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[deliverable/linux.git] / net / ipv6 / ip6_gre.c
1 /*
2 * GRE over IPv6 protocol decoder.
3 *
4 * Authors: Dmitry Kozlov (xeb@mail.ru)
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>
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>
40 #include <net/ip_tunnels.h>
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>
57 #include <net/gre.h>
58
59
60 static bool log_ecn_error = true;
61 module_param(log_ecn_error, bool, 0644);
62 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
63
64 #define HASH_SIZE_SHIFT 5
65 #define HASH_SIZE (1 << HASH_SIZE_SHIFT)
66
67 static int ip6gre_net_id __read_mostly;
68 struct ip6gre_net {
69 struct ip6_tnl __rcu *tunnels[4][HASH_SIZE];
70
71 struct net_device *fb_tunnel_dev;
72 };
73
74 static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
75 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly;
76 static int ip6gre_tunnel_init(struct net_device *dev);
77 static void ip6gre_tunnel_setup(struct net_device *dev);
78 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
79 static 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))
100 static 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]
111
112 /* Given src, dst and key, find appropriate for input tunnel. */
113
114 static 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
128 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
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
153 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
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
177 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
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
203 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
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
226 if (cand)
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
236 static 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
254 static 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
260 static 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
268 static 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
283 static 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
308 static 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);
317 if (t && create)
318 return NULL;
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
327 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
328 ip6gre_tunnel_setup);
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;
339 nt->net = dev_net(dev);
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 & TUNNEL_SEQ))
347 dev->features |= NETIF_F_LLTX;
348
349 dev_hold(dev);
350 ip6gre_tunnel_link(ign, nt);
351 return nt;
352
353 failed_free:
354 free_netdev(dev);
355 return NULL;
356 }
357
358 static void ip6gre_tunnel_uninit(struct net_device *dev)
359 {
360 struct ip6_tnl *t = netdev_priv(dev);
361 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
362
363 ip6gre_tunnel_unlink(ign, t);
364 dst_cache_reset(&t->dst_cache);
365 dev_put(dev);
366 }
367
368
369 static 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;
373 __be16 *p = (__be16 *)(skb->data + offset);
374 int grehlen = offset + 4;
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 */
390 if (!pskb_may_pull(skb, grehlen))
391 return;
392 ipv6h = (const struct ipv6hdr *)skb->data;
393 p = (__be16 *)(skb->data + offset);
394
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]);
399 if (!t)
400 return;
401
402 switch (type) {
403 __u32 teli;
404 struct ipv6_tlv_tnl_enc_lim *tel;
405 __u32 mtu;
406 case ICMPV6_DEST_UNREACH:
407 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
408 t->parms.name);
409 break;
410 case ICMPV6_TIME_EXCEED:
411 if (code == ICMPV6_EXC_HOPLIMIT) {
412 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
413 t->parms.name);
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
421 if (teli && teli == be32_to_cpu(info) - 2) {
422 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
423 if (tel->encap_limit == 0) {
424 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
425 t->parms.name);
426 }
427 } else {
428 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
429 t->parms.name);
430 }
431 break;
432 case ICMPV6_PKT_TOOBIG:
433 mtu = be32_to_cpu(info) - offset;
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;
445 }
446
447 static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
448 {
449 const struct ipv6hdr *ipv6h;
450 struct ip6_tnl *tunnel;
451
452 ipv6h = ipv6_hdr(skb);
453 tunnel = ip6gre_tunnel_lookup(skb->dev,
454 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
455 tpi->proto);
456 if (tunnel) {
457 ip6_tnl_rcv(tunnel, skb, tpi, NULL, false);
458
459 return PACKET_RCVD;
460 }
461
462 return PACKET_REJECT;
463 }
464
465 static int gre_rcv(struct sk_buff *skb)
466 {
467 struct tnl_ptk_info tpi;
468 bool csum_err = false;
469 int hdr_len;
470
471 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
472 if (hdr_len < 0)
473 goto drop;
474
475 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
476 goto drop;
477
478 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
479 return 0;
480
481 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
482 drop:
483 kfree_skb(skb);
484 return 0;
485 }
486
487 struct ipv6_tel_txoption {
488 struct ipv6_txoptions ops;
489 __u8 dst_opt[8];
490 };
491
492 static int gre_handle_offloads(struct sk_buff *skb, bool csum)
493 {
494 return iptunnel_handle_offloads(skb,
495 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
496 }
497
498 static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
499 struct net_device *dev, __u8 dsfield,
500 struct flowi6 *fl6, int encap_limit,
501 __u32 *pmtu, __be16 proto)
502 {
503 struct ip6_tnl *tunnel = netdev_priv(dev);
504 __be16 protocol = (dev->type == ARPHRD_ETHER) ?
505 htons(ETH_P_TEB) : proto;
506
507 if (dev->type == ARPHRD_ETHER)
508 IPCB(skb)->flags = 0;
509
510 if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
511 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
512 else
513 fl6->daddr = tunnel->parms.raddr;
514
515 if (tunnel->parms.o_flags & TUNNEL_SEQ)
516 tunnel->o_seqno++;
517
518 /* Push GRE header. */
519 gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags,
520 protocol, tunnel->parms.o_key, htonl(tunnel->o_seqno));
521
522 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
523 NEXTHDR_GRE);
524 }
525
526 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
527 {
528 struct ip6_tnl *t = netdev_priv(dev);
529 const struct iphdr *iph = ip_hdr(skb);
530 int encap_limit = -1;
531 struct flowi6 fl6;
532 __u8 dsfield;
533 __u32 mtu;
534 int err;
535
536 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
537
538 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
539 encap_limit = t->parms.encap_limit;
540
541 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
542
543 dsfield = ipv4_get_dsfield(iph);
544
545 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
546 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
547 & IPV6_TCLASS_MASK;
548 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
549 fl6.flowi6_mark = skb->mark;
550
551 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
552 if (err)
553 return -1;
554
555 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
556 skb->protocol);
557 if (err != 0) {
558 /* XXX: send ICMP error even if DF is not set. */
559 if (err == -EMSGSIZE)
560 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
561 htonl(mtu));
562 return -1;
563 }
564
565 return 0;
566 }
567
568 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
569 {
570 struct ip6_tnl *t = netdev_priv(dev);
571 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
572 int encap_limit = -1;
573 __u16 offset;
574 struct flowi6 fl6;
575 __u8 dsfield;
576 __u32 mtu;
577 int err;
578
579 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
580 return -1;
581
582 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
583 if (offset > 0) {
584 struct ipv6_tlv_tnl_enc_lim *tel;
585 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
586 if (tel->encap_limit == 0) {
587 icmpv6_send(skb, ICMPV6_PARAMPROB,
588 ICMPV6_HDR_FIELD, offset + 2);
589 return -1;
590 }
591 encap_limit = tel->encap_limit - 1;
592 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
593 encap_limit = t->parms.encap_limit;
594
595 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
596
597 dsfield = ipv6_get_dsfield(ipv6h);
598 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
599 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
600 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
601 fl6.flowlabel |= ip6_flowlabel(ipv6h);
602 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
603 fl6.flowi6_mark = skb->mark;
604
605 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
606 return -1;
607
608 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
609 &mtu, skb->protocol);
610 if (err != 0) {
611 if (err == -EMSGSIZE)
612 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
613 return -1;
614 }
615
616 return 0;
617 }
618
619 /**
620 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
621 * @t: the outgoing tunnel device
622 * @hdr: IPv6 header from the incoming packet
623 *
624 * Description:
625 * Avoid trivial tunneling loop by checking that tunnel exit-point
626 * doesn't match source of incoming packet.
627 *
628 * Return:
629 * 1 if conflict,
630 * 0 else
631 **/
632
633 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
634 const struct ipv6hdr *hdr)
635 {
636 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
637 }
638
639 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
640 {
641 struct ip6_tnl *t = netdev_priv(dev);
642 int encap_limit = -1;
643 struct flowi6 fl6;
644 __u32 mtu;
645 int err;
646
647 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
648 encap_limit = t->parms.encap_limit;
649
650 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
651 fl6.flowi6_proto = skb->protocol;
652
653 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
654 if (err)
655 return err;
656
657 err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol);
658
659 return err;
660 }
661
662 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
663 struct net_device *dev)
664 {
665 struct ip6_tnl *t = netdev_priv(dev);
666 struct net_device_stats *stats = &t->dev->stats;
667 int ret;
668
669 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
670 goto tx_err;
671
672 switch (skb->protocol) {
673 case htons(ETH_P_IP):
674 ret = ip6gre_xmit_ipv4(skb, dev);
675 break;
676 case htons(ETH_P_IPV6):
677 ret = ip6gre_xmit_ipv6(skb, dev);
678 break;
679 default:
680 ret = ip6gre_xmit_other(skb, dev);
681 break;
682 }
683
684 if (ret < 0)
685 goto tx_err;
686
687 return NETDEV_TX_OK;
688
689 tx_err:
690 stats->tx_errors++;
691 stats->tx_dropped++;
692 kfree_skb(skb);
693 return NETDEV_TX_OK;
694 }
695
696 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
697 {
698 struct net_device *dev = t->dev;
699 struct __ip6_tnl_parm *p = &t->parms;
700 struct flowi6 *fl6 = &t->fl.u.ip6;
701 int t_hlen;
702
703 if (dev->type != ARPHRD_ETHER) {
704 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
705 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
706 }
707
708 /* Set up flowi template */
709 fl6->saddr = p->laddr;
710 fl6->daddr = p->raddr;
711 fl6->flowi6_oif = p->link;
712 fl6->flowlabel = 0;
713 fl6->flowi6_proto = IPPROTO_GRE;
714
715 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
716 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
717 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
718 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
719
720 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
721 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
722
723 if (p->flags&IP6_TNL_F_CAP_XMIT &&
724 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
725 dev->flags |= IFF_POINTOPOINT;
726 else
727 dev->flags &= ~IFF_POINTOPOINT;
728
729 t->tun_hlen = gre_calc_hlen(t->parms.o_flags);
730
731 t->hlen = t->encap_hlen + t->tun_hlen;
732
733 t_hlen = t->hlen + sizeof(struct ipv6hdr);
734
735 if (p->flags & IP6_TNL_F_CAP_XMIT) {
736 int strict = (ipv6_addr_type(&p->raddr) &
737 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
738
739 struct rt6_info *rt = rt6_lookup(t->net,
740 &p->raddr, &p->laddr,
741 p->link, strict);
742
743 if (!rt)
744 return;
745
746 if (rt->dst.dev) {
747 dev->hard_header_len = rt->dst.dev->hard_header_len +
748 t_hlen;
749
750 if (set_mtu) {
751 dev->mtu = rt->dst.dev->mtu - t_hlen;
752 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
753 dev->mtu -= 8;
754 if (dev->type == ARPHRD_ETHER)
755 dev->mtu -= ETH_HLEN;
756
757 if (dev->mtu < IPV6_MIN_MTU)
758 dev->mtu = IPV6_MIN_MTU;
759 }
760 }
761 ip6_rt_put(rt);
762 }
763 }
764
765 static int ip6gre_tnl_change(struct ip6_tnl *t,
766 const struct __ip6_tnl_parm *p, int set_mtu)
767 {
768 t->parms.laddr = p->laddr;
769 t->parms.raddr = p->raddr;
770 t->parms.flags = p->flags;
771 t->parms.hop_limit = p->hop_limit;
772 t->parms.encap_limit = p->encap_limit;
773 t->parms.flowinfo = p->flowinfo;
774 t->parms.link = p->link;
775 t->parms.proto = p->proto;
776 t->parms.i_key = p->i_key;
777 t->parms.o_key = p->o_key;
778 t->parms.i_flags = p->i_flags;
779 t->parms.o_flags = p->o_flags;
780 dst_cache_reset(&t->dst_cache);
781 ip6gre_tnl_link_config(t, set_mtu);
782 return 0;
783 }
784
785 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
786 const struct ip6_tnl_parm2 *u)
787 {
788 p->laddr = u->laddr;
789 p->raddr = u->raddr;
790 p->flags = u->flags;
791 p->hop_limit = u->hop_limit;
792 p->encap_limit = u->encap_limit;
793 p->flowinfo = u->flowinfo;
794 p->link = u->link;
795 p->i_key = u->i_key;
796 p->o_key = u->o_key;
797 p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
798 p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
799 memcpy(p->name, u->name, sizeof(u->name));
800 }
801
802 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
803 const struct __ip6_tnl_parm *p)
804 {
805 u->proto = IPPROTO_GRE;
806 u->laddr = p->laddr;
807 u->raddr = p->raddr;
808 u->flags = p->flags;
809 u->hop_limit = p->hop_limit;
810 u->encap_limit = p->encap_limit;
811 u->flowinfo = p->flowinfo;
812 u->link = p->link;
813 u->i_key = p->i_key;
814 u->o_key = p->o_key;
815 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
816 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
817 memcpy(u->name, p->name, sizeof(u->name));
818 }
819
820 static int ip6gre_tunnel_ioctl(struct net_device *dev,
821 struct ifreq *ifr, int cmd)
822 {
823 int err = 0;
824 struct ip6_tnl_parm2 p;
825 struct __ip6_tnl_parm p1;
826 struct ip6_tnl *t = netdev_priv(dev);
827 struct net *net = t->net;
828 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
829
830 memset(&p1, 0, sizeof(p1));
831
832 switch (cmd) {
833 case SIOCGETTUNNEL:
834 if (dev == ign->fb_tunnel_dev) {
835 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
836 err = -EFAULT;
837 break;
838 }
839 ip6gre_tnl_parm_from_user(&p1, &p);
840 t = ip6gre_tunnel_locate(net, &p1, 0);
841 if (!t)
842 t = netdev_priv(dev);
843 }
844 memset(&p, 0, sizeof(p));
845 ip6gre_tnl_parm_to_user(&p, &t->parms);
846 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
847 err = -EFAULT;
848 break;
849
850 case SIOCADDTUNNEL:
851 case SIOCCHGTUNNEL:
852 err = -EPERM;
853 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
854 goto done;
855
856 err = -EFAULT;
857 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
858 goto done;
859
860 err = -EINVAL;
861 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
862 goto done;
863
864 if (!(p.i_flags&GRE_KEY))
865 p.i_key = 0;
866 if (!(p.o_flags&GRE_KEY))
867 p.o_key = 0;
868
869 ip6gre_tnl_parm_from_user(&p1, &p);
870 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
871
872 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
873 if (t) {
874 if (t->dev != dev) {
875 err = -EEXIST;
876 break;
877 }
878 } else {
879 t = netdev_priv(dev);
880
881 ip6gre_tunnel_unlink(ign, t);
882 synchronize_net();
883 ip6gre_tnl_change(t, &p1, 1);
884 ip6gre_tunnel_link(ign, t);
885 netdev_state_change(dev);
886 }
887 }
888
889 if (t) {
890 err = 0;
891
892 memset(&p, 0, sizeof(p));
893 ip6gre_tnl_parm_to_user(&p, &t->parms);
894 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
895 err = -EFAULT;
896 } else
897 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
898 break;
899
900 case SIOCDELTUNNEL:
901 err = -EPERM;
902 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
903 goto done;
904
905 if (dev == ign->fb_tunnel_dev) {
906 err = -EFAULT;
907 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
908 goto done;
909 err = -ENOENT;
910 ip6gre_tnl_parm_from_user(&p1, &p);
911 t = ip6gre_tunnel_locate(net, &p1, 0);
912 if (!t)
913 goto done;
914 err = -EPERM;
915 if (t == netdev_priv(ign->fb_tunnel_dev))
916 goto done;
917 dev = t->dev;
918 }
919 unregister_netdevice(dev);
920 err = 0;
921 break;
922
923 default:
924 err = -EINVAL;
925 }
926
927 done:
928 return err;
929 }
930
931 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
932 unsigned short type,
933 const void *daddr, const void *saddr, unsigned int len)
934 {
935 struct ip6_tnl *t = netdev_priv(dev);
936 struct ipv6hdr *ipv6h = (struct ipv6hdr *)skb_push(skb, t->hlen);
937 __be16 *p = (__be16 *)(ipv6h+1);
938
939 ip6_flow_hdr(ipv6h, 0,
940 ip6_make_flowlabel(dev_net(dev), skb,
941 t->fl.u.ip6.flowlabel, true,
942 &t->fl.u.ip6));
943 ipv6h->hop_limit = t->parms.hop_limit;
944 ipv6h->nexthdr = NEXTHDR_GRE;
945 ipv6h->saddr = t->parms.laddr;
946 ipv6h->daddr = t->parms.raddr;
947
948 p[0] = t->parms.o_flags;
949 p[1] = htons(type);
950
951 /*
952 * Set the source hardware address.
953 */
954
955 if (saddr)
956 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
957 if (daddr)
958 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
959 if (!ipv6_addr_any(&ipv6h->daddr))
960 return t->hlen;
961
962 return -t->hlen;
963 }
964
965 static const struct header_ops ip6gre_header_ops = {
966 .create = ip6gre_header,
967 };
968
969 static const struct net_device_ops ip6gre_netdev_ops = {
970 .ndo_init = ip6gre_tunnel_init,
971 .ndo_uninit = ip6gre_tunnel_uninit,
972 .ndo_start_xmit = ip6gre_tunnel_xmit,
973 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
974 .ndo_change_mtu = ip6_tnl_change_mtu,
975 .ndo_get_stats64 = ip_tunnel_get_stats64,
976 .ndo_get_iflink = ip6_tnl_get_iflink,
977 };
978
979 static void ip6gre_dev_free(struct net_device *dev)
980 {
981 struct ip6_tnl *t = netdev_priv(dev);
982
983 dst_cache_destroy(&t->dst_cache);
984 free_percpu(dev->tstats);
985 free_netdev(dev);
986 }
987
988 static void ip6gre_tunnel_setup(struct net_device *dev)
989 {
990 dev->netdev_ops = &ip6gre_netdev_ops;
991 dev->destructor = ip6gre_dev_free;
992
993 dev->type = ARPHRD_IP6GRE;
994
995 dev->flags |= IFF_NOARP;
996 dev->addr_len = sizeof(struct in6_addr);
997 netif_keep_dst(dev);
998 }
999
1000 static int ip6gre_tunnel_init_common(struct net_device *dev)
1001 {
1002 struct ip6_tnl *tunnel;
1003 int ret;
1004 int t_hlen;
1005
1006 tunnel = netdev_priv(dev);
1007
1008 tunnel->dev = dev;
1009 tunnel->net = dev_net(dev);
1010 strcpy(tunnel->parms.name, dev->name);
1011
1012 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1013 if (!dev->tstats)
1014 return -ENOMEM;
1015
1016 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1017 if (ret) {
1018 free_percpu(dev->tstats);
1019 dev->tstats = NULL;
1020 return ret;
1021 }
1022
1023 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1024 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1025 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1026
1027 dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1028 dev->mtu = ETH_DATA_LEN - t_hlen;
1029 if (dev->type == ARPHRD_ETHER)
1030 dev->mtu -= ETH_HLEN;
1031 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1032 dev->mtu -= 8;
1033
1034 return 0;
1035 }
1036
1037 static int ip6gre_tunnel_init(struct net_device *dev)
1038 {
1039 struct ip6_tnl *tunnel;
1040 int ret;
1041
1042 ret = ip6gre_tunnel_init_common(dev);
1043 if (ret)
1044 return ret;
1045
1046 tunnel = netdev_priv(dev);
1047
1048 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1049 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1050
1051 if (ipv6_addr_any(&tunnel->parms.raddr))
1052 dev->header_ops = &ip6gre_header_ops;
1053
1054 return 0;
1055 }
1056
1057 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1058 {
1059 struct ip6_tnl *tunnel = netdev_priv(dev);
1060
1061 tunnel->dev = dev;
1062 tunnel->net = dev_net(dev);
1063 strcpy(tunnel->parms.name, dev->name);
1064
1065 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1066
1067 dev_hold(dev);
1068 }
1069
1070
1071 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1072 .handler = gre_rcv,
1073 .err_handler = ip6gre_err,
1074 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1075 };
1076
1077 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1078 {
1079 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1080 struct net_device *dev, *aux;
1081 int prio;
1082
1083 for_each_netdev_safe(net, dev, aux)
1084 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1085 dev->rtnl_link_ops == &ip6gre_tap_ops)
1086 unregister_netdevice_queue(dev, head);
1087
1088 for (prio = 0; prio < 4; prio++) {
1089 int h;
1090 for (h = 0; h < HASH_SIZE; h++) {
1091 struct ip6_tnl *t;
1092
1093 t = rtnl_dereference(ign->tunnels[prio][h]);
1094
1095 while (t) {
1096 /* If dev is in the same netns, it has already
1097 * been added to the list by the previous loop.
1098 */
1099 if (!net_eq(dev_net(t->dev), net))
1100 unregister_netdevice_queue(t->dev,
1101 head);
1102 t = rtnl_dereference(t->next);
1103 }
1104 }
1105 }
1106 }
1107
1108 static int __net_init ip6gre_init_net(struct net *net)
1109 {
1110 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1111 int err;
1112
1113 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1114 NET_NAME_UNKNOWN,
1115 ip6gre_tunnel_setup);
1116 if (!ign->fb_tunnel_dev) {
1117 err = -ENOMEM;
1118 goto err_alloc_dev;
1119 }
1120 dev_net_set(ign->fb_tunnel_dev, net);
1121 /* FB netdevice is special: we have one, and only one per netns.
1122 * Allowing to move it to another netns is clearly unsafe.
1123 */
1124 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1125
1126
1127 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1128 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1129
1130 err = register_netdev(ign->fb_tunnel_dev);
1131 if (err)
1132 goto err_reg_dev;
1133
1134 rcu_assign_pointer(ign->tunnels_wc[0],
1135 netdev_priv(ign->fb_tunnel_dev));
1136 return 0;
1137
1138 err_reg_dev:
1139 ip6gre_dev_free(ign->fb_tunnel_dev);
1140 err_alloc_dev:
1141 return err;
1142 }
1143
1144 static void __net_exit ip6gre_exit_net(struct net *net)
1145 {
1146 LIST_HEAD(list);
1147
1148 rtnl_lock();
1149 ip6gre_destroy_tunnels(net, &list);
1150 unregister_netdevice_many(&list);
1151 rtnl_unlock();
1152 }
1153
1154 static struct pernet_operations ip6gre_net_ops = {
1155 .init = ip6gre_init_net,
1156 .exit = ip6gre_exit_net,
1157 .id = &ip6gre_net_id,
1158 .size = sizeof(struct ip6gre_net),
1159 };
1160
1161 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
1162 {
1163 __be16 flags;
1164
1165 if (!data)
1166 return 0;
1167
1168 flags = 0;
1169 if (data[IFLA_GRE_IFLAGS])
1170 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1171 if (data[IFLA_GRE_OFLAGS])
1172 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1173 if (flags & (GRE_VERSION|GRE_ROUTING))
1174 return -EINVAL;
1175
1176 return 0;
1177 }
1178
1179 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[])
1180 {
1181 struct in6_addr daddr;
1182
1183 if (tb[IFLA_ADDRESS]) {
1184 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1185 return -EINVAL;
1186 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1187 return -EADDRNOTAVAIL;
1188 }
1189
1190 if (!data)
1191 goto out;
1192
1193 if (data[IFLA_GRE_REMOTE]) {
1194 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1195 if (ipv6_addr_any(&daddr))
1196 return -EINVAL;
1197 }
1198
1199 out:
1200 return ip6gre_tunnel_validate(tb, data);
1201 }
1202
1203
1204 static void ip6gre_netlink_parms(struct nlattr *data[],
1205 struct __ip6_tnl_parm *parms)
1206 {
1207 memset(parms, 0, sizeof(*parms));
1208
1209 if (!data)
1210 return;
1211
1212 if (data[IFLA_GRE_LINK])
1213 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1214
1215 if (data[IFLA_GRE_IFLAGS])
1216 parms->i_flags = gre_flags_to_tnl_flags(
1217 nla_get_be16(data[IFLA_GRE_IFLAGS]));
1218
1219 if (data[IFLA_GRE_OFLAGS])
1220 parms->o_flags = gre_flags_to_tnl_flags(
1221 nla_get_be16(data[IFLA_GRE_OFLAGS]));
1222
1223 if (data[IFLA_GRE_IKEY])
1224 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1225
1226 if (data[IFLA_GRE_OKEY])
1227 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1228
1229 if (data[IFLA_GRE_LOCAL])
1230 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1231
1232 if (data[IFLA_GRE_REMOTE])
1233 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1234
1235 if (data[IFLA_GRE_TTL])
1236 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1237
1238 if (data[IFLA_GRE_ENCAP_LIMIT])
1239 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1240
1241 if (data[IFLA_GRE_FLOWINFO])
1242 parms->flowinfo = nla_get_u32(data[IFLA_GRE_FLOWINFO]);
1243
1244 if (data[IFLA_GRE_FLAGS])
1245 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1246 }
1247
1248 static int ip6gre_tap_init(struct net_device *dev)
1249 {
1250 struct ip6_tnl *tunnel;
1251 int ret;
1252
1253 ret = ip6gre_tunnel_init_common(dev);
1254 if (ret)
1255 return ret;
1256
1257 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1258
1259 tunnel = netdev_priv(dev);
1260
1261 ip6gre_tnl_link_config(tunnel, 1);
1262
1263 return 0;
1264 }
1265
1266 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1267 .ndo_init = ip6gre_tap_init,
1268 .ndo_uninit = ip6gre_tunnel_uninit,
1269 .ndo_start_xmit = ip6gre_tunnel_xmit,
1270 .ndo_set_mac_address = eth_mac_addr,
1271 .ndo_validate_addr = eth_validate_addr,
1272 .ndo_change_mtu = ip6_tnl_change_mtu,
1273 .ndo_get_stats64 = ip_tunnel_get_stats64,
1274 .ndo_get_iflink = ip6_tnl_get_iflink,
1275 };
1276
1277 #define GRE6_FEATURES (NETIF_F_SG | \
1278 NETIF_F_FRAGLIST | \
1279 NETIF_F_HIGHDMA | \
1280 NETIF_F_HW_CSUM)
1281
1282 static void ip6gre_tap_setup(struct net_device *dev)
1283 {
1284
1285 ether_setup(dev);
1286
1287 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1288 dev->destructor = ip6gre_dev_free;
1289
1290 dev->features |= NETIF_F_NETNS_LOCAL;
1291 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1292 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1293 }
1294
1295 static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1296 struct ip_tunnel_encap *ipencap)
1297 {
1298 bool ret = false;
1299
1300 memset(ipencap, 0, sizeof(*ipencap));
1301
1302 if (!data)
1303 return ret;
1304
1305 if (data[IFLA_GRE_ENCAP_TYPE]) {
1306 ret = true;
1307 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1308 }
1309
1310 if (data[IFLA_GRE_ENCAP_FLAGS]) {
1311 ret = true;
1312 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1313 }
1314
1315 if (data[IFLA_GRE_ENCAP_SPORT]) {
1316 ret = true;
1317 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1318 }
1319
1320 if (data[IFLA_GRE_ENCAP_DPORT]) {
1321 ret = true;
1322 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1323 }
1324
1325 return ret;
1326 }
1327
1328 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1329 struct nlattr *tb[], struct nlattr *data[])
1330 {
1331 struct ip6_tnl *nt;
1332 struct net *net = dev_net(dev);
1333 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1334 struct ip_tunnel_encap ipencap;
1335 int err;
1336
1337 nt = netdev_priv(dev);
1338
1339 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1340 int err = ip6_tnl_encap_setup(nt, &ipencap);
1341
1342 if (err < 0)
1343 return err;
1344 }
1345
1346 ip6gre_netlink_parms(data, &nt->parms);
1347
1348 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1349 return -EEXIST;
1350
1351 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1352 eth_hw_addr_random(dev);
1353
1354 nt->dev = dev;
1355 nt->net = dev_net(dev);
1356 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1357
1358 dev->features |= GRE6_FEATURES;
1359 dev->hw_features |= GRE6_FEATURES;
1360
1361 if (!(nt->parms.o_flags & TUNNEL_SEQ)) {
1362 /* TCP offload with GRE SEQ is not supported, nor
1363 * can we support 2 levels of outer headers requiring
1364 * an update.
1365 */
1366 if (!(nt->parms.o_flags & TUNNEL_CSUM) ||
1367 (nt->encap.type == TUNNEL_ENCAP_NONE)) {
1368 dev->features |= NETIF_F_GSO_SOFTWARE;
1369 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1370 }
1371
1372 /* Can use a lockless transmit, unless we generate
1373 * output sequences
1374 */
1375 dev->features |= NETIF_F_LLTX;
1376 }
1377
1378 err = register_netdevice(dev);
1379 if (err)
1380 goto out;
1381
1382 dev_hold(dev);
1383 ip6gre_tunnel_link(ign, nt);
1384
1385 out:
1386 return err;
1387 }
1388
1389 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
1390 struct nlattr *data[])
1391 {
1392 struct ip6_tnl *t, *nt = netdev_priv(dev);
1393 struct net *net = nt->net;
1394 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1395 struct __ip6_tnl_parm p;
1396 struct ip_tunnel_encap ipencap;
1397
1398 if (dev == ign->fb_tunnel_dev)
1399 return -EINVAL;
1400
1401 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1402 int err = ip6_tnl_encap_setup(nt, &ipencap);
1403
1404 if (err < 0)
1405 return err;
1406 }
1407
1408 ip6gre_netlink_parms(data, &p);
1409
1410 t = ip6gre_tunnel_locate(net, &p, 0);
1411
1412 if (t) {
1413 if (t->dev != dev)
1414 return -EEXIST;
1415 } else {
1416 t = nt;
1417 }
1418
1419 ip6gre_tunnel_unlink(ign, t);
1420 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
1421 ip6gre_tunnel_link(ign, t);
1422 return 0;
1423 }
1424
1425 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
1426 {
1427 struct net *net = dev_net(dev);
1428 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1429
1430 if (dev != ign->fb_tunnel_dev)
1431 unregister_netdevice_queue(dev, head);
1432 }
1433
1434 static size_t ip6gre_get_size(const struct net_device *dev)
1435 {
1436 return
1437 /* IFLA_GRE_LINK */
1438 nla_total_size(4) +
1439 /* IFLA_GRE_IFLAGS */
1440 nla_total_size(2) +
1441 /* IFLA_GRE_OFLAGS */
1442 nla_total_size(2) +
1443 /* IFLA_GRE_IKEY */
1444 nla_total_size(4) +
1445 /* IFLA_GRE_OKEY */
1446 nla_total_size(4) +
1447 /* IFLA_GRE_LOCAL */
1448 nla_total_size(sizeof(struct in6_addr)) +
1449 /* IFLA_GRE_REMOTE */
1450 nla_total_size(sizeof(struct in6_addr)) +
1451 /* IFLA_GRE_TTL */
1452 nla_total_size(1) +
1453 /* IFLA_GRE_ENCAP_LIMIT */
1454 nla_total_size(1) +
1455 /* IFLA_GRE_FLOWINFO */
1456 nla_total_size(4) +
1457 /* IFLA_GRE_FLAGS */
1458 nla_total_size(4) +
1459 /* IFLA_GRE_ENCAP_TYPE */
1460 nla_total_size(2) +
1461 /* IFLA_GRE_ENCAP_FLAGS */
1462 nla_total_size(2) +
1463 /* IFLA_GRE_ENCAP_SPORT */
1464 nla_total_size(2) +
1465 /* IFLA_GRE_ENCAP_DPORT */
1466 nla_total_size(2) +
1467 0;
1468 }
1469
1470 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
1471 {
1472 struct ip6_tnl *t = netdev_priv(dev);
1473 struct __ip6_tnl_parm *p = &t->parms;
1474
1475 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
1476 nla_put_be16(skb, IFLA_GRE_IFLAGS,
1477 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
1478 nla_put_be16(skb, IFLA_GRE_OFLAGS,
1479 gre_tnl_flags_to_gre_flags(p->o_flags)) ||
1480 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
1481 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
1482 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
1483 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
1484 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
1485 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
1486 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
1487 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags))
1488 goto nla_put_failure;
1489
1490 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
1491 t->encap.type) ||
1492 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
1493 t->encap.sport) ||
1494 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
1495 t->encap.dport) ||
1496 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
1497 t->encap.flags))
1498 goto nla_put_failure;
1499
1500 return 0;
1501
1502 nla_put_failure:
1503 return -EMSGSIZE;
1504 }
1505
1506 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
1507 [IFLA_GRE_LINK] = { .type = NLA_U32 },
1508 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
1509 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
1510 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
1511 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
1512 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
1513 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
1514 [IFLA_GRE_TTL] = { .type = NLA_U8 },
1515 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
1516 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
1517 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
1518 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 },
1519 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
1520 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
1521 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
1522 };
1523
1524 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
1525 .kind = "ip6gre",
1526 .maxtype = IFLA_GRE_MAX,
1527 .policy = ip6gre_policy,
1528 .priv_size = sizeof(struct ip6_tnl),
1529 .setup = ip6gre_tunnel_setup,
1530 .validate = ip6gre_tunnel_validate,
1531 .newlink = ip6gre_newlink,
1532 .changelink = ip6gre_changelink,
1533 .dellink = ip6gre_dellink,
1534 .get_size = ip6gre_get_size,
1535 .fill_info = ip6gre_fill_info,
1536 .get_link_net = ip6_tnl_get_link_net,
1537 };
1538
1539 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
1540 .kind = "ip6gretap",
1541 .maxtype = IFLA_GRE_MAX,
1542 .policy = ip6gre_policy,
1543 .priv_size = sizeof(struct ip6_tnl),
1544 .setup = ip6gre_tap_setup,
1545 .validate = ip6gre_tap_validate,
1546 .newlink = ip6gre_newlink,
1547 .changelink = ip6gre_changelink,
1548 .get_size = ip6gre_get_size,
1549 .fill_info = ip6gre_fill_info,
1550 .get_link_net = ip6_tnl_get_link_net,
1551 };
1552
1553 /*
1554 * And now the modules code and kernel interface.
1555 */
1556
1557 static int __init ip6gre_init(void)
1558 {
1559 int err;
1560
1561 pr_info("GRE over IPv6 tunneling driver\n");
1562
1563 err = register_pernet_device(&ip6gre_net_ops);
1564 if (err < 0)
1565 return err;
1566
1567 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
1568 if (err < 0) {
1569 pr_info("%s: can't add protocol\n", __func__);
1570 goto add_proto_failed;
1571 }
1572
1573 err = rtnl_link_register(&ip6gre_link_ops);
1574 if (err < 0)
1575 goto rtnl_link_failed;
1576
1577 err = rtnl_link_register(&ip6gre_tap_ops);
1578 if (err < 0)
1579 goto tap_ops_failed;
1580
1581 out:
1582 return err;
1583
1584 tap_ops_failed:
1585 rtnl_link_unregister(&ip6gre_link_ops);
1586 rtnl_link_failed:
1587 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1588 add_proto_failed:
1589 unregister_pernet_device(&ip6gre_net_ops);
1590 goto out;
1591 }
1592
1593 static void __exit ip6gre_fini(void)
1594 {
1595 rtnl_link_unregister(&ip6gre_tap_ops);
1596 rtnl_link_unregister(&ip6gre_link_ops);
1597 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1598 unregister_pernet_device(&ip6gre_net_ops);
1599 }
1600
1601 module_init(ip6gre_init);
1602 module_exit(ip6gre_fini);
1603 MODULE_LICENSE("GPL");
1604 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
1605 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
1606 MODULE_ALIAS_RTNL_LINK("ip6gre");
1607 MODULE_ALIAS_RTNL_LINK("ip6gretap");
1608 MODULE_ALIAS_NETDEV("ip6gre0");
Linux kernel - Deliverables
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