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Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
[deliverable/linux.git] / net / ipv4 / ip_tunnel.c
CommitLineData
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>
33#include <linux/mroute.h>
34#include <linux/init.h>
35#include <linux/in6.h>
36#include <linux/inetdevice.h>
37#include <linux/igmp.h>
38#include <linux/netfilter_ipv4.h>
39#include <linux/etherdevice.h>
40#include <linux/if_ether.h>
41#include <linux/if_vlan.h>
42#include <linux/rculist.h>
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>
57
58#if IS_ENABLED(CONFIG_IPV6)
59#include <net/ipv6.h>
60#include <net/ip6_fib.h>
61#include <net/ip6_route.h>
62#endif
63
64static unsigned int ip_tunnel_hash(struct ip_tunnel_net *itn,
65 __be32 key, __be32 remote)
66{
67 return hash_32((__force u32)key ^ (__force u32)remote,
68 IP_TNL_HASH_BITS);
69}
70
9a4aa9af
TH		 71static inline void __tunnel_dst_set(struct ip_tunnel_dst *idst,
72 struct dst_entry *dst)
7d442fab
TH		 73{
74 struct dst_entry *old_dst;
75
76 if (dst && (dst->flags & DST_NOCACHE))
77 dst = NULL;
78
9a4aa9af
TH		 79 spin_lock_bh(&idst->lock);
80 old_dst = rcu_dereference(idst->dst);
81 rcu_assign_pointer(idst->dst, dst);
7d442fab 82 dst_release(old_dst);
9a4aa9af 83 spin_unlock_bh(&idst->lock);
7d442fab
TH		 84}
85
86static inline void tunnel_dst_set(struct ip_tunnel *t, struct dst_entry *dst)
87{
9a4aa9af 88 __tunnel_dst_set(this_cpu_ptr(t->dst_cache), dst);
7d442fab
TH		 89}
90
91static inline void tunnel_dst_reset(struct ip_tunnel *t)
92{
93 tunnel_dst_set(t, NULL);
94}
95
9a4aa9af
TH		 96static void tunnel_dst_reset_all(struct ip_tunnel *t)
97{
98 int i;
99
100 for_each_possible_cpu(i)
101 __tunnel_dst_set(per_cpu_ptr(t->dst_cache, i), NULL);
102}
103
7d442fab
TH		 104static inline struct dst_entry *tunnel_dst_get(struct ip_tunnel *t)
105{
106 struct dst_entry *dst;
107
108 rcu_read_lock();
9a4aa9af 109 dst = rcu_dereference(this_cpu_ptr(t->dst_cache)->dst);
7d442fab
TH		 110 if (dst)
111 dst_hold(dst);
112 rcu_read_unlock();
113 return dst;
114}
115
116struct dst_entry *tunnel_dst_check(struct ip_tunnel *t, u32 cookie)
117{
118 struct dst_entry *dst = tunnel_dst_get(t);
119
120 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
121 tunnel_dst_reset(t);
122 return NULL;
123 }
124
125 return dst;
126}
127
c5441932
PS		 128/* Often modified stats are per cpu, other are shared (netdev->stats) */
129struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev,
130 struct rtnl_link_stats64 *tot)
131{
132 int i;
133
134 for_each_possible_cpu(i) {
8f84985f
LR		 135 const struct pcpu_sw_netstats *tstats =
136 per_cpu_ptr(dev->tstats, i);
c5441932
PS		 137 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
138 unsigned int start;
139
140 do {
141 start = u64_stats_fetch_begin_bh(&tstats->syncp);
142 rx_packets = tstats->rx_packets;
143 tx_packets = tstats->tx_packets;
144 rx_bytes = tstats->rx_bytes;
145 tx_bytes = tstats->tx_bytes;
146 } while (u64_stats_fetch_retry_bh(&tstats->syncp, start));
147
148 tot->rx_packets += rx_packets;
149 tot->tx_packets += tx_packets;
150 tot->rx_bytes += rx_bytes;
151 tot->tx_bytes += tx_bytes;
152 }
153
154 tot->multicast = dev->stats.multicast;
155
156 tot->rx_crc_errors = dev->stats.rx_crc_errors;
157 tot->rx_fifo_errors = dev->stats.rx_fifo_errors;
158 tot->rx_length_errors = dev->stats.rx_length_errors;
159 tot->rx_frame_errors = dev->stats.rx_frame_errors;
160 tot->rx_errors = dev->stats.rx_errors;
161
162 tot->tx_fifo_errors = dev->stats.tx_fifo_errors;
163 tot->tx_carrier_errors = dev->stats.tx_carrier_errors;
164 tot->tx_dropped = dev->stats.tx_dropped;
165 tot->tx_aborted_errors = dev->stats.tx_aborted_errors;
166 tot->tx_errors = dev->stats.tx_errors;
167
168 tot->collisions = dev->stats.collisions;
169
170 return tot;
171}
172EXPORT_SYMBOL_GPL(ip_tunnel_get_stats64);
173
174static bool ip_tunnel_key_match(const struct ip_tunnel_parm *p,
175 __be16 flags, __be32 key)
176{
177 if (p->i_flags & TUNNEL_KEY) {
178 if (flags & TUNNEL_KEY)
179 return key == p->i_key;
180 else
181 /* key expected, none present */
182 return false;
183 } else
184 return !(flags & TUNNEL_KEY);
185}
186
187/* Fallback tunnel: no source, no destination, no key, no options
188
189 Tunnel hash table:
190 We require exact key match i.e. if a key is present in packet
191 it will match only tunnel with the same key; if it is not present,
192 it will match only keyless tunnel.
193
194 All keysless packets, if not matched configured keyless tunnels
195 will match fallback tunnel.
196 Given src, dst and key, find appropriate for input tunnel.
197*/
198struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn,
199 int link, __be16 flags,
200 __be32 remote, __be32 local,
201 __be32 key)
202{
203 unsigned int hash;
204 struct ip_tunnel *t, *cand = NULL;
205 struct hlist_head *head;
206
207 hash = ip_tunnel_hash(itn, key, remote);
208 head = &itn->tunnels[hash];
209
210 hlist_for_each_entry_rcu(t, head, hash_node) {
211 if (local != t->parms.iph.saddr ||
212 remote != t->parms.iph.daddr ||
213 !(t->dev->flags & IFF_UP))
214 continue;
215
216 if (!ip_tunnel_key_match(&t->parms, flags, key))
217 continue;
218
219 if (t->parms.link == link)
220 return t;
221 else
222 cand = t;
223 }
224
225 hlist_for_each_entry_rcu(t, head, hash_node) {
226 if (remote != t->parms.iph.daddr ||
227 !(t->dev->flags & IFF_UP))
228 continue;
229
230 if (!ip_tunnel_key_match(&t->parms, flags, key))
231 continue;
232
233 if (t->parms.link == link)
234 return t;
235 else if (!cand)
236 cand = t;
237 }
238
239 hash = ip_tunnel_hash(itn, key, 0);
240 head = &itn->tunnels[hash];
241
242 hlist_for_each_entry_rcu(t, head, hash_node) {
243 if ((local != t->parms.iph.saddr &&
244 (local != t->parms.iph.daddr ||
245 !ipv4_is_multicast(local))) ||
246 !(t->dev->flags & IFF_UP))
247 continue;
248
249 if (!ip_tunnel_key_match(&t->parms, flags, key))
250 continue;
251
252 if (t->parms.link == link)
253 return t;
254 else if (!cand)
255 cand = t;
256 }
257
258 if (flags & TUNNEL_NO_KEY)
259 goto skip_key_lookup;
260
261 hlist_for_each_entry_rcu(t, head, hash_node) {
262 if (t->parms.i_key != key ||
263 !(t->dev->flags & IFF_UP))
264 continue;
265
266 if (t->parms.link == link)
267 return t;
268 else if (!cand)
269 cand = t;
270 }
271
272skip_key_lookup:
273 if (cand)
274 return cand;
275
276 if (itn->fb_tunnel_dev && itn->fb_tunnel_dev->flags & IFF_UP)
277 return netdev_priv(itn->fb_tunnel_dev);
278
279
280 return NULL;
281}
282EXPORT_SYMBOL_GPL(ip_tunnel_lookup);
283
284static struct hlist_head *ip_bucket(struct ip_tunnel_net *itn,
285 struct ip_tunnel_parm *parms)
286{
287 unsigned int h;
288 __be32 remote;
289
290 if (parms->iph.daddr && !ipv4_is_multicast(parms->iph.daddr))
291 remote = parms->iph.daddr;
292 else
293 remote = 0;
294
295 h = ip_tunnel_hash(itn, parms->i_key, remote);
296 return &itn->tunnels[h];
297}
298
299static void ip_tunnel_add(struct ip_tunnel_net *itn, struct ip_tunnel *t)
300{
301 struct hlist_head *head = ip_bucket(itn, &t->parms);
302
303 hlist_add_head_rcu(&t->hash_node, head);
304}
305
306static void ip_tunnel_del(struct ip_tunnel *t)
307{
308 hlist_del_init_rcu(&t->hash_node);
309}
310
311static struct ip_tunnel *ip_tunnel_find(struct ip_tunnel_net *itn,
312 struct ip_tunnel_parm *parms,
313 int type)
314{
315 __be32 remote = parms->iph.daddr;
316 __be32 local = parms->iph.saddr;
317 __be32 key = parms->i_key;
318 int link = parms->link;
319 struct ip_tunnel *t = NULL;
320 struct hlist_head *head = ip_bucket(itn, parms);
321
322 hlist_for_each_entry_rcu(t, head, hash_node) {
323 if (local == t->parms.iph.saddr &&
324 remote == t->parms.iph.daddr &&
325 key == t->parms.i_key &&
326 link == t->parms.link &&
327 type == t->dev->type)
328 break;
329 }
330 return t;
331}
332
333static struct net_device *__ip_tunnel_create(struct net *net,
334 const struct rtnl_link_ops *ops,
335 struct ip_tunnel_parm *parms)
336{
337 int err;
338 struct ip_tunnel *tunnel;
339 struct net_device *dev;
340 char name[IFNAMSIZ];
341
342 if (parms->name[0])
343 strlcpy(name, parms->name, IFNAMSIZ);
344 else {
54a5d382 345 if (strlen(ops->kind) > (IFNAMSIZ - 3)) {
c5441932
PS		 346 err = -E2BIG;
347 goto failed;
348 }
349 strlcpy(name, ops->kind, IFNAMSIZ);
350 strncat(name, "%d", 2);
351 }
352
353 ASSERT_RTNL();
354 dev = alloc_netdev(ops->priv_size, name, ops->setup);
355 if (!dev) {
356 err = -ENOMEM;
357 goto failed;
358 }
359 dev_net_set(dev, net);
360
361 dev->rtnl_link_ops = ops;
362
363 tunnel = netdev_priv(dev);
364 tunnel->parms = *parms;
5e6700b3 365 tunnel->net = net;
c5441932
PS		 366
367 err = register_netdevice(dev);
368 if (err)
369 goto failed_free;
370
371 return dev;
372
373failed_free:
374 free_netdev(dev);
375failed:
376 return ERR_PTR(err);
377}
378
7d442fab
TH		 379static inline void init_tunnel_flow(struct flowi4 *fl4,
380 int proto,
381 __be32 daddr, __be32 saddr,
382 __be32 key, __u8 tos, int oif)
c5441932
PS		 383{
384 memset(fl4, 0, sizeof(*fl4));
385 fl4->flowi4_oif = oif;
386 fl4->daddr = daddr;
387 fl4->saddr = saddr;
388 fl4->flowi4_tos = tos;
389 fl4->flowi4_proto = proto;
390 fl4->fl4_gre_key = key;
c5441932
PS		 391}
392
393static int ip_tunnel_bind_dev(struct net_device *dev)
394{
395 struct net_device *tdev = NULL;
396 struct ip_tunnel *tunnel = netdev_priv(dev);
397 const struct iphdr *iph;
398 int hlen = LL_MAX_HEADER;
399 int mtu = ETH_DATA_LEN;
400 int t_hlen = tunnel->hlen + sizeof(struct iphdr);
401
402 iph = &tunnel->parms.iph;
403
404 /* Guess output device to choose reasonable mtu and needed_headroom */
405 if (iph->daddr) {
406 struct flowi4 fl4;
407 struct rtable *rt;
408
7d442fab
TH		 409 init_tunnel_flow(&fl4, iph->protocol, iph->daddr,
410 iph->saddr, tunnel->parms.o_key,
411 RT_TOS(iph->tos), tunnel->parms.link);
412 rt = ip_route_output_key(tunnel->net, &fl4);
413
c5441932
PS		 414 if (!IS_ERR(rt)) {
415 tdev = rt->dst.dev;
7d442fab 416 tunnel_dst_set(tunnel, dst_clone(&rt->dst));
c5441932
PS		 417 ip_rt_put(rt);
418 }
419 if (dev->type != ARPHRD_ETHER)
420 dev->flags |= IFF_POINTOPOINT;
421 }
422
423 if (!tdev && tunnel->parms.link)
6c742e71 424 tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link);
c5441932
PS		 425
426 if (tdev) {
427 hlen = tdev->hard_header_len + tdev->needed_headroom;
428 mtu = tdev->mtu;
429 }
430 dev->iflink = tunnel->parms.link;
431
432 dev->needed_headroom = t_hlen + hlen;
433 mtu -= (dev->hard_header_len + t_hlen);
434
435 if (mtu < 68)
436 mtu = 68;
437
438 return mtu;
439}
440
441static struct ip_tunnel *ip_tunnel_create(struct net *net,
442 struct ip_tunnel_net *itn,
443 struct ip_tunnel_parm *parms)
444{
445 struct ip_tunnel *nt, *fbt;
446 struct net_device *dev;
447
448 BUG_ON(!itn->fb_tunnel_dev);
449 fbt = netdev_priv(itn->fb_tunnel_dev);
450 dev = __ip_tunnel_create(net, itn->fb_tunnel_dev->rtnl_link_ops, parms);
451 if (IS_ERR(dev))
452 return NULL;
453
454 dev->mtu = ip_tunnel_bind_dev(dev);
455
456 nt = netdev_priv(dev);
457 ip_tunnel_add(itn, nt);
458 return nt;
459}
460
461int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb,
462 const struct tnl_ptk_info *tpi, bool log_ecn_error)
463{
8f84985f 464 struct pcpu_sw_netstats *tstats;
c5441932
PS		 465 const struct iphdr *iph = ip_hdr(skb);
466 int err;
467
c5441932
PS		 468#ifdef CONFIG_NET_IPGRE_BROADCAST
469 if (ipv4_is_multicast(iph->daddr)) {
470 /* Looped back packet, drop it! */
471 if (rt_is_output_route(skb_rtable(skb)))
472 goto drop;
473 tunnel->dev->stats.multicast++;
474 skb->pkt_type = PACKET_BROADCAST;
475 }
476#endif
477
478 if ((!(tpi->flags&TUNNEL_CSUM) && (tunnel->parms.i_flags&TUNNEL_CSUM)) ||
479 ((tpi->flags&TUNNEL_CSUM) && !(tunnel->parms.i_flags&TUNNEL_CSUM))) {
480 tunnel->dev->stats.rx_crc_errors++;
481 tunnel->dev->stats.rx_errors++;
482 goto drop;
483 }
484
485 if (tunnel->parms.i_flags&TUNNEL_SEQ) {
486 if (!(tpi->flags&TUNNEL_SEQ) ||
487 (tunnel->i_seqno && (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) {
488 tunnel->dev->stats.rx_fifo_errors++;
489 tunnel->dev->stats.rx_errors++;
490 goto drop;
491 }
492 tunnel->i_seqno = ntohl(tpi->seq) + 1;
493 }
494
c5441932
PS		 495 err = IP_ECN_decapsulate(iph, skb);
496 if (unlikely(err)) {
497 if (log_ecn_error)
498 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
499 &iph->saddr, iph->tos);
500 if (err > 1) {
501 ++tunnel->dev->stats.rx_frame_errors;
502 ++tunnel->dev->stats.rx_errors;
503 goto drop;
504 }
505 }
506
507 tstats = this_cpu_ptr(tunnel->dev->tstats);
508 u64_stats_update_begin(&tstats->syncp);
509 tstats->rx_packets++;
510 tstats->rx_bytes += skb->len;
511 u64_stats_update_end(&tstats->syncp);
512
81b9eab5
AS		 513 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev)));
514
3d7b46cd
PS		 515 if (tunnel->dev->type == ARPHRD_ETHER) {
516 skb->protocol = eth_type_trans(skb, tunnel->dev);
517 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
518 } else {
519 skb->dev = tunnel->dev;
520 }
64261f23 521
c5441932
PS		 522 gro_cells_receive(&tunnel->gro_cells, skb);
523 return 0;
524
525drop:
526 kfree_skb(skb);
527 return 0;
528}
529EXPORT_SYMBOL_GPL(ip_tunnel_rcv);
530
23a3647b
PS		 531static int tnl_update_pmtu(struct net_device *dev, struct sk_buff *skb,
532 struct rtable *rt, __be16 df)
533{
534 struct ip_tunnel *tunnel = netdev_priv(dev);
8c91e162 535 int pkt_size = skb->len - tunnel->hlen - dev->hard_header_len;
23a3647b
PS		 536 int mtu;
537
538 if (df)
539 mtu = dst_mtu(&rt->dst) - dev->hard_header_len
540 - sizeof(struct iphdr) - tunnel->hlen;
541 else
542 mtu = skb_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu;
543
544 if (skb_dst(skb))
545 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
546
547 if (skb->protocol == htons(ETH_P_IP)) {
548 if (!skb_is_gso(skb) &&
549 (df & htons(IP_DF)) && mtu < pkt_size) {
550 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
551 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
552 return -E2BIG;
553 }
554 }
555#if IS_ENABLED(CONFIG_IPV6)
556 else if (skb->protocol == htons(ETH_P_IPV6)) {
557 struct rt6_info *rt6 = (struct rt6_info *)skb_dst(skb);
558
559 if (rt6 && mtu < dst_mtu(skb_dst(skb)) &&
560 mtu >= IPV6_MIN_MTU) {
561 if ((tunnel->parms.iph.daddr &&
562 !ipv4_is_multicast(tunnel->parms.iph.daddr)) ||
563 rt6->rt6i_dst.plen == 128) {
564 rt6->rt6i_flags |= RTF_MODIFIED;
565 dst_metric_set(skb_dst(skb), RTAX_MTU, mtu);
566 }
567 }
568
569 if (!skb_is_gso(skb) && mtu >= IPV6_MIN_MTU &&
570 mtu < pkt_size) {
571 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
572 return -E2BIG;
573 }
574 }
575#endif
576 return 0;
577}
578
c5441932 579void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
bf3d6a8f 580 const struct iphdr *tnl_params, const u8 protocol)
c5441932
PS		 581{
582 struct ip_tunnel *tunnel = netdev_priv(dev);
583 const struct iphdr *inner_iph;
c5441932
PS		 584 struct flowi4 fl4;
585 u8 tos, ttl;
586 __be16 df;
7d442fab 587 struct rtable *rt = NULL; /* Route to the other host */
c5441932
PS		 588 unsigned int max_headroom; /* The extra header space needed */
589 __be32 dst;
0e6fbc5b 590 int err;
7d442fab 591 bool connected = true;
c5441932
PS		 592
593 inner_iph = (const struct iphdr *)skb_inner_network_header(skb);
594
595 dst = tnl_params->daddr;
596 if (dst == 0) {
597 /* NBMA tunnel */
598
599 if (skb_dst(skb) == NULL) {
600 dev->stats.tx_fifo_errors++;
601 goto tx_error;
602 }
603
604 if (skb->protocol == htons(ETH_P_IP)) {
605 rt = skb_rtable(skb);
606 dst = rt_nexthop(rt, inner_iph->daddr);
607 }
608#if IS_ENABLED(CONFIG_IPV6)
609 else if (skb->protocol == htons(ETH_P_IPV6)) {
610 const struct in6_addr *addr6;
611 struct neighbour *neigh;
612 bool do_tx_error_icmp;
613 int addr_type;
614
615 neigh = dst_neigh_lookup(skb_dst(skb),
616 &ipv6_hdr(skb)->daddr);
617 if (neigh == NULL)
618 goto tx_error;
619
620 addr6 = (const struct in6_addr *)&neigh->primary_key;
621 addr_type = ipv6_addr_type(addr6);
622
623 if (addr_type == IPV6_ADDR_ANY) {
624 addr6 = &ipv6_hdr(skb)->daddr;
625 addr_type = ipv6_addr_type(addr6);
626 }
627
628 if ((addr_type & IPV6_ADDR_COMPATv4) == 0)
629 do_tx_error_icmp = true;
630 else {
631 do_tx_error_icmp = false;
632 dst = addr6->s6_addr32[3];
633 }
634 neigh_release(neigh);
635 if (do_tx_error_icmp)
636 goto tx_error_icmp;
637 }
638#endif
639 else
640 goto tx_error;
7d442fab
TH		 641
642 connected = false;
c5441932
PS		 643 }
644
645 tos = tnl_params->tos;
646 if (tos & 0x1) {
647 tos &= ~0x1;
7d442fab 648 if (skb->protocol == htons(ETH_P_IP)) {
c5441932 649 tos = inner_iph->tos;
7d442fab
TH		 650 connected = false;
651 } else if (skb->protocol == htons(ETH_P_IPV6)) {
c5441932 652 tos = ipv6_get_dsfield((const struct ipv6hdr *)inner_iph);
7d442fab
TH		 653 connected = false;
654 }
c5441932
PS		 655 }
656
7d442fab
TH		 657 init_tunnel_flow(&fl4, protocol, dst, tnl_params->saddr,
658 tunnel->parms.o_key, RT_TOS(tos), tunnel->parms.link);
659
660 if (connected)
661 rt = (struct rtable *)tunnel_dst_check(tunnel, 0);
662
663 if (!rt) {
664 rt = ip_route_output_key(tunnel->net, &fl4);
665
666 if (IS_ERR(rt)) {
667 dev->stats.tx_carrier_errors++;
668 goto tx_error;
669 }
670 if (connected)
671 tunnel_dst_set(tunnel, dst_clone(&rt->dst));
c5441932 672 }
7d442fab 673
0e6fbc5b 674 if (rt->dst.dev == dev) {
c5441932
PS		 675 ip_rt_put(rt);
676 dev->stats.collisions++;
677 goto tx_error;
678 }
c5441932 679
23a3647b
PS		 680 if (tnl_update_pmtu(dev, skb, rt, tnl_params->frag_off)) {
681 ip_rt_put(rt);
682 goto tx_error;
c5441932 683 }
c5441932
PS		 684
685 if (tunnel->err_count > 0) {
686 if (time_before(jiffies,
687 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
688 tunnel->err_count--;
689
690 dst_link_failure(skb);
691 } else
692 tunnel->err_count = 0;
693 }
694
d4a71b15 695 tos = ip_tunnel_ecn_encap(tos, inner_iph, skb);
c5441932
PS		 696 ttl = tnl_params->ttl;
697 if (ttl == 0) {
698 if (skb->protocol == htons(ETH_P_IP))
699 ttl = inner_iph->ttl;
700#if IS_ENABLED(CONFIG_IPV6)
701 else if (skb->protocol == htons(ETH_P_IPV6))
702 ttl = ((const struct ipv6hdr *)inner_iph)->hop_limit;
703#endif
704 else
705 ttl = ip4_dst_hoplimit(&rt->dst);
706 }
707
23a3647b
PS		 708 df = tnl_params->frag_off;
709 if (skb->protocol == htons(ETH_P_IP))
710 df |= (inner_iph->frag_off&htons(IP_DF));
711
0e6fbc5b
PS		 712 max_headroom = LL_RESERVED_SPACE(rt->dst.dev) + sizeof(struct iphdr)
713 + rt->dst.header_len;
3e08f4a7 714 if (max_headroom > dev->needed_headroom)
c5441932 715 dev->needed_headroom = max_headroom;
3e08f4a7
SK		 716
717 if (skb_cow_head(skb, dev->needed_headroom)) {
718 dev->stats.tx_dropped++;
719 dev_kfree_skb(skb);
720 return;
c5441932
PS		 721 }
722
8b7ed2d9 723 err = iptunnel_xmit(rt, skb, fl4.saddr, fl4.daddr, protocol,
d4a71b15 724 tos, ttl, df, !net_eq(tunnel->net, dev_net(dev)));
0e6fbc5b 725 iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
c5441932 726
c5441932
PS		 727 return;
728
729#if IS_ENABLED(CONFIG_IPV6)
730tx_error_icmp:
731 dst_link_failure(skb);
732#endif
733tx_error:
734 dev->stats.tx_errors++;
735 dev_kfree_skb(skb);
736}
737EXPORT_SYMBOL_GPL(ip_tunnel_xmit);
738
739static void ip_tunnel_update(struct ip_tunnel_net *itn,
740 struct ip_tunnel *t,
741 struct net_device *dev,
742 struct ip_tunnel_parm *p,
743 bool set_mtu)
744{
745 ip_tunnel_del(t);
746 t->parms.iph.saddr = p->iph.saddr;
747 t->parms.iph.daddr = p->iph.daddr;
748 t->parms.i_key = p->i_key;
749 t->parms.o_key = p->o_key;
750 if (dev->type != ARPHRD_ETHER) {
751 memcpy(dev->dev_addr, &p->iph.saddr, 4);
752 memcpy(dev->broadcast, &p->iph.daddr, 4);
753 }
754 ip_tunnel_add(itn, t);
755
756 t->parms.iph.ttl = p->iph.ttl;
757 t->parms.iph.tos = p->iph.tos;
758 t->parms.iph.frag_off = p->iph.frag_off;
759
760 if (t->parms.link != p->link) {
761 int mtu;
762
763 t->parms.link = p->link;
764 mtu = ip_tunnel_bind_dev(dev);
765 if (set_mtu)
766 dev->mtu = mtu;
767 }
9a4aa9af 768 tunnel_dst_reset_all(t);
c5441932
PS		 769 netdev_state_change(dev);
770}
771
772int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd)
773{
774 int err = 0;
775 struct ip_tunnel *t;
776 struct net *net = dev_net(dev);
777 struct ip_tunnel *tunnel = netdev_priv(dev);
778 struct ip_tunnel_net *itn = net_generic(net, tunnel->ip_tnl_net_id);
779
780 BUG_ON(!itn->fb_tunnel_dev);
781 switch (cmd) {
782 case SIOCGETTUNNEL:
783 t = NULL;
784 if (dev == itn->fb_tunnel_dev)
785 t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type);
786 if (t == NULL)
787 t = netdev_priv(dev);
788 memcpy(p, &t->parms, sizeof(*p));
789 break;
790
791 case SIOCADDTUNNEL:
792 case SIOCCHGTUNNEL:
793 err = -EPERM;
794 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
795 goto done;
796 if (p->iph.ttl)
797 p->iph.frag_off |= htons(IP_DF);
798 if (!(p->i_flags&TUNNEL_KEY))
799 p->i_key = 0;
800 if (!(p->o_flags&TUNNEL_KEY))
801 p->o_key = 0;
802
803 t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type);
804
805 if (!t && (cmd == SIOCADDTUNNEL))
806 t = ip_tunnel_create(net, itn, p);
807
808 if (dev != itn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
809 if (t != NULL) {
810 if (t->dev != dev) {
811 err = -EEXIST;
812 break;
813 }
814 } else {
815 unsigned int nflags = 0;
816
817 if (ipv4_is_multicast(p->iph.daddr))
818 nflags = IFF_BROADCAST;
819 else if (p->iph.daddr)
820 nflags = IFF_POINTOPOINT;
821
822 if ((dev->flags^nflags)&(IFF_POINTOPOINT|IFF_BROADCAST)) {
823 err = -EINVAL;
824 break;
825 }
826
827 t = netdev_priv(dev);
828 }
829 }
830
831 if (t) {
832 err = 0;
833 ip_tunnel_update(itn, t, dev, p, true);
834 } else
835 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
836 break;
837
838 case SIOCDELTUNNEL:
839 err = -EPERM;
840 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
841 goto done;
842
843 if (dev == itn->fb_tunnel_dev) {
844 err = -ENOENT;
845 t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type);
846 if (t == NULL)
847 goto done;
848 err = -EPERM;
849 if (t == netdev_priv(itn->fb_tunnel_dev))
850 goto done;
851 dev = t->dev;
852 }
853 unregister_netdevice(dev);
854 err = 0;
855 break;
856
857 default:
858 err = -EINVAL;
859 }
860
861done:
862 return err;
863}
864EXPORT_SYMBOL_GPL(ip_tunnel_ioctl);
865
866int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu)
867{
868 struct ip_tunnel *tunnel = netdev_priv(dev);
869 int t_hlen = tunnel->hlen + sizeof(struct iphdr);
870
871 if (new_mtu < 68 ||
872 new_mtu > 0xFFF8 - dev->hard_header_len - t_hlen)
873 return -EINVAL;
874 dev->mtu = new_mtu;
875 return 0;
876}
877EXPORT_SYMBOL_GPL(ip_tunnel_change_mtu);
878
879static void ip_tunnel_dev_free(struct net_device *dev)
880{
881 struct ip_tunnel *tunnel = netdev_priv(dev);
882
883 gro_cells_destroy(&tunnel->gro_cells);
9a4aa9af 884 free_percpu(tunnel->dst_cache);
c5441932
PS		 885 free_percpu(dev->tstats);
886 free_netdev(dev);
887}
888
889void ip_tunnel_dellink(struct net_device *dev, struct list_head *head)
890{
c5441932
PS		 891 struct ip_tunnel *tunnel = netdev_priv(dev);
892 struct ip_tunnel_net *itn;
893
6c742e71 894 itn = net_generic(tunnel->net, tunnel->ip_tnl_net_id);
c5441932
PS		 895
896 if (itn->fb_tunnel_dev != dev) {
897 ip_tunnel_del(netdev_priv(dev));
898 unregister_netdevice_queue(dev, head);
899 }
900}
901EXPORT_SYMBOL_GPL(ip_tunnel_dellink);
902
d3b6f614 903int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id,
c5441932
PS		 904 struct rtnl_link_ops *ops, char *devname)
905{
906 struct ip_tunnel_net *itn = net_generic(net, ip_tnl_net_id);
907 struct ip_tunnel_parm parms;
6261d983 908 unsigned int i;
c5441932 909
6261d983 910 for (i = 0; i < IP_TNL_HASH_SIZE; i++)
911 INIT_HLIST_HEAD(&itn->tunnels[i]);
c5441932
PS		 912
913 if (!ops) {
914 itn->fb_tunnel_dev = NULL;
915 return 0;
916 }
6261d983 917
c5441932
PS		 918 memset(&parms, 0, sizeof(parms));
919 if (devname)
920 strlcpy(parms.name, devname, IFNAMSIZ);
921
922 rtnl_lock();
923 itn->fb_tunnel_dev = __ip_tunnel_create(net, ops, &parms);
ea857f28
DC		 924 /* FB netdevice is special: we have one, and only one per netns.
925 * Allowing to move it to another netns is clearly unsafe.
926 */
67013282 927 if (!IS_ERR(itn->fb_tunnel_dev)) {
b4de77ad 928 itn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
67013282
SK		 929 ip_tunnel_add(itn, netdev_priv(itn->fb_tunnel_dev));
930 }
b4de77ad 931 rtnl_unlock();
c5441932 932
b4de77ad 933 return PTR_RET(itn->fb_tunnel_dev);
c5441932
PS		 934}
935EXPORT_SYMBOL_GPL(ip_tunnel_init_net);
936
6c742e71
ND		 937static void ip_tunnel_destroy(struct ip_tunnel_net *itn, struct list_head *head,
938 struct rtnl_link_ops *ops)
c5441932 939{
6c742e71
ND		 940 struct net *net = dev_net(itn->fb_tunnel_dev);
941 struct net_device *dev, *aux;
c5441932
PS		 942 int h;
943
6c742e71
ND		 944 for_each_netdev_safe(net, dev, aux)
945 if (dev->rtnl_link_ops == ops)
946 unregister_netdevice_queue(dev, head);
947
c5441932
PS		 948 for (h = 0; h < IP_TNL_HASH_SIZE; h++) {
949 struct ip_tunnel *t;
950 struct hlist_node *n;
951 struct hlist_head *thead = &itn->tunnels[h];
952
953 hlist_for_each_entry_safe(t, n, thead, hash_node)
6c742e71
ND		 954 /* If dev is in the same netns, it has already
955 * been added to the list by the previous loop.
956 */
957 if (!net_eq(dev_net(t->dev), net))
958 unregister_netdevice_queue(t->dev, head);
c5441932 959 }
c5441932
PS		 960}
961
6c742e71 962void ip_tunnel_delete_net(struct ip_tunnel_net *itn, struct rtnl_link_ops *ops)
c5441932
PS		 963{
964 LIST_HEAD(list);
965
966 rtnl_lock();
6c742e71 967 ip_tunnel_destroy(itn, &list, ops);
c5441932
PS		 968 unregister_netdevice_many(&list);
969 rtnl_unlock();
c5441932
PS		 970}
971EXPORT_SYMBOL_GPL(ip_tunnel_delete_net);
972
973int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[],
974 struct ip_tunnel_parm *p)
975{
976 struct ip_tunnel *nt;
977 struct net *net = dev_net(dev);
978 struct ip_tunnel_net *itn;
979 int mtu;
980 int err;
981
982 nt = netdev_priv(dev);
983 itn = net_generic(net, nt->ip_tnl_net_id);
984
985 if (ip_tunnel_find(itn, p, dev->type))
986 return -EEXIST;
987
5e6700b3 988 nt->net = net;
c5441932
PS		 989 nt->parms = *p;
990 err = register_netdevice(dev);
991 if (err)
992 goto out;
993
994 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
995 eth_hw_addr_random(dev);
996
997 mtu = ip_tunnel_bind_dev(dev);
998 if (!tb[IFLA_MTU])
999 dev->mtu = mtu;
1000
1001 ip_tunnel_add(itn, nt);
1002
1003out:
1004 return err;
1005}
1006EXPORT_SYMBOL_GPL(ip_tunnel_newlink);
1007
1008int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[],
1009 struct ip_tunnel_parm *p)
1010{
6c742e71 1011 struct ip_tunnel *t;
c5441932 1012 struct ip_tunnel *tunnel = netdev_priv(dev);
6c742e71 1013 struct net *net = tunnel->net;
c5441932
PS		 1014 struct ip_tunnel_net *itn = net_generic(net, tunnel->ip_tnl_net_id);
1015
1016 if (dev == itn->fb_tunnel_dev)
1017 return -EINVAL;
1018
c5441932
PS		 1019 t = ip_tunnel_find(itn, p, dev->type);
1020
1021 if (t) {
1022 if (t->dev != dev)
1023 return -EEXIST;
1024 } else {
6c742e71 1025 t = tunnel;
c5441932
PS		 1026
1027 if (dev->type != ARPHRD_ETHER) {
1028 unsigned int nflags = 0;
1029
1030 if (ipv4_is_multicast(p->iph.daddr))
1031 nflags = IFF_BROADCAST;
1032 else if (p->iph.daddr)
1033 nflags = IFF_POINTOPOINT;
1034
1035 if ((dev->flags ^ nflags) &
1036 (IFF_POINTOPOINT | IFF_BROADCAST))
1037 return -EINVAL;
1038 }
1039 }
1040
1041 ip_tunnel_update(itn, t, dev, p, !tb[IFLA_MTU]);
1042 return 0;
1043}
1044EXPORT_SYMBOL_GPL(ip_tunnel_changelink);
1045
1046int ip_tunnel_init(struct net_device *dev)
1047{
1048 struct ip_tunnel *tunnel = netdev_priv(dev);
1049 struct iphdr *iph = &tunnel->parms.iph;
827da44c 1050 int i, err;
c5441932
PS		 1051
1052 dev->destructor = ip_tunnel_dev_free;
8f84985f 1053 dev->tstats = alloc_percpu(struct pcpu_sw_netstats);
c5441932
PS		 1054 if (!dev->tstats)
1055 return -ENOMEM;
1056
827da44c 1057 for_each_possible_cpu(i) {
8f84985f 1058 struct pcpu_sw_netstats *ipt_stats;
827da44c
JS		 1059 ipt_stats = per_cpu_ptr(dev->tstats, i);
1060 u64_stats_init(&ipt_stats->syncp);
1061 }
1062
9a4aa9af
TH		 1063 tunnel->dst_cache = alloc_percpu(struct ip_tunnel_dst);
1064 if (!tunnel->dst_cache) {
1065 free_percpu(dev->tstats);
1066 return -ENOMEM;
1067 }
1068
1069 for_each_possible_cpu(i) {
1070 struct ip_tunnel_dst *idst = per_cpu_ptr(tunnel->dst_cache, i);
1071 idst-> dst = NULL;
1072 spin_lock_init(&idst->lock);
1073 }
1074
c5441932
PS		 1075 err = gro_cells_init(&tunnel->gro_cells, dev);
1076 if (err) {
9a4aa9af 1077 free_percpu(tunnel->dst_cache);
c5441932
PS		 1078 free_percpu(dev->tstats);
1079 return err;
1080 }
1081
1082 tunnel->dev = dev;
6c742e71 1083 tunnel->net = dev_net(dev);
c5441932
PS		 1084 strcpy(tunnel->parms.name, dev->name);
1085 iph->version = 4;
1086 iph->ihl = 5;
1087
1088 return 0;
1089}
1090EXPORT_SYMBOL_GPL(ip_tunnel_init);
1091
1092void ip_tunnel_uninit(struct net_device *dev)
1093{
c5441932 1094 struct ip_tunnel *tunnel = netdev_priv(dev);
6c742e71 1095 struct net *net = tunnel->net;
c5441932
PS		 1096 struct ip_tunnel_net *itn;
1097
1098 itn = net_generic(net, tunnel->ip_tnl_net_id);
1099 /* fb_tunnel_dev will be unregisted in net-exit call. */
1100 if (itn->fb_tunnel_dev != dev)
1101 ip_tunnel_del(netdev_priv(dev));
7d442fab 1102
9a4aa9af 1103 tunnel_dst_reset_all(tunnel);
c5441932
PS		 1104}
1105EXPORT_SYMBOL_GPL(ip_tunnel_uninit);
1106
1107/* Do least required initialization, rest of init is done in tunnel_init call */
1108void ip_tunnel_setup(struct net_device *dev, int net_id)
1109{
1110 struct ip_tunnel *tunnel = netdev_priv(dev);
1111 tunnel->ip_tnl_net_id = net_id;
1112}
1113EXPORT_SYMBOL_GPL(ip_tunnel_setup);
1114
1115MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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