drivers/net/vxlan.c

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