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/gro.h>
21 #include <net/ipv6_stubs.h>
22 #include <net/ip.h>
23 #include <net/icmp.h>
24 #include <net/rtnetlink.h>
25 #include <net/inet_ecn.h>
26 #include <net/net_namespace.h>
27 #include <net/netns/generic.h>
28 #include <net/tun_proto.h>
29 #include <net/vxlan.h>
30 #include <net/nexthop.h>
31
32 #if IS_ENABLED(CONFIG_IPV6)
33 #include <net/ip6_tunnel.h>
34 #include <net/ip6_checksum.h>
35 #endif
36
37 #include "vxlan_private.h"
38
39 #define VXLAN_VERSION "0.1"
40
41 #define FDB_AGE_DEFAULT 300 /* 5 min */
42 #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
43
44 /* UDP port for VXLAN traffic.
45 * The IANA assigned port is 4789, but the Linux default is 8472
46 * for compatibility with early adopters.
47 */
48 static unsigned short vxlan_port __read_mostly = 8472;
49 module_param_named(udp_port, vxlan_port, ushort, 0444);
50 MODULE_PARM_DESC(udp_port, "Destination UDP port");
51
52 static bool log_ecn_error = true;
53 module_param(log_ecn_error, bool, 0644);
54 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
55
56 unsigned int vxlan_net_id;
57
58 const u8 all_zeros_mac[ETH_ALEN + 2];
59 static struct rtnl_link_ops vxlan_link_ops;
60
61 static int vxlan_sock_add(struct vxlan_dev *vxlan);
62
63 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan);
64
65 /* salt for hash table */
66 static u32 vxlan_salt __read_mostly;
67
vxlan_collect_metadata(struct vxlan_sock * vs)68 static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
69 {
70 return vs->flags & VXLAN_F_COLLECT_METADATA ||
71 ip_tunnel_collect_metadata();
72 }
73
74 /* Find VXLAN socket based on network namespace, address family, UDP port,
75 * enabled unshareable flags and socket device binding (see l3mdev with
76 * non-default VRF).
77 */
vxlan_find_sock(struct net * net,sa_family_t family,__be16 port,u32 flags,int ifindex)78 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
79 __be16 port, u32 flags, int ifindex)
80 {
81 struct vxlan_sock *vs;
82
83 flags &= VXLAN_F_RCV_FLAGS;
84
85 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
86 if (inet_sk(vs->sock->sk)->inet_sport == port &&
87 vxlan_get_sk_family(vs) == family &&
88 vs->flags == flags &&
89 vs->sock->sk->sk_bound_dev_if == ifindex)
90 return vs;
91 }
92 return NULL;
93 }
94
vxlan_vs_find_vni(struct vxlan_sock * vs,int ifindex,__be32 vni,struct vxlan_vni_node ** vninode)95 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs,
96 int ifindex, __be32 vni,
97 struct vxlan_vni_node **vninode)
98 {
99 struct vxlan_vni_node *vnode;
100 struct vxlan_dev_node *node;
101
102 /* For flow based devices, map all packets to VNI 0 */
103 if (vs->flags & VXLAN_F_COLLECT_METADATA &&
104 !(vs->flags & VXLAN_F_VNIFILTER))
105 vni = 0;
106
107 hlist_for_each_entry_rcu(node, vni_head(vs, vni), hlist) {
108 if (!node->vxlan)
109 continue;
110 vnode = NULL;
111 if (node->vxlan->cfg.flags & VXLAN_F_VNIFILTER) {
112 vnode = vxlan_vnifilter_lookup(node->vxlan, vni);
113 if (!vnode)
114 continue;
115 } else if (node->vxlan->default_dst.remote_vni != vni) {
116 continue;
117 }
118
119 if (IS_ENABLED(CONFIG_IPV6)) {
120 const struct vxlan_config *cfg = &node->vxlan->cfg;
121
122 if ((cfg->flags & VXLAN_F_IPV6_LINKLOCAL) &&
123 cfg->remote_ifindex != ifindex)
124 continue;
125 }
126
127 if (vninode)
128 *vninode = vnode;
129 return node->vxlan;
130 }
131
132 return NULL;
133 }
134
135 /* 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)136 static struct vxlan_dev *vxlan_find_vni(struct net *net, int ifindex,
137 __be32 vni, sa_family_t family,
138 __be16 port, u32 flags)
139 {
140 struct vxlan_sock *vs;
141
142 vs = vxlan_find_sock(net, family, port, flags, ifindex);
143 if (!vs)
144 return NULL;
145
146 return vxlan_vs_find_vni(vs, ifindex, vni, NULL);
147 }
148
149 /* 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)150 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
151 const struct vxlan_fdb *fdb,
152 u32 portid, u32 seq, int type, unsigned int flags,
153 const struct vxlan_rdst *rdst)
154 {
155 unsigned long now = jiffies;
156 struct nda_cacheinfo ci;
157 bool send_ip, send_eth;
158 struct nlmsghdr *nlh;
159 struct nexthop *nh;
160 struct ndmsg *ndm;
161 int nh_family;
162 u32 nh_id;
163
164 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
165 if (nlh == NULL)
166 return -EMSGSIZE;
167
168 ndm = nlmsg_data(nlh);
169 memset(ndm, 0, sizeof(*ndm));
170
171 send_eth = send_ip = true;
172
173 rcu_read_lock();
174 nh = rcu_dereference(fdb->nh);
175 if (nh) {
176 nh_family = nexthop_get_family(nh);
177 nh_id = nh->id;
178 }
179 rcu_read_unlock();
180
181 if (type == RTM_GETNEIGH) {
182 if (rdst) {
183 send_ip = !vxlan_addr_any(&rdst->remote_ip);
184 ndm->ndm_family = send_ip ? rdst->remote_ip.sa.sa_family : AF_INET;
185 } else if (nh) {
186 ndm->ndm_family = nh_family;
187 }
188 send_eth = !is_zero_ether_addr(fdb->eth_addr);
189 } else
190 ndm->ndm_family = AF_BRIDGE;
191 ndm->ndm_state = fdb->state;
192 ndm->ndm_ifindex = vxlan->dev->ifindex;
193 ndm->ndm_flags = fdb->flags;
194 if (rdst && rdst->offloaded)
195 ndm->ndm_flags |= NTF_OFFLOADED;
196 ndm->ndm_type = RTN_UNICAST;
197
198 if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
199 nla_put_s32(skb, NDA_LINK_NETNSID,
200 peernet2id(dev_net(vxlan->dev), vxlan->net)))
201 goto nla_put_failure;
202
203 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
204 goto nla_put_failure;
205 if (nh) {
206 if (nla_put_u32(skb, NDA_NH_ID, nh_id))
207 goto nla_put_failure;
208 } else if (rdst) {
209 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST,
210 &rdst->remote_ip))
211 goto nla_put_failure;
212
213 if (rdst->remote_port &&
214 rdst->remote_port != vxlan->cfg.dst_port &&
215 nla_put_be16(skb, NDA_PORT, rdst->remote_port))
216 goto nla_put_failure;
217 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
218 nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni)))
219 goto nla_put_failure;
220 if (rdst->remote_ifindex &&
221 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
222 goto nla_put_failure;
223 }
224
225 if ((vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) && fdb->vni &&
226 nla_put_u32(skb, NDA_SRC_VNI,
227 be32_to_cpu(fdb->vni)))
228 goto nla_put_failure;
229
230 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
231 ci.ndm_confirmed = 0;
232 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
233 ci.ndm_refcnt = 0;
234
235 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
236 goto nla_put_failure;
237
238 nlmsg_end(skb, nlh);
239 return 0;
240
241 nla_put_failure:
242 nlmsg_cancel(skb, nlh);
243 return -EMSGSIZE;
244 }
245
vxlan_nlmsg_size(void)246 static inline size_t vxlan_nlmsg_size(void)
247 {
248 return NLMSG_ALIGN(sizeof(struct ndmsg))
249 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
250 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
251 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
252 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
253 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
254 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
255 + nla_total_size(sizeof(struct nda_cacheinfo));
256 }
257
__vxlan_fdb_notify(struct vxlan_dev * vxlan,struct vxlan_fdb * fdb,struct vxlan_rdst * rd,int type)258 static void __vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
259 struct vxlan_rdst *rd, int type)
260 {
261 struct net *net = dev_net(vxlan->dev);
262 struct sk_buff *skb;
263 int err = -ENOBUFS;
264
265 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
266 if (skb == NULL)
267 goto errout;
268
269 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
270 if (err < 0) {
271 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
272 WARN_ON(err == -EMSGSIZE);
273 kfree_skb(skb);
274 goto errout;
275 }
276
277 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
278 return;
279 errout:
280 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
281 }
282
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)283 static void vxlan_fdb_switchdev_notifier_info(const struct vxlan_dev *vxlan,
284 const struct vxlan_fdb *fdb,
285 const struct vxlan_rdst *rd,
286 struct netlink_ext_ack *extack,
287 struct switchdev_notifier_vxlan_fdb_info *fdb_info)
288 {
289 fdb_info->info.dev = vxlan->dev;
290 fdb_info->info.extack = extack;
291 fdb_info->remote_ip = rd->remote_ip;
292 fdb_info->remote_port = rd->remote_port;
293 fdb_info->remote_vni = rd->remote_vni;
294 fdb_info->remote_ifindex = rd->remote_ifindex;
295 memcpy(fdb_info->eth_addr, fdb->eth_addr, ETH_ALEN);
296 fdb_info->vni = fdb->vni;
297 fdb_info->offloaded = rd->offloaded;
298 fdb_info->added_by_user = fdb->flags & NTF_VXLAN_ADDED_BY_USER;
299 }
300
vxlan_fdb_switchdev_call_notifiers(struct vxlan_dev * vxlan,struct vxlan_fdb * fdb,struct vxlan_rdst * rd,bool adding,struct netlink_ext_ack * extack)301 static int vxlan_fdb_switchdev_call_notifiers(struct vxlan_dev *vxlan,
302 struct vxlan_fdb *fdb,
303 struct vxlan_rdst *rd,
304 bool adding,
305 struct netlink_ext_ack *extack)
306 {
307 struct switchdev_notifier_vxlan_fdb_info info;
308 enum switchdev_notifier_type notifier_type;
309 int ret;
310
311 if (WARN_ON(!rd))
312 return 0;
313
314 notifier_type = adding ? SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE
315 : SWITCHDEV_VXLAN_FDB_DEL_TO_DEVICE;
316 vxlan_fdb_switchdev_notifier_info(vxlan, fdb, rd, NULL, &info);
317 ret = call_switchdev_notifiers(notifier_type, vxlan->dev,
318 &info.info, extack);
319 return notifier_to_errno(ret);
320 }
321
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)322 static int vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
323 struct vxlan_rdst *rd, int type, bool swdev_notify,
324 struct netlink_ext_ack *extack)
325 {
326 int err;
327
328 if (swdev_notify && rd) {
329 switch (type) {
330 case RTM_NEWNEIGH:
331 err = vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd,
332 true, extack);
333 if (err)
334 return err;
335 break;
336 case RTM_DELNEIGH:
337 vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd,
338 false, extack);
339 break;
340 }
341 }
342
343 __vxlan_fdb_notify(vxlan, fdb, rd, type);
344 return 0;
345 }
346
vxlan_ip_miss(struct net_device * dev,union vxlan_addr * ipa)347 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
348 {
349 struct vxlan_dev *vxlan = netdev_priv(dev);
350 struct vxlan_fdb f = {
351 .state = NUD_STALE,
352 };
353 struct vxlan_rdst remote = {
354 .remote_ip = *ipa, /* goes to NDA_DST */
355 .remote_vni = cpu_to_be32(VXLAN_N_VID),
356 };
357
358 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL);
359 }
360
vxlan_fdb_miss(struct vxlan_dev * vxlan,const u8 eth_addr[ETH_ALEN])361 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
362 {
363 struct vxlan_fdb f = {
364 .state = NUD_STALE,
365 };
366 struct vxlan_rdst remote = { };
367
368 memcpy(f.eth_addr, eth_addr, ETH_ALEN);
369
370 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL);
371 }
372
373 /* Hash Ethernet address */
eth_hash(const unsigned char * addr)374 static u32 eth_hash(const unsigned char *addr)
375 {
376 u64 value = get_unaligned((u64 *)addr);
377
378 /* only want 6 bytes */
379 #ifdef __BIG_ENDIAN
380 value >>= 16;
381 #else
382 value <<= 16;
383 #endif
384 return hash_64(value, FDB_HASH_BITS);
385 }
386
eth_vni_hash(const unsigned char * addr,__be32 vni)387 u32 eth_vni_hash(const unsigned char *addr, __be32 vni)
388 {
389 /* use 1 byte of OUI and 3 bytes of NIC */
390 u32 key = get_unaligned((u32 *)(addr + 2));
391
392 return jhash_2words(key, vni, vxlan_salt) & (FDB_HASH_SIZE - 1);
393 }
394
fdb_head_index(struct vxlan_dev * vxlan,const u8 * mac,__be32 vni)395 u32 fdb_head_index(struct vxlan_dev *vxlan, const u8 *mac, __be32 vni)
396 {
397 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)
398 return eth_vni_hash(mac, vni);
399 else
400 return eth_hash(mac);
401 }
402
403 /* Hash chain to use given mac address */
vxlan_fdb_head(struct vxlan_dev * vxlan,const u8 * mac,__be32 vni)404 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
405 const u8 *mac, __be32 vni)
406 {
407 return &vxlan->fdb_head[fdb_head_index(vxlan, mac, vni)];
408 }
409
410 /* Look up Ethernet address in forwarding table */
__vxlan_find_mac(struct vxlan_dev * vxlan,const u8 * mac,__be32 vni)411 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
412 const u8 *mac, __be32 vni)
413 {
414 struct hlist_head *head = vxlan_fdb_head(vxlan, mac, vni);
415 struct vxlan_fdb *f;
416
417 hlist_for_each_entry_rcu(f, head, hlist) {
418 if (ether_addr_equal(mac, f->eth_addr)) {
419 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
420 if (vni == f->vni)
421 return f;
422 } else {
423 return f;
424 }
425 }
426 }
427
428 return NULL;
429 }
430
vxlan_find_mac(struct vxlan_dev * vxlan,const u8 * mac,__be32 vni)431 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
432 const u8 *mac, __be32 vni)
433 {
434 struct vxlan_fdb *f;
435
436 f = __vxlan_find_mac(vxlan, mac, vni);
437 if (f && f->used != jiffies)
438 f->used = jiffies;
439
440 return f;
441 }
442
443 /* caller should hold vxlan->hash_lock */
vxlan_fdb_find_rdst(struct vxlan_fdb * f,union vxlan_addr * ip,__be16 port,__be32 vni,__u32 ifindex)444 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
445 union vxlan_addr *ip, __be16 port,
446 __be32 vni, __u32 ifindex)
447 {
448 struct vxlan_rdst *rd;
449
450 list_for_each_entry(rd, &f->remotes, list) {
451 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
452 rd->remote_port == port &&
453 rd->remote_vni == vni &&
454 rd->remote_ifindex == ifindex)
455 return rd;
456 }
457
458 return NULL;
459 }
460
vxlan_fdb_find_uc(struct net_device * dev,const u8 * mac,__be32 vni,struct switchdev_notifier_vxlan_fdb_info * fdb_info)461 int vxlan_fdb_find_uc(struct net_device *dev, const u8 *mac, __be32 vni,
462 struct switchdev_notifier_vxlan_fdb_info *fdb_info)
463 {
464 struct vxlan_dev *vxlan = netdev_priv(dev);
465 u8 eth_addr[ETH_ALEN + 2] = { 0 };
466 struct vxlan_rdst *rdst;
467 struct vxlan_fdb *f;
468 int rc = 0;
469
470 if (is_multicast_ether_addr(mac) ||
471 is_zero_ether_addr(mac))
472 return -EINVAL;
473
474 ether_addr_copy(eth_addr, mac);
475
476 rcu_read_lock();
477
478 f = __vxlan_find_mac(vxlan, eth_addr, vni);
479 if (!f) {
480 rc = -ENOENT;
481 goto out;
482 }
483
484 rdst = first_remote_rcu(f);
485 vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, NULL, fdb_info);
486
487 out:
488 rcu_read_unlock();
489 return rc;
490 }
491 EXPORT_SYMBOL_GPL(vxlan_fdb_find_uc);
492
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)493 static int vxlan_fdb_notify_one(struct notifier_block *nb,
494 const struct vxlan_dev *vxlan,
495 const struct vxlan_fdb *f,
496 const struct vxlan_rdst *rdst,
497 struct netlink_ext_ack *extack)
498 {
499 struct switchdev_notifier_vxlan_fdb_info fdb_info;
500 int rc;
501
502 vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, extack, &fdb_info);
503 rc = nb->notifier_call(nb, SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE,
504 &fdb_info);
505 return notifier_to_errno(rc);
506 }
507
vxlan_fdb_replay(const struct net_device * dev,__be32 vni,struct notifier_block * nb,struct netlink_ext_ack * extack)508 int vxlan_fdb_replay(const struct net_device *dev, __be32 vni,
509 struct notifier_block *nb,
510 struct netlink_ext_ack *extack)
511 {
512 struct vxlan_dev *vxlan;
513 struct vxlan_rdst *rdst;
514 struct vxlan_fdb *f;
515 unsigned int h;
516 int rc = 0;
517
518 if (!netif_is_vxlan(dev))
519 return -EINVAL;
520 vxlan = netdev_priv(dev);
521
522 for (h = 0; h < FDB_HASH_SIZE; ++h) {
523 spin_lock_bh(&vxlan->hash_lock[h]);
524 hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist) {
525 if (f->vni == vni) {
526 list_for_each_entry(rdst, &f->remotes, list) {
527 rc = vxlan_fdb_notify_one(nb, vxlan,
528 f, rdst,
529 extack);
530 if (rc)
531 goto unlock;
532 }
533 }
534 }
535 spin_unlock_bh(&vxlan->hash_lock[h]);
536 }
537 return 0;
538
539 unlock:
540 spin_unlock_bh(&vxlan->hash_lock[h]);
541 return rc;
542 }
543 EXPORT_SYMBOL_GPL(vxlan_fdb_replay);
544
vxlan_fdb_clear_offload(const struct net_device * dev,__be32 vni)545 void vxlan_fdb_clear_offload(const struct net_device *dev, __be32 vni)
546 {
547 struct vxlan_dev *vxlan;
548 struct vxlan_rdst *rdst;
549 struct vxlan_fdb *f;
550 unsigned int h;
551
552 if (!netif_is_vxlan(dev))
553 return;
554 vxlan = netdev_priv(dev);
555
556 for (h = 0; h < FDB_HASH_SIZE; ++h) {
557 spin_lock_bh(&vxlan->hash_lock[h]);
558 hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist)
559 if (f->vni == vni)
560 list_for_each_entry(rdst, &f->remotes, list)
561 rdst->offloaded = false;
562 spin_unlock_bh(&vxlan->hash_lock[h]);
563 }
564
565 }
566 EXPORT_SYMBOL_GPL(vxlan_fdb_clear_offload);
567
568 /* 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)569 static int vxlan_fdb_replace(struct vxlan_fdb *f,
570 union vxlan_addr *ip, __be16 port, __be32 vni,
571 __u32 ifindex, struct vxlan_rdst *oldrd)
572 {
573 struct vxlan_rdst *rd;
574
575 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
576 if (rd)
577 return 0;
578
579 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
580 if (!rd)
581 return 0;
582
583 *oldrd = *rd;
584 dst_cache_reset(&rd->dst_cache);
585 rd->remote_ip = *ip;
586 rd->remote_port = port;
587 rd->remote_vni = vni;
588 rd->remote_ifindex = ifindex;
589 rd->offloaded = false;
590 return 1;
591 }
592
593 /* 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)594 static int vxlan_fdb_append(struct vxlan_fdb *f,
595 union vxlan_addr *ip, __be16 port, __be32 vni,
596 __u32 ifindex, struct vxlan_rdst **rdp)
597 {
598 struct vxlan_rdst *rd;
599
600 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
601 if (rd)
602 return 0;
603
604 rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
605 if (rd == NULL)
606 return -ENOMEM;
607
608 if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) {
609 kfree(rd);
610 return -ENOMEM;
611 }
612
613 rd->remote_ip = *ip;
614 rd->remote_port = port;
615 rd->offloaded = false;
616 rd->remote_vni = vni;
617 rd->remote_ifindex = ifindex;
618
619 list_add_tail_rcu(&rd->list, &f->remotes);
620
621 *rdp = rd;
622 return 1;
623 }
624
vxlan_parse_gpe_proto(const struct vxlanhdr * hdr,__be16 * protocol)625 static bool vxlan_parse_gpe_proto(const struct vxlanhdr *hdr, __be16 *protocol)
626 {
627 const struct vxlanhdr_gpe *gpe = (const struct vxlanhdr_gpe *)hdr;
628
629 /* Need to have Next Protocol set for interfaces in GPE mode. */
630 if (!gpe->np_applied)
631 return false;
632 /* "The initial version is 0. If a receiver does not support the
633 * version indicated it MUST drop the packet.
634 */
635 if (gpe->version != 0)
636 return false;
637 /* "When the O bit is set to 1, the packet is an OAM packet and OAM
638 * processing MUST occur." However, we don't implement OAM
639 * processing, thus drop the packet.
640 */
641 if (gpe->oam_flag)
642 return false;
643
644 *protocol = tun_p_to_eth_p(gpe->next_protocol);
645 if (!*protocol)
646 return false;
647
648 return true;
649 }
650
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)651 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
652 unsigned int off,
653 struct vxlanhdr *vh, size_t hdrlen,
654 __be32 vni_field,
655 struct gro_remcsum *grc,
656 bool nopartial)
657 {
658 size_t start, offset;
659
660 if (skb->remcsum_offload)
661 return vh;
662
663 if (!NAPI_GRO_CB(skb)->csum_valid)
664 return NULL;
665
666 start = vxlan_rco_start(vni_field);
667 offset = start + vxlan_rco_offset(vni_field);
668
669 vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
670 start, offset, grc, nopartial);
671
672 skb->remcsum_offload = 1;
673
674 return vh;
675 }
676
vxlan_gro_prepare_receive(struct sock * sk,struct list_head * head,struct sk_buff * skb,struct gro_remcsum * grc)677 static struct vxlanhdr *vxlan_gro_prepare_receive(struct sock *sk,
678 struct list_head *head,
679 struct sk_buff *skb,
680 struct gro_remcsum *grc)
681 {
682 struct sk_buff *p;
683 struct vxlanhdr *vh, *vh2;
684 unsigned int hlen, off_vx;
685 struct vxlan_sock *vs = rcu_dereference_sk_user_data(sk);
686 __be32 flags;
687
688 skb_gro_remcsum_init(grc);
689
690 off_vx = skb_gro_offset(skb);
691 hlen = off_vx + sizeof(*vh);
692 vh = skb_gro_header(skb, hlen, off_vx);
693 if (unlikely(!vh))
694 return NULL;
695
696 skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
697
698 flags = vh->vx_flags;
699
700 if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
701 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
702 vh->vx_vni, grc,
703 !!(vs->flags &
704 VXLAN_F_REMCSUM_NOPARTIAL));
705
706 if (!vh)
707 return NULL;
708 }
709
710 skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
711
712 list_for_each_entry(p, head, list) {
713 if (!NAPI_GRO_CB(p)->same_flow)
714 continue;
715
716 vh2 = (struct vxlanhdr *)(p->data + off_vx);
717 if (vh->vx_flags != vh2->vx_flags ||
718 vh->vx_vni != vh2->vx_vni) {
719 NAPI_GRO_CB(p)->same_flow = 0;
720 continue;
721 }
722 }
723
724 return vh;
725 }
726
vxlan_gro_receive(struct sock * sk,struct list_head * head,struct sk_buff * skb)727 static struct sk_buff *vxlan_gro_receive(struct sock *sk,
728 struct list_head *head,
729 struct sk_buff *skb)
730 {
731 struct sk_buff *pp = NULL;
732 struct gro_remcsum grc;
733 int flush = 1;
734
735 if (vxlan_gro_prepare_receive(sk, head, skb, &grc)) {
736 pp = call_gro_receive(eth_gro_receive, head, skb);
737 flush = 0;
738 }
739 skb_gro_flush_final_remcsum(skb, pp, flush, &grc);
740 return pp;
741 }
742
vxlan_gpe_gro_receive(struct sock * sk,struct list_head * head,struct sk_buff * skb)743 static struct sk_buff *vxlan_gpe_gro_receive(struct sock *sk,
744 struct list_head *head,
745 struct sk_buff *skb)
746 {
747 const struct packet_offload *ptype;
748 struct sk_buff *pp = NULL;
749 struct gro_remcsum grc;
750 struct vxlanhdr *vh;
751 __be16 protocol;
752 int flush = 1;
753
754 vh = vxlan_gro_prepare_receive(sk, head, skb, &grc);
755 if (vh) {
756 if (!vxlan_parse_gpe_proto(vh, &protocol))
757 goto out;
758 ptype = gro_find_receive_by_type(protocol);
759 if (!ptype)
760 goto out;
761 pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
762 flush = 0;
763 }
764 out:
765 skb_gro_flush_final_remcsum(skb, pp, flush, &grc);
766 return pp;
767 }
768
vxlan_gro_complete(struct sock * sk,struct sk_buff * skb,int nhoff)769 static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
770 {
771 /* Sets 'skb->inner_mac_header' since we are always called with
772 * 'skb->encapsulation' set.
773 */
774 return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
775 }
776
vxlan_gpe_gro_complete(struct sock * sk,struct sk_buff * skb,int nhoff)777 static int vxlan_gpe_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
778 {
779 struct vxlanhdr *vh = (struct vxlanhdr *)(skb->data + nhoff);
780 const struct packet_offload *ptype;
781 int err = -ENOSYS;
782 __be16 protocol;
783
784 if (!vxlan_parse_gpe_proto(vh, &protocol))
785 return err;
786 ptype = gro_find_complete_by_type(protocol);
787 if (ptype)
788 err = ptype->callbacks.gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
789 return err;
790 }
791
vxlan_fdb_alloc(struct vxlan_dev * vxlan,const u8 * mac,__u16 state,__be32 src_vni,__u16 ndm_flags)792 static struct vxlan_fdb *vxlan_fdb_alloc(struct vxlan_dev *vxlan, const u8 *mac,
793 __u16 state, __be32 src_vni,
794 __u16 ndm_flags)
795 {
796 struct vxlan_fdb *f;
797
798 f = kmalloc(sizeof(*f), GFP_ATOMIC);
799 if (!f)
800 return NULL;
801 f->state = state;
802 f->flags = ndm_flags;
803 f->updated = f->used = jiffies;
804 f->vni = src_vni;
805 f->nh = NULL;
806 RCU_INIT_POINTER(f->vdev, vxlan);
807 INIT_LIST_HEAD(&f->nh_list);
808 INIT_LIST_HEAD(&f->remotes);
809 memcpy(f->eth_addr, mac, ETH_ALEN);
810
811 return f;
812 }
813
vxlan_fdb_insert(struct vxlan_dev * vxlan,const u8 * mac,__be32 src_vni,struct vxlan_fdb * f)814 static void vxlan_fdb_insert(struct vxlan_dev *vxlan, const u8 *mac,
815 __be32 src_vni, struct vxlan_fdb *f)
816 {
817 ++vxlan->addrcnt;
818 hlist_add_head_rcu(&f->hlist,
819 vxlan_fdb_head(vxlan, mac, src_vni));
820 }
821
vxlan_fdb_nh_update(struct vxlan_dev * vxlan,struct vxlan_fdb * fdb,u32 nhid,struct netlink_ext_ack * extack)822 static int vxlan_fdb_nh_update(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
823 u32 nhid, struct netlink_ext_ack *extack)
824 {
825 struct nexthop *old_nh = rtnl_dereference(fdb->nh);
826 struct nexthop *nh;
827 int err = -EINVAL;
828
829 if (old_nh && old_nh->id == nhid)
830 return 0;
831
832 nh = nexthop_find_by_id(vxlan->net, nhid);
833 if (!nh) {
834 NL_SET_ERR_MSG(extack, "Nexthop id does not exist");
835 goto err_inval;
836 }
837
838 if (!nexthop_get(nh)) {
839 NL_SET_ERR_MSG(extack, "Nexthop has been deleted");
840 nh = NULL;
841 goto err_inval;
842 }
843 if (!nexthop_is_fdb(nh)) {
844 NL_SET_ERR_MSG(extack, "Nexthop is not a fdb nexthop");
845 goto err_inval;
846 }
847
848 if (!nexthop_is_multipath(nh)) {
849 NL_SET_ERR_MSG(extack, "Nexthop is not a multipath group");
850 goto err_inval;
851 }
852
853 /* check nexthop group family */
854 switch (vxlan->default_dst.remote_ip.sa.sa_family) {
855 case AF_INET:
856 if (!nexthop_has_v4(nh)) {
857 err = -EAFNOSUPPORT;
858 NL_SET_ERR_MSG(extack, "Nexthop group family not supported");
859 goto err_inval;
860 }
861 break;
862 case AF_INET6:
863 if (nexthop_has_v4(nh)) {
864 err = -EAFNOSUPPORT;
865 NL_SET_ERR_MSG(extack, "Nexthop group family not supported");
866 goto err_inval;
867 }
868 }
869
870 if (old_nh) {
871 list_del_rcu(&fdb->nh_list);
872 nexthop_put(old_nh);
873 }
874 rcu_assign_pointer(fdb->nh, nh);
875 list_add_tail_rcu(&fdb->nh_list, &nh->fdb_list);
876 return 1;
877
878 err_inval:
879 if (nh)
880 nexthop_put(nh);
881 return err;
882 }
883
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)884 int vxlan_fdb_create(struct vxlan_dev *vxlan,
885 const u8 *mac, union vxlan_addr *ip,
886 __u16 state, __be16 port, __be32 src_vni,
887 __be32 vni, __u32 ifindex, __u16 ndm_flags,
888 u32 nhid, struct vxlan_fdb **fdb,
889 struct netlink_ext_ack *extack)
890 {
891 struct vxlan_rdst *rd = NULL;
892 struct vxlan_fdb *f;
893 int rc;
894
895 if (vxlan->cfg.addrmax &&
896 vxlan->addrcnt >= vxlan->cfg.addrmax)
897 return -ENOSPC;
898
899 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
900 f = vxlan_fdb_alloc(vxlan, mac, state, src_vni, ndm_flags);
901 if (!f)
902 return -ENOMEM;
903
904 if (nhid)
905 rc = vxlan_fdb_nh_update(vxlan, f, nhid, extack);
906 else
907 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
908 if (rc < 0)
909 goto errout;
910
911 *fdb = f;
912
913 return 0;
914
915 errout:
916 kfree(f);
917 return rc;
918 }
919
__vxlan_fdb_free(struct vxlan_fdb * f)920 static void __vxlan_fdb_free(struct vxlan_fdb *f)
921 {
922 struct vxlan_rdst *rd, *nd;
923 struct nexthop *nh;
924
925 nh = rcu_dereference_raw(f->nh);
926 if (nh) {
927 rcu_assign_pointer(f->nh, NULL);
928 rcu_assign_pointer(f->vdev, NULL);
929 nexthop_put(nh);
930 }
931
932 list_for_each_entry_safe(rd, nd, &f->remotes, list) {
933 dst_cache_destroy(&rd->dst_cache);
934 kfree(rd);
935 }
936 kfree(f);
937 }
938
vxlan_fdb_free(struct rcu_head * head)939 static void vxlan_fdb_free(struct rcu_head *head)
940 {
941 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
942
943 __vxlan_fdb_free(f);
944 }
945
vxlan_fdb_destroy(struct vxlan_dev * vxlan,struct vxlan_fdb * f,bool do_notify,bool swdev_notify)946 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
947 bool do_notify, bool swdev_notify)
948 {
949 struct vxlan_rdst *rd;
950
951 netdev_dbg(vxlan->dev, "delete %pM\n", f->eth_addr);
952
953 --vxlan->addrcnt;
954 if (do_notify) {
955 if (rcu_access_pointer(f->nh))
956 vxlan_fdb_notify(vxlan, f, NULL, RTM_DELNEIGH,
957 swdev_notify, NULL);
958 else
959 list_for_each_entry(rd, &f->remotes, list)
960 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH,
961 swdev_notify, NULL);
962 }
963
964 hlist_del_rcu(&f->hlist);
965 list_del_rcu(&f->nh_list);
966 call_rcu(&f->rcu, vxlan_fdb_free);
967 }
968
vxlan_dst_free(struct rcu_head * head)969 static void vxlan_dst_free(struct rcu_head *head)
970 {
971 struct vxlan_rdst *rd = container_of(head, struct vxlan_rdst, rcu);
972
973 dst_cache_destroy(&rd->dst_cache);
974 kfree(rd);
975 }
976
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)977 static int vxlan_fdb_update_existing(struct vxlan_dev *vxlan,
978 union vxlan_addr *ip,
979 __u16 state, __u16 flags,
980 __be16 port, __be32 vni,
981 __u32 ifindex, __u16 ndm_flags,
982 struct vxlan_fdb *f, u32 nhid,
983 bool swdev_notify,
984 struct netlink_ext_ack *extack)
985 {
986 __u16 fdb_flags = (ndm_flags & ~NTF_USE);
987 struct vxlan_rdst *rd = NULL;
988 struct vxlan_rdst oldrd;
989 int notify = 0;
990 int rc = 0;
991 int err;
992
993 if (nhid && !rcu_access_pointer(f->nh)) {
994 NL_SET_ERR_MSG(extack,
995 "Cannot replace an existing non nexthop fdb with a nexthop");
996 return -EOPNOTSUPP;
997 }
998
999 if (nhid && (flags & NLM_F_APPEND)) {
1000 NL_SET_ERR_MSG(extack,
1001 "Cannot append to a nexthop fdb");
1002 return -EOPNOTSUPP;
1003 }
1004
1005 /* Do not allow an externally learned entry to take over an entry added
1006 * by the user.
1007 */
1008 if (!(fdb_flags & NTF_EXT_LEARNED) ||
1009 !(f->flags & NTF_VXLAN_ADDED_BY_USER)) {
1010 if (f->state != state) {
1011 f->state = state;
1012 f->updated = jiffies;
1013 notify = 1;
1014 }
1015 if (f->flags != fdb_flags) {
1016 f->flags = fdb_flags;
1017 f->updated = jiffies;
1018 notify = 1;
1019 }
1020 }
1021
1022 if ((flags & NLM_F_REPLACE)) {
1023 /* Only change unicasts */
1024 if (!(is_multicast_ether_addr(f->eth_addr) ||
1025 is_zero_ether_addr(f->eth_addr))) {
1026 if (nhid) {
1027 rc = vxlan_fdb_nh_update(vxlan, f, nhid, extack);
1028 if (rc < 0)
1029 return rc;
1030 } else {
1031 rc = vxlan_fdb_replace(f, ip, port, vni,
1032 ifindex, &oldrd);
1033 }
1034 notify |= rc;
1035 } else {
1036 NL_SET_ERR_MSG(extack, "Cannot replace non-unicast fdb entries");
1037 return -EOPNOTSUPP;
1038 }
1039 }
1040 if ((flags & NLM_F_APPEND) &&
1041 (is_multicast_ether_addr(f->eth_addr) ||
1042 is_zero_ether_addr(f->eth_addr))) {
1043 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
1044
1045 if (rc < 0)
1046 return rc;
1047 notify |= rc;
1048 }
1049
1050 if (ndm_flags & NTF_USE)
1051 f->used = jiffies;
1052
1053 if (notify) {
1054 if (rd == NULL)
1055 rd = first_remote_rtnl(f);
1056
1057 err = vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH,
1058 swdev_notify, extack);
1059 if (err)
1060 goto err_notify;
1061 }
1062
1063 return 0;
1064
1065 err_notify:
1066 if (nhid)
1067 return err;
1068 if ((flags & NLM_F_REPLACE) && rc)
1069 *rd = oldrd;
1070 else if ((flags & NLM_F_APPEND) && rc) {
1071 list_del_rcu(&rd->list);
1072 call_rcu(&rd->rcu, vxlan_dst_free);
1073 }
1074 return err;
1075 }
1076
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)1077 static int vxlan_fdb_update_create(struct vxlan_dev *vxlan,
1078 const u8 *mac, union vxlan_addr *ip,
1079 __u16 state, __u16 flags,
1080 __be16 port, __be32 src_vni, __be32 vni,
1081 __u32 ifindex, __u16 ndm_flags, u32 nhid,
1082 bool swdev_notify,
1083 struct netlink_ext_ack *extack)
1084 {
1085 __u16 fdb_flags = (ndm_flags & ~NTF_USE);
1086 struct vxlan_fdb *f;
1087 int rc;
1088
1089 /* Disallow replace to add a multicast entry */
1090 if ((flags & NLM_F_REPLACE) &&
1091 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
1092 return -EOPNOTSUPP;
1093
1094 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
1095 rc = vxlan_fdb_create(vxlan, mac, ip, state, port, src_vni,
1096 vni, ifindex, fdb_flags, nhid, &f, extack);
1097 if (rc < 0)
1098 return rc;
1099
1100 vxlan_fdb_insert(vxlan, mac, src_vni, f);
1101 rc = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_NEWNEIGH,
1102 swdev_notify, extack);
1103 if (rc)
1104 goto err_notify;
1105
1106 return 0;
1107
1108 err_notify:
1109 vxlan_fdb_destroy(vxlan, f, false, false);
1110 return rc;
1111 }
1112
1113 /* 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)1114 int vxlan_fdb_update(struct vxlan_dev *vxlan,
1115 const u8 *mac, union vxlan_addr *ip,
1116 __u16 state, __u16 flags,
1117 __be16 port, __be32 src_vni, __be32 vni,
1118 __u32 ifindex, __u16 ndm_flags, u32 nhid,
1119 bool swdev_notify,
1120 struct netlink_ext_ack *extack)
1121 {
1122 struct vxlan_fdb *f;
1123
1124 f = __vxlan_find_mac(vxlan, mac, src_vni);
1125 if (f) {
1126 if (flags & NLM_F_EXCL) {
1127 netdev_dbg(vxlan->dev,
1128 "lost race to create %pM\n", mac);
1129 return -EEXIST;
1130 }
1131
1132 return vxlan_fdb_update_existing(vxlan, ip, state, flags, port,
1133 vni, ifindex, ndm_flags, f,
1134 nhid, swdev_notify, extack);
1135 } else {
1136 if (!(flags & NLM_F_CREATE))
1137 return -ENOENT;
1138
1139 return vxlan_fdb_update_create(vxlan, mac, ip, state, flags,
1140 port, src_vni, vni, ifindex,
1141 ndm_flags, nhid, swdev_notify,
1142 extack);
1143 }
1144 }
1145
vxlan_fdb_dst_destroy(struct vxlan_dev * vxlan,struct vxlan_fdb * f,struct vxlan_rdst * rd,bool swdev_notify)1146 static void vxlan_fdb_dst_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
1147 struct vxlan_rdst *rd, bool swdev_notify)
1148 {
1149 list_del_rcu(&rd->list);
1150 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH, swdev_notify, NULL);
1151 call_rcu(&rd->rcu, vxlan_dst_free);
1152 }
1153
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,struct netlink_ext_ack * extack)1154 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
1155 union vxlan_addr *ip, __be16 *port, __be32 *src_vni,
1156 __be32 *vni, u32 *ifindex, u32 *nhid,
1157 struct netlink_ext_ack *extack)
1158 {
1159 struct net *net = dev_net(vxlan->dev);
1160 int err;
1161
1162 if (tb[NDA_NH_ID] &&
1163 (tb[NDA_DST] || tb[NDA_VNI] || tb[NDA_IFINDEX] || tb[NDA_PORT])) {
1164 NL_SET_ERR_MSG(extack, "DST, VNI, ifindex and port are mutually exclusive with NH_ID");
1165 return -EINVAL;
1166 }
1167
1168 if (tb[NDA_DST]) {
1169 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
1170 if (err) {
1171 NL_SET_ERR_MSG(extack, "Unsupported address family");
1172 return err;
1173 }
1174 } else {
1175 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
1176
1177 if (remote->sa.sa_family == AF_INET) {
1178 ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
1179 ip->sa.sa_family = AF_INET;
1180 #if IS_ENABLED(CONFIG_IPV6)
1181 } else {
1182 ip->sin6.sin6_addr = in6addr_any;
1183 ip->sa.sa_family = AF_INET6;
1184 #endif
1185 }
1186 }
1187
1188 if (tb[NDA_PORT]) {
1189 if (nla_len(tb[NDA_PORT]) != sizeof(__be16)) {
1190 NL_SET_ERR_MSG(extack, "Invalid vxlan port");
1191 return -EINVAL;
1192 }
1193 *port = nla_get_be16(tb[NDA_PORT]);
1194 } else {
1195 *port = vxlan->cfg.dst_port;
1196 }
1197
1198 if (tb[NDA_VNI]) {
1199 if (nla_len(tb[NDA_VNI]) != sizeof(u32)) {
1200 NL_SET_ERR_MSG(extack, "Invalid vni");
1201 return -EINVAL;
1202 }
1203 *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
1204 } else {
1205 *vni = vxlan->default_dst.remote_vni;
1206 }
1207
1208 if (tb[NDA_SRC_VNI]) {
1209 if (nla_len(tb[NDA_SRC_VNI]) != sizeof(u32)) {
1210 NL_SET_ERR_MSG(extack, "Invalid src vni");
1211 return -EINVAL;
1212 }
1213 *src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI]));
1214 } else {
1215 *src_vni = vxlan->default_dst.remote_vni;
1216 }
1217
1218 if (tb[NDA_IFINDEX]) {
1219 struct net_device *tdev;
1220
1221 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32)) {
1222 NL_SET_ERR_MSG(extack, "Invalid ifindex");
1223 return -EINVAL;
1224 }
1225 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
1226 tdev = __dev_get_by_index(net, *ifindex);
1227 if (!tdev) {
1228 NL_SET_ERR_MSG(extack, "Device not found");
1229 return -EADDRNOTAVAIL;
1230 }
1231 } else {
1232 *ifindex = 0;
1233 }
1234
1235 *nhid = nla_get_u32_default(tb[NDA_NH_ID], 0);
1236
1237 return 0;
1238 }
1239
1240 /* 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,bool * notified,struct netlink_ext_ack * extack)1241 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
1242 struct net_device *dev,
1243 const unsigned char *addr, u16 vid, u16 flags,
1244 bool *notified, struct netlink_ext_ack *extack)
1245 {
1246 struct vxlan_dev *vxlan = netdev_priv(dev);
1247 /* struct net *net = dev_net(vxlan->dev); */
1248 union vxlan_addr ip;
1249 __be16 port;
1250 __be32 src_vni, vni;
1251 u32 ifindex, nhid;
1252 u32 hash_index;
1253 int err;
1254
1255 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
1256 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
1257 ndm->ndm_state);
1258 return -EINVAL;
1259 }
1260
1261 if (!tb || (!tb[NDA_DST] && !tb[NDA_NH_ID]))
1262 return -EINVAL;
1263
1264 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex,
1265 &nhid, extack);
1266 if (err)
1267 return err;
1268
1269 if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
1270 return -EAFNOSUPPORT;
1271
1272 hash_index = fdb_head_index(vxlan, addr, src_vni);
1273 spin_lock_bh(&vxlan->hash_lock[hash_index]);
1274 err = vxlan_fdb_update(vxlan, addr, &ip, ndm->ndm_state, flags,
1275 port, src_vni, vni, ifindex,
1276 ndm->ndm_flags | NTF_VXLAN_ADDED_BY_USER,
1277 nhid, true, extack);
1278 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
1279
1280 if (!err)
1281 *notified = true;
1282
1283 return err;
1284 }
1285
__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)1286 int __vxlan_fdb_delete(struct vxlan_dev *vxlan,
1287 const unsigned char *addr, union vxlan_addr ip,
1288 __be16 port, __be32 src_vni, __be32 vni,
1289 u32 ifindex, bool swdev_notify)
1290 {
1291 struct vxlan_rdst *rd = NULL;
1292 struct vxlan_fdb *f;
1293 int err = -ENOENT;
1294
1295 f = vxlan_find_mac(vxlan, addr, src_vni);
1296 if (!f)
1297 return err;
1298
1299 if (!vxlan_addr_any(&ip)) {
1300 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
1301 if (!rd)
1302 goto out;
1303 }
1304
1305 /* remove a destination if it's not the only one on the list,
1306 * otherwise destroy the fdb entry
1307 */
1308 if (rd && !list_is_singular(&f->remotes)) {
1309 vxlan_fdb_dst_destroy(vxlan, f, rd, swdev_notify);
1310 goto out;
1311 }
1312
1313 vxlan_fdb_destroy(vxlan, f, true, swdev_notify);
1314
1315 out:
1316 return 0;
1317 }
1318
1319 /* Delete entry (via netlink) */
vxlan_fdb_delete(struct ndmsg * ndm,struct nlattr * tb[],struct net_device * dev,const unsigned char * addr,u16 vid,bool * notified,struct netlink_ext_ack * extack)1320 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
1321 struct net_device *dev,
1322 const unsigned char *addr, u16 vid, bool *notified,
1323 struct netlink_ext_ack *extack)
1324 {
1325 struct vxlan_dev *vxlan = netdev_priv(dev);
1326 union vxlan_addr ip;
1327 __be32 src_vni, vni;
1328 u32 ifindex, nhid;
1329 u32 hash_index;
1330 __be16 port;
1331 int err;
1332
1333 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex,
1334 &nhid, extack);
1335 if (err)
1336 return err;
1337
1338 hash_index = fdb_head_index(vxlan, addr, src_vni);
1339 spin_lock_bh(&vxlan->hash_lock[hash_index]);
1340 err = __vxlan_fdb_delete(vxlan, addr, ip, port, src_vni, vni, ifindex,
1341 true);
1342 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
1343
1344 if (!err)
1345 *notified = true;
1346
1347 return err;
1348 }
1349
1350 /* 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)1351 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
1352 struct net_device *dev,
1353 struct net_device *filter_dev, int *idx)
1354 {
1355 struct ndo_fdb_dump_context *ctx = (void *)cb->ctx;
1356 struct vxlan_dev *vxlan = netdev_priv(dev);
1357 unsigned int h;
1358 int err = 0;
1359
1360 for (h = 0; h < FDB_HASH_SIZE; ++h) {
1361 struct vxlan_fdb *f;
1362
1363 rcu_read_lock();
1364 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
1365 struct vxlan_rdst *rd;
1366
1367 if (rcu_access_pointer(f->nh)) {
1368 if (*idx < ctx->fdb_idx)
1369 goto skip_nh;
1370 err = vxlan_fdb_info(skb, vxlan, f,
1371 NETLINK_CB(cb->skb).portid,
1372 cb->nlh->nlmsg_seq,
1373 RTM_NEWNEIGH,
1374 NLM_F_MULTI, NULL);
1375 if (err < 0) {
1376 rcu_read_unlock();
1377 goto out;
1378 }
1379 skip_nh:
1380 *idx += 1;
1381 continue;
1382 }
1383
1384 list_for_each_entry_rcu(rd, &f->remotes, list) {
1385 if (*idx < ctx->fdb_idx)
1386 goto skip;
1387
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, rd);
1393 if (err < 0) {
1394 rcu_read_unlock();
1395 goto out;
1396 }
1397 skip:
1398 *idx += 1;
1399 }
1400 }
1401 rcu_read_unlock();
1402 }
1403 out:
1404 return err;
1405 }
1406
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)1407 static int vxlan_fdb_get(struct sk_buff *skb,
1408 struct nlattr *tb[],
1409 struct net_device *dev,
1410 const unsigned char *addr,
1411 u16 vid, u32 portid, u32 seq,
1412 struct netlink_ext_ack *extack)
1413 {
1414 struct vxlan_dev *vxlan = netdev_priv(dev);
1415 struct vxlan_fdb *f;
1416 __be32 vni;
1417 int err;
1418
1419 if (tb[NDA_VNI])
1420 vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
1421 else
1422 vni = vxlan->default_dst.remote_vni;
1423
1424 rcu_read_lock();
1425
1426 f = __vxlan_find_mac(vxlan, addr, vni);
1427 if (!f) {
1428 NL_SET_ERR_MSG(extack, "Fdb entry not found");
1429 err = -ENOENT;
1430 goto errout;
1431 }
1432
1433 err = vxlan_fdb_info(skb, vxlan, f, portid, seq,
1434 RTM_NEWNEIGH, 0, first_remote_rcu(f));
1435 errout:
1436 rcu_read_unlock();
1437 return err;
1438 }
1439
1440 /* Watch incoming packets to learn mapping between Ethernet address
1441 * and Tunnel endpoint.
1442 */
vxlan_snoop(struct net_device * dev,union vxlan_addr * src_ip,const u8 * src_mac,u32 src_ifindex,__be32 vni)1443 static enum skb_drop_reason vxlan_snoop(struct net_device *dev,
1444 union vxlan_addr *src_ip,
1445 const u8 *src_mac, u32 src_ifindex,
1446 __be32 vni)
1447 {
1448 struct vxlan_dev *vxlan = netdev_priv(dev);
1449 struct vxlan_fdb *f;
1450 u32 ifindex = 0;
1451
1452 /* Ignore packets from invalid src-address */
1453 if (!is_valid_ether_addr(src_mac))
1454 return SKB_DROP_REASON_MAC_INVALID_SOURCE;
1455
1456 #if IS_ENABLED(CONFIG_IPV6)
1457 if (src_ip->sa.sa_family == AF_INET6 &&
1458 (ipv6_addr_type(&src_ip->sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL))
1459 ifindex = src_ifindex;
1460 #endif
1461
1462 f = vxlan_find_mac(vxlan, src_mac, vni);
1463 if (likely(f)) {
1464 struct vxlan_rdst *rdst = first_remote_rcu(f);
1465
1466 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip) &&
1467 rdst->remote_ifindex == ifindex))
1468 return SKB_NOT_DROPPED_YET;
1469
1470 /* Don't migrate static entries, drop packets */
1471 if (f->state & (NUD_PERMANENT | NUD_NOARP))
1472 return SKB_DROP_REASON_VXLAN_ENTRY_EXISTS;
1473
1474 /* Don't override an fdb with nexthop with a learnt entry */
1475 if (rcu_access_pointer(f->nh))
1476 return SKB_DROP_REASON_VXLAN_ENTRY_EXISTS;
1477
1478 if (net_ratelimit())
1479 netdev_info(dev,
1480 "%pM migrated from %pIS to %pIS\n",
1481 src_mac, &rdst->remote_ip.sa, &src_ip->sa);
1482
1483 rdst->remote_ip = *src_ip;
1484 f->updated = jiffies;
1485 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH, true, NULL);
1486 } else {
1487 u32 hash_index = fdb_head_index(vxlan, src_mac, vni);
1488
1489 /* learned new entry */
1490 spin_lock(&vxlan->hash_lock[hash_index]);
1491
1492 /* close off race between vxlan_flush and incoming packets */
1493 if (netif_running(dev))
1494 vxlan_fdb_update(vxlan, src_mac, src_ip,
1495 NUD_REACHABLE,
1496 NLM_F_EXCL|NLM_F_CREATE,
1497 vxlan->cfg.dst_port,
1498 vni,
1499 vxlan->default_dst.remote_vni,
1500 ifindex, NTF_SELF, 0, true, NULL);
1501 spin_unlock(&vxlan->hash_lock[hash_index]);
1502 }
1503
1504 return SKB_NOT_DROPPED_YET;
1505 }
1506
__vxlan_sock_release_prep(struct vxlan_sock * vs)1507 static bool __vxlan_sock_release_prep(struct vxlan_sock *vs)
1508 {
1509 struct vxlan_net *vn;
1510
1511 if (!vs)
1512 return false;
1513 if (!refcount_dec_and_test(&vs->refcnt))
1514 return false;
1515
1516 vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1517 spin_lock(&vn->sock_lock);
1518 hlist_del_rcu(&vs->hlist);
1519 udp_tunnel_notify_del_rx_port(vs->sock,
1520 (vs->flags & VXLAN_F_GPE) ?
1521 UDP_TUNNEL_TYPE_VXLAN_GPE :
1522 UDP_TUNNEL_TYPE_VXLAN);
1523 spin_unlock(&vn->sock_lock);
1524
1525 return true;
1526 }
1527
vxlan_sock_release(struct vxlan_dev * vxlan)1528 static void vxlan_sock_release(struct vxlan_dev *vxlan)
1529 {
1530 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1531 #if IS_ENABLED(CONFIG_IPV6)
1532 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1533
1534 RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
1535 #endif
1536
1537 RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
1538 synchronize_net();
1539
1540 if (vxlan->cfg.flags & VXLAN_F_VNIFILTER)
1541 vxlan_vs_del_vnigrp(vxlan);
1542 else
1543 vxlan_vs_del_dev(vxlan);
1544
1545 if (__vxlan_sock_release_prep(sock4)) {
1546 udp_tunnel_sock_release(sock4->sock);
1547 kfree(sock4);
1548 }
1549
1550 #if IS_ENABLED(CONFIG_IPV6)
1551 if (__vxlan_sock_release_prep(sock6)) {
1552 udp_tunnel_sock_release(sock6->sock);
1553 kfree(sock6);
1554 }
1555 #endif
1556 }
1557
vxlan_remcsum(struct sk_buff * skb,u32 vxflags)1558 static enum skb_drop_reason vxlan_remcsum(struct sk_buff *skb, u32 vxflags)
1559 {
1560 const struct vxlanhdr *vh = vxlan_hdr(skb);
1561 enum skb_drop_reason reason;
1562 size_t start, offset;
1563
1564 if (!(vh->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
1565 return SKB_NOT_DROPPED_YET;
1566
1567 start = vxlan_rco_start(vh->vx_vni);
1568 offset = start + vxlan_rco_offset(vh->vx_vni);
1569
1570 reason = pskb_may_pull_reason(skb, offset + sizeof(u16));
1571 if (reason)
1572 return reason;
1573
1574 skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
1575 !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL));
1576 return SKB_NOT_DROPPED_YET;
1577 }
1578
vxlan_parse_gbp_hdr(struct sk_buff * skb,u32 vxflags,struct vxlan_metadata * md)1579 static void vxlan_parse_gbp_hdr(struct sk_buff *skb, u32 vxflags,
1580 struct vxlan_metadata *md)
1581 {
1582 const struct vxlanhdr *vh = vxlan_hdr(skb);
1583 const struct vxlanhdr_gbp *gbp;
1584 struct metadata_dst *tun_dst;
1585
1586 gbp = (const struct vxlanhdr_gbp *)vh;
1587
1588 if (!(vh->vx_flags & VXLAN_HF_GBP))
1589 return;
1590
1591 md->gbp = ntohs(gbp->policy_id);
1592
1593 tun_dst = (struct metadata_dst *)skb_dst(skb);
1594 if (tun_dst) {
1595 __set_bit(IP_TUNNEL_VXLAN_OPT_BIT,
1596 tun_dst->u.tun_info.key.tun_flags);
1597 tun_dst->u.tun_info.options_len = sizeof(*md);
1598 }
1599 if (gbp->dont_learn)
1600 md->gbp |= VXLAN_GBP_DONT_LEARN;
1601
1602 if (gbp->policy_applied)
1603 md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1604
1605 /* In flow-based mode, GBP is carried in dst_metadata */
1606 if (!(vxflags & VXLAN_F_COLLECT_METADATA))
1607 skb->mark = md->gbp;
1608 }
1609
vxlan_set_mac(struct vxlan_dev * vxlan,struct vxlan_sock * vs,struct sk_buff * skb,__be32 vni)1610 static enum skb_drop_reason vxlan_set_mac(struct vxlan_dev *vxlan,
1611 struct vxlan_sock *vs,
1612 struct sk_buff *skb, __be32 vni)
1613 {
1614 union vxlan_addr saddr;
1615 u32 ifindex = skb->dev->ifindex;
1616
1617 skb_reset_mac_header(skb);
1618 skb->protocol = eth_type_trans(skb, vxlan->dev);
1619 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1620
1621 /* Ignore packet loops (and multicast echo) */
1622 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1623 return SKB_DROP_REASON_LOCAL_MAC;
1624
1625 /* Get address from the outer IP header */
1626 if (vxlan_get_sk_family(vs) == AF_INET) {
1627 saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
1628 saddr.sa.sa_family = AF_INET;
1629 #if IS_ENABLED(CONFIG_IPV6)
1630 } else {
1631 saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
1632 saddr.sa.sa_family = AF_INET6;
1633 #endif
1634 }
1635
1636 if (!(vxlan->cfg.flags & VXLAN_F_LEARN))
1637 return SKB_NOT_DROPPED_YET;
1638
1639 return vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source,
1640 ifindex, vni);
1641 }
1642
vxlan_ecn_decapsulate(struct vxlan_sock * vs,void * oiph,struct sk_buff * skb)1643 static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph,
1644 struct sk_buff *skb)
1645 {
1646 int err = 0;
1647
1648 if (vxlan_get_sk_family(vs) == AF_INET)
1649 err = IP_ECN_decapsulate(oiph, skb);
1650 #if IS_ENABLED(CONFIG_IPV6)
1651 else
1652 err = IP6_ECN_decapsulate(oiph, skb);
1653 #endif
1654
1655 if (unlikely(err) && log_ecn_error) {
1656 if (vxlan_get_sk_family(vs) == AF_INET)
1657 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1658 &((struct iphdr *)oiph)->saddr,
1659 ((struct iphdr *)oiph)->tos);
1660 else
1661 net_info_ratelimited("non-ECT from %pI6\n",
1662 &((struct ipv6hdr *)oiph)->saddr);
1663 }
1664 return err <= 1;
1665 }
1666
1667 /* Callback from net/ipv4/udp.c to receive packets */
vxlan_rcv(struct sock * sk,struct sk_buff * skb)1668 static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
1669 {
1670 struct vxlan_vni_node *vninode = NULL;
1671 const struct vxlanhdr *vh;
1672 struct vxlan_dev *vxlan;
1673 struct vxlan_sock *vs;
1674 struct vxlan_metadata _md;
1675 struct vxlan_metadata *md = &_md;
1676 __be16 protocol = htons(ETH_P_TEB);
1677 enum skb_drop_reason reason;
1678 bool raw_proto = false;
1679 void *oiph;
1680 __be32 vni = 0;
1681 int nh;
1682
1683 /* Need UDP and VXLAN header to be present */
1684 reason = pskb_may_pull_reason(skb, VXLAN_HLEN);
1685 if (reason)
1686 goto drop;
1687
1688 vh = vxlan_hdr(skb);
1689 /* VNI flag always required to be set */
1690 if (!(vh->vx_flags & VXLAN_HF_VNI)) {
1691 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1692 ntohl(vh->vx_flags), ntohl(vh->vx_vni));
1693 reason = SKB_DROP_REASON_VXLAN_INVALID_HDR;
1694 /* Return non vxlan pkt */
1695 goto drop;
1696 }
1697
1698 vs = rcu_dereference_sk_user_data(sk);
1699 if (!vs)
1700 goto drop;
1701
1702 vni = vxlan_vni(vh->vx_vni);
1703
1704 vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni, &vninode);
1705 if (!vxlan) {
1706 reason = SKB_DROP_REASON_VXLAN_VNI_NOT_FOUND;
1707 goto drop;
1708 }
1709
1710 if (vh->vx_flags & vxlan->cfg.reserved_bits.vx_flags ||
1711 vh->vx_vni & vxlan->cfg.reserved_bits.vx_vni) {
1712 /* If the header uses bits besides those enabled by the
1713 * netdevice configuration, treat this as a malformed packet.
1714 * This behavior diverges from VXLAN RFC (RFC7348) which
1715 * stipulates that bits in reserved in reserved fields are to be
1716 * ignored. The approach here maintains compatibility with
1717 * previous stack code, and also is more robust and provides a
1718 * little more security in adding extensions to VXLAN.
1719 */
1720 reason = SKB_DROP_REASON_VXLAN_INVALID_HDR;
1721 DEV_STATS_INC(vxlan->dev, rx_frame_errors);
1722 DEV_STATS_INC(vxlan->dev, rx_errors);
1723 vxlan_vnifilter_count(vxlan, vni, vninode,
1724 VXLAN_VNI_STATS_RX_ERRORS, 0);
1725 goto drop;
1726 }
1727
1728 if (vxlan->cfg.flags & VXLAN_F_GPE) {
1729 if (!vxlan_parse_gpe_proto(vh, &protocol))
1730 goto drop;
1731 raw_proto = true;
1732 }
1733
1734 if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto,
1735 !net_eq(vxlan->net, dev_net(vxlan->dev)))) {
1736 reason = SKB_DROP_REASON_NOMEM;
1737 goto drop;
1738 }
1739
1740 if (vxlan->cfg.flags & VXLAN_F_REMCSUM_RX) {
1741 reason = vxlan_remcsum(skb, vxlan->cfg.flags);
1742 if (unlikely(reason))
1743 goto drop;
1744 }
1745
1746 if (vxlan_collect_metadata(vs)) {
1747 IP_TUNNEL_DECLARE_FLAGS(flags) = { };
1748 struct metadata_dst *tun_dst;
1749
1750 __set_bit(IP_TUNNEL_KEY_BIT, flags);
1751 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), flags,
1752 key32_to_tunnel_id(vni), sizeof(*md));
1753
1754 if (!tun_dst) {
1755 reason = SKB_DROP_REASON_NOMEM;
1756 goto drop;
1757 }
1758
1759 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1760
1761 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1762 } else {
1763 memset(md, 0, sizeof(*md));
1764 }
1765
1766 if (vxlan->cfg.flags & VXLAN_F_GBP)
1767 vxlan_parse_gbp_hdr(skb, vxlan->cfg.flags, md);
1768 /* Note that GBP and GPE can never be active together. This is
1769 * ensured in vxlan_dev_configure.
1770 */
1771
1772 if (!raw_proto) {
1773 reason = vxlan_set_mac(vxlan, vs, skb, vni);
1774 if (reason)
1775 goto drop;
1776 } else {
1777 skb_reset_mac_header(skb);
1778 skb->dev = vxlan->dev;
1779 skb->pkt_type = PACKET_HOST;
1780 }
1781
1782 /* Save offset of outer header relative to skb->head,
1783 * because we are going to reset the network header to the inner header
1784 * and might change skb->head.
1785 */
1786 nh = skb_network_header(skb) - skb->head;
1787
1788 skb_reset_network_header(skb);
1789
1790 reason = pskb_inet_may_pull_reason(skb);
1791 if (reason) {
1792 DEV_STATS_INC(vxlan->dev, rx_length_errors);
1793 DEV_STATS_INC(vxlan->dev, rx_errors);
1794 vxlan_vnifilter_count(vxlan, vni, vninode,
1795 VXLAN_VNI_STATS_RX_ERRORS, 0);
1796 goto drop;
1797 }
1798
1799 /* Get the outer header. */
1800 oiph = skb->head + nh;
1801
1802 if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
1803 reason = SKB_DROP_REASON_IP_TUNNEL_ECN;
1804 DEV_STATS_INC(vxlan->dev, rx_frame_errors);
1805 DEV_STATS_INC(vxlan->dev, rx_errors);
1806 vxlan_vnifilter_count(vxlan, vni, vninode,
1807 VXLAN_VNI_STATS_RX_ERRORS, 0);
1808 goto drop;
1809 }
1810
1811 rcu_read_lock();
1812
1813 if (unlikely(!(vxlan->dev->flags & IFF_UP))) {
1814 rcu_read_unlock();
1815 dev_dstats_rx_dropped(vxlan->dev);
1816 vxlan_vnifilter_count(vxlan, vni, vninode,
1817 VXLAN_VNI_STATS_RX_DROPS, 0);
1818 reason = SKB_DROP_REASON_DEV_READY;
1819 goto drop;
1820 }
1821
1822 dev_dstats_rx_add(vxlan->dev, skb->len);
1823 vxlan_vnifilter_count(vxlan, vni, vninode, VXLAN_VNI_STATS_RX, skb->len);
1824 gro_cells_receive(&vxlan->gro_cells, skb);
1825
1826 rcu_read_unlock();
1827
1828 return 0;
1829
1830 drop:
1831 reason = reason ?: SKB_DROP_REASON_NOT_SPECIFIED;
1832 /* Consume bad packet */
1833 kfree_skb_reason(skb, reason);
1834 return 0;
1835 }
1836
1837 /* 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)1838 static int vxlan_err_lookup(struct sock *sk, struct sk_buff *skb)
1839 {
1840 struct vxlan_dev *vxlan;
1841 struct vxlan_sock *vs;
1842 struct vxlanhdr *hdr;
1843 __be32 vni;
1844
1845 if (!pskb_may_pull(skb, skb_transport_offset(skb) + VXLAN_HLEN))
1846 return -EINVAL;
1847
1848 hdr = vxlan_hdr(skb);
1849
1850 if (!(hdr->vx_flags & VXLAN_HF_VNI))
1851 return -EINVAL;
1852
1853 vs = rcu_dereference_sk_user_data(sk);
1854 if (!vs)
1855 return -ENOENT;
1856
1857 vni = vxlan_vni(hdr->vx_vni);
1858 vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni, NULL);
1859 if (!vxlan)
1860 return -ENOENT;
1861
1862 return 0;
1863 }
1864
arp_reduce(struct net_device * dev,struct sk_buff * skb,__be32 vni)1865 static int arp_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
1866 {
1867 struct vxlan_dev *vxlan = netdev_priv(dev);
1868 struct arphdr *parp;
1869 u8 *arpptr, *sha;
1870 __be32 sip, tip;
1871 struct neighbour *n;
1872
1873 if (dev->flags & IFF_NOARP)
1874 goto out;
1875
1876 if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1877 dev_dstats_tx_dropped(dev);
1878 vxlan_vnifilter_count(vxlan, vni, NULL,
1879 VXLAN_VNI_STATS_TX_DROPS, 0);
1880 goto out;
1881 }
1882 parp = arp_hdr(skb);
1883
1884 if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1885 parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1886 parp->ar_pro != htons(ETH_P_IP) ||
1887 parp->ar_op != htons(ARPOP_REQUEST) ||
1888 parp->ar_hln != dev->addr_len ||
1889 parp->ar_pln != 4)
1890 goto out;
1891 arpptr = (u8 *)parp + sizeof(struct arphdr);
1892 sha = arpptr;
1893 arpptr += dev->addr_len; /* sha */
1894 memcpy(&sip, arpptr, sizeof(sip));
1895 arpptr += sizeof(sip);
1896 arpptr += dev->addr_len; /* tha */
1897 memcpy(&tip, arpptr, sizeof(tip));
1898
1899 if (ipv4_is_loopback(tip) ||
1900 ipv4_is_multicast(tip))
1901 goto out;
1902
1903 n = neigh_lookup(&arp_tbl, &tip, dev);
1904
1905 if (n) {
1906 struct vxlan_fdb *f;
1907 struct sk_buff *reply;
1908
1909 if (!(READ_ONCE(n->nud_state) & NUD_CONNECTED)) {
1910 neigh_release(n);
1911 goto out;
1912 }
1913
1914 f = vxlan_find_mac(vxlan, n->ha, vni);
1915 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1916 /* bridge-local neighbor */
1917 neigh_release(n);
1918 goto out;
1919 }
1920
1921 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1922 n->ha, sha);
1923
1924 neigh_release(n);
1925
1926 if (reply == NULL)
1927 goto out;
1928
1929 skb_reset_mac_header(reply);
1930 __skb_pull(reply, skb_network_offset(reply));
1931 reply->ip_summed = CHECKSUM_UNNECESSARY;
1932 reply->pkt_type = PACKET_HOST;
1933
1934 if (netif_rx(reply) == NET_RX_DROP) {
1935 dev_dstats_rx_dropped(dev);
1936 vxlan_vnifilter_count(vxlan, vni, NULL,
1937 VXLAN_VNI_STATS_RX_DROPS, 0);
1938 }
1939
1940 } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
1941 union vxlan_addr ipa = {
1942 .sin.sin_addr.s_addr = tip,
1943 .sin.sin_family = AF_INET,
1944 };
1945
1946 vxlan_ip_miss(dev, &ipa);
1947 }
1948 out:
1949 consume_skb(skb);
1950 return NETDEV_TX_OK;
1951 }
1952
1953 #if IS_ENABLED(CONFIG_IPV6)
vxlan_na_create(struct sk_buff * request,struct neighbour * n,bool isrouter)1954 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1955 struct neighbour *n, bool isrouter)
1956 {
1957 struct net_device *dev = request->dev;
1958 struct sk_buff *reply;
1959 struct nd_msg *ns, *na;
1960 struct ipv6hdr *pip6;
1961 u8 *daddr;
1962 int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1963 int ns_olen;
1964 int i, len;
1965
1966 if (dev == NULL || !pskb_may_pull(request, request->len))
1967 return NULL;
1968
1969 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1970 sizeof(*na) + na_olen + dev->needed_tailroom;
1971 reply = alloc_skb(len, GFP_ATOMIC);
1972 if (reply == NULL)
1973 return NULL;
1974
1975 reply->protocol = htons(ETH_P_IPV6);
1976 reply->dev = dev;
1977 skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1978 skb_push(reply, sizeof(struct ethhdr));
1979 skb_reset_mac_header(reply);
1980
1981 ns = (struct nd_msg *)(ipv6_hdr(request) + 1);
1982
1983 daddr = eth_hdr(request)->h_source;
1984 ns_olen = request->len - skb_network_offset(request) -
1985 sizeof(struct ipv6hdr) - sizeof(*ns);
1986 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1987 if (!ns->opt[i + 1]) {
1988 kfree_skb(reply);
1989 return NULL;
1990 }
1991 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1992 daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1993 break;
1994 }
1995 }
1996
1997 /* Ethernet header */
1998 ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1999 ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
2000 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
2001 reply->protocol = htons(ETH_P_IPV6);
2002
2003 skb_pull(reply, sizeof(struct ethhdr));
2004 skb_reset_network_header(reply);
2005 skb_put(reply, sizeof(struct ipv6hdr));
2006
2007 /* IPv6 header */
2008
2009 pip6 = ipv6_hdr(reply);
2010 memset(pip6, 0, sizeof(struct ipv6hdr));
2011 pip6->version = 6;
2012 pip6->priority = ipv6_hdr(request)->priority;
2013 pip6->nexthdr = IPPROTO_ICMPV6;
2014 pip6->hop_limit = 255;
2015 pip6->daddr = ipv6_hdr(request)->saddr;
2016 pip6->saddr = *(struct in6_addr *)n->primary_key;
2017
2018 skb_pull(reply, sizeof(struct ipv6hdr));
2019 skb_reset_transport_header(reply);
2020
2021 /* Neighbor Advertisement */
2022 na = skb_put_zero(reply, sizeof(*na) + na_olen);
2023 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
2024 na->icmph.icmp6_router = isrouter;
2025 na->icmph.icmp6_override = 1;
2026 na->icmph.icmp6_solicited = 1;
2027 na->target = ns->target;
2028 ether_addr_copy(&na->opt[2], n->ha);
2029 na->opt[0] = ND_OPT_TARGET_LL_ADDR;
2030 na->opt[1] = na_olen >> 3;
2031
2032 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
2033 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
2034 csum_partial(na, sizeof(*na)+na_olen, 0));
2035
2036 pip6->payload_len = htons(sizeof(*na)+na_olen);
2037
2038 skb_push(reply, sizeof(struct ipv6hdr));
2039
2040 reply->ip_summed = CHECKSUM_UNNECESSARY;
2041
2042 return reply;
2043 }
2044
neigh_reduce(struct net_device * dev,struct sk_buff * skb,__be32 vni)2045 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
2046 {
2047 struct vxlan_dev *vxlan = netdev_priv(dev);
2048 const struct in6_addr *daddr;
2049 const struct ipv6hdr *iphdr;
2050 struct inet6_dev *in6_dev;
2051 struct neighbour *n;
2052 struct nd_msg *msg;
2053
2054 rcu_read_lock();
2055 in6_dev = __in6_dev_get(dev);
2056 if (!in6_dev)
2057 goto out;
2058
2059 iphdr = ipv6_hdr(skb);
2060 daddr = &iphdr->daddr;
2061 msg = (struct nd_msg *)(iphdr + 1);
2062
2063 if (ipv6_addr_loopback(daddr) ||
2064 ipv6_addr_is_multicast(&msg->target))
2065 goto out;
2066
2067 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
2068
2069 if (n) {
2070 struct vxlan_fdb *f;
2071 struct sk_buff *reply;
2072
2073 if (!(READ_ONCE(n->nud_state) & NUD_CONNECTED)) {
2074 neigh_release(n);
2075 goto out;
2076 }
2077
2078 f = vxlan_find_mac(vxlan, n->ha, vni);
2079 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
2080 /* bridge-local neighbor */
2081 neigh_release(n);
2082 goto out;
2083 }
2084
2085 reply = vxlan_na_create(skb, n,
2086 !!(f ? f->flags & NTF_ROUTER : 0));
2087
2088 neigh_release(n);
2089
2090 if (reply == NULL)
2091 goto out;
2092
2093 if (netif_rx(reply) == NET_RX_DROP) {
2094 dev_dstats_rx_dropped(dev);
2095 vxlan_vnifilter_count(vxlan, vni, NULL,
2096 VXLAN_VNI_STATS_RX_DROPS, 0);
2097 }
2098 } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
2099 union vxlan_addr ipa = {
2100 .sin6.sin6_addr = msg->target,
2101 .sin6.sin6_family = AF_INET6,
2102 };
2103
2104 vxlan_ip_miss(dev, &ipa);
2105 }
2106
2107 out:
2108 rcu_read_unlock();
2109 consume_skb(skb);
2110 return NETDEV_TX_OK;
2111 }
2112 #endif
2113
route_shortcircuit(struct net_device * dev,struct sk_buff * skb)2114 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
2115 {
2116 struct vxlan_dev *vxlan = netdev_priv(dev);
2117 struct neighbour *n;
2118
2119 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
2120 return false;
2121
2122 n = NULL;
2123 switch (ntohs(eth_hdr(skb)->h_proto)) {
2124 case ETH_P_IP:
2125 {
2126 struct iphdr *pip;
2127
2128 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
2129 return false;
2130 pip = ip_hdr(skb);
2131 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
2132 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
2133 union vxlan_addr ipa = {
2134 .sin.sin_addr.s_addr = pip->daddr,
2135 .sin.sin_family = AF_INET,
2136 };
2137
2138 vxlan_ip_miss(dev, &ipa);
2139 return false;
2140 }
2141
2142 break;
2143 }
2144 #if IS_ENABLED(CONFIG_IPV6)
2145 case ETH_P_IPV6:
2146 {
2147 struct ipv6hdr *pip6;
2148
2149 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
2150 return false;
2151 pip6 = ipv6_hdr(skb);
2152 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
2153 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
2154 union vxlan_addr ipa = {
2155 .sin6.sin6_addr = pip6->daddr,
2156 .sin6.sin6_family = AF_INET6,
2157 };
2158
2159 vxlan_ip_miss(dev, &ipa);
2160 return false;
2161 }
2162
2163 break;
2164 }
2165 #endif
2166 default:
2167 return false;
2168 }
2169
2170 if (n) {
2171 bool diff;
2172
2173 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
2174 if (diff) {
2175 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
2176 dev->addr_len);
2177 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
2178 }
2179 neigh_release(n);
2180 return diff;
2181 }
2182
2183 return false;
2184 }
2185
vxlan_build_gpe_hdr(struct vxlanhdr * vxh,__be16 protocol)2186 static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, __be16 protocol)
2187 {
2188 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh;
2189
2190 gpe->np_applied = 1;
2191 gpe->next_protocol = tun_p_from_eth_p(protocol);
2192 if (!gpe->next_protocol)
2193 return -EPFNOSUPPORT;
2194 return 0;
2195 }
2196
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)2197 static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
2198 int iphdr_len, __be32 vni,
2199 struct vxlan_metadata *md, u32 vxflags,
2200 bool udp_sum)
2201 {
2202 struct vxlanhdr *vxh;
2203 int min_headroom;
2204 int err;
2205 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
2206 __be16 inner_protocol = htons(ETH_P_TEB);
2207
2208 if ((vxflags & VXLAN_F_REMCSUM_TX) &&
2209 skb->ip_summed == CHECKSUM_PARTIAL) {
2210 int csum_start = skb_checksum_start_offset(skb);
2211
2212 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
2213 !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
2214 (skb->csum_offset == offsetof(struct udphdr, check) ||
2215 skb->csum_offset == offsetof(struct tcphdr, check)))
2216 type |= SKB_GSO_TUNNEL_REMCSUM;
2217 }
2218
2219 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
2220 + VXLAN_HLEN + iphdr_len;
2221
2222 /* Need space for new headers (invalidates iph ptr) */
2223 err = skb_cow_head(skb, min_headroom);
2224 if (unlikely(err))
2225 return err;
2226
2227 err = iptunnel_handle_offloads(skb, type);
2228 if (err)
2229 return err;
2230
2231 vxh = __skb_push(skb, sizeof(*vxh));
2232 vxh->vx_flags = VXLAN_HF_VNI;
2233 vxh->vx_vni = vxlan_vni_field(vni);
2234
2235 if (type & SKB_GSO_TUNNEL_REMCSUM) {
2236 unsigned int start;
2237
2238 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
2239 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
2240 vxh->vx_flags |= VXLAN_HF_RCO;
2241
2242 if (!skb_is_gso(skb)) {
2243 skb->ip_summed = CHECKSUM_NONE;
2244 skb->encapsulation = 0;
2245 }
2246 }
2247
2248 if (vxflags & VXLAN_F_GBP)
2249 vxlan_build_gbp_hdr(vxh, md);
2250 if (vxflags & VXLAN_F_GPE) {
2251 err = vxlan_build_gpe_hdr(vxh, skb->protocol);
2252 if (err < 0)
2253 return err;
2254 inner_protocol = skb->protocol;
2255 }
2256
2257 skb_set_inner_protocol(skb, inner_protocol);
2258 return 0;
2259 }
2260
2261 /* 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)2262 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
2263 struct vxlan_dev *dst_vxlan, __be32 vni,
2264 bool snoop)
2265 {
2266 union vxlan_addr loopback;
2267 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
2268 unsigned int len = skb->len;
2269 struct net_device *dev;
2270
2271 skb->pkt_type = PACKET_HOST;
2272 skb->encapsulation = 0;
2273 skb->dev = dst_vxlan->dev;
2274 __skb_pull(skb, skb_network_offset(skb));
2275
2276 if (remote_ip->sa.sa_family == AF_INET) {
2277 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
2278 loopback.sa.sa_family = AF_INET;
2279 #if IS_ENABLED(CONFIG_IPV6)
2280 } else {
2281 loopback.sin6.sin6_addr = in6addr_loopback;
2282 loopback.sa.sa_family = AF_INET6;
2283 #endif
2284 }
2285
2286 rcu_read_lock();
2287 dev = skb->dev;
2288 if (unlikely(!(dev->flags & IFF_UP))) {
2289 kfree_skb_reason(skb, SKB_DROP_REASON_DEV_READY);
2290 goto drop;
2291 }
2292
2293 if ((dst_vxlan->cfg.flags & VXLAN_F_LEARN) && snoop)
2294 vxlan_snoop(dev, &loopback, eth_hdr(skb)->h_source, 0, vni);
2295
2296 dev_dstats_tx_add(src_vxlan->dev, len);
2297 vxlan_vnifilter_count(src_vxlan, vni, NULL, VXLAN_VNI_STATS_TX, len);
2298
2299 if (__netif_rx(skb) == NET_RX_SUCCESS) {
2300 dev_dstats_rx_add(dst_vxlan->dev, len);
2301 vxlan_vnifilter_count(dst_vxlan, vni, NULL, VXLAN_VNI_STATS_RX,
2302 len);
2303 } else {
2304 drop:
2305 dev_dstats_rx_dropped(dev);
2306 vxlan_vnifilter_count(dst_vxlan, vni, NULL,
2307 VXLAN_VNI_STATS_RX_DROPS, 0);
2308 }
2309 rcu_read_unlock();
2310 }
2311
encap_bypass_if_local(struct sk_buff * skb,struct net_device * dev,struct vxlan_dev * vxlan,int addr_family,__be16 dst_port,int dst_ifindex,__be32 vni,struct dst_entry * dst,u32 rt_flags)2312 static int encap_bypass_if_local(struct sk_buff *skb, struct net_device *dev,
2313 struct vxlan_dev *vxlan,
2314 int addr_family,
2315 __be16 dst_port, int dst_ifindex, __be32 vni,
2316 struct dst_entry *dst,
2317 u32 rt_flags)
2318 {
2319 #if IS_ENABLED(CONFIG_IPV6)
2320 /* IPv6 rt-flags are checked against RTF_LOCAL, but the value of
2321 * RTF_LOCAL is equal to RTCF_LOCAL. So to keep code simple
2322 * we can use RTCF_LOCAL which works for ipv4 and ipv6 route entry.
2323 */
2324 BUILD_BUG_ON(RTCF_LOCAL != RTF_LOCAL);
2325 #endif
2326 /* Bypass encapsulation if the destination is local */
2327 if (rt_flags & RTCF_LOCAL &&
2328 !(rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) &&
2329 vxlan->cfg.flags & VXLAN_F_LOCALBYPASS) {
2330 struct vxlan_dev *dst_vxlan;
2331
2332 dst_release(dst);
2333 dst_vxlan = vxlan_find_vni(vxlan->net, dst_ifindex, vni,
2334 addr_family, dst_port,
2335 vxlan->cfg.flags);
2336 if (!dst_vxlan) {
2337 DEV_STATS_INC(dev, tx_errors);
2338 vxlan_vnifilter_count(vxlan, vni, NULL,
2339 VXLAN_VNI_STATS_TX_ERRORS, 0);
2340 kfree_skb_reason(skb, SKB_DROP_REASON_VXLAN_VNI_NOT_FOUND);
2341
2342 return -ENOENT;
2343 }
2344 vxlan_encap_bypass(skb, vxlan, dst_vxlan, vni, true);
2345 return 1;
2346 }
2347
2348 return 0;
2349 }
2350
vxlan_xmit_one(struct sk_buff * skb,struct net_device * dev,__be32 default_vni,struct vxlan_rdst * rdst,bool did_rsc)2351 void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
2352 __be32 default_vni, struct vxlan_rdst *rdst, bool did_rsc)
2353 {
2354 struct dst_cache *dst_cache;
2355 struct ip_tunnel_info *info;
2356 struct ip_tunnel_key *pkey;
2357 struct ip_tunnel_key key;
2358 struct vxlan_dev *vxlan = netdev_priv(dev);
2359 const struct iphdr *old_iph;
2360 struct vxlan_metadata _md;
2361 struct vxlan_metadata *md = &_md;
2362 unsigned int pkt_len = skb->len;
2363 __be16 src_port = 0, dst_port;
2364 struct dst_entry *ndst = NULL;
2365 int addr_family;
2366 __u8 tos, ttl;
2367 int ifindex;
2368 int err;
2369 u32 flags = vxlan->cfg.flags;
2370 bool use_cache;
2371 bool udp_sum = false;
2372 bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
2373 enum skb_drop_reason reason;
2374 bool no_eth_encap;
2375 __be32 vni = 0;
2376
2377 no_eth_encap = flags & VXLAN_F_GPE && skb->protocol != htons(ETH_P_TEB);
2378 reason = skb_vlan_inet_prepare(skb, no_eth_encap);
2379 if (reason)
2380 goto drop;
2381
2382 reason = SKB_DROP_REASON_NOT_SPECIFIED;
2383 old_iph = ip_hdr(skb);
2384
2385 info = skb_tunnel_info(skb);
2386 use_cache = ip_tunnel_dst_cache_usable(skb, info);
2387
2388 if (rdst) {
2389 memset(&key, 0, sizeof(key));
2390 pkey = &key;
2391
2392 if (vxlan_addr_any(&rdst->remote_ip)) {
2393 if (did_rsc) {
2394 /* short-circuited back to local bridge */
2395 vxlan_encap_bypass(skb, vxlan, vxlan,
2396 default_vni, true);
2397 return;
2398 }
2399 goto drop;
2400 }
2401
2402 addr_family = vxlan->cfg.saddr.sa.sa_family;
2403 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
2404 vni = (rdst->remote_vni) ? : default_vni;
2405 ifindex = rdst->remote_ifindex;
2406
2407 if (addr_family == AF_INET) {
2408 key.u.ipv4.src = vxlan->cfg.saddr.sin.sin_addr.s_addr;
2409 key.u.ipv4.dst = rdst->remote_ip.sin.sin_addr.s_addr;
2410 } else {
2411 key.u.ipv6.src = vxlan->cfg.saddr.sin6.sin6_addr;
2412 key.u.ipv6.dst = rdst->remote_ip.sin6.sin6_addr;
2413 }
2414
2415 dst_cache = &rdst->dst_cache;
2416 md->gbp = skb->mark;
2417 if (flags & VXLAN_F_TTL_INHERIT) {
2418 ttl = ip_tunnel_get_ttl(old_iph, skb);
2419 } else {
2420 ttl = vxlan->cfg.ttl;
2421 if (!ttl && vxlan_addr_multicast(&rdst->remote_ip))
2422 ttl = 1;
2423 }
2424 tos = vxlan->cfg.tos;
2425 if (tos == 1)
2426 tos = ip_tunnel_get_dsfield(old_iph, skb);
2427 if (tos && !info)
2428 use_cache = false;
2429
2430 if (addr_family == AF_INET)
2431 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
2432 else
2433 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2434 #if IS_ENABLED(CONFIG_IPV6)
2435 switch (vxlan->cfg.label_policy) {
2436 case VXLAN_LABEL_FIXED:
2437 key.label = vxlan->cfg.label;
2438 break;
2439 case VXLAN_LABEL_INHERIT:
2440 key.label = ip_tunnel_get_flowlabel(old_iph, skb);
2441 break;
2442 default:
2443 DEBUG_NET_WARN_ON_ONCE(1);
2444 goto drop;
2445 }
2446 #endif
2447 } else {
2448 if (!info) {
2449 WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
2450 dev->name);
2451 goto drop;
2452 }
2453 pkey = &info->key;
2454 addr_family = ip_tunnel_info_af(info);
2455 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
2456 vni = tunnel_id_to_key32(info->key.tun_id);
2457 ifindex = 0;
2458 dst_cache = &info->dst_cache;
2459 if (test_bit(IP_TUNNEL_VXLAN_OPT_BIT, info->key.tun_flags)) {
2460 if (info->options_len < sizeof(*md))
2461 goto drop;
2462 md = ip_tunnel_info_opts(info);
2463 }
2464 ttl = info->key.ttl;
2465 tos = info->key.tos;
2466 udp_sum = test_bit(IP_TUNNEL_CSUM_BIT, info->key.tun_flags);
2467 }
2468 src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2469 vxlan->cfg.port_max, true);
2470
2471 rcu_read_lock();
2472 if (addr_family == AF_INET) {
2473 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
2474 struct rtable *rt;
2475 __be16 df = 0;
2476 __be32 saddr;
2477
2478 if (!ifindex)
2479 ifindex = sock4->sock->sk->sk_bound_dev_if;
2480
2481 rt = udp_tunnel_dst_lookup(skb, dev, vxlan->net, ifindex,
2482 &saddr, pkey, src_port, dst_port,
2483 tos, use_cache ? dst_cache : NULL);
2484 if (IS_ERR(rt)) {
2485 err = PTR_ERR(rt);
2486 reason = SKB_DROP_REASON_IP_OUTNOROUTES;
2487 goto tx_error;
2488 }
2489
2490 if (!info) {
2491 /* Bypass encapsulation if the destination is local */
2492 err = encap_bypass_if_local(skb, dev, vxlan, AF_INET,
2493 dst_port, ifindex, vni,
2494 &rt->dst, rt->rt_flags);
2495 if (err)
2496 goto out_unlock;
2497
2498 if (vxlan->cfg.df == VXLAN_DF_SET) {
2499 df = htons(IP_DF);
2500 } else if (vxlan->cfg.df == VXLAN_DF_INHERIT) {
2501 struct ethhdr *eth = eth_hdr(skb);
2502
2503 if (ntohs(eth->h_proto) == ETH_P_IPV6 ||
2504 (ntohs(eth->h_proto) == ETH_P_IP &&
2505 old_iph->frag_off & htons(IP_DF)))
2506 df = htons(IP_DF);
2507 }
2508 } else if (test_bit(IP_TUNNEL_DONT_FRAGMENT_BIT,
2509 info->key.tun_flags)) {
2510 df = htons(IP_DF);
2511 }
2512
2513 ndst = &rt->dst;
2514 err = skb_tunnel_check_pmtu(skb, ndst, vxlan_headroom(flags & VXLAN_F_GPE),
2515 netif_is_any_bridge_port(dev));
2516 if (err < 0) {
2517 goto tx_error;
2518 } else if (err) {
2519 if (info) {
2520 struct ip_tunnel_info *unclone;
2521
2522 unclone = skb_tunnel_info_unclone(skb);
2523 if (unlikely(!unclone))
2524 goto tx_error;
2525
2526 unclone->key.u.ipv4.src = pkey->u.ipv4.dst;
2527 unclone->key.u.ipv4.dst = saddr;
2528 }
2529 vxlan_encap_bypass(skb, vxlan, vxlan, vni, false);
2530 dst_release(ndst);
2531 goto out_unlock;
2532 }
2533
2534 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2535 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2536 err = vxlan_build_skb(skb, ndst, sizeof(struct iphdr),
2537 vni, md, flags, udp_sum);
2538 if (err < 0) {
2539 reason = SKB_DROP_REASON_NOMEM;
2540 goto tx_error;
2541 }
2542
2543 udp_tunnel_xmit_skb(rt, sock4->sock->sk, skb, saddr,
2544 pkey->u.ipv4.dst, tos, ttl, df,
2545 src_port, dst_port, xnet, !udp_sum);
2546 #if IS_ENABLED(CONFIG_IPV6)
2547 } else {
2548 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
2549 struct in6_addr saddr;
2550
2551 if (!ifindex)
2552 ifindex = sock6->sock->sk->sk_bound_dev_if;
2553
2554 ndst = udp_tunnel6_dst_lookup(skb, dev, vxlan->net, sock6->sock,
2555 ifindex, &saddr, pkey,
2556 src_port, dst_port, tos,
2557 use_cache ? dst_cache : NULL);
2558 if (IS_ERR(ndst)) {
2559 err = PTR_ERR(ndst);
2560 ndst = NULL;
2561 reason = SKB_DROP_REASON_IP_OUTNOROUTES;
2562 goto tx_error;
2563 }
2564
2565 if (!info) {
2566 u32 rt6i_flags = dst_rt6_info(ndst)->rt6i_flags;
2567
2568 err = encap_bypass_if_local(skb, dev, vxlan, AF_INET6,
2569 dst_port, ifindex, vni,
2570 ndst, rt6i_flags);
2571 if (err)
2572 goto out_unlock;
2573 }
2574
2575 err = skb_tunnel_check_pmtu(skb, ndst,
2576 vxlan_headroom((flags & VXLAN_F_GPE) | VXLAN_F_IPV6),
2577 netif_is_any_bridge_port(dev));
2578 if (err < 0) {
2579 goto tx_error;
2580 } else if (err) {
2581 if (info) {
2582 struct ip_tunnel_info *unclone;
2583
2584 unclone = skb_tunnel_info_unclone(skb);
2585 if (unlikely(!unclone))
2586 goto tx_error;
2587
2588 unclone->key.u.ipv6.src = pkey->u.ipv6.dst;
2589 unclone->key.u.ipv6.dst = saddr;
2590 }
2591
2592 vxlan_encap_bypass(skb, vxlan, vxlan, vni, false);
2593 dst_release(ndst);
2594 goto out_unlock;
2595 }
2596
2597 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2598 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2599 skb_scrub_packet(skb, xnet);
2600 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
2601 vni, md, flags, udp_sum);
2602 if (err < 0) {
2603 reason = SKB_DROP_REASON_NOMEM;
2604 goto tx_error;
2605 }
2606
2607 udp_tunnel6_xmit_skb(ndst, sock6->sock->sk, skb, dev,
2608 &saddr, &pkey->u.ipv6.dst, tos, ttl,
2609 pkey->label, src_port, dst_port, !udp_sum);
2610 #endif
2611 }
2612 vxlan_vnifilter_count(vxlan, vni, NULL, VXLAN_VNI_STATS_TX, pkt_len);
2613 out_unlock:
2614 rcu_read_unlock();
2615 return;
2616
2617 drop:
2618 dev_dstats_tx_dropped(dev);
2619 vxlan_vnifilter_count(vxlan, vni, NULL, VXLAN_VNI_STATS_TX_DROPS, 0);
2620 kfree_skb_reason(skb, reason);
2621 return;
2622
2623 tx_error:
2624 rcu_read_unlock();
2625 if (err == -ELOOP)
2626 DEV_STATS_INC(dev, collisions);
2627 else if (err == -ENETUNREACH)
2628 DEV_STATS_INC(dev, tx_carrier_errors);
2629 dst_release(ndst);
2630 DEV_STATS_INC(dev, tx_errors);
2631 vxlan_vnifilter_count(vxlan, vni, NULL, VXLAN_VNI_STATS_TX_ERRORS, 0);
2632 kfree_skb_reason(skb, reason);
2633 }
2634
vxlan_xmit_nh(struct sk_buff * skb,struct net_device * dev,struct vxlan_fdb * f,__be32 vni,bool did_rsc)2635 static void vxlan_xmit_nh(struct sk_buff *skb, struct net_device *dev,
2636 struct vxlan_fdb *f, __be32 vni, bool did_rsc)
2637 {
2638 struct vxlan_rdst nh_rdst;
2639 struct nexthop *nh;
2640 bool do_xmit;
2641 u32 hash;
2642
2643 memset(&nh_rdst, 0, sizeof(struct vxlan_rdst));
2644 hash = skb_get_hash(skb);
2645
2646 rcu_read_lock();
2647 nh = rcu_dereference(f->nh);
2648 if (!nh) {
2649 rcu_read_unlock();
2650 goto drop;
2651 }
2652 do_xmit = vxlan_fdb_nh_path_select(nh, hash, &nh_rdst);
2653 rcu_read_unlock();
2654
2655 if (likely(do_xmit))
2656 vxlan_xmit_one(skb, dev, vni, &nh_rdst, did_rsc);
2657 else
2658 goto drop;
2659
2660 return;
2661
2662 drop:
2663 dev_dstats_tx_dropped(dev);
2664 vxlan_vnifilter_count(netdev_priv(dev), vni, NULL,
2665 VXLAN_VNI_STATS_TX_DROPS, 0);
2666 dev_kfree_skb(skb);
2667 }
2668
vxlan_xmit_nhid(struct sk_buff * skb,struct net_device * dev,u32 nhid,__be32 vni)2669 static netdev_tx_t vxlan_xmit_nhid(struct sk_buff *skb, struct net_device *dev,
2670 u32 nhid, __be32 vni)
2671 {
2672 struct vxlan_dev *vxlan = netdev_priv(dev);
2673 struct vxlan_rdst nh_rdst;
2674 struct nexthop *nh;
2675 bool do_xmit;
2676 u32 hash;
2677
2678 memset(&nh_rdst, 0, sizeof(struct vxlan_rdst));
2679 hash = skb_get_hash(skb);
2680
2681 rcu_read_lock();
2682 nh = nexthop_find_by_id(dev_net(dev), nhid);
2683 if (unlikely(!nh || !nexthop_is_fdb(nh) || !nexthop_is_multipath(nh))) {
2684 rcu_read_unlock();
2685 goto drop;
2686 }
2687 do_xmit = vxlan_fdb_nh_path_select(nh, hash, &nh_rdst);
2688 rcu_read_unlock();
2689
2690 if (vxlan->cfg.saddr.sa.sa_family != nh_rdst.remote_ip.sa.sa_family)
2691 goto drop;
2692
2693 if (likely(do_xmit))
2694 vxlan_xmit_one(skb, dev, vni, &nh_rdst, false);
2695 else
2696 goto drop;
2697
2698 return NETDEV_TX_OK;
2699
2700 drop:
2701 dev_dstats_tx_dropped(dev);
2702 vxlan_vnifilter_count(netdev_priv(dev), vni, NULL,
2703 VXLAN_VNI_STATS_TX_DROPS, 0);
2704 dev_kfree_skb(skb);
2705 return NETDEV_TX_OK;
2706 }
2707
2708 /* Transmit local packets over Vxlan
2709 *
2710 * Outer IP header inherits ECN and DF from inner header.
2711 * Outer UDP destination is the VXLAN assigned port.
2712 * source port is based on hash of flow
2713 */
vxlan_xmit(struct sk_buff * skb,struct net_device * dev)2714 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2715 {
2716 struct vxlan_dev *vxlan = netdev_priv(dev);
2717 struct vxlan_rdst *rdst, *fdst = NULL;
2718 const struct ip_tunnel_info *info;
2719 struct vxlan_fdb *f;
2720 struct ethhdr *eth;
2721 __be32 vni = 0;
2722 u32 nhid = 0;
2723 bool did_rsc;
2724
2725 info = skb_tunnel_info(skb);
2726
2727 skb_reset_mac_header(skb);
2728
2729 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
2730 if (info && info->mode & IP_TUNNEL_INFO_BRIDGE &&
2731 info->mode & IP_TUNNEL_INFO_TX) {
2732 vni = tunnel_id_to_key32(info->key.tun_id);
2733 nhid = info->key.nhid;
2734 } else {
2735 if (info && info->mode & IP_TUNNEL_INFO_TX)
2736 vxlan_xmit_one(skb, dev, vni, NULL, false);
2737 else
2738 kfree_skb_reason(skb, SKB_DROP_REASON_TUNNEL_TXINFO);
2739 return NETDEV_TX_OK;
2740 }
2741 }
2742
2743 if (vxlan->cfg.flags & VXLAN_F_PROXY) {
2744 eth = eth_hdr(skb);
2745 if (ntohs(eth->h_proto) == ETH_P_ARP)
2746 return arp_reduce(dev, skb, vni);
2747 #if IS_ENABLED(CONFIG_IPV6)
2748 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2749 pskb_may_pull(skb, sizeof(struct ipv6hdr) +
2750 sizeof(struct nd_msg)) &&
2751 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2752 struct nd_msg *m = (struct nd_msg *)(ipv6_hdr(skb) + 1);
2753
2754 if (m->icmph.icmp6_code == 0 &&
2755 m->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2756 return neigh_reduce(dev, skb, vni);
2757 }
2758 #endif
2759 }
2760
2761 if (nhid)
2762 return vxlan_xmit_nhid(skb, dev, nhid, vni);
2763
2764 if (vxlan->cfg.flags & VXLAN_F_MDB) {
2765 struct vxlan_mdb_entry *mdb_entry;
2766
2767 rcu_read_lock();
2768 mdb_entry = vxlan_mdb_entry_skb_get(vxlan, skb, vni);
2769 if (mdb_entry) {
2770 netdev_tx_t ret;
2771
2772 ret = vxlan_mdb_xmit(vxlan, mdb_entry, skb);
2773 rcu_read_unlock();
2774 return ret;
2775 }
2776 rcu_read_unlock();
2777 }
2778
2779 eth = eth_hdr(skb);
2780 f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2781 did_rsc = false;
2782
2783 if (f && (f->flags & NTF_ROUTER) && (vxlan->cfg.flags & VXLAN_F_RSC) &&
2784 (ntohs(eth->h_proto) == ETH_P_IP ||
2785 ntohs(eth->h_proto) == ETH_P_IPV6)) {
2786 did_rsc = route_shortcircuit(dev, skb);
2787 if (did_rsc)
2788 f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2789 }
2790
2791 if (f == NULL) {
2792 f = vxlan_find_mac(vxlan, all_zeros_mac, vni);
2793 if (f == NULL) {
2794 if ((vxlan->cfg.flags & VXLAN_F_L2MISS) &&
2795 !is_multicast_ether_addr(eth->h_dest))
2796 vxlan_fdb_miss(vxlan, eth->h_dest);
2797
2798 dev_dstats_tx_dropped(dev);
2799 vxlan_vnifilter_count(vxlan, vni, NULL,
2800 VXLAN_VNI_STATS_TX_DROPS, 0);
2801 kfree_skb_reason(skb, SKB_DROP_REASON_NO_TX_TARGET);
2802 return NETDEV_TX_OK;
2803 }
2804 }
2805
2806 if (rcu_access_pointer(f->nh)) {
2807 vxlan_xmit_nh(skb, dev, f,
2808 (vni ? : vxlan->default_dst.remote_vni), did_rsc);
2809 } else {
2810 list_for_each_entry_rcu(rdst, &f->remotes, list) {
2811 struct sk_buff *skb1;
2812
2813 if (!fdst) {
2814 fdst = rdst;
2815 continue;
2816 }
2817 skb1 = skb_clone(skb, GFP_ATOMIC);
2818 if (skb1)
2819 vxlan_xmit_one(skb1, dev, vni, rdst, did_rsc);
2820 }
2821 if (fdst)
2822 vxlan_xmit_one(skb, dev, vni, fdst, did_rsc);
2823 else
2824 kfree_skb_reason(skb, SKB_DROP_REASON_NO_TX_TARGET);
2825 }
2826
2827 return NETDEV_TX_OK;
2828 }
2829
2830 /* Walk the forwarding table and purge stale entries */
vxlan_cleanup(struct timer_list * t)2831 static void vxlan_cleanup(struct timer_list *t)
2832 {
2833 struct vxlan_dev *vxlan = from_timer(vxlan, t, age_timer);
2834 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2835 unsigned int h;
2836
2837 if (!netif_running(vxlan->dev))
2838 return;
2839
2840 for (h = 0; h < FDB_HASH_SIZE; ++h) {
2841 struct hlist_node *p, *n;
2842
2843 spin_lock(&vxlan->hash_lock[h]);
2844 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2845 struct vxlan_fdb *f
2846 = container_of(p, struct vxlan_fdb, hlist);
2847 unsigned long timeout;
2848
2849 if (f->state & (NUD_PERMANENT | NUD_NOARP))
2850 continue;
2851
2852 if (f->flags & NTF_EXT_LEARNED)
2853 continue;
2854
2855 timeout = f->used + vxlan->cfg.age_interval * HZ;
2856 if (time_before_eq(timeout, jiffies)) {
2857 netdev_dbg(vxlan->dev,
2858 "garbage collect %pM\n",
2859 f->eth_addr);
2860 f->state = NUD_STALE;
2861 vxlan_fdb_destroy(vxlan, f, true, true);
2862 } else if (time_before(timeout, next_timer))
2863 next_timer = timeout;
2864 }
2865 spin_unlock(&vxlan->hash_lock[h]);
2866 }
2867
2868 mod_timer(&vxlan->age_timer, next_timer);
2869 }
2870
vxlan_vs_del_dev(struct vxlan_dev * vxlan)2871 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan)
2872 {
2873 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2874
2875 spin_lock(&vn->sock_lock);
2876 hlist_del_init_rcu(&vxlan->hlist4.hlist);
2877 #if IS_ENABLED(CONFIG_IPV6)
2878 hlist_del_init_rcu(&vxlan->hlist6.hlist);
2879 #endif
2880 spin_unlock(&vn->sock_lock);
2881 }
2882
vxlan_vs_add_dev(struct vxlan_sock * vs,struct vxlan_dev * vxlan,struct vxlan_dev_node * node)2883 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan,
2884 struct vxlan_dev_node *node)
2885 {
2886 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2887 __be32 vni = vxlan->default_dst.remote_vni;
2888
2889 node->vxlan = vxlan;
2890 spin_lock(&vn->sock_lock);
2891 hlist_add_head_rcu(&node->hlist, vni_head(vs, vni));
2892 spin_unlock(&vn->sock_lock);
2893 }
2894
2895 /* Setup stats when device is created */
vxlan_init(struct net_device * dev)2896 static int vxlan_init(struct net_device *dev)
2897 {
2898 struct vxlan_dev *vxlan = netdev_priv(dev);
2899 int err;
2900
2901 if (vxlan->cfg.flags & VXLAN_F_VNIFILTER) {
2902 err = vxlan_vnigroup_init(vxlan);
2903 if (err)
2904 return err;
2905 }
2906
2907 err = gro_cells_init(&vxlan->gro_cells, dev);
2908 if (err)
2909 goto err_vnigroup_uninit;
2910
2911 err = vxlan_mdb_init(vxlan);
2912 if (err)
2913 goto err_gro_cells_destroy;
2914
2915 netdev_lockdep_set_classes(dev);
2916 return 0;
2917
2918 err_gro_cells_destroy:
2919 gro_cells_destroy(&vxlan->gro_cells);
2920 err_vnigroup_uninit:
2921 if (vxlan->cfg.flags & VXLAN_F_VNIFILTER)
2922 vxlan_vnigroup_uninit(vxlan);
2923 return err;
2924 }
2925
vxlan_fdb_delete_default(struct vxlan_dev * vxlan,__be32 vni)2926 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan, __be32 vni)
2927 {
2928 struct vxlan_fdb *f;
2929 u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, vni);
2930
2931 spin_lock_bh(&vxlan->hash_lock[hash_index]);
2932 f = __vxlan_find_mac(vxlan, all_zeros_mac, vni);
2933 if (f)
2934 vxlan_fdb_destroy(vxlan, f, true, true);
2935 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
2936 }
2937
vxlan_uninit(struct net_device * dev)2938 static void vxlan_uninit(struct net_device *dev)
2939 {
2940 struct vxlan_dev *vxlan = netdev_priv(dev);
2941
2942 vxlan_mdb_fini(vxlan);
2943
2944 if (vxlan->cfg.flags & VXLAN_F_VNIFILTER)
2945 vxlan_vnigroup_uninit(vxlan);
2946
2947 gro_cells_destroy(&vxlan->gro_cells);
2948
2949 vxlan_fdb_delete_default(vxlan, vxlan->cfg.vni);
2950 }
2951
2952 /* Start ageing timer and join group when device is brought up */
vxlan_open(struct net_device * dev)2953 static int vxlan_open(struct net_device *dev)
2954 {
2955 struct vxlan_dev *vxlan = netdev_priv(dev);
2956 int ret;
2957
2958 ret = vxlan_sock_add(vxlan);
2959 if (ret < 0)
2960 return ret;
2961
2962 ret = vxlan_multicast_join(vxlan);
2963 if (ret) {
2964 vxlan_sock_release(vxlan);
2965 return ret;
2966 }
2967
2968 if (vxlan->cfg.age_interval)
2969 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2970
2971 return ret;
2972 }
2973
2974 struct vxlan_fdb_flush_desc {
2975 bool ignore_default_entry;
2976 unsigned long state;
2977 unsigned long state_mask;
2978 unsigned long flags;
2979 unsigned long flags_mask;
2980 __be32 src_vni;
2981 u32 nhid;
2982 __be32 vni;
2983 __be16 port;
2984 union vxlan_addr dst_ip;
2985 };
2986
vxlan_fdb_is_default_entry(const struct vxlan_fdb * f,const struct vxlan_dev * vxlan)2987 static bool vxlan_fdb_is_default_entry(const struct vxlan_fdb *f,
2988 const struct vxlan_dev *vxlan)
2989 {
2990 return is_zero_ether_addr(f->eth_addr) && f->vni == vxlan->cfg.vni;
2991 }
2992
vxlan_fdb_nhid_matches(const struct vxlan_fdb * f,u32 nhid)2993 static bool vxlan_fdb_nhid_matches(const struct vxlan_fdb *f, u32 nhid)
2994 {
2995 struct nexthop *nh = rtnl_dereference(f->nh);
2996
2997 return nh && nh->id == nhid;
2998 }
2999
vxlan_fdb_flush_matches(const struct vxlan_fdb * f,const struct vxlan_dev * vxlan,const struct vxlan_fdb_flush_desc * desc)3000 static bool vxlan_fdb_flush_matches(const struct vxlan_fdb *f,
3001 const struct vxlan_dev *vxlan,
3002 const struct vxlan_fdb_flush_desc *desc)
3003 {
3004 if (desc->state_mask && (f->state & desc->state_mask) != desc->state)
3005 return false;
3006
3007 if (desc->flags_mask && (f->flags & desc->flags_mask) != desc->flags)
3008 return false;
3009
3010 if (desc->ignore_default_entry && vxlan_fdb_is_default_entry(f, vxlan))
3011 return false;
3012
3013 if (desc->src_vni && f->vni != desc->src_vni)
3014 return false;
3015
3016 if (desc->nhid && !vxlan_fdb_nhid_matches(f, desc->nhid))
3017 return false;
3018
3019 return true;
3020 }
3021
3022 static bool
vxlan_fdb_flush_should_match_remotes(const struct vxlan_fdb_flush_desc * desc)3023 vxlan_fdb_flush_should_match_remotes(const struct vxlan_fdb_flush_desc *desc)
3024 {
3025 return desc->vni || desc->port || desc->dst_ip.sa.sa_family;
3026 }
3027
3028 static bool
vxlan_fdb_flush_remote_matches(const struct vxlan_fdb_flush_desc * desc,const struct vxlan_rdst * rd)3029 vxlan_fdb_flush_remote_matches(const struct vxlan_fdb_flush_desc *desc,
3030 const struct vxlan_rdst *rd)
3031 {
3032 if (desc->vni && rd->remote_vni != desc->vni)
3033 return false;
3034
3035 if (desc->port && rd->remote_port != desc->port)
3036 return false;
3037
3038 if (desc->dst_ip.sa.sa_family &&
3039 !vxlan_addr_equal(&rd->remote_ip, &desc->dst_ip))
3040 return false;
3041
3042 return true;
3043 }
3044
3045 static void
vxlan_fdb_flush_match_remotes(struct vxlan_fdb * f,struct vxlan_dev * vxlan,const struct vxlan_fdb_flush_desc * desc,bool * p_destroy_fdb)3046 vxlan_fdb_flush_match_remotes(struct vxlan_fdb *f, struct vxlan_dev *vxlan,
3047 const struct vxlan_fdb_flush_desc *desc,
3048 bool *p_destroy_fdb)
3049 {
3050 bool remotes_flushed = false;
3051 struct vxlan_rdst *rd, *tmp;
3052
3053 list_for_each_entry_safe(rd, tmp, &f->remotes, list) {
3054 if (!vxlan_fdb_flush_remote_matches(desc, rd))
3055 continue;
3056
3057 vxlan_fdb_dst_destroy(vxlan, f, rd, true);
3058 remotes_flushed = true;
3059 }
3060
3061 *p_destroy_fdb = remotes_flushed && list_empty(&f->remotes);
3062 }
3063
3064 /* Purge the forwarding table */
vxlan_flush(struct vxlan_dev * vxlan,const struct vxlan_fdb_flush_desc * desc)3065 static void vxlan_flush(struct vxlan_dev *vxlan,
3066 const struct vxlan_fdb_flush_desc *desc)
3067 {
3068 bool match_remotes = vxlan_fdb_flush_should_match_remotes(desc);
3069 unsigned int h;
3070
3071 for (h = 0; h < FDB_HASH_SIZE; ++h) {
3072 struct hlist_node *p, *n;
3073
3074 spin_lock_bh(&vxlan->hash_lock[h]);
3075 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
3076 struct vxlan_fdb *f
3077 = container_of(p, struct vxlan_fdb, hlist);
3078
3079 if (!vxlan_fdb_flush_matches(f, vxlan, desc))
3080 continue;
3081
3082 if (match_remotes) {
3083 bool destroy_fdb = false;
3084
3085 vxlan_fdb_flush_match_remotes(f, vxlan, desc,
3086 &destroy_fdb);
3087
3088 if (!destroy_fdb)
3089 continue;
3090 }
3091
3092 vxlan_fdb_destroy(vxlan, f, true, true);
3093 }
3094 spin_unlock_bh(&vxlan->hash_lock[h]);
3095 }
3096 }
3097
3098 static const struct nla_policy vxlan_del_bulk_policy[NDA_MAX + 1] = {
3099 [NDA_SRC_VNI] = { .type = NLA_U32 },
3100 [NDA_NH_ID] = { .type = NLA_U32 },
3101 [NDA_VNI] = { .type = NLA_U32 },
3102 [NDA_PORT] = { .type = NLA_U16 },
3103 [NDA_DST] = NLA_POLICY_RANGE(NLA_BINARY, sizeof(struct in_addr),
3104 sizeof(struct in6_addr)),
3105 [NDA_NDM_STATE_MASK] = { .type = NLA_U16 },
3106 [NDA_NDM_FLAGS_MASK] = { .type = NLA_U8 },
3107 };
3108
3109 #define VXLAN_FDB_FLUSH_IGNORED_NDM_FLAGS (NTF_MASTER | NTF_SELF)
3110 #define VXLAN_FDB_FLUSH_ALLOWED_NDM_STATES (NUD_PERMANENT | NUD_NOARP)
3111 #define VXLAN_FDB_FLUSH_ALLOWED_NDM_FLAGS (NTF_EXT_LEARNED | NTF_OFFLOADED | \
3112 NTF_ROUTER)
3113
vxlan_fdb_delete_bulk(struct nlmsghdr * nlh,struct net_device * dev,struct netlink_ext_ack * extack)3114 static int vxlan_fdb_delete_bulk(struct nlmsghdr *nlh, struct net_device *dev,
3115 struct netlink_ext_ack *extack)
3116 {
3117 struct vxlan_dev *vxlan = netdev_priv(dev);
3118 struct vxlan_fdb_flush_desc desc = {};
3119 struct ndmsg *ndm = nlmsg_data(nlh);
3120 struct nlattr *tb[NDA_MAX + 1];
3121 u8 ndm_flags;
3122 int err;
3123
3124 ndm_flags = ndm->ndm_flags & ~VXLAN_FDB_FLUSH_IGNORED_NDM_FLAGS;
3125
3126 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, vxlan_del_bulk_policy,
3127 extack);
3128 if (err)
3129 return err;
3130
3131 if (ndm_flags & ~VXLAN_FDB_FLUSH_ALLOWED_NDM_FLAGS) {
3132 NL_SET_ERR_MSG(extack, "Unsupported fdb flush ndm flag bits set");
3133 return -EINVAL;
3134 }
3135 if (ndm->ndm_state & ~VXLAN_FDB_FLUSH_ALLOWED_NDM_STATES) {
3136 NL_SET_ERR_MSG(extack, "Unsupported fdb flush ndm state bits set");
3137 return -EINVAL;
3138 }
3139
3140 desc.state = ndm->ndm_state;
3141 desc.flags = ndm_flags;
3142
3143 if (tb[NDA_NDM_STATE_MASK])
3144 desc.state_mask = nla_get_u16(tb[NDA_NDM_STATE_MASK]);
3145
3146 if (tb[NDA_NDM_FLAGS_MASK])
3147 desc.flags_mask = nla_get_u8(tb[NDA_NDM_FLAGS_MASK]);
3148
3149 if (tb[NDA_SRC_VNI])
3150 desc.src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI]));
3151
3152 if (tb[NDA_NH_ID])
3153 desc.nhid = nla_get_u32(tb[NDA_NH_ID]);
3154
3155 if (tb[NDA_VNI])
3156 desc.vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
3157
3158 if (tb[NDA_PORT])
3159 desc.port = nla_get_be16(tb[NDA_PORT]);
3160
3161 if (tb[NDA_DST]) {
3162 union vxlan_addr ip;
3163
3164 err = vxlan_nla_get_addr(&ip, tb[NDA_DST]);
3165 if (err) {
3166 NL_SET_ERR_MSG_ATTR(extack, tb[NDA_DST],
3167 "Unsupported address family");
3168 return err;
3169 }
3170 desc.dst_ip = ip;
3171 }
3172
3173 vxlan_flush(vxlan, &desc);
3174
3175 return 0;
3176 }
3177
3178 /* Cleanup timer and forwarding table on shutdown */
vxlan_stop(struct net_device * dev)3179 static int vxlan_stop(struct net_device *dev)
3180 {
3181 struct vxlan_dev *vxlan = netdev_priv(dev);
3182 struct vxlan_fdb_flush_desc desc = {
3183 /* Default entry is deleted at vxlan_uninit. */
3184 .ignore_default_entry = true,
3185 .state = 0,
3186 .state_mask = NUD_PERMANENT | NUD_NOARP,
3187 };
3188
3189 vxlan_multicast_leave(vxlan);
3190
3191 del_timer_sync(&vxlan->age_timer);
3192
3193 vxlan_flush(vxlan, &desc);
3194 vxlan_sock_release(vxlan);
3195
3196 return 0;
3197 }
3198
3199 /* Stub, nothing needs to be done. */
vxlan_set_multicast_list(struct net_device * dev)3200 static void vxlan_set_multicast_list(struct net_device *dev)
3201 {
3202 }
3203
vxlan_change_mtu(struct net_device * dev,int new_mtu)3204 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
3205 {
3206 struct vxlan_dev *vxlan = netdev_priv(dev);
3207 struct vxlan_rdst *dst = &vxlan->default_dst;
3208 struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
3209 dst->remote_ifindex);
3210
3211 /* This check is different than dev->max_mtu, because it looks at
3212 * the lowerdev->mtu, rather than the static dev->max_mtu
3213 */
3214 if (lowerdev) {
3215 int max_mtu = lowerdev->mtu - vxlan_headroom(vxlan->cfg.flags);
3216 if (new_mtu > max_mtu)
3217 return -EINVAL;
3218 }
3219
3220 WRITE_ONCE(dev->mtu, new_mtu);
3221 return 0;
3222 }
3223
vxlan_fill_metadata_dst(struct net_device * dev,struct sk_buff * skb)3224 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
3225 {
3226 struct vxlan_dev *vxlan = netdev_priv(dev);
3227 struct ip_tunnel_info *info = skb_tunnel_info(skb);
3228 __be16 sport, dport;
3229
3230 sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
3231 vxlan->cfg.port_max, true);
3232 dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
3233
3234 if (ip_tunnel_info_af(info) == AF_INET) {
3235 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
3236 struct rtable *rt;
3237
3238 if (!sock4)
3239 return -EIO;
3240
3241 rt = udp_tunnel_dst_lookup(skb, dev, vxlan->net, 0,
3242 &info->key.u.ipv4.src,
3243 &info->key,
3244 sport, dport, info->key.tos,
3245 &info->dst_cache);
3246 if (IS_ERR(rt))
3247 return PTR_ERR(rt);
3248 ip_rt_put(rt);
3249 } else {
3250 #if IS_ENABLED(CONFIG_IPV6)
3251 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
3252 struct dst_entry *ndst;
3253
3254 if (!sock6)
3255 return -EIO;
3256
3257 ndst = udp_tunnel6_dst_lookup(skb, dev, vxlan->net, sock6->sock,
3258 0, &info->key.u.ipv6.src,
3259 &info->key,
3260 sport, dport, info->key.tos,
3261 &info->dst_cache);
3262 if (IS_ERR(ndst))
3263 return PTR_ERR(ndst);
3264 dst_release(ndst);
3265 #else /* !CONFIG_IPV6 */
3266 return -EPFNOSUPPORT;
3267 #endif
3268 }
3269 info->key.tp_src = sport;
3270 info->key.tp_dst = dport;
3271 return 0;
3272 }
3273
3274 static const struct net_device_ops vxlan_netdev_ether_ops = {
3275 .ndo_init = vxlan_init,
3276 .ndo_uninit = vxlan_uninit,
3277 .ndo_open = vxlan_open,
3278 .ndo_stop = vxlan_stop,
3279 .ndo_start_xmit = vxlan_xmit,
3280 .ndo_set_rx_mode = vxlan_set_multicast_list,
3281 .ndo_change_mtu = vxlan_change_mtu,
3282 .ndo_validate_addr = eth_validate_addr,
3283 .ndo_set_mac_address = eth_mac_addr,
3284 .ndo_fdb_add = vxlan_fdb_add,
3285 .ndo_fdb_del = vxlan_fdb_delete,
3286 .ndo_fdb_del_bulk = vxlan_fdb_delete_bulk,
3287 .ndo_fdb_dump = vxlan_fdb_dump,
3288 .ndo_fdb_get = vxlan_fdb_get,
3289 .ndo_mdb_add = vxlan_mdb_add,
3290 .ndo_mdb_del = vxlan_mdb_del,
3291 .ndo_mdb_del_bulk = vxlan_mdb_del_bulk,
3292 .ndo_mdb_dump = vxlan_mdb_dump,
3293 .ndo_mdb_get = vxlan_mdb_get,
3294 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
3295 };
3296
3297 static const struct net_device_ops vxlan_netdev_raw_ops = {
3298 .ndo_init = vxlan_init,
3299 .ndo_uninit = vxlan_uninit,
3300 .ndo_open = vxlan_open,
3301 .ndo_stop = vxlan_stop,
3302 .ndo_start_xmit = vxlan_xmit,
3303 .ndo_change_mtu = vxlan_change_mtu,
3304 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
3305 };
3306
3307 /* Info for udev, that this is a virtual tunnel endpoint */
3308 static const struct device_type vxlan_type = {
3309 .name = "vxlan",
3310 };
3311
3312 /* Calls the ndo_udp_tunnel_add of the caller in order to
3313 * supply the listening VXLAN udp ports. Callers are expected
3314 * to implement the ndo_udp_tunnel_add.
3315 */
vxlan_offload_rx_ports(struct net_device * dev,bool push)3316 static void vxlan_offload_rx_ports(struct net_device *dev, bool push)
3317 {
3318 struct vxlan_sock *vs;
3319 struct net *net = dev_net(dev);
3320 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3321 unsigned int i;
3322
3323 spin_lock(&vn->sock_lock);
3324 for (i = 0; i < PORT_HASH_SIZE; ++i) {
3325 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
3326 unsigned short type;
3327
3328 if (vs->flags & VXLAN_F_GPE)
3329 type = UDP_TUNNEL_TYPE_VXLAN_GPE;
3330 else
3331 type = UDP_TUNNEL_TYPE_VXLAN;
3332
3333 if (push)
3334 udp_tunnel_push_rx_port(dev, vs->sock, type);
3335 else
3336 udp_tunnel_drop_rx_port(dev, vs->sock, type);
3337 }
3338 }
3339 spin_unlock(&vn->sock_lock);
3340 }
3341
3342 /* Initialize the device structure. */
vxlan_setup(struct net_device * dev)3343 static void vxlan_setup(struct net_device *dev)
3344 {
3345 struct vxlan_dev *vxlan = netdev_priv(dev);
3346 unsigned int h;
3347
3348 eth_hw_addr_random(dev);
3349 ether_setup(dev);
3350
3351 dev->needs_free_netdev = true;
3352 SET_NETDEV_DEVTYPE(dev, &vxlan_type);
3353
3354 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST;
3355 dev->features |= NETIF_F_RXCSUM;
3356 dev->features |= NETIF_F_GSO_SOFTWARE;
3357
3358 dev->vlan_features = dev->features;
3359 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST;
3360 dev->hw_features |= NETIF_F_RXCSUM;
3361 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
3362 netif_keep_dst(dev);
3363 dev->priv_flags |= IFF_NO_QUEUE;
3364 dev->change_proto_down = true;
3365 dev->lltx = true;
3366
3367 /* MTU range: 68 - 65535 */
3368 dev->min_mtu = ETH_MIN_MTU;
3369 dev->max_mtu = ETH_MAX_MTU;
3370
3371 dev->pcpu_stat_type = NETDEV_PCPU_STAT_DSTATS;
3372 INIT_LIST_HEAD(&vxlan->next);
3373
3374 timer_setup(&vxlan->age_timer, vxlan_cleanup, TIMER_DEFERRABLE);
3375
3376 vxlan->dev = dev;
3377
3378 for (h = 0; h < FDB_HASH_SIZE; ++h) {
3379 spin_lock_init(&vxlan->hash_lock[h]);
3380 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
3381 }
3382 }
3383
vxlan_ether_setup(struct net_device * dev)3384 static void vxlan_ether_setup(struct net_device *dev)
3385 {
3386 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
3387 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
3388 dev->netdev_ops = &vxlan_netdev_ether_ops;
3389 }
3390
vxlan_raw_setup(struct net_device * dev)3391 static void vxlan_raw_setup(struct net_device *dev)
3392 {
3393 dev->header_ops = NULL;
3394 dev->type = ARPHRD_NONE;
3395 dev->hard_header_len = 0;
3396 dev->addr_len = 0;
3397 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
3398 dev->netdev_ops = &vxlan_netdev_raw_ops;
3399 }
3400
3401 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
3402 [IFLA_VXLAN_UNSPEC] = { .strict_start_type = IFLA_VXLAN_LOCALBYPASS },
3403 [IFLA_VXLAN_ID] = { .type = NLA_U32 },
3404 [IFLA_VXLAN_GROUP] = { .len = sizeof_field(struct iphdr, daddr) },
3405 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
3406 [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
3407 [IFLA_VXLAN_LOCAL] = { .len = sizeof_field(struct iphdr, saddr) },
3408 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
3409 [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
3410 [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
3411 [IFLA_VXLAN_LABEL] = { .type = NLA_U32 },
3412 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
3413 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
3414 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
3415 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
3416 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
3417 [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
3418 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
3419 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
3420 [IFLA_VXLAN_COLLECT_METADATA] = { .type = NLA_U8 },
3421 [IFLA_VXLAN_PORT] = { .type = NLA_U16 },
3422 [IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 },
3423 [IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
3424 [IFLA_VXLAN_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
3425 [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
3426 [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
3427 [IFLA_VXLAN_GBP] = { .type = NLA_FLAG, },
3428 [IFLA_VXLAN_GPE] = { .type = NLA_FLAG, },
3429 [IFLA_VXLAN_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG },
3430 [IFLA_VXLAN_TTL_INHERIT] = { .type = NLA_FLAG },
3431 [IFLA_VXLAN_DF] = { .type = NLA_U8 },
3432 [IFLA_VXLAN_VNIFILTER] = { .type = NLA_U8 },
3433 [IFLA_VXLAN_LOCALBYPASS] = NLA_POLICY_MAX(NLA_U8, 1),
3434 [IFLA_VXLAN_LABEL_POLICY] = NLA_POLICY_MAX(NLA_U32, VXLAN_LABEL_MAX),
3435 [IFLA_VXLAN_RESERVED_BITS] = NLA_POLICY_EXACT_LEN(sizeof(struct vxlanhdr)),
3436 };
3437
vxlan_validate(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)3438 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[],
3439 struct netlink_ext_ack *extack)
3440 {
3441 if (tb[IFLA_ADDRESS]) {
3442 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
3443 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
3444 "Provided link layer address is not Ethernet");
3445 return -EINVAL;
3446 }
3447
3448 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
3449 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
3450 "Provided Ethernet address is not unicast");
3451 return -EADDRNOTAVAIL;
3452 }
3453 }
3454
3455 if (tb[IFLA_MTU]) {
3456 u32 mtu = nla_get_u32(tb[IFLA_MTU]);
3457
3458 if (mtu < ETH_MIN_MTU || mtu > ETH_MAX_MTU) {
3459 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU],
3460 "MTU must be between 68 and 65535");
3461 return -EINVAL;
3462 }
3463 }
3464
3465 if (!data) {
3466 NL_SET_ERR_MSG(extack,
3467 "Required attributes not provided to perform the operation");
3468 return -EINVAL;
3469 }
3470
3471 if (data[IFLA_VXLAN_ID]) {
3472 u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
3473
3474 if (id >= VXLAN_N_VID) {
3475 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_ID],
3476 "VXLAN ID must be lower than 16777216");
3477 return -ERANGE;
3478 }
3479 }
3480
3481 if (data[IFLA_VXLAN_PORT_RANGE]) {
3482 const struct ifla_vxlan_port_range *p
3483 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
3484
3485 if (ntohs(p->high) < ntohs(p->low)) {
3486 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_PORT_RANGE],
3487 "Invalid source port range");
3488 return -EINVAL;
3489 }
3490 }
3491
3492 if (data[IFLA_VXLAN_DF]) {
3493 enum ifla_vxlan_df df = nla_get_u8(data[IFLA_VXLAN_DF]);
3494
3495 if (df < 0 || df > VXLAN_DF_MAX) {
3496 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_DF],
3497 "Invalid DF attribute");
3498 return -EINVAL;
3499 }
3500 }
3501
3502 return 0;
3503 }
3504
vxlan_get_drvinfo(struct net_device * netdev,struct ethtool_drvinfo * drvinfo)3505 static void vxlan_get_drvinfo(struct net_device *netdev,
3506 struct ethtool_drvinfo *drvinfo)
3507 {
3508 strscpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
3509 strscpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
3510 }
3511
vxlan_get_link_ksettings(struct net_device * dev,struct ethtool_link_ksettings * cmd)3512 static int vxlan_get_link_ksettings(struct net_device *dev,
3513 struct ethtool_link_ksettings *cmd)
3514 {
3515 struct vxlan_dev *vxlan = netdev_priv(dev);
3516 struct vxlan_rdst *dst = &vxlan->default_dst;
3517 struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
3518 dst->remote_ifindex);
3519
3520 if (!lowerdev) {
3521 cmd->base.duplex = DUPLEX_UNKNOWN;
3522 cmd->base.port = PORT_OTHER;
3523 cmd->base.speed = SPEED_UNKNOWN;
3524
3525 return 0;
3526 }
3527
3528 return __ethtool_get_link_ksettings(lowerdev, cmd);
3529 }
3530
3531 static const struct ethtool_ops vxlan_ethtool_ops = {
3532 .get_drvinfo = vxlan_get_drvinfo,
3533 .get_link = ethtool_op_get_link,
3534 .get_link_ksettings = vxlan_get_link_ksettings,
3535 };
3536
vxlan_create_sock(struct net * net,bool ipv6,__be16 port,u32 flags,int ifindex)3537 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
3538 __be16 port, u32 flags, int ifindex)
3539 {
3540 struct socket *sock;
3541 struct udp_port_cfg udp_conf;
3542 int err;
3543
3544 memset(&udp_conf, 0, sizeof(udp_conf));
3545
3546 if (ipv6) {
3547 udp_conf.family = AF_INET6;
3548 udp_conf.use_udp6_rx_checksums =
3549 !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
3550 udp_conf.ipv6_v6only = 1;
3551 } else {
3552 udp_conf.family = AF_INET;
3553 }
3554
3555 udp_conf.local_udp_port = port;
3556 udp_conf.bind_ifindex = ifindex;
3557
3558 /* Open UDP socket */
3559 err = udp_sock_create(net, &udp_conf, &sock);
3560 if (err < 0)
3561 return ERR_PTR(err);
3562
3563 udp_allow_gso(sock->sk);
3564 return sock;
3565 }
3566
3567 /* Create new listen socket if needed */
vxlan_socket_create(struct net * net,bool ipv6,__be16 port,u32 flags,int ifindex)3568 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
3569 __be16 port, u32 flags,
3570 int ifindex)
3571 {
3572 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3573 struct vxlan_sock *vs;
3574 struct socket *sock;
3575 unsigned int h;
3576 struct udp_tunnel_sock_cfg tunnel_cfg;
3577
3578 vs = kzalloc(sizeof(*vs), GFP_KERNEL);
3579 if (!vs)
3580 return ERR_PTR(-ENOMEM);
3581
3582 for (h = 0; h < VNI_HASH_SIZE; ++h)
3583 INIT_HLIST_HEAD(&vs->vni_list[h]);
3584
3585 sock = vxlan_create_sock(net, ipv6, port, flags, ifindex);
3586 if (IS_ERR(sock)) {
3587 kfree(vs);
3588 return ERR_CAST(sock);
3589 }
3590
3591 vs->sock = sock;
3592 refcount_set(&vs->refcnt, 1);
3593 vs->flags = (flags & VXLAN_F_RCV_FLAGS);
3594
3595 spin_lock(&vn->sock_lock);
3596 hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
3597 udp_tunnel_notify_add_rx_port(sock,
3598 (vs->flags & VXLAN_F_GPE) ?
3599 UDP_TUNNEL_TYPE_VXLAN_GPE :
3600 UDP_TUNNEL_TYPE_VXLAN);
3601 spin_unlock(&vn->sock_lock);
3602
3603 /* Mark socket as an encapsulation socket. */
3604 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
3605 tunnel_cfg.sk_user_data = vs;
3606 tunnel_cfg.encap_type = 1;
3607 tunnel_cfg.encap_rcv = vxlan_rcv;
3608 tunnel_cfg.encap_err_lookup = vxlan_err_lookup;
3609 tunnel_cfg.encap_destroy = NULL;
3610 if (vs->flags & VXLAN_F_GPE) {
3611 tunnel_cfg.gro_receive = vxlan_gpe_gro_receive;
3612 tunnel_cfg.gro_complete = vxlan_gpe_gro_complete;
3613 } else {
3614 tunnel_cfg.gro_receive = vxlan_gro_receive;
3615 tunnel_cfg.gro_complete = vxlan_gro_complete;
3616 }
3617
3618 setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
3619
3620 return vs;
3621 }
3622
__vxlan_sock_add(struct vxlan_dev * vxlan,bool ipv6)3623 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
3624 {
3625 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
3626 bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA;
3627 struct vxlan_sock *vs = NULL;
3628 struct vxlan_dev_node *node;
3629 int l3mdev_index = 0;
3630
3631 if (vxlan->cfg.remote_ifindex)
3632 l3mdev_index = l3mdev_master_upper_ifindex_by_index(
3633 vxlan->net, vxlan->cfg.remote_ifindex);
3634
3635 if (!vxlan->cfg.no_share) {
3636 spin_lock(&vn->sock_lock);
3637 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
3638 vxlan->cfg.dst_port, vxlan->cfg.flags,
3639 l3mdev_index);
3640 if (vs && !refcount_inc_not_zero(&vs->refcnt)) {
3641 spin_unlock(&vn->sock_lock);
3642 return -EBUSY;
3643 }
3644 spin_unlock(&vn->sock_lock);
3645 }
3646 if (!vs)
3647 vs = vxlan_socket_create(vxlan->net, ipv6,
3648 vxlan->cfg.dst_port, vxlan->cfg.flags,
3649 l3mdev_index);
3650 if (IS_ERR(vs))
3651 return PTR_ERR(vs);
3652 #if IS_ENABLED(CONFIG_IPV6)
3653 if (ipv6) {
3654 rcu_assign_pointer(vxlan->vn6_sock, vs);
3655 node = &vxlan->hlist6;
3656 } else
3657 #endif
3658 {
3659 rcu_assign_pointer(vxlan->vn4_sock, vs);
3660 node = &vxlan->hlist4;
3661 }
3662
3663 if (metadata && (vxlan->cfg.flags & VXLAN_F_VNIFILTER))
3664 vxlan_vs_add_vnigrp(vxlan, vs, ipv6);
3665 else
3666 vxlan_vs_add_dev(vs, vxlan, node);
3667
3668 return 0;
3669 }
3670
vxlan_sock_add(struct vxlan_dev * vxlan)3671 static int vxlan_sock_add(struct vxlan_dev *vxlan)
3672 {
3673 bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA;
3674 bool ipv6 = vxlan->cfg.flags & VXLAN_F_IPV6 || metadata;
3675 bool ipv4 = !ipv6 || metadata;
3676 int ret = 0;
3677
3678 RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
3679 #if IS_ENABLED(CONFIG_IPV6)
3680 RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
3681 if (ipv6) {
3682 ret = __vxlan_sock_add(vxlan, true);
3683 if (ret < 0 && ret != -EAFNOSUPPORT)
3684 ipv4 = false;
3685 }
3686 #endif
3687 if (ipv4)
3688 ret = __vxlan_sock_add(vxlan, false);
3689 if (ret < 0)
3690 vxlan_sock_release(vxlan);
3691 return ret;
3692 }
3693
vxlan_vni_in_use(struct net * src_net,struct vxlan_dev * vxlan,struct vxlan_config * conf,__be32 vni)3694 int vxlan_vni_in_use(struct net *src_net, struct vxlan_dev *vxlan,
3695 struct vxlan_config *conf, __be32 vni)
3696 {
3697 struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
3698 struct vxlan_dev *tmp;
3699
3700 list_for_each_entry(tmp, &vn->vxlan_list, next) {
3701 if (tmp == vxlan)
3702 continue;
3703 if (tmp->cfg.flags & VXLAN_F_VNIFILTER) {
3704 if (!vxlan_vnifilter_lookup(tmp, vni))
3705 continue;
3706 } else if (tmp->cfg.vni != vni) {
3707 continue;
3708 }
3709 if (tmp->cfg.dst_port != conf->dst_port)
3710 continue;
3711 if ((tmp->cfg.flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)) !=
3712 (conf->flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)))
3713 continue;
3714
3715 if ((conf->flags & VXLAN_F_IPV6_LINKLOCAL) &&
3716 tmp->cfg.remote_ifindex != conf->remote_ifindex)
3717 continue;
3718
3719 return -EEXIST;
3720 }
3721
3722 return 0;
3723 }
3724
vxlan_config_validate(struct net * src_net,struct vxlan_config * conf,struct net_device ** lower,struct vxlan_dev * old,struct netlink_ext_ack * extack)3725 static int vxlan_config_validate(struct net *src_net, struct vxlan_config *conf,
3726 struct net_device **lower,
3727 struct vxlan_dev *old,
3728 struct netlink_ext_ack *extack)
3729 {
3730 bool use_ipv6 = false;
3731
3732 if (conf->flags & VXLAN_F_GPE) {
3733 /* For now, allow GPE only together with
3734 * COLLECT_METADATA. This can be relaxed later; in such
3735 * case, the other side of the PtP link will have to be
3736 * provided.
3737 */
3738 if ((conf->flags & ~VXLAN_F_ALLOWED_GPE) ||
3739 !(conf->flags & VXLAN_F_COLLECT_METADATA)) {
3740 NL_SET_ERR_MSG(extack,
3741 "VXLAN GPE does not support this combination of attributes");
3742 return -EINVAL;
3743 }
3744 }
3745
3746 if (!conf->remote_ip.sa.sa_family && !conf->saddr.sa.sa_family) {
3747 /* Unless IPv6 is explicitly requested, assume IPv4 */
3748 conf->remote_ip.sa.sa_family = AF_INET;
3749 conf->saddr.sa.sa_family = AF_INET;
3750 } else if (!conf->remote_ip.sa.sa_family) {
3751 conf->remote_ip.sa.sa_family = conf->saddr.sa.sa_family;
3752 } else if (!conf->saddr.sa.sa_family) {
3753 conf->saddr.sa.sa_family = conf->remote_ip.sa.sa_family;
3754 }
3755
3756 if (conf->saddr.sa.sa_family != conf->remote_ip.sa.sa_family) {
3757 NL_SET_ERR_MSG(extack,
3758 "Local and remote address must be from the same family");
3759 return -EINVAL;
3760 }
3761
3762 if (vxlan_addr_multicast(&conf->saddr)) {
3763 NL_SET_ERR_MSG(extack, "Local address cannot be multicast");
3764 return -EINVAL;
3765 }
3766
3767 if (conf->saddr.sa.sa_family == AF_INET6) {
3768 if (!IS_ENABLED(CONFIG_IPV6)) {
3769 NL_SET_ERR_MSG(extack,
3770 "IPv6 support not enabled in the kernel");
3771 return -EPFNOSUPPORT;
3772 }
3773 use_ipv6 = true;
3774 conf->flags |= VXLAN_F_IPV6;
3775
3776 if (!(conf->flags & VXLAN_F_COLLECT_METADATA)) {
3777 int local_type =
3778 ipv6_addr_type(&conf->saddr.sin6.sin6_addr);
3779 int remote_type =
3780 ipv6_addr_type(&conf->remote_ip.sin6.sin6_addr);
3781
3782 if (local_type & IPV6_ADDR_LINKLOCAL) {
3783 if (!(remote_type & IPV6_ADDR_LINKLOCAL) &&
3784 (remote_type != IPV6_ADDR_ANY)) {
3785 NL_SET_ERR_MSG(extack,
3786 "Invalid combination of local and remote address scopes");
3787 return -EINVAL;
3788 }
3789
3790 conf->flags |= VXLAN_F_IPV6_LINKLOCAL;
3791 } else {
3792 if (remote_type ==
3793 (IPV6_ADDR_UNICAST | IPV6_ADDR_LINKLOCAL)) {
3794 NL_SET_ERR_MSG(extack,
3795 "Invalid combination of local and remote address scopes");
3796 return -EINVAL;
3797 }
3798
3799 conf->flags &= ~VXLAN_F_IPV6_LINKLOCAL;
3800 }
3801 }
3802 }
3803
3804 if (conf->label && !use_ipv6) {
3805 NL_SET_ERR_MSG(extack,
3806 "Label attribute only applies to IPv6 VXLAN devices");
3807 return -EINVAL;
3808 }
3809
3810 if (conf->label_policy && !use_ipv6) {
3811 NL_SET_ERR_MSG(extack,
3812 "Label policy only applies to IPv6 VXLAN devices");
3813 return -EINVAL;
3814 }
3815
3816 if (conf->remote_ifindex) {
3817 struct net_device *lowerdev;
3818
3819 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
3820 if (!lowerdev) {
3821 NL_SET_ERR_MSG(extack,
3822 "Invalid local interface, device not found");
3823 return -ENODEV;
3824 }
3825
3826 #if IS_ENABLED(CONFIG_IPV6)
3827 if (use_ipv6) {
3828 struct inet6_dev *idev = __in6_dev_get(lowerdev);
3829
3830 if (idev && idev->cnf.disable_ipv6) {
3831 NL_SET_ERR_MSG(extack,
3832 "IPv6 support disabled by administrator");
3833 return -EPERM;
3834 }
3835 }
3836 #endif
3837
3838 *lower = lowerdev;
3839 } else {
3840 if (vxlan_addr_multicast(&conf->remote_ip)) {
3841 NL_SET_ERR_MSG(extack,
3842 "Local interface required for multicast remote destination");
3843
3844 return -EINVAL;
3845 }
3846
3847 #if IS_ENABLED(CONFIG_IPV6)
3848 if (conf->flags & VXLAN_F_IPV6_LINKLOCAL) {
3849 NL_SET_ERR_MSG(extack,
3850 "Local interface required for link-local local/remote addresses");
3851 return -EINVAL;
3852 }
3853 #endif
3854
3855 *lower = NULL;
3856 }
3857
3858 if (!conf->dst_port) {
3859 if (conf->flags & VXLAN_F_GPE)
3860 conf->dst_port = htons(IANA_VXLAN_GPE_UDP_PORT);
3861 else
3862 conf->dst_port = htons(vxlan_port);
3863 }
3864
3865 if (!conf->age_interval)
3866 conf->age_interval = FDB_AGE_DEFAULT;
3867
3868 if (vxlan_vni_in_use(src_net, old, conf, conf->vni)) {
3869 NL_SET_ERR_MSG(extack,
3870 "A VXLAN device with the specified VNI already exists");
3871 return -EEXIST;
3872 }
3873
3874 return 0;
3875 }
3876
vxlan_config_apply(struct net_device * dev,struct vxlan_config * conf,struct net_device * lowerdev,struct net * src_net,bool changelink)3877 static void vxlan_config_apply(struct net_device *dev,
3878 struct vxlan_config *conf,
3879 struct net_device *lowerdev,
3880 struct net *src_net,
3881 bool changelink)
3882 {
3883 struct vxlan_dev *vxlan = netdev_priv(dev);
3884 struct vxlan_rdst *dst = &vxlan->default_dst;
3885 unsigned short needed_headroom = ETH_HLEN;
3886 int max_mtu = ETH_MAX_MTU;
3887 u32 flags = conf->flags;
3888
3889 if (!changelink) {
3890 if (flags & VXLAN_F_GPE)
3891 vxlan_raw_setup(dev);
3892 else
3893 vxlan_ether_setup(dev);
3894
3895 if (conf->mtu)
3896 dev->mtu = conf->mtu;
3897
3898 vxlan->net = src_net;
3899 }
3900
3901 dst->remote_vni = conf->vni;
3902
3903 memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
3904
3905 if (lowerdev) {
3906 dst->remote_ifindex = conf->remote_ifindex;
3907
3908 netif_inherit_tso_max(dev, lowerdev);
3909
3910 needed_headroom = lowerdev->hard_header_len;
3911 needed_headroom += lowerdev->needed_headroom;
3912
3913 dev->needed_tailroom = lowerdev->needed_tailroom;
3914
3915 max_mtu = lowerdev->mtu - vxlan_headroom(flags);
3916 if (max_mtu < ETH_MIN_MTU)
3917 max_mtu = ETH_MIN_MTU;
3918
3919 if (!changelink && !conf->mtu)
3920 dev->mtu = max_mtu;
3921 }
3922
3923 if (dev->mtu > max_mtu)
3924 dev->mtu = max_mtu;
3925
3926 if (flags & VXLAN_F_COLLECT_METADATA)
3927 flags |= VXLAN_F_IPV6;
3928 needed_headroom += vxlan_headroom(flags);
3929 dev->needed_headroom = needed_headroom;
3930
3931 memcpy(&vxlan->cfg, conf, sizeof(*conf));
3932 }
3933
vxlan_dev_configure(struct net * src_net,struct net_device * dev,struct vxlan_config * conf,bool changelink,struct netlink_ext_ack * extack)3934 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
3935 struct vxlan_config *conf, bool changelink,
3936 struct netlink_ext_ack *extack)
3937 {
3938 struct vxlan_dev *vxlan = netdev_priv(dev);
3939 struct net_device *lowerdev;
3940 int ret;
3941
3942 ret = vxlan_config_validate(src_net, conf, &lowerdev, vxlan, extack);
3943 if (ret)
3944 return ret;
3945
3946 vxlan_config_apply(dev, conf, lowerdev, src_net, changelink);
3947
3948 return 0;
3949 }
3950
__vxlan_dev_create(struct net * net,struct net_device * dev,struct vxlan_config * conf,struct netlink_ext_ack * extack)3951 static int __vxlan_dev_create(struct net *net, struct net_device *dev,
3952 struct vxlan_config *conf,
3953 struct netlink_ext_ack *extack)
3954 {
3955 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3956 struct vxlan_dev *vxlan = netdev_priv(dev);
3957 struct net_device *remote_dev = NULL;
3958 struct vxlan_fdb *f = NULL;
3959 bool unregister = false;
3960 struct vxlan_rdst *dst;
3961 int err;
3962
3963 dst = &vxlan->default_dst;
3964 err = vxlan_dev_configure(net, dev, conf, false, extack);
3965 if (err)
3966 return err;
3967
3968 dev->ethtool_ops = &vxlan_ethtool_ops;
3969
3970 /* create an fdb entry for a valid default destination */
3971 if (!vxlan_addr_any(&dst->remote_ip)) {
3972 err = vxlan_fdb_create(vxlan, all_zeros_mac,
3973 &dst->remote_ip,
3974 NUD_REACHABLE | NUD_PERMANENT,
3975 vxlan->cfg.dst_port,
3976 dst->remote_vni,
3977 dst->remote_vni,
3978 dst->remote_ifindex,
3979 NTF_SELF, 0, &f, extack);
3980 if (err)
3981 return err;
3982 }
3983
3984 err = register_netdevice(dev);
3985 if (err)
3986 goto errout;
3987 unregister = true;
3988
3989 if (dst->remote_ifindex) {
3990 remote_dev = __dev_get_by_index(net, dst->remote_ifindex);
3991 if (!remote_dev) {
3992 err = -ENODEV;
3993 goto errout;
3994 }
3995
3996 err = netdev_upper_dev_link(remote_dev, dev, extack);
3997 if (err)
3998 goto errout;
3999 }
4000
4001 err = rtnl_configure_link(dev, NULL, 0, NULL);
4002 if (err < 0)
4003 goto unlink;
4004
4005 if (f) {
4006 vxlan_fdb_insert(vxlan, all_zeros_mac, dst->remote_vni, f);
4007
4008 /* notify default fdb entry */
4009 err = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f),
4010 RTM_NEWNEIGH, true, extack);
4011 if (err) {
4012 vxlan_fdb_destroy(vxlan, f, false, false);
4013 if (remote_dev)
4014 netdev_upper_dev_unlink(remote_dev, dev);
4015 goto unregister;
4016 }
4017 }
4018
4019 list_add(&vxlan->next, &vn->vxlan_list);
4020 if (remote_dev)
4021 dst->remote_dev = remote_dev;
4022 return 0;
4023 unlink:
4024 if (remote_dev)
4025 netdev_upper_dev_unlink(remote_dev, dev);
4026 errout:
4027 /* unregister_netdevice() destroys the default FDB entry with deletion
4028 * notification. But the addition notification was not sent yet, so
4029 * destroy the entry by hand here.
4030 */
4031 if (f)
4032 __vxlan_fdb_free(f);
4033 unregister:
4034 if (unregister)
4035 unregister_netdevice(dev);
4036 return err;
4037 }
4038
4039 /* 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)4040 static int vxlan_nl2flag(struct vxlan_config *conf, struct nlattr *tb[],
4041 int attrtype, unsigned long mask, bool changelink,
4042 bool changelink_supported,
4043 struct netlink_ext_ack *extack)
4044 {
4045 unsigned long flags;
4046
4047 if (!tb[attrtype])
4048 return 0;
4049
4050 if (changelink && !changelink_supported) {
4051 vxlan_flag_attr_error(attrtype, extack);
4052 return -EOPNOTSUPP;
4053 }
4054
4055 if (vxlan_policy[attrtype].type == NLA_FLAG)
4056 flags = conf->flags | mask;
4057 else if (nla_get_u8(tb[attrtype]))
4058 flags = conf->flags | mask;
4059 else
4060 flags = conf->flags & ~mask;
4061
4062 conf->flags = flags;
4063
4064 return 0;
4065 }
4066
vxlan_nl2conf(struct nlattr * tb[],struct nlattr * data[],struct net_device * dev,struct vxlan_config * conf,bool changelink,struct netlink_ext_ack * extack)4067 static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[],
4068 struct net_device *dev, struct vxlan_config *conf,
4069 bool changelink, struct netlink_ext_ack *extack)
4070 {
4071 struct vxlanhdr used_bits = {
4072 .vx_flags = VXLAN_HF_VNI,
4073 .vx_vni = VXLAN_VNI_MASK,
4074 };
4075 struct vxlan_dev *vxlan = netdev_priv(dev);
4076 int err = 0;
4077
4078 memset(conf, 0, sizeof(*conf));
4079
4080 /* if changelink operation, start with old existing cfg */
4081 if (changelink)
4082 memcpy(conf, &vxlan->cfg, sizeof(*conf));
4083
4084 if (data[IFLA_VXLAN_ID]) {
4085 __be32 vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
4086
4087 if (changelink && (vni != conf->vni)) {
4088 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_ID], "Cannot change VNI");
4089 return -EOPNOTSUPP;
4090 }
4091 conf->vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
4092 }
4093
4094 if (data[IFLA_VXLAN_GROUP]) {
4095 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET)) {
4096 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP], "New group address family does not match old group");
4097 return -EOPNOTSUPP;
4098 }
4099
4100 conf->remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
4101 conf->remote_ip.sa.sa_family = AF_INET;
4102 } else if (data[IFLA_VXLAN_GROUP6]) {
4103 if (!IS_ENABLED(CONFIG_IPV6)) {
4104 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "IPv6 support not enabled in the kernel");
4105 return -EPFNOSUPPORT;
4106 }
4107
4108 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET6)) {
4109 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "New group address family does not match old group");
4110 return -EOPNOTSUPP;
4111 }
4112
4113 conf->remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
4114 conf->remote_ip.sa.sa_family = AF_INET6;
4115 }
4116
4117 if (data[IFLA_VXLAN_LOCAL]) {
4118 if (changelink && (conf->saddr.sa.sa_family != AF_INET)) {
4119 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL], "New local address family does not match old");
4120 return -EOPNOTSUPP;
4121 }
4122
4123 conf->saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
4124 conf->saddr.sa.sa_family = AF_INET;
4125 } else if (data[IFLA_VXLAN_LOCAL6]) {
4126 if (!IS_ENABLED(CONFIG_IPV6)) {
4127 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "IPv6 support not enabled in the kernel");
4128 return -EPFNOSUPPORT;
4129 }
4130
4131 if (changelink && (conf->saddr.sa.sa_family != AF_INET6)) {
4132 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "New local address family does not match old");
4133 return -EOPNOTSUPP;
4134 }
4135
4136 /* TODO: respect scope id */
4137 conf->saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
4138 conf->saddr.sa.sa_family = AF_INET6;
4139 }
4140
4141 if (data[IFLA_VXLAN_LINK])
4142 conf->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
4143
4144 if (data[IFLA_VXLAN_TOS])
4145 conf->tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
4146
4147 if (data[IFLA_VXLAN_TTL])
4148 conf->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
4149
4150 if (data[IFLA_VXLAN_TTL_INHERIT]) {
4151 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_TTL_INHERIT,
4152 VXLAN_F_TTL_INHERIT, changelink, false,
4153 extack);
4154 if (err)
4155 return err;
4156
4157 }
4158
4159 if (data[IFLA_VXLAN_LABEL])
4160 conf->label = nla_get_be32(data[IFLA_VXLAN_LABEL]) &
4161 IPV6_FLOWLABEL_MASK;
4162 if (data[IFLA_VXLAN_LABEL_POLICY])
4163 conf->label_policy = nla_get_u32(data[IFLA_VXLAN_LABEL_POLICY]);
4164
4165 if (data[IFLA_VXLAN_LEARNING]) {
4166 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_LEARNING,
4167 VXLAN_F_LEARN, changelink, true,
4168 extack);
4169 if (err)
4170 return err;
4171 } else if (!changelink) {
4172 /* default to learn on a new device */
4173 conf->flags |= VXLAN_F_LEARN;
4174 }
4175
4176 if (data[IFLA_VXLAN_AGEING])
4177 conf->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
4178
4179 if (data[IFLA_VXLAN_PROXY]) {
4180 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_PROXY,
4181 VXLAN_F_PROXY, changelink, false,
4182 extack);
4183 if (err)
4184 return err;
4185 }
4186
4187 if (data[IFLA_VXLAN_RSC]) {
4188 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_RSC,
4189 VXLAN_F_RSC, changelink, false,
4190 extack);
4191 if (err)
4192 return err;
4193 }
4194
4195 if (data[IFLA_VXLAN_L2MISS]) {
4196 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L2MISS,
4197 VXLAN_F_L2MISS, changelink, false,
4198 extack);
4199 if (err)
4200 return err;
4201 }
4202
4203 if (data[IFLA_VXLAN_L3MISS]) {
4204 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L3MISS,
4205 VXLAN_F_L3MISS, changelink, false,
4206 extack);
4207 if (err)
4208 return err;
4209 }
4210
4211 if (data[IFLA_VXLAN_LIMIT]) {
4212 if (changelink) {
4213 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LIMIT],
4214 "Cannot change limit");
4215 return -EOPNOTSUPP;
4216 }
4217 conf->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
4218 }
4219
4220 if (data[IFLA_VXLAN_COLLECT_METADATA]) {
4221 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_COLLECT_METADATA,
4222 VXLAN_F_COLLECT_METADATA, changelink, false,
4223 extack);
4224 if (err)
4225 return err;
4226 }
4227
4228 if (data[IFLA_VXLAN_PORT_RANGE]) {
4229 if (!changelink) {
4230 const struct ifla_vxlan_port_range *p
4231 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
4232 conf->port_min = ntohs(p->low);
4233 conf->port_max = ntohs(p->high);
4234 } else {
4235 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT_RANGE],
4236 "Cannot change port range");
4237 return -EOPNOTSUPP;
4238 }
4239 }
4240
4241 if (data[IFLA_VXLAN_PORT]) {
4242 if (changelink) {
4243 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT],
4244 "Cannot change port");
4245 return -EOPNOTSUPP;
4246 }
4247 conf->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
4248 }
4249
4250 if (data[IFLA_VXLAN_UDP_CSUM]) {
4251 if (changelink) {
4252 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_UDP_CSUM],
4253 "Cannot change UDP_CSUM flag");
4254 return -EOPNOTSUPP;
4255 }
4256 if (!nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
4257 conf->flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
4258 }
4259
4260 if (data[IFLA_VXLAN_LOCALBYPASS]) {
4261 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_LOCALBYPASS,
4262 VXLAN_F_LOCALBYPASS, changelink,
4263 true, extack);
4264 if (err)
4265 return err;
4266 } else if (!changelink) {
4267 /* default to local bypass on a new device */
4268 conf->flags |= VXLAN_F_LOCALBYPASS;
4269 }
4270
4271 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]) {
4272 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
4273 VXLAN_F_UDP_ZERO_CSUM6_TX, changelink,
4274 false, extack);
4275 if (err)
4276 return err;
4277 }
4278
4279 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]) {
4280 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
4281 VXLAN_F_UDP_ZERO_CSUM6_RX, changelink,
4282 false, extack);
4283 if (err)
4284 return err;
4285 }
4286
4287 if (data[IFLA_VXLAN_REMCSUM_TX]) {
4288 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_TX,
4289 VXLAN_F_REMCSUM_TX, changelink, false,
4290 extack);
4291 if (err)
4292 return err;
4293 }
4294
4295 if (data[IFLA_VXLAN_REMCSUM_RX]) {
4296 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_RX,
4297 VXLAN_F_REMCSUM_RX, changelink, false,
4298 extack);
4299 if (err)
4300 return err;
4301 used_bits.vx_flags |= VXLAN_HF_RCO;
4302 used_bits.vx_vni |= ~VXLAN_VNI_MASK;
4303 }
4304
4305 if (data[IFLA_VXLAN_GBP]) {
4306 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GBP,
4307 VXLAN_F_GBP, changelink, false, extack);
4308 if (err)
4309 return err;
4310 used_bits.vx_flags |= VXLAN_GBP_USED_BITS;
4311 }
4312
4313 if (data[IFLA_VXLAN_GPE]) {
4314 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GPE,
4315 VXLAN_F_GPE, changelink, false,
4316 extack);
4317 if (err)
4318 return err;
4319
4320 used_bits.vx_flags |= VXLAN_GPE_USED_BITS;
4321 }
4322
4323 if (data[IFLA_VXLAN_RESERVED_BITS]) {
4324 struct vxlanhdr reserved_bits;
4325
4326 if (changelink) {
4327 NL_SET_ERR_MSG_ATTR(extack,
4328 data[IFLA_VXLAN_RESERVED_BITS],
4329 "Cannot change reserved_bits");
4330 return -EOPNOTSUPP;
4331 }
4332
4333 nla_memcpy(&reserved_bits, data[IFLA_VXLAN_RESERVED_BITS],
4334 sizeof(reserved_bits));
4335 if (used_bits.vx_flags & reserved_bits.vx_flags ||
4336 used_bits.vx_vni & reserved_bits.vx_vni) {
4337 __be64 ub_be64, rb_be64;
4338
4339 memcpy(&ub_be64, &used_bits, sizeof(ub_be64));
4340 memcpy(&rb_be64, &reserved_bits, sizeof(rb_be64));
4341
4342 NL_SET_ERR_MSG_ATTR_FMT(extack,
4343 data[IFLA_VXLAN_RESERVED_BITS],
4344 "Used bits %#018llx cannot overlap reserved bits %#018llx",
4345 be64_to_cpu(ub_be64),
4346 be64_to_cpu(rb_be64));
4347 return -EINVAL;
4348 }
4349
4350 conf->reserved_bits = reserved_bits;
4351 } else {
4352 /* For backwards compatibility, only allow reserved fields to be
4353 * used by VXLAN extensions if explicitly requested.
4354 */
4355 conf->reserved_bits = (struct vxlanhdr) {
4356 .vx_flags = ~used_bits.vx_flags,
4357 .vx_vni = ~used_bits.vx_vni,
4358 };
4359 }
4360
4361 if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL]) {
4362 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_NOPARTIAL,
4363 VXLAN_F_REMCSUM_NOPARTIAL, changelink,
4364 false, extack);
4365 if (err)
4366 return err;
4367 }
4368
4369 if (tb[IFLA_MTU]) {
4370 if (changelink) {
4371 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU],
4372 "Cannot change mtu");
4373 return -EOPNOTSUPP;
4374 }
4375 conf->mtu = nla_get_u32(tb[IFLA_MTU]);
4376 }
4377
4378 if (data[IFLA_VXLAN_DF])
4379 conf->df = nla_get_u8(data[IFLA_VXLAN_DF]);
4380
4381 if (data[IFLA_VXLAN_VNIFILTER]) {
4382 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_VNIFILTER,
4383 VXLAN_F_VNIFILTER, changelink, false,
4384 extack);
4385 if (err)
4386 return err;
4387
4388 if ((conf->flags & VXLAN_F_VNIFILTER) &&
4389 !(conf->flags & VXLAN_F_COLLECT_METADATA)) {
4390 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_VNIFILTER],
4391 "vxlan vnifilter only valid in collect metadata mode");
4392 return -EINVAL;
4393 }
4394 }
4395
4396 return 0;
4397 }
4398
vxlan_newlink(struct net * src_net,struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)4399 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
4400 struct nlattr *tb[], struct nlattr *data[],
4401 struct netlink_ext_ack *extack)
4402 {
4403 struct vxlan_config conf;
4404 int err;
4405
4406 err = vxlan_nl2conf(tb, data, dev, &conf, false, extack);
4407 if (err)
4408 return err;
4409
4410 return __vxlan_dev_create(src_net, dev, &conf, extack);
4411 }
4412
vxlan_changelink(struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)4413 static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[],
4414 struct nlattr *data[],
4415 struct netlink_ext_ack *extack)
4416 {
4417 struct vxlan_dev *vxlan = netdev_priv(dev);
4418 struct net_device *lowerdev;
4419 struct vxlan_config conf;
4420 struct vxlan_rdst *dst;
4421 int err;
4422
4423 dst = &vxlan->default_dst;
4424 err = vxlan_nl2conf(tb, data, dev, &conf, true, extack);
4425 if (err)
4426 return err;
4427
4428 err = vxlan_config_validate(vxlan->net, &conf, &lowerdev,
4429 vxlan, extack);
4430 if (err)
4431 return err;
4432
4433 if (dst->remote_dev == lowerdev)
4434 lowerdev = NULL;
4435
4436 err = netdev_adjacent_change_prepare(dst->remote_dev, lowerdev, dev,
4437 extack);
4438 if (err)
4439 return err;
4440
4441 /* handle default dst entry */
4442 if (!vxlan_addr_equal(&conf.remote_ip, &dst->remote_ip)) {
4443 u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, conf.vni);
4444
4445 spin_lock_bh(&vxlan->hash_lock[hash_index]);
4446 if (!vxlan_addr_any(&conf.remote_ip)) {
4447 err = vxlan_fdb_update(vxlan, all_zeros_mac,
4448 &conf.remote_ip,
4449 NUD_REACHABLE | NUD_PERMANENT,
4450 NLM_F_APPEND | NLM_F_CREATE,
4451 vxlan->cfg.dst_port,
4452 conf.vni, conf.vni,
4453 conf.remote_ifindex,
4454 NTF_SELF, 0, true, extack);
4455 if (err) {
4456 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4457 netdev_adjacent_change_abort(dst->remote_dev,
4458 lowerdev, dev);
4459 return err;
4460 }
4461 }
4462 if (!vxlan_addr_any(&dst->remote_ip))
4463 __vxlan_fdb_delete(vxlan, all_zeros_mac,
4464 dst->remote_ip,
4465 vxlan->cfg.dst_port,
4466 dst->remote_vni,
4467 dst->remote_vni,
4468 dst->remote_ifindex,
4469 true);
4470 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4471
4472 /* If vni filtering device, also update fdb entries of
4473 * all vnis that were using default remote ip
4474 */
4475 if (vxlan->cfg.flags & VXLAN_F_VNIFILTER) {
4476 err = vxlan_vnilist_update_group(vxlan, &dst->remote_ip,
4477 &conf.remote_ip, extack);
4478 if (err) {
4479 netdev_adjacent_change_abort(dst->remote_dev,
4480 lowerdev, dev);
4481 return err;
4482 }
4483 }
4484 }
4485
4486 if (conf.age_interval != vxlan->cfg.age_interval)
4487 mod_timer(&vxlan->age_timer, jiffies);
4488
4489 netdev_adjacent_change_commit(dst->remote_dev, lowerdev, dev);
4490 if (lowerdev && lowerdev != dst->remote_dev)
4491 dst->remote_dev = lowerdev;
4492 vxlan_config_apply(dev, &conf, lowerdev, vxlan->net, true);
4493 return 0;
4494 }
4495
vxlan_dellink(struct net_device * dev,struct list_head * head)4496 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
4497 {
4498 struct vxlan_dev *vxlan = netdev_priv(dev);
4499 struct vxlan_fdb_flush_desc desc = {
4500 /* Default entry is deleted at vxlan_uninit. */
4501 .ignore_default_entry = true,
4502 };
4503
4504 vxlan_flush(vxlan, &desc);
4505
4506 list_del(&vxlan->next);
4507 unregister_netdevice_queue(dev, head);
4508 if (vxlan->default_dst.remote_dev)
4509 netdev_upper_dev_unlink(vxlan->default_dst.remote_dev, dev);
4510 }
4511
vxlan_get_size(const struct net_device * dev)4512 static size_t vxlan_get_size(const struct net_device *dev)
4513 {
4514 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
4515 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
4516 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
4517 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
4518 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
4519 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL_INHERIT */
4520 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
4521 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_DF */
4522 nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */
4523 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LABEL_POLICY */
4524 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
4525 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
4526 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
4527 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
4528 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
4529 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_COLLECT_METADATA */
4530 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
4531 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
4532 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
4533 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
4534 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
4535 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
4536 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
4537 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
4538 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LOCALBYPASS */
4539 /* IFLA_VXLAN_PORT_RANGE */
4540 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
4541 nla_total_size(0) + /* IFLA_VXLAN_GBP */
4542 nla_total_size(0) + /* IFLA_VXLAN_GPE */
4543 nla_total_size(0) + /* IFLA_VXLAN_REMCSUM_NOPARTIAL */
4544 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_VNIFILTER */
4545 /* IFLA_VXLAN_RESERVED_BITS */
4546 nla_total_size(sizeof(struct vxlanhdr)) +
4547 0;
4548 }
4549
vxlan_fill_info(struct sk_buff * skb,const struct net_device * dev)4550 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
4551 {
4552 const struct vxlan_dev *vxlan = netdev_priv(dev);
4553 const struct vxlan_rdst *dst = &vxlan->default_dst;
4554 struct ifla_vxlan_port_range ports = {
4555 .low = htons(vxlan->cfg.port_min),
4556 .high = htons(vxlan->cfg.port_max),
4557 };
4558
4559 if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni)))
4560 goto nla_put_failure;
4561
4562 if (!vxlan_addr_any(&dst->remote_ip)) {
4563 if (dst->remote_ip.sa.sa_family == AF_INET) {
4564 if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
4565 dst->remote_ip.sin.sin_addr.s_addr))
4566 goto nla_put_failure;
4567 #if IS_ENABLED(CONFIG_IPV6)
4568 } else {
4569 if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
4570 &dst->remote_ip.sin6.sin6_addr))
4571 goto nla_put_failure;
4572 #endif
4573 }
4574 }
4575
4576 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
4577 goto nla_put_failure;
4578
4579 if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
4580 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
4581 if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
4582 vxlan->cfg.saddr.sin.sin_addr.s_addr))
4583 goto nla_put_failure;
4584 #if IS_ENABLED(CONFIG_IPV6)
4585 } else {
4586 if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
4587 &vxlan->cfg.saddr.sin6.sin6_addr))
4588 goto nla_put_failure;
4589 #endif
4590 }
4591 }
4592
4593 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
4594 nla_put_u8(skb, IFLA_VXLAN_TTL_INHERIT,
4595 !!(vxlan->cfg.flags & VXLAN_F_TTL_INHERIT)) ||
4596 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
4597 nla_put_u8(skb, IFLA_VXLAN_DF, vxlan->cfg.df) ||
4598 nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) ||
4599 nla_put_u32(skb, IFLA_VXLAN_LABEL_POLICY, vxlan->cfg.label_policy) ||
4600 nla_put_u8(skb, IFLA_VXLAN_LEARNING,
4601 !!(vxlan->cfg.flags & VXLAN_F_LEARN)) ||
4602 nla_put_u8(skb, IFLA_VXLAN_PROXY,
4603 !!(vxlan->cfg.flags & VXLAN_F_PROXY)) ||
4604 nla_put_u8(skb, IFLA_VXLAN_RSC,
4605 !!(vxlan->cfg.flags & VXLAN_F_RSC)) ||
4606 nla_put_u8(skb, IFLA_VXLAN_L2MISS,
4607 !!(vxlan->cfg.flags & VXLAN_F_L2MISS)) ||
4608 nla_put_u8(skb, IFLA_VXLAN_L3MISS,
4609 !!(vxlan->cfg.flags & VXLAN_F_L3MISS)) ||
4610 nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
4611 !!(vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)) ||
4612 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
4613 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
4614 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
4615 nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
4616 !(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
4617 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
4618 !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
4619 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
4620 !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
4621 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
4622 !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_TX)) ||
4623 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
4624 !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_RX)) ||
4625 nla_put_u8(skb, IFLA_VXLAN_LOCALBYPASS,
4626 !!(vxlan->cfg.flags & VXLAN_F_LOCALBYPASS)))
4627 goto nla_put_failure;
4628
4629 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
4630 goto nla_put_failure;
4631
4632 if (vxlan->cfg.flags & VXLAN_F_GBP &&
4633 nla_put_flag(skb, IFLA_VXLAN_GBP))
4634 goto nla_put_failure;
4635
4636 if (vxlan->cfg.flags & VXLAN_F_GPE &&
4637 nla_put_flag(skb, IFLA_VXLAN_GPE))
4638 goto nla_put_failure;
4639
4640 if (vxlan->cfg.flags & VXLAN_F_REMCSUM_NOPARTIAL &&
4641 nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
4642 goto nla_put_failure;
4643
4644 if (vxlan->cfg.flags & VXLAN_F_VNIFILTER &&
4645 nla_put_u8(skb, IFLA_VXLAN_VNIFILTER,
4646 !!(vxlan->cfg.flags & VXLAN_F_VNIFILTER)))
4647 goto nla_put_failure;
4648
4649 if (nla_put(skb, IFLA_VXLAN_RESERVED_BITS,
4650 sizeof(vxlan->cfg.reserved_bits),
4651 &vxlan->cfg.reserved_bits))
4652 goto nla_put_failure;
4653
4654 return 0;
4655
4656 nla_put_failure:
4657 return -EMSGSIZE;
4658 }
4659
vxlan_get_link_net(const struct net_device * dev)4660 static struct net *vxlan_get_link_net(const struct net_device *dev)
4661 {
4662 struct vxlan_dev *vxlan = netdev_priv(dev);
4663
4664 return READ_ONCE(vxlan->net);
4665 }
4666
4667 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
4668 .kind = "vxlan",
4669 .maxtype = IFLA_VXLAN_MAX,
4670 .policy = vxlan_policy,
4671 .priv_size = sizeof(struct vxlan_dev),
4672 .setup = vxlan_setup,
4673 .validate = vxlan_validate,
4674 .newlink = vxlan_newlink,
4675 .changelink = vxlan_changelink,
4676 .dellink = vxlan_dellink,
4677 .get_size = vxlan_get_size,
4678 .fill_info = vxlan_fill_info,
4679 .get_link_net = vxlan_get_link_net,
4680 };
4681
vxlan_dev_create(struct net * net,const char * name,u8 name_assign_type,struct vxlan_config * conf)4682 struct net_device *vxlan_dev_create(struct net *net, const char *name,
4683 u8 name_assign_type,
4684 struct vxlan_config *conf)
4685 {
4686 struct nlattr *tb[IFLA_MAX + 1];
4687 struct net_device *dev;
4688 int err;
4689
4690 memset(&tb, 0, sizeof(tb));
4691
4692 dev = rtnl_create_link(net, name, name_assign_type,
4693 &vxlan_link_ops, tb, NULL);
4694 if (IS_ERR(dev))
4695 return dev;
4696
4697 err = __vxlan_dev_create(net, dev, conf, NULL);
4698 if (err < 0) {
4699 free_netdev(dev);
4700 return ERR_PTR(err);
4701 }
4702
4703 err = rtnl_configure_link(dev, NULL, 0, NULL);
4704 if (err < 0) {
4705 LIST_HEAD(list_kill);
4706
4707 vxlan_dellink(dev, &list_kill);
4708 unregister_netdevice_many(&list_kill);
4709 return ERR_PTR(err);
4710 }
4711
4712 return dev;
4713 }
4714 EXPORT_SYMBOL_GPL(vxlan_dev_create);
4715
vxlan_handle_lowerdev_unregister(struct vxlan_net * vn,struct net_device * dev)4716 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
4717 struct net_device *dev)
4718 {
4719 struct vxlan_dev *vxlan, *next;
4720 LIST_HEAD(list_kill);
4721
4722 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
4723 struct vxlan_rdst *dst = &vxlan->default_dst;
4724
4725 /* In case we created vxlan device with carrier
4726 * and we loose the carrier due to module unload
4727 * we also need to remove vxlan device. In other
4728 * cases, it's not necessary and remote_ifindex
4729 * is 0 here, so no matches.
4730 */
4731 if (dst->remote_ifindex == dev->ifindex)
4732 vxlan_dellink(vxlan->dev, &list_kill);
4733 }
4734
4735 unregister_netdevice_many(&list_kill);
4736 }
4737
vxlan_netdevice_event(struct notifier_block * unused,unsigned long event,void * ptr)4738 static int vxlan_netdevice_event(struct notifier_block *unused,
4739 unsigned long event, void *ptr)
4740 {
4741 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4742 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
4743
4744 if (event == NETDEV_UNREGISTER)
4745 vxlan_handle_lowerdev_unregister(vn, dev);
4746 else if (event == NETDEV_UDP_TUNNEL_PUSH_INFO)
4747 vxlan_offload_rx_ports(dev, true);
4748 else if (event == NETDEV_UDP_TUNNEL_DROP_INFO)
4749 vxlan_offload_rx_ports(dev, false);
4750
4751 return NOTIFY_DONE;
4752 }
4753
4754 static struct notifier_block vxlan_notifier_block __read_mostly = {
4755 .notifier_call = vxlan_netdevice_event,
4756 };
4757
4758 static void
vxlan_fdb_offloaded_set(struct net_device * dev,struct switchdev_notifier_vxlan_fdb_info * fdb_info)4759 vxlan_fdb_offloaded_set(struct net_device *dev,
4760 struct switchdev_notifier_vxlan_fdb_info *fdb_info)
4761 {
4762 struct vxlan_dev *vxlan = netdev_priv(dev);
4763 struct vxlan_rdst *rdst;
4764 struct vxlan_fdb *f;
4765 u32 hash_index;
4766
4767 hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
4768
4769 spin_lock_bh(&vxlan->hash_lock[hash_index]);
4770
4771 f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni);
4772 if (!f)
4773 goto out;
4774
4775 rdst = vxlan_fdb_find_rdst(f, &fdb_info->remote_ip,
4776 fdb_info->remote_port,
4777 fdb_info->remote_vni,
4778 fdb_info->remote_ifindex);
4779 if (!rdst)
4780 goto out;
4781
4782 rdst->offloaded = fdb_info->offloaded;
4783
4784 out:
4785 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4786 }
4787
4788 static int
vxlan_fdb_external_learn_add(struct net_device * dev,struct switchdev_notifier_vxlan_fdb_info * fdb_info)4789 vxlan_fdb_external_learn_add(struct net_device *dev,
4790 struct switchdev_notifier_vxlan_fdb_info *fdb_info)
4791 {
4792 struct vxlan_dev *vxlan = netdev_priv(dev);
4793 struct netlink_ext_ack *extack;
4794 u32 hash_index;
4795 int err;
4796
4797 hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
4798 extack = switchdev_notifier_info_to_extack(&fdb_info->info);
4799
4800 spin_lock_bh(&vxlan->hash_lock[hash_index]);
4801 err = vxlan_fdb_update(vxlan, fdb_info->eth_addr, &fdb_info->remote_ip,
4802 NUD_REACHABLE,
4803 NLM_F_CREATE | NLM_F_REPLACE,
4804 fdb_info->remote_port,
4805 fdb_info->vni,
4806 fdb_info->remote_vni,
4807 fdb_info->remote_ifindex,
4808 NTF_USE | NTF_SELF | NTF_EXT_LEARNED,
4809 0, false, extack);
4810 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4811
4812 return err;
4813 }
4814
4815 static int
vxlan_fdb_external_learn_del(struct net_device * dev,struct switchdev_notifier_vxlan_fdb_info * fdb_info)4816 vxlan_fdb_external_learn_del(struct net_device *dev,
4817 struct switchdev_notifier_vxlan_fdb_info *fdb_info)
4818 {
4819 struct vxlan_dev *vxlan = netdev_priv(dev);
4820 struct vxlan_fdb *f;
4821 u32 hash_index;
4822 int err = 0;
4823
4824 hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
4825 spin_lock_bh(&vxlan->hash_lock[hash_index]);
4826
4827 f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni);
4828 if (!f)
4829 err = -ENOENT;
4830 else if (f->flags & NTF_EXT_LEARNED)
4831 err = __vxlan_fdb_delete(vxlan, fdb_info->eth_addr,
4832 fdb_info->remote_ip,
4833 fdb_info->remote_port,
4834 fdb_info->vni,
4835 fdb_info->remote_vni,
4836 fdb_info->remote_ifindex,
4837 false);
4838
4839 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4840
4841 return err;
4842 }
4843
vxlan_switchdev_event(struct notifier_block * unused,unsigned long event,void * ptr)4844 static int vxlan_switchdev_event(struct notifier_block *unused,
4845 unsigned long event, void *ptr)
4846 {
4847 struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
4848 struct switchdev_notifier_vxlan_fdb_info *fdb_info;
4849 int err = 0;
4850
4851 switch (event) {
4852 case SWITCHDEV_VXLAN_FDB_OFFLOADED:
4853 vxlan_fdb_offloaded_set(dev, ptr);
4854 break;
4855 case SWITCHDEV_VXLAN_FDB_ADD_TO_BRIDGE:
4856 fdb_info = ptr;
4857 err = vxlan_fdb_external_learn_add(dev, fdb_info);
4858 if (err) {
4859 err = notifier_from_errno(err);
4860 break;
4861 }
4862 fdb_info->offloaded = true;
4863 vxlan_fdb_offloaded_set(dev, fdb_info);
4864 break;
4865 case SWITCHDEV_VXLAN_FDB_DEL_TO_BRIDGE:
4866 fdb_info = ptr;
4867 err = vxlan_fdb_external_learn_del(dev, fdb_info);
4868 if (err) {
4869 err = notifier_from_errno(err);
4870 break;
4871 }
4872 fdb_info->offloaded = false;
4873 vxlan_fdb_offloaded_set(dev, fdb_info);
4874 break;
4875 }
4876
4877 return err;
4878 }
4879
4880 static struct notifier_block vxlan_switchdev_notifier_block __read_mostly = {
4881 .notifier_call = vxlan_switchdev_event,
4882 };
4883
vxlan_fdb_nh_flush(struct nexthop * nh)4884 static void vxlan_fdb_nh_flush(struct nexthop *nh)
4885 {
4886 struct vxlan_fdb *fdb;
4887 struct vxlan_dev *vxlan;
4888 u32 hash_index;
4889
4890 rcu_read_lock();
4891 list_for_each_entry_rcu(fdb, &nh->fdb_list, nh_list) {
4892 vxlan = rcu_dereference(fdb->vdev);
4893 WARN_ON(!vxlan);
4894 hash_index = fdb_head_index(vxlan, fdb->eth_addr,
4895 vxlan->default_dst.remote_vni);
4896 spin_lock_bh(&vxlan->hash_lock[hash_index]);
4897 if (!hlist_unhashed(&fdb->hlist))
4898 vxlan_fdb_destroy(vxlan, fdb, false, false);
4899 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4900 }
4901 rcu_read_unlock();
4902 }
4903
vxlan_nexthop_event(struct notifier_block * nb,unsigned long event,void * ptr)4904 static int vxlan_nexthop_event(struct notifier_block *nb,
4905 unsigned long event, void *ptr)
4906 {
4907 struct nh_notifier_info *info = ptr;
4908 struct nexthop *nh;
4909
4910 if (event != NEXTHOP_EVENT_DEL)
4911 return NOTIFY_DONE;
4912
4913 nh = nexthop_find_by_id(info->net, info->id);
4914 if (!nh)
4915 return NOTIFY_DONE;
4916
4917 vxlan_fdb_nh_flush(nh);
4918
4919 return NOTIFY_DONE;
4920 }
4921
vxlan_init_net(struct net * net)4922 static __net_init int vxlan_init_net(struct net *net)
4923 {
4924 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
4925 unsigned int h;
4926
4927 INIT_LIST_HEAD(&vn->vxlan_list);
4928 spin_lock_init(&vn->sock_lock);
4929 vn->nexthop_notifier_block.notifier_call = vxlan_nexthop_event;
4930
4931 for (h = 0; h < PORT_HASH_SIZE; ++h)
4932 INIT_HLIST_HEAD(&vn->sock_list[h]);
4933
4934 return register_nexthop_notifier(net, &vn->nexthop_notifier_block,
4935 NULL);
4936 }
4937
vxlan_destroy_tunnels(struct vxlan_net * vn,struct list_head * dev_to_kill)4938 static void __net_exit vxlan_destroy_tunnels(struct vxlan_net *vn,
4939 struct list_head *dev_to_kill)
4940 {
4941 struct vxlan_dev *vxlan, *next;
4942
4943 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next)
4944 vxlan_dellink(vxlan->dev, dev_to_kill);
4945 }
4946
vxlan_exit_batch_rtnl(struct list_head * net_list,struct list_head * dev_to_kill)4947 static void __net_exit vxlan_exit_batch_rtnl(struct list_head *net_list,
4948 struct list_head *dev_to_kill)
4949 {
4950 struct net *net;
4951
4952 ASSERT_RTNL();
4953 list_for_each_entry(net, net_list, exit_list) {
4954 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
4955
4956 __unregister_nexthop_notifier(net, &vn->nexthop_notifier_block);
4957
4958 vxlan_destroy_tunnels(vn, dev_to_kill);
4959 }
4960 }
4961
vxlan_exit_net(struct net * net)4962 static void __net_exit vxlan_exit_net(struct net *net)
4963 {
4964 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
4965 unsigned int h;
4966
4967 for (h = 0; h < PORT_HASH_SIZE; ++h)
4968 WARN_ON_ONCE(!hlist_empty(&vn->sock_list[h]));
4969 }
4970
4971 static struct pernet_operations vxlan_net_ops = {
4972 .init = vxlan_init_net,
4973 .exit_batch_rtnl = vxlan_exit_batch_rtnl,
4974 .exit = vxlan_exit_net,
4975 .id = &vxlan_net_id,
4976 .size = sizeof(struct vxlan_net),
4977 };
4978
vxlan_init_module(void)4979 static int __init vxlan_init_module(void)
4980 {
4981 int rc;
4982
4983 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
4984
4985 rc = register_pernet_subsys(&vxlan_net_ops);
4986 if (rc)
4987 goto out1;
4988
4989 rc = register_netdevice_notifier(&vxlan_notifier_block);
4990 if (rc)
4991 goto out2;
4992
4993 rc = register_switchdev_notifier(&vxlan_switchdev_notifier_block);
4994 if (rc)
4995 goto out3;
4996
4997 rc = rtnl_link_register(&vxlan_link_ops);
4998 if (rc)
4999 goto out4;
5000
5001 rc = vxlan_vnifilter_init();
5002 if (rc)
5003 goto out5;
5004
5005 return 0;
5006 out5:
5007 rtnl_link_unregister(&vxlan_link_ops);
5008 out4:
5009 unregister_switchdev_notifier(&vxlan_switchdev_notifier_block);
5010 out3:
5011 unregister_netdevice_notifier(&vxlan_notifier_block);
5012 out2:
5013 unregister_pernet_subsys(&vxlan_net_ops);
5014 out1:
5015 return rc;
5016 }
5017 late_initcall(vxlan_init_module);
5018
vxlan_cleanup_module(void)5019 static void __exit vxlan_cleanup_module(void)
5020 {
5021 vxlan_vnifilter_uninit();
5022 rtnl_link_unregister(&vxlan_link_ops);
5023 unregister_switchdev_notifier(&vxlan_switchdev_notifier_block);
5024 unregister_netdevice_notifier(&vxlan_notifier_block);
5025 unregister_pernet_subsys(&vxlan_net_ops);
5026 /* rcu_barrier() is called by netns */
5027 }
5028 module_exit(vxlan_cleanup_module);
5029
5030 MODULE_LICENSE("GPL");
5031 MODULE_VERSION(VXLAN_VERSION);
5032 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
5033 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
5034 MODULE_ALIAS_RTNL_LINK("vxlan");
5035