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d342894c | 1 | /* |
2 | * VXLAN: Virtual eXtensiable Local Area Network | |
3 | * | |
4 | * Copyright (c) 2012 Vyatta Inc. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | * TODO | |
11 | * - use IANA UDP port number (when defined) | |
12 | * - IPv6 (not in RFC) | |
13 | */ | |
14 | ||
15 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
16 | ||
17 | #include <linux/kernel.h> | |
18 | #include <linux/types.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/errno.h> | |
21 | #include <linux/slab.h> | |
22 | #include <linux/skbuff.h> | |
23 | #include <linux/rculist.h> | |
24 | #include <linux/netdevice.h> | |
25 | #include <linux/in.h> | |
26 | #include <linux/ip.h> | |
27 | #include <linux/udp.h> | |
28 | #include <linux/igmp.h> | |
29 | #include <linux/etherdevice.h> | |
30 | #include <linux/if_ether.h> | |
d342894c | 31 | #include <linux/hash.h> |
32 | #include <net/ip.h> | |
33 | #include <net/icmp.h> | |
34 | #include <net/udp.h> | |
35 | #include <net/rtnetlink.h> | |
36 | #include <net/route.h> | |
37 | #include <net/dsfield.h> | |
38 | #include <net/inet_ecn.h> | |
39 | #include <net/net_namespace.h> | |
40 | #include <net/netns/generic.h> | |
41 | ||
42 | #define VXLAN_VERSION "0.1" | |
43 | ||
44 | #define VNI_HASH_BITS 10 | |
45 | #define VNI_HASH_SIZE (1<<VNI_HASH_BITS) | |
46 | #define FDB_HASH_BITS 8 | |
47 | #define FDB_HASH_SIZE (1<<FDB_HASH_BITS) | |
48 | #define FDB_AGE_DEFAULT 300 /* 5 min */ | |
49 | #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */ | |
50 | ||
51 | #define VXLAN_N_VID (1u << 24) | |
52 | #define VXLAN_VID_MASK (VXLAN_N_VID - 1) | |
53 | /* VLAN + IP header + UDP + VXLAN */ | |
54 | #define VXLAN_HEADROOM (4 + 20 + 8 + 8) | |
55 | ||
56 | #define VXLAN_FLAGS 0x08000000 /* struct vxlanhdr.vx_flags required value. */ | |
57 | ||
58 | /* VXLAN protocol header */ | |
59 | struct vxlanhdr { | |
60 | __be32 vx_flags; | |
61 | __be32 vx_vni; | |
62 | }; | |
63 | ||
64 | /* UDP port for VXLAN traffic. */ | |
65 | static unsigned int vxlan_port __read_mostly = 8472; | |
66 | module_param_named(udp_port, vxlan_port, uint, 0444); | |
67 | MODULE_PARM_DESC(udp_port, "Destination UDP port"); | |
68 | ||
69 | static bool log_ecn_error = true; | |
70 | module_param(log_ecn_error, bool, 0644); | |
71 | MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); | |
72 | ||
73 | /* per-net private data for this module */ | |
74 | static unsigned int vxlan_net_id; | |
75 | struct vxlan_net { | |
76 | struct socket *sock; /* UDP encap socket */ | |
77 | struct hlist_head vni_list[VNI_HASH_SIZE]; | |
78 | }; | |
79 | ||
80 | /* Forwarding table entry */ | |
81 | struct vxlan_fdb { | |
82 | struct hlist_node hlist; /* linked list of entries */ | |
83 | struct rcu_head rcu; | |
84 | unsigned long updated; /* jiffies */ | |
85 | unsigned long used; | |
86 | __be32 remote_ip; | |
87 | u16 state; /* see ndm_state */ | |
88 | u8 eth_addr[ETH_ALEN]; | |
89 | }; | |
90 | ||
91 | /* Per-cpu network traffic stats */ | |
92 | struct vxlan_stats { | |
93 | u64 rx_packets; | |
94 | u64 rx_bytes; | |
95 | u64 tx_packets; | |
96 | u64 tx_bytes; | |
97 | struct u64_stats_sync syncp; | |
98 | }; | |
99 | ||
100 | /* Pseudo network device */ | |
101 | struct vxlan_dev { | |
102 | struct hlist_node hlist; | |
103 | struct net_device *dev; | |
104 | struct vxlan_stats __percpu *stats; | |
105 | __u32 vni; /* virtual network id */ | |
106 | __be32 gaddr; /* multicast group */ | |
107 | __be32 saddr; /* source address */ | |
108 | unsigned int link; /* link to multicast over */ | |
109 | __u8 tos; /* TOS override */ | |
110 | __u8 ttl; | |
111 | bool learn; | |
112 | ||
113 | unsigned long age_interval; | |
114 | struct timer_list age_timer; | |
115 | spinlock_t hash_lock; | |
116 | unsigned int addrcnt; | |
117 | unsigned int addrmax; | |
118 | unsigned int addrexceeded; | |
119 | ||
120 | struct hlist_head fdb_head[FDB_HASH_SIZE]; | |
121 | }; | |
122 | ||
123 | /* salt for hash table */ | |
124 | static u32 vxlan_salt __read_mostly; | |
125 | ||
126 | static inline struct hlist_head *vni_head(struct net *net, u32 id) | |
127 | { | |
128 | struct vxlan_net *vn = net_generic(net, vxlan_net_id); | |
129 | ||
130 | return &vn->vni_list[hash_32(id, VNI_HASH_BITS)]; | |
131 | } | |
132 | ||
133 | /* Look up VNI in a per net namespace table */ | |
134 | static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id) | |
135 | { | |
136 | struct vxlan_dev *vxlan; | |
137 | struct hlist_node *node; | |
138 | ||
139 | hlist_for_each_entry_rcu(vxlan, node, vni_head(net, id), hlist) { | |
140 | if (vxlan->vni == id) | |
141 | return vxlan; | |
142 | } | |
143 | ||
144 | return NULL; | |
145 | } | |
146 | ||
147 | /* Fill in neighbour message in skbuff. */ | |
148 | static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan, | |
149 | const struct vxlan_fdb *fdb, | |
150 | u32 portid, u32 seq, int type, unsigned int flags) | |
151 | { | |
152 | unsigned long now = jiffies; | |
153 | struct nda_cacheinfo ci; | |
154 | struct nlmsghdr *nlh; | |
155 | struct ndmsg *ndm; | |
156 | ||
157 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags); | |
158 | if (nlh == NULL) | |
159 | return -EMSGSIZE; | |
160 | ||
161 | ndm = nlmsg_data(nlh); | |
162 | memset(ndm, 0, sizeof(*ndm)); | |
163 | ndm->ndm_family = AF_BRIDGE; | |
164 | ndm->ndm_state = fdb->state; | |
165 | ndm->ndm_ifindex = vxlan->dev->ifindex; | |
166 | ndm->ndm_flags = NTF_SELF; | |
167 | ndm->ndm_type = NDA_DST; | |
168 | ||
169 | if (nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr)) | |
170 | goto nla_put_failure; | |
171 | ||
172 | if (nla_put_be32(skb, NDA_DST, fdb->remote_ip)) | |
173 | goto nla_put_failure; | |
174 | ||
175 | ci.ndm_used = jiffies_to_clock_t(now - fdb->used); | |
176 | ci.ndm_confirmed = 0; | |
177 | ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated); | |
178 | ci.ndm_refcnt = 0; | |
179 | ||
180 | if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci)) | |
181 | goto nla_put_failure; | |
182 | ||
183 | return nlmsg_end(skb, nlh); | |
184 | ||
185 | nla_put_failure: | |
186 | nlmsg_cancel(skb, nlh); | |
187 | return -EMSGSIZE; | |
188 | } | |
189 | ||
190 | static inline size_t vxlan_nlmsg_size(void) | |
191 | { | |
192 | return NLMSG_ALIGN(sizeof(struct ndmsg)) | |
193 | + nla_total_size(ETH_ALEN) /* NDA_LLADDR */ | |
194 | + nla_total_size(sizeof(__be32)) /* NDA_DST */ | |
195 | + nla_total_size(sizeof(struct nda_cacheinfo)); | |
196 | } | |
197 | ||
198 | static void vxlan_fdb_notify(struct vxlan_dev *vxlan, | |
199 | const struct vxlan_fdb *fdb, int type) | |
200 | { | |
201 | struct net *net = dev_net(vxlan->dev); | |
202 | struct sk_buff *skb; | |
203 | int err = -ENOBUFS; | |
204 | ||
205 | skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC); | |
206 | if (skb == NULL) | |
207 | goto errout; | |
208 | ||
209 | err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0); | |
210 | if (err < 0) { | |
211 | /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */ | |
212 | WARN_ON(err == -EMSGSIZE); | |
213 | kfree_skb(skb); | |
214 | goto errout; | |
215 | } | |
216 | ||
217 | rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); | |
218 | return; | |
219 | errout: | |
220 | if (err < 0) | |
221 | rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); | |
222 | } | |
223 | ||
224 | /* Hash Ethernet address */ | |
225 | static u32 eth_hash(const unsigned char *addr) | |
226 | { | |
227 | u64 value = get_unaligned((u64 *)addr); | |
228 | ||
229 | /* only want 6 bytes */ | |
230 | #ifdef __BIG_ENDIAN | |
231 | value <<= 16; | |
232 | #else | |
233 | value >>= 16; | |
234 | #endif | |
235 | return hash_64(value, FDB_HASH_BITS); | |
236 | } | |
237 | ||
238 | /* Hash chain to use given mac address */ | |
239 | static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan, | |
240 | const u8 *mac) | |
241 | { | |
242 | return &vxlan->fdb_head[eth_hash(mac)]; | |
243 | } | |
244 | ||
245 | /* Look up Ethernet address in forwarding table */ | |
246 | static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan, | |
247 | const u8 *mac) | |
248 | ||
249 | { | |
250 | struct hlist_head *head = vxlan_fdb_head(vxlan, mac); | |
251 | struct vxlan_fdb *f; | |
252 | struct hlist_node *node; | |
253 | ||
254 | hlist_for_each_entry_rcu(f, node, head, hlist) { | |
255 | if (compare_ether_addr(mac, f->eth_addr) == 0) | |
256 | return f; | |
257 | } | |
258 | ||
259 | return NULL; | |
260 | } | |
261 | ||
262 | /* Add new entry to forwarding table -- assumes lock held */ | |
263 | static int vxlan_fdb_create(struct vxlan_dev *vxlan, | |
264 | const u8 *mac, __be32 ip, | |
265 | __u16 state, __u16 flags) | |
266 | { | |
267 | struct vxlan_fdb *f; | |
268 | int notify = 0; | |
269 | ||
270 | f = vxlan_find_mac(vxlan, mac); | |
271 | if (f) { | |
272 | if (flags & NLM_F_EXCL) { | |
273 | netdev_dbg(vxlan->dev, | |
274 | "lost race to create %pM\n", mac); | |
275 | return -EEXIST; | |
276 | } | |
277 | if (f->state != state) { | |
278 | f->state = state; | |
279 | f->updated = jiffies; | |
280 | notify = 1; | |
281 | } | |
282 | } else { | |
283 | if (!(flags & NLM_F_CREATE)) | |
284 | return -ENOENT; | |
285 | ||
286 | if (vxlan->addrmax && vxlan->addrcnt >= vxlan->addrmax) | |
287 | return -ENOSPC; | |
288 | ||
289 | netdev_dbg(vxlan->dev, "add %pM -> %pI4\n", mac, &ip); | |
290 | f = kmalloc(sizeof(*f), GFP_ATOMIC); | |
291 | if (!f) | |
292 | return -ENOMEM; | |
293 | ||
294 | notify = 1; | |
295 | f->remote_ip = ip; | |
296 | f->state = state; | |
297 | f->updated = f->used = jiffies; | |
298 | memcpy(f->eth_addr, mac, ETH_ALEN); | |
299 | ||
300 | ++vxlan->addrcnt; | |
301 | hlist_add_head_rcu(&f->hlist, | |
302 | vxlan_fdb_head(vxlan, mac)); | |
303 | } | |
304 | ||
305 | if (notify) | |
306 | vxlan_fdb_notify(vxlan, f, RTM_NEWNEIGH); | |
307 | ||
308 | return 0; | |
309 | } | |
310 | ||
311 | static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f) | |
312 | { | |
313 | netdev_dbg(vxlan->dev, | |
314 | "delete %pM\n", f->eth_addr); | |
315 | ||
316 | --vxlan->addrcnt; | |
317 | vxlan_fdb_notify(vxlan, f, RTM_DELNEIGH); | |
318 | ||
319 | hlist_del_rcu(&f->hlist); | |
320 | kfree_rcu(f, rcu); | |
321 | } | |
322 | ||
323 | /* Add static entry (via netlink) */ | |
324 | static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], | |
325 | struct net_device *dev, | |
326 | const unsigned char *addr, u16 flags) | |
327 | { | |
328 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
329 | __be32 ip; | |
330 | int err; | |
331 | ||
332 | if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) { | |
333 | pr_info("RTM_NEWNEIGH with invalid state %#x\n", | |
334 | ndm->ndm_state); | |
335 | return -EINVAL; | |
336 | } | |
337 | ||
338 | if (tb[NDA_DST] == NULL) | |
339 | return -EINVAL; | |
340 | ||
341 | if (nla_len(tb[NDA_DST]) != sizeof(__be32)) | |
342 | return -EAFNOSUPPORT; | |
343 | ||
344 | ip = nla_get_be32(tb[NDA_DST]); | |
345 | ||
346 | spin_lock_bh(&vxlan->hash_lock); | |
347 | err = vxlan_fdb_create(vxlan, addr, ip, ndm->ndm_state, flags); | |
348 | spin_unlock_bh(&vxlan->hash_lock); | |
349 | ||
350 | return err; | |
351 | } | |
352 | ||
353 | /* Delete entry (via netlink) */ | |
354 | static int vxlan_fdb_delete(struct ndmsg *ndm, struct net_device *dev, | |
355 | const unsigned char *addr) | |
356 | { | |
357 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
358 | struct vxlan_fdb *f; | |
359 | int err = -ENOENT; | |
360 | ||
361 | spin_lock_bh(&vxlan->hash_lock); | |
362 | f = vxlan_find_mac(vxlan, addr); | |
363 | if (f) { | |
364 | vxlan_fdb_destroy(vxlan, f); | |
365 | err = 0; | |
366 | } | |
367 | spin_unlock_bh(&vxlan->hash_lock); | |
368 | ||
369 | return err; | |
370 | } | |
371 | ||
372 | /* Dump forwarding table */ | |
373 | static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb, | |
374 | struct net_device *dev, int idx) | |
375 | { | |
376 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
377 | unsigned int h; | |
378 | ||
379 | for (h = 0; h < FDB_HASH_SIZE; ++h) { | |
380 | struct vxlan_fdb *f; | |
381 | struct hlist_node *n; | |
382 | int err; | |
383 | ||
384 | hlist_for_each_entry_rcu(f, n, &vxlan->fdb_head[h], hlist) { | |
385 | if (idx < cb->args[0]) | |
386 | goto skip; | |
387 | ||
388 | err = vxlan_fdb_info(skb, vxlan, f, | |
389 | NETLINK_CB(cb->skb).portid, | |
390 | cb->nlh->nlmsg_seq, | |
391 | RTM_NEWNEIGH, | |
392 | NLM_F_MULTI); | |
393 | if (err < 0) | |
394 | break; | |
395 | skip: | |
396 | ++idx; | |
397 | } | |
398 | } | |
399 | ||
400 | return idx; | |
401 | } | |
402 | ||
403 | /* Watch incoming packets to learn mapping between Ethernet address | |
404 | * and Tunnel endpoint. | |
405 | */ | |
406 | static void vxlan_snoop(struct net_device *dev, | |
407 | __be32 src_ip, const u8 *src_mac) | |
408 | { | |
409 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
410 | struct vxlan_fdb *f; | |
411 | int err; | |
412 | ||
413 | f = vxlan_find_mac(vxlan, src_mac); | |
414 | if (likely(f)) { | |
415 | f->used = jiffies; | |
416 | if (likely(f->remote_ip == src_ip)) | |
417 | return; | |
418 | ||
419 | if (net_ratelimit()) | |
420 | netdev_info(dev, | |
421 | "%pM migrated from %pI4 to %pI4\n", | |
422 | src_mac, &f->remote_ip, &src_ip); | |
423 | ||
424 | f->remote_ip = src_ip; | |
425 | f->updated = jiffies; | |
426 | } else { | |
427 | /* learned new entry */ | |
428 | spin_lock(&vxlan->hash_lock); | |
429 | err = vxlan_fdb_create(vxlan, src_mac, src_ip, | |
430 | NUD_REACHABLE, | |
431 | NLM_F_EXCL|NLM_F_CREATE); | |
432 | spin_unlock(&vxlan->hash_lock); | |
433 | } | |
434 | } | |
435 | ||
436 | ||
437 | /* See if multicast group is already in use by other ID */ | |
438 | static bool vxlan_group_used(struct vxlan_net *vn, | |
439 | const struct vxlan_dev *this) | |
440 | { | |
441 | const struct vxlan_dev *vxlan; | |
442 | struct hlist_node *node; | |
443 | unsigned h; | |
444 | ||
445 | for (h = 0; h < VNI_HASH_SIZE; ++h) | |
446 | hlist_for_each_entry(vxlan, node, &vn->vni_list[h], hlist) { | |
447 | if (vxlan == this) | |
448 | continue; | |
449 | ||
450 | if (!netif_running(vxlan->dev)) | |
451 | continue; | |
452 | ||
453 | if (vxlan->gaddr == this->gaddr) | |
454 | return true; | |
455 | } | |
456 | ||
457 | return false; | |
458 | } | |
459 | ||
460 | /* kernel equivalent to IP_ADD_MEMBERSHIP */ | |
461 | static int vxlan_join_group(struct net_device *dev) | |
462 | { | |
463 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
464 | struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id); | |
465 | struct sock *sk = vn->sock->sk; | |
466 | struct ip_mreqn mreq = { | |
467 | .imr_multiaddr.s_addr = vxlan->gaddr, | |
468 | }; | |
469 | int err; | |
470 | ||
471 | /* Already a member of group */ | |
472 | if (vxlan_group_used(vn, vxlan)) | |
473 | return 0; | |
474 | ||
475 | /* Need to drop RTNL to call multicast join */ | |
476 | rtnl_unlock(); | |
477 | lock_sock(sk); | |
478 | err = ip_mc_join_group(sk, &mreq); | |
479 | release_sock(sk); | |
480 | rtnl_lock(); | |
481 | ||
482 | return err; | |
483 | } | |
484 | ||
485 | ||
486 | /* kernel equivalent to IP_DROP_MEMBERSHIP */ | |
487 | static int vxlan_leave_group(struct net_device *dev) | |
488 | { | |
489 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
490 | struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id); | |
491 | int err = 0; | |
492 | struct sock *sk = vn->sock->sk; | |
493 | struct ip_mreqn mreq = { | |
494 | .imr_multiaddr.s_addr = vxlan->gaddr, | |
495 | }; | |
496 | ||
497 | /* Only leave group when last vxlan is done. */ | |
498 | if (vxlan_group_used(vn, vxlan)) | |
499 | return 0; | |
500 | ||
501 | /* Need to drop RTNL to call multicast leave */ | |
502 | rtnl_unlock(); | |
503 | lock_sock(sk); | |
504 | err = ip_mc_leave_group(sk, &mreq); | |
505 | release_sock(sk); | |
506 | rtnl_lock(); | |
507 | ||
508 | return err; | |
509 | } | |
510 | ||
511 | /* Callback from net/ipv4/udp.c to receive packets */ | |
512 | static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb) | |
513 | { | |
514 | struct iphdr *oip; | |
515 | struct vxlanhdr *vxh; | |
516 | struct vxlan_dev *vxlan; | |
517 | struct vxlan_stats *stats; | |
518 | __u32 vni; | |
519 | int err; | |
520 | ||
521 | /* pop off outer UDP header */ | |
522 | __skb_pull(skb, sizeof(struct udphdr)); | |
523 | ||
524 | /* Need Vxlan and inner Ethernet header to be present */ | |
525 | if (!pskb_may_pull(skb, sizeof(struct vxlanhdr))) | |
526 | goto error; | |
527 | ||
528 | /* Drop packets with reserved bits set */ | |
529 | vxh = (struct vxlanhdr *) skb->data; | |
530 | if (vxh->vx_flags != htonl(VXLAN_FLAGS) || | |
531 | (vxh->vx_vni & htonl(0xff))) { | |
532 | netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n", | |
533 | ntohl(vxh->vx_flags), ntohl(vxh->vx_vni)); | |
534 | goto error; | |
535 | } | |
536 | ||
537 | __skb_pull(skb, sizeof(struct vxlanhdr)); | |
538 | skb_postpull_rcsum(skb, eth_hdr(skb), sizeof(struct vxlanhdr)); | |
539 | ||
540 | /* Is this VNI defined? */ | |
541 | vni = ntohl(vxh->vx_vni) >> 8; | |
542 | vxlan = vxlan_find_vni(sock_net(sk), vni); | |
543 | if (!vxlan) { | |
544 | netdev_dbg(skb->dev, "unknown vni %d\n", vni); | |
545 | goto drop; | |
546 | } | |
547 | ||
548 | if (!pskb_may_pull(skb, ETH_HLEN)) { | |
549 | vxlan->dev->stats.rx_length_errors++; | |
550 | vxlan->dev->stats.rx_errors++; | |
551 | goto drop; | |
552 | } | |
553 | ||
554 | /* Re-examine inner Ethernet packet */ | |
555 | oip = ip_hdr(skb); | |
556 | skb->protocol = eth_type_trans(skb, vxlan->dev); | |
557 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); | |
558 | ||
559 | /* Ignore packet loops (and multicast echo) */ | |
560 | if (compare_ether_addr(eth_hdr(skb)->h_source, | |
561 | vxlan->dev->dev_addr) == 0) | |
562 | goto drop; | |
563 | ||
564 | if (vxlan->learn) | |
565 | vxlan_snoop(skb->dev, oip->saddr, eth_hdr(skb)->h_source); | |
566 | ||
567 | __skb_tunnel_rx(skb, vxlan->dev); | |
568 | skb_reset_network_header(skb); | |
569 | ||
570 | err = IP_ECN_decapsulate(oip, skb); | |
571 | if (unlikely(err)) { | |
572 | if (log_ecn_error) | |
573 | net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", | |
574 | &oip->saddr, oip->tos); | |
575 | if (err > 1) { | |
576 | ++vxlan->dev->stats.rx_frame_errors; | |
577 | ++vxlan->dev->stats.rx_errors; | |
578 | goto drop; | |
579 | } | |
580 | } | |
581 | ||
582 | stats = this_cpu_ptr(vxlan->stats); | |
583 | u64_stats_update_begin(&stats->syncp); | |
584 | stats->rx_packets++; | |
585 | stats->rx_bytes += skb->len; | |
586 | u64_stats_update_end(&stats->syncp); | |
587 | ||
588 | netif_rx(skb); | |
589 | ||
590 | return 0; | |
591 | error: | |
592 | /* Put UDP header back */ | |
593 | __skb_push(skb, sizeof(struct udphdr)); | |
594 | ||
595 | return 1; | |
596 | drop: | |
597 | /* Consume bad packet */ | |
598 | kfree_skb(skb); | |
599 | return 0; | |
600 | } | |
601 | ||
602 | /* Extract dsfield from inner protocol */ | |
603 | static inline u8 vxlan_get_dsfield(const struct iphdr *iph, | |
604 | const struct sk_buff *skb) | |
605 | { | |
606 | if (skb->protocol == htons(ETH_P_IP)) | |
607 | return iph->tos; | |
608 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
609 | return ipv6_get_dsfield((const struct ipv6hdr *)iph); | |
610 | else | |
611 | return 0; | |
612 | } | |
613 | ||
614 | /* Propogate ECN bits out */ | |
615 | static inline u8 vxlan_ecn_encap(u8 tos, | |
616 | const struct iphdr *iph, | |
617 | const struct sk_buff *skb) | |
618 | { | |
619 | u8 inner = vxlan_get_dsfield(iph, skb); | |
620 | ||
621 | return INET_ECN_encapsulate(tos, inner); | |
622 | } | |
623 | ||
624 | /* Transmit local packets over Vxlan | |
625 | * | |
626 | * Outer IP header inherits ECN and DF from inner header. | |
627 | * Outer UDP destination is the VXLAN assigned port. | |
628 | * source port is based on hash of flow if available | |
629 | * otherwise use a random value | |
630 | */ | |
631 | static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev) | |
632 | { | |
633 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
634 | struct rtable *rt; | |
635 | const struct ethhdr *eth; | |
636 | const struct iphdr *old_iph; | |
637 | struct iphdr *iph; | |
638 | struct vxlanhdr *vxh; | |
639 | struct udphdr *uh; | |
640 | struct flowi4 fl4; | |
641 | struct vxlan_fdb *f; | |
642 | unsigned int pkt_len = skb->len; | |
643 | u32 hash; | |
644 | __be32 dst; | |
645 | __be16 df = 0; | |
646 | __u8 tos, ttl; | |
647 | int err; | |
648 | ||
649 | /* Need space for new headers (invalidates iph ptr) */ | |
650 | if (skb_cow_head(skb, VXLAN_HEADROOM)) | |
651 | goto drop; | |
652 | ||
653 | eth = (void *)skb->data; | |
654 | old_iph = ip_hdr(skb); | |
655 | ||
656 | if (!is_multicast_ether_addr(eth->h_dest) && | |
657 | (f = vxlan_find_mac(vxlan, eth->h_dest))) | |
658 | dst = f->remote_ip; | |
659 | else if (vxlan->gaddr) { | |
660 | dst = vxlan->gaddr; | |
661 | } else | |
662 | goto drop; | |
663 | ||
664 | ttl = vxlan->ttl; | |
665 | if (!ttl && IN_MULTICAST(ntohl(dst))) | |
666 | ttl = 1; | |
667 | ||
668 | tos = vxlan->tos; | |
669 | if (tos == 1) | |
670 | tos = vxlan_get_dsfield(old_iph, skb); | |
671 | ||
672 | hash = skb_get_rxhash(skb); | |
673 | ||
674 | rt = ip_route_output_gre(dev_net(dev), &fl4, dst, | |
675 | vxlan->saddr, vxlan->vni, | |
676 | RT_TOS(tos), vxlan->link); | |
677 | if (IS_ERR(rt)) { | |
678 | netdev_dbg(dev, "no route to %pI4\n", &dst); | |
679 | dev->stats.tx_carrier_errors++; | |
680 | goto tx_error; | |
681 | } | |
682 | ||
683 | if (rt->dst.dev == dev) { | |
684 | netdev_dbg(dev, "circular route to %pI4\n", &dst); | |
685 | ip_rt_put(rt); | |
686 | dev->stats.collisions++; | |
687 | goto tx_error; | |
688 | } | |
689 | ||
690 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); | |
691 | IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED | | |
692 | IPSKB_REROUTED); | |
693 | skb_dst_drop(skb); | |
694 | skb_dst_set(skb, &rt->dst); | |
695 | ||
696 | vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh)); | |
697 | vxh->vx_flags = htonl(VXLAN_FLAGS); | |
698 | vxh->vx_vni = htonl(vxlan->vni << 8); | |
699 | ||
700 | __skb_push(skb, sizeof(*uh)); | |
701 | skb_reset_transport_header(skb); | |
702 | uh = udp_hdr(skb); | |
703 | ||
704 | uh->dest = htons(vxlan_port); | |
705 | uh->source = hash ? :random32(); | |
706 | ||
707 | uh->len = htons(skb->len); | |
708 | uh->check = 0; | |
709 | ||
710 | __skb_push(skb, sizeof(*iph)); | |
711 | skb_reset_network_header(skb); | |
712 | iph = ip_hdr(skb); | |
713 | iph->version = 4; | |
714 | iph->ihl = sizeof(struct iphdr) >> 2; | |
715 | iph->frag_off = df; | |
716 | iph->protocol = IPPROTO_UDP; | |
717 | iph->tos = vxlan_ecn_encap(tos, old_iph, skb); | |
718 | iph->daddr = fl4.daddr; | |
719 | iph->saddr = fl4.saddr; | |
720 | iph->ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); | |
721 | ||
722 | /* See __IPTUNNEL_XMIT */ | |
723 | skb->ip_summed = CHECKSUM_NONE; | |
724 | ip_select_ident(iph, &rt->dst, NULL); | |
725 | ||
726 | err = ip_local_out(skb); | |
727 | if (likely(net_xmit_eval(err) == 0)) { | |
728 | struct vxlan_stats *stats = this_cpu_ptr(vxlan->stats); | |
729 | ||
730 | u64_stats_update_begin(&stats->syncp); | |
731 | stats->tx_packets++; | |
732 | stats->tx_bytes += pkt_len; | |
733 | u64_stats_update_end(&stats->syncp); | |
734 | } else { | |
735 | dev->stats.tx_errors++; | |
736 | dev->stats.tx_aborted_errors++; | |
737 | } | |
738 | return NETDEV_TX_OK; | |
739 | ||
740 | drop: | |
741 | dev->stats.tx_dropped++; | |
742 | goto tx_free; | |
743 | ||
744 | tx_error: | |
745 | dev->stats.tx_errors++; | |
746 | tx_free: | |
747 | dev_kfree_skb(skb); | |
748 | return NETDEV_TX_OK; | |
749 | } | |
750 | ||
751 | /* Walk the forwarding table and purge stale entries */ | |
752 | static void vxlan_cleanup(unsigned long arg) | |
753 | { | |
754 | struct vxlan_dev *vxlan = (struct vxlan_dev *) arg; | |
755 | unsigned long next_timer = jiffies + FDB_AGE_INTERVAL; | |
756 | unsigned int h; | |
757 | ||
758 | if (!netif_running(vxlan->dev)) | |
759 | return; | |
760 | ||
761 | spin_lock_bh(&vxlan->hash_lock); | |
762 | for (h = 0; h < FDB_HASH_SIZE; ++h) { | |
763 | struct hlist_node *p, *n; | |
764 | hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) { | |
765 | struct vxlan_fdb *f | |
766 | = container_of(p, struct vxlan_fdb, hlist); | |
767 | unsigned long timeout; | |
768 | ||
769 | if (f->state == NUD_PERMANENT) | |
770 | continue; | |
771 | ||
772 | timeout = f->used + vxlan->age_interval * HZ; | |
773 | if (time_before_eq(timeout, jiffies)) { | |
774 | netdev_dbg(vxlan->dev, | |
775 | "garbage collect %pM\n", | |
776 | f->eth_addr); | |
777 | f->state = NUD_STALE; | |
778 | vxlan_fdb_destroy(vxlan, f); | |
779 | } else if (time_before(timeout, next_timer)) | |
780 | next_timer = timeout; | |
781 | } | |
782 | } | |
783 | spin_unlock_bh(&vxlan->hash_lock); | |
784 | ||
785 | mod_timer(&vxlan->age_timer, next_timer); | |
786 | } | |
787 | ||
788 | /* Setup stats when device is created */ | |
789 | static int vxlan_init(struct net_device *dev) | |
790 | { | |
791 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
792 | ||
793 | vxlan->stats = alloc_percpu(struct vxlan_stats); | |
794 | if (!vxlan->stats) | |
795 | return -ENOMEM; | |
796 | ||
797 | return 0; | |
798 | } | |
799 | ||
800 | /* Start ageing timer and join group when device is brought up */ | |
801 | static int vxlan_open(struct net_device *dev) | |
802 | { | |
803 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
804 | int err; | |
805 | ||
806 | if (vxlan->gaddr) { | |
807 | err = vxlan_join_group(dev); | |
808 | if (err) | |
809 | return err; | |
810 | } | |
811 | ||
812 | if (vxlan->age_interval) | |
813 | mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL); | |
814 | ||
815 | return 0; | |
816 | } | |
817 | ||
818 | /* Purge the forwarding table */ | |
819 | static void vxlan_flush(struct vxlan_dev *vxlan) | |
820 | { | |
821 | unsigned h; | |
822 | ||
823 | spin_lock_bh(&vxlan->hash_lock); | |
824 | for (h = 0; h < FDB_HASH_SIZE; ++h) { | |
825 | struct hlist_node *p, *n; | |
826 | hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) { | |
827 | struct vxlan_fdb *f | |
828 | = container_of(p, struct vxlan_fdb, hlist); | |
829 | vxlan_fdb_destroy(vxlan, f); | |
830 | } | |
831 | } | |
832 | spin_unlock_bh(&vxlan->hash_lock); | |
833 | } | |
834 | ||
835 | /* Cleanup timer and forwarding table on shutdown */ | |
836 | static int vxlan_stop(struct net_device *dev) | |
837 | { | |
838 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
839 | ||
840 | if (vxlan->gaddr) | |
841 | vxlan_leave_group(dev); | |
842 | ||
843 | del_timer_sync(&vxlan->age_timer); | |
844 | ||
845 | vxlan_flush(vxlan); | |
846 | ||
847 | return 0; | |
848 | } | |
849 | ||
850 | /* Merge per-cpu statistics */ | |
851 | static struct rtnl_link_stats64 *vxlan_stats64(struct net_device *dev, | |
852 | struct rtnl_link_stats64 *stats) | |
853 | { | |
854 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
855 | struct vxlan_stats tmp, sum = { 0 }; | |
856 | unsigned int cpu; | |
857 | ||
858 | for_each_possible_cpu(cpu) { | |
859 | unsigned int start; | |
860 | const struct vxlan_stats *stats | |
861 | = per_cpu_ptr(vxlan->stats, cpu); | |
862 | ||
863 | do { | |
864 | start = u64_stats_fetch_begin_bh(&stats->syncp); | |
865 | memcpy(&tmp, stats, sizeof(tmp)); | |
866 | } while (u64_stats_fetch_retry_bh(&stats->syncp, start)); | |
867 | ||
868 | sum.tx_bytes += tmp.tx_bytes; | |
869 | sum.tx_packets += tmp.tx_packets; | |
870 | sum.rx_bytes += tmp.rx_bytes; | |
871 | sum.rx_packets += tmp.rx_packets; | |
872 | } | |
873 | ||
874 | stats->tx_bytes = sum.tx_bytes; | |
875 | stats->tx_packets = sum.tx_packets; | |
876 | stats->rx_bytes = sum.rx_bytes; | |
877 | stats->rx_packets = sum.rx_packets; | |
878 | ||
879 | stats->multicast = dev->stats.multicast; | |
880 | stats->rx_length_errors = dev->stats.rx_length_errors; | |
881 | stats->rx_frame_errors = dev->stats.rx_frame_errors; | |
882 | stats->rx_errors = dev->stats.rx_errors; | |
883 | ||
884 | stats->tx_dropped = dev->stats.tx_dropped; | |
885 | stats->tx_carrier_errors = dev->stats.tx_carrier_errors; | |
886 | stats->tx_aborted_errors = dev->stats.tx_aborted_errors; | |
887 | stats->collisions = dev->stats.collisions; | |
888 | stats->tx_errors = dev->stats.tx_errors; | |
889 | ||
890 | return stats; | |
891 | } | |
892 | ||
893 | /* Stub, nothing needs to be done. */ | |
894 | static void vxlan_set_multicast_list(struct net_device *dev) | |
895 | { | |
896 | } | |
897 | ||
898 | static const struct net_device_ops vxlan_netdev_ops = { | |
899 | .ndo_init = vxlan_init, | |
900 | .ndo_open = vxlan_open, | |
901 | .ndo_stop = vxlan_stop, | |
902 | .ndo_start_xmit = vxlan_xmit, | |
903 | .ndo_get_stats64 = vxlan_stats64, | |
904 | .ndo_set_rx_mode = vxlan_set_multicast_list, | |
905 | .ndo_change_mtu = eth_change_mtu, | |
906 | .ndo_validate_addr = eth_validate_addr, | |
907 | .ndo_set_mac_address = eth_mac_addr, | |
908 | .ndo_fdb_add = vxlan_fdb_add, | |
909 | .ndo_fdb_del = vxlan_fdb_delete, | |
910 | .ndo_fdb_dump = vxlan_fdb_dump, | |
911 | }; | |
912 | ||
913 | /* Info for udev, that this is a virtual tunnel endpoint */ | |
914 | static struct device_type vxlan_type = { | |
915 | .name = "vxlan", | |
916 | }; | |
917 | ||
918 | static void vxlan_free(struct net_device *dev) | |
919 | { | |
920 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
921 | ||
922 | free_percpu(vxlan->stats); | |
923 | free_netdev(dev); | |
924 | } | |
925 | ||
926 | /* Initialize the device structure. */ | |
927 | static void vxlan_setup(struct net_device *dev) | |
928 | { | |
929 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
930 | unsigned h; | |
931 | ||
932 | eth_hw_addr_random(dev); | |
933 | ether_setup(dev); | |
934 | ||
935 | dev->netdev_ops = &vxlan_netdev_ops; | |
936 | dev->destructor = vxlan_free; | |
937 | SET_NETDEV_DEVTYPE(dev, &vxlan_type); | |
938 | ||
939 | dev->tx_queue_len = 0; | |
940 | dev->features |= NETIF_F_LLTX; | |
941 | dev->features |= NETIF_F_NETNS_LOCAL; | |
942 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; | |
943 | ||
944 | spin_lock_init(&vxlan->hash_lock); | |
945 | ||
946 | init_timer_deferrable(&vxlan->age_timer); | |
947 | vxlan->age_timer.function = vxlan_cleanup; | |
948 | vxlan->age_timer.data = (unsigned long) vxlan; | |
949 | ||
950 | vxlan->dev = dev; | |
951 | ||
952 | for (h = 0; h < FDB_HASH_SIZE; ++h) | |
953 | INIT_HLIST_HEAD(&vxlan->fdb_head[h]); | |
954 | } | |
955 | ||
956 | static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = { | |
957 | [IFLA_VXLAN_ID] = { .type = NLA_U32 }, | |
958 | [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) }, | |
959 | [IFLA_VXLAN_LINK] = { .type = NLA_U32 }, | |
960 | [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) }, | |
961 | [IFLA_VXLAN_TOS] = { .type = NLA_U8 }, | |
962 | [IFLA_VXLAN_TTL] = { .type = NLA_U8 }, | |
963 | [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 }, | |
964 | [IFLA_VXLAN_AGEING] = { .type = NLA_U32 }, | |
965 | [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 }, | |
966 | }; | |
967 | ||
968 | static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[]) | |
969 | { | |
970 | if (tb[IFLA_ADDRESS]) { | |
971 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { | |
972 | pr_debug("invalid link address (not ethernet)\n"); | |
973 | return -EINVAL; | |
974 | } | |
975 | ||
976 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { | |
977 | pr_debug("invalid all zero ethernet address\n"); | |
978 | return -EADDRNOTAVAIL; | |
979 | } | |
980 | } | |
981 | ||
982 | if (!data) | |
983 | return -EINVAL; | |
984 | ||
985 | if (data[IFLA_VXLAN_ID]) { | |
986 | __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]); | |
987 | if (id >= VXLAN_VID_MASK) | |
988 | return -ERANGE; | |
989 | } | |
990 | ||
991 | if (data[IFLA_VXLAN_GROUP]) { | |
992 | __be32 gaddr = nla_get_be32(data[IFLA_VXLAN_GROUP]); | |
993 | if (!IN_MULTICAST(ntohl(gaddr))) { | |
994 | pr_debug("group address is not IPv4 multicast\n"); | |
995 | return -EADDRNOTAVAIL; | |
996 | } | |
997 | } | |
998 | return 0; | |
999 | } | |
1000 | ||
1001 | static int vxlan_newlink(struct net *net, struct net_device *dev, | |
1002 | struct nlattr *tb[], struct nlattr *data[]) | |
1003 | { | |
1004 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1005 | __u32 vni; | |
1006 | int err; | |
1007 | ||
1008 | if (!data[IFLA_VXLAN_ID]) | |
1009 | return -EINVAL; | |
1010 | ||
1011 | vni = nla_get_u32(data[IFLA_VXLAN_ID]); | |
1012 | if (vxlan_find_vni(net, vni)) { | |
1013 | pr_info("duplicate VNI %u\n", vni); | |
1014 | return -EEXIST; | |
1015 | } | |
1016 | vxlan->vni = vni; | |
1017 | ||
1018 | if (data[IFLA_VXLAN_GROUP]) | |
1019 | vxlan->gaddr = nla_get_be32(data[IFLA_VXLAN_GROUP]); | |
1020 | ||
1021 | if (data[IFLA_VXLAN_LOCAL]) | |
1022 | vxlan->saddr = nla_get_be32(data[IFLA_VXLAN_LOCAL]); | |
1023 | ||
1024 | if (data[IFLA_VXLAN_LINK]) { | |
1025 | vxlan->link = nla_get_u32(data[IFLA_VXLAN_LINK]); | |
1026 | ||
1027 | if (!tb[IFLA_MTU]) { | |
1028 | struct net_device *lowerdev; | |
1029 | lowerdev = __dev_get_by_index(net, vxlan->link); | |
1030 | dev->mtu = lowerdev->mtu - VXLAN_HEADROOM; | |
1031 | } | |
1032 | } | |
1033 | ||
1034 | if (data[IFLA_VXLAN_TOS]) | |
1035 | vxlan->tos = nla_get_u8(data[IFLA_VXLAN_TOS]); | |
1036 | ||
1037 | if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING])) | |
1038 | vxlan->learn = true; | |
1039 | ||
1040 | if (data[IFLA_VXLAN_AGEING]) | |
1041 | vxlan->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]); | |
1042 | else | |
1043 | vxlan->age_interval = FDB_AGE_DEFAULT; | |
1044 | ||
1045 | if (data[IFLA_VXLAN_LIMIT]) | |
1046 | vxlan->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]); | |
1047 | ||
1048 | err = register_netdevice(dev); | |
1049 | if (!err) | |
1050 | hlist_add_head_rcu(&vxlan->hlist, vni_head(net, vxlan->vni)); | |
1051 | ||
1052 | return err; | |
1053 | } | |
1054 | ||
1055 | static void vxlan_dellink(struct net_device *dev, struct list_head *head) | |
1056 | { | |
1057 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1058 | ||
1059 | hlist_del_rcu(&vxlan->hlist); | |
1060 | ||
1061 | unregister_netdevice_queue(dev, head); | |
1062 | } | |
1063 | ||
1064 | static size_t vxlan_get_size(const struct net_device *dev) | |
1065 | { | |
1066 | ||
1067 | return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */ | |
1068 | nla_total_size(sizeof(__be32)) +/* IFLA_VXLAN_GROUP */ | |
1069 | nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */ | |
1070 | nla_total_size(sizeof(__be32))+ /* IFLA_VXLAN_LOCAL */ | |
1071 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */ | |
1072 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */ | |
1073 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */ | |
1074 | nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */ | |
1075 | nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */ | |
1076 | 0; | |
1077 | } | |
1078 | ||
1079 | static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
1080 | { | |
1081 | const struct vxlan_dev *vxlan = netdev_priv(dev); | |
1082 | ||
1083 | if (nla_put_u32(skb, IFLA_VXLAN_ID, vxlan->vni)) | |
1084 | goto nla_put_failure; | |
1085 | ||
7c41c42c | 1086 | if (vxlan->gaddr && nla_put_be32(skb, IFLA_VXLAN_GROUP, vxlan->gaddr)) |
d342894c | 1087 | goto nla_put_failure; |
1088 | ||
1089 | if (vxlan->link && nla_put_u32(skb, IFLA_VXLAN_LINK, vxlan->link)) | |
1090 | goto nla_put_failure; | |
1091 | ||
7c41c42c | 1092 | if (vxlan->saddr && nla_put_be32(skb, IFLA_VXLAN_LOCAL, vxlan->saddr)) |
d342894c | 1093 | goto nla_put_failure; |
1094 | ||
1095 | if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->ttl) || | |
1096 | nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->tos) || | |
1097 | nla_put_u8(skb, IFLA_VXLAN_LEARNING, vxlan->learn) || | |
1098 | nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->age_interval) || | |
1099 | nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->addrmax)) | |
1100 | goto nla_put_failure; | |
1101 | ||
1102 | return 0; | |
1103 | ||
1104 | nla_put_failure: | |
1105 | return -EMSGSIZE; | |
1106 | } | |
1107 | ||
1108 | static struct rtnl_link_ops vxlan_link_ops __read_mostly = { | |
1109 | .kind = "vxlan", | |
1110 | .maxtype = IFLA_VXLAN_MAX, | |
1111 | .policy = vxlan_policy, | |
1112 | .priv_size = sizeof(struct vxlan_dev), | |
1113 | .setup = vxlan_setup, | |
1114 | .validate = vxlan_validate, | |
1115 | .newlink = vxlan_newlink, | |
1116 | .dellink = vxlan_dellink, | |
1117 | .get_size = vxlan_get_size, | |
1118 | .fill_info = vxlan_fill_info, | |
1119 | }; | |
1120 | ||
1121 | static __net_init int vxlan_init_net(struct net *net) | |
1122 | { | |
1123 | struct vxlan_net *vn = net_generic(net, vxlan_net_id); | |
1124 | struct sock *sk; | |
1125 | struct sockaddr_in vxlan_addr = { | |
1126 | .sin_family = AF_INET, | |
1127 | .sin_addr.s_addr = htonl(INADDR_ANY), | |
1128 | }; | |
1129 | int rc; | |
1130 | unsigned h; | |
1131 | ||
1132 | /* Create UDP socket for encapsulation receive. */ | |
1133 | rc = sock_create_kern(AF_INET, SOCK_DGRAM, IPPROTO_UDP, &vn->sock); | |
1134 | if (rc < 0) { | |
1135 | pr_debug("UDP socket create failed\n"); | |
1136 | return rc; | |
1137 | } | |
bfe1b9b1 | 1138 | /* Put in proper namespace */ |
1139 | sk = vn->sock->sk; | |
1140 | sk_change_net(sk, net); | |
d342894c | 1141 | |
1142 | vxlan_addr.sin_port = htons(vxlan_port); | |
1143 | ||
1144 | rc = kernel_bind(vn->sock, (struct sockaddr *) &vxlan_addr, | |
1145 | sizeof(vxlan_addr)); | |
1146 | if (rc < 0) { | |
1147 | pr_debug("bind for UDP socket %pI4:%u (%d)\n", | |
1148 | &vxlan_addr.sin_addr, ntohs(vxlan_addr.sin_port), rc); | |
bfe1b9b1 | 1149 | sk_release_kernel(sk); |
d342894c | 1150 | vn->sock = NULL; |
1151 | return rc; | |
1152 | } | |
1153 | ||
1154 | /* Disable multicast loopback */ | |
d342894c | 1155 | inet_sk(sk)->mc_loop = 0; |
1156 | ||
1157 | /* Mark socket as an encapsulation socket. */ | |
1158 | udp_sk(sk)->encap_type = 1; | |
1159 | udp_sk(sk)->encap_rcv = vxlan_udp_encap_recv; | |
1160 | udp_encap_enable(); | |
1161 | ||
1162 | for (h = 0; h < VNI_HASH_SIZE; ++h) | |
1163 | INIT_HLIST_HEAD(&vn->vni_list[h]); | |
1164 | ||
1165 | return 0; | |
1166 | } | |
1167 | ||
1168 | static __net_exit void vxlan_exit_net(struct net *net) | |
1169 | { | |
1170 | struct vxlan_net *vn = net_generic(net, vxlan_net_id); | |
1171 | ||
1172 | if (vn->sock) { | |
bfe1b9b1 | 1173 | sk_release_kernel(vn->sock->sk); |
d342894c | 1174 | vn->sock = NULL; |
1175 | } | |
1176 | } | |
1177 | ||
1178 | static struct pernet_operations vxlan_net_ops = { | |
1179 | .init = vxlan_init_net, | |
1180 | .exit = vxlan_exit_net, | |
1181 | .id = &vxlan_net_id, | |
1182 | .size = sizeof(struct vxlan_net), | |
1183 | }; | |
1184 | ||
1185 | static int __init vxlan_init_module(void) | |
1186 | { | |
1187 | int rc; | |
1188 | ||
1189 | get_random_bytes(&vxlan_salt, sizeof(vxlan_salt)); | |
1190 | ||
1191 | rc = register_pernet_device(&vxlan_net_ops); | |
1192 | if (rc) | |
1193 | goto out1; | |
1194 | ||
1195 | rc = rtnl_link_register(&vxlan_link_ops); | |
1196 | if (rc) | |
1197 | goto out2; | |
1198 | ||
1199 | return 0; | |
1200 | ||
1201 | out2: | |
1202 | unregister_pernet_device(&vxlan_net_ops); | |
1203 | out1: | |
1204 | return rc; | |
1205 | } | |
1206 | module_init(vxlan_init_module); | |
1207 | ||
1208 | static void __exit vxlan_cleanup_module(void) | |
1209 | { | |
1210 | rtnl_link_unregister(&vxlan_link_ops); | |
1211 | unregister_pernet_device(&vxlan_net_ops); | |
1212 | } | |
1213 | module_exit(vxlan_cleanup_module); | |
1214 | ||
1215 | MODULE_LICENSE("GPL"); | |
1216 | MODULE_VERSION(VXLAN_VERSION); | |
1217 | MODULE_AUTHOR("Stephen Hemminger <shemminger@vyatta.com>"); | |
1218 | MODULE_ALIAS_RTNL_LINK("vxlan"); |