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net: usbnet: update addr_assign_type if appropriate
[mirror_ubuntu-jammy-kernel.git] / drivers / net / vxlan.c
CommitLineData
d342894c 1/*
eb5ce439 2 * VXLAN: Virtual eXtensible Local Area Network
d342894c 3 *
3b8df3c6 4 * Copyright (c) 2012-2013 Vyatta Inc.
d342894c 5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
d342894c 9 */
10
11#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13#include <linux/kernel.h>
14#include <linux/types.h>
15#include <linux/module.h>
16#include <linux/errno.h>
17#include <linux/slab.h>
18#include <linux/skbuff.h>
19#include <linux/rculist.h>
20#include <linux/netdevice.h>
21#include <linux/in.h>
22#include <linux/ip.h>
23#include <linux/udp.h>
24#include <linux/igmp.h>
25#include <linux/etherdevice.h>
26#include <linux/if_ether.h>
1eaa8178 27#include <linux/if_vlan.h>
d342894c 28#include <linux/hash.h>
1b13c97f 29#include <linux/ethtool.h>
e4f67add
DS		 30#include <net/arp.h>
31#include <net/ndisc.h>
d342894c 32#include <net/ip.h>
c5441932 33#include <net/ip_tunnels.h>
d342894c 34#include <net/icmp.h>
35#include <net/udp.h>
36#include <net/rtnetlink.h>
37#include <net/route.h>
38#include <net/dsfield.h>
39#include <net/inet_ecn.h>
40#include <net/net_namespace.h>
41#include <net/netns/generic.h>
012a5729 42#include <net/vxlan.h>
e4c7ed41
CW		 43#if IS_ENABLED(CONFIG_IPV6)
44#include <net/ipv6.h>
45#include <net/addrconf.h>
46#include <net/ip6_tunnel.h>
660d98ca 47#include <net/ip6_checksum.h>
e4c7ed41 48#endif
d342894c 49
50#define VXLAN_VERSION "0.1"
51
553675fb 52#define PORT_HASH_BITS 8
53#define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
d342894c 54#define VNI_HASH_BITS 10
55#define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
56#define FDB_HASH_BITS 8
57#define FDB_HASH_SIZE (1<<FDB_HASH_BITS)
58#define FDB_AGE_DEFAULT 300 /* 5 min */
59#define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
60
61#define VXLAN_N_VID (1u << 24)
62#define VXLAN_VID_MASK (VXLAN_N_VID - 1)
52b702ff
AD		 63/* IP header + UDP + VXLAN + Ethernet header */
64#define VXLAN_HEADROOM (20 + 8 + 8 + 14)
e4c7ed41
CW		 65/* IPv6 header + UDP + VXLAN + Ethernet header */
66#define VXLAN6_HEADROOM (40 + 8 + 8 + 14)
7ce04758 67#define VXLAN_HLEN (sizeof(struct udphdr) + sizeof(struct vxlanhdr))
d342894c 68
69#define VXLAN_FLAGS 0x08000000 /* struct vxlanhdr.vx_flags required value. */
70
71/* VXLAN protocol header */
72struct vxlanhdr {
73 __be32 vx_flags;
74 __be32 vx_vni;
75};
76
23c578bf 77/* UDP port for VXLAN traffic.
78 * The IANA assigned port is 4789, but the Linux default is 8472
234f5b73 79 * for compatibility with early adopters.
23c578bf 80 */
9daaa397
SH		 81static unsigned short vxlan_port __read_mostly = 8472;
82module_param_named(udp_port, vxlan_port, ushort, 0444);
d342894c 83MODULE_PARM_DESC(udp_port, "Destination UDP port");
84
85static bool log_ecn_error = true;
86module_param(log_ecn_error, bool, 0644);
87MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
88
60d9d4c6 89static int vxlan_net_id;
553675fb 90
afbd8bae
MR		 91static const u8 all_zeros_mac[ETH_ALEN];
92
553675fb 93/* per-network namespace private data for this module */
94struct vxlan_net {
95 struct list_head vxlan_list;
96 struct hlist_head sock_list[PORT_HASH_SIZE];
1c51a915 97 spinlock_t sock_lock;
553675fb 98};
99
e4c7ed41
CW		 100union vxlan_addr {
101 struct sockaddr_in sin;
102 struct sockaddr_in6 sin6;
103 struct sockaddr sa;
104};
105
6681712d 106struct vxlan_rdst {
e4c7ed41 107 union vxlan_addr remote_ip;
6681712d
DS		 108 __be16 remote_port;
109 u32 remote_vni;
110 u32 remote_ifindex;
3e61aa8f 111 struct list_head list;
bc7892ba 112 struct rcu_head rcu;
6681712d
DS		 113};
114
d342894c 115/* Forwarding table entry */
116struct vxlan_fdb {
117 struct hlist_node hlist; /* linked list of entries */
118 struct rcu_head rcu;
119 unsigned long updated; /* jiffies */
120 unsigned long used;
3e61aa8f 121 struct list_head remotes;
d342894c 122 u16 state; /* see ndm_state */
ae884082 123 u8 flags; /* see ndm_flags */
d342894c 124 u8 eth_addr[ETH_ALEN];
125};
126
d342894c 127/* Pseudo network device */
128struct vxlan_dev {
553675fb 129 struct hlist_node hlist; /* vni hash table */
130 struct list_head next; /* vxlan's per namespace list */
131 struct vxlan_sock *vn_sock; /* listening socket */
d342894c 132 struct net_device *dev;
c7995c43 133 struct vxlan_rdst default_dst; /* default destination */
e4c7ed41 134 union vxlan_addr saddr; /* source address */
823aa873 135 __be16 dst_port;
05f47d69 136 __u16 port_min; /* source port range */
137 __u16 port_max;
d342894c 138 __u8 tos; /* TOS override */
139 __u8 ttl;
e4f67add 140 u32 flags; /* VXLAN_F_* below */
d342894c 141
1c51a915 142 struct work_struct sock_work;
3fc2de2f 143 struct work_struct igmp_join;
144 struct work_struct igmp_leave;
1c51a915 145
d342894c 146 unsigned long age_interval;
147 struct timer_list age_timer;
148 spinlock_t hash_lock;
149 unsigned int addrcnt;
150 unsigned int addrmax;
d342894c 151
152 struct hlist_head fdb_head[FDB_HASH_SIZE];
153};
154
e4f67add
DS		 155#define VXLAN_F_LEARN 0x01
156#define VXLAN_F_PROXY 0x02
157#define VXLAN_F_RSC 0x04
158#define VXLAN_F_L2MISS 0x08
159#define VXLAN_F_L3MISS 0x10
e4c7ed41 160#define VXLAN_F_IPV6 0x20 /* internal flag */
e4f67add 161
d342894c 162/* salt for hash table */
163static u32 vxlan_salt __read_mostly;
758c57d1 164static struct workqueue_struct *vxlan_wq;
d342894c 165
1c51a915
SH		 166static void vxlan_sock_work(struct work_struct *work);
167
e4c7ed41
CW		 168#if IS_ENABLED(CONFIG_IPV6)
169static inline
170bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
171{
172 if (a->sa.sa_family != b->sa.sa_family)
173 return false;
174 if (a->sa.sa_family == AF_INET6)
175 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
176 else
177 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
178}
179
180static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
181{
182 if (ipa->sa.sa_family == AF_INET6)
183 return ipv6_addr_any(&ipa->sin6.sin6_addr);
184 else
185 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
186}
187
188static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
189{
190 if (ipa->sa.sa_family == AF_INET6)
191 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
192 else
193 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
194}
195
196static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
197{
198 if (nla_len(nla) >= sizeof(struct in6_addr)) {
199 nla_memcpy(&ip->sin6.sin6_addr, nla, sizeof(struct in6_addr));
200 ip->sa.sa_family = AF_INET6;
201 return 0;
202 } else if (nla_len(nla) >= sizeof(__be32)) {
203 ip->sin.sin_addr.s_addr = nla_get_be32(nla);
204 ip->sa.sa_family = AF_INET;
205 return 0;
206 } else {
207 return -EAFNOSUPPORT;
208 }
209}
210
211static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
212 const union vxlan_addr *ip)
213{
214 if (ip->sa.sa_family == AF_INET6)
215 return nla_put(skb, attr, sizeof(struct in6_addr), &ip->sin6.sin6_addr);
216 else
217 return nla_put_be32(skb, attr, ip->sin.sin_addr.s_addr);
218}
219
220#else /* !CONFIG_IPV6 */
221
222static inline
223bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
224{
225 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
226}
227
228static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
229{
230 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
231}
232
233static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
234{
235 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
236}
237
238static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
239{
240 if (nla_len(nla) >= sizeof(struct in6_addr)) {
241 return -EAFNOSUPPORT;
242 } else if (nla_len(nla) >= sizeof(__be32)) {
243 ip->sin.sin_addr.s_addr = nla_get_be32(nla);
244 ip->sa.sa_family = AF_INET;
245 return 0;
246 } else {
247 return -EAFNOSUPPORT;
248 }
249}
250
251static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
252 const union vxlan_addr *ip)
253{
254 return nla_put_be32(skb, attr, ip->sin.sin_addr.s_addr);
255}
256#endif
257
553675fb 258/* Virtual Network hash table head */
259static inline struct hlist_head *vni_head(struct vxlan_sock *vs, u32 id)
260{
261 return &vs->vni_list[hash_32(id, VNI_HASH_BITS)];
262}
263
264/* Socket hash table head */
265static inline struct hlist_head *vs_head(struct net *net, __be16 port)
d342894c 266{
267 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
268
553675fb 269 return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
270}
271
3e61aa8f
SH		 272/* First remote destination for a forwarding entry.
273 * Guaranteed to be non-NULL because remotes are never deleted.
274 */
5ca5461c 275static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
3e61aa8f 276{
5ca5461c 277 return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
278}
279
280static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
281{
282 return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
3e61aa8f
SH		 283}
284
553675fb 285/* Find VXLAN socket based on network namespace and UDP port */
9c2e24e1 286static struct vxlan_sock *vxlan_find_sock(struct net *net, __be16 port)
553675fb 287{
288 struct vxlan_sock *vs;
289
290 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
291 if (inet_sk(vs->sock->sk)->inet_sport == port)
292 return vs;
293 }
294 return NULL;
d342894c 295}
296
5cfccc5a 297static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, u32 id)
d342894c 298{
299 struct vxlan_dev *vxlan;
d342894c 300
553675fb 301 hlist_for_each_entry_rcu(vxlan, vni_head(vs, id), hlist) {
c7995c43 302 if (vxlan->default_dst.remote_vni == id)
d342894c 303 return vxlan;
304 }
305
306 return NULL;
307}
308
5cfccc5a
PS		 309/* Look up VNI in a per net namespace table */
310static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id, __be16 port)
311{
312 struct vxlan_sock *vs;
313
314 vs = vxlan_find_sock(net, port);
315 if (!vs)
316 return NULL;
317
318 return vxlan_vs_find_vni(vs, id);
319}
320
d342894c 321/* Fill in neighbour message in skbuff. */
322static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
234f5b73
SH		 323 const struct vxlan_fdb *fdb,
324 u32 portid, u32 seq, int type, unsigned int flags,
325 const struct vxlan_rdst *rdst)
d342894c 326{
327 unsigned long now = jiffies;
328 struct nda_cacheinfo ci;
329 struct nlmsghdr *nlh;
330 struct ndmsg *ndm;
e4f67add 331 bool send_ip, send_eth;
d342894c 332
333 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
334 if (nlh == NULL)
335 return -EMSGSIZE;
336
337 ndm = nlmsg_data(nlh);
338 memset(ndm, 0, sizeof(*ndm));
e4f67add
DS		 339
340 send_eth = send_ip = true;
341
342 if (type == RTM_GETNEIGH) {
343 ndm->ndm_family = AF_INET;
e4c7ed41 344 send_ip = !vxlan_addr_any(&rdst->remote_ip);
e4f67add
DS		 345 send_eth = !is_zero_ether_addr(fdb->eth_addr);
346 } else
347 ndm->ndm_family = AF_BRIDGE;
d342894c 348 ndm->ndm_state = fdb->state;
349 ndm->ndm_ifindex = vxlan->dev->ifindex;
ae884082 350 ndm->ndm_flags = fdb->flags;
d342894c 351 ndm->ndm_type = NDA_DST;
352
e4f67add 353 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
d342894c 354 goto nla_put_failure;
355
e4c7ed41 356 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
6681712d
DS		 357 goto nla_put_failure;
358
823aa873 359 if (rdst->remote_port && rdst->remote_port != vxlan->dst_port &&
6681712d
DS		 360 nla_put_be16(skb, NDA_PORT, rdst->remote_port))
361 goto nla_put_failure;
c7995c43 362 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
60d9d4c6 363 nla_put_u32(skb, NDA_VNI, rdst->remote_vni))
6681712d
DS		 364 goto nla_put_failure;
365 if (rdst->remote_ifindex &&
366 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
d342894c 367 goto nla_put_failure;
368
369 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
370 ci.ndm_confirmed = 0;
371 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
372 ci.ndm_refcnt = 0;
373
374 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
375 goto nla_put_failure;
376
377 return nlmsg_end(skb, nlh);
378
379nla_put_failure:
380 nlmsg_cancel(skb, nlh);
381 return -EMSGSIZE;
382}
383
384static inline size_t vxlan_nlmsg_size(void)
385{
386 return NLMSG_ALIGN(sizeof(struct ndmsg))
387 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
e4c7ed41 388 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
73cf3317 389 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
6681712d
DS		 390 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
391 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
d342894c 392 + nla_total_size(sizeof(struct nda_cacheinfo));
393}
394
395static void vxlan_fdb_notify(struct vxlan_dev *vxlan,
3e61aa8f 396 struct vxlan_fdb *fdb, int type)
d342894c 397{
398 struct net *net = dev_net(vxlan->dev);
399 struct sk_buff *skb;
400 int err = -ENOBUFS;
401
402 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
403 if (skb == NULL)
404 goto errout;
405
5ca5461c 406 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0,
407 first_remote_rtnl(fdb));
d342894c 408 if (err < 0) {
409 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
410 WARN_ON(err == -EMSGSIZE);
411 kfree_skb(skb);
412 goto errout;
413 }
414
415 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
416 return;
417errout:
418 if (err < 0)
419 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
420}
421
e4c7ed41 422static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
e4f67add
DS		 423{
424 struct vxlan_dev *vxlan = netdev_priv(dev);
bb3fd687
SH		 425 struct vxlan_fdb f = {
426 .state = NUD_STALE,
427 };
428 struct vxlan_rdst remote = {
e4c7ed41 429 .remote_ip = *ipa, /* goes to NDA_DST */
bb3fd687
SH		 430 .remote_vni = VXLAN_N_VID,
431 };
3e61aa8f
SH		 432
433 INIT_LIST_HEAD(&f.remotes);
434 list_add_rcu(&remote.list, &f.remotes);
e4f67add
DS		 435
436 vxlan_fdb_notify(vxlan, &f, RTM_GETNEIGH);
437}
438
439static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
440{
bb3fd687
SH		 441 struct vxlan_fdb f = {
442 .state = NUD_STALE,
443 };
e4f67add 444
3e61aa8f 445 INIT_LIST_HEAD(&f.remotes);
e4f67add
DS		 446 memcpy(f.eth_addr, eth_addr, ETH_ALEN);
447
448 vxlan_fdb_notify(vxlan, &f, RTM_GETNEIGH);
449}
450
d342894c 451/* Hash Ethernet address */
452static u32 eth_hash(const unsigned char *addr)
453{
454 u64 value = get_unaligned((u64 *)addr);
455
456 /* only want 6 bytes */
457#ifdef __BIG_ENDIAN
d342894c 458 value >>= 16;
321fb991 459#else
460 value <<= 16;
d342894c 461#endif
462 return hash_64(value, FDB_HASH_BITS);
463}
464
465/* Hash chain to use given mac address */
466static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
467 const u8 *mac)
468{
469 return &vxlan->fdb_head[eth_hash(mac)];
470}
471
472/* Look up Ethernet address in forwarding table */
014be2c8 473static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
d342894c 474 const u8 *mac)
475
476{
477 struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
478 struct vxlan_fdb *f;
d342894c 479
b67bfe0d 480 hlist_for_each_entry_rcu(f, head, hlist) {
7367d0b5 481 if (ether_addr_equal(mac, f->eth_addr))
d342894c 482 return f;
483 }
484
485 return NULL;
486}
487
014be2c8
SS		 488static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
489 const u8 *mac)
490{
491 struct vxlan_fdb *f;
492
493 f = __vxlan_find_mac(vxlan, mac);
494 if (f)
495 f->used = jiffies;
496
497 return f;
498}
499
a5e7c10a
MR		 500/* caller should hold vxlan->hash_lock */
501static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
e4c7ed41 502 union vxlan_addr *ip, __be16 port,
a5e7c10a 503 __u32 vni, __u32 ifindex)
6681712d 504{
3e61aa8f 505 struct vxlan_rdst *rd;
6681712d 506
3e61aa8f 507 list_for_each_entry(rd, &f->remotes, list) {
e4c7ed41 508 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
6681712d
DS		 509 rd->remote_port == port &&
510 rd->remote_vni == vni &&
511 rd->remote_ifindex == ifindex)
a5e7c10a 512 return rd;
6681712d 513 }
3e61aa8f 514
a5e7c10a
MR		 515 return NULL;
516}
517
906dc186
TR		 518/* Replace destination of unicast mac */
519static int vxlan_fdb_replace(struct vxlan_fdb *f,
e4c7ed41 520 union vxlan_addr *ip, __be16 port, __u32 vni, __u32 ifindex)
906dc186
TR		 521{
522 struct vxlan_rdst *rd;
523
524 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
525 if (rd)
526 return 0;
527
528 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
529 if (!rd)
530 return 0;
e4c7ed41 531 rd->remote_ip = *ip;
906dc186
TR		 532 rd->remote_port = port;
533 rd->remote_vni = vni;
534 rd->remote_ifindex = ifindex;
535 return 1;
536}
537
a5e7c10a
MR		 538/* Add/update destinations for multicast */
539static int vxlan_fdb_append(struct vxlan_fdb *f,
e4c7ed41 540 union vxlan_addr *ip, __be16 port, __u32 vni, __u32 ifindex)
a5e7c10a
MR		 541{
542 struct vxlan_rdst *rd;
543
544 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
545 if (rd)
546 return 0;
547
6681712d
DS		 548 rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
549 if (rd == NULL)
550 return -ENOBUFS;
e4c7ed41 551 rd->remote_ip = *ip;
6681712d
DS		 552 rd->remote_port = port;
553 rd->remote_vni = vni;
554 rd->remote_ifindex = ifindex;
3e61aa8f
SH		 555
556 list_add_tail_rcu(&rd->list, &f->remotes);
557
6681712d
DS		 558 return 1;
559}
560
d342894c 561/* Add new entry to forwarding table -- assumes lock held */
562static int vxlan_fdb_create(struct vxlan_dev *vxlan,
e4c7ed41 563 const u8 *mac, union vxlan_addr *ip,
6681712d 564 __u16 state, __u16 flags,
73cf3317 565 __be16 port, __u32 vni, __u32 ifindex,
ae884082 566 __u8 ndm_flags)
d342894c 567{
568 struct vxlan_fdb *f;
569 int notify = 0;
570
014be2c8 571 f = __vxlan_find_mac(vxlan, mac);
d342894c 572 if (f) {
573 if (flags & NLM_F_EXCL) {
574 netdev_dbg(vxlan->dev,
575 "lost race to create %pM\n", mac);
576 return -EEXIST;
577 }
578 if (f->state != state) {
579 f->state = state;
580 f->updated = jiffies;
581 notify = 1;
582 }
ae884082
DS		 583 if (f->flags != ndm_flags) {
584 f->flags = ndm_flags;
585 f->updated = jiffies;
586 notify = 1;
587 }
906dc186
TR		 588 if ((flags & NLM_F_REPLACE)) {
589 /* Only change unicasts */
590 if (!(is_multicast_ether_addr(f->eth_addr) ||
591 is_zero_ether_addr(f->eth_addr))) {
592 int rc = vxlan_fdb_replace(f, ip, port, vni,
593 ifindex);
594
595 if (rc < 0)
596 return rc;
597 notify |= rc;
598 } else
599 return -EOPNOTSUPP;
600 }
6681712d 601 if ((flags & NLM_F_APPEND) &&
58e4c767
MR		 602 (is_multicast_ether_addr(f->eth_addr) ||
603 is_zero_ether_addr(f->eth_addr))) {
6681712d
DS		 604 int rc = vxlan_fdb_append(f, ip, port, vni, ifindex);
605
606 if (rc < 0)
607 return rc;
608 notify |= rc;
609 }
d342894c 610 } else {
611 if (!(flags & NLM_F_CREATE))
612 return -ENOENT;
613
614 if (vxlan->addrmax && vxlan->addrcnt >= vxlan->addrmax)
615 return -ENOSPC;
616
906dc186
TR		 617 /* Disallow replace to add a multicast entry */
618 if ((flags & NLM_F_REPLACE) &&
619 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
620 return -EOPNOTSUPP;
621
e4c7ed41 622 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
d342894c 623 f = kmalloc(sizeof(*f), GFP_ATOMIC);
624 if (!f)
625 return -ENOMEM;
626
627 notify = 1;
d342894c 628 f->state = state;
ae884082 629 f->flags = ndm_flags;
d342894c 630 f->updated = f->used = jiffies;
3e61aa8f 631 INIT_LIST_HEAD(&f->remotes);
d342894c 632 memcpy(f->eth_addr, mac, ETH_ALEN);
633
3e61aa8f
SH		 634 vxlan_fdb_append(f, ip, port, vni, ifindex);
635
d342894c 636 ++vxlan->addrcnt;
637 hlist_add_head_rcu(&f->hlist,
638 vxlan_fdb_head(vxlan, mac));
639 }
640
641 if (notify)
642 vxlan_fdb_notify(vxlan, f, RTM_NEWNEIGH);
643
644 return 0;
645}
646
6706c82e 647static void vxlan_fdb_free(struct rcu_head *head)
6681712d
DS		 648{
649 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
3e61aa8f 650 struct vxlan_rdst *rd, *nd;
6681712d 651
3e61aa8f 652 list_for_each_entry_safe(rd, nd, &f->remotes, list)
6681712d 653 kfree(rd);
6681712d
DS		 654 kfree(f);
655}
656
d342894c 657static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
658{
659 netdev_dbg(vxlan->dev,
660 "delete %pM\n", f->eth_addr);
661
662 --vxlan->addrcnt;
663 vxlan_fdb_notify(vxlan, f, RTM_DELNEIGH);
664
665 hlist_del_rcu(&f->hlist);
6681712d 666 call_rcu(&f->rcu, vxlan_fdb_free);
d342894c 667}
668
f0b074be 669static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
e4c7ed41 670 union vxlan_addr *ip, __be16 *port, u32 *vni, u32 *ifindex)
d342894c 671{
6681712d 672 struct net *net = dev_net(vxlan->dev);
e4c7ed41 673 int err;
d342894c 674
f0b074be 675 if (tb[NDA_DST]) {
e4c7ed41
CW		 676 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
677 if (err)
678 return err;
f0b074be 679 } else {
e4c7ed41
CW		 680 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
681 if (remote->sa.sa_family == AF_INET) {
682 ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
683 ip->sa.sa_family = AF_INET;
684#if IS_ENABLED(CONFIG_IPV6)
685 } else {
686 ip->sin6.sin6_addr = in6addr_any;
687 ip->sa.sa_family = AF_INET6;
688#endif
689 }
f0b074be 690 }
d342894c 691
6681712d 692 if (tb[NDA_PORT]) {
73cf3317 693 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
6681712d 694 return -EINVAL;
f0b074be
MR		 695 *port = nla_get_be16(tb[NDA_PORT]);
696 } else {
697 *port = vxlan->dst_port;
698 }
6681712d
DS		 699
700 if (tb[NDA_VNI]) {
701 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
702 return -EINVAL;
f0b074be
MR		 703 *vni = nla_get_u32(tb[NDA_VNI]);
704 } else {
705 *vni = vxlan->default_dst.remote_vni;
706 }
6681712d
DS		 707
708 if (tb[NDA_IFINDEX]) {
5abb0029 709 struct net_device *tdev;
6681712d
DS		 710
711 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
712 return -EINVAL;
f0b074be
MR		 713 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
714 tdev = dev_get_by_index(net, *ifindex);
5abb0029 715 if (!tdev)
6681712d 716 return -EADDRNOTAVAIL;
5abb0029 717 dev_put(tdev);
f0b074be
MR		 718 } else {
719 *ifindex = 0;
720 }
721
722 return 0;
723}
724
725/* Add static entry (via netlink) */
726static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
727 struct net_device *dev,
728 const unsigned char *addr, u16 flags)
729{
730 struct vxlan_dev *vxlan = netdev_priv(dev);
731 /* struct net *net = dev_net(vxlan->dev); */
e4c7ed41 732 union vxlan_addr ip;
f0b074be
MR		 733 __be16 port;
734 u32 vni, ifindex;
735 int err;
736
737 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
738 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
739 ndm->ndm_state);
740 return -EINVAL;
741 }
742
743 if (tb[NDA_DST] == NULL)
744 return -EINVAL;
745
746 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
747 if (err)
748 return err;
6681712d 749
d342894c 750 spin_lock_bh(&vxlan->hash_lock);
e4c7ed41 751 err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
73cf3317 752 port, vni, ifindex, ndm->ndm_flags);
d342894c 753 spin_unlock_bh(&vxlan->hash_lock);
754
755 return err;
756}
757
758/* Delete entry (via netlink) */
1690be63
VY		 759static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
760 struct net_device *dev,
d342894c 761 const unsigned char *addr)
762{
763 struct vxlan_dev *vxlan = netdev_priv(dev);
764 struct vxlan_fdb *f;
bc7892ba 765 struct vxlan_rdst *rd = NULL;
e4c7ed41 766 union vxlan_addr ip;
bc7892ba
MR		 767 __be16 port;
768 u32 vni, ifindex;
769 int err;
770
771 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
772 if (err)
773 return err;
774
775 err = -ENOENT;
d342894c 776
777 spin_lock_bh(&vxlan->hash_lock);
778 f = vxlan_find_mac(vxlan, addr);
bc7892ba
MR		 779 if (!f)
780 goto out;
781
e4c7ed41
CW		 782 if (!vxlan_addr_any(&ip)) {
783 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
bc7892ba
MR		 784 if (!rd)
785 goto out;
786 }
787
788 err = 0;
789
790 /* remove a destination if it's not the only one on the list,
791 * otherwise destroy the fdb entry
792 */
793 if (rd && !list_is_singular(&f->remotes)) {
794 list_del_rcu(&rd->list);
dcdc7a59 795 kfree_rcu(rd, rcu);
bc7892ba 796 goto out;
d342894c 797 }
bc7892ba
MR		 798
799 vxlan_fdb_destroy(vxlan, f);
800
801out:
d342894c 802 spin_unlock_bh(&vxlan->hash_lock);
803
804 return err;
805}
806
807/* Dump forwarding table */
808static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
809 struct net_device *dev, int idx)
810{
811 struct vxlan_dev *vxlan = netdev_priv(dev);
812 unsigned int h;
813
814 for (h = 0; h < FDB_HASH_SIZE; ++h) {
815 struct vxlan_fdb *f;
d342894c 816 int err;
817
b67bfe0d 818 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
6681712d 819 struct vxlan_rdst *rd;
6681712d 820
3e61aa8f
SH		 821 if (idx < cb->args[0])
822 goto skip;
823
824 list_for_each_entry_rcu(rd, &f->remotes, list) {
6681712d
DS		 825 err = vxlan_fdb_info(skb, vxlan, f,
826 NETLINK_CB(cb->skb).portid,
827 cb->nlh->nlmsg_seq,
828 RTM_NEWNEIGH,
829 NLM_F_MULTI, rd);
830 if (err < 0)
3e61aa8f 831 goto out;
6681712d 832 }
3e61aa8f
SH		 833skip:
834 ++idx;
d342894c 835 }
836 }
3e61aa8f 837out:
d342894c 838 return idx;
839}
840
841/* Watch incoming packets to learn mapping between Ethernet address
842 * and Tunnel endpoint.
26a41ae6 843 * Return true if packet is bogus and should be droppped.
d342894c 844 */
26a41ae6 845static bool vxlan_snoop(struct net_device *dev,
e4c7ed41 846 union vxlan_addr *src_ip, const u8 *src_mac)
d342894c 847{
848 struct vxlan_dev *vxlan = netdev_priv(dev);
849 struct vxlan_fdb *f;
d342894c 850
851 f = vxlan_find_mac(vxlan, src_mac);
852 if (likely(f)) {
5ca5461c 853 struct vxlan_rdst *rdst = first_remote_rcu(f);
3e61aa8f 854
e4c7ed41 855 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
26a41ae6 856 return false;
857
858 /* Don't migrate static entries, drop packets */
eb064c3b 859 if (f->state & NUD_NOARP)
26a41ae6 860 return true;
d342894c 861
862 if (net_ratelimit())
863 netdev_info(dev,
e4c7ed41 864 "%pM migrated from %pIS to %pIS\n",
3e61aa8f 865 src_mac, &rdst->remote_ip, &src_ip);
d342894c 866
e4c7ed41 867 rdst->remote_ip = *src_ip;
d342894c 868 f->updated = jiffies;
8385f50a 869 vxlan_fdb_notify(vxlan, f, RTM_NEWNEIGH);
d342894c 870 } else {
871 /* learned new entry */
872 spin_lock(&vxlan->hash_lock);
3bf74b1a 873
874 /* close off race between vxlan_flush and incoming packets */
875 if (netif_running(dev))
876 vxlan_fdb_create(vxlan, src_mac, src_ip,
877 NUD_REACHABLE,
878 NLM_F_EXCL|NLM_F_CREATE,
879 vxlan->dst_port,
880 vxlan->default_dst.remote_vni,
881 0, NTF_SELF);
d342894c 882 spin_unlock(&vxlan->hash_lock);
883 }
26a41ae6 884
885 return false;
d342894c 886}
887
d342894c 888/* See if multicast group is already in use by other ID */
e4c7ed41 889static bool vxlan_group_used(struct vxlan_net *vn, union vxlan_addr *remote_ip)
d342894c 890{
553675fb 891 struct vxlan_dev *vxlan;
d342894c 892
553675fb 893 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
553675fb 894 if (!netif_running(vxlan->dev))
895 continue;
d342894c 896
e4c7ed41
CW		 897 if (vxlan_addr_equal(&vxlan->default_dst.remote_ip,
898 remote_ip))
553675fb 899 return true;
900 }
d342894c 901
902 return false;
903}
904
7c47cedf 905static void vxlan_sock_hold(struct vxlan_sock *vs)
d342894c 906{
7c47cedf
SH		 907 atomic_inc(&vs->refcnt);
908}
d342894c 909
012a5729 910void vxlan_sock_release(struct vxlan_sock *vs)
7c47cedf 911{
012a5729
PS		 912 struct vxlan_net *vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
913
7c47cedf
SH		 914 if (!atomic_dec_and_test(&vs->refcnt))
915 return;
d342894c 916
1c51a915 917 spin_lock(&vn->sock_lock);
7c47cedf 918 hlist_del_rcu(&vs->hlist);
430eda6d
PS		 919 smp_wmb();
920 vs->sock->sk->sk_user_data = NULL;
1c51a915
SH		 921 spin_unlock(&vn->sock_lock);
922
7c47cedf 923 queue_work(vxlan_wq, &vs->del_work);
d342894c 924}
012a5729 925EXPORT_SYMBOL_GPL(vxlan_sock_release);
d342894c 926
3fc2de2f 927/* Callback to update multicast group membership when first VNI on
928 * multicast asddress is brought up
929 * Done as workqueue because ip_mc_join_group acquires RTNL.
7c47cedf 930 */
3fc2de2f 931static void vxlan_igmp_join(struct work_struct *work)
d342894c 932{
3fc2de2f 933 struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_join);
7c47cedf
SH		 934 struct vxlan_sock *vs = vxlan->vn_sock;
935 struct sock *sk = vs->sock->sk;
e4c7ed41
CW		 936 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
937 int ifindex = vxlan->default_dst.remote_ifindex;
d342894c 938
d342894c 939 lock_sock(sk);
e4c7ed41
CW		 940 if (ip->sa.sa_family == AF_INET) {
941 struct ip_mreqn mreq = {
942 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
943 .imr_ifindex = ifindex,
944 };
945
946 ip_mc_join_group(sk, &mreq);
947#if IS_ENABLED(CONFIG_IPV6)
948 } else {
949 ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
950 &ip->sin6.sin6_addr);
951#endif
952 }
3fc2de2f 953 release_sock(sk);
954
012a5729 955 vxlan_sock_release(vs);
3fc2de2f 956 dev_put(vxlan->dev);
957}
958
959/* Inverse of vxlan_igmp_join when last VNI is brought down */
960static void vxlan_igmp_leave(struct work_struct *work)
961{
962 struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_leave);
3fc2de2f 963 struct vxlan_sock *vs = vxlan->vn_sock;
964 struct sock *sk = vs->sock->sk;
e4c7ed41
CW		 965 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
966 int ifindex = vxlan->default_dst.remote_ifindex;
3fc2de2f 967
968 lock_sock(sk);
e4c7ed41
CW		 969 if (ip->sa.sa_family == AF_INET) {
970 struct ip_mreqn mreq = {
971 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
972 .imr_ifindex = ifindex,
973 };
974
975 ip_mc_leave_group(sk, &mreq);
976#if IS_ENABLED(CONFIG_IPV6)
977 } else {
978 ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
979 &ip->sin6.sin6_addr);
980#endif
981 }
982
d342894c 983 release_sock(sk);
d342894c 984
012a5729 985 vxlan_sock_release(vs);
7c47cedf 986 dev_put(vxlan->dev);
d342894c 987}
988
989/* Callback from net/ipv4/udp.c to receive packets */
990static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
991{
5cfccc5a 992 struct vxlan_sock *vs;
d342894c 993 struct vxlanhdr *vxh;
553675fb 994 __be16 port;
d342894c 995
d342894c 996 /* Need Vxlan and inner Ethernet header to be present */
7ce04758 997 if (!pskb_may_pull(skb, VXLAN_HLEN))
d342894c 998 goto error;
999
7ce04758
PS		 1000 /* Return packets with reserved bits set */
1001 vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
d342894c 1002 if (vxh->vx_flags != htonl(VXLAN_FLAGS) ||
1003 (vxh->vx_vni & htonl(0xff))) {
1004 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1005 ntohl(vxh->vx_flags), ntohl(vxh->vx_vni));
1006 goto error;
1007 }
1008
5cfccc5a
PS		 1009 if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB)))
1010 goto drop;
1011
553675fb 1012 port = inet_sk(sk)->inet_sport;
5cfccc5a 1013
430eda6d
PS		 1014 smp_read_barrier_depends();
1015 vs = (struct vxlan_sock *)sk->sk_user_data;
5cfccc5a 1016 if (!vs)
d342894c 1017 goto drop;
d342894c 1018
5cfccc5a
PS		 1019 vs->rcv(vs, skb, vxh->vx_vni);
1020 return 0;
1021
1022drop:
1023 /* Consume bad packet */
1024 kfree_skb(skb);
1025 return 0;
1026
1027error:
1028 /* Return non vxlan pkt */
1029 return 1;
1030}
1031
1032static void vxlan_rcv(struct vxlan_sock *vs,
1033 struct sk_buff *skb, __be32 vx_vni)
1034{
e4c7ed41
CW		 1035 struct iphdr *oip = NULL;
1036 struct ipv6hdr *oip6 = NULL;
5cfccc5a
PS		 1037 struct vxlan_dev *vxlan;
1038 struct pcpu_tstats *stats;
e4c7ed41 1039 union vxlan_addr saddr;
5cfccc5a 1040 __u32 vni;
e4c7ed41
CW		 1041 int err = 0;
1042 union vxlan_addr *remote_ip;
5cfccc5a
PS		 1043
1044 vni = ntohl(vx_vni) >> 8;
1045 /* Is this VNI defined? */
1046 vxlan = vxlan_vs_find_vni(vs, vni);
1047 if (!vxlan)
d342894c 1048 goto drop;
d342894c 1049
e4c7ed41 1050 remote_ip = &vxlan->default_dst.remote_ip;
e4f67add 1051 skb_reset_mac_header(skb);
d342894c 1052 skb->protocol = eth_type_trans(skb, vxlan->dev);
d342894c 1053
1054 /* Ignore packet loops (and multicast echo) */
7367d0b5 1055 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
d342894c 1056 goto drop;
1057
7ce04758 1058 /* Re-examine inner Ethernet packet */
e4c7ed41
CW		 1059 if (remote_ip->sa.sa_family == AF_INET) {
1060 oip = ip_hdr(skb);
1061 saddr.sin.sin_addr.s_addr = oip->saddr;
1062 saddr.sa.sa_family = AF_INET;
1063#if IS_ENABLED(CONFIG_IPV6)
1064 } else {
1065 oip6 = ipv6_hdr(skb);
1066 saddr.sin6.sin6_addr = oip6->saddr;
1067 saddr.sa.sa_family = AF_INET6;
1068#endif
1069 }
1070
26a41ae6 1071 if ((vxlan->flags & VXLAN_F_LEARN) &&
e4c7ed41 1072 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
26a41ae6 1073 goto drop;
d342894c 1074
d342894c 1075 skb_reset_network_header(skb);
0afb1666
JG		 1076
1077 /* If the NIC driver gave us an encapsulated packet with
1078 * CHECKSUM_UNNECESSARY and Rx checksum feature is enabled,
1079 * leave the CHECKSUM_UNNECESSARY, the device checksummed it
1080 * for us. Otherwise force the upper layers to verify it.
1081 */
1082 if (skb->ip_summed != CHECKSUM_UNNECESSARY || !skb->encapsulation ||
1083 !(vxlan->dev->features & NETIF_F_RXCSUM))
1084 skb->ip_summed = CHECKSUM_NONE;
1085
1086 skb->encapsulation = 0;
d342894c 1087
e4c7ed41
CW		 1088 if (oip6)
1089 err = IP6_ECN_decapsulate(oip6, skb);
1090 if (oip)
1091 err = IP_ECN_decapsulate(oip, skb);
1092
d342894c 1093 if (unlikely(err)) {
e4c7ed41
CW		 1094 if (log_ecn_error) {
1095 if (oip6)
1096 net_info_ratelimited("non-ECT from %pI6\n",
1097 &oip6->saddr);
1098 if (oip)
1099 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1100 &oip->saddr, oip->tos);
1101 }
d342894c 1102 if (err > 1) {
1103 ++vxlan->dev->stats.rx_frame_errors;
1104 ++vxlan->dev->stats.rx_errors;
1105 goto drop;
1106 }
1107 }
1108
e8171045 1109 stats = this_cpu_ptr(vxlan->dev->tstats);
d342894c 1110 u64_stats_update_begin(&stats->syncp);
1111 stats->rx_packets++;
1112 stats->rx_bytes += skb->len;
1113 u64_stats_update_end(&stats->syncp);
1114
1115 netif_rx(skb);
1116
5cfccc5a 1117 return;
d342894c 1118drop:
1119 /* Consume bad packet */
1120 kfree_skb(skb);
d342894c 1121}
1122
e4f67add
DS		 1123static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1124{
1125 struct vxlan_dev *vxlan = netdev_priv(dev);
1126 struct arphdr *parp;
1127 u8 *arpptr, *sha;
1128 __be32 sip, tip;
1129 struct neighbour *n;
1130
1131 if (dev->flags & IFF_NOARP)
1132 goto out;
1133
1134 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1135 dev->stats.tx_dropped++;
1136 goto out;
1137 }
1138 parp = arp_hdr(skb);
1139
1140 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1141 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1142 parp->ar_pro != htons(ETH_P_IP) ||
1143 parp->ar_op != htons(ARPOP_REQUEST) ||
1144 parp->ar_hln != dev->addr_len ||
1145 parp->ar_pln != 4)
1146 goto out;
1147 arpptr = (u8 *)parp + sizeof(struct arphdr);
1148 sha = arpptr;
1149 arpptr += dev->addr_len; /* sha */
1150 memcpy(&sip, arpptr, sizeof(sip));
1151 arpptr += sizeof(sip);
1152 arpptr += dev->addr_len; /* tha */
1153 memcpy(&tip, arpptr, sizeof(tip));
1154
1155 if (ipv4_is_loopback(tip) ||
1156 ipv4_is_multicast(tip))
1157 goto out;
1158
1159 n = neigh_lookup(&arp_tbl, &tip, dev);
1160
1161 if (n) {
e4f67add
DS		 1162 struct vxlan_fdb *f;
1163 struct sk_buff *reply;
1164
1165 if (!(n->nud_state & NUD_CONNECTED)) {
1166 neigh_release(n);
1167 goto out;
1168 }
1169
1170 f = vxlan_find_mac(vxlan, n->ha);
e4c7ed41 1171 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
e4f67add
DS		 1172 /* bridge-local neighbor */
1173 neigh_release(n);
1174 goto out;
1175 }
1176
1177 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1178 n->ha, sha);
1179
1180 neigh_release(n);
1181
1182 skb_reset_mac_header(reply);
1183 __skb_pull(reply, skb_network_offset(reply));
1184 reply->ip_summed = CHECKSUM_UNNECESSARY;
1185 reply->pkt_type = PACKET_HOST;
1186
1187 if (netif_rx_ni(reply) == NET_RX_DROP)
1188 dev->stats.rx_dropped++;
e4c7ed41
CW		 1189 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1190 union vxlan_addr ipa = {
1191 .sin.sin_addr.s_addr = tip,
1192 .sa.sa_family = AF_INET,
1193 };
1194
1195 vxlan_ip_miss(dev, &ipa);
1196 }
e4f67add
DS		 1197out:
1198 consume_skb(skb);
1199 return NETDEV_TX_OK;
1200}
1201
f564f45c
CW		 1202#if IS_ENABLED(CONFIG_IPV6)
1203static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1204{
1205 struct vxlan_dev *vxlan = netdev_priv(dev);
1206 struct neighbour *n;
1207 union vxlan_addr ipa;
1208 const struct ipv6hdr *iphdr;
1209 const struct in6_addr *saddr, *daddr;
1210 struct nd_msg *msg;
1211 struct inet6_dev *in6_dev = NULL;
1212
1213 in6_dev = __in6_dev_get(dev);
1214 if (!in6_dev)
1215 goto out;
1216
1217 if (!pskb_may_pull(skb, skb->len))
1218 goto out;
1219
1220 iphdr = ipv6_hdr(skb);
1221 saddr = &iphdr->saddr;
1222 daddr = &iphdr->daddr;
1223
1224 if (ipv6_addr_loopback(daddr) ||
1225 ipv6_addr_is_multicast(daddr))
1226 goto out;
1227
1228 msg = (struct nd_msg *)skb_transport_header(skb);
1229 if (msg->icmph.icmp6_code != 0 ||
1230 msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1231 goto out;
1232
1233 n = neigh_lookup(ipv6_stub->nd_tbl, daddr, dev);
1234
1235 if (n) {
1236 struct vxlan_fdb *f;
1237
1238 if (!(n->nud_state & NUD_CONNECTED)) {
1239 neigh_release(n);
1240 goto out;
1241 }
1242
1243 f = vxlan_find_mac(vxlan, n->ha);
1244 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1245 /* bridge-local neighbor */
1246 neigh_release(n);
1247 goto out;
1248 }
1249
1250 ipv6_stub->ndisc_send_na(dev, n, saddr, &msg->target,
1251 !!in6_dev->cnf.forwarding,
1252 true, false, false);
1253 neigh_release(n);
1254 } else if (vxlan->flags & VXLAN_F_L3MISS) {
1255 ipa.sin6.sin6_addr = *daddr;
1256 ipa.sa.sa_family = AF_INET6;
1257 vxlan_ip_miss(dev, &ipa);
1258 }
1259
1260out:
1261 consume_skb(skb);
1262 return NETDEV_TX_OK;
1263}
1264#endif
1265
e4f67add
DS		 1266static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1267{
1268 struct vxlan_dev *vxlan = netdev_priv(dev);
1269 struct neighbour *n;
e4f67add
DS		 1270
1271 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1272 return false;
1273
1274 n = NULL;
1275 switch (ntohs(eth_hdr(skb)->h_proto)) {
1276 case ETH_P_IP:
e15a00aa
CW		 1277 {
1278 struct iphdr *pip;
1279
e4f67add
DS		 1280 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1281 return false;
1282 pip = ip_hdr(skb);
1283 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
e4c7ed41
CW		 1284 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1285 union vxlan_addr ipa = {
1286 .sin.sin_addr.s_addr = pip->daddr,
1287 .sa.sa_family = AF_INET,
1288 };
1289
1290 vxlan_ip_miss(dev, &ipa);
1291 return false;
1292 }
1293
e4f67add 1294 break;
e15a00aa
CW		 1295 }
1296#if IS_ENABLED(CONFIG_IPV6)
1297 case ETH_P_IPV6:
1298 {
1299 struct ipv6hdr *pip6;
1300
1301 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1302 return false;
1303 pip6 = ipv6_hdr(skb);
1304 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1305 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1306 union vxlan_addr ipa = {
1307 .sin6.sin6_addr = pip6->daddr,
1308 .sa.sa_family = AF_INET6,
1309 };
1310
1311 vxlan_ip_miss(dev, &ipa);
1312 return false;
1313 }
1314
1315 break;
1316 }
1317#endif
e4f67add
DS		 1318 default:
1319 return false;
1320 }
1321
1322 if (n) {
1323 bool diff;
1324
7367d0b5 1325 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
e4f67add
DS		 1326 if (diff) {
1327 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1328 dev->addr_len);
1329 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1330 }
1331 neigh_release(n);
1332 return diff;
e4c7ed41
CW		 1333 }
1334
e4f67add
DS		 1335 return false;
1336}
1337
553675fb 1338static void vxlan_sock_put(struct sk_buff *skb)
1cad8715 1339{
1340 sock_put(skb->sk);
1341}
1342
1343/* On transmit, associate with the tunnel socket */
49560532 1344static void vxlan_set_owner(struct sock *sk, struct sk_buff *skb)
1cad8715 1345{
1cad8715 1346 skb_orphan(skb);
1347 sock_hold(sk);
1348 skb->sk = sk;
553675fb 1349 skb->destructor = vxlan_sock_put;
1cad8715 1350}
1351
05f47d69 1352/* Compute source port for outgoing packet
1353 * first choice to use L4 flow hash since it will spread
1354 * better and maybe available from hardware
1355 * secondary choice is to use jhash on the Ethernet header
1356 */
49560532 1357__be16 vxlan_src_port(__u16 port_min, __u16 port_max, struct sk_buff *skb)
05f47d69 1358{
49560532 1359 unsigned int range = (port_max - port_min) + 1;
05f47d69 1360 u32 hash;
1361
1362 hash = skb_get_rxhash(skb);
1363 if (!hash)
1364 hash = jhash(skb->data, 2 * ETH_ALEN,
1365 (__force u32) skb->protocol);
1366
49560532 1367 return htons((((u64) hash * range) >> 32) + port_min);
05f47d69 1368}
49560532 1369EXPORT_SYMBOL_GPL(vxlan_src_port);
05f47d69 1370
05c0db08
PS		 1371static int handle_offloads(struct sk_buff *skb)
1372{
1373 if (skb_is_gso(skb)) {
1374 int err = skb_unclone(skb, GFP_ATOMIC);
1375 if (unlikely(err))
1376 return err;
1377
f6ace502 1378 skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_TUNNEL;
05c0db08
PS		 1379 } else if (skb->ip_summed != CHECKSUM_PARTIAL)
1380 skb->ip_summed = CHECKSUM_NONE;
1381
1382 return 0;
1383}
1384
e4c7ed41 1385#if IS_ENABLED(CONFIG_IPV6)
11796187 1386static int vxlan6_xmit_skb(struct vxlan_sock *vs,
e4c7ed41
CW		 1387 struct dst_entry *dst, struct sk_buff *skb,
1388 struct net_device *dev, struct in6_addr *saddr,
1389 struct in6_addr *daddr, __u8 prio, __u8 ttl,
1390 __be16 src_port, __be16 dst_port, __be32 vni)
1391{
1392 struct ipv6hdr *ip6h;
1393 struct vxlanhdr *vxh;
1394 struct udphdr *uh;
1395 int min_headroom;
1396 int err;
1397
1398 if (!skb->encapsulation) {
1399 skb_reset_inner_headers(skb);
1400 skb->encapsulation = 1;
1401 }
1402
963a88b3
ND		 1403 skb_scrub_packet(skb, false);
1404
e4c7ed41
CW		 1405 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1406 + VXLAN_HLEN + sizeof(struct ipv6hdr)
1407 + (vlan_tx_tag_present(skb) ? VLAN_HLEN : 0);
1408
1409 /* Need space for new headers (invalidates iph ptr) */
1410 err = skb_cow_head(skb, min_headroom);
1411 if (unlikely(err))
1412 return err;
1413
1414 if (vlan_tx_tag_present(skb)) {
1415 if (WARN_ON(!__vlan_put_tag(skb,
1416 skb->vlan_proto,
1417 vlan_tx_tag_get(skb))))
1418 return -ENOMEM;
1419
1420 skb->vlan_tci = 0;
1421 }
1422
1423 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1424 vxh->vx_flags = htonl(VXLAN_FLAGS);
1425 vxh->vx_vni = vni;
1426
1427 __skb_push(skb, sizeof(*uh));
1428 skb_reset_transport_header(skb);
1429 uh = udp_hdr(skb);
1430
1431 uh->dest = dst_port;
1432 uh->source = src_port;
1433
1434 uh->len = htons(skb->len);
1435 uh->check = 0;
1436
1437 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1438 IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED |
1439 IPSKB_REROUTED);
e4c7ed41
CW		 1440 skb_dst_set(skb, dst);
1441
1442 if (!skb_is_gso(skb) && !(dst->dev->features & NETIF_F_IPV6_CSUM)) {
1443 __wsum csum = skb_checksum(skb, 0, skb->len, 0);
1444 skb->ip_summed = CHECKSUM_UNNECESSARY;
1445 uh->check = csum_ipv6_magic(saddr, daddr, skb->len,
1446 IPPROTO_UDP, csum);
1447 if (uh->check == 0)
1448 uh->check = CSUM_MANGLED_0;
1449 } else {
1450 skb->ip_summed = CHECKSUM_PARTIAL;
1451 skb->csum_start = skb_transport_header(skb) - skb->head;
1452 skb->csum_offset = offsetof(struct udphdr, check);
1453 uh->check = ~csum_ipv6_magic(saddr, daddr,
1454 skb->len, IPPROTO_UDP, 0);
1455 }
1456
1457 __skb_push(skb, sizeof(*ip6h));
1458 skb_reset_network_header(skb);
1459 ip6h = ipv6_hdr(skb);
1460 ip6h->version = 6;
1461 ip6h->priority = prio;
1462 ip6h->flow_lbl[0] = 0;
1463 ip6h->flow_lbl[1] = 0;
1464 ip6h->flow_lbl[2] = 0;
1465 ip6h->payload_len = htons(skb->len);
1466 ip6h->nexthdr = IPPROTO_UDP;
1467 ip6h->hop_limit = ttl;
1468 ip6h->daddr = *daddr;
1469 ip6h->saddr = *saddr;
1470
1471 vxlan_set_owner(vs->sock->sk, skb);
1472
1473 err = handle_offloads(skb);
1474 if (err)
1475 return err;
1476
1477 ip6tunnel_xmit(skb, dev);
1478 return 0;
1479}
1480#endif
1481
11796187 1482int vxlan_xmit_skb(struct vxlan_sock *vs,
49560532
PS		 1483 struct rtable *rt, struct sk_buff *skb,
1484 __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
1485 __be16 src_port, __be16 dst_port, __be32 vni)
1486{
1487 struct vxlanhdr *vxh;
1488 struct udphdr *uh;
649c5b8b 1489 int min_headroom;
49560532
PS		 1490 int err;
1491
1492 if (!skb->encapsulation) {
1493 skb_reset_inner_headers(skb);
1494 skb->encapsulation = 1;
1495 }
1496
649c5b8b 1497 min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
1eaa8178
PS		 1498 + VXLAN_HLEN + sizeof(struct iphdr)
1499 + (vlan_tx_tag_present(skb) ? VLAN_HLEN : 0);
649c5b8b
PS		 1500
1501 /* Need space for new headers (invalidates iph ptr) */
1502 err = skb_cow_head(skb, min_headroom);
1503 if (unlikely(err))
1504 return err;
1505
1eaa8178
PS		 1506 if (vlan_tx_tag_present(skb)) {
1507 if (WARN_ON(!__vlan_put_tag(skb,
1508 skb->vlan_proto,
1509 vlan_tx_tag_get(skb))))
1510 return -ENOMEM;
1511
1512 skb->vlan_tci = 0;
1513 }
1514
49560532
PS		 1515 vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1516 vxh->vx_flags = htonl(VXLAN_FLAGS);
1517 vxh->vx_vni = vni;
1518
1519 __skb_push(skb, sizeof(*uh));
1520 skb_reset_transport_header(skb);
1521 uh = udp_hdr(skb);
1522
1523 uh->dest = dst_port;
1524 uh->source = src_port;
1525
1526 uh->len = htons(skb->len);
1527 uh->check = 0;
1528
1529 vxlan_set_owner(vs->sock->sk, skb);
1530
1531 err = handle_offloads(skb);
1532 if (err)
1533 return err;
1534
963a88b3
ND		 1535 return iptunnel_xmit(rt, skb, src, dst, IPPROTO_UDP, tos, ttl, df,
1536 false);
49560532
PS		 1537}
1538EXPORT_SYMBOL_GPL(vxlan_xmit_skb);
1539
9dcc71e1
SS		 1540/* Bypass encapsulation if the destination is local */
1541static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1542 struct vxlan_dev *dst_vxlan)
1543{
1544 struct pcpu_tstats *tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1545 struct pcpu_tstats *rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
e4c7ed41
CW		 1546 union vxlan_addr loopback;
1547 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
9dcc71e1
SS		 1548
1549 skb->pkt_type = PACKET_HOST;
1550 skb->encapsulation = 0;
1551 skb->dev = dst_vxlan->dev;
1552 __skb_pull(skb, skb_network_offset(skb));
1553
e4c7ed41
CW		 1554 if (remote_ip->sa.sa_family == AF_INET) {
1555 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1556 loopback.sa.sa_family = AF_INET;
1557#if IS_ENABLED(CONFIG_IPV6)
1558 } else {
1559 loopback.sin6.sin6_addr = in6addr_loopback;
1560 loopback.sa.sa_family = AF_INET6;
1561#endif
1562 }
1563
9dcc71e1 1564 if (dst_vxlan->flags & VXLAN_F_LEARN)
e4c7ed41 1565 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
9dcc71e1
SS		 1566
1567 u64_stats_update_begin(&tx_stats->syncp);
1568 tx_stats->tx_packets++;
1569 tx_stats->tx_bytes += skb->len;
1570 u64_stats_update_end(&tx_stats->syncp);
1571
1572 if (netif_rx(skb) == NET_RX_SUCCESS) {
1573 u64_stats_update_begin(&rx_stats->syncp);
1574 rx_stats->rx_packets++;
1575 rx_stats->rx_bytes += skb->len;
1576 u64_stats_update_end(&rx_stats->syncp);
1577 } else {
1578 skb->dev->stats.rx_dropped++;
1579 }
1580}
1581
4ad16930
SH		 1582static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1583 struct vxlan_rdst *rdst, bool did_rsc)
d342894c 1584{
1585 struct vxlan_dev *vxlan = netdev_priv(dev);
e4c7ed41 1586 struct rtable *rt = NULL;
d342894c 1587 const struct iphdr *old_iph;
d342894c 1588 struct flowi4 fl4;
e4c7ed41
CW		 1589 union vxlan_addr *dst;
1590 __be16 src_port = 0, dst_port;
234f5b73 1591 u32 vni;
d342894c 1592 __be16 df = 0;
1593 __u8 tos, ttl;
0e6fbc5b 1594 int err;
d342894c 1595
823aa873 1596 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->dst_port;
6681712d 1597 vni = rdst->remote_vni;
e4c7ed41 1598 dst = &rdst->remote_ip;
e4f67add 1599
e4c7ed41 1600 if (vxlan_addr_any(dst)) {
e4f67add 1601 if (did_rsc) {
e4f67add 1602 /* short-circuited back to local bridge */
9dcc71e1 1603 vxlan_encap_bypass(skb, vxlan, vxlan);
4ad16930 1604 return;
e4f67add 1605 }
ef59febe 1606 goto drop;
e4f67add 1607 }
ef59febe 1608
d342894c 1609 old_iph = ip_hdr(skb);
1610
d342894c 1611 ttl = vxlan->ttl;
e4c7ed41 1612 if (!ttl && vxlan_addr_multicast(dst))
d342894c 1613 ttl = 1;
1614
1615 tos = vxlan->tos;
1616 if (tos == 1)
206aaafc 1617 tos = ip_tunnel_get_dsfield(old_iph, skb);
d342894c 1618
49560532 1619 src_port = vxlan_src_port(vxlan->port_min, vxlan->port_max, skb);
d342894c 1620
e4c7ed41
CW		 1621 if (dst->sa.sa_family == AF_INET) {
1622 memset(&fl4, 0, sizeof(fl4));
1623 fl4.flowi4_oif = rdst->remote_ifindex;
1624 fl4.flowi4_tos = RT_TOS(tos);
1625 fl4.daddr = dst->sin.sin_addr.s_addr;
1626 fl4.saddr = vxlan->saddr.sin.sin_addr.s_addr;
1627
1628 rt = ip_route_output_key(dev_net(dev), &fl4);
1629 if (IS_ERR(rt)) {
1630 netdev_dbg(dev, "no route to %pI4\n",
1631 &dst->sin.sin_addr.s_addr);
1632 dev->stats.tx_carrier_errors++;
1633 goto tx_error;
1634 }
d342894c 1635
e4c7ed41
CW		 1636 if (rt->dst.dev == dev) {
1637 netdev_dbg(dev, "circular route to %pI4\n",
1638 &dst->sin.sin_addr.s_addr);
1639 dev->stats.collisions++;
1640 goto tx_error;
1641 }
1642
1643 /* Bypass encapsulation if the destination is local */
1644 if (rt->rt_flags & RTCF_LOCAL &&
1645 !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1646 struct vxlan_dev *dst_vxlan;
1647
1648 ip_rt_put(rt);
1649 dst_vxlan = vxlan_find_vni(dev_net(dev), vni, dst_port);
1650 if (!dst_vxlan)
1651 goto tx_error;
1652 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1653 return;
1654 }
1655
1656 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
1657 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
d342894c 1658
11796187 1659 err = vxlan_xmit_skb(vxlan->vn_sock, rt, skb,
e4c7ed41
CW		 1660 fl4.saddr, dst->sin.sin_addr.s_addr,
1661 tos, ttl, df, src_port, dst_port,
1662 htonl(vni << 8));
9dcc71e1 1663
e4c7ed41
CW		 1664 if (err < 0)
1665 goto rt_tx_error;
1666 iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
1667#if IS_ENABLED(CONFIG_IPV6)
1668 } else {
1669 struct sock *sk = vxlan->vn_sock->sock->sk;
1670 struct dst_entry *ndst;
1671 struct flowi6 fl6;
1672 u32 flags;
1673
1674 memset(&fl6, 0, sizeof(fl6));
1675 fl6.flowi6_oif = rdst->remote_ifindex;
1676 fl6.daddr = dst->sin6.sin6_addr;
1677 fl6.saddr = vxlan->saddr.sin6.sin6_addr;
8c1bb79f 1678 fl6.flowi6_proto = IPPROTO_UDP;
e4c7ed41
CW		 1679
1680 if (ipv6_stub->ipv6_dst_lookup(sk, &ndst, &fl6)) {
1681 netdev_dbg(dev, "no route to %pI6\n",
1682 &dst->sin6.sin6_addr);
1683 dev->stats.tx_carrier_errors++;
9dcc71e1 1684 goto tx_error;
e4c7ed41 1685 }
d342894c 1686
e4c7ed41
CW		 1687 if (ndst->dev == dev) {
1688 netdev_dbg(dev, "circular route to %pI6\n",
1689 &dst->sin6.sin6_addr);
1690 dst_release(ndst);
1691 dev->stats.collisions++;
1692 goto tx_error;
1693 }
0e6fbc5b 1694
e4c7ed41
CW		 1695 /* Bypass encapsulation if the destination is local */
1696 flags = ((struct rt6_info *)ndst)->rt6i_flags;
1697 if (flags & RTF_LOCAL &&
1698 !(flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
1699 struct vxlan_dev *dst_vxlan;
1700
1701 dst_release(ndst);
1702 dst_vxlan = vxlan_find_vni(dev_net(dev), vni, dst_port);
1703 if (!dst_vxlan)
1704 goto tx_error;
1705 vxlan_encap_bypass(skb, vxlan, dst_vxlan);
1706 return;
1707 }
49560532 1708
e4c7ed41
CW		 1709 ttl = ttl ? : ip6_dst_hoplimit(ndst);
1710
11796187 1711 err = vxlan6_xmit_skb(vxlan->vn_sock, ndst, skb,
e4c7ed41
CW		 1712 dev, &fl6.saddr, &fl6.daddr, 0, ttl,
1713 src_port, dst_port, htonl(vni << 8));
1714#endif
1715 }
0e6fbc5b 1716
4ad16930 1717 return;
d342894c 1718
1719drop:
1720 dev->stats.tx_dropped++;
1721 goto tx_free;
1722
49560532
PS		 1723rt_tx_error:
1724 ip_rt_put(rt);
d342894c 1725tx_error:
1726 dev->stats.tx_errors++;
1727tx_free:
1728 dev_kfree_skb(skb);
d342894c 1729}
1730
6681712d
DS		 1731/* Transmit local packets over Vxlan
1732 *
1733 * Outer IP header inherits ECN and DF from inner header.
1734 * Outer UDP destination is the VXLAN assigned port.
1735 * source port is based on hash of flow
1736 */
1737static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
1738{
1739 struct vxlan_dev *vxlan = netdev_priv(dev);
1740 struct ethhdr *eth;
1741 bool did_rsc = false;
afbd8bae 1742 struct vxlan_rdst *rdst;
6681712d 1743 struct vxlan_fdb *f;
6681712d
DS		 1744
1745 skb_reset_mac_header(skb);
1746 eth = eth_hdr(skb);
1747
f564f45c
CW		 1748 if ((vxlan->flags & VXLAN_F_PROXY)) {
1749 if (ntohs(eth->h_proto) == ETH_P_ARP)
1750 return arp_reduce(dev, skb);
1751#if IS_ENABLED(CONFIG_IPV6)
1752 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
1753 skb->len >= sizeof(struct ipv6hdr) + sizeof(struct nd_msg) &&
1754 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
1755 struct nd_msg *msg;
1756
1757 msg = (struct nd_msg *)skb_transport_header(skb);
1758 if (msg->icmph.icmp6_code == 0 &&
1759 msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
1760 return neigh_reduce(dev, skb);
1761 }
1762#endif
1763 }
6681712d
DS		 1764
1765 f = vxlan_find_mac(vxlan, eth->h_dest);
ae884082
DS		 1766 did_rsc = false;
1767
1768 if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
e15a00aa
CW		 1769 (ntohs(eth->h_proto) == ETH_P_IP ||
1770 ntohs(eth->h_proto) == ETH_P_IPV6)) {
ae884082
DS		 1771 did_rsc = route_shortcircuit(dev, skb);
1772 if (did_rsc)
1773 f = vxlan_find_mac(vxlan, eth->h_dest);
1774 }
1775
6681712d 1776 if (f == NULL) {
afbd8bae
MR		 1777 f = vxlan_find_mac(vxlan, all_zeros_mac);
1778 if (f == NULL) {
1779 if ((vxlan->flags & VXLAN_F_L2MISS) &&
1780 !is_multicast_ether_addr(eth->h_dest))
1781 vxlan_fdb_miss(vxlan, eth->h_dest);
1782
1783 dev->stats.tx_dropped++;
1784 dev_kfree_skb(skb);
1785 return NETDEV_TX_OK;
1786 }
1787 }
6681712d 1788
afbd8bae
MR		 1789 list_for_each_entry_rcu(rdst, &f->remotes, list) {
1790 struct sk_buff *skb1;
6681712d 1791
afbd8bae
MR		 1792 skb1 = skb_clone(skb, GFP_ATOMIC);
1793 if (skb1)
1794 vxlan_xmit_one(skb1, dev, rdst, did_rsc);
6681712d
DS		 1795 }
1796
afbd8bae 1797 dev_kfree_skb(skb);
4ad16930 1798 return NETDEV_TX_OK;
6681712d
DS		 1799}
1800
d342894c 1801/* Walk the forwarding table and purge stale entries */
1802static void vxlan_cleanup(unsigned long arg)
1803{
1804 struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
1805 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
1806 unsigned int h;
1807
1808 if (!netif_running(vxlan->dev))
1809 return;
1810
1811 spin_lock_bh(&vxlan->hash_lock);
1812 for (h = 0; h < FDB_HASH_SIZE; ++h) {
1813 struct hlist_node *p, *n;
1814 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
1815 struct vxlan_fdb *f
1816 = container_of(p, struct vxlan_fdb, hlist);
1817 unsigned long timeout;
1818
3c172868 1819 if (f->state & NUD_PERMANENT)
d342894c 1820 continue;
1821
1822 timeout = f->used + vxlan->age_interval * HZ;
1823 if (time_before_eq(timeout, jiffies)) {
1824 netdev_dbg(vxlan->dev,
1825 "garbage collect %pM\n",
1826 f->eth_addr);
1827 f->state = NUD_STALE;
1828 vxlan_fdb_destroy(vxlan, f);
1829 } else if (time_before(timeout, next_timer))
1830 next_timer = timeout;
1831 }
1832 }
1833 spin_unlock_bh(&vxlan->hash_lock);
1834
1835 mod_timer(&vxlan->age_timer, next_timer);
1836}
1837
9c2e24e1
PS		 1838static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
1839{
1840 __u32 vni = vxlan->default_dst.remote_vni;
1841
1842 vxlan->vn_sock = vs;
1843 hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
1844}
1845
d342894c 1846/* Setup stats when device is created */
1847static int vxlan_init(struct net_device *dev)
1848{
1c51a915
SH		 1849 struct vxlan_dev *vxlan = netdev_priv(dev);
1850 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
1851 struct vxlan_sock *vs;
1c51a915 1852
e8171045
PS		 1853 dev->tstats = alloc_percpu(struct pcpu_tstats);
1854 if (!dev->tstats)
d342894c 1855 return -ENOMEM;
1856
1c51a915 1857 spin_lock(&vn->sock_lock);
9c2e24e1 1858 vs = vxlan_find_sock(dev_net(dev), vxlan->dst_port);
1c51a915
SH		 1859 if (vs) {
1860 /* If we have a socket with same port already, reuse it */
1861 atomic_inc(&vs->refcnt);
9c2e24e1 1862 vxlan_vs_add_dev(vs, vxlan);
1c51a915
SH		 1863 } else {
1864 /* otherwise make new socket outside of RTNL */
1865 dev_hold(dev);
1866 queue_work(vxlan_wq, &vxlan->sock_work);
1867 }
1868 spin_unlock(&vn->sock_lock);
1869
d342894c 1870 return 0;
1871}
1872
ba609e9b 1873static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
afbd8bae
MR		 1874{
1875 struct vxlan_fdb *f;
1876
1877 spin_lock_bh(&vxlan->hash_lock);
1878 f = __vxlan_find_mac(vxlan, all_zeros_mac);
1879 if (f)
1880 vxlan_fdb_destroy(vxlan, f);
1881 spin_unlock_bh(&vxlan->hash_lock);
1882}
1883
ebf4063e
SH		 1884static void vxlan_uninit(struct net_device *dev)
1885{
1886 struct vxlan_dev *vxlan = netdev_priv(dev);
ebf4063e
SH		 1887 struct vxlan_sock *vs = vxlan->vn_sock;
1888
ba609e9b 1889 vxlan_fdb_delete_default(vxlan);
afbd8bae 1890
ebf4063e 1891 if (vs)
012a5729 1892 vxlan_sock_release(vs);
ebf4063e
SH		 1893 free_percpu(dev->tstats);
1894}
1895
d342894c 1896/* Start ageing timer and join group when device is brought up */
1897static int vxlan_open(struct net_device *dev)
1898{
3fc2de2f 1899 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
d342894c 1900 struct vxlan_dev *vxlan = netdev_priv(dev);
1c51a915
SH		 1901 struct vxlan_sock *vs = vxlan->vn_sock;
1902
1903 /* socket hasn't been created */
1904 if (!vs)
1905 return -ENOTCONN;
d342894c 1906
e4c7ed41
CW		 1907 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
1908 vxlan_group_used(vn, &vxlan->default_dst.remote_ip)) {
1c51a915 1909 vxlan_sock_hold(vs);
7c47cedf 1910 dev_hold(dev);
3fc2de2f 1911 queue_work(vxlan_wq, &vxlan->igmp_join);
d342894c 1912 }
1913
1914 if (vxlan->age_interval)
1915 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
1916
1917 return 0;
1918}
1919
1920/* Purge the forwarding table */
1921static void vxlan_flush(struct vxlan_dev *vxlan)
1922{
31fec5aa 1923 unsigned int h;
d342894c 1924
1925 spin_lock_bh(&vxlan->hash_lock);
1926 for (h = 0; h < FDB_HASH_SIZE; ++h) {
1927 struct hlist_node *p, *n;
1928 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
1929 struct vxlan_fdb *f
1930 = container_of(p, struct vxlan_fdb, hlist);
afbd8bae
MR		 1931 /* the all_zeros_mac entry is deleted at vxlan_uninit */
1932 if (!is_zero_ether_addr(f->eth_addr))
1933 vxlan_fdb_destroy(vxlan, f);
d342894c 1934 }
1935 }
1936 spin_unlock_bh(&vxlan->hash_lock);
1937}
1938
1939/* Cleanup timer and forwarding table on shutdown */
1940static int vxlan_stop(struct net_device *dev)
1941{
3fc2de2f 1942 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
d342894c 1943 struct vxlan_dev *vxlan = netdev_priv(dev);
1c51a915 1944 struct vxlan_sock *vs = vxlan->vn_sock;
d342894c 1945
e4c7ed41
CW		 1946 if (vs && vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
1947 ! vxlan_group_used(vn, &vxlan->default_dst.remote_ip)) {
1c51a915 1948 vxlan_sock_hold(vs);
7c47cedf 1949 dev_hold(dev);
3fc2de2f 1950 queue_work(vxlan_wq, &vxlan->igmp_leave);
7c47cedf 1951 }
d342894c 1952
1953 del_timer_sync(&vxlan->age_timer);
1954
1955 vxlan_flush(vxlan);
1956
1957 return 0;
1958}
1959
d342894c 1960/* Stub, nothing needs to be done. */
1961static void vxlan_set_multicast_list(struct net_device *dev)
1962{
1963}
1964
1965static const struct net_device_ops vxlan_netdev_ops = {
1966 .ndo_init = vxlan_init,
ebf4063e 1967 .ndo_uninit = vxlan_uninit,
d342894c 1968 .ndo_open = vxlan_open,
1969 .ndo_stop = vxlan_stop,
1970 .ndo_start_xmit = vxlan_xmit,
e8171045 1971 .ndo_get_stats64 = ip_tunnel_get_stats64,
d342894c 1972 .ndo_set_rx_mode = vxlan_set_multicast_list,
1973 .ndo_change_mtu = eth_change_mtu,
1974 .ndo_validate_addr = eth_validate_addr,
1975 .ndo_set_mac_address = eth_mac_addr,
1976 .ndo_fdb_add = vxlan_fdb_add,
1977 .ndo_fdb_del = vxlan_fdb_delete,
1978 .ndo_fdb_dump = vxlan_fdb_dump,
1979};
1980
1981/* Info for udev, that this is a virtual tunnel endpoint */
1982static struct device_type vxlan_type = {
1983 .name = "vxlan",
1984};
1985
d342894c 1986/* Initialize the device structure. */
1987static void vxlan_setup(struct net_device *dev)
1988{
1989 struct vxlan_dev *vxlan = netdev_priv(dev);
31fec5aa 1990 unsigned int h;
05f47d69 1991 int low, high;
d342894c 1992
1993 eth_hw_addr_random(dev);
1994 ether_setup(dev);
e4c7ed41
CW		 1995 if (vxlan->default_dst.remote_ip.sa.sa_family == AF_INET6)
1996 dev->hard_header_len = ETH_HLEN + VXLAN6_HEADROOM;
1997 else
1998 dev->hard_header_len = ETH_HLEN + VXLAN_HEADROOM;
d342894c 1999
2000 dev->netdev_ops = &vxlan_netdev_ops;
ebf4063e 2001 dev->destructor = free_netdev;
d342894c 2002 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2003
2004 dev->tx_queue_len = 0;
2005 dev->features |= NETIF_F_LLTX;
2006 dev->features |= NETIF_F_NETNS_LOCAL;
d6727fe3 2007 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
0afb1666 2008 dev->features |= NETIF_F_RXCSUM;
05c0db08 2009 dev->features |= NETIF_F_GSO_SOFTWARE;
0afb1666 2010
1eaa8178
PS		 2011 dev->vlan_features = dev->features;
2012 dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
0afb1666 2013 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
05c0db08 2014 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1eaa8178 2015 dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
d342894c 2016 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
6602d007 2017 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
d342894c 2018
553675fb 2019 INIT_LIST_HEAD(&vxlan->next);
d342894c 2020 spin_lock_init(&vxlan->hash_lock);
3fc2de2f 2021 INIT_WORK(&vxlan->igmp_join, vxlan_igmp_join);
2022 INIT_WORK(&vxlan->igmp_leave, vxlan_igmp_leave);
1c51a915 2023 INIT_WORK(&vxlan->sock_work, vxlan_sock_work);
d342894c 2024
2025 init_timer_deferrable(&vxlan->age_timer);
2026 vxlan->age_timer.function = vxlan_cleanup;
2027 vxlan->age_timer.data = (unsigned long) vxlan;
2028
05f47d69 2029 inet_get_local_port_range(&low, &high);
2030 vxlan->port_min = low;
2031 vxlan->port_max = high;
823aa873 2032 vxlan->dst_port = htons(vxlan_port);
05f47d69 2033
d342894c 2034 vxlan->dev = dev;
2035
2036 for (h = 0; h < FDB_HASH_SIZE; ++h)
2037 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2038}
2039
2040static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2041 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
5d174dd8 2042 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
e4c7ed41 2043 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
d342894c 2044 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
2045 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
e4c7ed41 2046 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
d342894c 2047 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
2048 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
2049 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
2050 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
2051 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
05f47d69 2052 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
e4f67add
DS		 2053 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
2054 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
2055 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
2056 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
823aa873 2057 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
d342894c 2058};
2059
2060static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2061{
2062 if (tb[IFLA_ADDRESS]) {
2063 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2064 pr_debug("invalid link address (not ethernet)\n");
2065 return -EINVAL;
2066 }
2067
2068 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2069 pr_debug("invalid all zero ethernet address\n");
2070 return -EADDRNOTAVAIL;
2071 }
2072 }
2073
2074 if (!data)
2075 return -EINVAL;
2076
2077 if (data[IFLA_VXLAN_ID]) {
2078 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2079 if (id >= VXLAN_VID_MASK)
2080 return -ERANGE;
2081 }
2082
05f47d69 2083 if (data[IFLA_VXLAN_PORT_RANGE]) {
2084 const struct ifla_vxlan_port_range *p
2085 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2086
2087 if (ntohs(p->high) < ntohs(p->low)) {
2088 pr_debug("port range %u .. %u not valid\n",
2089 ntohs(p->low), ntohs(p->high));
2090 return -EINVAL;
2091 }
2092 }
2093
d342894c 2094 return 0;
2095}
2096
1b13c97f
YB		 2097static void vxlan_get_drvinfo(struct net_device *netdev,
2098 struct ethtool_drvinfo *drvinfo)
2099{
2100 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2101 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2102}
2103
2104static const struct ethtool_ops vxlan_ethtool_ops = {
2105 .get_drvinfo = vxlan_get_drvinfo,
2106 .get_link = ethtool_op_get_link,
2107};
2108
553675fb 2109static void vxlan_del_work(struct work_struct *work)
2110{
2111 struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
2112
2113 sk_release_kernel(vs->sock->sk);
2114 kfree_rcu(vs, rcu);
2115}
2116
e4c7ed41
CW		 2117#if IS_ENABLED(CONFIG_IPV6)
2118/* Create UDP socket for encapsulation receive. AF_INET6 socket
2119 * could be used for both IPv4 and IPv6 communications, but
2120 * users may set bindv6only=1.
2121 */
2122static int create_v6_sock(struct net *net, __be16 port, struct socket **psock)
553675fb 2123{
553675fb 2124 struct sock *sk;
e4c7ed41
CW		 2125 struct socket *sock;
2126 struct sockaddr_in6 vxlan_addr = {
2127 .sin6_family = AF_INET6,
2128 .sin6_port = port,
2129 };
2130 int rc, val = 1;
2131
2132 rc = sock_create_kern(AF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock);
2133 if (rc < 0) {
2134 pr_debug("UDPv6 socket create failed\n");
2135 return rc;
2136 }
2137
2138 /* Put in proper namespace */
2139 sk = sock->sk;
2140 sk_change_net(sk, net);
2141
2142 kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY,
2143 (char *)&val, sizeof(val));
2144 rc = kernel_bind(sock, (struct sockaddr *)&vxlan_addr,
2145 sizeof(struct sockaddr_in6));
2146 if (rc < 0) {
2147 pr_debug("bind for UDPv6 socket %pI6:%u (%d)\n",
2148 &vxlan_addr.sin6_addr, ntohs(vxlan_addr.sin6_port), rc);
2149 sk_release_kernel(sk);
2150 return rc;
2151 }
2152 /* At this point, IPv6 module should have been loaded in
2153 * sock_create_kern().
2154 */
2155 BUG_ON(!ipv6_stub);
2156
2157 *psock = sock;
2158 /* Disable multicast loopback */
2159 inet_sk(sk)->mc_loop = 0;
2160 return 0;
2161}
2162
2163#else
2164
2165static int create_v6_sock(struct net *net, __be16 port, struct socket **psock)
2166{
2167 return -EPFNOSUPPORT;
2168}
2169#endif
2170
2171static int create_v4_sock(struct net *net, __be16 port, struct socket **psock)
2172{
2173 struct sock *sk;
2174 struct socket *sock;
553675fb 2175 struct sockaddr_in vxlan_addr = {
2176 .sin_family = AF_INET,
2177 .sin_addr.s_addr = htonl(INADDR_ANY),
bb3fd687 2178 .sin_port = port,
553675fb 2179 };
2180 int rc;
553675fb 2181
2182 /* Create UDP socket for encapsulation receive. */
e4c7ed41 2183 rc = sock_create_kern(AF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock);
553675fb 2184 if (rc < 0) {
2185 pr_debug("UDP socket create failed\n");
e4c7ed41 2186 return rc;
553675fb 2187 }
2188
2189 /* Put in proper namespace */
e4c7ed41 2190 sk = sock->sk;
553675fb 2191 sk_change_net(sk, net);
2192
e4c7ed41 2193 rc = kernel_bind(sock, (struct sockaddr *) &vxlan_addr,
553675fb 2194 sizeof(vxlan_addr));
2195 if (rc < 0) {
2196 pr_debug("bind for UDP socket %pI4:%u (%d)\n",
2197 &vxlan_addr.sin_addr, ntohs(vxlan_addr.sin_port), rc);
2198 sk_release_kernel(sk);
e4c7ed41
CW		 2199 return rc;
2200 }
2201
2202 *psock = sock;
2203 /* Disable multicast loopback */
2204 inet_sk(sk)->mc_loop = 0;
2205 return 0;
2206}
2207
2208/* Create new listen socket if needed */
2209static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port,
2210 vxlan_rcv_t *rcv, void *data, bool ipv6)
2211{
2212 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2213 struct vxlan_sock *vs;
2214 struct socket *sock;
2215 struct sock *sk;
2216 int rc = 0;
2217 unsigned int h;
2218
2219 vs = kmalloc(sizeof(*vs), GFP_KERNEL);
2220 if (!vs)
2221 return ERR_PTR(-ENOMEM);
2222
2223 for (h = 0; h < VNI_HASH_SIZE; ++h)
2224 INIT_HLIST_HEAD(&vs->vni_list[h]);
2225
2226 INIT_WORK(&vs->del_work, vxlan_del_work);
2227
2228 if (ipv6)
2229 rc = create_v6_sock(net, port, &sock);
2230 else
2231 rc = create_v4_sock(net, port, &sock);
2232 if (rc < 0) {
553675fb 2233 kfree(vs);
2234 return ERR_PTR(rc);
2235 }
e4c7ed41
CW		 2236
2237 vs->sock = sock;
2238 sk = sock->sk;
9c2e24e1 2239 atomic_set(&vs->refcnt, 1);
5cfccc5a 2240 vs->rcv = rcv;
012a5729 2241 vs->data = data;
430eda6d
PS		 2242 smp_wmb();
2243 vs->sock->sk->sk_user_data = vs;
553675fb 2244
9c2e24e1
PS		 2245 spin_lock(&vn->sock_lock);
2246 hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2247 spin_unlock(&vn->sock_lock);
553675fb 2248
2249 /* Mark socket as an encapsulation socket. */
2250 udp_sk(sk)->encap_type = 1;
2251 udp_sk(sk)->encap_rcv = vxlan_udp_encap_recv;
e4c7ed41
CW		 2252#if IS_ENABLED(CONFIG_IPV6)
2253 if (ipv6)
2254 ipv6_stub->udpv6_encap_enable();
2255 else
2256#endif
2257 udp_encap_enable();
2258
9c2e24e1
PS		 2259 return vs;
2260}
2261
012a5729
PS		 2262struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port,
2263 vxlan_rcv_t *rcv, void *data,
e4c7ed41 2264 bool no_share, bool ipv6)
9c2e24e1
PS		 2265{
2266 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2267 struct vxlan_sock *vs;
2268
e4c7ed41 2269 vs = vxlan_socket_create(net, port, rcv, data, ipv6);
9c2e24e1
PS		 2270 if (!IS_ERR(vs))
2271 return vs;
553675fb 2272
012a5729
PS		 2273 if (no_share) /* Return error if sharing is not allowed. */
2274 return vs;
2275
9c2e24e1
PS		 2276 spin_lock(&vn->sock_lock);
2277 vs = vxlan_find_sock(net, port);
5cfccc5a
PS		 2278 if (vs) {
2279 if (vs->rcv == rcv)
2280 atomic_inc(&vs->refcnt);
2281 else
2282 vs = ERR_PTR(-EBUSY);
2283 }
2284 spin_unlock(&vn->sock_lock);
2285
2286 if (!vs)
9c2e24e1
PS		 2287 vs = ERR_PTR(-EINVAL);
2288
553675fb 2289 return vs;
2290}
012a5729 2291EXPORT_SYMBOL_GPL(vxlan_sock_add);
553675fb 2292
1c51a915
SH		 2293/* Scheduled at device creation to bind to a socket */
2294static void vxlan_sock_work(struct work_struct *work)
2295{
9c2e24e1
PS		 2296 struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, sock_work);
2297 struct net *net = dev_net(vxlan->dev);
1c51a915 2298 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
9c2e24e1
PS		 2299 __be16 port = vxlan->dst_port;
2300 struct vxlan_sock *nvs;
1c51a915 2301
e4c7ed41 2302 nvs = vxlan_sock_add(net, port, vxlan_rcv, NULL, false, vxlan->flags & VXLAN_F_IPV6);
1c51a915 2303 spin_lock(&vn->sock_lock);
9c2e24e1
PS		 2304 if (!IS_ERR(nvs))
2305 vxlan_vs_add_dev(nvs, vxlan);
2306 spin_unlock(&vn->sock_lock);
2307
2308 dev_put(vxlan->dev);
1c51a915
SH		 2309}
2310
d342894c 2311static int vxlan_newlink(struct net *net, struct net_device *dev,
2312 struct nlattr *tb[], struct nlattr *data[])
2313{
553675fb 2314 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
d342894c 2315 struct vxlan_dev *vxlan = netdev_priv(dev);
c7995c43 2316 struct vxlan_rdst *dst = &vxlan->default_dst;
d342894c 2317 __u32 vni;
2318 int err;
e4c7ed41 2319 bool use_ipv6 = false;
d342894c 2320
2321 if (!data[IFLA_VXLAN_ID])
2322 return -EINVAL;
2323
2324 vni = nla_get_u32(data[IFLA_VXLAN_ID]);
c7995c43 2325 dst->remote_vni = vni;
d342894c 2326
e4c7ed41
CW		 2327 if (data[IFLA_VXLAN_GROUP]) {
2328 dst->remote_ip.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_GROUP]);
2329 dst->remote_ip.sa.sa_family = AF_INET;
2330 } else if (data[IFLA_VXLAN_GROUP6]) {
2331 if (!IS_ENABLED(CONFIG_IPV6))
2332 return -EPFNOSUPPORT;
2333
2334 nla_memcpy(&dst->remote_ip.sin6.sin6_addr, data[IFLA_VXLAN_GROUP6],
2335 sizeof(struct in6_addr));
2336 dst->remote_ip.sa.sa_family = AF_INET6;
2337 use_ipv6 = true;
2338 }
d342894c 2339
e4c7ed41
CW		 2340 if (data[IFLA_VXLAN_LOCAL]) {
2341 vxlan->saddr.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_LOCAL]);
2342 vxlan->saddr.sa.sa_family = AF_INET;
2343 } else if (data[IFLA_VXLAN_LOCAL6]) {
2344 if (!IS_ENABLED(CONFIG_IPV6))
2345 return -EPFNOSUPPORT;
2346
2347 /* TODO: respect scope id */
2348 nla_memcpy(&vxlan->saddr.sin6.sin6_addr, data[IFLA_VXLAN_LOCAL6],
2349 sizeof(struct in6_addr));
2350 vxlan->saddr.sa.sa_family = AF_INET6;
2351 use_ipv6 = true;
2352 }
d342894c 2353
34e02aa1 2354 if (data[IFLA_VXLAN_LINK] &&
c7995c43 2355 (dst->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]))) {
34e02aa1 2356 struct net_device *lowerdev
c7995c43 2357 = __dev_get_by_index(net, dst->remote_ifindex);
34e02aa1 2358
2359 if (!lowerdev) {
c7995c43 2360 pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
34e02aa1 2361 return -ENODEV;
2362 }
d342894c 2363
e4c7ed41
CW		 2364#if IS_ENABLED(CONFIG_IPV6)
2365 if (use_ipv6) {
2366 struct inet6_dev *idev = __in6_dev_get(lowerdev);
2367 if (idev && idev->cnf.disable_ipv6) {
2368 pr_info("IPv6 is disabled via sysctl\n");
2369 return -EPERM;
2370 }
2371 vxlan->flags |= VXLAN_F_IPV6;
2372 }
2373#endif
2374
34e02aa1 2375 if (!tb[IFLA_MTU])
e4c7ed41 2376 dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
1ba56fb4
AD		 2377
2378 /* update header length based on lower device */
2379 dev->hard_header_len = lowerdev->hard_header_len +
e4c7ed41 2380 (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
d342894c 2381 }
2382
2383 if (data[IFLA_VXLAN_TOS])
2384 vxlan->tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
2385
afb97186
VB		 2386 if (data[IFLA_VXLAN_TTL])
2387 vxlan->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
2388
d342894c 2389 if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
e4f67add 2390 vxlan->flags |= VXLAN_F_LEARN;
d342894c 2391
2392 if (data[IFLA_VXLAN_AGEING])
2393 vxlan->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
2394 else
2395 vxlan->age_interval = FDB_AGE_DEFAULT;
2396
e4f67add
DS		 2397 if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
2398 vxlan->flags |= VXLAN_F_PROXY;
2399
2400 if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
2401 vxlan->flags |= VXLAN_F_RSC;
2402
2403 if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
2404 vxlan->flags |= VXLAN_F_L2MISS;
2405
2406 if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
2407 vxlan->flags |= VXLAN_F_L3MISS;
2408
d342894c 2409 if (data[IFLA_VXLAN_LIMIT])
2410 vxlan->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
2411
05f47d69 2412 if (data[IFLA_VXLAN_PORT_RANGE]) {
2413 const struct ifla_vxlan_port_range *p
2414 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2415 vxlan->port_min = ntohs(p->low);
2416 vxlan->port_max = ntohs(p->high);
2417 }
2418
823aa873 2419 if (data[IFLA_VXLAN_PORT])
2420 vxlan->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
2421
553675fb 2422 if (vxlan_find_vni(net, vni, vxlan->dst_port)) {
2423 pr_info("duplicate VNI %u\n", vni);
2424 return -EEXIST;
2425 }
2426
1b13c97f
YB		 2427 SET_ETHTOOL_OPS(dev, &vxlan_ethtool_ops);
2428
afbd8bae
MR		 2429 /* create an fdb entry for default destination */
2430 err = vxlan_fdb_create(vxlan, all_zeros_mac,
e4c7ed41 2431 &vxlan->default_dst.remote_ip,
afbd8bae
MR		 2432 NUD_REACHABLE|NUD_PERMANENT,
2433 NLM_F_EXCL|NLM_F_CREATE,
2434 vxlan->dst_port, vxlan->default_dst.remote_vni,
2435 vxlan->default_dst.remote_ifindex, NTF_SELF);
1c51a915 2436 if (err)
553675fb 2437 return err;
d342894c 2438
afbd8bae
MR		 2439 err = register_netdevice(dev);
2440 if (err) {
ba609e9b 2441 vxlan_fdb_delete_default(vxlan);
afbd8bae
MR		 2442 return err;
2443 }
2444
553675fb 2445 list_add(&vxlan->next, &vn->vxlan_list);
553675fb 2446
2447 return 0;
d342894c 2448}
2449
2450static void vxlan_dellink(struct net_device *dev, struct list_head *head)
2451{
fe5c3561 2452 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
d342894c 2453 struct vxlan_dev *vxlan = netdev_priv(dev);
2454
fe5c3561 2455 spin_lock(&vn->sock_lock);
9c2e24e1
PS		 2456 if (!hlist_unhashed(&vxlan->hlist))
2457 hlist_del_rcu(&vxlan->hlist);
fe5c3561 2458 spin_unlock(&vn->sock_lock);
2459
553675fb 2460 list_del(&vxlan->next);
d342894c 2461 unregister_netdevice_queue(dev, head);
2462}
2463
2464static size_t vxlan_get_size(const struct net_device *dev)
2465{
2466
2467 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
e4c7ed41 2468 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
d342894c 2469 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
e4c7ed41 2470 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
d342894c 2471 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
2472 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
2473 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
e4f67add
DS		 2474 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
2475 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
2476 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
2477 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
d342894c 2478 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
2479 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
05f47d69 2480 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
823aa873 2481 nla_total_size(sizeof(__be16))+ /* IFLA_VXLAN_PORT */
d342894c 2482 0;
2483}
2484
2485static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
2486{
2487 const struct vxlan_dev *vxlan = netdev_priv(dev);
c7995c43 2488 const struct vxlan_rdst *dst = &vxlan->default_dst;
05f47d69 2489 struct ifla_vxlan_port_range ports = {
2490 .low = htons(vxlan->port_min),
2491 .high = htons(vxlan->port_max),
2492 };
d342894c 2493
c7995c43 2494 if (nla_put_u32(skb, IFLA_VXLAN_ID, dst->remote_vni))
d342894c 2495 goto nla_put_failure;
2496
e4c7ed41
CW		 2497 if (!vxlan_addr_any(&dst->remote_ip)) {
2498 if (dst->remote_ip.sa.sa_family == AF_INET) {
2499 if (nla_put_be32(skb, IFLA_VXLAN_GROUP,
2500 dst->remote_ip.sin.sin_addr.s_addr))
2501 goto nla_put_failure;
2502#if IS_ENABLED(CONFIG_IPV6)
2503 } else {
2504 if (nla_put(skb, IFLA_VXLAN_GROUP6, sizeof(struct in6_addr),
2505 &dst->remote_ip.sin6.sin6_addr))
2506 goto nla_put_failure;
2507#endif
2508 }
2509 }
d342894c 2510
c7995c43 2511 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
d342894c 2512 goto nla_put_failure;
2513
e4c7ed41
CW		 2514 if (!vxlan_addr_any(&vxlan->saddr)) {
2515 if (vxlan->saddr.sa.sa_family == AF_INET) {
2516 if (nla_put_be32(skb, IFLA_VXLAN_LOCAL,
2517 vxlan->saddr.sin.sin_addr.s_addr))
2518 goto nla_put_failure;
2519#if IS_ENABLED(CONFIG_IPV6)
2520 } else {
2521 if (nla_put(skb, IFLA_VXLAN_LOCAL6, sizeof(struct in6_addr),
2522 &vxlan->saddr.sin6.sin6_addr))
2523 goto nla_put_failure;
2524#endif
2525 }
2526 }
d342894c 2527
2528 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->ttl) ||
2529 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->tos) ||
e4f67add
DS		 2530 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
2531 !!(vxlan->flags & VXLAN_F_LEARN)) ||
2532 nla_put_u8(skb, IFLA_VXLAN_PROXY,
2533 !!(vxlan->flags & VXLAN_F_PROXY)) ||
2534 nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
2535 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
2536 !!(vxlan->flags & VXLAN_F_L2MISS)) ||
2537 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
2538 !!(vxlan->flags & VXLAN_F_L3MISS)) ||
d342894c 2539 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->age_interval) ||
823aa873 2540 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->addrmax) ||
2541 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->dst_port))
d342894c 2542 goto nla_put_failure;
2543
05f47d69 2544 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
2545 goto nla_put_failure;
2546
d342894c 2547 return 0;
2548
2549nla_put_failure:
2550 return -EMSGSIZE;
2551}
2552
2553static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
2554 .kind = "vxlan",
2555 .maxtype = IFLA_VXLAN_MAX,
2556 .policy = vxlan_policy,
2557 .priv_size = sizeof(struct vxlan_dev),
2558 .setup = vxlan_setup,
2559 .validate = vxlan_validate,
2560 .newlink = vxlan_newlink,
2561 .dellink = vxlan_dellink,
2562 .get_size = vxlan_get_size,
2563 .fill_info = vxlan_fill_info,
2564};
2565
2566static __net_init int vxlan_init_net(struct net *net)
2567{
2568 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
31fec5aa 2569 unsigned int h;
d342894c 2570
553675fb 2571 INIT_LIST_HEAD(&vn->vxlan_list);
1c51a915 2572 spin_lock_init(&vn->sock_lock);
d342894c 2573
553675fb 2574 for (h = 0; h < PORT_HASH_SIZE; ++h)
2575 INIT_HLIST_HEAD(&vn->sock_list[h]);
d342894c 2576
2577 return 0;
2578}
2579
2580static __net_exit void vxlan_exit_net(struct net *net)
2581{
2582 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
9cb6cb7e 2583 struct vxlan_dev *vxlan;
372675a4 2584 LIST_HEAD(list);
9cb6cb7e
ZM		 2585
2586 rtnl_lock();
553675fb 2587 list_for_each_entry(vxlan, &vn->vxlan_list, next)
372675a4 2588 unregister_netdevice_queue(vxlan->dev, &list);
2589 unregister_netdevice_many(&list);
9cb6cb7e 2590 rtnl_unlock();
d342894c 2591}
2592
2593static struct pernet_operations vxlan_net_ops = {
2594 .init = vxlan_init_net,
2595 .exit = vxlan_exit_net,
2596 .id = &vxlan_net_id,
2597 .size = sizeof(struct vxlan_net),
2598};
2599
2600static int __init vxlan_init_module(void)
2601{
2602 int rc;
2603
758c57d1
SH		 2604 vxlan_wq = alloc_workqueue("vxlan", 0, 0);
2605 if (!vxlan_wq)
2606 return -ENOMEM;
2607
d342894c 2608 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
2609
2610 rc = register_pernet_device(&vxlan_net_ops);
2611 if (rc)
2612 goto out1;
2613
2614 rc = rtnl_link_register(&vxlan_link_ops);
2615 if (rc)
2616 goto out2;
2617
2618 return 0;
2619
2620out2:
2621 unregister_pernet_device(&vxlan_net_ops);
2622out1:
758c57d1 2623 destroy_workqueue(vxlan_wq);
d342894c 2624 return rc;
2625}
7332a13b 2626late_initcall(vxlan_init_module);
d342894c 2627
2628static void __exit vxlan_cleanup_module(void)
2629{
b7153984 2630 rtnl_link_unregister(&vxlan_link_ops);
758c57d1 2631 destroy_workqueue(vxlan_wq);
f89e57c4 2632 unregister_pernet_device(&vxlan_net_ops);
6681712d 2633 rcu_barrier();
d342894c 2634}
2635module_exit(vxlan_cleanup_module);
2636
2637MODULE_LICENSE("GPL");
2638MODULE_VERSION(VXLAN_VERSION);
3b8df3c6 2639MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
d342894c 2640MODULE_ALIAS_RTNL_LINK("vxlan");
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