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Merge tag 'arm64-perf' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
[linux-2.6-block.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 for (p = *head; p; p = p->next) {
595 if (!NAPI_GRO_CB(p)->same_flow)
596 continue;
597
598 vh2 = (struct vxlanhdr *)(p->data + off_vx);
3511494c
TG		 599 if (vh->vx_flags != vh2->vx_flags ||
600 vh->vx_vni != vh2->vx_vni) {
dc01e7d3
OG		 601 NAPI_GRO_CB(p)->same_flow = 0;
602 continue;
603 }
dc01e7d3
OG		 604 }
605
9b174d88 606 pp = eth_gro_receive(head, skb);
c194cf93 607 flush = 0;
dc01e7d3 608
dc01e7d3 609out:
26c4f7da 610 skb_gro_remcsum_cleanup(skb, &grc);
dc01e7d3
OG		 611 NAPI_GRO_CB(skb)->flush |= flush;
612
613 return pp;
614}
615
a2b12f3c
TH		 616static int vxlan_gro_complete(struct sk_buff *skb, int nhoff,
617 struct udp_offload *uoff)
dc01e7d3 618{
229740c6
JR		 619 /* Sets 'skb->inner_mac_header' since we are always called with
620 * 'skb->encapsulation' set.
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);
472681d5
MM		 951 if (err < 0) {
952 cb->args[1] = err;
3e61aa8f 953 goto out;
472681d5 954 }
3e61aa8f 955skip:
07a51cd3
AW		 956 ++idx;
957 }
d342894c 958 }
959 }
3e61aa8f 960out:
d342894c 961 return idx;
962}
963
964/* Watch incoming packets to learn mapping between Ethernet address
965 * and Tunnel endpoint.
c4b49512 966 * Return true if packet is bogus and should be dropped.
d342894c 967 */
26a41ae6 968static bool vxlan_snoop(struct net_device *dev,
e4c7ed41 969 union vxlan_addr *src_ip, const u8 *src_mac)
d342894c 970{
971 struct vxlan_dev *vxlan = netdev_priv(dev);
972 struct vxlan_fdb *f;
d342894c 973
974 f = vxlan_find_mac(vxlan, src_mac);
975 if (likely(f)) {
5ca5461c 976 struct vxlan_rdst *rdst = first_remote_rcu(f);
3e61aa8f 977
e4c7ed41 978 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
26a41ae6 979 return false;
980
981 /* Don't migrate static entries, drop packets */
eb064c3b 982 if (f->state & NUD_NOARP)
26a41ae6 983 return true;
d342894c 984
985 if (net_ratelimit())
986 netdev_info(dev,
e4c7ed41 987 "%pM migrated from %pIS to %pIS\n",
a4870f79 988 src_mac, &rdst->remote_ip.sa, &src_ip->sa);
d342894c 989
e4c7ed41 990 rdst->remote_ip = *src_ip;
d342894c 991 f->updated = jiffies;
9e4b93f9 992 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
d342894c 993 } else {
994 /* learned new entry */
995 spin_lock(&vxlan->hash_lock);
3bf74b1a 996
997 /* close off race between vxlan_flush and incoming packets */
998 if (netif_running(dev))
999 vxlan_fdb_create(vxlan, src_mac, src_ip,
1000 NUD_REACHABLE,
1001 NLM_F_EXCL|NLM_F_CREATE,
0dfbdf41 1002 vxlan->cfg.dst_port,
3bf74b1a 1003 vxlan->default_dst.remote_vni,
1004 0, NTF_SELF);
d342894c 1005 spin_unlock(&vxlan->hash_lock);
1006 }
26a41ae6 1007
1008 return false;
d342894c 1009}
1010
d342894c 1011/* See if multicast group is already in use by other ID */
95ab0991 1012static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
d342894c 1013{
553675fb 1014 struct vxlan_dev *vxlan;
b1be00a6 1015 unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
d342894c 1016
95ab0991
G		 1017 /* The vxlan_sock is only used by dev, leaving group has
1018 * no effect on other vxlan devices.
1019 */
b1be00a6
JB		 1020 if (family == AF_INET && dev->vn4_sock &&
1021 atomic_read(&dev->vn4_sock->refcnt) == 1)
95ab0991 1022 return false;
b1be00a6
JB		 1023#if IS_ENABLED(CONFIG_IPV6)
1024 if (family == AF_INET6 && dev->vn6_sock &&
1025 atomic_read(&dev->vn6_sock->refcnt) == 1)
1026 return false;
1027#endif
95ab0991 1028
553675fb 1029 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
95ab0991 1030 if (!netif_running(vxlan->dev) || vxlan == dev)
553675fb 1031 continue;
d342894c 1032
b1be00a6 1033 if (family == AF_INET && vxlan->vn4_sock != dev->vn4_sock)
95ab0991 1034 continue;
b1be00a6
JB		 1035#if IS_ENABLED(CONFIG_IPV6)
1036 if (family == AF_INET6 && vxlan->vn6_sock != dev->vn6_sock)
1037 continue;
1038#endif
95ab0991
G		 1039
1040 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1041 &dev->default_dst.remote_ip))
1042 continue;
1043
1044 if (vxlan->default_dst.remote_ifindex !=
1045 dev->default_dst.remote_ifindex)
1046 continue;
1047
1048 return true;
553675fb 1049 }
d342894c 1050
1051 return false;
1052}
1053
b1be00a6 1054static void __vxlan_sock_release(struct vxlan_sock *vs)
7c47cedf 1055{
b1be00a6 1056 struct vxlan_net *vn;
012a5729 1057
b1be00a6
JB		 1058 if (!vs)
1059 return;
7c47cedf
SH		 1060 if (!atomic_dec_and_test(&vs->refcnt))
1061 return;
d342894c 1062
b1be00a6 1063 vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1c51a915 1064 spin_lock(&vn->sock_lock);
7c47cedf 1065 hlist_del_rcu(&vs->hlist);
dc01e7d3 1066 vxlan_notify_del_rx_port(vs);
1c51a915
SH		 1067 spin_unlock(&vn->sock_lock);
1068
7c47cedf 1069 queue_work(vxlan_wq, &vs->del_work);
d342894c 1070}
1071
b1be00a6
JB		 1072static void vxlan_sock_release(struct vxlan_dev *vxlan)
1073{
1074 __vxlan_sock_release(vxlan->vn4_sock);
1075#if IS_ENABLED(CONFIG_IPV6)
1076 __vxlan_sock_release(vxlan->vn6_sock);
1077#endif
1078}
1079
56ef9c90 1080/* Update multicast group membership when first VNI on
c4b49512 1081 * multicast address is brought up
7c47cedf 1082 */
56ef9c90 1083static int vxlan_igmp_join(struct vxlan_dev *vxlan)
d342894c 1084{
b1be00a6 1085 struct sock *sk;
e4c7ed41
CW		 1086 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1087 int ifindex = vxlan->default_dst.remote_ifindex;
149d7549 1088 int ret = -EINVAL;
d342894c 1089
e4c7ed41
CW		 1090 if (ip->sa.sa_family == AF_INET) {
1091 struct ip_mreqn mreq = {
1092 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1093 .imr_ifindex = ifindex,
1094 };
1095
b1be00a6
JB		 1096 sk = vxlan->vn4_sock->sock->sk;
1097 lock_sock(sk);
56ef9c90 1098 ret = ip_mc_join_group(sk, &mreq);
b1be00a6 1099 release_sock(sk);
e4c7ed41
CW		 1100#if IS_ENABLED(CONFIG_IPV6)
1101 } else {
b1be00a6
JB		 1102 sk = vxlan->vn6_sock->sock->sk;
1103 lock_sock(sk);
56ef9c90
MRL		 1104 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1105 &ip->sin6.sin6_addr);
b1be00a6 1106 release_sock(sk);
e4c7ed41
CW		 1107#endif
1108 }
3fc2de2f 1109
56ef9c90 1110 return ret;
3fc2de2f 1111}
1112
1113/* Inverse of vxlan_igmp_join when last VNI is brought down */
56ef9c90 1114static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
3fc2de2f 1115{
b1be00a6 1116 struct sock *sk;
e4c7ed41
CW		 1117 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1118 int ifindex = vxlan->default_dst.remote_ifindex;
149d7549 1119 int ret = -EINVAL;
3fc2de2f 1120
e4c7ed41
CW		 1121 if (ip->sa.sa_family == AF_INET) {
1122 struct ip_mreqn mreq = {
1123 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1124 .imr_ifindex = ifindex,
1125 };
1126
b1be00a6
JB		 1127 sk = vxlan->vn4_sock->sock->sk;
1128 lock_sock(sk);
56ef9c90 1129 ret = ip_mc_leave_group(sk, &mreq);
b1be00a6 1130 release_sock(sk);
e4c7ed41
CW		 1131#if IS_ENABLED(CONFIG_IPV6)
1132 } else {
b1be00a6
JB		 1133 sk = vxlan->vn6_sock->sock->sk;
1134 lock_sock(sk);
56ef9c90
MRL		 1135 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1136 &ip->sin6.sin6_addr);
b1be00a6 1137 release_sock(sk);
e4c7ed41
CW		 1138#endif
1139 }
d342894c 1140
56ef9c90 1141 return ret;
d342894c 1142}
1143
f14ecebb
JB		 1144static bool vxlan_remcsum(struct vxlanhdr *unparsed,
1145 struct sk_buff *skb, u32 vxflags)
dfd8645e 1146{
7d34fa75 1147 size_t start, offset;
dfd8645e 1148
f14ecebb
JB		 1149 if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
1150 goto out;
b7fe10e5 1151
f14ecebb
JB		 1152 start = vxlan_rco_start(unparsed->vx_vni);
1153 offset = start + vxlan_rco_offset(unparsed->vx_vni);
dfd8645e 1154
7d34fa75 1155 if (!pskb_may_pull(skb, offset + sizeof(u16)))
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 1166static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
64f87d36 1167 struct sk_buff *skb, u32 vxflags,
10a5af23 1168 struct vxlan_metadata *md)
3288af08 1169{
f14ecebb 1170 struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
10a5af23 1171 struct metadata_dst *tun_dst;
f14ecebb
JB		 1172
1173 if (!(unparsed->vx_flags & VXLAN_HF_GBP))
1174 goto out;
3288af08 1175
3288af08
JB		 1176 md->gbp = ntohs(gbp->policy_id);
1177
10a5af23 1178 tun_dst = (struct metadata_dst *)skb_dst(skb);
810813c4 1179 if (tun_dst) {
3288af08 1180 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
810813c4
DM		 1181 tun_dst->u.tun_info.options_len = sizeof(*md);
1182 }
3288af08
JB		 1183 if (gbp->dont_learn)
1184 md->gbp |= VXLAN_GBP_DONT_LEARN;
1185
1186 if (gbp->policy_applied)
1187 md->gbp |= VXLAN_GBP_POLICY_APPLIED;
f14ecebb 1188
64f87d36
JB		 1189 /* In flow-based mode, GBP is carried in dst_metadata */
1190 if (!(vxflags & VXLAN_F_COLLECT_METADATA))
1191 skb->mark = md->gbp;
f14ecebb
JB		 1192out:
1193 unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
3288af08
JB		 1194}
1195
1ab016e2
JB		 1196static bool vxlan_set_mac(struct vxlan_dev *vxlan,
1197 struct vxlan_sock *vs,
1198 struct sk_buff *skb)
614732ea 1199{
614732ea 1200 union vxlan_addr saddr;
614732ea 1201
614732ea 1202 skb_reset_mac_header(skb);
614732ea
TG		 1203 skb->protocol = eth_type_trans(skb, vxlan->dev);
1204 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1205
1206 /* Ignore packet loops (and multicast echo) */
1207 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1ab016e2 1208 return false;
614732ea 1209
760c6805 1210 /* Get address from the outer IP header */
ce212d0f 1211 if (vxlan_get_sk_family(vs) == AF_INET) {
1ab016e2 1212 saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
614732ea
TG		 1213 saddr.sa.sa_family = AF_INET;
1214#if IS_ENABLED(CONFIG_IPV6)
1215 } else {
1ab016e2 1216 saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
614732ea
TG		 1217 saddr.sa.sa_family = AF_INET6;
1218#endif
1219 }
1220
1ab016e2
JB		 1221 if ((vxlan->flags & VXLAN_F_LEARN) &&
1222 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
1223 return false;
1224
1225 return true;
1226}
1227
760c6805
JB		 1228static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph,
1229 struct sk_buff *skb)
1230{
1231 int err = 0;
1232
1233 if (vxlan_get_sk_family(vs) == AF_INET)
1234 err = IP_ECN_decapsulate(oiph, skb);
1235#if IS_ENABLED(CONFIG_IPV6)
1236 else
1237 err = IP6_ECN_decapsulate(oiph, skb);
1238#endif
1239
1240 if (unlikely(err) && log_ecn_error) {
1241 if (vxlan_get_sk_family(vs) == AF_INET)
1242 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1243 &((struct iphdr *)oiph)->saddr,
1244 ((struct iphdr *)oiph)->tos);
1245 else
1246 net_info_ratelimited("non-ECT from %pI6\n",
1247 &((struct ipv6hdr *)oiph)->saddr);
1248 }
1249 return err <= 1;
1250}
1251
d342894c 1252/* Callback from net/ipv4/udp.c to receive packets */
f2d1968e 1253static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
d342894c 1254{
f2d1968e 1255 struct pcpu_sw_netstats *stats;
c9e78efb 1256 struct vxlan_dev *vxlan;
5cfccc5a 1257 struct vxlan_sock *vs;
f14ecebb 1258 struct vxlanhdr unparsed;
ee122c79
TG		 1259 struct vxlan_metadata _md;
1260 struct vxlan_metadata *md = &_md;
f2d1968e 1261 void *oiph;
d342894c 1262
d342894c 1263 /* Need Vxlan and inner Ethernet header to be present */
7ce04758 1264 if (!pskb_may_pull(skb, VXLAN_HLEN))
288b01c8 1265 return 1;
d342894c 1266
f14ecebb 1267 unparsed = *vxlan_hdr(skb);
288b01c8
JB		 1268 /* VNI flag always required to be set */
1269 if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
1270 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1271 ntohl(vxlan_hdr(skb)->vx_flags),
1272 ntohl(vxlan_hdr(skb)->vx_vni));
1273 /* Return non vxlan pkt */
1274 return 1;
d342894c 1275 }
288b01c8
JB		 1276 unparsed.vx_flags &= ~VXLAN_HF_VNI;
1277 unparsed.vx_vni &= ~VXLAN_VNI_MASK;
d342894c 1278
559835ea 1279 vs = rcu_dereference_sk_user_data(sk);
5cfccc5a 1280 if (!vs)
d342894c 1281 goto drop;
d342894c 1282
c9e78efb
JB		 1283 vxlan = vxlan_vs_find_vni(vs, vxlan_vni(vxlan_hdr(skb)->vx_vni));
1284 if (!vxlan)
1285 goto drop;
1286
7f290c94
JB		 1287 if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB),
1288 !net_eq(vxlan->net, dev_net(vxlan->dev))))
c9e78efb
JB		 1289 goto drop;
1290
ee122c79 1291 if (vxlan_collect_metadata(vs)) {
07dabf20 1292 __be32 vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
10a5af23 1293 struct metadata_dst *tun_dst;
07dabf20 1294
c29a70d2 1295 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
07dabf20 1296 vxlan_vni_to_tun_id(vni), sizeof(*md));
c29a70d2 1297
ee122c79
TG		 1298 if (!tun_dst)
1299 goto drop;
1300
0f1b7354 1301 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
10a5af23
JB		 1302
1303 skb_dst_set(skb, (struct dst_entry *)tun_dst);
ee122c79
TG		 1304 } else {
1305 memset(md, 0, sizeof(*md));
1306 }
1307
3511494c
TG		 1308 /* For backwards compatibility, only allow reserved fields to be
1309 * used by VXLAN extensions if explicitly requested.
1310 */
f14ecebb
JB		 1311 if (vs->flags & VXLAN_F_REMCSUM_RX)
1312 if (!vxlan_remcsum(&unparsed, skb, vs->flags))
1313 goto drop;
1314 if (vs->flags & VXLAN_F_GBP)
10a5af23 1315 vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md);
3511494c 1316
f14ecebb 1317 if (unparsed.vx_flags || unparsed.vx_vni) {
3bf39475
TH		 1318 /* If there are any unprocessed flags remaining treat
1319 * this as a malformed packet. This behavior diverges from
1320 * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1321 * in reserved fields are to be ignored. The approach here
c4b49512 1322 * maintains compatibility with previous stack code, and also
3bf39475
TH		 1323 * is more robust and provides a little more security in
1324 * adding extensions to VXLAN.
1325 */
288b01c8 1326 goto drop;
3bf39475
TH		 1327 }
1328
f2d1968e
JB		 1329 if (!vxlan_set_mac(vxlan, vs, skb))
1330 goto drop;
1331
f2d1968e
JB		 1332 oiph = skb_network_header(skb);
1333 skb_reset_network_header(skb);
1334
1335 if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
1336 ++vxlan->dev->stats.rx_frame_errors;
1337 ++vxlan->dev->stats.rx_errors;
1338 goto drop;
1339 }
1340
1341 stats = this_cpu_ptr(vxlan->dev->tstats);
1342 u64_stats_update_begin(&stats->syncp);
1343 stats->rx_packets++;
1344 stats->rx_bytes += skb->len;
1345 u64_stats_update_end(&stats->syncp);
1346
1347 gro_cells_receive(&vxlan->gro_cells, skb);
5cfccc5a
PS		 1348 return 0;
1349
1350drop:
288b01c8
JB		 1351 /* Consume bad packet */
1352 kfree_skb(skb);
1353 return 0;
5cfccc5a
PS		 1354}
1355
e4f67add
DS		 1356static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1357{
1358 struct vxlan_dev *vxlan = netdev_priv(dev);
1359 struct arphdr *parp;
1360 u8 *arpptr, *sha;
1361 __be32 sip, tip;
1362 struct neighbour *n;
1363
1364 if (dev->flags & IFF_NOARP)
1365 goto out;
1366
1367 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1368 dev->stats.tx_dropped++;
1369 goto out;
1370 }
1371 parp = arp_hdr(skb);
1372
1373 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1374 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1375 parp->ar_pro != htons(ETH_P_IP) ||
1376 parp->ar_op != htons(ARPOP_REQUEST) ||
1377 parp->ar_hln != dev->addr_len ||
1378 parp->ar_pln != 4)
1379 goto out;
1380 arpptr = (u8 *)parp + sizeof(struct arphdr);
1381 sha = arpptr;
1382 arpptr += dev->addr_len; /* sha */
1383 memcpy(&sip, arpptr, sizeof(sip));
1384 arpptr += sizeof(sip);
1385 arpptr += dev->addr_len; /* tha */
1386 memcpy(&tip, arpptr, sizeof(tip));
1387
1388 if (ipv4_is_loopback(tip) ||
1389 ipv4_is_multicast(tip))
1390 goto out;
1391
1392 n = neigh_lookup(&arp_tbl, &tip, dev);
1393
1394 if (n) {
e4f67add
DS		 1395 struct vxlan_fdb *f;
1396 struct sk_buff *reply;
1397
1398 if (!(n->nud_state & NUD_CONNECTED)) {
1399 neigh_release(n);
1400 goto out;
1401 }
1402
1403 f = vxlan_find_mac(vxlan, n->ha);
e4c7ed41 1404 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
e4f67add
DS		 1405 /* bridge-local neighbor */
1406 neigh_release(n);
1407 goto out;
1408 }
1409
1410 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1411 n->ha, sha);
1412
1413 neigh_release(n);
1414
7346135d
DS		 1415 if (reply == NULL)
1416 goto out;
1417
e4f67add
DS		 1418 skb_reset_mac_header(reply);
1419 __skb_pull(reply, skb_network_offset(reply));
1420 reply->ip_summed = CHECKSUM_UNNECESSARY;
1421 reply->pkt_type = PACKET_HOST;
1422
1423 if (netif_rx_ni(reply) == NET_RX_DROP)
1424 dev->stats.rx_dropped++;
e4c7ed41
CW		 1425 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1426 union vxlan_addr ipa = {
1427 .sin.sin_addr.s_addr = tip,
a45e92a5 1428 .sin.sin_family = AF_INET,
e4c7ed41
CW		 1429 };
1430
1431 vxlan_ip_miss(dev, &ipa);
1432 }
e4f67add
DS		 1433out:
1434 consume_skb(skb);
1435 return NETDEV_TX_OK;
1436}
1437
f564f45c 1438#if IS_ENABLED(CONFIG_IPV6)
4b29dba9
DS		 1439static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1440 struct neighbour *n, bool isrouter)
1441{
1442 struct net_device *dev = request->dev;
1443 struct sk_buff *reply;
1444 struct nd_msg *ns, *na;
1445 struct ipv6hdr *pip6;
1446 u8 *daddr;
1447 int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1448 int ns_olen;
1449 int i, len;
1450
1451 if (dev == NULL)
1452 return NULL;
1453
1454 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1455 sizeof(*na) + na_olen + dev->needed_tailroom;
1456 reply = alloc_skb(len, GFP_ATOMIC);
1457 if (reply == NULL)
1458 return NULL;
1459
1460 reply->protocol = htons(ETH_P_IPV6);
1461 reply->dev = dev;
1462 skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1463 skb_push(reply, sizeof(struct ethhdr));
6297b91c 1464 skb_reset_mac_header(reply);
4b29dba9
DS		 1465
1466 ns = (struct nd_msg *)skb_transport_header(request);
1467
1468 daddr = eth_hdr(request)->h_source;
1469 ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
1470 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1471 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1472 daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1473 break;
1474 }
1475 }
1476
1477 /* Ethernet header */
1478 ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1479 ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1480 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1481 reply->protocol = htons(ETH_P_IPV6);
1482
1483 skb_pull(reply, sizeof(struct ethhdr));
6297b91c 1484 skb_reset_network_header(reply);
4b29dba9
DS		 1485 skb_put(reply, sizeof(struct ipv6hdr));
1486
1487 /* IPv6 header */
1488
1489 pip6 = ipv6_hdr(reply);
1490 memset(pip6, 0, sizeof(struct ipv6hdr));
1491 pip6->version = 6;
1492 pip6->priority = ipv6_hdr(request)->priority;
1493 pip6->nexthdr = IPPROTO_ICMPV6;
1494 pip6->hop_limit = 255;
1495 pip6->daddr = ipv6_hdr(request)->saddr;
1496 pip6->saddr = *(struct in6_addr *)n->primary_key;
1497
1498 skb_pull(reply, sizeof(struct ipv6hdr));
6297b91c 1499 skb_reset_transport_header(reply);
4b29dba9
DS		 1500
1501 na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1502
1503 /* Neighbor Advertisement */
1504 memset(na, 0, sizeof(*na)+na_olen);
1505 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1506 na->icmph.icmp6_router = isrouter;
1507 na->icmph.icmp6_override = 1;
1508 na->icmph.icmp6_solicited = 1;
1509 na->target = ns->target;
1510 ether_addr_copy(&na->opt[2], n->ha);
1511 na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1512 na->opt[1] = na_olen >> 3;
1513
1514 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1515 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1516 csum_partial(na, sizeof(*na)+na_olen, 0));
1517
1518 pip6->payload_len = htons(sizeof(*na)+na_olen);
1519
1520 skb_push(reply, sizeof(struct ipv6hdr));
1521
1522 reply->ip_summed = CHECKSUM_UNNECESSARY;
1523
1524 return reply;
1525}
1526
f564f45c
CW		 1527static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1528{
1529 struct vxlan_dev *vxlan = netdev_priv(dev);
4b29dba9 1530 struct nd_msg *msg;
f564f45c
CW		 1531 const struct ipv6hdr *iphdr;
1532 const struct in6_addr *saddr, *daddr;
4b29dba9
DS		 1533 struct neighbour *n;
1534 struct inet6_dev *in6_dev;
f564f45c
CW		 1535
1536 in6_dev = __in6_dev_get(dev);
1537 if (!in6_dev)
1538 goto out;
1539
f564f45c
CW		 1540 iphdr = ipv6_hdr(skb);
1541 saddr = &iphdr->saddr;
1542 daddr = &iphdr->daddr;
1543
f564f45c
CW		 1544 msg = (struct nd_msg *)skb_transport_header(skb);
1545 if (msg->icmph.icmp6_code != 0 ||
1546 msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1547 goto out;
1548
4b29dba9
DS		 1549 if (ipv6_addr_loopback(daddr) ||
1550 ipv6_addr_is_multicast(&msg->target))
1551 goto out;
1552
1553 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
f564f45c
CW		 1554
1555 if (n) {
1556 struct vxlan_fdb *f;
4b29dba9 1557 struct sk_buff *reply;
f564f45c
CW		 1558
1559 if (!(n->nud_state & NUD_CONNECTED)) {
1560 neigh_release(n);
1561 goto out;
1562 }
1563
1564 f = vxlan_find_mac(vxlan, n->ha);
1565 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1566 /* bridge-local neighbor */
1567 neigh_release(n);
1568 goto out;
1569 }
1570
4b29dba9
DS		 1571 reply = vxlan_na_create(skb, n,
1572 !!(f ? f->flags & NTF_ROUTER : 0));
1573
f564f45c 1574 neigh_release(n);
4b29dba9
DS		 1575
1576 if (reply == NULL)
1577 goto out;
1578
1579 if (netif_rx_ni(reply) == NET_RX_DROP)
1580 dev->stats.rx_dropped++;
1581
f564f45c 1582 } else if (vxlan->flags & VXLAN_F_L3MISS) {
4b29dba9
DS		 1583 union vxlan_addr ipa = {
1584 .sin6.sin6_addr = msg->target,
a45e92a5 1585 .sin6.sin6_family = AF_INET6,
4b29dba9
DS		 1586 };
1587
f564f45c
CW		 1588 vxlan_ip_miss(dev, &ipa);
1589 }
1590
1591out:
1592 consume_skb(skb);
1593 return NETDEV_TX_OK;
1594}
1595#endif
1596
e4f67add
DS		 1597static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1598{
1599 struct vxlan_dev *vxlan = netdev_priv(dev);
1600 struct neighbour *n;
e4f67add
DS		 1601
1602 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1603 return false;
1604
1605 n = NULL;
1606 switch (ntohs(eth_hdr(skb)->h_proto)) {
1607 case ETH_P_IP:
e15a00aa
CW		 1608 {
1609 struct iphdr *pip;
1610
e4f67add
DS		 1611 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1612 return false;
1613 pip = ip_hdr(skb);
1614 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
e4c7ed41
CW		 1615 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1616 union vxlan_addr ipa = {
1617 .sin.sin_addr.s_addr = pip->daddr,
a45e92a5 1618 .sin.sin_family = AF_INET,
e4c7ed41
CW		 1619 };
1620
1621 vxlan_ip_miss(dev, &ipa);
1622 return false;
1623 }
1624
e4f67add 1625 break;
e15a00aa
CW		 1626 }
1627#if IS_ENABLED(CONFIG_IPV6)
1628 case ETH_P_IPV6:
1629 {
1630 struct ipv6hdr *pip6;
1631
1632 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1633 return false;
1634 pip6 = ipv6_hdr(skb);
1635 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1636 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1637 union vxlan_addr ipa = {
1638 .sin6.sin6_addr = pip6->daddr,
a45e92a5 1639 .sin6.sin6_family = AF_INET6,
e15a00aa
CW		 1640 };
1641
1642 vxlan_ip_miss(dev, &ipa);
1643 return false;
1644 }
1645
1646 break;
1647 }
1648#endif
e4f67add
DS		 1649 default:
1650 return false;
1651 }
1652
1653 if (n) {
1654 bool diff;
1655
7367d0b5 1656 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
e4f67add
DS		 1657 if (diff) {
1658 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1659 dev->addr_len);
1660 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1661 }
1662 neigh_release(n);
1663 return diff;
e4c7ed41
CW		 1664 }
1665
e4f67add
DS		 1666 return false;
1667}
1668
af33c1ad 1669static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
3511494c
TG		 1670 struct vxlan_metadata *md)
1671{
1672 struct vxlanhdr_gbp *gbp;
1673
db79a621
TG		 1674 if (!md->gbp)
1675 return;
1676
3511494c 1677 gbp = (struct vxlanhdr_gbp *)vxh;
54bfd872 1678 vxh->vx_flags |= VXLAN_HF_GBP;
3511494c
TG		 1679
1680 if (md->gbp & VXLAN_GBP_DONT_LEARN)
1681 gbp->dont_learn = 1;
1682
1683 if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1684 gbp->policy_applied = 1;
1685
1686 gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1687}
1688
f491e56d
JB		 1689static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
1690 int iphdr_len, __be32 vni,
1691 struct vxlan_metadata *md, u32 vxflags,
b4ed5cad 1692 bool udp_sum)
e4c7ed41 1693{
e4c7ed41 1694 struct vxlanhdr *vxh;
e4c7ed41
CW		 1695 int min_headroom;
1696 int err;
dfd8645e 1697 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
dfd8645e 1698
af33c1ad 1699 if ((vxflags & VXLAN_F_REMCSUM_TX) &&
dfd8645e
TH		 1700 skb->ip_summed == CHECKSUM_PARTIAL) {
1701 int csum_start = skb_checksum_start_offset(skb);
1702
1703 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1704 !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1705 (skb->csum_offset == offsetof(struct udphdr, check) ||
b5708501 1706 skb->csum_offset == offsetof(struct tcphdr, check)))
dfd8645e 1707 type |= SKB_GSO_TUNNEL_REMCSUM;
dfd8645e 1708 }
e4c7ed41 1709
e4c7ed41 1710 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
f491e56d 1711 + VXLAN_HLEN + iphdr_len
df8a39de 1712 + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
649c5b8b
PS		 1713
1714 /* Need space for new headers (invalidates iph ptr) */
1715 err = skb_cow_head(skb, min_headroom);
74f47278
PS		 1716 if (unlikely(err)) {
1717 kfree_skb(skb);
649c5b8b 1718 return err;
74f47278 1719 }
649c5b8b 1720
5968250c
JP		 1721 skb = vlan_hwaccel_push_inside(skb);
1722 if (WARN_ON(!skb))
1723 return -ENOMEM;
1eaa8178 1724
6fa79666 1725 skb = iptunnel_handle_offloads(skb, type);
b736a623
JG		 1726 if (IS_ERR(skb))
1727 return PTR_ERR(skb);
1728
49560532 1729 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
54bfd872
JB		 1730 vxh->vx_flags = VXLAN_HF_VNI;
1731 vxh->vx_vni = vxlan_vni_field(vni);
49560532 1732
dfd8645e 1733 if (type & SKB_GSO_TUNNEL_REMCSUM) {
54bfd872 1734 unsigned int start;
dfd8645e 1735
54bfd872
JB		 1736 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
1737 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
1738 vxh->vx_flags |= VXLAN_HF_RCO;
dfd8645e
TH		 1739
1740 if (!skb_is_gso(skb)) {
1741 skb->ip_summed = CHECKSUM_NONE;
1742 skb->encapsulation = 0;
1743 }
1744 }
1745
af33c1ad
TH		 1746 if (vxflags & VXLAN_F_GBP)
1747 vxlan_build_gbp_hdr(vxh, vxflags, md);
3511494c 1748
996c9fd1 1749 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
039f5062 1750 return 0;
49560532 1751}
49560532 1752
1a8496ba
JB		 1753static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan,
1754 struct sk_buff *skb, int oif, u8 tos,
0c1d70af
PA		 1755 __be32 daddr, __be32 *saddr,
1756 struct dst_cache *dst_cache,
db3c6139 1757 const struct ip_tunnel_info *info)
1a8496ba 1758{
db3c6139 1759 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
1a8496ba
JB		 1760 struct rtable *rt = NULL;
1761 struct flowi4 fl4;
1762
db3c6139
DB		 1763 if (tos && !info)
1764 use_cache = false;
1765 if (use_cache) {
0c1d70af
PA		 1766 rt = dst_cache_get_ip4(dst_cache, saddr);
1767 if (rt)
1768 return rt;
1769 }
1770
1a8496ba
JB		 1771 memset(&fl4, 0, sizeof(fl4));
1772 fl4.flowi4_oif = oif;
1773 fl4.flowi4_tos = RT_TOS(tos);
1774 fl4.flowi4_mark = skb->mark;
1775 fl4.flowi4_proto = IPPROTO_UDP;
1776 fl4.daddr = daddr;
1777 fl4.saddr = vxlan->cfg.saddr.sin.sin_addr.s_addr;
1778
1779 rt = ip_route_output_key(vxlan->net, &fl4);
0c1d70af 1780 if (!IS_ERR(rt)) {
1a8496ba 1781 *saddr = fl4.saddr;
0c1d70af
PA		 1782 if (use_cache)
1783 dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
1784 }
1a8496ba
JB		 1785 return rt;
1786}
1787
e5d4b29f
JB		 1788#if IS_ENABLED(CONFIG_IPV6)
1789static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
1400615d 1790 struct sk_buff *skb, int oif, u8 tos,
e7f70af1 1791 __be32 label,
e5d4b29f 1792 const struct in6_addr *daddr,
0c1d70af 1793 struct in6_addr *saddr,
db3c6139
DB		 1794 struct dst_cache *dst_cache,
1795 const struct ip_tunnel_info *info)
e5d4b29f 1796{
db3c6139 1797 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
e5d4b29f
JB		 1798 struct dst_entry *ndst;
1799 struct flowi6 fl6;
1800 int err;
1801
1400615d
DB		 1802 if (tos && !info)
1803 use_cache = false;
db3c6139 1804 if (use_cache) {
0c1d70af
PA		 1805 ndst = dst_cache_get_ip6(dst_cache, saddr);
1806 if (ndst)
1807 return ndst;
1808 }
1809
e5d4b29f
JB		 1810 memset(&fl6, 0, sizeof(fl6));
1811 fl6.flowi6_oif = oif;
1812 fl6.daddr = *daddr;
1813 fl6.saddr = vxlan->cfg.saddr.sin6.sin6_addr;
eaa93bf4 1814 fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tos), label);
e5d4b29f
JB		 1815 fl6.flowi6_mark = skb->mark;
1816 fl6.flowi6_proto = IPPROTO_UDP;
1817
1818 err = ipv6_stub->ipv6_dst_lookup(vxlan->net,
1819 vxlan->vn6_sock->sock->sk,
1820 &ndst, &fl6);
1821 if (err < 0)
1822 return ERR_PTR(err);
1823
1824 *saddr = fl6.saddr;
db3c6139 1825 if (use_cache)
0c1d70af 1826 dst_cache_set_ip6(dst_cache, ndst, saddr);
e5d4b29f
JB		 1827 return ndst;
1828}
1829#endif
1830
9dcc71e1
SS		 1831/* Bypass encapsulation if the destination is local */
1832static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1833 struct vxlan_dev *dst_vxlan)
1834{
8f84985f 1835 struct pcpu_sw_netstats *tx_stats, *rx_stats;
e4c7ed41
CW		 1836 union vxlan_addr loopback;
1837 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
ce6502a8
LR		 1838 struct net_device *dev = skb->dev;
1839 int len = skb->len;
9dcc71e1 1840
8f84985f
LR		 1841 tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1842 rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
9dcc71e1
SS		 1843 skb->pkt_type = PACKET_HOST;
1844 skb->encapsulation = 0;
1845 skb->dev = dst_vxlan->dev;
1846 __skb_pull(skb, skb_network_offset(skb));
1847
e4c7ed41
CW		 1848 if (remote_ip->sa.sa_family == AF_INET) {
1849 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1850 loopback.sa.sa_family = AF_INET;
1851#if IS_ENABLED(CONFIG_IPV6)
1852 } else {
1853 loopback.sin6.sin6_addr = in6addr_loopback;
1854 loopback.sa.sa_family = AF_INET6;
1855#endif
1856 }
1857
9dcc71e1 1858 if (dst_vxlan->flags & VXLAN_F_LEARN)
e4c7ed41 1859 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
9dcc71e1
SS		 1860
1861 u64_stats_update_begin(&tx_stats->syncp);
1862 tx_stats->tx_packets++;
ce6502a8 1863 tx_stats->tx_bytes += len;
9dcc71e1
SS		 1864 u64_stats_update_end(&tx_stats->syncp);
1865
1866 if (netif_rx(skb) == NET_RX_SUCCESS) {
1867 u64_stats_update_begin(&rx_stats->syncp);
1868 rx_stats->rx_packets++;
ce6502a8 1869 rx_stats->rx_bytes += len;
9dcc71e1
SS		 1870 u64_stats_update_end(&rx_stats->syncp);
1871 } else {
ce6502a8 1872 dev->stats.rx_dropped++;
9dcc71e1
SS		 1873 }
1874}
1875
4ad16930
SH		 1876static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1877 struct vxlan_rdst *rdst, bool did_rsc)
d342894c 1878{
d71785ff 1879 struct dst_cache *dst_cache;
3093fbe7 1880 struct ip_tunnel_info *info;
d342894c 1881 struct vxlan_dev *vxlan = netdev_priv(dev);
b1be00a6 1882 struct sock *sk;
e4c7ed41 1883 struct rtable *rt = NULL;
d342894c 1884 const struct iphdr *old_iph;
e4c7ed41 1885 union vxlan_addr *dst;
ee122c79
TG		 1886 union vxlan_addr remote_ip;
1887 struct vxlan_metadata _md;
1888 struct vxlan_metadata *md = &_md;
e4c7ed41 1889 __be16 src_port = 0, dst_port;
e7f70af1 1890 __be32 vni, label;
d342894c 1891 __be16 df = 0;
1892 __u8 tos, ttl;
0e6fbc5b 1893 int err;
ee122c79 1894 u32 flags = vxlan->flags;
b4ed5cad 1895 bool udp_sum = false;
f491e56d 1896 bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
d342894c 1897
61adedf3 1898 info = skb_tunnel_info(skb);
3093fbe7 1899
ee122c79 1900 if (rdst) {
0dfbdf41 1901 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
ee122c79
TG		 1902 vni = rdst->remote_vni;
1903 dst = &rdst->remote_ip;
d71785ff 1904 dst_cache = &rdst->dst_cache;
ee122c79
TG		 1905 } else {
1906 if (!info) {
1907 WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
1908 dev->name);
1909 goto drop;
1910 }
0dfbdf41 1911 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
54bfd872 1912 vni = vxlan_tun_id_to_vni(info->key.tun_id);
b1be00a6
JB		 1913 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
1914 if (remote_ip.sa.sa_family == AF_INET)
a725e514
JB		 1915 remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
1916 else
1917 remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
ee122c79 1918 dst = &remote_ip;
d71785ff 1919 dst_cache = &info->dst_cache;
ee122c79 1920 }
e4f67add 1921
e4c7ed41 1922 if (vxlan_addr_any(dst)) {
e4f67add 1923 if (did_rsc) {
e4f67add 1924 /* short-circuited back to local bridge */
9dcc71e1 1925 vxlan_encap_bypass(skb, vxlan, vxlan);
4ad16930 1926 return;
e4f67add 1927 }
ef59febe 1928 goto drop;
e4f67add 1929 }
ef59febe 1930
d342894c 1931 old_iph = ip_hdr(skb);
1932
0dfbdf41 1933 ttl = vxlan->cfg.ttl;
e4c7ed41 1934 if (!ttl && vxlan_addr_multicast(dst))
d342894c 1935 ttl = 1;
1936
0dfbdf41 1937 tos = vxlan->cfg.tos;
d342894c 1938 if (tos == 1)
206aaafc 1939 tos = ip_tunnel_get_dsfield(old_iph, skb);
d342894c 1940
e7f70af1 1941 label = vxlan->cfg.label;
0dfbdf41
TG		 1942 src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
1943 vxlan->cfg.port_max, true);
d342894c 1944
a725e514 1945 if (info) {
a725e514
JB		 1946 ttl = info->key.ttl;
1947 tos = info->key.tos;
e7f70af1 1948 label = info->key.label;
b4ed5cad 1949 udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
a725e514
JB		 1950
1951 if (info->options_len)
4c222798 1952 md = ip_tunnel_info_opts(info);
a725e514
JB		 1953 } else {
1954 md->gbp = skb->mark;
1955 }
1956
e4c7ed41 1957 if (dst->sa.sa_family == AF_INET) {
1a8496ba
JB		 1958 __be32 saddr;
1959
b1be00a6
JB		 1960 if (!vxlan->vn4_sock)
1961 goto drop;
1962 sk = vxlan->vn4_sock->sock->sk;
1963
1a8496ba
JB		 1964 rt = vxlan_get_route(vxlan, skb,
1965 rdst ? rdst->remote_ifindex : 0, tos,
0c1d70af 1966 dst->sin.sin_addr.s_addr, &saddr,
d71785ff 1967 dst_cache, info);
e4c7ed41
CW		 1968 if (IS_ERR(rt)) {
1969 netdev_dbg(dev, "no route to %pI4\n",
1970 &dst->sin.sin_addr.s_addr);
1971 dev->stats.tx_carrier_errors++;
1972 goto tx_error;
1973 }
d342894c 1974
e4c7ed41
CW		 1975 if (rt->dst.dev == dev) {
1976 netdev_dbg(dev, "circular route to %pI4\n",
1977 &dst->sin.sin_addr.s_addr);
1978 dev->stats.collisions++;
fffc15a5 1979 goto rt_tx_error;
e4c7ed41
CW		 1980 }
1981
1982 /* Bypass encapsulation if the destination is local */
1983 if (rt->rt_flags & RTCF_LOCAL &&
1984 !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1985 struct vxlan_dev *dst_vxlan;
1986
1987 ip_rt_put(rt);
19ca9fc1 1988 dst_vxlan = vxlan_find_vni(vxlan->net, vni,
ac5132d1
TG		 1989 dst->sa.sa_family, dst_port,
1990 vxlan->flags);
e4c7ed41
CW		 1991 if (!dst_vxlan)
1992 goto tx_error;
1993 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1994 return;
1995 }
1996
6ceb31ca
AD		 1997 if (!info)
1998 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
1999 else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT)
2000 df = htons(IP_DF);
2001
e4c7ed41
CW		 2002 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2003 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
f491e56d 2004 err = vxlan_build_skb(skb, &rt->dst, sizeof(struct iphdr),
54bfd872 2005 vni, md, flags, udp_sum);
f491e56d
JB		 2006 if (err < 0)
2007 goto xmit_tx_error;
2008
2009 udp_tunnel_xmit_skb(rt, sk, skb, saddr,
2010 dst->sin.sin_addr.s_addr, tos, ttl, df,
2011 src_port, dst_port, xnet, !udp_sum);
e4c7ed41
CW		 2012#if IS_ENABLED(CONFIG_IPV6)
2013 } else {
e4c7ed41 2014 struct dst_entry *ndst;
e5d4b29f 2015 struct in6_addr saddr;
6f264e47 2016 u32 rt6i_flags;
e4c7ed41 2017
b1be00a6
JB		 2018 if (!vxlan->vn6_sock)
2019 goto drop;
2020 sk = vxlan->vn6_sock->sock->sk;
2021
e5d4b29f 2022 ndst = vxlan6_get_route(vxlan, skb,
1400615d 2023 rdst ? rdst->remote_ifindex : 0, tos,
e7f70af1 2024 label, &dst->sin6.sin6_addr, &saddr,
db3c6139 2025 dst_cache, info);
e5d4b29f 2026 if (IS_ERR(ndst)) {
e4c7ed41
CW		 2027 netdev_dbg(dev, "no route to %pI6\n",
2028 &dst->sin6.sin6_addr);
2029 dev->stats.tx_carrier_errors++;
9dcc71e1 2030 goto tx_error;
e4c7ed41 2031 }
d342894c 2032
e4c7ed41
CW		 2033 if (ndst->dev == dev) {
2034 netdev_dbg(dev, "circular route to %pI6\n",
2035 &dst->sin6.sin6_addr);
2036 dst_release(ndst);
2037 dev->stats.collisions++;
2038 goto tx_error;
2039 }
0e6fbc5b 2040
e4c7ed41 2041 /* Bypass encapsulation if the destination is local */
6f264e47
JB		 2042 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2043 if (rt6i_flags & RTF_LOCAL &&
2044 !(rt6i_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
e4c7ed41
CW		 2045 struct vxlan_dev *dst_vxlan;
2046
2047 dst_release(ndst);
19ca9fc1 2048 dst_vxlan = vxlan_find_vni(vxlan->net, vni,
ac5132d1
TG		 2049 dst->sa.sa_family, dst_port,
2050 vxlan->flags);
e4c7ed41
CW		 2051 if (!dst_vxlan)
2052 goto tx_error;
2053 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2054 return;
2055 }
49560532 2056
b4ed5cad
JB		 2057 if (!info)
2058 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
35e2d115 2059
1400615d 2060 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
e4c7ed41 2061 ttl = ttl ? : ip6_dst_hoplimit(ndst);
f491e56d
JB		 2062 skb_scrub_packet(skb, xnet);
2063 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
54bfd872 2064 vni, md, flags, udp_sum);
f491e56d
JB		 2065 if (err < 0) {
2066 dst_release(ndst);
2067 return;
2068 }
2069 udp_tunnel6_xmit_skb(ndst, sk, skb, dev,
e7f70af1
DB		 2070 &saddr, &dst->sin6.sin6_addr, tos, ttl,
2071 label, src_port, dst_port, !udp_sum);
e4c7ed41
CW		 2072#endif
2073 }
0e6fbc5b 2074
4ad16930 2075 return;
d342894c 2076
2077drop:
2078 dev->stats.tx_dropped++;
2079 goto tx_free;
2080
f491e56d
JB		 2081xmit_tx_error:
2082 /* skb is already freed. */
2083 skb = NULL;
49560532
PS		 2084rt_tx_error:
2085 ip_rt_put(rt);
d342894c 2086tx_error:
2087 dev->stats.tx_errors++;
2088tx_free:
2089 dev_kfree_skb(skb);
d342894c 2090}
2091
6681712d
DS		 2092/* Transmit local packets over Vxlan
2093 *
2094 * Outer IP header inherits ECN and DF from inner header.
2095 * Outer UDP destination is the VXLAN assigned port.
2096 * source port is based on hash of flow
2097 */
2098static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2099{
2100 struct vxlan_dev *vxlan = netdev_priv(dev);
3093fbe7 2101 const struct ip_tunnel_info *info;
6681712d
DS		 2102 struct ethhdr *eth;
2103 bool did_rsc = false;
8f646c92 2104 struct vxlan_rdst *rdst, *fdst = NULL;
6681712d 2105 struct vxlan_fdb *f;
6681712d 2106
61adedf3 2107 info = skb_tunnel_info(skb);
3093fbe7 2108
6681712d
DS		 2109 skb_reset_mac_header(skb);
2110 eth = eth_hdr(skb);
2111
f564f45c
CW		 2112 if ((vxlan->flags & VXLAN_F_PROXY)) {
2113 if (ntohs(eth->h_proto) == ETH_P_ARP)
2114 return arp_reduce(dev, skb);
2115#if IS_ENABLED(CONFIG_IPV6)
2116 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
91269e39
LR		 2117 pskb_may_pull(skb, sizeof(struct ipv6hdr)
2118 + sizeof(struct nd_msg)) &&
f564f45c
CW		 2119 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2120 struct nd_msg *msg;
2121
2122 msg = (struct nd_msg *)skb_transport_header(skb);
2123 if (msg->icmph.icmp6_code == 0 &&
2124 msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2125 return neigh_reduce(dev, skb);
2126 }
7a9f526f 2127 eth = eth_hdr(skb);
f564f45c
CW		 2128#endif
2129 }
6681712d 2130
f468a729
JB		 2131 if (vxlan->flags & VXLAN_F_COLLECT_METADATA) {
2132 if (info && info->mode & IP_TUNNEL_INFO_TX)
2133 vxlan_xmit_one(skb, dev, NULL, false);
2134 else
2135 kfree_skb(skb);
ee122c79
TG		 2136 return NETDEV_TX_OK;
2137 }
2138
6681712d 2139 f = vxlan_find_mac(vxlan, eth->h_dest);
ae884082
DS		 2140 did_rsc = false;
2141
2142 if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
e15a00aa
CW		 2143 (ntohs(eth->h_proto) == ETH_P_IP ||
2144 ntohs(eth->h_proto) == ETH_P_IPV6)) {
ae884082
DS		 2145 did_rsc = route_shortcircuit(dev, skb);
2146 if (did_rsc)
2147 f = vxlan_find_mac(vxlan, eth->h_dest);
2148 }
2149
6681712d 2150 if (f == NULL) {
afbd8bae
MR		 2151 f = vxlan_find_mac(vxlan, all_zeros_mac);
2152 if (f == NULL) {
2153 if ((vxlan->flags & VXLAN_F_L2MISS) &&
2154 !is_multicast_ether_addr(eth->h_dest))
2155 vxlan_fdb_miss(vxlan, eth->h_dest);
2156
2157 dev->stats.tx_dropped++;
8f646c92 2158 kfree_skb(skb);
afbd8bae
MR		 2159 return NETDEV_TX_OK;
2160 }
2161 }
6681712d 2162
afbd8bae
MR		 2163 list_for_each_entry_rcu(rdst, &f->remotes, list) {
2164 struct sk_buff *skb1;
6681712d 2165
8f646c92
ED		 2166 if (!fdst) {
2167 fdst = rdst;
2168 continue;
2169 }
afbd8bae
MR		 2170 skb1 = skb_clone(skb, GFP_ATOMIC);
2171 if (skb1)
2172 vxlan_xmit_one(skb1, dev, rdst, did_rsc);
6681712d
DS		 2173 }
2174
8f646c92
ED		 2175 if (fdst)
2176 vxlan_xmit_one(skb, dev, fdst, did_rsc);
2177 else
2178 kfree_skb(skb);
4ad16930 2179 return NETDEV_TX_OK;
6681712d
DS		 2180}
2181
d342894c 2182/* Walk the forwarding table and purge stale entries */
2183static void vxlan_cleanup(unsigned long arg)
2184{
2185 struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
2186 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2187 unsigned int h;
2188
2189 if (!netif_running(vxlan->dev))
2190 return;
2191
d342894c 2192 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2193 struct hlist_node *p, *n;
14e1d0fa
SD		 2194
2195 spin_lock_bh(&vxlan->hash_lock);
d342894c 2196 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2197 struct vxlan_fdb *f
2198 = container_of(p, struct vxlan_fdb, hlist);
2199 unsigned long timeout;
2200
3c172868 2201 if (f->state & NUD_PERMANENT)
d342894c 2202 continue;
2203
0dfbdf41 2204 timeout = f->used + vxlan->cfg.age_interval * HZ;
d342894c 2205 if (time_before_eq(timeout, jiffies)) {
2206 netdev_dbg(vxlan->dev,
2207 "garbage collect %pM\n",
2208 f->eth_addr);
2209 f->state = NUD_STALE;
2210 vxlan_fdb_destroy(vxlan, f);
2211 } else if (time_before(timeout, next_timer))
2212 next_timer = timeout;
2213 }
14e1d0fa 2214 spin_unlock_bh(&vxlan->hash_lock);
d342894c 2215 }
d342894c 2216
2217 mod_timer(&vxlan->age_timer, next_timer);
2218}
2219
9c2e24e1
PS		 2220static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
2221{
56ef9c90 2222 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
54bfd872 2223 __be32 vni = vxlan->default_dst.remote_vni;
9c2e24e1 2224
56ef9c90 2225 spin_lock(&vn->sock_lock);
9c2e24e1 2226 hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
56ef9c90 2227 spin_unlock(&vn->sock_lock);
9c2e24e1
PS		 2228}
2229
d342894c 2230/* Setup stats when device is created */
2231static int vxlan_init(struct net_device *dev)
2232{
1c213bd2 2233 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
e8171045 2234 if (!dev->tstats)
d342894c 2235 return -ENOMEM;
2236
2237 return 0;
2238}
2239
ba609e9b 2240static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
afbd8bae
MR		 2241{
2242 struct vxlan_fdb *f;
2243
2244 spin_lock_bh(&vxlan->hash_lock);
2245 f = __vxlan_find_mac(vxlan, all_zeros_mac);
2246 if (f)
2247 vxlan_fdb_destroy(vxlan, f);
2248 spin_unlock_bh(&vxlan->hash_lock);
2249}
2250
ebf4063e
SH		 2251static void vxlan_uninit(struct net_device *dev)
2252{
2253 struct vxlan_dev *vxlan = netdev_priv(dev);
ebf4063e 2254
ba609e9b 2255 vxlan_fdb_delete_default(vxlan);
afbd8bae 2256
ebf4063e
SH		 2257 free_percpu(dev->tstats);
2258}
2259
d342894c 2260/* Start ageing timer and join group when device is brought up */
2261static int vxlan_open(struct net_device *dev)
2262{
2263 struct vxlan_dev *vxlan = netdev_priv(dev);
205f356d 2264 int ret;
56ef9c90 2265
205f356d
JB		 2266 ret = vxlan_sock_add(vxlan);
2267 if (ret < 0)
2268 return ret;
d342894c 2269
79d4a94f 2270 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
56ef9c90 2271 ret = vxlan_igmp_join(vxlan);
bef0057b
MRL		 2272 if (ret == -EADDRINUSE)
2273 ret = 0;
56ef9c90 2274 if (ret) {
205f356d 2275 vxlan_sock_release(vxlan);
56ef9c90
MRL		 2276 return ret;
2277 }
d342894c 2278 }
2279
0dfbdf41 2280 if (vxlan->cfg.age_interval)
d342894c 2281 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2282
56ef9c90 2283 return ret;
d342894c 2284}
2285
2286/* Purge the forwarding table */
2287static void vxlan_flush(struct vxlan_dev *vxlan)
2288{
31fec5aa 2289 unsigned int h;
d342894c 2290
2291 spin_lock_bh(&vxlan->hash_lock);
2292 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2293 struct hlist_node *p, *n;
2294 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2295 struct vxlan_fdb *f
2296 = container_of(p, struct vxlan_fdb, hlist);
afbd8bae
MR		 2297 /* the all_zeros_mac entry is deleted at vxlan_uninit */
2298 if (!is_zero_ether_addr(f->eth_addr))
2299 vxlan_fdb_destroy(vxlan, f);
d342894c 2300 }
2301 }
2302 spin_unlock_bh(&vxlan->hash_lock);
2303}
2304
2305/* Cleanup timer and forwarding table on shutdown */
2306static int vxlan_stop(struct net_device *dev)
2307{
2308 struct vxlan_dev *vxlan = netdev_priv(dev);
f01ec1c0 2309 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
56ef9c90 2310 int ret = 0;
d342894c 2311
24c0e683 2312 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
f13b1689 2313 !vxlan_group_used(vn, vxlan))
56ef9c90 2314 ret = vxlan_igmp_leave(vxlan);
d342894c 2315
2316 del_timer_sync(&vxlan->age_timer);
2317
2318 vxlan_flush(vxlan);
205f356d 2319 vxlan_sock_release(vxlan);
d342894c 2320
56ef9c90 2321 return ret;
d342894c 2322}
2323
d342894c 2324/* Stub, nothing needs to be done. */
2325static void vxlan_set_multicast_list(struct net_device *dev)
2326{
2327}
2328
72564b59
DW		 2329static int __vxlan_change_mtu(struct net_device *dev,
2330 struct net_device *lowerdev,
2331 struct vxlan_rdst *dst, int new_mtu, bool strict)
345010b5 2332{
72564b59 2333 int max_mtu = IP_MAX_MTU;
345010b5 2334
72564b59
DW		 2335 if (lowerdev)
2336 max_mtu = lowerdev->mtu;
345010b5
DB		 2337
2338 if (dst->remote_ip.sa.sa_family == AF_INET6)
72564b59 2339 max_mtu -= VXLAN6_HEADROOM;
345010b5 2340 else
72564b59 2341 max_mtu -= VXLAN_HEADROOM;
345010b5 2342
72564b59 2343 if (new_mtu < 68)
345010b5
DB		 2344 return -EINVAL;
2345
72564b59
DW		 2346 if (new_mtu > max_mtu) {
2347 if (strict)
2348 return -EINVAL;
2349
2350 new_mtu = max_mtu;
2351 }
2352
345010b5
DB		 2353 dev->mtu = new_mtu;
2354 return 0;
2355}
2356
72564b59
DW		 2357static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2358{
2359 struct vxlan_dev *vxlan = netdev_priv(dev);
2360 struct vxlan_rdst *dst = &vxlan->default_dst;
2361 struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
2362 dst->remote_ifindex);
2363 return __vxlan_change_mtu(dev, lowerdev, dst, new_mtu, true);
2364}
2365
fc4099f1
PS		 2366static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
2367{
2368 struct vxlan_dev *vxlan = netdev_priv(dev);
2369 struct ip_tunnel_info *info = skb_tunnel_info(skb);
2370 __be16 sport, dport;
2371
2372 sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2373 vxlan->cfg.port_max, true);
2374 dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
2375
239e944f 2376 if (ip_tunnel_info_af(info) == AF_INET) {
1a8496ba
JB		 2377 struct rtable *rt;
2378
239e944f
JB		 2379 if (!vxlan->vn4_sock)
2380 return -EINVAL;
1a8496ba
JB		 2381 rt = vxlan_get_route(vxlan, skb, 0, info->key.tos,
2382 info->key.u.ipv4.dst,
0c1d70af 2383 &info->key.u.ipv4.src, NULL, info);
1a8496ba
JB		 2384 if (IS_ERR(rt))
2385 return PTR_ERR(rt);
2386 ip_rt_put(rt);
239e944f
JB		 2387 } else {
2388#if IS_ENABLED(CONFIG_IPV6)
2389 struct dst_entry *ndst;
2390
2391 if (!vxlan->vn6_sock)
2392 return -EINVAL;
1400615d 2393 ndst = vxlan6_get_route(vxlan, skb, 0, info->key.tos,
e7f70af1 2394 info->key.label, &info->key.u.ipv6.dst,
db3c6139 2395 &info->key.u.ipv6.src, NULL, info);
239e944f
JB		 2396 if (IS_ERR(ndst))
2397 return PTR_ERR(ndst);
2398 dst_release(ndst);
239e944f
JB		 2399#else /* !CONFIG_IPV6 */
2400 return -EPFNOSUPPORT;
2401#endif
2402 }
1a8496ba
JB		 2403 info->key.tp_src = sport;
2404 info->key.tp_dst = dport;
239e944f 2405 return 0;
fc4099f1
PS		 2406}
2407
d342894c 2408static const struct net_device_ops vxlan_netdev_ops = {
2409 .ndo_init = vxlan_init,
ebf4063e 2410 .ndo_uninit = vxlan_uninit,
d342894c 2411 .ndo_open = vxlan_open,
2412 .ndo_stop = vxlan_stop,
2413 .ndo_start_xmit = vxlan_xmit,
e8171045 2414 .ndo_get_stats64 = ip_tunnel_get_stats64,
d342894c 2415 .ndo_set_rx_mode = vxlan_set_multicast_list,
345010b5 2416 .ndo_change_mtu = vxlan_change_mtu,
d342894c 2417 .ndo_validate_addr = eth_validate_addr,
2418 .ndo_set_mac_address = eth_mac_addr,
2419 .ndo_fdb_add = vxlan_fdb_add,
2420 .ndo_fdb_del = vxlan_fdb_delete,
2421 .ndo_fdb_dump = vxlan_fdb_dump,
fc4099f1 2422 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
d342894c 2423};
2424
2425/* Info for udev, that this is a virtual tunnel endpoint */
2426static struct device_type vxlan_type = {
2427 .name = "vxlan",
2428};
2429
53cf5275 2430/* Calls the ndo_add_vxlan_port of the caller in order to
35e42379
JG		 2431 * supply the listening VXLAN udp ports. Callers are expected
2432 * to implement the ndo_add_vxlan_port.
53cf5275
JG		 2433 */
2434void vxlan_get_rx_port(struct net_device *dev)
2435{
2436 struct vxlan_sock *vs;
2437 struct net *net = dev_net(dev);
2438 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2439 sa_family_t sa_family;
35e42379
JG		 2440 __be16 port;
2441 unsigned int i;
53cf5275
JG		 2442
2443 spin_lock(&vn->sock_lock);
2444 for (i = 0; i < PORT_HASH_SIZE; ++i) {
35e42379
JG		 2445 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2446 port = inet_sk(vs->sock->sk)->inet_sport;
705cc62f 2447 sa_family = vxlan_get_sk_family(vs);
53cf5275
JG		 2448 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
2449 port);
2450 }
2451 }
2452 spin_unlock(&vn->sock_lock);
2453}
2454EXPORT_SYMBOL_GPL(vxlan_get_rx_port);
2455
d342894c 2456/* Initialize the device structure. */
2457static void vxlan_setup(struct net_device *dev)
2458{
2459 struct vxlan_dev *vxlan = netdev_priv(dev);
31fec5aa 2460 unsigned int h;
d342894c 2461
2462 eth_hw_addr_random(dev);
2463 ether_setup(dev);
2464
2465 dev->netdev_ops = &vxlan_netdev_ops;
ebf4063e 2466 dev->destructor = free_netdev;
d342894c 2467 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2468
d342894c 2469 dev->features |= NETIF_F_LLTX;
d6727fe3 2470 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
0afb1666 2471 dev->features |= NETIF_F_RXCSUM;
05c0db08 2472 dev->features |= NETIF_F_GSO_SOFTWARE;
0afb1666 2473
1eaa8178
PS		 2474 dev->vlan_features = dev->features;
2475 dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
0afb1666 2476 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
05c0db08 2477 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1eaa8178 2478 dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
02875878 2479 netif_keep_dst(dev);
82a0f6b4 2480 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
22dba393 2481 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
d342894c 2482
553675fb 2483 INIT_LIST_HEAD(&vxlan->next);
d342894c 2484 spin_lock_init(&vxlan->hash_lock);
2485
2486 init_timer_deferrable(&vxlan->age_timer);
2487 vxlan->age_timer.function = vxlan_cleanup;
2488 vxlan->age_timer.data = (unsigned long) vxlan;
2489
0dfbdf41 2490 vxlan->cfg.dst_port = htons(vxlan_port);
05f47d69 2491
d342894c 2492 vxlan->dev = dev;
2493
58ce31cc
TH		 2494 gro_cells_init(&vxlan->gro_cells, dev);
2495
d342894c 2496 for (h = 0; h < FDB_HASH_SIZE; ++h)
2497 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2498}
2499
2500static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2501 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
5d174dd8 2502 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
e4c7ed41 2503 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
d342894c 2504 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
2505 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
e4c7ed41 2506 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
d342894c 2507 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
2508 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
e7f70af1 2509 [IFLA_VXLAN_LABEL] = { .type = NLA_U32 },
d342894c 2510 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
2511 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
2512 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
05f47d69 2513 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
e4f67add
DS		 2514 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
2515 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
2516 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
2517 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
f8a9b1bc 2518 [IFLA_VXLAN_COLLECT_METADATA] = { .type = NLA_U8 },
823aa873 2519 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
5c91ae08
TH		 2520 [IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 },
2521 [IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
2522 [IFLA_VXLAN_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
dfd8645e
TH		 2523 [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2524 [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
3511494c 2525 [IFLA_VXLAN_GBP] = { .type = NLA_FLAG, },
0ace2ca8 2526 [IFLA_VXLAN_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG },
d342894c 2527};
2528
2529static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2530{
2531 if (tb[IFLA_ADDRESS]) {
2532 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2533 pr_debug("invalid link address (not ethernet)\n");
2534 return -EINVAL;
2535 }
2536
2537 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2538 pr_debug("invalid all zero ethernet address\n");
2539 return -EADDRNOTAVAIL;
2540 }
2541 }
2542
2543 if (!data)
2544 return -EINVAL;
2545
2546 if (data[IFLA_VXLAN_ID]) {
2547 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2548 if (id >= VXLAN_VID_MASK)
2549 return -ERANGE;
2550 }
2551
05f47d69 2552 if (data[IFLA_VXLAN_PORT_RANGE]) {
2553 const struct ifla_vxlan_port_range *p
2554 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2555
2556 if (ntohs(p->high) < ntohs(p->low)) {
2557 pr_debug("port range %u .. %u not valid\n",
2558 ntohs(p->low), ntohs(p->high));
2559 return -EINVAL;
2560 }
2561 }
2562
d342894c 2563 return 0;
2564}
2565
1b13c97f
YB		 2566static void vxlan_get_drvinfo(struct net_device *netdev,
2567 struct ethtool_drvinfo *drvinfo)
2568{
2569 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2570 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2571}
2572
2573static const struct ethtool_ops vxlan_ethtool_ops = {
2574 .get_drvinfo = vxlan_get_drvinfo,
2575 .get_link = ethtool_op_get_link,
2576};
2577
553675fb 2578static void vxlan_del_work(struct work_struct *work)
2579{
2580 struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
acbf74a7 2581 udp_tunnel_sock_release(vs->sock);
553675fb 2582 kfree_rcu(vs, rcu);
2583}
2584
3ee64f39
TH		 2585static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2586 __be16 port, u32 flags)
553675fb 2587{
e4c7ed41 2588 struct socket *sock;
3ee64f39
TH		 2589 struct udp_port_cfg udp_conf;
2590 int err;
e4c7ed41 2591
3ee64f39 2592 memset(&udp_conf, 0, sizeof(udp_conf));
e4c7ed41 2593
3ee64f39
TH		 2594 if (ipv6) {
2595 udp_conf.family = AF_INET6;
3ee64f39 2596 udp_conf.use_udp6_rx_checksums =
3dc2b6a8 2597 !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
a43a9ef6 2598 udp_conf.ipv6_v6only = 1;
3ee64f39
TH		 2599 } else {
2600 udp_conf.family = AF_INET;
e4c7ed41 2601 }
e4c7ed41 2602
3ee64f39 2603 udp_conf.local_udp_port = port;
553675fb 2604
3ee64f39
TH		 2605 /* Open UDP socket */
2606 err = udp_sock_create(net, &udp_conf, &sock);
2607 if (err < 0)
2608 return ERR_PTR(err);
e4c7ed41 2609
39deb2c7 2610 return sock;
e4c7ed41
CW		 2611}
2612
2613/* Create new listen socket if needed */
b1be00a6
JB		 2614static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
2615 __be16 port, u32 flags)
e4c7ed41
CW		 2616{
2617 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2618 struct vxlan_sock *vs;
2619 struct socket *sock;
e4c7ed41 2620 unsigned int h;
acbf74a7 2621 struct udp_tunnel_sock_cfg tunnel_cfg;
e4c7ed41 2622
dc01e7d3 2623 vs = kzalloc(sizeof(*vs), GFP_KERNEL);
e4c7ed41
CW		 2624 if (!vs)
2625 return ERR_PTR(-ENOMEM);
2626
2627 for (h = 0; h < VNI_HASH_SIZE; ++h)
2628 INIT_HLIST_HEAD(&vs->vni_list[h]);
2629
2630 INIT_WORK(&vs->del_work, vxlan_del_work);
2631
3ee64f39 2632 sock = vxlan_create_sock(net, ipv6, port, flags);
39deb2c7 2633 if (IS_ERR(sock)) {
56ef9c90
MRL		 2634 pr_info("Cannot bind port %d, err=%ld\n", ntohs(port),
2635 PTR_ERR(sock));
553675fb 2636 kfree(vs);
e50fddc8 2637 return ERR_CAST(sock);
553675fb 2638 }
e4c7ed41
CW		 2639
2640 vs->sock = sock;
9c2e24e1 2641 atomic_set(&vs->refcnt, 1);
af33c1ad 2642 vs->flags = (flags & VXLAN_F_RCV_FLAGS);
553675fb 2643
dc01e7d3
OG		 2644 /* Initialize the vxlan udp offloads structure */
2645 vs->udp_offloads.port = port;
2646 vs->udp_offloads.callbacks.gro_receive = vxlan_gro_receive;
2647 vs->udp_offloads.callbacks.gro_complete = vxlan_gro_complete;
2648
9c2e24e1
PS		 2649 spin_lock(&vn->sock_lock);
2650 hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
dc01e7d3 2651 vxlan_notify_add_rx_port(vs);
9c2e24e1 2652 spin_unlock(&vn->sock_lock);
553675fb 2653
2654 /* Mark socket as an encapsulation socket. */
acbf74a7
AZ		 2655 tunnel_cfg.sk_user_data = vs;
2656 tunnel_cfg.encap_type = 1;
f2d1968e 2657 tunnel_cfg.encap_rcv = vxlan_rcv;
acbf74a7
AZ		 2658 tunnel_cfg.encap_destroy = NULL;
2659
2660 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
e4c7ed41 2661
9c2e24e1
PS		 2662 return vs;
2663}
2664
b1be00a6 2665static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
9c2e24e1 2666{
205f356d
JB		 2667 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2668 struct vxlan_sock *vs = NULL;
9c2e24e1 2669
205f356d 2670 if (!vxlan->cfg.no_share) {
56ef9c90 2671 spin_lock(&vn->sock_lock);
205f356d
JB		 2672 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
2673 vxlan->cfg.dst_port, vxlan->flags);
2674 if (vs && !atomic_add_unless(&vs->refcnt, 1, 0)) {
56ef9c90 2675 spin_unlock(&vn->sock_lock);
205f356d 2676 return -EBUSY;
56ef9c90
MRL		 2677 }
2678 spin_unlock(&vn->sock_lock);
2679 }
205f356d 2680 if (!vs)
b1be00a6
JB		 2681 vs = vxlan_socket_create(vxlan->net, ipv6,
2682 vxlan->cfg.dst_port, vxlan->flags);
205f356d
JB		 2683 if (IS_ERR(vs))
2684 return PTR_ERR(vs);
b1be00a6
JB		 2685#if IS_ENABLED(CONFIG_IPV6)
2686 if (ipv6)
2687 vxlan->vn6_sock = vs;
2688 else
2689#endif
2690 vxlan->vn4_sock = vs;
205f356d
JB		 2691 vxlan_vs_add_dev(vs, vxlan);
2692 return 0;
553675fb 2693}
2694
b1be00a6
JB		 2695static int vxlan_sock_add(struct vxlan_dev *vxlan)
2696{
2697 bool ipv6 = vxlan->flags & VXLAN_F_IPV6;
2698 bool metadata = vxlan->flags & VXLAN_F_COLLECT_METADATA;
2699 int ret = 0;
2700
2701 vxlan->vn4_sock = NULL;
2702#if IS_ENABLED(CONFIG_IPV6)
2703 vxlan->vn6_sock = NULL;
2704 if (ipv6 || metadata)
2705 ret = __vxlan_sock_add(vxlan, true);
2706#endif
2707 if (!ret && (!ipv6 || metadata))
2708 ret = __vxlan_sock_add(vxlan, false);
2709 if (ret < 0)
2710 vxlan_sock_release(vxlan);
2711 return ret;
2712}
2713
0dfbdf41
TG		 2714static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
2715 struct vxlan_config *conf)
d342894c 2716{
33564bbb 2717 struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
07b9b37c 2718 struct vxlan_dev *vxlan = netdev_priv(dev), *tmp;
c7995c43 2719 struct vxlan_rdst *dst = &vxlan->default_dst;
b1be00a6 2720 unsigned short needed_headroom = ETH_HLEN;
d342894c 2721 int err;
e4c7ed41 2722 bool use_ipv6 = false;
0dfbdf41 2723 __be16 default_port = vxlan->cfg.dst_port;
7e059158 2724 struct net_device *lowerdev = NULL;
d342894c 2725
33564bbb 2726 vxlan->net = src_net;
f01ec1c0 2727
0dfbdf41 2728 dst->remote_vni = conf->vni;
d342894c 2729
0dfbdf41 2730 memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
d342894c 2731
0dfbdf41
TG		 2732 /* Unless IPv6 is explicitly requested, assume IPv4 */
2733 if (!dst->remote_ip.sa.sa_family)
2734 dst->remote_ip.sa.sa_family = AF_INET;
e4c7ed41 2735
0dfbdf41 2736 if (dst->remote_ip.sa.sa_family == AF_INET6 ||
057ba29b
JB		 2737 vxlan->cfg.saddr.sa.sa_family == AF_INET6) {
2738 if (!IS_ENABLED(CONFIG_IPV6))
2739 return -EPFNOSUPPORT;
e4c7ed41 2740 use_ipv6 = true;
b1be00a6 2741 vxlan->flags |= VXLAN_F_IPV6;
057ba29b 2742 }
d342894c 2743
e7f70af1
DB		 2744 if (conf->label && !use_ipv6) {
2745 pr_info("label only supported in use with IPv6\n");
2746 return -EINVAL;
2747 }
2748
0dfbdf41 2749 if (conf->remote_ifindex) {
7e059158 2750 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
0dfbdf41 2751 dst->remote_ifindex = conf->remote_ifindex;
34e02aa1 2752
2753 if (!lowerdev) {
c7995c43 2754 pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
34e02aa1 2755 return -ENODEV;
2756 }
d342894c 2757
e4c7ed41
CW		 2758#if IS_ENABLED(CONFIG_IPV6)
2759 if (use_ipv6) {
2760 struct inet6_dev *idev = __in6_dev_get(lowerdev);
2761 if (idev && idev->cnf.disable_ipv6) {
2762 pr_info("IPv6 is disabled via sysctl\n");
2763 return -EPERM;
2764 }
e4c7ed41
CW		 2765 }
2766#endif
2767
0dfbdf41 2768 if (!conf->mtu)
e4c7ed41 2769 dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
1ba56fb4 2770
b1be00a6 2771 needed_headroom = lowerdev->hard_header_len;
9dc2ad10 2772 }
d342894c 2773
7e059158
DW		 2774 if (conf->mtu) {
2775 err = __vxlan_change_mtu(dev, lowerdev, dst, conf->mtu, false);
2776 if (err)
2777 return err;
2778 }
2779
b1be00a6
JB		 2780 if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
2781 needed_headroom += VXLAN6_HEADROOM;
2782 else
2783 needed_headroom += VXLAN_HEADROOM;
2784 dev->needed_headroom = needed_headroom;
2785
0dfbdf41
TG		 2786 memcpy(&vxlan->cfg, conf, sizeof(*conf));
2787 if (!vxlan->cfg.dst_port)
2788 vxlan->cfg.dst_port = default_port;
2789 vxlan->flags |= conf->flags;
2790
2791 if (!vxlan->cfg.age_interval)
2792 vxlan->cfg.age_interval = FDB_AGE_DEFAULT;
2793
07b9b37c
ND		 2794 list_for_each_entry(tmp, &vn->vxlan_list, next) {
2795 if (tmp->cfg.vni == conf->vni &&
2796 (tmp->default_dst.remote_ip.sa.sa_family == AF_INET6 ||
2797 tmp->cfg.saddr.sa.sa_family == AF_INET6) == use_ipv6 &&
2798 tmp->cfg.dst_port == vxlan->cfg.dst_port &&
2799 (tmp->flags & VXLAN_F_RCV_FLAGS) ==
2800 (vxlan->flags & VXLAN_F_RCV_FLAGS))
0dfbdf41 2801 return -EEXIST;
07b9b37c 2802 }
0dfbdf41
TG		 2803
2804 dev->ethtool_ops = &vxlan_ethtool_ops;
2805
2806 /* create an fdb entry for a valid default destination */
2807 if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2808 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2809 &vxlan->default_dst.remote_ip,
2810 NUD_REACHABLE|NUD_PERMANENT,
2811 NLM_F_EXCL|NLM_F_CREATE,
2812 vxlan->cfg.dst_port,
2813 vxlan->default_dst.remote_vni,
2814 vxlan->default_dst.remote_ifindex,
2815 NTF_SELF);
2816 if (err)
2817 return err;
2818 }
2819
2820 err = register_netdevice(dev);
2821 if (err) {
2822 vxlan_fdb_delete_default(vxlan);
2823 return err;
2824 }
2825
2826 list_add(&vxlan->next, &vn->vxlan_list);
2827
2828 return 0;
2829}
2830
2831struct net_device *vxlan_dev_create(struct net *net, const char *name,
2832 u8 name_assign_type, struct vxlan_config *conf)
2833{
2834 struct nlattr *tb[IFLA_MAX+1];
2835 struct net_device *dev;
2836 int err;
2837
2838 memset(&tb, 0, sizeof(tb));
2839
2840 dev = rtnl_create_link(net, name, name_assign_type,
2841 &vxlan_link_ops, tb);
2842 if (IS_ERR(dev))
2843 return dev;
2844
2845 err = vxlan_dev_configure(net, dev, conf);
2846 if (err < 0) {
2847 free_netdev(dev);
2848 return ERR_PTR(err);
2849 }
2850
2851 return dev;
2852}
2853EXPORT_SYMBOL_GPL(vxlan_dev_create);
2854
2855static int vxlan_newlink(struct net *src_net, struct net_device *dev,
2856 struct nlattr *tb[], struct nlattr *data[])
2857{
2858 struct vxlan_config conf;
2859 int err;
2860
0dfbdf41 2861 memset(&conf, 0, sizeof(conf));
e277de5f
JG		 2862
2863 if (data[IFLA_VXLAN_ID])
54bfd872 2864 conf.vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
0dfbdf41
TG		 2865
2866 if (data[IFLA_VXLAN_GROUP]) {
2867 conf.remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
2868 } else if (data[IFLA_VXLAN_GROUP6]) {
2869 if (!IS_ENABLED(CONFIG_IPV6))
2870 return -EPFNOSUPPORT;
2871
2872 conf.remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
2873 conf.remote_ip.sa.sa_family = AF_INET6;
2874 }
2875
2876 if (data[IFLA_VXLAN_LOCAL]) {
2877 conf.saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
2878 conf.saddr.sa.sa_family = AF_INET;
2879 } else if (data[IFLA_VXLAN_LOCAL6]) {
2880 if (!IS_ENABLED(CONFIG_IPV6))
2881 return -EPFNOSUPPORT;
2882
2883 /* TODO: respect scope id */
2884 conf.saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
2885 conf.saddr.sa.sa_family = AF_INET6;
2886 }
2887
2888 if (data[IFLA_VXLAN_LINK])
2889 conf.remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
2890
d342894c 2891 if (data[IFLA_VXLAN_TOS])
0dfbdf41 2892 conf.tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
d342894c 2893
afb97186 2894 if (data[IFLA_VXLAN_TTL])
0dfbdf41 2895 conf.ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
afb97186 2896
e7f70af1
DB		 2897 if (data[IFLA_VXLAN_LABEL])
2898 conf.label = nla_get_be32(data[IFLA_VXLAN_LABEL]) &
2899 IPV6_FLOWLABEL_MASK;
2900
d342894c 2901 if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
0dfbdf41 2902 conf.flags |= VXLAN_F_LEARN;
d342894c 2903
2904 if (data[IFLA_VXLAN_AGEING])
0dfbdf41 2905 conf.age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
d342894c 2906
e4f67add 2907 if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
0dfbdf41 2908 conf.flags |= VXLAN_F_PROXY;
e4f67add
DS		 2909
2910 if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
0dfbdf41 2911 conf.flags |= VXLAN_F_RSC;
e4f67add
DS		 2912
2913 if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
0dfbdf41 2914 conf.flags |= VXLAN_F_L2MISS;
e4f67add
DS		 2915
2916 if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
0dfbdf41 2917 conf.flags |= VXLAN_F_L3MISS;
e4f67add 2918
d342894c 2919 if (data[IFLA_VXLAN_LIMIT])
0dfbdf41 2920 conf.addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
d342894c 2921
f8a9b1bc
AS		 2922 if (data[IFLA_VXLAN_COLLECT_METADATA] &&
2923 nla_get_u8(data[IFLA_VXLAN_COLLECT_METADATA]))
2924 conf.flags |= VXLAN_F_COLLECT_METADATA;
2925
05f47d69 2926 if (data[IFLA_VXLAN_PORT_RANGE]) {
2927 const struct ifla_vxlan_port_range *p
2928 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
0dfbdf41
TG		 2929 conf.port_min = ntohs(p->low);
2930 conf.port_max = ntohs(p->high);
05f47d69 2931 }
2932
823aa873 2933 if (data[IFLA_VXLAN_PORT])
0dfbdf41 2934 conf.dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
823aa873 2935
6ceb31ca
AD		 2936 if (data[IFLA_VXLAN_UDP_CSUM] &&
2937 !nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
2938 conf.flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
359a0ea9
TH		 2939
2940 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
2941 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
0dfbdf41 2942 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
359a0ea9
TH		 2943
2944 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
2945 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
0dfbdf41 2946 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
359a0ea9 2947
dfd8645e
TH		 2948 if (data[IFLA_VXLAN_REMCSUM_TX] &&
2949 nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
0dfbdf41 2950 conf.flags |= VXLAN_F_REMCSUM_TX;
dfd8645e
TH		 2951
2952 if (data[IFLA_VXLAN_REMCSUM_RX] &&
2953 nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
0dfbdf41 2954 conf.flags |= VXLAN_F_REMCSUM_RX;
dfd8645e 2955
3511494c 2956 if (data[IFLA_VXLAN_GBP])
0dfbdf41 2957 conf.flags |= VXLAN_F_GBP;
3511494c 2958
0ace2ca8 2959 if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL])
0dfbdf41 2960 conf.flags |= VXLAN_F_REMCSUM_NOPARTIAL;
0ace2ca8 2961
0dfbdf41
TG		 2962 err = vxlan_dev_configure(src_net, dev, &conf);
2963 switch (err) {
2964 case -ENODEV:
2965 pr_info("ifindex %d does not exist\n", conf.remote_ifindex);
2966 break;
1b13c97f 2967
0dfbdf41
TG		 2968 case -EPERM:
2969 pr_info("IPv6 is disabled via sysctl\n");
2970 break;
d342894c 2971
0dfbdf41 2972 case -EEXIST:
54bfd872 2973 pr_info("duplicate VNI %u\n", be32_to_cpu(conf.vni));
0dfbdf41 2974 break;
afbd8bae
MR		 2975 }
2976
0dfbdf41 2977 return err;
d342894c 2978}
2979
2980static void vxlan_dellink(struct net_device *dev, struct list_head *head)
2981{
2982 struct vxlan_dev *vxlan = netdev_priv(dev);
f01ec1c0 2983 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
d342894c 2984
fe5c3561 2985 spin_lock(&vn->sock_lock);
9c2e24e1
PS		 2986 if (!hlist_unhashed(&vxlan->hlist))
2987 hlist_del_rcu(&vxlan->hlist);
fe5c3561 2988 spin_unlock(&vn->sock_lock);
2989
58ce31cc 2990 gro_cells_destroy(&vxlan->gro_cells);
553675fb 2991 list_del(&vxlan->next);
d342894c 2992 unregister_netdevice_queue(dev, head);
2993}
2994
2995static size_t vxlan_get_size(const struct net_device *dev)
2996{
2997
2998 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
e4c7ed41 2999 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
d342894c 3000 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
e4c7ed41 3001 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
d342894c 3002 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
3003 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
e7f70af1 3004 nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */
d342894c 3005 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
e4f67add
DS		 3006 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
3007 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
3008 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
3009 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
da8b43c0 3010 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_COLLECT_METADATA */
d342894c 3011 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
3012 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
05f47d69 3013 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
359a0ea9
TH		 3014 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
3015 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
3016 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
3017 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
dfd8645e
TH		 3018 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
3019 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
d342894c 3020 0;
3021}
3022
3023static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
3024{
3025 const struct vxlan_dev *vxlan = netdev_priv(dev);
c7995c43 3026 const struct vxlan_rdst *dst = &vxlan->default_dst;
05f47d69 3027 struct ifla_vxlan_port_range ports = {
0dfbdf41
TG		 3028 .low = htons(vxlan->cfg.port_min),
3029 .high = htons(vxlan->cfg.port_max),
05f47d69 3030 };
d342894c 3031
54bfd872 3032 if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni)))
d342894c 3033 goto nla_put_failure;
3034
e4c7ed41
CW		 3035 if (!vxlan_addr_any(&dst->remote_ip)) {
3036 if (dst->remote_ip.sa.sa_family == AF_INET) {
930345ea
JB		 3037 if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
3038 dst->remote_ip.sin.sin_addr.s_addr))
e4c7ed41
CW		 3039 goto nla_put_failure;
3040#if IS_ENABLED(CONFIG_IPV6)
3041 } else {
930345ea
JB		 3042 if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
3043 &dst->remote_ip.sin6.sin6_addr))
e4c7ed41
CW		 3044 goto nla_put_failure;
3045#endif
3046 }
3047 }
d342894c 3048
c7995c43 3049 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
d342894c 3050 goto nla_put_failure;
3051
0dfbdf41
TG		 3052 if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
3053 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
930345ea 3054 if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
0dfbdf41 3055 vxlan->cfg.saddr.sin.sin_addr.s_addr))
e4c7ed41
CW		 3056 goto nla_put_failure;
3057#if IS_ENABLED(CONFIG_IPV6)
3058 } else {
930345ea 3059 if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
0dfbdf41 3060 &vxlan->cfg.saddr.sin6.sin6_addr))
e4c7ed41
CW		 3061 goto nla_put_failure;
3062#endif
3063 }
3064 }
d342894c 3065
0dfbdf41
TG		 3066 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
3067 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
e7f70af1 3068 nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) ||
e4f67add
DS		 3069 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
3070 !!(vxlan->flags & VXLAN_F_LEARN)) ||
3071 nla_put_u8(skb, IFLA_VXLAN_PROXY,
3072 !!(vxlan->flags & VXLAN_F_PROXY)) ||
3073 nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
3074 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
3075 !!(vxlan->flags & VXLAN_F_L2MISS)) ||
3076 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
3077 !!(vxlan->flags & VXLAN_F_L3MISS)) ||
da8b43c0
AS		 3078 nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
3079 !!(vxlan->flags & VXLAN_F_COLLECT_METADATA)) ||
0dfbdf41
TG		 3080 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
3081 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
3082 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
359a0ea9 3083 nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
6ceb31ca 3084 !(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
359a0ea9
TH		 3085 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
3086 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
3087 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
dfd8645e
TH		 3088 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
3089 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
3090 !!(vxlan->flags & VXLAN_F_REMCSUM_TX)) ||
3091 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
3092 !!(vxlan->flags & VXLAN_F_REMCSUM_RX)))
d342894c 3093 goto nla_put_failure;
3094
05f47d69 3095 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
3096 goto nla_put_failure;
3097
3511494c
TG		 3098 if (vxlan->flags & VXLAN_F_GBP &&
3099 nla_put_flag(skb, IFLA_VXLAN_GBP))
3100 goto nla_put_failure;
3101
0ace2ca8
TH		 3102 if (vxlan->flags & VXLAN_F_REMCSUM_NOPARTIAL &&
3103 nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
3104 goto nla_put_failure;
3105
d342894c 3106 return 0;
3107
3108nla_put_failure:
3109 return -EMSGSIZE;
3110}
3111
1728d4fa
ND		 3112static struct net *vxlan_get_link_net(const struct net_device *dev)
3113{
3114 struct vxlan_dev *vxlan = netdev_priv(dev);
3115
3116 return vxlan->net;
3117}
3118
d342894c 3119static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
3120 .kind = "vxlan",
3121 .maxtype = IFLA_VXLAN_MAX,
3122 .policy = vxlan_policy,
3123 .priv_size = sizeof(struct vxlan_dev),
3124 .setup = vxlan_setup,
3125 .validate = vxlan_validate,
3126 .newlink = vxlan_newlink,
3127 .dellink = vxlan_dellink,
3128 .get_size = vxlan_get_size,
3129 .fill_info = vxlan_fill_info,
1728d4fa 3130 .get_link_net = vxlan_get_link_net,
d342894c 3131};
3132
acaf4e70
DB		 3133static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
3134 struct net_device *dev)
3135{
3136 struct vxlan_dev *vxlan, *next;
3137 LIST_HEAD(list_kill);
3138
3139 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3140 struct vxlan_rdst *dst = &vxlan->default_dst;
3141
3142 /* In case we created vxlan device with carrier
3143 * and we loose the carrier due to module unload
3144 * we also need to remove vxlan device. In other
3145 * cases, it's not necessary and remote_ifindex
3146 * is 0 here, so no matches.
3147 */
3148 if (dst->remote_ifindex == dev->ifindex)
3149 vxlan_dellink(vxlan->dev, &list_kill);
3150 }
3151
3152 unregister_netdevice_many(&list_kill);
3153}
3154
3155static int vxlan_lowerdev_event(struct notifier_block *unused,
3156 unsigned long event, void *ptr)
3157{
3158 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
783c1463 3159 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
acaf4e70 3160
783c1463 3161 if (event == NETDEV_UNREGISTER)
acaf4e70
DB		 3162 vxlan_handle_lowerdev_unregister(vn, dev);
3163
3164 return NOTIFY_DONE;
3165}
3166
3167static struct notifier_block vxlan_notifier_block __read_mostly = {
3168 .notifier_call = vxlan_lowerdev_event,
3169};
3170
d342894c 3171static __net_init int vxlan_init_net(struct net *net)
3172{
3173 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
31fec5aa 3174 unsigned int h;
d342894c 3175
553675fb 3176 INIT_LIST_HEAD(&vn->vxlan_list);
1c51a915 3177 spin_lock_init(&vn->sock_lock);
d342894c 3178
553675fb 3179 for (h = 0; h < PORT_HASH_SIZE; ++h)
3180 INIT_HLIST_HEAD(&vn->sock_list[h]);
d342894c 3181
3182 return 0;
3183}
3184
f01ec1c0
ND		 3185static void __net_exit vxlan_exit_net(struct net *net)
3186{
3187 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3188 struct vxlan_dev *vxlan, *next;
3189 struct net_device *dev, *aux;
3190 LIST_HEAD(list);
3191
3192 rtnl_lock();
3193 for_each_netdev_safe(net, dev, aux)
3194 if (dev->rtnl_link_ops == &vxlan_link_ops)
3195 unregister_netdevice_queue(dev, &list);
3196
3197 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3198 /* If vxlan->dev is in the same netns, it has already been added
3199 * to the list by the previous loop.
3200 */
58ce31cc
TH		 3201 if (!net_eq(dev_net(vxlan->dev), net)) {
3202 gro_cells_destroy(&vxlan->gro_cells);
13c3ed6a 3203 unregister_netdevice_queue(vxlan->dev, &list);
58ce31cc 3204 }
f01ec1c0
ND		 3205 }
3206
3207 unregister_netdevice_many(&list);
3208 rtnl_unlock();
3209}
3210
d342894c 3211static struct pernet_operations vxlan_net_ops = {
3212 .init = vxlan_init_net,
f01ec1c0 3213 .exit = vxlan_exit_net,
d342894c 3214 .id = &vxlan_net_id,
3215 .size = sizeof(struct vxlan_net),
3216};
3217
3218static int __init vxlan_init_module(void)
3219{
3220 int rc;
3221
758c57d1
SH		 3222 vxlan_wq = alloc_workqueue("vxlan", 0, 0);
3223 if (!vxlan_wq)
3224 return -ENOMEM;
3225
d342894c 3226 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
3227
783c1463 3228 rc = register_pernet_subsys(&vxlan_net_ops);
d342894c 3229 if (rc)
3230 goto out1;
3231
acaf4e70 3232 rc = register_netdevice_notifier(&vxlan_notifier_block);
d342894c 3233 if (rc)
3234 goto out2;
3235
acaf4e70
DB		 3236 rc = rtnl_link_register(&vxlan_link_ops);
3237 if (rc)
3238 goto out3;
d342894c 3239
acaf4e70
DB		 3240 return 0;
3241out3:
3242 unregister_netdevice_notifier(&vxlan_notifier_block);
d342894c 3243out2:
783c1463 3244 unregister_pernet_subsys(&vxlan_net_ops);
d342894c 3245out1:
758c57d1 3246 destroy_workqueue(vxlan_wq);
d342894c 3247 return rc;
3248}
7332a13b 3249late_initcall(vxlan_init_module);
d342894c 3250
3251static void __exit vxlan_cleanup_module(void)
3252{
b7153984 3253 rtnl_link_unregister(&vxlan_link_ops);
acaf4e70 3254 unregister_netdevice_notifier(&vxlan_notifier_block);
758c57d1 3255 destroy_workqueue(vxlan_wq);
783c1463
DB		 3256 unregister_pernet_subsys(&vxlan_net_ops);
3257 /* rcu_barrier() is called by netns */
d342894c 3258}
3259module_exit(vxlan_cleanup_module);
3260
3261MODULE_LICENSE("GPL");
3262MODULE_VERSION(VXLAN_VERSION);
3b8df3c6 3263MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
ead5139a 3264MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
d342894c 3265MODULE_ALIAS_RTNL_LINK("vxlan");
Linux 6.x block layer and io_uring tree(s)