drivers/net/geneve.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * GENEVE: Generic Network Virtualization Encapsulation
   4  *
   5  * Copyright (c) 2015 Red Hat, Inc.
   6  */
   7
   8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   9
  10 #include <linux/kernel.h>
  11 #include <linux/module.h>
  12 #include <linux/etherdevice.h>
  13 #include <linux/hash.h>
  14 #include <net/ipv6_stubs.h>
  15 #include <net/dst_metadata.h>
  16 #include <net/gro_cells.h>
  17 #include <net/rtnetlink.h>
  18 #include <net/geneve.h>
  19 #include <net/protocol.h>
  20
  21 #define GENEVE_NETDEV_VER       "0.6"
  22
  23 #define GENEVE_N_VID            (1u << 24)
  24 #define GENEVE_VID_MASK         (GENEVE_N_VID - 1)
  25
  26 #define VNI_HASH_BITS           10
  27 #define VNI_HASH_SIZE           (1<<VNI_HASH_BITS)
  28
  29 static bool log_ecn_error = true;
  30 module_param(log_ecn_error, bool, 0644);
  31 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
  32
  33 #define GENEVE_VER 0
  34 #define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr))
  35 #define GENEVE_IPV4_HLEN (ETH_HLEN + sizeof(struct iphdr) + GENEVE_BASE_HLEN)
  36 #define GENEVE_IPV6_HLEN (ETH_HLEN + sizeof(struct ipv6hdr) + GENEVE_BASE_HLEN)
  37
  38 /* per-network namespace private data for this module */
  39 struct geneve_net {
  40         struct list_head        geneve_list;
  41         struct list_head        sock_list;
  42 };
  43
  44 static unsigned int geneve_net_id;
  45
  46 struct geneve_dev_node {
  47         struct hlist_node hlist;
  48         struct geneve_dev *geneve;
  49 };
  50
  51 struct geneve_config {
  52         struct ip_tunnel_info   info;
  53         bool                    collect_md;
  54         bool                    use_udp6_rx_checksums;
  55         bool                    ttl_inherit;
  56         enum ifla_geneve_df     df;
  57 };
  58
  59 /* Pseudo network device */
  60 struct geneve_dev {
  61         struct geneve_dev_node hlist4;  /* vni hash table for IPv4 socket */
  62 #if IS_ENABLED(CONFIG_IPV6)
  63         struct geneve_dev_node hlist6;  /* vni hash table for IPv6 socket */
  64 #endif
  65         struct net         *net;        /* netns for packet i/o */
  66         struct net_device  *dev;        /* netdev for geneve tunnel */
  67         struct geneve_sock __rcu *sock4;        /* IPv4 socket used for geneve tunnel */
  68 #if IS_ENABLED(CONFIG_IPV6)
  69         struct geneve_sock __rcu *sock6;        /* IPv6 socket used for geneve tunnel */
  70 #endif
  71         struct list_head   next;        /* geneve's per namespace list */
  72         struct gro_cells   gro_cells;
  73         struct geneve_config cfg;
  74 };
  75
  76 struct geneve_sock {
  77         bool                    collect_md;
  78         struct list_head        list;
  79         struct socket           *sock;
  80         struct rcu_head         rcu;
  81         int                     refcnt;
  82         struct hlist_head       vni_list[VNI_HASH_SIZE];
  83 };
  84
  85 static inline __u32 geneve_net_vni_hash(u8 vni[3])
  86 {
  87         __u32 vnid;
  88
  89         vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2];
  90         return hash_32(vnid, VNI_HASH_BITS);
  91 }
  92
  93 static __be64 vni_to_tunnel_id(const __u8 *vni)
  94 {
  95 #ifdef __BIG_ENDIAN
  96         return (vni[0] << 16) | (vni[1] << 8) | vni[2];
  97 #else
  98         return (__force __be64)(((__force u64)vni[0] << 40) |
  99                                 ((__force u64)vni[1] << 48) |
 100                                 ((__force u64)vni[2] << 56));
 101 #endif
 102 }
 103
 104 /* Convert 64 bit tunnel ID to 24 bit VNI. */
 105 static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni)
 106 {
 107 #ifdef __BIG_ENDIAN
 108         vni[0] = (__force __u8)(tun_id >> 16);
 109         vni[1] = (__force __u8)(tun_id >> 8);
 110         vni[2] = (__force __u8)tun_id;
 111 #else
 112         vni[0] = (__force __u8)((__force u64)tun_id >> 40);
 113         vni[1] = (__force __u8)((__force u64)tun_id >> 48);
 114         vni[2] = (__force __u8)((__force u64)tun_id >> 56);
 115 #endif
 116 }
 117
 118 static bool eq_tun_id_and_vni(u8 *tun_id, u8 *vni)
 119 {
 120         return !memcmp(vni, &tun_id[5], 3);
 121 }
 122
 123 static sa_family_t geneve_get_sk_family(struct geneve_sock *gs)
 124 {
 125         return gs->sock->sk->sk_family;
 126 }
 127
 128 static struct geneve_dev *geneve_lookup(struct geneve_sock *gs,
 129                                         __be32 addr, u8 vni[])
 130 {
 131         struct hlist_head *vni_list_head;
 132         struct geneve_dev_node *node;
 133         __u32 hash;
 134
 135         /* Find the device for this VNI */
 136         hash = geneve_net_vni_hash(vni);
 137         vni_list_head = &gs->vni_list[hash];
 138         hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
 139                 if (eq_tun_id_and_vni((u8 *)&node->geneve->cfg.info.key.tun_id, vni) &&
 140                     addr == node->geneve->cfg.info.key.u.ipv4.dst)
 141                         return node->geneve;
 142         }
 143         return NULL;
 144 }
 145
 146 #if IS_ENABLED(CONFIG_IPV6)
 147 static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs,
 148                                          struct in6_addr addr6, u8 vni[])
 149 {
 150         struct hlist_head *vni_list_head;
 151         struct geneve_dev_node *node;
 152         __u32 hash;
 153
 154         /* Find the device for this VNI */
 155         hash = geneve_net_vni_hash(vni);
 156         vni_list_head = &gs->vni_list[hash];
 157         hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
 158                 if (eq_tun_id_and_vni((u8 *)&node->geneve->cfg.info.key.tun_id, vni) &&
 159                     ipv6_addr_equal(&addr6, &node->geneve->cfg.info.key.u.ipv6.dst))
 160                         return node->geneve;
 161         }
 162         return NULL;
 163 }
 164 #endif
 165
 166 static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
 167 {
 168         return (struct genevehdr *)(udp_hdr(skb) + 1);
 169 }
 170
 171 static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs,
 172                                             struct sk_buff *skb)
 173 {
 174         static u8 zero_vni[3];
 175         u8 *vni;
 176
 177         if (geneve_get_sk_family(gs) == AF_INET) {
 178                 struct iphdr *iph;
 179                 __be32 addr;
 180
 181                 iph = ip_hdr(skb); /* outer IP header... */
 182
 183                 if (gs->collect_md) {
 184                         vni = zero_vni;
 185                         addr = 0;
 186                 } else {
 187                         vni = geneve_hdr(skb)->vni;
 188                         addr = iph->saddr;
 189                 }
 190
 191                 return geneve_lookup(gs, addr, vni);
 192 #if IS_ENABLED(CONFIG_IPV6)
 193         } else if (geneve_get_sk_family(gs) == AF_INET6) {
 194                 static struct in6_addr zero_addr6;
 195                 struct ipv6hdr *ip6h;
 196                 struct in6_addr addr6;
 197
 198                 ip6h = ipv6_hdr(skb); /* outer IPv6 header... */
 199
 200                 if (gs->collect_md) {
 201                         vni = zero_vni;
 202                         addr6 = zero_addr6;
 203                 } else {
 204                         vni = geneve_hdr(skb)->vni;
 205                         addr6 = ip6h->saddr;
 206                 }
 207
 208                 return geneve6_lookup(gs, addr6, vni);
 209 #endif
 210         }
 211         return NULL;
 212 }
 213
 214 /* geneve receive/decap routine */
 215 static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs,
 216                       struct sk_buff *skb)
 217 {
 218         struct genevehdr *gnvh = geneve_hdr(skb);
 219         struct metadata_dst *tun_dst = NULL;
 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 | (gnvh->oam ? TUNNEL_OAM : 0) |
 228                         (gnvh->critical ? TUNNEL_CRIT_OPT : 0);
 229
 230                 tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags,
 231                                          vni_to_tunnel_id(gnvh->vni),
 232                                          gnvh->opt_len * 4);
 233                 if (!tun_dst) {
 234                         geneve->dev->stats.rx_dropped++;
 235                         goto drop;
 236                 }
 237                 /* Update tunnel dst according to Geneve options. */
 238                 ip_tunnel_info_opts_set(&tun_dst->u.tun_info,
 239                                         gnvh->options, gnvh->opt_len * 4,
 240                                         TUNNEL_GENEVE_OPT);
 241         } else {
 242                 /* Drop packets w/ critical options,
 243                  * since we don't support any...
 244                  */
 245                 if (gnvh->critical) {
 246                         geneve->dev->stats.rx_frame_errors++;
 247                         geneve->dev->stats.rx_errors++;
 248                         goto drop;
 249                 }
 250         }
 251
 252         skb_reset_mac_header(skb);
 253         skb->protocol = eth_type_trans(skb, geneve->dev);
 254         skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
 255
 256         if (tun_dst)
 257                 skb_dst_set(skb, &tun_dst->dst);
 258
 259         /* Ignore packet loops (and multicast echo) */
 260         if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr)) {
 261                 geneve->dev->stats.rx_errors++;
 262                 goto drop;
 263         }
 264
 265         oiph = skb_network_header(skb);
 266         skb_reset_network_header(skb);
 267
 268         if (geneve_get_sk_family(gs) == AF_INET)
 269                 err = IP_ECN_decapsulate(oiph, skb);
 270 #if IS_ENABLED(CONFIG_IPV6)
 271         else
 272                 err = IP6_ECN_decapsulate(oiph, skb);
 273 #endif
 274
 275         if (unlikely(err)) {
 276                 if (log_ecn_error) {
 277                         if (geneve_get_sk_family(gs) == AF_INET)
 278                                 net_info_ratelimited("non-ECT from %pI4 "
 279                                                      "with TOS=%#x\n",
 280                                                      &((struct iphdr *)oiph)->saddr,
 281                                                      ((struct iphdr *)oiph)->tos);
 282 #if IS_ENABLED(CONFIG_IPV6)
 283                         else
 284                                 net_info_ratelimited("non-ECT from %pI6\n",
 285                                                      &((struct ipv6hdr *)oiph)->saddr);
 286 #endif
 287                 }
 288                 if (err > 1) {
 289                         ++geneve->dev->stats.rx_frame_errors;
 290                         ++geneve->dev->stats.rx_errors;
 291                         goto drop;
 292                 }
 293         }
 294
 295         len = skb->len;
 296         err = gro_cells_receive(&geneve->gro_cells, skb);
 297         if (likely(err == NET_RX_SUCCESS))
 298                 dev_sw_netstats_rx_add(geneve->dev, len);
 299
 300         return;
 301 drop:
 302         /* Consume bad packet */
 303         kfree_skb(skb);
 304 }
 305
 306 /* Setup stats when device is created */
 307 static int geneve_init(struct net_device *dev)
 308 {
 309         struct geneve_dev *geneve = netdev_priv(dev);
 310         int err;
 311
 312         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
 313         if (!dev->tstats)
 314                 return -ENOMEM;
 315
 316         err = gro_cells_init(&geneve->gro_cells, dev);
 317         if (err) {
 318                 free_percpu(dev->tstats);
 319                 return err;
 320         }
 321
 322         err = dst_cache_init(&geneve->cfg.info.dst_cache, GFP_KERNEL);
 323         if (err) {
 324                 free_percpu(dev->tstats);
 325                 gro_cells_destroy(&geneve->gro_cells);
 326                 return err;
 327         }
 328         return 0;
 329 }
 330
 331 static void geneve_uninit(struct net_device *dev)
 332 {
 333         struct geneve_dev *geneve = netdev_priv(dev);
 334
 335         dst_cache_destroy(&geneve->cfg.info.dst_cache);
 336         gro_cells_destroy(&geneve->gro_cells);
 337         free_percpu(dev->tstats);
 338 }
 339
 340 /* Callback from net/ipv4/udp.c to receive packets */
 341 static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
 342 {
 343         struct genevehdr *geneveh;
 344         struct geneve_dev *geneve;
 345         struct geneve_sock *gs;
 346         int opts_len;
 347
 348         /* Need UDP and Geneve header to be present */
 349         if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
 350                 goto drop;
 351
 352         /* Return packets with reserved bits set */
 353         geneveh = geneve_hdr(skb);
 354         if (unlikely(geneveh->ver != GENEVE_VER))
 355                 goto drop;
 356
 357         if (unlikely(geneveh->proto_type != htons(ETH_P_TEB)))
 358                 goto drop;
 359
 360         gs = rcu_dereference_sk_user_data(sk);
 361         if (!gs)
 362                 goto drop;
 363
 364         geneve = geneve_lookup_skb(gs, skb);
 365         if (!geneve)
 366                 goto drop;
 367
 368         opts_len = geneveh->opt_len * 4;
 369         if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len,
 370                                  htons(ETH_P_TEB),
 371                                  !net_eq(geneve->net, dev_net(geneve->dev)))) {
 372                 geneve->dev->stats.rx_dropped++;
 373                 goto drop;
 374         }
 375
 376         geneve_rx(geneve, gs, skb);
 377         return 0;
 378
 379 drop:
 380         /* Consume bad packet */
 381         kfree_skb(skb);
 382         return 0;
 383 }
 384
 385 /* Callback from net/ipv{4,6}/udp.c to check that we have a tunnel for errors */
 386 static int geneve_udp_encap_err_lookup(struct sock *sk, struct sk_buff *skb)
 387 {
 388         struct genevehdr *geneveh;
 389         struct geneve_sock *gs;
 390         u8 zero_vni[3] = { 0 };
 391         u8 *vni = zero_vni;
 392
 393         if (!pskb_may_pull(skb, skb_transport_offset(skb) + GENEVE_BASE_HLEN))
 394                 return -EINVAL;
 395
 396         geneveh = geneve_hdr(skb);
 397         if (geneveh->ver != GENEVE_VER)
 398                 return -EINVAL;
 399
 400         if (geneveh->proto_type != htons(ETH_P_TEB))
 401                 return -EINVAL;
 402
 403         gs = rcu_dereference_sk_user_data(sk);
 404         if (!gs)
 405                 return -ENOENT;
 406
 407         if (geneve_get_sk_family(gs) == AF_INET) {
 408                 struct iphdr *iph = ip_hdr(skb);
 409                 __be32 addr4 = 0;
 410
 411                 if (!gs->collect_md) {
 412                         vni = geneve_hdr(skb)->vni;
 413                         addr4 = iph->daddr;
 414                 }
 415
 416                 return geneve_lookup(gs, addr4, vni) ? 0 : -ENOENT;
 417         }
 418
 419 #if IS_ENABLED(CONFIG_IPV6)
 420         if (geneve_get_sk_family(gs) == AF_INET6) {
 421                 struct ipv6hdr *ip6h = ipv6_hdr(skb);
 422                 struct in6_addr addr6;
 423
 424                 memset(&addr6, 0, sizeof(struct in6_addr));
 425
 426                 if (!gs->collect_md) {
 427                         vni = geneve_hdr(skb)->vni;
 428                         addr6 = ip6h->daddr;
 429                 }
 430
 431                 return geneve6_lookup(gs, addr6, vni) ? 0 : -ENOENT;
 432         }
 433 #endif
 434
 435         return -EPFNOSUPPORT;
 436 }
 437
 438 static struct socket *geneve_create_sock(struct net *net, bool ipv6,
 439                                          __be16 port, bool ipv6_rx_csum)
 440 {
 441         struct socket *sock;
 442         struct udp_port_cfg udp_conf;
 443         int err;
 444
 445         memset(&udp_conf, 0, sizeof(udp_conf));
 446
 447         if (ipv6) {
 448                 udp_conf.family = AF_INET6;
 449                 udp_conf.ipv6_v6only = 1;
 450                 udp_conf.use_udp6_rx_checksums = ipv6_rx_csum;
 451         } else {
 452                 udp_conf.family = AF_INET;
 453                 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
 454         }
 455
 456         udp_conf.local_udp_port = port;
 457
 458         /* Open UDP socket */
 459         err = udp_sock_create(net, &udp_conf, &sock);
 460         if (err < 0)
 461                 return ERR_PTR(err);
 462
 463         return sock;
 464 }
 465
 466 static int geneve_hlen(struct genevehdr *gh)
 467 {
 468         return sizeof(*gh) + gh->opt_len * 4;
 469 }
 470
 471 static struct sk_buff *geneve_gro_receive(struct sock *sk,
 472                                           struct list_head *head,
 473                                           struct sk_buff *skb)
 474 {
 475         struct sk_buff *pp = NULL;
 476         struct sk_buff *p;
 477         struct genevehdr *gh, *gh2;
 478         unsigned int hlen, gh_len, off_gnv;
 479         const struct packet_offload *ptype;
 480         __be16 type;
 481         int flush = 1;
 482
 483         off_gnv = skb_gro_offset(skb);
 484         hlen = off_gnv + sizeof(*gh);
 485         gh = skb_gro_header_fast(skb, off_gnv);
 486         if (skb_gro_header_hard(skb, hlen)) {
 487                 gh = skb_gro_header_slow(skb, hlen, off_gnv);
 488                 if (unlikely(!gh))
 489                         goto out;
 490         }
 491
 492         if (gh->ver != GENEVE_VER || gh->oam)
 493                 goto out;
 494         gh_len = geneve_hlen(gh);
 495
 496         hlen = off_gnv + gh_len;
 497         if (skb_gro_header_hard(skb, hlen)) {
 498                 gh = skb_gro_header_slow(skb, hlen, off_gnv);
 499                 if (unlikely(!gh))
 500                         goto out;
 501         }
 502
 503         list_for_each_entry(p, head, list) {
 504                 if (!NAPI_GRO_CB(p)->same_flow)
 505                         continue;
 506
 507                 gh2 = (struct genevehdr *)(p->data + off_gnv);
 508                 if (gh->opt_len != gh2->opt_len ||
 509                     memcmp(gh, gh2, gh_len)) {
 510                         NAPI_GRO_CB(p)->same_flow = 0;
 511                         continue;
 512                 }
 513         }
 514
 515         type = gh->proto_type;
 516
 517         rcu_read_lock();
 518         ptype = gro_find_receive_by_type(type);
 519         if (!ptype)
 520                 goto out_unlock;
 521
 522         skb_gro_pull(skb, gh_len);
 523         skb_gro_postpull_rcsum(skb, gh, gh_len);
 524         pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
 525         flush = 0;
 526
 527 out_unlock:
 528         rcu_read_unlock();
 529 out:
 530         skb_gro_flush_final(skb, pp, flush);
 531
 532         return pp;
 533 }
 534
 535 static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb,
 536                                int nhoff)
 537 {
 538         struct genevehdr *gh;
 539         struct packet_offload *ptype;
 540         __be16 type;
 541         int gh_len;
 542         int err = -ENOSYS;
 543
 544         gh = (struct genevehdr *)(skb->data + nhoff);
 545         gh_len = geneve_hlen(gh);
 546         type = gh->proto_type;
 547
 548         rcu_read_lock();
 549         ptype = gro_find_complete_by_type(type);
 550         if (ptype)
 551                 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
 552
 553         rcu_read_unlock();
 554
 555         skb_set_inner_mac_header(skb, nhoff + gh_len);
 556
 557         return err;
 558 }
 559
 560 /* Create new listen socket if needed */
 561 static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
 562                                                 bool ipv6, bool ipv6_rx_csum)
 563 {
 564         struct geneve_net *gn = net_generic(net, geneve_net_id);
 565         struct geneve_sock *gs;
 566         struct socket *sock;
 567         struct udp_tunnel_sock_cfg tunnel_cfg;
 568         int h;
 569
 570         gs = kzalloc(sizeof(*gs), GFP_KERNEL);
 571         if (!gs)
 572                 return ERR_PTR(-ENOMEM);
 573
 574         sock = geneve_create_sock(net, ipv6, port, ipv6_rx_csum);
 575         if (IS_ERR(sock)) {
 576                 kfree(gs);
 577                 return ERR_CAST(sock);
 578         }
 579
 580         gs->sock = sock;
 581         gs->refcnt = 1;
 582         for (h = 0; h < VNI_HASH_SIZE; ++h)
 583                 INIT_HLIST_HEAD(&gs->vni_list[h]);
 584
 585         /* Initialize the geneve udp offloads structure */
 586         udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
 587
 588         /* Mark socket as an encapsulation socket */
 589         memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
 590         tunnel_cfg.sk_user_data = gs;
 591         tunnel_cfg.encap_type = 1;
 592         tunnel_cfg.gro_receive = geneve_gro_receive;
 593         tunnel_cfg.gro_complete = geneve_gro_complete;
 594         tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
 595         tunnel_cfg.encap_err_lookup = geneve_udp_encap_err_lookup;
 596         tunnel_cfg.encap_destroy = NULL;
 597         setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
 598         list_add(&gs->list, &gn->sock_list);
 599         return gs;
 600 }
 601
 602 static void __geneve_sock_release(struct geneve_sock *gs)
 603 {
 604         if (!gs || --gs->refcnt)
 605                 return;
 606
 607         list_del(&gs->list);
 608         udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
 609         udp_tunnel_sock_release(gs->sock);
 610         kfree_rcu(gs, rcu);
 611 }
 612
 613 static void geneve_sock_release(struct geneve_dev *geneve)
 614 {
 615         struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4);
 616 #if IS_ENABLED(CONFIG_IPV6)
 617         struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6);
 618
 619         rcu_assign_pointer(geneve->sock6, NULL);
 620 #endif
 621
 622         rcu_assign_pointer(geneve->sock4, NULL);
 623         synchronize_net();
 624
 625         __geneve_sock_release(gs4);
 626 #if IS_ENABLED(CONFIG_IPV6)
 627         __geneve_sock_release(gs6);
 628 #endif
 629 }
 630
 631 static struct geneve_sock *geneve_find_sock(struct geneve_net *gn,
 632                                             sa_family_t family,
 633                                             __be16 dst_port)
 634 {
 635         struct geneve_sock *gs;
 636
 637         list_for_each_entry(gs, &gn->sock_list, list) {
 638                 if (inet_sk(gs->sock->sk)->inet_sport == dst_port &&
 639                     geneve_get_sk_family(gs) == family) {
 640                         return gs;
 641                 }
 642         }
 643         return NULL;
 644 }
 645
 646 static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6)
 647 {
 648         struct net *net = geneve->net;
 649         struct geneve_net *gn = net_generic(net, geneve_net_id);
 650         struct geneve_dev_node *node;
 651         struct geneve_sock *gs;
 652         __u8 vni[3];
 653         __u32 hash;
 654
 655         gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->cfg.info.key.tp_dst);
 656         if (gs) {
 657                 gs->refcnt++;
 658                 goto out;
 659         }
 660
 661         gs = geneve_socket_create(net, geneve->cfg.info.key.tp_dst, ipv6,
 662                                   geneve->cfg.use_udp6_rx_checksums);
 663         if (IS_ERR(gs))
 664                 return PTR_ERR(gs);
 665
 666 out:
 667         gs->collect_md = geneve->cfg.collect_md;
 668 #if IS_ENABLED(CONFIG_IPV6)
 669         if (ipv6) {
 670                 rcu_assign_pointer(geneve->sock6, gs);
 671                 node = &geneve->hlist6;
 672         } else
 673 #endif
 674         {
 675                 rcu_assign_pointer(geneve->sock4, gs);
 676                 node = &geneve->hlist4;
 677         }
 678         node->geneve = geneve;
 679
 680         tunnel_id_to_vni(geneve->cfg.info.key.tun_id, vni);
 681         hash = geneve_net_vni_hash(vni);
 682         hlist_add_head_rcu(&node->hlist, &gs->vni_list[hash]);
 683         return 0;
 684 }
 685
 686 static int geneve_open(struct net_device *dev)
 687 {
 688         struct geneve_dev *geneve = netdev_priv(dev);
 689         bool metadata = geneve->cfg.collect_md;
 690         bool ipv4, ipv6;
 691         int ret = 0;
 692
 693         ipv6 = geneve->cfg.info.mode & IP_TUNNEL_INFO_IPV6 || metadata;
 694         ipv4 = !ipv6 || metadata;
 695 #if IS_ENABLED(CONFIG_IPV6)
 696         if (ipv6) {
 697                 ret = geneve_sock_add(geneve, true);
 698                 if (ret < 0 && ret != -EAFNOSUPPORT)
 699                         ipv4 = false;
 700         }
 701 #endif
 702         if (ipv4)
 703                 ret = geneve_sock_add(geneve, false);
 704         if (ret < 0)
 705                 geneve_sock_release(geneve);
 706
 707         return ret;
 708 }
 709
 710 static int geneve_stop(struct net_device *dev)
 711 {
 712         struct geneve_dev *geneve = netdev_priv(dev);
 713
 714         hlist_del_init_rcu(&geneve->hlist4.hlist);
 715 #if IS_ENABLED(CONFIG_IPV6)
 716         hlist_del_init_rcu(&geneve->hlist6.hlist);
 717 #endif
 718         geneve_sock_release(geneve);
 719         return 0;
 720 }
 721
 722 static void geneve_build_header(struct genevehdr *geneveh,
 723                                 const struct ip_tunnel_info *info)
 724 {
 725         geneveh->ver = GENEVE_VER;
 726         geneveh->opt_len = info->options_len / 4;
 727         geneveh->oam = !!(info->key.tun_flags & TUNNEL_OAM);
 728         geneveh->critical = !!(info->key.tun_flags & TUNNEL_CRIT_OPT);
 729         geneveh->rsvd1 = 0;
 730         tunnel_id_to_vni(info->key.tun_id, geneveh->vni);
 731         geneveh->proto_type = htons(ETH_P_TEB);
 732         geneveh->rsvd2 = 0;
 733
 734         if (info->key.tun_flags & TUNNEL_GENEVE_OPT)
 735                 ip_tunnel_info_opts_get(geneveh->options, info);
 736 }
 737
 738 static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb,
 739                             const struct ip_tunnel_info *info,
 740                             bool xnet, int ip_hdr_len)
 741 {
 742         bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
 743         struct genevehdr *gnvh;
 744         int min_headroom;
 745         int err;
 746
 747         skb_reset_mac_header(skb);
 748         skb_scrub_packet(skb, xnet);
 749
 750         min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len +
 751                        GENEVE_BASE_HLEN + info->options_len + ip_hdr_len;
 752         err = skb_cow_head(skb, min_headroom);
 753         if (unlikely(err))
 754                 goto free_dst;
 755
 756         err = udp_tunnel_handle_offloads(skb, udp_sum);
 757         if (err)
 758                 goto free_dst;
 759
 760         gnvh = __skb_push(skb, sizeof(*gnvh) + info->options_len);
 761         geneve_build_header(gnvh, info);
 762         skb_set_inner_protocol(skb, htons(ETH_P_TEB));
 763         return 0;
 764
 765 free_dst:
 766         dst_release(dst);
 767         return err;
 768 }
 769
 770 static struct rtable *geneve_get_v4_rt(struct sk_buff *skb,
 771                                        struct net_device *dev,
 772                                        struct geneve_sock *gs4,
 773                                        struct flowi4 *fl4,
 774                                        const struct ip_tunnel_info *info,
 775                                        __be16 dport, __be16 sport,
 776                                        __u8 *full_tos)
 777 {
 778         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
 779         struct geneve_dev *geneve = netdev_priv(dev);
 780         struct dst_cache *dst_cache;
 781         struct rtable *rt = NULL;
 782         __u8 tos;
 783
 784         if (!gs4)
 785                 return ERR_PTR(-EIO);
 786
 787         memset(fl4, 0, sizeof(*fl4));
 788         fl4->flowi4_mark = skb->mark;
 789         fl4->flowi4_proto = IPPROTO_UDP;
 790         fl4->daddr = info->key.u.ipv4.dst;
 791         fl4->saddr = info->key.u.ipv4.src;
 792         fl4->fl4_dport = dport;
 793         fl4->fl4_sport = sport;
 794
 795         tos = info->key.tos;
 796         if ((tos == 1) && !geneve->cfg.collect_md) {
 797                 tos = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
 798                 use_cache = false;
 799         }
 800         fl4->flowi4_tos = RT_TOS(tos);
 801         if (full_tos)
 802                 *full_tos = tos;
 803
 804         dst_cache = (struct dst_cache *)&info->dst_cache;
 805         if (use_cache) {
 806                 rt = dst_cache_get_ip4(dst_cache, &fl4->saddr);
 807                 if (rt)
 808                         return rt;
 809         }
 810         rt = ip_route_output_key(geneve->net, fl4);
 811         if (IS_ERR(rt)) {
 812                 netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr);
 813                 return ERR_PTR(-ENETUNREACH);
 814         }
 815         if (rt->dst.dev == dev) { /* is this necessary? */
 816                 netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr);
 817                 ip_rt_put(rt);
 818                 return ERR_PTR(-ELOOP);
 819         }
 820         if (use_cache)
 821                 dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr);
 822         return rt;
 823 }
 824
 825 #if IS_ENABLED(CONFIG_IPV6)
 826 static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb,
 827                                            struct net_device *dev,
 828                                            struct geneve_sock *gs6,
 829                                            struct flowi6 *fl6,
 830                                            const struct ip_tunnel_info *info,
 831                                            __be16 dport, __be16 sport)
 832 {
 833         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
 834         struct geneve_dev *geneve = netdev_priv(dev);
 835         struct dst_entry *dst = NULL;
 836         struct dst_cache *dst_cache;
 837         __u8 prio;
 838
 839         if (!gs6)
 840                 return ERR_PTR(-EIO);
 841
 842         memset(fl6, 0, sizeof(*fl6));
 843         fl6->flowi6_mark = skb->mark;
 844         fl6->flowi6_proto = IPPROTO_UDP;
 845         fl6->daddr = info->key.u.ipv6.dst;
 846         fl6->saddr = info->key.u.ipv6.src;
 847         fl6->fl6_dport = dport;
 848         fl6->fl6_sport = sport;
 849
 850         prio = info->key.tos;
 851         if ((prio == 1) && !geneve->cfg.collect_md) {
 852                 prio = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
 853                 use_cache = false;
 854         }
 855
 856         fl6->flowlabel = ip6_make_flowinfo(prio, info->key.label);
 857         dst_cache = (struct dst_cache *)&info->dst_cache;
 858         if (use_cache) {
 859                 dst = dst_cache_get_ip6(dst_cache, &fl6->saddr);
 860                 if (dst)
 861                         return dst;
 862         }
 863         dst = ipv6_stub->ipv6_dst_lookup_flow(geneve->net, gs6->sock->sk, fl6,
 864                                               NULL);
 865         if (IS_ERR(dst)) {
 866                 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr);
 867                 return ERR_PTR(-ENETUNREACH);
 868         }
 869         if (dst->dev == dev) { /* is this necessary? */
 870                 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr);
 871                 dst_release(dst);
 872                 return ERR_PTR(-ELOOP);
 873         }
 874
 875         if (use_cache)
 876                 dst_cache_set_ip6(dst_cache, dst, &fl6->saddr);
 877         return dst;
 878 }
 879 #endif
 880
 881 static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
 882                            struct geneve_dev *geneve,
 883                            const struct ip_tunnel_info *info)
 884 {
 885         bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
 886         struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
 887         const struct ip_tunnel_key *key = &info->key;
 888         struct rtable *rt;
 889         struct flowi4 fl4;
 890         __u8 full_tos;
 891         __u8 tos, ttl;
 892         __be16 df = 0;
 893         __be16 sport;
 894         int err;
 895
 896         if (!pskb_inet_may_pull(skb))
 897                 return -EINVAL;
 898
 899         sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
 900         rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info,
 901                               geneve->cfg.info.key.tp_dst, sport, &full_tos);
 902         if (IS_ERR(rt))
 903                 return PTR_ERR(rt);
 904
 905         err = skb_tunnel_check_pmtu(skb, &rt->dst,
 906                                     GENEVE_IPV4_HLEN + info->options_len,
 907                                     netif_is_any_bridge_port(dev));
 908         if (err < 0) {
 909                 dst_release(&rt->dst);
 910                 return err;
 911         } else if (err) {
 912                 struct ip_tunnel_info *info;
 913
 914                 info = skb_tunnel_info(skb);
 915                 if (info) {
 916                         struct ip_tunnel_info *unclone;
 917
 918                         unclone = skb_tunnel_info_unclone(skb);
 919                         if (unlikely(!unclone)) {
 920                                 dst_release(&rt->dst);
 921                                 return -ENOMEM;
 922                         }
 923
 924                         unclone->key.u.ipv4.dst = fl4.saddr;
 925                         unclone->key.u.ipv4.src = fl4.daddr;
 926                 }
 927
 928                 if (!pskb_may_pull(skb, ETH_HLEN)) {
 929                         dst_release(&rt->dst);
 930                         return -EINVAL;
 931                 }
 932
 933                 skb->protocol = eth_type_trans(skb, geneve->dev);
 934                 netif_rx(skb);
 935                 dst_release(&rt->dst);
 936                 return -EMSGSIZE;
 937         }
 938
 939         if (geneve->cfg.collect_md) {
 940                 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
 941                 ttl = key->ttl;
 942
 943                 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
 944         } else {
 945                 tos = ip_tunnel_ecn_encap(full_tos, ip_hdr(skb), skb);
 946                 if (geneve->cfg.ttl_inherit)
 947                         ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb);
 948                 else
 949                         ttl = key->ttl;
 950                 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
 951
 952                 if (geneve->cfg.df == GENEVE_DF_SET) {
 953                         df = htons(IP_DF);
 954                 } else if (geneve->cfg.df == GENEVE_DF_INHERIT) {
 955                         struct ethhdr *eth = eth_hdr(skb);
 956
 957                         if (ntohs(eth->h_proto) == ETH_P_IPV6) {
 958                                 df = htons(IP_DF);
 959                         } else if (ntohs(eth->h_proto) == ETH_P_IP) {
 960                                 struct iphdr *iph = ip_hdr(skb);
 961
 962                                 if (iph->frag_off & htons(IP_DF))
 963                                         df = htons(IP_DF);
 964                         }
 965                 }
 966         }
 967
 968         err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr));
 969         if (unlikely(err))
 970                 return err;
 971
 972         udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr,
 973                             tos, ttl, df, sport, geneve->cfg.info.key.tp_dst,
 974                             !net_eq(geneve->net, dev_net(geneve->dev)),
 975                             !(info->key.tun_flags & TUNNEL_CSUM));
 976         return 0;
 977 }
 978
 979 #if IS_ENABLED(CONFIG_IPV6)
 980 static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
 981                             struct geneve_dev *geneve,
 982                             const struct ip_tunnel_info *info)
 983 {
 984         bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
 985         struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
 986         const struct ip_tunnel_key *key = &info->key;
 987         struct dst_entry *dst = NULL;
 988         struct flowi6 fl6;
 989         __u8 prio, ttl;
 990         __be16 sport;
 991         int err;
 992
 993         if (!pskb_inet_may_pull(skb))
 994                 return -EINVAL;
 995
 996         sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
 997         dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info,
 998                                 geneve->cfg.info.key.tp_dst, sport);
 999         if (IS_ERR(dst))
1000                 return PTR_ERR(dst);
1001
1002         err = skb_tunnel_check_pmtu(skb, dst,
1003                                     GENEVE_IPV6_HLEN + info->options_len,
1004                                     netif_is_any_bridge_port(dev));
1005         if (err < 0) {
1006                 dst_release(dst);
1007                 return err;
1008         } else if (err) {
1009                 struct ip_tunnel_info *info = skb_tunnel_info(skb);
1010
1011                 if (info) {
1012                         struct ip_tunnel_info *unclone;
1013
1014                         unclone = skb_tunnel_info_unclone(skb);
1015                         if (unlikely(!unclone)) {
1016                                 dst_release(dst);
1017                                 return -ENOMEM;
1018                         }
1019
1020                         unclone->key.u.ipv6.dst = fl6.saddr;
1021                         unclone->key.u.ipv6.src = fl6.daddr;
1022                 }
1023
1024                 if (!pskb_may_pull(skb, ETH_HLEN)) {
1025                         dst_release(dst);
1026                         return -EINVAL;
1027                 }
1028
1029                 skb->protocol = eth_type_trans(skb, geneve->dev);
1030                 netif_rx(skb);
1031                 dst_release(dst);
1032                 return -EMSGSIZE;
1033         }
1034
1035         if (geneve->cfg.collect_md) {
1036                 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
1037                 ttl = key->ttl;
1038         } else {
1039                 prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel),
1040                                            ip_hdr(skb), skb);
1041                 if (geneve->cfg.ttl_inherit)
1042                         ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb);
1043                 else
1044                         ttl = key->ttl;
1045                 ttl = ttl ? : ip6_dst_hoplimit(dst);
1046         }
1047         err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr));
1048         if (unlikely(err))
1049                 return err;
1050
1051         udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
1052                              &fl6.saddr, &fl6.daddr, prio, ttl,
1053                              info->key.label, sport, geneve->cfg.info.key.tp_dst,
1054                              !(info->key.tun_flags & TUNNEL_CSUM));
1055         return 0;
1056 }
1057 #endif
1058
1059 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
1060 {
1061         struct geneve_dev *geneve = netdev_priv(dev);
1062         struct ip_tunnel_info *info = NULL;
1063         int err;
1064
1065         if (geneve->cfg.collect_md) {
1066                 info = skb_tunnel_info(skb);
1067                 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
1068                         netdev_dbg(dev, "no tunnel metadata\n");
1069                         dev_kfree_skb(skb);
1070                         dev->stats.tx_dropped++;
1071                         return NETDEV_TX_OK;
1072                 }
1073         } else {
1074                 info = &geneve->cfg.info;
1075         }
1076
1077         rcu_read_lock();
1078 #if IS_ENABLED(CONFIG_IPV6)
1079         if (info->mode & IP_TUNNEL_INFO_IPV6)
1080                 err = geneve6_xmit_skb(skb, dev, geneve, info);
1081         else
1082 #endif
1083                 err = geneve_xmit_skb(skb, dev, geneve, info);
1084         rcu_read_unlock();
1085
1086         if (likely(!err))
1087                 return NETDEV_TX_OK;
1088
1089         if (err != -EMSGSIZE)
1090                 dev_kfree_skb(skb);
1091
1092         if (err == -ELOOP)
1093                 dev->stats.collisions++;
1094         else if (err == -ENETUNREACH)
1095                 dev->stats.tx_carrier_errors++;
1096
1097         dev->stats.tx_errors++;
1098         return NETDEV_TX_OK;
1099 }
1100
1101 static int geneve_change_mtu(struct net_device *dev, int new_mtu)
1102 {
1103         if (new_mtu > dev->max_mtu)
1104                 new_mtu = dev->max_mtu;
1105         else if (new_mtu < dev->min_mtu)
1106                 new_mtu = dev->min_mtu;
1107
1108         dev->mtu = new_mtu;
1109         return 0;
1110 }
1111
1112 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
1113 {
1114         struct ip_tunnel_info *info = skb_tunnel_info(skb);
1115         struct geneve_dev *geneve = netdev_priv(dev);
1116         __be16 sport;
1117
1118         if (ip_tunnel_info_af(info) == AF_INET) {
1119                 struct rtable *rt;
1120                 struct flowi4 fl4;
1121
1122                 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
1123                 sport = udp_flow_src_port(geneve->net, skb,
1124                                           1, USHRT_MAX, true);
1125
1126                 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info,
1127                                       geneve->cfg.info.key.tp_dst, sport, NULL);
1128                 if (IS_ERR(rt))
1129                         return PTR_ERR(rt);
1130
1131                 ip_rt_put(rt);
1132                 info->key.u.ipv4.src = fl4.saddr;
1133 #if IS_ENABLED(CONFIG_IPV6)
1134         } else if (ip_tunnel_info_af(info) == AF_INET6) {
1135                 struct dst_entry *dst;
1136                 struct flowi6 fl6;
1137
1138                 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
1139                 sport = udp_flow_src_port(geneve->net, skb,
1140                                           1, USHRT_MAX, true);
1141
1142                 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info,
1143                                         geneve->cfg.info.key.tp_dst, sport);
1144                 if (IS_ERR(dst))
1145                         return PTR_ERR(dst);
1146
1147                 dst_release(dst);
1148                 info->key.u.ipv6.src = fl6.saddr;
1149 #endif
1150         } else {
1151                 return -EINVAL;
1152         }
1153
1154         info->key.tp_src = sport;
1155         info->key.tp_dst = geneve->cfg.info.key.tp_dst;
1156         return 0;
1157 }
1158
1159 static const struct net_device_ops geneve_netdev_ops = {
1160         .ndo_init               = geneve_init,
1161         .ndo_uninit             = geneve_uninit,
1162         .ndo_open               = geneve_open,
1163         .ndo_stop               = geneve_stop,
1164         .ndo_start_xmit         = geneve_xmit,
1165         .ndo_get_stats64        = ip_tunnel_get_stats64,
1166         .ndo_change_mtu         = geneve_change_mtu,
1167         .ndo_validate_addr      = eth_validate_addr,
1168         .ndo_set_mac_address    = eth_mac_addr,
1169         .ndo_fill_metadata_dst  = geneve_fill_metadata_dst,
1170 };
1171
1172 static void geneve_get_drvinfo(struct net_device *dev,
1173                                struct ethtool_drvinfo *drvinfo)
1174 {
1175         strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
1176         strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
1177 }
1178
1179 static const struct ethtool_ops geneve_ethtool_ops = {
1180         .get_drvinfo    = geneve_get_drvinfo,
1181         .get_link       = ethtool_op_get_link,
1182 };
1183
1184 /* Info for udev, that this is a virtual tunnel endpoint */
1185 static struct device_type geneve_type = {
1186         .name = "geneve",
1187 };
1188
1189 /* Calls the ndo_udp_tunnel_add of the caller in order to
1190  * supply the listening GENEVE udp ports. Callers are expected
1191  * to implement the ndo_udp_tunnel_add.
1192  */
1193 static void geneve_offload_rx_ports(struct net_device *dev, bool push)
1194 {
1195         struct net *net = dev_net(dev);
1196         struct geneve_net *gn = net_generic(net, geneve_net_id);
1197         struct geneve_sock *gs;
1198
1199         rcu_read_lock();
1200         list_for_each_entry_rcu(gs, &gn->sock_list, list) {
1201                 if (push) {
1202                         udp_tunnel_push_rx_port(dev, gs->sock,
1203                                                 UDP_TUNNEL_TYPE_GENEVE);
1204                 } else {
1205                         udp_tunnel_drop_rx_port(dev, gs->sock,
1206                                                 UDP_TUNNEL_TYPE_GENEVE);
1207                 }
1208         }
1209         rcu_read_unlock();
1210 }
1211
1212 /* Initialize the device structure. */
1213 static void geneve_setup(struct net_device *dev)
1214 {
1215         ether_setup(dev);
1216
1217         dev->netdev_ops = &geneve_netdev_ops;
1218         dev->ethtool_ops = &geneve_ethtool_ops;
1219         dev->needs_free_netdev = true;
1220
1221         SET_NETDEV_DEVTYPE(dev, &geneve_type);
1222
1223         dev->features    |= NETIF_F_LLTX;
1224         dev->features    |= NETIF_F_SG | NETIF_F_HW_CSUM;
1225         dev->features    |= NETIF_F_RXCSUM;
1226         dev->features    |= NETIF_F_GSO_SOFTWARE;
1227
1228         dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
1229         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1230
1231         /* MTU range: 68 - (something less than 65535) */
1232         dev->min_mtu = ETH_MIN_MTU;
1233         /* The max_mtu calculation does not take account of GENEVE
1234          * options, to avoid excluding potentially valid
1235          * configurations. This will be further reduced by IPvX hdr size.
1236          */
1237         dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len;
1238
1239         netif_keep_dst(dev);
1240         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1241         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
1242         eth_hw_addr_random(dev);
1243 }
1244
1245 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
1246         [IFLA_GENEVE_ID]                = { .type = NLA_U32 },
1247         [IFLA_GENEVE_REMOTE]            = { .len = sizeof_field(struct iphdr, daddr) },
1248         [IFLA_GENEVE_REMOTE6]           = { .len = sizeof(struct in6_addr) },
1249         [IFLA_GENEVE_TTL]               = { .type = NLA_U8 },
1250         [IFLA_GENEVE_TOS]               = { .type = NLA_U8 },
1251         [IFLA_GENEVE_LABEL]             = { .type = NLA_U32 },
1252         [IFLA_GENEVE_PORT]              = { .type = NLA_U16 },
1253         [IFLA_GENEVE_COLLECT_METADATA]  = { .type = NLA_FLAG },
1254         [IFLA_GENEVE_UDP_CSUM]          = { .type = NLA_U8 },
1255         [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
1256         [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
1257         [IFLA_GENEVE_TTL_INHERIT]       = { .type = NLA_U8 },
1258         [IFLA_GENEVE_DF]                = { .type = NLA_U8 },
1259 };
1260
1261 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[],
1262                            struct netlink_ext_ack *extack)
1263 {
1264         if (tb[IFLA_ADDRESS]) {
1265                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
1266                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1267                                             "Provided link layer address is not Ethernet");
1268                         return -EINVAL;
1269                 }
1270
1271                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
1272                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1273                                             "Provided Ethernet address is not unicast");
1274                         return -EADDRNOTAVAIL;
1275                 }
1276         }
1277
1278         if (!data) {
1279                 NL_SET_ERR_MSG(extack,
1280                                "Not enough attributes provided to perform the operation");
1281                 return -EINVAL;
1282         }
1283
1284         if (data[IFLA_GENEVE_ID]) {
1285                 __u32 vni =  nla_get_u32(data[IFLA_GENEVE_ID]);
1286
1287                 if (vni >= GENEVE_N_VID) {
1288                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID],
1289                                             "Geneve ID must be lower than 16777216");
1290                         return -ERANGE;
1291                 }
1292         }
1293
1294         if (data[IFLA_GENEVE_DF]) {
1295                 enum ifla_geneve_df df = nla_get_u8(data[IFLA_GENEVE_DF]);
1296
1297                 if (df < 0 || df > GENEVE_DF_MAX) {
1298                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_DF],
1299                                             "Invalid DF attribute");
1300                         return -EINVAL;
1301                 }
1302         }
1303
1304         return 0;
1305 }
1306
1307 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
1308                                           const struct ip_tunnel_info *info,
1309                                           bool *tun_on_same_port,
1310                                           bool *tun_collect_md)
1311 {
1312         struct geneve_dev *geneve, *t = NULL;
1313
1314         *tun_on_same_port = false;
1315         *tun_collect_md = false;
1316         list_for_each_entry(geneve, &gn->geneve_list, next) {
1317                 if (info->key.tp_dst == geneve->cfg.info.key.tp_dst) {
1318                         *tun_collect_md = geneve->cfg.collect_md;
1319                         *tun_on_same_port = true;
1320                 }
1321                 if (info->key.tun_id == geneve->cfg.info.key.tun_id &&
1322                     info->key.tp_dst == geneve->cfg.info.key.tp_dst &&
1323                     !memcmp(&info->key.u, &geneve->cfg.info.key.u, sizeof(info->key.u)))
1324                         t = geneve;
1325         }
1326         return t;
1327 }
1328
1329 static bool is_tnl_info_zero(const struct ip_tunnel_info *info)
1330 {
1331         return !(info->key.tun_id || info->key.tun_flags || info->key.tos ||
1332                  info->key.ttl || info->key.label || info->key.tp_src ||
1333                  memchr_inv(&info->key.u, 0, sizeof(info->key.u)));
1334 }
1335
1336 static bool geneve_dst_addr_equal(struct ip_tunnel_info *a,
1337                                   struct ip_tunnel_info *b)
1338 {
1339         if (ip_tunnel_info_af(a) == AF_INET)
1340                 return a->key.u.ipv4.dst == b->key.u.ipv4.dst;
1341         else
1342                 return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst);
1343 }
1344
1345 static int geneve_configure(struct net *net, struct net_device *dev,
1346                             struct netlink_ext_ack *extack,
1347                             const struct geneve_config *cfg)
1348 {
1349         struct geneve_net *gn = net_generic(net, geneve_net_id);
1350         struct geneve_dev *t, *geneve = netdev_priv(dev);
1351         const struct ip_tunnel_info *info = &cfg->info;
1352         bool tun_collect_md, tun_on_same_port;
1353         int err, encap_len;
1354
1355         if (cfg->collect_md && !is_tnl_info_zero(info)) {
1356                 NL_SET_ERR_MSG(extack,
1357                                "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified");
1358                 return -EINVAL;
1359         }
1360
1361         geneve->net = net;
1362         geneve->dev = dev;
1363
1364         t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md);
1365         if (t)
1366                 return -EBUSY;
1367
1368         /* make enough headroom for basic scenario */
1369         encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
1370         if (!cfg->collect_md && ip_tunnel_info_af(info) == AF_INET) {
1371                 encap_len += sizeof(struct iphdr);
1372                 dev->max_mtu -= sizeof(struct iphdr);
1373         } else {
1374                 encap_len += sizeof(struct ipv6hdr);
1375                 dev->max_mtu -= sizeof(struct ipv6hdr);
1376         }
1377         dev->needed_headroom = encap_len + ETH_HLEN;
1378
1379         if (cfg->collect_md) {
1380                 if (tun_on_same_port) {
1381                         NL_SET_ERR_MSG(extack,
1382                                        "There can be only one externally controlled device on a destination port");
1383                         return -EPERM;
1384                 }
1385         } else {
1386                 if (tun_collect_md) {
1387                         NL_SET_ERR_MSG(extack,
1388                                        "There already exists an externally controlled device on this destination port");
1389                         return -EPERM;
1390                 }
1391         }
1392
1393         dst_cache_reset(&geneve->cfg.info.dst_cache);
1394         memcpy(&geneve->cfg, cfg, sizeof(*cfg));
1395
1396         err = register_netdevice(dev);
1397         if (err)
1398                 return err;
1399
1400         list_add(&geneve->next, &gn->geneve_list);
1401         return 0;
1402 }
1403
1404 static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port)
1405 {
1406         memset(info, 0, sizeof(*info));
1407         info->key.tp_dst = htons(dst_port);
1408 }
1409
1410 static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[],
1411                           struct netlink_ext_ack *extack,
1412                           struct geneve_config *cfg, bool changelink)
1413 {
1414         struct ip_tunnel_info *info = &cfg->info;
1415         int attrtype;
1416
1417         if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) {
1418                 NL_SET_ERR_MSG(extack,
1419                                "Cannot specify both IPv4 and IPv6 Remote addresses");
1420                 return -EINVAL;
1421         }
1422
1423         if (data[IFLA_GENEVE_REMOTE]) {
1424                 if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) {
1425                         attrtype = IFLA_GENEVE_REMOTE;
1426                         goto change_notsup;
1427                 }
1428
1429                 info->key.u.ipv4.dst =
1430                         nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
1431
1432                 if (ipv4_is_multicast(info->key.u.ipv4.dst)) {
1433                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE],
1434                                             "Remote IPv4 address cannot be Multicast");
1435                         return -EINVAL;
1436                 }
1437         }
1438
1439         if (data[IFLA_GENEVE_REMOTE6]) {
1440 #if IS_ENABLED(CONFIG_IPV6)
1441                 if (changelink && (ip_tunnel_info_af(info) == AF_INET)) {
1442                         attrtype = IFLA_GENEVE_REMOTE6;
1443                         goto change_notsup;
1444                 }
1445
1446                 info->mode = IP_TUNNEL_INFO_IPV6;
1447                 info->key.u.ipv6.dst =
1448                         nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
1449
1450                 if (ipv6_addr_type(&info->key.u.ipv6.dst) &
1451                     IPV6_ADDR_LINKLOCAL) {
1452                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1453                                             "Remote IPv6 address cannot be link-local");
1454                         return -EINVAL;
1455                 }
1456                 if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) {
1457                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1458                                             "Remote IPv6 address cannot be Multicast");
1459                         return -EINVAL;
1460                 }
1461                 info->key.tun_flags |= TUNNEL_CSUM;
1462                 cfg->use_udp6_rx_checksums = true;
1463 #else
1464                 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1465                                     "IPv6 support not enabled in the kernel");
1466                 return -EPFNOSUPPORT;
1467 #endif
1468         }
1469
1470         if (data[IFLA_GENEVE_ID]) {
1471                 __u32 vni;
1472                 __u8 tvni[3];
1473                 __be64 tunid;
1474
1475                 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1476                 tvni[0] = (vni & 0x00ff0000) >> 16;
1477                 tvni[1] = (vni & 0x0000ff00) >> 8;
1478                 tvni[2] =  vni & 0x000000ff;
1479
1480                 tunid = vni_to_tunnel_id(tvni);
1481                 if (changelink && (tunid != info->key.tun_id)) {
1482                         attrtype = IFLA_GENEVE_ID;
1483                         goto change_notsup;
1484                 }
1485                 info->key.tun_id = tunid;
1486         }
1487
1488         if (data[IFLA_GENEVE_TTL_INHERIT]) {
1489                 if (nla_get_u8(data[IFLA_GENEVE_TTL_INHERIT]))
1490                         cfg->ttl_inherit = true;
1491                 else
1492                         cfg->ttl_inherit = false;
1493         } else if (data[IFLA_GENEVE_TTL]) {
1494                 info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
1495                 cfg->ttl_inherit = false;
1496         }
1497
1498         if (data[IFLA_GENEVE_TOS])
1499                 info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
1500
1501         if (data[IFLA_GENEVE_DF])
1502                 cfg->df = nla_get_u8(data[IFLA_GENEVE_DF]);
1503
1504         if (data[IFLA_GENEVE_LABEL]) {
1505                 info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) &
1506                                   IPV6_FLOWLABEL_MASK;
1507                 if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) {
1508                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL],
1509                                             "Label attribute only applies for IPv6 Geneve devices");
1510                         return -EINVAL;
1511                 }
1512         }
1513
1514         if (data[IFLA_GENEVE_PORT]) {
1515                 if (changelink) {
1516                         attrtype = IFLA_GENEVE_PORT;
1517                         goto change_notsup;
1518                 }
1519                 info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]);
1520         }
1521
1522         if (data[IFLA_GENEVE_COLLECT_METADATA]) {
1523                 if (changelink) {
1524                         attrtype = IFLA_GENEVE_COLLECT_METADATA;
1525                         goto change_notsup;
1526                 }
1527                 cfg->collect_md = true;
1528         }
1529
1530         if (data[IFLA_GENEVE_UDP_CSUM]) {
1531                 if (changelink) {
1532                         attrtype = IFLA_GENEVE_UDP_CSUM;
1533                         goto change_notsup;
1534                 }
1535                 if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
1536                         info->key.tun_flags |= TUNNEL_CSUM;
1537         }
1538
1539         if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) {
1540 #if IS_ENABLED(CONFIG_IPV6)
1541                 if (changelink) {
1542                         attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX;
1543                         goto change_notsup;
1544                 }
1545                 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
1546                         info->key.tun_flags &= ~TUNNEL_CSUM;
1547 #else
1548                 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX],
1549                                     "IPv6 support not enabled in the kernel");
1550                 return -EPFNOSUPPORT;
1551 #endif
1552         }
1553
1554         if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) {
1555 #if IS_ENABLED(CONFIG_IPV6)
1556                 if (changelink) {
1557                         attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX;
1558                         goto change_notsup;
1559                 }
1560                 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
1561                         cfg->use_udp6_rx_checksums = false;
1562 #else
1563                 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX],
1564                                     "IPv6 support not enabled in the kernel");
1565                 return -EPFNOSUPPORT;
1566 #endif
1567         }
1568
1569         return 0;
1570 change_notsup:
1571         NL_SET_ERR_MSG_ATTR(extack, data[attrtype],
1572                             "Changing VNI, Port, endpoint IP address family, external, and UDP checksum attributes are not supported");
1573         return -EOPNOTSUPP;
1574 }
1575
1576 static void geneve_link_config(struct net_device *dev,
1577                                struct ip_tunnel_info *info, struct nlattr *tb[])
1578 {
1579         struct geneve_dev *geneve = netdev_priv(dev);
1580         int ldev_mtu = 0;
1581
1582         if (tb[IFLA_MTU]) {
1583                 geneve_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1584                 return;
1585         }
1586
1587         switch (ip_tunnel_info_af(info)) {
1588         case AF_INET: {
1589                 struct flowi4 fl4 = { .daddr = info->key.u.ipv4.dst };
1590                 struct rtable *rt = ip_route_output_key(geneve->net, &fl4);
1591
1592                 if (!IS_ERR(rt) && rt->dst.dev) {
1593                         ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV4_HLEN;
1594                         ip_rt_put(rt);
1595                 }
1596                 break;
1597         }
1598 #if IS_ENABLED(CONFIG_IPV6)
1599         case AF_INET6: {
1600                 struct rt6_info *rt;
1601
1602                 if (!__in6_dev_get(dev))
1603                         break;
1604
1605                 rt = rt6_lookup(geneve->net, &info->key.u.ipv6.dst, NULL, 0,
1606                                 NULL, 0);
1607
1608                 if (rt && rt->dst.dev)
1609                         ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV6_HLEN;
1610                 ip6_rt_put(rt);
1611                 break;
1612         }
1613 #endif
1614         }
1615
1616         if (ldev_mtu <= 0)
1617                 return;
1618
1619         geneve_change_mtu(dev, ldev_mtu - info->options_len);
1620 }
1621
1622 static int geneve_newlink(struct net *net, struct net_device *dev,
1623                           struct nlattr *tb[], struct nlattr *data[],
1624                           struct netlink_ext_ack *extack)
1625 {
1626         struct geneve_config cfg = {
1627                 .df = GENEVE_DF_UNSET,
1628                 .use_udp6_rx_checksums = false,
1629                 .ttl_inherit = false,
1630                 .collect_md = false,
1631         };
1632         int err;
1633
1634         init_tnl_info(&cfg.info, GENEVE_UDP_PORT);
1635         err = geneve_nl2info(tb, data, extack, &cfg, false);
1636         if (err)
1637                 return err;
1638
1639         err = geneve_configure(net, dev, extack, &cfg);
1640         if (err)
1641                 return err;
1642
1643         geneve_link_config(dev, &cfg.info, tb);
1644
1645         return 0;
1646 }
1647
1648 /* Quiesces the geneve device data path for both TX and RX.
1649  *
1650  * On transmit geneve checks for non-NULL geneve_sock before it proceeds.
1651  * So, if we set that socket to NULL under RCU and wait for synchronize_net()
1652  * to complete for the existing set of in-flight packets to be transmitted,
1653  * then we would have quiesced the transmit data path. All the future packets
1654  * will get dropped until we unquiesce the data path.
1655  *
1656  * On receive geneve dereference the geneve_sock stashed in the socket. So,
1657  * if we set that to NULL under RCU and wait for synchronize_net() to
1658  * complete, then we would have quiesced the receive data path.
1659  */
1660 static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4,
1661                            struct geneve_sock **gs6)
1662 {
1663         *gs4 = rtnl_dereference(geneve->sock4);
1664         rcu_assign_pointer(geneve->sock4, NULL);
1665         if (*gs4)
1666                 rcu_assign_sk_user_data((*gs4)->sock->sk, NULL);
1667 #if IS_ENABLED(CONFIG_IPV6)
1668         *gs6 = rtnl_dereference(geneve->sock6);
1669         rcu_assign_pointer(geneve->sock6, NULL);
1670         if (*gs6)
1671                 rcu_assign_sk_user_data((*gs6)->sock->sk, NULL);
1672 #else
1673         *gs6 = NULL;
1674 #endif
1675         synchronize_net();
1676 }
1677
1678 /* Resumes the geneve device data path for both TX and RX. */
1679 static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4,
1680                              struct geneve_sock __maybe_unused *gs6)
1681 {
1682         rcu_assign_pointer(geneve->sock4, gs4);
1683         if (gs4)
1684                 rcu_assign_sk_user_data(gs4->sock->sk, gs4);
1685 #if IS_ENABLED(CONFIG_IPV6)
1686         rcu_assign_pointer(geneve->sock6, gs6);
1687         if (gs6)
1688                 rcu_assign_sk_user_data(gs6->sock->sk, gs6);
1689 #endif
1690         synchronize_net();
1691 }
1692
1693 static int geneve_changelink(struct net_device *dev, struct nlattr *tb[],
1694                              struct nlattr *data[],
1695                              struct netlink_ext_ack *extack)
1696 {
1697         struct geneve_dev *geneve = netdev_priv(dev);
1698         struct geneve_sock *gs4, *gs6;
1699         struct geneve_config cfg;
1700         int err;
1701
1702         /* If the geneve device is configured for metadata (or externally
1703          * controlled, for example, OVS), then nothing can be changed.
1704          */
1705         if (geneve->cfg.collect_md)
1706                 return -EOPNOTSUPP;
1707
1708         /* Start with the existing info. */
1709         memcpy(&cfg, &geneve->cfg, sizeof(cfg));
1710         err = geneve_nl2info(tb, data, extack, &cfg, true);
1711         if (err)
1712                 return err;
1713
1714         if (!geneve_dst_addr_equal(&geneve->cfg.info, &cfg.info)) {
1715                 dst_cache_reset(&cfg.info.dst_cache);
1716                 geneve_link_config(dev, &cfg.info, tb);
1717         }
1718
1719         geneve_quiesce(geneve, &gs4, &gs6);
1720         memcpy(&geneve->cfg, &cfg, sizeof(cfg));
1721         geneve_unquiesce(geneve, gs4, gs6);
1722
1723         return 0;
1724 }
1725
1726 static void geneve_dellink(struct net_device *dev, struct list_head *head)
1727 {
1728         struct geneve_dev *geneve = netdev_priv(dev);
1729
1730         list_del(&geneve->next);
1731         unregister_netdevice_queue(dev, head);
1732 }
1733
1734 static size_t geneve_get_size(const struct net_device *dev)
1735 {
1736         return nla_total_size(sizeof(__u32)) +  /* IFLA_GENEVE_ID */
1737                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */
1738                 nla_total_size(sizeof(__u8)) +  /* IFLA_GENEVE_TTL */
1739                 nla_total_size(sizeof(__u8)) +  /* IFLA_GENEVE_TOS */
1740                 nla_total_size(sizeof(__u8)) +  /* IFLA_GENEVE_DF */
1741                 nla_total_size(sizeof(__be32)) +  /* IFLA_GENEVE_LABEL */
1742                 nla_total_size(sizeof(__be16)) +  /* IFLA_GENEVE_PORT */
1743                 nla_total_size(0) +      /* IFLA_GENEVE_COLLECT_METADATA */
1744                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */
1745                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */
1746                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */
1747                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL_INHERIT */
1748                 0;
1749 }
1750
1751 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
1752 {
1753         struct geneve_dev *geneve = netdev_priv(dev);
1754         struct ip_tunnel_info *info = &geneve->cfg.info;
1755         bool ttl_inherit = geneve->cfg.ttl_inherit;
1756         bool metadata = geneve->cfg.collect_md;
1757         __u8 tmp_vni[3];
1758         __u32 vni;
1759
1760         tunnel_id_to_vni(info->key.tun_id, tmp_vni);
1761         vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2];
1762         if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
1763                 goto nla_put_failure;
1764
1765         if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
1766                 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
1767                                     info->key.u.ipv4.dst))
1768                         goto nla_put_failure;
1769                 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM,
1770                                !!(info->key.tun_flags & TUNNEL_CSUM)))
1771                         goto nla_put_failure;
1772
1773 #if IS_ENABLED(CONFIG_IPV6)
1774         } else if (!metadata) {
1775                 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6,
1776                                      &info->key.u.ipv6.dst))
1777                         goto nla_put_failure;
1778                 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
1779                                !(info->key.tun_flags & TUNNEL_CSUM)))
1780                         goto nla_put_failure;
1781 #endif
1782         }
1783
1784         if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) ||
1785             nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) ||
1786             nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label))
1787                 goto nla_put_failure;
1788
1789         if (nla_put_u8(skb, IFLA_GENEVE_DF, geneve->cfg.df))
1790                 goto nla_put_failure;
1791
1792         if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst))
1793                 goto nla_put_failure;
1794
1795         if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
1796                 goto nla_put_failure;
1797
1798 #if IS_ENABLED(CONFIG_IPV6)
1799         if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
1800                        !geneve->cfg.use_udp6_rx_checksums))
1801                 goto nla_put_failure;
1802 #endif
1803
1804         if (nla_put_u8(skb, IFLA_GENEVE_TTL_INHERIT, ttl_inherit))
1805                 goto nla_put_failure;
1806
1807         return 0;
1808
1809 nla_put_failure:
1810         return -EMSGSIZE;
1811 }
1812
1813 static struct rtnl_link_ops geneve_link_ops __read_mostly = {
1814         .kind           = "geneve",
1815         .maxtype        = IFLA_GENEVE_MAX,
1816         .policy         = geneve_policy,
1817         .priv_size      = sizeof(struct geneve_dev),
1818         .setup          = geneve_setup,
1819         .validate       = geneve_validate,
1820         .newlink        = geneve_newlink,
1821         .changelink     = geneve_changelink,
1822         .dellink        = geneve_dellink,
1823         .get_size       = geneve_get_size,
1824         .fill_info      = geneve_fill_info,
1825 };
1826
1827 struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
1828                                         u8 name_assign_type, u16 dst_port)
1829 {
1830         struct nlattr *tb[IFLA_MAX + 1];
1831         struct net_device *dev;
1832         LIST_HEAD(list_kill);
1833         int err;
1834         struct geneve_config cfg = {
1835                 .df = GENEVE_DF_UNSET,
1836                 .use_udp6_rx_checksums = true,
1837                 .ttl_inherit = false,
1838                 .collect_md = true,
1839         };
1840
1841         memset(tb, 0, sizeof(tb));
1842         dev = rtnl_create_link(net, name, name_assign_type,
1843                                &geneve_link_ops, tb, NULL);
1844         if (IS_ERR(dev))
1845                 return dev;
1846
1847         init_tnl_info(&cfg.info, dst_port);
1848         err = geneve_configure(net, dev, NULL, &cfg);
1849         if (err) {
1850                 free_netdev(dev);
1851                 return ERR_PTR(err);
1852         }
1853
1854         /* openvswitch users expect packet sizes to be unrestricted,
1855          * so set the largest MTU we can.
1856          */
1857         err = geneve_change_mtu(dev, IP_MAX_MTU);
1858         if (err)
1859                 goto err;
1860
1861         err = rtnl_configure_link(dev, NULL);
1862         if (err < 0)
1863                 goto err;
1864
1865         return dev;
1866 err:
1867         geneve_dellink(dev, &list_kill);
1868         unregister_netdevice_many(&list_kill);
1869         return ERR_PTR(err);
1870 }
1871 EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
1872
1873 static int geneve_netdevice_event(struct notifier_block *unused,
1874                                   unsigned long event, void *ptr)
1875 {
1876         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1877
1878         if (event == NETDEV_UDP_TUNNEL_PUSH_INFO ||
1879             event == NETDEV_UDP_TUNNEL_DROP_INFO) {
1880                 geneve_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO);
1881         } else if (event == NETDEV_UNREGISTER) {
1882                 if (!dev->udp_tunnel_nic_info)
1883                         geneve_offload_rx_ports(dev, false);
1884         } else if (event == NETDEV_REGISTER) {
1885                 if (!dev->udp_tunnel_nic_info)
1886                         geneve_offload_rx_ports(dev, true);
1887         }
1888
1889         return NOTIFY_DONE;
1890 }
1891
1892 static struct notifier_block geneve_notifier_block __read_mostly = {
1893         .notifier_call = geneve_netdevice_event,
1894 };
1895
1896 static __net_init int geneve_init_net(struct net *net)
1897 {
1898         struct geneve_net *gn = net_generic(net, geneve_net_id);
1899
1900         INIT_LIST_HEAD(&gn->geneve_list);
1901         INIT_LIST_HEAD(&gn->sock_list);
1902         return 0;
1903 }
1904
1905 static void geneve_destroy_tunnels(struct net *net, struct list_head *head)
1906 {
1907         struct geneve_net *gn = net_generic(net, geneve_net_id);
1908         struct geneve_dev *geneve, *next;
1909         struct net_device *dev, *aux;
1910
1911         /* gather any geneve devices that were moved into this ns */
1912         for_each_netdev_safe(net, dev, aux)
1913                 if (dev->rtnl_link_ops == &geneve_link_ops)
1914                         unregister_netdevice_queue(dev, head);
1915
1916         /* now gather any other geneve devices that were created in this ns */
1917         list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
1918                 /* If geneve->dev is in the same netns, it was already added
1919                  * to the list by the previous loop.
1920                  */
1921                 if (!net_eq(dev_net(geneve->dev), net))
1922                         unregister_netdevice_queue(geneve->dev, head);
1923         }
1924 }
1925
1926 static void __net_exit geneve_exit_batch_net(struct list_head *net_list)
1927 {
1928         struct net *net;
1929         LIST_HEAD(list);
1930
1931         rtnl_lock();
1932         list_for_each_entry(net, net_list, exit_list)
1933                 geneve_destroy_tunnels(net, &list);
1934
1935         /* unregister the devices gathered above */
1936         unregister_netdevice_many(&list);
1937         rtnl_unlock();
1938
1939         list_for_each_entry(net, net_list, exit_list) {
1940                 const struct geneve_net *gn = net_generic(net, geneve_net_id);
1941
1942                 WARN_ON_ONCE(!list_empty(&gn->sock_list));
1943         }
1944 }
1945
1946 static struct pernet_operations geneve_net_ops = {
1947         .init = geneve_init_net,
1948         .exit_batch = geneve_exit_batch_net,
1949         .id   = &geneve_net_id,
1950         .size = sizeof(struct geneve_net),
1951 };
1952
1953 static int __init geneve_init_module(void)
1954 {
1955         int rc;
1956
1957         rc = register_pernet_subsys(&geneve_net_ops);
1958         if (rc)
1959                 goto out1;
1960
1961         rc = register_netdevice_notifier(&geneve_notifier_block);
1962         if (rc)
1963                 goto out2;
1964
1965         rc = rtnl_link_register(&geneve_link_ops);
1966         if (rc)
1967                 goto out3;
1968
1969         return 0;
1970 out3:
1971         unregister_netdevice_notifier(&geneve_notifier_block);
1972 out2:
1973         unregister_pernet_subsys(&geneve_net_ops);
1974 out1:
1975         return rc;
1976 }
1977 late_initcall(geneve_init_module);
1978
1979 static void __exit geneve_cleanup_module(void)
1980 {
1981         rtnl_link_unregister(&geneve_link_ops);
1982         unregister_netdevice_notifier(&geneve_notifier_block);
1983         unregister_pernet_subsys(&geneve_net_ops);
1984 }
1985 module_exit(geneve_cleanup_module);
1986
1987 MODULE_LICENSE("GPL");
1988 MODULE_VERSION(GENEVE_NETDEV_VER);
1989 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
1990 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
1991 MODULE_ALIAS_RTNL_LINK("geneve");