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[mirror_ubuntu-artful-kernel.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 IP6_GRE_HASH_SIZE_SHIFT 5
65 #define IP6_GRE_HASH_SIZE (1 << IP6_GRE_HASH_SIZE_SHIFT)
66
67 static unsigned int ip6gre_net_id __read_mostly;
68 struct ip6gre_net {
69 struct ip6_tnl __rcu *tunnels[4][IP6_GRE_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))&(IP6_GRE_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, IP6_GRE_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 gre_base_hdr *greh;
373 const struct ipv6hdr *ipv6h;
374 int grehlen = sizeof(*greh);
375 struct ip6_tnl *t;
376 int key_off = 0;
377 __be16 flags;
378 __be32 key;
379
380 if (!pskb_may_pull(skb, offset + grehlen))
381 return;
382 greh = (const struct gre_base_hdr *)(skb->data + offset);
383 flags = greh->flags;
384 if (flags & (GRE_VERSION | GRE_ROUTING))
385 return;
386 if (flags & GRE_CSUM)
387 grehlen += 4;
388 if (flags & GRE_KEY) {
389 key_off = grehlen + offset;
390 grehlen += 4;
391 }
392
393 if (!pskb_may_pull(skb, offset + grehlen))
394 return;
395 ipv6h = (const struct ipv6hdr *)skb->data;
396 greh = (const struct gre_base_hdr *)(skb->data + offset);
397 key = key_off ? *(__be32 *)(skb->data + key_off) : 0;
398
399 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
400 key, greh->protocol);
401 if (!t)
402 return;
403
404 switch (type) {
405 __u32 teli;
406 struct ipv6_tlv_tnl_enc_lim *tel;
407 __u32 mtu;
408 case ICMPV6_DEST_UNREACH:
409 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
410 t->parms.name);
411 break;
412 case ICMPV6_TIME_EXCEED:
413 if (code == ICMPV6_EXC_HOPLIMIT) {
414 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
415 t->parms.name);
416 }
417 break;
418 case ICMPV6_PARAMPROB:
419 teli = 0;
420 if (code == ICMPV6_HDR_FIELD)
421 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
422
423 if (teli && teli == be32_to_cpu(info) - 2) {
424 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
425 if (tel->encap_limit == 0) {
426 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
427 t->parms.name);
428 }
429 } else {
430 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
431 t->parms.name);
432 }
433 break;
434 case ICMPV6_PKT_TOOBIG:
435 mtu = be32_to_cpu(info) - offset - t->tun_hlen;
436 if (t->dev->type == ARPHRD_ETHER)
437 mtu -= ETH_HLEN;
438 if (mtu < IPV6_MIN_MTU)
439 mtu = IPV6_MIN_MTU;
440 t->dev->mtu = mtu;
441 break;
442 }
443
444 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
445 t->err_count++;
446 else
447 t->err_count = 1;
448 t->err_time = jiffies;
449 }
450
451 static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
452 {
453 const struct ipv6hdr *ipv6h;
454 struct ip6_tnl *tunnel;
455
456 ipv6h = ipv6_hdr(skb);
457 tunnel = ip6gre_tunnel_lookup(skb->dev,
458 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
459 tpi->proto);
460 if (tunnel) {
461 ip6_tnl_rcv(tunnel, skb, tpi, NULL, false);
462
463 return PACKET_RCVD;
464 }
465
466 return PACKET_REJECT;
467 }
468
469 static int gre_rcv(struct sk_buff *skb)
470 {
471 struct tnl_ptk_info tpi;
472 bool csum_err = false;
473 int hdr_len;
474
475 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
476 if (hdr_len < 0)
477 goto drop;
478
479 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
480 goto drop;
481
482 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
483 return 0;
484
485 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
486 drop:
487 kfree_skb(skb);
488 return 0;
489 }
490
491 static int gre_handle_offloads(struct sk_buff *skb, bool csum)
492 {
493 return iptunnel_handle_offloads(skb,
494 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
495 }
496
497 static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
498 struct net_device *dev, __u8 dsfield,
499 struct flowi6 *fl6, int encap_limit,
500 __u32 *pmtu, __be16 proto)
501 {
502 struct ip6_tnl *tunnel = netdev_priv(dev);
503 __be16 protocol = (dev->type == ARPHRD_ETHER) ?
504 htons(ETH_P_TEB) : proto;
505
506 if (dev->type == ARPHRD_ETHER)
507 IPCB(skb)->flags = 0;
508
509 if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
510 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
511 else
512 fl6->daddr = tunnel->parms.raddr;
513
514 if (tunnel->parms.o_flags & TUNNEL_SEQ)
515 tunnel->o_seqno++;
516
517 /* Push GRE header. */
518 gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags,
519 protocol, tunnel->parms.o_key, htonl(tunnel->o_seqno));
520
521 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
522 NEXTHDR_GRE);
523 }
524
525 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
526 {
527 struct ip6_tnl *t = netdev_priv(dev);
528 const struct iphdr *iph = ip_hdr(skb);
529 int encap_limit = -1;
530 struct flowi6 fl6;
531 __u8 dsfield;
532 __u32 mtu;
533 int err;
534
535 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
536
537 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
538 encap_limit = t->parms.encap_limit;
539
540 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
541
542 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
543 dsfield = ipv4_get_dsfield(iph);
544 else
545 dsfield = ip6_tclass(t->parms.flowinfo);
546 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
547 fl6.flowi6_mark = skb->mark;
548 else
549 fl6.flowi6_mark = t->parms.fwmark;
550
551 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
552
553 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
554 if (err)
555 return -1;
556
557 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
558 skb->protocol);
559 if (err != 0) {
560 /* XXX: send ICMP error even if DF is not set. */
561 if (err == -EMSGSIZE)
562 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
563 htonl(mtu));
564 return -1;
565 }
566
567 return 0;
568 }
569
570 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
571 {
572 struct ip6_tnl *t = netdev_priv(dev);
573 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
574 int encap_limit = -1;
575 __u16 offset;
576 struct flowi6 fl6;
577 __u8 dsfield;
578 __u32 mtu;
579 int err;
580
581 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
582 return -1;
583
584 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
585 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
586 ipv6h = ipv6_hdr(skb);
587
588 if (offset > 0) {
589 struct ipv6_tlv_tnl_enc_lim *tel;
590 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
591 if (tel->encap_limit == 0) {
592 icmpv6_send(skb, ICMPV6_PARAMPROB,
593 ICMPV6_HDR_FIELD, offset + 2);
594 return -1;
595 }
596 encap_limit = tel->encap_limit - 1;
597 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
598 encap_limit = t->parms.encap_limit;
599
600 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
601
602 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
603 dsfield = ipv6_get_dsfield(ipv6h);
604 else
605 dsfield = ip6_tclass(t->parms.flowinfo);
606
607 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
608 fl6.flowlabel |= ip6_flowlabel(ipv6h);
609 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
610 fl6.flowi6_mark = skb->mark;
611 else
612 fl6.flowi6_mark = t->parms.fwmark;
613
614 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
615
616 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
617 return -1;
618
619 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
620 &mtu, skb->protocol);
621 if (err != 0) {
622 if (err == -EMSGSIZE)
623 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
624 return -1;
625 }
626
627 return 0;
628 }
629
630 /**
631 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
632 * @t: the outgoing tunnel device
633 * @hdr: IPv6 header from the incoming packet
634 *
635 * Description:
636 * Avoid trivial tunneling loop by checking that tunnel exit-point
637 * doesn't match source of incoming packet.
638 *
639 * Return:
640 * 1 if conflict,
641 * 0 else
642 **/
643
644 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
645 const struct ipv6hdr *hdr)
646 {
647 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
648 }
649
650 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
651 {
652 struct ip6_tnl *t = netdev_priv(dev);
653 int encap_limit = -1;
654 struct flowi6 fl6;
655 __u32 mtu;
656 int err;
657
658 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
659 encap_limit = t->parms.encap_limit;
660
661 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
662
663 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
664 if (err)
665 return err;
666
667 err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol);
668
669 return err;
670 }
671
672 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
673 struct net_device *dev)
674 {
675 struct ip6_tnl *t = netdev_priv(dev);
676 struct net_device_stats *stats = &t->dev->stats;
677 int ret;
678
679 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
680 goto tx_err;
681
682 switch (skb->protocol) {
683 case htons(ETH_P_IP):
684 ret = ip6gre_xmit_ipv4(skb, dev);
685 break;
686 case htons(ETH_P_IPV6):
687 ret = ip6gre_xmit_ipv6(skb, dev);
688 break;
689 default:
690 ret = ip6gre_xmit_other(skb, dev);
691 break;
692 }
693
694 if (ret < 0)
695 goto tx_err;
696
697 return NETDEV_TX_OK;
698
699 tx_err:
700 stats->tx_errors++;
701 stats->tx_dropped++;
702 kfree_skb(skb);
703 return NETDEV_TX_OK;
704 }
705
706 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
707 {
708 struct net_device *dev = t->dev;
709 struct __ip6_tnl_parm *p = &t->parms;
710 struct flowi6 *fl6 = &t->fl.u.ip6;
711 int t_hlen;
712
713 if (dev->type != ARPHRD_ETHER) {
714 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
715 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
716 }
717
718 /* Set up flowi template */
719 fl6->saddr = p->laddr;
720 fl6->daddr = p->raddr;
721 fl6->flowi6_oif = p->link;
722 fl6->flowlabel = 0;
723 fl6->flowi6_proto = IPPROTO_GRE;
724
725 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
726 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
727 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
728 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
729
730 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
731 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
732
733 if (p->flags&IP6_TNL_F_CAP_XMIT &&
734 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
735 dev->flags |= IFF_POINTOPOINT;
736 else
737 dev->flags &= ~IFF_POINTOPOINT;
738
739 t->tun_hlen = gre_calc_hlen(t->parms.o_flags);
740
741 t->hlen = t->encap_hlen + t->tun_hlen;
742
743 t_hlen = t->hlen + sizeof(struct ipv6hdr);
744
745 if (p->flags & IP6_TNL_F_CAP_XMIT) {
746 int strict = (ipv6_addr_type(&p->raddr) &
747 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
748
749 struct rt6_info *rt = rt6_lookup(t->net,
750 &p->raddr, &p->laddr,
751 p->link, strict);
752
753 if (!rt)
754 return;
755
756 if (rt->dst.dev) {
757 dev->hard_header_len = rt->dst.dev->hard_header_len +
758 t_hlen;
759
760 if (set_mtu) {
761 dev->mtu = rt->dst.dev->mtu - t_hlen;
762 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
763 dev->mtu -= 8;
764 if (dev->type == ARPHRD_ETHER)
765 dev->mtu -= ETH_HLEN;
766
767 if (dev->mtu < IPV6_MIN_MTU)
768 dev->mtu = IPV6_MIN_MTU;
769 }
770 }
771 ip6_rt_put(rt);
772 }
773 }
774
775 static int ip6gre_tnl_change(struct ip6_tnl *t,
776 const struct __ip6_tnl_parm *p, int set_mtu)
777 {
778 t->parms.laddr = p->laddr;
779 t->parms.raddr = p->raddr;
780 t->parms.flags = p->flags;
781 t->parms.hop_limit = p->hop_limit;
782 t->parms.encap_limit = p->encap_limit;
783 t->parms.flowinfo = p->flowinfo;
784 t->parms.link = p->link;
785 t->parms.proto = p->proto;
786 t->parms.i_key = p->i_key;
787 t->parms.o_key = p->o_key;
788 t->parms.i_flags = p->i_flags;
789 t->parms.o_flags = p->o_flags;
790 t->parms.fwmark = p->fwmark;
791 dst_cache_reset(&t->dst_cache);
792 ip6gre_tnl_link_config(t, set_mtu);
793 return 0;
794 }
795
796 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
797 const struct ip6_tnl_parm2 *u)
798 {
799 p->laddr = u->laddr;
800 p->raddr = u->raddr;
801 p->flags = u->flags;
802 p->hop_limit = u->hop_limit;
803 p->encap_limit = u->encap_limit;
804 p->flowinfo = u->flowinfo;
805 p->link = u->link;
806 p->i_key = u->i_key;
807 p->o_key = u->o_key;
808 p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
809 p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
810 memcpy(p->name, u->name, sizeof(u->name));
811 }
812
813 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
814 const struct __ip6_tnl_parm *p)
815 {
816 u->proto = IPPROTO_GRE;
817 u->laddr = p->laddr;
818 u->raddr = p->raddr;
819 u->flags = p->flags;
820 u->hop_limit = p->hop_limit;
821 u->encap_limit = p->encap_limit;
822 u->flowinfo = p->flowinfo;
823 u->link = p->link;
824 u->i_key = p->i_key;
825 u->o_key = p->o_key;
826 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
827 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
828 memcpy(u->name, p->name, sizeof(u->name));
829 }
830
831 static int ip6gre_tunnel_ioctl(struct net_device *dev,
832 struct ifreq *ifr, int cmd)
833 {
834 int err = 0;
835 struct ip6_tnl_parm2 p;
836 struct __ip6_tnl_parm p1;
837 struct ip6_tnl *t = netdev_priv(dev);
838 struct net *net = t->net;
839 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
840
841 memset(&p1, 0, sizeof(p1));
842
843 switch (cmd) {
844 case SIOCGETTUNNEL:
845 if (dev == ign->fb_tunnel_dev) {
846 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
847 err = -EFAULT;
848 break;
849 }
850 ip6gre_tnl_parm_from_user(&p1, &p);
851 t = ip6gre_tunnel_locate(net, &p1, 0);
852 if (!t)
853 t = netdev_priv(dev);
854 }
855 memset(&p, 0, sizeof(p));
856 ip6gre_tnl_parm_to_user(&p, &t->parms);
857 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
858 err = -EFAULT;
859 break;
860
861 case SIOCADDTUNNEL:
862 case SIOCCHGTUNNEL:
863 err = -EPERM;
864 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
865 goto done;
866
867 err = -EFAULT;
868 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
869 goto done;
870
871 err = -EINVAL;
872 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
873 goto done;
874
875 if (!(p.i_flags&GRE_KEY))
876 p.i_key = 0;
877 if (!(p.o_flags&GRE_KEY))
878 p.o_key = 0;
879
880 ip6gre_tnl_parm_from_user(&p1, &p);
881 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
882
883 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
884 if (t) {
885 if (t->dev != dev) {
886 err = -EEXIST;
887 break;
888 }
889 } else {
890 t = netdev_priv(dev);
891
892 ip6gre_tunnel_unlink(ign, t);
893 synchronize_net();
894 ip6gre_tnl_change(t, &p1, 1);
895 ip6gre_tunnel_link(ign, t);
896 netdev_state_change(dev);
897 }
898 }
899
900 if (t) {
901 err = 0;
902
903 memset(&p, 0, sizeof(p));
904 ip6gre_tnl_parm_to_user(&p, &t->parms);
905 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
906 err = -EFAULT;
907 } else
908 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
909 break;
910
911 case SIOCDELTUNNEL:
912 err = -EPERM;
913 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
914 goto done;
915
916 if (dev == ign->fb_tunnel_dev) {
917 err = -EFAULT;
918 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
919 goto done;
920 err = -ENOENT;
921 ip6gre_tnl_parm_from_user(&p1, &p);
922 t = ip6gre_tunnel_locate(net, &p1, 0);
923 if (!t)
924 goto done;
925 err = -EPERM;
926 if (t == netdev_priv(ign->fb_tunnel_dev))
927 goto done;
928 dev = t->dev;
929 }
930 unregister_netdevice(dev);
931 err = 0;
932 break;
933
934 default:
935 err = -EINVAL;
936 }
937
938 done:
939 return err;
940 }
941
942 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
943 unsigned short type, const void *daddr,
944 const void *saddr, unsigned int len)
945 {
946 struct ip6_tnl *t = netdev_priv(dev);
947 struct ipv6hdr *ipv6h;
948 __be16 *p;
949
950 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
951 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
952 t->fl.u.ip6.flowlabel,
953 true, &t->fl.u.ip6));
954 ipv6h->hop_limit = t->parms.hop_limit;
955 ipv6h->nexthdr = NEXTHDR_GRE;
956 ipv6h->saddr = t->parms.laddr;
957 ipv6h->daddr = t->parms.raddr;
958
959 p = (__be16 *)(ipv6h + 1);
960 p[0] = t->parms.o_flags;
961 p[1] = htons(type);
962
963 /*
964 * Set the source hardware address.
965 */
966
967 if (saddr)
968 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
969 if (daddr)
970 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
971 if (!ipv6_addr_any(&ipv6h->daddr))
972 return t->hlen;
973
974 return -t->hlen;
975 }
976
977 static const struct header_ops ip6gre_header_ops = {
978 .create = ip6gre_header,
979 };
980
981 static const struct net_device_ops ip6gre_netdev_ops = {
982 .ndo_init = ip6gre_tunnel_init,
983 .ndo_uninit = ip6gre_tunnel_uninit,
984 .ndo_start_xmit = ip6gre_tunnel_xmit,
985 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
986 .ndo_change_mtu = ip6_tnl_change_mtu,
987 .ndo_get_stats64 = ip_tunnel_get_stats64,
988 .ndo_get_iflink = ip6_tnl_get_iflink,
989 };
990
991 static void ip6gre_dev_free(struct net_device *dev)
992 {
993 struct ip6_tnl *t = netdev_priv(dev);
994
995 dst_cache_destroy(&t->dst_cache);
996 free_percpu(dev->tstats);
997 }
998
999 static void ip6gre_tunnel_setup(struct net_device *dev)
1000 {
1001 dev->netdev_ops = &ip6gre_netdev_ops;
1002 dev->needs_free_netdev = true;
1003 dev->priv_destructor = ip6gre_dev_free;
1004
1005 dev->type = ARPHRD_IP6GRE;
1006
1007 dev->flags |= IFF_NOARP;
1008 dev->addr_len = sizeof(struct in6_addr);
1009 netif_keep_dst(dev);
1010 /* This perm addr will be used as interface identifier by IPv6 */
1011 dev->addr_assign_type = NET_ADDR_RANDOM;
1012 eth_random_addr(dev->perm_addr);
1013 }
1014
1015 static int ip6gre_tunnel_init_common(struct net_device *dev)
1016 {
1017 struct ip6_tnl *tunnel;
1018 int ret;
1019 int t_hlen;
1020
1021 tunnel = netdev_priv(dev);
1022
1023 tunnel->dev = dev;
1024 tunnel->net = dev_net(dev);
1025 strcpy(tunnel->parms.name, dev->name);
1026
1027 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1028 if (!dev->tstats)
1029 return -ENOMEM;
1030
1031 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1032 if (ret) {
1033 free_percpu(dev->tstats);
1034 dev->tstats = NULL;
1035 return ret;
1036 }
1037
1038 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1039 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1040 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1041
1042 dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1043 dev->mtu = ETH_DATA_LEN - t_hlen;
1044 if (dev->type == ARPHRD_ETHER)
1045 dev->mtu -= ETH_HLEN;
1046 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1047 dev->mtu -= 8;
1048
1049 return 0;
1050 }
1051
1052 static int ip6gre_tunnel_init(struct net_device *dev)
1053 {
1054 struct ip6_tnl *tunnel;
1055 int ret;
1056
1057 ret = ip6gre_tunnel_init_common(dev);
1058 if (ret)
1059 return ret;
1060
1061 tunnel = netdev_priv(dev);
1062
1063 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1064 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1065
1066 if (ipv6_addr_any(&tunnel->parms.raddr))
1067 dev->header_ops = &ip6gre_header_ops;
1068
1069 return 0;
1070 }
1071
1072 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1073 {
1074 struct ip6_tnl *tunnel = netdev_priv(dev);
1075
1076 tunnel->dev = dev;
1077 tunnel->net = dev_net(dev);
1078 strcpy(tunnel->parms.name, dev->name);
1079
1080 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1081
1082 dev_hold(dev);
1083 }
1084
1085
1086 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1087 .handler = gre_rcv,
1088 .err_handler = ip6gre_err,
1089 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1090 };
1091
1092 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1093 {
1094 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1095 struct net_device *dev, *aux;
1096 int prio;
1097
1098 for_each_netdev_safe(net, dev, aux)
1099 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1100 dev->rtnl_link_ops == &ip6gre_tap_ops)
1101 unregister_netdevice_queue(dev, head);
1102
1103 for (prio = 0; prio < 4; prio++) {
1104 int h;
1105 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1106 struct ip6_tnl *t;
1107
1108 t = rtnl_dereference(ign->tunnels[prio][h]);
1109
1110 while (t) {
1111 /* If dev is in the same netns, it has already
1112 * been added to the list by the previous loop.
1113 */
1114 if (!net_eq(dev_net(t->dev), net))
1115 unregister_netdevice_queue(t->dev,
1116 head);
1117 t = rtnl_dereference(t->next);
1118 }
1119 }
1120 }
1121 }
1122
1123 static int __net_init ip6gre_init_net(struct net *net)
1124 {
1125 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1126 int err;
1127
1128 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1129 NET_NAME_UNKNOWN,
1130 ip6gre_tunnel_setup);
1131 if (!ign->fb_tunnel_dev) {
1132 err = -ENOMEM;
1133 goto err_alloc_dev;
1134 }
1135 dev_net_set(ign->fb_tunnel_dev, net);
1136 /* FB netdevice is special: we have one, and only one per netns.
1137 * Allowing to move it to another netns is clearly unsafe.
1138 */
1139 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1140
1141
1142 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1143 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1144
1145 err = register_netdev(ign->fb_tunnel_dev);
1146 if (err)
1147 goto err_reg_dev;
1148
1149 rcu_assign_pointer(ign->tunnels_wc[0],
1150 netdev_priv(ign->fb_tunnel_dev));
1151 return 0;
1152
1153 err_reg_dev:
1154 free_netdev(ign->fb_tunnel_dev);
1155 err_alloc_dev:
1156 return err;
1157 }
1158
1159 static void __net_exit ip6gre_exit_net(struct net *net)
1160 {
1161 LIST_HEAD(list);
1162
1163 rtnl_lock();
1164 ip6gre_destroy_tunnels(net, &list);
1165 unregister_netdevice_many(&list);
1166 rtnl_unlock();
1167 }
1168
1169 static struct pernet_operations ip6gre_net_ops = {
1170 .init = ip6gre_init_net,
1171 .exit = ip6gre_exit_net,
1172 .id = &ip6gre_net_id,
1173 .size = sizeof(struct ip6gre_net),
1174 };
1175
1176 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1177 struct netlink_ext_ack *extack)
1178 {
1179 __be16 flags;
1180
1181 if (!data)
1182 return 0;
1183
1184 flags = 0;
1185 if (data[IFLA_GRE_IFLAGS])
1186 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1187 if (data[IFLA_GRE_OFLAGS])
1188 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1189 if (flags & (GRE_VERSION|GRE_ROUTING))
1190 return -EINVAL;
1191
1192 return 0;
1193 }
1194
1195 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1196 struct netlink_ext_ack *extack)
1197 {
1198 struct in6_addr daddr;
1199
1200 if (tb[IFLA_ADDRESS]) {
1201 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1202 return -EINVAL;
1203 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1204 return -EADDRNOTAVAIL;
1205 }
1206
1207 if (!data)
1208 goto out;
1209
1210 if (data[IFLA_GRE_REMOTE]) {
1211 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1212 if (ipv6_addr_any(&daddr))
1213 return -EINVAL;
1214 }
1215
1216 out:
1217 return ip6gre_tunnel_validate(tb, data, extack);
1218 }
1219
1220
1221 static void ip6gre_netlink_parms(struct nlattr *data[],
1222 struct __ip6_tnl_parm *parms)
1223 {
1224 memset(parms, 0, sizeof(*parms));
1225
1226 if (!data)
1227 return;
1228
1229 if (data[IFLA_GRE_LINK])
1230 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1231
1232 if (data[IFLA_GRE_IFLAGS])
1233 parms->i_flags = gre_flags_to_tnl_flags(
1234 nla_get_be16(data[IFLA_GRE_IFLAGS]));
1235
1236 if (data[IFLA_GRE_OFLAGS])
1237 parms->o_flags = gre_flags_to_tnl_flags(
1238 nla_get_be16(data[IFLA_GRE_OFLAGS]));
1239
1240 if (data[IFLA_GRE_IKEY])
1241 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1242
1243 if (data[IFLA_GRE_OKEY])
1244 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1245
1246 if (data[IFLA_GRE_LOCAL])
1247 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1248
1249 if (data[IFLA_GRE_REMOTE])
1250 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1251
1252 if (data[IFLA_GRE_TTL])
1253 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1254
1255 if (data[IFLA_GRE_ENCAP_LIMIT])
1256 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1257
1258 if (data[IFLA_GRE_FLOWINFO])
1259 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1260
1261 if (data[IFLA_GRE_FLAGS])
1262 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1263
1264 if (data[IFLA_GRE_FWMARK])
1265 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1266 }
1267
1268 static int ip6gre_tap_init(struct net_device *dev)
1269 {
1270 struct ip6_tnl *tunnel;
1271 int ret;
1272
1273 ret = ip6gre_tunnel_init_common(dev);
1274 if (ret)
1275 return ret;
1276
1277 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1278
1279 tunnel = netdev_priv(dev);
1280
1281 ip6gre_tnl_link_config(tunnel, 1);
1282
1283 return 0;
1284 }
1285
1286 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1287 .ndo_init = ip6gre_tap_init,
1288 .ndo_uninit = ip6gre_tunnel_uninit,
1289 .ndo_start_xmit = ip6gre_tunnel_xmit,
1290 .ndo_set_mac_address = eth_mac_addr,
1291 .ndo_validate_addr = eth_validate_addr,
1292 .ndo_change_mtu = ip6_tnl_change_mtu,
1293 .ndo_get_stats64 = ip_tunnel_get_stats64,
1294 .ndo_get_iflink = ip6_tnl_get_iflink,
1295 };
1296
1297 #define GRE6_FEATURES (NETIF_F_SG | \
1298 NETIF_F_FRAGLIST | \
1299 NETIF_F_HIGHDMA | \
1300 NETIF_F_HW_CSUM)
1301
1302 static void ip6gre_tap_setup(struct net_device *dev)
1303 {
1304
1305 ether_setup(dev);
1306
1307 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1308 dev->needs_free_netdev = true;
1309 dev->priv_destructor = ip6gre_dev_free;
1310
1311 dev->features |= NETIF_F_NETNS_LOCAL;
1312 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1313 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1314 }
1315
1316 static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1317 struct ip_tunnel_encap *ipencap)
1318 {
1319 bool ret = false;
1320
1321 memset(ipencap, 0, sizeof(*ipencap));
1322
1323 if (!data)
1324 return ret;
1325
1326 if (data[IFLA_GRE_ENCAP_TYPE]) {
1327 ret = true;
1328 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1329 }
1330
1331 if (data[IFLA_GRE_ENCAP_FLAGS]) {
1332 ret = true;
1333 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1334 }
1335
1336 if (data[IFLA_GRE_ENCAP_SPORT]) {
1337 ret = true;
1338 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1339 }
1340
1341 if (data[IFLA_GRE_ENCAP_DPORT]) {
1342 ret = true;
1343 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1344 }
1345
1346 return ret;
1347 }
1348
1349 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1350 struct nlattr *tb[], struct nlattr *data[],
1351 struct netlink_ext_ack *extack)
1352 {
1353 struct ip6_tnl *nt;
1354 struct net *net = dev_net(dev);
1355 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1356 struct ip_tunnel_encap ipencap;
1357 int err;
1358
1359 nt = netdev_priv(dev);
1360
1361 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1362 int err = ip6_tnl_encap_setup(nt, &ipencap);
1363
1364 if (err < 0)
1365 return err;
1366 }
1367
1368 ip6gre_netlink_parms(data, &nt->parms);
1369
1370 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1371 return -EEXIST;
1372
1373 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1374 eth_hw_addr_random(dev);
1375
1376 nt->dev = dev;
1377 nt->net = dev_net(dev);
1378 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1379
1380 dev->features |= GRE6_FEATURES;
1381 dev->hw_features |= GRE6_FEATURES;
1382
1383 if (!(nt->parms.o_flags & TUNNEL_SEQ)) {
1384 /* TCP offload with GRE SEQ is not supported, nor
1385 * can we support 2 levels of outer headers requiring
1386 * an update.
1387 */
1388 if (!(nt->parms.o_flags & TUNNEL_CSUM) ||
1389 (nt->encap.type == TUNNEL_ENCAP_NONE)) {
1390 dev->features |= NETIF_F_GSO_SOFTWARE;
1391 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1392 }
1393
1394 /* Can use a lockless transmit, unless we generate
1395 * output sequences
1396 */
1397 dev->features |= NETIF_F_LLTX;
1398 }
1399
1400 err = register_netdevice(dev);
1401 if (err)
1402 goto out;
1403
1404 dev_hold(dev);
1405 ip6gre_tunnel_link(ign, nt);
1406
1407 out:
1408 return err;
1409 }
1410
1411 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
1412 struct nlattr *data[],
1413 struct netlink_ext_ack *extack)
1414 {
1415 struct ip6_tnl *t, *nt = netdev_priv(dev);
1416 struct net *net = nt->net;
1417 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1418 struct __ip6_tnl_parm p;
1419 struct ip_tunnel_encap ipencap;
1420
1421 if (dev == ign->fb_tunnel_dev)
1422 return -EINVAL;
1423
1424 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1425 int err = ip6_tnl_encap_setup(nt, &ipencap);
1426
1427 if (err < 0)
1428 return err;
1429 }
1430
1431 ip6gre_netlink_parms(data, &p);
1432
1433 t = ip6gre_tunnel_locate(net, &p, 0);
1434
1435 if (t) {
1436 if (t->dev != dev)
1437 return -EEXIST;
1438 } else {
1439 t = nt;
1440 }
1441
1442 ip6gre_tunnel_unlink(ign, t);
1443 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
1444 ip6gre_tunnel_link(ign, t);
1445 return 0;
1446 }
1447
1448 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
1449 {
1450 struct net *net = dev_net(dev);
1451 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1452
1453 if (dev != ign->fb_tunnel_dev)
1454 unregister_netdevice_queue(dev, head);
1455 }
1456
1457 static size_t ip6gre_get_size(const struct net_device *dev)
1458 {
1459 return
1460 /* IFLA_GRE_LINK */
1461 nla_total_size(4) +
1462 /* IFLA_GRE_IFLAGS */
1463 nla_total_size(2) +
1464 /* IFLA_GRE_OFLAGS */
1465 nla_total_size(2) +
1466 /* IFLA_GRE_IKEY */
1467 nla_total_size(4) +
1468 /* IFLA_GRE_OKEY */
1469 nla_total_size(4) +
1470 /* IFLA_GRE_LOCAL */
1471 nla_total_size(sizeof(struct in6_addr)) +
1472 /* IFLA_GRE_REMOTE */
1473 nla_total_size(sizeof(struct in6_addr)) +
1474 /* IFLA_GRE_TTL */
1475 nla_total_size(1) +
1476 /* IFLA_GRE_ENCAP_LIMIT */
1477 nla_total_size(1) +
1478 /* IFLA_GRE_FLOWINFO */
1479 nla_total_size(4) +
1480 /* IFLA_GRE_FLAGS */
1481 nla_total_size(4) +
1482 /* IFLA_GRE_ENCAP_TYPE */
1483 nla_total_size(2) +
1484 /* IFLA_GRE_ENCAP_FLAGS */
1485 nla_total_size(2) +
1486 /* IFLA_GRE_ENCAP_SPORT */
1487 nla_total_size(2) +
1488 /* IFLA_GRE_ENCAP_DPORT */
1489 nla_total_size(2) +
1490 /* IFLA_GRE_FWMARK */
1491 nla_total_size(4) +
1492 0;
1493 }
1494
1495 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
1496 {
1497 struct ip6_tnl *t = netdev_priv(dev);
1498 struct __ip6_tnl_parm *p = &t->parms;
1499
1500 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
1501 nla_put_be16(skb, IFLA_GRE_IFLAGS,
1502 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
1503 nla_put_be16(skb, IFLA_GRE_OFLAGS,
1504 gre_tnl_flags_to_gre_flags(p->o_flags)) ||
1505 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
1506 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
1507 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
1508 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
1509 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
1510 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
1511 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
1512 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
1513 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark))
1514 goto nla_put_failure;
1515
1516 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
1517 t->encap.type) ||
1518 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
1519 t->encap.sport) ||
1520 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
1521 t->encap.dport) ||
1522 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
1523 t->encap.flags))
1524 goto nla_put_failure;
1525
1526 return 0;
1527
1528 nla_put_failure:
1529 return -EMSGSIZE;
1530 }
1531
1532 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
1533 [IFLA_GRE_LINK] = { .type = NLA_U32 },
1534 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
1535 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
1536 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
1537 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
1538 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
1539 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
1540 [IFLA_GRE_TTL] = { .type = NLA_U8 },
1541 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
1542 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
1543 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
1544 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 },
1545 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
1546 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
1547 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
1548 [IFLA_GRE_FWMARK] = { .type = NLA_U32 },
1549 };
1550
1551 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
1552 .kind = "ip6gre",
1553 .maxtype = IFLA_GRE_MAX,
1554 .policy = ip6gre_policy,
1555 .priv_size = sizeof(struct ip6_tnl),
1556 .setup = ip6gre_tunnel_setup,
1557 .validate = ip6gre_tunnel_validate,
1558 .newlink = ip6gre_newlink,
1559 .changelink = ip6gre_changelink,
1560 .dellink = ip6gre_dellink,
1561 .get_size = ip6gre_get_size,
1562 .fill_info = ip6gre_fill_info,
1563 .get_link_net = ip6_tnl_get_link_net,
1564 };
1565
1566 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
1567 .kind = "ip6gretap",
1568 .maxtype = IFLA_GRE_MAX,
1569 .policy = ip6gre_policy,
1570 .priv_size = sizeof(struct ip6_tnl),
1571 .setup = ip6gre_tap_setup,
1572 .validate = ip6gre_tap_validate,
1573 .newlink = ip6gre_newlink,
1574 .changelink = ip6gre_changelink,
1575 .get_size = ip6gre_get_size,
1576 .fill_info = ip6gre_fill_info,
1577 .get_link_net = ip6_tnl_get_link_net,
1578 };
1579
1580 /*
1581 * And now the modules code and kernel interface.
1582 */
1583
1584 static int __init ip6gre_init(void)
1585 {
1586 int err;
1587
1588 pr_info("GRE over IPv6 tunneling driver\n");
1589
1590 err = register_pernet_device(&ip6gre_net_ops);
1591 if (err < 0)
1592 return err;
1593
1594 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
1595 if (err < 0) {
1596 pr_info("%s: can't add protocol\n", __func__);
1597 goto add_proto_failed;
1598 }
1599
1600 err = rtnl_link_register(&ip6gre_link_ops);
1601 if (err < 0)
1602 goto rtnl_link_failed;
1603
1604 err = rtnl_link_register(&ip6gre_tap_ops);
1605 if (err < 0)
1606 goto tap_ops_failed;
1607
1608 out:
1609 return err;
1610
1611 tap_ops_failed:
1612 rtnl_link_unregister(&ip6gre_link_ops);
1613 rtnl_link_failed:
1614 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1615 add_proto_failed:
1616 unregister_pernet_device(&ip6gre_net_ops);
1617 goto out;
1618 }
1619
1620 static void __exit ip6gre_fini(void)
1621 {
1622 rtnl_link_unregister(&ip6gre_tap_ops);
1623 rtnl_link_unregister(&ip6gre_link_ops);
1624 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1625 unregister_pernet_device(&ip6gre_net_ops);
1626 }
1627
1628 module_init(ip6gre_init);
1629 module_exit(ip6gre_fini);
1630 MODULE_LICENSE("GPL");
1631 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
1632 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
1633 MODULE_ALIAS_RTNL_LINK("ip6gre");
1634 MODULE_ALIAS_RTNL_LINK("ip6gretap");
1635 MODULE_ALIAS_NETDEV("ip6gre0");
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