Commit | Line | Data |
---|---|---|
d342894c | 1 | /* |
eb5ce439 | 2 | * VXLAN: Virtual eXtensible Local Area Network |
d342894c | 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) | |
52b702ff AD |
53 | /* IP header + UDP + VXLAN + Ethernet header */ |
54 | #define VXLAN_HEADROOM (20 + 8 + 8 + 14) | |
d342894c | 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 */ | |
05f47d69 | 109 | __u16 port_min; /* source port range */ |
110 | __u16 port_max; | |
d342894c | 111 | __u8 tos; /* TOS override */ |
112 | __u8 ttl; | |
113 | bool learn; | |
114 | ||
115 | unsigned long age_interval; | |
116 | struct timer_list age_timer; | |
117 | spinlock_t hash_lock; | |
118 | unsigned int addrcnt; | |
119 | unsigned int addrmax; | |
120 | unsigned int addrexceeded; | |
121 | ||
122 | struct hlist_head fdb_head[FDB_HASH_SIZE]; | |
123 | }; | |
124 | ||
125 | /* salt for hash table */ | |
126 | static u32 vxlan_salt __read_mostly; | |
127 | ||
128 | static inline struct hlist_head *vni_head(struct net *net, u32 id) | |
129 | { | |
130 | struct vxlan_net *vn = net_generic(net, vxlan_net_id); | |
131 | ||
132 | return &vn->vni_list[hash_32(id, VNI_HASH_BITS)]; | |
133 | } | |
134 | ||
135 | /* Look up VNI in a per net namespace table */ | |
136 | static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id) | |
137 | { | |
138 | struct vxlan_dev *vxlan; | |
139 | struct hlist_node *node; | |
140 | ||
141 | hlist_for_each_entry_rcu(vxlan, node, vni_head(net, id), hlist) { | |
142 | if (vxlan->vni == id) | |
143 | return vxlan; | |
144 | } | |
145 | ||
146 | return NULL; | |
147 | } | |
148 | ||
149 | /* Fill in neighbour message in skbuff. */ | |
150 | static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan, | |
151 | const struct vxlan_fdb *fdb, | |
152 | u32 portid, u32 seq, int type, unsigned int flags) | |
153 | { | |
154 | unsigned long now = jiffies; | |
155 | struct nda_cacheinfo ci; | |
156 | struct nlmsghdr *nlh; | |
157 | struct ndmsg *ndm; | |
158 | ||
159 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags); | |
160 | if (nlh == NULL) | |
161 | return -EMSGSIZE; | |
162 | ||
163 | ndm = nlmsg_data(nlh); | |
164 | memset(ndm, 0, sizeof(*ndm)); | |
165 | ndm->ndm_family = AF_BRIDGE; | |
166 | ndm->ndm_state = fdb->state; | |
167 | ndm->ndm_ifindex = vxlan->dev->ifindex; | |
168 | ndm->ndm_flags = NTF_SELF; | |
169 | ndm->ndm_type = NDA_DST; | |
170 | ||
171 | if (nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr)) | |
172 | goto nla_put_failure; | |
173 | ||
174 | if (nla_put_be32(skb, NDA_DST, fdb->remote_ip)) | |
175 | goto nla_put_failure; | |
176 | ||
177 | ci.ndm_used = jiffies_to_clock_t(now - fdb->used); | |
178 | ci.ndm_confirmed = 0; | |
179 | ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated); | |
180 | ci.ndm_refcnt = 0; | |
181 | ||
182 | if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci)) | |
183 | goto nla_put_failure; | |
184 | ||
185 | return nlmsg_end(skb, nlh); | |
186 | ||
187 | nla_put_failure: | |
188 | nlmsg_cancel(skb, nlh); | |
189 | return -EMSGSIZE; | |
190 | } | |
191 | ||
192 | static inline size_t vxlan_nlmsg_size(void) | |
193 | { | |
194 | return NLMSG_ALIGN(sizeof(struct ndmsg)) | |
195 | + nla_total_size(ETH_ALEN) /* NDA_LLADDR */ | |
196 | + nla_total_size(sizeof(__be32)) /* NDA_DST */ | |
197 | + nla_total_size(sizeof(struct nda_cacheinfo)); | |
198 | } | |
199 | ||
200 | static void vxlan_fdb_notify(struct vxlan_dev *vxlan, | |
201 | const struct vxlan_fdb *fdb, int type) | |
202 | { | |
203 | struct net *net = dev_net(vxlan->dev); | |
204 | struct sk_buff *skb; | |
205 | int err = -ENOBUFS; | |
206 | ||
207 | skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC); | |
208 | if (skb == NULL) | |
209 | goto errout; | |
210 | ||
211 | err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0); | |
212 | if (err < 0) { | |
213 | /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */ | |
214 | WARN_ON(err == -EMSGSIZE); | |
215 | kfree_skb(skb); | |
216 | goto errout; | |
217 | } | |
218 | ||
219 | rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); | |
220 | return; | |
221 | errout: | |
222 | if (err < 0) | |
223 | rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); | |
224 | } | |
225 | ||
226 | /* Hash Ethernet address */ | |
227 | static u32 eth_hash(const unsigned char *addr) | |
228 | { | |
229 | u64 value = get_unaligned((u64 *)addr); | |
230 | ||
231 | /* only want 6 bytes */ | |
232 | #ifdef __BIG_ENDIAN | |
d342894c | 233 | value >>= 16; |
321fb991 | 234 | #else |
235 | value <<= 16; | |
d342894c | 236 | #endif |
237 | return hash_64(value, FDB_HASH_BITS); | |
238 | } | |
239 | ||
240 | /* Hash chain to use given mac address */ | |
241 | static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan, | |
242 | const u8 *mac) | |
243 | { | |
244 | return &vxlan->fdb_head[eth_hash(mac)]; | |
245 | } | |
246 | ||
247 | /* Look up Ethernet address in forwarding table */ | |
248 | static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan, | |
249 | const u8 *mac) | |
250 | ||
251 | { | |
252 | struct hlist_head *head = vxlan_fdb_head(vxlan, mac); | |
253 | struct vxlan_fdb *f; | |
254 | struct hlist_node *node; | |
255 | ||
256 | hlist_for_each_entry_rcu(f, node, head, hlist) { | |
257 | if (compare_ether_addr(mac, f->eth_addr) == 0) | |
258 | return f; | |
259 | } | |
260 | ||
261 | return NULL; | |
262 | } | |
263 | ||
264 | /* Add new entry to forwarding table -- assumes lock held */ | |
265 | static int vxlan_fdb_create(struct vxlan_dev *vxlan, | |
266 | const u8 *mac, __be32 ip, | |
267 | __u16 state, __u16 flags) | |
268 | { | |
269 | struct vxlan_fdb *f; | |
270 | int notify = 0; | |
271 | ||
272 | f = vxlan_find_mac(vxlan, mac); | |
273 | if (f) { | |
274 | if (flags & NLM_F_EXCL) { | |
275 | netdev_dbg(vxlan->dev, | |
276 | "lost race to create %pM\n", mac); | |
277 | return -EEXIST; | |
278 | } | |
279 | if (f->state != state) { | |
280 | f->state = state; | |
281 | f->updated = jiffies; | |
282 | notify = 1; | |
283 | } | |
284 | } else { | |
285 | if (!(flags & NLM_F_CREATE)) | |
286 | return -ENOENT; | |
287 | ||
288 | if (vxlan->addrmax && vxlan->addrcnt >= vxlan->addrmax) | |
289 | return -ENOSPC; | |
290 | ||
291 | netdev_dbg(vxlan->dev, "add %pM -> %pI4\n", mac, &ip); | |
292 | f = kmalloc(sizeof(*f), GFP_ATOMIC); | |
293 | if (!f) | |
294 | return -ENOMEM; | |
295 | ||
296 | notify = 1; | |
297 | f->remote_ip = ip; | |
298 | f->state = state; | |
299 | f->updated = f->used = jiffies; | |
300 | memcpy(f->eth_addr, mac, ETH_ALEN); | |
301 | ||
302 | ++vxlan->addrcnt; | |
303 | hlist_add_head_rcu(&f->hlist, | |
304 | vxlan_fdb_head(vxlan, mac)); | |
305 | } | |
306 | ||
307 | if (notify) | |
308 | vxlan_fdb_notify(vxlan, f, RTM_NEWNEIGH); | |
309 | ||
310 | return 0; | |
311 | } | |
312 | ||
313 | static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f) | |
314 | { | |
315 | netdev_dbg(vxlan->dev, | |
316 | "delete %pM\n", f->eth_addr); | |
317 | ||
318 | --vxlan->addrcnt; | |
319 | vxlan_fdb_notify(vxlan, f, RTM_DELNEIGH); | |
320 | ||
321 | hlist_del_rcu(&f->hlist); | |
322 | kfree_rcu(f, rcu); | |
323 | } | |
324 | ||
325 | /* Add static entry (via netlink) */ | |
326 | static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], | |
327 | struct net_device *dev, | |
328 | const unsigned char *addr, u16 flags) | |
329 | { | |
330 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
331 | __be32 ip; | |
332 | int err; | |
333 | ||
334 | if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) { | |
335 | pr_info("RTM_NEWNEIGH with invalid state %#x\n", | |
336 | ndm->ndm_state); | |
337 | return -EINVAL; | |
338 | } | |
339 | ||
340 | if (tb[NDA_DST] == NULL) | |
341 | return -EINVAL; | |
342 | ||
343 | if (nla_len(tb[NDA_DST]) != sizeof(__be32)) | |
344 | return -EAFNOSUPPORT; | |
345 | ||
346 | ip = nla_get_be32(tb[NDA_DST]); | |
347 | ||
348 | spin_lock_bh(&vxlan->hash_lock); | |
349 | err = vxlan_fdb_create(vxlan, addr, ip, ndm->ndm_state, flags); | |
350 | spin_unlock_bh(&vxlan->hash_lock); | |
351 | ||
352 | return err; | |
353 | } | |
354 | ||
355 | /* Delete entry (via netlink) */ | |
356 | static int vxlan_fdb_delete(struct ndmsg *ndm, struct net_device *dev, | |
357 | const unsigned char *addr) | |
358 | { | |
359 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
360 | struct vxlan_fdb *f; | |
361 | int err = -ENOENT; | |
362 | ||
363 | spin_lock_bh(&vxlan->hash_lock); | |
364 | f = vxlan_find_mac(vxlan, addr); | |
365 | if (f) { | |
366 | vxlan_fdb_destroy(vxlan, f); | |
367 | err = 0; | |
368 | } | |
369 | spin_unlock_bh(&vxlan->hash_lock); | |
370 | ||
371 | return err; | |
372 | } | |
373 | ||
374 | /* Dump forwarding table */ | |
375 | static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb, | |
376 | struct net_device *dev, int idx) | |
377 | { | |
378 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
379 | unsigned int h; | |
380 | ||
381 | for (h = 0; h < FDB_HASH_SIZE; ++h) { | |
382 | struct vxlan_fdb *f; | |
383 | struct hlist_node *n; | |
384 | int err; | |
385 | ||
386 | hlist_for_each_entry_rcu(f, n, &vxlan->fdb_head[h], hlist) { | |
387 | if (idx < cb->args[0]) | |
388 | goto skip; | |
389 | ||
390 | err = vxlan_fdb_info(skb, vxlan, f, | |
391 | NETLINK_CB(cb->skb).portid, | |
392 | cb->nlh->nlmsg_seq, | |
393 | RTM_NEWNEIGH, | |
394 | NLM_F_MULTI); | |
395 | if (err < 0) | |
396 | break; | |
397 | skip: | |
398 | ++idx; | |
399 | } | |
400 | } | |
401 | ||
402 | return idx; | |
403 | } | |
404 | ||
405 | /* Watch incoming packets to learn mapping between Ethernet address | |
406 | * and Tunnel endpoint. | |
407 | */ | |
408 | static void vxlan_snoop(struct net_device *dev, | |
409 | __be32 src_ip, const u8 *src_mac) | |
410 | { | |
411 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
412 | struct vxlan_fdb *f; | |
413 | int err; | |
414 | ||
415 | f = vxlan_find_mac(vxlan, src_mac); | |
416 | if (likely(f)) { | |
417 | f->used = jiffies; | |
418 | if (likely(f->remote_ip == src_ip)) | |
419 | return; | |
420 | ||
421 | if (net_ratelimit()) | |
422 | netdev_info(dev, | |
423 | "%pM migrated from %pI4 to %pI4\n", | |
424 | src_mac, &f->remote_ip, &src_ip); | |
425 | ||
426 | f->remote_ip = src_ip; | |
427 | f->updated = jiffies; | |
428 | } else { | |
429 | /* learned new entry */ | |
430 | spin_lock(&vxlan->hash_lock); | |
431 | err = vxlan_fdb_create(vxlan, src_mac, src_ip, | |
432 | NUD_REACHABLE, | |
433 | NLM_F_EXCL|NLM_F_CREATE); | |
434 | spin_unlock(&vxlan->hash_lock); | |
435 | } | |
436 | } | |
437 | ||
438 | ||
439 | /* See if multicast group is already in use by other ID */ | |
440 | static bool vxlan_group_used(struct vxlan_net *vn, | |
441 | const struct vxlan_dev *this) | |
442 | { | |
443 | const struct vxlan_dev *vxlan; | |
444 | struct hlist_node *node; | |
445 | unsigned h; | |
446 | ||
447 | for (h = 0; h < VNI_HASH_SIZE; ++h) | |
448 | hlist_for_each_entry(vxlan, node, &vn->vni_list[h], hlist) { | |
449 | if (vxlan == this) | |
450 | continue; | |
451 | ||
452 | if (!netif_running(vxlan->dev)) | |
453 | continue; | |
454 | ||
455 | if (vxlan->gaddr == this->gaddr) | |
456 | return true; | |
457 | } | |
458 | ||
459 | return false; | |
460 | } | |
461 | ||
462 | /* kernel equivalent to IP_ADD_MEMBERSHIP */ | |
463 | static int vxlan_join_group(struct net_device *dev) | |
464 | { | |
465 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
466 | struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id); | |
467 | struct sock *sk = vn->sock->sk; | |
468 | struct ip_mreqn mreq = { | |
469 | .imr_multiaddr.s_addr = vxlan->gaddr, | |
470 | }; | |
471 | int err; | |
472 | ||
473 | /* Already a member of group */ | |
474 | if (vxlan_group_used(vn, vxlan)) | |
475 | return 0; | |
476 | ||
477 | /* Need to drop RTNL to call multicast join */ | |
478 | rtnl_unlock(); | |
479 | lock_sock(sk); | |
480 | err = ip_mc_join_group(sk, &mreq); | |
481 | release_sock(sk); | |
482 | rtnl_lock(); | |
483 | ||
484 | return err; | |
485 | } | |
486 | ||
487 | ||
488 | /* kernel equivalent to IP_DROP_MEMBERSHIP */ | |
489 | static int vxlan_leave_group(struct net_device *dev) | |
490 | { | |
491 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
492 | struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id); | |
493 | int err = 0; | |
494 | struct sock *sk = vn->sock->sk; | |
495 | struct ip_mreqn mreq = { | |
496 | .imr_multiaddr.s_addr = vxlan->gaddr, | |
497 | }; | |
498 | ||
499 | /* Only leave group when last vxlan is done. */ | |
500 | if (vxlan_group_used(vn, vxlan)) | |
501 | return 0; | |
502 | ||
503 | /* Need to drop RTNL to call multicast leave */ | |
504 | rtnl_unlock(); | |
505 | lock_sock(sk); | |
506 | err = ip_mc_leave_group(sk, &mreq); | |
507 | release_sock(sk); | |
508 | rtnl_lock(); | |
509 | ||
510 | return err; | |
511 | } | |
512 | ||
513 | /* Callback from net/ipv4/udp.c to receive packets */ | |
514 | static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb) | |
515 | { | |
516 | struct iphdr *oip; | |
517 | struct vxlanhdr *vxh; | |
518 | struct vxlan_dev *vxlan; | |
519 | struct vxlan_stats *stats; | |
520 | __u32 vni; | |
521 | int err; | |
522 | ||
523 | /* pop off outer UDP header */ | |
524 | __skb_pull(skb, sizeof(struct udphdr)); | |
525 | ||
526 | /* Need Vxlan and inner Ethernet header to be present */ | |
527 | if (!pskb_may_pull(skb, sizeof(struct vxlanhdr))) | |
528 | goto error; | |
529 | ||
530 | /* Drop packets with reserved bits set */ | |
531 | vxh = (struct vxlanhdr *) skb->data; | |
532 | if (vxh->vx_flags != htonl(VXLAN_FLAGS) || | |
533 | (vxh->vx_vni & htonl(0xff))) { | |
534 | netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n", | |
535 | ntohl(vxh->vx_flags), ntohl(vxh->vx_vni)); | |
536 | goto error; | |
537 | } | |
538 | ||
539 | __skb_pull(skb, sizeof(struct vxlanhdr)); | |
d342894c | 540 | |
541 | /* Is this VNI defined? */ | |
542 | vni = ntohl(vxh->vx_vni) >> 8; | |
543 | vxlan = vxlan_find_vni(sock_net(sk), vni); | |
544 | if (!vxlan) { | |
545 | netdev_dbg(skb->dev, "unknown vni %d\n", vni); | |
546 | goto drop; | |
547 | } | |
548 | ||
549 | if (!pskb_may_pull(skb, ETH_HLEN)) { | |
550 | vxlan->dev->stats.rx_length_errors++; | |
551 | vxlan->dev->stats.rx_errors++; | |
552 | goto drop; | |
553 | } | |
554 | ||
555 | /* Re-examine inner Ethernet packet */ | |
556 | oip = ip_hdr(skb); | |
557 | skb->protocol = eth_type_trans(skb, vxlan->dev); | |
d342894c | 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); | |
d97c00a3 | 569 | skb->ip_summed = CHECKSUM_NONE; |
d342894c | 570 | |
571 | err = IP_ECN_decapsulate(oip, skb); | |
572 | if (unlikely(err)) { | |
573 | if (log_ecn_error) | |
574 | net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", | |
575 | &oip->saddr, oip->tos); | |
576 | if (err > 1) { | |
577 | ++vxlan->dev->stats.rx_frame_errors; | |
578 | ++vxlan->dev->stats.rx_errors; | |
579 | goto drop; | |
580 | } | |
581 | } | |
582 | ||
583 | stats = this_cpu_ptr(vxlan->stats); | |
584 | u64_stats_update_begin(&stats->syncp); | |
585 | stats->rx_packets++; | |
586 | stats->rx_bytes += skb->len; | |
587 | u64_stats_update_end(&stats->syncp); | |
588 | ||
589 | netif_rx(skb); | |
590 | ||
591 | return 0; | |
592 | error: | |
593 | /* Put UDP header back */ | |
594 | __skb_push(skb, sizeof(struct udphdr)); | |
595 | ||
596 | return 1; | |
597 | drop: | |
598 | /* Consume bad packet */ | |
599 | kfree_skb(skb); | |
600 | return 0; | |
601 | } | |
602 | ||
603 | /* Extract dsfield from inner protocol */ | |
604 | static inline u8 vxlan_get_dsfield(const struct iphdr *iph, | |
605 | const struct sk_buff *skb) | |
606 | { | |
607 | if (skb->protocol == htons(ETH_P_IP)) | |
608 | return iph->tos; | |
609 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
610 | return ipv6_get_dsfield((const struct ipv6hdr *)iph); | |
611 | else | |
612 | return 0; | |
613 | } | |
614 | ||
615 | /* Propogate ECN bits out */ | |
616 | static inline u8 vxlan_ecn_encap(u8 tos, | |
617 | const struct iphdr *iph, | |
618 | const struct sk_buff *skb) | |
619 | { | |
620 | u8 inner = vxlan_get_dsfield(iph, skb); | |
621 | ||
622 | return INET_ECN_encapsulate(tos, inner); | |
623 | } | |
624 | ||
ef59febe | 625 | static __be32 vxlan_find_dst(struct vxlan_dev *vxlan, struct sk_buff *skb) |
626 | { | |
627 | const struct ethhdr *eth = (struct ethhdr *) skb->data; | |
628 | const struct vxlan_fdb *f; | |
629 | ||
630 | if (is_multicast_ether_addr(eth->h_dest)) | |
631 | return vxlan->gaddr; | |
632 | ||
633 | f = vxlan_find_mac(vxlan, eth->h_dest); | |
634 | if (f) | |
635 | return f->remote_ip; | |
636 | else | |
637 | return vxlan->gaddr; | |
638 | ||
639 | } | |
640 | ||
1cad8715 | 641 | static void vxlan_sock_free(struct sk_buff *skb) |
642 | { | |
643 | sock_put(skb->sk); | |
644 | } | |
645 | ||
646 | /* On transmit, associate with the tunnel socket */ | |
647 | static void vxlan_set_owner(struct net_device *dev, struct sk_buff *skb) | |
648 | { | |
649 | struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id); | |
650 | struct sock *sk = vn->sock->sk; | |
651 | ||
652 | skb_orphan(skb); | |
653 | sock_hold(sk); | |
654 | skb->sk = sk; | |
655 | skb->destructor = vxlan_sock_free; | |
656 | } | |
657 | ||
05f47d69 | 658 | /* Compute source port for outgoing packet |
659 | * first choice to use L4 flow hash since it will spread | |
660 | * better and maybe available from hardware | |
661 | * secondary choice is to use jhash on the Ethernet header | |
662 | */ | |
663 | static u16 vxlan_src_port(const struct vxlan_dev *vxlan, struct sk_buff *skb) | |
664 | { | |
665 | unsigned int range = (vxlan->port_max - vxlan->port_min) + 1; | |
666 | u32 hash; | |
667 | ||
668 | hash = skb_get_rxhash(skb); | |
669 | if (!hash) | |
670 | hash = jhash(skb->data, 2 * ETH_ALEN, | |
671 | (__force u32) skb->protocol); | |
672 | ||
673 | return (((u64) hash * range) >> 32) + vxlan->port_min; | |
674 | } | |
675 | ||
d342894c | 676 | /* Transmit local packets over Vxlan |
677 | * | |
678 | * Outer IP header inherits ECN and DF from inner header. | |
679 | * Outer UDP destination is the VXLAN assigned port. | |
05f47d69 | 680 | * source port is based on hash of flow |
d342894c | 681 | */ |
682 | static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev) | |
683 | { | |
684 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
685 | struct rtable *rt; | |
d342894c | 686 | const struct iphdr *old_iph; |
687 | struct iphdr *iph; | |
688 | struct vxlanhdr *vxh; | |
689 | struct udphdr *uh; | |
690 | struct flowi4 fl4; | |
d342894c | 691 | unsigned int pkt_len = skb->len; |
d342894c | 692 | __be32 dst; |
05f47d69 | 693 | __u16 src_port; |
d342894c | 694 | __be16 df = 0; |
695 | __u8 tos, ttl; | |
696 | int err; | |
697 | ||
ef59febe | 698 | dst = vxlan_find_dst(vxlan, skb); |
699 | if (!dst) | |
700 | goto drop; | |
701 | ||
d342894c | 702 | /* Need space for new headers (invalidates iph ptr) */ |
703 | if (skb_cow_head(skb, VXLAN_HEADROOM)) | |
704 | goto drop; | |
705 | ||
d342894c | 706 | old_iph = ip_hdr(skb); |
707 | ||
d342894c | 708 | ttl = vxlan->ttl; |
709 | if (!ttl && IN_MULTICAST(ntohl(dst))) | |
710 | ttl = 1; | |
711 | ||
712 | tos = vxlan->tos; | |
713 | if (tos == 1) | |
714 | tos = vxlan_get_dsfield(old_iph, skb); | |
715 | ||
05f47d69 | 716 | src_port = vxlan_src_port(vxlan, skb); |
d342894c | 717 | |
ca78f181 | 718 | memset(&fl4, 0, sizeof(fl4)); |
719 | fl4.flowi4_oif = vxlan->link; | |
720 | fl4.flowi4_tos = RT_TOS(tos); | |
721 | fl4.daddr = dst; | |
722 | fl4.saddr = vxlan->saddr; | |
723 | ||
724 | rt = ip_route_output_key(dev_net(dev), &fl4); | |
d342894c | 725 | if (IS_ERR(rt)) { |
726 | netdev_dbg(dev, "no route to %pI4\n", &dst); | |
727 | dev->stats.tx_carrier_errors++; | |
728 | goto tx_error; | |
729 | } | |
730 | ||
731 | if (rt->dst.dev == dev) { | |
732 | netdev_dbg(dev, "circular route to %pI4\n", &dst); | |
733 | ip_rt_put(rt); | |
734 | dev->stats.collisions++; | |
735 | goto tx_error; | |
736 | } | |
737 | ||
738 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); | |
739 | IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED | | |
740 | IPSKB_REROUTED); | |
741 | skb_dst_drop(skb); | |
742 | skb_dst_set(skb, &rt->dst); | |
743 | ||
744 | vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh)); | |
745 | vxh->vx_flags = htonl(VXLAN_FLAGS); | |
746 | vxh->vx_vni = htonl(vxlan->vni << 8); | |
747 | ||
748 | __skb_push(skb, sizeof(*uh)); | |
749 | skb_reset_transport_header(skb); | |
750 | uh = udp_hdr(skb); | |
751 | ||
752 | uh->dest = htons(vxlan_port); | |
05f47d69 | 753 | uh->source = htons(src_port); |
d342894c | 754 | |
755 | uh->len = htons(skb->len); | |
756 | uh->check = 0; | |
757 | ||
758 | __skb_push(skb, sizeof(*iph)); | |
759 | skb_reset_network_header(skb); | |
760 | iph = ip_hdr(skb); | |
761 | iph->version = 4; | |
762 | iph->ihl = sizeof(struct iphdr) >> 2; | |
763 | iph->frag_off = df; | |
764 | iph->protocol = IPPROTO_UDP; | |
765 | iph->tos = vxlan_ecn_encap(tos, old_iph, skb); | |
ca78f181 | 766 | iph->daddr = dst; |
d342894c | 767 | iph->saddr = fl4.saddr; |
768 | iph->ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); | |
769 | ||
1cad8715 | 770 | vxlan_set_owner(dev, skb); |
771 | ||
d342894c | 772 | /* See __IPTUNNEL_XMIT */ |
773 | skb->ip_summed = CHECKSUM_NONE; | |
774 | ip_select_ident(iph, &rt->dst, NULL); | |
775 | ||
776 | err = ip_local_out(skb); | |
777 | if (likely(net_xmit_eval(err) == 0)) { | |
778 | struct vxlan_stats *stats = this_cpu_ptr(vxlan->stats); | |
779 | ||
780 | u64_stats_update_begin(&stats->syncp); | |
781 | stats->tx_packets++; | |
782 | stats->tx_bytes += pkt_len; | |
783 | u64_stats_update_end(&stats->syncp); | |
784 | } else { | |
785 | dev->stats.tx_errors++; | |
786 | dev->stats.tx_aborted_errors++; | |
787 | } | |
788 | return NETDEV_TX_OK; | |
789 | ||
790 | drop: | |
791 | dev->stats.tx_dropped++; | |
792 | goto tx_free; | |
793 | ||
794 | tx_error: | |
795 | dev->stats.tx_errors++; | |
796 | tx_free: | |
797 | dev_kfree_skb(skb); | |
798 | return NETDEV_TX_OK; | |
799 | } | |
800 | ||
801 | /* Walk the forwarding table and purge stale entries */ | |
802 | static void vxlan_cleanup(unsigned long arg) | |
803 | { | |
804 | struct vxlan_dev *vxlan = (struct vxlan_dev *) arg; | |
805 | unsigned long next_timer = jiffies + FDB_AGE_INTERVAL; | |
806 | unsigned int h; | |
807 | ||
808 | if (!netif_running(vxlan->dev)) | |
809 | return; | |
810 | ||
811 | spin_lock_bh(&vxlan->hash_lock); | |
812 | for (h = 0; h < FDB_HASH_SIZE; ++h) { | |
813 | struct hlist_node *p, *n; | |
814 | hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) { | |
815 | struct vxlan_fdb *f | |
816 | = container_of(p, struct vxlan_fdb, hlist); | |
817 | unsigned long timeout; | |
818 | ||
3c172868 | 819 | if (f->state & NUD_PERMANENT) |
d342894c | 820 | continue; |
821 | ||
822 | timeout = f->used + vxlan->age_interval * HZ; | |
823 | if (time_before_eq(timeout, jiffies)) { | |
824 | netdev_dbg(vxlan->dev, | |
825 | "garbage collect %pM\n", | |
826 | f->eth_addr); | |
827 | f->state = NUD_STALE; | |
828 | vxlan_fdb_destroy(vxlan, f); | |
829 | } else if (time_before(timeout, next_timer)) | |
830 | next_timer = timeout; | |
831 | } | |
832 | } | |
833 | spin_unlock_bh(&vxlan->hash_lock); | |
834 | ||
835 | mod_timer(&vxlan->age_timer, next_timer); | |
836 | } | |
837 | ||
838 | /* Setup stats when device is created */ | |
839 | static int vxlan_init(struct net_device *dev) | |
840 | { | |
841 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
842 | ||
843 | vxlan->stats = alloc_percpu(struct vxlan_stats); | |
844 | if (!vxlan->stats) | |
845 | return -ENOMEM; | |
846 | ||
847 | return 0; | |
848 | } | |
849 | ||
850 | /* Start ageing timer and join group when device is brought up */ | |
851 | static int vxlan_open(struct net_device *dev) | |
852 | { | |
853 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
854 | int err; | |
855 | ||
856 | if (vxlan->gaddr) { | |
857 | err = vxlan_join_group(dev); | |
858 | if (err) | |
859 | return err; | |
860 | } | |
861 | ||
862 | if (vxlan->age_interval) | |
863 | mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL); | |
864 | ||
865 | return 0; | |
866 | } | |
867 | ||
868 | /* Purge the forwarding table */ | |
869 | static void vxlan_flush(struct vxlan_dev *vxlan) | |
870 | { | |
871 | unsigned h; | |
872 | ||
873 | spin_lock_bh(&vxlan->hash_lock); | |
874 | for (h = 0; h < FDB_HASH_SIZE; ++h) { | |
875 | struct hlist_node *p, *n; | |
876 | hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) { | |
877 | struct vxlan_fdb *f | |
878 | = container_of(p, struct vxlan_fdb, hlist); | |
879 | vxlan_fdb_destroy(vxlan, f); | |
880 | } | |
881 | } | |
882 | spin_unlock_bh(&vxlan->hash_lock); | |
883 | } | |
884 | ||
885 | /* Cleanup timer and forwarding table on shutdown */ | |
886 | static int vxlan_stop(struct net_device *dev) | |
887 | { | |
888 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
889 | ||
890 | if (vxlan->gaddr) | |
891 | vxlan_leave_group(dev); | |
892 | ||
893 | del_timer_sync(&vxlan->age_timer); | |
894 | ||
895 | vxlan_flush(vxlan); | |
896 | ||
897 | return 0; | |
898 | } | |
899 | ||
900 | /* Merge per-cpu statistics */ | |
901 | static struct rtnl_link_stats64 *vxlan_stats64(struct net_device *dev, | |
902 | struct rtnl_link_stats64 *stats) | |
903 | { | |
904 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
905 | struct vxlan_stats tmp, sum = { 0 }; | |
906 | unsigned int cpu; | |
907 | ||
908 | for_each_possible_cpu(cpu) { | |
909 | unsigned int start; | |
910 | const struct vxlan_stats *stats | |
911 | = per_cpu_ptr(vxlan->stats, cpu); | |
912 | ||
913 | do { | |
914 | start = u64_stats_fetch_begin_bh(&stats->syncp); | |
915 | memcpy(&tmp, stats, sizeof(tmp)); | |
916 | } while (u64_stats_fetch_retry_bh(&stats->syncp, start)); | |
917 | ||
918 | sum.tx_bytes += tmp.tx_bytes; | |
919 | sum.tx_packets += tmp.tx_packets; | |
920 | sum.rx_bytes += tmp.rx_bytes; | |
921 | sum.rx_packets += tmp.rx_packets; | |
922 | } | |
923 | ||
924 | stats->tx_bytes = sum.tx_bytes; | |
925 | stats->tx_packets = sum.tx_packets; | |
926 | stats->rx_bytes = sum.rx_bytes; | |
927 | stats->rx_packets = sum.rx_packets; | |
928 | ||
929 | stats->multicast = dev->stats.multicast; | |
930 | stats->rx_length_errors = dev->stats.rx_length_errors; | |
931 | stats->rx_frame_errors = dev->stats.rx_frame_errors; | |
932 | stats->rx_errors = dev->stats.rx_errors; | |
933 | ||
934 | stats->tx_dropped = dev->stats.tx_dropped; | |
935 | stats->tx_carrier_errors = dev->stats.tx_carrier_errors; | |
936 | stats->tx_aborted_errors = dev->stats.tx_aborted_errors; | |
937 | stats->collisions = dev->stats.collisions; | |
938 | stats->tx_errors = dev->stats.tx_errors; | |
939 | ||
940 | return stats; | |
941 | } | |
942 | ||
943 | /* Stub, nothing needs to be done. */ | |
944 | static void vxlan_set_multicast_list(struct net_device *dev) | |
945 | { | |
946 | } | |
947 | ||
948 | static const struct net_device_ops vxlan_netdev_ops = { | |
949 | .ndo_init = vxlan_init, | |
950 | .ndo_open = vxlan_open, | |
951 | .ndo_stop = vxlan_stop, | |
952 | .ndo_start_xmit = vxlan_xmit, | |
953 | .ndo_get_stats64 = vxlan_stats64, | |
954 | .ndo_set_rx_mode = vxlan_set_multicast_list, | |
955 | .ndo_change_mtu = eth_change_mtu, | |
956 | .ndo_validate_addr = eth_validate_addr, | |
957 | .ndo_set_mac_address = eth_mac_addr, | |
958 | .ndo_fdb_add = vxlan_fdb_add, | |
959 | .ndo_fdb_del = vxlan_fdb_delete, | |
960 | .ndo_fdb_dump = vxlan_fdb_dump, | |
961 | }; | |
962 | ||
963 | /* Info for udev, that this is a virtual tunnel endpoint */ | |
964 | static struct device_type vxlan_type = { | |
965 | .name = "vxlan", | |
966 | }; | |
967 | ||
968 | static void vxlan_free(struct net_device *dev) | |
969 | { | |
970 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
971 | ||
972 | free_percpu(vxlan->stats); | |
973 | free_netdev(dev); | |
974 | } | |
975 | ||
976 | /* Initialize the device structure. */ | |
977 | static void vxlan_setup(struct net_device *dev) | |
978 | { | |
979 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
980 | unsigned h; | |
05f47d69 | 981 | int low, high; |
d342894c | 982 | |
983 | eth_hw_addr_random(dev); | |
984 | ether_setup(dev); | |
2840bf22 | 985 | dev->hard_header_len = ETH_HLEN + VXLAN_HEADROOM; |
d342894c | 986 | |
987 | dev->netdev_ops = &vxlan_netdev_ops; | |
988 | dev->destructor = vxlan_free; | |
989 | SET_NETDEV_DEVTYPE(dev, &vxlan_type); | |
990 | ||
991 | dev->tx_queue_len = 0; | |
992 | dev->features |= NETIF_F_LLTX; | |
993 | dev->features |= NETIF_F_NETNS_LOCAL; | |
994 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; | |
995 | ||
996 | spin_lock_init(&vxlan->hash_lock); | |
997 | ||
998 | init_timer_deferrable(&vxlan->age_timer); | |
999 | vxlan->age_timer.function = vxlan_cleanup; | |
1000 | vxlan->age_timer.data = (unsigned long) vxlan; | |
1001 | ||
05f47d69 | 1002 | inet_get_local_port_range(&low, &high); |
1003 | vxlan->port_min = low; | |
1004 | vxlan->port_max = high; | |
1005 | ||
d342894c | 1006 | vxlan->dev = dev; |
1007 | ||
1008 | for (h = 0; h < FDB_HASH_SIZE; ++h) | |
1009 | INIT_HLIST_HEAD(&vxlan->fdb_head[h]); | |
1010 | } | |
1011 | ||
1012 | static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = { | |
1013 | [IFLA_VXLAN_ID] = { .type = NLA_U32 }, | |
1014 | [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) }, | |
1015 | [IFLA_VXLAN_LINK] = { .type = NLA_U32 }, | |
1016 | [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) }, | |
1017 | [IFLA_VXLAN_TOS] = { .type = NLA_U8 }, | |
1018 | [IFLA_VXLAN_TTL] = { .type = NLA_U8 }, | |
1019 | [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 }, | |
1020 | [IFLA_VXLAN_AGEING] = { .type = NLA_U32 }, | |
1021 | [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 }, | |
05f47d69 | 1022 | [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) }, |
d342894c | 1023 | }; |
1024 | ||
1025 | static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[]) | |
1026 | { | |
1027 | if (tb[IFLA_ADDRESS]) { | |
1028 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { | |
1029 | pr_debug("invalid link address (not ethernet)\n"); | |
1030 | return -EINVAL; | |
1031 | } | |
1032 | ||
1033 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { | |
1034 | pr_debug("invalid all zero ethernet address\n"); | |
1035 | return -EADDRNOTAVAIL; | |
1036 | } | |
1037 | } | |
1038 | ||
1039 | if (!data) | |
1040 | return -EINVAL; | |
1041 | ||
1042 | if (data[IFLA_VXLAN_ID]) { | |
1043 | __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]); | |
1044 | if (id >= VXLAN_VID_MASK) | |
1045 | return -ERANGE; | |
1046 | } | |
1047 | ||
1048 | if (data[IFLA_VXLAN_GROUP]) { | |
1049 | __be32 gaddr = nla_get_be32(data[IFLA_VXLAN_GROUP]); | |
1050 | if (!IN_MULTICAST(ntohl(gaddr))) { | |
1051 | pr_debug("group address is not IPv4 multicast\n"); | |
1052 | return -EADDRNOTAVAIL; | |
1053 | } | |
1054 | } | |
05f47d69 | 1055 | |
1056 | if (data[IFLA_VXLAN_PORT_RANGE]) { | |
1057 | const struct ifla_vxlan_port_range *p | |
1058 | = nla_data(data[IFLA_VXLAN_PORT_RANGE]); | |
1059 | ||
1060 | if (ntohs(p->high) < ntohs(p->low)) { | |
1061 | pr_debug("port range %u .. %u not valid\n", | |
1062 | ntohs(p->low), ntohs(p->high)); | |
1063 | return -EINVAL; | |
1064 | } | |
1065 | } | |
1066 | ||
d342894c | 1067 | return 0; |
1068 | } | |
1069 | ||
1070 | static int vxlan_newlink(struct net *net, struct net_device *dev, | |
1071 | struct nlattr *tb[], struct nlattr *data[]) | |
1072 | { | |
1073 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1074 | __u32 vni; | |
1075 | int err; | |
1076 | ||
1077 | if (!data[IFLA_VXLAN_ID]) | |
1078 | return -EINVAL; | |
1079 | ||
1080 | vni = nla_get_u32(data[IFLA_VXLAN_ID]); | |
1081 | if (vxlan_find_vni(net, vni)) { | |
1082 | pr_info("duplicate VNI %u\n", vni); | |
1083 | return -EEXIST; | |
1084 | } | |
1085 | vxlan->vni = vni; | |
1086 | ||
1087 | if (data[IFLA_VXLAN_GROUP]) | |
1088 | vxlan->gaddr = nla_get_be32(data[IFLA_VXLAN_GROUP]); | |
1089 | ||
1090 | if (data[IFLA_VXLAN_LOCAL]) | |
1091 | vxlan->saddr = nla_get_be32(data[IFLA_VXLAN_LOCAL]); | |
1092 | ||
34e02aa1 | 1093 | if (data[IFLA_VXLAN_LINK] && |
1094 | (vxlan->link = nla_get_u32(data[IFLA_VXLAN_LINK]))) { | |
1095 | struct net_device *lowerdev | |
1096 | = __dev_get_by_index(net, vxlan->link); | |
1097 | ||
1098 | if (!lowerdev) { | |
1099 | pr_info("ifindex %d does not exist\n", vxlan->link); | |
1100 | return -ENODEV; | |
1101 | } | |
d342894c | 1102 | |
34e02aa1 | 1103 | if (!tb[IFLA_MTU]) |
d342894c | 1104 | dev->mtu = lowerdev->mtu - VXLAN_HEADROOM; |
d342894c | 1105 | } |
1106 | ||
1107 | if (data[IFLA_VXLAN_TOS]) | |
1108 | vxlan->tos = nla_get_u8(data[IFLA_VXLAN_TOS]); | |
1109 | ||
1110 | if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING])) | |
1111 | vxlan->learn = true; | |
1112 | ||
1113 | if (data[IFLA_VXLAN_AGEING]) | |
1114 | vxlan->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]); | |
1115 | else | |
1116 | vxlan->age_interval = FDB_AGE_DEFAULT; | |
1117 | ||
1118 | if (data[IFLA_VXLAN_LIMIT]) | |
1119 | vxlan->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]); | |
1120 | ||
05f47d69 | 1121 | if (data[IFLA_VXLAN_PORT_RANGE]) { |
1122 | const struct ifla_vxlan_port_range *p | |
1123 | = nla_data(data[IFLA_VXLAN_PORT_RANGE]); | |
1124 | vxlan->port_min = ntohs(p->low); | |
1125 | vxlan->port_max = ntohs(p->high); | |
1126 | } | |
1127 | ||
d342894c | 1128 | err = register_netdevice(dev); |
1129 | if (!err) | |
1130 | hlist_add_head_rcu(&vxlan->hlist, vni_head(net, vxlan->vni)); | |
1131 | ||
1132 | return err; | |
1133 | } | |
1134 | ||
1135 | static void vxlan_dellink(struct net_device *dev, struct list_head *head) | |
1136 | { | |
1137 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1138 | ||
1139 | hlist_del_rcu(&vxlan->hlist); | |
1140 | ||
1141 | unregister_netdevice_queue(dev, head); | |
1142 | } | |
1143 | ||
1144 | static size_t vxlan_get_size(const struct net_device *dev) | |
1145 | { | |
1146 | ||
1147 | return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */ | |
1148 | nla_total_size(sizeof(__be32)) +/* IFLA_VXLAN_GROUP */ | |
1149 | nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */ | |
1150 | nla_total_size(sizeof(__be32))+ /* IFLA_VXLAN_LOCAL */ | |
1151 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */ | |
1152 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */ | |
1153 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */ | |
1154 | nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */ | |
1155 | nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */ | |
05f47d69 | 1156 | nla_total_size(sizeof(struct ifla_vxlan_port_range)) + |
d342894c | 1157 | 0; |
1158 | } | |
1159 | ||
1160 | static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
1161 | { | |
1162 | const struct vxlan_dev *vxlan = netdev_priv(dev); | |
05f47d69 | 1163 | struct ifla_vxlan_port_range ports = { |
1164 | .low = htons(vxlan->port_min), | |
1165 | .high = htons(vxlan->port_max), | |
1166 | }; | |
d342894c | 1167 | |
1168 | if (nla_put_u32(skb, IFLA_VXLAN_ID, vxlan->vni)) | |
1169 | goto nla_put_failure; | |
1170 | ||
7c41c42c | 1171 | if (vxlan->gaddr && nla_put_be32(skb, IFLA_VXLAN_GROUP, vxlan->gaddr)) |
d342894c | 1172 | goto nla_put_failure; |
1173 | ||
1174 | if (vxlan->link && nla_put_u32(skb, IFLA_VXLAN_LINK, vxlan->link)) | |
1175 | goto nla_put_failure; | |
1176 | ||
7c41c42c | 1177 | if (vxlan->saddr && nla_put_be32(skb, IFLA_VXLAN_LOCAL, vxlan->saddr)) |
d342894c | 1178 | goto nla_put_failure; |
1179 | ||
1180 | if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->ttl) || | |
1181 | nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->tos) || | |
1182 | nla_put_u8(skb, IFLA_VXLAN_LEARNING, vxlan->learn) || | |
1183 | nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->age_interval) || | |
1184 | nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->addrmax)) | |
1185 | goto nla_put_failure; | |
1186 | ||
05f47d69 | 1187 | if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports)) |
1188 | goto nla_put_failure; | |
1189 | ||
d342894c | 1190 | return 0; |
1191 | ||
1192 | nla_put_failure: | |
1193 | return -EMSGSIZE; | |
1194 | } | |
1195 | ||
1196 | static struct rtnl_link_ops vxlan_link_ops __read_mostly = { | |
1197 | .kind = "vxlan", | |
1198 | .maxtype = IFLA_VXLAN_MAX, | |
1199 | .policy = vxlan_policy, | |
1200 | .priv_size = sizeof(struct vxlan_dev), | |
1201 | .setup = vxlan_setup, | |
1202 | .validate = vxlan_validate, | |
1203 | .newlink = vxlan_newlink, | |
1204 | .dellink = vxlan_dellink, | |
1205 | .get_size = vxlan_get_size, | |
1206 | .fill_info = vxlan_fill_info, | |
1207 | }; | |
1208 | ||
1209 | static __net_init int vxlan_init_net(struct net *net) | |
1210 | { | |
1211 | struct vxlan_net *vn = net_generic(net, vxlan_net_id); | |
1212 | struct sock *sk; | |
1213 | struct sockaddr_in vxlan_addr = { | |
1214 | .sin_family = AF_INET, | |
1215 | .sin_addr.s_addr = htonl(INADDR_ANY), | |
1216 | }; | |
1217 | int rc; | |
1218 | unsigned h; | |
1219 | ||
1220 | /* Create UDP socket for encapsulation receive. */ | |
1221 | rc = sock_create_kern(AF_INET, SOCK_DGRAM, IPPROTO_UDP, &vn->sock); | |
1222 | if (rc < 0) { | |
1223 | pr_debug("UDP socket create failed\n"); | |
1224 | return rc; | |
1225 | } | |
bfe1b9b1 | 1226 | /* Put in proper namespace */ |
1227 | sk = vn->sock->sk; | |
1228 | sk_change_net(sk, net); | |
d342894c | 1229 | |
1230 | vxlan_addr.sin_port = htons(vxlan_port); | |
1231 | ||
1232 | rc = kernel_bind(vn->sock, (struct sockaddr *) &vxlan_addr, | |
1233 | sizeof(vxlan_addr)); | |
1234 | if (rc < 0) { | |
1235 | pr_debug("bind for UDP socket %pI4:%u (%d)\n", | |
1236 | &vxlan_addr.sin_addr, ntohs(vxlan_addr.sin_port), rc); | |
bfe1b9b1 | 1237 | sk_release_kernel(sk); |
d342894c | 1238 | vn->sock = NULL; |
1239 | return rc; | |
1240 | } | |
1241 | ||
1242 | /* Disable multicast loopback */ | |
d342894c | 1243 | inet_sk(sk)->mc_loop = 0; |
1244 | ||
1245 | /* Mark socket as an encapsulation socket. */ | |
1246 | udp_sk(sk)->encap_type = 1; | |
1247 | udp_sk(sk)->encap_rcv = vxlan_udp_encap_recv; | |
1248 | udp_encap_enable(); | |
1249 | ||
1250 | for (h = 0; h < VNI_HASH_SIZE; ++h) | |
1251 | INIT_HLIST_HEAD(&vn->vni_list[h]); | |
1252 | ||
1253 | return 0; | |
1254 | } | |
1255 | ||
1256 | static __net_exit void vxlan_exit_net(struct net *net) | |
1257 | { | |
1258 | struct vxlan_net *vn = net_generic(net, vxlan_net_id); | |
1259 | ||
1260 | if (vn->sock) { | |
bfe1b9b1 | 1261 | sk_release_kernel(vn->sock->sk); |
d342894c | 1262 | vn->sock = NULL; |
1263 | } | |
1264 | } | |
1265 | ||
1266 | static struct pernet_operations vxlan_net_ops = { | |
1267 | .init = vxlan_init_net, | |
1268 | .exit = vxlan_exit_net, | |
1269 | .id = &vxlan_net_id, | |
1270 | .size = sizeof(struct vxlan_net), | |
1271 | }; | |
1272 | ||
1273 | static int __init vxlan_init_module(void) | |
1274 | { | |
1275 | int rc; | |
1276 | ||
1277 | get_random_bytes(&vxlan_salt, sizeof(vxlan_salt)); | |
1278 | ||
1279 | rc = register_pernet_device(&vxlan_net_ops); | |
1280 | if (rc) | |
1281 | goto out1; | |
1282 | ||
1283 | rc = rtnl_link_register(&vxlan_link_ops); | |
1284 | if (rc) | |
1285 | goto out2; | |
1286 | ||
1287 | return 0; | |
1288 | ||
1289 | out2: | |
1290 | unregister_pernet_device(&vxlan_net_ops); | |
1291 | out1: | |
1292 | return rc; | |
1293 | } | |
1294 | module_init(vxlan_init_module); | |
1295 | ||
1296 | static void __exit vxlan_cleanup_module(void) | |
1297 | { | |
1298 | rtnl_link_unregister(&vxlan_link_ops); | |
1299 | unregister_pernet_device(&vxlan_net_ops); | |
1300 | } | |
1301 | module_exit(vxlan_cleanup_module); | |
1302 | ||
1303 | MODULE_LICENSE("GPL"); | |
1304 | MODULE_VERSION(VXLAN_VERSION); | |
1305 | MODULE_AUTHOR("Stephen Hemminger <shemminger@vyatta.com>"); | |
1306 | MODULE_ALIAS_RTNL_LINK("vxlan"); |