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 #define GENEVE_IPV4_HLEN (ETH_HLEN + sizeof(struct iphdr) + GENEVE_BASE_HLEN)
  40 #define GENEVE_IPV6_HLEN (ETH_HLEN + sizeof(struct ipv6hdr) + GENEVE_BASE_HLEN)
  41
  42 /* per-network namespace private data for this module */
  43 struct geneve_net {
  44         struct list_head        geneve_list;
  45         struct list_head        sock_list;
  46 };
  47
  48 static unsigned int geneve_net_id;
  49
  50 struct geneve_dev_node {
  51         struct hlist_node hlist;
  52         struct geneve_dev *geneve;
  53 };
  54
  55 /* Pseudo network device */
  56 struct geneve_dev {
  57         struct geneve_dev_node hlist4;  /* vni hash table for IPv4 socket */
  58 #if IS_ENABLED(CONFIG_IPV6)
  59         struct geneve_dev_node hlist6;  /* vni hash table for IPv6 socket */
  60 #endif
  61         struct net         *net;        /* netns for packet i/o */
  62         struct net_device  *dev;        /* netdev for geneve tunnel */
  63         struct ip_tunnel_info info;
  64         struct geneve_sock __rcu *sock4;        /* IPv4 socket used for geneve tunnel */
  65 #if IS_ENABLED(CONFIG_IPV6)
  66         struct geneve_sock __rcu *sock6;        /* IPv6 socket used for geneve tunnel */
  67 #endif
  68         struct list_head   next;        /* geneve's per namespace list */
  69         struct gro_cells   gro_cells;
  70         bool               collect_md;
  71         bool               use_udp6_rx_checksums;
  72         bool               ttl_inherit;
  73 };
  74
  75 struct geneve_sock {
  76         bool                    collect_md;
  77         struct list_head        list;
  78         struct socket           *sock;
  79         struct rcu_head         rcu;
  80         int                     refcnt;
  81         struct hlist_head       vni_list[VNI_HASH_SIZE];
  82 };
  83
  84 static inline __u32 geneve_net_vni_hash(u8 vni[3])
  85 {
  86         __u32 vnid;
  87
  88         vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2];
  89         return hash_32(vnid, VNI_HASH_BITS);
  90 }
  91
  92 static __be64 vni_to_tunnel_id(const __u8 *vni)
  93 {
  94 #ifdef __BIG_ENDIAN
  95         return (vni[0] << 16) | (vni[1] << 8) | vni[2];
  96 #else
  97         return (__force __be64)(((__force u64)vni[0] << 40) |
  98                                 ((__force u64)vni[1] << 48) |
  99                                 ((__force u64)vni[2] << 56));
 100 #endif
 101 }
 102
 103 /* Convert 64 bit tunnel ID to 24 bit VNI. */
 104 static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni)
 105 {
 106 #ifdef __BIG_ENDIAN
 107         vni[0] = (__force __u8)(tun_id >> 16);
 108         vni[1] = (__force __u8)(tun_id >> 8);
 109         vni[2] = (__force __u8)tun_id;
 110 #else
 111         vni[0] = (__force __u8)((__force u64)tun_id >> 40);
 112         vni[1] = (__force __u8)((__force u64)tun_id >> 48);
 113         vni[2] = (__force __u8)((__force u64)tun_id >> 56);
 114 #endif
 115 }
 116
 117 static bool eq_tun_id_and_vni(u8 *tun_id, u8 *vni)
 118 {
 119         return !memcmp(vni, &tun_id[5], 3);
 120 }
 121
 122 static sa_family_t geneve_get_sk_family(struct geneve_sock *gs)
 123 {
 124         return gs->sock->sk->sk_family;
 125 }
 126
 127 static struct geneve_dev *geneve_lookup(struct geneve_sock *gs,
 128                                         __be32 addr, u8 vni[])
 129 {
 130         struct hlist_head *vni_list_head;
 131         struct geneve_dev_node *node;
 132         __u32 hash;
 133
 134         /* Find the device for this VNI */
 135         hash = geneve_net_vni_hash(vni);
 136         vni_list_head = &gs->vni_list[hash];
 137         hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
 138                 if (eq_tun_id_and_vni((u8 *)&node->geneve->info.key.tun_id, vni) &&
 139                     addr == node->geneve->info.key.u.ipv4.dst)
 140                         return node->geneve;
 141         }
 142         return NULL;
 143 }
 144
 145 #if IS_ENABLED(CONFIG_IPV6)
 146 static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs,
 147                                          struct in6_addr addr6, u8 vni[])
 148 {
 149         struct hlist_head *vni_list_head;
 150         struct geneve_dev_node *node;
 151         __u32 hash;
 152
 153         /* Find the device for this VNI */
 154         hash = geneve_net_vni_hash(vni);
 155         vni_list_head = &gs->vni_list[hash];
 156         hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
 157                 if (eq_tun_id_and_vni((u8 *)&node->geneve->info.key.tun_id, vni) &&
 158                     ipv6_addr_equal(&addr6, &node->geneve->info.key.u.ipv6.dst))
 159                         return node->geneve;
 160         }
 161         return NULL;
 162 }
 163 #endif
 164
 165 static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
 166 {
 167         return (struct genevehdr *)(udp_hdr(skb) + 1);
 168 }
 169
 170 static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs,
 171                                             struct sk_buff *skb)
 172 {
 173         static u8 zero_vni[3];
 174         u8 *vni;
 175
 176         if (geneve_get_sk_family(gs) == AF_INET) {
 177                 struct iphdr *iph;
 178                 __be32 addr;
 179
 180                 iph = ip_hdr(skb); /* outer IP header... */
 181
 182                 if (gs->collect_md) {
 183                         vni = zero_vni;
 184                         addr = 0;
 185                 } else {
 186                         vni = geneve_hdr(skb)->vni;
 187                         addr = iph->saddr;
 188                 }
 189
 190                 return geneve_lookup(gs, addr, vni);
 191 #if IS_ENABLED(CONFIG_IPV6)
 192         } else if (geneve_get_sk_family(gs) == AF_INET6) {
 193                 static struct in6_addr zero_addr6;
 194                 struct ipv6hdr *ip6h;
 195                 struct in6_addr addr6;
 196
 197                 ip6h = ipv6_hdr(skb); /* outer IPv6 header... */
 198
 199                 if (gs->collect_md) {
 200                         vni = zero_vni;
 201                         addr6 = zero_addr6;
 202                 } else {
 203                         vni = geneve_hdr(skb)->vni;
 204                         addr6 = ip6h->saddr;
 205                 }
 206
 207                 return geneve6_lookup(gs, addr6, vni);
 208 #endif
 209         }
 210         return NULL;
 211 }
 212
 213 /* geneve receive/decap routine */
 214 static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs,
 215                       struct sk_buff *skb)
 216 {
 217         struct genevehdr *gnvh = geneve_hdr(skb);
 218         struct metadata_dst *tun_dst = NULL;
 219         struct pcpu_sw_netstats *stats;
 220         unsigned int len;
 221         int err = 0;
 222         void *oiph;
 223
 224         if (ip_tunnel_collect_metadata() || gs->collect_md) {
 225                 __be16 flags;
 226
 227                 flags = TUNNEL_KEY | TUNNEL_GENEVE_OPT |
 228                         (gnvh->oam ? TUNNEL_OAM : 0) |
 229                         (gnvh->critical ? TUNNEL_CRIT_OPT : 0);
 230
 231                 tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags,
 232                                          vni_to_tunnel_id(gnvh->vni),
 233                                          gnvh->opt_len * 4);
 234                 if (!tun_dst) {
 235                         geneve->dev->stats.rx_dropped++;
 236                         goto drop;
 237                 }
 238                 /* Update tunnel dst according to Geneve options. */
 239                 ip_tunnel_info_opts_set(&tun_dst->u.tun_info,
 240                                         gnvh->options, gnvh->opt_len * 4,
 241                                         TUNNEL_GENEVE_OPT);
 242         } else {
 243                 /* Drop packets w/ critical options,
 244                  * since we don't support any...
 245                  */
 246                 if (gnvh->critical) {
 247                         geneve->dev->stats.rx_frame_errors++;
 248                         geneve->dev->stats.rx_errors++;
 249                         goto drop;
 250                 }
 251         }
 252
 253         skb_reset_mac_header(skb);
 254         skb->protocol = eth_type_trans(skb, geneve->dev);
 255         skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
 256
 257         if (tun_dst)
 258                 skb_dst_set(skb, &tun_dst->dst);
 259
 260         /* Ignore packet loops (and multicast echo) */
 261         if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr)) {
 262                 geneve->dev->stats.rx_errors++;
 263                 goto drop;
 264         }
 265
 266         oiph = skb_network_header(skb);
 267         skb_reset_network_header(skb);
 268
 269         if (geneve_get_sk_family(gs) == AF_INET)
 270                 err = IP_ECN_decapsulate(oiph, skb);
 271 #if IS_ENABLED(CONFIG_IPV6)
 272         else
 273                 err = IP6_ECN_decapsulate(oiph, skb);
 274 #endif
 275
 276         if (unlikely(err)) {
 277                 if (log_ecn_error) {
 278                         if (geneve_get_sk_family(gs) == AF_INET)
 279                                 net_info_ratelimited("non-ECT from %pI4 "
 280                                                      "with TOS=%#x\n",
 281                                                      &((struct iphdr *)oiph)->saddr,
 282                                                      ((struct iphdr *)oiph)->tos);
 283 #if IS_ENABLED(CONFIG_IPV6)
 284                         else
 285                                 net_info_ratelimited("non-ECT from %pI6\n",
 286                                                      &((struct ipv6hdr *)oiph)->saddr);
 287 #endif
 288                 }
 289                 if (err > 1) {
 290                         ++geneve->dev->stats.rx_frame_errors;
 291                         ++geneve->dev->stats.rx_errors;
 292                         goto drop;
 293                 }
 294         }
 295
 296         len = skb->len;
 297         err = gro_cells_receive(&geneve->gro_cells, skb);
 298         if (likely(err == NET_RX_SUCCESS)) {
 299                 stats = this_cpu_ptr(geneve->dev->tstats);
 300                 u64_stats_update_begin(&stats->syncp);
 301                 stats->rx_packets++;
 302                 stats->rx_bytes += len;
 303                 u64_stats_update_end(&stats->syncp);
 304         }
 305         return;
 306 drop:
 307         /* Consume bad packet */
 308         kfree_skb(skb);
 309 }
 310
 311 /* Setup stats when device is created */
 312 static int geneve_init(struct net_device *dev)
 313 {
 314         struct geneve_dev *geneve = netdev_priv(dev);
 315         int err;
 316
 317         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
 318         if (!dev->tstats)
 319                 return -ENOMEM;
 320
 321         err = gro_cells_init(&geneve->gro_cells, dev);
 322         if (err) {
 323                 free_percpu(dev->tstats);
 324                 return err;
 325         }
 326
 327         err = dst_cache_init(&geneve->info.dst_cache, GFP_KERNEL);
 328         if (err) {
 329                 free_percpu(dev->tstats);
 330                 gro_cells_destroy(&geneve->gro_cells);
 331                 return err;
 332         }
 333         return 0;
 334 }
 335
 336 static void geneve_uninit(struct net_device *dev)
 337 {
 338         struct geneve_dev *geneve = netdev_priv(dev);
 339
 340         dst_cache_destroy(&geneve->info.dst_cache);
 341         gro_cells_destroy(&geneve->gro_cells);
 342         free_percpu(dev->tstats);
 343 }
 344
 345 /* Callback from net/ipv4/udp.c to receive packets */
 346 static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
 347 {
 348         struct genevehdr *geneveh;
 349         struct geneve_dev *geneve;
 350         struct geneve_sock *gs;
 351         int opts_len;
 352
 353         /* Need UDP and Geneve header to be present */
 354         if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
 355                 goto drop;
 356
 357         /* Return packets with reserved bits set */
 358         geneveh = geneve_hdr(skb);
 359         if (unlikely(geneveh->ver != GENEVE_VER))
 360                 goto drop;
 361
 362         if (unlikely(geneveh->proto_type != htons(ETH_P_TEB)))
 363                 goto drop;
 364
 365         gs = rcu_dereference_sk_user_data(sk);
 366         if (!gs)
 367                 goto drop;
 368
 369         geneve = geneve_lookup_skb(gs, skb);
 370         if (!geneve)
 371                 goto drop;
 372
 373         opts_len = geneveh->opt_len * 4;
 374         if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len,
 375                                  htons(ETH_P_TEB),
 376                                  !net_eq(geneve->net, dev_net(geneve->dev)))) {
 377                 geneve->dev->stats.rx_dropped++;
 378                 goto drop;
 379         }
 380
 381         geneve_rx(geneve, gs, skb);
 382         return 0;
 383
 384 drop:
 385         /* Consume bad packet */
 386         kfree_skb(skb);
 387         return 0;
 388 }
 389
 390 static struct socket *geneve_create_sock(struct net *net, bool ipv6,
 391                                          __be16 port, bool ipv6_rx_csum)
 392 {
 393         struct socket *sock;
 394         struct udp_port_cfg udp_conf;
 395         int err;
 396
 397         memset(&udp_conf, 0, sizeof(udp_conf));
 398
 399         if (ipv6) {
 400                 udp_conf.family = AF_INET6;
 401                 udp_conf.ipv6_v6only = 1;
 402                 udp_conf.use_udp6_rx_checksums = ipv6_rx_csum;
 403         } else {
 404                 udp_conf.family = AF_INET;
 405                 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
 406         }
 407
 408         udp_conf.local_udp_port = port;
 409
 410         /* Open UDP socket */
 411         err = udp_sock_create(net, &udp_conf, &sock);
 412         if (err < 0)
 413                 return ERR_PTR(err);
 414
 415         return sock;
 416 }
 417
 418 static int geneve_hlen(struct genevehdr *gh)
 419 {
 420         return sizeof(*gh) + gh->opt_len * 4;
 421 }
 422
 423 static struct sk_buff *geneve_gro_receive(struct sock *sk,
 424                                           struct list_head *head,
 425                                           struct sk_buff *skb)
 426 {
 427         struct sk_buff *pp = NULL;
 428         struct sk_buff *p;
 429         struct genevehdr *gh, *gh2;
 430         unsigned int hlen, gh_len, off_gnv;
 431         const struct packet_offload *ptype;
 432         __be16 type;
 433         int flush = 1;
 434
 435         off_gnv = skb_gro_offset(skb);
 436         hlen = off_gnv + sizeof(*gh);
 437         gh = skb_gro_header_fast(skb, off_gnv);
 438         if (skb_gro_header_hard(skb, hlen)) {
 439                 gh = skb_gro_header_slow(skb, hlen, off_gnv);
 440                 if (unlikely(!gh))
 441                         goto out;
 442         }
 443
 444         if (gh->ver != GENEVE_VER || gh->oam)
 445                 goto out;
 446         gh_len = geneve_hlen(gh);
 447
 448         hlen = off_gnv + gh_len;
 449         if (skb_gro_header_hard(skb, hlen)) {
 450                 gh = skb_gro_header_slow(skb, hlen, off_gnv);
 451                 if (unlikely(!gh))
 452                         goto out;
 453         }
 454
 455         list_for_each_entry(p, head, list) {
 456                 if (!NAPI_GRO_CB(p)->same_flow)
 457                         continue;
 458
 459                 gh2 = (struct genevehdr *)(p->data + off_gnv);
 460                 if (gh->opt_len != gh2->opt_len ||
 461                     memcmp(gh, gh2, gh_len)) {
 462                         NAPI_GRO_CB(p)->same_flow = 0;
 463                         continue;
 464                 }
 465         }
 466
 467         type = gh->proto_type;
 468
 469         rcu_read_lock();
 470         ptype = gro_find_receive_by_type(type);
 471         if (!ptype)
 472                 goto out_unlock;
 473
 474         skb_gro_pull(skb, gh_len);
 475         skb_gro_postpull_rcsum(skb, gh, gh_len);
 476         pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
 477         flush = 0;
 478
 479 out_unlock:
 480         rcu_read_unlock();
 481 out:
 482         skb_gro_flush_final(skb, pp, flush);
 483
 484         return pp;
 485 }
 486
 487 static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb,
 488                                int nhoff)
 489 {
 490         struct genevehdr *gh;
 491         struct packet_offload *ptype;
 492         __be16 type;
 493         int gh_len;
 494         int err = -ENOSYS;
 495
 496         gh = (struct genevehdr *)(skb->data + nhoff);
 497         gh_len = geneve_hlen(gh);
 498         type = gh->proto_type;
 499
 500         rcu_read_lock();
 501         ptype = gro_find_complete_by_type(type);
 502         if (ptype)
 503                 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
 504
 505         rcu_read_unlock();
 506
 507         skb_set_inner_mac_header(skb, nhoff + gh_len);
 508
 509         return err;
 510 }
 511
 512 /* Create new listen socket if needed */
 513 static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
 514                                                 bool ipv6, bool ipv6_rx_csum)
 515 {
 516         struct geneve_net *gn = net_generic(net, geneve_net_id);
 517         struct geneve_sock *gs;
 518         struct socket *sock;
 519         struct udp_tunnel_sock_cfg tunnel_cfg;
 520         int h;
 521
 522         gs = kzalloc(sizeof(*gs), GFP_KERNEL);
 523         if (!gs)
 524                 return ERR_PTR(-ENOMEM);
 525
 526         sock = geneve_create_sock(net, ipv6, port, ipv6_rx_csum);
 527         if (IS_ERR(sock)) {
 528                 kfree(gs);
 529                 return ERR_CAST(sock);
 530         }
 531
 532         gs->sock = sock;
 533         gs->refcnt = 1;
 534         for (h = 0; h < VNI_HASH_SIZE; ++h)
 535                 INIT_HLIST_HEAD(&gs->vni_list[h]);
 536
 537         /* Initialize the geneve udp offloads structure */
 538         udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
 539
 540         /* Mark socket as an encapsulation socket */
 541         memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
 542         tunnel_cfg.sk_user_data = gs;
 543         tunnel_cfg.encap_type = 1;
 544         tunnel_cfg.gro_receive = geneve_gro_receive;
 545         tunnel_cfg.gro_complete = geneve_gro_complete;
 546         tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
 547         tunnel_cfg.encap_destroy = NULL;
 548         setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
 549         list_add(&gs->list, &gn->sock_list);
 550         return gs;
 551 }
 552
 553 static void __geneve_sock_release(struct geneve_sock *gs)
 554 {
 555         if (!gs || --gs->refcnt)
 556                 return;
 557
 558         list_del(&gs->list);
 559         udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
 560         udp_tunnel_sock_release(gs->sock);
 561         kfree_rcu(gs, rcu);
 562 }
 563
 564 static void geneve_sock_release(struct geneve_dev *geneve)
 565 {
 566         struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4);
 567 #if IS_ENABLED(CONFIG_IPV6)
 568         struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6);
 569
 570         rcu_assign_pointer(geneve->sock6, NULL);
 571 #endif
 572
 573         rcu_assign_pointer(geneve->sock4, NULL);
 574         synchronize_net();
 575
 576         __geneve_sock_release(gs4);
 577 #if IS_ENABLED(CONFIG_IPV6)
 578         __geneve_sock_release(gs6);
 579 #endif
 580 }
 581
 582 static struct geneve_sock *geneve_find_sock(struct geneve_net *gn,
 583                                             sa_family_t family,
 584                                             __be16 dst_port)
 585 {
 586         struct geneve_sock *gs;
 587
 588         list_for_each_entry(gs, &gn->sock_list, list) {
 589                 if (inet_sk(gs->sock->sk)->inet_sport == dst_port &&
 590                     geneve_get_sk_family(gs) == family) {
 591                         return gs;
 592                 }
 593         }
 594         return NULL;
 595 }
 596
 597 static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6)
 598 {
 599         struct net *net = geneve->net;
 600         struct geneve_net *gn = net_generic(net, geneve_net_id);
 601         struct geneve_dev_node *node;
 602         struct geneve_sock *gs;
 603         __u8 vni[3];
 604         __u32 hash;
 605
 606         gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->info.key.tp_dst);
 607         if (gs) {
 608                 gs->refcnt++;
 609                 goto out;
 610         }
 611
 612         gs = geneve_socket_create(net, geneve->info.key.tp_dst, ipv6,
 613                                   geneve->use_udp6_rx_checksums);
 614         if (IS_ERR(gs))
 615                 return PTR_ERR(gs);
 616
 617 out:
 618         gs->collect_md = geneve->collect_md;
 619 #if IS_ENABLED(CONFIG_IPV6)
 620         if (ipv6) {
 621                 rcu_assign_pointer(geneve->sock6, gs);
 622                 node = &geneve->hlist6;
 623         } else
 624 #endif
 625         {
 626                 rcu_assign_pointer(geneve->sock4, gs);
 627                 node = &geneve->hlist4;
 628         }
 629         node->geneve = geneve;
 630
 631         tunnel_id_to_vni(geneve->info.key.tun_id, vni);
 632         hash = geneve_net_vni_hash(vni);
 633         hlist_add_head_rcu(&node->hlist, &gs->vni_list[hash]);
 634         return 0;
 635 }
 636
 637 static int geneve_open(struct net_device *dev)
 638 {
 639         struct geneve_dev *geneve = netdev_priv(dev);
 640         bool ipv6 = !!(geneve->info.mode & IP_TUNNEL_INFO_IPV6);
 641         bool metadata = geneve->collect_md;
 642         int ret = 0;
 643
 644 #if IS_ENABLED(CONFIG_IPV6)
 645         if (ipv6 || metadata)
 646                 ret = geneve_sock_add(geneve, true);
 647 #endif
 648         if (!ret && (!ipv6 || metadata))
 649                 ret = geneve_sock_add(geneve, false);
 650         if (ret < 0)
 651                 geneve_sock_release(geneve);
 652
 653         return ret;
 654 }
 655
 656 static int geneve_stop(struct net_device *dev)
 657 {
 658         struct geneve_dev *geneve = netdev_priv(dev);
 659
 660         hlist_del_init_rcu(&geneve->hlist4.hlist);
 661 #if IS_ENABLED(CONFIG_IPV6)
 662         hlist_del_init_rcu(&geneve->hlist6.hlist);
 663 #endif
 664         geneve_sock_release(geneve);
 665         return 0;
 666 }
 667
 668 static void geneve_build_header(struct genevehdr *geneveh,
 669                                 const struct ip_tunnel_info *info)
 670 {
 671         geneveh->ver = GENEVE_VER;
 672         geneveh->opt_len = info->options_len / 4;
 673         geneveh->oam = !!(info->key.tun_flags & TUNNEL_OAM);
 674         geneveh->critical = !!(info->key.tun_flags & TUNNEL_CRIT_OPT);
 675         geneveh->rsvd1 = 0;
 676         tunnel_id_to_vni(info->key.tun_id, geneveh->vni);
 677         geneveh->proto_type = htons(ETH_P_TEB);
 678         geneveh->rsvd2 = 0;
 679
 680         if (info->key.tun_flags & TUNNEL_GENEVE_OPT)
 681                 ip_tunnel_info_opts_get(geneveh->options, info);
 682 }
 683
 684 static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb,
 685                             const struct ip_tunnel_info *info,
 686                             bool xnet, int ip_hdr_len)
 687 {
 688         bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
 689         struct genevehdr *gnvh;
 690         int min_headroom;
 691         int err;
 692
 693         skb_reset_mac_header(skb);
 694         skb_scrub_packet(skb, xnet);
 695
 696         min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len +
 697                        GENEVE_BASE_HLEN + info->options_len + ip_hdr_len;
 698         err = skb_cow_head(skb, min_headroom);
 699         if (unlikely(err))
 700                 goto free_dst;
 701
 702         err = udp_tunnel_handle_offloads(skb, udp_sum);
 703         if (err)
 704                 goto free_dst;
 705
 706         gnvh = __skb_push(skb, sizeof(*gnvh) + info->options_len);
 707         geneve_build_header(gnvh, info);
 708         skb_set_inner_protocol(skb, htons(ETH_P_TEB));
 709         return 0;
 710
 711 free_dst:
 712         dst_release(dst);
 713         return err;
 714 }
 715
 716 static struct rtable *geneve_get_v4_rt(struct sk_buff *skb,
 717                                        struct net_device *dev,
 718                                        struct geneve_sock *gs4,
 719                                        struct flowi4 *fl4,
 720                                        const struct ip_tunnel_info *info)
 721 {
 722         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
 723         struct geneve_dev *geneve = netdev_priv(dev);
 724         struct dst_cache *dst_cache;
 725         struct rtable *rt = NULL;
 726         __u8 tos;
 727
 728         if (!gs4)
 729                 return ERR_PTR(-EIO);
 730
 731         memset(fl4, 0, sizeof(*fl4));
 732         fl4->flowi4_mark = skb->mark;
 733         fl4->flowi4_proto = IPPROTO_UDP;
 734         fl4->daddr = info->key.u.ipv4.dst;
 735         fl4->saddr = info->key.u.ipv4.src;
 736
 737         tos = info->key.tos;
 738         if ((tos == 1) && !geneve->collect_md) {
 739                 tos = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
 740                 use_cache = false;
 741         }
 742         fl4->flowi4_tos = RT_TOS(tos);
 743
 744         dst_cache = (struct dst_cache *)&info->dst_cache;
 745         if (use_cache) {
 746                 rt = dst_cache_get_ip4(dst_cache, &fl4->saddr);
 747                 if (rt)
 748                         return rt;
 749         }
 750         rt = ip_route_output_key(geneve->net, fl4);
 751         if (IS_ERR(rt)) {
 752                 netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr);
 753                 return ERR_PTR(-ENETUNREACH);
 754         }
 755         if (rt->dst.dev == dev) { /* is this necessary? */
 756                 netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr);
 757                 ip_rt_put(rt);
 758                 return ERR_PTR(-ELOOP);
 759         }
 760         if (use_cache)
 761                 dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr);
 762         return rt;
 763 }
 764
 765 #if IS_ENABLED(CONFIG_IPV6)
 766 static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb,
 767                                            struct net_device *dev,
 768                                            struct geneve_sock *gs6,
 769                                            struct flowi6 *fl6,
 770                                            const struct ip_tunnel_info *info)
 771 {
 772         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
 773         struct geneve_dev *geneve = netdev_priv(dev);
 774         struct dst_entry *dst = NULL;
 775         struct dst_cache *dst_cache;
 776         __u8 prio;
 777
 778         if (!gs6)
 779                 return ERR_PTR(-EIO);
 780
 781         memset(fl6, 0, sizeof(*fl6));
 782         fl6->flowi6_mark = skb->mark;
 783         fl6->flowi6_proto = IPPROTO_UDP;
 784         fl6->daddr = info->key.u.ipv6.dst;
 785         fl6->saddr = info->key.u.ipv6.src;
 786         prio = info->key.tos;
 787         if ((prio == 1) && !geneve->collect_md) {
 788                 prio = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
 789                 use_cache = false;
 790         }
 791
 792         fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio),
 793                                            info->key.label);
 794         dst_cache = (struct dst_cache *)&info->dst_cache;
 795         if (use_cache) {
 796                 dst = dst_cache_get_ip6(dst_cache, &fl6->saddr);
 797                 if (dst)
 798                         return dst;
 799         }
 800         if (ipv6_stub->ipv6_dst_lookup(geneve->net, gs6->sock->sk, &dst, fl6)) {
 801                 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr);
 802                 return ERR_PTR(-ENETUNREACH);
 803         }
 804         if (dst->dev == dev) { /* is this necessary? */
 805                 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr);
 806                 dst_release(dst);
 807                 return ERR_PTR(-ELOOP);
 808         }
 809
 810         if (use_cache)
 811                 dst_cache_set_ip6(dst_cache, dst, &fl6->saddr);
 812         return dst;
 813 }
 814 #endif
 815
 816 static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
 817                            struct geneve_dev *geneve,
 818                            const struct ip_tunnel_info *info)
 819 {
 820         bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
 821         struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
 822         const struct ip_tunnel_key *key = &info->key;
 823         struct rtable *rt;
 824         struct flowi4 fl4;
 825         __u8 tos, ttl;
 826         __be16 sport;
 827         __be16 df;
 828         int err;
 829
 830         rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info);
 831         if (IS_ERR(rt))
 832                 return PTR_ERR(rt);
 833
 834         if (skb_dst(skb)) {
 835                 int mtu = dst_mtu(&rt->dst) - GENEVE_IPV4_HLEN -
 836                           info->options_len;
 837
 838                 skb_dst_update_pmtu(skb, mtu);
 839         }
 840
 841         sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
 842         if (geneve->collect_md) {
 843                 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
 844                 ttl = key->ttl;
 845         } else {
 846                 tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, ip_hdr(skb), skb);
 847                 if (geneve->ttl_inherit)
 848                         ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb);
 849                 else
 850                         ttl = key->ttl;
 851                 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
 852         }
 853         df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
 854
 855         err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr));
 856         if (unlikely(err))
 857                 return err;
 858
 859         udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr,
 860                             tos, ttl, df, sport, geneve->info.key.tp_dst,
 861                             !net_eq(geneve->net, dev_net(geneve->dev)),
 862                             !(info->key.tun_flags & TUNNEL_CSUM));
 863         return 0;
 864 }
 865
 866 #if IS_ENABLED(CONFIG_IPV6)
 867 static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
 868                             struct geneve_dev *geneve,
 869                             const struct ip_tunnel_info *info)
 870 {
 871         bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
 872         struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
 873         const struct ip_tunnel_key *key = &info->key;
 874         struct dst_entry *dst = NULL;
 875         struct flowi6 fl6;
 876         __u8 prio, ttl;
 877         __be16 sport;
 878         int err;
 879
 880         dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info);
 881         if (IS_ERR(dst))
 882                 return PTR_ERR(dst);
 883
 884         if (skb_dst(skb)) {
 885                 int mtu = dst_mtu(dst) - GENEVE_IPV6_HLEN - info->options_len;
 886
 887                 skb_dst_update_pmtu(skb, mtu);
 888         }
 889
 890         sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
 891         if (geneve->collect_md) {
 892                 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
 893                 ttl = key->ttl;
 894         } else {
 895                 prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel),
 896                                            ip_hdr(skb), skb);
 897                 if (geneve->ttl_inherit)
 898                         ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb);
 899                 else
 900                         ttl = key->ttl;
 901                 ttl = ttl ? : ip6_dst_hoplimit(dst);
 902         }
 903         err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr));
 904         if (unlikely(err))
 905                 return err;
 906
 907         udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
 908                              &fl6.saddr, &fl6.daddr, prio, ttl,
 909                              info->key.label, sport, geneve->info.key.tp_dst,
 910                              !(info->key.tun_flags & TUNNEL_CSUM));
 911         return 0;
 912 }
 913 #endif
 914
 915 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
 916 {
 917         struct geneve_dev *geneve = netdev_priv(dev);
 918         struct ip_tunnel_info *info = NULL;
 919         int err;
 920
 921         if (geneve->collect_md) {
 922                 info = skb_tunnel_info(skb);
 923                 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
 924                         err = -EINVAL;
 925                         netdev_dbg(dev, "no tunnel metadata\n");
 926                         goto tx_error;
 927                 }
 928         } else {
 929                 info = &geneve->info;
 930         }
 931
 932         rcu_read_lock();
 933 #if IS_ENABLED(CONFIG_IPV6)
 934         if (info->mode & IP_TUNNEL_INFO_IPV6)
 935                 err = geneve6_xmit_skb(skb, dev, geneve, info);
 936         else
 937 #endif
 938                 err = geneve_xmit_skb(skb, dev, geneve, info);
 939         rcu_read_unlock();
 940
 941         if (likely(!err))
 942                 return NETDEV_TX_OK;
 943 tx_error:
 944         dev_kfree_skb(skb);
 945
 946         if (err == -ELOOP)
 947                 dev->stats.collisions++;
 948         else if (err == -ENETUNREACH)
 949                 dev->stats.tx_carrier_errors++;
 950
 951         dev->stats.tx_errors++;
 952         return NETDEV_TX_OK;
 953 }
 954
 955 static int geneve_change_mtu(struct net_device *dev, int new_mtu)
 956 {
 957         if (new_mtu > dev->max_mtu)
 958                 new_mtu = dev->max_mtu;
 959         else if (new_mtu < dev->min_mtu)
 960                 new_mtu = dev->min_mtu;
 961
 962         dev->mtu = new_mtu;
 963         return 0;
 964 }
 965
 966 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
 967 {
 968         struct ip_tunnel_info *info = skb_tunnel_info(skb);
 969         struct geneve_dev *geneve = netdev_priv(dev);
 970
 971         if (ip_tunnel_info_af(info) == AF_INET) {
 972                 struct rtable *rt;
 973                 struct flowi4 fl4;
 974                 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
 975
 976                 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info);
 977                 if (IS_ERR(rt))
 978                         return PTR_ERR(rt);
 979
 980                 ip_rt_put(rt);
 981                 info->key.u.ipv4.src = fl4.saddr;
 982 #if IS_ENABLED(CONFIG_IPV6)
 983         } else if (ip_tunnel_info_af(info) == AF_INET6) {
 984                 struct dst_entry *dst;
 985                 struct flowi6 fl6;
 986                 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
 987
 988                 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info);
 989                 if (IS_ERR(dst))
 990                         return PTR_ERR(dst);
 991
 992                 dst_release(dst);
 993                 info->key.u.ipv6.src = fl6.saddr;
 994 #endif
 995         } else {
 996                 return -EINVAL;
 997         }
 998
 999         info->key.tp_src = udp_flow_src_port(geneve->net, skb,
1000                                              1, USHRT_MAX, true);
1001         info->key.tp_dst = geneve->info.key.tp_dst;
1002         return 0;
1003 }
1004
1005 static const struct net_device_ops geneve_netdev_ops = {
1006         .ndo_init               = geneve_init,
1007         .ndo_uninit             = geneve_uninit,
1008         .ndo_open               = geneve_open,
1009         .ndo_stop               = geneve_stop,
1010         .ndo_start_xmit         = geneve_xmit,
1011         .ndo_get_stats64        = ip_tunnel_get_stats64,
1012         .ndo_change_mtu         = geneve_change_mtu,
1013         .ndo_validate_addr      = eth_validate_addr,
1014         .ndo_set_mac_address    = eth_mac_addr,
1015         .ndo_fill_metadata_dst  = geneve_fill_metadata_dst,
1016 };
1017
1018 static void geneve_get_drvinfo(struct net_device *dev,
1019                                struct ethtool_drvinfo *drvinfo)
1020 {
1021         strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
1022         strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
1023 }
1024
1025 static const struct ethtool_ops geneve_ethtool_ops = {
1026         .get_drvinfo    = geneve_get_drvinfo,
1027         .get_link       = ethtool_op_get_link,
1028 };
1029
1030 /* Info for udev, that this is a virtual tunnel endpoint */
1031 static struct device_type geneve_type = {
1032         .name = "geneve",
1033 };
1034
1035 /* Calls the ndo_udp_tunnel_add of the caller in order to
1036  * supply the listening GENEVE udp ports. Callers are expected
1037  * to implement the ndo_udp_tunnel_add.
1038  */
1039 static void geneve_offload_rx_ports(struct net_device *dev, bool push)
1040 {
1041         struct net *net = dev_net(dev);
1042         struct geneve_net *gn = net_generic(net, geneve_net_id);
1043         struct geneve_sock *gs;
1044
1045         rcu_read_lock();
1046         list_for_each_entry_rcu(gs, &gn->sock_list, list) {
1047                 if (push) {
1048                         udp_tunnel_push_rx_port(dev, gs->sock,
1049                                                 UDP_TUNNEL_TYPE_GENEVE);
1050                 } else {
1051                         udp_tunnel_drop_rx_port(dev, gs->sock,
1052                                                 UDP_TUNNEL_TYPE_GENEVE);
1053                 }
1054         }
1055         rcu_read_unlock();
1056 }
1057
1058 /* Initialize the device structure. */
1059 static void geneve_setup(struct net_device *dev)
1060 {
1061         ether_setup(dev);
1062
1063         dev->netdev_ops = &geneve_netdev_ops;
1064         dev->ethtool_ops = &geneve_ethtool_ops;
1065         dev->needs_free_netdev = true;
1066
1067         SET_NETDEV_DEVTYPE(dev, &geneve_type);
1068
1069         dev->features    |= NETIF_F_LLTX;
1070         dev->features    |= NETIF_F_SG | NETIF_F_HW_CSUM;
1071         dev->features    |= NETIF_F_RXCSUM;
1072         dev->features    |= NETIF_F_GSO_SOFTWARE;
1073
1074         dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
1075         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1076
1077         /* MTU range: 68 - (something less than 65535) */
1078         dev->min_mtu = ETH_MIN_MTU;
1079         /* The max_mtu calculation does not take account of GENEVE
1080          * options, to avoid excluding potentially valid
1081          * configurations. This will be further reduced by IPvX hdr size.
1082          */
1083         dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len;
1084
1085         netif_keep_dst(dev);
1086         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1087         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
1088         eth_hw_addr_random(dev);
1089 }
1090
1091 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
1092         [IFLA_GENEVE_ID]                = { .type = NLA_U32 },
1093         [IFLA_GENEVE_REMOTE]            = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
1094         [IFLA_GENEVE_REMOTE6]           = { .len = sizeof(struct in6_addr) },
1095         [IFLA_GENEVE_TTL]               = { .type = NLA_U8 },
1096         [IFLA_GENEVE_TOS]               = { .type = NLA_U8 },
1097         [IFLA_GENEVE_LABEL]             = { .type = NLA_U32 },
1098         [IFLA_GENEVE_PORT]              = { .type = NLA_U16 },
1099         [IFLA_GENEVE_COLLECT_METADATA]  = { .type = NLA_FLAG },
1100         [IFLA_GENEVE_UDP_CSUM]          = { .type = NLA_U8 },
1101         [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
1102         [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
1103         [IFLA_GENEVE_TTL_INHERIT]       = { .type = NLA_U8 },
1104 };
1105
1106 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[],
1107                            struct netlink_ext_ack *extack)
1108 {
1109         if (tb[IFLA_ADDRESS]) {
1110                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
1111                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1112                                             "Provided link layer address is not Ethernet");
1113                         return -EINVAL;
1114                 }
1115
1116                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
1117                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1118                                             "Provided Ethernet address is not unicast");
1119                         return -EADDRNOTAVAIL;
1120                 }
1121         }
1122
1123         if (!data) {
1124                 NL_SET_ERR_MSG(extack,
1125                                "Not enough attributes provided to perform the operation");
1126                 return -EINVAL;
1127         }
1128
1129         if (data[IFLA_GENEVE_ID]) {
1130                 __u32 vni =  nla_get_u32(data[IFLA_GENEVE_ID]);
1131
1132                 if (vni >= GENEVE_N_VID) {
1133                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID],
1134                                             "Geneve ID must be lower than 16777216");
1135                         return -ERANGE;
1136                 }
1137         }
1138
1139         return 0;
1140 }
1141
1142 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
1143                                           const struct ip_tunnel_info *info,
1144                                           bool *tun_on_same_port,
1145                                           bool *tun_collect_md)
1146 {
1147         struct geneve_dev *geneve, *t = NULL;
1148
1149         *tun_on_same_port = false;
1150         *tun_collect_md = false;
1151         list_for_each_entry(geneve, &gn->geneve_list, next) {
1152                 if (info->key.tp_dst == geneve->info.key.tp_dst) {
1153                         *tun_collect_md = geneve->collect_md;
1154                         *tun_on_same_port = true;
1155                 }
1156                 if (info->key.tun_id == geneve->info.key.tun_id &&
1157                     info->key.tp_dst == geneve->info.key.tp_dst &&
1158                     !memcmp(&info->key.u, &geneve->info.key.u, sizeof(info->key.u)))
1159                         t = geneve;
1160         }
1161         return t;
1162 }
1163
1164 static bool is_tnl_info_zero(const struct ip_tunnel_info *info)
1165 {
1166         return !(info->key.tun_id || info->key.tun_flags || info->key.tos ||
1167                  info->key.ttl || info->key.label || info->key.tp_src ||
1168                  memchr_inv(&info->key.u, 0, sizeof(info->key.u)));
1169 }
1170
1171 static bool geneve_dst_addr_equal(struct ip_tunnel_info *a,
1172                                   struct ip_tunnel_info *b)
1173 {
1174         if (ip_tunnel_info_af(a) == AF_INET)
1175                 return a->key.u.ipv4.dst == b->key.u.ipv4.dst;
1176         else
1177                 return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst);
1178 }
1179
1180 static int geneve_configure(struct net *net, struct net_device *dev,
1181                             struct netlink_ext_ack *extack,
1182                             const struct ip_tunnel_info *info,
1183                             bool metadata, bool ipv6_rx_csum,
1184                             bool ttl_inherit)
1185 {
1186         struct geneve_net *gn = net_generic(net, geneve_net_id);
1187         struct geneve_dev *t, *geneve = netdev_priv(dev);
1188         bool tun_collect_md, tun_on_same_port;
1189         int err, encap_len;
1190
1191         if (metadata && !is_tnl_info_zero(info)) {
1192                 NL_SET_ERR_MSG(extack,
1193                                "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified");
1194                 return -EINVAL;
1195         }
1196
1197         geneve->net = net;
1198         geneve->dev = dev;
1199
1200         t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md);
1201         if (t)
1202                 return -EBUSY;
1203
1204         /* make enough headroom for basic scenario */
1205         encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
1206         if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
1207                 encap_len += sizeof(struct iphdr);
1208                 dev->max_mtu -= sizeof(struct iphdr);
1209         } else {
1210                 encap_len += sizeof(struct ipv6hdr);
1211                 dev->max_mtu -= sizeof(struct ipv6hdr);
1212         }
1213         dev->needed_headroom = encap_len + ETH_HLEN;
1214
1215         if (metadata) {
1216                 if (tun_on_same_port) {
1217                         NL_SET_ERR_MSG(extack,
1218                                        "There can be only one externally controlled device on a destination port");
1219                         return -EPERM;
1220                 }
1221         } else {
1222                 if (tun_collect_md) {
1223                         NL_SET_ERR_MSG(extack,
1224                                        "There already exists an externally controlled device on this destination port");
1225                         return -EPERM;
1226                 }
1227         }
1228
1229         dst_cache_reset(&geneve->info.dst_cache);
1230         geneve->info = *info;
1231         geneve->collect_md = metadata;
1232         geneve->use_udp6_rx_checksums = ipv6_rx_csum;
1233         geneve->ttl_inherit = ttl_inherit;
1234
1235         err = register_netdevice(dev);
1236         if (err)
1237                 return err;
1238
1239         list_add(&geneve->next, &gn->geneve_list);
1240         return 0;
1241 }
1242
1243 static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port)
1244 {
1245         memset(info, 0, sizeof(*info));
1246         info->key.tp_dst = htons(dst_port);
1247 }
1248
1249 static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[],
1250                           struct netlink_ext_ack *extack,
1251                           struct ip_tunnel_info *info, bool *metadata,
1252                           bool *use_udp6_rx_checksums, bool *ttl_inherit,
1253                           bool changelink)
1254 {
1255         int attrtype;
1256
1257         if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) {
1258                 NL_SET_ERR_MSG(extack,
1259                                "Cannot specify both IPv4 and IPv6 Remote addresses");
1260                 return -EINVAL;
1261         }
1262
1263         if (data[IFLA_GENEVE_REMOTE]) {
1264                 if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) {
1265                         attrtype = IFLA_GENEVE_REMOTE;
1266                         goto change_notsup;
1267                 }
1268
1269                 info->key.u.ipv4.dst =
1270                         nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
1271
1272                 if (IN_MULTICAST(ntohl(info->key.u.ipv4.dst))) {
1273                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE],
1274                                             "Remote IPv4 address cannot be Multicast");
1275                         return -EINVAL;
1276                 }
1277         }
1278
1279         if (data[IFLA_GENEVE_REMOTE6]) {
1280 #if IS_ENABLED(CONFIG_IPV6)
1281                 if (changelink && (ip_tunnel_info_af(info) == AF_INET)) {
1282                         attrtype = IFLA_GENEVE_REMOTE6;
1283                         goto change_notsup;
1284                 }
1285
1286                 info->mode = IP_TUNNEL_INFO_IPV6;
1287                 info->key.u.ipv6.dst =
1288                         nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
1289
1290                 if (ipv6_addr_type(&info->key.u.ipv6.dst) &
1291                     IPV6_ADDR_LINKLOCAL) {
1292                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1293                                             "Remote IPv6 address cannot be link-local");
1294                         return -EINVAL;
1295                 }
1296                 if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) {
1297                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1298                                             "Remote IPv6 address cannot be Multicast");
1299                         return -EINVAL;
1300                 }
1301                 info->key.tun_flags |= TUNNEL_CSUM;
1302                 *use_udp6_rx_checksums = true;
1303 #else
1304                 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1305                                     "IPv6 support not enabled in the kernel");
1306                 return -EPFNOSUPPORT;
1307 #endif
1308         }
1309
1310         if (data[IFLA_GENEVE_ID]) {
1311                 __u32 vni;
1312                 __u8 tvni[3];
1313                 __be64 tunid;
1314
1315                 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1316                 tvni[0] = (vni & 0x00ff0000) >> 16;
1317                 tvni[1] = (vni & 0x0000ff00) >> 8;
1318                 tvni[2] =  vni & 0x000000ff;
1319
1320                 tunid = vni_to_tunnel_id(tvni);
1321                 if (changelink && (tunid != info->key.tun_id)) {
1322                         attrtype = IFLA_GENEVE_ID;
1323                         goto change_notsup;
1324                 }
1325                 info->key.tun_id = tunid;
1326         }
1327
1328         if (data[IFLA_GENEVE_TTL])
1329                 info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
1330
1331         if (data[IFLA_GENEVE_TTL_INHERIT])
1332                 *ttl_inherit = true;
1333
1334         if (data[IFLA_GENEVE_TOS])
1335                 info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
1336
1337         if (data[IFLA_GENEVE_LABEL]) {
1338                 info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) &
1339                                   IPV6_FLOWLABEL_MASK;
1340                 if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) {
1341                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL],
1342                                             "Label attribute only applies for IPv6 Geneve devices");
1343                         return -EINVAL;
1344                 }
1345         }
1346
1347         if (data[IFLA_GENEVE_PORT]) {
1348                 if (changelink) {
1349                         attrtype = IFLA_GENEVE_PORT;
1350                         goto change_notsup;
1351                 }
1352                 info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]);
1353         }
1354
1355         if (data[IFLA_GENEVE_COLLECT_METADATA]) {
1356                 if (changelink) {
1357                         attrtype = IFLA_GENEVE_COLLECT_METADATA;
1358                         goto change_notsup;
1359                 }
1360                 *metadata = true;
1361         }
1362
1363         if (data[IFLA_GENEVE_UDP_CSUM]) {
1364                 if (changelink) {
1365                         attrtype = IFLA_GENEVE_UDP_CSUM;
1366                         goto change_notsup;
1367                 }
1368                 if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
1369                         info->key.tun_flags |= TUNNEL_CSUM;
1370         }
1371
1372         if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) {
1373 #if IS_ENABLED(CONFIG_IPV6)
1374                 if (changelink) {
1375                         attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX;
1376                         goto change_notsup;
1377                 }
1378                 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
1379                         info->key.tun_flags &= ~TUNNEL_CSUM;
1380 #else
1381                 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX],
1382                                     "IPv6 support not enabled in the kernel");
1383                 return -EPFNOSUPPORT;
1384 #endif
1385         }
1386
1387         if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) {
1388 #if IS_ENABLED(CONFIG_IPV6)
1389                 if (changelink) {
1390                         attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX;
1391                         goto change_notsup;
1392                 }
1393                 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
1394                         *use_udp6_rx_checksums = false;
1395 #else
1396                 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX],
1397                                     "IPv6 support not enabled in the kernel");
1398                 return -EPFNOSUPPORT;
1399 #endif
1400         }
1401
1402         return 0;
1403 change_notsup:
1404         NL_SET_ERR_MSG_ATTR(extack, data[attrtype],
1405                             "Changing VNI, Port, endpoint IP address family, external, and UDP checksum attributes are not supported");
1406         return -EOPNOTSUPP;
1407 }
1408
1409 static void geneve_link_config(struct net_device *dev,
1410                                struct ip_tunnel_info *info, struct nlattr *tb[])
1411 {
1412         struct geneve_dev *geneve = netdev_priv(dev);
1413         int ldev_mtu = 0;
1414
1415         if (tb[IFLA_MTU]) {
1416                 geneve_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1417                 return;
1418         }
1419
1420         switch (ip_tunnel_info_af(info)) {
1421         case AF_INET: {
1422                 struct flowi4 fl4 = { .daddr = info->key.u.ipv4.dst };
1423                 struct rtable *rt = ip_route_output_key(geneve->net, &fl4);
1424
1425                 if (!IS_ERR(rt) && rt->dst.dev) {
1426                         ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV4_HLEN;
1427                         ip_rt_put(rt);
1428                 }
1429                 break;
1430         }
1431 #if IS_ENABLED(CONFIG_IPV6)
1432         case AF_INET6: {
1433                 struct rt6_info *rt = rt6_lookup(geneve->net,
1434                                                  &info->key.u.ipv6.dst, NULL, 0,
1435                                                  NULL, 0);
1436
1437                 if (rt && rt->dst.dev)
1438                         ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV6_HLEN;
1439                 ip6_rt_put(rt);
1440                 break;
1441         }
1442 #endif
1443         }
1444
1445         if (ldev_mtu <= 0)
1446                 return;
1447
1448         geneve_change_mtu(dev, ldev_mtu - info->options_len);
1449 }
1450
1451 static int geneve_newlink(struct net *net, struct net_device *dev,
1452                           struct nlattr *tb[], struct nlattr *data[],
1453                           struct netlink_ext_ack *extack)
1454 {
1455         bool use_udp6_rx_checksums = false;
1456         struct ip_tunnel_info info;
1457         bool ttl_inherit = false;
1458         bool metadata = false;
1459         int err;
1460
1461         init_tnl_info(&info, GENEVE_UDP_PORT);
1462         err = geneve_nl2info(tb, data, extack, &info, &metadata,
1463                              &use_udp6_rx_checksums, &ttl_inherit, false);
1464         if (err)
1465                 return err;
1466
1467         err = geneve_configure(net, dev, extack, &info, metadata,
1468                                use_udp6_rx_checksums, ttl_inherit);
1469         if (err)
1470                 return err;
1471
1472         geneve_link_config(dev, &info, tb);
1473
1474         return 0;
1475 }
1476
1477 /* Quiesces the geneve device data path for both TX and RX.
1478  *
1479  * On transmit geneve checks for non-NULL geneve_sock before it proceeds.
1480  * So, if we set that socket to NULL under RCU and wait for synchronize_net()
1481  * to complete for the existing set of in-flight packets to be transmitted,
1482  * then we would have quiesced the transmit data path. All the future packets
1483  * will get dropped until we unquiesce the data path.
1484  *
1485  * On receive geneve dereference the geneve_sock stashed in the socket. So,
1486  * if we set that to NULL under RCU and wait for synchronize_net() to
1487  * complete, then we would have quiesced the receive data path.
1488  */
1489 static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4,
1490                            struct geneve_sock **gs6)
1491 {
1492         *gs4 = rtnl_dereference(geneve->sock4);
1493         rcu_assign_pointer(geneve->sock4, NULL);
1494         if (*gs4)
1495                 rcu_assign_sk_user_data((*gs4)->sock->sk, NULL);
1496 #if IS_ENABLED(CONFIG_IPV6)
1497         *gs6 = rtnl_dereference(geneve->sock6);
1498         rcu_assign_pointer(geneve->sock6, NULL);
1499         if (*gs6)
1500                 rcu_assign_sk_user_data((*gs6)->sock->sk, NULL);
1501 #else
1502         *gs6 = NULL;
1503 #endif
1504         synchronize_net();
1505 }
1506
1507 /* Resumes the geneve device data path for both TX and RX. */
1508 static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4,
1509                              struct geneve_sock __maybe_unused *gs6)
1510 {
1511         rcu_assign_pointer(geneve->sock4, gs4);
1512         if (gs4)
1513                 rcu_assign_sk_user_data(gs4->sock->sk, gs4);
1514 #if IS_ENABLED(CONFIG_IPV6)
1515         rcu_assign_pointer(geneve->sock6, gs6);
1516         if (gs6)
1517                 rcu_assign_sk_user_data(gs6->sock->sk, gs6);
1518 #endif
1519         synchronize_net();
1520 }
1521
1522 static int geneve_changelink(struct net_device *dev, struct nlattr *tb[],
1523                              struct nlattr *data[],
1524                              struct netlink_ext_ack *extack)
1525 {
1526         struct geneve_dev *geneve = netdev_priv(dev);
1527         struct geneve_sock *gs4, *gs6;
1528         struct ip_tunnel_info info;
1529         bool metadata;
1530         bool use_udp6_rx_checksums;
1531         bool ttl_inherit;
1532         int err;
1533
1534         /* If the geneve device is configured for metadata (or externally
1535          * controlled, for example, OVS), then nothing can be changed.
1536          */
1537         if (geneve->collect_md)
1538                 return -EOPNOTSUPP;
1539
1540         /* Start with the existing info. */
1541         memcpy(&info, &geneve->info, sizeof(info));
1542         metadata = geneve->collect_md;
1543         use_udp6_rx_checksums = geneve->use_udp6_rx_checksums;
1544         ttl_inherit = geneve->ttl_inherit;
1545         err = geneve_nl2info(tb, data, extack, &info, &metadata,
1546                              &use_udp6_rx_checksums, &ttl_inherit, true);
1547         if (err)
1548                 return err;
1549
1550         if (!geneve_dst_addr_equal(&geneve->info, &info)) {
1551                 dst_cache_reset(&info.dst_cache);
1552                 geneve_link_config(dev, &info, tb);
1553         }
1554
1555         geneve_quiesce(geneve, &gs4, &gs6);
1556         geneve->info = info;
1557         geneve->collect_md = metadata;
1558         geneve->use_udp6_rx_checksums = use_udp6_rx_checksums;
1559         geneve->ttl_inherit = ttl_inherit;
1560         geneve_unquiesce(geneve, gs4, gs6);
1561
1562         return 0;
1563 }
1564
1565 static void geneve_dellink(struct net_device *dev, struct list_head *head)
1566 {
1567         struct geneve_dev *geneve = netdev_priv(dev);
1568
1569         list_del(&geneve->next);
1570         unregister_netdevice_queue(dev, head);
1571 }
1572
1573 static size_t geneve_get_size(const struct net_device *dev)
1574 {
1575         return nla_total_size(sizeof(__u32)) +  /* IFLA_GENEVE_ID */
1576                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */
1577                 nla_total_size(sizeof(__u8)) +  /* IFLA_GENEVE_TTL */
1578                 nla_total_size(sizeof(__u8)) +  /* IFLA_GENEVE_TOS */
1579                 nla_total_size(sizeof(__be32)) +  /* IFLA_GENEVE_LABEL */
1580                 nla_total_size(sizeof(__be16)) +  /* IFLA_GENEVE_PORT */
1581                 nla_total_size(0) +      /* IFLA_GENEVE_COLLECT_METADATA */
1582                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */
1583                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */
1584                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */
1585                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL_INHERIT */
1586                 0;
1587 }
1588
1589 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
1590 {
1591         struct geneve_dev *geneve = netdev_priv(dev);
1592         struct ip_tunnel_info *info = &geneve->info;
1593         bool ttl_inherit = geneve->ttl_inherit;
1594         bool metadata = geneve->collect_md;
1595         __u8 tmp_vni[3];
1596         __u32 vni;
1597
1598         tunnel_id_to_vni(info->key.tun_id, tmp_vni);
1599         vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2];
1600         if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
1601                 goto nla_put_failure;
1602
1603         if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
1604                 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
1605                                     info->key.u.ipv4.dst))
1606                         goto nla_put_failure;
1607                 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM,
1608                                !!(info->key.tun_flags & TUNNEL_CSUM)))
1609                         goto nla_put_failure;
1610
1611 #if IS_ENABLED(CONFIG_IPV6)
1612         } else if (!metadata) {
1613                 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6,
1614                                      &info->key.u.ipv6.dst))
1615                         goto nla_put_failure;
1616                 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
1617                                !(info->key.tun_flags & TUNNEL_CSUM)))
1618                         goto nla_put_failure;
1619 #endif
1620         }
1621
1622         if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) ||
1623             nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) ||
1624             nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label))
1625                 goto nla_put_failure;
1626
1627         if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst))
1628                 goto nla_put_failure;
1629
1630         if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
1631                 goto nla_put_failure;
1632
1633 #if IS_ENABLED(CONFIG_IPV6)
1634         if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
1635                        !geneve->use_udp6_rx_checksums))
1636                 goto nla_put_failure;
1637 #endif
1638
1639         if (nla_put_u8(skb, IFLA_GENEVE_TTL_INHERIT, ttl_inherit))
1640                 goto nla_put_failure;
1641
1642         return 0;
1643
1644 nla_put_failure:
1645         return -EMSGSIZE;
1646 }
1647
1648 static struct rtnl_link_ops geneve_link_ops __read_mostly = {
1649         .kind           = "geneve",
1650         .maxtype        = IFLA_GENEVE_MAX,
1651         .policy         = geneve_policy,
1652         .priv_size      = sizeof(struct geneve_dev),
1653         .setup          = geneve_setup,
1654         .validate       = geneve_validate,
1655         .newlink        = geneve_newlink,
1656         .changelink     = geneve_changelink,
1657         .dellink        = geneve_dellink,
1658         .get_size       = geneve_get_size,
1659         .fill_info      = geneve_fill_info,
1660 };
1661
1662 struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
1663                                         u8 name_assign_type, u16 dst_port)
1664 {
1665         struct nlattr *tb[IFLA_MAX + 1];
1666         struct ip_tunnel_info info;
1667         struct net_device *dev;
1668         LIST_HEAD(list_kill);
1669         int err;
1670
1671         memset(tb, 0, sizeof(tb));
1672         dev = rtnl_create_link(net, name, name_assign_type,
1673                                &geneve_link_ops, tb);
1674         if (IS_ERR(dev))
1675                 return dev;
1676
1677         init_tnl_info(&info, dst_port);
1678         err = geneve_configure(net, dev, NULL, &info, true, true, false);
1679         if (err) {
1680                 free_netdev(dev);
1681                 return ERR_PTR(err);
1682         }
1683
1684         /* openvswitch users expect packet sizes to be unrestricted,
1685          * so set the largest MTU we can.
1686          */
1687         err = geneve_change_mtu(dev, IP_MAX_MTU);
1688         if (err)
1689                 goto err;
1690
1691         err = rtnl_configure_link(dev, NULL);
1692         if (err < 0)
1693                 goto err;
1694
1695         return dev;
1696 err:
1697         geneve_dellink(dev, &list_kill);
1698         unregister_netdevice_many(&list_kill);
1699         return ERR_PTR(err);
1700 }
1701 EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
1702
1703 static int geneve_netdevice_event(struct notifier_block *unused,
1704                                   unsigned long event, void *ptr)
1705 {
1706         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1707
1708         if (event == NETDEV_UDP_TUNNEL_PUSH_INFO ||
1709             event == NETDEV_UDP_TUNNEL_DROP_INFO) {
1710                 geneve_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO);
1711         } else if (event == NETDEV_UNREGISTER) {
1712                 geneve_offload_rx_ports(dev, false);
1713         } else if (event == NETDEV_REGISTER) {
1714                 geneve_offload_rx_ports(dev, true);
1715         }
1716
1717         return NOTIFY_DONE;
1718 }
1719
1720 static struct notifier_block geneve_notifier_block __read_mostly = {
1721         .notifier_call = geneve_netdevice_event,
1722 };
1723
1724 static __net_init int geneve_init_net(struct net *net)
1725 {
1726         struct geneve_net *gn = net_generic(net, geneve_net_id);
1727
1728         INIT_LIST_HEAD(&gn->geneve_list);
1729         INIT_LIST_HEAD(&gn->sock_list);
1730         return 0;
1731 }
1732
1733 static void geneve_destroy_tunnels(struct net *net, struct list_head *head)
1734 {
1735         struct geneve_net *gn = net_generic(net, geneve_net_id);
1736         struct geneve_dev *geneve, *next;
1737         struct net_device *dev, *aux;
1738
1739         /* gather any geneve devices that were moved into this ns */
1740         for_each_netdev_safe(net, dev, aux)
1741                 if (dev->rtnl_link_ops == &geneve_link_ops)
1742                         unregister_netdevice_queue(dev, head);
1743
1744         /* now gather any other geneve devices that were created in this ns */
1745         list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
1746                 /* If geneve->dev is in the same netns, it was already added
1747                  * to the list by the previous loop.
1748                  */
1749                 if (!net_eq(dev_net(geneve->dev), net))
1750                         unregister_netdevice_queue(geneve->dev, head);
1751         }
1752
1753         WARN_ON_ONCE(!list_empty(&gn->sock_list));
1754 }
1755
1756 static void __net_exit geneve_exit_batch_net(struct list_head *net_list)
1757 {
1758         struct net *net;
1759         LIST_HEAD(list);
1760
1761         rtnl_lock();
1762         list_for_each_entry(net, net_list, exit_list)
1763                 geneve_destroy_tunnels(net, &list);
1764
1765         /* unregister the devices gathered above */
1766         unregister_netdevice_many(&list);
1767         rtnl_unlock();
1768 }
1769
1770 static struct pernet_operations geneve_net_ops = {
1771         .init = geneve_init_net,
1772         .exit_batch = geneve_exit_batch_net,
1773         .id   = &geneve_net_id,
1774         .size = sizeof(struct geneve_net),
1775 };
1776
1777 static int __init geneve_init_module(void)
1778 {
1779         int rc;
1780
1781         rc = register_pernet_subsys(&geneve_net_ops);
1782         if (rc)
1783                 goto out1;
1784
1785         rc = register_netdevice_notifier(&geneve_notifier_block);
1786         if (rc)
1787                 goto out2;
1788
1789         rc = rtnl_link_register(&geneve_link_ops);
1790         if (rc)
1791                 goto out3;
1792
1793         return 0;
1794 out3:
1795         unregister_netdevice_notifier(&geneve_notifier_block);
1796 out2:
1797         unregister_pernet_subsys(&geneve_net_ops);
1798 out1:
1799         return rc;
1800 }
1801 late_initcall(geneve_init_module);
1802
1803 static void __exit geneve_cleanup_module(void)
1804 {
1805         rtnl_link_unregister(&geneve_link_ops);
1806         unregister_netdevice_notifier(&geneve_notifier_block);
1807         unregister_pernet_subsys(&geneve_net_ops);
1808 }
1809 module_exit(geneve_cleanup_module);
1810
1811 MODULE_LICENSE("GPL");
1812 MODULE_VERSION(GENEVE_NETDEV_VER);
1813 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
1814 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
1815 MODULE_ALIAS_RTNL_LINK("geneve");