1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * VXLAN: Virtual eXtensible Local Area Network
4 *
5 * Copyright (c) 2012-2013 Vyatta Inc.
6 */
7
8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <linux/errno.h>
13 #include <linux/slab.h>
14 #include <linux/udp.h>
15 #include <linux/igmp.h>
16 #include <linux/if_ether.h>
17 #include <linux/ethtool.h>
18 #include <net/arp.h>
19 #include <net/ndisc.h>
20 #include <net/ipv6_stubs.h>
21 #include <net/ip.h>
22 #include <net/icmp.h>
23 #include <net/rtnetlink.h>
24 #include <net/inet_ecn.h>
25 #include <net/net_namespace.h>
26 #include <net/netns/generic.h>
27 #include <net/tun_proto.h>
28 #include <net/vxlan.h>
29 #include <net/nexthop.h>
30
31 #if IS_ENABLED(CONFIG_IPV6)
32 #include <net/ip6_tunnel.h>
33 #include <net/ip6_checksum.h>
34 #endif
35
36 #define VXLAN_VERSION "0.1"
37
38 #define PORT_HASH_BITS 8
39 #define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
40 #define FDB_AGE_DEFAULT 300 /* 5 min */
41 #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
42
43 /* UDP port for VXLAN traffic.
44 * The IANA assigned port is 4789, but the Linux default is 8472
45 * for compatibility with early adopters.
46 */
47 static unsigned short vxlan_port __read_mostly = 8472;
48 module_param_named(udp_port, vxlan_port, ushort, 0444);
49 MODULE_PARM_DESC(udp_port, "Destination UDP port");
50
51 static bool log_ecn_error = true;
52 module_param(log_ecn_error, bool, 0644);
53 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
54
55 static unsigned int vxlan_net_id;
56 static struct rtnl_link_ops vxlan_link_ops;
57
58 static const u8 all_zeros_mac[ETH_ALEN + 2];
59
60 static int vxlan_sock_add(struct vxlan_dev *vxlan);
61
62 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan);
63
64 /* per-network namespace private data for this module */
65 struct vxlan_net {
66 struct list_head vxlan_list;
67 struct hlist_head sock_list[PORT_HASH_SIZE];
68 spinlock_t sock_lock;
69 struct notifier_block nexthop_notifier_block;
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 u16 flags; /* see ndm_flags and below */
83 struct list_head nh_list;
84 struct nexthop __rcu *nh;
85 struct vxlan_dev __rcu *vdev;
86 };
87
88 #define NTF_VXLAN_ADDED_BY_USER 0x100
89
90 /* salt for hash table */
91 static u32 vxlan_salt __read_mostly;
92
vxlan_collect_metadata(struct vxlan_sock * vs)93 static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
94 {
95 return vs->flags & VXLAN_F_COLLECT_METADATA ||
96 ip_tunnel_collect_metadata();
97 }
98
99 #if IS_ENABLED(CONFIG_IPV6)
100 static inline
vxlan_addr_equal(const union vxlan_addr * a,const union vxlan_addr * b)101 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
102 {
103 if (a->sa.sa_family != b->sa.sa_family)
104 return false;
105 if (a->sa.sa_family == AF_INET6)
106 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
107 else
108 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
109 }
110
vxlan_nla_get_addr(union vxlan_addr * ip,struct nlattr * nla)111 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
112 {
113 if (nla_len(nla) >= sizeof(struct in6_addr)) {
114 ip->sin6.sin6_addr = nla_get_in6_addr(nla);
115 ip->sa.sa_family = AF_INET6;
116 return 0;
117 } else if (nla_len(nla) >= sizeof(__be32)) {
118 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
119 ip->sa.sa_family = AF_INET;
120 return 0;
121 } else {
122 return -EAFNOSUPPORT;
123 }
124 }
125
vxlan_nla_put_addr(struct sk_buff * skb,int attr,const union vxlan_addr * ip)126 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
127 const union vxlan_addr *ip)
128 {
129 if (ip->sa.sa_family == AF_INET6)
130 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
131 else
132 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
133 }
134
135 #else /* !CONFIG_IPV6 */
136
137 static inline
vxlan_addr_equal(const union vxlan_addr * a,const union vxlan_addr * b)138 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
139 {
140 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
141 }
142
vxlan_nla_get_addr(union vxlan_addr * ip,struct nlattr * nla)143 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
144 {
145 if (nla_len(nla) >= sizeof(struct in6_addr)) {
146 return -EAFNOSUPPORT;
147 } else if (nla_len(nla) >= sizeof(__be32)) {
148 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
149 ip->sa.sa_family = AF_INET;
150 return 0;
151 } else {
152 return -EAFNOSUPPORT;
153 }
154 }
155
vxlan_nla_put_addr(struct sk_buff * skb,int attr,const union vxlan_addr * ip)156 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
157 const union vxlan_addr *ip)
158 {
159 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
160 }
161 #endif
162
163 /* Virtual Network hash table head */
vni_head(struct vxlan_sock * vs,__be32 vni)164 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, __be32 vni)
165 {
166 return &vs->vni_list[hash_32((__force u32)vni, VNI_HASH_BITS)];
167 }
168
169 /* Socket hash table head */
vs_head(struct net * net,__be16 port)170 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
171 {
172 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
173
174 return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
175 }
176
177 /* First remote destination for a forwarding entry.
178 * Guaranteed to be non-NULL because remotes are never deleted.
179 */
first_remote_rcu(struct vxlan_fdb * fdb)180 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
181 {
182 if (rcu_access_pointer(fdb->nh))
183 return NULL;
184 return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
185 }
186
first_remote_rtnl(struct vxlan_fdb * fdb)187 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
188 {
189 if (rcu_access_pointer(fdb->nh))
190 return NULL;
191 return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
192 }
193
194 /* Find VXLAN socket based on network namespace, address family, UDP port,
195 * enabled unshareable flags and socket device binding (see l3mdev with
196 * non-default VRF).
197 */
vxlan_find_sock(struct net * net,sa_family_t family,__be16 port,u32 flags,int ifindex)198 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
199 __be16 port, u32 flags, int ifindex)
200 {
201 struct vxlan_sock *vs;
202
203 flags &= VXLAN_F_RCV_FLAGS;
204
205 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
206 if (inet_sk(vs->sock->sk)->inet_sport == port &&
207 vxlan_get_sk_family(vs) == family &&
208 vs->flags == flags &&
209 vs->sock->sk->sk_bound_dev_if == ifindex)
210 return vs;
211 }
212 return NULL;
213 }
214
vxlan_vs_find_vni(struct vxlan_sock * vs,int ifindex,__be32 vni)215 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, int ifindex,
216 __be32 vni)
217 {
218 struct vxlan_dev_node *node;
219
220 /* For flow based devices, map all packets to VNI 0 */
221 if (vs->flags & VXLAN_F_COLLECT_METADATA)
222 vni = 0;
223
224 hlist_for_each_entry_rcu(node, vni_head(vs, vni), hlist) {
225 if (node->vxlan->default_dst.remote_vni != vni)
226 continue;
227
228 if (IS_ENABLED(CONFIG_IPV6)) {
229 const struct vxlan_config *cfg = &node->vxlan->cfg;
230
231 if ((cfg->flags & VXLAN_F_IPV6_LINKLOCAL) &&
232 cfg->remote_ifindex != ifindex)
233 continue;
234 }
235
236 return node->vxlan;
237 }
238
239 return NULL;
240 }
241
242 /* Look up VNI in a per net namespace table */
vxlan_find_vni(struct net * net,int ifindex,__be32 vni,sa_family_t family,__be16 port,u32 flags)243 static struct vxlan_dev *vxlan_find_vni(struct net *net, int ifindex,
244 __be32 vni, sa_family_t family,
245 __be16 port, u32 flags)
246 {
247 struct vxlan_sock *vs;
248
249 vs = vxlan_find_sock(net, family, port, flags, ifindex);
250 if (!vs)
251 return NULL;
252
253 return vxlan_vs_find_vni(vs, ifindex, vni);
254 }
255
256 /* Fill in neighbour message in skbuff. */
vxlan_fdb_info(struct sk_buff * skb,struct vxlan_dev * vxlan,const struct vxlan_fdb * fdb,u32 portid,u32 seq,int type,unsigned int flags,const struct vxlan_rdst * rdst)257 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
258 const struct vxlan_fdb *fdb,
259 u32 portid, u32 seq, int type, unsigned int flags,
260 const struct vxlan_rdst *rdst)
261 {
262 unsigned long now = jiffies;
263 struct nda_cacheinfo ci;
264 bool send_ip, send_eth;
265 struct nlmsghdr *nlh;
266 struct nexthop *nh;
267 struct ndmsg *ndm;
268 int nh_family;
269 u32 nh_id;
270
271 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
272 if (nlh == NULL)
273 return -EMSGSIZE;
274
275 ndm = nlmsg_data(nlh);
276 memset(ndm, 0, sizeof(*ndm));
277
278 send_eth = send_ip = true;
279
280 rcu_read_lock();
281 nh = rcu_dereference(fdb->nh);
282 if (nh) {
283 nh_family = nexthop_get_family(nh);
284 nh_id = nh->id;
285 }
286 rcu_read_unlock();
287
288 if (type == RTM_GETNEIGH) {
289 if (rdst) {
290 send_ip = !vxlan_addr_any(&rdst->remote_ip);
291 ndm->ndm_family = send_ip ? rdst->remote_ip.sa.sa_family : AF_INET;
292 } else if (nh) {
293 ndm->ndm_family = nh_family;
294 }
295 send_eth = !is_zero_ether_addr(fdb->eth_addr);
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 if (rdst && rdst->offloaded)
302 ndm->ndm_flags |= NTF_OFFLOADED;
303 ndm->ndm_type = RTN_UNICAST;
304
305 if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
306 nla_put_s32(skb, NDA_LINK_NETNSID,
307 peernet2id(dev_net(vxlan->dev), vxlan->net)))
308 goto nla_put_failure;
309
310 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
311 goto nla_put_failure;
312 if (nh) {
313 if (nla_put_u32(skb, NDA_NH_ID, nh_id))
314 goto nla_put_failure;
315 } else if (rdst) {
316 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST,
317 &rdst->remote_ip))
318 goto nla_put_failure;
319
320 if (rdst->remote_port &&
321 rdst->remote_port != vxlan->cfg.dst_port &&
322 nla_put_be16(skb, NDA_PORT, rdst->remote_port))
323 goto nla_put_failure;
324 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
325 nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni)))
326 goto nla_put_failure;
327 if (rdst->remote_ifindex &&
328 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
329 goto nla_put_failure;
330 }
331
332 if ((vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) && fdb->vni &&
333 nla_put_u32(skb, NDA_SRC_VNI,
334 be32_to_cpu(fdb->vni)))
335 goto nla_put_failure;
336
337 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
338 ci.ndm_confirmed = 0;
339 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
340 ci.ndm_refcnt = 0;
341
342 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
343 goto nla_put_failure;
344
345 nlmsg_end(skb, nlh);
346 return 0;
347
348 nla_put_failure:
349 nlmsg_cancel(skb, nlh);
350 return -EMSGSIZE;
351 }
352
vxlan_nlmsg_size(void)353 static inline size_t vxlan_nlmsg_size(void)
354 {
355 return NLMSG_ALIGN(sizeof(struct ndmsg))
356 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
357 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
358 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
359 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
360 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
361 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
362 + nla_total_size(sizeof(struct nda_cacheinfo));
363 }
364
__vxlan_fdb_notify(struct vxlan_dev * vxlan,struct vxlan_fdb * fdb,struct vxlan_rdst * rd,int type)365 static void __vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
366 struct vxlan_rdst *rd, int type)
367 {
368 struct net *net = dev_net(vxlan->dev);
369 struct sk_buff *skb;
370 int err = -ENOBUFS;
371
372 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
373 if (skb == NULL)
374 goto errout;
375
376 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
377 if (err < 0) {
378 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
379 WARN_ON(err == -EMSGSIZE);
380 kfree_skb(skb);
381 goto errout;
382 }
383
384 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
385 return;
386 errout:
387 if (err < 0)
388 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
389 }
390
vxlan_fdb_switchdev_notifier_info(const struct vxlan_dev * vxlan,const struct vxlan_fdb * fdb,const struct vxlan_rdst * rd,struct netlink_ext_ack * extack,struct switchdev_notifier_vxlan_fdb_info * fdb_info)391 static void vxlan_fdb_switchdev_notifier_info(const struct vxlan_dev *vxlan,
392 const struct vxlan_fdb *fdb,
393 const struct vxlan_rdst *rd,
394 struct netlink_ext_ack *extack,
395 struct switchdev_notifier_vxlan_fdb_info *fdb_info)
396 {
397 fdb_info->info.dev = vxlan->dev;
398 fdb_info->info.extack = extack;
399 fdb_info->remote_ip = rd->remote_ip;
400 fdb_info->remote_port = rd->remote_port;
401 fdb_info->remote_vni = rd->remote_vni;
402 fdb_info->remote_ifindex = rd->remote_ifindex;
403 memcpy(fdb_info->eth_addr, fdb->eth_addr, ETH_ALEN);
404 fdb_info->vni = fdb->vni;
405 fdb_info->offloaded = rd->offloaded;
406 fdb_info->added_by_user = fdb->flags & NTF_VXLAN_ADDED_BY_USER;
407 }
408
vxlan_fdb_switchdev_call_notifiers(struct vxlan_dev * vxlan,struct vxlan_fdb * fdb,struct vxlan_rdst * rd,bool adding,struct netlink_ext_ack * extack)409 static int vxlan_fdb_switchdev_call_notifiers(struct vxlan_dev *vxlan,
410 struct vxlan_fdb *fdb,
411 struct vxlan_rdst *rd,
412 bool adding,
413 struct netlink_ext_ack *extack)
414 {
415 struct switchdev_notifier_vxlan_fdb_info info;
416 enum switchdev_notifier_type notifier_type;
417 int ret;
418
419 if (WARN_ON(!rd))
420 return 0;
421
422 notifier_type = adding ? SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE
423 : SWITCHDEV_VXLAN_FDB_DEL_TO_DEVICE;
424 vxlan_fdb_switchdev_notifier_info(vxlan, fdb, rd, NULL, &info);
425 ret = call_switchdev_notifiers(notifier_type, vxlan->dev,
426 &info.info, extack);
427 return notifier_to_errno(ret);
428 }
429
vxlan_fdb_notify(struct vxlan_dev * vxlan,struct vxlan_fdb * fdb,struct vxlan_rdst * rd,int type,bool swdev_notify,struct netlink_ext_ack * extack)430 static int vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
431 struct vxlan_rdst *rd, int type, bool swdev_notify,
432 struct netlink_ext_ack *extack)
433 {
434 int err;
435
436 if (swdev_notify && rd) {
437 switch (type) {
438 case RTM_NEWNEIGH:
439 err = vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd,
440 true, extack);
441 if (err)
442 return err;
443 break;
444 case RTM_DELNEIGH:
445 vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd,
446 false, extack);
447 break;
448 }
449 }
450
451 __vxlan_fdb_notify(vxlan, fdb, rd, type);
452 return 0;
453 }
454
vxlan_ip_miss(struct net_device * dev,union vxlan_addr * ipa)455 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
456 {
457 struct vxlan_dev *vxlan = netdev_priv(dev);
458 struct vxlan_fdb f = {
459 .state = NUD_STALE,
460 };
461 struct vxlan_rdst remote = {
462 .remote_ip = *ipa, /* goes to NDA_DST */
463 .remote_vni = cpu_to_be32(VXLAN_N_VID),
464 };
465
466 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL);
467 }
468
vxlan_fdb_miss(struct vxlan_dev * vxlan,const u8 eth_addr[ETH_ALEN])469 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
470 {
471 struct vxlan_fdb f = {
472 .state = NUD_STALE,
473 };
474 struct vxlan_rdst remote = { };
475
476 memcpy(f.eth_addr, eth_addr, ETH_ALEN);
477
478 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL);
479 }
480
481 /* Hash Ethernet address */
eth_hash(const unsigned char * addr)482 static u32 eth_hash(const unsigned char *addr)
483 {
484 u64 value = get_unaligned((u64 *)addr);
485
486 /* only want 6 bytes */
487 #ifdef __BIG_ENDIAN
488 value >>= 16;
489 #else
490 value <<= 16;
491 #endif
492 return hash_64(value, FDB_HASH_BITS);
493 }
494
eth_vni_hash(const unsigned char * addr,__be32 vni)495 static u32 eth_vni_hash(const unsigned char *addr, __be32 vni)
496 {
497 /* use 1 byte of OUI and 3 bytes of NIC */
498 u32 key = get_unaligned((u32 *)(addr + 2));
499
500 return jhash_2words(key, vni, vxlan_salt) & (FDB_HASH_SIZE - 1);
501 }
502
fdb_head_index(struct vxlan_dev * vxlan,const u8 * mac,__be32 vni)503 static u32 fdb_head_index(struct vxlan_dev *vxlan, const u8 *mac, __be32 vni)
504 {
505 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)
506 return eth_vni_hash(mac, vni);
507 else
508 return eth_hash(mac);
509 }
510
511 /* Hash chain to use given mac address */
vxlan_fdb_head(struct vxlan_dev * vxlan,const u8 * mac,__be32 vni)512 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
513 const u8 *mac, __be32 vni)
514 {
515 return &vxlan->fdb_head[fdb_head_index(vxlan, mac, vni)];
516 }
517
518 /* Look up Ethernet address in forwarding table */
__vxlan_find_mac(struct vxlan_dev * vxlan,const u8 * mac,__be32 vni)519 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
520 const u8 *mac, __be32 vni)
521 {
522 struct hlist_head *head = vxlan_fdb_head(vxlan, mac, vni);
523 struct vxlan_fdb *f;
524
525 hlist_for_each_entry_rcu(f, head, hlist) {
526 if (ether_addr_equal(mac, f->eth_addr)) {
527 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
528 if (vni == f->vni)
529 return f;
530 } else {
531 return f;
532 }
533 }
534 }
535
536 return NULL;
537 }
538
vxlan_find_mac(struct vxlan_dev * vxlan,const u8 * mac,__be32 vni)539 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
540 const u8 *mac, __be32 vni)
541 {
542 struct vxlan_fdb *f;
543
544 f = __vxlan_find_mac(vxlan, mac, vni);
545 if (f && f->used != jiffies)
546 f->used = jiffies;
547
548 return f;
549 }
550
551 /* caller should hold vxlan->hash_lock */
vxlan_fdb_find_rdst(struct vxlan_fdb * f,union vxlan_addr * ip,__be16 port,__be32 vni,__u32 ifindex)552 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
553 union vxlan_addr *ip, __be16 port,
554 __be32 vni, __u32 ifindex)
555 {
556 struct vxlan_rdst *rd;
557
558 list_for_each_entry(rd, &f->remotes, list) {
559 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
560 rd->remote_port == port &&
561 rd->remote_vni == vni &&
562 rd->remote_ifindex == ifindex)
563 return rd;
564 }
565
566 return NULL;
567 }
568
vxlan_fdb_find_uc(struct net_device * dev,const u8 * mac,__be32 vni,struct switchdev_notifier_vxlan_fdb_info * fdb_info)569 int vxlan_fdb_find_uc(struct net_device *dev, const u8 *mac, __be32 vni,
570 struct switchdev_notifier_vxlan_fdb_info *fdb_info)
571 {
572 struct vxlan_dev *vxlan = netdev_priv(dev);
573 u8 eth_addr[ETH_ALEN + 2] = { 0 };
574 struct vxlan_rdst *rdst;
575 struct vxlan_fdb *f;
576 int rc = 0;
577
578 if (is_multicast_ether_addr(mac) ||
579 is_zero_ether_addr(mac))
580 return -EINVAL;
581
582 ether_addr_copy(eth_addr, mac);
583
584 rcu_read_lock();
585
586 f = __vxlan_find_mac(vxlan, eth_addr, vni);
587 if (!f) {
588 rc = -ENOENT;
589 goto out;
590 }
591
592 rdst = first_remote_rcu(f);
593 vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, NULL, fdb_info);
594
595 out:
596 rcu_read_unlock();
597 return rc;
598 }
599 EXPORT_SYMBOL_GPL(vxlan_fdb_find_uc);
600
vxlan_fdb_notify_one(struct notifier_block * nb,const struct vxlan_dev * vxlan,const struct vxlan_fdb * f,const struct vxlan_rdst * rdst,struct netlink_ext_ack * extack)601 static int vxlan_fdb_notify_one(struct notifier_block *nb,
602 const struct vxlan_dev *vxlan,
603 const struct vxlan_fdb *f,
604 const struct vxlan_rdst *rdst,
605 struct netlink_ext_ack *extack)
606 {
607 struct switchdev_notifier_vxlan_fdb_info fdb_info;
608 int rc;
609
610 vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, extack, &fdb_info);
611 rc = nb->notifier_call(nb, SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE,
612 &fdb_info);
613 return notifier_to_errno(rc);
614 }
615
vxlan_fdb_replay(const struct net_device * dev,__be32 vni,struct notifier_block * nb,struct netlink_ext_ack * extack)616 int vxlan_fdb_replay(const struct net_device *dev, __be32 vni,
617 struct notifier_block *nb,
618 struct netlink_ext_ack *extack)
619 {
620 struct vxlan_dev *vxlan;
621 struct vxlan_rdst *rdst;
622 struct vxlan_fdb *f;
623 unsigned int h;
624 int rc = 0;
625
626 if (!netif_is_vxlan(dev))
627 return -EINVAL;
628 vxlan = netdev_priv(dev);
629
630 for (h = 0; h < FDB_HASH_SIZE; ++h) {
631 spin_lock_bh(&vxlan->hash_lock[h]);
632 hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist) {
633 if (f->vni == vni) {
634 list_for_each_entry(rdst, &f->remotes, list) {
635 rc = vxlan_fdb_notify_one(nb, vxlan,
636 f, rdst,
637 extack);
638 if (rc)
639 goto unlock;
640 }
641 }
642 }
643 spin_unlock_bh(&vxlan->hash_lock[h]);
644 }
645 return 0;
646
647 unlock:
648 spin_unlock_bh(&vxlan->hash_lock[h]);
649 return rc;
650 }
651 EXPORT_SYMBOL_GPL(vxlan_fdb_replay);
652
vxlan_fdb_clear_offload(const struct net_device * dev,__be32 vni)653 void vxlan_fdb_clear_offload(const struct net_device *dev, __be32 vni)
654 {
655 struct vxlan_dev *vxlan;
656 struct vxlan_rdst *rdst;
657 struct vxlan_fdb *f;
658 unsigned int h;
659
660 if (!netif_is_vxlan(dev))
661 return;
662 vxlan = netdev_priv(dev);
663
664 for (h = 0; h < FDB_HASH_SIZE; ++h) {
665 spin_lock_bh(&vxlan->hash_lock[h]);
666 hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist)
667 if (f->vni == vni)
668 list_for_each_entry(rdst, &f->remotes, list)
669 rdst->offloaded = false;
670 spin_unlock_bh(&vxlan->hash_lock[h]);
671 }
672
673 }
674 EXPORT_SYMBOL_GPL(vxlan_fdb_clear_offload);
675
676 /* Replace destination of unicast mac */
vxlan_fdb_replace(struct vxlan_fdb * f,union vxlan_addr * ip,__be16 port,__be32 vni,__u32 ifindex,struct vxlan_rdst * oldrd)677 static int vxlan_fdb_replace(struct vxlan_fdb *f,
678 union vxlan_addr *ip, __be16 port, __be32 vni,
679 __u32 ifindex, struct vxlan_rdst *oldrd)
680 {
681 struct vxlan_rdst *rd;
682
683 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
684 if (rd)
685 return 0;
686
687 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
688 if (!rd)
689 return 0;
690
691 *oldrd = *rd;
692 dst_cache_reset(&rd->dst_cache);
693 rd->remote_ip = *ip;
694 rd->remote_port = port;
695 rd->remote_vni = vni;
696 rd->remote_ifindex = ifindex;
697 rd->offloaded = false;
698 return 1;
699 }
700
701 /* Add/update destinations for multicast */
vxlan_fdb_append(struct vxlan_fdb * f,union vxlan_addr * ip,__be16 port,__be32 vni,__u32 ifindex,struct vxlan_rdst ** rdp)702 static int vxlan_fdb_append(struct vxlan_fdb *f,
703 union vxlan_addr *ip, __be16 port, __be32 vni,
704 __u32 ifindex, struct vxlan_rdst **rdp)
705 {
706 struct vxlan_rdst *rd;
707
708 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
709 if (rd)
710 return 0;
711
712 rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
713 if (rd == NULL)
714 return -ENOBUFS;
715
716 if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) {
717 kfree(rd);
718 return -ENOBUFS;
719 }
720
721 rd->remote_ip = *ip;
722 rd->remote_port = port;
723 rd->offloaded = false;
724 rd->remote_vni = vni;
725 rd->remote_ifindex = ifindex;
726
727 list_add_tail_rcu(&rd->list, &f->remotes);
728
729 *rdp = rd;
730 return 1;
731 }
732
vxlan_gro_remcsum(struct sk_buff * skb,unsigned int off,struct vxlanhdr * vh,size_t hdrlen,__be32 vni_field,struct gro_remcsum * grc,bool nopartial)733 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
734 unsigned int off,
735 struct vxlanhdr *vh, size_t hdrlen,
736 __be32 vni_field,
737 struct gro_remcsum *grc,
738 bool nopartial)
739 {
740 size_t start, offset;
741
742 if (skb->remcsum_offload)
743 return vh;
744
745 if (!NAPI_GRO_CB(skb)->csum_valid)
746 return NULL;
747
748 start = vxlan_rco_start(vni_field);
749 offset = start + vxlan_rco_offset(vni_field);
750
751 vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
752 start, offset, grc, nopartial);
753
754 skb->remcsum_offload = 1;
755
756 return vh;
757 }
758
vxlan_gro_receive(struct sock * sk,struct list_head * head,struct sk_buff * skb)759 static struct sk_buff *vxlan_gro_receive(struct sock *sk,
760 struct list_head *head,
761 struct sk_buff *skb)
762 {
763 struct sk_buff *pp = NULL;
764 struct sk_buff *p;
765 struct vxlanhdr *vh, *vh2;
766 unsigned int hlen, off_vx;
767 int flush = 1;
768 struct vxlan_sock *vs = rcu_dereference_sk_user_data(sk);
769 __be32 flags;
770 struct gro_remcsum grc;
771
772 skb_gro_remcsum_init(&grc);
773
774 off_vx = skb_gro_offset(skb);
775 hlen = off_vx + sizeof(*vh);
776 vh = skb_gro_header_fast(skb, off_vx);
777 if (skb_gro_header_hard(skb, hlen)) {
778 vh = skb_gro_header_slow(skb, hlen, off_vx);
779 if (unlikely(!vh))
780 goto out;
781 }
782
783 skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
784
785 flags = vh->vx_flags;
786
787 if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
788 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
789 vh->vx_vni, &grc,
790 !!(vs->flags &
791 VXLAN_F_REMCSUM_NOPARTIAL));
792
793 if (!vh)
794 goto out;
795 }
796
797 skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
798
799 list_for_each_entry(p, head, list) {
800 if (!NAPI_GRO_CB(p)->same_flow)
801 continue;
802
803 vh2 = (struct vxlanhdr *)(p->data + off_vx);
804 if (vh->vx_flags != vh2->vx_flags ||
805 vh->vx_vni != vh2->vx_vni) {
806 NAPI_GRO_CB(p)->same_flow = 0;
807 continue;
808 }
809 }
810
811 pp = call_gro_receive(eth_gro_receive, head, skb);
812 flush = 0;
813
814 out:
815 skb_gro_flush_final_remcsum(skb, pp, flush, &grc);
816
817 return pp;
818 }
819
vxlan_gro_complete(struct sock * sk,struct sk_buff * skb,int nhoff)820 static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
821 {
822 /* Sets 'skb->inner_mac_header' since we are always called with
823 * 'skb->encapsulation' set.
824 */
825 return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
826 }
827
vxlan_fdb_alloc(struct vxlan_dev * vxlan,const u8 * mac,__u16 state,__be32 src_vni,__u16 ndm_flags)828 static struct vxlan_fdb *vxlan_fdb_alloc(struct vxlan_dev *vxlan, const u8 *mac,
829 __u16 state, __be32 src_vni,
830 __u16 ndm_flags)
831 {
832 struct vxlan_fdb *f;
833
834 f = kmalloc(sizeof(*f), GFP_ATOMIC);
835 if (!f)
836 return NULL;
837 f->state = state;
838 f->flags = ndm_flags;
839 f->updated = f->used = jiffies;
840 f->vni = src_vni;
841 f->nh = NULL;
842 RCU_INIT_POINTER(f->vdev, vxlan);
843 INIT_LIST_HEAD(&f->nh_list);
844 INIT_LIST_HEAD(&f->remotes);
845 memcpy(f->eth_addr, mac, ETH_ALEN);
846
847 return f;
848 }
849
vxlan_fdb_insert(struct vxlan_dev * vxlan,const u8 * mac,__be32 src_vni,struct vxlan_fdb * f)850 static void vxlan_fdb_insert(struct vxlan_dev *vxlan, const u8 *mac,
851 __be32 src_vni, struct vxlan_fdb *f)
852 {
853 ++vxlan->addrcnt;
854 hlist_add_head_rcu(&f->hlist,
855 vxlan_fdb_head(vxlan, mac, src_vni));
856 }
857
vxlan_fdb_nh_update(struct vxlan_dev * vxlan,struct vxlan_fdb * fdb,u32 nhid,struct netlink_ext_ack * extack)858 static int vxlan_fdb_nh_update(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
859 u32 nhid, struct netlink_ext_ack *extack)
860 {
861 struct nexthop *old_nh = rtnl_dereference(fdb->nh);
862 struct nexthop *nh;
863 int err = -EINVAL;
864
865 if (old_nh && old_nh->id == nhid)
866 return 0;
867
868 nh = nexthop_find_by_id(vxlan->net, nhid);
869 if (!nh) {
870 NL_SET_ERR_MSG(extack, "Nexthop id does not exist");
871 goto err_inval;
872 }
873
874 if (nh) {
875 if (!nexthop_get(nh)) {
876 NL_SET_ERR_MSG(extack, "Nexthop has been deleted");
877 nh = NULL;
878 goto err_inval;
879 }
880 if (!nexthop_is_fdb(nh)) {
881 NL_SET_ERR_MSG(extack, "Nexthop is not a fdb nexthop");
882 goto err_inval;
883 }
884
885 if (!nexthop_is_multipath(nh)) {
886 NL_SET_ERR_MSG(extack, "Nexthop is not a multipath group");
887 goto err_inval;
888 }
889
890 /* check nexthop group family */
891 switch (vxlan->default_dst.remote_ip.sa.sa_family) {
892 case AF_INET:
893 if (!nexthop_has_v4(nh)) {
894 err = -EAFNOSUPPORT;
895 NL_SET_ERR_MSG(extack, "Nexthop group family not supported");
896 goto err_inval;
897 }
898 break;
899 case AF_INET6:
900 if (nexthop_has_v4(nh)) {
901 err = -EAFNOSUPPORT;
902 NL_SET_ERR_MSG(extack, "Nexthop group family not supported");
903 goto err_inval;
904 }
905 }
906 }
907
908 if (old_nh) {
909 list_del_rcu(&fdb->nh_list);
910 nexthop_put(old_nh);
911 }
912 rcu_assign_pointer(fdb->nh, nh);
913 list_add_tail_rcu(&fdb->nh_list, &nh->fdb_list);
914 return 1;
915
916 err_inval:
917 if (nh)
918 nexthop_put(nh);
919 return err;
920 }
921
vxlan_fdb_create(struct vxlan_dev * vxlan,const u8 * mac,union vxlan_addr * ip,__u16 state,__be16 port,__be32 src_vni,__be32 vni,__u32 ifindex,__u16 ndm_flags,u32 nhid,struct vxlan_fdb ** fdb,struct netlink_ext_ack * extack)922 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
923 const u8 *mac, union vxlan_addr *ip,
924 __u16 state, __be16 port, __be32 src_vni,
925 __be32 vni, __u32 ifindex, __u16 ndm_flags,
926 u32 nhid, struct vxlan_fdb **fdb,
927 struct netlink_ext_ack *extack)
928 {
929 struct vxlan_rdst *rd = NULL;
930 struct vxlan_fdb *f;
931 int rc;
932
933 if (vxlan->cfg.addrmax &&
934 vxlan->addrcnt >= vxlan->cfg.addrmax)
935 return -ENOSPC;
936
937 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
938 f = vxlan_fdb_alloc(vxlan, mac, state, src_vni, ndm_flags);
939 if (!f)
940 return -ENOMEM;
941
942 if (nhid)
943 rc = vxlan_fdb_nh_update(vxlan, f, nhid, extack);
944 else
945 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
946 if (rc < 0)
947 goto errout;
948
949 *fdb = f;
950
951 return 0;
952
953 errout:
954 kfree(f);
955 return rc;
956 }
957
__vxlan_fdb_free(struct vxlan_fdb * f)958 static void __vxlan_fdb_free(struct vxlan_fdb *f)
959 {
960 struct vxlan_rdst *rd, *nd;
961 struct nexthop *nh;
962
963 nh = rcu_dereference_raw(f->nh);
964 if (nh) {
965 rcu_assign_pointer(f->nh, NULL);
966 rcu_assign_pointer(f->vdev, NULL);
967 nexthop_put(nh);
968 }
969
970 list_for_each_entry_safe(rd, nd, &f->remotes, list) {
971 dst_cache_destroy(&rd->dst_cache);
972 kfree(rd);
973 }
974 kfree(f);
975 }
976
vxlan_fdb_free(struct rcu_head * head)977 static void vxlan_fdb_free(struct rcu_head *head)
978 {
979 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
980
981 __vxlan_fdb_free(f);
982 }
983
vxlan_fdb_destroy(struct vxlan_dev * vxlan,struct vxlan_fdb * f,bool do_notify,bool swdev_notify)984 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
985 bool do_notify, bool swdev_notify)
986 {
987 struct vxlan_rdst *rd;
988
989 netdev_dbg(vxlan->dev, "delete %pM\n", f->eth_addr);
990
991 --vxlan->addrcnt;
992 if (do_notify) {
993 if (rcu_access_pointer(f->nh))
994 vxlan_fdb_notify(vxlan, f, NULL, RTM_DELNEIGH,
995 swdev_notify, NULL);
996 else
997 list_for_each_entry(rd, &f->remotes, list)
998 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH,
999 swdev_notify, NULL);
1000 }
1001
1002 hlist_del_rcu(&f->hlist);
1003 list_del_rcu(&f->nh_list);
1004 call_rcu(&f->rcu, vxlan_fdb_free);
1005 }
1006
vxlan_dst_free(struct rcu_head * head)1007 static void vxlan_dst_free(struct rcu_head *head)
1008 {
1009 struct vxlan_rdst *rd = container_of(head, struct vxlan_rdst, rcu);
1010
1011 dst_cache_destroy(&rd->dst_cache);
1012 kfree(rd);
1013 }
1014
vxlan_fdb_update_existing(struct vxlan_dev * vxlan,union vxlan_addr * ip,__u16 state,__u16 flags,__be16 port,__be32 vni,__u32 ifindex,__u16 ndm_flags,struct vxlan_fdb * f,u32 nhid,bool swdev_notify,struct netlink_ext_ack * extack)1015 static int vxlan_fdb_update_existing(struct vxlan_dev *vxlan,
1016 union vxlan_addr *ip,
1017 __u16 state, __u16 flags,
1018 __be16 port, __be32 vni,
1019 __u32 ifindex, __u16 ndm_flags,
1020 struct vxlan_fdb *f, u32 nhid,
1021 bool swdev_notify,
1022 struct netlink_ext_ack *extack)
1023 {
1024 __u16 fdb_flags = (ndm_flags & ~NTF_USE);
1025 struct vxlan_rdst *rd = NULL;
1026 struct vxlan_rdst oldrd;
1027 int notify = 0;
1028 int rc = 0;
1029 int err;
1030
1031 if (nhid && !rcu_access_pointer(f->nh)) {
1032 NL_SET_ERR_MSG(extack,
1033 "Cannot replace an existing non nexthop fdb with a nexthop");
1034 return -EOPNOTSUPP;
1035 }
1036
1037 if (nhid && (flags & NLM_F_APPEND)) {
1038 NL_SET_ERR_MSG(extack,
1039 "Cannot append to a nexthop fdb");
1040 return -EOPNOTSUPP;
1041 }
1042
1043 /* Do not allow an externally learned entry to take over an entry added
1044 * by the user.
1045 */
1046 if (!(fdb_flags & NTF_EXT_LEARNED) ||
1047 !(f->flags & NTF_VXLAN_ADDED_BY_USER)) {
1048 if (f->state != state) {
1049 f->state = state;
1050 f->updated = jiffies;
1051 notify = 1;
1052 }
1053 if (f->flags != fdb_flags) {
1054 f->flags = fdb_flags;
1055 f->updated = jiffies;
1056 notify = 1;
1057 }
1058 }
1059
1060 if ((flags & NLM_F_REPLACE)) {
1061 /* Only change unicasts */
1062 if (!(is_multicast_ether_addr(f->eth_addr) ||
1063 is_zero_ether_addr(f->eth_addr))) {
1064 if (nhid) {
1065 rc = vxlan_fdb_nh_update(vxlan, f, nhid, extack);
1066 if (rc < 0)
1067 return rc;
1068 } else {
1069 rc = vxlan_fdb_replace(f, ip, port, vni,
1070 ifindex, &oldrd);
1071 }
1072 notify |= rc;
1073 } else {
1074 NL_SET_ERR_MSG(extack, "Cannot replace non-unicast fdb entries");
1075 return -EOPNOTSUPP;
1076 }
1077 }
1078 if ((flags & NLM_F_APPEND) &&
1079 (is_multicast_ether_addr(f->eth_addr) ||
1080 is_zero_ether_addr(f->eth_addr))) {
1081 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
1082
1083 if (rc < 0)
1084 return rc;
1085 notify |= rc;
1086 }
1087
1088 if (ndm_flags & NTF_USE)
1089 f->used = jiffies;
1090
1091 if (notify) {
1092 if (rd == NULL)
1093 rd = first_remote_rtnl(f);
1094
1095 err = vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH,
1096 swdev_notify, extack);
1097 if (err)
1098 goto err_notify;
1099 }
1100
1101 return 0;
1102
1103 err_notify:
1104 if (nhid)
1105 return err;
1106 if ((flags & NLM_F_REPLACE) && rc)
1107 *rd = oldrd;
1108 else if ((flags & NLM_F_APPEND) && rc) {
1109 list_del_rcu(&rd->list);
1110 call_rcu(&rd->rcu, vxlan_dst_free);
1111 }
1112 return err;
1113 }
1114
vxlan_fdb_update_create(struct vxlan_dev * vxlan,const u8 * mac,union vxlan_addr * ip,__u16 state,__u16 flags,__be16 port,__be32 src_vni,__be32 vni,__u32 ifindex,__u16 ndm_flags,u32 nhid,bool swdev_notify,struct netlink_ext_ack * extack)1115 static int vxlan_fdb_update_create(struct vxlan_dev *vxlan,
1116 const u8 *mac, union vxlan_addr *ip,
1117 __u16 state, __u16 flags,
1118 __be16 port, __be32 src_vni, __be32 vni,
1119 __u32 ifindex, __u16 ndm_flags, u32 nhid,
1120 bool swdev_notify,
1121 struct netlink_ext_ack *extack)
1122 {
1123 __u16 fdb_flags = (ndm_flags & ~NTF_USE);
1124 struct vxlan_fdb *f;
1125 int rc;
1126
1127 /* Disallow replace to add a multicast entry */
1128 if ((flags & NLM_F_REPLACE) &&
1129 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
1130 return -EOPNOTSUPP;
1131
1132 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
1133 rc = vxlan_fdb_create(vxlan, mac, ip, state, port, src_vni,
1134 vni, ifindex, fdb_flags, nhid, &f, extack);
1135 if (rc < 0)
1136 return rc;
1137
1138 vxlan_fdb_insert(vxlan, mac, src_vni, f);
1139 rc = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_NEWNEIGH,
1140 swdev_notify, extack);
1141 if (rc)
1142 goto err_notify;
1143
1144 return 0;
1145
1146 err_notify:
1147 vxlan_fdb_destroy(vxlan, f, false, false);
1148 return rc;
1149 }
1150
1151 /* Add new entry to forwarding table -- assumes lock held */
vxlan_fdb_update(struct vxlan_dev * vxlan,const u8 * mac,union vxlan_addr * ip,__u16 state,__u16 flags,__be16 port,__be32 src_vni,__be32 vni,__u32 ifindex,__u16 ndm_flags,u32 nhid,bool swdev_notify,struct netlink_ext_ack * extack)1152 static int vxlan_fdb_update(struct vxlan_dev *vxlan,
1153 const u8 *mac, union vxlan_addr *ip,
1154 __u16 state, __u16 flags,
1155 __be16 port, __be32 src_vni, __be32 vni,
1156 __u32 ifindex, __u16 ndm_flags, u32 nhid,
1157 bool swdev_notify,
1158 struct netlink_ext_ack *extack)
1159 {
1160 struct vxlan_fdb *f;
1161
1162 f = __vxlan_find_mac(vxlan, mac, src_vni);
1163 if (f) {
1164 if (flags & NLM_F_EXCL) {
1165 netdev_dbg(vxlan->dev,
1166 "lost race to create %pM\n", mac);
1167 return -EEXIST;
1168 }
1169
1170 return vxlan_fdb_update_existing(vxlan, ip, state, flags, port,
1171 vni, ifindex, ndm_flags, f,
1172 nhid, swdev_notify, extack);
1173 } else {
1174 if (!(flags & NLM_F_CREATE))
1175 return -ENOENT;
1176
1177 return vxlan_fdb_update_create(vxlan, mac, ip, state, flags,
1178 port, src_vni, vni, ifindex,
1179 ndm_flags, nhid, swdev_notify,
1180 extack);
1181 }
1182 }
1183
vxlan_fdb_dst_destroy(struct vxlan_dev * vxlan,struct vxlan_fdb * f,struct vxlan_rdst * rd,bool swdev_notify)1184 static void vxlan_fdb_dst_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
1185 struct vxlan_rdst *rd, bool swdev_notify)
1186 {
1187 list_del_rcu(&rd->list);
1188 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH, swdev_notify, NULL);
1189 call_rcu(&rd->rcu, vxlan_dst_free);
1190 }
1191
vxlan_fdb_parse(struct nlattr * tb[],struct vxlan_dev * vxlan,union vxlan_addr * ip,__be16 * port,__be32 * src_vni,__be32 * vni,u32 * ifindex,u32 * nhid)1192 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
1193 union vxlan_addr *ip, __be16 *port, __be32 *src_vni,
1194 __be32 *vni, u32 *ifindex, u32 *nhid)
1195 {
1196 struct net *net = dev_net(vxlan->dev);
1197 int err;
1198
1199 if (tb[NDA_NH_ID] && (tb[NDA_DST] || tb[NDA_VNI] || tb[NDA_IFINDEX] ||
1200 tb[NDA_PORT]))
1201 return -EINVAL;
1202
1203 if (tb[NDA_DST]) {
1204 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
1205 if (err)
1206 return err;
1207 } else {
1208 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
1209
1210 if (remote->sa.sa_family == AF_INET) {
1211 ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
1212 ip->sa.sa_family = AF_INET;
1213 #if IS_ENABLED(CONFIG_IPV6)
1214 } else {
1215 ip->sin6.sin6_addr = in6addr_any;
1216 ip->sa.sa_family = AF_INET6;
1217 #endif
1218 }
1219 }
1220
1221 if (tb[NDA_PORT]) {
1222 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
1223 return -EINVAL;
1224 *port = nla_get_be16(tb[NDA_PORT]);
1225 } else {
1226 *port = vxlan->cfg.dst_port;
1227 }
1228
1229 if (tb[NDA_VNI]) {
1230 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
1231 return -EINVAL;
1232 *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
1233 } else {
1234 *vni = vxlan->default_dst.remote_vni;
1235 }
1236
1237 if (tb[NDA_SRC_VNI]) {
1238 if (nla_len(tb[NDA_SRC_VNI]) != sizeof(u32))
1239 return -EINVAL;
1240 *src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI]));
1241 } else {
1242 *src_vni = vxlan->default_dst.remote_vni;
1243 }
1244
1245 if (tb[NDA_IFINDEX]) {
1246 struct net_device *tdev;
1247
1248 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
1249 return -EINVAL;
1250 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
1251 tdev = __dev_get_by_index(net, *ifindex);
1252 if (!tdev)
1253 return -EADDRNOTAVAIL;
1254 } else {
1255 *ifindex = 0;
1256 }
1257
1258 if (tb[NDA_NH_ID])
1259 *nhid = nla_get_u32(tb[NDA_NH_ID]);
1260 else
1261 *nhid = 0;
1262
1263 return 0;
1264 }
1265
1266 /* Add static entry (via netlink) */
vxlan_fdb_add(struct ndmsg * ndm,struct nlattr * tb[],struct net_device * dev,const unsigned char * addr,u16 vid,u16 flags,struct netlink_ext_ack * extack)1267 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
1268 struct net_device *dev,
1269 const unsigned char *addr, u16 vid, u16 flags,
1270 struct netlink_ext_ack *extack)
1271 {
1272 struct vxlan_dev *vxlan = netdev_priv(dev);
1273 /* struct net *net = dev_net(vxlan->dev); */
1274 union vxlan_addr ip;
1275 __be16 port;
1276 __be32 src_vni, vni;
1277 u32 ifindex, nhid;
1278 u32 hash_index;
1279 int err;
1280
1281 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
1282 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
1283 ndm->ndm_state);
1284 return -EINVAL;
1285 }
1286
1287 if (!tb || (!tb[NDA_DST] && !tb[NDA_NH_ID]))
1288 return -EINVAL;
1289
1290 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex,
1291 &nhid);
1292 if (err)
1293 return err;
1294
1295 if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
1296 return -EAFNOSUPPORT;
1297
1298 hash_index = fdb_head_index(vxlan, addr, src_vni);
1299 spin_lock_bh(&vxlan->hash_lock[hash_index]);
1300 err = vxlan_fdb_update(vxlan, addr, &ip, ndm->ndm_state, flags,
1301 port, src_vni, vni, ifindex,
1302 ndm->ndm_flags | NTF_VXLAN_ADDED_BY_USER,
1303 nhid, true, extack);
1304 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
1305
1306 return err;
1307 }
1308
__vxlan_fdb_delete(struct vxlan_dev * vxlan,const unsigned char * addr,union vxlan_addr ip,__be16 port,__be32 src_vni,__be32 vni,u32 ifindex,bool swdev_notify)1309 static int __vxlan_fdb_delete(struct vxlan_dev *vxlan,
1310 const unsigned char *addr, union vxlan_addr ip,
1311 __be16 port, __be32 src_vni, __be32 vni,
1312 u32 ifindex, bool swdev_notify)
1313 {
1314 struct vxlan_rdst *rd = NULL;
1315 struct vxlan_fdb *f;
1316 int err = -ENOENT;
1317
1318 f = vxlan_find_mac(vxlan, addr, src_vni);
1319 if (!f)
1320 return err;
1321
1322 if (!vxlan_addr_any(&ip)) {
1323 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
1324 if (!rd)
1325 goto out;
1326 }
1327
1328 /* remove a destination if it's not the only one on the list,
1329 * otherwise destroy the fdb entry
1330 */
1331 if (rd && !list_is_singular(&f->remotes)) {
1332 vxlan_fdb_dst_destroy(vxlan, f, rd, swdev_notify);
1333 goto out;
1334 }
1335
1336 vxlan_fdb_destroy(vxlan, f, true, swdev_notify);
1337
1338 out:
1339 return 0;
1340 }
1341
1342 /* Delete entry (via netlink) */
vxlan_fdb_delete(struct ndmsg * ndm,struct nlattr * tb[],struct net_device * dev,const unsigned char * addr,u16 vid)1343 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
1344 struct net_device *dev,
1345 const unsigned char *addr, u16 vid)
1346 {
1347 struct vxlan_dev *vxlan = netdev_priv(dev);
1348 union vxlan_addr ip;
1349 __be32 src_vni, vni;
1350 u32 ifindex, nhid;
1351 u32 hash_index;
1352 __be16 port;
1353 int err;
1354
1355 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex,
1356 &nhid);
1357 if (err)
1358 return err;
1359
1360 hash_index = fdb_head_index(vxlan, addr, src_vni);
1361 spin_lock_bh(&vxlan->hash_lock[hash_index]);
1362 err = __vxlan_fdb_delete(vxlan, addr, ip, port, src_vni, vni, ifindex,
1363 true);
1364 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
1365
1366 return err;
1367 }
1368
1369 /* Dump forwarding table */
vxlan_fdb_dump(struct sk_buff * skb,struct netlink_callback * cb,struct net_device * dev,struct net_device * filter_dev,int * idx)1370 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
1371 struct net_device *dev,
1372 struct net_device *filter_dev, int *idx)
1373 {
1374 struct vxlan_dev *vxlan = netdev_priv(dev);
1375 unsigned int h;
1376 int err = 0;
1377
1378 for (h = 0; h < FDB_HASH_SIZE; ++h) {
1379 struct vxlan_fdb *f;
1380
1381 rcu_read_lock();
1382 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
1383 struct vxlan_rdst *rd;
1384
1385 if (rcu_access_pointer(f->nh)) {
1386 if (*idx < cb->args[2])
1387 goto skip_nh;
1388 err = vxlan_fdb_info(skb, vxlan, f,
1389 NETLINK_CB(cb->skb).portid,
1390 cb->nlh->nlmsg_seq,
1391 RTM_NEWNEIGH,
1392 NLM_F_MULTI, NULL);
1393 if (err < 0) {
1394 rcu_read_unlock();
1395 goto out;
1396 }
1397 skip_nh:
1398 *idx += 1;
1399 continue;
1400 }
1401
1402 list_for_each_entry_rcu(rd, &f->remotes, list) {
1403 if (*idx < cb->args[2])
1404 goto skip;
1405
1406 err = vxlan_fdb_info(skb, vxlan, f,
1407 NETLINK_CB(cb->skb).portid,
1408 cb->nlh->nlmsg_seq,
1409 RTM_NEWNEIGH,
1410 NLM_F_MULTI, rd);
1411 if (err < 0) {
1412 rcu_read_unlock();
1413 goto out;
1414 }
1415 skip:
1416 *idx += 1;
1417 }
1418 }
1419 rcu_read_unlock();
1420 }
1421 out:
1422 return err;
1423 }
1424
vxlan_fdb_get(struct sk_buff * skb,struct nlattr * tb[],struct net_device * dev,const unsigned char * addr,u16 vid,u32 portid,u32 seq,struct netlink_ext_ack * extack)1425 static int vxlan_fdb_get(struct sk_buff *skb,
1426 struct nlattr *tb[],
1427 struct net_device *dev,
1428 const unsigned char *addr,
1429 u16 vid, u32 portid, u32 seq,
1430 struct netlink_ext_ack *extack)
1431 {
1432 struct vxlan_dev *vxlan = netdev_priv(dev);
1433 struct vxlan_fdb *f;
1434 __be32 vni;
1435 int err;
1436
1437 if (tb[NDA_VNI])
1438 vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
1439 else
1440 vni = vxlan->default_dst.remote_vni;
1441
1442 rcu_read_lock();
1443
1444 f = __vxlan_find_mac(vxlan, addr, vni);
1445 if (!f) {
1446 NL_SET_ERR_MSG(extack, "Fdb entry not found");
1447 err = -ENOENT;
1448 goto errout;
1449 }
1450
1451 err = vxlan_fdb_info(skb, vxlan, f, portid, seq,
1452 RTM_NEWNEIGH, 0, first_remote_rcu(f));
1453 errout:
1454 rcu_read_unlock();
1455 return err;
1456 }
1457
1458 /* Watch incoming packets to learn mapping between Ethernet address
1459 * and Tunnel endpoint.
1460 * Return true if packet is bogus and should be dropped.
1461 */
vxlan_snoop(struct net_device * dev,union vxlan_addr * src_ip,const u8 * src_mac,u32 src_ifindex,__be32 vni)1462 static bool vxlan_snoop(struct net_device *dev,
1463 union vxlan_addr *src_ip, const u8 *src_mac,
1464 u32 src_ifindex, __be32 vni)
1465 {
1466 struct vxlan_dev *vxlan = netdev_priv(dev);
1467 struct vxlan_fdb *f;
1468 u32 ifindex = 0;
1469
1470 #if IS_ENABLED(CONFIG_IPV6)
1471 if (src_ip->sa.sa_family == AF_INET6 &&
1472 (ipv6_addr_type(&src_ip->sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL))
1473 ifindex = src_ifindex;
1474 #endif
1475
1476 f = vxlan_find_mac(vxlan, src_mac, vni);
1477 if (likely(f)) {
1478 struct vxlan_rdst *rdst = first_remote_rcu(f);
1479
1480 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip) &&
1481 rdst->remote_ifindex == ifindex))
1482 return false;
1483
1484 /* Don't migrate static entries, drop packets */
1485 if (f->state & (NUD_PERMANENT | NUD_NOARP))
1486 return true;
1487
1488 /* Don't override an fdb with nexthop with a learnt entry */
1489 if (rcu_access_pointer(f->nh))
1490 return true;
1491
1492 if (net_ratelimit())
1493 netdev_info(dev,
1494 "%pM migrated from %pIS to %pIS\n",
1495 src_mac, &rdst->remote_ip.sa, &src_ip->sa);
1496
1497 rdst->remote_ip = *src_ip;
1498 f->updated = jiffies;
1499 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH, true, NULL);
1500 } else {
1501 u32 hash_index = fdb_head_index(vxlan, src_mac, vni);
1502
1503 /* learned new entry */
1504 spin_lock(&vxlan->hash_lock[hash_index]);
1505
1506 /* close off race between vxlan_flush and incoming packets */
1507 if (netif_running(dev))
1508 vxlan_fdb_update(vxlan, src_mac, src_ip,
1509 NUD_REACHABLE,
1510 NLM_F_EXCL|NLM_F_CREATE,
1511 vxlan->cfg.dst_port,
1512 vni,
1513 vxlan->default_dst.remote_vni,
1514 ifindex, NTF_SELF, 0, true, NULL);
1515 spin_unlock(&vxlan->hash_lock[hash_index]);
1516 }
1517
1518 return false;
1519 }
1520
1521 /* See if multicast group is already in use by other ID */
vxlan_group_used(struct vxlan_net * vn,struct vxlan_dev * dev)1522 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
1523 {
1524 struct vxlan_dev *vxlan;
1525 struct vxlan_sock *sock4;
1526 #if IS_ENABLED(CONFIG_IPV6)
1527 struct vxlan_sock *sock6;
1528 #endif
1529 unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
1530
1531 sock4 = rtnl_dereference(dev->vn4_sock);
1532
1533 /* The vxlan_sock is only used by dev, leaving group has
1534 * no effect on other vxlan devices.
1535 */
1536 if (family == AF_INET && sock4 && refcount_read(&sock4->refcnt) == 1)
1537 return false;
1538 #if IS_ENABLED(CONFIG_IPV6)
1539 sock6 = rtnl_dereference(dev->vn6_sock);
1540 if (family == AF_INET6 && sock6 && refcount_read(&sock6->refcnt) == 1)
1541 return false;
1542 #endif
1543
1544 list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1545 if (!netif_running(vxlan->dev) || vxlan == dev)
1546 continue;
1547
1548 if (family == AF_INET &&
1549 rtnl_dereference(vxlan->vn4_sock) != sock4)
1550 continue;
1551 #if IS_ENABLED(CONFIG_IPV6)
1552 if (family == AF_INET6 &&
1553 rtnl_dereference(vxlan->vn6_sock) != sock6)
1554 continue;
1555 #endif
1556
1557 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1558 &dev->default_dst.remote_ip))
1559 continue;
1560
1561 if (vxlan->default_dst.remote_ifindex !=
1562 dev->default_dst.remote_ifindex)
1563 continue;
1564
1565 return true;
1566 }
1567
1568 return false;
1569 }
1570
__vxlan_sock_release_prep(struct vxlan_sock * vs)1571 static bool __vxlan_sock_release_prep(struct vxlan_sock *vs)
1572 {
1573 struct vxlan_net *vn;
1574
1575 if (!vs)
1576 return false;
1577 if (!refcount_dec_and_test(&vs->refcnt))
1578 return false;
1579
1580 vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1581 spin_lock(&vn->sock_lock);
1582 hlist_del_rcu(&vs->hlist);
1583 udp_tunnel_notify_del_rx_port(vs->sock,
1584 (vs->flags & VXLAN_F_GPE) ?
1585 UDP_TUNNEL_TYPE_VXLAN_GPE :
1586 UDP_TUNNEL_TYPE_VXLAN);
1587 spin_unlock(&vn->sock_lock);
1588
1589 return true;
1590 }
1591
vxlan_sock_release(struct vxlan_dev * vxlan)1592 static void vxlan_sock_release(struct vxlan_dev *vxlan)
1593 {
1594 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1595 #if IS_ENABLED(CONFIG_IPV6)
1596 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1597
1598 RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
1599 #endif
1600
1601 RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
1602 synchronize_net();
1603
1604 vxlan_vs_del_dev(vxlan);
1605
1606 if (__vxlan_sock_release_prep(sock4)) {
1607 udp_tunnel_sock_release(sock4->sock);
1608 kfree(sock4);
1609 }
1610
1611 #if IS_ENABLED(CONFIG_IPV6)
1612 if (__vxlan_sock_release_prep(sock6)) {
1613 udp_tunnel_sock_release(sock6->sock);
1614 kfree(sock6);
1615 }
1616 #endif
1617 }
1618
1619 /* Update multicast group membership when first VNI on
1620 * multicast address is brought up
1621 */
vxlan_igmp_join(struct vxlan_dev * vxlan)1622 static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1623 {
1624 struct sock *sk;
1625 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1626 int ifindex = vxlan->default_dst.remote_ifindex;
1627 int ret = -EINVAL;
1628
1629 if (ip->sa.sa_family == AF_INET) {
1630 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1631 struct ip_mreqn mreq = {
1632 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1633 .imr_ifindex = ifindex,
1634 };
1635
1636 sk = sock4->sock->sk;
1637 lock_sock(sk);
1638 ret = ip_mc_join_group(sk, &mreq);
1639 release_sock(sk);
1640 #if IS_ENABLED(CONFIG_IPV6)
1641 } else {
1642 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1643
1644 sk = sock6->sock->sk;
1645 lock_sock(sk);
1646 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1647 &ip->sin6.sin6_addr);
1648 release_sock(sk);
1649 #endif
1650 }
1651
1652 return ret;
1653 }
1654
1655 /* Inverse of vxlan_igmp_join when last VNI is brought down */
vxlan_igmp_leave(struct vxlan_dev * vxlan)1656 static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1657 {
1658 struct sock *sk;
1659 union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1660 int ifindex = vxlan->default_dst.remote_ifindex;
1661 int ret = -EINVAL;
1662
1663 if (ip->sa.sa_family == AF_INET) {
1664 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1665 struct ip_mreqn mreq = {
1666 .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
1667 .imr_ifindex = ifindex,
1668 };
1669
1670 sk = sock4->sock->sk;
1671 lock_sock(sk);
1672 ret = ip_mc_leave_group(sk, &mreq);
1673 release_sock(sk);
1674 #if IS_ENABLED(CONFIG_IPV6)
1675 } else {
1676 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1677
1678 sk = sock6->sock->sk;
1679 lock_sock(sk);
1680 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1681 &ip->sin6.sin6_addr);
1682 release_sock(sk);
1683 #endif
1684 }
1685
1686 return ret;
1687 }
1688
vxlan_remcsum(struct vxlanhdr * unparsed,struct sk_buff * skb,u32 vxflags)1689 static bool vxlan_remcsum(struct vxlanhdr *unparsed,
1690 struct sk_buff *skb, u32 vxflags)
1691 {
1692 size_t start, offset;
1693
1694 if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
1695 goto out;
1696
1697 start = vxlan_rco_start(unparsed->vx_vni);
1698 offset = start + vxlan_rco_offset(unparsed->vx_vni);
1699
1700 if (!pskb_may_pull(skb, offset + sizeof(u16)))
1701 return false;
1702
1703 skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
1704 !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL));
1705 out:
1706 unparsed->vx_flags &= ~VXLAN_HF_RCO;
1707 unparsed->vx_vni &= VXLAN_VNI_MASK;
1708 return true;
1709 }
1710
vxlan_parse_gbp_hdr(struct vxlanhdr * unparsed,struct sk_buff * skb,u32 vxflags,struct vxlan_metadata * md)1711 static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
1712 struct sk_buff *skb, u32 vxflags,
1713 struct vxlan_metadata *md)
1714 {
1715 struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
1716 struct metadata_dst *tun_dst;
1717
1718 if (!(unparsed->vx_flags & VXLAN_HF_GBP))
1719 goto out;
1720
1721 md->gbp = ntohs(gbp->policy_id);
1722
1723 tun_dst = (struct metadata_dst *)skb_dst(skb);
1724 if (tun_dst) {
1725 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1726 tun_dst->u.tun_info.options_len = sizeof(*md);
1727 }
1728 if (gbp->dont_learn)
1729 md->gbp |= VXLAN_GBP_DONT_LEARN;
1730
1731 if (gbp->policy_applied)
1732 md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1733
1734 /* In flow-based mode, GBP is carried in dst_metadata */
1735 if (!(vxflags & VXLAN_F_COLLECT_METADATA))
1736 skb->mark = md->gbp;
1737 out:
1738 unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
1739 }
1740
vxlan_parse_gpe_hdr(struct vxlanhdr * unparsed,__be16 * protocol,struct sk_buff * skb,u32 vxflags)1741 static bool vxlan_parse_gpe_hdr(struct vxlanhdr *unparsed,
1742 __be16 *protocol,
1743 struct sk_buff *skb, u32 vxflags)
1744 {
1745 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)unparsed;
1746
1747 /* Need to have Next Protocol set for interfaces in GPE mode. */
1748 if (!gpe->np_applied)
1749 return false;
1750 /* "The initial version is 0. If a receiver does not support the
1751 * version indicated it MUST drop the packet.
1752 */
1753 if (gpe->version != 0)
1754 return false;
1755 /* "When the O bit is set to 1, the packet is an OAM packet and OAM
1756 * processing MUST occur." However, we don't implement OAM
1757 * processing, thus drop the packet.
1758 */
1759 if (gpe->oam_flag)
1760 return false;
1761
1762 *protocol = tun_p_to_eth_p(gpe->next_protocol);
1763 if (!*protocol)
1764 return false;
1765
1766 unparsed->vx_flags &= ~VXLAN_GPE_USED_BITS;
1767 return true;
1768 }
1769
vxlan_set_mac(struct vxlan_dev * vxlan,struct vxlan_sock * vs,struct sk_buff * skb,__be32 vni)1770 static bool vxlan_set_mac(struct vxlan_dev *vxlan,
1771 struct vxlan_sock *vs,
1772 struct sk_buff *skb, __be32 vni)
1773 {
1774 union vxlan_addr saddr;
1775 u32 ifindex = skb->dev->ifindex;
1776
1777 skb_reset_mac_header(skb);
1778 skb->protocol = eth_type_trans(skb, vxlan->dev);
1779 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1780
1781 /* Ignore packet loops (and multicast echo) */
1782 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1783 return false;
1784
1785 /* Get address from the outer IP header */
1786 if (vxlan_get_sk_family(vs) == AF_INET) {
1787 saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
1788 saddr.sa.sa_family = AF_INET;
1789 #if IS_ENABLED(CONFIG_IPV6)
1790 } else {
1791 saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
1792 saddr.sa.sa_family = AF_INET6;
1793 #endif
1794 }
1795
1796 if ((vxlan->cfg.flags & VXLAN_F_LEARN) &&
1797 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source, ifindex, vni))
1798 return false;
1799
1800 return true;
1801 }
1802
vxlan_ecn_decapsulate(struct vxlan_sock * vs,void * oiph,struct sk_buff * skb)1803 static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph,
1804 struct sk_buff *skb)
1805 {
1806 int err = 0;
1807
1808 if (vxlan_get_sk_family(vs) == AF_INET)
1809 err = IP_ECN_decapsulate(oiph, skb);
1810 #if IS_ENABLED(CONFIG_IPV6)
1811 else
1812 err = IP6_ECN_decapsulate(oiph, skb);
1813 #endif
1814
1815 if (unlikely(err) && log_ecn_error) {
1816 if (vxlan_get_sk_family(vs) == AF_INET)
1817 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1818 &((struct iphdr *)oiph)->saddr,
1819 ((struct iphdr *)oiph)->tos);
1820 else
1821 net_info_ratelimited("non-ECT from %pI6\n",
1822 &((struct ipv6hdr *)oiph)->saddr);
1823 }
1824 return err <= 1;
1825 }
1826
1827 /* Callback from net/ipv4/udp.c to receive packets */
vxlan_rcv(struct sock * sk,struct sk_buff * skb)1828 static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
1829 {
1830 struct vxlan_dev *vxlan;
1831 struct vxlan_sock *vs;
1832 struct vxlanhdr unparsed;
1833 struct vxlan_metadata _md;
1834 struct vxlan_metadata *md = &_md;
1835 __be16 protocol = htons(ETH_P_TEB);
1836 bool raw_proto = false;
1837 void *oiph;
1838 __be32 vni = 0;
1839
1840 /* Need UDP and VXLAN header to be present */
1841 if (!pskb_may_pull(skb, VXLAN_HLEN))
1842 goto drop;
1843
1844 unparsed = *vxlan_hdr(skb);
1845 /* VNI flag always required to be set */
1846 if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
1847 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1848 ntohl(vxlan_hdr(skb)->vx_flags),
1849 ntohl(vxlan_hdr(skb)->vx_vni));
1850 /* Return non vxlan pkt */
1851 goto drop;
1852 }
1853 unparsed.vx_flags &= ~VXLAN_HF_VNI;
1854 unparsed.vx_vni &= ~VXLAN_VNI_MASK;
1855
1856 vs = rcu_dereference_sk_user_data(sk);
1857 if (!vs)
1858 goto drop;
1859
1860 vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
1861
1862 vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni);
1863 if (!vxlan)
1864 goto drop;
1865
1866 /* For backwards compatibility, only allow reserved fields to be
1867 * used by VXLAN extensions if explicitly requested.
1868 */
1869 if (vs->flags & VXLAN_F_GPE) {
1870 if (!vxlan_parse_gpe_hdr(&unparsed, &protocol, skb, vs->flags))
1871 goto drop;
1872 raw_proto = true;
1873 }
1874
1875 if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto,
1876 !net_eq(vxlan->net, dev_net(vxlan->dev))))
1877 goto drop;
1878
1879 if (vs->flags & VXLAN_F_REMCSUM_RX)
1880 if (unlikely(!vxlan_remcsum(&unparsed, skb, vs->flags)))
1881 goto drop;
1882
1883 if (vxlan_collect_metadata(vs)) {
1884 struct metadata_dst *tun_dst;
1885
1886 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1887 key32_to_tunnel_id(vni), sizeof(*md));
1888
1889 if (!tun_dst)
1890 goto drop;
1891
1892 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1893
1894 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1895 } else {
1896 memset(md, 0, sizeof(*md));
1897 }
1898
1899 if (vs->flags & VXLAN_F_GBP)
1900 vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md);
1901 /* Note that GBP and GPE can never be active together. This is
1902 * ensured in vxlan_dev_configure.
1903 */
1904
1905 if (unparsed.vx_flags || unparsed.vx_vni) {
1906 /* If there are any unprocessed flags remaining treat
1907 * this as a malformed packet. This behavior diverges from
1908 * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1909 * in reserved fields are to be ignored. The approach here
1910 * maintains compatibility with previous stack code, and also
1911 * is more robust and provides a little more security in
1912 * adding extensions to VXLAN.
1913 */
1914 goto drop;
1915 }
1916
1917 if (!raw_proto) {
1918 if (!vxlan_set_mac(vxlan, vs, skb, vni))
1919 goto drop;
1920 } else {
1921 skb_reset_mac_header(skb);
1922 skb->dev = vxlan->dev;
1923 skb->pkt_type = PACKET_HOST;
1924 }
1925
1926 oiph = skb_network_header(skb);
1927 skb_reset_network_header(skb);
1928
1929 if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
1930 ++vxlan->dev->stats.rx_frame_errors;
1931 ++vxlan->dev->stats.rx_errors;
1932 goto drop;
1933 }
1934
1935 rcu_read_lock();
1936
1937 if (unlikely(!(vxlan->dev->flags & IFF_UP))) {
1938 rcu_read_unlock();
1939 atomic_long_inc(&vxlan->dev->rx_dropped);
1940 goto drop;
1941 }
1942
1943 dev_sw_netstats_rx_add(vxlan->dev, skb->len);
1944 gro_cells_receive(&vxlan->gro_cells, skb);
1945
1946 rcu_read_unlock();
1947
1948 return 0;
1949
1950 drop:
1951 /* Consume bad packet */
1952 kfree_skb(skb);
1953 return 0;
1954 }
1955
1956 /* Callback from net/ipv{4,6}/udp.c to check that we have a VNI for errors */
vxlan_err_lookup(struct sock * sk,struct sk_buff * skb)1957 static int vxlan_err_lookup(struct sock *sk, struct sk_buff *skb)
1958 {
1959 struct vxlan_dev *vxlan;
1960 struct vxlan_sock *vs;
1961 struct vxlanhdr *hdr;
1962 __be32 vni;
1963
1964 if (!pskb_may_pull(skb, skb_transport_offset(skb) + VXLAN_HLEN))
1965 return -EINVAL;
1966
1967 hdr = vxlan_hdr(skb);
1968
1969 if (!(hdr->vx_flags & VXLAN_HF_VNI))
1970 return -EINVAL;
1971
1972 vs = rcu_dereference_sk_user_data(sk);
1973 if (!vs)
1974 return -ENOENT;
1975
1976 vni = vxlan_vni(hdr->vx_vni);
1977 vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni);
1978 if (!vxlan)
1979 return -ENOENT;
1980
1981 return 0;
1982 }
1983
arp_reduce(struct net_device * dev,struct sk_buff * skb,__be32 vni)1984 static int arp_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
1985 {
1986 struct vxlan_dev *vxlan = netdev_priv(dev);
1987 struct arphdr *parp;
1988 u8 *arpptr, *sha;
1989 __be32 sip, tip;
1990 struct neighbour *n;
1991
1992 if (dev->flags & IFF_NOARP)
1993 goto out;
1994
1995 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1996 dev->stats.tx_dropped++;
1997 goto out;
1998 }
1999 parp = arp_hdr(skb);
2000
2001 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
2002 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
2003 parp->ar_pro != htons(ETH_P_IP) ||
2004 parp->ar_op != htons(ARPOP_REQUEST) ||
2005 parp->ar_hln != dev->addr_len ||
2006 parp->ar_pln != 4)
2007 goto out;
2008 arpptr = (u8 *)parp + sizeof(struct arphdr);
2009 sha = arpptr;
2010 arpptr += dev->addr_len; /* sha */
2011 memcpy(&sip, arpptr, sizeof(sip));
2012 arpptr += sizeof(sip);
2013 arpptr += dev->addr_len; /* tha */
2014 memcpy(&tip, arpptr, sizeof(tip));
2015
2016 if (ipv4_is_loopback(tip) ||
2017 ipv4_is_multicast(tip))
2018 goto out;
2019
2020 n = neigh_lookup(&arp_tbl, &tip, dev);
2021
2022 if (n) {
2023 struct vxlan_fdb *f;
2024 struct sk_buff *reply;
2025
2026 if (!(n->nud_state & NUD_CONNECTED)) {
2027 neigh_release(n);
2028 goto out;
2029 }
2030
2031 f = vxlan_find_mac(vxlan, n->ha, vni);
2032 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
2033 /* bridge-local neighbor */
2034 neigh_release(n);
2035 goto out;
2036 }
2037
2038 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
2039 n->ha, sha);
2040
2041 neigh_release(n);
2042
2043 if (reply == NULL)
2044 goto out;
2045
2046 skb_reset_mac_header(reply);
2047 __skb_pull(reply, skb_network_offset(reply));
2048 reply->ip_summed = CHECKSUM_UNNECESSARY;
2049 reply->pkt_type = PACKET_HOST;
2050
2051 if (netif_rx_ni(reply) == NET_RX_DROP)
2052 dev->stats.rx_dropped++;
2053 } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
2054 union vxlan_addr ipa = {
2055 .sin.sin_addr.s_addr = tip,
2056 .sin.sin_family = AF_INET,
2057 };
2058
2059 vxlan_ip_miss(dev, &ipa);
2060 }
2061 out:
2062 consume_skb(skb);
2063 return NETDEV_TX_OK;
2064 }
2065
2066 #if IS_ENABLED(CONFIG_IPV6)
vxlan_na_create(struct sk_buff * request,struct neighbour * n,bool isrouter)2067 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
2068 struct neighbour *n, bool isrouter)
2069 {
2070 struct net_device *dev = request->dev;
2071 struct sk_buff *reply;
2072 struct nd_msg *ns, *na;
2073 struct ipv6hdr *pip6;
2074 u8 *daddr;
2075 int na_olen = 8; /* opt hdr + ETH_ALEN for target */
2076 int ns_olen;
2077 int i, len;
2078
2079 if (dev == NULL || !pskb_may_pull(request, request->len))
2080 return NULL;
2081
2082 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
2083 sizeof(*na) + na_olen + dev->needed_tailroom;
2084 reply = alloc_skb(len, GFP_ATOMIC);
2085 if (reply == NULL)
2086 return NULL;
2087
2088 reply->protocol = htons(ETH_P_IPV6);
2089 reply->dev = dev;
2090 skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
2091 skb_push(reply, sizeof(struct ethhdr));
2092 skb_reset_mac_header(reply);
2093
2094 ns = (struct nd_msg *)(ipv6_hdr(request) + 1);
2095
2096 daddr = eth_hdr(request)->h_source;
2097 ns_olen = request->len - skb_network_offset(request) -
2098 sizeof(struct ipv6hdr) - sizeof(*ns);
2099 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
2100 if (!ns->opt[i + 1]) {
2101 kfree_skb(reply);
2102 return NULL;
2103 }
2104 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
2105 daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
2106 break;
2107 }
2108 }
2109
2110 /* Ethernet header */
2111 ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
2112 ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
2113 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
2114 reply->protocol = htons(ETH_P_IPV6);
2115
2116 skb_pull(reply, sizeof(struct ethhdr));
2117 skb_reset_network_header(reply);
2118 skb_put(reply, sizeof(struct ipv6hdr));
2119
2120 /* IPv6 header */
2121
2122 pip6 = ipv6_hdr(reply);
2123 memset(pip6, 0, sizeof(struct ipv6hdr));
2124 pip6->version = 6;
2125 pip6->priority = ipv6_hdr(request)->priority;
2126 pip6->nexthdr = IPPROTO_ICMPV6;
2127 pip6->hop_limit = 255;
2128 pip6->daddr = ipv6_hdr(request)->saddr;
2129 pip6->saddr = *(struct in6_addr *)n->primary_key;
2130
2131 skb_pull(reply, sizeof(struct ipv6hdr));
2132 skb_reset_transport_header(reply);
2133
2134 /* Neighbor Advertisement */
2135 na = skb_put_zero(reply, sizeof(*na) + na_olen);
2136 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
2137 na->icmph.icmp6_router = isrouter;
2138 na->icmph.icmp6_override = 1;
2139 na->icmph.icmp6_solicited = 1;
2140 na->target = ns->target;
2141 ether_addr_copy(&na->opt[2], n->ha);
2142 na->opt[0] = ND_OPT_TARGET_LL_ADDR;
2143 na->opt[1] = na_olen >> 3;
2144
2145 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
2146 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
2147 csum_partial(na, sizeof(*na)+na_olen, 0));
2148
2149 pip6->payload_len = htons(sizeof(*na)+na_olen);
2150
2151 skb_push(reply, sizeof(struct ipv6hdr));
2152
2153 reply->ip_summed = CHECKSUM_UNNECESSARY;
2154
2155 return reply;
2156 }
2157
neigh_reduce(struct net_device * dev,struct sk_buff * skb,__be32 vni)2158 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
2159 {
2160 struct vxlan_dev *vxlan = netdev_priv(dev);
2161 const struct in6_addr *daddr;
2162 const struct ipv6hdr *iphdr;
2163 struct inet6_dev *in6_dev;
2164 struct neighbour *n;
2165 struct nd_msg *msg;
2166
2167 in6_dev = __in6_dev_get(dev);
2168 if (!in6_dev)
2169 goto out;
2170
2171 iphdr = ipv6_hdr(skb);
2172 daddr = &iphdr->daddr;
2173 msg = (struct nd_msg *)(iphdr + 1);
2174
2175 if (ipv6_addr_loopback(daddr) ||
2176 ipv6_addr_is_multicast(&msg->target))
2177 goto out;
2178
2179 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
2180
2181 if (n) {
2182 struct vxlan_fdb *f;
2183 struct sk_buff *reply;
2184
2185 if (!(n->nud_state & NUD_CONNECTED)) {
2186 neigh_release(n);
2187 goto out;
2188 }
2189
2190 f = vxlan_find_mac(vxlan, n->ha, vni);
2191 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
2192 /* bridge-local neighbor */
2193 neigh_release(n);
2194 goto out;
2195 }
2196
2197 reply = vxlan_na_create(skb, n,
2198 !!(f ? f->flags & NTF_ROUTER : 0));
2199
2200 neigh_release(n);
2201
2202 if (reply == NULL)
2203 goto out;
2204
2205 if (netif_rx_ni(reply) == NET_RX_DROP)
2206 dev->stats.rx_dropped++;
2207
2208 } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
2209 union vxlan_addr ipa = {
2210 .sin6.sin6_addr = msg->target,
2211 .sin6.sin6_family = AF_INET6,
2212 };
2213
2214 vxlan_ip_miss(dev, &ipa);
2215 }
2216
2217 out:
2218 consume_skb(skb);
2219 return NETDEV_TX_OK;
2220 }
2221 #endif
2222
route_shortcircuit(struct net_device * dev,struct sk_buff * skb)2223 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
2224 {
2225 struct vxlan_dev *vxlan = netdev_priv(dev);
2226 struct neighbour *n;
2227
2228 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
2229 return false;
2230
2231 n = NULL;
2232 switch (ntohs(eth_hdr(skb)->h_proto)) {
2233 case ETH_P_IP:
2234 {
2235 struct iphdr *pip;
2236
2237 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
2238 return false;
2239 pip = ip_hdr(skb);
2240 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
2241 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
2242 union vxlan_addr ipa = {
2243 .sin.sin_addr.s_addr = pip->daddr,
2244 .sin.sin_family = AF_INET,
2245 };
2246
2247 vxlan_ip_miss(dev, &ipa);
2248 return false;
2249 }
2250
2251 break;
2252 }
2253 #if IS_ENABLED(CONFIG_IPV6)
2254 case ETH_P_IPV6:
2255 {
2256 struct ipv6hdr *pip6;
2257
2258 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
2259 return false;
2260 pip6 = ipv6_hdr(skb);
2261 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
2262 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
2263 union vxlan_addr ipa = {
2264 .sin6.sin6_addr = pip6->daddr,
2265 .sin6.sin6_family = AF_INET6,
2266 };
2267
2268 vxlan_ip_miss(dev, &ipa);
2269 return false;
2270 }
2271
2272 break;
2273 }
2274 #endif
2275 default:
2276 return false;
2277 }
2278
2279 if (n) {
2280 bool diff;
2281
2282 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
2283 if (diff) {
2284 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
2285 dev->addr_len);
2286 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
2287 }
2288 neigh_release(n);
2289 return diff;
2290 }
2291
2292 return false;
2293 }
2294
vxlan_build_gbp_hdr(struct vxlanhdr * vxh,u32 vxflags,struct vxlan_metadata * md)2295 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
2296 struct vxlan_metadata *md)
2297 {
2298 struct vxlanhdr_gbp *gbp;
2299
2300 if (!md->gbp)
2301 return;
2302
2303 gbp = (struct vxlanhdr_gbp *)vxh;
2304 vxh->vx_flags |= VXLAN_HF_GBP;
2305
2306 if (md->gbp & VXLAN_GBP_DONT_LEARN)
2307 gbp->dont_learn = 1;
2308
2309 if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
2310 gbp->policy_applied = 1;
2311
2312 gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
2313 }
2314
vxlan_build_gpe_hdr(struct vxlanhdr * vxh,u32 vxflags,__be16 protocol)2315 static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, u32 vxflags,
2316 __be16 protocol)
2317 {
2318 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh;
2319
2320 gpe->np_applied = 1;
2321 gpe->next_protocol = tun_p_from_eth_p(protocol);
2322 if (!gpe->next_protocol)
2323 return -EPFNOSUPPORT;
2324 return 0;
2325 }
2326
vxlan_build_skb(struct sk_buff * skb,struct dst_entry * dst,int iphdr_len,__be32 vni,struct vxlan_metadata * md,u32 vxflags,bool udp_sum)2327 static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
2328 int iphdr_len, __be32 vni,
2329 struct vxlan_metadata *md, u32 vxflags,
2330 bool udp_sum)
2331 {
2332 struct vxlanhdr *vxh;
2333 int min_headroom;
2334 int err;
2335 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
2336 __be16 inner_protocol = htons(ETH_P_TEB);
2337
2338 if ((vxflags & VXLAN_F_REMCSUM_TX) &&
2339 skb->ip_summed == CHECKSUM_PARTIAL) {
2340 int csum_start = skb_checksum_start_offset(skb);
2341
2342 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
2343 !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
2344 (skb->csum_offset == offsetof(struct udphdr, check) ||
2345 skb->csum_offset == offsetof(struct tcphdr, check)))
2346 type |= SKB_GSO_TUNNEL_REMCSUM;
2347 }
2348
2349 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
2350 + VXLAN_HLEN + iphdr_len;
2351
2352 /* Need space for new headers (invalidates iph ptr) */
2353 err = skb_cow_head(skb, min_headroom);
2354 if (unlikely(err))
2355 return err;
2356
2357 err = iptunnel_handle_offloads(skb, type);
2358 if (err)
2359 return err;
2360
2361 vxh = __skb_push(skb, sizeof(*vxh));
2362 vxh->vx_flags = VXLAN_HF_VNI;
2363 vxh->vx_vni = vxlan_vni_field(vni);
2364
2365 if (type & SKB_GSO_TUNNEL_REMCSUM) {
2366 unsigned int start;
2367
2368 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
2369 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
2370 vxh->vx_flags |= VXLAN_HF_RCO;
2371
2372 if (!skb_is_gso(skb)) {
2373 skb->ip_summed = CHECKSUM_NONE;
2374 skb->encapsulation = 0;
2375 }
2376 }
2377
2378 if (vxflags & VXLAN_F_GBP)
2379 vxlan_build_gbp_hdr(vxh, vxflags, md);
2380 if (vxflags & VXLAN_F_GPE) {
2381 err = vxlan_build_gpe_hdr(vxh, vxflags, skb->protocol);
2382 if (err < 0)
2383 return err;
2384 inner_protocol = skb->protocol;
2385 }
2386
2387 skb_set_inner_protocol(skb, inner_protocol);
2388 return 0;
2389 }
2390
vxlan_get_route(struct vxlan_dev * vxlan,struct net_device * dev,struct vxlan_sock * sock4,struct sk_buff * skb,int oif,u8 tos,__be32 daddr,__be32 * saddr,__be16 dport,__be16 sport,struct dst_cache * dst_cache,const struct ip_tunnel_info * info)2391 static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan, struct net_device *dev,
2392 struct vxlan_sock *sock4,
2393 struct sk_buff *skb, int oif, u8 tos,
2394 __be32 daddr, __be32 *saddr, __be16 dport, __be16 sport,
2395 struct dst_cache *dst_cache,
2396 const struct ip_tunnel_info *info)
2397 {
2398 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
2399 struct rtable *rt = NULL;
2400 struct flowi4 fl4;
2401
2402 if (!sock4)
2403 return ERR_PTR(-EIO);
2404
2405 if (tos && !info)
2406 use_cache = false;
2407 if (use_cache) {
2408 rt = dst_cache_get_ip4(dst_cache, saddr);
2409 if (rt)
2410 return rt;
2411 }
2412
2413 memset(&fl4, 0, sizeof(fl4));
2414 fl4.flowi4_oif = oif;
2415 fl4.flowi4_tos = RT_TOS(tos);
2416 fl4.flowi4_mark = skb->mark;
2417 fl4.flowi4_proto = IPPROTO_UDP;
2418 fl4.daddr = daddr;
2419 fl4.saddr = *saddr;
2420 fl4.fl4_dport = dport;
2421 fl4.fl4_sport = sport;
2422
2423 rt = ip_route_output_key(vxlan->net, &fl4);
2424 if (!IS_ERR(rt)) {
2425 if (rt->dst.dev == dev) {
2426 netdev_dbg(dev, "circular route to %pI4\n", &daddr);
2427 ip_rt_put(rt);
2428 return ERR_PTR(-ELOOP);
2429 }
2430
2431 *saddr = fl4.saddr;
2432 if (use_cache)
2433 dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
2434 } else {
2435 netdev_dbg(dev, "no route to %pI4\n", &daddr);
2436 return ERR_PTR(-ENETUNREACH);
2437 }
2438 return rt;
2439 }
2440
2441 #if IS_ENABLED(CONFIG_IPV6)
vxlan6_get_route(struct vxlan_dev * vxlan,struct net_device * dev,struct vxlan_sock * sock6,struct sk_buff * skb,int oif,u8 tos,__be32 label,const struct in6_addr * daddr,struct in6_addr * saddr,__be16 dport,__be16 sport,struct dst_cache * dst_cache,const struct ip_tunnel_info * info)2442 static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
2443 struct net_device *dev,
2444 struct vxlan_sock *sock6,
2445 struct sk_buff *skb, int oif, u8 tos,
2446 __be32 label,
2447 const struct in6_addr *daddr,
2448 struct in6_addr *saddr,
2449 __be16 dport, __be16 sport,
2450 struct dst_cache *dst_cache,
2451 const struct ip_tunnel_info *info)
2452 {
2453 bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
2454 struct dst_entry *ndst;
2455 struct flowi6 fl6;
2456
2457 if (!sock6)
2458 return ERR_PTR(-EIO);
2459
2460 if (tos && !info)
2461 use_cache = false;
2462 if (use_cache) {
2463 ndst = dst_cache_get_ip6(dst_cache, saddr);
2464 if (ndst)
2465 return ndst;
2466 }
2467
2468 memset(&fl6, 0, sizeof(fl6));
2469 fl6.flowi6_oif = oif;
2470 fl6.daddr = *daddr;
2471 fl6.saddr = *saddr;
2472 fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tos), label);
2473 fl6.flowi6_mark = skb->mark;
2474 fl6.flowi6_proto = IPPROTO_UDP;
2475 fl6.fl6_dport = dport;
2476 fl6.fl6_sport = sport;
2477
2478 ndst = ipv6_stub->ipv6_dst_lookup_flow(vxlan->net, sock6->sock->sk,
2479 &fl6, NULL);
2480 if (IS_ERR(ndst)) {
2481 netdev_dbg(dev, "no route to %pI6\n", daddr);
2482 return ERR_PTR(-ENETUNREACH);
2483 }
2484
2485 if (unlikely(ndst->dev == dev)) {
2486 netdev_dbg(dev, "circular route to %pI6\n", daddr);
2487 dst_release(ndst);
2488 return ERR_PTR(-ELOOP);
2489 }
2490
2491 *saddr = fl6.saddr;
2492 if (use_cache)
2493 dst_cache_set_ip6(dst_cache, ndst, saddr);
2494 return ndst;
2495 }
2496 #endif
2497
2498 /* Bypass encapsulation if the destination is local */
vxlan_encap_bypass(struct sk_buff * skb,struct vxlan_dev * src_vxlan,struct vxlan_dev * dst_vxlan,__be32 vni,bool snoop)2499 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
2500 struct vxlan_dev *dst_vxlan, __be32 vni,
2501 bool snoop)
2502 {
2503 struct pcpu_sw_netstats *tx_stats, *rx_stats;
2504 union vxlan_addr loopback;
2505 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
2506 struct net_device *dev;
2507 int len = skb->len;
2508
2509 tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
2510 rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
2511 skb->pkt_type = PACKET_HOST;
2512 skb->encapsulation = 0;
2513 skb->dev = dst_vxlan->dev;
2514 __skb_pull(skb, skb_network_offset(skb));
2515
2516 if (remote_ip->sa.sa_family == AF_INET) {
2517 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
2518 loopback.sa.sa_family = AF_INET;
2519 #if IS_ENABLED(CONFIG_IPV6)
2520 } else {
2521 loopback.sin6.sin6_addr = in6addr_loopback;
2522 loopback.sa.sa_family = AF_INET6;
2523 #endif
2524 }
2525
2526 rcu_read_lock();
2527 dev = skb->dev;
2528 if (unlikely(!(dev->flags & IFF_UP))) {
2529 kfree_skb(skb);
2530 goto drop;
2531 }
2532
2533 if ((dst_vxlan->cfg.flags & VXLAN_F_LEARN) && snoop)
2534 vxlan_snoop(dev, &loopback, eth_hdr(skb)->h_source, 0, vni);
2535
2536 u64_stats_update_begin(&tx_stats->syncp);
2537 tx_stats->tx_packets++;
2538 tx_stats->tx_bytes += len;
2539 u64_stats_update_end(&tx_stats->syncp);
2540
2541 if (netif_rx(skb) == NET_RX_SUCCESS) {
2542 u64_stats_update_begin(&rx_stats->syncp);
2543 rx_stats->rx_packets++;
2544 rx_stats->rx_bytes += len;
2545 u64_stats_update_end(&rx_stats->syncp);
2546 } else {
2547 drop:
2548 dev->stats.rx_dropped++;
2549 }
2550 rcu_read_unlock();
2551 }
2552
encap_bypass_if_local(struct sk_buff * skb,struct net_device * dev,struct vxlan_dev * vxlan,union vxlan_addr * daddr,__be16 dst_port,int dst_ifindex,__be32 vni,struct dst_entry * dst,u32 rt_flags)2553 static int encap_bypass_if_local(struct sk_buff *skb, struct net_device *dev,
2554 struct vxlan_dev *vxlan,
2555 union vxlan_addr *daddr,
2556 __be16 dst_port, int dst_ifindex, __be32 vni,
2557 struct dst_entry *dst,
2558 u32 rt_flags)
2559 {
2560 #if IS_ENABLED(CONFIG_IPV6)
2561 /* IPv6 rt-flags are checked against RTF_LOCAL, but the value of
2562 * RTF_LOCAL is equal to RTCF_LOCAL. So to keep code simple
2563 * we can use RTCF_LOCAL which works for ipv4 and ipv6 route entry.
2564 */
2565 BUILD_BUG_ON(RTCF_LOCAL != RTF_LOCAL);
2566 #endif
2567 /* Bypass encapsulation if the destination is local */
2568 if (rt_flags & RTCF_LOCAL &&
2569 !(rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2570 struct vxlan_dev *dst_vxlan;
2571
2572 dst_release(dst);
2573 dst_vxlan = vxlan_find_vni(vxlan->net, dst_ifindex, vni,
2574 daddr->sa.sa_family, dst_port,
2575 vxlan->cfg.flags);
2576 if (!dst_vxlan) {
2577 dev->stats.tx_errors++;
2578 kfree_skb(skb);
2579
2580 return -ENOENT;
2581 }
2582 vxlan_encap_bypass(skb, vxlan, dst_vxlan, vni, true);
2583 return 1;
2584 }
2585
2586 return 0;
2587 }
2588
vxlan_xmit_one(struct sk_buff * skb,struct net_device * dev,__be32 default_vni,struct vxlan_rdst * rdst,bool did_rsc)2589 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
2590 __be32 default_vni, struct vxlan_rdst *rdst,
2591 bool did_rsc)
2592 {
2593 struct dst_cache *dst_cache;
2594 struct ip_tunnel_info *info;
2595 struct vxlan_dev *vxlan = netdev_priv(dev);
2596 const struct iphdr *old_iph = ip_hdr(skb);
2597 union vxlan_addr *dst;
2598 union vxlan_addr remote_ip, local_ip;
2599 struct vxlan_metadata _md;
2600 struct vxlan_metadata *md = &_md;
2601 __be16 src_port = 0, dst_port;
2602 struct dst_entry *ndst = NULL;
2603 __be32 vni, label;
2604 __u8 tos, ttl;
2605 int ifindex;
2606 int err;
2607 u32 flags = vxlan->cfg.flags;
2608 bool udp_sum = false;
2609 bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
2610
2611 info = skb_tunnel_info(skb);
2612
2613 if (rdst) {
2614 dst = &rdst->remote_ip;
2615 if (vxlan_addr_any(dst)) {
2616 if (did_rsc) {
2617 /* short-circuited back to local bridge */
2618 vxlan_encap_bypass(skb, vxlan, vxlan,
2619 default_vni, true);
2620 return;
2621 }
2622 goto drop;
2623 }
2624
2625 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
2626 vni = (rdst->remote_vni) ? : default_vni;
2627 ifindex = rdst->remote_ifindex;
2628 local_ip = vxlan->cfg.saddr;
2629 dst_cache = &rdst->dst_cache;
2630 md->gbp = skb->mark;
2631 if (flags & VXLAN_F_TTL_INHERIT) {
2632 ttl = ip_tunnel_get_ttl(old_iph, skb);
2633 } else {
2634 ttl = vxlan->cfg.ttl;
2635 if (!ttl && vxlan_addr_multicast(dst))
2636 ttl = 1;
2637 }
2638
2639 tos = vxlan->cfg.tos;
2640 if (tos == 1)
2641 tos = ip_tunnel_get_dsfield(old_iph, skb);
2642
2643 if (dst->sa.sa_family == AF_INET)
2644 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
2645 else
2646 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2647 label = vxlan->cfg.label;
2648 } else {
2649 if (!info) {
2650 WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
2651 dev->name);
2652 goto drop;
2653 }
2654 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
2655 if (remote_ip.sa.sa_family == AF_INET) {
2656 remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
2657 local_ip.sin.sin_addr.s_addr = info->key.u.ipv4.src;
2658 } else {
2659 remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
2660 local_ip.sin6.sin6_addr = info->key.u.ipv6.src;
2661 }
2662 dst = &remote_ip;
2663 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
2664 vni = tunnel_id_to_key32(info->key.tun_id);
2665 ifindex = 0;
2666 dst_cache = &info->dst_cache;
2667 if (info->key.tun_flags & TUNNEL_VXLAN_OPT) {
2668 if (info->options_len < sizeof(*md))
2669 goto drop;
2670 md = ip_tunnel_info_opts(info);
2671 }
2672 ttl = info->key.ttl;
2673 tos = info->key.tos;
2674 label = info->key.label;
2675 udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
2676 }
2677 src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2678 vxlan->cfg.port_max, true);
2679
2680 rcu_read_lock();
2681 if (dst->sa.sa_family == AF_INET) {
2682 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
2683 struct rtable *rt;
2684 __be16 df = 0;
2685
2686 if (!ifindex)
2687 ifindex = sock4->sock->sk->sk_bound_dev_if;
2688
2689 rt = vxlan_get_route(vxlan, dev, sock4, skb, ifindex, tos,
2690 dst->sin.sin_addr.s_addr,
2691 &local_ip.sin.sin_addr.s_addr,
2692 dst_port, src_port,
2693 dst_cache, info);
2694 if (IS_ERR(rt)) {
2695 err = PTR_ERR(rt);
2696 goto tx_error;
2697 }
2698
2699 if (!info) {
2700 /* Bypass encapsulation if the destination is local */
2701 err = encap_bypass_if_local(skb, dev, vxlan, dst,
2702 dst_port, ifindex, vni,
2703 &rt->dst, rt->rt_flags);
2704 if (err)
2705 goto out_unlock;
2706
2707 if (vxlan->cfg.df == VXLAN_DF_SET) {
2708 df = htons(IP_DF);
2709 } else if (vxlan->cfg.df == VXLAN_DF_INHERIT) {
2710 struct ethhdr *eth = eth_hdr(skb);
2711
2712 if (ntohs(eth->h_proto) == ETH_P_IPV6 ||
2713 (ntohs(eth->h_proto) == ETH_P_IP &&
2714 old_iph->frag_off & htons(IP_DF)))
2715 df = htons(IP_DF);
2716 }
2717 } else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT) {
2718 df = htons(IP_DF);
2719 }
2720
2721 ndst = &rt->dst;
2722 err = skb_tunnel_check_pmtu(skb, ndst, VXLAN_HEADROOM,
2723 netif_is_any_bridge_port(dev));
2724 if (err < 0) {
2725 goto tx_error;
2726 } else if (err) {
2727 if (info) {
2728 struct ip_tunnel_info *unclone;
2729 struct in_addr src, dst;
2730
2731 unclone = skb_tunnel_info_unclone(skb);
2732 if (unlikely(!unclone))
2733 goto tx_error;
2734
2735 src = remote_ip.sin.sin_addr;
2736 dst = local_ip.sin.sin_addr;
2737 unclone->key.u.ipv4.src = src.s_addr;
2738 unclone->key.u.ipv4.dst = dst.s_addr;
2739 }
2740 vxlan_encap_bypass(skb, vxlan, vxlan, vni, false);
2741 dst_release(ndst);
2742 goto out_unlock;
2743 }
2744
2745 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2746 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2747 err = vxlan_build_skb(skb, ndst, sizeof(struct iphdr),
2748 vni, md, flags, udp_sum);
2749 if (err < 0)
2750 goto tx_error;
2751
2752 udp_tunnel_xmit_skb(rt, sock4->sock->sk, skb, local_ip.sin.sin_addr.s_addr,
2753 dst->sin.sin_addr.s_addr, tos, ttl, df,
2754 src_port, dst_port, xnet, !udp_sum);
2755 #if IS_ENABLED(CONFIG_IPV6)
2756 } else {
2757 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
2758
2759 if (!ifindex)
2760 ifindex = sock6->sock->sk->sk_bound_dev_if;
2761
2762 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, ifindex, tos,
2763 label, &dst->sin6.sin6_addr,
2764 &local_ip.sin6.sin6_addr,
2765 dst_port, src_port,
2766 dst_cache, info);
2767 if (IS_ERR(ndst)) {
2768 err = PTR_ERR(ndst);
2769 ndst = NULL;
2770 goto tx_error;
2771 }
2772
2773 if (!info) {
2774 u32 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2775
2776 err = encap_bypass_if_local(skb, dev, vxlan, dst,
2777 dst_port, ifindex, vni,
2778 ndst, rt6i_flags);
2779 if (err)
2780 goto out_unlock;
2781 }
2782
2783 err = skb_tunnel_check_pmtu(skb, ndst, VXLAN6_HEADROOM,
2784 netif_is_any_bridge_port(dev));
2785 if (err < 0) {
2786 goto tx_error;
2787 } else if (err) {
2788 if (info) {
2789 struct ip_tunnel_info *unclone;
2790 struct in6_addr src, dst;
2791
2792 unclone = skb_tunnel_info_unclone(skb);
2793 if (unlikely(!unclone))
2794 goto tx_error;
2795
2796 src = remote_ip.sin6.sin6_addr;
2797 dst = local_ip.sin6.sin6_addr;
2798 unclone->key.u.ipv6.src = src;
2799 unclone->key.u.ipv6.dst = dst;
2800 }
2801
2802 vxlan_encap_bypass(skb, vxlan, vxlan, vni, false);
2803 dst_release(ndst);
2804 goto out_unlock;
2805 }
2806
2807 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2808 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2809 skb_scrub_packet(skb, xnet);
2810 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
2811 vni, md, flags, udp_sum);
2812 if (err < 0)
2813 goto tx_error;
2814
2815 udp_tunnel6_xmit_skb(ndst, sock6->sock->sk, skb, dev,
2816 &local_ip.sin6.sin6_addr,
2817 &dst->sin6.sin6_addr, tos, ttl,
2818 label, src_port, dst_port, !udp_sum);
2819 #endif
2820 }
2821 out_unlock:
2822 rcu_read_unlock();
2823 return;
2824
2825 drop:
2826 dev->stats.tx_dropped++;
2827 dev_kfree_skb(skb);
2828 return;
2829
2830 tx_error:
2831 rcu_read_unlock();
2832 if (err == -ELOOP)
2833 dev->stats.collisions++;
2834 else if (err == -ENETUNREACH)
2835 dev->stats.tx_carrier_errors++;
2836 dst_release(ndst);
2837 dev->stats.tx_errors++;
2838 kfree_skb(skb);
2839 }
2840
vxlan_xmit_nh(struct sk_buff * skb,struct net_device * dev,struct vxlan_fdb * f,__be32 vni,bool did_rsc)2841 static void vxlan_xmit_nh(struct sk_buff *skb, struct net_device *dev,
2842 struct vxlan_fdb *f, __be32 vni, bool did_rsc)
2843 {
2844 struct vxlan_rdst nh_rdst;
2845 struct nexthop *nh;
2846 bool do_xmit;
2847 u32 hash;
2848
2849 memset(&nh_rdst, 0, sizeof(struct vxlan_rdst));
2850 hash = skb_get_hash(skb);
2851
2852 rcu_read_lock();
2853 nh = rcu_dereference(f->nh);
2854 if (!nh) {
2855 rcu_read_unlock();
2856 goto drop;
2857 }
2858 do_xmit = vxlan_fdb_nh_path_select(nh, hash, &nh_rdst);
2859 rcu_read_unlock();
2860
2861 if (likely(do_xmit))
2862 vxlan_xmit_one(skb, dev, vni, &nh_rdst, did_rsc);
2863 else
2864 goto drop;
2865
2866 return;
2867
2868 drop:
2869 dev->stats.tx_dropped++;
2870 dev_kfree_skb(skb);
2871 }
2872
2873 /* Transmit local packets over Vxlan
2874 *
2875 * Outer IP header inherits ECN and DF from inner header.
2876 * Outer UDP destination is the VXLAN assigned port.
2877 * source port is based on hash of flow
2878 */
vxlan_xmit(struct sk_buff * skb,struct net_device * dev)2879 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2880 {
2881 struct vxlan_dev *vxlan = netdev_priv(dev);
2882 struct vxlan_rdst *rdst, *fdst = NULL;
2883 const struct ip_tunnel_info *info;
2884 bool did_rsc = false;
2885 struct vxlan_fdb *f;
2886 struct ethhdr *eth;
2887 __be32 vni = 0;
2888
2889 info = skb_tunnel_info(skb);
2890
2891 skb_reset_mac_header(skb);
2892
2893 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
2894 if (info && info->mode & IP_TUNNEL_INFO_BRIDGE &&
2895 info->mode & IP_TUNNEL_INFO_TX) {
2896 vni = tunnel_id_to_key32(info->key.tun_id);
2897 } else {
2898 if (info && info->mode & IP_TUNNEL_INFO_TX)
2899 vxlan_xmit_one(skb, dev, vni, NULL, false);
2900 else
2901 kfree_skb(skb);
2902 return NETDEV_TX_OK;
2903 }
2904 }
2905
2906 if (vxlan->cfg.flags & VXLAN_F_PROXY) {
2907 eth = eth_hdr(skb);
2908 if (ntohs(eth->h_proto) == ETH_P_ARP)
2909 return arp_reduce(dev, skb, vni);
2910 #if IS_ENABLED(CONFIG_IPV6)
2911 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2912 pskb_may_pull(skb, sizeof(struct ipv6hdr) +
2913 sizeof(struct nd_msg)) &&
2914 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2915 struct nd_msg *m = (struct nd_msg *)(ipv6_hdr(skb) + 1);
2916
2917 if (m->icmph.icmp6_code == 0 &&
2918 m->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2919 return neigh_reduce(dev, skb, vni);
2920 }
2921 #endif
2922 }
2923
2924 eth = eth_hdr(skb);
2925 f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2926 did_rsc = false;
2927
2928 if (f && (f->flags & NTF_ROUTER) && (vxlan->cfg.flags & VXLAN_F_RSC) &&
2929 (ntohs(eth->h_proto) == ETH_P_IP ||
2930 ntohs(eth->h_proto) == ETH_P_IPV6)) {
2931 did_rsc = route_shortcircuit(dev, skb);
2932 if (did_rsc)
2933 f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2934 }
2935
2936 if (f == NULL) {
2937 f = vxlan_find_mac(vxlan, all_zeros_mac, vni);
2938 if (f == NULL) {
2939 if ((vxlan->cfg.flags & VXLAN_F_L2MISS) &&
2940 !is_multicast_ether_addr(eth->h_dest))
2941 vxlan_fdb_miss(vxlan, eth->h_dest);
2942
2943 dev->stats.tx_dropped++;
2944 kfree_skb(skb);
2945 return NETDEV_TX_OK;
2946 }
2947 }
2948
2949 if (rcu_access_pointer(f->nh)) {
2950 vxlan_xmit_nh(skb, dev, f,
2951 (vni ? : vxlan->default_dst.remote_vni), did_rsc);
2952 } else {
2953 list_for_each_entry_rcu(rdst, &f->remotes, list) {
2954 struct sk_buff *skb1;
2955
2956 if (!fdst) {
2957 fdst = rdst;
2958 continue;
2959 }
2960 skb1 = skb_clone(skb, GFP_ATOMIC);
2961 if (skb1)
2962 vxlan_xmit_one(skb1, dev, vni, rdst, did_rsc);
2963 }
2964 if (fdst)
2965 vxlan_xmit_one(skb, dev, vni, fdst, did_rsc);
2966 else
2967 kfree_skb(skb);
2968 }
2969
2970 return NETDEV_TX_OK;
2971 }
2972
2973 /* Walk the forwarding table and purge stale entries */
vxlan_cleanup(struct timer_list * t)2974 static void vxlan_cleanup(struct timer_list *t)
2975 {
2976 struct vxlan_dev *vxlan = from_timer(vxlan, t, age_timer);
2977 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2978 unsigned int h;
2979
2980 if (!netif_running(vxlan->dev))
2981 return;
2982
2983 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2984 struct hlist_node *p, *n;
2985
2986 spin_lock(&vxlan->hash_lock[h]);
2987 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2988 struct vxlan_fdb *f
2989 = container_of(p, struct vxlan_fdb, hlist);
2990 unsigned long timeout;
2991
2992 if (f->state & (NUD_PERMANENT | NUD_NOARP))
2993 continue;
2994
2995 if (f->flags & NTF_EXT_LEARNED)
2996 continue;
2997
2998 timeout = f->used + vxlan->cfg.age_interval * HZ;
2999 if (time_before_eq(timeout, jiffies)) {
3000 netdev_dbg(vxlan->dev,
3001 "garbage collect %pM\n",
3002 f->eth_addr);
3003 f->state = NUD_STALE;
3004 vxlan_fdb_destroy(vxlan, f, true, true);
3005 } else if (time_before(timeout, next_timer))
3006 next_timer = timeout;
3007 }
3008 spin_unlock(&vxlan->hash_lock[h]);
3009 }
3010
3011 mod_timer(&vxlan->age_timer, next_timer);
3012 }
3013
vxlan_vs_del_dev(struct vxlan_dev * vxlan)3014 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan)
3015 {
3016 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
3017
3018 spin_lock(&vn->sock_lock);
3019 hlist_del_init_rcu(&vxlan->hlist4.hlist);
3020 #if IS_ENABLED(CONFIG_IPV6)
3021 hlist_del_init_rcu(&vxlan->hlist6.hlist);
3022 #endif
3023 spin_unlock(&vn->sock_lock);
3024 }
3025
vxlan_vs_add_dev(struct vxlan_sock * vs,struct vxlan_dev * vxlan,struct vxlan_dev_node * node)3026 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan,
3027 struct vxlan_dev_node *node)
3028 {
3029 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
3030 __be32 vni = vxlan->default_dst.remote_vni;
3031
3032 node->vxlan = vxlan;
3033 spin_lock(&vn->sock_lock);
3034 hlist_add_head_rcu(&node->hlist, vni_head(vs, vni));
3035 spin_unlock(&vn->sock_lock);
3036 }
3037
3038 /* Setup stats when device is created */
vxlan_init(struct net_device * dev)3039 static int vxlan_init(struct net_device *dev)
3040 {
3041 struct vxlan_dev *vxlan = netdev_priv(dev);
3042 int err;
3043
3044 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
3045 if (!dev->tstats)
3046 return -ENOMEM;
3047
3048 err = gro_cells_init(&vxlan->gro_cells, dev);
3049 if (err) {
3050 free_percpu(dev->tstats);
3051 return err;
3052 }
3053
3054 return 0;
3055 }
3056
vxlan_fdb_delete_default(struct vxlan_dev * vxlan,__be32 vni)3057 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan, __be32 vni)
3058 {
3059 struct vxlan_fdb *f;
3060 u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, vni);
3061
3062 spin_lock_bh(&vxlan->hash_lock[hash_index]);
3063 f = __vxlan_find_mac(vxlan, all_zeros_mac, vni);
3064 if (f)
3065 vxlan_fdb_destroy(vxlan, f, true, true);
3066 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
3067 }
3068
vxlan_uninit(struct net_device * dev)3069 static void vxlan_uninit(struct net_device *dev)
3070 {
3071 struct vxlan_dev *vxlan = netdev_priv(dev);
3072
3073 gro_cells_destroy(&vxlan->gro_cells);
3074
3075 vxlan_fdb_delete_default(vxlan, vxlan->cfg.vni);
3076
3077 free_percpu(dev->tstats);
3078 }
3079
3080 /* Start ageing timer and join group when device is brought up */
vxlan_open(struct net_device * dev)3081 static int vxlan_open(struct net_device *dev)
3082 {
3083 struct vxlan_dev *vxlan = netdev_priv(dev);
3084 int ret;
3085
3086 ret = vxlan_sock_add(vxlan);
3087 if (ret < 0)
3088 return ret;
3089
3090 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
3091 ret = vxlan_igmp_join(vxlan);
3092 if (ret == -EADDRINUSE)
3093 ret = 0;
3094 if (ret) {
3095 vxlan_sock_release(vxlan);
3096 return ret;
3097 }
3098 }
3099
3100 if (vxlan->cfg.age_interval)
3101 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
3102
3103 return ret;
3104 }
3105
3106 /* Purge the forwarding table */
vxlan_flush(struct vxlan_dev * vxlan,bool do_all)3107 static void vxlan_flush(struct vxlan_dev *vxlan, bool do_all)
3108 {
3109 unsigned int h;
3110
3111 for (h = 0; h < FDB_HASH_SIZE; ++h) {
3112 struct hlist_node *p, *n;
3113
3114 spin_lock_bh(&vxlan->hash_lock[h]);
3115 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
3116 struct vxlan_fdb *f
3117 = container_of(p, struct vxlan_fdb, hlist);
3118 if (!do_all && (f->state & (NUD_PERMANENT | NUD_NOARP)))
3119 continue;
3120 /* the all_zeros_mac entry is deleted at vxlan_uninit */
3121 if (is_zero_ether_addr(f->eth_addr) &&
3122 f->vni == vxlan->cfg.vni)
3123 continue;
3124 vxlan_fdb_destroy(vxlan, f, true, true);
3125 }
3126 spin_unlock_bh(&vxlan->hash_lock[h]);
3127 }
3128 }
3129
3130 /* Cleanup timer and forwarding table on shutdown */
vxlan_stop(struct net_device * dev)3131 static int vxlan_stop(struct net_device *dev)
3132 {
3133 struct vxlan_dev *vxlan = netdev_priv(dev);
3134 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
3135 int ret = 0;
3136
3137 if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
3138 !vxlan_group_used(vn, vxlan))
3139 ret = vxlan_igmp_leave(vxlan);
3140
3141 del_timer_sync(&vxlan->age_timer);
3142
3143 vxlan_flush(vxlan, false);
3144 vxlan_sock_release(vxlan);
3145
3146 return ret;
3147 }
3148
3149 /* Stub, nothing needs to be done. */
vxlan_set_multicast_list(struct net_device * dev)3150 static void vxlan_set_multicast_list(struct net_device *dev)
3151 {
3152 }
3153
vxlan_change_mtu(struct net_device * dev,int new_mtu)3154 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
3155 {
3156 struct vxlan_dev *vxlan = netdev_priv(dev);
3157 struct vxlan_rdst *dst = &vxlan->default_dst;
3158 struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
3159 dst->remote_ifindex);
3160 bool use_ipv6 = !!(vxlan->cfg.flags & VXLAN_F_IPV6);
3161
3162 /* This check is different than dev->max_mtu, because it looks at
3163 * the lowerdev->mtu, rather than the static dev->max_mtu
3164 */
3165 if (lowerdev) {
3166 int max_mtu = lowerdev->mtu -
3167 (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
3168 if (new_mtu > max_mtu)
3169 return -EINVAL;
3170 }
3171
3172 dev->mtu = new_mtu;
3173 return 0;
3174 }
3175
vxlan_fill_metadata_dst(struct net_device * dev,struct sk_buff * skb)3176 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
3177 {
3178 struct vxlan_dev *vxlan = netdev_priv(dev);
3179 struct ip_tunnel_info *info = skb_tunnel_info(skb);
3180 __be16 sport, dport;
3181
3182 sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
3183 vxlan->cfg.port_max, true);
3184 dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
3185
3186 if (ip_tunnel_info_af(info) == AF_INET) {
3187 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
3188 struct rtable *rt;
3189
3190 rt = vxlan_get_route(vxlan, dev, sock4, skb, 0, info->key.tos,
3191 info->key.u.ipv4.dst,
3192 &info->key.u.ipv4.src, dport, sport,
3193 &info->dst_cache, info);
3194 if (IS_ERR(rt))
3195 return PTR_ERR(rt);
3196 ip_rt_put(rt);
3197 } else {
3198 #if IS_ENABLED(CONFIG_IPV6)
3199 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
3200 struct dst_entry *ndst;
3201
3202 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, 0, info->key.tos,
3203 info->key.label, &info->key.u.ipv6.dst,
3204 &info->key.u.ipv6.src, dport, sport,
3205 &info->dst_cache, info);
3206 if (IS_ERR(ndst))
3207 return PTR_ERR(ndst);
3208 dst_release(ndst);
3209 #else /* !CONFIG_IPV6 */
3210 return -EPFNOSUPPORT;
3211 #endif
3212 }
3213 info->key.tp_src = sport;
3214 info->key.tp_dst = dport;
3215 return 0;
3216 }
3217
3218 static const struct net_device_ops vxlan_netdev_ether_ops = {
3219 .ndo_init = vxlan_init,
3220 .ndo_uninit = vxlan_uninit,
3221 .ndo_open = vxlan_open,
3222 .ndo_stop = vxlan_stop,
3223 .ndo_start_xmit = vxlan_xmit,
3224 .ndo_get_stats64 = dev_get_tstats64,
3225 .ndo_set_rx_mode = vxlan_set_multicast_list,
3226 .ndo_change_mtu = vxlan_change_mtu,
3227 .ndo_validate_addr = eth_validate_addr,
3228 .ndo_set_mac_address = eth_mac_addr,
3229 .ndo_fdb_add = vxlan_fdb_add,
3230 .ndo_fdb_del = vxlan_fdb_delete,
3231 .ndo_fdb_dump = vxlan_fdb_dump,
3232 .ndo_fdb_get = vxlan_fdb_get,
3233 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
3234 .ndo_change_proto_down = dev_change_proto_down_generic,
3235 };
3236
3237 static const struct net_device_ops vxlan_netdev_raw_ops = {
3238 .ndo_init = vxlan_init,
3239 .ndo_uninit = vxlan_uninit,
3240 .ndo_open = vxlan_open,
3241 .ndo_stop = vxlan_stop,
3242 .ndo_start_xmit = vxlan_xmit,
3243 .ndo_get_stats64 = dev_get_tstats64,
3244 .ndo_change_mtu = vxlan_change_mtu,
3245 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
3246 };
3247
3248 /* Info for udev, that this is a virtual tunnel endpoint */
3249 static struct device_type vxlan_type = {
3250 .name = "vxlan",
3251 };
3252
3253 /* Calls the ndo_udp_tunnel_add of the caller in order to
3254 * supply the listening VXLAN udp ports. Callers are expected
3255 * to implement the ndo_udp_tunnel_add.
3256 */
vxlan_offload_rx_ports(struct net_device * dev,bool push)3257 static void vxlan_offload_rx_ports(struct net_device *dev, bool push)
3258 {
3259 struct vxlan_sock *vs;
3260 struct net *net = dev_net(dev);
3261 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3262 unsigned int i;
3263
3264 spin_lock(&vn->sock_lock);
3265 for (i = 0; i < PORT_HASH_SIZE; ++i) {
3266 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
3267 unsigned short type;
3268
3269 if (vs->flags & VXLAN_F_GPE)
3270 type = UDP_TUNNEL_TYPE_VXLAN_GPE;
3271 else
3272 type = UDP_TUNNEL_TYPE_VXLAN;
3273
3274 if (push)
3275 udp_tunnel_push_rx_port(dev, vs->sock, type);
3276 else
3277 udp_tunnel_drop_rx_port(dev, vs->sock, type);
3278 }
3279 }
3280 spin_unlock(&vn->sock_lock);
3281 }
3282
3283 /* Initialize the device structure. */
vxlan_setup(struct net_device * dev)3284 static void vxlan_setup(struct net_device *dev)
3285 {
3286 struct vxlan_dev *vxlan = netdev_priv(dev);
3287 unsigned int h;
3288
3289 eth_hw_addr_random(dev);
3290 ether_setup(dev);
3291
3292 dev->needs_free_netdev = true;
3293 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
3294
3295 dev->features |= NETIF_F_LLTX;
3296 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST;
3297 dev->features |= NETIF_F_RXCSUM;
3298 dev->features |= NETIF_F_GSO_SOFTWARE;
3299
3300 dev->vlan_features = dev->features;
3301 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST;
3302 dev->hw_features |= NETIF_F_RXCSUM;
3303 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
3304 netif_keep_dst(dev);
3305 dev->priv_flags |= IFF_NO_QUEUE;
3306
3307 /* MTU range: 68 - 65535 */
3308 dev->min_mtu = ETH_MIN_MTU;
3309 dev->max_mtu = ETH_MAX_MTU;
3310
3311 INIT_LIST_HEAD(&vxlan->next);
3312
3313 timer_setup(&vxlan->age_timer, vxlan_cleanup, TIMER_DEFERRABLE);
3314
3315 vxlan->dev = dev;
3316
3317 for (h = 0; h < FDB_HASH_SIZE; ++h) {
3318 spin_lock_init(&vxlan->hash_lock[h]);
3319 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
3320 }
3321 }
3322
vxlan_ether_setup(struct net_device * dev)3323 static void vxlan_ether_setup(struct net_device *dev)
3324 {
3325 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
3326 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
3327 dev->netdev_ops = &vxlan_netdev_ether_ops;
3328 }
3329
vxlan_raw_setup(struct net_device * dev)3330 static void vxlan_raw_setup(struct net_device *dev)
3331 {
3332 dev->header_ops = NULL;
3333 dev->type = ARPHRD_NONE;
3334 dev->hard_header_len = 0;
3335 dev->addr_len = 0;
3336 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
3337 dev->netdev_ops = &vxlan_netdev_raw_ops;
3338 }
3339
3340 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
3341 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
3342 [IFLA_VXLAN_GROUP] = { .len = sizeof_field(struct iphdr, daddr) },
3343 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
3344 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
3345 [IFLA_VXLAN_LOCAL] = { .len = sizeof_field(struct iphdr, saddr) },
3346 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
3347 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
3348 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
3349 [IFLA_VXLAN_LABEL] = { .type = NLA_U32 },
3350 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
3351 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
3352 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
3353 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
3354 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
3355 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
3356 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
3357 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
3358 [IFLA_VXLAN_COLLECT_METADATA] = { .type = NLA_U8 },
3359 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
3360 [IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 },
3361 [IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
3362 [IFLA_VXLAN_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
3363 [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
3364 [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
3365 [IFLA_VXLAN_GBP] = { .type = NLA_FLAG, },
3366 [IFLA_VXLAN_GPE] = { .type = NLA_FLAG, },
3367 [IFLA_VXLAN_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG },
3368 [IFLA_VXLAN_TTL_INHERIT] = { .type = NLA_FLAG },
3369 [IFLA_VXLAN_DF] = { .type = NLA_U8 },
3370 };
3371
vxlan_validate(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)3372 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[],
3373 struct netlink_ext_ack *extack)
3374 {
3375 if (tb[IFLA_ADDRESS]) {
3376 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
3377 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
3378 "Provided link layer address is not Ethernet");
3379 return -EINVAL;
3380 }
3381
3382 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
3383 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
3384 "Provided Ethernet address is not unicast");
3385 return -EADDRNOTAVAIL;
3386 }
3387 }
3388
3389 if (tb[IFLA_MTU]) {
3390 u32 mtu = nla_get_u32(tb[IFLA_MTU]);
3391
3392 if (mtu < ETH_MIN_MTU || mtu > ETH_MAX_MTU) {
3393 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU],
3394 "MTU must be between 68 and 65535");
3395 return -EINVAL;
3396 }
3397 }
3398
3399 if (!data) {
3400 NL_SET_ERR_MSG(extack,
3401 "Required attributes not provided to perform the operation");
3402 return -EINVAL;
3403 }
3404
3405 if (data[IFLA_VXLAN_ID]) {
3406 u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
3407
3408 if (id >= VXLAN_N_VID) {
3409 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_ID],
3410 "VXLAN ID must be lower than 16777216");
3411 return -ERANGE;
3412 }
3413 }
3414
3415 if (data[IFLA_VXLAN_PORT_RANGE]) {
3416 const struct ifla_vxlan_port_range *p
3417 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
3418
3419 if (ntohs(p->high) < ntohs(p->low)) {
3420 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_PORT_RANGE],
3421 "Invalid source port range");
3422 return -EINVAL;
3423 }
3424 }
3425
3426 if (data[IFLA_VXLAN_DF]) {
3427 enum ifla_vxlan_df df = nla_get_u8(data[IFLA_VXLAN_DF]);
3428
3429 if (df < 0 || df > VXLAN_DF_MAX) {
3430 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_DF],
3431 "Invalid DF attribute");
3432 return -EINVAL;
3433 }
3434 }
3435
3436 return 0;
3437 }
3438
vxlan_get_drvinfo(struct net_device * netdev,struct ethtool_drvinfo * drvinfo)3439 static void vxlan_get_drvinfo(struct net_device *netdev,
3440 struct ethtool_drvinfo *drvinfo)
3441 {
3442 strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
3443 strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
3444 }
3445
vxlan_get_link_ksettings(struct net_device * dev,struct ethtool_link_ksettings * cmd)3446 static int vxlan_get_link_ksettings(struct net_device *dev,
3447 struct ethtool_link_ksettings *cmd)
3448 {
3449 struct vxlan_dev *vxlan = netdev_priv(dev);
3450 struct vxlan_rdst *dst = &vxlan->default_dst;
3451 struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
3452 dst->remote_ifindex);
3453
3454 if (!lowerdev) {
3455 cmd->base.duplex = DUPLEX_UNKNOWN;
3456 cmd->base.port = PORT_OTHER;
3457 cmd->base.speed = SPEED_UNKNOWN;
3458
3459 return 0;
3460 }
3461
3462 return __ethtool_get_link_ksettings(lowerdev, cmd);
3463 }
3464
3465 static const struct ethtool_ops vxlan_ethtool_ops = {
3466 .get_drvinfo = vxlan_get_drvinfo,
3467 .get_link = ethtool_op_get_link,
3468 .get_link_ksettings = vxlan_get_link_ksettings,
3469 };
3470
vxlan_create_sock(struct net * net,bool ipv6,__be16 port,u32 flags,int ifindex)3471 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
3472 __be16 port, u32 flags, int ifindex)
3473 {
3474 struct socket *sock;
3475 struct udp_port_cfg udp_conf;
3476 int err;
3477
3478 memset(&udp_conf, 0, sizeof(udp_conf));
3479
3480 if (ipv6) {
3481 udp_conf.family = AF_INET6;
3482 udp_conf.use_udp6_rx_checksums =
3483 !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
3484 udp_conf.ipv6_v6only = 1;
3485 } else {
3486 udp_conf.family = AF_INET;
3487 }
3488
3489 udp_conf.local_udp_port = port;
3490 udp_conf.bind_ifindex = ifindex;
3491
3492 /* Open UDP socket */
3493 err = udp_sock_create(net, &udp_conf, &sock);
3494 if (err < 0)
3495 return ERR_PTR(err);
3496
3497 udp_allow_gso(sock->sk);
3498 return sock;
3499 }
3500
3501 /* Create new listen socket if needed */
vxlan_socket_create(struct net * net,bool ipv6,__be16 port,u32 flags,int ifindex)3502 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
3503 __be16 port, u32 flags,
3504 int ifindex)
3505 {
3506 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3507 struct vxlan_sock *vs;
3508 struct socket *sock;
3509 unsigned int h;
3510 struct udp_tunnel_sock_cfg tunnel_cfg;
3511
3512 vs = kzalloc(sizeof(*vs), GFP_KERNEL);
3513 if (!vs)
3514 return ERR_PTR(-ENOMEM);
3515
3516 for (h = 0; h < VNI_HASH_SIZE; ++h)
3517 INIT_HLIST_HEAD(&vs->vni_list[h]);
3518
3519 sock = vxlan_create_sock(net, ipv6, port, flags, ifindex);
3520 if (IS_ERR(sock)) {
3521 kfree(vs);
3522 return ERR_CAST(sock);
3523 }
3524
3525 vs->sock = sock;
3526 refcount_set(&vs->refcnt, 1);
3527 vs->flags = (flags & VXLAN_F_RCV_FLAGS);
3528
3529 spin_lock(&vn->sock_lock);
3530 hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
3531 udp_tunnel_notify_add_rx_port(sock,
3532 (vs->flags & VXLAN_F_GPE) ?
3533 UDP_TUNNEL_TYPE_VXLAN_GPE :
3534 UDP_TUNNEL_TYPE_VXLAN);
3535 spin_unlock(&vn->sock_lock);
3536
3537 /* Mark socket as an encapsulation socket. */
3538 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
3539 tunnel_cfg.sk_user_data = vs;
3540 tunnel_cfg.encap_type = 1;
3541 tunnel_cfg.encap_rcv = vxlan_rcv;
3542 tunnel_cfg.encap_err_lookup = vxlan_err_lookup;
3543 tunnel_cfg.encap_destroy = NULL;
3544 tunnel_cfg.gro_receive = vxlan_gro_receive;
3545 tunnel_cfg.gro_complete = vxlan_gro_complete;
3546
3547 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
3548
3549 return vs;
3550 }
3551
__vxlan_sock_add(struct vxlan_dev * vxlan,bool ipv6)3552 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
3553 {
3554 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
3555 struct vxlan_sock *vs = NULL;
3556 struct vxlan_dev_node *node;
3557 int l3mdev_index = 0;
3558
3559 if (vxlan->cfg.remote_ifindex)
3560 l3mdev_index = l3mdev_master_upper_ifindex_by_index(
3561 vxlan->net, vxlan->cfg.remote_ifindex);
3562
3563 if (!vxlan->cfg.no_share) {
3564 spin_lock(&vn->sock_lock);
3565 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
3566 vxlan->cfg.dst_port, vxlan->cfg.flags,
3567 l3mdev_index);
3568 if (vs && !refcount_inc_not_zero(&vs->refcnt)) {
3569 spin_unlock(&vn->sock_lock);
3570 return -EBUSY;
3571 }
3572 spin_unlock(&vn->sock_lock);
3573 }
3574 if (!vs)
3575 vs = vxlan_socket_create(vxlan->net, ipv6,
3576 vxlan->cfg.dst_port, vxlan->cfg.flags,
3577 l3mdev_index);
3578 if (IS_ERR(vs))
3579 return PTR_ERR(vs);
3580 #if IS_ENABLED(CONFIG_IPV6)
3581 if (ipv6) {
3582 rcu_assign_pointer(vxlan->vn6_sock, vs);
3583 node = &vxlan->hlist6;
3584 } else
3585 #endif
3586 {
3587 rcu_assign_pointer(vxlan->vn4_sock, vs);
3588 node = &vxlan->hlist4;
3589 }
3590 vxlan_vs_add_dev(vs, vxlan, node);
3591 return 0;
3592 }
3593
vxlan_sock_add(struct vxlan_dev * vxlan)3594 static int vxlan_sock_add(struct vxlan_dev *vxlan)
3595 {
3596 bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA;
3597 bool ipv6 = vxlan->cfg.flags & VXLAN_F_IPV6 || metadata;
3598 bool ipv4 = !ipv6 || metadata;
3599 int ret = 0;
3600
3601 RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
3602 #if IS_ENABLED(CONFIG_IPV6)
3603 RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
3604 if (ipv6) {
3605 ret = __vxlan_sock_add(vxlan, true);
3606 if (ret < 0 && ret != -EAFNOSUPPORT)
3607 ipv4 = false;
3608 }
3609 #endif
3610 if (ipv4)
3611 ret = __vxlan_sock_add(vxlan, false);
3612 if (ret < 0)
3613 vxlan_sock_release(vxlan);
3614 return ret;
3615 }
3616
vxlan_config_validate(struct net * src_net,struct vxlan_config * conf,struct net_device ** lower,struct vxlan_dev * old,struct netlink_ext_ack * extack)3617 static int vxlan_config_validate(struct net *src_net, struct vxlan_config *conf,
3618 struct net_device **lower,
3619 struct vxlan_dev *old,
3620 struct netlink_ext_ack *extack)
3621 {
3622 struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
3623 struct vxlan_dev *tmp;
3624 bool use_ipv6 = false;
3625
3626 if (conf->flags & VXLAN_F_GPE) {
3627 /* For now, allow GPE only together with
3628 * COLLECT_METADATA. This can be relaxed later; in such
3629 * case, the other side of the PtP link will have to be
3630 * provided.
3631 */
3632 if ((conf->flags & ~VXLAN_F_ALLOWED_GPE) ||
3633 !(conf->flags & VXLAN_F_COLLECT_METADATA)) {
3634 NL_SET_ERR_MSG(extack,
3635 "VXLAN GPE does not support this combination of attributes");
3636 return -EINVAL;
3637 }
3638 }
3639
3640 if (!conf->remote_ip.sa.sa_family && !conf->saddr.sa.sa_family) {
3641 /* Unless IPv6 is explicitly requested, assume IPv4 */
3642 conf->remote_ip.sa.sa_family = AF_INET;
3643 conf->saddr.sa.sa_family = AF_INET;
3644 } else if (!conf->remote_ip.sa.sa_family) {
3645 conf->remote_ip.sa.sa_family = conf->saddr.sa.sa_family;
3646 } else if (!conf->saddr.sa.sa_family) {
3647 conf->saddr.sa.sa_family = conf->remote_ip.sa.sa_family;
3648 }
3649
3650 if (conf->saddr.sa.sa_family != conf->remote_ip.sa.sa_family) {
3651 NL_SET_ERR_MSG(extack,
3652 "Local and remote address must be from the same family");
3653 return -EINVAL;
3654 }
3655
3656 if (vxlan_addr_multicast(&conf->saddr)) {
3657 NL_SET_ERR_MSG(extack, "Local address cannot be multicast");
3658 return -EINVAL;
3659 }
3660
3661 if (conf->saddr.sa.sa_family == AF_INET6) {
3662 if (!IS_ENABLED(CONFIG_IPV6)) {
3663 NL_SET_ERR_MSG(extack,
3664 "IPv6 support not enabled in the kernel");
3665 return -EPFNOSUPPORT;
3666 }
3667 use_ipv6 = true;
3668 conf->flags |= VXLAN_F_IPV6;
3669
3670 if (!(conf->flags & VXLAN_F_COLLECT_METADATA)) {
3671 int local_type =
3672 ipv6_addr_type(&conf->saddr.sin6.sin6_addr);
3673 int remote_type =
3674 ipv6_addr_type(&conf->remote_ip.sin6.sin6_addr);
3675
3676 if (local_type & IPV6_ADDR_LINKLOCAL) {
3677 if (!(remote_type & IPV6_ADDR_LINKLOCAL) &&
3678 (remote_type != IPV6_ADDR_ANY)) {
3679 NL_SET_ERR_MSG(extack,
3680 "Invalid combination of local and remote address scopes");
3681 return -EINVAL;
3682 }
3683
3684 conf->flags |= VXLAN_F_IPV6_LINKLOCAL;
3685 } else {
3686 if (remote_type ==
3687 (IPV6_ADDR_UNICAST | IPV6_ADDR_LINKLOCAL)) {
3688 NL_SET_ERR_MSG(extack,
3689 "Invalid combination of local and remote address scopes");
3690 return -EINVAL;
3691 }
3692
3693 conf->flags &= ~VXLAN_F_IPV6_LINKLOCAL;
3694 }
3695 }
3696 }
3697
3698 if (conf->label && !use_ipv6) {
3699 NL_SET_ERR_MSG(extack,
3700 "Label attribute only applies to IPv6 VXLAN devices");
3701 return -EINVAL;
3702 }
3703
3704 if (conf->remote_ifindex) {
3705 struct net_device *lowerdev;
3706
3707 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
3708 if (!lowerdev) {
3709 NL_SET_ERR_MSG(extack,
3710 "Invalid local interface, device not found");
3711 return -ENODEV;
3712 }
3713
3714 #if IS_ENABLED(CONFIG_IPV6)
3715 if (use_ipv6) {
3716 struct inet6_dev *idev = __in6_dev_get(lowerdev);
3717
3718 if (idev && idev->cnf.disable_ipv6) {
3719 NL_SET_ERR_MSG(extack,
3720 "IPv6 support disabled by administrator");
3721 return -EPERM;
3722 }
3723 }
3724 #endif
3725
3726 *lower = lowerdev;
3727 } else {
3728 if (vxlan_addr_multicast(&conf->remote_ip)) {
3729 NL_SET_ERR_MSG(extack,
3730 "Local interface required for multicast remote destination");
3731
3732 return -EINVAL;
3733 }
3734
3735 #if IS_ENABLED(CONFIG_IPV6)
3736 if (conf->flags & VXLAN_F_IPV6_LINKLOCAL) {
3737 NL_SET_ERR_MSG(extack,
3738 "Local interface required for link-local local/remote addresses");
3739 return -EINVAL;
3740 }
3741 #endif
3742
3743 *lower = NULL;
3744 }
3745
3746 if (!conf->dst_port) {
3747 if (conf->flags & VXLAN_F_GPE)
3748 conf->dst_port = htons(4790); /* IANA VXLAN-GPE port */
3749 else
3750 conf->dst_port = htons(vxlan_port);
3751 }
3752
3753 if (!conf->age_interval)
3754 conf->age_interval = FDB_AGE_DEFAULT;
3755
3756 list_for_each_entry(tmp, &vn->vxlan_list, next) {
3757 if (tmp == old)
3758 continue;
3759
3760 if (tmp->cfg.vni != conf->vni)
3761 continue;
3762 if (tmp->cfg.dst_port != conf->dst_port)
3763 continue;
3764 if ((tmp->cfg.flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)) !=
3765 (conf->flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)))
3766 continue;
3767
3768 if ((conf->flags & VXLAN_F_IPV6_LINKLOCAL) &&
3769 tmp->cfg.remote_ifindex != conf->remote_ifindex)
3770 continue;
3771
3772 NL_SET_ERR_MSG(extack,
3773 "A VXLAN device with the specified VNI already exists");
3774 return -EEXIST;
3775 }
3776
3777 return 0;
3778 }
3779
vxlan_config_apply(struct net_device * dev,struct vxlan_config * conf,struct net_device * lowerdev,struct net * src_net,bool changelink)3780 static void vxlan_config_apply(struct net_device *dev,
3781 struct vxlan_config *conf,
3782 struct net_device *lowerdev,
3783 struct net *src_net,
3784 bool changelink)
3785 {
3786 struct vxlan_dev *vxlan = netdev_priv(dev);
3787 struct vxlan_rdst *dst = &vxlan->default_dst;
3788 unsigned short needed_headroom = ETH_HLEN;
3789 bool use_ipv6 = !!(conf->flags & VXLAN_F_IPV6);
3790 int max_mtu = ETH_MAX_MTU;
3791
3792 if (!changelink) {
3793 if (conf->flags & VXLAN_F_GPE)
3794 vxlan_raw_setup(dev);
3795 else
3796 vxlan_ether_setup(dev);
3797
3798 if (conf->mtu)
3799 dev->mtu = conf->mtu;
3800
3801 vxlan->net = src_net;
3802 }
3803
3804 dst->remote_vni = conf->vni;
3805
3806 memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
3807
3808 if (lowerdev) {
3809 dst->remote_ifindex = conf->remote_ifindex;
3810
3811 dev->gso_max_size = lowerdev->gso_max_size;
3812 dev->gso_max_segs = lowerdev->gso_max_segs;
3813
3814 needed_headroom = lowerdev->hard_header_len;
3815 needed_headroom += lowerdev->needed_headroom;
3816
3817 dev->needed_tailroom = lowerdev->needed_tailroom;
3818
3819 max_mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM :
3820 VXLAN_HEADROOM);
3821 if (max_mtu < ETH_MIN_MTU)
3822 max_mtu = ETH_MIN_MTU;
3823
3824 if (!changelink && !conf->mtu)
3825 dev->mtu = max_mtu;
3826 }
3827
3828 if (dev->mtu > max_mtu)
3829 dev->mtu = max_mtu;
3830
3831 if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
3832 needed_headroom += VXLAN6_HEADROOM;
3833 else
3834 needed_headroom += VXLAN_HEADROOM;
3835 dev->needed_headroom = needed_headroom;
3836
3837 memcpy(&vxlan->cfg, conf, sizeof(*conf));
3838 }
3839
vxlan_dev_configure(struct net * src_net,struct net_device * dev,struct vxlan_config * conf,bool changelink,struct netlink_ext_ack * extack)3840 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
3841 struct vxlan_config *conf, bool changelink,
3842 struct netlink_ext_ack *extack)
3843 {
3844 struct vxlan_dev *vxlan = netdev_priv(dev);
3845 struct net_device *lowerdev;
3846 int ret;
3847
3848 ret = vxlan_config_validate(src_net, conf, &lowerdev, vxlan, extack);
3849 if (ret)
3850 return ret;
3851
3852 vxlan_config_apply(dev, conf, lowerdev, src_net, changelink);
3853
3854 return 0;
3855 }
3856
__vxlan_dev_create(struct net * net,struct net_device * dev,struct vxlan_config * conf,struct netlink_ext_ack * extack)3857 static int __vxlan_dev_create(struct net *net, struct net_device *dev,
3858 struct vxlan_config *conf,
3859 struct netlink_ext_ack *extack)
3860 {
3861 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3862 struct vxlan_dev *vxlan = netdev_priv(dev);
3863 struct net_device *remote_dev = NULL;
3864 struct vxlan_fdb *f = NULL;
3865 bool unregister = false;
3866 struct vxlan_rdst *dst;
3867 int err;
3868
3869 dst = &vxlan->default_dst;
3870 err = vxlan_dev_configure(net, dev, conf, false, extack);
3871 if (err)
3872 return err;
3873
3874 dev->ethtool_ops = &vxlan_ethtool_ops;
3875
3876 /* create an fdb entry for a valid default destination */
3877 if (!vxlan_addr_any(&dst->remote_ip)) {
3878 err = vxlan_fdb_create(vxlan, all_zeros_mac,
3879 &dst->remote_ip,
3880 NUD_REACHABLE | NUD_PERMANENT,
3881 vxlan->cfg.dst_port,
3882 dst->remote_vni,
3883 dst->remote_vni,
3884 dst->remote_ifindex,
3885 NTF_SELF, 0, &f, extack);
3886 if (err)
3887 return err;
3888 }
3889
3890 err = register_netdevice(dev);
3891 if (err)
3892 goto errout;
3893 unregister = true;
3894
3895 if (dst->remote_ifindex) {
3896 remote_dev = __dev_get_by_index(net, dst->remote_ifindex);
3897 if (!remote_dev) {
3898 err = -ENODEV;
3899 goto errout;
3900 }
3901
3902 err = netdev_upper_dev_link(remote_dev, dev, extack);
3903 if (err)
3904 goto errout;
3905 }
3906
3907 err = rtnl_configure_link(dev, NULL);
3908 if (err < 0)
3909 goto unlink;
3910
3911 if (f) {
3912 vxlan_fdb_insert(vxlan, all_zeros_mac, dst->remote_vni, f);
3913
3914 /* notify default fdb entry */
3915 err = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f),
3916 RTM_NEWNEIGH, true, extack);
3917 if (err) {
3918 vxlan_fdb_destroy(vxlan, f, false, false);
3919 if (remote_dev)
3920 netdev_upper_dev_unlink(remote_dev, dev);
3921 goto unregister;
3922 }
3923 }
3924
3925 list_add(&vxlan->next, &vn->vxlan_list);
3926 if (remote_dev)
3927 dst->remote_dev = remote_dev;
3928 return 0;
3929 unlink:
3930 if (remote_dev)
3931 netdev_upper_dev_unlink(remote_dev, dev);
3932 errout:
3933 /* unregister_netdevice() destroys the default FDB entry with deletion
3934 * notification. But the addition notification was not sent yet, so
3935 * destroy the entry by hand here.
3936 */
3937 if (f)
3938 __vxlan_fdb_free(f);
3939 unregister:
3940 if (unregister)
3941 unregister_netdevice(dev);
3942 return err;
3943 }
3944
3945 /* Set/clear flags based on attribute */
vxlan_nl2flag(struct vxlan_config * conf,struct nlattr * tb[],int attrtype,unsigned long mask,bool changelink,bool changelink_supported,struct netlink_ext_ack * extack)3946 static int vxlan_nl2flag(struct vxlan_config *conf, struct nlattr *tb[],
3947 int attrtype, unsigned long mask, bool changelink,
3948 bool changelink_supported,
3949 struct netlink_ext_ack *extack)
3950 {
3951 unsigned long flags;
3952
3953 if (!tb[attrtype])
3954 return 0;
3955
3956 if (changelink && !changelink_supported) {
3957 vxlan_flag_attr_error(attrtype, extack);
3958 return -EOPNOTSUPP;
3959 }
3960
3961 if (vxlan_policy[attrtype].type == NLA_FLAG)
3962 flags = conf->flags | mask;
3963 else if (nla_get_u8(tb[attrtype]))
3964 flags = conf->flags | mask;
3965 else
3966 flags = conf->flags & ~mask;
3967
3968 conf->flags = flags;
3969
3970 return 0;
3971 }
3972
vxlan_nl2conf(struct nlattr * tb[],struct nlattr * data[],struct net_device * dev,struct vxlan_config * conf,bool changelink,struct netlink_ext_ack * extack)3973 static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[],
3974 struct net_device *dev, struct vxlan_config *conf,
3975 bool changelink, struct netlink_ext_ack *extack)
3976 {
3977 struct vxlan_dev *vxlan = netdev_priv(dev);
3978 int err = 0;
3979
3980 memset(conf, 0, sizeof(*conf));
3981
3982 /* if changelink operation, start with old existing cfg */
3983 if (changelink)
3984 memcpy(conf, &vxlan->cfg, sizeof(*conf));
3985
3986 if (data[IFLA_VXLAN_ID]) {
3987 __be32 vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
3988
3989 if (changelink && (vni != conf->vni)) {
3990 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_ID], "Cannot change VNI");
3991 return -EOPNOTSUPP;
3992 }
3993 conf->vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
3994 }
3995
3996 if (data[IFLA_VXLAN_GROUP]) {
3997 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET)) {
3998 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP], "New group address family does not match old group");
3999 return -EOPNOTSUPP;
4000 }
4001
4002 conf->remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
4003 conf->remote_ip.sa.sa_family = AF_INET;
4004 } else if (data[IFLA_VXLAN_GROUP6]) {
4005 if (!IS_ENABLED(CONFIG_IPV6)) {
4006 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "IPv6 support not enabled in the kernel");
4007 return -EPFNOSUPPORT;
4008 }
4009
4010 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET6)) {
4011 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "New group address family does not match old group");
4012 return -EOPNOTSUPP;
4013 }
4014
4015 conf->remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
4016 conf->remote_ip.sa.sa_family = AF_INET6;
4017 }
4018
4019 if (data[IFLA_VXLAN_LOCAL]) {
4020 if (changelink && (conf->saddr.sa.sa_family != AF_INET)) {
4021 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL], "New local address family does not match old");
4022 return -EOPNOTSUPP;
4023 }
4024
4025 conf->saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
4026 conf->saddr.sa.sa_family = AF_INET;
4027 } else if (data[IFLA_VXLAN_LOCAL6]) {
4028 if (!IS_ENABLED(CONFIG_IPV6)) {
4029 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "IPv6 support not enabled in the kernel");
4030 return -EPFNOSUPPORT;
4031 }
4032
4033 if (changelink && (conf->saddr.sa.sa_family != AF_INET6)) {
4034 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "New local address family does not match old");
4035 return -EOPNOTSUPP;
4036 }
4037
4038 /* TODO: respect scope id */
4039 conf->saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
4040 conf->saddr.sa.sa_family = AF_INET6;
4041 }
4042
4043 if (data[IFLA_VXLAN_LINK])
4044 conf->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
4045
4046 if (data[IFLA_VXLAN_TOS])
4047 conf->tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
4048
4049 if (data[IFLA_VXLAN_TTL])
4050 conf->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
4051
4052 if (data[IFLA_VXLAN_TTL_INHERIT]) {
4053 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_TTL_INHERIT,
4054 VXLAN_F_TTL_INHERIT, changelink, false,
4055 extack);
4056 if (err)
4057 return err;
4058
4059 }
4060
4061 if (data[IFLA_VXLAN_LABEL])
4062 conf->label = nla_get_be32(data[IFLA_VXLAN_LABEL]) &
4063 IPV6_FLOWLABEL_MASK;
4064
4065 if (data[IFLA_VXLAN_LEARNING]) {
4066 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_LEARNING,
4067 VXLAN_F_LEARN, changelink, true,
4068 extack);
4069 if (err)
4070 return err;
4071 } else if (!changelink) {
4072 /* default to learn on a new device */
4073 conf->flags |= VXLAN_F_LEARN;
4074 }
4075
4076 if (data[IFLA_VXLAN_AGEING])
4077 conf->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
4078
4079 if (data[IFLA_VXLAN_PROXY]) {
4080 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_PROXY,
4081 VXLAN_F_PROXY, changelink, false,
4082 extack);
4083 if (err)
4084 return err;
4085 }
4086
4087 if (data[IFLA_VXLAN_RSC]) {
4088 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_RSC,
4089 VXLAN_F_RSC, changelink, false,
4090 extack);
4091 if (err)
4092 return err;
4093 }
4094
4095 if (data[IFLA_VXLAN_L2MISS]) {
4096 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L2MISS,
4097 VXLAN_F_L2MISS, changelink, false,
4098 extack);
4099 if (err)
4100 return err;
4101 }
4102
4103 if (data[IFLA_VXLAN_L3MISS]) {
4104 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L3MISS,
4105 VXLAN_F_L3MISS, changelink, false,
4106 extack);
4107 if (err)
4108 return err;
4109 }
4110
4111 if (data[IFLA_VXLAN_LIMIT]) {
4112 if (changelink) {
4113 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LIMIT],
4114 "Cannot change limit");
4115 return -EOPNOTSUPP;
4116 }
4117 conf->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
4118 }
4119
4120 if (data[IFLA_VXLAN_COLLECT_METADATA]) {
4121 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_COLLECT_METADATA,
4122 VXLAN_F_COLLECT_METADATA, changelink, false,
4123 extack);
4124 if (err)
4125 return err;
4126 }
4127
4128 if (data[IFLA_VXLAN_PORT_RANGE]) {
4129 if (!changelink) {
4130 const struct ifla_vxlan_port_range *p
4131 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
4132 conf->port_min = ntohs(p->low);
4133 conf->port_max = ntohs(p->high);
4134 } else {
4135 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT_RANGE],
4136 "Cannot change port range");
4137 return -EOPNOTSUPP;
4138 }
4139 }
4140
4141 if (data[IFLA_VXLAN_PORT]) {
4142 if (changelink) {
4143 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT],
4144 "Cannot change port");
4145 return -EOPNOTSUPP;
4146 }
4147 conf->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
4148 }
4149
4150 if (data[IFLA_VXLAN_UDP_CSUM]) {
4151 if (changelink) {
4152 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_UDP_CSUM],
4153 "Cannot change UDP_CSUM flag");
4154 return -EOPNOTSUPP;
4155 }
4156 if (!nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
4157 conf->flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
4158 }
4159
4160 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]) {
4161 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
4162 VXLAN_F_UDP_ZERO_CSUM6_TX, changelink,
4163 false, extack);
4164 if (err)
4165 return err;
4166 }
4167
4168 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]) {
4169 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
4170 VXLAN_F_UDP_ZERO_CSUM6_RX, changelink,
4171 false, extack);
4172 if (err)
4173 return err;
4174 }
4175
4176 if (data[IFLA_VXLAN_REMCSUM_TX]) {
4177 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_TX,
4178 VXLAN_F_REMCSUM_TX, changelink, false,
4179 extack);
4180 if (err)
4181 return err;
4182 }
4183
4184 if (data[IFLA_VXLAN_REMCSUM_RX]) {
4185 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_RX,
4186 VXLAN_F_REMCSUM_RX, changelink, false,
4187 extack);
4188 if (err)
4189 return err;
4190 }
4191
4192 if (data[IFLA_VXLAN_GBP]) {
4193 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GBP,
4194 VXLAN_F_GBP, changelink, false, extack);
4195 if (err)
4196 return err;
4197 }
4198
4199 if (data[IFLA_VXLAN_GPE]) {
4200 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GPE,
4201 VXLAN_F_GPE, changelink, false,
4202 extack);
4203 if (err)
4204 return err;
4205 }
4206
4207 if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL]) {
4208 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_NOPARTIAL,
4209 VXLAN_F_REMCSUM_NOPARTIAL, changelink,
4210 false, extack);
4211 if (err)
4212 return err;
4213 }
4214
4215 if (tb[IFLA_MTU]) {
4216 if (changelink) {
4217 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU],
4218 "Cannot change mtu");
4219 return -EOPNOTSUPP;
4220 }
4221 conf->mtu = nla_get_u32(tb[IFLA_MTU]);
4222 }
4223
4224 if (data[IFLA_VXLAN_DF])
4225 conf->df = nla_get_u8(data[IFLA_VXLAN_DF]);
4226
4227 return 0;
4228 }
4229
vxlan_newlink(struct net * src_net,struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)4230 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
4231 struct nlattr *tb[], struct nlattr *data[],
4232 struct netlink_ext_ack *extack)
4233 {
4234 struct vxlan_config conf;
4235 int err;
4236
4237 err = vxlan_nl2conf(tb, data, dev, &conf, false, extack);
4238 if (err)
4239 return err;
4240
4241 return __vxlan_dev_create(src_net, dev, &conf, extack);
4242 }
4243
vxlan_changelink(struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)4244 static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[],
4245 struct nlattr *data[],
4246 struct netlink_ext_ack *extack)
4247 {
4248 struct vxlan_dev *vxlan = netdev_priv(dev);
4249 struct net_device *lowerdev;
4250 struct vxlan_config conf;
4251 struct vxlan_rdst *dst;
4252 int err;
4253
4254 dst = &vxlan->default_dst;
4255 err = vxlan_nl2conf(tb, data, dev, &conf, true, extack);
4256 if (err)
4257 return err;
4258
4259 err = vxlan_config_validate(vxlan->net, &conf, &lowerdev,
4260 vxlan, extack);
4261 if (err)
4262 return err;
4263
4264 if (dst->remote_dev == lowerdev)
4265 lowerdev = NULL;
4266
4267 err = netdev_adjacent_change_prepare(dst->remote_dev, lowerdev, dev,
4268 extack);
4269 if (err)
4270 return err;
4271
4272 /* handle default dst entry */
4273 if (!vxlan_addr_equal(&conf.remote_ip, &dst->remote_ip)) {
4274 u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, conf.vni);
4275
4276 spin_lock_bh(&vxlan->hash_lock[hash_index]);
4277 if (!vxlan_addr_any(&conf.remote_ip)) {
4278 err = vxlan_fdb_update(vxlan, all_zeros_mac,
4279 &conf.remote_ip,
4280 NUD_REACHABLE | NUD_PERMANENT,
4281 NLM_F_APPEND | NLM_F_CREATE,
4282 vxlan->cfg.dst_port,
4283 conf.vni, conf.vni,
4284 conf.remote_ifindex,
4285 NTF_SELF, 0, true, extack);
4286 if (err) {
4287 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4288 netdev_adjacent_change_abort(dst->remote_dev,
4289 lowerdev, dev);
4290 return err;
4291 }
4292 }
4293 if (!vxlan_addr_any(&dst->remote_ip))
4294 __vxlan_fdb_delete(vxlan, all_zeros_mac,
4295 dst->remote_ip,
4296 vxlan->cfg.dst_port,
4297 dst->remote_vni,
4298 dst->remote_vni,
4299 dst->remote_ifindex,
4300 true);
4301 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4302 }
4303
4304 if (conf.age_interval != vxlan->cfg.age_interval)
4305 mod_timer(&vxlan->age_timer, jiffies);
4306
4307 netdev_adjacent_change_commit(dst->remote_dev, lowerdev, dev);
4308 if (lowerdev && lowerdev != dst->remote_dev)
4309 dst->remote_dev = lowerdev;
4310 vxlan_config_apply(dev, &conf, lowerdev, vxlan->net, true);
4311 return 0;
4312 }
4313
vxlan_dellink(struct net_device * dev,struct list_head * head)4314 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
4315 {
4316 struct vxlan_dev *vxlan = netdev_priv(dev);
4317
4318 vxlan_flush(vxlan, true);
4319
4320 list_del(&vxlan->next);
4321 unregister_netdevice_queue(dev, head);
4322 if (vxlan->default_dst.remote_dev)
4323 netdev_upper_dev_unlink(vxlan->default_dst.remote_dev, dev);
4324 }
4325
vxlan_get_size(const struct net_device * dev)4326 static size_t vxlan_get_size(const struct net_device *dev)
4327 {
4328
4329 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
4330 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
4331 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
4332 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
4333 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
4334 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL_INHERIT */
4335 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
4336 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_DF */
4337 nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */
4338 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
4339 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
4340 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
4341 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
4342 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
4343 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_COLLECT_METADATA */
4344 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
4345 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
4346 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
4347 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
4348 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
4349 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
4350 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
4351 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
4352 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
4353 0;
4354 }
4355
vxlan_fill_info(struct sk_buff * skb,const struct net_device * dev)4356 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
4357 {
4358 const struct vxlan_dev *vxlan = netdev_priv(dev);
4359 const struct vxlan_rdst *dst = &vxlan->default_dst;
4360 struct ifla_vxlan_port_range ports = {
4361 .low = htons(vxlan->cfg.port_min),
4362 .high = htons(vxlan->cfg.port_max),
4363 };
4364
4365 if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni)))
4366 goto nla_put_failure;
4367
4368 if (!vxlan_addr_any(&dst->remote_ip)) {
4369 if (dst->remote_ip.sa.sa_family == AF_INET) {
4370 if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
4371 dst->remote_ip.sin.sin_addr.s_addr))
4372 goto nla_put_failure;
4373 #if IS_ENABLED(CONFIG_IPV6)
4374 } else {
4375 if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
4376 &dst->remote_ip.sin6.sin6_addr))
4377 goto nla_put_failure;
4378 #endif
4379 }
4380 }
4381
4382 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
4383 goto nla_put_failure;
4384
4385 if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
4386 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
4387 if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
4388 vxlan->cfg.saddr.sin.sin_addr.s_addr))
4389 goto nla_put_failure;
4390 #if IS_ENABLED(CONFIG_IPV6)
4391 } else {
4392 if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
4393 &vxlan->cfg.saddr.sin6.sin6_addr))
4394 goto nla_put_failure;
4395 #endif
4396 }
4397 }
4398
4399 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
4400 nla_put_u8(skb, IFLA_VXLAN_TTL_INHERIT,
4401 !!(vxlan->cfg.flags & VXLAN_F_TTL_INHERIT)) ||
4402 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
4403 nla_put_u8(skb, IFLA_VXLAN_DF, vxlan->cfg.df) ||
4404 nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) ||
4405 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
4406 !!(vxlan->cfg.flags & VXLAN_F_LEARN)) ||
4407 nla_put_u8(skb, IFLA_VXLAN_PROXY,
4408 !!(vxlan->cfg.flags & VXLAN_F_PROXY)) ||
4409 nla_put_u8(skb, IFLA_VXLAN_RSC,
4410 !!(vxlan->cfg.flags & VXLAN_F_RSC)) ||
4411 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
4412 !!(vxlan->cfg.flags & VXLAN_F_L2MISS)) ||
4413 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
4414 !!(vxlan->cfg.flags & VXLAN_F_L3MISS)) ||
4415 nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
4416 !!(vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)) ||
4417 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
4418 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
4419 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
4420 nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
4421 !(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
4422 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
4423 !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
4424 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
4425 !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
4426 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
4427 !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_TX)) ||
4428 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
4429 !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_RX)))
4430 goto nla_put_failure;
4431
4432 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
4433 goto nla_put_failure;
4434
4435 if (vxlan->cfg.flags & VXLAN_F_GBP &&
4436 nla_put_flag(skb, IFLA_VXLAN_GBP))
4437 goto nla_put_failure;
4438
4439 if (vxlan->cfg.flags & VXLAN_F_GPE &&
4440 nla_put_flag(skb, IFLA_VXLAN_GPE))
4441 goto nla_put_failure;
4442
4443 if (vxlan->cfg.flags & VXLAN_F_REMCSUM_NOPARTIAL &&
4444 nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
4445 goto nla_put_failure;
4446
4447 return 0;
4448
4449 nla_put_failure:
4450 return -EMSGSIZE;
4451 }
4452
vxlan_get_link_net(const struct net_device * dev)4453 static struct net *vxlan_get_link_net(const struct net_device *dev)
4454 {
4455 struct vxlan_dev *vxlan = netdev_priv(dev);
4456
4457 return vxlan->net;
4458 }
4459
4460 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
4461 .kind = "vxlan",
4462 .maxtype = IFLA_VXLAN_MAX,
4463 .policy = vxlan_policy,
4464 .priv_size = sizeof(struct vxlan_dev),
4465 .setup = vxlan_setup,
4466 .validate = vxlan_validate,
4467 .newlink = vxlan_newlink,
4468 .changelink = vxlan_changelink,
4469 .dellink = vxlan_dellink,
4470 .get_size = vxlan_get_size,
4471 .fill_info = vxlan_fill_info,
4472 .get_link_net = vxlan_get_link_net,
4473 };
4474
vxlan_dev_create(struct net * net,const char * name,u8 name_assign_type,struct vxlan_config * conf)4475 struct net_device *vxlan_dev_create(struct net *net, const char *name,
4476 u8 name_assign_type,
4477 struct vxlan_config *conf)
4478 {
4479 struct nlattr *tb[IFLA_MAX + 1];
4480 struct net_device *dev;
4481 int err;
4482
4483 memset(&tb, 0, sizeof(tb));
4484
4485 dev = rtnl_create_link(net, name, name_assign_type,
4486 &vxlan_link_ops, tb, NULL);
4487 if (IS_ERR(dev))
4488 return dev;
4489
4490 err = __vxlan_dev_create(net, dev, conf, NULL);
4491 if (err < 0) {
4492 free_netdev(dev);
4493 return ERR_PTR(err);
4494 }
4495
4496 err = rtnl_configure_link(dev, NULL);
4497 if (err < 0) {
4498 LIST_HEAD(list_kill);
4499
4500 vxlan_dellink(dev, &list_kill);
4501 unregister_netdevice_many(&list_kill);
4502 return ERR_PTR(err);
4503 }
4504
4505 return dev;
4506 }
4507 EXPORT_SYMBOL_GPL(vxlan_dev_create);
4508
vxlan_handle_lowerdev_unregister(struct vxlan_net * vn,struct net_device * dev)4509 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
4510 struct net_device *dev)
4511 {
4512 struct vxlan_dev *vxlan, *next;
4513 LIST_HEAD(list_kill);
4514
4515 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
4516 struct vxlan_rdst *dst = &vxlan->default_dst;
4517
4518 /* In case we created vxlan device with carrier
4519 * and we loose the carrier due to module unload
4520 * we also need to remove vxlan device. In other
4521 * cases, it's not necessary and remote_ifindex
4522 * is 0 here, so no matches.
4523 */
4524 if (dst->remote_ifindex == dev->ifindex)
4525 vxlan_dellink(vxlan->dev, &list_kill);
4526 }
4527
4528 unregister_netdevice_many(&list_kill);
4529 }
4530
vxlan_netdevice_event(struct notifier_block * unused,unsigned long event,void * ptr)4531 static int vxlan_netdevice_event(struct notifier_block *unused,
4532 unsigned long event, void *ptr)
4533 {
4534 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4535 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
4536
4537 if (event == NETDEV_UNREGISTER)
4538 vxlan_handle_lowerdev_unregister(vn, dev);
4539 else if (event == NETDEV_UDP_TUNNEL_PUSH_INFO)
4540 vxlan_offload_rx_ports(dev, true);
4541 else if (event == NETDEV_UDP_TUNNEL_DROP_INFO)
4542 vxlan_offload_rx_ports(dev, false);
4543
4544 return NOTIFY_DONE;
4545 }
4546
4547 static struct notifier_block vxlan_notifier_block __read_mostly = {
4548 .notifier_call = vxlan_netdevice_event,
4549 };
4550
4551 static void
vxlan_fdb_offloaded_set(struct net_device * dev,struct switchdev_notifier_vxlan_fdb_info * fdb_info)4552 vxlan_fdb_offloaded_set(struct net_device *dev,
4553 struct switchdev_notifier_vxlan_fdb_info *fdb_info)
4554 {
4555 struct vxlan_dev *vxlan = netdev_priv(dev);
4556 struct vxlan_rdst *rdst;
4557 struct vxlan_fdb *f;
4558 u32 hash_index;
4559
4560 hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
4561
4562 spin_lock_bh(&vxlan->hash_lock[hash_index]);
4563
4564 f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni);
4565 if (!f)
4566 goto out;
4567
4568 rdst = vxlan_fdb_find_rdst(f, &fdb_info->remote_ip,
4569 fdb_info->remote_port,
4570 fdb_info->remote_vni,
4571 fdb_info->remote_ifindex);
4572 if (!rdst)
4573 goto out;
4574
4575 rdst->offloaded = fdb_info->offloaded;
4576
4577 out:
4578 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4579 }
4580
4581 static int
vxlan_fdb_external_learn_add(struct net_device * dev,struct switchdev_notifier_vxlan_fdb_info * fdb_info)4582 vxlan_fdb_external_learn_add(struct net_device *dev,
4583 struct switchdev_notifier_vxlan_fdb_info *fdb_info)
4584 {
4585 struct vxlan_dev *vxlan = netdev_priv(dev);
4586 struct netlink_ext_ack *extack;
4587 u32 hash_index;
4588 int err;
4589
4590 hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
4591 extack = switchdev_notifier_info_to_extack(&fdb_info->info);
4592
4593 spin_lock_bh(&vxlan->hash_lock[hash_index]);
4594 err = vxlan_fdb_update(vxlan, fdb_info->eth_addr, &fdb_info->remote_ip,
4595 NUD_REACHABLE,
4596 NLM_F_CREATE | NLM_F_REPLACE,
4597 fdb_info->remote_port,
4598 fdb_info->vni,
4599 fdb_info->remote_vni,
4600 fdb_info->remote_ifindex,
4601 NTF_USE | NTF_SELF | NTF_EXT_LEARNED,
4602 0, false, extack);
4603 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4604
4605 return err;
4606 }
4607
4608 static int
vxlan_fdb_external_learn_del(struct net_device * dev,struct switchdev_notifier_vxlan_fdb_info * fdb_info)4609 vxlan_fdb_external_learn_del(struct net_device *dev,
4610 struct switchdev_notifier_vxlan_fdb_info *fdb_info)
4611 {
4612 struct vxlan_dev *vxlan = netdev_priv(dev);
4613 struct vxlan_fdb *f;
4614 u32 hash_index;
4615 int err = 0;
4616
4617 hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
4618 spin_lock_bh(&vxlan->hash_lock[hash_index]);
4619
4620 f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni);
4621 if (!f)
4622 err = -ENOENT;
4623 else if (f->flags & NTF_EXT_LEARNED)
4624 err = __vxlan_fdb_delete(vxlan, fdb_info->eth_addr,
4625 fdb_info->remote_ip,
4626 fdb_info->remote_port,
4627 fdb_info->vni,
4628 fdb_info->remote_vni,
4629 fdb_info->remote_ifindex,
4630 false);
4631
4632 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4633
4634 return err;
4635 }
4636
vxlan_switchdev_event(struct notifier_block * unused,unsigned long event,void * ptr)4637 static int vxlan_switchdev_event(struct notifier_block *unused,
4638 unsigned long event, void *ptr)
4639 {
4640 struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
4641 struct switchdev_notifier_vxlan_fdb_info *fdb_info;
4642 int err = 0;
4643
4644 switch (event) {
4645 case SWITCHDEV_VXLAN_FDB_OFFLOADED:
4646 vxlan_fdb_offloaded_set(dev, ptr);
4647 break;
4648 case SWITCHDEV_VXLAN_FDB_ADD_TO_BRIDGE:
4649 fdb_info = ptr;
4650 err = vxlan_fdb_external_learn_add(dev, fdb_info);
4651 if (err) {
4652 err = notifier_from_errno(err);
4653 break;
4654 }
4655 fdb_info->offloaded = true;
4656 vxlan_fdb_offloaded_set(dev, fdb_info);
4657 break;
4658 case SWITCHDEV_VXLAN_FDB_DEL_TO_BRIDGE:
4659 fdb_info = ptr;
4660 err = vxlan_fdb_external_learn_del(dev, fdb_info);
4661 if (err) {
4662 err = notifier_from_errno(err);
4663 break;
4664 }
4665 fdb_info->offloaded = false;
4666 vxlan_fdb_offloaded_set(dev, fdb_info);
4667 break;
4668 }
4669
4670 return err;
4671 }
4672
4673 static struct notifier_block vxlan_switchdev_notifier_block __read_mostly = {
4674 .notifier_call = vxlan_switchdev_event,
4675 };
4676
vxlan_fdb_nh_flush(struct nexthop * nh)4677 static void vxlan_fdb_nh_flush(struct nexthop *nh)
4678 {
4679 struct vxlan_fdb *fdb;
4680 struct vxlan_dev *vxlan;
4681 u32 hash_index;
4682
4683 rcu_read_lock();
4684 list_for_each_entry_rcu(fdb, &nh->fdb_list, nh_list) {
4685 vxlan = rcu_dereference(fdb->vdev);
4686 WARN_ON(!vxlan);
4687 hash_index = fdb_head_index(vxlan, fdb->eth_addr,
4688 vxlan->default_dst.remote_vni);
4689 spin_lock_bh(&vxlan->hash_lock[hash_index]);
4690 if (!hlist_unhashed(&fdb->hlist))
4691 vxlan_fdb_destroy(vxlan, fdb, false, false);
4692 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4693 }
4694 rcu_read_unlock();
4695 }
4696
vxlan_nexthop_event(struct notifier_block * nb,unsigned long event,void * ptr)4697 static int vxlan_nexthop_event(struct notifier_block *nb,
4698 unsigned long event, void *ptr)
4699 {
4700 struct nh_notifier_info *info = ptr;
4701 struct nexthop *nh;
4702
4703 if (event != NEXTHOP_EVENT_DEL)
4704 return NOTIFY_DONE;
4705
4706 nh = nexthop_find_by_id(info->net, info->id);
4707 if (!nh)
4708 return NOTIFY_DONE;
4709
4710 vxlan_fdb_nh_flush(nh);
4711
4712 return NOTIFY_DONE;
4713 }
4714
vxlan_init_net(struct net * net)4715 static __net_init int vxlan_init_net(struct net *net)
4716 {
4717 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
4718 unsigned int h;
4719
4720 INIT_LIST_HEAD(&vn->vxlan_list);
4721 spin_lock_init(&vn->sock_lock);
4722 vn->nexthop_notifier_block.notifier_call = vxlan_nexthop_event;
4723
4724 for (h = 0; h < PORT_HASH_SIZE; ++h)
4725 INIT_HLIST_HEAD(&vn->sock_list[h]);
4726
4727 return register_nexthop_notifier(net, &vn->nexthop_notifier_block,
4728 NULL);
4729 }
4730
vxlan_destroy_tunnels(struct net * net,struct list_head * head)4731 static void vxlan_destroy_tunnels(struct net *net, struct list_head *head)
4732 {
4733 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
4734 struct vxlan_dev *vxlan, *next;
4735 struct net_device *dev, *aux;
4736
4737 for_each_netdev_safe(net, dev, aux)
4738 if (dev->rtnl_link_ops == &vxlan_link_ops)
4739 unregister_netdevice_queue(dev, head);
4740
4741 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
4742 /* If vxlan->dev is in the same netns, it has already been added
4743 * to the list by the previous loop.
4744 */
4745 if (!net_eq(dev_net(vxlan->dev), net))
4746 unregister_netdevice_queue(vxlan->dev, head);
4747 }
4748
4749 }
4750
vxlan_exit_batch_net(struct list_head * net_list)4751 static void __net_exit vxlan_exit_batch_net(struct list_head *net_list)
4752 {
4753 struct net *net;
4754 LIST_HEAD(list);
4755 unsigned int h;
4756
4757 rtnl_lock();
4758 list_for_each_entry(net, net_list, exit_list) {
4759 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
4760
4761 unregister_nexthop_notifier(net, &vn->nexthop_notifier_block);
4762 }
4763 list_for_each_entry(net, net_list, exit_list)
4764 vxlan_destroy_tunnels(net, &list);
4765
4766 unregister_netdevice_many(&list);
4767 rtnl_unlock();
4768
4769 list_for_each_entry(net, net_list, exit_list) {
4770 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
4771
4772 for (h = 0; h < PORT_HASH_SIZE; ++h)
4773 WARN_ON_ONCE(!hlist_empty(&vn->sock_list[h]));
4774 }
4775 }
4776
4777 static struct pernet_operations vxlan_net_ops = {
4778 .init = vxlan_init_net,
4779 .exit_batch = vxlan_exit_batch_net,
4780 .id = &vxlan_net_id,
4781 .size = sizeof(struct vxlan_net),
4782 };
4783
vxlan_init_module(void)4784 static int __init vxlan_init_module(void)
4785 {
4786 int rc;
4787
4788 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
4789
4790 rc = register_pernet_subsys(&vxlan_net_ops);
4791 if (rc)
4792 goto out1;
4793
4794 rc = register_netdevice_notifier(&vxlan_notifier_block);
4795 if (rc)
4796 goto out2;
4797
4798 rc = register_switchdev_notifier(&vxlan_switchdev_notifier_block);
4799 if (rc)
4800 goto out3;
4801
4802 rc = rtnl_link_register(&vxlan_link_ops);
4803 if (rc)
4804 goto out4;
4805
4806 return 0;
4807 out4:
4808 unregister_switchdev_notifier(&vxlan_switchdev_notifier_block);
4809 out3:
4810 unregister_netdevice_notifier(&vxlan_notifier_block);
4811 out2:
4812 unregister_pernet_subsys(&vxlan_net_ops);
4813 out1:
4814 return rc;
4815 }
4816 late_initcall(vxlan_init_module);
4817
vxlan_cleanup_module(void)4818 static void __exit vxlan_cleanup_module(void)
4819 {
4820 rtnl_link_unregister(&vxlan_link_ops);
4821 unregister_switchdev_notifier(&vxlan_switchdev_notifier_block);
4822 unregister_netdevice_notifier(&vxlan_notifier_block);
4823 unregister_pernet_subsys(&vxlan_net_ops);
4824 /* rcu_barrier() is called by netns */
4825 }
4826 module_exit(vxlan_cleanup_module);
4827
4828 MODULE_LICENSE("GPL");
4829 MODULE_VERSION(VXLAN_VERSION);
4830 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
4831 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
4832 MODULE_ALIAS_RTNL_LINK("vxlan");
4833