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1 | // SPDX-License-Identifier: GPL-2.0-only | |
2 | /* | |
3 | * VXLAN: Virtual eXtensible Local Area Network | |
4 | * | |
5 | * Copyright (c) 2012-2013 Vyatta Inc. | |
6 | */ | |
7 | ||
8 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
9 | ||
10 | #include <linux/kernel.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/errno.h> | |
13 | #include <linux/slab.h> | |
14 | #include <linux/udp.h> | |
15 | #include <linux/igmp.h> | |
16 | #include <linux/if_ether.h> | |
17 | #include <linux/ethtool.h> | |
18 | #include <net/arp.h> | |
19 | #include <net/ndisc.h> | |
20 | #include <net/ipv6_stubs.h> | |
21 | #include <net/ip.h> | |
22 | #include <net/icmp.h> | |
23 | #include <net/rtnetlink.h> | |
24 | #include <net/inet_ecn.h> | |
25 | #include <net/net_namespace.h> | |
26 | #include <net/netns/generic.h> | |
27 | #include <net/tun_proto.h> | |
28 | #include <net/vxlan.h> | |
29 | ||
30 | #if IS_ENABLED(CONFIG_IPV6) | |
31 | #include <net/ip6_tunnel.h> | |
32 | #include <net/ip6_checksum.h> | |
33 | #endif | |
34 | ||
35 | #define VXLAN_VERSION "0.1" | |
36 | ||
37 | #define PORT_HASH_BITS 8 | |
38 | #define PORT_HASH_SIZE (1<<PORT_HASH_BITS) | |
39 | #define FDB_AGE_DEFAULT 300 /* 5 min */ | |
40 | #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */ | |
41 | ||
42 | /* UDP port for VXLAN traffic. | |
43 | * The IANA assigned port is 4789, but the Linux default is 8472 | |
44 | * for compatibility with early adopters. | |
45 | */ | |
46 | static unsigned short vxlan_port __read_mostly = 8472; | |
47 | module_param_named(udp_port, vxlan_port, ushort, 0444); | |
48 | MODULE_PARM_DESC(udp_port, "Destination UDP port"); | |
49 | ||
50 | static bool log_ecn_error = true; | |
51 | module_param(log_ecn_error, bool, 0644); | |
52 | MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); | |
53 | ||
54 | static unsigned int vxlan_net_id; | |
55 | static struct rtnl_link_ops vxlan_link_ops; | |
56 | ||
57 | static const u8 all_zeros_mac[ETH_ALEN + 2]; | |
58 | ||
59 | static int vxlan_sock_add(struct vxlan_dev *vxlan); | |
60 | ||
61 | static void vxlan_vs_del_dev(struct vxlan_dev *vxlan); | |
62 | ||
63 | /* per-network namespace private data for this module */ | |
64 | struct vxlan_net { | |
65 | struct list_head vxlan_list; | |
66 | struct hlist_head sock_list[PORT_HASH_SIZE]; | |
67 | spinlock_t sock_lock; | |
68 | }; | |
69 | ||
70 | /* Forwarding table entry */ | |
71 | struct vxlan_fdb { | |
72 | struct hlist_node hlist; /* linked list of entries */ | |
73 | struct rcu_head rcu; | |
74 | unsigned long updated; /* jiffies */ | |
75 | unsigned long used; | |
76 | struct list_head remotes; | |
77 | u8 eth_addr[ETH_ALEN]; | |
78 | u16 state; /* see ndm_state */ | |
79 | __be32 vni; | |
80 | u16 flags; /* see ndm_flags and below */ | |
81 | }; | |
82 | ||
83 | #define NTF_VXLAN_ADDED_BY_USER 0x100 | |
84 | ||
85 | /* salt for hash table */ | |
86 | static u32 vxlan_salt __read_mostly; | |
87 | ||
88 | static inline bool vxlan_collect_metadata(struct vxlan_sock *vs) | |
89 | { | |
90 | return vs->flags & VXLAN_F_COLLECT_METADATA || | |
91 | ip_tunnel_collect_metadata(); | |
92 | } | |
93 | ||
94 | #if IS_ENABLED(CONFIG_IPV6) | |
95 | static inline | |
96 | bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b) | |
97 | { | |
98 | if (a->sa.sa_family != b->sa.sa_family) | |
99 | return false; | |
100 | if (a->sa.sa_family == AF_INET6) | |
101 | return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr); | |
102 | else | |
103 | return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr; | |
104 | } | |
105 | ||
106 | static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla) | |
107 | { | |
108 | if (nla_len(nla) >= sizeof(struct in6_addr)) { | |
109 | ip->sin6.sin6_addr = nla_get_in6_addr(nla); | |
110 | ip->sa.sa_family = AF_INET6; | |
111 | return 0; | |
112 | } else if (nla_len(nla) >= sizeof(__be32)) { | |
113 | ip->sin.sin_addr.s_addr = nla_get_in_addr(nla); | |
114 | ip->sa.sa_family = AF_INET; | |
115 | return 0; | |
116 | } else { | |
117 | return -EAFNOSUPPORT; | |
118 | } | |
119 | } | |
120 | ||
121 | static int vxlan_nla_put_addr(struct sk_buff *skb, int attr, | |
122 | const union vxlan_addr *ip) | |
123 | { | |
124 | if (ip->sa.sa_family == AF_INET6) | |
125 | return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr); | |
126 | else | |
127 | return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr); | |
128 | } | |
129 | ||
130 | #else /* !CONFIG_IPV6 */ | |
131 | ||
132 | static inline | |
133 | bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b) | |
134 | { | |
135 | return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr; | |
136 | } | |
137 | ||
138 | static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla) | |
139 | { | |
140 | if (nla_len(nla) >= sizeof(struct in6_addr)) { | |
141 | return -EAFNOSUPPORT; | |
142 | } else if (nla_len(nla) >= sizeof(__be32)) { | |
143 | ip->sin.sin_addr.s_addr = nla_get_in_addr(nla); | |
144 | ip->sa.sa_family = AF_INET; | |
145 | return 0; | |
146 | } else { | |
147 | return -EAFNOSUPPORT; | |
148 | } | |
149 | } | |
150 | ||
151 | static int vxlan_nla_put_addr(struct sk_buff *skb, int attr, | |
152 | const union vxlan_addr *ip) | |
153 | { | |
154 | return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr); | |
155 | } | |
156 | #endif | |
157 | ||
158 | /* Virtual Network hash table head */ | |
159 | static inline struct hlist_head *vni_head(struct vxlan_sock *vs, __be32 vni) | |
160 | { | |
161 | return &vs->vni_list[hash_32((__force u32)vni, VNI_HASH_BITS)]; | |
162 | } | |
163 | ||
164 | /* Socket hash table head */ | |
165 | static inline struct hlist_head *vs_head(struct net *net, __be16 port) | |
166 | { | |
167 | struct vxlan_net *vn = net_generic(net, vxlan_net_id); | |
168 | ||
169 | return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)]; | |
170 | } | |
171 | ||
172 | /* First remote destination for a forwarding entry. | |
173 | * Guaranteed to be non-NULL because remotes are never deleted. | |
174 | */ | |
175 | static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb) | |
176 | { | |
177 | return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list); | |
178 | } | |
179 | ||
180 | static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb) | |
181 | { | |
182 | return list_first_entry(&fdb->remotes, struct vxlan_rdst, list); | |
183 | } | |
184 | ||
185 | /* Find VXLAN socket based on network namespace, address family and UDP port | |
186 | * and enabled unshareable flags. | |
187 | */ | |
188 | static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family, | |
189 | __be16 port, u32 flags, int ifindex) | |
190 | { | |
191 | struct vxlan_sock *vs; | |
192 | ||
193 | flags &= VXLAN_F_RCV_FLAGS; | |
194 | ||
195 | hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) { | |
196 | if (inet_sk(vs->sock->sk)->inet_sport == port && | |
197 | vxlan_get_sk_family(vs) == family && | |
198 | vs->flags == flags && | |
199 | vs->sock->sk->sk_bound_dev_if == ifindex) | |
200 | return vs; | |
201 | } | |
202 | return NULL; | |
203 | } | |
204 | ||
205 | static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, int ifindex, | |
206 | __be32 vni) | |
207 | { | |
208 | struct vxlan_dev_node *node; | |
209 | ||
210 | /* For flow based devices, map all packets to VNI 0 */ | |
211 | if (vs->flags & VXLAN_F_COLLECT_METADATA) | |
212 | vni = 0; | |
213 | ||
214 | hlist_for_each_entry_rcu(node, vni_head(vs, vni), hlist) { | |
215 | if (node->vxlan->default_dst.remote_vni != vni) | |
216 | continue; | |
217 | ||
218 | if (IS_ENABLED(CONFIG_IPV6)) { | |
219 | const struct vxlan_config *cfg = &node->vxlan->cfg; | |
220 | ||
221 | if ((cfg->flags & VXLAN_F_IPV6_LINKLOCAL) && | |
222 | cfg->remote_ifindex != ifindex) | |
223 | continue; | |
224 | } | |
225 | ||
226 | return node->vxlan; | |
227 | } | |
228 | ||
229 | return NULL; | |
230 | } | |
231 | ||
232 | /* Look up VNI in a per net namespace table */ | |
233 | static struct vxlan_dev *vxlan_find_vni(struct net *net, int ifindex, | |
234 | __be32 vni, sa_family_t family, | |
235 | __be16 port, u32 flags) | |
236 | { | |
237 | struct vxlan_sock *vs; | |
238 | ||
239 | vs = vxlan_find_sock(net, family, port, flags, ifindex); | |
240 | if (!vs) | |
241 | return NULL; | |
242 | ||
243 | return vxlan_vs_find_vni(vs, ifindex, vni); | |
244 | } | |
245 | ||
246 | /* Fill in neighbour message in skbuff. */ | |
247 | static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan, | |
248 | const struct vxlan_fdb *fdb, | |
249 | u32 portid, u32 seq, int type, unsigned int flags, | |
250 | const struct vxlan_rdst *rdst) | |
251 | { | |
252 | unsigned long now = jiffies; | |
253 | struct nda_cacheinfo ci; | |
254 | struct nlmsghdr *nlh; | |
255 | struct ndmsg *ndm; | |
256 | bool send_ip, send_eth; | |
257 | ||
258 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags); | |
259 | if (nlh == NULL) | |
260 | return -EMSGSIZE; | |
261 | ||
262 | ndm = nlmsg_data(nlh); | |
263 | memset(ndm, 0, sizeof(*ndm)); | |
264 | ||
265 | send_eth = send_ip = true; | |
266 | ||
267 | if (type == RTM_GETNEIGH) { | |
268 | send_ip = !vxlan_addr_any(&rdst->remote_ip); | |
269 | send_eth = !is_zero_ether_addr(fdb->eth_addr); | |
270 | ndm->ndm_family = send_ip ? rdst->remote_ip.sa.sa_family : AF_INET; | |
271 | } else | |
272 | ndm->ndm_family = AF_BRIDGE; | |
273 | ndm->ndm_state = fdb->state; | |
274 | ndm->ndm_ifindex = vxlan->dev->ifindex; | |
275 | ndm->ndm_flags = fdb->flags; | |
276 | if (rdst->offloaded) | |
277 | ndm->ndm_flags |= NTF_OFFLOADED; | |
278 | ndm->ndm_type = RTN_UNICAST; | |
279 | ||
280 | if (!net_eq(dev_net(vxlan->dev), vxlan->net) && | |
281 | nla_put_s32(skb, NDA_LINK_NETNSID, | |
282 | peernet2id(dev_net(vxlan->dev), vxlan->net))) | |
283 | goto nla_put_failure; | |
284 | ||
285 | if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr)) | |
286 | goto nla_put_failure; | |
287 | ||
288 | if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip)) | |
289 | goto nla_put_failure; | |
290 | ||
291 | if (rdst->remote_port && rdst->remote_port != vxlan->cfg.dst_port && | |
292 | nla_put_be16(skb, NDA_PORT, rdst->remote_port)) | |
293 | goto nla_put_failure; | |
294 | if (rdst->remote_vni != vxlan->default_dst.remote_vni && | |
295 | nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni))) | |
296 | goto nla_put_failure; | |
297 | if ((vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) && fdb->vni && | |
298 | nla_put_u32(skb, NDA_SRC_VNI, | |
299 | be32_to_cpu(fdb->vni))) | |
300 | goto nla_put_failure; | |
301 | if (rdst->remote_ifindex && | |
302 | nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex)) | |
303 | goto nla_put_failure; | |
304 | ||
305 | ci.ndm_used = jiffies_to_clock_t(now - fdb->used); | |
306 | ci.ndm_confirmed = 0; | |
307 | ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated); | |
308 | ci.ndm_refcnt = 0; | |
309 | ||
310 | if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci)) | |
311 | goto nla_put_failure; | |
312 | ||
313 | nlmsg_end(skb, nlh); | |
314 | return 0; | |
315 | ||
316 | nla_put_failure: | |
317 | nlmsg_cancel(skb, nlh); | |
318 | return -EMSGSIZE; | |
319 | } | |
320 | ||
321 | static inline size_t vxlan_nlmsg_size(void) | |
322 | { | |
323 | return NLMSG_ALIGN(sizeof(struct ndmsg)) | |
324 | + nla_total_size(ETH_ALEN) /* NDA_LLADDR */ | |
325 | + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */ | |
326 | + nla_total_size(sizeof(__be16)) /* NDA_PORT */ | |
327 | + nla_total_size(sizeof(__be32)) /* NDA_VNI */ | |
328 | + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */ | |
329 | + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */ | |
330 | + nla_total_size(sizeof(struct nda_cacheinfo)); | |
331 | } | |
332 | ||
333 | static void __vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb, | |
334 | struct vxlan_rdst *rd, int type) | |
335 | { | |
336 | struct net *net = dev_net(vxlan->dev); | |
337 | struct sk_buff *skb; | |
338 | int err = -ENOBUFS; | |
339 | ||
340 | skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC); | |
341 | if (skb == NULL) | |
342 | goto errout; | |
343 | ||
344 | err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd); | |
345 | if (err < 0) { | |
346 | /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */ | |
347 | WARN_ON(err == -EMSGSIZE); | |
348 | kfree_skb(skb); | |
349 | goto errout; | |
350 | } | |
351 | ||
352 | rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); | |
353 | return; | |
354 | errout: | |
355 | if (err < 0) | |
356 | rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); | |
357 | } | |
358 | ||
359 | static void vxlan_fdb_switchdev_notifier_info(const struct vxlan_dev *vxlan, | |
360 | const struct vxlan_fdb *fdb, | |
361 | const struct vxlan_rdst *rd, | |
362 | struct netlink_ext_ack *extack, | |
363 | struct switchdev_notifier_vxlan_fdb_info *fdb_info) | |
364 | { | |
365 | fdb_info->info.dev = vxlan->dev; | |
366 | fdb_info->info.extack = extack; | |
367 | fdb_info->remote_ip = rd->remote_ip; | |
368 | fdb_info->remote_port = rd->remote_port; | |
369 | fdb_info->remote_vni = rd->remote_vni; | |
370 | fdb_info->remote_ifindex = rd->remote_ifindex; | |
371 | memcpy(fdb_info->eth_addr, fdb->eth_addr, ETH_ALEN); | |
372 | fdb_info->vni = fdb->vni; | |
373 | fdb_info->offloaded = rd->offloaded; | |
374 | fdb_info->added_by_user = fdb->flags & NTF_VXLAN_ADDED_BY_USER; | |
375 | } | |
376 | ||
377 | static int vxlan_fdb_switchdev_call_notifiers(struct vxlan_dev *vxlan, | |
378 | struct vxlan_fdb *fdb, | |
379 | struct vxlan_rdst *rd, | |
380 | bool adding, | |
381 | struct netlink_ext_ack *extack) | |
382 | { | |
383 | struct switchdev_notifier_vxlan_fdb_info info; | |
384 | enum switchdev_notifier_type notifier_type; | |
385 | int ret; | |
386 | ||
387 | if (WARN_ON(!rd)) | |
388 | return 0; | |
389 | ||
390 | notifier_type = adding ? SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE | |
391 | : SWITCHDEV_VXLAN_FDB_DEL_TO_DEVICE; | |
392 | vxlan_fdb_switchdev_notifier_info(vxlan, fdb, rd, NULL, &info); | |
393 | ret = call_switchdev_notifiers(notifier_type, vxlan->dev, | |
394 | &info.info, extack); | |
395 | return notifier_to_errno(ret); | |
396 | } | |
397 | ||
398 | static int vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb, | |
399 | struct vxlan_rdst *rd, int type, bool swdev_notify, | |
400 | struct netlink_ext_ack *extack) | |
401 | { | |
402 | int err; | |
403 | ||
404 | if (swdev_notify) { | |
405 | switch (type) { | |
406 | case RTM_NEWNEIGH: | |
407 | err = vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd, | |
408 | true, extack); | |
409 | if (err) | |
410 | return err; | |
411 | break; | |
412 | case RTM_DELNEIGH: | |
413 | vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd, | |
414 | false, extack); | |
415 | break; | |
416 | } | |
417 | } | |
418 | ||
419 | __vxlan_fdb_notify(vxlan, fdb, rd, type); | |
420 | return 0; | |
421 | } | |
422 | ||
423 | static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa) | |
424 | { | |
425 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
426 | struct vxlan_fdb f = { | |
427 | .state = NUD_STALE, | |
428 | }; | |
429 | struct vxlan_rdst remote = { | |
430 | .remote_ip = *ipa, /* goes to NDA_DST */ | |
431 | .remote_vni = cpu_to_be32(VXLAN_N_VID), | |
432 | }; | |
433 | ||
434 | vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL); | |
435 | } | |
436 | ||
437 | static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN]) | |
438 | { | |
439 | struct vxlan_fdb f = { | |
440 | .state = NUD_STALE, | |
441 | }; | |
442 | struct vxlan_rdst remote = { }; | |
443 | ||
444 | memcpy(f.eth_addr, eth_addr, ETH_ALEN); | |
445 | ||
446 | vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL); | |
447 | } | |
448 | ||
449 | /* Hash Ethernet address */ | |
450 | static u32 eth_hash(const unsigned char *addr) | |
451 | { | |
452 | u64 value = get_unaligned((u64 *)addr); | |
453 | ||
454 | /* only want 6 bytes */ | |
455 | #ifdef __BIG_ENDIAN | |
456 | value >>= 16; | |
457 | #else | |
458 | value <<= 16; | |
459 | #endif | |
460 | return hash_64(value, FDB_HASH_BITS); | |
461 | } | |
462 | ||
463 | static u32 eth_vni_hash(const unsigned char *addr, __be32 vni) | |
464 | { | |
465 | /* use 1 byte of OUI and 3 bytes of NIC */ | |
466 | u32 key = get_unaligned((u32 *)(addr + 2)); | |
467 | ||
468 | return jhash_2words(key, vni, vxlan_salt) & (FDB_HASH_SIZE - 1); | |
469 | } | |
470 | ||
471 | static u32 fdb_head_index(struct vxlan_dev *vxlan, const u8 *mac, __be32 vni) | |
472 | { | |
473 | if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) | |
474 | return eth_vni_hash(mac, vni); | |
475 | else | |
476 | return eth_hash(mac); | |
477 | } | |
478 | ||
479 | /* Hash chain to use given mac address */ | |
480 | static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan, | |
481 | const u8 *mac, __be32 vni) | |
482 | { | |
483 | return &vxlan->fdb_head[fdb_head_index(vxlan, mac, vni)]; | |
484 | } | |
485 | ||
486 | /* Look up Ethernet address in forwarding table */ | |
487 | static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan, | |
488 | const u8 *mac, __be32 vni) | |
489 | { | |
490 | struct hlist_head *head = vxlan_fdb_head(vxlan, mac, vni); | |
491 | struct vxlan_fdb *f; | |
492 | ||
493 | hlist_for_each_entry_rcu(f, head, hlist) { | |
494 | if (ether_addr_equal(mac, f->eth_addr)) { | |
495 | if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) { | |
496 | if (vni == f->vni) | |
497 | return f; | |
498 | } else { | |
499 | return f; | |
500 | } | |
501 | } | |
502 | } | |
503 | ||
504 | return NULL; | |
505 | } | |
506 | ||
507 | static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan, | |
508 | const u8 *mac, __be32 vni) | |
509 | { | |
510 | struct vxlan_fdb *f; | |
511 | ||
512 | f = __vxlan_find_mac(vxlan, mac, vni); | |
513 | if (f && f->used != jiffies) | |
514 | f->used = jiffies; | |
515 | ||
516 | return f; | |
517 | } | |
518 | ||
519 | /* caller should hold vxlan->hash_lock */ | |
520 | static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f, | |
521 | union vxlan_addr *ip, __be16 port, | |
522 | __be32 vni, __u32 ifindex) | |
523 | { | |
524 | struct vxlan_rdst *rd; | |
525 | ||
526 | list_for_each_entry(rd, &f->remotes, list) { | |
527 | if (vxlan_addr_equal(&rd->remote_ip, ip) && | |
528 | rd->remote_port == port && | |
529 | rd->remote_vni == vni && | |
530 | rd->remote_ifindex == ifindex) | |
531 | return rd; | |
532 | } | |
533 | ||
534 | return NULL; | |
535 | } | |
536 | ||
537 | int vxlan_fdb_find_uc(struct net_device *dev, const u8 *mac, __be32 vni, | |
538 | struct switchdev_notifier_vxlan_fdb_info *fdb_info) | |
539 | { | |
540 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
541 | u8 eth_addr[ETH_ALEN + 2] = { 0 }; | |
542 | struct vxlan_rdst *rdst; | |
543 | struct vxlan_fdb *f; | |
544 | int rc = 0; | |
545 | ||
546 | if (is_multicast_ether_addr(mac) || | |
547 | is_zero_ether_addr(mac)) | |
548 | return -EINVAL; | |
549 | ||
550 | ether_addr_copy(eth_addr, mac); | |
551 | ||
552 | rcu_read_lock(); | |
553 | ||
554 | f = __vxlan_find_mac(vxlan, eth_addr, vni); | |
555 | if (!f) { | |
556 | rc = -ENOENT; | |
557 | goto out; | |
558 | } | |
559 | ||
560 | rdst = first_remote_rcu(f); | |
561 | vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, NULL, fdb_info); | |
562 | ||
563 | out: | |
564 | rcu_read_unlock(); | |
565 | return rc; | |
566 | } | |
567 | EXPORT_SYMBOL_GPL(vxlan_fdb_find_uc); | |
568 | ||
569 | static int vxlan_fdb_notify_one(struct notifier_block *nb, | |
570 | const struct vxlan_dev *vxlan, | |
571 | const struct vxlan_fdb *f, | |
572 | const struct vxlan_rdst *rdst, | |
573 | struct netlink_ext_ack *extack) | |
574 | { | |
575 | struct switchdev_notifier_vxlan_fdb_info fdb_info; | |
576 | int rc; | |
577 | ||
578 | vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, extack, &fdb_info); | |
579 | rc = nb->notifier_call(nb, SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE, | |
580 | &fdb_info); | |
581 | return notifier_to_errno(rc); | |
582 | } | |
583 | ||
584 | int vxlan_fdb_replay(const struct net_device *dev, __be32 vni, | |
585 | struct notifier_block *nb, | |
586 | struct netlink_ext_ack *extack) | |
587 | { | |
588 | struct vxlan_dev *vxlan; | |
589 | struct vxlan_rdst *rdst; | |
590 | struct vxlan_fdb *f; | |
591 | unsigned int h; | |
592 | int rc = 0; | |
593 | ||
594 | if (!netif_is_vxlan(dev)) | |
595 | return -EINVAL; | |
596 | vxlan = netdev_priv(dev); | |
597 | ||
598 | for (h = 0; h < FDB_HASH_SIZE; ++h) { | |
599 | spin_lock_bh(&vxlan->hash_lock[h]); | |
600 | hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist) { | |
601 | if (f->vni == vni) { | |
602 | list_for_each_entry(rdst, &f->remotes, list) { | |
603 | rc = vxlan_fdb_notify_one(nb, vxlan, | |
604 | f, rdst, | |
605 | extack); | |
606 | if (rc) | |
607 | goto unlock; | |
608 | } | |
609 | } | |
610 | } | |
611 | spin_unlock_bh(&vxlan->hash_lock[h]); | |
612 | } | |
613 | return 0; | |
614 | ||
615 | unlock: | |
616 | spin_unlock_bh(&vxlan->hash_lock[h]); | |
617 | return rc; | |
618 | } | |
619 | EXPORT_SYMBOL_GPL(vxlan_fdb_replay); | |
620 | ||
621 | void vxlan_fdb_clear_offload(const struct net_device *dev, __be32 vni) | |
622 | { | |
623 | struct vxlan_dev *vxlan; | |
624 | struct vxlan_rdst *rdst; | |
625 | struct vxlan_fdb *f; | |
626 | unsigned int h; | |
627 | ||
628 | if (!netif_is_vxlan(dev)) | |
629 | return; | |
630 | vxlan = netdev_priv(dev); | |
631 | ||
632 | for (h = 0; h < FDB_HASH_SIZE; ++h) { | |
633 | spin_lock_bh(&vxlan->hash_lock[h]); | |
634 | hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist) | |
635 | if (f->vni == vni) | |
636 | list_for_each_entry(rdst, &f->remotes, list) | |
637 | rdst->offloaded = false; | |
638 | spin_unlock_bh(&vxlan->hash_lock[h]); | |
639 | } | |
640 | ||
641 | } | |
642 | EXPORT_SYMBOL_GPL(vxlan_fdb_clear_offload); | |
643 | ||
644 | /* Replace destination of unicast mac */ | |
645 | static int vxlan_fdb_replace(struct vxlan_fdb *f, | |
646 | union vxlan_addr *ip, __be16 port, __be32 vni, | |
647 | __u32 ifindex, struct vxlan_rdst *oldrd) | |
648 | { | |
649 | struct vxlan_rdst *rd; | |
650 | ||
651 | rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex); | |
652 | if (rd) | |
653 | return 0; | |
654 | ||
655 | rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list); | |
656 | if (!rd) | |
657 | return 0; | |
658 | ||
659 | *oldrd = *rd; | |
660 | dst_cache_reset(&rd->dst_cache); | |
661 | rd->remote_ip = *ip; | |
662 | rd->remote_port = port; | |
663 | rd->remote_vni = vni; | |
664 | rd->remote_ifindex = ifindex; | |
665 | rd->offloaded = false; | |
666 | return 1; | |
667 | } | |
668 | ||
669 | /* Add/update destinations for multicast */ | |
670 | static int vxlan_fdb_append(struct vxlan_fdb *f, | |
671 | union vxlan_addr *ip, __be16 port, __be32 vni, | |
672 | __u32 ifindex, struct vxlan_rdst **rdp) | |
673 | { | |
674 | struct vxlan_rdst *rd; | |
675 | ||
676 | rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex); | |
677 | if (rd) | |
678 | return 0; | |
679 | ||
680 | rd = kmalloc(sizeof(*rd), GFP_ATOMIC); | |
681 | if (rd == NULL) | |
682 | return -ENOBUFS; | |
683 | ||
684 | if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) { | |
685 | kfree(rd); | |
686 | return -ENOBUFS; | |
687 | } | |
688 | ||
689 | rd->remote_ip = *ip; | |
690 | rd->remote_port = port; | |
691 | rd->offloaded = false; | |
692 | rd->remote_vni = vni; | |
693 | rd->remote_ifindex = ifindex; | |
694 | ||
695 | list_add_tail_rcu(&rd->list, &f->remotes); | |
696 | ||
697 | *rdp = rd; | |
698 | return 1; | |
699 | } | |
700 | ||
701 | static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb, | |
702 | unsigned int off, | |
703 | struct vxlanhdr *vh, size_t hdrlen, | |
704 | __be32 vni_field, | |
705 | struct gro_remcsum *grc, | |
706 | bool nopartial) | |
707 | { | |
708 | size_t start, offset; | |
709 | ||
710 | if (skb->remcsum_offload) | |
711 | return vh; | |
712 | ||
713 | if (!NAPI_GRO_CB(skb)->csum_valid) | |
714 | return NULL; | |
715 | ||
716 | start = vxlan_rco_start(vni_field); | |
717 | offset = start + vxlan_rco_offset(vni_field); | |
718 | ||
719 | vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen, | |
720 | start, offset, grc, nopartial); | |
721 | ||
722 | skb->remcsum_offload = 1; | |
723 | ||
724 | return vh; | |
725 | } | |
726 | ||
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 sk_buff *p; | |
733 | struct vxlanhdr *vh, *vh2; | |
734 | unsigned int hlen, off_vx; | |
735 | int flush = 1; | |
736 | struct vxlan_sock *vs = rcu_dereference_sk_user_data(sk); | |
737 | __be32 flags; | |
738 | struct gro_remcsum grc; | |
739 | ||
740 | skb_gro_remcsum_init(&grc); | |
741 | ||
742 | off_vx = skb_gro_offset(skb); | |
743 | hlen = off_vx + sizeof(*vh); | |
744 | vh = skb_gro_header_fast(skb, off_vx); | |
745 | if (skb_gro_header_hard(skb, hlen)) { | |
746 | vh = skb_gro_header_slow(skb, hlen, off_vx); | |
747 | if (unlikely(!vh)) | |
748 | goto out; | |
749 | } | |
750 | ||
751 | skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr)); | |
752 | ||
753 | flags = vh->vx_flags; | |
754 | ||
755 | if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) { | |
756 | vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr), | |
757 | vh->vx_vni, &grc, | |
758 | !!(vs->flags & | |
759 | VXLAN_F_REMCSUM_NOPARTIAL)); | |
760 | ||
761 | if (!vh) | |
762 | goto out; | |
763 | } | |
764 | ||
765 | skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */ | |
766 | ||
767 | list_for_each_entry(p, head, list) { | |
768 | if (!NAPI_GRO_CB(p)->same_flow) | |
769 | continue; | |
770 | ||
771 | vh2 = (struct vxlanhdr *)(p->data + off_vx); | |
772 | if (vh->vx_flags != vh2->vx_flags || | |
773 | vh->vx_vni != vh2->vx_vni) { | |
774 | NAPI_GRO_CB(p)->same_flow = 0; | |
775 | continue; | |
776 | } | |
777 | } | |
778 | ||
779 | pp = call_gro_receive(eth_gro_receive, head, skb); | |
780 | flush = 0; | |
781 | ||
782 | out: | |
783 | skb_gro_flush_final_remcsum(skb, pp, flush, &grc); | |
784 | ||
785 | return pp; | |
786 | } | |
787 | ||
788 | static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff) | |
789 | { | |
790 | /* Sets 'skb->inner_mac_header' since we are always called with | |
791 | * 'skb->encapsulation' set. | |
792 | */ | |
793 | return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr)); | |
794 | } | |
795 | ||
796 | static struct vxlan_fdb *vxlan_fdb_alloc(struct vxlan_dev *vxlan, | |
797 | const u8 *mac, __u16 state, | |
798 | __be32 src_vni, __u16 ndm_flags) | |
799 | { | |
800 | struct vxlan_fdb *f; | |
801 | ||
802 | f = kmalloc(sizeof(*f), GFP_ATOMIC); | |
803 | if (!f) | |
804 | return NULL; | |
805 | f->state = state; | |
806 | f->flags = ndm_flags; | |
807 | f->updated = f->used = jiffies; | |
808 | f->vni = src_vni; | |
809 | INIT_LIST_HEAD(&f->remotes); | |
810 | memcpy(f->eth_addr, mac, ETH_ALEN); | |
811 | ||
812 | return f; | |
813 | } | |
814 | ||
815 | static void vxlan_fdb_insert(struct vxlan_dev *vxlan, const u8 *mac, | |
816 | __be32 src_vni, struct vxlan_fdb *f) | |
817 | { | |
818 | ++vxlan->addrcnt; | |
819 | hlist_add_head_rcu(&f->hlist, | |
820 | vxlan_fdb_head(vxlan, mac, src_vni)); | |
821 | } | |
822 | ||
823 | static int vxlan_fdb_create(struct vxlan_dev *vxlan, | |
824 | const u8 *mac, union vxlan_addr *ip, | |
825 | __u16 state, __be16 port, __be32 src_vni, | |
826 | __be32 vni, __u32 ifindex, __u16 ndm_flags, | |
827 | struct vxlan_fdb **fdb) | |
828 | { | |
829 | struct vxlan_rdst *rd = NULL; | |
830 | struct vxlan_fdb *f; | |
831 | int rc; | |
832 | ||
833 | if (vxlan->cfg.addrmax && | |
834 | vxlan->addrcnt >= vxlan->cfg.addrmax) | |
835 | return -ENOSPC; | |
836 | ||
837 | netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip); | |
838 | f = vxlan_fdb_alloc(vxlan, mac, state, src_vni, ndm_flags); | |
839 | if (!f) | |
840 | return -ENOMEM; | |
841 | ||
842 | rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd); | |
843 | if (rc < 0) { | |
844 | kfree(f); | |
845 | return rc; | |
846 | } | |
847 | ||
848 | *fdb = f; | |
849 | ||
850 | return 0; | |
851 | } | |
852 | ||
853 | static void __vxlan_fdb_free(struct vxlan_fdb *f) | |
854 | { | |
855 | struct vxlan_rdst *rd, *nd; | |
856 | ||
857 | list_for_each_entry_safe(rd, nd, &f->remotes, list) { | |
858 | dst_cache_destroy(&rd->dst_cache); | |
859 | kfree(rd); | |
860 | } | |
861 | kfree(f); | |
862 | } | |
863 | ||
864 | static void vxlan_fdb_free(struct rcu_head *head) | |
865 | { | |
866 | struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu); | |
867 | ||
868 | __vxlan_fdb_free(f); | |
869 | } | |
870 | ||
871 | static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f, | |
872 | bool do_notify, bool swdev_notify) | |
873 | { | |
874 | struct vxlan_rdst *rd; | |
875 | ||
876 | netdev_dbg(vxlan->dev, "delete %pM\n", f->eth_addr); | |
877 | ||
878 | --vxlan->addrcnt; | |
879 | if (do_notify) | |
880 | list_for_each_entry(rd, &f->remotes, list) | |
881 | vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH, | |
882 | swdev_notify, NULL); | |
883 | ||
884 | hlist_del_rcu(&f->hlist); | |
885 | call_rcu(&f->rcu, vxlan_fdb_free); | |
886 | } | |
887 | ||
888 | static void vxlan_dst_free(struct rcu_head *head) | |
889 | { | |
890 | struct vxlan_rdst *rd = container_of(head, struct vxlan_rdst, rcu); | |
891 | ||
892 | dst_cache_destroy(&rd->dst_cache); | |
893 | kfree(rd); | |
894 | } | |
895 | ||
896 | static int vxlan_fdb_update_existing(struct vxlan_dev *vxlan, | |
897 | union vxlan_addr *ip, | |
898 | __u16 state, __u16 flags, | |
899 | __be16 port, __be32 vni, | |
900 | __u32 ifindex, __u16 ndm_flags, | |
901 | struct vxlan_fdb *f, | |
902 | bool swdev_notify, | |
903 | struct netlink_ext_ack *extack) | |
904 | { | |
905 | __u16 fdb_flags = (ndm_flags & ~NTF_USE); | |
906 | struct vxlan_rdst *rd = NULL; | |
907 | struct vxlan_rdst oldrd; | |
908 | int notify = 0; | |
909 | int rc = 0; | |
910 | int err; | |
911 | ||
912 | /* Do not allow an externally learned entry to take over an entry added | |
913 | * by the user. | |
914 | */ | |
915 | if (!(fdb_flags & NTF_EXT_LEARNED) || | |
916 | !(f->flags & NTF_VXLAN_ADDED_BY_USER)) { | |
917 | if (f->state != state) { | |
918 | f->state = state; | |
919 | f->updated = jiffies; | |
920 | notify = 1; | |
921 | } | |
922 | if (f->flags != fdb_flags) { | |
923 | f->flags = fdb_flags; | |
924 | f->updated = jiffies; | |
925 | notify = 1; | |
926 | } | |
927 | } | |
928 | ||
929 | if ((flags & NLM_F_REPLACE)) { | |
930 | /* Only change unicasts */ | |
931 | if (!(is_multicast_ether_addr(f->eth_addr) || | |
932 | is_zero_ether_addr(f->eth_addr))) { | |
933 | rc = vxlan_fdb_replace(f, ip, port, vni, | |
934 | ifindex, &oldrd); | |
935 | notify |= rc; | |
936 | } else { | |
937 | return -EOPNOTSUPP; | |
938 | } | |
939 | } | |
940 | if ((flags & NLM_F_APPEND) && | |
941 | (is_multicast_ether_addr(f->eth_addr) || | |
942 | is_zero_ether_addr(f->eth_addr))) { | |
943 | rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd); | |
944 | ||
945 | if (rc < 0) | |
946 | return rc; | |
947 | notify |= rc; | |
948 | } | |
949 | ||
950 | if (ndm_flags & NTF_USE) | |
951 | f->used = jiffies; | |
952 | ||
953 | if (notify) { | |
954 | if (rd == NULL) | |
955 | rd = first_remote_rtnl(f); | |
956 | ||
957 | err = vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH, | |
958 | swdev_notify, extack); | |
959 | if (err) | |
960 | goto err_notify; | |
961 | } | |
962 | ||
963 | return 0; | |
964 | ||
965 | err_notify: | |
966 | if ((flags & NLM_F_REPLACE) && rc) | |
967 | *rd = oldrd; | |
968 | else if ((flags & NLM_F_APPEND) && rc) { | |
969 | list_del_rcu(&rd->list); | |
970 | call_rcu(&rd->rcu, vxlan_dst_free); | |
971 | } | |
972 | return err; | |
973 | } | |
974 | ||
975 | static int vxlan_fdb_update_create(struct vxlan_dev *vxlan, | |
976 | const u8 *mac, union vxlan_addr *ip, | |
977 | __u16 state, __u16 flags, | |
978 | __be16 port, __be32 src_vni, __be32 vni, | |
979 | __u32 ifindex, __u16 ndm_flags, | |
980 | bool swdev_notify, | |
981 | struct netlink_ext_ack *extack) | |
982 | { | |
983 | __u16 fdb_flags = (ndm_flags & ~NTF_USE); | |
984 | struct vxlan_fdb *f; | |
985 | int rc; | |
986 | ||
987 | /* Disallow replace to add a multicast entry */ | |
988 | if ((flags & NLM_F_REPLACE) && | |
989 | (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac))) | |
990 | return -EOPNOTSUPP; | |
991 | ||
992 | netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip); | |
993 | rc = vxlan_fdb_create(vxlan, mac, ip, state, port, src_vni, | |
994 | vni, ifindex, fdb_flags, &f); | |
995 | if (rc < 0) | |
996 | return rc; | |
997 | ||
998 | vxlan_fdb_insert(vxlan, mac, src_vni, f); | |
999 | rc = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_NEWNEIGH, | |
1000 | swdev_notify, extack); | |
1001 | if (rc) | |
1002 | goto err_notify; | |
1003 | ||
1004 | return 0; | |
1005 | ||
1006 | err_notify: | |
1007 | vxlan_fdb_destroy(vxlan, f, false, false); | |
1008 | return rc; | |
1009 | } | |
1010 | ||
1011 | /* Add new entry to forwarding table -- assumes lock held */ | |
1012 | static int vxlan_fdb_update(struct vxlan_dev *vxlan, | |
1013 | const u8 *mac, union vxlan_addr *ip, | |
1014 | __u16 state, __u16 flags, | |
1015 | __be16 port, __be32 src_vni, __be32 vni, | |
1016 | __u32 ifindex, __u16 ndm_flags, | |
1017 | bool swdev_notify, | |
1018 | struct netlink_ext_ack *extack) | |
1019 | { | |
1020 | struct vxlan_fdb *f; | |
1021 | ||
1022 | f = __vxlan_find_mac(vxlan, mac, src_vni); | |
1023 | if (f) { | |
1024 | if (flags & NLM_F_EXCL) { | |
1025 | netdev_dbg(vxlan->dev, | |
1026 | "lost race to create %pM\n", mac); | |
1027 | return -EEXIST; | |
1028 | } | |
1029 | ||
1030 | return vxlan_fdb_update_existing(vxlan, ip, state, flags, port, | |
1031 | vni, ifindex, ndm_flags, f, | |
1032 | swdev_notify, extack); | |
1033 | } else { | |
1034 | if (!(flags & NLM_F_CREATE)) | |
1035 | return -ENOENT; | |
1036 | ||
1037 | return vxlan_fdb_update_create(vxlan, mac, ip, state, flags, | |
1038 | port, src_vni, vni, ifindex, | |
1039 | ndm_flags, swdev_notify, extack); | |
1040 | } | |
1041 | } | |
1042 | ||
1043 | static void vxlan_fdb_dst_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f, | |
1044 | struct vxlan_rdst *rd, bool swdev_notify) | |
1045 | { | |
1046 | list_del_rcu(&rd->list); | |
1047 | vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH, swdev_notify, NULL); | |
1048 | call_rcu(&rd->rcu, vxlan_dst_free); | |
1049 | } | |
1050 | ||
1051 | static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan, | |
1052 | union vxlan_addr *ip, __be16 *port, __be32 *src_vni, | |
1053 | __be32 *vni, u32 *ifindex) | |
1054 | { | |
1055 | struct net *net = dev_net(vxlan->dev); | |
1056 | int err; | |
1057 | ||
1058 | if (tb[NDA_DST]) { | |
1059 | err = vxlan_nla_get_addr(ip, tb[NDA_DST]); | |
1060 | if (err) | |
1061 | return err; | |
1062 | } else { | |
1063 | union vxlan_addr *remote = &vxlan->default_dst.remote_ip; | |
1064 | if (remote->sa.sa_family == AF_INET) { | |
1065 | ip->sin.sin_addr.s_addr = htonl(INADDR_ANY); | |
1066 | ip->sa.sa_family = AF_INET; | |
1067 | #if IS_ENABLED(CONFIG_IPV6) | |
1068 | } else { | |
1069 | ip->sin6.sin6_addr = in6addr_any; | |
1070 | ip->sa.sa_family = AF_INET6; | |
1071 | #endif | |
1072 | } | |
1073 | } | |
1074 | ||
1075 | if (tb[NDA_PORT]) { | |
1076 | if (nla_len(tb[NDA_PORT]) != sizeof(__be16)) | |
1077 | return -EINVAL; | |
1078 | *port = nla_get_be16(tb[NDA_PORT]); | |
1079 | } else { | |
1080 | *port = vxlan->cfg.dst_port; | |
1081 | } | |
1082 | ||
1083 | if (tb[NDA_VNI]) { | |
1084 | if (nla_len(tb[NDA_VNI]) != sizeof(u32)) | |
1085 | return -EINVAL; | |
1086 | *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI])); | |
1087 | } else { | |
1088 | *vni = vxlan->default_dst.remote_vni; | |
1089 | } | |
1090 | ||
1091 | if (tb[NDA_SRC_VNI]) { | |
1092 | if (nla_len(tb[NDA_SRC_VNI]) != sizeof(u32)) | |
1093 | return -EINVAL; | |
1094 | *src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI])); | |
1095 | } else { | |
1096 | *src_vni = vxlan->default_dst.remote_vni; | |
1097 | } | |
1098 | ||
1099 | if (tb[NDA_IFINDEX]) { | |
1100 | struct net_device *tdev; | |
1101 | ||
1102 | if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32)) | |
1103 | return -EINVAL; | |
1104 | *ifindex = nla_get_u32(tb[NDA_IFINDEX]); | |
1105 | tdev = __dev_get_by_index(net, *ifindex); | |
1106 | if (!tdev) | |
1107 | return -EADDRNOTAVAIL; | |
1108 | } else { | |
1109 | *ifindex = 0; | |
1110 | } | |
1111 | ||
1112 | return 0; | |
1113 | } | |
1114 | ||
1115 | /* Add static entry (via netlink) */ | |
1116 | static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], | |
1117 | struct net_device *dev, | |
1118 | const unsigned char *addr, u16 vid, u16 flags, | |
1119 | struct netlink_ext_ack *extack) | |
1120 | { | |
1121 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1122 | /* struct net *net = dev_net(vxlan->dev); */ | |
1123 | union vxlan_addr ip; | |
1124 | __be16 port; | |
1125 | __be32 src_vni, vni; | |
1126 | u32 ifindex; | |
1127 | u32 hash_index; | |
1128 | int err; | |
1129 | ||
1130 | if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) { | |
1131 | pr_info("RTM_NEWNEIGH with invalid state %#x\n", | |
1132 | ndm->ndm_state); | |
1133 | return -EINVAL; | |
1134 | } | |
1135 | ||
1136 | if (tb[NDA_DST] == NULL) | |
1137 | return -EINVAL; | |
1138 | ||
1139 | err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex); | |
1140 | if (err) | |
1141 | return err; | |
1142 | ||
1143 | if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family) | |
1144 | return -EAFNOSUPPORT; | |
1145 | ||
1146 | hash_index = fdb_head_index(vxlan, addr, src_vni); | |
1147 | spin_lock_bh(&vxlan->hash_lock[hash_index]); | |
1148 | err = vxlan_fdb_update(vxlan, addr, &ip, ndm->ndm_state, flags, | |
1149 | port, src_vni, vni, ifindex, | |
1150 | ndm->ndm_flags | NTF_VXLAN_ADDED_BY_USER, | |
1151 | true, extack); | |
1152 | spin_unlock_bh(&vxlan->hash_lock[hash_index]); | |
1153 | ||
1154 | return err; | |
1155 | } | |
1156 | ||
1157 | static int __vxlan_fdb_delete(struct vxlan_dev *vxlan, | |
1158 | const unsigned char *addr, union vxlan_addr ip, | |
1159 | __be16 port, __be32 src_vni, __be32 vni, | |
1160 | u32 ifindex, bool swdev_notify) | |
1161 | { | |
1162 | struct vxlan_fdb *f; | |
1163 | struct vxlan_rdst *rd = NULL; | |
1164 | int err = -ENOENT; | |
1165 | ||
1166 | f = vxlan_find_mac(vxlan, addr, src_vni); | |
1167 | if (!f) | |
1168 | return err; | |
1169 | ||
1170 | if (!vxlan_addr_any(&ip)) { | |
1171 | rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex); | |
1172 | if (!rd) | |
1173 | goto out; | |
1174 | } | |
1175 | ||
1176 | /* remove a destination if it's not the only one on the list, | |
1177 | * otherwise destroy the fdb entry | |
1178 | */ | |
1179 | if (rd && !list_is_singular(&f->remotes)) { | |
1180 | vxlan_fdb_dst_destroy(vxlan, f, rd, swdev_notify); | |
1181 | goto out; | |
1182 | } | |
1183 | ||
1184 | vxlan_fdb_destroy(vxlan, f, true, swdev_notify); | |
1185 | ||
1186 | out: | |
1187 | return 0; | |
1188 | } | |
1189 | ||
1190 | /* Delete entry (via netlink) */ | |
1191 | static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[], | |
1192 | struct net_device *dev, | |
1193 | const unsigned char *addr, u16 vid) | |
1194 | { | |
1195 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1196 | union vxlan_addr ip; | |
1197 | __be32 src_vni, vni; | |
1198 | __be16 port; | |
1199 | u32 ifindex; | |
1200 | u32 hash_index; | |
1201 | int err; | |
1202 | ||
1203 | err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex); | |
1204 | if (err) | |
1205 | return err; | |
1206 | ||
1207 | hash_index = fdb_head_index(vxlan, addr, src_vni); | |
1208 | spin_lock_bh(&vxlan->hash_lock[hash_index]); | |
1209 | err = __vxlan_fdb_delete(vxlan, addr, ip, port, src_vni, vni, ifindex, | |
1210 | true); | |
1211 | spin_unlock_bh(&vxlan->hash_lock[hash_index]); | |
1212 | ||
1213 | return err; | |
1214 | } | |
1215 | ||
1216 | /* Dump forwarding table */ | |
1217 | static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb, | |
1218 | struct net_device *dev, | |
1219 | struct net_device *filter_dev, int *idx) | |
1220 | { | |
1221 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1222 | unsigned int h; | |
1223 | int err = 0; | |
1224 | ||
1225 | for (h = 0; h < FDB_HASH_SIZE; ++h) { | |
1226 | struct vxlan_fdb *f; | |
1227 | ||
1228 | hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) { | |
1229 | struct vxlan_rdst *rd; | |
1230 | ||
1231 | list_for_each_entry_rcu(rd, &f->remotes, list) { | |
1232 | if (*idx < cb->args[2]) | |
1233 | goto skip; | |
1234 | ||
1235 | err = vxlan_fdb_info(skb, vxlan, f, | |
1236 | NETLINK_CB(cb->skb).portid, | |
1237 | cb->nlh->nlmsg_seq, | |
1238 | RTM_NEWNEIGH, | |
1239 | NLM_F_MULTI, rd); | |
1240 | if (err < 0) | |
1241 | goto out; | |
1242 | skip: | |
1243 | *idx += 1; | |
1244 | } | |
1245 | } | |
1246 | } | |
1247 | out: | |
1248 | return err; | |
1249 | } | |
1250 | ||
1251 | static int vxlan_fdb_get(struct sk_buff *skb, | |
1252 | struct nlattr *tb[], | |
1253 | struct net_device *dev, | |
1254 | const unsigned char *addr, | |
1255 | u16 vid, u32 portid, u32 seq, | |
1256 | struct netlink_ext_ack *extack) | |
1257 | { | |
1258 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1259 | struct vxlan_fdb *f; | |
1260 | __be32 vni; | |
1261 | int err; | |
1262 | ||
1263 | if (tb[NDA_VNI]) | |
1264 | vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI])); | |
1265 | else | |
1266 | vni = vxlan->default_dst.remote_vni; | |
1267 | ||
1268 | rcu_read_lock(); | |
1269 | ||
1270 | f = __vxlan_find_mac(vxlan, addr, vni); | |
1271 | if (!f) { | |
1272 | NL_SET_ERR_MSG(extack, "Fdb entry not found"); | |
1273 | err = -ENOENT; | |
1274 | goto errout; | |
1275 | } | |
1276 | ||
1277 | err = vxlan_fdb_info(skb, vxlan, f, portid, seq, | |
1278 | RTM_NEWNEIGH, 0, first_remote_rcu(f)); | |
1279 | errout: | |
1280 | rcu_read_unlock(); | |
1281 | return err; | |
1282 | } | |
1283 | ||
1284 | /* Watch incoming packets to learn mapping between Ethernet address | |
1285 | * and Tunnel endpoint. | |
1286 | * Return true if packet is bogus and should be dropped. | |
1287 | */ | |
1288 | static bool vxlan_snoop(struct net_device *dev, | |
1289 | union vxlan_addr *src_ip, const u8 *src_mac, | |
1290 | u32 src_ifindex, __be32 vni) | |
1291 | { | |
1292 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1293 | struct vxlan_fdb *f; | |
1294 | u32 ifindex = 0; | |
1295 | ||
1296 | #if IS_ENABLED(CONFIG_IPV6) | |
1297 | if (src_ip->sa.sa_family == AF_INET6 && | |
1298 | (ipv6_addr_type(&src_ip->sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL)) | |
1299 | ifindex = src_ifindex; | |
1300 | #endif | |
1301 | ||
1302 | f = vxlan_find_mac(vxlan, src_mac, vni); | |
1303 | if (likely(f)) { | |
1304 | struct vxlan_rdst *rdst = first_remote_rcu(f); | |
1305 | ||
1306 | if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip) && | |
1307 | rdst->remote_ifindex == ifindex)) | |
1308 | return false; | |
1309 | ||
1310 | /* Don't migrate static entries, drop packets */ | |
1311 | if (f->state & (NUD_PERMANENT | NUD_NOARP)) | |
1312 | return true; | |
1313 | ||
1314 | if (net_ratelimit()) | |
1315 | netdev_info(dev, | |
1316 | "%pM migrated from %pIS to %pIS\n", | |
1317 | src_mac, &rdst->remote_ip.sa, &src_ip->sa); | |
1318 | ||
1319 | rdst->remote_ip = *src_ip; | |
1320 | f->updated = jiffies; | |
1321 | vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH, true, NULL); | |
1322 | } else { | |
1323 | u32 hash_index = fdb_head_index(vxlan, src_mac, vni); | |
1324 | ||
1325 | /* learned new entry */ | |
1326 | spin_lock(&vxlan->hash_lock[hash_index]); | |
1327 | ||
1328 | /* close off race between vxlan_flush and incoming packets */ | |
1329 | if (netif_running(dev)) | |
1330 | vxlan_fdb_update(vxlan, src_mac, src_ip, | |
1331 | NUD_REACHABLE, | |
1332 | NLM_F_EXCL|NLM_F_CREATE, | |
1333 | vxlan->cfg.dst_port, | |
1334 | vni, | |
1335 | vxlan->default_dst.remote_vni, | |
1336 | ifindex, NTF_SELF, true, NULL); | |
1337 | spin_unlock(&vxlan->hash_lock[hash_index]); | |
1338 | } | |
1339 | ||
1340 | return false; | |
1341 | } | |
1342 | ||
1343 | /* See if multicast group is already in use by other ID */ | |
1344 | static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev) | |
1345 | { | |
1346 | struct vxlan_dev *vxlan; | |
1347 | struct vxlan_sock *sock4; | |
1348 | #if IS_ENABLED(CONFIG_IPV6) | |
1349 | struct vxlan_sock *sock6; | |
1350 | #endif | |
1351 | unsigned short family = dev->default_dst.remote_ip.sa.sa_family; | |
1352 | ||
1353 | sock4 = rtnl_dereference(dev->vn4_sock); | |
1354 | ||
1355 | /* The vxlan_sock is only used by dev, leaving group has | |
1356 | * no effect on other vxlan devices. | |
1357 | */ | |
1358 | if (family == AF_INET && sock4 && refcount_read(&sock4->refcnt) == 1) | |
1359 | return false; | |
1360 | #if IS_ENABLED(CONFIG_IPV6) | |
1361 | sock6 = rtnl_dereference(dev->vn6_sock); | |
1362 | if (family == AF_INET6 && sock6 && refcount_read(&sock6->refcnt) == 1) | |
1363 | return false; | |
1364 | #endif | |
1365 | ||
1366 | list_for_each_entry(vxlan, &vn->vxlan_list, next) { | |
1367 | if (!netif_running(vxlan->dev) || vxlan == dev) | |
1368 | continue; | |
1369 | ||
1370 | if (family == AF_INET && | |
1371 | rtnl_dereference(vxlan->vn4_sock) != sock4) | |
1372 | continue; | |
1373 | #if IS_ENABLED(CONFIG_IPV6) | |
1374 | if (family == AF_INET6 && | |
1375 | rtnl_dereference(vxlan->vn6_sock) != sock6) | |
1376 | continue; | |
1377 | #endif | |
1378 | ||
1379 | if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip, | |
1380 | &dev->default_dst.remote_ip)) | |
1381 | continue; | |
1382 | ||
1383 | if (vxlan->default_dst.remote_ifindex != | |
1384 | dev->default_dst.remote_ifindex) | |
1385 | continue; | |
1386 | ||
1387 | return true; | |
1388 | } | |
1389 | ||
1390 | return false; | |
1391 | } | |
1392 | ||
1393 | static bool __vxlan_sock_release_prep(struct vxlan_sock *vs) | |
1394 | { | |
1395 | struct vxlan_net *vn; | |
1396 | ||
1397 | if (!vs) | |
1398 | return false; | |
1399 | if (!refcount_dec_and_test(&vs->refcnt)) | |
1400 | return false; | |
1401 | ||
1402 | vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id); | |
1403 | spin_lock(&vn->sock_lock); | |
1404 | hlist_del_rcu(&vs->hlist); | |
1405 | udp_tunnel_notify_del_rx_port(vs->sock, | |
1406 | (vs->flags & VXLAN_F_GPE) ? | |
1407 | UDP_TUNNEL_TYPE_VXLAN_GPE : | |
1408 | UDP_TUNNEL_TYPE_VXLAN); | |
1409 | spin_unlock(&vn->sock_lock); | |
1410 | ||
1411 | return true; | |
1412 | } | |
1413 | ||
1414 | static void vxlan_sock_release(struct vxlan_dev *vxlan) | |
1415 | { | |
1416 | struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock); | |
1417 | #if IS_ENABLED(CONFIG_IPV6) | |
1418 | struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock); | |
1419 | ||
1420 | RCU_INIT_POINTER(vxlan->vn6_sock, NULL); | |
1421 | #endif | |
1422 | ||
1423 | RCU_INIT_POINTER(vxlan->vn4_sock, NULL); | |
1424 | synchronize_net(); | |
1425 | ||
1426 | vxlan_vs_del_dev(vxlan); | |
1427 | ||
1428 | if (__vxlan_sock_release_prep(sock4)) { | |
1429 | udp_tunnel_sock_release(sock4->sock); | |
1430 | kfree(sock4); | |
1431 | } | |
1432 | ||
1433 | #if IS_ENABLED(CONFIG_IPV6) | |
1434 | if (__vxlan_sock_release_prep(sock6)) { | |
1435 | udp_tunnel_sock_release(sock6->sock); | |
1436 | kfree(sock6); | |
1437 | } | |
1438 | #endif | |
1439 | } | |
1440 | ||
1441 | /* Update multicast group membership when first VNI on | |
1442 | * multicast address is brought up | |
1443 | */ | |
1444 | static int vxlan_igmp_join(struct vxlan_dev *vxlan) | |
1445 | { | |
1446 | struct sock *sk; | |
1447 | union vxlan_addr *ip = &vxlan->default_dst.remote_ip; | |
1448 | int ifindex = vxlan->default_dst.remote_ifindex; | |
1449 | int ret = -EINVAL; | |
1450 | ||
1451 | if (ip->sa.sa_family == AF_INET) { | |
1452 | struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock); | |
1453 | struct ip_mreqn mreq = { | |
1454 | .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr, | |
1455 | .imr_ifindex = ifindex, | |
1456 | }; | |
1457 | ||
1458 | sk = sock4->sock->sk; | |
1459 | lock_sock(sk); | |
1460 | ret = ip_mc_join_group(sk, &mreq); | |
1461 | release_sock(sk); | |
1462 | #if IS_ENABLED(CONFIG_IPV6) | |
1463 | } else { | |
1464 | struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock); | |
1465 | ||
1466 | sk = sock6->sock->sk; | |
1467 | lock_sock(sk); | |
1468 | ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex, | |
1469 | &ip->sin6.sin6_addr); | |
1470 | release_sock(sk); | |
1471 | #endif | |
1472 | } | |
1473 | ||
1474 | return ret; | |
1475 | } | |
1476 | ||
1477 | /* Inverse of vxlan_igmp_join when last VNI is brought down */ | |
1478 | static int vxlan_igmp_leave(struct vxlan_dev *vxlan) | |
1479 | { | |
1480 | struct sock *sk; | |
1481 | union vxlan_addr *ip = &vxlan->default_dst.remote_ip; | |
1482 | int ifindex = vxlan->default_dst.remote_ifindex; | |
1483 | int ret = -EINVAL; | |
1484 | ||
1485 | if (ip->sa.sa_family == AF_INET) { | |
1486 | struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock); | |
1487 | struct ip_mreqn mreq = { | |
1488 | .imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr, | |
1489 | .imr_ifindex = ifindex, | |
1490 | }; | |
1491 | ||
1492 | sk = sock4->sock->sk; | |
1493 | lock_sock(sk); | |
1494 | ret = ip_mc_leave_group(sk, &mreq); | |
1495 | release_sock(sk); | |
1496 | #if IS_ENABLED(CONFIG_IPV6) | |
1497 | } else { | |
1498 | struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock); | |
1499 | ||
1500 | sk = sock6->sock->sk; | |
1501 | lock_sock(sk); | |
1502 | ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex, | |
1503 | &ip->sin6.sin6_addr); | |
1504 | release_sock(sk); | |
1505 | #endif | |
1506 | } | |
1507 | ||
1508 | return ret; | |
1509 | } | |
1510 | ||
1511 | static bool vxlan_remcsum(struct vxlanhdr *unparsed, | |
1512 | struct sk_buff *skb, u32 vxflags) | |
1513 | { | |
1514 | size_t start, offset; | |
1515 | ||
1516 | if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload) | |
1517 | goto out; | |
1518 | ||
1519 | start = vxlan_rco_start(unparsed->vx_vni); | |
1520 | offset = start + vxlan_rco_offset(unparsed->vx_vni); | |
1521 | ||
1522 | if (!pskb_may_pull(skb, offset + sizeof(u16))) | |
1523 | return false; | |
1524 | ||
1525 | skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset, | |
1526 | !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL)); | |
1527 | out: | |
1528 | unparsed->vx_flags &= ~VXLAN_HF_RCO; | |
1529 | unparsed->vx_vni &= VXLAN_VNI_MASK; | |
1530 | return true; | |
1531 | } | |
1532 | ||
1533 | static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed, | |
1534 | struct sk_buff *skb, u32 vxflags, | |
1535 | struct vxlan_metadata *md) | |
1536 | { | |
1537 | struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed; | |
1538 | struct metadata_dst *tun_dst; | |
1539 | ||
1540 | if (!(unparsed->vx_flags & VXLAN_HF_GBP)) | |
1541 | goto out; | |
1542 | ||
1543 | md->gbp = ntohs(gbp->policy_id); | |
1544 | ||
1545 | tun_dst = (struct metadata_dst *)skb_dst(skb); | |
1546 | if (tun_dst) { | |
1547 | tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT; | |
1548 | tun_dst->u.tun_info.options_len = sizeof(*md); | |
1549 | } | |
1550 | if (gbp->dont_learn) | |
1551 | md->gbp |= VXLAN_GBP_DONT_LEARN; | |
1552 | ||
1553 | if (gbp->policy_applied) | |
1554 | md->gbp |= VXLAN_GBP_POLICY_APPLIED; | |
1555 | ||
1556 | /* In flow-based mode, GBP is carried in dst_metadata */ | |
1557 | if (!(vxflags & VXLAN_F_COLLECT_METADATA)) | |
1558 | skb->mark = md->gbp; | |
1559 | out: | |
1560 | unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS; | |
1561 | } | |
1562 | ||
1563 | static bool vxlan_parse_gpe_hdr(struct vxlanhdr *unparsed, | |
1564 | __be16 *protocol, | |
1565 | struct sk_buff *skb, u32 vxflags) | |
1566 | { | |
1567 | struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)unparsed; | |
1568 | ||
1569 | /* Need to have Next Protocol set for interfaces in GPE mode. */ | |
1570 | if (!gpe->np_applied) | |
1571 | return false; | |
1572 | /* "The initial version is 0. If a receiver does not support the | |
1573 | * version indicated it MUST drop the packet. | |
1574 | */ | |
1575 | if (gpe->version != 0) | |
1576 | return false; | |
1577 | /* "When the O bit is set to 1, the packet is an OAM packet and OAM | |
1578 | * processing MUST occur." However, we don't implement OAM | |
1579 | * processing, thus drop the packet. | |
1580 | */ | |
1581 | if (gpe->oam_flag) | |
1582 | return false; | |
1583 | ||
1584 | *protocol = tun_p_to_eth_p(gpe->next_protocol); | |
1585 | if (!*protocol) | |
1586 | return false; | |
1587 | ||
1588 | unparsed->vx_flags &= ~VXLAN_GPE_USED_BITS; | |
1589 | return true; | |
1590 | } | |
1591 | ||
1592 | static bool vxlan_set_mac(struct vxlan_dev *vxlan, | |
1593 | struct vxlan_sock *vs, | |
1594 | struct sk_buff *skb, __be32 vni) | |
1595 | { | |
1596 | union vxlan_addr saddr; | |
1597 | u32 ifindex = skb->dev->ifindex; | |
1598 | ||
1599 | skb_reset_mac_header(skb); | |
1600 | skb->protocol = eth_type_trans(skb, vxlan->dev); | |
1601 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); | |
1602 | ||
1603 | /* Ignore packet loops (and multicast echo) */ | |
1604 | if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr)) | |
1605 | return false; | |
1606 | ||
1607 | /* Get address from the outer IP header */ | |
1608 | if (vxlan_get_sk_family(vs) == AF_INET) { | |
1609 | saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr; | |
1610 | saddr.sa.sa_family = AF_INET; | |
1611 | #if IS_ENABLED(CONFIG_IPV6) | |
1612 | } else { | |
1613 | saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr; | |
1614 | saddr.sa.sa_family = AF_INET6; | |
1615 | #endif | |
1616 | } | |
1617 | ||
1618 | if ((vxlan->cfg.flags & VXLAN_F_LEARN) && | |
1619 | vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source, ifindex, vni)) | |
1620 | return false; | |
1621 | ||
1622 | return true; | |
1623 | } | |
1624 | ||
1625 | static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph, | |
1626 | struct sk_buff *skb) | |
1627 | { | |
1628 | int err = 0; | |
1629 | ||
1630 | if (vxlan_get_sk_family(vs) == AF_INET) | |
1631 | err = IP_ECN_decapsulate(oiph, skb); | |
1632 | #if IS_ENABLED(CONFIG_IPV6) | |
1633 | else | |
1634 | err = IP6_ECN_decapsulate(oiph, skb); | |
1635 | #endif | |
1636 | ||
1637 | if (unlikely(err) && log_ecn_error) { | |
1638 | if (vxlan_get_sk_family(vs) == AF_INET) | |
1639 | net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", | |
1640 | &((struct iphdr *)oiph)->saddr, | |
1641 | ((struct iphdr *)oiph)->tos); | |
1642 | else | |
1643 | net_info_ratelimited("non-ECT from %pI6\n", | |
1644 | &((struct ipv6hdr *)oiph)->saddr); | |
1645 | } | |
1646 | return err <= 1; | |
1647 | } | |
1648 | ||
1649 | /* Callback from net/ipv4/udp.c to receive packets */ | |
1650 | static int vxlan_rcv(struct sock *sk, struct sk_buff *skb) | |
1651 | { | |
1652 | struct pcpu_sw_netstats *stats; | |
1653 | struct vxlan_dev *vxlan; | |
1654 | struct vxlan_sock *vs; | |
1655 | struct vxlanhdr unparsed; | |
1656 | struct vxlan_metadata _md; | |
1657 | struct vxlan_metadata *md = &_md; | |
1658 | __be16 protocol = htons(ETH_P_TEB); | |
1659 | bool raw_proto = false; | |
1660 | void *oiph; | |
1661 | __be32 vni = 0; | |
1662 | ||
1663 | /* Need UDP and VXLAN header to be present */ | |
1664 | if (!pskb_may_pull(skb, VXLAN_HLEN)) | |
1665 | goto drop; | |
1666 | ||
1667 | unparsed = *vxlan_hdr(skb); | |
1668 | /* VNI flag always required to be set */ | |
1669 | if (!(unparsed.vx_flags & VXLAN_HF_VNI)) { | |
1670 | netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n", | |
1671 | ntohl(vxlan_hdr(skb)->vx_flags), | |
1672 | ntohl(vxlan_hdr(skb)->vx_vni)); | |
1673 | /* Return non vxlan pkt */ | |
1674 | goto drop; | |
1675 | } | |
1676 | unparsed.vx_flags &= ~VXLAN_HF_VNI; | |
1677 | unparsed.vx_vni &= ~VXLAN_VNI_MASK; | |
1678 | ||
1679 | vs = rcu_dereference_sk_user_data(sk); | |
1680 | if (!vs) | |
1681 | goto drop; | |
1682 | ||
1683 | vni = vxlan_vni(vxlan_hdr(skb)->vx_vni); | |
1684 | ||
1685 | vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni); | |
1686 | if (!vxlan) | |
1687 | goto drop; | |
1688 | ||
1689 | /* For backwards compatibility, only allow reserved fields to be | |
1690 | * used by VXLAN extensions if explicitly requested. | |
1691 | */ | |
1692 | if (vs->flags & VXLAN_F_GPE) { | |
1693 | if (!vxlan_parse_gpe_hdr(&unparsed, &protocol, skb, vs->flags)) | |
1694 | goto drop; | |
1695 | raw_proto = true; | |
1696 | } | |
1697 | ||
1698 | if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto, | |
1699 | !net_eq(vxlan->net, dev_net(vxlan->dev)))) | |
1700 | goto drop; | |
1701 | ||
1702 | if (vxlan_collect_metadata(vs)) { | |
1703 | struct metadata_dst *tun_dst; | |
1704 | ||
1705 | tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY, | |
1706 | key32_to_tunnel_id(vni), sizeof(*md)); | |
1707 | ||
1708 | if (!tun_dst) | |
1709 | goto drop; | |
1710 | ||
1711 | md = ip_tunnel_info_opts(&tun_dst->u.tun_info); | |
1712 | ||
1713 | skb_dst_set(skb, (struct dst_entry *)tun_dst); | |
1714 | } else { | |
1715 | memset(md, 0, sizeof(*md)); | |
1716 | } | |
1717 | ||
1718 | if (vs->flags & VXLAN_F_REMCSUM_RX) | |
1719 | if (!vxlan_remcsum(&unparsed, skb, vs->flags)) | |
1720 | goto drop; | |
1721 | if (vs->flags & VXLAN_F_GBP) | |
1722 | vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md); | |
1723 | /* Note that GBP and GPE can never be active together. This is | |
1724 | * ensured in vxlan_dev_configure. | |
1725 | */ | |
1726 | ||
1727 | if (unparsed.vx_flags || unparsed.vx_vni) { | |
1728 | /* If there are any unprocessed flags remaining treat | |
1729 | * this as a malformed packet. This behavior diverges from | |
1730 | * VXLAN RFC (RFC7348) which stipulates that bits in reserved | |
1731 | * in reserved fields are to be ignored. The approach here | |
1732 | * maintains compatibility with previous stack code, and also | |
1733 | * is more robust and provides a little more security in | |
1734 | * adding extensions to VXLAN. | |
1735 | */ | |
1736 | goto drop; | |
1737 | } | |
1738 | ||
1739 | if (!raw_proto) { | |
1740 | if (!vxlan_set_mac(vxlan, vs, skb, vni)) | |
1741 | goto drop; | |
1742 | } else { | |
1743 | skb_reset_mac_header(skb); | |
1744 | skb->dev = vxlan->dev; | |
1745 | skb->pkt_type = PACKET_HOST; | |
1746 | } | |
1747 | ||
1748 | oiph = skb_network_header(skb); | |
1749 | skb_reset_network_header(skb); | |
1750 | ||
1751 | if (!vxlan_ecn_decapsulate(vs, oiph, skb)) { | |
1752 | ++vxlan->dev->stats.rx_frame_errors; | |
1753 | ++vxlan->dev->stats.rx_errors; | |
1754 | goto drop; | |
1755 | } | |
1756 | ||
1757 | rcu_read_lock(); | |
1758 | ||
1759 | if (unlikely(!(vxlan->dev->flags & IFF_UP))) { | |
1760 | rcu_read_unlock(); | |
1761 | atomic_long_inc(&vxlan->dev->rx_dropped); | |
1762 | goto drop; | |
1763 | } | |
1764 | ||
1765 | stats = this_cpu_ptr(vxlan->dev->tstats); | |
1766 | u64_stats_update_begin(&stats->syncp); | |
1767 | stats->rx_packets++; | |
1768 | stats->rx_bytes += skb->len; | |
1769 | u64_stats_update_end(&stats->syncp); | |
1770 | ||
1771 | gro_cells_receive(&vxlan->gro_cells, skb); | |
1772 | ||
1773 | rcu_read_unlock(); | |
1774 | ||
1775 | return 0; | |
1776 | ||
1777 | drop: | |
1778 | /* Consume bad packet */ | |
1779 | kfree_skb(skb); | |
1780 | return 0; | |
1781 | } | |
1782 | ||
1783 | /* Callback from net/ipv{4,6}/udp.c to check that we have a VNI for errors */ | |
1784 | static int vxlan_err_lookup(struct sock *sk, struct sk_buff *skb) | |
1785 | { | |
1786 | struct vxlan_dev *vxlan; | |
1787 | struct vxlan_sock *vs; | |
1788 | struct vxlanhdr *hdr; | |
1789 | __be32 vni; | |
1790 | ||
1791 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + VXLAN_HLEN)) | |
1792 | return -EINVAL; | |
1793 | ||
1794 | hdr = vxlan_hdr(skb); | |
1795 | ||
1796 | if (!(hdr->vx_flags & VXLAN_HF_VNI)) | |
1797 | return -EINVAL; | |
1798 | ||
1799 | vs = rcu_dereference_sk_user_data(sk); | |
1800 | if (!vs) | |
1801 | return -ENOENT; | |
1802 | ||
1803 | vni = vxlan_vni(hdr->vx_vni); | |
1804 | vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni); | |
1805 | if (!vxlan) | |
1806 | return -ENOENT; | |
1807 | ||
1808 | return 0; | |
1809 | } | |
1810 | ||
1811 | static int arp_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni) | |
1812 | { | |
1813 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1814 | struct arphdr *parp; | |
1815 | u8 *arpptr, *sha; | |
1816 | __be32 sip, tip; | |
1817 | struct neighbour *n; | |
1818 | ||
1819 | if (dev->flags & IFF_NOARP) | |
1820 | goto out; | |
1821 | ||
1822 | if (!pskb_may_pull(skb, arp_hdr_len(dev))) { | |
1823 | dev->stats.tx_dropped++; | |
1824 | goto out; | |
1825 | } | |
1826 | parp = arp_hdr(skb); | |
1827 | ||
1828 | if ((parp->ar_hrd != htons(ARPHRD_ETHER) && | |
1829 | parp->ar_hrd != htons(ARPHRD_IEEE802)) || | |
1830 | parp->ar_pro != htons(ETH_P_IP) || | |
1831 | parp->ar_op != htons(ARPOP_REQUEST) || | |
1832 | parp->ar_hln != dev->addr_len || | |
1833 | parp->ar_pln != 4) | |
1834 | goto out; | |
1835 | arpptr = (u8 *)parp + sizeof(struct arphdr); | |
1836 | sha = arpptr; | |
1837 | arpptr += dev->addr_len; /* sha */ | |
1838 | memcpy(&sip, arpptr, sizeof(sip)); | |
1839 | arpptr += sizeof(sip); | |
1840 | arpptr += dev->addr_len; /* tha */ | |
1841 | memcpy(&tip, arpptr, sizeof(tip)); | |
1842 | ||
1843 | if (ipv4_is_loopback(tip) || | |
1844 | ipv4_is_multicast(tip)) | |
1845 | goto out; | |
1846 | ||
1847 | n = neigh_lookup(&arp_tbl, &tip, dev); | |
1848 | ||
1849 | if (n) { | |
1850 | struct vxlan_fdb *f; | |
1851 | struct sk_buff *reply; | |
1852 | ||
1853 | if (!(n->nud_state & NUD_CONNECTED)) { | |
1854 | neigh_release(n); | |
1855 | goto out; | |
1856 | } | |
1857 | ||
1858 | f = vxlan_find_mac(vxlan, n->ha, vni); | |
1859 | if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) { | |
1860 | /* bridge-local neighbor */ | |
1861 | neigh_release(n); | |
1862 | goto out; | |
1863 | } | |
1864 | ||
1865 | reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha, | |
1866 | n->ha, sha); | |
1867 | ||
1868 | neigh_release(n); | |
1869 | ||
1870 | if (reply == NULL) | |
1871 | goto out; | |
1872 | ||
1873 | skb_reset_mac_header(reply); | |
1874 | __skb_pull(reply, skb_network_offset(reply)); | |
1875 | reply->ip_summed = CHECKSUM_UNNECESSARY; | |
1876 | reply->pkt_type = PACKET_HOST; | |
1877 | ||
1878 | if (netif_rx_ni(reply) == NET_RX_DROP) | |
1879 | dev->stats.rx_dropped++; | |
1880 | } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) { | |
1881 | union vxlan_addr ipa = { | |
1882 | .sin.sin_addr.s_addr = tip, | |
1883 | .sin.sin_family = AF_INET, | |
1884 | }; | |
1885 | ||
1886 | vxlan_ip_miss(dev, &ipa); | |
1887 | } | |
1888 | out: | |
1889 | consume_skb(skb); | |
1890 | return NETDEV_TX_OK; | |
1891 | } | |
1892 | ||
1893 | #if IS_ENABLED(CONFIG_IPV6) | |
1894 | static struct sk_buff *vxlan_na_create(struct sk_buff *request, | |
1895 | struct neighbour *n, bool isrouter) | |
1896 | { | |
1897 | struct net_device *dev = request->dev; | |
1898 | struct sk_buff *reply; | |
1899 | struct nd_msg *ns, *na; | |
1900 | struct ipv6hdr *pip6; | |
1901 | u8 *daddr; | |
1902 | int na_olen = 8; /* opt hdr + ETH_ALEN for target */ | |
1903 | int ns_olen; | |
1904 | int i, len; | |
1905 | ||
1906 | if (dev == NULL || !pskb_may_pull(request, request->len)) | |
1907 | return NULL; | |
1908 | ||
1909 | len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) + | |
1910 | sizeof(*na) + na_olen + dev->needed_tailroom; | |
1911 | reply = alloc_skb(len, GFP_ATOMIC); | |
1912 | if (reply == NULL) | |
1913 | return NULL; | |
1914 | ||
1915 | reply->protocol = htons(ETH_P_IPV6); | |
1916 | reply->dev = dev; | |
1917 | skb_reserve(reply, LL_RESERVED_SPACE(request->dev)); | |
1918 | skb_push(reply, sizeof(struct ethhdr)); | |
1919 | skb_reset_mac_header(reply); | |
1920 | ||
1921 | ns = (struct nd_msg *)(ipv6_hdr(request) + 1); | |
1922 | ||
1923 | daddr = eth_hdr(request)->h_source; | |
1924 | ns_olen = request->len - skb_network_offset(request) - | |
1925 | sizeof(struct ipv6hdr) - sizeof(*ns); | |
1926 | for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) { | |
1927 | if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) { | |
1928 | daddr = ns->opt + i + sizeof(struct nd_opt_hdr); | |
1929 | break; | |
1930 | } | |
1931 | } | |
1932 | ||
1933 | /* Ethernet header */ | |
1934 | ether_addr_copy(eth_hdr(reply)->h_dest, daddr); | |
1935 | ether_addr_copy(eth_hdr(reply)->h_source, n->ha); | |
1936 | eth_hdr(reply)->h_proto = htons(ETH_P_IPV6); | |
1937 | reply->protocol = htons(ETH_P_IPV6); | |
1938 | ||
1939 | skb_pull(reply, sizeof(struct ethhdr)); | |
1940 | skb_reset_network_header(reply); | |
1941 | skb_put(reply, sizeof(struct ipv6hdr)); | |
1942 | ||
1943 | /* IPv6 header */ | |
1944 | ||
1945 | pip6 = ipv6_hdr(reply); | |
1946 | memset(pip6, 0, sizeof(struct ipv6hdr)); | |
1947 | pip6->version = 6; | |
1948 | pip6->priority = ipv6_hdr(request)->priority; | |
1949 | pip6->nexthdr = IPPROTO_ICMPV6; | |
1950 | pip6->hop_limit = 255; | |
1951 | pip6->daddr = ipv6_hdr(request)->saddr; | |
1952 | pip6->saddr = *(struct in6_addr *)n->primary_key; | |
1953 | ||
1954 | skb_pull(reply, sizeof(struct ipv6hdr)); | |
1955 | skb_reset_transport_header(reply); | |
1956 | ||
1957 | /* Neighbor Advertisement */ | |
1958 | na = skb_put_zero(reply, sizeof(*na) + na_olen); | |
1959 | na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT; | |
1960 | na->icmph.icmp6_router = isrouter; | |
1961 | na->icmph.icmp6_override = 1; | |
1962 | na->icmph.icmp6_solicited = 1; | |
1963 | na->target = ns->target; | |
1964 | ether_addr_copy(&na->opt[2], n->ha); | |
1965 | na->opt[0] = ND_OPT_TARGET_LL_ADDR; | |
1966 | na->opt[1] = na_olen >> 3; | |
1967 | ||
1968 | na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr, | |
1969 | &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6, | |
1970 | csum_partial(na, sizeof(*na)+na_olen, 0)); | |
1971 | ||
1972 | pip6->payload_len = htons(sizeof(*na)+na_olen); | |
1973 | ||
1974 | skb_push(reply, sizeof(struct ipv6hdr)); | |
1975 | ||
1976 | reply->ip_summed = CHECKSUM_UNNECESSARY; | |
1977 | ||
1978 | return reply; | |
1979 | } | |
1980 | ||
1981 | static int neigh_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni) | |
1982 | { | |
1983 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1984 | const struct in6_addr *daddr; | |
1985 | const struct ipv6hdr *iphdr; | |
1986 | struct inet6_dev *in6_dev; | |
1987 | struct neighbour *n; | |
1988 | struct nd_msg *msg; | |
1989 | ||
1990 | in6_dev = __in6_dev_get(dev); | |
1991 | if (!in6_dev) | |
1992 | goto out; | |
1993 | ||
1994 | iphdr = ipv6_hdr(skb); | |
1995 | daddr = &iphdr->daddr; | |
1996 | msg = (struct nd_msg *)(iphdr + 1); | |
1997 | ||
1998 | if (ipv6_addr_loopback(daddr) || | |
1999 | ipv6_addr_is_multicast(&msg->target)) | |
2000 | goto out; | |
2001 | ||
2002 | n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev); | |
2003 | ||
2004 | if (n) { | |
2005 | struct vxlan_fdb *f; | |
2006 | struct sk_buff *reply; | |
2007 | ||
2008 | if (!(n->nud_state & NUD_CONNECTED)) { | |
2009 | neigh_release(n); | |
2010 | goto out; | |
2011 | } | |
2012 | ||
2013 | f = vxlan_find_mac(vxlan, n->ha, vni); | |
2014 | if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) { | |
2015 | /* bridge-local neighbor */ | |
2016 | neigh_release(n); | |
2017 | goto out; | |
2018 | } | |
2019 | ||
2020 | reply = vxlan_na_create(skb, n, | |
2021 | !!(f ? f->flags & NTF_ROUTER : 0)); | |
2022 | ||
2023 | neigh_release(n); | |
2024 | ||
2025 | if (reply == NULL) | |
2026 | goto out; | |
2027 | ||
2028 | if (netif_rx_ni(reply) == NET_RX_DROP) | |
2029 | dev->stats.rx_dropped++; | |
2030 | ||
2031 | } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) { | |
2032 | union vxlan_addr ipa = { | |
2033 | .sin6.sin6_addr = msg->target, | |
2034 | .sin6.sin6_family = AF_INET6, | |
2035 | }; | |
2036 | ||
2037 | vxlan_ip_miss(dev, &ipa); | |
2038 | } | |
2039 | ||
2040 | out: | |
2041 | consume_skb(skb); | |
2042 | return NETDEV_TX_OK; | |
2043 | } | |
2044 | #endif | |
2045 | ||
2046 | static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb) | |
2047 | { | |
2048 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
2049 | struct neighbour *n; | |
2050 | ||
2051 | if (is_multicast_ether_addr(eth_hdr(skb)->h_dest)) | |
2052 | return false; | |
2053 | ||
2054 | n = NULL; | |
2055 | switch (ntohs(eth_hdr(skb)->h_proto)) { | |
2056 | case ETH_P_IP: | |
2057 | { | |
2058 | struct iphdr *pip; | |
2059 | ||
2060 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
2061 | return false; | |
2062 | pip = ip_hdr(skb); | |
2063 | n = neigh_lookup(&arp_tbl, &pip->daddr, dev); | |
2064 | if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) { | |
2065 | union vxlan_addr ipa = { | |
2066 | .sin.sin_addr.s_addr = pip->daddr, | |
2067 | .sin.sin_family = AF_INET, | |
2068 | }; | |
2069 | ||
2070 | vxlan_ip_miss(dev, &ipa); | |
2071 | return false; | |
2072 | } | |
2073 | ||
2074 | break; | |
2075 | } | |
2076 | #if IS_ENABLED(CONFIG_IPV6) | |
2077 | case ETH_P_IPV6: | |
2078 | { | |
2079 | struct ipv6hdr *pip6; | |
2080 | ||
2081 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
2082 | return false; | |
2083 | pip6 = ipv6_hdr(skb); | |
2084 | n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev); | |
2085 | if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) { | |
2086 | union vxlan_addr ipa = { | |
2087 | .sin6.sin6_addr = pip6->daddr, | |
2088 | .sin6.sin6_family = AF_INET6, | |
2089 | }; | |
2090 | ||
2091 | vxlan_ip_miss(dev, &ipa); | |
2092 | return false; | |
2093 | } | |
2094 | ||
2095 | break; | |
2096 | } | |
2097 | #endif | |
2098 | default: | |
2099 | return false; | |
2100 | } | |
2101 | ||
2102 | if (n) { | |
2103 | bool diff; | |
2104 | ||
2105 | diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha); | |
2106 | if (diff) { | |
2107 | memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest, | |
2108 | dev->addr_len); | |
2109 | memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len); | |
2110 | } | |
2111 | neigh_release(n); | |
2112 | return diff; | |
2113 | } | |
2114 | ||
2115 | return false; | |
2116 | } | |
2117 | ||
2118 | static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags, | |
2119 | struct vxlan_metadata *md) | |
2120 | { | |
2121 | struct vxlanhdr_gbp *gbp; | |
2122 | ||
2123 | if (!md->gbp) | |
2124 | return; | |
2125 | ||
2126 | gbp = (struct vxlanhdr_gbp *)vxh; | |
2127 | vxh->vx_flags |= VXLAN_HF_GBP; | |
2128 | ||
2129 | if (md->gbp & VXLAN_GBP_DONT_LEARN) | |
2130 | gbp->dont_learn = 1; | |
2131 | ||
2132 | if (md->gbp & VXLAN_GBP_POLICY_APPLIED) | |
2133 | gbp->policy_applied = 1; | |
2134 | ||
2135 | gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK); | |
2136 | } | |
2137 | ||
2138 | static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, u32 vxflags, | |
2139 | __be16 protocol) | |
2140 | { | |
2141 | struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh; | |
2142 | ||
2143 | gpe->np_applied = 1; | |
2144 | gpe->next_protocol = tun_p_from_eth_p(protocol); | |
2145 | if (!gpe->next_protocol) | |
2146 | return -EPFNOSUPPORT; | |
2147 | return 0; | |
2148 | } | |
2149 | ||
2150 | static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst, | |
2151 | int iphdr_len, __be32 vni, | |
2152 | struct vxlan_metadata *md, u32 vxflags, | |
2153 | bool udp_sum) | |
2154 | { | |
2155 | struct vxlanhdr *vxh; | |
2156 | int min_headroom; | |
2157 | int err; | |
2158 | int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL; | |
2159 | __be16 inner_protocol = htons(ETH_P_TEB); | |
2160 | ||
2161 | if ((vxflags & VXLAN_F_REMCSUM_TX) && | |
2162 | skb->ip_summed == CHECKSUM_PARTIAL) { | |
2163 | int csum_start = skb_checksum_start_offset(skb); | |
2164 | ||
2165 | if (csum_start <= VXLAN_MAX_REMCSUM_START && | |
2166 | !(csum_start & VXLAN_RCO_SHIFT_MASK) && | |
2167 | (skb->csum_offset == offsetof(struct udphdr, check) || | |
2168 | skb->csum_offset == offsetof(struct tcphdr, check))) | |
2169 | type |= SKB_GSO_TUNNEL_REMCSUM; | |
2170 | } | |
2171 | ||
2172 | min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len | |
2173 | + VXLAN_HLEN + iphdr_len; | |
2174 | ||
2175 | /* Need space for new headers (invalidates iph ptr) */ | |
2176 | err = skb_cow_head(skb, min_headroom); | |
2177 | if (unlikely(err)) | |
2178 | return err; | |
2179 | ||
2180 | err = iptunnel_handle_offloads(skb, type); | |
2181 | if (err) | |
2182 | return err; | |
2183 | ||
2184 | vxh = __skb_push(skb, sizeof(*vxh)); | |
2185 | vxh->vx_flags = VXLAN_HF_VNI; | |
2186 | vxh->vx_vni = vxlan_vni_field(vni); | |
2187 | ||
2188 | if (type & SKB_GSO_TUNNEL_REMCSUM) { | |
2189 | unsigned int start; | |
2190 | ||
2191 | start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr); | |
2192 | vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset); | |
2193 | vxh->vx_flags |= VXLAN_HF_RCO; | |
2194 | ||
2195 | if (!skb_is_gso(skb)) { | |
2196 | skb->ip_summed = CHECKSUM_NONE; | |
2197 | skb->encapsulation = 0; | |
2198 | } | |
2199 | } | |
2200 | ||
2201 | if (vxflags & VXLAN_F_GBP) | |
2202 | vxlan_build_gbp_hdr(vxh, vxflags, md); | |
2203 | if (vxflags & VXLAN_F_GPE) { | |
2204 | err = vxlan_build_gpe_hdr(vxh, vxflags, skb->protocol); | |
2205 | if (err < 0) | |
2206 | return err; | |
2207 | inner_protocol = skb->protocol; | |
2208 | } | |
2209 | ||
2210 | skb_set_inner_protocol(skb, inner_protocol); | |
2211 | return 0; | |
2212 | } | |
2213 | ||
2214 | static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan, struct net_device *dev, | |
2215 | struct vxlan_sock *sock4, | |
2216 | struct sk_buff *skb, int oif, u8 tos, | |
2217 | __be32 daddr, __be32 *saddr, __be16 dport, __be16 sport, | |
2218 | struct dst_cache *dst_cache, | |
2219 | const struct ip_tunnel_info *info) | |
2220 | { | |
2221 | bool use_cache = ip_tunnel_dst_cache_usable(skb, info); | |
2222 | struct rtable *rt = NULL; | |
2223 | struct flowi4 fl4; | |
2224 | ||
2225 | if (!sock4) | |
2226 | return ERR_PTR(-EIO); | |
2227 | ||
2228 | if (tos && !info) | |
2229 | use_cache = false; | |
2230 | if (use_cache) { | |
2231 | rt = dst_cache_get_ip4(dst_cache, saddr); | |
2232 | if (rt) | |
2233 | return rt; | |
2234 | } | |
2235 | ||
2236 | memset(&fl4, 0, sizeof(fl4)); | |
2237 | fl4.flowi4_oif = oif; | |
2238 | fl4.flowi4_tos = RT_TOS(tos); | |
2239 | fl4.flowi4_mark = skb->mark; | |
2240 | fl4.flowi4_proto = IPPROTO_UDP; | |
2241 | fl4.daddr = daddr; | |
2242 | fl4.saddr = *saddr; | |
2243 | fl4.fl4_dport = dport; | |
2244 | fl4.fl4_sport = sport; | |
2245 | ||
2246 | rt = ip_route_output_key(vxlan->net, &fl4); | |
2247 | if (!IS_ERR(rt)) { | |
2248 | if (rt->dst.dev == dev) { | |
2249 | netdev_dbg(dev, "circular route to %pI4\n", &daddr); | |
2250 | ip_rt_put(rt); | |
2251 | return ERR_PTR(-ELOOP); | |
2252 | } | |
2253 | ||
2254 | *saddr = fl4.saddr; | |
2255 | if (use_cache) | |
2256 | dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr); | |
2257 | } else { | |
2258 | netdev_dbg(dev, "no route to %pI4\n", &daddr); | |
2259 | return ERR_PTR(-ENETUNREACH); | |
2260 | } | |
2261 | return rt; | |
2262 | } | |
2263 | ||
2264 | #if IS_ENABLED(CONFIG_IPV6) | |
2265 | static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan, | |
2266 | struct net_device *dev, | |
2267 | struct vxlan_sock *sock6, | |
2268 | struct sk_buff *skb, int oif, u8 tos, | |
2269 | __be32 label, | |
2270 | const struct in6_addr *daddr, | |
2271 | struct in6_addr *saddr, | |
2272 | __be16 dport, __be16 sport, | |
2273 | struct dst_cache *dst_cache, | |
2274 | const struct ip_tunnel_info *info) | |
2275 | { | |
2276 | bool use_cache = ip_tunnel_dst_cache_usable(skb, info); | |
2277 | struct dst_entry *ndst; | |
2278 | struct flowi6 fl6; | |
2279 | int err; | |
2280 | ||
2281 | if (!sock6) | |
2282 | return ERR_PTR(-EIO); | |
2283 | ||
2284 | if (tos && !info) | |
2285 | use_cache = false; | |
2286 | if (use_cache) { | |
2287 | ndst = dst_cache_get_ip6(dst_cache, saddr); | |
2288 | if (ndst) | |
2289 | return ndst; | |
2290 | } | |
2291 | ||
2292 | memset(&fl6, 0, sizeof(fl6)); | |
2293 | fl6.flowi6_oif = oif; | |
2294 | fl6.daddr = *daddr; | |
2295 | fl6.saddr = *saddr; | |
2296 | fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tos), label); | |
2297 | fl6.flowi6_mark = skb->mark; | |
2298 | fl6.flowi6_proto = IPPROTO_UDP; | |
2299 | fl6.fl6_dport = dport; | |
2300 | fl6.fl6_sport = sport; | |
2301 | ||
2302 | err = ipv6_stub->ipv6_dst_lookup(vxlan->net, | |
2303 | sock6->sock->sk, | |
2304 | &ndst, &fl6); | |
2305 | if (unlikely(err < 0)) { | |
2306 | netdev_dbg(dev, "no route to %pI6\n", daddr); | |
2307 | return ERR_PTR(-ENETUNREACH); | |
2308 | } | |
2309 | ||
2310 | if (unlikely(ndst->dev == dev)) { | |
2311 | netdev_dbg(dev, "circular route to %pI6\n", daddr); | |
2312 | dst_release(ndst); | |
2313 | return ERR_PTR(-ELOOP); | |
2314 | } | |
2315 | ||
2316 | *saddr = fl6.saddr; | |
2317 | if (use_cache) | |
2318 | dst_cache_set_ip6(dst_cache, ndst, saddr); | |
2319 | return ndst; | |
2320 | } | |
2321 | #endif | |
2322 | ||
2323 | /* Bypass encapsulation if the destination is local */ | |
2324 | static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan, | |
2325 | struct vxlan_dev *dst_vxlan, __be32 vni) | |
2326 | { | |
2327 | struct pcpu_sw_netstats *tx_stats, *rx_stats; | |
2328 | union vxlan_addr loopback; | |
2329 | union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip; | |
2330 | struct net_device *dev; | |
2331 | int len = skb->len; | |
2332 | ||
2333 | tx_stats = this_cpu_ptr(src_vxlan->dev->tstats); | |
2334 | rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats); | |
2335 | skb->pkt_type = PACKET_HOST; | |
2336 | skb->encapsulation = 0; | |
2337 | skb->dev = dst_vxlan->dev; | |
2338 | __skb_pull(skb, skb_network_offset(skb)); | |
2339 | ||
2340 | if (remote_ip->sa.sa_family == AF_INET) { | |
2341 | loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK); | |
2342 | loopback.sa.sa_family = AF_INET; | |
2343 | #if IS_ENABLED(CONFIG_IPV6) | |
2344 | } else { | |
2345 | loopback.sin6.sin6_addr = in6addr_loopback; | |
2346 | loopback.sa.sa_family = AF_INET6; | |
2347 | #endif | |
2348 | } | |
2349 | ||
2350 | rcu_read_lock(); | |
2351 | dev = skb->dev; | |
2352 | if (unlikely(!(dev->flags & IFF_UP))) { | |
2353 | kfree_skb(skb); | |
2354 | goto drop; | |
2355 | } | |
2356 | ||
2357 | if (dst_vxlan->cfg.flags & VXLAN_F_LEARN) | |
2358 | vxlan_snoop(dev, &loopback, eth_hdr(skb)->h_source, 0, vni); | |
2359 | ||
2360 | u64_stats_update_begin(&tx_stats->syncp); | |
2361 | tx_stats->tx_packets++; | |
2362 | tx_stats->tx_bytes += len; | |
2363 | u64_stats_update_end(&tx_stats->syncp); | |
2364 | ||
2365 | if (netif_rx(skb) == NET_RX_SUCCESS) { | |
2366 | u64_stats_update_begin(&rx_stats->syncp); | |
2367 | rx_stats->rx_packets++; | |
2368 | rx_stats->rx_bytes += len; | |
2369 | u64_stats_update_end(&rx_stats->syncp); | |
2370 | } else { | |
2371 | drop: | |
2372 | dev->stats.rx_dropped++; | |
2373 | } | |
2374 | rcu_read_unlock(); | |
2375 | } | |
2376 | ||
2377 | static int encap_bypass_if_local(struct sk_buff *skb, struct net_device *dev, | |
2378 | struct vxlan_dev *vxlan, | |
2379 | union vxlan_addr *daddr, | |
2380 | __be16 dst_port, int dst_ifindex, __be32 vni, | |
2381 | struct dst_entry *dst, | |
2382 | u32 rt_flags) | |
2383 | { | |
2384 | #if IS_ENABLED(CONFIG_IPV6) | |
2385 | /* IPv6 rt-flags are checked against RTF_LOCAL, but the value of | |
2386 | * RTF_LOCAL is equal to RTCF_LOCAL. So to keep code simple | |
2387 | * we can use RTCF_LOCAL which works for ipv4 and ipv6 route entry. | |
2388 | */ | |
2389 | BUILD_BUG_ON(RTCF_LOCAL != RTF_LOCAL); | |
2390 | #endif | |
2391 | /* Bypass encapsulation if the destination is local */ | |
2392 | if (rt_flags & RTCF_LOCAL && | |
2393 | !(rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) { | |
2394 | struct vxlan_dev *dst_vxlan; | |
2395 | ||
2396 | dst_release(dst); | |
2397 | dst_vxlan = vxlan_find_vni(vxlan->net, dst_ifindex, vni, | |
2398 | daddr->sa.sa_family, dst_port, | |
2399 | vxlan->cfg.flags); | |
2400 | if (!dst_vxlan) { | |
2401 | dev->stats.tx_errors++; | |
2402 | kfree_skb(skb); | |
2403 | ||
2404 | return -ENOENT; | |
2405 | } | |
2406 | vxlan_encap_bypass(skb, vxlan, dst_vxlan, vni); | |
2407 | return 1; | |
2408 | } | |
2409 | ||
2410 | return 0; | |
2411 | } | |
2412 | ||
2413 | static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev, | |
2414 | __be32 default_vni, struct vxlan_rdst *rdst, | |
2415 | bool did_rsc) | |
2416 | { | |
2417 | struct dst_cache *dst_cache; | |
2418 | struct ip_tunnel_info *info; | |
2419 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
2420 | const struct iphdr *old_iph = ip_hdr(skb); | |
2421 | union vxlan_addr *dst; | |
2422 | union vxlan_addr remote_ip, local_ip; | |
2423 | struct vxlan_metadata _md; | |
2424 | struct vxlan_metadata *md = &_md; | |
2425 | __be16 src_port = 0, dst_port; | |
2426 | struct dst_entry *ndst = NULL; | |
2427 | __be32 vni, label; | |
2428 | __u8 tos, ttl; | |
2429 | int ifindex; | |
2430 | int err; | |
2431 | u32 flags = vxlan->cfg.flags; | |
2432 | bool udp_sum = false; | |
2433 | bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev)); | |
2434 | ||
2435 | info = skb_tunnel_info(skb); | |
2436 | ||
2437 | if (rdst) { | |
2438 | dst = &rdst->remote_ip; | |
2439 | if (vxlan_addr_any(dst)) { | |
2440 | if (did_rsc) { | |
2441 | /* short-circuited back to local bridge */ | |
2442 | vxlan_encap_bypass(skb, vxlan, vxlan, default_vni); | |
2443 | return; | |
2444 | } | |
2445 | goto drop; | |
2446 | } | |
2447 | ||
2448 | dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port; | |
2449 | vni = (rdst->remote_vni) ? : default_vni; | |
2450 | ifindex = rdst->remote_ifindex; | |
2451 | local_ip = vxlan->cfg.saddr; | |
2452 | dst_cache = &rdst->dst_cache; | |
2453 | md->gbp = skb->mark; | |
2454 | if (flags & VXLAN_F_TTL_INHERIT) { | |
2455 | ttl = ip_tunnel_get_ttl(old_iph, skb); | |
2456 | } else { | |
2457 | ttl = vxlan->cfg.ttl; | |
2458 | if (!ttl && vxlan_addr_multicast(dst)) | |
2459 | ttl = 1; | |
2460 | } | |
2461 | ||
2462 | tos = vxlan->cfg.tos; | |
2463 | if (tos == 1) | |
2464 | tos = ip_tunnel_get_dsfield(old_iph, skb); | |
2465 | ||
2466 | if (dst->sa.sa_family == AF_INET) | |
2467 | udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX); | |
2468 | else | |
2469 | udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX); | |
2470 | label = vxlan->cfg.label; | |
2471 | } else { | |
2472 | if (!info) { | |
2473 | WARN_ONCE(1, "%s: Missing encapsulation instructions\n", | |
2474 | dev->name); | |
2475 | goto drop; | |
2476 | } | |
2477 | remote_ip.sa.sa_family = ip_tunnel_info_af(info); | |
2478 | if (remote_ip.sa.sa_family == AF_INET) { | |
2479 | remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst; | |
2480 | local_ip.sin.sin_addr.s_addr = info->key.u.ipv4.src; | |
2481 | } else { | |
2482 | remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst; | |
2483 | local_ip.sin6.sin6_addr = info->key.u.ipv6.src; | |
2484 | } | |
2485 | dst = &remote_ip; | |
2486 | dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port; | |
2487 | vni = tunnel_id_to_key32(info->key.tun_id); | |
2488 | ifindex = 0; | |
2489 | dst_cache = &info->dst_cache; | |
2490 | if (info->key.tun_flags & TUNNEL_VXLAN_OPT) { | |
2491 | if (info->options_len < sizeof(*md)) | |
2492 | goto drop; | |
2493 | md = ip_tunnel_info_opts(info); | |
2494 | } | |
2495 | ttl = info->key.ttl; | |
2496 | tos = info->key.tos; | |
2497 | label = info->key.label; | |
2498 | udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM); | |
2499 | } | |
2500 | src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min, | |
2501 | vxlan->cfg.port_max, true); | |
2502 | ||
2503 | rcu_read_lock(); | |
2504 | if (dst->sa.sa_family == AF_INET) { | |
2505 | struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock); | |
2506 | struct rtable *rt; | |
2507 | __be16 df = 0; | |
2508 | ||
2509 | if (!ifindex) | |
2510 | ifindex = sock4->sock->sk->sk_bound_dev_if; | |
2511 | ||
2512 | rt = vxlan_get_route(vxlan, dev, sock4, skb, ifindex, tos, | |
2513 | dst->sin.sin_addr.s_addr, | |
2514 | &local_ip.sin.sin_addr.s_addr, | |
2515 | dst_port, src_port, | |
2516 | dst_cache, info); | |
2517 | if (IS_ERR(rt)) { | |
2518 | err = PTR_ERR(rt); | |
2519 | goto tx_error; | |
2520 | } | |
2521 | ||
2522 | if (!info) { | |
2523 | /* Bypass encapsulation if the destination is local */ | |
2524 | err = encap_bypass_if_local(skb, dev, vxlan, dst, | |
2525 | dst_port, ifindex, vni, | |
2526 | &rt->dst, rt->rt_flags); | |
2527 | if (err) | |
2528 | goto out_unlock; | |
2529 | ||
2530 | if (vxlan->cfg.df == VXLAN_DF_SET) { | |
2531 | df = htons(IP_DF); | |
2532 | } else if (vxlan->cfg.df == VXLAN_DF_INHERIT) { | |
2533 | struct ethhdr *eth = eth_hdr(skb); | |
2534 | ||
2535 | if (ntohs(eth->h_proto) == ETH_P_IPV6 || | |
2536 | (ntohs(eth->h_proto) == ETH_P_IP && | |
2537 | old_iph->frag_off & htons(IP_DF))) | |
2538 | df = htons(IP_DF); | |
2539 | } | |
2540 | } else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT) { | |
2541 | df = htons(IP_DF); | |
2542 | } | |
2543 | ||
2544 | ndst = &rt->dst; | |
2545 | skb_tunnel_check_pmtu(skb, ndst, VXLAN_HEADROOM); | |
2546 | ||
2547 | tos = ip_tunnel_ecn_encap(tos, old_iph, skb); | |
2548 | ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); | |
2549 | err = vxlan_build_skb(skb, ndst, sizeof(struct iphdr), | |
2550 | vni, md, flags, udp_sum); | |
2551 | if (err < 0) | |
2552 | goto tx_error; | |
2553 | ||
2554 | udp_tunnel_xmit_skb(rt, sock4->sock->sk, skb, local_ip.sin.sin_addr.s_addr, | |
2555 | dst->sin.sin_addr.s_addr, tos, ttl, df, | |
2556 | src_port, dst_port, xnet, !udp_sum); | |
2557 | #if IS_ENABLED(CONFIG_IPV6) | |
2558 | } else { | |
2559 | struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock); | |
2560 | ||
2561 | if (!ifindex) | |
2562 | ifindex = sock6->sock->sk->sk_bound_dev_if; | |
2563 | ||
2564 | ndst = vxlan6_get_route(vxlan, dev, sock6, skb, ifindex, tos, | |
2565 | label, &dst->sin6.sin6_addr, | |
2566 | &local_ip.sin6.sin6_addr, | |
2567 | dst_port, src_port, | |
2568 | dst_cache, info); | |
2569 | if (IS_ERR(ndst)) { | |
2570 | err = PTR_ERR(ndst); | |
2571 | ndst = NULL; | |
2572 | goto tx_error; | |
2573 | } | |
2574 | ||
2575 | if (!info) { | |
2576 | u32 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags; | |
2577 | ||
2578 | err = encap_bypass_if_local(skb, dev, vxlan, dst, | |
2579 | dst_port, ifindex, vni, | |
2580 | ndst, rt6i_flags); | |
2581 | if (err) | |
2582 | goto out_unlock; | |
2583 | } | |
2584 | ||
2585 | skb_tunnel_check_pmtu(skb, ndst, VXLAN6_HEADROOM); | |
2586 | ||
2587 | tos = ip_tunnel_ecn_encap(tos, old_iph, skb); | |
2588 | ttl = ttl ? : ip6_dst_hoplimit(ndst); | |
2589 | skb_scrub_packet(skb, xnet); | |
2590 | err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr), | |
2591 | vni, md, flags, udp_sum); | |
2592 | if (err < 0) | |
2593 | goto tx_error; | |
2594 | ||
2595 | udp_tunnel6_xmit_skb(ndst, sock6->sock->sk, skb, dev, | |
2596 | &local_ip.sin6.sin6_addr, | |
2597 | &dst->sin6.sin6_addr, tos, ttl, | |
2598 | label, src_port, dst_port, !udp_sum); | |
2599 | #endif | |
2600 | } | |
2601 | out_unlock: | |
2602 | rcu_read_unlock(); | |
2603 | return; | |
2604 | ||
2605 | drop: | |
2606 | dev->stats.tx_dropped++; | |
2607 | dev_kfree_skb(skb); | |
2608 | return; | |
2609 | ||
2610 | tx_error: | |
2611 | rcu_read_unlock(); | |
2612 | if (err == -ELOOP) | |
2613 | dev->stats.collisions++; | |
2614 | else if (err == -ENETUNREACH) | |
2615 | dev->stats.tx_carrier_errors++; | |
2616 | dst_release(ndst); | |
2617 | dev->stats.tx_errors++; | |
2618 | kfree_skb(skb); | |
2619 | } | |
2620 | ||
2621 | /* Transmit local packets over Vxlan | |
2622 | * | |
2623 | * Outer IP header inherits ECN and DF from inner header. | |
2624 | * Outer UDP destination is the VXLAN assigned port. | |
2625 | * source port is based on hash of flow | |
2626 | */ | |
2627 | static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev) | |
2628 | { | |
2629 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
2630 | struct vxlan_rdst *rdst, *fdst = NULL; | |
2631 | const struct ip_tunnel_info *info; | |
2632 | bool did_rsc = false; | |
2633 | struct vxlan_fdb *f; | |
2634 | struct ethhdr *eth; | |
2635 | __be32 vni = 0; | |
2636 | ||
2637 | info = skb_tunnel_info(skb); | |
2638 | ||
2639 | skb_reset_mac_header(skb); | |
2640 | ||
2641 | if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) { | |
2642 | if (info && info->mode & IP_TUNNEL_INFO_BRIDGE && | |
2643 | info->mode & IP_TUNNEL_INFO_TX) { | |
2644 | vni = tunnel_id_to_key32(info->key.tun_id); | |
2645 | } else { | |
2646 | if (info && info->mode & IP_TUNNEL_INFO_TX) | |
2647 | vxlan_xmit_one(skb, dev, vni, NULL, false); | |
2648 | else | |
2649 | kfree_skb(skb); | |
2650 | return NETDEV_TX_OK; | |
2651 | } | |
2652 | } | |
2653 | ||
2654 | if (vxlan->cfg.flags & VXLAN_F_PROXY) { | |
2655 | eth = eth_hdr(skb); | |
2656 | if (ntohs(eth->h_proto) == ETH_P_ARP) | |
2657 | return arp_reduce(dev, skb, vni); | |
2658 | #if IS_ENABLED(CONFIG_IPV6) | |
2659 | else if (ntohs(eth->h_proto) == ETH_P_IPV6 && | |
2660 | pskb_may_pull(skb, sizeof(struct ipv6hdr) + | |
2661 | sizeof(struct nd_msg)) && | |
2662 | ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) { | |
2663 | struct nd_msg *m = (struct nd_msg *)(ipv6_hdr(skb) + 1); | |
2664 | ||
2665 | if (m->icmph.icmp6_code == 0 && | |
2666 | m->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) | |
2667 | return neigh_reduce(dev, skb, vni); | |
2668 | } | |
2669 | #endif | |
2670 | } | |
2671 | ||
2672 | eth = eth_hdr(skb); | |
2673 | f = vxlan_find_mac(vxlan, eth->h_dest, vni); | |
2674 | did_rsc = false; | |
2675 | ||
2676 | if (f && (f->flags & NTF_ROUTER) && (vxlan->cfg.flags & VXLAN_F_RSC) && | |
2677 | (ntohs(eth->h_proto) == ETH_P_IP || | |
2678 | ntohs(eth->h_proto) == ETH_P_IPV6)) { | |
2679 | did_rsc = route_shortcircuit(dev, skb); | |
2680 | if (did_rsc) | |
2681 | f = vxlan_find_mac(vxlan, eth->h_dest, vni); | |
2682 | } | |
2683 | ||
2684 | if (f == NULL) { | |
2685 | f = vxlan_find_mac(vxlan, all_zeros_mac, vni); | |
2686 | if (f == NULL) { | |
2687 | if ((vxlan->cfg.flags & VXLAN_F_L2MISS) && | |
2688 | !is_multicast_ether_addr(eth->h_dest)) | |
2689 | vxlan_fdb_miss(vxlan, eth->h_dest); | |
2690 | ||
2691 | dev->stats.tx_dropped++; | |
2692 | kfree_skb(skb); | |
2693 | return NETDEV_TX_OK; | |
2694 | } | |
2695 | } | |
2696 | ||
2697 | list_for_each_entry_rcu(rdst, &f->remotes, list) { | |
2698 | struct sk_buff *skb1; | |
2699 | ||
2700 | if (!fdst) { | |
2701 | fdst = rdst; | |
2702 | continue; | |
2703 | } | |
2704 | skb1 = skb_clone(skb, GFP_ATOMIC); | |
2705 | if (skb1) | |
2706 | vxlan_xmit_one(skb1, dev, vni, rdst, did_rsc); | |
2707 | } | |
2708 | ||
2709 | if (fdst) | |
2710 | vxlan_xmit_one(skb, dev, vni, fdst, did_rsc); | |
2711 | else | |
2712 | kfree_skb(skb); | |
2713 | return NETDEV_TX_OK; | |
2714 | } | |
2715 | ||
2716 | /* Walk the forwarding table and purge stale entries */ | |
2717 | static void vxlan_cleanup(struct timer_list *t) | |
2718 | { | |
2719 | struct vxlan_dev *vxlan = from_timer(vxlan, t, age_timer); | |
2720 | unsigned long next_timer = jiffies + FDB_AGE_INTERVAL; | |
2721 | unsigned int h; | |
2722 | ||
2723 | if (!netif_running(vxlan->dev)) | |
2724 | return; | |
2725 | ||
2726 | for (h = 0; h < FDB_HASH_SIZE; ++h) { | |
2727 | struct hlist_node *p, *n; | |
2728 | ||
2729 | spin_lock(&vxlan->hash_lock[h]); | |
2730 | hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) { | |
2731 | struct vxlan_fdb *f | |
2732 | = container_of(p, struct vxlan_fdb, hlist); | |
2733 | unsigned long timeout; | |
2734 | ||
2735 | if (f->state & (NUD_PERMANENT | NUD_NOARP)) | |
2736 | continue; | |
2737 | ||
2738 | if (f->flags & NTF_EXT_LEARNED) | |
2739 | continue; | |
2740 | ||
2741 | timeout = f->used + vxlan->cfg.age_interval * HZ; | |
2742 | if (time_before_eq(timeout, jiffies)) { | |
2743 | netdev_dbg(vxlan->dev, | |
2744 | "garbage collect %pM\n", | |
2745 | f->eth_addr); | |
2746 | f->state = NUD_STALE; | |
2747 | vxlan_fdb_destroy(vxlan, f, true, true); | |
2748 | } else if (time_before(timeout, next_timer)) | |
2749 | next_timer = timeout; | |
2750 | } | |
2751 | spin_unlock(&vxlan->hash_lock[h]); | |
2752 | } | |
2753 | ||
2754 | mod_timer(&vxlan->age_timer, next_timer); | |
2755 | } | |
2756 | ||
2757 | static void vxlan_vs_del_dev(struct vxlan_dev *vxlan) | |
2758 | { | |
2759 | struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id); | |
2760 | ||
2761 | spin_lock(&vn->sock_lock); | |
2762 | hlist_del_init_rcu(&vxlan->hlist4.hlist); | |
2763 | #if IS_ENABLED(CONFIG_IPV6) | |
2764 | hlist_del_init_rcu(&vxlan->hlist6.hlist); | |
2765 | #endif | |
2766 | spin_unlock(&vn->sock_lock); | |
2767 | } | |
2768 | ||
2769 | static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan, | |
2770 | struct vxlan_dev_node *node) | |
2771 | { | |
2772 | struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id); | |
2773 | __be32 vni = vxlan->default_dst.remote_vni; | |
2774 | ||
2775 | node->vxlan = vxlan; | |
2776 | spin_lock(&vn->sock_lock); | |
2777 | hlist_add_head_rcu(&node->hlist, vni_head(vs, vni)); | |
2778 | spin_unlock(&vn->sock_lock); | |
2779 | } | |
2780 | ||
2781 | /* Setup stats when device is created */ | |
2782 | static int vxlan_init(struct net_device *dev) | |
2783 | { | |
2784 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); | |
2785 | if (!dev->tstats) | |
2786 | return -ENOMEM; | |
2787 | ||
2788 | return 0; | |
2789 | } | |
2790 | ||
2791 | static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan, __be32 vni) | |
2792 | { | |
2793 | struct vxlan_fdb *f; | |
2794 | u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, vni); | |
2795 | ||
2796 | spin_lock_bh(&vxlan->hash_lock[hash_index]); | |
2797 | f = __vxlan_find_mac(vxlan, all_zeros_mac, vni); | |
2798 | if (f) | |
2799 | vxlan_fdb_destroy(vxlan, f, true, true); | |
2800 | spin_unlock_bh(&vxlan->hash_lock[hash_index]); | |
2801 | } | |
2802 | ||
2803 | static void vxlan_uninit(struct net_device *dev) | |
2804 | { | |
2805 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
2806 | ||
2807 | gro_cells_destroy(&vxlan->gro_cells); | |
2808 | ||
2809 | vxlan_fdb_delete_default(vxlan, vxlan->cfg.vni); | |
2810 | ||
2811 | free_percpu(dev->tstats); | |
2812 | } | |
2813 | ||
2814 | /* Start ageing timer and join group when device is brought up */ | |
2815 | static int vxlan_open(struct net_device *dev) | |
2816 | { | |
2817 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
2818 | int ret; | |
2819 | ||
2820 | ret = vxlan_sock_add(vxlan); | |
2821 | if (ret < 0) | |
2822 | return ret; | |
2823 | ||
2824 | if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) { | |
2825 | ret = vxlan_igmp_join(vxlan); | |
2826 | if (ret == -EADDRINUSE) | |
2827 | ret = 0; | |
2828 | if (ret) { | |
2829 | vxlan_sock_release(vxlan); | |
2830 | return ret; | |
2831 | } | |
2832 | } | |
2833 | ||
2834 | if (vxlan->cfg.age_interval) | |
2835 | mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL); | |
2836 | ||
2837 | return ret; | |
2838 | } | |
2839 | ||
2840 | /* Purge the forwarding table */ | |
2841 | static void vxlan_flush(struct vxlan_dev *vxlan, bool do_all) | |
2842 | { | |
2843 | unsigned int h; | |
2844 | ||
2845 | for (h = 0; h < FDB_HASH_SIZE; ++h) { | |
2846 | struct hlist_node *p, *n; | |
2847 | ||
2848 | spin_lock_bh(&vxlan->hash_lock[h]); | |
2849 | hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) { | |
2850 | struct vxlan_fdb *f | |
2851 | = container_of(p, struct vxlan_fdb, hlist); | |
2852 | if (!do_all && (f->state & (NUD_PERMANENT | NUD_NOARP))) | |
2853 | continue; | |
2854 | /* the all_zeros_mac entry is deleted at vxlan_uninit */ | |
2855 | if (!is_zero_ether_addr(f->eth_addr)) | |
2856 | vxlan_fdb_destroy(vxlan, f, true, true); | |
2857 | } | |
2858 | spin_unlock_bh(&vxlan->hash_lock[h]); | |
2859 | } | |
2860 | } | |
2861 | ||
2862 | /* Cleanup timer and forwarding table on shutdown */ | |
2863 | static int vxlan_stop(struct net_device *dev) | |
2864 | { | |
2865 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
2866 | struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id); | |
2867 | int ret = 0; | |
2868 | ||
2869 | if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) && | |
2870 | !vxlan_group_used(vn, vxlan)) | |
2871 | ret = vxlan_igmp_leave(vxlan); | |
2872 | ||
2873 | del_timer_sync(&vxlan->age_timer); | |
2874 | ||
2875 | vxlan_flush(vxlan, false); | |
2876 | vxlan_sock_release(vxlan); | |
2877 | ||
2878 | return ret; | |
2879 | } | |
2880 | ||
2881 | /* Stub, nothing needs to be done. */ | |
2882 | static void vxlan_set_multicast_list(struct net_device *dev) | |
2883 | { | |
2884 | } | |
2885 | ||
2886 | static int vxlan_change_mtu(struct net_device *dev, int new_mtu) | |
2887 | { | |
2888 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
2889 | struct vxlan_rdst *dst = &vxlan->default_dst; | |
2890 | struct net_device *lowerdev = __dev_get_by_index(vxlan->net, | |
2891 | dst->remote_ifindex); | |
2892 | bool use_ipv6 = !!(vxlan->cfg.flags & VXLAN_F_IPV6); | |
2893 | ||
2894 | /* This check is different than dev->max_mtu, because it looks at | |
2895 | * the lowerdev->mtu, rather than the static dev->max_mtu | |
2896 | */ | |
2897 | if (lowerdev) { | |
2898 | int max_mtu = lowerdev->mtu - | |
2899 | (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM); | |
2900 | if (new_mtu > max_mtu) | |
2901 | return -EINVAL; | |
2902 | } | |
2903 | ||
2904 | dev->mtu = new_mtu; | |
2905 | return 0; | |
2906 | } | |
2907 | ||
2908 | static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb) | |
2909 | { | |
2910 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
2911 | struct ip_tunnel_info *info = skb_tunnel_info(skb); | |
2912 | __be16 sport, dport; | |
2913 | ||
2914 | sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min, | |
2915 | vxlan->cfg.port_max, true); | |
2916 | dport = info->key.tp_dst ? : vxlan->cfg.dst_port; | |
2917 | ||
2918 | if (ip_tunnel_info_af(info) == AF_INET) { | |
2919 | struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock); | |
2920 | struct rtable *rt; | |
2921 | ||
2922 | rt = vxlan_get_route(vxlan, dev, sock4, skb, 0, info->key.tos, | |
2923 | info->key.u.ipv4.dst, | |
2924 | &info->key.u.ipv4.src, dport, sport, | |
2925 | &info->dst_cache, info); | |
2926 | if (IS_ERR(rt)) | |
2927 | return PTR_ERR(rt); | |
2928 | ip_rt_put(rt); | |
2929 | } else { | |
2930 | #if IS_ENABLED(CONFIG_IPV6) | |
2931 | struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock); | |
2932 | struct dst_entry *ndst; | |
2933 | ||
2934 | ndst = vxlan6_get_route(vxlan, dev, sock6, skb, 0, info->key.tos, | |
2935 | info->key.label, &info->key.u.ipv6.dst, | |
2936 | &info->key.u.ipv6.src, dport, sport, | |
2937 | &info->dst_cache, info); | |
2938 | if (IS_ERR(ndst)) | |
2939 | return PTR_ERR(ndst); | |
2940 | dst_release(ndst); | |
2941 | #else /* !CONFIG_IPV6 */ | |
2942 | return -EPFNOSUPPORT; | |
2943 | #endif | |
2944 | } | |
2945 | info->key.tp_src = sport; | |
2946 | info->key.tp_dst = dport; | |
2947 | return 0; | |
2948 | } | |
2949 | ||
2950 | static const struct net_device_ops vxlan_netdev_ether_ops = { | |
2951 | .ndo_init = vxlan_init, | |
2952 | .ndo_uninit = vxlan_uninit, | |
2953 | .ndo_open = vxlan_open, | |
2954 | .ndo_stop = vxlan_stop, | |
2955 | .ndo_start_xmit = vxlan_xmit, | |
2956 | .ndo_get_stats64 = ip_tunnel_get_stats64, | |
2957 | .ndo_set_rx_mode = vxlan_set_multicast_list, | |
2958 | .ndo_change_mtu = vxlan_change_mtu, | |
2959 | .ndo_validate_addr = eth_validate_addr, | |
2960 | .ndo_set_mac_address = eth_mac_addr, | |
2961 | .ndo_fdb_add = vxlan_fdb_add, | |
2962 | .ndo_fdb_del = vxlan_fdb_delete, | |
2963 | .ndo_fdb_dump = vxlan_fdb_dump, | |
2964 | .ndo_fdb_get = vxlan_fdb_get, | |
2965 | .ndo_fill_metadata_dst = vxlan_fill_metadata_dst, | |
2966 | .ndo_change_proto_down = dev_change_proto_down_generic, | |
2967 | }; | |
2968 | ||
2969 | static const struct net_device_ops vxlan_netdev_raw_ops = { | |
2970 | .ndo_init = vxlan_init, | |
2971 | .ndo_uninit = vxlan_uninit, | |
2972 | .ndo_open = vxlan_open, | |
2973 | .ndo_stop = vxlan_stop, | |
2974 | .ndo_start_xmit = vxlan_xmit, | |
2975 | .ndo_get_stats64 = ip_tunnel_get_stats64, | |
2976 | .ndo_change_mtu = vxlan_change_mtu, | |
2977 | .ndo_fill_metadata_dst = vxlan_fill_metadata_dst, | |
2978 | }; | |
2979 | ||
2980 | /* Info for udev, that this is a virtual tunnel endpoint */ | |
2981 | static struct device_type vxlan_type = { | |
2982 | .name = "vxlan", | |
2983 | }; | |
2984 | ||
2985 | /* Calls the ndo_udp_tunnel_add of the caller in order to | |
2986 | * supply the listening VXLAN udp ports. Callers are expected | |
2987 | * to implement the ndo_udp_tunnel_add. | |
2988 | */ | |
2989 | static void vxlan_offload_rx_ports(struct net_device *dev, bool push) | |
2990 | { | |
2991 | struct vxlan_sock *vs; | |
2992 | struct net *net = dev_net(dev); | |
2993 | struct vxlan_net *vn = net_generic(net, vxlan_net_id); | |
2994 | unsigned int i; | |
2995 | ||
2996 | spin_lock(&vn->sock_lock); | |
2997 | for (i = 0; i < PORT_HASH_SIZE; ++i) { | |
2998 | hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) { | |
2999 | unsigned short type; | |
3000 | ||
3001 | if (vs->flags & VXLAN_F_GPE) | |
3002 | type = UDP_TUNNEL_TYPE_VXLAN_GPE; | |
3003 | else | |
3004 | type = UDP_TUNNEL_TYPE_VXLAN; | |
3005 | ||
3006 | if (push) | |
3007 | udp_tunnel_push_rx_port(dev, vs->sock, type); | |
3008 | else | |
3009 | udp_tunnel_drop_rx_port(dev, vs->sock, type); | |
3010 | } | |
3011 | } | |
3012 | spin_unlock(&vn->sock_lock); | |
3013 | } | |
3014 | ||
3015 | /* Initialize the device structure. */ | |
3016 | static void vxlan_setup(struct net_device *dev) | |
3017 | { | |
3018 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
3019 | unsigned int h; | |
3020 | ||
3021 | eth_hw_addr_random(dev); | |
3022 | ether_setup(dev); | |
3023 | ||
3024 | dev->needs_free_netdev = true; | |
3025 | SET_NETDEV_DEVTYPE(dev, &vxlan_type); | |
3026 | ||
3027 | dev->features |= NETIF_F_LLTX; | |
3028 | dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM; | |
3029 | dev->features |= NETIF_F_RXCSUM; | |
3030 | dev->features |= NETIF_F_GSO_SOFTWARE; | |
3031 | ||
3032 | dev->vlan_features = dev->features; | |
3033 | dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM; | |
3034 | dev->hw_features |= NETIF_F_GSO_SOFTWARE; | |
3035 | netif_keep_dst(dev); | |
3036 | dev->priv_flags |= IFF_NO_QUEUE; | |
3037 | ||
3038 | /* MTU range: 68 - 65535 */ | |
3039 | dev->min_mtu = ETH_MIN_MTU; | |
3040 | dev->max_mtu = ETH_MAX_MTU; | |
3041 | ||
3042 | INIT_LIST_HEAD(&vxlan->next); | |
3043 | ||
3044 | timer_setup(&vxlan->age_timer, vxlan_cleanup, TIMER_DEFERRABLE); | |
3045 | ||
3046 | vxlan->dev = dev; | |
3047 | ||
3048 | gro_cells_init(&vxlan->gro_cells, dev); | |
3049 | ||
3050 | for (h = 0; h < FDB_HASH_SIZE; ++h) { | |
3051 | spin_lock_init(&vxlan->hash_lock[h]); | |
3052 | INIT_HLIST_HEAD(&vxlan->fdb_head[h]); | |
3053 | } | |
3054 | } | |
3055 | ||
3056 | static void vxlan_ether_setup(struct net_device *dev) | |
3057 | { | |
3058 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; | |
3059 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; | |
3060 | dev->netdev_ops = &vxlan_netdev_ether_ops; | |
3061 | } | |
3062 | ||
3063 | static void vxlan_raw_setup(struct net_device *dev) | |
3064 | { | |
3065 | dev->header_ops = NULL; | |
3066 | dev->type = ARPHRD_NONE; | |
3067 | dev->hard_header_len = 0; | |
3068 | dev->addr_len = 0; | |
3069 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; | |
3070 | dev->netdev_ops = &vxlan_netdev_raw_ops; | |
3071 | } | |
3072 | ||
3073 | static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = { | |
3074 | [IFLA_VXLAN_ID] = { .type = NLA_U32 }, | |
3075 | [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) }, | |
3076 | [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) }, | |
3077 | [IFLA_VXLAN_LINK] = { .type = NLA_U32 }, | |
3078 | [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) }, | |
3079 | [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) }, | |
3080 | [IFLA_VXLAN_TOS] = { .type = NLA_U8 }, | |
3081 | [IFLA_VXLAN_TTL] = { .type = NLA_U8 }, | |
3082 | [IFLA_VXLAN_LABEL] = { .type = NLA_U32 }, | |
3083 | [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 }, | |
3084 | [IFLA_VXLAN_AGEING] = { .type = NLA_U32 }, | |
3085 | [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 }, | |
3086 | [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) }, | |
3087 | [IFLA_VXLAN_PROXY] = { .type = NLA_U8 }, | |
3088 | [IFLA_VXLAN_RSC] = { .type = NLA_U8 }, | |
3089 | [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 }, | |
3090 | [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 }, | |
3091 | [IFLA_VXLAN_COLLECT_METADATA] = { .type = NLA_U8 }, | |
3092 | [IFLA_VXLAN_PORT] = { .type = NLA_U16 }, | |
3093 | [IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 }, | |
3094 | [IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 }, | |
3095 | [IFLA_VXLAN_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 }, | |
3096 | [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 }, | |
3097 | [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 }, | |
3098 | [IFLA_VXLAN_GBP] = { .type = NLA_FLAG, }, | |
3099 | [IFLA_VXLAN_GPE] = { .type = NLA_FLAG, }, | |
3100 | [IFLA_VXLAN_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG }, | |
3101 | [IFLA_VXLAN_TTL_INHERIT] = { .type = NLA_FLAG }, | |
3102 | [IFLA_VXLAN_DF] = { .type = NLA_U8 }, | |
3103 | }; | |
3104 | ||
3105 | static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[], | |
3106 | struct netlink_ext_ack *extack) | |
3107 | { | |
3108 | if (tb[IFLA_ADDRESS]) { | |
3109 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { | |
3110 | NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], | |
3111 | "Provided link layer address is not Ethernet"); | |
3112 | return -EINVAL; | |
3113 | } | |
3114 | ||
3115 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { | |
3116 | NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], | |
3117 | "Provided Ethernet address is not unicast"); | |
3118 | return -EADDRNOTAVAIL; | |
3119 | } | |
3120 | } | |
3121 | ||
3122 | if (tb[IFLA_MTU]) { | |
3123 | u32 mtu = nla_get_u32(tb[IFLA_MTU]); | |
3124 | ||
3125 | if (mtu < ETH_MIN_MTU || mtu > ETH_MAX_MTU) { | |
3126 | NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU], | |
3127 | "MTU must be between 68 and 65535"); | |
3128 | return -EINVAL; | |
3129 | } | |
3130 | } | |
3131 | ||
3132 | if (!data) { | |
3133 | NL_SET_ERR_MSG(extack, | |
3134 | "Required attributes not provided to perform the operation"); | |
3135 | return -EINVAL; | |
3136 | } | |
3137 | ||
3138 | if (data[IFLA_VXLAN_ID]) { | |
3139 | u32 id = nla_get_u32(data[IFLA_VXLAN_ID]); | |
3140 | ||
3141 | if (id >= VXLAN_N_VID) { | |
3142 | NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_ID], | |
3143 | "VXLAN ID must be lower than 16777216"); | |
3144 | return -ERANGE; | |
3145 | } | |
3146 | } | |
3147 | ||
3148 | if (data[IFLA_VXLAN_PORT_RANGE]) { | |
3149 | const struct ifla_vxlan_port_range *p | |
3150 | = nla_data(data[IFLA_VXLAN_PORT_RANGE]); | |
3151 | ||
3152 | if (ntohs(p->high) < ntohs(p->low)) { | |
3153 | NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT_RANGE], | |
3154 | "Invalid source port range"); | |
3155 | return -EINVAL; | |
3156 | } | |
3157 | } | |
3158 | ||
3159 | if (data[IFLA_VXLAN_DF]) { | |
3160 | enum ifla_vxlan_df df = nla_get_u8(data[IFLA_VXLAN_DF]); | |
3161 | ||
3162 | if (df < 0 || df > VXLAN_DF_MAX) { | |
3163 | NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_DF], | |
3164 | "Invalid DF attribute"); | |
3165 | return -EINVAL; | |
3166 | } | |
3167 | } | |
3168 | ||
3169 | return 0; | |
3170 | } | |
3171 | ||
3172 | static void vxlan_get_drvinfo(struct net_device *netdev, | |
3173 | struct ethtool_drvinfo *drvinfo) | |
3174 | { | |
3175 | strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version)); | |
3176 | strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver)); | |
3177 | } | |
3178 | ||
3179 | static const struct ethtool_ops vxlan_ethtool_ops = { | |
3180 | .get_drvinfo = vxlan_get_drvinfo, | |
3181 | .get_link = ethtool_op_get_link, | |
3182 | }; | |
3183 | ||
3184 | static struct socket *vxlan_create_sock(struct net *net, bool ipv6, | |
3185 | __be16 port, u32 flags, int ifindex) | |
3186 | { | |
3187 | struct socket *sock; | |
3188 | struct udp_port_cfg udp_conf; | |
3189 | int err; | |
3190 | ||
3191 | memset(&udp_conf, 0, sizeof(udp_conf)); | |
3192 | ||
3193 | if (ipv6) { | |
3194 | udp_conf.family = AF_INET6; | |
3195 | udp_conf.use_udp6_rx_checksums = | |
3196 | !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX); | |
3197 | udp_conf.ipv6_v6only = 1; | |
3198 | } else { | |
3199 | udp_conf.family = AF_INET; | |
3200 | } | |
3201 | ||
3202 | udp_conf.local_udp_port = port; | |
3203 | udp_conf.bind_ifindex = ifindex; | |
3204 | ||
3205 | /* Open UDP socket */ | |
3206 | err = udp_sock_create(net, &udp_conf, &sock); | |
3207 | if (err < 0) | |
3208 | return ERR_PTR(err); | |
3209 | ||
3210 | return sock; | |
3211 | } | |
3212 | ||
3213 | /* Create new listen socket if needed */ | |
3214 | static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6, | |
3215 | __be16 port, u32 flags, | |
3216 | int ifindex) | |
3217 | { | |
3218 | struct vxlan_net *vn = net_generic(net, vxlan_net_id); | |
3219 | struct vxlan_sock *vs; | |
3220 | struct socket *sock; | |
3221 | unsigned int h; | |
3222 | struct udp_tunnel_sock_cfg tunnel_cfg; | |
3223 | ||
3224 | vs = kzalloc(sizeof(*vs), GFP_KERNEL); | |
3225 | if (!vs) | |
3226 | return ERR_PTR(-ENOMEM); | |
3227 | ||
3228 | for (h = 0; h < VNI_HASH_SIZE; ++h) | |
3229 | INIT_HLIST_HEAD(&vs->vni_list[h]); | |
3230 | ||
3231 | sock = vxlan_create_sock(net, ipv6, port, flags, ifindex); | |
3232 | if (IS_ERR(sock)) { | |
3233 | kfree(vs); | |
3234 | return ERR_CAST(sock); | |
3235 | } | |
3236 | ||
3237 | vs->sock = sock; | |
3238 | refcount_set(&vs->refcnt, 1); | |
3239 | vs->flags = (flags & VXLAN_F_RCV_FLAGS); | |
3240 | ||
3241 | spin_lock(&vn->sock_lock); | |
3242 | hlist_add_head_rcu(&vs->hlist, vs_head(net, port)); | |
3243 | udp_tunnel_notify_add_rx_port(sock, | |
3244 | (vs->flags & VXLAN_F_GPE) ? | |
3245 | UDP_TUNNEL_TYPE_VXLAN_GPE : | |
3246 | UDP_TUNNEL_TYPE_VXLAN); | |
3247 | spin_unlock(&vn->sock_lock); | |
3248 | ||
3249 | /* Mark socket as an encapsulation socket. */ | |
3250 | memset(&tunnel_cfg, 0, sizeof(tunnel_cfg)); | |
3251 | tunnel_cfg.sk_user_data = vs; | |
3252 | tunnel_cfg.encap_type = 1; | |
3253 | tunnel_cfg.encap_rcv = vxlan_rcv; | |
3254 | tunnel_cfg.encap_err_lookup = vxlan_err_lookup; | |
3255 | tunnel_cfg.encap_destroy = NULL; | |
3256 | tunnel_cfg.gro_receive = vxlan_gro_receive; | |
3257 | tunnel_cfg.gro_complete = vxlan_gro_complete; | |
3258 | ||
3259 | setup_udp_tunnel_sock(net, sock, &tunnel_cfg); | |
3260 | ||
3261 | return vs; | |
3262 | } | |
3263 | ||
3264 | static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6) | |
3265 | { | |
3266 | struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id); | |
3267 | struct vxlan_sock *vs = NULL; | |
3268 | struct vxlan_dev_node *node; | |
3269 | int l3mdev_index = 0; | |
3270 | ||
3271 | if (vxlan->cfg.remote_ifindex) | |
3272 | l3mdev_index = l3mdev_master_upper_ifindex_by_index( | |
3273 | vxlan->net, vxlan->cfg.remote_ifindex); | |
3274 | ||
3275 | if (!vxlan->cfg.no_share) { | |
3276 | spin_lock(&vn->sock_lock); | |
3277 | vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET, | |
3278 | vxlan->cfg.dst_port, vxlan->cfg.flags, | |
3279 | l3mdev_index); | |
3280 | if (vs && !refcount_inc_not_zero(&vs->refcnt)) { | |
3281 | spin_unlock(&vn->sock_lock); | |
3282 | return -EBUSY; | |
3283 | } | |
3284 | spin_unlock(&vn->sock_lock); | |
3285 | } | |
3286 | if (!vs) | |
3287 | vs = vxlan_socket_create(vxlan->net, ipv6, | |
3288 | vxlan->cfg.dst_port, vxlan->cfg.flags, | |
3289 | l3mdev_index); | |
3290 | if (IS_ERR(vs)) | |
3291 | return PTR_ERR(vs); | |
3292 | #if IS_ENABLED(CONFIG_IPV6) | |
3293 | if (ipv6) { | |
3294 | rcu_assign_pointer(vxlan->vn6_sock, vs); | |
3295 | node = &vxlan->hlist6; | |
3296 | } else | |
3297 | #endif | |
3298 | { | |
3299 | rcu_assign_pointer(vxlan->vn4_sock, vs); | |
3300 | node = &vxlan->hlist4; | |
3301 | } | |
3302 | vxlan_vs_add_dev(vs, vxlan, node); | |
3303 | return 0; | |
3304 | } | |
3305 | ||
3306 | static int vxlan_sock_add(struct vxlan_dev *vxlan) | |
3307 | { | |
3308 | bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA; | |
3309 | bool ipv6 = vxlan->cfg.flags & VXLAN_F_IPV6 || metadata; | |
3310 | bool ipv4 = !ipv6 || metadata; | |
3311 | int ret = 0; | |
3312 | ||
3313 | RCU_INIT_POINTER(vxlan->vn4_sock, NULL); | |
3314 | #if IS_ENABLED(CONFIG_IPV6) | |
3315 | RCU_INIT_POINTER(vxlan->vn6_sock, NULL); | |
3316 | if (ipv6) { | |
3317 | ret = __vxlan_sock_add(vxlan, true); | |
3318 | if (ret < 0 && ret != -EAFNOSUPPORT) | |
3319 | ipv4 = false; | |
3320 | } | |
3321 | #endif | |
3322 | if (ipv4) | |
3323 | ret = __vxlan_sock_add(vxlan, false); | |
3324 | if (ret < 0) | |
3325 | vxlan_sock_release(vxlan); | |
3326 | return ret; | |
3327 | } | |
3328 | ||
3329 | static int vxlan_config_validate(struct net *src_net, struct vxlan_config *conf, | |
3330 | struct net_device **lower, | |
3331 | struct vxlan_dev *old, | |
3332 | struct netlink_ext_ack *extack) | |
3333 | { | |
3334 | struct vxlan_net *vn = net_generic(src_net, vxlan_net_id); | |
3335 | struct vxlan_dev *tmp; | |
3336 | bool use_ipv6 = false; | |
3337 | ||
3338 | if (conf->flags & VXLAN_F_GPE) { | |
3339 | /* For now, allow GPE only together with | |
3340 | * COLLECT_METADATA. This can be relaxed later; in such | |
3341 | * case, the other side of the PtP link will have to be | |
3342 | * provided. | |
3343 | */ | |
3344 | if ((conf->flags & ~VXLAN_F_ALLOWED_GPE) || | |
3345 | !(conf->flags & VXLAN_F_COLLECT_METADATA)) { | |
3346 | NL_SET_ERR_MSG(extack, | |
3347 | "VXLAN GPE does not support this combination of attributes"); | |
3348 | return -EINVAL; | |
3349 | } | |
3350 | } | |
3351 | ||
3352 | if (!conf->remote_ip.sa.sa_family && !conf->saddr.sa.sa_family) { | |
3353 | /* Unless IPv6 is explicitly requested, assume IPv4 */ | |
3354 | conf->remote_ip.sa.sa_family = AF_INET; | |
3355 | conf->saddr.sa.sa_family = AF_INET; | |
3356 | } else if (!conf->remote_ip.sa.sa_family) { | |
3357 | conf->remote_ip.sa.sa_family = conf->saddr.sa.sa_family; | |
3358 | } else if (!conf->saddr.sa.sa_family) { | |
3359 | conf->saddr.sa.sa_family = conf->remote_ip.sa.sa_family; | |
3360 | } | |
3361 | ||
3362 | if (conf->saddr.sa.sa_family != conf->remote_ip.sa.sa_family) { | |
3363 | NL_SET_ERR_MSG(extack, | |
3364 | "Local and remote address must be from the same family"); | |
3365 | return -EINVAL; | |
3366 | } | |
3367 | ||
3368 | if (vxlan_addr_multicast(&conf->saddr)) { | |
3369 | NL_SET_ERR_MSG(extack, "Local address cannot be multicast"); | |
3370 | return -EINVAL; | |
3371 | } | |
3372 | ||
3373 | if (conf->saddr.sa.sa_family == AF_INET6) { | |
3374 | if (!IS_ENABLED(CONFIG_IPV6)) { | |
3375 | NL_SET_ERR_MSG(extack, | |
3376 | "IPv6 support not enabled in the kernel"); | |
3377 | return -EPFNOSUPPORT; | |
3378 | } | |
3379 | use_ipv6 = true; | |
3380 | conf->flags |= VXLAN_F_IPV6; | |
3381 | ||
3382 | if (!(conf->flags & VXLAN_F_COLLECT_METADATA)) { | |
3383 | int local_type = | |
3384 | ipv6_addr_type(&conf->saddr.sin6.sin6_addr); | |
3385 | int remote_type = | |
3386 | ipv6_addr_type(&conf->remote_ip.sin6.sin6_addr); | |
3387 | ||
3388 | if (local_type & IPV6_ADDR_LINKLOCAL) { | |
3389 | if (!(remote_type & IPV6_ADDR_LINKLOCAL) && | |
3390 | (remote_type != IPV6_ADDR_ANY)) { | |
3391 | NL_SET_ERR_MSG(extack, | |
3392 | "Invalid combination of local and remote address scopes"); | |
3393 | return -EINVAL; | |
3394 | } | |
3395 | ||
3396 | conf->flags |= VXLAN_F_IPV6_LINKLOCAL; | |
3397 | } else { | |
3398 | if (remote_type == | |
3399 | (IPV6_ADDR_UNICAST | IPV6_ADDR_LINKLOCAL)) { | |
3400 | NL_SET_ERR_MSG(extack, | |
3401 | "Invalid combination of local and remote address scopes"); | |
3402 | return -EINVAL; | |
3403 | } | |
3404 | ||
3405 | conf->flags &= ~VXLAN_F_IPV6_LINKLOCAL; | |
3406 | } | |
3407 | } | |
3408 | } | |
3409 | ||
3410 | if (conf->label && !use_ipv6) { | |
3411 | NL_SET_ERR_MSG(extack, | |
3412 | "Label attribute only applies to IPv6 VXLAN devices"); | |
3413 | return -EINVAL; | |
3414 | } | |
3415 | ||
3416 | if (conf->remote_ifindex) { | |
3417 | struct net_device *lowerdev; | |
3418 | ||
3419 | lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex); | |
3420 | if (!lowerdev) { | |
3421 | NL_SET_ERR_MSG(extack, | |
3422 | "Invalid local interface, device not found"); | |
3423 | return -ENODEV; | |
3424 | } | |
3425 | ||
3426 | #if IS_ENABLED(CONFIG_IPV6) | |
3427 | if (use_ipv6) { | |
3428 | struct inet6_dev *idev = __in6_dev_get(lowerdev); | |
3429 | if (idev && idev->cnf.disable_ipv6) { | |
3430 | NL_SET_ERR_MSG(extack, | |
3431 | "IPv6 support disabled by administrator"); | |
3432 | return -EPERM; | |
3433 | } | |
3434 | } | |
3435 | #endif | |
3436 | ||
3437 | *lower = lowerdev; | |
3438 | } else { | |
3439 | if (vxlan_addr_multicast(&conf->remote_ip)) { | |
3440 | NL_SET_ERR_MSG(extack, | |
3441 | "Local interface required for multicast remote destination"); | |
3442 | ||
3443 | return -EINVAL; | |
3444 | } | |
3445 | ||
3446 | #if IS_ENABLED(CONFIG_IPV6) | |
3447 | if (conf->flags & VXLAN_F_IPV6_LINKLOCAL) { | |
3448 | NL_SET_ERR_MSG(extack, | |
3449 | "Local interface required for link-local local/remote addresses"); | |
3450 | return -EINVAL; | |
3451 | } | |
3452 | #endif | |
3453 | ||
3454 | *lower = NULL; | |
3455 | } | |
3456 | ||
3457 | if (!conf->dst_port) { | |
3458 | if (conf->flags & VXLAN_F_GPE) | |
3459 | conf->dst_port = htons(4790); /* IANA VXLAN-GPE port */ | |
3460 | else | |
3461 | conf->dst_port = htons(vxlan_port); | |
3462 | } | |
3463 | ||
3464 | if (!conf->age_interval) | |
3465 | conf->age_interval = FDB_AGE_DEFAULT; | |
3466 | ||
3467 | list_for_each_entry(tmp, &vn->vxlan_list, next) { | |
3468 | if (tmp == old) | |
3469 | continue; | |
3470 | ||
3471 | if (tmp->cfg.vni != conf->vni) | |
3472 | continue; | |
3473 | if (tmp->cfg.dst_port != conf->dst_port) | |
3474 | continue; | |
3475 | if ((tmp->cfg.flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)) != | |
3476 | (conf->flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6))) | |
3477 | continue; | |
3478 | ||
3479 | if ((conf->flags & VXLAN_F_IPV6_LINKLOCAL) && | |
3480 | tmp->cfg.remote_ifindex != conf->remote_ifindex) | |
3481 | continue; | |
3482 | ||
3483 | NL_SET_ERR_MSG(extack, | |
3484 | "A VXLAN device with the specified VNI already exists"); | |
3485 | return -EEXIST; | |
3486 | } | |
3487 | ||
3488 | return 0; | |
3489 | } | |
3490 | ||
3491 | static void vxlan_config_apply(struct net_device *dev, | |
3492 | struct vxlan_config *conf, | |
3493 | struct net_device *lowerdev, | |
3494 | struct net *src_net, | |
3495 | bool changelink) | |
3496 | { | |
3497 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
3498 | struct vxlan_rdst *dst = &vxlan->default_dst; | |
3499 | unsigned short needed_headroom = ETH_HLEN; | |
3500 | bool use_ipv6 = !!(conf->flags & VXLAN_F_IPV6); | |
3501 | int max_mtu = ETH_MAX_MTU; | |
3502 | ||
3503 | if (!changelink) { | |
3504 | if (conf->flags & VXLAN_F_GPE) | |
3505 | vxlan_raw_setup(dev); | |
3506 | else | |
3507 | vxlan_ether_setup(dev); | |
3508 | ||
3509 | if (conf->mtu) | |
3510 | dev->mtu = conf->mtu; | |
3511 | ||
3512 | vxlan->net = src_net; | |
3513 | } | |
3514 | ||
3515 | dst->remote_vni = conf->vni; | |
3516 | ||
3517 | memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip)); | |
3518 | ||
3519 | if (lowerdev) { | |
3520 | dst->remote_ifindex = conf->remote_ifindex; | |
3521 | ||
3522 | dev->gso_max_size = lowerdev->gso_max_size; | |
3523 | dev->gso_max_segs = lowerdev->gso_max_segs; | |
3524 | ||
3525 | needed_headroom = lowerdev->hard_header_len; | |
3526 | ||
3527 | max_mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : | |
3528 | VXLAN_HEADROOM); | |
3529 | if (max_mtu < ETH_MIN_MTU) | |
3530 | max_mtu = ETH_MIN_MTU; | |
3531 | ||
3532 | if (!changelink && !conf->mtu) | |
3533 | dev->mtu = max_mtu; | |
3534 | } | |
3535 | ||
3536 | if (dev->mtu > max_mtu) | |
3537 | dev->mtu = max_mtu; | |
3538 | ||
3539 | if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA) | |
3540 | needed_headroom += VXLAN6_HEADROOM; | |
3541 | else | |
3542 | needed_headroom += VXLAN_HEADROOM; | |
3543 | dev->needed_headroom = needed_headroom; | |
3544 | ||
3545 | memcpy(&vxlan->cfg, conf, sizeof(*conf)); | |
3546 | } | |
3547 | ||
3548 | static int vxlan_dev_configure(struct net *src_net, struct net_device *dev, | |
3549 | struct vxlan_config *conf, bool changelink, | |
3550 | struct netlink_ext_ack *extack) | |
3551 | { | |
3552 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
3553 | struct net_device *lowerdev; | |
3554 | int ret; | |
3555 | ||
3556 | ret = vxlan_config_validate(src_net, conf, &lowerdev, vxlan, extack); | |
3557 | if (ret) | |
3558 | return ret; | |
3559 | ||
3560 | vxlan_config_apply(dev, conf, lowerdev, src_net, changelink); | |
3561 | ||
3562 | return 0; | |
3563 | } | |
3564 | ||
3565 | static int __vxlan_dev_create(struct net *net, struct net_device *dev, | |
3566 | struct vxlan_config *conf, | |
3567 | struct netlink_ext_ack *extack) | |
3568 | { | |
3569 | struct vxlan_net *vn = net_generic(net, vxlan_net_id); | |
3570 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
3571 | struct net_device *remote_dev = NULL; | |
3572 | struct vxlan_fdb *f = NULL; | |
3573 | bool unregister = false; | |
3574 | struct vxlan_rdst *dst; | |
3575 | int err; | |
3576 | ||
3577 | dst = &vxlan->default_dst; | |
3578 | err = vxlan_dev_configure(net, dev, conf, false, extack); | |
3579 | if (err) | |
3580 | return err; | |
3581 | ||
3582 | dev->ethtool_ops = &vxlan_ethtool_ops; | |
3583 | ||
3584 | /* create an fdb entry for a valid default destination */ | |
3585 | if (!vxlan_addr_any(&dst->remote_ip)) { | |
3586 | err = vxlan_fdb_create(vxlan, all_zeros_mac, | |
3587 | &dst->remote_ip, | |
3588 | NUD_REACHABLE | NUD_PERMANENT, | |
3589 | vxlan->cfg.dst_port, | |
3590 | dst->remote_vni, | |
3591 | dst->remote_vni, | |
3592 | dst->remote_ifindex, | |
3593 | NTF_SELF, &f); | |
3594 | if (err) | |
3595 | return err; | |
3596 | } | |
3597 | ||
3598 | err = register_netdevice(dev); | |
3599 | if (err) | |
3600 | goto errout; | |
3601 | unregister = true; | |
3602 | ||
3603 | if (dst->remote_ifindex) { | |
3604 | remote_dev = __dev_get_by_index(net, dst->remote_ifindex); | |
3605 | if (!remote_dev) | |
3606 | goto errout; | |
3607 | ||
3608 | err = netdev_upper_dev_link(remote_dev, dev, extack); | |
3609 | if (err) | |
3610 | goto errout; | |
3611 | } | |
3612 | ||
3613 | err = rtnl_configure_link(dev, NULL); | |
3614 | if (err) | |
3615 | goto unlink; | |
3616 | ||
3617 | if (f) { | |
3618 | vxlan_fdb_insert(vxlan, all_zeros_mac, dst->remote_vni, f); | |
3619 | ||
3620 | /* notify default fdb entry */ | |
3621 | err = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), | |
3622 | RTM_NEWNEIGH, true, extack); | |
3623 | if (err) { | |
3624 | vxlan_fdb_destroy(vxlan, f, false, false); | |
3625 | if (remote_dev) | |
3626 | netdev_upper_dev_unlink(remote_dev, dev); | |
3627 | goto unregister; | |
3628 | } | |
3629 | } | |
3630 | ||
3631 | list_add(&vxlan->next, &vn->vxlan_list); | |
3632 | if (remote_dev) | |
3633 | dst->remote_dev = remote_dev; | |
3634 | return 0; | |
3635 | unlink: | |
3636 | if (remote_dev) | |
3637 | netdev_upper_dev_unlink(remote_dev, dev); | |
3638 | errout: | |
3639 | /* unregister_netdevice() destroys the default FDB entry with deletion | |
3640 | * notification. But the addition notification was not sent yet, so | |
3641 | * destroy the entry by hand here. | |
3642 | */ | |
3643 | if (f) | |
3644 | __vxlan_fdb_free(f); | |
3645 | unregister: | |
3646 | if (unregister) | |
3647 | unregister_netdevice(dev); | |
3648 | return err; | |
3649 | } | |
3650 | ||
3651 | /* Set/clear flags based on attribute */ | |
3652 | static int vxlan_nl2flag(struct vxlan_config *conf, struct nlattr *tb[], | |
3653 | int attrtype, unsigned long mask, bool changelink, | |
3654 | bool changelink_supported, | |
3655 | struct netlink_ext_ack *extack) | |
3656 | { | |
3657 | unsigned long flags; | |
3658 | ||
3659 | if (!tb[attrtype]) | |
3660 | return 0; | |
3661 | ||
3662 | if (changelink && !changelink_supported) { | |
3663 | vxlan_flag_attr_error(attrtype, extack); | |
3664 | return -EOPNOTSUPP; | |
3665 | } | |
3666 | ||
3667 | if (vxlan_policy[attrtype].type == NLA_FLAG) | |
3668 | flags = conf->flags | mask; | |
3669 | else if (nla_get_u8(tb[attrtype])) | |
3670 | flags = conf->flags | mask; | |
3671 | else | |
3672 | flags = conf->flags & ~mask; | |
3673 | ||
3674 | conf->flags = flags; | |
3675 | ||
3676 | return 0; | |
3677 | } | |
3678 | ||
3679 | static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[], | |
3680 | struct net_device *dev, struct vxlan_config *conf, | |
3681 | bool changelink, struct netlink_ext_ack *extack) | |
3682 | { | |
3683 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
3684 | int err = 0; | |
3685 | ||
3686 | memset(conf, 0, sizeof(*conf)); | |
3687 | ||
3688 | /* if changelink operation, start with old existing cfg */ | |
3689 | if (changelink) | |
3690 | memcpy(conf, &vxlan->cfg, sizeof(*conf)); | |
3691 | ||
3692 | if (data[IFLA_VXLAN_ID]) { | |
3693 | __be32 vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID])); | |
3694 | ||
3695 | if (changelink && (vni != conf->vni)) { | |
3696 | NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_ID], "Cannot change VNI"); | |
3697 | return -EOPNOTSUPP; | |
3698 | } | |
3699 | conf->vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID])); | |
3700 | } | |
3701 | ||
3702 | if (data[IFLA_VXLAN_GROUP]) { | |
3703 | if (changelink && (conf->remote_ip.sa.sa_family != AF_INET)) { | |
3704 | NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP], "New group address family does not match old group"); | |
3705 | return -EOPNOTSUPP; | |
3706 | } | |
3707 | ||
3708 | conf->remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]); | |
3709 | conf->remote_ip.sa.sa_family = AF_INET; | |
3710 | } else if (data[IFLA_VXLAN_GROUP6]) { | |
3711 | if (!IS_ENABLED(CONFIG_IPV6)) { | |
3712 | NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "IPv6 support not enabled in the kernel"); | |
3713 | return -EPFNOSUPPORT; | |
3714 | } | |
3715 | ||
3716 | if (changelink && (conf->remote_ip.sa.sa_family != AF_INET6)) { | |
3717 | NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "New group address family does not match old group"); | |
3718 | return -EOPNOTSUPP; | |
3719 | } | |
3720 | ||
3721 | conf->remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]); | |
3722 | conf->remote_ip.sa.sa_family = AF_INET6; | |
3723 | } | |
3724 | ||
3725 | if (data[IFLA_VXLAN_LOCAL]) { | |
3726 | if (changelink && (conf->saddr.sa.sa_family != AF_INET)) { | |
3727 | NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL], "New local address family does not match old"); | |
3728 | return -EOPNOTSUPP; | |
3729 | } | |
3730 | ||
3731 | conf->saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]); | |
3732 | conf->saddr.sa.sa_family = AF_INET; | |
3733 | } else if (data[IFLA_VXLAN_LOCAL6]) { | |
3734 | if (!IS_ENABLED(CONFIG_IPV6)) { | |
3735 | NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "IPv6 support not enabled in the kernel"); | |
3736 | return -EPFNOSUPPORT; | |
3737 | } | |
3738 | ||
3739 | if (changelink && (conf->saddr.sa.sa_family != AF_INET6)) { | |
3740 | NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "New local address family does not match old"); | |
3741 | return -EOPNOTSUPP; | |
3742 | } | |
3743 | ||
3744 | /* TODO: respect scope id */ | |
3745 | conf->saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]); | |
3746 | conf->saddr.sa.sa_family = AF_INET6; | |
3747 | } | |
3748 | ||
3749 | if (data[IFLA_VXLAN_LINK]) | |
3750 | conf->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]); | |
3751 | ||
3752 | if (data[IFLA_VXLAN_TOS]) | |
3753 | conf->tos = nla_get_u8(data[IFLA_VXLAN_TOS]); | |
3754 | ||
3755 | if (data[IFLA_VXLAN_TTL]) | |
3756 | conf->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]); | |
3757 | ||
3758 | if (data[IFLA_VXLAN_TTL_INHERIT]) { | |
3759 | err = vxlan_nl2flag(conf, data, IFLA_VXLAN_TTL_INHERIT, | |
3760 | VXLAN_F_TTL_INHERIT, changelink, false, | |
3761 | extack); | |
3762 | if (err) | |
3763 | return err; | |
3764 | ||
3765 | } | |
3766 | ||
3767 | if (data[IFLA_VXLAN_LABEL]) | |
3768 | conf->label = nla_get_be32(data[IFLA_VXLAN_LABEL]) & | |
3769 | IPV6_FLOWLABEL_MASK; | |
3770 | ||
3771 | if (data[IFLA_VXLAN_LEARNING]) { | |
3772 | err = vxlan_nl2flag(conf, data, IFLA_VXLAN_LEARNING, | |
3773 | VXLAN_F_LEARN, changelink, true, | |
3774 | extack); | |
3775 | if (err) | |
3776 | return err; | |
3777 | } else if (!changelink) { | |
3778 | /* default to learn on a new device */ | |
3779 | conf->flags |= VXLAN_F_LEARN; | |
3780 | } | |
3781 | ||
3782 | if (data[IFLA_VXLAN_AGEING]) | |
3783 | conf->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]); | |
3784 | ||
3785 | if (data[IFLA_VXLAN_PROXY]) { | |
3786 | err = vxlan_nl2flag(conf, data, IFLA_VXLAN_PROXY, | |
3787 | VXLAN_F_PROXY, changelink, false, | |
3788 | extack); | |
3789 | if (err) | |
3790 | return err; | |
3791 | } | |
3792 | ||
3793 | if (data[IFLA_VXLAN_RSC]) { | |
3794 | err = vxlan_nl2flag(conf, data, IFLA_VXLAN_RSC, | |
3795 | VXLAN_F_RSC, changelink, false, | |
3796 | extack); | |
3797 | if (err) | |
3798 | return err; | |
3799 | } | |
3800 | ||
3801 | if (data[IFLA_VXLAN_L2MISS]) { | |
3802 | err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L2MISS, | |
3803 | VXLAN_F_L2MISS, changelink, false, | |
3804 | extack); | |
3805 | if (err) | |
3806 | return err; | |
3807 | } | |
3808 | ||
3809 | if (data[IFLA_VXLAN_L3MISS]) { | |
3810 | err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L3MISS, | |
3811 | VXLAN_F_L3MISS, changelink, false, | |
3812 | extack); | |
3813 | if (err) | |
3814 | return err; | |
3815 | } | |
3816 | ||
3817 | if (data[IFLA_VXLAN_LIMIT]) { | |
3818 | if (changelink) { | |
3819 | NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LIMIT], | |
3820 | "Cannot change limit"); | |
3821 | return -EOPNOTSUPP; | |
3822 | } | |
3823 | conf->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]); | |
3824 | } | |
3825 | ||
3826 | if (data[IFLA_VXLAN_COLLECT_METADATA]) { | |
3827 | err = vxlan_nl2flag(conf, data, IFLA_VXLAN_COLLECT_METADATA, | |
3828 | VXLAN_F_COLLECT_METADATA, changelink, false, | |
3829 | extack); | |
3830 | if (err) | |
3831 | return err; | |
3832 | } | |
3833 | ||
3834 | if (data[IFLA_VXLAN_PORT_RANGE]) { | |
3835 | if (!changelink) { | |
3836 | const struct ifla_vxlan_port_range *p | |
3837 | = nla_data(data[IFLA_VXLAN_PORT_RANGE]); | |
3838 | conf->port_min = ntohs(p->low); | |
3839 | conf->port_max = ntohs(p->high); | |
3840 | } else { | |
3841 | NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT_RANGE], | |
3842 | "Cannot change port range"); | |
3843 | return -EOPNOTSUPP; | |
3844 | } | |
3845 | } | |
3846 | ||
3847 | if (data[IFLA_VXLAN_PORT]) { | |
3848 | if (changelink) { | |
3849 | NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT], | |
3850 | "Cannot change port"); | |
3851 | return -EOPNOTSUPP; | |
3852 | } | |
3853 | conf->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]); | |
3854 | } | |
3855 | ||
3856 | if (data[IFLA_VXLAN_UDP_CSUM]) { | |
3857 | if (changelink) { | |
3858 | NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_UDP_CSUM], | |
3859 | "Cannot change UDP_CSUM flag"); | |
3860 | return -EOPNOTSUPP; | |
3861 | } | |
3862 | if (!nla_get_u8(data[IFLA_VXLAN_UDP_CSUM])) | |
3863 | conf->flags |= VXLAN_F_UDP_ZERO_CSUM_TX; | |
3864 | } | |
3865 | ||
3866 | if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]) { | |
3867 | err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_TX, | |
3868 | VXLAN_F_UDP_ZERO_CSUM6_TX, changelink, | |
3869 | false, extack); | |
3870 | if (err) | |
3871 | return err; | |
3872 | } | |
3873 | ||
3874 | if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]) { | |
3875 | err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_RX, | |
3876 | VXLAN_F_UDP_ZERO_CSUM6_RX, changelink, | |
3877 | false, extack); | |
3878 | if (err) | |
3879 | return err; | |
3880 | } | |
3881 | ||
3882 | if (data[IFLA_VXLAN_REMCSUM_TX]) { | |
3883 | err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_TX, | |
3884 | VXLAN_F_REMCSUM_TX, changelink, false, | |
3885 | extack); | |
3886 | if (err) | |
3887 | return err; | |
3888 | } | |
3889 | ||
3890 | if (data[IFLA_VXLAN_REMCSUM_RX]) { | |
3891 | err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_RX, | |
3892 | VXLAN_F_REMCSUM_RX, changelink, false, | |
3893 | extack); | |
3894 | if (err) | |
3895 | return err; | |
3896 | } | |
3897 | ||
3898 | if (data[IFLA_VXLAN_GBP]) { | |
3899 | err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GBP, | |
3900 | VXLAN_F_GBP, changelink, false, extack); | |
3901 | if (err) | |
3902 | return err; | |
3903 | } | |
3904 | ||
3905 | if (data[IFLA_VXLAN_GPE]) { | |
3906 | err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GPE, | |
3907 | VXLAN_F_GPE, changelink, false, | |
3908 | extack); | |
3909 | if (err) | |
3910 | return err; | |
3911 | } | |
3912 | ||
3913 | if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL]) { | |
3914 | err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_NOPARTIAL, | |
3915 | VXLAN_F_REMCSUM_NOPARTIAL, changelink, | |
3916 | false, extack); | |
3917 | if (err) | |
3918 | return err; | |
3919 | } | |
3920 | ||
3921 | if (tb[IFLA_MTU]) { | |
3922 | if (changelink) { | |
3923 | NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU], | |
3924 | "Cannot change mtu"); | |
3925 | return -EOPNOTSUPP; | |
3926 | } | |
3927 | conf->mtu = nla_get_u32(tb[IFLA_MTU]); | |
3928 | } | |
3929 | ||
3930 | if (data[IFLA_VXLAN_DF]) | |
3931 | conf->df = nla_get_u8(data[IFLA_VXLAN_DF]); | |
3932 | ||
3933 | return 0; | |
3934 | } | |
3935 | ||
3936 | static int vxlan_newlink(struct net *src_net, struct net_device *dev, | |
3937 | struct nlattr *tb[], struct nlattr *data[], | |
3938 | struct netlink_ext_ack *extack) | |
3939 | { | |
3940 | struct vxlan_config conf; | |
3941 | int err; | |
3942 | ||
3943 | err = vxlan_nl2conf(tb, data, dev, &conf, false, extack); | |
3944 | if (err) | |
3945 | return err; | |
3946 | ||
3947 | return __vxlan_dev_create(src_net, dev, &conf, extack); | |
3948 | } | |
3949 | ||
3950 | static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[], | |
3951 | struct nlattr *data[], | |
3952 | struct netlink_ext_ack *extack) | |
3953 | { | |
3954 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
3955 | struct net_device *lowerdev; | |
3956 | struct vxlan_config conf; | |
3957 | struct vxlan_rdst *dst; | |
3958 | int err; | |
3959 | ||
3960 | dst = &vxlan->default_dst; | |
3961 | err = vxlan_nl2conf(tb, data, dev, &conf, true, extack); | |
3962 | if (err) | |
3963 | return err; | |
3964 | ||
3965 | err = vxlan_config_validate(vxlan->net, &conf, &lowerdev, | |
3966 | vxlan, extack); | |
3967 | if (err) | |
3968 | return err; | |
3969 | ||
3970 | err = netdev_adjacent_change_prepare(dst->remote_dev, lowerdev, dev, | |
3971 | extack); | |
3972 | if (err) | |
3973 | return err; | |
3974 | ||
3975 | /* handle default dst entry */ | |
3976 | if (!vxlan_addr_equal(&conf.remote_ip, &dst->remote_ip)) { | |
3977 | u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, conf.vni); | |
3978 | ||
3979 | spin_lock_bh(&vxlan->hash_lock[hash_index]); | |
3980 | if (!vxlan_addr_any(&conf.remote_ip)) { | |
3981 | err = vxlan_fdb_update(vxlan, all_zeros_mac, | |
3982 | &conf.remote_ip, | |
3983 | NUD_REACHABLE | NUD_PERMANENT, | |
3984 | NLM_F_APPEND | NLM_F_CREATE, | |
3985 | vxlan->cfg.dst_port, | |
3986 | conf.vni, conf.vni, | |
3987 | conf.remote_ifindex, | |
3988 | NTF_SELF, true, extack); | |
3989 | if (err) { | |
3990 | spin_unlock_bh(&vxlan->hash_lock[hash_index]); | |
3991 | netdev_adjacent_change_abort(dst->remote_dev, | |
3992 | lowerdev, dev); | |
3993 | return err; | |
3994 | } | |
3995 | } | |
3996 | if (!vxlan_addr_any(&dst->remote_ip)) | |
3997 | __vxlan_fdb_delete(vxlan, all_zeros_mac, | |
3998 | dst->remote_ip, | |
3999 | vxlan->cfg.dst_port, | |
4000 | dst->remote_vni, | |
4001 | dst->remote_vni, | |
4002 | dst->remote_ifindex, | |
4003 | true); | |
4004 | spin_unlock_bh(&vxlan->hash_lock[hash_index]); | |
4005 | } | |
4006 | ||
4007 | if (conf.age_interval != vxlan->cfg.age_interval) | |
4008 | mod_timer(&vxlan->age_timer, jiffies); | |
4009 | ||
4010 | netdev_adjacent_change_commit(dst->remote_dev, lowerdev, dev); | |
4011 | if (lowerdev && lowerdev != dst->remote_dev) | |
4012 | dst->remote_dev = lowerdev; | |
4013 | ||
4014 | netdev_update_lockdep_key(lowerdev); | |
4015 | vxlan_config_apply(dev, &conf, lowerdev, vxlan->net, true); | |
4016 | return 0; | |
4017 | } | |
4018 | ||
4019 | static void vxlan_dellink(struct net_device *dev, struct list_head *head) | |
4020 | { | |
4021 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
4022 | ||
4023 | vxlan_flush(vxlan, true); | |
4024 | ||
4025 | list_del(&vxlan->next); | |
4026 | unregister_netdevice_queue(dev, head); | |
4027 | if (vxlan->default_dst.remote_dev) | |
4028 | netdev_upper_dev_unlink(vxlan->default_dst.remote_dev, dev); | |
4029 | } | |
4030 | ||
4031 | static size_t vxlan_get_size(const struct net_device *dev) | |
4032 | { | |
4033 | ||
4034 | return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */ | |
4035 | nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */ | |
4036 | nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */ | |
4037 | nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */ | |
4038 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */ | |
4039 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL_INHERIT */ | |
4040 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */ | |
4041 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_DF */ | |
4042 | nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */ | |
4043 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */ | |
4044 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */ | |
4045 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */ | |
4046 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */ | |
4047 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */ | |
4048 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_COLLECT_METADATA */ | |
4049 | nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */ | |
4050 | nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */ | |
4051 | nla_total_size(sizeof(struct ifla_vxlan_port_range)) + | |
4052 | nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */ | |
4053 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */ | |
4054 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */ | |
4055 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */ | |
4056 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */ | |
4057 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */ | |
4058 | 0; | |
4059 | } | |
4060 | ||
4061 | static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
4062 | { | |
4063 | const struct vxlan_dev *vxlan = netdev_priv(dev); | |
4064 | const struct vxlan_rdst *dst = &vxlan->default_dst; | |
4065 | struct ifla_vxlan_port_range ports = { | |
4066 | .low = htons(vxlan->cfg.port_min), | |
4067 | .high = htons(vxlan->cfg.port_max), | |
4068 | }; | |
4069 | ||
4070 | if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni))) | |
4071 | goto nla_put_failure; | |
4072 | ||
4073 | if (!vxlan_addr_any(&dst->remote_ip)) { | |
4074 | if (dst->remote_ip.sa.sa_family == AF_INET) { | |
4075 | if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP, | |
4076 | dst->remote_ip.sin.sin_addr.s_addr)) | |
4077 | goto nla_put_failure; | |
4078 | #if IS_ENABLED(CONFIG_IPV6) | |
4079 | } else { | |
4080 | if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6, | |
4081 | &dst->remote_ip.sin6.sin6_addr)) | |
4082 | goto nla_put_failure; | |
4083 | #endif | |
4084 | } | |
4085 | } | |
4086 | ||
4087 | if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex)) | |
4088 | goto nla_put_failure; | |
4089 | ||
4090 | if (!vxlan_addr_any(&vxlan->cfg.saddr)) { | |
4091 | if (vxlan->cfg.saddr.sa.sa_family == AF_INET) { | |
4092 | if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL, | |
4093 | vxlan->cfg.saddr.sin.sin_addr.s_addr)) | |
4094 | goto nla_put_failure; | |
4095 | #if IS_ENABLED(CONFIG_IPV6) | |
4096 | } else { | |
4097 | if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6, | |
4098 | &vxlan->cfg.saddr.sin6.sin6_addr)) | |
4099 | goto nla_put_failure; | |
4100 | #endif | |
4101 | } | |
4102 | } | |
4103 | ||
4104 | if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) || | |
4105 | nla_put_u8(skb, IFLA_VXLAN_TTL_INHERIT, | |
4106 | !!(vxlan->cfg.flags & VXLAN_F_TTL_INHERIT)) || | |
4107 | nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) || | |
4108 | nla_put_u8(skb, IFLA_VXLAN_DF, vxlan->cfg.df) || | |
4109 | nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) || | |
4110 | nla_put_u8(skb, IFLA_VXLAN_LEARNING, | |
4111 | !!(vxlan->cfg.flags & VXLAN_F_LEARN)) || | |
4112 | nla_put_u8(skb, IFLA_VXLAN_PROXY, | |
4113 | !!(vxlan->cfg.flags & VXLAN_F_PROXY)) || | |
4114 | nla_put_u8(skb, IFLA_VXLAN_RSC, | |
4115 | !!(vxlan->cfg.flags & VXLAN_F_RSC)) || | |
4116 | nla_put_u8(skb, IFLA_VXLAN_L2MISS, | |
4117 | !!(vxlan->cfg.flags & VXLAN_F_L2MISS)) || | |
4118 | nla_put_u8(skb, IFLA_VXLAN_L3MISS, | |
4119 | !!(vxlan->cfg.flags & VXLAN_F_L3MISS)) || | |
4120 | nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA, | |
4121 | !!(vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)) || | |
4122 | nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) || | |
4123 | nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) || | |
4124 | nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) || | |
4125 | nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM, | |
4126 | !(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM_TX)) || | |
4127 | nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX, | |
4128 | !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) || | |
4129 | nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX, | |
4130 | !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) || | |
4131 | nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX, | |
4132 | !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_TX)) || | |
4133 | nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX, | |
4134 | !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_RX))) | |
4135 | goto nla_put_failure; | |
4136 | ||
4137 | if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports)) | |
4138 | goto nla_put_failure; | |
4139 | ||
4140 | if (vxlan->cfg.flags & VXLAN_F_GBP && | |
4141 | nla_put_flag(skb, IFLA_VXLAN_GBP)) | |
4142 | goto nla_put_failure; | |
4143 | ||
4144 | if (vxlan->cfg.flags & VXLAN_F_GPE && | |
4145 | nla_put_flag(skb, IFLA_VXLAN_GPE)) | |
4146 | goto nla_put_failure; | |
4147 | ||
4148 | if (vxlan->cfg.flags & VXLAN_F_REMCSUM_NOPARTIAL && | |
4149 | nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL)) | |
4150 | goto nla_put_failure; | |
4151 | ||
4152 | return 0; | |
4153 | ||
4154 | nla_put_failure: | |
4155 | return -EMSGSIZE; | |
4156 | } | |
4157 | ||
4158 | static struct net *vxlan_get_link_net(const struct net_device *dev) | |
4159 | { | |
4160 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
4161 | ||
4162 | return vxlan->net; | |
4163 | } | |
4164 | ||
4165 | static struct rtnl_link_ops vxlan_link_ops __read_mostly = { | |
4166 | .kind = "vxlan", | |
4167 | .maxtype = IFLA_VXLAN_MAX, | |
4168 | .policy = vxlan_policy, | |
4169 | .priv_size = sizeof(struct vxlan_dev), | |
4170 | .setup = vxlan_setup, | |
4171 | .validate = vxlan_validate, | |
4172 | .newlink = vxlan_newlink, | |
4173 | .changelink = vxlan_changelink, | |
4174 | .dellink = vxlan_dellink, | |
4175 | .get_size = vxlan_get_size, | |
4176 | .fill_info = vxlan_fill_info, | |
4177 | .get_link_net = vxlan_get_link_net, | |
4178 | }; | |
4179 | ||
4180 | struct net_device *vxlan_dev_create(struct net *net, const char *name, | |
4181 | u8 name_assign_type, | |
4182 | struct vxlan_config *conf) | |
4183 | { | |
4184 | struct nlattr *tb[IFLA_MAX + 1]; | |
4185 | struct net_device *dev; | |
4186 | int err; | |
4187 | ||
4188 | memset(&tb, 0, sizeof(tb)); | |
4189 | ||
4190 | dev = rtnl_create_link(net, name, name_assign_type, | |
4191 | &vxlan_link_ops, tb, NULL); | |
4192 | if (IS_ERR(dev)) | |
4193 | return dev; | |
4194 | ||
4195 | err = __vxlan_dev_create(net, dev, conf, NULL); | |
4196 | if (err < 0) { | |
4197 | free_netdev(dev); | |
4198 | return ERR_PTR(err); | |
4199 | } | |
4200 | ||
4201 | err = rtnl_configure_link(dev, NULL); | |
4202 | if (err < 0) { | |
4203 | LIST_HEAD(list_kill); | |
4204 | ||
4205 | vxlan_dellink(dev, &list_kill); | |
4206 | unregister_netdevice_many(&list_kill); | |
4207 | return ERR_PTR(err); | |
4208 | } | |
4209 | ||
4210 | return dev; | |
4211 | } | |
4212 | EXPORT_SYMBOL_GPL(vxlan_dev_create); | |
4213 | ||
4214 | static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn, | |
4215 | struct net_device *dev) | |
4216 | { | |
4217 | struct vxlan_dev *vxlan, *next; | |
4218 | LIST_HEAD(list_kill); | |
4219 | ||
4220 | list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) { | |
4221 | struct vxlan_rdst *dst = &vxlan->default_dst; | |
4222 | ||
4223 | /* In case we created vxlan device with carrier | |
4224 | * and we loose the carrier due to module unload | |
4225 | * we also need to remove vxlan device. In other | |
4226 | * cases, it's not necessary and remote_ifindex | |
4227 | * is 0 here, so no matches. | |
4228 | */ | |
4229 | if (dst->remote_ifindex == dev->ifindex) | |
4230 | vxlan_dellink(vxlan->dev, &list_kill); | |
4231 | } | |
4232 | ||
4233 | unregister_netdevice_many(&list_kill); | |
4234 | } | |
4235 | ||
4236 | static int vxlan_netdevice_event(struct notifier_block *unused, | |
4237 | unsigned long event, void *ptr) | |
4238 | { | |
4239 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
4240 | struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id); | |
4241 | ||
4242 | if (event == NETDEV_UNREGISTER) { | |
4243 | vxlan_offload_rx_ports(dev, false); | |
4244 | vxlan_handle_lowerdev_unregister(vn, dev); | |
4245 | } else if (event == NETDEV_REGISTER) { | |
4246 | vxlan_offload_rx_ports(dev, true); | |
4247 | } else if (event == NETDEV_UDP_TUNNEL_PUSH_INFO || | |
4248 | event == NETDEV_UDP_TUNNEL_DROP_INFO) { | |
4249 | vxlan_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO); | |
4250 | } | |
4251 | ||
4252 | return NOTIFY_DONE; | |
4253 | } | |
4254 | ||
4255 | static struct notifier_block vxlan_notifier_block __read_mostly = { | |
4256 | .notifier_call = vxlan_netdevice_event, | |
4257 | }; | |
4258 | ||
4259 | static void | |
4260 | vxlan_fdb_offloaded_set(struct net_device *dev, | |
4261 | struct switchdev_notifier_vxlan_fdb_info *fdb_info) | |
4262 | { | |
4263 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
4264 | struct vxlan_rdst *rdst; | |
4265 | struct vxlan_fdb *f; | |
4266 | u32 hash_index; | |
4267 | ||
4268 | hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni); | |
4269 | ||
4270 | spin_lock_bh(&vxlan->hash_lock[hash_index]); | |
4271 | ||
4272 | f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni); | |
4273 | if (!f) | |
4274 | goto out; | |
4275 | ||
4276 | rdst = vxlan_fdb_find_rdst(f, &fdb_info->remote_ip, | |
4277 | fdb_info->remote_port, | |
4278 | fdb_info->remote_vni, | |
4279 | fdb_info->remote_ifindex); | |
4280 | if (!rdst) | |
4281 | goto out; | |
4282 | ||
4283 | rdst->offloaded = fdb_info->offloaded; | |
4284 | ||
4285 | out: | |
4286 | spin_unlock_bh(&vxlan->hash_lock[hash_index]); | |
4287 | } | |
4288 | ||
4289 | static int | |
4290 | vxlan_fdb_external_learn_add(struct net_device *dev, | |
4291 | struct switchdev_notifier_vxlan_fdb_info *fdb_info) | |
4292 | { | |
4293 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
4294 | struct netlink_ext_ack *extack; | |
4295 | u32 hash_index; | |
4296 | int err; | |
4297 | ||
4298 | hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni); | |
4299 | extack = switchdev_notifier_info_to_extack(&fdb_info->info); | |
4300 | ||
4301 | spin_lock_bh(&vxlan->hash_lock[hash_index]); | |
4302 | err = vxlan_fdb_update(vxlan, fdb_info->eth_addr, &fdb_info->remote_ip, | |
4303 | NUD_REACHABLE, | |
4304 | NLM_F_CREATE | NLM_F_REPLACE, | |
4305 | fdb_info->remote_port, | |
4306 | fdb_info->vni, | |
4307 | fdb_info->remote_vni, | |
4308 | fdb_info->remote_ifindex, | |
4309 | NTF_USE | NTF_SELF | NTF_EXT_LEARNED, | |
4310 | false, extack); | |
4311 | spin_unlock_bh(&vxlan->hash_lock[hash_index]); | |
4312 | ||
4313 | return err; | |
4314 | } | |
4315 | ||
4316 | static int | |
4317 | vxlan_fdb_external_learn_del(struct net_device *dev, | |
4318 | struct switchdev_notifier_vxlan_fdb_info *fdb_info) | |
4319 | { | |
4320 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
4321 | struct vxlan_fdb *f; | |
4322 | u32 hash_index; | |
4323 | int err = 0; | |
4324 | ||
4325 | hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni); | |
4326 | spin_lock_bh(&vxlan->hash_lock[hash_index]); | |
4327 | ||
4328 | f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni); | |
4329 | if (!f) | |
4330 | err = -ENOENT; | |
4331 | else if (f->flags & NTF_EXT_LEARNED) | |
4332 | err = __vxlan_fdb_delete(vxlan, fdb_info->eth_addr, | |
4333 | fdb_info->remote_ip, | |
4334 | fdb_info->remote_port, | |
4335 | fdb_info->vni, | |
4336 | fdb_info->remote_vni, | |
4337 | fdb_info->remote_ifindex, | |
4338 | false); | |
4339 | ||
4340 | spin_unlock_bh(&vxlan->hash_lock[hash_index]); | |
4341 | ||
4342 | return err; | |
4343 | } | |
4344 | ||
4345 | static int vxlan_switchdev_event(struct notifier_block *unused, | |
4346 | unsigned long event, void *ptr) | |
4347 | { | |
4348 | struct net_device *dev = switchdev_notifier_info_to_dev(ptr); | |
4349 | struct switchdev_notifier_vxlan_fdb_info *fdb_info; | |
4350 | int err = 0; | |
4351 | ||
4352 | switch (event) { | |
4353 | case SWITCHDEV_VXLAN_FDB_OFFLOADED: | |
4354 | vxlan_fdb_offloaded_set(dev, ptr); | |
4355 | break; | |
4356 | case SWITCHDEV_VXLAN_FDB_ADD_TO_BRIDGE: | |
4357 | fdb_info = ptr; | |
4358 | err = vxlan_fdb_external_learn_add(dev, fdb_info); | |
4359 | if (err) { | |
4360 | err = notifier_from_errno(err); | |
4361 | break; | |
4362 | } | |
4363 | fdb_info->offloaded = true; | |
4364 | vxlan_fdb_offloaded_set(dev, fdb_info); | |
4365 | break; | |
4366 | case SWITCHDEV_VXLAN_FDB_DEL_TO_BRIDGE: | |
4367 | fdb_info = ptr; | |
4368 | err = vxlan_fdb_external_learn_del(dev, fdb_info); | |
4369 | if (err) { | |
4370 | err = notifier_from_errno(err); | |
4371 | break; | |
4372 | } | |
4373 | fdb_info->offloaded = false; | |
4374 | vxlan_fdb_offloaded_set(dev, fdb_info); | |
4375 | break; | |
4376 | } | |
4377 | ||
4378 | return err; | |
4379 | } | |
4380 | ||
4381 | static struct notifier_block vxlan_switchdev_notifier_block __read_mostly = { | |
4382 | .notifier_call = vxlan_switchdev_event, | |
4383 | }; | |
4384 | ||
4385 | static __net_init int vxlan_init_net(struct net *net) | |
4386 | { | |
4387 | struct vxlan_net *vn = net_generic(net, vxlan_net_id); | |
4388 | unsigned int h; | |
4389 | ||
4390 | INIT_LIST_HEAD(&vn->vxlan_list); | |
4391 | spin_lock_init(&vn->sock_lock); | |
4392 | ||
4393 | for (h = 0; h < PORT_HASH_SIZE; ++h) | |
4394 | INIT_HLIST_HEAD(&vn->sock_list[h]); | |
4395 | ||
4396 | return 0; | |
4397 | } | |
4398 | ||
4399 | static void vxlan_destroy_tunnels(struct net *net, struct list_head *head) | |
4400 | { | |
4401 | struct vxlan_net *vn = net_generic(net, vxlan_net_id); | |
4402 | struct vxlan_dev *vxlan, *next; | |
4403 | struct net_device *dev, *aux; | |
4404 | unsigned int h; | |
4405 | ||
4406 | for_each_netdev_safe(net, dev, aux) | |
4407 | if (dev->rtnl_link_ops == &vxlan_link_ops) | |
4408 | unregister_netdevice_queue(dev, head); | |
4409 | ||
4410 | list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) { | |
4411 | /* If vxlan->dev is in the same netns, it has already been added | |
4412 | * to the list by the previous loop. | |
4413 | */ | |
4414 | if (!net_eq(dev_net(vxlan->dev), net)) | |
4415 | unregister_netdevice_queue(vxlan->dev, head); | |
4416 | } | |
4417 | ||
4418 | for (h = 0; h < PORT_HASH_SIZE; ++h) | |
4419 | WARN_ON_ONCE(!hlist_empty(&vn->sock_list[h])); | |
4420 | } | |
4421 | ||
4422 | static void __net_exit vxlan_exit_batch_net(struct list_head *net_list) | |
4423 | { | |
4424 | struct net *net; | |
4425 | LIST_HEAD(list); | |
4426 | ||
4427 | rtnl_lock(); | |
4428 | list_for_each_entry(net, net_list, exit_list) | |
4429 | vxlan_destroy_tunnels(net, &list); | |
4430 | ||
4431 | unregister_netdevice_many(&list); | |
4432 | rtnl_unlock(); | |
4433 | } | |
4434 | ||
4435 | static struct pernet_operations vxlan_net_ops = { | |
4436 | .init = vxlan_init_net, | |
4437 | .exit_batch = vxlan_exit_batch_net, | |
4438 | .id = &vxlan_net_id, | |
4439 | .size = sizeof(struct vxlan_net), | |
4440 | }; | |
4441 | ||
4442 | static int __init vxlan_init_module(void) | |
4443 | { | |
4444 | int rc; | |
4445 | ||
4446 | get_random_bytes(&vxlan_salt, sizeof(vxlan_salt)); | |
4447 | ||
4448 | rc = register_pernet_subsys(&vxlan_net_ops); | |
4449 | if (rc) | |
4450 | goto out1; | |
4451 | ||
4452 | rc = register_netdevice_notifier(&vxlan_notifier_block); | |
4453 | if (rc) | |
4454 | goto out2; | |
4455 | ||
4456 | rc = register_switchdev_notifier(&vxlan_switchdev_notifier_block); | |
4457 | if (rc) | |
4458 | goto out3; | |
4459 | ||
4460 | rc = rtnl_link_register(&vxlan_link_ops); | |
4461 | if (rc) | |
4462 | goto out4; | |
4463 | ||
4464 | return 0; | |
4465 | out4: | |
4466 | unregister_switchdev_notifier(&vxlan_switchdev_notifier_block); | |
4467 | out3: | |
4468 | unregister_netdevice_notifier(&vxlan_notifier_block); | |
4469 | out2: | |
4470 | unregister_pernet_subsys(&vxlan_net_ops); | |
4471 | out1: | |
4472 | return rc; | |
4473 | } | |
4474 | late_initcall(vxlan_init_module); | |
4475 | ||
4476 | static void __exit vxlan_cleanup_module(void) | |
4477 | { | |
4478 | rtnl_link_unregister(&vxlan_link_ops); | |
4479 | unregister_switchdev_notifier(&vxlan_switchdev_notifier_block); | |
4480 | unregister_netdevice_notifier(&vxlan_notifier_block); | |
4481 | unregister_pernet_subsys(&vxlan_net_ops); | |
4482 | /* rcu_barrier() is called by netns */ | |
4483 | } | |
4484 | module_exit(vxlan_cleanup_module); | |
4485 | ||
4486 | MODULE_LICENSE("GPL"); | |
4487 | MODULE_VERSION(VXLAN_VERSION); | |
4488 | MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>"); | |
4489 | MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic"); | |
4490 | MODULE_ALIAS_RTNL_LINK("vxlan"); |