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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, | |
9830ad4c CG |
296 | __be32 key, __u8 tos, int oif, |
297 | __u32 mark) | |
c5441932 PS |
298 | { |
299 | memset(fl4, 0, sizeof(*fl4)); | |
300 | fl4->flowi4_oif = oif; | |
301 | fl4->daddr = daddr; | |
302 | fl4->saddr = saddr; | |
303 | fl4->flowi4_tos = tos; | |
304 | fl4->flowi4_proto = proto; | |
305 | fl4->fl4_gre_key = key; | |
9830ad4c | 306 | fl4->flowi4_mark = mark; |
c5441932 PS |
307 | } |
308 | ||
309 | static int ip_tunnel_bind_dev(struct net_device *dev) | |
310 | { | |
311 | struct net_device *tdev = NULL; | |
312 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
313 | const struct iphdr *iph; | |
314 | int hlen = LL_MAX_HEADER; | |
315 | int mtu = ETH_DATA_LEN; | |
316 | int t_hlen = tunnel->hlen + sizeof(struct iphdr); | |
317 | ||
318 | iph = &tunnel->parms.iph; | |
319 | ||
320 | /* Guess output device to choose reasonable mtu and needed_headroom */ | |
321 | if (iph->daddr) { | |
322 | struct flowi4 fl4; | |
323 | struct rtable *rt; | |
324 | ||
7d442fab TH |
325 | init_tunnel_flow(&fl4, iph->protocol, iph->daddr, |
326 | iph->saddr, tunnel->parms.o_key, | |
9830ad4c CG |
327 | RT_TOS(iph->tos), tunnel->parms.link, |
328 | tunnel->fwmark); | |
7d442fab TH |
329 | rt = ip_route_output_key(tunnel->net, &fl4); |
330 | ||
c5441932 PS |
331 | if (!IS_ERR(rt)) { |
332 | tdev = rt->dst.dev; | |
333 | ip_rt_put(rt); | |
334 | } | |
335 | if (dev->type != ARPHRD_ETHER) | |
336 | dev->flags |= IFF_POINTOPOINT; | |
f27337e1 PA |
337 | |
338 | dst_cache_reset(&tunnel->dst_cache); | |
c5441932 PS |
339 | } |
340 | ||
341 | if (!tdev && tunnel->parms.link) | |
6c742e71 | 342 | tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link); |
c5441932 PS |
343 | |
344 | if (tdev) { | |
345 | hlen = tdev->hard_header_len + tdev->needed_headroom; | |
346 | mtu = tdev->mtu; | |
347 | } | |
c5441932 PS |
348 | |
349 | dev->needed_headroom = t_hlen + hlen; | |
350 | mtu -= (dev->hard_header_len + t_hlen); | |
351 | ||
352 | if (mtu < 68) | |
353 | mtu = 68; | |
354 | ||
355 | return mtu; | |
356 | } | |
357 | ||
358 | static struct ip_tunnel *ip_tunnel_create(struct net *net, | |
359 | struct ip_tunnel_net *itn, | |
360 | struct ip_tunnel_parm *parms) | |
361 | { | |
4929fd8c | 362 | struct ip_tunnel *nt; |
c5441932 | 363 | struct net_device *dev; |
b96f9afe | 364 | int t_hlen; |
c5441932 PS |
365 | |
366 | BUG_ON(!itn->fb_tunnel_dev); | |
c5441932 PS |
367 | dev = __ip_tunnel_create(net, itn->fb_tunnel_dev->rtnl_link_ops, parms); |
368 | if (IS_ERR(dev)) | |
6dd3c9ec | 369 | return ERR_CAST(dev); |
c5441932 PS |
370 | |
371 | dev->mtu = ip_tunnel_bind_dev(dev); | |
372 | ||
373 | nt = netdev_priv(dev); | |
b96f9afe JW |
374 | t_hlen = nt->hlen + sizeof(struct iphdr); |
375 | dev->min_mtu = ETH_MIN_MTU; | |
376 | dev->max_mtu = 0xFFF8 - dev->hard_header_len - t_hlen; | |
c5441932 PS |
377 | ip_tunnel_add(itn, nt); |
378 | return nt; | |
379 | } | |
380 | ||
381 | int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb, | |
2e15ea39 PS |
382 | const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst, |
383 | bool log_ecn_error) | |
c5441932 | 384 | { |
8f84985f | 385 | struct pcpu_sw_netstats *tstats; |
c5441932 PS |
386 | const struct iphdr *iph = ip_hdr(skb); |
387 | int err; | |
388 | ||
c5441932 PS |
389 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
390 | if (ipv4_is_multicast(iph->daddr)) { | |
c5441932 PS |
391 | tunnel->dev->stats.multicast++; |
392 | skb->pkt_type = PACKET_BROADCAST; | |
393 | } | |
394 | #endif | |
395 | ||
396 | if ((!(tpi->flags&TUNNEL_CSUM) && (tunnel->parms.i_flags&TUNNEL_CSUM)) || | |
397 | ((tpi->flags&TUNNEL_CSUM) && !(tunnel->parms.i_flags&TUNNEL_CSUM))) { | |
398 | tunnel->dev->stats.rx_crc_errors++; | |
399 | tunnel->dev->stats.rx_errors++; | |
400 | goto drop; | |
401 | } | |
402 | ||
403 | if (tunnel->parms.i_flags&TUNNEL_SEQ) { | |
404 | if (!(tpi->flags&TUNNEL_SEQ) || | |
405 | (tunnel->i_seqno && (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) { | |
406 | tunnel->dev->stats.rx_fifo_errors++; | |
407 | tunnel->dev->stats.rx_errors++; | |
408 | goto drop; | |
409 | } | |
410 | tunnel->i_seqno = ntohl(tpi->seq) + 1; | |
411 | } | |
412 | ||
e96f2e7c YC |
413 | skb_reset_network_header(skb); |
414 | ||
c5441932 PS |
415 | err = IP_ECN_decapsulate(iph, skb); |
416 | if (unlikely(err)) { | |
417 | if (log_ecn_error) | |
418 | net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", | |
419 | &iph->saddr, iph->tos); | |
420 | if (err > 1) { | |
421 | ++tunnel->dev->stats.rx_frame_errors; | |
422 | ++tunnel->dev->stats.rx_errors; | |
423 | goto drop; | |
424 | } | |
425 | } | |
426 | ||
427 | tstats = this_cpu_ptr(tunnel->dev->tstats); | |
428 | u64_stats_update_begin(&tstats->syncp); | |
429 | tstats->rx_packets++; | |
430 | tstats->rx_bytes += skb->len; | |
431 | u64_stats_update_end(&tstats->syncp); | |
432 | ||
81b9eab5 AS |
433 | skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev))); |
434 | ||
3d7b46cd PS |
435 | if (tunnel->dev->type == ARPHRD_ETHER) { |
436 | skb->protocol = eth_type_trans(skb, tunnel->dev); | |
437 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); | |
438 | } else { | |
439 | skb->dev = tunnel->dev; | |
440 | } | |
64261f23 | 441 | |
2e15ea39 PS |
442 | if (tun_dst) |
443 | skb_dst_set(skb, (struct dst_entry *)tun_dst); | |
444 | ||
c5441932 PS |
445 | gro_cells_receive(&tunnel->gro_cells, skb); |
446 | return 0; | |
447 | ||
448 | drop: | |
469f87e1 HY |
449 | if (tun_dst) |
450 | dst_release((struct dst_entry *)tun_dst); | |
c5441932 PS |
451 | kfree_skb(skb); |
452 | return 0; | |
453 | } | |
454 | EXPORT_SYMBOL_GPL(ip_tunnel_rcv); | |
455 | ||
a8c5f90f TH |
456 | int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *ops, |
457 | unsigned int num) | |
458 | { | |
bb1553c8 TG |
459 | if (num >= MAX_IPTUN_ENCAP_OPS) |
460 | return -ERANGE; | |
461 | ||
a8c5f90f TH |
462 | return !cmpxchg((const struct ip_tunnel_encap_ops **) |
463 | &iptun_encaps[num], | |
464 | NULL, ops) ? 0 : -1; | |
56328486 | 465 | } |
a8c5f90f TH |
466 | EXPORT_SYMBOL(ip_tunnel_encap_add_ops); |
467 | ||
468 | int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *ops, | |
469 | unsigned int num) | |
470 | { | |
471 | int ret; | |
472 | ||
bb1553c8 TG |
473 | if (num >= MAX_IPTUN_ENCAP_OPS) |
474 | return -ERANGE; | |
475 | ||
a8c5f90f TH |
476 | ret = (cmpxchg((const struct ip_tunnel_encap_ops **) |
477 | &iptun_encaps[num], | |
478 | ops, NULL) == ops) ? 0 : -1; | |
479 | ||
480 | synchronize_net(); | |
481 | ||
482 | return ret; | |
483 | } | |
484 | EXPORT_SYMBOL(ip_tunnel_encap_del_ops); | |
56328486 TH |
485 | |
486 | int ip_tunnel_encap_setup(struct ip_tunnel *t, | |
487 | struct ip_tunnel_encap *ipencap) | |
488 | { | |
489 | int hlen; | |
490 | ||
491 | memset(&t->encap, 0, sizeof(t->encap)); | |
492 | ||
493 | hlen = ip_encap_hlen(ipencap); | |
494 | if (hlen < 0) | |
495 | return hlen; | |
496 | ||
497 | t->encap.type = ipencap->type; | |
498 | t->encap.sport = ipencap->sport; | |
499 | t->encap.dport = ipencap->dport; | |
500 | t->encap.flags = ipencap->flags; | |
501 | ||
502 | t->encap_hlen = hlen; | |
503 | t->hlen = t->encap_hlen + t->tun_hlen; | |
504 | ||
505 | return 0; | |
506 | } | |
507 | EXPORT_SYMBOL_GPL(ip_tunnel_encap_setup); | |
508 | ||
23a3647b | 509 | static int tnl_update_pmtu(struct net_device *dev, struct sk_buff *skb, |
fc24f2b2 TT |
510 | struct rtable *rt, __be16 df, |
511 | const struct iphdr *inner_iph) | |
23a3647b PS |
512 | { |
513 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
8c91e162 | 514 | int pkt_size = skb->len - tunnel->hlen - dev->hard_header_len; |
23a3647b PS |
515 | int mtu; |
516 | ||
517 | if (df) | |
518 | mtu = dst_mtu(&rt->dst) - dev->hard_header_len | |
519 | - sizeof(struct iphdr) - tunnel->hlen; | |
520 | else | |
521 | mtu = skb_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu; | |
522 | ||
523 | if (skb_dst(skb)) | |
524 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); | |
525 | ||
526 | if (skb->protocol == htons(ETH_P_IP)) { | |
527 | if (!skb_is_gso(skb) && | |
fc24f2b2 TT |
528 | (inner_iph->frag_off & htons(IP_DF)) && |
529 | mtu < pkt_size) { | |
23a3647b PS |
530 | memset(IPCB(skb), 0, sizeof(*IPCB(skb))); |
531 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); | |
532 | return -E2BIG; | |
533 | } | |
534 | } | |
535 | #if IS_ENABLED(CONFIG_IPV6) | |
536 | else if (skb->protocol == htons(ETH_P_IPV6)) { | |
537 | struct rt6_info *rt6 = (struct rt6_info *)skb_dst(skb); | |
538 | ||
539 | if (rt6 && mtu < dst_mtu(skb_dst(skb)) && | |
540 | mtu >= IPV6_MIN_MTU) { | |
541 | if ((tunnel->parms.iph.daddr && | |
542 | !ipv4_is_multicast(tunnel->parms.iph.daddr)) || | |
543 | rt6->rt6i_dst.plen == 128) { | |
544 | rt6->rt6i_flags |= RTF_MODIFIED; | |
545 | dst_metric_set(skb_dst(skb), RTAX_MTU, mtu); | |
546 | } | |
547 | } | |
548 | ||
549 | if (!skb_is_gso(skb) && mtu >= IPV6_MIN_MTU && | |
550 | mtu < pkt_size) { | |
551 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); | |
552 | return -E2BIG; | |
553 | } | |
554 | } | |
555 | #endif | |
556 | return 0; | |
557 | } | |
558 | ||
cfc7381b AS |
559 | void ip_md_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, u8 proto) |
560 | { | |
561 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
562 | u32 headroom = sizeof(struct iphdr); | |
563 | struct ip_tunnel_info *tun_info; | |
564 | const struct ip_tunnel_key *key; | |
565 | const struct iphdr *inner_iph; | |
566 | struct rtable *rt; | |
567 | struct flowi4 fl4; | |
568 | __be16 df = 0; | |
569 | u8 tos, ttl; | |
570 | ||
571 | tun_info = skb_tunnel_info(skb); | |
572 | if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) || | |
573 | ip_tunnel_info_af(tun_info) != AF_INET)) | |
574 | goto tx_error; | |
575 | key = &tun_info->key; | |
576 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); | |
577 | inner_iph = (const struct iphdr *)skb_inner_network_header(skb); | |
578 | tos = key->tos; | |
579 | if (tos == 1) { | |
580 | if (skb->protocol == htons(ETH_P_IP)) | |
581 | tos = inner_iph->tos; | |
582 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
583 | tos = ipv6_get_dsfield((const struct ipv6hdr *)inner_iph); | |
584 | } | |
585 | init_tunnel_flow(&fl4, proto, key->u.ipv4.dst, key->u.ipv4.src, 0, | |
9830ad4c | 586 | RT_TOS(tos), tunnel->parms.link, tunnel->fwmark); |
cfc7381b AS |
587 | if (tunnel->encap.type != TUNNEL_ENCAP_NONE) |
588 | goto tx_error; | |
589 | rt = ip_route_output_key(tunnel->net, &fl4); | |
590 | if (IS_ERR(rt)) { | |
591 | dev->stats.tx_carrier_errors++; | |
592 | goto tx_error; | |
593 | } | |
594 | if (rt->dst.dev == dev) { | |
595 | ip_rt_put(rt); | |
596 | dev->stats.collisions++; | |
597 | goto tx_error; | |
598 | } | |
599 | tos = ip_tunnel_ecn_encap(tos, inner_iph, skb); | |
600 | ttl = key->ttl; | |
601 | if (ttl == 0) { | |
602 | if (skb->protocol == htons(ETH_P_IP)) | |
603 | ttl = inner_iph->ttl; | |
604 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
605 | ttl = ((const struct ipv6hdr *)inner_iph)->hop_limit; | |
606 | else | |
607 | ttl = ip4_dst_hoplimit(&rt->dst); | |
608 | } | |
609 | if (key->tun_flags & TUNNEL_DONT_FRAGMENT) | |
610 | df = htons(IP_DF); | |
611 | else if (skb->protocol == htons(ETH_P_IP)) | |
612 | df = inner_iph->frag_off & htons(IP_DF); | |
613 | headroom += LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len; | |
614 | if (headroom > dev->needed_headroom) | |
615 | dev->needed_headroom = headroom; | |
616 | ||
617 | if (skb_cow_head(skb, dev->needed_headroom)) { | |
618 | ip_rt_put(rt); | |
619 | goto tx_dropped; | |
620 | } | |
599a47da HY |
621 | iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, proto, tos, ttl, |
622 | df, !net_eq(tunnel->net, dev_net(dev))); | |
cfc7381b AS |
623 | return; |
624 | tx_error: | |
625 | dev->stats.tx_errors++; | |
626 | goto kfree; | |
627 | tx_dropped: | |
628 | dev->stats.tx_dropped++; | |
629 | kfree: | |
630 | kfree_skb(skb); | |
631 | } | |
632 | EXPORT_SYMBOL_GPL(ip_md_tunnel_xmit); | |
633 | ||
c5441932 | 634 | void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, |
56328486 | 635 | const struct iphdr *tnl_params, u8 protocol) |
c5441932 PS |
636 | { |
637 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
638 | const struct iphdr *inner_iph; | |
c5441932 PS |
639 | struct flowi4 fl4; |
640 | u8 tos, ttl; | |
641 | __be16 df; | |
b045d37b | 642 | struct rtable *rt; /* Route to the other host */ |
c5441932 PS |
643 | unsigned int max_headroom; /* The extra header space needed */ |
644 | __be32 dst; | |
22fb22ea | 645 | bool connected; |
c5441932 PS |
646 | |
647 | inner_iph = (const struct iphdr *)skb_inner_network_header(skb); | |
22fb22ea | 648 | connected = (tunnel->parms.iph.daddr != 0); |
c5441932 | 649 | |
5146d1f1 BH |
650 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
651 | ||
c5441932 PS |
652 | dst = tnl_params->daddr; |
653 | if (dst == 0) { | |
654 | /* NBMA tunnel */ | |
655 | ||
51456b29 | 656 | if (!skb_dst(skb)) { |
c5441932 PS |
657 | dev->stats.tx_fifo_errors++; |
658 | goto tx_error; | |
659 | } | |
660 | ||
661 | if (skb->protocol == htons(ETH_P_IP)) { | |
662 | rt = skb_rtable(skb); | |
663 | dst = rt_nexthop(rt, inner_iph->daddr); | |
664 | } | |
665 | #if IS_ENABLED(CONFIG_IPV6) | |
666 | else if (skb->protocol == htons(ETH_P_IPV6)) { | |
667 | const struct in6_addr *addr6; | |
668 | struct neighbour *neigh; | |
669 | bool do_tx_error_icmp; | |
670 | int addr_type; | |
671 | ||
672 | neigh = dst_neigh_lookup(skb_dst(skb), | |
673 | &ipv6_hdr(skb)->daddr); | |
51456b29 | 674 | if (!neigh) |
c5441932 PS |
675 | goto tx_error; |
676 | ||
677 | addr6 = (const struct in6_addr *)&neigh->primary_key; | |
678 | addr_type = ipv6_addr_type(addr6); | |
679 | ||
680 | if (addr_type == IPV6_ADDR_ANY) { | |
681 | addr6 = &ipv6_hdr(skb)->daddr; | |
682 | addr_type = ipv6_addr_type(addr6); | |
683 | } | |
684 | ||
685 | if ((addr_type & IPV6_ADDR_COMPATv4) == 0) | |
686 | do_tx_error_icmp = true; | |
687 | else { | |
688 | do_tx_error_icmp = false; | |
689 | dst = addr6->s6_addr32[3]; | |
690 | } | |
691 | neigh_release(neigh); | |
692 | if (do_tx_error_icmp) | |
693 | goto tx_error_icmp; | |
694 | } | |
695 | #endif | |
696 | else | |
697 | goto tx_error; | |
7d442fab TH |
698 | |
699 | connected = false; | |
c5441932 PS |
700 | } |
701 | ||
702 | tos = tnl_params->tos; | |
703 | if (tos & 0x1) { | |
704 | tos &= ~0x1; | |
7d442fab | 705 | if (skb->protocol == htons(ETH_P_IP)) { |
c5441932 | 706 | tos = inner_iph->tos; |
7d442fab TH |
707 | connected = false; |
708 | } else if (skb->protocol == htons(ETH_P_IPV6)) { | |
c5441932 | 709 | tos = ipv6_get_dsfield((const struct ipv6hdr *)inner_iph); |
7d442fab TH |
710 | connected = false; |
711 | } | |
c5441932 PS |
712 | } |
713 | ||
7d442fab | 714 | init_tunnel_flow(&fl4, protocol, dst, tnl_params->saddr, |
9830ad4c CG |
715 | tunnel->parms.o_key, RT_TOS(tos), tunnel->parms.link, |
716 | tunnel->fwmark); | |
7d442fab | 717 | |
56328486 TH |
718 | if (ip_tunnel_encap(skb, tunnel, &protocol, &fl4) < 0) |
719 | goto tx_error; | |
720 | ||
e09acddf PA |
721 | rt = connected ? dst_cache_get_ip4(&tunnel->dst_cache, &fl4.saddr) : |
722 | NULL; | |
7d442fab TH |
723 | |
724 | if (!rt) { | |
725 | rt = ip_route_output_key(tunnel->net, &fl4); | |
726 | ||
727 | if (IS_ERR(rt)) { | |
728 | dev->stats.tx_carrier_errors++; | |
729 | goto tx_error; | |
730 | } | |
731 | if (connected) | |
e09acddf PA |
732 | dst_cache_set_ip4(&tunnel->dst_cache, &rt->dst, |
733 | fl4.saddr); | |
c5441932 | 734 | } |
7d442fab | 735 | |
0e6fbc5b | 736 | if (rt->dst.dev == dev) { |
c5441932 PS |
737 | ip_rt_put(rt); |
738 | dev->stats.collisions++; | |
739 | goto tx_error; | |
740 | } | |
c5441932 | 741 | |
fc24f2b2 | 742 | if (tnl_update_pmtu(dev, skb, rt, tnl_params->frag_off, inner_iph)) { |
23a3647b PS |
743 | ip_rt_put(rt); |
744 | goto tx_error; | |
c5441932 | 745 | } |
c5441932 PS |
746 | |
747 | if (tunnel->err_count > 0) { | |
748 | if (time_before(jiffies, | |
749 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
750 | tunnel->err_count--; | |
751 | ||
752 | dst_link_failure(skb); | |
753 | } else | |
754 | tunnel->err_count = 0; | |
755 | } | |
756 | ||
d4a71b15 | 757 | tos = ip_tunnel_ecn_encap(tos, inner_iph, skb); |
c5441932 PS |
758 | ttl = tnl_params->ttl; |
759 | if (ttl == 0) { | |
760 | if (skb->protocol == htons(ETH_P_IP)) | |
761 | ttl = inner_iph->ttl; | |
762 | #if IS_ENABLED(CONFIG_IPV6) | |
763 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
764 | ttl = ((const struct ipv6hdr *)inner_iph)->hop_limit; | |
765 | #endif | |
766 | else | |
767 | ttl = ip4_dst_hoplimit(&rt->dst); | |
768 | } | |
769 | ||
23a3647b | 770 | df = tnl_params->frag_off; |
22a59be8 | 771 | if (skb->protocol == htons(ETH_P_IP) && !tunnel->ignore_df) |
23a3647b PS |
772 | df |= (inner_iph->frag_off&htons(IP_DF)); |
773 | ||
0e6fbc5b | 774 | max_headroom = LL_RESERVED_SPACE(rt->dst.dev) + sizeof(struct iphdr) |
7371e022 | 775 | + rt->dst.header_len + ip_encap_hlen(&tunnel->encap); |
3e08f4a7 | 776 | if (max_headroom > dev->needed_headroom) |
c5441932 | 777 | dev->needed_headroom = max_headroom; |
3e08f4a7 SK |
778 | |
779 | if (skb_cow_head(skb, dev->needed_headroom)) { | |
586d5fc8 | 780 | ip_rt_put(rt); |
3e08f4a7 | 781 | dev->stats.tx_dropped++; |
3acfa1e7 | 782 | kfree_skb(skb); |
3e08f4a7 | 783 | return; |
c5441932 PS |
784 | } |
785 | ||
039f5062 PS |
786 | iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, protocol, tos, ttl, |
787 | df, !net_eq(tunnel->net, dev_net(dev))); | |
c5441932 PS |
788 | return; |
789 | ||
790 | #if IS_ENABLED(CONFIG_IPV6) | |
791 | tx_error_icmp: | |
792 | dst_link_failure(skb); | |
793 | #endif | |
794 | tx_error: | |
795 | dev->stats.tx_errors++; | |
3acfa1e7 | 796 | kfree_skb(skb); |
c5441932 PS |
797 | } |
798 | EXPORT_SYMBOL_GPL(ip_tunnel_xmit); | |
799 | ||
800 | static void ip_tunnel_update(struct ip_tunnel_net *itn, | |
801 | struct ip_tunnel *t, | |
802 | struct net_device *dev, | |
803 | struct ip_tunnel_parm *p, | |
9830ad4c CG |
804 | bool set_mtu, |
805 | __u32 fwmark) | |
c5441932 | 806 | { |
2e15ea39 | 807 | ip_tunnel_del(itn, t); |
c5441932 PS |
808 | t->parms.iph.saddr = p->iph.saddr; |
809 | t->parms.iph.daddr = p->iph.daddr; | |
810 | t->parms.i_key = p->i_key; | |
811 | t->parms.o_key = p->o_key; | |
812 | if (dev->type != ARPHRD_ETHER) { | |
813 | memcpy(dev->dev_addr, &p->iph.saddr, 4); | |
814 | memcpy(dev->broadcast, &p->iph.daddr, 4); | |
815 | } | |
816 | ip_tunnel_add(itn, t); | |
817 | ||
818 | t->parms.iph.ttl = p->iph.ttl; | |
819 | t->parms.iph.tos = p->iph.tos; | |
820 | t->parms.iph.frag_off = p->iph.frag_off; | |
821 | ||
9830ad4c | 822 | if (t->parms.link != p->link || t->fwmark != fwmark) { |
c5441932 PS |
823 | int mtu; |
824 | ||
825 | t->parms.link = p->link; | |
9830ad4c | 826 | t->fwmark = fwmark; |
c5441932 PS |
827 | mtu = ip_tunnel_bind_dev(dev); |
828 | if (set_mtu) | |
829 | dev->mtu = mtu; | |
830 | } | |
e09acddf | 831 | dst_cache_reset(&t->dst_cache); |
c5441932 PS |
832 | netdev_state_change(dev); |
833 | } | |
834 | ||
835 | int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd) | |
836 | { | |
837 | int err = 0; | |
8c923ce2 ND |
838 | struct ip_tunnel *t = netdev_priv(dev); |
839 | struct net *net = t->net; | |
840 | struct ip_tunnel_net *itn = net_generic(net, t->ip_tnl_net_id); | |
c5441932 PS |
841 | |
842 | BUG_ON(!itn->fb_tunnel_dev); | |
843 | switch (cmd) { | |
844 | case SIOCGETTUNNEL: | |
8c923ce2 | 845 | if (dev == itn->fb_tunnel_dev) { |
c5441932 | 846 | t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type); |
51456b29 | 847 | if (!t) |
8c923ce2 ND |
848 | t = netdev_priv(dev); |
849 | } | |
c5441932 PS |
850 | memcpy(p, &t->parms, sizeof(*p)); |
851 | break; | |
852 | ||
853 | case SIOCADDTUNNEL: | |
854 | case SIOCCHGTUNNEL: | |
855 | err = -EPERM; | |
856 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
857 | goto done; | |
858 | if (p->iph.ttl) | |
859 | p->iph.frag_off |= htons(IP_DF); | |
7c8e6b9c DP |
860 | if (!(p->i_flags & VTI_ISVTI)) { |
861 | if (!(p->i_flags & TUNNEL_KEY)) | |
862 | p->i_key = 0; | |
863 | if (!(p->o_flags & TUNNEL_KEY)) | |
864 | p->o_key = 0; | |
865 | } | |
c5441932 PS |
866 | |
867 | t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type); | |
868 | ||
d61746b2 SK |
869 | if (cmd == SIOCADDTUNNEL) { |
870 | if (!t) { | |
871 | t = ip_tunnel_create(net, itn, p); | |
872 | err = PTR_ERR_OR_ZERO(t); | |
873 | break; | |
874 | } | |
875 | ||
876 | err = -EEXIST; | |
ee30ef4d | 877 | break; |
6dd3c9ec | 878 | } |
c5441932 | 879 | if (dev != itn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
00db4124 | 880 | if (t) { |
c5441932 PS |
881 | if (t->dev != dev) { |
882 | err = -EEXIST; | |
883 | break; | |
884 | } | |
885 | } else { | |
886 | unsigned int nflags = 0; | |
887 | ||
888 | if (ipv4_is_multicast(p->iph.daddr)) | |
889 | nflags = IFF_BROADCAST; | |
890 | else if (p->iph.daddr) | |
891 | nflags = IFF_POINTOPOINT; | |
892 | ||
893 | if ((dev->flags^nflags)&(IFF_POINTOPOINT|IFF_BROADCAST)) { | |
894 | err = -EINVAL; | |
895 | break; | |
896 | } | |
897 | ||
898 | t = netdev_priv(dev); | |
899 | } | |
900 | } | |
901 | ||
902 | if (t) { | |
903 | err = 0; | |
9830ad4c | 904 | ip_tunnel_update(itn, t, dev, p, true, 0); |
6dd3c9ec FW |
905 | } else { |
906 | err = -ENOENT; | |
907 | } | |
c5441932 PS |
908 | break; |
909 | ||
910 | case SIOCDELTUNNEL: | |
911 | err = -EPERM; | |
912 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
913 | goto done; | |
914 | ||
915 | if (dev == itn->fb_tunnel_dev) { | |
916 | err = -ENOENT; | |
917 | t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type); | |
51456b29 | 918 | if (!t) |
c5441932 PS |
919 | goto done; |
920 | err = -EPERM; | |
921 | if (t == netdev_priv(itn->fb_tunnel_dev)) | |
922 | goto done; | |
923 | dev = t->dev; | |
924 | } | |
925 | unregister_netdevice(dev); | |
926 | err = 0; | |
927 | break; | |
928 | ||
929 | default: | |
930 | err = -EINVAL; | |
931 | } | |
932 | ||
933 | done: | |
934 | return err; | |
935 | } | |
936 | EXPORT_SYMBOL_GPL(ip_tunnel_ioctl); | |
937 | ||
7e059158 | 938 | int __ip_tunnel_change_mtu(struct net_device *dev, int new_mtu, bool strict) |
c5441932 PS |
939 | { |
940 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
941 | int t_hlen = tunnel->hlen + sizeof(struct iphdr); | |
7e059158 | 942 | int max_mtu = 0xFFF8 - dev->hard_header_len - t_hlen; |
c5441932 | 943 | |
b96f9afe | 944 | if (new_mtu < ETH_MIN_MTU) |
c5441932 | 945 | return -EINVAL; |
7e059158 DW |
946 | |
947 | if (new_mtu > max_mtu) { | |
948 | if (strict) | |
949 | return -EINVAL; | |
950 | ||
951 | new_mtu = max_mtu; | |
952 | } | |
953 | ||
c5441932 PS |
954 | dev->mtu = new_mtu; |
955 | return 0; | |
956 | } | |
7e059158 DW |
957 | EXPORT_SYMBOL_GPL(__ip_tunnel_change_mtu); |
958 | ||
959 | int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu) | |
960 | { | |
961 | return __ip_tunnel_change_mtu(dev, new_mtu, true); | |
962 | } | |
c5441932 PS |
963 | EXPORT_SYMBOL_GPL(ip_tunnel_change_mtu); |
964 | ||
965 | static void ip_tunnel_dev_free(struct net_device *dev) | |
966 | { | |
967 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
968 | ||
969 | gro_cells_destroy(&tunnel->gro_cells); | |
e09acddf | 970 | dst_cache_destroy(&tunnel->dst_cache); |
c5441932 | 971 | free_percpu(dev->tstats); |
c5441932 PS |
972 | } |
973 | ||
974 | void ip_tunnel_dellink(struct net_device *dev, struct list_head *head) | |
975 | { | |
c5441932 PS |
976 | struct ip_tunnel *tunnel = netdev_priv(dev); |
977 | struct ip_tunnel_net *itn; | |
978 | ||
6c742e71 | 979 | itn = net_generic(tunnel->net, tunnel->ip_tnl_net_id); |
c5441932 PS |
980 | |
981 | if (itn->fb_tunnel_dev != dev) { | |
2e15ea39 | 982 | ip_tunnel_del(itn, netdev_priv(dev)); |
c5441932 PS |
983 | unregister_netdevice_queue(dev, head); |
984 | } | |
985 | } | |
986 | EXPORT_SYMBOL_GPL(ip_tunnel_dellink); | |
987 | ||
1728d4fa ND |
988 | struct net *ip_tunnel_get_link_net(const struct net_device *dev) |
989 | { | |
990 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
991 | ||
992 | return tunnel->net; | |
993 | } | |
994 | EXPORT_SYMBOL(ip_tunnel_get_link_net); | |
995 | ||
1e99584b ND |
996 | int ip_tunnel_get_iflink(const struct net_device *dev) |
997 | { | |
998 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
999 | ||
1000 | return tunnel->parms.link; | |
1001 | } | |
1002 | EXPORT_SYMBOL(ip_tunnel_get_iflink); | |
1003 | ||
c7d03a00 | 1004 | int ip_tunnel_init_net(struct net *net, unsigned int ip_tnl_net_id, |
c5441932 PS |
1005 | struct rtnl_link_ops *ops, char *devname) |
1006 | { | |
1007 | struct ip_tunnel_net *itn = net_generic(net, ip_tnl_net_id); | |
1008 | struct ip_tunnel_parm parms; | |
6261d983 | 1009 | unsigned int i; |
c5441932 | 1010 | |
6261d983 | 1011 | for (i = 0; i < IP_TNL_HASH_SIZE; i++) |
1012 | INIT_HLIST_HEAD(&itn->tunnels[i]); | |
c5441932 PS |
1013 | |
1014 | if (!ops) { | |
1015 | itn->fb_tunnel_dev = NULL; | |
1016 | return 0; | |
1017 | } | |
6261d983 | 1018 | |
c5441932 PS |
1019 | memset(&parms, 0, sizeof(parms)); |
1020 | if (devname) | |
1021 | strlcpy(parms.name, devname, IFNAMSIZ); | |
1022 | ||
1023 | rtnl_lock(); | |
1024 | itn->fb_tunnel_dev = __ip_tunnel_create(net, ops, &parms); | |
ea857f28 DC |
1025 | /* FB netdevice is special: we have one, and only one per netns. |
1026 | * Allowing to move it to another netns is clearly unsafe. | |
1027 | */ | |
67013282 | 1028 | if (!IS_ERR(itn->fb_tunnel_dev)) { |
b4de77ad | 1029 | itn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; |
78ff4be4 | 1030 | itn->fb_tunnel_dev->mtu = ip_tunnel_bind_dev(itn->fb_tunnel_dev); |
67013282 SK |
1031 | ip_tunnel_add(itn, netdev_priv(itn->fb_tunnel_dev)); |
1032 | } | |
b4de77ad | 1033 | rtnl_unlock(); |
c5441932 | 1034 | |
27d79f3b | 1035 | return PTR_ERR_OR_ZERO(itn->fb_tunnel_dev); |
c5441932 PS |
1036 | } |
1037 | EXPORT_SYMBOL_GPL(ip_tunnel_init_net); | |
1038 | ||
6c742e71 ND |
1039 | static void ip_tunnel_destroy(struct ip_tunnel_net *itn, struct list_head *head, |
1040 | struct rtnl_link_ops *ops) | |
c5441932 | 1041 | { |
6c742e71 ND |
1042 | struct net *net = dev_net(itn->fb_tunnel_dev); |
1043 | struct net_device *dev, *aux; | |
c5441932 PS |
1044 | int h; |
1045 | ||
6c742e71 ND |
1046 | for_each_netdev_safe(net, dev, aux) |
1047 | if (dev->rtnl_link_ops == ops) | |
1048 | unregister_netdevice_queue(dev, head); | |
1049 | ||
c5441932 PS |
1050 | for (h = 0; h < IP_TNL_HASH_SIZE; h++) { |
1051 | struct ip_tunnel *t; | |
1052 | struct hlist_node *n; | |
1053 | struct hlist_head *thead = &itn->tunnels[h]; | |
1054 | ||
1055 | hlist_for_each_entry_safe(t, n, thead, hash_node) | |
6c742e71 ND |
1056 | /* If dev is in the same netns, it has already |
1057 | * been added to the list by the previous loop. | |
1058 | */ | |
1059 | if (!net_eq(dev_net(t->dev), net)) | |
1060 | unregister_netdevice_queue(t->dev, head); | |
c5441932 | 1061 | } |
c5441932 PS |
1062 | } |
1063 | ||
6c742e71 | 1064 | void ip_tunnel_delete_net(struct ip_tunnel_net *itn, struct rtnl_link_ops *ops) |
c5441932 PS |
1065 | { |
1066 | LIST_HEAD(list); | |
1067 | ||
1068 | rtnl_lock(); | |
6c742e71 | 1069 | ip_tunnel_destroy(itn, &list, ops); |
c5441932 PS |
1070 | unregister_netdevice_many(&list); |
1071 | rtnl_unlock(); | |
c5441932 PS |
1072 | } |
1073 | EXPORT_SYMBOL_GPL(ip_tunnel_delete_net); | |
1074 | ||
1075 | int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[], | |
9830ad4c | 1076 | struct ip_tunnel_parm *p, __u32 fwmark) |
c5441932 PS |
1077 | { |
1078 | struct ip_tunnel *nt; | |
1079 | struct net *net = dev_net(dev); | |
1080 | struct ip_tunnel_net *itn; | |
1081 | int mtu; | |
1082 | int err; | |
1083 | ||
1084 | nt = netdev_priv(dev); | |
1085 | itn = net_generic(net, nt->ip_tnl_net_id); | |
1086 | ||
2e15ea39 PS |
1087 | if (nt->collect_md) { |
1088 | if (rtnl_dereference(itn->collect_md_tun)) | |
1089 | return -EEXIST; | |
1090 | } else { | |
1091 | if (ip_tunnel_find(itn, p, dev->type)) | |
1092 | return -EEXIST; | |
1093 | } | |
c5441932 | 1094 | |
5e6700b3 | 1095 | nt->net = net; |
c5441932 | 1096 | nt->parms = *p; |
9830ad4c | 1097 | nt->fwmark = fwmark; |
c5441932 PS |
1098 | err = register_netdevice(dev); |
1099 | if (err) | |
1100 | goto out; | |
1101 | ||
1102 | if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) | |
1103 | eth_hw_addr_random(dev); | |
1104 | ||
1105 | mtu = ip_tunnel_bind_dev(dev); | |
1106 | if (!tb[IFLA_MTU]) | |
1107 | dev->mtu = mtu; | |
1108 | ||
1109 | ip_tunnel_add(itn, nt); | |
c5441932 PS |
1110 | out: |
1111 | return err; | |
1112 | } | |
1113 | EXPORT_SYMBOL_GPL(ip_tunnel_newlink); | |
1114 | ||
1115 | int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[], | |
9830ad4c | 1116 | struct ip_tunnel_parm *p, __u32 fwmark) |
c5441932 | 1117 | { |
6c742e71 | 1118 | struct ip_tunnel *t; |
c5441932 | 1119 | struct ip_tunnel *tunnel = netdev_priv(dev); |
6c742e71 | 1120 | struct net *net = tunnel->net; |
c5441932 PS |
1121 | struct ip_tunnel_net *itn = net_generic(net, tunnel->ip_tnl_net_id); |
1122 | ||
1123 | if (dev == itn->fb_tunnel_dev) | |
11cd9476 | 1124 | return fan_has_map(&tunnel->fan) ? 0 : -EINVAL; |
c5441932 | 1125 | |
c5441932 PS |
1126 | t = ip_tunnel_find(itn, p, dev->type); |
1127 | ||
1128 | if (t) { | |
1129 | if (t->dev != dev) | |
1130 | return -EEXIST; | |
1131 | } else { | |
6c742e71 | 1132 | t = tunnel; |
c5441932 PS |
1133 | |
1134 | if (dev->type != ARPHRD_ETHER) { | |
1135 | unsigned int nflags = 0; | |
1136 | ||
1137 | if (ipv4_is_multicast(p->iph.daddr)) | |
1138 | nflags = IFF_BROADCAST; | |
1139 | else if (p->iph.daddr) | |
1140 | nflags = IFF_POINTOPOINT; | |
1141 | ||
1142 | if ((dev->flags ^ nflags) & | |
1143 | (IFF_POINTOPOINT | IFF_BROADCAST)) | |
1144 | return -EINVAL; | |
1145 | } | |
1146 | } | |
1147 | ||
9830ad4c | 1148 | ip_tunnel_update(itn, t, dev, p, !tb[IFLA_MTU], fwmark); |
c5441932 PS |
1149 | return 0; |
1150 | } | |
1151 | EXPORT_SYMBOL_GPL(ip_tunnel_changelink); | |
1152 | ||
1153 | int ip_tunnel_init(struct net_device *dev) | |
1154 | { | |
1155 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1156 | struct iphdr *iph = &tunnel->parms.iph; | |
1c213bd2 | 1157 | int err; |
c5441932 | 1158 | |
cf124db5 DM |
1159 | dev->needs_free_netdev = true; |
1160 | dev->priv_destructor = ip_tunnel_dev_free; | |
1c213bd2 | 1161 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
c5441932 PS |
1162 | if (!dev->tstats) |
1163 | return -ENOMEM; | |
1164 | ||
e09acddf PA |
1165 | err = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); |
1166 | if (err) { | |
9a4aa9af | 1167 | free_percpu(dev->tstats); |
e09acddf | 1168 | return err; |
9a4aa9af TH |
1169 | } |
1170 | ||
c5441932 PS |
1171 | err = gro_cells_init(&tunnel->gro_cells, dev); |
1172 | if (err) { | |
e09acddf | 1173 | dst_cache_destroy(&tunnel->dst_cache); |
c5441932 PS |
1174 | free_percpu(dev->tstats); |
1175 | return err; | |
1176 | } | |
1177 | ||
1178 | tunnel->dev = dev; | |
6c742e71 | 1179 | tunnel->net = dev_net(dev); |
c5441932 PS |
1180 | strcpy(tunnel->parms.name, dev->name); |
1181 | iph->version = 4; | |
1182 | iph->ihl = 5; | |
1183 | ||
2e15ea39 PS |
1184 | if (tunnel->collect_md) { |
1185 | dev->features |= NETIF_F_NETNS_LOCAL; | |
1186 | netif_keep_dst(dev); | |
1187 | } | |
c5441932 PS |
1188 | return 0; |
1189 | } | |
1190 | EXPORT_SYMBOL_GPL(ip_tunnel_init); | |
1191 | ||
1192 | void ip_tunnel_uninit(struct net_device *dev) | |
1193 | { | |
c5441932 | 1194 | struct ip_tunnel *tunnel = netdev_priv(dev); |
6c742e71 | 1195 | struct net *net = tunnel->net; |
c5441932 PS |
1196 | struct ip_tunnel_net *itn; |
1197 | ||
1198 | itn = net_generic(net, tunnel->ip_tnl_net_id); | |
1199 | /* fb_tunnel_dev will be unregisted in net-exit call. */ | |
1200 | if (itn->fb_tunnel_dev != dev) | |
2e15ea39 | 1201 | ip_tunnel_del(itn, netdev_priv(dev)); |
7d442fab | 1202 | |
e09acddf | 1203 | dst_cache_reset(&tunnel->dst_cache); |
c5441932 PS |
1204 | } |
1205 | EXPORT_SYMBOL_GPL(ip_tunnel_uninit); | |
1206 | ||
1207 | /* Do least required initialization, rest of init is done in tunnel_init call */ | |
c7d03a00 | 1208 | void ip_tunnel_setup(struct net_device *dev, unsigned int net_id) |
c5441932 PS |
1209 | { |
1210 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1211 | tunnel->ip_tnl_net_id = net_id; | |
1212 | } | |
1213 | EXPORT_SYMBOL_GPL(ip_tunnel_setup); | |
1214 | ||
1215 | MODULE_LICENSE("GPL"); |