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vxlan: fix out of order operation on module removal
[mirror_ubuntu-artful-kernel.git] / drivers / net / vxlan.c
CommitLineData
d342894c 1/*
eb5ce439 2 * VXLAN: Virtual eXtensible Local Area Network
d342894c 3 *
3b8df3c6 4 * Copyright (c) 2012-2013 Vyatta Inc.
d342894c 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
d342894c 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>
d342894c 30#include <linux/hash.h>
1b13c97f 31#include <linux/ethtool.h>
e4f67add
DS		 32#include <net/arp.h>
33#include <net/ndisc.h>
d342894c 34#include <net/ip.h>
c5441932 35#include <net/ip_tunnels.h>
d342894c 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
553675fb 47#define PORT_HASH_BITS 8
48#define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
d342894c 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)
52b702ff
AD		 58/* IP header + UDP + VXLAN + Ethernet header */
59#define VXLAN_HEADROOM (20 + 8 + 8 + 14)
d342894c 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
23c578bf 69/* UDP port for VXLAN traffic.
70 * The IANA assigned port is 4789, but the Linux default is 8472
71 * for compatability with early adopters.
72 */
d342894c 73static unsigned int vxlan_port __read_mostly = 8472;
74module_param_named(udp_port, vxlan_port, uint, 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
d342894c 81static unsigned int vxlan_net_id;
553675fb 82
83/* per UDP socket information */
84struct vxlan_sock {
85 struct hlist_node hlist;
86 struct rcu_head rcu;
87 struct work_struct del_work;
88 unsigned int refcnt;
89 struct socket *sock;
d342894c 90 struct hlist_head vni_list[VNI_HASH_SIZE];
91};
92
553675fb 93/* per-network namespace private data for this module */
94struct vxlan_net {
95 struct list_head vxlan_list;
96 struct hlist_head sock_list[PORT_HASH_SIZE];
97};
98
6681712d 99struct vxlan_rdst {
6681712d
DS		 100 __be32 remote_ip;
101 __be16 remote_port;
102 u32 remote_vni;
103 u32 remote_ifindex;
104 struct vxlan_rdst *remote_next;
105};
106
d342894c 107/* Forwarding table entry */
108struct vxlan_fdb {
109 struct hlist_node hlist; /* linked list of entries */
110 struct rcu_head rcu;
111 unsigned long updated; /* jiffies */
112 unsigned long used;
6681712d 113 struct vxlan_rdst remote;
d342894c 114 u16 state; /* see ndm_state */
ae884082 115 u8 flags; /* see ndm_flags */
d342894c 116 u8 eth_addr[ETH_ALEN];
117};
118
d342894c 119/* Pseudo network device */
120struct vxlan_dev {
553675fb 121 struct hlist_node hlist; /* vni hash table */
122 struct list_head next; /* vxlan's per namespace list */
123 struct vxlan_sock *vn_sock; /* listening socket */
d342894c 124 struct net_device *dev;
c7995c43 125 struct vxlan_rdst default_dst; /* default destination */
d342894c 126 __be32 saddr; /* source address */
823aa873 127 __be16 dst_port;
05f47d69 128 __u16 port_min; /* source port range */
129 __u16 port_max;
d342894c 130 __u8 tos; /* TOS override */
131 __u8 ttl;
e4f67add 132 u32 flags; /* VXLAN_F_* below */
d342894c 133
134 unsigned long age_interval;
135 struct timer_list age_timer;
136 spinlock_t hash_lock;
137 unsigned int addrcnt;
138 unsigned int addrmax;
d342894c 139
140 struct hlist_head fdb_head[FDB_HASH_SIZE];
141};
142
e4f67add
DS		 143#define VXLAN_F_LEARN 0x01
144#define VXLAN_F_PROXY 0x02
145#define VXLAN_F_RSC 0x04
146#define VXLAN_F_L2MISS 0x08
147#define VXLAN_F_L3MISS 0x10
148
d342894c 149/* salt for hash table */
150static u32 vxlan_salt __read_mostly;
151
553675fb 152/* Virtual Network hash table head */
153static inline struct hlist_head *vni_head(struct vxlan_sock *vs, u32 id)
154{
155 return &vs->vni_list[hash_32(id, VNI_HASH_BITS)];
156}
157
158/* Socket hash table head */
159static inline struct hlist_head *vs_head(struct net *net, __be16 port)
d342894c 160{
161 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
162
553675fb 163 return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
164}
165
166/* Find VXLAN socket based on network namespace and UDP port */
167static struct vxlan_sock *vxlan_find_port(struct net *net, __be16 port)
168{
169 struct vxlan_sock *vs;
170
171 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
172 if (inet_sk(vs->sock->sk)->inet_sport == port)
173 return vs;
174 }
175 return NULL;
d342894c 176}
177
178/* Look up VNI in a per net namespace table */
553675fb 179static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id, __be16 port)
d342894c 180{
553675fb 181 struct vxlan_sock *vs;
d342894c 182 struct vxlan_dev *vxlan;
d342894c 183
553675fb 184 vs = vxlan_find_port(net, port);
185 if (!vs)
186 return NULL;
187
188 hlist_for_each_entry_rcu(vxlan, vni_head(vs, id), hlist) {
c7995c43 189 if (vxlan->default_dst.remote_vni == id)
d342894c 190 return vxlan;
191 }
192
193 return NULL;
194}
195
196/* Fill in neighbour message in skbuff. */
197static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
198 const struct vxlan_fdb *fdb,
6681712d
DS		 199 u32 portid, u32 seq, int type, unsigned int flags,
200 const struct vxlan_rdst *rdst)
d342894c 201{
202 unsigned long now = jiffies;
203 struct nda_cacheinfo ci;
204 struct nlmsghdr *nlh;
205 struct ndmsg *ndm;
e4f67add 206 bool send_ip, send_eth;
d342894c 207
208 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
209 if (nlh == NULL)
210 return -EMSGSIZE;
211
212 ndm = nlmsg_data(nlh);
213 memset(ndm, 0, sizeof(*ndm));
e4f67add
DS		 214
215 send_eth = send_ip = true;
216
217 if (type == RTM_GETNEIGH) {
218 ndm->ndm_family = AF_INET;
6681712d 219 send_ip = rdst->remote_ip != htonl(INADDR_ANY);
e4f67add
DS		 220 send_eth = !is_zero_ether_addr(fdb->eth_addr);
221 } else
222 ndm->ndm_family = AF_BRIDGE;
d342894c 223 ndm->ndm_state = fdb->state;
224 ndm->ndm_ifindex = vxlan->dev->ifindex;
ae884082 225 ndm->ndm_flags = fdb->flags;
d342894c 226 ndm->ndm_type = NDA_DST;
227
e4f67add 228 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
d342894c 229 goto nla_put_failure;
230
6681712d
DS		 231 if (send_ip && nla_put_be32(skb, NDA_DST, rdst->remote_ip))
232 goto nla_put_failure;
233
823aa873 234 if (rdst->remote_port && rdst->remote_port != vxlan->dst_port &&
6681712d
DS		 235 nla_put_be16(skb, NDA_PORT, rdst->remote_port))
236 goto nla_put_failure;
c7995c43 237 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
6681712d
DS		 238 nla_put_be32(skb, NDA_VNI, rdst->remote_vni))
239 goto nla_put_failure;
240 if (rdst->remote_ifindex &&
241 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
d342894c 242 goto nla_put_failure;
243
244 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
245 ci.ndm_confirmed = 0;
246 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
247 ci.ndm_refcnt = 0;
248
249 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
250 goto nla_put_failure;
251
252 return nlmsg_end(skb, nlh);
253
254nla_put_failure:
255 nlmsg_cancel(skb, nlh);
256 return -EMSGSIZE;
257}
258
259static inline size_t vxlan_nlmsg_size(void)
260{
261 return NLMSG_ALIGN(sizeof(struct ndmsg))
262 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
263 + nla_total_size(sizeof(__be32)) /* NDA_DST */
73cf3317 264 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
6681712d
DS		 265 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
266 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
d342894c 267 + nla_total_size(sizeof(struct nda_cacheinfo));
268}
269
270static void vxlan_fdb_notify(struct vxlan_dev *vxlan,
271 const struct vxlan_fdb *fdb, int type)
272{
273 struct net *net = dev_net(vxlan->dev);
274 struct sk_buff *skb;
275 int err = -ENOBUFS;
276
277 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
278 if (skb == NULL)
279 goto errout;
280
6681712d 281 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, &fdb->remote);
d342894c 282 if (err < 0) {
283 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
284 WARN_ON(err == -EMSGSIZE);
285 kfree_skb(skb);
286 goto errout;
287 }
288
289 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
290 return;
291errout:
292 if (err < 0)
293 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
294}
295
e4f67add
DS		 296static void vxlan_ip_miss(struct net_device *dev, __be32 ipa)
297{
298 struct vxlan_dev *vxlan = netdev_priv(dev);
299 struct vxlan_fdb f;
300
301 memset(&f, 0, sizeof f);
302 f.state = NUD_STALE;
6681712d
DS		 303 f.remote.remote_ip = ipa; /* goes to NDA_DST */
304 f.remote.remote_vni = VXLAN_N_VID;
e4f67add
DS		 305
306 vxlan_fdb_notify(vxlan, &f, RTM_GETNEIGH);
307}
308
309static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
310{
311 struct vxlan_fdb f;
312
313 memset(&f, 0, sizeof f);
314 f.state = NUD_STALE;
315 memcpy(f.eth_addr, eth_addr, ETH_ALEN);
316
317 vxlan_fdb_notify(vxlan, &f, RTM_GETNEIGH);
318}
319
d342894c 320/* Hash Ethernet address */
321static u32 eth_hash(const unsigned char *addr)
322{
323 u64 value = get_unaligned((u64 *)addr);
324
325 /* only want 6 bytes */
326#ifdef __BIG_ENDIAN
d342894c 327 value >>= 16;
321fb991 328#else
329 value <<= 16;
d342894c 330#endif
331 return hash_64(value, FDB_HASH_BITS);
332}
333
334/* Hash chain to use given mac address */
335static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
336 const u8 *mac)
337{
338 return &vxlan->fdb_head[eth_hash(mac)];
339}
340
341/* Look up Ethernet address in forwarding table */
014be2c8 342static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
d342894c 343 const u8 *mac)
344
345{
346 struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
347 struct vxlan_fdb *f;
d342894c 348
b67bfe0d 349 hlist_for_each_entry_rcu(f, head, hlist) {
d342894c 350 if (compare_ether_addr(mac, f->eth_addr) == 0)
351 return f;
352 }
353
354 return NULL;
355}
356
014be2c8
SS		 357static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
358 const u8 *mac)
359{
360 struct vxlan_fdb *f;
361
362 f = __vxlan_find_mac(vxlan, mac);
363 if (f)
364 f->used = jiffies;
365
366 return f;
367}
368
6681712d
DS		 369/* Add/update destinations for multicast */
370static int vxlan_fdb_append(struct vxlan_fdb *f,
73cf3317 371 __be32 ip, __be16 port, __u32 vni, __u32 ifindex)
6681712d
DS		 372{
373 struct vxlan_rdst *rd_prev, *rd;
374
375 rd_prev = NULL;
376 for (rd = &f->remote; rd; rd = rd->remote_next) {
377 if (rd->remote_ip == ip &&
378 rd->remote_port == port &&
379 rd->remote_vni == vni &&
380 rd->remote_ifindex == ifindex)
381 return 0;
382 rd_prev = rd;
383 }
384 rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
385 if (rd == NULL)
386 return -ENOBUFS;
387 rd->remote_ip = ip;
388 rd->remote_port = port;
389 rd->remote_vni = vni;
390 rd->remote_ifindex = ifindex;
391 rd->remote_next = NULL;
392 rd_prev->remote_next = rd;
393 return 1;
394}
395
d342894c 396/* Add new entry to forwarding table -- assumes lock held */
397static int vxlan_fdb_create(struct vxlan_dev *vxlan,
398 const u8 *mac, __be32 ip,
6681712d 399 __u16 state, __u16 flags,
73cf3317 400 __be16 port, __u32 vni, __u32 ifindex,
ae884082 401 __u8 ndm_flags)
d342894c 402{
403 struct vxlan_fdb *f;
404 int notify = 0;
405
014be2c8 406 f = __vxlan_find_mac(vxlan, mac);
d342894c 407 if (f) {
408 if (flags & NLM_F_EXCL) {
409 netdev_dbg(vxlan->dev,
410 "lost race to create %pM\n", mac);
411 return -EEXIST;
412 }
413 if (f->state != state) {
414 f->state = state;
415 f->updated = jiffies;
416 notify = 1;
417 }
ae884082
DS		 418 if (f->flags != ndm_flags) {
419 f->flags = ndm_flags;
420 f->updated = jiffies;
421 notify = 1;
422 }
6681712d
DS		 423 if ((flags & NLM_F_APPEND) &&
424 is_multicast_ether_addr(f->eth_addr)) {
425 int rc = vxlan_fdb_append(f, ip, port, vni, ifindex);
426
427 if (rc < 0)
428 return rc;
429 notify |= rc;
430 }
d342894c 431 } else {
432 if (!(flags & NLM_F_CREATE))
433 return -ENOENT;
434
435 if (vxlan->addrmax && vxlan->addrcnt >= vxlan->addrmax)
436 return -ENOSPC;
437
438 netdev_dbg(vxlan->dev, "add %pM -> %pI4\n", mac, &ip);
439 f = kmalloc(sizeof(*f), GFP_ATOMIC);
440 if (!f)
441 return -ENOMEM;
442
443 notify = 1;
6681712d
DS		 444 f->remote.remote_ip = ip;
445 f->remote.remote_port = port;
446 f->remote.remote_vni = vni;
447 f->remote.remote_ifindex = ifindex;
448 f->remote.remote_next = NULL;
d342894c 449 f->state = state;
ae884082 450 f->flags = ndm_flags;
d342894c 451 f->updated = f->used = jiffies;
452 memcpy(f->eth_addr, mac, ETH_ALEN);
453
454 ++vxlan->addrcnt;
455 hlist_add_head_rcu(&f->hlist,
456 vxlan_fdb_head(vxlan, mac));
457 }
458
459 if (notify)
460 vxlan_fdb_notify(vxlan, f, RTM_NEWNEIGH);
461
462 return 0;
463}
464
6706c82e 465static void vxlan_fdb_free(struct rcu_head *head)
6681712d
DS		 466{
467 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
468
469 while (f->remote.remote_next) {
470 struct vxlan_rdst *rd = f->remote.remote_next;
471
472 f->remote.remote_next = rd->remote_next;
473 kfree(rd);
474 }
475 kfree(f);
476}
477
d342894c 478static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
479{
480 netdev_dbg(vxlan->dev,
481 "delete %pM\n", f->eth_addr);
482
483 --vxlan->addrcnt;
484 vxlan_fdb_notify(vxlan, f, RTM_DELNEIGH);
485
486 hlist_del_rcu(&f->hlist);
6681712d 487 call_rcu(&f->rcu, vxlan_fdb_free);
d342894c 488}
489
490/* Add static entry (via netlink) */
491static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
492 struct net_device *dev,
493 const unsigned char *addr, u16 flags)
494{
495 struct vxlan_dev *vxlan = netdev_priv(dev);
6681712d 496 struct net *net = dev_net(vxlan->dev);
d342894c 497 __be32 ip;
73cf3317 498 __be16 port;
499 u32 vni, ifindex;
d342894c 500 int err;
501
502 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
503 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
504 ndm->ndm_state);
505 return -EINVAL;
506 }
507
508 if (tb[NDA_DST] == NULL)
509 return -EINVAL;
510
511 if (nla_len(tb[NDA_DST]) != sizeof(__be32))
512 return -EAFNOSUPPORT;
513
514 ip = nla_get_be32(tb[NDA_DST]);
515
6681712d 516 if (tb[NDA_PORT]) {
73cf3317 517 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
6681712d 518 return -EINVAL;
73cf3317 519 port = nla_get_be16(tb[NDA_PORT]);
6681712d 520 } else
823aa873 521 port = vxlan->dst_port;
6681712d
DS		 522
523 if (tb[NDA_VNI]) {
524 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
525 return -EINVAL;
526 vni = nla_get_u32(tb[NDA_VNI]);
527 } else
c7995c43 528 vni = vxlan->default_dst.remote_vni;
6681712d
DS		 529
530 if (tb[NDA_IFINDEX]) {
5abb0029 531 struct net_device *tdev;
6681712d
DS		 532
533 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
534 return -EINVAL;
535 ifindex = nla_get_u32(tb[NDA_IFINDEX]);
5abb0029
PS		 536 tdev = dev_get_by_index(net, ifindex);
537 if (!tdev)
6681712d 538 return -EADDRNOTAVAIL;
5abb0029 539 dev_put(tdev);
6681712d
DS		 540 } else
541 ifindex = 0;
542
d342894c 543 spin_lock_bh(&vxlan->hash_lock);
73cf3317 544 err = vxlan_fdb_create(vxlan, addr, ip, ndm->ndm_state, flags,
545 port, vni, ifindex, ndm->ndm_flags);
d342894c 546 spin_unlock_bh(&vxlan->hash_lock);
547
548 return err;
549}
550
551/* Delete entry (via netlink) */
1690be63
VY		 552static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
553 struct net_device *dev,
d342894c 554 const unsigned char *addr)
555{
556 struct vxlan_dev *vxlan = netdev_priv(dev);
557 struct vxlan_fdb *f;
558 int err = -ENOENT;
559
560 spin_lock_bh(&vxlan->hash_lock);
561 f = vxlan_find_mac(vxlan, addr);
562 if (f) {
563 vxlan_fdb_destroy(vxlan, f);
564 err = 0;
565 }
566 spin_unlock_bh(&vxlan->hash_lock);
567
568 return err;
569}
570
571/* Dump forwarding table */
572static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
573 struct net_device *dev, int idx)
574{
575 struct vxlan_dev *vxlan = netdev_priv(dev);
576 unsigned int h;
577
578 for (h = 0; h < FDB_HASH_SIZE; ++h) {
579 struct vxlan_fdb *f;
d342894c 580 int err;
581
b67bfe0d 582 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
6681712d
DS		 583 struct vxlan_rdst *rd;
584 for (rd = &f->remote; rd; rd = rd->remote_next) {
585 if (idx < cb->args[0])
586 goto skip;
587
588 err = vxlan_fdb_info(skb, vxlan, f,
589 NETLINK_CB(cb->skb).portid,
590 cb->nlh->nlmsg_seq,
591 RTM_NEWNEIGH,
592 NLM_F_MULTI, rd);
593 if (err < 0)
594 break;
d342894c 595skip:
6681712d
DS		 596 ++idx;
597 }
d342894c 598 }
599 }
600
601 return idx;
602}
603
604/* Watch incoming packets to learn mapping between Ethernet address
605 * and Tunnel endpoint.
26a41ae6 606 * Return true if packet is bogus and should be droppped.
d342894c 607 */
26a41ae6 608static bool vxlan_snoop(struct net_device *dev,
d342894c 609 __be32 src_ip, const u8 *src_mac)
610{
611 struct vxlan_dev *vxlan = netdev_priv(dev);
612 struct vxlan_fdb *f;
d342894c 613
614 f = vxlan_find_mac(vxlan, src_mac);
615 if (likely(f)) {
6681712d 616 if (likely(f->remote.remote_ip == src_ip))
26a41ae6 617 return false;
618
619 /* Don't migrate static entries, drop packets */
eb064c3b 620 if (f->state & NUD_NOARP)
26a41ae6 621 return true;
d342894c 622
623 if (net_ratelimit())
624 netdev_info(dev,
625 "%pM migrated from %pI4 to %pI4\n",
6681712d 626 src_mac, &f->remote.remote_ip, &src_ip);
d342894c 627
6681712d 628 f->remote.remote_ip = src_ip;
d342894c 629 f->updated = jiffies;
630 } else {
631 /* learned new entry */
632 spin_lock(&vxlan->hash_lock);
3bf74b1a 633
634 /* close off race between vxlan_flush and incoming packets */
635 if (netif_running(dev))
636 vxlan_fdb_create(vxlan, src_mac, src_ip,
637 NUD_REACHABLE,
638 NLM_F_EXCL|NLM_F_CREATE,
639 vxlan->dst_port,
640 vxlan->default_dst.remote_vni,
641 0, NTF_SELF);
d342894c 642 spin_unlock(&vxlan->hash_lock);
643 }
26a41ae6 644
645 return false;
d342894c 646}
647
648
649/* See if multicast group is already in use by other ID */
650static bool vxlan_group_used(struct vxlan_net *vn,
651 const struct vxlan_dev *this)
652{
553675fb 653 struct vxlan_dev *vxlan;
d342894c 654
553675fb 655 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
656 if (vxlan == this)
657 continue;
d342894c 658
553675fb 659 if (!netif_running(vxlan->dev))
660 continue;
d342894c 661
553675fb 662 if (vxlan->default_dst.remote_ip == this->default_dst.remote_ip)
663 return true;
664 }
d342894c 665
666 return false;
667}
668
669/* kernel equivalent to IP_ADD_MEMBERSHIP */
670static int vxlan_join_group(struct net_device *dev)
671{
672 struct vxlan_dev *vxlan = netdev_priv(dev);
673 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
553675fb 674 struct sock *sk = vxlan->vn_sock->sock->sk;
d342894c 675 struct ip_mreqn mreq = {
c7995c43
AW		 676 .imr_multiaddr.s_addr = vxlan->default_dst.remote_ip,
677 .imr_ifindex = vxlan->default_dst.remote_ifindex,
d342894c 678 };
679 int err;
680
681 /* Already a member of group */
682 if (vxlan_group_used(vn, vxlan))
683 return 0;
684
685 /* Need to drop RTNL to call multicast join */
686 rtnl_unlock();
687 lock_sock(sk);
688 err = ip_mc_join_group(sk, &mreq);
689 release_sock(sk);
690 rtnl_lock();
691
692 return err;
693}
694
695
696/* kernel equivalent to IP_DROP_MEMBERSHIP */
697static int vxlan_leave_group(struct net_device *dev)
698{
699 struct vxlan_dev *vxlan = netdev_priv(dev);
700 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
701 int err = 0;
553675fb 702 struct sock *sk = vxlan->vn_sock->sock->sk;
d342894c 703 struct ip_mreqn mreq = {
c7995c43
AW		 704 .imr_multiaddr.s_addr = vxlan->default_dst.remote_ip,
705 .imr_ifindex = vxlan->default_dst.remote_ifindex,
d342894c 706 };
707
708 /* Only leave group when last vxlan is done. */
709 if (vxlan_group_used(vn, vxlan))
710 return 0;
711
712 /* Need to drop RTNL to call multicast leave */
713 rtnl_unlock();
714 lock_sock(sk);
715 err = ip_mc_leave_group(sk, &mreq);
716 release_sock(sk);
717 rtnl_lock();
718
719 return err;
720}
721
722/* Callback from net/ipv4/udp.c to receive packets */
723static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
724{
725 struct iphdr *oip;
726 struct vxlanhdr *vxh;
727 struct vxlan_dev *vxlan;
e8171045 728 struct pcpu_tstats *stats;
553675fb 729 __be16 port;
d342894c 730 __u32 vni;
731 int err;
732
733 /* pop off outer UDP header */
734 __skb_pull(skb, sizeof(struct udphdr));
735
736 /* Need Vxlan and inner Ethernet header to be present */
737 if (!pskb_may_pull(skb, sizeof(struct vxlanhdr)))
738 goto error;
739
740 /* Drop packets with reserved bits set */
741 vxh = (struct vxlanhdr *) skb->data;
742 if (vxh->vx_flags != htonl(VXLAN_FLAGS) ||
743 (vxh->vx_vni & htonl(0xff))) {
744 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
745 ntohl(vxh->vx_flags), ntohl(vxh->vx_vni));
746 goto error;
747 }
748
749 __skb_pull(skb, sizeof(struct vxlanhdr));
d342894c 750
751 /* Is this VNI defined? */
752 vni = ntohl(vxh->vx_vni) >> 8;
553675fb 753 port = inet_sk(sk)->inet_sport;
754 vxlan = vxlan_find_vni(sock_net(sk), vni, port);
d342894c 755 if (!vxlan) {
553675fb 756 netdev_dbg(skb->dev, "unknown vni %d port %u\n",
757 vni, ntohs(port));
d342894c 758 goto drop;
759 }
760
761 if (!pskb_may_pull(skb, ETH_HLEN)) {
762 vxlan->dev->stats.rx_length_errors++;
763 vxlan->dev->stats.rx_errors++;
764 goto drop;
765 }
766
e4f67add
DS		 767 skb_reset_mac_header(skb);
768
d342894c 769 /* Re-examine inner Ethernet packet */
770 oip = ip_hdr(skb);
771 skb->protocol = eth_type_trans(skb, vxlan->dev);
d342894c 772
773 /* Ignore packet loops (and multicast echo) */
774 if (compare_ether_addr(eth_hdr(skb)->h_source,
775 vxlan->dev->dev_addr) == 0)
776 goto drop;
777
26a41ae6 778 if ((vxlan->flags & VXLAN_F_LEARN) &&
779 vxlan_snoop(skb->dev, oip->saddr, eth_hdr(skb)->h_source))
780 goto drop;
d342894c 781
782 __skb_tunnel_rx(skb, vxlan->dev);
783 skb_reset_network_header(skb);
0afb1666
JG		 784
785 /* If the NIC driver gave us an encapsulated packet with
786 * CHECKSUM_UNNECESSARY and Rx checksum feature is enabled,
787 * leave the CHECKSUM_UNNECESSARY, the device checksummed it
788 * for us. Otherwise force the upper layers to verify it.
789 */
790 if (skb->ip_summed != CHECKSUM_UNNECESSARY || !skb->encapsulation ||
791 !(vxlan->dev->features & NETIF_F_RXCSUM))
792 skb->ip_summed = CHECKSUM_NONE;
793
794 skb->encapsulation = 0;
d342894c 795
796 err = IP_ECN_decapsulate(oip, skb);
797 if (unlikely(err)) {
798 if (log_ecn_error)
799 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
800 &oip->saddr, oip->tos);
801 if (err > 1) {
802 ++vxlan->dev->stats.rx_frame_errors;
803 ++vxlan->dev->stats.rx_errors;
804 goto drop;
805 }
806 }
807
e8171045 808 stats = this_cpu_ptr(vxlan->dev->tstats);
d342894c 809 u64_stats_update_begin(&stats->syncp);
810 stats->rx_packets++;
811 stats->rx_bytes += skb->len;
812 u64_stats_update_end(&stats->syncp);
813
814 netif_rx(skb);
815
816 return 0;
817error:
818 /* Put UDP header back */
819 __skb_push(skb, sizeof(struct udphdr));
820
821 return 1;
822drop:
823 /* Consume bad packet */
824 kfree_skb(skb);
825 return 0;
826}
827
e4f67add
DS		 828static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
829{
830 struct vxlan_dev *vxlan = netdev_priv(dev);
831 struct arphdr *parp;
832 u8 *arpptr, *sha;
833 __be32 sip, tip;
834 struct neighbour *n;
835
836 if (dev->flags & IFF_NOARP)
837 goto out;
838
839 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
840 dev->stats.tx_dropped++;
841 goto out;
842 }
843 parp = arp_hdr(skb);
844
845 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
846 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
847 parp->ar_pro != htons(ETH_P_IP) ||
848 parp->ar_op != htons(ARPOP_REQUEST) ||
849 parp->ar_hln != dev->addr_len ||
850 parp->ar_pln != 4)
851 goto out;
852 arpptr = (u8 *)parp + sizeof(struct arphdr);
853 sha = arpptr;
854 arpptr += dev->addr_len; /* sha */
855 memcpy(&sip, arpptr, sizeof(sip));
856 arpptr += sizeof(sip);
857 arpptr += dev->addr_len; /* tha */
858 memcpy(&tip, arpptr, sizeof(tip));
859
860 if (ipv4_is_loopback(tip) ||
861 ipv4_is_multicast(tip))
862 goto out;
863
864 n = neigh_lookup(&arp_tbl, &tip, dev);
865
866 if (n) {
e4f67add
DS		 867 struct vxlan_fdb *f;
868 struct sk_buff *reply;
869
870 if (!(n->nud_state & NUD_CONNECTED)) {
871 neigh_release(n);
872 goto out;
873 }
874
875 f = vxlan_find_mac(vxlan, n->ha);
6681712d 876 if (f && f->remote.remote_ip == htonl(INADDR_ANY)) {
e4f67add
DS		 877 /* bridge-local neighbor */
878 neigh_release(n);
879 goto out;
880 }
881
882 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
883 n->ha, sha);
884
885 neigh_release(n);
886
887 skb_reset_mac_header(reply);
888 __skb_pull(reply, skb_network_offset(reply));
889 reply->ip_summed = CHECKSUM_UNNECESSARY;
890 reply->pkt_type = PACKET_HOST;
891
892 if (netif_rx_ni(reply) == NET_RX_DROP)
893 dev->stats.rx_dropped++;
894 } else if (vxlan->flags & VXLAN_F_L3MISS)
895 vxlan_ip_miss(dev, tip);
896out:
897 consume_skb(skb);
898 return NETDEV_TX_OK;
899}
900
901static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
902{
903 struct vxlan_dev *vxlan = netdev_priv(dev);
904 struct neighbour *n;
905 struct iphdr *pip;
906
907 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
908 return false;
909
910 n = NULL;
911 switch (ntohs(eth_hdr(skb)->h_proto)) {
912 case ETH_P_IP:
913 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
914 return false;
915 pip = ip_hdr(skb);
916 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
917 break;
918 default:
919 return false;
920 }
921
922 if (n) {
923 bool diff;
924
925 diff = compare_ether_addr(eth_hdr(skb)->h_dest, n->ha) != 0;
926 if (diff) {
927 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
928 dev->addr_len);
929 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
930 }
931 neigh_release(n);
932 return diff;
933 } else if (vxlan->flags & VXLAN_F_L3MISS)
934 vxlan_ip_miss(dev, pip->daddr);
935 return false;
936}
937
553675fb 938static void vxlan_sock_put(struct sk_buff *skb)
1cad8715 939{
940 sock_put(skb->sk);
941}
942
943/* On transmit, associate with the tunnel socket */
944static void vxlan_set_owner(struct net_device *dev, struct sk_buff *skb)
945{
553675fb 946 struct vxlan_dev *vxlan = netdev_priv(dev);
947 struct sock *sk = vxlan->vn_sock->sock->sk;
1cad8715 948
949 skb_orphan(skb);
950 sock_hold(sk);
951 skb->sk = sk;
553675fb 952 skb->destructor = vxlan_sock_put;
1cad8715 953}
954
05f47d69 955/* Compute source port for outgoing packet
956 * first choice to use L4 flow hash since it will spread
957 * better and maybe available from hardware
958 * secondary choice is to use jhash on the Ethernet header
959 */
7d836a76 960static __be16 vxlan_src_port(const struct vxlan_dev *vxlan, struct sk_buff *skb)
05f47d69 961{
962 unsigned int range = (vxlan->port_max - vxlan->port_min) + 1;
963 u32 hash;
964
965 hash = skb_get_rxhash(skb);
966 if (!hash)
967 hash = jhash(skb->data, 2 * ETH_ALEN,
968 (__force u32) skb->protocol);
969
7d836a76 970 return htons((((u64) hash * range) >> 32) + vxlan->port_min);
05f47d69 971}
972
05c0db08
PS		 973static int handle_offloads(struct sk_buff *skb)
974{
975 if (skb_is_gso(skb)) {
976 int err = skb_unclone(skb, GFP_ATOMIC);
977 if (unlikely(err))
978 return err;
979
f6ace502 980 skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_TUNNEL;
05c0db08
PS		 981 } else if (skb->ip_summed != CHECKSUM_PARTIAL)
982 skb->ip_summed = CHECKSUM_NONE;
983
984 return 0;
985}
986
9dcc71e1
SS		 987/* Bypass encapsulation if the destination is local */
988static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
989 struct vxlan_dev *dst_vxlan)
990{
991 struct pcpu_tstats *tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
992 struct pcpu_tstats *rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
993
994 skb->pkt_type = PACKET_HOST;
995 skb->encapsulation = 0;
996 skb->dev = dst_vxlan->dev;
997 __skb_pull(skb, skb_network_offset(skb));
998
999 if (dst_vxlan->flags & VXLAN_F_LEARN)
9d9f163c
MR		 1000 vxlan_snoop(skb->dev, htonl(INADDR_LOOPBACK),
1001 eth_hdr(skb)->h_source);
9dcc71e1
SS		 1002
1003 u64_stats_update_begin(&tx_stats->syncp);
1004 tx_stats->tx_packets++;
1005 tx_stats->tx_bytes += skb->len;
1006 u64_stats_update_end(&tx_stats->syncp);
1007
1008 if (netif_rx(skb) == NET_RX_SUCCESS) {
1009 u64_stats_update_begin(&rx_stats->syncp);
1010 rx_stats->rx_packets++;
1011 rx_stats->rx_bytes += skb->len;
1012 u64_stats_update_end(&rx_stats->syncp);
1013 } else {
1014 skb->dev->stats.rx_dropped++;
1015 }
1016}
1017
6681712d
DS		 1018static netdev_tx_t vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1019 struct vxlan_rdst *rdst, bool did_rsc)
d342894c 1020{
1021 struct vxlan_dev *vxlan = netdev_priv(dev);
1022 struct rtable *rt;
d342894c 1023 const struct iphdr *old_iph;
d342894c 1024 struct vxlanhdr *vxh;
1025 struct udphdr *uh;
1026 struct flowi4 fl4;
d342894c 1027 __be32 dst;
7d836a76 1028 __be16 src_port, dst_port;
6681712d 1029 u32 vni;
d342894c 1030 __be16 df = 0;
1031 __u8 tos, ttl;
0e6fbc5b 1032 int err;
d342894c 1033
823aa873 1034 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->dst_port;
6681712d
DS		 1035 vni = rdst->remote_vni;
1036 dst = rdst->remote_ip;
e4f67add
DS		 1037
1038 if (!dst) {
1039 if (did_rsc) {
e4f67add 1040 /* short-circuited back to local bridge */
9dcc71e1 1041 vxlan_encap_bypass(skb, vxlan, vxlan);
e4f67add
DS		 1042 return NETDEV_TX_OK;
1043 }
ef59febe 1044 goto drop;
e4f67add 1045 }
ef59febe 1046
d6727fe3
JG		 1047 if (!skb->encapsulation) {
1048 skb_reset_inner_headers(skb);
1049 skb->encapsulation = 1;
1050 }
1051
d342894c 1052 /* Need space for new headers (invalidates iph ptr) */
1053 if (skb_cow_head(skb, VXLAN_HEADROOM))
1054 goto drop;
1055
d342894c 1056 old_iph = ip_hdr(skb);
1057
d342894c 1058 ttl = vxlan->ttl;
1059 if (!ttl && IN_MULTICAST(ntohl(dst)))
1060 ttl = 1;
1061
1062 tos = vxlan->tos;
1063 if (tos == 1)
206aaafc 1064 tos = ip_tunnel_get_dsfield(old_iph, skb);
d342894c 1065
05f47d69 1066 src_port = vxlan_src_port(vxlan, skb);
d342894c 1067
ca78f181 1068 memset(&fl4, 0, sizeof(fl4));
6681712d 1069 fl4.flowi4_oif = rdst->remote_ifindex;
ca78f181 1070 fl4.flowi4_tos = RT_TOS(tos);
1071 fl4.daddr = dst;
1072 fl4.saddr = vxlan->saddr;
1073
1074 rt = ip_route_output_key(dev_net(dev), &fl4);
d342894c 1075 if (IS_ERR(rt)) {
1076 netdev_dbg(dev, "no route to %pI4\n", &dst);
1077 dev->stats.tx_carrier_errors++;
1078 goto tx_error;
1079 }
1080
1081 if (rt->dst.dev == dev) {
1082 netdev_dbg(dev, "circular route to %pI4\n", &dst);
1083 ip_rt_put(rt);
1084 dev->stats.collisions++;
1085 goto tx_error;
1086 }
1087
9dcc71e1 1088 /* Bypass encapsulation if the destination is local */
ab09a6d0
MR		 1089 if (rt->rt_flags & RTCF_LOCAL &&
1090 !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
9dcc71e1
SS		 1091 struct vxlan_dev *dst_vxlan;
1092
1093 ip_rt_put(rt);
553675fb 1094 dst_vxlan = vxlan_find_vni(dev_net(dev), vni, dst_port);
9dcc71e1
SS		 1095 if (!dst_vxlan)
1096 goto tx_error;
1097 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1098 return NETDEV_TX_OK;
1099 }
d342894c 1100 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1101 vxh->vx_flags = htonl(VXLAN_FLAGS);
6681712d 1102 vxh->vx_vni = htonl(vni << 8);
d342894c 1103
1104 __skb_push(skb, sizeof(*uh));
1105 skb_reset_transport_header(skb);
1106 uh = udp_hdr(skb);
1107
73cf3317 1108 uh->dest = dst_port;
7d836a76 1109 uh->source = src_port;
d342894c 1110
1111 uh->len = htons(skb->len);
1112 uh->check = 0;
1113
1cad8715 1114 vxlan_set_owner(dev, skb);
1115
05c0db08
PS		 1116 if (handle_offloads(skb))
1117 goto drop;
d342894c 1118
0e6fbc5b
PS		 1119 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
1120 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
1121
1122 err = iptunnel_xmit(dev_net(dev), rt, skb, fl4.saddr, dst,
1123 IPPROTO_UDP, tos, ttl, df);
1124 iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
1125
d342894c 1126 return NETDEV_TX_OK;
1127
1128drop:
1129 dev->stats.tx_dropped++;
1130 goto tx_free;
1131
1132tx_error:
1133 dev->stats.tx_errors++;
1134tx_free:
1135 dev_kfree_skb(skb);
1136 return NETDEV_TX_OK;
1137}
1138
6681712d
DS		 1139/* Transmit local packets over Vxlan
1140 *
1141 * Outer IP header inherits ECN and DF from inner header.
1142 * Outer UDP destination is the VXLAN assigned port.
1143 * source port is based on hash of flow
1144 */
1145static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
1146{
1147 struct vxlan_dev *vxlan = netdev_priv(dev);
1148 struct ethhdr *eth;
1149 bool did_rsc = false;
c7995c43 1150 struct vxlan_rdst *rdst0, *rdst;
6681712d
DS		 1151 struct vxlan_fdb *f;
1152 int rc1, rc;
1153
1154 skb_reset_mac_header(skb);
1155 eth = eth_hdr(skb);
1156
1157 if ((vxlan->flags & VXLAN_F_PROXY) && ntohs(eth->h_proto) == ETH_P_ARP)
1158 return arp_reduce(dev, skb);
6681712d
DS		 1159
1160 f = vxlan_find_mac(vxlan, eth->h_dest);
ae884082
DS		 1161 did_rsc = false;
1162
1163 if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
1164 ntohs(eth->h_proto) == ETH_P_IP) {
1165 did_rsc = route_shortcircuit(dev, skb);
1166 if (did_rsc)
1167 f = vxlan_find_mac(vxlan, eth->h_dest);
1168 }
1169
6681712d 1170 if (f == NULL) {
c7995c43
AW		 1171 rdst0 = &vxlan->default_dst;
1172
1173 if (rdst0->remote_ip == htonl(INADDR_ANY) &&
6681712d
DS		 1174 (vxlan->flags & VXLAN_F_L2MISS) &&
1175 !is_multicast_ether_addr(eth->h_dest))
1176 vxlan_fdb_miss(vxlan, eth->h_dest);
1177 } else
1178 rdst0 = &f->remote;
1179
1180 rc = NETDEV_TX_OK;
1181
1182 /* if there are multiple destinations, send copies */
1183 for (rdst = rdst0->remote_next; rdst; rdst = rdst->remote_next) {
1184 struct sk_buff *skb1;
1185
1186 skb1 = skb_clone(skb, GFP_ATOMIC);
7aa27238 1187 if (skb1) {
1188 rc1 = vxlan_xmit_one(skb1, dev, rdst, did_rsc);
1189 if (rc == NETDEV_TX_OK)
1190 rc = rc1;
1191 }
6681712d
DS		 1192 }
1193
1194 rc1 = vxlan_xmit_one(skb, dev, rdst0, did_rsc);
1195 if (rc == NETDEV_TX_OK)
1196 rc = rc1;
1197 return rc;
1198}
1199
d342894c 1200/* Walk the forwarding table and purge stale entries */
1201static void vxlan_cleanup(unsigned long arg)
1202{
1203 struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
1204 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
1205 unsigned int h;
1206
1207 if (!netif_running(vxlan->dev))
1208 return;
1209
1210 spin_lock_bh(&vxlan->hash_lock);
1211 for (h = 0; h < FDB_HASH_SIZE; ++h) {
1212 struct hlist_node *p, *n;
1213 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
1214 struct vxlan_fdb *f
1215 = container_of(p, struct vxlan_fdb, hlist);
1216 unsigned long timeout;
1217
3c172868 1218 if (f->state & NUD_PERMANENT)
d342894c 1219 continue;
1220
1221 timeout = f->used + vxlan->age_interval * HZ;
1222 if (time_before_eq(timeout, jiffies)) {
1223 netdev_dbg(vxlan->dev,
1224 "garbage collect %pM\n",
1225 f->eth_addr);
1226 f->state = NUD_STALE;
1227 vxlan_fdb_destroy(vxlan, f);
1228 } else if (time_before(timeout, next_timer))
1229 next_timer = timeout;
1230 }
1231 }
1232 spin_unlock_bh(&vxlan->hash_lock);
1233
1234 mod_timer(&vxlan->age_timer, next_timer);
1235}
1236
1237/* Setup stats when device is created */
1238static int vxlan_init(struct net_device *dev)
1239{
e8171045
PS		 1240 dev->tstats = alloc_percpu(struct pcpu_tstats);
1241 if (!dev->tstats)
d342894c 1242 return -ENOMEM;
1243
1244 return 0;
1245}
1246
1247/* Start ageing timer and join group when device is brought up */
1248static int vxlan_open(struct net_device *dev)
1249{
1250 struct vxlan_dev *vxlan = netdev_priv(dev);
1251 int err;
1252
c7995c43 1253 if (IN_MULTICAST(ntohl(vxlan->default_dst.remote_ip))) {
d342894c 1254 err = vxlan_join_group(dev);
1255 if (err)
1256 return err;
1257 }
1258
1259 if (vxlan->age_interval)
1260 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
1261
1262 return 0;
1263}
1264
1265/* Purge the forwarding table */
1266static void vxlan_flush(struct vxlan_dev *vxlan)
1267{
31fec5aa 1268 unsigned int h;
d342894c 1269
1270 spin_lock_bh(&vxlan->hash_lock);
1271 for (h = 0; h < FDB_HASH_SIZE; ++h) {
1272 struct hlist_node *p, *n;
1273 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
1274 struct vxlan_fdb *f
1275 = container_of(p, struct vxlan_fdb, hlist);
1276 vxlan_fdb_destroy(vxlan, f);
1277 }
1278 }
1279 spin_unlock_bh(&vxlan->hash_lock);
1280}
1281
1282/* Cleanup timer and forwarding table on shutdown */
1283static int vxlan_stop(struct net_device *dev)
1284{
1285 struct vxlan_dev *vxlan = netdev_priv(dev);
1286
c7995c43 1287 if (IN_MULTICAST(ntohl(vxlan->default_dst.remote_ip)))
d342894c 1288 vxlan_leave_group(dev);
1289
1290 del_timer_sync(&vxlan->age_timer);
1291
1292 vxlan_flush(vxlan);
1293
1294 return 0;
1295}
1296
d342894c 1297/* Stub, nothing needs to be done. */
1298static void vxlan_set_multicast_list(struct net_device *dev)
1299{
1300}
1301
1302static const struct net_device_ops vxlan_netdev_ops = {
1303 .ndo_init = vxlan_init,
1304 .ndo_open = vxlan_open,
1305 .ndo_stop = vxlan_stop,
1306 .ndo_start_xmit = vxlan_xmit,
e8171045 1307 .ndo_get_stats64 = ip_tunnel_get_stats64,
d342894c 1308 .ndo_set_rx_mode = vxlan_set_multicast_list,
1309 .ndo_change_mtu = eth_change_mtu,
1310 .ndo_validate_addr = eth_validate_addr,
1311 .ndo_set_mac_address = eth_mac_addr,
1312 .ndo_fdb_add = vxlan_fdb_add,
1313 .ndo_fdb_del = vxlan_fdb_delete,
1314 .ndo_fdb_dump = vxlan_fdb_dump,
1315};
1316
1317/* Info for udev, that this is a virtual tunnel endpoint */
1318static struct device_type vxlan_type = {
1319 .name = "vxlan",
1320};
1321
1322static void vxlan_free(struct net_device *dev)
1323{
e8171045 1324 free_percpu(dev->tstats);
d342894c 1325 free_netdev(dev);
1326}
1327
1328/* Initialize the device structure. */
1329static void vxlan_setup(struct net_device *dev)
1330{
1331 struct vxlan_dev *vxlan = netdev_priv(dev);
31fec5aa 1332 unsigned int h;
05f47d69 1333 int low, high;
d342894c 1334
1335 eth_hw_addr_random(dev);
1336 ether_setup(dev);
2840bf22 1337 dev->hard_header_len = ETH_HLEN + VXLAN_HEADROOM;
d342894c 1338
1339 dev->netdev_ops = &vxlan_netdev_ops;
1340 dev->destructor = vxlan_free;
1341 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
1342
1343 dev->tx_queue_len = 0;
1344 dev->features |= NETIF_F_LLTX;
1345 dev->features |= NETIF_F_NETNS_LOCAL;
d6727fe3 1346 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
0afb1666 1347 dev->features |= NETIF_F_RXCSUM;
05c0db08 1348 dev->features |= NETIF_F_GSO_SOFTWARE;
0afb1666
JG		 1349
1350 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
05c0db08 1351 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
d342894c 1352 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
6602d007 1353 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
d342894c 1354
553675fb 1355 INIT_LIST_HEAD(&vxlan->next);
d342894c 1356 spin_lock_init(&vxlan->hash_lock);
1357
1358 init_timer_deferrable(&vxlan->age_timer);
1359 vxlan->age_timer.function = vxlan_cleanup;
1360 vxlan->age_timer.data = (unsigned long) vxlan;
1361
05f47d69 1362 inet_get_local_port_range(&low, &high);
1363 vxlan->port_min = low;
1364 vxlan->port_max = high;
823aa873 1365 vxlan->dst_port = htons(vxlan_port);
05f47d69 1366
d342894c 1367 vxlan->dev = dev;
1368
1369 for (h = 0; h < FDB_HASH_SIZE; ++h)
1370 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
1371}
1372
1373static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
1374 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
5d174dd8 1375 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
d342894c 1376 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
1377 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
1378 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
1379 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
1380 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
1381 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
1382 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
05f47d69 1383 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
e4f67add
DS		 1384 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
1385 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
1386 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
1387 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
823aa873 1388 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
d342894c 1389};
1390
1391static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
1392{
1393 if (tb[IFLA_ADDRESS]) {
1394 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
1395 pr_debug("invalid link address (not ethernet)\n");
1396 return -EINVAL;
1397 }
1398
1399 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
1400 pr_debug("invalid all zero ethernet address\n");
1401 return -EADDRNOTAVAIL;
1402 }
1403 }
1404
1405 if (!data)
1406 return -EINVAL;
1407
1408 if (data[IFLA_VXLAN_ID]) {
1409 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
1410 if (id >= VXLAN_VID_MASK)
1411 return -ERANGE;
1412 }
1413
05f47d69 1414 if (data[IFLA_VXLAN_PORT_RANGE]) {
1415 const struct ifla_vxlan_port_range *p
1416 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
1417
1418 if (ntohs(p->high) < ntohs(p->low)) {
1419 pr_debug("port range %u .. %u not valid\n",
1420 ntohs(p->low), ntohs(p->high));
1421 return -EINVAL;
1422 }
1423 }
1424
d342894c 1425 return 0;
1426}
1427
1b13c97f
YB		 1428static void vxlan_get_drvinfo(struct net_device *netdev,
1429 struct ethtool_drvinfo *drvinfo)
1430{
1431 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
1432 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
1433}
1434
1435static const struct ethtool_ops vxlan_ethtool_ops = {
1436 .get_drvinfo = vxlan_get_drvinfo,
1437 .get_link = ethtool_op_get_link,
1438};
1439
553675fb 1440static void vxlan_del_work(struct work_struct *work)
1441{
1442 struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
1443
1444 sk_release_kernel(vs->sock->sk);
1445 kfree_rcu(vs, rcu);
1446}
1447
1448/* Create new listen socket if needed */
1449static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port)
1450{
1451 struct vxlan_sock *vs;
1452 struct sock *sk;
1453 struct sockaddr_in vxlan_addr = {
1454 .sin_family = AF_INET,
1455 .sin_addr.s_addr = htonl(INADDR_ANY),
1456 };
1457 int rc;
31fec5aa 1458 unsigned int h;
553675fb 1459
1460 vs = kmalloc(sizeof(*vs), GFP_KERNEL);
1461 if (!vs)
1462 return ERR_PTR(-ENOMEM);
1463
1464 for (h = 0; h < VNI_HASH_SIZE; ++h)
1465 INIT_HLIST_HEAD(&vs->vni_list[h]);
1466
1467 INIT_WORK(&vs->del_work, vxlan_del_work);
1468
1469 /* Create UDP socket for encapsulation receive. */
1470 rc = sock_create_kern(AF_INET, SOCK_DGRAM, IPPROTO_UDP, &vs->sock);
1471 if (rc < 0) {
1472 pr_debug("UDP socket create failed\n");
1473 kfree(vs);
1474 return ERR_PTR(rc);
1475 }
1476
1477 /* Put in proper namespace */
1478 sk = vs->sock->sk;
1479 sk_change_net(sk, net);
1480
1481 vxlan_addr.sin_port = port;
1482
1483 rc = kernel_bind(vs->sock, (struct sockaddr *) &vxlan_addr,
1484 sizeof(vxlan_addr));
1485 if (rc < 0) {
1486 pr_debug("bind for UDP socket %pI4:%u (%d)\n",
1487 &vxlan_addr.sin_addr, ntohs(vxlan_addr.sin_port), rc);
1488 sk_release_kernel(sk);
1489 kfree(vs);
1490 return ERR_PTR(rc);
1491 }
1492
1493 /* Disable multicast loopback */
1494 inet_sk(sk)->mc_loop = 0;
1495
1496 /* Mark socket as an encapsulation socket. */
1497 udp_sk(sk)->encap_type = 1;
1498 udp_sk(sk)->encap_rcv = vxlan_udp_encap_recv;
1499 udp_encap_enable();
1500
1501 vs->refcnt = 1;
1502 return vs;
1503}
1504
d342894c 1505static int vxlan_newlink(struct net *net, struct net_device *dev,
1506 struct nlattr *tb[], struct nlattr *data[])
1507{
553675fb 1508 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
d342894c 1509 struct vxlan_dev *vxlan = netdev_priv(dev);
c7995c43 1510 struct vxlan_rdst *dst = &vxlan->default_dst;
553675fb 1511 struct vxlan_sock *vs;
d342894c 1512 __u32 vni;
1513 int err;
1514
1515 if (!data[IFLA_VXLAN_ID])
1516 return -EINVAL;
1517
1518 vni = nla_get_u32(data[IFLA_VXLAN_ID]);
c7995c43 1519 dst->remote_vni = vni;
d342894c 1520
5d174dd8 1521 if (data[IFLA_VXLAN_GROUP])
1522 dst->remote_ip = nla_get_be32(data[IFLA_VXLAN_GROUP]);
d342894c 1523
1524 if (data[IFLA_VXLAN_LOCAL])
1525 vxlan->saddr = nla_get_be32(data[IFLA_VXLAN_LOCAL]);
1526
34e02aa1 1527 if (data[IFLA_VXLAN_LINK] &&
c7995c43 1528 (dst->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]))) {
34e02aa1 1529 struct net_device *lowerdev
c7995c43 1530 = __dev_get_by_index(net, dst->remote_ifindex);
34e02aa1 1531
1532 if (!lowerdev) {
c7995c43 1533 pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
34e02aa1 1534 return -ENODEV;
1535 }
d342894c 1536
34e02aa1 1537 if (!tb[IFLA_MTU])
d342894c 1538 dev->mtu = lowerdev->mtu - VXLAN_HEADROOM;
1ba56fb4
AD		 1539
1540 /* update header length based on lower device */
1541 dev->hard_header_len = lowerdev->hard_header_len +
1542 VXLAN_HEADROOM;
d342894c 1543 }
1544
1545 if (data[IFLA_VXLAN_TOS])
1546 vxlan->tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
1547
afb97186
VB		 1548 if (data[IFLA_VXLAN_TTL])
1549 vxlan->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
1550
d342894c 1551 if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
e4f67add 1552 vxlan->flags |= VXLAN_F_LEARN;
d342894c 1553
1554 if (data[IFLA_VXLAN_AGEING])
1555 vxlan->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
1556 else
1557 vxlan->age_interval = FDB_AGE_DEFAULT;
1558
e4f67add
DS		 1559 if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
1560 vxlan->flags |= VXLAN_F_PROXY;
1561
1562 if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
1563 vxlan->flags |= VXLAN_F_RSC;
1564
1565 if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
1566 vxlan->flags |= VXLAN_F_L2MISS;
1567
1568 if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
1569 vxlan->flags |= VXLAN_F_L3MISS;
1570
d342894c 1571 if (data[IFLA_VXLAN_LIMIT])
1572 vxlan->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
1573
05f47d69 1574 if (data[IFLA_VXLAN_PORT_RANGE]) {
1575 const struct ifla_vxlan_port_range *p
1576 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
1577 vxlan->port_min = ntohs(p->low);
1578 vxlan->port_max = ntohs(p->high);
1579 }
1580
823aa873 1581 if (data[IFLA_VXLAN_PORT])
1582 vxlan->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
1583
553675fb 1584 if (vxlan_find_vni(net, vni, vxlan->dst_port)) {
1585 pr_info("duplicate VNI %u\n", vni);
1586 return -EEXIST;
1587 }
1588
1589 vs = vxlan_find_port(net, vxlan->dst_port);
1590 if (vs)
1591 ++vs->refcnt;
1592 else {
1593 /* Drop lock because socket create acquires RTNL lock */
1594 rtnl_unlock();
1595 vs = vxlan_socket_create(net, vxlan->dst_port);
1596 rtnl_lock();
1597 if (IS_ERR(vs))
1598 return PTR_ERR(vs);
1599
1600 hlist_add_head_rcu(&vs->hlist, vs_head(net, vxlan->dst_port));
1601 }
1602 vxlan->vn_sock = vs;
1603
1b13c97f
YB		 1604 SET_ETHTOOL_OPS(dev, &vxlan_ethtool_ops);
1605
d342894c 1606 err = register_netdevice(dev);
553675fb 1607 if (err) {
1608 if (--vs->refcnt == 0) {
1609 rtnl_unlock();
1610 sk_release_kernel(vs->sock->sk);
1611 kfree(vs);
1612 rtnl_lock();
1613 }
1614 return err;
1615 }
d342894c 1616
553675fb 1617 list_add(&vxlan->next, &vn->vxlan_list);
1618 hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
1619
1620 return 0;
d342894c 1621}
1622
1623static void vxlan_dellink(struct net_device *dev, struct list_head *head)
1624{
1625 struct vxlan_dev *vxlan = netdev_priv(dev);
553675fb 1626 struct vxlan_sock *vs = vxlan->vn_sock;
d342894c 1627
1628 hlist_del_rcu(&vxlan->hlist);
553675fb 1629 list_del(&vxlan->next);
d342894c 1630 unregister_netdevice_queue(dev, head);
553675fb 1631
1632 if (--vs->refcnt == 0) {
1633 hlist_del_rcu(&vs->hlist);
1634 schedule_work(&vs->del_work);
1635 }
d342894c 1636}
1637
1638static size_t vxlan_get_size(const struct net_device *dev)
1639{
1640
1641 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
5d174dd8 1642 nla_total_size(sizeof(__be32)) +/* IFLA_VXLAN_GROUP */
d342894c 1643 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
1644 nla_total_size(sizeof(__be32))+ /* IFLA_VXLAN_LOCAL */
1645 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
1646 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
1647 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
e4f67add
DS		 1648 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
1649 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
1650 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
1651 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
d342894c 1652 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
1653 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
05f47d69 1654 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
823aa873 1655 nla_total_size(sizeof(__be16))+ /* IFLA_VXLAN_PORT */
d342894c 1656 0;
1657}
1658
1659static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
1660{
1661 const struct vxlan_dev *vxlan = netdev_priv(dev);
c7995c43 1662 const struct vxlan_rdst *dst = &vxlan->default_dst;
05f47d69 1663 struct ifla_vxlan_port_range ports = {
1664 .low = htons(vxlan->port_min),
1665 .high = htons(vxlan->port_max),
1666 };
d342894c 1667
c7995c43 1668 if (nla_put_u32(skb, IFLA_VXLAN_ID, dst->remote_vni))
d342894c 1669 goto nla_put_failure;
1670
5d174dd8 1671 if (dst->remote_ip && nla_put_be32(skb, IFLA_VXLAN_GROUP, dst->remote_ip))
d342894c 1672 goto nla_put_failure;
1673
c7995c43 1674 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
d342894c 1675 goto nla_put_failure;
1676
7c41c42c 1677 if (vxlan->saddr && nla_put_be32(skb, IFLA_VXLAN_LOCAL, vxlan->saddr))
d342894c 1678 goto nla_put_failure;
1679
1680 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->ttl) ||
1681 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->tos) ||
e4f67add
DS		 1682 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
1683 !!(vxlan->flags & VXLAN_F_LEARN)) ||
1684 nla_put_u8(skb, IFLA_VXLAN_PROXY,
1685 !!(vxlan->flags & VXLAN_F_PROXY)) ||
1686 nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
1687 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
1688 !!(vxlan->flags & VXLAN_F_L2MISS)) ||
1689 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
1690 !!(vxlan->flags & VXLAN_F_L3MISS)) ||
d342894c 1691 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->age_interval) ||
823aa873 1692 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->addrmax) ||
1693 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->dst_port))
d342894c 1694 goto nla_put_failure;
1695
05f47d69 1696 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
1697 goto nla_put_failure;
1698
d342894c 1699 return 0;
1700
1701nla_put_failure:
1702 return -EMSGSIZE;
1703}
1704
1705static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
1706 .kind = "vxlan",
1707 .maxtype = IFLA_VXLAN_MAX,
1708 .policy = vxlan_policy,
1709 .priv_size = sizeof(struct vxlan_dev),
1710 .setup = vxlan_setup,
1711 .validate = vxlan_validate,
1712 .newlink = vxlan_newlink,
1713 .dellink = vxlan_dellink,
1714 .get_size = vxlan_get_size,
1715 .fill_info = vxlan_fill_info,
1716};
1717
1718static __net_init int vxlan_init_net(struct net *net)
1719{
1720 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
31fec5aa 1721 unsigned int h;
d342894c 1722
553675fb 1723 INIT_LIST_HEAD(&vn->vxlan_list);
d342894c 1724
553675fb 1725 for (h = 0; h < PORT_HASH_SIZE; ++h)
1726 INIT_HLIST_HEAD(&vn->sock_list[h]);
d342894c 1727
1728 return 0;
1729}
1730
1731static __net_exit void vxlan_exit_net(struct net *net)
1732{
1733 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
9cb6cb7e 1734 struct vxlan_dev *vxlan;
9cb6cb7e
ZM		 1735
1736 rtnl_lock();
553675fb 1737 list_for_each_entry(vxlan, &vn->vxlan_list, next)
1738 dev_close(vxlan->dev);
9cb6cb7e 1739 rtnl_unlock();
d342894c 1740}
1741
1742static struct pernet_operations vxlan_net_ops = {
1743 .init = vxlan_init_net,
1744 .exit = vxlan_exit_net,
1745 .id = &vxlan_net_id,
1746 .size = sizeof(struct vxlan_net),
1747};
1748
1749static int __init vxlan_init_module(void)
1750{
1751 int rc;
1752
1753 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
1754
1755 rc = register_pernet_device(&vxlan_net_ops);
1756 if (rc)
1757 goto out1;
1758
1759 rc = rtnl_link_register(&vxlan_link_ops);
1760 if (rc)
1761 goto out2;
1762
1763 return 0;
1764
1765out2:
1766 unregister_pernet_device(&vxlan_net_ops);
1767out1:
1768 return rc;
1769}
7332a13b 1770late_initcall(vxlan_init_module);
d342894c 1771
1772static void __exit vxlan_cleanup_module(void)
1773{
d342894c 1774 unregister_pernet_device(&vxlan_net_ops);
b7153984 1775 rtnl_link_unregister(&vxlan_link_ops);
6681712d 1776 rcu_barrier();
d342894c 1777}
1778module_exit(vxlan_cleanup_module);
1779
1780MODULE_LICENSE("GPL");
1781MODULE_VERSION(VXLAN_VERSION);
3b8df3c6 1782MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
d342894c 1783MODULE_ALIAS_RTNL_LINK("vxlan");
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