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 {
 777         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
 778         struct geneve_dev *geneve = netdev_priv(dev);
 779         struct dst_cache *dst_cache;
 780         struct rtable *rt = NULL;
 781         __u8 tos;
 782
 783         if (!gs4)
 784                 return ERR_PTR(-EIO);
 785
 786         memset(fl4, 0, sizeof(*fl4));
 787         fl4->flowi4_mark = skb->mark;
 788         fl4->flowi4_proto = IPPROTO_UDP;
 789         fl4->daddr = info->key.u.ipv4.dst;
 790         fl4->saddr = info->key.u.ipv4.src;
 791         fl4->fl4_dport = dport;
 792         fl4->fl4_sport = sport;
 793
 794         tos = info->key.tos;
 795         if ((tos == 1) && !geneve->cfg.collect_md) {
 796                 tos = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
 797                 use_cache = false;
 798         }
 799         fl4->flowi4_tos = RT_TOS(tos);
 800
 801         dst_cache = (struct dst_cache *)&info->dst_cache;
 802         if (use_cache) {
 803                 rt = dst_cache_get_ip4(dst_cache, &fl4->saddr);
 804                 if (rt)
 805                         return rt;
 806         }
 807         rt = ip_route_output_key(geneve->net, fl4);
 808         if (IS_ERR(rt)) {
 809                 netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr);
 810                 return ERR_PTR(-ENETUNREACH);
 811         }
 812         if (rt->dst.dev == dev) { /* is this necessary? */
 813                 netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr);
 814                 ip_rt_put(rt);
 815                 return ERR_PTR(-ELOOP);
 816         }
 817         if (use_cache)
 818                 dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr);
 819         return rt;
 820 }
 821
 822 #if IS_ENABLED(CONFIG_IPV6)
 823 static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb,
 824                                            struct net_device *dev,
 825                                            struct geneve_sock *gs6,
 826                                            struct flowi6 *fl6,
 827                                            const struct ip_tunnel_info *info,
 828                                            __be16 dport, __be16 sport)
 829 {
 830         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
 831         struct geneve_dev *geneve = netdev_priv(dev);
 832         struct dst_entry *dst = NULL;
 833         struct dst_cache *dst_cache;
 834         __u8 prio;
 835
 836         if (!gs6)
 837                 return ERR_PTR(-EIO);
 838
 839         memset(fl6, 0, sizeof(*fl6));
 840         fl6->flowi6_mark = skb->mark;
 841         fl6->flowi6_proto = IPPROTO_UDP;
 842         fl6->daddr = info->key.u.ipv6.dst;
 843         fl6->saddr = info->key.u.ipv6.src;
 844         fl6->fl6_dport = dport;
 845         fl6->fl6_sport = sport;
 846
 847         prio = info->key.tos;
 848         if ((prio == 1) && !geneve->cfg.collect_md) {
 849                 prio = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
 850                 use_cache = false;
 851         }
 852
 853         fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio),
 854                                            info->key.label);
 855         dst_cache = (struct dst_cache *)&info->dst_cache;
 856         if (use_cache) {
 857                 dst = dst_cache_get_ip6(dst_cache, &fl6->saddr);
 858                 if (dst)
 859                         return dst;
 860         }
 861         dst = ipv6_stub->ipv6_dst_lookup_flow(geneve->net, gs6->sock->sk, fl6,
 862                                               NULL);
 863         if (IS_ERR(dst)) {
 864                 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr);
 865                 return ERR_PTR(-ENETUNREACH);
 866         }
 867         if (dst->dev == dev) { /* is this necessary? */
 868                 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr);
 869                 dst_release(dst);
 870                 return ERR_PTR(-ELOOP);
 871         }
 872
 873         if (use_cache)
 874                 dst_cache_set_ip6(dst_cache, dst, &fl6->saddr);
 875         return dst;
 876 }
 877 #endif
 878
 879 static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
 880                            struct geneve_dev *geneve,
 881                            const struct ip_tunnel_info *info)
 882 {
 883         bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
 884         struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
 885         const struct ip_tunnel_key *key = &info->key;
 886         struct rtable *rt;
 887         struct flowi4 fl4;
 888         __u8 tos, ttl;
 889         __be16 df = 0;
 890         __be16 sport;
 891         int err;
 892
 893         sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
 894         rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info,
 895                               geneve->cfg.info.key.tp_dst, sport);
 896         if (IS_ERR(rt))
 897                 return PTR_ERR(rt);
 898
 899         err = skb_tunnel_check_pmtu(skb, &rt->dst,
 900                                     GENEVE_IPV4_HLEN + info->options_len,
 901                                     netif_is_any_bridge_port(dev));
 902         if (err < 0) {
 903                 dst_release(&rt->dst);
 904                 return err;
 905         } else if (err) {
 906                 struct ip_tunnel_info *info;
 907
 908                 info = skb_tunnel_info(skb);
 909                 if (info) {
 910                         info->key.u.ipv4.dst = fl4.saddr;
 911                         info->key.u.ipv4.src = fl4.daddr;
 912                 }
 913
 914                 if (!pskb_may_pull(skb, ETH_HLEN)) {
 915                         dst_release(&rt->dst);
 916                         return -EINVAL;
 917                 }
 918
 919                 skb->protocol = eth_type_trans(skb, geneve->dev);
 920                 netif_rx(skb);
 921                 dst_release(&rt->dst);
 922                 return -EMSGSIZE;
 923         }
 924
 925         if (geneve->cfg.collect_md) {
 926                 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
 927                 ttl = key->ttl;
 928
 929                 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
 930         } else {
 931                 tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, ip_hdr(skb), skb);
 932                 if (geneve->cfg.ttl_inherit)
 933                         ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb);
 934                 else
 935                         ttl = key->ttl;
 936                 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
 937
 938                 if (geneve->cfg.df == GENEVE_DF_SET) {
 939                         df = htons(IP_DF);
 940                 } else if (geneve->cfg.df == GENEVE_DF_INHERIT) {
 941                         struct ethhdr *eth = eth_hdr(skb);
 942
 943                         if (ntohs(eth->h_proto) == ETH_P_IPV6) {
 944                                 df = htons(IP_DF);
 945                         } else if (ntohs(eth->h_proto) == ETH_P_IP) {
 946                                 struct iphdr *iph = ip_hdr(skb);
 947
 948                                 if (iph->frag_off & htons(IP_DF))
 949                                         df = htons(IP_DF);
 950                         }
 951                 }
 952         }
 953
 954         err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr));
 955         if (unlikely(err))
 956                 return err;
 957
 958         udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr,
 959                             tos, ttl, df, sport, geneve->cfg.info.key.tp_dst,
 960                             !net_eq(geneve->net, dev_net(geneve->dev)),
 961                             !(info->key.tun_flags & TUNNEL_CSUM));
 962         return 0;
 963 }
 964
 965 #if IS_ENABLED(CONFIG_IPV6)
 966 static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
 967                             struct geneve_dev *geneve,
 968                             const struct ip_tunnel_info *info)
 969 {
 970         bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
 971         struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
 972         const struct ip_tunnel_key *key = &info->key;
 973         struct dst_entry *dst = NULL;
 974         struct flowi6 fl6;
 975         __u8 prio, ttl;
 976         __be16 sport;
 977         int err;
 978
 979         sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
 980         dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info,
 981                                 geneve->cfg.info.key.tp_dst, sport);
 982         if (IS_ERR(dst))
 983                 return PTR_ERR(dst);
 984
 985         err = skb_tunnel_check_pmtu(skb, dst,
 986                                     GENEVE_IPV6_HLEN + info->options_len,
 987                                     netif_is_any_bridge_port(dev));
 988         if (err < 0) {
 989                 dst_release(dst);
 990                 return err;
 991         } else if (err) {
 992                 struct ip_tunnel_info *info = skb_tunnel_info(skb);
 993
 994                 if (info) {
 995                         info->key.u.ipv6.dst = fl6.saddr;
 996                         info->key.u.ipv6.src = fl6.daddr;
 997                 }
 998
 999                 if (!pskb_may_pull(skb, ETH_HLEN)) {
1000                         dst_release(dst);
1001                         return -EINVAL;
1002                 }
1003
1004                 skb->protocol = eth_type_trans(skb, geneve->dev);
1005                 netif_rx(skb);
1006                 dst_release(dst);
1007                 return -EMSGSIZE;
1008         }
1009
1010         if (geneve->cfg.collect_md) {
1011                 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
1012                 ttl = key->ttl;
1013         } else {
1014                 prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel),
1015                                            ip_hdr(skb), skb);
1016                 if (geneve->cfg.ttl_inherit)
1017                         ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb);
1018                 else
1019                         ttl = key->ttl;
1020                 ttl = ttl ? : ip6_dst_hoplimit(dst);
1021         }
1022         err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr));
1023         if (unlikely(err))
1024                 return err;
1025
1026         udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
1027                              &fl6.saddr, &fl6.daddr, prio, ttl,
1028                              info->key.label, sport, geneve->cfg.info.key.tp_dst,
1029                              !(info->key.tun_flags & TUNNEL_CSUM));
1030         return 0;
1031 }
1032 #endif
1033
1034 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
1035 {
1036         struct geneve_dev *geneve = netdev_priv(dev);
1037         struct ip_tunnel_info *info = NULL;
1038         int err;
1039
1040         if (geneve->cfg.collect_md) {
1041                 info = skb_tunnel_info(skb);
1042                 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
1043                         netdev_dbg(dev, "no tunnel metadata\n");
1044                         dev_kfree_skb(skb);
1045                         dev->stats.tx_dropped++;
1046                         return NETDEV_TX_OK;
1047                 }
1048         } else {
1049                 info = &geneve->cfg.info;
1050         }
1051
1052         rcu_read_lock();
1053 #if IS_ENABLED(CONFIG_IPV6)
1054         if (info->mode & IP_TUNNEL_INFO_IPV6)
1055                 err = geneve6_xmit_skb(skb, dev, geneve, info);
1056         else
1057 #endif
1058                 err = geneve_xmit_skb(skb, dev, geneve, info);
1059         rcu_read_unlock();
1060
1061         if (likely(!err))
1062                 return NETDEV_TX_OK;
1063
1064         if (err != -EMSGSIZE)
1065                 dev_kfree_skb(skb);
1066
1067         if (err == -ELOOP)
1068                 dev->stats.collisions++;
1069         else if (err == -ENETUNREACH)
1070                 dev->stats.tx_carrier_errors++;
1071
1072         dev->stats.tx_errors++;
1073         return NETDEV_TX_OK;
1074 }
1075
1076 static int geneve_change_mtu(struct net_device *dev, int new_mtu)
1077 {
1078         if (new_mtu > dev->max_mtu)
1079                 new_mtu = dev->max_mtu;
1080         else if (new_mtu < dev->min_mtu)
1081                 new_mtu = dev->min_mtu;
1082
1083         dev->mtu = new_mtu;
1084         return 0;
1085 }
1086
1087 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
1088 {
1089         struct ip_tunnel_info *info = skb_tunnel_info(skb);
1090         struct geneve_dev *geneve = netdev_priv(dev);
1091         __be16 sport;
1092
1093         if (ip_tunnel_info_af(info) == AF_INET) {
1094                 struct rtable *rt;
1095                 struct flowi4 fl4;
1096
1097                 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
1098                 sport = udp_flow_src_port(geneve->net, skb,
1099                                           1, USHRT_MAX, true);
1100
1101                 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info,
1102                                       geneve->cfg.info.key.tp_dst, sport);
1103                 if (IS_ERR(rt))
1104                         return PTR_ERR(rt);
1105
1106                 ip_rt_put(rt);
1107                 info->key.u.ipv4.src = fl4.saddr;
1108 #if IS_ENABLED(CONFIG_IPV6)
1109         } else if (ip_tunnel_info_af(info) == AF_INET6) {
1110                 struct dst_entry *dst;
1111                 struct flowi6 fl6;
1112
1113                 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
1114                 sport = udp_flow_src_port(geneve->net, skb,
1115                                           1, USHRT_MAX, true);
1116
1117                 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info,
1118                                         geneve->cfg.info.key.tp_dst, sport);
1119                 if (IS_ERR(dst))
1120                         return PTR_ERR(dst);
1121
1122                 dst_release(dst);
1123                 info->key.u.ipv6.src = fl6.saddr;
1124 #endif
1125         } else {
1126                 return -EINVAL;
1127         }
1128
1129         info->key.tp_src = sport;
1130         info->key.tp_dst = geneve->cfg.info.key.tp_dst;
1131         return 0;
1132 }
1133
1134 static const struct net_device_ops geneve_netdev_ops = {
1135         .ndo_init               = geneve_init,
1136         .ndo_uninit             = geneve_uninit,
1137         .ndo_open               = geneve_open,
1138         .ndo_stop               = geneve_stop,
1139         .ndo_start_xmit         = geneve_xmit,
1140         .ndo_get_stats64        = ip_tunnel_get_stats64,
1141         .ndo_change_mtu         = geneve_change_mtu,
1142         .ndo_validate_addr      = eth_validate_addr,
1143         .ndo_set_mac_address    = eth_mac_addr,
1144         .ndo_fill_metadata_dst  = geneve_fill_metadata_dst,
1145 };
1146
1147 static void geneve_get_drvinfo(struct net_device *dev,
1148                                struct ethtool_drvinfo *drvinfo)
1149 {
1150         strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
1151         strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
1152 }
1153
1154 static const struct ethtool_ops geneve_ethtool_ops = {
1155         .get_drvinfo    = geneve_get_drvinfo,
1156         .get_link       = ethtool_op_get_link,
1157 };
1158
1159 /* Info for udev, that this is a virtual tunnel endpoint */
1160 static struct device_type geneve_type = {
1161         .name = "geneve",
1162 };
1163
1164 /* Calls the ndo_udp_tunnel_add of the caller in order to
1165  * supply the listening GENEVE udp ports. Callers are expected
1166  * to implement the ndo_udp_tunnel_add.
1167  */
1168 static void geneve_offload_rx_ports(struct net_device *dev, bool push)
1169 {
1170         struct net *net = dev_net(dev);
1171         struct geneve_net *gn = net_generic(net, geneve_net_id);
1172         struct geneve_sock *gs;
1173
1174         rcu_read_lock();
1175         list_for_each_entry_rcu(gs, &gn->sock_list, list) {
1176                 if (push) {
1177                         udp_tunnel_push_rx_port(dev, gs->sock,
1178                                                 UDP_TUNNEL_TYPE_GENEVE);
1179                 } else {
1180                         udp_tunnel_drop_rx_port(dev, gs->sock,
1181                                                 UDP_TUNNEL_TYPE_GENEVE);
1182                 }
1183         }
1184         rcu_read_unlock();
1185 }
1186
1187 /* Initialize the device structure. */
1188 static void geneve_setup(struct net_device *dev)
1189 {
1190         ether_setup(dev);
1191
1192         dev->netdev_ops = &geneve_netdev_ops;
1193         dev->ethtool_ops = &geneve_ethtool_ops;
1194         dev->needs_free_netdev = true;
1195
1196         SET_NETDEV_DEVTYPE(dev, &geneve_type);
1197
1198         dev->features    |= NETIF_F_LLTX;
1199         dev->features    |= NETIF_F_SG | NETIF_F_HW_CSUM;
1200         dev->features    |= NETIF_F_RXCSUM;
1201         dev->features    |= NETIF_F_GSO_SOFTWARE;
1202
1203         dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
1204         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1205
1206         /* MTU range: 68 - (something less than 65535) */
1207         dev->min_mtu = ETH_MIN_MTU;
1208         /* The max_mtu calculation does not take account of GENEVE
1209          * options, to avoid excluding potentially valid
1210          * configurations. This will be further reduced by IPvX hdr size.
1211          */
1212         dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len;
1213
1214         netif_keep_dst(dev);
1215         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1216         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
1217         eth_hw_addr_random(dev);
1218 }
1219
1220 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
1221         [IFLA_GENEVE_ID]                = { .type = NLA_U32 },
1222         [IFLA_GENEVE_REMOTE]            = { .len = sizeof_field(struct iphdr, daddr) },
1223         [IFLA_GENEVE_REMOTE6]           = { .len = sizeof(struct in6_addr) },
1224         [IFLA_GENEVE_TTL]               = { .type = NLA_U8 },
1225         [IFLA_GENEVE_TOS]               = { .type = NLA_U8 },
1226         [IFLA_GENEVE_LABEL]             = { .type = NLA_U32 },
1227         [IFLA_GENEVE_PORT]              = { .type = NLA_U16 },
1228         [IFLA_GENEVE_COLLECT_METADATA]  = { .type = NLA_FLAG },
1229         [IFLA_GENEVE_UDP_CSUM]          = { .type = NLA_U8 },
1230         [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
1231         [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
1232         [IFLA_GENEVE_TTL_INHERIT]       = { .type = NLA_U8 },
1233         [IFLA_GENEVE_DF]                = { .type = NLA_U8 },
1234 };
1235
1236 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[],
1237                            struct netlink_ext_ack *extack)
1238 {
1239         if (tb[IFLA_ADDRESS]) {
1240                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
1241                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1242                                             "Provided link layer address is not Ethernet");
1243                         return -EINVAL;
1244                 }
1245
1246                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
1247                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1248                                             "Provided Ethernet address is not unicast");
1249                         return -EADDRNOTAVAIL;
1250                 }
1251         }
1252
1253         if (!data) {
1254                 NL_SET_ERR_MSG(extack,
1255                                "Not enough attributes provided to perform the operation");
1256                 return -EINVAL;
1257         }
1258
1259         if (data[IFLA_GENEVE_ID]) {
1260                 __u32 vni =  nla_get_u32(data[IFLA_GENEVE_ID]);
1261
1262                 if (vni >= GENEVE_N_VID) {
1263                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID],
1264                                             "Geneve ID must be lower than 16777216");
1265                         return -ERANGE;
1266                 }
1267         }
1268
1269         if (data[IFLA_GENEVE_DF]) {
1270                 enum ifla_geneve_df df = nla_get_u8(data[IFLA_GENEVE_DF]);
1271
1272                 if (df < 0 || df > GENEVE_DF_MAX) {
1273                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_DF],
1274                                             "Invalid DF attribute");
1275                         return -EINVAL;
1276                 }
1277         }
1278
1279         return 0;
1280 }
1281
1282 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
1283                                           const struct ip_tunnel_info *info,
1284                                           bool *tun_on_same_port,
1285                                           bool *tun_collect_md)
1286 {
1287         struct geneve_dev *geneve, *t = NULL;
1288
1289         *tun_on_same_port = false;
1290         *tun_collect_md = false;
1291         list_for_each_entry(geneve, &gn->geneve_list, next) {
1292                 if (info->key.tp_dst == geneve->cfg.info.key.tp_dst) {
1293                         *tun_collect_md = geneve->cfg.collect_md;
1294                         *tun_on_same_port = true;
1295                 }
1296                 if (info->key.tun_id == geneve->cfg.info.key.tun_id &&
1297                     info->key.tp_dst == geneve->cfg.info.key.tp_dst &&
1298                     !memcmp(&info->key.u, &geneve->cfg.info.key.u, sizeof(info->key.u)))
1299                         t = geneve;
1300         }
1301         return t;
1302 }
1303
1304 static bool is_tnl_info_zero(const struct ip_tunnel_info *info)
1305 {
1306         return !(info->key.tun_id || info->key.tun_flags || info->key.tos ||
1307                  info->key.ttl || info->key.label || info->key.tp_src ||
1308                  memchr_inv(&info->key.u, 0, sizeof(info->key.u)));
1309 }
1310
1311 static bool geneve_dst_addr_equal(struct ip_tunnel_info *a,
1312                                   struct ip_tunnel_info *b)
1313 {
1314         if (ip_tunnel_info_af(a) == AF_INET)
1315                 return a->key.u.ipv4.dst == b->key.u.ipv4.dst;
1316         else
1317                 return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst);
1318 }
1319
1320 static int geneve_configure(struct net *net, struct net_device *dev,
1321                             struct netlink_ext_ack *extack,
1322                             const struct geneve_config *cfg)
1323 {
1324         struct geneve_net *gn = net_generic(net, geneve_net_id);
1325         struct geneve_dev *t, *geneve = netdev_priv(dev);
1326         const struct ip_tunnel_info *info = &cfg->info;
1327         bool tun_collect_md, tun_on_same_port;
1328         int err, encap_len;
1329
1330         if (cfg->collect_md && !is_tnl_info_zero(info)) {
1331                 NL_SET_ERR_MSG(extack,
1332                                "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified");
1333                 return -EINVAL;
1334         }
1335
1336         geneve->net = net;
1337         geneve->dev = dev;
1338
1339         t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md);
1340         if (t)
1341                 return -EBUSY;
1342
1343         /* make enough headroom for basic scenario */
1344         encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
1345         if (!cfg->collect_md && ip_tunnel_info_af(info) == AF_INET) {
1346                 encap_len += sizeof(struct iphdr);
1347                 dev->max_mtu -= sizeof(struct iphdr);
1348         } else {
1349                 encap_len += sizeof(struct ipv6hdr);
1350                 dev->max_mtu -= sizeof(struct ipv6hdr);
1351         }
1352         dev->needed_headroom = encap_len + ETH_HLEN;
1353
1354         if (cfg->collect_md) {
1355                 if (tun_on_same_port) {
1356                         NL_SET_ERR_MSG(extack,
1357                                        "There can be only one externally controlled device on a destination port");
1358                         return -EPERM;
1359                 }
1360         } else {
1361                 if (tun_collect_md) {
1362                         NL_SET_ERR_MSG(extack,
1363                                        "There already exists an externally controlled device on this destination port");
1364                         return -EPERM;
1365                 }
1366         }
1367
1368         dst_cache_reset(&geneve->cfg.info.dst_cache);
1369         memcpy(&geneve->cfg, cfg, sizeof(*cfg));
1370
1371         err = register_netdevice(dev);
1372         if (err)
1373                 return err;
1374
1375         list_add(&geneve->next, &gn->geneve_list);
1376         return 0;
1377 }
1378
1379 static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port)
1380 {
1381         memset(info, 0, sizeof(*info));
1382         info->key.tp_dst = htons(dst_port);
1383 }
1384
1385 static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[],
1386                           struct netlink_ext_ack *extack,
1387                           struct geneve_config *cfg, bool changelink)
1388 {
1389         struct ip_tunnel_info *info = &cfg->info;
1390         int attrtype;
1391
1392         if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) {
1393                 NL_SET_ERR_MSG(extack,
1394                                "Cannot specify both IPv4 and IPv6 Remote addresses");
1395                 return -EINVAL;
1396         }
1397
1398         if (data[IFLA_GENEVE_REMOTE]) {
1399                 if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) {
1400                         attrtype = IFLA_GENEVE_REMOTE;
1401                         goto change_notsup;
1402                 }
1403
1404                 info->key.u.ipv4.dst =
1405                         nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
1406
1407                 if (ipv4_is_multicast(info->key.u.ipv4.dst)) {
1408                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE],
1409                                             "Remote IPv4 address cannot be Multicast");
1410                         return -EINVAL;
1411                 }
1412         }
1413
1414         if (data[IFLA_GENEVE_REMOTE6]) {
1415 #if IS_ENABLED(CONFIG_IPV6)
1416                 if (changelink && (ip_tunnel_info_af(info) == AF_INET)) {
1417                         attrtype = IFLA_GENEVE_REMOTE6;
1418                         goto change_notsup;
1419                 }
1420
1421                 info->mode = IP_TUNNEL_INFO_IPV6;
1422                 info->key.u.ipv6.dst =
1423                         nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
1424
1425                 if (ipv6_addr_type(&info->key.u.ipv6.dst) &
1426                     IPV6_ADDR_LINKLOCAL) {
1427                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1428                                             "Remote IPv6 address cannot be link-local");
1429                         return -EINVAL;
1430                 }
1431                 if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) {
1432                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1433                                             "Remote IPv6 address cannot be Multicast");
1434                         return -EINVAL;
1435                 }
1436                 info->key.tun_flags |= TUNNEL_CSUM;
1437                 cfg->use_udp6_rx_checksums = true;
1438 #else
1439                 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1440                                     "IPv6 support not enabled in the kernel");
1441                 return -EPFNOSUPPORT;
1442 #endif
1443         }
1444
1445         if (data[IFLA_GENEVE_ID]) {
1446                 __u32 vni;
1447                 __u8 tvni[3];
1448                 __be64 tunid;
1449
1450                 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1451                 tvni[0] = (vni & 0x00ff0000) >> 16;
1452                 tvni[1] = (vni & 0x0000ff00) >> 8;
1453                 tvni[2] =  vni & 0x000000ff;
1454
1455                 tunid = vni_to_tunnel_id(tvni);
1456                 if (changelink && (tunid != info->key.tun_id)) {
1457                         attrtype = IFLA_GENEVE_ID;
1458                         goto change_notsup;
1459                 }
1460                 info->key.tun_id = tunid;
1461         }
1462
1463         if (data[IFLA_GENEVE_TTL_INHERIT]) {
1464                 if (nla_get_u8(data[IFLA_GENEVE_TTL_INHERIT]))
1465                         cfg->ttl_inherit = true;
1466                 else
1467                         cfg->ttl_inherit = false;
1468         } else if (data[IFLA_GENEVE_TTL]) {
1469                 info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
1470                 cfg->ttl_inherit = false;
1471         }
1472
1473         if (data[IFLA_GENEVE_TOS])
1474                 info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
1475
1476         if (data[IFLA_GENEVE_DF])
1477                 cfg->df = nla_get_u8(data[IFLA_GENEVE_DF]);
1478
1479         if (data[IFLA_GENEVE_LABEL]) {
1480                 info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) &
1481                                   IPV6_FLOWLABEL_MASK;
1482                 if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) {
1483                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL],
1484                                             "Label attribute only applies for IPv6 Geneve devices");
1485                         return -EINVAL;
1486                 }
1487         }
1488
1489         if (data[IFLA_GENEVE_PORT]) {
1490                 if (changelink) {
1491                         attrtype = IFLA_GENEVE_PORT;
1492                         goto change_notsup;
1493                 }
1494                 info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]);
1495         }
1496
1497         if (data[IFLA_GENEVE_COLLECT_METADATA]) {
1498                 if (changelink) {
1499                         attrtype = IFLA_GENEVE_COLLECT_METADATA;
1500                         goto change_notsup;
1501                 }
1502                 cfg->collect_md = true;
1503         }
1504
1505         if (data[IFLA_GENEVE_UDP_CSUM]) {
1506                 if (changelink) {
1507                         attrtype = IFLA_GENEVE_UDP_CSUM;
1508                         goto change_notsup;
1509                 }
1510                 if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
1511                         info->key.tun_flags |= TUNNEL_CSUM;
1512         }
1513
1514         if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) {
1515 #if IS_ENABLED(CONFIG_IPV6)
1516                 if (changelink) {
1517                         attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX;
1518                         goto change_notsup;
1519                 }
1520                 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
1521                         info->key.tun_flags &= ~TUNNEL_CSUM;
1522 #else
1523                 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX],
1524                                     "IPv6 support not enabled in the kernel");
1525                 return -EPFNOSUPPORT;
1526 #endif
1527         }
1528
1529         if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) {
1530 #if IS_ENABLED(CONFIG_IPV6)
1531                 if (changelink) {
1532                         attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX;
1533                         goto change_notsup;
1534                 }
1535                 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
1536                         cfg->use_udp6_rx_checksums = false;
1537 #else
1538                 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX],
1539                                     "IPv6 support not enabled in the kernel");
1540                 return -EPFNOSUPPORT;
1541 #endif
1542         }
1543
1544         return 0;
1545 change_notsup:
1546         NL_SET_ERR_MSG_ATTR(extack, data[attrtype],
1547                             "Changing VNI, Port, endpoint IP address family, external, and UDP checksum attributes are not supported");
1548         return -EOPNOTSUPP;
1549 }
1550
1551 static void geneve_link_config(struct net_device *dev,
1552                                struct ip_tunnel_info *info, struct nlattr *tb[])
1553 {
1554         struct geneve_dev *geneve = netdev_priv(dev);
1555         int ldev_mtu = 0;
1556
1557         if (tb[IFLA_MTU]) {
1558                 geneve_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1559                 return;
1560         }
1561
1562         switch (ip_tunnel_info_af(info)) {
1563         case AF_INET: {
1564                 struct flowi4 fl4 = { .daddr = info->key.u.ipv4.dst };
1565                 struct rtable *rt = ip_route_output_key(geneve->net, &fl4);
1566
1567                 if (!IS_ERR(rt) && rt->dst.dev) {
1568                         ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV4_HLEN;
1569                         ip_rt_put(rt);
1570                 }
1571                 break;
1572         }
1573 #if IS_ENABLED(CONFIG_IPV6)
1574         case AF_INET6: {
1575                 struct rt6_info *rt;
1576
1577                 if (!__in6_dev_get(dev))
1578                         break;
1579
1580                 rt = rt6_lookup(geneve->net, &info->key.u.ipv6.dst, NULL, 0,
1581                                 NULL, 0);
1582
1583                 if (rt && rt->dst.dev)
1584                         ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV6_HLEN;
1585                 ip6_rt_put(rt);
1586                 break;
1587         }
1588 #endif
1589         }
1590
1591         if (ldev_mtu <= 0)
1592                 return;
1593
1594         geneve_change_mtu(dev, ldev_mtu - info->options_len);
1595 }
1596
1597 static int geneve_newlink(struct net *net, struct net_device *dev,
1598                           struct nlattr *tb[], struct nlattr *data[],
1599                           struct netlink_ext_ack *extack)
1600 {
1601         struct geneve_config cfg = {
1602                 .df = GENEVE_DF_UNSET,
1603                 .use_udp6_rx_checksums = false,
1604                 .ttl_inherit = false,
1605                 .collect_md = false,
1606         };
1607         int err;
1608
1609         init_tnl_info(&cfg.info, GENEVE_UDP_PORT);
1610         err = geneve_nl2info(tb, data, extack, &cfg, false);
1611         if (err)
1612                 return err;
1613
1614         err = geneve_configure(net, dev, extack, &cfg);
1615         if (err)
1616                 return err;
1617
1618         geneve_link_config(dev, &cfg.info, tb);
1619
1620         return 0;
1621 }
1622
1623 /* Quiesces the geneve device data path for both TX and RX.
1624  *
1625  * On transmit geneve checks for non-NULL geneve_sock before it proceeds.
1626  * So, if we set that socket to NULL under RCU and wait for synchronize_net()
1627  * to complete for the existing set of in-flight packets to be transmitted,
1628  * then we would have quiesced the transmit data path. All the future packets
1629  * will get dropped until we unquiesce the data path.
1630  *
1631  * On receive geneve dereference the geneve_sock stashed in the socket. So,
1632  * if we set that to NULL under RCU and wait for synchronize_net() to
1633  * complete, then we would have quiesced the receive data path.
1634  */
1635 static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4,
1636                            struct geneve_sock **gs6)
1637 {
1638         *gs4 = rtnl_dereference(geneve->sock4);
1639         rcu_assign_pointer(geneve->sock4, NULL);
1640         if (*gs4)
1641                 rcu_assign_sk_user_data((*gs4)->sock->sk, NULL);
1642 #if IS_ENABLED(CONFIG_IPV6)
1643         *gs6 = rtnl_dereference(geneve->sock6);
1644         rcu_assign_pointer(geneve->sock6, NULL);
1645         if (*gs6)
1646                 rcu_assign_sk_user_data((*gs6)->sock->sk, NULL);
1647 #else
1648         *gs6 = NULL;
1649 #endif
1650         synchronize_net();
1651 }
1652
1653 /* Resumes the geneve device data path for both TX and RX. */
1654 static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4,
1655                              struct geneve_sock __maybe_unused *gs6)
1656 {
1657         rcu_assign_pointer(geneve->sock4, gs4);
1658         if (gs4)
1659                 rcu_assign_sk_user_data(gs4->sock->sk, gs4);
1660 #if IS_ENABLED(CONFIG_IPV6)
1661         rcu_assign_pointer(geneve->sock6, gs6);
1662         if (gs6)
1663                 rcu_assign_sk_user_data(gs6->sock->sk, gs6);
1664 #endif
1665         synchronize_net();
1666 }
1667
1668 static int geneve_changelink(struct net_device *dev, struct nlattr *tb[],
1669                              struct nlattr *data[],
1670                              struct netlink_ext_ack *extack)
1671 {
1672         struct geneve_dev *geneve = netdev_priv(dev);
1673         struct geneve_sock *gs4, *gs6;
1674         struct geneve_config cfg;
1675         int err;
1676
1677         /* If the geneve device is configured for metadata (or externally
1678          * controlled, for example, OVS), then nothing can be changed.
1679          */
1680         if (geneve->cfg.collect_md)
1681                 return -EOPNOTSUPP;
1682
1683         /* Start with the existing info. */
1684         memcpy(&cfg, &geneve->cfg, sizeof(cfg));
1685         err = geneve_nl2info(tb, data, extack, &cfg, true);
1686         if (err)
1687                 return err;
1688
1689         if (!geneve_dst_addr_equal(&geneve->cfg.info, &cfg.info)) {
1690                 dst_cache_reset(&cfg.info.dst_cache);
1691                 geneve_link_config(dev, &cfg.info, tb);
1692         }
1693
1694         geneve_quiesce(geneve, &gs4, &gs6);
1695         memcpy(&geneve->cfg, &cfg, sizeof(cfg));
1696         geneve_unquiesce(geneve, gs4, gs6);
1697
1698         return 0;
1699 }
1700
1701 static void geneve_dellink(struct net_device *dev, struct list_head *head)
1702 {
1703         struct geneve_dev *geneve = netdev_priv(dev);
1704
1705         list_del(&geneve->next);
1706         unregister_netdevice_queue(dev, head);
1707 }
1708
1709 static size_t geneve_get_size(const struct net_device *dev)
1710 {
1711         return nla_total_size(sizeof(__u32)) +  /* IFLA_GENEVE_ID */
1712                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */
1713                 nla_total_size(sizeof(__u8)) +  /* IFLA_GENEVE_TTL */
1714                 nla_total_size(sizeof(__u8)) +  /* IFLA_GENEVE_TOS */
1715                 nla_total_size(sizeof(__u8)) +  /* IFLA_GENEVE_DF */
1716                 nla_total_size(sizeof(__be32)) +  /* IFLA_GENEVE_LABEL */
1717                 nla_total_size(sizeof(__be16)) +  /* IFLA_GENEVE_PORT */
1718                 nla_total_size(0) +      /* IFLA_GENEVE_COLLECT_METADATA */
1719                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */
1720                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */
1721                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */
1722                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL_INHERIT */
1723                 0;
1724 }
1725
1726 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
1727 {
1728         struct geneve_dev *geneve = netdev_priv(dev);
1729         struct ip_tunnel_info *info = &geneve->cfg.info;
1730         bool ttl_inherit = geneve->cfg.ttl_inherit;
1731         bool metadata = geneve->cfg.collect_md;
1732         __u8 tmp_vni[3];
1733         __u32 vni;
1734
1735         tunnel_id_to_vni(info->key.tun_id, tmp_vni);
1736         vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2];
1737         if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
1738                 goto nla_put_failure;
1739
1740         if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
1741                 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
1742                                     info->key.u.ipv4.dst))
1743                         goto nla_put_failure;
1744                 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM,
1745                                !!(info->key.tun_flags & TUNNEL_CSUM)))
1746                         goto nla_put_failure;
1747
1748 #if IS_ENABLED(CONFIG_IPV6)
1749         } else if (!metadata) {
1750                 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6,
1751                                      &info->key.u.ipv6.dst))
1752                         goto nla_put_failure;
1753                 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
1754                                !(info->key.tun_flags & TUNNEL_CSUM)))
1755                         goto nla_put_failure;
1756 #endif
1757         }
1758
1759         if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) ||
1760             nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) ||
1761             nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label))
1762                 goto nla_put_failure;
1763
1764         if (nla_put_u8(skb, IFLA_GENEVE_DF, geneve->cfg.df))
1765                 goto nla_put_failure;
1766
1767         if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst))
1768                 goto nla_put_failure;
1769
1770         if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
1771                 goto nla_put_failure;
1772
1773 #if IS_ENABLED(CONFIG_IPV6)
1774         if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
1775                        !geneve->cfg.use_udp6_rx_checksums))
1776                 goto nla_put_failure;
1777 #endif
1778
1779         if (nla_put_u8(skb, IFLA_GENEVE_TTL_INHERIT, ttl_inherit))
1780                 goto nla_put_failure;
1781
1782         return 0;
1783
1784 nla_put_failure:
1785         return -EMSGSIZE;
1786 }
1787
1788 static struct rtnl_link_ops geneve_link_ops __read_mostly = {
1789         .kind           = "geneve",
1790         .maxtype        = IFLA_GENEVE_MAX,
1791         .policy         = geneve_policy,
1792         .priv_size      = sizeof(struct geneve_dev),
1793         .setup          = geneve_setup,
1794         .validate       = geneve_validate,
1795         .newlink        = geneve_newlink,
1796         .changelink     = geneve_changelink,
1797         .dellink        = geneve_dellink,
1798         .get_size       = geneve_get_size,
1799         .fill_info      = geneve_fill_info,
1800 };
1801
1802 struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
1803                                         u8 name_assign_type, u16 dst_port)
1804 {
1805         struct nlattr *tb[IFLA_MAX + 1];
1806         struct net_device *dev;
1807         LIST_HEAD(list_kill);
1808         int err;
1809         struct geneve_config cfg = {
1810                 .df = GENEVE_DF_UNSET,
1811                 .use_udp6_rx_checksums = true,
1812                 .ttl_inherit = false,
1813                 .collect_md = true,
1814         };
1815
1816         memset(tb, 0, sizeof(tb));
1817         dev = rtnl_create_link(net, name, name_assign_type,
1818                                &geneve_link_ops, tb, NULL);
1819         if (IS_ERR(dev))
1820                 return dev;
1821
1822         init_tnl_info(&cfg.info, dst_port);
1823         err = geneve_configure(net, dev, NULL, &cfg);
1824         if (err) {
1825                 free_netdev(dev);
1826                 return ERR_PTR(err);
1827         }
1828
1829         /* openvswitch users expect packet sizes to be unrestricted,
1830          * so set the largest MTU we can.
1831          */
1832         err = geneve_change_mtu(dev, IP_MAX_MTU);
1833         if (err)
1834                 goto err;
1835
1836         err = rtnl_configure_link(dev, NULL);
1837         if (err < 0)
1838                 goto err;
1839
1840         return dev;
1841 err:
1842         geneve_dellink(dev, &list_kill);
1843         unregister_netdevice_many(&list_kill);
1844         return ERR_PTR(err);
1845 }
1846 EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
1847
1848 static int geneve_netdevice_event(struct notifier_block *unused,
1849                                   unsigned long event, void *ptr)
1850 {
1851         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1852
1853         if (event == NETDEV_UDP_TUNNEL_PUSH_INFO ||
1854             event == NETDEV_UDP_TUNNEL_DROP_INFO) {
1855                 geneve_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO);
1856         } else if (event == NETDEV_UNREGISTER) {
1857                 if (!dev->udp_tunnel_nic_info)
1858                         geneve_offload_rx_ports(dev, false);
1859         } else if (event == NETDEV_REGISTER) {
1860                 if (!dev->udp_tunnel_nic_info)
1861                         geneve_offload_rx_ports(dev, true);
1862         }
1863
1864         return NOTIFY_DONE;
1865 }
1866
1867 static struct notifier_block geneve_notifier_block __read_mostly = {
1868         .notifier_call = geneve_netdevice_event,
1869 };
1870
1871 static __net_init int geneve_init_net(struct net *net)
1872 {
1873         struct geneve_net *gn = net_generic(net, geneve_net_id);
1874
1875         INIT_LIST_HEAD(&gn->geneve_list);
1876         INIT_LIST_HEAD(&gn->sock_list);
1877         return 0;
1878 }
1879
1880 static void geneve_destroy_tunnels(struct net *net, struct list_head *head)
1881 {
1882         struct geneve_net *gn = net_generic(net, geneve_net_id);
1883         struct geneve_dev *geneve, *next;
1884         struct net_device *dev, *aux;
1885
1886         /* gather any geneve devices that were moved into this ns */
1887         for_each_netdev_safe(net, dev, aux)
1888                 if (dev->rtnl_link_ops == &geneve_link_ops)
1889                         unregister_netdevice_queue(dev, head);
1890
1891         /* now gather any other geneve devices that were created in this ns */
1892         list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
1893                 /* If geneve->dev is in the same netns, it was already added
1894                  * to the list by the previous loop.
1895                  */
1896                 if (!net_eq(dev_net(geneve->dev), net))
1897                         unregister_netdevice_queue(geneve->dev, head);
1898         }
1899 }
1900
1901 static void __net_exit geneve_exit_batch_net(struct list_head *net_list)
1902 {
1903         struct net *net;
1904         LIST_HEAD(list);
1905
1906         rtnl_lock();
1907         list_for_each_entry(net, net_list, exit_list)
1908                 geneve_destroy_tunnels(net, &list);
1909
1910         /* unregister the devices gathered above */
1911         unregister_netdevice_many(&list);
1912         rtnl_unlock();
1913
1914         list_for_each_entry(net, net_list, exit_list) {
1915                 const struct geneve_net *gn = net_generic(net, geneve_net_id);
1916
1917                 WARN_ON_ONCE(!list_empty(&gn->sock_list));
1918         }
1919 }
1920
1921 static struct pernet_operations geneve_net_ops = {
1922         .init = geneve_init_net,
1923         .exit_batch = geneve_exit_batch_net,
1924         .id   = &geneve_net_id,
1925         .size = sizeof(struct geneve_net),
1926 };
1927
1928 static int __init geneve_init_module(void)
1929 {
1930         int rc;
1931
1932         rc = register_pernet_subsys(&geneve_net_ops);
1933         if (rc)
1934                 goto out1;
1935
1936         rc = register_netdevice_notifier(&geneve_notifier_block);
1937         if (rc)
1938                 goto out2;
1939
1940         rc = rtnl_link_register(&geneve_link_ops);
1941         if (rc)
1942                 goto out3;
1943
1944         return 0;
1945 out3:
1946         unregister_netdevice_notifier(&geneve_notifier_block);
1947 out2:
1948         unregister_pernet_subsys(&geneve_net_ops);
1949 out1:
1950         return rc;
1951 }
1952 late_initcall(geneve_init_module);
1953
1954 static void __exit geneve_cleanup_module(void)
1955 {
1956         rtnl_link_unregister(&geneve_link_ops);
1957         unregister_netdevice_notifier(&geneve_notifier_block);
1958         unregister_pernet_subsys(&geneve_net_ops);
1959 }
1960 module_exit(geneve_cleanup_module);
1961
1962 MODULE_LICENSE("GPL");
1963 MODULE_VERSION(GENEVE_NETDEV_VER);
1964 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
1965 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
1966 MODULE_ALIAS_RTNL_LINK("geneve");