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xtensa: support DMA buffers in high memory
[cris-mirror.git] / net / ipv6 / ip6_gre.c
blob3c353125546d8701febaad95f81bdaa675cd5d7d
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 #include <net/erspan.h>
59 #include <net/dst_metadata.h>
60
61
62 static bool log_ecn_error = true;
63 module_param(log_ecn_error, bool, 0644);
64 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
65
66 #define IP6_GRE_HASH_SIZE_SHIFT 5
67 #define IP6_GRE_HASH_SIZE (1 << IP6_GRE_HASH_SIZE_SHIFT)
68
69 static unsigned int ip6gre_net_id __read_mostly;
70 struct ip6gre_net {
71 struct ip6_tnl __rcu *tunnels[4][IP6_GRE_HASH_SIZE];
72
73 struct ip6_tnl __rcu *collect_md_tun;
74 struct net_device *fb_tunnel_dev;
75 };
76
77 static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
78 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly;
79 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly;
80 static int ip6gre_tunnel_init(struct net_device *dev);
81 static void ip6gre_tunnel_setup(struct net_device *dev);
82 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
83 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
84
85 /* Tunnel hash table */
86
87 /*
88 4 hash tables:
89
90 3: (remote,local)
91 2: (remote,*)
92 1: (*,local)
93 0: (*,*)
94
95 We require exact key match i.e. if a key is present in packet
96 it will match only tunnel with the same key; if it is not present,
97 it will match only keyless tunnel.
98
99 All keysless packets, if not matched configured keyless tunnels
100 will match fallback tunnel.
101 */
102
103 #define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(IP6_GRE_HASH_SIZE - 1))
104 static u32 HASH_ADDR(const struct in6_addr *addr)
105 {
106 u32 hash = ipv6_addr_hash(addr);
107
108 return hash_32(hash, IP6_GRE_HASH_SIZE_SHIFT);
109 }
110
111 #define tunnels_r_l tunnels[3]
112 #define tunnels_r tunnels[2]
113 #define tunnels_l tunnels[1]
114 #define tunnels_wc tunnels[0]
115
116 /* Given src, dst and key, find appropriate for input tunnel. */
117
118 static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev,
119 const struct in6_addr *remote, const struct in6_addr *local,
120 __be32 key, __be16 gre_proto)
121 {
122 struct net *net = dev_net(dev);
123 int link = dev->ifindex;
124 unsigned int h0 = HASH_ADDR(remote);
125 unsigned int h1 = HASH_KEY(key);
126 struct ip6_tnl *t, *cand = NULL;
127 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
128 int dev_type = (gre_proto == htons(ETH_P_TEB) ||
129 gre_proto == htons(ETH_P_ERSPAN)) ?
130 ARPHRD_ETHER : ARPHRD_IP6GRE;
131 int score, cand_score = 4;
132
133 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
134 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
135 !ipv6_addr_equal(remote, &t->parms.raddr) ||
136 key != t->parms.i_key ||
137 !(t->dev->flags & IFF_UP))
138 continue;
139
140 if (t->dev->type != ARPHRD_IP6GRE &&
141 t->dev->type != dev_type)
142 continue;
143
144 score = 0;
145 if (t->parms.link != link)
146 score |= 1;
147 if (t->dev->type != dev_type)
148 score |= 2;
149 if (score == 0)
150 return t;
151
152 if (score < cand_score) {
153 cand = t;
154 cand_score = score;
155 }
156 }
157
158 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
159 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
160 key != t->parms.i_key ||
161 !(t->dev->flags & IFF_UP))
162 continue;
163
164 if (t->dev->type != ARPHRD_IP6GRE &&
165 t->dev->type != dev_type)
166 continue;
167
168 score = 0;
169 if (t->parms.link != link)
170 score |= 1;
171 if (t->dev->type != dev_type)
172 score |= 2;
173 if (score == 0)
174 return t;
175
176 if (score < cand_score) {
177 cand = t;
178 cand_score = score;
179 }
180 }
181
182 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
183 if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
184 (!ipv6_addr_equal(local, &t->parms.raddr) ||
185 !ipv6_addr_is_multicast(local))) ||
186 key != t->parms.i_key ||
187 !(t->dev->flags & IFF_UP))
188 continue;
189
190 if (t->dev->type != ARPHRD_IP6GRE &&
191 t->dev->type != dev_type)
192 continue;
193
194 score = 0;
195 if (t->parms.link != link)
196 score |= 1;
197 if (t->dev->type != dev_type)
198 score |= 2;
199 if (score == 0)
200 return t;
201
202 if (score < cand_score) {
203 cand = t;
204 cand_score = score;
205 }
206 }
207
208 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
209 if (t->parms.i_key != key ||
210 !(t->dev->flags & IFF_UP))
211 continue;
212
213 if (t->dev->type != ARPHRD_IP6GRE &&
214 t->dev->type != dev_type)
215 continue;
216
217 score = 0;
218 if (t->parms.link != link)
219 score |= 1;
220 if (t->dev->type != dev_type)
221 score |= 2;
222 if (score == 0)
223 return t;
224
225 if (score < cand_score) {
226 cand = t;
227 cand_score = score;
228 }
229 }
230
231 if (cand)
232 return cand;
233
234 t = rcu_dereference(ign->collect_md_tun);
235 if (t && t->dev->flags & IFF_UP)
236 return t;
237
238 dev = ign->fb_tunnel_dev;
239 if (dev->flags & IFF_UP)
240 return netdev_priv(dev);
241
242 return NULL;
243 }
244
245 static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
246 const struct __ip6_tnl_parm *p)
247 {
248 const struct in6_addr *remote = &p->raddr;
249 const struct in6_addr *local = &p->laddr;
250 unsigned int h = HASH_KEY(p->i_key);
251 int prio = 0;
252
253 if (!ipv6_addr_any(local))
254 prio |= 1;
255 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
256 prio |= 2;
257 h ^= HASH_ADDR(remote);
258 }
259
260 return &ign->tunnels[prio][h];
261 }
262
263 static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
264 const struct ip6_tnl *t)
265 {
266 return __ip6gre_bucket(ign, &t->parms);
267 }
268
269 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
270 {
271 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
272
273 if (t->parms.collect_md)
274 rcu_assign_pointer(ign->collect_md_tun, t);
275
276 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
277 rcu_assign_pointer(*tp, t);
278 }
279
280 static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
281 {
282 struct ip6_tnl __rcu **tp;
283 struct ip6_tnl *iter;
284
285 if (t->parms.collect_md)
286 rcu_assign_pointer(ign->collect_md_tun, NULL);
287
288 for (tp = ip6gre_bucket(ign, t);
289 (iter = rtnl_dereference(*tp)) != NULL;
290 tp = &iter->next) {
291 if (t == iter) {
292 rcu_assign_pointer(*tp, t->next);
293 break;
294 }
295 }
296 }
297
298 static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
299 const struct __ip6_tnl_parm *parms,
300 int type)
301 {
302 const struct in6_addr *remote = &parms->raddr;
303 const struct in6_addr *local = &parms->laddr;
304 __be32 key = parms->i_key;
305 int link = parms->link;
306 struct ip6_tnl *t;
307 struct ip6_tnl __rcu **tp;
308 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
309
310 for (tp = __ip6gre_bucket(ign, parms);
311 (t = rtnl_dereference(*tp)) != NULL;
312 tp = &t->next)
313 if (ipv6_addr_equal(local, &t->parms.laddr) &&
314 ipv6_addr_equal(remote, &t->parms.raddr) &&
315 key == t->parms.i_key &&
316 link == t->parms.link &&
317 type == t->dev->type)
318 break;
319
320 return t;
321 }
322
323 static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
324 const struct __ip6_tnl_parm *parms, int create)
325 {
326 struct ip6_tnl *t, *nt;
327 struct net_device *dev;
328 char name[IFNAMSIZ];
329 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
330
331 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
332 if (t && create)
333 return NULL;
334 if (t || !create)
335 return t;
336
337 if (parms->name[0])
338 strlcpy(name, parms->name, IFNAMSIZ);
339 else
340 strcpy(name, "ip6gre%d");
341
342 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
343 ip6gre_tunnel_setup);
344 if (!dev)
345 return NULL;
346
347 dev_net_set(dev, net);
348
349 nt = netdev_priv(dev);
350 nt->parms = *parms;
351 dev->rtnl_link_ops = &ip6gre_link_ops;
352
353 nt->dev = dev;
354 nt->net = dev_net(dev);
355
356 if (register_netdevice(dev) < 0)
357 goto failed_free;
358
359 ip6gre_tnl_link_config(nt, 1);
360
361 /* Can use a lockless transmit, unless we generate output sequences */
362 if (!(nt->parms.o_flags & TUNNEL_SEQ))
363 dev->features |= NETIF_F_LLTX;
364
365 dev_hold(dev);
366 ip6gre_tunnel_link(ign, nt);
367 return nt;
368
369 failed_free:
370 free_netdev(dev);
371 return NULL;
372 }
373
374 static void ip6gre_tunnel_uninit(struct net_device *dev)
375 {
376 struct ip6_tnl *t = netdev_priv(dev);
377 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
378
379 ip6gre_tunnel_unlink(ign, t);
380 dst_cache_reset(&t->dst_cache);
381 dev_put(dev);
382 }
383
384
385 static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
386 u8 type, u8 code, int offset, __be32 info)
387 {
388 struct net *net = dev_net(skb->dev);
389 const struct gre_base_hdr *greh;
390 const struct ipv6hdr *ipv6h;
391 int grehlen = sizeof(*greh);
392 struct ip6_tnl *t;
393 int key_off = 0;
394 __be16 flags;
395 __be32 key;
396
397 if (!pskb_may_pull(skb, offset + grehlen))
398 return;
399 greh = (const struct gre_base_hdr *)(skb->data + offset);
400 flags = greh->flags;
401 if (flags & (GRE_VERSION | GRE_ROUTING))
402 return;
403 if (flags & GRE_CSUM)
404 grehlen += 4;
405 if (flags & GRE_KEY) {
406 key_off = grehlen + offset;
407 grehlen += 4;
408 }
409
410 if (!pskb_may_pull(skb, offset + grehlen))
411 return;
412 ipv6h = (const struct ipv6hdr *)skb->data;
413 greh = (const struct gre_base_hdr *)(skb->data + offset);
414 key = key_off ? *(__be32 *)(skb->data + key_off) : 0;
415
416 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
417 key, greh->protocol);
418 if (!t)
419 return;
420
421 switch (type) {
422 struct ipv6_tlv_tnl_enc_lim *tel;
423 __u32 teli;
424 case ICMPV6_DEST_UNREACH:
425 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
426 t->parms.name);
427 if (code != ICMPV6_PORT_UNREACH)
428 break;
429 return;
430 case ICMPV6_TIME_EXCEED:
431 if (code == ICMPV6_EXC_HOPLIMIT) {
432 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
433 t->parms.name);
434 break;
435 }
436 return;
437 case ICMPV6_PARAMPROB:
438 teli = 0;
439 if (code == ICMPV6_HDR_FIELD)
440 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
441
442 if (teli && teli == be32_to_cpu(info) - 2) {
443 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
444 if (tel->encap_limit == 0) {
445 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
446 t->parms.name);
447 }
448 } else {
449 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
450 t->parms.name);
451 }
452 return;
453 case ICMPV6_PKT_TOOBIG:
454 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
455 return;
456 case NDISC_REDIRECT:
457 ip6_redirect(skb, net, skb->dev->ifindex, 0,
458 sock_net_uid(net, NULL));
459 return;
460 }
461
462 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
463 t->err_count++;
464 else
465 t->err_count = 1;
466 t->err_time = jiffies;
467 }
468
469 static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
470 {
471 const struct ipv6hdr *ipv6h;
472 struct ip6_tnl *tunnel;
473
474 ipv6h = ipv6_hdr(skb);
475 tunnel = ip6gre_tunnel_lookup(skb->dev,
476 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
477 tpi->proto);
478 if (tunnel) {
479 if (tunnel->parms.collect_md) {
480 struct metadata_dst *tun_dst;
481 __be64 tun_id;
482 __be16 flags;
483
484 flags = tpi->flags;
485 tun_id = key32_to_tunnel_id(tpi->key);
486
487 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0);
488 if (!tun_dst)
489 return PACKET_REJECT;
490
491 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
492 } else {
493 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
494 }
495
496 return PACKET_RCVD;
497 }
498
499 return PACKET_REJECT;
500 }
501
502 static int ip6erspan_rcv(struct sk_buff *skb, int gre_hdr_len,
503 struct tnl_ptk_info *tpi)
504 {
505 struct erspan_base_hdr *ershdr;
506 struct erspan_metadata *pkt_md;
507 const struct ipv6hdr *ipv6h;
508 struct erspan_md2 *md2;
509 struct ip6_tnl *tunnel;
510 u8 ver;
511
512 if (unlikely(!pskb_may_pull(skb, sizeof(*ershdr))))
513 return PACKET_REJECT;
514
515 ipv6h = ipv6_hdr(skb);
516 ershdr = (struct erspan_base_hdr *)skb->data;
517 ver = ershdr->ver;
518 tpi->key = cpu_to_be32(get_session_id(ershdr));
519
520 tunnel = ip6gre_tunnel_lookup(skb->dev,
521 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
522 tpi->proto);
523 if (tunnel) {
524 int len = erspan_hdr_len(ver);
525
526 if (unlikely(!pskb_may_pull(skb, len)))
527 return PACKET_REJECT;
528
529 ershdr = (struct erspan_base_hdr *)skb->data;
530 pkt_md = (struct erspan_metadata *)(ershdr + 1);
531
532 if (__iptunnel_pull_header(skb, len,
533 htons(ETH_P_TEB),
534 false, false) < 0)
535 return PACKET_REJECT;
536
537 if (tunnel->parms.collect_md) {
538 struct metadata_dst *tun_dst;
539 struct ip_tunnel_info *info;
540 struct erspan_metadata *md;
541 __be64 tun_id;
542 __be16 flags;
543
544 tpi->flags |= TUNNEL_KEY;
545 flags = tpi->flags;
546 tun_id = key32_to_tunnel_id(tpi->key);
547
548 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id,
549 sizeof(*md));
550 if (!tun_dst)
551 return PACKET_REJECT;
552
553 info = &tun_dst->u.tun_info;
554 md = ip_tunnel_info_opts(info);
555 md->version = ver;
556 md2 = &md->u.md2;
557 memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE :
558 ERSPAN_V2_MDSIZE);
559 info->key.tun_flags |= TUNNEL_ERSPAN_OPT;
560 info->options_len = sizeof(*md);
561
562 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
563
564 } else {
565 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
566 }
567
568 return PACKET_RCVD;
569 }
570
571 return PACKET_REJECT;
572 }
573
574 static int gre_rcv(struct sk_buff *skb)
575 {
576 struct tnl_ptk_info tpi;
577 bool csum_err = false;
578 int hdr_len;
579
580 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
581 if (hdr_len < 0)
582 goto drop;
583
584 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
585 goto drop;
586
587 if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) ||
588 tpi.proto == htons(ETH_P_ERSPAN2))) {
589 if (ip6erspan_rcv(skb, hdr_len, &tpi) == PACKET_RCVD)
590 return 0;
591 goto out;
592 }
593
594 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
595 return 0;
596
597 out:
598 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
599 drop:
600 kfree_skb(skb);
601 return 0;
602 }
603
604 static int gre_handle_offloads(struct sk_buff *skb, bool csum)
605 {
606 return iptunnel_handle_offloads(skb,
607 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
608 }
609
610 static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb,
611 struct net_device *dev,
612 struct flowi6 *fl6, __u8 *dsfield,
613 int *encap_limit)
614 {
615 const struct iphdr *iph = ip_hdr(skb);
616 struct ip6_tnl *t = netdev_priv(dev);
617
618 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
619 *encap_limit = t->parms.encap_limit;
620
621 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
622
623 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
624 *dsfield = ipv4_get_dsfield(iph);
625 else
626 *dsfield = ip6_tclass(t->parms.flowinfo);
627
628 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
629 fl6->flowi6_mark = skb->mark;
630 else
631 fl6->flowi6_mark = t->parms.fwmark;
632
633 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
634 }
635
636 static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb,
637 struct net_device *dev,
638 struct flowi6 *fl6, __u8 *dsfield,
639 int *encap_limit)
640 {
641 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
642 struct ip6_tnl *t = netdev_priv(dev);
643 __u16 offset;
644
645 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
646 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
647
648 if (offset > 0) {
649 struct ipv6_tlv_tnl_enc_lim *tel;
650
651 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
652 if (tel->encap_limit == 0) {
653 icmpv6_send(skb, ICMPV6_PARAMPROB,
654 ICMPV6_HDR_FIELD, offset + 2);
655 return -1;
656 }
657 *encap_limit = tel->encap_limit - 1;
658 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
659 *encap_limit = t->parms.encap_limit;
660 }
661
662 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
663
664 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
665 *dsfield = ipv6_get_dsfield(ipv6h);
666 else
667 *dsfield = ip6_tclass(t->parms.flowinfo);
668
669 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
670 fl6->flowlabel |= ip6_flowlabel(ipv6h);
671
672 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
673 fl6->flowi6_mark = skb->mark;
674 else
675 fl6->flowi6_mark = t->parms.fwmark;
676
677 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
678
679 return 0;
680 }
681
682 static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
683 struct net_device *dev, __u8 dsfield,
684 struct flowi6 *fl6, int encap_limit,
685 __u32 *pmtu, __be16 proto)
686 {
687 struct ip6_tnl *tunnel = netdev_priv(dev);
688 __be16 protocol;
689
690 if (dev->type == ARPHRD_ETHER)
691 IPCB(skb)->flags = 0;
692
693 if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
694 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
695 else
696 fl6->daddr = tunnel->parms.raddr;
697
698 if (tunnel->parms.o_flags & TUNNEL_SEQ)
699 tunnel->o_seqno++;
700
701 /* Push GRE header. */
702 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
703
704 if (tunnel->parms.collect_md) {
705 struct ip_tunnel_info *tun_info;
706 const struct ip_tunnel_key *key;
707 __be16 flags;
708
709 tun_info = skb_tunnel_info(skb);
710 if (unlikely(!tun_info ||
711 !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
712 ip_tunnel_info_af(tun_info) != AF_INET6))
713 return -EINVAL;
714
715 key = &tun_info->key;
716 memset(fl6, 0, sizeof(*fl6));
717 fl6->flowi6_proto = IPPROTO_GRE;
718 fl6->daddr = key->u.ipv6.dst;
719 fl6->flowlabel = key->label;
720 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
721
722 dsfield = key->tos;
723 flags = key->tun_flags & (TUNNEL_CSUM | TUNNEL_KEY);
724 tunnel->tun_hlen = gre_calc_hlen(flags);
725
726 gre_build_header(skb, tunnel->tun_hlen,
727 flags, protocol,
728 tunnel_id_to_key32(tun_info->key.tun_id), 0);
729
730 } else {
731 gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags,
732 protocol, tunnel->parms.o_key,
733 htonl(tunnel->o_seqno));
734 }
735
736 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
737 NEXTHDR_GRE);
738 }
739
740 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
741 {
742 struct ip6_tnl *t = netdev_priv(dev);
743 int encap_limit = -1;
744 struct flowi6 fl6;
745 __u8 dsfield = 0;
746 __u32 mtu;
747 int err;
748
749 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
750
751 if (!t->parms.collect_md)
752 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
753 &dsfield, &encap_limit);
754
755 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
756 if (err)
757 return -1;
758
759 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
760 skb->protocol);
761 if (err != 0) {
762 /* XXX: send ICMP error even if DF is not set. */
763 if (err == -EMSGSIZE)
764 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
765 htonl(mtu));
766 return -1;
767 }
768
769 return 0;
770 }
771
772 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
773 {
774 struct ip6_tnl *t = netdev_priv(dev);
775 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
776 int encap_limit = -1;
777 struct flowi6 fl6;
778 __u8 dsfield = 0;
779 __u32 mtu;
780 int err;
781
782 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
783 return -1;
784
785 if (!t->parms.collect_md &&
786 prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
787 return -1;
788
789 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
790 return -1;
791
792 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
793 &mtu, skb->protocol);
794 if (err != 0) {
795 if (err == -EMSGSIZE)
796 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
797 return -1;
798 }
799
800 return 0;
801 }
802
803 /**
804 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
805 * @t: the outgoing tunnel device
806 * @hdr: IPv6 header from the incoming packet
807 *
808 * Description:
809 * Avoid trivial tunneling loop by checking that tunnel exit-point
810 * doesn't match source of incoming packet.
811 *
812 * Return:
813 * 1 if conflict,
814 * 0 else
815 **/
816
817 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
818 const struct ipv6hdr *hdr)
819 {
820 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
821 }
822
823 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
824 {
825 struct ip6_tnl *t = netdev_priv(dev);
826 int encap_limit = -1;
827 struct flowi6 fl6;
828 __u32 mtu;
829 int err;
830
831 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
832 encap_limit = t->parms.encap_limit;
833
834 if (!t->parms.collect_md)
835 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
836
837 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
838 if (err)
839 return err;
840
841 err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol);
842
843 return err;
844 }
845
846 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
847 struct net_device *dev)
848 {
849 struct ip6_tnl *t = netdev_priv(dev);
850 struct net_device_stats *stats = &t->dev->stats;
851 int ret;
852
853 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
854 goto tx_err;
855
856 switch (skb->protocol) {
857 case htons(ETH_P_IP):
858 ret = ip6gre_xmit_ipv4(skb, dev);
859 break;
860 case htons(ETH_P_IPV6):
861 ret = ip6gre_xmit_ipv6(skb, dev);
862 break;
863 default:
864 ret = ip6gre_xmit_other(skb, dev);
865 break;
866 }
867
868 if (ret < 0)
869 goto tx_err;
870
871 return NETDEV_TX_OK;
872
873 tx_err:
874 stats->tx_errors++;
875 stats->tx_dropped++;
876 kfree_skb(skb);
877 return NETDEV_TX_OK;
878 }
879
880 static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
881 struct net_device *dev)
882 {
883 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
884 struct ip6_tnl *t = netdev_priv(dev);
885 struct dst_entry *dst = skb_dst(skb);
886 struct net_device_stats *stats;
887 bool truncate = false;
888 int encap_limit = -1;
889 __u8 dsfield = false;
890 struct flowi6 fl6;
891 int err = -EINVAL;
892 __u32 mtu;
893
894 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
895 goto tx_err;
896
897 if (gre_handle_offloads(skb, false))
898 goto tx_err;
899
900 if (skb->len > dev->mtu + dev->hard_header_len) {
901 pskb_trim(skb, dev->mtu + dev->hard_header_len);
902 truncate = true;
903 }
904
905 t->parms.o_flags &= ~TUNNEL_KEY;
906 IPCB(skb)->flags = 0;
907
908 /* For collect_md mode, derive fl6 from the tunnel key,
909 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}.
910 */
911 if (t->parms.collect_md) {
912 struct ip_tunnel_info *tun_info;
913 const struct ip_tunnel_key *key;
914 struct erspan_metadata *md;
915 __be32 tun_id;
916
917 tun_info = skb_tunnel_info(skb);
918 if (unlikely(!tun_info ||
919 !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
920 ip_tunnel_info_af(tun_info) != AF_INET6))
921 return -EINVAL;
922
923 key = &tun_info->key;
924 memset(&fl6, 0, sizeof(fl6));
925 fl6.flowi6_proto = IPPROTO_GRE;
926 fl6.daddr = key->u.ipv6.dst;
927 fl6.flowlabel = key->label;
928 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
929
930 dsfield = key->tos;
931 md = ip_tunnel_info_opts(tun_info);
932 if (!md)
933 goto tx_err;
934
935 tun_id = tunnel_id_to_key32(key->tun_id);
936 if (md->version == 1) {
937 erspan_build_header(skb,
938 ntohl(tun_id),
939 ntohl(md->u.index), truncate,
940 false);
941 } else if (md->version == 2) {
942 erspan_build_header_v2(skb,
943 ntohl(tun_id),
944 md->u.md2.dir,
945 get_hwid(&md->u.md2),
946 truncate, false);
947 }
948 } else {
949 switch (skb->protocol) {
950 case htons(ETH_P_IP):
951 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
952 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
953 &dsfield, &encap_limit);
954 break;
955 case htons(ETH_P_IPV6):
956 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
957 goto tx_err;
958 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
959 &dsfield, &encap_limit))
960 goto tx_err;
961 break;
962 default:
963 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
964 break;
965 }
966
967 if (t->parms.erspan_ver == 1)
968 erspan_build_header(skb, ntohl(t->parms.o_key),
969 t->parms.index,
970 truncate, false);
971 else
972 erspan_build_header_v2(skb, ntohl(t->parms.o_key),
973 t->parms.dir,
974 t->parms.hwid,
975 truncate, false);
976 fl6.daddr = t->parms.raddr;
977 }
978
979 /* Push GRE header. */
980 gre_build_header(skb, 8, TUNNEL_SEQ,
981 htons(ETH_P_ERSPAN), 0, htonl(t->o_seqno++));
982
983 /* TooBig packet may have updated dst->dev's mtu */
984 if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu)
985 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu);
986
987 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
988 NEXTHDR_GRE);
989 if (err != 0) {
990 /* XXX: send ICMP error even if DF is not set. */
991 if (err == -EMSGSIZE) {
992 if (skb->protocol == htons(ETH_P_IP))
993 icmp_send(skb, ICMP_DEST_UNREACH,
994 ICMP_FRAG_NEEDED, htonl(mtu));
995 else
996 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
997 }
998
999 goto tx_err;
1000 }
1001 return NETDEV_TX_OK;
1002
1003 tx_err:
1004 stats = &t->dev->stats;
1005 stats->tx_errors++;
1006 stats->tx_dropped++;
1007 kfree_skb(skb);
1008 return NETDEV_TX_OK;
1009 }
1010
1011 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1012 {
1013 struct net_device *dev = t->dev;
1014 struct __ip6_tnl_parm *p = &t->parms;
1015 struct flowi6 *fl6 = &t->fl.u.ip6;
1016 int t_hlen;
1017
1018 if (dev->type != ARPHRD_ETHER) {
1019 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1020 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1021 }
1022
1023 /* Set up flowi template */
1024 fl6->saddr = p->laddr;
1025 fl6->daddr = p->raddr;
1026 fl6->flowi6_oif = p->link;
1027 fl6->flowlabel = 0;
1028 fl6->flowi6_proto = IPPROTO_GRE;
1029
1030 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1031 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1032 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1033 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1034
1035 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1036 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1037
1038 if (p->flags&IP6_TNL_F_CAP_XMIT &&
1039 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1040 dev->flags |= IFF_POINTOPOINT;
1041 else
1042 dev->flags &= ~IFF_POINTOPOINT;
1043
1044 t->tun_hlen = gre_calc_hlen(t->parms.o_flags);
1045
1046 t->hlen = t->encap_hlen + t->tun_hlen;
1047
1048 t_hlen = t->hlen + sizeof(struct ipv6hdr);
1049
1050 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1051 int strict = (ipv6_addr_type(&p->raddr) &
1052 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1053
1054 struct rt6_info *rt = rt6_lookup(t->net,
1055 &p->raddr, &p->laddr,
1056 p->link, strict);
1057
1058 if (!rt)
1059 return;
1060
1061 if (rt->dst.dev) {
1062 dev->hard_header_len = rt->dst.dev->hard_header_len +
1063 t_hlen;
1064
1065 if (set_mtu) {
1066 dev->mtu = rt->dst.dev->mtu - t_hlen;
1067 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1068 dev->mtu -= 8;
1069 if (dev->type == ARPHRD_ETHER)
1070 dev->mtu -= ETH_HLEN;
1071
1072 if (dev->mtu < IPV6_MIN_MTU)
1073 dev->mtu = IPV6_MIN_MTU;
1074 }
1075 }
1076 ip6_rt_put(rt);
1077 }
1078 }
1079
1080 static int ip6gre_tnl_change(struct ip6_tnl *t,
1081 const struct __ip6_tnl_parm *p, int set_mtu)
1082 {
1083 t->parms.laddr = p->laddr;
1084 t->parms.raddr = p->raddr;
1085 t->parms.flags = p->flags;
1086 t->parms.hop_limit = p->hop_limit;
1087 t->parms.encap_limit = p->encap_limit;
1088 t->parms.flowinfo = p->flowinfo;
1089 t->parms.link = p->link;
1090 t->parms.proto = p->proto;
1091 t->parms.i_key = p->i_key;
1092 t->parms.o_key = p->o_key;
1093 t->parms.i_flags = p->i_flags;
1094 t->parms.o_flags = p->o_flags;
1095 t->parms.fwmark = p->fwmark;
1096 dst_cache_reset(&t->dst_cache);
1097 ip6gre_tnl_link_config(t, set_mtu);
1098 return 0;
1099 }
1100
1101 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1102 const struct ip6_tnl_parm2 *u)
1103 {
1104 p->laddr = u->laddr;
1105 p->raddr = u->raddr;
1106 p->flags = u->flags;
1107 p->hop_limit = u->hop_limit;
1108 p->encap_limit = u->encap_limit;
1109 p->flowinfo = u->flowinfo;
1110 p->link = u->link;
1111 p->i_key = u->i_key;
1112 p->o_key = u->o_key;
1113 p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
1114 p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
1115 memcpy(p->name, u->name, sizeof(u->name));
1116 }
1117
1118 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1119 const struct __ip6_tnl_parm *p)
1120 {
1121 u->proto = IPPROTO_GRE;
1122 u->laddr = p->laddr;
1123 u->raddr = p->raddr;
1124 u->flags = p->flags;
1125 u->hop_limit = p->hop_limit;
1126 u->encap_limit = p->encap_limit;
1127 u->flowinfo = p->flowinfo;
1128 u->link = p->link;
1129 u->i_key = p->i_key;
1130 u->o_key = p->o_key;
1131 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1132 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
1133 memcpy(u->name, p->name, sizeof(u->name));
1134 }
1135
1136 static int ip6gre_tunnel_ioctl(struct net_device *dev,
1137 struct ifreq *ifr, int cmd)
1138 {
1139 int err = 0;
1140 struct ip6_tnl_parm2 p;
1141 struct __ip6_tnl_parm p1;
1142 struct ip6_tnl *t = netdev_priv(dev);
1143 struct net *net = t->net;
1144 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1145
1146 memset(&p1, 0, sizeof(p1));
1147
1148 switch (cmd) {
1149 case SIOCGETTUNNEL:
1150 if (dev == ign->fb_tunnel_dev) {
1151 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1152 err = -EFAULT;
1153 break;
1154 }
1155 ip6gre_tnl_parm_from_user(&p1, &p);
1156 t = ip6gre_tunnel_locate(net, &p1, 0);
1157 if (!t)
1158 t = netdev_priv(dev);
1159 }
1160 memset(&p, 0, sizeof(p));
1161 ip6gre_tnl_parm_to_user(&p, &t->parms);
1162 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1163 err = -EFAULT;
1164 break;
1165
1166 case SIOCADDTUNNEL:
1167 case SIOCCHGTUNNEL:
1168 err = -EPERM;
1169 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1170 goto done;
1171
1172 err = -EFAULT;
1173 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1174 goto done;
1175
1176 err = -EINVAL;
1177 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1178 goto done;
1179
1180 if (!(p.i_flags&GRE_KEY))
1181 p.i_key = 0;
1182 if (!(p.o_flags&GRE_KEY))
1183 p.o_key = 0;
1184
1185 ip6gre_tnl_parm_from_user(&p1, &p);
1186 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1187
1188 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1189 if (t) {
1190 if (t->dev != dev) {
1191 err = -EEXIST;
1192 break;
1193 }
1194 } else {
1195 t = netdev_priv(dev);
1196
1197 ip6gre_tunnel_unlink(ign, t);
1198 synchronize_net();
1199 ip6gre_tnl_change(t, &p1, 1);
1200 ip6gre_tunnel_link(ign, t);
1201 netdev_state_change(dev);
1202 }
1203 }
1204
1205 if (t) {
1206 err = 0;
1207
1208 memset(&p, 0, sizeof(p));
1209 ip6gre_tnl_parm_to_user(&p, &t->parms);
1210 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1211 err = -EFAULT;
1212 } else
1213 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1214 break;
1215
1216 case SIOCDELTUNNEL:
1217 err = -EPERM;
1218 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1219 goto done;
1220
1221 if (dev == ign->fb_tunnel_dev) {
1222 err = -EFAULT;
1223 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1224 goto done;
1225 err = -ENOENT;
1226 ip6gre_tnl_parm_from_user(&p1, &p);
1227 t = ip6gre_tunnel_locate(net, &p1, 0);
1228 if (!t)
1229 goto done;
1230 err = -EPERM;
1231 if (t == netdev_priv(ign->fb_tunnel_dev))
1232 goto done;
1233 dev = t->dev;
1234 }
1235 unregister_netdevice(dev);
1236 err = 0;
1237 break;
1238
1239 default:
1240 err = -EINVAL;
1241 }
1242
1243 done:
1244 return err;
1245 }
1246
1247 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1248 unsigned short type, const void *daddr,
1249 const void *saddr, unsigned int len)
1250 {
1251 struct ip6_tnl *t = netdev_priv(dev);
1252 struct ipv6hdr *ipv6h;
1253 __be16 *p;
1254
1255 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
1256 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1257 t->fl.u.ip6.flowlabel,
1258 true, &t->fl.u.ip6));
1259 ipv6h->hop_limit = t->parms.hop_limit;
1260 ipv6h->nexthdr = NEXTHDR_GRE;
1261 ipv6h->saddr = t->parms.laddr;
1262 ipv6h->daddr = t->parms.raddr;
1263
1264 p = (__be16 *)(ipv6h + 1);
1265 p[0] = t->parms.o_flags;
1266 p[1] = htons(type);
1267
1268 /*
1269 * Set the source hardware address.
1270 */
1271
1272 if (saddr)
1273 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1274 if (daddr)
1275 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1276 if (!ipv6_addr_any(&ipv6h->daddr))
1277 return t->hlen;
1278
1279 return -t->hlen;
1280 }
1281
1282 static const struct header_ops ip6gre_header_ops = {
1283 .create = ip6gre_header,
1284 };
1285
1286 static const struct net_device_ops ip6gre_netdev_ops = {
1287 .ndo_init = ip6gre_tunnel_init,
1288 .ndo_uninit = ip6gre_tunnel_uninit,
1289 .ndo_start_xmit = ip6gre_tunnel_xmit,
1290 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
1291 .ndo_change_mtu = ip6_tnl_change_mtu,
1292 .ndo_get_stats64 = ip_tunnel_get_stats64,
1293 .ndo_get_iflink = ip6_tnl_get_iflink,
1294 };
1295
1296 static void ip6gre_dev_free(struct net_device *dev)
1297 {
1298 struct ip6_tnl *t = netdev_priv(dev);
1299
1300 dst_cache_destroy(&t->dst_cache);
1301 free_percpu(dev->tstats);
1302 }
1303
1304 static void ip6gre_tunnel_setup(struct net_device *dev)
1305 {
1306 dev->netdev_ops = &ip6gre_netdev_ops;
1307 dev->needs_free_netdev = true;
1308 dev->priv_destructor = ip6gre_dev_free;
1309
1310 dev->type = ARPHRD_IP6GRE;
1311
1312 dev->flags |= IFF_NOARP;
1313 dev->addr_len = sizeof(struct in6_addr);
1314 netif_keep_dst(dev);
1315 /* This perm addr will be used as interface identifier by IPv6 */
1316 dev->addr_assign_type = NET_ADDR_RANDOM;
1317 eth_random_addr(dev->perm_addr);
1318 }
1319
1320 #define GRE6_FEATURES (NETIF_F_SG | \
1321 NETIF_F_FRAGLIST | \
1322 NETIF_F_HIGHDMA | \
1323 NETIF_F_HW_CSUM)
1324
1325 static void ip6gre_tnl_init_features(struct net_device *dev)
1326 {
1327 struct ip6_tnl *nt = netdev_priv(dev);
1328
1329 dev->features |= GRE6_FEATURES;
1330 dev->hw_features |= GRE6_FEATURES;
1331
1332 if (!(nt->parms.o_flags & TUNNEL_SEQ)) {
1333 /* TCP offload with GRE SEQ is not supported, nor
1334 * can we support 2 levels of outer headers requiring
1335 * an update.
1336 */
1337 if (!(nt->parms.o_flags & TUNNEL_CSUM) ||
1338 nt->encap.type == TUNNEL_ENCAP_NONE) {
1339 dev->features |= NETIF_F_GSO_SOFTWARE;
1340 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1341 }
1342
1343 /* Can use a lockless transmit, unless we generate
1344 * output sequences
1345 */
1346 dev->features |= NETIF_F_LLTX;
1347 }
1348 }
1349
1350 static int ip6gre_tunnel_init_common(struct net_device *dev)
1351 {
1352 struct ip6_tnl *tunnel;
1353 int ret;
1354 int t_hlen;
1355
1356 tunnel = netdev_priv(dev);
1357
1358 tunnel->dev = dev;
1359 tunnel->net = dev_net(dev);
1360 strcpy(tunnel->parms.name, dev->name);
1361
1362 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1363 if (!dev->tstats)
1364 return -ENOMEM;
1365
1366 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1367 if (ret) {
1368 free_percpu(dev->tstats);
1369 dev->tstats = NULL;
1370 return ret;
1371 }
1372
1373 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1374 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1375 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1376
1377 dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1378 dev->mtu = ETH_DATA_LEN - t_hlen;
1379 if (dev->type == ARPHRD_ETHER)
1380 dev->mtu -= ETH_HLEN;
1381 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1382 dev->mtu -= 8;
1383
1384 if (tunnel->parms.collect_md) {
1385 dev->features |= NETIF_F_NETNS_LOCAL;
1386 netif_keep_dst(dev);
1387 }
1388 ip6gre_tnl_init_features(dev);
1389
1390 return 0;
1391 }
1392
1393 static int ip6gre_tunnel_init(struct net_device *dev)
1394 {
1395 struct ip6_tnl *tunnel;
1396 int ret;
1397
1398 ret = ip6gre_tunnel_init_common(dev);
1399 if (ret)
1400 return ret;
1401
1402 tunnel = netdev_priv(dev);
1403
1404 if (tunnel->parms.collect_md)
1405 return 0;
1406
1407 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1408 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1409
1410 if (ipv6_addr_any(&tunnel->parms.raddr))
1411 dev->header_ops = &ip6gre_header_ops;
1412
1413 return 0;
1414 }
1415
1416 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1417 {
1418 struct ip6_tnl *tunnel = netdev_priv(dev);
1419
1420 tunnel->dev = dev;
1421 tunnel->net = dev_net(dev);
1422 strcpy(tunnel->parms.name, dev->name);
1423
1424 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1425
1426 dev_hold(dev);
1427 }
1428
1429 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1430 .handler = gre_rcv,
1431 .err_handler = ip6gre_err,
1432 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1433 };
1434
1435 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1436 {
1437 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1438 struct net_device *dev, *aux;
1439 int prio;
1440
1441 for_each_netdev_safe(net, dev, aux)
1442 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1443 dev->rtnl_link_ops == &ip6gre_tap_ops ||
1444 dev->rtnl_link_ops == &ip6erspan_tap_ops)
1445 unregister_netdevice_queue(dev, head);
1446
1447 for (prio = 0; prio < 4; prio++) {
1448 int h;
1449 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1450 struct ip6_tnl *t;
1451
1452 t = rtnl_dereference(ign->tunnels[prio][h]);
1453
1454 while (t) {
1455 /* If dev is in the same netns, it has already
1456 * been added to the list by the previous loop.
1457 */
1458 if (!net_eq(dev_net(t->dev), net))
1459 unregister_netdevice_queue(t->dev,
1460 head);
1461 t = rtnl_dereference(t->next);
1462 }
1463 }
1464 }
1465 }
1466
1467 static int __net_init ip6gre_init_net(struct net *net)
1468 {
1469 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1470 int err;
1471
1472 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1473 NET_NAME_UNKNOWN,
1474 ip6gre_tunnel_setup);
1475 if (!ign->fb_tunnel_dev) {
1476 err = -ENOMEM;
1477 goto err_alloc_dev;
1478 }
1479 dev_net_set(ign->fb_tunnel_dev, net);
1480 /* FB netdevice is special: we have one, and only one per netns.
1481 * Allowing to move it to another netns is clearly unsafe.
1482 */
1483 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1484
1485
1486 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1487 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1488
1489 err = register_netdev(ign->fb_tunnel_dev);
1490 if (err)
1491 goto err_reg_dev;
1492
1493 rcu_assign_pointer(ign->tunnels_wc[0],
1494 netdev_priv(ign->fb_tunnel_dev));
1495 return 0;
1496
1497 err_reg_dev:
1498 free_netdev(ign->fb_tunnel_dev);
1499 err_alloc_dev:
1500 return err;
1501 }
1502
1503 static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list)
1504 {
1505 struct net *net;
1506 LIST_HEAD(list);
1507
1508 rtnl_lock();
1509 list_for_each_entry(net, net_list, exit_list)
1510 ip6gre_destroy_tunnels(net, &list);
1511 unregister_netdevice_many(&list);
1512 rtnl_unlock();
1513 }
1514
1515 static struct pernet_operations ip6gre_net_ops = {
1516 .init = ip6gre_init_net,
1517 .exit_batch = ip6gre_exit_batch_net,
1518 .id = &ip6gre_net_id,
1519 .size = sizeof(struct ip6gre_net),
1520 };
1521
1522 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1523 struct netlink_ext_ack *extack)
1524 {
1525 __be16 flags;
1526
1527 if (!data)
1528 return 0;
1529
1530 flags = 0;
1531 if (data[IFLA_GRE_IFLAGS])
1532 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1533 if (data[IFLA_GRE_OFLAGS])
1534 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1535 if (flags & (GRE_VERSION|GRE_ROUTING))
1536 return -EINVAL;
1537
1538 return 0;
1539 }
1540
1541 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1542 struct netlink_ext_ack *extack)
1543 {
1544 struct in6_addr daddr;
1545
1546 if (tb[IFLA_ADDRESS]) {
1547 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1548 return -EINVAL;
1549 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1550 return -EADDRNOTAVAIL;
1551 }
1552
1553 if (!data)
1554 goto out;
1555
1556 if (data[IFLA_GRE_REMOTE]) {
1557 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1558 if (ipv6_addr_any(&daddr))
1559 return -EINVAL;
1560 }
1561
1562 out:
1563 return ip6gre_tunnel_validate(tb, data, extack);
1564 }
1565
1566 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1567 struct netlink_ext_ack *extack)
1568 {
1569 __be16 flags = 0;
1570 int ret, ver = 0;
1571
1572 if (!data)
1573 return 0;
1574
1575 ret = ip6gre_tap_validate(tb, data, extack);
1576 if (ret)
1577 return ret;
1578
1579 /* ERSPAN should only have GRE sequence and key flag */
1580 if (data[IFLA_GRE_OFLAGS])
1581 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1582 if (data[IFLA_GRE_IFLAGS])
1583 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1584 if (!data[IFLA_GRE_COLLECT_METADATA] &&
1585 flags != (GRE_SEQ | GRE_KEY))
1586 return -EINVAL;
1587
1588 /* ERSPAN Session ID only has 10-bit. Since we reuse
1589 * 32-bit key field as ID, check it's range.
1590 */
1591 if (data[IFLA_GRE_IKEY] &&
1592 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1593 return -EINVAL;
1594
1595 if (data[IFLA_GRE_OKEY] &&
1596 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1597 return -EINVAL;
1598
1599 if (data[IFLA_GRE_ERSPAN_VER]) {
1600 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1601 if (ver != 1 && ver != 2)
1602 return -EINVAL;
1603 }
1604
1605 if (ver == 1) {
1606 if (data[IFLA_GRE_ERSPAN_INDEX]) {
1607 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1608
1609 if (index & ~INDEX_MASK)
1610 return -EINVAL;
1611 }
1612 } else if (ver == 2) {
1613 if (data[IFLA_GRE_ERSPAN_DIR]) {
1614 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1615
1616 if (dir & ~(DIR_MASK >> DIR_OFFSET))
1617 return -EINVAL;
1618 }
1619
1620 if (data[IFLA_GRE_ERSPAN_HWID]) {
1621 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1622
1623 if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1624 return -EINVAL;
1625 }
1626 }
1627
1628 return 0;
1629 }
1630
1631 static void ip6gre_netlink_parms(struct nlattr *data[],
1632 struct __ip6_tnl_parm *parms)
1633 {
1634 memset(parms, 0, sizeof(*parms));
1635
1636 if (!data)
1637 return;
1638
1639 if (data[IFLA_GRE_LINK])
1640 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1641
1642 if (data[IFLA_GRE_IFLAGS])
1643 parms->i_flags = gre_flags_to_tnl_flags(
1644 nla_get_be16(data[IFLA_GRE_IFLAGS]));
1645
1646 if (data[IFLA_GRE_OFLAGS])
1647 parms->o_flags = gre_flags_to_tnl_flags(
1648 nla_get_be16(data[IFLA_GRE_OFLAGS]));
1649
1650 if (data[IFLA_GRE_IKEY])
1651 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1652
1653 if (data[IFLA_GRE_OKEY])
1654 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1655
1656 if (data[IFLA_GRE_LOCAL])
1657 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1658
1659 if (data[IFLA_GRE_REMOTE])
1660 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1661
1662 if (data[IFLA_GRE_TTL])
1663 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1664
1665 if (data[IFLA_GRE_ENCAP_LIMIT])
1666 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1667
1668 if (data[IFLA_GRE_FLOWINFO])
1669 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1670
1671 if (data[IFLA_GRE_FLAGS])
1672 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1673
1674 if (data[IFLA_GRE_FWMARK])
1675 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1676
1677 if (data[IFLA_GRE_COLLECT_METADATA])
1678 parms->collect_md = true;
1679
1680 if (data[IFLA_GRE_ERSPAN_VER])
1681 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1682
1683 if (parms->erspan_ver == 1) {
1684 if (data[IFLA_GRE_ERSPAN_INDEX])
1685 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1686 } else if (parms->erspan_ver == 2) {
1687 if (data[IFLA_GRE_ERSPAN_DIR])
1688 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1689 if (data[IFLA_GRE_ERSPAN_HWID])
1690 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1691 }
1692 }
1693
1694 static int ip6gre_tap_init(struct net_device *dev)
1695 {
1696 int ret;
1697
1698 ret = ip6gre_tunnel_init_common(dev);
1699 if (ret)
1700 return ret;
1701
1702 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1703
1704 return 0;
1705 }
1706
1707 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1708 .ndo_init = ip6gre_tap_init,
1709 .ndo_uninit = ip6gre_tunnel_uninit,
1710 .ndo_start_xmit = ip6gre_tunnel_xmit,
1711 .ndo_set_mac_address = eth_mac_addr,
1712 .ndo_validate_addr = eth_validate_addr,
1713 .ndo_change_mtu = ip6_tnl_change_mtu,
1714 .ndo_get_stats64 = ip_tunnel_get_stats64,
1715 .ndo_get_iflink = ip6_tnl_get_iflink,
1716 };
1717
1718 static int ip6erspan_tap_init(struct net_device *dev)
1719 {
1720 struct ip6_tnl *tunnel;
1721 int t_hlen;
1722 int ret;
1723
1724 tunnel = netdev_priv(dev);
1725
1726 tunnel->dev = dev;
1727 tunnel->net = dev_net(dev);
1728 strcpy(tunnel->parms.name, dev->name);
1729
1730 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1731 if (!dev->tstats)
1732 return -ENOMEM;
1733
1734 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1735 if (ret) {
1736 free_percpu(dev->tstats);
1737 dev->tstats = NULL;
1738 return ret;
1739 }
1740
1741 tunnel->tun_hlen = 8;
1742 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1743 erspan_hdr_len(tunnel->parms.erspan_ver);
1744 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1745
1746 dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1747 dev->mtu = ETH_DATA_LEN - t_hlen;
1748 if (dev->type == ARPHRD_ETHER)
1749 dev->mtu -= ETH_HLEN;
1750 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1751 dev->mtu -= 8;
1752
1753 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1754 tunnel = netdev_priv(dev);
1755 ip6gre_tnl_link_config(tunnel, 1);
1756
1757 return 0;
1758 }
1759
1760 static const struct net_device_ops ip6erspan_netdev_ops = {
1761 .ndo_init = ip6erspan_tap_init,
1762 .ndo_uninit = ip6gre_tunnel_uninit,
1763 .ndo_start_xmit = ip6erspan_tunnel_xmit,
1764 .ndo_set_mac_address = eth_mac_addr,
1765 .ndo_validate_addr = eth_validate_addr,
1766 .ndo_change_mtu = ip6_tnl_change_mtu,
1767 .ndo_get_stats64 = ip_tunnel_get_stats64,
1768 .ndo_get_iflink = ip6_tnl_get_iflink,
1769 };
1770
1771 static void ip6gre_tap_setup(struct net_device *dev)
1772 {
1773
1774 ether_setup(dev);
1775
1776 dev->max_mtu = 0;
1777 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1778 dev->needs_free_netdev = true;
1779 dev->priv_destructor = ip6gre_dev_free;
1780
1781 dev->features |= NETIF_F_NETNS_LOCAL;
1782 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1783 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1784 netif_keep_dst(dev);
1785 }
1786
1787 static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1788 struct ip_tunnel_encap *ipencap)
1789 {
1790 bool ret = false;
1791
1792 memset(ipencap, 0, sizeof(*ipencap));
1793
1794 if (!data)
1795 return ret;
1796
1797 if (data[IFLA_GRE_ENCAP_TYPE]) {
1798 ret = true;
1799 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1800 }
1801
1802 if (data[IFLA_GRE_ENCAP_FLAGS]) {
1803 ret = true;
1804 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1805 }
1806
1807 if (data[IFLA_GRE_ENCAP_SPORT]) {
1808 ret = true;
1809 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1810 }
1811
1812 if (data[IFLA_GRE_ENCAP_DPORT]) {
1813 ret = true;
1814 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1815 }
1816
1817 return ret;
1818 }
1819
1820 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1821 struct nlattr *tb[], struct nlattr *data[],
1822 struct netlink_ext_ack *extack)
1823 {
1824 struct ip6_tnl *nt;
1825 struct net *net = dev_net(dev);
1826 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1827 struct ip_tunnel_encap ipencap;
1828 int err;
1829
1830 nt = netdev_priv(dev);
1831
1832 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1833 int err = ip6_tnl_encap_setup(nt, &ipencap);
1834
1835 if (err < 0)
1836 return err;
1837 }
1838
1839 ip6gre_netlink_parms(data, &nt->parms);
1840
1841 if (nt->parms.collect_md) {
1842 if (rtnl_dereference(ign->collect_md_tun))
1843 return -EEXIST;
1844 } else {
1845 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1846 return -EEXIST;
1847 }
1848
1849 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1850 eth_hw_addr_random(dev);
1851
1852 nt->dev = dev;
1853 nt->net = dev_net(dev);
1854
1855 err = register_netdevice(dev);
1856 if (err)
1857 goto out;
1858
1859 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1860
1861 if (tb[IFLA_MTU])
1862 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1863
1864 dev_hold(dev);
1865 ip6gre_tunnel_link(ign, nt);
1866
1867 out:
1868 return err;
1869 }
1870
1871 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
1872 struct nlattr *data[],
1873 struct netlink_ext_ack *extack)
1874 {
1875 struct ip6_tnl *t, *nt = netdev_priv(dev);
1876 struct net *net = nt->net;
1877 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1878 struct __ip6_tnl_parm p;
1879 struct ip_tunnel_encap ipencap;
1880
1881 if (dev == ign->fb_tunnel_dev)
1882 return -EINVAL;
1883
1884 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1885 int err = ip6_tnl_encap_setup(nt, &ipencap);
1886
1887 if (err < 0)
1888 return err;
1889 }
1890
1891 ip6gre_netlink_parms(data, &p);
1892
1893 t = ip6gre_tunnel_locate(net, &p, 0);
1894
1895 if (t) {
1896 if (t->dev != dev)
1897 return -EEXIST;
1898 } else {
1899 t = nt;
1900 }
1901
1902 ip6gre_tunnel_unlink(ign, t);
1903 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
1904 ip6gre_tunnel_link(ign, t);
1905 return 0;
1906 }
1907
1908 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
1909 {
1910 struct net *net = dev_net(dev);
1911 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1912
1913 if (dev != ign->fb_tunnel_dev)
1914 unregister_netdevice_queue(dev, head);
1915 }
1916
1917 static size_t ip6gre_get_size(const struct net_device *dev)
1918 {
1919 return
1920 /* IFLA_GRE_LINK */
1921 nla_total_size(4) +
1922 /* IFLA_GRE_IFLAGS */
1923 nla_total_size(2) +
1924 /* IFLA_GRE_OFLAGS */
1925 nla_total_size(2) +
1926 /* IFLA_GRE_IKEY */
1927 nla_total_size(4) +
1928 /* IFLA_GRE_OKEY */
1929 nla_total_size(4) +
1930 /* IFLA_GRE_LOCAL */
1931 nla_total_size(sizeof(struct in6_addr)) +
1932 /* IFLA_GRE_REMOTE */
1933 nla_total_size(sizeof(struct in6_addr)) +
1934 /* IFLA_GRE_TTL */
1935 nla_total_size(1) +
1936 /* IFLA_GRE_ENCAP_LIMIT */
1937 nla_total_size(1) +
1938 /* IFLA_GRE_FLOWINFO */
1939 nla_total_size(4) +
1940 /* IFLA_GRE_FLAGS */
1941 nla_total_size(4) +
1942 /* IFLA_GRE_ENCAP_TYPE */
1943 nla_total_size(2) +
1944 /* IFLA_GRE_ENCAP_FLAGS */
1945 nla_total_size(2) +
1946 /* IFLA_GRE_ENCAP_SPORT */
1947 nla_total_size(2) +
1948 /* IFLA_GRE_ENCAP_DPORT */
1949 nla_total_size(2) +
1950 /* IFLA_GRE_COLLECT_METADATA */
1951 nla_total_size(0) +
1952 /* IFLA_GRE_FWMARK */
1953 nla_total_size(4) +
1954 /* IFLA_GRE_ERSPAN_INDEX */
1955 nla_total_size(4) +
1956 0;
1957 }
1958
1959 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
1960 {
1961 struct ip6_tnl *t = netdev_priv(dev);
1962 struct __ip6_tnl_parm *p = &t->parms;
1963
1964 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
1965 nla_put_be16(skb, IFLA_GRE_IFLAGS,
1966 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
1967 nla_put_be16(skb, IFLA_GRE_OFLAGS,
1968 gre_tnl_flags_to_gre_flags(p->o_flags)) ||
1969 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
1970 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
1971 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
1972 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
1973 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
1974 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
1975 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
1976 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
1977 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark) ||
1978 nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
1979 goto nla_put_failure;
1980
1981 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
1982 t->encap.type) ||
1983 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
1984 t->encap.sport) ||
1985 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
1986 t->encap.dport) ||
1987 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
1988 t->encap.flags))
1989 goto nla_put_failure;
1990
1991 if (p->collect_md) {
1992 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
1993 goto nla_put_failure;
1994 }
1995
1996 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
1997 goto nla_put_failure;
1998
1999 if (p->erspan_ver == 1) {
2000 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2001 goto nla_put_failure;
2002 } else if (p->erspan_ver == 2) {
2003 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
2004 goto nla_put_failure;
2005 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
2006 goto nla_put_failure;
2007 }
2008
2009 return 0;
2010
2011 nla_put_failure:
2012 return -EMSGSIZE;
2013 }
2014
2015 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
2016 [IFLA_GRE_LINK] = { .type = NLA_U32 },
2017 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
2018 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
2019 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
2020 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
2021 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
2022 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
2023 [IFLA_GRE_TTL] = { .type = NLA_U8 },
2024 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
2025 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
2026 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
2027 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 },
2028 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
2029 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
2030 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
2031 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
2032 [IFLA_GRE_FWMARK] = { .type = NLA_U32 },
2033 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
2034 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 },
2035 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 },
2036 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 },
2037 };
2038
2039 static void ip6erspan_tap_setup(struct net_device *dev)
2040 {
2041 ether_setup(dev);
2042
2043 dev->netdev_ops = &ip6erspan_netdev_ops;
2044 dev->needs_free_netdev = true;
2045 dev->priv_destructor = ip6gre_dev_free;
2046
2047 dev->features |= NETIF_F_NETNS_LOCAL;
2048 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2049 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2050 netif_keep_dst(dev);
2051 }
2052
2053 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
2054 .kind = "ip6gre",
2055 .maxtype = IFLA_GRE_MAX,
2056 .policy = ip6gre_policy,
2057 .priv_size = sizeof(struct ip6_tnl),
2058 .setup = ip6gre_tunnel_setup,
2059 .validate = ip6gre_tunnel_validate,
2060 .newlink = ip6gre_newlink,
2061 .changelink = ip6gre_changelink,
2062 .dellink = ip6gre_dellink,
2063 .get_size = ip6gre_get_size,
2064 .fill_info = ip6gre_fill_info,
2065 .get_link_net = ip6_tnl_get_link_net,
2066 };
2067
2068 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
2069 .kind = "ip6gretap",
2070 .maxtype = IFLA_GRE_MAX,
2071 .policy = ip6gre_policy,
2072 .priv_size = sizeof(struct ip6_tnl),
2073 .setup = ip6gre_tap_setup,
2074 .validate = ip6gre_tap_validate,
2075 .newlink = ip6gre_newlink,
2076 .changelink = ip6gre_changelink,
2077 .get_size = ip6gre_get_size,
2078 .fill_info = ip6gre_fill_info,
2079 .get_link_net = ip6_tnl_get_link_net,
2080 };
2081
2082 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = {
2083 .kind = "ip6erspan",
2084 .maxtype = IFLA_GRE_MAX,
2085 .policy = ip6gre_policy,
2086 .priv_size = sizeof(struct ip6_tnl),
2087 .setup = ip6erspan_tap_setup,
2088 .validate = ip6erspan_tap_validate,
2089 .newlink = ip6gre_newlink,
2090 .changelink = ip6gre_changelink,
2091 .get_size = ip6gre_get_size,
2092 .fill_info = ip6gre_fill_info,
2093 .get_link_net = ip6_tnl_get_link_net,
2094 };
2095
2096 /*
2097 * And now the modules code and kernel interface.
2098 */
2099
2100 static int __init ip6gre_init(void)
2101 {
2102 int err;
2103
2104 pr_info("GRE over IPv6 tunneling driver\n");
2105
2106 err = register_pernet_device(&ip6gre_net_ops);
2107 if (err < 0)
2108 return err;
2109
2110 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
2111 if (err < 0) {
2112 pr_info("%s: can't add protocol\n", __func__);
2113 goto add_proto_failed;
2114 }
2115
2116 err = rtnl_link_register(&ip6gre_link_ops);
2117 if (err < 0)
2118 goto rtnl_link_failed;
2119
2120 err = rtnl_link_register(&ip6gre_tap_ops);
2121 if (err < 0)
2122 goto tap_ops_failed;
2123
2124 err = rtnl_link_register(&ip6erspan_tap_ops);
2125 if (err < 0)
2126 goto erspan_link_failed;
2127
2128 out:
2129 return err;
2130
2131 erspan_link_failed:
2132 rtnl_link_unregister(&ip6gre_tap_ops);
2133 tap_ops_failed:
2134 rtnl_link_unregister(&ip6gre_link_ops);
2135 rtnl_link_failed:
2136 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2137 add_proto_failed:
2138 unregister_pernet_device(&ip6gre_net_ops);
2139 goto out;
2140 }
2141
2142 static void __exit ip6gre_fini(void)
2143 {
2144 rtnl_link_unregister(&ip6gre_tap_ops);
2145 rtnl_link_unregister(&ip6gre_link_ops);
2146 rtnl_link_unregister(&ip6erspan_tap_ops);
2147 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2148 unregister_pernet_device(&ip6gre_net_ops);
2149 }
2150
2151 module_init(ip6gre_init);
2152 module_exit(ip6gre_fini);
2153 MODULE_LICENSE("GPL");
2154 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
2155 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
2156 MODULE_ALIAS_RTNL_LINK("ip6gre");
2157 MODULE_ALIAS_RTNL_LINK("ip6gretap");
2158 MODULE_ALIAS_RTNL_LINK("ip6erspan");
2159 MODULE_ALIAS_NETDEV("ip6gre0");
CRIS linux kernel tree