]> Git Repo - linux.git/blame - net/ipv6/ip6_gre.c
projects / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
ipv6: Generic tunnel cleanup
[linux.git] / net / ipv6 / ip6_gre.c
CommitLineData
c12b395a 1/*
2 * GRE over IPv6 protocol decoder.
3 *
4 * Authors: Dmitry Kozlov ([email protected])
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 *
11 */
12
13#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14
15#include <linux/capability.h>
16#include <linux/module.h>
17#include <linux/types.h>
18#include <linux/kernel.h>
19#include <linux/slab.h>
20#include <linux/uaccess.h>
21#include <linux/skbuff.h>
22#include <linux/netdevice.h>
23#include <linux/in.h>
24#include <linux/tcp.h>
25#include <linux/udp.h>
26#include <linux/if_arp.h>
c12b395a 27#include <linux/init.h>
28#include <linux/in6.h>
29#include <linux/inetdevice.h>
30#include <linux/igmp.h>
31#include <linux/netfilter_ipv4.h>
32#include <linux/etherdevice.h>
33#include <linux/if_ether.h>
34#include <linux/hash.h>
35#include <linux/if_tunnel.h>
36#include <linux/ip6_tunnel.h>
37
38#include <net/sock.h>
39#include <net/ip.h>
c5441932 40#include <net/ip_tunnels.h>
c12b395a 41#include <net/icmp.h>
42#include <net/protocol.h>
43#include <net/addrconf.h>
44#include <net/arp.h>
45#include <net/checksum.h>
46#include <net/dsfield.h>
47#include <net/inet_ecn.h>
48#include <net/xfrm.h>
49#include <net/net_namespace.h>
50#include <net/netns/generic.h>
51#include <net/rtnetlink.h>
52
53#include <net/ipv6.h>
54#include <net/ip6_fib.h>
55#include <net/ip6_route.h>
56#include <net/ip6_tunnel.h>
308edfdf 57#include <net/gre.h>
c12b395a 58
59
eccc1bb8 60static bool log_ecn_error = true;
61module_param(log_ecn_error, bool, 0644);
62MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
63
c12b395a 64#define HASH_SIZE_SHIFT 5
65#define HASH_SIZE (1 << HASH_SIZE_SHIFT)
66
67static int ip6gre_net_id __read_mostly;
68struct ip6gre_net {
69 struct ip6_tnl __rcu *tunnels[4][HASH_SIZE];
70
71 struct net_device *fb_tunnel_dev;
72};
73
74static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
22f08069 75static struct rtnl_link_ops ip6gre_tap_ops __read_mostly;
c12b395a 76static int ip6gre_tunnel_init(struct net_device *dev);
77static void ip6gre_tunnel_setup(struct net_device *dev);
78static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
79static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
80
81/* Tunnel hash table */
82
83/*
84 4 hash tables:
85
86 3: (remote,local)
87 2: (remote,*)
88 1: (*,local)
89 0: (*,*)
90
91 We require exact key match i.e. if a key is present in packet
92 it will match only tunnel with the same key; if it is not present,
93 it will match only keyless tunnel.
94
95 All keysless packets, if not matched configured keyless tunnels
96 will match fallback tunnel.
97 */
98
99#define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(HASH_SIZE - 1))
100static u32 HASH_ADDR(const struct in6_addr *addr)
101{
102 u32 hash = ipv6_addr_hash(addr);
103
104 return hash_32(hash, HASH_SIZE_SHIFT);
105}
106
107#define tunnels_r_l tunnels[3]
108#define tunnels_r tunnels[2]
109#define tunnels_l tunnels[1]
110#define tunnels_wc tunnels[0]
c12b395a 111
c12b395a 112/* Given src, dst and key, find appropriate for input tunnel. */
113
114static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev,
115 const struct in6_addr *remote, const struct in6_addr *local,
116 __be32 key, __be16 gre_proto)
117{
118 struct net *net = dev_net(dev);
119 int link = dev->ifindex;
120 unsigned int h0 = HASH_ADDR(remote);
121 unsigned int h1 = HASH_KEY(key);
122 struct ip6_tnl *t, *cand = NULL;
123 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
124 int dev_type = (gre_proto == htons(ETH_P_TEB)) ?
125 ARPHRD_ETHER : ARPHRD_IP6GRE;
126 int score, cand_score = 4;
127
e086cadc 128 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
c12b395a 129 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
130 !ipv6_addr_equal(remote, &t->parms.raddr) ||
131 key != t->parms.i_key ||
132 !(t->dev->flags & IFF_UP))
133 continue;
134
135 if (t->dev->type != ARPHRD_IP6GRE &&
136 t->dev->type != dev_type)
137 continue;
138
139 score = 0;
140 if (t->parms.link != link)
141 score |= 1;
142 if (t->dev->type != dev_type)
143 score |= 2;
144 if (score == 0)
145 return t;
146
147 if (score < cand_score) {
148 cand = t;
149 cand_score = score;
150 }
151 }
152
e086cadc 153 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
c12b395a 154 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
155 key != t->parms.i_key ||
156 !(t->dev->flags & IFF_UP))
157 continue;
158
159 if (t->dev->type != ARPHRD_IP6GRE &&
160 t->dev->type != dev_type)
161 continue;
162
163 score = 0;
164 if (t->parms.link != link)
165 score |= 1;
166 if (t->dev->type != dev_type)
167 score |= 2;
168 if (score == 0)
169 return t;
170
171 if (score < cand_score) {
172 cand = t;
173 cand_score = score;
174 }
175 }
176
e086cadc 177 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
c12b395a 178 if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
179 (!ipv6_addr_equal(local, &t->parms.raddr) ||
180 !ipv6_addr_is_multicast(local))) ||
181 key != t->parms.i_key ||
182 !(t->dev->flags & IFF_UP))
183 continue;
184
185 if (t->dev->type != ARPHRD_IP6GRE &&
186 t->dev->type != dev_type)
187 continue;
188
189 score = 0;
190 if (t->parms.link != link)
191 score |= 1;
192 if (t->dev->type != dev_type)
193 score |= 2;
194 if (score == 0)
195 return t;
196
197 if (score < cand_score) {
198 cand = t;
199 cand_score = score;
200 }
201 }
202
e086cadc 203 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
c12b395a 204 if (t->parms.i_key != key ||
205 !(t->dev->flags & IFF_UP))
206 continue;
207
208 if (t->dev->type != ARPHRD_IP6GRE &&
209 t->dev->type != dev_type)
210 continue;
211
212 score = 0;
213 if (t->parms.link != link)
214 score |= 1;
215 if (t->dev->type != dev_type)
216 score |= 2;
217 if (score == 0)
218 return t;
219
220 if (score < cand_score) {
221 cand = t;
222 cand_score = score;
223 }
224 }
225
53b24b8f 226 if (cand)
c12b395a 227 return cand;
228
229 dev = ign->fb_tunnel_dev;
230 if (dev->flags & IFF_UP)
231 return netdev_priv(dev);
232
233 return NULL;
234}
235
236static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
237 const struct __ip6_tnl_parm *p)
238{
239 const struct in6_addr *remote = &p->raddr;
240 const struct in6_addr *local = &p->laddr;
241 unsigned int h = HASH_KEY(p->i_key);
242 int prio = 0;
243
244 if (!ipv6_addr_any(local))
245 prio |= 1;
246 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
247 prio |= 2;
248 h ^= HASH_ADDR(remote);
249 }
250
251 return &ign->tunnels[prio][h];
252}
253
254static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
255 const struct ip6_tnl *t)
256{
257 return __ip6gre_bucket(ign, &t->parms);
258}
259
260static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
261{
262 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
263
264 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
265 rcu_assign_pointer(*tp, t);
266}
267
268static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
269{
270 struct ip6_tnl __rcu **tp;
271 struct ip6_tnl *iter;
272
273 for (tp = ip6gre_bucket(ign, t);
274 (iter = rtnl_dereference(*tp)) != NULL;
275 tp = &iter->next) {
276 if (t == iter) {
277 rcu_assign_pointer(*tp, t->next);
278 break;
279 }
280 }
281}
282
283static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
284 const struct __ip6_tnl_parm *parms,
285 int type)
286{
287 const struct in6_addr *remote = &parms->raddr;
288 const struct in6_addr *local = &parms->laddr;
289 __be32 key = parms->i_key;
290 int link = parms->link;
291 struct ip6_tnl *t;
292 struct ip6_tnl __rcu **tp;
293 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
294
295 for (tp = __ip6gre_bucket(ign, parms);
296 (t = rtnl_dereference(*tp)) != NULL;
297 tp = &t->next)
298 if (ipv6_addr_equal(local, &t->parms.laddr) &&
299 ipv6_addr_equal(remote, &t->parms.raddr) &&
300 key == t->parms.i_key &&
301 link == t->parms.link &&
302 type == t->dev->type)
303 break;
304
305 return t;
306}
307
308static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
309 const struct __ip6_tnl_parm *parms, int create)
310{
311 struct ip6_tnl *t, *nt;
312 struct net_device *dev;
313 char name[IFNAMSIZ];
314 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
315
316 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
cd0a0bd9
SK		 317 if (t && create)
318 return NULL;
c12b395a 319 if (t || !create)
320 return t;
321
322 if (parms->name[0])
323 strlcpy(name, parms->name, IFNAMSIZ);
324 else
325 strcpy(name, "ip6gre%d");
326
c835a677
TG		 327 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
328 ip6gre_tunnel_setup);
c12b395a 329 if (!dev)
330 return NULL;
331
332 dev_net_set(dev, net);
333
334 nt = netdev_priv(dev);
335 nt->parms = *parms;
336 dev->rtnl_link_ops = &ip6gre_link_ops;
337
338 nt->dev = dev;
0bd87628 339 nt->net = dev_net(dev);
c12b395a 340 ip6gre_tnl_link_config(nt, 1);
341
342 if (register_netdevice(dev) < 0)
343 goto failed_free;
344
345 /* Can use a lockless transmit, unless we generate output sequences */
346 if (!(nt->parms.o_flags & GRE_SEQ))
347 dev->features |= NETIF_F_LLTX;
348
349 dev_hold(dev);
350 ip6gre_tunnel_link(ign, nt);
351 return nt;
352
353failed_free:
354 free_netdev(dev);
355 return NULL;
356}
357
358static void ip6gre_tunnel_uninit(struct net_device *dev)
359{
22f08069
ND		 360 struct ip6_tnl *t = netdev_priv(dev);
361 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
c12b395a 362
22f08069 363 ip6gre_tunnel_unlink(ign, t);
607f725f 364 dst_cache_reset(&t->dst_cache);
c12b395a 365 dev_put(dev);
366}
367
368
369static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
370 u8 type, u8 code, int offset, __be32 info)
371{
372 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data;
b87fb39e
ED		 373 __be16 *p = (__be16 *)(skb->data + offset);
374 int grehlen = offset + 4;
c12b395a 375 struct ip6_tnl *t;
376 __be16 flags;
377
378 flags = p[0];
379 if (flags&(GRE_CSUM|GRE_KEY|GRE_SEQ|GRE_ROUTING|GRE_VERSION)) {
380 if (flags&(GRE_VERSION|GRE_ROUTING))
381 return;
382 if (flags&GRE_KEY) {
383 grehlen += 4;
384 if (flags&GRE_CSUM)
385 grehlen += 4;
386 }
387 }
388
389 /* If only 8 bytes returned, keyed message will be dropped here */
b87fb39e 390 if (!pskb_may_pull(skb, grehlen))
c12b395a 391 return;
b87fb39e
ED		 392 ipv6h = (const struct ipv6hdr *)skb->data;
393 p = (__be16 *)(skb->data + offset);
c12b395a 394
c12b395a 395 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
396 flags & GRE_KEY ?
397 *(((__be32 *)p) + (grehlen / 4) - 1) : 0,
398 p[1]);
63159f29 399 if (!t)
0c5794a6 400 return;
c12b395a 401
402 switch (type) {
403 __u32 teli;
404 struct ipv6_tlv_tnl_enc_lim *tel;
405 __u32 mtu;
406 case ICMPV6_DEST_UNREACH:
a46496ce
MB		 407 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
408 t->parms.name);
c12b395a 409 break;
410 case ICMPV6_TIME_EXCEED:
411 if (code == ICMPV6_EXC_HOPLIMIT) {
a46496ce
MB		 412 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
413 t->parms.name);
c12b395a 414 }
415 break;
416 case ICMPV6_PARAMPROB:
417 teli = 0;
418 if (code == ICMPV6_HDR_FIELD)
419 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
420
d1e158e2 421 if (teli && teli == be32_to_cpu(info) - 2) {
c12b395a 422 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
423 if (tel->encap_limit == 0) {
a46496ce
MB		 424 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
425 t->parms.name);
c12b395a 426 }
427 } else {
a46496ce
MB		 428 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
429 t->parms.name);
c12b395a 430 }
431 break;
432 case ICMPV6_PKT_TOOBIG:
d1e158e2 433 mtu = be32_to_cpu(info) - offset;
c12b395a 434 if (mtu < IPV6_MIN_MTU)
435 mtu = IPV6_MIN_MTU;
436 t->dev->mtu = mtu;
437 break;
438 }
439
440 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
441 t->err_count++;
442 else
443 t->err_count = 1;
444 t->err_time = jiffies;
c12b395a 445}
446
308edfdf 447static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
c12b395a 448{
449 const struct ipv6hdr *ipv6h;
c12b395a 450 struct ip6_tnl *tunnel;
c12b395a 451
452 ipv6h = ipv6_hdr(skb);
c12b395a 453 tunnel = ip6gre_tunnel_lookup(skb->dev,
308edfdf
TH		 454 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
455 tpi->proto);
c12b395a 456 if (tunnel) {
308edfdf 457 ip6_tnl_rcv(tunnel, skb, tpi, NULL, false);
c12b395a 458
308edfdf
TH		 459 return PACKET_RCVD;
460 }
eccc1bb8 461
308edfdf
TH		 462 return PACKET_REJECT;
463}
eccc1bb8 464
308edfdf
TH		 465static int gre_rcv(struct sk_buff *skb)
466{
467 struct tnl_ptk_info tpi;
468 bool csum_err = false;
469 int hdr_len;
eccc1bb8 470
308edfdf
TH		 471 if (gre_parse_header(skb, &tpi, &csum_err, &hdr_len) < 0)
472 goto drop;
c12b395a 473
308edfdf
TH		 474 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
475 goto drop;
c12b395a 476
308edfdf 477 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
c12b395a 478 return 0;
c12b395a 479
308edfdf 480 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
c12b395a 481drop:
c12b395a 482 kfree_skb(skb);
483 return 0;
484}
485
486struct ipv6_tel_txoption {
487 struct ipv6_txoptions ops;
488 __u8 dst_opt[8];
489};
490
491static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
492{
493 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
494
495 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
496 opt->dst_opt[3] = 1;
497 opt->dst_opt[4] = encap_limit;
498 opt->dst_opt[5] = IPV6_TLV_PADN;
499 opt->dst_opt[6] = 1;
500
501 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
502 opt->ops.opt_nflen = 8;
503}
504
ac4eb009
AD		 505static __sum16 gre6_checksum(struct sk_buff *skb)
506{
507 __wsum csum;
508
509 if (skb->ip_summed == CHECKSUM_PARTIAL)
510 csum = lco_csum(skb);
511 else
512 csum = skb_checksum(skb, sizeof(struct ipv6hdr),
513 skb->len - sizeof(struct ipv6hdr), 0);
514 return csum_fold(csum);
515}
516
c12b395a 517static netdev_tx_t ip6gre_xmit2(struct sk_buff *skb,
518 struct net_device *dev,
519 __u8 dsfield,
520 struct flowi6 *fl6,
521 int encap_limit,
522 __u32 *pmtu)
523{
c12b395a 524 struct ip6_tnl *tunnel = netdev_priv(dev);
22f08069 525 struct net *net = tunnel->net;
c12b395a 526 struct net_device *tdev; /* Device to other host */
527 struct ipv6hdr *ipv6h; /* Our new IP header */
3a80e1fa 528 unsigned int min_headroom = 0; /* The extra header space needed */
c12b395a 529 int gre_hlen;
530 struct ipv6_tel_txoption opt;
531 int mtu;
532 struct dst_entry *dst = NULL, *ndst = NULL;
533 struct net_device_stats *stats = &tunnel->dev->stats;
534 int err = -1;
535 u8 proto;
54bc9bac 536 __be16 protocol;
c12b395a 537
538 if (dev->type == ARPHRD_ETHER)
539 IPCB(skb)->flags = 0;
540
541 if (dev->header_ops && dev->type == ARPHRD_IP6GRE) {
542 gre_hlen = 0;
543 ipv6h = (struct ipv6hdr *)skb->data;
544 fl6->daddr = ipv6h->daddr;
545 } else {
546 gre_hlen = tunnel->hlen;
547 fl6->daddr = tunnel->parms.raddr;
548 }
549
550 if (!fl6->flowi6_mark)
607f725f 551 dst = dst_cache_get(&tunnel->dst_cache);
c12b395a 552
553 if (!dst) {
cdf3464e 554 dst = ip6_route_output(net, NULL, fl6);
c12b395a 555
cdf3464e 556 if (dst->error)
c12b395a 557 goto tx_err_link_failure;
cdf3464e
MKL		 558 dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), NULL, 0);
559 if (IS_ERR(dst)) {
560 err = PTR_ERR(dst);
561 dst = NULL;
c12b395a 562 goto tx_err_link_failure;
563 }
cdf3464e 564 ndst = dst;
c12b395a 565 }
566
567 tdev = dst->dev;
568
569 if (tdev == dev) {
570 stats->collisions++;
571 net_warn_ratelimited("%s: Local routing loop detected!\n",
572 tunnel->parms.name);
573 goto tx_err_dst_release;
574 }
575
576 mtu = dst_mtu(dst) - sizeof(*ipv6h);
577 if (encap_limit >= 0) {
3a80e1fa 578 min_headroom += 8;
c12b395a 579 mtu -= 8;
580 }
581 if (mtu < IPV6_MIN_MTU)
582 mtu = IPV6_MIN_MTU;
583 if (skb_dst(skb))
584 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
3a80e1fa 585 if (skb->len > mtu && !skb_is_gso(skb)) {
c12b395a 586 *pmtu = mtu;
587 err = -EMSGSIZE;
588 goto tx_err_dst_release;
589 }
590
591 if (tunnel->err_count > 0) {
592 if (time_before(jiffies,
593 tunnel->err_time + IP6TUNNEL_ERR_TIMEO)) {
594 tunnel->err_count--;
595
596 dst_link_failure(skb);
597 } else
598 tunnel->err_count = 0;
599 }
600
963a88b3
ND		 601 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(dev)));
602
3a80e1fa 603 min_headroom += LL_RESERVED_SPACE(tdev) + gre_hlen + dst->header_len;
c12b395a 604
3a80e1fa
AD		 605 if (skb_headroom(skb) < min_headroom || skb_header_cloned(skb)) {
606 int head_delta = SKB_DATA_ALIGN(min_headroom -
607 skb_headroom(skb) +
608 16);
c12b395a 609
3a80e1fa
AD		 610 err = pskb_expand_head(skb, max_t(int, head_delta, 0),
611 0, GFP_ATOMIC);
612 if (min_headroom > dev->needed_headroom)
613 dev->needed_headroom = min_headroom;
614 if (unlikely(err))
615 goto tx_err_dst_release;
c12b395a 616 }
617
cdf3464e 618 if (!fl6->flowi6_mark && ndst)
607f725f 619 dst_cache_set_ip6(&tunnel->dst_cache, ndst, &fl6->saddr);
cdf3464e 620 skb_dst_set(skb, dst);
c12b395a 621
c12b395a 622 proto = NEXTHDR_GRE;
623 if (encap_limit >= 0) {
624 init_tel_txopt(&opt, encap_limit);
625 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
626 }
627
3a80e1fa
AD		 628 err = iptunnel_handle_offloads(skb,
629 (tunnel->parms.o_flags & GRE_CSUM) ?
630 SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
631 if (err)
632 goto tx_err_dst_release;
3d483058 633
c12b395a 634 skb_push(skb, gre_hlen);
635 skb_reset_network_header(skb);
ae782bb1 636 skb_set_transport_header(skb, sizeof(*ipv6h));
c12b395a 637
638 /*
639 * Push down and install the IP header.
640 */
641 ipv6h = ipv6_hdr(skb);
cb1ce2ef 642 ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield),
42240901 643 ip6_make_flowlabel(net, skb, fl6->flowlabel, true, fl6));
c12b395a 644 ipv6h->hop_limit = tunnel->parms.hop_limit;
645 ipv6h->nexthdr = proto;
646 ipv6h->saddr = fl6->saddr;
647 ipv6h->daddr = fl6->daddr;
648
649 ((__be16 *)(ipv6h + 1))[0] = tunnel->parms.o_flags;
54bc9bac
TH		 650 protocol = (dev->type == ARPHRD_ETHER) ?
651 htons(ETH_P_TEB) : skb->protocol;
652 ((__be16 *)(ipv6h + 1))[1] = protocol;
c12b395a 653
654 if (tunnel->parms.o_flags&(GRE_KEY|GRE_CSUM|GRE_SEQ)) {
655 __be32 *ptr = (__be32 *)(((u8 *)ipv6h) + tunnel->hlen - 4);
656
657 if (tunnel->parms.o_flags&GRE_SEQ) {
658 ++tunnel->o_seqno;
659 *ptr = htonl(tunnel->o_seqno);
660 ptr--;
661 }
662 if (tunnel->parms.o_flags&GRE_KEY) {
663 *ptr = tunnel->parms.o_key;
664 ptr--;
665 }
3a80e1fa
AD		 666 if ((tunnel->parms.o_flags & GRE_CSUM) &&
667 !(skb_shinfo(skb)->gso_type &
668 (SKB_GSO_GRE | SKB_GSO_GRE_CSUM))) {
c12b395a 669 *ptr = 0;
ac4eb009 670 *(__sum16 *)ptr = gre6_checksum(skb);
c12b395a 671 }
672 }
673
54bc9bac
TH		 674 skb_set_inner_protocol(skb, protocol);
675
79b16aad 676 ip6tunnel_xmit(NULL, skb, dev);
c12b395a 677 return 0;
678tx_err_link_failure:
679 stats->tx_carrier_errors++;
680 dst_link_failure(skb);
681tx_err_dst_release:
cdf3464e 682 dst_release(dst);
c12b395a 683 return err;
684}
685
686static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
687{
688 struct ip6_tnl *t = netdev_priv(dev);
689 const struct iphdr *iph = ip_hdr(skb);
690 int encap_limit = -1;
691 struct flowi6 fl6;
692 __u8 dsfield;
693 __u32 mtu;
694 int err;
695
5146d1f1
BH		 696 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
697
c12b395a 698 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
699 encap_limit = t->parms.encap_limit;
700
701 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
3be07244 702 fl6.flowi6_proto = IPPROTO_GRE;
c12b395a 703
704 dsfield = ipv4_get_dsfield(iph);
705
706 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
707 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
708 & IPV6_TCLASS_MASK;
709 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
710 fl6.flowi6_mark = skb->mark;
711
712 err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
713 if (err != 0) {
714 /* XXX: send ICMP error even if DF is not set. */
715 if (err == -EMSGSIZE)
716 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
717 htonl(mtu));
718 return -1;
719 }
720
721 return 0;
722}
723
724static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
725{
726 struct ip6_tnl *t = netdev_priv(dev);
727 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
728 int encap_limit = -1;
729 __u16 offset;
730 struct flowi6 fl6;
731 __u8 dsfield;
732 __u32 mtu;
733 int err;
734
735 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
736 return -1;
737
738 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
739 if (offset > 0) {
740 struct ipv6_tlv_tnl_enc_lim *tel;
741 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
742 if (tel->encap_limit == 0) {
743 icmpv6_send(skb, ICMPV6_PARAMPROB,
744 ICMPV6_HDR_FIELD, offset + 2);
745 return -1;
746 }
747 encap_limit = tel->encap_limit - 1;
748 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
749 encap_limit = t->parms.encap_limit;
750
751 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
3be07244 752 fl6.flowi6_proto = IPPROTO_GRE;
c12b395a 753
754 dsfield = ipv6_get_dsfield(ipv6h);
755 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
756 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
757 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
3308de2b 758 fl6.flowlabel |= ip6_flowlabel(ipv6h);
c12b395a 759 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
760 fl6.flowi6_mark = skb->mark;
761
762 err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
763 if (err != 0) {
764 if (err == -EMSGSIZE)
765 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
766 return -1;
767 }
768
769 return 0;
770}
771
772/**
773 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
774 * @t: the outgoing tunnel device
775 * @hdr: IPv6 header from the incoming packet
776 *
777 * Description:
778 * Avoid trivial tunneling loop by checking that tunnel exit-point
779 * doesn't match source of incoming packet.
780 *
781 * Return:
782 * 1 if conflict,
783 * 0 else
784 **/
785
786static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
787 const struct ipv6hdr *hdr)
788{
789 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
790}
791
792static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
793{
794 struct ip6_tnl *t = netdev_priv(dev);
795 int encap_limit = -1;
796 struct flowi6 fl6;
797 __u32 mtu;
798 int err;
799
800 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
801 encap_limit = t->parms.encap_limit;
802
803 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
804 fl6.flowi6_proto = skb->protocol;
805
806 err = ip6gre_xmit2(skb, dev, 0, &fl6, encap_limit, &mtu);
807
808 return err;
809}
810
811static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
812 struct net_device *dev)
813{
814 struct ip6_tnl *t = netdev_priv(dev);
815 struct net_device_stats *stats = &t->dev->stats;
816 int ret;
817
d5005140 818 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
41ab3e31 819 goto tx_err;
c12b395a 820
821 switch (skb->protocol) {
822 case htons(ETH_P_IP):
823 ret = ip6gre_xmit_ipv4(skb, dev);
824 break;
825 case htons(ETH_P_IPV6):
826 ret = ip6gre_xmit_ipv6(skb, dev);
827 break;
828 default:
829 ret = ip6gre_xmit_other(skb, dev);
830 break;
831 }
832
833 if (ret < 0)
834 goto tx_err;
835
836 return NETDEV_TX_OK;
837
838tx_err:
839 stats->tx_errors++;
840 stats->tx_dropped++;
841 kfree_skb(skb);
842 return NETDEV_TX_OK;
843}
844
845static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
846{
847 struct net_device *dev = t->dev;
848 struct __ip6_tnl_parm *p = &t->parms;
849 struct flowi6 *fl6 = &t->fl.u.ip6;
850 int addend = sizeof(struct ipv6hdr) + 4;
851
852 if (dev->type != ARPHRD_ETHER) {
853 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
854 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
855 }
856
857 /* Set up flowi template */
858 fl6->saddr = p->laddr;
859 fl6->daddr = p->raddr;
860 fl6->flowi6_oif = p->link;
861 fl6->flowlabel = 0;
862
863 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
864 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
865 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
866 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
867
868 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
869 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
870
871 if (p->flags&IP6_TNL_F_CAP_XMIT &&
872 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
873 dev->flags |= IFF_POINTOPOINT;
874 else
875 dev->flags &= ~IFF_POINTOPOINT;
876
c12b395a 877 /* Precalculate GRE options length */
878 if (t->parms.o_flags&(GRE_CSUM|GRE_KEY|GRE_SEQ)) {
879 if (t->parms.o_flags&GRE_CSUM)
880 addend += 4;
881 if (t->parms.o_flags&GRE_KEY)
882 addend += 4;
883 if (t->parms.o_flags&GRE_SEQ)
884 addend += 4;
885 }
bf581759 886 t->hlen = addend;
c12b395a 887
888 if (p->flags & IP6_TNL_F_CAP_XMIT) {
889 int strict = (ipv6_addr_type(&p->raddr) &
890 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
891
22f08069 892 struct rt6_info *rt = rt6_lookup(t->net,
c12b395a 893 &p->raddr, &p->laddr,
894 p->link, strict);
895
63159f29 896 if (!rt)
c12b395a 897 return;
898
899 if (rt->dst.dev) {
900 dev->hard_header_len = rt->dst.dev->hard_header_len + addend;
901
902 if (set_mtu) {
903 dev->mtu = rt->dst.dev->mtu - addend;
904 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
905 dev->mtu -= 8;
a9e242ca
AD		 906 if (dev->type == ARPHRD_ETHER)
907 dev->mtu -= ETH_HLEN;
c12b395a 908
909 if (dev->mtu < IPV6_MIN_MTU)
910 dev->mtu = IPV6_MIN_MTU;
911 }
912 }
94e187c0 913 ip6_rt_put(rt);
c12b395a 914 }
c12b395a 915}
916
917static int ip6gre_tnl_change(struct ip6_tnl *t,
918 const struct __ip6_tnl_parm *p, int set_mtu)
919{
920 t->parms.laddr = p->laddr;
921 t->parms.raddr = p->raddr;
922 t->parms.flags = p->flags;
923 t->parms.hop_limit = p->hop_limit;
924 t->parms.encap_limit = p->encap_limit;
925 t->parms.flowinfo = p->flowinfo;
926 t->parms.link = p->link;
927 t->parms.proto = p->proto;
928 t->parms.i_key = p->i_key;
929 t->parms.o_key = p->o_key;
930 t->parms.i_flags = p->i_flags;
931 t->parms.o_flags = p->o_flags;
607f725f 932 dst_cache_reset(&t->dst_cache);
c12b395a 933 ip6gre_tnl_link_config(t, set_mtu);
934 return 0;
935}
936
937static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
938 const struct ip6_tnl_parm2 *u)
939{
940 p->laddr = u->laddr;
941 p->raddr = u->raddr;
942 p->flags = u->flags;
943 p->hop_limit = u->hop_limit;
944 p->encap_limit = u->encap_limit;
945 p->flowinfo = u->flowinfo;
946 p->link = u->link;
947 p->i_key = u->i_key;
948 p->o_key = u->o_key;
949 p->i_flags = u->i_flags;
950 p->o_flags = u->o_flags;
951 memcpy(p->name, u->name, sizeof(u->name));
952}
953
954static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
955 const struct __ip6_tnl_parm *p)
956{
957 u->proto = IPPROTO_GRE;
958 u->laddr = p->laddr;
959 u->raddr = p->raddr;
960 u->flags = p->flags;
961 u->hop_limit = p->hop_limit;
962 u->encap_limit = p->encap_limit;
963 u->flowinfo = p->flowinfo;
964 u->link = p->link;
965 u->i_key = p->i_key;
966 u->o_key = p->o_key;
967 u->i_flags = p->i_flags;
968 u->o_flags = p->o_flags;
969 memcpy(u->name, p->name, sizeof(u->name));
970}
971
972static int ip6gre_tunnel_ioctl(struct net_device *dev,
973 struct ifreq *ifr, int cmd)
974{
975 int err = 0;
976 struct ip6_tnl_parm2 p;
977 struct __ip6_tnl_parm p1;
22f08069
ND		 978 struct ip6_tnl *t = netdev_priv(dev);
979 struct net *net = t->net;
c12b395a 980 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
981
308edfdf
TH		 982 memset(&p1, 0, sizeof(p1));
983
c12b395a 984 switch (cmd) {
985 case SIOCGETTUNNEL:
c12b395a 986 if (dev == ign->fb_tunnel_dev) {
987 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
988 err = -EFAULT;
989 break;
990 }
991 ip6gre_tnl_parm_from_user(&p1, &p);
992 t = ip6gre_tunnel_locate(net, &p1, 0);
63159f29 993 if (!t)
22f08069 994 t = netdev_priv(dev);
c12b395a 995 }
5dbd5068 996 memset(&p, 0, sizeof(p));
c12b395a 997 ip6gre_tnl_parm_to_user(&p, &t->parms);
998 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
999 err = -EFAULT;
1000 break;
1001
1002 case SIOCADDTUNNEL:
1003 case SIOCCHGTUNNEL:
1004 err = -EPERM;
af31f412 1005 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
c12b395a 1006 goto done;
1007
1008 err = -EFAULT;
1009 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1010 goto done;
1011
1012 err = -EINVAL;
1013 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1014 goto done;
1015
1016 if (!(p.i_flags&GRE_KEY))
1017 p.i_key = 0;
1018 if (!(p.o_flags&GRE_KEY))
1019 p.o_key = 0;
1020
1021 ip6gre_tnl_parm_from_user(&p1, &p);
1022 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1023
1024 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
53b24b8f 1025 if (t) {
c12b395a 1026 if (t->dev != dev) {
1027 err = -EEXIST;
1028 break;
1029 }
1030 } else {
1031 t = netdev_priv(dev);
1032
1033 ip6gre_tunnel_unlink(ign, t);
1034 synchronize_net();
1035 ip6gre_tnl_change(t, &p1, 1);
1036 ip6gre_tunnel_link(ign, t);
1037 netdev_state_change(dev);
1038 }
1039 }
1040
1041 if (t) {
1042 err = 0;
1043
5dbd5068 1044 memset(&p, 0, sizeof(p));
c12b395a 1045 ip6gre_tnl_parm_to_user(&p, &t->parms);
1046 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1047 err = -EFAULT;
1048 } else
1049 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1050 break;
1051
1052 case SIOCDELTUNNEL:
1053 err = -EPERM;
af31f412 1054 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
c12b395a 1055 goto done;
1056
1057 if (dev == ign->fb_tunnel_dev) {
1058 err = -EFAULT;
1059 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1060 goto done;
1061 err = -ENOENT;
1062 ip6gre_tnl_parm_from_user(&p1, &p);
1063 t = ip6gre_tunnel_locate(net, &p1, 0);
63159f29 1064 if (!t)
c12b395a 1065 goto done;
1066 err = -EPERM;
1067 if (t == netdev_priv(ign->fb_tunnel_dev))
1068 goto done;
1069 dev = t->dev;
1070 }
1071 unregister_netdevice(dev);
1072 err = 0;
1073 break;
1074
1075 default:
1076 err = -EINVAL;
1077 }
1078
1079done:
1080 return err;
1081}
1082
1083static int ip6gre_tunnel_change_mtu(struct net_device *dev, int new_mtu)
1084{
c12b395a 1085 if (new_mtu < 68 ||
0e719e3a 1086 new_mtu > 0xFFF8 - dev->hard_header_len)
c12b395a 1087 return -EINVAL;
1088 dev->mtu = new_mtu;
1089 return 0;
1090}
1091
1092static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1093 unsigned short type,
1094 const void *daddr, const void *saddr, unsigned int len)
1095{
1096 struct ip6_tnl *t = netdev_priv(dev);
1097 struct ipv6hdr *ipv6h = (struct ipv6hdr *)skb_push(skb, t->hlen);
1098 __be16 *p = (__be16 *)(ipv6h+1);
1099
cb1ce2ef
TH		 1100 ip6_flow_hdr(ipv6h, 0,
1101 ip6_make_flowlabel(dev_net(dev), skb,
42240901 1102 t->fl.u.ip6.flowlabel, true,
67800f9b 1103 &t->fl.u.ip6));
c12b395a 1104 ipv6h->hop_limit = t->parms.hop_limit;
1105 ipv6h->nexthdr = NEXTHDR_GRE;
1106 ipv6h->saddr = t->parms.laddr;
1107 ipv6h->daddr = t->parms.raddr;
1108
1109 p[0] = t->parms.o_flags;
1110 p[1] = htons(type);
1111
1112 /*
1113 * Set the source hardware address.
1114 */
1115
1116 if (saddr)
1117 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1118 if (daddr)
1119 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1120 if (!ipv6_addr_any(&ipv6h->daddr))
1121 return t->hlen;
1122
1123 return -t->hlen;
1124}
1125
c12b395a 1126static const struct header_ops ip6gre_header_ops = {
1127 .create = ip6gre_header,
c12b395a 1128};
1129
1130static const struct net_device_ops ip6gre_netdev_ops = {
1131 .ndo_init = ip6gre_tunnel_init,
1132 .ndo_uninit = ip6gre_tunnel_uninit,
1133 .ndo_start_xmit = ip6gre_tunnel_xmit,
1134 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
1135 .ndo_change_mtu = ip6gre_tunnel_change_mtu,
f61dd388 1136 .ndo_get_stats64 = ip_tunnel_get_stats64,
ecf2c06a 1137 .ndo_get_iflink = ip6_tnl_get_iflink,
c12b395a 1138};
1139
1140static void ip6gre_dev_free(struct net_device *dev)
1141{
cdf3464e
MKL		 1142 struct ip6_tnl *t = netdev_priv(dev);
1143
607f725f 1144 dst_cache_destroy(&t->dst_cache);
c12b395a 1145 free_percpu(dev->tstats);
1146 free_netdev(dev);
1147}
1148
1149static void ip6gre_tunnel_setup(struct net_device *dev)
1150{
1151 struct ip6_tnl *t;
1152
1153 dev->netdev_ops = &ip6gre_netdev_ops;
1154 dev->destructor = ip6gre_dev_free;
1155
1156 dev->type = ARPHRD_IP6GRE;
1157 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr) + 4;
1158 dev->mtu = ETH_DATA_LEN - sizeof(struct ipv6hdr) - 4;
1159 t = netdev_priv(dev);
1160 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1161 dev->mtu -= 8;
1162 dev->flags |= IFF_NOARP;
c12b395a 1163 dev->addr_len = sizeof(struct in6_addr);
02875878 1164 netif_keep_dst(dev);
c12b395a 1165}
1166
a3c119d3 1167static int ip6gre_tunnel_init_common(struct net_device *dev)
c12b395a 1168{
1169 struct ip6_tnl *tunnel;
cdf3464e 1170 int ret;
c12b395a 1171
1172 tunnel = netdev_priv(dev);
1173
1174 tunnel->dev = dev;
0bd87628 1175 tunnel->net = dev_net(dev);
c12b395a 1176 strcpy(tunnel->parms.name, dev->name);
1177
a3c119d3
MKL		 1178 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1179 if (!dev->tstats)
1180 return -ENOMEM;
1181
607f725f 1182 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
cdf3464e
MKL		 1183 if (ret) {
1184 free_percpu(dev->tstats);
1185 dev->tstats = NULL;
1186 return ret;
1187 }
1188
a3c119d3
MKL		 1189 return 0;
1190}
1191
1192static int ip6gre_tunnel_init(struct net_device *dev)
1193{
1194 struct ip6_tnl *tunnel;
1195 int ret;
1196
1197 ret = ip6gre_tunnel_init_common(dev);
1198 if (ret)
1199 return ret;
1200
1201 tunnel = netdev_priv(dev);
1202
c12b395a 1203 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1204 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1205
1206 if (ipv6_addr_any(&tunnel->parms.raddr))
1207 dev->header_ops = &ip6gre_header_ops;
1208
c12b395a 1209 return 0;
1210}
1211
1212static void ip6gre_fb_tunnel_init(struct net_device *dev)
1213{
1214 struct ip6_tnl *tunnel = netdev_priv(dev);
1215
1216 tunnel->dev = dev;
0bd87628 1217 tunnel->net = dev_net(dev);
c12b395a 1218 strcpy(tunnel->parms.name, dev->name);
1219
1220 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1221
1222 dev_hold(dev);
1223}
1224
1225
1226static struct inet6_protocol ip6gre_protocol __read_mostly = {
308edfdf 1227 .handler = gre_rcv,
c12b395a 1228 .err_handler = ip6gre_err,
1229 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1230};
1231
22f08069 1232static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
c12b395a 1233{
22f08069
ND		 1234 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1235 struct net_device *dev, *aux;
c12b395a 1236 int prio;
1237
22f08069
ND		 1238 for_each_netdev_safe(net, dev, aux)
1239 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1240 dev->rtnl_link_ops == &ip6gre_tap_ops)
1241 unregister_netdevice_queue(dev, head);
1242
c12b395a 1243 for (prio = 0; prio < 4; prio++) {
1244 int h;
1245 for (h = 0; h < HASH_SIZE; h++) {
1246 struct ip6_tnl *t;
1247
1248 t = rtnl_dereference(ign->tunnels[prio][h]);
1249
53b24b8f 1250 while (t) {
22f08069
ND		 1251 /* If dev is in the same netns, it has already
1252 * been added to the list by the previous loop.
1253 */
1254 if (!net_eq(dev_net(t->dev), net))
1255 unregister_netdevice_queue(t->dev,
1256 head);
c12b395a 1257 t = rtnl_dereference(t->next);
1258 }
1259 }
1260 }
1261}
1262
1263static int __net_init ip6gre_init_net(struct net *net)
1264{
1265 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1266 int err;
1267
1268 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
c835a677
TG		 1269 NET_NAME_UNKNOWN,
1270 ip6gre_tunnel_setup);
c12b395a 1271 if (!ign->fb_tunnel_dev) {
1272 err = -ENOMEM;
1273 goto err_alloc_dev;
1274 }
1275 dev_net_set(ign->fb_tunnel_dev, net);
22f08069
ND		 1276 /* FB netdevice is special: we have one, and only one per netns.
1277 * Allowing to move it to another netns is clearly unsafe.
1278 */
1279 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1280
c12b395a 1281
1282 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1283 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1284
1285 err = register_netdev(ign->fb_tunnel_dev);
1286 if (err)
1287 goto err_reg_dev;
1288
1289 rcu_assign_pointer(ign->tunnels_wc[0],
1290 netdev_priv(ign->fb_tunnel_dev));
1291 return 0;
1292
1293err_reg_dev:
1294 ip6gre_dev_free(ign->fb_tunnel_dev);
1295err_alloc_dev:
1296 return err;
1297}
1298
1299static void __net_exit ip6gre_exit_net(struct net *net)
1300{
c12b395a 1301 LIST_HEAD(list);
1302
c12b395a 1303 rtnl_lock();
22f08069 1304 ip6gre_destroy_tunnels(net, &list);
c12b395a 1305 unregister_netdevice_many(&list);
1306 rtnl_unlock();
1307}
1308
1309static struct pernet_operations ip6gre_net_ops = {
1310 .init = ip6gre_init_net,
1311 .exit = ip6gre_exit_net,
1312 .id = &ip6gre_net_id,
1313 .size = sizeof(struct ip6gre_net),
1314};
1315
1316static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
1317{
1318 __be16 flags;
1319
1320 if (!data)
1321 return 0;
1322
1323 flags = 0;
1324 if (data[IFLA_GRE_IFLAGS])
1325 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1326 if (data[IFLA_GRE_OFLAGS])
1327 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1328 if (flags & (GRE_VERSION|GRE_ROUTING))
1329 return -EINVAL;
1330
1331 return 0;
1332}
1333
1334static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[])
1335{
1336 struct in6_addr daddr;
1337
1338 if (tb[IFLA_ADDRESS]) {
1339 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1340 return -EINVAL;
1341 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1342 return -EADDRNOTAVAIL;
1343 }
1344
1345 if (!data)
1346 goto out;
1347
1348 if (data[IFLA_GRE_REMOTE]) {
67b61f6c 1349 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
c12b395a 1350 if (ipv6_addr_any(&daddr))
1351 return -EINVAL;
1352 }
1353
1354out:
1355 return ip6gre_tunnel_validate(tb, data);
1356}
1357
1358
1359static void ip6gre_netlink_parms(struct nlattr *data[],
1360 struct __ip6_tnl_parm *parms)
1361{
1362 memset(parms, 0, sizeof(*parms));
1363
1364 if (!data)
1365 return;
1366
1367 if (data[IFLA_GRE_LINK])
1368 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1369
1370 if (data[IFLA_GRE_IFLAGS])
1371 parms->i_flags = nla_get_be16(data[IFLA_GRE_IFLAGS]);
1372
1373 if (data[IFLA_GRE_OFLAGS])
1374 parms->o_flags = nla_get_be16(data[IFLA_GRE_OFLAGS]);
1375
1376 if (data[IFLA_GRE_IKEY])
1377 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1378
1379 if (data[IFLA_GRE_OKEY])
1380 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1381
1382 if (data[IFLA_GRE_LOCAL])
67b61f6c 1383 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
c12b395a 1384
1385 if (data[IFLA_GRE_REMOTE])
67b61f6c 1386 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
c12b395a 1387
1388 if (data[IFLA_GRE_TTL])
1389 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1390
1391 if (data[IFLA_GRE_ENCAP_LIMIT])
1392 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1393
1394 if (data[IFLA_GRE_FLOWINFO])
1395 parms->flowinfo = nla_get_u32(data[IFLA_GRE_FLOWINFO]);
1396
1397 if (data[IFLA_GRE_FLAGS])
1398 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1399}
1400
1401static int ip6gre_tap_init(struct net_device *dev)
1402{
1403 struct ip6_tnl *tunnel;
a3c119d3 1404 int ret;
c12b395a 1405
a3c119d3
MKL		 1406 ret = ip6gre_tunnel_init_common(dev);
1407 if (ret)
1408 return ret;
c12b395a 1409
a3c119d3 1410 tunnel = netdev_priv(dev);
c12b395a 1411
1412 ip6gre_tnl_link_config(tunnel, 1);
1413
c12b395a 1414 return 0;
1415}
1416
1417static const struct net_device_ops ip6gre_tap_netdev_ops = {
1418 .ndo_init = ip6gre_tap_init,
1419 .ndo_uninit = ip6gre_tunnel_uninit,
1420 .ndo_start_xmit = ip6gre_tunnel_xmit,
1421 .ndo_set_mac_address = eth_mac_addr,
1422 .ndo_validate_addr = eth_validate_addr,
1423 .ndo_change_mtu = ip6gre_tunnel_change_mtu,
f61dd388 1424 .ndo_get_stats64 = ip_tunnel_get_stats64,
ecf2c06a 1425 .ndo_get_iflink = ip6_tnl_get_iflink,
c12b395a 1426};
1427
ac4eb009
AD		 1428#define GRE6_FEATURES (NETIF_F_SG | \
1429 NETIF_F_FRAGLIST | \
1430 NETIF_F_HIGHDMA | \
1431 NETIF_F_HW_CSUM)
1432
c12b395a 1433static void ip6gre_tap_setup(struct net_device *dev)
1434{
1435
1436 ether_setup(dev);
1437
1438 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1439 dev->destructor = ip6gre_dev_free;
1440
c12b395a 1441 dev->features |= NETIF_F_NETNS_LOCAL;
d13b161c 1442 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
c12b395a 1443}
1444
1445static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1446 struct nlattr *tb[], struct nlattr *data[])
1447{
1448 struct ip6_tnl *nt;
1449 struct net *net = dev_net(dev);
1450 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1451 int err;
1452
1453 nt = netdev_priv(dev);
1454 ip6gre_netlink_parms(data, &nt->parms);
1455
1456 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1457 return -EEXIST;
1458
1459 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1460 eth_hw_addr_random(dev);
1461
1462 nt->dev = dev;
0bd87628 1463 nt->net = dev_net(dev);
c12b395a 1464 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1465
ac4eb009
AD		 1466 dev->features |= GRE6_FEATURES;
1467 dev->hw_features |= GRE6_FEATURES;
1468
3a80e1fa
AD		 1469 if (!(nt->parms.o_flags & GRE_SEQ)) {
1470 /* TCP segmentation offload is not supported when we
1471 * generate output sequences.
1472 */
1473 dev->features |= NETIF_F_GSO_SOFTWARE;
1474 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1475
1476 /* Can use a lockless transmit, unless we generate
1477 * output sequences
1478 */
c12b395a 1479 dev->features |= NETIF_F_LLTX;
3a80e1fa 1480 }
c12b395a 1481
1482 err = register_netdevice(dev);
1483 if (err)
1484 goto out;
1485
1486 dev_hold(dev);
1487 ip6gre_tunnel_link(ign, nt);
1488
1489out:
1490 return err;
1491}
1492
1493static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
1494 struct nlattr *data[])
1495{
22f08069
ND		 1496 struct ip6_tnl *t, *nt = netdev_priv(dev);
1497 struct net *net = nt->net;
c12b395a 1498 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1499 struct __ip6_tnl_parm p;
1500
1501 if (dev == ign->fb_tunnel_dev)
1502 return -EINVAL;
1503
c12b395a 1504 ip6gre_netlink_parms(data, &p);
1505
1506 t = ip6gre_tunnel_locate(net, &p, 0);
1507
1508 if (t) {
1509 if (t->dev != dev)
1510 return -EEXIST;
1511 } else {
1512 t = nt;
c12b395a 1513 }
1514
6a61d4db
ND		 1515 ip6gre_tunnel_unlink(ign, t);
1516 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
1517 ip6gre_tunnel_link(ign, t);
c12b395a 1518 return 0;
1519}
1520
54d63f78
ND		 1521static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
1522{
1523 struct net *net = dev_net(dev);
1524 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1525
1526 if (dev != ign->fb_tunnel_dev)
1527 unregister_netdevice_queue(dev, head);
1528}
1529
c12b395a 1530static size_t ip6gre_get_size(const struct net_device *dev)
1531{
1532 return
1533 /* IFLA_GRE_LINK */
1534 nla_total_size(4) +
1535 /* IFLA_GRE_IFLAGS */
1536 nla_total_size(2) +
1537 /* IFLA_GRE_OFLAGS */
1538 nla_total_size(2) +
1539 /* IFLA_GRE_IKEY */
1540 nla_total_size(4) +
1541 /* IFLA_GRE_OKEY */
1542 nla_total_size(4) +
1543 /* IFLA_GRE_LOCAL */
a3754133 1544 nla_total_size(sizeof(struct in6_addr)) +
c12b395a 1545 /* IFLA_GRE_REMOTE */
a3754133 1546 nla_total_size(sizeof(struct in6_addr)) +
c12b395a 1547 /* IFLA_GRE_TTL */
1548 nla_total_size(1) +
1549 /* IFLA_GRE_TOS */
1550 nla_total_size(1) +
1551 /* IFLA_GRE_ENCAP_LIMIT */
1552 nla_total_size(1) +
1553 /* IFLA_GRE_FLOWINFO */
1554 nla_total_size(4) +
1555 /* IFLA_GRE_FLAGS */
1556 nla_total_size(4) +
1557 0;
1558}
1559
1560static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
1561{
1562 struct ip6_tnl *t = netdev_priv(dev);
1563 struct __ip6_tnl_parm *p = &t->parms;
1564
1565 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
1566 nla_put_be16(skb, IFLA_GRE_IFLAGS, p->i_flags) ||
1567 nla_put_be16(skb, IFLA_GRE_OFLAGS, p->o_flags) ||
1568 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
1569 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
930345ea
JB		 1570 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
1571 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
c12b395a 1572 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
1573 /*nla_put_u8(skb, IFLA_GRE_TOS, t->priority) ||*/
1574 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
1575 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
1576 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags))
1577 goto nla_put_failure;
1578 return 0;
1579
1580nla_put_failure:
1581 return -EMSGSIZE;
1582}
1583
1584static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
1585 [IFLA_GRE_LINK] = { .type = NLA_U32 },
1586 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
1587 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
1588 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
1589 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
1590 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
1591 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
1592 [IFLA_GRE_TTL] = { .type = NLA_U8 },
1593 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
1594 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
1595 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
1596};
1597
1598static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
1599 .kind = "ip6gre",
1600 .maxtype = IFLA_GRE_MAX,
1601 .policy = ip6gre_policy,
1602 .priv_size = sizeof(struct ip6_tnl),
1603 .setup = ip6gre_tunnel_setup,
1604 .validate = ip6gre_tunnel_validate,
1605 .newlink = ip6gre_newlink,
1606 .changelink = ip6gre_changelink,
54d63f78 1607 .dellink = ip6gre_dellink,
c12b395a 1608 .get_size = ip6gre_get_size,
1609 .fill_info = ip6gre_fill_info,
1728d4fa 1610 .get_link_net = ip6_tnl_get_link_net,
c12b395a 1611};
1612
1613static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
1614 .kind = "ip6gretap",
1615 .maxtype = IFLA_GRE_MAX,
1616 .policy = ip6gre_policy,
1617 .priv_size = sizeof(struct ip6_tnl),
1618 .setup = ip6gre_tap_setup,
1619 .validate = ip6gre_tap_validate,
1620 .newlink = ip6gre_newlink,
1621 .changelink = ip6gre_changelink,
1622 .get_size = ip6gre_get_size,
1623 .fill_info = ip6gre_fill_info,
3390e397 1624 .get_link_net = ip6_tnl_get_link_net,
c12b395a 1625};
1626
1627/*
1628 * And now the modules code and kernel interface.
1629 */
1630
1631static int __init ip6gre_init(void)
1632{
1633 int err;
1634
1635 pr_info("GRE over IPv6 tunneling driver\n");
1636
1637 err = register_pernet_device(&ip6gre_net_ops);
1638 if (err < 0)
1639 return err;
1640
1641 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
1642 if (err < 0) {
1643 pr_info("%s: can't add protocol\n", __func__);
1644 goto add_proto_failed;
1645 }
1646
1647 err = rtnl_link_register(&ip6gre_link_ops);
1648 if (err < 0)
1649 goto rtnl_link_failed;
1650
1651 err = rtnl_link_register(&ip6gre_tap_ops);
1652 if (err < 0)
1653 goto tap_ops_failed;
1654
1655out:
1656 return err;
1657
1658tap_ops_failed:
1659 rtnl_link_unregister(&ip6gre_link_ops);
1660rtnl_link_failed:
1661 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1662add_proto_failed:
1663 unregister_pernet_device(&ip6gre_net_ops);
1664 goto out;
1665}
1666
1667static void __exit ip6gre_fini(void)
1668{
1669 rtnl_link_unregister(&ip6gre_tap_ops);
1670 rtnl_link_unregister(&ip6gre_link_ops);
1671 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1672 unregister_pernet_device(&ip6gre_net_ops);
1673}
1674
1675module_init(ip6gre_init);
1676module_exit(ip6gre_fini);
1677MODULE_LICENSE("GPL");
1678MODULE_AUTHOR("D. Kozlov ([email protected])");
1679MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
1680MODULE_ALIAS_RTNL_LINK("ip6gre");
5a4ee9a9 1681MODULE_ALIAS_RTNL_LINK("ip6gretap");
c12b395a 1682MODULE_ALIAS_NETDEV("ip6gre0");
Empty description
This page took 0.551433 seconds and 4 git commands to generate.