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c5441932 PS |
1 | /* |
2 | * Copyright (c) 2013 Nicira, Inc. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of version 2 of the GNU General Public | |
6 | * License as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but | |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License | |
14 | * along with this program; if not, write to the Free Software | |
15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
16 | * 02110-1301, USA | |
17 | */ | |
18 | ||
19 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
20 | ||
21 | #include <linux/capability.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/types.h> | |
24 | #include <linux/kernel.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/uaccess.h> | |
27 | #include <linux/skbuff.h> | |
28 | #include <linux/netdevice.h> | |
29 | #include <linux/in.h> | |
30 | #include <linux/tcp.h> | |
31 | #include <linux/udp.h> | |
32 | #include <linux/if_arp.h> | |
c5441932 PS |
33 | #include <linux/init.h> |
34 | #include <linux/in6.h> | |
35 | #include <linux/inetdevice.h> | |
36 | #include <linux/igmp.h> | |
37 | #include <linux/netfilter_ipv4.h> | |
38 | #include <linux/etherdevice.h> | |
39 | #include <linux/if_ether.h> | |
40 | #include <linux/if_vlan.h> | |
41 | #include <linux/rculist.h> | |
27d79f3b | 42 | #include <linux/err.h> |
c5441932 PS |
43 | |
44 | #include <net/sock.h> | |
45 | #include <net/ip.h> | |
46 | #include <net/icmp.h> | |
47 | #include <net/protocol.h> | |
48 | #include <net/ip_tunnels.h> | |
49 | #include <net/arp.h> | |
50 | #include <net/checksum.h> | |
51 | #include <net/dsfield.h> | |
52 | #include <net/inet_ecn.h> | |
53 | #include <net/xfrm.h> | |
54 | #include <net/net_namespace.h> | |
55 | #include <net/netns/generic.h> | |
56 | #include <net/rtnetlink.h> | |
56328486 | 57 | #include <net/udp.h> |
cfc7381b | 58 | #include <net/dst_metadata.h> |
63487bab | 59 | |
c5441932 PS |
60 | #if IS_ENABLED(CONFIG_IPV6) |
61 | #include <net/ipv6.h> | |
62 | #include <net/ip6_fib.h> | |
63 | #include <net/ip6_route.h> | |
64 | #endif | |
65 | ||
967680e0 | 66 | static unsigned int ip_tunnel_hash(__be32 key, __be32 remote) |
c5441932 PS |
67 | { |
68 | return hash_32((__force u32)key ^ (__force u32)remote, | |
69 | IP_TNL_HASH_BITS); | |
70 | } | |
71 | ||
c5441932 PS |
72 | static bool ip_tunnel_key_match(const struct ip_tunnel_parm *p, |
73 | __be16 flags, __be32 key) | |
74 | { | |
75 | if (p->i_flags & TUNNEL_KEY) { | |
76 | if (flags & TUNNEL_KEY) | |
77 | return key == p->i_key; | |
78 | else | |
79 | /* key expected, none present */ | |
80 | return false; | |
81 | } else | |
82 | return !(flags & TUNNEL_KEY); | |
83 | } | |
84 | ||
85 | /* Fallback tunnel: no source, no destination, no key, no options | |
86 | ||
87 | Tunnel hash table: | |
88 | We require exact key match i.e. if a key is present in packet | |
89 | it will match only tunnel with the same key; if it is not present, | |
90 | it will match only keyless tunnel. | |
91 | ||
92 | All keysless packets, if not matched configured keyless tunnels | |
93 | will match fallback tunnel. | |
94 | Given src, dst and key, find appropriate for input tunnel. | |
95 | */ | |
96 | struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn, | |
97 | int link, __be16 flags, | |
98 | __be32 remote, __be32 local, | |
99 | __be32 key) | |
100 | { | |
101 | unsigned int hash; | |
102 | struct ip_tunnel *t, *cand = NULL; | |
103 | struct hlist_head *head; | |
104 | ||
967680e0 | 105 | hash = ip_tunnel_hash(key, remote); |
c5441932 PS |
106 | head = &itn->tunnels[hash]; |
107 | ||
108 | hlist_for_each_entry_rcu(t, head, hash_node) { | |
109 | if (local != t->parms.iph.saddr || | |
110 | remote != t->parms.iph.daddr || | |
111 | !(t->dev->flags & IFF_UP)) | |
112 | continue; | |
113 | ||
114 | if (!ip_tunnel_key_match(&t->parms, flags, key)) | |
115 | continue; | |
116 | ||
117 | if (t->parms.link == link) | |
118 | return t; | |
119 | else | |
120 | cand = t; | |
121 | } | |
122 | ||
123 | hlist_for_each_entry_rcu(t, head, hash_node) { | |
124 | if (remote != t->parms.iph.daddr || | |
e0056593 | 125 | t->parms.iph.saddr != 0 || |
c5441932 PS |
126 | !(t->dev->flags & IFF_UP)) |
127 | continue; | |
128 | ||
129 | if (!ip_tunnel_key_match(&t->parms, flags, key)) | |
130 | continue; | |
131 | ||
132 | if (t->parms.link == link) | |
133 | return t; | |
134 | else if (!cand) | |
135 | cand = t; | |
136 | } | |
137 | ||
967680e0 | 138 | hash = ip_tunnel_hash(key, 0); |
c5441932 PS |
139 | head = &itn->tunnels[hash]; |
140 | ||
141 | hlist_for_each_entry_rcu(t, head, hash_node) { | |
e0056593 DP |
142 | if ((local != t->parms.iph.saddr || t->parms.iph.daddr != 0) && |
143 | (local != t->parms.iph.daddr || !ipv4_is_multicast(local))) | |
144 | continue; | |
145 | ||
146 | if (!(t->dev->flags & IFF_UP)) | |
c5441932 PS |
147 | continue; |
148 | ||
149 | if (!ip_tunnel_key_match(&t->parms, flags, key)) | |
150 | continue; | |
151 | ||
152 | if (t->parms.link == link) | |
153 | return t; | |
154 | else if (!cand) | |
155 | cand = t; | |
156 | } | |
157 | ||
158 | if (flags & TUNNEL_NO_KEY) | |
159 | goto skip_key_lookup; | |
160 | ||
161 | hlist_for_each_entry_rcu(t, head, hash_node) { | |
162 | if (t->parms.i_key != key || | |
e0056593 DP |
163 | t->parms.iph.saddr != 0 || |
164 | t->parms.iph.daddr != 0 || | |
c5441932 PS |
165 | !(t->dev->flags & IFF_UP)) |
166 | continue; | |
167 | ||
168 | if (t->parms.link == link) | |
169 | return t; | |
170 | else if (!cand) | |
171 | cand = t; | |
172 | } | |
173 | ||
174 | skip_key_lookup: | |
175 | if (cand) | |
176 | return cand; | |
177 | ||
2e15ea39 PS |
178 | t = rcu_dereference(itn->collect_md_tun); |
179 | if (t) | |
180 | return t; | |
181 | ||
c5441932 PS |
182 | if (itn->fb_tunnel_dev && itn->fb_tunnel_dev->flags & IFF_UP) |
183 | return netdev_priv(itn->fb_tunnel_dev); | |
184 | ||
c5441932 PS |
185 | return NULL; |
186 | } | |
187 | EXPORT_SYMBOL_GPL(ip_tunnel_lookup); | |
188 | ||
189 | static struct hlist_head *ip_bucket(struct ip_tunnel_net *itn, | |
190 | struct ip_tunnel_parm *parms) | |
191 | { | |
192 | unsigned int h; | |
193 | __be32 remote; | |
6d608f06 | 194 | __be32 i_key = parms->i_key; |
c5441932 PS |
195 | |
196 | if (parms->iph.daddr && !ipv4_is_multicast(parms->iph.daddr)) | |
197 | remote = parms->iph.daddr; | |
198 | else | |
199 | remote = 0; | |
200 | ||
6d608f06 SK |
201 | if (!(parms->i_flags & TUNNEL_KEY) && (parms->i_flags & VTI_ISVTI)) |
202 | i_key = 0; | |
203 | ||
204 | h = ip_tunnel_hash(i_key, remote); | |
c5441932 PS |
205 | return &itn->tunnels[h]; |
206 | } | |
207 | ||
208 | static void ip_tunnel_add(struct ip_tunnel_net *itn, struct ip_tunnel *t) | |
209 | { | |
210 | struct hlist_head *head = ip_bucket(itn, &t->parms); | |
211 | ||
2e15ea39 PS |
212 | if (t->collect_md) |
213 | rcu_assign_pointer(itn->collect_md_tun, t); | |
c5441932 PS |
214 | hlist_add_head_rcu(&t->hash_node, head); |
215 | } | |
216 | ||
2e15ea39 | 217 | static void ip_tunnel_del(struct ip_tunnel_net *itn, struct ip_tunnel *t) |
c5441932 | 218 | { |
2e15ea39 PS |
219 | if (t->collect_md) |
220 | rcu_assign_pointer(itn->collect_md_tun, NULL); | |
c5441932 PS |
221 | hlist_del_init_rcu(&t->hash_node); |
222 | } | |
223 | ||
224 | static struct ip_tunnel *ip_tunnel_find(struct ip_tunnel_net *itn, | |
225 | struct ip_tunnel_parm *parms, | |
226 | int type) | |
227 | { | |
228 | __be32 remote = parms->iph.daddr; | |
229 | __be32 local = parms->iph.saddr; | |
230 | __be32 key = parms->i_key; | |
5ce54af1 | 231 | __be16 flags = parms->i_flags; |
c5441932 PS |
232 | int link = parms->link; |
233 | struct ip_tunnel *t = NULL; | |
234 | struct hlist_head *head = ip_bucket(itn, parms); | |
235 | ||
236 | hlist_for_each_entry_rcu(t, head, hash_node) { | |
237 | if (local == t->parms.iph.saddr && | |
238 | remote == t->parms.iph.daddr && | |
c5441932 | 239 | link == t->parms.link && |
5ce54af1 DP |
240 | type == t->dev->type && |
241 | ip_tunnel_key_match(&t->parms, flags, key)) | |
c5441932 PS |
242 | break; |
243 | } | |
244 | return t; | |
245 | } | |
246 | ||
247 | static struct net_device *__ip_tunnel_create(struct net *net, | |
248 | const struct rtnl_link_ops *ops, | |
249 | struct ip_tunnel_parm *parms) | |
250 | { | |
251 | int err; | |
252 | struct ip_tunnel *tunnel; | |
253 | struct net_device *dev; | |
254 | char name[IFNAMSIZ]; | |
255 | ||
256 | if (parms->name[0]) | |
257 | strlcpy(name, parms->name, IFNAMSIZ); | |
258 | else { | |
54a5d382 | 259 | if (strlen(ops->kind) > (IFNAMSIZ - 3)) { |
c5441932 PS |
260 | err = -E2BIG; |
261 | goto failed; | |
262 | } | |
263 | strlcpy(name, ops->kind, IFNAMSIZ); | |
264 | strncat(name, "%d", 2); | |
265 | } | |
266 | ||
267 | ASSERT_RTNL(); | |
c835a677 | 268 | dev = alloc_netdev(ops->priv_size, name, NET_NAME_UNKNOWN, ops->setup); |
c5441932 PS |
269 | if (!dev) { |
270 | err = -ENOMEM; | |
271 | goto failed; | |
272 | } | |
273 | dev_net_set(dev, net); | |
274 | ||
275 | dev->rtnl_link_ops = ops; | |
276 | ||
277 | tunnel = netdev_priv(dev); | |
278 | tunnel->parms = *parms; | |
5e6700b3 | 279 | tunnel->net = net; |
c5441932 PS |
280 | |
281 | err = register_netdevice(dev); | |
282 | if (err) | |
283 | goto failed_free; | |
284 | ||
285 | return dev; | |
286 | ||
287 | failed_free: | |
288 | free_netdev(dev); | |
289 | failed: | |
290 | return ERR_PTR(err); | |
291 | } | |
292 | ||
7d442fab TH |
293 | static inline void init_tunnel_flow(struct flowi4 *fl4, |
294 | int proto, | |
295 | __be32 daddr, __be32 saddr, | |
296 | __be32 key, __u8 tos, int oif) | |
c5441932 PS |
297 | { |
298 | memset(fl4, 0, sizeof(*fl4)); | |
299 | fl4->flowi4_oif = oif; | |
300 | fl4->daddr = daddr; | |
301 | fl4->saddr = saddr; | |
302 | fl4->flowi4_tos = tos; | |
303 | fl4->flowi4_proto = proto; | |
304 | fl4->fl4_gre_key = key; | |
c5441932 PS |
305 | } |
306 | ||
307 | static int ip_tunnel_bind_dev(struct net_device *dev) | |
308 | { | |
309 | struct net_device *tdev = NULL; | |
310 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
311 | const struct iphdr *iph; | |
312 | int hlen = LL_MAX_HEADER; | |
313 | int mtu = ETH_DATA_LEN; | |
314 | int t_hlen = tunnel->hlen + sizeof(struct iphdr); | |
315 | ||
316 | iph = &tunnel->parms.iph; | |
317 | ||
318 | /* Guess output device to choose reasonable mtu and needed_headroom */ | |
319 | if (iph->daddr) { | |
320 | struct flowi4 fl4; | |
321 | struct rtable *rt; | |
322 | ||
7d442fab TH |
323 | init_tunnel_flow(&fl4, iph->protocol, iph->daddr, |
324 | iph->saddr, tunnel->parms.o_key, | |
325 | RT_TOS(iph->tos), tunnel->parms.link); | |
326 | rt = ip_route_output_key(tunnel->net, &fl4); | |
327 | ||
c5441932 PS |
328 | if (!IS_ERR(rt)) { |
329 | tdev = rt->dst.dev; | |
330 | ip_rt_put(rt); | |
331 | } | |
332 | if (dev->type != ARPHRD_ETHER) | |
333 | dev->flags |= IFF_POINTOPOINT; | |
f27337e1 PA |
334 | |
335 | dst_cache_reset(&tunnel->dst_cache); | |
c5441932 PS |
336 | } |
337 | ||
338 | if (!tdev && tunnel->parms.link) | |
6c742e71 | 339 | tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link); |
c5441932 PS |
340 | |
341 | if (tdev) { | |
342 | hlen = tdev->hard_header_len + tdev->needed_headroom; | |
343 | mtu = tdev->mtu; | |
344 | } | |
c5441932 PS |
345 | |
346 | dev->needed_headroom = t_hlen + hlen; | |
347 | mtu -= (dev->hard_header_len + t_hlen); | |
348 | ||
349 | if (mtu < 68) | |
350 | mtu = 68; | |
351 | ||
352 | return mtu; | |
353 | } | |
354 | ||
355 | static struct ip_tunnel *ip_tunnel_create(struct net *net, | |
356 | struct ip_tunnel_net *itn, | |
357 | struct ip_tunnel_parm *parms) | |
358 | { | |
4929fd8c | 359 | struct ip_tunnel *nt; |
c5441932 | 360 | struct net_device *dev; |
b96f9afe | 361 | int t_hlen; |
c5441932 PS |
362 | |
363 | BUG_ON(!itn->fb_tunnel_dev); | |
c5441932 PS |
364 | dev = __ip_tunnel_create(net, itn->fb_tunnel_dev->rtnl_link_ops, parms); |
365 | if (IS_ERR(dev)) | |
6dd3c9ec | 366 | return ERR_CAST(dev); |
c5441932 PS |
367 | |
368 | dev->mtu = ip_tunnel_bind_dev(dev); | |
369 | ||
370 | nt = netdev_priv(dev); | |
b96f9afe JW |
371 | t_hlen = nt->hlen + sizeof(struct iphdr); |
372 | dev->min_mtu = ETH_MIN_MTU; | |
373 | dev->max_mtu = 0xFFF8 - dev->hard_header_len - t_hlen; | |
c5441932 PS |
374 | ip_tunnel_add(itn, nt); |
375 | return nt; | |
376 | } | |
377 | ||
378 | int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb, | |
2e15ea39 PS |
379 | const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst, |
380 | bool log_ecn_error) | |
c5441932 | 381 | { |
8f84985f | 382 | struct pcpu_sw_netstats *tstats; |
c5441932 PS |
383 | const struct iphdr *iph = ip_hdr(skb); |
384 | int err; | |
385 | ||
c5441932 PS |
386 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
387 | if (ipv4_is_multicast(iph->daddr)) { | |
c5441932 PS |
388 | tunnel->dev->stats.multicast++; |
389 | skb->pkt_type = PACKET_BROADCAST; | |
390 | } | |
391 | #endif | |
392 | ||
393 | if ((!(tpi->flags&TUNNEL_CSUM) && (tunnel->parms.i_flags&TUNNEL_CSUM)) || | |
394 | ((tpi->flags&TUNNEL_CSUM) && !(tunnel->parms.i_flags&TUNNEL_CSUM))) { | |
395 | tunnel->dev->stats.rx_crc_errors++; | |
396 | tunnel->dev->stats.rx_errors++; | |
397 | goto drop; | |
398 | } | |
399 | ||
400 | if (tunnel->parms.i_flags&TUNNEL_SEQ) { | |
401 | if (!(tpi->flags&TUNNEL_SEQ) || | |
402 | (tunnel->i_seqno && (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) { | |
403 | tunnel->dev->stats.rx_fifo_errors++; | |
404 | tunnel->dev->stats.rx_errors++; | |
405 | goto drop; | |
406 | } | |
407 | tunnel->i_seqno = ntohl(tpi->seq) + 1; | |
408 | } | |
409 | ||
e96f2e7c YC |
410 | skb_reset_network_header(skb); |
411 | ||
c5441932 PS |
412 | err = IP_ECN_decapsulate(iph, skb); |
413 | if (unlikely(err)) { | |
414 | if (log_ecn_error) | |
415 | net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", | |
416 | &iph->saddr, iph->tos); | |
417 | if (err > 1) { | |
418 | ++tunnel->dev->stats.rx_frame_errors; | |
419 | ++tunnel->dev->stats.rx_errors; | |
420 | goto drop; | |
421 | } | |
422 | } | |
423 | ||
424 | tstats = this_cpu_ptr(tunnel->dev->tstats); | |
425 | u64_stats_update_begin(&tstats->syncp); | |
426 | tstats->rx_packets++; | |
427 | tstats->rx_bytes += skb->len; | |
428 | u64_stats_update_end(&tstats->syncp); | |
429 | ||
81b9eab5 AS |
430 | skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev))); |
431 | ||
3d7b46cd PS |
432 | if (tunnel->dev->type == ARPHRD_ETHER) { |
433 | skb->protocol = eth_type_trans(skb, tunnel->dev); | |
434 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); | |
435 | } else { | |
436 | skb->dev = tunnel->dev; | |
437 | } | |
64261f23 | 438 | |
2e15ea39 PS |
439 | if (tun_dst) |
440 | skb_dst_set(skb, (struct dst_entry *)tun_dst); | |
441 | ||
c5441932 PS |
442 | gro_cells_receive(&tunnel->gro_cells, skb); |
443 | return 0; | |
444 | ||
445 | drop: | |
446 | kfree_skb(skb); | |
447 | return 0; | |
448 | } | |
449 | EXPORT_SYMBOL_GPL(ip_tunnel_rcv); | |
450 | ||
a8c5f90f TH |
451 | int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *ops, |
452 | unsigned int num) | |
453 | { | |
bb1553c8 TG |
454 | if (num >= MAX_IPTUN_ENCAP_OPS) |
455 | return -ERANGE; | |
456 | ||
a8c5f90f TH |
457 | return !cmpxchg((const struct ip_tunnel_encap_ops **) |
458 | &iptun_encaps[num], | |
459 | NULL, ops) ? 0 : -1; | |
56328486 | 460 | } |
a8c5f90f TH |
461 | EXPORT_SYMBOL(ip_tunnel_encap_add_ops); |
462 | ||
463 | int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *ops, | |
464 | unsigned int num) | |
465 | { | |
466 | int ret; | |
467 | ||
bb1553c8 TG |
468 | if (num >= MAX_IPTUN_ENCAP_OPS) |
469 | return -ERANGE; | |
470 | ||
a8c5f90f TH |
471 | ret = (cmpxchg((const struct ip_tunnel_encap_ops **) |
472 | &iptun_encaps[num], | |
473 | ops, NULL) == ops) ? 0 : -1; | |
474 | ||
475 | synchronize_net(); | |
476 | ||
477 | return ret; | |
478 | } | |
479 | EXPORT_SYMBOL(ip_tunnel_encap_del_ops); | |
56328486 TH |
480 | |
481 | int ip_tunnel_encap_setup(struct ip_tunnel *t, | |
482 | struct ip_tunnel_encap *ipencap) | |
483 | { | |
484 | int hlen; | |
485 | ||
486 | memset(&t->encap, 0, sizeof(t->encap)); | |
487 | ||
488 | hlen = ip_encap_hlen(ipencap); | |
489 | if (hlen < 0) | |
490 | return hlen; | |
491 | ||
492 | t->encap.type = ipencap->type; | |
493 | t->encap.sport = ipencap->sport; | |
494 | t->encap.dport = ipencap->dport; | |
495 | t->encap.flags = ipencap->flags; | |
496 | ||
497 | t->encap_hlen = hlen; | |
498 | t->hlen = t->encap_hlen + t->tun_hlen; | |
499 | ||
500 | return 0; | |
501 | } | |
502 | EXPORT_SYMBOL_GPL(ip_tunnel_encap_setup); | |
503 | ||
23a3647b | 504 | static int tnl_update_pmtu(struct net_device *dev, struct sk_buff *skb, |
fc24f2b2 TT |
505 | struct rtable *rt, __be16 df, |
506 | const struct iphdr *inner_iph) | |
23a3647b PS |
507 | { |
508 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
8c91e162 | 509 | int pkt_size = skb->len - tunnel->hlen - dev->hard_header_len; |
23a3647b PS |
510 | int mtu; |
511 | ||
512 | if (df) | |
513 | mtu = dst_mtu(&rt->dst) - dev->hard_header_len | |
514 | - sizeof(struct iphdr) - tunnel->hlen; | |
515 | else | |
516 | mtu = skb_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu; | |
517 | ||
518 | if (skb_dst(skb)) | |
519 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); | |
520 | ||
521 | if (skb->protocol == htons(ETH_P_IP)) { | |
522 | if (!skb_is_gso(skb) && | |
fc24f2b2 TT |
523 | (inner_iph->frag_off & htons(IP_DF)) && |
524 | mtu < pkt_size) { | |
23a3647b PS |
525 | memset(IPCB(skb), 0, sizeof(*IPCB(skb))); |
526 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); | |
527 | return -E2BIG; | |
528 | } | |
529 | } | |
530 | #if IS_ENABLED(CONFIG_IPV6) | |
531 | else if (skb->protocol == htons(ETH_P_IPV6)) { | |
532 | struct rt6_info *rt6 = (struct rt6_info *)skb_dst(skb); | |
533 | ||
534 | if (rt6 && mtu < dst_mtu(skb_dst(skb)) && | |
535 | mtu >= IPV6_MIN_MTU) { | |
536 | if ((tunnel->parms.iph.daddr && | |
537 | !ipv4_is_multicast(tunnel->parms.iph.daddr)) || | |
538 | rt6->rt6i_dst.plen == 128) { | |
539 | rt6->rt6i_flags |= RTF_MODIFIED; | |
540 | dst_metric_set(skb_dst(skb), RTAX_MTU, mtu); | |
541 | } | |
542 | } | |
543 | ||
544 | if (!skb_is_gso(skb) && mtu >= IPV6_MIN_MTU && | |
545 | mtu < pkt_size) { | |
546 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); | |
547 | return -E2BIG; | |
548 | } | |
549 | } | |
550 | #endif | |
551 | return 0; | |
552 | } | |
553 | ||
cfc7381b AS |
554 | void ip_md_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, u8 proto) |
555 | { | |
556 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
557 | u32 headroom = sizeof(struct iphdr); | |
558 | struct ip_tunnel_info *tun_info; | |
559 | const struct ip_tunnel_key *key; | |
560 | const struct iphdr *inner_iph; | |
561 | struct rtable *rt; | |
562 | struct flowi4 fl4; | |
563 | __be16 df = 0; | |
564 | u8 tos, ttl; | |
565 | ||
566 | tun_info = skb_tunnel_info(skb); | |
567 | if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) || | |
568 | ip_tunnel_info_af(tun_info) != AF_INET)) | |
569 | goto tx_error; | |
570 | key = &tun_info->key; | |
571 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); | |
572 | inner_iph = (const struct iphdr *)skb_inner_network_header(skb); | |
573 | tos = key->tos; | |
574 | if (tos == 1) { | |
575 | if (skb->protocol == htons(ETH_P_IP)) | |
576 | tos = inner_iph->tos; | |
577 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
578 | tos = ipv6_get_dsfield((const struct ipv6hdr *)inner_iph); | |
579 | } | |
580 | init_tunnel_flow(&fl4, proto, key->u.ipv4.dst, key->u.ipv4.src, 0, | |
581 | RT_TOS(tos), tunnel->parms.link); | |
582 | if (tunnel->encap.type != TUNNEL_ENCAP_NONE) | |
583 | goto tx_error; | |
584 | rt = ip_route_output_key(tunnel->net, &fl4); | |
585 | if (IS_ERR(rt)) { | |
586 | dev->stats.tx_carrier_errors++; | |
587 | goto tx_error; | |
588 | } | |
589 | if (rt->dst.dev == dev) { | |
590 | ip_rt_put(rt); | |
591 | dev->stats.collisions++; | |
592 | goto tx_error; | |
593 | } | |
594 | tos = ip_tunnel_ecn_encap(tos, inner_iph, skb); | |
595 | ttl = key->ttl; | |
596 | if (ttl == 0) { | |
597 | if (skb->protocol == htons(ETH_P_IP)) | |
598 | ttl = inner_iph->ttl; | |
599 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
600 | ttl = ((const struct ipv6hdr *)inner_iph)->hop_limit; | |
601 | else | |
602 | ttl = ip4_dst_hoplimit(&rt->dst); | |
603 | } | |
604 | if (key->tun_flags & TUNNEL_DONT_FRAGMENT) | |
605 | df = htons(IP_DF); | |
606 | else if (skb->protocol == htons(ETH_P_IP)) | |
607 | df = inner_iph->frag_off & htons(IP_DF); | |
608 | headroom += LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len; | |
609 | if (headroom > dev->needed_headroom) | |
610 | dev->needed_headroom = headroom; | |
611 | ||
612 | if (skb_cow_head(skb, dev->needed_headroom)) { | |
613 | ip_rt_put(rt); | |
614 | goto tx_dropped; | |
615 | } | |
616 | iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, proto, key->tos, | |
617 | key->ttl, df, !net_eq(tunnel->net, dev_net(dev))); | |
618 | return; | |
619 | tx_error: | |
620 | dev->stats.tx_errors++; | |
621 | goto kfree; | |
622 | tx_dropped: | |
623 | dev->stats.tx_dropped++; | |
624 | kfree: | |
625 | kfree_skb(skb); | |
626 | } | |
627 | EXPORT_SYMBOL_GPL(ip_md_tunnel_xmit); | |
628 | ||
c5441932 | 629 | void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, |
56328486 | 630 | const struct iphdr *tnl_params, u8 protocol) |
c5441932 PS |
631 | { |
632 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
633 | const struct iphdr *inner_iph; | |
c5441932 PS |
634 | struct flowi4 fl4; |
635 | u8 tos, ttl; | |
636 | __be16 df; | |
b045d37b | 637 | struct rtable *rt; /* Route to the other host */ |
c5441932 PS |
638 | unsigned int max_headroom; /* The extra header space needed */ |
639 | __be32 dst; | |
22fb22ea | 640 | bool connected; |
c5441932 PS |
641 | |
642 | inner_iph = (const struct iphdr *)skb_inner_network_header(skb); | |
22fb22ea | 643 | connected = (tunnel->parms.iph.daddr != 0); |
c5441932 | 644 | |
5146d1f1 BH |
645 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
646 | ||
c5441932 PS |
647 | dst = tnl_params->daddr; |
648 | if (dst == 0) { | |
649 | /* NBMA tunnel */ | |
650 | ||
51456b29 | 651 | if (!skb_dst(skb)) { |
c5441932 PS |
652 | dev->stats.tx_fifo_errors++; |
653 | goto tx_error; | |
654 | } | |
655 | ||
656 | if (skb->protocol == htons(ETH_P_IP)) { | |
657 | rt = skb_rtable(skb); | |
658 | dst = rt_nexthop(rt, inner_iph->daddr); | |
659 | } | |
660 | #if IS_ENABLED(CONFIG_IPV6) | |
661 | else if (skb->protocol == htons(ETH_P_IPV6)) { | |
662 | const struct in6_addr *addr6; | |
663 | struct neighbour *neigh; | |
664 | bool do_tx_error_icmp; | |
665 | int addr_type; | |
666 | ||
667 | neigh = dst_neigh_lookup(skb_dst(skb), | |
668 | &ipv6_hdr(skb)->daddr); | |
51456b29 | 669 | if (!neigh) |
c5441932 PS |
670 | goto tx_error; |
671 | ||
672 | addr6 = (const struct in6_addr *)&neigh->primary_key; | |
673 | addr_type = ipv6_addr_type(addr6); | |
674 | ||
675 | if (addr_type == IPV6_ADDR_ANY) { | |
676 | addr6 = &ipv6_hdr(skb)->daddr; | |
677 | addr_type = ipv6_addr_type(addr6); | |
678 | } | |
679 | ||
680 | if ((addr_type & IPV6_ADDR_COMPATv4) == 0) | |
681 | do_tx_error_icmp = true; | |
682 | else { | |
683 | do_tx_error_icmp = false; | |
684 | dst = addr6->s6_addr32[3]; | |
685 | } | |
686 | neigh_release(neigh); | |
687 | if (do_tx_error_icmp) | |
688 | goto tx_error_icmp; | |
689 | } | |
690 | #endif | |
691 | else | |
692 | goto tx_error; | |
7d442fab TH |
693 | |
694 | connected = false; | |
c5441932 PS |
695 | } |
696 | ||
697 | tos = tnl_params->tos; | |
698 | if (tos & 0x1) { | |
699 | tos &= ~0x1; | |
7d442fab | 700 | if (skb->protocol == htons(ETH_P_IP)) { |
c5441932 | 701 | tos = inner_iph->tos; |
7d442fab TH |
702 | connected = false; |
703 | } else if (skb->protocol == htons(ETH_P_IPV6)) { | |
c5441932 | 704 | tos = ipv6_get_dsfield((const struct ipv6hdr *)inner_iph); |
7d442fab TH |
705 | connected = false; |
706 | } | |
c5441932 PS |
707 | } |
708 | ||
7d442fab TH |
709 | init_tunnel_flow(&fl4, protocol, dst, tnl_params->saddr, |
710 | tunnel->parms.o_key, RT_TOS(tos), tunnel->parms.link); | |
711 | ||
56328486 TH |
712 | if (ip_tunnel_encap(skb, tunnel, &protocol, &fl4) < 0) |
713 | goto tx_error; | |
714 | ||
e09acddf PA |
715 | rt = connected ? dst_cache_get_ip4(&tunnel->dst_cache, &fl4.saddr) : |
716 | NULL; | |
7d442fab TH |
717 | |
718 | if (!rt) { | |
719 | rt = ip_route_output_key(tunnel->net, &fl4); | |
720 | ||
721 | if (IS_ERR(rt)) { | |
722 | dev->stats.tx_carrier_errors++; | |
723 | goto tx_error; | |
724 | } | |
725 | if (connected) | |
e09acddf PA |
726 | dst_cache_set_ip4(&tunnel->dst_cache, &rt->dst, |
727 | fl4.saddr); | |
c5441932 | 728 | } |
7d442fab | 729 | |
0e6fbc5b | 730 | if (rt->dst.dev == dev) { |
c5441932 PS |
731 | ip_rt_put(rt); |
732 | dev->stats.collisions++; | |
733 | goto tx_error; | |
734 | } | |
c5441932 | 735 | |
fc24f2b2 | 736 | if (tnl_update_pmtu(dev, skb, rt, tnl_params->frag_off, inner_iph)) { |
23a3647b PS |
737 | ip_rt_put(rt); |
738 | goto tx_error; | |
c5441932 | 739 | } |
c5441932 PS |
740 | |
741 | if (tunnel->err_count > 0) { | |
742 | if (time_before(jiffies, | |
743 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
744 | tunnel->err_count--; | |
745 | ||
746 | dst_link_failure(skb); | |
747 | } else | |
748 | tunnel->err_count = 0; | |
749 | } | |
750 | ||
d4a71b15 | 751 | tos = ip_tunnel_ecn_encap(tos, inner_iph, skb); |
c5441932 PS |
752 | ttl = tnl_params->ttl; |
753 | if (ttl == 0) { | |
754 | if (skb->protocol == htons(ETH_P_IP)) | |
755 | ttl = inner_iph->ttl; | |
756 | #if IS_ENABLED(CONFIG_IPV6) | |
757 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
758 | ttl = ((const struct ipv6hdr *)inner_iph)->hop_limit; | |
759 | #endif | |
760 | else | |
761 | ttl = ip4_dst_hoplimit(&rt->dst); | |
762 | } | |
763 | ||
23a3647b | 764 | df = tnl_params->frag_off; |
22a59be8 | 765 | if (skb->protocol == htons(ETH_P_IP) && !tunnel->ignore_df) |
23a3647b PS |
766 | df |= (inner_iph->frag_off&htons(IP_DF)); |
767 | ||
0e6fbc5b | 768 | max_headroom = LL_RESERVED_SPACE(rt->dst.dev) + sizeof(struct iphdr) |
7371e022 | 769 | + rt->dst.header_len + ip_encap_hlen(&tunnel->encap); |
3e08f4a7 | 770 | if (max_headroom > dev->needed_headroom) |
c5441932 | 771 | dev->needed_headroom = max_headroom; |
3e08f4a7 SK |
772 | |
773 | if (skb_cow_head(skb, dev->needed_headroom)) { | |
586d5fc8 | 774 | ip_rt_put(rt); |
3e08f4a7 | 775 | dev->stats.tx_dropped++; |
3acfa1e7 | 776 | kfree_skb(skb); |
3e08f4a7 | 777 | return; |
c5441932 PS |
778 | } |
779 | ||
039f5062 PS |
780 | iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, protocol, tos, ttl, |
781 | df, !net_eq(tunnel->net, dev_net(dev))); | |
c5441932 PS |
782 | return; |
783 | ||
784 | #if IS_ENABLED(CONFIG_IPV6) | |
785 | tx_error_icmp: | |
786 | dst_link_failure(skb); | |
787 | #endif | |
788 | tx_error: | |
789 | dev->stats.tx_errors++; | |
3acfa1e7 | 790 | kfree_skb(skb); |
c5441932 PS |
791 | } |
792 | EXPORT_SYMBOL_GPL(ip_tunnel_xmit); | |
793 | ||
794 | static void ip_tunnel_update(struct ip_tunnel_net *itn, | |
795 | struct ip_tunnel *t, | |
796 | struct net_device *dev, | |
797 | struct ip_tunnel_parm *p, | |
798 | bool set_mtu) | |
799 | { | |
2e15ea39 | 800 | ip_tunnel_del(itn, t); |
c5441932 PS |
801 | t->parms.iph.saddr = p->iph.saddr; |
802 | t->parms.iph.daddr = p->iph.daddr; | |
803 | t->parms.i_key = p->i_key; | |
804 | t->parms.o_key = p->o_key; | |
805 | if (dev->type != ARPHRD_ETHER) { | |
806 | memcpy(dev->dev_addr, &p->iph.saddr, 4); | |
807 | memcpy(dev->broadcast, &p->iph.daddr, 4); | |
808 | } | |
809 | ip_tunnel_add(itn, t); | |
810 | ||
811 | t->parms.iph.ttl = p->iph.ttl; | |
812 | t->parms.iph.tos = p->iph.tos; | |
813 | t->parms.iph.frag_off = p->iph.frag_off; | |
814 | ||
815 | if (t->parms.link != p->link) { | |
816 | int mtu; | |
817 | ||
818 | t->parms.link = p->link; | |
819 | mtu = ip_tunnel_bind_dev(dev); | |
820 | if (set_mtu) | |
821 | dev->mtu = mtu; | |
822 | } | |
e09acddf | 823 | dst_cache_reset(&t->dst_cache); |
c5441932 PS |
824 | netdev_state_change(dev); |
825 | } | |
826 | ||
827 | int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd) | |
828 | { | |
829 | int err = 0; | |
8c923ce2 ND |
830 | struct ip_tunnel *t = netdev_priv(dev); |
831 | struct net *net = t->net; | |
832 | struct ip_tunnel_net *itn = net_generic(net, t->ip_tnl_net_id); | |
c5441932 PS |
833 | |
834 | BUG_ON(!itn->fb_tunnel_dev); | |
835 | switch (cmd) { | |
836 | case SIOCGETTUNNEL: | |
8c923ce2 | 837 | if (dev == itn->fb_tunnel_dev) { |
c5441932 | 838 | t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type); |
51456b29 | 839 | if (!t) |
8c923ce2 ND |
840 | t = netdev_priv(dev); |
841 | } | |
c5441932 PS |
842 | memcpy(p, &t->parms, sizeof(*p)); |
843 | break; | |
844 | ||
845 | case SIOCADDTUNNEL: | |
846 | case SIOCCHGTUNNEL: | |
847 | err = -EPERM; | |
848 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
849 | goto done; | |
850 | if (p->iph.ttl) | |
851 | p->iph.frag_off |= htons(IP_DF); | |
7c8e6b9c DP |
852 | if (!(p->i_flags & VTI_ISVTI)) { |
853 | if (!(p->i_flags & TUNNEL_KEY)) | |
854 | p->i_key = 0; | |
855 | if (!(p->o_flags & TUNNEL_KEY)) | |
856 | p->o_key = 0; | |
857 | } | |
c5441932 PS |
858 | |
859 | t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type); | |
860 | ||
d61746b2 SK |
861 | if (cmd == SIOCADDTUNNEL) { |
862 | if (!t) { | |
863 | t = ip_tunnel_create(net, itn, p); | |
864 | err = PTR_ERR_OR_ZERO(t); | |
865 | break; | |
866 | } | |
867 | ||
868 | err = -EEXIST; | |
ee30ef4d | 869 | break; |
6dd3c9ec | 870 | } |
c5441932 | 871 | if (dev != itn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
00db4124 | 872 | if (t) { |
c5441932 PS |
873 | if (t->dev != dev) { |
874 | err = -EEXIST; | |
875 | break; | |
876 | } | |
877 | } else { | |
878 | unsigned int nflags = 0; | |
879 | ||
880 | if (ipv4_is_multicast(p->iph.daddr)) | |
881 | nflags = IFF_BROADCAST; | |
882 | else if (p->iph.daddr) | |
883 | nflags = IFF_POINTOPOINT; | |
884 | ||
885 | if ((dev->flags^nflags)&(IFF_POINTOPOINT|IFF_BROADCAST)) { | |
886 | err = -EINVAL; | |
887 | break; | |
888 | } | |
889 | ||
890 | t = netdev_priv(dev); | |
891 | } | |
892 | } | |
893 | ||
894 | if (t) { | |
895 | err = 0; | |
896 | ip_tunnel_update(itn, t, dev, p, true); | |
6dd3c9ec FW |
897 | } else { |
898 | err = -ENOENT; | |
899 | } | |
c5441932 PS |
900 | break; |
901 | ||
902 | case SIOCDELTUNNEL: | |
903 | err = -EPERM; | |
904 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
905 | goto done; | |
906 | ||
907 | if (dev == itn->fb_tunnel_dev) { | |
908 | err = -ENOENT; | |
909 | t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type); | |
51456b29 | 910 | if (!t) |
c5441932 PS |
911 | goto done; |
912 | err = -EPERM; | |
913 | if (t == netdev_priv(itn->fb_tunnel_dev)) | |
914 | goto done; | |
915 | dev = t->dev; | |
916 | } | |
917 | unregister_netdevice(dev); | |
918 | err = 0; | |
919 | break; | |
920 | ||
921 | default: | |
922 | err = -EINVAL; | |
923 | } | |
924 | ||
925 | done: | |
926 | return err; | |
927 | } | |
928 | EXPORT_SYMBOL_GPL(ip_tunnel_ioctl); | |
929 | ||
7e059158 | 930 | int __ip_tunnel_change_mtu(struct net_device *dev, int new_mtu, bool strict) |
c5441932 PS |
931 | { |
932 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
933 | int t_hlen = tunnel->hlen + sizeof(struct iphdr); | |
7e059158 | 934 | int max_mtu = 0xFFF8 - dev->hard_header_len - t_hlen; |
c5441932 | 935 | |
b96f9afe | 936 | if (new_mtu < ETH_MIN_MTU) |
c5441932 | 937 | return -EINVAL; |
7e059158 DW |
938 | |
939 | if (new_mtu > max_mtu) { | |
940 | if (strict) | |
941 | return -EINVAL; | |
942 | ||
943 | new_mtu = max_mtu; | |
944 | } | |
945 | ||
c5441932 PS |
946 | dev->mtu = new_mtu; |
947 | return 0; | |
948 | } | |
7e059158 DW |
949 | EXPORT_SYMBOL_GPL(__ip_tunnel_change_mtu); |
950 | ||
951 | int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu) | |
952 | { | |
953 | return __ip_tunnel_change_mtu(dev, new_mtu, true); | |
954 | } | |
c5441932 PS |
955 | EXPORT_SYMBOL_GPL(ip_tunnel_change_mtu); |
956 | ||
957 | static void ip_tunnel_dev_free(struct net_device *dev) | |
958 | { | |
959 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
960 | ||
961 | gro_cells_destroy(&tunnel->gro_cells); | |
e09acddf | 962 | dst_cache_destroy(&tunnel->dst_cache); |
c5441932 PS |
963 | free_percpu(dev->tstats); |
964 | free_netdev(dev); | |
965 | } | |
966 | ||
967 | void ip_tunnel_dellink(struct net_device *dev, struct list_head *head) | |
968 | { | |
c5441932 PS |
969 | struct ip_tunnel *tunnel = netdev_priv(dev); |
970 | struct ip_tunnel_net *itn; | |
971 | ||
6c742e71 | 972 | itn = net_generic(tunnel->net, tunnel->ip_tnl_net_id); |
c5441932 PS |
973 | |
974 | if (itn->fb_tunnel_dev != dev) { | |
2e15ea39 | 975 | ip_tunnel_del(itn, netdev_priv(dev)); |
c5441932 PS |
976 | unregister_netdevice_queue(dev, head); |
977 | } | |
978 | } | |
979 | EXPORT_SYMBOL_GPL(ip_tunnel_dellink); | |
980 | ||
1728d4fa ND |
981 | struct net *ip_tunnel_get_link_net(const struct net_device *dev) |
982 | { | |
983 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
984 | ||
985 | return tunnel->net; | |
986 | } | |
987 | EXPORT_SYMBOL(ip_tunnel_get_link_net); | |
988 | ||
1e99584b ND |
989 | int ip_tunnel_get_iflink(const struct net_device *dev) |
990 | { | |
991 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
992 | ||
993 | return tunnel->parms.link; | |
994 | } | |
995 | EXPORT_SYMBOL(ip_tunnel_get_iflink); | |
996 | ||
c7d03a00 | 997 | int ip_tunnel_init_net(struct net *net, unsigned int ip_tnl_net_id, |
c5441932 PS |
998 | struct rtnl_link_ops *ops, char *devname) |
999 | { | |
1000 | struct ip_tunnel_net *itn = net_generic(net, ip_tnl_net_id); | |
1001 | struct ip_tunnel_parm parms; | |
6261d983 | 1002 | unsigned int i; |
c5441932 | 1003 | |
6261d983 | 1004 | for (i = 0; i < IP_TNL_HASH_SIZE; i++) |
1005 | INIT_HLIST_HEAD(&itn->tunnels[i]); | |
c5441932 PS |
1006 | |
1007 | if (!ops) { | |
1008 | itn->fb_tunnel_dev = NULL; | |
1009 | return 0; | |
1010 | } | |
6261d983 | 1011 | |
c5441932 PS |
1012 | memset(&parms, 0, sizeof(parms)); |
1013 | if (devname) | |
1014 | strlcpy(parms.name, devname, IFNAMSIZ); | |
1015 | ||
1016 | rtnl_lock(); | |
1017 | itn->fb_tunnel_dev = __ip_tunnel_create(net, ops, &parms); | |
ea857f28 DC |
1018 | /* FB netdevice is special: we have one, and only one per netns. |
1019 | * Allowing to move it to another netns is clearly unsafe. | |
1020 | */ | |
67013282 | 1021 | if (!IS_ERR(itn->fb_tunnel_dev)) { |
b4de77ad | 1022 | itn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; |
78ff4be4 | 1023 | itn->fb_tunnel_dev->mtu = ip_tunnel_bind_dev(itn->fb_tunnel_dev); |
67013282 SK |
1024 | ip_tunnel_add(itn, netdev_priv(itn->fb_tunnel_dev)); |
1025 | } | |
b4de77ad | 1026 | rtnl_unlock(); |
c5441932 | 1027 | |
27d79f3b | 1028 | return PTR_ERR_OR_ZERO(itn->fb_tunnel_dev); |
c5441932 PS |
1029 | } |
1030 | EXPORT_SYMBOL_GPL(ip_tunnel_init_net); | |
1031 | ||
6c742e71 ND |
1032 | static void ip_tunnel_destroy(struct ip_tunnel_net *itn, struct list_head *head, |
1033 | struct rtnl_link_ops *ops) | |
c5441932 | 1034 | { |
6c742e71 ND |
1035 | struct net *net = dev_net(itn->fb_tunnel_dev); |
1036 | struct net_device *dev, *aux; | |
c5441932 PS |
1037 | int h; |
1038 | ||
6c742e71 ND |
1039 | for_each_netdev_safe(net, dev, aux) |
1040 | if (dev->rtnl_link_ops == ops) | |
1041 | unregister_netdevice_queue(dev, head); | |
1042 | ||
c5441932 PS |
1043 | for (h = 0; h < IP_TNL_HASH_SIZE; h++) { |
1044 | struct ip_tunnel *t; | |
1045 | struct hlist_node *n; | |
1046 | struct hlist_head *thead = &itn->tunnels[h]; | |
1047 | ||
1048 | hlist_for_each_entry_safe(t, n, thead, hash_node) | |
6c742e71 ND |
1049 | /* If dev is in the same netns, it has already |
1050 | * been added to the list by the previous loop. | |
1051 | */ | |
1052 | if (!net_eq(dev_net(t->dev), net)) | |
1053 | unregister_netdevice_queue(t->dev, head); | |
c5441932 | 1054 | } |
c5441932 PS |
1055 | } |
1056 | ||
6c742e71 | 1057 | void ip_tunnel_delete_net(struct ip_tunnel_net *itn, struct rtnl_link_ops *ops) |
c5441932 PS |
1058 | { |
1059 | LIST_HEAD(list); | |
1060 | ||
1061 | rtnl_lock(); | |
6c742e71 | 1062 | ip_tunnel_destroy(itn, &list, ops); |
c5441932 PS |
1063 | unregister_netdevice_many(&list); |
1064 | rtnl_unlock(); | |
c5441932 PS |
1065 | } |
1066 | EXPORT_SYMBOL_GPL(ip_tunnel_delete_net); | |
1067 | ||
1068 | int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[], | |
1069 | struct ip_tunnel_parm *p) | |
1070 | { | |
1071 | struct ip_tunnel *nt; | |
1072 | struct net *net = dev_net(dev); | |
1073 | struct ip_tunnel_net *itn; | |
1074 | int mtu; | |
1075 | int err; | |
1076 | ||
1077 | nt = netdev_priv(dev); | |
1078 | itn = net_generic(net, nt->ip_tnl_net_id); | |
1079 | ||
2e15ea39 PS |
1080 | if (nt->collect_md) { |
1081 | if (rtnl_dereference(itn->collect_md_tun)) | |
1082 | return -EEXIST; | |
1083 | } else { | |
1084 | if (ip_tunnel_find(itn, p, dev->type)) | |
1085 | return -EEXIST; | |
1086 | } | |
c5441932 | 1087 | |
5e6700b3 | 1088 | nt->net = net; |
c5441932 PS |
1089 | nt->parms = *p; |
1090 | err = register_netdevice(dev); | |
1091 | if (err) | |
1092 | goto out; | |
1093 | ||
1094 | if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) | |
1095 | eth_hw_addr_random(dev); | |
1096 | ||
1097 | mtu = ip_tunnel_bind_dev(dev); | |
1098 | if (!tb[IFLA_MTU]) | |
1099 | dev->mtu = mtu; | |
1100 | ||
1101 | ip_tunnel_add(itn, nt); | |
c5441932 PS |
1102 | out: |
1103 | return err; | |
1104 | } | |
1105 | EXPORT_SYMBOL_GPL(ip_tunnel_newlink); | |
1106 | ||
1107 | int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[], | |
1108 | struct ip_tunnel_parm *p) | |
1109 | { | |
6c742e71 | 1110 | struct ip_tunnel *t; |
c5441932 | 1111 | struct ip_tunnel *tunnel = netdev_priv(dev); |
6c742e71 | 1112 | struct net *net = tunnel->net; |
c5441932 PS |
1113 | struct ip_tunnel_net *itn = net_generic(net, tunnel->ip_tnl_net_id); |
1114 | ||
1115 | if (dev == itn->fb_tunnel_dev) | |
e05202e7 | 1116 | return fan_has_map(&tunnel->fan) ? 0 : -EINVAL; |
c5441932 | 1117 | |
c5441932 PS |
1118 | t = ip_tunnel_find(itn, p, dev->type); |
1119 | ||
1120 | if (t) { | |
1121 | if (t->dev != dev) | |
1122 | return -EEXIST; | |
1123 | } else { | |
6c742e71 | 1124 | t = tunnel; |
c5441932 PS |
1125 | |
1126 | if (dev->type != ARPHRD_ETHER) { | |
1127 | unsigned int nflags = 0; | |
1128 | ||
1129 | if (ipv4_is_multicast(p->iph.daddr)) | |
1130 | nflags = IFF_BROADCAST; | |
1131 | else if (p->iph.daddr) | |
1132 | nflags = IFF_POINTOPOINT; | |
1133 | ||
1134 | if ((dev->flags ^ nflags) & | |
1135 | (IFF_POINTOPOINT | IFF_BROADCAST)) | |
1136 | return -EINVAL; | |
1137 | } | |
1138 | } | |
1139 | ||
1140 | ip_tunnel_update(itn, t, dev, p, !tb[IFLA_MTU]); | |
1141 | return 0; | |
1142 | } | |
1143 | EXPORT_SYMBOL_GPL(ip_tunnel_changelink); | |
1144 | ||
1145 | int ip_tunnel_init(struct net_device *dev) | |
1146 | { | |
1147 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1148 | struct iphdr *iph = &tunnel->parms.iph; | |
1c213bd2 | 1149 | int err; |
c5441932 PS |
1150 | |
1151 | dev->destructor = ip_tunnel_dev_free; | |
1c213bd2 | 1152 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
c5441932 PS |
1153 | if (!dev->tstats) |
1154 | return -ENOMEM; | |
1155 | ||
e09acddf PA |
1156 | err = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); |
1157 | if (err) { | |
9a4aa9af | 1158 | free_percpu(dev->tstats); |
e09acddf | 1159 | return err; |
9a4aa9af TH |
1160 | } |
1161 | ||
c5441932 PS |
1162 | err = gro_cells_init(&tunnel->gro_cells, dev); |
1163 | if (err) { | |
e09acddf | 1164 | dst_cache_destroy(&tunnel->dst_cache); |
c5441932 PS |
1165 | free_percpu(dev->tstats); |
1166 | return err; | |
1167 | } | |
1168 | ||
1169 | tunnel->dev = dev; | |
6c742e71 | 1170 | tunnel->net = dev_net(dev); |
c5441932 PS |
1171 | strcpy(tunnel->parms.name, dev->name); |
1172 | iph->version = 4; | |
1173 | iph->ihl = 5; | |
1174 | ||
2e15ea39 PS |
1175 | if (tunnel->collect_md) { |
1176 | dev->features |= NETIF_F_NETNS_LOCAL; | |
1177 | netif_keep_dst(dev); | |
1178 | } | |
c5441932 PS |
1179 | return 0; |
1180 | } | |
1181 | EXPORT_SYMBOL_GPL(ip_tunnel_init); | |
1182 | ||
1183 | void ip_tunnel_uninit(struct net_device *dev) | |
1184 | { | |
c5441932 | 1185 | struct ip_tunnel *tunnel = netdev_priv(dev); |
6c742e71 | 1186 | struct net *net = tunnel->net; |
c5441932 PS |
1187 | struct ip_tunnel_net *itn; |
1188 | ||
1189 | itn = net_generic(net, tunnel->ip_tnl_net_id); | |
1190 | /* fb_tunnel_dev will be unregisted in net-exit call. */ | |
1191 | if (itn->fb_tunnel_dev != dev) | |
2e15ea39 | 1192 | ip_tunnel_del(itn, netdev_priv(dev)); |
7d442fab | 1193 | |
e09acddf | 1194 | dst_cache_reset(&tunnel->dst_cache); |
c5441932 PS |
1195 | } |
1196 | EXPORT_SYMBOL_GPL(ip_tunnel_uninit); | |
1197 | ||
1198 | /* Do least required initialization, rest of init is done in tunnel_init call */ | |
c7d03a00 | 1199 | void ip_tunnel_setup(struct net_device *dev, unsigned int net_id) |
c5441932 PS |
1200 | { |
1201 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1202 | tunnel->ip_tnl_net_id = net_id; | |
1203 | } | |
1204 | EXPORT_SYMBOL_GPL(ip_tunnel_setup); | |
1205 | ||
1206 | MODULE_LICENSE("GPL"); |