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 | { | |
88 | unsigned int hash; | |
89 | struct ip_tunnel *t, *cand = NULL; | |
90 | struct hlist_head *head; | |
91 | ||
967680e0 | 92 | hash = ip_tunnel_hash(key, remote); |
c5441932 PS |
93 | head = &itn->tunnels[hash]; |
94 | ||
95 | hlist_for_each_entry_rcu(t, head, hash_node) { | |
96 | if (local != t->parms.iph.saddr || | |
97 | remote != t->parms.iph.daddr || | |
98 | !(t->dev->flags & IFF_UP)) | |
99 | continue; | |
100 | ||
101 | if (!ip_tunnel_key_match(&t->parms, flags, key)) | |
102 | continue; | |
103 | ||
104 | if (t->parms.link == link) | |
105 | return t; | |
106 | else | |
107 | cand = t; | |
108 | } | |
109 | ||
110 | hlist_for_each_entry_rcu(t, head, hash_node) { | |
111 | if (remote != t->parms.iph.daddr || | |
e0056593 | 112 | t->parms.iph.saddr != 0 || |
c5441932 PS |
113 | !(t->dev->flags & IFF_UP)) |
114 | continue; | |
115 | ||
116 | if (!ip_tunnel_key_match(&t->parms, flags, key)) | |
117 | continue; | |
118 | ||
119 | if (t->parms.link == link) | |
120 | return t; | |
121 | else if (!cand) | |
122 | cand = t; | |
123 | } | |
124 | ||
967680e0 | 125 | hash = ip_tunnel_hash(key, 0); |
c5441932 PS |
126 | head = &itn->tunnels[hash]; |
127 | ||
128 | hlist_for_each_entry_rcu(t, head, hash_node) { | |
e0056593 DP |
129 | if ((local != t->parms.iph.saddr || t->parms.iph.daddr != 0) && |
130 | (local != t->parms.iph.daddr || !ipv4_is_multicast(local))) | |
131 | continue; | |
132 | ||
133 | if (!(t->dev->flags & IFF_UP)) | |
c5441932 PS |
134 | continue; |
135 | ||
136 | if (!ip_tunnel_key_match(&t->parms, flags, key)) | |
137 | continue; | |
138 | ||
139 | if (t->parms.link == link) | |
140 | return t; | |
141 | else if (!cand) | |
142 | cand = t; | |
143 | } | |
144 | ||
145 | if (flags & TUNNEL_NO_KEY) | |
146 | goto skip_key_lookup; | |
147 | ||
148 | hlist_for_each_entry_rcu(t, head, hash_node) { | |
149 | if (t->parms.i_key != key || | |
e0056593 DP |
150 | t->parms.iph.saddr != 0 || |
151 | t->parms.iph.daddr != 0 || | |
c5441932 PS |
152 | !(t->dev->flags & IFF_UP)) |
153 | continue; | |
154 | ||
155 | if (t->parms.link == link) | |
156 | return t; | |
157 | else if (!cand) | |
158 | cand = t; | |
159 | } | |
160 | ||
161 | skip_key_lookup: | |
162 | if (cand) | |
163 | return cand; | |
164 | ||
2e15ea39 | 165 | t = rcu_dereference(itn->collect_md_tun); |
833a8b40 | 166 | if (t && t->dev->flags & IFF_UP) |
2e15ea39 PS |
167 | return t; |
168 | ||
c5441932 PS |
169 | if (itn->fb_tunnel_dev && itn->fb_tunnel_dev->flags & IFF_UP) |
170 | return netdev_priv(itn->fb_tunnel_dev); | |
171 | ||
c5441932 PS |
172 | return NULL; |
173 | } | |
174 | EXPORT_SYMBOL_GPL(ip_tunnel_lookup); | |
175 | ||
176 | static struct hlist_head *ip_bucket(struct ip_tunnel_net *itn, | |
177 | struct ip_tunnel_parm *parms) | |
178 | { | |
179 | unsigned int h; | |
180 | __be32 remote; | |
6d608f06 | 181 | __be32 i_key = parms->i_key; |
c5441932 PS |
182 | |
183 | if (parms->iph.daddr && !ipv4_is_multicast(parms->iph.daddr)) | |
184 | remote = parms->iph.daddr; | |
185 | else | |
186 | remote = 0; | |
187 | ||
6d608f06 SK |
188 | if (!(parms->i_flags & TUNNEL_KEY) && (parms->i_flags & VTI_ISVTI)) |
189 | i_key = 0; | |
190 | ||
191 | h = ip_tunnel_hash(i_key, remote); | |
c5441932 PS |
192 | return &itn->tunnels[h]; |
193 | } | |
194 | ||
195 | static void ip_tunnel_add(struct ip_tunnel_net *itn, struct ip_tunnel *t) | |
196 | { | |
197 | struct hlist_head *head = ip_bucket(itn, &t->parms); | |
198 | ||
2e15ea39 PS |
199 | if (t->collect_md) |
200 | rcu_assign_pointer(itn->collect_md_tun, t); | |
c5441932 PS |
201 | hlist_add_head_rcu(&t->hash_node, head); |
202 | } | |
203 | ||
2e15ea39 | 204 | static void ip_tunnel_del(struct ip_tunnel_net *itn, struct ip_tunnel *t) |
c5441932 | 205 | { |
2e15ea39 PS |
206 | if (t->collect_md) |
207 | rcu_assign_pointer(itn->collect_md_tun, NULL); | |
c5441932 PS |
208 | hlist_del_init_rcu(&t->hash_node); |
209 | } | |
210 | ||
211 | static struct ip_tunnel *ip_tunnel_find(struct ip_tunnel_net *itn, | |
212 | struct ip_tunnel_parm *parms, | |
213 | int type) | |
214 | { | |
215 | __be32 remote = parms->iph.daddr; | |
216 | __be32 local = parms->iph.saddr; | |
217 | __be32 key = parms->i_key; | |
5ce54af1 | 218 | __be16 flags = parms->i_flags; |
c5441932 PS |
219 | int link = parms->link; |
220 | struct ip_tunnel *t = NULL; | |
221 | struct hlist_head *head = ip_bucket(itn, parms); | |
222 | ||
223 | hlist_for_each_entry_rcu(t, head, hash_node) { | |
224 | if (local == t->parms.iph.saddr && | |
225 | remote == t->parms.iph.daddr && | |
c5441932 | 226 | link == t->parms.link && |
5ce54af1 DP |
227 | type == t->dev->type && |
228 | ip_tunnel_key_match(&t->parms, flags, key)) | |
c5441932 PS |
229 | break; |
230 | } | |
231 | return t; | |
232 | } | |
233 | ||
234 | static struct net_device *__ip_tunnel_create(struct net *net, | |
235 | const struct rtnl_link_ops *ops, | |
236 | struct ip_tunnel_parm *parms) | |
237 | { | |
238 | int err; | |
239 | struct ip_tunnel *tunnel; | |
240 | struct net_device *dev; | |
241 | char name[IFNAMSIZ]; | |
242 | ||
9cb726a2 ED |
243 | err = -E2BIG; |
244 | if (parms->name[0]) { | |
245 | if (!dev_valid_name(parms->name)) | |
246 | goto failed; | |
c5441932 | 247 | strlcpy(name, parms->name, IFNAMSIZ); |
9cb726a2 ED |
248 | } else { |
249 | if (strlen(ops->kind) > (IFNAMSIZ - 3)) | |
c5441932 | 250 | goto failed; |
000ade80 SA |
251 | strcpy(name, ops->kind); |
252 | strcat(name, "%d"); | |
c5441932 PS |
253 | } |
254 | ||
255 | ASSERT_RTNL(); | |
c835a677 | 256 | dev = alloc_netdev(ops->priv_size, name, NET_NAME_UNKNOWN, ops->setup); |
c5441932 PS |
257 | if (!dev) { |
258 | err = -ENOMEM; | |
259 | goto failed; | |
260 | } | |
261 | dev_net_set(dev, net); | |
262 | ||
263 | dev->rtnl_link_ops = ops; | |
264 | ||
265 | tunnel = netdev_priv(dev); | |
266 | tunnel->parms = *parms; | |
5e6700b3 | 267 | tunnel->net = net; |
c5441932 PS |
268 | |
269 | err = register_netdevice(dev); | |
270 | if (err) | |
271 | goto failed_free; | |
272 | ||
273 | return dev; | |
274 | ||
275 | failed_free: | |
276 | free_netdev(dev); | |
277 | failed: | |
278 | return ERR_PTR(err); | |
279 | } | |
280 | ||
c5441932 PS |
281 | static int ip_tunnel_bind_dev(struct net_device *dev) |
282 | { | |
283 | struct net_device *tdev = NULL; | |
284 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
285 | const struct iphdr *iph; | |
286 | int hlen = LL_MAX_HEADER; | |
287 | int mtu = ETH_DATA_LEN; | |
288 | int t_hlen = tunnel->hlen + sizeof(struct iphdr); | |
289 | ||
290 | iph = &tunnel->parms.iph; | |
291 | ||
292 | /* Guess output device to choose reasonable mtu and needed_headroom */ | |
293 | if (iph->daddr) { | |
294 | struct flowi4 fl4; | |
295 | struct rtable *rt; | |
296 | ||
b0066da5 PM |
297 | ip_tunnel_init_flow(&fl4, iph->protocol, iph->daddr, |
298 | iph->saddr, tunnel->parms.o_key, | |
299 | RT_TOS(iph->tos), tunnel->parms.link, | |
24ba1440 | 300 | tunnel->fwmark, 0); |
7d442fab TH |
301 | rt = ip_route_output_key(tunnel->net, &fl4); |
302 | ||
c5441932 PS |
303 | if (!IS_ERR(rt)) { |
304 | tdev = rt->dst.dev; | |
305 | ip_rt_put(rt); | |
306 | } | |
307 | if (dev->type != ARPHRD_ETHER) | |
308 | dev->flags |= IFF_POINTOPOINT; | |
f27337e1 PA |
309 | |
310 | dst_cache_reset(&tunnel->dst_cache); | |
c5441932 PS |
311 | } |
312 | ||
313 | if (!tdev && tunnel->parms.link) | |
6c742e71 | 314 | tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link); |
c5441932 PS |
315 | |
316 | if (tdev) { | |
317 | hlen = tdev->hard_header_len + tdev->needed_headroom; | |
82612de1 | 318 | mtu = min(tdev->mtu, IP_MAX_MTU); |
c5441932 | 319 | } |
c5441932 PS |
320 | |
321 | dev->needed_headroom = t_hlen + hlen; | |
322 | mtu -= (dev->hard_header_len + t_hlen); | |
323 | ||
b5476022 ED |
324 | if (mtu < IPV4_MIN_MTU) |
325 | mtu = IPV4_MIN_MTU; | |
c5441932 PS |
326 | |
327 | return mtu; | |
328 | } | |
329 | ||
330 | static struct ip_tunnel *ip_tunnel_create(struct net *net, | |
331 | struct ip_tunnel_net *itn, | |
332 | struct ip_tunnel_parm *parms) | |
333 | { | |
4929fd8c | 334 | struct ip_tunnel *nt; |
c5441932 | 335 | struct net_device *dev; |
b96f9afe | 336 | int t_hlen; |
f6cc9c05 PM |
337 | int mtu; |
338 | int err; | |
c5441932 | 339 | |
79134e6c | 340 | dev = __ip_tunnel_create(net, itn->rtnl_link_ops, parms); |
c5441932 | 341 | if (IS_ERR(dev)) |
6dd3c9ec | 342 | return ERR_CAST(dev); |
c5441932 | 343 | |
f6cc9c05 PM |
344 | mtu = ip_tunnel_bind_dev(dev); |
345 | err = dev_set_mtu(dev, mtu); | |
346 | if (err) | |
347 | goto err_dev_set_mtu; | |
c5441932 PS |
348 | |
349 | nt = netdev_priv(dev); | |
b96f9afe JW |
350 | t_hlen = nt->hlen + sizeof(struct iphdr); |
351 | dev->min_mtu = ETH_MIN_MTU; | |
82612de1 | 352 | dev->max_mtu = IP_MAX_MTU - dev->hard_header_len - t_hlen; |
c5441932 PS |
353 | ip_tunnel_add(itn, nt); |
354 | return nt; | |
f6cc9c05 PM |
355 | |
356 | err_dev_set_mtu: | |
357 | unregister_netdevice(dev); | |
358 | return ERR_PTR(err); | |
c5441932 PS |
359 | } |
360 | ||
361 | int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb, | |
2e15ea39 PS |
362 | const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst, |
363 | bool log_ecn_error) | |
c5441932 | 364 | { |
8f84985f | 365 | struct pcpu_sw_netstats *tstats; |
c5441932 PS |
366 | const struct iphdr *iph = ip_hdr(skb); |
367 | int err; | |
368 | ||
c5441932 PS |
369 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
370 | if (ipv4_is_multicast(iph->daddr)) { | |
c5441932 PS |
371 | tunnel->dev->stats.multicast++; |
372 | skb->pkt_type = PACKET_BROADCAST; | |
373 | } | |
374 | #endif | |
375 | ||
376 | if ((!(tpi->flags&TUNNEL_CSUM) && (tunnel->parms.i_flags&TUNNEL_CSUM)) || | |
377 | ((tpi->flags&TUNNEL_CSUM) && !(tunnel->parms.i_flags&TUNNEL_CSUM))) { | |
378 | tunnel->dev->stats.rx_crc_errors++; | |
379 | tunnel->dev->stats.rx_errors++; | |
380 | goto drop; | |
381 | } | |
382 | ||
383 | if (tunnel->parms.i_flags&TUNNEL_SEQ) { | |
384 | if (!(tpi->flags&TUNNEL_SEQ) || | |
385 | (tunnel->i_seqno && (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) { | |
386 | tunnel->dev->stats.rx_fifo_errors++; | |
387 | tunnel->dev->stats.rx_errors++; | |
388 | goto drop; | |
389 | } | |
390 | tunnel->i_seqno = ntohl(tpi->seq) + 1; | |
391 | } | |
392 | ||
e96f2e7c YC |
393 | skb_reset_network_header(skb); |
394 | ||
c5441932 PS |
395 | err = IP_ECN_decapsulate(iph, skb); |
396 | if (unlikely(err)) { | |
397 | if (log_ecn_error) | |
398 | net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", | |
399 | &iph->saddr, iph->tos); | |
400 | if (err > 1) { | |
401 | ++tunnel->dev->stats.rx_frame_errors; | |
402 | ++tunnel->dev->stats.rx_errors; | |
403 | goto drop; | |
404 | } | |
405 | } | |
406 | ||
407 | tstats = this_cpu_ptr(tunnel->dev->tstats); | |
408 | u64_stats_update_begin(&tstats->syncp); | |
409 | tstats->rx_packets++; | |
410 | tstats->rx_bytes += skb->len; | |
411 | u64_stats_update_end(&tstats->syncp); | |
412 | ||
81b9eab5 AS |
413 | skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev))); |
414 | ||
3d7b46cd PS |
415 | if (tunnel->dev->type == ARPHRD_ETHER) { |
416 | skb->protocol = eth_type_trans(skb, tunnel->dev); | |
417 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); | |
418 | } else { | |
419 | skb->dev = tunnel->dev; | |
420 | } | |
64261f23 | 421 | |
2e15ea39 PS |
422 | if (tun_dst) |
423 | skb_dst_set(skb, (struct dst_entry *)tun_dst); | |
424 | ||
c5441932 PS |
425 | gro_cells_receive(&tunnel->gro_cells, skb); |
426 | return 0; | |
427 | ||
428 | drop: | |
469f87e1 HY |
429 | if (tun_dst) |
430 | dst_release((struct dst_entry *)tun_dst); | |
c5441932 PS |
431 | kfree_skb(skb); |
432 | return 0; | |
433 | } | |
434 | EXPORT_SYMBOL_GPL(ip_tunnel_rcv); | |
435 | ||
a8c5f90f TH |
436 | int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *ops, |
437 | unsigned int num) | |
438 | { | |
bb1553c8 TG |
439 | if (num >= MAX_IPTUN_ENCAP_OPS) |
440 | return -ERANGE; | |
441 | ||
a8c5f90f TH |
442 | return !cmpxchg((const struct ip_tunnel_encap_ops **) |
443 | &iptun_encaps[num], | |
444 | NULL, ops) ? 0 : -1; | |
56328486 | 445 | } |
a8c5f90f TH |
446 | EXPORT_SYMBOL(ip_tunnel_encap_add_ops); |
447 | ||
448 | int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *ops, | |
449 | unsigned int num) | |
450 | { | |
451 | int ret; | |
452 | ||
bb1553c8 TG |
453 | if (num >= MAX_IPTUN_ENCAP_OPS) |
454 | return -ERANGE; | |
455 | ||
a8c5f90f TH |
456 | ret = (cmpxchg((const struct ip_tunnel_encap_ops **) |
457 | &iptun_encaps[num], | |
458 | ops, NULL) == ops) ? 0 : -1; | |
459 | ||
460 | synchronize_net(); | |
461 | ||
462 | return ret; | |
463 | } | |
464 | EXPORT_SYMBOL(ip_tunnel_encap_del_ops); | |
56328486 TH |
465 | |
466 | int ip_tunnel_encap_setup(struct ip_tunnel *t, | |
467 | struct ip_tunnel_encap *ipencap) | |
468 | { | |
469 | int hlen; | |
470 | ||
471 | memset(&t->encap, 0, sizeof(t->encap)); | |
472 | ||
473 | hlen = ip_encap_hlen(ipencap); | |
474 | if (hlen < 0) | |
475 | return hlen; | |
476 | ||
477 | t->encap.type = ipencap->type; | |
478 | t->encap.sport = ipencap->sport; | |
479 | t->encap.dport = ipencap->dport; | |
480 | t->encap.flags = ipencap->flags; | |
481 | ||
482 | t->encap_hlen = hlen; | |
483 | t->hlen = t->encap_hlen + t->tun_hlen; | |
484 | ||
485 | return 0; | |
486 | } | |
487 | EXPORT_SYMBOL_GPL(ip_tunnel_encap_setup); | |
488 | ||
23a3647b | 489 | static int tnl_update_pmtu(struct net_device *dev, struct sk_buff *skb, |
fc24f2b2 | 490 | struct rtable *rt, __be16 df, |
c8b34e68 | 491 | const struct iphdr *inner_iph, |
492 | int tunnel_hlen, __be32 dst, bool md) | |
23a3647b PS |
493 | { |
494 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
c8b34e68 | 495 | int pkt_size; |
23a3647b PS |
496 | int mtu; |
497 | ||
c8b34e68 | 498 | tunnel_hlen = md ? tunnel_hlen : tunnel->hlen; |
499 | pkt_size = skb->len - tunnel_hlen - dev->hard_header_len; | |
500 | ||
23a3647b PS |
501 | if (df) |
502 | mtu = dst_mtu(&rt->dst) - dev->hard_header_len | |
c8b34e68 | 503 | - sizeof(struct iphdr) - tunnel_hlen; |
23a3647b | 504 | else |
f4b3ec4e | 505 | mtu = skb_valid_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu; |
23a3647b | 506 | |
f4b3ec4e AM |
507 | if (skb_valid_dst(skb)) |
508 | skb_dst_update_pmtu(skb, mtu); | |
23a3647b PS |
509 | |
510 | if (skb->protocol == htons(ETH_P_IP)) { | |
511 | if (!skb_is_gso(skb) && | |
fc24f2b2 TT |
512 | (inner_iph->frag_off & htons(IP_DF)) && |
513 | mtu < pkt_size) { | |
23a3647b PS |
514 | memset(IPCB(skb), 0, sizeof(*IPCB(skb))); |
515 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); | |
516 | return -E2BIG; | |
517 | } | |
518 | } | |
519 | #if IS_ENABLED(CONFIG_IPV6) | |
520 | else if (skb->protocol == htons(ETH_P_IPV6)) { | |
f4b3ec4e | 521 | struct rt6_info *rt6; |
c8b34e68 | 522 | __be32 daddr; |
523 | ||
f4b3ec4e AM |
524 | rt6 = skb_valid_dst(skb) ? (struct rt6_info *)skb_dst(skb) : |
525 | NULL; | |
c8b34e68 | 526 | daddr = md ? dst : tunnel->parms.iph.daddr; |
23a3647b PS |
527 | |
528 | if (rt6 && mtu < dst_mtu(skb_dst(skb)) && | |
529 | mtu >= IPV6_MIN_MTU) { | |
c8b34e68 | 530 | if ((daddr && !ipv4_is_multicast(daddr)) || |
23a3647b PS |
531 | rt6->rt6i_dst.plen == 128) { |
532 | rt6->rt6i_flags |= RTF_MODIFIED; | |
533 | dst_metric_set(skb_dst(skb), RTAX_MTU, mtu); | |
534 | } | |
535 | } | |
536 | ||
537 | if (!skb_is_gso(skb) && mtu >= IPV6_MIN_MTU && | |
538 | mtu < pkt_size) { | |
539 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); | |
540 | return -E2BIG; | |
541 | } | |
542 | } | |
543 | #endif | |
544 | return 0; | |
545 | } | |
546 | ||
c8b34e68 | 547 | void ip_md_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, |
548 | u8 proto, int tunnel_hlen) | |
cfc7381b AS |
549 | { |
550 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
551 | u32 headroom = sizeof(struct iphdr); | |
552 | struct ip_tunnel_info *tun_info; | |
553 | const struct ip_tunnel_key *key; | |
554 | const struct iphdr *inner_iph; | |
f46fe4f8 | 555 | struct rtable *rt = NULL; |
cfc7381b AS |
556 | struct flowi4 fl4; |
557 | __be16 df = 0; | |
558 | u8 tos, ttl; | |
f46fe4f8 | 559 | bool use_cache; |
cfc7381b AS |
560 | |
561 | tun_info = skb_tunnel_info(skb); | |
562 | if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) || | |
563 | ip_tunnel_info_af(tun_info) != AF_INET)) | |
564 | goto tx_error; | |
565 | key = &tun_info->key; | |
566 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); | |
567 | inner_iph = (const struct iphdr *)skb_inner_network_header(skb); | |
568 | tos = key->tos; | |
569 | if (tos == 1) { | |
570 | if (skb->protocol == htons(ETH_P_IP)) | |
571 | tos = inner_iph->tos; | |
572 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
573 | tos = ipv6_get_dsfield((const struct ipv6hdr *)inner_iph); | |
574 | } | |
6e6b904a | 575 | ip_tunnel_init_flow(&fl4, proto, key->u.ipv4.dst, key->u.ipv4.src, |
576 | tunnel_id_to_key32(key->tun_id), RT_TOS(tos), | |
24ba1440 | 577 | 0, skb->mark, skb_get_hash(skb)); |
cfc7381b AS |
578 | if (tunnel->encap.type != TUNNEL_ENCAP_NONE) |
579 | goto tx_error; | |
f46fe4f8 | 580 | |
581 | use_cache = ip_tunnel_dst_cache_usable(skb, tun_info); | |
582 | if (use_cache) | |
583 | rt = dst_cache_get_ip4(&tun_info->dst_cache, &fl4.saddr); | |
584 | if (!rt) { | |
585 | rt = ip_route_output_key(tunnel->net, &fl4); | |
586 | if (IS_ERR(rt)) { | |
587 | dev->stats.tx_carrier_errors++; | |
588 | goto tx_error; | |
589 | } | |
590 | if (use_cache) | |
591 | dst_cache_set_ip4(&tun_info->dst_cache, &rt->dst, | |
592 | fl4.saddr); | |
cfc7381b AS |
593 | } |
594 | if (rt->dst.dev == dev) { | |
595 | ip_rt_put(rt); | |
596 | dev->stats.collisions++; | |
597 | goto tx_error; | |
598 | } | |
c8b34e68 | 599 | |
600 | if (key->tun_flags & TUNNEL_DONT_FRAGMENT) | |
601 | df = htons(IP_DF); | |
602 | if (tnl_update_pmtu(dev, skb, rt, df, inner_iph, tunnel_hlen, | |
603 | key->u.ipv4.dst, true)) { | |
604 | ip_rt_put(rt); | |
605 | goto tx_error; | |
606 | } | |
607 | ||
cfc7381b AS |
608 | tos = ip_tunnel_ecn_encap(tos, inner_iph, skb); |
609 | ttl = key->ttl; | |
610 | if (ttl == 0) { | |
611 | if (skb->protocol == htons(ETH_P_IP)) | |
612 | ttl = inner_iph->ttl; | |
613 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
614 | ttl = ((const struct ipv6hdr *)inner_iph)->hop_limit; | |
615 | else | |
616 | ttl = ip4_dst_hoplimit(&rt->dst); | |
617 | } | |
c8b34e68 | 618 | |
619 | if (!df && skb->protocol == htons(ETH_P_IP)) | |
cfc7381b | 620 | df = inner_iph->frag_off & htons(IP_DF); |
c8b34e68 | 621 | |
cfc7381b AS |
622 | headroom += LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len; |
623 | if (headroom > dev->needed_headroom) | |
624 | dev->needed_headroom = headroom; | |
625 | ||
626 | if (skb_cow_head(skb, dev->needed_headroom)) { | |
627 | ip_rt_put(rt); | |
628 | goto tx_dropped; | |
629 | } | |
0f693f19 HY |
630 | iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, proto, tos, ttl, |
631 | df, !net_eq(tunnel->net, dev_net(dev))); | |
cfc7381b AS |
632 | return; |
633 | tx_error: | |
634 | dev->stats.tx_errors++; | |
635 | goto kfree; | |
636 | tx_dropped: | |
637 | dev->stats.tx_dropped++; | |
638 | kfree: | |
639 | kfree_skb(skb); | |
640 | } | |
641 | EXPORT_SYMBOL_GPL(ip_md_tunnel_xmit); | |
642 | ||
c5441932 | 643 | void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, |
56328486 | 644 | const struct iphdr *tnl_params, u8 protocol) |
c5441932 PS |
645 | { |
646 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
186d9366 | 647 | struct ip_tunnel_info *tun_info = NULL; |
c5441932 | 648 | const struct iphdr *inner_iph; |
c5441932 | 649 | unsigned int max_headroom; /* The extra header space needed */ |
186d9366 | 650 | struct rtable *rt = NULL; /* Route to the other host */ |
651 | bool use_cache = false; | |
652 | struct flowi4 fl4; | |
653 | bool md = false; | |
22fb22ea | 654 | bool connected; |
186d9366 | 655 | u8 tos, ttl; |
656 | __be32 dst; | |
657 | __be16 df; | |
c5441932 PS |
658 | |
659 | inner_iph = (const struct iphdr *)skb_inner_network_header(skb); | |
22fb22ea | 660 | connected = (tunnel->parms.iph.daddr != 0); |
c5441932 | 661 | |
5146d1f1 BH |
662 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
663 | ||
c5441932 PS |
664 | dst = tnl_params->daddr; |
665 | if (dst == 0) { | |
666 | /* NBMA tunnel */ | |
667 | ||
51456b29 | 668 | if (!skb_dst(skb)) { |
c5441932 PS |
669 | dev->stats.tx_fifo_errors++; |
670 | goto tx_error; | |
671 | } | |
672 | ||
d71b5753 | 673 | tun_info = skb_tunnel_info(skb); |
674 | if (tun_info && (tun_info->mode & IP_TUNNEL_INFO_TX) && | |
675 | ip_tunnel_info_af(tun_info) == AF_INET && | |
186d9366 | 676 | tun_info->key.u.ipv4.dst) { |
d71b5753 | 677 | dst = tun_info->key.u.ipv4.dst; |
186d9366 | 678 | md = true; |
679 | connected = true; | |
680 | } | |
d71b5753 | 681 | else if (skb->protocol == htons(ETH_P_IP)) { |
c5441932 PS |
682 | rt = skb_rtable(skb); |
683 | dst = rt_nexthop(rt, inner_iph->daddr); | |
684 | } | |
685 | #if IS_ENABLED(CONFIG_IPV6) | |
686 | else if (skb->protocol == htons(ETH_P_IPV6)) { | |
687 | const struct in6_addr *addr6; | |
688 | struct neighbour *neigh; | |
689 | bool do_tx_error_icmp; | |
690 | int addr_type; | |
691 | ||
692 | neigh = dst_neigh_lookup(skb_dst(skb), | |
693 | &ipv6_hdr(skb)->daddr); | |
51456b29 | 694 | if (!neigh) |
c5441932 PS |
695 | goto tx_error; |
696 | ||
697 | addr6 = (const struct in6_addr *)&neigh->primary_key; | |
698 | addr_type = ipv6_addr_type(addr6); | |
699 | ||
700 | if (addr_type == IPV6_ADDR_ANY) { | |
701 | addr6 = &ipv6_hdr(skb)->daddr; | |
702 | addr_type = ipv6_addr_type(addr6); | |
703 | } | |
704 | ||
705 | if ((addr_type & IPV6_ADDR_COMPATv4) == 0) | |
706 | do_tx_error_icmp = true; | |
707 | else { | |
708 | do_tx_error_icmp = false; | |
709 | dst = addr6->s6_addr32[3]; | |
710 | } | |
711 | neigh_release(neigh); | |
712 | if (do_tx_error_icmp) | |
713 | goto tx_error_icmp; | |
714 | } | |
715 | #endif | |
716 | else | |
717 | goto tx_error; | |
7d442fab | 718 | |
186d9366 | 719 | if (!md) |
720 | connected = false; | |
c5441932 PS |
721 | } |
722 | ||
723 | tos = tnl_params->tos; | |
724 | if (tos & 0x1) { | |
725 | tos &= ~0x1; | |
7d442fab | 726 | if (skb->protocol == htons(ETH_P_IP)) { |
c5441932 | 727 | tos = inner_iph->tos; |
7d442fab TH |
728 | connected = false; |
729 | } else if (skb->protocol == htons(ETH_P_IPV6)) { | |
c5441932 | 730 | tos = ipv6_get_dsfield((const struct ipv6hdr *)inner_iph); |
7d442fab TH |
731 | connected = false; |
732 | } | |
c5441932 PS |
733 | } |
734 | ||
0f3e9c97 DM |
735 | ip_tunnel_init_flow(&fl4, protocol, dst, tnl_params->saddr, |
736 | tunnel->parms.o_key, RT_TOS(tos), tunnel->parms.link, | |
24ba1440 | 737 | tunnel->fwmark, skb_get_hash(skb)); |
7d442fab | 738 | |
56328486 TH |
739 | if (ip_tunnel_encap(skb, tunnel, &protocol, &fl4) < 0) |
740 | goto tx_error; | |
741 | ||
186d9366 | 742 | if (connected && md) { |
743 | use_cache = ip_tunnel_dst_cache_usable(skb, tun_info); | |
744 | if (use_cache) | |
745 | rt = dst_cache_get_ip4(&tun_info->dst_cache, | |
746 | &fl4.saddr); | |
747 | } else { | |
748 | rt = connected ? dst_cache_get_ip4(&tunnel->dst_cache, | |
749 | &fl4.saddr) : NULL; | |
750 | } | |
7d442fab TH |
751 | |
752 | if (!rt) { | |
753 | rt = ip_route_output_key(tunnel->net, &fl4); | |
754 | ||
755 | if (IS_ERR(rt)) { | |
756 | dev->stats.tx_carrier_errors++; | |
757 | goto tx_error; | |
758 | } | |
186d9366 | 759 | if (use_cache) |
760 | dst_cache_set_ip4(&tun_info->dst_cache, &rt->dst, | |
761 | fl4.saddr); | |
762 | else if (!md && connected) | |
e09acddf PA |
763 | dst_cache_set_ip4(&tunnel->dst_cache, &rt->dst, |
764 | fl4.saddr); | |
c5441932 | 765 | } |
7d442fab | 766 | |
0e6fbc5b | 767 | if (rt->dst.dev == dev) { |
c5441932 PS |
768 | ip_rt_put(rt); |
769 | dev->stats.collisions++; | |
770 | goto tx_error; | |
771 | } | |
c5441932 | 772 | |
c8b34e68 | 773 | if (tnl_update_pmtu(dev, skb, rt, tnl_params->frag_off, inner_iph, |
774 | 0, 0, false)) { | |
23a3647b PS |
775 | ip_rt_put(rt); |
776 | goto tx_error; | |
c5441932 | 777 | } |
c5441932 PS |
778 | |
779 | if (tunnel->err_count > 0) { | |
780 | if (time_before(jiffies, | |
781 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
782 | tunnel->err_count--; | |
783 | ||
784 | dst_link_failure(skb); | |
785 | } else | |
786 | tunnel->err_count = 0; | |
787 | } | |
788 | ||
d4a71b15 | 789 | tos = ip_tunnel_ecn_encap(tos, inner_iph, skb); |
c5441932 PS |
790 | ttl = tnl_params->ttl; |
791 | if (ttl == 0) { | |
792 | if (skb->protocol == htons(ETH_P_IP)) | |
793 | ttl = inner_iph->ttl; | |
794 | #if IS_ENABLED(CONFIG_IPV6) | |
795 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
796 | ttl = ((const struct ipv6hdr *)inner_iph)->hop_limit; | |
797 | #endif | |
798 | else | |
799 | ttl = ip4_dst_hoplimit(&rt->dst); | |
800 | } | |
801 | ||
23a3647b | 802 | df = tnl_params->frag_off; |
22a59be8 | 803 | if (skb->protocol == htons(ETH_P_IP) && !tunnel->ignore_df) |
23a3647b PS |
804 | df |= (inner_iph->frag_off&htons(IP_DF)); |
805 | ||
0e6fbc5b | 806 | max_headroom = LL_RESERVED_SPACE(rt->dst.dev) + sizeof(struct iphdr) |
7371e022 | 807 | + rt->dst.header_len + ip_encap_hlen(&tunnel->encap); |
3e08f4a7 | 808 | if (max_headroom > dev->needed_headroom) |
c5441932 | 809 | dev->needed_headroom = max_headroom; |
3e08f4a7 SK |
810 | |
811 | if (skb_cow_head(skb, dev->needed_headroom)) { | |
586d5fc8 | 812 | ip_rt_put(rt); |
3e08f4a7 | 813 | dev->stats.tx_dropped++; |
3acfa1e7 | 814 | kfree_skb(skb); |
3e08f4a7 | 815 | return; |
c5441932 PS |
816 | } |
817 | ||
039f5062 PS |
818 | iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, protocol, tos, ttl, |
819 | df, !net_eq(tunnel->net, dev_net(dev))); | |
c5441932 PS |
820 | return; |
821 | ||
822 | #if IS_ENABLED(CONFIG_IPV6) | |
823 | tx_error_icmp: | |
824 | dst_link_failure(skb); | |
825 | #endif | |
826 | tx_error: | |
827 | dev->stats.tx_errors++; | |
3acfa1e7 | 828 | kfree_skb(skb); |
c5441932 PS |
829 | } |
830 | EXPORT_SYMBOL_GPL(ip_tunnel_xmit); | |
831 | ||
832 | static void ip_tunnel_update(struct ip_tunnel_net *itn, | |
833 | struct ip_tunnel *t, | |
834 | struct net_device *dev, | |
835 | struct ip_tunnel_parm *p, | |
9830ad4c CG |
836 | bool set_mtu, |
837 | __u32 fwmark) | |
c5441932 | 838 | { |
2e15ea39 | 839 | ip_tunnel_del(itn, t); |
c5441932 PS |
840 | t->parms.iph.saddr = p->iph.saddr; |
841 | t->parms.iph.daddr = p->iph.daddr; | |
842 | t->parms.i_key = p->i_key; | |
843 | t->parms.o_key = p->o_key; | |
844 | if (dev->type != ARPHRD_ETHER) { | |
845 | memcpy(dev->dev_addr, &p->iph.saddr, 4); | |
846 | memcpy(dev->broadcast, &p->iph.daddr, 4); | |
847 | } | |
848 | ip_tunnel_add(itn, t); | |
849 | ||
850 | t->parms.iph.ttl = p->iph.ttl; | |
851 | t->parms.iph.tos = p->iph.tos; | |
852 | t->parms.iph.frag_off = p->iph.frag_off; | |
853 | ||
9830ad4c | 854 | if (t->parms.link != p->link || t->fwmark != fwmark) { |
c5441932 PS |
855 | int mtu; |
856 | ||
857 | t->parms.link = p->link; | |
9830ad4c | 858 | t->fwmark = fwmark; |
c5441932 PS |
859 | mtu = ip_tunnel_bind_dev(dev); |
860 | if (set_mtu) | |
861 | dev->mtu = mtu; | |
862 | } | |
e09acddf | 863 | dst_cache_reset(&t->dst_cache); |
c5441932 PS |
864 | netdev_state_change(dev); |
865 | } | |
866 | ||
867 | int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd) | |
868 | { | |
869 | int err = 0; | |
8c923ce2 ND |
870 | struct ip_tunnel *t = netdev_priv(dev); |
871 | struct net *net = t->net; | |
872 | struct ip_tunnel_net *itn = net_generic(net, t->ip_tnl_net_id); | |
c5441932 | 873 | |
c5441932 PS |
874 | switch (cmd) { |
875 | case SIOCGETTUNNEL: | |
8c923ce2 | 876 | if (dev == itn->fb_tunnel_dev) { |
c5441932 | 877 | t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type); |
51456b29 | 878 | if (!t) |
8c923ce2 ND |
879 | t = netdev_priv(dev); |
880 | } | |
c5441932 PS |
881 | memcpy(p, &t->parms, sizeof(*p)); |
882 | break; | |
883 | ||
884 | case SIOCADDTUNNEL: | |
885 | case SIOCCHGTUNNEL: | |
886 | err = -EPERM; | |
887 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
888 | goto done; | |
889 | if (p->iph.ttl) | |
890 | p->iph.frag_off |= htons(IP_DF); | |
7c8e6b9c DP |
891 | if (!(p->i_flags & VTI_ISVTI)) { |
892 | if (!(p->i_flags & TUNNEL_KEY)) | |
893 | p->i_key = 0; | |
894 | if (!(p->o_flags & TUNNEL_KEY)) | |
895 | p->o_key = 0; | |
896 | } | |
c5441932 | 897 | |
79134e6c | 898 | t = ip_tunnel_find(itn, p, itn->type); |
c5441932 | 899 | |
d61746b2 SK |
900 | if (cmd == SIOCADDTUNNEL) { |
901 | if (!t) { | |
902 | t = ip_tunnel_create(net, itn, p); | |
903 | err = PTR_ERR_OR_ZERO(t); | |
904 | break; | |
905 | } | |
906 | ||
907 | err = -EEXIST; | |
ee30ef4d | 908 | break; |
6dd3c9ec | 909 | } |
c5441932 | 910 | if (dev != itn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
00db4124 | 911 | if (t) { |
c5441932 PS |
912 | if (t->dev != dev) { |
913 | err = -EEXIST; | |
914 | break; | |
915 | } | |
916 | } else { | |
917 | unsigned int nflags = 0; | |
918 | ||
919 | if (ipv4_is_multicast(p->iph.daddr)) | |
920 | nflags = IFF_BROADCAST; | |
921 | else if (p->iph.daddr) | |
922 | nflags = IFF_POINTOPOINT; | |
923 | ||
924 | if ((dev->flags^nflags)&(IFF_POINTOPOINT|IFF_BROADCAST)) { | |
925 | err = -EINVAL; | |
926 | break; | |
927 | } | |
928 | ||
929 | t = netdev_priv(dev); | |
930 | } | |
931 | } | |
932 | ||
933 | if (t) { | |
934 | err = 0; | |
9830ad4c | 935 | ip_tunnel_update(itn, t, dev, p, true, 0); |
6dd3c9ec FW |
936 | } else { |
937 | err = -ENOENT; | |
938 | } | |
c5441932 PS |
939 | break; |
940 | ||
941 | case SIOCDELTUNNEL: | |
942 | err = -EPERM; | |
943 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
944 | goto done; | |
945 | ||
946 | if (dev == itn->fb_tunnel_dev) { | |
947 | err = -ENOENT; | |
948 | t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type); | |
51456b29 | 949 | if (!t) |
c5441932 PS |
950 | goto done; |
951 | err = -EPERM; | |
952 | if (t == netdev_priv(itn->fb_tunnel_dev)) | |
953 | goto done; | |
954 | dev = t->dev; | |
955 | } | |
956 | unregister_netdevice(dev); | |
957 | err = 0; | |
958 | break; | |
959 | ||
960 | default: | |
961 | err = -EINVAL; | |
962 | } | |
963 | ||
964 | done: | |
965 | return err; | |
966 | } | |
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); | |
82612de1 | 973 | int max_mtu = IP_MAX_MTU - dev->hard_header_len - 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]) { |
82612de1 | 1150 | unsigned int max = IP_MAX_MTU - dev->hard_header_len - nt->hlen; |
24fc7979 | 1151 | |
5568cdc3 DM |
1152 | mtu = clamp(dev->mtu, (unsigned int)ETH_MIN_MTU, |
1153 | (unsigned int)(max - sizeof(struct iphdr))); | |
f6cc9c05 | 1154 | } |
c5441932 | 1155 | |
5568cdc3 DM |
1156 | err = dev_set_mtu(dev, mtu); |
1157 | if (err) | |
1158 | goto err_dev_set_mtu; | |
c5441932 PS |
1159 | |
1160 | ip_tunnel_add(itn, nt); | |
f6cc9c05 PM |
1161 | return 0; |
1162 | ||
1163 | err_dev_set_mtu: | |
1164 | unregister_netdevice(dev); | |
1165 | err_register_netdevice: | |
c5441932 PS |
1166 | return err; |
1167 | } | |
1168 | EXPORT_SYMBOL_GPL(ip_tunnel_newlink); | |
1169 | ||
1170 | int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[], | |
9830ad4c | 1171 | struct ip_tunnel_parm *p, __u32 fwmark) |
c5441932 | 1172 | { |
6c742e71 | 1173 | struct ip_tunnel *t; |
c5441932 | 1174 | struct ip_tunnel *tunnel = netdev_priv(dev); |
6c742e71 | 1175 | struct net *net = tunnel->net; |
c5441932 PS |
1176 | struct ip_tunnel_net *itn = net_generic(net, tunnel->ip_tnl_net_id); |
1177 | ||
1178 | if (dev == itn->fb_tunnel_dev) | |
1179 | return -EINVAL; | |
1180 | ||
c5441932 PS |
1181 | t = ip_tunnel_find(itn, p, dev->type); |
1182 | ||
1183 | if (t) { | |
1184 | if (t->dev != dev) | |
1185 | return -EEXIST; | |
1186 | } else { | |
6c742e71 | 1187 | t = tunnel; |
c5441932 PS |
1188 | |
1189 | if (dev->type != ARPHRD_ETHER) { | |
1190 | unsigned int nflags = 0; | |
1191 | ||
1192 | if (ipv4_is_multicast(p->iph.daddr)) | |
1193 | nflags = IFF_BROADCAST; | |
1194 | else if (p->iph.daddr) | |
1195 | nflags = IFF_POINTOPOINT; | |
1196 | ||
1197 | if ((dev->flags ^ nflags) & | |
1198 | (IFF_POINTOPOINT | IFF_BROADCAST)) | |
1199 | return -EINVAL; | |
1200 | } | |
1201 | } | |
1202 | ||
9830ad4c | 1203 | ip_tunnel_update(itn, t, dev, p, !tb[IFLA_MTU], fwmark); |
c5441932 PS |
1204 | return 0; |
1205 | } | |
1206 | EXPORT_SYMBOL_GPL(ip_tunnel_changelink); | |
1207 | ||
1208 | int ip_tunnel_init(struct net_device *dev) | |
1209 | { | |
1210 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1211 | struct iphdr *iph = &tunnel->parms.iph; | |
1c213bd2 | 1212 | int err; |
c5441932 | 1213 | |
cf124db5 DM |
1214 | dev->needs_free_netdev = true; |
1215 | dev->priv_destructor = ip_tunnel_dev_free; | |
1c213bd2 | 1216 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
c5441932 PS |
1217 | if (!dev->tstats) |
1218 | return -ENOMEM; | |
1219 | ||
e09acddf PA |
1220 | err = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); |
1221 | if (err) { | |
9a4aa9af | 1222 | free_percpu(dev->tstats); |
e09acddf | 1223 | return err; |
9a4aa9af TH |
1224 | } |
1225 | ||
c5441932 PS |
1226 | err = gro_cells_init(&tunnel->gro_cells, dev); |
1227 | if (err) { | |
e09acddf | 1228 | dst_cache_destroy(&tunnel->dst_cache); |
c5441932 PS |
1229 | free_percpu(dev->tstats); |
1230 | return err; | |
1231 | } | |
1232 | ||
1233 | tunnel->dev = dev; | |
6c742e71 | 1234 | tunnel->net = dev_net(dev); |
c5441932 PS |
1235 | strcpy(tunnel->parms.name, dev->name); |
1236 | iph->version = 4; | |
1237 | iph->ihl = 5; | |
1238 | ||
2e15ea39 PS |
1239 | if (tunnel->collect_md) { |
1240 | dev->features |= NETIF_F_NETNS_LOCAL; | |
1241 | netif_keep_dst(dev); | |
1242 | } | |
c5441932 PS |
1243 | return 0; |
1244 | } | |
1245 | EXPORT_SYMBOL_GPL(ip_tunnel_init); | |
1246 | ||
1247 | void ip_tunnel_uninit(struct net_device *dev) | |
1248 | { | |
c5441932 | 1249 | struct ip_tunnel *tunnel = netdev_priv(dev); |
6c742e71 | 1250 | struct net *net = tunnel->net; |
c5441932 PS |
1251 | struct ip_tunnel_net *itn; |
1252 | ||
1253 | itn = net_generic(net, tunnel->ip_tnl_net_id); | |
1254 | /* fb_tunnel_dev will be unregisted in net-exit call. */ | |
1255 | if (itn->fb_tunnel_dev != dev) | |
2e15ea39 | 1256 | ip_tunnel_del(itn, netdev_priv(dev)); |
7d442fab | 1257 | |
e09acddf | 1258 | dst_cache_reset(&tunnel->dst_cache); |
c5441932 PS |
1259 | } |
1260 | EXPORT_SYMBOL_GPL(ip_tunnel_uninit); | |
1261 | ||
1262 | /* Do least required initialization, rest of init is done in tunnel_init call */ | |
c7d03a00 | 1263 | void ip_tunnel_setup(struct net_device *dev, unsigned int net_id) |
c5441932 PS |
1264 | { |
1265 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1266 | tunnel->ip_tnl_net_id = net_id; | |
1267 | } | |
1268 | EXPORT_SYMBOL_GPL(ip_tunnel_setup); | |
1269 | ||
1270 | MODULE_LICENSE("GPL"); |