drivers/net/geneve.c

   1 /*
   2  * GENEVE: Generic Network Virtualization Encapsulation
   3  *
   4  * Copyright (c) 2015 Red Hat, 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/etherdevice.h>
  16 #include <linux/hash.h>
  17 #include <net/dst_metadata.h>
  18 #include <net/gro_cells.h>
  19 #include <net/rtnetlink.h>
  20 #include <net/geneve.h>
  21 #include <net/protocol.h>
  22
  23 #define GENEVE_NETDEV_VER       "0.6"
  24
  25 #define GENEVE_UDP_PORT         6081
  26
  27 #define GENEVE_N_VID            (1u << 24)
  28 #define GENEVE_VID_MASK         (GENEVE_N_VID - 1)
  29
  30 #define VNI_HASH_BITS           10
  31 #define VNI_HASH_SIZE           (1<<VNI_HASH_BITS)
  32
  33 static bool log_ecn_error = true;
  34 module_param(log_ecn_error, bool, 0644);
  35 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
  36
  37 #define GENEVE_VER 0
  38 #define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr))
  39
  40 /* per-network namespace private data for this module */
  41 struct geneve_net {
  42         struct list_head        geneve_list;
  43         struct list_head        sock_list;
  44 };
  45
  46 static unsigned int geneve_net_id;
  47
  48 /* Pseudo network device */
  49 struct geneve_dev {
  50         struct hlist_node  hlist;       /* vni hash table */
  51         struct net         *net;        /* netns for packet i/o */
  52         struct net_device  *dev;        /* netdev for geneve tunnel */
  53         struct ip_tunnel_info info;
  54         struct geneve_sock __rcu *sock4;        /* IPv4 socket used for geneve tunnel */
  55 #if IS_ENABLED(CONFIG_IPV6)
  56         struct geneve_sock __rcu *sock6;        /* IPv6 socket used for geneve tunnel */
  57 #endif
  58         struct list_head   next;        /* geneve's per namespace list */
  59         struct gro_cells   gro_cells;
  60         bool               collect_md;
  61         bool               use_udp6_rx_checksums;
  62 };
  63
  64 struct geneve_sock {
  65         bool                    collect_md;
  66         struct list_head        list;
  67         struct socket           *sock;
  68         struct rcu_head         rcu;
  69         int                     refcnt;
  70         struct hlist_head       vni_list[VNI_HASH_SIZE];
  71 };
  72
  73 static inline __u32 geneve_net_vni_hash(u8 vni[3])
  74 {
  75         __u32 vnid;
  76
  77         vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2];
  78         return hash_32(vnid, VNI_HASH_BITS);
  79 }
  80
  81 static __be64 vni_to_tunnel_id(const __u8 *vni)
  82 {
  83 #ifdef __BIG_ENDIAN
  84         return (vni[0] << 16) | (vni[1] << 8) | vni[2];
  85 #else
  86         return (__force __be64)(((__force u64)vni[0] << 40) |
  87                                 ((__force u64)vni[1] << 48) |
  88                                 ((__force u64)vni[2] << 56));
  89 #endif
  90 }
  91
  92 /* Convert 64 bit tunnel ID to 24 bit VNI. */
  93 static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni)
  94 {
  95 #ifdef __BIG_ENDIAN
  96         vni[0] = (__force __u8)(tun_id >> 16);
  97         vni[1] = (__force __u8)(tun_id >> 8);
  98         vni[2] = (__force __u8)tun_id;
  99 #else
 100         vni[0] = (__force __u8)((__force u64)tun_id >> 40);
 101         vni[1] = (__force __u8)((__force u64)tun_id >> 48);
 102         vni[2] = (__force __u8)((__force u64)tun_id >> 56);
 103 #endif
 104 }
 105
 106 static bool eq_tun_id_and_vni(u8 *tun_id, u8 *vni)
 107 {
 108 #ifdef __BIG_ENDIAN
 109         return (vni[0] == tun_id[2]) &&
 110                (vni[1] == tun_id[1]) &&
 111                (vni[2] == tun_id[0]);
 112 #else
 113         return !memcmp(vni, &tun_id[5], 3);
 114 #endif
 115 }
 116
 117 static sa_family_t geneve_get_sk_family(struct geneve_sock *gs)
 118 {
 119         return gs->sock->sk->sk_family;
 120 }
 121
 122 static struct geneve_dev *geneve_lookup(struct geneve_sock *gs,
 123                                         __be32 addr, u8 vni[])
 124 {
 125         struct hlist_head *vni_list_head;
 126         struct geneve_dev *geneve;
 127         __u32 hash;
 128
 129         /* Find the device for this VNI */
 130         hash = geneve_net_vni_hash(vni);
 131         vni_list_head = &gs->vni_list[hash];
 132         hlist_for_each_entry_rcu(geneve, vni_list_head, hlist) {
 133                 if (eq_tun_id_and_vni((u8 *)&geneve->info.key.tun_id, vni) &&
 134                     addr == geneve->info.key.u.ipv4.dst)
 135                         return geneve;
 136         }
 137         return NULL;
 138 }
 139
 140 #if IS_ENABLED(CONFIG_IPV6)
 141 static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs,
 142                                          struct in6_addr addr6, u8 vni[])
 143 {
 144         struct hlist_head *vni_list_head;
 145         struct geneve_dev *geneve;
 146         __u32 hash;
 147
 148         /* Find the device for this VNI */
 149         hash = geneve_net_vni_hash(vni);
 150         vni_list_head = &gs->vni_list[hash];
 151         hlist_for_each_entry_rcu(geneve, vni_list_head, hlist) {
 152                 if (eq_tun_id_and_vni((u8 *)&geneve->info.key.tun_id, vni) &&
 153                     ipv6_addr_equal(&addr6, &geneve->info.key.u.ipv6.dst))
 154                         return geneve;
 155         }
 156         return NULL;
 157 }
 158 #endif
 159
 160 static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
 161 {
 162         return (struct genevehdr *)(udp_hdr(skb) + 1);
 163 }
 164
 165 static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs,
 166                                             struct sk_buff *skb)
 167 {
 168         static u8 zero_vni[3];
 169         u8 *vni;
 170
 171         if (geneve_get_sk_family(gs) == AF_INET) {
 172                 struct iphdr *iph;
 173                 __be32 addr;
 174
 175                 iph = ip_hdr(skb); /* outer IP header... */
 176
 177                 if (gs->collect_md) {
 178                         vni = zero_vni;
 179                         addr = 0;
 180                 } else {
 181                         vni = geneve_hdr(skb)->vni;
 182                         addr = iph->saddr;
 183                 }
 184
 185                 return geneve_lookup(gs, addr, vni);
 186 #if IS_ENABLED(CONFIG_IPV6)
 187         } else if (geneve_get_sk_family(gs) == AF_INET6) {
 188                 static struct in6_addr zero_addr6;
 189                 struct ipv6hdr *ip6h;
 190                 struct in6_addr addr6;
 191
 192                 ip6h = ipv6_hdr(skb); /* outer IPv6 header... */
 193
 194                 if (gs->collect_md) {
 195                         vni = zero_vni;
 196                         addr6 = zero_addr6;
 197                 } else {
 198                         vni = geneve_hdr(skb)->vni;
 199                         addr6 = ip6h->saddr;
 200                 }
 201
 202                 return geneve6_lookup(gs, addr6, vni);
 203 #endif
 204         }
 205         return NULL;
 206 }
 207
 208 /* geneve receive/decap routine */
 209 static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs,
 210                       struct sk_buff *skb)
 211 {
 212         struct genevehdr *gnvh = geneve_hdr(skb);
 213         struct metadata_dst *tun_dst = NULL;
 214         struct pcpu_sw_netstats *stats;
 215         unsigned int len;
 216         int err = 0;
 217         void *oiph;
 218
 219         if (ip_tunnel_collect_metadata() || gs->collect_md) {
 220                 __be16 flags;
 221
 222                 flags = TUNNEL_KEY | TUNNEL_GENEVE_OPT |
 223                         (gnvh->oam ? TUNNEL_OAM : 0) |
 224                         (gnvh->critical ? TUNNEL_CRIT_OPT : 0);
 225
 226                 tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags,
 227                                          vni_to_tunnel_id(gnvh->vni),
 228                                          gnvh->opt_len * 4);
 229                 if (!tun_dst) {
 230                         geneve->dev->stats.rx_dropped++;
 231                         goto drop;
 232                 }
 233                 /* Update tunnel dst according to Geneve options. */
 234                 ip_tunnel_info_opts_set(&tun_dst->u.tun_info,
 235                                         gnvh->options, gnvh->opt_len * 4);
 236         } else {
 237                 /* Drop packets w/ critical options,
 238                  * since we don't support any...
 239                  */
 240                 if (gnvh->critical) {
 241                         geneve->dev->stats.rx_frame_errors++;
 242                         geneve->dev->stats.rx_errors++;
 243                         goto drop;
 244                 }
 245         }
 246
 247         skb_reset_mac_header(skb);
 248         skb->protocol = eth_type_trans(skb, geneve->dev);
 249         skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
 250
 251         if (tun_dst)
 252                 skb_dst_set(skb, &tun_dst->dst);
 253
 254         /* Ignore packet loops (and multicast echo) */
 255         if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr)) {
 256                 geneve->dev->stats.rx_errors++;
 257                 goto drop;
 258         }
 259
 260         oiph = skb_network_header(skb);
 261         skb_reset_network_header(skb);
 262
 263         if (geneve_get_sk_family(gs) == AF_INET)
 264                 err = IP_ECN_decapsulate(oiph, skb);
 265 #if IS_ENABLED(CONFIG_IPV6)
 266         else
 267                 err = IP6_ECN_decapsulate(oiph, skb);
 268 #endif
 269
 270         if (unlikely(err)) {
 271                 if (log_ecn_error) {
 272                         if (geneve_get_sk_family(gs) == AF_INET)
 273                                 net_info_ratelimited("non-ECT from %pI4 "
 274                                                      "with TOS=%#x\n",
 275                                                      &((struct iphdr *)oiph)->saddr,
 276                                                      ((struct iphdr *)oiph)->tos);
 277 #if IS_ENABLED(CONFIG_IPV6)
 278                         else
 279                                 net_info_ratelimited("non-ECT from %pI6\n",
 280                                                      &((struct ipv6hdr *)oiph)->saddr);
 281 #endif
 282                 }
 283                 if (err > 1) {
 284                         ++geneve->dev->stats.rx_frame_errors;
 285                         ++geneve->dev->stats.rx_errors;
 286                         goto drop;
 287                 }
 288         }
 289
 290         len = skb->len;
 291         err = gro_cells_receive(&geneve->gro_cells, skb);
 292         if (likely(err == NET_RX_SUCCESS)) {
 293                 stats = this_cpu_ptr(geneve->dev->tstats);
 294                 u64_stats_update_begin(&stats->syncp);
 295                 stats->rx_packets++;
 296                 stats->rx_bytes += len;
 297                 u64_stats_update_end(&stats->syncp);
 298         }
 299         return;
 300 drop:
 301         /* Consume bad packet */
 302         kfree_skb(skb);
 303 }
 304
 305 /* Setup stats when device is created */
 306 static int geneve_init(struct net_device *dev)
 307 {
 308         struct geneve_dev *geneve = netdev_priv(dev);
 309         int err;
 310
 311         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
 312         if (!dev->tstats)
 313                 return -ENOMEM;
 314
 315         err = gro_cells_init(&geneve->gro_cells, dev);
 316         if (err) {
 317                 free_percpu(dev->tstats);
 318                 return err;
 319         }
 320
 321         err = dst_cache_init(&geneve->info.dst_cache, GFP_KERNEL);
 322         if (err) {
 323                 free_percpu(dev->tstats);
 324                 gro_cells_destroy(&geneve->gro_cells);
 325                 return err;
 326         }
 327         return 0;
 328 }
 329
 330 static void geneve_uninit(struct net_device *dev)
 331 {
 332         struct geneve_dev *geneve = netdev_priv(dev);
 333
 334         dst_cache_destroy(&geneve->info.dst_cache);
 335         gro_cells_destroy(&geneve->gro_cells);
 336         free_percpu(dev->tstats);
 337 }
 338
 339 /* Callback from net/ipv4/udp.c to receive packets */
 340 static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
 341 {
 342         struct genevehdr *geneveh;
 343         struct geneve_dev *geneve;
 344         struct geneve_sock *gs;
 345         int opts_len;
 346
 347         /* Need UDP and Geneve header to be present */
 348         if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
 349                 goto drop;
 350
 351         /* Return packets with reserved bits set */
 352         geneveh = geneve_hdr(skb);
 353         if (unlikely(geneveh->ver != GENEVE_VER))
 354                 goto drop;
 355
 356         if (unlikely(geneveh->proto_type != htons(ETH_P_TEB)))
 357                 goto drop;
 358
 359         gs = rcu_dereference_sk_user_data(sk);
 360         if (!gs)
 361                 goto drop;
 362
 363         geneve = geneve_lookup_skb(gs, skb);
 364         if (!geneve)
 365                 goto drop;
 366
 367         opts_len = geneveh->opt_len * 4;
 368         if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len,
 369                                  htons(ETH_P_TEB),
 370                                  !net_eq(geneve->net, dev_net(geneve->dev)))) {
 371                 geneve->dev->stats.rx_dropped++;
 372                 goto drop;
 373         }
 374
 375         geneve_rx(geneve, gs, skb);
 376         return 0;
 377
 378 drop:
 379         /* Consume bad packet */
 380         kfree_skb(skb);
 381         return 0;
 382 }
 383
 384 static struct socket *geneve_create_sock(struct net *net, bool ipv6,
 385                                          __be16 port, bool ipv6_rx_csum)
 386 {
 387         struct socket *sock;
 388         struct udp_port_cfg udp_conf;
 389         int err;
 390
 391         memset(&udp_conf, 0, sizeof(udp_conf));
 392
 393         if (ipv6) {
 394                 udp_conf.family = AF_INET6;
 395                 udp_conf.ipv6_v6only = 1;
 396                 udp_conf.use_udp6_rx_checksums = ipv6_rx_csum;
 397         } else {
 398                 udp_conf.family = AF_INET;
 399                 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
 400         }
 401
 402         udp_conf.local_udp_port = port;
 403
 404         /* Open UDP socket */
 405         err = udp_sock_create(net, &udp_conf, &sock);
 406         if (err < 0)
 407                 return ERR_PTR(err);
 408
 409         return sock;
 410 }
 411
 412 static int geneve_hlen(struct genevehdr *gh)
 413 {
 414         return sizeof(*gh) + gh->opt_len * 4;
 415 }
 416
 417 static struct sk_buff **geneve_gro_receive(struct sock *sk,
 418                                            struct sk_buff **head,
 419                                            struct sk_buff *skb)
 420 {
 421         struct sk_buff *p, **pp = NULL;
 422         struct genevehdr *gh, *gh2;
 423         unsigned int hlen, gh_len, off_gnv;
 424         const struct packet_offload *ptype;
 425         __be16 type;
 426         int flush = 1;
 427
 428         off_gnv = skb_gro_offset(skb);
 429         hlen = off_gnv + sizeof(*gh);
 430         gh = skb_gro_header_fast(skb, off_gnv);
 431         if (skb_gro_header_hard(skb, hlen)) {
 432                 gh = skb_gro_header_slow(skb, hlen, off_gnv);
 433                 if (unlikely(!gh))
 434                         goto out;
 435         }
 436
 437         if (gh->ver != GENEVE_VER || gh->oam)
 438                 goto out;
 439         gh_len = geneve_hlen(gh);
 440
 441         hlen = off_gnv + gh_len;
 442         if (skb_gro_header_hard(skb, hlen)) {
 443                 gh = skb_gro_header_slow(skb, hlen, off_gnv);
 444                 if (unlikely(!gh))
 445                         goto out;
 446         }
 447
 448         for (p = *head; p; p = p->next) {
 449                 if (!NAPI_GRO_CB(p)->same_flow)
 450                         continue;
 451
 452                 gh2 = (struct genevehdr *)(p->data + off_gnv);
 453                 if (gh->opt_len != gh2->opt_len ||
 454                     memcmp(gh, gh2, gh_len)) {
 455                         NAPI_GRO_CB(p)->same_flow = 0;
 456                         continue;
 457                 }
 458         }
 459
 460         type = gh->proto_type;
 461
 462         rcu_read_lock();
 463         ptype = gro_find_receive_by_type(type);
 464         if (!ptype)
 465                 goto out_unlock;
 466
 467         skb_gro_pull(skb, gh_len);
 468         skb_gro_postpull_rcsum(skb, gh, gh_len);
 469         pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
 470         flush = 0;
 471
 472 out_unlock:
 473         rcu_read_unlock();
 474 out:
 475         NAPI_GRO_CB(skb)->flush |= flush;
 476
 477         return pp;
 478 }
 479
 480 static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb,
 481                                int nhoff)
 482 {
 483         struct genevehdr *gh;
 484         struct packet_offload *ptype;
 485         __be16 type;
 486         int gh_len;
 487         int err = -ENOSYS;
 488
 489         gh = (struct genevehdr *)(skb->data + nhoff);
 490         gh_len = geneve_hlen(gh);
 491         type = gh->proto_type;
 492
 493         rcu_read_lock();
 494         ptype = gro_find_complete_by_type(type);
 495         if (ptype)
 496                 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
 497
 498         rcu_read_unlock();
 499
 500         skb_set_inner_mac_header(skb, nhoff + gh_len);
 501
 502         return err;
 503 }
 504
 505 /* Create new listen socket if needed */
 506 static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
 507                                                 bool ipv6, bool ipv6_rx_csum)
 508 {
 509         struct geneve_net *gn = net_generic(net, geneve_net_id);
 510         struct geneve_sock *gs;
 511         struct socket *sock;
 512         struct udp_tunnel_sock_cfg tunnel_cfg;
 513         int h;
 514
 515         gs = kzalloc(sizeof(*gs), GFP_KERNEL);
 516         if (!gs)
 517                 return ERR_PTR(-ENOMEM);
 518
 519         sock = geneve_create_sock(net, ipv6, port, ipv6_rx_csum);
 520         if (IS_ERR(sock)) {
 521                 kfree(gs);
 522                 return ERR_CAST(sock);
 523         }
 524
 525         gs->sock = sock;
 526         gs->refcnt = 1;
 527         for (h = 0; h < VNI_HASH_SIZE; ++h)
 528                 INIT_HLIST_HEAD(&gs->vni_list[h]);
 529
 530         /* Initialize the geneve udp offloads structure */
 531         udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
 532
 533         /* Mark socket as an encapsulation socket */
 534         memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
 535         tunnel_cfg.sk_user_data = gs;
 536         tunnel_cfg.encap_type = 1;
 537         tunnel_cfg.gro_receive = geneve_gro_receive;
 538         tunnel_cfg.gro_complete = geneve_gro_complete;
 539         tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
 540         tunnel_cfg.encap_destroy = NULL;
 541         setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
 542         list_add(&gs->list, &gn->sock_list);
 543         return gs;
 544 }
 545
 546 static void __geneve_sock_release(struct geneve_sock *gs)
 547 {
 548         if (!gs || --gs->refcnt)
 549                 return;
 550
 551         list_del(&gs->list);
 552         udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
 553         udp_tunnel_sock_release(gs->sock);
 554         kfree_rcu(gs, rcu);
 555 }
 556
 557 static void geneve_sock_release(struct geneve_dev *geneve)
 558 {
 559         struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4);
 560 #if IS_ENABLED(CONFIG_IPV6)
 561         struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6);
 562
 563         rcu_assign_pointer(geneve->sock6, NULL);
 564 #endif
 565
 566         rcu_assign_pointer(geneve->sock4, NULL);
 567         synchronize_net();
 568
 569         __geneve_sock_release(gs4);
 570 #if IS_ENABLED(CONFIG_IPV6)
 571         __geneve_sock_release(gs6);
 572 #endif
 573 }
 574
 575 static struct geneve_sock *geneve_find_sock(struct geneve_net *gn,
 576                                             sa_family_t family,
 577                                             __be16 dst_port)
 578 {
 579         struct geneve_sock *gs;
 580
 581         list_for_each_entry(gs, &gn->sock_list, list) {
 582                 if (inet_sk(gs->sock->sk)->inet_sport == dst_port &&
 583                     geneve_get_sk_family(gs) == family) {
 584                         return gs;
 585                 }
 586         }
 587         return NULL;
 588 }
 589
 590 static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6)
 591 {
 592         struct net *net = geneve->net;
 593         struct geneve_net *gn = net_generic(net, geneve_net_id);
 594         struct geneve_sock *gs;
 595         __u8 vni[3];
 596         __u32 hash;
 597
 598         gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->info.key.tp_dst);
 599         if (gs) {
 600                 gs->refcnt++;
 601                 goto out;
 602         }
 603
 604         gs = geneve_socket_create(net, geneve->info.key.tp_dst, ipv6,
 605                                   geneve->use_udp6_rx_checksums);
 606         if (IS_ERR(gs))
 607                 return PTR_ERR(gs);
 608
 609 out:
 610         gs->collect_md = geneve->collect_md;
 611 #if IS_ENABLED(CONFIG_IPV6)
 612         if (ipv6)
 613                 rcu_assign_pointer(geneve->sock6, gs);
 614         else
 615 #endif
 616                 rcu_assign_pointer(geneve->sock4, gs);
 617
 618         tunnel_id_to_vni(geneve->info.key.tun_id, vni);
 619         hash = geneve_net_vni_hash(vni);
 620         hlist_add_head_rcu(&geneve->hlist, &gs->vni_list[hash]);
 621         return 0;
 622 }
 623
 624 static int geneve_open(struct net_device *dev)
 625 {
 626         struct geneve_dev *geneve = netdev_priv(dev);
 627         bool ipv6 = !!(geneve->info.mode & IP_TUNNEL_INFO_IPV6);
 628         bool metadata = geneve->collect_md;
 629         int ret = 0;
 630
 631 #if IS_ENABLED(CONFIG_IPV6)
 632         if (ipv6 || metadata)
 633                 ret = geneve_sock_add(geneve, true);
 634 #endif
 635         if (!ret && (!ipv6 || metadata))
 636                 ret = geneve_sock_add(geneve, false);
 637         if (ret < 0)
 638                 geneve_sock_release(geneve);
 639
 640         return ret;
 641 }
 642
 643 static int geneve_stop(struct net_device *dev)
 644 {
 645         struct geneve_dev *geneve = netdev_priv(dev);
 646
 647         if (!hlist_unhashed(&geneve->hlist))
 648                 hlist_del_rcu(&geneve->hlist);
 649         geneve_sock_release(geneve);
 650         return 0;
 651 }
 652
 653 static void geneve_build_header(struct genevehdr *geneveh,
 654                                 const struct ip_tunnel_info *info)
 655 {
 656         geneveh->ver = GENEVE_VER;
 657         geneveh->opt_len = info->options_len / 4;
 658         geneveh->oam = !!(info->key.tun_flags & TUNNEL_OAM);
 659         geneveh->critical = !!(info->key.tun_flags & TUNNEL_CRIT_OPT);
 660         geneveh->rsvd1 = 0;
 661         tunnel_id_to_vni(info->key.tun_id, geneveh->vni);
 662         geneveh->proto_type = htons(ETH_P_TEB);
 663         geneveh->rsvd2 = 0;
 664
 665         ip_tunnel_info_opts_get(geneveh->options, info);
 666 }
 667
 668 static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb,
 669                             const struct ip_tunnel_info *info,
 670                             bool xnet, int ip_hdr_len)
 671 {
 672         bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
 673         struct genevehdr *gnvh;
 674         int min_headroom;
 675         int err;
 676
 677         skb_reset_mac_header(skb);
 678         skb_scrub_packet(skb, xnet);
 679
 680         min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len +
 681                        GENEVE_BASE_HLEN + info->options_len + ip_hdr_len;
 682         err = skb_cow_head(skb, min_headroom);
 683         if (unlikely(err))
 684                 goto free_dst;
 685
 686         err = udp_tunnel_handle_offloads(skb, udp_sum);
 687         if (err)
 688                 goto free_dst;
 689
 690         gnvh = __skb_push(skb, sizeof(*gnvh) + info->options_len);
 691         geneve_build_header(gnvh, info);
 692         skb_set_inner_protocol(skb, htons(ETH_P_TEB));
 693         return 0;
 694
 695 free_dst:
 696         dst_release(dst);
 697         return err;
 698 }
 699
 700 static struct rtable *geneve_get_v4_rt(struct sk_buff *skb,
 701                                        struct net_device *dev,
 702                                        struct flowi4 *fl4,
 703                                        const struct ip_tunnel_info *info)
 704 {
 705         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
 706         struct geneve_dev *geneve = netdev_priv(dev);
 707         struct dst_cache *dst_cache;
 708         struct rtable *rt = NULL;
 709         __u8 tos;
 710
 711         if (!rcu_dereference(geneve->sock4))
 712                 return ERR_PTR(-EIO);
 713
 714         memset(fl4, 0, sizeof(*fl4));
 715         fl4->flowi4_mark = skb->mark;
 716         fl4->flowi4_proto = IPPROTO_UDP;
 717         fl4->daddr = info->key.u.ipv4.dst;
 718         fl4->saddr = info->key.u.ipv4.src;
 719
 720         tos = info->key.tos;
 721         if ((tos == 1) && !geneve->collect_md) {
 722                 tos = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
 723                 use_cache = false;
 724         }
 725         fl4->flowi4_tos = RT_TOS(tos);
 726
 727         dst_cache = (struct dst_cache *)&info->dst_cache;
 728         if (use_cache) {
 729                 rt = dst_cache_get_ip4(dst_cache, &fl4->saddr);
 730                 if (rt)
 731                         return rt;
 732         }
 733         rt = ip_route_output_key(geneve->net, fl4);
 734         if (IS_ERR(rt)) {
 735                 netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr);
 736                 return ERR_PTR(-ENETUNREACH);
 737         }
 738         if (rt->dst.dev == dev) { /* is this necessary? */
 739                 netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr);
 740                 ip_rt_put(rt);
 741                 return ERR_PTR(-ELOOP);
 742         }
 743         if (use_cache)
 744                 dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr);
 745         return rt;
 746 }
 747
 748 #if IS_ENABLED(CONFIG_IPV6)
 749 static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb,
 750                                            struct net_device *dev,
 751                                            struct flowi6 *fl6,
 752                                            const struct ip_tunnel_info *info)
 753 {
 754         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
 755         struct geneve_dev *geneve = netdev_priv(dev);
 756         struct dst_entry *dst = NULL;
 757         struct dst_cache *dst_cache;
 758         struct geneve_sock *gs6;
 759         __u8 prio;
 760
 761         gs6 = rcu_dereference(geneve->sock6);
 762         if (!gs6)
 763                 return ERR_PTR(-EIO);
 764
 765         memset(fl6, 0, sizeof(*fl6));
 766         fl6->flowi6_mark = skb->mark;
 767         fl6->flowi6_proto = IPPROTO_UDP;
 768         fl6->daddr = info->key.u.ipv6.dst;
 769         fl6->saddr = info->key.u.ipv6.src;
 770         prio = info->key.tos;
 771         if ((prio == 1) && !geneve->collect_md) {
 772                 prio = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
 773                 use_cache = false;
 774         }
 775
 776         fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio),
 777                                            info->key.label);
 778         dst_cache = (struct dst_cache *)&info->dst_cache;
 779         if (use_cache) {
 780                 dst = dst_cache_get_ip6(dst_cache, &fl6->saddr);
 781                 if (dst)
 782                         return dst;
 783         }
 784         if (ipv6_stub->ipv6_dst_lookup(geneve->net, gs6->sock->sk, &dst, fl6)) {
 785                 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr);
 786                 return ERR_PTR(-ENETUNREACH);
 787         }
 788         if (dst->dev == dev) { /* is this necessary? */
 789                 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr);
 790                 dst_release(dst);
 791                 return ERR_PTR(-ELOOP);
 792         }
 793
 794         if (use_cache)
 795                 dst_cache_set_ip6(dst_cache, dst, &fl6->saddr);
 796         return dst;
 797 }
 798 #endif
 799
 800 static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
 801                            struct geneve_dev *geneve,
 802                            const struct ip_tunnel_info *info)
 803 {
 804         bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
 805         struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
 806         const struct ip_tunnel_key *key = &info->key;
 807         struct rtable *rt;
 808         struct flowi4 fl4;
 809         __u8 tos, ttl;
 810         __be16 sport;
 811         __be16 df;
 812         int err;
 813
 814         rt = geneve_get_v4_rt(skb, dev, &fl4, info);
 815         if (IS_ERR(rt))
 816                 return PTR_ERR(rt);
 817
 818         sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
 819         if (geneve->collect_md) {
 820                 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
 821                 ttl = key->ttl;
 822         } else {
 823                 tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, ip_hdr(skb), skb);
 824                 ttl = key->ttl ? : ip4_dst_hoplimit(&rt->dst);
 825         }
 826         df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
 827
 828         err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr));
 829         if (unlikely(err))
 830                 return err;
 831
 832         udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr,
 833                             tos, ttl, df, sport, geneve->info.key.tp_dst,
 834                             !net_eq(geneve->net, dev_net(geneve->dev)),
 835                             !(info->key.tun_flags & TUNNEL_CSUM));
 836         return 0;
 837 }
 838
 839 #if IS_ENABLED(CONFIG_IPV6)
 840 static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
 841                             struct geneve_dev *geneve,
 842                             const struct ip_tunnel_info *info)
 843 {
 844         bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
 845         struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
 846         const struct ip_tunnel_key *key = &info->key;
 847         struct dst_entry *dst = NULL;
 848         struct flowi6 fl6;
 849         __u8 prio, ttl;
 850         __be16 sport;
 851         int err;
 852
 853         dst = geneve_get_v6_dst(skb, dev, &fl6, info);
 854         if (IS_ERR(dst))
 855                 return PTR_ERR(dst);
 856
 857         sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
 858         if (geneve->collect_md) {
 859                 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
 860                 ttl = key->ttl;
 861         } else {
 862                 prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel),
 863                                            ip_hdr(skb), skb);
 864                 ttl = key->ttl ? : ip6_dst_hoplimit(dst);
 865         }
 866         err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr));
 867         if (unlikely(err))
 868                 return err;
 869
 870         udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
 871                              &fl6.saddr, &fl6.daddr, prio, ttl,
 872                              info->key.label, sport, geneve->info.key.tp_dst,
 873                              !(info->key.tun_flags & TUNNEL_CSUM));
 874         return 0;
 875 }
 876 #endif
 877
 878 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
 879 {
 880         struct geneve_dev *geneve = netdev_priv(dev);
 881         struct ip_tunnel_info *info = NULL;
 882         int err;
 883
 884         if (geneve->collect_md) {
 885                 info = skb_tunnel_info(skb);
 886                 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
 887                         err = -EINVAL;
 888                         netdev_dbg(dev, "no tunnel metadata\n");
 889                         goto tx_error;
 890                 }
 891         } else {
 892                 info = &geneve->info;
 893         }
 894
 895         rcu_read_lock();
 896 #if IS_ENABLED(CONFIG_IPV6)
 897         if (info->mode & IP_TUNNEL_INFO_IPV6)
 898                 err = geneve6_xmit_skb(skb, dev, geneve, info);
 899         else
 900 #endif
 901                 err = geneve_xmit_skb(skb, dev, geneve, info);
 902         rcu_read_unlock();
 903
 904         if (likely(!err))
 905                 return NETDEV_TX_OK;
 906 tx_error:
 907         dev_kfree_skb(skb);
 908
 909         if (err == -ELOOP)
 910                 dev->stats.collisions++;
 911         else if (err == -ENETUNREACH)
 912                 dev->stats.tx_carrier_errors++;
 913
 914         dev->stats.tx_errors++;
 915         return NETDEV_TX_OK;
 916 }
 917
 918 static int geneve_change_mtu(struct net_device *dev, int new_mtu)
 919 {
 920         /* Only possible if called internally, ndo_change_mtu path's new_mtu
 921          * is guaranteed to be between dev->min_mtu and dev->max_mtu.
 922          */
 923         if (new_mtu > dev->max_mtu)
 924                 new_mtu = dev->max_mtu;
 925
 926         dev->mtu = new_mtu;
 927         return 0;
 928 }
 929
 930 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
 931 {
 932         struct ip_tunnel_info *info = skb_tunnel_info(skb);
 933         struct geneve_dev *geneve = netdev_priv(dev);
 934
 935         if (ip_tunnel_info_af(info) == AF_INET) {
 936                 struct rtable *rt;
 937                 struct flowi4 fl4;
 938
 939                 rt = geneve_get_v4_rt(skb, dev, &fl4, info);
 940                 if (IS_ERR(rt))
 941                         return PTR_ERR(rt);
 942
 943                 ip_rt_put(rt);
 944                 info->key.u.ipv4.src = fl4.saddr;
 945 #if IS_ENABLED(CONFIG_IPV6)
 946         } else if (ip_tunnel_info_af(info) == AF_INET6) {
 947                 struct dst_entry *dst;
 948                 struct flowi6 fl6;
 949
 950                 dst = geneve_get_v6_dst(skb, dev, &fl6, info);
 951                 if (IS_ERR(dst))
 952                         return PTR_ERR(dst);
 953
 954                 dst_release(dst);
 955                 info->key.u.ipv6.src = fl6.saddr;
 956 #endif
 957         } else {
 958                 return -EINVAL;
 959         }
 960
 961         info->key.tp_src = udp_flow_src_port(geneve->net, skb,
 962                                              1, USHRT_MAX, true);
 963         info->key.tp_dst = geneve->info.key.tp_dst;
 964         return 0;
 965 }
 966
 967 static const struct net_device_ops geneve_netdev_ops = {
 968         .ndo_init               = geneve_init,
 969         .ndo_uninit             = geneve_uninit,
 970         .ndo_open               = geneve_open,
 971         .ndo_stop               = geneve_stop,
 972         .ndo_start_xmit         = geneve_xmit,
 973         .ndo_get_stats64        = ip_tunnel_get_stats64,
 974         .ndo_change_mtu         = geneve_change_mtu,
 975         .ndo_validate_addr      = eth_validate_addr,
 976         .ndo_set_mac_address    = eth_mac_addr,
 977         .ndo_fill_metadata_dst  = geneve_fill_metadata_dst,
 978 };
 979
 980 static void geneve_get_drvinfo(struct net_device *dev,
 981                                struct ethtool_drvinfo *drvinfo)
 982 {
 983         strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
 984         strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
 985 }
 986
 987 static const struct ethtool_ops geneve_ethtool_ops = {
 988         .get_drvinfo    = geneve_get_drvinfo,
 989         .get_link       = ethtool_op_get_link,
 990 };
 991
 992 /* Info for udev, that this is a virtual tunnel endpoint */
 993 static struct device_type geneve_type = {
 994         .name = "geneve",
 995 };
 996
 997 /* Calls the ndo_udp_tunnel_add of the caller in order to
 998  * supply the listening GENEVE udp ports. Callers are expected
 999  * to implement the ndo_udp_tunnel_add.
1000  */
1001 static void geneve_push_rx_ports(struct net_device *dev)
1002 {
1003         struct net *net = dev_net(dev);
1004         struct geneve_net *gn = net_generic(net, geneve_net_id);
1005         struct geneve_sock *gs;
1006
1007         rcu_read_lock();
1008         list_for_each_entry_rcu(gs, &gn->sock_list, list)
1009                 udp_tunnel_push_rx_port(dev, gs->sock,
1010                                         UDP_TUNNEL_TYPE_GENEVE);
1011         rcu_read_unlock();
1012 }
1013
1014 /* Initialize the device structure. */
1015 static void geneve_setup(struct net_device *dev)
1016 {
1017         ether_setup(dev);
1018
1019         dev->netdev_ops = &geneve_netdev_ops;
1020         dev->ethtool_ops = &geneve_ethtool_ops;
1021         dev->needs_free_netdev = true;
1022
1023         SET_NETDEV_DEVTYPE(dev, &geneve_type);
1024
1025         dev->features    |= NETIF_F_LLTX;
1026         dev->features    |= NETIF_F_SG | NETIF_F_HW_CSUM;
1027         dev->features    |= NETIF_F_RXCSUM;
1028         dev->features    |= NETIF_F_GSO_SOFTWARE;
1029
1030         dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
1031         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1032
1033         /* MTU range: 68 - (something less than 65535) */
1034         dev->min_mtu = ETH_MIN_MTU;
1035         /* The max_mtu calculation does not take account of GENEVE
1036          * options, to avoid excluding potentially valid
1037          * configurations. This will be further reduced by IPvX hdr size.
1038          */
1039         dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len;
1040
1041         netif_keep_dst(dev);
1042         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1043         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
1044         eth_hw_addr_random(dev);
1045 }
1046
1047 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
1048         [IFLA_GENEVE_ID]                = { .type = NLA_U32 },
1049         [IFLA_GENEVE_REMOTE]            = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
1050         [IFLA_GENEVE_REMOTE6]           = { .len = sizeof(struct in6_addr) },
1051         [IFLA_GENEVE_TTL]               = { .type = NLA_U8 },
1052         [IFLA_GENEVE_TOS]               = { .type = NLA_U8 },
1053         [IFLA_GENEVE_LABEL]             = { .type = NLA_U32 },
1054         [IFLA_GENEVE_PORT]              = { .type = NLA_U16 },
1055         [IFLA_GENEVE_COLLECT_METADATA]  = { .type = NLA_FLAG },
1056         [IFLA_GENEVE_UDP_CSUM]          = { .type = NLA_U8 },
1057         [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
1058         [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
1059 };
1060
1061 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[])
1062 {
1063         if (tb[IFLA_ADDRESS]) {
1064                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1065                         return -EINVAL;
1066
1067                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1068                         return -EADDRNOTAVAIL;
1069         }
1070
1071         if (!data)
1072                 return -EINVAL;
1073
1074         if (data[IFLA_GENEVE_ID]) {
1075                 __u32 vni =  nla_get_u32(data[IFLA_GENEVE_ID]);
1076
1077                 if (vni >= GENEVE_VID_MASK)
1078                         return -ERANGE;
1079         }
1080
1081         return 0;
1082 }
1083
1084 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
1085                                           const struct ip_tunnel_info *info,
1086                                           bool *tun_on_same_port,
1087                                           bool *tun_collect_md)
1088 {
1089         struct geneve_dev *geneve, *t = NULL;
1090
1091         *tun_on_same_port = false;
1092         *tun_collect_md = false;
1093         list_for_each_entry(geneve, &gn->geneve_list, next) {
1094                 if (info->key.tp_dst == geneve->info.key.tp_dst) {
1095                         *tun_collect_md = geneve->collect_md;
1096                         *tun_on_same_port = true;
1097                 }
1098                 if (info->key.tun_id == geneve->info.key.tun_id &&
1099                     info->key.tp_dst == geneve->info.key.tp_dst &&
1100                     !memcmp(&info->key.u, &geneve->info.key.u, sizeof(info->key.u)))
1101                         t = geneve;
1102         }
1103         return t;
1104 }
1105
1106 static bool is_all_zero(const u8 *fp, size_t size)
1107 {
1108         int i;
1109
1110         for (i = 0; i < size; i++)
1111                 if (fp[i])
1112                         return false;
1113         return true;
1114 }
1115
1116 static bool is_tnl_info_zero(const struct ip_tunnel_info *info)
1117 {
1118         if (info->key.tun_id || info->key.tun_flags || info->key.tos ||
1119             info->key.ttl || info->key.label || info->key.tp_src ||
1120             !is_all_zero((const u8 *)&info->key.u, sizeof(info->key.u)))
1121                 return false;
1122         else
1123                 return true;
1124 }
1125
1126 static int geneve_configure(struct net *net, struct net_device *dev,
1127                             const struct ip_tunnel_info *info,
1128                             bool metadata, bool ipv6_rx_csum)
1129 {
1130         struct geneve_net *gn = net_generic(net, geneve_net_id);
1131         struct geneve_dev *t, *geneve = netdev_priv(dev);
1132         bool tun_collect_md, tun_on_same_port;
1133         int err, encap_len;
1134
1135         if (metadata && !is_tnl_info_zero(info))
1136                 return -EINVAL;
1137
1138         geneve->net = net;
1139         geneve->dev = dev;
1140
1141         t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md);
1142         if (t)
1143                 return -EBUSY;
1144
1145         /* make enough headroom for basic scenario */
1146         encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
1147         if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
1148                 encap_len += sizeof(struct iphdr);
1149                 dev->max_mtu -= sizeof(struct iphdr);
1150         } else {
1151                 encap_len += sizeof(struct ipv6hdr);
1152                 dev->max_mtu -= sizeof(struct ipv6hdr);
1153         }
1154         dev->needed_headroom = encap_len + ETH_HLEN;
1155
1156         if (metadata) {
1157                 if (tun_on_same_port)
1158                         return -EPERM;
1159         } else {
1160                 if (tun_collect_md)
1161                         return -EPERM;
1162         }
1163
1164         dst_cache_reset(&geneve->info.dst_cache);
1165         geneve->info = *info;
1166         geneve->collect_md = metadata;
1167         geneve->use_udp6_rx_checksums = ipv6_rx_csum;
1168
1169         err = register_netdevice(dev);
1170         if (err)
1171                 return err;
1172
1173         list_add(&geneve->next, &gn->geneve_list);
1174         return 0;
1175 }
1176
1177 static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port)
1178 {
1179         memset(info, 0, sizeof(*info));
1180         info->key.tp_dst = htons(dst_port);
1181 }
1182
1183 static int geneve_newlink(struct net *net, struct net_device *dev,
1184                           struct nlattr *tb[], struct nlattr *data[],
1185                           struct netlink_ext_ack *extack)
1186 {
1187         bool use_udp6_rx_checksums = false;
1188         struct ip_tunnel_info info;
1189         bool metadata = false;
1190
1191         init_tnl_info(&info, GENEVE_UDP_PORT);
1192
1193         if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6])
1194                 return -EINVAL;
1195
1196         if (data[IFLA_GENEVE_REMOTE]) {
1197                 info.key.u.ipv4.dst =
1198                         nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
1199
1200                 if (IN_MULTICAST(ntohl(info.key.u.ipv4.dst))) {
1201                         netdev_dbg(dev, "multicast remote is unsupported\n");
1202                         return -EINVAL;
1203                 }
1204         }
1205
1206         if (data[IFLA_GENEVE_REMOTE6]) {
1207  #if IS_ENABLED(CONFIG_IPV6)
1208                 info.mode = IP_TUNNEL_INFO_IPV6;
1209                 info.key.u.ipv6.dst =
1210                         nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
1211
1212                 if (ipv6_addr_type(&info.key.u.ipv6.dst) &
1213                     IPV6_ADDR_LINKLOCAL) {
1214                         netdev_dbg(dev, "link-local remote is unsupported\n");
1215                         return -EINVAL;
1216                 }
1217                 if (ipv6_addr_is_multicast(&info.key.u.ipv6.dst)) {
1218                         netdev_dbg(dev, "multicast remote is unsupported\n");
1219                         return -EINVAL;
1220                 }
1221                 info.key.tun_flags |= TUNNEL_CSUM;
1222                 use_udp6_rx_checksums = true;
1223 #else
1224                 return -EPFNOSUPPORT;
1225 #endif
1226         }
1227
1228         if (data[IFLA_GENEVE_ID]) {
1229                 __u32 vni;
1230                 __u8 tvni[3];
1231
1232                 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1233                 tvni[0] = (vni & 0x00ff0000) >> 16;
1234                 tvni[1] = (vni & 0x0000ff00) >> 8;
1235                 tvni[2] =  vni & 0x000000ff;
1236
1237                 info.key.tun_id = vni_to_tunnel_id(tvni);
1238         }
1239         if (data[IFLA_GENEVE_TTL])
1240                 info.key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
1241
1242         if (data[IFLA_GENEVE_TOS])
1243                 info.key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
1244
1245         if (data[IFLA_GENEVE_LABEL]) {
1246                 info.key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) &
1247                                   IPV6_FLOWLABEL_MASK;
1248                 if (info.key.label && (!(info.mode & IP_TUNNEL_INFO_IPV6)))
1249                         return -EINVAL;
1250         }
1251
1252         if (data[IFLA_GENEVE_PORT])
1253                 info.key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]);
1254
1255         if (data[IFLA_GENEVE_COLLECT_METADATA])
1256                 metadata = true;
1257
1258         if (data[IFLA_GENEVE_UDP_CSUM] &&
1259             nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
1260                 info.key.tun_flags |= TUNNEL_CSUM;
1261
1262         if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX] &&
1263             nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
1264                 info.key.tun_flags &= ~TUNNEL_CSUM;
1265
1266         if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX] &&
1267             nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
1268                 use_udp6_rx_checksums = false;
1269
1270         return geneve_configure(net, dev, &info, metadata, use_udp6_rx_checksums);
1271 }
1272
1273 static void geneve_dellink(struct net_device *dev, struct list_head *head)
1274 {
1275         struct geneve_dev *geneve = netdev_priv(dev);
1276
1277         list_del(&geneve->next);
1278         unregister_netdevice_queue(dev, head);
1279 }
1280
1281 static size_t geneve_get_size(const struct net_device *dev)
1282 {
1283         return nla_total_size(sizeof(__u32)) +  /* IFLA_GENEVE_ID */
1284                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */
1285                 nla_total_size(sizeof(__u8)) +  /* IFLA_GENEVE_TTL */
1286                 nla_total_size(sizeof(__u8)) +  /* IFLA_GENEVE_TOS */
1287                 nla_total_size(sizeof(__be32)) +  /* IFLA_GENEVE_LABEL */
1288                 nla_total_size(sizeof(__be16)) +  /* IFLA_GENEVE_PORT */
1289                 nla_total_size(0) +      /* IFLA_GENEVE_COLLECT_METADATA */
1290                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */
1291                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */
1292                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */
1293                 0;
1294 }
1295
1296 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
1297 {
1298         struct geneve_dev *geneve = netdev_priv(dev);
1299         struct ip_tunnel_info *info = &geneve->info;
1300         __u8 tmp_vni[3];
1301         __u32 vni;
1302
1303         tunnel_id_to_vni(info->key.tun_id, tmp_vni);
1304         vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2];
1305         if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
1306                 goto nla_put_failure;
1307
1308         if (rtnl_dereference(geneve->sock4)) {
1309                 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
1310                                     info->key.u.ipv4.dst))
1311                         goto nla_put_failure;
1312
1313                 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM,
1314                                !!(info->key.tun_flags & TUNNEL_CSUM)))
1315                         goto nla_put_failure;
1316
1317         }
1318
1319 #if IS_ENABLED(CONFIG_IPV6)
1320         if (rtnl_dereference(geneve->sock6)) {
1321                 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6,
1322                                      &info->key.u.ipv6.dst))
1323                         goto nla_put_failure;
1324
1325                 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
1326                                !(info->key.tun_flags & TUNNEL_CSUM)))
1327                         goto nla_put_failure;
1328
1329                 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
1330                                !geneve->use_udp6_rx_checksums))
1331                         goto nla_put_failure;
1332         }
1333 #endif
1334
1335         if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) ||
1336             nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) ||
1337             nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label))
1338                 goto nla_put_failure;
1339
1340         if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst))
1341                 goto nla_put_failure;
1342
1343         if (geneve->collect_md) {
1344                 if (nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
1345                         goto nla_put_failure;
1346         }
1347         return 0;
1348
1349 nla_put_failure:
1350         return -EMSGSIZE;
1351 }
1352
1353 static struct rtnl_link_ops geneve_link_ops __read_mostly = {
1354         .kind           = "geneve",
1355         .maxtype        = IFLA_GENEVE_MAX,
1356         .policy         = geneve_policy,
1357         .priv_size      = sizeof(struct geneve_dev),
1358         .setup          = geneve_setup,
1359         .validate       = geneve_validate,
1360         .newlink        = geneve_newlink,
1361         .dellink        = geneve_dellink,
1362         .get_size       = geneve_get_size,
1363         .fill_info      = geneve_fill_info,
1364 };
1365
1366 struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
1367                                         u8 name_assign_type, u16 dst_port)
1368 {
1369         struct nlattr *tb[IFLA_MAX + 1];
1370         struct ip_tunnel_info info;
1371         struct net_device *dev;
1372         LIST_HEAD(list_kill);
1373         int err;
1374
1375         memset(tb, 0, sizeof(tb));
1376         dev = rtnl_create_link(net, name, name_assign_type,
1377                                &geneve_link_ops, tb);
1378         if (IS_ERR(dev))
1379                 return dev;
1380
1381         init_tnl_info(&info, dst_port);
1382         err = geneve_configure(net, dev, &info, true, true);
1383         if (err) {
1384                 free_netdev(dev);
1385                 return ERR_PTR(err);
1386         }
1387
1388         /* openvswitch users expect packet sizes to be unrestricted,
1389          * so set the largest MTU we can.
1390          */
1391         err = geneve_change_mtu(dev, IP_MAX_MTU);
1392         if (err)
1393                 goto err;
1394
1395         err = rtnl_configure_link(dev, NULL);
1396         if (err < 0)
1397                 goto err;
1398
1399         return dev;
1400 err:
1401         geneve_dellink(dev, &list_kill);
1402         unregister_netdevice_many(&list_kill);
1403         return ERR_PTR(err);
1404 }
1405 EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
1406
1407 static int geneve_netdevice_event(struct notifier_block *unused,
1408                                   unsigned long event, void *ptr)
1409 {
1410         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1411
1412         if (event == NETDEV_UDP_TUNNEL_PUSH_INFO)
1413                 geneve_push_rx_ports(dev);
1414
1415         return NOTIFY_DONE;
1416 }
1417
1418 static struct notifier_block geneve_notifier_block __read_mostly = {
1419         .notifier_call = geneve_netdevice_event,
1420 };
1421
1422 static __net_init int geneve_init_net(struct net *net)
1423 {
1424         struct geneve_net *gn = net_generic(net, geneve_net_id);
1425
1426         INIT_LIST_HEAD(&gn->geneve_list);
1427         INIT_LIST_HEAD(&gn->sock_list);
1428         return 0;
1429 }
1430
1431 static void __net_exit geneve_exit_net(struct net *net)
1432 {
1433         struct geneve_net *gn = net_generic(net, geneve_net_id);
1434         struct geneve_dev *geneve, *next;
1435         struct net_device *dev, *aux;
1436         LIST_HEAD(list);
1437
1438         rtnl_lock();
1439
1440         /* gather any geneve devices that were moved into this ns */
1441         for_each_netdev_safe(net, dev, aux)
1442                 if (dev->rtnl_link_ops == &geneve_link_ops)
1443                         unregister_netdevice_queue(dev, &list);
1444
1445         /* now gather any other geneve devices that were created in this ns */
1446         list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
1447                 /* If geneve->dev is in the same netns, it was already added
1448                  * to the list by the previous loop.
1449                  */
1450                 if (!net_eq(dev_net(geneve->dev), net))
1451                         unregister_netdevice_queue(geneve->dev, &list);
1452         }
1453
1454         /* unregister the devices gathered above */
1455         unregister_netdevice_many(&list);
1456         rtnl_unlock();
1457 }
1458
1459 static struct pernet_operations geneve_net_ops = {
1460         .init = geneve_init_net,
1461         .exit = geneve_exit_net,
1462         .id   = &geneve_net_id,
1463         .size = sizeof(struct geneve_net),
1464 };
1465
1466 static int __init geneve_init_module(void)
1467 {
1468         int rc;
1469
1470         rc = register_pernet_subsys(&geneve_net_ops);
1471         if (rc)
1472                 goto out1;
1473
1474         rc = register_netdevice_notifier(&geneve_notifier_block);
1475         if (rc)
1476                 goto out2;
1477
1478         rc = rtnl_link_register(&geneve_link_ops);
1479         if (rc)
1480                 goto out3;
1481
1482         return 0;
1483 out3:
1484         unregister_netdevice_notifier(&geneve_notifier_block);
1485 out2:
1486         unregister_pernet_subsys(&geneve_net_ops);
1487 out1:
1488         return rc;
1489 }
1490 late_initcall(geneve_init_module);
1491
1492 static void __exit geneve_cleanup_module(void)
1493 {
1494         rtnl_link_unregister(&geneve_link_ops);
1495         unregister_netdevice_notifier(&geneve_notifier_block);
1496         unregister_pernet_subsys(&geneve_net_ops);
1497 }
1498 module_exit(geneve_cleanup_module);
1499
1500 MODULE_LICENSE("GPL");
1501 MODULE_VERSION(GENEVE_NETDEV_VER);
1502 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
1503 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
1504 MODULE_ALIAS_RTNL_LINK("geneve");