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Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[mirror_ubuntu-bionic-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;
436 if (mtu < IPV6_MIN_MTU)
437 mtu = IPV6_MIN_MTU;
438 t->dev->mtu = mtu;
439 break;
440 }
441
442 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
443 t->err_count++;
444 else
445 t->err_count = 1;
446 t->err_time = jiffies;
447 }
448
449 static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
450 {
451 const struct ipv6hdr *ipv6h;
452 struct ip6_tnl *tunnel;
453
454 ipv6h = ipv6_hdr(skb);
455 tunnel = ip6gre_tunnel_lookup(skb->dev,
456 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
457 tpi->proto);
458 if (tunnel) {
459 ip6_tnl_rcv(tunnel, skb, tpi, NULL, false);
460
461 return PACKET_RCVD;
462 }
463
464 return PACKET_REJECT;
465 }
466
467 static int gre_rcv(struct sk_buff *skb)
468 {
469 struct tnl_ptk_info tpi;
470 bool csum_err = false;
471 int hdr_len;
472
473 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
474 if (hdr_len < 0)
475 goto drop;
476
477 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
478 goto drop;
479
480 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
481 return 0;
482
483 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
484 drop:
485 kfree_skb(skb);
486 return 0;
487 }
488
489 static int gre_handle_offloads(struct sk_buff *skb, bool csum)
490 {
491 return iptunnel_handle_offloads(skb,
492 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
493 }
494
495 static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
496 struct net_device *dev, __u8 dsfield,
497 struct flowi6 *fl6, int encap_limit,
498 __u32 *pmtu, __be16 proto)
499 {
500 struct ip6_tnl *tunnel = netdev_priv(dev);
501 __be16 protocol = (dev->type == ARPHRD_ETHER) ?
502 htons(ETH_P_TEB) : proto;
503
504 if (dev->type == ARPHRD_ETHER)
505 IPCB(skb)->flags = 0;
506
507 if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
508 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
509 else
510 fl6->daddr = tunnel->parms.raddr;
511
512 if (tunnel->parms.o_flags & TUNNEL_SEQ)
513 tunnel->o_seqno++;
514
515 /* Push GRE header. */
516 gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags,
517 protocol, tunnel->parms.o_key, htonl(tunnel->o_seqno));
518
519 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
520 NEXTHDR_GRE);
521 }
522
523 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
524 {
525 struct ip6_tnl *t = netdev_priv(dev);
526 const struct iphdr *iph = ip_hdr(skb);
527 int encap_limit = -1;
528 struct flowi6 fl6;
529 __u8 dsfield;
530 __u32 mtu;
531 int err;
532
533 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
534
535 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
536 encap_limit = t->parms.encap_limit;
537
538 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
539
540 dsfield = ipv4_get_dsfield(iph);
541
542 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
543 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
544 & IPV6_TCLASS_MASK;
545 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
546 fl6.flowi6_mark = skb->mark;
547
548 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
549
550 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
551 if (err)
552 return -1;
553
554 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
555 skb->protocol);
556 if (err != 0) {
557 /* XXX: send ICMP error even if DF is not set. */
558 if (err == -EMSGSIZE)
559 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
560 htonl(mtu));
561 return -1;
562 }
563
564 return 0;
565 }
566
567 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
568 {
569 struct ip6_tnl *t = netdev_priv(dev);
570 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
571 int encap_limit = -1;
572 __u16 offset;
573 struct flowi6 fl6;
574 __u8 dsfield;
575 __u32 mtu;
576 int err;
577
578 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
579 return -1;
580
581 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
582 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
583 ipv6h = ipv6_hdr(skb);
584
585 if (offset > 0) {
586 struct ipv6_tlv_tnl_enc_lim *tel;
587 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
588 if (tel->encap_limit == 0) {
589 icmpv6_send(skb, ICMPV6_PARAMPROB,
590 ICMPV6_HDR_FIELD, offset + 2);
591 return -1;
592 }
593 encap_limit = tel->encap_limit - 1;
594 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
595 encap_limit = t->parms.encap_limit;
596
597 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
598
599 dsfield = ipv6_get_dsfield(ipv6h);
600 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
601 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
602 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
603 fl6.flowlabel |= ip6_flowlabel(ipv6h);
604 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
605 fl6.flowi6_mark = skb->mark;
606
607 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
608
609 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
610 return -1;
611
612 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
613 &mtu, skb->protocol);
614 if (err != 0) {
615 if (err == -EMSGSIZE)
616 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
617 return -1;
618 }
619
620 return 0;
621 }
622
623 /**
624 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
625 * @t: the outgoing tunnel device
626 * @hdr: IPv6 header from the incoming packet
627 *
628 * Description:
629 * Avoid trivial tunneling loop by checking that tunnel exit-point
630 * doesn't match source of incoming packet.
631 *
632 * Return:
633 * 1 if conflict,
634 * 0 else
635 **/
636
637 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
638 const struct ipv6hdr *hdr)
639 {
640 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
641 }
642
643 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
644 {
645 struct ip6_tnl *t = netdev_priv(dev);
646 int encap_limit = -1;
647 struct flowi6 fl6;
648 __u32 mtu;
649 int err;
650
651 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
652 encap_limit = t->parms.encap_limit;
653
654 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
655
656 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
657 if (err)
658 return err;
659
660 err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol);
661
662 return err;
663 }
664
665 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
666 struct net_device *dev)
667 {
668 struct ip6_tnl *t = netdev_priv(dev);
669 struct net_device_stats *stats = &t->dev->stats;
670 int ret;
671
672 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
673 goto tx_err;
674
675 switch (skb->protocol) {
676 case htons(ETH_P_IP):
677 ret = ip6gre_xmit_ipv4(skb, dev);
678 break;
679 case htons(ETH_P_IPV6):
680 ret = ip6gre_xmit_ipv6(skb, dev);
681 break;
682 default:
683 ret = ip6gre_xmit_other(skb, dev);
684 break;
685 }
686
687 if (ret < 0)
688 goto tx_err;
689
690 return NETDEV_TX_OK;
691
692 tx_err:
693 stats->tx_errors++;
694 stats->tx_dropped++;
695 kfree_skb(skb);
696 return NETDEV_TX_OK;
697 }
698
699 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
700 {
701 struct net_device *dev = t->dev;
702 struct __ip6_tnl_parm *p = &t->parms;
703 struct flowi6 *fl6 = &t->fl.u.ip6;
704 int t_hlen;
705
706 if (dev->type != ARPHRD_ETHER) {
707 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
708 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
709 }
710
711 /* Set up flowi template */
712 fl6->saddr = p->laddr;
713 fl6->daddr = p->raddr;
714 fl6->flowi6_oif = p->link;
715 fl6->flowlabel = 0;
716 fl6->flowi6_proto = IPPROTO_GRE;
717
718 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
719 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
720 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
721 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
722
723 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
724 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
725
726 if (p->flags&IP6_TNL_F_CAP_XMIT &&
727 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
728 dev->flags |= IFF_POINTOPOINT;
729 else
730 dev->flags &= ~IFF_POINTOPOINT;
731
732 t->tun_hlen = gre_calc_hlen(t->parms.o_flags);
733
734 t->hlen = t->encap_hlen + t->tun_hlen;
735
736 t_hlen = t->hlen + sizeof(struct ipv6hdr);
737
738 if (p->flags & IP6_TNL_F_CAP_XMIT) {
739 int strict = (ipv6_addr_type(&p->raddr) &
740 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
741
742 struct rt6_info *rt = rt6_lookup(t->net,
743 &p->raddr, &p->laddr,
744 p->link, strict);
745
746 if (!rt)
747 return;
748
749 if (rt->dst.dev) {
750 dev->hard_header_len = rt->dst.dev->hard_header_len +
751 t_hlen;
752
753 if (set_mtu) {
754 dev->mtu = rt->dst.dev->mtu - t_hlen;
755 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
756 dev->mtu -= 8;
757 if (dev->type == ARPHRD_ETHER)
758 dev->mtu -= ETH_HLEN;
759
760 if (dev->mtu < IPV6_MIN_MTU)
761 dev->mtu = IPV6_MIN_MTU;
762 }
763 }
764 ip6_rt_put(rt);
765 }
766 }
767
768 static int ip6gre_tnl_change(struct ip6_tnl *t,
769 const struct __ip6_tnl_parm *p, int set_mtu)
770 {
771 t->parms.laddr = p->laddr;
772 t->parms.raddr = p->raddr;
773 t->parms.flags = p->flags;
774 t->parms.hop_limit = p->hop_limit;
775 t->parms.encap_limit = p->encap_limit;
776 t->parms.flowinfo = p->flowinfo;
777 t->parms.link = p->link;
778 t->parms.proto = p->proto;
779 t->parms.i_key = p->i_key;
780 t->parms.o_key = p->o_key;
781 t->parms.i_flags = p->i_flags;
782 t->parms.o_flags = p->o_flags;
783 dst_cache_reset(&t->dst_cache);
784 ip6gre_tnl_link_config(t, set_mtu);
785 return 0;
786 }
787
788 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
789 const struct ip6_tnl_parm2 *u)
790 {
791 p->laddr = u->laddr;
792 p->raddr = u->raddr;
793 p->flags = u->flags;
794 p->hop_limit = u->hop_limit;
795 p->encap_limit = u->encap_limit;
796 p->flowinfo = u->flowinfo;
797 p->link = u->link;
798 p->i_key = u->i_key;
799 p->o_key = u->o_key;
800 p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
801 p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
802 memcpy(p->name, u->name, sizeof(u->name));
803 }
804
805 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
806 const struct __ip6_tnl_parm *p)
807 {
808 u->proto = IPPROTO_GRE;
809 u->laddr = p->laddr;
810 u->raddr = p->raddr;
811 u->flags = p->flags;
812 u->hop_limit = p->hop_limit;
813 u->encap_limit = p->encap_limit;
814 u->flowinfo = p->flowinfo;
815 u->link = p->link;
816 u->i_key = p->i_key;
817 u->o_key = p->o_key;
818 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
819 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
820 memcpy(u->name, p->name, sizeof(u->name));
821 }
822
823 static int ip6gre_tunnel_ioctl(struct net_device *dev,
824 struct ifreq *ifr, int cmd)
825 {
826 int err = 0;
827 struct ip6_tnl_parm2 p;
828 struct __ip6_tnl_parm p1;
829 struct ip6_tnl *t = netdev_priv(dev);
830 struct net *net = t->net;
831 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
832
833 memset(&p1, 0, sizeof(p1));
834
835 switch (cmd) {
836 case SIOCGETTUNNEL:
837 if (dev == ign->fb_tunnel_dev) {
838 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
839 err = -EFAULT;
840 break;
841 }
842 ip6gre_tnl_parm_from_user(&p1, &p);
843 t = ip6gre_tunnel_locate(net, &p1, 0);
844 if (!t)
845 t = netdev_priv(dev);
846 }
847 memset(&p, 0, sizeof(p));
848 ip6gre_tnl_parm_to_user(&p, &t->parms);
849 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
850 err = -EFAULT;
851 break;
852
853 case SIOCADDTUNNEL:
854 case SIOCCHGTUNNEL:
855 err = -EPERM;
856 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
857 goto done;
858
859 err = -EFAULT;
860 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
861 goto done;
862
863 err = -EINVAL;
864 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
865 goto done;
866
867 if (!(p.i_flags&GRE_KEY))
868 p.i_key = 0;
869 if (!(p.o_flags&GRE_KEY))
870 p.o_key = 0;
871
872 ip6gre_tnl_parm_from_user(&p1, &p);
873 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
874
875 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
876 if (t) {
877 if (t->dev != dev) {
878 err = -EEXIST;
879 break;
880 }
881 } else {
882 t = netdev_priv(dev);
883
884 ip6gre_tunnel_unlink(ign, t);
885 synchronize_net();
886 ip6gre_tnl_change(t, &p1, 1);
887 ip6gre_tunnel_link(ign, t);
888 netdev_state_change(dev);
889 }
890 }
891
892 if (t) {
893 err = 0;
894
895 memset(&p, 0, sizeof(p));
896 ip6gre_tnl_parm_to_user(&p, &t->parms);
897 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
898 err = -EFAULT;
899 } else
900 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
901 break;
902
903 case SIOCDELTUNNEL:
904 err = -EPERM;
905 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
906 goto done;
907
908 if (dev == ign->fb_tunnel_dev) {
909 err = -EFAULT;
910 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
911 goto done;
912 err = -ENOENT;
913 ip6gre_tnl_parm_from_user(&p1, &p);
914 t = ip6gre_tunnel_locate(net, &p1, 0);
915 if (!t)
916 goto done;
917 err = -EPERM;
918 if (t == netdev_priv(ign->fb_tunnel_dev))
919 goto done;
920 dev = t->dev;
921 }
922 unregister_netdevice(dev);
923 err = 0;
924 break;
925
926 default:
927 err = -EINVAL;
928 }
929
930 done:
931 return err;
932 }
933
934 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
935 unsigned short type,
936 const void *daddr, const void *saddr, unsigned int len)
937 {
938 struct ip6_tnl *t = netdev_priv(dev);
939 struct ipv6hdr *ipv6h = (struct ipv6hdr *)skb_push(skb, t->hlen);
940 __be16 *p = (__be16 *)(ipv6h+1);
941
942 ip6_flow_hdr(ipv6h, 0,
943 ip6_make_flowlabel(dev_net(dev), skb,
944 t->fl.u.ip6.flowlabel, true,
945 &t->fl.u.ip6));
946 ipv6h->hop_limit = t->parms.hop_limit;
947 ipv6h->nexthdr = NEXTHDR_GRE;
948 ipv6h->saddr = t->parms.laddr;
949 ipv6h->daddr = t->parms.raddr;
950
951 p[0] = t->parms.o_flags;
952 p[1] = htons(type);
953
954 /*
955 * Set the source hardware address.
956 */
957
958 if (saddr)
959 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
960 if (daddr)
961 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
962 if (!ipv6_addr_any(&ipv6h->daddr))
963 return t->hlen;
964
965 return -t->hlen;
966 }
967
968 static const struct header_ops ip6gre_header_ops = {
969 .create = ip6gre_header,
970 };
971
972 static const struct net_device_ops ip6gre_netdev_ops = {
973 .ndo_init = ip6gre_tunnel_init,
974 .ndo_uninit = ip6gre_tunnel_uninit,
975 .ndo_start_xmit = ip6gre_tunnel_xmit,
976 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
977 .ndo_change_mtu = ip6_tnl_change_mtu,
978 .ndo_get_stats64 = ip_tunnel_get_stats64,
979 .ndo_get_iflink = ip6_tnl_get_iflink,
980 };
981
982 static void ip6gre_dev_free(struct net_device *dev)
983 {
984 struct ip6_tnl *t = netdev_priv(dev);
985
986 dst_cache_destroy(&t->dst_cache);
987 free_percpu(dev->tstats);
988 free_netdev(dev);
989 }
990
991 static void ip6gre_tunnel_setup(struct net_device *dev)
992 {
993 dev->netdev_ops = &ip6gre_netdev_ops;
994 dev->destructor = ip6gre_dev_free;
995
996 dev->type = ARPHRD_IP6GRE;
997
998 dev->flags |= IFF_NOARP;
999 dev->addr_len = sizeof(struct in6_addr);
1000 netif_keep_dst(dev);
1001 /* This perm addr will be used as interface identifier by IPv6 */
1002 dev->addr_assign_type = NET_ADDR_RANDOM;
1003 eth_random_addr(dev->perm_addr);
1004 }
1005
1006 static int ip6gre_tunnel_init_common(struct net_device *dev)
1007 {
1008 struct ip6_tnl *tunnel;
1009 int ret;
1010 int t_hlen;
1011
1012 tunnel = netdev_priv(dev);
1013
1014 tunnel->dev = dev;
1015 tunnel->net = dev_net(dev);
1016 strcpy(tunnel->parms.name, dev->name);
1017
1018 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1019 if (!dev->tstats)
1020 return -ENOMEM;
1021
1022 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1023 if (ret) {
1024 free_percpu(dev->tstats);
1025 dev->tstats = NULL;
1026 return ret;
1027 }
1028
1029 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1030 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1031 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1032
1033 dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1034 dev->mtu = ETH_DATA_LEN - t_hlen;
1035 if (dev->type == ARPHRD_ETHER)
1036 dev->mtu -= ETH_HLEN;
1037 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1038 dev->mtu -= 8;
1039
1040 return 0;
1041 }
1042
1043 static int ip6gre_tunnel_init(struct net_device *dev)
1044 {
1045 struct ip6_tnl *tunnel;
1046 int ret;
1047
1048 ret = ip6gre_tunnel_init_common(dev);
1049 if (ret)
1050 return ret;
1051
1052 tunnel = netdev_priv(dev);
1053
1054 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1055 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1056
1057 if (ipv6_addr_any(&tunnel->parms.raddr))
1058 dev->header_ops = &ip6gre_header_ops;
1059
1060 return 0;
1061 }
1062
1063 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1064 {
1065 struct ip6_tnl *tunnel = netdev_priv(dev);
1066
1067 tunnel->dev = dev;
1068 tunnel->net = dev_net(dev);
1069 strcpy(tunnel->parms.name, dev->name);
1070
1071 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1072
1073 dev_hold(dev);
1074 }
1075
1076
1077 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1078 .handler = gre_rcv,
1079 .err_handler = ip6gre_err,
1080 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1081 };
1082
1083 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1084 {
1085 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1086 struct net_device *dev, *aux;
1087 int prio;
1088
1089 for_each_netdev_safe(net, dev, aux)
1090 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1091 dev->rtnl_link_ops == &ip6gre_tap_ops)
1092 unregister_netdevice_queue(dev, head);
1093
1094 for (prio = 0; prio < 4; prio++) {
1095 int h;
1096 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1097 struct ip6_tnl *t;
1098
1099 t = rtnl_dereference(ign->tunnels[prio][h]);
1100
1101 while (t) {
1102 /* If dev is in the same netns, it has already
1103 * been added to the list by the previous loop.
1104 */
1105 if (!net_eq(dev_net(t->dev), net))
1106 unregister_netdevice_queue(t->dev,
1107 head);
1108 t = rtnl_dereference(t->next);
1109 }
1110 }
1111 }
1112 }
1113
1114 static int __net_init ip6gre_init_net(struct net *net)
1115 {
1116 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1117 int err;
1118
1119 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1120 NET_NAME_UNKNOWN,
1121 ip6gre_tunnel_setup);
1122 if (!ign->fb_tunnel_dev) {
1123 err = -ENOMEM;
1124 goto err_alloc_dev;
1125 }
1126 dev_net_set(ign->fb_tunnel_dev, net);
1127 /* FB netdevice is special: we have one, and only one per netns.
1128 * Allowing to move it to another netns is clearly unsafe.
1129 */
1130 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1131
1132
1133 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1134 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1135
1136 err = register_netdev(ign->fb_tunnel_dev);
1137 if (err)
1138 goto err_reg_dev;
1139
1140 rcu_assign_pointer(ign->tunnels_wc[0],
1141 netdev_priv(ign->fb_tunnel_dev));
1142 return 0;
1143
1144 err_reg_dev:
1145 ip6gre_dev_free(ign->fb_tunnel_dev);
1146 err_alloc_dev:
1147 return err;
1148 }
1149
1150 static void __net_exit ip6gre_exit_net(struct net *net)
1151 {
1152 LIST_HEAD(list);
1153
1154 rtnl_lock();
1155 ip6gre_destroy_tunnels(net, &list);
1156 unregister_netdevice_many(&list);
1157 rtnl_unlock();
1158 }
1159
1160 static struct pernet_operations ip6gre_net_ops = {
1161 .init = ip6gre_init_net,
1162 .exit = ip6gre_exit_net,
1163 .id = &ip6gre_net_id,
1164 .size = sizeof(struct ip6gre_net),
1165 };
1166
1167 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
1168 {
1169 __be16 flags;
1170
1171 if (!data)
1172 return 0;
1173
1174 flags = 0;
1175 if (data[IFLA_GRE_IFLAGS])
1176 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1177 if (data[IFLA_GRE_OFLAGS])
1178 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1179 if (flags & (GRE_VERSION|GRE_ROUTING))
1180 return -EINVAL;
1181
1182 return 0;
1183 }
1184
1185 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[])
1186 {
1187 struct in6_addr daddr;
1188
1189 if (tb[IFLA_ADDRESS]) {
1190 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1191 return -EINVAL;
1192 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1193 return -EADDRNOTAVAIL;
1194 }
1195
1196 if (!data)
1197 goto out;
1198
1199 if (data[IFLA_GRE_REMOTE]) {
1200 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1201 if (ipv6_addr_any(&daddr))
1202 return -EINVAL;
1203 }
1204
1205 out:
1206 return ip6gre_tunnel_validate(tb, data);
1207 }
1208
1209
1210 static void ip6gre_netlink_parms(struct nlattr *data[],
1211 struct __ip6_tnl_parm *parms)
1212 {
1213 memset(parms, 0, sizeof(*parms));
1214
1215 if (!data)
1216 return;
1217
1218 if (data[IFLA_GRE_LINK])
1219 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1220
1221 if (data[IFLA_GRE_IFLAGS])
1222 parms->i_flags = gre_flags_to_tnl_flags(
1223 nla_get_be16(data[IFLA_GRE_IFLAGS]));
1224
1225 if (data[IFLA_GRE_OFLAGS])
1226 parms->o_flags = gre_flags_to_tnl_flags(
1227 nla_get_be16(data[IFLA_GRE_OFLAGS]));
1228
1229 if (data[IFLA_GRE_IKEY])
1230 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1231
1232 if (data[IFLA_GRE_OKEY])
1233 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1234
1235 if (data[IFLA_GRE_LOCAL])
1236 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1237
1238 if (data[IFLA_GRE_REMOTE])
1239 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1240
1241 if (data[IFLA_GRE_TTL])
1242 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1243
1244 if (data[IFLA_GRE_ENCAP_LIMIT])
1245 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1246
1247 if (data[IFLA_GRE_FLOWINFO])
1248 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1249
1250 if (data[IFLA_GRE_FLAGS])
1251 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1252 }
1253
1254 static int ip6gre_tap_init(struct net_device *dev)
1255 {
1256 struct ip6_tnl *tunnel;
1257 int ret;
1258
1259 ret = ip6gre_tunnel_init_common(dev);
1260 if (ret)
1261 return ret;
1262
1263 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1264
1265 tunnel = netdev_priv(dev);
1266
1267 ip6gre_tnl_link_config(tunnel, 1);
1268
1269 return 0;
1270 }
1271
1272 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1273 .ndo_init = ip6gre_tap_init,
1274 .ndo_uninit = ip6gre_tunnel_uninit,
1275 .ndo_start_xmit = ip6gre_tunnel_xmit,
1276 .ndo_set_mac_address = eth_mac_addr,
1277 .ndo_validate_addr = eth_validate_addr,
1278 .ndo_change_mtu = ip6_tnl_change_mtu,
1279 .ndo_get_stats64 = ip_tunnel_get_stats64,
1280 .ndo_get_iflink = ip6_tnl_get_iflink,
1281 };
1282
1283 #define GRE6_FEATURES (NETIF_F_SG | \
1284 NETIF_F_FRAGLIST | \
1285 NETIF_F_HIGHDMA | \
1286 NETIF_F_HW_CSUM)
1287
1288 static void ip6gre_tap_setup(struct net_device *dev)
1289 {
1290
1291 ether_setup(dev);
1292
1293 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1294 dev->destructor = ip6gre_dev_free;
1295
1296 dev->features |= NETIF_F_NETNS_LOCAL;
1297 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1298 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1299 }
1300
1301 static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1302 struct ip_tunnel_encap *ipencap)
1303 {
1304 bool ret = false;
1305
1306 memset(ipencap, 0, sizeof(*ipencap));
1307
1308 if (!data)
1309 return ret;
1310
1311 if (data[IFLA_GRE_ENCAP_TYPE]) {
1312 ret = true;
1313 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1314 }
1315
1316 if (data[IFLA_GRE_ENCAP_FLAGS]) {
1317 ret = true;
1318 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1319 }
1320
1321 if (data[IFLA_GRE_ENCAP_SPORT]) {
1322 ret = true;
1323 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1324 }
1325
1326 if (data[IFLA_GRE_ENCAP_DPORT]) {
1327 ret = true;
1328 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1329 }
1330
1331 return ret;
1332 }
1333
1334 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1335 struct nlattr *tb[], struct nlattr *data[])
1336 {
1337 struct ip6_tnl *nt;
1338 struct net *net = dev_net(dev);
1339 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1340 struct ip_tunnel_encap ipencap;
1341 int err;
1342
1343 nt = netdev_priv(dev);
1344
1345 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1346 int err = ip6_tnl_encap_setup(nt, &ipencap);
1347
1348 if (err < 0)
1349 return err;
1350 }
1351
1352 ip6gre_netlink_parms(data, &nt->parms);
1353
1354 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1355 return -EEXIST;
1356
1357 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1358 eth_hw_addr_random(dev);
1359
1360 nt->dev = dev;
1361 nt->net = dev_net(dev);
1362 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1363
1364 dev->features |= GRE6_FEATURES;
1365 dev->hw_features |= GRE6_FEATURES;
1366
1367 if (!(nt->parms.o_flags & TUNNEL_SEQ)) {
1368 /* TCP offload with GRE SEQ is not supported, nor
1369 * can we support 2 levels of outer headers requiring
1370 * an update.
1371 */
1372 if (!(nt->parms.o_flags & TUNNEL_CSUM) ||
1373 (nt->encap.type == TUNNEL_ENCAP_NONE)) {
1374 dev->features |= NETIF_F_GSO_SOFTWARE;
1375 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1376 }
1377
1378 /* Can use a lockless transmit, unless we generate
1379 * output sequences
1380 */
1381 dev->features |= NETIF_F_LLTX;
1382 }
1383
1384 err = register_netdevice(dev);
1385 if (err)
1386 goto out;
1387
1388 dev_hold(dev);
1389 ip6gre_tunnel_link(ign, nt);
1390
1391 out:
1392 return err;
1393 }
1394
1395 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
1396 struct nlattr *data[])
1397 {
1398 struct ip6_tnl *t, *nt = netdev_priv(dev);
1399 struct net *net = nt->net;
1400 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1401 struct __ip6_tnl_parm p;
1402 struct ip_tunnel_encap ipencap;
1403
1404 if (dev == ign->fb_tunnel_dev)
1405 return -EINVAL;
1406
1407 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1408 int err = ip6_tnl_encap_setup(nt, &ipencap);
1409
1410 if (err < 0)
1411 return err;
1412 }
1413
1414 ip6gre_netlink_parms(data, &p);
1415
1416 t = ip6gre_tunnel_locate(net, &p, 0);
1417
1418 if (t) {
1419 if (t->dev != dev)
1420 return -EEXIST;
1421 } else {
1422 t = nt;
1423 }
1424
1425 ip6gre_tunnel_unlink(ign, t);
1426 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
1427 ip6gre_tunnel_link(ign, t);
1428 return 0;
1429 }
1430
1431 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
1432 {
1433 struct net *net = dev_net(dev);
1434 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1435
1436 if (dev != ign->fb_tunnel_dev)
1437 unregister_netdevice_queue(dev, head);
1438 }
1439
1440 static size_t ip6gre_get_size(const struct net_device *dev)
1441 {
1442 return
1443 /* IFLA_GRE_LINK */
1444 nla_total_size(4) +
1445 /* IFLA_GRE_IFLAGS */
1446 nla_total_size(2) +
1447 /* IFLA_GRE_OFLAGS */
1448 nla_total_size(2) +
1449 /* IFLA_GRE_IKEY */
1450 nla_total_size(4) +
1451 /* IFLA_GRE_OKEY */
1452 nla_total_size(4) +
1453 /* IFLA_GRE_LOCAL */
1454 nla_total_size(sizeof(struct in6_addr)) +
1455 /* IFLA_GRE_REMOTE */
1456 nla_total_size(sizeof(struct in6_addr)) +
1457 /* IFLA_GRE_TTL */
1458 nla_total_size(1) +
1459 /* IFLA_GRE_ENCAP_LIMIT */
1460 nla_total_size(1) +
1461 /* IFLA_GRE_FLOWINFO */
1462 nla_total_size(4) +
1463 /* IFLA_GRE_FLAGS */
1464 nla_total_size(4) +
1465 /* IFLA_GRE_ENCAP_TYPE */
1466 nla_total_size(2) +
1467 /* IFLA_GRE_ENCAP_FLAGS */
1468 nla_total_size(2) +
1469 /* IFLA_GRE_ENCAP_SPORT */
1470 nla_total_size(2) +
1471 /* IFLA_GRE_ENCAP_DPORT */
1472 nla_total_size(2) +
1473 0;
1474 }
1475
1476 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
1477 {
1478 struct ip6_tnl *t = netdev_priv(dev);
1479 struct __ip6_tnl_parm *p = &t->parms;
1480
1481 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
1482 nla_put_be16(skb, IFLA_GRE_IFLAGS,
1483 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
1484 nla_put_be16(skb, IFLA_GRE_OFLAGS,
1485 gre_tnl_flags_to_gre_flags(p->o_flags)) ||
1486 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
1487 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
1488 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
1489 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
1490 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
1491 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
1492 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
1493 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags))
1494 goto nla_put_failure;
1495
1496 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
1497 t->encap.type) ||
1498 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
1499 t->encap.sport) ||
1500 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
1501 t->encap.dport) ||
1502 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
1503 t->encap.flags))
1504 goto nla_put_failure;
1505
1506 return 0;
1507
1508 nla_put_failure:
1509 return -EMSGSIZE;
1510 }
1511
1512 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
1513 [IFLA_GRE_LINK] = { .type = NLA_U32 },
1514 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
1515 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
1516 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
1517 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
1518 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
1519 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
1520 [IFLA_GRE_TTL] = { .type = NLA_U8 },
1521 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
1522 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
1523 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
1524 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 },
1525 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
1526 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
1527 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
1528 };
1529
1530 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
1531 .kind = "ip6gre",
1532 .maxtype = IFLA_GRE_MAX,
1533 .policy = ip6gre_policy,
1534 .priv_size = sizeof(struct ip6_tnl),
1535 .setup = ip6gre_tunnel_setup,
1536 .validate = ip6gre_tunnel_validate,
1537 .newlink = ip6gre_newlink,
1538 .changelink = ip6gre_changelink,
1539 .dellink = ip6gre_dellink,
1540 .get_size = ip6gre_get_size,
1541 .fill_info = ip6gre_fill_info,
1542 .get_link_net = ip6_tnl_get_link_net,
1543 };
1544
1545 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
1546 .kind = "ip6gretap",
1547 .maxtype = IFLA_GRE_MAX,
1548 .policy = ip6gre_policy,
1549 .priv_size = sizeof(struct ip6_tnl),
1550 .setup = ip6gre_tap_setup,
1551 .validate = ip6gre_tap_validate,
1552 .newlink = ip6gre_newlink,
1553 .changelink = ip6gre_changelink,
1554 .get_size = ip6gre_get_size,
1555 .fill_info = ip6gre_fill_info,
1556 .get_link_net = ip6_tnl_get_link_net,
1557 };
1558
1559 /*
1560 * And now the modules code and kernel interface.
1561 */
1562
1563 static int __init ip6gre_init(void)
1564 {
1565 int err;
1566
1567 pr_info("GRE over IPv6 tunneling driver\n");
1568
1569 err = register_pernet_device(&ip6gre_net_ops);
1570 if (err < 0)
1571 return err;
1572
1573 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
1574 if (err < 0) {
1575 pr_info("%s: can't add protocol\n", __func__);
1576 goto add_proto_failed;
1577 }
1578
1579 err = rtnl_link_register(&ip6gre_link_ops);
1580 if (err < 0)
1581 goto rtnl_link_failed;
1582
1583 err = rtnl_link_register(&ip6gre_tap_ops);
1584 if (err < 0)
1585 goto tap_ops_failed;
1586
1587 out:
1588 return err;
1589
1590 tap_ops_failed:
1591 rtnl_link_unregister(&ip6gre_link_ops);
1592 rtnl_link_failed:
1593 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1594 add_proto_failed:
1595 unregister_pernet_device(&ip6gre_net_ops);
1596 goto out;
1597 }
1598
1599 static void __exit ip6gre_fini(void)
1600 {
1601 rtnl_link_unregister(&ip6gre_tap_ops);
1602 rtnl_link_unregister(&ip6gre_link_ops);
1603 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1604 unregister_pernet_device(&ip6gre_net_ops);
1605 }
1606
1607 module_init(ip6gre_init);
1608 module_exit(ip6gre_fini);
1609 MODULE_LICENSE("GPL");
1610 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
1611 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
1612 MODULE_ALIAS_RTNL_LINK("ip6gre");
1613 MODULE_ALIAS_RTNL_LINK("ip6gretap");
1614 MODULE_ALIAS_NETDEV("ip6gre0");
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