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 | ||
47 | #define VNI_HASH_BITS 10 | |
48 | #define VNI_HASH_SIZE (1<<VNI_HASH_BITS) | |
49 | #define FDB_HASH_BITS 8 | |
50 | #define FDB_HASH_SIZE (1<<FDB_HASH_BITS) | |
51 | #define FDB_AGE_DEFAULT 300 /* 5 min */ | |
52 | #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */ | |
53 | ||
54 | #define VXLAN_N_VID (1u << 24) | |
55 | #define VXLAN_VID_MASK (VXLAN_N_VID - 1) | |
52b702ff AD |
56 | /* IP header + UDP + VXLAN + Ethernet header */ |
57 | #define VXLAN_HEADROOM (20 + 8 + 8 + 14) | |
d342894c | 58 | |
59 | #define VXLAN_FLAGS 0x08000000 /* struct vxlanhdr.vx_flags required value. */ | |
60 | ||
61 | /* VXLAN protocol header */ | |
62 | struct vxlanhdr { | |
63 | __be32 vx_flags; | |
64 | __be32 vx_vni; | |
65 | }; | |
66 | ||
23c578bf | 67 | /* UDP port for VXLAN traffic. |
68 | * The IANA assigned port is 4789, but the Linux default is 8472 | |
69 | * for compatability with early adopters. | |
70 | */ | |
d342894c | 71 | static unsigned int vxlan_port __read_mostly = 8472; |
72 | module_param_named(udp_port, vxlan_port, uint, 0444); | |
73 | MODULE_PARM_DESC(udp_port, "Destination UDP port"); | |
74 | ||
75 | static bool log_ecn_error = true; | |
76 | module_param(log_ecn_error, bool, 0644); | |
77 | MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); | |
78 | ||
79 | /* per-net private data for this module */ | |
80 | static unsigned int vxlan_net_id; | |
81 | struct vxlan_net { | |
82 | struct socket *sock; /* UDP encap socket */ | |
83 | struct hlist_head vni_list[VNI_HASH_SIZE]; | |
84 | }; | |
85 | ||
6681712d DS |
86 | struct vxlan_rdst { |
87 | struct rcu_head rcu; | |
88 | __be32 remote_ip; | |
89 | __be16 remote_port; | |
90 | u32 remote_vni; | |
91 | u32 remote_ifindex; | |
92 | struct vxlan_rdst *remote_next; | |
93 | }; | |
94 | ||
d342894c | 95 | /* Forwarding table entry */ |
96 | struct vxlan_fdb { | |
97 | struct hlist_node hlist; /* linked list of entries */ | |
98 | struct rcu_head rcu; | |
99 | unsigned long updated; /* jiffies */ | |
100 | unsigned long used; | |
6681712d | 101 | struct vxlan_rdst remote; |
d342894c | 102 | u16 state; /* see ndm_state */ |
ae884082 | 103 | u8 flags; /* see ndm_flags */ |
d342894c | 104 | u8 eth_addr[ETH_ALEN]; |
105 | }; | |
106 | ||
d342894c | 107 | /* Pseudo network device */ |
108 | struct vxlan_dev { | |
109 | struct hlist_node hlist; | |
110 | struct net_device *dev; | |
c7995c43 | 111 | struct vxlan_rdst default_dst; /* default destination */ |
d342894c | 112 | __be32 saddr; /* source address */ |
823aa873 | 113 | __be16 dst_port; |
05f47d69 | 114 | __u16 port_min; /* source port range */ |
115 | __u16 port_max; | |
d342894c | 116 | __u8 tos; /* TOS override */ |
117 | __u8 ttl; | |
e4f67add | 118 | u32 flags; /* VXLAN_F_* below */ |
d342894c | 119 | |
120 | unsigned long age_interval; | |
121 | struct timer_list age_timer; | |
122 | spinlock_t hash_lock; | |
123 | unsigned int addrcnt; | |
124 | unsigned int addrmax; | |
d342894c | 125 | |
126 | struct hlist_head fdb_head[FDB_HASH_SIZE]; | |
127 | }; | |
128 | ||
e4f67add DS |
129 | #define VXLAN_F_LEARN 0x01 |
130 | #define VXLAN_F_PROXY 0x02 | |
131 | #define VXLAN_F_RSC 0x04 | |
132 | #define VXLAN_F_L2MISS 0x08 | |
133 | #define VXLAN_F_L3MISS 0x10 | |
134 | ||
d342894c | 135 | /* salt for hash table */ |
136 | static u32 vxlan_salt __read_mostly; | |
137 | ||
138 | static inline struct hlist_head *vni_head(struct net *net, u32 id) | |
139 | { | |
140 | struct vxlan_net *vn = net_generic(net, vxlan_net_id); | |
141 | ||
142 | return &vn->vni_list[hash_32(id, VNI_HASH_BITS)]; | |
143 | } | |
144 | ||
145 | /* Look up VNI in a per net namespace table */ | |
146 | static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id) | |
147 | { | |
148 | struct vxlan_dev *vxlan; | |
d342894c | 149 | |
b67bfe0d | 150 | hlist_for_each_entry_rcu(vxlan, vni_head(net, id), hlist) { |
c7995c43 | 151 | if (vxlan->default_dst.remote_vni == id) |
d342894c | 152 | return vxlan; |
153 | } | |
154 | ||
155 | return NULL; | |
156 | } | |
157 | ||
158 | /* Fill in neighbour message in skbuff. */ | |
159 | static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan, | |
160 | const struct vxlan_fdb *fdb, | |
6681712d DS |
161 | u32 portid, u32 seq, int type, unsigned int flags, |
162 | const struct vxlan_rdst *rdst) | |
d342894c | 163 | { |
164 | unsigned long now = jiffies; | |
165 | struct nda_cacheinfo ci; | |
166 | struct nlmsghdr *nlh; | |
167 | struct ndmsg *ndm; | |
e4f67add | 168 | bool send_ip, send_eth; |
d342894c | 169 | |
170 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags); | |
171 | if (nlh == NULL) | |
172 | return -EMSGSIZE; | |
173 | ||
174 | ndm = nlmsg_data(nlh); | |
175 | memset(ndm, 0, sizeof(*ndm)); | |
e4f67add DS |
176 | |
177 | send_eth = send_ip = true; | |
178 | ||
179 | if (type == RTM_GETNEIGH) { | |
180 | ndm->ndm_family = AF_INET; | |
6681712d | 181 | send_ip = rdst->remote_ip != htonl(INADDR_ANY); |
e4f67add DS |
182 | send_eth = !is_zero_ether_addr(fdb->eth_addr); |
183 | } else | |
184 | ndm->ndm_family = AF_BRIDGE; | |
d342894c | 185 | ndm->ndm_state = fdb->state; |
186 | ndm->ndm_ifindex = vxlan->dev->ifindex; | |
ae884082 | 187 | ndm->ndm_flags = fdb->flags; |
d342894c | 188 | ndm->ndm_type = NDA_DST; |
189 | ||
e4f67add | 190 | if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr)) |
d342894c | 191 | goto nla_put_failure; |
192 | ||
6681712d DS |
193 | if (send_ip && nla_put_be32(skb, NDA_DST, rdst->remote_ip)) |
194 | goto nla_put_failure; | |
195 | ||
823aa873 | 196 | if (rdst->remote_port && rdst->remote_port != vxlan->dst_port && |
6681712d DS |
197 | nla_put_be16(skb, NDA_PORT, rdst->remote_port)) |
198 | goto nla_put_failure; | |
c7995c43 | 199 | if (rdst->remote_vni != vxlan->default_dst.remote_vni && |
6681712d DS |
200 | nla_put_be32(skb, NDA_VNI, rdst->remote_vni)) |
201 | goto nla_put_failure; | |
202 | if (rdst->remote_ifindex && | |
203 | nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex)) | |
d342894c | 204 | goto nla_put_failure; |
205 | ||
206 | ci.ndm_used = jiffies_to_clock_t(now - fdb->used); | |
207 | ci.ndm_confirmed = 0; | |
208 | ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated); | |
209 | ci.ndm_refcnt = 0; | |
210 | ||
211 | if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci)) | |
212 | goto nla_put_failure; | |
213 | ||
214 | return nlmsg_end(skb, nlh); | |
215 | ||
216 | nla_put_failure: | |
217 | nlmsg_cancel(skb, nlh); | |
218 | return -EMSGSIZE; | |
219 | } | |
220 | ||
221 | static inline size_t vxlan_nlmsg_size(void) | |
222 | { | |
223 | return NLMSG_ALIGN(sizeof(struct ndmsg)) | |
224 | + nla_total_size(ETH_ALEN) /* NDA_LLADDR */ | |
225 | + nla_total_size(sizeof(__be32)) /* NDA_DST */ | |
73cf3317 | 226 | + nla_total_size(sizeof(__be16)) /* NDA_PORT */ |
6681712d DS |
227 | + nla_total_size(sizeof(__be32)) /* NDA_VNI */ |
228 | + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */ | |
d342894c | 229 | + nla_total_size(sizeof(struct nda_cacheinfo)); |
230 | } | |
231 | ||
232 | static void vxlan_fdb_notify(struct vxlan_dev *vxlan, | |
233 | const struct vxlan_fdb *fdb, int type) | |
234 | { | |
235 | struct net *net = dev_net(vxlan->dev); | |
236 | struct sk_buff *skb; | |
237 | int err = -ENOBUFS; | |
238 | ||
239 | skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC); | |
240 | if (skb == NULL) | |
241 | goto errout; | |
242 | ||
6681712d | 243 | err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, &fdb->remote); |
d342894c | 244 | if (err < 0) { |
245 | /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */ | |
246 | WARN_ON(err == -EMSGSIZE); | |
247 | kfree_skb(skb); | |
248 | goto errout; | |
249 | } | |
250 | ||
251 | rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); | |
252 | return; | |
253 | errout: | |
254 | if (err < 0) | |
255 | rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); | |
256 | } | |
257 | ||
e4f67add DS |
258 | static void vxlan_ip_miss(struct net_device *dev, __be32 ipa) |
259 | { | |
260 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
261 | struct vxlan_fdb f; | |
262 | ||
263 | memset(&f, 0, sizeof f); | |
264 | f.state = NUD_STALE; | |
6681712d DS |
265 | f.remote.remote_ip = ipa; /* goes to NDA_DST */ |
266 | f.remote.remote_vni = VXLAN_N_VID; | |
e4f67add DS |
267 | |
268 | vxlan_fdb_notify(vxlan, &f, RTM_GETNEIGH); | |
269 | } | |
270 | ||
271 | static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN]) | |
272 | { | |
273 | struct vxlan_fdb f; | |
274 | ||
275 | memset(&f, 0, sizeof f); | |
276 | f.state = NUD_STALE; | |
277 | memcpy(f.eth_addr, eth_addr, ETH_ALEN); | |
278 | ||
279 | vxlan_fdb_notify(vxlan, &f, RTM_GETNEIGH); | |
280 | } | |
281 | ||
d342894c | 282 | /* Hash Ethernet address */ |
283 | static u32 eth_hash(const unsigned char *addr) | |
284 | { | |
285 | u64 value = get_unaligned((u64 *)addr); | |
286 | ||
287 | /* only want 6 bytes */ | |
288 | #ifdef __BIG_ENDIAN | |
d342894c | 289 | value >>= 16; |
321fb991 | 290 | #else |
291 | value <<= 16; | |
d342894c | 292 | #endif |
293 | return hash_64(value, FDB_HASH_BITS); | |
294 | } | |
295 | ||
296 | /* Hash chain to use given mac address */ | |
297 | static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan, | |
298 | const u8 *mac) | |
299 | { | |
300 | return &vxlan->fdb_head[eth_hash(mac)]; | |
301 | } | |
302 | ||
303 | /* Look up Ethernet address in forwarding table */ | |
304 | static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan, | |
305 | const u8 *mac) | |
306 | ||
307 | { | |
308 | struct hlist_head *head = vxlan_fdb_head(vxlan, mac); | |
309 | struct vxlan_fdb *f; | |
d342894c | 310 | |
b67bfe0d | 311 | hlist_for_each_entry_rcu(f, head, hlist) { |
d342894c | 312 | if (compare_ether_addr(mac, f->eth_addr) == 0) |
313 | return f; | |
314 | } | |
315 | ||
316 | return NULL; | |
317 | } | |
318 | ||
6681712d DS |
319 | /* Add/update destinations for multicast */ |
320 | static int vxlan_fdb_append(struct vxlan_fdb *f, | |
73cf3317 | 321 | __be32 ip, __be16 port, __u32 vni, __u32 ifindex) |
6681712d DS |
322 | { |
323 | struct vxlan_rdst *rd_prev, *rd; | |
324 | ||
325 | rd_prev = NULL; | |
326 | for (rd = &f->remote; rd; rd = rd->remote_next) { | |
327 | if (rd->remote_ip == ip && | |
328 | rd->remote_port == port && | |
329 | rd->remote_vni == vni && | |
330 | rd->remote_ifindex == ifindex) | |
331 | return 0; | |
332 | rd_prev = rd; | |
333 | } | |
334 | rd = kmalloc(sizeof(*rd), GFP_ATOMIC); | |
335 | if (rd == NULL) | |
336 | return -ENOBUFS; | |
337 | rd->remote_ip = ip; | |
338 | rd->remote_port = port; | |
339 | rd->remote_vni = vni; | |
340 | rd->remote_ifindex = ifindex; | |
341 | rd->remote_next = NULL; | |
342 | rd_prev->remote_next = rd; | |
343 | return 1; | |
344 | } | |
345 | ||
d342894c | 346 | /* Add new entry to forwarding table -- assumes lock held */ |
347 | static int vxlan_fdb_create(struct vxlan_dev *vxlan, | |
348 | const u8 *mac, __be32 ip, | |
6681712d | 349 | __u16 state, __u16 flags, |
73cf3317 | 350 | __be16 port, __u32 vni, __u32 ifindex, |
ae884082 | 351 | __u8 ndm_flags) |
d342894c | 352 | { |
353 | struct vxlan_fdb *f; | |
354 | int notify = 0; | |
355 | ||
356 | f = vxlan_find_mac(vxlan, mac); | |
357 | if (f) { | |
358 | if (flags & NLM_F_EXCL) { | |
359 | netdev_dbg(vxlan->dev, | |
360 | "lost race to create %pM\n", mac); | |
361 | return -EEXIST; | |
362 | } | |
363 | if (f->state != state) { | |
364 | f->state = state; | |
365 | f->updated = jiffies; | |
366 | notify = 1; | |
367 | } | |
ae884082 DS |
368 | if (f->flags != ndm_flags) { |
369 | f->flags = ndm_flags; | |
370 | f->updated = jiffies; | |
371 | notify = 1; | |
372 | } | |
6681712d DS |
373 | if ((flags & NLM_F_APPEND) && |
374 | is_multicast_ether_addr(f->eth_addr)) { | |
375 | int rc = vxlan_fdb_append(f, ip, port, vni, ifindex); | |
376 | ||
377 | if (rc < 0) | |
378 | return rc; | |
379 | notify |= rc; | |
380 | } | |
d342894c | 381 | } else { |
382 | if (!(flags & NLM_F_CREATE)) | |
383 | return -ENOENT; | |
384 | ||
385 | if (vxlan->addrmax && vxlan->addrcnt >= vxlan->addrmax) | |
386 | return -ENOSPC; | |
387 | ||
388 | netdev_dbg(vxlan->dev, "add %pM -> %pI4\n", mac, &ip); | |
389 | f = kmalloc(sizeof(*f), GFP_ATOMIC); | |
390 | if (!f) | |
391 | return -ENOMEM; | |
392 | ||
393 | notify = 1; | |
6681712d DS |
394 | f->remote.remote_ip = ip; |
395 | f->remote.remote_port = port; | |
396 | f->remote.remote_vni = vni; | |
397 | f->remote.remote_ifindex = ifindex; | |
398 | f->remote.remote_next = NULL; | |
d342894c | 399 | f->state = state; |
ae884082 | 400 | f->flags = ndm_flags; |
d342894c | 401 | f->updated = f->used = jiffies; |
402 | memcpy(f->eth_addr, mac, ETH_ALEN); | |
403 | ||
404 | ++vxlan->addrcnt; | |
405 | hlist_add_head_rcu(&f->hlist, | |
406 | vxlan_fdb_head(vxlan, mac)); | |
407 | } | |
408 | ||
409 | if (notify) | |
410 | vxlan_fdb_notify(vxlan, f, RTM_NEWNEIGH); | |
411 | ||
412 | return 0; | |
413 | } | |
414 | ||
6706c82e | 415 | static void vxlan_fdb_free(struct rcu_head *head) |
6681712d DS |
416 | { |
417 | struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu); | |
418 | ||
419 | while (f->remote.remote_next) { | |
420 | struct vxlan_rdst *rd = f->remote.remote_next; | |
421 | ||
422 | f->remote.remote_next = rd->remote_next; | |
423 | kfree(rd); | |
424 | } | |
425 | kfree(f); | |
426 | } | |
427 | ||
d342894c | 428 | static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f) |
429 | { | |
430 | netdev_dbg(vxlan->dev, | |
431 | "delete %pM\n", f->eth_addr); | |
432 | ||
433 | --vxlan->addrcnt; | |
434 | vxlan_fdb_notify(vxlan, f, RTM_DELNEIGH); | |
435 | ||
436 | hlist_del_rcu(&f->hlist); | |
6681712d | 437 | call_rcu(&f->rcu, vxlan_fdb_free); |
d342894c | 438 | } |
439 | ||
440 | /* Add static entry (via netlink) */ | |
441 | static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], | |
442 | struct net_device *dev, | |
443 | const unsigned char *addr, u16 flags) | |
444 | { | |
445 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
6681712d | 446 | struct net *net = dev_net(vxlan->dev); |
d342894c | 447 | __be32 ip; |
73cf3317 | 448 | __be16 port; |
449 | u32 vni, ifindex; | |
d342894c | 450 | int err; |
451 | ||
452 | if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) { | |
453 | pr_info("RTM_NEWNEIGH with invalid state %#x\n", | |
454 | ndm->ndm_state); | |
455 | return -EINVAL; | |
456 | } | |
457 | ||
458 | if (tb[NDA_DST] == NULL) | |
459 | return -EINVAL; | |
460 | ||
461 | if (nla_len(tb[NDA_DST]) != sizeof(__be32)) | |
462 | return -EAFNOSUPPORT; | |
463 | ||
464 | ip = nla_get_be32(tb[NDA_DST]); | |
465 | ||
6681712d | 466 | if (tb[NDA_PORT]) { |
73cf3317 | 467 | if (nla_len(tb[NDA_PORT]) != sizeof(__be16)) |
6681712d | 468 | return -EINVAL; |
73cf3317 | 469 | port = nla_get_be16(tb[NDA_PORT]); |
6681712d | 470 | } else |
823aa873 | 471 | port = vxlan->dst_port; |
6681712d DS |
472 | |
473 | if (tb[NDA_VNI]) { | |
474 | if (nla_len(tb[NDA_VNI]) != sizeof(u32)) | |
475 | return -EINVAL; | |
476 | vni = nla_get_u32(tb[NDA_VNI]); | |
477 | } else | |
c7995c43 | 478 | vni = vxlan->default_dst.remote_vni; |
6681712d DS |
479 | |
480 | if (tb[NDA_IFINDEX]) { | |
5abb0029 | 481 | struct net_device *tdev; |
6681712d DS |
482 | |
483 | if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32)) | |
484 | return -EINVAL; | |
485 | ifindex = nla_get_u32(tb[NDA_IFINDEX]); | |
5abb0029 PS |
486 | tdev = dev_get_by_index(net, ifindex); |
487 | if (!tdev) | |
6681712d | 488 | return -EADDRNOTAVAIL; |
5abb0029 | 489 | dev_put(tdev); |
6681712d DS |
490 | } else |
491 | ifindex = 0; | |
492 | ||
d342894c | 493 | spin_lock_bh(&vxlan->hash_lock); |
73cf3317 | 494 | err = vxlan_fdb_create(vxlan, addr, ip, ndm->ndm_state, flags, |
495 | port, vni, ifindex, ndm->ndm_flags); | |
d342894c | 496 | spin_unlock_bh(&vxlan->hash_lock); |
497 | ||
498 | return err; | |
499 | } | |
500 | ||
501 | /* Delete entry (via netlink) */ | |
1690be63 VY |
502 | static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[], |
503 | struct net_device *dev, | |
d342894c | 504 | const unsigned char *addr) |
505 | { | |
506 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
507 | struct vxlan_fdb *f; | |
508 | int err = -ENOENT; | |
509 | ||
510 | spin_lock_bh(&vxlan->hash_lock); | |
511 | f = vxlan_find_mac(vxlan, addr); | |
512 | if (f) { | |
513 | vxlan_fdb_destroy(vxlan, f); | |
514 | err = 0; | |
515 | } | |
516 | spin_unlock_bh(&vxlan->hash_lock); | |
517 | ||
518 | return err; | |
519 | } | |
520 | ||
521 | /* Dump forwarding table */ | |
522 | static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb, | |
523 | struct net_device *dev, int idx) | |
524 | { | |
525 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
526 | unsigned int h; | |
527 | ||
528 | for (h = 0; h < FDB_HASH_SIZE; ++h) { | |
529 | struct vxlan_fdb *f; | |
d342894c | 530 | int err; |
531 | ||
b67bfe0d | 532 | hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) { |
6681712d DS |
533 | struct vxlan_rdst *rd; |
534 | for (rd = &f->remote; rd; rd = rd->remote_next) { | |
535 | if (idx < cb->args[0]) | |
536 | goto skip; | |
537 | ||
538 | err = vxlan_fdb_info(skb, vxlan, f, | |
539 | NETLINK_CB(cb->skb).portid, | |
540 | cb->nlh->nlmsg_seq, | |
541 | RTM_NEWNEIGH, | |
542 | NLM_F_MULTI, rd); | |
543 | if (err < 0) | |
544 | break; | |
d342894c | 545 | skip: |
6681712d DS |
546 | ++idx; |
547 | } | |
d342894c | 548 | } |
549 | } | |
550 | ||
551 | return idx; | |
552 | } | |
553 | ||
554 | /* Watch incoming packets to learn mapping between Ethernet address | |
555 | * and Tunnel endpoint. | |
556 | */ | |
557 | static void vxlan_snoop(struct net_device *dev, | |
558 | __be32 src_ip, const u8 *src_mac) | |
559 | { | |
560 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
561 | struct vxlan_fdb *f; | |
562 | int err; | |
563 | ||
564 | f = vxlan_find_mac(vxlan, src_mac); | |
565 | if (likely(f)) { | |
566 | f->used = jiffies; | |
6681712d | 567 | if (likely(f->remote.remote_ip == src_ip)) |
d342894c | 568 | return; |
569 | ||
570 | if (net_ratelimit()) | |
571 | netdev_info(dev, | |
572 | "%pM migrated from %pI4 to %pI4\n", | |
6681712d | 573 | src_mac, &f->remote.remote_ip, &src_ip); |
d342894c | 574 | |
6681712d | 575 | f->remote.remote_ip = src_ip; |
d342894c | 576 | f->updated = jiffies; |
577 | } else { | |
578 | /* learned new entry */ | |
579 | spin_lock(&vxlan->hash_lock); | |
580 | err = vxlan_fdb_create(vxlan, src_mac, src_ip, | |
581 | NUD_REACHABLE, | |
6681712d | 582 | NLM_F_EXCL|NLM_F_CREATE, |
823aa873 | 583 | vxlan->dst_port, |
ae884082 DS |
584 | vxlan->default_dst.remote_vni, |
585 | 0, NTF_SELF); | |
d342894c | 586 | spin_unlock(&vxlan->hash_lock); |
587 | } | |
588 | } | |
589 | ||
590 | ||
591 | /* See if multicast group is already in use by other ID */ | |
592 | static bool vxlan_group_used(struct vxlan_net *vn, | |
593 | const struct vxlan_dev *this) | |
594 | { | |
595 | const struct vxlan_dev *vxlan; | |
d342894c | 596 | unsigned h; |
597 | ||
598 | for (h = 0; h < VNI_HASH_SIZE; ++h) | |
b67bfe0d | 599 | hlist_for_each_entry(vxlan, &vn->vni_list[h], hlist) { |
d342894c | 600 | if (vxlan == this) |
601 | continue; | |
602 | ||
603 | if (!netif_running(vxlan->dev)) | |
604 | continue; | |
605 | ||
c7995c43 | 606 | if (vxlan->default_dst.remote_ip == this->default_dst.remote_ip) |
d342894c | 607 | return true; |
608 | } | |
609 | ||
610 | return false; | |
611 | } | |
612 | ||
613 | /* kernel equivalent to IP_ADD_MEMBERSHIP */ | |
614 | static int vxlan_join_group(struct net_device *dev) | |
615 | { | |
616 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
617 | struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id); | |
618 | struct sock *sk = vn->sock->sk; | |
619 | struct ip_mreqn mreq = { | |
c7995c43 AW |
620 | .imr_multiaddr.s_addr = vxlan->default_dst.remote_ip, |
621 | .imr_ifindex = vxlan->default_dst.remote_ifindex, | |
d342894c | 622 | }; |
623 | int err; | |
624 | ||
625 | /* Already a member of group */ | |
626 | if (vxlan_group_used(vn, vxlan)) | |
627 | return 0; | |
628 | ||
629 | /* Need to drop RTNL to call multicast join */ | |
630 | rtnl_unlock(); | |
631 | lock_sock(sk); | |
632 | err = ip_mc_join_group(sk, &mreq); | |
633 | release_sock(sk); | |
634 | rtnl_lock(); | |
635 | ||
636 | return err; | |
637 | } | |
638 | ||
639 | ||
640 | /* kernel equivalent to IP_DROP_MEMBERSHIP */ | |
641 | static int vxlan_leave_group(struct net_device *dev) | |
642 | { | |
643 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
644 | struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id); | |
645 | int err = 0; | |
646 | struct sock *sk = vn->sock->sk; | |
647 | struct ip_mreqn mreq = { | |
c7995c43 AW |
648 | .imr_multiaddr.s_addr = vxlan->default_dst.remote_ip, |
649 | .imr_ifindex = vxlan->default_dst.remote_ifindex, | |
d342894c | 650 | }; |
651 | ||
652 | /* Only leave group when last vxlan is done. */ | |
653 | if (vxlan_group_used(vn, vxlan)) | |
654 | return 0; | |
655 | ||
656 | /* Need to drop RTNL to call multicast leave */ | |
657 | rtnl_unlock(); | |
658 | lock_sock(sk); | |
659 | err = ip_mc_leave_group(sk, &mreq); | |
660 | release_sock(sk); | |
661 | rtnl_lock(); | |
662 | ||
663 | return err; | |
664 | } | |
665 | ||
666 | /* Callback from net/ipv4/udp.c to receive packets */ | |
667 | static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb) | |
668 | { | |
669 | struct iphdr *oip; | |
670 | struct vxlanhdr *vxh; | |
671 | struct vxlan_dev *vxlan; | |
e8171045 | 672 | struct pcpu_tstats *stats; |
d342894c | 673 | __u32 vni; |
674 | int err; | |
675 | ||
676 | /* pop off outer UDP header */ | |
677 | __skb_pull(skb, sizeof(struct udphdr)); | |
678 | ||
679 | /* Need Vxlan and inner Ethernet header to be present */ | |
680 | if (!pskb_may_pull(skb, sizeof(struct vxlanhdr))) | |
681 | goto error; | |
682 | ||
683 | /* Drop packets with reserved bits set */ | |
684 | vxh = (struct vxlanhdr *) skb->data; | |
685 | if (vxh->vx_flags != htonl(VXLAN_FLAGS) || | |
686 | (vxh->vx_vni & htonl(0xff))) { | |
687 | netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n", | |
688 | ntohl(vxh->vx_flags), ntohl(vxh->vx_vni)); | |
689 | goto error; | |
690 | } | |
691 | ||
692 | __skb_pull(skb, sizeof(struct vxlanhdr)); | |
d342894c | 693 | |
694 | /* Is this VNI defined? */ | |
695 | vni = ntohl(vxh->vx_vni) >> 8; | |
696 | vxlan = vxlan_find_vni(sock_net(sk), vni); | |
697 | if (!vxlan) { | |
698 | netdev_dbg(skb->dev, "unknown vni %d\n", vni); | |
699 | goto drop; | |
700 | } | |
701 | ||
702 | if (!pskb_may_pull(skb, ETH_HLEN)) { | |
703 | vxlan->dev->stats.rx_length_errors++; | |
704 | vxlan->dev->stats.rx_errors++; | |
705 | goto drop; | |
706 | } | |
707 | ||
e4f67add DS |
708 | skb_reset_mac_header(skb); |
709 | ||
d342894c | 710 | /* Re-examine inner Ethernet packet */ |
711 | oip = ip_hdr(skb); | |
712 | skb->protocol = eth_type_trans(skb, vxlan->dev); | |
d342894c | 713 | |
714 | /* Ignore packet loops (and multicast echo) */ | |
715 | if (compare_ether_addr(eth_hdr(skb)->h_source, | |
716 | vxlan->dev->dev_addr) == 0) | |
717 | goto drop; | |
718 | ||
e4f67add | 719 | if (vxlan->flags & VXLAN_F_LEARN) |
d342894c | 720 | vxlan_snoop(skb->dev, oip->saddr, eth_hdr(skb)->h_source); |
721 | ||
722 | __skb_tunnel_rx(skb, vxlan->dev); | |
723 | skb_reset_network_header(skb); | |
0afb1666 JG |
724 | |
725 | /* If the NIC driver gave us an encapsulated packet with | |
726 | * CHECKSUM_UNNECESSARY and Rx checksum feature is enabled, | |
727 | * leave the CHECKSUM_UNNECESSARY, the device checksummed it | |
728 | * for us. Otherwise force the upper layers to verify it. | |
729 | */ | |
730 | if (skb->ip_summed != CHECKSUM_UNNECESSARY || !skb->encapsulation || | |
731 | !(vxlan->dev->features & NETIF_F_RXCSUM)) | |
732 | skb->ip_summed = CHECKSUM_NONE; | |
733 | ||
734 | skb->encapsulation = 0; | |
d342894c | 735 | |
736 | err = IP_ECN_decapsulate(oip, skb); | |
737 | if (unlikely(err)) { | |
738 | if (log_ecn_error) | |
739 | net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", | |
740 | &oip->saddr, oip->tos); | |
741 | if (err > 1) { | |
742 | ++vxlan->dev->stats.rx_frame_errors; | |
743 | ++vxlan->dev->stats.rx_errors; | |
744 | goto drop; | |
745 | } | |
746 | } | |
747 | ||
e8171045 | 748 | stats = this_cpu_ptr(vxlan->dev->tstats); |
d342894c | 749 | u64_stats_update_begin(&stats->syncp); |
750 | stats->rx_packets++; | |
751 | stats->rx_bytes += skb->len; | |
752 | u64_stats_update_end(&stats->syncp); | |
753 | ||
754 | netif_rx(skb); | |
755 | ||
756 | return 0; | |
757 | error: | |
758 | /* Put UDP header back */ | |
759 | __skb_push(skb, sizeof(struct udphdr)); | |
760 | ||
761 | return 1; | |
762 | drop: | |
763 | /* Consume bad packet */ | |
764 | kfree_skb(skb); | |
765 | return 0; | |
766 | } | |
767 | ||
e4f67add DS |
768 | static int arp_reduce(struct net_device *dev, struct sk_buff *skb) |
769 | { | |
770 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
771 | struct arphdr *parp; | |
772 | u8 *arpptr, *sha; | |
773 | __be32 sip, tip; | |
774 | struct neighbour *n; | |
775 | ||
776 | if (dev->flags & IFF_NOARP) | |
777 | goto out; | |
778 | ||
779 | if (!pskb_may_pull(skb, arp_hdr_len(dev))) { | |
780 | dev->stats.tx_dropped++; | |
781 | goto out; | |
782 | } | |
783 | parp = arp_hdr(skb); | |
784 | ||
785 | if ((parp->ar_hrd != htons(ARPHRD_ETHER) && | |
786 | parp->ar_hrd != htons(ARPHRD_IEEE802)) || | |
787 | parp->ar_pro != htons(ETH_P_IP) || | |
788 | parp->ar_op != htons(ARPOP_REQUEST) || | |
789 | parp->ar_hln != dev->addr_len || | |
790 | parp->ar_pln != 4) | |
791 | goto out; | |
792 | arpptr = (u8 *)parp + sizeof(struct arphdr); | |
793 | sha = arpptr; | |
794 | arpptr += dev->addr_len; /* sha */ | |
795 | memcpy(&sip, arpptr, sizeof(sip)); | |
796 | arpptr += sizeof(sip); | |
797 | arpptr += dev->addr_len; /* tha */ | |
798 | memcpy(&tip, arpptr, sizeof(tip)); | |
799 | ||
800 | if (ipv4_is_loopback(tip) || | |
801 | ipv4_is_multicast(tip)) | |
802 | goto out; | |
803 | ||
804 | n = neigh_lookup(&arp_tbl, &tip, dev); | |
805 | ||
806 | if (n) { | |
e4f67add DS |
807 | struct vxlan_fdb *f; |
808 | struct sk_buff *reply; | |
809 | ||
810 | if (!(n->nud_state & NUD_CONNECTED)) { | |
811 | neigh_release(n); | |
812 | goto out; | |
813 | } | |
814 | ||
815 | f = vxlan_find_mac(vxlan, n->ha); | |
6681712d | 816 | if (f && f->remote.remote_ip == htonl(INADDR_ANY)) { |
e4f67add DS |
817 | /* bridge-local neighbor */ |
818 | neigh_release(n); | |
819 | goto out; | |
820 | } | |
821 | ||
822 | reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha, | |
823 | n->ha, sha); | |
824 | ||
825 | neigh_release(n); | |
826 | ||
827 | skb_reset_mac_header(reply); | |
828 | __skb_pull(reply, skb_network_offset(reply)); | |
829 | reply->ip_summed = CHECKSUM_UNNECESSARY; | |
830 | reply->pkt_type = PACKET_HOST; | |
831 | ||
832 | if (netif_rx_ni(reply) == NET_RX_DROP) | |
833 | dev->stats.rx_dropped++; | |
834 | } else if (vxlan->flags & VXLAN_F_L3MISS) | |
835 | vxlan_ip_miss(dev, tip); | |
836 | out: | |
837 | consume_skb(skb); | |
838 | return NETDEV_TX_OK; | |
839 | } | |
840 | ||
841 | static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb) | |
842 | { | |
843 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
844 | struct neighbour *n; | |
845 | struct iphdr *pip; | |
846 | ||
847 | if (is_multicast_ether_addr(eth_hdr(skb)->h_dest)) | |
848 | return false; | |
849 | ||
850 | n = NULL; | |
851 | switch (ntohs(eth_hdr(skb)->h_proto)) { | |
852 | case ETH_P_IP: | |
853 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
854 | return false; | |
855 | pip = ip_hdr(skb); | |
856 | n = neigh_lookup(&arp_tbl, &pip->daddr, dev); | |
857 | break; | |
858 | default: | |
859 | return false; | |
860 | } | |
861 | ||
862 | if (n) { | |
863 | bool diff; | |
864 | ||
865 | diff = compare_ether_addr(eth_hdr(skb)->h_dest, n->ha) != 0; | |
866 | if (diff) { | |
867 | memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest, | |
868 | dev->addr_len); | |
869 | memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len); | |
870 | } | |
871 | neigh_release(n); | |
872 | return diff; | |
873 | } else if (vxlan->flags & VXLAN_F_L3MISS) | |
874 | vxlan_ip_miss(dev, pip->daddr); | |
875 | return false; | |
876 | } | |
877 | ||
1cad8715 | 878 | static void vxlan_sock_free(struct sk_buff *skb) |
879 | { | |
880 | sock_put(skb->sk); | |
881 | } | |
882 | ||
883 | /* On transmit, associate with the tunnel socket */ | |
884 | static void vxlan_set_owner(struct net_device *dev, struct sk_buff *skb) | |
885 | { | |
886 | struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id); | |
887 | struct sock *sk = vn->sock->sk; | |
888 | ||
889 | skb_orphan(skb); | |
890 | sock_hold(sk); | |
891 | skb->sk = sk; | |
892 | skb->destructor = vxlan_sock_free; | |
893 | } | |
894 | ||
05f47d69 | 895 | /* Compute source port for outgoing packet |
896 | * first choice to use L4 flow hash since it will spread | |
897 | * better and maybe available from hardware | |
898 | * secondary choice is to use jhash on the Ethernet header | |
899 | */ | |
7d836a76 | 900 | static __be16 vxlan_src_port(const struct vxlan_dev *vxlan, struct sk_buff *skb) |
05f47d69 | 901 | { |
902 | unsigned int range = (vxlan->port_max - vxlan->port_min) + 1; | |
903 | u32 hash; | |
904 | ||
905 | hash = skb_get_rxhash(skb); | |
906 | if (!hash) | |
907 | hash = jhash(skb->data, 2 * ETH_ALEN, | |
908 | (__force u32) skb->protocol); | |
909 | ||
7d836a76 | 910 | return htons((((u64) hash * range) >> 32) + vxlan->port_min); |
05f47d69 | 911 | } |
912 | ||
05c0db08 PS |
913 | static int handle_offloads(struct sk_buff *skb) |
914 | { | |
915 | if (skb_is_gso(skb)) { | |
916 | int err = skb_unclone(skb, GFP_ATOMIC); | |
917 | if (unlikely(err)) | |
918 | return err; | |
919 | ||
f6ace502 | 920 | skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_TUNNEL; |
05c0db08 PS |
921 | } else if (skb->ip_summed != CHECKSUM_PARTIAL) |
922 | skb->ip_summed = CHECKSUM_NONE; | |
923 | ||
924 | return 0; | |
925 | } | |
926 | ||
9dcc71e1 SS |
927 | /* Bypass encapsulation if the destination is local */ |
928 | static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan, | |
929 | struct vxlan_dev *dst_vxlan) | |
930 | { | |
931 | struct pcpu_tstats *tx_stats = this_cpu_ptr(src_vxlan->dev->tstats); | |
932 | struct pcpu_tstats *rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats); | |
933 | ||
934 | skb->pkt_type = PACKET_HOST; | |
935 | skb->encapsulation = 0; | |
936 | skb->dev = dst_vxlan->dev; | |
937 | __skb_pull(skb, skb_network_offset(skb)); | |
938 | ||
939 | if (dst_vxlan->flags & VXLAN_F_LEARN) | |
9d9f163c MR |
940 | vxlan_snoop(skb->dev, htonl(INADDR_LOOPBACK), |
941 | eth_hdr(skb)->h_source); | |
9dcc71e1 SS |
942 | |
943 | u64_stats_update_begin(&tx_stats->syncp); | |
944 | tx_stats->tx_packets++; | |
945 | tx_stats->tx_bytes += skb->len; | |
946 | u64_stats_update_end(&tx_stats->syncp); | |
947 | ||
948 | if (netif_rx(skb) == NET_RX_SUCCESS) { | |
949 | u64_stats_update_begin(&rx_stats->syncp); | |
950 | rx_stats->rx_packets++; | |
951 | rx_stats->rx_bytes += skb->len; | |
952 | u64_stats_update_end(&rx_stats->syncp); | |
953 | } else { | |
954 | skb->dev->stats.rx_dropped++; | |
955 | } | |
956 | } | |
957 | ||
6681712d DS |
958 | static netdev_tx_t vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev, |
959 | struct vxlan_rdst *rdst, bool did_rsc) | |
d342894c | 960 | { |
961 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
962 | struct rtable *rt; | |
d342894c | 963 | const struct iphdr *old_iph; |
964 | struct iphdr *iph; | |
965 | struct vxlanhdr *vxh; | |
966 | struct udphdr *uh; | |
967 | struct flowi4 fl4; | |
d342894c | 968 | __be32 dst; |
7d836a76 | 969 | __be16 src_port, dst_port; |
6681712d | 970 | u32 vni; |
d342894c | 971 | __be16 df = 0; |
972 | __u8 tos, ttl; | |
d342894c | 973 | |
823aa873 | 974 | dst_port = rdst->remote_port ? rdst->remote_port : vxlan->dst_port; |
6681712d DS |
975 | vni = rdst->remote_vni; |
976 | dst = rdst->remote_ip; | |
e4f67add DS |
977 | |
978 | if (!dst) { | |
979 | if (did_rsc) { | |
e4f67add | 980 | /* short-circuited back to local bridge */ |
9dcc71e1 | 981 | vxlan_encap_bypass(skb, vxlan, vxlan); |
e4f67add DS |
982 | return NETDEV_TX_OK; |
983 | } | |
ef59febe | 984 | goto drop; |
e4f67add | 985 | } |
ef59febe | 986 | |
d6727fe3 JG |
987 | if (!skb->encapsulation) { |
988 | skb_reset_inner_headers(skb); | |
989 | skb->encapsulation = 1; | |
990 | } | |
991 | ||
d342894c | 992 | /* Need space for new headers (invalidates iph ptr) */ |
993 | if (skb_cow_head(skb, VXLAN_HEADROOM)) | |
994 | goto drop; | |
995 | ||
d342894c | 996 | old_iph = ip_hdr(skb); |
997 | ||
d342894c | 998 | ttl = vxlan->ttl; |
999 | if (!ttl && IN_MULTICAST(ntohl(dst))) | |
1000 | ttl = 1; | |
1001 | ||
1002 | tos = vxlan->tos; | |
1003 | if (tos == 1) | |
206aaafc | 1004 | tos = ip_tunnel_get_dsfield(old_iph, skb); |
d342894c | 1005 | |
05f47d69 | 1006 | src_port = vxlan_src_port(vxlan, skb); |
d342894c | 1007 | |
ca78f181 | 1008 | memset(&fl4, 0, sizeof(fl4)); |
6681712d | 1009 | fl4.flowi4_oif = rdst->remote_ifindex; |
ca78f181 | 1010 | fl4.flowi4_tos = RT_TOS(tos); |
1011 | fl4.daddr = dst; | |
1012 | fl4.saddr = vxlan->saddr; | |
1013 | ||
1014 | rt = ip_route_output_key(dev_net(dev), &fl4); | |
d342894c | 1015 | if (IS_ERR(rt)) { |
1016 | netdev_dbg(dev, "no route to %pI4\n", &dst); | |
1017 | dev->stats.tx_carrier_errors++; | |
1018 | goto tx_error; | |
1019 | } | |
1020 | ||
1021 | if (rt->dst.dev == dev) { | |
1022 | netdev_dbg(dev, "circular route to %pI4\n", &dst); | |
1023 | ip_rt_put(rt); | |
1024 | dev->stats.collisions++; | |
1025 | goto tx_error; | |
1026 | } | |
1027 | ||
9dcc71e1 | 1028 | /* Bypass encapsulation if the destination is local */ |
ab09a6d0 MR |
1029 | if (rt->rt_flags & RTCF_LOCAL && |
1030 | !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) { | |
9dcc71e1 SS |
1031 | struct vxlan_dev *dst_vxlan; |
1032 | ||
1033 | ip_rt_put(rt); | |
1034 | dst_vxlan = vxlan_find_vni(dev_net(dev), vni); | |
1035 | if (!dst_vxlan) | |
1036 | goto tx_error; | |
1037 | vxlan_encap_bypass(skb, vxlan, dst_vxlan); | |
1038 | return NETDEV_TX_OK; | |
1039 | } | |
1040 | ||
d342894c | 1041 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
1042 | IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED | | |
1043 | IPSKB_REROUTED); | |
1044 | skb_dst_drop(skb); | |
1045 | skb_dst_set(skb, &rt->dst); | |
1046 | ||
1047 | vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh)); | |
1048 | vxh->vx_flags = htonl(VXLAN_FLAGS); | |
6681712d | 1049 | vxh->vx_vni = htonl(vni << 8); |
d342894c | 1050 | |
1051 | __skb_push(skb, sizeof(*uh)); | |
1052 | skb_reset_transport_header(skb); | |
1053 | uh = udp_hdr(skb); | |
1054 | ||
73cf3317 | 1055 | uh->dest = dst_port; |
7d836a76 | 1056 | uh->source = src_port; |
d342894c | 1057 | |
1058 | uh->len = htons(skb->len); | |
1059 | uh->check = 0; | |
1060 | ||
1061 | __skb_push(skb, sizeof(*iph)); | |
1062 | skb_reset_network_header(skb); | |
1063 | iph = ip_hdr(skb); | |
1064 | iph->version = 4; | |
1065 | iph->ihl = sizeof(struct iphdr) >> 2; | |
1066 | iph->frag_off = df; | |
1067 | iph->protocol = IPPROTO_UDP; | |
206aaafc | 1068 | iph->tos = ip_tunnel_ecn_encap(tos, old_iph, skb); |
ca78f181 | 1069 | iph->daddr = dst; |
d342894c | 1070 | iph->saddr = fl4.saddr; |
1071 | iph->ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); | |
8dc98eb2 | 1072 | tunnel_ip_select_ident(skb, old_iph, &rt->dst); |
d342894c | 1073 | |
88c4c066 ZM |
1074 | nf_reset(skb); |
1075 | ||
1cad8715 | 1076 | vxlan_set_owner(dev, skb); |
1077 | ||
05c0db08 PS |
1078 | if (handle_offloads(skb)) |
1079 | goto drop; | |
d342894c | 1080 | |
6aed0c8b | 1081 | iptunnel_xmit(skb, dev); |
d342894c | 1082 | return NETDEV_TX_OK; |
1083 | ||
1084 | drop: | |
1085 | dev->stats.tx_dropped++; | |
1086 | goto tx_free; | |
1087 | ||
1088 | tx_error: | |
1089 | dev->stats.tx_errors++; | |
1090 | tx_free: | |
1091 | dev_kfree_skb(skb); | |
1092 | return NETDEV_TX_OK; | |
1093 | } | |
1094 | ||
6681712d DS |
1095 | /* Transmit local packets over Vxlan |
1096 | * | |
1097 | * Outer IP header inherits ECN and DF from inner header. | |
1098 | * Outer UDP destination is the VXLAN assigned port. | |
1099 | * source port is based on hash of flow | |
1100 | */ | |
1101 | static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev) | |
1102 | { | |
1103 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1104 | struct ethhdr *eth; | |
1105 | bool did_rsc = false; | |
c7995c43 | 1106 | struct vxlan_rdst *rdst0, *rdst; |
6681712d DS |
1107 | struct vxlan_fdb *f; |
1108 | int rc1, rc; | |
1109 | ||
1110 | skb_reset_mac_header(skb); | |
1111 | eth = eth_hdr(skb); | |
1112 | ||
1113 | if ((vxlan->flags & VXLAN_F_PROXY) && ntohs(eth->h_proto) == ETH_P_ARP) | |
1114 | return arp_reduce(dev, skb); | |
6681712d DS |
1115 | |
1116 | f = vxlan_find_mac(vxlan, eth->h_dest); | |
ae884082 DS |
1117 | did_rsc = false; |
1118 | ||
1119 | if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) && | |
1120 | ntohs(eth->h_proto) == ETH_P_IP) { | |
1121 | did_rsc = route_shortcircuit(dev, skb); | |
1122 | if (did_rsc) | |
1123 | f = vxlan_find_mac(vxlan, eth->h_dest); | |
1124 | } | |
1125 | ||
6681712d | 1126 | if (f == NULL) { |
c7995c43 AW |
1127 | rdst0 = &vxlan->default_dst; |
1128 | ||
1129 | if (rdst0->remote_ip == htonl(INADDR_ANY) && | |
6681712d DS |
1130 | (vxlan->flags & VXLAN_F_L2MISS) && |
1131 | !is_multicast_ether_addr(eth->h_dest)) | |
1132 | vxlan_fdb_miss(vxlan, eth->h_dest); | |
1133 | } else | |
1134 | rdst0 = &f->remote; | |
1135 | ||
1136 | rc = NETDEV_TX_OK; | |
1137 | ||
1138 | /* if there are multiple destinations, send copies */ | |
1139 | for (rdst = rdst0->remote_next; rdst; rdst = rdst->remote_next) { | |
1140 | struct sk_buff *skb1; | |
1141 | ||
1142 | skb1 = skb_clone(skb, GFP_ATOMIC); | |
1143 | rc1 = vxlan_xmit_one(skb1, dev, rdst, did_rsc); | |
1144 | if (rc == NETDEV_TX_OK) | |
1145 | rc = rc1; | |
1146 | } | |
1147 | ||
1148 | rc1 = vxlan_xmit_one(skb, dev, rdst0, did_rsc); | |
1149 | if (rc == NETDEV_TX_OK) | |
1150 | rc = rc1; | |
1151 | return rc; | |
1152 | } | |
1153 | ||
d342894c | 1154 | /* Walk the forwarding table and purge stale entries */ |
1155 | static void vxlan_cleanup(unsigned long arg) | |
1156 | { | |
1157 | struct vxlan_dev *vxlan = (struct vxlan_dev *) arg; | |
1158 | unsigned long next_timer = jiffies + FDB_AGE_INTERVAL; | |
1159 | unsigned int h; | |
1160 | ||
1161 | if (!netif_running(vxlan->dev)) | |
1162 | return; | |
1163 | ||
1164 | spin_lock_bh(&vxlan->hash_lock); | |
1165 | for (h = 0; h < FDB_HASH_SIZE; ++h) { | |
1166 | struct hlist_node *p, *n; | |
1167 | hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) { | |
1168 | struct vxlan_fdb *f | |
1169 | = container_of(p, struct vxlan_fdb, hlist); | |
1170 | unsigned long timeout; | |
1171 | ||
3c172868 | 1172 | if (f->state & NUD_PERMANENT) |
d342894c | 1173 | continue; |
1174 | ||
1175 | timeout = f->used + vxlan->age_interval * HZ; | |
1176 | if (time_before_eq(timeout, jiffies)) { | |
1177 | netdev_dbg(vxlan->dev, | |
1178 | "garbage collect %pM\n", | |
1179 | f->eth_addr); | |
1180 | f->state = NUD_STALE; | |
1181 | vxlan_fdb_destroy(vxlan, f); | |
1182 | } else if (time_before(timeout, next_timer)) | |
1183 | next_timer = timeout; | |
1184 | } | |
1185 | } | |
1186 | spin_unlock_bh(&vxlan->hash_lock); | |
1187 | ||
1188 | mod_timer(&vxlan->age_timer, next_timer); | |
1189 | } | |
1190 | ||
1191 | /* Setup stats when device is created */ | |
1192 | static int vxlan_init(struct net_device *dev) | |
1193 | { | |
e8171045 PS |
1194 | dev->tstats = alloc_percpu(struct pcpu_tstats); |
1195 | if (!dev->tstats) | |
d342894c | 1196 | return -ENOMEM; |
1197 | ||
1198 | return 0; | |
1199 | } | |
1200 | ||
1201 | /* Start ageing timer and join group when device is brought up */ | |
1202 | static int vxlan_open(struct net_device *dev) | |
1203 | { | |
1204 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1205 | int err; | |
1206 | ||
c7995c43 | 1207 | if (IN_MULTICAST(ntohl(vxlan->default_dst.remote_ip))) { |
d342894c | 1208 | err = vxlan_join_group(dev); |
1209 | if (err) | |
1210 | return err; | |
1211 | } | |
1212 | ||
1213 | if (vxlan->age_interval) | |
1214 | mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL); | |
1215 | ||
1216 | return 0; | |
1217 | } | |
1218 | ||
1219 | /* Purge the forwarding table */ | |
1220 | static void vxlan_flush(struct vxlan_dev *vxlan) | |
1221 | { | |
1222 | unsigned h; | |
1223 | ||
1224 | spin_lock_bh(&vxlan->hash_lock); | |
1225 | for (h = 0; h < FDB_HASH_SIZE; ++h) { | |
1226 | struct hlist_node *p, *n; | |
1227 | hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) { | |
1228 | struct vxlan_fdb *f | |
1229 | = container_of(p, struct vxlan_fdb, hlist); | |
1230 | vxlan_fdb_destroy(vxlan, f); | |
1231 | } | |
1232 | } | |
1233 | spin_unlock_bh(&vxlan->hash_lock); | |
1234 | } | |
1235 | ||
1236 | /* Cleanup timer and forwarding table on shutdown */ | |
1237 | static int vxlan_stop(struct net_device *dev) | |
1238 | { | |
1239 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1240 | ||
c7995c43 | 1241 | if (IN_MULTICAST(ntohl(vxlan->default_dst.remote_ip))) |
d342894c | 1242 | vxlan_leave_group(dev); |
1243 | ||
1244 | del_timer_sync(&vxlan->age_timer); | |
1245 | ||
1246 | vxlan_flush(vxlan); | |
1247 | ||
1248 | return 0; | |
1249 | } | |
1250 | ||
d342894c | 1251 | /* Stub, nothing needs to be done. */ |
1252 | static void vxlan_set_multicast_list(struct net_device *dev) | |
1253 | { | |
1254 | } | |
1255 | ||
1256 | static const struct net_device_ops vxlan_netdev_ops = { | |
1257 | .ndo_init = vxlan_init, | |
1258 | .ndo_open = vxlan_open, | |
1259 | .ndo_stop = vxlan_stop, | |
1260 | .ndo_start_xmit = vxlan_xmit, | |
e8171045 | 1261 | .ndo_get_stats64 = ip_tunnel_get_stats64, |
d342894c | 1262 | .ndo_set_rx_mode = vxlan_set_multicast_list, |
1263 | .ndo_change_mtu = eth_change_mtu, | |
1264 | .ndo_validate_addr = eth_validate_addr, | |
1265 | .ndo_set_mac_address = eth_mac_addr, | |
1266 | .ndo_fdb_add = vxlan_fdb_add, | |
1267 | .ndo_fdb_del = vxlan_fdb_delete, | |
1268 | .ndo_fdb_dump = vxlan_fdb_dump, | |
1269 | }; | |
1270 | ||
1271 | /* Info for udev, that this is a virtual tunnel endpoint */ | |
1272 | static struct device_type vxlan_type = { | |
1273 | .name = "vxlan", | |
1274 | }; | |
1275 | ||
1276 | static void vxlan_free(struct net_device *dev) | |
1277 | { | |
e8171045 | 1278 | free_percpu(dev->tstats); |
d342894c | 1279 | free_netdev(dev); |
1280 | } | |
1281 | ||
1282 | /* Initialize the device structure. */ | |
1283 | static void vxlan_setup(struct net_device *dev) | |
1284 | { | |
1285 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1286 | unsigned h; | |
05f47d69 | 1287 | int low, high; |
d342894c | 1288 | |
1289 | eth_hw_addr_random(dev); | |
1290 | ether_setup(dev); | |
2840bf22 | 1291 | dev->hard_header_len = ETH_HLEN + VXLAN_HEADROOM; |
d342894c | 1292 | |
1293 | dev->netdev_ops = &vxlan_netdev_ops; | |
1294 | dev->destructor = vxlan_free; | |
1295 | SET_NETDEV_DEVTYPE(dev, &vxlan_type); | |
1296 | ||
1297 | dev->tx_queue_len = 0; | |
1298 | dev->features |= NETIF_F_LLTX; | |
1299 | dev->features |= NETIF_F_NETNS_LOCAL; | |
d6727fe3 | 1300 | dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM; |
0afb1666 | 1301 | dev->features |= NETIF_F_RXCSUM; |
05c0db08 | 1302 | dev->features |= NETIF_F_GSO_SOFTWARE; |
0afb1666 JG |
1303 | |
1304 | dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM; | |
05c0db08 | 1305 | dev->hw_features |= NETIF_F_GSO_SOFTWARE; |
d342894c | 1306 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
6602d007 | 1307 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
d342894c | 1308 | |
1309 | spin_lock_init(&vxlan->hash_lock); | |
1310 | ||
1311 | init_timer_deferrable(&vxlan->age_timer); | |
1312 | vxlan->age_timer.function = vxlan_cleanup; | |
1313 | vxlan->age_timer.data = (unsigned long) vxlan; | |
1314 | ||
05f47d69 | 1315 | inet_get_local_port_range(&low, &high); |
1316 | vxlan->port_min = low; | |
1317 | vxlan->port_max = high; | |
823aa873 | 1318 | vxlan->dst_port = htons(vxlan_port); |
05f47d69 | 1319 | |
d342894c | 1320 | vxlan->dev = dev; |
1321 | ||
1322 | for (h = 0; h < FDB_HASH_SIZE; ++h) | |
1323 | INIT_HLIST_HEAD(&vxlan->fdb_head[h]); | |
1324 | } | |
1325 | ||
1326 | static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = { | |
1327 | [IFLA_VXLAN_ID] = { .type = NLA_U32 }, | |
5d174dd8 | 1328 | [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) }, |
d342894c | 1329 | [IFLA_VXLAN_LINK] = { .type = NLA_U32 }, |
1330 | [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) }, | |
1331 | [IFLA_VXLAN_TOS] = { .type = NLA_U8 }, | |
1332 | [IFLA_VXLAN_TTL] = { .type = NLA_U8 }, | |
1333 | [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 }, | |
1334 | [IFLA_VXLAN_AGEING] = { .type = NLA_U32 }, | |
1335 | [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 }, | |
05f47d69 | 1336 | [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) }, |
e4f67add DS |
1337 | [IFLA_VXLAN_PROXY] = { .type = NLA_U8 }, |
1338 | [IFLA_VXLAN_RSC] = { .type = NLA_U8 }, | |
1339 | [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 }, | |
1340 | [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 }, | |
823aa873 | 1341 | [IFLA_VXLAN_PORT] = { .type = NLA_U16 }, |
d342894c | 1342 | }; |
1343 | ||
1344 | static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[]) | |
1345 | { | |
1346 | if (tb[IFLA_ADDRESS]) { | |
1347 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { | |
1348 | pr_debug("invalid link address (not ethernet)\n"); | |
1349 | return -EINVAL; | |
1350 | } | |
1351 | ||
1352 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { | |
1353 | pr_debug("invalid all zero ethernet address\n"); | |
1354 | return -EADDRNOTAVAIL; | |
1355 | } | |
1356 | } | |
1357 | ||
1358 | if (!data) | |
1359 | return -EINVAL; | |
1360 | ||
1361 | if (data[IFLA_VXLAN_ID]) { | |
1362 | __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]); | |
1363 | if (id >= VXLAN_VID_MASK) | |
1364 | return -ERANGE; | |
1365 | } | |
1366 | ||
05f47d69 | 1367 | if (data[IFLA_VXLAN_PORT_RANGE]) { |
1368 | const struct ifla_vxlan_port_range *p | |
1369 | = nla_data(data[IFLA_VXLAN_PORT_RANGE]); | |
1370 | ||
1371 | if (ntohs(p->high) < ntohs(p->low)) { | |
1372 | pr_debug("port range %u .. %u not valid\n", | |
1373 | ntohs(p->low), ntohs(p->high)); | |
1374 | return -EINVAL; | |
1375 | } | |
1376 | } | |
1377 | ||
d342894c | 1378 | return 0; |
1379 | } | |
1380 | ||
1b13c97f YB |
1381 | static void vxlan_get_drvinfo(struct net_device *netdev, |
1382 | struct ethtool_drvinfo *drvinfo) | |
1383 | { | |
1384 | strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version)); | |
1385 | strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver)); | |
1386 | } | |
1387 | ||
1388 | static const struct ethtool_ops vxlan_ethtool_ops = { | |
1389 | .get_drvinfo = vxlan_get_drvinfo, | |
1390 | .get_link = ethtool_op_get_link, | |
1391 | }; | |
1392 | ||
d342894c | 1393 | static int vxlan_newlink(struct net *net, struct net_device *dev, |
1394 | struct nlattr *tb[], struct nlattr *data[]) | |
1395 | { | |
1396 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
c7995c43 | 1397 | struct vxlan_rdst *dst = &vxlan->default_dst; |
d342894c | 1398 | __u32 vni; |
1399 | int err; | |
1400 | ||
1401 | if (!data[IFLA_VXLAN_ID]) | |
1402 | return -EINVAL; | |
1403 | ||
1404 | vni = nla_get_u32(data[IFLA_VXLAN_ID]); | |
1405 | if (vxlan_find_vni(net, vni)) { | |
1406 | pr_info("duplicate VNI %u\n", vni); | |
1407 | return -EEXIST; | |
1408 | } | |
c7995c43 | 1409 | dst->remote_vni = vni; |
d342894c | 1410 | |
5d174dd8 | 1411 | if (data[IFLA_VXLAN_GROUP]) |
1412 | dst->remote_ip = nla_get_be32(data[IFLA_VXLAN_GROUP]); | |
d342894c | 1413 | |
1414 | if (data[IFLA_VXLAN_LOCAL]) | |
1415 | vxlan->saddr = nla_get_be32(data[IFLA_VXLAN_LOCAL]); | |
1416 | ||
34e02aa1 | 1417 | if (data[IFLA_VXLAN_LINK] && |
c7995c43 | 1418 | (dst->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]))) { |
34e02aa1 | 1419 | struct net_device *lowerdev |
c7995c43 | 1420 | = __dev_get_by_index(net, dst->remote_ifindex); |
34e02aa1 | 1421 | |
1422 | if (!lowerdev) { | |
c7995c43 | 1423 | pr_info("ifindex %d does not exist\n", dst->remote_ifindex); |
34e02aa1 | 1424 | return -ENODEV; |
1425 | } | |
d342894c | 1426 | |
34e02aa1 | 1427 | if (!tb[IFLA_MTU]) |
d342894c | 1428 | dev->mtu = lowerdev->mtu - VXLAN_HEADROOM; |
1ba56fb4 AD |
1429 | |
1430 | /* update header length based on lower device */ | |
1431 | dev->hard_header_len = lowerdev->hard_header_len + | |
1432 | VXLAN_HEADROOM; | |
d342894c | 1433 | } |
1434 | ||
1435 | if (data[IFLA_VXLAN_TOS]) | |
1436 | vxlan->tos = nla_get_u8(data[IFLA_VXLAN_TOS]); | |
1437 | ||
afb97186 VB |
1438 | if (data[IFLA_VXLAN_TTL]) |
1439 | vxlan->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]); | |
1440 | ||
d342894c | 1441 | if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING])) |
e4f67add | 1442 | vxlan->flags |= VXLAN_F_LEARN; |
d342894c | 1443 | |
1444 | if (data[IFLA_VXLAN_AGEING]) | |
1445 | vxlan->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]); | |
1446 | else | |
1447 | vxlan->age_interval = FDB_AGE_DEFAULT; | |
1448 | ||
e4f67add DS |
1449 | if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY])) |
1450 | vxlan->flags |= VXLAN_F_PROXY; | |
1451 | ||
1452 | if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC])) | |
1453 | vxlan->flags |= VXLAN_F_RSC; | |
1454 | ||
1455 | if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS])) | |
1456 | vxlan->flags |= VXLAN_F_L2MISS; | |
1457 | ||
1458 | if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS])) | |
1459 | vxlan->flags |= VXLAN_F_L3MISS; | |
1460 | ||
d342894c | 1461 | if (data[IFLA_VXLAN_LIMIT]) |
1462 | vxlan->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]); | |
1463 | ||
05f47d69 | 1464 | if (data[IFLA_VXLAN_PORT_RANGE]) { |
1465 | const struct ifla_vxlan_port_range *p | |
1466 | = nla_data(data[IFLA_VXLAN_PORT_RANGE]); | |
1467 | vxlan->port_min = ntohs(p->low); | |
1468 | vxlan->port_max = ntohs(p->high); | |
1469 | } | |
1470 | ||
823aa873 | 1471 | if (data[IFLA_VXLAN_PORT]) |
1472 | vxlan->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]); | |
1473 | ||
1b13c97f YB |
1474 | SET_ETHTOOL_OPS(dev, &vxlan_ethtool_ops); |
1475 | ||
d342894c | 1476 | err = register_netdevice(dev); |
1477 | if (!err) | |
c7995c43 | 1478 | hlist_add_head_rcu(&vxlan->hlist, vni_head(net, dst->remote_vni)); |
d342894c | 1479 | |
1480 | return err; | |
1481 | } | |
1482 | ||
1483 | static void vxlan_dellink(struct net_device *dev, struct list_head *head) | |
1484 | { | |
1485 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1486 | ||
1487 | hlist_del_rcu(&vxlan->hlist); | |
1488 | ||
1489 | unregister_netdevice_queue(dev, head); | |
1490 | } | |
1491 | ||
1492 | static size_t vxlan_get_size(const struct net_device *dev) | |
1493 | { | |
1494 | ||
1495 | return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */ | |
5d174dd8 | 1496 | nla_total_size(sizeof(__be32)) +/* IFLA_VXLAN_GROUP */ |
d342894c | 1497 | nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */ |
1498 | nla_total_size(sizeof(__be32))+ /* IFLA_VXLAN_LOCAL */ | |
1499 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */ | |
1500 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */ | |
1501 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */ | |
e4f67add DS |
1502 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */ |
1503 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */ | |
1504 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */ | |
1505 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */ | |
d342894c | 1506 | nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */ |
1507 | nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */ | |
05f47d69 | 1508 | nla_total_size(sizeof(struct ifla_vxlan_port_range)) + |
823aa873 | 1509 | nla_total_size(sizeof(__be16))+ /* IFLA_VXLAN_PORT */ |
d342894c | 1510 | 0; |
1511 | } | |
1512 | ||
1513 | static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
1514 | { | |
1515 | const struct vxlan_dev *vxlan = netdev_priv(dev); | |
c7995c43 | 1516 | const struct vxlan_rdst *dst = &vxlan->default_dst; |
05f47d69 | 1517 | struct ifla_vxlan_port_range ports = { |
1518 | .low = htons(vxlan->port_min), | |
1519 | .high = htons(vxlan->port_max), | |
1520 | }; | |
d342894c | 1521 | |
c7995c43 | 1522 | if (nla_put_u32(skb, IFLA_VXLAN_ID, dst->remote_vni)) |
d342894c | 1523 | goto nla_put_failure; |
1524 | ||
5d174dd8 | 1525 | if (dst->remote_ip && nla_put_be32(skb, IFLA_VXLAN_GROUP, dst->remote_ip)) |
d342894c | 1526 | goto nla_put_failure; |
1527 | ||
c7995c43 | 1528 | if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex)) |
d342894c | 1529 | goto nla_put_failure; |
1530 | ||
7c41c42c | 1531 | if (vxlan->saddr && nla_put_be32(skb, IFLA_VXLAN_LOCAL, vxlan->saddr)) |
d342894c | 1532 | goto nla_put_failure; |
1533 | ||
1534 | if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->ttl) || | |
1535 | nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->tos) || | |
e4f67add DS |
1536 | nla_put_u8(skb, IFLA_VXLAN_LEARNING, |
1537 | !!(vxlan->flags & VXLAN_F_LEARN)) || | |
1538 | nla_put_u8(skb, IFLA_VXLAN_PROXY, | |
1539 | !!(vxlan->flags & VXLAN_F_PROXY)) || | |
1540 | nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) || | |
1541 | nla_put_u8(skb, IFLA_VXLAN_L2MISS, | |
1542 | !!(vxlan->flags & VXLAN_F_L2MISS)) || | |
1543 | nla_put_u8(skb, IFLA_VXLAN_L3MISS, | |
1544 | !!(vxlan->flags & VXLAN_F_L3MISS)) || | |
d342894c | 1545 | nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->age_interval) || |
823aa873 | 1546 | nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->addrmax) || |
1547 | nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->dst_port)) | |
d342894c | 1548 | goto nla_put_failure; |
1549 | ||
05f47d69 | 1550 | if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports)) |
1551 | goto nla_put_failure; | |
1552 | ||
d342894c | 1553 | return 0; |
1554 | ||
1555 | nla_put_failure: | |
1556 | return -EMSGSIZE; | |
1557 | } | |
1558 | ||
1559 | static struct rtnl_link_ops vxlan_link_ops __read_mostly = { | |
1560 | .kind = "vxlan", | |
1561 | .maxtype = IFLA_VXLAN_MAX, | |
1562 | .policy = vxlan_policy, | |
1563 | .priv_size = sizeof(struct vxlan_dev), | |
1564 | .setup = vxlan_setup, | |
1565 | .validate = vxlan_validate, | |
1566 | .newlink = vxlan_newlink, | |
1567 | .dellink = vxlan_dellink, | |
1568 | .get_size = vxlan_get_size, | |
1569 | .fill_info = vxlan_fill_info, | |
1570 | }; | |
1571 | ||
1572 | static __net_init int vxlan_init_net(struct net *net) | |
1573 | { | |
1574 | struct vxlan_net *vn = net_generic(net, vxlan_net_id); | |
1575 | struct sock *sk; | |
1576 | struct sockaddr_in vxlan_addr = { | |
1577 | .sin_family = AF_INET, | |
1578 | .sin_addr.s_addr = htonl(INADDR_ANY), | |
1579 | }; | |
1580 | int rc; | |
1581 | unsigned h; | |
1582 | ||
1583 | /* Create UDP socket for encapsulation receive. */ | |
1584 | rc = sock_create_kern(AF_INET, SOCK_DGRAM, IPPROTO_UDP, &vn->sock); | |
1585 | if (rc < 0) { | |
1586 | pr_debug("UDP socket create failed\n"); | |
1587 | return rc; | |
1588 | } | |
bfe1b9b1 | 1589 | /* Put in proper namespace */ |
1590 | sk = vn->sock->sk; | |
1591 | sk_change_net(sk, net); | |
d342894c | 1592 | |
1593 | vxlan_addr.sin_port = htons(vxlan_port); | |
1594 | ||
1595 | rc = kernel_bind(vn->sock, (struct sockaddr *) &vxlan_addr, | |
1596 | sizeof(vxlan_addr)); | |
1597 | if (rc < 0) { | |
1598 | pr_debug("bind for UDP socket %pI4:%u (%d)\n", | |
1599 | &vxlan_addr.sin_addr, ntohs(vxlan_addr.sin_port), rc); | |
bfe1b9b1 | 1600 | sk_release_kernel(sk); |
d342894c | 1601 | vn->sock = NULL; |
1602 | return rc; | |
1603 | } | |
1604 | ||
1605 | /* Disable multicast loopback */ | |
d342894c | 1606 | inet_sk(sk)->mc_loop = 0; |
1607 | ||
1608 | /* Mark socket as an encapsulation socket. */ | |
1609 | udp_sk(sk)->encap_type = 1; | |
1610 | udp_sk(sk)->encap_rcv = vxlan_udp_encap_recv; | |
1611 | udp_encap_enable(); | |
1612 | ||
1613 | for (h = 0; h < VNI_HASH_SIZE; ++h) | |
1614 | INIT_HLIST_HEAD(&vn->vni_list[h]); | |
1615 | ||
1616 | return 0; | |
1617 | } | |
1618 | ||
1619 | static __net_exit void vxlan_exit_net(struct net *net) | |
1620 | { | |
1621 | struct vxlan_net *vn = net_generic(net, vxlan_net_id); | |
9cb6cb7e ZM |
1622 | struct vxlan_dev *vxlan; |
1623 | unsigned h; | |
1624 | ||
1625 | rtnl_lock(); | |
1626 | for (h = 0; h < VNI_HASH_SIZE; ++h) | |
1627 | hlist_for_each_entry(vxlan, &vn->vni_list[h], hlist) | |
1628 | dev_close(vxlan->dev); | |
1629 | rtnl_unlock(); | |
d342894c | 1630 | |
1631 | if (vn->sock) { | |
bfe1b9b1 | 1632 | sk_release_kernel(vn->sock->sk); |
d342894c | 1633 | vn->sock = NULL; |
1634 | } | |
1635 | } | |
1636 | ||
1637 | static struct pernet_operations vxlan_net_ops = { | |
1638 | .init = vxlan_init_net, | |
1639 | .exit = vxlan_exit_net, | |
1640 | .id = &vxlan_net_id, | |
1641 | .size = sizeof(struct vxlan_net), | |
1642 | }; | |
1643 | ||
1644 | static int __init vxlan_init_module(void) | |
1645 | { | |
1646 | int rc; | |
1647 | ||
1648 | get_random_bytes(&vxlan_salt, sizeof(vxlan_salt)); | |
1649 | ||
1650 | rc = register_pernet_device(&vxlan_net_ops); | |
1651 | if (rc) | |
1652 | goto out1; | |
1653 | ||
1654 | rc = rtnl_link_register(&vxlan_link_ops); | |
1655 | if (rc) | |
1656 | goto out2; | |
1657 | ||
1658 | return 0; | |
1659 | ||
1660 | out2: | |
1661 | unregister_pernet_device(&vxlan_net_ops); | |
1662 | out1: | |
1663 | return rc; | |
1664 | } | |
1665 | module_init(vxlan_init_module); | |
1666 | ||
1667 | static void __exit vxlan_cleanup_module(void) | |
1668 | { | |
1669 | rtnl_link_unregister(&vxlan_link_ops); | |
1670 | unregister_pernet_device(&vxlan_net_ops); | |
6681712d | 1671 | rcu_barrier(); |
d342894c | 1672 | } |
1673 | module_exit(vxlan_cleanup_module); | |
1674 | ||
1675 | MODULE_LICENSE("GPL"); | |
1676 | MODULE_VERSION(VXLAN_VERSION); | |
3b8df3c6 | 1677 | MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>"); |
d342894c | 1678 | MODULE_ALIAS_RTNL_LINK("vxlan"); |