linux/drivers/net/vxlan.c
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   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 * TODO
  11 *  - IPv6 (not in RFC)
  12 */
  13
  14#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  15
  16#include <linux/kernel.h>
  17#include <linux/types.h>
  18#include <linux/module.h>
  19#include <linux/errno.h>
  20#include <linux/slab.h>
  21#include <linux/skbuff.h>
  22#include <linux/rculist.h>
  23#include <linux/netdevice.h>
  24#include <linux/in.h>
  25#include <linux/ip.h>
  26#include <linux/udp.h>
  27#include <linux/igmp.h>
  28#include <linux/etherdevice.h>
  29#include <linux/if_ether.h>
  30#include <linux/hash.h>
  31#include <linux/ethtool.h>
  32#include <net/arp.h>
  33#include <net/ndisc.h>
  34#include <net/ip.h>
  35#include <net/ip_tunnels.h>
  36#include <net/icmp.h>
  37#include <net/udp.h>
  38#include <net/rtnetlink.h>
  39#include <net/route.h>
  40#include <net/dsfield.h>
  41#include <net/inet_ecn.h>
  42#include <net/net_namespace.h>
  43#include <net/netns/generic.h>
  44
  45#define VXLAN_VERSION   "0.1"
  46
  47#define PORT_HASH_BITS  8
  48#define PORT_HASH_SIZE  (1<<PORT_HASH_BITS)
  49#define VNI_HASH_BITS   10
  50#define VNI_HASH_SIZE   (1<<VNI_HASH_BITS)
  51#define FDB_HASH_BITS   8
  52#define FDB_HASH_SIZE   (1<<FDB_HASH_BITS)
  53#define FDB_AGE_DEFAULT 300 /* 5 min */
  54#define FDB_AGE_INTERVAL (10 * HZ)      /* rescan interval */
  55
  56#define VXLAN_N_VID     (1u << 24)
  57#define VXLAN_VID_MASK  (VXLAN_N_VID - 1)
  58/* IP header + UDP + VXLAN + Ethernet header */
  59#define VXLAN_HEADROOM (20 + 8 + 8 + 14)
  60
  61#define VXLAN_FLAGS 0x08000000  /* struct vxlanhdr.vx_flags required value. */
  62
  63/* VXLAN protocol header */
  64struct vxlanhdr {
  65        __be32 vx_flags;
  66        __be32 vx_vni;
  67};
  68
  69/* UDP port for VXLAN traffic.
  70 * The IANA assigned port is 4789, but the Linux default is 8472
  71 * for compatibility with early adopters.
  72 */
  73static unsigned short vxlan_port __read_mostly = 8472;
  74module_param_named(udp_port, vxlan_port, ushort, 0444);
  75MODULE_PARM_DESC(udp_port, "Destination UDP port");
  76
  77static bool log_ecn_error = true;
  78module_param(log_ecn_error, bool, 0644);
  79MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
  80
  81static int vxlan_net_id;
  82
  83static const u8 all_zeros_mac[ETH_ALEN];
  84
  85/* per UDP socket information */
  86struct vxlan_sock {
  87        struct hlist_node hlist;
  88        struct rcu_head   rcu;
  89        struct work_struct del_work;
  90        atomic_t          refcnt;
  91        struct socket     *sock;
  92        struct hlist_head vni_list[VNI_HASH_SIZE];
  93};
  94
  95/* per-network namespace private data for this module */
  96struct vxlan_net {
  97        struct list_head  vxlan_list;
  98        struct hlist_head sock_list[PORT_HASH_SIZE];
  99        spinlock_t        sock_lock;
 100};
 101
 102struct vxlan_rdst {
 103        __be32                   remote_ip;
 104        __be16                   remote_port;
 105        u32                      remote_vni;
 106        u32                      remote_ifindex;
 107        struct list_head         list;
 108        struct rcu_head          rcu;
 109};
 110
 111/* Forwarding table entry */
 112struct vxlan_fdb {
 113        struct hlist_node hlist;        /* linked list of entries */
 114        struct rcu_head   rcu;
 115        unsigned long     updated;      /* jiffies */
 116        unsigned long     used;
 117        struct list_head  remotes;
 118        u16               state;        /* see ndm_state */
 119        u8                flags;        /* see ndm_flags */
 120        u8                eth_addr[ETH_ALEN];
 121};
 122
 123/* Pseudo network device */
 124struct vxlan_dev {
 125        struct hlist_node hlist;        /* vni hash table */
 126        struct list_head  next;         /* vxlan's per namespace list */
 127        struct vxlan_sock *vn_sock;     /* listening socket */
 128        struct net_device *dev;
 129        struct vxlan_rdst default_dst;  /* default destination */
 130        __be32            saddr;        /* source address */
 131        __be16            dst_port;
 132        __u16             port_min;     /* source port range */
 133        __u16             port_max;
 134        __u8              tos;          /* TOS override */
 135        __u8              ttl;
 136        u32               flags;        /* VXLAN_F_* below */
 137
 138        struct work_struct sock_work;
 139        struct work_struct igmp_join;
 140        struct work_struct igmp_leave;
 141
 142        unsigned long     age_interval;
 143        struct timer_list age_timer;
 144        spinlock_t        hash_lock;
 145        unsigned int      addrcnt;
 146        unsigned int      addrmax;
 147
 148        struct hlist_head fdb_head[FDB_HASH_SIZE];
 149};
 150
 151#define VXLAN_F_LEARN   0x01
 152#define VXLAN_F_PROXY   0x02
 153#define VXLAN_F_RSC     0x04
 154#define VXLAN_F_L2MISS  0x08
 155#define VXLAN_F_L3MISS  0x10
 156
 157/* salt for hash table */
 158static u32 vxlan_salt __read_mostly;
 159static struct workqueue_struct *vxlan_wq;
 160
 161static void vxlan_sock_work(struct work_struct *work);
 162
 163/* Virtual Network hash table head */
 164static inline struct hlist_head *vni_head(struct vxlan_sock *vs, u32 id)
 165{
 166        return &vs->vni_list[hash_32(id, VNI_HASH_BITS)];
 167}
 168
 169/* Socket hash table head */
 170static inline struct hlist_head *vs_head(struct net *net, __be16 port)
 171{
 172        struct vxlan_net *vn = net_generic(net, vxlan_net_id);
 173
 174        return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
 175}
 176
 177/* First remote destination for a forwarding entry.
 178 * Guaranteed to be non-NULL because remotes are never deleted.
 179 */
 180static inline struct vxlan_rdst *first_remote(struct vxlan_fdb *fdb)
 181{
 182        return list_first_or_null_rcu(&fdb->remotes, struct vxlan_rdst, list);
 183}
 184
 185/* Find VXLAN socket based on network namespace and UDP port */
 186static struct vxlan_sock *vxlan_find_port(struct net *net, __be16 port)
 187{
 188        struct vxlan_sock *vs;
 189
 190        hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
 191                if (inet_sk(vs->sock->sk)->inet_sport == port)
 192                        return vs;
 193        }
 194        return NULL;
 195}
 196
 197/* Look up VNI in a per net namespace table */
 198static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id, __be16 port)
 199{
 200        struct vxlan_sock *vs;
 201        struct vxlan_dev *vxlan;
 202
 203        vs = vxlan_find_port(net, port);
 204        if (!vs)
 205                return NULL;
 206
 207        hlist_for_each_entry_rcu(vxlan, vni_head(vs, id), hlist) {
 208                if (vxlan->default_dst.remote_vni == id)
 209                        return vxlan;
 210        }
 211
 212        return NULL;
 213}
 214
 215/* Fill in neighbour message in skbuff. */
 216static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
 217                          const struct vxlan_fdb *fdb,
 218                          u32 portid, u32 seq, int type, unsigned int flags,
 219                          const struct vxlan_rdst *rdst)
 220{
 221        unsigned long now = jiffies;
 222        struct nda_cacheinfo ci;
 223        struct nlmsghdr *nlh;
 224        struct ndmsg *ndm;
 225        bool send_ip, send_eth;
 226
 227        nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
 228        if (nlh == NULL)
 229                return -EMSGSIZE;
 230
 231        ndm = nlmsg_data(nlh);
 232        memset(ndm, 0, sizeof(*ndm));
 233
 234        send_eth = send_ip = true;
 235
 236        if (type == RTM_GETNEIGH) {
 237                ndm->ndm_family = AF_INET;
 238                send_ip = rdst->remote_ip != htonl(INADDR_ANY);
 239                send_eth = !is_zero_ether_addr(fdb->eth_addr);
 240        } else
 241                ndm->ndm_family = AF_BRIDGE;
 242        ndm->ndm_state = fdb->state;
 243        ndm->ndm_ifindex = vxlan->dev->ifindex;
 244        ndm->ndm_flags = fdb->flags;
 245        ndm->ndm_type = NDA_DST;
 246
 247        if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
 248                goto nla_put_failure;
 249
 250        if (send_ip && nla_put_be32(skb, NDA_DST, rdst->remote_ip))
 251                goto nla_put_failure;
 252
 253        if (rdst->remote_port && rdst->remote_port != vxlan->dst_port &&
 254            nla_put_be16(skb, NDA_PORT, rdst->remote_port))
 255                goto nla_put_failure;
 256        if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
 257            nla_put_u32(skb, NDA_VNI, rdst->remote_vni))
 258                goto nla_put_failure;
 259        if (rdst->remote_ifindex &&
 260            nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
 261                goto nla_put_failure;
 262
 263        ci.ndm_used      = jiffies_to_clock_t(now - fdb->used);
 264        ci.ndm_confirmed = 0;
 265        ci.ndm_updated   = jiffies_to_clock_t(now - fdb->updated);
 266        ci.ndm_refcnt    = 0;
 267
 268        if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
 269                goto nla_put_failure;
 270
 271        return nlmsg_end(skb, nlh);
 272
 273nla_put_failure:
 274        nlmsg_cancel(skb, nlh);
 275        return -EMSGSIZE;
 276}
 277
 278static inline size_t vxlan_nlmsg_size(void)
 279{
 280        return NLMSG_ALIGN(sizeof(struct ndmsg))
 281                + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
 282                + nla_total_size(sizeof(__be32)) /* NDA_DST */
 283                + nla_total_size(sizeof(__be16)) /* NDA_PORT */
 284                + nla_total_size(sizeof(__be32)) /* NDA_VNI */
 285                + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
 286                + nla_total_size(sizeof(struct nda_cacheinfo));
 287}
 288
 289static void vxlan_fdb_notify(struct vxlan_dev *vxlan,
 290                             struct vxlan_fdb *fdb, int type)
 291{
 292        struct net *net = dev_net(vxlan->dev);
 293        struct sk_buff *skb;
 294        int err = -ENOBUFS;
 295
 296        skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
 297        if (skb == NULL)
 298                goto errout;
 299
 300        err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, first_remote(fdb));
 301        if (err < 0) {
 302                /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
 303                WARN_ON(err == -EMSGSIZE);
 304                kfree_skb(skb);
 305                goto errout;
 306        }
 307
 308        rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
 309        return;
 310errout:
 311        if (err < 0)
 312                rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
 313}
 314
 315static void vxlan_ip_miss(struct net_device *dev, __be32 ipa)
 316{
 317        struct vxlan_dev *vxlan = netdev_priv(dev);
 318        struct vxlan_fdb f = {
 319                .state = NUD_STALE,
 320        };
 321        struct vxlan_rdst remote = {
 322                .remote_ip = ipa, /* goes to NDA_DST */
 323                .remote_vni = VXLAN_N_VID,
 324        };
 325
 326        INIT_LIST_HEAD(&f.remotes);
 327        list_add_rcu(&remote.list, &f.remotes);
 328
 329        vxlan_fdb_notify(vxlan, &f, RTM_GETNEIGH);
 330}
 331
 332static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
 333{
 334        struct vxlan_fdb f = {
 335                .state = NUD_STALE,
 336        };
 337
 338        INIT_LIST_HEAD(&f.remotes);
 339        memcpy(f.eth_addr, eth_addr, ETH_ALEN);
 340
 341        vxlan_fdb_notify(vxlan, &f, RTM_GETNEIGH);
 342}
 343
 344/* Hash Ethernet address */
 345static u32 eth_hash(const unsigned char *addr)
 346{
 347        u64 value = get_unaligned((u64 *)addr);
 348
 349        /* only want 6 bytes */
 350#ifdef __BIG_ENDIAN
 351        value >>= 16;
 352#else
 353        value <<= 16;
 354#endif
 355        return hash_64(value, FDB_HASH_BITS);
 356}
 357
 358/* Hash chain to use given mac address */
 359static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
 360                                                const u8 *mac)
 361{
 362        return &vxlan->fdb_head[eth_hash(mac)];
 363}
 364
 365/* Look up Ethernet address in forwarding table */
 366static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
 367                                        const u8 *mac)
 368
 369{
 370        struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
 371        struct vxlan_fdb *f;
 372
 373        hlist_for_each_entry_rcu(f, head, hlist) {
 374                if (compare_ether_addr(mac, f->eth_addr) == 0)
 375                        return f;
 376        }
 377
 378        return NULL;
 379}
 380
 381static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
 382                                        const u8 *mac)
 383{
 384        struct vxlan_fdb *f;
 385
 386        f = __vxlan_find_mac(vxlan, mac);
 387        if (f)
 388                f->used = jiffies;
 389
 390        return f;
 391}
 392
 393/* caller should hold vxlan->hash_lock */
 394static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
 395                                              __be32 ip, __be16 port,
 396                                              __u32 vni, __u32 ifindex)
 397{
 398        struct vxlan_rdst *rd;
 399
 400        list_for_each_entry(rd, &f->remotes, list) {
 401                if (rd->remote_ip == ip &&
 402                    rd->remote_port == port &&
 403                    rd->remote_vni == vni &&
 404                    rd->remote_ifindex == ifindex)
 405                        return rd;
 406        }
 407
 408        return NULL;
 409}
 410
 411/* Add/update destinations for multicast */
 412static int vxlan_fdb_append(struct vxlan_fdb *f,
 413                            __be32 ip, __be16 port, __u32 vni, __u32 ifindex)
 414{
 415        struct vxlan_rdst *rd;
 416
 417        rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
 418        if (rd)
 419                return 0;
 420
 421        rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
 422        if (rd == NULL)
 423                return -ENOBUFS;
 424        rd->remote_ip = ip;
 425        rd->remote_port = port;
 426        rd->remote_vni = vni;
 427        rd->remote_ifindex = ifindex;
 428
 429        list_add_tail_rcu(&rd->list, &f->remotes);
 430
 431        return 1;
 432}
 433
 434/* Add new entry to forwarding table -- assumes lock held */
 435static int vxlan_fdb_create(struct vxlan_dev *vxlan,
 436                            const u8 *mac, __be32 ip,
 437                            __u16 state, __u16 flags,
 438                            __be16 port, __u32 vni, __u32 ifindex,
 439                            __u8 ndm_flags)
 440{
 441        struct vxlan_fdb *f;
 442        int notify = 0;
 443
 444        f = __vxlan_find_mac(vxlan, mac);
 445        if (f) {
 446                if (flags & NLM_F_EXCL) {
 447                        netdev_dbg(vxlan->dev,
 448                                   "lost race to create %pM\n", mac);
 449                        return -EEXIST;
 450                }
 451                if (f->state != state) {
 452                        f->state = state;
 453                        f->updated = jiffies;
 454                        notify = 1;
 455                }
 456                if (f->flags != ndm_flags) {
 457                        f->flags = ndm_flags;
 458                        f->updated = jiffies;
 459                        notify = 1;
 460                }
 461                if ((flags & NLM_F_APPEND) &&
 462                    (is_multicast_ether_addr(f->eth_addr) ||
 463                     is_zero_ether_addr(f->eth_addr))) {
 464                        int rc = vxlan_fdb_append(f, ip, port, vni, ifindex);
 465
 466                        if (rc < 0)
 467                                return rc;
 468                        notify |= rc;
 469                }
 470        } else {
 471                if (!(flags & NLM_F_CREATE))
 472                        return -ENOENT;
 473
 474                if (vxlan->addrmax && vxlan->addrcnt >= vxlan->addrmax)
 475                        return -ENOSPC;
 476
 477                netdev_dbg(vxlan->dev, "add %pM -> %pI4\n", mac, &ip);
 478                f = kmalloc(sizeof(*f), GFP_ATOMIC);
 479                if (!f)
 480                        return -ENOMEM;
 481
 482                notify = 1;
 483                f->state = state;
 484                f->flags = ndm_flags;
 485                f->updated = f->used = jiffies;
 486                INIT_LIST_HEAD(&f->remotes);
 487                memcpy(f->eth_addr, mac, ETH_ALEN);
 488
 489                vxlan_fdb_append(f, ip, port, vni, ifindex);
 490
 491                ++vxlan->addrcnt;
 492                hlist_add_head_rcu(&f->hlist,
 493                                   vxlan_fdb_head(vxlan, mac));
 494        }
 495
 496        if (notify)
 497                vxlan_fdb_notify(vxlan, f, RTM_NEWNEIGH);
 498
 499        return 0;
 500}
 501
 502static void vxlan_fdb_free_rdst(struct rcu_head *head)
 503{
 504        struct vxlan_rdst *rd = container_of(head, struct vxlan_rdst, rcu);
 505        kfree(rd);
 506}
 507
 508static void vxlan_fdb_free(struct rcu_head *head)
 509{
 510        struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
 511        struct vxlan_rdst *rd, *nd;
 512
 513        list_for_each_entry_safe(rd, nd, &f->remotes, list)
 514                kfree(rd);
 515        kfree(f);
 516}
 517
 518static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
 519{
 520        netdev_dbg(vxlan->dev,
 521                    "delete %pM\n", f->eth_addr);
 522
 523        --vxlan->addrcnt;
 524        vxlan_fdb_notify(vxlan, f, RTM_DELNEIGH);
 525
 526        hlist_del_rcu(&f->hlist);
 527        call_rcu(&f->rcu, vxlan_fdb_free);
 528}
 529
 530static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
 531                           __be32 *ip, __be16 *port, u32 *vni, u32 *ifindex)
 532{
 533        struct net *net = dev_net(vxlan->dev);
 534
 535        if (tb[NDA_DST]) {
 536                if (nla_len(tb[NDA_DST]) != sizeof(__be32))
 537                        return -EAFNOSUPPORT;
 538
 539                *ip = nla_get_be32(tb[NDA_DST]);
 540        } else {
 541                *ip = htonl(INADDR_ANY);
 542        }
 543
 544        if (tb[NDA_PORT]) {
 545                if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
 546                        return -EINVAL;
 547                *port = nla_get_be16(tb[NDA_PORT]);
 548        } else {
 549                *port = vxlan->dst_port;
 550        }
 551
 552        if (tb[NDA_VNI]) {
 553                if (nla_len(tb[NDA_VNI]) != sizeof(u32))
 554                        return -EINVAL;
 555                *vni = nla_get_u32(tb[NDA_VNI]);
 556        } else {
 557                *vni = vxlan->default_dst.remote_vni;
 558        }
 559
 560        if (tb[NDA_IFINDEX]) {
 561                struct net_device *tdev;
 562
 563                if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
 564                        return -EINVAL;
 565                *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
 566                tdev = dev_get_by_index(net, *ifindex);
 567                if (!tdev)
 568                        return -EADDRNOTAVAIL;
 569                dev_put(tdev);
 570        } else {
 571                *ifindex = 0;
 572        }
 573
 574        return 0;
 575}
 576
 577/* Add static entry (via netlink) */
 578static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 579                         struct net_device *dev,
 580                         const unsigned char *addr, u16 flags)
 581{
 582        struct vxlan_dev *vxlan = netdev_priv(dev);
 583        /* struct net *net = dev_net(vxlan->dev); */
 584        __be32 ip;
 585        __be16 port;
 586        u32 vni, ifindex;
 587        int err;
 588
 589        if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
 590                pr_info("RTM_NEWNEIGH with invalid state %#x\n",
 591                        ndm->ndm_state);
 592                return -EINVAL;
 593        }
 594
 595        if (tb[NDA_DST] == NULL)
 596                return -EINVAL;
 597
 598        err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
 599        if (err)
 600                return err;
 601
 602        spin_lock_bh(&vxlan->hash_lock);
 603        err = vxlan_fdb_create(vxlan, addr, ip, ndm->ndm_state, flags,
 604                               port, vni, ifindex, ndm->ndm_flags);
 605        spin_unlock_bh(&vxlan->hash_lock);
 606
 607        return err;
 608}
 609
 610/* Delete entry (via netlink) */
 611static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 612                            struct net_device *dev,
 613                            const unsigned char *addr)
 614{
 615        struct vxlan_dev *vxlan = netdev_priv(dev);
 616        struct vxlan_fdb *f;
 617        struct vxlan_rdst *rd = NULL;
 618        __be32 ip;
 619        __be16 port;
 620        u32 vni, ifindex;
 621        int err;
 622
 623        err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
 624        if (err)
 625                return err;
 626
 627        err = -ENOENT;
 628
 629        spin_lock_bh(&vxlan->hash_lock);
 630        f = vxlan_find_mac(vxlan, addr);
 631        if (!f)
 632                goto out;
 633
 634        if (ip != htonl(INADDR_ANY)) {
 635                rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
 636                if (!rd)
 637                        goto out;
 638        }
 639
 640        err = 0;
 641
 642        /* remove a destination if it's not the only one on the list,
 643         * otherwise destroy the fdb entry
 644         */
 645        if (rd && !list_is_singular(&f->remotes)) {
 646                list_del_rcu(&rd->list);
 647                call_rcu(&rd->rcu, vxlan_fdb_free_rdst);
 648                goto out;
 649        }
 650
 651        vxlan_fdb_destroy(vxlan, f);
 652
 653out:
 654        spin_unlock_bh(&vxlan->hash_lock);
 655
 656        return err;
 657}
 658
 659/* Dump forwarding table */
 660static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 661                          struct net_device *dev, int idx)
 662{
 663        struct vxlan_dev *vxlan = netdev_priv(dev);
 664        unsigned int h;
 665
 666        for (h = 0; h < FDB_HASH_SIZE; ++h) {
 667                struct vxlan_fdb *f;
 668                int err;
 669
 670                hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
 671                        struct vxlan_rdst *rd;
 672
 673                        if (idx < cb->args[0])
 674                                goto skip;
 675
 676                        list_for_each_entry_rcu(rd, &f->remotes, list) {
 677                                err = vxlan_fdb_info(skb, vxlan, f,
 678                                                     NETLINK_CB(cb->skb).portid,
 679                                                     cb->nlh->nlmsg_seq,
 680                                                     RTM_NEWNEIGH,
 681                                                     NLM_F_MULTI, rd);
 682                                if (err < 0)
 683                                        goto out;
 684                        }
 685skip:
 686                        ++idx;
 687                }
 688        }
 689out:
 690        return idx;
 691}
 692
 693/* Watch incoming packets to learn mapping between Ethernet address
 694 * and Tunnel endpoint.
 695 * Return true if packet is bogus and should be droppped.
 696 */
 697static bool vxlan_snoop(struct net_device *dev,
 698                        __be32 src_ip, const u8 *src_mac)
 699{
 700        struct vxlan_dev *vxlan = netdev_priv(dev);
 701        struct vxlan_fdb *f;
 702
 703        f = vxlan_find_mac(vxlan, src_mac);
 704        if (likely(f)) {
 705                struct vxlan_rdst *rdst = first_remote(f);
 706
 707                if (likely(rdst->remote_ip == src_ip))
 708                        return false;
 709
 710                /* Don't migrate static entries, drop packets */
 711                if (f->state & NUD_NOARP)
 712                        return true;
 713
 714                if (net_ratelimit())
 715                        netdev_info(dev,
 716                                    "%pM migrated from %pI4 to %pI4\n",
 717                                    src_mac, &rdst->remote_ip, &src_ip);
 718
 719                rdst->remote_ip = src_ip;
 720                f->updated = jiffies;
 721                vxlan_fdb_notify(vxlan, f, RTM_NEWNEIGH);
 722        } else {
 723                /* learned new entry */
 724                spin_lock(&vxlan->hash_lock);
 725
 726                /* close off race between vxlan_flush and incoming packets */
 727                if (netif_running(dev))
 728                        vxlan_fdb_create(vxlan, src_mac, src_ip,
 729                                         NUD_REACHABLE,
 730                                         NLM_F_EXCL|NLM_F_CREATE,
 731                                         vxlan->dst_port,
 732                                         vxlan->default_dst.remote_vni,
 733                                         0, NTF_SELF);
 734                spin_unlock(&vxlan->hash_lock);
 735        }
 736
 737        return false;
 738}
 739
 740/* See if multicast group is already in use by other ID */
 741static bool vxlan_group_used(struct vxlan_net *vn, __be32 remote_ip)
 742{
 743        struct vxlan_dev *vxlan;
 744
 745        list_for_each_entry(vxlan, &vn->vxlan_list, next) {
 746                if (!netif_running(vxlan->dev))
 747                        continue;
 748
 749                if (vxlan->default_dst.remote_ip == remote_ip)
 750                        return true;
 751        }
 752
 753        return false;
 754}
 755
 756static void vxlan_sock_hold(struct vxlan_sock *vs)
 757{
 758        atomic_inc(&vs->refcnt);
 759}
 760
 761static void vxlan_sock_release(struct vxlan_net *vn, struct vxlan_sock *vs)
 762{
 763        if (!atomic_dec_and_test(&vs->refcnt))
 764                return;
 765
 766        spin_lock(&vn->sock_lock);
 767        hlist_del_rcu(&vs->hlist);
 768        spin_unlock(&vn->sock_lock);
 769
 770        queue_work(vxlan_wq, &vs->del_work);
 771}
 772
 773/* Callback to update multicast group membership when first VNI on
 774 * multicast asddress is brought up
 775 * Done as workqueue because ip_mc_join_group acquires RTNL.
 776 */
 777static void vxlan_igmp_join(struct work_struct *work)
 778{
 779        struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_join);
 780        struct vxlan_net *vn = net_generic(dev_net(vxlan->dev), vxlan_net_id);
 781        struct vxlan_sock *vs = vxlan->vn_sock;
 782        struct sock *sk = vs->sock->sk;
 783        struct ip_mreqn mreq = {
 784                .imr_multiaddr.s_addr   = vxlan->default_dst.remote_ip,
 785                .imr_ifindex            = vxlan->default_dst.remote_ifindex,
 786        };
 787
 788        lock_sock(sk);
 789        ip_mc_join_group(sk, &mreq);
 790        release_sock(sk);
 791
 792        vxlan_sock_release(vn, vs);
 793        dev_put(vxlan->dev);
 794}
 795
 796/* Inverse of vxlan_igmp_join when last VNI is brought down */
 797static void vxlan_igmp_leave(struct work_struct *work)
 798{
 799        struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_leave);
 800        struct vxlan_net *vn = net_generic(dev_net(vxlan->dev), vxlan_net_id);
 801        struct vxlan_sock *vs = vxlan->vn_sock;
 802        struct sock *sk = vs->sock->sk;
 803        struct ip_mreqn mreq = {
 804                .imr_multiaddr.s_addr   = vxlan->default_dst.remote_ip,
 805                .imr_ifindex            = vxlan->default_dst.remote_ifindex,
 806        };
 807
 808        lock_sock(sk);
 809        ip_mc_leave_group(sk, &mreq);
 810        release_sock(sk);
 811
 812        vxlan_sock_release(vn, vs);
 813        dev_put(vxlan->dev);
 814}
 815
 816/* Callback from net/ipv4/udp.c to receive packets */
 817static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
 818{
 819        struct iphdr *oip;
 820        struct vxlanhdr *vxh;
 821        struct vxlan_dev *vxlan;
 822        struct pcpu_tstats *stats;
 823        __be16 port;
 824        __u32 vni;
 825        int err;
 826
 827        /* pop off outer UDP header */
 828        __skb_pull(skb, sizeof(struct udphdr));
 829
 830        /* Need Vxlan and inner Ethernet header to be present */
 831        if (!pskb_may_pull(skb, sizeof(struct vxlanhdr)))
 832                goto error;
 833
 834        /* Drop packets with reserved bits set */
 835        vxh = (struct vxlanhdr *) skb->data;
 836        if (vxh->vx_flags != htonl(VXLAN_FLAGS) ||
 837            (vxh->vx_vni & htonl(0xff))) {
 838                netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
 839                           ntohl(vxh->vx_flags), ntohl(vxh->vx_vni));
 840                goto error;
 841        }
 842
 843        __skb_pull(skb, sizeof(struct vxlanhdr));
 844
 845        /* Is this VNI defined? */
 846        vni = ntohl(vxh->vx_vni) >> 8;
 847        port = inet_sk(sk)->inet_sport;
 848        vxlan = vxlan_find_vni(sock_net(sk), vni, port);
 849        if (!vxlan) {
 850                netdev_dbg(skb->dev, "unknown vni %d port %u\n",
 851                           vni, ntohs(port));
 852                goto drop;
 853        }
 854
 855        if (!pskb_may_pull(skb, ETH_HLEN)) {
 856                vxlan->dev->stats.rx_length_errors++;
 857                vxlan->dev->stats.rx_errors++;
 858                goto drop;
 859        }
 860
 861        skb_reset_mac_header(skb);
 862
 863        /* Re-examine inner Ethernet packet */
 864        oip = ip_hdr(skb);
 865        skb->protocol = eth_type_trans(skb, vxlan->dev);
 866
 867        /* Ignore packet loops (and multicast echo) */
 868        if (compare_ether_addr(eth_hdr(skb)->h_source,
 869                               vxlan->dev->dev_addr) == 0)
 870                goto drop;
 871
 872        if ((vxlan->flags & VXLAN_F_LEARN) &&
 873            vxlan_snoop(skb->dev, oip->saddr, eth_hdr(skb)->h_source))
 874                goto drop;
 875
 876        __skb_tunnel_rx(skb, vxlan->dev);
 877        skb_reset_network_header(skb);
 878
 879        /* If the NIC driver gave us an encapsulated packet with
 880         * CHECKSUM_UNNECESSARY and Rx checksum feature is enabled,
 881         * leave the CHECKSUM_UNNECESSARY, the device checksummed it
 882         * for us. Otherwise force the upper layers to verify it.
 883         */
 884        if (skb->ip_summed != CHECKSUM_UNNECESSARY || !skb->encapsulation ||
 885            !(vxlan->dev->features & NETIF_F_RXCSUM))
 886                skb->ip_summed = CHECKSUM_NONE;
 887
 888        skb->encapsulation = 0;
 889
 890        err = IP_ECN_decapsulate(oip, skb);
 891        if (unlikely(err)) {
 892                if (log_ecn_error)
 893                        net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
 894                                             &oip->saddr, oip->tos);
 895                if (err > 1) {
 896                        ++vxlan->dev->stats.rx_frame_errors;
 897                        ++vxlan->dev->stats.rx_errors;
 898                        goto drop;
 899                }
 900        }
 901
 902        stats = this_cpu_ptr(vxlan->dev->tstats);
 903        u64_stats_update_begin(&stats->syncp);
 904        stats->rx_packets++;
 905        stats->rx_bytes += skb->len;
 906        u64_stats_update_end(&stats->syncp);
 907
 908        netif_rx(skb);
 909
 910        return 0;
 911error:
 912        /* Put UDP header back */
 913        __skb_push(skb, sizeof(struct udphdr));
 914
 915        return 1;
 916drop:
 917        /* Consume bad packet */
 918        kfree_skb(skb);
 919        return 0;
 920}
 921
 922static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
 923{
 924        struct vxlan_dev *vxlan = netdev_priv(dev);
 925        struct arphdr *parp;
 926        u8 *arpptr, *sha;
 927        __be32 sip, tip;
 928        struct neighbour *n;
 929
 930        if (dev->flags & IFF_NOARP)
 931                goto out;
 932
 933        if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
 934                dev->stats.tx_dropped++;
 935                goto out;
 936        }
 937        parp = arp_hdr(skb);
 938
 939        if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
 940             parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
 941            parp->ar_pro != htons(ETH_P_IP) ||
 942            parp->ar_op != htons(ARPOP_REQUEST) ||
 943            parp->ar_hln != dev->addr_len ||
 944            parp->ar_pln != 4)
 945                goto out;
 946        arpptr = (u8 *)parp + sizeof(struct arphdr);
 947        sha = arpptr;
 948        arpptr += dev->addr_len;        /* sha */
 949        memcpy(&sip, arpptr, sizeof(sip));
 950        arpptr += sizeof(sip);
 951        arpptr += dev->addr_len;        /* tha */
 952        memcpy(&tip, arpptr, sizeof(tip));
 953
 954        if (ipv4_is_loopback(tip) ||
 955            ipv4_is_multicast(tip))
 956                goto out;
 957
 958        n = neigh_lookup(&arp_tbl, &tip, dev);
 959
 960        if (n) {
 961                struct vxlan_fdb *f;
 962                struct sk_buff  *reply;
 963
 964                if (!(n->nud_state & NUD_CONNECTED)) {
 965                        neigh_release(n);
 966                        goto out;
 967                }
 968
 969                f = vxlan_find_mac(vxlan, n->ha);
 970                if (f && first_remote(f)->remote_ip == htonl(INADDR_ANY)) {
 971                        /* bridge-local neighbor */
 972                        neigh_release(n);
 973                        goto out;
 974                }
 975
 976                reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
 977                                n->ha, sha);
 978
 979                neigh_release(n);
 980
 981                skb_reset_mac_header(reply);
 982                __skb_pull(reply, skb_network_offset(reply));
 983                reply->ip_summed = CHECKSUM_UNNECESSARY;
 984                reply->pkt_type = PACKET_HOST;
 985
 986                if (netif_rx_ni(reply) == NET_RX_DROP)
 987                        dev->stats.rx_dropped++;
 988        } else if (vxlan->flags & VXLAN_F_L3MISS)
 989                vxlan_ip_miss(dev, tip);
 990out:
 991        consume_skb(skb);
 992        return NETDEV_TX_OK;
 993}
 994
 995static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
 996{
 997        struct vxlan_dev *vxlan = netdev_priv(dev);
 998        struct neighbour *n;
 999        struct iphdr *pip;
1000
1001        if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1002                return false;
1003
1004        n = NULL;
1005        switch (ntohs(eth_hdr(skb)->h_proto)) {
1006        case ETH_P_IP:
1007                if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1008                        return false;
1009                pip = ip_hdr(skb);
1010                n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1011                break;
1012        default:
1013                return false;
1014        }
1015
1016        if (n) {
1017                bool diff;
1018
1019                diff = compare_ether_addr(eth_hdr(skb)->h_dest, n->ha) != 0;
1020                if (diff) {
1021                        memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1022                                dev->addr_len);
1023                        memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1024                }
1025                neigh_release(n);
1026                return diff;
1027        } else if (vxlan->flags & VXLAN_F_L3MISS)
1028                vxlan_ip_miss(dev, pip->daddr);
1029        return false;
1030}
1031
1032static void vxlan_sock_put(struct sk_buff *skb)
1033{
1034        sock_put(skb->sk);
1035}
1036
1037/* On transmit, associate with the tunnel socket */
1038static void vxlan_set_owner(struct net_device *dev, struct sk_buff *skb)
1039{
1040        struct vxlan_dev *vxlan = netdev_priv(dev);
1041        struct sock *sk = vxlan->vn_sock->sock->sk;
1042
1043        skb_orphan(skb);
1044        sock_hold(sk);
1045        skb->sk = sk;
1046        skb->destructor = vxlan_sock_put;
1047}
1048
1049/* Compute source port for outgoing packet
1050 *   first choice to use L4 flow hash since it will spread
1051 *     better and maybe available from hardware
1052 *   secondary choice is to use jhash on the Ethernet header
1053 */
1054static __be16 vxlan_src_port(const struct vxlan_dev *vxlan, struct sk_buff *skb)
1055{
1056        unsigned int range = (vxlan->port_max - vxlan->port_min) + 1;
1057        u32 hash;
1058
1059        hash = skb_get_rxhash(skb);
1060        if (!hash)
1061                hash = jhash(skb->data, 2 * ETH_ALEN,
1062                             (__force u32) skb->protocol);
1063
1064        return htons((((u64) hash * range) >> 32) + vxlan->port_min);
1065}
1066
1067static int handle_offloads(struct sk_buff *skb)
1068{
1069        if (skb_is_gso(skb)) {
1070                int err = skb_unclone(skb, GFP_ATOMIC);
1071                if (unlikely(err))
1072                        return err;
1073
1074                skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_TUNNEL;
1075        } else if (skb->ip_summed != CHECKSUM_PARTIAL)
1076                skb->ip_summed = CHECKSUM_NONE;
1077
1078        return 0;
1079}
1080
1081/* Bypass encapsulation if the destination is local */
1082static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1083                               struct vxlan_dev *dst_vxlan)
1084{
1085        struct pcpu_tstats *tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1086        struct pcpu_tstats *rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1087
1088        skb->pkt_type = PACKET_HOST;
1089        skb->encapsulation = 0;
1090        skb->dev = dst_vxlan->dev;
1091        __skb_pull(skb, skb_network_offset(skb));
1092
1093        if (dst_vxlan->flags & VXLAN_F_LEARN)
1094                vxlan_snoop(skb->dev, htonl(INADDR_LOOPBACK),
1095                            eth_hdr(skb)->h_source);
1096
1097        u64_stats_update_begin(&tx_stats->syncp);
1098        tx_stats->tx_packets++;
1099        tx_stats->tx_bytes += skb->len;
1100        u64_stats_update_end(&tx_stats->syncp);
1101
1102        if (netif_rx(skb) == NET_RX_SUCCESS) {
1103                u64_stats_update_begin(&rx_stats->syncp);
1104                rx_stats->rx_packets++;
1105                rx_stats->rx_bytes += skb->len;
1106                u64_stats_update_end(&rx_stats->syncp);
1107        } else {
1108                skb->dev->stats.rx_dropped++;
1109        }
1110}
1111
1112static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1113                           struct vxlan_rdst *rdst, bool did_rsc)
1114{
1115        struct vxlan_dev *vxlan = netdev_priv(dev);
1116        struct rtable *rt;
1117        const struct iphdr *old_iph;
1118        struct vxlanhdr *vxh;
1119        struct udphdr *uh;
1120        struct flowi4 fl4;
1121        __be32 dst;
1122        __be16 src_port, dst_port;
1123        u32 vni;
1124        __be16 df = 0;
1125        __u8 tos, ttl;
1126        int err;
1127
1128        dst_port = rdst->remote_port ? rdst->remote_port : vxlan->dst_port;
1129        vni = rdst->remote_vni;
1130        dst = rdst->remote_ip;
1131
1132        if (!dst) {
1133                if (did_rsc) {
1134                        /* short-circuited back to local bridge */
1135                        vxlan_encap_bypass(skb, vxlan, vxlan);
1136                        return;
1137                }
1138                goto drop;
1139        }
1140
1141        if (!skb->encapsulation) {
1142                skb_reset_inner_headers(skb);
1143                skb->encapsulation = 1;
1144        }
1145
1146        /* Need space for new headers (invalidates iph ptr) */
1147        if (skb_cow_head(skb, VXLAN_HEADROOM))
1148                goto drop;
1149
1150        old_iph = ip_hdr(skb);
1151
1152        ttl = vxlan->ttl;
1153        if (!ttl && IN_MULTICAST(ntohl(dst)))
1154                ttl = 1;
1155
1156        tos = vxlan->tos;
1157        if (tos == 1)
1158                tos = ip_tunnel_get_dsfield(old_iph, skb);
1159
1160        src_port = vxlan_src_port(vxlan, skb);
1161
1162        memset(&fl4, 0, sizeof(fl4));
1163        fl4.flowi4_oif = rdst->remote_ifindex;
1164        fl4.flowi4_tos = RT_TOS(tos);
1165        fl4.daddr = dst;
1166        fl4.saddr = vxlan->saddr;
1167
1168        rt = ip_route_output_key(dev_net(dev), &fl4);
1169        if (IS_ERR(rt)) {
1170                netdev_dbg(dev, "no route to %pI4\n", &dst);
1171                dev->stats.tx_carrier_errors++;
1172                goto tx_error;
1173        }
1174
1175        if (rt->dst.dev == dev) {
1176                netdev_dbg(dev, "circular route to %pI4\n", &dst);
1177                ip_rt_put(rt);
1178                dev->stats.collisions++;
1179                goto tx_error;
1180        }
1181
1182        /* Bypass encapsulation if the destination is local */
1183        if (rt->rt_flags & RTCF_LOCAL &&
1184            !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1185                struct vxlan_dev *dst_vxlan;
1186
1187                ip_rt_put(rt);
1188                dst_vxlan = vxlan_find_vni(dev_net(dev), vni, dst_port);
1189                if (!dst_vxlan)
1190                        goto tx_error;
1191                vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1192                return;
1193        }
1194        vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1195        vxh->vx_flags = htonl(VXLAN_FLAGS);
1196        vxh->vx_vni = htonl(vni << 8);
1197
1198        __skb_push(skb, sizeof(*uh));
1199        skb_reset_transport_header(skb);
1200        uh = udp_hdr(skb);
1201
1202        uh->dest = dst_port;
1203        uh->source = src_port;
1204
1205        uh->len = htons(skb->len);
1206        uh->check = 0;
1207
1208        vxlan_set_owner(dev, skb);
1209
1210        if (handle_offloads(skb))
1211                goto drop;
1212
1213        tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
1214        ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
1215
1216        err = iptunnel_xmit(dev_net(dev), rt, skb, fl4.saddr, dst,
1217                            IPPROTO_UDP, tos, ttl, df);
1218        iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
1219
1220        return;
1221
1222drop:
1223        dev->stats.tx_dropped++;
1224        goto tx_free;
1225
1226tx_error:
1227        dev->stats.tx_errors++;
1228tx_free:
1229        dev_kfree_skb(skb);
1230}
1231
1232/* Transmit local packets over Vxlan
1233 *
1234 * Outer IP header inherits ECN and DF from inner header.
1235 * Outer UDP destination is the VXLAN assigned port.
1236 *           source port is based on hash of flow
1237 */
1238static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
1239{
1240        struct vxlan_dev *vxlan = netdev_priv(dev);
1241        struct ethhdr *eth;
1242        bool did_rsc = false;
1243        struct vxlan_rdst *rdst;
1244        struct vxlan_fdb *f;
1245
1246        skb_reset_mac_header(skb);
1247        eth = eth_hdr(skb);
1248
1249        if ((vxlan->flags & VXLAN_F_PROXY) && ntohs(eth->h_proto) == ETH_P_ARP)
1250                return arp_reduce(dev, skb);
1251
1252        f = vxlan_find_mac(vxlan, eth->h_dest);
1253        did_rsc = false;
1254
1255        if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
1256            ntohs(eth->h_proto) == ETH_P_IP) {
1257                did_rsc = route_shortcircuit(dev, skb);
1258                if (did_rsc)
1259                        f = vxlan_find_mac(vxlan, eth->h_dest);
1260        }
1261
1262        if (f == NULL) {
1263                f = vxlan_find_mac(vxlan, all_zeros_mac);
1264                if (f == NULL) {
1265                        if ((vxlan->flags & VXLAN_F_L2MISS) &&
1266                            !is_multicast_ether_addr(eth->h_dest))
1267                                vxlan_fdb_miss(vxlan, eth->h_dest);
1268
1269                        dev->stats.tx_dropped++;
1270                        dev_kfree_skb(skb);
1271                        return NETDEV_TX_OK;
1272                }
1273        }
1274
1275        list_for_each_entry_rcu(rdst, &f->remotes, list) {
1276                struct sk_buff *skb1;
1277
1278                skb1 = skb_clone(skb, GFP_ATOMIC);
1279                if (skb1)
1280                        vxlan_xmit_one(skb1, dev, rdst, did_rsc);
1281        }
1282
1283        dev_kfree_skb(skb);
1284        return NETDEV_TX_OK;
1285}
1286
1287/* Walk the forwarding table and purge stale entries */
1288static void vxlan_cleanup(unsigned long arg)
1289{
1290        struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
1291        unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
1292        unsigned int h;
1293
1294        if (!netif_running(vxlan->dev))
1295                return;
1296
1297        spin_lock_bh(&vxlan->hash_lock);
1298        for (h = 0; h < FDB_HASH_SIZE; ++h) {
1299                struct hlist_node *p, *n;
1300                hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
1301                        struct vxlan_fdb *f
1302                                = container_of(p, struct vxlan_fdb, hlist);
1303                        unsigned long timeout;
1304
1305                        if (f->state & NUD_PERMANENT)
1306                                continue;
1307
1308                        timeout = f->used + vxlan->age_interval * HZ;
1309                        if (time_before_eq(timeout, jiffies)) {
1310                                netdev_dbg(vxlan->dev,
1311                                           "garbage collect %pM\n",
1312                                           f->eth_addr);
1313                                f->state = NUD_STALE;
1314                                vxlan_fdb_destroy(vxlan, f);
1315                        } else if (time_before(timeout, next_timer))
1316                                next_timer = timeout;
1317                }
1318        }
1319        spin_unlock_bh(&vxlan->hash_lock);
1320
1321        mod_timer(&vxlan->age_timer, next_timer);
1322}
1323
1324/* Setup stats when device is created */
1325static int vxlan_init(struct net_device *dev)
1326{
1327        struct vxlan_dev *vxlan = netdev_priv(dev);
1328        struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
1329        struct vxlan_sock *vs;
1330        __u32 vni = vxlan->default_dst.remote_vni;
1331
1332        dev->tstats = alloc_percpu(struct pcpu_tstats);
1333        if (!dev->tstats)
1334                return -ENOMEM;
1335
1336        spin_lock(&vn->sock_lock);
1337        vs = vxlan_find_port(dev_net(dev), vxlan->dst_port);
1338        if (vs) {
1339                /* If we have a socket with same port already, reuse it */
1340                atomic_inc(&vs->refcnt);
1341                vxlan->vn_sock = vs;
1342                hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
1343        } else {
1344                /* otherwise make new socket outside of RTNL */
1345                dev_hold(dev);
1346                queue_work(vxlan_wq, &vxlan->sock_work);
1347        }
1348        spin_unlock(&vn->sock_lock);
1349
1350        return 0;
1351}
1352
1353static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
1354{
1355        struct vxlan_fdb *f;
1356
1357        spin_lock_bh(&vxlan->hash_lock);
1358        f = __vxlan_find_mac(vxlan, all_zeros_mac);
1359        if (f)
1360                vxlan_fdb_destroy(vxlan, f);
1361        spin_unlock_bh(&vxlan->hash_lock);
1362}
1363
1364static void vxlan_uninit(struct net_device *dev)
1365{
1366        struct vxlan_dev *vxlan = netdev_priv(dev);
1367        struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
1368        struct vxlan_sock *vs = vxlan->vn_sock;
1369
1370        vxlan_fdb_delete_default(vxlan);
1371
1372        if (vs)
1373                vxlan_sock_release(vn, vs);
1374        free_percpu(dev->tstats);
1375}
1376
1377/* Start ageing timer and join group when device is brought up */
1378static int vxlan_open(struct net_device *dev)
1379{
1380        struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
1381        struct vxlan_dev *vxlan = netdev_priv(dev);
1382        struct vxlan_sock *vs = vxlan->vn_sock;
1383
1384        /* socket hasn't been created */
1385        if (!vs)
1386                return -ENOTCONN;
1387
1388        if (IN_MULTICAST(ntohl(vxlan->default_dst.remote_ip)) &&
1389            vxlan_group_used(vn, vxlan->default_dst.remote_ip)) {
1390                vxlan_sock_hold(vs);
1391                dev_hold(dev);
1392                queue_work(vxlan_wq, &vxlan->igmp_join);
1393        }
1394
1395        if (vxlan->age_interval)
1396                mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
1397
1398        return 0;
1399}
1400
1401/* Purge the forwarding table */
1402static void vxlan_flush(struct vxlan_dev *vxlan)
1403{
1404        unsigned int h;
1405
1406        spin_lock_bh(&vxlan->hash_lock);
1407        for (h = 0; h < FDB_HASH_SIZE; ++h) {
1408                struct hlist_node *p, *n;
1409                hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
1410                        struct vxlan_fdb *f
1411                                = container_of(p, struct vxlan_fdb, hlist);
1412                        /* the all_zeros_mac entry is deleted at vxlan_uninit */
1413                        if (!is_zero_ether_addr(f->eth_addr))
1414                                vxlan_fdb_destroy(vxlan, f);
1415                }
1416        }
1417        spin_unlock_bh(&vxlan->hash_lock);
1418}
1419
1420/* Cleanup timer and forwarding table on shutdown */
1421static int vxlan_stop(struct net_device *dev)
1422{
1423        struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
1424        struct vxlan_dev *vxlan = netdev_priv(dev);
1425        struct vxlan_sock *vs = vxlan->vn_sock;
1426
1427        if (vs && IN_MULTICAST(ntohl(vxlan->default_dst.remote_ip)) &&
1428            ! vxlan_group_used(vn, vxlan->default_dst.remote_ip)) {
1429                vxlan_sock_hold(vs);
1430                dev_hold(dev);
1431                queue_work(vxlan_wq, &vxlan->igmp_leave);
1432        }
1433
1434        del_timer_sync(&vxlan->age_timer);
1435
1436        vxlan_flush(vxlan);
1437
1438        return 0;
1439}
1440
1441/* Stub, nothing needs to be done. */
1442static void vxlan_set_multicast_list(struct net_device *dev)
1443{
1444}
1445
1446static const struct net_device_ops vxlan_netdev_ops = {
1447        .ndo_init               = vxlan_init,
1448        .ndo_uninit             = vxlan_uninit,
1449        .ndo_open               = vxlan_open,
1450        .ndo_stop               = vxlan_stop,
1451        .ndo_start_xmit         = vxlan_xmit,
1452        .ndo_get_stats64        = ip_tunnel_get_stats64,
1453        .ndo_set_rx_mode        = vxlan_set_multicast_list,
1454        .ndo_change_mtu         = eth_change_mtu,
1455        .ndo_validate_addr      = eth_validate_addr,
1456        .ndo_set_mac_address    = eth_mac_addr,
1457        .ndo_fdb_add            = vxlan_fdb_add,
1458        .ndo_fdb_del            = vxlan_fdb_delete,
1459        .ndo_fdb_dump           = vxlan_fdb_dump,
1460};
1461
1462/* Info for udev, that this is a virtual tunnel endpoint */
1463static struct device_type vxlan_type = {
1464        .name = "vxlan",
1465};
1466
1467/* Initialize the device structure. */
1468static void vxlan_setup(struct net_device *dev)
1469{
1470        struct vxlan_dev *vxlan = netdev_priv(dev);
1471        unsigned int h;
1472        int low, high;
1473
1474        eth_hw_addr_random(dev);
1475        ether_setup(dev);
1476        dev->hard_header_len = ETH_HLEN + VXLAN_HEADROOM;
1477
1478        dev->netdev_ops = &vxlan_netdev_ops;
1479        dev->destructor = free_netdev;
1480        SET_NETDEV_DEVTYPE(dev, &vxlan_type);
1481
1482        dev->tx_queue_len = 0;
1483        dev->features   |= NETIF_F_LLTX;
1484        dev->features   |= NETIF_F_NETNS_LOCAL;
1485        dev->features   |= NETIF_F_SG | NETIF_F_HW_CSUM;
1486        dev->features   |= NETIF_F_RXCSUM;
1487        dev->features   |= NETIF_F_GSO_SOFTWARE;
1488
1489        dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
1490        dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1491        dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1492        dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1493
1494        INIT_LIST_HEAD(&vxlan->next);
1495        spin_lock_init(&vxlan->hash_lock);
1496        INIT_WORK(&vxlan->igmp_join, vxlan_igmp_join);
1497        INIT_WORK(&vxlan->igmp_leave, vxlan_igmp_leave);
1498        INIT_WORK(&vxlan->sock_work, vxlan_sock_work);
1499
1500        init_timer_deferrable(&vxlan->age_timer);
1501        vxlan->age_timer.function = vxlan_cleanup;
1502        vxlan->age_timer.data = (unsigned long) vxlan;
1503
1504        inet_get_local_port_range(&low, &high);
1505        vxlan->port_min = low;
1506        vxlan->port_max = high;
1507        vxlan->dst_port = htons(vxlan_port);
1508
1509        vxlan->dev = dev;
1510
1511        for (h = 0; h < FDB_HASH_SIZE; ++h)
1512                INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
1513}
1514
1515static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
1516        [IFLA_VXLAN_ID]         = { .type = NLA_U32 },
1517        [IFLA_VXLAN_GROUP]      = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
1518        [IFLA_VXLAN_LINK]       = { .type = NLA_U32 },
1519        [IFLA_VXLAN_LOCAL]      = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
1520        [IFLA_VXLAN_TOS]        = { .type = NLA_U8 },
1521        [IFLA_VXLAN_TTL]        = { .type = NLA_U8 },
1522        [IFLA_VXLAN_LEARNING]   = { .type = NLA_U8 },
1523        [IFLA_VXLAN_AGEING]     = { .type = NLA_U32 },
1524        [IFLA_VXLAN_LIMIT]      = { .type = NLA_U32 },
1525        [IFLA_VXLAN_PORT_RANGE] = { .len  = sizeof(struct ifla_vxlan_port_range) },
1526        [IFLA_VXLAN_PROXY]      = { .type = NLA_U8 },
1527        [IFLA_VXLAN_RSC]        = { .type = NLA_U8 },
1528        [IFLA_VXLAN_L2MISS]     = { .type = NLA_U8 },
1529        [IFLA_VXLAN_L3MISS]     = { .type = NLA_U8 },
1530        [IFLA_VXLAN_PORT]       = { .type = NLA_U16 },
1531};
1532
1533static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
1534{
1535        if (tb[IFLA_ADDRESS]) {
1536                if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
1537                        pr_debug("invalid link address (not ethernet)\n");
1538                        return -EINVAL;
1539                }
1540
1541                if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
1542                        pr_debug("invalid all zero ethernet address\n");
1543                        return -EADDRNOTAVAIL;
1544                }
1545        }
1546
1547        if (!data)
1548                return -EINVAL;
1549
1550        if (data[IFLA_VXLAN_ID]) {
1551                __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
1552                if (id >= VXLAN_VID_MASK)
1553                        return -ERANGE;
1554        }
1555
1556        if (data[IFLA_VXLAN_PORT_RANGE]) {
1557                const struct ifla_vxlan_port_range *p
1558                        = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
1559
1560                if (ntohs(p->high) < ntohs(p->low)) {
1561                        pr_debug("port range %u .. %u not valid\n",
1562                                 ntohs(p->low), ntohs(p->high));
1563                        return -EINVAL;
1564                }
1565        }
1566
1567        return 0;
1568}
1569
1570static void vxlan_get_drvinfo(struct net_device *netdev,
1571                              struct ethtool_drvinfo *drvinfo)
1572{
1573        strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
1574        strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
1575}
1576
1577static const struct ethtool_ops vxlan_ethtool_ops = {
1578        .get_drvinfo    = vxlan_get_drvinfo,
1579        .get_link       = ethtool_op_get_link,
1580};
1581
1582static void vxlan_del_work(struct work_struct *work)
1583{
1584        struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
1585
1586        sk_release_kernel(vs->sock->sk);
1587        kfree_rcu(vs, rcu);
1588}
1589
1590static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port)
1591{
1592        struct vxlan_sock *vs;
1593        struct sock *sk;
1594        struct sockaddr_in vxlan_addr = {
1595                .sin_family = AF_INET,
1596                .sin_addr.s_addr = htonl(INADDR_ANY),
1597                .sin_port = port,
1598        };
1599        int rc;
1600        unsigned int h;
1601
1602        vs = kmalloc(sizeof(*vs), GFP_KERNEL);
1603        if (!vs)
1604                return ERR_PTR(-ENOMEM);
1605
1606        for (h = 0; h < VNI_HASH_SIZE; ++h)
1607                INIT_HLIST_HEAD(&vs->vni_list[h]);
1608
1609        INIT_WORK(&vs->del_work, vxlan_del_work);
1610
1611        /* Create UDP socket for encapsulation receive. */
1612        rc = sock_create_kern(AF_INET, SOCK_DGRAM, IPPROTO_UDP, &vs->sock);
1613        if (rc < 0) {
1614                pr_debug("UDP socket create failed\n");
1615                kfree(vs);
1616                return ERR_PTR(rc);
1617        }
1618
1619        /* Put in proper namespace */
1620        sk = vs->sock->sk;
1621        sk_change_net(sk, net);
1622
1623        rc = kernel_bind(vs->sock, (struct sockaddr *) &vxlan_addr,
1624                         sizeof(vxlan_addr));
1625        if (rc < 0) {
1626                pr_debug("bind for UDP socket %pI4:%u (%d)\n",
1627                         &vxlan_addr.sin_addr, ntohs(vxlan_addr.sin_port), rc);
1628                sk_release_kernel(sk);
1629                kfree(vs);
1630                return ERR_PTR(rc);
1631        }
1632
1633        /* Disable multicast loopback */
1634        inet_sk(sk)->mc_loop = 0;
1635
1636        /* Mark socket as an encapsulation socket. */
1637        udp_sk(sk)->encap_type = 1;
1638        udp_sk(sk)->encap_rcv = vxlan_udp_encap_recv;
1639        udp_encap_enable();
1640        atomic_set(&vs->refcnt, 1);
1641
1642        return vs;
1643}
1644
1645/* Scheduled at device creation to bind to a socket */
1646static void vxlan_sock_work(struct work_struct *work)
1647{
1648        struct vxlan_dev *vxlan
1649                = container_of(work, struct vxlan_dev, sock_work);
1650        struct net_device *dev = vxlan->dev;
1651        struct net *net = dev_net(dev);
1652        __u32 vni = vxlan->default_dst.remote_vni;
1653        __be16 port = vxlan->dst_port;
1654        struct vxlan_net *vn = net_generic(net, vxlan_net_id);
1655        struct vxlan_sock *nvs, *ovs;
1656
1657        nvs = vxlan_socket_create(net, port);
1658        if (IS_ERR(nvs)) {
1659                netdev_err(vxlan->dev, "Can not create UDP socket, %ld\n",
1660                           PTR_ERR(nvs));
1661                goto out;
1662        }
1663
1664        spin_lock(&vn->sock_lock);
1665        /* Look again to see if can reuse socket */
1666        ovs = vxlan_find_port(net, port);
1667        if (ovs) {
1668                atomic_inc(&ovs->refcnt);
1669                vxlan->vn_sock = ovs;
1670                hlist_add_head_rcu(&vxlan->hlist, vni_head(ovs, vni));
1671                spin_unlock(&vn->sock_lock);
1672
1673                sk_release_kernel(nvs->sock->sk);
1674                kfree(nvs);
1675        } else {
1676                vxlan->vn_sock = nvs;
1677                hlist_add_head_rcu(&nvs->hlist, vs_head(net, port));
1678                hlist_add_head_rcu(&vxlan->hlist, vni_head(nvs, vni));
1679                spin_unlock(&vn->sock_lock);
1680        }
1681out:
1682        dev_put(dev);
1683}
1684
1685static int vxlan_newlink(struct net *net, struct net_device *dev,
1686                         struct nlattr *tb[], struct nlattr *data[])
1687{
1688        struct vxlan_net *vn = net_generic(net, vxlan_net_id);
1689        struct vxlan_dev *vxlan = netdev_priv(dev);
1690        struct vxlan_rdst *dst = &vxlan->default_dst;
1691        __u32 vni;
1692        int err;
1693
1694        if (!data[IFLA_VXLAN_ID])
1695                return -EINVAL;
1696
1697        vni = nla_get_u32(data[IFLA_VXLAN_ID]);
1698        dst->remote_vni = vni;
1699
1700        if (data[IFLA_VXLAN_GROUP])
1701                dst->remote_ip = nla_get_be32(data[IFLA_VXLAN_GROUP]);
1702
1703        if (data[IFLA_VXLAN_LOCAL])
1704                vxlan->saddr = nla_get_be32(data[IFLA_VXLAN_LOCAL]);
1705
1706        if (data[IFLA_VXLAN_LINK] &&
1707            (dst->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]))) {
1708                struct net_device *lowerdev
1709                         = __dev_get_by_index(net, dst->remote_ifindex);
1710
1711                if (!lowerdev) {
1712                        pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
1713                        return -ENODEV;
1714                }
1715
1716                if (!tb[IFLA_MTU])
1717                        dev->mtu = lowerdev->mtu - VXLAN_HEADROOM;
1718
1719                /* update header length based on lower device */
1720                dev->hard_header_len = lowerdev->hard_header_len +
1721                                       VXLAN_HEADROOM;
1722        }
1723
1724        if (data[IFLA_VXLAN_TOS])
1725                vxlan->tos  = nla_get_u8(data[IFLA_VXLAN_TOS]);
1726
1727        if (data[IFLA_VXLAN_TTL])
1728                vxlan->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
1729
1730        if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
1731                vxlan->flags |= VXLAN_F_LEARN;
1732
1733        if (data[IFLA_VXLAN_AGEING])
1734                vxlan->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
1735        else
1736                vxlan->age_interval = FDB_AGE_DEFAULT;
1737
1738        if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
1739                vxlan->flags |= VXLAN_F_PROXY;
1740
1741        if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
1742                vxlan->flags |= VXLAN_F_RSC;
1743
1744        if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
1745                vxlan->flags |= VXLAN_F_L2MISS;
1746
1747        if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
1748                vxlan->flags |= VXLAN_F_L3MISS;
1749
1750        if (data[IFLA_VXLAN_LIMIT])
1751                vxlan->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
1752
1753        if (data[IFLA_VXLAN_PORT_RANGE]) {
1754                const struct ifla_vxlan_port_range *p
1755                        = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
1756                vxlan->port_min = ntohs(p->low);
1757                vxlan->port_max = ntohs(p->high);
1758        }
1759
1760        if (data[IFLA_VXLAN_PORT])
1761                vxlan->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
1762
1763        if (vxlan_find_vni(net, vni, vxlan->dst_port)) {
1764                pr_info("duplicate VNI %u\n", vni);
1765                return -EEXIST;
1766        }
1767
1768        SET_ETHTOOL_OPS(dev, &vxlan_ethtool_ops);
1769
1770        /* create an fdb entry for default destination */
1771        err = vxlan_fdb_create(vxlan, all_zeros_mac,
1772                               vxlan->default_dst.remote_ip,
1773                               NUD_REACHABLE|NUD_PERMANENT,
1774                               NLM_F_EXCL|NLM_F_CREATE,
1775                               vxlan->dst_port, vxlan->default_dst.remote_vni,
1776                               vxlan->default_dst.remote_ifindex, NTF_SELF);
1777        if (err)
1778                return err;
1779
1780        err = register_netdevice(dev);
1781        if (err) {
1782                vxlan_fdb_delete_default(vxlan);
1783                return err;
1784        }
1785
1786        list_add(&vxlan->next, &vn->vxlan_list);
1787
1788        return 0;
1789}
1790
1791static void vxlan_dellink(struct net_device *dev, struct list_head *head)
1792{
1793        struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
1794        struct vxlan_dev *vxlan = netdev_priv(dev);
1795
1796        spin_lock(&vn->sock_lock);
1797        hlist_del_rcu(&vxlan->hlist);
1798        spin_unlock(&vn->sock_lock);
1799
1800        list_del(&vxlan->next);
1801        unregister_netdevice_queue(dev, head);
1802}
1803
1804static size_t vxlan_get_size(const struct net_device *dev)
1805{
1806
1807        return nla_total_size(sizeof(__u32)) +  /* IFLA_VXLAN_ID */
1808                nla_total_size(sizeof(__be32)) +/* IFLA_VXLAN_GROUP */
1809                nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
1810                nla_total_size(sizeof(__be32))+ /* IFLA_VXLAN_LOCAL */
1811                nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TTL */
1812                nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TOS */
1813                nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_LEARNING */
1814                nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_PROXY */
1815                nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_RSC */
1816                nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L2MISS */
1817                nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L3MISS */
1818                nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
1819                nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
1820                nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
1821                nla_total_size(sizeof(__be16))+ /* IFLA_VXLAN_PORT */
1822                0;
1823}
1824
1825static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
1826{
1827        const struct vxlan_dev *vxlan = netdev_priv(dev);
1828        const struct vxlan_rdst *dst = &vxlan->default_dst;
1829        struct ifla_vxlan_port_range ports = {
1830                .low =  htons(vxlan->port_min),
1831                .high = htons(vxlan->port_max),
1832        };
1833
1834        if (nla_put_u32(skb, IFLA_VXLAN_ID, dst->remote_vni))
1835                goto nla_put_failure;
1836
1837        if (dst->remote_ip && nla_put_be32(skb, IFLA_VXLAN_GROUP, dst->remote_ip))
1838                goto nla_put_failure;
1839
1840        if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
1841                goto nla_put_failure;
1842
1843        if (vxlan->saddr && nla_put_be32(skb, IFLA_VXLAN_LOCAL, vxlan->saddr))
1844                goto nla_put_failure;
1845
1846        if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->ttl) ||
1847            nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->tos) ||
1848            nla_put_u8(skb, IFLA_VXLAN_LEARNING,
1849                        !!(vxlan->flags & VXLAN_F_LEARN)) ||
1850            nla_put_u8(skb, IFLA_VXLAN_PROXY,
1851                        !!(vxlan->flags & VXLAN_F_PROXY)) ||
1852            nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
1853            nla_put_u8(skb, IFLA_VXLAN_L2MISS,
1854                        !!(vxlan->flags & VXLAN_F_L2MISS)) ||
1855            nla_put_u8(skb, IFLA_VXLAN_L3MISS,
1856                        !!(vxlan->flags & VXLAN_F_L3MISS)) ||
1857            nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->age_interval) ||
1858            nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->addrmax) ||
1859            nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->dst_port))
1860                goto nla_put_failure;
1861
1862        if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
1863                goto nla_put_failure;
1864
1865        return 0;
1866
1867nla_put_failure:
1868        return -EMSGSIZE;
1869}
1870
1871static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
1872        .kind           = "vxlan",
1873        .maxtype        = IFLA_VXLAN_MAX,
1874        .policy         = vxlan_policy,
1875        .priv_size      = sizeof(struct vxlan_dev),
1876        .setup          = vxlan_setup,
1877        .validate       = vxlan_validate,
1878        .newlink        = vxlan_newlink,
1879        .dellink        = vxlan_dellink,
1880        .get_size       = vxlan_get_size,
1881        .fill_info      = vxlan_fill_info,
1882};
1883
1884static __net_init int vxlan_init_net(struct net *net)
1885{
1886        struct vxlan_net *vn = net_generic(net, vxlan_net_id);
1887        unsigned int h;
1888
1889        INIT_LIST_HEAD(&vn->vxlan_list);
1890        spin_lock_init(&vn->sock_lock);
1891
1892        for (h = 0; h < PORT_HASH_SIZE; ++h)
1893                INIT_HLIST_HEAD(&vn->sock_list[h]);
1894
1895        return 0;
1896}
1897
1898static __net_exit void vxlan_exit_net(struct net *net)
1899{
1900        struct vxlan_net *vn = net_generic(net, vxlan_net_id);
1901        struct vxlan_dev *vxlan;
1902        LIST_HEAD(list);
1903
1904        rtnl_lock();
1905        list_for_each_entry(vxlan, &vn->vxlan_list, next)
1906                unregister_netdevice_queue(vxlan->dev, &list);
1907        unregister_netdevice_many(&list);
1908        rtnl_unlock();
1909}
1910
1911static struct pernet_operations vxlan_net_ops = {
1912        .init = vxlan_init_net,
1913        .exit = vxlan_exit_net,
1914        .id   = &vxlan_net_id,
1915        .size = sizeof(struct vxlan_net),
1916};
1917
1918static int __init vxlan_init_module(void)
1919{
1920        int rc;
1921
1922        vxlan_wq = alloc_workqueue("vxlan", 0, 0);
1923        if (!vxlan_wq)
1924                return -ENOMEM;
1925
1926        get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
1927
1928        rc = register_pernet_device(&vxlan_net_ops);
1929        if (rc)
1930                goto out1;
1931
1932        rc = rtnl_link_register(&vxlan_link_ops);
1933        if (rc)
1934                goto out2;
1935
1936        return 0;
1937
1938out2:
1939        unregister_pernet_device(&vxlan_net_ops);
1940out1:
1941        destroy_workqueue(vxlan_wq);
1942        return rc;
1943}
1944late_initcall(vxlan_init_module);
1945
1946static void __exit vxlan_cleanup_module(void)
1947{
1948        rtnl_link_unregister(&vxlan_link_ops);
1949        destroy_workqueue(vxlan_wq);
1950        unregister_pernet_device(&vxlan_net_ops);
1951        rcu_barrier();
1952}
1953module_exit(vxlan_cleanup_module);
1954
1955MODULE_LICENSE("GPL");
1956MODULE_VERSION(VXLAN_VERSION);
1957MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
1958MODULE_ALIAS_RTNL_LINK("vxlan");
1959
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