1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Copyright (c) 2013 Nicira, Inc. |
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> |
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> |
29 | #include <linux/err.h> |
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> |
44 | #include <net/udp.h> |
45 | #include <net/dst_metadata.h> |
46 | |
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 | |
53 | static unsigned int ip_tunnel_hash(__be32 key, __be32 remote) |
54 | { |
55 | return hash_32(val: (__force u32)key ^ (__force u32)remote, |
56 | IP_TNL_HASH_BITS); |
57 | } |
58 | |
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 | struct ip_tunnel *t, *cand = NULL; |
89 | struct hlist_head *head; |
90 | struct net_device *ndev; |
91 | unsigned int hash; |
92 | |
93 | hash = ip_tunnel_hash(key, remote); |
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(p: &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 || |
113 | t->parms.iph.saddr != 0 || |
114 | !(t->dev->flags & IFF_UP)) |
115 | continue; |
116 | |
117 | if (!ip_tunnel_key_match(p: &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 | |
126 | hash = ip_tunnel_hash(key, remote: 0); |
127 | head = &itn->tunnels[hash]; |
128 | |
129 | hlist_for_each_entry_rcu(t, head, hash_node) { |
130 | if ((local != t->parms.iph.saddr || t->parms.iph.daddr != 0) && |
131 | (local != t->parms.iph.daddr || !ipv4_is_multicast(addr: local))) |
132 | continue; |
133 | |
134 | if (!(t->dev->flags & IFF_UP)) |
135 | continue; |
136 | |
137 | if (!ip_tunnel_key_match(p: &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 | |
146 | hlist_for_each_entry_rcu(t, head, hash_node) { |
147 | if ((!(flags & TUNNEL_NO_KEY) && t->parms.i_key != key) || |
148 | t->parms.iph.saddr != 0 || |
149 | t->parms.iph.daddr != 0 || |
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 | |
159 | if (cand) |
160 | return cand; |
161 | |
162 | t = rcu_dereference(itn->collect_md_tun); |
163 | if (t && t->dev->flags & IFF_UP) |
164 | return t; |
165 | |
166 | ndev = READ_ONCE(itn->fb_tunnel_dev); |
167 | if (ndev && ndev->flags & IFF_UP) |
168 | return netdev_priv(dev: ndev); |
169 | |
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; |
179 | __be32 i_key = parms->i_key; |
180 | |
181 | if (parms->iph.daddr && !ipv4_is_multicast(addr: parms->iph.daddr)) |
182 | remote = parms->iph.daddr; |
183 | else |
184 | remote = 0; |
185 | |
186 | if (!(parms->i_flags & TUNNEL_KEY) && (parms->i_flags & VTI_ISVTI)) |
187 | i_key = 0; |
188 | |
189 | h = ip_tunnel_hash(key: i_key, remote); |
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, parms: &t->parms); |
196 | |
197 | if (t->collect_md) |
198 | rcu_assign_pointer(itn->collect_md_tun, t); |
199 | hlist_add_head_rcu(n: &t->hash_node, h: head); |
200 | } |
201 | |
202 | static void ip_tunnel_del(struct ip_tunnel_net *itn, struct ip_tunnel *t) |
203 | { |
204 | if (t->collect_md) |
205 | rcu_assign_pointer(itn->collect_md_tun, NULL); |
206 | hlist_del_init_rcu(n: &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; |
216 | __be16 flags = parms->i_flags; |
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 && |
224 | link == t->parms.link && |
225 | type == t->dev->type && |
226 | ip_tunnel_key_match(p: &t->parms, flags, key)) |
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 | |
241 | err = -E2BIG; |
242 | if (parms->name[0]) { |
243 | if (!dev_valid_name(name: parms->name)) |
244 | goto failed; |
245 | strscpy(p: name, q: parms->name, IFNAMSIZ); |
246 | } else { |
247 | if (strlen(ops->kind) > (IFNAMSIZ - 3)) |
248 | goto failed; |
249 | strcpy(p: name, q: ops->kind); |
250 | strcat(p: name, q: "%d" ); |
251 | } |
252 | |
253 | ASSERT_RTNL(); |
254 | dev = alloc_netdev(ops->priv_size, name, NET_NAME_UNKNOWN, ops->setup); |
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; |
265 | tunnel->net = net; |
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(error: err); |
277 | } |
278 | |
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 | |
295 | ip_tunnel_init_flow(fl4: &fl4, proto: iph->protocol, daddr: iph->daddr, |
296 | saddr: iph->saddr, key: tunnel->parms.o_key, |
297 | RT_TOS(iph->tos), net: dev_net(dev), |
298 | oif: tunnel->parms.link, mark: tunnel->fwmark, tun_inner_hash: 0, flow_flags: 0); |
299 | rt = ip_route_output_key(net: tunnel->net, flp: &fl4); |
300 | |
301 | if (!IS_ERR(ptr: rt)) { |
302 | tdev = rt->dst.dev; |
303 | ip_rt_put(rt); |
304 | } |
305 | if (dev->type != ARPHRD_ETHER) |
306 | dev->flags |= IFF_POINTOPOINT; |
307 | |
308 | dst_cache_reset(dst_cache: &tunnel->dst_cache); |
309 | } |
310 | |
311 | if (!tdev && tunnel->parms.link) |
312 | tdev = __dev_get_by_index(net: tunnel->net, ifindex: tunnel->parms.link); |
313 | |
314 | if (tdev) { |
315 | hlen = tdev->hard_header_len + tdev->needed_headroom; |
316 | mtu = min(tdev->mtu, IP_MAX_MTU); |
317 | } |
318 | |
319 | dev->needed_headroom = t_hlen + hlen; |
320 | mtu -= t_hlen + (dev->type == ARPHRD_ETHER ? dev->hard_header_len : 0); |
321 | |
322 | if (mtu < IPV4_MIN_MTU) |
323 | mtu = IPV4_MIN_MTU; |
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 | { |
332 | struct ip_tunnel *nt; |
333 | struct net_device *dev; |
334 | int t_hlen; |
335 | int mtu; |
336 | int err; |
337 | |
338 | dev = __ip_tunnel_create(net, ops: itn->rtnl_link_ops, parms); |
339 | if (IS_ERR(ptr: dev)) |
340 | return ERR_CAST(ptr: dev); |
341 | |
342 | mtu = ip_tunnel_bind_dev(dev); |
343 | err = dev_set_mtu(dev, mtu); |
344 | if (err) |
345 | goto err_dev_set_mtu; |
346 | |
347 | nt = netdev_priv(dev); |
348 | t_hlen = nt->hlen + sizeof(struct iphdr); |
349 | dev->min_mtu = ETH_MIN_MTU; |
350 | dev->max_mtu = IP_MAX_MTU - t_hlen; |
351 | if (dev->type == ARPHRD_ETHER) |
352 | dev->max_mtu -= dev->hard_header_len; |
353 | |
354 | ip_tunnel_add(itn, t: nt); |
355 | return nt; |
356 | |
357 | err_dev_set_mtu: |
358 | unregister_netdevice(dev); |
359 | return ERR_PTR(error: err); |
360 | } |
361 | |
362 | void ip_tunnel_md_udp_encap(struct sk_buff *skb, struct ip_tunnel_info *info) |
363 | { |
364 | const struct iphdr *iph = ip_hdr(skb); |
365 | const struct udphdr *udph; |
366 | |
367 | if (iph->protocol != IPPROTO_UDP) |
368 | return; |
369 | |
370 | udph = (struct udphdr *)((__u8 *)iph + (iph->ihl << 2)); |
371 | info->encap.sport = udph->source; |
372 | info->encap.dport = udph->dest; |
373 | } |
374 | EXPORT_SYMBOL(ip_tunnel_md_udp_encap); |
375 | |
376 | int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb, |
377 | const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst, |
378 | bool log_ecn_error) |
379 | { |
380 | const struct iphdr *iph = ip_hdr(skb); |
381 | int err; |
382 | |
383 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
384 | if (ipv4_is_multicast(addr: iph->daddr)) { |
385 | DEV_STATS_INC(tunnel->dev, multicast); |
386 | skb->pkt_type = PACKET_BROADCAST; |
387 | } |
388 | #endif |
389 | |
390 | if ((!(tpi->flags&TUNNEL_CSUM) && (tunnel->parms.i_flags&TUNNEL_CSUM)) || |
391 | ((tpi->flags&TUNNEL_CSUM) && !(tunnel->parms.i_flags&TUNNEL_CSUM))) { |
392 | DEV_STATS_INC(tunnel->dev, rx_crc_errors); |
393 | DEV_STATS_INC(tunnel->dev, rx_errors); |
394 | goto drop; |
395 | } |
396 | |
397 | if (tunnel->parms.i_flags&TUNNEL_SEQ) { |
398 | if (!(tpi->flags&TUNNEL_SEQ) || |
399 | (tunnel->i_seqno && (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) { |
400 | DEV_STATS_INC(tunnel->dev, rx_fifo_errors); |
401 | DEV_STATS_INC(tunnel->dev, rx_errors); |
402 | goto drop; |
403 | } |
404 | tunnel->i_seqno = ntohl(tpi->seq) + 1; |
405 | } |
406 | |
407 | skb_set_network_header(skb, offset: (tunnel->dev->type == ARPHRD_ETHER) ? ETH_HLEN : 0); |
408 | |
409 | err = IP_ECN_decapsulate(oiph: iph, skb); |
410 | if (unlikely(err)) { |
411 | if (log_ecn_error) |
412 | net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n" , |
413 | &iph->saddr, iph->tos); |
414 | if (err > 1) { |
415 | DEV_STATS_INC(tunnel->dev, rx_frame_errors); |
416 | DEV_STATS_INC(tunnel->dev, rx_errors); |
417 | goto drop; |
418 | } |
419 | } |
420 | |
421 | dev_sw_netstats_rx_add(dev: tunnel->dev, len: skb->len); |
422 | skb_scrub_packet(skb, xnet: !net_eq(net1: tunnel->net, net2: dev_net(dev: tunnel->dev))); |
423 | |
424 | if (tunnel->dev->type == ARPHRD_ETHER) { |
425 | skb->protocol = eth_type_trans(skb, dev: tunnel->dev); |
426 | skb_postpull_rcsum(skb, start: eth_hdr(skb), ETH_HLEN); |
427 | } else { |
428 | skb->dev = tunnel->dev; |
429 | } |
430 | |
431 | if (tun_dst) |
432 | skb_dst_set(skb, dst: (struct dst_entry *)tun_dst); |
433 | |
434 | gro_cells_receive(gcells: &tunnel->gro_cells, skb); |
435 | return 0; |
436 | |
437 | drop: |
438 | if (tun_dst) |
439 | dst_release(dst: (struct dst_entry *)tun_dst); |
440 | kfree_skb(skb); |
441 | return 0; |
442 | } |
443 | EXPORT_SYMBOL_GPL(ip_tunnel_rcv); |
444 | |
445 | int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *ops, |
446 | unsigned int num) |
447 | { |
448 | if (num >= MAX_IPTUN_ENCAP_OPS) |
449 | return -ERANGE; |
450 | |
451 | return !cmpxchg((const struct ip_tunnel_encap_ops **) |
452 | &iptun_encaps[num], |
453 | NULL, ops) ? 0 : -1; |
454 | } |
455 | EXPORT_SYMBOL(ip_tunnel_encap_add_ops); |
456 | |
457 | int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *ops, |
458 | unsigned int num) |
459 | { |
460 | int ret; |
461 | |
462 | if (num >= MAX_IPTUN_ENCAP_OPS) |
463 | return -ERANGE; |
464 | |
465 | ret = (cmpxchg((const struct ip_tunnel_encap_ops **) |
466 | &iptun_encaps[num], |
467 | ops, NULL) == ops) ? 0 : -1; |
468 | |
469 | synchronize_net(); |
470 | |
471 | return ret; |
472 | } |
473 | EXPORT_SYMBOL(ip_tunnel_encap_del_ops); |
474 | |
475 | int ip_tunnel_encap_setup(struct ip_tunnel *t, |
476 | struct ip_tunnel_encap *ipencap) |
477 | { |
478 | int hlen; |
479 | |
480 | memset(&t->encap, 0, sizeof(t->encap)); |
481 | |
482 | hlen = ip_encap_hlen(e: ipencap); |
483 | if (hlen < 0) |
484 | return hlen; |
485 | |
486 | t->encap.type = ipencap->type; |
487 | t->encap.sport = ipencap->sport; |
488 | t->encap.dport = ipencap->dport; |
489 | t->encap.flags = ipencap->flags; |
490 | |
491 | t->encap_hlen = hlen; |
492 | t->hlen = t->encap_hlen + t->tun_hlen; |
493 | |
494 | return 0; |
495 | } |
496 | EXPORT_SYMBOL_GPL(ip_tunnel_encap_setup); |
497 | |
498 | static int tnl_update_pmtu(struct net_device *dev, struct sk_buff *skb, |
499 | struct rtable *rt, __be16 df, |
500 | const struct iphdr *inner_iph, |
501 | int tunnel_hlen, __be32 dst, bool md) |
502 | { |
503 | struct ip_tunnel *tunnel = netdev_priv(dev); |
504 | int pkt_size; |
505 | int mtu; |
506 | |
507 | tunnel_hlen = md ? tunnel_hlen : tunnel->hlen; |
508 | pkt_size = skb->len - tunnel_hlen; |
509 | pkt_size -= dev->type == ARPHRD_ETHER ? dev->hard_header_len : 0; |
510 | |
511 | if (df) { |
512 | mtu = dst_mtu(dst: &rt->dst) - (sizeof(struct iphdr) + tunnel_hlen); |
513 | mtu -= dev->type == ARPHRD_ETHER ? dev->hard_header_len : 0; |
514 | } else { |
515 | mtu = skb_valid_dst(skb) ? dst_mtu(dst: skb_dst(skb)) : dev->mtu; |
516 | } |
517 | |
518 | if (skb_valid_dst(skb)) |
519 | skb_dst_update_pmtu_no_confirm(skb, mtu); |
520 | |
521 | if (skb->protocol == htons(ETH_P_IP)) { |
522 | if (!skb_is_gso(skb) && |
523 | (inner_iph->frag_off & htons(IP_DF)) && |
524 | mtu < pkt_size) { |
525 | icmp_ndo_send(skb_in: skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); |
526 | return -E2BIG; |
527 | } |
528 | } |
529 | #if IS_ENABLED(CONFIG_IPV6) |
530 | else if (skb->protocol == htons(ETH_P_IPV6)) { |
531 | struct rt6_info *rt6; |
532 | __be32 daddr; |
533 | |
534 | rt6 = skb_valid_dst(skb) ? (struct rt6_info *)skb_dst(skb) : |
535 | NULL; |
536 | daddr = md ? dst : tunnel->parms.iph.daddr; |
537 | |
538 | if (rt6 && mtu < dst_mtu(dst: skb_dst(skb)) && |
539 | mtu >= IPV6_MIN_MTU) { |
540 | if ((daddr && !ipv4_is_multicast(addr: daddr)) || |
541 | rt6->rt6i_dst.plen == 128) { |
542 | rt6->rt6i_flags |= RTF_MODIFIED; |
543 | dst_metric_set(dst: skb_dst(skb), RTAX_MTU, val: mtu); |
544 | } |
545 | } |
546 | |
547 | if (!skb_is_gso(skb) && mtu >= IPV6_MIN_MTU && |
548 | mtu < pkt_size) { |
549 | icmpv6_ndo_send(skb_in: skb, ICMPV6_PKT_TOOBIG, code: 0, info: mtu); |
550 | return -E2BIG; |
551 | } |
552 | } |
553 | #endif |
554 | return 0; |
555 | } |
556 | |
557 | void ip_md_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, |
558 | u8 proto, int tunnel_hlen) |
559 | { |
560 | struct ip_tunnel *tunnel = netdev_priv(dev); |
561 | u32 headroom = sizeof(struct iphdr); |
562 | struct ip_tunnel_info *tun_info; |
563 | const struct ip_tunnel_key *key; |
564 | const struct iphdr *inner_iph; |
565 | struct rtable *rt = NULL; |
566 | struct flowi4 fl4; |
567 | __be16 df = 0; |
568 | u8 tos, ttl; |
569 | bool use_cache; |
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(ipv6h: (const struct ipv6hdr *)inner_iph); |
584 | } |
585 | ip_tunnel_init_flow(fl4: &fl4, proto, daddr: key->u.ipv4.dst, saddr: key->u.ipv4.src, |
586 | key: tunnel_id_to_key32(tun_id: key->tun_id), RT_TOS(tos), |
587 | net: dev_net(dev), oif: 0, mark: skb->mark, tun_inner_hash: skb_get_hash(skb), |
588 | flow_flags: key->flow_flags); |
589 | |
590 | if (!tunnel_hlen) |
591 | tunnel_hlen = ip_encap_hlen(e: &tun_info->encap); |
592 | |
593 | if (ip_tunnel_encap(skb, e: &tun_info->encap, protocol: &proto, fl4: &fl4) < 0) |
594 | goto tx_error; |
595 | |
596 | use_cache = ip_tunnel_dst_cache_usable(skb, info: tun_info); |
597 | if (use_cache) |
598 | rt = dst_cache_get_ip4(dst_cache: &tun_info->dst_cache, saddr: &fl4.saddr); |
599 | if (!rt) { |
600 | rt = ip_route_output_key(net: tunnel->net, flp: &fl4); |
601 | if (IS_ERR(ptr: rt)) { |
602 | DEV_STATS_INC(dev, tx_carrier_errors); |
603 | goto tx_error; |
604 | } |
605 | if (use_cache) |
606 | dst_cache_set_ip4(dst_cache: &tun_info->dst_cache, dst: &rt->dst, |
607 | saddr: fl4.saddr); |
608 | } |
609 | if (rt->dst.dev == dev) { |
610 | ip_rt_put(rt); |
611 | DEV_STATS_INC(dev, collisions); |
612 | goto tx_error; |
613 | } |
614 | |
615 | if (key->tun_flags & TUNNEL_DONT_FRAGMENT) |
616 | df = htons(IP_DF); |
617 | if (tnl_update_pmtu(dev, skb, rt, df, inner_iph, tunnel_hlen, |
618 | dst: key->u.ipv4.dst, md: true)) { |
619 | ip_rt_put(rt); |
620 | goto tx_error; |
621 | } |
622 | |
623 | tos = ip_tunnel_ecn_encap(tos, iph: inner_iph, skb); |
624 | ttl = key->ttl; |
625 | if (ttl == 0) { |
626 | if (skb->protocol == htons(ETH_P_IP)) |
627 | ttl = inner_iph->ttl; |
628 | else if (skb->protocol == htons(ETH_P_IPV6)) |
629 | ttl = ((const struct ipv6hdr *)inner_iph)->hop_limit; |
630 | else |
631 | ttl = ip4_dst_hoplimit(dst: &rt->dst); |
632 | } |
633 | |
634 | headroom += LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len; |
635 | if (headroom > READ_ONCE(dev->needed_headroom)) |
636 | WRITE_ONCE(dev->needed_headroom, headroom); |
637 | |
638 | if (skb_cow_head(skb, READ_ONCE(dev->needed_headroom))) { |
639 | ip_rt_put(rt); |
640 | goto tx_dropped; |
641 | } |
642 | iptunnel_xmit(NULL, rt, skb, src: fl4.saddr, dst: fl4.daddr, proto, tos, ttl, |
643 | df, xnet: !net_eq(net1: tunnel->net, net2: dev_net(dev))); |
644 | return; |
645 | tx_error: |
646 | DEV_STATS_INC(dev, tx_errors); |
647 | goto kfree; |
648 | tx_dropped: |
649 | DEV_STATS_INC(dev, tx_dropped); |
650 | kfree: |
651 | kfree_skb(skb); |
652 | } |
653 | EXPORT_SYMBOL_GPL(ip_md_tunnel_xmit); |
654 | |
655 | void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, |
656 | const struct iphdr *tnl_params, u8 protocol) |
657 | { |
658 | struct ip_tunnel *tunnel = netdev_priv(dev); |
659 | struct ip_tunnel_info *tun_info = NULL; |
660 | const struct iphdr *inner_iph; |
661 | unsigned int max_headroom; /* The extra header space needed */ |
662 | struct rtable *rt = NULL; /* Route to the other host */ |
663 | __be16 payload_protocol; |
664 | bool use_cache = false; |
665 | struct flowi4 fl4; |
666 | bool md = false; |
667 | bool connected; |
668 | u8 tos, ttl; |
669 | __be32 dst; |
670 | __be16 df; |
671 | |
672 | inner_iph = (const struct iphdr *)skb_inner_network_header(skb); |
673 | connected = (tunnel->parms.iph.daddr != 0); |
674 | payload_protocol = skb_protocol(skb, skip_vlan: true); |
675 | |
676 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
677 | |
678 | dst = tnl_params->daddr; |
679 | if (dst == 0) { |
680 | /* NBMA tunnel */ |
681 | |
682 | if (!skb_dst(skb)) { |
683 | DEV_STATS_INC(dev, tx_fifo_errors); |
684 | goto tx_error; |
685 | } |
686 | |
687 | tun_info = skb_tunnel_info(skb); |
688 | if (tun_info && (tun_info->mode & IP_TUNNEL_INFO_TX) && |
689 | ip_tunnel_info_af(tun_info) == AF_INET && |
690 | tun_info->key.u.ipv4.dst) { |
691 | dst = tun_info->key.u.ipv4.dst; |
692 | md = true; |
693 | connected = true; |
694 | } else if (payload_protocol == htons(ETH_P_IP)) { |
695 | rt = skb_rtable(skb); |
696 | dst = rt_nexthop(rt, daddr: inner_iph->daddr); |
697 | } |
698 | #if IS_ENABLED(CONFIG_IPV6) |
699 | else if (payload_protocol == htons(ETH_P_IPV6)) { |
700 | const struct in6_addr *addr6; |
701 | struct neighbour *neigh; |
702 | bool do_tx_error_icmp; |
703 | int addr_type; |
704 | |
705 | neigh = dst_neigh_lookup(dst: skb_dst(skb), |
706 | daddr: &ipv6_hdr(skb)->daddr); |
707 | if (!neigh) |
708 | goto tx_error; |
709 | |
710 | addr6 = (const struct in6_addr *)&neigh->primary_key; |
711 | addr_type = ipv6_addr_type(addr: addr6); |
712 | |
713 | if (addr_type == IPV6_ADDR_ANY) { |
714 | addr6 = &ipv6_hdr(skb)->daddr; |
715 | addr_type = ipv6_addr_type(addr: addr6); |
716 | } |
717 | |
718 | if ((addr_type & IPV6_ADDR_COMPATv4) == 0) |
719 | do_tx_error_icmp = true; |
720 | else { |
721 | do_tx_error_icmp = false; |
722 | dst = addr6->s6_addr32[3]; |
723 | } |
724 | neigh_release(neigh); |
725 | if (do_tx_error_icmp) |
726 | goto tx_error_icmp; |
727 | } |
728 | #endif |
729 | else |
730 | goto tx_error; |
731 | |
732 | if (!md) |
733 | connected = false; |
734 | } |
735 | |
736 | tos = tnl_params->tos; |
737 | if (tos & 0x1) { |
738 | tos &= ~0x1; |
739 | if (payload_protocol == htons(ETH_P_IP)) { |
740 | tos = inner_iph->tos; |
741 | connected = false; |
742 | } else if (payload_protocol == htons(ETH_P_IPV6)) { |
743 | tos = ipv6_get_dsfield(ipv6h: (const struct ipv6hdr *)inner_iph); |
744 | connected = false; |
745 | } |
746 | } |
747 | |
748 | ip_tunnel_init_flow(fl4: &fl4, proto: protocol, daddr: dst, saddr: tnl_params->saddr, |
749 | key: tunnel->parms.o_key, RT_TOS(tos), |
750 | net: dev_net(dev), oif: tunnel->parms.link, |
751 | mark: tunnel->fwmark, tun_inner_hash: skb_get_hash(skb), flow_flags: 0); |
752 | |
753 | if (ip_tunnel_encap(skb, e: &tunnel->encap, protocol: &protocol, fl4: &fl4) < 0) |
754 | goto tx_error; |
755 | |
756 | if (connected && md) { |
757 | use_cache = ip_tunnel_dst_cache_usable(skb, info: tun_info); |
758 | if (use_cache) |
759 | rt = dst_cache_get_ip4(dst_cache: &tun_info->dst_cache, |
760 | saddr: &fl4.saddr); |
761 | } else { |
762 | rt = connected ? dst_cache_get_ip4(dst_cache: &tunnel->dst_cache, |
763 | saddr: &fl4.saddr) : NULL; |
764 | } |
765 | |
766 | if (!rt) { |
767 | rt = ip_route_output_key(net: tunnel->net, flp: &fl4); |
768 | |
769 | if (IS_ERR(ptr: rt)) { |
770 | DEV_STATS_INC(dev, tx_carrier_errors); |
771 | goto tx_error; |
772 | } |
773 | if (use_cache) |
774 | dst_cache_set_ip4(dst_cache: &tun_info->dst_cache, dst: &rt->dst, |
775 | saddr: fl4.saddr); |
776 | else if (!md && connected) |
777 | dst_cache_set_ip4(dst_cache: &tunnel->dst_cache, dst: &rt->dst, |
778 | saddr: fl4.saddr); |
779 | } |
780 | |
781 | if (rt->dst.dev == dev) { |
782 | ip_rt_put(rt); |
783 | DEV_STATS_INC(dev, collisions); |
784 | goto tx_error; |
785 | } |
786 | |
787 | df = tnl_params->frag_off; |
788 | if (payload_protocol == htons(ETH_P_IP) && !tunnel->ignore_df) |
789 | df |= (inner_iph->frag_off & htons(IP_DF)); |
790 | |
791 | if (tnl_update_pmtu(dev, skb, rt, df, inner_iph, tunnel_hlen: 0, dst: 0, md: false)) { |
792 | ip_rt_put(rt); |
793 | goto tx_error; |
794 | } |
795 | |
796 | if (tunnel->err_count > 0) { |
797 | if (time_before(jiffies, |
798 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { |
799 | tunnel->err_count--; |
800 | |
801 | dst_link_failure(skb); |
802 | } else |
803 | tunnel->err_count = 0; |
804 | } |
805 | |
806 | tos = ip_tunnel_ecn_encap(tos, iph: inner_iph, skb); |
807 | ttl = tnl_params->ttl; |
808 | if (ttl == 0) { |
809 | if (payload_protocol == htons(ETH_P_IP)) |
810 | ttl = inner_iph->ttl; |
811 | #if IS_ENABLED(CONFIG_IPV6) |
812 | else if (payload_protocol == htons(ETH_P_IPV6)) |
813 | ttl = ((const struct ipv6hdr *)inner_iph)->hop_limit; |
814 | #endif |
815 | else |
816 | ttl = ip4_dst_hoplimit(dst: &rt->dst); |
817 | } |
818 | |
819 | max_headroom = LL_RESERVED_SPACE(rt->dst.dev) + sizeof(struct iphdr) |
820 | + rt->dst.header_len + ip_encap_hlen(e: &tunnel->encap); |
821 | if (max_headroom > READ_ONCE(dev->needed_headroom)) |
822 | WRITE_ONCE(dev->needed_headroom, max_headroom); |
823 | |
824 | if (skb_cow_head(skb, READ_ONCE(dev->needed_headroom))) { |
825 | ip_rt_put(rt); |
826 | DEV_STATS_INC(dev, tx_dropped); |
827 | kfree_skb(skb); |
828 | return; |
829 | } |
830 | |
831 | iptunnel_xmit(NULL, rt, skb, src: fl4.saddr, dst: fl4.daddr, proto: protocol, tos, ttl, |
832 | df, xnet: !net_eq(net1: tunnel->net, net2: dev_net(dev))); |
833 | return; |
834 | |
835 | #if IS_ENABLED(CONFIG_IPV6) |
836 | tx_error_icmp: |
837 | dst_link_failure(skb); |
838 | #endif |
839 | tx_error: |
840 | DEV_STATS_INC(dev, tx_errors); |
841 | kfree_skb(skb); |
842 | } |
843 | EXPORT_SYMBOL_GPL(ip_tunnel_xmit); |
844 | |
845 | static void ip_tunnel_update(struct ip_tunnel_net *itn, |
846 | struct ip_tunnel *t, |
847 | struct net_device *dev, |
848 | struct ip_tunnel_parm *p, |
849 | bool set_mtu, |
850 | __u32 fwmark) |
851 | { |
852 | ip_tunnel_del(itn, t); |
853 | t->parms.iph.saddr = p->iph.saddr; |
854 | t->parms.iph.daddr = p->iph.daddr; |
855 | t->parms.i_key = p->i_key; |
856 | t->parms.o_key = p->o_key; |
857 | if (dev->type != ARPHRD_ETHER) { |
858 | __dev_addr_set(dev, addr: &p->iph.saddr, len: 4); |
859 | memcpy(dev->broadcast, &p->iph.daddr, 4); |
860 | } |
861 | ip_tunnel_add(itn, t); |
862 | |
863 | t->parms.iph.ttl = p->iph.ttl; |
864 | t->parms.iph.tos = p->iph.tos; |
865 | t->parms.iph.frag_off = p->iph.frag_off; |
866 | |
867 | if (t->parms.link != p->link || t->fwmark != fwmark) { |
868 | int mtu; |
869 | |
870 | t->parms.link = p->link; |
871 | t->fwmark = fwmark; |
872 | mtu = ip_tunnel_bind_dev(dev); |
873 | if (set_mtu) |
874 | dev->mtu = mtu; |
875 | } |
876 | dst_cache_reset(dst_cache: &t->dst_cache); |
877 | netdev_state_change(dev); |
878 | } |
879 | |
880 | int ip_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd) |
881 | { |
882 | int err = 0; |
883 | struct ip_tunnel *t = netdev_priv(dev); |
884 | struct net *net = t->net; |
885 | struct ip_tunnel_net *itn = net_generic(net, id: t->ip_tnl_net_id); |
886 | |
887 | switch (cmd) { |
888 | case SIOCGETTUNNEL: |
889 | if (dev == itn->fb_tunnel_dev) { |
890 | t = ip_tunnel_find(itn, parms: p, type: itn->fb_tunnel_dev->type); |
891 | if (!t) |
892 | t = netdev_priv(dev); |
893 | } |
894 | memcpy(p, &t->parms, sizeof(*p)); |
895 | break; |
896 | |
897 | case SIOCADDTUNNEL: |
898 | case SIOCCHGTUNNEL: |
899 | err = -EPERM; |
900 | if (!ns_capable(ns: net->user_ns, CAP_NET_ADMIN)) |
901 | goto done; |
902 | if (p->iph.ttl) |
903 | p->iph.frag_off |= htons(IP_DF); |
904 | if (!(p->i_flags & VTI_ISVTI)) { |
905 | if (!(p->i_flags & TUNNEL_KEY)) |
906 | p->i_key = 0; |
907 | if (!(p->o_flags & TUNNEL_KEY)) |
908 | p->o_key = 0; |
909 | } |
910 | |
911 | t = ip_tunnel_find(itn, parms: p, type: itn->type); |
912 | |
913 | if (cmd == SIOCADDTUNNEL) { |
914 | if (!t) { |
915 | t = ip_tunnel_create(net, itn, parms: p); |
916 | err = PTR_ERR_OR_ZERO(ptr: t); |
917 | break; |
918 | } |
919 | |
920 | err = -EEXIST; |
921 | break; |
922 | } |
923 | if (dev != itn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
924 | if (t) { |
925 | if (t->dev != dev) { |
926 | err = -EEXIST; |
927 | break; |
928 | } |
929 | } else { |
930 | unsigned int nflags = 0; |
931 | |
932 | if (ipv4_is_multicast(addr: p->iph.daddr)) |
933 | nflags = IFF_BROADCAST; |
934 | else if (p->iph.daddr) |
935 | nflags = IFF_POINTOPOINT; |
936 | |
937 | if ((dev->flags^nflags)&(IFF_POINTOPOINT|IFF_BROADCAST)) { |
938 | err = -EINVAL; |
939 | break; |
940 | } |
941 | |
942 | t = netdev_priv(dev); |
943 | } |
944 | } |
945 | |
946 | if (t) { |
947 | err = 0; |
948 | ip_tunnel_update(itn, t, dev, p, set_mtu: true, fwmark: 0); |
949 | } else { |
950 | err = -ENOENT; |
951 | } |
952 | break; |
953 | |
954 | case SIOCDELTUNNEL: |
955 | err = -EPERM; |
956 | if (!ns_capable(ns: net->user_ns, CAP_NET_ADMIN)) |
957 | goto done; |
958 | |
959 | if (dev == itn->fb_tunnel_dev) { |
960 | err = -ENOENT; |
961 | t = ip_tunnel_find(itn, parms: p, type: itn->fb_tunnel_dev->type); |
962 | if (!t) |
963 | goto done; |
964 | err = -EPERM; |
965 | if (t == netdev_priv(dev: itn->fb_tunnel_dev)) |
966 | goto done; |
967 | dev = t->dev; |
968 | } |
969 | unregister_netdevice(dev); |
970 | err = 0; |
971 | break; |
972 | |
973 | default: |
974 | err = -EINVAL; |
975 | } |
976 | |
977 | done: |
978 | return err; |
979 | } |
980 | EXPORT_SYMBOL_GPL(ip_tunnel_ctl); |
981 | |
982 | int ip_tunnel_siocdevprivate(struct net_device *dev, struct ifreq *ifr, |
983 | void __user *data, int cmd) |
984 | { |
985 | struct ip_tunnel_parm p; |
986 | int err; |
987 | |
988 | if (copy_from_user(to: &p, from: data, n: sizeof(p))) |
989 | return -EFAULT; |
990 | err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, cmd); |
991 | if (!err && copy_to_user(to: data, from: &p, n: sizeof(p))) |
992 | return -EFAULT; |
993 | return err; |
994 | } |
995 | EXPORT_SYMBOL_GPL(ip_tunnel_siocdevprivate); |
996 | |
997 | int __ip_tunnel_change_mtu(struct net_device *dev, int new_mtu, bool strict) |
998 | { |
999 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1000 | int t_hlen = tunnel->hlen + sizeof(struct iphdr); |
1001 | int max_mtu = IP_MAX_MTU - t_hlen; |
1002 | |
1003 | if (dev->type == ARPHRD_ETHER) |
1004 | max_mtu -= dev->hard_header_len; |
1005 | |
1006 | if (new_mtu < ETH_MIN_MTU) |
1007 | return -EINVAL; |
1008 | |
1009 | if (new_mtu > max_mtu) { |
1010 | if (strict) |
1011 | return -EINVAL; |
1012 | |
1013 | new_mtu = max_mtu; |
1014 | } |
1015 | |
1016 | dev->mtu = new_mtu; |
1017 | return 0; |
1018 | } |
1019 | EXPORT_SYMBOL_GPL(__ip_tunnel_change_mtu); |
1020 | |
1021 | int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu) |
1022 | { |
1023 | return __ip_tunnel_change_mtu(dev, new_mtu, true); |
1024 | } |
1025 | EXPORT_SYMBOL_GPL(ip_tunnel_change_mtu); |
1026 | |
1027 | static void ip_tunnel_dev_free(struct net_device *dev) |
1028 | { |
1029 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1030 | |
1031 | gro_cells_destroy(gcells: &tunnel->gro_cells); |
1032 | dst_cache_destroy(dst_cache: &tunnel->dst_cache); |
1033 | free_percpu(pdata: dev->tstats); |
1034 | } |
1035 | |
1036 | void ip_tunnel_dellink(struct net_device *dev, struct list_head *head) |
1037 | { |
1038 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1039 | struct ip_tunnel_net *itn; |
1040 | |
1041 | itn = net_generic(net: tunnel->net, id: tunnel->ip_tnl_net_id); |
1042 | |
1043 | if (itn->fb_tunnel_dev != dev) { |
1044 | ip_tunnel_del(itn, t: netdev_priv(dev)); |
1045 | unregister_netdevice_queue(dev, head); |
1046 | } |
1047 | } |
1048 | EXPORT_SYMBOL_GPL(ip_tunnel_dellink); |
1049 | |
1050 | struct net *ip_tunnel_get_link_net(const struct net_device *dev) |
1051 | { |
1052 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1053 | |
1054 | return tunnel->net; |
1055 | } |
1056 | EXPORT_SYMBOL(ip_tunnel_get_link_net); |
1057 | |
1058 | int ip_tunnel_get_iflink(const struct net_device *dev) |
1059 | { |
1060 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1061 | |
1062 | return tunnel->parms.link; |
1063 | } |
1064 | EXPORT_SYMBOL(ip_tunnel_get_iflink); |
1065 | |
1066 | int ip_tunnel_init_net(struct net *net, unsigned int ip_tnl_net_id, |
1067 | struct rtnl_link_ops *ops, char *devname) |
1068 | { |
1069 | struct ip_tunnel_net *itn = net_generic(net, id: ip_tnl_net_id); |
1070 | struct ip_tunnel_parm parms; |
1071 | unsigned int i; |
1072 | |
1073 | itn->rtnl_link_ops = ops; |
1074 | for (i = 0; i < IP_TNL_HASH_SIZE; i++) |
1075 | INIT_HLIST_HEAD(&itn->tunnels[i]); |
1076 | |
1077 | if (!ops || !net_has_fallback_tunnels(net)) { |
1078 | struct ip_tunnel_net *it_init_net; |
1079 | |
1080 | it_init_net = net_generic(net: &init_net, id: ip_tnl_net_id); |
1081 | itn->type = it_init_net->type; |
1082 | itn->fb_tunnel_dev = NULL; |
1083 | return 0; |
1084 | } |
1085 | |
1086 | memset(&parms, 0, sizeof(parms)); |
1087 | if (devname) |
1088 | strscpy(p: parms.name, q: devname, IFNAMSIZ); |
1089 | |
1090 | rtnl_lock(); |
1091 | itn->fb_tunnel_dev = __ip_tunnel_create(net, ops, parms: &parms); |
1092 | /* FB netdevice is special: we have one, and only one per netns. |
1093 | * Allowing to move it to another netns is clearly unsafe. |
1094 | */ |
1095 | if (!IS_ERR(ptr: itn->fb_tunnel_dev)) { |
1096 | itn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; |
1097 | itn->fb_tunnel_dev->mtu = ip_tunnel_bind_dev(dev: itn->fb_tunnel_dev); |
1098 | ip_tunnel_add(itn, t: netdev_priv(dev: itn->fb_tunnel_dev)); |
1099 | itn->type = itn->fb_tunnel_dev->type; |
1100 | } |
1101 | rtnl_unlock(); |
1102 | |
1103 | return PTR_ERR_OR_ZERO(ptr: itn->fb_tunnel_dev); |
1104 | } |
1105 | EXPORT_SYMBOL_GPL(ip_tunnel_init_net); |
1106 | |
1107 | static void ip_tunnel_destroy(struct net *net, struct ip_tunnel_net *itn, |
1108 | struct list_head *head, |
1109 | struct rtnl_link_ops *ops) |
1110 | { |
1111 | struct net_device *dev, *aux; |
1112 | int h; |
1113 | |
1114 | for_each_netdev_safe(net, dev, aux) |
1115 | if (dev->rtnl_link_ops == ops) |
1116 | unregister_netdevice_queue(dev, head); |
1117 | |
1118 | for (h = 0; h < IP_TNL_HASH_SIZE; h++) { |
1119 | struct ip_tunnel *t; |
1120 | struct hlist_node *n; |
1121 | struct hlist_head *thead = &itn->tunnels[h]; |
1122 | |
1123 | hlist_for_each_entry_safe(t, n, thead, hash_node) |
1124 | /* If dev is in the same netns, it has already |
1125 | * been added to the list by the previous loop. |
1126 | */ |
1127 | if (!net_eq(net1: dev_net(dev: t->dev), net2: net)) |
1128 | unregister_netdevice_queue(dev: t->dev, head); |
1129 | } |
1130 | } |
1131 | |
1132 | void ip_tunnel_delete_nets(struct list_head *net_list, unsigned int id, |
1133 | struct rtnl_link_ops *ops) |
1134 | { |
1135 | struct ip_tunnel_net *itn; |
1136 | struct net *net; |
1137 | LIST_HEAD(list); |
1138 | |
1139 | rtnl_lock(); |
1140 | list_for_each_entry(net, net_list, exit_list) { |
1141 | itn = net_generic(net, id); |
1142 | ip_tunnel_destroy(net, itn, head: &list, ops); |
1143 | } |
1144 | unregister_netdevice_many(head: &list); |
1145 | rtnl_unlock(); |
1146 | } |
1147 | EXPORT_SYMBOL_GPL(ip_tunnel_delete_nets); |
1148 | |
1149 | int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[], |
1150 | struct ip_tunnel_parm *p, __u32 fwmark) |
1151 | { |
1152 | struct ip_tunnel *nt; |
1153 | struct net *net = dev_net(dev); |
1154 | struct ip_tunnel_net *itn; |
1155 | int mtu; |
1156 | int err; |
1157 | |
1158 | nt = netdev_priv(dev); |
1159 | itn = net_generic(net, id: nt->ip_tnl_net_id); |
1160 | |
1161 | if (nt->collect_md) { |
1162 | if (rtnl_dereference(itn->collect_md_tun)) |
1163 | return -EEXIST; |
1164 | } else { |
1165 | if (ip_tunnel_find(itn, parms: p, type: dev->type)) |
1166 | return -EEXIST; |
1167 | } |
1168 | |
1169 | nt->net = net; |
1170 | nt->parms = *p; |
1171 | nt->fwmark = fwmark; |
1172 | err = register_netdevice(dev); |
1173 | if (err) |
1174 | goto err_register_netdevice; |
1175 | |
1176 | if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) |
1177 | eth_hw_addr_random(dev); |
1178 | |
1179 | mtu = ip_tunnel_bind_dev(dev); |
1180 | if (tb[IFLA_MTU]) { |
1181 | unsigned int max = IP_MAX_MTU - (nt->hlen + sizeof(struct iphdr)); |
1182 | |
1183 | if (dev->type == ARPHRD_ETHER) |
1184 | max -= dev->hard_header_len; |
1185 | |
1186 | mtu = clamp(dev->mtu, (unsigned int)ETH_MIN_MTU, max); |
1187 | } |
1188 | |
1189 | err = dev_set_mtu(dev, mtu); |
1190 | if (err) |
1191 | goto err_dev_set_mtu; |
1192 | |
1193 | ip_tunnel_add(itn, t: nt); |
1194 | return 0; |
1195 | |
1196 | err_dev_set_mtu: |
1197 | unregister_netdevice(dev); |
1198 | err_register_netdevice: |
1199 | return err; |
1200 | } |
1201 | EXPORT_SYMBOL_GPL(ip_tunnel_newlink); |
1202 | |
1203 | int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[], |
1204 | struct ip_tunnel_parm *p, __u32 fwmark) |
1205 | { |
1206 | struct ip_tunnel *t; |
1207 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1208 | struct net *net = tunnel->net; |
1209 | struct ip_tunnel_net *itn = net_generic(net, id: tunnel->ip_tnl_net_id); |
1210 | |
1211 | if (dev == itn->fb_tunnel_dev) |
1212 | return -EINVAL; |
1213 | |
1214 | t = ip_tunnel_find(itn, parms: p, type: dev->type); |
1215 | |
1216 | if (t) { |
1217 | if (t->dev != dev) |
1218 | return -EEXIST; |
1219 | } else { |
1220 | t = tunnel; |
1221 | |
1222 | if (dev->type != ARPHRD_ETHER) { |
1223 | unsigned int nflags = 0; |
1224 | |
1225 | if (ipv4_is_multicast(addr: p->iph.daddr)) |
1226 | nflags = IFF_BROADCAST; |
1227 | else if (p->iph.daddr) |
1228 | nflags = IFF_POINTOPOINT; |
1229 | |
1230 | if ((dev->flags ^ nflags) & |
1231 | (IFF_POINTOPOINT | IFF_BROADCAST)) |
1232 | return -EINVAL; |
1233 | } |
1234 | } |
1235 | |
1236 | ip_tunnel_update(itn, t, dev, p, set_mtu: !tb[IFLA_MTU], fwmark); |
1237 | return 0; |
1238 | } |
1239 | EXPORT_SYMBOL_GPL(ip_tunnel_changelink); |
1240 | |
1241 | int ip_tunnel_init(struct net_device *dev) |
1242 | { |
1243 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1244 | struct iphdr *iph = &tunnel->parms.iph; |
1245 | int err; |
1246 | |
1247 | dev->needs_free_netdev = true; |
1248 | dev->priv_destructor = ip_tunnel_dev_free; |
1249 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
1250 | if (!dev->tstats) |
1251 | return -ENOMEM; |
1252 | |
1253 | err = dst_cache_init(dst_cache: &tunnel->dst_cache, GFP_KERNEL); |
1254 | if (err) { |
1255 | free_percpu(pdata: dev->tstats); |
1256 | return err; |
1257 | } |
1258 | |
1259 | err = gro_cells_init(gcells: &tunnel->gro_cells, dev); |
1260 | if (err) { |
1261 | dst_cache_destroy(dst_cache: &tunnel->dst_cache); |
1262 | free_percpu(pdata: dev->tstats); |
1263 | return err; |
1264 | } |
1265 | |
1266 | tunnel->dev = dev; |
1267 | tunnel->net = dev_net(dev); |
1268 | strcpy(p: tunnel->parms.name, q: dev->name); |
1269 | iph->version = 4; |
1270 | iph->ihl = 5; |
1271 | |
1272 | if (tunnel->collect_md) |
1273 | netif_keep_dst(dev); |
1274 | return 0; |
1275 | } |
1276 | EXPORT_SYMBOL_GPL(ip_tunnel_init); |
1277 | |
1278 | void ip_tunnel_uninit(struct net_device *dev) |
1279 | { |
1280 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1281 | struct net *net = tunnel->net; |
1282 | struct ip_tunnel_net *itn; |
1283 | |
1284 | itn = net_generic(net, id: tunnel->ip_tnl_net_id); |
1285 | ip_tunnel_del(itn, t: netdev_priv(dev)); |
1286 | if (itn->fb_tunnel_dev == dev) |
1287 | WRITE_ONCE(itn->fb_tunnel_dev, NULL); |
1288 | |
1289 | dst_cache_reset(dst_cache: &tunnel->dst_cache); |
1290 | } |
1291 | EXPORT_SYMBOL_GPL(ip_tunnel_uninit); |
1292 | |
1293 | /* Do least required initialization, rest of init is done in tunnel_init call */ |
1294 | void ip_tunnel_setup(struct net_device *dev, unsigned int net_id) |
1295 | { |
1296 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1297 | tunnel->ip_tnl_net_id = net_id; |
1298 | } |
1299 | EXPORT_SYMBOL_GPL(ip_tunnel_setup); |
1300 | |
1301 | MODULE_LICENSE("GPL" ); |
1302 | |