linux/drivers/net/vxlan.c
<<
>>
Prefs
   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#include <net/udp_tunnel.h>
  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
  53#define VXLAN_VERSION   "0.1"
  54
  55#define PORT_HASH_BITS  8
  56#define PORT_HASH_SIZE  (1<<PORT_HASH_BITS)
  57#define VNI_HASH_BITS   10
  58#define VNI_HASH_SIZE   (1<<VNI_HASH_BITS)
  59#define FDB_HASH_BITS   8
  60#define FDB_HASH_SIZE   (1<<FDB_HASH_BITS)
  61#define FDB_AGE_DEFAULT 300 /* 5 min */
  62#define FDB_AGE_INTERVAL (10 * HZ)      /* rescan interval */
  63
  64/* UDP port for VXLAN traffic.
  65 * The IANA assigned port is 4789, but the Linux default is 8472
  66 * for compatibility with early adopters.
  67 */
  68static unsigned short vxlan_port __read_mostly = 8472;
  69module_param_named(udp_port, vxlan_port, ushort, 0444);
  70MODULE_PARM_DESC(udp_port, "Destination UDP port");
  71
  72static bool log_ecn_error = true;
  73module_param(log_ecn_error, bool, 0644);
  74MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
  75
  76static int vxlan_net_id;
  77
  78static const u8 all_zeros_mac[ETH_ALEN];
  79
  80/* per-network namespace private data for this module */
  81struct vxlan_net {
  82        struct list_head  vxlan_list;
  83        struct hlist_head sock_list[PORT_HASH_SIZE];
  84        spinlock_t        sock_lock;
  85};
  86
  87union vxlan_addr {
  88        struct sockaddr_in sin;
  89        struct sockaddr_in6 sin6;
  90        struct sockaddr sa;
  91};
  92
  93struct vxlan_rdst {
  94        union vxlan_addr         remote_ip;
  95        __be16                   remote_port;
  96        u32                      remote_vni;
  97        u32                      remote_ifindex;
  98        struct list_head         list;
  99        struct rcu_head          rcu;
 100};
 101
 102/* Forwarding table entry */
 103struct vxlan_fdb {
 104        struct hlist_node hlist;        /* linked list of entries */
 105        struct rcu_head   rcu;
 106        unsigned long     updated;      /* jiffies */
 107        unsigned long     used;
 108        struct list_head  remotes;
 109        u16               state;        /* see ndm_state */
 110        u8                flags;        /* see ndm_flags */
 111        u8                eth_addr[ETH_ALEN];
 112};
 113
 114/* Pseudo network device */
 115struct vxlan_dev {
 116        struct hlist_node hlist;        /* vni hash table */
 117        struct list_head  next;         /* vxlan's per namespace list */
 118        struct vxlan_sock *vn_sock;     /* listening socket */
 119        struct net_device *dev;
 120        struct net        *net;         /* netns for packet i/o */
 121        struct vxlan_rdst default_dst;  /* default destination */
 122        union vxlan_addr  saddr;        /* source address */
 123        __be16            dst_port;
 124        __u16             port_min;     /* source port range */
 125        __u16             port_max;
 126        __u8              tos;          /* TOS override */
 127        __u8              ttl;
 128        u32               flags;        /* VXLAN_F_* in vxlan.h */
 129
 130        unsigned long     age_interval;
 131        struct timer_list age_timer;
 132        spinlock_t        hash_lock;
 133        unsigned int      addrcnt;
 134        unsigned int      addrmax;
 135
 136        struct hlist_head fdb_head[FDB_HASH_SIZE];
 137};
 138
 139/* salt for hash table */
 140static u32 vxlan_salt __read_mostly;
 141static struct workqueue_struct *vxlan_wq;
 142
 143#if IS_ENABLED(CONFIG_IPV6)
 144static inline
 145bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
 146{
 147        if (a->sa.sa_family != b->sa.sa_family)
 148                return false;
 149        if (a->sa.sa_family == AF_INET6)
 150                return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
 151        else
 152                return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
 153}
 154
 155static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
 156{
 157        if (ipa->sa.sa_family == AF_INET6)
 158                return ipv6_addr_any(&ipa->sin6.sin6_addr);
 159        else
 160                return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
 161}
 162
 163static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
 164{
 165        if (ipa->sa.sa_family == AF_INET6)
 166                return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
 167        else
 168                return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
 169}
 170
 171static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
 172{
 173        if (nla_len(nla) >= sizeof(struct in6_addr)) {
 174                ip->sin6.sin6_addr = nla_get_in6_addr(nla);
 175                ip->sa.sa_family = AF_INET6;
 176                return 0;
 177        } else if (nla_len(nla) >= sizeof(__be32)) {
 178                ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
 179                ip->sa.sa_family = AF_INET;
 180                return 0;
 181        } else {
 182                return -EAFNOSUPPORT;
 183        }
 184}
 185
 186static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
 187                              const union vxlan_addr *ip)
 188{
 189        if (ip->sa.sa_family == AF_INET6)
 190                return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
 191        else
 192                return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
 193}
 194
 195#else /* !CONFIG_IPV6 */
 196
 197static inline
 198bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
 199{
 200        return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
 201}
 202
 203static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
 204{
 205        return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
 206}
 207
 208static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
 209{
 210        return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
 211}
 212
 213static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
 214{
 215        if (nla_len(nla) >= sizeof(struct in6_addr)) {
 216                return -EAFNOSUPPORT;
 217        } else if (nla_len(nla) >= sizeof(__be32)) {
 218                ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
 219                ip->sa.sa_family = AF_INET;
 220                return 0;
 221        } else {
 222                return -EAFNOSUPPORT;
 223        }
 224}
 225
 226static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
 227                              const union vxlan_addr *ip)
 228{
 229        return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
 230}
 231#endif
 232
 233/* Virtual Network hash table head */
 234static inline struct hlist_head *vni_head(struct vxlan_sock *vs, u32 id)
 235{
 236        return &vs->vni_list[hash_32(id, VNI_HASH_BITS)];
 237}
 238
 239/* Socket hash table head */
 240static inline struct hlist_head *vs_head(struct net *net, __be16 port)
 241{
 242        struct vxlan_net *vn = net_generic(net, vxlan_net_id);
 243
 244        return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
 245}
 246
 247/* First remote destination for a forwarding entry.
 248 * Guaranteed to be non-NULL because remotes are never deleted.
 249 */
 250static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
 251{
 252        return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
 253}
 254
 255static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
 256{
 257        return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
 258}
 259
 260/* Find VXLAN socket based on network namespace, address family and UDP port
 261 * and enabled unshareable flags.
 262 */
 263static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
 264                                          __be16 port, u32 flags)
 265{
 266        struct vxlan_sock *vs;
 267
 268        flags &= VXLAN_F_RCV_FLAGS;
 269
 270        hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
 271                if (inet_sk(vs->sock->sk)->inet_sport == port &&
 272                    inet_sk(vs->sock->sk)->sk.sk_family == family &&
 273                    vs->flags == flags)
 274                        return vs;
 275        }
 276        return NULL;
 277}
 278
 279static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, u32 id)
 280{
 281        struct vxlan_dev *vxlan;
 282
 283        hlist_for_each_entry_rcu(vxlan, vni_head(vs, id), hlist) {
 284                if (vxlan->default_dst.remote_vni == id)
 285                        return vxlan;
 286        }
 287
 288        return NULL;
 289}
 290
 291/* Look up VNI in a per net namespace table */
 292static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id,
 293                                        sa_family_t family, __be16 port,
 294                                        u32 flags)
 295{
 296        struct vxlan_sock *vs;
 297
 298        vs = vxlan_find_sock(net, family, port, flags);
 299        if (!vs)
 300                return NULL;
 301
 302        return vxlan_vs_find_vni(vs, id);
 303}
 304
 305/* Fill in neighbour message in skbuff. */
 306static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
 307                          const struct vxlan_fdb *fdb,
 308                          u32 portid, u32 seq, int type, unsigned int flags,
 309                          const struct vxlan_rdst *rdst)
 310{
 311        unsigned long now = jiffies;
 312        struct nda_cacheinfo ci;
 313        struct nlmsghdr *nlh;
 314        struct ndmsg *ndm;
 315        bool send_ip, send_eth;
 316
 317        nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
 318        if (nlh == NULL)
 319                return -EMSGSIZE;
 320
 321        ndm = nlmsg_data(nlh);
 322        memset(ndm, 0, sizeof(*ndm));
 323
 324        send_eth = send_ip = true;
 325
 326        if (type == RTM_GETNEIGH) {
 327                ndm->ndm_family = AF_INET;
 328                send_ip = !vxlan_addr_any(&rdst->remote_ip);
 329                send_eth = !is_zero_ether_addr(fdb->eth_addr);
 330        } else
 331                ndm->ndm_family = AF_BRIDGE;
 332        ndm->ndm_state = fdb->state;
 333        ndm->ndm_ifindex = vxlan->dev->ifindex;
 334        ndm->ndm_flags = fdb->flags;
 335        ndm->ndm_type = RTN_UNICAST;
 336
 337        if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
 338            nla_put_s32(skb, NDA_LINK_NETNSID,
 339                        peernet2id_alloc(dev_net(vxlan->dev), vxlan->net)))
 340                goto nla_put_failure;
 341
 342        if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
 343                goto nla_put_failure;
 344
 345        if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
 346                goto nla_put_failure;
 347
 348        if (rdst->remote_port && rdst->remote_port != vxlan->dst_port &&
 349            nla_put_be16(skb, NDA_PORT, rdst->remote_port))
 350                goto nla_put_failure;
 351        if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
 352            nla_put_u32(skb, NDA_VNI, rdst->remote_vni))
 353                goto nla_put_failure;
 354        if (rdst->remote_ifindex &&
 355            nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
 356                goto nla_put_failure;
 357
 358        ci.ndm_used      = jiffies_to_clock_t(now - fdb->used);
 359        ci.ndm_confirmed = 0;
 360        ci.ndm_updated   = jiffies_to_clock_t(now - fdb->updated);
 361        ci.ndm_refcnt    = 0;
 362
 363        if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
 364                goto nla_put_failure;
 365
 366        nlmsg_end(skb, nlh);
 367        return 0;
 368
 369nla_put_failure:
 370        nlmsg_cancel(skb, nlh);
 371        return -EMSGSIZE;
 372}
 373
 374static inline size_t vxlan_nlmsg_size(void)
 375{
 376        return NLMSG_ALIGN(sizeof(struct ndmsg))
 377                + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
 378                + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
 379                + nla_total_size(sizeof(__be16)) /* NDA_PORT */
 380                + nla_total_size(sizeof(__be32)) /* NDA_VNI */
 381                + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
 382                + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
 383                + nla_total_size(sizeof(struct nda_cacheinfo));
 384}
 385
 386static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
 387                             struct vxlan_rdst *rd, int type)
 388{
 389        struct net *net = dev_net(vxlan->dev);
 390        struct sk_buff *skb;
 391        int err = -ENOBUFS;
 392
 393        skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
 394        if (skb == NULL)
 395                goto errout;
 396
 397        err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
 398        if (err < 0) {
 399                /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
 400                WARN_ON(err == -EMSGSIZE);
 401                kfree_skb(skb);
 402                goto errout;
 403        }
 404
 405        rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
 406        return;
 407errout:
 408        if (err < 0)
 409                rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
 410}
 411
 412static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
 413{
 414        struct vxlan_dev *vxlan = netdev_priv(dev);
 415        struct vxlan_fdb f = {
 416                .state = NUD_STALE,
 417        };
 418        struct vxlan_rdst remote = {
 419                .remote_ip = *ipa, /* goes to NDA_DST */
 420                .remote_vni = VXLAN_N_VID,
 421        };
 422
 423        vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
 424}
 425
 426static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
 427{
 428        struct vxlan_fdb f = {
 429                .state = NUD_STALE,
 430        };
 431        struct vxlan_rdst remote = { };
 432
 433        memcpy(f.eth_addr, eth_addr, ETH_ALEN);
 434
 435        vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
 436}
 437
 438/* Hash Ethernet address */
 439static u32 eth_hash(const unsigned char *addr)
 440{
 441        u64 value = get_unaligned((u64 *)addr);
 442
 443        /* only want 6 bytes */
 444#ifdef __BIG_ENDIAN
 445        value >>= 16;
 446#else
 447        value <<= 16;
 448#endif
 449        return hash_64(value, FDB_HASH_BITS);
 450}
 451
 452/* Hash chain to use given mac address */
 453static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
 454                                                const u8 *mac)
 455{
 456        return &vxlan->fdb_head[eth_hash(mac)];
 457}
 458
 459/* Look up Ethernet address in forwarding table */
 460static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
 461                                        const u8 *mac)
 462{
 463        struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
 464        struct vxlan_fdb *f;
 465
 466        hlist_for_each_entry_rcu(f, head, hlist) {
 467                if (ether_addr_equal(mac, f->eth_addr))
 468                        return f;
 469        }
 470
 471        return NULL;
 472}
 473
 474static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
 475                                        const u8 *mac)
 476{
 477        struct vxlan_fdb *f;
 478
 479        f = __vxlan_find_mac(vxlan, mac);
 480        if (f)
 481                f->used = jiffies;
 482
 483        return f;
 484}
 485
 486/* caller should hold vxlan->hash_lock */
 487static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
 488                                              union vxlan_addr *ip, __be16 port,
 489                                              __u32 vni, __u32 ifindex)
 490{
 491        struct vxlan_rdst *rd;
 492
 493        list_for_each_entry(rd, &f->remotes, list) {
 494                if (vxlan_addr_equal(&rd->remote_ip, ip) &&
 495                    rd->remote_port == port &&
 496                    rd->remote_vni == vni &&
 497                    rd->remote_ifindex == ifindex)
 498                        return rd;
 499        }
 500
 501        return NULL;
 502}
 503
 504/* Replace destination of unicast mac */
 505static int vxlan_fdb_replace(struct vxlan_fdb *f,
 506                             union vxlan_addr *ip, __be16 port, __u32 vni, __u32 ifindex)
 507{
 508        struct vxlan_rdst *rd;
 509
 510        rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
 511        if (rd)
 512                return 0;
 513
 514        rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
 515        if (!rd)
 516                return 0;
 517        rd->remote_ip = *ip;
 518        rd->remote_port = port;
 519        rd->remote_vni = vni;
 520        rd->remote_ifindex = ifindex;
 521        return 1;
 522}
 523
 524/* Add/update destinations for multicast */
 525static int vxlan_fdb_append(struct vxlan_fdb *f,
 526                            union vxlan_addr *ip, __be16 port, __u32 vni,
 527                            __u32 ifindex, struct vxlan_rdst **rdp)
 528{
 529        struct vxlan_rdst *rd;
 530
 531        rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
 532        if (rd)
 533                return 0;
 534
 535        rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
 536        if (rd == NULL)
 537                return -ENOBUFS;
 538        rd->remote_ip = *ip;
 539        rd->remote_port = port;
 540        rd->remote_vni = vni;
 541        rd->remote_ifindex = ifindex;
 542
 543        list_add_tail_rcu(&rd->list, &f->remotes);
 544
 545        *rdp = rd;
 546        return 1;
 547}
 548
 549static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
 550                                          unsigned int off,
 551                                          struct vxlanhdr *vh, size_t hdrlen,
 552                                          u32 data, struct gro_remcsum *grc,
 553                                          bool nopartial)
 554{
 555        size_t start, offset, plen;
 556
 557        if (skb->remcsum_offload)
 558                return NULL;
 559
 560        if (!NAPI_GRO_CB(skb)->csum_valid)
 561                return NULL;
 562
 563        start = (data & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
 564        offset = start + ((data & VXLAN_RCO_UDP) ?
 565                          offsetof(struct udphdr, check) :
 566                          offsetof(struct tcphdr, check));
 567
 568        plen = hdrlen + offset + sizeof(u16);
 569
 570        /* Pull checksum that will be written */
 571        if (skb_gro_header_hard(skb, off + plen)) {
 572                vh = skb_gro_header_slow(skb, off + plen, off);
 573                if (!vh)
 574                        return NULL;
 575        }
 576
 577        skb_gro_remcsum_process(skb, (void *)vh + hdrlen,
 578                                start, offset, grc, nopartial);
 579
 580        skb->remcsum_offload = 1;
 581
 582        return vh;
 583}
 584
 585static struct sk_buff **vxlan_gro_receive(struct sk_buff **head,
 586                                          struct sk_buff *skb,
 587                                          struct udp_offload *uoff)
 588{
 589        struct sk_buff *p, **pp = NULL;
 590        struct vxlanhdr *vh, *vh2;
 591        unsigned int hlen, off_vx;
 592        int flush = 1;
 593        struct vxlan_sock *vs = container_of(uoff, struct vxlan_sock,
 594                                             udp_offloads);
 595        u32 flags;
 596        struct gro_remcsum grc;
 597
 598        skb_gro_remcsum_init(&grc);
 599
 600        off_vx = skb_gro_offset(skb);
 601        hlen = off_vx + sizeof(*vh);
 602        vh   = skb_gro_header_fast(skb, off_vx);
 603        if (skb_gro_header_hard(skb, hlen)) {
 604                vh = skb_gro_header_slow(skb, hlen, off_vx);
 605                if (unlikely(!vh))
 606                        goto out;
 607        }
 608
 609        skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
 610        skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
 611
 612        flags = ntohl(vh->vx_flags);
 613
 614        if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
 615                vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
 616                                       ntohl(vh->vx_vni), &grc,
 617                                       !!(vs->flags &
 618                                          VXLAN_F_REMCSUM_NOPARTIAL));
 619
 620                if (!vh)
 621                        goto out;
 622        }
 623
 624        flush = 0;
 625
 626        for (p = *head; p; p = p->next) {
 627                if (!NAPI_GRO_CB(p)->same_flow)
 628                        continue;
 629
 630                vh2 = (struct vxlanhdr *)(p->data + off_vx);
 631                if (vh->vx_flags != vh2->vx_flags ||
 632                    vh->vx_vni != vh2->vx_vni) {
 633                        NAPI_GRO_CB(p)->same_flow = 0;
 634                        continue;
 635                }
 636        }
 637
 638        pp = eth_gro_receive(head, skb);
 639
 640out:
 641        skb_gro_remcsum_cleanup(skb, &grc);
 642        NAPI_GRO_CB(skb)->flush |= flush;
 643
 644        return pp;
 645}
 646
 647static int vxlan_gro_complete(struct sk_buff *skb, int nhoff,
 648                              struct udp_offload *uoff)
 649{
 650        udp_tunnel_gro_complete(skb, nhoff);
 651
 652        return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
 653}
 654
 655/* Notify netdevs that UDP port started listening */
 656static void vxlan_notify_add_rx_port(struct vxlan_sock *vs)
 657{
 658        struct net_device *dev;
 659        struct sock *sk = vs->sock->sk;
 660        struct net *net = sock_net(sk);
 661        sa_family_t sa_family = sk->sk_family;
 662        __be16 port = inet_sk(sk)->inet_sport;
 663        int err;
 664
 665        if (sa_family == AF_INET) {
 666                err = udp_add_offload(&vs->udp_offloads);
 667                if (err)
 668                        pr_warn("vxlan: udp_add_offload failed with status %d\n", err);
 669        }
 670
 671        rcu_read_lock();
 672        for_each_netdev_rcu(net, dev) {
 673                if (dev->netdev_ops->ndo_add_vxlan_port)
 674                        dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
 675                                                            port);
 676        }
 677        rcu_read_unlock();
 678}
 679
 680/* Notify netdevs that UDP port is no more listening */
 681static void vxlan_notify_del_rx_port(struct vxlan_sock *vs)
 682{
 683        struct net_device *dev;
 684        struct sock *sk = vs->sock->sk;
 685        struct net *net = sock_net(sk);
 686        sa_family_t sa_family = sk->sk_family;
 687        __be16 port = inet_sk(sk)->inet_sport;
 688
 689        rcu_read_lock();
 690        for_each_netdev_rcu(net, dev) {
 691                if (dev->netdev_ops->ndo_del_vxlan_port)
 692                        dev->netdev_ops->ndo_del_vxlan_port(dev, sa_family,
 693                                                            port);
 694        }
 695        rcu_read_unlock();
 696
 697        if (sa_family == AF_INET)
 698                udp_del_offload(&vs->udp_offloads);
 699}
 700
 701/* Add new entry to forwarding table -- assumes lock held */
 702static int vxlan_fdb_create(struct vxlan_dev *vxlan,
 703                            const u8 *mac, union vxlan_addr *ip,
 704                            __u16 state, __u16 flags,
 705                            __be16 port, __u32 vni, __u32 ifindex,
 706                            __u8 ndm_flags)
 707{
 708        struct vxlan_rdst *rd = NULL;
 709        struct vxlan_fdb *f;
 710        int notify = 0;
 711
 712        f = __vxlan_find_mac(vxlan, mac);
 713        if (f) {
 714                if (flags & NLM_F_EXCL) {
 715                        netdev_dbg(vxlan->dev,
 716                                   "lost race to create %pM\n", mac);
 717                        return -EEXIST;
 718                }
 719                if (f->state != state) {
 720                        f->state = state;
 721                        f->updated = jiffies;
 722                        notify = 1;
 723                }
 724                if (f->flags != ndm_flags) {
 725                        f->flags = ndm_flags;
 726                        f->updated = jiffies;
 727                        notify = 1;
 728                }
 729                if ((flags & NLM_F_REPLACE)) {
 730                        /* Only change unicasts */
 731                        if (!(is_multicast_ether_addr(f->eth_addr) ||
 732                             is_zero_ether_addr(f->eth_addr))) {
 733                                notify |= vxlan_fdb_replace(f, ip, port, vni,
 734                                                           ifindex);
 735                        } else
 736                                return -EOPNOTSUPP;
 737                }
 738                if ((flags & NLM_F_APPEND) &&
 739                    (is_multicast_ether_addr(f->eth_addr) ||
 740                     is_zero_ether_addr(f->eth_addr))) {
 741                        int rc = vxlan_fdb_append(f, ip, port, vni, ifindex,
 742                                                  &rd);
 743
 744                        if (rc < 0)
 745                                return rc;
 746                        notify |= rc;
 747                }
 748        } else {
 749                if (!(flags & NLM_F_CREATE))
 750                        return -ENOENT;
 751
 752                if (vxlan->addrmax && vxlan->addrcnt >= vxlan->addrmax)
 753                        return -ENOSPC;
 754
 755                /* Disallow replace to add a multicast entry */
 756                if ((flags & NLM_F_REPLACE) &&
 757                    (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
 758                        return -EOPNOTSUPP;
 759
 760                netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
 761                f = kmalloc(sizeof(*f), GFP_ATOMIC);
 762                if (!f)
 763                        return -ENOMEM;
 764
 765                notify = 1;
 766                f->state = state;
 767                f->flags = ndm_flags;
 768                f->updated = f->used = jiffies;
 769                INIT_LIST_HEAD(&f->remotes);
 770                memcpy(f->eth_addr, mac, ETH_ALEN);
 771
 772                vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
 773
 774                ++vxlan->addrcnt;
 775                hlist_add_head_rcu(&f->hlist,
 776                                   vxlan_fdb_head(vxlan, mac));
 777        }
 778
 779        if (notify) {
 780                if (rd == NULL)
 781                        rd = first_remote_rtnl(f);
 782                vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
 783        }
 784
 785        return 0;
 786}
 787
 788static void vxlan_fdb_free(struct rcu_head *head)
 789{
 790        struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
 791        struct vxlan_rdst *rd, *nd;
 792
 793        list_for_each_entry_safe(rd, nd, &f->remotes, list)
 794                kfree(rd);
 795        kfree(f);
 796}
 797
 798static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
 799{
 800        netdev_dbg(vxlan->dev,
 801                    "delete %pM\n", f->eth_addr);
 802
 803        --vxlan->addrcnt;
 804        vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
 805
 806        hlist_del_rcu(&f->hlist);
 807        call_rcu(&f->rcu, vxlan_fdb_free);
 808}
 809
 810static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
 811                           union vxlan_addr *ip, __be16 *port, u32 *vni, u32 *ifindex)
 812{
 813        struct net *net = dev_net(vxlan->dev);
 814        int err;
 815
 816        if (tb[NDA_DST]) {
 817                err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
 818                if (err)
 819                        return err;
 820        } else {
 821                union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
 822                if (remote->sa.sa_family == AF_INET) {
 823                        ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
 824                        ip->sa.sa_family = AF_INET;
 825#if IS_ENABLED(CONFIG_IPV6)
 826                } else {
 827                        ip->sin6.sin6_addr = in6addr_any;
 828                        ip->sa.sa_family = AF_INET6;
 829#endif
 830                }
 831        }
 832
 833        if (tb[NDA_PORT]) {
 834                if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
 835                        return -EINVAL;
 836                *port = nla_get_be16(tb[NDA_PORT]);
 837        } else {
 838                *port = vxlan->dst_port;
 839        }
 840
 841        if (tb[NDA_VNI]) {
 842                if (nla_len(tb[NDA_VNI]) != sizeof(u32))
 843                        return -EINVAL;
 844                *vni = nla_get_u32(tb[NDA_VNI]);
 845        } else {
 846                *vni = vxlan->default_dst.remote_vni;
 847        }
 848
 849        if (tb[NDA_IFINDEX]) {
 850                struct net_device *tdev;
 851
 852                if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
 853                        return -EINVAL;
 854                *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
 855                tdev = __dev_get_by_index(net, *ifindex);
 856                if (!tdev)
 857                        return -EADDRNOTAVAIL;
 858        } else {
 859                *ifindex = 0;
 860        }
 861
 862        return 0;
 863}
 864
 865/* Add static entry (via netlink) */
 866static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 867                         struct net_device *dev,
 868                         const unsigned char *addr, u16 vid, u16 flags)
 869{
 870        struct vxlan_dev *vxlan = netdev_priv(dev);
 871        /* struct net *net = dev_net(vxlan->dev); */
 872        union vxlan_addr ip;
 873        __be16 port;
 874        u32 vni, ifindex;
 875        int err;
 876
 877        if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
 878                pr_info("RTM_NEWNEIGH with invalid state %#x\n",
 879                        ndm->ndm_state);
 880                return -EINVAL;
 881        }
 882
 883        if (tb[NDA_DST] == NULL)
 884                return -EINVAL;
 885
 886        err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
 887        if (err)
 888                return err;
 889
 890        if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
 891                return -EAFNOSUPPORT;
 892
 893        spin_lock_bh(&vxlan->hash_lock);
 894        err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
 895                               port, vni, ifindex, ndm->ndm_flags);
 896        spin_unlock_bh(&vxlan->hash_lock);
 897
 898        return err;
 899}
 900
 901/* Delete entry (via netlink) */
 902static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 903                            struct net_device *dev,
 904                            const unsigned char *addr, u16 vid)
 905{
 906        struct vxlan_dev *vxlan = netdev_priv(dev);
 907        struct vxlan_fdb *f;
 908        struct vxlan_rdst *rd = NULL;
 909        union vxlan_addr ip;
 910        __be16 port;
 911        u32 vni, ifindex;
 912        int err;
 913
 914        err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
 915        if (err)
 916                return err;
 917
 918        err = -ENOENT;
 919
 920        spin_lock_bh(&vxlan->hash_lock);
 921        f = vxlan_find_mac(vxlan, addr);
 922        if (!f)
 923                goto out;
 924
 925        if (!vxlan_addr_any(&ip)) {
 926                rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
 927                if (!rd)
 928                        goto out;
 929        }
 930
 931        err = 0;
 932
 933        /* remove a destination if it's not the only one on the list,
 934         * otherwise destroy the fdb entry
 935         */
 936        if (rd && !list_is_singular(&f->remotes)) {
 937                list_del_rcu(&rd->list);
 938                vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
 939                kfree_rcu(rd, rcu);
 940                goto out;
 941        }
 942
 943        vxlan_fdb_destroy(vxlan, f);
 944
 945out:
 946        spin_unlock_bh(&vxlan->hash_lock);
 947
 948        return err;
 949}
 950
 951/* Dump forwarding table */
 952static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 953                          struct net_device *dev,
 954                          struct net_device *filter_dev, int idx)
 955{
 956        struct vxlan_dev *vxlan = netdev_priv(dev);
 957        unsigned int h;
 958
 959        for (h = 0; h < FDB_HASH_SIZE; ++h) {
 960                struct vxlan_fdb *f;
 961                int err;
 962
 963                hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
 964                        struct vxlan_rdst *rd;
 965
 966                        if (idx < cb->args[0])
 967                                goto skip;
 968
 969                        list_for_each_entry_rcu(rd, &f->remotes, list) {
 970                                err = vxlan_fdb_info(skb, vxlan, f,
 971                                                     NETLINK_CB(cb->skb).portid,
 972                                                     cb->nlh->nlmsg_seq,
 973                                                     RTM_NEWNEIGH,
 974                                                     NLM_F_MULTI, rd);
 975                                if (err < 0)
 976                                        goto out;
 977                        }
 978skip:
 979                        ++idx;
 980                }
 981        }
 982out:
 983        return idx;
 984}
 985
 986/* Watch incoming packets to learn mapping between Ethernet address
 987 * and Tunnel endpoint.
 988 * Return true if packet is bogus and should be dropped.
 989 */
 990static bool vxlan_snoop(struct net_device *dev,
 991                        union vxlan_addr *src_ip, const u8 *src_mac)
 992{
 993        struct vxlan_dev *vxlan = netdev_priv(dev);
 994        struct vxlan_fdb *f;
 995
 996        f = vxlan_find_mac(vxlan, src_mac);
 997        if (likely(f)) {
 998                struct vxlan_rdst *rdst = first_remote_rcu(f);
 999
1000                if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
1001                        return false;
1002
1003                /* Don't migrate static entries, drop packets */
1004                if (f->state & NUD_NOARP)
1005                        return true;
1006
1007                if (net_ratelimit())
1008                        netdev_info(dev,
1009                                    "%pM migrated from %pIS to %pIS\n",
1010                                    src_mac, &rdst->remote_ip.sa, &src_ip->sa);
1011
1012                rdst->remote_ip = *src_ip;
1013                f->updated = jiffies;
1014                vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
1015        } else {
1016                /* learned new entry */
1017                spin_lock(&vxlan->hash_lock);
1018
1019                /* close off race between vxlan_flush and incoming packets */
1020                if (netif_running(dev))
1021                        vxlan_fdb_create(vxlan, src_mac, src_ip,
1022                                         NUD_REACHABLE,
1023                                         NLM_F_EXCL|NLM_F_CREATE,
1024                                         vxlan->dst_port,
1025                                         vxlan->default_dst.remote_vni,
1026                                         0, NTF_SELF);
1027                spin_unlock(&vxlan->hash_lock);
1028        }
1029
1030        return false;
1031}
1032
1033/* See if multicast group is already in use by other ID */
1034static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
1035{
1036        struct vxlan_dev *vxlan;
1037
1038        /* The vxlan_sock is only used by dev, leaving group has
1039         * no effect on other vxlan devices.
1040         */
1041        if (atomic_read(&dev->vn_sock->refcnt) == 1)
1042                return false;
1043
1044        list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1045                if (!netif_running(vxlan->dev) || vxlan == dev)
1046                        continue;
1047
1048                if (vxlan->vn_sock != dev->vn_sock)
1049                        continue;
1050
1051                if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1052                                      &dev->default_dst.remote_ip))
1053                        continue;
1054
1055                if (vxlan->default_dst.remote_ifindex !=
1056                    dev->default_dst.remote_ifindex)
1057                        continue;
1058
1059                return true;
1060        }
1061
1062        return false;
1063}
1064
1065void vxlan_sock_release(struct vxlan_sock *vs)
1066{
1067        struct sock *sk = vs->sock->sk;
1068        struct net *net = sock_net(sk);
1069        struct vxlan_net *vn = net_generic(net, vxlan_net_id);
1070
1071        if (!atomic_dec_and_test(&vs->refcnt))
1072                return;
1073
1074        spin_lock(&vn->sock_lock);
1075        hlist_del_rcu(&vs->hlist);
1076        vxlan_notify_del_rx_port(vs);
1077        spin_unlock(&vn->sock_lock);
1078
1079        queue_work(vxlan_wq, &vs->del_work);
1080}
1081EXPORT_SYMBOL_GPL(vxlan_sock_release);
1082
1083/* Update multicast group membership when first VNI on
1084 * multicast address is brought up
1085 */
1086static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1087{
1088        struct vxlan_sock *vs = vxlan->vn_sock;
1089        struct sock *sk = vs->sock->sk;
1090        union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1091        int ifindex = vxlan->default_dst.remote_ifindex;
1092        int ret = -EINVAL;
1093
1094        lock_sock(sk);
1095        if (ip->sa.sa_family == AF_INET) {
1096                struct ip_mreqn mreq = {
1097                        .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1098                        .imr_ifindex            = ifindex,
1099                };
1100
1101                ret = ip_mc_join_group(sk, &mreq);
1102#if IS_ENABLED(CONFIG_IPV6)
1103        } else {
1104                ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1105                                                   &ip->sin6.sin6_addr);
1106#endif
1107        }
1108        release_sock(sk);
1109
1110        return ret;
1111}
1112
1113/* Inverse of vxlan_igmp_join when last VNI is brought down */
1114static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1115{
1116        struct vxlan_sock *vs = vxlan->vn_sock;
1117        struct sock *sk = vs->sock->sk;
1118        union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1119        int ifindex = vxlan->default_dst.remote_ifindex;
1120        int ret = -EINVAL;
1121
1122        lock_sock(sk);
1123        if (ip->sa.sa_family == AF_INET) {
1124                struct ip_mreqn mreq = {
1125                        .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1126                        .imr_ifindex            = ifindex,
1127                };
1128
1129                ret = ip_mc_leave_group(sk, &mreq);
1130#if IS_ENABLED(CONFIG_IPV6)
1131        } else {
1132                ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1133                                                   &ip->sin6.sin6_addr);
1134#endif
1135        }
1136        release_sock(sk);
1137
1138        return ret;
1139}
1140
1141static struct vxlanhdr *vxlan_remcsum(struct sk_buff *skb, struct vxlanhdr *vh,
1142                                      size_t hdrlen, u32 data, bool nopartial)
1143{
1144        size_t start, offset, plen;
1145
1146        start = (data & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
1147        offset = start + ((data & VXLAN_RCO_UDP) ?
1148                          offsetof(struct udphdr, check) :
1149                          offsetof(struct tcphdr, check));
1150
1151        plen = hdrlen + offset + sizeof(u16);
1152
1153        if (!pskb_may_pull(skb, plen))
1154                return NULL;
1155
1156        vh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1157
1158        skb_remcsum_process(skb, (void *)vh + hdrlen, start, offset,
1159                            nopartial);
1160
1161        return vh;
1162}
1163
1164/* Callback from net/ipv4/udp.c to receive packets */
1165static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
1166{
1167        struct vxlan_sock *vs;
1168        struct vxlanhdr *vxh;
1169        u32 flags, vni;
1170        struct vxlan_metadata md = {0};
1171
1172        /* Need Vxlan and inner Ethernet header to be present */
1173        if (!pskb_may_pull(skb, VXLAN_HLEN))
1174                goto error;
1175
1176        vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1177        flags = ntohl(vxh->vx_flags);
1178        vni = ntohl(vxh->vx_vni);
1179
1180        if (flags & VXLAN_HF_VNI) {
1181                flags &= ~VXLAN_HF_VNI;
1182        } else {
1183                /* VNI flag always required to be set */
1184                goto bad_flags;
1185        }
1186
1187        if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB)))
1188                goto drop;
1189        vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1190
1191        vs = rcu_dereference_sk_user_data(sk);
1192        if (!vs)
1193                goto drop;
1194
1195        if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
1196                vxh = vxlan_remcsum(skb, vxh, sizeof(struct vxlanhdr), vni,
1197                                    !!(vs->flags & VXLAN_F_REMCSUM_NOPARTIAL));
1198                if (!vxh)
1199                        goto drop;
1200
1201                flags &= ~VXLAN_HF_RCO;
1202                vni &= VXLAN_VNI_MASK;
1203        }
1204
1205        /* For backwards compatibility, only allow reserved fields to be
1206         * used by VXLAN extensions if explicitly requested.
1207         */
1208        if ((flags & VXLAN_HF_GBP) && (vs->flags & VXLAN_F_GBP)) {
1209                struct vxlanhdr_gbp *gbp;
1210
1211                gbp = (struct vxlanhdr_gbp *)vxh;
1212                md.gbp = ntohs(gbp->policy_id);
1213
1214                if (gbp->dont_learn)
1215                        md.gbp |= VXLAN_GBP_DONT_LEARN;
1216
1217                if (gbp->policy_applied)
1218                        md.gbp |= VXLAN_GBP_POLICY_APPLIED;
1219
1220                flags &= ~VXLAN_GBP_USED_BITS;
1221        }
1222
1223        if (flags || vni & ~VXLAN_VNI_MASK) {
1224                /* If there are any unprocessed flags remaining treat
1225                 * this as a malformed packet. This behavior diverges from
1226                 * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1227                 * in reserved fields are to be ignored. The approach here
1228                 * maintains compatibility with previous stack code, and also
1229                 * is more robust and provides a little more security in
1230                 * adding extensions to VXLAN.
1231                 */
1232
1233                goto bad_flags;
1234        }
1235
1236        md.vni = vxh->vx_vni;
1237        vs->rcv(vs, skb, &md);
1238        return 0;
1239
1240drop:
1241        /* Consume bad packet */
1242        kfree_skb(skb);
1243        return 0;
1244
1245bad_flags:
1246        netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1247                   ntohl(vxh->vx_flags), ntohl(vxh->vx_vni));
1248
1249error:
1250        /* Return non vxlan pkt */
1251        return 1;
1252}
1253
1254static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb,
1255                      struct vxlan_metadata *md)
1256{
1257        struct iphdr *oip = NULL;
1258        struct ipv6hdr *oip6 = NULL;
1259        struct vxlan_dev *vxlan;
1260        struct pcpu_sw_netstats *stats;
1261        union vxlan_addr saddr;
1262        __u32 vni;
1263        int err = 0;
1264        union vxlan_addr *remote_ip;
1265
1266        vni = ntohl(md->vni) >> 8;
1267        /* Is this VNI defined? */
1268        vxlan = vxlan_vs_find_vni(vs, vni);
1269        if (!vxlan)
1270                goto drop;
1271
1272        remote_ip = &vxlan->default_dst.remote_ip;
1273        skb_reset_mac_header(skb);
1274        skb_scrub_packet(skb, !net_eq(vxlan->net, dev_net(vxlan->dev)));
1275        skb->protocol = eth_type_trans(skb, vxlan->dev);
1276        skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1277
1278        /* Ignore packet loops (and multicast echo) */
1279        if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1280                goto drop;
1281
1282        /* Re-examine inner Ethernet packet */
1283        if (remote_ip->sa.sa_family == AF_INET) {
1284                oip = ip_hdr(skb);
1285                saddr.sin.sin_addr.s_addr = oip->saddr;
1286                saddr.sa.sa_family = AF_INET;
1287#if IS_ENABLED(CONFIG_IPV6)
1288        } else {
1289                oip6 = ipv6_hdr(skb);
1290                saddr.sin6.sin6_addr = oip6->saddr;
1291                saddr.sa.sa_family = AF_INET6;
1292#endif
1293        }
1294
1295        if ((vxlan->flags & VXLAN_F_LEARN) &&
1296            vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
1297                goto drop;
1298
1299        skb_reset_network_header(skb);
1300        skb->mark = md->gbp;
1301
1302        if (oip6)
1303                err = IP6_ECN_decapsulate(oip6, skb);
1304        if (oip)
1305                err = IP_ECN_decapsulate(oip, skb);
1306
1307        if (unlikely(err)) {
1308                if (log_ecn_error) {
1309                        if (oip6)
1310                                net_info_ratelimited("non-ECT from %pI6\n",
1311                                                     &oip6->saddr);
1312                        if (oip)
1313                                net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1314                                                     &oip->saddr, oip->tos);
1315                }
1316                if (err > 1) {
1317                        ++vxlan->dev->stats.rx_frame_errors;
1318                        ++vxlan->dev->stats.rx_errors;
1319                        goto drop;
1320                }
1321        }
1322
1323        stats = this_cpu_ptr(vxlan->dev->tstats);
1324        u64_stats_update_begin(&stats->syncp);
1325        stats->rx_packets++;
1326        stats->rx_bytes += skb->len;
1327        u64_stats_update_end(&stats->syncp);
1328
1329        netif_rx(skb);
1330
1331        return;
1332drop:
1333        /* Consume bad packet */
1334        kfree_skb(skb);
1335}
1336
1337static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1338{
1339        struct vxlan_dev *vxlan = netdev_priv(dev);
1340        struct arphdr *parp;
1341        u8 *arpptr, *sha;
1342        __be32 sip, tip;
1343        struct neighbour *n;
1344
1345        if (dev->flags & IFF_NOARP)
1346                goto out;
1347
1348        if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1349                dev->stats.tx_dropped++;
1350                goto out;
1351        }
1352        parp = arp_hdr(skb);
1353
1354        if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1355             parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1356            parp->ar_pro != htons(ETH_P_IP) ||
1357            parp->ar_op != htons(ARPOP_REQUEST) ||
1358            parp->ar_hln != dev->addr_len ||
1359            parp->ar_pln != 4)
1360                goto out;
1361        arpptr = (u8 *)parp + sizeof(struct arphdr);
1362        sha = arpptr;
1363        arpptr += dev->addr_len;        /* sha */
1364        memcpy(&sip, arpptr, sizeof(sip));
1365        arpptr += sizeof(sip);
1366        arpptr += dev->addr_len;        /* tha */
1367        memcpy(&tip, arpptr, sizeof(tip));
1368
1369        if (ipv4_is_loopback(tip) ||
1370            ipv4_is_multicast(tip))
1371                goto out;
1372
1373        n = neigh_lookup(&arp_tbl, &tip, dev);
1374
1375        if (n) {
1376                struct vxlan_fdb *f;
1377                struct sk_buff  *reply;
1378
1379                if (!(n->nud_state & NUD_CONNECTED)) {
1380                        neigh_release(n);
1381                        goto out;
1382                }
1383
1384                f = vxlan_find_mac(vxlan, n->ha);
1385                if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1386                        /* bridge-local neighbor */
1387                        neigh_release(n);
1388                        goto out;
1389                }
1390
1391                reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1392                                n->ha, sha);
1393
1394                neigh_release(n);
1395
1396                if (reply == NULL)
1397                        goto out;
1398
1399                skb_reset_mac_header(reply);
1400                __skb_pull(reply, skb_network_offset(reply));
1401                reply->ip_summed = CHECKSUM_UNNECESSARY;
1402                reply->pkt_type = PACKET_HOST;
1403
1404                if (netif_rx_ni(reply) == NET_RX_DROP)
1405                        dev->stats.rx_dropped++;
1406        } else if (vxlan->flags & VXLAN_F_L3MISS) {
1407                union vxlan_addr ipa = {
1408                        .sin.sin_addr.s_addr = tip,
1409                        .sin.sin_family = AF_INET,
1410                };
1411
1412                vxlan_ip_miss(dev, &ipa);
1413        }
1414out:
1415        consume_skb(skb);
1416        return NETDEV_TX_OK;
1417}
1418
1419#if IS_ENABLED(CONFIG_IPV6)
1420static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1421        struct neighbour *n, bool isrouter)
1422{
1423        struct net_device *dev = request->dev;
1424        struct sk_buff *reply;
1425        struct nd_msg *ns, *na;
1426        struct ipv6hdr *pip6;
1427        u8 *daddr;
1428        int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1429        int ns_olen;
1430        int i, len;
1431
1432        if (dev == NULL)
1433                return NULL;
1434
1435        len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1436                sizeof(*na) + na_olen + dev->needed_tailroom;
1437        reply = alloc_skb(len, GFP_ATOMIC);
1438        if (reply == NULL)
1439                return NULL;
1440
1441        reply->protocol = htons(ETH_P_IPV6);
1442        reply->dev = dev;
1443        skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1444        skb_push(reply, sizeof(struct ethhdr));
1445        skb_set_mac_header(reply, 0);
1446
1447        ns = (struct nd_msg *)skb_transport_header(request);
1448
1449        daddr = eth_hdr(request)->h_source;
1450        ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
1451        for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1452                if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1453                        daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1454                        break;
1455                }
1456        }
1457
1458        /* Ethernet header */
1459        ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1460        ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1461        eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1462        reply->protocol = htons(ETH_P_IPV6);
1463
1464        skb_pull(reply, sizeof(struct ethhdr));
1465        skb_set_network_header(reply, 0);
1466        skb_put(reply, sizeof(struct ipv6hdr));
1467
1468        /* IPv6 header */
1469
1470        pip6 = ipv6_hdr(reply);
1471        memset(pip6, 0, sizeof(struct ipv6hdr));
1472        pip6->version = 6;
1473        pip6->priority = ipv6_hdr(request)->priority;
1474        pip6->nexthdr = IPPROTO_ICMPV6;
1475        pip6->hop_limit = 255;
1476        pip6->daddr = ipv6_hdr(request)->saddr;
1477        pip6->saddr = *(struct in6_addr *)n->primary_key;
1478
1479        skb_pull(reply, sizeof(struct ipv6hdr));
1480        skb_set_transport_header(reply, 0);
1481
1482        na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1483
1484        /* Neighbor Advertisement */
1485        memset(na, 0, sizeof(*na)+na_olen);
1486        na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1487        na->icmph.icmp6_router = isrouter;
1488        na->icmph.icmp6_override = 1;
1489        na->icmph.icmp6_solicited = 1;
1490        na->target = ns->target;
1491        ether_addr_copy(&na->opt[2], n->ha);
1492        na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1493        na->opt[1] = na_olen >> 3;
1494
1495        na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1496                &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1497                csum_partial(na, sizeof(*na)+na_olen, 0));
1498
1499        pip6->payload_len = htons(sizeof(*na)+na_olen);
1500
1501        skb_push(reply, sizeof(struct ipv6hdr));
1502
1503        reply->ip_summed = CHECKSUM_UNNECESSARY;
1504
1505        return reply;
1506}
1507
1508static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1509{
1510        struct vxlan_dev *vxlan = netdev_priv(dev);
1511        struct nd_msg *msg;
1512        const struct ipv6hdr *iphdr;
1513        const struct in6_addr *saddr, *daddr;
1514        struct neighbour *n;
1515        struct inet6_dev *in6_dev;
1516
1517        in6_dev = __in6_dev_get(dev);
1518        if (!in6_dev)
1519                goto out;
1520
1521        iphdr = ipv6_hdr(skb);
1522        saddr = &iphdr->saddr;
1523        daddr = &iphdr->daddr;
1524
1525        msg = (struct nd_msg *)skb_transport_header(skb);
1526        if (msg->icmph.icmp6_code != 0 ||
1527            msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1528                goto out;
1529
1530        if (ipv6_addr_loopback(daddr) ||
1531            ipv6_addr_is_multicast(&msg->target))
1532                goto out;
1533
1534        n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1535
1536        if (n) {
1537                struct vxlan_fdb *f;
1538                struct sk_buff *reply;
1539
1540                if (!(n->nud_state & NUD_CONNECTED)) {
1541                        neigh_release(n);
1542                        goto out;
1543                }
1544
1545                f = vxlan_find_mac(vxlan, n->ha);
1546                if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1547                        /* bridge-local neighbor */
1548                        neigh_release(n);
1549                        goto out;
1550                }
1551
1552                reply = vxlan_na_create(skb, n,
1553                                        !!(f ? f->flags & NTF_ROUTER : 0));
1554
1555                neigh_release(n);
1556
1557                if (reply == NULL)
1558                        goto out;
1559
1560                if (netif_rx_ni(reply) == NET_RX_DROP)
1561                        dev->stats.rx_dropped++;
1562
1563        } else if (vxlan->flags & VXLAN_F_L3MISS) {
1564                union vxlan_addr ipa = {
1565                        .sin6.sin6_addr = msg->target,
1566                        .sin6.sin6_family = AF_INET6,
1567                };
1568
1569                vxlan_ip_miss(dev, &ipa);
1570        }
1571
1572out:
1573        consume_skb(skb);
1574        return NETDEV_TX_OK;
1575}
1576#endif
1577
1578static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1579{
1580        struct vxlan_dev *vxlan = netdev_priv(dev);
1581        struct neighbour *n;
1582
1583        if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1584                return false;
1585
1586        n = NULL;
1587        switch (ntohs(eth_hdr(skb)->h_proto)) {
1588        case ETH_P_IP:
1589        {
1590                struct iphdr *pip;
1591
1592                if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1593                        return false;
1594                pip = ip_hdr(skb);
1595                n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1596                if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1597                        union vxlan_addr ipa = {
1598                                .sin.sin_addr.s_addr = pip->daddr,
1599                                .sin.sin_family = AF_INET,
1600                        };
1601
1602                        vxlan_ip_miss(dev, &ipa);
1603                        return false;
1604                }
1605
1606                break;
1607        }
1608#if IS_ENABLED(CONFIG_IPV6)
1609        case ETH_P_IPV6:
1610        {
1611                struct ipv6hdr *pip6;
1612
1613                if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1614                        return false;
1615                pip6 = ipv6_hdr(skb);
1616                n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1617                if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1618                        union vxlan_addr ipa = {
1619                                .sin6.sin6_addr = pip6->daddr,
1620                                .sin6.sin6_family = AF_INET6,
1621                        };
1622
1623                        vxlan_ip_miss(dev, &ipa);
1624                        return false;
1625                }
1626
1627                break;
1628        }
1629#endif
1630        default:
1631                return false;
1632        }
1633
1634        if (n) {
1635                bool diff;
1636
1637                diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1638                if (diff) {
1639                        memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1640                                dev->addr_len);
1641                        memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1642                }
1643                neigh_release(n);
1644                return diff;
1645        }
1646
1647        return false;
1648}
1649
1650static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
1651                                struct vxlan_metadata *md)
1652{
1653        struct vxlanhdr_gbp *gbp;
1654
1655        if (!md->gbp)
1656                return;
1657
1658        gbp = (struct vxlanhdr_gbp *)vxh;
1659        vxh->vx_flags |= htonl(VXLAN_HF_GBP);
1660
1661        if (md->gbp & VXLAN_GBP_DONT_LEARN)
1662                gbp->dont_learn = 1;
1663
1664        if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1665                gbp->policy_applied = 1;
1666
1667        gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1668}
1669
1670#if IS_ENABLED(CONFIG_IPV6)
1671static int vxlan6_xmit_skb(struct dst_entry *dst, struct sock *sk,
1672                           struct sk_buff *skb,
1673                           struct net_device *dev, struct in6_addr *saddr,
1674                           struct in6_addr *daddr, __u8 prio, __u8 ttl,
1675                           __be16 src_port, __be16 dst_port,
1676                           struct vxlan_metadata *md, bool xnet, u32 vxflags)
1677{
1678        struct vxlanhdr *vxh;
1679        int min_headroom;
1680        int err;
1681        bool udp_sum = !(vxflags & VXLAN_F_UDP_ZERO_CSUM6_TX);
1682        int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1683        u16 hdrlen = sizeof(struct vxlanhdr);
1684
1685        if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1686            skb->ip_summed == CHECKSUM_PARTIAL) {
1687                int csum_start = skb_checksum_start_offset(skb);
1688
1689                if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1690                    !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1691                    (skb->csum_offset == offsetof(struct udphdr, check) ||
1692                     skb->csum_offset == offsetof(struct tcphdr, check))) {
1693                        udp_sum = false;
1694                        type |= SKB_GSO_TUNNEL_REMCSUM;
1695                }
1696        }
1697
1698        skb_scrub_packet(skb, xnet);
1699
1700        min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1701                        + VXLAN_HLEN + sizeof(struct ipv6hdr)
1702                        + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1703
1704        /* Need space for new headers (invalidates iph ptr) */
1705        err = skb_cow_head(skb, min_headroom);
1706        if (unlikely(err)) {
1707                kfree_skb(skb);
1708                goto err;
1709        }
1710
1711        skb = vlan_hwaccel_push_inside(skb);
1712        if (WARN_ON(!skb)) {
1713                err = -ENOMEM;
1714                goto err;
1715        }
1716
1717        skb = iptunnel_handle_offloads(skb, udp_sum, type);
1718        if (IS_ERR(skb)) {
1719                err = -EINVAL;
1720                goto err;
1721        }
1722
1723        vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1724        vxh->vx_flags = htonl(VXLAN_HF_VNI);
1725        vxh->vx_vni = md->vni;
1726
1727        if (type & SKB_GSO_TUNNEL_REMCSUM) {
1728                u32 data = (skb_checksum_start_offset(skb) - hdrlen) >>
1729                           VXLAN_RCO_SHIFT;
1730
1731                if (skb->csum_offset == offsetof(struct udphdr, check))
1732                        data |= VXLAN_RCO_UDP;
1733
1734                vxh->vx_vni |= htonl(data);
1735                vxh->vx_flags |= htonl(VXLAN_HF_RCO);
1736
1737                if (!skb_is_gso(skb)) {
1738                        skb->ip_summed = CHECKSUM_NONE;
1739                        skb->encapsulation = 0;
1740                }
1741        }
1742
1743        if (vxflags & VXLAN_F_GBP)
1744                vxlan_build_gbp_hdr(vxh, vxflags, md);
1745
1746        skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1747
1748        udp_tunnel6_xmit_skb(dst, sk, skb, dev, saddr, daddr, prio,
1749                             ttl, src_port, dst_port,
1750                             !!(vxflags & VXLAN_F_UDP_ZERO_CSUM6_TX));
1751        return 0;
1752err:
1753        dst_release(dst);
1754        return err;
1755}
1756#endif
1757
1758int vxlan_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb,
1759                   __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
1760                   __be16 src_port, __be16 dst_port,
1761                   struct vxlan_metadata *md, bool xnet, u32 vxflags)
1762{
1763        struct vxlanhdr *vxh;
1764        int min_headroom;
1765        int err;
1766        bool udp_sum = !!(vxflags & VXLAN_F_UDP_CSUM);
1767        int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1768        u16 hdrlen = sizeof(struct vxlanhdr);
1769
1770        if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1771            skb->ip_summed == CHECKSUM_PARTIAL) {
1772                int csum_start = skb_checksum_start_offset(skb);
1773
1774                if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1775                    !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1776                    (skb->csum_offset == offsetof(struct udphdr, check) ||
1777                     skb->csum_offset == offsetof(struct tcphdr, check))) {
1778                        udp_sum = false;
1779                        type |= SKB_GSO_TUNNEL_REMCSUM;
1780                }
1781        }
1782
1783        min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
1784                        + VXLAN_HLEN + sizeof(struct iphdr)
1785                        + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1786
1787        /* Need space for new headers (invalidates iph ptr) */
1788        err = skb_cow_head(skb, min_headroom);
1789        if (unlikely(err)) {
1790                kfree_skb(skb);
1791                return err;
1792        }
1793
1794        skb = vlan_hwaccel_push_inside(skb);
1795        if (WARN_ON(!skb))
1796                return -ENOMEM;
1797
1798        skb = iptunnel_handle_offloads(skb, udp_sum, type);
1799        if (IS_ERR(skb))
1800                return PTR_ERR(skb);
1801
1802        vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1803        vxh->vx_flags = htonl(VXLAN_HF_VNI);
1804        vxh->vx_vni = md->vni;
1805
1806        if (type & SKB_GSO_TUNNEL_REMCSUM) {
1807                u32 data = (skb_checksum_start_offset(skb) - hdrlen) >>
1808                           VXLAN_RCO_SHIFT;
1809
1810                if (skb->csum_offset == offsetof(struct udphdr, check))
1811                        data |= VXLAN_RCO_UDP;
1812
1813                vxh->vx_vni |= htonl(data);
1814                vxh->vx_flags |= htonl(VXLAN_HF_RCO);
1815
1816                if (!skb_is_gso(skb)) {
1817                        skb->ip_summed = CHECKSUM_NONE;
1818                        skb->encapsulation = 0;
1819                }
1820        }
1821
1822        if (vxflags & VXLAN_F_GBP)
1823                vxlan_build_gbp_hdr(vxh, vxflags, md);
1824
1825        skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1826
1827        return udp_tunnel_xmit_skb(rt, sk, skb, src, dst, tos,
1828                                   ttl, df, src_port, dst_port, xnet,
1829                                   !(vxflags & VXLAN_F_UDP_CSUM));
1830}
1831EXPORT_SYMBOL_GPL(vxlan_xmit_skb);
1832
1833/* Bypass encapsulation if the destination is local */
1834static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1835                               struct vxlan_dev *dst_vxlan)
1836{
1837        struct pcpu_sw_netstats *tx_stats, *rx_stats;
1838        union vxlan_addr loopback;
1839        union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1840        struct net_device *dev = skb->dev;
1841        int len = skb->len;
1842
1843        tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1844        rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1845        skb->pkt_type = PACKET_HOST;
1846        skb->encapsulation = 0;
1847        skb->dev = dst_vxlan->dev;
1848        __skb_pull(skb, skb_network_offset(skb));
1849
1850        if (remote_ip->sa.sa_family == AF_INET) {
1851                loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1852                loopback.sa.sa_family =  AF_INET;
1853#if IS_ENABLED(CONFIG_IPV6)
1854        } else {
1855                loopback.sin6.sin6_addr = in6addr_loopback;
1856                loopback.sa.sa_family =  AF_INET6;
1857#endif
1858        }
1859
1860        if (dst_vxlan->flags & VXLAN_F_LEARN)
1861                vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
1862
1863        u64_stats_update_begin(&tx_stats->syncp);
1864        tx_stats->tx_packets++;
1865        tx_stats->tx_bytes += len;
1866        u64_stats_update_end(&tx_stats->syncp);
1867
1868        if (netif_rx(skb) == NET_RX_SUCCESS) {
1869                u64_stats_update_begin(&rx_stats->syncp);
1870                rx_stats->rx_packets++;
1871                rx_stats->rx_bytes += len;
1872                u64_stats_update_end(&rx_stats->syncp);
1873        } else {
1874                dev->stats.rx_dropped++;
1875        }
1876}
1877
1878static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1879                           struct vxlan_rdst *rdst, bool did_rsc)
1880{
1881        struct vxlan_dev *vxlan = netdev_priv(dev);
1882        struct sock *sk = vxlan->vn_sock->sock->sk;
1883        struct rtable *rt = NULL;
1884        const struct iphdr *old_iph;
1885        struct flowi4 fl4;
1886        union vxlan_addr *dst;
1887        struct vxlan_metadata md;
1888        __be16 src_port = 0, dst_port;
1889        u32 vni;
1890        __be16 df = 0;
1891        __u8 tos, ttl;
1892        int err;
1893
1894        dst_port = rdst->remote_port ? rdst->remote_port : vxlan->dst_port;
1895        vni = rdst->remote_vni;
1896        dst = &rdst->remote_ip;
1897
1898        if (vxlan_addr_any(dst)) {
1899                if (did_rsc) {
1900                        /* short-circuited back to local bridge */
1901                        vxlan_encap_bypass(skb, vxlan, vxlan);
1902                        return;
1903                }
1904                goto drop;
1905        }
1906
1907        old_iph = ip_hdr(skb);
1908
1909        ttl = vxlan->ttl;
1910        if (!ttl && vxlan_addr_multicast(dst))
1911                ttl = 1;
1912
1913        tos = vxlan->tos;
1914        if (tos == 1)
1915                tos = ip_tunnel_get_dsfield(old_iph, skb);
1916
1917        src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->port_min,
1918                                     vxlan->port_max, true);
1919
1920        if (dst->sa.sa_family == AF_INET) {
1921                memset(&fl4, 0, sizeof(fl4));
1922                fl4.flowi4_oif = rdst->remote_ifindex;
1923                fl4.flowi4_tos = RT_TOS(tos);
1924                fl4.flowi4_mark = skb->mark;
1925                fl4.flowi4_proto = IPPROTO_UDP;
1926                fl4.daddr = dst->sin.sin_addr.s_addr;
1927                fl4.saddr = vxlan->saddr.sin.sin_addr.s_addr;
1928
1929                rt = ip_route_output_key(vxlan->net, &fl4);
1930                if (IS_ERR(rt)) {
1931                        netdev_dbg(dev, "no route to %pI4\n",
1932                                   &dst->sin.sin_addr.s_addr);
1933                        dev->stats.tx_carrier_errors++;
1934                        goto tx_error;
1935                }
1936
1937                if (rt->dst.dev == dev) {
1938                        netdev_dbg(dev, "circular route to %pI4\n",
1939                                   &dst->sin.sin_addr.s_addr);
1940                        dev->stats.collisions++;
1941                        goto rt_tx_error;
1942                }
1943
1944                /* Bypass encapsulation if the destination is local */
1945                if (rt->rt_flags & RTCF_LOCAL &&
1946                    !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1947                        struct vxlan_dev *dst_vxlan;
1948
1949                        ip_rt_put(rt);
1950                        dst_vxlan = vxlan_find_vni(vxlan->net, vni,
1951                                                   dst->sa.sa_family, dst_port,
1952                                                   vxlan->flags);
1953                        if (!dst_vxlan)
1954                                goto tx_error;
1955                        vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1956                        return;
1957                }
1958
1959                tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
1960                ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
1961                md.vni = htonl(vni << 8);
1962                md.gbp = skb->mark;
1963
1964                err = vxlan_xmit_skb(rt, sk, skb, fl4.saddr,
1965                                     dst->sin.sin_addr.s_addr, tos, ttl, df,
1966                                     src_port, dst_port, &md,
1967                                     !net_eq(vxlan->net, dev_net(vxlan->dev)),
1968                                     vxlan->flags);
1969                if (err < 0) {
1970                        /* skb is already freed. */
1971                        skb = NULL;
1972                        goto rt_tx_error;
1973                }
1974
1975                iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
1976#if IS_ENABLED(CONFIG_IPV6)
1977        } else {
1978                struct dst_entry *ndst;
1979                struct flowi6 fl6;
1980                u32 flags;
1981
1982                memset(&fl6, 0, sizeof(fl6));
1983                fl6.flowi6_oif = rdst->remote_ifindex;
1984                fl6.daddr = dst->sin6.sin6_addr;
1985                fl6.saddr = vxlan->saddr.sin6.sin6_addr;
1986                fl6.flowi6_mark = skb->mark;
1987                fl6.flowi6_proto = IPPROTO_UDP;
1988
1989                if (ipv6_stub->ipv6_dst_lookup(sk, &ndst, &fl6)) {
1990                        netdev_dbg(dev, "no route to %pI6\n",
1991                                   &dst->sin6.sin6_addr);
1992                        dev->stats.tx_carrier_errors++;
1993                        goto tx_error;
1994                }
1995
1996                if (ndst->dev == dev) {
1997                        netdev_dbg(dev, "circular route to %pI6\n",
1998                                   &dst->sin6.sin6_addr);
1999                        dst_release(ndst);
2000                        dev->stats.collisions++;
2001                        goto tx_error;
2002                }
2003
2004                /* Bypass encapsulation if the destination is local */
2005                flags = ((struct rt6_info *)ndst)->rt6i_flags;
2006                if (flags & RTF_LOCAL &&
2007                    !(flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2008                        struct vxlan_dev *dst_vxlan;
2009
2010                        dst_release(ndst);
2011                        dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2012                                                   dst->sa.sa_family, dst_port,
2013                                                   vxlan->flags);
2014                        if (!dst_vxlan)
2015                                goto tx_error;
2016                        vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2017                        return;
2018                }
2019
2020                ttl = ttl ? : ip6_dst_hoplimit(ndst);
2021                md.vni = htonl(vni << 8);
2022                md.gbp = skb->mark;
2023
2024                err = vxlan6_xmit_skb(ndst, sk, skb, dev, &fl6.saddr, &fl6.daddr,
2025                                      0, ttl, src_port, dst_port, &md,
2026                                      !net_eq(vxlan->net, dev_net(vxlan->dev)),
2027                                      vxlan->flags);
2028#endif
2029        }
2030
2031        return;
2032
2033drop:
2034        dev->stats.tx_dropped++;
2035        goto tx_free;
2036
2037rt_tx_error:
2038        ip_rt_put(rt);
2039tx_error:
2040        dev->stats.tx_errors++;
2041tx_free:
2042        dev_kfree_skb(skb);
2043}
2044
2045/* Transmit local packets over Vxlan
2046 *
2047 * Outer IP header inherits ECN and DF from inner header.
2048 * Outer UDP destination is the VXLAN assigned port.
2049 *           source port is based on hash of flow
2050 */
2051static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2052{
2053        struct vxlan_dev *vxlan = netdev_priv(dev);
2054        struct ethhdr *eth;
2055        bool did_rsc = false;
2056        struct vxlan_rdst *rdst, *fdst = NULL;
2057        struct vxlan_fdb *f;
2058
2059        skb_reset_mac_header(skb);
2060        eth = eth_hdr(skb);
2061
2062        if ((vxlan->flags & VXLAN_F_PROXY)) {
2063                if (ntohs(eth->h_proto) == ETH_P_ARP)
2064                        return arp_reduce(dev, skb);
2065#if IS_ENABLED(CONFIG_IPV6)
2066                else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2067                         pskb_may_pull(skb, sizeof(struct ipv6hdr)
2068                                       + sizeof(struct nd_msg)) &&
2069                         ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2070                                struct nd_msg *msg;
2071
2072                                msg = (struct nd_msg *)skb_transport_header(skb);
2073                                if (msg->icmph.icmp6_code == 0 &&
2074                                    msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2075                                        return neigh_reduce(dev, skb);
2076                }
2077                eth = eth_hdr(skb);
2078#endif
2079        }
2080
2081        f = vxlan_find_mac(vxlan, eth->h_dest);
2082        did_rsc = false;
2083
2084        if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
2085            (ntohs(eth->h_proto) == ETH_P_IP ||
2086             ntohs(eth->h_proto) == ETH_P_IPV6)) {
2087                did_rsc = route_shortcircuit(dev, skb);
2088                if (did_rsc)
2089                        f = vxlan_find_mac(vxlan, eth->h_dest);
2090        }
2091
2092        if (f == NULL) {
2093                f = vxlan_find_mac(vxlan, all_zeros_mac);
2094                if (f == NULL) {
2095                        if ((vxlan->flags & VXLAN_F_L2MISS) &&
2096                            !is_multicast_ether_addr(eth->h_dest))
2097                                vxlan_fdb_miss(vxlan, eth->h_dest);
2098
2099                        dev->stats.tx_dropped++;
2100                        kfree_skb(skb);
2101                        return NETDEV_TX_OK;
2102                }
2103        }
2104
2105        list_for_each_entry_rcu(rdst, &f->remotes, list) {
2106                struct sk_buff *skb1;
2107
2108                if (!fdst) {
2109                        fdst = rdst;
2110                        continue;
2111                }
2112                skb1 = skb_clone(skb, GFP_ATOMIC);
2113                if (skb1)
2114                        vxlan_xmit_one(skb1, dev, rdst, did_rsc);
2115        }
2116
2117        if (fdst)
2118                vxlan_xmit_one(skb, dev, fdst, did_rsc);
2119        else
2120                kfree_skb(skb);
2121        return NETDEV_TX_OK;
2122}
2123
2124/* Walk the forwarding table and purge stale entries */
2125static void vxlan_cleanup(unsigned long arg)
2126{
2127        struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
2128        unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2129        unsigned int h;
2130
2131        if (!netif_running(vxlan->dev))
2132                return;
2133
2134        for (h = 0; h < FDB_HASH_SIZE; ++h) {
2135                struct hlist_node *p, *n;
2136
2137                spin_lock_bh(&vxlan->hash_lock);
2138                hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2139                        struct vxlan_fdb *f
2140                                = container_of(p, struct vxlan_fdb, hlist);
2141                        unsigned long timeout;
2142
2143                        if (f->state & NUD_PERMANENT)
2144                                continue;
2145
2146                        timeout = f->used + vxlan->age_interval * HZ;
2147                        if (time_before_eq(timeout, jiffies)) {
2148                                netdev_dbg(vxlan->dev,
2149                                           "garbage collect %pM\n",
2150                                           f->eth_addr);
2151                                f->state = NUD_STALE;
2152                                vxlan_fdb_destroy(vxlan, f);
2153                        } else if (time_before(timeout, next_timer))
2154                                next_timer = timeout;
2155                }
2156                spin_unlock_bh(&vxlan->hash_lock);
2157        }
2158
2159        mod_timer(&vxlan->age_timer, next_timer);
2160}
2161
2162static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
2163{
2164        struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2165        __u32 vni = vxlan->default_dst.remote_vni;
2166
2167        vxlan->vn_sock = vs;
2168        spin_lock(&vn->sock_lock);
2169        hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
2170        spin_unlock(&vn->sock_lock);
2171}
2172
2173/* Setup stats when device is created */
2174static int vxlan_init(struct net_device *dev)
2175{
2176        dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2177        if (!dev->tstats)
2178                return -ENOMEM;
2179
2180        return 0;
2181}
2182
2183static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
2184{
2185        struct vxlan_fdb *f;
2186
2187        spin_lock_bh(&vxlan->hash_lock);
2188        f = __vxlan_find_mac(vxlan, all_zeros_mac);
2189        if (f)
2190                vxlan_fdb_destroy(vxlan, f);
2191        spin_unlock_bh(&vxlan->hash_lock);
2192}
2193
2194static void vxlan_uninit(struct net_device *dev)
2195{
2196        struct vxlan_dev *vxlan = netdev_priv(dev);
2197
2198        vxlan_fdb_delete_default(vxlan);
2199
2200        free_percpu(dev->tstats);
2201}
2202
2203/* Start ageing timer and join group when device is brought up */
2204static int vxlan_open(struct net_device *dev)
2205{
2206        struct vxlan_dev *vxlan = netdev_priv(dev);
2207        struct vxlan_sock *vs;
2208        int ret = 0;
2209
2210        vs = vxlan_sock_add(vxlan->net, vxlan->dst_port, vxlan_rcv, NULL,
2211                            false, vxlan->flags);
2212        if (IS_ERR(vs))
2213                return PTR_ERR(vs);
2214
2215        vxlan_vs_add_dev(vs, vxlan);
2216
2217        if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2218                ret = vxlan_igmp_join(vxlan);
2219                if (ret == -EADDRINUSE)
2220                        ret = 0;
2221                if (ret) {
2222                        vxlan_sock_release(vs);
2223                        return ret;
2224                }
2225        }
2226
2227        if (vxlan->age_interval)
2228                mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2229
2230        return ret;
2231}
2232
2233/* Purge the forwarding table */
2234static void vxlan_flush(struct vxlan_dev *vxlan)
2235{
2236        unsigned int h;
2237
2238        spin_lock_bh(&vxlan->hash_lock);
2239        for (h = 0; h < FDB_HASH_SIZE; ++h) {
2240                struct hlist_node *p, *n;
2241                hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2242                        struct vxlan_fdb *f
2243                                = container_of(p, struct vxlan_fdb, hlist);
2244                        /* the all_zeros_mac entry is deleted at vxlan_uninit */
2245                        if (!is_zero_ether_addr(f->eth_addr))
2246                                vxlan_fdb_destroy(vxlan, f);
2247                }
2248        }
2249        spin_unlock_bh(&vxlan->hash_lock);
2250}
2251
2252/* Cleanup timer and forwarding table on shutdown */
2253static int vxlan_stop(struct net_device *dev)
2254{
2255        struct vxlan_dev *vxlan = netdev_priv(dev);
2256        struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2257        struct vxlan_sock *vs = vxlan->vn_sock;
2258        int ret = 0;
2259
2260        if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2261            !vxlan_group_used(vn, vxlan))
2262                ret = vxlan_igmp_leave(vxlan);
2263
2264        del_timer_sync(&vxlan->age_timer);
2265
2266        vxlan_flush(vxlan);
2267        vxlan_sock_release(vs);
2268
2269        return ret;
2270}
2271
2272/* Stub, nothing needs to be done. */
2273static void vxlan_set_multicast_list(struct net_device *dev)
2274{
2275}
2276
2277static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2278{
2279        struct vxlan_dev *vxlan = netdev_priv(dev);
2280        struct vxlan_rdst *dst = &vxlan->default_dst;
2281        struct net_device *lowerdev;
2282        int max_mtu;
2283
2284        lowerdev = __dev_get_by_index(vxlan->net, dst->remote_ifindex);
2285        if (lowerdev == NULL)
2286                return eth_change_mtu(dev, new_mtu);
2287
2288        if (dst->remote_ip.sa.sa_family == AF_INET6)
2289                max_mtu = lowerdev->mtu - VXLAN6_HEADROOM;
2290        else
2291                max_mtu = lowerdev->mtu - VXLAN_HEADROOM;
2292
2293        if (new_mtu < 68 || new_mtu > max_mtu)
2294                return -EINVAL;
2295
2296        dev->mtu = new_mtu;
2297        return 0;
2298}
2299
2300static const struct net_device_ops vxlan_netdev_ops = {
2301        .ndo_init               = vxlan_init,
2302        .ndo_uninit             = vxlan_uninit,
2303        .ndo_open               = vxlan_open,
2304        .ndo_stop               = vxlan_stop,
2305        .ndo_start_xmit         = vxlan_xmit,
2306        .ndo_get_stats64        = ip_tunnel_get_stats64,
2307        .ndo_set_rx_mode        = vxlan_set_multicast_list,
2308        .ndo_change_mtu         = vxlan_change_mtu,
2309        .ndo_validate_addr      = eth_validate_addr,
2310        .ndo_set_mac_address    = eth_mac_addr,
2311        .ndo_fdb_add            = vxlan_fdb_add,
2312        .ndo_fdb_del            = vxlan_fdb_delete,
2313        .ndo_fdb_dump           = vxlan_fdb_dump,
2314};
2315
2316/* Info for udev, that this is a virtual tunnel endpoint */
2317static struct device_type vxlan_type = {
2318        .name = "vxlan",
2319};
2320
2321/* Calls the ndo_add_vxlan_port of the caller in order to
2322 * supply the listening VXLAN udp ports. Callers are expected
2323 * to implement the ndo_add_vxlan_port.
2324 */
2325void vxlan_get_rx_port(struct net_device *dev)
2326{
2327        struct vxlan_sock *vs;
2328        struct net *net = dev_net(dev);
2329        struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2330        sa_family_t sa_family;
2331        __be16 port;
2332        unsigned int i;
2333
2334        spin_lock(&vn->sock_lock);
2335        for (i = 0; i < PORT_HASH_SIZE; ++i) {
2336                hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2337                        port = inet_sk(vs->sock->sk)->inet_sport;
2338                        sa_family = vs->sock->sk->sk_family;
2339                        dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
2340                                                            port);
2341                }
2342        }
2343        spin_unlock(&vn->sock_lock);
2344}
2345EXPORT_SYMBOL_GPL(vxlan_get_rx_port);
2346
2347/* Initialize the device structure. */
2348static void vxlan_setup(struct net_device *dev)
2349{
2350        struct vxlan_dev *vxlan = netdev_priv(dev);
2351        unsigned int h;
2352
2353        eth_hw_addr_random(dev);
2354        ether_setup(dev);
2355        if (vxlan->default_dst.remote_ip.sa.sa_family == AF_INET6)
2356                dev->needed_headroom = ETH_HLEN + VXLAN6_HEADROOM;
2357        else
2358                dev->needed_headroom = ETH_HLEN + VXLAN_HEADROOM;
2359
2360        dev->netdev_ops = &vxlan_netdev_ops;
2361        dev->destructor = free_netdev;
2362        SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2363
2364        dev->tx_queue_len = 0;
2365        dev->features   |= NETIF_F_LLTX;
2366        dev->features   |= NETIF_F_SG | NETIF_F_HW_CSUM;
2367        dev->features   |= NETIF_F_RXCSUM;
2368        dev->features   |= NETIF_F_GSO_SOFTWARE;
2369
2370        dev->vlan_features = dev->features;
2371        dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2372        dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2373        dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2374        dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2375        netif_keep_dst(dev);
2376        dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2377
2378        INIT_LIST_HEAD(&vxlan->next);
2379        spin_lock_init(&vxlan->hash_lock);
2380
2381        init_timer_deferrable(&vxlan->age_timer);
2382        vxlan->age_timer.function = vxlan_cleanup;
2383        vxlan->age_timer.data = (unsigned long) vxlan;
2384
2385        vxlan->dst_port = htons(vxlan_port);
2386
2387        vxlan->dev = dev;
2388
2389        for (h = 0; h < FDB_HASH_SIZE; ++h)
2390                INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2391}
2392
2393static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2394        [IFLA_VXLAN_ID]         = { .type = NLA_U32 },
2395        [IFLA_VXLAN_GROUP]      = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2396        [IFLA_VXLAN_GROUP6]     = { .len = sizeof(struct in6_addr) },
2397        [IFLA_VXLAN_LINK]       = { .type = NLA_U32 },
2398        [IFLA_VXLAN_LOCAL]      = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2399        [IFLA_VXLAN_LOCAL6]     = { .len = sizeof(struct in6_addr) },
2400        [IFLA_VXLAN_TOS]        = { .type = NLA_U8 },
2401        [IFLA_VXLAN_TTL]        = { .type = NLA_U8 },
2402        [IFLA_VXLAN_LEARNING]   = { .type = NLA_U8 },
2403        [IFLA_VXLAN_AGEING]     = { .type = NLA_U32 },
2404        [IFLA_VXLAN_LIMIT]      = { .type = NLA_U32 },
2405        [IFLA_VXLAN_PORT_RANGE] = { .len  = sizeof(struct ifla_vxlan_port_range) },
2406        [IFLA_VXLAN_PROXY]      = { .type = NLA_U8 },
2407        [IFLA_VXLAN_RSC]        = { .type = NLA_U8 },
2408        [IFLA_VXLAN_L2MISS]     = { .type = NLA_U8 },
2409        [IFLA_VXLAN_L3MISS]     = { .type = NLA_U8 },
2410        [IFLA_VXLAN_PORT]       = { .type = NLA_U16 },
2411        [IFLA_VXLAN_UDP_CSUM]   = { .type = NLA_U8 },
2412        [IFLA_VXLAN_UDP_ZERO_CSUM6_TX]  = { .type = NLA_U8 },
2413        [IFLA_VXLAN_UDP_ZERO_CSUM6_RX]  = { .type = NLA_U8 },
2414        [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2415        [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
2416        [IFLA_VXLAN_GBP]        = { .type = NLA_FLAG, },
2417        [IFLA_VXLAN_REMCSUM_NOPARTIAL]  = { .type = NLA_FLAG },
2418};
2419
2420static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2421{
2422        if (tb[IFLA_ADDRESS]) {
2423                if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2424                        pr_debug("invalid link address (not ethernet)\n");
2425                        return -EINVAL;
2426                }
2427
2428                if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2429                        pr_debug("invalid all zero ethernet address\n");
2430                        return -EADDRNOTAVAIL;
2431                }
2432        }
2433
2434        if (!data)
2435                return -EINVAL;
2436
2437        if (data[IFLA_VXLAN_ID]) {
2438                __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2439                if (id >= VXLAN_VID_MASK)
2440                        return -ERANGE;
2441        }
2442
2443        if (data[IFLA_VXLAN_PORT_RANGE]) {
2444                const struct ifla_vxlan_port_range *p
2445                        = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2446
2447                if (ntohs(p->high) < ntohs(p->low)) {
2448                        pr_debug("port range %u .. %u not valid\n",
2449                                 ntohs(p->low), ntohs(p->high));
2450                        return -EINVAL;
2451                }
2452        }
2453
2454        return 0;
2455}
2456
2457static void vxlan_get_drvinfo(struct net_device *netdev,
2458                              struct ethtool_drvinfo *drvinfo)
2459{
2460        strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2461        strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2462}
2463
2464static const struct ethtool_ops vxlan_ethtool_ops = {
2465        .get_drvinfo    = vxlan_get_drvinfo,
2466        .get_link       = ethtool_op_get_link,
2467};
2468
2469static void vxlan_del_work(struct work_struct *work)
2470{
2471        struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
2472        udp_tunnel_sock_release(vs->sock);
2473        kfree_rcu(vs, rcu);
2474}
2475
2476static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2477                                        __be16 port, u32 flags)
2478{
2479        struct socket *sock;
2480        struct udp_port_cfg udp_conf;
2481        int err;
2482
2483        memset(&udp_conf, 0, sizeof(udp_conf));
2484
2485        if (ipv6) {
2486                udp_conf.family = AF_INET6;
2487                udp_conf.use_udp6_rx_checksums =
2488                    !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2489        } else {
2490                udp_conf.family = AF_INET;
2491        }
2492
2493        udp_conf.local_udp_port = port;
2494
2495        /* Open UDP socket */
2496        err = udp_sock_create(net, &udp_conf, &sock);
2497        if (err < 0)
2498                return ERR_PTR(err);
2499
2500        return sock;
2501}
2502
2503/* Create new listen socket if needed */
2504static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port,
2505                                              vxlan_rcv_t *rcv, void *data,
2506                                              u32 flags)
2507{
2508        struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2509        struct vxlan_sock *vs;
2510        struct socket *sock;
2511        unsigned int h;
2512        bool ipv6 = !!(flags & VXLAN_F_IPV6);
2513        struct udp_tunnel_sock_cfg tunnel_cfg;
2514
2515        vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2516        if (!vs)
2517                return ERR_PTR(-ENOMEM);
2518
2519        for (h = 0; h < VNI_HASH_SIZE; ++h)
2520                INIT_HLIST_HEAD(&vs->vni_list[h]);
2521
2522        INIT_WORK(&vs->del_work, vxlan_del_work);
2523
2524        sock = vxlan_create_sock(net, ipv6, port, flags);
2525        if (IS_ERR(sock)) {
2526                pr_info("Cannot bind port %d, err=%ld\n", ntohs(port),
2527                        PTR_ERR(sock));
2528                kfree(vs);
2529                return ERR_CAST(sock);
2530        }
2531
2532        vs->sock = sock;
2533        atomic_set(&vs->refcnt, 1);
2534        vs->rcv = rcv;
2535        vs->data = data;
2536        vs->flags = (flags & VXLAN_F_RCV_FLAGS);
2537
2538        /* Initialize the vxlan udp offloads structure */
2539        vs->udp_offloads.port = port;
2540        vs->udp_offloads.callbacks.gro_receive  = vxlan_gro_receive;
2541        vs->udp_offloads.callbacks.gro_complete = vxlan_gro_complete;
2542
2543        spin_lock(&vn->sock_lock);
2544        hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2545        vxlan_notify_add_rx_port(vs);
2546        spin_unlock(&vn->sock_lock);
2547
2548        /* Mark socket as an encapsulation socket. */
2549        tunnel_cfg.sk_user_data = vs;
2550        tunnel_cfg.encap_type = 1;
2551        tunnel_cfg.encap_rcv = vxlan_udp_encap_recv;
2552        tunnel_cfg.encap_destroy = NULL;
2553
2554        setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
2555
2556        return vs;
2557}
2558
2559struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port,
2560                                  vxlan_rcv_t *rcv, void *data,
2561                                  bool no_share, u32 flags)
2562{
2563        struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2564        struct vxlan_sock *vs;
2565        bool ipv6 = flags & VXLAN_F_IPV6;
2566
2567        if (!no_share) {
2568                spin_lock(&vn->sock_lock);
2569                vs = vxlan_find_sock(net, ipv6 ? AF_INET6 : AF_INET, port,
2570                                     flags);
2571                if (vs && vs->rcv == rcv) {
2572                        if (!atomic_add_unless(&vs->refcnt, 1, 0))
2573                                vs = ERR_PTR(-EBUSY);
2574                        spin_unlock(&vn->sock_lock);
2575                        return vs;
2576                }
2577                spin_unlock(&vn->sock_lock);
2578        }
2579
2580        return vxlan_socket_create(net, port, rcv, data, flags);
2581}
2582EXPORT_SYMBOL_GPL(vxlan_sock_add);
2583
2584static int vxlan_newlink(struct net *src_net, struct net_device *dev,
2585                         struct nlattr *tb[], struct nlattr *data[])
2586{
2587        struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
2588        struct vxlan_dev *vxlan = netdev_priv(dev);
2589        struct vxlan_rdst *dst = &vxlan->default_dst;
2590        __u32 vni;
2591        int err;
2592        bool use_ipv6 = false;
2593
2594        if (!data[IFLA_VXLAN_ID])
2595                return -EINVAL;
2596
2597        vxlan->net = src_net;
2598
2599        vni = nla_get_u32(data[IFLA_VXLAN_ID]);
2600        dst->remote_vni = vni;
2601
2602        /* Unless IPv6 is explicitly requested, assume IPv4 */
2603        dst->remote_ip.sa.sa_family = AF_INET;
2604        if (data[IFLA_VXLAN_GROUP]) {
2605                dst->remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
2606        } else if (data[IFLA_VXLAN_GROUP6]) {
2607                if (!IS_ENABLED(CONFIG_IPV6))
2608                        return -EPFNOSUPPORT;
2609
2610                dst->remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
2611                dst->remote_ip.sa.sa_family = AF_INET6;
2612                use_ipv6 = true;
2613        }
2614
2615        if (data[IFLA_VXLAN_LOCAL]) {
2616                vxlan->saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
2617                vxlan->saddr.sa.sa_family = AF_INET;
2618        } else if (data[IFLA_VXLAN_LOCAL6]) {
2619                if (!IS_ENABLED(CONFIG_IPV6))
2620                        return -EPFNOSUPPORT;
2621
2622                /* TODO: respect scope id */
2623                vxlan->saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
2624                vxlan->saddr.sa.sa_family = AF_INET6;
2625                use_ipv6 = true;
2626        }
2627
2628        if (data[IFLA_VXLAN_LINK] &&
2629            (dst->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]))) {
2630                struct net_device *lowerdev
2631                         = __dev_get_by_index(src_net, dst->remote_ifindex);
2632
2633                if (!lowerdev) {
2634                        pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
2635                        return -ENODEV;
2636                }
2637
2638#if IS_ENABLED(CONFIG_IPV6)
2639                if (use_ipv6) {
2640                        struct inet6_dev *idev = __in6_dev_get(lowerdev);
2641                        if (idev && idev->cnf.disable_ipv6) {
2642                                pr_info("IPv6 is disabled via sysctl\n");
2643                                return -EPERM;
2644                        }
2645                        vxlan->flags |= VXLAN_F_IPV6;
2646                }
2647#endif
2648
2649                if (!tb[IFLA_MTU])
2650                        dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2651
2652                dev->needed_headroom = lowerdev->hard_header_len +
2653                                       (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2654        } else if (use_ipv6)
2655                vxlan->flags |= VXLAN_F_IPV6;
2656
2657        if (data[IFLA_VXLAN_TOS])
2658                vxlan->tos  = nla_get_u8(data[IFLA_VXLAN_TOS]);
2659
2660        if (data[IFLA_VXLAN_TTL])
2661                vxlan->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
2662
2663        if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
2664                vxlan->flags |= VXLAN_F_LEARN;
2665
2666        if (data[IFLA_VXLAN_AGEING])
2667                vxlan->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
2668        else
2669                vxlan->age_interval = FDB_AGE_DEFAULT;
2670
2671        if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
2672                vxlan->flags |= VXLAN_F_PROXY;
2673
2674        if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
2675                vxlan->flags |= VXLAN_F_RSC;
2676
2677        if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
2678                vxlan->flags |= VXLAN_F_L2MISS;
2679
2680        if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
2681                vxlan->flags |= VXLAN_F_L3MISS;
2682
2683        if (data[IFLA_VXLAN_LIMIT])
2684                vxlan->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
2685
2686        if (data[IFLA_VXLAN_PORT_RANGE]) {
2687                const struct ifla_vxlan_port_range *p
2688                        = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2689                vxlan->port_min = ntohs(p->low);
2690                vxlan->port_max = ntohs(p->high);
2691        }
2692
2693        if (data[IFLA_VXLAN_PORT])
2694                vxlan->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
2695
2696        if (data[IFLA_VXLAN_UDP_CSUM] && nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
2697                vxlan->flags |= VXLAN_F_UDP_CSUM;
2698
2699        if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
2700            nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
2701                vxlan->flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
2702
2703        if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
2704            nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
2705                vxlan->flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
2706
2707        if (data[IFLA_VXLAN_REMCSUM_TX] &&
2708            nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
2709                vxlan->flags |= VXLAN_F_REMCSUM_TX;
2710
2711        if (data[IFLA_VXLAN_REMCSUM_RX] &&
2712            nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
2713                vxlan->flags |= VXLAN_F_REMCSUM_RX;
2714
2715        if (data[IFLA_VXLAN_GBP])
2716                vxlan->flags |= VXLAN_F_GBP;
2717
2718        if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL])
2719                vxlan->flags |= VXLAN_F_REMCSUM_NOPARTIAL;
2720
2721        if (vxlan_find_vni(src_net, vni, use_ipv6 ? AF_INET6 : AF_INET,
2722                           vxlan->dst_port, vxlan->flags)) {
2723                pr_info("duplicate VNI %u\n", vni);
2724                return -EEXIST;
2725        }
2726
2727        dev->ethtool_ops = &vxlan_ethtool_ops;
2728
2729        /* create an fdb entry for a valid default destination */
2730        if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2731                err = vxlan_fdb_create(vxlan, all_zeros_mac,
2732                                       &vxlan->default_dst.remote_ip,
2733                                       NUD_REACHABLE|NUD_PERMANENT,
2734                                       NLM_F_EXCL|NLM_F_CREATE,
2735                                       vxlan->dst_port,
2736                                       vxlan->default_dst.remote_vni,
2737                                       vxlan->default_dst.remote_ifindex,
2738                                       NTF_SELF);
2739                if (err)
2740                        return err;
2741        }
2742
2743        err = register_netdevice(dev);
2744        if (err) {
2745                vxlan_fdb_delete_default(vxlan);
2746                return err;
2747        }
2748
2749        list_add(&vxlan->next, &vn->vxlan_list);
2750
2751        return 0;
2752}
2753
2754static void vxlan_dellink(struct net_device *dev, struct list_head *head)
2755{
2756        struct vxlan_dev *vxlan = netdev_priv(dev);
2757        struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2758
2759        spin_lock(&vn->sock_lock);
2760        if (!hlist_unhashed(&vxlan->hlist))
2761                hlist_del_rcu(&vxlan->hlist);
2762        spin_unlock(&vn->sock_lock);
2763
2764        list_del(&vxlan->next);
2765        unregister_netdevice_queue(dev, head);
2766}
2767
2768static size_t vxlan_get_size(const struct net_device *dev)
2769{
2770
2771        return nla_total_size(sizeof(__u32)) +  /* IFLA_VXLAN_ID */
2772                nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
2773                nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
2774                nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
2775                nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TTL */
2776                nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TOS */
2777                nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_LEARNING */
2778                nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_PROXY */
2779                nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_RSC */
2780                nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L2MISS */
2781                nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L3MISS */
2782                nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
2783                nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
2784                nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
2785                nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
2786                nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
2787                nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
2788                nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
2789                nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
2790                nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
2791                0;
2792}
2793
2794static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
2795{
2796        const struct vxlan_dev *vxlan = netdev_priv(dev);
2797        const struct vxlan_rdst *dst = &vxlan->default_dst;
2798        struct ifla_vxlan_port_range ports = {
2799                .low =  htons(vxlan->port_min),
2800                .high = htons(vxlan->port_max),
2801        };
2802
2803        if (nla_put_u32(skb, IFLA_VXLAN_ID, dst->remote_vni))
2804                goto nla_put_failure;
2805
2806        if (!vxlan_addr_any(&dst->remote_ip)) {
2807                if (dst->remote_ip.sa.sa_family == AF_INET) {
2808                        if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
2809                                            dst->remote_ip.sin.sin_addr.s_addr))
2810                                goto nla_put_failure;
2811#if IS_ENABLED(CONFIG_IPV6)
2812                } else {
2813                        if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
2814                                             &dst->remote_ip.sin6.sin6_addr))
2815                                goto nla_put_failure;
2816#endif
2817                }
2818        }
2819
2820        if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
2821                goto nla_put_failure;
2822
2823        if (!vxlan_addr_any(&vxlan->saddr)) {
2824                if (vxlan->saddr.sa.sa_family == AF_INET) {
2825                        if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
2826                                            vxlan->saddr.sin.sin_addr.s_addr))
2827                                goto nla_put_failure;
2828#if IS_ENABLED(CONFIG_IPV6)
2829                } else {
2830                        if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
2831                                             &vxlan->saddr.sin6.sin6_addr))
2832                                goto nla_put_failure;
2833#endif
2834                }
2835        }
2836
2837        if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->ttl) ||
2838            nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->tos) ||
2839            nla_put_u8(skb, IFLA_VXLAN_LEARNING,
2840                        !!(vxlan->flags & VXLAN_F_LEARN)) ||
2841            nla_put_u8(skb, IFLA_VXLAN_PROXY,
2842                        !!(vxlan->flags & VXLAN_F_PROXY)) ||
2843            nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
2844            nla_put_u8(skb, IFLA_VXLAN_L2MISS,
2845                        !!(vxlan->flags & VXLAN_F_L2MISS)) ||
2846            nla_put_u8(skb, IFLA_VXLAN_L3MISS,
2847                        !!(vxlan->flags & VXLAN_F_L3MISS)) ||
2848            nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->age_interval) ||
2849            nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->addrmax) ||
2850            nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->dst_port) ||
2851            nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
2852                        !!(vxlan->flags & VXLAN_F_UDP_CSUM)) ||
2853            nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
2854                        !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
2855            nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
2856                        !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
2857            nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
2858                        !!(vxlan->flags & VXLAN_F_REMCSUM_TX)) ||
2859            nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
2860                        !!(vxlan->flags & VXLAN_F_REMCSUM_RX)))
2861                goto nla_put_failure;
2862
2863        if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
2864                goto nla_put_failure;
2865
2866        if (vxlan->flags & VXLAN_F_GBP &&
2867            nla_put_flag(skb, IFLA_VXLAN_GBP))
2868                goto nla_put_failure;
2869
2870        if (vxlan->flags & VXLAN_F_REMCSUM_NOPARTIAL &&
2871            nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
2872                goto nla_put_failure;
2873
2874        return 0;
2875
2876nla_put_failure:
2877        return -EMSGSIZE;
2878}
2879
2880static struct net *vxlan_get_link_net(const struct net_device *dev)
2881{
2882        struct vxlan_dev *vxlan = netdev_priv(dev);
2883
2884        return vxlan->net;
2885}
2886
2887static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
2888        .kind           = "vxlan",
2889        .maxtype        = IFLA_VXLAN_MAX,
2890        .policy         = vxlan_policy,
2891        .priv_size      = sizeof(struct vxlan_dev),
2892        .setup          = vxlan_setup,
2893        .validate       = vxlan_validate,
2894        .newlink        = vxlan_newlink,
2895        .dellink        = vxlan_dellink,
2896        .get_size       = vxlan_get_size,
2897        .fill_info      = vxlan_fill_info,
2898        .get_link_net   = vxlan_get_link_net,
2899};
2900
2901static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
2902                                             struct net_device *dev)
2903{
2904        struct vxlan_dev *vxlan, *next;
2905        LIST_HEAD(list_kill);
2906
2907        list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
2908                struct vxlan_rdst *dst = &vxlan->default_dst;
2909
2910                /* In case we created vxlan device with carrier
2911                 * and we loose the carrier due to module unload
2912                 * we also need to remove vxlan device. In other
2913                 * cases, it's not necessary and remote_ifindex
2914                 * is 0 here, so no matches.
2915                 */
2916                if (dst->remote_ifindex == dev->ifindex)
2917                        vxlan_dellink(vxlan->dev, &list_kill);
2918        }
2919
2920        unregister_netdevice_many(&list_kill);
2921}
2922
2923static int vxlan_lowerdev_event(struct notifier_block *unused,
2924                                unsigned long event, void *ptr)
2925{
2926        struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2927        struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
2928
2929        if (event == NETDEV_UNREGISTER)
2930                vxlan_handle_lowerdev_unregister(vn, dev);
2931
2932        return NOTIFY_DONE;
2933}
2934
2935static struct notifier_block vxlan_notifier_block __read_mostly = {
2936        .notifier_call = vxlan_lowerdev_event,
2937};
2938
2939static __net_init int vxlan_init_net(struct net *net)
2940{
2941        struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2942        unsigned int h;
2943
2944        INIT_LIST_HEAD(&vn->vxlan_list);
2945        spin_lock_init(&vn->sock_lock);
2946
2947        for (h = 0; h < PORT_HASH_SIZE; ++h)
2948                INIT_HLIST_HEAD(&vn->sock_list[h]);
2949
2950        return 0;
2951}
2952
2953static void __net_exit vxlan_exit_net(struct net *net)
2954{
2955        struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2956        struct vxlan_dev *vxlan, *next;
2957        struct net_device *dev, *aux;
2958        LIST_HEAD(list);
2959
2960        rtnl_lock();
2961        for_each_netdev_safe(net, dev, aux)
2962                if (dev->rtnl_link_ops == &vxlan_link_ops)
2963                        unregister_netdevice_queue(dev, &list);
2964
2965        list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
2966                /* If vxlan->dev is in the same netns, it has already been added
2967                 * to the list by the previous loop.
2968                 */
2969                if (!net_eq(dev_net(vxlan->dev), net))
2970                        unregister_netdevice_queue(vxlan->dev, &list);
2971        }
2972
2973        unregister_netdevice_many(&list);
2974        rtnl_unlock();
2975}
2976
2977static struct pernet_operations vxlan_net_ops = {
2978        .init = vxlan_init_net,
2979        .exit = vxlan_exit_net,
2980        .id   = &vxlan_net_id,
2981        .size = sizeof(struct vxlan_net),
2982};
2983
2984static int __init vxlan_init_module(void)
2985{
2986        int rc;
2987
2988        vxlan_wq = alloc_workqueue("vxlan", 0, 0);
2989        if (!vxlan_wq)
2990                return -ENOMEM;
2991
2992        get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
2993
2994        rc = register_pernet_subsys(&vxlan_net_ops);
2995        if (rc)
2996                goto out1;
2997
2998        rc = register_netdevice_notifier(&vxlan_notifier_block);
2999        if (rc)
3000                goto out2;
3001
3002        rc = rtnl_link_register(&vxlan_link_ops);
3003        if (rc)
3004                goto out3;
3005
3006        return 0;
3007out3:
3008        unregister_netdevice_notifier(&vxlan_notifier_block);
3009out2:
3010        unregister_pernet_subsys(&vxlan_net_ops);
3011out1:
3012        destroy_workqueue(vxlan_wq);
3013        return rc;
3014}
3015late_initcall(vxlan_init_module);
3016
3017static void __exit vxlan_cleanup_module(void)
3018{
3019        rtnl_link_unregister(&vxlan_link_ops);
3020        unregister_netdevice_notifier(&vxlan_notifier_block);
3021        destroy_workqueue(vxlan_wq);
3022        unregister_pernet_subsys(&vxlan_net_ops);
3023        /* rcu_barrier() is called by netns */
3024}
3025module_exit(vxlan_cleanup_module);
3026
3027MODULE_LICENSE("GPL");
3028MODULE_VERSION(VXLAN_VERSION);
3029MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
3030MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
3031MODULE_ALIAS_RTNL_LINK("vxlan");
3032