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
ip_tunnel_hash(__be32 key,__be32 remote)53 static unsigned int ip_tunnel_hash(__be32 key, __be32 remote)
54 {
55 return hash_32((__force u32)key ^ (__force u32)remote,
56 IP_TNL_HASH_BITS);
57 }
58
ip_tunnel_key_match(const struct ip_tunnel_parm * p,__be16 flags,__be32 key)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 */
ip_tunnel_lookup(struct ip_tunnel_net * itn,int link,__be16 flags,__be32 remote,__be32 local,__be32 key)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(&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(&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, 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(local)))
132 continue;
133
134 if (!(t->dev->flags & IFF_UP))
135 continue;
136
137 if (!ip_tunnel_key_match(&t->parms, flags, key))
138 continue;
139
140 if (t->parms.link == link)
141 return t;
142 else if (!cand)
143 cand = t;
144 }
145
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(ndev);
169
170 return NULL;
171 }
172 EXPORT_SYMBOL_GPL(ip_tunnel_lookup);
173
ip_bucket(struct ip_tunnel_net * itn,struct ip_tunnel_parm * parms)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(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(i_key, remote);
190 return &itn->tunnels[h];
191 }
192
ip_tunnel_add(struct ip_tunnel_net * itn,struct ip_tunnel * t)193 static void ip_tunnel_add(struct ip_tunnel_net *itn, struct ip_tunnel *t)
194 {
195 struct hlist_head *head = ip_bucket(itn, &t->parms);
196
197 if (t->collect_md)
198 rcu_assign_pointer(itn->collect_md_tun, t);
199 hlist_add_head_rcu(&t->hash_node, head);
200 }
201
ip_tunnel_del(struct ip_tunnel_net * itn,struct ip_tunnel * t)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(&t->hash_node);
207 }
208
ip_tunnel_find(struct ip_tunnel_net * itn,struct ip_tunnel_parm * parms,int type)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(&t->parms, flags, key))
227 break;
228 }
229 return t;
230 }
231
__ip_tunnel_create(struct net * net,const struct rtnl_link_ops * ops,struct ip_tunnel_parm * parms)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(parms->name))
244 goto failed;
245 strscpy(name, parms->name, IFNAMSIZ);
246 } else {
247 if (strlen(ops->kind) > (IFNAMSIZ - 3))
248 goto failed;
249 strcpy(name, ops->kind);
250 strcat(name, "%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(err);
277 }
278
ip_tunnel_bind_dev(struct net_device * dev)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, iph->protocol, iph->daddr,
296 iph->saddr, tunnel->parms.o_key,
297 RT_TOS(iph->tos), dev_net(dev),
298 tunnel->parms.link, tunnel->fwmark, 0, 0);
299 rt = ip_route_output_key(tunnel->net, &fl4);
300
301 if (!IS_ERR(rt)) {
302 tdev = rt->dst.dev;
303 ip_rt_put(rt);
304 }
305 if (dev->type != ARPHRD_ETHER)
306 dev->flags |= IFF_POINTOPOINT;
307
308 dst_cache_reset(&tunnel->dst_cache);
309 }
310
311 if (!tdev && tunnel->parms.link)
312 tdev = __dev_get_by_index(tunnel->net, 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
ip_tunnel_create(struct net * net,struct ip_tunnel_net * itn,struct ip_tunnel_parm * parms)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, itn->rtnl_link_ops, parms);
339 if (IS_ERR(dev))
340 return ERR_CAST(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, nt);
355 return nt;
356
357 err_dev_set_mtu:
358 unregister_netdevice(dev);
359 return ERR_PTR(err);
360 }
361
ip_tunnel_md_udp_encap(struct sk_buff * skb,struct ip_tunnel_info * info)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
ip_tunnel_rcv(struct ip_tunnel * tunnel,struct sk_buff * skb,const struct tnl_ptk_info * tpi,struct metadata_dst * tun_dst,bool log_ecn_error)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 nh, err;
382
383 #ifdef CONFIG_NET_IPGRE_BROADCAST
384 if (ipv4_is_multicast(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 /* Save offset of outer header relative to skb->head,
408 * because we are going to reset the network header to the inner header
409 * and might change skb->head.
410 */
411 nh = skb_network_header(skb) - skb->head;
412
413 skb_set_network_header(skb, (tunnel->dev->type == ARPHRD_ETHER) ? ETH_HLEN : 0);
414
415 if (!pskb_inet_may_pull(skb)) {
416 DEV_STATS_INC(tunnel->dev, rx_length_errors);
417 DEV_STATS_INC(tunnel->dev, rx_errors);
418 goto drop;
419 }
420 iph = (struct iphdr *)(skb->head + nh);
421
422 err = IP_ECN_decapsulate(iph, skb);
423 if (unlikely(err)) {
424 if (log_ecn_error)
425 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
426 &iph->saddr, iph->tos);
427 if (err > 1) {
428 DEV_STATS_INC(tunnel->dev, rx_frame_errors);
429 DEV_STATS_INC(tunnel->dev, rx_errors);
430 goto drop;
431 }
432 }
433
434 dev_sw_netstats_rx_add(tunnel->dev, skb->len);
435 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev)));
436
437 if (tunnel->dev->type == ARPHRD_ETHER) {
438 skb->protocol = eth_type_trans(skb, tunnel->dev);
439 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
440 } else {
441 skb->dev = tunnel->dev;
442 }
443
444 if (tun_dst)
445 skb_dst_set(skb, (struct dst_entry *)tun_dst);
446
447 gro_cells_receive(&tunnel->gro_cells, skb);
448 return 0;
449
450 drop:
451 if (tun_dst)
452 dst_release((struct dst_entry *)tun_dst);
453 kfree_skb(skb);
454 return 0;
455 }
456 EXPORT_SYMBOL_GPL(ip_tunnel_rcv);
457
ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops * ops,unsigned int num)458 int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *ops,
459 unsigned int num)
460 {
461 if (num >= MAX_IPTUN_ENCAP_OPS)
462 return -ERANGE;
463
464 return !cmpxchg((const struct ip_tunnel_encap_ops **)
465 &iptun_encaps[num],
466 NULL, ops) ? 0 : -1;
467 }
468 EXPORT_SYMBOL(ip_tunnel_encap_add_ops);
469
ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops * ops,unsigned int num)470 int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *ops,
471 unsigned int num)
472 {
473 int ret;
474
475 if (num >= MAX_IPTUN_ENCAP_OPS)
476 return -ERANGE;
477
478 ret = (cmpxchg((const struct ip_tunnel_encap_ops **)
479 &iptun_encaps[num],
480 ops, NULL) == ops) ? 0 : -1;
481
482 synchronize_net();
483
484 return ret;
485 }
486 EXPORT_SYMBOL(ip_tunnel_encap_del_ops);
487
ip_tunnel_encap_setup(struct ip_tunnel * t,struct ip_tunnel_encap * ipencap)488 int ip_tunnel_encap_setup(struct ip_tunnel *t,
489 struct ip_tunnel_encap *ipencap)
490 {
491 int hlen;
492
493 memset(&t->encap, 0, sizeof(t->encap));
494
495 hlen = ip_encap_hlen(ipencap);
496 if (hlen < 0)
497 return hlen;
498
499 t->encap.type = ipencap->type;
500 t->encap.sport = ipencap->sport;
501 t->encap.dport = ipencap->dport;
502 t->encap.flags = ipencap->flags;
503
504 t->encap_hlen = hlen;
505 t->hlen = t->encap_hlen + t->tun_hlen;
506
507 return 0;
508 }
509 EXPORT_SYMBOL_GPL(ip_tunnel_encap_setup);
510
tnl_update_pmtu(struct net_device * dev,struct sk_buff * skb,struct rtable * rt,__be16 df,const struct iphdr * inner_iph,int tunnel_hlen,__be32 dst,bool md)511 static int tnl_update_pmtu(struct net_device *dev, struct sk_buff *skb,
512 struct rtable *rt, __be16 df,
513 const struct iphdr *inner_iph,
514 int tunnel_hlen, __be32 dst, bool md)
515 {
516 struct ip_tunnel *tunnel = netdev_priv(dev);
517 int pkt_size;
518 int mtu;
519
520 tunnel_hlen = md ? tunnel_hlen : tunnel->hlen;
521 pkt_size = skb->len - tunnel_hlen;
522 pkt_size -= dev->type == ARPHRD_ETHER ? dev->hard_header_len : 0;
523
524 if (df) {
525 mtu = dst_mtu(&rt->dst) - (sizeof(struct iphdr) + tunnel_hlen);
526 mtu -= dev->type == ARPHRD_ETHER ? dev->hard_header_len : 0;
527 } else {
528 mtu = skb_valid_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu;
529 }
530
531 if (skb_valid_dst(skb))
532 skb_dst_update_pmtu_no_confirm(skb, mtu);
533
534 if (skb->protocol == htons(ETH_P_IP)) {
535 if (!skb_is_gso(skb) &&
536 (inner_iph->frag_off & htons(IP_DF)) &&
537 mtu < pkt_size) {
538 icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
539 return -E2BIG;
540 }
541 }
542 #if IS_ENABLED(CONFIG_IPV6)
543 else if (skb->protocol == htons(ETH_P_IPV6)) {
544 struct rt6_info *rt6;
545 __be32 daddr;
546
547 rt6 = skb_valid_dst(skb) ? (struct rt6_info *)skb_dst(skb) :
548 NULL;
549 daddr = md ? dst : tunnel->parms.iph.daddr;
550
551 if (rt6 && mtu < dst_mtu(skb_dst(skb)) &&
552 mtu >= IPV6_MIN_MTU) {
553 if ((daddr && !ipv4_is_multicast(daddr)) ||
554 rt6->rt6i_dst.plen == 128) {
555 rt6->rt6i_flags |= RTF_MODIFIED;
556 dst_metric_set(skb_dst(skb), RTAX_MTU, mtu);
557 }
558 }
559
560 if (!skb_is_gso(skb) && mtu >= IPV6_MIN_MTU &&
561 mtu < pkt_size) {
562 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
563 return -E2BIG;
564 }
565 }
566 #endif
567 return 0;
568 }
569
ip_tunnel_adj_headroom(struct net_device * dev,unsigned int headroom)570 static void ip_tunnel_adj_headroom(struct net_device *dev, unsigned int headroom)
571 {
572 /* we must cap headroom to some upperlimit, else pskb_expand_head
573 * will overflow header offsets in skb_headers_offset_update().
574 */
575 static const unsigned int max_allowed = 512;
576
577 if (headroom > max_allowed)
578 headroom = max_allowed;
579
580 if (headroom > READ_ONCE(dev->needed_headroom))
581 WRITE_ONCE(dev->needed_headroom, headroom);
582 }
583
ip_md_tunnel_xmit(struct sk_buff * skb,struct net_device * dev,u8 proto,int tunnel_hlen)584 void ip_md_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
585 u8 proto, int tunnel_hlen)
586 {
587 struct ip_tunnel *tunnel = netdev_priv(dev);
588 u32 headroom = sizeof(struct iphdr);
589 struct ip_tunnel_info *tun_info;
590 const struct ip_tunnel_key *key;
591 const struct iphdr *inner_iph;
592 struct rtable *rt = NULL;
593 struct flowi4 fl4;
594 __be16 df = 0;
595 u8 tos, ttl;
596 bool use_cache;
597
598 tun_info = skb_tunnel_info(skb);
599 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
600 ip_tunnel_info_af(tun_info) != AF_INET))
601 goto tx_error;
602 key = &tun_info->key;
603 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
604 inner_iph = (const struct iphdr *)skb_inner_network_header(skb);
605 tos = key->tos;
606 if (tos == 1) {
607 if (skb->protocol == htons(ETH_P_IP))
608 tos = inner_iph->tos;
609 else if (skb->protocol == htons(ETH_P_IPV6))
610 tos = ipv6_get_dsfield((const struct ipv6hdr *)inner_iph);
611 }
612 ip_tunnel_init_flow(&fl4, proto, key->u.ipv4.dst, key->u.ipv4.src,
613 tunnel_id_to_key32(key->tun_id), RT_TOS(tos),
614 dev_net(dev), 0, skb->mark, skb_get_hash(skb),
615 key->flow_flags);
616
617 if (!tunnel_hlen)
618 tunnel_hlen = ip_encap_hlen(&tun_info->encap);
619
620 if (ip_tunnel_encap(skb, &tun_info->encap, &proto, &fl4) < 0)
621 goto tx_error;
622
623 use_cache = ip_tunnel_dst_cache_usable(skb, tun_info);
624 if (use_cache)
625 rt = dst_cache_get_ip4(&tun_info->dst_cache, &fl4.saddr);
626 if (!rt) {
627 rt = ip_route_output_key(tunnel->net, &fl4);
628 if (IS_ERR(rt)) {
629 DEV_STATS_INC(dev, tx_carrier_errors);
630 goto tx_error;
631 }
632 if (use_cache)
633 dst_cache_set_ip4(&tun_info->dst_cache, &rt->dst,
634 fl4.saddr);
635 }
636 if (rt->dst.dev == dev) {
637 ip_rt_put(rt);
638 DEV_STATS_INC(dev, collisions);
639 goto tx_error;
640 }
641
642 if (key->tun_flags & TUNNEL_DONT_FRAGMENT)
643 df = htons(IP_DF);
644 if (tnl_update_pmtu(dev, skb, rt, df, inner_iph, tunnel_hlen,
645 key->u.ipv4.dst, true)) {
646 ip_rt_put(rt);
647 goto tx_error;
648 }
649
650 tos = ip_tunnel_ecn_encap(tos, inner_iph, skb);
651 ttl = key->ttl;
652 if (ttl == 0) {
653 if (skb->protocol == htons(ETH_P_IP))
654 ttl = inner_iph->ttl;
655 else if (skb->protocol == htons(ETH_P_IPV6))
656 ttl = ((const struct ipv6hdr *)inner_iph)->hop_limit;
657 else
658 ttl = ip4_dst_hoplimit(&rt->dst);
659 }
660
661 headroom += LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len;
662 if (skb_cow_head(skb, headroom)) {
663 ip_rt_put(rt);
664 goto tx_dropped;
665 }
666
667 ip_tunnel_adj_headroom(dev, headroom);
668
669 iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, proto, tos, ttl,
670 df, !net_eq(tunnel->net, dev_net(dev)));
671 return;
672 tx_error:
673 DEV_STATS_INC(dev, tx_errors);
674 goto kfree;
675 tx_dropped:
676 DEV_STATS_INC(dev, tx_dropped);
677 kfree:
678 kfree_skb(skb);
679 }
680 EXPORT_SYMBOL_GPL(ip_md_tunnel_xmit);
681
ip_tunnel_xmit(struct sk_buff * skb,struct net_device * dev,const struct iphdr * tnl_params,u8 protocol)682 void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
683 const struct iphdr *tnl_params, u8 protocol)
684 {
685 struct ip_tunnel *tunnel = netdev_priv(dev);
686 struct ip_tunnel_info *tun_info = NULL;
687 const struct iphdr *inner_iph;
688 unsigned int max_headroom; /* The extra header space needed */
689 struct rtable *rt = NULL; /* Route to the other host */
690 __be16 payload_protocol;
691 bool use_cache = false;
692 struct flowi4 fl4;
693 bool md = false;
694 bool connected;
695 u8 tos, ttl;
696 __be32 dst;
697 __be16 df;
698
699 inner_iph = (const struct iphdr *)skb_inner_network_header(skb);
700 connected = (tunnel->parms.iph.daddr != 0);
701 payload_protocol = skb_protocol(skb, true);
702
703 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
704
705 dst = tnl_params->daddr;
706 if (dst == 0) {
707 /* NBMA tunnel */
708
709 if (!skb_dst(skb)) {
710 DEV_STATS_INC(dev, tx_fifo_errors);
711 goto tx_error;
712 }
713
714 tun_info = skb_tunnel_info(skb);
715 if (tun_info && (tun_info->mode & IP_TUNNEL_INFO_TX) &&
716 ip_tunnel_info_af(tun_info) == AF_INET &&
717 tun_info->key.u.ipv4.dst) {
718 dst = tun_info->key.u.ipv4.dst;
719 md = true;
720 connected = true;
721 } else if (payload_protocol == htons(ETH_P_IP)) {
722 rt = skb_rtable(skb);
723 dst = rt_nexthop(rt, inner_iph->daddr);
724 }
725 #if IS_ENABLED(CONFIG_IPV6)
726 else if (payload_protocol == htons(ETH_P_IPV6)) {
727 const struct in6_addr *addr6;
728 struct neighbour *neigh;
729 bool do_tx_error_icmp;
730 int addr_type;
731
732 neigh = dst_neigh_lookup(skb_dst(skb),
733 &ipv6_hdr(skb)->daddr);
734 if (!neigh)
735 goto tx_error;
736
737 addr6 = (const struct in6_addr *)&neigh->primary_key;
738 addr_type = ipv6_addr_type(addr6);
739
740 if (addr_type == IPV6_ADDR_ANY) {
741 addr6 = &ipv6_hdr(skb)->daddr;
742 addr_type = ipv6_addr_type(addr6);
743 }
744
745 if ((addr_type & IPV6_ADDR_COMPATv4) == 0)
746 do_tx_error_icmp = true;
747 else {
748 do_tx_error_icmp = false;
749 dst = addr6->s6_addr32[3];
750 }
751 neigh_release(neigh);
752 if (do_tx_error_icmp)
753 goto tx_error_icmp;
754 }
755 #endif
756 else
757 goto tx_error;
758
759 if (!md)
760 connected = false;
761 }
762
763 tos = tnl_params->tos;
764 if (tos & 0x1) {
765 tos &= ~0x1;
766 if (payload_protocol == htons(ETH_P_IP)) {
767 tos = inner_iph->tos;
768 connected = false;
769 } else if (payload_protocol == htons(ETH_P_IPV6)) {
770 tos = ipv6_get_dsfield((const struct ipv6hdr *)inner_iph);
771 connected = false;
772 }
773 }
774
775 ip_tunnel_init_flow(&fl4, protocol, dst, tnl_params->saddr,
776 tunnel->parms.o_key, RT_TOS(tos),
777 dev_net(dev), tunnel->parms.link,
778 tunnel->fwmark, skb_get_hash(skb), 0);
779
780 if (ip_tunnel_encap(skb, &tunnel->encap, &protocol, &fl4) < 0)
781 goto tx_error;
782
783 if (connected && md) {
784 use_cache = ip_tunnel_dst_cache_usable(skb, tun_info);
785 if (use_cache)
786 rt = dst_cache_get_ip4(&tun_info->dst_cache,
787 &fl4.saddr);
788 } else {
789 rt = connected ? dst_cache_get_ip4(&tunnel->dst_cache,
790 &fl4.saddr) : NULL;
791 }
792
793 if (!rt) {
794 rt = ip_route_output_key(tunnel->net, &fl4);
795
796 if (IS_ERR(rt)) {
797 DEV_STATS_INC(dev, tx_carrier_errors);
798 goto tx_error;
799 }
800 if (use_cache)
801 dst_cache_set_ip4(&tun_info->dst_cache, &rt->dst,
802 fl4.saddr);
803 else if (!md && connected)
804 dst_cache_set_ip4(&tunnel->dst_cache, &rt->dst,
805 fl4.saddr);
806 }
807
808 if (rt->dst.dev == dev) {
809 ip_rt_put(rt);
810 DEV_STATS_INC(dev, collisions);
811 goto tx_error;
812 }
813
814 df = tnl_params->frag_off;
815 if (payload_protocol == htons(ETH_P_IP) && !tunnel->ignore_df)
816 df |= (inner_iph->frag_off & htons(IP_DF));
817
818 if (tnl_update_pmtu(dev, skb, rt, df, inner_iph, 0, 0, false)) {
819 ip_rt_put(rt);
820 goto tx_error;
821 }
822
823 if (tunnel->err_count > 0) {
824 if (time_before(jiffies,
825 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
826 tunnel->err_count--;
827
828 dst_link_failure(skb);
829 } else
830 tunnel->err_count = 0;
831 }
832
833 tos = ip_tunnel_ecn_encap(tos, inner_iph, skb);
834 ttl = tnl_params->ttl;
835 if (ttl == 0) {
836 if (payload_protocol == htons(ETH_P_IP))
837 ttl = inner_iph->ttl;
838 #if IS_ENABLED(CONFIG_IPV6)
839 else if (payload_protocol == htons(ETH_P_IPV6))
840 ttl = ((const struct ipv6hdr *)inner_iph)->hop_limit;
841 #endif
842 else
843 ttl = ip4_dst_hoplimit(&rt->dst);
844 }
845
846 max_headroom = LL_RESERVED_SPACE(rt->dst.dev) + sizeof(struct iphdr)
847 + rt->dst.header_len + ip_encap_hlen(&tunnel->encap);
848
849 if (skb_cow_head(skb, max_headroom)) {
850 ip_rt_put(rt);
851 DEV_STATS_INC(dev, tx_dropped);
852 kfree_skb(skb);
853 return;
854 }
855
856 ip_tunnel_adj_headroom(dev, max_headroom);
857
858 iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, protocol, tos, ttl,
859 df, !net_eq(tunnel->net, dev_net(dev)));
860 return;
861
862 #if IS_ENABLED(CONFIG_IPV6)
863 tx_error_icmp:
864 dst_link_failure(skb);
865 #endif
866 tx_error:
867 DEV_STATS_INC(dev, tx_errors);
868 kfree_skb(skb);
869 }
870 EXPORT_SYMBOL_GPL(ip_tunnel_xmit);
871
ip_tunnel_update(struct ip_tunnel_net * itn,struct ip_tunnel * t,struct net_device * dev,struct ip_tunnel_parm * p,bool set_mtu,__u32 fwmark)872 static void ip_tunnel_update(struct ip_tunnel_net *itn,
873 struct ip_tunnel *t,
874 struct net_device *dev,
875 struct ip_tunnel_parm *p,
876 bool set_mtu,
877 __u32 fwmark)
878 {
879 ip_tunnel_del(itn, t);
880 t->parms.iph.saddr = p->iph.saddr;
881 t->parms.iph.daddr = p->iph.daddr;
882 t->parms.i_key = p->i_key;
883 t->parms.o_key = p->o_key;
884 if (dev->type != ARPHRD_ETHER) {
885 __dev_addr_set(dev, &p->iph.saddr, 4);
886 memcpy(dev->broadcast, &p->iph.daddr, 4);
887 }
888 ip_tunnel_add(itn, t);
889
890 t->parms.iph.ttl = p->iph.ttl;
891 t->parms.iph.tos = p->iph.tos;
892 t->parms.iph.frag_off = p->iph.frag_off;
893
894 if (t->parms.link != p->link || t->fwmark != fwmark) {
895 int mtu;
896
897 t->parms.link = p->link;
898 t->fwmark = fwmark;
899 mtu = ip_tunnel_bind_dev(dev);
900 if (set_mtu)
901 dev->mtu = mtu;
902 }
903 dst_cache_reset(&t->dst_cache);
904 netdev_state_change(dev);
905 }
906
ip_tunnel_ctl(struct net_device * dev,struct ip_tunnel_parm * p,int cmd)907 int ip_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd)
908 {
909 int err = 0;
910 struct ip_tunnel *t = netdev_priv(dev);
911 struct net *net = t->net;
912 struct ip_tunnel_net *itn = net_generic(net, t->ip_tnl_net_id);
913
914 switch (cmd) {
915 case SIOCGETTUNNEL:
916 if (dev == itn->fb_tunnel_dev) {
917 t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type);
918 if (!t)
919 t = netdev_priv(dev);
920 }
921 memcpy(p, &t->parms, sizeof(*p));
922 break;
923
924 case SIOCADDTUNNEL:
925 case SIOCCHGTUNNEL:
926 err = -EPERM;
927 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
928 goto done;
929 if (p->iph.ttl)
930 p->iph.frag_off |= htons(IP_DF);
931 if (!(p->i_flags & VTI_ISVTI)) {
932 if (!(p->i_flags & TUNNEL_KEY))
933 p->i_key = 0;
934 if (!(p->o_flags & TUNNEL_KEY))
935 p->o_key = 0;
936 }
937
938 t = ip_tunnel_find(itn, p, itn->type);
939
940 if (cmd == SIOCADDTUNNEL) {
941 if (!t) {
942 t = ip_tunnel_create(net, itn, p);
943 err = PTR_ERR_OR_ZERO(t);
944 break;
945 }
946
947 err = -EEXIST;
948 break;
949 }
950 if (dev != itn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
951 if (t) {
952 if (t->dev != dev) {
953 err = -EEXIST;
954 break;
955 }
956 } else {
957 unsigned int nflags = 0;
958
959 if (ipv4_is_multicast(p->iph.daddr))
960 nflags = IFF_BROADCAST;
961 else if (p->iph.daddr)
962 nflags = IFF_POINTOPOINT;
963
964 if ((dev->flags^nflags)&(IFF_POINTOPOINT|IFF_BROADCAST)) {
965 err = -EINVAL;
966 break;
967 }
968
969 t = netdev_priv(dev);
970 }
971 }
972
973 if (t) {
974 err = 0;
975 ip_tunnel_update(itn, t, dev, p, true, 0);
976 } else {
977 err = -ENOENT;
978 }
979 break;
980
981 case SIOCDELTUNNEL:
982 err = -EPERM;
983 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
984 goto done;
985
986 if (dev == itn->fb_tunnel_dev) {
987 err = -ENOENT;
988 t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type);
989 if (!t)
990 goto done;
991 err = -EPERM;
992 if (t == netdev_priv(itn->fb_tunnel_dev))
993 goto done;
994 dev = t->dev;
995 }
996 unregister_netdevice(dev);
997 err = 0;
998 break;
999
1000 default:
1001 err = -EINVAL;
1002 }
1003
1004 done:
1005 return err;
1006 }
1007 EXPORT_SYMBOL_GPL(ip_tunnel_ctl);
1008
ip_tunnel_siocdevprivate(struct net_device * dev,struct ifreq * ifr,void __user * data,int cmd)1009 int ip_tunnel_siocdevprivate(struct net_device *dev, struct ifreq *ifr,
1010 void __user *data, int cmd)
1011 {
1012 struct ip_tunnel_parm p;
1013 int err;
1014
1015 if (copy_from_user(&p, data, sizeof(p)))
1016 return -EFAULT;
1017 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, cmd);
1018 if (!err && copy_to_user(data, &p, sizeof(p)))
1019 return -EFAULT;
1020 return err;
1021 }
1022 EXPORT_SYMBOL_GPL(ip_tunnel_siocdevprivate);
1023
__ip_tunnel_change_mtu(struct net_device * dev,int new_mtu,bool strict)1024 int __ip_tunnel_change_mtu(struct net_device *dev, int new_mtu, bool strict)
1025 {
1026 struct ip_tunnel *tunnel = netdev_priv(dev);
1027 int t_hlen = tunnel->hlen + sizeof(struct iphdr);
1028 int max_mtu = IP_MAX_MTU - t_hlen;
1029
1030 if (dev->type == ARPHRD_ETHER)
1031 max_mtu -= dev->hard_header_len;
1032
1033 if (new_mtu < ETH_MIN_MTU)
1034 return -EINVAL;
1035
1036 if (new_mtu > max_mtu) {
1037 if (strict)
1038 return -EINVAL;
1039
1040 new_mtu = max_mtu;
1041 }
1042
1043 dev->mtu = new_mtu;
1044 return 0;
1045 }
1046 EXPORT_SYMBOL_GPL(__ip_tunnel_change_mtu);
1047
ip_tunnel_change_mtu(struct net_device * dev,int new_mtu)1048 int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu)
1049 {
1050 return __ip_tunnel_change_mtu(dev, new_mtu, true);
1051 }
1052 EXPORT_SYMBOL_GPL(ip_tunnel_change_mtu);
1053
ip_tunnel_dev_free(struct net_device * dev)1054 static void ip_tunnel_dev_free(struct net_device *dev)
1055 {
1056 struct ip_tunnel *tunnel = netdev_priv(dev);
1057
1058 gro_cells_destroy(&tunnel->gro_cells);
1059 dst_cache_destroy(&tunnel->dst_cache);
1060 free_percpu(dev->tstats);
1061 }
1062
ip_tunnel_dellink(struct net_device * dev,struct list_head * head)1063 void ip_tunnel_dellink(struct net_device *dev, struct list_head *head)
1064 {
1065 struct ip_tunnel *tunnel = netdev_priv(dev);
1066 struct ip_tunnel_net *itn;
1067
1068 itn = net_generic(tunnel->net, tunnel->ip_tnl_net_id);
1069
1070 if (itn->fb_tunnel_dev != dev) {
1071 ip_tunnel_del(itn, netdev_priv(dev));
1072 unregister_netdevice_queue(dev, head);
1073 }
1074 }
1075 EXPORT_SYMBOL_GPL(ip_tunnel_dellink);
1076
ip_tunnel_get_link_net(const struct net_device * dev)1077 struct net *ip_tunnel_get_link_net(const struct net_device *dev)
1078 {
1079 struct ip_tunnel *tunnel = netdev_priv(dev);
1080
1081 return tunnel->net;
1082 }
1083 EXPORT_SYMBOL(ip_tunnel_get_link_net);
1084
ip_tunnel_get_iflink(const struct net_device * dev)1085 int ip_tunnel_get_iflink(const struct net_device *dev)
1086 {
1087 struct ip_tunnel *tunnel = netdev_priv(dev);
1088
1089 return tunnel->parms.link;
1090 }
1091 EXPORT_SYMBOL(ip_tunnel_get_iflink);
1092
ip_tunnel_init_net(struct net * net,unsigned int ip_tnl_net_id,struct rtnl_link_ops * ops,char * devname)1093 int ip_tunnel_init_net(struct net *net, unsigned int ip_tnl_net_id,
1094 struct rtnl_link_ops *ops, char *devname)
1095 {
1096 struct ip_tunnel_net *itn = net_generic(net, ip_tnl_net_id);
1097 struct ip_tunnel_parm parms;
1098 unsigned int i;
1099
1100 itn->rtnl_link_ops = ops;
1101 for (i = 0; i < IP_TNL_HASH_SIZE; i++)
1102 INIT_HLIST_HEAD(&itn->tunnels[i]);
1103
1104 if (!ops || !net_has_fallback_tunnels(net)) {
1105 struct ip_tunnel_net *it_init_net;
1106
1107 it_init_net = net_generic(&init_net, ip_tnl_net_id);
1108 itn->type = it_init_net->type;
1109 itn->fb_tunnel_dev = NULL;
1110 return 0;
1111 }
1112
1113 memset(&parms, 0, sizeof(parms));
1114 if (devname)
1115 strscpy(parms.name, devname, IFNAMSIZ);
1116
1117 rtnl_lock();
1118 itn->fb_tunnel_dev = __ip_tunnel_create(net, ops, &parms);
1119 /* FB netdevice is special: we have one, and only one per netns.
1120 * Allowing to move it to another netns is clearly unsafe.
1121 */
1122 if (!IS_ERR(itn->fb_tunnel_dev)) {
1123 itn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1124 itn->fb_tunnel_dev->mtu = ip_tunnel_bind_dev(itn->fb_tunnel_dev);
1125 ip_tunnel_add(itn, netdev_priv(itn->fb_tunnel_dev));
1126 itn->type = itn->fb_tunnel_dev->type;
1127 }
1128 rtnl_unlock();
1129
1130 return PTR_ERR_OR_ZERO(itn->fb_tunnel_dev);
1131 }
1132 EXPORT_SYMBOL_GPL(ip_tunnel_init_net);
1133
ip_tunnel_destroy(struct net * net,struct ip_tunnel_net * itn,struct list_head * head,struct rtnl_link_ops * ops)1134 static void ip_tunnel_destroy(struct net *net, struct ip_tunnel_net *itn,
1135 struct list_head *head,
1136 struct rtnl_link_ops *ops)
1137 {
1138 struct net_device *dev, *aux;
1139 int h;
1140
1141 for_each_netdev_safe(net, dev, aux)
1142 if (dev->rtnl_link_ops == ops)
1143 unregister_netdevice_queue(dev, head);
1144
1145 for (h = 0; h < IP_TNL_HASH_SIZE; h++) {
1146 struct ip_tunnel *t;
1147 struct hlist_node *n;
1148 struct hlist_head *thead = &itn->tunnels[h];
1149
1150 hlist_for_each_entry_safe(t, n, thead, hash_node)
1151 /* If dev is in the same netns, it has already
1152 * been added to the list by the previous loop.
1153 */
1154 if (!net_eq(dev_net(t->dev), net))
1155 unregister_netdevice_queue(t->dev, head);
1156 }
1157 }
1158
ip_tunnel_delete_nets(struct list_head * net_list,unsigned int id,struct rtnl_link_ops * ops)1159 void ip_tunnel_delete_nets(struct list_head *net_list, unsigned int id,
1160 struct rtnl_link_ops *ops)
1161 {
1162 struct ip_tunnel_net *itn;
1163 struct net *net;
1164 LIST_HEAD(list);
1165
1166 rtnl_lock();
1167 list_for_each_entry(net, net_list, exit_list) {
1168 itn = net_generic(net, id);
1169 ip_tunnel_destroy(net, itn, &list, ops);
1170 }
1171 unregister_netdevice_many(&list);
1172 rtnl_unlock();
1173 }
1174 EXPORT_SYMBOL_GPL(ip_tunnel_delete_nets);
1175
ip_tunnel_newlink(struct net_device * dev,struct nlattr * tb[],struct ip_tunnel_parm * p,__u32 fwmark)1176 int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[],
1177 struct ip_tunnel_parm *p, __u32 fwmark)
1178 {
1179 struct ip_tunnel *nt;
1180 struct net *net = dev_net(dev);
1181 struct ip_tunnel_net *itn;
1182 int mtu;
1183 int err;
1184
1185 nt = netdev_priv(dev);
1186 itn = net_generic(net, nt->ip_tnl_net_id);
1187
1188 if (nt->collect_md) {
1189 if (rtnl_dereference(itn->collect_md_tun))
1190 return -EEXIST;
1191 } else {
1192 if (ip_tunnel_find(itn, p, dev->type))
1193 return -EEXIST;
1194 }
1195
1196 nt->net = net;
1197 nt->parms = *p;
1198 nt->fwmark = fwmark;
1199 err = register_netdevice(dev);
1200 if (err)
1201 goto err_register_netdevice;
1202
1203 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1204 eth_hw_addr_random(dev);
1205
1206 mtu = ip_tunnel_bind_dev(dev);
1207 if (tb[IFLA_MTU]) {
1208 unsigned int max = IP_MAX_MTU - (nt->hlen + sizeof(struct iphdr));
1209
1210 if (dev->type == ARPHRD_ETHER)
1211 max -= dev->hard_header_len;
1212
1213 mtu = clamp(dev->mtu, (unsigned int)ETH_MIN_MTU, max);
1214 }
1215
1216 err = dev_set_mtu(dev, mtu);
1217 if (err)
1218 goto err_dev_set_mtu;
1219
1220 ip_tunnel_add(itn, nt);
1221 return 0;
1222
1223 err_dev_set_mtu:
1224 unregister_netdevice(dev);
1225 err_register_netdevice:
1226 return err;
1227 }
1228 EXPORT_SYMBOL_GPL(ip_tunnel_newlink);
1229
ip_tunnel_changelink(struct net_device * dev,struct nlattr * tb[],struct ip_tunnel_parm * p,__u32 fwmark)1230 int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[],
1231 struct ip_tunnel_parm *p, __u32 fwmark)
1232 {
1233 struct ip_tunnel *t;
1234 struct ip_tunnel *tunnel = netdev_priv(dev);
1235 struct net *net = tunnel->net;
1236 struct ip_tunnel_net *itn = net_generic(net, tunnel->ip_tnl_net_id);
1237
1238 if (dev == itn->fb_tunnel_dev)
1239 return -EINVAL;
1240
1241 t = ip_tunnel_find(itn, p, dev->type);
1242
1243 if (t) {
1244 if (t->dev != dev)
1245 return -EEXIST;
1246 } else {
1247 t = tunnel;
1248
1249 if (dev->type != ARPHRD_ETHER) {
1250 unsigned int nflags = 0;
1251
1252 if (ipv4_is_multicast(p->iph.daddr))
1253 nflags = IFF_BROADCAST;
1254 else if (p->iph.daddr)
1255 nflags = IFF_POINTOPOINT;
1256
1257 if ((dev->flags ^ nflags) &
1258 (IFF_POINTOPOINT | IFF_BROADCAST))
1259 return -EINVAL;
1260 }
1261 }
1262
1263 ip_tunnel_update(itn, t, dev, p, !tb[IFLA_MTU], fwmark);
1264 return 0;
1265 }
1266 EXPORT_SYMBOL_GPL(ip_tunnel_changelink);
1267
ip_tunnel_init(struct net_device * dev)1268 int ip_tunnel_init(struct net_device *dev)
1269 {
1270 struct ip_tunnel *tunnel = netdev_priv(dev);
1271 struct iphdr *iph = &tunnel->parms.iph;
1272 int err;
1273
1274 dev->needs_free_netdev = true;
1275 dev->priv_destructor = ip_tunnel_dev_free;
1276 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1277 if (!dev->tstats)
1278 return -ENOMEM;
1279
1280 err = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1281 if (err) {
1282 free_percpu(dev->tstats);
1283 return err;
1284 }
1285
1286 err = gro_cells_init(&tunnel->gro_cells, dev);
1287 if (err) {
1288 dst_cache_destroy(&tunnel->dst_cache);
1289 free_percpu(dev->tstats);
1290 return err;
1291 }
1292
1293 tunnel->dev = dev;
1294 tunnel->net = dev_net(dev);
1295 strcpy(tunnel->parms.name, dev->name);
1296 iph->version = 4;
1297 iph->ihl = 5;
1298
1299 if (tunnel->collect_md)
1300 netif_keep_dst(dev);
1301 netdev_lockdep_set_classes(dev);
1302 return 0;
1303 }
1304 EXPORT_SYMBOL_GPL(ip_tunnel_init);
1305
ip_tunnel_uninit(struct net_device * dev)1306 void ip_tunnel_uninit(struct net_device *dev)
1307 {
1308 struct ip_tunnel *tunnel = netdev_priv(dev);
1309 struct net *net = tunnel->net;
1310 struct ip_tunnel_net *itn;
1311
1312 itn = net_generic(net, tunnel->ip_tnl_net_id);
1313 ip_tunnel_del(itn, netdev_priv(dev));
1314 if (itn->fb_tunnel_dev == dev)
1315 WRITE_ONCE(itn->fb_tunnel_dev, NULL);
1316
1317 dst_cache_reset(&tunnel->dst_cache);
1318 }
1319 EXPORT_SYMBOL_GPL(ip_tunnel_uninit);
1320
1321 /* Do least required initialization, rest of init is done in tunnel_init call */
ip_tunnel_setup(struct net_device * dev,unsigned int net_id)1322 void ip_tunnel_setup(struct net_device *dev, unsigned int net_id)
1323 {
1324 struct ip_tunnel *tunnel = netdev_priv(dev);
1325 tunnel->ip_tnl_net_id = net_id;
1326 }
1327 EXPORT_SYMBOL_GPL(ip_tunnel_setup);
1328
1329 MODULE_LICENSE("GPL");
1330