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vxlan: move vxlan device lookup before iptunnel_pull_header
[mirror_ubuntu-jammy-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.
d342894c 9 */
10
11#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13#include <linux/kernel.h>
14#include <linux/types.h>
15#include <linux/module.h>
16#include <linux/errno.h>
17#include <linux/slab.h>
18#include <linux/skbuff.h>
19#include <linux/rculist.h>
20#include <linux/netdevice.h>
21#include <linux/in.h>
22#include <linux/ip.h>
23#include <linux/udp.h>
24#include <linux/igmp.h>
25#include <linux/etherdevice.h>
26#include <linux/if_ether.h>
1eaa8178 27#include <linux/if_vlan.h>
d342894c 28#include <linux/hash.h>
1b13c97f 29#include <linux/ethtool.h>
e4f67add
DS		 30#include <net/arp.h>
31#include <net/ndisc.h>
d342894c 32#include <net/ip.h>
c5441932 33#include <net/ip_tunnels.h>
d342894c 34#include <net/icmp.h>
35#include <net/udp.h>
3ee64f39 36#include <net/udp_tunnel.h>
d342894c 37#include <net/rtnetlink.h>
38#include <net/route.h>
39#include <net/dsfield.h>
40#include <net/inet_ecn.h>
41#include <net/net_namespace.h>
42#include <net/netns/generic.h>
012a5729 43#include <net/vxlan.h>
dc01e7d3 44#include <net/protocol.h>
40d29af0 45
e4c7ed41
CW		 46#if IS_ENABLED(CONFIG_IPV6)
47#include <net/ipv6.h>
48#include <net/addrconf.h>
49#include <net/ip6_tunnel.h>
660d98ca 50#include <net/ip6_checksum.h>
e4c7ed41 51#endif
ee122c79 52#include <net/dst_metadata.h>
d342894c 53
54#define VXLAN_VERSION "0.1"
55
553675fb 56#define PORT_HASH_BITS 8
57#define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
d342894c 58#define FDB_AGE_DEFAULT 300 /* 5 min */
59#define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
60
23c578bf 61/* UDP port for VXLAN traffic.
62 * The IANA assigned port is 4789, but the Linux default is 8472
234f5b73 63 * for compatibility with early adopters.
23c578bf 64 */
9daaa397
SH		 65static unsigned short vxlan_port __read_mostly = 8472;
66module_param_named(udp_port, vxlan_port, ushort, 0444);
d342894c 67MODULE_PARM_DESC(udp_port, "Destination UDP port");
68
69static bool log_ecn_error = true;
70module_param(log_ecn_error, bool, 0644);
71MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
72
60d9d4c6 73static int vxlan_net_id;
0dfbdf41 74static struct rtnl_link_ops vxlan_link_ops;
553675fb 75
7256eac1 76static const u8 all_zeros_mac[ETH_ALEN + 2];
afbd8bae 77
205f356d 78static int vxlan_sock_add(struct vxlan_dev *vxlan);
614732ea 79
553675fb 80/* per-network namespace private data for this module */
81struct vxlan_net {
82 struct list_head vxlan_list;
83 struct hlist_head sock_list[PORT_HASH_SIZE];
1c51a915 84 spinlock_t sock_lock;
553675fb 85};
86
d342894c 87/* Forwarding table entry */
88struct vxlan_fdb {
89 struct hlist_node hlist; /* linked list of entries */
90 struct rcu_head rcu;
91 unsigned long updated; /* jiffies */
92 unsigned long used;
3e61aa8f 93 struct list_head remotes;
7177a3b0 94 u8 eth_addr[ETH_ALEN];
d342894c 95 u16 state; /* see ndm_state */
ae884082 96 u8 flags; /* see ndm_flags */
d342894c 97};
98
d342894c 99/* salt for hash table */
100static u32 vxlan_salt __read_mostly;
758c57d1 101static struct workqueue_struct *vxlan_wq;
d342894c 102
ee122c79
TG		 103static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
104{
e7030878
TG		 105 return vs->flags & VXLAN_F_COLLECT_METADATA ||
106 ip_tunnel_collect_metadata();
ee122c79
TG		 107}
108
e4c7ed41
CW		 109#if IS_ENABLED(CONFIG_IPV6)
110static inline
111bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
112{
f0ef3126
JB		 113 if (a->sa.sa_family != b->sa.sa_family)
114 return false;
115 if (a->sa.sa_family == AF_INET6)
116 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
117 else
118 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
e4c7ed41
CW		 119}
120
121static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
122{
f0ef3126
JB		 123 if (ipa->sa.sa_family == AF_INET6)
124 return ipv6_addr_any(&ipa->sin6.sin6_addr);
125 else
126 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
e4c7ed41
CW		 127}
128
129static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
130{
f0ef3126
JB		 131 if (ipa->sa.sa_family == AF_INET6)
132 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
133 else
134 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
e4c7ed41
CW		 135}
136
137static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
138{
f0ef3126 139 if (nla_len(nla) >= sizeof(struct in6_addr)) {
67b61f6c 140 ip->sin6.sin6_addr = nla_get_in6_addr(nla);
f0ef3126
JB		 141 ip->sa.sa_family = AF_INET6;
142 return 0;
143 } else if (nla_len(nla) >= sizeof(__be32)) {
67b61f6c 144 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
f0ef3126
JB		 145 ip->sa.sa_family = AF_INET;
146 return 0;
147 } else {
148 return -EAFNOSUPPORT;
149 }
e4c7ed41
CW		 150}
151
152static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
f0ef3126 153 const union vxlan_addr *ip)
e4c7ed41 154{
f0ef3126 155 if (ip->sa.sa_family == AF_INET6)
930345ea 156 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
f0ef3126 157 else
930345ea 158 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
e4c7ed41
CW		 159}
160
161#else /* !CONFIG_IPV6 */
162
163static inline
164bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
165{
f0ef3126 166 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
e4c7ed41
CW		 167}
168
169static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
170{
f0ef3126 171 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
e4c7ed41
CW		 172}
173
174static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
175{
f0ef3126 176 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
e4c7ed41
CW		 177}
178
179static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
180{
f0ef3126
JB		 181 if (nla_len(nla) >= sizeof(struct in6_addr)) {
182 return -EAFNOSUPPORT;
183 } else if (nla_len(nla) >= sizeof(__be32)) {
67b61f6c 184 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
f0ef3126
JB		 185 ip->sa.sa_family = AF_INET;
186 return 0;
187 } else {
188 return -EAFNOSUPPORT;
189 }
e4c7ed41
CW		 190}
191
192static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
f0ef3126 193 const union vxlan_addr *ip)
e4c7ed41 194{
930345ea 195 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
e4c7ed41
CW		 196}
197#endif
198
553675fb 199/* Virtual Network hash table head */
54bfd872 200static inline struct hlist_head *vni_head(struct vxlan_sock *vs, __be32 vni)
553675fb 201{
54bfd872 202 return &vs->vni_list[hash_32((__force u32)vni, VNI_HASH_BITS)];
553675fb 203}
204
205/* Socket hash table head */
206static inline struct hlist_head *vs_head(struct net *net, __be16 port)
d342894c 207{
208 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
209
553675fb 210 return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
211}
212
3e61aa8f
SH		 213/* First remote destination for a forwarding entry.
214 * Guaranteed to be non-NULL because remotes are never deleted.
215 */
5ca5461c 216static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
3e61aa8f 217{
5ca5461c 218 return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
219}
220
221static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
222{
223 return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
3e61aa8f
SH		 224}
225
ac5132d1
TG		 226/* Find VXLAN socket based on network namespace, address family and UDP port
227 * and enabled unshareable flags.
228 */
229static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
230 __be16 port, u32 flags)
553675fb 231{
232 struct vxlan_sock *vs;
af33c1ad
TH		 233
234 flags &= VXLAN_F_RCV_FLAGS;
553675fb 235
236 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
19ca9fc1 237 if (inet_sk(vs->sock->sk)->inet_sport == port &&
705cc62f 238 vxlan_get_sk_family(vs) == family &&
af33c1ad 239 vs->flags == flags)
553675fb 240 return vs;
241 }
242 return NULL;
d342894c 243}
244
54bfd872 245static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, __be32 vni)
d342894c 246{
247 struct vxlan_dev *vxlan;
d342894c 248
b9167b2e
JB		 249 /* For flow based devices, map all packets to VNI 0 */
250 if (vs->flags & VXLAN_F_COLLECT_METADATA)
251 vni = 0;
252
54bfd872
JB		 253 hlist_for_each_entry_rcu(vxlan, vni_head(vs, vni), hlist) {
254 if (vxlan->default_dst.remote_vni == vni)
d342894c 255 return vxlan;
256 }
257
258 return NULL;
259}
260
5cfccc5a 261/* Look up VNI in a per net namespace table */
54bfd872 262static struct vxlan_dev *vxlan_find_vni(struct net *net, __be32 vni,
ac5132d1
TG		 263 sa_family_t family, __be16 port,
264 u32 flags)
5cfccc5a
PS		 265{
266 struct vxlan_sock *vs;
267
ac5132d1 268 vs = vxlan_find_sock(net, family, port, flags);
5cfccc5a
PS		 269 if (!vs)
270 return NULL;
271
54bfd872 272 return vxlan_vs_find_vni(vs, vni);
5cfccc5a
PS		 273}
274
d342894c 275/* Fill in neighbour message in skbuff. */
276static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
234f5b73
SH		 277 const struct vxlan_fdb *fdb,
278 u32 portid, u32 seq, int type, unsigned int flags,
279 const struct vxlan_rdst *rdst)
d342894c 280{
281 unsigned long now = jiffies;
282 struct nda_cacheinfo ci;
283 struct nlmsghdr *nlh;
284 struct ndmsg *ndm;
e4f67add 285 bool send_ip, send_eth;
d342894c 286
287 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
288 if (nlh == NULL)
289 return -EMSGSIZE;
290
291 ndm = nlmsg_data(nlh);
292 memset(ndm, 0, sizeof(*ndm));
e4f67add
DS		 293
294 send_eth = send_ip = true;
295
296 if (type == RTM_GETNEIGH) {
297 ndm->ndm_family = AF_INET;
e4c7ed41 298 send_ip = !vxlan_addr_any(&rdst->remote_ip);
e4f67add
DS		 299 send_eth = !is_zero_ether_addr(fdb->eth_addr);
300 } else
301 ndm->ndm_family = AF_BRIDGE;
d342894c 302 ndm->ndm_state = fdb->state;
303 ndm->ndm_ifindex = vxlan->dev->ifindex;
ae884082 304 ndm->ndm_flags = fdb->flags;
545469f7 305 ndm->ndm_type = RTN_UNICAST;
d342894c 306
193523bf 307 if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
4967082b 308 nla_put_s32(skb, NDA_LINK_NETNSID,
7a0877d4 309 peernet2id_alloc(dev_net(vxlan->dev), vxlan->net)))
193523bf
ND		 310 goto nla_put_failure;
311
e4f67add 312 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
d342894c 313 goto nla_put_failure;
314
e4c7ed41 315 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
6681712d
DS		 316 goto nla_put_failure;
317
0dfbdf41 318 if (rdst->remote_port && rdst->remote_port != vxlan->cfg.dst_port &&
6681712d
DS		 319 nla_put_be16(skb, NDA_PORT, rdst->remote_port))
320 goto nla_put_failure;
c7995c43 321 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
54bfd872 322 nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni)))
6681712d
DS		 323 goto nla_put_failure;
324 if (rdst->remote_ifindex &&
325 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
d342894c 326 goto nla_put_failure;
327
328 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
329 ci.ndm_confirmed = 0;
330 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
331 ci.ndm_refcnt = 0;
332
333 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
334 goto nla_put_failure;
335
053c095a
JB		 336 nlmsg_end(skb, nlh);
337 return 0;
d342894c 338
339nla_put_failure:
340 nlmsg_cancel(skb, nlh);
341 return -EMSGSIZE;
342}
343
344static inline size_t vxlan_nlmsg_size(void)
345{
346 return NLMSG_ALIGN(sizeof(struct ndmsg))
347 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
e4c7ed41 348 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
73cf3317 349 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
6681712d
DS		 350 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
351 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
4967082b 352 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
d342894c 353 + nla_total_size(sizeof(struct nda_cacheinfo));
354}
355
9e4b93f9
ND		 356static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
357 struct vxlan_rdst *rd, int type)
d342894c 358{
359 struct net *net = dev_net(vxlan->dev);
360 struct sk_buff *skb;
361 int err = -ENOBUFS;
362
363 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
364 if (skb == NULL)
365 goto errout;
366
9e4b93f9 367 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
d342894c 368 if (err < 0) {
369 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
370 WARN_ON(err == -EMSGSIZE);
371 kfree_skb(skb);
372 goto errout;
373 }
374
375 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
376 return;
377errout:
378 if (err < 0)
379 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
380}
381
e4c7ed41 382static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
e4f67add
DS		 383{
384 struct vxlan_dev *vxlan = netdev_priv(dev);
bb3fd687
SH		 385 struct vxlan_fdb f = {
386 .state = NUD_STALE,
387 };
388 struct vxlan_rdst remote = {
e4c7ed41 389 .remote_ip = *ipa, /* goes to NDA_DST */
54bfd872 390 .remote_vni = cpu_to_be32(VXLAN_N_VID),
bb3fd687 391 };
3e61aa8f 392
9e4b93f9 393 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
e4f67add
DS		 394}
395
396static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
397{
bb3fd687
SH		 398 struct vxlan_fdb f = {
399 .state = NUD_STALE,
400 };
9e4b93f9 401 struct vxlan_rdst remote = { };
e4f67add 402
e4f67add
DS		 403 memcpy(f.eth_addr, eth_addr, ETH_ALEN);
404
9e4b93f9 405 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
e4f67add
DS		 406}
407
d342894c 408/* Hash Ethernet address */
409static u32 eth_hash(const unsigned char *addr)
410{
411 u64 value = get_unaligned((u64 *)addr);
412
413 /* only want 6 bytes */
414#ifdef __BIG_ENDIAN
d342894c 415 value >>= 16;
321fb991 416#else
417 value <<= 16;
d342894c 418#endif
419 return hash_64(value, FDB_HASH_BITS);
420}
421
422/* Hash chain to use given mac address */
423static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
424 const u8 *mac)
425{
426 return &vxlan->fdb_head[eth_hash(mac)];
427}
428
429/* Look up Ethernet address in forwarding table */
014be2c8 430static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
d342894c 431 const u8 *mac)
d342894c 432{
433 struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
434 struct vxlan_fdb *f;
d342894c 435
b67bfe0d 436 hlist_for_each_entry_rcu(f, head, hlist) {
7367d0b5 437 if (ether_addr_equal(mac, f->eth_addr))
d342894c 438 return f;
439 }
440
441 return NULL;
442}
443
014be2c8
SS		 444static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
445 const u8 *mac)
446{
447 struct vxlan_fdb *f;
448
449 f = __vxlan_find_mac(vxlan, mac);
450 if (f)
451 f->used = jiffies;
452
453 return f;
454}
455
a5e7c10a
MR		 456/* caller should hold vxlan->hash_lock */
457static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
e4c7ed41 458 union vxlan_addr *ip, __be16 port,
54bfd872 459 __be32 vni, __u32 ifindex)
6681712d 460{
3e61aa8f 461 struct vxlan_rdst *rd;
6681712d 462
3e61aa8f 463 list_for_each_entry(rd, &f->remotes, list) {
e4c7ed41 464 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
6681712d
DS		 465 rd->remote_port == port &&
466 rd->remote_vni == vni &&
467 rd->remote_ifindex == ifindex)
a5e7c10a 468 return rd;
6681712d 469 }
3e61aa8f 470
a5e7c10a
MR		 471 return NULL;
472}
473
906dc186
TR		 474/* Replace destination of unicast mac */
475static int vxlan_fdb_replace(struct vxlan_fdb *f,
54bfd872
JB		 476 union vxlan_addr *ip, __be16 port, __be32 vni,
477 __u32 ifindex)
906dc186
TR		 478{
479 struct vxlan_rdst *rd;
480
481 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
482 if (rd)
483 return 0;
484
485 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
486 if (!rd)
487 return 0;
0c1d70af
PA		 488
489 dst_cache_reset(&rd->dst_cache);
e4c7ed41 490 rd->remote_ip = *ip;
906dc186
TR		 491 rd->remote_port = port;
492 rd->remote_vni = vni;
493 rd->remote_ifindex = ifindex;
494 return 1;
495}
496
a5e7c10a
MR		 497/* Add/update destinations for multicast */
498static int vxlan_fdb_append(struct vxlan_fdb *f,
54bfd872 499 union vxlan_addr *ip, __be16 port, __be32 vni,
9e4b93f9 500 __u32 ifindex, struct vxlan_rdst **rdp)
a5e7c10a
MR		 501{
502 struct vxlan_rdst *rd;
503
504 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
505 if (rd)
506 return 0;
507
6681712d
DS		 508 rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
509 if (rd == NULL)
510 return -ENOBUFS;
0c1d70af
PA		 511
512 if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) {
513 kfree(rd);
514 return -ENOBUFS;
515 }
516
e4c7ed41 517 rd->remote_ip = *ip;
6681712d
DS		 518 rd->remote_port = port;
519 rd->remote_vni = vni;
520 rd->remote_ifindex = ifindex;
3e61aa8f
SH		 521
522 list_add_tail_rcu(&rd->list, &f->remotes);
523
9e4b93f9 524 *rdp = rd;
6681712d
DS		 525 return 1;
526}
527
dfd8645e
TH		 528static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
529 unsigned int off,
530 struct vxlanhdr *vh, size_t hdrlen,
54bfd872
JB		 531 __be32 vni_field,
532 struct gro_remcsum *grc,
0ace2ca8 533 bool nopartial)
dfd8645e 534{
b7fe10e5 535 size_t start, offset;
dfd8645e
TH		 536
537 if (skb->remcsum_offload)
b7fe10e5 538 return vh;
dfd8645e
TH		 539
540 if (!NAPI_GRO_CB(skb)->csum_valid)
541 return NULL;
542
54bfd872
JB		 543 start = vxlan_rco_start(vni_field);
544 offset = start + vxlan_rco_offset(vni_field);
dfd8645e 545
b7fe10e5
TH		 546 vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
547 start, offset, grc, nopartial);
dfd8645e
TH		 548
549 skb->remcsum_offload = 1;
550
551 return vh;
552}
553
a2b12f3c
TH		 554static struct sk_buff **vxlan_gro_receive(struct sk_buff **head,
555 struct sk_buff *skb,
556 struct udp_offload *uoff)
dc01e7d3
OG		 557{
558 struct sk_buff *p, **pp = NULL;
559 struct vxlanhdr *vh, *vh2;
9b174d88 560 unsigned int hlen, off_vx;
dc01e7d3 561 int flush = 1;
dfd8645e
TH		 562 struct vxlan_sock *vs = container_of(uoff, struct vxlan_sock,
563 udp_offloads);
54bfd872 564 __be32 flags;
26c4f7da
TH		 565 struct gro_remcsum grc;
566
567 skb_gro_remcsum_init(&grc);
dc01e7d3
OG		 568
569 off_vx = skb_gro_offset(skb);
570 hlen = off_vx + sizeof(*vh);
571 vh = skb_gro_header_fast(skb, off_vx);
572 if (skb_gro_header_hard(skb, hlen)) {
573 vh = skb_gro_header_slow(skb, hlen, off_vx);
574 if (unlikely(!vh))
575 goto out;
576 }
dc01e7d3 577
dfd8645e
TH		 578 skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
579
54bfd872 580 flags = vh->vx_flags;
dfd8645e
TH		 581
582 if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
583 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
54bfd872 584 vh->vx_vni, &grc,
0ace2ca8
TH		 585 !!(vs->flags &
586 VXLAN_F_REMCSUM_NOPARTIAL));
dfd8645e
TH		 587
588 if (!vh)
589 goto out;
590 }
591
b7fe10e5
TH		 592 skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
593
dc01e7d3
OG		 594 flush = 0;
595
596 for (p = *head; p; p = p->next) {
597 if (!NAPI_GRO_CB(p)->same_flow)
598 continue;
599
600 vh2 = (struct vxlanhdr *)(p->data + off_vx);
3511494c
TG		 601 if (vh->vx_flags != vh2->vx_flags ||
602 vh->vx_vni != vh2->vx_vni) {
dc01e7d3
OG		 603 NAPI_GRO_CB(p)->same_flow = 0;
604 continue;
605 }
dc01e7d3
OG		 606 }
607
9b174d88 608 pp = eth_gro_receive(head, skb);
dc01e7d3 609
dc01e7d3 610out:
26c4f7da 611 skb_gro_remcsum_cleanup(skb, &grc);
dc01e7d3
OG		 612 NAPI_GRO_CB(skb)->flush |= flush;
613
614 return pp;
615}
616
a2b12f3c
TH		 617static int vxlan_gro_complete(struct sk_buff *skb, int nhoff,
618 struct udp_offload *uoff)
dc01e7d3 619{
cfdf1e1b
JG		 620 udp_tunnel_gro_complete(skb, nhoff);
621
9b174d88 622 return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
dc01e7d3
OG		 623}
624
53cf5275 625/* Notify netdevs that UDP port started listening */
dc01e7d3 626static void vxlan_notify_add_rx_port(struct vxlan_sock *vs)
53cf5275
JG		 627{
628 struct net_device *dev;
dc01e7d3 629 struct sock *sk = vs->sock->sk;
53cf5275 630 struct net *net = sock_net(sk);
705cc62f 631 sa_family_t sa_family = vxlan_get_sk_family(vs);
35e42379 632 __be16 port = inet_sk(sk)->inet_sport;
dc01e7d3
OG		 633 int err;
634
635 if (sa_family == AF_INET) {
787d7ac3 636 err = udp_add_offload(net, &vs->udp_offloads);
dc01e7d3
OG		 637 if (err)
638 pr_warn("vxlan: udp_add_offload failed with status %d\n", err);
639 }
53cf5275
JG		 640
641 rcu_read_lock();
642 for_each_netdev_rcu(net, dev) {
643 if (dev->netdev_ops->ndo_add_vxlan_port)
644 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
645 port);
646 }
647 rcu_read_unlock();
648}
649
650/* Notify netdevs that UDP port is no more listening */
dc01e7d3 651static void vxlan_notify_del_rx_port(struct vxlan_sock *vs)
53cf5275
JG		 652{
653 struct net_device *dev;
dc01e7d3 654 struct sock *sk = vs->sock->sk;
53cf5275 655 struct net *net = sock_net(sk);
705cc62f 656 sa_family_t sa_family = vxlan_get_sk_family(vs);
35e42379 657 __be16 port = inet_sk(sk)->inet_sport;
53cf5275
JG		 658
659 rcu_read_lock();
660 for_each_netdev_rcu(net, dev) {
661 if (dev->netdev_ops->ndo_del_vxlan_port)
662 dev->netdev_ops->ndo_del_vxlan_port(dev, sa_family,
663 port);
664 }
665 rcu_read_unlock();
dc01e7d3
OG		 666
667 if (sa_family == AF_INET)
668 udp_del_offload(&vs->udp_offloads);
53cf5275
JG		 669}
670
d342894c 671/* Add new entry to forwarding table -- assumes lock held */
672static int vxlan_fdb_create(struct vxlan_dev *vxlan,
e4c7ed41 673 const u8 *mac, union vxlan_addr *ip,
6681712d 674 __u16 state, __u16 flags,
54bfd872 675 __be16 port, __be32 vni, __u32 ifindex,
ae884082 676 __u8 ndm_flags)
d342894c 677{
9e4b93f9 678 struct vxlan_rdst *rd = NULL;
d342894c 679 struct vxlan_fdb *f;
680 int notify = 0;
681
014be2c8 682 f = __vxlan_find_mac(vxlan, mac);
d342894c 683 if (f) {
684 if (flags & NLM_F_EXCL) {
685 netdev_dbg(vxlan->dev,
686 "lost race to create %pM\n", mac);
687 return -EEXIST;
688 }
689 if (f->state != state) {
690 f->state = state;
691 f->updated = jiffies;
692 notify = 1;
693 }
ae884082
DS		 694 if (f->flags != ndm_flags) {
695 f->flags = ndm_flags;
696 f->updated = jiffies;
697 notify = 1;
698 }
906dc186
TR		 699 if ((flags & NLM_F_REPLACE)) {
700 /* Only change unicasts */
701 if (!(is_multicast_ether_addr(f->eth_addr) ||
702 is_zero_ether_addr(f->eth_addr))) {
60840429 703 notify |= vxlan_fdb_replace(f, ip, port, vni,
906dc186 704 ifindex);
906dc186
TR		 705 } else
706 return -EOPNOTSUPP;
707 }
6681712d 708 if ((flags & NLM_F_APPEND) &&
58e4c767
MR		 709 (is_multicast_ether_addr(f->eth_addr) ||
710 is_zero_ether_addr(f->eth_addr))) {
9e4b93f9
ND		 711 int rc = vxlan_fdb_append(f, ip, port, vni, ifindex,
712 &rd);
6681712d
DS		 713
714 if (rc < 0)
715 return rc;
716 notify |= rc;
717 }
d342894c 718 } else {
719 if (!(flags & NLM_F_CREATE))
720 return -ENOENT;
721
0dfbdf41
TG		 722 if (vxlan->cfg.addrmax &&
723 vxlan->addrcnt >= vxlan->cfg.addrmax)
d342894c 724 return -ENOSPC;
725
906dc186
TR		 726 /* Disallow replace to add a multicast entry */
727 if ((flags & NLM_F_REPLACE) &&
728 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
729 return -EOPNOTSUPP;
730
e4c7ed41 731 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
d342894c 732 f = kmalloc(sizeof(*f), GFP_ATOMIC);
733 if (!f)
734 return -ENOMEM;
735
736 notify = 1;
d342894c 737 f->state = state;
ae884082 738 f->flags = ndm_flags;
d342894c 739 f->updated = f->used = jiffies;
3e61aa8f 740 INIT_LIST_HEAD(&f->remotes);
d342894c 741 memcpy(f->eth_addr, mac, ETH_ALEN);
742
9e4b93f9 743 vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
3e61aa8f 744
d342894c 745 ++vxlan->addrcnt;
746 hlist_add_head_rcu(&f->hlist,
747 vxlan_fdb_head(vxlan, mac));
748 }
749
9e4b93f9
ND		 750 if (notify) {
751 if (rd == NULL)
752 rd = first_remote_rtnl(f);
753 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
754 }
d342894c 755
756 return 0;
757}
758
6706c82e 759static void vxlan_fdb_free(struct rcu_head *head)
6681712d
DS		 760{
761 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
3e61aa8f 762 struct vxlan_rdst *rd, *nd;
6681712d 763
0c1d70af
PA		 764 list_for_each_entry_safe(rd, nd, &f->remotes, list) {
765 dst_cache_destroy(&rd->dst_cache);
6681712d 766 kfree(rd);
0c1d70af 767 }
6681712d
DS		 768 kfree(f);
769}
770
d342894c 771static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
772{
773 netdev_dbg(vxlan->dev,
774 "delete %pM\n", f->eth_addr);
775
776 --vxlan->addrcnt;
9e4b93f9 777 vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
d342894c 778
779 hlist_del_rcu(&f->hlist);
6681712d 780 call_rcu(&f->rcu, vxlan_fdb_free);
d342894c 781}
782
f0b074be 783static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
54bfd872
JB		 784 union vxlan_addr *ip, __be16 *port, __be32 *vni,
785 u32 *ifindex)
d342894c 786{
6681712d 787 struct net *net = dev_net(vxlan->dev);
e4c7ed41 788 int err;
d342894c 789
f0b074be 790 if (tb[NDA_DST]) {
e4c7ed41
CW		 791 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
792 if (err)
793 return err;
f0b074be 794 } else {
e4c7ed41
CW		 795 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
796 if (remote->sa.sa_family == AF_INET) {
797 ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
798 ip->sa.sa_family = AF_INET;
799#if IS_ENABLED(CONFIG_IPV6)
800 } else {
801 ip->sin6.sin6_addr = in6addr_any;
802 ip->sa.sa_family = AF_INET6;
803#endif
804 }
f0b074be 805 }
d342894c 806
6681712d 807 if (tb[NDA_PORT]) {
73cf3317 808 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
6681712d 809 return -EINVAL;
f0b074be
MR		 810 *port = nla_get_be16(tb[NDA_PORT]);
811 } else {
0dfbdf41 812 *port = vxlan->cfg.dst_port;
f0b074be 813 }
6681712d
DS		 814
815 if (tb[NDA_VNI]) {
816 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
817 return -EINVAL;
54bfd872 818 *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
f0b074be
MR		 819 } else {
820 *vni = vxlan->default_dst.remote_vni;
821 }
6681712d
DS		 822
823 if (tb[NDA_IFINDEX]) {
5abb0029 824 struct net_device *tdev;
6681712d
DS		 825
826 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
827 return -EINVAL;
f0b074be 828 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
73763949 829 tdev = __dev_get_by_index(net, *ifindex);
5abb0029 830 if (!tdev)
6681712d 831 return -EADDRNOTAVAIL;
f0b074be
MR		 832 } else {
833 *ifindex = 0;
834 }
835
836 return 0;
837}
838
839/* Add static entry (via netlink) */
840static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
841 struct net_device *dev,
f6f6424b 842 const unsigned char *addr, u16 vid, u16 flags)
f0b074be
MR		 843{
844 struct vxlan_dev *vxlan = netdev_priv(dev);
845 /* struct net *net = dev_net(vxlan->dev); */
e4c7ed41 846 union vxlan_addr ip;
f0b074be 847 __be16 port;
54bfd872
JB		 848 __be32 vni;
849 u32 ifindex;
f0b074be
MR		 850 int err;
851
852 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
853 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
854 ndm->ndm_state);
855 return -EINVAL;
856 }
857
858 if (tb[NDA_DST] == NULL)
859 return -EINVAL;
860
861 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
862 if (err)
863 return err;
6681712d 864
5933a7bb
MR		 865 if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
866 return -EAFNOSUPPORT;
867
d342894c 868 spin_lock_bh(&vxlan->hash_lock);
e4c7ed41 869 err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
73cf3317 870 port, vni, ifindex, ndm->ndm_flags);
d342894c 871 spin_unlock_bh(&vxlan->hash_lock);
872
873 return err;
874}
875
876/* Delete entry (via netlink) */
1690be63
VY		 877static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
878 struct net_device *dev,
f6f6424b 879 const unsigned char *addr, u16 vid)
d342894c 880{
881 struct vxlan_dev *vxlan = netdev_priv(dev);
882 struct vxlan_fdb *f;
bc7892ba 883 struct vxlan_rdst *rd = NULL;
e4c7ed41 884 union vxlan_addr ip;
bc7892ba 885 __be16 port;
54bfd872
JB		 886 __be32 vni;
887 u32 ifindex;
bc7892ba
MR		 888 int err;
889
890 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
891 if (err)
892 return err;
893
894 err = -ENOENT;
d342894c 895
896 spin_lock_bh(&vxlan->hash_lock);
897 f = vxlan_find_mac(vxlan, addr);
bc7892ba
MR		 898 if (!f)
899 goto out;
900
e4c7ed41
CW		 901 if (!vxlan_addr_any(&ip)) {
902 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
bc7892ba
MR		 903 if (!rd)
904 goto out;
905 }
906
907 err = 0;
908
909 /* remove a destination if it's not the only one on the list,
910 * otherwise destroy the fdb entry
911 */
912 if (rd && !list_is_singular(&f->remotes)) {
913 list_del_rcu(&rd->list);
9e4b93f9 914 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
dcdc7a59 915 kfree_rcu(rd, rcu);
bc7892ba 916 goto out;
d342894c 917 }
bc7892ba
MR		 918
919 vxlan_fdb_destroy(vxlan, f);
920
921out:
d342894c 922 spin_unlock_bh(&vxlan->hash_lock);
923
924 return err;
925}
926
927/* Dump forwarding table */
928static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
5d5eacb3
JHS		 929 struct net_device *dev,
930 struct net_device *filter_dev, int idx)
d342894c 931{
932 struct vxlan_dev *vxlan = netdev_priv(dev);
933 unsigned int h;
934
935 for (h = 0; h < FDB_HASH_SIZE; ++h) {
936 struct vxlan_fdb *f;
d342894c 937 int err;
938
b67bfe0d 939 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
6681712d 940 struct vxlan_rdst *rd;
6681712d 941
3e61aa8f 942 list_for_each_entry_rcu(rd, &f->remotes, list) {
07a51cd3
AW		 943 if (idx < cb->args[0])
944 goto skip;
945
6681712d
DS		 946 err = vxlan_fdb_info(skb, vxlan, f,
947 NETLINK_CB(cb->skb).portid,
948 cb->nlh->nlmsg_seq,
949 RTM_NEWNEIGH,
950 NLM_F_MULTI, rd);
951 if (err < 0)
3e61aa8f 952 goto out;
3e61aa8f 953skip:
07a51cd3
AW		 954 ++idx;
955 }
d342894c 956 }
957 }
3e61aa8f 958out:
d342894c 959 return idx;
960}
961
962/* Watch incoming packets to learn mapping between Ethernet address
963 * and Tunnel endpoint.
c4b49512 964 * Return true if packet is bogus and should be dropped.
d342894c 965 */
26a41ae6 966static bool vxlan_snoop(struct net_device *dev,
e4c7ed41 967 union vxlan_addr *src_ip, const u8 *src_mac)
d342894c 968{
969 struct vxlan_dev *vxlan = netdev_priv(dev);
970 struct vxlan_fdb *f;
d342894c 971
972 f = vxlan_find_mac(vxlan, src_mac);
973 if (likely(f)) {
5ca5461c 974 struct vxlan_rdst *rdst = first_remote_rcu(f);
3e61aa8f 975
e4c7ed41 976 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
26a41ae6 977 return false;
978
979 /* Don't migrate static entries, drop packets */
eb064c3b 980 if (f->state & NUD_NOARP)
26a41ae6 981 return true;
d342894c 982
983 if (net_ratelimit())
984 netdev_info(dev,
e4c7ed41 985 "%pM migrated from %pIS to %pIS\n",
a4870f79 986 src_mac, &rdst->remote_ip.sa, &src_ip->sa);
d342894c 987
e4c7ed41 988 rdst->remote_ip = *src_ip;
d342894c 989 f->updated = jiffies;
9e4b93f9 990 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
d342894c 991 } else {
992 /* learned new entry */
993 spin_lock(&vxlan->hash_lock);
3bf74b1a 994
995 /* close off race between vxlan_flush and incoming packets */
996 if (netif_running(dev))
997 vxlan_fdb_create(vxlan, src_mac, src_ip,
998 NUD_REACHABLE,
999 NLM_F_EXCL|NLM_F_CREATE,
0dfbdf41 1000 vxlan->cfg.dst_port,
3bf74b1a 1001 vxlan->default_dst.remote_vni,
1002 0, NTF_SELF);
d342894c 1003 spin_unlock(&vxlan->hash_lock);
1004 }
26a41ae6 1005
1006 return false;
d342894c 1007}
1008
d342894c 1009/* See if multicast group is already in use by other ID */
95ab0991 1010static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
d342894c 1011{
553675fb 1012 struct vxlan_dev *vxlan;
b1be00a6 1013 unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
d342894c 1014
95ab0991
G		 1015 /* The vxlan_sock is only used by dev, leaving group has
1016 * no effect on other vxlan devices.
1017 */
b1be00a6
JB		 1018 if (family == AF_INET && dev->vn4_sock &&
1019 atomic_read(&dev->vn4_sock->refcnt) == 1)
95ab0991 1020 return false;
b1be00a6
JB		 1021#if IS_ENABLED(CONFIG_IPV6)
1022 if (family == AF_INET6 && dev->vn6_sock &&
1023 atomic_read(&dev->vn6_sock->refcnt) == 1)
1024 return false;
1025#endif
95ab0991 1026
553675fb 1027 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
95ab0991 1028 if (!netif_running(vxlan->dev) || vxlan == dev)
553675fb 1029 continue;
d342894c 1030
b1be00a6 1031 if (family == AF_INET && vxlan->vn4_sock != dev->vn4_sock)
95ab0991 1032 continue;
b1be00a6
JB		 1033#if IS_ENABLED(CONFIG_IPV6)
1034 if (family == AF_INET6 && vxlan->vn6_sock != dev->vn6_sock)
1035 continue;
1036#endif
95ab0991
G		 1037
1038 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1039 &dev->default_dst.remote_ip))
1040 continue;
1041
1042 if (vxlan->default_dst.remote_ifindex !=
1043 dev->default_dst.remote_ifindex)
1044 continue;
1045
1046 return true;
553675fb 1047 }
d342894c 1048
1049 return false;
1050}
1051
b1be00a6 1052static void __vxlan_sock_release(struct vxlan_sock *vs)
7c47cedf 1053{
b1be00a6 1054 struct vxlan_net *vn;
012a5729 1055
b1be00a6
JB		 1056 if (!vs)
1057 return;
7c47cedf
SH		 1058 if (!atomic_dec_and_test(&vs->refcnt))
1059 return;
d342894c 1060
b1be00a6 1061 vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1c51a915 1062 spin_lock(&vn->sock_lock);
7c47cedf 1063 hlist_del_rcu(&vs->hlist);
dc01e7d3 1064 vxlan_notify_del_rx_port(vs);
1c51a915
SH		 1065 spin_unlock(&vn->sock_lock);
1066
7c47cedf 1067 queue_work(vxlan_wq, &vs->del_work);
d342894c 1068}
1069
b1be00a6
JB		 1070static void vxlan_sock_release(struct vxlan_dev *vxlan)
1071{
1072 __vxlan_sock_release(vxlan->vn4_sock);
1073#if IS_ENABLED(CONFIG_IPV6)
1074 __vxlan_sock_release(vxlan->vn6_sock);
1075#endif
1076}
1077
56ef9c90 1078/* Update multicast group membership when first VNI on
c4b49512 1079 * multicast address is brought up
7c47cedf 1080 */
56ef9c90 1081static int vxlan_igmp_join(struct vxlan_dev *vxlan)
d342894c 1082{
b1be00a6 1083 struct sock *sk;
e4c7ed41
CW		 1084 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1085 int ifindex = vxlan->default_dst.remote_ifindex;
149d7549 1086 int ret = -EINVAL;
d342894c 1087
e4c7ed41
CW		 1088 if (ip->sa.sa_family == AF_INET) {
1089 struct ip_mreqn mreq = {
1090 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1091 .imr_ifindex = ifindex,
1092 };
1093
b1be00a6
JB		 1094 sk = vxlan->vn4_sock->sock->sk;
1095 lock_sock(sk);
56ef9c90 1096 ret = ip_mc_join_group(sk, &mreq);
b1be00a6 1097 release_sock(sk);
e4c7ed41
CW		 1098#if IS_ENABLED(CONFIG_IPV6)
1099 } else {
b1be00a6
JB		 1100 sk = vxlan->vn6_sock->sock->sk;
1101 lock_sock(sk);
56ef9c90
MRL		 1102 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1103 &ip->sin6.sin6_addr);
b1be00a6 1104 release_sock(sk);
e4c7ed41
CW		 1105#endif
1106 }
3fc2de2f 1107
56ef9c90 1108 return ret;
3fc2de2f 1109}
1110
1111/* Inverse of vxlan_igmp_join when last VNI is brought down */
56ef9c90 1112static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
3fc2de2f 1113{
b1be00a6 1114 struct sock *sk;
e4c7ed41
CW		 1115 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1116 int ifindex = vxlan->default_dst.remote_ifindex;
149d7549 1117 int ret = -EINVAL;
3fc2de2f 1118
e4c7ed41
CW		 1119 if (ip->sa.sa_family == AF_INET) {
1120 struct ip_mreqn mreq = {
1121 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1122 .imr_ifindex = ifindex,
1123 };
1124
b1be00a6
JB		 1125 sk = vxlan->vn4_sock->sock->sk;
1126 lock_sock(sk);
56ef9c90 1127 ret = ip_mc_leave_group(sk, &mreq);
b1be00a6 1128 release_sock(sk);
e4c7ed41
CW		 1129#if IS_ENABLED(CONFIG_IPV6)
1130 } else {
b1be00a6
JB		 1131 sk = vxlan->vn6_sock->sock->sk;
1132 lock_sock(sk);
56ef9c90
MRL		 1133 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1134 &ip->sin6.sin6_addr);
b1be00a6 1135 release_sock(sk);
e4c7ed41
CW		 1136#endif
1137 }
d342894c 1138
56ef9c90 1139 return ret;
d342894c 1140}
1141
f14ecebb
JB		 1142static bool vxlan_remcsum(struct vxlanhdr *unparsed,
1143 struct sk_buff *skb, u32 vxflags)
dfd8645e
TH		 1144{
1145 size_t start, offset, plen;
dfd8645e 1146
f14ecebb
JB		 1147 if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
1148 goto out;
b7fe10e5 1149
f14ecebb
JB		 1150 start = vxlan_rco_start(unparsed->vx_vni);
1151 offset = start + vxlan_rco_offset(unparsed->vx_vni);
dfd8645e 1152
be5cfeab 1153 plen = sizeof(struct vxlanhdr) + offset + sizeof(u16);
dfd8645e
TH		 1154
1155 if (!pskb_may_pull(skb, plen))
be5cfeab 1156 return false;
dfd8645e 1157
be5cfeab
JB		 1158 skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
1159 !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL));
f14ecebb
JB		 1160out:
1161 unparsed->vx_flags &= ~VXLAN_HF_RCO;
1162 unparsed->vx_vni &= VXLAN_VNI_MASK;
be5cfeab 1163 return true;
dfd8645e
TH		 1164}
1165
f14ecebb
JB		 1166static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
1167 struct vxlan_metadata *md,
3288af08
JB		 1168 struct metadata_dst *tun_dst)
1169{
f14ecebb
JB		 1170 struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
1171
1172 if (!(unparsed->vx_flags & VXLAN_HF_GBP))
1173 goto out;
3288af08 1174
3288af08
JB		 1175 md->gbp = ntohs(gbp->policy_id);
1176
1177 if (tun_dst)
1178 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1179
1180 if (gbp->dont_learn)
1181 md->gbp |= VXLAN_GBP_DONT_LEARN;
1182
1183 if (gbp->policy_applied)
1184 md->gbp |= VXLAN_GBP_POLICY_APPLIED;
f14ecebb
JB		 1185
1186out:
1187 unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
3288af08
JB		 1188}
1189
c9e78efb
JB		 1190static void vxlan_rcv(struct vxlan_dev *vxlan, struct vxlan_sock *vs,
1191 struct sk_buff *skb, struct vxlan_metadata *md,
614732ea
TG		 1192 struct metadata_dst *tun_dst)
1193{
1194 struct iphdr *oip = NULL;
1195 struct ipv6hdr *oip6 = NULL;
614732ea
TG		 1196 struct pcpu_sw_netstats *stats;
1197 union vxlan_addr saddr;
1198 int err = 0;
614732ea 1199
614732ea
TG		 1200 skb_reset_mac_header(skb);
1201 skb_scrub_packet(skb, !net_eq(vxlan->net, dev_net(vxlan->dev)));
1202 skb->protocol = eth_type_trans(skb, vxlan->dev);
1203 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1204
1205 /* Ignore packet loops (and multicast echo) */
1206 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1207 goto drop;
1208
ce212d0f
JB		 1209 /* Get data from the outer IP header */
1210 if (vxlan_get_sk_family(vs) == AF_INET) {
614732ea
TG		 1211 oip = ip_hdr(skb);
1212 saddr.sin.sin_addr.s_addr = oip->saddr;
1213 saddr.sa.sa_family = AF_INET;
1214#if IS_ENABLED(CONFIG_IPV6)
1215 } else {
1216 oip6 = ipv6_hdr(skb);
1217 saddr.sin6.sin6_addr = oip6->saddr;
1218 saddr.sa.sa_family = AF_INET6;
1219#endif
1220 }
1221
1222 if (tun_dst) {
1223 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1224 tun_dst = NULL;
1225 }
1226
1227 if ((vxlan->flags & VXLAN_F_LEARN) &&
1228 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
1229 goto drop;
1230
1231 skb_reset_network_header(skb);
1232 /* In flow-based mode, GBP is carried in dst_metadata */
da8b43c0 1233 if (!(vs->flags & VXLAN_F_COLLECT_METADATA))
614732ea
TG		 1234 skb->mark = md->gbp;
1235
1236 if (oip6)
1237 err = IP6_ECN_decapsulate(oip6, skb);
1238 if (oip)
1239 err = IP_ECN_decapsulate(oip, skb);
1240
1241 if (unlikely(err)) {
1242 if (log_ecn_error) {
1243 if (oip6)
1244 net_info_ratelimited("non-ECT from %pI6\n",
1245 &oip6->saddr);
1246 if (oip)
1247 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1248 &oip->saddr, oip->tos);
1249 }
1250 if (err > 1) {
1251 ++vxlan->dev->stats.rx_frame_errors;
1252 ++vxlan->dev->stats.rx_errors;
1253 goto drop;
1254 }
1255 }
1256
1257 stats = this_cpu_ptr(vxlan->dev->tstats);
1258 u64_stats_update_begin(&stats->syncp);
1259 stats->rx_packets++;
1260 stats->rx_bytes += skb->len;
1261 u64_stats_update_end(&stats->syncp);
1262
58ce31cc 1263 gro_cells_receive(&vxlan->gro_cells, skb);
614732ea
TG		 1264
1265 return;
1266drop:
1267 if (tun_dst)
1268 dst_release((struct dst_entry *)tun_dst);
1269
1270 /* Consume bad packet */
1271 kfree_skb(skb);
1272}
1273
d342894c 1274/* Callback from net/ipv4/udp.c to receive packets */
1275static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
1276{
ee122c79 1277 struct metadata_dst *tun_dst = NULL;
c9e78efb 1278 struct vxlan_dev *vxlan;
5cfccc5a 1279 struct vxlan_sock *vs;
f14ecebb 1280 struct vxlanhdr unparsed;
ee122c79
TG		 1281 struct vxlan_metadata _md;
1282 struct vxlan_metadata *md = &_md;
d342894c 1283
d342894c 1284 /* Need Vxlan and inner Ethernet header to be present */
7ce04758 1285 if (!pskb_may_pull(skb, VXLAN_HLEN))
288b01c8 1286 return 1;
d342894c 1287
f14ecebb 1288 unparsed = *vxlan_hdr(skb);
288b01c8
JB		 1289 /* VNI flag always required to be set */
1290 if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
1291 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1292 ntohl(vxlan_hdr(skb)->vx_flags),
1293 ntohl(vxlan_hdr(skb)->vx_vni));
1294 /* Return non vxlan pkt */
1295 return 1;
d342894c 1296 }
288b01c8
JB		 1297 unparsed.vx_flags &= ~VXLAN_HF_VNI;
1298 unparsed.vx_vni &= ~VXLAN_VNI_MASK;
d342894c 1299
559835ea 1300 vs = rcu_dereference_sk_user_data(sk);
5cfccc5a 1301 if (!vs)
d342894c 1302 goto drop;
d342894c 1303
c9e78efb
JB		 1304 vxlan = vxlan_vs_find_vni(vs, vxlan_vni(vxlan_hdr(skb)->vx_vni));
1305 if (!vxlan)
1306 goto drop;
1307
1308 if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB)))
1309 goto drop;
1310
ee122c79 1311 if (vxlan_collect_metadata(vs)) {
07dabf20
JB		 1312 __be32 vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
1313
c29a70d2 1314 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
07dabf20 1315 vxlan_vni_to_tun_id(vni), sizeof(*md));
c29a70d2 1316
ee122c79
TG		 1317 if (!tun_dst)
1318 goto drop;
1319
0f1b7354 1320 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
ee122c79
TG		 1321 } else {
1322 memset(md, 0, sizeof(*md));
1323 }
1324
3511494c
TG		 1325 /* For backwards compatibility, only allow reserved fields to be
1326 * used by VXLAN extensions if explicitly requested.
1327 */
f14ecebb
JB		 1328 if (vs->flags & VXLAN_F_REMCSUM_RX)
1329 if (!vxlan_remcsum(&unparsed, skb, vs->flags))
1330 goto drop;
1331 if (vs->flags & VXLAN_F_GBP)
1332 vxlan_parse_gbp_hdr(&unparsed, md, tun_dst);
3511494c 1333
f14ecebb 1334 if (unparsed.vx_flags || unparsed.vx_vni) {
3bf39475
TH		 1335 /* If there are any unprocessed flags remaining treat
1336 * this as a malformed packet. This behavior diverges from
1337 * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1338 * in reserved fields are to be ignored. The approach here
c4b49512 1339 * maintains compatibility with previous stack code, and also
3bf39475
TH		 1340 * is more robust and provides a little more security in
1341 * adding extensions to VXLAN.
1342 */
288b01c8 1343 goto drop;
3bf39475
TH		 1344 }
1345
c9e78efb 1346 vxlan_rcv(vxlan, vs, skb, md, tun_dst);
5cfccc5a
PS		 1347 return 0;
1348
1349drop:
ee122c79
TG		 1350 if (tun_dst)
1351 dst_release((struct dst_entry *)tun_dst);
1352
288b01c8
JB		 1353 /* Consume bad packet */
1354 kfree_skb(skb);
1355 return 0;
5cfccc5a
PS		 1356}
1357
e4f67add
DS		 1358static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1359{
1360 struct vxlan_dev *vxlan = netdev_priv(dev);
1361 struct arphdr *parp;
1362 u8 *arpptr, *sha;
1363 __be32 sip, tip;
1364 struct neighbour *n;
1365
1366 if (dev->flags & IFF_NOARP)
1367 goto out;
1368
1369 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1370 dev->stats.tx_dropped++;
1371 goto out;
1372 }
1373 parp = arp_hdr(skb);
1374
1375 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1376 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1377 parp->ar_pro != htons(ETH_P_IP) ||
1378 parp->ar_op != htons(ARPOP_REQUEST) ||
1379 parp->ar_hln != dev->addr_len ||
1380 parp->ar_pln != 4)
1381 goto out;
1382 arpptr = (u8 *)parp + sizeof(struct arphdr);
1383 sha = arpptr;
1384 arpptr += dev->addr_len; /* sha */
1385 memcpy(&sip, arpptr, sizeof(sip));
1386 arpptr += sizeof(sip);
1387 arpptr += dev->addr_len; /* tha */
1388 memcpy(&tip, arpptr, sizeof(tip));
1389
1390 if (ipv4_is_loopback(tip) ||
1391 ipv4_is_multicast(tip))
1392 goto out;
1393
1394 n = neigh_lookup(&arp_tbl, &tip, dev);
1395
1396 if (n) {
e4f67add
DS		 1397 struct vxlan_fdb *f;
1398 struct sk_buff *reply;
1399
1400 if (!(n->nud_state & NUD_CONNECTED)) {
1401 neigh_release(n);
1402 goto out;
1403 }
1404
1405 f = vxlan_find_mac(vxlan, n->ha);
e4c7ed41 1406 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
e4f67add
DS		 1407 /* bridge-local neighbor */
1408 neigh_release(n);
1409 goto out;
1410 }
1411
1412 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1413 n->ha, sha);
1414
1415 neigh_release(n);
1416
7346135d
DS		 1417 if (reply == NULL)
1418 goto out;
1419
e4f67add
DS		 1420 skb_reset_mac_header(reply);
1421 __skb_pull(reply, skb_network_offset(reply));
1422 reply->ip_summed = CHECKSUM_UNNECESSARY;
1423 reply->pkt_type = PACKET_HOST;
1424
1425 if (netif_rx_ni(reply) == NET_RX_DROP)
1426 dev->stats.rx_dropped++;
e4c7ed41
CW		 1427 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1428 union vxlan_addr ipa = {
1429 .sin.sin_addr.s_addr = tip,
a45e92a5 1430 .sin.sin_family = AF_INET,
e4c7ed41
CW		 1431 };
1432
1433 vxlan_ip_miss(dev, &ipa);
1434 }
e4f67add
DS		 1435out:
1436 consume_skb(skb);
1437 return NETDEV_TX_OK;
1438}
1439
f564f45c 1440#if IS_ENABLED(CONFIG_IPV6)
4b29dba9
DS		 1441static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1442 struct neighbour *n, bool isrouter)
1443{
1444 struct net_device *dev = request->dev;
1445 struct sk_buff *reply;
1446 struct nd_msg *ns, *na;
1447 struct ipv6hdr *pip6;
1448 u8 *daddr;
1449 int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1450 int ns_olen;
1451 int i, len;
1452
1453 if (dev == NULL)
1454 return NULL;
1455
1456 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1457 sizeof(*na) + na_olen + dev->needed_tailroom;
1458 reply = alloc_skb(len, GFP_ATOMIC);
1459 if (reply == NULL)
1460 return NULL;
1461
1462 reply->protocol = htons(ETH_P_IPV6);
1463 reply->dev = dev;
1464 skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1465 skb_push(reply, sizeof(struct ethhdr));
1466 skb_set_mac_header(reply, 0);
1467
1468 ns = (struct nd_msg *)skb_transport_header(request);
1469
1470 daddr = eth_hdr(request)->h_source;
1471 ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
1472 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1473 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1474 daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1475 break;
1476 }
1477 }
1478
1479 /* Ethernet header */
1480 ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1481 ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1482 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1483 reply->protocol = htons(ETH_P_IPV6);
1484
1485 skb_pull(reply, sizeof(struct ethhdr));
1486 skb_set_network_header(reply, 0);
1487 skb_put(reply, sizeof(struct ipv6hdr));
1488
1489 /* IPv6 header */
1490
1491 pip6 = ipv6_hdr(reply);
1492 memset(pip6, 0, sizeof(struct ipv6hdr));
1493 pip6->version = 6;
1494 pip6->priority = ipv6_hdr(request)->priority;
1495 pip6->nexthdr = IPPROTO_ICMPV6;
1496 pip6->hop_limit = 255;
1497 pip6->daddr = ipv6_hdr(request)->saddr;
1498 pip6->saddr = *(struct in6_addr *)n->primary_key;
1499
1500 skb_pull(reply, sizeof(struct ipv6hdr));
1501 skb_set_transport_header(reply, 0);
1502
1503 na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1504
1505 /* Neighbor Advertisement */
1506 memset(na, 0, sizeof(*na)+na_olen);
1507 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1508 na->icmph.icmp6_router = isrouter;
1509 na->icmph.icmp6_override = 1;
1510 na->icmph.icmp6_solicited = 1;
1511 na->target = ns->target;
1512 ether_addr_copy(&na->opt[2], n->ha);
1513 na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1514 na->opt[1] = na_olen >> 3;
1515
1516 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1517 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1518 csum_partial(na, sizeof(*na)+na_olen, 0));
1519
1520 pip6->payload_len = htons(sizeof(*na)+na_olen);
1521
1522 skb_push(reply, sizeof(struct ipv6hdr));
1523
1524 reply->ip_summed = CHECKSUM_UNNECESSARY;
1525
1526 return reply;
1527}
1528
f564f45c
CW		 1529static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1530{
1531 struct vxlan_dev *vxlan = netdev_priv(dev);
4b29dba9 1532 struct nd_msg *msg;
f564f45c
CW		 1533 const struct ipv6hdr *iphdr;
1534 const struct in6_addr *saddr, *daddr;
4b29dba9
DS		 1535 struct neighbour *n;
1536 struct inet6_dev *in6_dev;
f564f45c
CW		 1537
1538 in6_dev = __in6_dev_get(dev);
1539 if (!in6_dev)
1540 goto out;
1541
f564f45c
CW		 1542 iphdr = ipv6_hdr(skb);
1543 saddr = &iphdr->saddr;
1544 daddr = &iphdr->daddr;
1545
f564f45c
CW		 1546 msg = (struct nd_msg *)skb_transport_header(skb);
1547 if (msg->icmph.icmp6_code != 0 ||
1548 msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1549 goto out;
1550
4b29dba9
DS		 1551 if (ipv6_addr_loopback(daddr) ||
1552 ipv6_addr_is_multicast(&msg->target))
1553 goto out;
1554
1555 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
f564f45c
CW		 1556
1557 if (n) {
1558 struct vxlan_fdb *f;
4b29dba9 1559 struct sk_buff *reply;
f564f45c
CW		 1560
1561 if (!(n->nud_state & NUD_CONNECTED)) {
1562 neigh_release(n);
1563 goto out;
1564 }
1565
1566 f = vxlan_find_mac(vxlan, n->ha);
1567 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1568 /* bridge-local neighbor */
1569 neigh_release(n);
1570 goto out;
1571 }
1572
4b29dba9
DS		 1573 reply = vxlan_na_create(skb, n,
1574 !!(f ? f->flags & NTF_ROUTER : 0));
1575
f564f45c 1576 neigh_release(n);
4b29dba9
DS		 1577
1578 if (reply == NULL)
1579 goto out;
1580
1581 if (netif_rx_ni(reply) == NET_RX_DROP)
1582 dev->stats.rx_dropped++;
1583
f564f45c 1584 } else if (vxlan->flags & VXLAN_F_L3MISS) {
4b29dba9
DS		 1585 union vxlan_addr ipa = {
1586 .sin6.sin6_addr = msg->target,
a45e92a5 1587 .sin6.sin6_family = AF_INET6,
4b29dba9
DS		 1588 };
1589
f564f45c
CW		 1590 vxlan_ip_miss(dev, &ipa);
1591 }
1592
1593out:
1594 consume_skb(skb);
1595 return NETDEV_TX_OK;
1596}
1597#endif
1598
e4f67add
DS		 1599static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1600{
1601 struct vxlan_dev *vxlan = netdev_priv(dev);
1602 struct neighbour *n;
e4f67add
DS		 1603
1604 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1605 return false;
1606
1607 n = NULL;
1608 switch (ntohs(eth_hdr(skb)->h_proto)) {
1609 case ETH_P_IP:
e15a00aa
CW		 1610 {
1611 struct iphdr *pip;
1612
e4f67add
DS		 1613 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1614 return false;
1615 pip = ip_hdr(skb);
1616 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
e4c7ed41
CW		 1617 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1618 union vxlan_addr ipa = {
1619 .sin.sin_addr.s_addr = pip->daddr,
a45e92a5 1620 .sin.sin_family = AF_INET,
e4c7ed41
CW		 1621 };
1622
1623 vxlan_ip_miss(dev, &ipa);
1624 return false;
1625 }
1626
e4f67add 1627 break;
e15a00aa
CW		 1628 }
1629#if IS_ENABLED(CONFIG_IPV6)
1630 case ETH_P_IPV6:
1631 {
1632 struct ipv6hdr *pip6;
1633
1634 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1635 return false;
1636 pip6 = ipv6_hdr(skb);
1637 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1638 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1639 union vxlan_addr ipa = {
1640 .sin6.sin6_addr = pip6->daddr,
a45e92a5 1641 .sin6.sin6_family = AF_INET6,
e15a00aa
CW		 1642 };
1643
1644 vxlan_ip_miss(dev, &ipa);
1645 return false;
1646 }
1647
1648 break;
1649 }
1650#endif
e4f67add
DS		 1651 default:
1652 return false;
1653 }
1654
1655 if (n) {
1656 bool diff;
1657
7367d0b5 1658 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
e4f67add
DS		 1659 if (diff) {
1660 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1661 dev->addr_len);
1662 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1663 }
1664 neigh_release(n);
1665 return diff;
e4c7ed41
CW		 1666 }
1667
e4f67add
DS		 1668 return false;
1669}
1670
af33c1ad 1671static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
3511494c
TG		 1672 struct vxlan_metadata *md)
1673{
1674 struct vxlanhdr_gbp *gbp;
1675
db79a621
TG		 1676 if (!md->gbp)
1677 return;
1678
3511494c 1679 gbp = (struct vxlanhdr_gbp *)vxh;
54bfd872 1680 vxh->vx_flags |= VXLAN_HF_GBP;
3511494c
TG		 1681
1682 if (md->gbp & VXLAN_GBP_DONT_LEARN)
1683 gbp->dont_learn = 1;
1684
1685 if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1686 gbp->policy_applied = 1;
1687
1688 gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1689}
1690
f491e56d
JB		 1691static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
1692 int iphdr_len, __be32 vni,
1693 struct vxlan_metadata *md, u32 vxflags,
b4ed5cad 1694 bool udp_sum)
e4c7ed41 1695{
e4c7ed41 1696 struct vxlanhdr *vxh;
e4c7ed41
CW		 1697 int min_headroom;
1698 int err;
dfd8645e 1699 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
dfd8645e 1700
af33c1ad 1701 if ((vxflags & VXLAN_F_REMCSUM_TX) &&
dfd8645e
TH		 1702 skb->ip_summed == CHECKSUM_PARTIAL) {
1703 int csum_start = skb_checksum_start_offset(skb);
1704
1705 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1706 !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1707 (skb->csum_offset == offsetof(struct udphdr, check) ||
b5708501 1708 skb->csum_offset == offsetof(struct tcphdr, check)))
dfd8645e 1709 type |= SKB_GSO_TUNNEL_REMCSUM;
dfd8645e 1710 }
e4c7ed41 1711
e4c7ed41 1712 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
f491e56d 1713 + VXLAN_HLEN + iphdr_len
df8a39de 1714 + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
649c5b8b
PS		 1715
1716 /* Need space for new headers (invalidates iph ptr) */
1717 err = skb_cow_head(skb, min_headroom);
74f47278
PS		 1718 if (unlikely(err)) {
1719 kfree_skb(skb);
649c5b8b 1720 return err;
74f47278 1721 }
649c5b8b 1722
5968250c
JP		 1723 skb = vlan_hwaccel_push_inside(skb);
1724 if (WARN_ON(!skb))
1725 return -ENOMEM;
1eaa8178 1726
6fa79666 1727 skb = iptunnel_handle_offloads(skb, type);
b736a623
JG		 1728 if (IS_ERR(skb))
1729 return PTR_ERR(skb);
1730
49560532 1731 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
54bfd872
JB		 1732 vxh->vx_flags = VXLAN_HF_VNI;
1733 vxh->vx_vni = vxlan_vni_field(vni);
49560532 1734
dfd8645e 1735 if (type & SKB_GSO_TUNNEL_REMCSUM) {
54bfd872 1736 unsigned int start;
dfd8645e 1737
54bfd872
JB		 1738 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
1739 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
1740 vxh->vx_flags |= VXLAN_HF_RCO;
dfd8645e
TH		 1741
1742 if (!skb_is_gso(skb)) {
1743 skb->ip_summed = CHECKSUM_NONE;
1744 skb->encapsulation = 0;
1745 }
1746 }
1747
af33c1ad
TH		 1748 if (vxflags & VXLAN_F_GBP)
1749 vxlan_build_gbp_hdr(vxh, vxflags, md);
3511494c 1750
996c9fd1 1751 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
039f5062 1752 return 0;
49560532 1753}
49560532 1754
1a8496ba
JB		 1755static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan,
1756 struct sk_buff *skb, int oif, u8 tos,
0c1d70af
PA		 1757 __be32 daddr, __be32 *saddr,
1758 struct dst_cache *dst_cache,
1759 struct ip_tunnel_info *info)
1a8496ba
JB		 1760{
1761 struct rtable *rt = NULL;
0c1d70af 1762 bool use_cache = false;
1a8496ba
JB		 1763 struct flowi4 fl4;
1764
0c1d70af
PA		 1765 /* when the ip_tunnel_info is availble, the tos used for lookup is
1766 * packet independent, so we can use the cache
1767 */
d71785ff 1768 if (!skb->mark && (!tos || info)) {
0c1d70af
PA		 1769 use_cache = true;
1770 rt = dst_cache_get_ip4(dst_cache, saddr);
1771 if (rt)
1772 return rt;
1773 }
1774
1a8496ba
JB		 1775 memset(&fl4, 0, sizeof(fl4));
1776 fl4.flowi4_oif = oif;
1777 fl4.flowi4_tos = RT_TOS(tos);
1778 fl4.flowi4_mark = skb->mark;
1779 fl4.flowi4_proto = IPPROTO_UDP;
1780 fl4.daddr = daddr;
1781 fl4.saddr = vxlan->cfg.saddr.sin.sin_addr.s_addr;
1782
1783 rt = ip_route_output_key(vxlan->net, &fl4);
0c1d70af 1784 if (!IS_ERR(rt)) {
1a8496ba 1785 *saddr = fl4.saddr;
0c1d70af
PA		 1786 if (use_cache)
1787 dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
1788 }
1a8496ba
JB		 1789 return rt;
1790}
1791
e5d4b29f
JB		 1792#if IS_ENABLED(CONFIG_IPV6)
1793static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
1794 struct sk_buff *skb, int oif,
1795 const struct in6_addr *daddr,
0c1d70af
PA		 1796 struct in6_addr *saddr,
1797 struct dst_cache *dst_cache)
e5d4b29f
JB		 1798{
1799 struct dst_entry *ndst;
1800 struct flowi6 fl6;
1801 int err;
1802
d71785ff 1803 if (!skb->mark) {
0c1d70af
PA		 1804 ndst = dst_cache_get_ip6(dst_cache, saddr);
1805 if (ndst)
1806 return ndst;
1807 }
1808
e5d4b29f
JB		 1809 memset(&fl6, 0, sizeof(fl6));
1810 fl6.flowi6_oif = oif;
1811 fl6.daddr = *daddr;
1812 fl6.saddr = vxlan->cfg.saddr.sin6.sin6_addr;
1813 fl6.flowi6_mark = skb->mark;
1814 fl6.flowi6_proto = IPPROTO_UDP;
1815
1816 err = ipv6_stub->ipv6_dst_lookup(vxlan->net,
1817 vxlan->vn6_sock->sock->sk,
1818 &ndst, &fl6);
1819 if (err < 0)
1820 return ERR_PTR(err);
1821
1822 *saddr = fl6.saddr;
d71785ff 1823 if (!skb->mark)
0c1d70af 1824 dst_cache_set_ip6(dst_cache, ndst, saddr);
e5d4b29f
JB		 1825 return ndst;
1826}
1827#endif
1828
9dcc71e1
SS		 1829/* Bypass encapsulation if the destination is local */
1830static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1831 struct vxlan_dev *dst_vxlan)
1832{
8f84985f 1833 struct pcpu_sw_netstats *tx_stats, *rx_stats;
e4c7ed41
CW		 1834 union vxlan_addr loopback;
1835 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
ce6502a8
LR		 1836 struct net_device *dev = skb->dev;
1837 int len = skb->len;
9dcc71e1 1838
8f84985f
LR		 1839 tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1840 rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
9dcc71e1
SS		 1841 skb->pkt_type = PACKET_HOST;
1842 skb->encapsulation = 0;
1843 skb->dev = dst_vxlan->dev;
1844 __skb_pull(skb, skb_network_offset(skb));
1845
e4c7ed41
CW		 1846 if (remote_ip->sa.sa_family == AF_INET) {
1847 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1848 loopback.sa.sa_family = AF_INET;
1849#if IS_ENABLED(CONFIG_IPV6)
1850 } else {
1851 loopback.sin6.sin6_addr = in6addr_loopback;
1852 loopback.sa.sa_family = AF_INET6;
1853#endif
1854 }
1855
9dcc71e1 1856 if (dst_vxlan->flags & VXLAN_F_LEARN)
e4c7ed41 1857 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
9dcc71e1
SS		 1858
1859 u64_stats_update_begin(&tx_stats->syncp);
1860 tx_stats->tx_packets++;
ce6502a8 1861 tx_stats->tx_bytes += len;
9dcc71e1
SS		 1862 u64_stats_update_end(&tx_stats->syncp);
1863
1864 if (netif_rx(skb) == NET_RX_SUCCESS) {
1865 u64_stats_update_begin(&rx_stats->syncp);
1866 rx_stats->rx_packets++;
ce6502a8 1867 rx_stats->rx_bytes += len;
9dcc71e1
SS		 1868 u64_stats_update_end(&rx_stats->syncp);
1869 } else {
ce6502a8 1870 dev->stats.rx_dropped++;
9dcc71e1
SS		 1871 }
1872}
1873
4ad16930
SH		 1874static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1875 struct vxlan_rdst *rdst, bool did_rsc)
d342894c 1876{
d71785ff 1877 struct dst_cache *dst_cache;
3093fbe7 1878 struct ip_tunnel_info *info;
d342894c 1879 struct vxlan_dev *vxlan = netdev_priv(dev);
b1be00a6 1880 struct sock *sk;
e4c7ed41 1881 struct rtable *rt = NULL;
d342894c 1882 const struct iphdr *old_iph;
e4c7ed41 1883 union vxlan_addr *dst;
ee122c79
TG		 1884 union vxlan_addr remote_ip;
1885 struct vxlan_metadata _md;
1886 struct vxlan_metadata *md = &_md;
e4c7ed41 1887 __be16 src_port = 0, dst_port;
54bfd872 1888 __be32 vni;
d342894c 1889 __be16 df = 0;
1890 __u8 tos, ttl;
0e6fbc5b 1891 int err;
ee122c79 1892 u32 flags = vxlan->flags;
b4ed5cad 1893 bool udp_sum = false;
f491e56d 1894 bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
d342894c 1895
61adedf3 1896 info = skb_tunnel_info(skb);
3093fbe7 1897
ee122c79 1898 if (rdst) {
0dfbdf41 1899 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
ee122c79
TG		 1900 vni = rdst->remote_vni;
1901 dst = &rdst->remote_ip;
d71785ff 1902 dst_cache = &rdst->dst_cache;
ee122c79
TG		 1903 } else {
1904 if (!info) {
1905 WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
1906 dev->name);
1907 goto drop;
1908 }
0dfbdf41 1909 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
54bfd872 1910 vni = vxlan_tun_id_to_vni(info->key.tun_id);
b1be00a6
JB		 1911 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
1912 if (remote_ip.sa.sa_family == AF_INET)
a725e514
JB		 1913 remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
1914 else
1915 remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
ee122c79 1916 dst = &remote_ip;
d71785ff 1917 dst_cache = &info->dst_cache;
ee122c79 1918 }
e4f67add 1919
e4c7ed41 1920 if (vxlan_addr_any(dst)) {
e4f67add 1921 if (did_rsc) {
e4f67add 1922 /* short-circuited back to local bridge */
9dcc71e1 1923 vxlan_encap_bypass(skb, vxlan, vxlan);
4ad16930 1924 return;
e4f67add 1925 }
ef59febe 1926 goto drop;
e4f67add 1927 }
ef59febe 1928
d342894c 1929 old_iph = ip_hdr(skb);
1930
0dfbdf41 1931 ttl = vxlan->cfg.ttl;
e4c7ed41 1932 if (!ttl && vxlan_addr_multicast(dst))
d342894c 1933 ttl = 1;
1934
0dfbdf41 1935 tos = vxlan->cfg.tos;
d342894c 1936 if (tos == 1)
206aaafc 1937 tos = ip_tunnel_get_dsfield(old_iph, skb);
d342894c 1938
0dfbdf41
TG		 1939 src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
1940 vxlan->cfg.port_max, true);
d342894c 1941
a725e514 1942 if (info) {
a725e514
JB		 1943 ttl = info->key.ttl;
1944 tos = info->key.tos;
b4ed5cad 1945 udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
a725e514
JB		 1946
1947 if (info->options_len)
4c222798 1948 md = ip_tunnel_info_opts(info);
a725e514
JB		 1949 } else {
1950 md->gbp = skb->mark;
1951 }
1952
e4c7ed41 1953 if (dst->sa.sa_family == AF_INET) {
1a8496ba
JB		 1954 __be32 saddr;
1955
b1be00a6
JB		 1956 if (!vxlan->vn4_sock)
1957 goto drop;
1958 sk = vxlan->vn4_sock->sock->sk;
1959
35e2d115
JG		 1960 if (info) {
1961 if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT)
1962 df = htons(IP_DF);
b4ed5cad
JB		 1963 } else {
1964 udp_sum = !!(flags & VXLAN_F_UDP_CSUM);
35e2d115 1965 }
ee122c79 1966
1a8496ba
JB		 1967 rt = vxlan_get_route(vxlan, skb,
1968 rdst ? rdst->remote_ifindex : 0, tos,
0c1d70af 1969 dst->sin.sin_addr.s_addr, &saddr,
d71785ff 1970 dst_cache, info);
e4c7ed41
CW		 1971 if (IS_ERR(rt)) {
1972 netdev_dbg(dev, "no route to %pI4\n",
1973 &dst->sin.sin_addr.s_addr);
1974 dev->stats.tx_carrier_errors++;
1975 goto tx_error;
1976 }
d342894c 1977
e4c7ed41
CW		 1978 if (rt->dst.dev == dev) {
1979 netdev_dbg(dev, "circular route to %pI4\n",
1980 &dst->sin.sin_addr.s_addr);
1981 dev->stats.collisions++;
fffc15a5 1982 goto rt_tx_error;
e4c7ed41
CW		 1983 }
1984
1985 /* Bypass encapsulation if the destination is local */
1986 if (rt->rt_flags & RTCF_LOCAL &&
1987 !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1988 struct vxlan_dev *dst_vxlan;
1989
1990 ip_rt_put(rt);
19ca9fc1 1991 dst_vxlan = vxlan_find_vni(vxlan->net, vni,
ac5132d1
TG		 1992 dst->sa.sa_family, dst_port,
1993 vxlan->flags);
e4c7ed41
CW		 1994 if (!dst_vxlan)
1995 goto tx_error;
1996 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1997 return;
1998 }
1999
2000 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2001 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
f491e56d 2002 err = vxlan_build_skb(skb, &rt->dst, sizeof(struct iphdr),
54bfd872 2003 vni, md, flags, udp_sum);
f491e56d
JB		 2004 if (err < 0)
2005 goto xmit_tx_error;
2006
2007 udp_tunnel_xmit_skb(rt, sk, skb, saddr,
2008 dst->sin.sin_addr.s_addr, tos, ttl, df,
2009 src_port, dst_port, xnet, !udp_sum);
e4c7ed41
CW		 2010#if IS_ENABLED(CONFIG_IPV6)
2011 } else {
e4c7ed41 2012 struct dst_entry *ndst;
e5d4b29f 2013 struct in6_addr saddr;
6f264e47 2014 u32 rt6i_flags;
e4c7ed41 2015
b1be00a6
JB		 2016 if (!vxlan->vn6_sock)
2017 goto drop;
2018 sk = vxlan->vn6_sock->sock->sk;
2019
e5d4b29f
JB		 2020 ndst = vxlan6_get_route(vxlan, skb,
2021 rdst ? rdst->remote_ifindex : 0,
0c1d70af 2022 &dst->sin6.sin6_addr, &saddr,
d71785ff 2023 dst_cache);
e5d4b29f 2024 if (IS_ERR(ndst)) {
e4c7ed41
CW		 2025 netdev_dbg(dev, "no route to %pI6\n",
2026 &dst->sin6.sin6_addr);
2027 dev->stats.tx_carrier_errors++;
9dcc71e1 2028 goto tx_error;
e4c7ed41 2029 }
d342894c 2030
e4c7ed41
CW		 2031 if (ndst->dev == dev) {
2032 netdev_dbg(dev, "circular route to %pI6\n",
2033 &dst->sin6.sin6_addr);
2034 dst_release(ndst);
2035 dev->stats.collisions++;
2036 goto tx_error;
2037 }
0e6fbc5b 2038
e4c7ed41 2039 /* Bypass encapsulation if the destination is local */
6f264e47
JB		 2040 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2041 if (rt6i_flags & RTF_LOCAL &&
2042 !(rt6i_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
e4c7ed41
CW		 2043 struct vxlan_dev *dst_vxlan;
2044
2045 dst_release(ndst);
19ca9fc1 2046 dst_vxlan = vxlan_find_vni(vxlan->net, vni,
ac5132d1
TG		 2047 dst->sa.sa_family, dst_port,
2048 vxlan->flags);
e4c7ed41
CW		 2049 if (!dst_vxlan)
2050 goto tx_error;
2051 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2052 return;
2053 }
49560532 2054
b4ed5cad
JB		 2055 if (!info)
2056 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
35e2d115 2057
e4c7ed41 2058 ttl = ttl ? : ip6_dst_hoplimit(ndst);
f491e56d
JB		 2059 skb_scrub_packet(skb, xnet);
2060 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
54bfd872 2061 vni, md, flags, udp_sum);
f491e56d
JB		 2062 if (err < 0) {
2063 dst_release(ndst);
2064 return;
2065 }
2066 udp_tunnel6_xmit_skb(ndst, sk, skb, dev,
2067 &saddr, &dst->sin6.sin6_addr,
2068 0, ttl, src_port, dst_port, !udp_sum);
e4c7ed41
CW		 2069#endif
2070 }
0e6fbc5b 2071
4ad16930 2072 return;
d342894c 2073
2074drop:
2075 dev->stats.tx_dropped++;
2076 goto tx_free;
2077
f491e56d
JB		 2078xmit_tx_error:
2079 /* skb is already freed. */
2080 skb = NULL;
49560532
PS		 2081rt_tx_error:
2082 ip_rt_put(rt);
d342894c 2083tx_error:
2084 dev->stats.tx_errors++;
2085tx_free:
2086 dev_kfree_skb(skb);
d342894c 2087}
2088
6681712d
DS		 2089/* Transmit local packets over Vxlan
2090 *
2091 * Outer IP header inherits ECN and DF from inner header.
2092 * Outer UDP destination is the VXLAN assigned port.
2093 * source port is based on hash of flow
2094 */
2095static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2096{
2097 struct vxlan_dev *vxlan = netdev_priv(dev);
3093fbe7 2098 const struct ip_tunnel_info *info;
6681712d
DS		 2099 struct ethhdr *eth;
2100 bool did_rsc = false;
8f646c92 2101 struct vxlan_rdst *rdst, *fdst = NULL;
6681712d 2102 struct vxlan_fdb *f;
6681712d 2103
61adedf3 2104 info = skb_tunnel_info(skb);
3093fbe7 2105
6681712d
DS		 2106 skb_reset_mac_header(skb);
2107 eth = eth_hdr(skb);
2108
f564f45c
CW		 2109 if ((vxlan->flags & VXLAN_F_PROXY)) {
2110 if (ntohs(eth->h_proto) == ETH_P_ARP)
2111 return arp_reduce(dev, skb);
2112#if IS_ENABLED(CONFIG_IPV6)
2113 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
91269e39
LR		 2114 pskb_may_pull(skb, sizeof(struct ipv6hdr)
2115 + sizeof(struct nd_msg)) &&
f564f45c
CW		 2116 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2117 struct nd_msg *msg;
2118
2119 msg = (struct nd_msg *)skb_transport_header(skb);
2120 if (msg->icmph.icmp6_code == 0 &&
2121 msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2122 return neigh_reduce(dev, skb);
2123 }
7a9f526f 2124 eth = eth_hdr(skb);
f564f45c
CW		 2125#endif
2126 }
6681712d 2127
da8b43c0 2128 if (vxlan->flags & VXLAN_F_COLLECT_METADATA &&
46fa062a 2129 info && info->mode & IP_TUNNEL_INFO_TX) {
ee122c79
TG		 2130 vxlan_xmit_one(skb, dev, NULL, false);
2131 return NETDEV_TX_OK;
2132 }
2133
6681712d 2134 f = vxlan_find_mac(vxlan, eth->h_dest);
ae884082
DS		 2135 did_rsc = false;
2136
2137 if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
e15a00aa
CW		 2138 (ntohs(eth->h_proto) == ETH_P_IP ||
2139 ntohs(eth->h_proto) == ETH_P_IPV6)) {
ae884082
DS		 2140 did_rsc = route_shortcircuit(dev, skb);
2141 if (did_rsc)
2142 f = vxlan_find_mac(vxlan, eth->h_dest);
2143 }
2144
6681712d 2145 if (f == NULL) {
afbd8bae
MR		 2146 f = vxlan_find_mac(vxlan, all_zeros_mac);
2147 if (f == NULL) {
2148 if ((vxlan->flags & VXLAN_F_L2MISS) &&
2149 !is_multicast_ether_addr(eth->h_dest))
2150 vxlan_fdb_miss(vxlan, eth->h_dest);
2151
2152 dev->stats.tx_dropped++;
8f646c92 2153 kfree_skb(skb);
afbd8bae
MR		 2154 return NETDEV_TX_OK;
2155 }
2156 }
6681712d 2157
afbd8bae
MR		 2158 list_for_each_entry_rcu(rdst, &f->remotes, list) {
2159 struct sk_buff *skb1;
6681712d 2160
8f646c92
ED		 2161 if (!fdst) {
2162 fdst = rdst;
2163 continue;
2164 }
afbd8bae
MR		 2165 skb1 = skb_clone(skb, GFP_ATOMIC);
2166 if (skb1)
2167 vxlan_xmit_one(skb1, dev, rdst, did_rsc);
6681712d
DS		 2168 }
2169
8f646c92
ED		 2170 if (fdst)
2171 vxlan_xmit_one(skb, dev, fdst, did_rsc);
2172 else
2173 kfree_skb(skb);
4ad16930 2174 return NETDEV_TX_OK;
6681712d
DS		 2175}
2176
d342894c 2177/* Walk the forwarding table and purge stale entries */
2178static void vxlan_cleanup(unsigned long arg)
2179{
2180 struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
2181 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2182 unsigned int h;
2183
2184 if (!netif_running(vxlan->dev))
2185 return;
2186
d342894c 2187 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2188 struct hlist_node *p, *n;
14e1d0fa
SD		 2189
2190 spin_lock_bh(&vxlan->hash_lock);
d342894c 2191 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2192 struct vxlan_fdb *f
2193 = container_of(p, struct vxlan_fdb, hlist);
2194 unsigned long timeout;
2195
3c172868 2196 if (f->state & NUD_PERMANENT)
d342894c 2197 continue;
2198
0dfbdf41 2199 timeout = f->used + vxlan->cfg.age_interval * HZ;
d342894c 2200 if (time_before_eq(timeout, jiffies)) {
2201 netdev_dbg(vxlan->dev,
2202 "garbage collect %pM\n",
2203 f->eth_addr);
2204 f->state = NUD_STALE;
2205 vxlan_fdb_destroy(vxlan, f);
2206 } else if (time_before(timeout, next_timer))
2207 next_timer = timeout;
2208 }
14e1d0fa 2209 spin_unlock_bh(&vxlan->hash_lock);
d342894c 2210 }
d342894c 2211
2212 mod_timer(&vxlan->age_timer, next_timer);
2213}
2214
9c2e24e1
PS		 2215static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
2216{
56ef9c90 2217 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
54bfd872 2218 __be32 vni = vxlan->default_dst.remote_vni;
9c2e24e1 2219
56ef9c90 2220 spin_lock(&vn->sock_lock);
9c2e24e1 2221 hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
56ef9c90 2222 spin_unlock(&vn->sock_lock);
9c2e24e1
PS		 2223}
2224
d342894c 2225/* Setup stats when device is created */
2226static int vxlan_init(struct net_device *dev)
2227{
1c213bd2 2228 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
e8171045 2229 if (!dev->tstats)
d342894c 2230 return -ENOMEM;
2231
2232 return 0;
2233}
2234
ba609e9b 2235static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
afbd8bae
MR		 2236{
2237 struct vxlan_fdb *f;
2238
2239 spin_lock_bh(&vxlan->hash_lock);
2240 f = __vxlan_find_mac(vxlan, all_zeros_mac);
2241 if (f)
2242 vxlan_fdb_destroy(vxlan, f);
2243 spin_unlock_bh(&vxlan->hash_lock);
2244}
2245
ebf4063e
SH		 2246static void vxlan_uninit(struct net_device *dev)
2247{
2248 struct vxlan_dev *vxlan = netdev_priv(dev);
ebf4063e 2249
ba609e9b 2250 vxlan_fdb_delete_default(vxlan);
afbd8bae 2251
ebf4063e
SH		 2252 free_percpu(dev->tstats);
2253}
2254
d342894c 2255/* Start ageing timer and join group when device is brought up */
2256static int vxlan_open(struct net_device *dev)
2257{
2258 struct vxlan_dev *vxlan = netdev_priv(dev);
205f356d 2259 int ret;
56ef9c90 2260
205f356d
JB		 2261 ret = vxlan_sock_add(vxlan);
2262 if (ret < 0)
2263 return ret;
d342894c 2264
79d4a94f 2265 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
56ef9c90 2266 ret = vxlan_igmp_join(vxlan);
bef0057b
MRL		 2267 if (ret == -EADDRINUSE)
2268 ret = 0;
56ef9c90 2269 if (ret) {
205f356d 2270 vxlan_sock_release(vxlan);
56ef9c90
MRL		 2271 return ret;
2272 }
d342894c 2273 }
2274
0dfbdf41 2275 if (vxlan->cfg.age_interval)
d342894c 2276 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2277
56ef9c90 2278 return ret;
d342894c 2279}
2280
2281/* Purge the forwarding table */
2282static void vxlan_flush(struct vxlan_dev *vxlan)
2283{
31fec5aa 2284 unsigned int h;
d342894c 2285
2286 spin_lock_bh(&vxlan->hash_lock);
2287 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2288 struct hlist_node *p, *n;
2289 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2290 struct vxlan_fdb *f
2291 = container_of(p, struct vxlan_fdb, hlist);
afbd8bae
MR		 2292 /* the all_zeros_mac entry is deleted at vxlan_uninit */
2293 if (!is_zero_ether_addr(f->eth_addr))
2294 vxlan_fdb_destroy(vxlan, f);
d342894c 2295 }
2296 }
2297 spin_unlock_bh(&vxlan->hash_lock);
2298}
2299
2300/* Cleanup timer and forwarding table on shutdown */
2301static int vxlan_stop(struct net_device *dev)
2302{
2303 struct vxlan_dev *vxlan = netdev_priv(dev);
f01ec1c0 2304 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
56ef9c90 2305 int ret = 0;
d342894c 2306
24c0e683 2307 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
f13b1689 2308 !vxlan_group_used(vn, vxlan))
56ef9c90 2309 ret = vxlan_igmp_leave(vxlan);
d342894c 2310
2311 del_timer_sync(&vxlan->age_timer);
2312
2313 vxlan_flush(vxlan);
205f356d 2314 vxlan_sock_release(vxlan);
d342894c 2315
56ef9c90 2316 return ret;
d342894c 2317}
2318
d342894c 2319/* Stub, nothing needs to be done. */
2320static void vxlan_set_multicast_list(struct net_device *dev)
2321{
2322}
2323
345010b5
DB		 2324static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2325{
2326 struct vxlan_dev *vxlan = netdev_priv(dev);
2327 struct vxlan_rdst *dst = &vxlan->default_dst;
2328 struct net_device *lowerdev;
2329 int max_mtu;
2330
f01ec1c0 2331 lowerdev = __dev_get_by_index(vxlan->net, dst->remote_ifindex);
345010b5
DB		 2332 if (lowerdev == NULL)
2333 return eth_change_mtu(dev, new_mtu);
2334
2335 if (dst->remote_ip.sa.sa_family == AF_INET6)
2336 max_mtu = lowerdev->mtu - VXLAN6_HEADROOM;
2337 else
2338 max_mtu = lowerdev->mtu - VXLAN_HEADROOM;
2339
2340 if (new_mtu < 68 || new_mtu > max_mtu)
2341 return -EINVAL;
2342
2343 dev->mtu = new_mtu;
2344 return 0;
2345}
2346
fc4099f1
PS		 2347static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
2348{
2349 struct vxlan_dev *vxlan = netdev_priv(dev);
2350 struct ip_tunnel_info *info = skb_tunnel_info(skb);
2351 __be16 sport, dport;
2352
2353 sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2354 vxlan->cfg.port_max, true);
2355 dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
2356
239e944f 2357 if (ip_tunnel_info_af(info) == AF_INET) {
1a8496ba
JB		 2358 struct rtable *rt;
2359
239e944f
JB		 2360 if (!vxlan->vn4_sock)
2361 return -EINVAL;
1a8496ba
JB		 2362 rt = vxlan_get_route(vxlan, skb, 0, info->key.tos,
2363 info->key.u.ipv4.dst,
0c1d70af 2364 &info->key.u.ipv4.src, NULL, info);
1a8496ba
JB		 2365 if (IS_ERR(rt))
2366 return PTR_ERR(rt);
2367 ip_rt_put(rt);
239e944f
JB		 2368 } else {
2369#if IS_ENABLED(CONFIG_IPV6)
2370 struct dst_entry *ndst;
2371
2372 if (!vxlan->vn6_sock)
2373 return -EINVAL;
2374 ndst = vxlan6_get_route(vxlan, skb, 0,
2375 &info->key.u.ipv6.dst,
0c1d70af 2376 &info->key.u.ipv6.src, NULL);
239e944f
JB		 2377 if (IS_ERR(ndst))
2378 return PTR_ERR(ndst);
2379 dst_release(ndst);
239e944f
JB		 2380#else /* !CONFIG_IPV6 */
2381 return -EPFNOSUPPORT;
2382#endif
2383 }
1a8496ba
JB		 2384 info->key.tp_src = sport;
2385 info->key.tp_dst = dport;
239e944f 2386 return 0;
fc4099f1
PS		 2387}
2388
d342894c 2389static const struct net_device_ops vxlan_netdev_ops = {
2390 .ndo_init = vxlan_init,
ebf4063e 2391 .ndo_uninit = vxlan_uninit,
d342894c 2392 .ndo_open = vxlan_open,
2393 .ndo_stop = vxlan_stop,
2394 .ndo_start_xmit = vxlan_xmit,
e8171045 2395 .ndo_get_stats64 = ip_tunnel_get_stats64,
d342894c 2396 .ndo_set_rx_mode = vxlan_set_multicast_list,
345010b5 2397 .ndo_change_mtu = vxlan_change_mtu,
d342894c 2398 .ndo_validate_addr = eth_validate_addr,
2399 .ndo_set_mac_address = eth_mac_addr,
2400 .ndo_fdb_add = vxlan_fdb_add,
2401 .ndo_fdb_del = vxlan_fdb_delete,
2402 .ndo_fdb_dump = vxlan_fdb_dump,
fc4099f1 2403 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
d342894c 2404};
2405
2406/* Info for udev, that this is a virtual tunnel endpoint */
2407static struct device_type vxlan_type = {
2408 .name = "vxlan",
2409};
2410
53cf5275 2411/* Calls the ndo_add_vxlan_port of the caller in order to
35e42379
JG		 2412 * supply the listening VXLAN udp ports. Callers are expected
2413 * to implement the ndo_add_vxlan_port.
53cf5275
JG		 2414 */
2415void vxlan_get_rx_port(struct net_device *dev)
2416{
2417 struct vxlan_sock *vs;
2418 struct net *net = dev_net(dev);
2419 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2420 sa_family_t sa_family;
35e42379
JG		 2421 __be16 port;
2422 unsigned int i;
53cf5275
JG		 2423
2424 spin_lock(&vn->sock_lock);
2425 for (i = 0; i < PORT_HASH_SIZE; ++i) {
35e42379
JG		 2426 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2427 port = inet_sk(vs->sock->sk)->inet_sport;
705cc62f 2428 sa_family = vxlan_get_sk_family(vs);
53cf5275
JG		 2429 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
2430 port);
2431 }
2432 }
2433 spin_unlock(&vn->sock_lock);
2434}
2435EXPORT_SYMBOL_GPL(vxlan_get_rx_port);
2436
d342894c 2437/* Initialize the device structure. */
2438static void vxlan_setup(struct net_device *dev)
2439{
2440 struct vxlan_dev *vxlan = netdev_priv(dev);
31fec5aa 2441 unsigned int h;
d342894c 2442
2443 eth_hw_addr_random(dev);
2444 ether_setup(dev);
2445
2446 dev->netdev_ops = &vxlan_netdev_ops;
ebf4063e 2447 dev->destructor = free_netdev;
d342894c 2448 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2449
d342894c 2450 dev->features |= NETIF_F_LLTX;
d6727fe3 2451 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
0afb1666 2452 dev->features |= NETIF_F_RXCSUM;
05c0db08 2453 dev->features |= NETIF_F_GSO_SOFTWARE;
0afb1666 2454
1eaa8178
PS		 2455 dev->vlan_features = dev->features;
2456 dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
0afb1666 2457 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
05c0db08 2458 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1eaa8178 2459 dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
02875878 2460 netif_keep_dst(dev);
22dba393 2461 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
d342894c 2462
553675fb 2463 INIT_LIST_HEAD(&vxlan->next);
d342894c 2464 spin_lock_init(&vxlan->hash_lock);
2465
2466 init_timer_deferrable(&vxlan->age_timer);
2467 vxlan->age_timer.function = vxlan_cleanup;
2468 vxlan->age_timer.data = (unsigned long) vxlan;
2469
0dfbdf41 2470 vxlan->cfg.dst_port = htons(vxlan_port);
05f47d69 2471
d342894c 2472 vxlan->dev = dev;
2473
58ce31cc
TH		 2474 gro_cells_init(&vxlan->gro_cells, dev);
2475
d342894c 2476 for (h = 0; h < FDB_HASH_SIZE; ++h)
2477 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2478}
2479
2480static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2481 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
5d174dd8 2482 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
e4c7ed41 2483 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
d342894c 2484 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
2485 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
e4c7ed41 2486 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
d342894c 2487 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
2488 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
2489 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
2490 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
2491 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
05f47d69 2492 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
e4f67add
DS		 2493 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
2494 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
2495 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
2496 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
f8a9b1bc 2497 [IFLA_VXLAN_COLLECT_METADATA] = { .type = NLA_U8 },
823aa873 2498 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
5c91ae08
TH		 2499 [IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 },
2500 [IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
2501 [IFLA_VXLAN_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
dfd8645e
TH		 2502 [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2503 [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
3511494c 2504 [IFLA_VXLAN_GBP] = { .type = NLA_FLAG, },
0ace2ca8 2505 [IFLA_VXLAN_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG },
d342894c 2506};
2507
2508static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2509{
2510 if (tb[IFLA_ADDRESS]) {
2511 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2512 pr_debug("invalid link address (not ethernet)\n");
2513 return -EINVAL;
2514 }
2515
2516 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2517 pr_debug("invalid all zero ethernet address\n");
2518 return -EADDRNOTAVAIL;
2519 }
2520 }
2521
2522 if (!data)
2523 return -EINVAL;
2524
2525 if (data[IFLA_VXLAN_ID]) {
2526 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2527 if (id >= VXLAN_VID_MASK)
2528 return -ERANGE;
2529 }
2530
05f47d69 2531 if (data[IFLA_VXLAN_PORT_RANGE]) {
2532 const struct ifla_vxlan_port_range *p
2533 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2534
2535 if (ntohs(p->high) < ntohs(p->low)) {
2536 pr_debug("port range %u .. %u not valid\n",
2537 ntohs(p->low), ntohs(p->high));
2538 return -EINVAL;
2539 }
2540 }
2541
d342894c 2542 return 0;
2543}
2544
1b13c97f
YB		 2545static void vxlan_get_drvinfo(struct net_device *netdev,
2546 struct ethtool_drvinfo *drvinfo)
2547{
2548 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2549 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2550}
2551
2552static const struct ethtool_ops vxlan_ethtool_ops = {
2553 .get_drvinfo = vxlan_get_drvinfo,
2554 .get_link = ethtool_op_get_link,
2555};
2556
553675fb 2557static void vxlan_del_work(struct work_struct *work)
2558{
2559 struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
acbf74a7 2560 udp_tunnel_sock_release(vs->sock);
553675fb 2561 kfree_rcu(vs, rcu);
2562}
2563
3ee64f39
TH		 2564static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2565 __be16 port, u32 flags)
553675fb 2566{
e4c7ed41 2567 struct socket *sock;
3ee64f39
TH		 2568 struct udp_port_cfg udp_conf;
2569 int err;
e4c7ed41 2570
3ee64f39 2571 memset(&udp_conf, 0, sizeof(udp_conf));
e4c7ed41 2572
3ee64f39
TH		 2573 if (ipv6) {
2574 udp_conf.family = AF_INET6;
3ee64f39 2575 udp_conf.use_udp6_rx_checksums =
3dc2b6a8 2576 !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
a43a9ef6 2577 udp_conf.ipv6_v6only = 1;
3ee64f39
TH		 2578 } else {
2579 udp_conf.family = AF_INET;
e4c7ed41 2580 }
e4c7ed41 2581
3ee64f39 2582 udp_conf.local_udp_port = port;
553675fb 2583
3ee64f39
TH		 2584 /* Open UDP socket */
2585 err = udp_sock_create(net, &udp_conf, &sock);
2586 if (err < 0)
2587 return ERR_PTR(err);
e4c7ed41 2588
39deb2c7 2589 return sock;
e4c7ed41
CW		 2590}
2591
2592/* Create new listen socket if needed */
b1be00a6
JB		 2593static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
2594 __be16 port, u32 flags)
e4c7ed41
CW		 2595{
2596 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2597 struct vxlan_sock *vs;
2598 struct socket *sock;
e4c7ed41 2599 unsigned int h;
acbf74a7 2600 struct udp_tunnel_sock_cfg tunnel_cfg;
e4c7ed41 2601
dc01e7d3 2602 vs = kzalloc(sizeof(*vs), GFP_KERNEL);
e4c7ed41
CW		 2603 if (!vs)
2604 return ERR_PTR(-ENOMEM);
2605
2606 for (h = 0; h < VNI_HASH_SIZE; ++h)
2607 INIT_HLIST_HEAD(&vs->vni_list[h]);
2608
2609 INIT_WORK(&vs->del_work, vxlan_del_work);
2610
3ee64f39 2611 sock = vxlan_create_sock(net, ipv6, port, flags);
39deb2c7 2612 if (IS_ERR(sock)) {
56ef9c90
MRL		 2613 pr_info("Cannot bind port %d, err=%ld\n", ntohs(port),
2614 PTR_ERR(sock));
553675fb 2615 kfree(vs);
e50fddc8 2616 return ERR_CAST(sock);
553675fb 2617 }
e4c7ed41
CW		 2618
2619 vs->sock = sock;
9c2e24e1 2620 atomic_set(&vs->refcnt, 1);
af33c1ad 2621 vs->flags = (flags & VXLAN_F_RCV_FLAGS);
553675fb 2622
dc01e7d3
OG		 2623 /* Initialize the vxlan udp offloads structure */
2624 vs->udp_offloads.port = port;
2625 vs->udp_offloads.callbacks.gro_receive = vxlan_gro_receive;
2626 vs->udp_offloads.callbacks.gro_complete = vxlan_gro_complete;
2627
9c2e24e1
PS		 2628 spin_lock(&vn->sock_lock);
2629 hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
dc01e7d3 2630 vxlan_notify_add_rx_port(vs);
9c2e24e1 2631 spin_unlock(&vn->sock_lock);
553675fb 2632
2633 /* Mark socket as an encapsulation socket. */
acbf74a7
AZ		 2634 tunnel_cfg.sk_user_data = vs;
2635 tunnel_cfg.encap_type = 1;
2636 tunnel_cfg.encap_rcv = vxlan_udp_encap_recv;
2637 tunnel_cfg.encap_destroy = NULL;
2638
2639 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
e4c7ed41 2640
9c2e24e1
PS		 2641 return vs;
2642}
2643
b1be00a6 2644static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
9c2e24e1 2645{
205f356d
JB		 2646 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2647 struct vxlan_sock *vs = NULL;
9c2e24e1 2648
205f356d 2649 if (!vxlan->cfg.no_share) {
56ef9c90 2650 spin_lock(&vn->sock_lock);
205f356d
JB		 2651 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
2652 vxlan->cfg.dst_port, vxlan->flags);
2653 if (vs && !atomic_add_unless(&vs->refcnt, 1, 0)) {
56ef9c90 2654 spin_unlock(&vn->sock_lock);
205f356d 2655 return -EBUSY;
56ef9c90
MRL		 2656 }
2657 spin_unlock(&vn->sock_lock);
2658 }
205f356d 2659 if (!vs)
b1be00a6
JB		 2660 vs = vxlan_socket_create(vxlan->net, ipv6,
2661 vxlan->cfg.dst_port, vxlan->flags);
205f356d
JB		 2662 if (IS_ERR(vs))
2663 return PTR_ERR(vs);
b1be00a6
JB		 2664#if IS_ENABLED(CONFIG_IPV6)
2665 if (ipv6)
2666 vxlan->vn6_sock = vs;
2667 else
2668#endif
2669 vxlan->vn4_sock = vs;
205f356d
JB		 2670 vxlan_vs_add_dev(vs, vxlan);
2671 return 0;
553675fb 2672}
2673
b1be00a6
JB		 2674static int vxlan_sock_add(struct vxlan_dev *vxlan)
2675{
2676 bool ipv6 = vxlan->flags & VXLAN_F_IPV6;
2677 bool metadata = vxlan->flags & VXLAN_F_COLLECT_METADATA;
2678 int ret = 0;
2679
2680 vxlan->vn4_sock = NULL;
2681#if IS_ENABLED(CONFIG_IPV6)
2682 vxlan->vn6_sock = NULL;
2683 if (ipv6 || metadata)
2684 ret = __vxlan_sock_add(vxlan, true);
2685#endif
2686 if (!ret && (!ipv6 || metadata))
2687 ret = __vxlan_sock_add(vxlan, false);
2688 if (ret < 0)
2689 vxlan_sock_release(vxlan);
2690 return ret;
2691}
2692
0dfbdf41
TG		 2693static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
2694 struct vxlan_config *conf)
d342894c 2695{
33564bbb 2696 struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
07b9b37c 2697 struct vxlan_dev *vxlan = netdev_priv(dev), *tmp;
c7995c43 2698 struct vxlan_rdst *dst = &vxlan->default_dst;
b1be00a6 2699 unsigned short needed_headroom = ETH_HLEN;
d342894c 2700 int err;
e4c7ed41 2701 bool use_ipv6 = false;
0dfbdf41 2702 __be16 default_port = vxlan->cfg.dst_port;
d342894c 2703
33564bbb 2704 vxlan->net = src_net;
f01ec1c0 2705
0dfbdf41 2706 dst->remote_vni = conf->vni;
d342894c 2707
0dfbdf41 2708 memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
d342894c 2709
0dfbdf41
TG		 2710 /* Unless IPv6 is explicitly requested, assume IPv4 */
2711 if (!dst->remote_ip.sa.sa_family)
2712 dst->remote_ip.sa.sa_family = AF_INET;
e4c7ed41 2713
0dfbdf41 2714 if (dst->remote_ip.sa.sa_family == AF_INET6 ||
057ba29b
JB		 2715 vxlan->cfg.saddr.sa.sa_family == AF_INET6) {
2716 if (!IS_ENABLED(CONFIG_IPV6))
2717 return -EPFNOSUPPORT;
e4c7ed41 2718 use_ipv6 = true;
b1be00a6 2719 vxlan->flags |= VXLAN_F_IPV6;
057ba29b 2720 }
d342894c 2721
0dfbdf41 2722 if (conf->remote_ifindex) {
34e02aa1 2723 struct net_device *lowerdev
0dfbdf41
TG		 2724 = __dev_get_by_index(src_net, conf->remote_ifindex);
2725
2726 dst->remote_ifindex = conf->remote_ifindex;
34e02aa1 2727
2728 if (!lowerdev) {
c7995c43 2729 pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
34e02aa1 2730 return -ENODEV;
2731 }
d342894c 2732
e4c7ed41
CW		 2733#if IS_ENABLED(CONFIG_IPV6)
2734 if (use_ipv6) {
2735 struct inet6_dev *idev = __in6_dev_get(lowerdev);
2736 if (idev && idev->cnf.disable_ipv6) {
2737 pr_info("IPv6 is disabled via sysctl\n");
2738 return -EPERM;
2739 }
e4c7ed41
CW		 2740 }
2741#endif
2742
0dfbdf41 2743 if (!conf->mtu)
e4c7ed41 2744 dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
1ba56fb4 2745
b1be00a6 2746 needed_headroom = lowerdev->hard_header_len;
9dc2ad10 2747 }
d342894c 2748
b1be00a6
JB		 2749 if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
2750 needed_headroom += VXLAN6_HEADROOM;
2751 else
2752 needed_headroom += VXLAN_HEADROOM;
2753 dev->needed_headroom = needed_headroom;
2754
0dfbdf41
TG		 2755 memcpy(&vxlan->cfg, conf, sizeof(*conf));
2756 if (!vxlan->cfg.dst_port)
2757 vxlan->cfg.dst_port = default_port;
2758 vxlan->flags |= conf->flags;
2759
2760 if (!vxlan->cfg.age_interval)
2761 vxlan->cfg.age_interval = FDB_AGE_DEFAULT;
2762
07b9b37c
ND		 2763 list_for_each_entry(tmp, &vn->vxlan_list, next) {
2764 if (tmp->cfg.vni == conf->vni &&
2765 (tmp->default_dst.remote_ip.sa.sa_family == AF_INET6 ||
2766 tmp->cfg.saddr.sa.sa_family == AF_INET6) == use_ipv6 &&
2767 tmp->cfg.dst_port == vxlan->cfg.dst_port &&
2768 (tmp->flags & VXLAN_F_RCV_FLAGS) ==
2769 (vxlan->flags & VXLAN_F_RCV_FLAGS))
0dfbdf41 2770 return -EEXIST;
07b9b37c 2771 }
0dfbdf41
TG		 2772
2773 dev->ethtool_ops = &vxlan_ethtool_ops;
2774
2775 /* create an fdb entry for a valid default destination */
2776 if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2777 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2778 &vxlan->default_dst.remote_ip,
2779 NUD_REACHABLE|NUD_PERMANENT,
2780 NLM_F_EXCL|NLM_F_CREATE,
2781 vxlan->cfg.dst_port,
2782 vxlan->default_dst.remote_vni,
2783 vxlan->default_dst.remote_ifindex,
2784 NTF_SELF);
2785 if (err)
2786 return err;
2787 }
2788
2789 err = register_netdevice(dev);
2790 if (err) {
2791 vxlan_fdb_delete_default(vxlan);
2792 return err;
2793 }
2794
2795 list_add(&vxlan->next, &vn->vxlan_list);
2796
2797 return 0;
2798}
2799
2800struct net_device *vxlan_dev_create(struct net *net, const char *name,
2801 u8 name_assign_type, struct vxlan_config *conf)
2802{
2803 struct nlattr *tb[IFLA_MAX+1];
2804 struct net_device *dev;
2805 int err;
2806
2807 memset(&tb, 0, sizeof(tb));
2808
2809 dev = rtnl_create_link(net, name, name_assign_type,
2810 &vxlan_link_ops, tb);
2811 if (IS_ERR(dev))
2812 return dev;
2813
2814 err = vxlan_dev_configure(net, dev, conf);
2815 if (err < 0) {
2816 free_netdev(dev);
2817 return ERR_PTR(err);
2818 }
2819
2820 return dev;
2821}
2822EXPORT_SYMBOL_GPL(vxlan_dev_create);
2823
2824static int vxlan_newlink(struct net *src_net, struct net_device *dev,
2825 struct nlattr *tb[], struct nlattr *data[])
2826{
2827 struct vxlan_config conf;
2828 int err;
2829
0dfbdf41 2830 memset(&conf, 0, sizeof(conf));
e277de5f
JG		 2831
2832 if (data[IFLA_VXLAN_ID])
54bfd872 2833 conf.vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
0dfbdf41
TG		 2834
2835 if (data[IFLA_VXLAN_GROUP]) {
2836 conf.remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
2837 } else if (data[IFLA_VXLAN_GROUP6]) {
2838 if (!IS_ENABLED(CONFIG_IPV6))
2839 return -EPFNOSUPPORT;
2840
2841 conf.remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
2842 conf.remote_ip.sa.sa_family = AF_INET6;
2843 }
2844
2845 if (data[IFLA_VXLAN_LOCAL]) {
2846 conf.saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
2847 conf.saddr.sa.sa_family = AF_INET;
2848 } else if (data[IFLA_VXLAN_LOCAL6]) {
2849 if (!IS_ENABLED(CONFIG_IPV6))
2850 return -EPFNOSUPPORT;
2851
2852 /* TODO: respect scope id */
2853 conf.saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
2854 conf.saddr.sa.sa_family = AF_INET6;
2855 }
2856
2857 if (data[IFLA_VXLAN_LINK])
2858 conf.remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
2859
d342894c 2860 if (data[IFLA_VXLAN_TOS])
0dfbdf41 2861 conf.tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
d342894c 2862
afb97186 2863 if (data[IFLA_VXLAN_TTL])
0dfbdf41 2864 conf.ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
afb97186 2865
d342894c 2866 if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
0dfbdf41 2867 conf.flags |= VXLAN_F_LEARN;
d342894c 2868
2869 if (data[IFLA_VXLAN_AGEING])
0dfbdf41 2870 conf.age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
d342894c 2871
e4f67add 2872 if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
0dfbdf41 2873 conf.flags |= VXLAN_F_PROXY;
e4f67add
DS		 2874
2875 if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
0dfbdf41 2876 conf.flags |= VXLAN_F_RSC;
e4f67add
DS		 2877
2878 if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
0dfbdf41 2879 conf.flags |= VXLAN_F_L2MISS;
e4f67add
DS		 2880
2881 if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
0dfbdf41 2882 conf.flags |= VXLAN_F_L3MISS;
e4f67add 2883
d342894c 2884 if (data[IFLA_VXLAN_LIMIT])
0dfbdf41 2885 conf.addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
d342894c 2886
f8a9b1bc
AS		 2887 if (data[IFLA_VXLAN_COLLECT_METADATA] &&
2888 nla_get_u8(data[IFLA_VXLAN_COLLECT_METADATA]))
2889 conf.flags |= VXLAN_F_COLLECT_METADATA;
2890
05f47d69 2891 if (data[IFLA_VXLAN_PORT_RANGE]) {
2892 const struct ifla_vxlan_port_range *p
2893 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
0dfbdf41
TG		 2894 conf.port_min = ntohs(p->low);
2895 conf.port_max = ntohs(p->high);
05f47d69 2896 }
2897
823aa873 2898 if (data[IFLA_VXLAN_PORT])
0dfbdf41 2899 conf.dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
823aa873 2900
359a0ea9 2901 if (data[IFLA_VXLAN_UDP_CSUM] && nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
0dfbdf41 2902 conf.flags |= VXLAN_F_UDP_CSUM;
359a0ea9
TH		 2903
2904 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
2905 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
0dfbdf41 2906 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
359a0ea9
TH		 2907
2908 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
2909 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
0dfbdf41 2910 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
359a0ea9 2911
dfd8645e
TH		 2912 if (data[IFLA_VXLAN_REMCSUM_TX] &&
2913 nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
0dfbdf41 2914 conf.flags |= VXLAN_F_REMCSUM_TX;
dfd8645e
TH		 2915
2916 if (data[IFLA_VXLAN_REMCSUM_RX] &&
2917 nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
0dfbdf41 2918 conf.flags |= VXLAN_F_REMCSUM_RX;
dfd8645e 2919
3511494c 2920 if (data[IFLA_VXLAN_GBP])
0dfbdf41 2921 conf.flags |= VXLAN_F_GBP;
3511494c 2922
0ace2ca8 2923 if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL])
0dfbdf41 2924 conf.flags |= VXLAN_F_REMCSUM_NOPARTIAL;
0ace2ca8 2925
0dfbdf41
TG		 2926 err = vxlan_dev_configure(src_net, dev, &conf);
2927 switch (err) {
2928 case -ENODEV:
2929 pr_info("ifindex %d does not exist\n", conf.remote_ifindex);
2930 break;
1b13c97f 2931
0dfbdf41
TG		 2932 case -EPERM:
2933 pr_info("IPv6 is disabled via sysctl\n");
2934 break;
d342894c 2935
0dfbdf41 2936 case -EEXIST:
54bfd872 2937 pr_info("duplicate VNI %u\n", be32_to_cpu(conf.vni));
0dfbdf41 2938 break;
afbd8bae
MR		 2939 }
2940
0dfbdf41 2941 return err;
d342894c 2942}
2943
2944static void vxlan_dellink(struct net_device *dev, struct list_head *head)
2945{
2946 struct vxlan_dev *vxlan = netdev_priv(dev);
f01ec1c0 2947 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
d342894c 2948
fe5c3561 2949 spin_lock(&vn->sock_lock);
9c2e24e1
PS		 2950 if (!hlist_unhashed(&vxlan->hlist))
2951 hlist_del_rcu(&vxlan->hlist);
fe5c3561 2952 spin_unlock(&vn->sock_lock);
2953
58ce31cc 2954 gro_cells_destroy(&vxlan->gro_cells);
553675fb 2955 list_del(&vxlan->next);
d342894c 2956 unregister_netdevice_queue(dev, head);
2957}
2958
2959static size_t vxlan_get_size(const struct net_device *dev)
2960{
2961
2962 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
e4c7ed41 2963 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
d342894c 2964 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
e4c7ed41 2965 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
d342894c 2966 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
2967 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
2968 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
e4f67add
DS		 2969 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
2970 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
2971 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
2972 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
da8b43c0 2973 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_COLLECT_METADATA */
d342894c 2974 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
2975 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
05f47d69 2976 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
359a0ea9
TH		 2977 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
2978 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
2979 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
2980 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
dfd8645e
TH		 2981 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
2982 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
d342894c 2983 0;
2984}
2985
2986static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
2987{
2988 const struct vxlan_dev *vxlan = netdev_priv(dev);
c7995c43 2989 const struct vxlan_rdst *dst = &vxlan->default_dst;
05f47d69 2990 struct ifla_vxlan_port_range ports = {
0dfbdf41
TG		 2991 .low = htons(vxlan->cfg.port_min),
2992 .high = htons(vxlan->cfg.port_max),
05f47d69 2993 };
d342894c 2994
54bfd872 2995 if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni)))
d342894c 2996 goto nla_put_failure;
2997
e4c7ed41
CW		 2998 if (!vxlan_addr_any(&dst->remote_ip)) {
2999 if (dst->remote_ip.sa.sa_family == AF_INET) {
930345ea
JB		 3000 if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
3001 dst->remote_ip.sin.sin_addr.s_addr))
e4c7ed41
CW		 3002 goto nla_put_failure;
3003#if IS_ENABLED(CONFIG_IPV6)
3004 } else {
930345ea
JB		 3005 if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
3006 &dst->remote_ip.sin6.sin6_addr))
e4c7ed41
CW		 3007 goto nla_put_failure;
3008#endif
3009 }
3010 }
d342894c 3011
c7995c43 3012 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
d342894c 3013 goto nla_put_failure;
3014
0dfbdf41
TG		 3015 if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
3016 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
930345ea 3017 if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
0dfbdf41 3018 vxlan->cfg.saddr.sin.sin_addr.s_addr))
e4c7ed41
CW		 3019 goto nla_put_failure;
3020#if IS_ENABLED(CONFIG_IPV6)
3021 } else {
930345ea 3022 if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
0dfbdf41 3023 &vxlan->cfg.saddr.sin6.sin6_addr))
e4c7ed41
CW		 3024 goto nla_put_failure;
3025#endif
3026 }
3027 }
d342894c 3028
0dfbdf41
TG		 3029 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
3030 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
e4f67add
DS		 3031 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
3032 !!(vxlan->flags & VXLAN_F_LEARN)) ||
3033 nla_put_u8(skb, IFLA_VXLAN_PROXY,
3034 !!(vxlan->flags & VXLAN_F_PROXY)) ||
3035 nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
3036 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
3037 !!(vxlan->flags & VXLAN_F_L2MISS)) ||
3038 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
3039 !!(vxlan->flags & VXLAN_F_L3MISS)) ||
da8b43c0
AS		 3040 nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
3041 !!(vxlan->flags & VXLAN_F_COLLECT_METADATA)) ||
0dfbdf41
TG		 3042 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
3043 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
3044 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
359a0ea9
TH		 3045 nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
3046 !!(vxlan->flags & VXLAN_F_UDP_CSUM)) ||
3047 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
3048 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
3049 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
dfd8645e
TH		 3050 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
3051 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
3052 !!(vxlan->flags & VXLAN_F_REMCSUM_TX)) ||
3053 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
3054 !!(vxlan->flags & VXLAN_F_REMCSUM_RX)))
d342894c 3055 goto nla_put_failure;
3056
05f47d69 3057 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
3058 goto nla_put_failure;
3059
3511494c
TG		 3060 if (vxlan->flags & VXLAN_F_GBP &&
3061 nla_put_flag(skb, IFLA_VXLAN_GBP))
3062 goto nla_put_failure;
3063
0ace2ca8
TH		 3064 if (vxlan->flags & VXLAN_F_REMCSUM_NOPARTIAL &&
3065 nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
3066 goto nla_put_failure;
3067
d342894c 3068 return 0;
3069
3070nla_put_failure:
3071 return -EMSGSIZE;
3072}
3073
1728d4fa
ND		 3074static struct net *vxlan_get_link_net(const struct net_device *dev)
3075{
3076 struct vxlan_dev *vxlan = netdev_priv(dev);
3077
3078 return vxlan->net;
3079}
3080
d342894c 3081static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
3082 .kind = "vxlan",
3083 .maxtype = IFLA_VXLAN_MAX,
3084 .policy = vxlan_policy,
3085 .priv_size = sizeof(struct vxlan_dev),
3086 .setup = vxlan_setup,
3087 .validate = vxlan_validate,
3088 .newlink = vxlan_newlink,
3089 .dellink = vxlan_dellink,
3090 .get_size = vxlan_get_size,
3091 .fill_info = vxlan_fill_info,
1728d4fa 3092 .get_link_net = vxlan_get_link_net,
d342894c 3093};
3094
acaf4e70
DB		 3095static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
3096 struct net_device *dev)
3097{
3098 struct vxlan_dev *vxlan, *next;
3099 LIST_HEAD(list_kill);
3100
3101 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3102 struct vxlan_rdst *dst = &vxlan->default_dst;
3103
3104 /* In case we created vxlan device with carrier
3105 * and we loose the carrier due to module unload
3106 * we also need to remove vxlan device. In other
3107 * cases, it's not necessary and remote_ifindex
3108 * is 0 here, so no matches.
3109 */
3110 if (dst->remote_ifindex == dev->ifindex)
3111 vxlan_dellink(vxlan->dev, &list_kill);
3112 }
3113
3114 unregister_netdevice_many(&list_kill);
3115}
3116
3117static int vxlan_lowerdev_event(struct notifier_block *unused,
3118 unsigned long event, void *ptr)
3119{
3120 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
783c1463 3121 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
acaf4e70 3122
783c1463 3123 if (event == NETDEV_UNREGISTER)
acaf4e70
DB		 3124 vxlan_handle_lowerdev_unregister(vn, dev);
3125
3126 return NOTIFY_DONE;
3127}
3128
3129static struct notifier_block vxlan_notifier_block __read_mostly = {
3130 .notifier_call = vxlan_lowerdev_event,
3131};
3132
d342894c 3133static __net_init int vxlan_init_net(struct net *net)
3134{
3135 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
31fec5aa 3136 unsigned int h;
d342894c 3137
553675fb 3138 INIT_LIST_HEAD(&vn->vxlan_list);
1c51a915 3139 spin_lock_init(&vn->sock_lock);
d342894c 3140
553675fb 3141 for (h = 0; h < PORT_HASH_SIZE; ++h)
3142 INIT_HLIST_HEAD(&vn->sock_list[h]);
d342894c 3143
3144 return 0;
3145}
3146
f01ec1c0
ND		 3147static void __net_exit vxlan_exit_net(struct net *net)
3148{
3149 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3150 struct vxlan_dev *vxlan, *next;
3151 struct net_device *dev, *aux;
3152 LIST_HEAD(list);
3153
3154 rtnl_lock();
3155 for_each_netdev_safe(net, dev, aux)
3156 if (dev->rtnl_link_ops == &vxlan_link_ops)
3157 unregister_netdevice_queue(dev, &list);
3158
3159 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3160 /* If vxlan->dev is in the same netns, it has already been added
3161 * to the list by the previous loop.
3162 */
58ce31cc
TH		 3163 if (!net_eq(dev_net(vxlan->dev), net)) {
3164 gro_cells_destroy(&vxlan->gro_cells);
13c3ed6a 3165 unregister_netdevice_queue(vxlan->dev, &list);
58ce31cc 3166 }
f01ec1c0
ND		 3167 }
3168
3169 unregister_netdevice_many(&list);
3170 rtnl_unlock();
3171}
3172
d342894c 3173static struct pernet_operations vxlan_net_ops = {
3174 .init = vxlan_init_net,
f01ec1c0 3175 .exit = vxlan_exit_net,
d342894c 3176 .id = &vxlan_net_id,
3177 .size = sizeof(struct vxlan_net),
3178};
3179
3180static int __init vxlan_init_module(void)
3181{
3182 int rc;
3183
758c57d1
SH		 3184 vxlan_wq = alloc_workqueue("vxlan", 0, 0);
3185 if (!vxlan_wq)
3186 return -ENOMEM;
3187
d342894c 3188 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
3189
783c1463 3190 rc = register_pernet_subsys(&vxlan_net_ops);
d342894c 3191 if (rc)
3192 goto out1;
3193
acaf4e70 3194 rc = register_netdevice_notifier(&vxlan_notifier_block);
d342894c 3195 if (rc)
3196 goto out2;
3197
acaf4e70
DB		 3198 rc = rtnl_link_register(&vxlan_link_ops);
3199 if (rc)
3200 goto out3;
d342894c 3201
acaf4e70
DB		 3202 return 0;
3203out3:
3204 unregister_netdevice_notifier(&vxlan_notifier_block);
d342894c 3205out2:
783c1463 3206 unregister_pernet_subsys(&vxlan_net_ops);
d342894c 3207out1:
758c57d1 3208 destroy_workqueue(vxlan_wq);
d342894c 3209 return rc;
3210}
7332a13b 3211late_initcall(vxlan_init_module);
d342894c 3212
3213static void __exit vxlan_cleanup_module(void)
3214{
b7153984 3215 rtnl_link_unregister(&vxlan_link_ops);
acaf4e70 3216 unregister_netdevice_notifier(&vxlan_notifier_block);
758c57d1 3217 destroy_workqueue(vxlan_wq);
783c1463
DB		 3218 unregister_pernet_subsys(&vxlan_net_ops);
3219 /* rcu_barrier() is called by netns */
d342894c 3220}
3221module_exit(vxlan_cleanup_module);
3222
3223MODULE_LICENSE("GPL");
3224MODULE_VERSION(VXLAN_VERSION);
3b8df3c6 3225MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
ead5139a 3226MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
d342894c 3227MODULE_ALIAS_RTNL_LINK("vxlan");
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