]> git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blame - drivers/net/vxlan.c
projects / mirror_ubuntu-bionic-kernel.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
udp_tunnel: Pass UDP socket down through udp_tunnel{, 6}_xmit_skb().
[mirror_ubuntu-bionic-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
23c578bf 64/* UDP port for VXLAN traffic.
65 * The IANA assigned port is 4789, but the Linux default is 8472
234f5b73 66 * for compatibility with early adopters.
23c578bf 67 */
9daaa397
SH		 68static unsigned short vxlan_port __read_mostly = 8472;
69module_param_named(udp_port, vxlan_port, ushort, 0444);
d342894c 70MODULE_PARM_DESC(udp_port, "Destination UDP port");
71
72static bool log_ecn_error = true;
73module_param(log_ecn_error, bool, 0644);
74MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
75
60d9d4c6 76static int vxlan_net_id;
553675fb 77
afbd8bae
MR		 78static const u8 all_zeros_mac[ETH_ALEN];
79
553675fb 80/* per-network namespace private data for this module */
81struct vxlan_net {
82 struct list_head vxlan_list;
83 struct hlist_head sock_list[PORT_HASH_SIZE];
1c51a915 84 spinlock_t sock_lock;
553675fb 85};
86
e4c7ed41
CW		 87union vxlan_addr {
88 struct sockaddr_in sin;
89 struct sockaddr_in6 sin6;
90 struct sockaddr sa;
91};
92
6681712d 93struct vxlan_rdst {
e4c7ed41 94 union vxlan_addr remote_ip;
6681712d
DS		 95 __be16 remote_port;
96 u32 remote_vni;
97 u32 remote_ifindex;
3e61aa8f 98 struct list_head list;
bc7892ba 99 struct rcu_head rcu;
6681712d
DS		 100};
101
d342894c 102/* Forwarding table entry */
103struct vxlan_fdb {
104 struct hlist_node hlist; /* linked list of entries */
105 struct rcu_head rcu;
106 unsigned long updated; /* jiffies */
107 unsigned long used;
3e61aa8f 108 struct list_head remotes;
d342894c 109 u16 state; /* see ndm_state */
ae884082 110 u8 flags; /* see ndm_flags */
d342894c 111 u8 eth_addr[ETH_ALEN];
112};
113
d342894c 114/* Pseudo network device */
115struct vxlan_dev {
553675fb 116 struct hlist_node hlist; /* vni hash table */
117 struct list_head next; /* vxlan's per namespace list */
118 struct vxlan_sock *vn_sock; /* listening socket */
d342894c 119 struct net_device *dev;
f01ec1c0 120 struct net *net; /* netns for packet i/o */
c7995c43 121 struct vxlan_rdst default_dst; /* default destination */
e4c7ed41 122 union vxlan_addr saddr; /* source address */
823aa873 123 __be16 dst_port;
05f47d69 124 __u16 port_min; /* source port range */
125 __u16 port_max;
d342894c 126 __u8 tos; /* TOS override */
127 __u8 ttl;
359a0ea9 128 u32 flags; /* VXLAN_F_* in vxlan.h */
d342894c 129
130 unsigned long age_interval;
131 struct timer_list age_timer;
132 spinlock_t hash_lock;
133 unsigned int addrcnt;
134 unsigned int addrmax;
d342894c 135
136 struct hlist_head fdb_head[FDB_HASH_SIZE];
137};
138
139/* salt for hash table */
140static u32 vxlan_salt __read_mostly;
758c57d1 141static struct workqueue_struct *vxlan_wq;
d342894c 142
e4c7ed41
CW		 143#if IS_ENABLED(CONFIG_IPV6)
144static inline
145bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
146{
f0ef3126
JB		 147 if (a->sa.sa_family != b->sa.sa_family)
148 return false;
149 if (a->sa.sa_family == AF_INET6)
150 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
151 else
152 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
e4c7ed41
CW		 153}
154
155static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
156{
f0ef3126
JB		 157 if (ipa->sa.sa_family == AF_INET6)
158 return ipv6_addr_any(&ipa->sin6.sin6_addr);
159 else
160 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
e4c7ed41
CW		 161}
162
163static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
164{
f0ef3126
JB		 165 if (ipa->sa.sa_family == AF_INET6)
166 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
167 else
168 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
e4c7ed41
CW		 169}
170
171static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
172{
f0ef3126 173 if (nla_len(nla) >= sizeof(struct in6_addr)) {
67b61f6c 174 ip->sin6.sin6_addr = nla_get_in6_addr(nla);
f0ef3126
JB		 175 ip->sa.sa_family = AF_INET6;
176 return 0;
177 } else if (nla_len(nla) >= sizeof(__be32)) {
67b61f6c 178 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
f0ef3126
JB		 179 ip->sa.sa_family = AF_INET;
180 return 0;
181 } else {
182 return -EAFNOSUPPORT;
183 }
e4c7ed41
CW		 184}
185
186static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
f0ef3126 187 const union vxlan_addr *ip)
e4c7ed41 188{
f0ef3126 189 if (ip->sa.sa_family == AF_INET6)
930345ea 190 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
f0ef3126 191 else
930345ea 192 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
e4c7ed41
CW		 193}
194
195#else /* !CONFIG_IPV6 */
196
197static inline
198bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
199{
f0ef3126 200 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
e4c7ed41
CW		 201}
202
203static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
204{
f0ef3126 205 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
e4c7ed41
CW		 206}
207
208static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
209{
f0ef3126 210 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
e4c7ed41
CW		 211}
212
213static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
214{
f0ef3126
JB		 215 if (nla_len(nla) >= sizeof(struct in6_addr)) {
216 return -EAFNOSUPPORT;
217 } else if (nla_len(nla) >= sizeof(__be32)) {
67b61f6c 218 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
f0ef3126
JB		 219 ip->sa.sa_family = AF_INET;
220 return 0;
221 } else {
222 return -EAFNOSUPPORT;
223 }
e4c7ed41
CW		 224}
225
226static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
f0ef3126 227 const union vxlan_addr *ip)
e4c7ed41 228{
930345ea 229 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
e4c7ed41
CW		 230}
231#endif
232
553675fb 233/* Virtual Network hash table head */
234static inline struct hlist_head *vni_head(struct vxlan_sock *vs, u32 id)
235{
236 return &vs->vni_list[hash_32(id, VNI_HASH_BITS)];
237}
238
239/* Socket hash table head */
240static inline struct hlist_head *vs_head(struct net *net, __be16 port)
d342894c 241{
242 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
243
553675fb 244 return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
245}
246
3e61aa8f
SH		 247/* First remote destination for a forwarding entry.
248 * Guaranteed to be non-NULL because remotes are never deleted.
249 */
5ca5461c 250static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
3e61aa8f 251{
5ca5461c 252 return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
253}
254
255static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
256{
257 return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
3e61aa8f
SH		 258}
259
ac5132d1
TG		 260/* Find VXLAN socket based on network namespace, address family and UDP port
261 * and enabled unshareable flags.
262 */
263static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
264 __be16 port, u32 flags)
553675fb 265{
266 struct vxlan_sock *vs;
af33c1ad
TH		 267
268 flags &= VXLAN_F_RCV_FLAGS;
553675fb 269
270 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
19ca9fc1 271 if (inet_sk(vs->sock->sk)->inet_sport == port &&
ac5132d1 272 inet_sk(vs->sock->sk)->sk.sk_family == family &&
af33c1ad 273 vs->flags == flags)
553675fb 274 return vs;
275 }
276 return NULL;
d342894c 277}
278
5cfccc5a 279static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, u32 id)
d342894c 280{
281 struct vxlan_dev *vxlan;
d342894c 282
553675fb 283 hlist_for_each_entry_rcu(vxlan, vni_head(vs, id), hlist) {
c7995c43 284 if (vxlan->default_dst.remote_vni == id)
d342894c 285 return vxlan;
286 }
287
288 return NULL;
289}
290
5cfccc5a 291/* Look up VNI in a per net namespace table */
19ca9fc1 292static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id,
ac5132d1
TG		 293 sa_family_t family, __be16 port,
294 u32 flags)
5cfccc5a
PS		 295{
296 struct vxlan_sock *vs;
297
ac5132d1 298 vs = vxlan_find_sock(net, family, port, flags);
5cfccc5a
PS		 299 if (!vs)
300 return NULL;
301
302 return vxlan_vs_find_vni(vs, id);
303}
304
d342894c 305/* Fill in neighbour message in skbuff. */
306static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
234f5b73
SH		 307 const struct vxlan_fdb *fdb,
308 u32 portid, u32 seq, int type, unsigned int flags,
309 const struct vxlan_rdst *rdst)
d342894c 310{
311 unsigned long now = jiffies;
312 struct nda_cacheinfo ci;
313 struct nlmsghdr *nlh;
314 struct ndmsg *ndm;
e4f67add 315 bool send_ip, send_eth;
d342894c 316
317 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
318 if (nlh == NULL)
319 return -EMSGSIZE;
320
321 ndm = nlmsg_data(nlh);
322 memset(ndm, 0, sizeof(*ndm));
e4f67add
DS		 323
324 send_eth = send_ip = true;
325
326 if (type == RTM_GETNEIGH) {
327 ndm->ndm_family = AF_INET;
e4c7ed41 328 send_ip = !vxlan_addr_any(&rdst->remote_ip);
e4f67add
DS		 329 send_eth = !is_zero_ether_addr(fdb->eth_addr);
330 } else
331 ndm->ndm_family = AF_BRIDGE;
d342894c 332 ndm->ndm_state = fdb->state;
333 ndm->ndm_ifindex = vxlan->dev->ifindex;
ae884082 334 ndm->ndm_flags = fdb->flags;
545469f7 335 ndm->ndm_type = RTN_UNICAST;
d342894c 336
193523bf 337 if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
4967082b
ND		 338 nla_put_s32(skb, NDA_LINK_NETNSID,
339 peernet2id(dev_net(vxlan->dev), vxlan->net)))
193523bf
ND		 340 goto nla_put_failure;
341
e4f67add 342 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
d342894c 343 goto nla_put_failure;
344
e4c7ed41 345 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
6681712d
DS		 346 goto nla_put_failure;
347
823aa873 348 if (rdst->remote_port && rdst->remote_port != vxlan->dst_port &&
6681712d
DS		 349 nla_put_be16(skb, NDA_PORT, rdst->remote_port))
350 goto nla_put_failure;
c7995c43 351 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
60d9d4c6 352 nla_put_u32(skb, NDA_VNI, rdst->remote_vni))
6681712d
DS		 353 goto nla_put_failure;
354 if (rdst->remote_ifindex &&
355 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
d342894c 356 goto nla_put_failure;
357
358 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
359 ci.ndm_confirmed = 0;
360 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
361 ci.ndm_refcnt = 0;
362
363 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
364 goto nla_put_failure;
365
053c095a
JB		 366 nlmsg_end(skb, nlh);
367 return 0;
d342894c 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 */
4967082b 382 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
d342894c 383 + nla_total_size(sizeof(struct nda_cacheinfo));
384}
385
9e4b93f9
ND		 386static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
387 struct vxlan_rdst *rd, int type)
d342894c 388{
389 struct net *net = dev_net(vxlan->dev);
390 struct sk_buff *skb;
391 int err = -ENOBUFS;
392
393 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
394 if (skb == NULL)
395 goto errout;
396
9e4b93f9 397 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
d342894c 398 if (err < 0) {
399 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
400 WARN_ON(err == -EMSGSIZE);
401 kfree_skb(skb);
402 goto errout;
403 }
404
405 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
406 return;
407errout:
408 if (err < 0)
409 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
410}
411
e4c7ed41 412static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
e4f67add
DS		 413{
414 struct vxlan_dev *vxlan = netdev_priv(dev);
bb3fd687
SH		 415 struct vxlan_fdb f = {
416 .state = NUD_STALE,
417 };
418 struct vxlan_rdst remote = {
e4c7ed41 419 .remote_ip = *ipa, /* goes to NDA_DST */
bb3fd687
SH		 420 .remote_vni = VXLAN_N_VID,
421 };
3e61aa8f 422
9e4b93f9 423 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
e4f67add
DS		 424}
425
426static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
427{
bb3fd687
SH		 428 struct vxlan_fdb f = {
429 .state = NUD_STALE,
430 };
9e4b93f9 431 struct vxlan_rdst remote = { };
e4f67add 432
e4f67add
DS		 433 memcpy(f.eth_addr, eth_addr, ETH_ALEN);
434
9e4b93f9 435 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
e4f67add
DS		 436}
437
d342894c 438/* Hash Ethernet address */
439static u32 eth_hash(const unsigned char *addr)
440{
441 u64 value = get_unaligned((u64 *)addr);
442
443 /* only want 6 bytes */
444#ifdef __BIG_ENDIAN
d342894c 445 value >>= 16;
321fb991 446#else
447 value <<= 16;
d342894c 448#endif
449 return hash_64(value, FDB_HASH_BITS);
450}
451
452/* Hash chain to use given mac address */
453static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
454 const u8 *mac)
455{
456 return &vxlan->fdb_head[eth_hash(mac)];
457}
458
459/* Look up Ethernet address in forwarding table */
014be2c8 460static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
d342894c 461 const u8 *mac)
d342894c 462{
463 struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
464 struct vxlan_fdb *f;
d342894c 465
b67bfe0d 466 hlist_for_each_entry_rcu(f, head, hlist) {
7367d0b5 467 if (ether_addr_equal(mac, f->eth_addr))
d342894c 468 return f;
469 }
470
471 return NULL;
472}
473
014be2c8
SS		 474static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
475 const u8 *mac)
476{
477 struct vxlan_fdb *f;
478
479 f = __vxlan_find_mac(vxlan, mac);
480 if (f)
481 f->used = jiffies;
482
483 return f;
484}
485
a5e7c10a
MR		 486/* caller should hold vxlan->hash_lock */
487static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
e4c7ed41 488 union vxlan_addr *ip, __be16 port,
a5e7c10a 489 __u32 vni, __u32 ifindex)
6681712d 490{
3e61aa8f 491 struct vxlan_rdst *rd;
6681712d 492
3e61aa8f 493 list_for_each_entry(rd, &f->remotes, list) {
e4c7ed41 494 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
6681712d
DS		 495 rd->remote_port == port &&
496 rd->remote_vni == vni &&
497 rd->remote_ifindex == ifindex)
a5e7c10a 498 return rd;
6681712d 499 }
3e61aa8f 500
a5e7c10a
MR		 501 return NULL;
502}
503
906dc186
TR		 504/* Replace destination of unicast mac */
505static int vxlan_fdb_replace(struct vxlan_fdb *f,
e4c7ed41 506 union vxlan_addr *ip, __be16 port, __u32 vni, __u32 ifindex)
906dc186
TR		 507{
508 struct vxlan_rdst *rd;
509
510 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
511 if (rd)
512 return 0;
513
514 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
515 if (!rd)
516 return 0;
e4c7ed41 517 rd->remote_ip = *ip;
906dc186
TR		 518 rd->remote_port = port;
519 rd->remote_vni = vni;
520 rd->remote_ifindex = ifindex;
521 return 1;
522}
523
a5e7c10a
MR		 524/* Add/update destinations for multicast */
525static int vxlan_fdb_append(struct vxlan_fdb *f,
9e4b93f9
ND		 526 union vxlan_addr *ip, __be16 port, __u32 vni,
527 __u32 ifindex, struct vxlan_rdst **rdp)
a5e7c10a
MR		 528{
529 struct vxlan_rdst *rd;
530
531 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
532 if (rd)
533 return 0;
534
6681712d
DS		 535 rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
536 if (rd == NULL)
537 return -ENOBUFS;
e4c7ed41 538 rd->remote_ip = *ip;
6681712d
DS		 539 rd->remote_port = port;
540 rd->remote_vni = vni;
541 rd->remote_ifindex = ifindex;
3e61aa8f
SH		 542
543 list_add_tail_rcu(&rd->list, &f->remotes);
544
9e4b93f9 545 *rdp = rd;
6681712d
DS		 546 return 1;
547}
548
dfd8645e
TH		 549static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
550 unsigned int off,
551 struct vxlanhdr *vh, size_t hdrlen,
0ace2ca8
TH		 552 u32 data, struct gro_remcsum *grc,
553 bool nopartial)
dfd8645e
TH		 554{
555 size_t start, offset, plen;
dfd8645e
TH		 556
557 if (skb->remcsum_offload)
26c4f7da 558 return NULL;
dfd8645e
TH		 559
560 if (!NAPI_GRO_CB(skb)->csum_valid)
561 return NULL;
562
563 start = (data & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
564 offset = start + ((data & VXLAN_RCO_UDP) ?
565 offsetof(struct udphdr, check) :
566 offsetof(struct tcphdr, check));
567
568 plen = hdrlen + offset + sizeof(u16);
569
570 /* Pull checksum that will be written */
571 if (skb_gro_header_hard(skb, off + plen)) {
572 vh = skb_gro_header_slow(skb, off + plen, off);
573 if (!vh)
574 return NULL;
575 }
576
26c4f7da 577 skb_gro_remcsum_process(skb, (void *)vh + hdrlen,
0ace2ca8 578 start, offset, grc, nopartial);
dfd8645e
TH		 579
580 skb->remcsum_offload = 1;
581
582 return vh;
583}
584
a2b12f3c
TH		 585static struct sk_buff **vxlan_gro_receive(struct sk_buff **head,
586 struct sk_buff *skb,
587 struct udp_offload *uoff)
dc01e7d3
OG		 588{
589 struct sk_buff *p, **pp = NULL;
590 struct vxlanhdr *vh, *vh2;
9b174d88 591 unsigned int hlen, off_vx;
dc01e7d3 592 int flush = 1;
dfd8645e
TH		 593 struct vxlan_sock *vs = container_of(uoff, struct vxlan_sock,
594 udp_offloads);
595 u32 flags;
26c4f7da
TH		 596 struct gro_remcsum grc;
597
598 skb_gro_remcsum_init(&grc);
dc01e7d3
OG		 599
600 off_vx = skb_gro_offset(skb);
601 hlen = off_vx + sizeof(*vh);
602 vh = skb_gro_header_fast(skb, off_vx);
603 if (skb_gro_header_hard(skb, hlen)) {
604 vh = skb_gro_header_slow(skb, hlen, off_vx);
605 if (unlikely(!vh))
606 goto out;
607 }
dc01e7d3 608
dfd8645e
TH		 609 skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
610 skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
611
612 flags = ntohl(vh->vx_flags);
613
614 if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
615 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
0ace2ca8
TH		 616 ntohl(vh->vx_vni), &grc,
617 !!(vs->flags &
618 VXLAN_F_REMCSUM_NOPARTIAL));
dfd8645e
TH		 619
620 if (!vh)
621 goto out;
622 }
623
dc01e7d3
OG		 624 flush = 0;
625
626 for (p = *head; p; p = p->next) {
627 if (!NAPI_GRO_CB(p)->same_flow)
628 continue;
629
630 vh2 = (struct vxlanhdr *)(p->data + off_vx);
3511494c
TG		 631 if (vh->vx_flags != vh2->vx_flags ||
632 vh->vx_vni != vh2->vx_vni) {
dc01e7d3
OG		 633 NAPI_GRO_CB(p)->same_flow = 0;
634 continue;
635 }
dc01e7d3
OG		 636 }
637
9b174d88 638 pp = eth_gro_receive(head, skb);
dc01e7d3 639
dc01e7d3 640out:
26c4f7da 641 skb_gro_remcsum_cleanup(skb, &grc);
dc01e7d3
OG		 642 NAPI_GRO_CB(skb)->flush |= flush;
643
644 return pp;
645}
646
a2b12f3c
TH		 647static int vxlan_gro_complete(struct sk_buff *skb, int nhoff,
648 struct udp_offload *uoff)
dc01e7d3 649{
cfdf1e1b
JG		 650 udp_tunnel_gro_complete(skb, nhoff);
651
9b174d88 652 return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
dc01e7d3
OG		 653}
654
53cf5275 655/* Notify netdevs that UDP port started listening */
dc01e7d3 656static void vxlan_notify_add_rx_port(struct vxlan_sock *vs)
53cf5275
JG		 657{
658 struct net_device *dev;
dc01e7d3 659 struct sock *sk = vs->sock->sk;
53cf5275
JG		 660 struct net *net = sock_net(sk);
661 sa_family_t sa_family = sk->sk_family;
35e42379 662 __be16 port = inet_sk(sk)->inet_sport;
dc01e7d3
OG		 663 int err;
664
665 if (sa_family == AF_INET) {
666 err = udp_add_offload(&vs->udp_offloads);
667 if (err)
668 pr_warn("vxlan: udp_add_offload failed with status %d\n", err);
669 }
53cf5275
JG		 670
671 rcu_read_lock();
672 for_each_netdev_rcu(net, dev) {
673 if (dev->netdev_ops->ndo_add_vxlan_port)
674 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
675 port);
676 }
677 rcu_read_unlock();
678}
679
680/* Notify netdevs that UDP port is no more listening */
dc01e7d3 681static void vxlan_notify_del_rx_port(struct vxlan_sock *vs)
53cf5275
JG		 682{
683 struct net_device *dev;
dc01e7d3 684 struct sock *sk = vs->sock->sk;
53cf5275
JG		 685 struct net *net = sock_net(sk);
686 sa_family_t sa_family = sk->sk_family;
35e42379 687 __be16 port = inet_sk(sk)->inet_sport;
53cf5275
JG		 688
689 rcu_read_lock();
690 for_each_netdev_rcu(net, dev) {
691 if (dev->netdev_ops->ndo_del_vxlan_port)
692 dev->netdev_ops->ndo_del_vxlan_port(dev, sa_family,
693 port);
694 }
695 rcu_read_unlock();
dc01e7d3
OG		 696
697 if (sa_family == AF_INET)
698 udp_del_offload(&vs->udp_offloads);
53cf5275
JG		 699}
700
d342894c 701/* Add new entry to forwarding table -- assumes lock held */
702static int vxlan_fdb_create(struct vxlan_dev *vxlan,
e4c7ed41 703 const u8 *mac, union vxlan_addr *ip,
6681712d 704 __u16 state, __u16 flags,
73cf3317 705 __be16 port, __u32 vni, __u32 ifindex,
ae884082 706 __u8 ndm_flags)
d342894c 707{
9e4b93f9 708 struct vxlan_rdst *rd = NULL;
d342894c 709 struct vxlan_fdb *f;
710 int notify = 0;
711
014be2c8 712 f = __vxlan_find_mac(vxlan, mac);
d342894c 713 if (f) {
714 if (flags & NLM_F_EXCL) {
715 netdev_dbg(vxlan->dev,
716 "lost race to create %pM\n", mac);
717 return -EEXIST;
718 }
719 if (f->state != state) {
720 f->state = state;
721 f->updated = jiffies;
722 notify = 1;
723 }
ae884082
DS		 724 if (f->flags != ndm_flags) {
725 f->flags = ndm_flags;
726 f->updated = jiffies;
727 notify = 1;
728 }
906dc186
TR		 729 if ((flags & NLM_F_REPLACE)) {
730 /* Only change unicasts */
731 if (!(is_multicast_ether_addr(f->eth_addr) ||
732 is_zero_ether_addr(f->eth_addr))) {
733 int rc = vxlan_fdb_replace(f, ip, port, vni,
734 ifindex);
735
736 if (rc < 0)
737 return rc;
738 notify |= rc;
739 } else
740 return -EOPNOTSUPP;
741 }
6681712d 742 if ((flags & NLM_F_APPEND) &&
58e4c767
MR		 743 (is_multicast_ether_addr(f->eth_addr) ||
744 is_zero_ether_addr(f->eth_addr))) {
9e4b93f9
ND		 745 int rc = vxlan_fdb_append(f, ip, port, vni, ifindex,
746 &rd);
6681712d
DS		 747
748 if (rc < 0)
749 return rc;
750 notify |= rc;
751 }
d342894c 752 } else {
753 if (!(flags & NLM_F_CREATE))
754 return -ENOENT;
755
756 if (vxlan->addrmax && vxlan->addrcnt >= vxlan->addrmax)
757 return -ENOSPC;
758
906dc186
TR		 759 /* Disallow replace to add a multicast entry */
760 if ((flags & NLM_F_REPLACE) &&
761 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
762 return -EOPNOTSUPP;
763
e4c7ed41 764 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
d342894c 765 f = kmalloc(sizeof(*f), GFP_ATOMIC);
766 if (!f)
767 return -ENOMEM;
768
769 notify = 1;
d342894c 770 f->state = state;
ae884082 771 f->flags = ndm_flags;
d342894c 772 f->updated = f->used = jiffies;
3e61aa8f 773 INIT_LIST_HEAD(&f->remotes);
d342894c 774 memcpy(f->eth_addr, mac, ETH_ALEN);
775
9e4b93f9 776 vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
3e61aa8f 777
d342894c 778 ++vxlan->addrcnt;
779 hlist_add_head_rcu(&f->hlist,
780 vxlan_fdb_head(vxlan, mac));
781 }
782
9e4b93f9
ND		 783 if (notify) {
784 if (rd == NULL)
785 rd = first_remote_rtnl(f);
786 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
787 }
d342894c 788
789 return 0;
790}
791
6706c82e 792static void vxlan_fdb_free(struct rcu_head *head)
6681712d
DS		 793{
794 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
3e61aa8f 795 struct vxlan_rdst *rd, *nd;
6681712d 796
3e61aa8f 797 list_for_each_entry_safe(rd, nd, &f->remotes, list)
6681712d 798 kfree(rd);
6681712d
DS		 799 kfree(f);
800}
801
d342894c 802static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
803{
804 netdev_dbg(vxlan->dev,
805 "delete %pM\n", f->eth_addr);
806
807 --vxlan->addrcnt;
9e4b93f9 808 vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
d342894c 809
810 hlist_del_rcu(&f->hlist);
6681712d 811 call_rcu(&f->rcu, vxlan_fdb_free);
d342894c 812}
813
f0b074be 814static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
e4c7ed41 815 union vxlan_addr *ip, __be16 *port, u32 *vni, u32 *ifindex)
d342894c 816{
6681712d 817 struct net *net = dev_net(vxlan->dev);
e4c7ed41 818 int err;
d342894c 819
f0b074be 820 if (tb[NDA_DST]) {
e4c7ed41
CW		 821 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
822 if (err)
823 return err;
f0b074be 824 } else {
e4c7ed41
CW		 825 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
826 if (remote->sa.sa_family == AF_INET) {
827 ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
828 ip->sa.sa_family = AF_INET;
829#if IS_ENABLED(CONFIG_IPV6)
830 } else {
831 ip->sin6.sin6_addr = in6addr_any;
832 ip->sa.sa_family = AF_INET6;
833#endif
834 }
f0b074be 835 }
d342894c 836
6681712d 837 if (tb[NDA_PORT]) {
73cf3317 838 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
6681712d 839 return -EINVAL;
f0b074be
MR		 840 *port = nla_get_be16(tb[NDA_PORT]);
841 } else {
842 *port = vxlan->dst_port;
843 }
6681712d
DS		 844
845 if (tb[NDA_VNI]) {
846 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
847 return -EINVAL;
f0b074be
MR		 848 *vni = nla_get_u32(tb[NDA_VNI]);
849 } else {
850 *vni = vxlan->default_dst.remote_vni;
851 }
6681712d
DS		 852
853 if (tb[NDA_IFINDEX]) {
5abb0029 854 struct net_device *tdev;
6681712d
DS		 855
856 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
857 return -EINVAL;
f0b074be 858 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
73763949 859 tdev = __dev_get_by_index(net, *ifindex);
5abb0029 860 if (!tdev)
6681712d 861 return -EADDRNOTAVAIL;
f0b074be
MR		 862 } else {
863 *ifindex = 0;
864 }
865
866 return 0;
867}
868
869/* Add static entry (via netlink) */
870static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
871 struct net_device *dev,
f6f6424b 872 const unsigned char *addr, u16 vid, u16 flags)
f0b074be
MR		 873{
874 struct vxlan_dev *vxlan = netdev_priv(dev);
875 /* struct net *net = dev_net(vxlan->dev); */
e4c7ed41 876 union vxlan_addr ip;
f0b074be
MR		 877 __be16 port;
878 u32 vni, ifindex;
879 int err;
880
881 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
882 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
883 ndm->ndm_state);
884 return -EINVAL;
885 }
886
887 if (tb[NDA_DST] == NULL)
888 return -EINVAL;
889
890 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
891 if (err)
892 return err;
6681712d 893
5933a7bb
MR		 894 if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
895 return -EAFNOSUPPORT;
896
d342894c 897 spin_lock_bh(&vxlan->hash_lock);
e4c7ed41 898 err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
73cf3317 899 port, vni, ifindex, ndm->ndm_flags);
d342894c 900 spin_unlock_bh(&vxlan->hash_lock);
901
902 return err;
903}
904
905/* Delete entry (via netlink) */
1690be63
VY		 906static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
907 struct net_device *dev,
f6f6424b 908 const unsigned char *addr, u16 vid)
d342894c 909{
910 struct vxlan_dev *vxlan = netdev_priv(dev);
911 struct vxlan_fdb *f;
bc7892ba 912 struct vxlan_rdst *rd = NULL;
e4c7ed41 913 union vxlan_addr ip;
bc7892ba
MR		 914 __be16 port;
915 u32 vni, ifindex;
916 int err;
917
918 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
919 if (err)
920 return err;
921
922 err = -ENOENT;
d342894c 923
924 spin_lock_bh(&vxlan->hash_lock);
925 f = vxlan_find_mac(vxlan, addr);
bc7892ba
MR		 926 if (!f)
927 goto out;
928
e4c7ed41
CW		 929 if (!vxlan_addr_any(&ip)) {
930 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
bc7892ba
MR		 931 if (!rd)
932 goto out;
933 }
934
935 err = 0;
936
937 /* remove a destination if it's not the only one on the list,
938 * otherwise destroy the fdb entry
939 */
940 if (rd && !list_is_singular(&f->remotes)) {
941 list_del_rcu(&rd->list);
9e4b93f9 942 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
dcdc7a59 943 kfree_rcu(rd, rcu);
bc7892ba 944 goto out;
d342894c 945 }
bc7892ba
MR		 946
947 vxlan_fdb_destroy(vxlan, f);
948
949out:
d342894c 950 spin_unlock_bh(&vxlan->hash_lock);
951
952 return err;
953}
954
955/* Dump forwarding table */
956static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
5d5eacb3
JHS		 957 struct net_device *dev,
958 struct net_device *filter_dev, int idx)
d342894c 959{
960 struct vxlan_dev *vxlan = netdev_priv(dev);
961 unsigned int h;
962
963 for (h = 0; h < FDB_HASH_SIZE; ++h) {
964 struct vxlan_fdb *f;
d342894c 965 int err;
966
b67bfe0d 967 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
6681712d 968 struct vxlan_rdst *rd;
6681712d 969
3e61aa8f
SH		 970 if (idx < cb->args[0])
971 goto skip;
972
973 list_for_each_entry_rcu(rd, &f->remotes, list) {
6681712d
DS		 974 err = vxlan_fdb_info(skb, vxlan, f,
975 NETLINK_CB(cb->skb).portid,
976 cb->nlh->nlmsg_seq,
977 RTM_NEWNEIGH,
978 NLM_F_MULTI, rd);
979 if (err < 0)
3e61aa8f 980 goto out;
6681712d 981 }
3e61aa8f
SH		 982skip:
983 ++idx;
d342894c 984 }
985 }
3e61aa8f 986out:
d342894c 987 return idx;
988}
989
990/* Watch incoming packets to learn mapping between Ethernet address
991 * and Tunnel endpoint.
c4b49512 992 * Return true if packet is bogus and should be dropped.
d342894c 993 */
26a41ae6 994static bool vxlan_snoop(struct net_device *dev,
e4c7ed41 995 union vxlan_addr *src_ip, const u8 *src_mac)
d342894c 996{
997 struct vxlan_dev *vxlan = netdev_priv(dev);
998 struct vxlan_fdb *f;
d342894c 999
1000 f = vxlan_find_mac(vxlan, src_mac);
1001 if (likely(f)) {
5ca5461c 1002 struct vxlan_rdst *rdst = first_remote_rcu(f);
3e61aa8f 1003
e4c7ed41 1004 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
26a41ae6 1005 return false;
1006
1007 /* Don't migrate static entries, drop packets */
eb064c3b 1008 if (f->state & NUD_NOARP)
26a41ae6 1009 return true;
d342894c 1010
1011 if (net_ratelimit())
1012 netdev_info(dev,
e4c7ed41 1013 "%pM migrated from %pIS to %pIS\n",
a4870f79 1014 src_mac, &rdst->remote_ip.sa, &src_ip->sa);
d342894c 1015
e4c7ed41 1016 rdst->remote_ip = *src_ip;
d342894c 1017 f->updated = jiffies;
9e4b93f9 1018 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
d342894c 1019 } else {
1020 /* learned new entry */
1021 spin_lock(&vxlan->hash_lock);
3bf74b1a 1022
1023 /* close off race between vxlan_flush and incoming packets */
1024 if (netif_running(dev))
1025 vxlan_fdb_create(vxlan, src_mac, src_ip,
1026 NUD_REACHABLE,
1027 NLM_F_EXCL|NLM_F_CREATE,
1028 vxlan->dst_port,
1029 vxlan->default_dst.remote_vni,
1030 0, NTF_SELF);
d342894c 1031 spin_unlock(&vxlan->hash_lock);
1032 }
26a41ae6 1033
1034 return false;
d342894c 1035}
1036
d342894c 1037/* See if multicast group is already in use by other ID */
95ab0991 1038static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
d342894c 1039{
553675fb 1040 struct vxlan_dev *vxlan;
d342894c 1041
95ab0991
G		 1042 /* The vxlan_sock is only used by dev, leaving group has
1043 * no effect on other vxlan devices.
1044 */
1045 if (atomic_read(&dev->vn_sock->refcnt) == 1)
1046 return false;
1047
553675fb 1048 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
95ab0991 1049 if (!netif_running(vxlan->dev) || vxlan == dev)
553675fb 1050 continue;
d342894c 1051
95ab0991
G		 1052 if (vxlan->vn_sock != dev->vn_sock)
1053 continue;
1054
1055 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1056 &dev->default_dst.remote_ip))
1057 continue;
1058
1059 if (vxlan->default_dst.remote_ifindex !=
1060 dev->default_dst.remote_ifindex)
1061 continue;
1062
1063 return true;
553675fb 1064 }
d342894c 1065
1066 return false;
1067}
1068
012a5729 1069void vxlan_sock_release(struct vxlan_sock *vs)
7c47cedf 1070{
53cf5275
JG		 1071 struct sock *sk = vs->sock->sk;
1072 struct net *net = sock_net(sk);
1073 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
012a5729 1074
7c47cedf
SH		 1075 if (!atomic_dec_and_test(&vs->refcnt))
1076 return;
d342894c 1077
1c51a915 1078 spin_lock(&vn->sock_lock);
7c47cedf 1079 hlist_del_rcu(&vs->hlist);
dc01e7d3 1080 vxlan_notify_del_rx_port(vs);
1c51a915
SH		 1081 spin_unlock(&vn->sock_lock);
1082
7c47cedf 1083 queue_work(vxlan_wq, &vs->del_work);
d342894c 1084}
012a5729 1085EXPORT_SYMBOL_GPL(vxlan_sock_release);
d342894c 1086
56ef9c90 1087/* Update multicast group membership when first VNI on
c4b49512 1088 * multicast address is brought up
7c47cedf 1089 */
56ef9c90 1090static int vxlan_igmp_join(struct vxlan_dev *vxlan)
d342894c 1091{
7c47cedf
SH		 1092 struct vxlan_sock *vs = vxlan->vn_sock;
1093 struct sock *sk = vs->sock->sk;
e4c7ed41
CW		 1094 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1095 int ifindex = vxlan->default_dst.remote_ifindex;
149d7549 1096 int ret = -EINVAL;
d342894c 1097
d342894c 1098 lock_sock(sk);
e4c7ed41
CW		 1099 if (ip->sa.sa_family == AF_INET) {
1100 struct ip_mreqn mreq = {
1101 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1102 .imr_ifindex = ifindex,
1103 };
1104
56ef9c90 1105 ret = ip_mc_join_group(sk, &mreq);
e4c7ed41
CW		 1106#if IS_ENABLED(CONFIG_IPV6)
1107 } else {
56ef9c90
MRL		 1108 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1109 &ip->sin6.sin6_addr);
e4c7ed41
CW		 1110#endif
1111 }
3fc2de2f 1112 release_sock(sk);
1113
56ef9c90 1114 return ret;
3fc2de2f 1115}
1116
1117/* Inverse of vxlan_igmp_join when last VNI is brought down */
56ef9c90 1118static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
3fc2de2f 1119{
3fc2de2f 1120 struct vxlan_sock *vs = vxlan->vn_sock;
1121 struct sock *sk = vs->sock->sk;
e4c7ed41
CW		 1122 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1123 int ifindex = vxlan->default_dst.remote_ifindex;
149d7549 1124 int ret = -EINVAL;
3fc2de2f 1125
1126 lock_sock(sk);
e4c7ed41
CW		 1127 if (ip->sa.sa_family == AF_INET) {
1128 struct ip_mreqn mreq = {
1129 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1130 .imr_ifindex = ifindex,
1131 };
1132
56ef9c90 1133 ret = ip_mc_leave_group(sk, &mreq);
e4c7ed41
CW		 1134#if IS_ENABLED(CONFIG_IPV6)
1135 } else {
56ef9c90
MRL		 1136 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1137 &ip->sin6.sin6_addr);
e4c7ed41
CW		 1138#endif
1139 }
d342894c 1140 release_sock(sk);
d342894c 1141
56ef9c90 1142 return ret;
d342894c 1143}
1144
dfd8645e 1145static struct vxlanhdr *vxlan_remcsum(struct sk_buff *skb, struct vxlanhdr *vh,
0ace2ca8 1146 size_t hdrlen, u32 data, bool nopartial)
dfd8645e
TH		 1147{
1148 size_t start, offset, plen;
dfd8645e 1149
dfd8645e
TH		 1150 start = (data & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
1151 offset = start + ((data & VXLAN_RCO_UDP) ?
1152 offsetof(struct udphdr, check) :
1153 offsetof(struct tcphdr, check));
1154
1155 plen = hdrlen + offset + sizeof(u16);
1156
1157 if (!pskb_may_pull(skb, plen))
1158 return NULL;
1159
1160 vh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1161
0ace2ca8
TH		 1162 skb_remcsum_process(skb, (void *)vh + hdrlen, start, offset,
1163 nopartial);
dfd8645e
TH		 1164
1165 return vh;
1166}
1167
d342894c 1168/* Callback from net/ipv4/udp.c to receive packets */
1169static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
1170{
5cfccc5a 1171 struct vxlan_sock *vs;
d342894c 1172 struct vxlanhdr *vxh;
3bf39475 1173 u32 flags, vni;
3511494c 1174 struct vxlan_metadata md = {0};
d342894c 1175
d342894c 1176 /* Need Vxlan and inner Ethernet header to be present */
7ce04758 1177 if (!pskb_may_pull(skb, VXLAN_HLEN))
d342894c 1178 goto error;
1179
7ce04758 1180 vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
3bf39475
TH		 1181 flags = ntohl(vxh->vx_flags);
1182 vni = ntohl(vxh->vx_vni);
1183
1184 if (flags & VXLAN_HF_VNI) {
1185 flags &= ~VXLAN_HF_VNI;
1186 } else {
1187 /* VNI flag always required to be set */
1188 goto bad_flags;
d342894c 1189 }
1190
5cfccc5a
PS		 1191 if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB)))
1192 goto drop;
dfd8645e 1193 vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
5cfccc5a 1194
559835ea 1195 vs = rcu_dereference_sk_user_data(sk);
5cfccc5a 1196 if (!vs)
d342894c 1197 goto drop;
d342894c 1198
dfd8645e 1199 if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
0ace2ca8
TH		 1200 vxh = vxlan_remcsum(skb, vxh, sizeof(struct vxlanhdr), vni,
1201 !!(vs->flags & VXLAN_F_REMCSUM_NOPARTIAL));
dfd8645e
TH		 1202 if (!vxh)
1203 goto drop;
1204
1205 flags &= ~VXLAN_HF_RCO;
40fb70f3 1206 vni &= VXLAN_VNI_MASK;
dfd8645e
TH		 1207 }
1208
3511494c
TG		 1209 /* For backwards compatibility, only allow reserved fields to be
1210 * used by VXLAN extensions if explicitly requested.
1211 */
1212 if ((flags & VXLAN_HF_GBP) && (vs->flags & VXLAN_F_GBP)) {
1213 struct vxlanhdr_gbp *gbp;
1214
1215 gbp = (struct vxlanhdr_gbp *)vxh;
1216 md.gbp = ntohs(gbp->policy_id);
1217
1218 if (gbp->dont_learn)
1219 md.gbp |= VXLAN_GBP_DONT_LEARN;
1220
1221 if (gbp->policy_applied)
1222 md.gbp |= VXLAN_GBP_POLICY_APPLIED;
1223
1224 flags &= ~VXLAN_GBP_USED_BITS;
1225 }
1226
40fb70f3 1227 if (flags || vni & ~VXLAN_VNI_MASK) {
3bf39475
TH		 1228 /* If there are any unprocessed flags remaining treat
1229 * this as a malformed packet. This behavior diverges from
1230 * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1231 * in reserved fields are to be ignored. The approach here
c4b49512 1232 * maintains compatibility with previous stack code, and also
3bf39475
TH		 1233 * is more robust and provides a little more security in
1234 * adding extensions to VXLAN.
1235 */
1236
1237 goto bad_flags;
1238 }
1239
3511494c
TG		 1240 md.vni = vxh->vx_vni;
1241 vs->rcv(vs, skb, &md);
5cfccc5a
PS		 1242 return 0;
1243
1244drop:
1245 /* Consume bad packet */
1246 kfree_skb(skb);
1247 return 0;
1248
3bf39475
TH		 1249bad_flags:
1250 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1251 ntohl(vxh->vx_flags), ntohl(vxh->vx_vni));
1252
5cfccc5a
PS		 1253error:
1254 /* Return non vxlan pkt */
1255 return 1;
1256}
1257
3511494c
TG		 1258static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb,
1259 struct vxlan_metadata *md)
5cfccc5a 1260{
e4c7ed41
CW		 1261 struct iphdr *oip = NULL;
1262 struct ipv6hdr *oip6 = NULL;
5cfccc5a 1263 struct vxlan_dev *vxlan;
8f84985f 1264 struct pcpu_sw_netstats *stats;
e4c7ed41 1265 union vxlan_addr saddr;
5cfccc5a 1266 __u32 vni;
e4c7ed41
CW		 1267 int err = 0;
1268 union vxlan_addr *remote_ip;
5cfccc5a 1269
3511494c 1270 vni = ntohl(md->vni) >> 8;
5cfccc5a
PS		 1271 /* Is this VNI defined? */
1272 vxlan = vxlan_vs_find_vni(vs, vni);
1273 if (!vxlan)
d342894c 1274 goto drop;
d342894c 1275
e4c7ed41 1276 remote_ip = &vxlan->default_dst.remote_ip;
e4f67add 1277 skb_reset_mac_header(skb);
f01ec1c0 1278 skb_scrub_packet(skb, !net_eq(vxlan->net, dev_net(vxlan->dev)));
d342894c 1279 skb->protocol = eth_type_trans(skb, vxlan->dev);
f79b064c 1280 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
d342894c 1281
1282 /* Ignore packet loops (and multicast echo) */
7367d0b5 1283 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
d342894c 1284 goto drop;
1285
7ce04758 1286 /* Re-examine inner Ethernet packet */
e4c7ed41
CW		 1287 if (remote_ip->sa.sa_family == AF_INET) {
1288 oip = ip_hdr(skb);
1289 saddr.sin.sin_addr.s_addr = oip->saddr;
1290 saddr.sa.sa_family = AF_INET;
1291#if IS_ENABLED(CONFIG_IPV6)
1292 } else {
1293 oip6 = ipv6_hdr(skb);
1294 saddr.sin6.sin6_addr = oip6->saddr;
1295 saddr.sa.sa_family = AF_INET6;
1296#endif
1297 }
1298
26a41ae6 1299 if ((vxlan->flags & VXLAN_F_LEARN) &&
e4c7ed41 1300 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
26a41ae6 1301 goto drop;
d342894c 1302
d342894c 1303 skb_reset_network_header(skb);
3511494c 1304 skb->mark = md->gbp;
0afb1666 1305
e4c7ed41
CW		 1306 if (oip6)
1307 err = IP6_ECN_decapsulate(oip6, skb);
1308 if (oip)
1309 err = IP_ECN_decapsulate(oip, skb);
1310
d342894c 1311 if (unlikely(err)) {
e4c7ed41
CW		 1312 if (log_ecn_error) {
1313 if (oip6)
1314 net_info_ratelimited("non-ECT from %pI6\n",
1315 &oip6->saddr);
1316 if (oip)
1317 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1318 &oip->saddr, oip->tos);
1319 }
d342894c 1320 if (err > 1) {
1321 ++vxlan->dev->stats.rx_frame_errors;
1322 ++vxlan->dev->stats.rx_errors;
1323 goto drop;
1324 }
1325 }
1326
e8171045 1327 stats = this_cpu_ptr(vxlan->dev->tstats);
d342894c 1328 u64_stats_update_begin(&stats->syncp);
1329 stats->rx_packets++;
1330 stats->rx_bytes += skb->len;
1331 u64_stats_update_end(&stats->syncp);
1332
1333 netif_rx(skb);
1334
5cfccc5a 1335 return;
d342894c 1336drop:
1337 /* Consume bad packet */
1338 kfree_skb(skb);
d342894c 1339}
1340
e4f67add
DS		 1341static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1342{
1343 struct vxlan_dev *vxlan = netdev_priv(dev);
1344 struct arphdr *parp;
1345 u8 *arpptr, *sha;
1346 __be32 sip, tip;
1347 struct neighbour *n;
1348
1349 if (dev->flags & IFF_NOARP)
1350 goto out;
1351
1352 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1353 dev->stats.tx_dropped++;
1354 goto out;
1355 }
1356 parp = arp_hdr(skb);
1357
1358 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1359 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1360 parp->ar_pro != htons(ETH_P_IP) ||
1361 parp->ar_op != htons(ARPOP_REQUEST) ||
1362 parp->ar_hln != dev->addr_len ||
1363 parp->ar_pln != 4)
1364 goto out;
1365 arpptr = (u8 *)parp + sizeof(struct arphdr);
1366 sha = arpptr;
1367 arpptr += dev->addr_len; /* sha */
1368 memcpy(&sip, arpptr, sizeof(sip));
1369 arpptr += sizeof(sip);
1370 arpptr += dev->addr_len; /* tha */
1371 memcpy(&tip, arpptr, sizeof(tip));
1372
1373 if (ipv4_is_loopback(tip) ||
1374 ipv4_is_multicast(tip))
1375 goto out;
1376
1377 n = neigh_lookup(&arp_tbl, &tip, dev);
1378
1379 if (n) {
e4f67add
DS		 1380 struct vxlan_fdb *f;
1381 struct sk_buff *reply;
1382
1383 if (!(n->nud_state & NUD_CONNECTED)) {
1384 neigh_release(n);
1385 goto out;
1386 }
1387
1388 f = vxlan_find_mac(vxlan, n->ha);
e4c7ed41 1389 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
e4f67add
DS		 1390 /* bridge-local neighbor */
1391 neigh_release(n);
1392 goto out;
1393 }
1394
1395 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1396 n->ha, sha);
1397
1398 neigh_release(n);
1399
7346135d
DS		 1400 if (reply == NULL)
1401 goto out;
1402
e4f67add
DS		 1403 skb_reset_mac_header(reply);
1404 __skb_pull(reply, skb_network_offset(reply));
1405 reply->ip_summed = CHECKSUM_UNNECESSARY;
1406 reply->pkt_type = PACKET_HOST;
1407
1408 if (netif_rx_ni(reply) == NET_RX_DROP)
1409 dev->stats.rx_dropped++;
e4c7ed41
CW		 1410 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1411 union vxlan_addr ipa = {
1412 .sin.sin_addr.s_addr = tip,
a45e92a5 1413 .sin.sin_family = AF_INET,
e4c7ed41
CW		 1414 };
1415
1416 vxlan_ip_miss(dev, &ipa);
1417 }
e4f67add
DS		 1418out:
1419 consume_skb(skb);
1420 return NETDEV_TX_OK;
1421}
1422
f564f45c 1423#if IS_ENABLED(CONFIG_IPV6)
4b29dba9
DS		 1424static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1425 struct neighbour *n, bool isrouter)
1426{
1427 struct net_device *dev = request->dev;
1428 struct sk_buff *reply;
1429 struct nd_msg *ns, *na;
1430 struct ipv6hdr *pip6;
1431 u8 *daddr;
1432 int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1433 int ns_olen;
1434 int i, len;
1435
1436 if (dev == NULL)
1437 return NULL;
1438
1439 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1440 sizeof(*na) + na_olen + dev->needed_tailroom;
1441 reply = alloc_skb(len, GFP_ATOMIC);
1442 if (reply == NULL)
1443 return NULL;
1444
1445 reply->protocol = htons(ETH_P_IPV6);
1446 reply->dev = dev;
1447 skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1448 skb_push(reply, sizeof(struct ethhdr));
1449 skb_set_mac_header(reply, 0);
1450
1451 ns = (struct nd_msg *)skb_transport_header(request);
1452
1453 daddr = eth_hdr(request)->h_source;
1454 ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
1455 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1456 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1457 daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1458 break;
1459 }
1460 }
1461
1462 /* Ethernet header */
1463 ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1464 ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1465 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1466 reply->protocol = htons(ETH_P_IPV6);
1467
1468 skb_pull(reply, sizeof(struct ethhdr));
1469 skb_set_network_header(reply, 0);
1470 skb_put(reply, sizeof(struct ipv6hdr));
1471
1472 /* IPv6 header */
1473
1474 pip6 = ipv6_hdr(reply);
1475 memset(pip6, 0, sizeof(struct ipv6hdr));
1476 pip6->version = 6;
1477 pip6->priority = ipv6_hdr(request)->priority;
1478 pip6->nexthdr = IPPROTO_ICMPV6;
1479 pip6->hop_limit = 255;
1480 pip6->daddr = ipv6_hdr(request)->saddr;
1481 pip6->saddr = *(struct in6_addr *)n->primary_key;
1482
1483 skb_pull(reply, sizeof(struct ipv6hdr));
1484 skb_set_transport_header(reply, 0);
1485
1486 na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1487
1488 /* Neighbor Advertisement */
1489 memset(na, 0, sizeof(*na)+na_olen);
1490 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1491 na->icmph.icmp6_router = isrouter;
1492 na->icmph.icmp6_override = 1;
1493 na->icmph.icmp6_solicited = 1;
1494 na->target = ns->target;
1495 ether_addr_copy(&na->opt[2], n->ha);
1496 na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1497 na->opt[1] = na_olen >> 3;
1498
1499 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1500 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1501 csum_partial(na, sizeof(*na)+na_olen, 0));
1502
1503 pip6->payload_len = htons(sizeof(*na)+na_olen);
1504
1505 skb_push(reply, sizeof(struct ipv6hdr));
1506
1507 reply->ip_summed = CHECKSUM_UNNECESSARY;
1508
1509 return reply;
1510}
1511
f564f45c
CW		 1512static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1513{
1514 struct vxlan_dev *vxlan = netdev_priv(dev);
4b29dba9 1515 struct nd_msg *msg;
f564f45c
CW		 1516 const struct ipv6hdr *iphdr;
1517 const struct in6_addr *saddr, *daddr;
4b29dba9
DS		 1518 struct neighbour *n;
1519 struct inet6_dev *in6_dev;
f564f45c
CW		 1520
1521 in6_dev = __in6_dev_get(dev);
1522 if (!in6_dev)
1523 goto out;
1524
f564f45c
CW		 1525 iphdr = ipv6_hdr(skb);
1526 saddr = &iphdr->saddr;
1527 daddr = &iphdr->daddr;
1528
f564f45c
CW		 1529 msg = (struct nd_msg *)skb_transport_header(skb);
1530 if (msg->icmph.icmp6_code != 0 ||
1531 msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1532 goto out;
1533
4b29dba9
DS		 1534 if (ipv6_addr_loopback(daddr) ||
1535 ipv6_addr_is_multicast(&msg->target))
1536 goto out;
1537
1538 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
f564f45c
CW		 1539
1540 if (n) {
1541 struct vxlan_fdb *f;
4b29dba9 1542 struct sk_buff *reply;
f564f45c
CW		 1543
1544 if (!(n->nud_state & NUD_CONNECTED)) {
1545 neigh_release(n);
1546 goto out;
1547 }
1548
1549 f = vxlan_find_mac(vxlan, n->ha);
1550 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1551 /* bridge-local neighbor */
1552 neigh_release(n);
1553 goto out;
1554 }
1555
4b29dba9
DS		 1556 reply = vxlan_na_create(skb, n,
1557 !!(f ? f->flags & NTF_ROUTER : 0));
1558
f564f45c 1559 neigh_release(n);
4b29dba9
DS		 1560
1561 if (reply == NULL)
1562 goto out;
1563
1564 if (netif_rx_ni(reply) == NET_RX_DROP)
1565 dev->stats.rx_dropped++;
1566
f564f45c 1567 } else if (vxlan->flags & VXLAN_F_L3MISS) {
4b29dba9
DS		 1568 union vxlan_addr ipa = {
1569 .sin6.sin6_addr = msg->target,
a45e92a5 1570 .sin6.sin6_family = AF_INET6,
4b29dba9
DS		 1571 };
1572
f564f45c
CW		 1573 vxlan_ip_miss(dev, &ipa);
1574 }
1575
1576out:
1577 consume_skb(skb);
1578 return NETDEV_TX_OK;
1579}
1580#endif
1581
e4f67add
DS		 1582static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1583{
1584 struct vxlan_dev *vxlan = netdev_priv(dev);
1585 struct neighbour *n;
e4f67add
DS		 1586
1587 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1588 return false;
1589
1590 n = NULL;
1591 switch (ntohs(eth_hdr(skb)->h_proto)) {
1592 case ETH_P_IP:
e15a00aa
CW		 1593 {
1594 struct iphdr *pip;
1595
e4f67add
DS		 1596 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1597 return false;
1598 pip = ip_hdr(skb);
1599 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
e4c7ed41
CW		 1600 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1601 union vxlan_addr ipa = {
1602 .sin.sin_addr.s_addr = pip->daddr,
a45e92a5 1603 .sin.sin_family = AF_INET,
e4c7ed41
CW		 1604 };
1605
1606 vxlan_ip_miss(dev, &ipa);
1607 return false;
1608 }
1609
e4f67add 1610 break;
e15a00aa
CW		 1611 }
1612#if IS_ENABLED(CONFIG_IPV6)
1613 case ETH_P_IPV6:
1614 {
1615 struct ipv6hdr *pip6;
1616
1617 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1618 return false;
1619 pip6 = ipv6_hdr(skb);
1620 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1621 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1622 union vxlan_addr ipa = {
1623 .sin6.sin6_addr = pip6->daddr,
a45e92a5 1624 .sin6.sin6_family = AF_INET6,
e15a00aa
CW		 1625 };
1626
1627 vxlan_ip_miss(dev, &ipa);
1628 return false;
1629 }
1630
1631 break;
1632 }
1633#endif
e4f67add
DS		 1634 default:
1635 return false;
1636 }
1637
1638 if (n) {
1639 bool diff;
1640
7367d0b5 1641 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
e4f67add
DS		 1642 if (diff) {
1643 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1644 dev->addr_len);
1645 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1646 }
1647 neigh_release(n);
1648 return diff;
e4c7ed41
CW		 1649 }
1650
e4f67add
DS		 1651 return false;
1652}
1653
af33c1ad 1654static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
3511494c
TG		 1655 struct vxlan_metadata *md)
1656{
1657 struct vxlanhdr_gbp *gbp;
1658
db79a621
TG		 1659 if (!md->gbp)
1660 return;
1661
3511494c
TG		 1662 gbp = (struct vxlanhdr_gbp *)vxh;
1663 vxh->vx_flags |= htonl(VXLAN_HF_GBP);
1664
1665 if (md->gbp & VXLAN_GBP_DONT_LEARN)
1666 gbp->dont_learn = 1;
1667
1668 if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1669 gbp->policy_applied = 1;
1670
1671 gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1672}
1673
e4c7ed41 1674#if IS_ENABLED(CONFIG_IPV6)
79b16aad
DM		 1675static int vxlan6_xmit_skb(struct dst_entry *dst, struct sock *sk,
1676 struct sk_buff *skb,
e4c7ed41
CW		 1677 struct net_device *dev, struct in6_addr *saddr,
1678 struct in6_addr *daddr, __u8 prio, __u8 ttl,
3511494c 1679 __be16 src_port, __be16 dst_port,
af33c1ad 1680 struct vxlan_metadata *md, bool xnet, u32 vxflags)
e4c7ed41 1681{
e4c7ed41 1682 struct vxlanhdr *vxh;
e4c7ed41
CW		 1683 int min_headroom;
1684 int err;
af33c1ad 1685 bool udp_sum = !(vxflags & VXLAN_F_UDP_ZERO_CSUM6_TX);
dfd8645e
TH		 1686 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1687 u16 hdrlen = sizeof(struct vxlanhdr);
1688
af33c1ad 1689 if ((vxflags & VXLAN_F_REMCSUM_TX) &&
dfd8645e
TH		 1690 skb->ip_summed == CHECKSUM_PARTIAL) {
1691 int csum_start = skb_checksum_start_offset(skb);
1692
1693 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1694 !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1695 (skb->csum_offset == offsetof(struct udphdr, check) ||
1696 skb->csum_offset == offsetof(struct tcphdr, check))) {
1697 udp_sum = false;
1698 type |= SKB_GSO_TUNNEL_REMCSUM;
1699 }
1700 }
e4c7ed41 1701
dfd8645e 1702 skb = iptunnel_handle_offloads(skb, udp_sum, type);
74f47278
PS		 1703 if (IS_ERR(skb)) {
1704 err = -EINVAL;
1705 goto err;
1706 }
e4c7ed41 1707
f01ec1c0 1708 skb_scrub_packet(skb, xnet);
963a88b3 1709
e4c7ed41
CW		 1710 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1711 + VXLAN_HLEN + sizeof(struct ipv6hdr)
df8a39de 1712 + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
e4c7ed41
CW		 1713
1714 /* Need space for new headers (invalidates iph ptr) */
1715 err = skb_cow_head(skb, min_headroom);
74f47278
PS		 1716 if (unlikely(err)) {
1717 kfree_skb(skb);
1718 goto err;
1719 }
e4c7ed41 1720
5968250c 1721 skb = vlan_hwaccel_push_inside(skb);
74f47278
PS		 1722 if (WARN_ON(!skb)) {
1723 err = -ENOMEM;
1724 goto err;
1725 }
e4c7ed41
CW		 1726
1727 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
3bf39475 1728 vxh->vx_flags = htonl(VXLAN_HF_VNI);
3511494c 1729 vxh->vx_vni = md->vni;
e4c7ed41 1730
dfd8645e
TH		 1731 if (type & SKB_GSO_TUNNEL_REMCSUM) {
1732 u32 data = (skb_checksum_start_offset(skb) - hdrlen) >>
1733 VXLAN_RCO_SHIFT;
1734
1735 if (skb->csum_offset == offsetof(struct udphdr, check))
1736 data |= VXLAN_RCO_UDP;
1737
1738 vxh->vx_vni |= htonl(data);
1739 vxh->vx_flags |= htonl(VXLAN_HF_RCO);
1740
1741 if (!skb_is_gso(skb)) {
1742 skb->ip_summed = CHECKSUM_NONE;
1743 skb->encapsulation = 0;
1744 }
1745 }
1746
af33c1ad
TH		 1747 if (vxflags & VXLAN_F_GBP)
1748 vxlan_build_gbp_hdr(vxh, vxflags, md);
3511494c 1749
996c9fd1
TH		 1750 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1751
79b16aad 1752 udp_tunnel6_xmit_skb(dst, sk, skb, dev, saddr, daddr, prio,
d998f8ef 1753 ttl, src_port, dst_port,
af33c1ad 1754 !!(vxflags & VXLAN_F_UDP_ZERO_CSUM6_TX));
e4c7ed41 1755 return 0;
74f47278
PS		 1756err:
1757 dst_release(dst);
1758 return err;
e4c7ed41
CW		 1759}
1760#endif
1761
79b16aad 1762int vxlan_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb,
49560532 1763 __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
3511494c 1764 __be16 src_port, __be16 dst_port,
af33c1ad 1765 struct vxlan_metadata *md, bool xnet, u32 vxflags)
49560532
PS		 1766{
1767 struct vxlanhdr *vxh;
649c5b8b 1768 int min_headroom;
49560532 1769 int err;
af33c1ad 1770 bool udp_sum = !!(vxflags & VXLAN_F_UDP_CSUM);
dfd8645e
TH		 1771 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1772 u16 hdrlen = sizeof(struct vxlanhdr);
1773
af33c1ad 1774 if ((vxflags & VXLAN_F_REMCSUM_TX) &&
dfd8645e
TH		 1775 skb->ip_summed == CHECKSUM_PARTIAL) {
1776 int csum_start = skb_checksum_start_offset(skb);
1777
1778 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1779 !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1780 (skb->csum_offset == offsetof(struct udphdr, check) ||
1781 skb->csum_offset == offsetof(struct tcphdr, check))) {
1782 udp_sum = false;
1783 type |= SKB_GSO_TUNNEL_REMCSUM;
1784 }
1785 }
49560532 1786
dfd8645e 1787 skb = iptunnel_handle_offloads(skb, udp_sum, type);
359a0ea9 1788 if (IS_ERR(skb))
74f47278 1789 return PTR_ERR(skb);
49560532 1790
649c5b8b 1791 min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
1eaa8178 1792 + VXLAN_HLEN + sizeof(struct iphdr)
df8a39de 1793 + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
649c5b8b
PS		 1794
1795 /* Need space for new headers (invalidates iph ptr) */
1796 err = skb_cow_head(skb, min_headroom);
74f47278
PS		 1797 if (unlikely(err)) {
1798 kfree_skb(skb);
649c5b8b 1799 return err;
74f47278 1800 }
649c5b8b 1801
5968250c
JP		 1802 skb = vlan_hwaccel_push_inside(skb);
1803 if (WARN_ON(!skb))
1804 return -ENOMEM;
1eaa8178 1805
49560532 1806 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
3bf39475 1807 vxh->vx_flags = htonl(VXLAN_HF_VNI);
3511494c 1808 vxh->vx_vni = md->vni;
49560532 1809
dfd8645e
TH		 1810 if (type & SKB_GSO_TUNNEL_REMCSUM) {
1811 u32 data = (skb_checksum_start_offset(skb) - hdrlen) >>
1812 VXLAN_RCO_SHIFT;
1813
1814 if (skb->csum_offset == offsetof(struct udphdr, check))
1815 data |= VXLAN_RCO_UDP;
1816
1817 vxh->vx_vni |= htonl(data);
1818 vxh->vx_flags |= htonl(VXLAN_HF_RCO);
1819
1820 if (!skb_is_gso(skb)) {
1821 skb->ip_summed = CHECKSUM_NONE;
1822 skb->encapsulation = 0;
1823 }
1824 }
1825
af33c1ad
TH		 1826 if (vxflags & VXLAN_F_GBP)
1827 vxlan_build_gbp_hdr(vxh, vxflags, md);
3511494c 1828
996c9fd1
TH		 1829 skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1830
79b16aad 1831 return udp_tunnel_xmit_skb(rt, sk, skb, src, dst, tos,
d998f8ef 1832 ttl, df, src_port, dst_port, xnet,
af33c1ad 1833 !(vxflags & VXLAN_F_UDP_CSUM));
49560532
PS		 1834}
1835EXPORT_SYMBOL_GPL(vxlan_xmit_skb);
1836
9dcc71e1
SS		 1837/* Bypass encapsulation if the destination is local */
1838static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1839 struct vxlan_dev *dst_vxlan)
1840{
8f84985f 1841 struct pcpu_sw_netstats *tx_stats, *rx_stats;
e4c7ed41
CW		 1842 union vxlan_addr loopback;
1843 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
ce6502a8
LR		 1844 struct net_device *dev = skb->dev;
1845 int len = skb->len;
9dcc71e1 1846
8f84985f
LR		 1847 tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1848 rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
9dcc71e1
SS		 1849 skb->pkt_type = PACKET_HOST;
1850 skb->encapsulation = 0;
1851 skb->dev = dst_vxlan->dev;
1852 __skb_pull(skb, skb_network_offset(skb));
1853
e4c7ed41
CW		 1854 if (remote_ip->sa.sa_family == AF_INET) {
1855 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1856 loopback.sa.sa_family = AF_INET;
1857#if IS_ENABLED(CONFIG_IPV6)
1858 } else {
1859 loopback.sin6.sin6_addr = in6addr_loopback;
1860 loopback.sa.sa_family = AF_INET6;
1861#endif
1862 }
1863
9dcc71e1 1864 if (dst_vxlan->flags & VXLAN_F_LEARN)
e4c7ed41 1865 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
9dcc71e1
SS		 1866
1867 u64_stats_update_begin(&tx_stats->syncp);
1868 tx_stats->tx_packets++;
ce6502a8 1869 tx_stats->tx_bytes += len;
9dcc71e1
SS		 1870 u64_stats_update_end(&tx_stats->syncp);
1871
1872 if (netif_rx(skb) == NET_RX_SUCCESS) {
1873 u64_stats_update_begin(&rx_stats->syncp);
1874 rx_stats->rx_packets++;
ce6502a8 1875 rx_stats->rx_bytes += len;
9dcc71e1
SS		 1876 u64_stats_update_end(&rx_stats->syncp);
1877 } else {
ce6502a8 1878 dev->stats.rx_dropped++;
9dcc71e1
SS		 1879 }
1880}
1881
4ad16930
SH		 1882static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1883 struct vxlan_rdst *rdst, bool did_rsc)
d342894c 1884{
1885 struct vxlan_dev *vxlan = netdev_priv(dev);
79b16aad 1886 struct sock *sk = vxlan->vn_sock->sock->sk;
e4c7ed41 1887 struct rtable *rt = NULL;
d342894c 1888 const struct iphdr *old_iph;
d342894c 1889 struct flowi4 fl4;
e4c7ed41 1890 union vxlan_addr *dst;
3511494c 1891 struct vxlan_metadata md;
e4c7ed41 1892 __be16 src_port = 0, dst_port;
234f5b73 1893 u32 vni;
d342894c 1894 __be16 df = 0;
1895 __u8 tos, ttl;
0e6fbc5b 1896 int err;
d342894c 1897
823aa873 1898 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->dst_port;
6681712d 1899 vni = rdst->remote_vni;
e4c7ed41 1900 dst = &rdst->remote_ip;
e4f67add 1901
e4c7ed41 1902 if (vxlan_addr_any(dst)) {
e4f67add 1903 if (did_rsc) {
e4f67add 1904 /* short-circuited back to local bridge */
9dcc71e1 1905 vxlan_encap_bypass(skb, vxlan, vxlan);
4ad16930 1906 return;
e4f67add 1907 }
ef59febe 1908 goto drop;
e4f67add 1909 }
ef59febe 1910
d342894c 1911 old_iph = ip_hdr(skb);
1912
d342894c 1913 ttl = vxlan->ttl;
e4c7ed41 1914 if (!ttl && vxlan_addr_multicast(dst))
d342894c 1915 ttl = 1;
1916
1917 tos = vxlan->tos;
1918 if (tos == 1)
206aaafc 1919 tos = ip_tunnel_get_dsfield(old_iph, skb);
d342894c 1920
535fb8d0
TH		 1921 src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->port_min,
1922 vxlan->port_max, true);
d342894c 1923
e4c7ed41
CW		 1924 if (dst->sa.sa_family == AF_INET) {
1925 memset(&fl4, 0, sizeof(fl4));
1926 fl4.flowi4_oif = rdst->remote_ifindex;
1927 fl4.flowi4_tos = RT_TOS(tos);
1928 fl4.daddr = dst->sin.sin_addr.s_addr;
1929 fl4.saddr = vxlan->saddr.sin.sin_addr.s_addr;
1930
f01ec1c0 1931 rt = ip_route_output_key(vxlan->net, &fl4);
e4c7ed41
CW		 1932 if (IS_ERR(rt)) {
1933 netdev_dbg(dev, "no route to %pI4\n",
1934 &dst->sin.sin_addr.s_addr);
1935 dev->stats.tx_carrier_errors++;
1936 goto tx_error;
1937 }
d342894c 1938
e4c7ed41
CW		 1939 if (rt->dst.dev == dev) {
1940 netdev_dbg(dev, "circular route to %pI4\n",
1941 &dst->sin.sin_addr.s_addr);
1942 dev->stats.collisions++;
fffc15a5 1943 goto rt_tx_error;
e4c7ed41
CW		 1944 }
1945
1946 /* Bypass encapsulation if the destination is local */
1947 if (rt->rt_flags & RTCF_LOCAL &&
1948 !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1949 struct vxlan_dev *dst_vxlan;
1950
1951 ip_rt_put(rt);
19ca9fc1 1952 dst_vxlan = vxlan_find_vni(vxlan->net, vni,
ac5132d1
TG		 1953 dst->sa.sa_family, dst_port,
1954 vxlan->flags);
e4c7ed41
CW		 1955 if (!dst_vxlan)
1956 goto tx_error;
1957 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1958 return;
1959 }
1960
1961 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
1962 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
3511494c
TG		 1963 md.vni = htonl(vni << 8);
1964 md.gbp = skb->mark;
d342894c 1965
79b16aad 1966 err = vxlan_xmit_skb(rt, sk, skb, fl4.saddr,
af33c1ad
TH		 1967 dst->sin.sin_addr.s_addr, tos, ttl, df,
1968 src_port, dst_port, &md,
1969 !net_eq(vxlan->net, dev_net(vxlan->dev)),
1970 vxlan->flags);
74f47278
PS		 1971 if (err < 0) {
1972 /* skb is already freed. */
1973 skb = NULL;
e4c7ed41 1974 goto rt_tx_error;
74f47278
PS		 1975 }
1976
e4c7ed41
CW		 1977 iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
1978#if IS_ENABLED(CONFIG_IPV6)
1979 } else {
1980 struct sock *sk = vxlan->vn_sock->sock->sk;
1981 struct dst_entry *ndst;
1982 struct flowi6 fl6;
1983 u32 flags;
1984
1985 memset(&fl6, 0, sizeof(fl6));
1986 fl6.flowi6_oif = rdst->remote_ifindex;
1987 fl6.daddr = dst->sin6.sin6_addr;
1988 fl6.saddr = vxlan->saddr.sin6.sin6_addr;
8c1bb79f 1989 fl6.flowi6_proto = IPPROTO_UDP;
e4c7ed41
CW		 1990
1991 if (ipv6_stub->ipv6_dst_lookup(sk, &ndst, &fl6)) {
1992 netdev_dbg(dev, "no route to %pI6\n",
1993 &dst->sin6.sin6_addr);
1994 dev->stats.tx_carrier_errors++;
9dcc71e1 1995 goto tx_error;
e4c7ed41 1996 }
d342894c 1997
e4c7ed41
CW		 1998 if (ndst->dev == dev) {
1999 netdev_dbg(dev, "circular route to %pI6\n",
2000 &dst->sin6.sin6_addr);
2001 dst_release(ndst);
2002 dev->stats.collisions++;
2003 goto tx_error;
2004 }
0e6fbc5b 2005
e4c7ed41
CW		 2006 /* Bypass encapsulation if the destination is local */
2007 flags = ((struct rt6_info *)ndst)->rt6i_flags;
2008 if (flags & RTF_LOCAL &&
2009 !(flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2010 struct vxlan_dev *dst_vxlan;
2011
2012 dst_release(ndst);
19ca9fc1 2013 dst_vxlan = vxlan_find_vni(vxlan->net, vni,
ac5132d1
TG		 2014 dst->sa.sa_family, dst_port,
2015 vxlan->flags);
e4c7ed41
CW		 2016 if (!dst_vxlan)
2017 goto tx_error;
2018 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2019 return;
2020 }
49560532 2021
e4c7ed41 2022 ttl = ttl ? : ip6_dst_hoplimit(ndst);
3511494c
TG		 2023 md.vni = htonl(vni << 8);
2024 md.gbp = skb->mark;
e4c7ed41 2025
79b16aad 2026 err = vxlan6_xmit_skb(ndst, sk, skb, dev, &fl6.saddr, &fl6.daddr,
af33c1ad
TH		 2027 0, ttl, src_port, dst_port, &md,
2028 !net_eq(vxlan->net, dev_net(vxlan->dev)),
2029 vxlan->flags);
e4c7ed41
CW		 2030#endif
2031 }
0e6fbc5b 2032
4ad16930 2033 return;
d342894c 2034
2035drop:
2036 dev->stats.tx_dropped++;
2037 goto tx_free;
2038
49560532
PS		 2039rt_tx_error:
2040 ip_rt_put(rt);
d342894c 2041tx_error:
2042 dev->stats.tx_errors++;
2043tx_free:
2044 dev_kfree_skb(skb);
d342894c 2045}
2046
6681712d
DS		 2047/* Transmit local packets over Vxlan
2048 *
2049 * Outer IP header inherits ECN and DF from inner header.
2050 * Outer UDP destination is the VXLAN assigned port.
2051 * source port is based on hash of flow
2052 */
2053static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2054{
2055 struct vxlan_dev *vxlan = netdev_priv(dev);
2056 struct ethhdr *eth;
2057 bool did_rsc = false;
8f646c92 2058 struct vxlan_rdst *rdst, *fdst = NULL;
6681712d 2059 struct vxlan_fdb *f;
6681712d
DS		 2060
2061 skb_reset_mac_header(skb);
2062 eth = eth_hdr(skb);
2063
f564f45c
CW		 2064 if ((vxlan->flags & VXLAN_F_PROXY)) {
2065 if (ntohs(eth->h_proto) == ETH_P_ARP)
2066 return arp_reduce(dev, skb);
2067#if IS_ENABLED(CONFIG_IPV6)
2068 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
91269e39
LR		 2069 pskb_may_pull(skb, sizeof(struct ipv6hdr)
2070 + sizeof(struct nd_msg)) &&
f564f45c
CW		 2071 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2072 struct nd_msg *msg;
2073
2074 msg = (struct nd_msg *)skb_transport_header(skb);
2075 if (msg->icmph.icmp6_code == 0 &&
2076 msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2077 return neigh_reduce(dev, skb);
2078 }
7a9f526f 2079 eth = eth_hdr(skb);
f564f45c
CW		 2080#endif
2081 }
6681712d
DS		 2082
2083 f = vxlan_find_mac(vxlan, eth->h_dest);
ae884082
DS		 2084 did_rsc = false;
2085
2086 if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
e15a00aa
CW		 2087 (ntohs(eth->h_proto) == ETH_P_IP ||
2088 ntohs(eth->h_proto) == ETH_P_IPV6)) {
ae884082
DS		 2089 did_rsc = route_shortcircuit(dev, skb);
2090 if (did_rsc)
2091 f = vxlan_find_mac(vxlan, eth->h_dest);
2092 }
2093
6681712d 2094 if (f == NULL) {
afbd8bae
MR		 2095 f = vxlan_find_mac(vxlan, all_zeros_mac);
2096 if (f == NULL) {
2097 if ((vxlan->flags & VXLAN_F_L2MISS) &&
2098 !is_multicast_ether_addr(eth->h_dest))
2099 vxlan_fdb_miss(vxlan, eth->h_dest);
2100
2101 dev->stats.tx_dropped++;
8f646c92 2102 kfree_skb(skb);
afbd8bae
MR		 2103 return NETDEV_TX_OK;
2104 }
2105 }
6681712d 2106
afbd8bae
MR		 2107 list_for_each_entry_rcu(rdst, &f->remotes, list) {
2108 struct sk_buff *skb1;
6681712d 2109
8f646c92
ED		 2110 if (!fdst) {
2111 fdst = rdst;
2112 continue;
2113 }
afbd8bae
MR		 2114 skb1 = skb_clone(skb, GFP_ATOMIC);
2115 if (skb1)
2116 vxlan_xmit_one(skb1, dev, rdst, did_rsc);
6681712d
DS		 2117 }
2118
8f646c92
ED		 2119 if (fdst)
2120 vxlan_xmit_one(skb, dev, fdst, did_rsc);
2121 else
2122 kfree_skb(skb);
4ad16930 2123 return NETDEV_TX_OK;
6681712d
DS		 2124}
2125
d342894c 2126/* Walk the forwarding table and purge stale entries */
2127static void vxlan_cleanup(unsigned long arg)
2128{
2129 struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
2130 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2131 unsigned int h;
2132
2133 if (!netif_running(vxlan->dev))
2134 return;
2135
2136 spin_lock_bh(&vxlan->hash_lock);
2137 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2138 struct hlist_node *p, *n;
2139 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2140 struct vxlan_fdb *f
2141 = container_of(p, struct vxlan_fdb, hlist);
2142 unsigned long timeout;
2143
3c172868 2144 if (f->state & NUD_PERMANENT)
d342894c 2145 continue;
2146
2147 timeout = f->used + vxlan->age_interval * HZ;
2148 if (time_before_eq(timeout, jiffies)) {
2149 netdev_dbg(vxlan->dev,
2150 "garbage collect %pM\n",
2151 f->eth_addr);
2152 f->state = NUD_STALE;
2153 vxlan_fdb_destroy(vxlan, f);
2154 } else if (time_before(timeout, next_timer))
2155 next_timer = timeout;
2156 }
2157 }
2158 spin_unlock_bh(&vxlan->hash_lock);
2159
2160 mod_timer(&vxlan->age_timer, next_timer);
2161}
2162
9c2e24e1
PS		 2163static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
2164{
56ef9c90 2165 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
9c2e24e1
PS		 2166 __u32 vni = vxlan->default_dst.remote_vni;
2167
2168 vxlan->vn_sock = vs;
56ef9c90 2169 spin_lock(&vn->sock_lock);
9c2e24e1 2170 hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
56ef9c90 2171 spin_unlock(&vn->sock_lock);
9c2e24e1
PS		 2172}
2173
d342894c 2174/* Setup stats when device is created */
2175static int vxlan_init(struct net_device *dev)
2176{
1c213bd2 2177 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
e8171045 2178 if (!dev->tstats)
d342894c 2179 return -ENOMEM;
2180
2181 return 0;
2182}
2183
ba609e9b 2184static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
afbd8bae
MR		 2185{
2186 struct vxlan_fdb *f;
2187
2188 spin_lock_bh(&vxlan->hash_lock);
2189 f = __vxlan_find_mac(vxlan, all_zeros_mac);
2190 if (f)
2191 vxlan_fdb_destroy(vxlan, f);
2192 spin_unlock_bh(&vxlan->hash_lock);
2193}
2194
ebf4063e
SH		 2195static void vxlan_uninit(struct net_device *dev)
2196{
2197 struct vxlan_dev *vxlan = netdev_priv(dev);
ebf4063e 2198
ba609e9b 2199 vxlan_fdb_delete_default(vxlan);
afbd8bae 2200
ebf4063e
SH		 2201 free_percpu(dev->tstats);
2202}
2203
d342894c 2204/* Start ageing timer and join group when device is brought up */
2205static int vxlan_open(struct net_device *dev)
2206{
2207 struct vxlan_dev *vxlan = netdev_priv(dev);
56ef9c90
MRL		 2208 struct vxlan_sock *vs;
2209 int ret = 0;
1c51a915 2210
56ef9c90
MRL		 2211 vs = vxlan_sock_add(vxlan->net, vxlan->dst_port, vxlan_rcv, NULL,
2212 false, vxlan->flags);
2213 if (IS_ERR(vs))
2214 return PTR_ERR(vs);
2215
2216 vxlan_vs_add_dev(vs, vxlan);
d342894c 2217
79d4a94f 2218 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
56ef9c90
MRL		 2219 ret = vxlan_igmp_join(vxlan);
2220 if (ret) {
2221 vxlan_sock_release(vs);
2222 return ret;
2223 }
d342894c 2224 }
2225
2226 if (vxlan->age_interval)
2227 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2228
56ef9c90 2229 return ret;
d342894c 2230}
2231
2232/* Purge the forwarding table */
2233static void vxlan_flush(struct vxlan_dev *vxlan)
2234{
31fec5aa 2235 unsigned int h;
d342894c 2236
2237 spin_lock_bh(&vxlan->hash_lock);
2238 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2239 struct hlist_node *p, *n;
2240 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2241 struct vxlan_fdb *f
2242 = container_of(p, struct vxlan_fdb, hlist);
afbd8bae
MR		 2243 /* the all_zeros_mac entry is deleted at vxlan_uninit */
2244 if (!is_zero_ether_addr(f->eth_addr))
2245 vxlan_fdb_destroy(vxlan, f);
d342894c 2246 }
2247 }
2248 spin_unlock_bh(&vxlan->hash_lock);
2249}
2250
2251/* Cleanup timer and forwarding table on shutdown */
2252static int vxlan_stop(struct net_device *dev)
2253{
2254 struct vxlan_dev *vxlan = netdev_priv(dev);
f01ec1c0 2255 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
1c51a915 2256 struct vxlan_sock *vs = vxlan->vn_sock;
56ef9c90 2257 int ret = 0;
d342894c 2258
24c0e683 2259 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
95ab0991 2260 !vxlan_group_used(vn, vxlan)) {
56ef9c90
MRL		 2261 ret = vxlan_igmp_leave(vxlan);
2262 if (ret)
2263 return ret;
7c47cedf 2264 }
d342894c 2265
2266 del_timer_sync(&vxlan->age_timer);
2267
2268 vxlan_flush(vxlan);
56ef9c90 2269 vxlan_sock_release(vs);
d342894c 2270
56ef9c90 2271 return ret;
d342894c 2272}
2273
d342894c 2274/* Stub, nothing needs to be done. */
2275static void vxlan_set_multicast_list(struct net_device *dev)
2276{
2277}
2278
345010b5
DB		 2279static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2280{
2281 struct vxlan_dev *vxlan = netdev_priv(dev);
2282 struct vxlan_rdst *dst = &vxlan->default_dst;
2283 struct net_device *lowerdev;
2284 int max_mtu;
2285
f01ec1c0 2286 lowerdev = __dev_get_by_index(vxlan->net, dst->remote_ifindex);
345010b5
DB		 2287 if (lowerdev == NULL)
2288 return eth_change_mtu(dev, new_mtu);
2289
2290 if (dst->remote_ip.sa.sa_family == AF_INET6)
2291 max_mtu = lowerdev->mtu - VXLAN6_HEADROOM;
2292 else
2293 max_mtu = lowerdev->mtu - VXLAN_HEADROOM;
2294
2295 if (new_mtu < 68 || new_mtu > max_mtu)
2296 return -EINVAL;
2297
2298 dev->mtu = new_mtu;
2299 return 0;
2300}
2301
d342894c 2302static const struct net_device_ops vxlan_netdev_ops = {
2303 .ndo_init = vxlan_init,
ebf4063e 2304 .ndo_uninit = vxlan_uninit,
d342894c 2305 .ndo_open = vxlan_open,
2306 .ndo_stop = vxlan_stop,
2307 .ndo_start_xmit = vxlan_xmit,
e8171045 2308 .ndo_get_stats64 = ip_tunnel_get_stats64,
d342894c 2309 .ndo_set_rx_mode = vxlan_set_multicast_list,
345010b5 2310 .ndo_change_mtu = vxlan_change_mtu,
d342894c 2311 .ndo_validate_addr = eth_validate_addr,
2312 .ndo_set_mac_address = eth_mac_addr,
2313 .ndo_fdb_add = vxlan_fdb_add,
2314 .ndo_fdb_del = vxlan_fdb_delete,
2315 .ndo_fdb_dump = vxlan_fdb_dump,
2316};
2317
2318/* Info for udev, that this is a virtual tunnel endpoint */
2319static struct device_type vxlan_type = {
2320 .name = "vxlan",
2321};
2322
53cf5275 2323/* Calls the ndo_add_vxlan_port of the caller in order to
35e42379
JG		 2324 * supply the listening VXLAN udp ports. Callers are expected
2325 * to implement the ndo_add_vxlan_port.
53cf5275
JG		 2326 */
2327void vxlan_get_rx_port(struct net_device *dev)
2328{
2329 struct vxlan_sock *vs;
2330 struct net *net = dev_net(dev);
2331 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2332 sa_family_t sa_family;
35e42379
JG		 2333 __be16 port;
2334 unsigned int i;
53cf5275
JG		 2335
2336 spin_lock(&vn->sock_lock);
2337 for (i = 0; i < PORT_HASH_SIZE; ++i) {
35e42379
JG		 2338 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2339 port = inet_sk(vs->sock->sk)->inet_sport;
53cf5275
JG		 2340 sa_family = vs->sock->sk->sk_family;
2341 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
2342 port);
2343 }
2344 }
2345 spin_unlock(&vn->sock_lock);
2346}
2347EXPORT_SYMBOL_GPL(vxlan_get_rx_port);
2348
d342894c 2349/* Initialize the device structure. */
2350static void vxlan_setup(struct net_device *dev)
2351{
2352 struct vxlan_dev *vxlan = netdev_priv(dev);
31fec5aa 2353 unsigned int h;
d342894c 2354
2355 eth_hw_addr_random(dev);
2356 ether_setup(dev);
e4c7ed41 2357 if (vxlan->default_dst.remote_ip.sa.sa_family == AF_INET6)
2853af6a 2358 dev->needed_headroom = ETH_HLEN + VXLAN6_HEADROOM;
e4c7ed41 2359 else
2853af6a 2360 dev->needed_headroom = ETH_HLEN + VXLAN_HEADROOM;
d342894c 2361
2362 dev->netdev_ops = &vxlan_netdev_ops;
ebf4063e 2363 dev->destructor = free_netdev;
d342894c 2364 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2365
2366 dev->tx_queue_len = 0;
2367 dev->features |= NETIF_F_LLTX;
d6727fe3 2368 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
0afb1666 2369 dev->features |= NETIF_F_RXCSUM;
05c0db08 2370 dev->features |= NETIF_F_GSO_SOFTWARE;
0afb1666 2371
1eaa8178
PS		 2372 dev->vlan_features = dev->features;
2373 dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
0afb1666 2374 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
05c0db08 2375 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1eaa8178 2376 dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
02875878 2377 netif_keep_dst(dev);
6602d007 2378 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
d342894c 2379
553675fb 2380 INIT_LIST_HEAD(&vxlan->next);
d342894c 2381 spin_lock_init(&vxlan->hash_lock);
2382
2383 init_timer_deferrable(&vxlan->age_timer);
2384 vxlan->age_timer.function = vxlan_cleanup;
2385 vxlan->age_timer.data = (unsigned long) vxlan;
2386
823aa873 2387 vxlan->dst_port = htons(vxlan_port);
05f47d69 2388
d342894c 2389 vxlan->dev = dev;
2390
2391 for (h = 0; h < FDB_HASH_SIZE; ++h)
2392 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2393}
2394
2395static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2396 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
5d174dd8 2397 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
e4c7ed41 2398 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
d342894c 2399 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
2400 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
e4c7ed41 2401 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
d342894c 2402 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
2403 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
2404 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
2405 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
2406 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
05f47d69 2407 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
e4f67add
DS		 2408 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
2409 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
2410 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
2411 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
823aa873 2412 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
5c91ae08
TH		 2413 [IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 },
2414 [IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
2415 [IFLA_VXLAN_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
dfd8645e
TH		 2416 [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2417 [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
3511494c 2418 [IFLA_VXLAN_GBP] = { .type = NLA_FLAG, },
0ace2ca8 2419 [IFLA_VXLAN_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG },
d342894c 2420};
2421
2422static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2423{
2424 if (tb[IFLA_ADDRESS]) {
2425 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2426 pr_debug("invalid link address (not ethernet)\n");
2427 return -EINVAL;
2428 }
2429
2430 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2431 pr_debug("invalid all zero ethernet address\n");
2432 return -EADDRNOTAVAIL;
2433 }
2434 }
2435
2436 if (!data)
2437 return -EINVAL;
2438
2439 if (data[IFLA_VXLAN_ID]) {
2440 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2441 if (id >= VXLAN_VID_MASK)
2442 return -ERANGE;
2443 }
2444
05f47d69 2445 if (data[IFLA_VXLAN_PORT_RANGE]) {
2446 const struct ifla_vxlan_port_range *p
2447 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2448
2449 if (ntohs(p->high) < ntohs(p->low)) {
2450 pr_debug("port range %u .. %u not valid\n",
2451 ntohs(p->low), ntohs(p->high));
2452 return -EINVAL;
2453 }
2454 }
2455
d342894c 2456 return 0;
2457}
2458
1b13c97f
YB		 2459static void vxlan_get_drvinfo(struct net_device *netdev,
2460 struct ethtool_drvinfo *drvinfo)
2461{
2462 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2463 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2464}
2465
2466static const struct ethtool_ops vxlan_ethtool_ops = {
2467 .get_drvinfo = vxlan_get_drvinfo,
2468 .get_link = ethtool_op_get_link,
2469};
2470
553675fb 2471static void vxlan_del_work(struct work_struct *work)
2472{
2473 struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
acbf74a7 2474 udp_tunnel_sock_release(vs->sock);
553675fb 2475 kfree_rcu(vs, rcu);
2476}
2477
3ee64f39
TH		 2478static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2479 __be16 port, u32 flags)
553675fb 2480{
e4c7ed41 2481 struct socket *sock;
3ee64f39
TH		 2482 struct udp_port_cfg udp_conf;
2483 int err;
e4c7ed41 2484
3ee64f39 2485 memset(&udp_conf, 0, sizeof(udp_conf));
e4c7ed41 2486
3ee64f39
TH		 2487 if (ipv6) {
2488 udp_conf.family = AF_INET6;
3ee64f39 2489 udp_conf.use_udp6_rx_checksums =
3dc2b6a8 2490 !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
3ee64f39
TH		 2491 } else {
2492 udp_conf.family = AF_INET;
e4c7ed41 2493 }
e4c7ed41 2494
3ee64f39 2495 udp_conf.local_udp_port = port;
553675fb 2496
3ee64f39
TH		 2497 /* Open UDP socket */
2498 err = udp_sock_create(net, &udp_conf, &sock);
2499 if (err < 0)
2500 return ERR_PTR(err);
e4c7ed41 2501
39deb2c7 2502 return sock;
e4c7ed41
CW		 2503}
2504
2505/* Create new listen socket if needed */
2506static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port,
359a0ea9
TH		 2507 vxlan_rcv_t *rcv, void *data,
2508 u32 flags)
e4c7ed41
CW		 2509{
2510 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2511 struct vxlan_sock *vs;
2512 struct socket *sock;
e4c7ed41 2513 unsigned int h;
359a0ea9 2514 bool ipv6 = !!(flags & VXLAN_F_IPV6);
acbf74a7 2515 struct udp_tunnel_sock_cfg tunnel_cfg;
e4c7ed41 2516
dc01e7d3 2517 vs = kzalloc(sizeof(*vs), GFP_KERNEL);
e4c7ed41
CW		 2518 if (!vs)
2519 return ERR_PTR(-ENOMEM);
2520
2521 for (h = 0; h < VNI_HASH_SIZE; ++h)
2522 INIT_HLIST_HEAD(&vs->vni_list[h]);
2523
2524 INIT_WORK(&vs->del_work, vxlan_del_work);
2525
3ee64f39 2526 sock = vxlan_create_sock(net, ipv6, port, flags);
39deb2c7 2527 if (IS_ERR(sock)) {
56ef9c90
MRL		 2528 pr_info("Cannot bind port %d, err=%ld\n", ntohs(port),
2529 PTR_ERR(sock));
553675fb 2530 kfree(vs);
e50fddc8 2531 return ERR_CAST(sock);
553675fb 2532 }
e4c7ed41
CW		 2533
2534 vs->sock = sock;
9c2e24e1 2535 atomic_set(&vs->refcnt, 1);
5cfccc5a 2536 vs->rcv = rcv;
012a5729 2537 vs->data = data;
af33c1ad 2538 vs->flags = (flags & VXLAN_F_RCV_FLAGS);
553675fb 2539
dc01e7d3
OG		 2540 /* Initialize the vxlan udp offloads structure */
2541 vs->udp_offloads.port = port;
2542 vs->udp_offloads.callbacks.gro_receive = vxlan_gro_receive;
2543 vs->udp_offloads.callbacks.gro_complete = vxlan_gro_complete;
2544
9c2e24e1
PS		 2545 spin_lock(&vn->sock_lock);
2546 hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
dc01e7d3 2547 vxlan_notify_add_rx_port(vs);
9c2e24e1 2548 spin_unlock(&vn->sock_lock);
553675fb 2549
2550 /* Mark socket as an encapsulation socket. */
acbf74a7
AZ		 2551 tunnel_cfg.sk_user_data = vs;
2552 tunnel_cfg.encap_type = 1;
2553 tunnel_cfg.encap_rcv = vxlan_udp_encap_recv;
2554 tunnel_cfg.encap_destroy = NULL;
2555
2556 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
e4c7ed41 2557
9c2e24e1
PS		 2558 return vs;
2559}
2560
012a5729
PS		 2561struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port,
2562 vxlan_rcv_t *rcv, void *data,
359a0ea9 2563 bool no_share, u32 flags)
9c2e24e1
PS		 2564{
2565 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2566 struct vxlan_sock *vs;
19ca9fc1 2567 bool ipv6 = flags & VXLAN_F_IPV6;
9c2e24e1 2568
56ef9c90
MRL		 2569 if (!no_share) {
2570 spin_lock(&vn->sock_lock);
2571 vs = vxlan_find_sock(net, ipv6 ? AF_INET6 : AF_INET, port,
2572 flags);
2573 if (vs && vs->rcv == rcv) {
2574 if (!atomic_add_unless(&vs->refcnt, 1, 0))
2575 vs = ERR_PTR(-EBUSY);
2576 spin_unlock(&vn->sock_lock);
2577 return vs;
2578 }
2579 spin_unlock(&vn->sock_lock);
2580 }
9c2e24e1 2581
56ef9c90 2582 return vxlan_socket_create(net, port, rcv, data, flags);
553675fb 2583}
012a5729 2584EXPORT_SYMBOL_GPL(vxlan_sock_add);
553675fb 2585
33564bbb 2586static int vxlan_newlink(struct net *src_net, struct net_device *dev,
d342894c 2587 struct nlattr *tb[], struct nlattr *data[])
2588{
33564bbb 2589 struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
d342894c 2590 struct vxlan_dev *vxlan = netdev_priv(dev);
c7995c43 2591 struct vxlan_rdst *dst = &vxlan->default_dst;
d342894c 2592 __u32 vni;
2593 int err;
e4c7ed41 2594 bool use_ipv6 = false;
d342894c 2595
2596 if (!data[IFLA_VXLAN_ID])
2597 return -EINVAL;
2598
33564bbb 2599 vxlan->net = src_net;
f01ec1c0 2600
d342894c 2601 vni = nla_get_u32(data[IFLA_VXLAN_ID]);
c7995c43 2602 dst->remote_vni = vni;
d342894c 2603
5933a7bb
MR		 2604 /* Unless IPv6 is explicitly requested, assume IPv4 */
2605 dst->remote_ip.sa.sa_family = AF_INET;
e4c7ed41 2606 if (data[IFLA_VXLAN_GROUP]) {
67b61f6c 2607 dst->remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
e4c7ed41
CW		 2608 } else if (data[IFLA_VXLAN_GROUP6]) {
2609 if (!IS_ENABLED(CONFIG_IPV6))
2610 return -EPFNOSUPPORT;
2611
67b61f6c 2612 dst->remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
e4c7ed41
CW		 2613 dst->remote_ip.sa.sa_family = AF_INET6;
2614 use_ipv6 = true;
2615 }
d342894c 2616
e4c7ed41 2617 if (data[IFLA_VXLAN_LOCAL]) {
67b61f6c 2618 vxlan->saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
e4c7ed41
CW		 2619 vxlan->saddr.sa.sa_family = AF_INET;
2620 } else if (data[IFLA_VXLAN_LOCAL6]) {
2621 if (!IS_ENABLED(CONFIG_IPV6))
2622 return -EPFNOSUPPORT;
2623
2624 /* TODO: respect scope id */
67b61f6c 2625 vxlan->saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
e4c7ed41
CW		 2626 vxlan->saddr.sa.sa_family = AF_INET6;
2627 use_ipv6 = true;
2628 }
d342894c 2629
34e02aa1 2630 if (data[IFLA_VXLAN_LINK] &&
c7995c43 2631 (dst->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]))) {
34e02aa1 2632 struct net_device *lowerdev
33564bbb 2633 = __dev_get_by_index(src_net, dst->remote_ifindex);
34e02aa1 2634
2635 if (!lowerdev) {
c7995c43 2636 pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
34e02aa1 2637 return -ENODEV;
2638 }
d342894c 2639
e4c7ed41
CW		 2640#if IS_ENABLED(CONFIG_IPV6)
2641 if (use_ipv6) {
2642 struct inet6_dev *idev = __in6_dev_get(lowerdev);
2643 if (idev && idev->cnf.disable_ipv6) {
2644 pr_info("IPv6 is disabled via sysctl\n");
2645 return -EPERM;
2646 }
2647 vxlan->flags |= VXLAN_F_IPV6;
2648 }
2649#endif
2650
34e02aa1 2651 if (!tb[IFLA_MTU])
e4c7ed41 2652 dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
1ba56fb4 2653
2853af6a 2654 dev->needed_headroom = lowerdev->hard_header_len +
e4c7ed41 2655 (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
7bda701e 2656 } else if (use_ipv6)
2657 vxlan->flags |= VXLAN_F_IPV6;
d342894c 2658
2659 if (data[IFLA_VXLAN_TOS])
2660 vxlan->tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
2661
afb97186
VB		 2662 if (data[IFLA_VXLAN_TTL])
2663 vxlan->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
2664
d342894c 2665 if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
e4f67add 2666 vxlan->flags |= VXLAN_F_LEARN;
d342894c 2667
2668 if (data[IFLA_VXLAN_AGEING])
2669 vxlan->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
2670 else
2671 vxlan->age_interval = FDB_AGE_DEFAULT;
2672
e4f67add
DS		 2673 if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
2674 vxlan->flags |= VXLAN_F_PROXY;
2675
2676 if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
2677 vxlan->flags |= VXLAN_F_RSC;
2678
2679 if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
2680 vxlan->flags |= VXLAN_F_L2MISS;
2681
2682 if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
2683 vxlan->flags |= VXLAN_F_L3MISS;
2684
d342894c 2685 if (data[IFLA_VXLAN_LIMIT])
2686 vxlan->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
2687
05f47d69 2688 if (data[IFLA_VXLAN_PORT_RANGE]) {
2689 const struct ifla_vxlan_port_range *p
2690 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2691 vxlan->port_min = ntohs(p->low);
2692 vxlan->port_max = ntohs(p->high);
2693 }
2694
823aa873 2695 if (data[IFLA_VXLAN_PORT])
2696 vxlan->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
2697
359a0ea9
TH		 2698 if (data[IFLA_VXLAN_UDP_CSUM] && nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
2699 vxlan->flags |= VXLAN_F_UDP_CSUM;
2700
2701 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
2702 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
2703 vxlan->flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
2704
2705 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
2706 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
2707 vxlan->flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
2708
dfd8645e
TH		 2709 if (data[IFLA_VXLAN_REMCSUM_TX] &&
2710 nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
2711 vxlan->flags |= VXLAN_F_REMCSUM_TX;
2712
2713 if (data[IFLA_VXLAN_REMCSUM_RX] &&
2714 nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
2715 vxlan->flags |= VXLAN_F_REMCSUM_RX;
2716
3511494c
TG		 2717 if (data[IFLA_VXLAN_GBP])
2718 vxlan->flags |= VXLAN_F_GBP;
2719
0ace2ca8
TH		 2720 if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL])
2721 vxlan->flags |= VXLAN_F_REMCSUM_NOPARTIAL;
2722
33564bbb 2723 if (vxlan_find_vni(src_net, vni, use_ipv6 ? AF_INET6 : AF_INET,
ac5132d1 2724 vxlan->dst_port, vxlan->flags)) {
553675fb 2725 pr_info("duplicate VNI %u\n", vni);
2726 return -EEXIST;
2727 }
2728
7ad24ea4 2729 dev->ethtool_ops = &vxlan_ethtool_ops;
1b13c97f 2730
2936b6ab
SS		 2731 /* create an fdb entry for a valid default destination */
2732 if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2733 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2734 &vxlan->default_dst.remote_ip,
2735 NUD_REACHABLE|NUD_PERMANENT,
2736 NLM_F_EXCL|NLM_F_CREATE,
2737 vxlan->dst_port,
2738 vxlan->default_dst.remote_vni,
2739 vxlan->default_dst.remote_ifindex,
2740 NTF_SELF);
2741 if (err)
2742 return err;
2743 }
d342894c 2744
afbd8bae
MR		 2745 err = register_netdevice(dev);
2746 if (err) {
ba609e9b 2747 vxlan_fdb_delete_default(vxlan);
afbd8bae
MR		 2748 return err;
2749 }
2750
553675fb 2751 list_add(&vxlan->next, &vn->vxlan_list);
553675fb 2752
2753 return 0;
d342894c 2754}
2755
2756static void vxlan_dellink(struct net_device *dev, struct list_head *head)
2757{
2758 struct vxlan_dev *vxlan = netdev_priv(dev);
f01ec1c0 2759 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
d342894c 2760
fe5c3561 2761 spin_lock(&vn->sock_lock);
9c2e24e1
PS		 2762 if (!hlist_unhashed(&vxlan->hlist))
2763 hlist_del_rcu(&vxlan->hlist);
fe5c3561 2764 spin_unlock(&vn->sock_lock);
2765
553675fb 2766 list_del(&vxlan->next);
d342894c 2767 unregister_netdevice_queue(dev, head);
2768}
2769
2770static size_t vxlan_get_size(const struct net_device *dev)
2771{
2772
2773 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
e4c7ed41 2774 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
d342894c 2775 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
e4c7ed41 2776 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
d342894c 2777 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
2778 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
2779 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
e4f67add
DS		 2780 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
2781 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
2782 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
2783 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
d342894c 2784 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
2785 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
05f47d69 2786 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
359a0ea9
TH		 2787 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
2788 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
2789 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
2790 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
dfd8645e
TH		 2791 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
2792 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
d342894c 2793 0;
2794}
2795
2796static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
2797{
2798 const struct vxlan_dev *vxlan = netdev_priv(dev);
c7995c43 2799 const struct vxlan_rdst *dst = &vxlan->default_dst;
05f47d69 2800 struct ifla_vxlan_port_range ports = {
2801 .low = htons(vxlan->port_min),
2802 .high = htons(vxlan->port_max),
2803 };
d342894c 2804
c7995c43 2805 if (nla_put_u32(skb, IFLA_VXLAN_ID, dst->remote_vni))
d342894c 2806 goto nla_put_failure;
2807
e4c7ed41
CW		 2808 if (!vxlan_addr_any(&dst->remote_ip)) {
2809 if (dst->remote_ip.sa.sa_family == AF_INET) {
930345ea
JB		 2810 if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
2811 dst->remote_ip.sin.sin_addr.s_addr))
e4c7ed41
CW		 2812 goto nla_put_failure;
2813#if IS_ENABLED(CONFIG_IPV6)
2814 } else {
930345ea
JB		 2815 if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
2816 &dst->remote_ip.sin6.sin6_addr))
e4c7ed41
CW		 2817 goto nla_put_failure;
2818#endif
2819 }
2820 }
d342894c 2821
c7995c43 2822 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
d342894c 2823 goto nla_put_failure;
2824
e4c7ed41
CW		 2825 if (!vxlan_addr_any(&vxlan->saddr)) {
2826 if (vxlan->saddr.sa.sa_family == AF_INET) {
930345ea
JB		 2827 if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
2828 vxlan->saddr.sin.sin_addr.s_addr))
e4c7ed41
CW		 2829 goto nla_put_failure;
2830#if IS_ENABLED(CONFIG_IPV6)
2831 } else {
930345ea
JB		 2832 if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
2833 &vxlan->saddr.sin6.sin6_addr))
e4c7ed41
CW		 2834 goto nla_put_failure;
2835#endif
2836 }
2837 }
d342894c 2838
2839 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->ttl) ||
2840 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->tos) ||
e4f67add
DS		 2841 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
2842 !!(vxlan->flags & VXLAN_F_LEARN)) ||
2843 nla_put_u8(skb, IFLA_VXLAN_PROXY,
2844 !!(vxlan->flags & VXLAN_F_PROXY)) ||
2845 nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
2846 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
2847 !!(vxlan->flags & VXLAN_F_L2MISS)) ||
2848 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
2849 !!(vxlan->flags & VXLAN_F_L3MISS)) ||
d342894c 2850 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->age_interval) ||
823aa873 2851 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->addrmax) ||
359a0ea9
TH		 2852 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->dst_port) ||
2853 nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
2854 !!(vxlan->flags & VXLAN_F_UDP_CSUM)) ||
2855 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
2856 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
2857 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
dfd8645e
TH		 2858 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
2859 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
2860 !!(vxlan->flags & VXLAN_F_REMCSUM_TX)) ||
2861 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
2862 !!(vxlan->flags & VXLAN_F_REMCSUM_RX)))
d342894c 2863 goto nla_put_failure;
2864
05f47d69 2865 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
2866 goto nla_put_failure;
2867
3511494c
TG		 2868 if (vxlan->flags & VXLAN_F_GBP &&
2869 nla_put_flag(skb, IFLA_VXLAN_GBP))
2870 goto nla_put_failure;
2871
0ace2ca8
TH		 2872 if (vxlan->flags & VXLAN_F_REMCSUM_NOPARTIAL &&
2873 nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
2874 goto nla_put_failure;
2875
d342894c 2876 return 0;
2877
2878nla_put_failure:
2879 return -EMSGSIZE;
2880}
2881
1728d4fa
ND		 2882static struct net *vxlan_get_link_net(const struct net_device *dev)
2883{
2884 struct vxlan_dev *vxlan = netdev_priv(dev);
2885
2886 return vxlan->net;
2887}
2888
d342894c 2889static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
2890 .kind = "vxlan",
2891 .maxtype = IFLA_VXLAN_MAX,
2892 .policy = vxlan_policy,
2893 .priv_size = sizeof(struct vxlan_dev),
2894 .setup = vxlan_setup,
2895 .validate = vxlan_validate,
2896 .newlink = vxlan_newlink,
2897 .dellink = vxlan_dellink,
2898 .get_size = vxlan_get_size,
2899 .fill_info = vxlan_fill_info,
1728d4fa 2900 .get_link_net = vxlan_get_link_net,
d342894c 2901};
2902
acaf4e70
DB		 2903static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
2904 struct net_device *dev)
2905{
2906 struct vxlan_dev *vxlan, *next;
2907 LIST_HEAD(list_kill);
2908
2909 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
2910 struct vxlan_rdst *dst = &vxlan->default_dst;
2911
2912 /* In case we created vxlan device with carrier
2913 * and we loose the carrier due to module unload
2914 * we also need to remove vxlan device. In other
2915 * cases, it's not necessary and remote_ifindex
2916 * is 0 here, so no matches.
2917 */
2918 if (dst->remote_ifindex == dev->ifindex)
2919 vxlan_dellink(vxlan->dev, &list_kill);
2920 }
2921
2922 unregister_netdevice_many(&list_kill);
2923}
2924
2925static int vxlan_lowerdev_event(struct notifier_block *unused,
2926 unsigned long event, void *ptr)
2927{
2928 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
783c1463 2929 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
acaf4e70 2930
783c1463 2931 if (event == NETDEV_UNREGISTER)
acaf4e70
DB		 2932 vxlan_handle_lowerdev_unregister(vn, dev);
2933
2934 return NOTIFY_DONE;
2935}
2936
2937static struct notifier_block vxlan_notifier_block __read_mostly = {
2938 .notifier_call = vxlan_lowerdev_event,
2939};
2940
d342894c 2941static __net_init int vxlan_init_net(struct net *net)
2942{
2943 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
31fec5aa 2944 unsigned int h;
d342894c 2945
553675fb 2946 INIT_LIST_HEAD(&vn->vxlan_list);
1c51a915 2947 spin_lock_init(&vn->sock_lock);
d342894c 2948
553675fb 2949 for (h = 0; h < PORT_HASH_SIZE; ++h)
2950 INIT_HLIST_HEAD(&vn->sock_list[h]);
d342894c 2951
2952 return 0;
2953}
2954
f01ec1c0
ND		 2955static void __net_exit vxlan_exit_net(struct net *net)
2956{
2957 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2958 struct vxlan_dev *vxlan, *next;
2959 struct net_device *dev, *aux;
2960 LIST_HEAD(list);
2961
2962 rtnl_lock();
2963 for_each_netdev_safe(net, dev, aux)
2964 if (dev->rtnl_link_ops == &vxlan_link_ops)
2965 unregister_netdevice_queue(dev, &list);
2966
2967 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
2968 /* If vxlan->dev is in the same netns, it has already been added
2969 * to the list by the previous loop.
2970 */
2971 if (!net_eq(dev_net(vxlan->dev), net))
2972 unregister_netdevice_queue(dev, &list);
2973 }
2974
2975 unregister_netdevice_many(&list);
2976 rtnl_unlock();
2977}
2978
d342894c 2979static struct pernet_operations vxlan_net_ops = {
2980 .init = vxlan_init_net,
f01ec1c0 2981 .exit = vxlan_exit_net,
d342894c 2982 .id = &vxlan_net_id,
2983 .size = sizeof(struct vxlan_net),
2984};
2985
2986static int __init vxlan_init_module(void)
2987{
2988 int rc;
2989
758c57d1
SH		 2990 vxlan_wq = alloc_workqueue("vxlan", 0, 0);
2991 if (!vxlan_wq)
2992 return -ENOMEM;
2993
d342894c 2994 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
2995
783c1463 2996 rc = register_pernet_subsys(&vxlan_net_ops);
d342894c 2997 if (rc)
2998 goto out1;
2999
acaf4e70 3000 rc = register_netdevice_notifier(&vxlan_notifier_block);
d342894c 3001 if (rc)
3002 goto out2;
3003
acaf4e70
DB		 3004 rc = rtnl_link_register(&vxlan_link_ops);
3005 if (rc)
3006 goto out3;
d342894c 3007
acaf4e70
DB		 3008 return 0;
3009out3:
3010 unregister_netdevice_notifier(&vxlan_notifier_block);
d342894c 3011out2:
783c1463 3012 unregister_pernet_subsys(&vxlan_net_ops);
d342894c 3013out1:
758c57d1 3014 destroy_workqueue(vxlan_wq);
d342894c 3015 return rc;
3016}
7332a13b 3017late_initcall(vxlan_init_module);
d342894c 3018
3019static void __exit vxlan_cleanup_module(void)
3020{
b7153984 3021 rtnl_link_unregister(&vxlan_link_ops);
acaf4e70 3022 unregister_netdevice_notifier(&vxlan_notifier_block);
758c57d1 3023 destroy_workqueue(vxlan_wq);
783c1463
DB		 3024 unregister_pernet_subsys(&vxlan_net_ops);
3025 /* rcu_barrier() is called by netns */
d342894c 3026}
3027module_exit(vxlan_cleanup_module);
3028
3029MODULE_LICENSE("GPL");
3030MODULE_VERSION(VXLAN_VERSION);
3b8df3c6 3031MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
ead5139a 3032MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
d342894c 3033MODULE_ALIAS_RTNL_LINK("vxlan");
ubuntu-bionic-kernel mirror