]> git.proxmox.com Git - mirror_ubuntu-focal-kernel.git/blame - drivers/net/vxlan.c
projects / mirror_ubuntu-focal-kernel.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
vxlan: Inline vxlan_gso_check().
[mirror_ubuntu-focal-kernel.git] / drivers / net / vxlan.c
CommitLineData
d342894c 1/*
eb5ce439 2 * VXLAN: Virtual eXtensible Local Area Network
d342894c 3 *
3b8df3c6 4 * Copyright (c) 2012-2013 Vyatta Inc.
d342894c 5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
d342894c 9 */
10
11#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13#include <linux/kernel.h>
14#include <linux/types.h>
15#include <linux/module.h>
16#include <linux/errno.h>
17#include <linux/slab.h>
18#include <linux/skbuff.h>
19#include <linux/rculist.h>
20#include <linux/netdevice.h>
21#include <linux/in.h>
22#include <linux/ip.h>
23#include <linux/udp.h>
24#include <linux/igmp.h>
25#include <linux/etherdevice.h>
26#include <linux/if_ether.h>
1eaa8178 27#include <linux/if_vlan.h>
d342894c 28#include <linux/hash.h>
1b13c97f 29#include <linux/ethtool.h>
e4f67add
DS		 30#include <net/arp.h>
31#include <net/ndisc.h>
d342894c 32#include <net/ip.h>
c5441932 33#include <net/ip_tunnels.h>
d342894c 34#include <net/icmp.h>
35#include <net/udp.h>
3ee64f39 36#include <net/udp_tunnel.h>
d342894c 37#include <net/rtnetlink.h>
38#include <net/route.h>
39#include <net/dsfield.h>
40#include <net/inet_ecn.h>
41#include <net/net_namespace.h>
42#include <net/netns/generic.h>
012a5729 43#include <net/vxlan.h>
dc01e7d3 44#include <net/protocol.h>
acbf74a7 45#include <net/udp_tunnel.h>
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
d342894c 52
53#define VXLAN_VERSION "0.1"
54
553675fb 55#define PORT_HASH_BITS 8
56#define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
d342894c 57#define VNI_HASH_BITS 10
58#define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
59#define FDB_HASH_BITS 8
60#define FDB_HASH_SIZE (1<<FDB_HASH_BITS)
61#define FDB_AGE_DEFAULT 300 /* 5 min */
62#define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
63
64#define VXLAN_N_VID (1u << 24)
65#define VXLAN_VID_MASK (VXLAN_N_VID - 1)
7ce04758 66#define VXLAN_HLEN (sizeof(struct udphdr) + sizeof(struct vxlanhdr))
d342894c 67
68#define VXLAN_FLAGS 0x08000000 /* struct vxlanhdr.vx_flags required value. */
69
23c578bf 70/* UDP port for VXLAN traffic.
71 * The IANA assigned port is 4789, but the Linux default is 8472
234f5b73 72 * for compatibility with early adopters.
23c578bf 73 */
9daaa397
SH		 74static unsigned short vxlan_port __read_mostly = 8472;
75module_param_named(udp_port, vxlan_port, ushort, 0444);
d342894c 76MODULE_PARM_DESC(udp_port, "Destination UDP port");
77
78static bool log_ecn_error = true;
79module_param(log_ecn_error, bool, 0644);
80MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
81
60d9d4c6 82static int vxlan_net_id;
553675fb 83
afbd8bae
MR		 84static const u8 all_zeros_mac[ETH_ALEN];
85
553675fb 86/* per-network namespace private data for this module */
87struct vxlan_net {
88 struct list_head vxlan_list;
89 struct hlist_head sock_list[PORT_HASH_SIZE];
1c51a915 90 spinlock_t sock_lock;
553675fb 91};
92
e4c7ed41
CW		 93union vxlan_addr {
94 struct sockaddr_in sin;
95 struct sockaddr_in6 sin6;
96 struct sockaddr sa;
97};
98
6681712d 99struct vxlan_rdst {
e4c7ed41 100 union vxlan_addr remote_ip;
6681712d
DS		 101 __be16 remote_port;
102 u32 remote_vni;
103 u32 remote_ifindex;
3e61aa8f 104 struct list_head list;
bc7892ba 105 struct rcu_head rcu;
6681712d
DS		 106};
107
d342894c 108/* Forwarding table entry */
109struct vxlan_fdb {
110 struct hlist_node hlist; /* linked list of entries */
111 struct rcu_head rcu;
112 unsigned long updated; /* jiffies */
113 unsigned long used;
3e61aa8f 114 struct list_head remotes;
d342894c 115 u16 state; /* see ndm_state */
ae884082 116 u8 flags; /* see ndm_flags */
d342894c 117 u8 eth_addr[ETH_ALEN];
118};
119
d342894c 120/* Pseudo network device */
121struct vxlan_dev {
553675fb 122 struct hlist_node hlist; /* vni hash table */
123 struct list_head next; /* vxlan's per namespace list */
124 struct vxlan_sock *vn_sock; /* listening socket */
d342894c 125 struct net_device *dev;
f01ec1c0 126 struct net *net; /* netns for packet i/o */
c7995c43 127 struct vxlan_rdst default_dst; /* default destination */
e4c7ed41 128 union vxlan_addr saddr; /* source address */
823aa873 129 __be16 dst_port;
05f47d69 130 __u16 port_min; /* source port range */
131 __u16 port_max;
d342894c 132 __u8 tos; /* TOS override */
133 __u8 ttl;
359a0ea9 134 u32 flags; /* VXLAN_F_* in vxlan.h */
d342894c 135
1c51a915 136 struct work_struct sock_work;
3fc2de2f 137 struct work_struct igmp_join;
138 struct work_struct igmp_leave;
1c51a915 139
d342894c 140 unsigned long age_interval;
141 struct timer_list age_timer;
142 spinlock_t hash_lock;
143 unsigned int addrcnt;
144 unsigned int addrmax;
d342894c 145
146 struct hlist_head fdb_head[FDB_HASH_SIZE];
147};
148
149/* salt for hash table */
150static u32 vxlan_salt __read_mostly;
758c57d1 151static struct workqueue_struct *vxlan_wq;
d342894c 152
1c51a915
SH		 153static void vxlan_sock_work(struct work_struct *work);
154
e4c7ed41
CW		 155#if IS_ENABLED(CONFIG_IPV6)
156static inline
157bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
158{
159 if (a->sa.sa_family != b->sa.sa_family)
160 return false;
161 if (a->sa.sa_family == AF_INET6)
162 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
163 else
164 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
165}
166
167static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
168{
169 if (ipa->sa.sa_family == AF_INET6)
170 return ipv6_addr_any(&ipa->sin6.sin6_addr);
171 else
172 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
173}
174
175static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
176{
177 if (ipa->sa.sa_family == AF_INET6)
178 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
179 else
180 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
181}
182
183static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
184{
185 if (nla_len(nla) >= sizeof(struct in6_addr)) {
186 nla_memcpy(&ip->sin6.sin6_addr, nla, sizeof(struct in6_addr));
187 ip->sa.sa_family = AF_INET6;
188 return 0;
189 } else if (nla_len(nla) >= sizeof(__be32)) {
190 ip->sin.sin_addr.s_addr = nla_get_be32(nla);
191 ip->sa.sa_family = AF_INET;
192 return 0;
193 } else {
194 return -EAFNOSUPPORT;
195 }
196}
197
198static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
199 const union vxlan_addr *ip)
200{
201 if (ip->sa.sa_family == AF_INET6)
202 return nla_put(skb, attr, sizeof(struct in6_addr), &ip->sin6.sin6_addr);
203 else
204 return nla_put_be32(skb, attr, ip->sin.sin_addr.s_addr);
205}
206
207#else /* !CONFIG_IPV6 */
208
209static inline
210bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
211{
212 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
213}
214
215static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
216{
217 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
218}
219
220static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
221{
222 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
223}
224
225static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
226{
227 if (nla_len(nla) >= sizeof(struct in6_addr)) {
228 return -EAFNOSUPPORT;
229 } else if (nla_len(nla) >= sizeof(__be32)) {
230 ip->sin.sin_addr.s_addr = nla_get_be32(nla);
231 ip->sa.sa_family = AF_INET;
232 return 0;
233 } else {
234 return -EAFNOSUPPORT;
235 }
236}
237
238static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
239 const union vxlan_addr *ip)
240{
241 return nla_put_be32(skb, attr, ip->sin.sin_addr.s_addr);
242}
243#endif
244
553675fb 245/* Virtual Network hash table head */
246static inline struct hlist_head *vni_head(struct vxlan_sock *vs, u32 id)
247{
248 return &vs->vni_list[hash_32(id, VNI_HASH_BITS)];
249}
250
251/* Socket hash table head */
252static inline struct hlist_head *vs_head(struct net *net, __be16 port)
d342894c 253{
254 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
255
553675fb 256 return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
257}
258
3e61aa8f
SH		 259/* First remote destination for a forwarding entry.
260 * Guaranteed to be non-NULL because remotes are never deleted.
261 */
5ca5461c 262static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
3e61aa8f 263{
5ca5461c 264 return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
265}
266
267static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
268{
269 return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
3e61aa8f
SH		 270}
271
19ca9fc1
ML		 272/* Find VXLAN socket based on network namespace, address family and UDP port */
273static struct vxlan_sock *vxlan_find_sock(struct net *net,
274 sa_family_t family, __be16 port)
553675fb 275{
276 struct vxlan_sock *vs;
277
278 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
19ca9fc1
ML		 279 if (inet_sk(vs->sock->sk)->inet_sport == port &&
280 inet_sk(vs->sock->sk)->sk.sk_family == family)
553675fb 281 return vs;
282 }
283 return NULL;
d342894c 284}
285
5cfccc5a 286static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, u32 id)
d342894c 287{
288 struct vxlan_dev *vxlan;
d342894c 289
553675fb 290 hlist_for_each_entry_rcu(vxlan, vni_head(vs, id), hlist) {
c7995c43 291 if (vxlan->default_dst.remote_vni == id)
d342894c 292 return vxlan;
293 }
294
295 return NULL;
296}
297
5cfccc5a 298/* Look up VNI in a per net namespace table */
19ca9fc1
ML		 299static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id,
300 sa_family_t family, __be16 port)
5cfccc5a
PS		 301{
302 struct vxlan_sock *vs;
303
19ca9fc1 304 vs = vxlan_find_sock(net, family, port);
5cfccc5a
PS		 305 if (!vs)
306 return NULL;
307
308 return vxlan_vs_find_vni(vs, id);
309}
310
d342894c 311/* Fill in neighbour message in skbuff. */
312static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
234f5b73
SH		 313 const struct vxlan_fdb *fdb,
314 u32 portid, u32 seq, int type, unsigned int flags,
315 const struct vxlan_rdst *rdst)
d342894c 316{
317 unsigned long now = jiffies;
318 struct nda_cacheinfo ci;
319 struct nlmsghdr *nlh;
320 struct ndmsg *ndm;
e4f67add 321 bool send_ip, send_eth;
d342894c 322
323 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
324 if (nlh == NULL)
325 return -EMSGSIZE;
326
327 ndm = nlmsg_data(nlh);
328 memset(ndm, 0, sizeof(*ndm));
e4f67add
DS		 329
330 send_eth = send_ip = true;
331
332 if (type == RTM_GETNEIGH) {
333 ndm->ndm_family = AF_INET;
e4c7ed41 334 send_ip = !vxlan_addr_any(&rdst->remote_ip);
e4f67add
DS		 335 send_eth = !is_zero_ether_addr(fdb->eth_addr);
336 } else
337 ndm->ndm_family = AF_BRIDGE;
d342894c 338 ndm->ndm_state = fdb->state;
339 ndm->ndm_ifindex = vxlan->dev->ifindex;
ae884082 340 ndm->ndm_flags = fdb->flags;
545469f7 341 ndm->ndm_type = RTN_UNICAST;
d342894c 342
e4f67add 343 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
d342894c 344 goto nla_put_failure;
345
e4c7ed41 346 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
6681712d
DS		 347 goto nla_put_failure;
348
823aa873 349 if (rdst->remote_port && rdst->remote_port != vxlan->dst_port &&
6681712d
DS		 350 nla_put_be16(skb, NDA_PORT, rdst->remote_port))
351 goto nla_put_failure;
c7995c43 352 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
60d9d4c6 353 nla_put_u32(skb, NDA_VNI, rdst->remote_vni))
6681712d
DS		 354 goto nla_put_failure;
355 if (rdst->remote_ifindex &&
356 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
d342894c 357 goto nla_put_failure;
358
359 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
360 ci.ndm_confirmed = 0;
361 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
362 ci.ndm_refcnt = 0;
363
364 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
365 goto nla_put_failure;
366
367 return nlmsg_end(skb, nlh);
368
369nla_put_failure:
370 nlmsg_cancel(skb, nlh);
371 return -EMSGSIZE;
372}
373
374static inline size_t vxlan_nlmsg_size(void)
375{
376 return NLMSG_ALIGN(sizeof(struct ndmsg))
377 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
e4c7ed41 378 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
73cf3317 379 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
6681712d
DS		 380 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
381 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
d342894c 382 + nla_total_size(sizeof(struct nda_cacheinfo));
383}
384
9e4b93f9
ND		 385static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
386 struct vxlan_rdst *rd, int type)
d342894c 387{
388 struct net *net = dev_net(vxlan->dev);
389 struct sk_buff *skb;
390 int err = -ENOBUFS;
391
392 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
393 if (skb == NULL)
394 goto errout;
395
9e4b93f9 396 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
d342894c 397 if (err < 0) {
398 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
399 WARN_ON(err == -EMSGSIZE);
400 kfree_skb(skb);
401 goto errout;
402 }
403
404 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
405 return;
406errout:
407 if (err < 0)
408 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
409}
410
e4c7ed41 411static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
e4f67add
DS		 412{
413 struct vxlan_dev *vxlan = netdev_priv(dev);
bb3fd687
SH		 414 struct vxlan_fdb f = {
415 .state = NUD_STALE,
416 };
417 struct vxlan_rdst remote = {
e4c7ed41 418 .remote_ip = *ipa, /* goes to NDA_DST */
bb3fd687
SH		 419 .remote_vni = VXLAN_N_VID,
420 };
3e61aa8f 421
9e4b93f9 422 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
e4f67add
DS		 423}
424
425static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
426{
bb3fd687
SH		 427 struct vxlan_fdb f = {
428 .state = NUD_STALE,
429 };
9e4b93f9 430 struct vxlan_rdst remote = { };
e4f67add 431
e4f67add
DS		 432 memcpy(f.eth_addr, eth_addr, ETH_ALEN);
433
9e4b93f9 434 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
e4f67add
DS		 435}
436
d342894c 437/* Hash Ethernet address */
438static u32 eth_hash(const unsigned char *addr)
439{
440 u64 value = get_unaligned((u64 *)addr);
441
442 /* only want 6 bytes */
443#ifdef __BIG_ENDIAN
d342894c 444 value >>= 16;
321fb991 445#else
446 value <<= 16;
d342894c 447#endif
448 return hash_64(value, FDB_HASH_BITS);
449}
450
451/* Hash chain to use given mac address */
452static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
453 const u8 *mac)
454{
455 return &vxlan->fdb_head[eth_hash(mac)];
456}
457
458/* Look up Ethernet address in forwarding table */
014be2c8 459static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
d342894c 460 const u8 *mac)
d342894c 461{
462 struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
463 struct vxlan_fdb *f;
d342894c 464
b67bfe0d 465 hlist_for_each_entry_rcu(f, head, hlist) {
7367d0b5 466 if (ether_addr_equal(mac, f->eth_addr))
d342894c 467 return f;
468 }
469
470 return NULL;
471}
472
014be2c8
SS		 473static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
474 const u8 *mac)
475{
476 struct vxlan_fdb *f;
477
478 f = __vxlan_find_mac(vxlan, mac);
479 if (f)
480 f->used = jiffies;
481
482 return f;
483}
484
a5e7c10a
MR		 485/* caller should hold vxlan->hash_lock */
486static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
e4c7ed41 487 union vxlan_addr *ip, __be16 port,
a5e7c10a 488 __u32 vni, __u32 ifindex)
6681712d 489{
3e61aa8f 490 struct vxlan_rdst *rd;
6681712d 491
3e61aa8f 492 list_for_each_entry(rd, &f->remotes, list) {
e4c7ed41 493 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
6681712d
DS		 494 rd->remote_port == port &&
495 rd->remote_vni == vni &&
496 rd->remote_ifindex == ifindex)
a5e7c10a 497 return rd;
6681712d 498 }
3e61aa8f 499
a5e7c10a
MR		 500 return NULL;
501}
502
906dc186
TR		 503/* Replace destination of unicast mac */
504static int vxlan_fdb_replace(struct vxlan_fdb *f,
e4c7ed41 505 union vxlan_addr *ip, __be16 port, __u32 vni, __u32 ifindex)
906dc186
TR		 506{
507 struct vxlan_rdst *rd;
508
509 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
510 if (rd)
511 return 0;
512
513 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
514 if (!rd)
515 return 0;
e4c7ed41 516 rd->remote_ip = *ip;
906dc186
TR		 517 rd->remote_port = port;
518 rd->remote_vni = vni;
519 rd->remote_ifindex = ifindex;
520 return 1;
521}
522
a5e7c10a
MR		 523/* Add/update destinations for multicast */
524static int vxlan_fdb_append(struct vxlan_fdb *f,
9e4b93f9
ND		 525 union vxlan_addr *ip, __be16 port, __u32 vni,
526 __u32 ifindex, struct vxlan_rdst **rdp)
a5e7c10a
MR		 527{
528 struct vxlan_rdst *rd;
529
530 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
531 if (rd)
532 return 0;
533
6681712d
DS		 534 rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
535 if (rd == NULL)
536 return -ENOBUFS;
e4c7ed41 537 rd->remote_ip = *ip;
6681712d
DS		 538 rd->remote_port = port;
539 rd->remote_vni = vni;
540 rd->remote_ifindex = ifindex;
3e61aa8f
SH		 541
542 list_add_tail_rcu(&rd->list, &f->remotes);
543
9e4b93f9 544 *rdp = rd;
6681712d
DS		 545 return 1;
546}
547
dc01e7d3
OG		 548static struct sk_buff **vxlan_gro_receive(struct sk_buff **head, struct sk_buff *skb)
549{
550 struct sk_buff *p, **pp = NULL;
551 struct vxlanhdr *vh, *vh2;
552 struct ethhdr *eh, *eh2;
553 unsigned int hlen, off_vx, off_eth;
554 const struct packet_offload *ptype;
555 __be16 type;
556 int flush = 1;
557
558 off_vx = skb_gro_offset(skb);
559 hlen = off_vx + sizeof(*vh);
560 vh = skb_gro_header_fast(skb, off_vx);
561 if (skb_gro_header_hard(skb, hlen)) {
562 vh = skb_gro_header_slow(skb, hlen, off_vx);
563 if (unlikely(!vh))
564 goto out;
565 }
566 skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
6bae1d4c 567 skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
dc01e7d3
OG		 568
569 off_eth = skb_gro_offset(skb);
570 hlen = off_eth + sizeof(*eh);
571 eh = skb_gro_header_fast(skb, off_eth);
572 if (skb_gro_header_hard(skb, hlen)) {
573 eh = skb_gro_header_slow(skb, hlen, off_eth);
574 if (unlikely(!eh))
575 goto out;
576 }
577
578 flush = 0;
579
580 for (p = *head; p; p = p->next) {
581 if (!NAPI_GRO_CB(p)->same_flow)
582 continue;
583
584 vh2 = (struct vxlanhdr *)(p->data + off_vx);
585 eh2 = (struct ethhdr *)(p->data + off_eth);
586 if (vh->vx_vni != vh2->vx_vni || compare_ether_header(eh, eh2)) {
587 NAPI_GRO_CB(p)->same_flow = 0;
588 continue;
589 }
dc01e7d3
OG		 590 }
591
dc01e7d3
OG		 592 type = eh->h_proto;
593
594 rcu_read_lock();
595 ptype = gro_find_receive_by_type(type);
596 if (ptype == NULL) {
597 flush = 1;
598 goto out_unlock;
599 }
600
601 skb_gro_pull(skb, sizeof(*eh)); /* pull inner eth header */
6bae1d4c 602 skb_gro_postpull_rcsum(skb, eh, sizeof(*eh));
dc01e7d3
OG		 603 pp = ptype->callbacks.gro_receive(head, skb);
604
605out_unlock:
606 rcu_read_unlock();
607out:
608 NAPI_GRO_CB(skb)->flush |= flush;
609
610 return pp;
611}
612
613static int vxlan_gro_complete(struct sk_buff *skb, int nhoff)
614{
615 struct ethhdr *eh;
616 struct packet_offload *ptype;
617 __be16 type;
618 int vxlan_len = sizeof(struct vxlanhdr) + sizeof(struct ethhdr);
619 int err = -ENOSYS;
620
cfdf1e1b
JG		 621 udp_tunnel_gro_complete(skb, nhoff);
622
dc01e7d3
OG		 623 eh = (struct ethhdr *)(skb->data + nhoff + sizeof(struct vxlanhdr));
624 type = eh->h_proto;
625
626 rcu_read_lock();
627 ptype = gro_find_complete_by_type(type);
628 if (ptype != NULL)
629 err = ptype->callbacks.gro_complete(skb, nhoff + vxlan_len);
630
631 rcu_read_unlock();
632 return err;
633}
634
53cf5275 635/* Notify netdevs that UDP port started listening */
dc01e7d3 636static void vxlan_notify_add_rx_port(struct vxlan_sock *vs)
53cf5275
JG		 637{
638 struct net_device *dev;
dc01e7d3 639 struct sock *sk = vs->sock->sk;
53cf5275
JG		 640 struct net *net = sock_net(sk);
641 sa_family_t sa_family = sk->sk_family;
35e42379 642 __be16 port = inet_sk(sk)->inet_sport;
dc01e7d3
OG		 643 int err;
644
645 if (sa_family == AF_INET) {
646 err = udp_add_offload(&vs->udp_offloads);
647 if (err)
648 pr_warn("vxlan: udp_add_offload failed with status %d\n", err);
649 }
53cf5275
JG		 650
651 rcu_read_lock();
652 for_each_netdev_rcu(net, dev) {
653 if (dev->netdev_ops->ndo_add_vxlan_port)
654 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
655 port);
656 }
657 rcu_read_unlock();
658}
659
660/* Notify netdevs that UDP port is no more listening */
dc01e7d3 661static void vxlan_notify_del_rx_port(struct vxlan_sock *vs)
53cf5275
JG		 662{
663 struct net_device *dev;
dc01e7d3 664 struct sock *sk = vs->sock->sk;
53cf5275
JG		 665 struct net *net = sock_net(sk);
666 sa_family_t sa_family = sk->sk_family;
35e42379 667 __be16 port = inet_sk(sk)->inet_sport;
53cf5275
JG		 668
669 rcu_read_lock();
670 for_each_netdev_rcu(net, dev) {
671 if (dev->netdev_ops->ndo_del_vxlan_port)
672 dev->netdev_ops->ndo_del_vxlan_port(dev, sa_family,
673 port);
674 }
675 rcu_read_unlock();
dc01e7d3
OG		 676
677 if (sa_family == AF_INET)
678 udp_del_offload(&vs->udp_offloads);
53cf5275
JG		 679}
680
d342894c 681/* Add new entry to forwarding table -- assumes lock held */
682static int vxlan_fdb_create(struct vxlan_dev *vxlan,
e4c7ed41 683 const u8 *mac, union vxlan_addr *ip,
6681712d 684 __u16 state, __u16 flags,
73cf3317 685 __be16 port, __u32 vni, __u32 ifindex,
ae884082 686 __u8 ndm_flags)
d342894c 687{
9e4b93f9 688 struct vxlan_rdst *rd = NULL;
d342894c 689 struct vxlan_fdb *f;
690 int notify = 0;
691
014be2c8 692 f = __vxlan_find_mac(vxlan, mac);
d342894c 693 if (f) {
694 if (flags & NLM_F_EXCL) {
695 netdev_dbg(vxlan->dev,
696 "lost race to create %pM\n", mac);
697 return -EEXIST;
698 }
699 if (f->state != state) {
700 f->state = state;
701 f->updated = jiffies;
702 notify = 1;
703 }
ae884082
DS		 704 if (f->flags != ndm_flags) {
705 f->flags = ndm_flags;
706 f->updated = jiffies;
707 notify = 1;
708 }
906dc186
TR		 709 if ((flags & NLM_F_REPLACE)) {
710 /* Only change unicasts */
711 if (!(is_multicast_ether_addr(f->eth_addr) ||
712 is_zero_ether_addr(f->eth_addr))) {
713 int rc = vxlan_fdb_replace(f, ip, port, vni,
714 ifindex);
715
716 if (rc < 0)
717 return rc;
718 notify |= rc;
719 } else
720 return -EOPNOTSUPP;
721 }
6681712d 722 if ((flags & NLM_F_APPEND) &&
58e4c767
MR		 723 (is_multicast_ether_addr(f->eth_addr) ||
724 is_zero_ether_addr(f->eth_addr))) {
9e4b93f9
ND		 725 int rc = vxlan_fdb_append(f, ip, port, vni, ifindex,
726 &rd);
6681712d
DS		 727
728 if (rc < 0)
729 return rc;
730 notify |= rc;
731 }
d342894c 732 } else {
733 if (!(flags & NLM_F_CREATE))
734 return -ENOENT;
735
736 if (vxlan->addrmax && vxlan->addrcnt >= vxlan->addrmax)
737 return -ENOSPC;
738
906dc186
TR		 739 /* Disallow replace to add a multicast entry */
740 if ((flags & NLM_F_REPLACE) &&
741 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
742 return -EOPNOTSUPP;
743
e4c7ed41 744 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
d342894c 745 f = kmalloc(sizeof(*f), GFP_ATOMIC);
746 if (!f)
747 return -ENOMEM;
748
749 notify = 1;
d342894c 750 f->state = state;
ae884082 751 f->flags = ndm_flags;
d342894c 752 f->updated = f->used = jiffies;
3e61aa8f 753 INIT_LIST_HEAD(&f->remotes);
d342894c 754 memcpy(f->eth_addr, mac, ETH_ALEN);
755
9e4b93f9 756 vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
3e61aa8f 757
d342894c 758 ++vxlan->addrcnt;
759 hlist_add_head_rcu(&f->hlist,
760 vxlan_fdb_head(vxlan, mac));
761 }
762
9e4b93f9
ND		 763 if (notify) {
764 if (rd == NULL)
765 rd = first_remote_rtnl(f);
766 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
767 }
d342894c 768
769 return 0;
770}
771
6706c82e 772static void vxlan_fdb_free(struct rcu_head *head)
6681712d
DS		 773{
774 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
3e61aa8f 775 struct vxlan_rdst *rd, *nd;
6681712d 776
3e61aa8f 777 list_for_each_entry_safe(rd, nd, &f->remotes, list)
6681712d 778 kfree(rd);
6681712d
DS		 779 kfree(f);
780}
781
d342894c 782static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
783{
784 netdev_dbg(vxlan->dev,
785 "delete %pM\n", f->eth_addr);
786
787 --vxlan->addrcnt;
9e4b93f9 788 vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
d342894c 789
790 hlist_del_rcu(&f->hlist);
6681712d 791 call_rcu(&f->rcu, vxlan_fdb_free);
d342894c 792}
793
f0b074be 794static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
e4c7ed41 795 union vxlan_addr *ip, __be16 *port, u32 *vni, u32 *ifindex)
d342894c 796{
6681712d 797 struct net *net = dev_net(vxlan->dev);
e4c7ed41 798 int err;
d342894c 799
f0b074be 800 if (tb[NDA_DST]) {
e4c7ed41
CW		 801 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
802 if (err)
803 return err;
f0b074be 804 } else {
e4c7ed41
CW		 805 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
806 if (remote->sa.sa_family == AF_INET) {
807 ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
808 ip->sa.sa_family = AF_INET;
809#if IS_ENABLED(CONFIG_IPV6)
810 } else {
811 ip->sin6.sin6_addr = in6addr_any;
812 ip->sa.sa_family = AF_INET6;
813#endif
814 }
f0b074be 815 }
d342894c 816
6681712d 817 if (tb[NDA_PORT]) {
73cf3317 818 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
6681712d 819 return -EINVAL;
f0b074be
MR		 820 *port = nla_get_be16(tb[NDA_PORT]);
821 } else {
822 *port = vxlan->dst_port;
823 }
6681712d
DS		 824
825 if (tb[NDA_VNI]) {
826 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
827 return -EINVAL;
f0b074be
MR		 828 *vni = nla_get_u32(tb[NDA_VNI]);
829 } else {
830 *vni = vxlan->default_dst.remote_vni;
831 }
6681712d
DS		 832
833 if (tb[NDA_IFINDEX]) {
5abb0029 834 struct net_device *tdev;
6681712d
DS		 835
836 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
837 return -EINVAL;
f0b074be 838 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
73763949 839 tdev = __dev_get_by_index(net, *ifindex);
5abb0029 840 if (!tdev)
6681712d 841 return -EADDRNOTAVAIL;
f0b074be
MR		 842 } else {
843 *ifindex = 0;
844 }
845
846 return 0;
847}
848
849/* Add static entry (via netlink) */
850static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
851 struct net_device *dev,
852 const unsigned char *addr, u16 flags)
853{
854 struct vxlan_dev *vxlan = netdev_priv(dev);
855 /* struct net *net = dev_net(vxlan->dev); */
e4c7ed41 856 union vxlan_addr ip;
f0b074be
MR		 857 __be16 port;
858 u32 vni, ifindex;
859 int err;
860
861 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
862 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
863 ndm->ndm_state);
864 return -EINVAL;
865 }
866
867 if (tb[NDA_DST] == NULL)
868 return -EINVAL;
869
870 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
871 if (err)
872 return err;
6681712d 873
5933a7bb
MR		 874 if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
875 return -EAFNOSUPPORT;
876
d342894c 877 spin_lock_bh(&vxlan->hash_lock);
e4c7ed41 878 err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
73cf3317 879 port, vni, ifindex, ndm->ndm_flags);
d342894c 880 spin_unlock_bh(&vxlan->hash_lock);
881
882 return err;
883}
884
885/* Delete entry (via netlink) */
1690be63
VY		 886static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
887 struct net_device *dev,
d342894c 888 const unsigned char *addr)
889{
890 struct vxlan_dev *vxlan = netdev_priv(dev);
891 struct vxlan_fdb *f;
bc7892ba 892 struct vxlan_rdst *rd = NULL;
e4c7ed41 893 union vxlan_addr ip;
bc7892ba
MR		 894 __be16 port;
895 u32 vni, ifindex;
896 int err;
897
898 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
899 if (err)
900 return err;
901
902 err = -ENOENT;
d342894c 903
904 spin_lock_bh(&vxlan->hash_lock);
905 f = vxlan_find_mac(vxlan, addr);
bc7892ba
MR		 906 if (!f)
907 goto out;
908
e4c7ed41
CW		 909 if (!vxlan_addr_any(&ip)) {
910 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
bc7892ba
MR		 911 if (!rd)
912 goto out;
913 }
914
915 err = 0;
916
917 /* remove a destination if it's not the only one on the list,
918 * otherwise destroy the fdb entry
919 */
920 if (rd && !list_is_singular(&f->remotes)) {
921 list_del_rcu(&rd->list);
9e4b93f9 922 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
dcdc7a59 923 kfree_rcu(rd, rcu);
bc7892ba 924 goto out;
d342894c 925 }
bc7892ba
MR		 926
927 vxlan_fdb_destroy(vxlan, f);
928
929out:
d342894c 930 spin_unlock_bh(&vxlan->hash_lock);
931
932 return err;
933}
934
935/* Dump forwarding table */
936static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
5d5eacb3
JHS		 937 struct net_device *dev,
938 struct net_device *filter_dev, int idx)
d342894c 939{
940 struct vxlan_dev *vxlan = netdev_priv(dev);
941 unsigned int h;
942
943 for (h = 0; h < FDB_HASH_SIZE; ++h) {
944 struct vxlan_fdb *f;
d342894c 945 int err;
946
b67bfe0d 947 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
6681712d 948 struct vxlan_rdst *rd;
6681712d 949
3e61aa8f
SH		 950 if (idx < cb->args[0])
951 goto skip;
952
953 list_for_each_entry_rcu(rd, &f->remotes, list) {
6681712d
DS		 954 err = vxlan_fdb_info(skb, vxlan, f,
955 NETLINK_CB(cb->skb).portid,
956 cb->nlh->nlmsg_seq,
957 RTM_NEWNEIGH,
958 NLM_F_MULTI, rd);
959 if (err < 0)
3e61aa8f 960 goto out;
6681712d 961 }
3e61aa8f
SH		 962skip:
963 ++idx;
d342894c 964 }
965 }
3e61aa8f 966out:
d342894c 967 return idx;
968}
969
970/* Watch incoming packets to learn mapping between Ethernet address
971 * and Tunnel endpoint.
26a41ae6 972 * Return true if packet is bogus and should be droppped.
d342894c 973 */
26a41ae6 974static bool vxlan_snoop(struct net_device *dev,
e4c7ed41 975 union vxlan_addr *src_ip, const u8 *src_mac)
d342894c 976{
977 struct vxlan_dev *vxlan = netdev_priv(dev);
978 struct vxlan_fdb *f;
d342894c 979
980 f = vxlan_find_mac(vxlan, src_mac);
981 if (likely(f)) {
5ca5461c 982 struct vxlan_rdst *rdst = first_remote_rcu(f);
3e61aa8f 983
e4c7ed41 984 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
26a41ae6 985 return false;
986
987 /* Don't migrate static entries, drop packets */
eb064c3b 988 if (f->state & NUD_NOARP)
26a41ae6 989 return true;
d342894c 990
991 if (net_ratelimit())
992 netdev_info(dev,
e4c7ed41 993 "%pM migrated from %pIS to %pIS\n",
3e61aa8f 994 src_mac, &rdst->remote_ip, &src_ip);
d342894c 995
e4c7ed41 996 rdst->remote_ip = *src_ip;
d342894c 997 f->updated = jiffies;
9e4b93f9 998 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
d342894c 999 } else {
1000 /* learned new entry */
1001 spin_lock(&vxlan->hash_lock);
3bf74b1a 1002
1003 /* close off race between vxlan_flush and incoming packets */
1004 if (netif_running(dev))
1005 vxlan_fdb_create(vxlan, src_mac, src_ip,
1006 NUD_REACHABLE,
1007 NLM_F_EXCL|NLM_F_CREATE,
1008 vxlan->dst_port,
1009 vxlan->default_dst.remote_vni,
1010 0, NTF_SELF);
d342894c 1011 spin_unlock(&vxlan->hash_lock);
1012 }
26a41ae6 1013
1014 return false;
d342894c 1015}
1016
d342894c 1017/* See if multicast group is already in use by other ID */
95ab0991 1018static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
d342894c 1019{
553675fb 1020 struct vxlan_dev *vxlan;
d342894c 1021
95ab0991
G		 1022 /* The vxlan_sock is only used by dev, leaving group has
1023 * no effect on other vxlan devices.
1024 */
1025 if (atomic_read(&dev->vn_sock->refcnt) == 1)
1026 return false;
1027
553675fb 1028 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
95ab0991 1029 if (!netif_running(vxlan->dev) || vxlan == dev)
553675fb 1030 continue;
d342894c 1031
95ab0991
G		 1032 if (vxlan->vn_sock != dev->vn_sock)
1033 continue;
1034
1035 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1036 &dev->default_dst.remote_ip))
1037 continue;
1038
1039 if (vxlan->default_dst.remote_ifindex !=
1040 dev->default_dst.remote_ifindex)
1041 continue;
1042
1043 return true;
553675fb 1044 }
d342894c 1045
1046 return false;
1047}
1048
7c47cedf 1049static void vxlan_sock_hold(struct vxlan_sock *vs)
d342894c 1050{
7c47cedf
SH		 1051 atomic_inc(&vs->refcnt);
1052}
d342894c 1053
012a5729 1054void vxlan_sock_release(struct vxlan_sock *vs)
7c47cedf 1055{
53cf5275
JG		 1056 struct sock *sk = vs->sock->sk;
1057 struct net *net = sock_net(sk);
1058 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
012a5729 1059
7c47cedf
SH		 1060 if (!atomic_dec_and_test(&vs->refcnt))
1061 return;
d342894c 1062
1c51a915 1063 spin_lock(&vn->sock_lock);
7c47cedf 1064 hlist_del_rcu(&vs->hlist);
dc01e7d3 1065 vxlan_notify_del_rx_port(vs);
1c51a915
SH		 1066 spin_unlock(&vn->sock_lock);
1067
7c47cedf 1068 queue_work(vxlan_wq, &vs->del_work);
d342894c 1069}
012a5729 1070EXPORT_SYMBOL_GPL(vxlan_sock_release);
d342894c 1071
3fc2de2f 1072/* Callback to update multicast group membership when first VNI on
1073 * multicast asddress is brought up
1074 * Done as workqueue because ip_mc_join_group acquires RTNL.
7c47cedf 1075 */
3fc2de2f 1076static void vxlan_igmp_join(struct work_struct *work)
d342894c 1077{
3fc2de2f 1078 struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_join);
7c47cedf
SH		 1079 struct vxlan_sock *vs = vxlan->vn_sock;
1080 struct sock *sk = vs->sock->sk;
e4c7ed41
CW		 1081 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1082 int ifindex = vxlan->default_dst.remote_ifindex;
d342894c 1083
d342894c 1084 lock_sock(sk);
e4c7ed41
CW		 1085 if (ip->sa.sa_family == AF_INET) {
1086 struct ip_mreqn mreq = {
1087 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1088 .imr_ifindex = ifindex,
1089 };
1090
1091 ip_mc_join_group(sk, &mreq);
1092#if IS_ENABLED(CONFIG_IPV6)
1093 } else {
1094 ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1095 &ip->sin6.sin6_addr);
1096#endif
1097 }
3fc2de2f 1098 release_sock(sk);
1099
012a5729 1100 vxlan_sock_release(vs);
3fc2de2f 1101 dev_put(vxlan->dev);
1102}
1103
1104/* Inverse of vxlan_igmp_join when last VNI is brought down */
1105static void vxlan_igmp_leave(struct work_struct *work)
1106{
1107 struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_leave);
3fc2de2f 1108 struct vxlan_sock *vs = vxlan->vn_sock;
1109 struct sock *sk = vs->sock->sk;
e4c7ed41
CW		 1110 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1111 int ifindex = vxlan->default_dst.remote_ifindex;
3fc2de2f 1112
1113 lock_sock(sk);
e4c7ed41
CW		 1114 if (ip->sa.sa_family == AF_INET) {
1115 struct ip_mreqn mreq = {
1116 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1117 .imr_ifindex = ifindex,
1118 };
1119
1120 ip_mc_leave_group(sk, &mreq);
1121#if IS_ENABLED(CONFIG_IPV6)
1122 } else {
1123 ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1124 &ip->sin6.sin6_addr);
1125#endif
1126 }
1127
d342894c 1128 release_sock(sk);
d342894c 1129
012a5729 1130 vxlan_sock_release(vs);
7c47cedf 1131 dev_put(vxlan->dev);
d342894c 1132}
1133
1134/* Callback from net/ipv4/udp.c to receive packets */
1135static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
1136{
5cfccc5a 1137 struct vxlan_sock *vs;
d342894c 1138 struct vxlanhdr *vxh;
d342894c 1139
d342894c 1140 /* Need Vxlan and inner Ethernet header to be present */
7ce04758 1141 if (!pskb_may_pull(skb, VXLAN_HLEN))
d342894c 1142 goto error;
1143
7ce04758
PS		 1144 /* Return packets with reserved bits set */
1145 vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
d342894c 1146 if (vxh->vx_flags != htonl(VXLAN_FLAGS) ||
1147 (vxh->vx_vni & htonl(0xff))) {
1148 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1149 ntohl(vxh->vx_flags), ntohl(vxh->vx_vni));
1150 goto error;
1151 }
1152
5cfccc5a
PS		 1153 if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB)))
1154 goto drop;
1155
559835ea 1156 vs = rcu_dereference_sk_user_data(sk);
5cfccc5a 1157 if (!vs)
d342894c 1158 goto drop;
d342894c 1159
5cfccc5a
PS		 1160 vs->rcv(vs, skb, vxh->vx_vni);
1161 return 0;
1162
1163drop:
1164 /* Consume bad packet */
1165 kfree_skb(skb);
1166 return 0;
1167
1168error:
1169 /* Return non vxlan pkt */
1170 return 1;
1171}
1172
1173static void vxlan_rcv(struct vxlan_sock *vs,
1174 struct sk_buff *skb, __be32 vx_vni)
1175{
e4c7ed41
CW		 1176 struct iphdr *oip = NULL;
1177 struct ipv6hdr *oip6 = NULL;
5cfccc5a 1178 struct vxlan_dev *vxlan;
8f84985f 1179 struct pcpu_sw_netstats *stats;
e4c7ed41 1180 union vxlan_addr saddr;
5cfccc5a 1181 __u32 vni;
e4c7ed41
CW		 1182 int err = 0;
1183 union vxlan_addr *remote_ip;
5cfccc5a
PS		 1184
1185 vni = ntohl(vx_vni) >> 8;
1186 /* Is this VNI defined? */
1187 vxlan = vxlan_vs_find_vni(vs, vni);
1188 if (!vxlan)
d342894c 1189 goto drop;
d342894c 1190
e4c7ed41 1191 remote_ip = &vxlan->default_dst.remote_ip;
e4f67add 1192 skb_reset_mac_header(skb);
f01ec1c0 1193 skb_scrub_packet(skb, !net_eq(vxlan->net, dev_net(vxlan->dev)));
d342894c 1194 skb->protocol = eth_type_trans(skb, vxlan->dev);
f79b064c 1195 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
d342894c 1196
1197 /* Ignore packet loops (and multicast echo) */
7367d0b5 1198 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
d342894c 1199 goto drop;
1200
7ce04758 1201 /* Re-examine inner Ethernet packet */
e4c7ed41
CW		 1202 if (remote_ip->sa.sa_family == AF_INET) {
1203 oip = ip_hdr(skb);
1204 saddr.sin.sin_addr.s_addr = oip->saddr;
1205 saddr.sa.sa_family = AF_INET;
1206#if IS_ENABLED(CONFIG_IPV6)
1207 } else {
1208 oip6 = ipv6_hdr(skb);
1209 saddr.sin6.sin6_addr = oip6->saddr;
1210 saddr.sa.sa_family = AF_INET6;
1211#endif
1212 }
1213
26a41ae6 1214 if ((vxlan->flags & VXLAN_F_LEARN) &&
e4c7ed41 1215 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
26a41ae6 1216 goto drop;
d342894c 1217
d342894c 1218 skb_reset_network_header(skb);
0afb1666 1219
e4c7ed41
CW		 1220 if (oip6)
1221 err = IP6_ECN_decapsulate(oip6, skb);
1222 if (oip)
1223 err = IP_ECN_decapsulate(oip, skb);
1224
d342894c 1225 if (unlikely(err)) {
e4c7ed41
CW		 1226 if (log_ecn_error) {
1227 if (oip6)
1228 net_info_ratelimited("non-ECT from %pI6\n",
1229 &oip6->saddr);
1230 if (oip)
1231 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1232 &oip->saddr, oip->tos);
1233 }
d342894c 1234 if (err > 1) {
1235 ++vxlan->dev->stats.rx_frame_errors;
1236 ++vxlan->dev->stats.rx_errors;
1237 goto drop;
1238 }
1239 }
1240
e8171045 1241 stats = this_cpu_ptr(vxlan->dev->tstats);
d342894c 1242 u64_stats_update_begin(&stats->syncp);
1243 stats->rx_packets++;
1244 stats->rx_bytes += skb->len;
1245 u64_stats_update_end(&stats->syncp);
1246
1247 netif_rx(skb);
1248
5cfccc5a 1249 return;
d342894c 1250drop:
1251 /* Consume bad packet */
1252 kfree_skb(skb);
d342894c 1253}
1254
e4f67add
DS		 1255static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1256{
1257 struct vxlan_dev *vxlan = netdev_priv(dev);
1258 struct arphdr *parp;
1259 u8 *arpptr, *sha;
1260 __be32 sip, tip;
1261 struct neighbour *n;
1262
1263 if (dev->flags & IFF_NOARP)
1264 goto out;
1265
1266 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1267 dev->stats.tx_dropped++;
1268 goto out;
1269 }
1270 parp = arp_hdr(skb);
1271
1272 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1273 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1274 parp->ar_pro != htons(ETH_P_IP) ||
1275 parp->ar_op != htons(ARPOP_REQUEST) ||
1276 parp->ar_hln != dev->addr_len ||
1277 parp->ar_pln != 4)
1278 goto out;
1279 arpptr = (u8 *)parp + sizeof(struct arphdr);
1280 sha = arpptr;
1281 arpptr += dev->addr_len; /* sha */
1282 memcpy(&sip, arpptr, sizeof(sip));
1283 arpptr += sizeof(sip);
1284 arpptr += dev->addr_len; /* tha */
1285 memcpy(&tip, arpptr, sizeof(tip));
1286
1287 if (ipv4_is_loopback(tip) ||
1288 ipv4_is_multicast(tip))
1289 goto out;
1290
1291 n = neigh_lookup(&arp_tbl, &tip, dev);
1292
1293 if (n) {
e4f67add
DS		 1294 struct vxlan_fdb *f;
1295 struct sk_buff *reply;
1296
1297 if (!(n->nud_state & NUD_CONNECTED)) {
1298 neigh_release(n);
1299 goto out;
1300 }
1301
1302 f = vxlan_find_mac(vxlan, n->ha);
e4c7ed41 1303 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
e4f67add
DS		 1304 /* bridge-local neighbor */
1305 neigh_release(n);
1306 goto out;
1307 }
1308
1309 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1310 n->ha, sha);
1311
1312 neigh_release(n);
1313
7346135d
DS		 1314 if (reply == NULL)
1315 goto out;
1316
e4f67add
DS		 1317 skb_reset_mac_header(reply);
1318 __skb_pull(reply, skb_network_offset(reply));
1319 reply->ip_summed = CHECKSUM_UNNECESSARY;
1320 reply->pkt_type = PACKET_HOST;
1321
1322 if (netif_rx_ni(reply) == NET_RX_DROP)
1323 dev->stats.rx_dropped++;
e4c7ed41
CW		 1324 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1325 union vxlan_addr ipa = {
1326 .sin.sin_addr.s_addr = tip,
a45e92a5 1327 .sin.sin_family = AF_INET,
e4c7ed41
CW		 1328 };
1329
1330 vxlan_ip_miss(dev, &ipa);
1331 }
e4f67add
DS		 1332out:
1333 consume_skb(skb);
1334 return NETDEV_TX_OK;
1335}
1336
f564f45c 1337#if IS_ENABLED(CONFIG_IPV6)
4b29dba9
DS		 1338static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1339 struct neighbour *n, bool isrouter)
1340{
1341 struct net_device *dev = request->dev;
1342 struct sk_buff *reply;
1343 struct nd_msg *ns, *na;
1344 struct ipv6hdr *pip6;
1345 u8 *daddr;
1346 int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1347 int ns_olen;
1348 int i, len;
1349
1350 if (dev == NULL)
1351 return NULL;
1352
1353 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1354 sizeof(*na) + na_olen + dev->needed_tailroom;
1355 reply = alloc_skb(len, GFP_ATOMIC);
1356 if (reply == NULL)
1357 return NULL;
1358
1359 reply->protocol = htons(ETH_P_IPV6);
1360 reply->dev = dev;
1361 skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1362 skb_push(reply, sizeof(struct ethhdr));
1363 skb_set_mac_header(reply, 0);
1364
1365 ns = (struct nd_msg *)skb_transport_header(request);
1366
1367 daddr = eth_hdr(request)->h_source;
1368 ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
1369 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1370 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1371 daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1372 break;
1373 }
1374 }
1375
1376 /* Ethernet header */
1377 ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1378 ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1379 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1380 reply->protocol = htons(ETH_P_IPV6);
1381
1382 skb_pull(reply, sizeof(struct ethhdr));
1383 skb_set_network_header(reply, 0);
1384 skb_put(reply, sizeof(struct ipv6hdr));
1385
1386 /* IPv6 header */
1387
1388 pip6 = ipv6_hdr(reply);
1389 memset(pip6, 0, sizeof(struct ipv6hdr));
1390 pip6->version = 6;
1391 pip6->priority = ipv6_hdr(request)->priority;
1392 pip6->nexthdr = IPPROTO_ICMPV6;
1393 pip6->hop_limit = 255;
1394 pip6->daddr = ipv6_hdr(request)->saddr;
1395 pip6->saddr = *(struct in6_addr *)n->primary_key;
1396
1397 skb_pull(reply, sizeof(struct ipv6hdr));
1398 skb_set_transport_header(reply, 0);
1399
1400 na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1401
1402 /* Neighbor Advertisement */
1403 memset(na, 0, sizeof(*na)+na_olen);
1404 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1405 na->icmph.icmp6_router = isrouter;
1406 na->icmph.icmp6_override = 1;
1407 na->icmph.icmp6_solicited = 1;
1408 na->target = ns->target;
1409 ether_addr_copy(&na->opt[2], n->ha);
1410 na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1411 na->opt[1] = na_olen >> 3;
1412
1413 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1414 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1415 csum_partial(na, sizeof(*na)+na_olen, 0));
1416
1417 pip6->payload_len = htons(sizeof(*na)+na_olen);
1418
1419 skb_push(reply, sizeof(struct ipv6hdr));
1420
1421 reply->ip_summed = CHECKSUM_UNNECESSARY;
1422
1423 return reply;
1424}
1425
f564f45c
CW		 1426static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1427{
1428 struct vxlan_dev *vxlan = netdev_priv(dev);
4b29dba9 1429 struct nd_msg *msg;
f564f45c
CW		 1430 const struct ipv6hdr *iphdr;
1431 const struct in6_addr *saddr, *daddr;
4b29dba9
DS		 1432 struct neighbour *n;
1433 struct inet6_dev *in6_dev;
f564f45c
CW		 1434
1435 in6_dev = __in6_dev_get(dev);
1436 if (!in6_dev)
1437 goto out;
1438
f564f45c
CW		 1439 iphdr = ipv6_hdr(skb);
1440 saddr = &iphdr->saddr;
1441 daddr = &iphdr->daddr;
1442
f564f45c
CW		 1443 msg = (struct nd_msg *)skb_transport_header(skb);
1444 if (msg->icmph.icmp6_code != 0 ||
1445 msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1446 goto out;
1447
4b29dba9
DS		 1448 if (ipv6_addr_loopback(daddr) ||
1449 ipv6_addr_is_multicast(&msg->target))
1450 goto out;
1451
1452 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
f564f45c
CW		 1453
1454 if (n) {
1455 struct vxlan_fdb *f;
4b29dba9 1456 struct sk_buff *reply;
f564f45c
CW		 1457
1458 if (!(n->nud_state & NUD_CONNECTED)) {
1459 neigh_release(n);
1460 goto out;
1461 }
1462
1463 f = vxlan_find_mac(vxlan, n->ha);
1464 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1465 /* bridge-local neighbor */
1466 neigh_release(n);
1467 goto out;
1468 }
1469
4b29dba9
DS		 1470 reply = vxlan_na_create(skb, n,
1471 !!(f ? f->flags & NTF_ROUTER : 0));
1472
f564f45c 1473 neigh_release(n);
4b29dba9
DS		 1474
1475 if (reply == NULL)
1476 goto out;
1477
1478 if (netif_rx_ni(reply) == NET_RX_DROP)
1479 dev->stats.rx_dropped++;
1480
f564f45c 1481 } else if (vxlan->flags & VXLAN_F_L3MISS) {
4b29dba9
DS		 1482 union vxlan_addr ipa = {
1483 .sin6.sin6_addr = msg->target,
a45e92a5 1484 .sin6.sin6_family = AF_INET6,
4b29dba9
DS		 1485 };
1486
f564f45c
CW		 1487 vxlan_ip_miss(dev, &ipa);
1488 }
1489
1490out:
1491 consume_skb(skb);
1492 return NETDEV_TX_OK;
1493}
1494#endif
1495
e4f67add
DS		 1496static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1497{
1498 struct vxlan_dev *vxlan = netdev_priv(dev);
1499 struct neighbour *n;
e4f67add
DS		 1500
1501 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1502 return false;
1503
1504 n = NULL;
1505 switch (ntohs(eth_hdr(skb)->h_proto)) {
1506 case ETH_P_IP:
e15a00aa
CW		 1507 {
1508 struct iphdr *pip;
1509
e4f67add
DS		 1510 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1511 return false;
1512 pip = ip_hdr(skb);
1513 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
e4c7ed41
CW		 1514 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1515 union vxlan_addr ipa = {
1516 .sin.sin_addr.s_addr = pip->daddr,
a45e92a5 1517 .sin.sin_family = AF_INET,
e4c7ed41
CW		 1518 };
1519
1520 vxlan_ip_miss(dev, &ipa);
1521 return false;
1522 }
1523
e4f67add 1524 break;
e15a00aa
CW		 1525 }
1526#if IS_ENABLED(CONFIG_IPV6)
1527 case ETH_P_IPV6:
1528 {
1529 struct ipv6hdr *pip6;
1530
1531 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1532 return false;
1533 pip6 = ipv6_hdr(skb);
1534 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1535 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1536 union vxlan_addr ipa = {
1537 .sin6.sin6_addr = pip6->daddr,
a45e92a5 1538 .sin6.sin6_family = AF_INET6,
e15a00aa
CW		 1539 };
1540
1541 vxlan_ip_miss(dev, &ipa);
1542 return false;
1543 }
1544
1545 break;
1546 }
1547#endif
e4f67add
DS		 1548 default:
1549 return false;
1550 }
1551
1552 if (n) {
1553 bool diff;
1554
7367d0b5 1555 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
e4f67add
DS		 1556 if (diff) {
1557 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1558 dev->addr_len);
1559 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1560 }
1561 neigh_release(n);
1562 return diff;
e4c7ed41
CW		 1563 }
1564
e4f67add
DS		 1565 return false;
1566}
1567
e4c7ed41 1568#if IS_ENABLED(CONFIG_IPV6)
11796187 1569static int vxlan6_xmit_skb(struct vxlan_sock *vs,
e4c7ed41
CW		 1570 struct dst_entry *dst, struct sk_buff *skb,
1571 struct net_device *dev, struct in6_addr *saddr,
1572 struct in6_addr *daddr, __u8 prio, __u8 ttl,
f01ec1c0
ND		 1573 __be16 src_port, __be16 dst_port, __be32 vni,
1574 bool xnet)
e4c7ed41 1575{
e4c7ed41 1576 struct vxlanhdr *vxh;
e4c7ed41
CW		 1577 int min_headroom;
1578 int err;
acbf74a7 1579 bool udp_sum = !udp_get_no_check6_tx(vs->sock->sk);
e4c7ed41 1580
acbf74a7 1581 skb = udp_tunnel_handle_offloads(skb, udp_sum);
359a0ea9
TH		 1582 if (IS_ERR(skb))
1583 return -EINVAL;
e4c7ed41 1584
f01ec1c0 1585 skb_scrub_packet(skb, xnet);
963a88b3 1586
e4c7ed41
CW		 1587 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1588 + VXLAN_HLEN + sizeof(struct ipv6hdr)
1589 + (vlan_tx_tag_present(skb) ? VLAN_HLEN : 0);
1590
1591 /* Need space for new headers (invalidates iph ptr) */
1592 err = skb_cow_head(skb, min_headroom);
1593 if (unlikely(err))
1594 return err;
1595
1596 if (vlan_tx_tag_present(skb)) {
1597 if (WARN_ON(!__vlan_put_tag(skb,
1598 skb->vlan_proto,
1599 vlan_tx_tag_get(skb))))
1600 return -ENOMEM;
1601
1602 skb->vlan_tci = 0;
1603 }
1604
1605 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1606 vxh->vx_flags = htonl(VXLAN_FLAGS);
1607 vxh->vx_vni = vni;
1608
996c9fd1
TH		 1609 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1610
acbf74a7
AZ		 1611 udp_tunnel6_xmit_skb(vs->sock, dst, skb, dev, saddr, daddr, prio,
1612 ttl, src_port, dst_port);
e4c7ed41
CW		 1613 return 0;
1614}
1615#endif
1616
11796187 1617int vxlan_xmit_skb(struct vxlan_sock *vs,
49560532
PS		 1618 struct rtable *rt, struct sk_buff *skb,
1619 __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
f01ec1c0 1620 __be16 src_port, __be16 dst_port, __be32 vni, bool xnet)
49560532
PS		 1621{
1622 struct vxlanhdr *vxh;
649c5b8b 1623 int min_headroom;
49560532 1624 int err;
acbf74a7 1625 bool udp_sum = !vs->sock->sk->sk_no_check_tx;
49560532 1626
acbf74a7 1627 skb = udp_tunnel_handle_offloads(skb, udp_sum);
359a0ea9
TH		 1628 if (IS_ERR(skb))
1629 return -EINVAL;
49560532 1630
649c5b8b 1631 min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
1eaa8178
PS		 1632 + VXLAN_HLEN + sizeof(struct iphdr)
1633 + (vlan_tx_tag_present(skb) ? VLAN_HLEN : 0);
649c5b8b
PS		 1634
1635 /* Need space for new headers (invalidates iph ptr) */
1636 err = skb_cow_head(skb, min_headroom);
1637 if (unlikely(err))
1638 return err;
1639
1eaa8178
PS		 1640 if (vlan_tx_tag_present(skb)) {
1641 if (WARN_ON(!__vlan_put_tag(skb,
1642 skb->vlan_proto,
1643 vlan_tx_tag_get(skb))))
1644 return -ENOMEM;
1645
1646 skb->vlan_tci = 0;
1647 }
1648
49560532
PS		 1649 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1650 vxh->vx_flags = htonl(VXLAN_FLAGS);
1651 vxh->vx_vni = vni;
1652
996c9fd1
TH		 1653 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1654
acbf74a7
AZ		 1655 return udp_tunnel_xmit_skb(vs->sock, rt, skb, src, dst, tos,
1656 ttl, df, src_port, dst_port, xnet);
49560532
PS		 1657}
1658EXPORT_SYMBOL_GPL(vxlan_xmit_skb);
1659
9dcc71e1
SS		 1660/* Bypass encapsulation if the destination is local */
1661static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1662 struct vxlan_dev *dst_vxlan)
1663{
8f84985f 1664 struct pcpu_sw_netstats *tx_stats, *rx_stats;
e4c7ed41
CW		 1665 union vxlan_addr loopback;
1666 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
ce6502a8
LR		 1667 struct net_device *dev = skb->dev;
1668 int len = skb->len;
9dcc71e1 1669
8f84985f
LR		 1670 tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1671 rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
9dcc71e1
SS		 1672 skb->pkt_type = PACKET_HOST;
1673 skb->encapsulation = 0;
1674 skb->dev = dst_vxlan->dev;
1675 __skb_pull(skb, skb_network_offset(skb));
1676
e4c7ed41
CW		 1677 if (remote_ip->sa.sa_family == AF_INET) {
1678 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1679 loopback.sa.sa_family = AF_INET;
1680#if IS_ENABLED(CONFIG_IPV6)
1681 } else {
1682 loopback.sin6.sin6_addr = in6addr_loopback;
1683 loopback.sa.sa_family = AF_INET6;
1684#endif
1685 }
1686
9dcc71e1 1687 if (dst_vxlan->flags & VXLAN_F_LEARN)
e4c7ed41 1688 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
9dcc71e1
SS		 1689
1690 u64_stats_update_begin(&tx_stats->syncp);
1691 tx_stats->tx_packets++;
ce6502a8 1692 tx_stats->tx_bytes += len;
9dcc71e1
SS		 1693 u64_stats_update_end(&tx_stats->syncp);
1694
1695 if (netif_rx(skb) == NET_RX_SUCCESS) {
1696 u64_stats_update_begin(&rx_stats->syncp);
1697 rx_stats->rx_packets++;
ce6502a8 1698 rx_stats->rx_bytes += len;
9dcc71e1
SS		 1699 u64_stats_update_end(&rx_stats->syncp);
1700 } else {
ce6502a8 1701 dev->stats.rx_dropped++;
9dcc71e1
SS		 1702 }
1703}
1704
4ad16930
SH		 1705static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1706 struct vxlan_rdst *rdst, bool did_rsc)
d342894c 1707{
1708 struct vxlan_dev *vxlan = netdev_priv(dev);
e4c7ed41 1709 struct rtable *rt = NULL;
d342894c 1710 const struct iphdr *old_iph;
d342894c 1711 struct flowi4 fl4;
e4c7ed41
CW		 1712 union vxlan_addr *dst;
1713 __be16 src_port = 0, dst_port;
234f5b73 1714 u32 vni;
d342894c 1715 __be16 df = 0;
1716 __u8 tos, ttl;
0e6fbc5b 1717 int err;
d342894c 1718
823aa873 1719 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->dst_port;
6681712d 1720 vni = rdst->remote_vni;
e4c7ed41 1721 dst = &rdst->remote_ip;
e4f67add 1722
e4c7ed41 1723 if (vxlan_addr_any(dst)) {
e4f67add 1724 if (did_rsc) {
e4f67add 1725 /* short-circuited back to local bridge */
9dcc71e1 1726 vxlan_encap_bypass(skb, vxlan, vxlan);
4ad16930 1727 return;
e4f67add 1728 }
ef59febe 1729 goto drop;
e4f67add 1730 }
ef59febe 1731
d342894c 1732 old_iph = ip_hdr(skb);
1733
d342894c 1734 ttl = vxlan->ttl;
e4c7ed41 1735 if (!ttl && vxlan_addr_multicast(dst))
d342894c 1736 ttl = 1;
1737
1738 tos = vxlan->tos;
1739 if (tos == 1)
206aaafc 1740 tos = ip_tunnel_get_dsfield(old_iph, skb);
d342894c 1741
535fb8d0
TH		 1742 src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->port_min,
1743 vxlan->port_max, true);
d342894c 1744
e4c7ed41
CW		 1745 if (dst->sa.sa_family == AF_INET) {
1746 memset(&fl4, 0, sizeof(fl4));
1747 fl4.flowi4_oif = rdst->remote_ifindex;
1748 fl4.flowi4_tos = RT_TOS(tos);
1749 fl4.daddr = dst->sin.sin_addr.s_addr;
1750 fl4.saddr = vxlan->saddr.sin.sin_addr.s_addr;
1751
f01ec1c0 1752 rt = ip_route_output_key(vxlan->net, &fl4);
e4c7ed41
CW		 1753 if (IS_ERR(rt)) {
1754 netdev_dbg(dev, "no route to %pI4\n",
1755 &dst->sin.sin_addr.s_addr);
1756 dev->stats.tx_carrier_errors++;
1757 goto tx_error;
1758 }
d342894c 1759
e4c7ed41
CW		 1760 if (rt->dst.dev == dev) {
1761 netdev_dbg(dev, "circular route to %pI4\n",
1762 &dst->sin.sin_addr.s_addr);
1763 dev->stats.collisions++;
fffc15a5 1764 goto rt_tx_error;
e4c7ed41
CW		 1765 }
1766
1767 /* Bypass encapsulation if the destination is local */
1768 if (rt->rt_flags & RTCF_LOCAL &&
1769 !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1770 struct vxlan_dev *dst_vxlan;
1771
1772 ip_rt_put(rt);
19ca9fc1
ML		 1773 dst_vxlan = vxlan_find_vni(vxlan->net, vni,
1774 dst->sa.sa_family, dst_port);
e4c7ed41
CW		 1775 if (!dst_vxlan)
1776 goto tx_error;
1777 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1778 return;
1779 }
1780
1781 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
1782 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
d342894c 1783
3c4d1dae
AZ		 1784 err = vxlan_xmit_skb(vxlan->vn_sock, rt, skb,
1785 fl4.saddr, dst->sin.sin_addr.s_addr,
1786 tos, ttl, df, src_port, dst_port,
1787 htonl(vni << 8),
1788 !net_eq(vxlan->net, dev_net(vxlan->dev)));
9dcc71e1 1789
e4c7ed41
CW		 1790 if (err < 0)
1791 goto rt_tx_error;
1792 iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
1793#if IS_ENABLED(CONFIG_IPV6)
1794 } else {
1795 struct sock *sk = vxlan->vn_sock->sock->sk;
1796 struct dst_entry *ndst;
1797 struct flowi6 fl6;
1798 u32 flags;
1799
1800 memset(&fl6, 0, sizeof(fl6));
1801 fl6.flowi6_oif = rdst->remote_ifindex;
1802 fl6.daddr = dst->sin6.sin6_addr;
1803 fl6.saddr = vxlan->saddr.sin6.sin6_addr;
8c1bb79f 1804 fl6.flowi6_proto = IPPROTO_UDP;
e4c7ed41
CW		 1805
1806 if (ipv6_stub->ipv6_dst_lookup(sk, &ndst, &fl6)) {
1807 netdev_dbg(dev, "no route to %pI6\n",
1808 &dst->sin6.sin6_addr);
1809 dev->stats.tx_carrier_errors++;
9dcc71e1 1810 goto tx_error;
e4c7ed41 1811 }
d342894c 1812
e4c7ed41
CW		 1813 if (ndst->dev == dev) {
1814 netdev_dbg(dev, "circular route to %pI6\n",
1815 &dst->sin6.sin6_addr);
1816 dst_release(ndst);
1817 dev->stats.collisions++;
1818 goto tx_error;
1819 }
0e6fbc5b 1820
e4c7ed41
CW		 1821 /* Bypass encapsulation if the destination is local */
1822 flags = ((struct rt6_info *)ndst)->rt6i_flags;
1823 if (flags & RTF_LOCAL &&
1824 !(flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1825 struct vxlan_dev *dst_vxlan;
1826
1827 dst_release(ndst);
19ca9fc1
ML		 1828 dst_vxlan = vxlan_find_vni(vxlan->net, vni,
1829 dst->sa.sa_family, dst_port);
e4c7ed41
CW		 1830 if (!dst_vxlan)
1831 goto tx_error;
1832 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1833 return;
1834 }
49560532 1835
e4c7ed41
CW		 1836 ttl = ttl ? : ip6_dst_hoplimit(ndst);
1837
11796187 1838 err = vxlan6_xmit_skb(vxlan->vn_sock, ndst, skb,
e4c7ed41 1839 dev, &fl6.saddr, &fl6.daddr, 0, ttl,
f01ec1c0
ND		 1840 src_port, dst_port, htonl(vni << 8),
1841 !net_eq(vxlan->net, dev_net(vxlan->dev)));
e4c7ed41
CW		 1842#endif
1843 }
0e6fbc5b 1844
4ad16930 1845 return;
d342894c 1846
1847drop:
1848 dev->stats.tx_dropped++;
1849 goto tx_free;
1850
49560532
PS		 1851rt_tx_error:
1852 ip_rt_put(rt);
d342894c 1853tx_error:
1854 dev->stats.tx_errors++;
1855tx_free:
1856 dev_kfree_skb(skb);
d342894c 1857}
1858
6681712d
DS		 1859/* Transmit local packets over Vxlan
1860 *
1861 * Outer IP header inherits ECN and DF from inner header.
1862 * Outer UDP destination is the VXLAN assigned port.
1863 * source port is based on hash of flow
1864 */
1865static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
1866{
1867 struct vxlan_dev *vxlan = netdev_priv(dev);
1868 struct ethhdr *eth;
1869 bool did_rsc = false;
8f646c92 1870 struct vxlan_rdst *rdst, *fdst = NULL;
6681712d 1871 struct vxlan_fdb *f;
6681712d
DS		 1872
1873 skb_reset_mac_header(skb);
1874 eth = eth_hdr(skb);
1875
f564f45c
CW		 1876 if ((vxlan->flags & VXLAN_F_PROXY)) {
1877 if (ntohs(eth->h_proto) == ETH_P_ARP)
1878 return arp_reduce(dev, skb);
1879#if IS_ENABLED(CONFIG_IPV6)
1880 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
91269e39
LR		 1881 pskb_may_pull(skb, sizeof(struct ipv6hdr)
1882 + sizeof(struct nd_msg)) &&
f564f45c
CW		 1883 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
1884 struct nd_msg *msg;
1885
1886 msg = (struct nd_msg *)skb_transport_header(skb);
1887 if (msg->icmph.icmp6_code == 0 &&
1888 msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
1889 return neigh_reduce(dev, skb);
1890 }
7a9f526f 1891 eth = eth_hdr(skb);
f564f45c
CW		 1892#endif
1893 }
6681712d
DS		 1894
1895 f = vxlan_find_mac(vxlan, eth->h_dest);
ae884082
DS		 1896 did_rsc = false;
1897
1898 if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
e15a00aa
CW		 1899 (ntohs(eth->h_proto) == ETH_P_IP ||
1900 ntohs(eth->h_proto) == ETH_P_IPV6)) {
ae884082
DS		 1901 did_rsc = route_shortcircuit(dev, skb);
1902 if (did_rsc)
1903 f = vxlan_find_mac(vxlan, eth->h_dest);
1904 }
1905
6681712d 1906 if (f == NULL) {
afbd8bae
MR		 1907 f = vxlan_find_mac(vxlan, all_zeros_mac);
1908 if (f == NULL) {
1909 if ((vxlan->flags & VXLAN_F_L2MISS) &&
1910 !is_multicast_ether_addr(eth->h_dest))
1911 vxlan_fdb_miss(vxlan, eth->h_dest);
1912
1913 dev->stats.tx_dropped++;
8f646c92 1914 kfree_skb(skb);
afbd8bae
MR		 1915 return NETDEV_TX_OK;
1916 }
1917 }
6681712d 1918
afbd8bae
MR		 1919 list_for_each_entry_rcu(rdst, &f->remotes, list) {
1920 struct sk_buff *skb1;
6681712d 1921
8f646c92
ED		 1922 if (!fdst) {
1923 fdst = rdst;
1924 continue;
1925 }
afbd8bae
MR		 1926 skb1 = skb_clone(skb, GFP_ATOMIC);
1927 if (skb1)
1928 vxlan_xmit_one(skb1, dev, rdst, did_rsc);
6681712d
DS		 1929 }
1930
8f646c92
ED		 1931 if (fdst)
1932 vxlan_xmit_one(skb, dev, fdst, did_rsc);
1933 else
1934 kfree_skb(skb);
4ad16930 1935 return NETDEV_TX_OK;
6681712d
DS		 1936}
1937
d342894c 1938/* Walk the forwarding table and purge stale entries */
1939static void vxlan_cleanup(unsigned long arg)
1940{
1941 struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
1942 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
1943 unsigned int h;
1944
1945 if (!netif_running(vxlan->dev))
1946 return;
1947
1948 spin_lock_bh(&vxlan->hash_lock);
1949 for (h = 0; h < FDB_HASH_SIZE; ++h) {
1950 struct hlist_node *p, *n;
1951 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
1952 struct vxlan_fdb *f
1953 = container_of(p, struct vxlan_fdb, hlist);
1954 unsigned long timeout;
1955
3c172868 1956 if (f->state & NUD_PERMANENT)
d342894c 1957 continue;
1958
1959 timeout = f->used + vxlan->age_interval * HZ;
1960 if (time_before_eq(timeout, jiffies)) {
1961 netdev_dbg(vxlan->dev,
1962 "garbage collect %pM\n",
1963 f->eth_addr);
1964 f->state = NUD_STALE;
1965 vxlan_fdb_destroy(vxlan, f);
1966 } else if (time_before(timeout, next_timer))
1967 next_timer = timeout;
1968 }
1969 }
1970 spin_unlock_bh(&vxlan->hash_lock);
1971
1972 mod_timer(&vxlan->age_timer, next_timer);
1973}
1974
9c2e24e1
PS		 1975static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
1976{
1977 __u32 vni = vxlan->default_dst.remote_vni;
1978
1979 vxlan->vn_sock = vs;
1980 hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
1981}
1982
d342894c 1983/* Setup stats when device is created */
1984static int vxlan_init(struct net_device *dev)
1985{
1c51a915 1986 struct vxlan_dev *vxlan = netdev_priv(dev);
f01ec1c0 1987 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
1c51a915 1988 struct vxlan_sock *vs;
19ca9fc1 1989 bool ipv6 = vxlan->flags & VXLAN_F_IPV6;
1c51a915 1990
1c213bd2 1991 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
e8171045 1992 if (!dev->tstats)
d342894c 1993 return -ENOMEM;
1994
1c51a915 1995 spin_lock(&vn->sock_lock);
19ca9fc1
ML		 1996 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
1997 vxlan->dst_port);
1c51a915
SH		 1998 if (vs) {
1999 /* If we have a socket with same port already, reuse it */
2000 atomic_inc(&vs->refcnt);
9c2e24e1 2001 vxlan_vs_add_dev(vs, vxlan);
1c51a915
SH		 2002 } else {
2003 /* otherwise make new socket outside of RTNL */
2004 dev_hold(dev);
2005 queue_work(vxlan_wq, &vxlan->sock_work);
2006 }
2007 spin_unlock(&vn->sock_lock);
2008
d342894c 2009 return 0;
2010}
2011
ba609e9b 2012static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
afbd8bae
MR		 2013{
2014 struct vxlan_fdb *f;
2015
2016 spin_lock_bh(&vxlan->hash_lock);
2017 f = __vxlan_find_mac(vxlan, all_zeros_mac);
2018 if (f)
2019 vxlan_fdb_destroy(vxlan, f);
2020 spin_unlock_bh(&vxlan->hash_lock);
2021}
2022
ebf4063e
SH		 2023static void vxlan_uninit(struct net_device *dev)
2024{
2025 struct vxlan_dev *vxlan = netdev_priv(dev);
ebf4063e
SH		 2026 struct vxlan_sock *vs = vxlan->vn_sock;
2027
ba609e9b 2028 vxlan_fdb_delete_default(vxlan);
afbd8bae 2029
ebf4063e 2030 if (vs)
012a5729 2031 vxlan_sock_release(vs);
ebf4063e
SH		 2032 free_percpu(dev->tstats);
2033}
2034
d342894c 2035/* Start ageing timer and join group when device is brought up */
2036static int vxlan_open(struct net_device *dev)
2037{
2038 struct vxlan_dev *vxlan = netdev_priv(dev);
1c51a915
SH		 2039 struct vxlan_sock *vs = vxlan->vn_sock;
2040
2041 /* socket hasn't been created */
2042 if (!vs)
2043 return -ENOTCONN;
d342894c 2044
79d4a94f 2045 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
1c51a915 2046 vxlan_sock_hold(vs);
7c47cedf 2047 dev_hold(dev);
3fc2de2f 2048 queue_work(vxlan_wq, &vxlan->igmp_join);
d342894c 2049 }
2050
2051 if (vxlan->age_interval)
2052 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2053
2054 return 0;
2055}
2056
2057/* Purge the forwarding table */
2058static void vxlan_flush(struct vxlan_dev *vxlan)
2059{
31fec5aa 2060 unsigned int h;
d342894c 2061
2062 spin_lock_bh(&vxlan->hash_lock);
2063 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2064 struct hlist_node *p, *n;
2065 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2066 struct vxlan_fdb *f
2067 = container_of(p, struct vxlan_fdb, hlist);
afbd8bae
MR		 2068 /* the all_zeros_mac entry is deleted at vxlan_uninit */
2069 if (!is_zero_ether_addr(f->eth_addr))
2070 vxlan_fdb_destroy(vxlan, f);
d342894c 2071 }
2072 }
2073 spin_unlock_bh(&vxlan->hash_lock);
2074}
2075
2076/* Cleanup timer and forwarding table on shutdown */
2077static int vxlan_stop(struct net_device *dev)
2078{
2079 struct vxlan_dev *vxlan = netdev_priv(dev);
f01ec1c0 2080 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
1c51a915 2081 struct vxlan_sock *vs = vxlan->vn_sock;
d342894c 2082
e4c7ed41 2083 if (vs && vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
95ab0991 2084 !vxlan_group_used(vn, vxlan)) {
1c51a915 2085 vxlan_sock_hold(vs);
7c47cedf 2086 dev_hold(dev);
3fc2de2f 2087 queue_work(vxlan_wq, &vxlan->igmp_leave);
7c47cedf 2088 }
d342894c 2089
2090 del_timer_sync(&vxlan->age_timer);
2091
2092 vxlan_flush(vxlan);
2093
2094 return 0;
2095}
2096
d342894c 2097/* Stub, nothing needs to be done. */
2098static void vxlan_set_multicast_list(struct net_device *dev)
2099{
2100}
2101
345010b5
DB		 2102static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2103{
2104 struct vxlan_dev *vxlan = netdev_priv(dev);
2105 struct vxlan_rdst *dst = &vxlan->default_dst;
2106 struct net_device *lowerdev;
2107 int max_mtu;
2108
f01ec1c0 2109 lowerdev = __dev_get_by_index(vxlan->net, dst->remote_ifindex);
345010b5
DB		 2110 if (lowerdev == NULL)
2111 return eth_change_mtu(dev, new_mtu);
2112
2113 if (dst->remote_ip.sa.sa_family == AF_INET6)
2114 max_mtu = lowerdev->mtu - VXLAN6_HEADROOM;
2115 else
2116 max_mtu = lowerdev->mtu - VXLAN_HEADROOM;
2117
2118 if (new_mtu < 68 || new_mtu > max_mtu)
2119 return -EINVAL;
2120
2121 dev->mtu = new_mtu;
2122 return 0;
2123}
2124
d342894c 2125static const struct net_device_ops vxlan_netdev_ops = {
2126 .ndo_init = vxlan_init,
ebf4063e 2127 .ndo_uninit = vxlan_uninit,
d342894c 2128 .ndo_open = vxlan_open,
2129 .ndo_stop = vxlan_stop,
2130 .ndo_start_xmit = vxlan_xmit,
e8171045 2131 .ndo_get_stats64 = ip_tunnel_get_stats64,
d342894c 2132 .ndo_set_rx_mode = vxlan_set_multicast_list,
345010b5 2133 .ndo_change_mtu = vxlan_change_mtu,
d342894c 2134 .ndo_validate_addr = eth_validate_addr,
2135 .ndo_set_mac_address = eth_mac_addr,
2136 .ndo_fdb_add = vxlan_fdb_add,
2137 .ndo_fdb_del = vxlan_fdb_delete,
2138 .ndo_fdb_dump = vxlan_fdb_dump,
2139};
2140
2141/* Info for udev, that this is a virtual tunnel endpoint */
2142static struct device_type vxlan_type = {
2143 .name = "vxlan",
2144};
2145
53cf5275 2146/* Calls the ndo_add_vxlan_port of the caller in order to
35e42379
JG		 2147 * supply the listening VXLAN udp ports. Callers are expected
2148 * to implement the ndo_add_vxlan_port.
53cf5275
JG		 2149 */
2150void vxlan_get_rx_port(struct net_device *dev)
2151{
2152 struct vxlan_sock *vs;
2153 struct net *net = dev_net(dev);
2154 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2155 sa_family_t sa_family;
35e42379
JG		 2156 __be16 port;
2157 unsigned int i;
53cf5275
JG		 2158
2159 spin_lock(&vn->sock_lock);
2160 for (i = 0; i < PORT_HASH_SIZE; ++i) {
35e42379
JG		 2161 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2162 port = inet_sk(vs->sock->sk)->inet_sport;
53cf5275
JG		 2163 sa_family = vs->sock->sk->sk_family;
2164 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
2165 port);
2166 }
2167 }
2168 spin_unlock(&vn->sock_lock);
2169}
2170EXPORT_SYMBOL_GPL(vxlan_get_rx_port);
2171
d342894c 2172/* Initialize the device structure. */
2173static void vxlan_setup(struct net_device *dev)
2174{
2175 struct vxlan_dev *vxlan = netdev_priv(dev);
31fec5aa 2176 unsigned int h;
d342894c 2177
2178 eth_hw_addr_random(dev);
2179 ether_setup(dev);
e4c7ed41 2180 if (vxlan->default_dst.remote_ip.sa.sa_family == AF_INET6)
2853af6a 2181 dev->needed_headroom = ETH_HLEN + VXLAN6_HEADROOM;
e4c7ed41 2182 else
2853af6a 2183 dev->needed_headroom = ETH_HLEN + VXLAN_HEADROOM;
d342894c 2184
2185 dev->netdev_ops = &vxlan_netdev_ops;
ebf4063e 2186 dev->destructor = free_netdev;
d342894c 2187 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2188
2189 dev->tx_queue_len = 0;
2190 dev->features |= NETIF_F_LLTX;
d6727fe3 2191 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
0afb1666 2192 dev->features |= NETIF_F_RXCSUM;
05c0db08 2193 dev->features |= NETIF_F_GSO_SOFTWARE;
0afb1666 2194
1eaa8178
PS		 2195 dev->vlan_features = dev->features;
2196 dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
0afb1666 2197 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
05c0db08 2198 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1eaa8178 2199 dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
02875878 2200 netif_keep_dst(dev);
6602d007 2201 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
d342894c 2202
553675fb 2203 INIT_LIST_HEAD(&vxlan->next);
d342894c 2204 spin_lock_init(&vxlan->hash_lock);
3fc2de2f 2205 INIT_WORK(&vxlan->igmp_join, vxlan_igmp_join);
2206 INIT_WORK(&vxlan->igmp_leave, vxlan_igmp_leave);
1c51a915 2207 INIT_WORK(&vxlan->sock_work, vxlan_sock_work);
d342894c 2208
2209 init_timer_deferrable(&vxlan->age_timer);
2210 vxlan->age_timer.function = vxlan_cleanup;
2211 vxlan->age_timer.data = (unsigned long) vxlan;
2212
823aa873 2213 vxlan->dst_port = htons(vxlan_port);
05f47d69 2214
d342894c 2215 vxlan->dev = dev;
2216
2217 for (h = 0; h < FDB_HASH_SIZE; ++h)
2218 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2219}
2220
2221static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2222 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
5d174dd8 2223 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
e4c7ed41 2224 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
d342894c 2225 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
2226 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
e4c7ed41 2227 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
d342894c 2228 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
2229 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
2230 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
2231 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
2232 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
05f47d69 2233 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
e4f67add
DS		 2234 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
2235 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
2236 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
2237 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
823aa873 2238 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
d342894c 2239};
2240
2241static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2242{
2243 if (tb[IFLA_ADDRESS]) {
2244 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2245 pr_debug("invalid link address (not ethernet)\n");
2246 return -EINVAL;
2247 }
2248
2249 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2250 pr_debug("invalid all zero ethernet address\n");
2251 return -EADDRNOTAVAIL;
2252 }
2253 }
2254
2255 if (!data)
2256 return -EINVAL;
2257
2258 if (data[IFLA_VXLAN_ID]) {
2259 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2260 if (id >= VXLAN_VID_MASK)
2261 return -ERANGE;
2262 }
2263
05f47d69 2264 if (data[IFLA_VXLAN_PORT_RANGE]) {
2265 const struct ifla_vxlan_port_range *p
2266 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2267
2268 if (ntohs(p->high) < ntohs(p->low)) {
2269 pr_debug("port range %u .. %u not valid\n",
2270 ntohs(p->low), ntohs(p->high));
2271 return -EINVAL;
2272 }
2273 }
2274
d342894c 2275 return 0;
2276}
2277
1b13c97f
YB		 2278static void vxlan_get_drvinfo(struct net_device *netdev,
2279 struct ethtool_drvinfo *drvinfo)
2280{
2281 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2282 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2283}
2284
2285static const struct ethtool_ops vxlan_ethtool_ops = {
2286 .get_drvinfo = vxlan_get_drvinfo,
2287 .get_link = ethtool_op_get_link,
2288};
2289
553675fb 2290static void vxlan_del_work(struct work_struct *work)
2291{
2292 struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
acbf74a7 2293 udp_tunnel_sock_release(vs->sock);
553675fb 2294 kfree_rcu(vs, rcu);
2295}
2296
3ee64f39
TH		 2297static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2298 __be16 port, u32 flags)
553675fb 2299{
e4c7ed41 2300 struct socket *sock;
3ee64f39
TH		 2301 struct udp_port_cfg udp_conf;
2302 int err;
e4c7ed41 2303
3ee64f39 2304 memset(&udp_conf, 0, sizeof(udp_conf));
e4c7ed41 2305
3ee64f39
TH		 2306 if (ipv6) {
2307 udp_conf.family = AF_INET6;
2308 udp_conf.use_udp6_tx_checksums =
2309 !!(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2310 udp_conf.use_udp6_rx_checksums =
2311 !!(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2312 } else {
2313 udp_conf.family = AF_INET;
2314 udp_conf.local_ip.s_addr = INADDR_ANY;
2315 udp_conf.use_udp_checksums =
2316 !!(flags & VXLAN_F_UDP_CSUM);
e4c7ed41 2317 }
e4c7ed41 2318
3ee64f39 2319 udp_conf.local_udp_port = port;
553675fb 2320
3ee64f39
TH		 2321 /* Open UDP socket */
2322 err = udp_sock_create(net, &udp_conf, &sock);
2323 if (err < 0)
2324 return ERR_PTR(err);
e4c7ed41 2325
39deb2c7 2326 return sock;
e4c7ed41
CW		 2327}
2328
2329/* Create new listen socket if needed */
2330static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port,
359a0ea9
TH		 2331 vxlan_rcv_t *rcv, void *data,
2332 u32 flags)
e4c7ed41
CW		 2333{
2334 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2335 struct vxlan_sock *vs;
2336 struct socket *sock;
e4c7ed41 2337 unsigned int h;
359a0ea9 2338 bool ipv6 = !!(flags & VXLAN_F_IPV6);
acbf74a7 2339 struct udp_tunnel_sock_cfg tunnel_cfg;
e4c7ed41 2340
dc01e7d3 2341 vs = kzalloc(sizeof(*vs), GFP_KERNEL);
e4c7ed41
CW		 2342 if (!vs)
2343 return ERR_PTR(-ENOMEM);
2344
2345 for (h = 0; h < VNI_HASH_SIZE; ++h)
2346 INIT_HLIST_HEAD(&vs->vni_list[h]);
2347
2348 INIT_WORK(&vs->del_work, vxlan_del_work);
2349
3ee64f39 2350 sock = vxlan_create_sock(net, ipv6, port, flags);
39deb2c7 2351 if (IS_ERR(sock)) {
553675fb 2352 kfree(vs);
e50fddc8 2353 return ERR_CAST(sock);
553675fb 2354 }
e4c7ed41
CW		 2355
2356 vs->sock = sock;
9c2e24e1 2357 atomic_set(&vs->refcnt, 1);
5cfccc5a 2358 vs->rcv = rcv;
012a5729 2359 vs->data = data;
553675fb 2360
dc01e7d3
OG		 2361 /* Initialize the vxlan udp offloads structure */
2362 vs->udp_offloads.port = port;
2363 vs->udp_offloads.callbacks.gro_receive = vxlan_gro_receive;
2364 vs->udp_offloads.callbacks.gro_complete = vxlan_gro_complete;
2365
9c2e24e1
PS		 2366 spin_lock(&vn->sock_lock);
2367 hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
dc01e7d3 2368 vxlan_notify_add_rx_port(vs);
9c2e24e1 2369 spin_unlock(&vn->sock_lock);
553675fb 2370
2371 /* Mark socket as an encapsulation socket. */
acbf74a7
AZ		 2372 tunnel_cfg.sk_user_data = vs;
2373 tunnel_cfg.encap_type = 1;
2374 tunnel_cfg.encap_rcv = vxlan_udp_encap_recv;
2375 tunnel_cfg.encap_destroy = NULL;
2376
2377 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
e4c7ed41 2378
9c2e24e1
PS		 2379 return vs;
2380}
2381
012a5729
PS		 2382struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port,
2383 vxlan_rcv_t *rcv, void *data,
359a0ea9 2384 bool no_share, u32 flags)
9c2e24e1
PS		 2385{
2386 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2387 struct vxlan_sock *vs;
19ca9fc1 2388 bool ipv6 = flags & VXLAN_F_IPV6;
9c2e24e1 2389
359a0ea9 2390 vs = vxlan_socket_create(net, port, rcv, data, flags);
9c2e24e1
PS		 2391 if (!IS_ERR(vs))
2392 return vs;
553675fb 2393
012a5729
PS		 2394 if (no_share) /* Return error if sharing is not allowed. */
2395 return vs;
2396
9c2e24e1 2397 spin_lock(&vn->sock_lock);
19ca9fc1 2398 vs = vxlan_find_sock(net, ipv6 ? AF_INET6 : AF_INET, port);
5cfccc5a
PS		 2399 if (vs) {
2400 if (vs->rcv == rcv)
2401 atomic_inc(&vs->refcnt);
2402 else
2403 vs = ERR_PTR(-EBUSY);
2404 }
2405 spin_unlock(&vn->sock_lock);
2406
2407 if (!vs)
9c2e24e1
PS		 2408 vs = ERR_PTR(-EINVAL);
2409
553675fb 2410 return vs;
2411}
012a5729 2412EXPORT_SYMBOL_GPL(vxlan_sock_add);
553675fb 2413
1c51a915
SH		 2414/* Scheduled at device creation to bind to a socket */
2415static void vxlan_sock_work(struct work_struct *work)
2416{
9c2e24e1 2417 struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, sock_work);
f01ec1c0 2418 struct net *net = vxlan->net;
1c51a915 2419 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
9c2e24e1
PS		 2420 __be16 port = vxlan->dst_port;
2421 struct vxlan_sock *nvs;
1c51a915 2422
359a0ea9 2423 nvs = vxlan_sock_add(net, port, vxlan_rcv, NULL, false, vxlan->flags);
1c51a915 2424 spin_lock(&vn->sock_lock);
9c2e24e1
PS		 2425 if (!IS_ERR(nvs))
2426 vxlan_vs_add_dev(nvs, vxlan);
2427 spin_unlock(&vn->sock_lock);
2428
2429 dev_put(vxlan->dev);
1c51a915
SH		 2430}
2431
d342894c 2432static int vxlan_newlink(struct net *net, struct net_device *dev,
2433 struct nlattr *tb[], struct nlattr *data[])
2434{
553675fb 2435 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
d342894c 2436 struct vxlan_dev *vxlan = netdev_priv(dev);
c7995c43 2437 struct vxlan_rdst *dst = &vxlan->default_dst;
d342894c 2438 __u32 vni;
2439 int err;
e4c7ed41 2440 bool use_ipv6 = false;
d342894c 2441
2442 if (!data[IFLA_VXLAN_ID])
2443 return -EINVAL;
2444
f01ec1c0
ND		 2445 vxlan->net = dev_net(dev);
2446
d342894c 2447 vni = nla_get_u32(data[IFLA_VXLAN_ID]);
c7995c43 2448 dst->remote_vni = vni;
d342894c 2449
5933a7bb
MR		 2450 /* Unless IPv6 is explicitly requested, assume IPv4 */
2451 dst->remote_ip.sa.sa_family = AF_INET;
e4c7ed41
CW		 2452 if (data[IFLA_VXLAN_GROUP]) {
2453 dst->remote_ip.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_GROUP]);
e4c7ed41
CW		 2454 } else if (data[IFLA_VXLAN_GROUP6]) {
2455 if (!IS_ENABLED(CONFIG_IPV6))
2456 return -EPFNOSUPPORT;
2457
2458 nla_memcpy(&dst->remote_ip.sin6.sin6_addr, data[IFLA_VXLAN_GROUP6],
2459 sizeof(struct in6_addr));
2460 dst->remote_ip.sa.sa_family = AF_INET6;
2461 use_ipv6 = true;
2462 }
d342894c 2463
e4c7ed41
CW		 2464 if (data[IFLA_VXLAN_LOCAL]) {
2465 vxlan->saddr.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_LOCAL]);
2466 vxlan->saddr.sa.sa_family = AF_INET;
2467 } else if (data[IFLA_VXLAN_LOCAL6]) {
2468 if (!IS_ENABLED(CONFIG_IPV6))
2469 return -EPFNOSUPPORT;
2470
2471 /* TODO: respect scope id */
2472 nla_memcpy(&vxlan->saddr.sin6.sin6_addr, data[IFLA_VXLAN_LOCAL6],
2473 sizeof(struct in6_addr));
2474 vxlan->saddr.sa.sa_family = AF_INET6;
2475 use_ipv6 = true;
2476 }
d342894c 2477
34e02aa1 2478 if (data[IFLA_VXLAN_LINK] &&
c7995c43 2479 (dst->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]))) {
34e02aa1 2480 struct net_device *lowerdev
c7995c43 2481 = __dev_get_by_index(net, dst->remote_ifindex);
34e02aa1 2482
2483 if (!lowerdev) {
c7995c43 2484 pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
34e02aa1 2485 return -ENODEV;
2486 }
d342894c 2487
e4c7ed41
CW		 2488#if IS_ENABLED(CONFIG_IPV6)
2489 if (use_ipv6) {
2490 struct inet6_dev *idev = __in6_dev_get(lowerdev);
2491 if (idev && idev->cnf.disable_ipv6) {
2492 pr_info("IPv6 is disabled via sysctl\n");
2493 return -EPERM;
2494 }
2495 vxlan->flags |= VXLAN_F_IPV6;
2496 }
2497#endif
2498
34e02aa1 2499 if (!tb[IFLA_MTU])
e4c7ed41 2500 dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
1ba56fb4 2501
2853af6a 2502 dev->needed_headroom = lowerdev->hard_header_len +
e4c7ed41 2503 (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
7bda701e 2504 } else if (use_ipv6)
2505 vxlan->flags |= VXLAN_F_IPV6;
d342894c 2506
2507 if (data[IFLA_VXLAN_TOS])
2508 vxlan->tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
2509
afb97186
VB		 2510 if (data[IFLA_VXLAN_TTL])
2511 vxlan->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
2512
d342894c 2513 if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
e4f67add 2514 vxlan->flags |= VXLAN_F_LEARN;
d342894c 2515
2516 if (data[IFLA_VXLAN_AGEING])
2517 vxlan->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
2518 else
2519 vxlan->age_interval = FDB_AGE_DEFAULT;
2520
e4f67add
DS		 2521 if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
2522 vxlan->flags |= VXLAN_F_PROXY;
2523
2524 if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
2525 vxlan->flags |= VXLAN_F_RSC;
2526
2527 if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
2528 vxlan->flags |= VXLAN_F_L2MISS;
2529
2530 if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
2531 vxlan->flags |= VXLAN_F_L3MISS;
2532
d342894c 2533 if (data[IFLA_VXLAN_LIMIT])
2534 vxlan->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
2535
05f47d69 2536 if (data[IFLA_VXLAN_PORT_RANGE]) {
2537 const struct ifla_vxlan_port_range *p
2538 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2539 vxlan->port_min = ntohs(p->low);
2540 vxlan->port_max = ntohs(p->high);
2541 }
2542
823aa873 2543 if (data[IFLA_VXLAN_PORT])
2544 vxlan->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
2545
359a0ea9
TH		 2546 if (data[IFLA_VXLAN_UDP_CSUM] && nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
2547 vxlan->flags |= VXLAN_F_UDP_CSUM;
2548
2549 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
2550 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
2551 vxlan->flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
2552
2553 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
2554 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
2555 vxlan->flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
2556
19ca9fc1
ML		 2557 if (vxlan_find_vni(net, vni, use_ipv6 ? AF_INET6 : AF_INET,
2558 vxlan->dst_port)) {
553675fb 2559 pr_info("duplicate VNI %u\n", vni);
2560 return -EEXIST;
2561 }
2562
7ad24ea4 2563 dev->ethtool_ops = &vxlan_ethtool_ops;
1b13c97f 2564
2936b6ab
SS		 2565 /* create an fdb entry for a valid default destination */
2566 if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2567 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2568 &vxlan->default_dst.remote_ip,
2569 NUD_REACHABLE|NUD_PERMANENT,
2570 NLM_F_EXCL|NLM_F_CREATE,
2571 vxlan->dst_port,
2572 vxlan->default_dst.remote_vni,
2573 vxlan->default_dst.remote_ifindex,
2574 NTF_SELF);
2575 if (err)
2576 return err;
2577 }
d342894c 2578
afbd8bae
MR		 2579 err = register_netdevice(dev);
2580 if (err) {
ba609e9b 2581 vxlan_fdb_delete_default(vxlan);
afbd8bae
MR		 2582 return err;
2583 }
2584
553675fb 2585 list_add(&vxlan->next, &vn->vxlan_list);
553675fb 2586
2587 return 0;
d342894c 2588}
2589
2590static void vxlan_dellink(struct net_device *dev, struct list_head *head)
2591{
2592 struct vxlan_dev *vxlan = netdev_priv(dev);
f01ec1c0 2593 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
d342894c 2594
fe5c3561 2595 spin_lock(&vn->sock_lock);
9c2e24e1
PS		 2596 if (!hlist_unhashed(&vxlan->hlist))
2597 hlist_del_rcu(&vxlan->hlist);
fe5c3561 2598 spin_unlock(&vn->sock_lock);
2599
553675fb 2600 list_del(&vxlan->next);
d342894c 2601 unregister_netdevice_queue(dev, head);
2602}
2603
2604static size_t vxlan_get_size(const struct net_device *dev)
2605{
2606
2607 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
e4c7ed41 2608 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
d342894c 2609 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
e4c7ed41 2610 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
d342894c 2611 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
2612 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
2613 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
e4f67add
DS		 2614 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
2615 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
2616 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
2617 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
d342894c 2618 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
2619 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
05f47d69 2620 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
359a0ea9
TH		 2621 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
2622 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
2623 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
2624 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
d342894c 2625 0;
2626}
2627
2628static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
2629{
2630 const struct vxlan_dev *vxlan = netdev_priv(dev);
c7995c43 2631 const struct vxlan_rdst *dst = &vxlan->default_dst;
05f47d69 2632 struct ifla_vxlan_port_range ports = {
2633 .low = htons(vxlan->port_min),
2634 .high = htons(vxlan->port_max),
2635 };
d342894c 2636
c7995c43 2637 if (nla_put_u32(skb, IFLA_VXLAN_ID, dst->remote_vni))
d342894c 2638 goto nla_put_failure;
2639
e4c7ed41
CW		 2640 if (!vxlan_addr_any(&dst->remote_ip)) {
2641 if (dst->remote_ip.sa.sa_family == AF_INET) {
2642 if (nla_put_be32(skb, IFLA_VXLAN_GROUP,
2643 dst->remote_ip.sin.sin_addr.s_addr))
2644 goto nla_put_failure;
2645#if IS_ENABLED(CONFIG_IPV6)
2646 } else {
2647 if (nla_put(skb, IFLA_VXLAN_GROUP6, sizeof(struct in6_addr),
2648 &dst->remote_ip.sin6.sin6_addr))
2649 goto nla_put_failure;
2650#endif
2651 }
2652 }
d342894c 2653
c7995c43 2654 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
d342894c 2655 goto nla_put_failure;
2656
e4c7ed41
CW		 2657 if (!vxlan_addr_any(&vxlan->saddr)) {
2658 if (vxlan->saddr.sa.sa_family == AF_INET) {
2659 if (nla_put_be32(skb, IFLA_VXLAN_LOCAL,
2660 vxlan->saddr.sin.sin_addr.s_addr))
2661 goto nla_put_failure;
2662#if IS_ENABLED(CONFIG_IPV6)
2663 } else {
2664 if (nla_put(skb, IFLA_VXLAN_LOCAL6, sizeof(struct in6_addr),
2665 &vxlan->saddr.sin6.sin6_addr))
2666 goto nla_put_failure;
2667#endif
2668 }
2669 }
d342894c 2670
2671 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->ttl) ||
2672 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->tos) ||
e4f67add
DS		 2673 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
2674 !!(vxlan->flags & VXLAN_F_LEARN)) ||
2675 nla_put_u8(skb, IFLA_VXLAN_PROXY,
2676 !!(vxlan->flags & VXLAN_F_PROXY)) ||
2677 nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
2678 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
2679 !!(vxlan->flags & VXLAN_F_L2MISS)) ||
2680 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
2681 !!(vxlan->flags & VXLAN_F_L3MISS)) ||
d342894c 2682 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->age_interval) ||
823aa873 2683 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->addrmax) ||
359a0ea9
TH		 2684 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->dst_port) ||
2685 nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
2686 !!(vxlan->flags & VXLAN_F_UDP_CSUM)) ||
2687 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
2688 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
2689 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
2690 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)))
d342894c 2691 goto nla_put_failure;
2692
05f47d69 2693 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
2694 goto nla_put_failure;
2695
d342894c 2696 return 0;
2697
2698nla_put_failure:
2699 return -EMSGSIZE;
2700}
2701
2702static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
2703 .kind = "vxlan",
2704 .maxtype = IFLA_VXLAN_MAX,
2705 .policy = vxlan_policy,
2706 .priv_size = sizeof(struct vxlan_dev),
2707 .setup = vxlan_setup,
2708 .validate = vxlan_validate,
2709 .newlink = vxlan_newlink,
2710 .dellink = vxlan_dellink,
2711 .get_size = vxlan_get_size,
2712 .fill_info = vxlan_fill_info,
2713};
2714
acaf4e70
DB		 2715static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
2716 struct net_device *dev)
2717{
2718 struct vxlan_dev *vxlan, *next;
2719 LIST_HEAD(list_kill);
2720
2721 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
2722 struct vxlan_rdst *dst = &vxlan->default_dst;
2723
2724 /* In case we created vxlan device with carrier
2725 * and we loose the carrier due to module unload
2726 * we also need to remove vxlan device. In other
2727 * cases, it's not necessary and remote_ifindex
2728 * is 0 here, so no matches.
2729 */
2730 if (dst->remote_ifindex == dev->ifindex)
2731 vxlan_dellink(vxlan->dev, &list_kill);
2732 }
2733
2734 unregister_netdevice_many(&list_kill);
2735}
2736
2737static int vxlan_lowerdev_event(struct notifier_block *unused,
2738 unsigned long event, void *ptr)
2739{
2740 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
783c1463 2741 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
acaf4e70 2742
783c1463 2743 if (event == NETDEV_UNREGISTER)
acaf4e70
DB		 2744 vxlan_handle_lowerdev_unregister(vn, dev);
2745
2746 return NOTIFY_DONE;
2747}
2748
2749static struct notifier_block vxlan_notifier_block __read_mostly = {
2750 .notifier_call = vxlan_lowerdev_event,
2751};
2752
d342894c 2753static __net_init int vxlan_init_net(struct net *net)
2754{
2755 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
31fec5aa 2756 unsigned int h;
d342894c 2757
553675fb 2758 INIT_LIST_HEAD(&vn->vxlan_list);
1c51a915 2759 spin_lock_init(&vn->sock_lock);
d342894c 2760
553675fb 2761 for (h = 0; h < PORT_HASH_SIZE; ++h)
2762 INIT_HLIST_HEAD(&vn->sock_list[h]);
d342894c 2763
2764 return 0;
2765}
2766
f01ec1c0
ND		 2767static void __net_exit vxlan_exit_net(struct net *net)
2768{
2769 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2770 struct vxlan_dev *vxlan, *next;
2771 struct net_device *dev, *aux;
2772 LIST_HEAD(list);
2773
2774 rtnl_lock();
2775 for_each_netdev_safe(net, dev, aux)
2776 if (dev->rtnl_link_ops == &vxlan_link_ops)
2777 unregister_netdevice_queue(dev, &list);
2778
2779 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
2780 /* If vxlan->dev is in the same netns, it has already been added
2781 * to the list by the previous loop.
2782 */
2783 if (!net_eq(dev_net(vxlan->dev), net))
2784 unregister_netdevice_queue(dev, &list);
2785 }
2786
2787 unregister_netdevice_many(&list);
2788 rtnl_unlock();
2789}
2790
d342894c 2791static struct pernet_operations vxlan_net_ops = {
2792 .init = vxlan_init_net,
f01ec1c0 2793 .exit = vxlan_exit_net,
d342894c 2794 .id = &vxlan_net_id,
2795 .size = sizeof(struct vxlan_net),
2796};
2797
2798static int __init vxlan_init_module(void)
2799{
2800 int rc;
2801
758c57d1
SH		 2802 vxlan_wq = alloc_workqueue("vxlan", 0, 0);
2803 if (!vxlan_wq)
2804 return -ENOMEM;
2805
d342894c 2806 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
2807
783c1463 2808 rc = register_pernet_subsys(&vxlan_net_ops);
d342894c 2809 if (rc)
2810 goto out1;
2811
acaf4e70 2812 rc = register_netdevice_notifier(&vxlan_notifier_block);
d342894c 2813 if (rc)
2814 goto out2;
2815
acaf4e70
DB		 2816 rc = rtnl_link_register(&vxlan_link_ops);
2817 if (rc)
2818 goto out3;
d342894c 2819
acaf4e70
DB		 2820 return 0;
2821out3:
2822 unregister_netdevice_notifier(&vxlan_notifier_block);
d342894c 2823out2:
783c1463 2824 unregister_pernet_subsys(&vxlan_net_ops);
d342894c 2825out1:
758c57d1 2826 destroy_workqueue(vxlan_wq);
d342894c 2827 return rc;
2828}
7332a13b 2829late_initcall(vxlan_init_module);
d342894c 2830
2831static void __exit vxlan_cleanup_module(void)
2832{
b7153984 2833 rtnl_link_unregister(&vxlan_link_ops);
acaf4e70 2834 unregister_netdevice_notifier(&vxlan_notifier_block);
758c57d1 2835 destroy_workqueue(vxlan_wq);
783c1463
DB		 2836 unregister_pernet_subsys(&vxlan_net_ops);
2837 /* rcu_barrier() is called by netns */
d342894c 2838}
2839module_exit(vxlan_cleanup_module);
2840
2841MODULE_LICENSE("GPL");
2842MODULE_VERSION(VXLAN_VERSION);
3b8df3c6 2843MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
ead5139a 2844MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
d342894c 2845MODULE_ALIAS_RTNL_LINK("vxlan");
Ubuntu Focal Linux kernel mirror