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staging: rtl8188eu: rename HalSetBrateCfg() - style
[linux/fpc-iii.git] / drivers / net / vxlan.c
blobababba37d735d62b7fe0500983f411d7806baa17
1 /*
2 * VXLAN: Virtual eXtensible Local Area Network
3 *
4 * Copyright (c) 2012-2013 Vyatta Inc.
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.
9 */
10
11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/errno.h>
16 #include <linux/slab.h>
17 #include <linux/udp.h>
18 #include <linux/igmp.h>
19 #include <linux/if_ether.h>
20 #include <linux/ethtool.h>
21 #include <net/arp.h>
22 #include <net/ndisc.h>
23 #include <net/ip.h>
24 #include <net/icmp.h>
25 #include <net/rtnetlink.h>
26 #include <net/inet_ecn.h>
27 #include <net/net_namespace.h>
28 #include <net/netns/generic.h>
29 #include <net/tun_proto.h>
30 #include <net/vxlan.h>
31
32 #if IS_ENABLED(CONFIG_IPV6)
33 #include <net/ip6_tunnel.h>
34 #include <net/ip6_checksum.h>
35 #endif
36
37 #define VXLAN_VERSION "0.1"
38
39 #define PORT_HASH_BITS 8
40 #define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
41 #define FDB_AGE_DEFAULT 300 /* 5 min */
42 #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
43
44 /* UDP port for VXLAN traffic.
45 * The IANA assigned port is 4789, but the Linux default is 8472
46 * for compatibility with early adopters.
47 */
48 static unsigned short vxlan_port __read_mostly = 8472;
49 module_param_named(udp_port, vxlan_port, ushort, 0444);
50 MODULE_PARM_DESC(udp_port, "Destination UDP port");
51
52 static bool log_ecn_error = true;
53 module_param(log_ecn_error, bool, 0644);
54 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
55
56 static unsigned int vxlan_net_id;
57 static struct rtnl_link_ops vxlan_link_ops;
58
59 static const u8 all_zeros_mac[ETH_ALEN + 2];
60
61 static int vxlan_sock_add(struct vxlan_dev *vxlan);
62
63 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan);
64
65 /* per-network namespace private data for this module */
66 struct vxlan_net {
67 struct list_head vxlan_list;
68 struct hlist_head sock_list[PORT_HASH_SIZE];
69 spinlock_t sock_lock;
70 };
71
72 /* Forwarding table entry */
73 struct vxlan_fdb {
74 struct hlist_node hlist; /* linked list of entries */
75 struct rcu_head rcu;
76 unsigned long updated; /* jiffies */
77 unsigned long used;
78 struct list_head remotes;
79 u8 eth_addr[ETH_ALEN];
80 u16 state; /* see ndm_state */
81 __be32 vni;
82 u8 flags; /* see ndm_flags */
83 };
84
85 /* salt for hash table */
86 static u32 vxlan_salt __read_mostly;
87
88 static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
89 {
90 return vs->flags & VXLAN_F_COLLECT_METADATA ||
91 ip_tunnel_collect_metadata();
92 }
93
94 #if IS_ENABLED(CONFIG_IPV6)
95 static inline
96 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
97 {
98 if (a->sa.sa_family != b->sa.sa_family)
99 return false;
100 if (a->sa.sa_family == AF_INET6)
101 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
102 else
103 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
104 }
105
106 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
107 {
108 if (ipa->sa.sa_family == AF_INET6)
109 return ipv6_addr_any(&ipa->sin6.sin6_addr);
110 else
111 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
112 }
113
114 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
115 {
116 if (ipa->sa.sa_family == AF_INET6)
117 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
118 else
119 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
120 }
121
122 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
123 {
124 if (nla_len(nla) >= sizeof(struct in6_addr)) {
125 ip->sin6.sin6_addr = nla_get_in6_addr(nla);
126 ip->sa.sa_family = AF_INET6;
127 return 0;
128 } else if (nla_len(nla) >= sizeof(__be32)) {
129 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
130 ip->sa.sa_family = AF_INET;
131 return 0;
132 } else {
133 return -EAFNOSUPPORT;
134 }
135 }
136
137 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
138 const union vxlan_addr *ip)
139 {
140 if (ip->sa.sa_family == AF_INET6)
141 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
142 else
143 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
144 }
145
146 #else /* !CONFIG_IPV6 */
147
148 static inline
149 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
150 {
151 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
152 }
153
154 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
155 {
156 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
157 }
158
159 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
160 {
161 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
162 }
163
164 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
165 {
166 if (nla_len(nla) >= sizeof(struct in6_addr)) {
167 return -EAFNOSUPPORT;
168 } else if (nla_len(nla) >= sizeof(__be32)) {
169 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
170 ip->sa.sa_family = AF_INET;
171 return 0;
172 } else {
173 return -EAFNOSUPPORT;
174 }
175 }
176
177 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
178 const union vxlan_addr *ip)
179 {
180 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
181 }
182 #endif
183
184 /* Virtual Network hash table head */
185 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, __be32 vni)
186 {
187 return &vs->vni_list[hash_32((__force u32)vni, VNI_HASH_BITS)];
188 }
189
190 /* Socket hash table head */
191 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
192 {
193 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
194
195 return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
196 }
197
198 /* First remote destination for a forwarding entry.
199 * Guaranteed to be non-NULL because remotes are never deleted.
200 */
201 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
202 {
203 return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
204 }
205
206 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
207 {
208 return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
209 }
210
211 /* Find VXLAN socket based on network namespace, address family and UDP port
212 * and enabled unshareable flags.
213 */
214 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
215 __be16 port, u32 flags)
216 {
217 struct vxlan_sock *vs;
218
219 flags &= VXLAN_F_RCV_FLAGS;
220
221 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
222 if (inet_sk(vs->sock->sk)->inet_sport == port &&
223 vxlan_get_sk_family(vs) == family &&
224 vs->flags == flags)
225 return vs;
226 }
227 return NULL;
228 }
229
230 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, int ifindex,
231 __be32 vni)
232 {
233 struct vxlan_dev_node *node;
234
235 /* For flow based devices, map all packets to VNI 0 */
236 if (vs->flags & VXLAN_F_COLLECT_METADATA)
237 vni = 0;
238
239 hlist_for_each_entry_rcu(node, vni_head(vs, vni), hlist) {
240 if (node->vxlan->default_dst.remote_vni != vni)
241 continue;
242
243 if (IS_ENABLED(CONFIG_IPV6)) {
244 const struct vxlan_config *cfg = &node->vxlan->cfg;
245
246 if ((cfg->flags & VXLAN_F_IPV6_LINKLOCAL) &&
247 cfg->remote_ifindex != ifindex)
248 continue;
249 }
250
251 return node->vxlan;
252 }
253
254 return NULL;
255 }
256
257 /* Look up VNI in a per net namespace table */
258 static struct vxlan_dev *vxlan_find_vni(struct net *net, int ifindex,
259 __be32 vni, sa_family_t family,
260 __be16 port, u32 flags)
261 {
262 struct vxlan_sock *vs;
263
264 vs = vxlan_find_sock(net, family, port, flags);
265 if (!vs)
266 return NULL;
267
268 return vxlan_vs_find_vni(vs, ifindex, vni);
269 }
270
271 /* Fill in neighbour message in skbuff. */
272 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
273 const struct vxlan_fdb *fdb,
274 u32 portid, u32 seq, int type, unsigned int flags,
275 const struct vxlan_rdst *rdst)
276 {
277 unsigned long now = jiffies;
278 struct nda_cacheinfo ci;
279 struct nlmsghdr *nlh;
280 struct ndmsg *ndm;
281 bool send_ip, send_eth;
282
283 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
284 if (nlh == NULL)
285 return -EMSGSIZE;
286
287 ndm = nlmsg_data(nlh);
288 memset(ndm, 0, sizeof(*ndm));
289
290 send_eth = send_ip = true;
291
292 if (type == RTM_GETNEIGH) {
293 send_ip = !vxlan_addr_any(&rdst->remote_ip);
294 send_eth = !is_zero_ether_addr(fdb->eth_addr);
295 ndm->ndm_family = send_ip ? rdst->remote_ip.sa.sa_family : AF_INET;
296 } else
297 ndm->ndm_family = AF_BRIDGE;
298 ndm->ndm_state = fdb->state;
299 ndm->ndm_ifindex = vxlan->dev->ifindex;
300 ndm->ndm_flags = fdb->flags;
301 ndm->ndm_type = RTN_UNICAST;
302
303 if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
304 nla_put_s32(skb, NDA_LINK_NETNSID,
305 peernet2id(dev_net(vxlan->dev), vxlan->net)))
306 goto nla_put_failure;
307
308 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
309 goto nla_put_failure;
310
311 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
312 goto nla_put_failure;
313
314 if (rdst->remote_port && rdst->remote_port != vxlan->cfg.dst_port &&
315 nla_put_be16(skb, NDA_PORT, rdst->remote_port))
316 goto nla_put_failure;
317 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
318 nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni)))
319 goto nla_put_failure;
320 if ((vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) && fdb->vni &&
321 nla_put_u32(skb, NDA_SRC_VNI,
322 be32_to_cpu(fdb->vni)))
323 goto nla_put_failure;
324 if (rdst->remote_ifindex &&
325 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
326 goto nla_put_failure;
327
328 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
329 ci.ndm_confirmed = 0;
330 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
331 ci.ndm_refcnt = 0;
332
333 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
334 goto nla_put_failure;
335
336 nlmsg_end(skb, nlh);
337 return 0;
338
339 nla_put_failure:
340 nlmsg_cancel(skb, nlh);
341 return -EMSGSIZE;
342 }
343
344 static inline size_t vxlan_nlmsg_size(void)
345 {
346 return NLMSG_ALIGN(sizeof(struct ndmsg))
347 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
348 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
349 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
350 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
351 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
352 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
353 + nla_total_size(sizeof(struct nda_cacheinfo));
354 }
355
356 static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
357 struct vxlan_rdst *rd, int type)
358 {
359 struct net *net = dev_net(vxlan->dev);
360 struct sk_buff *skb;
361 int err = -ENOBUFS;
362
363 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
364 if (skb == NULL)
365 goto errout;
366
367 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
368 if (err < 0) {
369 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
370 WARN_ON(err == -EMSGSIZE);
371 kfree_skb(skb);
372 goto errout;
373 }
374
375 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
376 return;
377 errout:
378 if (err < 0)
379 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
380 }
381
382 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
383 {
384 struct vxlan_dev *vxlan = netdev_priv(dev);
385 struct vxlan_fdb f = {
386 .state = NUD_STALE,
387 };
388 struct vxlan_rdst remote = {
389 .remote_ip = *ipa, /* goes to NDA_DST */
390 .remote_vni = cpu_to_be32(VXLAN_N_VID),
391 };
392
393 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
394 }
395
396 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
397 {
398 struct vxlan_fdb f = {
399 .state = NUD_STALE,
400 };
401 struct vxlan_rdst remote = { };
402
403 memcpy(f.eth_addr, eth_addr, ETH_ALEN);
404
405 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
406 }
407
408 /* Hash Ethernet address */
409 static u32 eth_hash(const unsigned char *addr)
410 {
411 u64 value = get_unaligned((u64 *)addr);
412
413 /* only want 6 bytes */
414 #ifdef __BIG_ENDIAN
415 value >>= 16;
416 #else
417 value <<= 16;
418 #endif
419 return hash_64(value, FDB_HASH_BITS);
420 }
421
422 static u32 eth_vni_hash(const unsigned char *addr, __be32 vni)
423 {
424 /* use 1 byte of OUI and 3 bytes of NIC */
425 u32 key = get_unaligned((u32 *)(addr + 2));
426
427 return jhash_2words(key, vni, vxlan_salt) & (FDB_HASH_SIZE - 1);
428 }
429
430 /* Hash chain to use given mac address */
431 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
432 const u8 *mac, __be32 vni)
433 {
434 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)
435 return &vxlan->fdb_head[eth_vni_hash(mac, vni)];
436 else
437 return &vxlan->fdb_head[eth_hash(mac)];
438 }
439
440 /* Look up Ethernet address in forwarding table */
441 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
442 const u8 *mac, __be32 vni)
443 {
444 struct hlist_head *head = vxlan_fdb_head(vxlan, mac, vni);
445 struct vxlan_fdb *f;
446
447 hlist_for_each_entry_rcu(f, head, hlist) {
448 if (ether_addr_equal(mac, f->eth_addr)) {
449 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
450 if (vni == f->vni)
451 return f;
452 } else {
453 return f;
454 }
455 }
456 }
457
458 return NULL;
459 }
460
461 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
462 const u8 *mac, __be32 vni)
463 {
464 struct vxlan_fdb *f;
465
466 f = __vxlan_find_mac(vxlan, mac, vni);
467 if (f)
468 f->used = jiffies;
469
470 return f;
471 }
472
473 /* caller should hold vxlan->hash_lock */
474 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
475 union vxlan_addr *ip, __be16 port,
476 __be32 vni, __u32 ifindex)
477 {
478 struct vxlan_rdst *rd;
479
480 list_for_each_entry(rd, &f->remotes, list) {
481 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
482 rd->remote_port == port &&
483 rd->remote_vni == vni &&
484 rd->remote_ifindex == ifindex)
485 return rd;
486 }
487
488 return NULL;
489 }
490
491 /* Replace destination of unicast mac */
492 static int vxlan_fdb_replace(struct vxlan_fdb *f,
493 union vxlan_addr *ip, __be16 port, __be32 vni,
494 __u32 ifindex)
495 {
496 struct vxlan_rdst *rd;
497
498 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
499 if (rd)
500 return 0;
501
502 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
503 if (!rd)
504 return 0;
505
506 dst_cache_reset(&rd->dst_cache);
507 rd->remote_ip = *ip;
508 rd->remote_port = port;
509 rd->remote_vni = vni;
510 rd->remote_ifindex = ifindex;
511 return 1;
512 }
513
514 /* Add/update destinations for multicast */
515 static int vxlan_fdb_append(struct vxlan_fdb *f,
516 union vxlan_addr *ip, __be16 port, __be32 vni,
517 __u32 ifindex, struct vxlan_rdst **rdp)
518 {
519 struct vxlan_rdst *rd;
520
521 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
522 if (rd)
523 return 0;
524
525 rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
526 if (rd == NULL)
527 return -ENOBUFS;
528
529 if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) {
530 kfree(rd);
531 return -ENOBUFS;
532 }
533
534 rd->remote_ip = *ip;
535 rd->remote_port = port;
536 rd->remote_vni = vni;
537 rd->remote_ifindex = ifindex;
538
539 list_add_tail_rcu(&rd->list, &f->remotes);
540
541 *rdp = rd;
542 return 1;
543 }
544
545 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
546 unsigned int off,
547 struct vxlanhdr *vh, size_t hdrlen,
548 __be32 vni_field,
549 struct gro_remcsum *grc,
550 bool nopartial)
551 {
552 size_t start, offset;
553
554 if (skb->remcsum_offload)
555 return vh;
556
557 if (!NAPI_GRO_CB(skb)->csum_valid)
558 return NULL;
559
560 start = vxlan_rco_start(vni_field);
561 offset = start + vxlan_rco_offset(vni_field);
562
563 vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
564 start, offset, grc, nopartial);
565
566 skb->remcsum_offload = 1;
567
568 return vh;
569 }
570
571 static struct sk_buff *vxlan_gro_receive(struct sock *sk,
572 struct list_head *head,
573 struct sk_buff *skb)
574 {
575 struct sk_buff *pp = NULL;
576 struct sk_buff *p;
577 struct vxlanhdr *vh, *vh2;
578 unsigned int hlen, off_vx;
579 int flush = 1;
580 struct vxlan_sock *vs = rcu_dereference_sk_user_data(sk);
581 __be32 flags;
582 struct gro_remcsum grc;
583
584 skb_gro_remcsum_init(&grc);
585
586 off_vx = skb_gro_offset(skb);
587 hlen = off_vx + sizeof(*vh);
588 vh = skb_gro_header_fast(skb, off_vx);
589 if (skb_gro_header_hard(skb, hlen)) {
590 vh = skb_gro_header_slow(skb, hlen, off_vx);
591 if (unlikely(!vh))
592 goto out;
593 }
594
595 skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
596
597 flags = vh->vx_flags;
598
599 if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
600 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
601 vh->vx_vni, &grc,
602 !!(vs->flags &
603 VXLAN_F_REMCSUM_NOPARTIAL));
604
605 if (!vh)
606 goto out;
607 }
608
609 skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
610
611 list_for_each_entry(p, head, list) {
612 if (!NAPI_GRO_CB(p)->same_flow)
613 continue;
614
615 vh2 = (struct vxlanhdr *)(p->data + off_vx);
616 if (vh->vx_flags != vh2->vx_flags ||
617 vh->vx_vni != vh2->vx_vni) {
618 NAPI_GRO_CB(p)->same_flow = 0;
619 continue;
620 }
621 }
622
623 pp = call_gro_receive(eth_gro_receive, head, skb);
624 flush = 0;
625
626 out:
627 skb_gro_flush_final_remcsum(skb, pp, flush, &grc);
628
629 return pp;
630 }
631
632 static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
633 {
634 /* Sets 'skb->inner_mac_header' since we are always called with
635 * 'skb->encapsulation' set.
636 */
637 return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
638 }
639
640 static struct vxlan_fdb *vxlan_fdb_alloc(struct vxlan_dev *vxlan,
641 const u8 *mac, __u16 state,
642 __be32 src_vni, __u8 ndm_flags)
643 {
644 struct vxlan_fdb *f;
645
646 f = kmalloc(sizeof(*f), GFP_ATOMIC);
647 if (!f)
648 return NULL;
649 f->state = state;
650 f->flags = ndm_flags;
651 f->updated = f->used = jiffies;
652 f->vni = src_vni;
653 INIT_LIST_HEAD(&f->remotes);
654 memcpy(f->eth_addr, mac, ETH_ALEN);
655
656 return f;
657 }
658
659 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
660 const u8 *mac, union vxlan_addr *ip,
661 __u16 state, __be16 port, __be32 src_vni,
662 __be32 vni, __u32 ifindex, __u8 ndm_flags,
663 struct vxlan_fdb **fdb)
664 {
665 struct vxlan_rdst *rd = NULL;
666 struct vxlan_fdb *f;
667 int rc;
668
669 if (vxlan->cfg.addrmax &&
670 vxlan->addrcnt >= vxlan->cfg.addrmax)
671 return -ENOSPC;
672
673 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
674 f = vxlan_fdb_alloc(vxlan, mac, state, src_vni, ndm_flags);
675 if (!f)
676 return -ENOMEM;
677
678 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
679 if (rc < 0) {
680 kfree(f);
681 return rc;
682 }
683
684 ++vxlan->addrcnt;
685 hlist_add_head_rcu(&f->hlist,
686 vxlan_fdb_head(vxlan, mac, src_vni));
687
688 *fdb = f;
689
690 return 0;
691 }
692
693 /* Add new entry to forwarding table -- assumes lock held */
694 static int vxlan_fdb_update(struct vxlan_dev *vxlan,
695 const u8 *mac, union vxlan_addr *ip,
696 __u16 state, __u16 flags,
697 __be16 port, __be32 src_vni, __be32 vni,
698 __u32 ifindex, __u8 ndm_flags)
699 {
700 struct vxlan_rdst *rd = NULL;
701 struct vxlan_fdb *f;
702 int notify = 0;
703 int rc;
704
705 f = __vxlan_find_mac(vxlan, mac, src_vni);
706 if (f) {
707 if (flags & NLM_F_EXCL) {
708 netdev_dbg(vxlan->dev,
709 "lost race to create %pM\n", mac);
710 return -EEXIST;
711 }
712 if (f->state != state) {
713 f->state = state;
714 f->updated = jiffies;
715 notify = 1;
716 }
717 if (f->flags != ndm_flags) {
718 f->flags = ndm_flags;
719 f->updated = jiffies;
720 notify = 1;
721 }
722 if ((flags & NLM_F_REPLACE)) {
723 /* Only change unicasts */
724 if (!(is_multicast_ether_addr(f->eth_addr) ||
725 is_zero_ether_addr(f->eth_addr))) {
726 notify |= vxlan_fdb_replace(f, ip, port, vni,
727 ifindex);
728 } else
729 return -EOPNOTSUPP;
730 }
731 if ((flags & NLM_F_APPEND) &&
732 (is_multicast_ether_addr(f->eth_addr) ||
733 is_zero_ether_addr(f->eth_addr))) {
734 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
735
736 if (rc < 0)
737 return rc;
738 notify |= rc;
739 }
740 } else {
741 if (!(flags & NLM_F_CREATE))
742 return -ENOENT;
743
744 /* Disallow replace to add a multicast entry */
745 if ((flags & NLM_F_REPLACE) &&
746 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
747 return -EOPNOTSUPP;
748
749 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
750 rc = vxlan_fdb_create(vxlan, mac, ip, state, port, src_vni,
751 vni, ifindex, ndm_flags, &f);
752 if (rc < 0)
753 return rc;
754 notify = 1;
755 }
756
757 if (notify) {
758 if (rd == NULL)
759 rd = first_remote_rtnl(f);
760 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
761 }
762
763 return 0;
764 }
765
766 static void vxlan_fdb_free(struct rcu_head *head)
767 {
768 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
769 struct vxlan_rdst *rd, *nd;
770
771 list_for_each_entry_safe(rd, nd, &f->remotes, list) {
772 dst_cache_destroy(&rd->dst_cache);
773 kfree(rd);
774 }
775 kfree(f);
776 }
777
778 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
779 bool do_notify)
780 {
781 netdev_dbg(vxlan->dev,
782 "delete %pM\n", f->eth_addr);
783
784 --vxlan->addrcnt;
785 if (do_notify)
786 vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
787
788 hlist_del_rcu(&f->hlist);
789 call_rcu(&f->rcu, vxlan_fdb_free);
790 }
791
792 static void vxlan_dst_free(struct rcu_head *head)
793 {
794 struct vxlan_rdst *rd = container_of(head, struct vxlan_rdst, rcu);
795
796 dst_cache_destroy(&rd->dst_cache);
797 kfree(rd);
798 }
799
800 static void vxlan_fdb_dst_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
801 struct vxlan_rdst *rd)
802 {
803 list_del_rcu(&rd->list);
804 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
805 call_rcu(&rd->rcu, vxlan_dst_free);
806 }
807
808 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
809 union vxlan_addr *ip, __be16 *port, __be32 *src_vni,
810 __be32 *vni, u32 *ifindex)
811 {
812 struct net *net = dev_net(vxlan->dev);
813 int err;
814
815 if (tb[NDA_DST]) {
816 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
817 if (err)
818 return err;
819 } else {
820 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
821 if (remote->sa.sa_family == AF_INET) {
822 ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
823 ip->sa.sa_family = AF_INET;
824 #if IS_ENABLED(CONFIG_IPV6)
825 } else {
826 ip->sin6.sin6_addr = in6addr_any;
827 ip->sa.sa_family = AF_INET6;
828 #endif
829 }
830 }
831
832 if (tb[NDA_PORT]) {
833 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
834 return -EINVAL;
835 *port = nla_get_be16(tb[NDA_PORT]);
836 } else {
837 *port = vxlan->cfg.dst_port;
838 }
839
840 if (tb[NDA_VNI]) {
841 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
842 return -EINVAL;
843 *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
844 } else {
845 *vni = vxlan->default_dst.remote_vni;
846 }
847
848 if (tb[NDA_SRC_VNI]) {
849 if (nla_len(tb[NDA_SRC_VNI]) != sizeof(u32))
850 return -EINVAL;
851 *src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI]));
852 } else {
853 *src_vni = vxlan->default_dst.remote_vni;
854 }
855
856 if (tb[NDA_IFINDEX]) {
857 struct net_device *tdev;
858
859 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
860 return -EINVAL;
861 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
862 tdev = __dev_get_by_index(net, *ifindex);
863 if (!tdev)
864 return -EADDRNOTAVAIL;
865 } else {
866 *ifindex = 0;
867 }
868
869 return 0;
870 }
871
872 /* Add static entry (via netlink) */
873 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
874 struct net_device *dev,
875 const unsigned char *addr, u16 vid, u16 flags)
876 {
877 struct vxlan_dev *vxlan = netdev_priv(dev);
878 /* struct net *net = dev_net(vxlan->dev); */
879 union vxlan_addr ip;
880 __be16 port;
881 __be32 src_vni, vni;
882 u32 ifindex;
883 int err;
884
885 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
886 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
887 ndm->ndm_state);
888 return -EINVAL;
889 }
890
891 if (tb[NDA_DST] == NULL)
892 return -EINVAL;
893
894 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex);
895 if (err)
896 return err;
897
898 if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
899 return -EAFNOSUPPORT;
900
901 spin_lock_bh(&vxlan->hash_lock);
902 err = vxlan_fdb_update(vxlan, addr, &ip, ndm->ndm_state, flags,
903 port, src_vni, vni, ifindex, ndm->ndm_flags);
904 spin_unlock_bh(&vxlan->hash_lock);
905
906 return err;
907 }
908
909 static int __vxlan_fdb_delete(struct vxlan_dev *vxlan,
910 const unsigned char *addr, union vxlan_addr ip,
911 __be16 port, __be32 src_vni, __be32 vni,
912 u32 ifindex, u16 vid)
913 {
914 struct vxlan_fdb *f;
915 struct vxlan_rdst *rd = NULL;
916 int err = -ENOENT;
917
918 f = vxlan_find_mac(vxlan, addr, src_vni);
919 if (!f)
920 return err;
921
922 if (!vxlan_addr_any(&ip)) {
923 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
924 if (!rd)
925 goto out;
926 }
927
928 /* remove a destination if it's not the only one on the list,
929 * otherwise destroy the fdb entry
930 */
931 if (rd && !list_is_singular(&f->remotes)) {
932 vxlan_fdb_dst_destroy(vxlan, f, rd);
933 goto out;
934 }
935
936 vxlan_fdb_destroy(vxlan, f, true);
937
938 out:
939 return 0;
940 }
941
942 /* Delete entry (via netlink) */
943 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
944 struct net_device *dev,
945 const unsigned char *addr, u16 vid)
946 {
947 struct vxlan_dev *vxlan = netdev_priv(dev);
948 union vxlan_addr ip;
949 __be32 src_vni, vni;
950 __be16 port;
951 u32 ifindex;
952 int err;
953
954 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex);
955 if (err)
956 return err;
957
958 spin_lock_bh(&vxlan->hash_lock);
959 err = __vxlan_fdb_delete(vxlan, addr, ip, port, src_vni, vni, ifindex,
960 vid);
961 spin_unlock_bh(&vxlan->hash_lock);
962
963 return err;
964 }
965
966 /* Dump forwarding table */
967 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
968 struct net_device *dev,
969 struct net_device *filter_dev, int *idx)
970 {
971 struct vxlan_dev *vxlan = netdev_priv(dev);
972 unsigned int h;
973 int err = 0;
974
975 for (h = 0; h < FDB_HASH_SIZE; ++h) {
976 struct vxlan_fdb *f;
977
978 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
979 struct vxlan_rdst *rd;
980
981 list_for_each_entry_rcu(rd, &f->remotes, list) {
982 if (*idx < cb->args[2])
983 goto skip;
984
985 err = vxlan_fdb_info(skb, vxlan, f,
986 NETLINK_CB(cb->skb).portid,
987 cb->nlh->nlmsg_seq,
988 RTM_NEWNEIGH,
989 NLM_F_MULTI, rd);
990 if (err < 0)
991 goto out;
992 skip:
993 *idx += 1;
994 }
995 }
996 }
997 out:
998 return err;
999 }
1000
1001 /* Watch incoming packets to learn mapping between Ethernet address
1002 * and Tunnel endpoint.
1003 * Return true if packet is bogus and should be dropped.
1004 */
1005 static bool vxlan_snoop(struct net_device *dev,
1006 union vxlan_addr *src_ip, const u8 *src_mac,
1007 u32 src_ifindex, __be32 vni)
1008 {
1009 struct vxlan_dev *vxlan = netdev_priv(dev);
1010 struct vxlan_fdb *f;
1011 u32 ifindex = 0;
1012
1013 #if IS_ENABLED(CONFIG_IPV6)
1014 if (src_ip->sa.sa_family == AF_INET6 &&
1015 (ipv6_addr_type(&src_ip->sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL))
1016 ifindex = src_ifindex;
1017 #endif
1018
1019 f = vxlan_find_mac(vxlan, src_mac, vni);
1020 if (likely(f)) {
1021 struct vxlan_rdst *rdst = first_remote_rcu(f);
1022
1023 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip) &&
1024 rdst->remote_ifindex == ifindex))
1025 return false;
1026
1027 /* Don't migrate static entries, drop packets */
1028 if (f->state & (NUD_PERMANENT | NUD_NOARP))
1029 return true;
1030
1031 if (net_ratelimit())
1032 netdev_info(dev,
1033 "%pM migrated from %pIS to %pIS\n",
1034 src_mac, &rdst->remote_ip.sa, &src_ip->sa);
1035
1036 rdst->remote_ip = *src_ip;
1037 f->updated = jiffies;
1038 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
1039 } else {
1040 /* learned new entry */
1041 spin_lock(&vxlan->hash_lock);
1042
1043 /* close off race between vxlan_flush and incoming packets */
1044 if (netif_running(dev))
1045 vxlan_fdb_update(vxlan, src_mac, src_ip,
1046 NUD_REACHABLE,
1047 NLM_F_EXCL|NLM_F_CREATE,
1048 vxlan->cfg.dst_port,
1049 vni,
1050 vxlan->default_dst.remote_vni,
1051 ifindex, NTF_SELF);
1052 spin_unlock(&vxlan->hash_lock);
1053 }
1054
1055 return false;
1056 }
1057
1058 /* See if multicast group is already in use by other ID */
1059 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
1060 {
1061 struct vxlan_dev *vxlan;
1062 struct vxlan_sock *sock4;
1063 #if IS_ENABLED(CONFIG_IPV6)
1064 struct vxlan_sock *sock6;
1065 #endif
1066 unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
1067
1068 sock4 = rtnl_dereference(dev->vn4_sock);
1069
1070 /* The vxlan_sock is only used by dev, leaving group has
1071 * no effect on other vxlan devices.
1072 */
1073 if (family == AF_INET && sock4 && refcount_read(&sock4->refcnt) == 1)
1074 return false;
1075 #if IS_ENABLED(CONFIG_IPV6)
1076 sock6 = rtnl_dereference(dev->vn6_sock);
1077 if (family == AF_INET6 && sock6 && refcount_read(&sock6->refcnt) == 1)
1078 return false;
1079 #endif
1080
1081 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1082 if (!netif_running(vxlan->dev) || vxlan == dev)
1083 continue;
1084
1085 if (family == AF_INET &&
1086 rtnl_dereference(vxlan->vn4_sock) != sock4)
1087 continue;
1088 #if IS_ENABLED(CONFIG_IPV6)
1089 if (family == AF_INET6 &&
1090 rtnl_dereference(vxlan->vn6_sock) != sock6)
1091 continue;
1092 #endif
1093
1094 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1095 &dev->default_dst.remote_ip))
1096 continue;
1097
1098 if (vxlan->default_dst.remote_ifindex !=
1099 dev->default_dst.remote_ifindex)
1100 continue;
1101
1102 return true;
1103 }
1104
1105 return false;
1106 }
1107
1108 static bool __vxlan_sock_release_prep(struct vxlan_sock *vs)
1109 {
1110 struct vxlan_net *vn;
1111
1112 if (!vs)
1113 return false;
1114 if (!refcount_dec_and_test(&vs->refcnt))
1115 return false;
1116
1117 vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1118 spin_lock(&vn->sock_lock);
1119 hlist_del_rcu(&vs->hlist);
1120 udp_tunnel_notify_del_rx_port(vs->sock,
1121 (vs->flags & VXLAN_F_GPE) ?
1122 UDP_TUNNEL_TYPE_VXLAN_GPE :
1123 UDP_TUNNEL_TYPE_VXLAN);
1124 spin_unlock(&vn->sock_lock);
1125
1126 return true;
1127 }
1128
1129 static void vxlan_sock_release(struct vxlan_dev *vxlan)
1130 {
1131 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1132 #if IS_ENABLED(CONFIG_IPV6)
1133 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1134
1135 RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
1136 #endif
1137
1138 RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
1139 synchronize_net();
1140
1141 vxlan_vs_del_dev(vxlan);
1142
1143 if (__vxlan_sock_release_prep(sock4)) {
1144 udp_tunnel_sock_release(sock4->sock);
1145 kfree(sock4);
1146 }
1147
1148 #if IS_ENABLED(CONFIG_IPV6)
1149 if (__vxlan_sock_release_prep(sock6)) {
1150 udp_tunnel_sock_release(sock6->sock);
1151 kfree(sock6);
1152 }
1153 #endif
1154 }
1155
1156 /* Update multicast group membership when first VNI on
1157 * multicast address is brought up
1158 */
1159 static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1160 {
1161 struct sock *sk;
1162 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1163 int ifindex = vxlan->default_dst.remote_ifindex;
1164 int ret = -EINVAL;
1165
1166 if (ip->sa.sa_family == AF_INET) {
1167 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1168 struct ip_mreqn mreq = {
1169 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1170 .imr_ifindex = ifindex,
1171 };
1172
1173 sk = sock4->sock->sk;
1174 lock_sock(sk);
1175 ret = ip_mc_join_group(sk, &mreq);
1176 release_sock(sk);
1177 #if IS_ENABLED(CONFIG_IPV6)
1178 } else {
1179 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1180
1181 sk = sock6->sock->sk;
1182 lock_sock(sk);
1183 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1184 &ip->sin6.sin6_addr);
1185 release_sock(sk);
1186 #endif
1187 }
1188
1189 return ret;
1190 }
1191
1192 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1193 static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1194 {
1195 struct sock *sk;
1196 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1197 int ifindex = vxlan->default_dst.remote_ifindex;
1198 int ret = -EINVAL;
1199
1200 if (ip->sa.sa_family == AF_INET) {
1201 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1202 struct ip_mreqn mreq = {
1203 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1204 .imr_ifindex = ifindex,
1205 };
1206
1207 sk = sock4->sock->sk;
1208 lock_sock(sk);
1209 ret = ip_mc_leave_group(sk, &mreq);
1210 release_sock(sk);
1211 #if IS_ENABLED(CONFIG_IPV6)
1212 } else {
1213 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1214
1215 sk = sock6->sock->sk;
1216 lock_sock(sk);
1217 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1218 &ip->sin6.sin6_addr);
1219 release_sock(sk);
1220 #endif
1221 }
1222
1223 return ret;
1224 }
1225
1226 static bool vxlan_remcsum(struct vxlanhdr *unparsed,
1227 struct sk_buff *skb, u32 vxflags)
1228 {
1229 size_t start, offset;
1230
1231 if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
1232 goto out;
1233
1234 start = vxlan_rco_start(unparsed->vx_vni);
1235 offset = start + vxlan_rco_offset(unparsed->vx_vni);
1236
1237 if (!pskb_may_pull(skb, offset + sizeof(u16)))
1238 return false;
1239
1240 skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
1241 !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL));
1242 out:
1243 unparsed->vx_flags &= ~VXLAN_HF_RCO;
1244 unparsed->vx_vni &= VXLAN_VNI_MASK;
1245 return true;
1246 }
1247
1248 static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
1249 struct sk_buff *skb, u32 vxflags,
1250 struct vxlan_metadata *md)
1251 {
1252 struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
1253 struct metadata_dst *tun_dst;
1254
1255 if (!(unparsed->vx_flags & VXLAN_HF_GBP))
1256 goto out;
1257
1258 md->gbp = ntohs(gbp->policy_id);
1259
1260 tun_dst = (struct metadata_dst *)skb_dst(skb);
1261 if (tun_dst) {
1262 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1263 tun_dst->u.tun_info.options_len = sizeof(*md);
1264 }
1265 if (gbp->dont_learn)
1266 md->gbp |= VXLAN_GBP_DONT_LEARN;
1267
1268 if (gbp->policy_applied)
1269 md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1270
1271 /* In flow-based mode, GBP is carried in dst_metadata */
1272 if (!(vxflags & VXLAN_F_COLLECT_METADATA))
1273 skb->mark = md->gbp;
1274 out:
1275 unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
1276 }
1277
1278 static bool vxlan_parse_gpe_hdr(struct vxlanhdr *unparsed,
1279 __be16 *protocol,
1280 struct sk_buff *skb, u32 vxflags)
1281 {
1282 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)unparsed;
1283
1284 /* Need to have Next Protocol set for interfaces in GPE mode. */
1285 if (!gpe->np_applied)
1286 return false;
1287 /* "The initial version is 0. If a receiver does not support the
1288 * version indicated it MUST drop the packet.
1289 */
1290 if (gpe->version != 0)
1291 return false;
1292 /* "When the O bit is set to 1, the packet is an OAM packet and OAM
1293 * processing MUST occur." However, we don't implement OAM
1294 * processing, thus drop the packet.
1295 */
1296 if (gpe->oam_flag)
1297 return false;
1298
1299 *protocol = tun_p_to_eth_p(gpe->next_protocol);
1300 if (!*protocol)
1301 return false;
1302
1303 unparsed->vx_flags &= ~VXLAN_GPE_USED_BITS;
1304 return true;
1305 }
1306
1307 static bool vxlan_set_mac(struct vxlan_dev *vxlan,
1308 struct vxlan_sock *vs,
1309 struct sk_buff *skb, __be32 vni)
1310 {
1311 union vxlan_addr saddr;
1312 u32 ifindex = skb->dev->ifindex;
1313
1314 skb_reset_mac_header(skb);
1315 skb->protocol = eth_type_trans(skb, vxlan->dev);
1316 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1317
1318 /* Ignore packet loops (and multicast echo) */
1319 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1320 return false;
1321
1322 /* Get address from the outer IP header */
1323 if (vxlan_get_sk_family(vs) == AF_INET) {
1324 saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
1325 saddr.sa.sa_family = AF_INET;
1326 #if IS_ENABLED(CONFIG_IPV6)
1327 } else {
1328 saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
1329 saddr.sa.sa_family = AF_INET6;
1330 #endif
1331 }
1332
1333 if ((vxlan->cfg.flags & VXLAN_F_LEARN) &&
1334 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source, ifindex, vni))
1335 return false;
1336
1337 return true;
1338 }
1339
1340 static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph,
1341 struct sk_buff *skb)
1342 {
1343 int err = 0;
1344
1345 if (vxlan_get_sk_family(vs) == AF_INET)
1346 err = IP_ECN_decapsulate(oiph, skb);
1347 #if IS_ENABLED(CONFIG_IPV6)
1348 else
1349 err = IP6_ECN_decapsulate(oiph, skb);
1350 #endif
1351
1352 if (unlikely(err) && log_ecn_error) {
1353 if (vxlan_get_sk_family(vs) == AF_INET)
1354 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1355 &((struct iphdr *)oiph)->saddr,
1356 ((struct iphdr *)oiph)->tos);
1357 else
1358 net_info_ratelimited("non-ECT from %pI6\n",
1359 &((struct ipv6hdr *)oiph)->saddr);
1360 }
1361 return err <= 1;
1362 }
1363
1364 /* Callback from net/ipv4/udp.c to receive packets */
1365 static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
1366 {
1367 struct pcpu_sw_netstats *stats;
1368 struct vxlan_dev *vxlan;
1369 struct vxlan_sock *vs;
1370 struct vxlanhdr unparsed;
1371 struct vxlan_metadata _md;
1372 struct vxlan_metadata *md = &_md;
1373 __be16 protocol = htons(ETH_P_TEB);
1374 bool raw_proto = false;
1375 void *oiph;
1376 __be32 vni = 0;
1377
1378 /* Need UDP and VXLAN header to be present */
1379 if (!pskb_may_pull(skb, VXLAN_HLEN))
1380 goto drop;
1381
1382 unparsed = *vxlan_hdr(skb);
1383 /* VNI flag always required to be set */
1384 if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
1385 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1386 ntohl(vxlan_hdr(skb)->vx_flags),
1387 ntohl(vxlan_hdr(skb)->vx_vni));
1388 /* Return non vxlan pkt */
1389 goto drop;
1390 }
1391 unparsed.vx_flags &= ~VXLAN_HF_VNI;
1392 unparsed.vx_vni &= ~VXLAN_VNI_MASK;
1393
1394 vs = rcu_dereference_sk_user_data(sk);
1395 if (!vs)
1396 goto drop;
1397
1398 vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
1399
1400 vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni);
1401 if (!vxlan)
1402 goto drop;
1403
1404 /* For backwards compatibility, only allow reserved fields to be
1405 * used by VXLAN extensions if explicitly requested.
1406 */
1407 if (vs->flags & VXLAN_F_GPE) {
1408 if (!vxlan_parse_gpe_hdr(&unparsed, &protocol, skb, vs->flags))
1409 goto drop;
1410 raw_proto = true;
1411 }
1412
1413 if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto,
1414 !net_eq(vxlan->net, dev_net(vxlan->dev))))
1415 goto drop;
1416
1417 if (vxlan_collect_metadata(vs)) {
1418 struct metadata_dst *tun_dst;
1419
1420 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1421 key32_to_tunnel_id(vni), sizeof(*md));
1422
1423 if (!tun_dst)
1424 goto drop;
1425
1426 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1427
1428 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1429 } else {
1430 memset(md, 0, sizeof(*md));
1431 }
1432
1433 if (vs->flags & VXLAN_F_REMCSUM_RX)
1434 if (!vxlan_remcsum(&unparsed, skb, vs->flags))
1435 goto drop;
1436 if (vs->flags & VXLAN_F_GBP)
1437 vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md);
1438 /* Note that GBP and GPE can never be active together. This is
1439 * ensured in vxlan_dev_configure.
1440 */
1441
1442 if (unparsed.vx_flags || unparsed.vx_vni) {
1443 /* If there are any unprocessed flags remaining treat
1444 * this as a malformed packet. This behavior diverges from
1445 * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1446 * in reserved fields are to be ignored. The approach here
1447 * maintains compatibility with previous stack code, and also
1448 * is more robust and provides a little more security in
1449 * adding extensions to VXLAN.
1450 */
1451 goto drop;
1452 }
1453
1454 if (!raw_proto) {
1455 if (!vxlan_set_mac(vxlan, vs, skb, vni))
1456 goto drop;
1457 } else {
1458 skb_reset_mac_header(skb);
1459 skb->dev = vxlan->dev;
1460 skb->pkt_type = PACKET_HOST;
1461 }
1462
1463 oiph = skb_network_header(skb);
1464 skb_reset_network_header(skb);
1465
1466 if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
1467 ++vxlan->dev->stats.rx_frame_errors;
1468 ++vxlan->dev->stats.rx_errors;
1469 goto drop;
1470 }
1471
1472 stats = this_cpu_ptr(vxlan->dev->tstats);
1473 u64_stats_update_begin(&stats->syncp);
1474 stats->rx_packets++;
1475 stats->rx_bytes += skb->len;
1476 u64_stats_update_end(&stats->syncp);
1477
1478 gro_cells_receive(&vxlan->gro_cells, skb);
1479 return 0;
1480
1481 drop:
1482 /* Consume bad packet */
1483 kfree_skb(skb);
1484 return 0;
1485 }
1486
1487 static int arp_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
1488 {
1489 struct vxlan_dev *vxlan = netdev_priv(dev);
1490 struct arphdr *parp;
1491 u8 *arpptr, *sha;
1492 __be32 sip, tip;
1493 struct neighbour *n;
1494
1495 if (dev->flags & IFF_NOARP)
1496 goto out;
1497
1498 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1499 dev->stats.tx_dropped++;
1500 goto out;
1501 }
1502 parp = arp_hdr(skb);
1503
1504 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1505 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1506 parp->ar_pro != htons(ETH_P_IP) ||
1507 parp->ar_op != htons(ARPOP_REQUEST) ||
1508 parp->ar_hln != dev->addr_len ||
1509 parp->ar_pln != 4)
1510 goto out;
1511 arpptr = (u8 *)parp + sizeof(struct arphdr);
1512 sha = arpptr;
1513 arpptr += dev->addr_len; /* sha */
1514 memcpy(&sip, arpptr, sizeof(sip));
1515 arpptr += sizeof(sip);
1516 arpptr += dev->addr_len; /* tha */
1517 memcpy(&tip, arpptr, sizeof(tip));
1518
1519 if (ipv4_is_loopback(tip) ||
1520 ipv4_is_multicast(tip))
1521 goto out;
1522
1523 n = neigh_lookup(&arp_tbl, &tip, dev);
1524
1525 if (n) {
1526 struct vxlan_fdb *f;
1527 struct sk_buff *reply;
1528
1529 if (!(n->nud_state & NUD_CONNECTED)) {
1530 neigh_release(n);
1531 goto out;
1532 }
1533
1534 f = vxlan_find_mac(vxlan, n->ha, vni);
1535 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1536 /* bridge-local neighbor */
1537 neigh_release(n);
1538 goto out;
1539 }
1540
1541 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1542 n->ha, sha);
1543
1544 neigh_release(n);
1545
1546 if (reply == NULL)
1547 goto out;
1548
1549 skb_reset_mac_header(reply);
1550 __skb_pull(reply, skb_network_offset(reply));
1551 reply->ip_summed = CHECKSUM_UNNECESSARY;
1552 reply->pkt_type = PACKET_HOST;
1553
1554 if (netif_rx_ni(reply) == NET_RX_DROP)
1555 dev->stats.rx_dropped++;
1556 } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
1557 union vxlan_addr ipa = {
1558 .sin.sin_addr.s_addr = tip,
1559 .sin.sin_family = AF_INET,
1560 };
1561
1562 vxlan_ip_miss(dev, &ipa);
1563 }
1564 out:
1565 consume_skb(skb);
1566 return NETDEV_TX_OK;
1567 }
1568
1569 #if IS_ENABLED(CONFIG_IPV6)
1570 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1571 struct neighbour *n, bool isrouter)
1572 {
1573 struct net_device *dev = request->dev;
1574 struct sk_buff *reply;
1575 struct nd_msg *ns, *na;
1576 struct ipv6hdr *pip6;
1577 u8 *daddr;
1578 int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1579 int ns_olen;
1580 int i, len;
1581
1582 if (dev == NULL || !pskb_may_pull(request, request->len))
1583 return NULL;
1584
1585 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1586 sizeof(*na) + na_olen + dev->needed_tailroom;
1587 reply = alloc_skb(len, GFP_ATOMIC);
1588 if (reply == NULL)
1589 return NULL;
1590
1591 reply->protocol = htons(ETH_P_IPV6);
1592 reply->dev = dev;
1593 skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1594 skb_push(reply, sizeof(struct ethhdr));
1595 skb_reset_mac_header(reply);
1596
1597 ns = (struct nd_msg *)(ipv6_hdr(request) + 1);
1598
1599 daddr = eth_hdr(request)->h_source;
1600 ns_olen = request->len - skb_network_offset(request) -
1601 sizeof(struct ipv6hdr) - sizeof(*ns);
1602 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1603 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1604 daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1605 break;
1606 }
1607 }
1608
1609 /* Ethernet header */
1610 ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1611 ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1612 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1613 reply->protocol = htons(ETH_P_IPV6);
1614
1615 skb_pull(reply, sizeof(struct ethhdr));
1616 skb_reset_network_header(reply);
1617 skb_put(reply, sizeof(struct ipv6hdr));
1618
1619 /* IPv6 header */
1620
1621 pip6 = ipv6_hdr(reply);
1622 memset(pip6, 0, sizeof(struct ipv6hdr));
1623 pip6->version = 6;
1624 pip6->priority = ipv6_hdr(request)->priority;
1625 pip6->nexthdr = IPPROTO_ICMPV6;
1626 pip6->hop_limit = 255;
1627 pip6->daddr = ipv6_hdr(request)->saddr;
1628 pip6->saddr = *(struct in6_addr *)n->primary_key;
1629
1630 skb_pull(reply, sizeof(struct ipv6hdr));
1631 skb_reset_transport_header(reply);
1632
1633 /* Neighbor Advertisement */
1634 na = skb_put_zero(reply, sizeof(*na) + na_olen);
1635 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1636 na->icmph.icmp6_router = isrouter;
1637 na->icmph.icmp6_override = 1;
1638 na->icmph.icmp6_solicited = 1;
1639 na->target = ns->target;
1640 ether_addr_copy(&na->opt[2], n->ha);
1641 na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1642 na->opt[1] = na_olen >> 3;
1643
1644 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1645 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1646 csum_partial(na, sizeof(*na)+na_olen, 0));
1647
1648 pip6->payload_len = htons(sizeof(*na)+na_olen);
1649
1650 skb_push(reply, sizeof(struct ipv6hdr));
1651
1652 reply->ip_summed = CHECKSUM_UNNECESSARY;
1653
1654 return reply;
1655 }
1656
1657 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
1658 {
1659 struct vxlan_dev *vxlan = netdev_priv(dev);
1660 const struct in6_addr *daddr;
1661 const struct ipv6hdr *iphdr;
1662 struct inet6_dev *in6_dev;
1663 struct neighbour *n;
1664 struct nd_msg *msg;
1665
1666 in6_dev = __in6_dev_get(dev);
1667 if (!in6_dev)
1668 goto out;
1669
1670 iphdr = ipv6_hdr(skb);
1671 daddr = &iphdr->daddr;
1672 msg = (struct nd_msg *)(iphdr + 1);
1673
1674 if (ipv6_addr_loopback(daddr) ||
1675 ipv6_addr_is_multicast(&msg->target))
1676 goto out;
1677
1678 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1679
1680 if (n) {
1681 struct vxlan_fdb *f;
1682 struct sk_buff *reply;
1683
1684 if (!(n->nud_state & NUD_CONNECTED)) {
1685 neigh_release(n);
1686 goto out;
1687 }
1688
1689 f = vxlan_find_mac(vxlan, n->ha, vni);
1690 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1691 /* bridge-local neighbor */
1692 neigh_release(n);
1693 goto out;
1694 }
1695
1696 reply = vxlan_na_create(skb, n,
1697 !!(f ? f->flags & NTF_ROUTER : 0));
1698
1699 neigh_release(n);
1700
1701 if (reply == NULL)
1702 goto out;
1703
1704 if (netif_rx_ni(reply) == NET_RX_DROP)
1705 dev->stats.rx_dropped++;
1706
1707 } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
1708 union vxlan_addr ipa = {
1709 .sin6.sin6_addr = msg->target,
1710 .sin6.sin6_family = AF_INET6,
1711 };
1712
1713 vxlan_ip_miss(dev, &ipa);
1714 }
1715
1716 out:
1717 consume_skb(skb);
1718 return NETDEV_TX_OK;
1719 }
1720 #endif
1721
1722 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1723 {
1724 struct vxlan_dev *vxlan = netdev_priv(dev);
1725 struct neighbour *n;
1726
1727 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1728 return false;
1729
1730 n = NULL;
1731 switch (ntohs(eth_hdr(skb)->h_proto)) {
1732 case ETH_P_IP:
1733 {
1734 struct iphdr *pip;
1735
1736 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1737 return false;
1738 pip = ip_hdr(skb);
1739 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1740 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
1741 union vxlan_addr ipa = {
1742 .sin.sin_addr.s_addr = pip->daddr,
1743 .sin.sin_family = AF_INET,
1744 };
1745
1746 vxlan_ip_miss(dev, &ipa);
1747 return false;
1748 }
1749
1750 break;
1751 }
1752 #if IS_ENABLED(CONFIG_IPV6)
1753 case ETH_P_IPV6:
1754 {
1755 struct ipv6hdr *pip6;
1756
1757 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1758 return false;
1759 pip6 = ipv6_hdr(skb);
1760 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1761 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
1762 union vxlan_addr ipa = {
1763 .sin6.sin6_addr = pip6->daddr,
1764 .sin6.sin6_family = AF_INET6,
1765 };
1766
1767 vxlan_ip_miss(dev, &ipa);
1768 return false;
1769 }
1770
1771 break;
1772 }
1773 #endif
1774 default:
1775 return false;
1776 }
1777
1778 if (n) {
1779 bool diff;
1780
1781 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1782 if (diff) {
1783 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1784 dev->addr_len);
1785 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1786 }
1787 neigh_release(n);
1788 return diff;
1789 }
1790
1791 return false;
1792 }
1793
1794 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
1795 struct vxlan_metadata *md)
1796 {
1797 struct vxlanhdr_gbp *gbp;
1798
1799 if (!md->gbp)
1800 return;
1801
1802 gbp = (struct vxlanhdr_gbp *)vxh;
1803 vxh->vx_flags |= VXLAN_HF_GBP;
1804
1805 if (md->gbp & VXLAN_GBP_DONT_LEARN)
1806 gbp->dont_learn = 1;
1807
1808 if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1809 gbp->policy_applied = 1;
1810
1811 gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1812 }
1813
1814 static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, u32 vxflags,
1815 __be16 protocol)
1816 {
1817 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh;
1818
1819 gpe->np_applied = 1;
1820 gpe->next_protocol = tun_p_from_eth_p(protocol);
1821 if (!gpe->next_protocol)
1822 return -EPFNOSUPPORT;
1823 return 0;
1824 }
1825
1826 static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
1827 int iphdr_len, __be32 vni,
1828 struct vxlan_metadata *md, u32 vxflags,
1829 bool udp_sum)
1830 {
1831 struct vxlanhdr *vxh;
1832 int min_headroom;
1833 int err;
1834 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1835 __be16 inner_protocol = htons(ETH_P_TEB);
1836
1837 if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1838 skb->ip_summed == CHECKSUM_PARTIAL) {
1839 int csum_start = skb_checksum_start_offset(skb);
1840
1841 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1842 !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1843 (skb->csum_offset == offsetof(struct udphdr, check) ||
1844 skb->csum_offset == offsetof(struct tcphdr, check)))
1845 type |= SKB_GSO_TUNNEL_REMCSUM;
1846 }
1847
1848 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1849 + VXLAN_HLEN + iphdr_len;
1850
1851 /* Need space for new headers (invalidates iph ptr) */
1852 err = skb_cow_head(skb, min_headroom);
1853 if (unlikely(err))
1854 return err;
1855
1856 err = iptunnel_handle_offloads(skb, type);
1857 if (err)
1858 return err;
1859
1860 vxh = __skb_push(skb, sizeof(*vxh));
1861 vxh->vx_flags = VXLAN_HF_VNI;
1862 vxh->vx_vni = vxlan_vni_field(vni);
1863
1864 if (type & SKB_GSO_TUNNEL_REMCSUM) {
1865 unsigned int start;
1866
1867 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
1868 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
1869 vxh->vx_flags |= VXLAN_HF_RCO;
1870
1871 if (!skb_is_gso(skb)) {
1872 skb->ip_summed = CHECKSUM_NONE;
1873 skb->encapsulation = 0;
1874 }
1875 }
1876
1877 if (vxflags & VXLAN_F_GBP)
1878 vxlan_build_gbp_hdr(vxh, vxflags, md);
1879 if (vxflags & VXLAN_F_GPE) {
1880 err = vxlan_build_gpe_hdr(vxh, vxflags, skb->protocol);
1881 if (err < 0)
1882 return err;
1883 inner_protocol = skb->protocol;
1884 }
1885
1886 skb_set_inner_protocol(skb, inner_protocol);
1887 return 0;
1888 }
1889
1890 static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan, struct net_device *dev,
1891 struct vxlan_sock *sock4,
1892 struct sk_buff *skb, int oif, u8 tos,
1893 __be32 daddr, __be32 *saddr, __be16 dport, __be16 sport,
1894 struct dst_cache *dst_cache,
1895 const struct ip_tunnel_info *info)
1896 {
1897 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
1898 struct rtable *rt = NULL;
1899 struct flowi4 fl4;
1900
1901 if (!sock4)
1902 return ERR_PTR(-EIO);
1903
1904 if (tos && !info)
1905 use_cache = false;
1906 if (use_cache) {
1907 rt = dst_cache_get_ip4(dst_cache, saddr);
1908 if (rt)
1909 return rt;
1910 }
1911
1912 memset(&fl4, 0, sizeof(fl4));
1913 fl4.flowi4_oif = oif;
1914 fl4.flowi4_tos = RT_TOS(tos);
1915 fl4.flowi4_mark = skb->mark;
1916 fl4.flowi4_proto = IPPROTO_UDP;
1917 fl4.daddr = daddr;
1918 fl4.saddr = *saddr;
1919 fl4.fl4_dport = dport;
1920 fl4.fl4_sport = sport;
1921
1922 rt = ip_route_output_key(vxlan->net, &fl4);
1923 if (likely(!IS_ERR(rt))) {
1924 if (rt->dst.dev == dev) {
1925 netdev_dbg(dev, "circular route to %pI4\n", &daddr);
1926 ip_rt_put(rt);
1927 return ERR_PTR(-ELOOP);
1928 }
1929
1930 *saddr = fl4.saddr;
1931 if (use_cache)
1932 dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
1933 } else {
1934 netdev_dbg(dev, "no route to %pI4\n", &daddr);
1935 return ERR_PTR(-ENETUNREACH);
1936 }
1937 return rt;
1938 }
1939
1940 #if IS_ENABLED(CONFIG_IPV6)
1941 static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
1942 struct net_device *dev,
1943 struct vxlan_sock *sock6,
1944 struct sk_buff *skb, int oif, u8 tos,
1945 __be32 label,
1946 const struct in6_addr *daddr,
1947 struct in6_addr *saddr,
1948 __be16 dport, __be16 sport,
1949 struct dst_cache *dst_cache,
1950 const struct ip_tunnel_info *info)
1951 {
1952 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
1953 struct dst_entry *ndst;
1954 struct flowi6 fl6;
1955 int err;
1956
1957 if (!sock6)
1958 return ERR_PTR(-EIO);
1959
1960 if (tos && !info)
1961 use_cache = false;
1962 if (use_cache) {
1963 ndst = dst_cache_get_ip6(dst_cache, saddr);
1964 if (ndst)
1965 return ndst;
1966 }
1967
1968 memset(&fl6, 0, sizeof(fl6));
1969 fl6.flowi6_oif = oif;
1970 fl6.daddr = *daddr;
1971 fl6.saddr = *saddr;
1972 fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tos), label);
1973 fl6.flowi6_mark = skb->mark;
1974 fl6.flowi6_proto = IPPROTO_UDP;
1975 fl6.fl6_dport = dport;
1976 fl6.fl6_sport = sport;
1977
1978 err = ipv6_stub->ipv6_dst_lookup(vxlan->net,
1979 sock6->sock->sk,
1980 &ndst, &fl6);
1981 if (unlikely(err < 0)) {
1982 netdev_dbg(dev, "no route to %pI6\n", daddr);
1983 return ERR_PTR(-ENETUNREACH);
1984 }
1985
1986 if (unlikely(ndst->dev == dev)) {
1987 netdev_dbg(dev, "circular route to %pI6\n", daddr);
1988 dst_release(ndst);
1989 return ERR_PTR(-ELOOP);
1990 }
1991
1992 *saddr = fl6.saddr;
1993 if (use_cache)
1994 dst_cache_set_ip6(dst_cache, ndst, saddr);
1995 return ndst;
1996 }
1997 #endif
1998
1999 /* Bypass encapsulation if the destination is local */
2000 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
2001 struct vxlan_dev *dst_vxlan, __be32 vni)
2002 {
2003 struct pcpu_sw_netstats *tx_stats, *rx_stats;
2004 union vxlan_addr loopback;
2005 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
2006 struct net_device *dev = skb->dev;
2007 int len = skb->len;
2008
2009 tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
2010 rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
2011 skb->pkt_type = PACKET_HOST;
2012 skb->encapsulation = 0;
2013 skb->dev = dst_vxlan->dev;
2014 __skb_pull(skb, skb_network_offset(skb));
2015
2016 if (remote_ip->sa.sa_family == AF_INET) {
2017 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
2018 loopback.sa.sa_family = AF_INET;
2019 #if IS_ENABLED(CONFIG_IPV6)
2020 } else {
2021 loopback.sin6.sin6_addr = in6addr_loopback;
2022 loopback.sa.sa_family = AF_INET6;
2023 #endif
2024 }
2025
2026 if (dst_vxlan->cfg.flags & VXLAN_F_LEARN)
2027 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source, 0,
2028 vni);
2029
2030 u64_stats_update_begin(&tx_stats->syncp);
2031 tx_stats->tx_packets++;
2032 tx_stats->tx_bytes += len;
2033 u64_stats_update_end(&tx_stats->syncp);
2034
2035 if (netif_rx(skb) == NET_RX_SUCCESS) {
2036 u64_stats_update_begin(&rx_stats->syncp);
2037 rx_stats->rx_packets++;
2038 rx_stats->rx_bytes += len;
2039 u64_stats_update_end(&rx_stats->syncp);
2040 } else {
2041 dev->stats.rx_dropped++;
2042 }
2043 }
2044
2045 static int encap_bypass_if_local(struct sk_buff *skb, struct net_device *dev,
2046 struct vxlan_dev *vxlan,
2047 union vxlan_addr *daddr,
2048 __be16 dst_port, int dst_ifindex, __be32 vni,
2049 struct dst_entry *dst,
2050 u32 rt_flags)
2051 {
2052 #if IS_ENABLED(CONFIG_IPV6)
2053 /* IPv6 rt-flags are checked against RTF_LOCAL, but the value of
2054 * RTF_LOCAL is equal to RTCF_LOCAL. So to keep code simple
2055 * we can use RTCF_LOCAL which works for ipv4 and ipv6 route entry.
2056 */
2057 BUILD_BUG_ON(RTCF_LOCAL != RTF_LOCAL);
2058 #endif
2059 /* Bypass encapsulation if the destination is local */
2060 if (rt_flags & RTCF_LOCAL &&
2061 !(rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2062 struct vxlan_dev *dst_vxlan;
2063
2064 dst_release(dst);
2065 dst_vxlan = vxlan_find_vni(vxlan->net, dst_ifindex, vni,
2066 daddr->sa.sa_family, dst_port,
2067 vxlan->cfg.flags);
2068 if (!dst_vxlan) {
2069 dev->stats.tx_errors++;
2070 kfree_skb(skb);
2071
2072 return -ENOENT;
2073 }
2074 vxlan_encap_bypass(skb, vxlan, dst_vxlan, vni);
2075 return 1;
2076 }
2077
2078 return 0;
2079 }
2080
2081 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
2082 __be32 default_vni, struct vxlan_rdst *rdst,
2083 bool did_rsc)
2084 {
2085 struct dst_cache *dst_cache;
2086 struct ip_tunnel_info *info;
2087 struct vxlan_dev *vxlan = netdev_priv(dev);
2088 const struct iphdr *old_iph = ip_hdr(skb);
2089 union vxlan_addr *dst;
2090 union vxlan_addr remote_ip, local_ip;
2091 struct vxlan_metadata _md;
2092 struct vxlan_metadata *md = &_md;
2093 __be16 src_port = 0, dst_port;
2094 struct dst_entry *ndst = NULL;
2095 __be32 vni, label;
2096 __u8 tos, ttl;
2097 int ifindex;
2098 int err;
2099 u32 flags = vxlan->cfg.flags;
2100 bool udp_sum = false;
2101 bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
2102
2103 info = skb_tunnel_info(skb);
2104
2105 if (rdst) {
2106 dst = &rdst->remote_ip;
2107 if (vxlan_addr_any(dst)) {
2108 if (did_rsc) {
2109 /* short-circuited back to local bridge */
2110 vxlan_encap_bypass(skb, vxlan, vxlan, default_vni);
2111 return;
2112 }
2113 goto drop;
2114 }
2115
2116 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
2117 vni = (rdst->remote_vni) ? : default_vni;
2118 ifindex = rdst->remote_ifindex;
2119 local_ip = vxlan->cfg.saddr;
2120 dst_cache = &rdst->dst_cache;
2121 md->gbp = skb->mark;
2122 if (flags & VXLAN_F_TTL_INHERIT) {
2123 ttl = ip_tunnel_get_ttl(old_iph, skb);
2124 } else {
2125 ttl = vxlan->cfg.ttl;
2126 if (!ttl && vxlan_addr_multicast(dst))
2127 ttl = 1;
2128 }
2129
2130 tos = vxlan->cfg.tos;
2131 if (tos == 1)
2132 tos = ip_tunnel_get_dsfield(old_iph, skb);
2133
2134 if (dst->sa.sa_family == AF_INET)
2135 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
2136 else
2137 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2138 label = vxlan->cfg.label;
2139 } else {
2140 if (!info) {
2141 WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
2142 dev->name);
2143 goto drop;
2144 }
2145 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
2146 if (remote_ip.sa.sa_family == AF_INET) {
2147 remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
2148 local_ip.sin.sin_addr.s_addr = info->key.u.ipv4.src;
2149 } else {
2150 remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
2151 local_ip.sin6.sin6_addr = info->key.u.ipv6.src;
2152 }
2153 dst = &remote_ip;
2154 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
2155 vni = tunnel_id_to_key32(info->key.tun_id);
2156 ifindex = 0;
2157 dst_cache = &info->dst_cache;
2158 if (info->options_len &&
2159 info->key.tun_flags & TUNNEL_VXLAN_OPT)
2160 md = ip_tunnel_info_opts(info);
2161 ttl = info->key.ttl;
2162 tos = info->key.tos;
2163 label = info->key.label;
2164 udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
2165 }
2166 src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2167 vxlan->cfg.port_max, true);
2168
2169 rcu_read_lock();
2170 if (dst->sa.sa_family == AF_INET) {
2171 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
2172 struct rtable *rt;
2173 __be16 df = 0;
2174
2175 rt = vxlan_get_route(vxlan, dev, sock4, skb, ifindex, tos,
2176 dst->sin.sin_addr.s_addr,
2177 &local_ip.sin.sin_addr.s_addr,
2178 dst_port, src_port,
2179 dst_cache, info);
2180 if (IS_ERR(rt)) {
2181 err = PTR_ERR(rt);
2182 goto tx_error;
2183 }
2184
2185 /* Bypass encapsulation if the destination is local */
2186 if (!info) {
2187 err = encap_bypass_if_local(skb, dev, vxlan, dst,
2188 dst_port, ifindex, vni,
2189 &rt->dst, rt->rt_flags);
2190 if (err)
2191 goto out_unlock;
2192 } else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT) {
2193 df = htons(IP_DF);
2194 }
2195
2196 ndst = &rt->dst;
2197 if (skb_dst(skb)) {
2198 int mtu = dst_mtu(ndst) - VXLAN_HEADROOM;
2199
2200 skb_dst_update_pmtu(skb, mtu);
2201 }
2202
2203 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2204 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2205 err = vxlan_build_skb(skb, ndst, sizeof(struct iphdr),
2206 vni, md, flags, udp_sum);
2207 if (err < 0)
2208 goto tx_error;
2209
2210 udp_tunnel_xmit_skb(rt, sock4->sock->sk, skb, local_ip.sin.sin_addr.s_addr,
2211 dst->sin.sin_addr.s_addr, tos, ttl, df,
2212 src_port, dst_port, xnet, !udp_sum);
2213 #if IS_ENABLED(CONFIG_IPV6)
2214 } else {
2215 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
2216
2217 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, ifindex, tos,
2218 label, &dst->sin6.sin6_addr,
2219 &local_ip.sin6.sin6_addr,
2220 dst_port, src_port,
2221 dst_cache, info);
2222 if (IS_ERR(ndst)) {
2223 err = PTR_ERR(ndst);
2224 ndst = NULL;
2225 goto tx_error;
2226 }
2227
2228 if (!info) {
2229 u32 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2230
2231 err = encap_bypass_if_local(skb, dev, vxlan, dst,
2232 dst_port, ifindex, vni,
2233 ndst, rt6i_flags);
2234 if (err)
2235 goto out_unlock;
2236 }
2237
2238 if (skb_dst(skb)) {
2239 int mtu = dst_mtu(ndst) - VXLAN6_HEADROOM;
2240
2241 skb_dst_update_pmtu(skb, mtu);
2242 }
2243
2244 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2245 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2246 skb_scrub_packet(skb, xnet);
2247 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
2248 vni, md, flags, udp_sum);
2249 if (err < 0)
2250 goto tx_error;
2251
2252 udp_tunnel6_xmit_skb(ndst, sock6->sock->sk, skb, dev,
2253 &local_ip.sin6.sin6_addr,
2254 &dst->sin6.sin6_addr, tos, ttl,
2255 label, src_port, dst_port, !udp_sum);
2256 #endif
2257 }
2258 out_unlock:
2259 rcu_read_unlock();
2260 return;
2261
2262 drop:
2263 dev->stats.tx_dropped++;
2264 dev_kfree_skb(skb);
2265 return;
2266
2267 tx_error:
2268 rcu_read_unlock();
2269 if (err == -ELOOP)
2270 dev->stats.collisions++;
2271 else if (err == -ENETUNREACH)
2272 dev->stats.tx_carrier_errors++;
2273 dst_release(ndst);
2274 dev->stats.tx_errors++;
2275 kfree_skb(skb);
2276 }
2277
2278 /* Transmit local packets over Vxlan
2279 *
2280 * Outer IP header inherits ECN and DF from inner header.
2281 * Outer UDP destination is the VXLAN assigned port.
2282 * source port is based on hash of flow
2283 */
2284 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2285 {
2286 struct vxlan_dev *vxlan = netdev_priv(dev);
2287 struct vxlan_rdst *rdst, *fdst = NULL;
2288 const struct ip_tunnel_info *info;
2289 bool did_rsc = false;
2290 struct vxlan_fdb *f;
2291 struct ethhdr *eth;
2292 __be32 vni = 0;
2293
2294 info = skb_tunnel_info(skb);
2295
2296 skb_reset_mac_header(skb);
2297
2298 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
2299 if (info && info->mode & IP_TUNNEL_INFO_BRIDGE &&
2300 info->mode & IP_TUNNEL_INFO_TX) {
2301 vni = tunnel_id_to_key32(info->key.tun_id);
2302 } else {
2303 if (info && info->mode & IP_TUNNEL_INFO_TX)
2304 vxlan_xmit_one(skb, dev, vni, NULL, false);
2305 else
2306 kfree_skb(skb);
2307 return NETDEV_TX_OK;
2308 }
2309 }
2310
2311 if (vxlan->cfg.flags & VXLAN_F_PROXY) {
2312 eth = eth_hdr(skb);
2313 if (ntohs(eth->h_proto) == ETH_P_ARP)
2314 return arp_reduce(dev, skb, vni);
2315 #if IS_ENABLED(CONFIG_IPV6)
2316 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2317 pskb_may_pull(skb, sizeof(struct ipv6hdr) +
2318 sizeof(struct nd_msg)) &&
2319 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2320 struct nd_msg *m = (struct nd_msg *)(ipv6_hdr(skb) + 1);
2321
2322 if (m->icmph.icmp6_code == 0 &&
2323 m->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2324 return neigh_reduce(dev, skb, vni);
2325 }
2326 #endif
2327 }
2328
2329 eth = eth_hdr(skb);
2330 f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2331 did_rsc = false;
2332
2333 if (f && (f->flags & NTF_ROUTER) && (vxlan->cfg.flags & VXLAN_F_RSC) &&
2334 (ntohs(eth->h_proto) == ETH_P_IP ||
2335 ntohs(eth->h_proto) == ETH_P_IPV6)) {
2336 did_rsc = route_shortcircuit(dev, skb);
2337 if (did_rsc)
2338 f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2339 }
2340
2341 if (f == NULL) {
2342 f = vxlan_find_mac(vxlan, all_zeros_mac, vni);
2343 if (f == NULL) {
2344 if ((vxlan->cfg.flags & VXLAN_F_L2MISS) &&
2345 !is_multicast_ether_addr(eth->h_dest))
2346 vxlan_fdb_miss(vxlan, eth->h_dest);
2347
2348 dev->stats.tx_dropped++;
2349 kfree_skb(skb);
2350 return NETDEV_TX_OK;
2351 }
2352 }
2353
2354 list_for_each_entry_rcu(rdst, &f->remotes, list) {
2355 struct sk_buff *skb1;
2356
2357 if (!fdst) {
2358 fdst = rdst;
2359 continue;
2360 }
2361 skb1 = skb_clone(skb, GFP_ATOMIC);
2362 if (skb1)
2363 vxlan_xmit_one(skb1, dev, vni, rdst, did_rsc);
2364 }
2365
2366 if (fdst)
2367 vxlan_xmit_one(skb, dev, vni, fdst, did_rsc);
2368 else
2369 kfree_skb(skb);
2370 return NETDEV_TX_OK;
2371 }
2372
2373 /* Walk the forwarding table and purge stale entries */
2374 static void vxlan_cleanup(struct timer_list *t)
2375 {
2376 struct vxlan_dev *vxlan = from_timer(vxlan, t, age_timer);
2377 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2378 unsigned int h;
2379
2380 if (!netif_running(vxlan->dev))
2381 return;
2382
2383 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2384 struct hlist_node *p, *n;
2385
2386 spin_lock_bh(&vxlan->hash_lock);
2387 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2388 struct vxlan_fdb *f
2389 = container_of(p, struct vxlan_fdb, hlist);
2390 unsigned long timeout;
2391
2392 if (f->state & (NUD_PERMANENT | NUD_NOARP))
2393 continue;
2394
2395 if (f->flags & NTF_EXT_LEARNED)
2396 continue;
2397
2398 timeout = f->used + vxlan->cfg.age_interval * HZ;
2399 if (time_before_eq(timeout, jiffies)) {
2400 netdev_dbg(vxlan->dev,
2401 "garbage collect %pM\n",
2402 f->eth_addr);
2403 f->state = NUD_STALE;
2404 vxlan_fdb_destroy(vxlan, f, true);
2405 } else if (time_before(timeout, next_timer))
2406 next_timer = timeout;
2407 }
2408 spin_unlock_bh(&vxlan->hash_lock);
2409 }
2410
2411 mod_timer(&vxlan->age_timer, next_timer);
2412 }
2413
2414 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan)
2415 {
2416 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2417
2418 spin_lock(&vn->sock_lock);
2419 hlist_del_init_rcu(&vxlan->hlist4.hlist);
2420 #if IS_ENABLED(CONFIG_IPV6)
2421 hlist_del_init_rcu(&vxlan->hlist6.hlist);
2422 #endif
2423 spin_unlock(&vn->sock_lock);
2424 }
2425
2426 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan,
2427 struct vxlan_dev_node *node)
2428 {
2429 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2430 __be32 vni = vxlan->default_dst.remote_vni;
2431
2432 node->vxlan = vxlan;
2433 spin_lock(&vn->sock_lock);
2434 hlist_add_head_rcu(&node->hlist, vni_head(vs, vni));
2435 spin_unlock(&vn->sock_lock);
2436 }
2437
2438 /* Setup stats when device is created */
2439 static int vxlan_init(struct net_device *dev)
2440 {
2441 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2442 if (!dev->tstats)
2443 return -ENOMEM;
2444
2445 return 0;
2446 }
2447
2448 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan, __be32 vni)
2449 {
2450 struct vxlan_fdb *f;
2451
2452 spin_lock_bh(&vxlan->hash_lock);
2453 f = __vxlan_find_mac(vxlan, all_zeros_mac, vni);
2454 if (f)
2455 vxlan_fdb_destroy(vxlan, f, true);
2456 spin_unlock_bh(&vxlan->hash_lock);
2457 }
2458
2459 static void vxlan_uninit(struct net_device *dev)
2460 {
2461 struct vxlan_dev *vxlan = netdev_priv(dev);
2462
2463 vxlan_fdb_delete_default(vxlan, vxlan->cfg.vni);
2464
2465 free_percpu(dev->tstats);
2466 }
2467
2468 /* Start ageing timer and join group when device is brought up */
2469 static int vxlan_open(struct net_device *dev)
2470 {
2471 struct vxlan_dev *vxlan = netdev_priv(dev);
2472 int ret;
2473
2474 ret = vxlan_sock_add(vxlan);
2475 if (ret < 0)
2476 return ret;
2477
2478 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2479 ret = vxlan_igmp_join(vxlan);
2480 if (ret == -EADDRINUSE)
2481 ret = 0;
2482 if (ret) {
2483 vxlan_sock_release(vxlan);
2484 return ret;
2485 }
2486 }
2487
2488 if (vxlan->cfg.age_interval)
2489 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2490
2491 return ret;
2492 }
2493
2494 /* Purge the forwarding table */
2495 static void vxlan_flush(struct vxlan_dev *vxlan, bool do_all)
2496 {
2497 unsigned int h;
2498
2499 spin_lock_bh(&vxlan->hash_lock);
2500 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2501 struct hlist_node *p, *n;
2502 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2503 struct vxlan_fdb *f
2504 = container_of(p, struct vxlan_fdb, hlist);
2505 if (!do_all && (f->state & (NUD_PERMANENT | NUD_NOARP)))
2506 continue;
2507 /* the all_zeros_mac entry is deleted at vxlan_uninit */
2508 if (!is_zero_ether_addr(f->eth_addr))
2509 vxlan_fdb_destroy(vxlan, f, true);
2510 }
2511 }
2512 spin_unlock_bh(&vxlan->hash_lock);
2513 }
2514
2515 /* Cleanup timer and forwarding table on shutdown */
2516 static int vxlan_stop(struct net_device *dev)
2517 {
2518 struct vxlan_dev *vxlan = netdev_priv(dev);
2519 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2520 int ret = 0;
2521
2522 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2523 !vxlan_group_used(vn, vxlan))
2524 ret = vxlan_igmp_leave(vxlan);
2525
2526 del_timer_sync(&vxlan->age_timer);
2527
2528 vxlan_flush(vxlan, false);
2529 vxlan_sock_release(vxlan);
2530
2531 return ret;
2532 }
2533
2534 /* Stub, nothing needs to be done. */
2535 static void vxlan_set_multicast_list(struct net_device *dev)
2536 {
2537 }
2538
2539 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2540 {
2541 struct vxlan_dev *vxlan = netdev_priv(dev);
2542 struct vxlan_rdst *dst = &vxlan->default_dst;
2543 struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
2544 dst->remote_ifindex);
2545 bool use_ipv6 = !!(vxlan->cfg.flags & VXLAN_F_IPV6);
2546
2547 /* This check is different than dev->max_mtu, because it looks at
2548 * the lowerdev->mtu, rather than the static dev->max_mtu
2549 */
2550 if (lowerdev) {
2551 int max_mtu = lowerdev->mtu -
2552 (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2553 if (new_mtu > max_mtu)
2554 return -EINVAL;
2555 }
2556
2557 dev->mtu = new_mtu;
2558 return 0;
2559 }
2560
2561 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
2562 {
2563 struct vxlan_dev *vxlan = netdev_priv(dev);
2564 struct ip_tunnel_info *info = skb_tunnel_info(skb);
2565 __be16 sport, dport;
2566
2567 sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2568 vxlan->cfg.port_max, true);
2569 dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
2570
2571 if (ip_tunnel_info_af(info) == AF_INET) {
2572 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
2573 struct rtable *rt;
2574
2575 rt = vxlan_get_route(vxlan, dev, sock4, skb, 0, info->key.tos,
2576 info->key.u.ipv4.dst,
2577 &info->key.u.ipv4.src, dport, sport,
2578 &info->dst_cache, info);
2579 if (IS_ERR(rt))
2580 return PTR_ERR(rt);
2581 ip_rt_put(rt);
2582 } else {
2583 #if IS_ENABLED(CONFIG_IPV6)
2584 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
2585 struct dst_entry *ndst;
2586
2587 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, 0, info->key.tos,
2588 info->key.label, &info->key.u.ipv6.dst,
2589 &info->key.u.ipv6.src, dport, sport,
2590 &info->dst_cache, info);
2591 if (IS_ERR(ndst))
2592 return PTR_ERR(ndst);
2593 dst_release(ndst);
2594 #else /* !CONFIG_IPV6 */
2595 return -EPFNOSUPPORT;
2596 #endif
2597 }
2598 info->key.tp_src = sport;
2599 info->key.tp_dst = dport;
2600 return 0;
2601 }
2602
2603 static const struct net_device_ops vxlan_netdev_ether_ops = {
2604 .ndo_init = vxlan_init,
2605 .ndo_uninit = vxlan_uninit,
2606 .ndo_open = vxlan_open,
2607 .ndo_stop = vxlan_stop,
2608 .ndo_start_xmit = vxlan_xmit,
2609 .ndo_get_stats64 = ip_tunnel_get_stats64,
2610 .ndo_set_rx_mode = vxlan_set_multicast_list,
2611 .ndo_change_mtu = vxlan_change_mtu,
2612 .ndo_validate_addr = eth_validate_addr,
2613 .ndo_set_mac_address = eth_mac_addr,
2614 .ndo_fdb_add = vxlan_fdb_add,
2615 .ndo_fdb_del = vxlan_fdb_delete,
2616 .ndo_fdb_dump = vxlan_fdb_dump,
2617 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
2618 };
2619
2620 static const struct net_device_ops vxlan_netdev_raw_ops = {
2621 .ndo_init = vxlan_init,
2622 .ndo_uninit = vxlan_uninit,
2623 .ndo_open = vxlan_open,
2624 .ndo_stop = vxlan_stop,
2625 .ndo_start_xmit = vxlan_xmit,
2626 .ndo_get_stats64 = ip_tunnel_get_stats64,
2627 .ndo_change_mtu = vxlan_change_mtu,
2628 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
2629 };
2630
2631 /* Info for udev, that this is a virtual tunnel endpoint */
2632 static struct device_type vxlan_type = {
2633 .name = "vxlan",
2634 };
2635
2636 /* Calls the ndo_udp_tunnel_add of the caller in order to
2637 * supply the listening VXLAN udp ports. Callers are expected
2638 * to implement the ndo_udp_tunnel_add.
2639 */
2640 static void vxlan_offload_rx_ports(struct net_device *dev, bool push)
2641 {
2642 struct vxlan_sock *vs;
2643 struct net *net = dev_net(dev);
2644 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2645 unsigned int i;
2646
2647 spin_lock(&vn->sock_lock);
2648 for (i = 0; i < PORT_HASH_SIZE; ++i) {
2649 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2650 unsigned short type;
2651
2652 if (vs->flags & VXLAN_F_GPE)
2653 type = UDP_TUNNEL_TYPE_VXLAN_GPE;
2654 else
2655 type = UDP_TUNNEL_TYPE_VXLAN;
2656
2657 if (push)
2658 udp_tunnel_push_rx_port(dev, vs->sock, type);
2659 else
2660 udp_tunnel_drop_rx_port(dev, vs->sock, type);
2661 }
2662 }
2663 spin_unlock(&vn->sock_lock);
2664 }
2665
2666 /* Initialize the device structure. */
2667 static void vxlan_setup(struct net_device *dev)
2668 {
2669 struct vxlan_dev *vxlan = netdev_priv(dev);
2670 unsigned int h;
2671
2672 eth_hw_addr_random(dev);
2673 ether_setup(dev);
2674
2675 dev->needs_free_netdev = true;
2676 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2677
2678 dev->features |= NETIF_F_LLTX;
2679 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
2680 dev->features |= NETIF_F_RXCSUM;
2681 dev->features |= NETIF_F_GSO_SOFTWARE;
2682
2683 dev->vlan_features = dev->features;
2684 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2685 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2686 netif_keep_dst(dev);
2687 dev->priv_flags |= IFF_NO_QUEUE;
2688
2689 /* MTU range: 68 - 65535 */
2690 dev->min_mtu = ETH_MIN_MTU;
2691 dev->max_mtu = ETH_MAX_MTU;
2692
2693 INIT_LIST_HEAD(&vxlan->next);
2694 spin_lock_init(&vxlan->hash_lock);
2695
2696 timer_setup(&vxlan->age_timer, vxlan_cleanup, TIMER_DEFERRABLE);
2697
2698 vxlan->dev = dev;
2699
2700 gro_cells_init(&vxlan->gro_cells, dev);
2701
2702 for (h = 0; h < FDB_HASH_SIZE; ++h)
2703 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2704 }
2705
2706 static void vxlan_ether_setup(struct net_device *dev)
2707 {
2708 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2709 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2710 dev->netdev_ops = &vxlan_netdev_ether_ops;
2711 }
2712
2713 static void vxlan_raw_setup(struct net_device *dev)
2714 {
2715 dev->header_ops = NULL;
2716 dev->type = ARPHRD_NONE;
2717 dev->hard_header_len = 0;
2718 dev->addr_len = 0;
2719 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
2720 dev->netdev_ops = &vxlan_netdev_raw_ops;
2721 }
2722
2723 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2724 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
2725 [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2726 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
2727 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
2728 [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2729 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
2730 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
2731 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
2732 [IFLA_VXLAN_LABEL] = { .type = NLA_U32 },
2733 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
2734 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
2735 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
2736 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
2737 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
2738 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
2739 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
2740 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
2741 [IFLA_VXLAN_COLLECT_METADATA] = { .type = NLA_U8 },
2742 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
2743 [IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 },
2744 [IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
2745 [IFLA_VXLAN_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
2746 [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2747 [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
2748 [IFLA_VXLAN_GBP] = { .type = NLA_FLAG, },
2749 [IFLA_VXLAN_GPE] = { .type = NLA_FLAG, },
2750 [IFLA_VXLAN_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG },
2751 [IFLA_VXLAN_TTL_INHERIT] = { .type = NLA_FLAG },
2752 };
2753
2754 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[],
2755 struct netlink_ext_ack *extack)
2756 {
2757 if (tb[IFLA_ADDRESS]) {
2758 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2759 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
2760 "Provided link layer address is not Ethernet");
2761 return -EINVAL;
2762 }
2763
2764 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2765 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
2766 "Provided Ethernet address is not unicast");
2767 return -EADDRNOTAVAIL;
2768 }
2769 }
2770
2771 if (tb[IFLA_MTU]) {
2772 u32 mtu = nla_get_u32(tb[IFLA_MTU]);
2773
2774 if (mtu < ETH_MIN_MTU || mtu > ETH_MAX_MTU) {
2775 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU],
2776 "MTU must be between 68 and 65535");
2777 return -EINVAL;
2778 }
2779 }
2780
2781 if (!data) {
2782 NL_SET_ERR_MSG(extack,
2783 "Required attributes not provided to perform the operation");
2784 return -EINVAL;
2785 }
2786
2787 if (data[IFLA_VXLAN_ID]) {
2788 u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2789
2790 if (id >= VXLAN_N_VID) {
2791 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_ID],
2792 "VXLAN ID must be lower than 16777216");
2793 return -ERANGE;
2794 }
2795 }
2796
2797 if (data[IFLA_VXLAN_PORT_RANGE]) {
2798 const struct ifla_vxlan_port_range *p
2799 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2800
2801 if (ntohs(p->high) < ntohs(p->low)) {
2802 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT_RANGE],
2803 "Invalid source port range");
2804 return -EINVAL;
2805 }
2806 }
2807
2808 return 0;
2809 }
2810
2811 static void vxlan_get_drvinfo(struct net_device *netdev,
2812 struct ethtool_drvinfo *drvinfo)
2813 {
2814 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2815 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2816 }
2817
2818 static const struct ethtool_ops vxlan_ethtool_ops = {
2819 .get_drvinfo = vxlan_get_drvinfo,
2820 .get_link = ethtool_op_get_link,
2821 };
2822
2823 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2824 __be16 port, u32 flags)
2825 {
2826 struct socket *sock;
2827 struct udp_port_cfg udp_conf;
2828 int err;
2829
2830 memset(&udp_conf, 0, sizeof(udp_conf));
2831
2832 if (ipv6) {
2833 udp_conf.family = AF_INET6;
2834 udp_conf.use_udp6_rx_checksums =
2835 !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2836 udp_conf.ipv6_v6only = 1;
2837 } else {
2838 udp_conf.family = AF_INET;
2839 }
2840
2841 udp_conf.local_udp_port = port;
2842
2843 /* Open UDP socket */
2844 err = udp_sock_create(net, &udp_conf, &sock);
2845 if (err < 0)
2846 return ERR_PTR(err);
2847
2848 return sock;
2849 }
2850
2851 /* Create new listen socket if needed */
2852 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
2853 __be16 port, u32 flags)
2854 {
2855 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2856 struct vxlan_sock *vs;
2857 struct socket *sock;
2858 unsigned int h;
2859 struct udp_tunnel_sock_cfg tunnel_cfg;
2860
2861 vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2862 if (!vs)
2863 return ERR_PTR(-ENOMEM);
2864
2865 for (h = 0; h < VNI_HASH_SIZE; ++h)
2866 INIT_HLIST_HEAD(&vs->vni_list[h]);
2867
2868 sock = vxlan_create_sock(net, ipv6, port, flags);
2869 if (IS_ERR(sock)) {
2870 kfree(vs);
2871 return ERR_CAST(sock);
2872 }
2873
2874 vs->sock = sock;
2875 refcount_set(&vs->refcnt, 1);
2876 vs->flags = (flags & VXLAN_F_RCV_FLAGS);
2877
2878 spin_lock(&vn->sock_lock);
2879 hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2880 udp_tunnel_notify_add_rx_port(sock,
2881 (vs->flags & VXLAN_F_GPE) ?
2882 UDP_TUNNEL_TYPE_VXLAN_GPE :
2883 UDP_TUNNEL_TYPE_VXLAN);
2884 spin_unlock(&vn->sock_lock);
2885
2886 /* Mark socket as an encapsulation socket. */
2887 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
2888 tunnel_cfg.sk_user_data = vs;
2889 tunnel_cfg.encap_type = 1;
2890 tunnel_cfg.encap_rcv = vxlan_rcv;
2891 tunnel_cfg.encap_destroy = NULL;
2892 tunnel_cfg.gro_receive = vxlan_gro_receive;
2893 tunnel_cfg.gro_complete = vxlan_gro_complete;
2894
2895 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
2896
2897 return vs;
2898 }
2899
2900 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
2901 {
2902 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2903 struct vxlan_sock *vs = NULL;
2904 struct vxlan_dev_node *node;
2905
2906 if (!vxlan->cfg.no_share) {
2907 spin_lock(&vn->sock_lock);
2908 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
2909 vxlan->cfg.dst_port, vxlan->cfg.flags);
2910 if (vs && !refcount_inc_not_zero(&vs->refcnt)) {
2911 spin_unlock(&vn->sock_lock);
2912 return -EBUSY;
2913 }
2914 spin_unlock(&vn->sock_lock);
2915 }
2916 if (!vs)
2917 vs = vxlan_socket_create(vxlan->net, ipv6,
2918 vxlan->cfg.dst_port, vxlan->cfg.flags);
2919 if (IS_ERR(vs))
2920 return PTR_ERR(vs);
2921 #if IS_ENABLED(CONFIG_IPV6)
2922 if (ipv6) {
2923 rcu_assign_pointer(vxlan->vn6_sock, vs);
2924 node = &vxlan->hlist6;
2925 } else
2926 #endif
2927 {
2928 rcu_assign_pointer(vxlan->vn4_sock, vs);
2929 node = &vxlan->hlist4;
2930 }
2931 vxlan_vs_add_dev(vs, vxlan, node);
2932 return 0;
2933 }
2934
2935 static int vxlan_sock_add(struct vxlan_dev *vxlan)
2936 {
2937 bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA;
2938 bool ipv6 = vxlan->cfg.flags & VXLAN_F_IPV6 || metadata;
2939 bool ipv4 = !ipv6 || metadata;
2940 int ret = 0;
2941
2942 RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
2943 #if IS_ENABLED(CONFIG_IPV6)
2944 RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
2945 if (ipv6) {
2946 ret = __vxlan_sock_add(vxlan, true);
2947 if (ret < 0 && ret != -EAFNOSUPPORT)
2948 ipv4 = false;
2949 }
2950 #endif
2951 if (ipv4)
2952 ret = __vxlan_sock_add(vxlan, false);
2953 if (ret < 0)
2954 vxlan_sock_release(vxlan);
2955 return ret;
2956 }
2957
2958 static int vxlan_config_validate(struct net *src_net, struct vxlan_config *conf,
2959 struct net_device **lower,
2960 struct vxlan_dev *old,
2961 struct netlink_ext_ack *extack)
2962 {
2963 struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
2964 struct vxlan_dev *tmp;
2965 bool use_ipv6 = false;
2966
2967 if (conf->flags & VXLAN_F_GPE) {
2968 /* For now, allow GPE only together with
2969 * COLLECT_METADATA. This can be relaxed later; in such
2970 * case, the other side of the PtP link will have to be
2971 * provided.
2972 */
2973 if ((conf->flags & ~VXLAN_F_ALLOWED_GPE) ||
2974 !(conf->flags & VXLAN_F_COLLECT_METADATA)) {
2975 NL_SET_ERR_MSG(extack,
2976 "VXLAN GPE does not support this combination of attributes");
2977 return -EINVAL;
2978 }
2979 }
2980
2981 if (!conf->remote_ip.sa.sa_family && !conf->saddr.sa.sa_family) {
2982 /* Unless IPv6 is explicitly requested, assume IPv4 */
2983 conf->remote_ip.sa.sa_family = AF_INET;
2984 conf->saddr.sa.sa_family = AF_INET;
2985 } else if (!conf->remote_ip.sa.sa_family) {
2986 conf->remote_ip.sa.sa_family = conf->saddr.sa.sa_family;
2987 } else if (!conf->saddr.sa.sa_family) {
2988 conf->saddr.sa.sa_family = conf->remote_ip.sa.sa_family;
2989 }
2990
2991 if (conf->saddr.sa.sa_family != conf->remote_ip.sa.sa_family) {
2992 NL_SET_ERR_MSG(extack,
2993 "Local and remote address must be from the same family");
2994 return -EINVAL;
2995 }
2996
2997 if (vxlan_addr_multicast(&conf->saddr)) {
2998 NL_SET_ERR_MSG(extack, "Local address cannot be multicast");
2999 return -EINVAL;
3000 }
3001
3002 if (conf->saddr.sa.sa_family == AF_INET6) {
3003 if (!IS_ENABLED(CONFIG_IPV6)) {
3004 NL_SET_ERR_MSG(extack,
3005 "IPv6 support not enabled in the kernel");
3006 return -EPFNOSUPPORT;
3007 }
3008 use_ipv6 = true;
3009 conf->flags |= VXLAN_F_IPV6;
3010
3011 if (!(conf->flags & VXLAN_F_COLLECT_METADATA)) {
3012 int local_type =
3013 ipv6_addr_type(&conf->saddr.sin6.sin6_addr);
3014 int remote_type =
3015 ipv6_addr_type(&conf->remote_ip.sin6.sin6_addr);
3016
3017 if (local_type & IPV6_ADDR_LINKLOCAL) {
3018 if (!(remote_type & IPV6_ADDR_LINKLOCAL) &&
3019 (remote_type != IPV6_ADDR_ANY)) {
3020 NL_SET_ERR_MSG(extack,
3021 "Invalid combination of local and remote address scopes");
3022 return -EINVAL;
3023 }
3024
3025 conf->flags |= VXLAN_F_IPV6_LINKLOCAL;
3026 } else {
3027 if (remote_type ==
3028 (IPV6_ADDR_UNICAST | IPV6_ADDR_LINKLOCAL)) {
3029 NL_SET_ERR_MSG(extack,
3030 "Invalid combination of local and remote address scopes");
3031 return -EINVAL;
3032 }
3033
3034 conf->flags &= ~VXLAN_F_IPV6_LINKLOCAL;
3035 }
3036 }
3037 }
3038
3039 if (conf->label && !use_ipv6) {
3040 NL_SET_ERR_MSG(extack,
3041 "Label attribute only applies to IPv6 VXLAN devices");
3042 return -EINVAL;
3043 }
3044
3045 if (conf->remote_ifindex) {
3046 struct net_device *lowerdev;
3047
3048 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
3049 if (!lowerdev) {
3050 NL_SET_ERR_MSG(extack,
3051 "Invalid local interface, device not found");
3052 return -ENODEV;
3053 }
3054
3055 #if IS_ENABLED(CONFIG_IPV6)
3056 if (use_ipv6) {
3057 struct inet6_dev *idev = __in6_dev_get(lowerdev);
3058 if (idev && idev->cnf.disable_ipv6) {
3059 NL_SET_ERR_MSG(extack,
3060 "IPv6 support disabled by administrator");
3061 return -EPERM;
3062 }
3063 }
3064 #endif
3065
3066 *lower = lowerdev;
3067 } else {
3068 if (vxlan_addr_multicast(&conf->remote_ip)) {
3069 NL_SET_ERR_MSG(extack,
3070 "Local interface required for multicast remote destination");
3071
3072 return -EINVAL;
3073 }
3074
3075 #if IS_ENABLED(CONFIG_IPV6)
3076 if (conf->flags & VXLAN_F_IPV6_LINKLOCAL) {
3077 NL_SET_ERR_MSG(extack,
3078 "Local interface required for link-local local/remote addresses");
3079 return -EINVAL;
3080 }
3081 #endif
3082
3083 *lower = NULL;
3084 }
3085
3086 if (!conf->dst_port) {
3087 if (conf->flags & VXLAN_F_GPE)
3088 conf->dst_port = htons(4790); /* IANA VXLAN-GPE port */
3089 else
3090 conf->dst_port = htons(vxlan_port);
3091 }
3092
3093 if (!conf->age_interval)
3094 conf->age_interval = FDB_AGE_DEFAULT;
3095
3096 list_for_each_entry(tmp, &vn->vxlan_list, next) {
3097 if (tmp == old)
3098 continue;
3099
3100 if (tmp->cfg.vni != conf->vni)
3101 continue;
3102 if (tmp->cfg.dst_port != conf->dst_port)
3103 continue;
3104 if ((tmp->cfg.flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)) !=
3105 (conf->flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)))
3106 continue;
3107
3108 if ((conf->flags & VXLAN_F_IPV6_LINKLOCAL) &&
3109 tmp->cfg.remote_ifindex != conf->remote_ifindex)
3110 continue;
3111
3112 NL_SET_ERR_MSG(extack,
3113 "A VXLAN device with the specified VNI already exists");
3114 return -EEXIST;
3115 }
3116
3117 return 0;
3118 }
3119
3120 static void vxlan_config_apply(struct net_device *dev,
3121 struct vxlan_config *conf,
3122 struct net_device *lowerdev,
3123 struct net *src_net,
3124 bool changelink)
3125 {
3126 struct vxlan_dev *vxlan = netdev_priv(dev);
3127 struct vxlan_rdst *dst = &vxlan->default_dst;
3128 unsigned short needed_headroom = ETH_HLEN;
3129 bool use_ipv6 = !!(conf->flags & VXLAN_F_IPV6);
3130 int max_mtu = ETH_MAX_MTU;
3131
3132 if (!changelink) {
3133 if (conf->flags & VXLAN_F_GPE)
3134 vxlan_raw_setup(dev);
3135 else
3136 vxlan_ether_setup(dev);
3137
3138 if (conf->mtu)
3139 dev->mtu = conf->mtu;
3140
3141 vxlan->net = src_net;
3142 }
3143
3144 dst->remote_vni = conf->vni;
3145
3146 memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
3147
3148 if (lowerdev) {
3149 dst->remote_ifindex = conf->remote_ifindex;
3150
3151 dev->gso_max_size = lowerdev->gso_max_size;
3152 dev->gso_max_segs = lowerdev->gso_max_segs;
3153
3154 needed_headroom = lowerdev->hard_header_len;
3155
3156 max_mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM :
3157 VXLAN_HEADROOM);
3158 if (max_mtu < ETH_MIN_MTU)
3159 max_mtu = ETH_MIN_MTU;
3160
3161 if (!changelink && !conf->mtu)
3162 dev->mtu = max_mtu;
3163 }
3164
3165 if (dev->mtu > max_mtu)
3166 dev->mtu = max_mtu;
3167
3168 if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
3169 needed_headroom += VXLAN6_HEADROOM;
3170 else
3171 needed_headroom += VXLAN_HEADROOM;
3172 dev->needed_headroom = needed_headroom;
3173
3174 memcpy(&vxlan->cfg, conf, sizeof(*conf));
3175 }
3176
3177 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
3178 struct vxlan_config *conf, bool changelink,
3179 struct netlink_ext_ack *extack)
3180 {
3181 struct vxlan_dev *vxlan = netdev_priv(dev);
3182 struct net_device *lowerdev;
3183 int ret;
3184
3185 ret = vxlan_config_validate(src_net, conf, &lowerdev, vxlan, extack);
3186 if (ret)
3187 return ret;
3188
3189 vxlan_config_apply(dev, conf, lowerdev, src_net, changelink);
3190
3191 return 0;
3192 }
3193
3194 static int __vxlan_dev_create(struct net *net, struct net_device *dev,
3195 struct vxlan_config *conf,
3196 struct netlink_ext_ack *extack)
3197 {
3198 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3199 struct vxlan_dev *vxlan = netdev_priv(dev);
3200 struct vxlan_fdb *f = NULL;
3201 int err;
3202
3203 err = vxlan_dev_configure(net, dev, conf, false, extack);
3204 if (err)
3205 return err;
3206
3207 dev->ethtool_ops = &vxlan_ethtool_ops;
3208
3209 /* create an fdb entry for a valid default destination */
3210 if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
3211 err = vxlan_fdb_create(vxlan, all_zeros_mac,
3212 &vxlan->default_dst.remote_ip,
3213 NUD_REACHABLE | NUD_PERMANENT,
3214 vxlan->cfg.dst_port,
3215 vxlan->default_dst.remote_vni,
3216 vxlan->default_dst.remote_vni,
3217 vxlan->default_dst.remote_ifindex,
3218 NTF_SELF, &f);
3219 if (err)
3220 return err;
3221 }
3222
3223 err = register_netdevice(dev);
3224 if (err)
3225 goto errout;
3226
3227 err = rtnl_configure_link(dev, NULL);
3228 if (err) {
3229 unregister_netdevice(dev);
3230 goto errout;
3231 }
3232
3233 /* notify default fdb entry */
3234 if (f)
3235 vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_NEWNEIGH);
3236
3237 list_add(&vxlan->next, &vn->vxlan_list);
3238 return 0;
3239 errout:
3240 if (f)
3241 vxlan_fdb_destroy(vxlan, f, false);
3242 return err;
3243 }
3244
3245 static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[],
3246 struct net_device *dev, struct vxlan_config *conf,
3247 bool changelink)
3248 {
3249 struct vxlan_dev *vxlan = netdev_priv(dev);
3250
3251 memset(conf, 0, sizeof(*conf));
3252
3253 /* if changelink operation, start with old existing cfg */
3254 if (changelink)
3255 memcpy(conf, &vxlan->cfg, sizeof(*conf));
3256
3257 if (data[IFLA_VXLAN_ID]) {
3258 __be32 vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
3259
3260 if (changelink && (vni != conf->vni))
3261 return -EOPNOTSUPP;
3262 conf->vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
3263 }
3264
3265 if (data[IFLA_VXLAN_GROUP]) {
3266 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET))
3267 return -EOPNOTSUPP;
3268
3269 conf->remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
3270 conf->remote_ip.sa.sa_family = AF_INET;
3271 } else if (data[IFLA_VXLAN_GROUP6]) {
3272 if (!IS_ENABLED(CONFIG_IPV6))
3273 return -EPFNOSUPPORT;
3274
3275 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET6))
3276 return -EOPNOTSUPP;
3277
3278 conf->remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
3279 conf->remote_ip.sa.sa_family = AF_INET6;
3280 }
3281
3282 if (data[IFLA_VXLAN_LOCAL]) {
3283 if (changelink && (conf->saddr.sa.sa_family != AF_INET))
3284 return -EOPNOTSUPP;
3285
3286 conf->saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
3287 conf->saddr.sa.sa_family = AF_INET;
3288 } else if (data[IFLA_VXLAN_LOCAL6]) {
3289 if (!IS_ENABLED(CONFIG_IPV6))
3290 return -EPFNOSUPPORT;
3291
3292 if (changelink && (conf->saddr.sa.sa_family != AF_INET6))
3293 return -EOPNOTSUPP;
3294
3295 /* TODO: respect scope id */
3296 conf->saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
3297 conf->saddr.sa.sa_family = AF_INET6;
3298 }
3299
3300 if (data[IFLA_VXLAN_LINK])
3301 conf->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
3302
3303 if (data[IFLA_VXLAN_TOS])
3304 conf->tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
3305
3306 if (data[IFLA_VXLAN_TTL])
3307 conf->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
3308
3309 if (data[IFLA_VXLAN_TTL_INHERIT]) {
3310 if (changelink)
3311 return -EOPNOTSUPP;
3312 conf->flags |= VXLAN_F_TTL_INHERIT;
3313 }
3314
3315 if (data[IFLA_VXLAN_LABEL])
3316 conf->label = nla_get_be32(data[IFLA_VXLAN_LABEL]) &
3317 IPV6_FLOWLABEL_MASK;
3318
3319 if (data[IFLA_VXLAN_LEARNING]) {
3320 if (nla_get_u8(data[IFLA_VXLAN_LEARNING]))
3321 conf->flags |= VXLAN_F_LEARN;
3322 else
3323 conf->flags &= ~VXLAN_F_LEARN;
3324 } else if (!changelink) {
3325 /* default to learn on a new device */
3326 conf->flags |= VXLAN_F_LEARN;
3327 }
3328
3329 if (data[IFLA_VXLAN_AGEING]) {
3330 if (changelink)
3331 return -EOPNOTSUPP;
3332 conf->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
3333 }
3334
3335 if (data[IFLA_VXLAN_PROXY]) {
3336 if (changelink)
3337 return -EOPNOTSUPP;
3338 if (nla_get_u8(data[IFLA_VXLAN_PROXY]))
3339 conf->flags |= VXLAN_F_PROXY;
3340 }
3341
3342 if (data[IFLA_VXLAN_RSC]) {
3343 if (changelink)
3344 return -EOPNOTSUPP;
3345 if (nla_get_u8(data[IFLA_VXLAN_RSC]))
3346 conf->flags |= VXLAN_F_RSC;
3347 }
3348
3349 if (data[IFLA_VXLAN_L2MISS]) {
3350 if (changelink)
3351 return -EOPNOTSUPP;
3352 if (nla_get_u8(data[IFLA_VXLAN_L2MISS]))
3353 conf->flags |= VXLAN_F_L2MISS;
3354 }
3355
3356 if (data[IFLA_VXLAN_L3MISS]) {
3357 if (changelink)
3358 return -EOPNOTSUPP;
3359 if (nla_get_u8(data[IFLA_VXLAN_L3MISS]))
3360 conf->flags |= VXLAN_F_L3MISS;
3361 }
3362
3363 if (data[IFLA_VXLAN_LIMIT]) {
3364 if (changelink)
3365 return -EOPNOTSUPP;
3366 conf->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
3367 }
3368
3369 if (data[IFLA_VXLAN_COLLECT_METADATA]) {
3370 if (changelink)
3371 return -EOPNOTSUPP;
3372 if (nla_get_u8(data[IFLA_VXLAN_COLLECT_METADATA]))
3373 conf->flags |= VXLAN_F_COLLECT_METADATA;
3374 }
3375
3376 if (data[IFLA_VXLAN_PORT_RANGE]) {
3377 if (!changelink) {
3378 const struct ifla_vxlan_port_range *p
3379 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
3380 conf->port_min = ntohs(p->low);
3381 conf->port_max = ntohs(p->high);
3382 } else {
3383 return -EOPNOTSUPP;
3384 }
3385 }
3386
3387 if (data[IFLA_VXLAN_PORT]) {
3388 if (changelink)
3389 return -EOPNOTSUPP;
3390 conf->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
3391 }
3392
3393 if (data[IFLA_VXLAN_UDP_CSUM]) {
3394 if (changelink)
3395 return -EOPNOTSUPP;
3396 if (!nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
3397 conf->flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
3398 }
3399
3400 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]) {
3401 if (changelink)
3402 return -EOPNOTSUPP;
3403 if (nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
3404 conf->flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
3405 }
3406
3407 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]) {
3408 if (changelink)
3409 return -EOPNOTSUPP;
3410 if (nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
3411 conf->flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
3412 }
3413
3414 if (data[IFLA_VXLAN_REMCSUM_TX]) {
3415 if (changelink)
3416 return -EOPNOTSUPP;
3417 if (nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
3418 conf->flags |= VXLAN_F_REMCSUM_TX;
3419 }
3420
3421 if (data[IFLA_VXLAN_REMCSUM_RX]) {
3422 if (changelink)
3423 return -EOPNOTSUPP;
3424 if (nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
3425 conf->flags |= VXLAN_F_REMCSUM_RX;
3426 }
3427
3428 if (data[IFLA_VXLAN_GBP]) {
3429 if (changelink)
3430 return -EOPNOTSUPP;
3431 conf->flags |= VXLAN_F_GBP;
3432 }
3433
3434 if (data[IFLA_VXLAN_GPE]) {
3435 if (changelink)
3436 return -EOPNOTSUPP;
3437 conf->flags |= VXLAN_F_GPE;
3438 }
3439
3440 if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL]) {
3441 if (changelink)
3442 return -EOPNOTSUPP;
3443 conf->flags |= VXLAN_F_REMCSUM_NOPARTIAL;
3444 }
3445
3446 if (tb[IFLA_MTU]) {
3447 if (changelink)
3448 return -EOPNOTSUPP;
3449 conf->mtu = nla_get_u32(tb[IFLA_MTU]);
3450 }
3451
3452 return 0;
3453 }
3454
3455 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
3456 struct nlattr *tb[], struct nlattr *data[],
3457 struct netlink_ext_ack *extack)
3458 {
3459 struct vxlan_config conf;
3460 int err;
3461
3462 err = vxlan_nl2conf(tb, data, dev, &conf, false);
3463 if (err)
3464 return err;
3465
3466 return __vxlan_dev_create(src_net, dev, &conf, extack);
3467 }
3468
3469 static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[],
3470 struct nlattr *data[],
3471 struct netlink_ext_ack *extack)
3472 {
3473 struct vxlan_dev *vxlan = netdev_priv(dev);
3474 struct vxlan_rdst *dst = &vxlan->default_dst;
3475 struct vxlan_rdst old_dst;
3476 struct vxlan_config conf;
3477 struct vxlan_fdb *f = NULL;
3478 int err;
3479
3480 err = vxlan_nl2conf(tb, data,
3481 dev, &conf, true);
3482 if (err)
3483 return err;
3484
3485 memcpy(&old_dst, dst, sizeof(struct vxlan_rdst));
3486
3487 err = vxlan_dev_configure(vxlan->net, dev, &conf, true, extack);
3488 if (err)
3489 return err;
3490
3491 /* handle default dst entry */
3492 if (!vxlan_addr_equal(&dst->remote_ip, &old_dst.remote_ip)) {
3493 spin_lock_bh(&vxlan->hash_lock);
3494 if (!vxlan_addr_any(&old_dst.remote_ip))
3495 __vxlan_fdb_delete(vxlan, all_zeros_mac,
3496 old_dst.remote_ip,
3497 vxlan->cfg.dst_port,
3498 old_dst.remote_vni,
3499 old_dst.remote_vni,
3500 old_dst.remote_ifindex, 0);
3501
3502 if (!vxlan_addr_any(&dst->remote_ip)) {
3503 err = vxlan_fdb_create(vxlan, all_zeros_mac,
3504 &dst->remote_ip,
3505 NUD_REACHABLE | NUD_PERMANENT,
3506 vxlan->cfg.dst_port,
3507 dst->remote_vni,
3508 dst->remote_vni,
3509 dst->remote_ifindex,
3510 NTF_SELF, &f);
3511 if (err) {
3512 spin_unlock_bh(&vxlan->hash_lock);
3513 return err;
3514 }
3515 vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_NEWNEIGH);
3516 }
3517 spin_unlock_bh(&vxlan->hash_lock);
3518 }
3519
3520 return 0;
3521 }
3522
3523 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
3524 {
3525 struct vxlan_dev *vxlan = netdev_priv(dev);
3526
3527 vxlan_flush(vxlan, true);
3528
3529 gro_cells_destroy(&vxlan->gro_cells);
3530 list_del(&vxlan->next);
3531 unregister_netdevice_queue(dev, head);
3532 }
3533
3534 static size_t vxlan_get_size(const struct net_device *dev)
3535 {
3536
3537 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
3538 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
3539 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
3540 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
3541 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
3542 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
3543 nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */
3544 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
3545 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
3546 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
3547 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
3548 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
3549 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_COLLECT_METADATA */
3550 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
3551 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
3552 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
3553 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
3554 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
3555 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
3556 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
3557 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
3558 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
3559 0;
3560 }
3561
3562 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
3563 {
3564 const struct vxlan_dev *vxlan = netdev_priv(dev);
3565 const struct vxlan_rdst *dst = &vxlan->default_dst;
3566 struct ifla_vxlan_port_range ports = {
3567 .low = htons(vxlan->cfg.port_min),
3568 .high = htons(vxlan->cfg.port_max),
3569 };
3570
3571 if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni)))
3572 goto nla_put_failure;
3573
3574 if (!vxlan_addr_any(&dst->remote_ip)) {
3575 if (dst->remote_ip.sa.sa_family == AF_INET) {
3576 if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
3577 dst->remote_ip.sin.sin_addr.s_addr))
3578 goto nla_put_failure;
3579 #if IS_ENABLED(CONFIG_IPV6)
3580 } else {
3581 if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
3582 &dst->remote_ip.sin6.sin6_addr))
3583 goto nla_put_failure;
3584 #endif
3585 }
3586 }
3587
3588 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
3589 goto nla_put_failure;
3590
3591 if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
3592 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
3593 if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
3594 vxlan->cfg.saddr.sin.sin_addr.s_addr))
3595 goto nla_put_failure;
3596 #if IS_ENABLED(CONFIG_IPV6)
3597 } else {
3598 if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
3599 &vxlan->cfg.saddr.sin6.sin6_addr))
3600 goto nla_put_failure;
3601 #endif
3602 }
3603 }
3604
3605 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
3606 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
3607 nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) ||
3608 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
3609 !!(vxlan->cfg.flags & VXLAN_F_LEARN)) ||
3610 nla_put_u8(skb, IFLA_VXLAN_PROXY,
3611 !!(vxlan->cfg.flags & VXLAN_F_PROXY)) ||
3612 nla_put_u8(skb, IFLA_VXLAN_RSC,
3613 !!(vxlan->cfg.flags & VXLAN_F_RSC)) ||
3614 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
3615 !!(vxlan->cfg.flags & VXLAN_F_L2MISS)) ||
3616 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
3617 !!(vxlan->cfg.flags & VXLAN_F_L3MISS)) ||
3618 nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
3619 !!(vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)) ||
3620 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
3621 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
3622 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
3623 nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
3624 !(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
3625 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
3626 !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
3627 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
3628 !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
3629 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
3630 !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_TX)) ||
3631 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
3632 !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_RX)))
3633 goto nla_put_failure;
3634
3635 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
3636 goto nla_put_failure;
3637
3638 if (vxlan->cfg.flags & VXLAN_F_GBP &&
3639 nla_put_flag(skb, IFLA_VXLAN_GBP))
3640 goto nla_put_failure;
3641
3642 if (vxlan->cfg.flags & VXLAN_F_GPE &&
3643 nla_put_flag(skb, IFLA_VXLAN_GPE))
3644 goto nla_put_failure;
3645
3646 if (vxlan->cfg.flags & VXLAN_F_REMCSUM_NOPARTIAL &&
3647 nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
3648 goto nla_put_failure;
3649
3650 return 0;
3651
3652 nla_put_failure:
3653 return -EMSGSIZE;
3654 }
3655
3656 static struct net *vxlan_get_link_net(const struct net_device *dev)
3657 {
3658 struct vxlan_dev *vxlan = netdev_priv(dev);
3659
3660 return vxlan->net;
3661 }
3662
3663 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
3664 .kind = "vxlan",
3665 .maxtype = IFLA_VXLAN_MAX,
3666 .policy = vxlan_policy,
3667 .priv_size = sizeof(struct vxlan_dev),
3668 .setup = vxlan_setup,
3669 .validate = vxlan_validate,
3670 .newlink = vxlan_newlink,
3671 .changelink = vxlan_changelink,
3672 .dellink = vxlan_dellink,
3673 .get_size = vxlan_get_size,
3674 .fill_info = vxlan_fill_info,
3675 .get_link_net = vxlan_get_link_net,
3676 };
3677
3678 struct net_device *vxlan_dev_create(struct net *net, const char *name,
3679 u8 name_assign_type,
3680 struct vxlan_config *conf)
3681 {
3682 struct nlattr *tb[IFLA_MAX + 1];
3683 struct net_device *dev;
3684 int err;
3685
3686 memset(&tb, 0, sizeof(tb));
3687
3688 dev = rtnl_create_link(net, name, name_assign_type,
3689 &vxlan_link_ops, tb);
3690 if (IS_ERR(dev))
3691 return dev;
3692
3693 err = __vxlan_dev_create(net, dev, conf, NULL);
3694 if (err < 0) {
3695 free_netdev(dev);
3696 return ERR_PTR(err);
3697 }
3698
3699 err = rtnl_configure_link(dev, NULL);
3700 if (err < 0) {
3701 LIST_HEAD(list_kill);
3702
3703 vxlan_dellink(dev, &list_kill);
3704 unregister_netdevice_many(&list_kill);
3705 return ERR_PTR(err);
3706 }
3707
3708 return dev;
3709 }
3710 EXPORT_SYMBOL_GPL(vxlan_dev_create);
3711
3712 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
3713 struct net_device *dev)
3714 {
3715 struct vxlan_dev *vxlan, *next;
3716 LIST_HEAD(list_kill);
3717
3718 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3719 struct vxlan_rdst *dst = &vxlan->default_dst;
3720
3721 /* In case we created vxlan device with carrier
3722 * and we loose the carrier due to module unload
3723 * we also need to remove vxlan device. In other
3724 * cases, it's not necessary and remote_ifindex
3725 * is 0 here, so no matches.
3726 */
3727 if (dst->remote_ifindex == dev->ifindex)
3728 vxlan_dellink(vxlan->dev, &list_kill);
3729 }
3730
3731 unregister_netdevice_many(&list_kill);
3732 }
3733
3734 static int vxlan_netdevice_event(struct notifier_block *unused,
3735 unsigned long event, void *ptr)
3736 {
3737 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3738 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
3739
3740 if (event == NETDEV_UNREGISTER) {
3741 vxlan_offload_rx_ports(dev, false);
3742 vxlan_handle_lowerdev_unregister(vn, dev);
3743 } else if (event == NETDEV_REGISTER) {
3744 vxlan_offload_rx_ports(dev, true);
3745 } else if (event == NETDEV_UDP_TUNNEL_PUSH_INFO ||
3746 event == NETDEV_UDP_TUNNEL_DROP_INFO) {
3747 vxlan_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO);
3748 }
3749
3750 return NOTIFY_DONE;
3751 }
3752
3753 static struct notifier_block vxlan_notifier_block __read_mostly = {
3754 .notifier_call = vxlan_netdevice_event,
3755 };
3756
3757 static __net_init int vxlan_init_net(struct net *net)
3758 {
3759 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3760 unsigned int h;
3761
3762 INIT_LIST_HEAD(&vn->vxlan_list);
3763 spin_lock_init(&vn->sock_lock);
3764
3765 for (h = 0; h < PORT_HASH_SIZE; ++h)
3766 INIT_HLIST_HEAD(&vn->sock_list[h]);
3767
3768 return 0;
3769 }
3770
3771 static void vxlan_destroy_tunnels(struct net *net, struct list_head *head)
3772 {
3773 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3774 struct vxlan_dev *vxlan, *next;
3775 struct net_device *dev, *aux;
3776 unsigned int h;
3777
3778 for_each_netdev_safe(net, dev, aux)
3779 if (dev->rtnl_link_ops == &vxlan_link_ops)
3780 unregister_netdevice_queue(dev, head);
3781
3782 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3783 /* If vxlan->dev is in the same netns, it has already been added
3784 * to the list by the previous loop.
3785 */
3786 if (!net_eq(dev_net(vxlan->dev), net)) {
3787 gro_cells_destroy(&vxlan->gro_cells);
3788 unregister_netdevice_queue(vxlan->dev, head);
3789 }
3790 }
3791
3792 for (h = 0; h < PORT_HASH_SIZE; ++h)
3793 WARN_ON_ONCE(!hlist_empty(&vn->sock_list[h]));
3794 }
3795
3796 static void __net_exit vxlan_exit_batch_net(struct list_head *net_list)
3797 {
3798 struct net *net;
3799 LIST_HEAD(list);
3800
3801 rtnl_lock();
3802 list_for_each_entry(net, net_list, exit_list)
3803 vxlan_destroy_tunnels(net, &list);
3804
3805 unregister_netdevice_many(&list);
3806 rtnl_unlock();
3807 }
3808
3809 static struct pernet_operations vxlan_net_ops = {
3810 .init = vxlan_init_net,
3811 .exit_batch = vxlan_exit_batch_net,
3812 .id = &vxlan_net_id,
3813 .size = sizeof(struct vxlan_net),
3814 };
3815
3816 static int __init vxlan_init_module(void)
3817 {
3818 int rc;
3819
3820 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
3821
3822 rc = register_pernet_subsys(&vxlan_net_ops);
3823 if (rc)
3824 goto out1;
3825
3826 rc = register_netdevice_notifier(&vxlan_notifier_block);
3827 if (rc)
3828 goto out2;
3829
3830 rc = rtnl_link_register(&vxlan_link_ops);
3831 if (rc)
3832 goto out3;
3833
3834 return 0;
3835 out3:
3836 unregister_netdevice_notifier(&vxlan_notifier_block);
3837 out2:
3838 unregister_pernet_subsys(&vxlan_net_ops);
3839 out1:
3840 return rc;
3841 }
3842 late_initcall(vxlan_init_module);
3843
3844 static void __exit vxlan_cleanup_module(void)
3845 {
3846 rtnl_link_unregister(&vxlan_link_ops);
3847 unregister_netdevice_notifier(&vxlan_notifier_block);
3848 unregister_pernet_subsys(&vxlan_net_ops);
3849 /* rcu_barrier() is called by netns */
3850 }
3851 module_exit(vxlan_cleanup_module);
3852
3853 MODULE_LICENSE("GPL");
3854 MODULE_VERSION(VXLAN_VERSION);
3855 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
3856 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
3857 MODULE_ALIAS_RTNL_LINK("vxlan");
Linux with added FPC-III support