Commit | Line | Data |
---|---|---|
d342894c | 1 | /* |
eb5ce439 | 2 | * VXLAN: Virtual eXtensible Local Area Network |
d342894c | 3 | * |
4 | * Copyright (c) 2012 Vyatta Inc. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | * TODO | |
11 | * - use IANA UDP port number (when defined) | |
12 | * - IPv6 (not in RFC) | |
13 | */ | |
14 | ||
15 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
16 | ||
17 | #include <linux/kernel.h> | |
18 | #include <linux/types.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/errno.h> | |
21 | #include <linux/slab.h> | |
22 | #include <linux/skbuff.h> | |
23 | #include <linux/rculist.h> | |
24 | #include <linux/netdevice.h> | |
25 | #include <linux/in.h> | |
26 | #include <linux/ip.h> | |
27 | #include <linux/udp.h> | |
28 | #include <linux/igmp.h> | |
29 | #include <linux/etherdevice.h> | |
30 | #include <linux/if_ether.h> | |
d342894c | 31 | #include <linux/hash.h> |
1b13c97f | 32 | #include <linux/ethtool.h> |
e4f67add DS |
33 | #include <net/arp.h> |
34 | #include <net/ndisc.h> | |
d342894c | 35 | #include <net/ip.h> |
c5441932 | 36 | #include <net/ip_tunnels.h> |
d342894c | 37 | #include <net/icmp.h> |
38 | #include <net/udp.h> | |
39 | #include <net/rtnetlink.h> | |
40 | #include <net/route.h> | |
41 | #include <net/dsfield.h> | |
42 | #include <net/inet_ecn.h> | |
43 | #include <net/net_namespace.h> | |
44 | #include <net/netns/generic.h> | |
45 | ||
46 | #define VXLAN_VERSION "0.1" | |
47 | ||
48 | #define VNI_HASH_BITS 10 | |
49 | #define VNI_HASH_SIZE (1<<VNI_HASH_BITS) | |
50 | #define FDB_HASH_BITS 8 | |
51 | #define FDB_HASH_SIZE (1<<FDB_HASH_BITS) | |
52 | #define FDB_AGE_DEFAULT 300 /* 5 min */ | |
53 | #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */ | |
54 | ||
55 | #define VXLAN_N_VID (1u << 24) | |
56 | #define VXLAN_VID_MASK (VXLAN_N_VID - 1) | |
52b702ff AD |
57 | /* IP header + UDP + VXLAN + Ethernet header */ |
58 | #define VXLAN_HEADROOM (20 + 8 + 8 + 14) | |
d342894c | 59 | |
60 | #define VXLAN_FLAGS 0x08000000 /* struct vxlanhdr.vx_flags required value. */ | |
61 | ||
62 | /* VXLAN protocol header */ | |
63 | struct vxlanhdr { | |
64 | __be32 vx_flags; | |
65 | __be32 vx_vni; | |
66 | }; | |
67 | ||
68 | /* UDP port for VXLAN traffic. */ | |
69 | static unsigned int vxlan_port __read_mostly = 8472; | |
70 | module_param_named(udp_port, vxlan_port, uint, 0444); | |
71 | MODULE_PARM_DESC(udp_port, "Destination UDP port"); | |
72 | ||
73 | static bool log_ecn_error = true; | |
74 | module_param(log_ecn_error, bool, 0644); | |
75 | MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); | |
76 | ||
77 | /* per-net private data for this module */ | |
78 | static unsigned int vxlan_net_id; | |
79 | struct vxlan_net { | |
80 | struct socket *sock; /* UDP encap socket */ | |
81 | struct hlist_head vni_list[VNI_HASH_SIZE]; | |
82 | }; | |
83 | ||
6681712d DS |
84 | struct vxlan_rdst { |
85 | struct rcu_head rcu; | |
86 | __be32 remote_ip; | |
87 | __be16 remote_port; | |
88 | u32 remote_vni; | |
89 | u32 remote_ifindex; | |
90 | struct vxlan_rdst *remote_next; | |
91 | }; | |
92 | ||
d342894c | 93 | /* Forwarding table entry */ |
94 | struct vxlan_fdb { | |
95 | struct hlist_node hlist; /* linked list of entries */ | |
96 | struct rcu_head rcu; | |
97 | unsigned long updated; /* jiffies */ | |
98 | unsigned long used; | |
6681712d | 99 | struct vxlan_rdst remote; |
d342894c | 100 | u16 state; /* see ndm_state */ |
101 | u8 eth_addr[ETH_ALEN]; | |
102 | }; | |
103 | ||
104 | /* Per-cpu network traffic stats */ | |
105 | struct vxlan_stats { | |
106 | u64 rx_packets; | |
107 | u64 rx_bytes; | |
108 | u64 tx_packets; | |
109 | u64 tx_bytes; | |
110 | struct u64_stats_sync syncp; | |
111 | }; | |
112 | ||
113 | /* Pseudo network device */ | |
114 | struct vxlan_dev { | |
115 | struct hlist_node hlist; | |
116 | struct net_device *dev; | |
117 | struct vxlan_stats __percpu *stats; | |
118 | __u32 vni; /* virtual network id */ | |
119 | __be32 gaddr; /* multicast group */ | |
120 | __be32 saddr; /* source address */ | |
121 | unsigned int link; /* link to multicast over */ | |
05f47d69 | 122 | __u16 port_min; /* source port range */ |
123 | __u16 port_max; | |
d342894c | 124 | __u8 tos; /* TOS override */ |
125 | __u8 ttl; | |
e4f67add | 126 | u32 flags; /* VXLAN_F_* below */ |
d342894c | 127 | |
128 | unsigned long age_interval; | |
129 | struct timer_list age_timer; | |
130 | spinlock_t hash_lock; | |
131 | unsigned int addrcnt; | |
132 | unsigned int addrmax; | |
d342894c | 133 | |
134 | struct hlist_head fdb_head[FDB_HASH_SIZE]; | |
135 | }; | |
136 | ||
e4f67add DS |
137 | #define VXLAN_F_LEARN 0x01 |
138 | #define VXLAN_F_PROXY 0x02 | |
139 | #define VXLAN_F_RSC 0x04 | |
140 | #define VXLAN_F_L2MISS 0x08 | |
141 | #define VXLAN_F_L3MISS 0x10 | |
142 | ||
d342894c | 143 | /* salt for hash table */ |
144 | static u32 vxlan_salt __read_mostly; | |
145 | ||
146 | static inline struct hlist_head *vni_head(struct net *net, u32 id) | |
147 | { | |
148 | struct vxlan_net *vn = net_generic(net, vxlan_net_id); | |
149 | ||
150 | return &vn->vni_list[hash_32(id, VNI_HASH_BITS)]; | |
151 | } | |
152 | ||
153 | /* Look up VNI in a per net namespace table */ | |
154 | static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id) | |
155 | { | |
156 | struct vxlan_dev *vxlan; | |
d342894c | 157 | |
b67bfe0d | 158 | hlist_for_each_entry_rcu(vxlan, vni_head(net, id), hlist) { |
d342894c | 159 | if (vxlan->vni == id) |
160 | return vxlan; | |
161 | } | |
162 | ||
163 | return NULL; | |
164 | } | |
165 | ||
166 | /* Fill in neighbour message in skbuff. */ | |
167 | static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan, | |
168 | const struct vxlan_fdb *fdb, | |
6681712d DS |
169 | u32 portid, u32 seq, int type, unsigned int flags, |
170 | const struct vxlan_rdst *rdst) | |
d342894c | 171 | { |
172 | unsigned long now = jiffies; | |
173 | struct nda_cacheinfo ci; | |
174 | struct nlmsghdr *nlh; | |
175 | struct ndmsg *ndm; | |
e4f67add | 176 | bool send_ip, send_eth; |
d342894c | 177 | |
178 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags); | |
179 | if (nlh == NULL) | |
180 | return -EMSGSIZE; | |
181 | ||
182 | ndm = nlmsg_data(nlh); | |
183 | memset(ndm, 0, sizeof(*ndm)); | |
e4f67add DS |
184 | |
185 | send_eth = send_ip = true; | |
186 | ||
187 | if (type == RTM_GETNEIGH) { | |
188 | ndm->ndm_family = AF_INET; | |
6681712d | 189 | send_ip = rdst->remote_ip != htonl(INADDR_ANY); |
e4f67add DS |
190 | send_eth = !is_zero_ether_addr(fdb->eth_addr); |
191 | } else | |
192 | ndm->ndm_family = AF_BRIDGE; | |
d342894c | 193 | ndm->ndm_state = fdb->state; |
194 | ndm->ndm_ifindex = vxlan->dev->ifindex; | |
195 | ndm->ndm_flags = NTF_SELF; | |
196 | ndm->ndm_type = NDA_DST; | |
197 | ||
e4f67add | 198 | if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr)) |
d342894c | 199 | goto nla_put_failure; |
200 | ||
6681712d DS |
201 | if (send_ip && nla_put_be32(skb, NDA_DST, rdst->remote_ip)) |
202 | goto nla_put_failure; | |
203 | ||
204 | if (rdst->remote_port && rdst->remote_port != vxlan_port && | |
205 | nla_put_be16(skb, NDA_PORT, rdst->remote_port)) | |
206 | goto nla_put_failure; | |
207 | if (rdst->remote_vni != vxlan->vni && | |
208 | nla_put_be32(skb, NDA_VNI, rdst->remote_vni)) | |
209 | goto nla_put_failure; | |
210 | if (rdst->remote_ifindex && | |
211 | nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex)) | |
d342894c | 212 | goto nla_put_failure; |
213 | ||
214 | ci.ndm_used = jiffies_to_clock_t(now - fdb->used); | |
215 | ci.ndm_confirmed = 0; | |
216 | ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated); | |
217 | ci.ndm_refcnt = 0; | |
218 | ||
219 | if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci)) | |
220 | goto nla_put_failure; | |
221 | ||
222 | return nlmsg_end(skb, nlh); | |
223 | ||
224 | nla_put_failure: | |
225 | nlmsg_cancel(skb, nlh); | |
226 | return -EMSGSIZE; | |
227 | } | |
228 | ||
229 | static inline size_t vxlan_nlmsg_size(void) | |
230 | { | |
231 | return NLMSG_ALIGN(sizeof(struct ndmsg)) | |
232 | + nla_total_size(ETH_ALEN) /* NDA_LLADDR */ | |
233 | + nla_total_size(sizeof(__be32)) /* NDA_DST */ | |
6681712d DS |
234 | + nla_total_size(sizeof(__be32)) /* NDA_PORT */ |
235 | + nla_total_size(sizeof(__be32)) /* NDA_VNI */ | |
236 | + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */ | |
d342894c | 237 | + nla_total_size(sizeof(struct nda_cacheinfo)); |
238 | } | |
239 | ||
240 | static void vxlan_fdb_notify(struct vxlan_dev *vxlan, | |
241 | const struct vxlan_fdb *fdb, int type) | |
242 | { | |
243 | struct net *net = dev_net(vxlan->dev); | |
244 | struct sk_buff *skb; | |
245 | int err = -ENOBUFS; | |
246 | ||
247 | skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC); | |
248 | if (skb == NULL) | |
249 | goto errout; | |
250 | ||
6681712d | 251 | err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, &fdb->remote); |
d342894c | 252 | if (err < 0) { |
253 | /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */ | |
254 | WARN_ON(err == -EMSGSIZE); | |
255 | kfree_skb(skb); | |
256 | goto errout; | |
257 | } | |
258 | ||
259 | rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); | |
260 | return; | |
261 | errout: | |
262 | if (err < 0) | |
263 | rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); | |
264 | } | |
265 | ||
e4f67add DS |
266 | static void vxlan_ip_miss(struct net_device *dev, __be32 ipa) |
267 | { | |
268 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
269 | struct vxlan_fdb f; | |
270 | ||
271 | memset(&f, 0, sizeof f); | |
272 | f.state = NUD_STALE; | |
6681712d DS |
273 | f.remote.remote_ip = ipa; /* goes to NDA_DST */ |
274 | f.remote.remote_vni = VXLAN_N_VID; | |
e4f67add DS |
275 | |
276 | vxlan_fdb_notify(vxlan, &f, RTM_GETNEIGH); | |
277 | } | |
278 | ||
279 | static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN]) | |
280 | { | |
281 | struct vxlan_fdb f; | |
282 | ||
283 | memset(&f, 0, sizeof f); | |
284 | f.state = NUD_STALE; | |
285 | memcpy(f.eth_addr, eth_addr, ETH_ALEN); | |
286 | ||
287 | vxlan_fdb_notify(vxlan, &f, RTM_GETNEIGH); | |
288 | } | |
289 | ||
d342894c | 290 | /* Hash Ethernet address */ |
291 | static u32 eth_hash(const unsigned char *addr) | |
292 | { | |
293 | u64 value = get_unaligned((u64 *)addr); | |
294 | ||
295 | /* only want 6 bytes */ | |
296 | #ifdef __BIG_ENDIAN | |
d342894c | 297 | value >>= 16; |
321fb991 | 298 | #else |
299 | value <<= 16; | |
d342894c | 300 | #endif |
301 | return hash_64(value, FDB_HASH_BITS); | |
302 | } | |
303 | ||
304 | /* Hash chain to use given mac address */ | |
305 | static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan, | |
306 | const u8 *mac) | |
307 | { | |
308 | return &vxlan->fdb_head[eth_hash(mac)]; | |
309 | } | |
310 | ||
311 | /* Look up Ethernet address in forwarding table */ | |
312 | static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan, | |
313 | const u8 *mac) | |
314 | ||
315 | { | |
316 | struct hlist_head *head = vxlan_fdb_head(vxlan, mac); | |
317 | struct vxlan_fdb *f; | |
d342894c | 318 | |
b67bfe0d | 319 | hlist_for_each_entry_rcu(f, head, hlist) { |
d342894c | 320 | if (compare_ether_addr(mac, f->eth_addr) == 0) |
321 | return f; | |
322 | } | |
323 | ||
324 | return NULL; | |
325 | } | |
326 | ||
6681712d DS |
327 | /* Add/update destinations for multicast */ |
328 | static int vxlan_fdb_append(struct vxlan_fdb *f, | |
329 | __be32 ip, __u32 port, __u32 vni, __u32 ifindex) | |
330 | { | |
331 | struct vxlan_rdst *rd_prev, *rd; | |
332 | ||
333 | rd_prev = NULL; | |
334 | for (rd = &f->remote; rd; rd = rd->remote_next) { | |
335 | if (rd->remote_ip == ip && | |
336 | rd->remote_port == port && | |
337 | rd->remote_vni == vni && | |
338 | rd->remote_ifindex == ifindex) | |
339 | return 0; | |
340 | rd_prev = rd; | |
341 | } | |
342 | rd = kmalloc(sizeof(*rd), GFP_ATOMIC); | |
343 | if (rd == NULL) | |
344 | return -ENOBUFS; | |
345 | rd->remote_ip = ip; | |
346 | rd->remote_port = port; | |
347 | rd->remote_vni = vni; | |
348 | rd->remote_ifindex = ifindex; | |
349 | rd->remote_next = NULL; | |
350 | rd_prev->remote_next = rd; | |
351 | return 1; | |
352 | } | |
353 | ||
d342894c | 354 | /* Add new entry to forwarding table -- assumes lock held */ |
355 | static int vxlan_fdb_create(struct vxlan_dev *vxlan, | |
356 | const u8 *mac, __be32 ip, | |
6681712d DS |
357 | __u16 state, __u16 flags, |
358 | __u32 port, __u32 vni, __u32 ifindex) | |
d342894c | 359 | { |
360 | struct vxlan_fdb *f; | |
361 | int notify = 0; | |
362 | ||
363 | f = vxlan_find_mac(vxlan, mac); | |
364 | if (f) { | |
365 | if (flags & NLM_F_EXCL) { | |
366 | netdev_dbg(vxlan->dev, | |
367 | "lost race to create %pM\n", mac); | |
368 | return -EEXIST; | |
369 | } | |
370 | if (f->state != state) { | |
371 | f->state = state; | |
372 | f->updated = jiffies; | |
373 | notify = 1; | |
374 | } | |
6681712d DS |
375 | if ((flags & NLM_F_APPEND) && |
376 | is_multicast_ether_addr(f->eth_addr)) { | |
377 | int rc = vxlan_fdb_append(f, ip, port, vni, ifindex); | |
378 | ||
379 | if (rc < 0) | |
380 | return rc; | |
381 | notify |= rc; | |
382 | } | |
d342894c | 383 | } else { |
384 | if (!(flags & NLM_F_CREATE)) | |
385 | return -ENOENT; | |
386 | ||
387 | if (vxlan->addrmax && vxlan->addrcnt >= vxlan->addrmax) | |
388 | return -ENOSPC; | |
389 | ||
390 | netdev_dbg(vxlan->dev, "add %pM -> %pI4\n", mac, &ip); | |
391 | f = kmalloc(sizeof(*f), GFP_ATOMIC); | |
392 | if (!f) | |
393 | return -ENOMEM; | |
394 | ||
395 | notify = 1; | |
6681712d DS |
396 | f->remote.remote_ip = ip; |
397 | f->remote.remote_port = port; | |
398 | f->remote.remote_vni = vni; | |
399 | f->remote.remote_ifindex = ifindex; | |
400 | f->remote.remote_next = NULL; | |
d342894c | 401 | f->state = state; |
402 | f->updated = f->used = jiffies; | |
403 | memcpy(f->eth_addr, mac, ETH_ALEN); | |
404 | ||
405 | ++vxlan->addrcnt; | |
406 | hlist_add_head_rcu(&f->hlist, | |
407 | vxlan_fdb_head(vxlan, mac)); | |
408 | } | |
409 | ||
410 | if (notify) | |
411 | vxlan_fdb_notify(vxlan, f, RTM_NEWNEIGH); | |
412 | ||
413 | return 0; | |
414 | } | |
415 | ||
6681712d DS |
416 | void vxlan_fdb_free(struct rcu_head *head) |
417 | { | |
418 | struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu); | |
419 | ||
420 | while (f->remote.remote_next) { | |
421 | struct vxlan_rdst *rd = f->remote.remote_next; | |
422 | ||
423 | f->remote.remote_next = rd->remote_next; | |
424 | kfree(rd); | |
425 | } | |
426 | kfree(f); | |
427 | } | |
428 | ||
d342894c | 429 | static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f) |
430 | { | |
431 | netdev_dbg(vxlan->dev, | |
432 | "delete %pM\n", f->eth_addr); | |
433 | ||
434 | --vxlan->addrcnt; | |
435 | vxlan_fdb_notify(vxlan, f, RTM_DELNEIGH); | |
436 | ||
437 | hlist_del_rcu(&f->hlist); | |
6681712d | 438 | call_rcu(&f->rcu, vxlan_fdb_free); |
d342894c | 439 | } |
440 | ||
441 | /* Add static entry (via netlink) */ | |
442 | static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], | |
443 | struct net_device *dev, | |
444 | const unsigned char *addr, u16 flags) | |
445 | { | |
446 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
6681712d | 447 | struct net *net = dev_net(vxlan->dev); |
d342894c | 448 | __be32 ip; |
6681712d | 449 | u32 port, 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 DS |
466 | if (tb[NDA_PORT]) { |
467 | if (nla_len(tb[NDA_PORT]) != sizeof(u32)) | |
468 | return -EINVAL; | |
469 | port = nla_get_u32(tb[NDA_PORT]); | |
470 | } else | |
471 | port = vxlan_port; | |
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 | |
478 | vni = vxlan->vni; | |
479 | ||
480 | if (tb[NDA_IFINDEX]) { | |
481 | struct net_device *dev; | |
482 | ||
483 | if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32)) | |
484 | return -EINVAL; | |
485 | ifindex = nla_get_u32(tb[NDA_IFINDEX]); | |
486 | dev = dev_get_by_index(net, ifindex); | |
487 | if (!dev) | |
488 | return -EADDRNOTAVAIL; | |
489 | dev_put(dev); | |
490 | } else | |
491 | ifindex = 0; | |
492 | ||
d342894c | 493 | spin_lock_bh(&vxlan->hash_lock); |
6681712d DS |
494 | err = vxlan_fdb_create(vxlan, addr, ip, ndm->ndm_state, flags, port, |
495 | vni, ifindex); | |
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 DS |
582 | NLM_F_EXCL|NLM_F_CREATE, |
583 | vxlan_port, vxlan->vni, 0); | |
d342894c | 584 | spin_unlock(&vxlan->hash_lock); |
585 | } | |
586 | } | |
587 | ||
588 | ||
589 | /* See if multicast group is already in use by other ID */ | |
590 | static bool vxlan_group_used(struct vxlan_net *vn, | |
591 | const struct vxlan_dev *this) | |
592 | { | |
593 | const struct vxlan_dev *vxlan; | |
d342894c | 594 | unsigned h; |
595 | ||
596 | for (h = 0; h < VNI_HASH_SIZE; ++h) | |
b67bfe0d | 597 | hlist_for_each_entry(vxlan, &vn->vni_list[h], hlist) { |
d342894c | 598 | if (vxlan == this) |
599 | continue; | |
600 | ||
601 | if (!netif_running(vxlan->dev)) | |
602 | continue; | |
603 | ||
604 | if (vxlan->gaddr == this->gaddr) | |
605 | return true; | |
606 | } | |
607 | ||
608 | return false; | |
609 | } | |
610 | ||
611 | /* kernel equivalent to IP_ADD_MEMBERSHIP */ | |
612 | static int vxlan_join_group(struct net_device *dev) | |
613 | { | |
614 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
615 | struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id); | |
616 | struct sock *sk = vn->sock->sk; | |
617 | struct ip_mreqn mreq = { | |
af9b078e YB |
618 | .imr_multiaddr.s_addr = vxlan->gaddr, |
619 | .imr_ifindex = vxlan->link, | |
d342894c | 620 | }; |
621 | int err; | |
622 | ||
623 | /* Already a member of group */ | |
624 | if (vxlan_group_used(vn, vxlan)) | |
625 | return 0; | |
626 | ||
627 | /* Need to drop RTNL to call multicast join */ | |
628 | rtnl_unlock(); | |
629 | lock_sock(sk); | |
630 | err = ip_mc_join_group(sk, &mreq); | |
631 | release_sock(sk); | |
632 | rtnl_lock(); | |
633 | ||
634 | return err; | |
635 | } | |
636 | ||
637 | ||
638 | /* kernel equivalent to IP_DROP_MEMBERSHIP */ | |
639 | static int vxlan_leave_group(struct net_device *dev) | |
640 | { | |
641 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
642 | struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id); | |
643 | int err = 0; | |
644 | struct sock *sk = vn->sock->sk; | |
645 | struct ip_mreqn mreq = { | |
af9b078e YB |
646 | .imr_multiaddr.s_addr = vxlan->gaddr, |
647 | .imr_ifindex = vxlan->link, | |
d342894c | 648 | }; |
649 | ||
650 | /* Only leave group when last vxlan is done. */ | |
651 | if (vxlan_group_used(vn, vxlan)) | |
652 | return 0; | |
653 | ||
654 | /* Need to drop RTNL to call multicast leave */ | |
655 | rtnl_unlock(); | |
656 | lock_sock(sk); | |
657 | err = ip_mc_leave_group(sk, &mreq); | |
658 | release_sock(sk); | |
659 | rtnl_lock(); | |
660 | ||
661 | return err; | |
662 | } | |
663 | ||
664 | /* Callback from net/ipv4/udp.c to receive packets */ | |
665 | static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb) | |
666 | { | |
667 | struct iphdr *oip; | |
668 | struct vxlanhdr *vxh; | |
669 | struct vxlan_dev *vxlan; | |
670 | struct vxlan_stats *stats; | |
671 | __u32 vni; | |
672 | int err; | |
673 | ||
674 | /* pop off outer UDP header */ | |
675 | __skb_pull(skb, sizeof(struct udphdr)); | |
676 | ||
677 | /* Need Vxlan and inner Ethernet header to be present */ | |
678 | if (!pskb_may_pull(skb, sizeof(struct vxlanhdr))) | |
679 | goto error; | |
680 | ||
681 | /* Drop packets with reserved bits set */ | |
682 | vxh = (struct vxlanhdr *) skb->data; | |
683 | if (vxh->vx_flags != htonl(VXLAN_FLAGS) || | |
684 | (vxh->vx_vni & htonl(0xff))) { | |
685 | netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n", | |
686 | ntohl(vxh->vx_flags), ntohl(vxh->vx_vni)); | |
687 | goto error; | |
688 | } | |
689 | ||
690 | __skb_pull(skb, sizeof(struct vxlanhdr)); | |
d342894c | 691 | |
692 | /* Is this VNI defined? */ | |
693 | vni = ntohl(vxh->vx_vni) >> 8; | |
694 | vxlan = vxlan_find_vni(sock_net(sk), vni); | |
695 | if (!vxlan) { | |
696 | netdev_dbg(skb->dev, "unknown vni %d\n", vni); | |
697 | goto drop; | |
698 | } | |
699 | ||
700 | if (!pskb_may_pull(skb, ETH_HLEN)) { | |
701 | vxlan->dev->stats.rx_length_errors++; | |
702 | vxlan->dev->stats.rx_errors++; | |
703 | goto drop; | |
704 | } | |
705 | ||
e4f67add DS |
706 | skb_reset_mac_header(skb); |
707 | ||
d342894c | 708 | /* Re-examine inner Ethernet packet */ |
709 | oip = ip_hdr(skb); | |
710 | skb->protocol = eth_type_trans(skb, vxlan->dev); | |
d342894c | 711 | |
712 | /* Ignore packet loops (and multicast echo) */ | |
713 | if (compare_ether_addr(eth_hdr(skb)->h_source, | |
714 | vxlan->dev->dev_addr) == 0) | |
715 | goto drop; | |
716 | ||
e4f67add | 717 | if (vxlan->flags & VXLAN_F_LEARN) |
d342894c | 718 | vxlan_snoop(skb->dev, oip->saddr, eth_hdr(skb)->h_source); |
719 | ||
720 | __skb_tunnel_rx(skb, vxlan->dev); | |
721 | skb_reset_network_header(skb); | |
0afb1666 JG |
722 | |
723 | /* If the NIC driver gave us an encapsulated packet with | |
724 | * CHECKSUM_UNNECESSARY and Rx checksum feature is enabled, | |
725 | * leave the CHECKSUM_UNNECESSARY, the device checksummed it | |
726 | * for us. Otherwise force the upper layers to verify it. | |
727 | */ | |
728 | if (skb->ip_summed != CHECKSUM_UNNECESSARY || !skb->encapsulation || | |
729 | !(vxlan->dev->features & NETIF_F_RXCSUM)) | |
730 | skb->ip_summed = CHECKSUM_NONE; | |
731 | ||
732 | skb->encapsulation = 0; | |
d342894c | 733 | |
734 | err = IP_ECN_decapsulate(oip, skb); | |
735 | if (unlikely(err)) { | |
736 | if (log_ecn_error) | |
737 | net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", | |
738 | &oip->saddr, oip->tos); | |
739 | if (err > 1) { | |
740 | ++vxlan->dev->stats.rx_frame_errors; | |
741 | ++vxlan->dev->stats.rx_errors; | |
742 | goto drop; | |
743 | } | |
744 | } | |
745 | ||
746 | stats = this_cpu_ptr(vxlan->stats); | |
747 | u64_stats_update_begin(&stats->syncp); | |
748 | stats->rx_packets++; | |
749 | stats->rx_bytes += skb->len; | |
750 | u64_stats_update_end(&stats->syncp); | |
751 | ||
752 | netif_rx(skb); | |
753 | ||
754 | return 0; | |
755 | error: | |
756 | /* Put UDP header back */ | |
757 | __skb_push(skb, sizeof(struct udphdr)); | |
758 | ||
759 | return 1; | |
760 | drop: | |
761 | /* Consume bad packet */ | |
762 | kfree_skb(skb); | |
763 | return 0; | |
764 | } | |
765 | ||
e4f67add DS |
766 | static int arp_reduce(struct net_device *dev, struct sk_buff *skb) |
767 | { | |
768 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
769 | struct arphdr *parp; | |
770 | u8 *arpptr, *sha; | |
771 | __be32 sip, tip; | |
772 | struct neighbour *n; | |
773 | ||
774 | if (dev->flags & IFF_NOARP) | |
775 | goto out; | |
776 | ||
777 | if (!pskb_may_pull(skb, arp_hdr_len(dev))) { | |
778 | dev->stats.tx_dropped++; | |
779 | goto out; | |
780 | } | |
781 | parp = arp_hdr(skb); | |
782 | ||
783 | if ((parp->ar_hrd != htons(ARPHRD_ETHER) && | |
784 | parp->ar_hrd != htons(ARPHRD_IEEE802)) || | |
785 | parp->ar_pro != htons(ETH_P_IP) || | |
786 | parp->ar_op != htons(ARPOP_REQUEST) || | |
787 | parp->ar_hln != dev->addr_len || | |
788 | parp->ar_pln != 4) | |
789 | goto out; | |
790 | arpptr = (u8 *)parp + sizeof(struct arphdr); | |
791 | sha = arpptr; | |
792 | arpptr += dev->addr_len; /* sha */ | |
793 | memcpy(&sip, arpptr, sizeof(sip)); | |
794 | arpptr += sizeof(sip); | |
795 | arpptr += dev->addr_len; /* tha */ | |
796 | memcpy(&tip, arpptr, sizeof(tip)); | |
797 | ||
798 | if (ipv4_is_loopback(tip) || | |
799 | ipv4_is_multicast(tip)) | |
800 | goto out; | |
801 | ||
802 | n = neigh_lookup(&arp_tbl, &tip, dev); | |
803 | ||
804 | if (n) { | |
805 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
806 | struct vxlan_fdb *f; | |
807 | struct sk_buff *reply; | |
808 | ||
809 | if (!(n->nud_state & NUD_CONNECTED)) { | |
810 | neigh_release(n); | |
811 | goto out; | |
812 | } | |
813 | ||
814 | f = vxlan_find_mac(vxlan, n->ha); | |
6681712d | 815 | if (f && f->remote.remote_ip == htonl(INADDR_ANY)) { |
e4f67add DS |
816 | /* bridge-local neighbor */ |
817 | neigh_release(n); | |
818 | goto out; | |
819 | } | |
820 | ||
821 | reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha, | |
822 | n->ha, sha); | |
823 | ||
824 | neigh_release(n); | |
825 | ||
826 | skb_reset_mac_header(reply); | |
827 | __skb_pull(reply, skb_network_offset(reply)); | |
828 | reply->ip_summed = CHECKSUM_UNNECESSARY; | |
829 | reply->pkt_type = PACKET_HOST; | |
830 | ||
831 | if (netif_rx_ni(reply) == NET_RX_DROP) | |
832 | dev->stats.rx_dropped++; | |
833 | } else if (vxlan->flags & VXLAN_F_L3MISS) | |
834 | vxlan_ip_miss(dev, tip); | |
835 | out: | |
836 | consume_skb(skb); | |
837 | return NETDEV_TX_OK; | |
838 | } | |
839 | ||
840 | static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb) | |
841 | { | |
842 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
843 | struct neighbour *n; | |
844 | struct iphdr *pip; | |
845 | ||
846 | if (is_multicast_ether_addr(eth_hdr(skb)->h_dest)) | |
847 | return false; | |
848 | ||
849 | n = NULL; | |
850 | switch (ntohs(eth_hdr(skb)->h_proto)) { | |
851 | case ETH_P_IP: | |
852 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
853 | return false; | |
854 | pip = ip_hdr(skb); | |
855 | n = neigh_lookup(&arp_tbl, &pip->daddr, dev); | |
856 | break; | |
857 | default: | |
858 | return false; | |
859 | } | |
860 | ||
861 | if (n) { | |
862 | bool diff; | |
863 | ||
864 | diff = compare_ether_addr(eth_hdr(skb)->h_dest, n->ha) != 0; | |
865 | if (diff) { | |
866 | memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest, | |
867 | dev->addr_len); | |
868 | memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len); | |
869 | } | |
870 | neigh_release(n); | |
871 | return diff; | |
872 | } else if (vxlan->flags & VXLAN_F_L3MISS) | |
873 | vxlan_ip_miss(dev, pip->daddr); | |
874 | return false; | |
875 | } | |
876 | ||
d342894c | 877 | /* Extract dsfield from inner protocol */ |
878 | static inline u8 vxlan_get_dsfield(const struct iphdr *iph, | |
879 | const struct sk_buff *skb) | |
880 | { | |
881 | if (skb->protocol == htons(ETH_P_IP)) | |
882 | return iph->tos; | |
883 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
884 | return ipv6_get_dsfield((const struct ipv6hdr *)iph); | |
885 | else | |
886 | return 0; | |
887 | } | |
888 | ||
889 | /* Propogate ECN bits out */ | |
890 | static inline u8 vxlan_ecn_encap(u8 tos, | |
891 | const struct iphdr *iph, | |
892 | const struct sk_buff *skb) | |
893 | { | |
894 | u8 inner = vxlan_get_dsfield(iph, skb); | |
895 | ||
896 | return INET_ECN_encapsulate(tos, inner); | |
897 | } | |
898 | ||
1cad8715 | 899 | static void vxlan_sock_free(struct sk_buff *skb) |
900 | { | |
901 | sock_put(skb->sk); | |
902 | } | |
903 | ||
904 | /* On transmit, associate with the tunnel socket */ | |
905 | static void vxlan_set_owner(struct net_device *dev, struct sk_buff *skb) | |
906 | { | |
907 | struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id); | |
908 | struct sock *sk = vn->sock->sk; | |
909 | ||
910 | skb_orphan(skb); | |
911 | sock_hold(sk); | |
912 | skb->sk = sk; | |
913 | skb->destructor = vxlan_sock_free; | |
914 | } | |
915 | ||
05f47d69 | 916 | /* Compute source port for outgoing packet |
917 | * first choice to use L4 flow hash since it will spread | |
918 | * better and maybe available from hardware | |
919 | * secondary choice is to use jhash on the Ethernet header | |
920 | */ | |
921 | static u16 vxlan_src_port(const struct vxlan_dev *vxlan, struct sk_buff *skb) | |
922 | { | |
923 | unsigned int range = (vxlan->port_max - vxlan->port_min) + 1; | |
924 | u32 hash; | |
925 | ||
926 | hash = skb_get_rxhash(skb); | |
927 | if (!hash) | |
928 | hash = jhash(skb->data, 2 * ETH_ALEN, | |
929 | (__force u32) skb->protocol); | |
930 | ||
931 | return (((u64) hash * range) >> 32) + vxlan->port_min; | |
932 | } | |
933 | ||
05c0db08 PS |
934 | static int handle_offloads(struct sk_buff *skb) |
935 | { | |
936 | if (skb_is_gso(skb)) { | |
937 | int err = skb_unclone(skb, GFP_ATOMIC); | |
938 | if (unlikely(err)) | |
939 | return err; | |
940 | ||
941 | skb_shinfo(skb)->gso_type |= (SKB_GSO_UDP_TUNNEL | SKB_GSO_UDP); | |
942 | } else if (skb->ip_summed != CHECKSUM_PARTIAL) | |
943 | skb->ip_summed = CHECKSUM_NONE; | |
944 | ||
945 | return 0; | |
946 | } | |
947 | ||
6681712d DS |
948 | static netdev_tx_t vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev, |
949 | struct vxlan_rdst *rdst, bool did_rsc) | |
d342894c | 950 | { |
951 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
952 | struct rtable *rt; | |
d342894c | 953 | const struct iphdr *old_iph; |
954 | struct iphdr *iph; | |
955 | struct vxlanhdr *vxh; | |
956 | struct udphdr *uh; | |
957 | struct flowi4 fl4; | |
d342894c | 958 | unsigned int pkt_len = skb->len; |
d342894c | 959 | __be32 dst; |
6681712d DS |
960 | __u16 src_port, dst_port; |
961 | u32 vni; | |
d342894c | 962 | __be16 df = 0; |
963 | __u8 tos, ttl; | |
d342894c | 964 | |
6681712d DS |
965 | dst_port = rdst->remote_port ? rdst->remote_port : vxlan_port; |
966 | vni = rdst->remote_vni; | |
967 | dst = rdst->remote_ip; | |
e4f67add DS |
968 | |
969 | if (!dst) { | |
970 | if (did_rsc) { | |
971 | __skb_pull(skb, skb_network_offset(skb)); | |
972 | skb->ip_summed = CHECKSUM_NONE; | |
973 | skb->pkt_type = PACKET_HOST; | |
974 | ||
975 | /* short-circuited back to local bridge */ | |
976 | if (netif_rx(skb) == NET_RX_SUCCESS) { | |
977 | struct vxlan_stats *stats = | |
978 | this_cpu_ptr(vxlan->stats); | |
979 | ||
980 | u64_stats_update_begin(&stats->syncp); | |
981 | stats->tx_packets++; | |
982 | stats->tx_bytes += pkt_len; | |
983 | u64_stats_update_end(&stats->syncp); | |
984 | } else { | |
985 | dev->stats.tx_errors++; | |
986 | dev->stats.tx_aborted_errors++; | |
987 | } | |
988 | return NETDEV_TX_OK; | |
989 | } | |
ef59febe | 990 | goto drop; |
e4f67add | 991 | } |
ef59febe | 992 | |
d6727fe3 JG |
993 | if (!skb->encapsulation) { |
994 | skb_reset_inner_headers(skb); | |
995 | skb->encapsulation = 1; | |
996 | } | |
997 | ||
d342894c | 998 | /* Need space for new headers (invalidates iph ptr) */ |
999 | if (skb_cow_head(skb, VXLAN_HEADROOM)) | |
1000 | goto drop; | |
1001 | ||
d342894c | 1002 | old_iph = ip_hdr(skb); |
1003 | ||
d342894c | 1004 | ttl = vxlan->ttl; |
1005 | if (!ttl && IN_MULTICAST(ntohl(dst))) | |
1006 | ttl = 1; | |
1007 | ||
1008 | tos = vxlan->tos; | |
1009 | if (tos == 1) | |
1010 | tos = vxlan_get_dsfield(old_iph, skb); | |
1011 | ||
05f47d69 | 1012 | src_port = vxlan_src_port(vxlan, skb); |
d342894c | 1013 | |
ca78f181 | 1014 | memset(&fl4, 0, sizeof(fl4)); |
6681712d | 1015 | fl4.flowi4_oif = rdst->remote_ifindex; |
ca78f181 | 1016 | fl4.flowi4_tos = RT_TOS(tos); |
1017 | fl4.daddr = dst; | |
1018 | fl4.saddr = vxlan->saddr; | |
1019 | ||
1020 | rt = ip_route_output_key(dev_net(dev), &fl4); | |
d342894c | 1021 | if (IS_ERR(rt)) { |
1022 | netdev_dbg(dev, "no route to %pI4\n", &dst); | |
1023 | dev->stats.tx_carrier_errors++; | |
1024 | goto tx_error; | |
1025 | } | |
1026 | ||
1027 | if (rt->dst.dev == dev) { | |
1028 | netdev_dbg(dev, "circular route to %pI4\n", &dst); | |
1029 | ip_rt_put(rt); | |
1030 | dev->stats.collisions++; | |
1031 | goto tx_error; | |
1032 | } | |
1033 | ||
1034 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); | |
1035 | IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED | | |
1036 | IPSKB_REROUTED); | |
1037 | skb_dst_drop(skb); | |
1038 | skb_dst_set(skb, &rt->dst); | |
1039 | ||
1040 | vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh)); | |
1041 | vxh->vx_flags = htonl(VXLAN_FLAGS); | |
6681712d | 1042 | vxh->vx_vni = htonl(vni << 8); |
d342894c | 1043 | |
1044 | __skb_push(skb, sizeof(*uh)); | |
1045 | skb_reset_transport_header(skb); | |
1046 | uh = udp_hdr(skb); | |
1047 | ||
6681712d | 1048 | uh->dest = htons(dst_port); |
05f47d69 | 1049 | uh->source = htons(src_port); |
d342894c | 1050 | |
1051 | uh->len = htons(skb->len); | |
1052 | uh->check = 0; | |
1053 | ||
1054 | __skb_push(skb, sizeof(*iph)); | |
1055 | skb_reset_network_header(skb); | |
1056 | iph = ip_hdr(skb); | |
1057 | iph->version = 4; | |
1058 | iph->ihl = sizeof(struct iphdr) >> 2; | |
1059 | iph->frag_off = df; | |
1060 | iph->protocol = IPPROTO_UDP; | |
1061 | iph->tos = vxlan_ecn_encap(tos, old_iph, skb); | |
ca78f181 | 1062 | iph->daddr = dst; |
d342894c | 1063 | iph->saddr = fl4.saddr; |
1064 | iph->ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); | |
8dc98eb2 | 1065 | tunnel_ip_select_ident(skb, old_iph, &rt->dst); |
d342894c | 1066 | |
88c4c066 ZM |
1067 | nf_reset(skb); |
1068 | ||
1cad8715 | 1069 | vxlan_set_owner(dev, skb); |
1070 | ||
05c0db08 PS |
1071 | if (handle_offloads(skb)) |
1072 | goto drop; | |
d342894c | 1073 | |
6aed0c8b | 1074 | iptunnel_xmit(skb, dev); |
d342894c | 1075 | return NETDEV_TX_OK; |
1076 | ||
1077 | drop: | |
1078 | dev->stats.tx_dropped++; | |
1079 | goto tx_free; | |
1080 | ||
1081 | tx_error: | |
1082 | dev->stats.tx_errors++; | |
1083 | tx_free: | |
1084 | dev_kfree_skb(skb); | |
1085 | return NETDEV_TX_OK; | |
1086 | } | |
1087 | ||
6681712d DS |
1088 | /* Transmit local packets over Vxlan |
1089 | * | |
1090 | * Outer IP header inherits ECN and DF from inner header. | |
1091 | * Outer UDP destination is the VXLAN assigned port. | |
1092 | * source port is based on hash of flow | |
1093 | */ | |
1094 | static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev) | |
1095 | { | |
1096 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1097 | struct ethhdr *eth; | |
1098 | bool did_rsc = false; | |
1099 | struct vxlan_rdst group, *rdst0, *rdst; | |
1100 | struct vxlan_fdb *f; | |
1101 | int rc1, rc; | |
1102 | ||
1103 | skb_reset_mac_header(skb); | |
1104 | eth = eth_hdr(skb); | |
1105 | ||
1106 | if ((vxlan->flags & VXLAN_F_PROXY) && ntohs(eth->h_proto) == ETH_P_ARP) | |
1107 | return arp_reduce(dev, skb); | |
1108 | else if ((vxlan->flags&VXLAN_F_RSC) && ntohs(eth->h_proto) == ETH_P_IP) | |
1109 | did_rsc = route_shortcircuit(dev, skb); | |
1110 | ||
1111 | f = vxlan_find_mac(vxlan, eth->h_dest); | |
1112 | if (f == NULL) { | |
1113 | did_rsc = false; | |
1114 | group.remote_port = vxlan_port; | |
1115 | group.remote_vni = vxlan->vni; | |
1116 | group.remote_ip = vxlan->gaddr; | |
1117 | group.remote_ifindex = vxlan->link; | |
1118 | group.remote_next = 0; | |
1119 | rdst0 = &group; | |
1120 | ||
1121 | if (group.remote_ip == htonl(INADDR_ANY) && | |
1122 | (vxlan->flags & VXLAN_F_L2MISS) && | |
1123 | !is_multicast_ether_addr(eth->h_dest)) | |
1124 | vxlan_fdb_miss(vxlan, eth->h_dest); | |
1125 | } else | |
1126 | rdst0 = &f->remote; | |
1127 | ||
1128 | rc = NETDEV_TX_OK; | |
1129 | ||
1130 | /* if there are multiple destinations, send copies */ | |
1131 | for (rdst = rdst0->remote_next; rdst; rdst = rdst->remote_next) { | |
1132 | struct sk_buff *skb1; | |
1133 | ||
1134 | skb1 = skb_clone(skb, GFP_ATOMIC); | |
1135 | rc1 = vxlan_xmit_one(skb1, dev, rdst, did_rsc); | |
1136 | if (rc == NETDEV_TX_OK) | |
1137 | rc = rc1; | |
1138 | } | |
1139 | ||
1140 | rc1 = vxlan_xmit_one(skb, dev, rdst0, did_rsc); | |
1141 | if (rc == NETDEV_TX_OK) | |
1142 | rc = rc1; | |
1143 | return rc; | |
1144 | } | |
1145 | ||
d342894c | 1146 | /* Walk the forwarding table and purge stale entries */ |
1147 | static void vxlan_cleanup(unsigned long arg) | |
1148 | { | |
1149 | struct vxlan_dev *vxlan = (struct vxlan_dev *) arg; | |
1150 | unsigned long next_timer = jiffies + FDB_AGE_INTERVAL; | |
1151 | unsigned int h; | |
1152 | ||
1153 | if (!netif_running(vxlan->dev)) | |
1154 | return; | |
1155 | ||
1156 | spin_lock_bh(&vxlan->hash_lock); | |
1157 | for (h = 0; h < FDB_HASH_SIZE; ++h) { | |
1158 | struct hlist_node *p, *n; | |
1159 | hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) { | |
1160 | struct vxlan_fdb *f | |
1161 | = container_of(p, struct vxlan_fdb, hlist); | |
1162 | unsigned long timeout; | |
1163 | ||
3c172868 | 1164 | if (f->state & NUD_PERMANENT) |
d342894c | 1165 | continue; |
1166 | ||
1167 | timeout = f->used + vxlan->age_interval * HZ; | |
1168 | if (time_before_eq(timeout, jiffies)) { | |
1169 | netdev_dbg(vxlan->dev, | |
1170 | "garbage collect %pM\n", | |
1171 | f->eth_addr); | |
1172 | f->state = NUD_STALE; | |
1173 | vxlan_fdb_destroy(vxlan, f); | |
1174 | } else if (time_before(timeout, next_timer)) | |
1175 | next_timer = timeout; | |
1176 | } | |
1177 | } | |
1178 | spin_unlock_bh(&vxlan->hash_lock); | |
1179 | ||
1180 | mod_timer(&vxlan->age_timer, next_timer); | |
1181 | } | |
1182 | ||
1183 | /* Setup stats when device is created */ | |
1184 | static int vxlan_init(struct net_device *dev) | |
1185 | { | |
1186 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1187 | ||
1188 | vxlan->stats = alloc_percpu(struct vxlan_stats); | |
1189 | if (!vxlan->stats) | |
1190 | return -ENOMEM; | |
1191 | ||
1192 | return 0; | |
1193 | } | |
1194 | ||
1195 | /* Start ageing timer and join group when device is brought up */ | |
1196 | static int vxlan_open(struct net_device *dev) | |
1197 | { | |
1198 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1199 | int err; | |
1200 | ||
1201 | if (vxlan->gaddr) { | |
1202 | err = vxlan_join_group(dev); | |
1203 | if (err) | |
1204 | return err; | |
1205 | } | |
1206 | ||
1207 | if (vxlan->age_interval) | |
1208 | mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL); | |
1209 | ||
1210 | return 0; | |
1211 | } | |
1212 | ||
1213 | /* Purge the forwarding table */ | |
1214 | static void vxlan_flush(struct vxlan_dev *vxlan) | |
1215 | { | |
1216 | unsigned h; | |
1217 | ||
1218 | spin_lock_bh(&vxlan->hash_lock); | |
1219 | for (h = 0; h < FDB_HASH_SIZE; ++h) { | |
1220 | struct hlist_node *p, *n; | |
1221 | hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) { | |
1222 | struct vxlan_fdb *f | |
1223 | = container_of(p, struct vxlan_fdb, hlist); | |
1224 | vxlan_fdb_destroy(vxlan, f); | |
1225 | } | |
1226 | } | |
1227 | spin_unlock_bh(&vxlan->hash_lock); | |
1228 | } | |
1229 | ||
1230 | /* Cleanup timer and forwarding table on shutdown */ | |
1231 | static int vxlan_stop(struct net_device *dev) | |
1232 | { | |
1233 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1234 | ||
1235 | if (vxlan->gaddr) | |
1236 | vxlan_leave_group(dev); | |
1237 | ||
1238 | del_timer_sync(&vxlan->age_timer); | |
1239 | ||
1240 | vxlan_flush(vxlan); | |
1241 | ||
1242 | return 0; | |
1243 | } | |
1244 | ||
1245 | /* Merge per-cpu statistics */ | |
1246 | static struct rtnl_link_stats64 *vxlan_stats64(struct net_device *dev, | |
1247 | struct rtnl_link_stats64 *stats) | |
1248 | { | |
1249 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1250 | struct vxlan_stats tmp, sum = { 0 }; | |
1251 | unsigned int cpu; | |
1252 | ||
1253 | for_each_possible_cpu(cpu) { | |
1254 | unsigned int start; | |
1255 | const struct vxlan_stats *stats | |
1256 | = per_cpu_ptr(vxlan->stats, cpu); | |
1257 | ||
1258 | do { | |
1259 | start = u64_stats_fetch_begin_bh(&stats->syncp); | |
1260 | memcpy(&tmp, stats, sizeof(tmp)); | |
1261 | } while (u64_stats_fetch_retry_bh(&stats->syncp, start)); | |
1262 | ||
1263 | sum.tx_bytes += tmp.tx_bytes; | |
1264 | sum.tx_packets += tmp.tx_packets; | |
1265 | sum.rx_bytes += tmp.rx_bytes; | |
1266 | sum.rx_packets += tmp.rx_packets; | |
1267 | } | |
1268 | ||
1269 | stats->tx_bytes = sum.tx_bytes; | |
1270 | stats->tx_packets = sum.tx_packets; | |
1271 | stats->rx_bytes = sum.rx_bytes; | |
1272 | stats->rx_packets = sum.rx_packets; | |
1273 | ||
1274 | stats->multicast = dev->stats.multicast; | |
1275 | stats->rx_length_errors = dev->stats.rx_length_errors; | |
1276 | stats->rx_frame_errors = dev->stats.rx_frame_errors; | |
1277 | stats->rx_errors = dev->stats.rx_errors; | |
1278 | ||
1279 | stats->tx_dropped = dev->stats.tx_dropped; | |
1280 | stats->tx_carrier_errors = dev->stats.tx_carrier_errors; | |
1281 | stats->tx_aborted_errors = dev->stats.tx_aborted_errors; | |
1282 | stats->collisions = dev->stats.collisions; | |
1283 | stats->tx_errors = dev->stats.tx_errors; | |
1284 | ||
1285 | return stats; | |
1286 | } | |
1287 | ||
1288 | /* Stub, nothing needs to be done. */ | |
1289 | static void vxlan_set_multicast_list(struct net_device *dev) | |
1290 | { | |
1291 | } | |
1292 | ||
1293 | static const struct net_device_ops vxlan_netdev_ops = { | |
1294 | .ndo_init = vxlan_init, | |
1295 | .ndo_open = vxlan_open, | |
1296 | .ndo_stop = vxlan_stop, | |
1297 | .ndo_start_xmit = vxlan_xmit, | |
1298 | .ndo_get_stats64 = vxlan_stats64, | |
1299 | .ndo_set_rx_mode = vxlan_set_multicast_list, | |
1300 | .ndo_change_mtu = eth_change_mtu, | |
1301 | .ndo_validate_addr = eth_validate_addr, | |
1302 | .ndo_set_mac_address = eth_mac_addr, | |
1303 | .ndo_fdb_add = vxlan_fdb_add, | |
1304 | .ndo_fdb_del = vxlan_fdb_delete, | |
1305 | .ndo_fdb_dump = vxlan_fdb_dump, | |
1306 | }; | |
1307 | ||
1308 | /* Info for udev, that this is a virtual tunnel endpoint */ | |
1309 | static struct device_type vxlan_type = { | |
1310 | .name = "vxlan", | |
1311 | }; | |
1312 | ||
1313 | static void vxlan_free(struct net_device *dev) | |
1314 | { | |
1315 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1316 | ||
1317 | free_percpu(vxlan->stats); | |
1318 | free_netdev(dev); | |
1319 | } | |
1320 | ||
1321 | /* Initialize the device structure. */ | |
1322 | static void vxlan_setup(struct net_device *dev) | |
1323 | { | |
1324 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1325 | unsigned h; | |
05f47d69 | 1326 | int low, high; |
d342894c | 1327 | |
1328 | eth_hw_addr_random(dev); | |
1329 | ether_setup(dev); | |
2840bf22 | 1330 | dev->hard_header_len = ETH_HLEN + VXLAN_HEADROOM; |
d342894c | 1331 | |
1332 | dev->netdev_ops = &vxlan_netdev_ops; | |
1333 | dev->destructor = vxlan_free; | |
1334 | SET_NETDEV_DEVTYPE(dev, &vxlan_type); | |
1335 | ||
1336 | dev->tx_queue_len = 0; | |
1337 | dev->features |= NETIF_F_LLTX; | |
1338 | dev->features |= NETIF_F_NETNS_LOCAL; | |
d6727fe3 | 1339 | dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM; |
0afb1666 | 1340 | dev->features |= NETIF_F_RXCSUM; |
05c0db08 | 1341 | dev->features |= NETIF_F_GSO_SOFTWARE; |
0afb1666 JG |
1342 | |
1343 | dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM; | |
05c0db08 | 1344 | dev->hw_features |= NETIF_F_GSO_SOFTWARE; |
d342894c | 1345 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
6602d007 | 1346 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
d342894c | 1347 | |
1348 | spin_lock_init(&vxlan->hash_lock); | |
1349 | ||
1350 | init_timer_deferrable(&vxlan->age_timer); | |
1351 | vxlan->age_timer.function = vxlan_cleanup; | |
1352 | vxlan->age_timer.data = (unsigned long) vxlan; | |
1353 | ||
05f47d69 | 1354 | inet_get_local_port_range(&low, &high); |
1355 | vxlan->port_min = low; | |
1356 | vxlan->port_max = high; | |
1357 | ||
d342894c | 1358 | vxlan->dev = dev; |
1359 | ||
1360 | for (h = 0; h < FDB_HASH_SIZE; ++h) | |
1361 | INIT_HLIST_HEAD(&vxlan->fdb_head[h]); | |
1362 | } | |
1363 | ||
1364 | static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = { | |
1365 | [IFLA_VXLAN_ID] = { .type = NLA_U32 }, | |
1366 | [IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) }, | |
1367 | [IFLA_VXLAN_LINK] = { .type = NLA_U32 }, | |
1368 | [IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) }, | |
1369 | [IFLA_VXLAN_TOS] = { .type = NLA_U8 }, | |
1370 | [IFLA_VXLAN_TTL] = { .type = NLA_U8 }, | |
1371 | [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 }, | |
1372 | [IFLA_VXLAN_AGEING] = { .type = NLA_U32 }, | |
1373 | [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 }, | |
05f47d69 | 1374 | [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) }, |
e4f67add DS |
1375 | [IFLA_VXLAN_PROXY] = { .type = NLA_U8 }, |
1376 | [IFLA_VXLAN_RSC] = { .type = NLA_U8 }, | |
1377 | [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 }, | |
1378 | [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 }, | |
d342894c | 1379 | }; |
1380 | ||
1381 | static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[]) | |
1382 | { | |
1383 | if (tb[IFLA_ADDRESS]) { | |
1384 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { | |
1385 | pr_debug("invalid link address (not ethernet)\n"); | |
1386 | return -EINVAL; | |
1387 | } | |
1388 | ||
1389 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { | |
1390 | pr_debug("invalid all zero ethernet address\n"); | |
1391 | return -EADDRNOTAVAIL; | |
1392 | } | |
1393 | } | |
1394 | ||
1395 | if (!data) | |
1396 | return -EINVAL; | |
1397 | ||
1398 | if (data[IFLA_VXLAN_ID]) { | |
1399 | __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]); | |
1400 | if (id >= VXLAN_VID_MASK) | |
1401 | return -ERANGE; | |
1402 | } | |
1403 | ||
1404 | if (data[IFLA_VXLAN_GROUP]) { | |
1405 | __be32 gaddr = nla_get_be32(data[IFLA_VXLAN_GROUP]); | |
1406 | if (!IN_MULTICAST(ntohl(gaddr))) { | |
1407 | pr_debug("group address is not IPv4 multicast\n"); | |
1408 | return -EADDRNOTAVAIL; | |
1409 | } | |
1410 | } | |
05f47d69 | 1411 | |
1412 | if (data[IFLA_VXLAN_PORT_RANGE]) { | |
1413 | const struct ifla_vxlan_port_range *p | |
1414 | = nla_data(data[IFLA_VXLAN_PORT_RANGE]); | |
1415 | ||
1416 | if (ntohs(p->high) < ntohs(p->low)) { | |
1417 | pr_debug("port range %u .. %u not valid\n", | |
1418 | ntohs(p->low), ntohs(p->high)); | |
1419 | return -EINVAL; | |
1420 | } | |
1421 | } | |
1422 | ||
d342894c | 1423 | return 0; |
1424 | } | |
1425 | ||
1b13c97f YB |
1426 | static void vxlan_get_drvinfo(struct net_device *netdev, |
1427 | struct ethtool_drvinfo *drvinfo) | |
1428 | { | |
1429 | strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version)); | |
1430 | strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver)); | |
1431 | } | |
1432 | ||
1433 | static const struct ethtool_ops vxlan_ethtool_ops = { | |
1434 | .get_drvinfo = vxlan_get_drvinfo, | |
1435 | .get_link = ethtool_op_get_link, | |
1436 | }; | |
1437 | ||
d342894c | 1438 | static int vxlan_newlink(struct net *net, struct net_device *dev, |
1439 | struct nlattr *tb[], struct nlattr *data[]) | |
1440 | { | |
1441 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1442 | __u32 vni; | |
1443 | int err; | |
1444 | ||
1445 | if (!data[IFLA_VXLAN_ID]) | |
1446 | return -EINVAL; | |
1447 | ||
1448 | vni = nla_get_u32(data[IFLA_VXLAN_ID]); | |
1449 | if (vxlan_find_vni(net, vni)) { | |
1450 | pr_info("duplicate VNI %u\n", vni); | |
1451 | return -EEXIST; | |
1452 | } | |
1453 | vxlan->vni = vni; | |
1454 | ||
1455 | if (data[IFLA_VXLAN_GROUP]) | |
1456 | vxlan->gaddr = nla_get_be32(data[IFLA_VXLAN_GROUP]); | |
1457 | ||
1458 | if (data[IFLA_VXLAN_LOCAL]) | |
1459 | vxlan->saddr = nla_get_be32(data[IFLA_VXLAN_LOCAL]); | |
1460 | ||
34e02aa1 | 1461 | if (data[IFLA_VXLAN_LINK] && |
1462 | (vxlan->link = nla_get_u32(data[IFLA_VXLAN_LINK]))) { | |
1463 | struct net_device *lowerdev | |
1464 | = __dev_get_by_index(net, vxlan->link); | |
1465 | ||
1466 | if (!lowerdev) { | |
1467 | pr_info("ifindex %d does not exist\n", vxlan->link); | |
1468 | return -ENODEV; | |
1469 | } | |
d342894c | 1470 | |
34e02aa1 | 1471 | if (!tb[IFLA_MTU]) |
d342894c | 1472 | dev->mtu = lowerdev->mtu - VXLAN_HEADROOM; |
1ba56fb4 AD |
1473 | |
1474 | /* update header length based on lower device */ | |
1475 | dev->hard_header_len = lowerdev->hard_header_len + | |
1476 | VXLAN_HEADROOM; | |
d342894c | 1477 | } |
1478 | ||
1479 | if (data[IFLA_VXLAN_TOS]) | |
1480 | vxlan->tos = nla_get_u8(data[IFLA_VXLAN_TOS]); | |
1481 | ||
afb97186 VB |
1482 | if (data[IFLA_VXLAN_TTL]) |
1483 | vxlan->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]); | |
1484 | ||
d342894c | 1485 | if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING])) |
e4f67add | 1486 | vxlan->flags |= VXLAN_F_LEARN; |
d342894c | 1487 | |
1488 | if (data[IFLA_VXLAN_AGEING]) | |
1489 | vxlan->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]); | |
1490 | else | |
1491 | vxlan->age_interval = FDB_AGE_DEFAULT; | |
1492 | ||
e4f67add DS |
1493 | if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY])) |
1494 | vxlan->flags |= VXLAN_F_PROXY; | |
1495 | ||
1496 | if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC])) | |
1497 | vxlan->flags |= VXLAN_F_RSC; | |
1498 | ||
1499 | if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS])) | |
1500 | vxlan->flags |= VXLAN_F_L2MISS; | |
1501 | ||
1502 | if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS])) | |
1503 | vxlan->flags |= VXLAN_F_L3MISS; | |
1504 | ||
d342894c | 1505 | if (data[IFLA_VXLAN_LIMIT]) |
1506 | vxlan->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]); | |
1507 | ||
05f47d69 | 1508 | if (data[IFLA_VXLAN_PORT_RANGE]) { |
1509 | const struct ifla_vxlan_port_range *p | |
1510 | = nla_data(data[IFLA_VXLAN_PORT_RANGE]); | |
1511 | vxlan->port_min = ntohs(p->low); | |
1512 | vxlan->port_max = ntohs(p->high); | |
1513 | } | |
1514 | ||
1b13c97f YB |
1515 | SET_ETHTOOL_OPS(dev, &vxlan_ethtool_ops); |
1516 | ||
d342894c | 1517 | err = register_netdevice(dev); |
1518 | if (!err) | |
1519 | hlist_add_head_rcu(&vxlan->hlist, vni_head(net, vxlan->vni)); | |
1520 | ||
1521 | return err; | |
1522 | } | |
1523 | ||
1524 | static void vxlan_dellink(struct net_device *dev, struct list_head *head) | |
1525 | { | |
1526 | struct vxlan_dev *vxlan = netdev_priv(dev); | |
1527 | ||
1528 | hlist_del_rcu(&vxlan->hlist); | |
1529 | ||
1530 | unregister_netdevice_queue(dev, head); | |
1531 | } | |
1532 | ||
1533 | static size_t vxlan_get_size(const struct net_device *dev) | |
1534 | { | |
1535 | ||
1536 | return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */ | |
1537 | nla_total_size(sizeof(__be32)) +/* IFLA_VXLAN_GROUP */ | |
1538 | nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */ | |
1539 | nla_total_size(sizeof(__be32))+ /* IFLA_VXLAN_LOCAL */ | |
1540 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */ | |
1541 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */ | |
1542 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */ | |
e4f67add DS |
1543 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */ |
1544 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */ | |
1545 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */ | |
1546 | nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */ | |
d342894c | 1547 | nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */ |
1548 | nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */ | |
05f47d69 | 1549 | nla_total_size(sizeof(struct ifla_vxlan_port_range)) + |
d342894c | 1550 | 0; |
1551 | } | |
1552 | ||
1553 | static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
1554 | { | |
1555 | const struct vxlan_dev *vxlan = netdev_priv(dev); | |
05f47d69 | 1556 | struct ifla_vxlan_port_range ports = { |
1557 | .low = htons(vxlan->port_min), | |
1558 | .high = htons(vxlan->port_max), | |
1559 | }; | |
d342894c | 1560 | |
1561 | if (nla_put_u32(skb, IFLA_VXLAN_ID, vxlan->vni)) | |
1562 | goto nla_put_failure; | |
1563 | ||
7c41c42c | 1564 | if (vxlan->gaddr && nla_put_be32(skb, IFLA_VXLAN_GROUP, vxlan->gaddr)) |
d342894c | 1565 | goto nla_put_failure; |
1566 | ||
1567 | if (vxlan->link && nla_put_u32(skb, IFLA_VXLAN_LINK, vxlan->link)) | |
1568 | goto nla_put_failure; | |
1569 | ||
7c41c42c | 1570 | if (vxlan->saddr && nla_put_be32(skb, IFLA_VXLAN_LOCAL, vxlan->saddr)) |
d342894c | 1571 | goto nla_put_failure; |
1572 | ||
1573 | if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->ttl) || | |
1574 | nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->tos) || | |
e4f67add DS |
1575 | nla_put_u8(skb, IFLA_VXLAN_LEARNING, |
1576 | !!(vxlan->flags & VXLAN_F_LEARN)) || | |
1577 | nla_put_u8(skb, IFLA_VXLAN_PROXY, | |
1578 | !!(vxlan->flags & VXLAN_F_PROXY)) || | |
1579 | nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) || | |
1580 | nla_put_u8(skb, IFLA_VXLAN_L2MISS, | |
1581 | !!(vxlan->flags & VXLAN_F_L2MISS)) || | |
1582 | nla_put_u8(skb, IFLA_VXLAN_L3MISS, | |
1583 | !!(vxlan->flags & VXLAN_F_L3MISS)) || | |
d342894c | 1584 | nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->age_interval) || |
1585 | nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->addrmax)) | |
1586 | goto nla_put_failure; | |
1587 | ||
05f47d69 | 1588 | if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports)) |
1589 | goto nla_put_failure; | |
1590 | ||
d342894c | 1591 | return 0; |
1592 | ||
1593 | nla_put_failure: | |
1594 | return -EMSGSIZE; | |
1595 | } | |
1596 | ||
1597 | static struct rtnl_link_ops vxlan_link_ops __read_mostly = { | |
1598 | .kind = "vxlan", | |
1599 | .maxtype = IFLA_VXLAN_MAX, | |
1600 | .policy = vxlan_policy, | |
1601 | .priv_size = sizeof(struct vxlan_dev), | |
1602 | .setup = vxlan_setup, | |
1603 | .validate = vxlan_validate, | |
1604 | .newlink = vxlan_newlink, | |
1605 | .dellink = vxlan_dellink, | |
1606 | .get_size = vxlan_get_size, | |
1607 | .fill_info = vxlan_fill_info, | |
1608 | }; | |
1609 | ||
1610 | static __net_init int vxlan_init_net(struct net *net) | |
1611 | { | |
1612 | struct vxlan_net *vn = net_generic(net, vxlan_net_id); | |
1613 | struct sock *sk; | |
1614 | struct sockaddr_in vxlan_addr = { | |
1615 | .sin_family = AF_INET, | |
1616 | .sin_addr.s_addr = htonl(INADDR_ANY), | |
1617 | }; | |
1618 | int rc; | |
1619 | unsigned h; | |
1620 | ||
1621 | /* Create UDP socket for encapsulation receive. */ | |
1622 | rc = sock_create_kern(AF_INET, SOCK_DGRAM, IPPROTO_UDP, &vn->sock); | |
1623 | if (rc < 0) { | |
1624 | pr_debug("UDP socket create failed\n"); | |
1625 | return rc; | |
1626 | } | |
bfe1b9b1 | 1627 | /* Put in proper namespace */ |
1628 | sk = vn->sock->sk; | |
1629 | sk_change_net(sk, net); | |
d342894c | 1630 | |
1631 | vxlan_addr.sin_port = htons(vxlan_port); | |
1632 | ||
1633 | rc = kernel_bind(vn->sock, (struct sockaddr *) &vxlan_addr, | |
1634 | sizeof(vxlan_addr)); | |
1635 | if (rc < 0) { | |
1636 | pr_debug("bind for UDP socket %pI4:%u (%d)\n", | |
1637 | &vxlan_addr.sin_addr, ntohs(vxlan_addr.sin_port), rc); | |
bfe1b9b1 | 1638 | sk_release_kernel(sk); |
d342894c | 1639 | vn->sock = NULL; |
1640 | return rc; | |
1641 | } | |
1642 | ||
1643 | /* Disable multicast loopback */ | |
d342894c | 1644 | inet_sk(sk)->mc_loop = 0; |
1645 | ||
1646 | /* Mark socket as an encapsulation socket. */ | |
1647 | udp_sk(sk)->encap_type = 1; | |
1648 | udp_sk(sk)->encap_rcv = vxlan_udp_encap_recv; | |
1649 | udp_encap_enable(); | |
1650 | ||
1651 | for (h = 0; h < VNI_HASH_SIZE; ++h) | |
1652 | INIT_HLIST_HEAD(&vn->vni_list[h]); | |
1653 | ||
1654 | return 0; | |
1655 | } | |
1656 | ||
1657 | static __net_exit void vxlan_exit_net(struct net *net) | |
1658 | { | |
1659 | struct vxlan_net *vn = net_generic(net, vxlan_net_id); | |
9cb6cb7e ZM |
1660 | struct vxlan_dev *vxlan; |
1661 | unsigned h; | |
1662 | ||
1663 | rtnl_lock(); | |
1664 | for (h = 0; h < VNI_HASH_SIZE; ++h) | |
1665 | hlist_for_each_entry(vxlan, &vn->vni_list[h], hlist) | |
1666 | dev_close(vxlan->dev); | |
1667 | rtnl_unlock(); | |
d342894c | 1668 | |
1669 | if (vn->sock) { | |
bfe1b9b1 | 1670 | sk_release_kernel(vn->sock->sk); |
d342894c | 1671 | vn->sock = NULL; |
1672 | } | |
1673 | } | |
1674 | ||
1675 | static struct pernet_operations vxlan_net_ops = { | |
1676 | .init = vxlan_init_net, | |
1677 | .exit = vxlan_exit_net, | |
1678 | .id = &vxlan_net_id, | |
1679 | .size = sizeof(struct vxlan_net), | |
1680 | }; | |
1681 | ||
1682 | static int __init vxlan_init_module(void) | |
1683 | { | |
1684 | int rc; | |
1685 | ||
1686 | get_random_bytes(&vxlan_salt, sizeof(vxlan_salt)); | |
1687 | ||
1688 | rc = register_pernet_device(&vxlan_net_ops); | |
1689 | if (rc) | |
1690 | goto out1; | |
1691 | ||
1692 | rc = rtnl_link_register(&vxlan_link_ops); | |
1693 | if (rc) | |
1694 | goto out2; | |
1695 | ||
1696 | return 0; | |
1697 | ||
1698 | out2: | |
1699 | unregister_pernet_device(&vxlan_net_ops); | |
1700 | out1: | |
1701 | return rc; | |
1702 | } | |
1703 | module_init(vxlan_init_module); | |
1704 | ||
1705 | static void __exit vxlan_cleanup_module(void) | |
1706 | { | |
1707 | rtnl_link_unregister(&vxlan_link_ops); | |
1708 | unregister_pernet_device(&vxlan_net_ops); | |
6681712d | 1709 | rcu_barrier(); |
d342894c | 1710 | } |
1711 | module_exit(vxlan_cleanup_module); | |
1712 | ||
1713 | MODULE_LICENSE("GPL"); | |
1714 | MODULE_VERSION(VXLAN_VERSION); | |
1715 | MODULE_AUTHOR("Stephen Hemminger <shemminger@vyatta.com>"); | |
1716 | MODULE_ALIAS_RTNL_LINK("vxlan"); |