drivers/net/vxlan.c

   1 /*
   2  * VXLAN: Virtual eXtensible Local Area Network
   3  *
   4  * Copyright (c) 2012-2013 Vyatta Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  12
  13 #include <linux/kernel.h>
  14 #include <linux/types.h>
  15 #include <linux/module.h>
  16 #include <linux/errno.h>
  17 #include <linux/slab.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/rculist.h>
  20 #include <linux/netdevice.h>
  21 #include <linux/in.h>
  22 #include <linux/ip.h>
  23 #include <linux/udp.h>
  24 #include <linux/igmp.h>
  25 #include <linux/etherdevice.h>
  26 #include <linux/if_ether.h>
  27 #include <linux/if_vlan.h>
  28 #include <linux/hash.h>
  29 #include <linux/ethtool.h>
  30 #include <net/arp.h>
  31 #include <net/ndisc.h>
  32 #include <net/ip.h>
  33 #include <net/ip_tunnels.h>
  34 #include <net/icmp.h>
  35 #include <net/udp.h>
  36 #include <net/udp_tunnel.h>
  37 #include <net/rtnetlink.h>
  38 #include <net/route.h>
  39 #include <net/dsfield.h>
  40 #include <net/inet_ecn.h>
  41 #include <net/net_namespace.h>
  42 #include <net/netns/generic.h>
  43 #include <net/vxlan.h>
  44 #include <net/protocol.h>
  45
  46 #if IS_ENABLED(CONFIG_IPV6)
  47 #include <net/ipv6.h>
  48 #include <net/addrconf.h>
  49 #include <net/ip6_tunnel.h>
  50 #include <net/ip6_checksum.h>
  51 #endif
  52 #include <net/dst_metadata.h>
  53
  54 #define VXLAN_VERSION   "0.1"
  55
  56 #define PORT_HASH_BITS  8
  57 #define PORT_HASH_SIZE  (1<<PORT_HASH_BITS)
  58 #define FDB_AGE_DEFAULT 300 /* 5 min */
  59 #define FDB_AGE_INTERVAL (10 * HZ)      /* rescan interval */
  60
  61 /* UDP port for VXLAN traffic.
  62  * The IANA assigned port is 4789, but the Linux default is 8472
  63  * for compatibility with early adopters.
  64  */
  65 static unsigned short vxlan_port __read_mostly = 8472;
  66 module_param_named(udp_port, vxlan_port, ushort, 0444);
  67 MODULE_PARM_DESC(udp_port, "Destination UDP port");
  68
  69 static bool log_ecn_error = true;
  70 module_param(log_ecn_error, bool, 0644);
  71 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
  72
  73 static int vxlan_net_id;
  74 static struct rtnl_link_ops vxlan_link_ops;
  75
  76 static const u8 all_zeros_mac[ETH_ALEN + 2];
  77
  78 static int vxlan_sock_add(struct vxlan_dev *vxlan);
  79
  80 /* per-network namespace private data for this module */
  81 struct vxlan_net {
  82         struct list_head  vxlan_list;
  83         struct hlist_head sock_list[PORT_HASH_SIZE];
  84         spinlock_t        sock_lock;
  85 };
  86
  87 /* Forwarding table entry */
  88 struct vxlan_fdb {
  89         struct hlist_node hlist;        /* linked list of entries */
  90         struct rcu_head   rcu;
  91         unsigned long     updated;      /* jiffies */
  92         unsigned long     used;
  93         struct list_head  remotes;
  94         u8                eth_addr[ETH_ALEN];
  95         u16               state;        /* see ndm_state */
  96         u8                flags;        /* see ndm_flags */
  97 };
  98
  99 /* salt for hash table */
 100 static u32 vxlan_salt __read_mostly;
 101 static struct workqueue_struct *vxlan_wq;
 102
 103 static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
 104 {
 105         return vs->flags & VXLAN_F_COLLECT_METADATA ||
 106                ip_tunnel_collect_metadata();
 107 }
 108
 109 #if IS_ENABLED(CONFIG_IPV6)
 110 static inline
 111 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
 112 {
 113         if (a->sa.sa_family != b->sa.sa_family)
 114                 return false;
 115         if (a->sa.sa_family == AF_INET6)
 116                 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
 117         else
 118                 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
 119 }
 120
 121 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
 122 {
 123         if (ipa->sa.sa_family == AF_INET6)
 124                 return ipv6_addr_any(&ipa->sin6.sin6_addr);
 125         else
 126                 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
 127 }
 128
 129 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
 130 {
 131         if (ipa->sa.sa_family == AF_INET6)
 132                 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
 133         else
 134                 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
 135 }
 136
 137 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
 138 {
 139         if (nla_len(nla) >= sizeof(struct in6_addr)) {
 140                 ip->sin6.sin6_addr = nla_get_in6_addr(nla);
 141                 ip->sa.sa_family = AF_INET6;
 142                 return 0;
 143         } else if (nla_len(nla) >= sizeof(__be32)) {
 144                 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
 145                 ip->sa.sa_family = AF_INET;
 146                 return 0;
 147         } else {
 148                 return -EAFNOSUPPORT;
 149         }
 150 }
 151
 152 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
 153                               const union vxlan_addr *ip)
 154 {
 155         if (ip->sa.sa_family == AF_INET6)
 156                 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
 157         else
 158                 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
 159 }
 160
 161 #else /* !CONFIG_IPV6 */
 162
 163 static inline
 164 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
 165 {
 166         return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
 167 }
 168
 169 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
 170 {
 171         return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
 172 }
 173
 174 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
 175 {
 176         return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
 177 }
 178
 179 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
 180 {
 181         if (nla_len(nla) >= sizeof(struct in6_addr)) {
 182                 return -EAFNOSUPPORT;
 183         } else if (nla_len(nla) >= sizeof(__be32)) {
 184                 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
 185                 ip->sa.sa_family = AF_INET;
 186                 return 0;
 187         } else {
 188                 return -EAFNOSUPPORT;
 189         }
 190 }
 191
 192 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
 193                               const union vxlan_addr *ip)
 194 {
 195         return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
 196 }
 197 #endif
 198
 199 /* Virtual Network hash table head */
 200 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, __be32 vni)
 201 {
 202         return &vs->vni_list[hash_32((__force u32)vni, VNI_HASH_BITS)];
 203 }
 204
 205 /* Socket hash table head */
 206 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
 207 {
 208         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
 209
 210         return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
 211 }
 212
 213 /* First remote destination for a forwarding entry.
 214  * Guaranteed to be non-NULL because remotes are never deleted.
 215  */
 216 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
 217 {
 218         return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
 219 }
 220
 221 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
 222 {
 223         return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
 224 }
 225
 226 /* Find VXLAN socket based on network namespace, address family and UDP port
 227  * and enabled unshareable flags.
 228  */
 229 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
 230                                           __be16 port, u32 flags)
 231 {
 232         struct vxlan_sock *vs;
 233
 234         flags &= VXLAN_F_RCV_FLAGS;
 235
 236         hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
 237                 if (inet_sk(vs->sock->sk)->inet_sport == port &&
 238                     vxlan_get_sk_family(vs) == family &&
 239                     vs->flags == flags)
 240                         return vs;
 241         }
 242         return NULL;
 243 }
 244
 245 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, __be32 vni)
 246 {
 247         struct vxlan_dev *vxlan;
 248
 249         /* For flow based devices, map all packets to VNI 0 */
 250         if (vs->flags & VXLAN_F_COLLECT_METADATA)
 251                 vni = 0;
 252
 253         hlist_for_each_entry_rcu(vxlan, vni_head(vs, vni), hlist) {
 254                 if (vxlan->default_dst.remote_vni == vni)
 255                         return vxlan;
 256         }
 257
 258         return NULL;
 259 }
 260
 261 /* Look up VNI in a per net namespace table */
 262 static struct vxlan_dev *vxlan_find_vni(struct net *net, __be32 vni,
 263                                         sa_family_t family, __be16 port,
 264                                         u32 flags)
 265 {
 266         struct vxlan_sock *vs;
 267
 268         vs = vxlan_find_sock(net, family, port, flags);
 269         if (!vs)
 270                 return NULL;
 271
 272         return vxlan_vs_find_vni(vs, vni);
 273 }
 274
 275 /* Fill in neighbour message in skbuff. */
 276 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
 277                           const struct vxlan_fdb *fdb,
 278                           u32 portid, u32 seq, int type, unsigned int flags,
 279                           const struct vxlan_rdst *rdst)
 280 {
 281         unsigned long now = jiffies;
 282         struct nda_cacheinfo ci;
 283         struct nlmsghdr *nlh;
 284         struct ndmsg *ndm;
 285         bool send_ip, send_eth;
 286
 287         nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
 288         if (nlh == NULL)
 289                 return -EMSGSIZE;
 290
 291         ndm = nlmsg_data(nlh);
 292         memset(ndm, 0, sizeof(*ndm));
 293
 294         send_eth = send_ip = true;
 295
 296         if (type == RTM_GETNEIGH) {
 297                 ndm->ndm_family = AF_INET;
 298                 send_ip = !vxlan_addr_any(&rdst->remote_ip);
 299                 send_eth = !is_zero_ether_addr(fdb->eth_addr);
 300         } else
 301                 ndm->ndm_family = AF_BRIDGE;
 302         ndm->ndm_state = fdb->state;
 303         ndm->ndm_ifindex = vxlan->dev->ifindex;
 304         ndm->ndm_flags = fdb->flags;
 305         ndm->ndm_type = RTN_UNICAST;
 306
 307         if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
 308             nla_put_s32(skb, NDA_LINK_NETNSID,
 309                         peernet2id_alloc(dev_net(vxlan->dev), vxlan->net)))
 310                 goto nla_put_failure;
 311
 312         if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
 313                 goto nla_put_failure;
 314
 315         if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
 316                 goto nla_put_failure;
 317
 318         if (rdst->remote_port && rdst->remote_port != vxlan->cfg.dst_port &&
 319             nla_put_be16(skb, NDA_PORT, rdst->remote_port))
 320                 goto nla_put_failure;
 321         if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
 322             nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni)))
 323                 goto nla_put_failure;
 324         if (rdst->remote_ifindex &&
 325             nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
 326                 goto nla_put_failure;
 327
 328         ci.ndm_used      = jiffies_to_clock_t(now - fdb->used);
 329         ci.ndm_confirmed = 0;
 330         ci.ndm_updated   = jiffies_to_clock_t(now - fdb->updated);
 331         ci.ndm_refcnt    = 0;
 332
 333         if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
 334                 goto nla_put_failure;
 335
 336         nlmsg_end(skb, nlh);
 337         return 0;
 338
 339 nla_put_failure:
 340         nlmsg_cancel(skb, nlh);
 341         return -EMSGSIZE;
 342 }
 343
 344 static inline size_t vxlan_nlmsg_size(void)
 345 {
 346         return NLMSG_ALIGN(sizeof(struct ndmsg))
 347                 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
 348                 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
 349                 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
 350                 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
 351                 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
 352                 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
 353                 + nla_total_size(sizeof(struct nda_cacheinfo));
 354 }
 355
 356 static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
 357                              struct vxlan_rdst *rd, int type)
 358 {
 359         struct net *net = dev_net(vxlan->dev);
 360         struct sk_buff *skb;
 361         int err = -ENOBUFS;
 362
 363         skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
 364         if (skb == NULL)
 365                 goto errout;
 366
 367         err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
 368         if (err < 0) {
 369                 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
 370                 WARN_ON(err == -EMSGSIZE);
 371                 kfree_skb(skb);
 372                 goto errout;
 373         }
 374
 375         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
 376         return;
 377 errout:
 378         if (err < 0)
 379                 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
 380 }
 381
 382 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
 383 {
 384         struct vxlan_dev *vxlan = netdev_priv(dev);
 385         struct vxlan_fdb f = {
 386                 .state = NUD_STALE,
 387         };
 388         struct vxlan_rdst remote = {
 389                 .remote_ip = *ipa, /* goes to NDA_DST */
 390                 .remote_vni = cpu_to_be32(VXLAN_N_VID),
 391         };
 392
 393         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
 394 }
 395
 396 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
 397 {
 398         struct vxlan_fdb f = {
 399                 .state = NUD_STALE,
 400         };
 401         struct vxlan_rdst remote = { };
 402
 403         memcpy(f.eth_addr, eth_addr, ETH_ALEN);
 404
 405         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
 406 }
 407
 408 /* Hash Ethernet address */
 409 static u32 eth_hash(const unsigned char *addr)
 410 {
 411         u64 value = get_unaligned((u64 *)addr);
 412
 413         /* only want 6 bytes */
 414 #ifdef __BIG_ENDIAN
 415         value >>= 16;
 416 #else
 417         value <<= 16;
 418 #endif
 419         return hash_64(value, FDB_HASH_BITS);
 420 }
 421
 422 /* Hash chain to use given mac address */
 423 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
 424                                                 const u8 *mac)
 425 {
 426         return &vxlan->fdb_head[eth_hash(mac)];
 427 }
 428
 429 /* Look up Ethernet address in forwarding table */
 430 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
 431                                         const u8 *mac)
 432 {
 433         struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
 434         struct vxlan_fdb *f;
 435
 436         hlist_for_each_entry_rcu(f, head, hlist) {
 437                 if (ether_addr_equal(mac, f->eth_addr))
 438                         return f;
 439         }
 440
 441         return NULL;
 442 }
 443
 444 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
 445                                         const u8 *mac)
 446 {
 447         struct vxlan_fdb *f;
 448
 449         f = __vxlan_find_mac(vxlan, mac);
 450         if (f)
 451                 f->used = jiffies;
 452
 453         return f;
 454 }
 455
 456 /* caller should hold vxlan->hash_lock */
 457 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
 458                                               union vxlan_addr *ip, __be16 port,
 459                                               __be32 vni, __u32 ifindex)
 460 {
 461         struct vxlan_rdst *rd;
 462
 463         list_for_each_entry(rd, &f->remotes, list) {
 464                 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
 465                     rd->remote_port == port &&
 466                     rd->remote_vni == vni &&
 467                     rd->remote_ifindex == ifindex)
 468                         return rd;
 469         }
 470
 471         return NULL;
 472 }
 473
 474 /* Replace destination of unicast mac */
 475 static int vxlan_fdb_replace(struct vxlan_fdb *f,
 476                              union vxlan_addr *ip, __be16 port, __be32 vni,
 477                              __u32 ifindex)
 478 {
 479         struct vxlan_rdst *rd;
 480
 481         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
 482         if (rd)
 483                 return 0;
 484
 485         rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
 486         if (!rd)
 487                 return 0;
 488
 489         dst_cache_reset(&rd->dst_cache);
 490         rd->remote_ip = *ip;
 491         rd->remote_port = port;
 492         rd->remote_vni = vni;
 493         rd->remote_ifindex = ifindex;
 494         return 1;
 495 }
 496
 497 /* Add/update destinations for multicast */
 498 static int vxlan_fdb_append(struct vxlan_fdb *f,
 499                             union vxlan_addr *ip, __be16 port, __be32 vni,
 500                             __u32 ifindex, struct vxlan_rdst **rdp)
 501 {
 502         struct vxlan_rdst *rd;
 503
 504         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
 505         if (rd)
 506                 return 0;
 507
 508         rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
 509         if (rd == NULL)
 510                 return -ENOBUFS;
 511
 512         if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) {
 513                 kfree(rd);
 514                 return -ENOBUFS;
 515         }
 516
 517         rd->remote_ip = *ip;
 518         rd->remote_port = port;
 519         rd->remote_vni = vni;
 520         rd->remote_ifindex = ifindex;
 521
 522         list_add_tail_rcu(&rd->list, &f->remotes);
 523
 524         *rdp = rd;
 525         return 1;
 526 }
 527
 528 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
 529                                           unsigned int off,
 530                                           struct vxlanhdr *vh, size_t hdrlen,
 531                                           __be32 vni_field,
 532                                           struct gro_remcsum *grc,
 533                                           bool nopartial)
 534 {
 535         size_t start, offset;
 536
 537         if (skb->remcsum_offload)
 538                 return vh;
 539
 540         if (!NAPI_GRO_CB(skb)->csum_valid)
 541                 return NULL;
 542
 543         start = vxlan_rco_start(vni_field);
 544         offset = start + vxlan_rco_offset(vni_field);
 545
 546         vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
 547                                      start, offset, grc, nopartial);
 548
 549         skb->remcsum_offload = 1;
 550
 551         return vh;
 552 }
 553
 554 static struct sk_buff **vxlan_gro_receive(struct sk_buff **head,
 555                                           struct sk_buff *skb,
 556                                           struct udp_offload *uoff)
 557 {
 558         struct sk_buff *p, **pp = NULL;
 559         struct vxlanhdr *vh, *vh2;
 560         unsigned int hlen, off_vx;
 561         int flush = 1;
 562         struct vxlan_sock *vs = container_of(uoff, struct vxlan_sock,
 563                                              udp_offloads);
 564         __be32 flags;
 565         struct gro_remcsum grc;
 566
 567         skb_gro_remcsum_init(&grc);
 568
 569         off_vx = skb_gro_offset(skb);
 570         hlen = off_vx + sizeof(*vh);
 571         vh   = skb_gro_header_fast(skb, off_vx);
 572         if (skb_gro_header_hard(skb, hlen)) {
 573                 vh = skb_gro_header_slow(skb, hlen, off_vx);
 574                 if (unlikely(!vh))
 575                         goto out;
 576         }
 577
 578         skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
 579
 580         flags = vh->vx_flags;
 581
 582         if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
 583                 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
 584                                        vh->vx_vni, &grc,
 585                                        !!(vs->flags &
 586                                           VXLAN_F_REMCSUM_NOPARTIAL));
 587
 588                 if (!vh)
 589                         goto out;
 590         }
 591
 592         skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
 593
 594         flush = 0;
 595
 596         for (p = *head; p; p = p->next) {
 597                 if (!NAPI_GRO_CB(p)->same_flow)
 598                         continue;
 599
 600                 vh2 = (struct vxlanhdr *)(p->data + off_vx);
 601                 if (vh->vx_flags != vh2->vx_flags ||
 602                     vh->vx_vni != vh2->vx_vni) {
 603                         NAPI_GRO_CB(p)->same_flow = 0;
 604                         continue;
 605                 }
 606         }
 607
 608         pp = eth_gro_receive(head, skb);
 609
 610 out:
 611         skb_gro_remcsum_cleanup(skb, &grc);
 612         NAPI_GRO_CB(skb)->flush |= flush;
 613
 614         return pp;
 615 }
 616
 617 static int vxlan_gro_complete(struct sk_buff *skb, int nhoff,
 618                               struct udp_offload *uoff)
 619 {
 620         udp_tunnel_gro_complete(skb, nhoff);
 621
 622         return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
 623 }
 624
 625 /* Notify netdevs that UDP port started listening */
 626 static void vxlan_notify_add_rx_port(struct vxlan_sock *vs)
 627 {
 628         struct net_device *dev;
 629         struct sock *sk = vs->sock->sk;
 630         struct net *net = sock_net(sk);
 631         sa_family_t sa_family = vxlan_get_sk_family(vs);
 632         __be16 port = inet_sk(sk)->inet_sport;
 633         int err;
 634
 635         if (sa_family == AF_INET) {
 636                 err = udp_add_offload(net, &vs->udp_offloads);
 637                 if (err)
 638                         pr_warn("vxlan: udp_add_offload failed with status %d\n", err);
 639         }
 640
 641         rcu_read_lock();
 642         for_each_netdev_rcu(net, dev) {
 643                 if (dev->netdev_ops->ndo_add_vxlan_port)
 644                         dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
 645                                                             port);
 646         }
 647         rcu_read_unlock();
 648 }
 649
 650 /* Notify netdevs that UDP port is no more listening */
 651 static void vxlan_notify_del_rx_port(struct vxlan_sock *vs)
 652 {
 653         struct net_device *dev;
 654         struct sock *sk = vs->sock->sk;
 655         struct net *net = sock_net(sk);
 656         sa_family_t sa_family = vxlan_get_sk_family(vs);
 657         __be16 port = inet_sk(sk)->inet_sport;
 658
 659         rcu_read_lock();
 660         for_each_netdev_rcu(net, dev) {
 661                 if (dev->netdev_ops->ndo_del_vxlan_port)
 662                         dev->netdev_ops->ndo_del_vxlan_port(dev, sa_family,
 663                                                             port);
 664         }
 665         rcu_read_unlock();
 666
 667         if (sa_family == AF_INET)
 668                 udp_del_offload(&vs->udp_offloads);
 669 }
 670
 671 /* Add new entry to forwarding table -- assumes lock held */
 672 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
 673                             const u8 *mac, union vxlan_addr *ip,
 674                             __u16 state, __u16 flags,
 675                             __be16 port, __be32 vni, __u32 ifindex,
 676                             __u8 ndm_flags)
 677 {
 678         struct vxlan_rdst *rd = NULL;
 679         struct vxlan_fdb *f;
 680         int notify = 0;
 681
 682         f = __vxlan_find_mac(vxlan, mac);
 683         if (f) {
 684                 if (flags & NLM_F_EXCL) {
 685                         netdev_dbg(vxlan->dev,
 686                                    "lost race to create %pM\n", mac);
 687                         return -EEXIST;
 688                 }
 689                 if (f->state != state) {
 690                         f->state = state;
 691                         f->updated = jiffies;
 692                         notify = 1;
 693                 }
 694                 if (f->flags != ndm_flags) {
 695                         f->flags = ndm_flags;
 696                         f->updated = jiffies;
 697                         notify = 1;
 698                 }
 699                 if ((flags & NLM_F_REPLACE)) {
 700                         /* Only change unicasts */
 701                         if (!(is_multicast_ether_addr(f->eth_addr) ||
 702                              is_zero_ether_addr(f->eth_addr))) {
 703                                 notify |= vxlan_fdb_replace(f, ip, port, vni,
 704                                                            ifindex);
 705                         } else
 706                                 return -EOPNOTSUPP;
 707                 }
 708                 if ((flags & NLM_F_APPEND) &&
 709                     (is_multicast_ether_addr(f->eth_addr) ||
 710                      is_zero_ether_addr(f->eth_addr))) {
 711                         int rc = vxlan_fdb_append(f, ip, port, vni, ifindex,
 712                                                   &rd);
 713
 714                         if (rc < 0)
 715                                 return rc;
 716                         notify |= rc;
 717                 }
 718         } else {
 719                 if (!(flags & NLM_F_CREATE))
 720                         return -ENOENT;
 721
 722                 if (vxlan->cfg.addrmax &&
 723                     vxlan->addrcnt >= vxlan->cfg.addrmax)
 724                         return -ENOSPC;
 725
 726                 /* Disallow replace to add a multicast entry */
 727                 if ((flags & NLM_F_REPLACE) &&
 728                     (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
 729                         return -EOPNOTSUPP;
 730
 731                 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
 732                 f = kmalloc(sizeof(*f), GFP_ATOMIC);
 733                 if (!f)
 734                         return -ENOMEM;
 735
 736                 notify = 1;
 737                 f->state = state;
 738                 f->flags = ndm_flags;
 739                 f->updated = f->used = jiffies;
 740                 INIT_LIST_HEAD(&f->remotes);
 741                 memcpy(f->eth_addr, mac, ETH_ALEN);
 742
 743                 vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
 744
 745                 ++vxlan->addrcnt;
 746                 hlist_add_head_rcu(&f->hlist,
 747                                    vxlan_fdb_head(vxlan, mac));
 748         }
 749
 750         if (notify) {
 751                 if (rd == NULL)
 752                         rd = first_remote_rtnl(f);
 753                 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
 754         }
 755
 756         return 0;
 757 }
 758
 759 static void vxlan_fdb_free(struct rcu_head *head)
 760 {
 761         struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
 762         struct vxlan_rdst *rd, *nd;
 763
 764         list_for_each_entry_safe(rd, nd, &f->remotes, list) {
 765                 dst_cache_destroy(&rd->dst_cache);
 766                 kfree(rd);
 767         }
 768         kfree(f);
 769 }
 770
 771 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
 772 {
 773         netdev_dbg(vxlan->dev,
 774                     "delete %pM\n", f->eth_addr);
 775
 776         --vxlan->addrcnt;
 777         vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
 778
 779         hlist_del_rcu(&f->hlist);
 780         call_rcu(&f->rcu, vxlan_fdb_free);
 781 }
 782
 783 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
 784                            union vxlan_addr *ip, __be16 *port, __be32 *vni,
 785                            u32 *ifindex)
 786 {
 787         struct net *net = dev_net(vxlan->dev);
 788         int err;
 789
 790         if (tb[NDA_DST]) {
 791                 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
 792                 if (err)
 793                         return err;
 794         } else {
 795                 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
 796                 if (remote->sa.sa_family == AF_INET) {
 797                         ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
 798                         ip->sa.sa_family = AF_INET;
 799 #if IS_ENABLED(CONFIG_IPV6)
 800                 } else {
 801                         ip->sin6.sin6_addr = in6addr_any;
 802                         ip->sa.sa_family = AF_INET6;
 803 #endif
 804                 }
 805         }
 806
 807         if (tb[NDA_PORT]) {
 808                 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
 809                         return -EINVAL;
 810                 *port = nla_get_be16(tb[NDA_PORT]);
 811         } else {
 812                 *port = vxlan->cfg.dst_port;
 813         }
 814
 815         if (tb[NDA_VNI]) {
 816                 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
 817                         return -EINVAL;
 818                 *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
 819         } else {
 820                 *vni = vxlan->default_dst.remote_vni;
 821         }
 822
 823         if (tb[NDA_IFINDEX]) {
 824                 struct net_device *tdev;
 825
 826                 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
 827                         return -EINVAL;
 828                 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
 829                 tdev = __dev_get_by_index(net, *ifindex);
 830                 if (!tdev)
 831                         return -EADDRNOTAVAIL;
 832         } else {
 833                 *ifindex = 0;
 834         }
 835
 836         return 0;
 837 }
 838
 839 /* Add static entry (via netlink) */
 840 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 841                          struct net_device *dev,
 842                          const unsigned char *addr, u16 vid, u16 flags)
 843 {
 844         struct vxlan_dev *vxlan = netdev_priv(dev);
 845         /* struct net *net = dev_net(vxlan->dev); */
 846         union vxlan_addr ip;
 847         __be16 port;
 848         __be32 vni;
 849         u32 ifindex;
 850         int err;
 851
 852         if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
 853                 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
 854                         ndm->ndm_state);
 855                 return -EINVAL;
 856         }
 857
 858         if (tb[NDA_DST] == NULL)
 859                 return -EINVAL;
 860
 861         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
 862         if (err)
 863                 return err;
 864
 865         if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
 866                 return -EAFNOSUPPORT;
 867
 868         spin_lock_bh(&vxlan->hash_lock);
 869         err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
 870                                port, vni, ifindex, ndm->ndm_flags);
 871         spin_unlock_bh(&vxlan->hash_lock);
 872
 873         return err;
 874 }
 875
 876 /* Delete entry (via netlink) */
 877 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 878                             struct net_device *dev,
 879                             const unsigned char *addr, u16 vid)
 880 {
 881         struct vxlan_dev *vxlan = netdev_priv(dev);
 882         struct vxlan_fdb *f;
 883         struct vxlan_rdst *rd = NULL;
 884         union vxlan_addr ip;
 885         __be16 port;
 886         __be32 vni;
 887         u32 ifindex;
 888         int err;
 889
 890         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
 891         if (err)
 892                 return err;
 893
 894         err = -ENOENT;
 895
 896         spin_lock_bh(&vxlan->hash_lock);
 897         f = vxlan_find_mac(vxlan, addr);
 898         if (!f)
 899                 goto out;
 900
 901         if (!vxlan_addr_any(&ip)) {
 902                 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
 903                 if (!rd)
 904                         goto out;
 905         }
 906
 907         err = 0;
 908
 909         /* remove a destination if it's not the only one on the list,
 910          * otherwise destroy the fdb entry
 911          */
 912         if (rd && !list_is_singular(&f->remotes)) {
 913                 list_del_rcu(&rd->list);
 914                 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
 915                 kfree_rcu(rd, rcu);
 916                 goto out;
 917         }
 918
 919         vxlan_fdb_destroy(vxlan, f);
 920
 921 out:
 922         spin_unlock_bh(&vxlan->hash_lock);
 923
 924         return err;
 925 }
 926
 927 /* Dump forwarding table */
 928 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 929                           struct net_device *dev,
 930                           struct net_device *filter_dev, int idx)
 931 {
 932         struct vxlan_dev *vxlan = netdev_priv(dev);
 933         unsigned int h;
 934
 935         for (h = 0; h < FDB_HASH_SIZE; ++h) {
 936                 struct vxlan_fdb *f;
 937                 int err;
 938
 939                 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
 940                         struct vxlan_rdst *rd;
 941
 942                         list_for_each_entry_rcu(rd, &f->remotes, list) {
 943                                 if (idx < cb->args[0])
 944                                         goto skip;
 945
 946                                 err = vxlan_fdb_info(skb, vxlan, f,
 947                                                      NETLINK_CB(cb->skb).portid,
 948                                                      cb->nlh->nlmsg_seq,
 949                                                      RTM_NEWNEIGH,
 950                                                      NLM_F_MULTI, rd);
 951                                 if (err < 0) {
 952                                         cb->args[1] = err;
 953                                         goto out;
 954                                 }
 955 skip:
 956                                 ++idx;
 957                         }
 958                 }
 959         }
 960 out:
 961         return idx;
 962 }
 963
 964 /* Watch incoming packets to learn mapping between Ethernet address
 965  * and Tunnel endpoint.
 966  * Return true if packet is bogus and should be dropped.
 967  */
 968 static bool vxlan_snoop(struct net_device *dev,
 969                         union vxlan_addr *src_ip, const u8 *src_mac)
 970 {
 971         struct vxlan_dev *vxlan = netdev_priv(dev);
 972         struct vxlan_fdb *f;
 973
 974         f = vxlan_find_mac(vxlan, src_mac);
 975         if (likely(f)) {
 976                 struct vxlan_rdst *rdst = first_remote_rcu(f);
 977
 978                 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
 979                         return false;
 980
 981                 /* Don't migrate static entries, drop packets */
 982                 if (f->state & NUD_NOARP)
 983                         return true;
 984
 985                 if (net_ratelimit())
 986                         netdev_info(dev,
 987                                     "%pM migrated from %pIS to %pIS\n",
 988                                     src_mac, &rdst->remote_ip.sa, &src_ip->sa);
 989
 990                 rdst->remote_ip = *src_ip;
 991                 f->updated = jiffies;
 992                 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
 993         } else {
 994                 /* learned new entry */
 995                 spin_lock(&vxlan->hash_lock);
 996
 997                 /* close off race between vxlan_flush and incoming packets */
 998                 if (netif_running(dev))
 999                         vxlan_fdb_create(vxlan, src_mac, src_ip,
1000                                          NUD_REACHABLE,
1001                                          NLM_F_EXCL|NLM_F_CREATE,
1002                                          vxlan->cfg.dst_port,
1003                                          vxlan->default_dst.remote_vni,
1004                                          0, NTF_SELF);
1005                 spin_unlock(&vxlan->hash_lock);
1006         }
1007
1008         return false;
1009 }
1010
1011 /* See if multicast group is already in use by other ID */
1012 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
1013 {
1014         struct vxlan_dev *vxlan;
1015         unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
1016
1017         /* The vxlan_sock is only used by dev, leaving group has
1018          * no effect on other vxlan devices.
1019          */
1020         if (family == AF_INET && dev->vn4_sock &&
1021             atomic_read(&dev->vn4_sock->refcnt) == 1)
1022                 return false;
1023 #if IS_ENABLED(CONFIG_IPV6)
1024         if (family == AF_INET6 && dev->vn6_sock &&
1025             atomic_read(&dev->vn6_sock->refcnt) == 1)
1026                 return false;
1027 #endif
1028
1029         list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1030                 if (!netif_running(vxlan->dev) || vxlan == dev)
1031                         continue;
1032
1033                 if (family == AF_INET && vxlan->vn4_sock != dev->vn4_sock)
1034                         continue;
1035 #if IS_ENABLED(CONFIG_IPV6)
1036                 if (family == AF_INET6 && vxlan->vn6_sock != dev->vn6_sock)
1037                         continue;
1038 #endif
1039
1040                 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1041                                       &dev->default_dst.remote_ip))
1042                         continue;
1043
1044                 if (vxlan->default_dst.remote_ifindex !=
1045                     dev->default_dst.remote_ifindex)
1046                         continue;
1047
1048                 return true;
1049         }
1050
1051         return false;
1052 }
1053
1054 static void __vxlan_sock_release(struct vxlan_sock *vs)
1055 {
1056         struct vxlan_net *vn;
1057
1058         if (!vs)
1059                 return;
1060         if (!atomic_dec_and_test(&vs->refcnt))
1061                 return;
1062
1063         vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1064         spin_lock(&vn->sock_lock);
1065         hlist_del_rcu(&vs->hlist);
1066         vxlan_notify_del_rx_port(vs);
1067         spin_unlock(&vn->sock_lock);
1068
1069         queue_work(vxlan_wq, &vs->del_work);
1070 }
1071
1072 static void vxlan_sock_release(struct vxlan_dev *vxlan)
1073 {
1074         __vxlan_sock_release(vxlan->vn4_sock);
1075 #if IS_ENABLED(CONFIG_IPV6)
1076         __vxlan_sock_release(vxlan->vn6_sock);
1077 #endif
1078 }
1079
1080 /* Update multicast group membership when first VNI on
1081  * multicast address is brought up
1082  */
1083 static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1084 {
1085         struct sock *sk;
1086         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1087         int ifindex = vxlan->default_dst.remote_ifindex;
1088         int ret = -EINVAL;
1089
1090         if (ip->sa.sa_family == AF_INET) {
1091                 struct ip_mreqn mreq = {
1092                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1093                         .imr_ifindex            = ifindex,
1094                 };
1095
1096                 sk = vxlan->vn4_sock->sock->sk;
1097                 lock_sock(sk);
1098                 ret = ip_mc_join_group(sk, &mreq);
1099                 release_sock(sk);
1100 #if IS_ENABLED(CONFIG_IPV6)
1101         } else {
1102                 sk = vxlan->vn6_sock->sock->sk;
1103                 lock_sock(sk);
1104                 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1105                                                    &ip->sin6.sin6_addr);
1106                 release_sock(sk);
1107 #endif
1108         }
1109
1110         return ret;
1111 }
1112
1113 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1114 static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1115 {
1116         struct sock *sk;
1117         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1118         int ifindex = vxlan->default_dst.remote_ifindex;
1119         int ret = -EINVAL;
1120
1121         if (ip->sa.sa_family == AF_INET) {
1122                 struct ip_mreqn mreq = {
1123                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1124                         .imr_ifindex            = ifindex,
1125                 };
1126
1127                 sk = vxlan->vn4_sock->sock->sk;
1128                 lock_sock(sk);
1129                 ret = ip_mc_leave_group(sk, &mreq);
1130                 release_sock(sk);
1131 #if IS_ENABLED(CONFIG_IPV6)
1132         } else {
1133                 sk = vxlan->vn6_sock->sock->sk;
1134                 lock_sock(sk);
1135                 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1136                                                    &ip->sin6.sin6_addr);
1137                 release_sock(sk);
1138 #endif
1139         }
1140
1141         return ret;
1142 }
1143
1144 static bool vxlan_remcsum(struct vxlanhdr *unparsed,
1145                           struct sk_buff *skb, u32 vxflags)
1146 {
1147         size_t start, offset, plen;
1148
1149         if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
1150                 goto out;
1151
1152         start = vxlan_rco_start(unparsed->vx_vni);
1153         offset = start + vxlan_rco_offset(unparsed->vx_vni);
1154
1155         plen = sizeof(struct vxlanhdr) + offset + sizeof(u16);
1156
1157         if (!pskb_may_pull(skb, plen))
1158                 return false;
1159
1160         skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
1161                             !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL));
1162 out:
1163         unparsed->vx_flags &= ~VXLAN_HF_RCO;
1164         unparsed->vx_vni &= VXLAN_VNI_MASK;
1165         return true;
1166 }
1167
1168 static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
1169                                 struct sk_buff *skb, u32 vxflags,
1170                                 struct vxlan_metadata *md)
1171 {
1172         struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
1173         struct metadata_dst *tun_dst;
1174
1175         if (!(unparsed->vx_flags & VXLAN_HF_GBP))
1176                 goto out;
1177
1178         md->gbp = ntohs(gbp->policy_id);
1179
1180         tun_dst = (struct metadata_dst *)skb_dst(skb);
1181         if (tun_dst) {
1182                 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1183                 tun_dst->u.tun_info.options_len = sizeof(*md);
1184         }
1185         if (gbp->dont_learn)
1186                 md->gbp |= VXLAN_GBP_DONT_LEARN;
1187
1188         if (gbp->policy_applied)
1189                 md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1190
1191         /* In flow-based mode, GBP is carried in dst_metadata */
1192         if (!(vxflags & VXLAN_F_COLLECT_METADATA))
1193                 skb->mark = md->gbp;
1194 out:
1195         unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
1196 }
1197
1198 static bool vxlan_set_mac(struct vxlan_dev *vxlan,
1199                           struct vxlan_sock *vs,
1200                           struct sk_buff *skb)
1201 {
1202         union vxlan_addr saddr;
1203
1204         skb_reset_mac_header(skb);
1205         skb->protocol = eth_type_trans(skb, vxlan->dev);
1206         skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1207
1208         /* Ignore packet loops (and multicast echo) */
1209         if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1210                 return false;
1211
1212         /* Get address from the outer IP header */
1213         if (vxlan_get_sk_family(vs) == AF_INET) {
1214                 saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
1215                 saddr.sa.sa_family = AF_INET;
1216 #if IS_ENABLED(CONFIG_IPV6)
1217         } else {
1218                 saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
1219                 saddr.sa.sa_family = AF_INET6;
1220 #endif
1221         }
1222
1223         if ((vxlan->flags & VXLAN_F_LEARN) &&
1224             vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
1225                 return false;
1226
1227         return true;
1228 }
1229
1230 static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph,
1231                                   struct sk_buff *skb)
1232 {
1233         int err = 0;
1234
1235         if (vxlan_get_sk_family(vs) == AF_INET)
1236                 err = IP_ECN_decapsulate(oiph, skb);
1237 #if IS_ENABLED(CONFIG_IPV6)
1238         else
1239                 err = IP6_ECN_decapsulate(oiph, skb);
1240 #endif
1241
1242         if (unlikely(err) && log_ecn_error) {
1243                 if (vxlan_get_sk_family(vs) == AF_INET)
1244                         net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1245                                              &((struct iphdr *)oiph)->saddr,
1246                                              ((struct iphdr *)oiph)->tos);
1247                 else
1248                         net_info_ratelimited("non-ECT from %pI6\n",
1249                                              &((struct ipv6hdr *)oiph)->saddr);
1250         }
1251         return err <= 1;
1252 }
1253
1254 /* Callback from net/ipv4/udp.c to receive packets */
1255 static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
1256 {
1257         struct pcpu_sw_netstats *stats;
1258         struct vxlan_dev *vxlan;
1259         struct vxlan_sock *vs;
1260         struct vxlanhdr unparsed;
1261         struct vxlan_metadata _md;
1262         struct vxlan_metadata *md = &_md;
1263         void *oiph;
1264
1265         /* Need Vxlan and inner Ethernet header to be present */
1266         if (!pskb_may_pull(skb, VXLAN_HLEN))
1267                 return 1;
1268
1269         unparsed = *vxlan_hdr(skb);
1270         /* VNI flag always required to be set */
1271         if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
1272                 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1273                            ntohl(vxlan_hdr(skb)->vx_flags),
1274                            ntohl(vxlan_hdr(skb)->vx_vni));
1275                 /* Return non vxlan pkt */
1276                 return 1;
1277         }
1278         unparsed.vx_flags &= ~VXLAN_HF_VNI;
1279         unparsed.vx_vni &= ~VXLAN_VNI_MASK;
1280
1281         vs = rcu_dereference_sk_user_data(sk);
1282         if (!vs)
1283                 goto drop;
1284
1285         vxlan = vxlan_vs_find_vni(vs, vxlan_vni(vxlan_hdr(skb)->vx_vni));
1286         if (!vxlan)
1287                 goto drop;
1288
1289         if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB),
1290                                  !net_eq(vxlan->net, dev_net(vxlan->dev))))
1291                 goto drop;
1292
1293         if (vxlan_collect_metadata(vs)) {
1294                 __be32 vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
1295                 struct metadata_dst *tun_dst;
1296
1297                 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1298                                          vxlan_vni_to_tun_id(vni), sizeof(*md));
1299
1300                 if (!tun_dst)
1301                         goto drop;
1302
1303                 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1304
1305                 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1306         } else {
1307                 memset(md, 0, sizeof(*md));
1308         }
1309
1310         /* For backwards compatibility, only allow reserved fields to be
1311          * used by VXLAN extensions if explicitly requested.
1312          */
1313         if (vs->flags & VXLAN_F_REMCSUM_RX)
1314                 if (!vxlan_remcsum(&unparsed, skb, vs->flags))
1315                         goto drop;
1316         if (vs->flags & VXLAN_F_GBP)
1317                 vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md);
1318
1319         if (unparsed.vx_flags || unparsed.vx_vni) {
1320                 /* If there are any unprocessed flags remaining treat
1321                  * this as a malformed packet. This behavior diverges from
1322                  * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1323                  * in reserved fields are to be ignored. The approach here
1324                  * maintains compatibility with previous stack code, and also
1325                  * is more robust and provides a little more security in
1326                  * adding extensions to VXLAN.
1327                  */
1328                 goto drop;
1329         }
1330
1331         if (!vxlan_set_mac(vxlan, vs, skb))
1332                 goto drop;
1333
1334         oiph = skb_network_header(skb);
1335         skb_reset_network_header(skb);
1336
1337         if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
1338                 ++vxlan->dev->stats.rx_frame_errors;
1339                 ++vxlan->dev->stats.rx_errors;
1340                 goto drop;
1341         }
1342
1343         stats = this_cpu_ptr(vxlan->dev->tstats);
1344         u64_stats_update_begin(&stats->syncp);
1345         stats->rx_packets++;
1346         stats->rx_bytes += skb->len;
1347         u64_stats_update_end(&stats->syncp);
1348
1349         gro_cells_receive(&vxlan->gro_cells, skb);
1350         return 0;
1351
1352 drop:
1353         /* Consume bad packet */
1354         kfree_skb(skb);
1355         return 0;
1356 }
1357
1358 static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1359 {
1360         struct vxlan_dev *vxlan = netdev_priv(dev);
1361         struct arphdr *parp;
1362         u8 *arpptr, *sha;
1363         __be32 sip, tip;
1364         struct neighbour *n;
1365
1366         if (dev->flags & IFF_NOARP)
1367                 goto out;
1368
1369         if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1370                 dev->stats.tx_dropped++;
1371                 goto out;
1372         }
1373         parp = arp_hdr(skb);
1374
1375         if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1376              parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1377             parp->ar_pro != htons(ETH_P_IP) ||
1378             parp->ar_op != htons(ARPOP_REQUEST) ||
1379             parp->ar_hln != dev->addr_len ||
1380             parp->ar_pln != 4)
1381                 goto out;
1382         arpptr = (u8 *)parp + sizeof(struct arphdr);
1383         sha = arpptr;
1384         arpptr += dev->addr_len;        /* sha */
1385         memcpy(&sip, arpptr, sizeof(sip));
1386         arpptr += sizeof(sip);
1387         arpptr += dev->addr_len;        /* tha */
1388         memcpy(&tip, arpptr, sizeof(tip));
1389
1390         if (ipv4_is_loopback(tip) ||
1391             ipv4_is_multicast(tip))
1392                 goto out;
1393
1394         n = neigh_lookup(&arp_tbl, &tip, dev);
1395
1396         if (n) {
1397                 struct vxlan_fdb *f;
1398                 struct sk_buff  *reply;
1399
1400                 if (!(n->nud_state & NUD_CONNECTED)) {
1401                         neigh_release(n);
1402                         goto out;
1403                 }
1404
1405                 f = vxlan_find_mac(vxlan, n->ha);
1406                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1407                         /* bridge-local neighbor */
1408                         neigh_release(n);
1409                         goto out;
1410                 }
1411
1412                 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1413                                 n->ha, sha);
1414
1415                 neigh_release(n);
1416
1417                 if (reply == NULL)
1418                         goto out;
1419
1420                 skb_reset_mac_header(reply);
1421                 __skb_pull(reply, skb_network_offset(reply));
1422                 reply->ip_summed = CHECKSUM_UNNECESSARY;
1423                 reply->pkt_type = PACKET_HOST;
1424
1425                 if (netif_rx_ni(reply) == NET_RX_DROP)
1426                         dev->stats.rx_dropped++;
1427         } else if (vxlan->flags & VXLAN_F_L3MISS) {
1428                 union vxlan_addr ipa = {
1429                         .sin.sin_addr.s_addr = tip,
1430                         .sin.sin_family = AF_INET,
1431                 };
1432
1433                 vxlan_ip_miss(dev, &ipa);
1434         }
1435 out:
1436         consume_skb(skb);
1437         return NETDEV_TX_OK;
1438 }
1439
1440 #if IS_ENABLED(CONFIG_IPV6)
1441 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1442         struct neighbour *n, bool isrouter)
1443 {
1444         struct net_device *dev = request->dev;
1445         struct sk_buff *reply;
1446         struct nd_msg *ns, *na;
1447         struct ipv6hdr *pip6;
1448         u8 *daddr;
1449         int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1450         int ns_olen;
1451         int i, len;
1452
1453         if (dev == NULL)
1454                 return NULL;
1455
1456         len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1457                 sizeof(*na) + na_olen + dev->needed_tailroom;
1458         reply = alloc_skb(len, GFP_ATOMIC);
1459         if (reply == NULL)
1460                 return NULL;
1461
1462         reply->protocol = htons(ETH_P_IPV6);
1463         reply->dev = dev;
1464         skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1465         skb_push(reply, sizeof(struct ethhdr));
1466         skb_reset_mac_header(reply);
1467
1468         ns = (struct nd_msg *)skb_transport_header(request);
1469
1470         daddr = eth_hdr(request)->h_source;
1471         ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
1472         for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1473                 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1474                         daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1475                         break;
1476                 }
1477         }
1478
1479         /* Ethernet header */
1480         ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1481         ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1482         eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1483         reply->protocol = htons(ETH_P_IPV6);
1484
1485         skb_pull(reply, sizeof(struct ethhdr));
1486         skb_reset_network_header(reply);
1487         skb_put(reply, sizeof(struct ipv6hdr));
1488
1489         /* IPv6 header */
1490
1491         pip6 = ipv6_hdr(reply);
1492         memset(pip6, 0, sizeof(struct ipv6hdr));
1493         pip6->version = 6;
1494         pip6->priority = ipv6_hdr(request)->priority;
1495         pip6->nexthdr = IPPROTO_ICMPV6;
1496         pip6->hop_limit = 255;
1497         pip6->daddr = ipv6_hdr(request)->saddr;
1498         pip6->saddr = *(struct in6_addr *)n->primary_key;
1499
1500         skb_pull(reply, sizeof(struct ipv6hdr));
1501         skb_reset_transport_header(reply);
1502
1503         na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1504
1505         /* Neighbor Advertisement */
1506         memset(na, 0, sizeof(*na)+na_olen);
1507         na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1508         na->icmph.icmp6_router = isrouter;
1509         na->icmph.icmp6_override = 1;
1510         na->icmph.icmp6_solicited = 1;
1511         na->target = ns->target;
1512         ether_addr_copy(&na->opt[2], n->ha);
1513         na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1514         na->opt[1] = na_olen >> 3;
1515
1516         na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1517                 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1518                 csum_partial(na, sizeof(*na)+na_olen, 0));
1519
1520         pip6->payload_len = htons(sizeof(*na)+na_olen);
1521
1522         skb_push(reply, sizeof(struct ipv6hdr));
1523
1524         reply->ip_summed = CHECKSUM_UNNECESSARY;
1525
1526         return reply;
1527 }
1528
1529 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1530 {
1531         struct vxlan_dev *vxlan = netdev_priv(dev);
1532         struct nd_msg *msg;
1533         const struct ipv6hdr *iphdr;
1534         const struct in6_addr *saddr, *daddr;
1535         struct neighbour *n;
1536         struct inet6_dev *in6_dev;
1537
1538         in6_dev = __in6_dev_get(dev);
1539         if (!in6_dev)
1540                 goto out;
1541
1542         iphdr = ipv6_hdr(skb);
1543         saddr = &iphdr->saddr;
1544         daddr = &iphdr->daddr;
1545
1546         msg = (struct nd_msg *)skb_transport_header(skb);
1547         if (msg->icmph.icmp6_code != 0 ||
1548             msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1549                 goto out;
1550
1551         if (ipv6_addr_loopback(daddr) ||
1552             ipv6_addr_is_multicast(&msg->target))
1553                 goto out;
1554
1555         n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1556
1557         if (n) {
1558                 struct vxlan_fdb *f;
1559                 struct sk_buff *reply;
1560
1561                 if (!(n->nud_state & NUD_CONNECTED)) {
1562                         neigh_release(n);
1563                         goto out;
1564                 }
1565
1566                 f = vxlan_find_mac(vxlan, n->ha);
1567                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1568                         /* bridge-local neighbor */
1569                         neigh_release(n);
1570                         goto out;
1571                 }
1572
1573                 reply = vxlan_na_create(skb, n,
1574                                         !!(f ? f->flags & NTF_ROUTER : 0));
1575
1576                 neigh_release(n);
1577
1578                 if (reply == NULL)
1579                         goto out;
1580
1581                 if (netif_rx_ni(reply) == NET_RX_DROP)
1582                         dev->stats.rx_dropped++;
1583
1584         } else if (vxlan->flags & VXLAN_F_L3MISS) {
1585                 union vxlan_addr ipa = {
1586                         .sin6.sin6_addr = msg->target,
1587                         .sin6.sin6_family = AF_INET6,
1588                 };
1589
1590                 vxlan_ip_miss(dev, &ipa);
1591         }
1592
1593 out:
1594         consume_skb(skb);
1595         return NETDEV_TX_OK;
1596 }
1597 #endif
1598
1599 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1600 {
1601         struct vxlan_dev *vxlan = netdev_priv(dev);
1602         struct neighbour *n;
1603
1604         if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1605                 return false;
1606
1607         n = NULL;
1608         switch (ntohs(eth_hdr(skb)->h_proto)) {
1609         case ETH_P_IP:
1610         {
1611                 struct iphdr *pip;
1612
1613                 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1614                         return false;
1615                 pip = ip_hdr(skb);
1616                 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1617                 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1618                         union vxlan_addr ipa = {
1619                                 .sin.sin_addr.s_addr = pip->daddr,
1620                                 .sin.sin_family = AF_INET,
1621                         };
1622
1623                         vxlan_ip_miss(dev, &ipa);
1624                         return false;
1625                 }
1626
1627                 break;
1628         }
1629 #if IS_ENABLED(CONFIG_IPV6)
1630         case ETH_P_IPV6:
1631         {
1632                 struct ipv6hdr *pip6;
1633
1634                 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1635                         return false;
1636                 pip6 = ipv6_hdr(skb);
1637                 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1638                 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1639                         union vxlan_addr ipa = {
1640                                 .sin6.sin6_addr = pip6->daddr,
1641                                 .sin6.sin6_family = AF_INET6,
1642                         };
1643
1644                         vxlan_ip_miss(dev, &ipa);
1645                         return false;
1646                 }
1647
1648                 break;
1649         }
1650 #endif
1651         default:
1652                 return false;
1653         }
1654
1655         if (n) {
1656                 bool diff;
1657
1658                 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1659                 if (diff) {
1660                         memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1661                                 dev->addr_len);
1662                         memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1663                 }
1664                 neigh_release(n);
1665                 return diff;
1666         }
1667
1668         return false;
1669 }
1670
1671 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
1672                                 struct vxlan_metadata *md)
1673 {
1674         struct vxlanhdr_gbp *gbp;
1675
1676         if (!md->gbp)
1677                 return;
1678
1679         gbp = (struct vxlanhdr_gbp *)vxh;
1680         vxh->vx_flags |= VXLAN_HF_GBP;
1681
1682         if (md->gbp & VXLAN_GBP_DONT_LEARN)
1683                 gbp->dont_learn = 1;
1684
1685         if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1686                 gbp->policy_applied = 1;
1687
1688         gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1689 }
1690
1691 static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
1692                            int iphdr_len, __be32 vni,
1693                            struct vxlan_metadata *md, u32 vxflags,
1694                            bool udp_sum)
1695 {
1696         struct vxlanhdr *vxh;
1697         int min_headroom;
1698         int err;
1699         int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1700
1701         if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1702             skb->ip_summed == CHECKSUM_PARTIAL) {
1703                 int csum_start = skb_checksum_start_offset(skb);
1704
1705                 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1706                     !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1707                     (skb->csum_offset == offsetof(struct udphdr, check) ||
1708                      skb->csum_offset == offsetof(struct tcphdr, check)))
1709                         type |= SKB_GSO_TUNNEL_REMCSUM;
1710         }
1711
1712         min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1713                         + VXLAN_HLEN + iphdr_len
1714                         + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1715
1716         /* Need space for new headers (invalidates iph ptr) */
1717         err = skb_cow_head(skb, min_headroom);
1718         if (unlikely(err)) {
1719                 kfree_skb(skb);
1720                 return err;
1721         }
1722
1723         skb = vlan_hwaccel_push_inside(skb);
1724         if (WARN_ON(!skb))
1725                 return -ENOMEM;
1726
1727         skb = iptunnel_handle_offloads(skb, type);
1728         if (IS_ERR(skb))
1729                 return PTR_ERR(skb);
1730
1731         vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1732         vxh->vx_flags = VXLAN_HF_VNI;
1733         vxh->vx_vni = vxlan_vni_field(vni);
1734
1735         if (type & SKB_GSO_TUNNEL_REMCSUM) {
1736                 unsigned int start;
1737
1738                 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
1739                 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
1740                 vxh->vx_flags |= VXLAN_HF_RCO;
1741
1742                 if (!skb_is_gso(skb)) {
1743                         skb->ip_summed = CHECKSUM_NONE;
1744                         skb->encapsulation = 0;
1745                 }
1746         }
1747
1748         if (vxflags & VXLAN_F_GBP)
1749                 vxlan_build_gbp_hdr(vxh, vxflags, md);
1750
1751         skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1752         return 0;
1753 }
1754
1755 static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan,
1756                                       struct sk_buff *skb, int oif, u8 tos,
1757                                       __be32 daddr, __be32 *saddr,
1758                                       struct dst_cache *dst_cache,
1759                                       const struct ip_tunnel_info *info)
1760 {
1761         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
1762         struct rtable *rt = NULL;
1763         struct flowi4 fl4;
1764
1765         if (tos && !info)
1766                 use_cache = false;
1767         if (use_cache) {
1768                 rt = dst_cache_get_ip4(dst_cache, saddr);
1769                 if (rt)
1770                         return rt;
1771         }
1772
1773         memset(&fl4, 0, sizeof(fl4));
1774         fl4.flowi4_oif = oif;
1775         fl4.flowi4_tos = RT_TOS(tos);
1776         fl4.flowi4_mark = skb->mark;
1777         fl4.flowi4_proto = IPPROTO_UDP;
1778         fl4.daddr = daddr;
1779         fl4.saddr = vxlan->cfg.saddr.sin.sin_addr.s_addr;
1780
1781         rt = ip_route_output_key(vxlan->net, &fl4);
1782         if (!IS_ERR(rt)) {
1783                 *saddr = fl4.saddr;
1784                 if (use_cache)
1785                         dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
1786         }
1787         return rt;
1788 }
1789
1790 #if IS_ENABLED(CONFIG_IPV6)
1791 static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
1792                                           struct sk_buff *skb, int oif, u8 tos,
1793                                           __be32 label,
1794                                           const struct in6_addr *daddr,
1795                                           struct in6_addr *saddr,
1796                                           struct dst_cache *dst_cache,
1797                                           const struct ip_tunnel_info *info)
1798 {
1799         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
1800         struct dst_entry *ndst;
1801         struct flowi6 fl6;
1802         int err;
1803
1804         if (tos && !info)
1805                 use_cache = false;
1806         if (use_cache) {
1807                 ndst = dst_cache_get_ip6(dst_cache, saddr);
1808                 if (ndst)
1809                         return ndst;
1810         }
1811
1812         memset(&fl6, 0, sizeof(fl6));
1813         fl6.flowi6_oif = oif;
1814         fl6.flowi6_tos = RT_TOS(tos);
1815         fl6.daddr = *daddr;
1816         fl6.saddr = vxlan->cfg.saddr.sin6.sin6_addr;
1817         fl6.flowlabel = label;
1818         fl6.flowi6_mark = skb->mark;
1819         fl6.flowi6_proto = IPPROTO_UDP;
1820
1821         err = ipv6_stub->ipv6_dst_lookup(vxlan->net,
1822                                          vxlan->vn6_sock->sock->sk,
1823                                          &ndst, &fl6);
1824         if (err < 0)
1825                 return ERR_PTR(err);
1826
1827         *saddr = fl6.saddr;
1828         if (use_cache)
1829                 dst_cache_set_ip6(dst_cache, ndst, saddr);
1830         return ndst;
1831 }
1832 #endif
1833
1834 /* Bypass encapsulation if the destination is local */
1835 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1836                                struct vxlan_dev *dst_vxlan)
1837 {
1838         struct pcpu_sw_netstats *tx_stats, *rx_stats;
1839         union vxlan_addr loopback;
1840         union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1841         struct net_device *dev = skb->dev;
1842         int len = skb->len;
1843
1844         tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1845         rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1846         skb->pkt_type = PACKET_HOST;
1847         skb->encapsulation = 0;
1848         skb->dev = dst_vxlan->dev;
1849         __skb_pull(skb, skb_network_offset(skb));
1850
1851         if (remote_ip->sa.sa_family == AF_INET) {
1852                 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1853                 loopback.sa.sa_family =  AF_INET;
1854 #if IS_ENABLED(CONFIG_IPV6)
1855         } else {
1856                 loopback.sin6.sin6_addr = in6addr_loopback;
1857                 loopback.sa.sa_family =  AF_INET6;
1858 #endif
1859         }
1860
1861         if (dst_vxlan->flags & VXLAN_F_LEARN)
1862                 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
1863
1864         u64_stats_update_begin(&tx_stats->syncp);
1865         tx_stats->tx_packets++;
1866         tx_stats->tx_bytes += len;
1867         u64_stats_update_end(&tx_stats->syncp);
1868
1869         if (netif_rx(skb) == NET_RX_SUCCESS) {
1870                 u64_stats_update_begin(&rx_stats->syncp);
1871                 rx_stats->rx_packets++;
1872                 rx_stats->rx_bytes += len;
1873                 u64_stats_update_end(&rx_stats->syncp);
1874         } else {
1875                 dev->stats.rx_dropped++;
1876         }
1877 }
1878
1879 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1880                            struct vxlan_rdst *rdst, bool did_rsc)
1881 {
1882         struct dst_cache *dst_cache;
1883         struct ip_tunnel_info *info;
1884         struct vxlan_dev *vxlan = netdev_priv(dev);
1885         struct sock *sk;
1886         struct rtable *rt = NULL;
1887         const struct iphdr *old_iph;
1888         union vxlan_addr *dst;
1889         union vxlan_addr remote_ip;
1890         struct vxlan_metadata _md;
1891         struct vxlan_metadata *md = &_md;
1892         __be16 src_port = 0, dst_port;
1893         __be32 vni, label;
1894         __be16 df = 0;
1895         __u8 tos, ttl;
1896         int err;
1897         u32 flags = vxlan->flags;
1898         bool udp_sum = false;
1899         bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
1900
1901         info = skb_tunnel_info(skb);
1902
1903         if (rdst) {
1904                 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
1905                 vni = rdst->remote_vni;
1906                 dst = &rdst->remote_ip;
1907                 dst_cache = &rdst->dst_cache;
1908         } else {
1909                 if (!info) {
1910                         WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
1911                                   dev->name);
1912                         goto drop;
1913                 }
1914                 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
1915                 vni = vxlan_tun_id_to_vni(info->key.tun_id);
1916                 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
1917                 if (remote_ip.sa.sa_family == AF_INET)
1918                         remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
1919                 else
1920                         remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
1921                 dst = &remote_ip;
1922                 dst_cache = &info->dst_cache;
1923         }
1924
1925         if (vxlan_addr_any(dst)) {
1926                 if (did_rsc) {
1927                         /* short-circuited back to local bridge */
1928                         vxlan_encap_bypass(skb, vxlan, vxlan);
1929                         return;
1930                 }
1931                 goto drop;
1932         }
1933
1934         old_iph = ip_hdr(skb);
1935
1936         ttl = vxlan->cfg.ttl;
1937         if (!ttl && vxlan_addr_multicast(dst))
1938                 ttl = 1;
1939
1940         tos = vxlan->cfg.tos;
1941         if (tos == 1)
1942                 tos = ip_tunnel_get_dsfield(old_iph, skb);
1943
1944         label = vxlan->cfg.label;
1945         src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
1946                                      vxlan->cfg.port_max, true);
1947
1948         if (info) {
1949                 ttl = info->key.ttl;
1950                 tos = info->key.tos;
1951                 label = info->key.label;
1952                 udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
1953
1954                 if (info->options_len)
1955                         md = ip_tunnel_info_opts(info);
1956         } else {
1957                 md->gbp = skb->mark;
1958         }
1959
1960         if (dst->sa.sa_family == AF_INET) {
1961                 __be32 saddr;
1962
1963                 if (!vxlan->vn4_sock)
1964                         goto drop;
1965                 sk = vxlan->vn4_sock->sock->sk;
1966
1967                 rt = vxlan_get_route(vxlan, skb,
1968                                      rdst ? rdst->remote_ifindex : 0, tos,
1969                                      dst->sin.sin_addr.s_addr, &saddr,
1970                                      dst_cache, info);
1971                 if (IS_ERR(rt)) {
1972                         netdev_dbg(dev, "no route to %pI4\n",
1973                                    &dst->sin.sin_addr.s_addr);
1974                         dev->stats.tx_carrier_errors++;
1975                         goto tx_error;
1976                 }
1977
1978                 if (rt->dst.dev == dev) {
1979                         netdev_dbg(dev, "circular route to %pI4\n",
1980                                    &dst->sin.sin_addr.s_addr);
1981                         dev->stats.collisions++;
1982                         goto rt_tx_error;
1983                 }
1984
1985                 /* Bypass encapsulation if the destination is local */
1986                 if (rt->rt_flags & RTCF_LOCAL &&
1987                     !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1988                         struct vxlan_dev *dst_vxlan;
1989
1990                         ip_rt_put(rt);
1991                         dst_vxlan = vxlan_find_vni(vxlan->net, vni,
1992                                                    dst->sa.sa_family, dst_port,
1993                                                    vxlan->flags);
1994                         if (!dst_vxlan)
1995                                 goto tx_error;
1996                         vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1997                         return;
1998                 }
1999
2000                 if (!info)
2001                         udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
2002                 else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT)
2003                         df = htons(IP_DF);
2004
2005                 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2006                 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2007                 err = vxlan_build_skb(skb, &rt->dst, sizeof(struct iphdr),
2008                                       vni, md, flags, udp_sum);
2009                 if (err < 0)
2010                         goto xmit_tx_error;
2011
2012                 udp_tunnel_xmit_skb(rt, sk, skb, saddr,
2013                                     dst->sin.sin_addr.s_addr, tos, ttl, df,
2014                                     src_port, dst_port, xnet, !udp_sum);
2015 #if IS_ENABLED(CONFIG_IPV6)
2016         } else {
2017                 struct dst_entry *ndst;
2018                 struct in6_addr saddr;
2019                 u32 rt6i_flags;
2020
2021                 if (!vxlan->vn6_sock)
2022                         goto drop;
2023                 sk = vxlan->vn6_sock->sock->sk;
2024
2025                 ndst = vxlan6_get_route(vxlan, skb,
2026                                         rdst ? rdst->remote_ifindex : 0, tos,
2027                                         label, &dst->sin6.sin6_addr, &saddr,
2028                                         dst_cache, info);
2029                 if (IS_ERR(ndst)) {
2030                         netdev_dbg(dev, "no route to %pI6\n",
2031                                    &dst->sin6.sin6_addr);
2032                         dev->stats.tx_carrier_errors++;
2033                         goto tx_error;
2034                 }
2035
2036                 if (ndst->dev == dev) {
2037                         netdev_dbg(dev, "circular route to %pI6\n",
2038                                    &dst->sin6.sin6_addr);
2039                         dst_release(ndst);
2040                         dev->stats.collisions++;
2041                         goto tx_error;
2042                 }
2043
2044                 /* Bypass encapsulation if the destination is local */
2045                 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2046                 if (rt6i_flags & RTF_LOCAL &&
2047                     !(rt6i_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2048                         struct vxlan_dev *dst_vxlan;
2049
2050                         dst_release(ndst);
2051                         dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2052                                                    dst->sa.sa_family, dst_port,
2053                                                    vxlan->flags);
2054                         if (!dst_vxlan)
2055                                 goto tx_error;
2056                         vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2057                         return;
2058                 }
2059
2060                 if (!info)
2061                         udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2062
2063                 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2064                 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2065                 skb_scrub_packet(skb, xnet);
2066                 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
2067                                       vni, md, flags, udp_sum);
2068                 if (err < 0) {
2069                         dst_release(ndst);
2070                         return;
2071                 }
2072                 udp_tunnel6_xmit_skb(ndst, sk, skb, dev,
2073                                      &saddr, &dst->sin6.sin6_addr, tos, ttl,
2074                                      label, src_port, dst_port, !udp_sum);
2075 #endif
2076         }
2077
2078         return;
2079
2080 drop:
2081         dev->stats.tx_dropped++;
2082         goto tx_free;
2083
2084 xmit_tx_error:
2085         /* skb is already freed. */
2086         skb = NULL;
2087 rt_tx_error:
2088         ip_rt_put(rt);
2089 tx_error:
2090         dev->stats.tx_errors++;
2091 tx_free:
2092         dev_kfree_skb(skb);
2093 }
2094
2095 /* Transmit local packets over Vxlan
2096  *
2097  * Outer IP header inherits ECN and DF from inner header.
2098  * Outer UDP destination is the VXLAN assigned port.
2099  *           source port is based on hash of flow
2100  */
2101 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2102 {
2103         struct vxlan_dev *vxlan = netdev_priv(dev);
2104         const struct ip_tunnel_info *info;
2105         struct ethhdr *eth;
2106         bool did_rsc = false;
2107         struct vxlan_rdst *rdst, *fdst = NULL;
2108         struct vxlan_fdb *f;
2109
2110         info = skb_tunnel_info(skb);
2111
2112         skb_reset_mac_header(skb);
2113         eth = eth_hdr(skb);
2114
2115         if ((vxlan->flags & VXLAN_F_PROXY)) {
2116                 if (ntohs(eth->h_proto) == ETH_P_ARP)
2117                         return arp_reduce(dev, skb);
2118 #if IS_ENABLED(CONFIG_IPV6)
2119                 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2120                          pskb_may_pull(skb, sizeof(struct ipv6hdr)
2121                                        + sizeof(struct nd_msg)) &&
2122                          ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2123                                 struct nd_msg *msg;
2124
2125                                 msg = (struct nd_msg *)skb_transport_header(skb);
2126                                 if (msg->icmph.icmp6_code == 0 &&
2127                                     msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2128                                         return neigh_reduce(dev, skb);
2129                 }
2130                 eth = eth_hdr(skb);
2131 #endif
2132         }
2133
2134         if (vxlan->flags & VXLAN_F_COLLECT_METADATA) {
2135                 if (info && info->mode & IP_TUNNEL_INFO_TX)
2136                         vxlan_xmit_one(skb, dev, NULL, false);
2137                 else
2138                         kfree_skb(skb);
2139                 return NETDEV_TX_OK;
2140         }
2141
2142         f = vxlan_find_mac(vxlan, eth->h_dest);
2143         did_rsc = false;
2144
2145         if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
2146             (ntohs(eth->h_proto) == ETH_P_IP ||
2147              ntohs(eth->h_proto) == ETH_P_IPV6)) {
2148                 did_rsc = route_shortcircuit(dev, skb);
2149                 if (did_rsc)
2150                         f = vxlan_find_mac(vxlan, eth->h_dest);
2151         }
2152
2153         if (f == NULL) {
2154                 f = vxlan_find_mac(vxlan, all_zeros_mac);
2155                 if (f == NULL) {
2156                         if ((vxlan->flags & VXLAN_F_L2MISS) &&
2157                             !is_multicast_ether_addr(eth->h_dest))
2158                                 vxlan_fdb_miss(vxlan, eth->h_dest);
2159
2160                         dev->stats.tx_dropped++;
2161                         kfree_skb(skb);
2162                         return NETDEV_TX_OK;
2163                 }
2164         }
2165
2166         list_for_each_entry_rcu(rdst, &f->remotes, list) {
2167                 struct sk_buff *skb1;
2168
2169                 if (!fdst) {
2170                         fdst = rdst;
2171                         continue;
2172                 }
2173                 skb1 = skb_clone(skb, GFP_ATOMIC);
2174                 if (skb1)
2175                         vxlan_xmit_one(skb1, dev, rdst, did_rsc);
2176         }
2177
2178         if (fdst)
2179                 vxlan_xmit_one(skb, dev, fdst, did_rsc);
2180         else
2181                 kfree_skb(skb);
2182         return NETDEV_TX_OK;
2183 }
2184
2185 /* Walk the forwarding table and purge stale entries */
2186 static void vxlan_cleanup(unsigned long arg)
2187 {
2188         struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
2189         unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2190         unsigned int h;
2191
2192         if (!netif_running(vxlan->dev))
2193                 return;
2194
2195         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2196                 struct hlist_node *p, *n;
2197
2198                 spin_lock_bh(&vxlan->hash_lock);
2199                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2200                         struct vxlan_fdb *f
2201                                 = container_of(p, struct vxlan_fdb, hlist);
2202                         unsigned long timeout;
2203
2204                         if (f->state & NUD_PERMANENT)
2205                                 continue;
2206
2207                         timeout = f->used + vxlan->cfg.age_interval * HZ;
2208                         if (time_before_eq(timeout, jiffies)) {
2209                                 netdev_dbg(vxlan->dev,
2210                                            "garbage collect %pM\n",
2211                                            f->eth_addr);
2212                                 f->state = NUD_STALE;
2213                                 vxlan_fdb_destroy(vxlan, f);
2214                         } else if (time_before(timeout, next_timer))
2215                                 next_timer = timeout;
2216                 }
2217                 spin_unlock_bh(&vxlan->hash_lock);
2218         }
2219
2220         mod_timer(&vxlan->age_timer, next_timer);
2221 }
2222
2223 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
2224 {
2225         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2226         __be32 vni = vxlan->default_dst.remote_vni;
2227
2228         spin_lock(&vn->sock_lock);
2229         hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
2230         spin_unlock(&vn->sock_lock);
2231 }
2232
2233 /* Setup stats when device is created */
2234 static int vxlan_init(struct net_device *dev)
2235 {
2236         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2237         if (!dev->tstats)
2238                 return -ENOMEM;
2239
2240         return 0;
2241 }
2242
2243 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
2244 {
2245         struct vxlan_fdb *f;
2246
2247         spin_lock_bh(&vxlan->hash_lock);
2248         f = __vxlan_find_mac(vxlan, all_zeros_mac);
2249         if (f)
2250                 vxlan_fdb_destroy(vxlan, f);
2251         spin_unlock_bh(&vxlan->hash_lock);
2252 }
2253
2254 static void vxlan_uninit(struct net_device *dev)
2255 {
2256         struct vxlan_dev *vxlan = netdev_priv(dev);
2257
2258         vxlan_fdb_delete_default(vxlan);
2259
2260         free_percpu(dev->tstats);
2261 }
2262
2263 /* Start ageing timer and join group when device is brought up */
2264 static int vxlan_open(struct net_device *dev)
2265 {
2266         struct vxlan_dev *vxlan = netdev_priv(dev);
2267         int ret;
2268
2269         ret = vxlan_sock_add(vxlan);
2270         if (ret < 0)
2271                 return ret;
2272
2273         if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2274                 ret = vxlan_igmp_join(vxlan);
2275                 if (ret == -EADDRINUSE)
2276                         ret = 0;
2277                 if (ret) {
2278                         vxlan_sock_release(vxlan);
2279                         return ret;
2280                 }
2281         }
2282
2283         if (vxlan->cfg.age_interval)
2284                 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2285
2286         return ret;
2287 }
2288
2289 /* Purge the forwarding table */
2290 static void vxlan_flush(struct vxlan_dev *vxlan)
2291 {
2292         unsigned int h;
2293
2294         spin_lock_bh(&vxlan->hash_lock);
2295         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2296                 struct hlist_node *p, *n;
2297                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2298                         struct vxlan_fdb *f
2299                                 = container_of(p, struct vxlan_fdb, hlist);
2300                         /* the all_zeros_mac entry is deleted at vxlan_uninit */
2301                         if (!is_zero_ether_addr(f->eth_addr))
2302                                 vxlan_fdb_destroy(vxlan, f);
2303                 }
2304         }
2305         spin_unlock_bh(&vxlan->hash_lock);
2306 }
2307
2308 /* Cleanup timer and forwarding table on shutdown */
2309 static int vxlan_stop(struct net_device *dev)
2310 {
2311         struct vxlan_dev *vxlan = netdev_priv(dev);
2312         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2313         int ret = 0;
2314
2315         if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2316             !vxlan_group_used(vn, vxlan))
2317                 ret = vxlan_igmp_leave(vxlan);
2318
2319         del_timer_sync(&vxlan->age_timer);
2320
2321         vxlan_flush(vxlan);
2322         vxlan_sock_release(vxlan);
2323
2324         return ret;
2325 }
2326
2327 /* Stub, nothing needs to be done. */
2328 static void vxlan_set_multicast_list(struct net_device *dev)
2329 {
2330 }
2331
2332 static int __vxlan_change_mtu(struct net_device *dev,
2333                               struct net_device *lowerdev,
2334                               struct vxlan_rdst *dst, int new_mtu, bool strict)
2335 {
2336         int max_mtu = IP_MAX_MTU;
2337
2338         if (lowerdev)
2339                 max_mtu = lowerdev->mtu;
2340
2341         if (dst->remote_ip.sa.sa_family == AF_INET6)
2342                 max_mtu -= VXLAN6_HEADROOM;
2343         else
2344                 max_mtu -= VXLAN_HEADROOM;
2345
2346         if (new_mtu < 68)
2347                 return -EINVAL;
2348
2349         if (new_mtu > max_mtu) {
2350                 if (strict)
2351                         return -EINVAL;
2352
2353                 new_mtu = max_mtu;
2354         }
2355
2356         dev->mtu = new_mtu;
2357         return 0;
2358 }
2359
2360 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2361 {
2362         struct vxlan_dev *vxlan = netdev_priv(dev);
2363         struct vxlan_rdst *dst = &vxlan->default_dst;
2364         struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
2365                                                          dst->remote_ifindex);
2366         return __vxlan_change_mtu(dev, lowerdev, dst, new_mtu, true);
2367 }
2368
2369 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
2370 {
2371         struct vxlan_dev *vxlan = netdev_priv(dev);
2372         struct ip_tunnel_info *info = skb_tunnel_info(skb);
2373         __be16 sport, dport;
2374
2375         sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2376                                   vxlan->cfg.port_max, true);
2377         dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
2378
2379         if (ip_tunnel_info_af(info) == AF_INET) {
2380                 struct rtable *rt;
2381
2382                 if (!vxlan->vn4_sock)
2383                         return -EINVAL;
2384                 rt = vxlan_get_route(vxlan, skb, 0, info->key.tos,
2385                                      info->key.u.ipv4.dst,
2386                                      &info->key.u.ipv4.src, NULL, info);
2387                 if (IS_ERR(rt))
2388                         return PTR_ERR(rt);
2389                 ip_rt_put(rt);
2390         } else {
2391 #if IS_ENABLED(CONFIG_IPV6)
2392                 struct dst_entry *ndst;
2393
2394                 if (!vxlan->vn6_sock)
2395                         return -EINVAL;
2396                 ndst = vxlan6_get_route(vxlan, skb, 0, info->key.tos,
2397                                         info->key.label, &info->key.u.ipv6.dst,
2398                                         &info->key.u.ipv6.src, NULL, info);
2399                 if (IS_ERR(ndst))
2400                         return PTR_ERR(ndst);
2401                 dst_release(ndst);
2402 #else /* !CONFIG_IPV6 */
2403                 return -EPFNOSUPPORT;
2404 #endif
2405         }
2406         info->key.tp_src = sport;
2407         info->key.tp_dst = dport;
2408         return 0;
2409 }
2410
2411 static const struct net_device_ops vxlan_netdev_ops = {
2412         .ndo_init               = vxlan_init,
2413         .ndo_uninit             = vxlan_uninit,
2414         .ndo_open               = vxlan_open,
2415         .ndo_stop               = vxlan_stop,
2416         .ndo_start_xmit         = vxlan_xmit,
2417         .ndo_get_stats64        = ip_tunnel_get_stats64,
2418         .ndo_set_rx_mode        = vxlan_set_multicast_list,
2419         .ndo_change_mtu         = vxlan_change_mtu,
2420         .ndo_validate_addr      = eth_validate_addr,
2421         .ndo_set_mac_address    = eth_mac_addr,
2422         .ndo_fdb_add            = vxlan_fdb_add,
2423         .ndo_fdb_del            = vxlan_fdb_delete,
2424         .ndo_fdb_dump           = vxlan_fdb_dump,
2425         .ndo_fill_metadata_dst  = vxlan_fill_metadata_dst,
2426 };
2427
2428 /* Info for udev, that this is a virtual tunnel endpoint */
2429 static struct device_type vxlan_type = {
2430         .name = "vxlan",
2431 };
2432
2433 /* Calls the ndo_add_vxlan_port of the caller in order to
2434  * supply the listening VXLAN udp ports. Callers are expected
2435  * to implement the ndo_add_vxlan_port.
2436  */
2437 void vxlan_get_rx_port(struct net_device *dev)
2438 {
2439         struct vxlan_sock *vs;
2440         struct net *net = dev_net(dev);
2441         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2442         sa_family_t sa_family;
2443         __be16 port;
2444         unsigned int i;
2445
2446         spin_lock(&vn->sock_lock);
2447         for (i = 0; i < PORT_HASH_SIZE; ++i) {
2448                 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2449                         port = inet_sk(vs->sock->sk)->inet_sport;
2450                         sa_family = vxlan_get_sk_family(vs);
2451                         dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
2452                                                             port);
2453                 }
2454         }
2455         spin_unlock(&vn->sock_lock);
2456 }
2457 EXPORT_SYMBOL_GPL(vxlan_get_rx_port);
2458
2459 /* Initialize the device structure. */
2460 static void vxlan_setup(struct net_device *dev)
2461 {
2462         struct vxlan_dev *vxlan = netdev_priv(dev);
2463         unsigned int h;
2464
2465         eth_hw_addr_random(dev);
2466         ether_setup(dev);
2467
2468         dev->netdev_ops = &vxlan_netdev_ops;
2469         dev->destructor = free_netdev;
2470         SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2471
2472         dev->features   |= NETIF_F_LLTX;
2473         dev->features   |= NETIF_F_SG | NETIF_F_HW_CSUM;
2474         dev->features   |= NETIF_F_RXCSUM;
2475         dev->features   |= NETIF_F_GSO_SOFTWARE;
2476
2477         dev->vlan_features = dev->features;
2478         dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2479         dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2480         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2481         dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2482         netif_keep_dst(dev);
2483         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2484         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
2485
2486         INIT_LIST_HEAD(&vxlan->next);
2487         spin_lock_init(&vxlan->hash_lock);
2488
2489         init_timer_deferrable(&vxlan->age_timer);
2490         vxlan->age_timer.function = vxlan_cleanup;
2491         vxlan->age_timer.data = (unsigned long) vxlan;
2492
2493         vxlan->cfg.dst_port = htons(vxlan_port);
2494
2495         vxlan->dev = dev;
2496
2497         gro_cells_init(&vxlan->gro_cells, dev);
2498
2499         for (h = 0; h < FDB_HASH_SIZE; ++h)
2500                 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2501 }
2502
2503 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2504         [IFLA_VXLAN_ID]         = { .type = NLA_U32 },
2505         [IFLA_VXLAN_GROUP]      = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2506         [IFLA_VXLAN_GROUP6]     = { .len = sizeof(struct in6_addr) },
2507         [IFLA_VXLAN_LINK]       = { .type = NLA_U32 },
2508         [IFLA_VXLAN_LOCAL]      = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2509         [IFLA_VXLAN_LOCAL6]     = { .len = sizeof(struct in6_addr) },
2510         [IFLA_VXLAN_TOS]        = { .type = NLA_U8 },
2511         [IFLA_VXLAN_TTL]        = { .type = NLA_U8 },
2512         [IFLA_VXLAN_LABEL]      = { .type = NLA_U32 },
2513         [IFLA_VXLAN_LEARNING]   = { .type = NLA_U8 },
2514         [IFLA_VXLAN_AGEING]     = { .type = NLA_U32 },
2515         [IFLA_VXLAN_LIMIT]      = { .type = NLA_U32 },
2516         [IFLA_VXLAN_PORT_RANGE] = { .len  = sizeof(struct ifla_vxlan_port_range) },
2517         [IFLA_VXLAN_PROXY]      = { .type = NLA_U8 },
2518         [IFLA_VXLAN_RSC]        = { .type = NLA_U8 },
2519         [IFLA_VXLAN_L2MISS]     = { .type = NLA_U8 },
2520         [IFLA_VXLAN_L3MISS]     = { .type = NLA_U8 },
2521         [IFLA_VXLAN_COLLECT_METADATA]   = { .type = NLA_U8 },
2522         [IFLA_VXLAN_PORT]       = { .type = NLA_U16 },
2523         [IFLA_VXLAN_UDP_CSUM]   = { .type = NLA_U8 },
2524         [IFLA_VXLAN_UDP_ZERO_CSUM6_TX]  = { .type = NLA_U8 },
2525         [IFLA_VXLAN_UDP_ZERO_CSUM6_RX]  = { .type = NLA_U8 },
2526         [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2527         [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
2528         [IFLA_VXLAN_GBP]        = { .type = NLA_FLAG, },
2529         [IFLA_VXLAN_REMCSUM_NOPARTIAL]  = { .type = NLA_FLAG },
2530 };
2531
2532 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2533 {
2534         if (tb[IFLA_ADDRESS]) {
2535                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2536                         pr_debug("invalid link address (not ethernet)\n");
2537                         return -EINVAL;
2538                 }
2539
2540                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2541                         pr_debug("invalid all zero ethernet address\n");
2542                         return -EADDRNOTAVAIL;
2543                 }
2544         }
2545
2546         if (!data)
2547                 return -EINVAL;
2548
2549         if (data[IFLA_VXLAN_ID]) {
2550                 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2551                 if (id >= VXLAN_VID_MASK)
2552                         return -ERANGE;
2553         }
2554
2555         if (data[IFLA_VXLAN_PORT_RANGE]) {
2556                 const struct ifla_vxlan_port_range *p
2557                         = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2558
2559                 if (ntohs(p->high) < ntohs(p->low)) {
2560                         pr_debug("port range %u .. %u not valid\n",
2561                                  ntohs(p->low), ntohs(p->high));
2562                         return -EINVAL;
2563                 }
2564         }
2565
2566         return 0;
2567 }
2568
2569 static void vxlan_get_drvinfo(struct net_device *netdev,
2570                               struct ethtool_drvinfo *drvinfo)
2571 {
2572         strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2573         strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2574 }
2575
2576 static const struct ethtool_ops vxlan_ethtool_ops = {
2577         .get_drvinfo    = vxlan_get_drvinfo,
2578         .get_link       = ethtool_op_get_link,
2579 };
2580
2581 static void vxlan_del_work(struct work_struct *work)
2582 {
2583         struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
2584         udp_tunnel_sock_release(vs->sock);
2585         kfree_rcu(vs, rcu);
2586 }
2587
2588 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2589                                         __be16 port, u32 flags)
2590 {
2591         struct socket *sock;
2592         struct udp_port_cfg udp_conf;
2593         int err;
2594
2595         memset(&udp_conf, 0, sizeof(udp_conf));
2596
2597         if (ipv6) {
2598                 udp_conf.family = AF_INET6;
2599                 udp_conf.use_udp6_rx_checksums =
2600                     !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2601                 udp_conf.ipv6_v6only = 1;
2602         } else {
2603                 udp_conf.family = AF_INET;
2604         }
2605
2606         udp_conf.local_udp_port = port;
2607
2608         /* Open UDP socket */
2609         err = udp_sock_create(net, &udp_conf, &sock);
2610         if (err < 0)
2611                 return ERR_PTR(err);
2612
2613         return sock;
2614 }
2615
2616 /* Create new listen socket if needed */
2617 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
2618                                               __be16 port, u32 flags)
2619 {
2620         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2621         struct vxlan_sock *vs;
2622         struct socket *sock;
2623         unsigned int h;
2624         struct udp_tunnel_sock_cfg tunnel_cfg;
2625
2626         vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2627         if (!vs)
2628                 return ERR_PTR(-ENOMEM);
2629
2630         for (h = 0; h < VNI_HASH_SIZE; ++h)
2631                 INIT_HLIST_HEAD(&vs->vni_list[h]);
2632
2633         INIT_WORK(&vs->del_work, vxlan_del_work);
2634
2635         sock = vxlan_create_sock(net, ipv6, port, flags);
2636         if (IS_ERR(sock)) {
2637                 pr_info("Cannot bind port %d, err=%ld\n", ntohs(port),
2638                         PTR_ERR(sock));
2639                 kfree(vs);
2640                 return ERR_CAST(sock);
2641         }
2642
2643         vs->sock = sock;
2644         atomic_set(&vs->refcnt, 1);
2645         vs->flags = (flags & VXLAN_F_RCV_FLAGS);
2646
2647         /* Initialize the vxlan udp offloads structure */
2648         vs->udp_offloads.port = port;
2649         vs->udp_offloads.callbacks.gro_receive  = vxlan_gro_receive;
2650         vs->udp_offloads.callbacks.gro_complete = vxlan_gro_complete;
2651
2652         spin_lock(&vn->sock_lock);
2653         hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2654         vxlan_notify_add_rx_port(vs);
2655         spin_unlock(&vn->sock_lock);
2656
2657         /* Mark socket as an encapsulation socket. */
2658         tunnel_cfg.sk_user_data = vs;
2659         tunnel_cfg.encap_type = 1;
2660         tunnel_cfg.encap_rcv = vxlan_rcv;
2661         tunnel_cfg.encap_destroy = NULL;
2662
2663         setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
2664
2665         return vs;
2666 }
2667
2668 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
2669 {
2670         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2671         struct vxlan_sock *vs = NULL;
2672
2673         if (!vxlan->cfg.no_share) {
2674                 spin_lock(&vn->sock_lock);
2675                 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
2676                                      vxlan->cfg.dst_port, vxlan->flags);
2677                 if (vs && !atomic_add_unless(&vs->refcnt, 1, 0)) {
2678                         spin_unlock(&vn->sock_lock);
2679                         return -EBUSY;
2680                 }
2681                 spin_unlock(&vn->sock_lock);
2682         }
2683         if (!vs)
2684                 vs = vxlan_socket_create(vxlan->net, ipv6,
2685                                          vxlan->cfg.dst_port, vxlan->flags);
2686         if (IS_ERR(vs))
2687                 return PTR_ERR(vs);
2688 #if IS_ENABLED(CONFIG_IPV6)
2689         if (ipv6)
2690                 vxlan->vn6_sock = vs;
2691         else
2692 #endif
2693                 vxlan->vn4_sock = vs;
2694         vxlan_vs_add_dev(vs, vxlan);
2695         return 0;
2696 }
2697
2698 static int vxlan_sock_add(struct vxlan_dev *vxlan)
2699 {
2700         bool ipv6 = vxlan->flags & VXLAN_F_IPV6;
2701         bool metadata = vxlan->flags & VXLAN_F_COLLECT_METADATA;
2702         int ret = 0;
2703
2704         vxlan->vn4_sock = NULL;
2705 #if IS_ENABLED(CONFIG_IPV6)
2706         vxlan->vn6_sock = NULL;
2707         if (ipv6 || metadata)
2708                 ret = __vxlan_sock_add(vxlan, true);
2709 #endif
2710         if (!ret && (!ipv6 || metadata))
2711                 ret = __vxlan_sock_add(vxlan, false);
2712         if (ret < 0)
2713                 vxlan_sock_release(vxlan);
2714         return ret;
2715 }
2716
2717 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
2718                                struct vxlan_config *conf)
2719 {
2720         struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
2721         struct vxlan_dev *vxlan = netdev_priv(dev), *tmp;
2722         struct vxlan_rdst *dst = &vxlan->default_dst;
2723         unsigned short needed_headroom = ETH_HLEN;
2724         int err;
2725         bool use_ipv6 = false;
2726         __be16 default_port = vxlan->cfg.dst_port;
2727         struct net_device *lowerdev = NULL;
2728
2729         vxlan->net = src_net;
2730
2731         dst->remote_vni = conf->vni;
2732
2733         memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
2734
2735         /* Unless IPv6 is explicitly requested, assume IPv4 */
2736         if (!dst->remote_ip.sa.sa_family)
2737                 dst->remote_ip.sa.sa_family = AF_INET;
2738
2739         if (dst->remote_ip.sa.sa_family == AF_INET6 ||
2740             vxlan->cfg.saddr.sa.sa_family == AF_INET6) {
2741                 if (!IS_ENABLED(CONFIG_IPV6))
2742                         return -EPFNOSUPPORT;
2743                 use_ipv6 = true;
2744                 vxlan->flags |= VXLAN_F_IPV6;
2745         }
2746
2747         if (conf->label && !use_ipv6) {
2748                 pr_info("label only supported in use with IPv6\n");
2749                 return -EINVAL;
2750         }
2751
2752         if (conf->remote_ifindex) {
2753                 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
2754                 dst->remote_ifindex = conf->remote_ifindex;
2755
2756                 if (!lowerdev) {
2757                         pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
2758                         return -ENODEV;
2759                 }
2760
2761 #if IS_ENABLED(CONFIG_IPV6)
2762                 if (use_ipv6) {
2763                         struct inet6_dev *idev = __in6_dev_get(lowerdev);
2764                         if (idev && idev->cnf.disable_ipv6) {
2765                                 pr_info("IPv6 is disabled via sysctl\n");
2766                                 return -EPERM;
2767                         }
2768                 }
2769 #endif
2770
2771                 if (!conf->mtu)
2772                         dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2773
2774                 needed_headroom = lowerdev->hard_header_len;
2775         }
2776
2777         if (conf->mtu) {
2778                 err = __vxlan_change_mtu(dev, lowerdev, dst, conf->mtu, false);
2779                 if (err)
2780                         return err;
2781         }
2782
2783         if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
2784                 needed_headroom += VXLAN6_HEADROOM;
2785         else
2786                 needed_headroom += VXLAN_HEADROOM;
2787         dev->needed_headroom = needed_headroom;
2788
2789         memcpy(&vxlan->cfg, conf, sizeof(*conf));
2790         if (!vxlan->cfg.dst_port)
2791                 vxlan->cfg.dst_port = default_port;
2792         vxlan->flags |= conf->flags;
2793
2794         if (!vxlan->cfg.age_interval)
2795                 vxlan->cfg.age_interval = FDB_AGE_DEFAULT;
2796
2797         list_for_each_entry(tmp, &vn->vxlan_list, next) {
2798                 if (tmp->cfg.vni == conf->vni &&
2799                     (tmp->default_dst.remote_ip.sa.sa_family == AF_INET6 ||
2800                      tmp->cfg.saddr.sa.sa_family == AF_INET6) == use_ipv6 &&
2801                     tmp->cfg.dst_port == vxlan->cfg.dst_port &&
2802                     (tmp->flags & VXLAN_F_RCV_FLAGS) ==
2803                     (vxlan->flags & VXLAN_F_RCV_FLAGS))
2804                 return -EEXIST;
2805         }
2806
2807         dev->ethtool_ops = &vxlan_ethtool_ops;
2808
2809         /* create an fdb entry for a valid default destination */
2810         if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2811                 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2812                                        &vxlan->default_dst.remote_ip,
2813                                        NUD_REACHABLE|NUD_PERMANENT,
2814                                        NLM_F_EXCL|NLM_F_CREATE,
2815                                        vxlan->cfg.dst_port,
2816                                        vxlan->default_dst.remote_vni,
2817                                        vxlan->default_dst.remote_ifindex,
2818                                        NTF_SELF);
2819                 if (err)
2820                         return err;
2821         }
2822
2823         err = register_netdevice(dev);
2824         if (err) {
2825                 vxlan_fdb_delete_default(vxlan);
2826                 return err;
2827         }
2828
2829         list_add(&vxlan->next, &vn->vxlan_list);
2830
2831         return 0;
2832 }
2833
2834 struct net_device *vxlan_dev_create(struct net *net, const char *name,
2835                                     u8 name_assign_type, struct vxlan_config *conf)
2836 {
2837         struct nlattr *tb[IFLA_MAX+1];
2838         struct net_device *dev;
2839         int err;
2840
2841         memset(&tb, 0, sizeof(tb));
2842
2843         dev = rtnl_create_link(net, name, name_assign_type,
2844                                &vxlan_link_ops, tb);
2845         if (IS_ERR(dev))
2846                 return dev;
2847
2848         err = vxlan_dev_configure(net, dev, conf);
2849         if (err < 0) {
2850                 free_netdev(dev);
2851                 return ERR_PTR(err);
2852         }
2853
2854         return dev;
2855 }
2856 EXPORT_SYMBOL_GPL(vxlan_dev_create);
2857
2858 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
2859                          struct nlattr *tb[], struct nlattr *data[])
2860 {
2861         struct vxlan_config conf;
2862         int err;
2863
2864         memset(&conf, 0, sizeof(conf));
2865
2866         if (data[IFLA_VXLAN_ID])
2867                 conf.vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
2868
2869         if (data[IFLA_VXLAN_GROUP]) {
2870                 conf.remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
2871         } else if (data[IFLA_VXLAN_GROUP6]) {
2872                 if (!IS_ENABLED(CONFIG_IPV6))
2873                         return -EPFNOSUPPORT;
2874
2875                 conf.remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
2876                 conf.remote_ip.sa.sa_family = AF_INET6;
2877         }
2878
2879         if (data[IFLA_VXLAN_LOCAL]) {
2880                 conf.saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
2881                 conf.saddr.sa.sa_family = AF_INET;
2882         } else if (data[IFLA_VXLAN_LOCAL6]) {
2883                 if (!IS_ENABLED(CONFIG_IPV6))
2884                         return -EPFNOSUPPORT;
2885
2886                 /* TODO: respect scope id */
2887                 conf.saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
2888                 conf.saddr.sa.sa_family = AF_INET6;
2889         }
2890
2891         if (data[IFLA_VXLAN_LINK])
2892                 conf.remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
2893
2894         if (data[IFLA_VXLAN_TOS])
2895                 conf.tos  = nla_get_u8(data[IFLA_VXLAN_TOS]);
2896
2897         if (data[IFLA_VXLAN_TTL])
2898                 conf.ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
2899
2900         if (data[IFLA_VXLAN_LABEL])
2901                 conf.label = nla_get_be32(data[IFLA_VXLAN_LABEL]) &
2902                              IPV6_FLOWLABEL_MASK;
2903
2904         if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
2905                 conf.flags |= VXLAN_F_LEARN;
2906
2907         if (data[IFLA_VXLAN_AGEING])
2908                 conf.age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
2909
2910         if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
2911                 conf.flags |= VXLAN_F_PROXY;
2912
2913         if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
2914                 conf.flags |= VXLAN_F_RSC;
2915
2916         if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
2917                 conf.flags |= VXLAN_F_L2MISS;
2918
2919         if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
2920                 conf.flags |= VXLAN_F_L3MISS;
2921
2922         if (data[IFLA_VXLAN_LIMIT])
2923                 conf.addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
2924
2925         if (data[IFLA_VXLAN_COLLECT_METADATA] &&
2926             nla_get_u8(data[IFLA_VXLAN_COLLECT_METADATA]))
2927                 conf.flags |= VXLAN_F_COLLECT_METADATA;
2928
2929         if (data[IFLA_VXLAN_PORT_RANGE]) {
2930                 const struct ifla_vxlan_port_range *p
2931                         = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2932                 conf.port_min = ntohs(p->low);
2933                 conf.port_max = ntohs(p->high);
2934         }
2935
2936         if (data[IFLA_VXLAN_PORT])
2937                 conf.dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
2938
2939         if (data[IFLA_VXLAN_UDP_CSUM] &&
2940             !nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
2941                 conf.flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
2942
2943         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
2944             nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
2945                 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
2946
2947         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
2948             nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
2949                 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
2950
2951         if (data[IFLA_VXLAN_REMCSUM_TX] &&
2952             nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
2953                 conf.flags |= VXLAN_F_REMCSUM_TX;
2954
2955         if (data[IFLA_VXLAN_REMCSUM_RX] &&
2956             nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
2957                 conf.flags |= VXLAN_F_REMCSUM_RX;
2958
2959         if (data[IFLA_VXLAN_GBP])
2960                 conf.flags |= VXLAN_F_GBP;
2961
2962         if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL])
2963                 conf.flags |= VXLAN_F_REMCSUM_NOPARTIAL;
2964
2965         err = vxlan_dev_configure(src_net, dev, &conf);
2966         switch (err) {
2967         case -ENODEV:
2968                 pr_info("ifindex %d does not exist\n", conf.remote_ifindex);
2969                 break;
2970
2971         case -EPERM:
2972                 pr_info("IPv6 is disabled via sysctl\n");
2973                 break;
2974
2975         case -EEXIST:
2976                 pr_info("duplicate VNI %u\n", be32_to_cpu(conf.vni));
2977                 break;
2978         }
2979
2980         return err;
2981 }
2982
2983 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
2984 {
2985         struct vxlan_dev *vxlan = netdev_priv(dev);
2986         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2987
2988         spin_lock(&vn->sock_lock);
2989         if (!hlist_unhashed(&vxlan->hlist))
2990                 hlist_del_rcu(&vxlan->hlist);
2991         spin_unlock(&vn->sock_lock);
2992
2993         gro_cells_destroy(&vxlan->gro_cells);
2994         list_del(&vxlan->next);
2995         unregister_netdevice_queue(dev, head);
2996 }
2997
2998 static size_t vxlan_get_size(const struct net_device *dev)
2999 {
3000
3001         return nla_total_size(sizeof(__u32)) +  /* IFLA_VXLAN_ID */
3002                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
3003                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
3004                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
3005                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TTL */
3006                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TOS */
3007                 nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */
3008                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_LEARNING */
3009                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_PROXY */
3010                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_RSC */
3011                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L2MISS */
3012                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L3MISS */
3013                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_COLLECT_METADATA */
3014                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
3015                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
3016                 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
3017                 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
3018                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
3019                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
3020                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
3021                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
3022                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
3023                 0;
3024 }
3025
3026 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
3027 {
3028         const struct vxlan_dev *vxlan = netdev_priv(dev);
3029         const struct vxlan_rdst *dst = &vxlan->default_dst;
3030         struct ifla_vxlan_port_range ports = {
3031                 .low =  htons(vxlan->cfg.port_min),
3032                 .high = htons(vxlan->cfg.port_max),
3033         };
3034
3035         if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni)))
3036                 goto nla_put_failure;
3037
3038         if (!vxlan_addr_any(&dst->remote_ip)) {
3039                 if (dst->remote_ip.sa.sa_family == AF_INET) {
3040                         if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
3041                                             dst->remote_ip.sin.sin_addr.s_addr))
3042                                 goto nla_put_failure;
3043 #if IS_ENABLED(CONFIG_IPV6)
3044                 } else {
3045                         if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
3046                                              &dst->remote_ip.sin6.sin6_addr))
3047                                 goto nla_put_failure;
3048 #endif
3049                 }
3050         }
3051
3052         if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
3053                 goto nla_put_failure;
3054
3055         if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
3056                 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
3057                         if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
3058                                             vxlan->cfg.saddr.sin.sin_addr.s_addr))
3059                                 goto nla_put_failure;
3060 #if IS_ENABLED(CONFIG_IPV6)
3061                 } else {
3062                         if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
3063                                              &vxlan->cfg.saddr.sin6.sin6_addr))
3064                                 goto nla_put_failure;
3065 #endif
3066                 }
3067         }
3068
3069         if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
3070             nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
3071             nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) ||
3072             nla_put_u8(skb, IFLA_VXLAN_LEARNING,
3073                         !!(vxlan->flags & VXLAN_F_LEARN)) ||
3074             nla_put_u8(skb, IFLA_VXLAN_PROXY,
3075                         !!(vxlan->flags & VXLAN_F_PROXY)) ||
3076             nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
3077             nla_put_u8(skb, IFLA_VXLAN_L2MISS,
3078                         !!(vxlan->flags & VXLAN_F_L2MISS)) ||
3079             nla_put_u8(skb, IFLA_VXLAN_L3MISS,
3080                         !!(vxlan->flags & VXLAN_F_L3MISS)) ||
3081             nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
3082                        !!(vxlan->flags & VXLAN_F_COLLECT_METADATA)) ||
3083             nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
3084             nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
3085             nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
3086             nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
3087                         !(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
3088             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
3089                         !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
3090             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
3091                         !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
3092             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
3093                         !!(vxlan->flags & VXLAN_F_REMCSUM_TX)) ||
3094             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
3095                         !!(vxlan->flags & VXLAN_F_REMCSUM_RX)))
3096                 goto nla_put_failure;
3097
3098         if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
3099                 goto nla_put_failure;
3100
3101         if (vxlan->flags & VXLAN_F_GBP &&
3102             nla_put_flag(skb, IFLA_VXLAN_GBP))
3103                 goto nla_put_failure;
3104
3105         if (vxlan->flags & VXLAN_F_REMCSUM_NOPARTIAL &&
3106             nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
3107                 goto nla_put_failure;
3108
3109         return 0;
3110
3111 nla_put_failure:
3112         return -EMSGSIZE;
3113 }
3114
3115 static struct net *vxlan_get_link_net(const struct net_device *dev)
3116 {
3117         struct vxlan_dev *vxlan = netdev_priv(dev);
3118
3119         return vxlan->net;
3120 }
3121
3122 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
3123         .kind           = "vxlan",
3124         .maxtype        = IFLA_VXLAN_MAX,
3125         .policy         = vxlan_policy,
3126         .priv_size      = sizeof(struct vxlan_dev),
3127         .setup          = vxlan_setup,
3128         .validate       = vxlan_validate,
3129         .newlink        = vxlan_newlink,
3130         .dellink        = vxlan_dellink,
3131         .get_size       = vxlan_get_size,
3132         .fill_info      = vxlan_fill_info,
3133         .get_link_net   = vxlan_get_link_net,
3134 };
3135
3136 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
3137                                              struct net_device *dev)
3138 {
3139         struct vxlan_dev *vxlan, *next;
3140         LIST_HEAD(list_kill);
3141
3142         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3143                 struct vxlan_rdst *dst = &vxlan->default_dst;
3144
3145                 /* In case we created vxlan device with carrier
3146                  * and we loose the carrier due to module unload
3147                  * we also need to remove vxlan device. In other
3148                  * cases, it's not necessary and remote_ifindex
3149                  * is 0 here, so no matches.
3150                  */
3151                 if (dst->remote_ifindex == dev->ifindex)
3152                         vxlan_dellink(vxlan->dev, &list_kill);
3153         }
3154
3155         unregister_netdevice_many(&list_kill);
3156 }
3157
3158 static int vxlan_lowerdev_event(struct notifier_block *unused,
3159                                 unsigned long event, void *ptr)
3160 {
3161         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3162         struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
3163
3164         if (event == NETDEV_UNREGISTER)
3165                 vxlan_handle_lowerdev_unregister(vn, dev);
3166
3167         return NOTIFY_DONE;
3168 }
3169
3170 static struct notifier_block vxlan_notifier_block __read_mostly = {
3171         .notifier_call = vxlan_lowerdev_event,
3172 };
3173
3174 static __net_init int vxlan_init_net(struct net *net)
3175 {
3176         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3177         unsigned int h;
3178
3179         INIT_LIST_HEAD(&vn->vxlan_list);
3180         spin_lock_init(&vn->sock_lock);
3181
3182         for (h = 0; h < PORT_HASH_SIZE; ++h)
3183                 INIT_HLIST_HEAD(&vn->sock_list[h]);
3184
3185         return 0;
3186 }
3187
3188 static void __net_exit vxlan_exit_net(struct net *net)
3189 {
3190         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3191         struct vxlan_dev *vxlan, *next;
3192         struct net_device *dev, *aux;
3193         LIST_HEAD(list);
3194
3195         rtnl_lock();
3196         for_each_netdev_safe(net, dev, aux)
3197                 if (dev->rtnl_link_ops == &vxlan_link_ops)
3198                         unregister_netdevice_queue(dev, &list);
3199
3200         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3201                 /* If vxlan->dev is in the same netns, it has already been added
3202                  * to the list by the previous loop.
3203                  */
3204                 if (!net_eq(dev_net(vxlan->dev), net)) {
3205                         gro_cells_destroy(&vxlan->gro_cells);
3206                         unregister_netdevice_queue(vxlan->dev, &list);
3207                 }
3208         }
3209
3210         unregister_netdevice_many(&list);
3211         rtnl_unlock();
3212 }
3213
3214 static struct pernet_operations vxlan_net_ops = {
3215         .init = vxlan_init_net,
3216         .exit = vxlan_exit_net,
3217         .id   = &vxlan_net_id,
3218         .size = sizeof(struct vxlan_net),
3219 };
3220
3221 static int __init vxlan_init_module(void)
3222 {
3223         int rc;
3224
3225         vxlan_wq = alloc_workqueue("vxlan", 0, 0);
3226         if (!vxlan_wq)
3227                 return -ENOMEM;
3228
3229         get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
3230
3231         rc = register_pernet_subsys(&vxlan_net_ops);
3232         if (rc)
3233                 goto out1;
3234
3235         rc = register_netdevice_notifier(&vxlan_notifier_block);
3236         if (rc)
3237                 goto out2;
3238
3239         rc = rtnl_link_register(&vxlan_link_ops);
3240         if (rc)
3241                 goto out3;
3242
3243         return 0;
3244 out3:
3245         unregister_netdevice_notifier(&vxlan_notifier_block);
3246 out2:
3247         unregister_pernet_subsys(&vxlan_net_ops);
3248 out1:
3249         destroy_workqueue(vxlan_wq);
3250         return rc;
3251 }
3252 late_initcall(vxlan_init_module);
3253
3254 static void __exit vxlan_cleanup_module(void)
3255 {
3256         rtnl_link_unregister(&vxlan_link_ops);
3257         unregister_netdevice_notifier(&vxlan_notifier_block);
3258         destroy_workqueue(vxlan_wq);
3259         unregister_pernet_subsys(&vxlan_net_ops);
3260         /* rcu_barrier() is called by netns */
3261 }
3262 module_exit(vxlan_cleanup_module);
3263
3264 MODULE_LICENSE("GPL");
3265 MODULE_VERSION(VXLAN_VERSION);
3266 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
3267 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
3268 MODULE_ALIAS_RTNL_LINK("vxlan");