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udp-tunnel: Add a few more UDP tunnel APIs
[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>
e4c7ed41
CW		 45#if IS_ENABLED(CONFIG_IPV6)
46#include <net/ipv6.h>
47#include <net/addrconf.h>
48#include <net/ip6_tunnel.h>
660d98ca 49#include <net/ip6_checksum.h>
e4c7ed41 50#endif
d342894c 51
52#define VXLAN_VERSION "0.1"
53
553675fb 54#define PORT_HASH_BITS 8
55#define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
d342894c 56#define VNI_HASH_BITS 10
57#define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
58#define FDB_HASH_BITS 8
59#define FDB_HASH_SIZE (1<<FDB_HASH_BITS)
60#define FDB_AGE_DEFAULT 300 /* 5 min */
61#define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
62
63#define VXLAN_N_VID (1u << 24)
64#define VXLAN_VID_MASK (VXLAN_N_VID - 1)
7ce04758 65#define VXLAN_HLEN (sizeof(struct udphdr) + sizeof(struct vxlanhdr))
d342894c 66
67#define VXLAN_FLAGS 0x08000000 /* struct vxlanhdr.vx_flags required value. */
68
69/* VXLAN protocol header */
70struct vxlanhdr {
71 __be32 vx_flags;
72 __be32 vx_vni;
73};
74
23c578bf 75/* UDP port for VXLAN traffic.
76 * The IANA assigned port is 4789, but the Linux default is 8472
234f5b73 77 * for compatibility with early adopters.
23c578bf 78 */
9daaa397
SH		 79static unsigned short vxlan_port __read_mostly = 8472;
80module_param_named(udp_port, vxlan_port, ushort, 0444);
d342894c 81MODULE_PARM_DESC(udp_port, "Destination UDP port");
82
83static bool log_ecn_error = true;
84module_param(log_ecn_error, bool, 0644);
85MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
86
60d9d4c6 87static int vxlan_net_id;
553675fb 88
afbd8bae
MR		 89static const u8 all_zeros_mac[ETH_ALEN];
90
553675fb 91/* per-network namespace private data for this module */
92struct vxlan_net {
93 struct list_head vxlan_list;
94 struct hlist_head sock_list[PORT_HASH_SIZE];
1c51a915 95 spinlock_t sock_lock;
553675fb 96};
97
e4c7ed41
CW		 98union vxlan_addr {
99 struct sockaddr_in sin;
100 struct sockaddr_in6 sin6;
101 struct sockaddr sa;
102};
103
6681712d 104struct vxlan_rdst {
e4c7ed41 105 union vxlan_addr remote_ip;
6681712d
DS		 106 __be16 remote_port;
107 u32 remote_vni;
108 u32 remote_ifindex;
3e61aa8f 109 struct list_head list;
bc7892ba 110 struct rcu_head rcu;
6681712d
DS		 111};
112
d342894c 113/* Forwarding table entry */
114struct vxlan_fdb {
115 struct hlist_node hlist; /* linked list of entries */
116 struct rcu_head rcu;
117 unsigned long updated; /* jiffies */
118 unsigned long used;
3e61aa8f 119 struct list_head remotes;
d342894c 120 u16 state; /* see ndm_state */
ae884082 121 u8 flags; /* see ndm_flags */
d342894c 122 u8 eth_addr[ETH_ALEN];
123};
124
d342894c 125/* Pseudo network device */
126struct vxlan_dev {
553675fb 127 struct hlist_node hlist; /* vni hash table */
128 struct list_head next; /* vxlan's per namespace list */
129 struct vxlan_sock *vn_sock; /* listening socket */
d342894c 130 struct net_device *dev;
f01ec1c0 131 struct net *net; /* netns for packet i/o */
c7995c43 132 struct vxlan_rdst default_dst; /* default destination */
e4c7ed41 133 union vxlan_addr saddr; /* source address */
823aa873 134 __be16 dst_port;
05f47d69 135 __u16 port_min; /* source port range */
136 __u16 port_max;
d342894c 137 __u8 tos; /* TOS override */
138 __u8 ttl;
359a0ea9 139 u32 flags; /* VXLAN_F_* in vxlan.h */
d342894c 140
1c51a915 141 struct work_struct sock_work;
3fc2de2f 142 struct work_struct igmp_join;
143 struct work_struct igmp_leave;
1c51a915 144
d342894c 145 unsigned long age_interval;
146 struct timer_list age_timer;
147 spinlock_t hash_lock;
148 unsigned int addrcnt;
149 unsigned int addrmax;
d342894c 150
151 struct hlist_head fdb_head[FDB_HASH_SIZE];
152};
153
154/* salt for hash table */
155static u32 vxlan_salt __read_mostly;
758c57d1 156static struct workqueue_struct *vxlan_wq;
d342894c 157
1c51a915
SH		 158static void vxlan_sock_work(struct work_struct *work);
159
e4c7ed41
CW		 160#if IS_ENABLED(CONFIG_IPV6)
161static inline
162bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
163{
164 if (a->sa.sa_family != b->sa.sa_family)
165 return false;
166 if (a->sa.sa_family == AF_INET6)
167 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
168 else
169 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
170}
171
172static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
173{
174 if (ipa->sa.sa_family == AF_INET6)
175 return ipv6_addr_any(&ipa->sin6.sin6_addr);
176 else
177 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
178}
179
180static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
181{
182 if (ipa->sa.sa_family == AF_INET6)
183 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
184 else
185 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
186}
187
188static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
189{
190 if (nla_len(nla) >= sizeof(struct in6_addr)) {
191 nla_memcpy(&ip->sin6.sin6_addr, nla, sizeof(struct in6_addr));
192 ip->sa.sa_family = AF_INET6;
193 return 0;
194 } else if (nla_len(nla) >= sizeof(__be32)) {
195 ip->sin.sin_addr.s_addr = nla_get_be32(nla);
196 ip->sa.sa_family = AF_INET;
197 return 0;
198 } else {
199 return -EAFNOSUPPORT;
200 }
201}
202
203static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
204 const union vxlan_addr *ip)
205{
206 if (ip->sa.sa_family == AF_INET6)
207 return nla_put(skb, attr, sizeof(struct in6_addr), &ip->sin6.sin6_addr);
208 else
209 return nla_put_be32(skb, attr, ip->sin.sin_addr.s_addr);
210}
211
212#else /* !CONFIG_IPV6 */
213
214static inline
215bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
216{
217 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
218}
219
220static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
221{
222 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
223}
224
225static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
226{
227 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
228}
229
230static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
231{
232 if (nla_len(nla) >= sizeof(struct in6_addr)) {
233 return -EAFNOSUPPORT;
234 } else if (nla_len(nla) >= sizeof(__be32)) {
235 ip->sin.sin_addr.s_addr = nla_get_be32(nla);
236 ip->sa.sa_family = AF_INET;
237 return 0;
238 } else {
239 return -EAFNOSUPPORT;
240 }
241}
242
243static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
244 const union vxlan_addr *ip)
245{
246 return nla_put_be32(skb, attr, ip->sin.sin_addr.s_addr);
247}
248#endif
249
553675fb 250/* Virtual Network hash table head */
251static inline struct hlist_head *vni_head(struct vxlan_sock *vs, u32 id)
252{
253 return &vs->vni_list[hash_32(id, VNI_HASH_BITS)];
254}
255
256/* Socket hash table head */
257static inline struct hlist_head *vs_head(struct net *net, __be16 port)
d342894c 258{
259 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
260
553675fb 261 return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
262}
263
3e61aa8f
SH		 264/* First remote destination for a forwarding entry.
265 * Guaranteed to be non-NULL because remotes are never deleted.
266 */
5ca5461c 267static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
3e61aa8f 268{
5ca5461c 269 return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
270}
271
272static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
273{
274 return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
3e61aa8f
SH		 275}
276
553675fb 277/* Find VXLAN socket based on network namespace and UDP port */
9c2e24e1 278static struct vxlan_sock *vxlan_find_sock(struct net *net, __be16 port)
553675fb 279{
280 struct vxlan_sock *vs;
281
282 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
283 if (inet_sk(vs->sock->sk)->inet_sport == port)
284 return vs;
285 }
286 return NULL;
d342894c 287}
288
5cfccc5a 289static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, u32 id)
d342894c 290{
291 struct vxlan_dev *vxlan;
d342894c 292
553675fb 293 hlist_for_each_entry_rcu(vxlan, vni_head(vs, id), hlist) {
c7995c43 294 if (vxlan->default_dst.remote_vni == id)
d342894c 295 return vxlan;
296 }
297
298 return NULL;
299}
300
5cfccc5a
PS		 301/* Look up VNI in a per net namespace table */
302static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id, __be16 port)
303{
304 struct vxlan_sock *vs;
305
306 vs = vxlan_find_sock(net, port);
307 if (!vs)
308 return NULL;
309
310 return vxlan_vs_find_vni(vs, id);
311}
312
d342894c 313/* Fill in neighbour message in skbuff. */
314static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
234f5b73
SH		 315 const struct vxlan_fdb *fdb,
316 u32 portid, u32 seq, int type, unsigned int flags,
317 const struct vxlan_rdst *rdst)
d342894c 318{
319 unsigned long now = jiffies;
320 struct nda_cacheinfo ci;
321 struct nlmsghdr *nlh;
322 struct ndmsg *ndm;
e4f67add 323 bool send_ip, send_eth;
d342894c 324
325 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
326 if (nlh == NULL)
327 return -EMSGSIZE;
328
329 ndm = nlmsg_data(nlh);
330 memset(ndm, 0, sizeof(*ndm));
e4f67add
DS		 331
332 send_eth = send_ip = true;
333
334 if (type == RTM_GETNEIGH) {
335 ndm->ndm_family = AF_INET;
e4c7ed41 336 send_ip = !vxlan_addr_any(&rdst->remote_ip);
e4f67add
DS		 337 send_eth = !is_zero_ether_addr(fdb->eth_addr);
338 } else
339 ndm->ndm_family = AF_BRIDGE;
d342894c 340 ndm->ndm_state = fdb->state;
341 ndm->ndm_ifindex = vxlan->dev->ifindex;
ae884082 342 ndm->ndm_flags = fdb->flags;
545469f7 343 ndm->ndm_type = RTN_UNICAST;
d342894c 344
e4f67add 345 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
d342894c 346 goto nla_put_failure;
347
e4c7ed41 348 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
6681712d
DS		 349 goto nla_put_failure;
350
823aa873 351 if (rdst->remote_port && rdst->remote_port != vxlan->dst_port &&
6681712d
DS		 352 nla_put_be16(skb, NDA_PORT, rdst->remote_port))
353 goto nla_put_failure;
c7995c43 354 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
60d9d4c6 355 nla_put_u32(skb, NDA_VNI, rdst->remote_vni))
6681712d
DS		 356 goto nla_put_failure;
357 if (rdst->remote_ifindex &&
358 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
d342894c 359 goto nla_put_failure;
360
361 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
362 ci.ndm_confirmed = 0;
363 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
364 ci.ndm_refcnt = 0;
365
366 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
367 goto nla_put_failure;
368
369 return nlmsg_end(skb, nlh);
370
371nla_put_failure:
372 nlmsg_cancel(skb, nlh);
373 return -EMSGSIZE;
374}
375
376static inline size_t vxlan_nlmsg_size(void)
377{
378 return NLMSG_ALIGN(sizeof(struct ndmsg))
379 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
e4c7ed41 380 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
73cf3317 381 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
6681712d
DS		 382 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
383 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
d342894c 384 + nla_total_size(sizeof(struct nda_cacheinfo));
385}
386
9e4b93f9
ND		 387static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
388 struct vxlan_rdst *rd, int type)
d342894c 389{
390 struct net *net = dev_net(vxlan->dev);
391 struct sk_buff *skb;
392 int err = -ENOBUFS;
393
394 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
395 if (skb == NULL)
396 goto errout;
397
9e4b93f9 398 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
d342894c 399 if (err < 0) {
400 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
401 WARN_ON(err == -EMSGSIZE);
402 kfree_skb(skb);
403 goto errout;
404 }
405
406 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
407 return;
408errout:
409 if (err < 0)
410 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
411}
412
e4c7ed41 413static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
e4f67add
DS		 414{
415 struct vxlan_dev *vxlan = netdev_priv(dev);
bb3fd687
SH		 416 struct vxlan_fdb f = {
417 .state = NUD_STALE,
418 };
419 struct vxlan_rdst remote = {
e4c7ed41 420 .remote_ip = *ipa, /* goes to NDA_DST */
bb3fd687
SH		 421 .remote_vni = VXLAN_N_VID,
422 };
3e61aa8f 423
9e4b93f9 424 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
e4f67add
DS		 425}
426
427static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
428{
bb3fd687
SH		 429 struct vxlan_fdb f = {
430 .state = NUD_STALE,
431 };
9e4b93f9 432 struct vxlan_rdst remote = { };
e4f67add 433
e4f67add
DS		 434 memcpy(f.eth_addr, eth_addr, ETH_ALEN);
435
9e4b93f9 436 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
e4f67add
DS		 437}
438
d342894c 439/* Hash Ethernet address */
440static u32 eth_hash(const unsigned char *addr)
441{
442 u64 value = get_unaligned((u64 *)addr);
443
444 /* only want 6 bytes */
445#ifdef __BIG_ENDIAN
d342894c 446 value >>= 16;
321fb991 447#else
448 value <<= 16;
d342894c 449#endif
450 return hash_64(value, FDB_HASH_BITS);
451}
452
453/* Hash chain to use given mac address */
454static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
455 const u8 *mac)
456{
457 return &vxlan->fdb_head[eth_hash(mac)];
458}
459
460/* Look up Ethernet address in forwarding table */
014be2c8 461static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
d342894c 462 const u8 *mac)
d342894c 463{
464 struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
465 struct vxlan_fdb *f;
d342894c 466
b67bfe0d 467 hlist_for_each_entry_rcu(f, head, hlist) {
7367d0b5 468 if (ether_addr_equal(mac, f->eth_addr))
d342894c 469 return f;
470 }
471
472 return NULL;
473}
474
014be2c8
SS		 475static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
476 const u8 *mac)
477{
478 struct vxlan_fdb *f;
479
480 f = __vxlan_find_mac(vxlan, mac);
481 if (f)
482 f->used = jiffies;
483
484 return f;
485}
486
a5e7c10a
MR		 487/* caller should hold vxlan->hash_lock */
488static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
e4c7ed41 489 union vxlan_addr *ip, __be16 port,
a5e7c10a 490 __u32 vni, __u32 ifindex)
6681712d 491{
3e61aa8f 492 struct vxlan_rdst *rd;
6681712d 493
3e61aa8f 494 list_for_each_entry(rd, &f->remotes, list) {
e4c7ed41 495 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
6681712d
DS		 496 rd->remote_port == port &&
497 rd->remote_vni == vni &&
498 rd->remote_ifindex == ifindex)
a5e7c10a 499 return rd;
6681712d 500 }
3e61aa8f 501
a5e7c10a
MR		 502 return NULL;
503}
504
906dc186
TR		 505/* Replace destination of unicast mac */
506static int vxlan_fdb_replace(struct vxlan_fdb *f,
e4c7ed41 507 union vxlan_addr *ip, __be16 port, __u32 vni, __u32 ifindex)
906dc186
TR		 508{
509 struct vxlan_rdst *rd;
510
511 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
512 if (rd)
513 return 0;
514
515 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
516 if (!rd)
517 return 0;
e4c7ed41 518 rd->remote_ip = *ip;
906dc186
TR		 519 rd->remote_port = port;
520 rd->remote_vni = vni;
521 rd->remote_ifindex = ifindex;
522 return 1;
523}
524
a5e7c10a
MR		 525/* Add/update destinations for multicast */
526static int vxlan_fdb_append(struct vxlan_fdb *f,
9e4b93f9
ND		 527 union vxlan_addr *ip, __be16 port, __u32 vni,
528 __u32 ifindex, struct vxlan_rdst **rdp)
a5e7c10a
MR		 529{
530 struct vxlan_rdst *rd;
531
532 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
533 if (rd)
534 return 0;
535
6681712d
DS		 536 rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
537 if (rd == NULL)
538 return -ENOBUFS;
e4c7ed41 539 rd->remote_ip = *ip;
6681712d
DS		 540 rd->remote_port = port;
541 rd->remote_vni = vni;
542 rd->remote_ifindex = ifindex;
3e61aa8f
SH		 543
544 list_add_tail_rcu(&rd->list, &f->remotes);
545
9e4b93f9 546 *rdp = rd;
6681712d
DS		 547 return 1;
548}
549
dc01e7d3
OG		 550static struct sk_buff **vxlan_gro_receive(struct sk_buff **head, struct sk_buff *skb)
551{
552 struct sk_buff *p, **pp = NULL;
553 struct vxlanhdr *vh, *vh2;
554 struct ethhdr *eh, *eh2;
555 unsigned int hlen, off_vx, off_eth;
556 const struct packet_offload *ptype;
557 __be16 type;
558 int flush = 1;
559
560 off_vx = skb_gro_offset(skb);
561 hlen = off_vx + sizeof(*vh);
562 vh = skb_gro_header_fast(skb, off_vx);
563 if (skb_gro_header_hard(skb, hlen)) {
564 vh = skb_gro_header_slow(skb, hlen, off_vx);
565 if (unlikely(!vh))
566 goto out;
567 }
568 skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
6bae1d4c 569 skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
dc01e7d3
OG		 570
571 off_eth = skb_gro_offset(skb);
572 hlen = off_eth + sizeof(*eh);
573 eh = skb_gro_header_fast(skb, off_eth);
574 if (skb_gro_header_hard(skb, hlen)) {
575 eh = skb_gro_header_slow(skb, hlen, off_eth);
576 if (unlikely(!eh))
577 goto out;
578 }
579
580 flush = 0;
581
582 for (p = *head; p; p = p->next) {
583 if (!NAPI_GRO_CB(p)->same_flow)
584 continue;
585
586 vh2 = (struct vxlanhdr *)(p->data + off_vx);
587 eh2 = (struct ethhdr *)(p->data + off_eth);
588 if (vh->vx_vni != vh2->vx_vni || compare_ether_header(eh, eh2)) {
589 NAPI_GRO_CB(p)->same_flow = 0;
590 continue;
591 }
dc01e7d3
OG		 592 }
593
dc01e7d3
OG		 594 type = eh->h_proto;
595
596 rcu_read_lock();
597 ptype = gro_find_receive_by_type(type);
598 if (ptype == NULL) {
599 flush = 1;
600 goto out_unlock;
601 }
602
603 skb_gro_pull(skb, sizeof(*eh)); /* pull inner eth header */
6bae1d4c 604 skb_gro_postpull_rcsum(skb, eh, sizeof(*eh));
dc01e7d3
OG		 605 pp = ptype->callbacks.gro_receive(head, skb);
606
607out_unlock:
608 rcu_read_unlock();
609out:
610 NAPI_GRO_CB(skb)->flush |= flush;
611
612 return pp;
613}
614
615static int vxlan_gro_complete(struct sk_buff *skb, int nhoff)
616{
617 struct ethhdr *eh;
618 struct packet_offload *ptype;
619 __be16 type;
620 int vxlan_len = sizeof(struct vxlanhdr) + sizeof(struct ethhdr);
621 int err = -ENOSYS;
622
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);
559835ea 1065 rcu_assign_sk_user_data(vs->sock->sk, NULL);
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}
012a5729 1071EXPORT_SYMBOL_GPL(vxlan_sock_release);
d342894c 1072
3fc2de2f 1073/* Callback to update multicast group membership when first VNI on
1074 * multicast asddress is brought up
1075 * Done as workqueue because ip_mc_join_group acquires RTNL.
7c47cedf 1076 */
3fc2de2f 1077static void vxlan_igmp_join(struct work_struct *work)
d342894c 1078{
3fc2de2f 1079 struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_join);
7c47cedf
SH		 1080 struct vxlan_sock *vs = vxlan->vn_sock;
1081 struct sock *sk = vs->sock->sk;
e4c7ed41
CW		 1082 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1083 int ifindex = vxlan->default_dst.remote_ifindex;
d342894c 1084
d342894c 1085 lock_sock(sk);
e4c7ed41
CW		 1086 if (ip->sa.sa_family == AF_INET) {
1087 struct ip_mreqn mreq = {
1088 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1089 .imr_ifindex = ifindex,
1090 };
1091
1092 ip_mc_join_group(sk, &mreq);
1093#if IS_ENABLED(CONFIG_IPV6)
1094 } else {
1095 ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1096 &ip->sin6.sin6_addr);
1097#endif
1098 }
3fc2de2f 1099 release_sock(sk);
1100
012a5729 1101 vxlan_sock_release(vs);
3fc2de2f 1102 dev_put(vxlan->dev);
1103}
1104
1105/* Inverse of vxlan_igmp_join when last VNI is brought down */
1106static void vxlan_igmp_leave(struct work_struct *work)
1107{
1108 struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_leave);
3fc2de2f 1109 struct vxlan_sock *vs = vxlan->vn_sock;
1110 struct sock *sk = vs->sock->sk;
e4c7ed41
CW		 1111 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1112 int ifindex = vxlan->default_dst.remote_ifindex;
3fc2de2f 1113
1114 lock_sock(sk);
e4c7ed41
CW		 1115 if (ip->sa.sa_family == AF_INET) {
1116 struct ip_mreqn mreq = {
1117 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1118 .imr_ifindex = ifindex,
1119 };
1120
1121 ip_mc_leave_group(sk, &mreq);
1122#if IS_ENABLED(CONFIG_IPV6)
1123 } else {
1124 ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1125 &ip->sin6.sin6_addr);
1126#endif
1127 }
1128
d342894c 1129 release_sock(sk);
d342894c 1130
012a5729 1131 vxlan_sock_release(vs);
7c47cedf 1132 dev_put(vxlan->dev);
d342894c 1133}
1134
1135/* Callback from net/ipv4/udp.c to receive packets */
1136static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
1137{
5cfccc5a 1138 struct vxlan_sock *vs;
d342894c 1139 struct vxlanhdr *vxh;
d342894c 1140
d342894c 1141 /* Need Vxlan and inner Ethernet header to be present */
7ce04758 1142 if (!pskb_may_pull(skb, VXLAN_HLEN))
d342894c 1143 goto error;
1144
7ce04758
PS		 1145 /* Return packets with reserved bits set */
1146 vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
d342894c 1147 if (vxh->vx_flags != htonl(VXLAN_FLAGS) ||
1148 (vxh->vx_vni & htonl(0xff))) {
1149 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1150 ntohl(vxh->vx_flags), ntohl(vxh->vx_vni));
1151 goto error;
1152 }
1153
5cfccc5a
PS		 1154 if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB)))
1155 goto drop;
1156
559835ea 1157 vs = rcu_dereference_sk_user_data(sk);
5cfccc5a 1158 if (!vs)
d342894c 1159 goto drop;
d342894c 1160
5cfccc5a
PS		 1161 vs->rcv(vs, skb, vxh->vx_vni);
1162 return 0;
1163
1164drop:
1165 /* Consume bad packet */
1166 kfree_skb(skb);
1167 return 0;
1168
1169error:
1170 /* Return non vxlan pkt */
1171 return 1;
1172}
1173
1174static void vxlan_rcv(struct vxlan_sock *vs,
1175 struct sk_buff *skb, __be32 vx_vni)
1176{
e4c7ed41
CW		 1177 struct iphdr *oip = NULL;
1178 struct ipv6hdr *oip6 = NULL;
5cfccc5a 1179 struct vxlan_dev *vxlan;
8f84985f 1180 struct pcpu_sw_netstats *stats;
e4c7ed41 1181 union vxlan_addr saddr;
5cfccc5a 1182 __u32 vni;
e4c7ed41
CW		 1183 int err = 0;
1184 union vxlan_addr *remote_ip;
5cfccc5a
PS		 1185
1186 vni = ntohl(vx_vni) >> 8;
1187 /* Is this VNI defined? */
1188 vxlan = vxlan_vs_find_vni(vs, vni);
1189 if (!vxlan)
d342894c 1190 goto drop;
d342894c 1191
e4c7ed41 1192 remote_ip = &vxlan->default_dst.remote_ip;
e4f67add 1193 skb_reset_mac_header(skb);
f01ec1c0 1194 skb_scrub_packet(skb, !net_eq(vxlan->net, dev_net(vxlan->dev)));
d342894c 1195 skb->protocol = eth_type_trans(skb, vxlan->dev);
f79b064c 1196 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
d342894c 1197
1198 /* Ignore packet loops (and multicast echo) */
7367d0b5 1199 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
d342894c 1200 goto drop;
1201
7ce04758 1202 /* Re-examine inner Ethernet packet */
e4c7ed41
CW		 1203 if (remote_ip->sa.sa_family == AF_INET) {
1204 oip = ip_hdr(skb);
1205 saddr.sin.sin_addr.s_addr = oip->saddr;
1206 saddr.sa.sa_family = AF_INET;
1207#if IS_ENABLED(CONFIG_IPV6)
1208 } else {
1209 oip6 = ipv6_hdr(skb);
1210 saddr.sin6.sin6_addr = oip6->saddr;
1211 saddr.sa.sa_family = AF_INET6;
1212#endif
1213 }
1214
26a41ae6 1215 if ((vxlan->flags & VXLAN_F_LEARN) &&
e4c7ed41 1216 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
26a41ae6 1217 goto drop;
d342894c 1218
d342894c 1219 skb_reset_network_header(skb);
0afb1666 1220
e4c7ed41
CW		 1221 if (oip6)
1222 err = IP6_ECN_decapsulate(oip6, skb);
1223 if (oip)
1224 err = IP_ECN_decapsulate(oip, skb);
1225
d342894c 1226 if (unlikely(err)) {
e4c7ed41
CW		 1227 if (log_ecn_error) {
1228 if (oip6)
1229 net_info_ratelimited("non-ECT from %pI6\n",
1230 &oip6->saddr);
1231 if (oip)
1232 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1233 &oip->saddr, oip->tos);
1234 }
d342894c 1235 if (err > 1) {
1236 ++vxlan->dev->stats.rx_frame_errors;
1237 ++vxlan->dev->stats.rx_errors;
1238 goto drop;
1239 }
1240 }
1241
e8171045 1242 stats = this_cpu_ptr(vxlan->dev->tstats);
d342894c 1243 u64_stats_update_begin(&stats->syncp);
1244 stats->rx_packets++;
1245 stats->rx_bytes += skb->len;
1246 u64_stats_update_end(&stats->syncp);
1247
1248 netif_rx(skb);
1249
5cfccc5a 1250 return;
d342894c 1251drop:
1252 /* Consume bad packet */
1253 kfree_skb(skb);
d342894c 1254}
1255
e4f67add
DS		 1256static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1257{
1258 struct vxlan_dev *vxlan = netdev_priv(dev);
1259 struct arphdr *parp;
1260 u8 *arpptr, *sha;
1261 __be32 sip, tip;
1262 struct neighbour *n;
1263
1264 if (dev->flags & IFF_NOARP)
1265 goto out;
1266
1267 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1268 dev->stats.tx_dropped++;
1269 goto out;
1270 }
1271 parp = arp_hdr(skb);
1272
1273 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1274 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1275 parp->ar_pro != htons(ETH_P_IP) ||
1276 parp->ar_op != htons(ARPOP_REQUEST) ||
1277 parp->ar_hln != dev->addr_len ||
1278 parp->ar_pln != 4)
1279 goto out;
1280 arpptr = (u8 *)parp + sizeof(struct arphdr);
1281 sha = arpptr;
1282 arpptr += dev->addr_len; /* sha */
1283 memcpy(&sip, arpptr, sizeof(sip));
1284 arpptr += sizeof(sip);
1285 arpptr += dev->addr_len; /* tha */
1286 memcpy(&tip, arpptr, sizeof(tip));
1287
1288 if (ipv4_is_loopback(tip) ||
1289 ipv4_is_multicast(tip))
1290 goto out;
1291
1292 n = neigh_lookup(&arp_tbl, &tip, dev);
1293
1294 if (n) {
e4f67add
DS		 1295 struct vxlan_fdb *f;
1296 struct sk_buff *reply;
1297
1298 if (!(n->nud_state & NUD_CONNECTED)) {
1299 neigh_release(n);
1300 goto out;
1301 }
1302
1303 f = vxlan_find_mac(vxlan, n->ha);
e4c7ed41 1304 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
e4f67add
DS		 1305 /* bridge-local neighbor */
1306 neigh_release(n);
1307 goto out;
1308 }
1309
1310 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1311 n->ha, sha);
1312
1313 neigh_release(n);
1314
7346135d
DS		 1315 if (reply == NULL)
1316 goto out;
1317
e4f67add
DS		 1318 skb_reset_mac_header(reply);
1319 __skb_pull(reply, skb_network_offset(reply));
1320 reply->ip_summed = CHECKSUM_UNNECESSARY;
1321 reply->pkt_type = PACKET_HOST;
1322
1323 if (netif_rx_ni(reply) == NET_RX_DROP)
1324 dev->stats.rx_dropped++;
e4c7ed41
CW		 1325 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1326 union vxlan_addr ipa = {
1327 .sin.sin_addr.s_addr = tip,
a45e92a5 1328 .sin.sin_family = AF_INET,
e4c7ed41
CW		 1329 };
1330
1331 vxlan_ip_miss(dev, &ipa);
1332 }
e4f67add
DS		 1333out:
1334 consume_skb(skb);
1335 return NETDEV_TX_OK;
1336}
1337
f564f45c 1338#if IS_ENABLED(CONFIG_IPV6)
4b29dba9
DS		 1339
1340static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1341 struct neighbour *n, bool isrouter)
1342{
1343 struct net_device *dev = request->dev;
1344 struct sk_buff *reply;
1345 struct nd_msg *ns, *na;
1346 struct ipv6hdr *pip6;
1347 u8 *daddr;
1348 int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1349 int ns_olen;
1350 int i, len;
1351
1352 if (dev == NULL)
1353 return NULL;
1354
1355 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1356 sizeof(*na) + na_olen + dev->needed_tailroom;
1357 reply = alloc_skb(len, GFP_ATOMIC);
1358 if (reply == NULL)
1359 return NULL;
1360
1361 reply->protocol = htons(ETH_P_IPV6);
1362 reply->dev = dev;
1363 skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1364 skb_push(reply, sizeof(struct ethhdr));
1365 skb_set_mac_header(reply, 0);
1366
1367 ns = (struct nd_msg *)skb_transport_header(request);
1368
1369 daddr = eth_hdr(request)->h_source;
1370 ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
1371 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1372 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1373 daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1374 break;
1375 }
1376 }
1377
1378 /* Ethernet header */
1379 ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1380 ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1381 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1382 reply->protocol = htons(ETH_P_IPV6);
1383
1384 skb_pull(reply, sizeof(struct ethhdr));
1385 skb_set_network_header(reply, 0);
1386 skb_put(reply, sizeof(struct ipv6hdr));
1387
1388 /* IPv6 header */
1389
1390 pip6 = ipv6_hdr(reply);
1391 memset(pip6, 0, sizeof(struct ipv6hdr));
1392 pip6->version = 6;
1393 pip6->priority = ipv6_hdr(request)->priority;
1394 pip6->nexthdr = IPPROTO_ICMPV6;
1395 pip6->hop_limit = 255;
1396 pip6->daddr = ipv6_hdr(request)->saddr;
1397 pip6->saddr = *(struct in6_addr *)n->primary_key;
1398
1399 skb_pull(reply, sizeof(struct ipv6hdr));
1400 skb_set_transport_header(reply, 0);
1401
1402 na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1403
1404 /* Neighbor Advertisement */
1405 memset(na, 0, sizeof(*na)+na_olen);
1406 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1407 na->icmph.icmp6_router = isrouter;
1408 na->icmph.icmp6_override = 1;
1409 na->icmph.icmp6_solicited = 1;
1410 na->target = ns->target;
1411 ether_addr_copy(&na->opt[2], n->ha);
1412 na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1413 na->opt[1] = na_olen >> 3;
1414
1415 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1416 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1417 csum_partial(na, sizeof(*na)+na_olen, 0));
1418
1419 pip6->payload_len = htons(sizeof(*na)+na_olen);
1420
1421 skb_push(reply, sizeof(struct ipv6hdr));
1422
1423 reply->ip_summed = CHECKSUM_UNNECESSARY;
1424
1425 return reply;
1426}
1427
f564f45c
CW		 1428static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1429{
1430 struct vxlan_dev *vxlan = netdev_priv(dev);
4b29dba9 1431 struct nd_msg *msg;
f564f45c
CW		 1432 const struct ipv6hdr *iphdr;
1433 const struct in6_addr *saddr, *daddr;
4b29dba9
DS		 1434 struct neighbour *n;
1435 struct inet6_dev *in6_dev;
f564f45c
CW		 1436
1437 in6_dev = __in6_dev_get(dev);
1438 if (!in6_dev)
1439 goto out;
1440
1441 if (!pskb_may_pull(skb, skb->len))
1442 goto out;
1443
1444 iphdr = ipv6_hdr(skb);
1445 saddr = &iphdr->saddr;
1446 daddr = &iphdr->daddr;
1447
f564f45c
CW		 1448 msg = (struct nd_msg *)skb_transport_header(skb);
1449 if (msg->icmph.icmp6_code != 0 ||
1450 msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1451 goto out;
1452
4b29dba9
DS		 1453 if (ipv6_addr_loopback(daddr) ||
1454 ipv6_addr_is_multicast(&msg->target))
1455 goto out;
1456
1457 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
f564f45c
CW		 1458
1459 if (n) {
1460 struct vxlan_fdb *f;
4b29dba9 1461 struct sk_buff *reply;
f564f45c
CW		 1462
1463 if (!(n->nud_state & NUD_CONNECTED)) {
1464 neigh_release(n);
1465 goto out;
1466 }
1467
1468 f = vxlan_find_mac(vxlan, n->ha);
1469 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1470 /* bridge-local neighbor */
1471 neigh_release(n);
1472 goto out;
1473 }
1474
4b29dba9
DS		 1475 reply = vxlan_na_create(skb, n,
1476 !!(f ? f->flags & NTF_ROUTER : 0));
1477
f564f45c 1478 neigh_release(n);
4b29dba9
DS		 1479
1480 if (reply == NULL)
1481 goto out;
1482
1483 if (netif_rx_ni(reply) == NET_RX_DROP)
1484 dev->stats.rx_dropped++;
1485
f564f45c 1486 } else if (vxlan->flags & VXLAN_F_L3MISS) {
4b29dba9
DS		 1487 union vxlan_addr ipa = {
1488 .sin6.sin6_addr = msg->target,
a45e92a5 1489 .sin6.sin6_family = AF_INET6,
4b29dba9
DS		 1490 };
1491
f564f45c
CW		 1492 vxlan_ip_miss(dev, &ipa);
1493 }
1494
1495out:
1496 consume_skb(skb);
1497 return NETDEV_TX_OK;
1498}
1499#endif
1500
e4f67add
DS		 1501static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1502{
1503 struct vxlan_dev *vxlan = netdev_priv(dev);
1504 struct neighbour *n;
e4f67add
DS		 1505
1506 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1507 return false;
1508
1509 n = NULL;
1510 switch (ntohs(eth_hdr(skb)->h_proto)) {
1511 case ETH_P_IP:
e15a00aa
CW		 1512 {
1513 struct iphdr *pip;
1514
e4f67add
DS		 1515 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1516 return false;
1517 pip = ip_hdr(skb);
1518 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
e4c7ed41
CW		 1519 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1520 union vxlan_addr ipa = {
1521 .sin.sin_addr.s_addr = pip->daddr,
a45e92a5 1522 .sin.sin_family = AF_INET,
e4c7ed41
CW		 1523 };
1524
1525 vxlan_ip_miss(dev, &ipa);
1526 return false;
1527 }
1528
e4f67add 1529 break;
e15a00aa
CW		 1530 }
1531#if IS_ENABLED(CONFIG_IPV6)
1532 case ETH_P_IPV6:
1533 {
1534 struct ipv6hdr *pip6;
1535
1536 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1537 return false;
1538 pip6 = ipv6_hdr(skb);
1539 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1540 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1541 union vxlan_addr ipa = {
1542 .sin6.sin6_addr = pip6->daddr,
a45e92a5 1543 .sin6.sin6_family = AF_INET6,
e15a00aa
CW		 1544 };
1545
1546 vxlan_ip_miss(dev, &ipa);
1547 return false;
1548 }
1549
1550 break;
1551 }
1552#endif
e4f67add
DS		 1553 default:
1554 return false;
1555 }
1556
1557 if (n) {
1558 bool diff;
1559
7367d0b5 1560 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
e4f67add
DS		 1561 if (diff) {
1562 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1563 dev->addr_len);
1564 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1565 }
1566 neigh_release(n);
1567 return diff;
e4c7ed41
CW		 1568 }
1569
e4f67add
DS		 1570 return false;
1571}
1572
359a0ea9
TH		 1573static inline struct sk_buff *vxlan_handle_offloads(struct sk_buff *skb,
1574 bool udp_csum)
05c0db08 1575{
359a0ea9
TH		 1576 int type = udp_csum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1577 return iptunnel_handle_offloads(skb, udp_csum, type);
05c0db08
PS		 1578}
1579
e4c7ed41 1580#if IS_ENABLED(CONFIG_IPV6)
11796187 1581static int vxlan6_xmit_skb(struct vxlan_sock *vs,
e4c7ed41
CW		 1582 struct dst_entry *dst, struct sk_buff *skb,
1583 struct net_device *dev, struct in6_addr *saddr,
1584 struct in6_addr *daddr, __u8 prio, __u8 ttl,
f01ec1c0
ND		 1585 __be16 src_port, __be16 dst_port, __be32 vni,
1586 bool xnet)
e4c7ed41
CW		 1587{
1588 struct ipv6hdr *ip6h;
1589 struct vxlanhdr *vxh;
1590 struct udphdr *uh;
1591 int min_headroom;
1592 int err;
1593
359a0ea9
TH		 1594 skb = vxlan_handle_offloads(skb, !udp_get_no_check6_tx(vs->sock->sk));
1595 if (IS_ERR(skb))
1596 return -EINVAL;
e4c7ed41 1597
f01ec1c0 1598 skb_scrub_packet(skb, xnet);
963a88b3 1599
e4c7ed41
CW		 1600 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1601 + VXLAN_HLEN + sizeof(struct ipv6hdr)
1602 + (vlan_tx_tag_present(skb) ? VLAN_HLEN : 0);
1603
1604 /* Need space for new headers (invalidates iph ptr) */
1605 err = skb_cow_head(skb, min_headroom);
1606 if (unlikely(err))
1607 return err;
1608
1609 if (vlan_tx_tag_present(skb)) {
1610 if (WARN_ON(!__vlan_put_tag(skb,
1611 skb->vlan_proto,
1612 vlan_tx_tag_get(skb))))
1613 return -ENOMEM;
1614
1615 skb->vlan_tci = 0;
1616 }
1617
1618 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1619 vxh->vx_flags = htonl(VXLAN_FLAGS);
1620 vxh->vx_vni = vni;
1621
1622 __skb_push(skb, sizeof(*uh));
1623 skb_reset_transport_header(skb);
1624 uh = udp_hdr(skb);
1625
1626 uh->dest = dst_port;
1627 uh->source = src_port;
1628
1629 uh->len = htons(skb->len);
e4c7ed41
CW		 1630
1631 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1632 IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED |
1633 IPSKB_REROUTED);
e4c7ed41
CW		 1634 skb_dst_set(skb, dst);
1635
359a0ea9
TH		 1636 udp6_set_csum(udp_get_no_check6_tx(vs->sock->sk), skb,
1637 saddr, daddr, skb->len);
e4c7ed41
CW		 1638
1639 __skb_push(skb, sizeof(*ip6h));
1640 skb_reset_network_header(skb);
1641 ip6h = ipv6_hdr(skb);
1642 ip6h->version = 6;
1643 ip6h->priority = prio;
1644 ip6h->flow_lbl[0] = 0;
1645 ip6h->flow_lbl[1] = 0;
1646 ip6h->flow_lbl[2] = 0;
1647 ip6h->payload_len = htons(skb->len);
1648 ip6h->nexthdr = IPPROTO_UDP;
1649 ip6h->hop_limit = ttl;
1650 ip6h->daddr = *daddr;
1651 ip6h->saddr = *saddr;
1652
e4c7ed41
CW		 1653 ip6tunnel_xmit(skb, dev);
1654 return 0;
1655}
1656#endif
1657
11796187 1658int vxlan_xmit_skb(struct vxlan_sock *vs,
49560532
PS		 1659 struct rtable *rt, struct sk_buff *skb,
1660 __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
f01ec1c0 1661 __be16 src_port, __be16 dst_port, __be32 vni, bool xnet)
49560532
PS		 1662{
1663 struct vxlanhdr *vxh;
1664 struct udphdr *uh;
649c5b8b 1665 int min_headroom;
49560532
PS		 1666 int err;
1667
359a0ea9
TH		 1668 skb = vxlan_handle_offloads(skb, !vs->sock->sk->sk_no_check_tx);
1669 if (IS_ERR(skb))
1670 return -EINVAL;
49560532 1671
649c5b8b 1672 min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
1eaa8178
PS		 1673 + VXLAN_HLEN + sizeof(struct iphdr)
1674 + (vlan_tx_tag_present(skb) ? VLAN_HLEN : 0);
649c5b8b
PS		 1675
1676 /* Need space for new headers (invalidates iph ptr) */
1677 err = skb_cow_head(skb, min_headroom);
1678 if (unlikely(err))
1679 return err;
1680
1eaa8178
PS		 1681 if (vlan_tx_tag_present(skb)) {
1682 if (WARN_ON(!__vlan_put_tag(skb,
1683 skb->vlan_proto,
1684 vlan_tx_tag_get(skb))))
1685 return -ENOMEM;
1686
1687 skb->vlan_tci = 0;
1688 }
1689
49560532
PS		 1690 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1691 vxh->vx_flags = htonl(VXLAN_FLAGS);
1692 vxh->vx_vni = vni;
1693
1694 __skb_push(skb, sizeof(*uh));
1695 skb_reset_transport_header(skb);
1696 uh = udp_hdr(skb);
1697
1698 uh->dest = dst_port;
1699 uh->source = src_port;
1700
1701 uh->len = htons(skb->len);
49560532 1702
359a0ea9
TH		 1703 udp_set_csum(vs->sock->sk->sk_no_check_tx, skb,
1704 src, dst, skb->len);
49560532 1705
aad88724 1706 return iptunnel_xmit(vs->sock->sk, rt, skb, src, dst, IPPROTO_UDP,
f01ec1c0 1707 tos, ttl, df, xnet);
49560532
PS		 1708}
1709EXPORT_SYMBOL_GPL(vxlan_xmit_skb);
1710
9dcc71e1
SS		 1711/* Bypass encapsulation if the destination is local */
1712static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1713 struct vxlan_dev *dst_vxlan)
1714{
8f84985f 1715 struct pcpu_sw_netstats *tx_stats, *rx_stats;
e4c7ed41
CW		 1716 union vxlan_addr loopback;
1717 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
9dcc71e1 1718
8f84985f
LR		 1719 tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1720 rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
9dcc71e1
SS		 1721 skb->pkt_type = PACKET_HOST;
1722 skb->encapsulation = 0;
1723 skb->dev = dst_vxlan->dev;
1724 __skb_pull(skb, skb_network_offset(skb));
1725
e4c7ed41
CW		 1726 if (remote_ip->sa.sa_family == AF_INET) {
1727 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1728 loopback.sa.sa_family = AF_INET;
1729#if IS_ENABLED(CONFIG_IPV6)
1730 } else {
1731 loopback.sin6.sin6_addr = in6addr_loopback;
1732 loopback.sa.sa_family = AF_INET6;
1733#endif
1734 }
1735
9dcc71e1 1736 if (dst_vxlan->flags & VXLAN_F_LEARN)
e4c7ed41 1737 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
9dcc71e1
SS		 1738
1739 u64_stats_update_begin(&tx_stats->syncp);
1740 tx_stats->tx_packets++;
1741 tx_stats->tx_bytes += skb->len;
1742 u64_stats_update_end(&tx_stats->syncp);
1743
1744 if (netif_rx(skb) == NET_RX_SUCCESS) {
1745 u64_stats_update_begin(&rx_stats->syncp);
1746 rx_stats->rx_packets++;
1747 rx_stats->rx_bytes += skb->len;
1748 u64_stats_update_end(&rx_stats->syncp);
1749 } else {
1750 skb->dev->stats.rx_dropped++;
1751 }
1752}
1753
4ad16930
SH		 1754static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1755 struct vxlan_rdst *rdst, bool did_rsc)
d342894c 1756{
1757 struct vxlan_dev *vxlan = netdev_priv(dev);
e4c7ed41 1758 struct rtable *rt = NULL;
d342894c 1759 const struct iphdr *old_iph;
d342894c 1760 struct flowi4 fl4;
e4c7ed41
CW		 1761 union vxlan_addr *dst;
1762 __be16 src_port = 0, dst_port;
234f5b73 1763 u32 vni;
d342894c 1764 __be16 df = 0;
1765 __u8 tos, ttl;
0e6fbc5b 1766 int err;
d342894c 1767
823aa873 1768 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->dst_port;
6681712d 1769 vni = rdst->remote_vni;
e4c7ed41 1770 dst = &rdst->remote_ip;
e4f67add 1771
e4c7ed41 1772 if (vxlan_addr_any(dst)) {
e4f67add 1773 if (did_rsc) {
e4f67add 1774 /* short-circuited back to local bridge */
9dcc71e1 1775 vxlan_encap_bypass(skb, vxlan, vxlan);
4ad16930 1776 return;
e4f67add 1777 }
ef59febe 1778 goto drop;
e4f67add 1779 }
ef59febe 1780
d342894c 1781 old_iph = ip_hdr(skb);
1782
d342894c 1783 ttl = vxlan->ttl;
e4c7ed41 1784 if (!ttl && vxlan_addr_multicast(dst))
d342894c 1785 ttl = 1;
1786
1787 tos = vxlan->tos;
1788 if (tos == 1)
206aaafc 1789 tos = ip_tunnel_get_dsfield(old_iph, skb);
d342894c 1790
535fb8d0
TH		 1791 src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->port_min,
1792 vxlan->port_max, true);
d342894c 1793
e4c7ed41
CW		 1794 if (dst->sa.sa_family == AF_INET) {
1795 memset(&fl4, 0, sizeof(fl4));
1796 fl4.flowi4_oif = rdst->remote_ifindex;
1797 fl4.flowi4_tos = RT_TOS(tos);
1798 fl4.daddr = dst->sin.sin_addr.s_addr;
1799 fl4.saddr = vxlan->saddr.sin.sin_addr.s_addr;
1800
f01ec1c0 1801 rt = ip_route_output_key(vxlan->net, &fl4);
e4c7ed41
CW		 1802 if (IS_ERR(rt)) {
1803 netdev_dbg(dev, "no route to %pI4\n",
1804 &dst->sin.sin_addr.s_addr);
1805 dev->stats.tx_carrier_errors++;
1806 goto tx_error;
1807 }
d342894c 1808
e4c7ed41
CW		 1809 if (rt->dst.dev == dev) {
1810 netdev_dbg(dev, "circular route to %pI4\n",
1811 &dst->sin.sin_addr.s_addr);
1812 dev->stats.collisions++;
fffc15a5 1813 goto rt_tx_error;
e4c7ed41
CW		 1814 }
1815
1816 /* Bypass encapsulation if the destination is local */
1817 if (rt->rt_flags & RTCF_LOCAL &&
1818 !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1819 struct vxlan_dev *dst_vxlan;
1820
1821 ip_rt_put(rt);
f01ec1c0 1822 dst_vxlan = vxlan_find_vni(vxlan->net, vni, dst_port);
e4c7ed41
CW		 1823 if (!dst_vxlan)
1824 goto tx_error;
1825 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1826 return;
1827 }
1828
1829 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
1830 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
d342894c 1831
11796187 1832 err = vxlan_xmit_skb(vxlan->vn_sock, rt, skb,
e4c7ed41
CW		 1833 fl4.saddr, dst->sin.sin_addr.s_addr,
1834 tos, ttl, df, src_port, dst_port,
f01ec1c0
ND		 1835 htonl(vni << 8),
1836 !net_eq(vxlan->net, dev_net(vxlan->dev)));
9dcc71e1 1837
e4c7ed41
CW		 1838 if (err < 0)
1839 goto rt_tx_error;
1840 iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
1841#if IS_ENABLED(CONFIG_IPV6)
1842 } else {
1843 struct sock *sk = vxlan->vn_sock->sock->sk;
1844 struct dst_entry *ndst;
1845 struct flowi6 fl6;
1846 u32 flags;
1847
1848 memset(&fl6, 0, sizeof(fl6));
1849 fl6.flowi6_oif = rdst->remote_ifindex;
1850 fl6.daddr = dst->sin6.sin6_addr;
1851 fl6.saddr = vxlan->saddr.sin6.sin6_addr;
8c1bb79f 1852 fl6.flowi6_proto = IPPROTO_UDP;
e4c7ed41
CW		 1853
1854 if (ipv6_stub->ipv6_dst_lookup(sk, &ndst, &fl6)) {
1855 netdev_dbg(dev, "no route to %pI6\n",
1856 &dst->sin6.sin6_addr);
1857 dev->stats.tx_carrier_errors++;
9dcc71e1 1858 goto tx_error;
e4c7ed41 1859 }
d342894c 1860
e4c7ed41
CW		 1861 if (ndst->dev == dev) {
1862 netdev_dbg(dev, "circular route to %pI6\n",
1863 &dst->sin6.sin6_addr);
1864 dst_release(ndst);
1865 dev->stats.collisions++;
1866 goto tx_error;
1867 }
0e6fbc5b 1868
e4c7ed41
CW		 1869 /* Bypass encapsulation if the destination is local */
1870 flags = ((struct rt6_info *)ndst)->rt6i_flags;
1871 if (flags & RTF_LOCAL &&
1872 !(flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1873 struct vxlan_dev *dst_vxlan;
1874
1875 dst_release(ndst);
f01ec1c0 1876 dst_vxlan = vxlan_find_vni(vxlan->net, vni, dst_port);
e4c7ed41
CW		 1877 if (!dst_vxlan)
1878 goto tx_error;
1879 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1880 return;
1881 }
49560532 1882
e4c7ed41
CW		 1883 ttl = ttl ? : ip6_dst_hoplimit(ndst);
1884
11796187 1885 err = vxlan6_xmit_skb(vxlan->vn_sock, ndst, skb,
e4c7ed41 1886 dev, &fl6.saddr, &fl6.daddr, 0, ttl,
f01ec1c0
ND		 1887 src_port, dst_port, htonl(vni << 8),
1888 !net_eq(vxlan->net, dev_net(vxlan->dev)));
e4c7ed41
CW		 1889#endif
1890 }
0e6fbc5b 1891
4ad16930 1892 return;
d342894c 1893
1894drop:
1895 dev->stats.tx_dropped++;
1896 goto tx_free;
1897
49560532
PS		 1898rt_tx_error:
1899 ip_rt_put(rt);
d342894c 1900tx_error:
1901 dev->stats.tx_errors++;
1902tx_free:
1903 dev_kfree_skb(skb);
d342894c 1904}
1905
6681712d
DS		 1906/* Transmit local packets over Vxlan
1907 *
1908 * Outer IP header inherits ECN and DF from inner header.
1909 * Outer UDP destination is the VXLAN assigned port.
1910 * source port is based on hash of flow
1911 */
1912static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
1913{
1914 struct vxlan_dev *vxlan = netdev_priv(dev);
1915 struct ethhdr *eth;
1916 bool did_rsc = false;
8f646c92 1917 struct vxlan_rdst *rdst, *fdst = NULL;
6681712d 1918 struct vxlan_fdb *f;
6681712d
DS		 1919
1920 skb_reset_mac_header(skb);
1921 eth = eth_hdr(skb);
1922
f564f45c
CW		 1923 if ((vxlan->flags & VXLAN_F_PROXY)) {
1924 if (ntohs(eth->h_proto) == ETH_P_ARP)
1925 return arp_reduce(dev, skb);
1926#if IS_ENABLED(CONFIG_IPV6)
1927 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
1928 skb->len >= sizeof(struct ipv6hdr) + sizeof(struct nd_msg) &&
1929 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
1930 struct nd_msg *msg;
1931
1932 msg = (struct nd_msg *)skb_transport_header(skb);
1933 if (msg->icmph.icmp6_code == 0 &&
1934 msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
1935 return neigh_reduce(dev, skb);
1936 }
1937#endif
1938 }
6681712d
DS		 1939
1940 f = vxlan_find_mac(vxlan, eth->h_dest);
ae884082
DS		 1941 did_rsc = false;
1942
1943 if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
e15a00aa
CW		 1944 (ntohs(eth->h_proto) == ETH_P_IP ||
1945 ntohs(eth->h_proto) == ETH_P_IPV6)) {
ae884082
DS		 1946 did_rsc = route_shortcircuit(dev, skb);
1947 if (did_rsc)
1948 f = vxlan_find_mac(vxlan, eth->h_dest);
1949 }
1950
6681712d 1951 if (f == NULL) {
afbd8bae
MR		 1952 f = vxlan_find_mac(vxlan, all_zeros_mac);
1953 if (f == NULL) {
1954 if ((vxlan->flags & VXLAN_F_L2MISS) &&
1955 !is_multicast_ether_addr(eth->h_dest))
1956 vxlan_fdb_miss(vxlan, eth->h_dest);
1957
1958 dev->stats.tx_dropped++;
8f646c92 1959 kfree_skb(skb);
afbd8bae
MR		 1960 return NETDEV_TX_OK;
1961 }
1962 }
6681712d 1963
afbd8bae
MR		 1964 list_for_each_entry_rcu(rdst, &f->remotes, list) {
1965 struct sk_buff *skb1;
6681712d 1966
8f646c92
ED		 1967 if (!fdst) {
1968 fdst = rdst;
1969 continue;
1970 }
afbd8bae
MR		 1971 skb1 = skb_clone(skb, GFP_ATOMIC);
1972 if (skb1)
1973 vxlan_xmit_one(skb1, dev, rdst, did_rsc);
6681712d
DS		 1974 }
1975
8f646c92
ED		 1976 if (fdst)
1977 vxlan_xmit_one(skb, dev, fdst, did_rsc);
1978 else
1979 kfree_skb(skb);
4ad16930 1980 return NETDEV_TX_OK;
6681712d
DS		 1981}
1982
d342894c 1983/* Walk the forwarding table and purge stale entries */
1984static void vxlan_cleanup(unsigned long arg)
1985{
1986 struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
1987 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
1988 unsigned int h;
1989
1990 if (!netif_running(vxlan->dev))
1991 return;
1992
1993 spin_lock_bh(&vxlan->hash_lock);
1994 for (h = 0; h < FDB_HASH_SIZE; ++h) {
1995 struct hlist_node *p, *n;
1996 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
1997 struct vxlan_fdb *f
1998 = container_of(p, struct vxlan_fdb, hlist);
1999 unsigned long timeout;
2000
3c172868 2001 if (f->state & NUD_PERMANENT)
d342894c 2002 continue;
2003
2004 timeout = f->used + vxlan->age_interval * HZ;
2005 if (time_before_eq(timeout, jiffies)) {
2006 netdev_dbg(vxlan->dev,
2007 "garbage collect %pM\n",
2008 f->eth_addr);
2009 f->state = NUD_STALE;
2010 vxlan_fdb_destroy(vxlan, f);
2011 } else if (time_before(timeout, next_timer))
2012 next_timer = timeout;
2013 }
2014 }
2015 spin_unlock_bh(&vxlan->hash_lock);
2016
2017 mod_timer(&vxlan->age_timer, next_timer);
2018}
2019
9c2e24e1
PS		 2020static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
2021{
2022 __u32 vni = vxlan->default_dst.remote_vni;
2023
2024 vxlan->vn_sock = vs;
2025 hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
2026}
2027
d342894c 2028/* Setup stats when device is created */
2029static int vxlan_init(struct net_device *dev)
2030{
1c51a915 2031 struct vxlan_dev *vxlan = netdev_priv(dev);
f01ec1c0 2032 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
1c51a915 2033 struct vxlan_sock *vs;
1c51a915 2034
1c213bd2 2035 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
e8171045 2036 if (!dev->tstats)
d342894c 2037 return -ENOMEM;
2038
1c51a915 2039 spin_lock(&vn->sock_lock);
f01ec1c0 2040 vs = vxlan_find_sock(vxlan->net, vxlan->dst_port);
1c51a915
SH		 2041 if (vs) {
2042 /* If we have a socket with same port already, reuse it */
2043 atomic_inc(&vs->refcnt);
9c2e24e1 2044 vxlan_vs_add_dev(vs, vxlan);
1c51a915
SH		 2045 } else {
2046 /* otherwise make new socket outside of RTNL */
2047 dev_hold(dev);
2048 queue_work(vxlan_wq, &vxlan->sock_work);
2049 }
2050 spin_unlock(&vn->sock_lock);
2051
d342894c 2052 return 0;
2053}
2054
ba609e9b 2055static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
afbd8bae
MR		 2056{
2057 struct vxlan_fdb *f;
2058
2059 spin_lock_bh(&vxlan->hash_lock);
2060 f = __vxlan_find_mac(vxlan, all_zeros_mac);
2061 if (f)
2062 vxlan_fdb_destroy(vxlan, f);
2063 spin_unlock_bh(&vxlan->hash_lock);
2064}
2065
ebf4063e
SH		 2066static void vxlan_uninit(struct net_device *dev)
2067{
2068 struct vxlan_dev *vxlan = netdev_priv(dev);
ebf4063e
SH		 2069 struct vxlan_sock *vs = vxlan->vn_sock;
2070
ba609e9b 2071 vxlan_fdb_delete_default(vxlan);
afbd8bae 2072
ebf4063e 2073 if (vs)
012a5729 2074 vxlan_sock_release(vs);
ebf4063e
SH		 2075 free_percpu(dev->tstats);
2076}
2077
d342894c 2078/* Start ageing timer and join group when device is brought up */
2079static int vxlan_open(struct net_device *dev)
2080{
2081 struct vxlan_dev *vxlan = netdev_priv(dev);
1c51a915
SH		 2082 struct vxlan_sock *vs = vxlan->vn_sock;
2083
2084 /* socket hasn't been created */
2085 if (!vs)
2086 return -ENOTCONN;
d342894c 2087
79d4a94f 2088 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
1c51a915 2089 vxlan_sock_hold(vs);
7c47cedf 2090 dev_hold(dev);
3fc2de2f 2091 queue_work(vxlan_wq, &vxlan->igmp_join);
d342894c 2092 }
2093
2094 if (vxlan->age_interval)
2095 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2096
2097 return 0;
2098}
2099
2100/* Purge the forwarding table */
2101static void vxlan_flush(struct vxlan_dev *vxlan)
2102{
31fec5aa 2103 unsigned int h;
d342894c 2104
2105 spin_lock_bh(&vxlan->hash_lock);
2106 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2107 struct hlist_node *p, *n;
2108 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2109 struct vxlan_fdb *f
2110 = container_of(p, struct vxlan_fdb, hlist);
afbd8bae
MR		 2111 /* the all_zeros_mac entry is deleted at vxlan_uninit */
2112 if (!is_zero_ether_addr(f->eth_addr))
2113 vxlan_fdb_destroy(vxlan, f);
d342894c 2114 }
2115 }
2116 spin_unlock_bh(&vxlan->hash_lock);
2117}
2118
2119/* Cleanup timer and forwarding table on shutdown */
2120static int vxlan_stop(struct net_device *dev)
2121{
2122 struct vxlan_dev *vxlan = netdev_priv(dev);
f01ec1c0 2123 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
1c51a915 2124 struct vxlan_sock *vs = vxlan->vn_sock;
d342894c 2125
e4c7ed41 2126 if (vs && vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
95ab0991 2127 !vxlan_group_used(vn, vxlan)) {
1c51a915 2128 vxlan_sock_hold(vs);
7c47cedf 2129 dev_hold(dev);
3fc2de2f 2130 queue_work(vxlan_wq, &vxlan->igmp_leave);
7c47cedf 2131 }
d342894c 2132
2133 del_timer_sync(&vxlan->age_timer);
2134
2135 vxlan_flush(vxlan);
2136
2137 return 0;
2138}
2139
d342894c 2140/* Stub, nothing needs to be done. */
2141static void vxlan_set_multicast_list(struct net_device *dev)
2142{
2143}
2144
345010b5
DB		 2145static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2146{
2147 struct vxlan_dev *vxlan = netdev_priv(dev);
2148 struct vxlan_rdst *dst = &vxlan->default_dst;
2149 struct net_device *lowerdev;
2150 int max_mtu;
2151
f01ec1c0 2152 lowerdev = __dev_get_by_index(vxlan->net, dst->remote_ifindex);
345010b5
DB		 2153 if (lowerdev == NULL)
2154 return eth_change_mtu(dev, new_mtu);
2155
2156 if (dst->remote_ip.sa.sa_family == AF_INET6)
2157 max_mtu = lowerdev->mtu - VXLAN6_HEADROOM;
2158 else
2159 max_mtu = lowerdev->mtu - VXLAN_HEADROOM;
2160
2161 if (new_mtu < 68 || new_mtu > max_mtu)
2162 return -EINVAL;
2163
2164 dev->mtu = new_mtu;
2165 return 0;
2166}
2167
d342894c 2168static const struct net_device_ops vxlan_netdev_ops = {
2169 .ndo_init = vxlan_init,
ebf4063e 2170 .ndo_uninit = vxlan_uninit,
d342894c 2171 .ndo_open = vxlan_open,
2172 .ndo_stop = vxlan_stop,
2173 .ndo_start_xmit = vxlan_xmit,
e8171045 2174 .ndo_get_stats64 = ip_tunnel_get_stats64,
d342894c 2175 .ndo_set_rx_mode = vxlan_set_multicast_list,
345010b5 2176 .ndo_change_mtu = vxlan_change_mtu,
d342894c 2177 .ndo_validate_addr = eth_validate_addr,
2178 .ndo_set_mac_address = eth_mac_addr,
2179 .ndo_fdb_add = vxlan_fdb_add,
2180 .ndo_fdb_del = vxlan_fdb_delete,
2181 .ndo_fdb_dump = vxlan_fdb_dump,
2182};
2183
2184/* Info for udev, that this is a virtual tunnel endpoint */
2185static struct device_type vxlan_type = {
2186 .name = "vxlan",
2187};
2188
53cf5275 2189/* Calls the ndo_add_vxlan_port of the caller in order to
35e42379
JG		 2190 * supply the listening VXLAN udp ports. Callers are expected
2191 * to implement the ndo_add_vxlan_port.
53cf5275
JG		 2192 */
2193void vxlan_get_rx_port(struct net_device *dev)
2194{
2195 struct vxlan_sock *vs;
2196 struct net *net = dev_net(dev);
2197 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2198 sa_family_t sa_family;
35e42379
JG		 2199 __be16 port;
2200 unsigned int i;
53cf5275
JG		 2201
2202 spin_lock(&vn->sock_lock);
2203 for (i = 0; i < PORT_HASH_SIZE; ++i) {
35e42379
JG		 2204 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2205 port = inet_sk(vs->sock->sk)->inet_sport;
53cf5275
JG		 2206 sa_family = vs->sock->sk->sk_family;
2207 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
2208 port);
2209 }
2210 }
2211 spin_unlock(&vn->sock_lock);
2212}
2213EXPORT_SYMBOL_GPL(vxlan_get_rx_port);
2214
d342894c 2215/* Initialize the device structure. */
2216static void vxlan_setup(struct net_device *dev)
2217{
2218 struct vxlan_dev *vxlan = netdev_priv(dev);
31fec5aa 2219 unsigned int h;
d342894c 2220
2221 eth_hw_addr_random(dev);
2222 ether_setup(dev);
e4c7ed41 2223 if (vxlan->default_dst.remote_ip.sa.sa_family == AF_INET6)
2853af6a 2224 dev->needed_headroom = ETH_HLEN + VXLAN6_HEADROOM;
e4c7ed41 2225 else
2853af6a 2226 dev->needed_headroom = ETH_HLEN + VXLAN_HEADROOM;
d342894c 2227
2228 dev->netdev_ops = &vxlan_netdev_ops;
ebf4063e 2229 dev->destructor = free_netdev;
d342894c 2230 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2231
2232 dev->tx_queue_len = 0;
2233 dev->features |= NETIF_F_LLTX;
d6727fe3 2234 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
0afb1666 2235 dev->features |= NETIF_F_RXCSUM;
05c0db08 2236 dev->features |= NETIF_F_GSO_SOFTWARE;
0afb1666 2237
1eaa8178
PS		 2238 dev->vlan_features = dev->features;
2239 dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
0afb1666 2240 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
05c0db08 2241 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1eaa8178 2242 dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
d342894c 2243 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
6602d007 2244 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
d342894c 2245
553675fb 2246 INIT_LIST_HEAD(&vxlan->next);
d342894c 2247 spin_lock_init(&vxlan->hash_lock);
3fc2de2f 2248 INIT_WORK(&vxlan->igmp_join, vxlan_igmp_join);
2249 INIT_WORK(&vxlan->igmp_leave, vxlan_igmp_leave);
1c51a915 2250 INIT_WORK(&vxlan->sock_work, vxlan_sock_work);
d342894c 2251
2252 init_timer_deferrable(&vxlan->age_timer);
2253 vxlan->age_timer.function = vxlan_cleanup;
2254 vxlan->age_timer.data = (unsigned long) vxlan;
2255
823aa873 2256 vxlan->dst_port = htons(vxlan_port);
05f47d69 2257
d342894c 2258 vxlan->dev = dev;
2259
2260 for (h = 0; h < FDB_HASH_SIZE; ++h)
2261 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2262}
2263
2264static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2265 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
5d174dd8 2266 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
e4c7ed41 2267 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
d342894c 2268 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
2269 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
e4c7ed41 2270 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
d342894c 2271 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
2272 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
2273 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
2274 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
2275 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
05f47d69 2276 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
e4f67add
DS		 2277 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
2278 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
2279 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
2280 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
823aa873 2281 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
d342894c 2282};
2283
2284static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2285{
2286 if (tb[IFLA_ADDRESS]) {
2287 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2288 pr_debug("invalid link address (not ethernet)\n");
2289 return -EINVAL;
2290 }
2291
2292 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2293 pr_debug("invalid all zero ethernet address\n");
2294 return -EADDRNOTAVAIL;
2295 }
2296 }
2297
2298 if (!data)
2299 return -EINVAL;
2300
2301 if (data[IFLA_VXLAN_ID]) {
2302 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2303 if (id >= VXLAN_VID_MASK)
2304 return -ERANGE;
2305 }
2306
05f47d69 2307 if (data[IFLA_VXLAN_PORT_RANGE]) {
2308 const struct ifla_vxlan_port_range *p
2309 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2310
2311 if (ntohs(p->high) < ntohs(p->low)) {
2312 pr_debug("port range %u .. %u not valid\n",
2313 ntohs(p->low), ntohs(p->high));
2314 return -EINVAL;
2315 }
2316 }
2317
d342894c 2318 return 0;
2319}
2320
1b13c97f
YB		 2321static void vxlan_get_drvinfo(struct net_device *netdev,
2322 struct ethtool_drvinfo *drvinfo)
2323{
2324 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2325 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2326}
2327
2328static const struct ethtool_ops vxlan_ethtool_ops = {
2329 .get_drvinfo = vxlan_get_drvinfo,
2330 .get_link = ethtool_op_get_link,
2331};
2332
553675fb 2333static void vxlan_del_work(struct work_struct *work)
2334{
2335 struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
2336
2337 sk_release_kernel(vs->sock->sk);
2338 kfree_rcu(vs, rcu);
2339}
2340
3ee64f39
TH		 2341static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2342 __be16 port, u32 flags)
553675fb 2343{
e4c7ed41 2344 struct socket *sock;
3ee64f39
TH		 2345 struct udp_port_cfg udp_conf;
2346 int err;
e4c7ed41 2347
3ee64f39 2348 memset(&udp_conf, 0, sizeof(udp_conf));
e4c7ed41 2349
3ee64f39
TH		 2350 if (ipv6) {
2351 udp_conf.family = AF_INET6;
2352 udp_conf.use_udp6_tx_checksums =
2353 !!(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2354 udp_conf.use_udp6_rx_checksums =
2355 !!(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2356 } else {
2357 udp_conf.family = AF_INET;
2358 udp_conf.local_ip.s_addr = INADDR_ANY;
2359 udp_conf.use_udp_checksums =
2360 !!(flags & VXLAN_F_UDP_CSUM);
e4c7ed41 2361 }
e4c7ed41 2362
3ee64f39 2363 udp_conf.local_udp_port = port;
553675fb 2364
3ee64f39
TH		 2365 /* Open UDP socket */
2366 err = udp_sock_create(net, &udp_conf, &sock);
2367 if (err < 0)
2368 return ERR_PTR(err);
e4c7ed41 2369
e4c7ed41 2370 /* Disable multicast loopback */
3ee64f39 2371 inet_sk(sock->sk)->mc_loop = 0;
359a0ea9 2372
c60c308c
TH		 2373 udp_set_convert_csum(sock->sk, true);
2374
39deb2c7 2375 return sock;
e4c7ed41
CW		 2376}
2377
2378/* Create new listen socket if needed */
2379static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port,
359a0ea9
TH		 2380 vxlan_rcv_t *rcv, void *data,
2381 u32 flags)
e4c7ed41
CW		 2382{
2383 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2384 struct vxlan_sock *vs;
2385 struct socket *sock;
2386 struct sock *sk;
e4c7ed41 2387 unsigned int h;
359a0ea9 2388 bool ipv6 = !!(flags & VXLAN_F_IPV6);
e4c7ed41 2389
dc01e7d3 2390 vs = kzalloc(sizeof(*vs), GFP_KERNEL);
e4c7ed41
CW		 2391 if (!vs)
2392 return ERR_PTR(-ENOMEM);
2393
2394 for (h = 0; h < VNI_HASH_SIZE; ++h)
2395 INIT_HLIST_HEAD(&vs->vni_list[h]);
2396
2397 INIT_WORK(&vs->del_work, vxlan_del_work);
2398
3ee64f39 2399 sock = vxlan_create_sock(net, ipv6, port, flags);
39deb2c7 2400 if (IS_ERR(sock)) {
553675fb 2401 kfree(vs);
e50fddc8 2402 return ERR_CAST(sock);
553675fb 2403 }
e4c7ed41
CW		 2404
2405 vs->sock = sock;
2406 sk = sock->sk;
9c2e24e1 2407 atomic_set(&vs->refcnt, 1);
5cfccc5a 2408 vs->rcv = rcv;
012a5729 2409 vs->data = data;
559835ea 2410 rcu_assign_sk_user_data(vs->sock->sk, vs);
553675fb 2411
dc01e7d3
OG		 2412 /* Initialize the vxlan udp offloads structure */
2413 vs->udp_offloads.port = port;
2414 vs->udp_offloads.callbacks.gro_receive = vxlan_gro_receive;
2415 vs->udp_offloads.callbacks.gro_complete = vxlan_gro_complete;
2416
9c2e24e1
PS		 2417 spin_lock(&vn->sock_lock);
2418 hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
dc01e7d3 2419 vxlan_notify_add_rx_port(vs);
9c2e24e1 2420 spin_unlock(&vn->sock_lock);
553675fb 2421
2422 /* Mark socket as an encapsulation socket. */
2423 udp_sk(sk)->encap_type = 1;
2424 udp_sk(sk)->encap_rcv = vxlan_udp_encap_recv;
e4c7ed41
CW		 2425#if IS_ENABLED(CONFIG_IPV6)
2426 if (ipv6)
2427 ipv6_stub->udpv6_encap_enable();
2428 else
2429#endif
2430 udp_encap_enable();
2431
9c2e24e1
PS		 2432 return vs;
2433}
2434
012a5729
PS		 2435struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port,
2436 vxlan_rcv_t *rcv, void *data,
359a0ea9 2437 bool no_share, u32 flags)
9c2e24e1
PS		 2438{
2439 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2440 struct vxlan_sock *vs;
2441
359a0ea9 2442 vs = vxlan_socket_create(net, port, rcv, data, flags);
9c2e24e1
PS		 2443 if (!IS_ERR(vs))
2444 return vs;
553675fb 2445
012a5729
PS		 2446 if (no_share) /* Return error if sharing is not allowed. */
2447 return vs;
2448
9c2e24e1
PS		 2449 spin_lock(&vn->sock_lock);
2450 vs = vxlan_find_sock(net, port);
5cfccc5a
PS		 2451 if (vs) {
2452 if (vs->rcv == rcv)
2453 atomic_inc(&vs->refcnt);
2454 else
2455 vs = ERR_PTR(-EBUSY);
2456 }
2457 spin_unlock(&vn->sock_lock);
2458
2459 if (!vs)
9c2e24e1
PS		 2460 vs = ERR_PTR(-EINVAL);
2461
553675fb 2462 return vs;
2463}
012a5729 2464EXPORT_SYMBOL_GPL(vxlan_sock_add);
553675fb 2465
1c51a915
SH		 2466/* Scheduled at device creation to bind to a socket */
2467static void vxlan_sock_work(struct work_struct *work)
2468{
9c2e24e1 2469 struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, sock_work);
f01ec1c0 2470 struct net *net = vxlan->net;
1c51a915 2471 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
9c2e24e1
PS		 2472 __be16 port = vxlan->dst_port;
2473 struct vxlan_sock *nvs;
1c51a915 2474
359a0ea9 2475 nvs = vxlan_sock_add(net, port, vxlan_rcv, NULL, false, vxlan->flags);
1c51a915 2476 spin_lock(&vn->sock_lock);
9c2e24e1
PS		 2477 if (!IS_ERR(nvs))
2478 vxlan_vs_add_dev(nvs, vxlan);
2479 spin_unlock(&vn->sock_lock);
2480
2481 dev_put(vxlan->dev);
1c51a915
SH		 2482}
2483
d342894c 2484static int vxlan_newlink(struct net *net, struct net_device *dev,
2485 struct nlattr *tb[], struct nlattr *data[])
2486{
553675fb 2487 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
d342894c 2488 struct vxlan_dev *vxlan = netdev_priv(dev);
c7995c43 2489 struct vxlan_rdst *dst = &vxlan->default_dst;
d342894c 2490 __u32 vni;
2491 int err;
e4c7ed41 2492 bool use_ipv6 = false;
d342894c 2493
2494 if (!data[IFLA_VXLAN_ID])
2495 return -EINVAL;
2496
f01ec1c0
ND		 2497 vxlan->net = dev_net(dev);
2498
d342894c 2499 vni = nla_get_u32(data[IFLA_VXLAN_ID]);
c7995c43 2500 dst->remote_vni = vni;
d342894c 2501
5933a7bb
MR		 2502 /* Unless IPv6 is explicitly requested, assume IPv4 */
2503 dst->remote_ip.sa.sa_family = AF_INET;
e4c7ed41
CW		 2504 if (data[IFLA_VXLAN_GROUP]) {
2505 dst->remote_ip.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_GROUP]);
e4c7ed41
CW		 2506 } else if (data[IFLA_VXLAN_GROUP6]) {
2507 if (!IS_ENABLED(CONFIG_IPV6))
2508 return -EPFNOSUPPORT;
2509
2510 nla_memcpy(&dst->remote_ip.sin6.sin6_addr, data[IFLA_VXLAN_GROUP6],
2511 sizeof(struct in6_addr));
2512 dst->remote_ip.sa.sa_family = AF_INET6;
2513 use_ipv6 = true;
2514 }
d342894c 2515
e4c7ed41
CW		 2516 if (data[IFLA_VXLAN_LOCAL]) {
2517 vxlan->saddr.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_LOCAL]);
2518 vxlan->saddr.sa.sa_family = AF_INET;
2519 } else if (data[IFLA_VXLAN_LOCAL6]) {
2520 if (!IS_ENABLED(CONFIG_IPV6))
2521 return -EPFNOSUPPORT;
2522
2523 /* TODO: respect scope id */
2524 nla_memcpy(&vxlan->saddr.sin6.sin6_addr, data[IFLA_VXLAN_LOCAL6],
2525 sizeof(struct in6_addr));
2526 vxlan->saddr.sa.sa_family = AF_INET6;
2527 use_ipv6 = true;
2528 }
d342894c 2529
34e02aa1 2530 if (data[IFLA_VXLAN_LINK] &&
c7995c43 2531 (dst->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]))) {
34e02aa1 2532 struct net_device *lowerdev
c7995c43 2533 = __dev_get_by_index(net, dst->remote_ifindex);
34e02aa1 2534
2535 if (!lowerdev) {
c7995c43 2536 pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
34e02aa1 2537 return -ENODEV;
2538 }
d342894c 2539
e4c7ed41
CW		 2540#if IS_ENABLED(CONFIG_IPV6)
2541 if (use_ipv6) {
2542 struct inet6_dev *idev = __in6_dev_get(lowerdev);
2543 if (idev && idev->cnf.disable_ipv6) {
2544 pr_info("IPv6 is disabled via sysctl\n");
2545 return -EPERM;
2546 }
2547 vxlan->flags |= VXLAN_F_IPV6;
2548 }
2549#endif
2550
34e02aa1 2551 if (!tb[IFLA_MTU])
e4c7ed41 2552 dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
1ba56fb4 2553
2853af6a 2554 dev->needed_headroom = lowerdev->hard_header_len +
e4c7ed41 2555 (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
7bda701e 2556 } else if (use_ipv6)
2557 vxlan->flags |= VXLAN_F_IPV6;
d342894c 2558
2559 if (data[IFLA_VXLAN_TOS])
2560 vxlan->tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
2561
afb97186
VB		 2562 if (data[IFLA_VXLAN_TTL])
2563 vxlan->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
2564
d342894c 2565 if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
e4f67add 2566 vxlan->flags |= VXLAN_F_LEARN;
d342894c 2567
2568 if (data[IFLA_VXLAN_AGEING])
2569 vxlan->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
2570 else
2571 vxlan->age_interval = FDB_AGE_DEFAULT;
2572
e4f67add
DS		 2573 if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
2574 vxlan->flags |= VXLAN_F_PROXY;
2575
2576 if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
2577 vxlan->flags |= VXLAN_F_RSC;
2578
2579 if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
2580 vxlan->flags |= VXLAN_F_L2MISS;
2581
2582 if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
2583 vxlan->flags |= VXLAN_F_L3MISS;
2584
d342894c 2585 if (data[IFLA_VXLAN_LIMIT])
2586 vxlan->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
2587
05f47d69 2588 if (data[IFLA_VXLAN_PORT_RANGE]) {
2589 const struct ifla_vxlan_port_range *p
2590 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2591 vxlan->port_min = ntohs(p->low);
2592 vxlan->port_max = ntohs(p->high);
2593 }
2594
823aa873 2595 if (data[IFLA_VXLAN_PORT])
2596 vxlan->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
2597
359a0ea9
TH		 2598 if (data[IFLA_VXLAN_UDP_CSUM] && nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
2599 vxlan->flags |= VXLAN_F_UDP_CSUM;
2600
2601 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
2602 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
2603 vxlan->flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
2604
2605 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
2606 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
2607 vxlan->flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
2608
553675fb 2609 if (vxlan_find_vni(net, vni, vxlan->dst_port)) {
2610 pr_info("duplicate VNI %u\n", vni);
2611 return -EEXIST;
2612 }
2613
7ad24ea4 2614 dev->ethtool_ops = &vxlan_ethtool_ops;
1b13c97f 2615
2936b6ab
SS		 2616 /* create an fdb entry for a valid default destination */
2617 if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2618 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2619 &vxlan->default_dst.remote_ip,
2620 NUD_REACHABLE|NUD_PERMANENT,
2621 NLM_F_EXCL|NLM_F_CREATE,
2622 vxlan->dst_port,
2623 vxlan->default_dst.remote_vni,
2624 vxlan->default_dst.remote_ifindex,
2625 NTF_SELF);
2626 if (err)
2627 return err;
2628 }
d342894c 2629
afbd8bae
MR		 2630 err = register_netdevice(dev);
2631 if (err) {
ba609e9b 2632 vxlan_fdb_delete_default(vxlan);
afbd8bae
MR		 2633 return err;
2634 }
2635
553675fb 2636 list_add(&vxlan->next, &vn->vxlan_list);
553675fb 2637
2638 return 0;
d342894c 2639}
2640
2641static void vxlan_dellink(struct net_device *dev, struct list_head *head)
2642{
2643 struct vxlan_dev *vxlan = netdev_priv(dev);
f01ec1c0 2644 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
d342894c 2645
fe5c3561 2646 spin_lock(&vn->sock_lock);
9c2e24e1
PS		 2647 if (!hlist_unhashed(&vxlan->hlist))
2648 hlist_del_rcu(&vxlan->hlist);
fe5c3561 2649 spin_unlock(&vn->sock_lock);
2650
553675fb 2651 list_del(&vxlan->next);
d342894c 2652 unregister_netdevice_queue(dev, head);
2653}
2654
2655static size_t vxlan_get_size(const struct net_device *dev)
2656{
2657
2658 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
e4c7ed41 2659 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
d342894c 2660 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
e4c7ed41 2661 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
d342894c 2662 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
2663 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
2664 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
e4f67add
DS		 2665 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
2666 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
2667 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
2668 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
d342894c 2669 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
2670 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
05f47d69 2671 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
359a0ea9
TH		 2672 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
2673 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
2674 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
2675 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
d342894c 2676 0;
2677}
2678
2679static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
2680{
2681 const struct vxlan_dev *vxlan = netdev_priv(dev);
c7995c43 2682 const struct vxlan_rdst *dst = &vxlan->default_dst;
05f47d69 2683 struct ifla_vxlan_port_range ports = {
2684 .low = htons(vxlan->port_min),
2685 .high = htons(vxlan->port_max),
2686 };
d342894c 2687
c7995c43 2688 if (nla_put_u32(skb, IFLA_VXLAN_ID, dst->remote_vni))
d342894c 2689 goto nla_put_failure;
2690
e4c7ed41
CW		 2691 if (!vxlan_addr_any(&dst->remote_ip)) {
2692 if (dst->remote_ip.sa.sa_family == AF_INET) {
2693 if (nla_put_be32(skb, IFLA_VXLAN_GROUP,
2694 dst->remote_ip.sin.sin_addr.s_addr))
2695 goto nla_put_failure;
2696#if IS_ENABLED(CONFIG_IPV6)
2697 } else {
2698 if (nla_put(skb, IFLA_VXLAN_GROUP6, sizeof(struct in6_addr),
2699 &dst->remote_ip.sin6.sin6_addr))
2700 goto nla_put_failure;
2701#endif
2702 }
2703 }
d342894c 2704
c7995c43 2705 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
d342894c 2706 goto nla_put_failure;
2707
e4c7ed41
CW		 2708 if (!vxlan_addr_any(&vxlan->saddr)) {
2709 if (vxlan->saddr.sa.sa_family == AF_INET) {
2710 if (nla_put_be32(skb, IFLA_VXLAN_LOCAL,
2711 vxlan->saddr.sin.sin_addr.s_addr))
2712 goto nla_put_failure;
2713#if IS_ENABLED(CONFIG_IPV6)
2714 } else {
2715 if (nla_put(skb, IFLA_VXLAN_LOCAL6, sizeof(struct in6_addr),
2716 &vxlan->saddr.sin6.sin6_addr))
2717 goto nla_put_failure;
2718#endif
2719 }
2720 }
d342894c 2721
2722 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->ttl) ||
2723 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->tos) ||
e4f67add
DS		 2724 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
2725 !!(vxlan->flags & VXLAN_F_LEARN)) ||
2726 nla_put_u8(skb, IFLA_VXLAN_PROXY,
2727 !!(vxlan->flags & VXLAN_F_PROXY)) ||
2728 nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
2729 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
2730 !!(vxlan->flags & VXLAN_F_L2MISS)) ||
2731 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
2732 !!(vxlan->flags & VXLAN_F_L3MISS)) ||
d342894c 2733 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->age_interval) ||
823aa873 2734 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->addrmax) ||
359a0ea9
TH		 2735 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->dst_port) ||
2736 nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
2737 !!(vxlan->flags & VXLAN_F_UDP_CSUM)) ||
2738 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
2739 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
2740 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
2741 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)))
d342894c 2742 goto nla_put_failure;
2743
05f47d69 2744 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
2745 goto nla_put_failure;
2746
d342894c 2747 return 0;
2748
2749nla_put_failure:
2750 return -EMSGSIZE;
2751}
2752
2753static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
2754 .kind = "vxlan",
2755 .maxtype = IFLA_VXLAN_MAX,
2756 .policy = vxlan_policy,
2757 .priv_size = sizeof(struct vxlan_dev),
2758 .setup = vxlan_setup,
2759 .validate = vxlan_validate,
2760 .newlink = vxlan_newlink,
2761 .dellink = vxlan_dellink,
2762 .get_size = vxlan_get_size,
2763 .fill_info = vxlan_fill_info,
2764};
2765
acaf4e70
DB		 2766static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
2767 struct net_device *dev)
2768{
2769 struct vxlan_dev *vxlan, *next;
2770 LIST_HEAD(list_kill);
2771
2772 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
2773 struct vxlan_rdst *dst = &vxlan->default_dst;
2774
2775 /* In case we created vxlan device with carrier
2776 * and we loose the carrier due to module unload
2777 * we also need to remove vxlan device. In other
2778 * cases, it's not necessary and remote_ifindex
2779 * is 0 here, so no matches.
2780 */
2781 if (dst->remote_ifindex == dev->ifindex)
2782 vxlan_dellink(vxlan->dev, &list_kill);
2783 }
2784
2785 unregister_netdevice_many(&list_kill);
2786}
2787
2788static int vxlan_lowerdev_event(struct notifier_block *unused,
2789 unsigned long event, void *ptr)
2790{
2791 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
783c1463 2792 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
acaf4e70 2793
783c1463 2794 if (event == NETDEV_UNREGISTER)
acaf4e70
DB		 2795 vxlan_handle_lowerdev_unregister(vn, dev);
2796
2797 return NOTIFY_DONE;
2798}
2799
2800static struct notifier_block vxlan_notifier_block __read_mostly = {
2801 .notifier_call = vxlan_lowerdev_event,
2802};
2803
d342894c 2804static __net_init int vxlan_init_net(struct net *net)
2805{
2806 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
31fec5aa 2807 unsigned int h;
d342894c 2808
553675fb 2809 INIT_LIST_HEAD(&vn->vxlan_list);
1c51a915 2810 spin_lock_init(&vn->sock_lock);
d342894c 2811
553675fb 2812 for (h = 0; h < PORT_HASH_SIZE; ++h)
2813 INIT_HLIST_HEAD(&vn->sock_list[h]);
d342894c 2814
2815 return 0;
2816}
2817
f01ec1c0
ND		 2818static void __net_exit vxlan_exit_net(struct net *net)
2819{
2820 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2821 struct vxlan_dev *vxlan, *next;
2822 struct net_device *dev, *aux;
2823 LIST_HEAD(list);
2824
2825 rtnl_lock();
2826 for_each_netdev_safe(net, dev, aux)
2827 if (dev->rtnl_link_ops == &vxlan_link_ops)
2828 unregister_netdevice_queue(dev, &list);
2829
2830 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
2831 /* If vxlan->dev is in the same netns, it has already been added
2832 * to the list by the previous loop.
2833 */
2834 if (!net_eq(dev_net(vxlan->dev), net))
2835 unregister_netdevice_queue(dev, &list);
2836 }
2837
2838 unregister_netdevice_many(&list);
2839 rtnl_unlock();
2840}
2841
d342894c 2842static struct pernet_operations vxlan_net_ops = {
2843 .init = vxlan_init_net,
f01ec1c0 2844 .exit = vxlan_exit_net,
d342894c 2845 .id = &vxlan_net_id,
2846 .size = sizeof(struct vxlan_net),
2847};
2848
2849static int __init vxlan_init_module(void)
2850{
2851 int rc;
2852
758c57d1
SH		 2853 vxlan_wq = alloc_workqueue("vxlan", 0, 0);
2854 if (!vxlan_wq)
2855 return -ENOMEM;
2856
d342894c 2857 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
2858
783c1463 2859 rc = register_pernet_subsys(&vxlan_net_ops);
d342894c 2860 if (rc)
2861 goto out1;
2862
acaf4e70 2863 rc = register_netdevice_notifier(&vxlan_notifier_block);
d342894c 2864 if (rc)
2865 goto out2;
2866
acaf4e70
DB		 2867 rc = rtnl_link_register(&vxlan_link_ops);
2868 if (rc)
2869 goto out3;
d342894c 2870
acaf4e70
DB		 2871 return 0;
2872out3:
2873 unregister_netdevice_notifier(&vxlan_notifier_block);
d342894c 2874out2:
783c1463 2875 unregister_pernet_subsys(&vxlan_net_ops);
d342894c 2876out1:
758c57d1 2877 destroy_workqueue(vxlan_wq);
d342894c 2878 return rc;
2879}
7332a13b 2880late_initcall(vxlan_init_module);
d342894c 2881
2882static void __exit vxlan_cleanup_module(void)
2883{
b7153984 2884 rtnl_link_unregister(&vxlan_link_ops);
acaf4e70 2885 unregister_netdevice_notifier(&vxlan_notifier_block);
758c57d1 2886 destroy_workqueue(vxlan_wq);
783c1463
DB		 2887 unregister_pernet_subsys(&vxlan_net_ops);
2888 /* rcu_barrier() is called by netns */
d342894c 2889}
2890module_exit(vxlan_cleanup_module);
2891
2892MODULE_LICENSE("GPL");
2893MODULE_VERSION(VXLAN_VERSION);
3b8df3c6 2894MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
ead5139a 2895MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
d342894c 2896MODULE_ALIAS_RTNL_LINK("vxlan");
Linux 6.x block layer and io_uring tree(s)