]>
Commit | Line | Data |
---|---|---|
d342894c | 1 | /* |
eb5ce439 | 2 | * VXLAN: Virtual eXtensible Local Area Network |
d342894c | 3 | * |
3b8df3c6 | 4 | * Copyright (c) 2012-2013 Vyatta Inc. |
d342894c | 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 | |
d342894c | 11 | * - IPv6 (not in RFC) |
12 | */ | |
13 | ||
14 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
15 | ||
16 | #include <linux/kernel.h> | |
17 | #include <linux/types.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/errno.h> | |
20 | #include <linux/slab.h> | |
21 | #include <linux/skbuff.h> | |
22 | #include <linux/rculist.h> | |
23 | #include <linux/netdevice.h> | |
24 | #include <linux/in.h> | |
25 | #include <linux/ip.h> | |
26 | #include <linux/udp.h> | |
27 | #include <linux/igmp.h> | |
28 | #include <linux/etherdevice.h> | |
29 | #include <linux/if_ether.h> | |
d342894c | 30 | #include <linux/hash.h> |
1b13c97f | 31 | #include <linux/ethtool.h> |
e4f67add DS |
32 | #include <net/arp.h> |
33 | #include <net/ndisc.h> | |
d342894c | 34 | #include <net/ip.h> |
c5441932 | 35 | #include <net/ip_tunnels.h> |
d342894c | 36 | #include <net/icmp.h> |
37 | #include <net/udp.h> | |
38 | #include <net/rtnetlink.h> | |
39 | #include <net/route.h> | |
40 | #include <net/dsfield.h> | |
41 | #include <net/inet_ecn.h> | |
42 | #include <net/net_namespace.h> | |
43 | #include <net/netns/generic.h> | |
44 | ||
45 | #define VXLAN_VERSION "0.1" | |
46 | ||
553675fb | 47 | #define PORT_HASH_BITS 8 |
48 | #define PORT_HASH_SIZE (1<<PORT_HASH_BITS) | |
d342894c | 49 | #define VNI_HASH_BITS 10 |
50 | #define VNI_HASH_SIZE (1<<VNI_HASH_BITS) | |
51 | #define FDB_HASH_BITS 8 | |
52 | #define FDB_HASH_SIZE (1<<FDB_HASH_BITS) | |
53 | #define FDB_AGE_DEFAULT 300 /* 5 min */ | |
54 | #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */ | |
55 | ||
56 | #define VXLAN_N_VID (1u << 24) | |
57 | #define VXLAN_VID_MASK (VXLAN_N_VID - 1) | |
52b702ff AD |
58 | /* IP header + UDP + VXLAN + Ethernet header */ |
59 | #define VXLAN_HEADROOM (20 + 8 + 8 + 14) | |
d342894c | 60 | |
61 | #define VXLAN_FLAGS 0x08000000 /* struct vxlanhdr.vx_flags required value. */ | |
62 | ||
63 | /* VXLAN protocol header */ | |
64 | struct vxlanhdr { | |
65 | __be32 vx_flags; | |
66 | __be32 vx_vni; | |
67 | }; | |
68 | ||
23c578bf | 69 | /* UDP port for VXLAN traffic. |
70 | * The IANA assigned port is 4789, but the Linux default is 8472 | |
234f5b73 | 71 | * for compatibility with early adopters. |
23c578bf | 72 | */ |
9daaa397 SH |
73 | static unsigned short vxlan_port __read_mostly = 8472; |
74 | module_param_named(udp_port, vxlan_port, ushort, 0444); | |
d342894c | 75 | MODULE_PARM_DESC(udp_port, "Destination UDP port"); |
76 | ||
77 | static bool log_ecn_error = true; | |
78 | module_param(log_ecn_error, bool, 0644); | |
79 | MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); | |
80 | ||
60d9d4c6 | 81 | static int vxlan_net_id; |
553675fb | 82 | |
afbd8bae MR |
83 | static const u8 all_zeros_mac[ETH_ALEN]; |
84 | ||
553675fb | 85 | /* per UDP socket information */ |
86 | struct vxlan_sock { | |
87 | struct hlist_node hlist; | |
88 | struct rcu_head rcu; | |
89 | struct work_struct del_work; | |
7c47cedf | 90 | atomic_t refcnt; |
553675fb | 91 | struct socket *sock; |
d342894c | 92 | struct hlist_head vni_list[VNI_HASH_SIZE]; |
93 | }; | |
94 | ||
553675fb | 95 | /* per-network namespace private data for this module */ |
96 | struct vxlan_net { | |
97 | struct list_head vxlan_list; | |
98 | struct hlist_head sock_list[PORT_HASH_SIZE]; | |
1c51a915 | 99 | spinlock_t sock_lock; |
553675fb | 100 | }; |
101 | ||
6681712d | 102 | struct vxlan_rdst { |
6681712d DS |
103 | __be32 remote_ip; |
104 | __be16 remote_port; | |
105 | u32 remote_vni; | |
106 | u32 remote_ifindex; | |
3e61aa8f | 107 | struct list_head list; |
6681712d DS |
108 | }; |
109 | ||
d342894c | 110 | /* Forwarding table entry */ |
111 | struct vxlan_fdb { | |
112 | struct hlist_node hlist; /* linked list of entries */ | |
113 | struct rcu_head rcu; | |
114 | unsigned long updated; /* jiffies */ | |
115 | unsigned long used; | |
3e61aa8f | 116 | struct list_head remotes; |
d342894c | 117 | u16 state; /* see ndm_state */ |
ae884082 | 118 | u8 flags; /* see ndm_flags */ |
d342894c | 119 | u8 eth_addr[ETH_ALEN]; |
120 | }; | |
121 | ||
d342894c | 122 | /* Pseudo network device */ |
123 | struct vxlan_dev { | |
553675fb | 124 | struct hlist_node hlist; /* vni hash table */ |
125 | struct list_head next; /* vxlan's per namespace list */ | |
126 | struct vxlan_sock *vn_sock; /* listening socket */ | |
d342894c | 127 | struct net_device *dev; |
c7995c43 | 128 | struct vxlan_rdst default_dst; /* default destination */ |
d342894c | 129 | __be32 saddr; /* source address */ |
823aa873 | 130 | __be16 dst_port; |
05f47d69 | 131 | __u16 port_min; /* source port range */ |
132 | __u16 port_max; | |
d342894c | 133 | __u8 tos; /* TOS override */ |
134 | __u8 ttl; | |
e4f67add | 135 | u32 flags; /* VXLAN_F_* below */ |
d342894c | 136 | |
1c51a915 | 137 | struct work_struct sock_work; |
7c47cedf | 138 | struct work_struct igmp_work; |
1c51a915 | 139 | |
d342894c | 140 | unsigned long age_interval; |
141 | struct timer_list age_timer; | |
142 | spinlock_t hash_lock; | |
143 | unsigned int addrcnt; | |
144 | unsigned int addrmax; | |
d342894c | 145 | |
146 | struct hlist_head fdb_head[FDB_HASH_SIZE]; | |
147 | }; | |
148 | ||
e4f67add DS |
149 | #define VXLAN_F_LEARN 0x01 |
150 | #define VXLAN_F_PROXY 0x02 | |
151 | #define VXLAN_F_RSC 0x04 | |
152 | #define VXLAN_F_L2MISS 0x08 | |
153 | #define VXLAN_F_L3MISS 0x10 | |
154 | ||
d342894c | 155 | /* salt for hash table */ |
156 | static u32 vxlan_salt __read_mostly; | |
758c57d1 | 157 | static struct workqueue_struct *vxlan_wq; |
d342894c | 158 | |
1c51a915 SH |
159 | static void vxlan_sock_work(struct work_struct *work); |
160 | ||
553675fb | 161 | /* Virtual Network hash table head */ |
162 | static inline struct hlist_head *vni_head(struct vxlan_sock *vs, u32 id) | |
163 | { | |
164 | return &vs->vni_list[hash_32(id, VNI_HASH_BITS)]; | |
165 | } | |
166 | ||
167 | /* Socket hash table head */ | |
168 | static inline struct hlist_head *vs_head(struct net *net, __be16 port) | |
d342894c | 169 | { |
170 | struct vxlan_net *vn = net_generic(net, vxlan_net_id); | |
171 | ||
553675fb | 172 | return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)]; |
173 | } | |
174 | ||
3e61aa8f SH |
175 | /* First remote destination for a forwarding entry. |
176 | * Guaranteed to be non-NULL because remotes are never deleted. | |
177 | */ | |
178 | static inline struct vxlan_rdst *first_remote(struct vxlan_fdb *fdb) | |
179 | { | |
180 | return list_first_or_null_rcu(&fdb->remotes, struct vxlan_rdst, list); | |
181 | } | |
182 | ||
553675fb | 183 | /* Find VXLAN socket based on network namespace and UDP port */ |
184 | static struct vxlan_sock *vxlan_find_port(struct net *net, __be16 port) | |
185 | { | |
186 | struct vxlan_sock *vs; | |
187 | ||
188 | hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) { | |
189 | if (inet_sk(vs->sock->sk)->inet_sport == port) | |
190 | return vs; | |
191 | } | |
192 | return NULL; | |
d342894c | 193 | } |
194 | ||
195 | /* Look up VNI in a per net namespace table */ | |
553675fb | 196 | static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id, __be16 port) |
d342894c | 197 | { |
553675fb | 198 | struct vxlan_sock *vs; |
d342894c | 199 | struct vxlan_dev *vxlan; |
d342894c | 200 | |
553675fb | 201 | vs = vxlan_find_port(net, port); |
202 | if (!vs) | |
203 | return NULL; | |
204 | ||
205 | hlist_for_each_entry_rcu(vxlan, vni_head(vs, id), hlist) { | |
c7995c43 | 206 | if (vxlan->default_dst.remote_vni == id) |
d342894c | 207 | return vxlan; |
208 | } | |
209 | ||
210 | return NULL; | |
211 | } | |
212 | ||
213 | /* Fill in neighbour message in skbuff. */ | |
214 | static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan, | |
234f5b73 SH |
215 | const struct vxlan_fdb *fdb, |
216 | u32 portid, u32 seq, int type, unsigned int flags, | |
217 | const struct vxlan_rdst *rdst) | |
d342894c | 218 | { |
219 | unsigned long now = jiffies; | |
220 | struct nda_cacheinfo ci; | |
221 | struct nlmsghdr *nlh; | |
222 | struct ndmsg *ndm; | |
e4f67add | 223 | bool send_ip, send_eth; |
d342894c | 224 | |
225 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags); | |
226 | if (nlh == NULL) | |
227 | return -EMSGSIZE; | |
228 | ||
229 | ndm = nlmsg_data(nlh); | |
230 | memset(ndm, 0, sizeof(*ndm)); | |
e4f67add DS |
231 | |
232 | send_eth = send_ip = true; | |
233 | ||
234 | if (type == RTM_GETNEIGH) { | |
235 | ndm->ndm_family = AF_INET; | |
6681712d | 236 | send_ip = rdst->remote_ip != htonl(INADDR_ANY); |
e4f67add DS |
237 | send_eth = !is_zero_ether_addr(fdb->eth_addr); |
238 | } else | |
239 | ndm->ndm_family = AF_BRIDGE; | |
d342894c | 240 | ndm->ndm_state = fdb->state; |
241 | ndm->ndm_ifindex = vxlan->dev->ifindex; | |
ae884082 | 242 | ndm->ndm_flags = fdb->flags; |
d342894c | 243 | ndm->ndm_type = NDA_DST; |
244 | ||
e4f67add | 245 | if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr)) |
d342894c | 246 | goto nla_put_failure; |
247 | ||
6681712d DS |
248 | if (send_ip && nla_put_be32(skb, NDA_DST, rdst->remote_ip)) |
249 | goto nla_put_failure; | |
250 | ||
823aa873 | 251 | if (rdst->remote_port && rdst->remote_port != vxlan->dst_port && |
6681712d DS |
252 | nla_put_be16(skb, NDA_PORT, rdst->remote_port)) |
253 | goto nla_put_failure; | |
c7995c43 | 254 | if (rdst->remote_vni != vxlan->default_dst.remote_vni && |
60d9d4c6 | 255 | nla_put_u32(skb, NDA_VNI, rdst->remote_vni)) |
6681712d DS |
256 | goto nla_put_failure; |
257 | if (rdst->remote_ifindex && | |
258 | nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex)) | |
d342894c | 259 | goto nla_put_failure; |
260 | ||
261 | ci.ndm_used = jiffies_to_clock_t(now - fdb->used); | |
262 | ci.ndm_confirmed = 0; | |
263 | ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated); | |
264 | ci.ndm_refcnt = 0; | |
265 | ||
266 | if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci)) | |
267 | goto nla_put_failure; | |
268 | ||
269 | return nlmsg_end(skb, nlh); | |
270 | ||
271 | nla_put_failure: | |
272 | nlmsg_cancel(skb, nlh); | |
273 | return -EMSGSIZE; | |
274 | } | |
275 | ||
276 | static inline size_t vxlan_nlmsg_size(void) | |
277 | { | |
278 | return NLMSG_ALIGN(sizeof(struct ndmsg)) | |
279 | + nla_total_size(ETH_ALEN) /* NDA_LLADDR */ | |
280 | + nla_total_size(sizeof(__be32)) /* NDA_DST */ | |
73cf3317 | 281 | + nla_total_size(sizeof(__be16)) /* NDA_PORT */ |
6681712d DS |
282 | + nla_total_size(sizeof(__be32)) /* NDA_VNI */ |
283 | + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */ | |
d342894c | 284 | + nla_total_size(sizeof(struct nda_cacheinfo)); |
285 | } | |
286 | ||
287 | static void vxlan_fdb_notify(struct vxlan_dev *vxlan, | |
3e61aa8f | 288 | struct vxlan_fdb *fdb, int type) |
d342894c | 289 | { |
290 | struct net *net = dev_net(vxlan->dev); | |
291 | struct sk_buff *skb; | |
292 | int err = -ENOBUFS; | |
293 | ||
294 | skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC); | |
295 | if (skb == NULL) | |
296 | goto errout; | |
297 | ||
3e61aa8f | 298 | err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, first_remote(fdb)); |
d342894c | 299 | if (err < 0) { |
300 | /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */ | |
301 | WARN_ON(err == -EMSGSIZE); | |
302 | kfree_skb(skb); | |
303 | goto errout; | |
304 | } | |
305 | ||
306 | rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); | |
307 | return; | |
308 | errout: | |
309 | if (err < 0) | |
310 | rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); | |
311 | } | |
312 | ||
e4f67add DS |
313 | static void vxlan_ip_miss(struct net_device *dev, __be32 ipa) |
314 | { | |
315 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
bb3fd687 SH |
316 | struct vxlan_fdb f = { |
317 | .state = NUD_STALE, | |
318 | }; | |
319 | struct vxlan_rdst remote = { | |
320 | .remote_ip = ipa, /* goes to NDA_DST */ | |
321 | .remote_vni = VXLAN_N_VID, | |
322 | }; | |
3e61aa8f SH |
323 | |
324 | INIT_LIST_HEAD(&f.remotes); | |
325 | list_add_rcu(&remote.list, &f.remotes); | |
e4f67add DS |
326 | |
327 | vxlan_fdb_notify(vxlan, &f, RTM_GETNEIGH); | |
328 | } | |
329 | ||
330 | static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN]) | |
331 | { | |
bb3fd687 SH |
332 | struct vxlan_fdb f = { |
333 | .state = NUD_STALE, | |
334 | }; | |
e4f67add | 335 | |
3e61aa8f | 336 | INIT_LIST_HEAD(&f.remotes); |
e4f67add DS |
337 | memcpy(f.eth_addr, eth_addr, ETH_ALEN); |
338 | ||
339 | vxlan_fdb_notify(vxlan, &f, RTM_GETNEIGH); | |
340 | } | |
341 | ||
d342894c | 342 | /* Hash Ethernet address */ |
343 | static u32 eth_hash(const unsigned char *addr) | |
344 | { | |
345 | u64 value = get_unaligned((u64 *)addr); | |
346 | ||
347 | /* only want 6 bytes */ | |
348 | #ifdef __BIG_ENDIAN | |
d342894c | 349 | value >>= 16; |
321fb991 | 350 | #else |
351 | value <<= 16; | |
d342894c | 352 | #endif |
353 | return hash_64(value, FDB_HASH_BITS); | |
354 | } | |
355 | ||
356 | /* Hash chain to use given mac address */ | |
357 | static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan, | |
358 | const u8 *mac) | |
359 | { | |
360 | return &vxlan->fdb_head[eth_hash(mac)]; | |
361 | } | |
362 | ||
363 | /* Look up Ethernet address in forwarding table */ | |
014be2c8 | 364 | static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan, |
d342894c | 365 | const u8 *mac) |
366 | ||
367 | { | |
368 | struct hlist_head *head = vxlan_fdb_head(vxlan, mac); | |
369 | struct vxlan_fdb *f; | |
d342894c | 370 | |
b67bfe0d | 371 | hlist_for_each_entry_rcu(f, head, hlist) { |
d342894c | 372 | if (compare_ether_addr(mac, f->eth_addr) == 0) |
373 | return f; | |
374 | } | |
375 | ||
376 | return NULL; | |
377 | } | |
378 | ||
014be2c8 SS |
379 | static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan, |
380 | const u8 *mac) | |
381 | { | |
382 | struct vxlan_fdb *f; | |
383 | ||
384 | f = __vxlan_find_mac(vxlan, mac); | |
385 | if (f) | |
386 | f->used = jiffies; | |
387 | ||
388 | return f; | |
389 | } | |
390 | ||
a5e7c10a MR |
391 | /* caller should hold vxlan->hash_lock */ |
392 | static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f, | |
393 | __be32 ip, __be16 port, | |
394 | __u32 vni, __u32 ifindex) | |
6681712d | 395 | { |
3e61aa8f | 396 | struct vxlan_rdst *rd; |
6681712d | 397 | |
3e61aa8f | 398 | list_for_each_entry(rd, &f->remotes, list) { |
6681712d DS |
399 | if (rd->remote_ip == ip && |
400 | rd->remote_port == port && | |
401 | rd->remote_vni == vni && | |
402 | rd->remote_ifindex == ifindex) | |
a5e7c10a | 403 | return rd; |
6681712d | 404 | } |
3e61aa8f | 405 | |
a5e7c10a MR |
406 | return NULL; |
407 | } | |
408 | ||
409 | /* Add/update destinations for multicast */ | |
410 | static int vxlan_fdb_append(struct vxlan_fdb *f, | |
411 | __be32 ip, __be16 port, __u32 vni, __u32 ifindex) | |
412 | { | |
413 | struct vxlan_rdst *rd; | |
414 | ||
415 | rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex); | |
416 | if (rd) | |
417 | return 0; | |
418 | ||
6681712d DS |
419 | rd = kmalloc(sizeof(*rd), GFP_ATOMIC); |
420 | if (rd == NULL) | |
421 | return -ENOBUFS; | |
422 | rd->remote_ip = ip; | |
423 | rd->remote_port = port; | |
424 | rd->remote_vni = vni; | |
425 | rd->remote_ifindex = ifindex; | |
3e61aa8f SH |
426 | |
427 | list_add_tail_rcu(&rd->list, &f->remotes); | |
428 | ||
6681712d DS |
429 | return 1; |
430 | } | |
431 | ||
d342894c | 432 | /* Add new entry to forwarding table -- assumes lock held */ |
433 | static int vxlan_fdb_create(struct vxlan_dev *vxlan, | |
434 | const u8 *mac, __be32 ip, | |
6681712d | 435 | __u16 state, __u16 flags, |
73cf3317 | 436 | __be16 port, __u32 vni, __u32 ifindex, |
ae884082 | 437 | __u8 ndm_flags) |
d342894c | 438 | { |
439 | struct vxlan_fdb *f; | |
440 | int notify = 0; | |
441 | ||
014be2c8 | 442 | f = __vxlan_find_mac(vxlan, mac); |
d342894c | 443 | if (f) { |
444 | if (flags & NLM_F_EXCL) { | |
445 | netdev_dbg(vxlan->dev, | |
446 | "lost race to create %pM\n", mac); | |
447 | return -EEXIST; | |
448 | } | |
449 | if (f->state != state) { | |
450 | f->state = state; | |
451 | f->updated = jiffies; | |
452 | notify = 1; | |
453 | } | |
ae884082 DS |
454 | if (f->flags != ndm_flags) { |
455 | f->flags = ndm_flags; | |
456 | f->updated = jiffies; | |
457 | notify = 1; | |
458 | } | |
6681712d DS |
459 | if ((flags & NLM_F_APPEND) && |
460 | is_multicast_ether_addr(f->eth_addr)) { | |
461 | int rc = vxlan_fdb_append(f, ip, port, vni, ifindex); | |
462 | ||
463 | if (rc < 0) | |
464 | return rc; | |
465 | notify |= rc; | |
466 | } | |
d342894c | 467 | } else { |
468 | if (!(flags & NLM_F_CREATE)) | |
469 | return -ENOENT; | |
470 | ||
471 | if (vxlan->addrmax && vxlan->addrcnt >= vxlan->addrmax) | |
472 | return -ENOSPC; | |
473 | ||
474 | netdev_dbg(vxlan->dev, "add %pM -> %pI4\n", mac, &ip); | |
475 | f = kmalloc(sizeof(*f), GFP_ATOMIC); | |
476 | if (!f) | |
477 | return -ENOMEM; | |
478 | ||
479 | notify = 1; | |
d342894c | 480 | f->state = state; |
ae884082 | 481 | f->flags = ndm_flags; |
d342894c | 482 | f->updated = f->used = jiffies; |
3e61aa8f | 483 | INIT_LIST_HEAD(&f->remotes); |
d342894c | 484 | memcpy(f->eth_addr, mac, ETH_ALEN); |
485 | ||
3e61aa8f SH |
486 | vxlan_fdb_append(f, ip, port, vni, ifindex); |
487 | ||
d342894c | 488 | ++vxlan->addrcnt; |
489 | hlist_add_head_rcu(&f->hlist, | |
490 | vxlan_fdb_head(vxlan, mac)); | |
491 | } | |
492 | ||
493 | if (notify) | |
494 | vxlan_fdb_notify(vxlan, f, RTM_NEWNEIGH); | |
495 | ||
496 | return 0; | |
497 | } | |
498 | ||
6706c82e | 499 | static void vxlan_fdb_free(struct rcu_head *head) |
6681712d DS |
500 | { |
501 | struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu); | |
3e61aa8f | 502 | struct vxlan_rdst *rd, *nd; |
6681712d | 503 | |
3e61aa8f | 504 | list_for_each_entry_safe(rd, nd, &f->remotes, list) |
6681712d | 505 | kfree(rd); |
6681712d DS |
506 | kfree(f); |
507 | } | |
508 | ||
d342894c | 509 | static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f) |
510 | { | |
511 | netdev_dbg(vxlan->dev, | |
512 | "delete %pM\n", f->eth_addr); | |
513 | ||
514 | --vxlan->addrcnt; | |
515 | vxlan_fdb_notify(vxlan, f, RTM_DELNEIGH); | |
516 | ||
517 | hlist_del_rcu(&f->hlist); | |
6681712d | 518 | call_rcu(&f->rcu, vxlan_fdb_free); |
d342894c | 519 | } |
520 | ||
f0b074be MR |
521 | static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan, |
522 | __be32 *ip, __be16 *port, u32 *vni, u32 *ifindex) | |
d342894c | 523 | { |
6681712d | 524 | struct net *net = dev_net(vxlan->dev); |
d342894c | 525 | |
f0b074be MR |
526 | if (tb[NDA_DST]) { |
527 | if (nla_len(tb[NDA_DST]) != sizeof(__be32)) | |
528 | return -EAFNOSUPPORT; | |
d342894c | 529 | |
f0b074be MR |
530 | *ip = nla_get_be32(tb[NDA_DST]); |
531 | } else { | |
532 | *ip = htonl(INADDR_ANY); | |
533 | } | |
d342894c | 534 | |
6681712d | 535 | if (tb[NDA_PORT]) { |
73cf3317 | 536 | if (nla_len(tb[NDA_PORT]) != sizeof(__be16)) |
6681712d | 537 | return -EINVAL; |
f0b074be MR |
538 | *port = nla_get_be16(tb[NDA_PORT]); |
539 | } else { | |
540 | *port = vxlan->dst_port; | |
541 | } | |
6681712d DS |
542 | |
543 | if (tb[NDA_VNI]) { | |
544 | if (nla_len(tb[NDA_VNI]) != sizeof(u32)) | |
545 | return -EINVAL; | |
f0b074be MR |
546 | *vni = nla_get_u32(tb[NDA_VNI]); |
547 | } else { | |
548 | *vni = vxlan->default_dst.remote_vni; | |
549 | } | |
6681712d DS |
550 | |
551 | if (tb[NDA_IFINDEX]) { | |
5abb0029 | 552 | struct net_device *tdev; |
6681712d DS |
553 | |
554 | if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32)) | |
555 | return -EINVAL; | |
f0b074be MR |
556 | *ifindex = nla_get_u32(tb[NDA_IFINDEX]); |
557 | tdev = dev_get_by_index(net, *ifindex); | |
5abb0029 | 558 | if (!tdev) |
6681712d | 559 | return -EADDRNOTAVAIL; |
5abb0029 | 560 | dev_put(tdev); |
f0b074be MR |
561 | } else { |
562 | *ifindex = 0; | |
563 | } | |
564 | ||
565 | return 0; | |
566 | } | |
567 | ||
568 | /* Add static entry (via netlink) */ | |
569 | static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], | |
570 | struct net_device *dev, | |
571 | const unsigned char *addr, u16 flags) | |
572 | { | |
573 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
574 | /* struct net *net = dev_net(vxlan->dev); */ | |
575 | __be32 ip; | |
576 | __be16 port; | |
577 | u32 vni, ifindex; | |
578 | int err; | |
579 | ||
580 | if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) { | |
581 | pr_info("RTM_NEWNEIGH with invalid state %#x\n", | |
582 | ndm->ndm_state); | |
583 | return -EINVAL; | |
584 | } | |
585 | ||
586 | if (tb[NDA_DST] == NULL) | |
587 | return -EINVAL; | |
588 | ||
589 | err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex); | |
590 | if (err) | |
591 | return err; | |
6681712d | 592 | |
d342894c | 593 | spin_lock_bh(&vxlan->hash_lock); |
73cf3317 | 594 | err = vxlan_fdb_create(vxlan, addr, ip, ndm->ndm_state, flags, |
595 | port, vni, ifindex, ndm->ndm_flags); | |
d342894c | 596 | spin_unlock_bh(&vxlan->hash_lock); |
597 | ||
598 | return err; | |
599 | } | |
600 | ||
601 | /* Delete entry (via netlink) */ | |
1690be63 VY |
602 | static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[], |
603 | struct net_device *dev, | |
d342894c | 604 | const unsigned char *addr) |
605 | { | |
606 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
607 | struct vxlan_fdb *f; | |
608 | int err = -ENOENT; | |
609 | ||
610 | spin_lock_bh(&vxlan->hash_lock); | |
611 | f = vxlan_find_mac(vxlan, addr); | |
612 | if (f) { | |
613 | vxlan_fdb_destroy(vxlan, f); | |
614 | err = 0; | |
615 | } | |
616 | spin_unlock_bh(&vxlan->hash_lock); | |
617 | ||
618 | return err; | |
619 | } | |
620 | ||
621 | /* Dump forwarding table */ | |
622 | static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb, | |
623 | struct net_device *dev, int idx) | |
624 | { | |
625 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
626 | unsigned int h; | |
627 | ||
628 | for (h = 0; h < FDB_HASH_SIZE; ++h) { | |
629 | struct vxlan_fdb *f; | |
d342894c | 630 | int err; |
631 | ||
b67bfe0d | 632 | hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) { |
6681712d | 633 | struct vxlan_rdst *rd; |
6681712d | 634 | |
3e61aa8f SH |
635 | if (idx < cb->args[0]) |
636 | goto skip; | |
637 | ||
638 | list_for_each_entry_rcu(rd, &f->remotes, list) { | |
6681712d DS |
639 | err = vxlan_fdb_info(skb, vxlan, f, |
640 | NETLINK_CB(cb->skb).portid, | |
641 | cb->nlh->nlmsg_seq, | |
642 | RTM_NEWNEIGH, | |
643 | NLM_F_MULTI, rd); | |
644 | if (err < 0) | |
3e61aa8f | 645 | goto out; |
6681712d | 646 | } |
3e61aa8f SH |
647 | skip: |
648 | ++idx; | |
d342894c | 649 | } |
650 | } | |
3e61aa8f | 651 | out: |
d342894c | 652 | return idx; |
653 | } | |
654 | ||
655 | /* Watch incoming packets to learn mapping between Ethernet address | |
656 | * and Tunnel endpoint. | |
26a41ae6 | 657 | * Return true if packet is bogus and should be droppped. |
d342894c | 658 | */ |
26a41ae6 | 659 | static bool vxlan_snoop(struct net_device *dev, |
d342894c | 660 | __be32 src_ip, const u8 *src_mac) |
661 | { | |
662 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
663 | struct vxlan_fdb *f; | |
d342894c | 664 | |
665 | f = vxlan_find_mac(vxlan, src_mac); | |
666 | if (likely(f)) { | |
3e61aa8f SH |
667 | struct vxlan_rdst *rdst = first_remote(f); |
668 | ||
669 | if (likely(rdst->remote_ip == src_ip)) | |
26a41ae6 | 670 | return false; |
671 | ||
672 | /* Don't migrate static entries, drop packets */ | |
eb064c3b | 673 | if (f->state & NUD_NOARP) |
26a41ae6 | 674 | return true; |
d342894c | 675 | |
676 | if (net_ratelimit()) | |
677 | netdev_info(dev, | |
678 | "%pM migrated from %pI4 to %pI4\n", | |
3e61aa8f | 679 | src_mac, &rdst->remote_ip, &src_ip); |
d342894c | 680 | |
3e61aa8f | 681 | rdst->remote_ip = src_ip; |
d342894c | 682 | f->updated = jiffies; |
8385f50a | 683 | vxlan_fdb_notify(vxlan, f, RTM_NEWNEIGH); |
d342894c | 684 | } else { |
685 | /* learned new entry */ | |
686 | spin_lock(&vxlan->hash_lock); | |
3bf74b1a | 687 | |
688 | /* close off race between vxlan_flush and incoming packets */ | |
689 | if (netif_running(dev)) | |
690 | vxlan_fdb_create(vxlan, src_mac, src_ip, | |
691 | NUD_REACHABLE, | |
692 | NLM_F_EXCL|NLM_F_CREATE, | |
693 | vxlan->dst_port, | |
694 | vxlan->default_dst.remote_vni, | |
695 | 0, NTF_SELF); | |
d342894c | 696 | spin_unlock(&vxlan->hash_lock); |
697 | } | |
26a41ae6 | 698 | |
699 | return false; | |
d342894c | 700 | } |
701 | ||
702 | ||
703 | /* See if multicast group is already in use by other ID */ | |
7c47cedf | 704 | static bool vxlan_group_used(struct vxlan_net *vn, __be32 remote_ip) |
d342894c | 705 | { |
553675fb | 706 | struct vxlan_dev *vxlan; |
d342894c | 707 | |
553675fb | 708 | list_for_each_entry(vxlan, &vn->vxlan_list, next) { |
553675fb | 709 | if (!netif_running(vxlan->dev)) |
710 | continue; | |
d342894c | 711 | |
7c47cedf | 712 | if (vxlan->default_dst.remote_ip == remote_ip) |
553675fb | 713 | return true; |
714 | } | |
d342894c | 715 | |
716 | return false; | |
717 | } | |
718 | ||
7c47cedf | 719 | static void vxlan_sock_hold(struct vxlan_sock *vs) |
d342894c | 720 | { |
7c47cedf SH |
721 | atomic_inc(&vs->refcnt); |
722 | } | |
d342894c | 723 | |
1c51a915 | 724 | static void vxlan_sock_release(struct vxlan_net *vn, struct vxlan_sock *vs) |
7c47cedf SH |
725 | { |
726 | if (!atomic_dec_and_test(&vs->refcnt)) | |
727 | return; | |
d342894c | 728 | |
1c51a915 | 729 | spin_lock(&vn->sock_lock); |
7c47cedf | 730 | hlist_del_rcu(&vs->hlist); |
1c51a915 SH |
731 | spin_unlock(&vn->sock_lock); |
732 | ||
7c47cedf | 733 | queue_work(vxlan_wq, &vs->del_work); |
d342894c | 734 | } |
735 | ||
7c47cedf SH |
736 | /* Callback to update multicast group membership. |
737 | * Scheduled when vxlan goes up/down. | |
738 | */ | |
739 | static void vxlan_igmp_work(struct work_struct *work) | |
d342894c | 740 | { |
7c47cedf SH |
741 | struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_work); |
742 | struct vxlan_net *vn = net_generic(dev_net(vxlan->dev), vxlan_net_id); | |
743 | struct vxlan_sock *vs = vxlan->vn_sock; | |
744 | struct sock *sk = vs->sock->sk; | |
d342894c | 745 | struct ip_mreqn mreq = { |
c7995c43 AW |
746 | .imr_multiaddr.s_addr = vxlan->default_dst.remote_ip, |
747 | .imr_ifindex = vxlan->default_dst.remote_ifindex, | |
d342894c | 748 | }; |
749 | ||
d342894c | 750 | lock_sock(sk); |
7c47cedf SH |
751 | if (vxlan_group_used(vn, vxlan->default_dst.remote_ip)) |
752 | ip_mc_join_group(sk, &mreq); | |
753 | else | |
754 | ip_mc_leave_group(sk, &mreq); | |
d342894c | 755 | release_sock(sk); |
d342894c | 756 | |
1c51a915 | 757 | vxlan_sock_release(vn, vs); |
7c47cedf | 758 | dev_put(vxlan->dev); |
d342894c | 759 | } |
760 | ||
761 | /* Callback from net/ipv4/udp.c to receive packets */ | |
762 | static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb) | |
763 | { | |
764 | struct iphdr *oip; | |
765 | struct vxlanhdr *vxh; | |
766 | struct vxlan_dev *vxlan; | |
e8171045 | 767 | struct pcpu_tstats *stats; |
553675fb | 768 | __be16 port; |
d342894c | 769 | __u32 vni; |
770 | int err; | |
771 | ||
772 | /* pop off outer UDP header */ | |
773 | __skb_pull(skb, sizeof(struct udphdr)); | |
774 | ||
775 | /* Need Vxlan and inner Ethernet header to be present */ | |
776 | if (!pskb_may_pull(skb, sizeof(struct vxlanhdr))) | |
777 | goto error; | |
778 | ||
779 | /* Drop packets with reserved bits set */ | |
780 | vxh = (struct vxlanhdr *) skb->data; | |
781 | if (vxh->vx_flags != htonl(VXLAN_FLAGS) || | |
782 | (vxh->vx_vni & htonl(0xff))) { | |
783 | netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n", | |
784 | ntohl(vxh->vx_flags), ntohl(vxh->vx_vni)); | |
785 | goto error; | |
786 | } | |
787 | ||
788 | __skb_pull(skb, sizeof(struct vxlanhdr)); | |
d342894c | 789 | |
790 | /* Is this VNI defined? */ | |
791 | vni = ntohl(vxh->vx_vni) >> 8; | |
553675fb | 792 | port = inet_sk(sk)->inet_sport; |
793 | vxlan = vxlan_find_vni(sock_net(sk), vni, port); | |
d342894c | 794 | if (!vxlan) { |
553675fb | 795 | netdev_dbg(skb->dev, "unknown vni %d port %u\n", |
796 | vni, ntohs(port)); | |
d342894c | 797 | goto drop; |
798 | } | |
799 | ||
800 | if (!pskb_may_pull(skb, ETH_HLEN)) { | |
801 | vxlan->dev->stats.rx_length_errors++; | |
802 | vxlan->dev->stats.rx_errors++; | |
803 | goto drop; | |
804 | } | |
805 | ||
e4f67add DS |
806 | skb_reset_mac_header(skb); |
807 | ||
d342894c | 808 | /* Re-examine inner Ethernet packet */ |
809 | oip = ip_hdr(skb); | |
810 | skb->protocol = eth_type_trans(skb, vxlan->dev); | |
d342894c | 811 | |
812 | /* Ignore packet loops (and multicast echo) */ | |
813 | if (compare_ether_addr(eth_hdr(skb)->h_source, | |
814 | vxlan->dev->dev_addr) == 0) | |
815 | goto drop; | |
816 | ||
26a41ae6 | 817 | if ((vxlan->flags & VXLAN_F_LEARN) && |
818 | vxlan_snoop(skb->dev, oip->saddr, eth_hdr(skb)->h_source)) | |
819 | goto drop; | |
d342894c | 820 | |
821 | __skb_tunnel_rx(skb, vxlan->dev); | |
822 | skb_reset_network_header(skb); | |
0afb1666 JG |
823 | |
824 | /* If the NIC driver gave us an encapsulated packet with | |
825 | * CHECKSUM_UNNECESSARY and Rx checksum feature is enabled, | |
826 | * leave the CHECKSUM_UNNECESSARY, the device checksummed it | |
827 | * for us. Otherwise force the upper layers to verify it. | |
828 | */ | |
829 | if (skb->ip_summed != CHECKSUM_UNNECESSARY || !skb->encapsulation || | |
830 | !(vxlan->dev->features & NETIF_F_RXCSUM)) | |
831 | skb->ip_summed = CHECKSUM_NONE; | |
832 | ||
833 | skb->encapsulation = 0; | |
d342894c | 834 | |
835 | err = IP_ECN_decapsulate(oip, skb); | |
836 | if (unlikely(err)) { | |
837 | if (log_ecn_error) | |
838 | net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", | |
839 | &oip->saddr, oip->tos); | |
840 | if (err > 1) { | |
841 | ++vxlan->dev->stats.rx_frame_errors; | |
842 | ++vxlan->dev->stats.rx_errors; | |
843 | goto drop; | |
844 | } | |
845 | } | |
846 | ||
e8171045 | 847 | stats = this_cpu_ptr(vxlan->dev->tstats); |
d342894c | 848 | u64_stats_update_begin(&stats->syncp); |
849 | stats->rx_packets++; | |
850 | stats->rx_bytes += skb->len; | |
851 | u64_stats_update_end(&stats->syncp); | |
852 | ||
853 | netif_rx(skb); | |
854 | ||
855 | return 0; | |
856 | error: | |
857 | /* Put UDP header back */ | |
858 | __skb_push(skb, sizeof(struct udphdr)); | |
859 | ||
860 | return 1; | |
861 | drop: | |
862 | /* Consume bad packet */ | |
863 | kfree_skb(skb); | |
864 | return 0; | |
865 | } | |
866 | ||
e4f67add DS |
867 | static int arp_reduce(struct net_device *dev, struct sk_buff *skb) |
868 | { | |
869 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
870 | struct arphdr *parp; | |
871 | u8 *arpptr, *sha; | |
872 | __be32 sip, tip; | |
873 | struct neighbour *n; | |
874 | ||
875 | if (dev->flags & IFF_NOARP) | |
876 | goto out; | |
877 | ||
878 | if (!pskb_may_pull(skb, arp_hdr_len(dev))) { | |
879 | dev->stats.tx_dropped++; | |
880 | goto out; | |
881 | } | |
882 | parp = arp_hdr(skb); | |
883 | ||
884 | if ((parp->ar_hrd != htons(ARPHRD_ETHER) && | |
885 | parp->ar_hrd != htons(ARPHRD_IEEE802)) || | |
886 | parp->ar_pro != htons(ETH_P_IP) || | |
887 | parp->ar_op != htons(ARPOP_REQUEST) || | |
888 | parp->ar_hln != dev->addr_len || | |
889 | parp->ar_pln != 4) | |
890 | goto out; | |
891 | arpptr = (u8 *)parp + sizeof(struct arphdr); | |
892 | sha = arpptr; | |
893 | arpptr += dev->addr_len; /* sha */ | |
894 | memcpy(&sip, arpptr, sizeof(sip)); | |
895 | arpptr += sizeof(sip); | |
896 | arpptr += dev->addr_len; /* tha */ | |
897 | memcpy(&tip, arpptr, sizeof(tip)); | |
898 | ||
899 | if (ipv4_is_loopback(tip) || | |
900 | ipv4_is_multicast(tip)) | |
901 | goto out; | |
902 | ||
903 | n = neigh_lookup(&arp_tbl, &tip, dev); | |
904 | ||
905 | if (n) { | |
e4f67add DS |
906 | struct vxlan_fdb *f; |
907 | struct sk_buff *reply; | |
908 | ||
909 | if (!(n->nud_state & NUD_CONNECTED)) { | |
910 | neigh_release(n); | |
911 | goto out; | |
912 | } | |
913 | ||
914 | f = vxlan_find_mac(vxlan, n->ha); | |
3e61aa8f | 915 | if (f && first_remote(f)->remote_ip == htonl(INADDR_ANY)) { |
e4f67add DS |
916 | /* bridge-local neighbor */ |
917 | neigh_release(n); | |
918 | goto out; | |
919 | } | |
920 | ||
921 | reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha, | |
922 | n->ha, sha); | |
923 | ||
924 | neigh_release(n); | |
925 | ||
926 | skb_reset_mac_header(reply); | |
927 | __skb_pull(reply, skb_network_offset(reply)); | |
928 | reply->ip_summed = CHECKSUM_UNNECESSARY; | |
929 | reply->pkt_type = PACKET_HOST; | |
930 | ||
931 | if (netif_rx_ni(reply) == NET_RX_DROP) | |
932 | dev->stats.rx_dropped++; | |
933 | } else if (vxlan->flags & VXLAN_F_L3MISS) | |
934 | vxlan_ip_miss(dev, tip); | |
935 | out: | |
936 | consume_skb(skb); | |
937 | return NETDEV_TX_OK; | |
938 | } | |
939 | ||
940 | static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb) | |
941 | { | |
942 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
943 | struct neighbour *n; | |
944 | struct iphdr *pip; | |
945 | ||
946 | if (is_multicast_ether_addr(eth_hdr(skb)->h_dest)) | |
947 | return false; | |
948 | ||
949 | n = NULL; | |
950 | switch (ntohs(eth_hdr(skb)->h_proto)) { | |
951 | case ETH_P_IP: | |
952 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
953 | return false; | |
954 | pip = ip_hdr(skb); | |
955 | n = neigh_lookup(&arp_tbl, &pip->daddr, dev); | |
956 | break; | |
957 | default: | |
958 | return false; | |
959 | } | |
960 | ||
961 | if (n) { | |
962 | bool diff; | |
963 | ||
964 | diff = compare_ether_addr(eth_hdr(skb)->h_dest, n->ha) != 0; | |
965 | if (diff) { | |
966 | memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest, | |
967 | dev->addr_len); | |
968 | memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len); | |
969 | } | |
970 | neigh_release(n); | |
971 | return diff; | |
972 | } else if (vxlan->flags & VXLAN_F_L3MISS) | |
973 | vxlan_ip_miss(dev, pip->daddr); | |
974 | return false; | |
975 | } | |
976 | ||
553675fb | 977 | static void vxlan_sock_put(struct sk_buff *skb) |
1cad8715 | 978 | { |
979 | sock_put(skb->sk); | |
980 | } | |
981 | ||
982 | /* On transmit, associate with the tunnel socket */ | |
983 | static void vxlan_set_owner(struct net_device *dev, struct sk_buff *skb) | |
984 | { | |
553675fb | 985 | struct vxlan_dev *vxlan = netdev_priv(dev); |
986 | struct sock *sk = vxlan->vn_sock->sock->sk; | |
1cad8715 | 987 | |
988 | skb_orphan(skb); | |
989 | sock_hold(sk); | |
990 | skb->sk = sk; | |
553675fb | 991 | skb->destructor = vxlan_sock_put; |
1cad8715 | 992 | } |
993 | ||
05f47d69 | 994 | /* Compute source port for outgoing packet |
995 | * first choice to use L4 flow hash since it will spread | |
996 | * better and maybe available from hardware | |
997 | * secondary choice is to use jhash on the Ethernet header | |
998 | */ | |
7d836a76 | 999 | static __be16 vxlan_src_port(const struct vxlan_dev *vxlan, struct sk_buff *skb) |
05f47d69 | 1000 | { |
1001 | unsigned int range = (vxlan->port_max - vxlan->port_min) + 1; | |
1002 | u32 hash; | |
1003 | ||
1004 | hash = skb_get_rxhash(skb); | |
1005 | if (!hash) | |
1006 | hash = jhash(skb->data, 2 * ETH_ALEN, | |
1007 | (__force u32) skb->protocol); | |
1008 | ||
7d836a76 | 1009 | return htons((((u64) hash * range) >> 32) + vxlan->port_min); |
05f47d69 | 1010 | } |
1011 | ||
05c0db08 PS |
1012 | static int handle_offloads(struct sk_buff *skb) |
1013 | { | |
1014 | if (skb_is_gso(skb)) { | |
1015 | int err = skb_unclone(skb, GFP_ATOMIC); | |
1016 | if (unlikely(err)) | |
1017 | return err; | |
1018 | ||
f6ace502 | 1019 | skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_TUNNEL; |
05c0db08 PS |
1020 | } else if (skb->ip_summed != CHECKSUM_PARTIAL) |
1021 | skb->ip_summed = CHECKSUM_NONE; | |
1022 | ||
1023 | return 0; | |
1024 | } | |
1025 | ||
9dcc71e1 SS |
1026 | /* Bypass encapsulation if the destination is local */ |
1027 | static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan, | |
1028 | struct vxlan_dev *dst_vxlan) | |
1029 | { | |
1030 | struct pcpu_tstats *tx_stats = this_cpu_ptr(src_vxlan->dev->tstats); | |
1031 | struct pcpu_tstats *rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats); | |
1032 | ||
1033 | skb->pkt_type = PACKET_HOST; | |
1034 | skb->encapsulation = 0; | |
1035 | skb->dev = dst_vxlan->dev; | |
1036 | __skb_pull(skb, skb_network_offset(skb)); | |
1037 | ||
1038 | if (dst_vxlan->flags & VXLAN_F_LEARN) | |
9d9f163c MR |
1039 | vxlan_snoop(skb->dev, htonl(INADDR_LOOPBACK), |
1040 | eth_hdr(skb)->h_source); | |
9dcc71e1 SS |
1041 | |
1042 | u64_stats_update_begin(&tx_stats->syncp); | |
1043 | tx_stats->tx_packets++; | |
1044 | tx_stats->tx_bytes += skb->len; | |
1045 | u64_stats_update_end(&tx_stats->syncp); | |
1046 | ||
1047 | if (netif_rx(skb) == NET_RX_SUCCESS) { | |
1048 | u64_stats_update_begin(&rx_stats->syncp); | |
1049 | rx_stats->rx_packets++; | |
1050 | rx_stats->rx_bytes += skb->len; | |
1051 | u64_stats_update_end(&rx_stats->syncp); | |
1052 | } else { | |
1053 | skb->dev->stats.rx_dropped++; | |
1054 | } | |
1055 | } | |
1056 | ||
4ad16930 SH |
1057 | static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev, |
1058 | struct vxlan_rdst *rdst, bool did_rsc) | |
d342894c | 1059 | { |
1060 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1061 | struct rtable *rt; | |
d342894c | 1062 | const struct iphdr *old_iph; |
d342894c | 1063 | struct vxlanhdr *vxh; |
1064 | struct udphdr *uh; | |
1065 | struct flowi4 fl4; | |
d342894c | 1066 | __be32 dst; |
7d836a76 | 1067 | __be16 src_port, dst_port; |
234f5b73 | 1068 | u32 vni; |
d342894c | 1069 | __be16 df = 0; |
1070 | __u8 tos, ttl; | |
0e6fbc5b | 1071 | int err; |
d342894c | 1072 | |
823aa873 | 1073 | dst_port = rdst->remote_port ? rdst->remote_port : vxlan->dst_port; |
6681712d DS |
1074 | vni = rdst->remote_vni; |
1075 | dst = rdst->remote_ip; | |
e4f67add DS |
1076 | |
1077 | if (!dst) { | |
1078 | if (did_rsc) { | |
e4f67add | 1079 | /* short-circuited back to local bridge */ |
9dcc71e1 | 1080 | vxlan_encap_bypass(skb, vxlan, vxlan); |
4ad16930 | 1081 | return; |
e4f67add | 1082 | } |
ef59febe | 1083 | goto drop; |
e4f67add | 1084 | } |
ef59febe | 1085 | |
d6727fe3 JG |
1086 | if (!skb->encapsulation) { |
1087 | skb_reset_inner_headers(skb); | |
1088 | skb->encapsulation = 1; | |
1089 | } | |
1090 | ||
d342894c | 1091 | /* Need space for new headers (invalidates iph ptr) */ |
1092 | if (skb_cow_head(skb, VXLAN_HEADROOM)) | |
1093 | goto drop; | |
1094 | ||
d342894c | 1095 | old_iph = ip_hdr(skb); |
1096 | ||
d342894c | 1097 | ttl = vxlan->ttl; |
1098 | if (!ttl && IN_MULTICAST(ntohl(dst))) | |
1099 | ttl = 1; | |
1100 | ||
1101 | tos = vxlan->tos; | |
1102 | if (tos == 1) | |
206aaafc | 1103 | tos = ip_tunnel_get_dsfield(old_iph, skb); |
d342894c | 1104 | |
05f47d69 | 1105 | src_port = vxlan_src_port(vxlan, skb); |
d342894c | 1106 | |
ca78f181 | 1107 | memset(&fl4, 0, sizeof(fl4)); |
6681712d | 1108 | fl4.flowi4_oif = rdst->remote_ifindex; |
ca78f181 | 1109 | fl4.flowi4_tos = RT_TOS(tos); |
1110 | fl4.daddr = dst; | |
1111 | fl4.saddr = vxlan->saddr; | |
1112 | ||
1113 | rt = ip_route_output_key(dev_net(dev), &fl4); | |
d342894c | 1114 | if (IS_ERR(rt)) { |
1115 | netdev_dbg(dev, "no route to %pI4\n", &dst); | |
1116 | dev->stats.tx_carrier_errors++; | |
1117 | goto tx_error; | |
1118 | } | |
1119 | ||
1120 | if (rt->dst.dev == dev) { | |
1121 | netdev_dbg(dev, "circular route to %pI4\n", &dst); | |
1122 | ip_rt_put(rt); | |
1123 | dev->stats.collisions++; | |
1124 | goto tx_error; | |
1125 | } | |
1126 | ||
9dcc71e1 | 1127 | /* Bypass encapsulation if the destination is local */ |
ab09a6d0 MR |
1128 | if (rt->rt_flags & RTCF_LOCAL && |
1129 | !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) { | |
9dcc71e1 SS |
1130 | struct vxlan_dev *dst_vxlan; |
1131 | ||
1132 | ip_rt_put(rt); | |
553675fb | 1133 | dst_vxlan = vxlan_find_vni(dev_net(dev), vni, dst_port); |
9dcc71e1 SS |
1134 | if (!dst_vxlan) |
1135 | goto tx_error; | |
1136 | vxlan_encap_bypass(skb, vxlan, dst_vxlan); | |
4ad16930 | 1137 | return; |
9dcc71e1 | 1138 | } |
d342894c | 1139 | vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh)); |
1140 | vxh->vx_flags = htonl(VXLAN_FLAGS); | |
6681712d | 1141 | vxh->vx_vni = htonl(vni << 8); |
d342894c | 1142 | |
1143 | __skb_push(skb, sizeof(*uh)); | |
1144 | skb_reset_transport_header(skb); | |
1145 | uh = udp_hdr(skb); | |
1146 | ||
73cf3317 | 1147 | uh->dest = dst_port; |
7d836a76 | 1148 | uh->source = src_port; |
d342894c | 1149 | |
1150 | uh->len = htons(skb->len); | |
1151 | uh->check = 0; | |
1152 | ||
1cad8715 | 1153 | vxlan_set_owner(dev, skb); |
1154 | ||
05c0db08 PS |
1155 | if (handle_offloads(skb)) |
1156 | goto drop; | |
d342894c | 1157 | |
0e6fbc5b PS |
1158 | tos = ip_tunnel_ecn_encap(tos, old_iph, skb); |
1159 | ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); | |
1160 | ||
1161 | err = iptunnel_xmit(dev_net(dev), rt, skb, fl4.saddr, dst, | |
1162 | IPPROTO_UDP, tos, ttl, df); | |
1163 | iptunnel_xmit_stats(err, &dev->stats, dev->tstats); | |
1164 | ||
4ad16930 | 1165 | return; |
d342894c | 1166 | |
1167 | drop: | |
1168 | dev->stats.tx_dropped++; | |
1169 | goto tx_free; | |
1170 | ||
1171 | tx_error: | |
1172 | dev->stats.tx_errors++; | |
1173 | tx_free: | |
1174 | dev_kfree_skb(skb); | |
d342894c | 1175 | } |
1176 | ||
6681712d DS |
1177 | /* Transmit local packets over Vxlan |
1178 | * | |
1179 | * Outer IP header inherits ECN and DF from inner header. | |
1180 | * Outer UDP destination is the VXLAN assigned port. | |
1181 | * source port is based on hash of flow | |
1182 | */ | |
1183 | static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev) | |
1184 | { | |
1185 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1186 | struct ethhdr *eth; | |
1187 | bool did_rsc = false; | |
afbd8bae | 1188 | struct vxlan_rdst *rdst; |
6681712d | 1189 | struct vxlan_fdb *f; |
6681712d DS |
1190 | |
1191 | skb_reset_mac_header(skb); | |
1192 | eth = eth_hdr(skb); | |
1193 | ||
1194 | if ((vxlan->flags & VXLAN_F_PROXY) && ntohs(eth->h_proto) == ETH_P_ARP) | |
1195 | return arp_reduce(dev, skb); | |
6681712d DS |
1196 | |
1197 | f = vxlan_find_mac(vxlan, eth->h_dest); | |
ae884082 DS |
1198 | did_rsc = false; |
1199 | ||
1200 | if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) && | |
1201 | ntohs(eth->h_proto) == ETH_P_IP) { | |
1202 | did_rsc = route_shortcircuit(dev, skb); | |
1203 | if (did_rsc) | |
1204 | f = vxlan_find_mac(vxlan, eth->h_dest); | |
1205 | } | |
1206 | ||
6681712d | 1207 | if (f == NULL) { |
afbd8bae MR |
1208 | f = vxlan_find_mac(vxlan, all_zeros_mac); |
1209 | if (f == NULL) { | |
1210 | if ((vxlan->flags & VXLAN_F_L2MISS) && | |
1211 | !is_multicast_ether_addr(eth->h_dest)) | |
1212 | vxlan_fdb_miss(vxlan, eth->h_dest); | |
1213 | ||
1214 | dev->stats.tx_dropped++; | |
1215 | dev_kfree_skb(skb); | |
1216 | return NETDEV_TX_OK; | |
1217 | } | |
1218 | } | |
6681712d | 1219 | |
afbd8bae MR |
1220 | list_for_each_entry_rcu(rdst, &f->remotes, list) { |
1221 | struct sk_buff *skb1; | |
6681712d | 1222 | |
afbd8bae MR |
1223 | skb1 = skb_clone(skb, GFP_ATOMIC); |
1224 | if (skb1) | |
1225 | vxlan_xmit_one(skb1, dev, rdst, did_rsc); | |
6681712d DS |
1226 | } |
1227 | ||
afbd8bae | 1228 | dev_kfree_skb(skb); |
4ad16930 | 1229 | return NETDEV_TX_OK; |
6681712d DS |
1230 | } |
1231 | ||
d342894c | 1232 | /* Walk the forwarding table and purge stale entries */ |
1233 | static void vxlan_cleanup(unsigned long arg) | |
1234 | { | |
1235 | struct vxlan_dev *vxlan = (struct vxlan_dev *) arg; | |
1236 | unsigned long next_timer = jiffies + FDB_AGE_INTERVAL; | |
1237 | unsigned int h; | |
1238 | ||
1239 | if (!netif_running(vxlan->dev)) | |
1240 | return; | |
1241 | ||
1242 | spin_lock_bh(&vxlan->hash_lock); | |
1243 | for (h = 0; h < FDB_HASH_SIZE; ++h) { | |
1244 | struct hlist_node *p, *n; | |
1245 | hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) { | |
1246 | struct vxlan_fdb *f | |
1247 | = container_of(p, struct vxlan_fdb, hlist); | |
1248 | unsigned long timeout; | |
1249 | ||
3c172868 | 1250 | if (f->state & NUD_PERMANENT) |
d342894c | 1251 | continue; |
1252 | ||
1253 | timeout = f->used + vxlan->age_interval * HZ; | |
1254 | if (time_before_eq(timeout, jiffies)) { | |
1255 | netdev_dbg(vxlan->dev, | |
1256 | "garbage collect %pM\n", | |
1257 | f->eth_addr); | |
1258 | f->state = NUD_STALE; | |
1259 | vxlan_fdb_destroy(vxlan, f); | |
1260 | } else if (time_before(timeout, next_timer)) | |
1261 | next_timer = timeout; | |
1262 | } | |
1263 | } | |
1264 | spin_unlock_bh(&vxlan->hash_lock); | |
1265 | ||
1266 | mod_timer(&vxlan->age_timer, next_timer); | |
1267 | } | |
1268 | ||
1269 | /* Setup stats when device is created */ | |
1270 | static int vxlan_init(struct net_device *dev) | |
1271 | { | |
1c51a915 SH |
1272 | struct vxlan_dev *vxlan = netdev_priv(dev); |
1273 | struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id); | |
1274 | struct vxlan_sock *vs; | |
1275 | __u32 vni = vxlan->default_dst.remote_vni; | |
1276 | ||
e8171045 PS |
1277 | dev->tstats = alloc_percpu(struct pcpu_tstats); |
1278 | if (!dev->tstats) | |
d342894c | 1279 | return -ENOMEM; |
1280 | ||
1c51a915 SH |
1281 | spin_lock(&vn->sock_lock); |
1282 | vs = vxlan_find_port(dev_net(dev), vxlan->dst_port); | |
1283 | if (vs) { | |
1284 | /* If we have a socket with same port already, reuse it */ | |
1285 | atomic_inc(&vs->refcnt); | |
1286 | vxlan->vn_sock = vs; | |
1287 | hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni)); | |
1288 | } else { | |
1289 | /* otherwise make new socket outside of RTNL */ | |
1290 | dev_hold(dev); | |
1291 | queue_work(vxlan_wq, &vxlan->sock_work); | |
1292 | } | |
1293 | spin_unlock(&vn->sock_lock); | |
1294 | ||
d342894c | 1295 | return 0; |
1296 | } | |
1297 | ||
afbd8bae MR |
1298 | static void vxlan_fdb_delete_defualt(struct vxlan_dev *vxlan) |
1299 | { | |
1300 | struct vxlan_fdb *f; | |
1301 | ||
1302 | spin_lock_bh(&vxlan->hash_lock); | |
1303 | f = __vxlan_find_mac(vxlan, all_zeros_mac); | |
1304 | if (f) | |
1305 | vxlan_fdb_destroy(vxlan, f); | |
1306 | spin_unlock_bh(&vxlan->hash_lock); | |
1307 | } | |
1308 | ||
ebf4063e SH |
1309 | static void vxlan_uninit(struct net_device *dev) |
1310 | { | |
1311 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1312 | struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id); | |
1313 | struct vxlan_sock *vs = vxlan->vn_sock; | |
1314 | ||
afbd8bae MR |
1315 | vxlan_fdb_delete_defualt(vxlan); |
1316 | ||
ebf4063e SH |
1317 | if (vs) |
1318 | vxlan_sock_release(vn, vs); | |
1319 | free_percpu(dev->tstats); | |
1320 | } | |
1321 | ||
d342894c | 1322 | /* Start ageing timer and join group when device is brought up */ |
1323 | static int vxlan_open(struct net_device *dev) | |
1324 | { | |
1325 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1c51a915 SH |
1326 | struct vxlan_sock *vs = vxlan->vn_sock; |
1327 | ||
1328 | /* socket hasn't been created */ | |
1329 | if (!vs) | |
1330 | return -ENOTCONN; | |
d342894c | 1331 | |
c7995c43 | 1332 | if (IN_MULTICAST(ntohl(vxlan->default_dst.remote_ip))) { |
1c51a915 | 1333 | vxlan_sock_hold(vs); |
7c47cedf SH |
1334 | dev_hold(dev); |
1335 | queue_work(vxlan_wq, &vxlan->igmp_work); | |
d342894c | 1336 | } |
1337 | ||
1338 | if (vxlan->age_interval) | |
1339 | mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL); | |
1340 | ||
1341 | return 0; | |
1342 | } | |
1343 | ||
1344 | /* Purge the forwarding table */ | |
1345 | static void vxlan_flush(struct vxlan_dev *vxlan) | |
1346 | { | |
31fec5aa | 1347 | unsigned int h; |
d342894c | 1348 | |
1349 | spin_lock_bh(&vxlan->hash_lock); | |
1350 | for (h = 0; h < FDB_HASH_SIZE; ++h) { | |
1351 | struct hlist_node *p, *n; | |
1352 | hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) { | |
1353 | struct vxlan_fdb *f | |
1354 | = container_of(p, struct vxlan_fdb, hlist); | |
afbd8bae MR |
1355 | /* the all_zeros_mac entry is deleted at vxlan_uninit */ |
1356 | if (!is_zero_ether_addr(f->eth_addr)) | |
1357 | vxlan_fdb_destroy(vxlan, f); | |
d342894c | 1358 | } |
1359 | } | |
1360 | spin_unlock_bh(&vxlan->hash_lock); | |
1361 | } | |
1362 | ||
1363 | /* Cleanup timer and forwarding table on shutdown */ | |
1364 | static int vxlan_stop(struct net_device *dev) | |
1365 | { | |
1366 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1c51a915 | 1367 | struct vxlan_sock *vs = vxlan->vn_sock; |
d342894c | 1368 | |
1c51a915 SH |
1369 | if (vs && IN_MULTICAST(ntohl(vxlan->default_dst.remote_ip))) { |
1370 | vxlan_sock_hold(vs); | |
7c47cedf SH |
1371 | dev_hold(dev); |
1372 | queue_work(vxlan_wq, &vxlan->igmp_work); | |
1373 | } | |
d342894c | 1374 | |
1375 | del_timer_sync(&vxlan->age_timer); | |
1376 | ||
1377 | vxlan_flush(vxlan); | |
1378 | ||
1379 | return 0; | |
1380 | } | |
1381 | ||
d342894c | 1382 | /* Stub, nothing needs to be done. */ |
1383 | static void vxlan_set_multicast_list(struct net_device *dev) | |
1384 | { | |
1385 | } | |
1386 | ||
1387 | static const struct net_device_ops vxlan_netdev_ops = { | |
1388 | .ndo_init = vxlan_init, | |
ebf4063e | 1389 | .ndo_uninit = vxlan_uninit, |
d342894c | 1390 | .ndo_open = vxlan_open, |
1391 | .ndo_stop = vxlan_stop, | |
1392 | .ndo_start_xmit = vxlan_xmit, | |
e8171045 | 1393 | .ndo_get_stats64 = ip_tunnel_get_stats64, |
d342894c | 1394 | .ndo_set_rx_mode = vxlan_set_multicast_list, |
1395 | .ndo_change_mtu = eth_change_mtu, | |
1396 | .ndo_validate_addr = eth_validate_addr, | |
1397 | .ndo_set_mac_address = eth_mac_addr, | |
1398 | .ndo_fdb_add = vxlan_fdb_add, | |
1399 | .ndo_fdb_del = vxlan_fdb_delete, | |
1400 | .ndo_fdb_dump = vxlan_fdb_dump, | |
1401 | }; | |
1402 | ||
1403 | /* Info for udev, that this is a virtual tunnel endpoint */ | |
1404 | static struct device_type vxlan_type = { | |
1405 | .name = "vxlan", | |
1406 | }; | |
1407 | ||
d342894c | 1408 | /* Initialize the device structure. */ |
1409 | static void vxlan_setup(struct net_device *dev) | |
1410 | { | |
1411 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
31fec5aa | 1412 | unsigned int h; |
05f47d69 | 1413 | int low, high; |
d342894c | 1414 | |
1415 | eth_hw_addr_random(dev); | |
1416 | ether_setup(dev); | |
2840bf22 | 1417 | dev->hard_header_len = ETH_HLEN + VXLAN_HEADROOM; |
d342894c | 1418 | |
1419 | dev->netdev_ops = &vxlan_netdev_ops; | |
ebf4063e | 1420 | dev->destructor = free_netdev; |
d342894c | 1421 | SET_NETDEV_DEVTYPE(dev, &vxlan_type); |
1422 | ||
1423 | dev->tx_queue_len = 0; | |
1424 | dev->features |= NETIF_F_LLTX; | |
1425 | dev->features |= NETIF_F_NETNS_LOCAL; | |
d6727fe3 | 1426 | dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM; |
0afb1666 | 1427 | dev->features |= NETIF_F_RXCSUM; |
05c0db08 | 1428 | dev->features |= NETIF_F_GSO_SOFTWARE; |
0afb1666 JG |
1429 | |
1430 | dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM; | |
05c0db08 | 1431 | dev->hw_features |= NETIF_F_GSO_SOFTWARE; |
d342894c | 1432 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
6602d007 | 1433 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
d342894c | 1434 | |
553675fb | 1435 | INIT_LIST_HEAD(&vxlan->next); |
d342894c | 1436 | spin_lock_init(&vxlan->hash_lock); |
7c47cedf | 1437 | INIT_WORK(&vxlan->igmp_work, vxlan_igmp_work); |
1c51a915 | 1438 | INIT_WORK(&vxlan->sock_work, vxlan_sock_work); |
d342894c | 1439 | |
1440 | init_timer_deferrable(&vxlan->age_timer); | |
1441 | vxlan->age_timer.function = vxlan_cleanup; | |
1442 | vxlan->age_timer.data = (unsigned long) vxlan; | |
1443 | ||
05f47d69 | 1444 | inet_get_local_port_range(&low, &high); |
1445 | vxlan->port_min = low; | |
1446 | vxlan->port_max = high; | |
823aa873 | 1447 | vxlan->dst_port = htons(vxlan_port); |
05f47d69 | 1448 | |
d342894c | 1449 | vxlan->dev = dev; |
1450 | ||
1451 | for (h = 0; h < FDB_HASH_SIZE; ++h) | |
1452 | INIT_HLIST_HEAD(&vxlan->fdb_head[h]); | |
1453 | } | |
1454 | ||
1455 | static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = { | |
1456 | [IFLA_VXLAN_ID] = { .type = NLA_U32 }, | |
5d174dd8 | 1457 | [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) }, |
d342894c | 1458 | [IFLA_VXLAN_LINK] = { .type = NLA_U32 }, |
1459 | [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) }, | |
1460 | [IFLA_VXLAN_TOS] = { .type = NLA_U8 }, | |
1461 | [IFLA_VXLAN_TTL] = { .type = NLA_U8 }, | |
1462 | [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 }, | |
1463 | [IFLA_VXLAN_AGEING] = { .type = NLA_U32 }, | |
1464 | [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 }, | |
05f47d69 | 1465 | [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) }, |
e4f67add DS |
1466 | [IFLA_VXLAN_PROXY] = { .type = NLA_U8 }, |
1467 | [IFLA_VXLAN_RSC] = { .type = NLA_U8 }, | |
1468 | [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 }, | |
1469 | [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 }, | |
823aa873 | 1470 | [IFLA_VXLAN_PORT] = { .type = NLA_U16 }, |
d342894c | 1471 | }; |
1472 | ||
1473 | static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[]) | |
1474 | { | |
1475 | if (tb[IFLA_ADDRESS]) { | |
1476 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { | |
1477 | pr_debug("invalid link address (not ethernet)\n"); | |
1478 | return -EINVAL; | |
1479 | } | |
1480 | ||
1481 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { | |
1482 | pr_debug("invalid all zero ethernet address\n"); | |
1483 | return -EADDRNOTAVAIL; | |
1484 | } | |
1485 | } | |
1486 | ||
1487 | if (!data) | |
1488 | return -EINVAL; | |
1489 | ||
1490 | if (data[IFLA_VXLAN_ID]) { | |
1491 | __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]); | |
1492 | if (id >= VXLAN_VID_MASK) | |
1493 | return -ERANGE; | |
1494 | } | |
1495 | ||
05f47d69 | 1496 | if (data[IFLA_VXLAN_PORT_RANGE]) { |
1497 | const struct ifla_vxlan_port_range *p | |
1498 | = nla_data(data[IFLA_VXLAN_PORT_RANGE]); | |
1499 | ||
1500 | if (ntohs(p->high) < ntohs(p->low)) { | |
1501 | pr_debug("port range %u .. %u not valid\n", | |
1502 | ntohs(p->low), ntohs(p->high)); | |
1503 | return -EINVAL; | |
1504 | } | |
1505 | } | |
1506 | ||
d342894c | 1507 | return 0; |
1508 | } | |
1509 | ||
1b13c97f YB |
1510 | static void vxlan_get_drvinfo(struct net_device *netdev, |
1511 | struct ethtool_drvinfo *drvinfo) | |
1512 | { | |
1513 | strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version)); | |
1514 | strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver)); | |
1515 | } | |
1516 | ||
1517 | static const struct ethtool_ops vxlan_ethtool_ops = { | |
1518 | .get_drvinfo = vxlan_get_drvinfo, | |
1519 | .get_link = ethtool_op_get_link, | |
1520 | }; | |
1521 | ||
553675fb | 1522 | static void vxlan_del_work(struct work_struct *work) |
1523 | { | |
1524 | struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work); | |
1525 | ||
1526 | sk_release_kernel(vs->sock->sk); | |
1527 | kfree_rcu(vs, rcu); | |
1528 | } | |
1529 | ||
553675fb | 1530 | static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port) |
1531 | { | |
1532 | struct vxlan_sock *vs; | |
1533 | struct sock *sk; | |
1534 | struct sockaddr_in vxlan_addr = { | |
1535 | .sin_family = AF_INET, | |
1536 | .sin_addr.s_addr = htonl(INADDR_ANY), | |
bb3fd687 | 1537 | .sin_port = port, |
553675fb | 1538 | }; |
1539 | int rc; | |
31fec5aa | 1540 | unsigned int h; |
553675fb | 1541 | |
1542 | vs = kmalloc(sizeof(*vs), GFP_KERNEL); | |
1543 | if (!vs) | |
1544 | return ERR_PTR(-ENOMEM); | |
1545 | ||
1546 | for (h = 0; h < VNI_HASH_SIZE; ++h) | |
1547 | INIT_HLIST_HEAD(&vs->vni_list[h]); | |
1548 | ||
1549 | INIT_WORK(&vs->del_work, vxlan_del_work); | |
1550 | ||
1551 | /* Create UDP socket for encapsulation receive. */ | |
1552 | rc = sock_create_kern(AF_INET, SOCK_DGRAM, IPPROTO_UDP, &vs->sock); | |
1553 | if (rc < 0) { | |
1554 | pr_debug("UDP socket create failed\n"); | |
1555 | kfree(vs); | |
1556 | return ERR_PTR(rc); | |
1557 | } | |
1558 | ||
1559 | /* Put in proper namespace */ | |
1560 | sk = vs->sock->sk; | |
1561 | sk_change_net(sk, net); | |
1562 | ||
553675fb | 1563 | rc = kernel_bind(vs->sock, (struct sockaddr *) &vxlan_addr, |
1564 | sizeof(vxlan_addr)); | |
1565 | if (rc < 0) { | |
1566 | pr_debug("bind for UDP socket %pI4:%u (%d)\n", | |
1567 | &vxlan_addr.sin_addr, ntohs(vxlan_addr.sin_port), rc); | |
1568 | sk_release_kernel(sk); | |
1569 | kfree(vs); | |
1570 | return ERR_PTR(rc); | |
1571 | } | |
1572 | ||
1573 | /* Disable multicast loopback */ | |
1574 | inet_sk(sk)->mc_loop = 0; | |
1575 | ||
1576 | /* Mark socket as an encapsulation socket. */ | |
1577 | udp_sk(sk)->encap_type = 1; | |
1578 | udp_sk(sk)->encap_rcv = vxlan_udp_encap_recv; | |
1579 | udp_encap_enable(); | |
7c47cedf | 1580 | atomic_set(&vs->refcnt, 1); |
553675fb | 1581 | |
553675fb | 1582 | return vs; |
1583 | } | |
1584 | ||
1c51a915 SH |
1585 | /* Scheduled at device creation to bind to a socket */ |
1586 | static void vxlan_sock_work(struct work_struct *work) | |
1587 | { | |
1588 | struct vxlan_dev *vxlan | |
1589 | = container_of(work, struct vxlan_dev, sock_work); | |
1590 | struct net_device *dev = vxlan->dev; | |
1591 | struct net *net = dev_net(dev); | |
1592 | __u32 vni = vxlan->default_dst.remote_vni; | |
1593 | __be16 port = vxlan->dst_port; | |
1594 | struct vxlan_net *vn = net_generic(net, vxlan_net_id); | |
1595 | struct vxlan_sock *nvs, *ovs; | |
1596 | ||
1597 | nvs = vxlan_socket_create(net, port); | |
1598 | if (IS_ERR(nvs)) { | |
1599 | netdev_err(vxlan->dev, "Can not create UDP socket, %ld\n", | |
1600 | PTR_ERR(nvs)); | |
1601 | goto out; | |
1602 | } | |
1603 | ||
1604 | spin_lock(&vn->sock_lock); | |
1605 | /* Look again to see if can reuse socket */ | |
1606 | ovs = vxlan_find_port(net, port); | |
1607 | if (ovs) { | |
1608 | atomic_inc(&ovs->refcnt); | |
1609 | vxlan->vn_sock = ovs; | |
1610 | hlist_add_head_rcu(&vxlan->hlist, vni_head(ovs, vni)); | |
1611 | spin_unlock(&vn->sock_lock); | |
1612 | ||
1613 | sk_release_kernel(nvs->sock->sk); | |
1614 | kfree(nvs); | |
1615 | } else { | |
1616 | vxlan->vn_sock = nvs; | |
1617 | hlist_add_head_rcu(&nvs->hlist, vs_head(net, port)); | |
1618 | hlist_add_head_rcu(&vxlan->hlist, vni_head(nvs, vni)); | |
1619 | spin_unlock(&vn->sock_lock); | |
1620 | } | |
1621 | out: | |
1622 | dev_put(dev); | |
1623 | } | |
1624 | ||
d342894c | 1625 | static int vxlan_newlink(struct net *net, struct net_device *dev, |
1626 | struct nlattr *tb[], struct nlattr *data[]) | |
1627 | { | |
553675fb | 1628 | struct vxlan_net *vn = net_generic(net, vxlan_net_id); |
d342894c | 1629 | struct vxlan_dev *vxlan = netdev_priv(dev); |
c7995c43 | 1630 | struct vxlan_rdst *dst = &vxlan->default_dst; |
d342894c | 1631 | __u32 vni; |
1632 | int err; | |
1633 | ||
1634 | if (!data[IFLA_VXLAN_ID]) | |
1635 | return -EINVAL; | |
1636 | ||
1637 | vni = nla_get_u32(data[IFLA_VXLAN_ID]); | |
c7995c43 | 1638 | dst->remote_vni = vni; |
d342894c | 1639 | |
5d174dd8 | 1640 | if (data[IFLA_VXLAN_GROUP]) |
1641 | dst->remote_ip = nla_get_be32(data[IFLA_VXLAN_GROUP]); | |
d342894c | 1642 | |
1643 | if (data[IFLA_VXLAN_LOCAL]) | |
1644 | vxlan->saddr = nla_get_be32(data[IFLA_VXLAN_LOCAL]); | |
1645 | ||
34e02aa1 | 1646 | if (data[IFLA_VXLAN_LINK] && |
c7995c43 | 1647 | (dst->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]))) { |
34e02aa1 | 1648 | struct net_device *lowerdev |
c7995c43 | 1649 | = __dev_get_by_index(net, dst->remote_ifindex); |
34e02aa1 | 1650 | |
1651 | if (!lowerdev) { | |
c7995c43 | 1652 | pr_info("ifindex %d does not exist\n", dst->remote_ifindex); |
34e02aa1 | 1653 | return -ENODEV; |
1654 | } | |
d342894c | 1655 | |
34e02aa1 | 1656 | if (!tb[IFLA_MTU]) |
d342894c | 1657 | dev->mtu = lowerdev->mtu - VXLAN_HEADROOM; |
1ba56fb4 AD |
1658 | |
1659 | /* update header length based on lower device */ | |
1660 | dev->hard_header_len = lowerdev->hard_header_len + | |
1661 | VXLAN_HEADROOM; | |
d342894c | 1662 | } |
1663 | ||
1664 | if (data[IFLA_VXLAN_TOS]) | |
1665 | vxlan->tos = nla_get_u8(data[IFLA_VXLAN_TOS]); | |
1666 | ||
afb97186 VB |
1667 | if (data[IFLA_VXLAN_TTL]) |
1668 | vxlan->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]); | |
1669 | ||
d342894c | 1670 | if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING])) |
e4f67add | 1671 | vxlan->flags |= VXLAN_F_LEARN; |
d342894c | 1672 | |
1673 | if (data[IFLA_VXLAN_AGEING]) | |
1674 | vxlan->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]); | |
1675 | else | |
1676 | vxlan->age_interval = FDB_AGE_DEFAULT; | |
1677 | ||
e4f67add DS |
1678 | if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY])) |
1679 | vxlan->flags |= VXLAN_F_PROXY; | |
1680 | ||
1681 | if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC])) | |
1682 | vxlan->flags |= VXLAN_F_RSC; | |
1683 | ||
1684 | if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS])) | |
1685 | vxlan->flags |= VXLAN_F_L2MISS; | |
1686 | ||
1687 | if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS])) | |
1688 | vxlan->flags |= VXLAN_F_L3MISS; | |
1689 | ||
d342894c | 1690 | if (data[IFLA_VXLAN_LIMIT]) |
1691 | vxlan->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]); | |
1692 | ||
05f47d69 | 1693 | if (data[IFLA_VXLAN_PORT_RANGE]) { |
1694 | const struct ifla_vxlan_port_range *p | |
1695 | = nla_data(data[IFLA_VXLAN_PORT_RANGE]); | |
1696 | vxlan->port_min = ntohs(p->low); | |
1697 | vxlan->port_max = ntohs(p->high); | |
1698 | } | |
1699 | ||
823aa873 | 1700 | if (data[IFLA_VXLAN_PORT]) |
1701 | vxlan->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]); | |
1702 | ||
553675fb | 1703 | if (vxlan_find_vni(net, vni, vxlan->dst_port)) { |
1704 | pr_info("duplicate VNI %u\n", vni); | |
1705 | return -EEXIST; | |
1706 | } | |
1707 | ||
1b13c97f YB |
1708 | SET_ETHTOOL_OPS(dev, &vxlan_ethtool_ops); |
1709 | ||
afbd8bae MR |
1710 | /* create an fdb entry for default destination */ |
1711 | err = vxlan_fdb_create(vxlan, all_zeros_mac, | |
1712 | vxlan->default_dst.remote_ip, | |
1713 | NUD_REACHABLE|NUD_PERMANENT, | |
1714 | NLM_F_EXCL|NLM_F_CREATE, | |
1715 | vxlan->dst_port, vxlan->default_dst.remote_vni, | |
1716 | vxlan->default_dst.remote_ifindex, NTF_SELF); | |
1c51a915 | 1717 | if (err) |
553675fb | 1718 | return err; |
d342894c | 1719 | |
afbd8bae MR |
1720 | err = register_netdevice(dev); |
1721 | if (err) { | |
1722 | vxlan_fdb_delete_defualt(vxlan); | |
1723 | return err; | |
1724 | } | |
1725 | ||
553675fb | 1726 | list_add(&vxlan->next, &vn->vxlan_list); |
553675fb | 1727 | |
1728 | return 0; | |
d342894c | 1729 | } |
1730 | ||
1731 | static void vxlan_dellink(struct net_device *dev, struct list_head *head) | |
1732 | { | |
1733 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1734 | ||
1735 | hlist_del_rcu(&vxlan->hlist); | |
553675fb | 1736 | list_del(&vxlan->next); |
d342894c | 1737 | unregister_netdevice_queue(dev, head); |
1738 | } | |
1739 | ||
1740 | static size_t vxlan_get_size(const struct net_device *dev) | |
1741 | { | |
1742 | ||
1743 | return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */ | |
5d174dd8 | 1744 | nla_total_size(sizeof(__be32)) +/* IFLA_VXLAN_GROUP */ |
d342894c | 1745 | nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */ |
1746 | nla_total_size(sizeof(__be32))+ /* IFLA_VXLAN_LOCAL */ | |
1747 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */ | |
1748 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */ | |
1749 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */ | |
e4f67add DS |
1750 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */ |
1751 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */ | |
1752 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */ | |
1753 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */ | |
d342894c | 1754 | nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */ |
1755 | nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */ | |
05f47d69 | 1756 | nla_total_size(sizeof(struct ifla_vxlan_port_range)) + |
823aa873 | 1757 | nla_total_size(sizeof(__be16))+ /* IFLA_VXLAN_PORT */ |
d342894c | 1758 | 0; |
1759 | } | |
1760 | ||
1761 | static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
1762 | { | |
1763 | const struct vxlan_dev *vxlan = netdev_priv(dev); | |
c7995c43 | 1764 | const struct vxlan_rdst *dst = &vxlan->default_dst; |
05f47d69 | 1765 | struct ifla_vxlan_port_range ports = { |
1766 | .low = htons(vxlan->port_min), | |
1767 | .high = htons(vxlan->port_max), | |
1768 | }; | |
d342894c | 1769 | |
c7995c43 | 1770 | if (nla_put_u32(skb, IFLA_VXLAN_ID, dst->remote_vni)) |
d342894c | 1771 | goto nla_put_failure; |
1772 | ||
5d174dd8 | 1773 | if (dst->remote_ip && nla_put_be32(skb, IFLA_VXLAN_GROUP, dst->remote_ip)) |
d342894c | 1774 | goto nla_put_failure; |
1775 | ||
c7995c43 | 1776 | if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex)) |
d342894c | 1777 | goto nla_put_failure; |
1778 | ||
7c41c42c | 1779 | if (vxlan->saddr && nla_put_be32(skb, IFLA_VXLAN_LOCAL, vxlan->saddr)) |
d342894c | 1780 | goto nla_put_failure; |
1781 | ||
1782 | if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->ttl) || | |
1783 | nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->tos) || | |
e4f67add DS |
1784 | nla_put_u8(skb, IFLA_VXLAN_LEARNING, |
1785 | !!(vxlan->flags & VXLAN_F_LEARN)) || | |
1786 | nla_put_u8(skb, IFLA_VXLAN_PROXY, | |
1787 | !!(vxlan->flags & VXLAN_F_PROXY)) || | |
1788 | nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) || | |
1789 | nla_put_u8(skb, IFLA_VXLAN_L2MISS, | |
1790 | !!(vxlan->flags & VXLAN_F_L2MISS)) || | |
1791 | nla_put_u8(skb, IFLA_VXLAN_L3MISS, | |
1792 | !!(vxlan->flags & VXLAN_F_L3MISS)) || | |
d342894c | 1793 | nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->age_interval) || |
823aa873 | 1794 | nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->addrmax) || |
1795 | nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->dst_port)) | |
d342894c | 1796 | goto nla_put_failure; |
1797 | ||
05f47d69 | 1798 | if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports)) |
1799 | goto nla_put_failure; | |
1800 | ||
d342894c | 1801 | return 0; |
1802 | ||
1803 | nla_put_failure: | |
1804 | return -EMSGSIZE; | |
1805 | } | |
1806 | ||
1807 | static struct rtnl_link_ops vxlan_link_ops __read_mostly = { | |
1808 | .kind = "vxlan", | |
1809 | .maxtype = IFLA_VXLAN_MAX, | |
1810 | .policy = vxlan_policy, | |
1811 | .priv_size = sizeof(struct vxlan_dev), | |
1812 | .setup = vxlan_setup, | |
1813 | .validate = vxlan_validate, | |
1814 | .newlink = vxlan_newlink, | |
1815 | .dellink = vxlan_dellink, | |
1816 | .get_size = vxlan_get_size, | |
1817 | .fill_info = vxlan_fill_info, | |
1818 | }; | |
1819 | ||
1820 | static __net_init int vxlan_init_net(struct net *net) | |
1821 | { | |
1822 | struct vxlan_net *vn = net_generic(net, vxlan_net_id); | |
31fec5aa | 1823 | unsigned int h; |
d342894c | 1824 | |
553675fb | 1825 | INIT_LIST_HEAD(&vn->vxlan_list); |
1c51a915 | 1826 | spin_lock_init(&vn->sock_lock); |
d342894c | 1827 | |
553675fb | 1828 | for (h = 0; h < PORT_HASH_SIZE; ++h) |
1829 | INIT_HLIST_HEAD(&vn->sock_list[h]); | |
d342894c | 1830 | |
1831 | return 0; | |
1832 | } | |
1833 | ||
1834 | static __net_exit void vxlan_exit_net(struct net *net) | |
1835 | { | |
1836 | struct vxlan_net *vn = net_generic(net, vxlan_net_id); | |
9cb6cb7e | 1837 | struct vxlan_dev *vxlan; |
9cb6cb7e ZM |
1838 | |
1839 | rtnl_lock(); | |
553675fb | 1840 | list_for_each_entry(vxlan, &vn->vxlan_list, next) |
1841 | dev_close(vxlan->dev); | |
9cb6cb7e | 1842 | rtnl_unlock(); |
d342894c | 1843 | } |
1844 | ||
1845 | static struct pernet_operations vxlan_net_ops = { | |
1846 | .init = vxlan_init_net, | |
1847 | .exit = vxlan_exit_net, | |
1848 | .id = &vxlan_net_id, | |
1849 | .size = sizeof(struct vxlan_net), | |
1850 | }; | |
1851 | ||
1852 | static int __init vxlan_init_module(void) | |
1853 | { | |
1854 | int rc; | |
1855 | ||
758c57d1 SH |
1856 | vxlan_wq = alloc_workqueue("vxlan", 0, 0); |
1857 | if (!vxlan_wq) | |
1858 | return -ENOMEM; | |
1859 | ||
d342894c | 1860 | get_random_bytes(&vxlan_salt, sizeof(vxlan_salt)); |
1861 | ||
1862 | rc = register_pernet_device(&vxlan_net_ops); | |
1863 | if (rc) | |
1864 | goto out1; | |
1865 | ||
1866 | rc = rtnl_link_register(&vxlan_link_ops); | |
1867 | if (rc) | |
1868 | goto out2; | |
1869 | ||
1870 | return 0; | |
1871 | ||
1872 | out2: | |
1873 | unregister_pernet_device(&vxlan_net_ops); | |
1874 | out1: | |
758c57d1 | 1875 | destroy_workqueue(vxlan_wq); |
d342894c | 1876 | return rc; |
1877 | } | |
7332a13b | 1878 | late_initcall(vxlan_init_module); |
d342894c | 1879 | |
1880 | static void __exit vxlan_cleanup_module(void) | |
1881 | { | |
d342894c | 1882 | unregister_pernet_device(&vxlan_net_ops); |
b7153984 | 1883 | rtnl_link_unregister(&vxlan_link_ops); |
758c57d1 | 1884 | destroy_workqueue(vxlan_wq); |
6681712d | 1885 | rcu_barrier(); |
d342894c | 1886 | } |
1887 | module_exit(vxlan_cleanup_module); | |
1888 | ||
1889 | MODULE_LICENSE("GPL"); | |
1890 | MODULE_VERSION(VXLAN_VERSION); | |
3b8df3c6 | 1891 | MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>"); |
d342894c | 1892 | MODULE_ALIAS_RTNL_LINK("vxlan"); |