Commit | Line | Data |
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c9422999 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
c5441932 PS |
2 | /* |
3 | * Copyright (c) 2013 Nicira, Inc. | |
c5441932 PS |
4 | */ |
5 | ||
6 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
7 | ||
8 | #include <linux/capability.h> | |
9 | #include <linux/module.h> | |
10 | #include <linux/types.h> | |
11 | #include <linux/kernel.h> | |
12 | #include <linux/slab.h> | |
13 | #include <linux/uaccess.h> | |
14 | #include <linux/skbuff.h> | |
15 | #include <linux/netdevice.h> | |
16 | #include <linux/in.h> | |
17 | #include <linux/tcp.h> | |
18 | #include <linux/udp.h> | |
19 | #include <linux/if_arp.h> | |
c5441932 PS |
20 | #include <linux/init.h> |
21 | #include <linux/in6.h> | |
22 | #include <linux/inetdevice.h> | |
23 | #include <linux/igmp.h> | |
24 | #include <linux/netfilter_ipv4.h> | |
25 | #include <linux/etherdevice.h> | |
26 | #include <linux/if_ether.h> | |
27 | #include <linux/if_vlan.h> | |
28 | #include <linux/rculist.h> | |
27d79f3b | 29 | #include <linux/err.h> |
c5441932 PS |
30 | |
31 | #include <net/sock.h> | |
32 | #include <net/ip.h> | |
33 | #include <net/icmp.h> | |
34 | #include <net/protocol.h> | |
35 | #include <net/ip_tunnels.h> | |
36 | #include <net/arp.h> | |
37 | #include <net/checksum.h> | |
38 | #include <net/dsfield.h> | |
39 | #include <net/inet_ecn.h> | |
40 | #include <net/xfrm.h> | |
41 | #include <net/net_namespace.h> | |
42 | #include <net/netns/generic.h> | |
43 | #include <net/rtnetlink.h> | |
56328486 | 44 | #include <net/udp.h> |
cfc7381b | 45 | #include <net/dst_metadata.h> |
63487bab | 46 | |
c5441932 PS |
47 | #if IS_ENABLED(CONFIG_IPV6) |
48 | #include <net/ipv6.h> | |
49 | #include <net/ip6_fib.h> | |
50 | #include <net/ip6_route.h> | |
51 | #endif | |
52 | ||
967680e0 | 53 | static unsigned int ip_tunnel_hash(__be32 key, __be32 remote) |
c5441932 PS |
54 | { |
55 | return hash_32((__force u32)key ^ (__force u32)remote, | |
56 | IP_TNL_HASH_BITS); | |
57 | } | |
58 | ||
c5441932 PS |
59 | static bool ip_tunnel_key_match(const struct ip_tunnel_parm *p, |
60 | __be16 flags, __be32 key) | |
61 | { | |
62 | if (p->i_flags & TUNNEL_KEY) { | |
63 | if (flags & TUNNEL_KEY) | |
64 | return key == p->i_key; | |
65 | else | |
66 | /* key expected, none present */ | |
67 | return false; | |
68 | } else | |
69 | return !(flags & TUNNEL_KEY); | |
70 | } | |
71 | ||
72 | /* Fallback tunnel: no source, no destination, no key, no options | |
73 | ||
74 | Tunnel hash table: | |
75 | We require exact key match i.e. if a key is present in packet | |
76 | it will match only tunnel with the same key; if it is not present, | |
77 | it will match only keyless tunnel. | |
78 | ||
79 | All keysless packets, if not matched configured keyless tunnels | |
80 | will match fallback tunnel. | |
81 | Given src, dst and key, find appropriate for input tunnel. | |
82 | */ | |
83 | struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn, | |
84 | int link, __be16 flags, | |
85 | __be32 remote, __be32 local, | |
86 | __be32 key) | |
87 | { | |
c5441932 PS |
88 | struct ip_tunnel *t, *cand = NULL; |
89 | struct hlist_head *head; | |
ba61539c TY |
90 | struct net_device *ndev; |
91 | unsigned int hash; | |
c5441932 | 92 | |
967680e0 | 93 | hash = ip_tunnel_hash(key, remote); |
c5441932 PS |
94 | head = &itn->tunnels[hash]; |
95 | ||
96 | hlist_for_each_entry_rcu(t, head, hash_node) { | |
97 | if (local != t->parms.iph.saddr || | |
98 | remote != t->parms.iph.daddr || | |
99 | !(t->dev->flags & IFF_UP)) | |
100 | continue; | |
101 | ||
102 | if (!ip_tunnel_key_match(&t->parms, flags, key)) | |
103 | continue; | |
104 | ||
105 | if (t->parms.link == link) | |
106 | return t; | |
107 | else | |
108 | cand = t; | |
109 | } | |
110 | ||
111 | hlist_for_each_entry_rcu(t, head, hash_node) { | |
112 | if (remote != t->parms.iph.daddr || | |
e0056593 | 113 | t->parms.iph.saddr != 0 || |
c5441932 PS |
114 | !(t->dev->flags & IFF_UP)) |
115 | continue; | |
116 | ||
117 | if (!ip_tunnel_key_match(&t->parms, flags, key)) | |
118 | continue; | |
119 | ||
120 | if (t->parms.link == link) | |
121 | return t; | |
122 | else if (!cand) | |
123 | cand = t; | |
124 | } | |
125 | ||
967680e0 | 126 | hash = ip_tunnel_hash(key, 0); |
c5441932 PS |
127 | head = &itn->tunnels[hash]; |
128 | ||
129 | hlist_for_each_entry_rcu(t, head, hash_node) { | |
e0056593 DP |
130 | if ((local != t->parms.iph.saddr || t->parms.iph.daddr != 0) && |
131 | (local != t->parms.iph.daddr || !ipv4_is_multicast(local))) | |
132 | continue; | |
133 | ||
134 | if (!(t->dev->flags & IFF_UP)) | |
c5441932 PS |
135 | continue; |
136 | ||
137 | if (!ip_tunnel_key_match(&t->parms, flags, key)) | |
138 | continue; | |
139 | ||
140 | if (t->parms.link == link) | |
141 | return t; | |
142 | else if (!cand) | |
143 | cand = t; | |
144 | } | |
145 | ||
c5441932 | 146 | hlist_for_each_entry_rcu(t, head, hash_node) { |
25629fda | 147 | if ((!(flags & TUNNEL_NO_KEY) && t->parms.i_key != key) || |
e0056593 DP |
148 | t->parms.iph.saddr != 0 || |
149 | t->parms.iph.daddr != 0 || | |
c5441932 PS |
150 | !(t->dev->flags & IFF_UP)) |
151 | continue; | |
152 | ||
153 | if (t->parms.link == link) | |
154 | return t; | |
155 | else if (!cand) | |
156 | cand = t; | |
157 | } | |
158 | ||
c5441932 PS |
159 | if (cand) |
160 | return cand; | |
161 | ||
2e15ea39 | 162 | t = rcu_dereference(itn->collect_md_tun); |
833a8b40 | 163 | if (t && t->dev->flags & IFF_UP) |
2e15ea39 PS |
164 | return t; |
165 | ||
ba61539c TY |
166 | ndev = READ_ONCE(itn->fb_tunnel_dev); |
167 | if (ndev && ndev->flags & IFF_UP) | |
168 | return netdev_priv(ndev); | |
c5441932 | 169 | |
c5441932 PS |
170 | return NULL; |
171 | } | |
172 | EXPORT_SYMBOL_GPL(ip_tunnel_lookup); | |
173 | ||
174 | static struct hlist_head *ip_bucket(struct ip_tunnel_net *itn, | |
175 | struct ip_tunnel_parm *parms) | |
176 | { | |
177 | unsigned int h; | |
178 | __be32 remote; | |
6d608f06 | 179 | __be32 i_key = parms->i_key; |
c5441932 PS |
180 | |
181 | if (parms->iph.daddr && !ipv4_is_multicast(parms->iph.daddr)) | |
182 | remote = parms->iph.daddr; | |
183 | else | |
184 | remote = 0; | |
185 | ||
6d608f06 SK |
186 | if (!(parms->i_flags & TUNNEL_KEY) && (parms->i_flags & VTI_ISVTI)) |
187 | i_key = 0; | |
188 | ||
189 | h = ip_tunnel_hash(i_key, remote); | |
c5441932 PS |
190 | return &itn->tunnels[h]; |
191 | } | |
192 | ||
193 | static void ip_tunnel_add(struct ip_tunnel_net *itn, struct ip_tunnel *t) | |
194 | { | |
195 | struct hlist_head *head = ip_bucket(itn, &t->parms); | |
196 | ||
2e15ea39 PS |
197 | if (t->collect_md) |
198 | rcu_assign_pointer(itn->collect_md_tun, t); | |
c5441932 PS |
199 | hlist_add_head_rcu(&t->hash_node, head); |
200 | } | |
201 | ||
2e15ea39 | 202 | static void ip_tunnel_del(struct ip_tunnel_net *itn, struct ip_tunnel *t) |
c5441932 | 203 | { |
2e15ea39 PS |
204 | if (t->collect_md) |
205 | rcu_assign_pointer(itn->collect_md_tun, NULL); | |
c5441932 PS |
206 | hlist_del_init_rcu(&t->hash_node); |
207 | } | |
208 | ||
209 | static struct ip_tunnel *ip_tunnel_find(struct ip_tunnel_net *itn, | |
210 | struct ip_tunnel_parm *parms, | |
211 | int type) | |
212 | { | |
213 | __be32 remote = parms->iph.daddr; | |
214 | __be32 local = parms->iph.saddr; | |
215 | __be32 key = parms->i_key; | |
5ce54af1 | 216 | __be16 flags = parms->i_flags; |
c5441932 PS |
217 | int link = parms->link; |
218 | struct ip_tunnel *t = NULL; | |
219 | struct hlist_head *head = ip_bucket(itn, parms); | |
220 | ||
221 | hlist_for_each_entry_rcu(t, head, hash_node) { | |
222 | if (local == t->parms.iph.saddr && | |
223 | remote == t->parms.iph.daddr && | |
c5441932 | 224 | link == t->parms.link && |
5ce54af1 DP |
225 | type == t->dev->type && |
226 | ip_tunnel_key_match(&t->parms, flags, key)) | |
c5441932 PS |
227 | break; |
228 | } | |
229 | return t; | |
230 | } | |
231 | ||
232 | static struct net_device *__ip_tunnel_create(struct net *net, | |
233 | const struct rtnl_link_ops *ops, | |
234 | struct ip_tunnel_parm *parms) | |
235 | { | |
236 | int err; | |
237 | struct ip_tunnel *tunnel; | |
238 | struct net_device *dev; | |
239 | char name[IFNAMSIZ]; | |
240 | ||
9cb726a2 ED |
241 | err = -E2BIG; |
242 | if (parms->name[0]) { | |
243 | if (!dev_valid_name(parms->name)) | |
244 | goto failed; | |
c5441932 | 245 | strlcpy(name, parms->name, IFNAMSIZ); |
9cb726a2 ED |
246 | } else { |
247 | if (strlen(ops->kind) > (IFNAMSIZ - 3)) | |
c5441932 | 248 | goto failed; |
000ade80 SA |
249 | strcpy(name, ops->kind); |
250 | strcat(name, "%d"); | |
c5441932 PS |
251 | } |
252 | ||
253 | ASSERT_RTNL(); | |
c835a677 | 254 | dev = alloc_netdev(ops->priv_size, name, NET_NAME_UNKNOWN, ops->setup); |
c5441932 PS |
255 | if (!dev) { |
256 | err = -ENOMEM; | |
257 | goto failed; | |
258 | } | |
259 | dev_net_set(dev, net); | |
260 | ||
261 | dev->rtnl_link_ops = ops; | |
262 | ||
263 | tunnel = netdev_priv(dev); | |
264 | tunnel->parms = *parms; | |
5e6700b3 | 265 | tunnel->net = net; |
c5441932 PS |
266 | |
267 | err = register_netdevice(dev); | |
268 | if (err) | |
269 | goto failed_free; | |
270 | ||
271 | return dev; | |
272 | ||
273 | failed_free: | |
274 | free_netdev(dev); | |
275 | failed: | |
276 | return ERR_PTR(err); | |
277 | } | |
278 | ||
c5441932 PS |
279 | static int ip_tunnel_bind_dev(struct net_device *dev) |
280 | { | |
281 | struct net_device *tdev = NULL; | |
282 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
283 | const struct iphdr *iph; | |
284 | int hlen = LL_MAX_HEADER; | |
285 | int mtu = ETH_DATA_LEN; | |
286 | int t_hlen = tunnel->hlen + sizeof(struct iphdr); | |
287 | ||
288 | iph = &tunnel->parms.iph; | |
289 | ||
290 | /* Guess output device to choose reasonable mtu and needed_headroom */ | |
291 | if (iph->daddr) { | |
292 | struct flowi4 fl4; | |
293 | struct rtable *rt; | |
294 | ||
b0066da5 PM |
295 | ip_tunnel_init_flow(&fl4, iph->protocol, iph->daddr, |
296 | iph->saddr, tunnel->parms.o_key, | |
297 | RT_TOS(iph->tos), tunnel->parms.link, | |
24ba1440 | 298 | tunnel->fwmark, 0); |
7d442fab TH |
299 | rt = ip_route_output_key(tunnel->net, &fl4); |
300 | ||
c5441932 PS |
301 | if (!IS_ERR(rt)) { |
302 | tdev = rt->dst.dev; | |
303 | ip_rt_put(rt); | |
304 | } | |
305 | if (dev->type != ARPHRD_ETHER) | |
306 | dev->flags |= IFF_POINTOPOINT; | |
f27337e1 PA |
307 | |
308 | dst_cache_reset(&tunnel->dst_cache); | |
c5441932 PS |
309 | } |
310 | ||
311 | if (!tdev && tunnel->parms.link) | |
6c742e71 | 312 | tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link); |
c5441932 PS |
313 | |
314 | if (tdev) { | |
315 | hlen = tdev->hard_header_len + tdev->needed_headroom; | |
82612de1 | 316 | mtu = min(tdev->mtu, IP_MAX_MTU); |
c5441932 | 317 | } |
c5441932 PS |
318 | |
319 | dev->needed_headroom = t_hlen + hlen; | |
28e104d0 | 320 | mtu -= t_hlen; |
c5441932 | 321 | |
b5476022 ED |
322 | if (mtu < IPV4_MIN_MTU) |
323 | mtu = IPV4_MIN_MTU; | |
c5441932 PS |
324 | |
325 | return mtu; | |
326 | } | |
327 | ||
328 | static struct ip_tunnel *ip_tunnel_create(struct net *net, | |
329 | struct ip_tunnel_net *itn, | |
330 | struct ip_tunnel_parm *parms) | |
331 | { | |
4929fd8c | 332 | struct ip_tunnel *nt; |
c5441932 | 333 | struct net_device *dev; |
b96f9afe | 334 | int t_hlen; |
f6cc9c05 PM |
335 | int mtu; |
336 | int err; | |
c5441932 | 337 | |
79134e6c | 338 | dev = __ip_tunnel_create(net, itn->rtnl_link_ops, parms); |
c5441932 | 339 | if (IS_ERR(dev)) |
6dd3c9ec | 340 | return ERR_CAST(dev); |
c5441932 | 341 | |
f6cc9c05 PM |
342 | mtu = ip_tunnel_bind_dev(dev); |
343 | err = dev_set_mtu(dev, mtu); | |
344 | if (err) | |
345 | goto err_dev_set_mtu; | |
c5441932 PS |
346 | |
347 | nt = netdev_priv(dev); | |
b96f9afe JW |
348 | t_hlen = nt->hlen + sizeof(struct iphdr); |
349 | dev->min_mtu = ETH_MIN_MTU; | |
28e104d0 | 350 | dev->max_mtu = IP_MAX_MTU - t_hlen; |
c5441932 PS |
351 | ip_tunnel_add(itn, nt); |
352 | return nt; | |
f6cc9c05 PM |
353 | |
354 | err_dev_set_mtu: | |
355 | unregister_netdevice(dev); | |
356 | return ERR_PTR(err); | |
c5441932 PS |
357 | } |
358 | ||
359 | int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb, | |
2e15ea39 PS |
360 | const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst, |
361 | bool log_ecn_error) | |
c5441932 | 362 | { |
c5441932 PS |
363 | const struct iphdr *iph = ip_hdr(skb); |
364 | int err; | |
365 | ||
c5441932 PS |
366 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
367 | if (ipv4_is_multicast(iph->daddr)) { | |
c5441932 PS |
368 | tunnel->dev->stats.multicast++; |
369 | skb->pkt_type = PACKET_BROADCAST; | |
370 | } | |
371 | #endif | |
372 | ||
373 | if ((!(tpi->flags&TUNNEL_CSUM) && (tunnel->parms.i_flags&TUNNEL_CSUM)) || | |
374 | ((tpi->flags&TUNNEL_CSUM) && !(tunnel->parms.i_flags&TUNNEL_CSUM))) { | |
375 | tunnel->dev->stats.rx_crc_errors++; | |
376 | tunnel->dev->stats.rx_errors++; | |
377 | goto drop; | |
378 | } | |
379 | ||
380 | if (tunnel->parms.i_flags&TUNNEL_SEQ) { | |
381 | if (!(tpi->flags&TUNNEL_SEQ) || | |
382 | (tunnel->i_seqno && (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) { | |
383 | tunnel->dev->stats.rx_fifo_errors++; | |
384 | tunnel->dev->stats.rx_errors++; | |
385 | goto drop; | |
386 | } | |
387 | tunnel->i_seqno = ntohl(tpi->seq) + 1; | |
388 | } | |
389 | ||
e96f2e7c YC |
390 | skb_reset_network_header(skb); |
391 | ||
c5441932 PS |
392 | err = IP_ECN_decapsulate(iph, skb); |
393 | if (unlikely(err)) { | |
394 | if (log_ecn_error) | |
395 | net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", | |
396 | &iph->saddr, iph->tos); | |
397 | if (err > 1) { | |
398 | ++tunnel->dev->stats.rx_frame_errors; | |
399 | ++tunnel->dev->stats.rx_errors; | |
400 | goto drop; | |
401 | } | |
402 | } | |
403 | ||
560b50cf | 404 | dev_sw_netstats_rx_add(tunnel->dev, skb->len); |
81b9eab5 AS |
405 | skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev))); |
406 | ||
3d7b46cd PS |
407 | if (tunnel->dev->type == ARPHRD_ETHER) { |
408 | skb->protocol = eth_type_trans(skb, tunnel->dev); | |
409 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); | |
410 | } else { | |
411 | skb->dev = tunnel->dev; | |
412 | } | |
64261f23 | 413 | |
2e15ea39 PS |
414 | if (tun_dst) |
415 | skb_dst_set(skb, (struct dst_entry *)tun_dst); | |
416 | ||
c5441932 PS |
417 | gro_cells_receive(&tunnel->gro_cells, skb); |
418 | return 0; | |
419 | ||
420 | drop: | |
469f87e1 HY |
421 | if (tun_dst) |
422 | dst_release((struct dst_entry *)tun_dst); | |
c5441932 PS |
423 | kfree_skb(skb); |
424 | return 0; | |
425 | } | |
426 | EXPORT_SYMBOL_GPL(ip_tunnel_rcv); | |
427 | ||
a8c5f90f TH |
428 | int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *ops, |
429 | unsigned int num) | |
430 | { | |
bb1553c8 TG |
431 | if (num >= MAX_IPTUN_ENCAP_OPS) |
432 | return -ERANGE; | |
433 | ||
a8c5f90f TH |
434 | return !cmpxchg((const struct ip_tunnel_encap_ops **) |
435 | &iptun_encaps[num], | |
436 | NULL, ops) ? 0 : -1; | |
56328486 | 437 | } |
a8c5f90f TH |
438 | EXPORT_SYMBOL(ip_tunnel_encap_add_ops); |
439 | ||
440 | int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *ops, | |
441 | unsigned int num) | |
442 | { | |
443 | int ret; | |
444 | ||
bb1553c8 TG |
445 | if (num >= MAX_IPTUN_ENCAP_OPS) |
446 | return -ERANGE; | |
447 | ||
a8c5f90f TH |
448 | ret = (cmpxchg((const struct ip_tunnel_encap_ops **) |
449 | &iptun_encaps[num], | |
450 | ops, NULL) == ops) ? 0 : -1; | |
451 | ||
452 | synchronize_net(); | |
453 | ||
454 | return ret; | |
455 | } | |
456 | EXPORT_SYMBOL(ip_tunnel_encap_del_ops); | |
56328486 TH |
457 | |
458 | int ip_tunnel_encap_setup(struct ip_tunnel *t, | |
459 | struct ip_tunnel_encap *ipencap) | |
460 | { | |
461 | int hlen; | |
462 | ||
463 | memset(&t->encap, 0, sizeof(t->encap)); | |
464 | ||
465 | hlen = ip_encap_hlen(ipencap); | |
466 | if (hlen < 0) | |
467 | return hlen; | |
468 | ||
469 | t->encap.type = ipencap->type; | |
470 | t->encap.sport = ipencap->sport; | |
471 | t->encap.dport = ipencap->dport; | |
472 | t->encap.flags = ipencap->flags; | |
473 | ||
474 | t->encap_hlen = hlen; | |
475 | t->hlen = t->encap_hlen + t->tun_hlen; | |
476 | ||
477 | return 0; | |
478 | } | |
479 | EXPORT_SYMBOL_GPL(ip_tunnel_encap_setup); | |
480 | ||
23a3647b | 481 | static int tnl_update_pmtu(struct net_device *dev, struct sk_buff *skb, |
fc24f2b2 | 482 | struct rtable *rt, __be16 df, |
c8b34e68 | 483 | const struct iphdr *inner_iph, |
484 | int tunnel_hlen, __be32 dst, bool md) | |
23a3647b PS |
485 | { |
486 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
c8b34e68 | 487 | int pkt_size; |
23a3647b PS |
488 | int mtu; |
489 | ||
c8b34e68 | 490 | tunnel_hlen = md ? tunnel_hlen : tunnel->hlen; |
28e104d0 | 491 | pkt_size = skb->len - tunnel_hlen; |
c8b34e68 | 492 | |
23a3647b | 493 | if (df) |
28e104d0 | 494 | mtu = dst_mtu(&rt->dst) - (sizeof(struct iphdr) + tunnel_hlen); |
23a3647b | 495 | else |
f4b3ec4e | 496 | mtu = skb_valid_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu; |
23a3647b | 497 | |
f4b3ec4e | 498 | if (skb_valid_dst(skb)) |
7a1592bc | 499 | skb_dst_update_pmtu_no_confirm(skb, mtu); |
23a3647b PS |
500 | |
501 | if (skb->protocol == htons(ETH_P_IP)) { | |
502 | if (!skb_is_gso(skb) && | |
fc24f2b2 TT |
503 | (inner_iph->frag_off & htons(IP_DF)) && |
504 | mtu < pkt_size) { | |
4372339e | 505 | icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); |
23a3647b PS |
506 | return -E2BIG; |
507 | } | |
508 | } | |
509 | #if IS_ENABLED(CONFIG_IPV6) | |
510 | else if (skb->protocol == htons(ETH_P_IPV6)) { | |
f4b3ec4e | 511 | struct rt6_info *rt6; |
c8b34e68 | 512 | __be32 daddr; |
513 | ||
f4b3ec4e AM |
514 | rt6 = skb_valid_dst(skb) ? (struct rt6_info *)skb_dst(skb) : |
515 | NULL; | |
c8b34e68 | 516 | daddr = md ? dst : tunnel->parms.iph.daddr; |
23a3647b PS |
517 | |
518 | if (rt6 && mtu < dst_mtu(skb_dst(skb)) && | |
519 | mtu >= IPV6_MIN_MTU) { | |
c8b34e68 | 520 | if ((daddr && !ipv4_is_multicast(daddr)) || |
23a3647b PS |
521 | rt6->rt6i_dst.plen == 128) { |
522 | rt6->rt6i_flags |= RTF_MODIFIED; | |
523 | dst_metric_set(skb_dst(skb), RTAX_MTU, mtu); | |
524 | } | |
525 | } | |
526 | ||
527 | if (!skb_is_gso(skb) && mtu >= IPV6_MIN_MTU && | |
528 | mtu < pkt_size) { | |
4372339e | 529 | icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
23a3647b PS |
530 | return -E2BIG; |
531 | } | |
532 | } | |
533 | #endif | |
534 | return 0; | |
535 | } | |
536 | ||
c8b34e68 | 537 | void ip_md_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, |
538 | u8 proto, int tunnel_hlen) | |
cfc7381b AS |
539 | { |
540 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
541 | u32 headroom = sizeof(struct iphdr); | |
542 | struct ip_tunnel_info *tun_info; | |
543 | const struct ip_tunnel_key *key; | |
544 | const struct iphdr *inner_iph; | |
f46fe4f8 | 545 | struct rtable *rt = NULL; |
cfc7381b AS |
546 | struct flowi4 fl4; |
547 | __be16 df = 0; | |
548 | u8 tos, ttl; | |
f46fe4f8 | 549 | bool use_cache; |
cfc7381b AS |
550 | |
551 | tun_info = skb_tunnel_info(skb); | |
552 | if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) || | |
553 | ip_tunnel_info_af(tun_info) != AF_INET)) | |
554 | goto tx_error; | |
555 | key = &tun_info->key; | |
556 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); | |
557 | inner_iph = (const struct iphdr *)skb_inner_network_header(skb); | |
558 | tos = key->tos; | |
559 | if (tos == 1) { | |
560 | if (skb->protocol == htons(ETH_P_IP)) | |
561 | tos = inner_iph->tos; | |
562 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
563 | tos = ipv6_get_dsfield((const struct ipv6hdr *)inner_iph); | |
564 | } | |
6e6b904a | 565 | ip_tunnel_init_flow(&fl4, proto, key->u.ipv4.dst, key->u.ipv4.src, |
566 | tunnel_id_to_key32(key->tun_id), RT_TOS(tos), | |
24ba1440 | 567 | 0, skb->mark, skb_get_hash(skb)); |
cfc7381b AS |
568 | if (tunnel->encap.type != TUNNEL_ENCAP_NONE) |
569 | goto tx_error; | |
f46fe4f8 | 570 | |
571 | use_cache = ip_tunnel_dst_cache_usable(skb, tun_info); | |
572 | if (use_cache) | |
573 | rt = dst_cache_get_ip4(&tun_info->dst_cache, &fl4.saddr); | |
574 | if (!rt) { | |
575 | rt = ip_route_output_key(tunnel->net, &fl4); | |
576 | if (IS_ERR(rt)) { | |
577 | dev->stats.tx_carrier_errors++; | |
578 | goto tx_error; | |
579 | } | |
580 | if (use_cache) | |
581 | dst_cache_set_ip4(&tun_info->dst_cache, &rt->dst, | |
582 | fl4.saddr); | |
cfc7381b AS |
583 | } |
584 | if (rt->dst.dev == dev) { | |
585 | ip_rt_put(rt); | |
586 | dev->stats.collisions++; | |
587 | goto tx_error; | |
588 | } | |
c8b34e68 | 589 | |
590 | if (key->tun_flags & TUNNEL_DONT_FRAGMENT) | |
591 | df = htons(IP_DF); | |
592 | if (tnl_update_pmtu(dev, skb, rt, df, inner_iph, tunnel_hlen, | |
593 | key->u.ipv4.dst, true)) { | |
594 | ip_rt_put(rt); | |
595 | goto tx_error; | |
596 | } | |
597 | ||
cfc7381b AS |
598 | tos = ip_tunnel_ecn_encap(tos, inner_iph, skb); |
599 | ttl = key->ttl; | |
600 | if (ttl == 0) { | |
601 | if (skb->protocol == htons(ETH_P_IP)) | |
602 | ttl = inner_iph->ttl; | |
603 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
604 | ttl = ((const struct ipv6hdr *)inner_iph)->hop_limit; | |
605 | else | |
606 | ttl = ip4_dst_hoplimit(&rt->dst); | |
607 | } | |
c8b34e68 | 608 | |
cfc7381b AS |
609 | headroom += LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len; |
610 | if (headroom > dev->needed_headroom) | |
611 | dev->needed_headroom = headroom; | |
612 | ||
613 | if (skb_cow_head(skb, dev->needed_headroom)) { | |
614 | ip_rt_put(rt); | |
615 | goto tx_dropped; | |
616 | } | |
0f693f19 HY |
617 | iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, proto, tos, ttl, |
618 | df, !net_eq(tunnel->net, dev_net(dev))); | |
cfc7381b AS |
619 | return; |
620 | tx_error: | |
621 | dev->stats.tx_errors++; | |
622 | goto kfree; | |
623 | tx_dropped: | |
624 | dev->stats.tx_dropped++; | |
625 | kfree: | |
626 | kfree_skb(skb); | |
627 | } | |
628 | EXPORT_SYMBOL_GPL(ip_md_tunnel_xmit); | |
629 | ||
c5441932 | 630 | void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, |
56328486 | 631 | const struct iphdr *tnl_params, u8 protocol) |
c5441932 PS |
632 | { |
633 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
186d9366 | 634 | struct ip_tunnel_info *tun_info = NULL; |
c5441932 | 635 | const struct iphdr *inner_iph; |
c5441932 | 636 | unsigned int max_headroom; /* The extra header space needed */ |
186d9366 | 637 | struct rtable *rt = NULL; /* Route to the other host */ |
638 | bool use_cache = false; | |
639 | struct flowi4 fl4; | |
640 | bool md = false; | |
22fb22ea | 641 | bool connected; |
186d9366 | 642 | u8 tos, ttl; |
643 | __be32 dst; | |
644 | __be16 df; | |
c5441932 PS |
645 | |
646 | inner_iph = (const struct iphdr *)skb_inner_network_header(skb); | |
22fb22ea | 647 | connected = (tunnel->parms.iph.daddr != 0); |
c5441932 | 648 | |
5146d1f1 BH |
649 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
650 | ||
c5441932 PS |
651 | dst = tnl_params->daddr; |
652 | if (dst == 0) { | |
653 | /* NBMA tunnel */ | |
654 | ||
51456b29 | 655 | if (!skb_dst(skb)) { |
c5441932 PS |
656 | dev->stats.tx_fifo_errors++; |
657 | goto tx_error; | |
658 | } | |
659 | ||
d71b5753 | 660 | tun_info = skb_tunnel_info(skb); |
661 | if (tun_info && (tun_info->mode & IP_TUNNEL_INFO_TX) && | |
662 | ip_tunnel_info_af(tun_info) == AF_INET && | |
186d9366 | 663 | tun_info->key.u.ipv4.dst) { |
d71b5753 | 664 | dst = tun_info->key.u.ipv4.dst; |
186d9366 | 665 | md = true; |
666 | connected = true; | |
667 | } | |
d71b5753 | 668 | else if (skb->protocol == htons(ETH_P_IP)) { |
c5441932 PS |
669 | rt = skb_rtable(skb); |
670 | dst = rt_nexthop(rt, inner_iph->daddr); | |
671 | } | |
672 | #if IS_ENABLED(CONFIG_IPV6) | |
673 | else if (skb->protocol == htons(ETH_P_IPV6)) { | |
674 | const struct in6_addr *addr6; | |
675 | struct neighbour *neigh; | |
676 | bool do_tx_error_icmp; | |
677 | int addr_type; | |
678 | ||
679 | neigh = dst_neigh_lookup(skb_dst(skb), | |
680 | &ipv6_hdr(skb)->daddr); | |
51456b29 | 681 | if (!neigh) |
c5441932 PS |
682 | goto tx_error; |
683 | ||
684 | addr6 = (const struct in6_addr *)&neigh->primary_key; | |
685 | addr_type = ipv6_addr_type(addr6); | |
686 | ||
687 | if (addr_type == IPV6_ADDR_ANY) { | |
688 | addr6 = &ipv6_hdr(skb)->daddr; | |
689 | addr_type = ipv6_addr_type(addr6); | |
690 | } | |
691 | ||
692 | if ((addr_type & IPV6_ADDR_COMPATv4) == 0) | |
693 | do_tx_error_icmp = true; | |
694 | else { | |
695 | do_tx_error_icmp = false; | |
696 | dst = addr6->s6_addr32[3]; | |
697 | } | |
698 | neigh_release(neigh); | |
699 | if (do_tx_error_icmp) | |
700 | goto tx_error_icmp; | |
701 | } | |
702 | #endif | |
703 | else | |
704 | goto tx_error; | |
7d442fab | 705 | |
186d9366 | 706 | if (!md) |
707 | connected = false; | |
c5441932 PS |
708 | } |
709 | ||
710 | tos = tnl_params->tos; | |
711 | if (tos & 0x1) { | |
712 | tos &= ~0x1; | |
7d442fab | 713 | if (skb->protocol == htons(ETH_P_IP)) { |
c5441932 | 714 | tos = inner_iph->tos; |
7d442fab TH |
715 | connected = false; |
716 | } else if (skb->protocol == htons(ETH_P_IPV6)) { | |
c5441932 | 717 | tos = ipv6_get_dsfield((const struct ipv6hdr *)inner_iph); |
7d442fab TH |
718 | connected = false; |
719 | } | |
c5441932 PS |
720 | } |
721 | ||
0f3e9c97 DM |
722 | ip_tunnel_init_flow(&fl4, protocol, dst, tnl_params->saddr, |
723 | tunnel->parms.o_key, RT_TOS(tos), tunnel->parms.link, | |
24ba1440 | 724 | tunnel->fwmark, skb_get_hash(skb)); |
7d442fab | 725 | |
56328486 TH |
726 | if (ip_tunnel_encap(skb, tunnel, &protocol, &fl4) < 0) |
727 | goto tx_error; | |
728 | ||
186d9366 | 729 | if (connected && md) { |
730 | use_cache = ip_tunnel_dst_cache_usable(skb, tun_info); | |
731 | if (use_cache) | |
732 | rt = dst_cache_get_ip4(&tun_info->dst_cache, | |
733 | &fl4.saddr); | |
734 | } else { | |
735 | rt = connected ? dst_cache_get_ip4(&tunnel->dst_cache, | |
736 | &fl4.saddr) : NULL; | |
737 | } | |
7d442fab TH |
738 | |
739 | if (!rt) { | |
740 | rt = ip_route_output_key(tunnel->net, &fl4); | |
741 | ||
742 | if (IS_ERR(rt)) { | |
743 | dev->stats.tx_carrier_errors++; | |
744 | goto tx_error; | |
745 | } | |
186d9366 | 746 | if (use_cache) |
747 | dst_cache_set_ip4(&tun_info->dst_cache, &rt->dst, | |
748 | fl4.saddr); | |
749 | else if (!md && connected) | |
e09acddf PA |
750 | dst_cache_set_ip4(&tunnel->dst_cache, &rt->dst, |
751 | fl4.saddr); | |
c5441932 | 752 | } |
7d442fab | 753 | |
0e6fbc5b | 754 | if (rt->dst.dev == dev) { |
c5441932 PS |
755 | ip_rt_put(rt); |
756 | dev->stats.collisions++; | |
757 | goto tx_error; | |
758 | } | |
c5441932 | 759 | |
50c66167 FW |
760 | df = tnl_params->frag_off; |
761 | if (skb->protocol == htons(ETH_P_IP) && !tunnel->ignore_df) | |
762 | df |= (inner_iph->frag_off & htons(IP_DF)); | |
763 | ||
764 | if (tnl_update_pmtu(dev, skb, rt, df, inner_iph, 0, 0, false)) { | |
23a3647b PS |
765 | ip_rt_put(rt); |
766 | goto tx_error; | |
c5441932 | 767 | } |
c5441932 PS |
768 | |
769 | if (tunnel->err_count > 0) { | |
770 | if (time_before(jiffies, | |
771 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
772 | tunnel->err_count--; | |
773 | ||
774 | dst_link_failure(skb); | |
775 | } else | |
776 | tunnel->err_count = 0; | |
777 | } | |
778 | ||
d4a71b15 | 779 | tos = ip_tunnel_ecn_encap(tos, inner_iph, skb); |
c5441932 PS |
780 | ttl = tnl_params->ttl; |
781 | if (ttl == 0) { | |
782 | if (skb->protocol == htons(ETH_P_IP)) | |
783 | ttl = inner_iph->ttl; | |
784 | #if IS_ENABLED(CONFIG_IPV6) | |
785 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
786 | ttl = ((const struct ipv6hdr *)inner_iph)->hop_limit; | |
787 | #endif | |
788 | else | |
789 | ttl = ip4_dst_hoplimit(&rt->dst); | |
790 | } | |
791 | ||
0e6fbc5b | 792 | max_headroom = LL_RESERVED_SPACE(rt->dst.dev) + sizeof(struct iphdr) |
7371e022 | 793 | + rt->dst.header_len + ip_encap_hlen(&tunnel->encap); |
3e08f4a7 | 794 | if (max_headroom > dev->needed_headroom) |
c5441932 | 795 | dev->needed_headroom = max_headroom; |
3e08f4a7 SK |
796 | |
797 | if (skb_cow_head(skb, dev->needed_headroom)) { | |
586d5fc8 | 798 | ip_rt_put(rt); |
3e08f4a7 | 799 | dev->stats.tx_dropped++; |
3acfa1e7 | 800 | kfree_skb(skb); |
3e08f4a7 | 801 | return; |
c5441932 PS |
802 | } |
803 | ||
039f5062 PS |
804 | iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, protocol, tos, ttl, |
805 | df, !net_eq(tunnel->net, dev_net(dev))); | |
c5441932 PS |
806 | return; |
807 | ||
808 | #if IS_ENABLED(CONFIG_IPV6) | |
809 | tx_error_icmp: | |
810 | dst_link_failure(skb); | |
811 | #endif | |
812 | tx_error: | |
813 | dev->stats.tx_errors++; | |
3acfa1e7 | 814 | kfree_skb(skb); |
c5441932 PS |
815 | } |
816 | EXPORT_SYMBOL_GPL(ip_tunnel_xmit); | |
817 | ||
818 | static void ip_tunnel_update(struct ip_tunnel_net *itn, | |
819 | struct ip_tunnel *t, | |
820 | struct net_device *dev, | |
821 | struct ip_tunnel_parm *p, | |
9830ad4c CG |
822 | bool set_mtu, |
823 | __u32 fwmark) | |
c5441932 | 824 | { |
2e15ea39 | 825 | ip_tunnel_del(itn, t); |
c5441932 PS |
826 | t->parms.iph.saddr = p->iph.saddr; |
827 | t->parms.iph.daddr = p->iph.daddr; | |
828 | t->parms.i_key = p->i_key; | |
829 | t->parms.o_key = p->o_key; | |
830 | if (dev->type != ARPHRD_ETHER) { | |
831 | memcpy(dev->dev_addr, &p->iph.saddr, 4); | |
832 | memcpy(dev->broadcast, &p->iph.daddr, 4); | |
833 | } | |
834 | ip_tunnel_add(itn, t); | |
835 | ||
836 | t->parms.iph.ttl = p->iph.ttl; | |
837 | t->parms.iph.tos = p->iph.tos; | |
838 | t->parms.iph.frag_off = p->iph.frag_off; | |
839 | ||
9830ad4c | 840 | if (t->parms.link != p->link || t->fwmark != fwmark) { |
c5441932 PS |
841 | int mtu; |
842 | ||
843 | t->parms.link = p->link; | |
9830ad4c | 844 | t->fwmark = fwmark; |
c5441932 PS |
845 | mtu = ip_tunnel_bind_dev(dev); |
846 | if (set_mtu) | |
847 | dev->mtu = mtu; | |
848 | } | |
e09acddf | 849 | dst_cache_reset(&t->dst_cache); |
c5441932 PS |
850 | netdev_state_change(dev); |
851 | } | |
852 | ||
607259a6 | 853 | int ip_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd) |
c5441932 PS |
854 | { |
855 | int err = 0; | |
8c923ce2 ND |
856 | struct ip_tunnel *t = netdev_priv(dev); |
857 | struct net *net = t->net; | |
858 | struct ip_tunnel_net *itn = net_generic(net, t->ip_tnl_net_id); | |
c5441932 | 859 | |
c5441932 PS |
860 | switch (cmd) { |
861 | case SIOCGETTUNNEL: | |
8c923ce2 | 862 | if (dev == itn->fb_tunnel_dev) { |
c5441932 | 863 | t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type); |
51456b29 | 864 | if (!t) |
8c923ce2 ND |
865 | t = netdev_priv(dev); |
866 | } | |
c5441932 PS |
867 | memcpy(p, &t->parms, sizeof(*p)); |
868 | break; | |
869 | ||
870 | case SIOCADDTUNNEL: | |
871 | case SIOCCHGTUNNEL: | |
872 | err = -EPERM; | |
873 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
874 | goto done; | |
875 | if (p->iph.ttl) | |
876 | p->iph.frag_off |= htons(IP_DF); | |
7c8e6b9c DP |
877 | if (!(p->i_flags & VTI_ISVTI)) { |
878 | if (!(p->i_flags & TUNNEL_KEY)) | |
879 | p->i_key = 0; | |
880 | if (!(p->o_flags & TUNNEL_KEY)) | |
881 | p->o_key = 0; | |
882 | } | |
c5441932 | 883 | |
79134e6c | 884 | t = ip_tunnel_find(itn, p, itn->type); |
c5441932 | 885 | |
d61746b2 SK |
886 | if (cmd == SIOCADDTUNNEL) { |
887 | if (!t) { | |
888 | t = ip_tunnel_create(net, itn, p); | |
889 | err = PTR_ERR_OR_ZERO(t); | |
890 | break; | |
891 | } | |
892 | ||
893 | err = -EEXIST; | |
ee30ef4d | 894 | break; |
6dd3c9ec | 895 | } |
c5441932 | 896 | if (dev != itn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
00db4124 | 897 | if (t) { |
c5441932 PS |
898 | if (t->dev != dev) { |
899 | err = -EEXIST; | |
900 | break; | |
901 | } | |
902 | } else { | |
903 | unsigned int nflags = 0; | |
904 | ||
905 | if (ipv4_is_multicast(p->iph.daddr)) | |
906 | nflags = IFF_BROADCAST; | |
907 | else if (p->iph.daddr) | |
908 | nflags = IFF_POINTOPOINT; | |
909 | ||
910 | if ((dev->flags^nflags)&(IFF_POINTOPOINT|IFF_BROADCAST)) { | |
911 | err = -EINVAL; | |
912 | break; | |
913 | } | |
914 | ||
915 | t = netdev_priv(dev); | |
916 | } | |
917 | } | |
918 | ||
919 | if (t) { | |
920 | err = 0; | |
9830ad4c | 921 | ip_tunnel_update(itn, t, dev, p, true, 0); |
6dd3c9ec FW |
922 | } else { |
923 | err = -ENOENT; | |
924 | } | |
c5441932 PS |
925 | break; |
926 | ||
927 | case SIOCDELTUNNEL: | |
928 | err = -EPERM; | |
929 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
930 | goto done; | |
931 | ||
932 | if (dev == itn->fb_tunnel_dev) { | |
933 | err = -ENOENT; | |
934 | t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type); | |
51456b29 | 935 | if (!t) |
c5441932 PS |
936 | goto done; |
937 | err = -EPERM; | |
938 | if (t == netdev_priv(itn->fb_tunnel_dev)) | |
939 | goto done; | |
940 | dev = t->dev; | |
941 | } | |
942 | unregister_netdevice(dev); | |
943 | err = 0; | |
944 | break; | |
945 | ||
946 | default: | |
947 | err = -EINVAL; | |
948 | } | |
949 | ||
950 | done: | |
951 | return err; | |
952 | } | |
607259a6 CH |
953 | EXPORT_SYMBOL_GPL(ip_tunnel_ctl); |
954 | ||
955 | int ip_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) | |
956 | { | |
957 | struct ip_tunnel_parm p; | |
958 | int err; | |
959 | ||
960 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
961 | return -EFAULT; | |
962 | err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, cmd); | |
963 | if (!err && copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
964 | return -EFAULT; | |
965 | return err; | |
966 | } | |
c5441932 PS |
967 | EXPORT_SYMBOL_GPL(ip_tunnel_ioctl); |
968 | ||
7e059158 | 969 | int __ip_tunnel_change_mtu(struct net_device *dev, int new_mtu, bool strict) |
c5441932 PS |
970 | { |
971 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
972 | int t_hlen = tunnel->hlen + sizeof(struct iphdr); | |
28e104d0 | 973 | int max_mtu = IP_MAX_MTU - t_hlen; |
c5441932 | 974 | |
b96f9afe | 975 | if (new_mtu < ETH_MIN_MTU) |
c5441932 | 976 | return -EINVAL; |
7e059158 DW |
977 | |
978 | if (new_mtu > max_mtu) { | |
979 | if (strict) | |
980 | return -EINVAL; | |
981 | ||
982 | new_mtu = max_mtu; | |
983 | } | |
984 | ||
c5441932 PS |
985 | dev->mtu = new_mtu; |
986 | return 0; | |
987 | } | |
7e059158 DW |
988 | EXPORT_SYMBOL_GPL(__ip_tunnel_change_mtu); |
989 | ||
990 | int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu) | |
991 | { | |
992 | return __ip_tunnel_change_mtu(dev, new_mtu, true); | |
993 | } | |
c5441932 PS |
994 | EXPORT_SYMBOL_GPL(ip_tunnel_change_mtu); |
995 | ||
996 | static void ip_tunnel_dev_free(struct net_device *dev) | |
997 | { | |
998 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
999 | ||
1000 | gro_cells_destroy(&tunnel->gro_cells); | |
e09acddf | 1001 | dst_cache_destroy(&tunnel->dst_cache); |
c5441932 | 1002 | free_percpu(dev->tstats); |
c5441932 PS |
1003 | } |
1004 | ||
1005 | void ip_tunnel_dellink(struct net_device *dev, struct list_head *head) | |
1006 | { | |
c5441932 PS |
1007 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1008 | struct ip_tunnel_net *itn; | |
1009 | ||
6c742e71 | 1010 | itn = net_generic(tunnel->net, tunnel->ip_tnl_net_id); |
c5441932 PS |
1011 | |
1012 | if (itn->fb_tunnel_dev != dev) { | |
2e15ea39 | 1013 | ip_tunnel_del(itn, netdev_priv(dev)); |
c5441932 PS |
1014 | unregister_netdevice_queue(dev, head); |
1015 | } | |
1016 | } | |
1017 | EXPORT_SYMBOL_GPL(ip_tunnel_dellink); | |
1018 | ||
1728d4fa ND |
1019 | struct net *ip_tunnel_get_link_net(const struct net_device *dev) |
1020 | { | |
1021 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1022 | ||
1023 | return tunnel->net; | |
1024 | } | |
1025 | EXPORT_SYMBOL(ip_tunnel_get_link_net); | |
1026 | ||
1e99584b ND |
1027 | int ip_tunnel_get_iflink(const struct net_device *dev) |
1028 | { | |
1029 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1030 | ||
1031 | return tunnel->parms.link; | |
1032 | } | |
1033 | EXPORT_SYMBOL(ip_tunnel_get_iflink); | |
1034 | ||
c7d03a00 | 1035 | int ip_tunnel_init_net(struct net *net, unsigned int ip_tnl_net_id, |
c5441932 PS |
1036 | struct rtnl_link_ops *ops, char *devname) |
1037 | { | |
1038 | struct ip_tunnel_net *itn = net_generic(net, ip_tnl_net_id); | |
1039 | struct ip_tunnel_parm parms; | |
6261d983 | 1040 | unsigned int i; |
c5441932 | 1041 | |
79134e6c | 1042 | itn->rtnl_link_ops = ops; |
6261d983 | 1043 | for (i = 0; i < IP_TNL_HASH_SIZE; i++) |
1044 | INIT_HLIST_HEAD(&itn->tunnels[i]); | |
c5441932 | 1045 | |
79134e6c ED |
1046 | if (!ops || !net_has_fallback_tunnels(net)) { |
1047 | struct ip_tunnel_net *it_init_net; | |
1048 | ||
1049 | it_init_net = net_generic(&init_net, ip_tnl_net_id); | |
1050 | itn->type = it_init_net->type; | |
c5441932 PS |
1051 | itn->fb_tunnel_dev = NULL; |
1052 | return 0; | |
1053 | } | |
6261d983 | 1054 | |
c5441932 PS |
1055 | memset(&parms, 0, sizeof(parms)); |
1056 | if (devname) | |
1057 | strlcpy(parms.name, devname, IFNAMSIZ); | |
1058 | ||
1059 | rtnl_lock(); | |
1060 | itn->fb_tunnel_dev = __ip_tunnel_create(net, ops, &parms); | |
ea857f28 DC |
1061 | /* FB netdevice is special: we have one, and only one per netns. |
1062 | * Allowing to move it to another netns is clearly unsafe. | |
1063 | */ | |
67013282 | 1064 | if (!IS_ERR(itn->fb_tunnel_dev)) { |
b4de77ad | 1065 | itn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; |
78ff4be4 | 1066 | itn->fb_tunnel_dev->mtu = ip_tunnel_bind_dev(itn->fb_tunnel_dev); |
67013282 | 1067 | ip_tunnel_add(itn, netdev_priv(itn->fb_tunnel_dev)); |
79134e6c | 1068 | itn->type = itn->fb_tunnel_dev->type; |
67013282 | 1069 | } |
b4de77ad | 1070 | rtnl_unlock(); |
c5441932 | 1071 | |
27d79f3b | 1072 | return PTR_ERR_OR_ZERO(itn->fb_tunnel_dev); |
c5441932 PS |
1073 | } |
1074 | EXPORT_SYMBOL_GPL(ip_tunnel_init_net); | |
1075 | ||
79134e6c ED |
1076 | static void ip_tunnel_destroy(struct net *net, struct ip_tunnel_net *itn, |
1077 | struct list_head *head, | |
6c742e71 | 1078 | struct rtnl_link_ops *ops) |
c5441932 | 1079 | { |
6c742e71 | 1080 | struct net_device *dev, *aux; |
c5441932 PS |
1081 | int h; |
1082 | ||
6c742e71 ND |
1083 | for_each_netdev_safe(net, dev, aux) |
1084 | if (dev->rtnl_link_ops == ops) | |
1085 | unregister_netdevice_queue(dev, head); | |
1086 | ||
c5441932 PS |
1087 | for (h = 0; h < IP_TNL_HASH_SIZE; h++) { |
1088 | struct ip_tunnel *t; | |
1089 | struct hlist_node *n; | |
1090 | struct hlist_head *thead = &itn->tunnels[h]; | |
1091 | ||
1092 | hlist_for_each_entry_safe(t, n, thead, hash_node) | |
6c742e71 ND |
1093 | /* If dev is in the same netns, it has already |
1094 | * been added to the list by the previous loop. | |
1095 | */ | |
1096 | if (!net_eq(dev_net(t->dev), net)) | |
1097 | unregister_netdevice_queue(t->dev, head); | |
c5441932 | 1098 | } |
c5441932 PS |
1099 | } |
1100 | ||
64bc1781 ED |
1101 | void ip_tunnel_delete_nets(struct list_head *net_list, unsigned int id, |
1102 | struct rtnl_link_ops *ops) | |
c5441932 | 1103 | { |
64bc1781 ED |
1104 | struct ip_tunnel_net *itn; |
1105 | struct net *net; | |
c5441932 PS |
1106 | LIST_HEAD(list); |
1107 | ||
1108 | rtnl_lock(); | |
64bc1781 ED |
1109 | list_for_each_entry(net, net_list, exit_list) { |
1110 | itn = net_generic(net, id); | |
79134e6c | 1111 | ip_tunnel_destroy(net, itn, &list, ops); |
64bc1781 | 1112 | } |
c5441932 PS |
1113 | unregister_netdevice_many(&list); |
1114 | rtnl_unlock(); | |
c5441932 | 1115 | } |
64bc1781 | 1116 | EXPORT_SYMBOL_GPL(ip_tunnel_delete_nets); |
c5441932 PS |
1117 | |
1118 | int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[], | |
9830ad4c | 1119 | struct ip_tunnel_parm *p, __u32 fwmark) |
c5441932 PS |
1120 | { |
1121 | struct ip_tunnel *nt; | |
1122 | struct net *net = dev_net(dev); | |
1123 | struct ip_tunnel_net *itn; | |
1124 | int mtu; | |
1125 | int err; | |
1126 | ||
1127 | nt = netdev_priv(dev); | |
1128 | itn = net_generic(net, nt->ip_tnl_net_id); | |
1129 | ||
2e15ea39 PS |
1130 | if (nt->collect_md) { |
1131 | if (rtnl_dereference(itn->collect_md_tun)) | |
1132 | return -EEXIST; | |
1133 | } else { | |
1134 | if (ip_tunnel_find(itn, p, dev->type)) | |
1135 | return -EEXIST; | |
1136 | } | |
c5441932 | 1137 | |
5e6700b3 | 1138 | nt->net = net; |
c5441932 | 1139 | nt->parms = *p; |
9830ad4c | 1140 | nt->fwmark = fwmark; |
c5441932 PS |
1141 | err = register_netdevice(dev); |
1142 | if (err) | |
f6cc9c05 | 1143 | goto err_register_netdevice; |
c5441932 PS |
1144 | |
1145 | if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) | |
1146 | eth_hw_addr_random(dev); | |
1147 | ||
1148 | mtu = ip_tunnel_bind_dev(dev); | |
24fc7979 | 1149 | if (tb[IFLA_MTU]) { |
28e104d0 | 1150 | unsigned int max = IP_MAX_MTU - (nt->hlen + sizeof(struct iphdr)); |
24fc7979 | 1151 | |
28e104d0 | 1152 | mtu = clamp(dev->mtu, (unsigned int)ETH_MIN_MTU, max); |
f6cc9c05 | 1153 | } |
c5441932 | 1154 | |
5568cdc3 DM |
1155 | err = dev_set_mtu(dev, mtu); |
1156 | if (err) | |
1157 | goto err_dev_set_mtu; | |
c5441932 PS |
1158 | |
1159 | ip_tunnel_add(itn, nt); | |
f6cc9c05 PM |
1160 | return 0; |
1161 | ||
1162 | err_dev_set_mtu: | |
1163 | unregister_netdevice(dev); | |
1164 | err_register_netdevice: | |
c5441932 PS |
1165 | return err; |
1166 | } | |
1167 | EXPORT_SYMBOL_GPL(ip_tunnel_newlink); | |
1168 | ||
1169 | int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[], | |
9830ad4c | 1170 | struct ip_tunnel_parm *p, __u32 fwmark) |
c5441932 | 1171 | { |
6c742e71 | 1172 | struct ip_tunnel *t; |
c5441932 | 1173 | struct ip_tunnel *tunnel = netdev_priv(dev); |
6c742e71 | 1174 | struct net *net = tunnel->net; |
c5441932 PS |
1175 | struct ip_tunnel_net *itn = net_generic(net, tunnel->ip_tnl_net_id); |
1176 | ||
1177 | if (dev == itn->fb_tunnel_dev) | |
1178 | return -EINVAL; | |
1179 | ||
c5441932 PS |
1180 | t = ip_tunnel_find(itn, p, dev->type); |
1181 | ||
1182 | if (t) { | |
1183 | if (t->dev != dev) | |
1184 | return -EEXIST; | |
1185 | } else { | |
6c742e71 | 1186 | t = tunnel; |
c5441932 PS |
1187 | |
1188 | if (dev->type != ARPHRD_ETHER) { | |
1189 | unsigned int nflags = 0; | |
1190 | ||
1191 | if (ipv4_is_multicast(p->iph.daddr)) | |
1192 | nflags = IFF_BROADCAST; | |
1193 | else if (p->iph.daddr) | |
1194 | nflags = IFF_POINTOPOINT; | |
1195 | ||
1196 | if ((dev->flags ^ nflags) & | |
1197 | (IFF_POINTOPOINT | IFF_BROADCAST)) | |
1198 | return -EINVAL; | |
1199 | } | |
1200 | } | |
1201 | ||
9830ad4c | 1202 | ip_tunnel_update(itn, t, dev, p, !tb[IFLA_MTU], fwmark); |
c5441932 PS |
1203 | return 0; |
1204 | } | |
1205 | EXPORT_SYMBOL_GPL(ip_tunnel_changelink); | |
1206 | ||
1207 | int ip_tunnel_init(struct net_device *dev) | |
1208 | { | |
1209 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1210 | struct iphdr *iph = &tunnel->parms.iph; | |
1c213bd2 | 1211 | int err; |
c5441932 | 1212 | |
cf124db5 DM |
1213 | dev->needs_free_netdev = true; |
1214 | dev->priv_destructor = ip_tunnel_dev_free; | |
1c213bd2 | 1215 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
c5441932 PS |
1216 | if (!dev->tstats) |
1217 | return -ENOMEM; | |
1218 | ||
e09acddf PA |
1219 | err = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); |
1220 | if (err) { | |
9a4aa9af | 1221 | free_percpu(dev->tstats); |
e09acddf | 1222 | return err; |
9a4aa9af TH |
1223 | } |
1224 | ||
c5441932 PS |
1225 | err = gro_cells_init(&tunnel->gro_cells, dev); |
1226 | if (err) { | |
e09acddf | 1227 | dst_cache_destroy(&tunnel->dst_cache); |
c5441932 PS |
1228 | free_percpu(dev->tstats); |
1229 | return err; | |
1230 | } | |
1231 | ||
1232 | tunnel->dev = dev; | |
6c742e71 | 1233 | tunnel->net = dev_net(dev); |
c5441932 PS |
1234 | strcpy(tunnel->parms.name, dev->name); |
1235 | iph->version = 4; | |
1236 | iph->ihl = 5; | |
1237 | ||
d0f41851 | 1238 | if (tunnel->collect_md) |
2e15ea39 | 1239 | netif_keep_dst(dev); |
c5441932 PS |
1240 | return 0; |
1241 | } | |
1242 | EXPORT_SYMBOL_GPL(ip_tunnel_init); | |
1243 | ||
1244 | void ip_tunnel_uninit(struct net_device *dev) | |
1245 | { | |
c5441932 | 1246 | struct ip_tunnel *tunnel = netdev_priv(dev); |
6c742e71 | 1247 | struct net *net = tunnel->net; |
c5441932 PS |
1248 | struct ip_tunnel_net *itn; |
1249 | ||
1250 | itn = net_generic(net, tunnel->ip_tnl_net_id); | |
ba61539c TY |
1251 | ip_tunnel_del(itn, netdev_priv(dev)); |
1252 | if (itn->fb_tunnel_dev == dev) | |
1253 | WRITE_ONCE(itn->fb_tunnel_dev, NULL); | |
7d442fab | 1254 | |
e09acddf | 1255 | dst_cache_reset(&tunnel->dst_cache); |
c5441932 PS |
1256 | } |
1257 | EXPORT_SYMBOL_GPL(ip_tunnel_uninit); | |
1258 | ||
1259 | /* Do least required initialization, rest of init is done in tunnel_init call */ | |
c7d03a00 | 1260 | void ip_tunnel_setup(struct net_device *dev, unsigned int net_id) |
c5441932 PS |
1261 | { |
1262 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1263 | tunnel->ip_tnl_net_id = net_id; | |
1264 | } | |
1265 | EXPORT_SYMBOL_GPL(ip_tunnel_setup); | |
1266 | ||
1267 | MODULE_LICENSE("GPL"); |