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net/mlx5e: Prevent adding the same vxlan port
[linux-2.6-block.git] / drivers / net / vxlan.c
CommitLineData
d342894c 1/*
eb5ce439 2 * VXLAN: Virtual eXtensible Local Area Network
d342894c 3 *
3b8df3c6 4 * Copyright (c) 2012-2013 Vyatta Inc.
d342894c 5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
d342894c 9 */
10
11#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13#include <linux/kernel.h>
14#include <linux/types.h>
15#include <linux/module.h>
16#include <linux/errno.h>
17#include <linux/slab.h>
18#include <linux/skbuff.h>
19#include <linux/rculist.h>
20#include <linux/netdevice.h>
21#include <linux/in.h>
22#include <linux/ip.h>
23#include <linux/udp.h>
24#include <linux/igmp.h>
25#include <linux/etherdevice.h>
26#include <linux/if_ether.h>
1eaa8178 27#include <linux/if_vlan.h>
d342894c 28#include <linux/hash.h>
1b13c97f 29#include <linux/ethtool.h>
e4f67add
DS		 30#include <net/arp.h>
31#include <net/ndisc.h>
d342894c 32#include <net/ip.h>
c5441932 33#include <net/ip_tunnels.h>
d342894c 34#include <net/icmp.h>
35#include <net/udp.h>
3ee64f39 36#include <net/udp_tunnel.h>
d342894c 37#include <net/rtnetlink.h>
38#include <net/route.h>
39#include <net/dsfield.h>
40#include <net/inet_ecn.h>
41#include <net/net_namespace.h>
42#include <net/netns/generic.h>
012a5729 43#include <net/vxlan.h>
dc01e7d3 44#include <net/protocol.h>
40d29af0 45
e4c7ed41
CW		 46#if IS_ENABLED(CONFIG_IPV6)
47#include <net/ipv6.h>
48#include <net/addrconf.h>
49#include <net/ip6_tunnel.h>
660d98ca 50#include <net/ip6_checksum.h>
e4c7ed41 51#endif
ee122c79 52#include <net/dst_metadata.h>
d342894c 53
54#define VXLAN_VERSION "0.1"
55
553675fb 56#define PORT_HASH_BITS 8
57#define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
d342894c 58#define FDB_AGE_DEFAULT 300 /* 5 min */
59#define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
60
23c578bf 61/* UDP port for VXLAN traffic.
62 * The IANA assigned port is 4789, but the Linux default is 8472
234f5b73 63 * for compatibility with early adopters.
23c578bf 64 */
9daaa397
SH		 65static unsigned short vxlan_port __read_mostly = 8472;
66module_param_named(udp_port, vxlan_port, ushort, 0444);
d342894c 67MODULE_PARM_DESC(udp_port, "Destination UDP port");
68
69static bool log_ecn_error = true;
70module_param(log_ecn_error, bool, 0644);
71MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
72
60d9d4c6 73static int vxlan_net_id;
0dfbdf41 74static struct rtnl_link_ops vxlan_link_ops;
553675fb 75
7256eac1 76static const u8 all_zeros_mac[ETH_ALEN + 2];
afbd8bae 77
205f356d 78static int vxlan_sock_add(struct vxlan_dev *vxlan);
614732ea 79
553675fb 80/* per-network namespace private data for this module */
81struct vxlan_net {
82 struct list_head vxlan_list;
83 struct hlist_head sock_list[PORT_HASH_SIZE];
1c51a915 84 spinlock_t sock_lock;
553675fb 85};
86
d342894c 87/* Forwarding table entry */
88struct vxlan_fdb {
89 struct hlist_node hlist; /* linked list of entries */
90 struct rcu_head rcu;
91 unsigned long updated; /* jiffies */
92 unsigned long used;
3e61aa8f 93 struct list_head remotes;
7177a3b0 94 u8 eth_addr[ETH_ALEN];
d342894c 95 u16 state; /* see ndm_state */
ae884082 96 u8 flags; /* see ndm_flags */
d342894c 97};
98
d342894c 99/* salt for hash table */
100static u32 vxlan_salt __read_mostly;
101
ee122c79
TG		 102static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
103{
e7030878
TG		 104 return vs->flags & VXLAN_F_COLLECT_METADATA ||
105 ip_tunnel_collect_metadata();
ee122c79
TG		 106}
107
e4c7ed41
CW		 108#if IS_ENABLED(CONFIG_IPV6)
109static inline
110bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
111{
f0ef3126
JB		 112 if (a->sa.sa_family != b->sa.sa_family)
113 return false;
114 if (a->sa.sa_family == AF_INET6)
115 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
116 else
117 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
e4c7ed41
CW		 118}
119
120static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
121{
f0ef3126
JB		 122 if (ipa->sa.sa_family == AF_INET6)
123 return ipv6_addr_any(&ipa->sin6.sin6_addr);
124 else
125 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
e4c7ed41
CW		 126}
127
128static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
129{
f0ef3126
JB		 130 if (ipa->sa.sa_family == AF_INET6)
131 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
132 else
133 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
e4c7ed41
CW		 134}
135
136static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
137{
f0ef3126 138 if (nla_len(nla) >= sizeof(struct in6_addr)) {
67b61f6c 139 ip->sin6.sin6_addr = nla_get_in6_addr(nla);
f0ef3126
JB		 140 ip->sa.sa_family = AF_INET6;
141 return 0;
142 } else if (nla_len(nla) >= sizeof(__be32)) {
67b61f6c 143 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
f0ef3126
JB		 144 ip->sa.sa_family = AF_INET;
145 return 0;
146 } else {
147 return -EAFNOSUPPORT;
148 }
e4c7ed41
CW		 149}
150
151static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
f0ef3126 152 const union vxlan_addr *ip)
e4c7ed41 153{
f0ef3126 154 if (ip->sa.sa_family == AF_INET6)
930345ea 155 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
f0ef3126 156 else
930345ea 157 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
e4c7ed41
CW		 158}
159
160#else /* !CONFIG_IPV6 */
161
162static inline
163bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
164{
f0ef3126 165 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
e4c7ed41
CW		 166}
167
168static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
169{
f0ef3126 170 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
e4c7ed41
CW		 171}
172
173static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
174{
f0ef3126 175 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
e4c7ed41
CW		 176}
177
178static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
179{
f0ef3126
JB		 180 if (nla_len(nla) >= sizeof(struct in6_addr)) {
181 return -EAFNOSUPPORT;
182 } else if (nla_len(nla) >= sizeof(__be32)) {
67b61f6c 183 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
f0ef3126
JB		 184 ip->sa.sa_family = AF_INET;
185 return 0;
186 } else {
187 return -EAFNOSUPPORT;
188 }
e4c7ed41
CW		 189}
190
191static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
f0ef3126 192 const union vxlan_addr *ip)
e4c7ed41 193{
930345ea 194 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
e4c7ed41
CW		 195}
196#endif
197
553675fb 198/* Virtual Network hash table head */
54bfd872 199static inline struct hlist_head *vni_head(struct vxlan_sock *vs, __be32 vni)
553675fb 200{
54bfd872 201 return &vs->vni_list[hash_32((__force u32)vni, VNI_HASH_BITS)];
553675fb 202}
203
204/* Socket hash table head */
205static inline struct hlist_head *vs_head(struct net *net, __be16 port)
d342894c 206{
207 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
208
553675fb 209 return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
210}
211
3e61aa8f
SH		 212/* First remote destination for a forwarding entry.
213 * Guaranteed to be non-NULL because remotes are never deleted.
214 */
5ca5461c 215static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
3e61aa8f 216{
5ca5461c 217 return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
218}
219
220static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
221{
222 return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
3e61aa8f
SH		 223}
224
ac5132d1
TG		 225/* Find VXLAN socket based on network namespace, address family and UDP port
226 * and enabled unshareable flags.
227 */
228static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
229 __be16 port, u32 flags)
553675fb 230{
231 struct vxlan_sock *vs;
af33c1ad
TH		 232
233 flags &= VXLAN_F_RCV_FLAGS;
553675fb 234
235 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
19ca9fc1 236 if (inet_sk(vs->sock->sk)->inet_sport == port &&
705cc62f 237 vxlan_get_sk_family(vs) == family &&
af33c1ad 238 vs->flags == flags)
553675fb 239 return vs;
240 }
241 return NULL;
d342894c 242}
243
54bfd872 244static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, __be32 vni)
d342894c 245{
246 struct vxlan_dev *vxlan;
d342894c 247
b9167b2e
JB		 248 /* For flow based devices, map all packets to VNI 0 */
249 if (vs->flags & VXLAN_F_COLLECT_METADATA)
250 vni = 0;
251
54bfd872
JB		 252 hlist_for_each_entry_rcu(vxlan, vni_head(vs, vni), hlist) {
253 if (vxlan->default_dst.remote_vni == vni)
d342894c 254 return vxlan;
255 }
256
257 return NULL;
258}
259
5cfccc5a 260/* Look up VNI in a per net namespace table */
54bfd872 261static struct vxlan_dev *vxlan_find_vni(struct net *net, __be32 vni,
ac5132d1
TG		 262 sa_family_t family, __be16 port,
263 u32 flags)
5cfccc5a
PS		 264{
265 struct vxlan_sock *vs;
266
ac5132d1 267 vs = vxlan_find_sock(net, family, port, flags);
5cfccc5a
PS		 268 if (!vs)
269 return NULL;
270
54bfd872 271 return vxlan_vs_find_vni(vs, vni);
5cfccc5a
PS		 272}
273
d342894c 274/* Fill in neighbour message in skbuff. */
275static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
234f5b73
SH		 276 const struct vxlan_fdb *fdb,
277 u32 portid, u32 seq, int type, unsigned int flags,
278 const struct vxlan_rdst *rdst)
d342894c 279{
280 unsigned long now = jiffies;
281 struct nda_cacheinfo ci;
282 struct nlmsghdr *nlh;
283 struct ndmsg *ndm;
e4f67add 284 bool send_ip, send_eth;
d342894c 285
286 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
287 if (nlh == NULL)
288 return -EMSGSIZE;
289
290 ndm = nlmsg_data(nlh);
291 memset(ndm, 0, sizeof(*ndm));
e4f67add
DS		 292
293 send_eth = send_ip = true;
294
295 if (type == RTM_GETNEIGH) {
296 ndm->ndm_family = AF_INET;
e4c7ed41 297 send_ip = !vxlan_addr_any(&rdst->remote_ip);
e4f67add
DS		 298 send_eth = !is_zero_ether_addr(fdb->eth_addr);
299 } else
300 ndm->ndm_family = AF_BRIDGE;
d342894c 301 ndm->ndm_state = fdb->state;
302 ndm->ndm_ifindex = vxlan->dev->ifindex;
ae884082 303 ndm->ndm_flags = fdb->flags;
545469f7 304 ndm->ndm_type = RTN_UNICAST;
d342894c 305
193523bf 306 if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
4967082b 307 nla_put_s32(skb, NDA_LINK_NETNSID,
7a0877d4 308 peernet2id_alloc(dev_net(vxlan->dev), vxlan->net)))
193523bf
ND		 309 goto nla_put_failure;
310
e4f67add 311 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
d342894c 312 goto nla_put_failure;
313
e4c7ed41 314 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
6681712d
DS		 315 goto nla_put_failure;
316
0dfbdf41 317 if (rdst->remote_port && rdst->remote_port != vxlan->cfg.dst_port &&
6681712d
DS		 318 nla_put_be16(skb, NDA_PORT, rdst->remote_port))
319 goto nla_put_failure;
c7995c43 320 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
54bfd872 321 nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni)))
6681712d
DS		 322 goto nla_put_failure;
323 if (rdst->remote_ifindex &&
324 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
d342894c 325 goto nla_put_failure;
326
327 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
328 ci.ndm_confirmed = 0;
329 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
330 ci.ndm_refcnt = 0;
331
332 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
333 goto nla_put_failure;
334
053c095a
JB		 335 nlmsg_end(skb, nlh);
336 return 0;
d342894c 337
338nla_put_failure:
339 nlmsg_cancel(skb, nlh);
340 return -EMSGSIZE;
341}
342
343static inline size_t vxlan_nlmsg_size(void)
344{
345 return NLMSG_ALIGN(sizeof(struct ndmsg))
346 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
e4c7ed41 347 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
73cf3317 348 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
6681712d
DS		 349 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
350 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
4967082b 351 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
d342894c 352 + nla_total_size(sizeof(struct nda_cacheinfo));
353}
354
9e4b93f9
ND		 355static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
356 struct vxlan_rdst *rd, int type)
d342894c 357{
358 struct net *net = dev_net(vxlan->dev);
359 struct sk_buff *skb;
360 int err = -ENOBUFS;
361
362 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
363 if (skb == NULL)
364 goto errout;
365
9e4b93f9 366 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
d342894c 367 if (err < 0) {
368 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
369 WARN_ON(err == -EMSGSIZE);
370 kfree_skb(skb);
371 goto errout;
372 }
373
374 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
375 return;
376errout:
377 if (err < 0)
378 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
379}
380
e4c7ed41 381static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
e4f67add
DS		 382{
383 struct vxlan_dev *vxlan = netdev_priv(dev);
bb3fd687
SH		 384 struct vxlan_fdb f = {
385 .state = NUD_STALE,
386 };
387 struct vxlan_rdst remote = {
e4c7ed41 388 .remote_ip = *ipa, /* goes to NDA_DST */
54bfd872 389 .remote_vni = cpu_to_be32(VXLAN_N_VID),
bb3fd687 390 };
3e61aa8f 391
9e4b93f9 392 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
e4f67add
DS		 393}
394
395static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
396{
bb3fd687
SH		 397 struct vxlan_fdb f = {
398 .state = NUD_STALE,
399 };
9e4b93f9 400 struct vxlan_rdst remote = { };
e4f67add 401
e4f67add
DS		 402 memcpy(f.eth_addr, eth_addr, ETH_ALEN);
403
9e4b93f9 404 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
e4f67add
DS		 405}
406
d342894c 407/* Hash Ethernet address */
408static u32 eth_hash(const unsigned char *addr)
409{
410 u64 value = get_unaligned((u64 *)addr);
411
412 /* only want 6 bytes */
413#ifdef __BIG_ENDIAN
d342894c 414 value >>= 16;
321fb991 415#else
416 value <<= 16;
d342894c 417#endif
418 return hash_64(value, FDB_HASH_BITS);
419}
420
421/* Hash chain to use given mac address */
422static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
423 const u8 *mac)
424{
425 return &vxlan->fdb_head[eth_hash(mac)];
426}
427
428/* Look up Ethernet address in forwarding table */
014be2c8 429static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
d342894c 430 const u8 *mac)
d342894c 431{
432 struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
433 struct vxlan_fdb *f;
d342894c 434
b67bfe0d 435 hlist_for_each_entry_rcu(f, head, hlist) {
7367d0b5 436 if (ether_addr_equal(mac, f->eth_addr))
d342894c 437 return f;
438 }
439
440 return NULL;
441}
442
014be2c8
SS		 443static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
444 const u8 *mac)
445{
446 struct vxlan_fdb *f;
447
448 f = __vxlan_find_mac(vxlan, mac);
449 if (f)
450 f->used = jiffies;
451
452 return f;
453}
454
a5e7c10a
MR		 455/* caller should hold vxlan->hash_lock */
456static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
e4c7ed41 457 union vxlan_addr *ip, __be16 port,
54bfd872 458 __be32 vni, __u32 ifindex)
6681712d 459{
3e61aa8f 460 struct vxlan_rdst *rd;
6681712d 461
3e61aa8f 462 list_for_each_entry(rd, &f->remotes, list) {
e4c7ed41 463 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
6681712d
DS		 464 rd->remote_port == port &&
465 rd->remote_vni == vni &&
466 rd->remote_ifindex == ifindex)
a5e7c10a 467 return rd;
6681712d 468 }
3e61aa8f 469
a5e7c10a
MR		 470 return NULL;
471}
472
906dc186
TR		 473/* Replace destination of unicast mac */
474static int vxlan_fdb_replace(struct vxlan_fdb *f,
54bfd872
JB		 475 union vxlan_addr *ip, __be16 port, __be32 vni,
476 __u32 ifindex)
906dc186
TR		 477{
478 struct vxlan_rdst *rd;
479
480 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
481 if (rd)
482 return 0;
483
484 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
485 if (!rd)
486 return 0;
0c1d70af
PA		 487
488 dst_cache_reset(&rd->dst_cache);
e4c7ed41 489 rd->remote_ip = *ip;
906dc186
TR		 490 rd->remote_port = port;
491 rd->remote_vni = vni;
492 rd->remote_ifindex = ifindex;
493 return 1;
494}
495
a5e7c10a
MR		 496/* Add/update destinations for multicast */
497static int vxlan_fdb_append(struct vxlan_fdb *f,
54bfd872 498 union vxlan_addr *ip, __be16 port, __be32 vni,
9e4b93f9 499 __u32 ifindex, struct vxlan_rdst **rdp)
a5e7c10a
MR		 500{
501 struct vxlan_rdst *rd;
502
503 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
504 if (rd)
505 return 0;
506
6681712d
DS		 507 rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
508 if (rd == NULL)
509 return -ENOBUFS;
0c1d70af
PA		 510
511 if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) {
512 kfree(rd);
513 return -ENOBUFS;
514 }
515
e4c7ed41 516 rd->remote_ip = *ip;
6681712d
DS		 517 rd->remote_port = port;
518 rd->remote_vni = vni;
519 rd->remote_ifindex = ifindex;
3e61aa8f
SH		 520
521 list_add_tail_rcu(&rd->list, &f->remotes);
522
9e4b93f9 523 *rdp = rd;
6681712d
DS		 524 return 1;
525}
526
dfd8645e
TH		 527static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
528 unsigned int off,
529 struct vxlanhdr *vh, size_t hdrlen,
54bfd872
JB		 530 __be32 vni_field,
531 struct gro_remcsum *grc,
0ace2ca8 532 bool nopartial)
dfd8645e 533{
b7fe10e5 534 size_t start, offset;
dfd8645e
TH		 535
536 if (skb->remcsum_offload)
b7fe10e5 537 return vh;
dfd8645e
TH		 538
539 if (!NAPI_GRO_CB(skb)->csum_valid)
540 return NULL;
541
54bfd872
JB		 542 start = vxlan_rco_start(vni_field);
543 offset = start + vxlan_rco_offset(vni_field);
dfd8645e 544
b7fe10e5
TH		 545 vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
546 start, offset, grc, nopartial);
dfd8645e
TH		 547
548 skb->remcsum_offload = 1;
549
550 return vh;
551}
552
5602c48c
TH		 553static struct sk_buff **vxlan_gro_receive(struct sock *sk,
554 struct sk_buff **head,
555 struct sk_buff *skb)
dc01e7d3
OG		 556{
557 struct sk_buff *p, **pp = NULL;
558 struct vxlanhdr *vh, *vh2;
9b174d88 559 unsigned int hlen, off_vx;
dc01e7d3 560 int flush = 1;
5602c48c 561 struct vxlan_sock *vs = rcu_dereference_sk_user_data(sk);
54bfd872 562 __be32 flags;
26c4f7da
TH		 563 struct gro_remcsum grc;
564
565 skb_gro_remcsum_init(&grc);
dc01e7d3
OG		 566
567 off_vx = skb_gro_offset(skb);
568 hlen = off_vx + sizeof(*vh);
569 vh = skb_gro_header_fast(skb, off_vx);
570 if (skb_gro_header_hard(skb, hlen)) {
571 vh = skb_gro_header_slow(skb, hlen, off_vx);
572 if (unlikely(!vh))
573 goto out;
574 }
dc01e7d3 575
dfd8645e
TH		 576 skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
577
54bfd872 578 flags = vh->vx_flags;
dfd8645e
TH		 579
580 if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
581 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
54bfd872 582 vh->vx_vni, &grc,
0ace2ca8
TH		 583 !!(vs->flags &
584 VXLAN_F_REMCSUM_NOPARTIAL));
dfd8645e
TH		 585
586 if (!vh)
587 goto out;
588 }
589
b7fe10e5
TH		 590 skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
591
dc01e7d3
OG		 592 for (p = *head; p; p = p->next) {
593 if (!NAPI_GRO_CB(p)->same_flow)
594 continue;
595
596 vh2 = (struct vxlanhdr *)(p->data + off_vx);
3511494c
TG		 597 if (vh->vx_flags != vh2->vx_flags ||
598 vh->vx_vni != vh2->vx_vni) {
dc01e7d3
OG		 599 NAPI_GRO_CB(p)->same_flow = 0;
600 continue;
601 }
dc01e7d3
OG		 602 }
603
9b174d88 604 pp = eth_gro_receive(head, skb);
c194cf93 605 flush = 0;
dc01e7d3 606
dc01e7d3 607out:
26c4f7da 608 skb_gro_remcsum_cleanup(skb, &grc);
dc01e7d3
OG		 609 NAPI_GRO_CB(skb)->flush |= flush;
610
611 return pp;
612}
613
5602c48c 614static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
dc01e7d3 615{
229740c6
JR		 616 /* Sets 'skb->inner_mac_header' since we are always called with
617 * 'skb->encapsulation' set.
618 */
9b174d88 619 return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
dc01e7d3
OG		 620}
621
53cf5275 622/* Notify netdevs that UDP port started listening */
dc01e7d3 623static void vxlan_notify_add_rx_port(struct vxlan_sock *vs)
53cf5275
JG		 624{
625 struct net_device *dev;
dc01e7d3 626 struct sock *sk = vs->sock->sk;
53cf5275 627 struct net *net = sock_net(sk);
705cc62f 628 sa_family_t sa_family = vxlan_get_sk_family(vs);
35e42379 629 __be16 port = inet_sk(sk)->inet_sport;
53cf5275
JG		 630
631 rcu_read_lock();
632 for_each_netdev_rcu(net, dev) {
633 if (dev->netdev_ops->ndo_add_vxlan_port)
634 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
635 port);
636 }
637 rcu_read_unlock();
638}
639
640/* Notify netdevs that UDP port is no more listening */
dc01e7d3 641static void vxlan_notify_del_rx_port(struct vxlan_sock *vs)
53cf5275
JG		 642{
643 struct net_device *dev;
dc01e7d3 644 struct sock *sk = vs->sock->sk;
53cf5275 645 struct net *net = sock_net(sk);
705cc62f 646 sa_family_t sa_family = vxlan_get_sk_family(vs);
35e42379 647 __be16 port = inet_sk(sk)->inet_sport;
53cf5275
JG		 648
649 rcu_read_lock();
650 for_each_netdev_rcu(net, dev) {
651 if (dev->netdev_ops->ndo_del_vxlan_port)
652 dev->netdev_ops->ndo_del_vxlan_port(dev, sa_family,
653 port);
654 }
655 rcu_read_unlock();
656}
657
d342894c 658/* Add new entry to forwarding table -- assumes lock held */
659static int vxlan_fdb_create(struct vxlan_dev *vxlan,
e4c7ed41 660 const u8 *mac, union vxlan_addr *ip,
6681712d 661 __u16 state, __u16 flags,
54bfd872 662 __be16 port, __be32 vni, __u32 ifindex,
ae884082 663 __u8 ndm_flags)
d342894c 664{
9e4b93f9 665 struct vxlan_rdst *rd = NULL;
d342894c 666 struct vxlan_fdb *f;
667 int notify = 0;
668
014be2c8 669 f = __vxlan_find_mac(vxlan, mac);
d342894c 670 if (f) {
671 if (flags & NLM_F_EXCL) {
672 netdev_dbg(vxlan->dev,
673 "lost race to create %pM\n", mac);
674 return -EEXIST;
675 }
676 if (f->state != state) {
677 f->state = state;
678 f->updated = jiffies;
679 notify = 1;
680 }
ae884082
DS		 681 if (f->flags != ndm_flags) {
682 f->flags = ndm_flags;
683 f->updated = jiffies;
684 notify = 1;
685 }
906dc186
TR		 686 if ((flags & NLM_F_REPLACE)) {
687 /* Only change unicasts */
688 if (!(is_multicast_ether_addr(f->eth_addr) ||
689 is_zero_ether_addr(f->eth_addr))) {
60840429 690 notify |= vxlan_fdb_replace(f, ip, port, vni,
906dc186 691 ifindex);
906dc186
TR		 692 } else
693 return -EOPNOTSUPP;
694 }
6681712d 695 if ((flags & NLM_F_APPEND) &&
58e4c767
MR		 696 (is_multicast_ether_addr(f->eth_addr) ||
697 is_zero_ether_addr(f->eth_addr))) {
9e4b93f9
ND		 698 int rc = vxlan_fdb_append(f, ip, port, vni, ifindex,
699 &rd);
6681712d
DS		 700
701 if (rc < 0)
702 return rc;
703 notify |= rc;
704 }
d342894c 705 } else {
706 if (!(flags & NLM_F_CREATE))
707 return -ENOENT;
708
0dfbdf41
TG		 709 if (vxlan->cfg.addrmax &&
710 vxlan->addrcnt >= vxlan->cfg.addrmax)
d342894c 711 return -ENOSPC;
712
906dc186
TR		 713 /* Disallow replace to add a multicast entry */
714 if ((flags & NLM_F_REPLACE) &&
715 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
716 return -EOPNOTSUPP;
717
e4c7ed41 718 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
d342894c 719 f = kmalloc(sizeof(*f), GFP_ATOMIC);
720 if (!f)
721 return -ENOMEM;
722
723 notify = 1;
d342894c 724 f->state = state;
ae884082 725 f->flags = ndm_flags;
d342894c 726 f->updated = f->used = jiffies;
3e61aa8f 727 INIT_LIST_HEAD(&f->remotes);
d342894c 728 memcpy(f->eth_addr, mac, ETH_ALEN);
729
9e4b93f9 730 vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
3e61aa8f 731
d342894c 732 ++vxlan->addrcnt;
733 hlist_add_head_rcu(&f->hlist,
734 vxlan_fdb_head(vxlan, mac));
735 }
736
9e4b93f9
ND		 737 if (notify) {
738 if (rd == NULL)
739 rd = first_remote_rtnl(f);
740 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
741 }
d342894c 742
743 return 0;
744}
745
6706c82e 746static void vxlan_fdb_free(struct rcu_head *head)
6681712d
DS		 747{
748 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
3e61aa8f 749 struct vxlan_rdst *rd, *nd;
6681712d 750
0c1d70af
PA		 751 list_for_each_entry_safe(rd, nd, &f->remotes, list) {
752 dst_cache_destroy(&rd->dst_cache);
6681712d 753 kfree(rd);
0c1d70af 754 }
6681712d
DS		 755 kfree(f);
756}
757
d342894c 758static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
759{
760 netdev_dbg(vxlan->dev,
761 "delete %pM\n", f->eth_addr);
762
763 --vxlan->addrcnt;
9e4b93f9 764 vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
d342894c 765
766 hlist_del_rcu(&f->hlist);
6681712d 767 call_rcu(&f->rcu, vxlan_fdb_free);
d342894c 768}
769
f0b074be 770static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
54bfd872
JB		 771 union vxlan_addr *ip, __be16 *port, __be32 *vni,
772 u32 *ifindex)
d342894c 773{
6681712d 774 struct net *net = dev_net(vxlan->dev);
e4c7ed41 775 int err;
d342894c 776
f0b074be 777 if (tb[NDA_DST]) {
e4c7ed41
CW		 778 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
779 if (err)
780 return err;
f0b074be 781 } else {
e4c7ed41
CW		 782 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
783 if (remote->sa.sa_family == AF_INET) {
784 ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
785 ip->sa.sa_family = AF_INET;
786#if IS_ENABLED(CONFIG_IPV6)
787 } else {
788 ip->sin6.sin6_addr = in6addr_any;
789 ip->sa.sa_family = AF_INET6;
790#endif
791 }
f0b074be 792 }
d342894c 793
6681712d 794 if (tb[NDA_PORT]) {
73cf3317 795 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
6681712d 796 return -EINVAL;
f0b074be
MR		 797 *port = nla_get_be16(tb[NDA_PORT]);
798 } else {
0dfbdf41 799 *port = vxlan->cfg.dst_port;
f0b074be 800 }
6681712d
DS		 801
802 if (tb[NDA_VNI]) {
803 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
804 return -EINVAL;
54bfd872 805 *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
f0b074be
MR		 806 } else {
807 *vni = vxlan->default_dst.remote_vni;
808 }
6681712d
DS		 809
810 if (tb[NDA_IFINDEX]) {
5abb0029 811 struct net_device *tdev;
6681712d
DS		 812
813 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
814 return -EINVAL;
f0b074be 815 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
73763949 816 tdev = __dev_get_by_index(net, *ifindex);
5abb0029 817 if (!tdev)
6681712d 818 return -EADDRNOTAVAIL;
f0b074be
MR		 819 } else {
820 *ifindex = 0;
821 }
822
823 return 0;
824}
825
826/* Add static entry (via netlink) */
827static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
828 struct net_device *dev,
f6f6424b 829 const unsigned char *addr, u16 vid, u16 flags)
f0b074be
MR		 830{
831 struct vxlan_dev *vxlan = netdev_priv(dev);
832 /* struct net *net = dev_net(vxlan->dev); */
e4c7ed41 833 union vxlan_addr ip;
f0b074be 834 __be16 port;
54bfd872
JB		 835 __be32 vni;
836 u32 ifindex;
f0b074be
MR		 837 int err;
838
839 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
840 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
841 ndm->ndm_state);
842 return -EINVAL;
843 }
844
845 if (tb[NDA_DST] == NULL)
846 return -EINVAL;
847
848 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
849 if (err)
850 return err;
6681712d 851
5933a7bb
MR		 852 if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
853 return -EAFNOSUPPORT;
854
d342894c 855 spin_lock_bh(&vxlan->hash_lock);
e4c7ed41 856 err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
73cf3317 857 port, vni, ifindex, ndm->ndm_flags);
d342894c 858 spin_unlock_bh(&vxlan->hash_lock);
859
860 return err;
861}
862
863/* Delete entry (via netlink) */
1690be63
VY		 864static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
865 struct net_device *dev,
f6f6424b 866 const unsigned char *addr, u16 vid)
d342894c 867{
868 struct vxlan_dev *vxlan = netdev_priv(dev);
869 struct vxlan_fdb *f;
bc7892ba 870 struct vxlan_rdst *rd = NULL;
e4c7ed41 871 union vxlan_addr ip;
bc7892ba 872 __be16 port;
54bfd872
JB		 873 __be32 vni;
874 u32 ifindex;
bc7892ba
MR		 875 int err;
876
877 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
878 if (err)
879 return err;
880
881 err = -ENOENT;
d342894c 882
883 spin_lock_bh(&vxlan->hash_lock);
884 f = vxlan_find_mac(vxlan, addr);
bc7892ba
MR		 885 if (!f)
886 goto out;
887
e4c7ed41
CW		 888 if (!vxlan_addr_any(&ip)) {
889 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
bc7892ba
MR		 890 if (!rd)
891 goto out;
892 }
893
894 err = 0;
895
896 /* remove a destination if it's not the only one on the list,
897 * otherwise destroy the fdb entry
898 */
899 if (rd && !list_is_singular(&f->remotes)) {
900 list_del_rcu(&rd->list);
9e4b93f9 901 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
dcdc7a59 902 kfree_rcu(rd, rcu);
bc7892ba 903 goto out;
d342894c 904 }
bc7892ba
MR		 905
906 vxlan_fdb_destroy(vxlan, f);
907
908out:
d342894c 909 spin_unlock_bh(&vxlan->hash_lock);
910
911 return err;
912}
913
914/* Dump forwarding table */
915static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
5d5eacb3
JHS		 916 struct net_device *dev,
917 struct net_device *filter_dev, int idx)
d342894c 918{
919 struct vxlan_dev *vxlan = netdev_priv(dev);
920 unsigned int h;
921
922 for (h = 0; h < FDB_HASH_SIZE; ++h) {
923 struct vxlan_fdb *f;
d342894c 924 int err;
925
b67bfe0d 926 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
6681712d 927 struct vxlan_rdst *rd;
6681712d 928
3e61aa8f 929 list_for_each_entry_rcu(rd, &f->remotes, list) {
07a51cd3
AW		 930 if (idx < cb->args[0])
931 goto skip;
932
6681712d
DS		 933 err = vxlan_fdb_info(skb, vxlan, f,
934 NETLINK_CB(cb->skb).portid,
935 cb->nlh->nlmsg_seq,
936 RTM_NEWNEIGH,
937 NLM_F_MULTI, rd);
472681d5
MM		 938 if (err < 0) {
939 cb->args[1] = err;
3e61aa8f 940 goto out;
472681d5 941 }
3e61aa8f 942skip:
07a51cd3
AW		 943 ++idx;
944 }
d342894c 945 }
946 }
3e61aa8f 947out:
d342894c 948 return idx;
949}
950
951/* Watch incoming packets to learn mapping between Ethernet address
952 * and Tunnel endpoint.
c4b49512 953 * Return true if packet is bogus and should be dropped.
d342894c 954 */
26a41ae6 955static bool vxlan_snoop(struct net_device *dev,
e4c7ed41 956 union vxlan_addr *src_ip, const u8 *src_mac)
d342894c 957{
958 struct vxlan_dev *vxlan = netdev_priv(dev);
959 struct vxlan_fdb *f;
d342894c 960
961 f = vxlan_find_mac(vxlan, src_mac);
962 if (likely(f)) {
5ca5461c 963 struct vxlan_rdst *rdst = first_remote_rcu(f);
3e61aa8f 964
e4c7ed41 965 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
26a41ae6 966 return false;
967
968 /* Don't migrate static entries, drop packets */
eb064c3b 969 if (f->state & NUD_NOARP)
26a41ae6 970 return true;
d342894c 971
972 if (net_ratelimit())
973 netdev_info(dev,
e4c7ed41 974 "%pM migrated from %pIS to %pIS\n",
a4870f79 975 src_mac, &rdst->remote_ip.sa, &src_ip->sa);
d342894c 976
e4c7ed41 977 rdst->remote_ip = *src_ip;
d342894c 978 f->updated = jiffies;
9e4b93f9 979 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
d342894c 980 } else {
981 /* learned new entry */
982 spin_lock(&vxlan->hash_lock);
3bf74b1a 983
984 /* close off race between vxlan_flush and incoming packets */
985 if (netif_running(dev))
986 vxlan_fdb_create(vxlan, src_mac, src_ip,
987 NUD_REACHABLE,
988 NLM_F_EXCL|NLM_F_CREATE,
0dfbdf41 989 vxlan->cfg.dst_port,
3bf74b1a 990 vxlan->default_dst.remote_vni,
991 0, NTF_SELF);
d342894c 992 spin_unlock(&vxlan->hash_lock);
993 }
26a41ae6 994
995 return false;
d342894c 996}
997
d342894c 998/* See if multicast group is already in use by other ID */
95ab0991 999static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
d342894c 1000{
553675fb 1001 struct vxlan_dev *vxlan;
b1be00a6 1002 unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
d342894c 1003
95ab0991
G		 1004 /* The vxlan_sock is only used by dev, leaving group has
1005 * no effect on other vxlan devices.
1006 */
b1be00a6
JB		 1007 if (family == AF_INET && dev->vn4_sock &&
1008 atomic_read(&dev->vn4_sock->refcnt) == 1)
95ab0991 1009 return false;
b1be00a6
JB		 1010#if IS_ENABLED(CONFIG_IPV6)
1011 if (family == AF_INET6 && dev->vn6_sock &&
1012 atomic_read(&dev->vn6_sock->refcnt) == 1)
1013 return false;
1014#endif
95ab0991 1015
553675fb 1016 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
95ab0991 1017 if (!netif_running(vxlan->dev) || vxlan == dev)
553675fb 1018 continue;
d342894c 1019
b1be00a6 1020 if (family == AF_INET && vxlan->vn4_sock != dev->vn4_sock)
95ab0991 1021 continue;
b1be00a6
JB		 1022#if IS_ENABLED(CONFIG_IPV6)
1023 if (family == AF_INET6 && vxlan->vn6_sock != dev->vn6_sock)
1024 continue;
1025#endif
95ab0991
G		 1026
1027 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1028 &dev->default_dst.remote_ip))
1029 continue;
1030
1031 if (vxlan->default_dst.remote_ifindex !=
1032 dev->default_dst.remote_ifindex)
1033 continue;
1034
1035 return true;
553675fb 1036 }
d342894c 1037
1038 return false;
1039}
1040
544a773a 1041static bool __vxlan_sock_release_prep(struct vxlan_sock *vs)
7c47cedf 1042{
b1be00a6 1043 struct vxlan_net *vn;
012a5729 1044
b1be00a6 1045 if (!vs)
544a773a 1046 return false;
7c47cedf 1047 if (!atomic_dec_and_test(&vs->refcnt))
544a773a 1048 return false;
d342894c 1049
b1be00a6 1050 vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1c51a915 1051 spin_lock(&vn->sock_lock);
7c47cedf 1052 hlist_del_rcu(&vs->hlist);
dc01e7d3 1053 vxlan_notify_del_rx_port(vs);
1c51a915
SH		 1054 spin_unlock(&vn->sock_lock);
1055
544a773a 1056 return true;
d342894c 1057}
1058
b1be00a6
JB		 1059static void vxlan_sock_release(struct vxlan_dev *vxlan)
1060{
544a773a 1061 bool ipv4 = __vxlan_sock_release_prep(vxlan->vn4_sock);
b1be00a6 1062#if IS_ENABLED(CONFIG_IPV6)
544a773a
HFS		 1063 bool ipv6 = __vxlan_sock_release_prep(vxlan->vn6_sock);
1064#endif
1065
1066 synchronize_net();
1067
1068 if (ipv4) {
1069 udp_tunnel_sock_release(vxlan->vn4_sock->sock);
1070 kfree(vxlan->vn4_sock);
1071 }
1072
1073#if IS_ENABLED(CONFIG_IPV6)
1074 if (ipv6) {
1075 udp_tunnel_sock_release(vxlan->vn6_sock->sock);
1076 kfree(vxlan->vn6_sock);
1077 }
b1be00a6
JB		 1078#endif
1079}
1080
56ef9c90 1081/* Update multicast group membership when first VNI on
c4b49512 1082 * multicast address is brought up
7c47cedf 1083 */
56ef9c90 1084static int vxlan_igmp_join(struct vxlan_dev *vxlan)
d342894c 1085{
b1be00a6 1086 struct sock *sk;
e4c7ed41
CW		 1087 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1088 int ifindex = vxlan->default_dst.remote_ifindex;
149d7549 1089 int ret = -EINVAL;
d342894c 1090
e4c7ed41
CW		 1091 if (ip->sa.sa_family == AF_INET) {
1092 struct ip_mreqn mreq = {
1093 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1094 .imr_ifindex = ifindex,
1095 };
1096
b1be00a6
JB		 1097 sk = vxlan->vn4_sock->sock->sk;
1098 lock_sock(sk);
56ef9c90 1099 ret = ip_mc_join_group(sk, &mreq);
b1be00a6 1100 release_sock(sk);
e4c7ed41
CW		 1101#if IS_ENABLED(CONFIG_IPV6)
1102 } else {
b1be00a6
JB		 1103 sk = vxlan->vn6_sock->sock->sk;
1104 lock_sock(sk);
56ef9c90
MRL		 1105 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1106 &ip->sin6.sin6_addr);
b1be00a6 1107 release_sock(sk);
e4c7ed41
CW		 1108#endif
1109 }
3fc2de2f 1110
56ef9c90 1111 return ret;
3fc2de2f 1112}
1113
1114/* Inverse of vxlan_igmp_join when last VNI is brought down */
56ef9c90 1115static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
3fc2de2f 1116{
b1be00a6 1117 struct sock *sk;
e4c7ed41
CW		 1118 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1119 int ifindex = vxlan->default_dst.remote_ifindex;
149d7549 1120 int ret = -EINVAL;
3fc2de2f 1121
e4c7ed41
CW		 1122 if (ip->sa.sa_family == AF_INET) {
1123 struct ip_mreqn mreq = {
1124 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1125 .imr_ifindex = ifindex,
1126 };
1127
b1be00a6
JB		 1128 sk = vxlan->vn4_sock->sock->sk;
1129 lock_sock(sk);
56ef9c90 1130 ret = ip_mc_leave_group(sk, &mreq);
b1be00a6 1131 release_sock(sk);
e4c7ed41
CW		 1132#if IS_ENABLED(CONFIG_IPV6)
1133 } else {
b1be00a6
JB		 1134 sk = vxlan->vn6_sock->sock->sk;
1135 lock_sock(sk);
56ef9c90
MRL		 1136 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1137 &ip->sin6.sin6_addr);
b1be00a6 1138 release_sock(sk);
e4c7ed41
CW		 1139#endif
1140 }
d342894c 1141
56ef9c90 1142 return ret;
d342894c 1143}
1144
f14ecebb
JB		 1145static bool vxlan_remcsum(struct vxlanhdr *unparsed,
1146 struct sk_buff *skb, u32 vxflags)
dfd8645e 1147{
7d34fa75 1148 size_t start, offset;
dfd8645e 1149
f14ecebb
JB		 1150 if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
1151 goto out;
b7fe10e5 1152
f14ecebb
JB		 1153 start = vxlan_rco_start(unparsed->vx_vni);
1154 offset = start + vxlan_rco_offset(unparsed->vx_vni);
dfd8645e 1155
7d34fa75 1156 if (!pskb_may_pull(skb, offset + sizeof(u16)))
be5cfeab 1157 return false;
dfd8645e 1158
be5cfeab
JB		 1159 skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
1160 !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL));
f14ecebb
JB		 1161out:
1162 unparsed->vx_flags &= ~VXLAN_HF_RCO;
1163 unparsed->vx_vni &= VXLAN_VNI_MASK;
be5cfeab 1164 return true;
dfd8645e
TH		 1165}
1166
f14ecebb 1167static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
64f87d36 1168 struct sk_buff *skb, u32 vxflags,
10a5af23 1169 struct vxlan_metadata *md)
3288af08 1170{
f14ecebb 1171 struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
10a5af23 1172 struct metadata_dst *tun_dst;
f14ecebb
JB		 1173
1174 if (!(unparsed->vx_flags & VXLAN_HF_GBP))
1175 goto out;
3288af08 1176
3288af08
JB		 1177 md->gbp = ntohs(gbp->policy_id);
1178
10a5af23 1179 tun_dst = (struct metadata_dst *)skb_dst(skb);
810813c4 1180 if (tun_dst) {
3288af08 1181 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
810813c4
DM		 1182 tun_dst->u.tun_info.options_len = sizeof(*md);
1183 }
3288af08
JB		 1184 if (gbp->dont_learn)
1185 md->gbp |= VXLAN_GBP_DONT_LEARN;
1186
1187 if (gbp->policy_applied)
1188 md->gbp |= VXLAN_GBP_POLICY_APPLIED;
f14ecebb 1189
64f87d36
JB		 1190 /* In flow-based mode, GBP is carried in dst_metadata */
1191 if (!(vxflags & VXLAN_F_COLLECT_METADATA))
1192 skb->mark = md->gbp;
f14ecebb
JB		 1193out:
1194 unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
3288af08
JB		 1195}
1196
e1e5314d 1197static bool vxlan_parse_gpe_hdr(struct vxlanhdr *unparsed,
61618eea 1198 __be16 *protocol,
e1e5314d
JB		 1199 struct sk_buff *skb, u32 vxflags)
1200{
1201 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)unparsed;
1202
1203 /* Need to have Next Protocol set for interfaces in GPE mode. */
1204 if (!gpe->np_applied)
1205 return false;
1206 /* "The initial version is 0. If a receiver does not support the
1207 * version indicated it MUST drop the packet.
1208 */
1209 if (gpe->version != 0)
1210 return false;
1211 /* "When the O bit is set to 1, the packet is an OAM packet and OAM
1212 * processing MUST occur." However, we don't implement OAM
1213 * processing, thus drop the packet.
1214 */
1215 if (gpe->oam_flag)
1216 return false;
1217
1218 switch (gpe->next_protocol) {
1219 case VXLAN_GPE_NP_IPV4:
1220 *protocol = htons(ETH_P_IP);
1221 break;
1222 case VXLAN_GPE_NP_IPV6:
1223 *protocol = htons(ETH_P_IPV6);
1224 break;
1225 case VXLAN_GPE_NP_ETHERNET:
1226 *protocol = htons(ETH_P_TEB);
1227 break;
1228 default:
1229 return false;
1230 }
1231
1232 unparsed->vx_flags &= ~VXLAN_GPE_USED_BITS;
1233 return true;
1234}
1235
1ab016e2
JB		 1236static bool vxlan_set_mac(struct vxlan_dev *vxlan,
1237 struct vxlan_sock *vs,
1238 struct sk_buff *skb)
614732ea 1239{
614732ea 1240 union vxlan_addr saddr;
614732ea 1241
614732ea 1242 skb_reset_mac_header(skb);
614732ea
TG		 1243 skb->protocol = eth_type_trans(skb, vxlan->dev);
1244 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1245
1246 /* Ignore packet loops (and multicast echo) */
1247 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1ab016e2 1248 return false;
614732ea 1249
760c6805 1250 /* Get address from the outer IP header */
ce212d0f 1251 if (vxlan_get_sk_family(vs) == AF_INET) {
1ab016e2 1252 saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
614732ea
TG		 1253 saddr.sa.sa_family = AF_INET;
1254#if IS_ENABLED(CONFIG_IPV6)
1255 } else {
1ab016e2 1256 saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
614732ea
TG		 1257 saddr.sa.sa_family = AF_INET6;
1258#endif
1259 }
1260
1ab016e2
JB		 1261 if ((vxlan->flags & VXLAN_F_LEARN) &&
1262 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
1263 return false;
1264
1265 return true;
1266}
1267
760c6805
JB		 1268static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph,
1269 struct sk_buff *skb)
1270{
1271 int err = 0;
1272
1273 if (vxlan_get_sk_family(vs) == AF_INET)
1274 err = IP_ECN_decapsulate(oiph, skb);
1275#if IS_ENABLED(CONFIG_IPV6)
1276 else
1277 err = IP6_ECN_decapsulate(oiph, skb);
1278#endif
1279
1280 if (unlikely(err) && log_ecn_error) {
1281 if (vxlan_get_sk_family(vs) == AF_INET)
1282 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1283 &((struct iphdr *)oiph)->saddr,
1284 ((struct iphdr *)oiph)->tos);
1285 else
1286 net_info_ratelimited("non-ECT from %pI6\n",
1287 &((struct ipv6hdr *)oiph)->saddr);
1288 }
1289 return err <= 1;
1290}
1291
d342894c 1292/* Callback from net/ipv4/udp.c to receive packets */
f2d1968e 1293static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
d342894c 1294{
f2d1968e 1295 struct pcpu_sw_netstats *stats;
c9e78efb 1296 struct vxlan_dev *vxlan;
5cfccc5a 1297 struct vxlan_sock *vs;
f14ecebb 1298 struct vxlanhdr unparsed;
ee122c79
TG		 1299 struct vxlan_metadata _md;
1300 struct vxlan_metadata *md = &_md;
61618eea 1301 __be16 protocol = htons(ETH_P_TEB);
e1e5314d 1302 bool raw_proto = false;
f2d1968e 1303 void *oiph;
d342894c 1304
e1e5314d 1305 /* Need UDP and VXLAN header to be present */
7ce04758 1306 if (!pskb_may_pull(skb, VXLAN_HLEN))
e5aed006 1307 goto drop;
d342894c 1308
f14ecebb 1309 unparsed = *vxlan_hdr(skb);
288b01c8
JB		 1310 /* VNI flag always required to be set */
1311 if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
1312 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1313 ntohl(vxlan_hdr(skb)->vx_flags),
1314 ntohl(vxlan_hdr(skb)->vx_vni));
1315 /* Return non vxlan pkt */
e5aed006 1316 goto drop;
d342894c 1317 }
288b01c8
JB		 1318 unparsed.vx_flags &= ~VXLAN_HF_VNI;
1319 unparsed.vx_vni &= ~VXLAN_VNI_MASK;
d342894c 1320
559835ea 1321 vs = rcu_dereference_sk_user_data(sk);
5cfccc5a 1322 if (!vs)
d342894c 1323 goto drop;
d342894c 1324
c9e78efb
JB		 1325 vxlan = vxlan_vs_find_vni(vs, vxlan_vni(vxlan_hdr(skb)->vx_vni));
1326 if (!vxlan)
1327 goto drop;
1328
e1e5314d
JB		 1329 /* For backwards compatibility, only allow reserved fields to be
1330 * used by VXLAN extensions if explicitly requested.
1331 */
1332 if (vs->flags & VXLAN_F_GPE) {
1333 if (!vxlan_parse_gpe_hdr(&unparsed, &protocol, skb, vs->flags))
1334 goto drop;
1335 raw_proto = true;
1336 }
1337
1338 if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto,
1339 !net_eq(vxlan->net, dev_net(vxlan->dev))))
1340 goto drop;
c9e78efb 1341
ee122c79 1342 if (vxlan_collect_metadata(vs)) {
07dabf20 1343 __be32 vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
10a5af23 1344 struct metadata_dst *tun_dst;
07dabf20 1345
c29a70d2 1346 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
07dabf20 1347 vxlan_vni_to_tun_id(vni), sizeof(*md));
c29a70d2 1348
ee122c79
TG		 1349 if (!tun_dst)
1350 goto drop;
1351
0f1b7354 1352 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
10a5af23
JB		 1353
1354 skb_dst_set(skb, (struct dst_entry *)tun_dst);
ee122c79
TG		 1355 } else {
1356 memset(md, 0, sizeof(*md));
1357 }
1358
f14ecebb
JB		 1359 if (vs->flags & VXLAN_F_REMCSUM_RX)
1360 if (!vxlan_remcsum(&unparsed, skb, vs->flags))
1361 goto drop;
1362 if (vs->flags & VXLAN_F_GBP)
10a5af23 1363 vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md);
e1e5314d
JB		 1364 /* Note that GBP and GPE can never be active together. This is
1365 * ensured in vxlan_dev_configure.
1366 */
3511494c 1367
f14ecebb 1368 if (unparsed.vx_flags || unparsed.vx_vni) {
3bf39475
TH		 1369 /* If there are any unprocessed flags remaining treat
1370 * this as a malformed packet. This behavior diverges from
1371 * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1372 * in reserved fields are to be ignored. The approach here
c4b49512 1373 * maintains compatibility with previous stack code, and also
3bf39475
TH		 1374 * is more robust and provides a little more security in
1375 * adding extensions to VXLAN.
1376 */
288b01c8 1377 goto drop;
3bf39475
TH		 1378 }
1379
e1e5314d
JB		 1380 if (!raw_proto) {
1381 if (!vxlan_set_mac(vxlan, vs, skb))
1382 goto drop;
1383 } else {
8be0cfa4 1384 skb_reset_mac_header(skb);
e1e5314d
JB		 1385 skb->dev = vxlan->dev;
1386 skb->pkt_type = PACKET_HOST;
1387 }
f2d1968e 1388
f2d1968e
JB		 1389 oiph = skb_network_header(skb);
1390 skb_reset_network_header(skb);
1391
1392 if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
1393 ++vxlan->dev->stats.rx_frame_errors;
1394 ++vxlan->dev->stats.rx_errors;
1395 goto drop;
1396 }
1397
1398 stats = this_cpu_ptr(vxlan->dev->tstats);
1399 u64_stats_update_begin(&stats->syncp);
1400 stats->rx_packets++;
1401 stats->rx_bytes += skb->len;
1402 u64_stats_update_end(&stats->syncp);
1403
1404 gro_cells_receive(&vxlan->gro_cells, skb);
5cfccc5a
PS		 1405 return 0;
1406
1407drop:
288b01c8
JB		 1408 /* Consume bad packet */
1409 kfree_skb(skb);
1410 return 0;
5cfccc5a
PS		 1411}
1412
e4f67add
DS		 1413static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1414{
1415 struct vxlan_dev *vxlan = netdev_priv(dev);
1416 struct arphdr *parp;
1417 u8 *arpptr, *sha;
1418 __be32 sip, tip;
1419 struct neighbour *n;
1420
1421 if (dev->flags & IFF_NOARP)
1422 goto out;
1423
1424 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1425 dev->stats.tx_dropped++;
1426 goto out;
1427 }
1428 parp = arp_hdr(skb);
1429
1430 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1431 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1432 parp->ar_pro != htons(ETH_P_IP) ||
1433 parp->ar_op != htons(ARPOP_REQUEST) ||
1434 parp->ar_hln != dev->addr_len ||
1435 parp->ar_pln != 4)
1436 goto out;
1437 arpptr = (u8 *)parp + sizeof(struct arphdr);
1438 sha = arpptr;
1439 arpptr += dev->addr_len; /* sha */
1440 memcpy(&sip, arpptr, sizeof(sip));
1441 arpptr += sizeof(sip);
1442 arpptr += dev->addr_len; /* tha */
1443 memcpy(&tip, arpptr, sizeof(tip));
1444
1445 if (ipv4_is_loopback(tip) ||
1446 ipv4_is_multicast(tip))
1447 goto out;
1448
1449 n = neigh_lookup(&arp_tbl, &tip, dev);
1450
1451 if (n) {
e4f67add
DS		 1452 struct vxlan_fdb *f;
1453 struct sk_buff *reply;
1454
1455 if (!(n->nud_state & NUD_CONNECTED)) {
1456 neigh_release(n);
1457 goto out;
1458 }
1459
1460 f = vxlan_find_mac(vxlan, n->ha);
e4c7ed41 1461 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
e4f67add
DS		 1462 /* bridge-local neighbor */
1463 neigh_release(n);
1464 goto out;
1465 }
1466
1467 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1468 n->ha, sha);
1469
1470 neigh_release(n);
1471
7346135d
DS		 1472 if (reply == NULL)
1473 goto out;
1474
e4f67add
DS		 1475 skb_reset_mac_header(reply);
1476 __skb_pull(reply, skb_network_offset(reply));
1477 reply->ip_summed = CHECKSUM_UNNECESSARY;
1478 reply->pkt_type = PACKET_HOST;
1479
1480 if (netif_rx_ni(reply) == NET_RX_DROP)
1481 dev->stats.rx_dropped++;
e4c7ed41
CW		 1482 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1483 union vxlan_addr ipa = {
1484 .sin.sin_addr.s_addr = tip,
a45e92a5 1485 .sin.sin_family = AF_INET,
e4c7ed41
CW		 1486 };
1487
1488 vxlan_ip_miss(dev, &ipa);
1489 }
e4f67add
DS		 1490out:
1491 consume_skb(skb);
1492 return NETDEV_TX_OK;
1493}
1494
f564f45c 1495#if IS_ENABLED(CONFIG_IPV6)
4b29dba9
DS		 1496static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1497 struct neighbour *n, bool isrouter)
1498{
1499 struct net_device *dev = request->dev;
1500 struct sk_buff *reply;
1501 struct nd_msg *ns, *na;
1502 struct ipv6hdr *pip6;
1503 u8 *daddr;
1504 int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1505 int ns_olen;
1506 int i, len;
1507
1508 if (dev == NULL)
1509 return NULL;
1510
1511 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1512 sizeof(*na) + na_olen + dev->needed_tailroom;
1513 reply = alloc_skb(len, GFP_ATOMIC);
1514 if (reply == NULL)
1515 return NULL;
1516
1517 reply->protocol = htons(ETH_P_IPV6);
1518 reply->dev = dev;
1519 skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1520 skb_push(reply, sizeof(struct ethhdr));
6297b91c 1521 skb_reset_mac_header(reply);
4b29dba9
DS		 1522
1523 ns = (struct nd_msg *)skb_transport_header(request);
1524
1525 daddr = eth_hdr(request)->h_source;
1526 ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
1527 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1528 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1529 daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1530 break;
1531 }
1532 }
1533
1534 /* Ethernet header */
1535 ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1536 ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1537 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1538 reply->protocol = htons(ETH_P_IPV6);
1539
1540 skb_pull(reply, sizeof(struct ethhdr));
6297b91c 1541 skb_reset_network_header(reply);
4b29dba9
DS		 1542 skb_put(reply, sizeof(struct ipv6hdr));
1543
1544 /* IPv6 header */
1545
1546 pip6 = ipv6_hdr(reply);
1547 memset(pip6, 0, sizeof(struct ipv6hdr));
1548 pip6->version = 6;
1549 pip6->priority = ipv6_hdr(request)->priority;
1550 pip6->nexthdr = IPPROTO_ICMPV6;
1551 pip6->hop_limit = 255;
1552 pip6->daddr = ipv6_hdr(request)->saddr;
1553 pip6->saddr = *(struct in6_addr *)n->primary_key;
1554
1555 skb_pull(reply, sizeof(struct ipv6hdr));
6297b91c 1556 skb_reset_transport_header(reply);
4b29dba9
DS		 1557
1558 na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1559
1560 /* Neighbor Advertisement */
1561 memset(na, 0, sizeof(*na)+na_olen);
1562 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1563 na->icmph.icmp6_router = isrouter;
1564 na->icmph.icmp6_override = 1;
1565 na->icmph.icmp6_solicited = 1;
1566 na->target = ns->target;
1567 ether_addr_copy(&na->opt[2], n->ha);
1568 na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1569 na->opt[1] = na_olen >> 3;
1570
1571 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1572 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1573 csum_partial(na, sizeof(*na)+na_olen, 0));
1574
1575 pip6->payload_len = htons(sizeof(*na)+na_olen);
1576
1577 skb_push(reply, sizeof(struct ipv6hdr));
1578
1579 reply->ip_summed = CHECKSUM_UNNECESSARY;
1580
1581 return reply;
1582}
1583
f564f45c
CW		 1584static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1585{
1586 struct vxlan_dev *vxlan = netdev_priv(dev);
4b29dba9 1587 struct nd_msg *msg;
f564f45c
CW		 1588 const struct ipv6hdr *iphdr;
1589 const struct in6_addr *saddr, *daddr;
4b29dba9
DS		 1590 struct neighbour *n;
1591 struct inet6_dev *in6_dev;
f564f45c
CW		 1592
1593 in6_dev = __in6_dev_get(dev);
1594 if (!in6_dev)
1595 goto out;
1596
f564f45c
CW		 1597 iphdr = ipv6_hdr(skb);
1598 saddr = &iphdr->saddr;
1599 daddr = &iphdr->daddr;
1600
f564f45c
CW		 1601 msg = (struct nd_msg *)skb_transport_header(skb);
1602 if (msg->icmph.icmp6_code != 0 ||
1603 msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1604 goto out;
1605
4b29dba9
DS		 1606 if (ipv6_addr_loopback(daddr) ||
1607 ipv6_addr_is_multicast(&msg->target))
1608 goto out;
1609
1610 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
f564f45c
CW		 1611
1612 if (n) {
1613 struct vxlan_fdb *f;
4b29dba9 1614 struct sk_buff *reply;
f564f45c
CW		 1615
1616 if (!(n->nud_state & NUD_CONNECTED)) {
1617 neigh_release(n);
1618 goto out;
1619 }
1620
1621 f = vxlan_find_mac(vxlan, n->ha);
1622 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1623 /* bridge-local neighbor */
1624 neigh_release(n);
1625 goto out;
1626 }
1627
4b29dba9
DS		 1628 reply = vxlan_na_create(skb, n,
1629 !!(f ? f->flags & NTF_ROUTER : 0));
1630
f564f45c 1631 neigh_release(n);
4b29dba9
DS		 1632
1633 if (reply == NULL)
1634 goto out;
1635
1636 if (netif_rx_ni(reply) == NET_RX_DROP)
1637 dev->stats.rx_dropped++;
1638
f564f45c 1639 } else if (vxlan->flags & VXLAN_F_L3MISS) {
4b29dba9
DS		 1640 union vxlan_addr ipa = {
1641 .sin6.sin6_addr = msg->target,
a45e92a5 1642 .sin6.sin6_family = AF_INET6,
4b29dba9
DS		 1643 };
1644
f564f45c
CW		 1645 vxlan_ip_miss(dev, &ipa);
1646 }
1647
1648out:
1649 consume_skb(skb);
1650 return NETDEV_TX_OK;
1651}
1652#endif
1653
e4f67add
DS		 1654static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1655{
1656 struct vxlan_dev *vxlan = netdev_priv(dev);
1657 struct neighbour *n;
e4f67add
DS		 1658
1659 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1660 return false;
1661
1662 n = NULL;
1663 switch (ntohs(eth_hdr(skb)->h_proto)) {
1664 case ETH_P_IP:
e15a00aa
CW		 1665 {
1666 struct iphdr *pip;
1667
e4f67add
DS		 1668 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1669 return false;
1670 pip = ip_hdr(skb);
1671 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
e4c7ed41
CW		 1672 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1673 union vxlan_addr ipa = {
1674 .sin.sin_addr.s_addr = pip->daddr,
a45e92a5 1675 .sin.sin_family = AF_INET,
e4c7ed41
CW		 1676 };
1677
1678 vxlan_ip_miss(dev, &ipa);
1679 return false;
1680 }
1681
e4f67add 1682 break;
e15a00aa
CW		 1683 }
1684#if IS_ENABLED(CONFIG_IPV6)
1685 case ETH_P_IPV6:
1686 {
1687 struct ipv6hdr *pip6;
1688
1689 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1690 return false;
1691 pip6 = ipv6_hdr(skb);
1692 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1693 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1694 union vxlan_addr ipa = {
1695 .sin6.sin6_addr = pip6->daddr,
a45e92a5 1696 .sin6.sin6_family = AF_INET6,
e15a00aa
CW		 1697 };
1698
1699 vxlan_ip_miss(dev, &ipa);
1700 return false;
1701 }
1702
1703 break;
1704 }
1705#endif
e4f67add
DS		 1706 default:
1707 return false;
1708 }
1709
1710 if (n) {
1711 bool diff;
1712
7367d0b5 1713 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
e4f67add
DS		 1714 if (diff) {
1715 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1716 dev->addr_len);
1717 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1718 }
1719 neigh_release(n);
1720 return diff;
e4c7ed41
CW		 1721 }
1722
e4f67add
DS		 1723 return false;
1724}
1725
af33c1ad 1726static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
3511494c
TG		 1727 struct vxlan_metadata *md)
1728{
1729 struct vxlanhdr_gbp *gbp;
1730
db79a621
TG		 1731 if (!md->gbp)
1732 return;
1733
3511494c 1734 gbp = (struct vxlanhdr_gbp *)vxh;
54bfd872 1735 vxh->vx_flags |= VXLAN_HF_GBP;
3511494c
TG		 1736
1737 if (md->gbp & VXLAN_GBP_DONT_LEARN)
1738 gbp->dont_learn = 1;
1739
1740 if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1741 gbp->policy_applied = 1;
1742
1743 gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1744}
1745
e1e5314d
JB		 1746static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, u32 vxflags,
1747 __be16 protocol)
1748{
1749 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh;
1750
1751 gpe->np_applied = 1;
1752
1753 switch (protocol) {
1754 case htons(ETH_P_IP):
1755 gpe->next_protocol = VXLAN_GPE_NP_IPV4;
1756 return 0;
1757 case htons(ETH_P_IPV6):
1758 gpe->next_protocol = VXLAN_GPE_NP_IPV6;
1759 return 0;
1760 case htons(ETH_P_TEB):
1761 gpe->next_protocol = VXLAN_GPE_NP_ETHERNET;
1762 return 0;
1763 }
1764 return -EPFNOSUPPORT;
1765}
1766
f491e56d
JB		 1767static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
1768 int iphdr_len, __be32 vni,
1769 struct vxlan_metadata *md, u32 vxflags,
b4ed5cad 1770 bool udp_sum)
e4c7ed41 1771{
e4c7ed41 1772 struct vxlanhdr *vxh;
e4c7ed41
CW		 1773 int min_headroom;
1774 int err;
dfd8645e 1775 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
e1e5314d 1776 __be16 inner_protocol = htons(ETH_P_TEB);
dfd8645e 1777
af33c1ad 1778 if ((vxflags & VXLAN_F_REMCSUM_TX) &&
dfd8645e
TH		 1779 skb->ip_summed == CHECKSUM_PARTIAL) {
1780 int csum_start = skb_checksum_start_offset(skb);
1781
1782 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1783 !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1784 (skb->csum_offset == offsetof(struct udphdr, check) ||
b5708501 1785 skb->csum_offset == offsetof(struct tcphdr, check)))
dfd8645e 1786 type |= SKB_GSO_TUNNEL_REMCSUM;
dfd8645e 1787 }
e4c7ed41 1788
e4c7ed41 1789 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
f491e56d 1790 + VXLAN_HLEN + iphdr_len
df8a39de 1791 + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
649c5b8b
PS		 1792
1793 /* Need space for new headers (invalidates iph ptr) */
1794 err = skb_cow_head(skb, min_headroom);
e1e5314d
JB		 1795 if (unlikely(err))
1796 goto out_free;
649c5b8b 1797
5968250c
JP		 1798 skb = vlan_hwaccel_push_inside(skb);
1799 if (WARN_ON(!skb))
1800 return -ENOMEM;
1eaa8178 1801
aed069df
AD		 1802 err = iptunnel_handle_offloads(skb, type);
1803 if (err)
1804 goto out_free;
b736a623 1805
49560532 1806 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
54bfd872
JB		 1807 vxh->vx_flags = VXLAN_HF_VNI;
1808 vxh->vx_vni = vxlan_vni_field(vni);
49560532 1809
dfd8645e 1810 if (type & SKB_GSO_TUNNEL_REMCSUM) {
54bfd872 1811 unsigned int start;
dfd8645e 1812
54bfd872
JB		 1813 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
1814 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
1815 vxh->vx_flags |= VXLAN_HF_RCO;
dfd8645e
TH		 1816
1817 if (!skb_is_gso(skb)) {
1818 skb->ip_summed = CHECKSUM_NONE;
1819 skb->encapsulation = 0;
1820 }
1821 }
1822
af33c1ad
TH		 1823 if (vxflags & VXLAN_F_GBP)
1824 vxlan_build_gbp_hdr(vxh, vxflags, md);
e1e5314d
JB		 1825 if (vxflags & VXLAN_F_GPE) {
1826 err = vxlan_build_gpe_hdr(vxh, vxflags, skb->protocol);
1827 if (err < 0)
1828 goto out_free;
1829 inner_protocol = skb->protocol;
1830 }
3511494c 1831
e1e5314d 1832 skb_set_inner_protocol(skb, inner_protocol);
039f5062 1833 return 0;
e1e5314d
JB		 1834
1835out_free:
1836 kfree_skb(skb);
1837 return err;
49560532 1838}
49560532 1839
1a8496ba
JB		 1840static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan,
1841 struct sk_buff *skb, int oif, u8 tos,
0c1d70af
PA		 1842 __be32 daddr, __be32 *saddr,
1843 struct dst_cache *dst_cache,
db3c6139 1844 const struct ip_tunnel_info *info)
1a8496ba 1845{
db3c6139 1846 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
1a8496ba
JB		 1847 struct rtable *rt = NULL;
1848 struct flowi4 fl4;
1849
db3c6139
DB		 1850 if (tos && !info)
1851 use_cache = false;
1852 if (use_cache) {
0c1d70af
PA		 1853 rt = dst_cache_get_ip4(dst_cache, saddr);
1854 if (rt)
1855 return rt;
1856 }
1857
1a8496ba
JB		 1858 memset(&fl4, 0, sizeof(fl4));
1859 fl4.flowi4_oif = oif;
1860 fl4.flowi4_tos = RT_TOS(tos);
1861 fl4.flowi4_mark = skb->mark;
1862 fl4.flowi4_proto = IPPROTO_UDP;
1863 fl4.daddr = daddr;
1864 fl4.saddr = vxlan->cfg.saddr.sin.sin_addr.s_addr;
1865
1866 rt = ip_route_output_key(vxlan->net, &fl4);
0c1d70af 1867 if (!IS_ERR(rt)) {
1a8496ba 1868 *saddr = fl4.saddr;
0c1d70af
PA		 1869 if (use_cache)
1870 dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
1871 }
1a8496ba
JB		 1872 return rt;
1873}
1874
e5d4b29f
JB		 1875#if IS_ENABLED(CONFIG_IPV6)
1876static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
1400615d 1877 struct sk_buff *skb, int oif, u8 tos,
e7f70af1 1878 __be32 label,
e5d4b29f 1879 const struct in6_addr *daddr,
0c1d70af 1880 struct in6_addr *saddr,
db3c6139
DB		 1881 struct dst_cache *dst_cache,
1882 const struct ip_tunnel_info *info)
e5d4b29f 1883{
db3c6139 1884 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
e5d4b29f
JB		 1885 struct dst_entry *ndst;
1886 struct flowi6 fl6;
1887 int err;
1888
1400615d
DB		 1889 if (tos && !info)
1890 use_cache = false;
db3c6139 1891 if (use_cache) {
0c1d70af
PA		 1892 ndst = dst_cache_get_ip6(dst_cache, saddr);
1893 if (ndst)
1894 return ndst;
1895 }
1896
e5d4b29f
JB		 1897 memset(&fl6, 0, sizeof(fl6));
1898 fl6.flowi6_oif = oif;
1899 fl6.daddr = *daddr;
1900 fl6.saddr = vxlan->cfg.saddr.sin6.sin6_addr;
eaa93bf4 1901 fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tos), label);
e5d4b29f
JB		 1902 fl6.flowi6_mark = skb->mark;
1903 fl6.flowi6_proto = IPPROTO_UDP;
1904
1905 err = ipv6_stub->ipv6_dst_lookup(vxlan->net,
1906 vxlan->vn6_sock->sock->sk,
1907 &ndst, &fl6);
1908 if (err < 0)
1909 return ERR_PTR(err);
1910
1911 *saddr = fl6.saddr;
db3c6139 1912 if (use_cache)
0c1d70af 1913 dst_cache_set_ip6(dst_cache, ndst, saddr);
e5d4b29f
JB		 1914 return ndst;
1915}
1916#endif
1917
9dcc71e1
SS		 1918/* Bypass encapsulation if the destination is local */
1919static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1920 struct vxlan_dev *dst_vxlan)
1921{
8f84985f 1922 struct pcpu_sw_netstats *tx_stats, *rx_stats;
e4c7ed41
CW		 1923 union vxlan_addr loopback;
1924 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
ce6502a8
LR		 1925 struct net_device *dev = skb->dev;
1926 int len = skb->len;
9dcc71e1 1927
8f84985f
LR		 1928 tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1929 rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
9dcc71e1
SS		 1930 skb->pkt_type = PACKET_HOST;
1931 skb->encapsulation = 0;
1932 skb->dev = dst_vxlan->dev;
1933 __skb_pull(skb, skb_network_offset(skb));
1934
e4c7ed41
CW		 1935 if (remote_ip->sa.sa_family == AF_INET) {
1936 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1937 loopback.sa.sa_family = AF_INET;
1938#if IS_ENABLED(CONFIG_IPV6)
1939 } else {
1940 loopback.sin6.sin6_addr = in6addr_loopback;
1941 loopback.sa.sa_family = AF_INET6;
1942#endif
1943 }
1944
9dcc71e1 1945 if (dst_vxlan->flags & VXLAN_F_LEARN)
e4c7ed41 1946 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
9dcc71e1
SS		 1947
1948 u64_stats_update_begin(&tx_stats->syncp);
1949 tx_stats->tx_packets++;
ce6502a8 1950 tx_stats->tx_bytes += len;
9dcc71e1
SS		 1951 u64_stats_update_end(&tx_stats->syncp);
1952
1953 if (netif_rx(skb) == NET_RX_SUCCESS) {
1954 u64_stats_update_begin(&rx_stats->syncp);
1955 rx_stats->rx_packets++;
ce6502a8 1956 rx_stats->rx_bytes += len;
9dcc71e1
SS		 1957 u64_stats_update_end(&rx_stats->syncp);
1958 } else {
ce6502a8 1959 dev->stats.rx_dropped++;
9dcc71e1
SS		 1960 }
1961}
1962
4ad16930
SH		 1963static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1964 struct vxlan_rdst *rdst, bool did_rsc)
d342894c 1965{
d71785ff 1966 struct dst_cache *dst_cache;
3093fbe7 1967 struct ip_tunnel_info *info;
d342894c 1968 struct vxlan_dev *vxlan = netdev_priv(dev);
b1be00a6 1969 struct sock *sk;
e4c7ed41 1970 struct rtable *rt = NULL;
d342894c 1971 const struct iphdr *old_iph;
e4c7ed41 1972 union vxlan_addr *dst;
ee122c79
TG		 1973 union vxlan_addr remote_ip;
1974 struct vxlan_metadata _md;
1975 struct vxlan_metadata *md = &_md;
e4c7ed41 1976 __be16 src_port = 0, dst_port;
e7f70af1 1977 __be32 vni, label;
d342894c 1978 __be16 df = 0;
1979 __u8 tos, ttl;
0e6fbc5b 1980 int err;
ee122c79 1981 u32 flags = vxlan->flags;
b4ed5cad 1982 bool udp_sum = false;
f491e56d 1983 bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
d342894c 1984
61adedf3 1985 info = skb_tunnel_info(skb);
3093fbe7 1986
ee122c79 1987 if (rdst) {
0dfbdf41 1988 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
ee122c79
TG		 1989 vni = rdst->remote_vni;
1990 dst = &rdst->remote_ip;
d71785ff 1991 dst_cache = &rdst->dst_cache;
ee122c79
TG		 1992 } else {
1993 if (!info) {
1994 WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
1995 dev->name);
1996 goto drop;
1997 }
0dfbdf41 1998 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
54bfd872 1999 vni = vxlan_tun_id_to_vni(info->key.tun_id);
b1be00a6
JB		 2000 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
2001 if (remote_ip.sa.sa_family == AF_INET)
a725e514
JB		 2002 remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
2003 else
2004 remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
ee122c79 2005 dst = &remote_ip;
d71785ff 2006 dst_cache = &info->dst_cache;
ee122c79 2007 }
e4f67add 2008
e4c7ed41 2009 if (vxlan_addr_any(dst)) {
e4f67add 2010 if (did_rsc) {
e4f67add 2011 /* short-circuited back to local bridge */
9dcc71e1 2012 vxlan_encap_bypass(skb, vxlan, vxlan);
4ad16930 2013 return;
e4f67add 2014 }
ef59febe 2015 goto drop;
e4f67add 2016 }
ef59febe 2017
d342894c 2018 old_iph = ip_hdr(skb);
2019
0dfbdf41 2020 ttl = vxlan->cfg.ttl;
e4c7ed41 2021 if (!ttl && vxlan_addr_multicast(dst))
d342894c 2022 ttl = 1;
2023
0dfbdf41 2024 tos = vxlan->cfg.tos;
d342894c 2025 if (tos == 1)
206aaafc 2026 tos = ip_tunnel_get_dsfield(old_iph, skb);
d342894c 2027
e7f70af1 2028 label = vxlan->cfg.label;
0dfbdf41
TG		 2029 src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2030 vxlan->cfg.port_max, true);
d342894c 2031
a725e514 2032 if (info) {
a725e514
JB		 2033 ttl = info->key.ttl;
2034 tos = info->key.tos;
e7f70af1 2035 label = info->key.label;
b4ed5cad 2036 udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
a725e514
JB		 2037
2038 if (info->options_len)
4c222798 2039 md = ip_tunnel_info_opts(info);
a725e514
JB		 2040 } else {
2041 md->gbp = skb->mark;
2042 }
2043
e4c7ed41 2044 if (dst->sa.sa_family == AF_INET) {
1a8496ba
JB		 2045 __be32 saddr;
2046
b1be00a6
JB		 2047 if (!vxlan->vn4_sock)
2048 goto drop;
2049 sk = vxlan->vn4_sock->sock->sk;
2050
1a8496ba
JB		 2051 rt = vxlan_get_route(vxlan, skb,
2052 rdst ? rdst->remote_ifindex : 0, tos,
0c1d70af 2053 dst->sin.sin_addr.s_addr, &saddr,
d71785ff 2054 dst_cache, info);
e4c7ed41
CW		 2055 if (IS_ERR(rt)) {
2056 netdev_dbg(dev, "no route to %pI4\n",
2057 &dst->sin.sin_addr.s_addr);
2058 dev->stats.tx_carrier_errors++;
2059 goto tx_error;
2060 }
d342894c 2061
e4c7ed41
CW		 2062 if (rt->dst.dev == dev) {
2063 netdev_dbg(dev, "circular route to %pI4\n",
2064 &dst->sin.sin_addr.s_addr);
2065 dev->stats.collisions++;
fffc15a5 2066 goto rt_tx_error;
e4c7ed41
CW		 2067 }
2068
2069 /* Bypass encapsulation if the destination is local */
2070 if (rt->rt_flags & RTCF_LOCAL &&
2071 !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2072 struct vxlan_dev *dst_vxlan;
2073
2074 ip_rt_put(rt);
19ca9fc1 2075 dst_vxlan = vxlan_find_vni(vxlan->net, vni,
ac5132d1
TG		 2076 dst->sa.sa_family, dst_port,
2077 vxlan->flags);
e4c7ed41
CW		 2078 if (!dst_vxlan)
2079 goto tx_error;
2080 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2081 return;
2082 }
2083
6ceb31ca
AD		 2084 if (!info)
2085 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
2086 else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT)
2087 df = htons(IP_DF);
2088
e4c7ed41
CW		 2089 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2090 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
f491e56d 2091 err = vxlan_build_skb(skb, &rt->dst, sizeof(struct iphdr),
54bfd872 2092 vni, md, flags, udp_sum);
f491e56d
JB		 2093 if (err < 0)
2094 goto xmit_tx_error;
2095
2096 udp_tunnel_xmit_skb(rt, sk, skb, saddr,
2097 dst->sin.sin_addr.s_addr, tos, ttl, df,
2098 src_port, dst_port, xnet, !udp_sum);
e4c7ed41
CW		 2099#if IS_ENABLED(CONFIG_IPV6)
2100 } else {
e4c7ed41 2101 struct dst_entry *ndst;
e5d4b29f 2102 struct in6_addr saddr;
6f264e47 2103 u32 rt6i_flags;
e4c7ed41 2104
b1be00a6
JB		 2105 if (!vxlan->vn6_sock)
2106 goto drop;
2107 sk = vxlan->vn6_sock->sock->sk;
2108
e5d4b29f 2109 ndst = vxlan6_get_route(vxlan, skb,
1400615d 2110 rdst ? rdst->remote_ifindex : 0, tos,
e7f70af1 2111 label, &dst->sin6.sin6_addr, &saddr,
db3c6139 2112 dst_cache, info);
e5d4b29f 2113 if (IS_ERR(ndst)) {
e4c7ed41
CW		 2114 netdev_dbg(dev, "no route to %pI6\n",
2115 &dst->sin6.sin6_addr);
2116 dev->stats.tx_carrier_errors++;
9dcc71e1 2117 goto tx_error;
e4c7ed41 2118 }
d342894c 2119
e4c7ed41
CW		 2120 if (ndst->dev == dev) {
2121 netdev_dbg(dev, "circular route to %pI6\n",
2122 &dst->sin6.sin6_addr);
2123 dst_release(ndst);
2124 dev->stats.collisions++;
2125 goto tx_error;
2126 }
0e6fbc5b 2127
e4c7ed41 2128 /* Bypass encapsulation if the destination is local */
6f264e47
JB		 2129 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2130 if (rt6i_flags & RTF_LOCAL &&
2131 !(rt6i_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
e4c7ed41
CW		 2132 struct vxlan_dev *dst_vxlan;
2133
2134 dst_release(ndst);
19ca9fc1 2135 dst_vxlan = vxlan_find_vni(vxlan->net, vni,
ac5132d1
TG		 2136 dst->sa.sa_family, dst_port,
2137 vxlan->flags);
e4c7ed41
CW		 2138 if (!dst_vxlan)
2139 goto tx_error;
2140 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2141 return;
2142 }
49560532 2143
b4ed5cad
JB		 2144 if (!info)
2145 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
35e2d115 2146
1400615d 2147 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
e4c7ed41 2148 ttl = ttl ? : ip6_dst_hoplimit(ndst);
f491e56d
JB		 2149 skb_scrub_packet(skb, xnet);
2150 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
54bfd872 2151 vni, md, flags, udp_sum);
f491e56d
JB		 2152 if (err < 0) {
2153 dst_release(ndst);
2154 return;
2155 }
2156 udp_tunnel6_xmit_skb(ndst, sk, skb, dev,
e7f70af1
DB		 2157 &saddr, &dst->sin6.sin6_addr, tos, ttl,
2158 label, src_port, dst_port, !udp_sum);
e4c7ed41
CW		 2159#endif
2160 }
0e6fbc5b 2161
4ad16930 2162 return;
d342894c 2163
2164drop:
2165 dev->stats.tx_dropped++;
2166 goto tx_free;
2167
f491e56d
JB		 2168xmit_tx_error:
2169 /* skb is already freed. */
2170 skb = NULL;
49560532
PS		 2171rt_tx_error:
2172 ip_rt_put(rt);
d342894c 2173tx_error:
2174 dev->stats.tx_errors++;
2175tx_free:
2176 dev_kfree_skb(skb);
d342894c 2177}
2178
6681712d
DS		 2179/* Transmit local packets over Vxlan
2180 *
2181 * Outer IP header inherits ECN and DF from inner header.
2182 * Outer UDP destination is the VXLAN assigned port.
2183 * source port is based on hash of flow
2184 */
2185static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2186{
2187 struct vxlan_dev *vxlan = netdev_priv(dev);
3093fbe7 2188 const struct ip_tunnel_info *info;
6681712d
DS		 2189 struct ethhdr *eth;
2190 bool did_rsc = false;
8f646c92 2191 struct vxlan_rdst *rdst, *fdst = NULL;
6681712d 2192 struct vxlan_fdb *f;
6681712d 2193
61adedf3 2194 info = skb_tunnel_info(skb);
3093fbe7 2195
6681712d 2196 skb_reset_mac_header(skb);
6681712d 2197
47e5d1b0
JB		 2198 if (vxlan->flags & VXLAN_F_COLLECT_METADATA) {
2199 if (info && info->mode & IP_TUNNEL_INFO_TX)
2200 vxlan_xmit_one(skb, dev, NULL, false);
2201 else
2202 kfree_skb(skb);
2203 return NETDEV_TX_OK;
2204 }
2205
2206 if (vxlan->flags & VXLAN_F_PROXY) {
2207 eth = eth_hdr(skb);
f564f45c
CW		 2208 if (ntohs(eth->h_proto) == ETH_P_ARP)
2209 return arp_reduce(dev, skb);
2210#if IS_ENABLED(CONFIG_IPV6)
2211 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
91269e39
LR		 2212 pskb_may_pull(skb, sizeof(struct ipv6hdr)
2213 + sizeof(struct nd_msg)) &&
f564f45c
CW		 2214 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2215 struct nd_msg *msg;
2216
2217 msg = (struct nd_msg *)skb_transport_header(skb);
2218 if (msg->icmph.icmp6_code == 0 &&
2219 msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2220 return neigh_reduce(dev, skb);
2221 }
2222#endif
2223 }
6681712d 2224
47e5d1b0 2225 eth = eth_hdr(skb);
6681712d 2226 f = vxlan_find_mac(vxlan, eth->h_dest);
ae884082
DS		 2227 did_rsc = false;
2228
2229 if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
e15a00aa
CW		 2230 (ntohs(eth->h_proto) == ETH_P_IP ||
2231 ntohs(eth->h_proto) == ETH_P_IPV6)) {
ae884082
DS		 2232 did_rsc = route_shortcircuit(dev, skb);
2233 if (did_rsc)
2234 f = vxlan_find_mac(vxlan, eth->h_dest);
2235 }
2236
6681712d 2237 if (f == NULL) {
afbd8bae
MR		 2238 f = vxlan_find_mac(vxlan, all_zeros_mac);
2239 if (f == NULL) {
2240 if ((vxlan->flags & VXLAN_F_L2MISS) &&
2241 !is_multicast_ether_addr(eth->h_dest))
2242 vxlan_fdb_miss(vxlan, eth->h_dest);
2243
2244 dev->stats.tx_dropped++;
8f646c92 2245 kfree_skb(skb);
afbd8bae
MR		 2246 return NETDEV_TX_OK;
2247 }
2248 }
6681712d 2249
afbd8bae
MR		 2250 list_for_each_entry_rcu(rdst, &f->remotes, list) {
2251 struct sk_buff *skb1;
6681712d 2252
8f646c92
ED		 2253 if (!fdst) {
2254 fdst = rdst;
2255 continue;
2256 }
afbd8bae
MR		 2257 skb1 = skb_clone(skb, GFP_ATOMIC);
2258 if (skb1)
2259 vxlan_xmit_one(skb1, dev, rdst, did_rsc);
6681712d
DS		 2260 }
2261
8f646c92
ED		 2262 if (fdst)
2263 vxlan_xmit_one(skb, dev, fdst, did_rsc);
2264 else
2265 kfree_skb(skb);
4ad16930 2266 return NETDEV_TX_OK;
6681712d
DS		 2267}
2268
d342894c 2269/* Walk the forwarding table and purge stale entries */
2270static void vxlan_cleanup(unsigned long arg)
2271{
2272 struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
2273 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2274 unsigned int h;
2275
2276 if (!netif_running(vxlan->dev))
2277 return;
2278
d342894c 2279 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2280 struct hlist_node *p, *n;
14e1d0fa
SD		 2281
2282 spin_lock_bh(&vxlan->hash_lock);
d342894c 2283 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2284 struct vxlan_fdb *f
2285 = container_of(p, struct vxlan_fdb, hlist);
2286 unsigned long timeout;
2287
3c172868 2288 if (f->state & NUD_PERMANENT)
d342894c 2289 continue;
2290
0dfbdf41 2291 timeout = f->used + vxlan->cfg.age_interval * HZ;
d342894c 2292 if (time_before_eq(timeout, jiffies)) {
2293 netdev_dbg(vxlan->dev,
2294 "garbage collect %pM\n",
2295 f->eth_addr);
2296 f->state = NUD_STALE;
2297 vxlan_fdb_destroy(vxlan, f);
2298 } else if (time_before(timeout, next_timer))
2299 next_timer = timeout;
2300 }
14e1d0fa 2301 spin_unlock_bh(&vxlan->hash_lock);
d342894c 2302 }
d342894c 2303
2304 mod_timer(&vxlan->age_timer, next_timer);
2305}
2306
9c2e24e1
PS		 2307static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
2308{
56ef9c90 2309 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
54bfd872 2310 __be32 vni = vxlan->default_dst.remote_vni;
9c2e24e1 2311
56ef9c90 2312 spin_lock(&vn->sock_lock);
9c2e24e1 2313 hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
56ef9c90 2314 spin_unlock(&vn->sock_lock);
9c2e24e1
PS		 2315}
2316
d342894c 2317/* Setup stats when device is created */
2318static int vxlan_init(struct net_device *dev)
2319{
1c213bd2 2320 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
e8171045 2321 if (!dev->tstats)
d342894c 2322 return -ENOMEM;
2323
2324 return 0;
2325}
2326
ba609e9b 2327static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
afbd8bae
MR		 2328{
2329 struct vxlan_fdb *f;
2330
2331 spin_lock_bh(&vxlan->hash_lock);
2332 f = __vxlan_find_mac(vxlan, all_zeros_mac);
2333 if (f)
2334 vxlan_fdb_destroy(vxlan, f);
2335 spin_unlock_bh(&vxlan->hash_lock);
2336}
2337
ebf4063e
SH		 2338static void vxlan_uninit(struct net_device *dev)
2339{
2340 struct vxlan_dev *vxlan = netdev_priv(dev);
ebf4063e 2341
ba609e9b 2342 vxlan_fdb_delete_default(vxlan);
afbd8bae 2343
ebf4063e
SH		 2344 free_percpu(dev->tstats);
2345}
2346
d342894c 2347/* Start ageing timer and join group when device is brought up */
2348static int vxlan_open(struct net_device *dev)
2349{
2350 struct vxlan_dev *vxlan = netdev_priv(dev);
205f356d 2351 int ret;
56ef9c90 2352
205f356d
JB		 2353 ret = vxlan_sock_add(vxlan);
2354 if (ret < 0)
2355 return ret;
d342894c 2356
79d4a94f 2357 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
56ef9c90 2358 ret = vxlan_igmp_join(vxlan);
bef0057b
MRL		 2359 if (ret == -EADDRINUSE)
2360 ret = 0;
56ef9c90 2361 if (ret) {
205f356d 2362 vxlan_sock_release(vxlan);
56ef9c90
MRL		 2363 return ret;
2364 }
d342894c 2365 }
2366
0dfbdf41 2367 if (vxlan->cfg.age_interval)
d342894c 2368 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2369
56ef9c90 2370 return ret;
d342894c 2371}
2372
2373/* Purge the forwarding table */
2374static void vxlan_flush(struct vxlan_dev *vxlan)
2375{
31fec5aa 2376 unsigned int h;
d342894c 2377
2378 spin_lock_bh(&vxlan->hash_lock);
2379 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2380 struct hlist_node *p, *n;
2381 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2382 struct vxlan_fdb *f
2383 = container_of(p, struct vxlan_fdb, hlist);
afbd8bae
MR		 2384 /* the all_zeros_mac entry is deleted at vxlan_uninit */
2385 if (!is_zero_ether_addr(f->eth_addr))
2386 vxlan_fdb_destroy(vxlan, f);
d342894c 2387 }
2388 }
2389 spin_unlock_bh(&vxlan->hash_lock);
2390}
2391
2392/* Cleanup timer and forwarding table on shutdown */
2393static int vxlan_stop(struct net_device *dev)
2394{
2395 struct vxlan_dev *vxlan = netdev_priv(dev);
f01ec1c0 2396 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
56ef9c90 2397 int ret = 0;
d342894c 2398
24c0e683 2399 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
f13b1689 2400 !vxlan_group_used(vn, vxlan))
56ef9c90 2401 ret = vxlan_igmp_leave(vxlan);
d342894c 2402
2403 del_timer_sync(&vxlan->age_timer);
2404
2405 vxlan_flush(vxlan);
205f356d 2406 vxlan_sock_release(vxlan);
d342894c 2407
56ef9c90 2408 return ret;
d342894c 2409}
2410
d342894c 2411/* Stub, nothing needs to be done. */
2412static void vxlan_set_multicast_list(struct net_device *dev)
2413{
2414}
2415
72564b59
DW		 2416static int __vxlan_change_mtu(struct net_device *dev,
2417 struct net_device *lowerdev,
2418 struct vxlan_rdst *dst, int new_mtu, bool strict)
345010b5 2419{
72564b59 2420 int max_mtu = IP_MAX_MTU;
345010b5 2421
72564b59
DW		 2422 if (lowerdev)
2423 max_mtu = lowerdev->mtu;
345010b5
DB		 2424
2425 if (dst->remote_ip.sa.sa_family == AF_INET6)
72564b59 2426 max_mtu -= VXLAN6_HEADROOM;
345010b5 2427 else
72564b59 2428 max_mtu -= VXLAN_HEADROOM;
345010b5 2429
72564b59 2430 if (new_mtu < 68)
345010b5
DB		 2431 return -EINVAL;
2432
72564b59
DW		 2433 if (new_mtu > max_mtu) {
2434 if (strict)
2435 return -EINVAL;
2436
2437 new_mtu = max_mtu;
2438 }
2439
345010b5
DB		 2440 dev->mtu = new_mtu;
2441 return 0;
2442}
2443
72564b59
DW		 2444static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2445{
2446 struct vxlan_dev *vxlan = netdev_priv(dev);
2447 struct vxlan_rdst *dst = &vxlan->default_dst;
2448 struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
2449 dst->remote_ifindex);
2450 return __vxlan_change_mtu(dev, lowerdev, dst, new_mtu, true);
2451}
2452
fc4099f1
PS		 2453static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
2454{
2455 struct vxlan_dev *vxlan = netdev_priv(dev);
2456 struct ip_tunnel_info *info = skb_tunnel_info(skb);
2457 __be16 sport, dport;
2458
2459 sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2460 vxlan->cfg.port_max, true);
2461 dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
2462
239e944f 2463 if (ip_tunnel_info_af(info) == AF_INET) {
1a8496ba
JB		 2464 struct rtable *rt;
2465
239e944f
JB		 2466 if (!vxlan->vn4_sock)
2467 return -EINVAL;
1a8496ba
JB		 2468 rt = vxlan_get_route(vxlan, skb, 0, info->key.tos,
2469 info->key.u.ipv4.dst,
0c1d70af 2470 &info->key.u.ipv4.src, NULL, info);
1a8496ba
JB		 2471 if (IS_ERR(rt))
2472 return PTR_ERR(rt);
2473 ip_rt_put(rt);
239e944f
JB		 2474 } else {
2475#if IS_ENABLED(CONFIG_IPV6)
2476 struct dst_entry *ndst;
2477
2478 if (!vxlan->vn6_sock)
2479 return -EINVAL;
1400615d 2480 ndst = vxlan6_get_route(vxlan, skb, 0, info->key.tos,
e7f70af1 2481 info->key.label, &info->key.u.ipv6.dst,
db3c6139 2482 &info->key.u.ipv6.src, NULL, info);
239e944f
JB		 2483 if (IS_ERR(ndst))
2484 return PTR_ERR(ndst);
2485 dst_release(ndst);
239e944f
JB		 2486#else /* !CONFIG_IPV6 */
2487 return -EPFNOSUPPORT;
2488#endif
2489 }
1a8496ba
JB		 2490 info->key.tp_src = sport;
2491 info->key.tp_dst = dport;
239e944f 2492 return 0;
fc4099f1
PS		 2493}
2494
0c867c9b 2495static const struct net_device_ops vxlan_netdev_ether_ops = {
d342894c 2496 .ndo_init = vxlan_init,
ebf4063e 2497 .ndo_uninit = vxlan_uninit,
d342894c 2498 .ndo_open = vxlan_open,
2499 .ndo_stop = vxlan_stop,
2500 .ndo_start_xmit = vxlan_xmit,
e8171045 2501 .ndo_get_stats64 = ip_tunnel_get_stats64,
d342894c 2502 .ndo_set_rx_mode = vxlan_set_multicast_list,
345010b5 2503 .ndo_change_mtu = vxlan_change_mtu,
d342894c 2504 .ndo_validate_addr = eth_validate_addr,
2505 .ndo_set_mac_address = eth_mac_addr,
2506 .ndo_fdb_add = vxlan_fdb_add,
2507 .ndo_fdb_del = vxlan_fdb_delete,
2508 .ndo_fdb_dump = vxlan_fdb_dump,
fc4099f1 2509 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
d342894c 2510};
2511
e1e5314d
JB		 2512static const struct net_device_ops vxlan_netdev_raw_ops = {
2513 .ndo_init = vxlan_init,
2514 .ndo_uninit = vxlan_uninit,
2515 .ndo_open = vxlan_open,
2516 .ndo_stop = vxlan_stop,
2517 .ndo_start_xmit = vxlan_xmit,
2518 .ndo_get_stats64 = ip_tunnel_get_stats64,
2519 .ndo_change_mtu = vxlan_change_mtu,
2520 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
2521};
2522
d342894c 2523/* Info for udev, that this is a virtual tunnel endpoint */
2524static struct device_type vxlan_type = {
2525 .name = "vxlan",
2526};
2527
53cf5275 2528/* Calls the ndo_add_vxlan_port of the caller in order to
35e42379
JG		 2529 * supply the listening VXLAN udp ports. Callers are expected
2530 * to implement the ndo_add_vxlan_port.
53cf5275 2531 */
b7aade15 2532static void vxlan_push_rx_ports(struct net_device *dev)
53cf5275
JG		 2533{
2534 struct vxlan_sock *vs;
2535 struct net *net = dev_net(dev);
2536 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2537 sa_family_t sa_family;
35e42379
JG		 2538 __be16 port;
2539 unsigned int i;
53cf5275 2540
b7aade15
HFS		 2541 if (!dev->netdev_ops->ndo_add_vxlan_port)
2542 return;
2543
53cf5275
JG		 2544 spin_lock(&vn->sock_lock);
2545 for (i = 0; i < PORT_HASH_SIZE; ++i) {
35e42379
JG		 2546 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2547 port = inet_sk(vs->sock->sk)->inet_sport;
705cc62f 2548 sa_family = vxlan_get_sk_family(vs);
53cf5275
JG		 2549 dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
2550 port);
2551 }
2552 }
2553 spin_unlock(&vn->sock_lock);
2554}
53cf5275 2555
d342894c 2556/* Initialize the device structure. */
2557static void vxlan_setup(struct net_device *dev)
2558{
2559 struct vxlan_dev *vxlan = netdev_priv(dev);
31fec5aa 2560 unsigned int h;
d342894c 2561
65226ef8
JB		 2562 eth_hw_addr_random(dev);
2563 ether_setup(dev);
2564
ebf4063e 2565 dev->destructor = free_netdev;
d342894c 2566 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2567
d342894c 2568 dev->features |= NETIF_F_LLTX;
d6727fe3 2569 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
0afb1666 2570 dev->features |= NETIF_F_RXCSUM;
05c0db08 2571 dev->features |= NETIF_F_GSO_SOFTWARE;
0afb1666 2572
1eaa8178
PS		 2573 dev->vlan_features = dev->features;
2574 dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
0afb1666 2575 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
05c0db08 2576 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1eaa8178 2577 dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
02875878 2578 netif_keep_dst(dev);
0c867c9b 2579 dev->priv_flags |= IFF_NO_QUEUE;
d342894c 2580
553675fb 2581 INIT_LIST_HEAD(&vxlan->next);
d342894c 2582 spin_lock_init(&vxlan->hash_lock);
2583
2584 init_timer_deferrable(&vxlan->age_timer);
2585 vxlan->age_timer.function = vxlan_cleanup;
2586 vxlan->age_timer.data = (unsigned long) vxlan;
2587
0dfbdf41 2588 vxlan->cfg.dst_port = htons(vxlan_port);
05f47d69 2589
d342894c 2590 vxlan->dev = dev;
2591
58ce31cc
TH		 2592 gro_cells_init(&vxlan->gro_cells, dev);
2593
d342894c 2594 for (h = 0; h < FDB_HASH_SIZE; ++h)
2595 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2596}
2597
0c867c9b
JB		 2598static void vxlan_ether_setup(struct net_device *dev)
2599{
0c867c9b
JB		 2600 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2601 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2602 dev->netdev_ops = &vxlan_netdev_ether_ops;
2603}
2604
e1e5314d
JB		 2605static void vxlan_raw_setup(struct net_device *dev)
2606{
65226ef8 2607 dev->header_ops = NULL;
e1e5314d
JB		 2608 dev->type = ARPHRD_NONE;
2609 dev->hard_header_len = 0;
2610 dev->addr_len = 0;
e1e5314d
JB		 2611 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
2612 dev->netdev_ops = &vxlan_netdev_raw_ops;
2613}
2614
d342894c 2615static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2616 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
5d174dd8 2617 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
e4c7ed41 2618 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
d342894c 2619 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
2620 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
e4c7ed41 2621 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
d342894c 2622 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
2623 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
e7f70af1 2624 [IFLA_VXLAN_LABEL] = { .type = NLA_U32 },
d342894c 2625 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
2626 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
2627 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
05f47d69 2628 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
e4f67add
DS		 2629 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
2630 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
2631 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
2632 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
f8a9b1bc 2633 [IFLA_VXLAN_COLLECT_METADATA] = { .type = NLA_U8 },
823aa873 2634 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
5c91ae08
TH		 2635 [IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 },
2636 [IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
2637 [IFLA_VXLAN_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
dfd8645e
TH		 2638 [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2639 [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
3511494c 2640 [IFLA_VXLAN_GBP] = { .type = NLA_FLAG, },
e1e5314d 2641 [IFLA_VXLAN_GPE] = { .type = NLA_FLAG, },
0ace2ca8 2642 [IFLA_VXLAN_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG },
d342894c 2643};
2644
2645static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2646{
2647 if (tb[IFLA_ADDRESS]) {
2648 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2649 pr_debug("invalid link address (not ethernet)\n");
2650 return -EINVAL;
2651 }
2652
2653 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2654 pr_debug("invalid all zero ethernet address\n");
2655 return -EADDRNOTAVAIL;
2656 }
2657 }
2658
2659 if (!data)
2660 return -EINVAL;
2661
2662 if (data[IFLA_VXLAN_ID]) {
2663 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2664 if (id >= VXLAN_VID_MASK)
2665 return -ERANGE;
2666 }
2667
05f47d69 2668 if (data[IFLA_VXLAN_PORT_RANGE]) {
2669 const struct ifla_vxlan_port_range *p
2670 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2671
2672 if (ntohs(p->high) < ntohs(p->low)) {
2673 pr_debug("port range %u .. %u not valid\n",
2674 ntohs(p->low), ntohs(p->high));
2675 return -EINVAL;
2676 }
2677 }
2678
d342894c 2679 return 0;
2680}
2681
1b13c97f
YB		 2682static void vxlan_get_drvinfo(struct net_device *netdev,
2683 struct ethtool_drvinfo *drvinfo)
2684{
2685 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2686 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2687}
2688
2689static const struct ethtool_ops vxlan_ethtool_ops = {
2690 .get_drvinfo = vxlan_get_drvinfo,
2691 .get_link = ethtool_op_get_link,
2692};
2693
3ee64f39
TH		 2694static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2695 __be16 port, u32 flags)
553675fb 2696{
e4c7ed41 2697 struct socket *sock;
3ee64f39
TH		 2698 struct udp_port_cfg udp_conf;
2699 int err;
e4c7ed41 2700
3ee64f39 2701 memset(&udp_conf, 0, sizeof(udp_conf));
e4c7ed41 2702
3ee64f39
TH		 2703 if (ipv6) {
2704 udp_conf.family = AF_INET6;
3ee64f39 2705 udp_conf.use_udp6_rx_checksums =
3dc2b6a8 2706 !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
a43a9ef6 2707 udp_conf.ipv6_v6only = 1;
3ee64f39
TH		 2708 } else {
2709 udp_conf.family = AF_INET;
e4c7ed41 2710 }
e4c7ed41 2711
3ee64f39 2712 udp_conf.local_udp_port = port;
553675fb 2713
3ee64f39
TH		 2714 /* Open UDP socket */
2715 err = udp_sock_create(net, &udp_conf, &sock);
2716 if (err < 0)
2717 return ERR_PTR(err);
e4c7ed41 2718
39deb2c7 2719 return sock;
e4c7ed41
CW		 2720}
2721
2722/* Create new listen socket if needed */
b1be00a6
JB		 2723static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
2724 __be16 port, u32 flags)
e4c7ed41
CW		 2725{
2726 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2727 struct vxlan_sock *vs;
2728 struct socket *sock;
e4c7ed41 2729 unsigned int h;
acbf74a7 2730 struct udp_tunnel_sock_cfg tunnel_cfg;
e4c7ed41 2731
dc01e7d3 2732 vs = kzalloc(sizeof(*vs), GFP_KERNEL);
e4c7ed41
CW		 2733 if (!vs)
2734 return ERR_PTR(-ENOMEM);
2735
2736 for (h = 0; h < VNI_HASH_SIZE; ++h)
2737 INIT_HLIST_HEAD(&vs->vni_list[h]);
2738
3ee64f39 2739 sock = vxlan_create_sock(net, ipv6, port, flags);
39deb2c7 2740 if (IS_ERR(sock)) {
56ef9c90
MRL		 2741 pr_info("Cannot bind port %d, err=%ld\n", ntohs(port),
2742 PTR_ERR(sock));
553675fb 2743 kfree(vs);
e50fddc8 2744 return ERR_CAST(sock);
553675fb 2745 }
e4c7ed41
CW		 2746
2747 vs->sock = sock;
9c2e24e1 2748 atomic_set(&vs->refcnt, 1);
af33c1ad 2749 vs->flags = (flags & VXLAN_F_RCV_FLAGS);
553675fb 2750
9c2e24e1
PS		 2751 spin_lock(&vn->sock_lock);
2752 hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
dc01e7d3 2753 vxlan_notify_add_rx_port(vs);
9c2e24e1 2754 spin_unlock(&vn->sock_lock);
553675fb 2755
2756 /* Mark socket as an encapsulation socket. */
5602c48c 2757 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
acbf74a7
AZ		 2758 tunnel_cfg.sk_user_data = vs;
2759 tunnel_cfg.encap_type = 1;
f2d1968e 2760 tunnel_cfg.encap_rcv = vxlan_rcv;
acbf74a7 2761 tunnel_cfg.encap_destroy = NULL;
5602c48c
TH		 2762 tunnel_cfg.gro_receive = vxlan_gro_receive;
2763 tunnel_cfg.gro_complete = vxlan_gro_complete;
acbf74a7
AZ		 2764
2765 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
e4c7ed41 2766
9c2e24e1
PS		 2767 return vs;
2768}
2769
b1be00a6 2770static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
9c2e24e1 2771{
205f356d
JB		 2772 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2773 struct vxlan_sock *vs = NULL;
9c2e24e1 2774
205f356d 2775 if (!vxlan->cfg.no_share) {
56ef9c90 2776 spin_lock(&vn->sock_lock);
205f356d
JB		 2777 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
2778 vxlan->cfg.dst_port, vxlan->flags);
2779 if (vs && !atomic_add_unless(&vs->refcnt, 1, 0)) {
56ef9c90 2780 spin_unlock(&vn->sock_lock);
205f356d 2781 return -EBUSY;
56ef9c90
MRL		 2782 }
2783 spin_unlock(&vn->sock_lock);
2784 }
205f356d 2785 if (!vs)
b1be00a6
JB		 2786 vs = vxlan_socket_create(vxlan->net, ipv6,
2787 vxlan->cfg.dst_port, vxlan->flags);
205f356d
JB		 2788 if (IS_ERR(vs))
2789 return PTR_ERR(vs);
b1be00a6
JB		 2790#if IS_ENABLED(CONFIG_IPV6)
2791 if (ipv6)
2792 vxlan->vn6_sock = vs;
2793 else
2794#endif
2795 vxlan->vn4_sock = vs;
205f356d
JB		 2796 vxlan_vs_add_dev(vs, vxlan);
2797 return 0;
553675fb 2798}
2799
b1be00a6
JB		 2800static int vxlan_sock_add(struct vxlan_dev *vxlan)
2801{
2802 bool ipv6 = vxlan->flags & VXLAN_F_IPV6;
2803 bool metadata = vxlan->flags & VXLAN_F_COLLECT_METADATA;
2804 int ret = 0;
2805
2806 vxlan->vn4_sock = NULL;
2807#if IS_ENABLED(CONFIG_IPV6)
2808 vxlan->vn6_sock = NULL;
2809 if (ipv6 || metadata)
2810 ret = __vxlan_sock_add(vxlan, true);
2811#endif
2812 if (!ret && (!ipv6 || metadata))
2813 ret = __vxlan_sock_add(vxlan, false);
2814 if (ret < 0)
2815 vxlan_sock_release(vxlan);
2816 return ret;
2817}
2818
0dfbdf41
TG		 2819static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
2820 struct vxlan_config *conf)
d342894c 2821{
33564bbb 2822 struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
07b9b37c 2823 struct vxlan_dev *vxlan = netdev_priv(dev), *tmp;
c7995c43 2824 struct vxlan_rdst *dst = &vxlan->default_dst;
b1be00a6 2825 unsigned short needed_headroom = ETH_HLEN;
d342894c 2826 int err;
e4c7ed41 2827 bool use_ipv6 = false;
0dfbdf41 2828 __be16 default_port = vxlan->cfg.dst_port;
7e059158 2829 struct net_device *lowerdev = NULL;
d342894c 2830
e1e5314d
JB		 2831 if (conf->flags & VXLAN_F_GPE) {
2832 if (conf->flags & ~VXLAN_F_ALLOWED_GPE)
2833 return -EINVAL;
2834 /* For now, allow GPE only together with COLLECT_METADATA.
2835 * This can be relaxed later; in such case, the other side
2836 * of the PtP link will have to be provided.
2837 */
2838 if (!(conf->flags & VXLAN_F_COLLECT_METADATA))
2839 return -EINVAL;
2840
2841 vxlan_raw_setup(dev);
2842 } else {
2843 vxlan_ether_setup(dev);
2844 }
0c867c9b 2845
33564bbb 2846 vxlan->net = src_net;
f01ec1c0 2847
0dfbdf41 2848 dst->remote_vni = conf->vni;
d342894c 2849
0dfbdf41 2850 memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
d342894c 2851
0dfbdf41
TG		 2852 /* Unless IPv6 is explicitly requested, assume IPv4 */
2853 if (!dst->remote_ip.sa.sa_family)
2854 dst->remote_ip.sa.sa_family = AF_INET;
e4c7ed41 2855
0dfbdf41 2856 if (dst->remote_ip.sa.sa_family == AF_INET6 ||
057ba29b
JB		 2857 vxlan->cfg.saddr.sa.sa_family == AF_INET6) {
2858 if (!IS_ENABLED(CONFIG_IPV6))
2859 return -EPFNOSUPPORT;
e4c7ed41 2860 use_ipv6 = true;
b1be00a6 2861 vxlan->flags |= VXLAN_F_IPV6;
057ba29b 2862 }
d342894c 2863
e7f70af1
DB		 2864 if (conf->label && !use_ipv6) {
2865 pr_info("label only supported in use with IPv6\n");
2866 return -EINVAL;
2867 }
2868
0dfbdf41 2869 if (conf->remote_ifindex) {
7e059158 2870 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
0dfbdf41 2871 dst->remote_ifindex = conf->remote_ifindex;
34e02aa1 2872
2873 if (!lowerdev) {
c7995c43 2874 pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
34e02aa1 2875 return -ENODEV;
2876 }
d342894c 2877
e4c7ed41
CW		 2878#if IS_ENABLED(CONFIG_IPV6)
2879 if (use_ipv6) {
2880 struct inet6_dev *idev = __in6_dev_get(lowerdev);
2881 if (idev && idev->cnf.disable_ipv6) {
2882 pr_info("IPv6 is disabled via sysctl\n");
2883 return -EPERM;
2884 }
e4c7ed41
CW		 2885 }
2886#endif
2887
0dfbdf41 2888 if (!conf->mtu)
e4c7ed41 2889 dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
1ba56fb4 2890
b1be00a6 2891 needed_headroom = lowerdev->hard_header_len;
9dc2ad10 2892 }
d342894c 2893
7e059158
DW		 2894 if (conf->mtu) {
2895 err = __vxlan_change_mtu(dev, lowerdev, dst, conf->mtu, false);
2896 if (err)
2897 return err;
2898 }
2899
b1be00a6
JB		 2900 if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
2901 needed_headroom += VXLAN6_HEADROOM;
2902 else
2903 needed_headroom += VXLAN_HEADROOM;
2904 dev->needed_headroom = needed_headroom;
2905
0dfbdf41 2906 memcpy(&vxlan->cfg, conf, sizeof(*conf));
e1e5314d
JB		 2907 if (!vxlan->cfg.dst_port) {
2908 if (conf->flags & VXLAN_F_GPE)
2909 vxlan->cfg.dst_port = 4790; /* IANA assigned VXLAN-GPE port */
2910 else
2911 vxlan->cfg.dst_port = default_port;
2912 }
0dfbdf41
TG		 2913 vxlan->flags |= conf->flags;
2914
2915 if (!vxlan->cfg.age_interval)
2916 vxlan->cfg.age_interval = FDB_AGE_DEFAULT;
2917
07b9b37c
ND		 2918 list_for_each_entry(tmp, &vn->vxlan_list, next) {
2919 if (tmp->cfg.vni == conf->vni &&
2920 (tmp->default_dst.remote_ip.sa.sa_family == AF_INET6 ||
2921 tmp->cfg.saddr.sa.sa_family == AF_INET6) == use_ipv6 &&
2922 tmp->cfg.dst_port == vxlan->cfg.dst_port &&
2923 (tmp->flags & VXLAN_F_RCV_FLAGS) ==
2924 (vxlan->flags & VXLAN_F_RCV_FLAGS))
0dfbdf41 2925 return -EEXIST;
07b9b37c 2926 }
0dfbdf41
TG		 2927
2928 dev->ethtool_ops = &vxlan_ethtool_ops;
2929
2930 /* create an fdb entry for a valid default destination */
2931 if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2932 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2933 &vxlan->default_dst.remote_ip,
2934 NUD_REACHABLE|NUD_PERMANENT,
2935 NLM_F_EXCL|NLM_F_CREATE,
2936 vxlan->cfg.dst_port,
2937 vxlan->default_dst.remote_vni,
2938 vxlan->default_dst.remote_ifindex,
2939 NTF_SELF);
2940 if (err)
2941 return err;
2942 }
2943
2944 err = register_netdevice(dev);
2945 if (err) {
2946 vxlan_fdb_delete_default(vxlan);
2947 return err;
2948 }
2949
2950 list_add(&vxlan->next, &vn->vxlan_list);
2951
2952 return 0;
2953}
2954
0dfbdf41
TG		 2955static int vxlan_newlink(struct net *src_net, struct net_device *dev,
2956 struct nlattr *tb[], struct nlattr *data[])
2957{
2958 struct vxlan_config conf;
2959 int err;
2960
0dfbdf41 2961 memset(&conf, 0, sizeof(conf));
e277de5f
JG		 2962
2963 if (data[IFLA_VXLAN_ID])
54bfd872 2964 conf.vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
0dfbdf41
TG		 2965
2966 if (data[IFLA_VXLAN_GROUP]) {
2967 conf.remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
2968 } else if (data[IFLA_VXLAN_GROUP6]) {
2969 if (!IS_ENABLED(CONFIG_IPV6))
2970 return -EPFNOSUPPORT;
2971
2972 conf.remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
2973 conf.remote_ip.sa.sa_family = AF_INET6;
2974 }
2975
2976 if (data[IFLA_VXLAN_LOCAL]) {
2977 conf.saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
2978 conf.saddr.sa.sa_family = AF_INET;
2979 } else if (data[IFLA_VXLAN_LOCAL6]) {
2980 if (!IS_ENABLED(CONFIG_IPV6))
2981 return -EPFNOSUPPORT;
2982
2983 /* TODO: respect scope id */
2984 conf.saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
2985 conf.saddr.sa.sa_family = AF_INET6;
2986 }
2987
2988 if (data[IFLA_VXLAN_LINK])
2989 conf.remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
2990
d342894c 2991 if (data[IFLA_VXLAN_TOS])
0dfbdf41 2992 conf.tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
d342894c 2993
afb97186 2994 if (data[IFLA_VXLAN_TTL])
0dfbdf41 2995 conf.ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
afb97186 2996
e7f70af1
DB		 2997 if (data[IFLA_VXLAN_LABEL])
2998 conf.label = nla_get_be32(data[IFLA_VXLAN_LABEL]) &
2999 IPV6_FLOWLABEL_MASK;
3000
d342894c 3001 if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
0dfbdf41 3002 conf.flags |= VXLAN_F_LEARN;
d342894c 3003
3004 if (data[IFLA_VXLAN_AGEING])
0dfbdf41 3005 conf.age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
d342894c 3006
e4f67add 3007 if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
0dfbdf41 3008 conf.flags |= VXLAN_F_PROXY;
e4f67add
DS		 3009
3010 if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
0dfbdf41 3011 conf.flags |= VXLAN_F_RSC;
e4f67add
DS		 3012
3013 if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
0dfbdf41 3014 conf.flags |= VXLAN_F_L2MISS;
e4f67add
DS		 3015
3016 if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
0dfbdf41 3017 conf.flags |= VXLAN_F_L3MISS;
e4f67add 3018
d342894c 3019 if (data[IFLA_VXLAN_LIMIT])
0dfbdf41 3020 conf.addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
d342894c 3021
f8a9b1bc
AS		 3022 if (data[IFLA_VXLAN_COLLECT_METADATA] &&
3023 nla_get_u8(data[IFLA_VXLAN_COLLECT_METADATA]))
3024 conf.flags |= VXLAN_F_COLLECT_METADATA;
3025
05f47d69 3026 if (data[IFLA_VXLAN_PORT_RANGE]) {
3027 const struct ifla_vxlan_port_range *p
3028 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
0dfbdf41
TG		 3029 conf.port_min = ntohs(p->low);
3030 conf.port_max = ntohs(p->high);
05f47d69 3031 }
3032
823aa873 3033 if (data[IFLA_VXLAN_PORT])
0dfbdf41 3034 conf.dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
823aa873 3035
6ceb31ca
AD		 3036 if (data[IFLA_VXLAN_UDP_CSUM] &&
3037 !nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
3038 conf.flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
359a0ea9
TH		 3039
3040 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
3041 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
0dfbdf41 3042 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
359a0ea9
TH		 3043
3044 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
3045 nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
0dfbdf41 3046 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
359a0ea9 3047
dfd8645e
TH		 3048 if (data[IFLA_VXLAN_REMCSUM_TX] &&
3049 nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
0dfbdf41 3050 conf.flags |= VXLAN_F_REMCSUM_TX;
dfd8645e
TH		 3051
3052 if (data[IFLA_VXLAN_REMCSUM_RX] &&
3053 nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
0dfbdf41 3054 conf.flags |= VXLAN_F_REMCSUM_RX;
dfd8645e 3055
3511494c 3056 if (data[IFLA_VXLAN_GBP])
0dfbdf41 3057 conf.flags |= VXLAN_F_GBP;
3511494c 3058
e1e5314d
JB		 3059 if (data[IFLA_VXLAN_GPE])
3060 conf.flags |= VXLAN_F_GPE;
3061
0ace2ca8 3062 if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL])
0dfbdf41 3063 conf.flags |= VXLAN_F_REMCSUM_NOPARTIAL;
0ace2ca8 3064
ce577668
CH		 3065 if (tb[IFLA_MTU])
3066 conf.mtu = nla_get_u32(tb[IFLA_MTU]);
3067
0dfbdf41
TG		 3068 err = vxlan_dev_configure(src_net, dev, &conf);
3069 switch (err) {
3070 case -ENODEV:
3071 pr_info("ifindex %d does not exist\n", conf.remote_ifindex);
3072 break;
1b13c97f 3073
0dfbdf41
TG		 3074 case -EPERM:
3075 pr_info("IPv6 is disabled via sysctl\n");
3076 break;
d342894c 3077
0dfbdf41 3078 case -EEXIST:
54bfd872 3079 pr_info("duplicate VNI %u\n", be32_to_cpu(conf.vni));
0dfbdf41 3080 break;
e1e5314d
JB		 3081
3082 case -EINVAL:
3083 pr_info("unsupported combination of extensions\n");
3084 break;
afbd8bae
MR		 3085 }
3086
0dfbdf41 3087 return err;
d342894c 3088}
3089
3090static void vxlan_dellink(struct net_device *dev, struct list_head *head)
3091{
3092 struct vxlan_dev *vxlan = netdev_priv(dev);
f01ec1c0 3093 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
d342894c 3094
fe5c3561 3095 spin_lock(&vn->sock_lock);
9c2e24e1
PS		 3096 if (!hlist_unhashed(&vxlan->hlist))
3097 hlist_del_rcu(&vxlan->hlist);
fe5c3561 3098 spin_unlock(&vn->sock_lock);
3099
58ce31cc 3100 gro_cells_destroy(&vxlan->gro_cells);
553675fb 3101 list_del(&vxlan->next);
d342894c 3102 unregister_netdevice_queue(dev, head);
3103}
3104
3105static size_t vxlan_get_size(const struct net_device *dev)
3106{
3107
3108 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
e4c7ed41 3109 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
d342894c 3110 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
e4c7ed41 3111 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
d342894c 3112 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
3113 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
e7f70af1 3114 nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */
d342894c 3115 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
e4f67add
DS		 3116 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
3117 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
3118 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
3119 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
da8b43c0 3120 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_COLLECT_METADATA */
d342894c 3121 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
3122 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
05f47d69 3123 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
359a0ea9
TH		 3124 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
3125 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
3126 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
3127 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
dfd8645e
TH		 3128 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
3129 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
d342894c 3130 0;
3131}
3132
3133static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
3134{
3135 const struct vxlan_dev *vxlan = netdev_priv(dev);
c7995c43 3136 const struct vxlan_rdst *dst = &vxlan->default_dst;
05f47d69 3137 struct ifla_vxlan_port_range ports = {
0dfbdf41
TG		 3138 .low = htons(vxlan->cfg.port_min),
3139 .high = htons(vxlan->cfg.port_max),
05f47d69 3140 };
d342894c 3141
54bfd872 3142 if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni)))
d342894c 3143 goto nla_put_failure;
3144
e4c7ed41
CW		 3145 if (!vxlan_addr_any(&dst->remote_ip)) {
3146 if (dst->remote_ip.sa.sa_family == AF_INET) {
930345ea
JB		 3147 if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
3148 dst->remote_ip.sin.sin_addr.s_addr))
e4c7ed41
CW		 3149 goto nla_put_failure;
3150#if IS_ENABLED(CONFIG_IPV6)
3151 } else {
930345ea
JB		 3152 if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
3153 &dst->remote_ip.sin6.sin6_addr))
e4c7ed41
CW		 3154 goto nla_put_failure;
3155#endif
3156 }
3157 }
d342894c 3158
c7995c43 3159 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
d342894c 3160 goto nla_put_failure;
3161
0dfbdf41
TG		 3162 if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
3163 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
930345ea 3164 if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
0dfbdf41 3165 vxlan->cfg.saddr.sin.sin_addr.s_addr))
e4c7ed41
CW		 3166 goto nla_put_failure;
3167#if IS_ENABLED(CONFIG_IPV6)
3168 } else {
930345ea 3169 if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
0dfbdf41 3170 &vxlan->cfg.saddr.sin6.sin6_addr))
e4c7ed41
CW		 3171 goto nla_put_failure;
3172#endif
3173 }
3174 }
d342894c 3175
0dfbdf41
TG		 3176 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
3177 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
e7f70af1 3178 nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) ||
e4f67add
DS		 3179 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
3180 !!(vxlan->flags & VXLAN_F_LEARN)) ||
3181 nla_put_u8(skb, IFLA_VXLAN_PROXY,
3182 !!(vxlan->flags & VXLAN_F_PROXY)) ||
3183 nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
3184 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
3185 !!(vxlan->flags & VXLAN_F_L2MISS)) ||
3186 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
3187 !!(vxlan->flags & VXLAN_F_L3MISS)) ||
da8b43c0
AS		 3188 nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
3189 !!(vxlan->flags & VXLAN_F_COLLECT_METADATA)) ||
0dfbdf41
TG		 3190 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
3191 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
3192 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
359a0ea9 3193 nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
6ceb31ca 3194 !(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
359a0ea9
TH		 3195 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
3196 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
3197 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
dfd8645e
TH		 3198 !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
3199 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
3200 !!(vxlan->flags & VXLAN_F_REMCSUM_TX)) ||
3201 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
3202 !!(vxlan->flags & VXLAN_F_REMCSUM_RX)))
d342894c 3203 goto nla_put_failure;
3204
05f47d69 3205 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
3206 goto nla_put_failure;
3207
3511494c
TG		 3208 if (vxlan->flags & VXLAN_F_GBP &&
3209 nla_put_flag(skb, IFLA_VXLAN_GBP))
3210 goto nla_put_failure;
3211
e1e5314d
JB		 3212 if (vxlan->flags & VXLAN_F_GPE &&
3213 nla_put_flag(skb, IFLA_VXLAN_GPE))
3214 goto nla_put_failure;
3215
0ace2ca8
TH		 3216 if (vxlan->flags & VXLAN_F_REMCSUM_NOPARTIAL &&
3217 nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
3218 goto nla_put_failure;
3219
d342894c 3220 return 0;
3221
3222nla_put_failure:
3223 return -EMSGSIZE;
3224}
3225
1728d4fa
ND		 3226static struct net *vxlan_get_link_net(const struct net_device *dev)
3227{
3228 struct vxlan_dev *vxlan = netdev_priv(dev);
3229
3230 return vxlan->net;
3231}
3232
d342894c 3233static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
3234 .kind = "vxlan",
3235 .maxtype = IFLA_VXLAN_MAX,
3236 .policy = vxlan_policy,
3237 .priv_size = sizeof(struct vxlan_dev),
3238 .setup = vxlan_setup,
3239 .validate = vxlan_validate,
3240 .newlink = vxlan_newlink,
3241 .dellink = vxlan_dellink,
3242 .get_size = vxlan_get_size,
3243 .fill_info = vxlan_fill_info,
1728d4fa 3244 .get_link_net = vxlan_get_link_net,
d342894c 3245};
3246
cf5da330
ND		 3247struct net_device *vxlan_dev_create(struct net *net, const char *name,
3248 u8 name_assign_type,
3249 struct vxlan_config *conf)
3250{
3251 struct nlattr *tb[IFLA_MAX + 1];
3252 struct net_device *dev;
3253 int err;
3254
3255 memset(&tb, 0, sizeof(tb));
3256
3257 dev = rtnl_create_link(net, name, name_assign_type,
3258 &vxlan_link_ops, tb);
3259 if (IS_ERR(dev))
3260 return dev;
3261
3262 err = vxlan_dev_configure(net, dev, conf);
3263 if (err < 0) {
3264 free_netdev(dev);
3265 return ERR_PTR(err);
3266 }
3267
3268 err = rtnl_configure_link(dev, NULL);
3269 if (err < 0) {
3270 LIST_HEAD(list_kill);
3271
3272 vxlan_dellink(dev, &list_kill);
3273 unregister_netdevice_many(&list_kill);
3274 return ERR_PTR(err);
3275 }
3276
3277 return dev;
3278}
3279EXPORT_SYMBOL_GPL(vxlan_dev_create);
3280
acaf4e70
DB		 3281static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
3282 struct net_device *dev)
3283{
3284 struct vxlan_dev *vxlan, *next;
3285 LIST_HEAD(list_kill);
3286
3287 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3288 struct vxlan_rdst *dst = &vxlan->default_dst;
3289
3290 /* In case we created vxlan device with carrier
3291 * and we loose the carrier due to module unload
3292 * we also need to remove vxlan device. In other
3293 * cases, it's not necessary and remote_ifindex
3294 * is 0 here, so no matches.
3295 */
3296 if (dst->remote_ifindex == dev->ifindex)
3297 vxlan_dellink(vxlan->dev, &list_kill);
3298 }
3299
3300 unregister_netdevice_many(&list_kill);
3301}
3302
b7aade15
HFS		 3303static int vxlan_netdevice_event(struct notifier_block *unused,
3304 unsigned long event, void *ptr)
acaf4e70
DB		 3305{
3306 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
783c1463 3307 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
acaf4e70 3308
783c1463 3309 if (event == NETDEV_UNREGISTER)
acaf4e70 3310 vxlan_handle_lowerdev_unregister(vn, dev);
b7aade15
HFS		 3311 else if (event == NETDEV_OFFLOAD_PUSH_VXLAN)
3312 vxlan_push_rx_ports(dev);
acaf4e70
DB		 3313
3314 return NOTIFY_DONE;
3315}
3316
3317static struct notifier_block vxlan_notifier_block __read_mostly = {
b7aade15 3318 .notifier_call = vxlan_netdevice_event,
acaf4e70
DB		 3319};
3320
d342894c 3321static __net_init int vxlan_init_net(struct net *net)
3322{
3323 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
31fec5aa 3324 unsigned int h;
d342894c 3325
553675fb 3326 INIT_LIST_HEAD(&vn->vxlan_list);
1c51a915 3327 spin_lock_init(&vn->sock_lock);
d342894c 3328
553675fb 3329 for (h = 0; h < PORT_HASH_SIZE; ++h)
3330 INIT_HLIST_HEAD(&vn->sock_list[h]);
d342894c 3331
3332 return 0;
3333}
3334
f01ec1c0
ND		 3335static void __net_exit vxlan_exit_net(struct net *net)
3336{
3337 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3338 struct vxlan_dev *vxlan, *next;
3339 struct net_device *dev, *aux;
3340 LIST_HEAD(list);
3341
3342 rtnl_lock();
3343 for_each_netdev_safe(net, dev, aux)
3344 if (dev->rtnl_link_ops == &vxlan_link_ops)
3345 unregister_netdevice_queue(dev, &list);
3346
3347 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3348 /* If vxlan->dev is in the same netns, it has already been added
3349 * to the list by the previous loop.
3350 */
58ce31cc
TH		 3351 if (!net_eq(dev_net(vxlan->dev), net)) {
3352 gro_cells_destroy(&vxlan->gro_cells);
13c3ed6a 3353 unregister_netdevice_queue(vxlan->dev, &list);
58ce31cc 3354 }
f01ec1c0
ND		 3355 }
3356
3357 unregister_netdevice_many(&list);
3358 rtnl_unlock();
3359}
3360
d342894c 3361static struct pernet_operations vxlan_net_ops = {
3362 .init = vxlan_init_net,
f01ec1c0 3363 .exit = vxlan_exit_net,
d342894c 3364 .id = &vxlan_net_id,
3365 .size = sizeof(struct vxlan_net),
3366};
3367
3368static int __init vxlan_init_module(void)
3369{
3370 int rc;
3371
3372 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
3373
783c1463 3374 rc = register_pernet_subsys(&vxlan_net_ops);
d342894c 3375 if (rc)
3376 goto out1;
3377
acaf4e70 3378 rc = register_netdevice_notifier(&vxlan_notifier_block);
d342894c 3379 if (rc)
3380 goto out2;
3381
acaf4e70
DB		 3382 rc = rtnl_link_register(&vxlan_link_ops);
3383 if (rc)
3384 goto out3;
d342894c 3385
acaf4e70
DB		 3386 return 0;
3387out3:
3388 unregister_netdevice_notifier(&vxlan_notifier_block);
d342894c 3389out2:
783c1463 3390 unregister_pernet_subsys(&vxlan_net_ops);
d342894c 3391out1:
3392 return rc;
3393}
7332a13b 3394late_initcall(vxlan_init_module);
d342894c 3395
3396static void __exit vxlan_cleanup_module(void)
3397{
b7153984 3398 rtnl_link_unregister(&vxlan_link_ops);
acaf4e70 3399 unregister_netdevice_notifier(&vxlan_notifier_block);
783c1463
DB		 3400 unregister_pernet_subsys(&vxlan_net_ops);
3401 /* rcu_barrier() is called by netns */
d342894c 3402}
3403module_exit(vxlan_cleanup_module);
3404
3405MODULE_LICENSE("GPL");
3406MODULE_VERSION(VXLAN_VERSION);
3b8df3c6 3407MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
ead5139a 3408MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
d342894c 3409MODULE_ALIAS_RTNL_LINK("vxlan");
Linux 6.x block layer and io_uring tree(s)