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Merge tag 'block-5.11-2021-01-10' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / net / ipv6 / ip6_gre.c
blobc3bc89b6b1a1afeb449fa29984450bbac2c81412
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * GRE over IPv6 protocol decoder.
4 *
5 * Authors: Dmitry Kozlov (xeb@mail.ru)
6 */
7
8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10 #include <linux/capability.h>
11 #include <linux/module.h>
12 #include <linux/types.h>
13 #include <linux/kernel.h>
14 #include <linux/slab.h>
15 #include <linux/uaccess.h>
16 #include <linux/skbuff.h>
17 #include <linux/netdevice.h>
18 #include <linux/in.h>
19 #include <linux/tcp.h>
20 #include <linux/udp.h>
21 #include <linux/if_arp.h>
22 #include <linux/init.h>
23 #include <linux/in6.h>
24 #include <linux/inetdevice.h>
25 #include <linux/igmp.h>
26 #include <linux/netfilter_ipv4.h>
27 #include <linux/etherdevice.h>
28 #include <linux/if_ether.h>
29 #include <linux/hash.h>
30 #include <linux/if_tunnel.h>
31 #include <linux/ip6_tunnel.h>
32
33 #include <net/sock.h>
34 #include <net/ip.h>
35 #include <net/ip_tunnels.h>
36 #include <net/icmp.h>
37 #include <net/protocol.h>
38 #include <net/addrconf.h>
39 #include <net/arp.h>
40 #include <net/checksum.h>
41 #include <net/dsfield.h>
42 #include <net/inet_ecn.h>
43 #include <net/xfrm.h>
44 #include <net/net_namespace.h>
45 #include <net/netns/generic.h>
46 #include <net/rtnetlink.h>
47
48 #include <net/ipv6.h>
49 #include <net/ip6_fib.h>
50 #include <net/ip6_route.h>
51 #include <net/ip6_tunnel.h>
52 #include <net/gre.h>
53 #include <net/erspan.h>
54 #include <net/dst_metadata.h>
55
56
57 static bool log_ecn_error = true;
58 module_param(log_ecn_error, bool, 0644);
59 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
60
61 #define IP6_GRE_HASH_SIZE_SHIFT 5
62 #define IP6_GRE_HASH_SIZE (1 << IP6_GRE_HASH_SIZE_SHIFT)
63
64 static unsigned int ip6gre_net_id __read_mostly;
65 struct ip6gre_net {
66 struct ip6_tnl __rcu *tunnels[4][IP6_GRE_HASH_SIZE];
67
68 struct ip6_tnl __rcu *collect_md_tun;
69 struct ip6_tnl __rcu *collect_md_tun_erspan;
70 struct net_device *fb_tunnel_dev;
71 };
72
73 static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
74 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly;
75 static struct rtnl_link_ops ip6erspan_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 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu);
81
82 /* Tunnel hash table */
83
84 /*
85 4 hash tables:
86
87 3: (remote,local)
88 2: (remote,*)
89 1: (*,local)
90 0: (*,*)
91
92 We require exact key match i.e. if a key is present in packet
93 it will match only tunnel with the same key; if it is not present,
94 it will match only keyless tunnel.
95
96 All keysless packets, if not matched configured keyless tunnels
97 will match fallback tunnel.
98 */
99
100 #define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(IP6_GRE_HASH_SIZE - 1))
101 static u32 HASH_ADDR(const struct in6_addr *addr)
102 {
103 u32 hash = ipv6_addr_hash(addr);
104
105 return hash_32(hash, IP6_GRE_HASH_SIZE_SHIFT);
106 }
107
108 #define tunnels_r_l tunnels[3]
109 #define tunnels_r tunnels[2]
110 #define tunnels_l tunnels[1]
111 #define tunnels_wc tunnels[0]
112
113 /* Given src, dst and key, find appropriate for input tunnel. */
114
115 static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev,
116 const struct in6_addr *remote, const struct in6_addr *local,
117 __be32 key, __be16 gre_proto)
118 {
119 struct net *net = dev_net(dev);
120 int link = dev->ifindex;
121 unsigned int h0 = HASH_ADDR(remote);
122 unsigned int h1 = HASH_KEY(key);
123 struct ip6_tnl *t, *cand = NULL;
124 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
125 int dev_type = (gre_proto == htons(ETH_P_TEB) ||
126 gre_proto == htons(ETH_P_ERSPAN) ||
127 gre_proto == htons(ETH_P_ERSPAN2)) ?
128 ARPHRD_ETHER : ARPHRD_IP6GRE;
129 int score, cand_score = 4;
130 struct net_device *ndev;
131
132 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
133 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
134 !ipv6_addr_equal(remote, &t->parms.raddr) ||
135 key != t->parms.i_key ||
136 !(t->dev->flags & IFF_UP))
137 continue;
138
139 if (t->dev->type != ARPHRD_IP6GRE &&
140 t->dev->type != dev_type)
141 continue;
142
143 score = 0;
144 if (t->parms.link != link)
145 score |= 1;
146 if (t->dev->type != dev_type)
147 score |= 2;
148 if (score == 0)
149 return t;
150
151 if (score < cand_score) {
152 cand = t;
153 cand_score = score;
154 }
155 }
156
157 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
158 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
159 key != t->parms.i_key ||
160 !(t->dev->flags & IFF_UP))
161 continue;
162
163 if (t->dev->type != ARPHRD_IP6GRE &&
164 t->dev->type != dev_type)
165 continue;
166
167 score = 0;
168 if (t->parms.link != link)
169 score |= 1;
170 if (t->dev->type != dev_type)
171 score |= 2;
172 if (score == 0)
173 return t;
174
175 if (score < cand_score) {
176 cand = t;
177 cand_score = score;
178 }
179 }
180
181 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
182 if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
183 (!ipv6_addr_equal(local, &t->parms.raddr) ||
184 !ipv6_addr_is_multicast(local))) ||
185 key != t->parms.i_key ||
186 !(t->dev->flags & IFF_UP))
187 continue;
188
189 if (t->dev->type != ARPHRD_IP6GRE &&
190 t->dev->type != dev_type)
191 continue;
192
193 score = 0;
194 if (t->parms.link != link)
195 score |= 1;
196 if (t->dev->type != dev_type)
197 score |= 2;
198 if (score == 0)
199 return t;
200
201 if (score < cand_score) {
202 cand = t;
203 cand_score = score;
204 }
205 }
206
207 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
208 if (t->parms.i_key != key ||
209 !(t->dev->flags & IFF_UP))
210 continue;
211
212 if (t->dev->type != ARPHRD_IP6GRE &&
213 t->dev->type != dev_type)
214 continue;
215
216 score = 0;
217 if (t->parms.link != link)
218 score |= 1;
219 if (t->dev->type != dev_type)
220 score |= 2;
221 if (score == 0)
222 return t;
223
224 if (score < cand_score) {
225 cand = t;
226 cand_score = score;
227 }
228 }
229
230 if (cand)
231 return cand;
232
233 if (gre_proto == htons(ETH_P_ERSPAN) ||
234 gre_proto == htons(ETH_P_ERSPAN2))
235 t = rcu_dereference(ign->collect_md_tun_erspan);
236 else
237 t = rcu_dereference(ign->collect_md_tun);
238
239 if (t && t->dev->flags & IFF_UP)
240 return t;
241
242 ndev = READ_ONCE(ign->fb_tunnel_dev);
243 if (ndev && ndev->flags & IFF_UP)
244 return netdev_priv(ndev);
245
246 return NULL;
247 }
248
249 static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
250 const struct __ip6_tnl_parm *p)
251 {
252 const struct in6_addr *remote = &p->raddr;
253 const struct in6_addr *local = &p->laddr;
254 unsigned int h = HASH_KEY(p->i_key);
255 int prio = 0;
256
257 if (!ipv6_addr_any(local))
258 prio |= 1;
259 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
260 prio |= 2;
261 h ^= HASH_ADDR(remote);
262 }
263
264 return &ign->tunnels[prio][h];
265 }
266
267 static void ip6gre_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
268 {
269 if (t->parms.collect_md)
270 rcu_assign_pointer(ign->collect_md_tun, t);
271 }
272
273 static void ip6erspan_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
274 {
275 if (t->parms.collect_md)
276 rcu_assign_pointer(ign->collect_md_tun_erspan, t);
277 }
278
279 static void ip6gre_tunnel_unlink_md(struct ip6gre_net *ign, struct ip6_tnl *t)
280 {
281 if (t->parms.collect_md)
282 rcu_assign_pointer(ign->collect_md_tun, NULL);
283 }
284
285 static void ip6erspan_tunnel_unlink_md(struct ip6gre_net *ign,
286 struct ip6_tnl *t)
287 {
288 if (t->parms.collect_md)
289 rcu_assign_pointer(ign->collect_md_tun_erspan, NULL);
290 }
291
292 static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
293 const struct ip6_tnl *t)
294 {
295 return __ip6gre_bucket(ign, &t->parms);
296 }
297
298 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
299 {
300 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
301
302 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
303 rcu_assign_pointer(*tp, t);
304 }
305
306 static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
307 {
308 struct ip6_tnl __rcu **tp;
309 struct ip6_tnl *iter;
310
311 for (tp = ip6gre_bucket(ign, t);
312 (iter = rtnl_dereference(*tp)) != NULL;
313 tp = &iter->next) {
314 if (t == iter) {
315 rcu_assign_pointer(*tp, t->next);
316 break;
317 }
318 }
319 }
320
321 static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
322 const struct __ip6_tnl_parm *parms,
323 int type)
324 {
325 const struct in6_addr *remote = &parms->raddr;
326 const struct in6_addr *local = &parms->laddr;
327 __be32 key = parms->i_key;
328 int link = parms->link;
329 struct ip6_tnl *t;
330 struct ip6_tnl __rcu **tp;
331 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
332
333 for (tp = __ip6gre_bucket(ign, parms);
334 (t = rtnl_dereference(*tp)) != NULL;
335 tp = &t->next)
336 if (ipv6_addr_equal(local, &t->parms.laddr) &&
337 ipv6_addr_equal(remote, &t->parms.raddr) &&
338 key == t->parms.i_key &&
339 link == t->parms.link &&
340 type == t->dev->type)
341 break;
342
343 return t;
344 }
345
346 static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
347 const struct __ip6_tnl_parm *parms, int create)
348 {
349 struct ip6_tnl *t, *nt;
350 struct net_device *dev;
351 char name[IFNAMSIZ];
352 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
353
354 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
355 if (t && create)
356 return NULL;
357 if (t || !create)
358 return t;
359
360 if (parms->name[0]) {
361 if (!dev_valid_name(parms->name))
362 return NULL;
363 strlcpy(name, parms->name, IFNAMSIZ);
364 } else {
365 strcpy(name, "ip6gre%d");
366 }
367 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
368 ip6gre_tunnel_setup);
369 if (!dev)
370 return NULL;
371
372 dev_net_set(dev, net);
373
374 nt = netdev_priv(dev);
375 nt->parms = *parms;
376 dev->rtnl_link_ops = &ip6gre_link_ops;
377
378 nt->dev = dev;
379 nt->net = dev_net(dev);
380
381 if (register_netdevice(dev) < 0)
382 goto failed_free;
383
384 ip6gre_tnl_link_config(nt, 1);
385
386 /* Can use a lockless transmit, unless we generate output sequences */
387 if (!(nt->parms.o_flags & TUNNEL_SEQ))
388 dev->features |= NETIF_F_LLTX;
389
390 dev_hold(dev);
391 ip6gre_tunnel_link(ign, nt);
392 return nt;
393
394 failed_free:
395 free_netdev(dev);
396 return NULL;
397 }
398
399 static void ip6erspan_tunnel_uninit(struct net_device *dev)
400 {
401 struct ip6_tnl *t = netdev_priv(dev);
402 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
403
404 ip6erspan_tunnel_unlink_md(ign, t);
405 ip6gre_tunnel_unlink(ign, t);
406 dst_cache_reset(&t->dst_cache);
407 dev_put(dev);
408 }
409
410 static void ip6gre_tunnel_uninit(struct net_device *dev)
411 {
412 struct ip6_tnl *t = netdev_priv(dev);
413 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
414
415 ip6gre_tunnel_unlink_md(ign, t);
416 ip6gre_tunnel_unlink(ign, t);
417 if (ign->fb_tunnel_dev == dev)
418 WRITE_ONCE(ign->fb_tunnel_dev, NULL);
419 dst_cache_reset(&t->dst_cache);
420 dev_put(dev);
421 }
422
423
424 static int ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
425 u8 type, u8 code, int offset, __be32 info)
426 {
427 struct net *net = dev_net(skb->dev);
428 const struct ipv6hdr *ipv6h;
429 struct tnl_ptk_info tpi;
430 struct ip6_tnl *t;
431
432 if (gre_parse_header(skb, &tpi, NULL, htons(ETH_P_IPV6),
433 offset) < 0)
434 return -EINVAL;
435
436 ipv6h = (const struct ipv6hdr *)skb->data;
437 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
438 tpi.key, tpi.proto);
439 if (!t)
440 return -ENOENT;
441
442 switch (type) {
443 case ICMPV6_DEST_UNREACH:
444 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
445 t->parms.name);
446 if (code != ICMPV6_PORT_UNREACH)
447 break;
448 return 0;
449 case ICMPV6_TIME_EXCEED:
450 if (code == ICMPV6_EXC_HOPLIMIT) {
451 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
452 t->parms.name);
453 break;
454 }
455 return 0;
456 case ICMPV6_PARAMPROB: {
457 struct ipv6_tlv_tnl_enc_lim *tel;
458 __u32 teli;
459
460 teli = 0;
461 if (code == ICMPV6_HDR_FIELD)
462 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
463
464 if (teli && teli == be32_to_cpu(info) - 2) {
465 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
466 if (tel->encap_limit == 0) {
467 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
468 t->parms.name);
469 }
470 } else {
471 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
472 t->parms.name);
473 }
474 return 0;
475 }
476 case ICMPV6_PKT_TOOBIG:
477 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
478 return 0;
479 case NDISC_REDIRECT:
480 ip6_redirect(skb, net, skb->dev->ifindex, 0,
481 sock_net_uid(net, NULL));
482 return 0;
483 }
484
485 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
486 t->err_count++;
487 else
488 t->err_count = 1;
489 t->err_time = jiffies;
490
491 return 0;
492 }
493
494 static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
495 {
496 const struct ipv6hdr *ipv6h;
497 struct ip6_tnl *tunnel;
498
499 ipv6h = ipv6_hdr(skb);
500 tunnel = ip6gre_tunnel_lookup(skb->dev,
501 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
502 tpi->proto);
503 if (tunnel) {
504 if (tunnel->parms.collect_md) {
505 struct metadata_dst *tun_dst;
506 __be64 tun_id;
507 __be16 flags;
508
509 flags = tpi->flags;
510 tun_id = key32_to_tunnel_id(tpi->key);
511
512 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0);
513 if (!tun_dst)
514 return PACKET_REJECT;
515
516 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
517 } else {
518 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
519 }
520
521 return PACKET_RCVD;
522 }
523
524 return PACKET_REJECT;
525 }
526
527 static int ip6erspan_rcv(struct sk_buff *skb,
528 struct tnl_ptk_info *tpi,
529 int gre_hdr_len)
530 {
531 struct erspan_base_hdr *ershdr;
532 const struct ipv6hdr *ipv6h;
533 struct erspan_md2 *md2;
534 struct ip6_tnl *tunnel;
535 u8 ver;
536
537 ipv6h = ipv6_hdr(skb);
538 ershdr = (struct erspan_base_hdr *)skb->data;
539 ver = ershdr->ver;
540
541 tunnel = ip6gre_tunnel_lookup(skb->dev,
542 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
543 tpi->proto);
544 if (tunnel) {
545 int len = erspan_hdr_len(ver);
546
547 if (unlikely(!pskb_may_pull(skb, len)))
548 return PACKET_REJECT;
549
550 if (__iptunnel_pull_header(skb, len,
551 htons(ETH_P_TEB),
552 false, false) < 0)
553 return PACKET_REJECT;
554
555 if (tunnel->parms.collect_md) {
556 struct erspan_metadata *pkt_md, *md;
557 struct metadata_dst *tun_dst;
558 struct ip_tunnel_info *info;
559 unsigned char *gh;
560 __be64 tun_id;
561 __be16 flags;
562
563 tpi->flags |= TUNNEL_KEY;
564 flags = tpi->flags;
565 tun_id = key32_to_tunnel_id(tpi->key);
566
567 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id,
568 sizeof(*md));
569 if (!tun_dst)
570 return PACKET_REJECT;
571
572 /* skb can be uncloned in __iptunnel_pull_header, so
573 * old pkt_md is no longer valid and we need to reset
574 * it
575 */
576 gh = skb_network_header(skb) +
577 skb_network_header_len(skb);
578 pkt_md = (struct erspan_metadata *)(gh + gre_hdr_len +
579 sizeof(*ershdr));
580 info = &tun_dst->u.tun_info;
581 md = ip_tunnel_info_opts(info);
582 md->version = ver;
583 md2 = &md->u.md2;
584 memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE :
585 ERSPAN_V2_MDSIZE);
586 info->key.tun_flags |= TUNNEL_ERSPAN_OPT;
587 info->options_len = sizeof(*md);
588
589 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
590
591 } else {
592 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
593 }
594
595 return PACKET_RCVD;
596 }
597
598 return PACKET_REJECT;
599 }
600
601 static int gre_rcv(struct sk_buff *skb)
602 {
603 struct tnl_ptk_info tpi;
604 bool csum_err = false;
605 int hdr_len;
606
607 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
608 if (hdr_len < 0)
609 goto drop;
610
611 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
612 goto drop;
613
614 if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) ||
615 tpi.proto == htons(ETH_P_ERSPAN2))) {
616 if (ip6erspan_rcv(skb, &tpi, hdr_len) == PACKET_RCVD)
617 return 0;
618 goto out;
619 }
620
621 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
622 return 0;
623
624 out:
625 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
626 drop:
627 kfree_skb(skb);
628 return 0;
629 }
630
631 static int gre_handle_offloads(struct sk_buff *skb, bool csum)
632 {
633 return iptunnel_handle_offloads(skb,
634 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
635 }
636
637 static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb,
638 struct net_device *dev,
639 struct flowi6 *fl6, __u8 *dsfield,
640 int *encap_limit)
641 {
642 const struct iphdr *iph = ip_hdr(skb);
643 struct ip6_tnl *t = netdev_priv(dev);
644
645 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
646 *encap_limit = t->parms.encap_limit;
647
648 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
649
650 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
651 *dsfield = ipv4_get_dsfield(iph);
652 else
653 *dsfield = ip6_tclass(t->parms.flowinfo);
654
655 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
656 fl6->flowi6_mark = skb->mark;
657 else
658 fl6->flowi6_mark = t->parms.fwmark;
659
660 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
661 }
662
663 static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb,
664 struct net_device *dev,
665 struct flowi6 *fl6, __u8 *dsfield,
666 int *encap_limit)
667 {
668 struct ipv6hdr *ipv6h;
669 struct ip6_tnl *t = netdev_priv(dev);
670 __u16 offset;
671
672 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
673 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
674 ipv6h = ipv6_hdr(skb);
675
676 if (offset > 0) {
677 struct ipv6_tlv_tnl_enc_lim *tel;
678
679 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
680 if (tel->encap_limit == 0) {
681 icmpv6_send(skb, ICMPV6_PARAMPROB,
682 ICMPV6_HDR_FIELD, offset + 2);
683 return -1;
684 }
685 *encap_limit = tel->encap_limit - 1;
686 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
687 *encap_limit = t->parms.encap_limit;
688 }
689
690 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
691
692 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
693 *dsfield = ipv6_get_dsfield(ipv6h);
694 else
695 *dsfield = ip6_tclass(t->parms.flowinfo);
696
697 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
698 fl6->flowlabel |= ip6_flowlabel(ipv6h);
699
700 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
701 fl6->flowi6_mark = skb->mark;
702 else
703 fl6->flowi6_mark = t->parms.fwmark;
704
705 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
706
707 return 0;
708 }
709
710 static struct ip_tunnel_info *skb_tunnel_info_txcheck(struct sk_buff *skb)
711 {
712 struct ip_tunnel_info *tun_info;
713
714 tun_info = skb_tunnel_info(skb);
715 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX)))
716 return ERR_PTR(-EINVAL);
717
718 return tun_info;
719 }
720
721 static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
722 struct net_device *dev, __u8 dsfield,
723 struct flowi6 *fl6, int encap_limit,
724 __u32 *pmtu, __be16 proto)
725 {
726 struct ip6_tnl *tunnel = netdev_priv(dev);
727 __be16 protocol;
728
729 if (dev->type == ARPHRD_ETHER)
730 IPCB(skb)->flags = 0;
731
732 if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
733 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
734 else
735 fl6->daddr = tunnel->parms.raddr;
736
737 if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen))
738 return -ENOMEM;
739
740 /* Push GRE header. */
741 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
742
743 if (tunnel->parms.collect_md) {
744 struct ip_tunnel_info *tun_info;
745 const struct ip_tunnel_key *key;
746 __be16 flags;
747
748 tun_info = skb_tunnel_info_txcheck(skb);
749 if (IS_ERR(tun_info) ||
750 unlikely(ip_tunnel_info_af(tun_info) != AF_INET6))
751 return -EINVAL;
752
753 key = &tun_info->key;
754 memset(fl6, 0, sizeof(*fl6));
755 fl6->flowi6_proto = IPPROTO_GRE;
756 fl6->daddr = key->u.ipv6.dst;
757 fl6->flowlabel = key->label;
758 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
759
760 dsfield = key->tos;
761 flags = key->tun_flags &
762 (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ);
763 tunnel->tun_hlen = gre_calc_hlen(flags);
764
765 gre_build_header(skb, tunnel->tun_hlen,
766 flags, protocol,
767 tunnel_id_to_key32(tun_info->key.tun_id),
768 (flags & TUNNEL_SEQ) ? htonl(tunnel->o_seqno++)
769 : 0);
770
771 } else {
772 if (tunnel->parms.o_flags & TUNNEL_SEQ)
773 tunnel->o_seqno++;
774
775 gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags,
776 protocol, tunnel->parms.o_key,
777 htonl(tunnel->o_seqno));
778 }
779
780 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
781 NEXTHDR_GRE);
782 }
783
784 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
785 {
786 struct ip6_tnl *t = netdev_priv(dev);
787 int encap_limit = -1;
788 struct flowi6 fl6;
789 __u8 dsfield = 0;
790 __u32 mtu;
791 int err;
792
793 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
794
795 if (!t->parms.collect_md)
796 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
797 &dsfield, &encap_limit);
798
799 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
800 if (err)
801 return -1;
802
803 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
804 skb->protocol);
805 if (err != 0) {
806 /* XXX: send ICMP error even if DF is not set. */
807 if (err == -EMSGSIZE)
808 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
809 htonl(mtu));
810 return -1;
811 }
812
813 return 0;
814 }
815
816 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
817 {
818 struct ip6_tnl *t = netdev_priv(dev);
819 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
820 int encap_limit = -1;
821 struct flowi6 fl6;
822 __u8 dsfield = 0;
823 __u32 mtu;
824 int err;
825
826 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
827 return -1;
828
829 if (!t->parms.collect_md &&
830 prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
831 return -1;
832
833 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
834 return -1;
835
836 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
837 &mtu, skb->protocol);
838 if (err != 0) {
839 if (err == -EMSGSIZE)
840 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
841 return -1;
842 }
843
844 return 0;
845 }
846
847 /**
848 * ip6gre_tnl_addr_conflict - compare packet addresses to tunnel's own
849 * @t: the outgoing tunnel device
850 * @hdr: IPv6 header from the incoming packet
851 *
852 * Description:
853 * Avoid trivial tunneling loop by checking that tunnel exit-point
854 * doesn't match source of incoming packet.
855 *
856 * Return:
857 * 1 if conflict,
858 * 0 else
859 **/
860
861 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
862 const struct ipv6hdr *hdr)
863 {
864 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
865 }
866
867 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
868 {
869 struct ip6_tnl *t = netdev_priv(dev);
870 int encap_limit = -1;
871 struct flowi6 fl6;
872 __u32 mtu;
873 int err;
874
875 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
876 encap_limit = t->parms.encap_limit;
877
878 if (!t->parms.collect_md)
879 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
880
881 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
882 if (err)
883 return err;
884
885 err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol);
886
887 return err;
888 }
889
890 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
891 struct net_device *dev)
892 {
893 struct ip6_tnl *t = netdev_priv(dev);
894 struct net_device_stats *stats = &t->dev->stats;
895 int ret;
896
897 if (!pskb_inet_may_pull(skb))
898 goto tx_err;
899
900 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
901 goto tx_err;
902
903 switch (skb->protocol) {
904 case htons(ETH_P_IP):
905 ret = ip6gre_xmit_ipv4(skb, dev);
906 break;
907 case htons(ETH_P_IPV6):
908 ret = ip6gre_xmit_ipv6(skb, dev);
909 break;
910 default:
911 ret = ip6gre_xmit_other(skb, dev);
912 break;
913 }
914
915 if (ret < 0)
916 goto tx_err;
917
918 return NETDEV_TX_OK;
919
920 tx_err:
921 if (!t->parms.collect_md || !IS_ERR(skb_tunnel_info_txcheck(skb)))
922 stats->tx_errors++;
923 stats->tx_dropped++;
924 kfree_skb(skb);
925 return NETDEV_TX_OK;
926 }
927
928 static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
929 struct net_device *dev)
930 {
931 struct ip_tunnel_info *tun_info = NULL;
932 struct ip6_tnl *t = netdev_priv(dev);
933 struct dst_entry *dst = skb_dst(skb);
934 struct net_device_stats *stats;
935 bool truncate = false;
936 int encap_limit = -1;
937 __u8 dsfield = false;
938 struct flowi6 fl6;
939 int err = -EINVAL;
940 __be16 proto;
941 __u32 mtu;
942 int nhoff;
943 int thoff;
944
945 if (!pskb_inet_may_pull(skb))
946 goto tx_err;
947
948 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
949 goto tx_err;
950
951 if (gre_handle_offloads(skb, false))
952 goto tx_err;
953
954 if (skb->len > dev->mtu + dev->hard_header_len) {
955 pskb_trim(skb, dev->mtu + dev->hard_header_len);
956 truncate = true;
957 }
958
959 nhoff = skb_network_header(skb) - skb_mac_header(skb);
960 if (skb->protocol == htons(ETH_P_IP) &&
961 (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff))
962 truncate = true;
963
964 thoff = skb_transport_header(skb) - skb_mac_header(skb);
965 if (skb->protocol == htons(ETH_P_IPV6) &&
966 (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff))
967 truncate = true;
968
969 if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen))
970 goto tx_err;
971
972 t->parms.o_flags &= ~TUNNEL_KEY;
973 IPCB(skb)->flags = 0;
974
975 /* For collect_md mode, derive fl6 from the tunnel key,
976 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}.
977 */
978 if (t->parms.collect_md) {
979 const struct ip_tunnel_key *key;
980 struct erspan_metadata *md;
981 __be32 tun_id;
982
983 tun_info = skb_tunnel_info_txcheck(skb);
984 if (IS_ERR(tun_info) ||
985 unlikely(ip_tunnel_info_af(tun_info) != AF_INET6))
986 goto tx_err;
987
988 key = &tun_info->key;
989 memset(&fl6, 0, sizeof(fl6));
990 fl6.flowi6_proto = IPPROTO_GRE;
991 fl6.daddr = key->u.ipv6.dst;
992 fl6.flowlabel = key->label;
993 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
994
995 dsfield = key->tos;
996 if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT))
997 goto tx_err;
998 if (tun_info->options_len < sizeof(*md))
999 goto tx_err;
1000 md = ip_tunnel_info_opts(tun_info);
1001
1002 tun_id = tunnel_id_to_key32(key->tun_id);
1003 if (md->version == 1) {
1004 erspan_build_header(skb,
1005 ntohl(tun_id),
1006 ntohl(md->u.index), truncate,
1007 false);
1008 } else if (md->version == 2) {
1009 erspan_build_header_v2(skb,
1010 ntohl(tun_id),
1011 md->u.md2.dir,
1012 get_hwid(&md->u.md2),
1013 truncate, false);
1014 } else {
1015 goto tx_err;
1016 }
1017 } else {
1018 switch (skb->protocol) {
1019 case htons(ETH_P_IP):
1020 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1021 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
1022 &dsfield, &encap_limit);
1023 break;
1024 case htons(ETH_P_IPV6):
1025 if (ipv6_addr_equal(&t->parms.raddr, &ipv6_hdr(skb)->saddr))
1026 goto tx_err;
1027 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
1028 &dsfield, &encap_limit))
1029 goto tx_err;
1030 break;
1031 default:
1032 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1033 break;
1034 }
1035
1036 if (t->parms.erspan_ver == 1)
1037 erspan_build_header(skb, ntohl(t->parms.o_key),
1038 t->parms.index,
1039 truncate, false);
1040 else if (t->parms.erspan_ver == 2)
1041 erspan_build_header_v2(skb, ntohl(t->parms.o_key),
1042 t->parms.dir,
1043 t->parms.hwid,
1044 truncate, false);
1045 else
1046 goto tx_err;
1047
1048 fl6.daddr = t->parms.raddr;
1049 }
1050
1051 /* Push GRE header. */
1052 proto = (t->parms.erspan_ver == 1) ? htons(ETH_P_ERSPAN)
1053 : htons(ETH_P_ERSPAN2);
1054 gre_build_header(skb, 8, TUNNEL_SEQ, proto, 0, htonl(t->o_seqno++));
1055
1056 /* TooBig packet may have updated dst->dev's mtu */
1057 if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu)
1058 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu, false);
1059
1060 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1061 NEXTHDR_GRE);
1062 if (err != 0) {
1063 /* XXX: send ICMP error even if DF is not set. */
1064 if (err == -EMSGSIZE) {
1065 if (skb->protocol == htons(ETH_P_IP))
1066 icmp_send(skb, ICMP_DEST_UNREACH,
1067 ICMP_FRAG_NEEDED, htonl(mtu));
1068 else
1069 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1070 }
1071
1072 goto tx_err;
1073 }
1074 return NETDEV_TX_OK;
1075
1076 tx_err:
1077 stats = &t->dev->stats;
1078 if (!IS_ERR(tun_info))
1079 stats->tx_errors++;
1080 stats->tx_dropped++;
1081 kfree_skb(skb);
1082 return NETDEV_TX_OK;
1083 }
1084
1085 static void ip6gre_tnl_link_config_common(struct ip6_tnl *t)
1086 {
1087 struct net_device *dev = t->dev;
1088 struct __ip6_tnl_parm *p = &t->parms;
1089 struct flowi6 *fl6 = &t->fl.u.ip6;
1090
1091 if (dev->type != ARPHRD_ETHER) {
1092 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1093 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1094 }
1095
1096 /* Set up flowi template */
1097 fl6->saddr = p->laddr;
1098 fl6->daddr = p->raddr;
1099 fl6->flowi6_oif = p->link;
1100 fl6->flowlabel = 0;
1101 fl6->flowi6_proto = IPPROTO_GRE;
1102
1103 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1104 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1105 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1106 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1107
1108 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1109 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1110
1111 if (p->flags&IP6_TNL_F_CAP_XMIT &&
1112 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1113 dev->flags |= IFF_POINTOPOINT;
1114 else
1115 dev->flags &= ~IFF_POINTOPOINT;
1116 }
1117
1118 static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu,
1119 int t_hlen)
1120 {
1121 const struct __ip6_tnl_parm *p = &t->parms;
1122 struct net_device *dev = t->dev;
1123
1124 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1125 int strict = (ipv6_addr_type(&p->raddr) &
1126 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1127
1128 struct rt6_info *rt = rt6_lookup(t->net,
1129 &p->raddr, &p->laddr,
1130 p->link, NULL, strict);
1131
1132 if (!rt)
1133 return;
1134
1135 if (rt->dst.dev) {
1136 unsigned short dst_len = rt->dst.dev->hard_header_len +
1137 t_hlen;
1138
1139 if (t->dev->header_ops)
1140 dev->hard_header_len = dst_len;
1141 else
1142 dev->needed_headroom = dst_len;
1143
1144 if (set_mtu) {
1145 dev->mtu = rt->dst.dev->mtu - t_hlen;
1146 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1147 dev->mtu -= 8;
1148 if (dev->type == ARPHRD_ETHER)
1149 dev->mtu -= ETH_HLEN;
1150
1151 if (dev->mtu < IPV6_MIN_MTU)
1152 dev->mtu = IPV6_MIN_MTU;
1153 }
1154 }
1155 ip6_rt_put(rt);
1156 }
1157 }
1158
1159 static int ip6gre_calc_hlen(struct ip6_tnl *tunnel)
1160 {
1161 int t_hlen;
1162
1163 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1164 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1165
1166 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1167
1168 if (tunnel->dev->header_ops)
1169 tunnel->dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1170 else
1171 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1172
1173 return t_hlen;
1174 }
1175
1176 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1177 {
1178 ip6gre_tnl_link_config_common(t);
1179 ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t));
1180 }
1181
1182 static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t,
1183 const struct __ip6_tnl_parm *p)
1184 {
1185 t->parms.laddr = p->laddr;
1186 t->parms.raddr = p->raddr;
1187 t->parms.flags = p->flags;
1188 t->parms.hop_limit = p->hop_limit;
1189 t->parms.encap_limit = p->encap_limit;
1190 t->parms.flowinfo = p->flowinfo;
1191 t->parms.link = p->link;
1192 t->parms.proto = p->proto;
1193 t->parms.i_key = p->i_key;
1194 t->parms.o_key = p->o_key;
1195 t->parms.i_flags = p->i_flags;
1196 t->parms.o_flags = p->o_flags;
1197 t->parms.fwmark = p->fwmark;
1198 t->parms.erspan_ver = p->erspan_ver;
1199 t->parms.index = p->index;
1200 t->parms.dir = p->dir;
1201 t->parms.hwid = p->hwid;
1202 dst_cache_reset(&t->dst_cache);
1203 }
1204
1205 static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
1206 int set_mtu)
1207 {
1208 ip6gre_tnl_copy_tnl_parm(t, p);
1209 ip6gre_tnl_link_config(t, set_mtu);
1210 return 0;
1211 }
1212
1213 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1214 const struct ip6_tnl_parm2 *u)
1215 {
1216 p->laddr = u->laddr;
1217 p->raddr = u->raddr;
1218 p->flags = u->flags;
1219 p->hop_limit = u->hop_limit;
1220 p->encap_limit = u->encap_limit;
1221 p->flowinfo = u->flowinfo;
1222 p->link = u->link;
1223 p->i_key = u->i_key;
1224 p->o_key = u->o_key;
1225 p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
1226 p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
1227 memcpy(p->name, u->name, sizeof(u->name));
1228 }
1229
1230 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1231 const struct __ip6_tnl_parm *p)
1232 {
1233 u->proto = IPPROTO_GRE;
1234 u->laddr = p->laddr;
1235 u->raddr = p->raddr;
1236 u->flags = p->flags;
1237 u->hop_limit = p->hop_limit;
1238 u->encap_limit = p->encap_limit;
1239 u->flowinfo = p->flowinfo;
1240 u->link = p->link;
1241 u->i_key = p->i_key;
1242 u->o_key = p->o_key;
1243 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1244 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
1245 memcpy(u->name, p->name, sizeof(u->name));
1246 }
1247
1248 static int ip6gre_tunnel_ioctl(struct net_device *dev,
1249 struct ifreq *ifr, int cmd)
1250 {
1251 int err = 0;
1252 struct ip6_tnl_parm2 p;
1253 struct __ip6_tnl_parm p1;
1254 struct ip6_tnl *t = netdev_priv(dev);
1255 struct net *net = t->net;
1256 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1257
1258 memset(&p1, 0, sizeof(p1));
1259
1260 switch (cmd) {
1261 case SIOCGETTUNNEL:
1262 if (dev == ign->fb_tunnel_dev) {
1263 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1264 err = -EFAULT;
1265 break;
1266 }
1267 ip6gre_tnl_parm_from_user(&p1, &p);
1268 t = ip6gre_tunnel_locate(net, &p1, 0);
1269 if (!t)
1270 t = netdev_priv(dev);
1271 }
1272 memset(&p, 0, sizeof(p));
1273 ip6gre_tnl_parm_to_user(&p, &t->parms);
1274 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1275 err = -EFAULT;
1276 break;
1277
1278 case SIOCADDTUNNEL:
1279 case SIOCCHGTUNNEL:
1280 err = -EPERM;
1281 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1282 goto done;
1283
1284 err = -EFAULT;
1285 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1286 goto done;
1287
1288 err = -EINVAL;
1289 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1290 goto done;
1291
1292 if (!(p.i_flags&GRE_KEY))
1293 p.i_key = 0;
1294 if (!(p.o_flags&GRE_KEY))
1295 p.o_key = 0;
1296
1297 ip6gre_tnl_parm_from_user(&p1, &p);
1298 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1299
1300 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1301 if (t) {
1302 if (t->dev != dev) {
1303 err = -EEXIST;
1304 break;
1305 }
1306 } else {
1307 t = netdev_priv(dev);
1308
1309 ip6gre_tunnel_unlink(ign, t);
1310 synchronize_net();
1311 ip6gre_tnl_change(t, &p1, 1);
1312 ip6gre_tunnel_link(ign, t);
1313 netdev_state_change(dev);
1314 }
1315 }
1316
1317 if (t) {
1318 err = 0;
1319
1320 memset(&p, 0, sizeof(p));
1321 ip6gre_tnl_parm_to_user(&p, &t->parms);
1322 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1323 err = -EFAULT;
1324 } else
1325 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1326 break;
1327
1328 case SIOCDELTUNNEL:
1329 err = -EPERM;
1330 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1331 goto done;
1332
1333 if (dev == ign->fb_tunnel_dev) {
1334 err = -EFAULT;
1335 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1336 goto done;
1337 err = -ENOENT;
1338 ip6gre_tnl_parm_from_user(&p1, &p);
1339 t = ip6gre_tunnel_locate(net, &p1, 0);
1340 if (!t)
1341 goto done;
1342 err = -EPERM;
1343 if (t == netdev_priv(ign->fb_tunnel_dev))
1344 goto done;
1345 dev = t->dev;
1346 }
1347 unregister_netdevice(dev);
1348 err = 0;
1349 break;
1350
1351 default:
1352 err = -EINVAL;
1353 }
1354
1355 done:
1356 return err;
1357 }
1358
1359 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1360 unsigned short type, const void *daddr,
1361 const void *saddr, unsigned int len)
1362 {
1363 struct ip6_tnl *t = netdev_priv(dev);
1364 struct ipv6hdr *ipv6h;
1365 __be16 *p;
1366
1367 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
1368 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1369 t->fl.u.ip6.flowlabel,
1370 true, &t->fl.u.ip6));
1371 ipv6h->hop_limit = t->parms.hop_limit;
1372 ipv6h->nexthdr = NEXTHDR_GRE;
1373 ipv6h->saddr = t->parms.laddr;
1374 ipv6h->daddr = t->parms.raddr;
1375
1376 p = (__be16 *)(ipv6h + 1);
1377 p[0] = t->parms.o_flags;
1378 p[1] = htons(type);
1379
1380 /*
1381 * Set the source hardware address.
1382 */
1383
1384 if (saddr)
1385 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1386 if (daddr)
1387 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1388 if (!ipv6_addr_any(&ipv6h->daddr))
1389 return t->hlen;
1390
1391 return -t->hlen;
1392 }
1393
1394 static const struct header_ops ip6gre_header_ops = {
1395 .create = ip6gre_header,
1396 };
1397
1398 static const struct net_device_ops ip6gre_netdev_ops = {
1399 .ndo_init = ip6gre_tunnel_init,
1400 .ndo_uninit = ip6gre_tunnel_uninit,
1401 .ndo_start_xmit = ip6gre_tunnel_xmit,
1402 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
1403 .ndo_change_mtu = ip6_tnl_change_mtu,
1404 .ndo_get_stats64 = dev_get_tstats64,
1405 .ndo_get_iflink = ip6_tnl_get_iflink,
1406 };
1407
1408 static void ip6gre_dev_free(struct net_device *dev)
1409 {
1410 struct ip6_tnl *t = netdev_priv(dev);
1411
1412 gro_cells_destroy(&t->gro_cells);
1413 dst_cache_destroy(&t->dst_cache);
1414 free_percpu(dev->tstats);
1415 }
1416
1417 static void ip6gre_tunnel_setup(struct net_device *dev)
1418 {
1419 dev->netdev_ops = &ip6gre_netdev_ops;
1420 dev->needs_free_netdev = true;
1421 dev->priv_destructor = ip6gre_dev_free;
1422
1423 dev->type = ARPHRD_IP6GRE;
1424
1425 dev->flags |= IFF_NOARP;
1426 dev->addr_len = sizeof(struct in6_addr);
1427 netif_keep_dst(dev);
1428 /* This perm addr will be used as interface identifier by IPv6 */
1429 dev->addr_assign_type = NET_ADDR_RANDOM;
1430 eth_random_addr(dev->perm_addr);
1431 }
1432
1433 #define GRE6_FEATURES (NETIF_F_SG | \
1434 NETIF_F_FRAGLIST | \
1435 NETIF_F_HIGHDMA | \
1436 NETIF_F_HW_CSUM)
1437
1438 static void ip6gre_tnl_init_features(struct net_device *dev)
1439 {
1440 struct ip6_tnl *nt = netdev_priv(dev);
1441
1442 dev->features |= GRE6_FEATURES;
1443 dev->hw_features |= GRE6_FEATURES;
1444
1445 if (!(nt->parms.o_flags & TUNNEL_SEQ)) {
1446 /* TCP offload with GRE SEQ is not supported, nor
1447 * can we support 2 levels of outer headers requiring
1448 * an update.
1449 */
1450 if (!(nt->parms.o_flags & TUNNEL_CSUM) ||
1451 nt->encap.type == TUNNEL_ENCAP_NONE) {
1452 dev->features |= NETIF_F_GSO_SOFTWARE;
1453 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1454 }
1455
1456 /* Can use a lockless transmit, unless we generate
1457 * output sequences
1458 */
1459 dev->features |= NETIF_F_LLTX;
1460 }
1461 }
1462
1463 static int ip6gre_tunnel_init_common(struct net_device *dev)
1464 {
1465 struct ip6_tnl *tunnel;
1466 int ret;
1467 int t_hlen;
1468
1469 tunnel = netdev_priv(dev);
1470
1471 tunnel->dev = dev;
1472 tunnel->net = dev_net(dev);
1473 strcpy(tunnel->parms.name, dev->name);
1474
1475 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1476 if (!dev->tstats)
1477 return -ENOMEM;
1478
1479 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1480 if (ret)
1481 goto cleanup_alloc_pcpu_stats;
1482
1483 ret = gro_cells_init(&tunnel->gro_cells, dev);
1484 if (ret)
1485 goto cleanup_dst_cache_init;
1486
1487 t_hlen = ip6gre_calc_hlen(tunnel);
1488 dev->mtu = ETH_DATA_LEN - t_hlen;
1489 if (dev->type == ARPHRD_ETHER)
1490 dev->mtu -= ETH_HLEN;
1491 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1492 dev->mtu -= 8;
1493
1494 if (tunnel->parms.collect_md) {
1495 netif_keep_dst(dev);
1496 }
1497 ip6gre_tnl_init_features(dev);
1498
1499 return 0;
1500
1501 cleanup_dst_cache_init:
1502 dst_cache_destroy(&tunnel->dst_cache);
1503 cleanup_alloc_pcpu_stats:
1504 free_percpu(dev->tstats);
1505 dev->tstats = NULL;
1506 return ret;
1507 }
1508
1509 static int ip6gre_tunnel_init(struct net_device *dev)
1510 {
1511 struct ip6_tnl *tunnel;
1512 int ret;
1513
1514 ret = ip6gre_tunnel_init_common(dev);
1515 if (ret)
1516 return ret;
1517
1518 tunnel = netdev_priv(dev);
1519
1520 if (tunnel->parms.collect_md)
1521 return 0;
1522
1523 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1524 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1525
1526 if (ipv6_addr_any(&tunnel->parms.raddr))
1527 dev->header_ops = &ip6gre_header_ops;
1528
1529 return 0;
1530 }
1531
1532 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1533 {
1534 struct ip6_tnl *tunnel = netdev_priv(dev);
1535
1536 tunnel->dev = dev;
1537 tunnel->net = dev_net(dev);
1538 strcpy(tunnel->parms.name, dev->name);
1539
1540 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1541
1542 dev_hold(dev);
1543 }
1544
1545 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1546 .handler = gre_rcv,
1547 .err_handler = ip6gre_err,
1548 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1549 };
1550
1551 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1552 {
1553 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1554 struct net_device *dev, *aux;
1555 int prio;
1556
1557 for_each_netdev_safe(net, dev, aux)
1558 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1559 dev->rtnl_link_ops == &ip6gre_tap_ops ||
1560 dev->rtnl_link_ops == &ip6erspan_tap_ops)
1561 unregister_netdevice_queue(dev, head);
1562
1563 for (prio = 0; prio < 4; prio++) {
1564 int h;
1565 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1566 struct ip6_tnl *t;
1567
1568 t = rtnl_dereference(ign->tunnels[prio][h]);
1569
1570 while (t) {
1571 /* If dev is in the same netns, it has already
1572 * been added to the list by the previous loop.
1573 */
1574 if (!net_eq(dev_net(t->dev), net))
1575 unregister_netdevice_queue(t->dev,
1576 head);
1577 t = rtnl_dereference(t->next);
1578 }
1579 }
1580 }
1581 }
1582
1583 static int __net_init ip6gre_init_net(struct net *net)
1584 {
1585 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1586 struct net_device *ndev;
1587 int err;
1588
1589 if (!net_has_fallback_tunnels(net))
1590 return 0;
1591 ndev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1592 NET_NAME_UNKNOWN, ip6gre_tunnel_setup);
1593 if (!ndev) {
1594 err = -ENOMEM;
1595 goto err_alloc_dev;
1596 }
1597 ign->fb_tunnel_dev = ndev;
1598 dev_net_set(ign->fb_tunnel_dev, net);
1599 /* FB netdevice is special: we have one, and only one per netns.
1600 * Allowing to move it to another netns is clearly unsafe.
1601 */
1602 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1603
1604
1605 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1606 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1607
1608 err = register_netdev(ign->fb_tunnel_dev);
1609 if (err)
1610 goto err_reg_dev;
1611
1612 rcu_assign_pointer(ign->tunnels_wc[0],
1613 netdev_priv(ign->fb_tunnel_dev));
1614 return 0;
1615
1616 err_reg_dev:
1617 free_netdev(ndev);
1618 err_alloc_dev:
1619 return err;
1620 }
1621
1622 static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list)
1623 {
1624 struct net *net;
1625 LIST_HEAD(list);
1626
1627 rtnl_lock();
1628 list_for_each_entry(net, net_list, exit_list)
1629 ip6gre_destroy_tunnels(net, &list);
1630 unregister_netdevice_many(&list);
1631 rtnl_unlock();
1632 }
1633
1634 static struct pernet_operations ip6gre_net_ops = {
1635 .init = ip6gre_init_net,
1636 .exit_batch = ip6gre_exit_batch_net,
1637 .id = &ip6gre_net_id,
1638 .size = sizeof(struct ip6gre_net),
1639 };
1640
1641 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1642 struct netlink_ext_ack *extack)
1643 {
1644 __be16 flags;
1645
1646 if (!data)
1647 return 0;
1648
1649 flags = 0;
1650 if (data[IFLA_GRE_IFLAGS])
1651 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1652 if (data[IFLA_GRE_OFLAGS])
1653 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1654 if (flags & (GRE_VERSION|GRE_ROUTING))
1655 return -EINVAL;
1656
1657 return 0;
1658 }
1659
1660 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1661 struct netlink_ext_ack *extack)
1662 {
1663 struct in6_addr daddr;
1664
1665 if (tb[IFLA_ADDRESS]) {
1666 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1667 return -EINVAL;
1668 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1669 return -EADDRNOTAVAIL;
1670 }
1671
1672 if (!data)
1673 goto out;
1674
1675 if (data[IFLA_GRE_REMOTE]) {
1676 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1677 if (ipv6_addr_any(&daddr))
1678 return -EINVAL;
1679 }
1680
1681 out:
1682 return ip6gre_tunnel_validate(tb, data, extack);
1683 }
1684
1685 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1686 struct netlink_ext_ack *extack)
1687 {
1688 __be16 flags = 0;
1689 int ret, ver = 0;
1690
1691 if (!data)
1692 return 0;
1693
1694 ret = ip6gre_tap_validate(tb, data, extack);
1695 if (ret)
1696 return ret;
1697
1698 /* ERSPAN should only have GRE sequence and key flag */
1699 if (data[IFLA_GRE_OFLAGS])
1700 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1701 if (data[IFLA_GRE_IFLAGS])
1702 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1703 if (!data[IFLA_GRE_COLLECT_METADATA] &&
1704 flags != (GRE_SEQ | GRE_KEY))
1705 return -EINVAL;
1706
1707 /* ERSPAN Session ID only has 10-bit. Since we reuse
1708 * 32-bit key field as ID, check it's range.
1709 */
1710 if (data[IFLA_GRE_IKEY] &&
1711 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1712 return -EINVAL;
1713
1714 if (data[IFLA_GRE_OKEY] &&
1715 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1716 return -EINVAL;
1717
1718 if (data[IFLA_GRE_ERSPAN_VER]) {
1719 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1720 if (ver != 1 && ver != 2)
1721 return -EINVAL;
1722 }
1723
1724 if (ver == 1) {
1725 if (data[IFLA_GRE_ERSPAN_INDEX]) {
1726 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1727
1728 if (index & ~INDEX_MASK)
1729 return -EINVAL;
1730 }
1731 } else if (ver == 2) {
1732 if (data[IFLA_GRE_ERSPAN_DIR]) {
1733 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1734
1735 if (dir & ~(DIR_MASK >> DIR_OFFSET))
1736 return -EINVAL;
1737 }
1738
1739 if (data[IFLA_GRE_ERSPAN_HWID]) {
1740 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1741
1742 if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1743 return -EINVAL;
1744 }
1745 }
1746
1747 return 0;
1748 }
1749
1750 static void ip6erspan_set_version(struct nlattr *data[],
1751 struct __ip6_tnl_parm *parms)
1752 {
1753 if (!data)
1754 return;
1755
1756 parms->erspan_ver = 1;
1757 if (data[IFLA_GRE_ERSPAN_VER])
1758 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1759
1760 if (parms->erspan_ver == 1) {
1761 if (data[IFLA_GRE_ERSPAN_INDEX])
1762 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1763 } else if (parms->erspan_ver == 2) {
1764 if (data[IFLA_GRE_ERSPAN_DIR])
1765 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1766 if (data[IFLA_GRE_ERSPAN_HWID])
1767 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1768 }
1769 }
1770
1771 static void ip6gre_netlink_parms(struct nlattr *data[],
1772 struct __ip6_tnl_parm *parms)
1773 {
1774 memset(parms, 0, sizeof(*parms));
1775
1776 if (!data)
1777 return;
1778
1779 if (data[IFLA_GRE_LINK])
1780 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1781
1782 if (data[IFLA_GRE_IFLAGS])
1783 parms->i_flags = gre_flags_to_tnl_flags(
1784 nla_get_be16(data[IFLA_GRE_IFLAGS]));
1785
1786 if (data[IFLA_GRE_OFLAGS])
1787 parms->o_flags = gre_flags_to_tnl_flags(
1788 nla_get_be16(data[IFLA_GRE_OFLAGS]));
1789
1790 if (data[IFLA_GRE_IKEY])
1791 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1792
1793 if (data[IFLA_GRE_OKEY])
1794 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1795
1796 if (data[IFLA_GRE_LOCAL])
1797 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1798
1799 if (data[IFLA_GRE_REMOTE])
1800 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1801
1802 if (data[IFLA_GRE_TTL])
1803 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1804
1805 if (data[IFLA_GRE_ENCAP_LIMIT])
1806 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1807
1808 if (data[IFLA_GRE_FLOWINFO])
1809 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1810
1811 if (data[IFLA_GRE_FLAGS])
1812 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1813
1814 if (data[IFLA_GRE_FWMARK])
1815 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1816
1817 if (data[IFLA_GRE_COLLECT_METADATA])
1818 parms->collect_md = true;
1819 }
1820
1821 static int ip6gre_tap_init(struct net_device *dev)
1822 {
1823 int ret;
1824
1825 ret = ip6gre_tunnel_init_common(dev);
1826 if (ret)
1827 return ret;
1828
1829 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1830
1831 return 0;
1832 }
1833
1834 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1835 .ndo_init = ip6gre_tap_init,
1836 .ndo_uninit = ip6gre_tunnel_uninit,
1837 .ndo_start_xmit = ip6gre_tunnel_xmit,
1838 .ndo_set_mac_address = eth_mac_addr,
1839 .ndo_validate_addr = eth_validate_addr,
1840 .ndo_change_mtu = ip6_tnl_change_mtu,
1841 .ndo_get_stats64 = dev_get_tstats64,
1842 .ndo_get_iflink = ip6_tnl_get_iflink,
1843 };
1844
1845 static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel)
1846 {
1847 int t_hlen;
1848
1849 tunnel->tun_hlen = 8;
1850 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1851 erspan_hdr_len(tunnel->parms.erspan_ver);
1852
1853 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1854 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1855 return t_hlen;
1856 }
1857
1858 static int ip6erspan_tap_init(struct net_device *dev)
1859 {
1860 struct ip6_tnl *tunnel;
1861 int t_hlen;
1862 int ret;
1863
1864 tunnel = netdev_priv(dev);
1865
1866 tunnel->dev = dev;
1867 tunnel->net = dev_net(dev);
1868 strcpy(tunnel->parms.name, dev->name);
1869
1870 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1871 if (!dev->tstats)
1872 return -ENOMEM;
1873
1874 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1875 if (ret)
1876 goto cleanup_alloc_pcpu_stats;
1877
1878 ret = gro_cells_init(&tunnel->gro_cells, dev);
1879 if (ret)
1880 goto cleanup_dst_cache_init;
1881
1882 t_hlen = ip6erspan_calc_hlen(tunnel);
1883 dev->mtu = ETH_DATA_LEN - t_hlen;
1884 if (dev->type == ARPHRD_ETHER)
1885 dev->mtu -= ETH_HLEN;
1886 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1887 dev->mtu -= 8;
1888
1889 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1890 ip6erspan_tnl_link_config(tunnel, 1);
1891
1892 return 0;
1893
1894 cleanup_dst_cache_init:
1895 dst_cache_destroy(&tunnel->dst_cache);
1896 cleanup_alloc_pcpu_stats:
1897 free_percpu(dev->tstats);
1898 dev->tstats = NULL;
1899 return ret;
1900 }
1901
1902 static const struct net_device_ops ip6erspan_netdev_ops = {
1903 .ndo_init = ip6erspan_tap_init,
1904 .ndo_uninit = ip6erspan_tunnel_uninit,
1905 .ndo_start_xmit = ip6erspan_tunnel_xmit,
1906 .ndo_set_mac_address = eth_mac_addr,
1907 .ndo_validate_addr = eth_validate_addr,
1908 .ndo_change_mtu = ip6_tnl_change_mtu,
1909 .ndo_get_stats64 = dev_get_tstats64,
1910 .ndo_get_iflink = ip6_tnl_get_iflink,
1911 };
1912
1913 static void ip6gre_tap_setup(struct net_device *dev)
1914 {
1915
1916 ether_setup(dev);
1917
1918 dev->max_mtu = 0;
1919 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1920 dev->needs_free_netdev = true;
1921 dev->priv_destructor = ip6gre_dev_free;
1922
1923 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1924 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1925 netif_keep_dst(dev);
1926 }
1927
1928 static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1929 struct ip_tunnel_encap *ipencap)
1930 {
1931 bool ret = false;
1932
1933 memset(ipencap, 0, sizeof(*ipencap));
1934
1935 if (!data)
1936 return ret;
1937
1938 if (data[IFLA_GRE_ENCAP_TYPE]) {
1939 ret = true;
1940 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1941 }
1942
1943 if (data[IFLA_GRE_ENCAP_FLAGS]) {
1944 ret = true;
1945 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1946 }
1947
1948 if (data[IFLA_GRE_ENCAP_SPORT]) {
1949 ret = true;
1950 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1951 }
1952
1953 if (data[IFLA_GRE_ENCAP_DPORT]) {
1954 ret = true;
1955 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1956 }
1957
1958 return ret;
1959 }
1960
1961 static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev,
1962 struct nlattr *tb[], struct nlattr *data[],
1963 struct netlink_ext_ack *extack)
1964 {
1965 struct ip6_tnl *nt;
1966 struct ip_tunnel_encap ipencap;
1967 int err;
1968
1969 nt = netdev_priv(dev);
1970
1971 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1972 int err = ip6_tnl_encap_setup(nt, &ipencap);
1973
1974 if (err < 0)
1975 return err;
1976 }
1977
1978 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1979 eth_hw_addr_random(dev);
1980
1981 nt->dev = dev;
1982 nt->net = dev_net(dev);
1983
1984 err = register_netdevice(dev);
1985 if (err)
1986 goto out;
1987
1988 if (tb[IFLA_MTU])
1989 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1990
1991 dev_hold(dev);
1992
1993 out:
1994 return err;
1995 }
1996
1997 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1998 struct nlattr *tb[], struct nlattr *data[],
1999 struct netlink_ext_ack *extack)
2000 {
2001 struct ip6_tnl *nt = netdev_priv(dev);
2002 struct net *net = dev_net(dev);
2003 struct ip6gre_net *ign;
2004 int err;
2005
2006 ip6gre_netlink_parms(data, &nt->parms);
2007 ign = net_generic(net, ip6gre_net_id);
2008
2009 if (nt->parms.collect_md) {
2010 if (rtnl_dereference(ign->collect_md_tun))
2011 return -EEXIST;
2012 } else {
2013 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2014 return -EEXIST;
2015 }
2016
2017 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2018 if (!err) {
2019 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
2020 ip6gre_tunnel_link_md(ign, nt);
2021 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2022 }
2023 return err;
2024 }
2025
2026 static struct ip6_tnl *
2027 ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[],
2028 struct nlattr *data[], struct __ip6_tnl_parm *p_p,
2029 struct netlink_ext_ack *extack)
2030 {
2031 struct ip6_tnl *t, *nt = netdev_priv(dev);
2032 struct net *net = nt->net;
2033 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2034 struct ip_tunnel_encap ipencap;
2035
2036 if (dev == ign->fb_tunnel_dev)
2037 return ERR_PTR(-EINVAL);
2038
2039 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
2040 int err = ip6_tnl_encap_setup(nt, &ipencap);
2041
2042 if (err < 0)
2043 return ERR_PTR(err);
2044 }
2045
2046 ip6gre_netlink_parms(data, p_p);
2047
2048 t = ip6gre_tunnel_locate(net, p_p, 0);
2049
2050 if (t) {
2051 if (t->dev != dev)
2052 return ERR_PTR(-EEXIST);
2053 } else {
2054 t = nt;
2055 }
2056
2057 return t;
2058 }
2059
2060 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
2061 struct nlattr *data[],
2062 struct netlink_ext_ack *extack)
2063 {
2064 struct ip6_tnl *t = netdev_priv(dev);
2065 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
2066 struct __ip6_tnl_parm p;
2067
2068 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2069 if (IS_ERR(t))
2070 return PTR_ERR(t);
2071
2072 ip6gre_tunnel_unlink_md(ign, t);
2073 ip6gre_tunnel_unlink(ign, t);
2074 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
2075 ip6gre_tunnel_link_md(ign, t);
2076 ip6gre_tunnel_link(ign, t);
2077 return 0;
2078 }
2079
2080 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
2081 {
2082 struct net *net = dev_net(dev);
2083 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2084
2085 if (dev != ign->fb_tunnel_dev)
2086 unregister_netdevice_queue(dev, head);
2087 }
2088
2089 static size_t ip6gre_get_size(const struct net_device *dev)
2090 {
2091 return
2092 /* IFLA_GRE_LINK */
2093 nla_total_size(4) +
2094 /* IFLA_GRE_IFLAGS */
2095 nla_total_size(2) +
2096 /* IFLA_GRE_OFLAGS */
2097 nla_total_size(2) +
2098 /* IFLA_GRE_IKEY */
2099 nla_total_size(4) +
2100 /* IFLA_GRE_OKEY */
2101 nla_total_size(4) +
2102 /* IFLA_GRE_LOCAL */
2103 nla_total_size(sizeof(struct in6_addr)) +
2104 /* IFLA_GRE_REMOTE */
2105 nla_total_size(sizeof(struct in6_addr)) +
2106 /* IFLA_GRE_TTL */
2107 nla_total_size(1) +
2108 /* IFLA_GRE_ENCAP_LIMIT */
2109 nla_total_size(1) +
2110 /* IFLA_GRE_FLOWINFO */
2111 nla_total_size(4) +
2112 /* IFLA_GRE_FLAGS */
2113 nla_total_size(4) +
2114 /* IFLA_GRE_ENCAP_TYPE */
2115 nla_total_size(2) +
2116 /* IFLA_GRE_ENCAP_FLAGS */
2117 nla_total_size(2) +
2118 /* IFLA_GRE_ENCAP_SPORT */
2119 nla_total_size(2) +
2120 /* IFLA_GRE_ENCAP_DPORT */
2121 nla_total_size(2) +
2122 /* IFLA_GRE_COLLECT_METADATA */
2123 nla_total_size(0) +
2124 /* IFLA_GRE_FWMARK */
2125 nla_total_size(4) +
2126 /* IFLA_GRE_ERSPAN_INDEX */
2127 nla_total_size(4) +
2128 0;
2129 }
2130
2131 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
2132 {
2133 struct ip6_tnl *t = netdev_priv(dev);
2134 struct __ip6_tnl_parm *p = &t->parms;
2135 __be16 o_flags = p->o_flags;
2136
2137 if (p->erspan_ver == 1 || p->erspan_ver == 2) {
2138 if (!p->collect_md)
2139 o_flags |= TUNNEL_KEY;
2140
2141 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
2142 goto nla_put_failure;
2143
2144 if (p->erspan_ver == 1) {
2145 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2146 goto nla_put_failure;
2147 } else {
2148 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
2149 goto nla_put_failure;
2150 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
2151 goto nla_put_failure;
2152 }
2153 }
2154
2155 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
2156 nla_put_be16(skb, IFLA_GRE_IFLAGS,
2157 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
2158 nla_put_be16(skb, IFLA_GRE_OFLAGS,
2159 gre_tnl_flags_to_gre_flags(o_flags)) ||
2160 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
2161 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
2162 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
2163 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
2164 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
2165 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
2166 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
2167 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
2168 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark))
2169 goto nla_put_failure;
2170
2171 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
2172 t->encap.type) ||
2173 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
2174 t->encap.sport) ||
2175 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
2176 t->encap.dport) ||
2177 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
2178 t->encap.flags))
2179 goto nla_put_failure;
2180
2181 if (p->collect_md) {
2182 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
2183 goto nla_put_failure;
2184 }
2185
2186 return 0;
2187
2188 nla_put_failure:
2189 return -EMSGSIZE;
2190 }
2191
2192 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
2193 [IFLA_GRE_LINK] = { .type = NLA_U32 },
2194 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
2195 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
2196 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
2197 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
2198 [IFLA_GRE_LOCAL] = { .len = sizeof_field(struct ipv6hdr, saddr) },
2199 [IFLA_GRE_REMOTE] = { .len = sizeof_field(struct ipv6hdr, daddr) },
2200 [IFLA_GRE_TTL] = { .type = NLA_U8 },
2201 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
2202 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
2203 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
2204 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 },
2205 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
2206 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
2207 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
2208 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
2209 [IFLA_GRE_FWMARK] = { .type = NLA_U32 },
2210 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
2211 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 },
2212 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 },
2213 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 },
2214 };
2215
2216 static void ip6erspan_tap_setup(struct net_device *dev)
2217 {
2218 ether_setup(dev);
2219
2220 dev->max_mtu = 0;
2221 dev->netdev_ops = &ip6erspan_netdev_ops;
2222 dev->needs_free_netdev = true;
2223 dev->priv_destructor = ip6gre_dev_free;
2224
2225 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2226 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2227 netif_keep_dst(dev);
2228 }
2229
2230 static int ip6erspan_newlink(struct net *src_net, struct net_device *dev,
2231 struct nlattr *tb[], struct nlattr *data[],
2232 struct netlink_ext_ack *extack)
2233 {
2234 struct ip6_tnl *nt = netdev_priv(dev);
2235 struct net *net = dev_net(dev);
2236 struct ip6gre_net *ign;
2237 int err;
2238
2239 ip6gre_netlink_parms(data, &nt->parms);
2240 ip6erspan_set_version(data, &nt->parms);
2241 ign = net_generic(net, ip6gre_net_id);
2242
2243 if (nt->parms.collect_md) {
2244 if (rtnl_dereference(ign->collect_md_tun_erspan))
2245 return -EEXIST;
2246 } else {
2247 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2248 return -EEXIST;
2249 }
2250
2251 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2252 if (!err) {
2253 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]);
2254 ip6erspan_tunnel_link_md(ign, nt);
2255 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2256 }
2257 return err;
2258 }
2259
2260 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu)
2261 {
2262 ip6gre_tnl_link_config_common(t);
2263 ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t));
2264 }
2265
2266 static int ip6erspan_tnl_change(struct ip6_tnl *t,
2267 const struct __ip6_tnl_parm *p, int set_mtu)
2268 {
2269 ip6gre_tnl_copy_tnl_parm(t, p);
2270 ip6erspan_tnl_link_config(t, set_mtu);
2271 return 0;
2272 }
2273
2274 static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[],
2275 struct nlattr *data[],
2276 struct netlink_ext_ack *extack)
2277 {
2278 struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2279 struct __ip6_tnl_parm p;
2280 struct ip6_tnl *t;
2281
2282 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2283 if (IS_ERR(t))
2284 return PTR_ERR(t);
2285
2286 ip6erspan_set_version(data, &p);
2287 ip6gre_tunnel_unlink_md(ign, t);
2288 ip6gre_tunnel_unlink(ign, t);
2289 ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]);
2290 ip6erspan_tunnel_link_md(ign, t);
2291 ip6gre_tunnel_link(ign, t);
2292 return 0;
2293 }
2294
2295 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
2296 .kind = "ip6gre",
2297 .maxtype = IFLA_GRE_MAX,
2298 .policy = ip6gre_policy,
2299 .priv_size = sizeof(struct ip6_tnl),
2300 .setup = ip6gre_tunnel_setup,
2301 .validate = ip6gre_tunnel_validate,
2302 .newlink = ip6gre_newlink,
2303 .changelink = ip6gre_changelink,
2304 .dellink = ip6gre_dellink,
2305 .get_size = ip6gre_get_size,
2306 .fill_info = ip6gre_fill_info,
2307 .get_link_net = ip6_tnl_get_link_net,
2308 };
2309
2310 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
2311 .kind = "ip6gretap",
2312 .maxtype = IFLA_GRE_MAX,
2313 .policy = ip6gre_policy,
2314 .priv_size = sizeof(struct ip6_tnl),
2315 .setup = ip6gre_tap_setup,
2316 .validate = ip6gre_tap_validate,
2317 .newlink = ip6gre_newlink,
2318 .changelink = ip6gre_changelink,
2319 .get_size = ip6gre_get_size,
2320 .fill_info = ip6gre_fill_info,
2321 .get_link_net = ip6_tnl_get_link_net,
2322 };
2323
2324 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = {
2325 .kind = "ip6erspan",
2326 .maxtype = IFLA_GRE_MAX,
2327 .policy = ip6gre_policy,
2328 .priv_size = sizeof(struct ip6_tnl),
2329 .setup = ip6erspan_tap_setup,
2330 .validate = ip6erspan_tap_validate,
2331 .newlink = ip6erspan_newlink,
2332 .changelink = ip6erspan_changelink,
2333 .get_size = ip6gre_get_size,
2334 .fill_info = ip6gre_fill_info,
2335 .get_link_net = ip6_tnl_get_link_net,
2336 };
2337
2338 /*
2339 * And now the modules code and kernel interface.
2340 */
2341
2342 static int __init ip6gre_init(void)
2343 {
2344 int err;
2345
2346 pr_info("GRE over IPv6 tunneling driver\n");
2347
2348 err = register_pernet_device(&ip6gre_net_ops);
2349 if (err < 0)
2350 return err;
2351
2352 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
2353 if (err < 0) {
2354 pr_info("%s: can't add protocol\n", __func__);
2355 goto add_proto_failed;
2356 }
2357
2358 err = rtnl_link_register(&ip6gre_link_ops);
2359 if (err < 0)
2360 goto rtnl_link_failed;
2361
2362 err = rtnl_link_register(&ip6gre_tap_ops);
2363 if (err < 0)
2364 goto tap_ops_failed;
2365
2366 err = rtnl_link_register(&ip6erspan_tap_ops);
2367 if (err < 0)
2368 goto erspan_link_failed;
2369
2370 out:
2371 return err;
2372
2373 erspan_link_failed:
2374 rtnl_link_unregister(&ip6gre_tap_ops);
2375 tap_ops_failed:
2376 rtnl_link_unregister(&ip6gre_link_ops);
2377 rtnl_link_failed:
2378 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2379 add_proto_failed:
2380 unregister_pernet_device(&ip6gre_net_ops);
2381 goto out;
2382 }
2383
2384 static void __exit ip6gre_fini(void)
2385 {
2386 rtnl_link_unregister(&ip6gre_tap_ops);
2387 rtnl_link_unregister(&ip6gre_link_ops);
2388 rtnl_link_unregister(&ip6erspan_tap_ops);
2389 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2390 unregister_pernet_device(&ip6gre_net_ops);
2391 }
2392
2393 module_init(ip6gre_init);
2394 module_exit(ip6gre_fini);
2395 MODULE_LICENSE("GPL");
2396 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
2397 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
2398 MODULE_ALIAS_RTNL_LINK("ip6gre");
2399 MODULE_ALIAS_RTNL_LINK("ip6gretap");
2400 MODULE_ALIAS_RTNL_LINK("ip6erspan");
2401 MODULE_ALIAS_NETDEV("ip6gre0");
Linux with added FPC-III support