drivers/net/vxlan.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * VXLAN: Virtual eXtensible Local Area Network
   4  *
   5  * Copyright (c) 2012-2013 Vyatta Inc.
   6  */
   7
   8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   9
  10 #include <linux/kernel.h>
  11 #include <linux/module.h>
  12 #include <linux/errno.h>
  13 #include <linux/slab.h>
  14 #include <linux/udp.h>
  15 #include <linux/igmp.h>
  16 #include <linux/if_ether.h>
  17 #include <linux/ethtool.h>
  18 #include <net/arp.h>
  19 #include <net/ndisc.h>
  20 #include <net/ipv6_stubs.h>
  21 #include <net/ip.h>
  22 #include <net/icmp.h>
  23 #include <net/rtnetlink.h>
  24 #include <net/inet_ecn.h>
  25 #include <net/net_namespace.h>
  26 #include <net/netns/generic.h>
  27 #include <net/tun_proto.h>
  28 #include <net/vxlan.h>
  29
  30 #if IS_ENABLED(CONFIG_IPV6)
  31 #include <net/ip6_tunnel.h>
  32 #include <net/ip6_checksum.h>
  33 #endif
  34
  35 #define VXLAN_VERSION   "0.1"
  36
  37 #define PORT_HASH_BITS  8
  38 #define PORT_HASH_SIZE  (1<<PORT_HASH_BITS)
  39 #define FDB_AGE_DEFAULT 300 /* 5 min */
  40 #define FDB_AGE_INTERVAL (10 * HZ)      /* rescan interval */
  41
  42 /* UDP port for VXLAN traffic.
  43  * The IANA assigned port is 4789, but the Linux default is 8472
  44  * for compatibility with early adopters.
  45  */
  46 static unsigned short vxlan_port __read_mostly = 8472;
  47 module_param_named(udp_port, vxlan_port, ushort, 0444);
  48 MODULE_PARM_DESC(udp_port, "Destination UDP port");
  49
  50 static bool log_ecn_error = true;
  51 module_param(log_ecn_error, bool, 0644);
  52 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
  53
  54 static unsigned int vxlan_net_id;
  55 static struct rtnl_link_ops vxlan_link_ops;
  56
  57 static const u8 all_zeros_mac[ETH_ALEN + 2];
  58
  59 static int vxlan_sock_add(struct vxlan_dev *vxlan);
  60
  61 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan);
  62
  63 /* per-network namespace private data for this module */
  64 struct vxlan_net {
  65         struct list_head  vxlan_list;
  66         struct hlist_head sock_list[PORT_HASH_SIZE];
  67         spinlock_t        sock_lock;
  68 };
  69
  70 /* Forwarding table entry */
  71 struct vxlan_fdb {
  72         struct hlist_node hlist;        /* linked list of entries */
  73         struct rcu_head   rcu;
  74         unsigned long     updated;      /* jiffies */
  75         unsigned long     used;
  76         struct list_head  remotes;
  77         u8                eth_addr[ETH_ALEN];
  78         u16               state;        /* see ndm_state */
  79         __be32            vni;
  80         u16               flags;        /* see ndm_flags and below */
  81 };
  82
  83 #define NTF_VXLAN_ADDED_BY_USER 0x100
  84
  85 /* salt for hash table */
  86 static u32 vxlan_salt __read_mostly;
  87
  88 static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
  89 {
  90         return vs->flags & VXLAN_F_COLLECT_METADATA ||
  91                ip_tunnel_collect_metadata();
  92 }
  93
  94 #if IS_ENABLED(CONFIG_IPV6)
  95 static inline
  96 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
  97 {
  98         if (a->sa.sa_family != b->sa.sa_family)
  99                 return false;
 100         if (a->sa.sa_family == AF_INET6)
 101                 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
 102         else
 103                 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
 104 }
 105
 106 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
 107 {
 108         if (nla_len(nla) >= sizeof(struct in6_addr)) {
 109                 ip->sin6.sin6_addr = nla_get_in6_addr(nla);
 110                 ip->sa.sa_family = AF_INET6;
 111                 return 0;
 112         } else if (nla_len(nla) >= sizeof(__be32)) {
 113                 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
 114                 ip->sa.sa_family = AF_INET;
 115                 return 0;
 116         } else {
 117                 return -EAFNOSUPPORT;
 118         }
 119 }
 120
 121 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
 122                               const union vxlan_addr *ip)
 123 {
 124         if (ip->sa.sa_family == AF_INET6)
 125                 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
 126         else
 127                 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
 128 }
 129
 130 #else /* !CONFIG_IPV6 */
 131
 132 static inline
 133 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
 134 {
 135         return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
 136 }
 137
 138 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
 139 {
 140         if (nla_len(nla) >= sizeof(struct in6_addr)) {
 141                 return -EAFNOSUPPORT;
 142         } else if (nla_len(nla) >= sizeof(__be32)) {
 143                 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
 144                 ip->sa.sa_family = AF_INET;
 145                 return 0;
 146         } else {
 147                 return -EAFNOSUPPORT;
 148         }
 149 }
 150
 151 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
 152                               const union vxlan_addr *ip)
 153 {
 154         return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
 155 }
 156 #endif
 157
 158 /* Virtual Network hash table head */
 159 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, __be32 vni)
 160 {
 161         return &vs->vni_list[hash_32((__force u32)vni, VNI_HASH_BITS)];
 162 }
 163
 164 /* Socket hash table head */
 165 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
 166 {
 167         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
 168
 169         return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
 170 }
 171
 172 /* First remote destination for a forwarding entry.
 173  * Guaranteed to be non-NULL because remotes are never deleted.
 174  */
 175 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
 176 {
 177         return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
 178 }
 179
 180 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
 181 {
 182         return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
 183 }
 184
 185 /* Find VXLAN socket based on network namespace, address family and UDP port
 186  * and enabled unshareable flags.
 187  */
 188 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
 189                                           __be16 port, u32 flags, int ifindex)
 190 {
 191         struct vxlan_sock *vs;
 192
 193         flags &= VXLAN_F_RCV_FLAGS;
 194
 195         hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
 196                 if (inet_sk(vs->sock->sk)->inet_sport == port &&
 197                     vxlan_get_sk_family(vs) == family &&
 198                     vs->flags == flags &&
 199                     vs->sock->sk->sk_bound_dev_if == ifindex)
 200                         return vs;
 201         }
 202         return NULL;
 203 }
 204
 205 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, int ifindex,
 206                                            __be32 vni)
 207 {
 208         struct vxlan_dev_node *node;
 209
 210         /* For flow based devices, map all packets to VNI 0 */
 211         if (vs->flags & VXLAN_F_COLLECT_METADATA)
 212                 vni = 0;
 213
 214         hlist_for_each_entry_rcu(node, vni_head(vs, vni), hlist) {
 215                 if (node->vxlan->default_dst.remote_vni != vni)
 216                         continue;
 217
 218                 if (IS_ENABLED(CONFIG_IPV6)) {
 219                         const struct vxlan_config *cfg = &node->vxlan->cfg;
 220
 221                         if ((cfg->flags & VXLAN_F_IPV6_LINKLOCAL) &&
 222                             cfg->remote_ifindex != ifindex)
 223                                 continue;
 224                 }
 225
 226                 return node->vxlan;
 227         }
 228
 229         return NULL;
 230 }
 231
 232 /* Look up VNI in a per net namespace table */
 233 static struct vxlan_dev *vxlan_find_vni(struct net *net, int ifindex,
 234                                         __be32 vni, sa_family_t family,
 235                                         __be16 port, u32 flags)
 236 {
 237         struct vxlan_sock *vs;
 238
 239         vs = vxlan_find_sock(net, family, port, flags, ifindex);
 240         if (!vs)
 241                 return NULL;
 242
 243         return vxlan_vs_find_vni(vs, ifindex, vni);
 244 }
 245
 246 /* Fill in neighbour message in skbuff. */
 247 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
 248                           const struct vxlan_fdb *fdb,
 249                           u32 portid, u32 seq, int type, unsigned int flags,
 250                           const struct vxlan_rdst *rdst)
 251 {
 252         unsigned long now = jiffies;
 253         struct nda_cacheinfo ci;
 254         struct nlmsghdr *nlh;
 255         struct ndmsg *ndm;
 256         bool send_ip, send_eth;
 257
 258         nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
 259         if (nlh == NULL)
 260                 return -EMSGSIZE;
 261
 262         ndm = nlmsg_data(nlh);
 263         memset(ndm, 0, sizeof(*ndm));
 264
 265         send_eth = send_ip = true;
 266
 267         if (type == RTM_GETNEIGH) {
 268                 send_ip = !vxlan_addr_any(&rdst->remote_ip);
 269                 send_eth = !is_zero_ether_addr(fdb->eth_addr);
 270                 ndm->ndm_family = send_ip ? rdst->remote_ip.sa.sa_family : AF_INET;
 271         } else
 272                 ndm->ndm_family = AF_BRIDGE;
 273         ndm->ndm_state = fdb->state;
 274         ndm->ndm_ifindex = vxlan->dev->ifindex;
 275         ndm->ndm_flags = fdb->flags;
 276         if (rdst->offloaded)
 277                 ndm->ndm_flags |= NTF_OFFLOADED;
 278         ndm->ndm_type = RTN_UNICAST;
 279
 280         if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
 281             nla_put_s32(skb, NDA_LINK_NETNSID,
 282                         peernet2id(dev_net(vxlan->dev), vxlan->net)))
 283                 goto nla_put_failure;
 284
 285         if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
 286                 goto nla_put_failure;
 287
 288         if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
 289                 goto nla_put_failure;
 290
 291         if (rdst->remote_port && rdst->remote_port != vxlan->cfg.dst_port &&
 292             nla_put_be16(skb, NDA_PORT, rdst->remote_port))
 293                 goto nla_put_failure;
 294         if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
 295             nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni)))
 296                 goto nla_put_failure;
 297         if ((vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) && fdb->vni &&
 298             nla_put_u32(skb, NDA_SRC_VNI,
 299                         be32_to_cpu(fdb->vni)))
 300                 goto nla_put_failure;
 301         if (rdst->remote_ifindex &&
 302             nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
 303                 goto nla_put_failure;
 304
 305         ci.ndm_used      = jiffies_to_clock_t(now - fdb->used);
 306         ci.ndm_confirmed = 0;
 307         ci.ndm_updated   = jiffies_to_clock_t(now - fdb->updated);
 308         ci.ndm_refcnt    = 0;
 309
 310         if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
 311                 goto nla_put_failure;
 312
 313         nlmsg_end(skb, nlh);
 314         return 0;
 315
 316 nla_put_failure:
 317         nlmsg_cancel(skb, nlh);
 318         return -EMSGSIZE;
 319 }
 320
 321 static inline size_t vxlan_nlmsg_size(void)
 322 {
 323         return NLMSG_ALIGN(sizeof(struct ndmsg))
 324                 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
 325                 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
 326                 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
 327                 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
 328                 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
 329                 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
 330                 + nla_total_size(sizeof(struct nda_cacheinfo));
 331 }
 332
 333 static void __vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
 334                                struct vxlan_rdst *rd, int type)
 335 {
 336         struct net *net = dev_net(vxlan->dev);
 337         struct sk_buff *skb;
 338         int err = -ENOBUFS;
 339
 340         skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
 341         if (skb == NULL)
 342                 goto errout;
 343
 344         err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
 345         if (err < 0) {
 346                 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
 347                 WARN_ON(err == -EMSGSIZE);
 348                 kfree_skb(skb);
 349                 goto errout;
 350         }
 351
 352         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
 353         return;
 354 errout:
 355         if (err < 0)
 356                 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
 357 }
 358
 359 static void vxlan_fdb_switchdev_notifier_info(const struct vxlan_dev *vxlan,
 360                             const struct vxlan_fdb *fdb,
 361                             const struct vxlan_rdst *rd,
 362                             struct netlink_ext_ack *extack,
 363                             struct switchdev_notifier_vxlan_fdb_info *fdb_info)
 364 {
 365         fdb_info->info.dev = vxlan->dev;
 366         fdb_info->info.extack = extack;
 367         fdb_info->remote_ip = rd->remote_ip;
 368         fdb_info->remote_port = rd->remote_port;
 369         fdb_info->remote_vni = rd->remote_vni;
 370         fdb_info->remote_ifindex = rd->remote_ifindex;
 371         memcpy(fdb_info->eth_addr, fdb->eth_addr, ETH_ALEN);
 372         fdb_info->vni = fdb->vni;
 373         fdb_info->offloaded = rd->offloaded;
 374         fdb_info->added_by_user = fdb->flags & NTF_VXLAN_ADDED_BY_USER;
 375 }
 376
 377 static int vxlan_fdb_switchdev_call_notifiers(struct vxlan_dev *vxlan,
 378                                               struct vxlan_fdb *fdb,
 379                                               struct vxlan_rdst *rd,
 380                                               bool adding,
 381                                               struct netlink_ext_ack *extack)
 382 {
 383         struct switchdev_notifier_vxlan_fdb_info info;
 384         enum switchdev_notifier_type notifier_type;
 385         int ret;
 386
 387         if (WARN_ON(!rd))
 388                 return 0;
 389
 390         notifier_type = adding ? SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE
 391                                : SWITCHDEV_VXLAN_FDB_DEL_TO_DEVICE;
 392         vxlan_fdb_switchdev_notifier_info(vxlan, fdb, rd, NULL, &info);
 393         ret = call_switchdev_notifiers(notifier_type, vxlan->dev,
 394                                        &info.info, extack);
 395         return notifier_to_errno(ret);
 396 }
 397
 398 static int vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
 399                             struct vxlan_rdst *rd, int type, bool swdev_notify,
 400                             struct netlink_ext_ack *extack)
 401 {
 402         int err;
 403
 404         if (swdev_notify) {
 405                 switch (type) {
 406                 case RTM_NEWNEIGH:
 407                         err = vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd,
 408                                                                  true, extack);
 409                         if (err)
 410                                 return err;
 411                         break;
 412                 case RTM_DELNEIGH:
 413                         vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd,
 414                                                            false, extack);
 415                         break;
 416                 }
 417         }
 418
 419         __vxlan_fdb_notify(vxlan, fdb, rd, type);
 420         return 0;
 421 }
 422
 423 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
 424 {
 425         struct vxlan_dev *vxlan = netdev_priv(dev);
 426         struct vxlan_fdb f = {
 427                 .state = NUD_STALE,
 428         };
 429         struct vxlan_rdst remote = {
 430                 .remote_ip = *ipa, /* goes to NDA_DST */
 431                 .remote_vni = cpu_to_be32(VXLAN_N_VID),
 432         };
 433
 434         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL);
 435 }
 436
 437 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
 438 {
 439         struct vxlan_fdb f = {
 440                 .state = NUD_STALE,
 441         };
 442         struct vxlan_rdst remote = { };
 443
 444         memcpy(f.eth_addr, eth_addr, ETH_ALEN);
 445
 446         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL);
 447 }
 448
 449 /* Hash Ethernet address */
 450 static u32 eth_hash(const unsigned char *addr)
 451 {
 452         u64 value = get_unaligned((u64 *)addr);
 453
 454         /* only want 6 bytes */
 455 #ifdef __BIG_ENDIAN
 456         value >>= 16;
 457 #else
 458         value <<= 16;
 459 #endif
 460         return hash_64(value, FDB_HASH_BITS);
 461 }
 462
 463 static u32 eth_vni_hash(const unsigned char *addr, __be32 vni)
 464 {
 465         /* use 1 byte of OUI and 3 bytes of NIC */
 466         u32 key = get_unaligned((u32 *)(addr + 2));
 467
 468         return jhash_2words(key, vni, vxlan_salt) & (FDB_HASH_SIZE - 1);
 469 }
 470
 471 static u32 fdb_head_index(struct vxlan_dev *vxlan, const u8 *mac, __be32 vni)
 472 {
 473         if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)
 474                 return eth_vni_hash(mac, vni);
 475         else
 476                 return eth_hash(mac);
 477 }
 478
 479 /* Hash chain to use given mac address */
 480 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
 481                                                 const u8 *mac, __be32 vni)
 482 {
 483         return &vxlan->fdb_head[fdb_head_index(vxlan, mac, vni)];
 484 }
 485
 486 /* Look up Ethernet address in forwarding table */
 487 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
 488                                           const u8 *mac, __be32 vni)
 489 {
 490         struct hlist_head *head = vxlan_fdb_head(vxlan, mac, vni);
 491         struct vxlan_fdb *f;
 492
 493         hlist_for_each_entry_rcu(f, head, hlist) {
 494                 if (ether_addr_equal(mac, f->eth_addr)) {
 495                         if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
 496                                 if (vni == f->vni)
 497                                         return f;
 498                         } else {
 499                                 return f;
 500                         }
 501                 }
 502         }
 503
 504         return NULL;
 505 }
 506
 507 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
 508                                         const u8 *mac, __be32 vni)
 509 {
 510         struct vxlan_fdb *f;
 511
 512         f = __vxlan_find_mac(vxlan, mac, vni);
 513         if (f && f->used != jiffies)
 514                 f->used = jiffies;
 515
 516         return f;
 517 }
 518
 519 /* caller should hold vxlan->hash_lock */
 520 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
 521                                               union vxlan_addr *ip, __be16 port,
 522                                               __be32 vni, __u32 ifindex)
 523 {
 524         struct vxlan_rdst *rd;
 525
 526         list_for_each_entry(rd, &f->remotes, list) {
 527                 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
 528                     rd->remote_port == port &&
 529                     rd->remote_vni == vni &&
 530                     rd->remote_ifindex == ifindex)
 531                         return rd;
 532         }
 533
 534         return NULL;
 535 }
 536
 537 int vxlan_fdb_find_uc(struct net_device *dev, const u8 *mac, __be32 vni,
 538                       struct switchdev_notifier_vxlan_fdb_info *fdb_info)
 539 {
 540         struct vxlan_dev *vxlan = netdev_priv(dev);
 541         u8 eth_addr[ETH_ALEN + 2] = { 0 };
 542         struct vxlan_rdst *rdst;
 543         struct vxlan_fdb *f;
 544         int rc = 0;
 545
 546         if (is_multicast_ether_addr(mac) ||
 547             is_zero_ether_addr(mac))
 548                 return -EINVAL;
 549
 550         ether_addr_copy(eth_addr, mac);
 551
 552         rcu_read_lock();
 553
 554         f = __vxlan_find_mac(vxlan, eth_addr, vni);
 555         if (!f) {
 556                 rc = -ENOENT;
 557                 goto out;
 558         }
 559
 560         rdst = first_remote_rcu(f);
 561         vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, NULL, fdb_info);
 562
 563 out:
 564         rcu_read_unlock();
 565         return rc;
 566 }
 567 EXPORT_SYMBOL_GPL(vxlan_fdb_find_uc);
 568
 569 static int vxlan_fdb_notify_one(struct notifier_block *nb,
 570                                 const struct vxlan_dev *vxlan,
 571                                 const struct vxlan_fdb *f,
 572                                 const struct vxlan_rdst *rdst,
 573                                 struct netlink_ext_ack *extack)
 574 {
 575         struct switchdev_notifier_vxlan_fdb_info fdb_info;
 576         int rc;
 577
 578         vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, extack, &fdb_info);
 579         rc = nb->notifier_call(nb, SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE,
 580                                &fdb_info);
 581         return notifier_to_errno(rc);
 582 }
 583
 584 int vxlan_fdb_replay(const struct net_device *dev, __be32 vni,
 585                      struct notifier_block *nb,
 586                      struct netlink_ext_ack *extack)
 587 {
 588         struct vxlan_dev *vxlan;
 589         struct vxlan_rdst *rdst;
 590         struct vxlan_fdb *f;
 591         unsigned int h;
 592         int rc = 0;
 593
 594         if (!netif_is_vxlan(dev))
 595                 return -EINVAL;
 596         vxlan = netdev_priv(dev);
 597
 598         for (h = 0; h < FDB_HASH_SIZE; ++h) {
 599                 spin_lock_bh(&vxlan->hash_lock[h]);
 600                 hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist) {
 601                         if (f->vni == vni) {
 602                                 list_for_each_entry(rdst, &f->remotes, list) {
 603                                         rc = vxlan_fdb_notify_one(nb, vxlan,
 604                                                                   f, rdst,
 605                                                                   extack);
 606                                         if (rc)
 607                                                 goto unlock;
 608                                 }
 609                         }
 610                 }
 611                 spin_unlock_bh(&vxlan->hash_lock[h]);
 612         }
 613         return 0;
 614
 615 unlock:
 616         spin_unlock_bh(&vxlan->hash_lock[h]);
 617         return rc;
 618 }
 619 EXPORT_SYMBOL_GPL(vxlan_fdb_replay);
 620
 621 void vxlan_fdb_clear_offload(const struct net_device *dev, __be32 vni)
 622 {
 623         struct vxlan_dev *vxlan;
 624         struct vxlan_rdst *rdst;
 625         struct vxlan_fdb *f;
 626         unsigned int h;
 627
 628         if (!netif_is_vxlan(dev))
 629                 return;
 630         vxlan = netdev_priv(dev);
 631
 632         for (h = 0; h < FDB_HASH_SIZE; ++h) {
 633                 spin_lock_bh(&vxlan->hash_lock[h]);
 634                 hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist)
 635                         if (f->vni == vni)
 636                                 list_for_each_entry(rdst, &f->remotes, list)
 637                                         rdst->offloaded = false;
 638                 spin_unlock_bh(&vxlan->hash_lock[h]);
 639         }
 640
 641 }
 642 EXPORT_SYMBOL_GPL(vxlan_fdb_clear_offload);
 643
 644 /* Replace destination of unicast mac */
 645 static int vxlan_fdb_replace(struct vxlan_fdb *f,
 646                              union vxlan_addr *ip, __be16 port, __be32 vni,
 647                              __u32 ifindex, struct vxlan_rdst *oldrd)
 648 {
 649         struct vxlan_rdst *rd;
 650
 651         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
 652         if (rd)
 653                 return 0;
 654
 655         rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
 656         if (!rd)
 657                 return 0;
 658
 659         *oldrd = *rd;
 660         dst_cache_reset(&rd->dst_cache);
 661         rd->remote_ip = *ip;
 662         rd->remote_port = port;
 663         rd->remote_vni = vni;
 664         rd->remote_ifindex = ifindex;
 665         rd->offloaded = false;
 666         return 1;
 667 }
 668
 669 /* Add/update destinations for multicast */
 670 static int vxlan_fdb_append(struct vxlan_fdb *f,
 671                             union vxlan_addr *ip, __be16 port, __be32 vni,
 672                             __u32 ifindex, struct vxlan_rdst **rdp)
 673 {
 674         struct vxlan_rdst *rd;
 675
 676         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
 677         if (rd)
 678                 return 0;
 679
 680         rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
 681         if (rd == NULL)
 682                 return -ENOBUFS;
 683
 684         if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) {
 685                 kfree(rd);
 686                 return -ENOBUFS;
 687         }
 688
 689         rd->remote_ip = *ip;
 690         rd->remote_port = port;
 691         rd->offloaded = false;
 692         rd->remote_vni = vni;
 693         rd->remote_ifindex = ifindex;
 694
 695         list_add_tail_rcu(&rd->list, &f->remotes);
 696
 697         *rdp = rd;
 698         return 1;
 699 }
 700
 701 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
 702                                           unsigned int off,
 703                                           struct vxlanhdr *vh, size_t hdrlen,
 704                                           __be32 vni_field,
 705                                           struct gro_remcsum *grc,
 706                                           bool nopartial)
 707 {
 708         size_t start, offset;
 709
 710         if (skb->remcsum_offload)
 711                 return vh;
 712
 713         if (!NAPI_GRO_CB(skb)->csum_valid)
 714                 return NULL;
 715
 716         start = vxlan_rco_start(vni_field);
 717         offset = start + vxlan_rco_offset(vni_field);
 718
 719         vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
 720                                      start, offset, grc, nopartial);
 721
 722         skb->remcsum_offload = 1;
 723
 724         return vh;
 725 }
 726
 727 static struct sk_buff *vxlan_gro_receive(struct sock *sk,
 728                                          struct list_head *head,
 729                                          struct sk_buff *skb)
 730 {
 731         struct sk_buff *pp = NULL;
 732         struct sk_buff *p;
 733         struct vxlanhdr *vh, *vh2;
 734         unsigned int hlen, off_vx;
 735         int flush = 1;
 736         struct vxlan_sock *vs = rcu_dereference_sk_user_data(sk);
 737         __be32 flags;
 738         struct gro_remcsum grc;
 739
 740         skb_gro_remcsum_init(&grc);
 741
 742         off_vx = skb_gro_offset(skb);
 743         hlen = off_vx + sizeof(*vh);
 744         vh   = skb_gro_header_fast(skb, off_vx);
 745         if (skb_gro_header_hard(skb, hlen)) {
 746                 vh = skb_gro_header_slow(skb, hlen, off_vx);
 747                 if (unlikely(!vh))
 748                         goto out;
 749         }
 750
 751         skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
 752
 753         flags = vh->vx_flags;
 754
 755         if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
 756                 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
 757                                        vh->vx_vni, &grc,
 758                                        !!(vs->flags &
 759                                           VXLAN_F_REMCSUM_NOPARTIAL));
 760
 761                 if (!vh)
 762                         goto out;
 763         }
 764
 765         skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
 766
 767         list_for_each_entry(p, head, list) {
 768                 if (!NAPI_GRO_CB(p)->same_flow)
 769                         continue;
 770
 771                 vh2 = (struct vxlanhdr *)(p->data + off_vx);
 772                 if (vh->vx_flags != vh2->vx_flags ||
 773                     vh->vx_vni != vh2->vx_vni) {
 774                         NAPI_GRO_CB(p)->same_flow = 0;
 775                         continue;
 776                 }
 777         }
 778
 779         pp = call_gro_receive(eth_gro_receive, head, skb);
 780         flush = 0;
 781
 782 out:
 783         skb_gro_flush_final_remcsum(skb, pp, flush, &grc);
 784
 785         return pp;
 786 }
 787
 788 static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
 789 {
 790         /* Sets 'skb->inner_mac_header' since we are always called with
 791          * 'skb->encapsulation' set.
 792          */
 793         return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
 794 }
 795
 796 static struct vxlan_fdb *vxlan_fdb_alloc(const u8 *mac, __u16 state,
 797                                          __be32 src_vni, __u16 ndm_flags)
 798 {
 799         struct vxlan_fdb *f;
 800
 801         f = kmalloc(sizeof(*f), GFP_ATOMIC);
 802         if (!f)
 803                 return NULL;
 804         f->state = state;
 805         f->flags = ndm_flags;
 806         f->updated = f->used = jiffies;
 807         f->vni = src_vni;
 808         INIT_LIST_HEAD(&f->remotes);
 809         memcpy(f->eth_addr, mac, ETH_ALEN);
 810
 811         return f;
 812 }
 813
 814 static void vxlan_fdb_insert(struct vxlan_dev *vxlan, const u8 *mac,
 815                              __be32 src_vni, struct vxlan_fdb *f)
 816 {
 817         ++vxlan->addrcnt;
 818         hlist_add_head_rcu(&f->hlist,
 819                            vxlan_fdb_head(vxlan, mac, src_vni));
 820 }
 821
 822 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
 823                             const u8 *mac, union vxlan_addr *ip,
 824                             __u16 state, __be16 port, __be32 src_vni,
 825                             __be32 vni, __u32 ifindex, __u16 ndm_flags,
 826                             struct vxlan_fdb **fdb)
 827 {
 828         struct vxlan_rdst *rd = NULL;
 829         struct vxlan_fdb *f;
 830         int rc;
 831
 832         if (vxlan->cfg.addrmax &&
 833             vxlan->addrcnt >= vxlan->cfg.addrmax)
 834                 return -ENOSPC;
 835
 836         netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
 837         f = vxlan_fdb_alloc(mac, state, src_vni, ndm_flags);
 838         if (!f)
 839                 return -ENOMEM;
 840
 841         rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
 842         if (rc < 0) {
 843                 kfree(f);
 844                 return rc;
 845         }
 846
 847         *fdb = f;
 848
 849         return 0;
 850 }
 851
 852 static void __vxlan_fdb_free(struct vxlan_fdb *f)
 853 {
 854         struct vxlan_rdst *rd, *nd;
 855
 856         list_for_each_entry_safe(rd, nd, &f->remotes, list) {
 857                 dst_cache_destroy(&rd->dst_cache);
 858                 kfree(rd);
 859         }
 860         kfree(f);
 861 }
 862
 863 static void vxlan_fdb_free(struct rcu_head *head)
 864 {
 865         struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
 866
 867         __vxlan_fdb_free(f);
 868 }
 869
 870 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
 871                               bool do_notify, bool swdev_notify)
 872 {
 873         struct vxlan_rdst *rd;
 874
 875         netdev_dbg(vxlan->dev, "delete %pM\n", f->eth_addr);
 876
 877         --vxlan->addrcnt;
 878         if (do_notify)
 879                 list_for_each_entry(rd, &f->remotes, list)
 880                         vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH,
 881                                          swdev_notify, NULL);
 882
 883         hlist_del_rcu(&f->hlist);
 884         call_rcu(&f->rcu, vxlan_fdb_free);
 885 }
 886
 887 static void vxlan_dst_free(struct rcu_head *head)
 888 {
 889         struct vxlan_rdst *rd = container_of(head, struct vxlan_rdst, rcu);
 890
 891         dst_cache_destroy(&rd->dst_cache);
 892         kfree(rd);
 893 }
 894
 895 static int vxlan_fdb_update_existing(struct vxlan_dev *vxlan,
 896                                      union vxlan_addr *ip,
 897                                      __u16 state, __u16 flags,
 898                                      __be16 port, __be32 vni,
 899                                      __u32 ifindex, __u16 ndm_flags,
 900                                      struct vxlan_fdb *f,
 901                                      bool swdev_notify,
 902                                      struct netlink_ext_ack *extack)
 903 {
 904         __u16 fdb_flags = (ndm_flags & ~NTF_USE);
 905         struct vxlan_rdst *rd = NULL;
 906         struct vxlan_rdst oldrd;
 907         int notify = 0;
 908         int rc = 0;
 909         int err;
 910
 911         /* Do not allow an externally learned entry to take over an entry added
 912          * by the user.
 913          */
 914         if (!(fdb_flags & NTF_EXT_LEARNED) ||
 915             !(f->flags & NTF_VXLAN_ADDED_BY_USER)) {
 916                 if (f->state != state) {
 917                         f->state = state;
 918                         f->updated = jiffies;
 919                         notify = 1;
 920                 }
 921                 if (f->flags != fdb_flags) {
 922                         f->flags = fdb_flags;
 923                         f->updated = jiffies;
 924                         notify = 1;
 925                 }
 926         }
 927
 928         if ((flags & NLM_F_REPLACE)) {
 929                 /* Only change unicasts */
 930                 if (!(is_multicast_ether_addr(f->eth_addr) ||
 931                       is_zero_ether_addr(f->eth_addr))) {
 932                         rc = vxlan_fdb_replace(f, ip, port, vni,
 933                                                ifindex, &oldrd);
 934                         notify |= rc;
 935                 } else {
 936                         return -EOPNOTSUPP;
 937                 }
 938         }
 939         if ((flags & NLM_F_APPEND) &&
 940             (is_multicast_ether_addr(f->eth_addr) ||
 941              is_zero_ether_addr(f->eth_addr))) {
 942                 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
 943
 944                 if (rc < 0)
 945                         return rc;
 946                 notify |= rc;
 947         }
 948
 949         if (ndm_flags & NTF_USE)
 950                 f->used = jiffies;
 951
 952         if (notify) {
 953                 if (rd == NULL)
 954                         rd = first_remote_rtnl(f);
 955
 956                 err = vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH,
 957                                        swdev_notify, extack);
 958                 if (err)
 959                         goto err_notify;
 960         }
 961
 962         return 0;
 963
 964 err_notify:
 965         if ((flags & NLM_F_REPLACE) && rc)
 966                 *rd = oldrd;
 967         else if ((flags & NLM_F_APPEND) && rc) {
 968                 list_del_rcu(&rd->list);
 969                 call_rcu(&rd->rcu, vxlan_dst_free);
 970         }
 971         return err;
 972 }
 973
 974 static int vxlan_fdb_update_create(struct vxlan_dev *vxlan,
 975                                    const u8 *mac, union vxlan_addr *ip,
 976                                    __u16 state, __u16 flags,
 977                                    __be16 port, __be32 src_vni, __be32 vni,
 978                                    __u32 ifindex, __u16 ndm_flags,
 979                                    bool swdev_notify,
 980                                    struct netlink_ext_ack *extack)
 981 {
 982         __u16 fdb_flags = (ndm_flags & ~NTF_USE);
 983         struct vxlan_fdb *f;
 984         int rc;
 985
 986         /* Disallow replace to add a multicast entry */
 987         if ((flags & NLM_F_REPLACE) &&
 988             (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
 989                 return -EOPNOTSUPP;
 990
 991         netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
 992         rc = vxlan_fdb_create(vxlan, mac, ip, state, port, src_vni,
 993                               vni, ifindex, fdb_flags, &f);
 994         if (rc < 0)
 995                 return rc;
 996
 997         vxlan_fdb_insert(vxlan, mac, src_vni, f);
 998         rc = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_NEWNEIGH,
 999                               swdev_notify, extack);
1000         if (rc)
1001                 goto err_notify;
1002
1003         return 0;
1004
1005 err_notify:
1006         vxlan_fdb_destroy(vxlan, f, false, false);
1007         return rc;
1008 }
1009
1010 /* Add new entry to forwarding table -- assumes lock held */
1011 static int vxlan_fdb_update(struct vxlan_dev *vxlan,
1012                             const u8 *mac, union vxlan_addr *ip,
1013                             __u16 state, __u16 flags,
1014                             __be16 port, __be32 src_vni, __be32 vni,
1015                             __u32 ifindex, __u16 ndm_flags,
1016                             bool swdev_notify,
1017                             struct netlink_ext_ack *extack)
1018 {
1019         struct vxlan_fdb *f;
1020
1021         f = __vxlan_find_mac(vxlan, mac, src_vni);
1022         if (f) {
1023                 if (flags & NLM_F_EXCL) {
1024                         netdev_dbg(vxlan->dev,
1025                                    "lost race to create %pM\n", mac);
1026                         return -EEXIST;
1027                 }
1028
1029                 return vxlan_fdb_update_existing(vxlan, ip, state, flags, port,
1030                                                  vni, ifindex, ndm_flags, f,
1031                                                  swdev_notify, extack);
1032         } else {
1033                 if (!(flags & NLM_F_CREATE))
1034                         return -ENOENT;
1035
1036                 return vxlan_fdb_update_create(vxlan, mac, ip, state, flags,
1037                                                port, src_vni, vni, ifindex,
1038                                                ndm_flags, swdev_notify, extack);
1039         }
1040 }
1041
1042 static void vxlan_fdb_dst_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
1043                                   struct vxlan_rdst *rd, bool swdev_notify)
1044 {
1045         list_del_rcu(&rd->list);
1046         vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH, swdev_notify, NULL);
1047         call_rcu(&rd->rcu, vxlan_dst_free);
1048 }
1049
1050 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
1051                            union vxlan_addr *ip, __be16 *port, __be32 *src_vni,
1052                            __be32 *vni, u32 *ifindex)
1053 {
1054         struct net *net = dev_net(vxlan->dev);
1055         int err;
1056
1057         if (tb[NDA_DST]) {
1058                 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
1059                 if (err)
1060                         return err;
1061         } else {
1062                 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
1063                 if (remote->sa.sa_family == AF_INET) {
1064                         ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
1065                         ip->sa.sa_family = AF_INET;
1066 #if IS_ENABLED(CONFIG_IPV6)
1067                 } else {
1068                         ip->sin6.sin6_addr = in6addr_any;
1069                         ip->sa.sa_family = AF_INET6;
1070 #endif
1071                 }
1072         }
1073
1074         if (tb[NDA_PORT]) {
1075                 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
1076                         return -EINVAL;
1077                 *port = nla_get_be16(tb[NDA_PORT]);
1078         } else {
1079                 *port = vxlan->cfg.dst_port;
1080         }
1081
1082         if (tb[NDA_VNI]) {
1083                 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
1084                         return -EINVAL;
1085                 *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
1086         } else {
1087                 *vni = vxlan->default_dst.remote_vni;
1088         }
1089
1090         if (tb[NDA_SRC_VNI]) {
1091                 if (nla_len(tb[NDA_SRC_VNI]) != sizeof(u32))
1092                         return -EINVAL;
1093                 *src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI]));
1094         } else {
1095                 *src_vni = vxlan->default_dst.remote_vni;
1096         }
1097
1098         if (tb[NDA_IFINDEX]) {
1099                 struct net_device *tdev;
1100
1101                 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
1102                         return -EINVAL;
1103                 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
1104                 tdev = __dev_get_by_index(net, *ifindex);
1105                 if (!tdev)
1106                         return -EADDRNOTAVAIL;
1107         } else {
1108                 *ifindex = 0;
1109         }
1110
1111         return 0;
1112 }
1113
1114 /* Add static entry (via netlink) */
1115 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
1116                          struct net_device *dev,
1117                          const unsigned char *addr, u16 vid, u16 flags,
1118                          struct netlink_ext_ack *extack)
1119 {
1120         struct vxlan_dev *vxlan = netdev_priv(dev);
1121         /* struct net *net = dev_net(vxlan->dev); */
1122         union vxlan_addr ip;
1123         __be16 port;
1124         __be32 src_vni, vni;
1125         u32 ifindex;
1126         u32 hash_index;
1127         int err;
1128
1129         if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
1130                 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
1131                         ndm->ndm_state);
1132                 return -EINVAL;
1133         }
1134
1135         if (tb[NDA_DST] == NULL)
1136                 return -EINVAL;
1137
1138         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex);
1139         if (err)
1140                 return err;
1141
1142         if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
1143                 return -EAFNOSUPPORT;
1144
1145         hash_index = fdb_head_index(vxlan, addr, src_vni);
1146         spin_lock_bh(&vxlan->hash_lock[hash_index]);
1147         err = vxlan_fdb_update(vxlan, addr, &ip, ndm->ndm_state, flags,
1148                                port, src_vni, vni, ifindex,
1149                                ndm->ndm_flags | NTF_VXLAN_ADDED_BY_USER,
1150                                true, extack);
1151         spin_unlock_bh(&vxlan->hash_lock[hash_index]);
1152
1153         return err;
1154 }
1155
1156 static int __vxlan_fdb_delete(struct vxlan_dev *vxlan,
1157                               const unsigned char *addr, union vxlan_addr ip,
1158                               __be16 port, __be32 src_vni, __be32 vni,
1159                               u32 ifindex, bool swdev_notify)
1160 {
1161         struct vxlan_fdb *f;
1162         struct vxlan_rdst *rd = NULL;
1163         int err = -ENOENT;
1164
1165         f = vxlan_find_mac(vxlan, addr, src_vni);
1166         if (!f)
1167                 return err;
1168
1169         if (!vxlan_addr_any(&ip)) {
1170                 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
1171                 if (!rd)
1172                         goto out;
1173         }
1174
1175         /* remove a destination if it's not the only one on the list,
1176          * otherwise destroy the fdb entry
1177          */
1178         if (rd && !list_is_singular(&f->remotes)) {
1179                 vxlan_fdb_dst_destroy(vxlan, f, rd, swdev_notify);
1180                 goto out;
1181         }
1182
1183         vxlan_fdb_destroy(vxlan, f, true, swdev_notify);
1184
1185 out:
1186         return 0;
1187 }
1188
1189 /* Delete entry (via netlink) */
1190 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
1191                             struct net_device *dev,
1192                             const unsigned char *addr, u16 vid)
1193 {
1194         struct vxlan_dev *vxlan = netdev_priv(dev);
1195         union vxlan_addr ip;
1196         __be32 src_vni, vni;
1197         __be16 port;
1198         u32 ifindex;
1199         u32 hash_index;
1200         int err;
1201
1202         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex);
1203         if (err)
1204                 return err;
1205
1206         hash_index = fdb_head_index(vxlan, addr, src_vni);
1207         spin_lock_bh(&vxlan->hash_lock[hash_index]);
1208         err = __vxlan_fdb_delete(vxlan, addr, ip, port, src_vni, vni, ifindex,
1209                                  true);
1210         spin_unlock_bh(&vxlan->hash_lock[hash_index]);
1211
1212         return err;
1213 }
1214
1215 /* Dump forwarding table */
1216 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
1217                           struct net_device *dev,
1218                           struct net_device *filter_dev, int *idx)
1219 {
1220         struct vxlan_dev *vxlan = netdev_priv(dev);
1221         unsigned int h;
1222         int err = 0;
1223
1224         for (h = 0; h < FDB_HASH_SIZE; ++h) {
1225                 struct vxlan_fdb *f;
1226
1227                 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
1228                         struct vxlan_rdst *rd;
1229
1230                         list_for_each_entry_rcu(rd, &f->remotes, list) {
1231                                 if (*idx < cb->args[2])
1232                                         goto skip;
1233
1234                                 err = vxlan_fdb_info(skb, vxlan, f,
1235                                                      NETLINK_CB(cb->skb).portid,
1236                                                      cb->nlh->nlmsg_seq,
1237                                                      RTM_NEWNEIGH,
1238                                                      NLM_F_MULTI, rd);
1239                                 if (err < 0)
1240                                         goto out;
1241 skip:
1242                                 *idx += 1;
1243                         }
1244                 }
1245         }
1246 out:
1247         return err;
1248 }
1249
1250 static int vxlan_fdb_get(struct sk_buff *skb,
1251                          struct nlattr *tb[],
1252                          struct net_device *dev,
1253                          const unsigned char *addr,
1254                          u16 vid, u32 portid, u32 seq,
1255                          struct netlink_ext_ack *extack)
1256 {
1257         struct vxlan_dev *vxlan = netdev_priv(dev);
1258         struct vxlan_fdb *f;
1259         __be32 vni;
1260         int err;
1261
1262         if (tb[NDA_VNI])
1263                 vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
1264         else
1265                 vni = vxlan->default_dst.remote_vni;
1266
1267         rcu_read_lock();
1268
1269         f = __vxlan_find_mac(vxlan, addr, vni);
1270         if (!f) {
1271                 NL_SET_ERR_MSG(extack, "Fdb entry not found");
1272                 err = -ENOENT;
1273                 goto errout;
1274         }
1275
1276         err = vxlan_fdb_info(skb, vxlan, f, portid, seq,
1277                              RTM_NEWNEIGH, 0, first_remote_rcu(f));
1278 errout:
1279         rcu_read_unlock();
1280         return err;
1281 }
1282
1283 /* Watch incoming packets to learn mapping between Ethernet address
1284  * and Tunnel endpoint.
1285  * Return true if packet is bogus and should be dropped.
1286  */
1287 static bool vxlan_snoop(struct net_device *dev,
1288                         union vxlan_addr *src_ip, const u8 *src_mac,
1289                         u32 src_ifindex, __be32 vni)
1290 {
1291         struct vxlan_dev *vxlan = netdev_priv(dev);
1292         struct vxlan_fdb *f;
1293         u32 ifindex = 0;
1294
1295 #if IS_ENABLED(CONFIG_IPV6)
1296         if (src_ip->sa.sa_family == AF_INET6 &&
1297             (ipv6_addr_type(&src_ip->sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL))
1298                 ifindex = src_ifindex;
1299 #endif
1300
1301         f = vxlan_find_mac(vxlan, src_mac, vni);
1302         if (likely(f)) {
1303                 struct vxlan_rdst *rdst = first_remote_rcu(f);
1304
1305                 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip) &&
1306                            rdst->remote_ifindex == ifindex))
1307                         return false;
1308
1309                 /* Don't migrate static entries, drop packets */
1310                 if (f->state & (NUD_PERMANENT | NUD_NOARP))
1311                         return true;
1312
1313                 if (net_ratelimit())
1314                         netdev_info(dev,
1315                                     "%pM migrated from %pIS to %pIS\n",
1316                                     src_mac, &rdst->remote_ip.sa, &src_ip->sa);
1317
1318                 rdst->remote_ip = *src_ip;
1319                 f->updated = jiffies;
1320                 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH, true, NULL);
1321         } else {
1322                 u32 hash_index = fdb_head_index(vxlan, src_mac, vni);
1323
1324                 /* learned new entry */
1325                 spin_lock(&vxlan->hash_lock[hash_index]);
1326
1327                 /* close off race between vxlan_flush and incoming packets */
1328                 if (netif_running(dev))
1329                         vxlan_fdb_update(vxlan, src_mac, src_ip,
1330                                          NUD_REACHABLE,
1331                                          NLM_F_EXCL|NLM_F_CREATE,
1332                                          vxlan->cfg.dst_port,
1333                                          vni,
1334                                          vxlan->default_dst.remote_vni,
1335                                          ifindex, NTF_SELF, true, NULL);
1336                 spin_unlock(&vxlan->hash_lock[hash_index]);
1337         }
1338
1339         return false;
1340 }
1341
1342 /* See if multicast group is already in use by other ID */
1343 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
1344 {
1345         struct vxlan_dev *vxlan;
1346         struct vxlan_sock *sock4;
1347 #if IS_ENABLED(CONFIG_IPV6)
1348         struct vxlan_sock *sock6;
1349 #endif
1350         unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
1351
1352         sock4 = rtnl_dereference(dev->vn4_sock);
1353
1354         /* The vxlan_sock is only used by dev, leaving group has
1355          * no effect on other vxlan devices.
1356          */
1357         if (family == AF_INET && sock4 && refcount_read(&sock4->refcnt) == 1)
1358                 return false;
1359 #if IS_ENABLED(CONFIG_IPV6)
1360         sock6 = rtnl_dereference(dev->vn6_sock);
1361         if (family == AF_INET6 && sock6 && refcount_read(&sock6->refcnt) == 1)
1362                 return false;
1363 #endif
1364
1365         list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1366                 if (!netif_running(vxlan->dev) || vxlan == dev)
1367                         continue;
1368
1369                 if (family == AF_INET &&
1370                     rtnl_dereference(vxlan->vn4_sock) != sock4)
1371                         continue;
1372 #if IS_ENABLED(CONFIG_IPV6)
1373                 if (family == AF_INET6 &&
1374                     rtnl_dereference(vxlan->vn6_sock) != sock6)
1375                         continue;
1376 #endif
1377
1378                 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1379                                       &dev->default_dst.remote_ip))
1380                         continue;
1381
1382                 if (vxlan->default_dst.remote_ifindex !=
1383                     dev->default_dst.remote_ifindex)
1384                         continue;
1385
1386                 return true;
1387         }
1388
1389         return false;
1390 }
1391
1392 static bool __vxlan_sock_release_prep(struct vxlan_sock *vs)
1393 {
1394         struct vxlan_net *vn;
1395
1396         if (!vs)
1397                 return false;
1398         if (!refcount_dec_and_test(&vs->refcnt))
1399                 return false;
1400
1401         vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1402         spin_lock(&vn->sock_lock);
1403         hlist_del_rcu(&vs->hlist);
1404         udp_tunnel_notify_del_rx_port(vs->sock,
1405                                       (vs->flags & VXLAN_F_GPE) ?
1406                                       UDP_TUNNEL_TYPE_VXLAN_GPE :
1407                                       UDP_TUNNEL_TYPE_VXLAN);
1408         spin_unlock(&vn->sock_lock);
1409
1410         return true;
1411 }
1412
1413 static void vxlan_sock_release(struct vxlan_dev *vxlan)
1414 {
1415         struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1416 #if IS_ENABLED(CONFIG_IPV6)
1417         struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1418
1419         RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
1420 #endif
1421
1422         RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
1423         synchronize_net();
1424
1425         vxlan_vs_del_dev(vxlan);
1426
1427         if (__vxlan_sock_release_prep(sock4)) {
1428                 udp_tunnel_sock_release(sock4->sock);
1429                 kfree(sock4);
1430         }
1431
1432 #if IS_ENABLED(CONFIG_IPV6)
1433         if (__vxlan_sock_release_prep(sock6)) {
1434                 udp_tunnel_sock_release(sock6->sock);
1435                 kfree(sock6);
1436         }
1437 #endif
1438 }
1439
1440 /* Update multicast group membership when first VNI on
1441  * multicast address is brought up
1442  */
1443 static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1444 {
1445         struct sock *sk;
1446         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1447         int ifindex = vxlan->default_dst.remote_ifindex;
1448         int ret = -EINVAL;
1449
1450         if (ip->sa.sa_family == AF_INET) {
1451                 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1452                 struct ip_mreqn mreq = {
1453                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1454                         .imr_ifindex            = ifindex,
1455                 };
1456
1457                 sk = sock4->sock->sk;
1458                 lock_sock(sk);
1459                 ret = ip_mc_join_group(sk, &mreq);
1460                 release_sock(sk);
1461 #if IS_ENABLED(CONFIG_IPV6)
1462         } else {
1463                 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1464
1465                 sk = sock6->sock->sk;
1466                 lock_sock(sk);
1467                 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1468                                                    &ip->sin6.sin6_addr);
1469                 release_sock(sk);
1470 #endif
1471         }
1472
1473         return ret;
1474 }
1475
1476 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1477 static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1478 {
1479         struct sock *sk;
1480         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1481         int ifindex = vxlan->default_dst.remote_ifindex;
1482         int ret = -EINVAL;
1483
1484         if (ip->sa.sa_family == AF_INET) {
1485                 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1486                 struct ip_mreqn mreq = {
1487                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1488                         .imr_ifindex            = ifindex,
1489                 };
1490
1491                 sk = sock4->sock->sk;
1492                 lock_sock(sk);
1493                 ret = ip_mc_leave_group(sk, &mreq);
1494                 release_sock(sk);
1495 #if IS_ENABLED(CONFIG_IPV6)
1496         } else {
1497                 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1498
1499                 sk = sock6->sock->sk;
1500                 lock_sock(sk);
1501                 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1502                                                    &ip->sin6.sin6_addr);
1503                 release_sock(sk);
1504 #endif
1505         }
1506
1507         return ret;
1508 }
1509
1510 static bool vxlan_remcsum(struct vxlanhdr *unparsed,
1511                           struct sk_buff *skb, u32 vxflags)
1512 {
1513         size_t start, offset;
1514
1515         if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
1516                 goto out;
1517
1518         start = vxlan_rco_start(unparsed->vx_vni);
1519         offset = start + vxlan_rco_offset(unparsed->vx_vni);
1520
1521         if (!pskb_may_pull(skb, offset + sizeof(u16)))
1522                 return false;
1523
1524         skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
1525                             !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL));
1526 out:
1527         unparsed->vx_flags &= ~VXLAN_HF_RCO;
1528         unparsed->vx_vni &= VXLAN_VNI_MASK;
1529         return true;
1530 }
1531
1532 static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
1533                                 struct sk_buff *skb, u32 vxflags,
1534                                 struct vxlan_metadata *md)
1535 {
1536         struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
1537         struct metadata_dst *tun_dst;
1538
1539         if (!(unparsed->vx_flags & VXLAN_HF_GBP))
1540                 goto out;
1541
1542         md->gbp = ntohs(gbp->policy_id);
1543
1544         tun_dst = (struct metadata_dst *)skb_dst(skb);
1545         if (tun_dst) {
1546                 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1547                 tun_dst->u.tun_info.options_len = sizeof(*md);
1548         }
1549         if (gbp->dont_learn)
1550                 md->gbp |= VXLAN_GBP_DONT_LEARN;
1551
1552         if (gbp->policy_applied)
1553                 md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1554
1555         /* In flow-based mode, GBP is carried in dst_metadata */
1556         if (!(vxflags & VXLAN_F_COLLECT_METADATA))
1557                 skb->mark = md->gbp;
1558 out:
1559         unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
1560 }
1561
1562 static bool vxlan_parse_gpe_hdr(struct vxlanhdr *unparsed,
1563                                 __be16 *protocol,
1564                                 struct sk_buff *skb, u32 vxflags)
1565 {
1566         struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)unparsed;
1567
1568         /* Need to have Next Protocol set for interfaces in GPE mode. */
1569         if (!gpe->np_applied)
1570                 return false;
1571         /* "The initial version is 0. If a receiver does not support the
1572          * version indicated it MUST drop the packet.
1573          */
1574         if (gpe->version != 0)
1575                 return false;
1576         /* "When the O bit is set to 1, the packet is an OAM packet and OAM
1577          * processing MUST occur." However, we don't implement OAM
1578          * processing, thus drop the packet.
1579          */
1580         if (gpe->oam_flag)
1581                 return false;
1582
1583         *protocol = tun_p_to_eth_p(gpe->next_protocol);
1584         if (!*protocol)
1585                 return false;
1586
1587         unparsed->vx_flags &= ~VXLAN_GPE_USED_BITS;
1588         return true;
1589 }
1590
1591 static bool vxlan_set_mac(struct vxlan_dev *vxlan,
1592                           struct vxlan_sock *vs,
1593                           struct sk_buff *skb, __be32 vni)
1594 {
1595         union vxlan_addr saddr;
1596         u32 ifindex = skb->dev->ifindex;
1597
1598         skb_reset_mac_header(skb);
1599         skb->protocol = eth_type_trans(skb, vxlan->dev);
1600         skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1601
1602         /* Ignore packet loops (and multicast echo) */
1603         if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1604                 return false;
1605
1606         /* Get address from the outer IP header */
1607         if (vxlan_get_sk_family(vs) == AF_INET) {
1608                 saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
1609                 saddr.sa.sa_family = AF_INET;
1610 #if IS_ENABLED(CONFIG_IPV6)
1611         } else {
1612                 saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
1613                 saddr.sa.sa_family = AF_INET6;
1614 #endif
1615         }
1616
1617         if ((vxlan->cfg.flags & VXLAN_F_LEARN) &&
1618             vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source, ifindex, vni))
1619                 return false;
1620
1621         return true;
1622 }
1623
1624 static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph,
1625                                   struct sk_buff *skb)
1626 {
1627         int err = 0;
1628
1629         if (vxlan_get_sk_family(vs) == AF_INET)
1630                 err = IP_ECN_decapsulate(oiph, skb);
1631 #if IS_ENABLED(CONFIG_IPV6)
1632         else
1633                 err = IP6_ECN_decapsulate(oiph, skb);
1634 #endif
1635
1636         if (unlikely(err) && log_ecn_error) {
1637                 if (vxlan_get_sk_family(vs) == AF_INET)
1638                         net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1639                                              &((struct iphdr *)oiph)->saddr,
1640                                              ((struct iphdr *)oiph)->tos);
1641                 else
1642                         net_info_ratelimited("non-ECT from %pI6\n",
1643                                              &((struct ipv6hdr *)oiph)->saddr);
1644         }
1645         return err <= 1;
1646 }
1647
1648 /* Callback from net/ipv4/udp.c to receive packets */
1649 static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
1650 {
1651         struct pcpu_sw_netstats *stats;
1652         struct vxlan_dev *vxlan;
1653         struct vxlan_sock *vs;
1654         struct vxlanhdr unparsed;
1655         struct vxlan_metadata _md;
1656         struct vxlan_metadata *md = &_md;
1657         __be16 protocol = htons(ETH_P_TEB);
1658         bool raw_proto = false;
1659         void *oiph;
1660         __be32 vni = 0;
1661
1662         /* Need UDP and VXLAN header to be present */
1663         if (!pskb_may_pull(skb, VXLAN_HLEN))
1664                 goto drop;
1665
1666         unparsed = *vxlan_hdr(skb);
1667         /* VNI flag always required to be set */
1668         if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
1669                 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1670                            ntohl(vxlan_hdr(skb)->vx_flags),
1671                            ntohl(vxlan_hdr(skb)->vx_vni));
1672                 /* Return non vxlan pkt */
1673                 goto drop;
1674         }
1675         unparsed.vx_flags &= ~VXLAN_HF_VNI;
1676         unparsed.vx_vni &= ~VXLAN_VNI_MASK;
1677
1678         vs = rcu_dereference_sk_user_data(sk);
1679         if (!vs)
1680                 goto drop;
1681
1682         vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
1683
1684         vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni);
1685         if (!vxlan)
1686                 goto drop;
1687
1688         /* For backwards compatibility, only allow reserved fields to be
1689          * used by VXLAN extensions if explicitly requested.
1690          */
1691         if (vs->flags & VXLAN_F_GPE) {
1692                 if (!vxlan_parse_gpe_hdr(&unparsed, &protocol, skb, vs->flags))
1693                         goto drop;
1694                 raw_proto = true;
1695         }
1696
1697         if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto,
1698                                    !net_eq(vxlan->net, dev_net(vxlan->dev))))
1699                         goto drop;
1700
1701         if (vxlan_collect_metadata(vs)) {
1702                 struct metadata_dst *tun_dst;
1703
1704                 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1705                                          key32_to_tunnel_id(vni), sizeof(*md));
1706
1707                 if (!tun_dst)
1708                         goto drop;
1709
1710                 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1711
1712                 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1713         } else {
1714                 memset(md, 0, sizeof(*md));
1715         }
1716
1717         if (vs->flags & VXLAN_F_REMCSUM_RX)
1718                 if (!vxlan_remcsum(&unparsed, skb, vs->flags))
1719                         goto drop;
1720         if (vs->flags & VXLAN_F_GBP)
1721                 vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md);
1722         /* Note that GBP and GPE can never be active together. This is
1723          * ensured in vxlan_dev_configure.
1724          */
1725
1726         if (unparsed.vx_flags || unparsed.vx_vni) {
1727                 /* If there are any unprocessed flags remaining treat
1728                  * this as a malformed packet. This behavior diverges from
1729                  * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1730                  * in reserved fields are to be ignored. The approach here
1731                  * maintains compatibility with previous stack code, and also
1732                  * is more robust and provides a little more security in
1733                  * adding extensions to VXLAN.
1734                  */
1735                 goto drop;
1736         }
1737
1738         if (!raw_proto) {
1739                 if (!vxlan_set_mac(vxlan, vs, skb, vni))
1740                         goto drop;
1741         } else {
1742                 skb_reset_mac_header(skb);
1743                 skb->dev = vxlan->dev;
1744                 skb->pkt_type = PACKET_HOST;
1745         }
1746
1747         oiph = skb_network_header(skb);
1748         skb_reset_network_header(skb);
1749
1750         if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
1751                 ++vxlan->dev->stats.rx_frame_errors;
1752                 ++vxlan->dev->stats.rx_errors;
1753                 goto drop;
1754         }
1755
1756         rcu_read_lock();
1757
1758         if (unlikely(!(vxlan->dev->flags & IFF_UP))) {
1759                 rcu_read_unlock();
1760                 atomic_long_inc(&vxlan->dev->rx_dropped);
1761                 goto drop;
1762         }
1763
1764         stats = this_cpu_ptr(vxlan->dev->tstats);
1765         u64_stats_update_begin(&stats->syncp);
1766         stats->rx_packets++;
1767         stats->rx_bytes += skb->len;
1768         u64_stats_update_end(&stats->syncp);
1769
1770         gro_cells_receive(&vxlan->gro_cells, skb);
1771
1772         rcu_read_unlock();
1773
1774         return 0;
1775
1776 drop:
1777         /* Consume bad packet */
1778         kfree_skb(skb);
1779         return 0;
1780 }
1781
1782 /* Callback from net/ipv{4,6}/udp.c to check that we have a VNI for errors */
1783 static int vxlan_err_lookup(struct sock *sk, struct sk_buff *skb)
1784 {
1785         struct vxlan_dev *vxlan;
1786         struct vxlan_sock *vs;
1787         struct vxlanhdr *hdr;
1788         __be32 vni;
1789
1790         if (!pskb_may_pull(skb, skb_transport_offset(skb) + VXLAN_HLEN))
1791                 return -EINVAL;
1792
1793         hdr = vxlan_hdr(skb);
1794
1795         if (!(hdr->vx_flags & VXLAN_HF_VNI))
1796                 return -EINVAL;
1797
1798         vs = rcu_dereference_sk_user_data(sk);
1799         if (!vs)
1800                 return -ENOENT;
1801
1802         vni = vxlan_vni(hdr->vx_vni);
1803         vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni);
1804         if (!vxlan)
1805                 return -ENOENT;
1806
1807         return 0;
1808 }
1809
1810 static int arp_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
1811 {
1812         struct vxlan_dev *vxlan = netdev_priv(dev);
1813         struct arphdr *parp;
1814         u8 *arpptr, *sha;
1815         __be32 sip, tip;
1816         struct neighbour *n;
1817
1818         if (dev->flags & IFF_NOARP)
1819                 goto out;
1820
1821         if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1822                 dev->stats.tx_dropped++;
1823                 goto out;
1824         }
1825         parp = arp_hdr(skb);
1826
1827         if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1828              parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1829             parp->ar_pro != htons(ETH_P_IP) ||
1830             parp->ar_op != htons(ARPOP_REQUEST) ||
1831             parp->ar_hln != dev->addr_len ||
1832             parp->ar_pln != 4)
1833                 goto out;
1834         arpptr = (u8 *)parp + sizeof(struct arphdr);
1835         sha = arpptr;
1836         arpptr += dev->addr_len;        /* sha */
1837         memcpy(&sip, arpptr, sizeof(sip));
1838         arpptr += sizeof(sip);
1839         arpptr += dev->addr_len;        /* tha */
1840         memcpy(&tip, arpptr, sizeof(tip));
1841
1842         if (ipv4_is_loopback(tip) ||
1843             ipv4_is_multicast(tip))
1844                 goto out;
1845
1846         n = neigh_lookup(&arp_tbl, &tip, dev);
1847
1848         if (n) {
1849                 struct vxlan_fdb *f;
1850                 struct sk_buff  *reply;
1851
1852                 if (!(n->nud_state & NUD_CONNECTED)) {
1853                         neigh_release(n);
1854                         goto out;
1855                 }
1856
1857                 f = vxlan_find_mac(vxlan, n->ha, vni);
1858                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1859                         /* bridge-local neighbor */
1860                         neigh_release(n);
1861                         goto out;
1862                 }
1863
1864                 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1865                                 n->ha, sha);
1866
1867                 neigh_release(n);
1868
1869                 if (reply == NULL)
1870                         goto out;
1871
1872                 skb_reset_mac_header(reply);
1873                 __skb_pull(reply, skb_network_offset(reply));
1874                 reply->ip_summed = CHECKSUM_UNNECESSARY;
1875                 reply->pkt_type = PACKET_HOST;
1876
1877                 if (netif_rx_ni(reply) == NET_RX_DROP)
1878                         dev->stats.rx_dropped++;
1879         } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
1880                 union vxlan_addr ipa = {
1881                         .sin.sin_addr.s_addr = tip,
1882                         .sin.sin_family = AF_INET,
1883                 };
1884
1885                 vxlan_ip_miss(dev, &ipa);
1886         }
1887 out:
1888         consume_skb(skb);
1889         return NETDEV_TX_OK;
1890 }
1891
1892 #if IS_ENABLED(CONFIG_IPV6)
1893 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1894         struct neighbour *n, bool isrouter)
1895 {
1896         struct net_device *dev = request->dev;
1897         struct sk_buff *reply;
1898         struct nd_msg *ns, *na;
1899         struct ipv6hdr *pip6;
1900         u8 *daddr;
1901         int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1902         int ns_olen;
1903         int i, len;
1904
1905         if (dev == NULL || !pskb_may_pull(request, request->len))
1906                 return NULL;
1907
1908         len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1909                 sizeof(*na) + na_olen + dev->needed_tailroom;
1910         reply = alloc_skb(len, GFP_ATOMIC);
1911         if (reply == NULL)
1912                 return NULL;
1913
1914         reply->protocol = htons(ETH_P_IPV6);
1915         reply->dev = dev;
1916         skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1917         skb_push(reply, sizeof(struct ethhdr));
1918         skb_reset_mac_header(reply);
1919
1920         ns = (struct nd_msg *)(ipv6_hdr(request) + 1);
1921
1922         daddr = eth_hdr(request)->h_source;
1923         ns_olen = request->len - skb_network_offset(request) -
1924                 sizeof(struct ipv6hdr) - sizeof(*ns);
1925         for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1926                 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1927                         daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1928                         break;
1929                 }
1930         }
1931
1932         /* Ethernet header */
1933         ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1934         ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1935         eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1936         reply->protocol = htons(ETH_P_IPV6);
1937
1938         skb_pull(reply, sizeof(struct ethhdr));
1939         skb_reset_network_header(reply);
1940         skb_put(reply, sizeof(struct ipv6hdr));
1941
1942         /* IPv6 header */
1943
1944         pip6 = ipv6_hdr(reply);
1945         memset(pip6, 0, sizeof(struct ipv6hdr));
1946         pip6->version = 6;
1947         pip6->priority = ipv6_hdr(request)->priority;
1948         pip6->nexthdr = IPPROTO_ICMPV6;
1949         pip6->hop_limit = 255;
1950         pip6->daddr = ipv6_hdr(request)->saddr;
1951         pip6->saddr = *(struct in6_addr *)n->primary_key;
1952
1953         skb_pull(reply, sizeof(struct ipv6hdr));
1954         skb_reset_transport_header(reply);
1955
1956         /* Neighbor Advertisement */
1957         na = skb_put_zero(reply, sizeof(*na) + na_olen);
1958         na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1959         na->icmph.icmp6_router = isrouter;
1960         na->icmph.icmp6_override = 1;
1961         na->icmph.icmp6_solicited = 1;
1962         na->target = ns->target;
1963         ether_addr_copy(&na->opt[2], n->ha);
1964         na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1965         na->opt[1] = na_olen >> 3;
1966
1967         na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1968                 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1969                 csum_partial(na, sizeof(*na)+na_olen, 0));
1970
1971         pip6->payload_len = htons(sizeof(*na)+na_olen);
1972
1973         skb_push(reply, sizeof(struct ipv6hdr));
1974
1975         reply->ip_summed = CHECKSUM_UNNECESSARY;
1976
1977         return reply;
1978 }
1979
1980 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
1981 {
1982         struct vxlan_dev *vxlan = netdev_priv(dev);
1983         const struct in6_addr *daddr;
1984         const struct ipv6hdr *iphdr;
1985         struct inet6_dev *in6_dev;
1986         struct neighbour *n;
1987         struct nd_msg *msg;
1988
1989         in6_dev = __in6_dev_get(dev);
1990         if (!in6_dev)
1991                 goto out;
1992
1993         iphdr = ipv6_hdr(skb);
1994         daddr = &iphdr->daddr;
1995         msg = (struct nd_msg *)(iphdr + 1);
1996
1997         if (ipv6_addr_loopback(daddr) ||
1998             ipv6_addr_is_multicast(&msg->target))
1999                 goto out;
2000
2001         n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
2002
2003         if (n) {
2004                 struct vxlan_fdb *f;
2005                 struct sk_buff *reply;
2006
2007                 if (!(n->nud_state & NUD_CONNECTED)) {
2008                         neigh_release(n);
2009                         goto out;
2010                 }
2011
2012                 f = vxlan_find_mac(vxlan, n->ha, vni);
2013                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
2014                         /* bridge-local neighbor */
2015                         neigh_release(n);
2016                         goto out;
2017                 }
2018
2019                 reply = vxlan_na_create(skb, n,
2020                                         !!(f ? f->flags & NTF_ROUTER : 0));
2021
2022                 neigh_release(n);
2023
2024                 if (reply == NULL)
2025                         goto out;
2026
2027                 if (netif_rx_ni(reply) == NET_RX_DROP)
2028                         dev->stats.rx_dropped++;
2029
2030         } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
2031                 union vxlan_addr ipa = {
2032                         .sin6.sin6_addr = msg->target,
2033                         .sin6.sin6_family = AF_INET6,
2034                 };
2035
2036                 vxlan_ip_miss(dev, &ipa);
2037         }
2038
2039 out:
2040         consume_skb(skb);
2041         return NETDEV_TX_OK;
2042 }
2043 #endif
2044
2045 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
2046 {
2047         struct vxlan_dev *vxlan = netdev_priv(dev);
2048         struct neighbour *n;
2049
2050         if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
2051                 return false;
2052
2053         n = NULL;
2054         switch (ntohs(eth_hdr(skb)->h_proto)) {
2055         case ETH_P_IP:
2056         {
2057                 struct iphdr *pip;
2058
2059                 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
2060                         return false;
2061                 pip = ip_hdr(skb);
2062                 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
2063                 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
2064                         union vxlan_addr ipa = {
2065                                 .sin.sin_addr.s_addr = pip->daddr,
2066                                 .sin.sin_family = AF_INET,
2067                         };
2068
2069                         vxlan_ip_miss(dev, &ipa);
2070                         return false;
2071                 }
2072
2073                 break;
2074         }
2075 #if IS_ENABLED(CONFIG_IPV6)
2076         case ETH_P_IPV6:
2077         {
2078                 struct ipv6hdr *pip6;
2079
2080                 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
2081                         return false;
2082                 pip6 = ipv6_hdr(skb);
2083                 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
2084                 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
2085                         union vxlan_addr ipa = {
2086                                 .sin6.sin6_addr = pip6->daddr,
2087                                 .sin6.sin6_family = AF_INET6,
2088                         };
2089
2090                         vxlan_ip_miss(dev, &ipa);
2091                         return false;
2092                 }
2093
2094                 break;
2095         }
2096 #endif
2097         default:
2098                 return false;
2099         }
2100
2101         if (n) {
2102                 bool diff;
2103
2104                 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
2105                 if (diff) {
2106                         memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
2107                                 dev->addr_len);
2108                         memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
2109                 }
2110                 neigh_release(n);
2111                 return diff;
2112         }
2113
2114         return false;
2115 }
2116
2117 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
2118                                 struct vxlan_metadata *md)
2119 {
2120         struct vxlanhdr_gbp *gbp;
2121
2122         if (!md->gbp)
2123                 return;
2124
2125         gbp = (struct vxlanhdr_gbp *)vxh;
2126         vxh->vx_flags |= VXLAN_HF_GBP;
2127
2128         if (md->gbp & VXLAN_GBP_DONT_LEARN)
2129                 gbp->dont_learn = 1;
2130
2131         if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
2132                 gbp->policy_applied = 1;
2133
2134         gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
2135 }
2136
2137 static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, u32 vxflags,
2138                                __be16 protocol)
2139 {
2140         struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh;
2141
2142         gpe->np_applied = 1;
2143         gpe->next_protocol = tun_p_from_eth_p(protocol);
2144         if (!gpe->next_protocol)
2145                 return -EPFNOSUPPORT;
2146         return 0;
2147 }
2148
2149 static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
2150                            int iphdr_len, __be32 vni,
2151                            struct vxlan_metadata *md, u32 vxflags,
2152                            bool udp_sum)
2153 {
2154         struct vxlanhdr *vxh;
2155         int min_headroom;
2156         int err;
2157         int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
2158         __be16 inner_protocol = htons(ETH_P_TEB);
2159
2160         if ((vxflags & VXLAN_F_REMCSUM_TX) &&
2161             skb->ip_summed == CHECKSUM_PARTIAL) {
2162                 int csum_start = skb_checksum_start_offset(skb);
2163
2164                 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
2165                     !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
2166                     (skb->csum_offset == offsetof(struct udphdr, check) ||
2167                      skb->csum_offset == offsetof(struct tcphdr, check)))
2168                         type |= SKB_GSO_TUNNEL_REMCSUM;
2169         }
2170
2171         min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
2172                         + VXLAN_HLEN + iphdr_len;
2173
2174         /* Need space for new headers (invalidates iph ptr) */
2175         err = skb_cow_head(skb, min_headroom);
2176         if (unlikely(err))
2177                 return err;
2178
2179         err = iptunnel_handle_offloads(skb, type);
2180         if (err)
2181                 return err;
2182
2183         vxh = __skb_push(skb, sizeof(*vxh));
2184         vxh->vx_flags = VXLAN_HF_VNI;
2185         vxh->vx_vni = vxlan_vni_field(vni);
2186
2187         if (type & SKB_GSO_TUNNEL_REMCSUM) {
2188                 unsigned int start;
2189
2190                 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
2191                 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
2192                 vxh->vx_flags |= VXLAN_HF_RCO;
2193
2194                 if (!skb_is_gso(skb)) {
2195                         skb->ip_summed = CHECKSUM_NONE;
2196                         skb->encapsulation = 0;
2197                 }
2198         }
2199
2200         if (vxflags & VXLAN_F_GBP)
2201                 vxlan_build_gbp_hdr(vxh, vxflags, md);
2202         if (vxflags & VXLAN_F_GPE) {
2203                 err = vxlan_build_gpe_hdr(vxh, vxflags, skb->protocol);
2204                 if (err < 0)
2205                         return err;
2206                 inner_protocol = skb->protocol;
2207         }
2208
2209         skb_set_inner_protocol(skb, inner_protocol);
2210         return 0;
2211 }
2212
2213 static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan, struct net_device *dev,
2214                                       struct vxlan_sock *sock4,
2215                                       struct sk_buff *skb, int oif, u8 tos,
2216                                       __be32 daddr, __be32 *saddr, __be16 dport, __be16 sport,
2217                                       struct dst_cache *dst_cache,
2218                                       const struct ip_tunnel_info *info)
2219 {
2220         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
2221         struct rtable *rt = NULL;
2222         struct flowi4 fl4;
2223
2224         if (!sock4)
2225                 return ERR_PTR(-EIO);
2226
2227         if (tos && !info)
2228                 use_cache = false;
2229         if (use_cache) {
2230                 rt = dst_cache_get_ip4(dst_cache, saddr);
2231                 if (rt)
2232                         return rt;
2233         }
2234
2235         memset(&fl4, 0, sizeof(fl4));
2236         fl4.flowi4_oif = oif;
2237         fl4.flowi4_tos = RT_TOS(tos);
2238         fl4.flowi4_mark = skb->mark;
2239         fl4.flowi4_proto = IPPROTO_UDP;
2240         fl4.daddr = daddr;
2241         fl4.saddr = *saddr;
2242         fl4.fl4_dport = dport;
2243         fl4.fl4_sport = sport;
2244
2245         rt = ip_route_output_key(vxlan->net, &fl4);
2246         if (!IS_ERR(rt)) {
2247                 if (rt->dst.dev == dev) {
2248                         netdev_dbg(dev, "circular route to %pI4\n", &daddr);
2249                         ip_rt_put(rt);
2250                         return ERR_PTR(-ELOOP);
2251                 }
2252
2253                 *saddr = fl4.saddr;
2254                 if (use_cache)
2255                         dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
2256         } else {
2257                 netdev_dbg(dev, "no route to %pI4\n", &daddr);
2258                 return ERR_PTR(-ENETUNREACH);
2259         }
2260         return rt;
2261 }
2262
2263 #if IS_ENABLED(CONFIG_IPV6)
2264 static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
2265                                           struct net_device *dev,
2266                                           struct vxlan_sock *sock6,
2267                                           struct sk_buff *skb, int oif, u8 tos,
2268                                           __be32 label,
2269                                           const struct in6_addr *daddr,
2270                                           struct in6_addr *saddr,
2271                                           __be16 dport, __be16 sport,
2272                                           struct dst_cache *dst_cache,
2273                                           const struct ip_tunnel_info *info)
2274 {
2275         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
2276         struct dst_entry *ndst;
2277         struct flowi6 fl6;
2278         int err;
2279
2280         if (!sock6)
2281                 return ERR_PTR(-EIO);
2282
2283         if (tos && !info)
2284                 use_cache = false;
2285         if (use_cache) {
2286                 ndst = dst_cache_get_ip6(dst_cache, saddr);
2287                 if (ndst)
2288                         return ndst;
2289         }
2290
2291         memset(&fl6, 0, sizeof(fl6));
2292         fl6.flowi6_oif = oif;
2293         fl6.daddr = *daddr;
2294         fl6.saddr = *saddr;
2295         fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tos), label);
2296         fl6.flowi6_mark = skb->mark;
2297         fl6.flowi6_proto = IPPROTO_UDP;
2298         fl6.fl6_dport = dport;
2299         fl6.fl6_sport = sport;
2300
2301         err = ipv6_stub->ipv6_dst_lookup(vxlan->net,
2302                                          sock6->sock->sk,
2303                                          &ndst, &fl6);
2304         if (unlikely(err < 0)) {
2305                 netdev_dbg(dev, "no route to %pI6\n", daddr);
2306                 return ERR_PTR(-ENETUNREACH);
2307         }
2308
2309         if (unlikely(ndst->dev == dev)) {
2310                 netdev_dbg(dev, "circular route to %pI6\n", daddr);
2311                 dst_release(ndst);
2312                 return ERR_PTR(-ELOOP);
2313         }
2314
2315         *saddr = fl6.saddr;
2316         if (use_cache)
2317                 dst_cache_set_ip6(dst_cache, ndst, saddr);
2318         return ndst;
2319 }
2320 #endif
2321
2322 /* Bypass encapsulation if the destination is local */
2323 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
2324                                struct vxlan_dev *dst_vxlan, __be32 vni)
2325 {
2326         struct pcpu_sw_netstats *tx_stats, *rx_stats;
2327         union vxlan_addr loopback;
2328         union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
2329         struct net_device *dev;
2330         int len = skb->len;
2331
2332         tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
2333         rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
2334         skb->pkt_type = PACKET_HOST;
2335         skb->encapsulation = 0;
2336         skb->dev = dst_vxlan->dev;
2337         __skb_pull(skb, skb_network_offset(skb));
2338
2339         if (remote_ip->sa.sa_family == AF_INET) {
2340                 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
2341                 loopback.sa.sa_family =  AF_INET;
2342 #if IS_ENABLED(CONFIG_IPV6)
2343         } else {
2344                 loopback.sin6.sin6_addr = in6addr_loopback;
2345                 loopback.sa.sa_family =  AF_INET6;
2346 #endif
2347         }
2348
2349         rcu_read_lock();
2350         dev = skb->dev;
2351         if (unlikely(!(dev->flags & IFF_UP))) {
2352                 kfree_skb(skb);
2353                 goto drop;
2354         }
2355
2356         if (dst_vxlan->cfg.flags & VXLAN_F_LEARN)
2357                 vxlan_snoop(dev, &loopback, eth_hdr(skb)->h_source, 0, vni);
2358
2359         u64_stats_update_begin(&tx_stats->syncp);
2360         tx_stats->tx_packets++;
2361         tx_stats->tx_bytes += len;
2362         u64_stats_update_end(&tx_stats->syncp);
2363
2364         if (netif_rx(skb) == NET_RX_SUCCESS) {
2365                 u64_stats_update_begin(&rx_stats->syncp);
2366                 rx_stats->rx_packets++;
2367                 rx_stats->rx_bytes += len;
2368                 u64_stats_update_end(&rx_stats->syncp);
2369         } else {
2370 drop:
2371                 dev->stats.rx_dropped++;
2372         }
2373         rcu_read_unlock();
2374 }
2375
2376 static int encap_bypass_if_local(struct sk_buff *skb, struct net_device *dev,
2377                                  struct vxlan_dev *vxlan,
2378                                  union vxlan_addr *daddr,
2379                                  __be16 dst_port, int dst_ifindex, __be32 vni,
2380                                  struct dst_entry *dst,
2381                                  u32 rt_flags)
2382 {
2383 #if IS_ENABLED(CONFIG_IPV6)
2384         /* IPv6 rt-flags are checked against RTF_LOCAL, but the value of
2385          * RTF_LOCAL is equal to RTCF_LOCAL. So to keep code simple
2386          * we can use RTCF_LOCAL which works for ipv4 and ipv6 route entry.
2387          */
2388         BUILD_BUG_ON(RTCF_LOCAL != RTF_LOCAL);
2389 #endif
2390         /* Bypass encapsulation if the destination is local */
2391         if (rt_flags & RTCF_LOCAL &&
2392             !(rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2393                 struct vxlan_dev *dst_vxlan;
2394
2395                 dst_release(dst);
2396                 dst_vxlan = vxlan_find_vni(vxlan->net, dst_ifindex, vni,
2397                                            daddr->sa.sa_family, dst_port,
2398                                            vxlan->cfg.flags);
2399                 if (!dst_vxlan) {
2400                         dev->stats.tx_errors++;
2401                         kfree_skb(skb);
2402
2403                         return -ENOENT;
2404                 }
2405                 vxlan_encap_bypass(skb, vxlan, dst_vxlan, vni);
2406                 return 1;
2407         }
2408
2409         return 0;
2410 }
2411
2412 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
2413                            __be32 default_vni, struct vxlan_rdst *rdst,
2414                            bool did_rsc)
2415 {
2416         struct dst_cache *dst_cache;
2417         struct ip_tunnel_info *info;
2418         struct vxlan_dev *vxlan = netdev_priv(dev);
2419         const struct iphdr *old_iph = ip_hdr(skb);
2420         union vxlan_addr *dst;
2421         union vxlan_addr remote_ip, local_ip;
2422         struct vxlan_metadata _md;
2423         struct vxlan_metadata *md = &_md;
2424         __be16 src_port = 0, dst_port;
2425         struct dst_entry *ndst = NULL;
2426         __be32 vni, label;
2427         __u8 tos, ttl;
2428         int ifindex;
2429         int err;
2430         u32 flags = vxlan->cfg.flags;
2431         bool udp_sum = false;
2432         bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
2433
2434         info = skb_tunnel_info(skb);
2435
2436         if (rdst) {
2437                 dst = &rdst->remote_ip;
2438                 if (vxlan_addr_any(dst)) {
2439                         if (did_rsc) {
2440                                 /* short-circuited back to local bridge */
2441                                 vxlan_encap_bypass(skb, vxlan, vxlan, default_vni);
2442                                 return;
2443                         }
2444                         goto drop;
2445                 }
2446
2447                 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
2448                 vni = (rdst->remote_vni) ? : default_vni;
2449                 ifindex = rdst->remote_ifindex;
2450                 local_ip = vxlan->cfg.saddr;
2451                 dst_cache = &rdst->dst_cache;
2452                 md->gbp = skb->mark;
2453                 if (flags & VXLAN_F_TTL_INHERIT) {
2454                         ttl = ip_tunnel_get_ttl(old_iph, skb);
2455                 } else {
2456                         ttl = vxlan->cfg.ttl;
2457                         if (!ttl && vxlan_addr_multicast(dst))
2458                                 ttl = 1;
2459                 }
2460
2461                 tos = vxlan->cfg.tos;
2462                 if (tos == 1)
2463                         tos = ip_tunnel_get_dsfield(old_iph, skb);
2464
2465                 if (dst->sa.sa_family == AF_INET)
2466                         udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
2467                 else
2468                         udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2469                 label = vxlan->cfg.label;
2470         } else {
2471                 if (!info) {
2472                         WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
2473                                   dev->name);
2474                         goto drop;
2475                 }
2476                 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
2477                 if (remote_ip.sa.sa_family == AF_INET) {
2478                         remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
2479                         local_ip.sin.sin_addr.s_addr = info->key.u.ipv4.src;
2480                 } else {
2481                         remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
2482                         local_ip.sin6.sin6_addr = info->key.u.ipv6.src;
2483                 }
2484                 dst = &remote_ip;
2485                 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
2486                 vni = tunnel_id_to_key32(info->key.tun_id);
2487                 ifindex = 0;
2488                 dst_cache = &info->dst_cache;
2489                 if (info->key.tun_flags & TUNNEL_VXLAN_OPT) {
2490                         if (info->options_len < sizeof(*md))
2491                                 goto drop;
2492                         md = ip_tunnel_info_opts(info);
2493                 }
2494                 ttl = info->key.ttl;
2495                 tos = info->key.tos;
2496                 label = info->key.label;
2497                 udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
2498         }
2499         src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2500                                      vxlan->cfg.port_max, true);
2501
2502         rcu_read_lock();
2503         if (dst->sa.sa_family == AF_INET) {
2504                 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
2505                 struct rtable *rt;
2506                 __be16 df = 0;
2507
2508                 if (!ifindex)
2509                         ifindex = sock4->sock->sk->sk_bound_dev_if;
2510
2511                 rt = vxlan_get_route(vxlan, dev, sock4, skb, ifindex, tos,
2512                                      dst->sin.sin_addr.s_addr,
2513                                      &local_ip.sin.sin_addr.s_addr,
2514                                      dst_port, src_port,
2515                                      dst_cache, info);
2516                 if (IS_ERR(rt)) {
2517                         err = PTR_ERR(rt);
2518                         goto tx_error;
2519                 }
2520
2521                 if (!info) {
2522                         /* Bypass encapsulation if the destination is local */
2523                         err = encap_bypass_if_local(skb, dev, vxlan, dst,
2524                                                     dst_port, ifindex, vni,
2525                                                     &rt->dst, rt->rt_flags);
2526                         if (err)
2527                                 goto out_unlock;
2528
2529                         if (vxlan->cfg.df == VXLAN_DF_SET) {
2530                                 df = htons(IP_DF);
2531                         } else if (vxlan->cfg.df == VXLAN_DF_INHERIT) {
2532                                 struct ethhdr *eth = eth_hdr(skb);
2533
2534                                 if (ntohs(eth->h_proto) == ETH_P_IPV6 ||
2535                                     (ntohs(eth->h_proto) == ETH_P_IP &&
2536                                      old_iph->frag_off & htons(IP_DF)))
2537                                         df = htons(IP_DF);
2538                         }
2539                 } else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT) {
2540                         df = htons(IP_DF);
2541                 }
2542
2543                 ndst = &rt->dst;
2544                 skb_tunnel_check_pmtu(skb, ndst, VXLAN_HEADROOM);
2545
2546                 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2547                 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2548                 err = vxlan_build_skb(skb, ndst, sizeof(struct iphdr),
2549                                       vni, md, flags, udp_sum);
2550                 if (err < 0)
2551                         goto tx_error;
2552
2553                 udp_tunnel_xmit_skb(rt, sock4->sock->sk, skb, local_ip.sin.sin_addr.s_addr,
2554                                     dst->sin.sin_addr.s_addr, tos, ttl, df,
2555                                     src_port, dst_port, xnet, !udp_sum);
2556 #if IS_ENABLED(CONFIG_IPV6)
2557         } else {
2558                 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
2559
2560                 if (!ifindex)
2561                         ifindex = sock6->sock->sk->sk_bound_dev_if;
2562
2563                 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, ifindex, tos,
2564                                         label, &dst->sin6.sin6_addr,
2565                                         &local_ip.sin6.sin6_addr,
2566                                         dst_port, src_port,
2567                                         dst_cache, info);
2568                 if (IS_ERR(ndst)) {
2569                         err = PTR_ERR(ndst);
2570                         ndst = NULL;
2571                         goto tx_error;
2572                 }
2573
2574                 if (!info) {
2575                         u32 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2576
2577                         err = encap_bypass_if_local(skb, dev, vxlan, dst,
2578                                                     dst_port, ifindex, vni,
2579                                                     ndst, rt6i_flags);
2580                         if (err)
2581                                 goto out_unlock;
2582                 }
2583
2584                 skb_tunnel_check_pmtu(skb, ndst, VXLAN6_HEADROOM);
2585
2586                 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2587                 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2588                 skb_scrub_packet(skb, xnet);
2589                 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
2590                                       vni, md, flags, udp_sum);
2591                 if (err < 0)
2592                         goto tx_error;
2593
2594                 udp_tunnel6_xmit_skb(ndst, sock6->sock->sk, skb, dev,
2595                                      &local_ip.sin6.sin6_addr,
2596                                      &dst->sin6.sin6_addr, tos, ttl,
2597                                      label, src_port, dst_port, !udp_sum);
2598 #endif
2599         }
2600 out_unlock:
2601         rcu_read_unlock();
2602         return;
2603
2604 drop:
2605         dev->stats.tx_dropped++;
2606         dev_kfree_skb(skb);
2607         return;
2608
2609 tx_error:
2610         rcu_read_unlock();
2611         if (err == -ELOOP)
2612                 dev->stats.collisions++;
2613         else if (err == -ENETUNREACH)
2614                 dev->stats.tx_carrier_errors++;
2615         dst_release(ndst);
2616         dev->stats.tx_errors++;
2617         kfree_skb(skb);
2618 }
2619
2620 /* Transmit local packets over Vxlan
2621  *
2622  * Outer IP header inherits ECN and DF from inner header.
2623  * Outer UDP destination is the VXLAN assigned port.
2624  *           source port is based on hash of flow
2625  */
2626 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2627 {
2628         struct vxlan_dev *vxlan = netdev_priv(dev);
2629         struct vxlan_rdst *rdst, *fdst = NULL;
2630         const struct ip_tunnel_info *info;
2631         bool did_rsc = false;
2632         struct vxlan_fdb *f;
2633         struct ethhdr *eth;
2634         __be32 vni = 0;
2635
2636         info = skb_tunnel_info(skb);
2637
2638         skb_reset_mac_header(skb);
2639
2640         if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
2641                 if (info && info->mode & IP_TUNNEL_INFO_BRIDGE &&
2642                     info->mode & IP_TUNNEL_INFO_TX) {
2643                         vni = tunnel_id_to_key32(info->key.tun_id);
2644                 } else {
2645                         if (info && info->mode & IP_TUNNEL_INFO_TX)
2646                                 vxlan_xmit_one(skb, dev, vni, NULL, false);
2647                         else
2648                                 kfree_skb(skb);
2649                         return NETDEV_TX_OK;
2650                 }
2651         }
2652
2653         if (vxlan->cfg.flags & VXLAN_F_PROXY) {
2654                 eth = eth_hdr(skb);
2655                 if (ntohs(eth->h_proto) == ETH_P_ARP)
2656                         return arp_reduce(dev, skb, vni);
2657 #if IS_ENABLED(CONFIG_IPV6)
2658                 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2659                          pskb_may_pull(skb, sizeof(struct ipv6hdr) +
2660                                             sizeof(struct nd_msg)) &&
2661                          ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2662                         struct nd_msg *m = (struct nd_msg *)(ipv6_hdr(skb) + 1);
2663
2664                         if (m->icmph.icmp6_code == 0 &&
2665                             m->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2666                                 return neigh_reduce(dev, skb, vni);
2667                 }
2668 #endif
2669         }
2670
2671         eth = eth_hdr(skb);
2672         f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2673         did_rsc = false;
2674
2675         if (f && (f->flags & NTF_ROUTER) && (vxlan->cfg.flags & VXLAN_F_RSC) &&
2676             (ntohs(eth->h_proto) == ETH_P_IP ||
2677              ntohs(eth->h_proto) == ETH_P_IPV6)) {
2678                 did_rsc = route_shortcircuit(dev, skb);
2679                 if (did_rsc)
2680                         f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2681         }
2682
2683         if (f == NULL) {
2684                 f = vxlan_find_mac(vxlan, all_zeros_mac, vni);
2685                 if (f == NULL) {
2686                         if ((vxlan->cfg.flags & VXLAN_F_L2MISS) &&
2687                             !is_multicast_ether_addr(eth->h_dest))
2688                                 vxlan_fdb_miss(vxlan, eth->h_dest);
2689
2690                         dev->stats.tx_dropped++;
2691                         kfree_skb(skb);
2692                         return NETDEV_TX_OK;
2693                 }
2694         }
2695
2696         list_for_each_entry_rcu(rdst, &f->remotes, list) {
2697                 struct sk_buff *skb1;
2698
2699                 if (!fdst) {
2700                         fdst = rdst;
2701                         continue;
2702                 }
2703                 skb1 = skb_clone(skb, GFP_ATOMIC);
2704                 if (skb1)
2705                         vxlan_xmit_one(skb1, dev, vni, rdst, did_rsc);
2706         }
2707
2708         if (fdst)
2709                 vxlan_xmit_one(skb, dev, vni, fdst, did_rsc);
2710         else
2711                 kfree_skb(skb);
2712         return NETDEV_TX_OK;
2713 }
2714
2715 /* Walk the forwarding table and purge stale entries */
2716 static void vxlan_cleanup(struct timer_list *t)
2717 {
2718         struct vxlan_dev *vxlan = from_timer(vxlan, t, age_timer);
2719         unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2720         unsigned int h;
2721
2722         if (!netif_running(vxlan->dev))
2723                 return;
2724
2725         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2726                 struct hlist_node *p, *n;
2727
2728                 spin_lock(&vxlan->hash_lock[h]);
2729                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2730                         struct vxlan_fdb *f
2731                                 = container_of(p, struct vxlan_fdb, hlist);
2732                         unsigned long timeout;
2733
2734                         if (f->state & (NUD_PERMANENT | NUD_NOARP))
2735                                 continue;
2736
2737                         if (f->flags & NTF_EXT_LEARNED)
2738                                 continue;
2739
2740                         timeout = f->used + vxlan->cfg.age_interval * HZ;
2741                         if (time_before_eq(timeout, jiffies)) {
2742                                 netdev_dbg(vxlan->dev,
2743                                            "garbage collect %pM\n",
2744                                            f->eth_addr);
2745                                 f->state = NUD_STALE;
2746                                 vxlan_fdb_destroy(vxlan, f, true, true);
2747                         } else if (time_before(timeout, next_timer))
2748                                 next_timer = timeout;
2749                 }
2750                 spin_unlock(&vxlan->hash_lock[h]);
2751         }
2752
2753         mod_timer(&vxlan->age_timer, next_timer);
2754 }
2755
2756 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan)
2757 {
2758         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2759
2760         spin_lock(&vn->sock_lock);
2761         hlist_del_init_rcu(&vxlan->hlist4.hlist);
2762 #if IS_ENABLED(CONFIG_IPV6)
2763         hlist_del_init_rcu(&vxlan->hlist6.hlist);
2764 #endif
2765         spin_unlock(&vn->sock_lock);
2766 }
2767
2768 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan,
2769                              struct vxlan_dev_node *node)
2770 {
2771         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2772         __be32 vni = vxlan->default_dst.remote_vni;
2773
2774         node->vxlan = vxlan;
2775         spin_lock(&vn->sock_lock);
2776         hlist_add_head_rcu(&node->hlist, vni_head(vs, vni));
2777         spin_unlock(&vn->sock_lock);
2778 }
2779
2780 /* Setup stats when device is created */
2781 static int vxlan_init(struct net_device *dev)
2782 {
2783         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2784         if (!dev->tstats)
2785                 return -ENOMEM;
2786
2787         return 0;
2788 }
2789
2790 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan, __be32 vni)
2791 {
2792         struct vxlan_fdb *f;
2793         u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, vni);
2794
2795         spin_lock_bh(&vxlan->hash_lock[hash_index]);
2796         f = __vxlan_find_mac(vxlan, all_zeros_mac, vni);
2797         if (f)
2798                 vxlan_fdb_destroy(vxlan, f, true, true);
2799         spin_unlock_bh(&vxlan->hash_lock[hash_index]);
2800 }
2801
2802 static void vxlan_uninit(struct net_device *dev)
2803 {
2804         struct vxlan_dev *vxlan = netdev_priv(dev);
2805
2806         gro_cells_destroy(&vxlan->gro_cells);
2807
2808         vxlan_fdb_delete_default(vxlan, vxlan->cfg.vni);
2809
2810         free_percpu(dev->tstats);
2811 }
2812
2813 /* Start ageing timer and join group when device is brought up */
2814 static int vxlan_open(struct net_device *dev)
2815 {
2816         struct vxlan_dev *vxlan = netdev_priv(dev);
2817         int ret;
2818
2819         ret = vxlan_sock_add(vxlan);
2820         if (ret < 0)
2821                 return ret;
2822
2823         if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2824                 ret = vxlan_igmp_join(vxlan);
2825                 if (ret == -EADDRINUSE)
2826                         ret = 0;
2827                 if (ret) {
2828                         vxlan_sock_release(vxlan);
2829                         return ret;
2830                 }
2831         }
2832
2833         if (vxlan->cfg.age_interval)
2834                 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2835
2836         return ret;
2837 }
2838
2839 /* Purge the forwarding table */
2840 static void vxlan_flush(struct vxlan_dev *vxlan, bool do_all)
2841 {
2842         unsigned int h;
2843
2844         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2845                 struct hlist_node *p, *n;
2846
2847                 spin_lock_bh(&vxlan->hash_lock[h]);
2848                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2849                         struct vxlan_fdb *f
2850                                 = container_of(p, struct vxlan_fdb, hlist);
2851                         if (!do_all && (f->state & (NUD_PERMANENT | NUD_NOARP)))
2852                                 continue;
2853                         /* the all_zeros_mac entry is deleted at vxlan_uninit */
2854                         if (!is_zero_ether_addr(f->eth_addr))
2855                                 vxlan_fdb_destroy(vxlan, f, true, true);
2856                 }
2857                 spin_unlock_bh(&vxlan->hash_lock[h]);
2858         }
2859 }
2860
2861 /* Cleanup timer and forwarding table on shutdown */
2862 static int vxlan_stop(struct net_device *dev)
2863 {
2864         struct vxlan_dev *vxlan = netdev_priv(dev);
2865         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2866         int ret = 0;
2867
2868         if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2869             !vxlan_group_used(vn, vxlan))
2870                 ret = vxlan_igmp_leave(vxlan);
2871
2872         del_timer_sync(&vxlan->age_timer);
2873
2874         vxlan_flush(vxlan, false);
2875         vxlan_sock_release(vxlan);
2876
2877         return ret;
2878 }
2879
2880 /* Stub, nothing needs to be done. */
2881 static void vxlan_set_multicast_list(struct net_device *dev)
2882 {
2883 }
2884
2885 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2886 {
2887         struct vxlan_dev *vxlan = netdev_priv(dev);
2888         struct vxlan_rdst *dst = &vxlan->default_dst;
2889         struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
2890                                                          dst->remote_ifindex);
2891         bool use_ipv6 = !!(vxlan->cfg.flags & VXLAN_F_IPV6);
2892
2893         /* This check is different than dev->max_mtu, because it looks at
2894          * the lowerdev->mtu, rather than the static dev->max_mtu
2895          */
2896         if (lowerdev) {
2897                 int max_mtu = lowerdev->mtu -
2898                               (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2899                 if (new_mtu > max_mtu)
2900                         return -EINVAL;
2901         }
2902
2903         dev->mtu = new_mtu;
2904         return 0;
2905 }
2906
2907 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
2908 {
2909         struct vxlan_dev *vxlan = netdev_priv(dev);
2910         struct ip_tunnel_info *info = skb_tunnel_info(skb);
2911         __be16 sport, dport;
2912
2913         sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2914                                   vxlan->cfg.port_max, true);
2915         dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
2916
2917         if (ip_tunnel_info_af(info) == AF_INET) {
2918                 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
2919                 struct rtable *rt;
2920
2921                 rt = vxlan_get_route(vxlan, dev, sock4, skb, 0, info->key.tos,
2922                                      info->key.u.ipv4.dst,
2923                                      &info->key.u.ipv4.src, dport, sport,
2924                                      &info->dst_cache, info);
2925                 if (IS_ERR(rt))
2926                         return PTR_ERR(rt);
2927                 ip_rt_put(rt);
2928         } else {
2929 #if IS_ENABLED(CONFIG_IPV6)
2930                 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
2931                 struct dst_entry *ndst;
2932
2933                 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, 0, info->key.tos,
2934                                         info->key.label, &info->key.u.ipv6.dst,
2935                                         &info->key.u.ipv6.src, dport, sport,
2936                                         &info->dst_cache, info);
2937                 if (IS_ERR(ndst))
2938                         return PTR_ERR(ndst);
2939                 dst_release(ndst);
2940 #else /* !CONFIG_IPV6 */
2941                 return -EPFNOSUPPORT;
2942 #endif
2943         }
2944         info->key.tp_src = sport;
2945         info->key.tp_dst = dport;
2946         return 0;
2947 }
2948
2949 static const struct net_device_ops vxlan_netdev_ether_ops = {
2950         .ndo_init               = vxlan_init,
2951         .ndo_uninit             = vxlan_uninit,
2952         .ndo_open               = vxlan_open,
2953         .ndo_stop               = vxlan_stop,
2954         .ndo_start_xmit         = vxlan_xmit,
2955         .ndo_get_stats64        = ip_tunnel_get_stats64,
2956         .ndo_set_rx_mode        = vxlan_set_multicast_list,
2957         .ndo_change_mtu         = vxlan_change_mtu,
2958         .ndo_validate_addr      = eth_validate_addr,
2959         .ndo_set_mac_address    = eth_mac_addr,
2960         .ndo_fdb_add            = vxlan_fdb_add,
2961         .ndo_fdb_del            = vxlan_fdb_delete,
2962         .ndo_fdb_dump           = vxlan_fdb_dump,
2963         .ndo_fdb_get            = vxlan_fdb_get,
2964         .ndo_fill_metadata_dst  = vxlan_fill_metadata_dst,
2965         .ndo_change_proto_down  = dev_change_proto_down_generic,
2966 };
2967
2968 static const struct net_device_ops vxlan_netdev_raw_ops = {
2969         .ndo_init               = vxlan_init,
2970         .ndo_uninit             = vxlan_uninit,
2971         .ndo_open               = vxlan_open,
2972         .ndo_stop               = vxlan_stop,
2973         .ndo_start_xmit         = vxlan_xmit,
2974         .ndo_get_stats64        = ip_tunnel_get_stats64,
2975         .ndo_change_mtu         = vxlan_change_mtu,
2976         .ndo_fill_metadata_dst  = vxlan_fill_metadata_dst,
2977 };
2978
2979 /* Info for udev, that this is a virtual tunnel endpoint */
2980 static struct device_type vxlan_type = {
2981         .name = "vxlan",
2982 };
2983
2984 /* Calls the ndo_udp_tunnel_add of the caller in order to
2985  * supply the listening VXLAN udp ports. Callers are expected
2986  * to implement the ndo_udp_tunnel_add.
2987  */
2988 static void vxlan_offload_rx_ports(struct net_device *dev, bool push)
2989 {
2990         struct vxlan_sock *vs;
2991         struct net *net = dev_net(dev);
2992         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2993         unsigned int i;
2994
2995         spin_lock(&vn->sock_lock);
2996         for (i = 0; i < PORT_HASH_SIZE; ++i) {
2997                 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2998                         unsigned short type;
2999
3000                         if (vs->flags & VXLAN_F_GPE)
3001                                 type = UDP_TUNNEL_TYPE_VXLAN_GPE;
3002                         else
3003                                 type = UDP_TUNNEL_TYPE_VXLAN;
3004
3005                         if (push)
3006                                 udp_tunnel_push_rx_port(dev, vs->sock, type);
3007                         else
3008                                 udp_tunnel_drop_rx_port(dev, vs->sock, type);
3009                 }
3010         }
3011         spin_unlock(&vn->sock_lock);
3012 }
3013
3014 /* Initialize the device structure. */
3015 static void vxlan_setup(struct net_device *dev)
3016 {
3017         struct vxlan_dev *vxlan = netdev_priv(dev);
3018         unsigned int h;
3019
3020         eth_hw_addr_random(dev);
3021         ether_setup(dev);
3022
3023         dev->needs_free_netdev = true;
3024         SET_NETDEV_DEVTYPE(dev, &vxlan_type);
3025
3026         dev->features   |= NETIF_F_LLTX;
3027         dev->features   |= NETIF_F_SG | NETIF_F_HW_CSUM;
3028         dev->features   |= NETIF_F_RXCSUM;
3029         dev->features   |= NETIF_F_GSO_SOFTWARE;
3030
3031         dev->vlan_features = dev->features;
3032         dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
3033         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
3034         netif_keep_dst(dev);
3035         dev->priv_flags |= IFF_NO_QUEUE;
3036
3037         /* MTU range: 68 - 65535 */
3038         dev->min_mtu = ETH_MIN_MTU;
3039         dev->max_mtu = ETH_MAX_MTU;
3040
3041         INIT_LIST_HEAD(&vxlan->next);
3042
3043         timer_setup(&vxlan->age_timer, vxlan_cleanup, TIMER_DEFERRABLE);
3044
3045         vxlan->dev = dev;
3046
3047         gro_cells_init(&vxlan->gro_cells, dev);
3048
3049         for (h = 0; h < FDB_HASH_SIZE; ++h) {
3050                 spin_lock_init(&vxlan->hash_lock[h]);
3051                 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
3052         }
3053 }
3054
3055 static void vxlan_ether_setup(struct net_device *dev)
3056 {
3057         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
3058         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
3059         dev->netdev_ops = &vxlan_netdev_ether_ops;
3060 }
3061
3062 static void vxlan_raw_setup(struct net_device *dev)
3063 {
3064         dev->header_ops = NULL;
3065         dev->type = ARPHRD_NONE;
3066         dev->hard_header_len = 0;
3067         dev->addr_len = 0;
3068         dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
3069         dev->netdev_ops = &vxlan_netdev_raw_ops;
3070 }
3071
3072 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
3073         [IFLA_VXLAN_ID]         = { .type = NLA_U32 },
3074         [IFLA_VXLAN_GROUP]      = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
3075         [IFLA_VXLAN_GROUP6]     = { .len = sizeof(struct in6_addr) },
3076         [IFLA_VXLAN_LINK]       = { .type = NLA_U32 },
3077         [IFLA_VXLAN_LOCAL]      = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
3078         [IFLA_VXLAN_LOCAL6]     = { .len = sizeof(struct in6_addr) },
3079         [IFLA_VXLAN_TOS]        = { .type = NLA_U8 },
3080         [IFLA_VXLAN_TTL]        = { .type = NLA_U8 },
3081         [IFLA_VXLAN_LABEL]      = { .type = NLA_U32 },
3082         [IFLA_VXLAN_LEARNING]   = { .type = NLA_U8 },
3083         [IFLA_VXLAN_AGEING]     = { .type = NLA_U32 },
3084         [IFLA_VXLAN_LIMIT]      = { .type = NLA_U32 },
3085         [IFLA_VXLAN_PORT_RANGE] = { .len  = sizeof(struct ifla_vxlan_port_range) },
3086         [IFLA_VXLAN_PROXY]      = { .type = NLA_U8 },
3087         [IFLA_VXLAN_RSC]        = { .type = NLA_U8 },
3088         [IFLA_VXLAN_L2MISS]     = { .type = NLA_U8 },
3089         [IFLA_VXLAN_L3MISS]     = { .type = NLA_U8 },
3090         [IFLA_VXLAN_COLLECT_METADATA]   = { .type = NLA_U8 },
3091         [IFLA_VXLAN_PORT]       = { .type = NLA_U16 },
3092         [IFLA_VXLAN_UDP_CSUM]   = { .type = NLA_U8 },
3093         [IFLA_VXLAN_UDP_ZERO_CSUM6_TX]  = { .type = NLA_U8 },
3094         [IFLA_VXLAN_UDP_ZERO_CSUM6_RX]  = { .type = NLA_U8 },
3095         [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
3096         [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
3097         [IFLA_VXLAN_GBP]        = { .type = NLA_FLAG, },
3098         [IFLA_VXLAN_GPE]        = { .type = NLA_FLAG, },
3099         [IFLA_VXLAN_REMCSUM_NOPARTIAL]  = { .type = NLA_FLAG },
3100         [IFLA_VXLAN_TTL_INHERIT]        = { .type = NLA_FLAG },
3101         [IFLA_VXLAN_DF]         = { .type = NLA_U8 },
3102 };
3103
3104 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[],
3105                           struct netlink_ext_ack *extack)
3106 {
3107         if (tb[IFLA_ADDRESS]) {
3108                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
3109                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
3110                                             "Provided link layer address is not Ethernet");
3111                         return -EINVAL;
3112                 }
3113
3114                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
3115                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
3116                                             "Provided Ethernet address is not unicast");
3117                         return -EADDRNOTAVAIL;
3118                 }
3119         }
3120
3121         if (tb[IFLA_MTU]) {
3122                 u32 mtu = nla_get_u32(tb[IFLA_MTU]);
3123
3124                 if (mtu < ETH_MIN_MTU || mtu > ETH_MAX_MTU) {
3125                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU],
3126                                             "MTU must be between 68 and 65535");
3127                         return -EINVAL;
3128                 }
3129         }
3130
3131         if (!data) {
3132                 NL_SET_ERR_MSG(extack,
3133                                "Required attributes not provided to perform the operation");
3134                 return -EINVAL;
3135         }
3136
3137         if (data[IFLA_VXLAN_ID]) {
3138                 u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
3139
3140                 if (id >= VXLAN_N_VID) {
3141                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_ID],
3142                                             "VXLAN ID must be lower than 16777216");
3143                         return -ERANGE;
3144                 }
3145         }
3146
3147         if (data[IFLA_VXLAN_PORT_RANGE]) {
3148                 const struct ifla_vxlan_port_range *p
3149                         = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
3150
3151                 if (ntohs(p->high) < ntohs(p->low)) {
3152                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT_RANGE],
3153                                             "Invalid source port range");
3154                         return -EINVAL;
3155                 }
3156         }
3157
3158         if (data[IFLA_VXLAN_DF]) {
3159                 enum ifla_vxlan_df df = nla_get_u8(data[IFLA_VXLAN_DF]);
3160
3161                 if (df < 0 || df > VXLAN_DF_MAX) {
3162                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_DF],
3163                                             "Invalid DF attribute");
3164                         return -EINVAL;
3165                 }
3166         }
3167
3168         return 0;
3169 }
3170
3171 static void vxlan_get_drvinfo(struct net_device *netdev,
3172                               struct ethtool_drvinfo *drvinfo)
3173 {
3174         strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
3175         strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
3176 }
3177
3178 static int vxlan_get_link_ksettings(struct net_device *dev,
3179                                     struct ethtool_link_ksettings *cmd)
3180 {
3181         struct vxlan_dev *vxlan = netdev_priv(dev);
3182         struct vxlan_rdst *dst = &vxlan->default_dst;
3183         struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
3184                                                          dst->remote_ifindex);
3185
3186         if (!lowerdev) {
3187                 cmd->base.duplex = DUPLEX_UNKNOWN;
3188                 cmd->base.port = PORT_OTHER;
3189                 cmd->base.speed = SPEED_UNKNOWN;
3190
3191                 return 0;
3192         }
3193
3194         return __ethtool_get_link_ksettings(lowerdev, cmd);
3195 }
3196
3197 static const struct ethtool_ops vxlan_ethtool_ops = {
3198         .get_drvinfo            = vxlan_get_drvinfo,
3199         .get_link               = ethtool_op_get_link,
3200         .get_link_ksettings     = vxlan_get_link_ksettings,
3201 };
3202
3203 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
3204                                         __be16 port, u32 flags, int ifindex)
3205 {
3206         struct socket *sock;
3207         struct udp_port_cfg udp_conf;
3208         int err;
3209
3210         memset(&udp_conf, 0, sizeof(udp_conf));
3211
3212         if (ipv6) {
3213                 udp_conf.family = AF_INET6;
3214                 udp_conf.use_udp6_rx_checksums =
3215                     !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
3216                 udp_conf.ipv6_v6only = 1;
3217         } else {
3218                 udp_conf.family = AF_INET;
3219         }
3220
3221         udp_conf.local_udp_port = port;
3222         udp_conf.bind_ifindex = ifindex;
3223
3224         /* Open UDP socket */
3225         err = udp_sock_create(net, &udp_conf, &sock);
3226         if (err < 0)
3227                 return ERR_PTR(err);
3228
3229         return sock;
3230 }
3231
3232 /* Create new listen socket if needed */
3233 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
3234                                               __be16 port, u32 flags,
3235                                               int ifindex)
3236 {
3237         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3238         struct vxlan_sock *vs;
3239         struct socket *sock;
3240         unsigned int h;
3241         struct udp_tunnel_sock_cfg tunnel_cfg;
3242
3243         vs = kzalloc(sizeof(*vs), GFP_KERNEL);
3244         if (!vs)
3245                 return ERR_PTR(-ENOMEM);
3246
3247         for (h = 0; h < VNI_HASH_SIZE; ++h)
3248                 INIT_HLIST_HEAD(&vs->vni_list[h]);
3249
3250         sock = vxlan_create_sock(net, ipv6, port, flags, ifindex);
3251         if (IS_ERR(sock)) {
3252                 kfree(vs);
3253                 return ERR_CAST(sock);
3254         }
3255
3256         vs->sock = sock;
3257         refcount_set(&vs->refcnt, 1);
3258         vs->flags = (flags & VXLAN_F_RCV_FLAGS);
3259
3260         spin_lock(&vn->sock_lock);
3261         hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
3262         udp_tunnel_notify_add_rx_port(sock,
3263                                       (vs->flags & VXLAN_F_GPE) ?
3264                                       UDP_TUNNEL_TYPE_VXLAN_GPE :
3265                                       UDP_TUNNEL_TYPE_VXLAN);
3266         spin_unlock(&vn->sock_lock);
3267
3268         /* Mark socket as an encapsulation socket. */
3269         memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
3270         tunnel_cfg.sk_user_data = vs;
3271         tunnel_cfg.encap_type = 1;
3272         tunnel_cfg.encap_rcv = vxlan_rcv;
3273         tunnel_cfg.encap_err_lookup = vxlan_err_lookup;
3274         tunnel_cfg.encap_destroy = NULL;
3275         tunnel_cfg.gro_receive = vxlan_gro_receive;
3276         tunnel_cfg.gro_complete = vxlan_gro_complete;
3277
3278         setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
3279
3280         return vs;
3281 }
3282
3283 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
3284 {
3285         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
3286         struct vxlan_sock *vs = NULL;
3287         struct vxlan_dev_node *node;
3288         int l3mdev_index = 0;
3289
3290         if (vxlan->cfg.remote_ifindex)
3291                 l3mdev_index = l3mdev_master_upper_ifindex_by_index(
3292                         vxlan->net, vxlan->cfg.remote_ifindex);
3293
3294         if (!vxlan->cfg.no_share) {
3295                 spin_lock(&vn->sock_lock);
3296                 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
3297                                      vxlan->cfg.dst_port, vxlan->cfg.flags,
3298                                      l3mdev_index);
3299                 if (vs && !refcount_inc_not_zero(&vs->refcnt)) {
3300                         spin_unlock(&vn->sock_lock);
3301                         return -EBUSY;
3302                 }
3303                 spin_unlock(&vn->sock_lock);
3304         }
3305         if (!vs)
3306                 vs = vxlan_socket_create(vxlan->net, ipv6,
3307                                          vxlan->cfg.dst_port, vxlan->cfg.flags,
3308                                          l3mdev_index);
3309         if (IS_ERR(vs))
3310                 return PTR_ERR(vs);
3311 #if IS_ENABLED(CONFIG_IPV6)
3312         if (ipv6) {
3313                 rcu_assign_pointer(vxlan->vn6_sock, vs);
3314                 node = &vxlan->hlist6;
3315         } else
3316 #endif
3317         {
3318                 rcu_assign_pointer(vxlan->vn4_sock, vs);
3319                 node = &vxlan->hlist4;
3320         }
3321         vxlan_vs_add_dev(vs, vxlan, node);
3322         return 0;
3323 }
3324
3325 static int vxlan_sock_add(struct vxlan_dev *vxlan)
3326 {
3327         bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA;
3328         bool ipv6 = vxlan->cfg.flags & VXLAN_F_IPV6 || metadata;
3329         bool ipv4 = !ipv6 || metadata;
3330         int ret = 0;
3331
3332         RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
3333 #if IS_ENABLED(CONFIG_IPV6)
3334         RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
3335         if (ipv6) {
3336                 ret = __vxlan_sock_add(vxlan, true);
3337                 if (ret < 0 && ret != -EAFNOSUPPORT)
3338                         ipv4 = false;
3339         }
3340 #endif
3341         if (ipv4)
3342                 ret = __vxlan_sock_add(vxlan, false);
3343         if (ret < 0)
3344                 vxlan_sock_release(vxlan);
3345         return ret;
3346 }
3347
3348 static int vxlan_config_validate(struct net *src_net, struct vxlan_config *conf,
3349                                  struct net_device **lower,
3350                                  struct vxlan_dev *old,
3351                                  struct netlink_ext_ack *extack)
3352 {
3353         struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
3354         struct vxlan_dev *tmp;
3355         bool use_ipv6 = false;
3356
3357         if (conf->flags & VXLAN_F_GPE) {
3358                 /* For now, allow GPE only together with
3359                  * COLLECT_METADATA. This can be relaxed later; in such
3360                  * case, the other side of the PtP link will have to be
3361                  * provided.
3362                  */
3363                 if ((conf->flags & ~VXLAN_F_ALLOWED_GPE) ||
3364                     !(conf->flags & VXLAN_F_COLLECT_METADATA)) {
3365                         NL_SET_ERR_MSG(extack,
3366                                        "VXLAN GPE does not support this combination of attributes");
3367                         return -EINVAL;
3368                 }
3369         }
3370
3371         if (!conf->remote_ip.sa.sa_family && !conf->saddr.sa.sa_family) {
3372                 /* Unless IPv6 is explicitly requested, assume IPv4 */
3373                 conf->remote_ip.sa.sa_family = AF_INET;
3374                 conf->saddr.sa.sa_family = AF_INET;
3375         } else if (!conf->remote_ip.sa.sa_family) {
3376                 conf->remote_ip.sa.sa_family = conf->saddr.sa.sa_family;
3377         } else if (!conf->saddr.sa.sa_family) {
3378                 conf->saddr.sa.sa_family = conf->remote_ip.sa.sa_family;
3379         }
3380
3381         if (conf->saddr.sa.sa_family != conf->remote_ip.sa.sa_family) {
3382                 NL_SET_ERR_MSG(extack,
3383                                "Local and remote address must be from the same family");
3384                 return -EINVAL;
3385         }
3386
3387         if (vxlan_addr_multicast(&conf->saddr)) {
3388                 NL_SET_ERR_MSG(extack, "Local address cannot be multicast");
3389                 return -EINVAL;
3390         }
3391
3392         if (conf->saddr.sa.sa_family == AF_INET6) {
3393                 if (!IS_ENABLED(CONFIG_IPV6)) {
3394                         NL_SET_ERR_MSG(extack,
3395                                        "IPv6 support not enabled in the kernel");
3396                         return -EPFNOSUPPORT;
3397                 }
3398                 use_ipv6 = true;
3399                 conf->flags |= VXLAN_F_IPV6;
3400
3401                 if (!(conf->flags & VXLAN_F_COLLECT_METADATA)) {
3402                         int local_type =
3403                                 ipv6_addr_type(&conf->saddr.sin6.sin6_addr);
3404                         int remote_type =
3405                                 ipv6_addr_type(&conf->remote_ip.sin6.sin6_addr);
3406
3407                         if (local_type & IPV6_ADDR_LINKLOCAL) {
3408                                 if (!(remote_type & IPV6_ADDR_LINKLOCAL) &&
3409                                     (remote_type != IPV6_ADDR_ANY)) {
3410                                         NL_SET_ERR_MSG(extack,
3411                                                        "Invalid combination of local and remote address scopes");
3412                                         return -EINVAL;
3413                                 }
3414
3415                                 conf->flags |= VXLAN_F_IPV6_LINKLOCAL;
3416                         } else {
3417                                 if (remote_type ==
3418                                     (IPV6_ADDR_UNICAST | IPV6_ADDR_LINKLOCAL)) {
3419                                         NL_SET_ERR_MSG(extack,
3420                                                        "Invalid combination of local and remote address scopes");
3421                                         return -EINVAL;
3422                                 }
3423
3424                                 conf->flags &= ~VXLAN_F_IPV6_LINKLOCAL;
3425                         }
3426                 }
3427         }
3428
3429         if (conf->label && !use_ipv6) {
3430                 NL_SET_ERR_MSG(extack,
3431                                "Label attribute only applies to IPv6 VXLAN devices");
3432                 return -EINVAL;
3433         }
3434
3435         if (conf->remote_ifindex) {
3436                 struct net_device *lowerdev;
3437
3438                 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
3439                 if (!lowerdev) {
3440                         NL_SET_ERR_MSG(extack,
3441                                        "Invalid local interface, device not found");
3442                         return -ENODEV;
3443                 }
3444
3445 #if IS_ENABLED(CONFIG_IPV6)
3446                 if (use_ipv6) {
3447                         struct inet6_dev *idev = __in6_dev_get(lowerdev);
3448                         if (idev && idev->cnf.disable_ipv6) {
3449                                 NL_SET_ERR_MSG(extack,
3450                                                "IPv6 support disabled by administrator");
3451                                 return -EPERM;
3452                         }
3453                 }
3454 #endif
3455
3456                 *lower = lowerdev;
3457         } else {
3458                 if (vxlan_addr_multicast(&conf->remote_ip)) {
3459                         NL_SET_ERR_MSG(extack,
3460                                        "Local interface required for multicast remote destination");
3461
3462                         return -EINVAL;
3463                 }
3464
3465 #if IS_ENABLED(CONFIG_IPV6)
3466                 if (conf->flags & VXLAN_F_IPV6_LINKLOCAL) {
3467                         NL_SET_ERR_MSG(extack,
3468                                        "Local interface required for link-local local/remote addresses");
3469                         return -EINVAL;
3470                 }
3471 #endif
3472
3473                 *lower = NULL;
3474         }
3475
3476         if (!conf->dst_port) {
3477                 if (conf->flags & VXLAN_F_GPE)
3478                         conf->dst_port = htons(4790); /* IANA VXLAN-GPE port */
3479                 else
3480                         conf->dst_port = htons(vxlan_port);
3481         }
3482
3483         if (!conf->age_interval)
3484                 conf->age_interval = FDB_AGE_DEFAULT;
3485
3486         list_for_each_entry(tmp, &vn->vxlan_list, next) {
3487                 if (tmp == old)
3488                         continue;
3489
3490                 if (tmp->cfg.vni != conf->vni)
3491                         continue;
3492                 if (tmp->cfg.dst_port != conf->dst_port)
3493                         continue;
3494                 if ((tmp->cfg.flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)) !=
3495                     (conf->flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)))
3496                         continue;
3497
3498                 if ((conf->flags & VXLAN_F_IPV6_LINKLOCAL) &&
3499                     tmp->cfg.remote_ifindex != conf->remote_ifindex)
3500                         continue;
3501
3502                 NL_SET_ERR_MSG(extack,
3503                                "A VXLAN device with the specified VNI already exists");
3504                 return -EEXIST;
3505         }
3506
3507         return 0;
3508 }
3509
3510 static void vxlan_config_apply(struct net_device *dev,
3511                                struct vxlan_config *conf,
3512                                struct net_device *lowerdev,
3513                                struct net *src_net,
3514                                bool changelink)
3515 {
3516         struct vxlan_dev *vxlan = netdev_priv(dev);
3517         struct vxlan_rdst *dst = &vxlan->default_dst;
3518         unsigned short needed_headroom = ETH_HLEN;
3519         bool use_ipv6 = !!(conf->flags & VXLAN_F_IPV6);
3520         int max_mtu = ETH_MAX_MTU;
3521
3522         if (!changelink) {
3523                 if (conf->flags & VXLAN_F_GPE)
3524                         vxlan_raw_setup(dev);
3525                 else
3526                         vxlan_ether_setup(dev);
3527
3528                 if (conf->mtu)
3529                         dev->mtu = conf->mtu;
3530
3531                 vxlan->net = src_net;
3532         }
3533
3534         dst->remote_vni = conf->vni;
3535
3536         memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
3537
3538         if (lowerdev) {
3539                 dst->remote_ifindex = conf->remote_ifindex;
3540
3541                 dev->gso_max_size = lowerdev->gso_max_size;
3542                 dev->gso_max_segs = lowerdev->gso_max_segs;
3543
3544                 needed_headroom = lowerdev->hard_header_len;
3545
3546                 max_mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM :
3547                                            VXLAN_HEADROOM);
3548                 if (max_mtu < ETH_MIN_MTU)
3549                         max_mtu = ETH_MIN_MTU;
3550
3551                 if (!changelink && !conf->mtu)
3552                         dev->mtu = max_mtu;
3553         }
3554
3555         if (dev->mtu > max_mtu)
3556                 dev->mtu = max_mtu;
3557
3558         if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
3559                 needed_headroom += VXLAN6_HEADROOM;
3560         else
3561                 needed_headroom += VXLAN_HEADROOM;
3562         dev->needed_headroom = needed_headroom;
3563
3564         memcpy(&vxlan->cfg, conf, sizeof(*conf));
3565 }
3566
3567 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
3568                                struct vxlan_config *conf, bool changelink,
3569                                struct netlink_ext_ack *extack)
3570 {
3571         struct vxlan_dev *vxlan = netdev_priv(dev);
3572         struct net_device *lowerdev;
3573         int ret;
3574
3575         ret = vxlan_config_validate(src_net, conf, &lowerdev, vxlan, extack);
3576         if (ret)
3577                 return ret;
3578
3579         vxlan_config_apply(dev, conf, lowerdev, src_net, changelink);
3580
3581         return 0;
3582 }
3583
3584 static int __vxlan_dev_create(struct net *net, struct net_device *dev,
3585                               struct vxlan_config *conf,
3586                               struct netlink_ext_ack *extack)
3587 {
3588         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3589         struct vxlan_dev *vxlan = netdev_priv(dev);
3590         struct net_device *remote_dev = NULL;
3591         struct vxlan_fdb *f = NULL;
3592         bool unregister = false;
3593         struct vxlan_rdst *dst;
3594         int err;
3595
3596         dst = &vxlan->default_dst;
3597         err = vxlan_dev_configure(net, dev, conf, false, extack);
3598         if (err)
3599                 return err;
3600
3601         dev->ethtool_ops = &vxlan_ethtool_ops;
3602
3603         /* create an fdb entry for a valid default destination */
3604         if (!vxlan_addr_any(&dst->remote_ip)) {
3605                 err = vxlan_fdb_create(vxlan, all_zeros_mac,
3606                                        &dst->remote_ip,
3607                                        NUD_REACHABLE | NUD_PERMANENT,
3608                                        vxlan->cfg.dst_port,
3609                                        dst->remote_vni,
3610                                        dst->remote_vni,
3611                                        dst->remote_ifindex,
3612                                        NTF_SELF, &f);
3613                 if (err)
3614                         return err;
3615         }
3616
3617         err = register_netdevice(dev);
3618         if (err)
3619                 goto errout;
3620         unregister = true;
3621
3622         if (dst->remote_ifindex) {
3623                 remote_dev = __dev_get_by_index(net, dst->remote_ifindex);
3624                 if (!remote_dev)
3625                         goto errout;
3626
3627                 err = netdev_upper_dev_link(remote_dev, dev, extack);
3628                 if (err)
3629                         goto errout;
3630         }
3631
3632         err = rtnl_configure_link(dev, NULL);
3633         if (err)
3634                 goto unlink;
3635
3636         if (f) {
3637                 vxlan_fdb_insert(vxlan, all_zeros_mac, dst->remote_vni, f);
3638
3639                 /* notify default fdb entry */
3640                 err = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f),
3641                                        RTM_NEWNEIGH, true, extack);
3642                 if (err) {
3643                         vxlan_fdb_destroy(vxlan, f, false, false);
3644                         if (remote_dev)
3645                                 netdev_upper_dev_unlink(remote_dev, dev);
3646                         goto unregister;
3647                 }
3648         }
3649
3650         list_add(&vxlan->next, &vn->vxlan_list);
3651         if (remote_dev)
3652                 dst->remote_dev = remote_dev;
3653         return 0;
3654 unlink:
3655         if (remote_dev)
3656                 netdev_upper_dev_unlink(remote_dev, dev);
3657 errout:
3658         /* unregister_netdevice() destroys the default FDB entry with deletion
3659          * notification. But the addition notification was not sent yet, so
3660          * destroy the entry by hand here.
3661          */
3662         if (f)
3663                 __vxlan_fdb_free(f);
3664 unregister:
3665         if (unregister)
3666                 unregister_netdevice(dev);
3667         return err;
3668 }
3669
3670 /* Set/clear flags based on attribute */
3671 static int vxlan_nl2flag(struct vxlan_config *conf, struct nlattr *tb[],
3672                           int attrtype, unsigned long mask, bool changelink,
3673                           bool changelink_supported,
3674                           struct netlink_ext_ack *extack)
3675 {
3676         unsigned long flags;
3677
3678         if (!tb[attrtype])
3679                 return 0;
3680
3681         if (changelink && !changelink_supported) {
3682                 vxlan_flag_attr_error(attrtype, extack);
3683                 return -EOPNOTSUPP;
3684         }
3685
3686         if (vxlan_policy[attrtype].type == NLA_FLAG)
3687                 flags = conf->flags | mask;
3688         else if (nla_get_u8(tb[attrtype]))
3689                 flags = conf->flags | mask;
3690         else
3691                 flags = conf->flags & ~mask;
3692
3693         conf->flags = flags;
3694
3695         return 0;
3696 }
3697
3698 static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[],
3699                          struct net_device *dev, struct vxlan_config *conf,
3700                          bool changelink, struct netlink_ext_ack *extack)
3701 {
3702         struct vxlan_dev *vxlan = netdev_priv(dev);
3703         int err = 0;
3704
3705         memset(conf, 0, sizeof(*conf));
3706
3707         /* if changelink operation, start with old existing cfg */
3708         if (changelink)
3709                 memcpy(conf, &vxlan->cfg, sizeof(*conf));
3710
3711         if (data[IFLA_VXLAN_ID]) {
3712                 __be32 vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
3713
3714                 if (changelink && (vni != conf->vni)) {
3715                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_ID], "Cannot change VNI");
3716                         return -EOPNOTSUPP;
3717                 }
3718                 conf->vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
3719         }
3720
3721         if (data[IFLA_VXLAN_GROUP]) {
3722                 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET)) {
3723                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP], "New group address family does not match old group");
3724                         return -EOPNOTSUPP;
3725                 }
3726
3727                 conf->remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
3728                 conf->remote_ip.sa.sa_family = AF_INET;
3729         } else if (data[IFLA_VXLAN_GROUP6]) {
3730                 if (!IS_ENABLED(CONFIG_IPV6)) {
3731                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "IPv6 support not enabled in the kernel");
3732                         return -EPFNOSUPPORT;
3733                 }
3734
3735                 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET6)) {
3736                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "New group address family does not match old group");
3737                         return -EOPNOTSUPP;
3738                 }
3739
3740                 conf->remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
3741                 conf->remote_ip.sa.sa_family = AF_INET6;
3742         }
3743
3744         if (data[IFLA_VXLAN_LOCAL]) {
3745                 if (changelink && (conf->saddr.sa.sa_family != AF_INET)) {
3746                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL], "New local address family does not match old");
3747                         return -EOPNOTSUPP;
3748                 }
3749
3750                 conf->saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
3751                 conf->saddr.sa.sa_family = AF_INET;
3752         } else if (data[IFLA_VXLAN_LOCAL6]) {
3753                 if (!IS_ENABLED(CONFIG_IPV6)) {
3754                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "IPv6 support not enabled in the kernel");
3755                         return -EPFNOSUPPORT;
3756                 }
3757
3758                 if (changelink && (conf->saddr.sa.sa_family != AF_INET6)) {
3759                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "New local address family does not match old");
3760                         return -EOPNOTSUPP;
3761                 }
3762
3763                 /* TODO: respect scope id */
3764                 conf->saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
3765                 conf->saddr.sa.sa_family = AF_INET6;
3766         }
3767
3768         if (data[IFLA_VXLAN_LINK])
3769                 conf->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
3770
3771         if (data[IFLA_VXLAN_TOS])
3772                 conf->tos  = nla_get_u8(data[IFLA_VXLAN_TOS]);
3773
3774         if (data[IFLA_VXLAN_TTL])
3775                 conf->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
3776
3777         if (data[IFLA_VXLAN_TTL_INHERIT]) {
3778                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_TTL_INHERIT,
3779                                     VXLAN_F_TTL_INHERIT, changelink, false,
3780                                     extack);
3781                 if (err)
3782                         return err;
3783
3784         }
3785
3786         if (data[IFLA_VXLAN_LABEL])
3787                 conf->label = nla_get_be32(data[IFLA_VXLAN_LABEL]) &
3788                              IPV6_FLOWLABEL_MASK;
3789
3790         if (data[IFLA_VXLAN_LEARNING]) {
3791                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_LEARNING,
3792                                     VXLAN_F_LEARN, changelink, true,
3793                                     extack);
3794                 if (err)
3795                         return err;
3796         } else if (!changelink) {
3797                 /* default to learn on a new device */
3798                 conf->flags |= VXLAN_F_LEARN;
3799         }
3800
3801         if (data[IFLA_VXLAN_AGEING])
3802                 conf->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
3803
3804         if (data[IFLA_VXLAN_PROXY]) {
3805                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_PROXY,
3806                                     VXLAN_F_PROXY, changelink, false,
3807                                     extack);
3808                 if (err)
3809                         return err;
3810         }
3811
3812         if (data[IFLA_VXLAN_RSC]) {
3813                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_RSC,
3814                                     VXLAN_F_RSC, changelink, false,
3815                                     extack);
3816                 if (err)
3817                         return err;
3818         }
3819
3820         if (data[IFLA_VXLAN_L2MISS]) {
3821                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L2MISS,
3822                                     VXLAN_F_L2MISS, changelink, false,
3823                                     extack);
3824                 if (err)
3825                         return err;
3826         }
3827
3828         if (data[IFLA_VXLAN_L3MISS]) {
3829                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L3MISS,
3830                                     VXLAN_F_L3MISS, changelink, false,
3831                                     extack);
3832                 if (err)
3833                         return err;
3834         }
3835
3836         if (data[IFLA_VXLAN_LIMIT]) {
3837                 if (changelink) {
3838                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LIMIT],
3839                                             "Cannot change limit");
3840                         return -EOPNOTSUPP;
3841                 }
3842                 conf->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
3843         }
3844
3845         if (data[IFLA_VXLAN_COLLECT_METADATA]) {
3846                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_COLLECT_METADATA,
3847                                     VXLAN_F_COLLECT_METADATA, changelink, false,
3848                                     extack);
3849                 if (err)
3850                         return err;
3851         }
3852
3853         if (data[IFLA_VXLAN_PORT_RANGE]) {
3854                 if (!changelink) {
3855                         const struct ifla_vxlan_port_range *p
3856                                 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
3857                         conf->port_min = ntohs(p->low);
3858                         conf->port_max = ntohs(p->high);
3859                 } else {
3860                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT_RANGE],
3861                                             "Cannot change port range");
3862                         return -EOPNOTSUPP;
3863                 }
3864         }
3865
3866         if (data[IFLA_VXLAN_PORT]) {
3867                 if (changelink) {
3868                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT],
3869                                             "Cannot change port");
3870                         return -EOPNOTSUPP;
3871                 }
3872                 conf->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
3873         }
3874
3875         if (data[IFLA_VXLAN_UDP_CSUM]) {
3876                 if (changelink) {
3877                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_UDP_CSUM],
3878                                             "Cannot change UDP_CSUM flag");
3879                         return -EOPNOTSUPP;
3880                 }
3881                 if (!nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
3882                         conf->flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
3883         }
3884
3885         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]) {
3886                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
3887                                     VXLAN_F_UDP_ZERO_CSUM6_TX, changelink,
3888                                     false, extack);
3889                 if (err)
3890                         return err;
3891         }
3892
3893         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]) {
3894                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
3895                                     VXLAN_F_UDP_ZERO_CSUM6_RX, changelink,
3896                                     false, extack);
3897                 if (err)
3898                         return err;
3899         }
3900
3901         if (data[IFLA_VXLAN_REMCSUM_TX]) {
3902                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_TX,
3903                                     VXLAN_F_REMCSUM_TX, changelink, false,
3904                                     extack);
3905                 if (err)
3906                         return err;
3907         }
3908
3909         if (data[IFLA_VXLAN_REMCSUM_RX]) {
3910                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_RX,
3911                                     VXLAN_F_REMCSUM_RX, changelink, false,
3912                                     extack);
3913                 if (err)
3914                         return err;
3915         }
3916
3917         if (data[IFLA_VXLAN_GBP]) {
3918                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GBP,
3919                                     VXLAN_F_GBP, changelink, false, extack);
3920                 if (err)
3921                         return err;
3922         }
3923
3924         if (data[IFLA_VXLAN_GPE]) {
3925                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GPE,
3926                                     VXLAN_F_GPE, changelink, false,
3927                                     extack);
3928                 if (err)
3929                         return err;
3930         }
3931
3932         if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL]) {
3933                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_NOPARTIAL,
3934                                     VXLAN_F_REMCSUM_NOPARTIAL, changelink,
3935                                     false, extack);
3936                 if (err)
3937                         return err;
3938         }
3939
3940         if (tb[IFLA_MTU]) {
3941                 if (changelink) {
3942                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU],
3943                                             "Cannot change mtu");
3944                         return -EOPNOTSUPP;
3945                 }
3946                 conf->mtu = nla_get_u32(tb[IFLA_MTU]);
3947         }
3948
3949         if (data[IFLA_VXLAN_DF])
3950                 conf->df = nla_get_u8(data[IFLA_VXLAN_DF]);
3951
3952         return 0;
3953 }
3954
3955 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
3956                          struct nlattr *tb[], struct nlattr *data[],
3957                          struct netlink_ext_ack *extack)
3958 {
3959         struct vxlan_config conf;
3960         int err;
3961
3962         err = vxlan_nl2conf(tb, data, dev, &conf, false, extack);
3963         if (err)
3964                 return err;
3965
3966         return __vxlan_dev_create(src_net, dev, &conf, extack);
3967 }
3968
3969 static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[],
3970                             struct nlattr *data[],
3971                             struct netlink_ext_ack *extack)
3972 {
3973         struct vxlan_dev *vxlan = netdev_priv(dev);
3974         struct net_device *lowerdev;
3975         struct vxlan_config conf;
3976         struct vxlan_rdst *dst;
3977         int err;
3978
3979         dst = &vxlan->default_dst;
3980         err = vxlan_nl2conf(tb, data, dev, &conf, true, extack);
3981         if (err)
3982                 return err;
3983
3984         err = vxlan_config_validate(vxlan->net, &conf, &lowerdev,
3985                                     vxlan, extack);
3986         if (err)
3987                 return err;
3988
3989         if (dst->remote_dev == lowerdev)
3990                 lowerdev = NULL;
3991
3992         err = netdev_adjacent_change_prepare(dst->remote_dev, lowerdev, dev,
3993                                              extack);
3994         if (err)
3995                 return err;
3996
3997         /* handle default dst entry */
3998         if (!vxlan_addr_equal(&conf.remote_ip, &dst->remote_ip)) {
3999                 u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, conf.vni);
4000
4001                 spin_lock_bh(&vxlan->hash_lock[hash_index]);
4002                 if (!vxlan_addr_any(&conf.remote_ip)) {
4003                         err = vxlan_fdb_update(vxlan, all_zeros_mac,
4004                                                &conf.remote_ip,
4005                                                NUD_REACHABLE | NUD_PERMANENT,
4006                                                NLM_F_APPEND | NLM_F_CREATE,
4007                                                vxlan->cfg.dst_port,
4008                                                conf.vni, conf.vni,
4009                                                conf.remote_ifindex,
4010                                                NTF_SELF, true, extack);
4011                         if (err) {
4012                                 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4013                                 netdev_adjacent_change_abort(dst->remote_dev,
4014                                                              lowerdev, dev);
4015                                 return err;
4016                         }
4017                 }
4018                 if (!vxlan_addr_any(&dst->remote_ip))
4019                         __vxlan_fdb_delete(vxlan, all_zeros_mac,
4020                                            dst->remote_ip,
4021                                            vxlan->cfg.dst_port,
4022                                            dst->remote_vni,
4023                                            dst->remote_vni,
4024                                            dst->remote_ifindex,
4025                                            true);
4026                 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4027         }
4028
4029         if (conf.age_interval != vxlan->cfg.age_interval)
4030                 mod_timer(&vxlan->age_timer, jiffies);
4031
4032         netdev_adjacent_change_commit(dst->remote_dev, lowerdev, dev);
4033         if (lowerdev && lowerdev != dst->remote_dev) {
4034                 dst->remote_dev = lowerdev;
4035                 netdev_update_lockdep_key(lowerdev);
4036         }
4037         vxlan_config_apply(dev, &conf, lowerdev, vxlan->net, true);
4038         return 0;
4039 }
4040
4041 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
4042 {
4043         struct vxlan_dev *vxlan = netdev_priv(dev);
4044
4045         vxlan_flush(vxlan, true);
4046
4047         list_del(&vxlan->next);
4048         unregister_netdevice_queue(dev, head);
4049         if (vxlan->default_dst.remote_dev)
4050                 netdev_upper_dev_unlink(vxlan->default_dst.remote_dev, dev);
4051 }
4052
4053 static size_t vxlan_get_size(const struct net_device *dev)
4054 {
4055
4056         return nla_total_size(sizeof(__u32)) +  /* IFLA_VXLAN_ID */
4057                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
4058                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
4059                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
4060                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TTL */
4061                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TTL_INHERIT */
4062                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TOS */
4063                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_DF */
4064                 nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */
4065                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_LEARNING */
4066                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_PROXY */
4067                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_RSC */
4068                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L2MISS */
4069                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L3MISS */
4070                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_COLLECT_METADATA */
4071                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
4072                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
4073                 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
4074                 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
4075                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
4076                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
4077                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
4078                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
4079                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
4080                 0;
4081 }
4082
4083 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
4084 {
4085         const struct vxlan_dev *vxlan = netdev_priv(dev);
4086         const struct vxlan_rdst *dst = &vxlan->default_dst;
4087         struct ifla_vxlan_port_range ports = {
4088                 .low =  htons(vxlan->cfg.port_min),
4089                 .high = htons(vxlan->cfg.port_max),
4090         };
4091
4092         if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni)))
4093                 goto nla_put_failure;
4094
4095         if (!vxlan_addr_any(&dst->remote_ip)) {
4096                 if (dst->remote_ip.sa.sa_family == AF_INET) {
4097                         if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
4098                                             dst->remote_ip.sin.sin_addr.s_addr))
4099                                 goto nla_put_failure;
4100 #if IS_ENABLED(CONFIG_IPV6)
4101                 } else {
4102                         if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
4103                                              &dst->remote_ip.sin6.sin6_addr))
4104                                 goto nla_put_failure;
4105 #endif
4106                 }
4107         }
4108
4109         if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
4110                 goto nla_put_failure;
4111
4112         if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
4113                 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
4114                         if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
4115                                             vxlan->cfg.saddr.sin.sin_addr.s_addr))
4116                                 goto nla_put_failure;
4117 #if IS_ENABLED(CONFIG_IPV6)
4118                 } else {
4119                         if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
4120                                              &vxlan->cfg.saddr.sin6.sin6_addr))
4121                                 goto nla_put_failure;
4122 #endif
4123                 }
4124         }
4125
4126         if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
4127             nla_put_u8(skb, IFLA_VXLAN_TTL_INHERIT,
4128                        !!(vxlan->cfg.flags & VXLAN_F_TTL_INHERIT)) ||
4129             nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
4130             nla_put_u8(skb, IFLA_VXLAN_DF, vxlan->cfg.df) ||
4131             nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) ||
4132             nla_put_u8(skb, IFLA_VXLAN_LEARNING,
4133                         !!(vxlan->cfg.flags & VXLAN_F_LEARN)) ||
4134             nla_put_u8(skb, IFLA_VXLAN_PROXY,
4135                         !!(vxlan->cfg.flags & VXLAN_F_PROXY)) ||
4136             nla_put_u8(skb, IFLA_VXLAN_RSC,
4137                        !!(vxlan->cfg.flags & VXLAN_F_RSC)) ||
4138             nla_put_u8(skb, IFLA_VXLAN_L2MISS,
4139                         !!(vxlan->cfg.flags & VXLAN_F_L2MISS)) ||
4140             nla_put_u8(skb, IFLA_VXLAN_L3MISS,
4141                         !!(vxlan->cfg.flags & VXLAN_F_L3MISS)) ||
4142             nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
4143                        !!(vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)) ||
4144             nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
4145             nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
4146             nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
4147             nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
4148                         !(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
4149             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
4150                         !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
4151             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
4152                         !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
4153             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
4154                         !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_TX)) ||
4155             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
4156                         !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_RX)))
4157                 goto nla_put_failure;
4158
4159         if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
4160                 goto nla_put_failure;
4161
4162         if (vxlan->cfg.flags & VXLAN_F_GBP &&
4163             nla_put_flag(skb, IFLA_VXLAN_GBP))
4164                 goto nla_put_failure;
4165
4166         if (vxlan->cfg.flags & VXLAN_F_GPE &&
4167             nla_put_flag(skb, IFLA_VXLAN_GPE))
4168                 goto nla_put_failure;
4169
4170         if (vxlan->cfg.flags & VXLAN_F_REMCSUM_NOPARTIAL &&
4171             nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
4172                 goto nla_put_failure;
4173
4174         return 0;
4175
4176 nla_put_failure:
4177         return -EMSGSIZE;
4178 }
4179
4180 static struct net *vxlan_get_link_net(const struct net_device *dev)
4181 {
4182         struct vxlan_dev *vxlan = netdev_priv(dev);
4183
4184         return vxlan->net;
4185 }
4186
4187 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
4188         .kind           = "vxlan",
4189         .maxtype        = IFLA_VXLAN_MAX,
4190         .policy         = vxlan_policy,
4191         .priv_size      = sizeof(struct vxlan_dev),
4192         .setup          = vxlan_setup,
4193         .validate       = vxlan_validate,
4194         .newlink        = vxlan_newlink,
4195         .changelink     = vxlan_changelink,
4196         .dellink        = vxlan_dellink,
4197         .get_size       = vxlan_get_size,
4198         .fill_info      = vxlan_fill_info,
4199         .get_link_net   = vxlan_get_link_net,
4200 };
4201
4202 struct net_device *vxlan_dev_create(struct net *net, const char *name,
4203                                     u8 name_assign_type,
4204                                     struct vxlan_config *conf)
4205 {
4206         struct nlattr *tb[IFLA_MAX + 1];
4207         struct net_device *dev;
4208         int err;
4209
4210         memset(&tb, 0, sizeof(tb));
4211
4212         dev = rtnl_create_link(net, name, name_assign_type,
4213                                &vxlan_link_ops, tb, NULL);
4214         if (IS_ERR(dev))
4215                 return dev;
4216
4217         err = __vxlan_dev_create(net, dev, conf, NULL);
4218         if (err < 0) {
4219                 free_netdev(dev);
4220                 return ERR_PTR(err);
4221         }
4222
4223         err = rtnl_configure_link(dev, NULL);
4224         if (err < 0) {
4225                 LIST_HEAD(list_kill);
4226
4227                 vxlan_dellink(dev, &list_kill);
4228                 unregister_netdevice_many(&list_kill);
4229                 return ERR_PTR(err);
4230         }
4231
4232         return dev;
4233 }
4234 EXPORT_SYMBOL_GPL(vxlan_dev_create);
4235
4236 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
4237                                              struct net_device *dev)
4238 {
4239         struct vxlan_dev *vxlan, *next;
4240         LIST_HEAD(list_kill);
4241
4242         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
4243                 struct vxlan_rdst *dst = &vxlan->default_dst;
4244
4245                 /* In case we created vxlan device with carrier
4246                  * and we loose the carrier due to module unload
4247                  * we also need to remove vxlan device. In other
4248                  * cases, it's not necessary and remote_ifindex
4249                  * is 0 here, so no matches.
4250                  */
4251                 if (dst->remote_ifindex == dev->ifindex)
4252                         vxlan_dellink(vxlan->dev, &list_kill);
4253         }
4254
4255         unregister_netdevice_many(&list_kill);
4256 }
4257
4258 static int vxlan_netdevice_event(struct notifier_block *unused,
4259                                  unsigned long event, void *ptr)
4260 {
4261         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4262         struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
4263
4264         if (event == NETDEV_UNREGISTER) {
4265                 vxlan_offload_rx_ports(dev, false);
4266                 vxlan_handle_lowerdev_unregister(vn, dev);
4267         } else if (event == NETDEV_REGISTER) {
4268                 vxlan_offload_rx_ports(dev, true);
4269         } else if (event == NETDEV_UDP_TUNNEL_PUSH_INFO ||
4270                    event == NETDEV_UDP_TUNNEL_DROP_INFO) {
4271                 vxlan_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO);
4272         }
4273
4274         return NOTIFY_DONE;
4275 }
4276
4277 static struct notifier_block vxlan_notifier_block __read_mostly = {
4278         .notifier_call = vxlan_netdevice_event,
4279 };
4280
4281 static void
4282 vxlan_fdb_offloaded_set(struct net_device *dev,
4283                         struct switchdev_notifier_vxlan_fdb_info *fdb_info)
4284 {
4285         struct vxlan_dev *vxlan = netdev_priv(dev);
4286         struct vxlan_rdst *rdst;
4287         struct vxlan_fdb *f;
4288         u32 hash_index;
4289
4290         hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
4291
4292         spin_lock_bh(&vxlan->hash_lock[hash_index]);
4293
4294         f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni);
4295         if (!f)
4296                 goto out;
4297
4298         rdst = vxlan_fdb_find_rdst(f, &fdb_info->remote_ip,
4299                                    fdb_info->remote_port,
4300                                    fdb_info->remote_vni,
4301                                    fdb_info->remote_ifindex);
4302         if (!rdst)
4303                 goto out;
4304
4305         rdst->offloaded = fdb_info->offloaded;
4306
4307 out:
4308         spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4309 }
4310
4311 static int
4312 vxlan_fdb_external_learn_add(struct net_device *dev,
4313                              struct switchdev_notifier_vxlan_fdb_info *fdb_info)
4314 {
4315         struct vxlan_dev *vxlan = netdev_priv(dev);
4316         struct netlink_ext_ack *extack;
4317         u32 hash_index;
4318         int err;
4319
4320         hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
4321         extack = switchdev_notifier_info_to_extack(&fdb_info->info);
4322
4323         spin_lock_bh(&vxlan->hash_lock[hash_index]);
4324         err = vxlan_fdb_update(vxlan, fdb_info->eth_addr, &fdb_info->remote_ip,
4325                                NUD_REACHABLE,
4326                                NLM_F_CREATE | NLM_F_REPLACE,
4327                                fdb_info->remote_port,
4328                                fdb_info->vni,
4329                                fdb_info->remote_vni,
4330                                fdb_info->remote_ifindex,
4331                                NTF_USE | NTF_SELF | NTF_EXT_LEARNED,
4332                                false, extack);
4333         spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4334
4335         return err;
4336 }
4337
4338 static int
4339 vxlan_fdb_external_learn_del(struct net_device *dev,
4340                              struct switchdev_notifier_vxlan_fdb_info *fdb_info)
4341 {
4342         struct vxlan_dev *vxlan = netdev_priv(dev);
4343         struct vxlan_fdb *f;
4344         u32 hash_index;
4345         int err = 0;
4346
4347         hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
4348         spin_lock_bh(&vxlan->hash_lock[hash_index]);
4349
4350         f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni);
4351         if (!f)
4352                 err = -ENOENT;
4353         else if (f->flags & NTF_EXT_LEARNED)
4354                 err = __vxlan_fdb_delete(vxlan, fdb_info->eth_addr,
4355                                          fdb_info->remote_ip,
4356                                          fdb_info->remote_port,
4357                                          fdb_info->vni,
4358                                          fdb_info->remote_vni,
4359                                          fdb_info->remote_ifindex,
4360                                          false);
4361
4362         spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4363
4364         return err;
4365 }
4366
4367 static int vxlan_switchdev_event(struct notifier_block *unused,
4368                                  unsigned long event, void *ptr)
4369 {
4370         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
4371         struct switchdev_notifier_vxlan_fdb_info *fdb_info;
4372         int err = 0;
4373
4374         switch (event) {
4375         case SWITCHDEV_VXLAN_FDB_OFFLOADED:
4376                 vxlan_fdb_offloaded_set(dev, ptr);
4377                 break;
4378         case SWITCHDEV_VXLAN_FDB_ADD_TO_BRIDGE:
4379                 fdb_info = ptr;
4380                 err = vxlan_fdb_external_learn_add(dev, fdb_info);
4381                 if (err) {
4382                         err = notifier_from_errno(err);
4383                         break;
4384                 }
4385                 fdb_info->offloaded = true;
4386                 vxlan_fdb_offloaded_set(dev, fdb_info);
4387                 break;
4388         case SWITCHDEV_VXLAN_FDB_DEL_TO_BRIDGE:
4389                 fdb_info = ptr;
4390                 err = vxlan_fdb_external_learn_del(dev, fdb_info);
4391                 if (err) {
4392                         err = notifier_from_errno(err);
4393                         break;
4394                 }
4395                 fdb_info->offloaded = false;
4396                 vxlan_fdb_offloaded_set(dev, fdb_info);
4397                 break;
4398         }
4399
4400         return err;
4401 }
4402
4403 static struct notifier_block vxlan_switchdev_notifier_block __read_mostly = {
4404         .notifier_call = vxlan_switchdev_event,
4405 };
4406
4407 static __net_init int vxlan_init_net(struct net *net)
4408 {
4409         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
4410         unsigned int h;
4411
4412         INIT_LIST_HEAD(&vn->vxlan_list);
4413         spin_lock_init(&vn->sock_lock);
4414
4415         for (h = 0; h < PORT_HASH_SIZE; ++h)
4416                 INIT_HLIST_HEAD(&vn->sock_list[h]);
4417
4418         return 0;
4419 }
4420
4421 static void vxlan_destroy_tunnels(struct net *net, struct list_head *head)
4422 {
4423         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
4424         struct vxlan_dev *vxlan, *next;
4425         struct net_device *dev, *aux;
4426         unsigned int h;
4427
4428         for_each_netdev_safe(net, dev, aux)
4429                 if (dev->rtnl_link_ops == &vxlan_link_ops)
4430                         unregister_netdevice_queue(dev, head);
4431
4432         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
4433                 /* If vxlan->dev is in the same netns, it has already been added
4434                  * to the list by the previous loop.
4435                  */
4436                 if (!net_eq(dev_net(vxlan->dev), net))
4437                         unregister_netdevice_queue(vxlan->dev, head);
4438         }
4439
4440         for (h = 0; h < PORT_HASH_SIZE; ++h)
4441                 WARN_ON_ONCE(!hlist_empty(&vn->sock_list[h]));
4442 }
4443
4444 static void __net_exit vxlan_exit_batch_net(struct list_head *net_list)
4445 {
4446         struct net *net;
4447         LIST_HEAD(list);
4448
4449         rtnl_lock();
4450         list_for_each_entry(net, net_list, exit_list)
4451                 vxlan_destroy_tunnels(net, &list);
4452
4453         unregister_netdevice_many(&list);
4454         rtnl_unlock();
4455 }
4456
4457 static struct pernet_operations vxlan_net_ops = {
4458         .init = vxlan_init_net,
4459         .exit_batch = vxlan_exit_batch_net,
4460         .id   = &vxlan_net_id,
4461         .size = sizeof(struct vxlan_net),
4462 };
4463
4464 static int __init vxlan_init_module(void)
4465 {
4466         int rc;
4467
4468         get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
4469
4470         rc = register_pernet_subsys(&vxlan_net_ops);
4471         if (rc)
4472                 goto out1;
4473
4474         rc = register_netdevice_notifier(&vxlan_notifier_block);
4475         if (rc)
4476                 goto out2;
4477
4478         rc = register_switchdev_notifier(&vxlan_switchdev_notifier_block);
4479         if (rc)
4480                 goto out3;
4481
4482         rc = rtnl_link_register(&vxlan_link_ops);
4483         if (rc)
4484                 goto out4;
4485
4486         return 0;
4487 out4:
4488         unregister_switchdev_notifier(&vxlan_switchdev_notifier_block);
4489 out3:
4490         unregister_netdevice_notifier(&vxlan_notifier_block);
4491 out2:
4492         unregister_pernet_subsys(&vxlan_net_ops);
4493 out1:
4494         return rc;
4495 }
4496 late_initcall(vxlan_init_module);
4497
4498 static void __exit vxlan_cleanup_module(void)
4499 {
4500         rtnl_link_unregister(&vxlan_link_ops);
4501         unregister_switchdev_notifier(&vxlan_switchdev_notifier_block);
4502         unregister_netdevice_notifier(&vxlan_notifier_block);
4503         unregister_pernet_subsys(&vxlan_net_ops);
4504         /* rcu_barrier() is called by netns */
4505 }
4506 module_exit(vxlan_cleanup_module);
4507
4508 MODULE_LICENSE("GPL");
4509 MODULE_VERSION(VXLAN_VERSION);
4510 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
4511 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
4512 MODULE_ALIAS_RTNL_LINK("vxlan");