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Linux 4.8.3
[linux/fpc-iii.git] / net / ipv6 / ip6_gre.c
blobedc3daab354ecf6c3b42cd1dfe7ad486d2bde0e4
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
652 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
653 if (err)
654 return err;
655
656 err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol);
657
658 return err;
659 }
660
661 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
662 struct net_device *dev)
663 {
664 struct ip6_tnl *t = netdev_priv(dev);
665 struct net_device_stats *stats = &t->dev->stats;
666 int ret;
667
668 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
669 goto tx_err;
670
671 switch (skb->protocol) {
672 case htons(ETH_P_IP):
673 ret = ip6gre_xmit_ipv4(skb, dev);
674 break;
675 case htons(ETH_P_IPV6):
676 ret = ip6gre_xmit_ipv6(skb, dev);
677 break;
678 default:
679 ret = ip6gre_xmit_other(skb, dev);
680 break;
681 }
682
683 if (ret < 0)
684 goto tx_err;
685
686 return NETDEV_TX_OK;
687
688 tx_err:
689 stats->tx_errors++;
690 stats->tx_dropped++;
691 kfree_skb(skb);
692 return NETDEV_TX_OK;
693 }
694
695 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
696 {
697 struct net_device *dev = t->dev;
698 struct __ip6_tnl_parm *p = &t->parms;
699 struct flowi6 *fl6 = &t->fl.u.ip6;
700 int t_hlen;
701
702 if (dev->type != ARPHRD_ETHER) {
703 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
704 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
705 }
706
707 /* Set up flowi template */
708 fl6->saddr = p->laddr;
709 fl6->daddr = p->raddr;
710 fl6->flowi6_oif = p->link;
711 fl6->flowlabel = 0;
712 fl6->flowi6_proto = IPPROTO_GRE;
713
714 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
715 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
716 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
717 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
718
719 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
720 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
721
722 if (p->flags&IP6_TNL_F_CAP_XMIT &&
723 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
724 dev->flags |= IFF_POINTOPOINT;
725 else
726 dev->flags &= ~IFF_POINTOPOINT;
727
728 t->tun_hlen = gre_calc_hlen(t->parms.o_flags);
729
730 t->hlen = t->encap_hlen + t->tun_hlen;
731
732 t_hlen = t->hlen + sizeof(struct ipv6hdr);
733
734 if (p->flags & IP6_TNL_F_CAP_XMIT) {
735 int strict = (ipv6_addr_type(&p->raddr) &
736 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
737
738 struct rt6_info *rt = rt6_lookup(t->net,
739 &p->raddr, &p->laddr,
740 p->link, strict);
741
742 if (!rt)
743 return;
744
745 if (rt->dst.dev) {
746 dev->hard_header_len = rt->dst.dev->hard_header_len +
747 t_hlen;
748
749 if (set_mtu) {
750 dev->mtu = rt->dst.dev->mtu - t_hlen;
751 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
752 dev->mtu -= 8;
753 if (dev->type == ARPHRD_ETHER)
754 dev->mtu -= ETH_HLEN;
755
756 if (dev->mtu < IPV6_MIN_MTU)
757 dev->mtu = IPV6_MIN_MTU;
758 }
759 }
760 ip6_rt_put(rt);
761 }
762 }
763
764 static int ip6gre_tnl_change(struct ip6_tnl *t,
765 const struct __ip6_tnl_parm *p, int set_mtu)
766 {
767 t->parms.laddr = p->laddr;
768 t->parms.raddr = p->raddr;
769 t->parms.flags = p->flags;
770 t->parms.hop_limit = p->hop_limit;
771 t->parms.encap_limit = p->encap_limit;
772 t->parms.flowinfo = p->flowinfo;
773 t->parms.link = p->link;
774 t->parms.proto = p->proto;
775 t->parms.i_key = p->i_key;
776 t->parms.o_key = p->o_key;
777 t->parms.i_flags = p->i_flags;
778 t->parms.o_flags = p->o_flags;
779 dst_cache_reset(&t->dst_cache);
780 ip6gre_tnl_link_config(t, set_mtu);
781 return 0;
782 }
783
784 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
785 const struct ip6_tnl_parm2 *u)
786 {
787 p->laddr = u->laddr;
788 p->raddr = u->raddr;
789 p->flags = u->flags;
790 p->hop_limit = u->hop_limit;
791 p->encap_limit = u->encap_limit;
792 p->flowinfo = u->flowinfo;
793 p->link = u->link;
794 p->i_key = u->i_key;
795 p->o_key = u->o_key;
796 p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
797 p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
798 memcpy(p->name, u->name, sizeof(u->name));
799 }
800
801 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
802 const struct __ip6_tnl_parm *p)
803 {
804 u->proto = IPPROTO_GRE;
805 u->laddr = p->laddr;
806 u->raddr = p->raddr;
807 u->flags = p->flags;
808 u->hop_limit = p->hop_limit;
809 u->encap_limit = p->encap_limit;
810 u->flowinfo = p->flowinfo;
811 u->link = p->link;
812 u->i_key = p->i_key;
813 u->o_key = p->o_key;
814 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
815 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
816 memcpy(u->name, p->name, sizeof(u->name));
817 }
818
819 static int ip6gre_tunnel_ioctl(struct net_device *dev,
820 struct ifreq *ifr, int cmd)
821 {
822 int err = 0;
823 struct ip6_tnl_parm2 p;
824 struct __ip6_tnl_parm p1;
825 struct ip6_tnl *t = netdev_priv(dev);
826 struct net *net = t->net;
827 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
828
829 memset(&p1, 0, sizeof(p1));
830
831 switch (cmd) {
832 case SIOCGETTUNNEL:
833 if (dev == ign->fb_tunnel_dev) {
834 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
835 err = -EFAULT;
836 break;
837 }
838 ip6gre_tnl_parm_from_user(&p1, &p);
839 t = ip6gre_tunnel_locate(net, &p1, 0);
840 if (!t)
841 t = netdev_priv(dev);
842 }
843 memset(&p, 0, sizeof(p));
844 ip6gre_tnl_parm_to_user(&p, &t->parms);
845 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
846 err = -EFAULT;
847 break;
848
849 case SIOCADDTUNNEL:
850 case SIOCCHGTUNNEL:
851 err = -EPERM;
852 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
853 goto done;
854
855 err = -EFAULT;
856 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
857 goto done;
858
859 err = -EINVAL;
860 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
861 goto done;
862
863 if (!(p.i_flags&GRE_KEY))
864 p.i_key = 0;
865 if (!(p.o_flags&GRE_KEY))
866 p.o_key = 0;
867
868 ip6gre_tnl_parm_from_user(&p1, &p);
869 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
870
871 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
872 if (t) {
873 if (t->dev != dev) {
874 err = -EEXIST;
875 break;
876 }
877 } else {
878 t = netdev_priv(dev);
879
880 ip6gre_tunnel_unlink(ign, t);
881 synchronize_net();
882 ip6gre_tnl_change(t, &p1, 1);
883 ip6gre_tunnel_link(ign, t);
884 netdev_state_change(dev);
885 }
886 }
887
888 if (t) {
889 err = 0;
890
891 memset(&p, 0, sizeof(p));
892 ip6gre_tnl_parm_to_user(&p, &t->parms);
893 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
894 err = -EFAULT;
895 } else
896 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
897 break;
898
899 case SIOCDELTUNNEL:
900 err = -EPERM;
901 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
902 goto done;
903
904 if (dev == ign->fb_tunnel_dev) {
905 err = -EFAULT;
906 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
907 goto done;
908 err = -ENOENT;
909 ip6gre_tnl_parm_from_user(&p1, &p);
910 t = ip6gre_tunnel_locate(net, &p1, 0);
911 if (!t)
912 goto done;
913 err = -EPERM;
914 if (t == netdev_priv(ign->fb_tunnel_dev))
915 goto done;
916 dev = t->dev;
917 }
918 unregister_netdevice(dev);
919 err = 0;
920 break;
921
922 default:
923 err = -EINVAL;
924 }
925
926 done:
927 return err;
928 }
929
930 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
931 unsigned short type,
932 const void *daddr, const void *saddr, unsigned int len)
933 {
934 struct ip6_tnl *t = netdev_priv(dev);
935 struct ipv6hdr *ipv6h = (struct ipv6hdr *)skb_push(skb, t->hlen);
936 __be16 *p = (__be16 *)(ipv6h+1);
937
938 ip6_flow_hdr(ipv6h, 0,
939 ip6_make_flowlabel(dev_net(dev), skb,
940 t->fl.u.ip6.flowlabel, true,
941 &t->fl.u.ip6));
942 ipv6h->hop_limit = t->parms.hop_limit;
943 ipv6h->nexthdr = NEXTHDR_GRE;
944 ipv6h->saddr = t->parms.laddr;
945 ipv6h->daddr = t->parms.raddr;
946
947 p[0] = t->parms.o_flags;
948 p[1] = htons(type);
949
950 /*
951 * Set the source hardware address.
952 */
953
954 if (saddr)
955 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
956 if (daddr)
957 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
958 if (!ipv6_addr_any(&ipv6h->daddr))
959 return t->hlen;
960
961 return -t->hlen;
962 }
963
964 static const struct header_ops ip6gre_header_ops = {
965 .create = ip6gre_header,
966 };
967
968 static const struct net_device_ops ip6gre_netdev_ops = {
969 .ndo_init = ip6gre_tunnel_init,
970 .ndo_uninit = ip6gre_tunnel_uninit,
971 .ndo_start_xmit = ip6gre_tunnel_xmit,
972 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
973 .ndo_change_mtu = ip6_tnl_change_mtu,
974 .ndo_get_stats64 = ip_tunnel_get_stats64,
975 .ndo_get_iflink = ip6_tnl_get_iflink,
976 };
977
978 static void ip6gre_dev_free(struct net_device *dev)
979 {
980 struct ip6_tnl *t = netdev_priv(dev);
981
982 dst_cache_destroy(&t->dst_cache);
983 free_percpu(dev->tstats);
984 free_netdev(dev);
985 }
986
987 static void ip6gre_tunnel_setup(struct net_device *dev)
988 {
989 dev->netdev_ops = &ip6gre_netdev_ops;
990 dev->destructor = ip6gre_dev_free;
991
992 dev->type = ARPHRD_IP6GRE;
993
994 dev->flags |= IFF_NOARP;
995 dev->addr_len = sizeof(struct in6_addr);
996 netif_keep_dst(dev);
997 }
998
999 static int ip6gre_tunnel_init_common(struct net_device *dev)
1000 {
1001 struct ip6_tnl *tunnel;
1002 int ret;
1003 int t_hlen;
1004
1005 tunnel = netdev_priv(dev);
1006
1007 tunnel->dev = dev;
1008 tunnel->net = dev_net(dev);
1009 strcpy(tunnel->parms.name, dev->name);
1010
1011 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1012 if (!dev->tstats)
1013 return -ENOMEM;
1014
1015 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1016 if (ret) {
1017 free_percpu(dev->tstats);
1018 dev->tstats = NULL;
1019 return ret;
1020 }
1021
1022 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1023 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1024 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1025
1026 dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1027 dev->mtu = ETH_DATA_LEN - t_hlen;
1028 if (dev->type == ARPHRD_ETHER)
1029 dev->mtu -= ETH_HLEN;
1030 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1031 dev->mtu -= 8;
1032
1033 return 0;
1034 }
1035
1036 static int ip6gre_tunnel_init(struct net_device *dev)
1037 {
1038 struct ip6_tnl *tunnel;
1039 int ret;
1040
1041 ret = ip6gre_tunnel_init_common(dev);
1042 if (ret)
1043 return ret;
1044
1045 tunnel = netdev_priv(dev);
1046
1047 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1048 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1049
1050 if (ipv6_addr_any(&tunnel->parms.raddr))
1051 dev->header_ops = &ip6gre_header_ops;
1052
1053 return 0;
1054 }
1055
1056 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1057 {
1058 struct ip6_tnl *tunnel = netdev_priv(dev);
1059
1060 tunnel->dev = dev;
1061 tunnel->net = dev_net(dev);
1062 strcpy(tunnel->parms.name, dev->name);
1063
1064 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1065
1066 dev_hold(dev);
1067 }
1068
1069
1070 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1071 .handler = gre_rcv,
1072 .err_handler = ip6gre_err,
1073 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1074 };
1075
1076 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1077 {
1078 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1079 struct net_device *dev, *aux;
1080 int prio;
1081
1082 for_each_netdev_safe(net, dev, aux)
1083 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1084 dev->rtnl_link_ops == &ip6gre_tap_ops)
1085 unregister_netdevice_queue(dev, head);
1086
1087 for (prio = 0; prio < 4; prio++) {
1088 int h;
1089 for (h = 0; h < HASH_SIZE; h++) {
1090 struct ip6_tnl *t;
1091
1092 t = rtnl_dereference(ign->tunnels[prio][h]);
1093
1094 while (t) {
1095 /* If dev is in the same netns, it has already
1096 * been added to the list by the previous loop.
1097 */
1098 if (!net_eq(dev_net(t->dev), net))
1099 unregister_netdevice_queue(t->dev,
1100 head);
1101 t = rtnl_dereference(t->next);
1102 }
1103 }
1104 }
1105 }
1106
1107 static int __net_init ip6gre_init_net(struct net *net)
1108 {
1109 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1110 int err;
1111
1112 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1113 NET_NAME_UNKNOWN,
1114 ip6gre_tunnel_setup);
1115 if (!ign->fb_tunnel_dev) {
1116 err = -ENOMEM;
1117 goto err_alloc_dev;
1118 }
1119 dev_net_set(ign->fb_tunnel_dev, net);
1120 /* FB netdevice is special: we have one, and only one per netns.
1121 * Allowing to move it to another netns is clearly unsafe.
1122 */
1123 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1124
1125
1126 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1127 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1128
1129 err = register_netdev(ign->fb_tunnel_dev);
1130 if (err)
1131 goto err_reg_dev;
1132
1133 rcu_assign_pointer(ign->tunnels_wc[0],
1134 netdev_priv(ign->fb_tunnel_dev));
1135 return 0;
1136
1137 err_reg_dev:
1138 ip6gre_dev_free(ign->fb_tunnel_dev);
1139 err_alloc_dev:
1140 return err;
1141 }
1142
1143 static void __net_exit ip6gre_exit_net(struct net *net)
1144 {
1145 LIST_HEAD(list);
1146
1147 rtnl_lock();
1148 ip6gre_destroy_tunnels(net, &list);
1149 unregister_netdevice_many(&list);
1150 rtnl_unlock();
1151 }
1152
1153 static struct pernet_operations ip6gre_net_ops = {
1154 .init = ip6gre_init_net,
1155 .exit = ip6gre_exit_net,
1156 .id = &ip6gre_net_id,
1157 .size = sizeof(struct ip6gre_net),
1158 };
1159
1160 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
1161 {
1162 __be16 flags;
1163
1164 if (!data)
1165 return 0;
1166
1167 flags = 0;
1168 if (data[IFLA_GRE_IFLAGS])
1169 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1170 if (data[IFLA_GRE_OFLAGS])
1171 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1172 if (flags & (GRE_VERSION|GRE_ROUTING))
1173 return -EINVAL;
1174
1175 return 0;
1176 }
1177
1178 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[])
1179 {
1180 struct in6_addr daddr;
1181
1182 if (tb[IFLA_ADDRESS]) {
1183 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1184 return -EINVAL;
1185 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1186 return -EADDRNOTAVAIL;
1187 }
1188
1189 if (!data)
1190 goto out;
1191
1192 if (data[IFLA_GRE_REMOTE]) {
1193 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1194 if (ipv6_addr_any(&daddr))
1195 return -EINVAL;
1196 }
1197
1198 out:
1199 return ip6gre_tunnel_validate(tb, data);
1200 }
1201
1202
1203 static void ip6gre_netlink_parms(struct nlattr *data[],
1204 struct __ip6_tnl_parm *parms)
1205 {
1206 memset(parms, 0, sizeof(*parms));
1207
1208 if (!data)
1209 return;
1210
1211 if (data[IFLA_GRE_LINK])
1212 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1213
1214 if (data[IFLA_GRE_IFLAGS])
1215 parms->i_flags = gre_flags_to_tnl_flags(
1216 nla_get_be16(data[IFLA_GRE_IFLAGS]));
1217
1218 if (data[IFLA_GRE_OFLAGS])
1219 parms->o_flags = gre_flags_to_tnl_flags(
1220 nla_get_be16(data[IFLA_GRE_OFLAGS]));
1221
1222 if (data[IFLA_GRE_IKEY])
1223 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1224
1225 if (data[IFLA_GRE_OKEY])
1226 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1227
1228 if (data[IFLA_GRE_LOCAL])
1229 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1230
1231 if (data[IFLA_GRE_REMOTE])
1232 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1233
1234 if (data[IFLA_GRE_TTL])
1235 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1236
1237 if (data[IFLA_GRE_ENCAP_LIMIT])
1238 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1239
1240 if (data[IFLA_GRE_FLOWINFO])
1241 parms->flowinfo = nla_get_u32(data[IFLA_GRE_FLOWINFO]);
1242
1243 if (data[IFLA_GRE_FLAGS])
1244 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1245 }
1246
1247 static int ip6gre_tap_init(struct net_device *dev)
1248 {
1249 struct ip6_tnl *tunnel;
1250 int ret;
1251
1252 ret = ip6gre_tunnel_init_common(dev);
1253 if (ret)
1254 return ret;
1255
1256 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1257
1258 tunnel = netdev_priv(dev);
1259
1260 ip6gre_tnl_link_config(tunnel, 1);
1261
1262 return 0;
1263 }
1264
1265 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1266 .ndo_init = ip6gre_tap_init,
1267 .ndo_uninit = ip6gre_tunnel_uninit,
1268 .ndo_start_xmit = ip6gre_tunnel_xmit,
1269 .ndo_set_mac_address = eth_mac_addr,
1270 .ndo_validate_addr = eth_validate_addr,
1271 .ndo_change_mtu = ip6_tnl_change_mtu,
1272 .ndo_get_stats64 = ip_tunnel_get_stats64,
1273 .ndo_get_iflink = ip6_tnl_get_iflink,
1274 };
1275
1276 #define GRE6_FEATURES (NETIF_F_SG | \
1277 NETIF_F_FRAGLIST | \
1278 NETIF_F_HIGHDMA | \
1279 NETIF_F_HW_CSUM)
1280
1281 static void ip6gre_tap_setup(struct net_device *dev)
1282 {
1283
1284 ether_setup(dev);
1285
1286 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1287 dev->destructor = ip6gre_dev_free;
1288
1289 dev->features |= NETIF_F_NETNS_LOCAL;
1290 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1291 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1292 }
1293
1294 static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1295 struct ip_tunnel_encap *ipencap)
1296 {
1297 bool ret = false;
1298
1299 memset(ipencap, 0, sizeof(*ipencap));
1300
1301 if (!data)
1302 return ret;
1303
1304 if (data[IFLA_GRE_ENCAP_TYPE]) {
1305 ret = true;
1306 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1307 }
1308
1309 if (data[IFLA_GRE_ENCAP_FLAGS]) {
1310 ret = true;
1311 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1312 }
1313
1314 if (data[IFLA_GRE_ENCAP_SPORT]) {
1315 ret = true;
1316 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1317 }
1318
1319 if (data[IFLA_GRE_ENCAP_DPORT]) {
1320 ret = true;
1321 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1322 }
1323
1324 return ret;
1325 }
1326
1327 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1328 struct nlattr *tb[], struct nlattr *data[])
1329 {
1330 struct ip6_tnl *nt;
1331 struct net *net = dev_net(dev);
1332 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1333 struct ip_tunnel_encap ipencap;
1334 int err;
1335
1336 nt = netdev_priv(dev);
1337
1338 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1339 int err = ip6_tnl_encap_setup(nt, &ipencap);
1340
1341 if (err < 0)
1342 return err;
1343 }
1344
1345 ip6gre_netlink_parms(data, &nt->parms);
1346
1347 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1348 return -EEXIST;
1349
1350 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1351 eth_hw_addr_random(dev);
1352
1353 nt->dev = dev;
1354 nt->net = dev_net(dev);
1355 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1356
1357 dev->features |= GRE6_FEATURES;
1358 dev->hw_features |= GRE6_FEATURES;
1359
1360 if (!(nt->parms.o_flags & TUNNEL_SEQ)) {
1361 /* TCP offload with GRE SEQ is not supported, nor
1362 * can we support 2 levels of outer headers requiring
1363 * an update.
1364 */
1365 if (!(nt->parms.o_flags & TUNNEL_CSUM) ||
1366 (nt->encap.type == TUNNEL_ENCAP_NONE)) {
1367 dev->features |= NETIF_F_GSO_SOFTWARE;
1368 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1369 }
1370
1371 /* Can use a lockless transmit, unless we generate
1372 * output sequences
1373 */
1374 dev->features |= NETIF_F_LLTX;
1375 }
1376
1377 err = register_netdevice(dev);
1378 if (err)
1379 goto out;
1380
1381 dev_hold(dev);
1382 ip6gre_tunnel_link(ign, nt);
1383
1384 out:
1385 return err;
1386 }
1387
1388 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
1389 struct nlattr *data[])
1390 {
1391 struct ip6_tnl *t, *nt = netdev_priv(dev);
1392 struct net *net = nt->net;
1393 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1394 struct __ip6_tnl_parm p;
1395 struct ip_tunnel_encap ipencap;
1396
1397 if (dev == ign->fb_tunnel_dev)
1398 return -EINVAL;
1399
1400 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1401 int err = ip6_tnl_encap_setup(nt, &ipencap);
1402
1403 if (err < 0)
1404 return err;
1405 }
1406
1407 ip6gre_netlink_parms(data, &p);
1408
1409 t = ip6gre_tunnel_locate(net, &p, 0);
1410
1411 if (t) {
1412 if (t->dev != dev)
1413 return -EEXIST;
1414 } else {
1415 t = nt;
1416 }
1417
1418 ip6gre_tunnel_unlink(ign, t);
1419 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
1420 ip6gre_tunnel_link(ign, t);
1421 return 0;
1422 }
1423
1424 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
1425 {
1426 struct net *net = dev_net(dev);
1427 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1428
1429 if (dev != ign->fb_tunnel_dev)
1430 unregister_netdevice_queue(dev, head);
1431 }
1432
1433 static size_t ip6gre_get_size(const struct net_device *dev)
1434 {
1435 return
1436 /* IFLA_GRE_LINK */
1437 nla_total_size(4) +
1438 /* IFLA_GRE_IFLAGS */
1439 nla_total_size(2) +
1440 /* IFLA_GRE_OFLAGS */
1441 nla_total_size(2) +
1442 /* IFLA_GRE_IKEY */
1443 nla_total_size(4) +
1444 /* IFLA_GRE_OKEY */
1445 nla_total_size(4) +
1446 /* IFLA_GRE_LOCAL */
1447 nla_total_size(sizeof(struct in6_addr)) +
1448 /* IFLA_GRE_REMOTE */
1449 nla_total_size(sizeof(struct in6_addr)) +
1450 /* IFLA_GRE_TTL */
1451 nla_total_size(1) +
1452 /* IFLA_GRE_ENCAP_LIMIT */
1453 nla_total_size(1) +
1454 /* IFLA_GRE_FLOWINFO */
1455 nla_total_size(4) +
1456 /* IFLA_GRE_FLAGS */
1457 nla_total_size(4) +
1458 /* IFLA_GRE_ENCAP_TYPE */
1459 nla_total_size(2) +
1460 /* IFLA_GRE_ENCAP_FLAGS */
1461 nla_total_size(2) +
1462 /* IFLA_GRE_ENCAP_SPORT */
1463 nla_total_size(2) +
1464 /* IFLA_GRE_ENCAP_DPORT */
1465 nla_total_size(2) +
1466 0;
1467 }
1468
1469 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
1470 {
1471 struct ip6_tnl *t = netdev_priv(dev);
1472 struct __ip6_tnl_parm *p = &t->parms;
1473
1474 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
1475 nla_put_be16(skb, IFLA_GRE_IFLAGS,
1476 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
1477 nla_put_be16(skb, IFLA_GRE_OFLAGS,
1478 gre_tnl_flags_to_gre_flags(p->o_flags)) ||
1479 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
1480 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
1481 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
1482 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
1483 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
1484 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
1485 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
1486 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags))
1487 goto nla_put_failure;
1488
1489 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
1490 t->encap.type) ||
1491 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
1492 t->encap.sport) ||
1493 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
1494 t->encap.dport) ||
1495 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
1496 t->encap.flags))
1497 goto nla_put_failure;
1498
1499 return 0;
1500
1501 nla_put_failure:
1502 return -EMSGSIZE;
1503 }
1504
1505 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
1506 [IFLA_GRE_LINK] = { .type = NLA_U32 },
1507 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
1508 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
1509 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
1510 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
1511 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
1512 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
1513 [IFLA_GRE_TTL] = { .type = NLA_U8 },
1514 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
1515 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
1516 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
1517 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 },
1518 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
1519 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
1520 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
1521 };
1522
1523 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
1524 .kind = "ip6gre",
1525 .maxtype = IFLA_GRE_MAX,
1526 .policy = ip6gre_policy,
1527 .priv_size = sizeof(struct ip6_tnl),
1528 .setup = ip6gre_tunnel_setup,
1529 .validate = ip6gre_tunnel_validate,
1530 .newlink = ip6gre_newlink,
1531 .changelink = ip6gre_changelink,
1532 .dellink = ip6gre_dellink,
1533 .get_size = ip6gre_get_size,
1534 .fill_info = ip6gre_fill_info,
1535 .get_link_net = ip6_tnl_get_link_net,
1536 };
1537
1538 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
1539 .kind = "ip6gretap",
1540 .maxtype = IFLA_GRE_MAX,
1541 .policy = ip6gre_policy,
1542 .priv_size = sizeof(struct ip6_tnl),
1543 .setup = ip6gre_tap_setup,
1544 .validate = ip6gre_tap_validate,
1545 .newlink = ip6gre_newlink,
1546 .changelink = ip6gre_changelink,
1547 .get_size = ip6gre_get_size,
1548 .fill_info = ip6gre_fill_info,
1549 .get_link_net = ip6_tnl_get_link_net,
1550 };
1551
1552 /*
1553 * And now the modules code and kernel interface.
1554 */
1555
1556 static int __init ip6gre_init(void)
1557 {
1558 int err;
1559
1560 pr_info("GRE over IPv6 tunneling driver\n");
1561
1562 err = register_pernet_device(&ip6gre_net_ops);
1563 if (err < 0)
1564 return err;
1565
1566 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
1567 if (err < 0) {
1568 pr_info("%s: can't add protocol\n", __func__);
1569 goto add_proto_failed;
1570 }
1571
1572 err = rtnl_link_register(&ip6gre_link_ops);
1573 if (err < 0)
1574 goto rtnl_link_failed;
1575
1576 err = rtnl_link_register(&ip6gre_tap_ops);
1577 if (err < 0)
1578 goto tap_ops_failed;
1579
1580 out:
1581 return err;
1582
1583 tap_ops_failed:
1584 rtnl_link_unregister(&ip6gre_link_ops);
1585 rtnl_link_failed:
1586 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1587 add_proto_failed:
1588 unregister_pernet_device(&ip6gre_net_ops);
1589 goto out;
1590 }
1591
1592 static void __exit ip6gre_fini(void)
1593 {
1594 rtnl_link_unregister(&ip6gre_tap_ops);
1595 rtnl_link_unregister(&ip6gre_link_ops);
1596 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1597 unregister_pernet_device(&ip6gre_net_ops);
1598 }
1599
1600 module_init(ip6gre_init);
1601 module_exit(ip6gre_fini);
1602 MODULE_LICENSE("GPL");
1603 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
1604 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
1605 MODULE_ALIAS_RTNL_LINK("ip6gre");
1606 MODULE_ALIAS_RTNL_LINK("ip6gretap");
1607 MODULE_ALIAS_NETDEV("ip6gre0");
Linux with added FPC-III support