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octeontx2-pf: Fix error return code in otx2_probe()
[linux/fpc-iii.git] / net / ipv6 / ip6_gre.c
blob781ca8c07a0da3619d31f8ddd06c8ae69a7a17eb
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
131 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
132 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
133 !ipv6_addr_equal(remote, &t->parms.raddr) ||
134 key != t->parms.i_key ||
135 !(t->dev->flags & IFF_UP))
136 continue;
137
138 if (t->dev->type != ARPHRD_IP6GRE &&
139 t->dev->type != dev_type)
140 continue;
141
142 score = 0;
143 if (t->parms.link != link)
144 score |= 1;
145 if (t->dev->type != dev_type)
146 score |= 2;
147 if (score == 0)
148 return t;
149
150 if (score < cand_score) {
151 cand = t;
152 cand_score = score;
153 }
154 }
155
156 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
157 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
158 key != t->parms.i_key ||
159 !(t->dev->flags & IFF_UP))
160 continue;
161
162 if (t->dev->type != ARPHRD_IP6GRE &&
163 t->dev->type != dev_type)
164 continue;
165
166 score = 0;
167 if (t->parms.link != link)
168 score |= 1;
169 if (t->dev->type != dev_type)
170 score |= 2;
171 if (score == 0)
172 return t;
173
174 if (score < cand_score) {
175 cand = t;
176 cand_score = score;
177 }
178 }
179
180 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
181 if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
182 (!ipv6_addr_equal(local, &t->parms.raddr) ||
183 !ipv6_addr_is_multicast(local))) ||
184 key != t->parms.i_key ||
185 !(t->dev->flags & IFF_UP))
186 continue;
187
188 if (t->dev->type != ARPHRD_IP6GRE &&
189 t->dev->type != dev_type)
190 continue;
191
192 score = 0;
193 if (t->parms.link != link)
194 score |= 1;
195 if (t->dev->type != dev_type)
196 score |= 2;
197 if (score == 0)
198 return t;
199
200 if (score < cand_score) {
201 cand = t;
202 cand_score = score;
203 }
204 }
205
206 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
207 if (t->parms.i_key != key ||
208 !(t->dev->flags & IFF_UP))
209 continue;
210
211 if (t->dev->type != ARPHRD_IP6GRE &&
212 t->dev->type != dev_type)
213 continue;
214
215 score = 0;
216 if (t->parms.link != link)
217 score |= 1;
218 if (t->dev->type != dev_type)
219 score |= 2;
220 if (score == 0)
221 return t;
222
223 if (score < cand_score) {
224 cand = t;
225 cand_score = score;
226 }
227 }
228
229 if (cand)
230 return cand;
231
232 if (gre_proto == htons(ETH_P_ERSPAN) ||
233 gre_proto == htons(ETH_P_ERSPAN2))
234 t = rcu_dereference(ign->collect_md_tun_erspan);
235 else
236 t = rcu_dereference(ign->collect_md_tun);
237
238 if (t && t->dev->flags & IFF_UP)
239 return t;
240
241 dev = ign->fb_tunnel_dev;
242 if (dev && dev->flags & IFF_UP)
243 return netdev_priv(dev);
244
245 return NULL;
246 }
247
248 static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
249 const struct __ip6_tnl_parm *p)
250 {
251 const struct in6_addr *remote = &p->raddr;
252 const struct in6_addr *local = &p->laddr;
253 unsigned int h = HASH_KEY(p->i_key);
254 int prio = 0;
255
256 if (!ipv6_addr_any(local))
257 prio |= 1;
258 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
259 prio |= 2;
260 h ^= HASH_ADDR(remote);
261 }
262
263 return &ign->tunnels[prio][h];
264 }
265
266 static void ip6gre_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
267 {
268 if (t->parms.collect_md)
269 rcu_assign_pointer(ign->collect_md_tun, t);
270 }
271
272 static void ip6erspan_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
273 {
274 if (t->parms.collect_md)
275 rcu_assign_pointer(ign->collect_md_tun_erspan, t);
276 }
277
278 static void ip6gre_tunnel_unlink_md(struct ip6gre_net *ign, struct ip6_tnl *t)
279 {
280 if (t->parms.collect_md)
281 rcu_assign_pointer(ign->collect_md_tun, NULL);
282 }
283
284 static void ip6erspan_tunnel_unlink_md(struct ip6gre_net *ign,
285 struct ip6_tnl *t)
286 {
287 if (t->parms.collect_md)
288 rcu_assign_pointer(ign->collect_md_tun_erspan, NULL);
289 }
290
291 static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
292 const struct ip6_tnl *t)
293 {
294 return __ip6gre_bucket(ign, &t->parms);
295 }
296
297 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
298 {
299 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
300
301 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
302 rcu_assign_pointer(*tp, t);
303 }
304
305 static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
306 {
307 struct ip6_tnl __rcu **tp;
308 struct ip6_tnl *iter;
309
310 for (tp = ip6gre_bucket(ign, t);
311 (iter = rtnl_dereference(*tp)) != NULL;
312 tp = &iter->next) {
313 if (t == iter) {
314 rcu_assign_pointer(*tp, t->next);
315 break;
316 }
317 }
318 }
319
320 static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
321 const struct __ip6_tnl_parm *parms,
322 int type)
323 {
324 const struct in6_addr *remote = &parms->raddr;
325 const struct in6_addr *local = &parms->laddr;
326 __be32 key = parms->i_key;
327 int link = parms->link;
328 struct ip6_tnl *t;
329 struct ip6_tnl __rcu **tp;
330 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
331
332 for (tp = __ip6gre_bucket(ign, parms);
333 (t = rtnl_dereference(*tp)) != NULL;
334 tp = &t->next)
335 if (ipv6_addr_equal(local, &t->parms.laddr) &&
336 ipv6_addr_equal(remote, &t->parms.raddr) &&
337 key == t->parms.i_key &&
338 link == t->parms.link &&
339 type == t->dev->type)
340 break;
341
342 return t;
343 }
344
345 static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
346 const struct __ip6_tnl_parm *parms, int create)
347 {
348 struct ip6_tnl *t, *nt;
349 struct net_device *dev;
350 char name[IFNAMSIZ];
351 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
352
353 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
354 if (t && create)
355 return NULL;
356 if (t || !create)
357 return t;
358
359 if (parms->name[0]) {
360 if (!dev_valid_name(parms->name))
361 return NULL;
362 strlcpy(name, parms->name, IFNAMSIZ);
363 } else {
364 strcpy(name, "ip6gre%d");
365 }
366 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
367 ip6gre_tunnel_setup);
368 if (!dev)
369 return NULL;
370
371 dev_net_set(dev, net);
372
373 nt = netdev_priv(dev);
374 nt->parms = *parms;
375 dev->rtnl_link_ops = &ip6gre_link_ops;
376
377 nt->dev = dev;
378 nt->net = dev_net(dev);
379
380 if (register_netdevice(dev) < 0)
381 goto failed_free;
382
383 ip6gre_tnl_link_config(nt, 1);
384
385 /* Can use a lockless transmit, unless we generate output sequences */
386 if (!(nt->parms.o_flags & TUNNEL_SEQ))
387 dev->features |= NETIF_F_LLTX;
388
389 dev_hold(dev);
390 ip6gre_tunnel_link(ign, nt);
391 return nt;
392
393 failed_free:
394 free_netdev(dev);
395 return NULL;
396 }
397
398 static void ip6erspan_tunnel_uninit(struct net_device *dev)
399 {
400 struct ip6_tnl *t = netdev_priv(dev);
401 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
402
403 ip6erspan_tunnel_unlink_md(ign, t);
404 ip6gre_tunnel_unlink(ign, t);
405 dst_cache_reset(&t->dst_cache);
406 dev_put(dev);
407 }
408
409 static void ip6gre_tunnel_uninit(struct net_device *dev)
410 {
411 struct ip6_tnl *t = netdev_priv(dev);
412 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
413
414 ip6gre_tunnel_unlink_md(ign, t);
415 ip6gre_tunnel_unlink(ign, t);
416 dst_cache_reset(&t->dst_cache);
417 dev_put(dev);
418 }
419
420
421 static int ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
422 u8 type, u8 code, int offset, __be32 info)
423 {
424 struct net *net = dev_net(skb->dev);
425 const struct ipv6hdr *ipv6h;
426 struct tnl_ptk_info tpi;
427 struct ip6_tnl *t;
428
429 if (gre_parse_header(skb, &tpi, NULL, htons(ETH_P_IPV6),
430 offset) < 0)
431 return -EINVAL;
432
433 ipv6h = (const struct ipv6hdr *)skb->data;
434 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
435 tpi.key, tpi.proto);
436 if (!t)
437 return -ENOENT;
438
439 switch (type) {
440 case ICMPV6_DEST_UNREACH:
441 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
442 t->parms.name);
443 if (code != ICMPV6_PORT_UNREACH)
444 break;
445 return 0;
446 case ICMPV6_TIME_EXCEED:
447 if (code == ICMPV6_EXC_HOPLIMIT) {
448 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
449 t->parms.name);
450 break;
451 }
452 return 0;
453 case ICMPV6_PARAMPROB: {
454 struct ipv6_tlv_tnl_enc_lim *tel;
455 __u32 teli;
456
457 teli = 0;
458 if (code == ICMPV6_HDR_FIELD)
459 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
460
461 if (teli && teli == be32_to_cpu(info) - 2) {
462 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
463 if (tel->encap_limit == 0) {
464 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
465 t->parms.name);
466 }
467 } else {
468 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
469 t->parms.name);
470 }
471 return 0;
472 }
473 case ICMPV6_PKT_TOOBIG:
474 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
475 return 0;
476 case NDISC_REDIRECT:
477 ip6_redirect(skb, net, skb->dev->ifindex, 0,
478 sock_net_uid(net, NULL));
479 return 0;
480 }
481
482 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
483 t->err_count++;
484 else
485 t->err_count = 1;
486 t->err_time = jiffies;
487
488 return 0;
489 }
490
491 static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
492 {
493 const struct ipv6hdr *ipv6h;
494 struct ip6_tnl *tunnel;
495
496 ipv6h = ipv6_hdr(skb);
497 tunnel = ip6gre_tunnel_lookup(skb->dev,
498 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
499 tpi->proto);
500 if (tunnel) {
501 if (tunnel->parms.collect_md) {
502 struct metadata_dst *tun_dst;
503 __be64 tun_id;
504 __be16 flags;
505
506 flags = tpi->flags;
507 tun_id = key32_to_tunnel_id(tpi->key);
508
509 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0);
510 if (!tun_dst)
511 return PACKET_REJECT;
512
513 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
514 } else {
515 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
516 }
517
518 return PACKET_RCVD;
519 }
520
521 return PACKET_REJECT;
522 }
523
524 static int ip6erspan_rcv(struct sk_buff *skb,
525 struct tnl_ptk_info *tpi,
526 int gre_hdr_len)
527 {
528 struct erspan_base_hdr *ershdr;
529 const struct ipv6hdr *ipv6h;
530 struct erspan_md2 *md2;
531 struct ip6_tnl *tunnel;
532 u8 ver;
533
534 ipv6h = ipv6_hdr(skb);
535 ershdr = (struct erspan_base_hdr *)skb->data;
536 ver = ershdr->ver;
537
538 tunnel = ip6gre_tunnel_lookup(skb->dev,
539 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
540 tpi->proto);
541 if (tunnel) {
542 int len = erspan_hdr_len(ver);
543
544 if (unlikely(!pskb_may_pull(skb, len)))
545 return PACKET_REJECT;
546
547 if (__iptunnel_pull_header(skb, len,
548 htons(ETH_P_TEB),
549 false, false) < 0)
550 return PACKET_REJECT;
551
552 if (tunnel->parms.collect_md) {
553 struct erspan_metadata *pkt_md, *md;
554 struct metadata_dst *tun_dst;
555 struct ip_tunnel_info *info;
556 unsigned char *gh;
557 __be64 tun_id;
558 __be16 flags;
559
560 tpi->flags |= TUNNEL_KEY;
561 flags = tpi->flags;
562 tun_id = key32_to_tunnel_id(tpi->key);
563
564 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id,
565 sizeof(*md));
566 if (!tun_dst)
567 return PACKET_REJECT;
568
569 /* skb can be uncloned in __iptunnel_pull_header, so
570 * old pkt_md is no longer valid and we need to reset
571 * it
572 */
573 gh = skb_network_header(skb) +
574 skb_network_header_len(skb);
575 pkt_md = (struct erspan_metadata *)(gh + gre_hdr_len +
576 sizeof(*ershdr));
577 info = &tun_dst->u.tun_info;
578 md = ip_tunnel_info_opts(info);
579 md->version = ver;
580 md2 = &md->u.md2;
581 memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE :
582 ERSPAN_V2_MDSIZE);
583 info->key.tun_flags |= TUNNEL_ERSPAN_OPT;
584 info->options_len = sizeof(*md);
585
586 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
587
588 } else {
589 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
590 }
591
592 return PACKET_RCVD;
593 }
594
595 return PACKET_REJECT;
596 }
597
598 static int gre_rcv(struct sk_buff *skb)
599 {
600 struct tnl_ptk_info tpi;
601 bool csum_err = false;
602 int hdr_len;
603
604 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
605 if (hdr_len < 0)
606 goto drop;
607
608 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
609 goto drop;
610
611 if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) ||
612 tpi.proto == htons(ETH_P_ERSPAN2))) {
613 if (ip6erspan_rcv(skb, &tpi, hdr_len) == PACKET_RCVD)
614 return 0;
615 goto out;
616 }
617
618 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
619 return 0;
620
621 out:
622 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
623 drop:
624 kfree_skb(skb);
625 return 0;
626 }
627
628 static int gre_handle_offloads(struct sk_buff *skb, bool csum)
629 {
630 return iptunnel_handle_offloads(skb,
631 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
632 }
633
634 static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb,
635 struct net_device *dev,
636 struct flowi6 *fl6, __u8 *dsfield,
637 int *encap_limit)
638 {
639 const struct iphdr *iph = ip_hdr(skb);
640 struct ip6_tnl *t = netdev_priv(dev);
641
642 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
643 *encap_limit = t->parms.encap_limit;
644
645 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
646
647 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
648 *dsfield = ipv4_get_dsfield(iph);
649 else
650 *dsfield = ip6_tclass(t->parms.flowinfo);
651
652 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
653 fl6->flowi6_mark = skb->mark;
654 else
655 fl6->flowi6_mark = t->parms.fwmark;
656
657 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
658 }
659
660 static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb,
661 struct net_device *dev,
662 struct flowi6 *fl6, __u8 *dsfield,
663 int *encap_limit)
664 {
665 struct ipv6hdr *ipv6h;
666 struct ip6_tnl *t = netdev_priv(dev);
667 __u16 offset;
668
669 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
670 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
671 ipv6h = ipv6_hdr(skb);
672
673 if (offset > 0) {
674 struct ipv6_tlv_tnl_enc_lim *tel;
675
676 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
677 if (tel->encap_limit == 0) {
678 icmpv6_send(skb, ICMPV6_PARAMPROB,
679 ICMPV6_HDR_FIELD, offset + 2);
680 return -1;
681 }
682 *encap_limit = tel->encap_limit - 1;
683 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
684 *encap_limit = t->parms.encap_limit;
685 }
686
687 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
688
689 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
690 *dsfield = ipv6_get_dsfield(ipv6h);
691 else
692 *dsfield = ip6_tclass(t->parms.flowinfo);
693
694 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
695 fl6->flowlabel |= ip6_flowlabel(ipv6h);
696
697 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
698 fl6->flowi6_mark = skb->mark;
699 else
700 fl6->flowi6_mark = t->parms.fwmark;
701
702 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
703
704 return 0;
705 }
706
707 static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
708 struct net_device *dev, __u8 dsfield,
709 struct flowi6 *fl6, int encap_limit,
710 __u32 *pmtu, __be16 proto)
711 {
712 struct ip6_tnl *tunnel = netdev_priv(dev);
713 __be16 protocol;
714
715 if (dev->type == ARPHRD_ETHER)
716 IPCB(skb)->flags = 0;
717
718 if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
719 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
720 else
721 fl6->daddr = tunnel->parms.raddr;
722
723 if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen))
724 return -ENOMEM;
725
726 /* Push GRE header. */
727 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
728
729 if (tunnel->parms.collect_md) {
730 struct ip_tunnel_info *tun_info;
731 const struct ip_tunnel_key *key;
732 __be16 flags;
733
734 tun_info = skb_tunnel_info(skb);
735 if (unlikely(!tun_info ||
736 !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
737 ip_tunnel_info_af(tun_info) != AF_INET6))
738 return -EINVAL;
739
740 key = &tun_info->key;
741 memset(fl6, 0, sizeof(*fl6));
742 fl6->flowi6_proto = IPPROTO_GRE;
743 fl6->daddr = key->u.ipv6.dst;
744 fl6->flowlabel = key->label;
745 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
746
747 dsfield = key->tos;
748 flags = key->tun_flags &
749 (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ);
750 tunnel->tun_hlen = gre_calc_hlen(flags);
751
752 gre_build_header(skb, tunnel->tun_hlen,
753 flags, protocol,
754 tunnel_id_to_key32(tun_info->key.tun_id),
755 (flags & TUNNEL_SEQ) ? htonl(tunnel->o_seqno++)
756 : 0);
757
758 } else {
759 if (tunnel->parms.o_flags & TUNNEL_SEQ)
760 tunnel->o_seqno++;
761
762 gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags,
763 protocol, tunnel->parms.o_key,
764 htonl(tunnel->o_seqno));
765 }
766
767 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
768 NEXTHDR_GRE);
769 }
770
771 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
772 {
773 struct ip6_tnl *t = netdev_priv(dev);
774 int encap_limit = -1;
775 struct flowi6 fl6;
776 __u8 dsfield = 0;
777 __u32 mtu;
778 int err;
779
780 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
781
782 if (!t->parms.collect_md)
783 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
784 &dsfield, &encap_limit);
785
786 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
787 if (err)
788 return -1;
789
790 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
791 skb->protocol);
792 if (err != 0) {
793 /* XXX: send ICMP error even if DF is not set. */
794 if (err == -EMSGSIZE)
795 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
796 htonl(mtu));
797 return -1;
798 }
799
800 return 0;
801 }
802
803 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
804 {
805 struct ip6_tnl *t = netdev_priv(dev);
806 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
807 int encap_limit = -1;
808 struct flowi6 fl6;
809 __u8 dsfield = 0;
810 __u32 mtu;
811 int err;
812
813 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
814 return -1;
815
816 if (!t->parms.collect_md &&
817 prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
818 return -1;
819
820 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
821 return -1;
822
823 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
824 &mtu, skb->protocol);
825 if (err != 0) {
826 if (err == -EMSGSIZE)
827 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
828 return -1;
829 }
830
831 return 0;
832 }
833
834 /**
835 * ip6gre_tnl_addr_conflict - compare packet addresses to tunnel's own
836 * @t: the outgoing tunnel device
837 * @hdr: IPv6 header from the incoming packet
838 *
839 * Description:
840 * Avoid trivial tunneling loop by checking that tunnel exit-point
841 * doesn't match source of incoming packet.
842 *
843 * Return:
844 * 1 if conflict,
845 * 0 else
846 **/
847
848 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
849 const struct ipv6hdr *hdr)
850 {
851 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
852 }
853
854 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
855 {
856 struct ip6_tnl *t = netdev_priv(dev);
857 int encap_limit = -1;
858 struct flowi6 fl6;
859 __u32 mtu;
860 int err;
861
862 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
863 encap_limit = t->parms.encap_limit;
864
865 if (!t->parms.collect_md)
866 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
867
868 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
869 if (err)
870 return err;
871
872 err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol);
873
874 return err;
875 }
876
877 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
878 struct net_device *dev)
879 {
880 struct ip6_tnl *t = netdev_priv(dev);
881 struct net_device_stats *stats = &t->dev->stats;
882 int ret;
883
884 if (!pskb_inet_may_pull(skb))
885 goto tx_err;
886
887 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
888 goto tx_err;
889
890 switch (skb->protocol) {
891 case htons(ETH_P_IP):
892 ret = ip6gre_xmit_ipv4(skb, dev);
893 break;
894 case htons(ETH_P_IPV6):
895 ret = ip6gre_xmit_ipv6(skb, dev);
896 break;
897 default:
898 ret = ip6gre_xmit_other(skb, dev);
899 break;
900 }
901
902 if (ret < 0)
903 goto tx_err;
904
905 return NETDEV_TX_OK;
906
907 tx_err:
908 stats->tx_errors++;
909 stats->tx_dropped++;
910 kfree_skb(skb);
911 return NETDEV_TX_OK;
912 }
913
914 static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
915 struct net_device *dev)
916 {
917 struct ip6_tnl *t = netdev_priv(dev);
918 struct dst_entry *dst = skb_dst(skb);
919 struct net_device_stats *stats;
920 bool truncate = false;
921 int encap_limit = -1;
922 __u8 dsfield = false;
923 struct flowi6 fl6;
924 int err = -EINVAL;
925 __be16 proto;
926 __u32 mtu;
927 int nhoff;
928 int thoff;
929
930 if (!pskb_inet_may_pull(skb))
931 goto tx_err;
932
933 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
934 goto tx_err;
935
936 if (gre_handle_offloads(skb, false))
937 goto tx_err;
938
939 if (skb->len > dev->mtu + dev->hard_header_len) {
940 pskb_trim(skb, dev->mtu + dev->hard_header_len);
941 truncate = true;
942 }
943
944 nhoff = skb_network_header(skb) - skb_mac_header(skb);
945 if (skb->protocol == htons(ETH_P_IP) &&
946 (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff))
947 truncate = true;
948
949 thoff = skb_transport_header(skb) - skb_mac_header(skb);
950 if (skb->protocol == htons(ETH_P_IPV6) &&
951 (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff))
952 truncate = true;
953
954 if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen))
955 goto tx_err;
956
957 t->parms.o_flags &= ~TUNNEL_KEY;
958 IPCB(skb)->flags = 0;
959
960 /* For collect_md mode, derive fl6 from the tunnel key,
961 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}.
962 */
963 if (t->parms.collect_md) {
964 struct ip_tunnel_info *tun_info;
965 const struct ip_tunnel_key *key;
966 struct erspan_metadata *md;
967 __be32 tun_id;
968
969 tun_info = skb_tunnel_info(skb);
970 if (unlikely(!tun_info ||
971 !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
972 ip_tunnel_info_af(tun_info) != AF_INET6))
973 goto tx_err;
974
975 key = &tun_info->key;
976 memset(&fl6, 0, sizeof(fl6));
977 fl6.flowi6_proto = IPPROTO_GRE;
978 fl6.daddr = key->u.ipv6.dst;
979 fl6.flowlabel = key->label;
980 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
981
982 dsfield = key->tos;
983 if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT))
984 goto tx_err;
985 if (tun_info->options_len < sizeof(*md))
986 goto tx_err;
987 md = ip_tunnel_info_opts(tun_info);
988
989 tun_id = tunnel_id_to_key32(key->tun_id);
990 if (md->version == 1) {
991 erspan_build_header(skb,
992 ntohl(tun_id),
993 ntohl(md->u.index), truncate,
994 false);
995 } else if (md->version == 2) {
996 erspan_build_header_v2(skb,
997 ntohl(tun_id),
998 md->u.md2.dir,
999 get_hwid(&md->u.md2),
1000 truncate, false);
1001 } else {
1002 goto tx_err;
1003 }
1004 } else {
1005 switch (skb->protocol) {
1006 case htons(ETH_P_IP):
1007 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1008 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
1009 &dsfield, &encap_limit);
1010 break;
1011 case htons(ETH_P_IPV6):
1012 if (ipv6_addr_equal(&t->parms.raddr, &ipv6_hdr(skb)->saddr))
1013 goto tx_err;
1014 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
1015 &dsfield, &encap_limit))
1016 goto tx_err;
1017 break;
1018 default:
1019 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1020 break;
1021 }
1022
1023 if (t->parms.erspan_ver == 1)
1024 erspan_build_header(skb, ntohl(t->parms.o_key),
1025 t->parms.index,
1026 truncate, false);
1027 else if (t->parms.erspan_ver == 2)
1028 erspan_build_header_v2(skb, ntohl(t->parms.o_key),
1029 t->parms.dir,
1030 t->parms.hwid,
1031 truncate, false);
1032 else
1033 goto tx_err;
1034
1035 fl6.daddr = t->parms.raddr;
1036 }
1037
1038 /* Push GRE header. */
1039 proto = (t->parms.erspan_ver == 1) ? htons(ETH_P_ERSPAN)
1040 : htons(ETH_P_ERSPAN2);
1041 gre_build_header(skb, 8, TUNNEL_SEQ, proto, 0, htonl(t->o_seqno++));
1042
1043 /* TooBig packet may have updated dst->dev's mtu */
1044 if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu)
1045 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu, false);
1046
1047 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1048 NEXTHDR_GRE);
1049 if (err != 0) {
1050 /* XXX: send ICMP error even if DF is not set. */
1051 if (err == -EMSGSIZE) {
1052 if (skb->protocol == htons(ETH_P_IP))
1053 icmp_send(skb, ICMP_DEST_UNREACH,
1054 ICMP_FRAG_NEEDED, htonl(mtu));
1055 else
1056 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1057 }
1058
1059 goto tx_err;
1060 }
1061 return NETDEV_TX_OK;
1062
1063 tx_err:
1064 stats = &t->dev->stats;
1065 stats->tx_errors++;
1066 stats->tx_dropped++;
1067 kfree_skb(skb);
1068 return NETDEV_TX_OK;
1069 }
1070
1071 static void ip6gre_tnl_link_config_common(struct ip6_tnl *t)
1072 {
1073 struct net_device *dev = t->dev;
1074 struct __ip6_tnl_parm *p = &t->parms;
1075 struct flowi6 *fl6 = &t->fl.u.ip6;
1076
1077 if (dev->type != ARPHRD_ETHER) {
1078 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1079 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1080 }
1081
1082 /* Set up flowi template */
1083 fl6->saddr = p->laddr;
1084 fl6->daddr = p->raddr;
1085 fl6->flowi6_oif = p->link;
1086 fl6->flowlabel = 0;
1087 fl6->flowi6_proto = IPPROTO_GRE;
1088
1089 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1090 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1091 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1092 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1093
1094 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1095 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1096
1097 if (p->flags&IP6_TNL_F_CAP_XMIT &&
1098 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1099 dev->flags |= IFF_POINTOPOINT;
1100 else
1101 dev->flags &= ~IFF_POINTOPOINT;
1102 }
1103
1104 static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu,
1105 int t_hlen)
1106 {
1107 const struct __ip6_tnl_parm *p = &t->parms;
1108 struct net_device *dev = t->dev;
1109
1110 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1111 int strict = (ipv6_addr_type(&p->raddr) &
1112 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1113
1114 struct rt6_info *rt = rt6_lookup(t->net,
1115 &p->raddr, &p->laddr,
1116 p->link, NULL, strict);
1117
1118 if (!rt)
1119 return;
1120
1121 if (rt->dst.dev) {
1122 dev->needed_headroom = rt->dst.dev->hard_header_len +
1123 t_hlen;
1124
1125 if (set_mtu) {
1126 dev->mtu = rt->dst.dev->mtu - t_hlen;
1127 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1128 dev->mtu -= 8;
1129 if (dev->type == ARPHRD_ETHER)
1130 dev->mtu -= ETH_HLEN;
1131
1132 if (dev->mtu < IPV6_MIN_MTU)
1133 dev->mtu = IPV6_MIN_MTU;
1134 }
1135 }
1136 ip6_rt_put(rt);
1137 }
1138 }
1139
1140 static int ip6gre_calc_hlen(struct ip6_tnl *tunnel)
1141 {
1142 int t_hlen;
1143
1144 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1145 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1146
1147 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1148 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1149 return t_hlen;
1150 }
1151
1152 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1153 {
1154 ip6gre_tnl_link_config_common(t);
1155 ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t));
1156 }
1157
1158 static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t,
1159 const struct __ip6_tnl_parm *p)
1160 {
1161 t->parms.laddr = p->laddr;
1162 t->parms.raddr = p->raddr;
1163 t->parms.flags = p->flags;
1164 t->parms.hop_limit = p->hop_limit;
1165 t->parms.encap_limit = p->encap_limit;
1166 t->parms.flowinfo = p->flowinfo;
1167 t->parms.link = p->link;
1168 t->parms.proto = p->proto;
1169 t->parms.i_key = p->i_key;
1170 t->parms.o_key = p->o_key;
1171 t->parms.i_flags = p->i_flags;
1172 t->parms.o_flags = p->o_flags;
1173 t->parms.fwmark = p->fwmark;
1174 t->parms.erspan_ver = p->erspan_ver;
1175 t->parms.index = p->index;
1176 t->parms.dir = p->dir;
1177 t->parms.hwid = p->hwid;
1178 dst_cache_reset(&t->dst_cache);
1179 }
1180
1181 static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
1182 int set_mtu)
1183 {
1184 ip6gre_tnl_copy_tnl_parm(t, p);
1185 ip6gre_tnl_link_config(t, set_mtu);
1186 return 0;
1187 }
1188
1189 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1190 const struct ip6_tnl_parm2 *u)
1191 {
1192 p->laddr = u->laddr;
1193 p->raddr = u->raddr;
1194 p->flags = u->flags;
1195 p->hop_limit = u->hop_limit;
1196 p->encap_limit = u->encap_limit;
1197 p->flowinfo = u->flowinfo;
1198 p->link = u->link;
1199 p->i_key = u->i_key;
1200 p->o_key = u->o_key;
1201 p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
1202 p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
1203 memcpy(p->name, u->name, sizeof(u->name));
1204 }
1205
1206 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1207 const struct __ip6_tnl_parm *p)
1208 {
1209 u->proto = IPPROTO_GRE;
1210 u->laddr = p->laddr;
1211 u->raddr = p->raddr;
1212 u->flags = p->flags;
1213 u->hop_limit = p->hop_limit;
1214 u->encap_limit = p->encap_limit;
1215 u->flowinfo = p->flowinfo;
1216 u->link = p->link;
1217 u->i_key = p->i_key;
1218 u->o_key = p->o_key;
1219 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1220 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
1221 memcpy(u->name, p->name, sizeof(u->name));
1222 }
1223
1224 static int ip6gre_tunnel_ioctl(struct net_device *dev,
1225 struct ifreq *ifr, int cmd)
1226 {
1227 int err = 0;
1228 struct ip6_tnl_parm2 p;
1229 struct __ip6_tnl_parm p1;
1230 struct ip6_tnl *t = netdev_priv(dev);
1231 struct net *net = t->net;
1232 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1233
1234 memset(&p1, 0, sizeof(p1));
1235
1236 switch (cmd) {
1237 case SIOCGETTUNNEL:
1238 if (dev == ign->fb_tunnel_dev) {
1239 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1240 err = -EFAULT;
1241 break;
1242 }
1243 ip6gre_tnl_parm_from_user(&p1, &p);
1244 t = ip6gre_tunnel_locate(net, &p1, 0);
1245 if (!t)
1246 t = netdev_priv(dev);
1247 }
1248 memset(&p, 0, sizeof(p));
1249 ip6gre_tnl_parm_to_user(&p, &t->parms);
1250 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1251 err = -EFAULT;
1252 break;
1253
1254 case SIOCADDTUNNEL:
1255 case SIOCCHGTUNNEL:
1256 err = -EPERM;
1257 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1258 goto done;
1259
1260 err = -EFAULT;
1261 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1262 goto done;
1263
1264 err = -EINVAL;
1265 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1266 goto done;
1267
1268 if (!(p.i_flags&GRE_KEY))
1269 p.i_key = 0;
1270 if (!(p.o_flags&GRE_KEY))
1271 p.o_key = 0;
1272
1273 ip6gre_tnl_parm_from_user(&p1, &p);
1274 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1275
1276 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1277 if (t) {
1278 if (t->dev != dev) {
1279 err = -EEXIST;
1280 break;
1281 }
1282 } else {
1283 t = netdev_priv(dev);
1284
1285 ip6gre_tunnel_unlink(ign, t);
1286 synchronize_net();
1287 ip6gre_tnl_change(t, &p1, 1);
1288 ip6gre_tunnel_link(ign, t);
1289 netdev_state_change(dev);
1290 }
1291 }
1292
1293 if (t) {
1294 err = 0;
1295
1296 memset(&p, 0, sizeof(p));
1297 ip6gre_tnl_parm_to_user(&p, &t->parms);
1298 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1299 err = -EFAULT;
1300 } else
1301 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1302 break;
1303
1304 case SIOCDELTUNNEL:
1305 err = -EPERM;
1306 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1307 goto done;
1308
1309 if (dev == ign->fb_tunnel_dev) {
1310 err = -EFAULT;
1311 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1312 goto done;
1313 err = -ENOENT;
1314 ip6gre_tnl_parm_from_user(&p1, &p);
1315 t = ip6gre_tunnel_locate(net, &p1, 0);
1316 if (!t)
1317 goto done;
1318 err = -EPERM;
1319 if (t == netdev_priv(ign->fb_tunnel_dev))
1320 goto done;
1321 dev = t->dev;
1322 }
1323 unregister_netdevice(dev);
1324 err = 0;
1325 break;
1326
1327 default:
1328 err = -EINVAL;
1329 }
1330
1331 done:
1332 return err;
1333 }
1334
1335 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1336 unsigned short type, const void *daddr,
1337 const void *saddr, unsigned int len)
1338 {
1339 struct ip6_tnl *t = netdev_priv(dev);
1340 struct ipv6hdr *ipv6h;
1341 __be16 *p;
1342
1343 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
1344 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1345 t->fl.u.ip6.flowlabel,
1346 true, &t->fl.u.ip6));
1347 ipv6h->hop_limit = t->parms.hop_limit;
1348 ipv6h->nexthdr = NEXTHDR_GRE;
1349 ipv6h->saddr = t->parms.laddr;
1350 ipv6h->daddr = t->parms.raddr;
1351
1352 p = (__be16 *)(ipv6h + 1);
1353 p[0] = t->parms.o_flags;
1354 p[1] = htons(type);
1355
1356 /*
1357 * Set the source hardware address.
1358 */
1359
1360 if (saddr)
1361 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1362 if (daddr)
1363 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1364 if (!ipv6_addr_any(&ipv6h->daddr))
1365 return t->hlen;
1366
1367 return -t->hlen;
1368 }
1369
1370 static const struct header_ops ip6gre_header_ops = {
1371 .create = ip6gre_header,
1372 };
1373
1374 static const struct net_device_ops ip6gre_netdev_ops = {
1375 .ndo_init = ip6gre_tunnel_init,
1376 .ndo_uninit = ip6gre_tunnel_uninit,
1377 .ndo_start_xmit = ip6gre_tunnel_xmit,
1378 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
1379 .ndo_change_mtu = ip6_tnl_change_mtu,
1380 .ndo_get_stats64 = ip_tunnel_get_stats64,
1381 .ndo_get_iflink = ip6_tnl_get_iflink,
1382 };
1383
1384 static void ip6gre_dev_free(struct net_device *dev)
1385 {
1386 struct ip6_tnl *t = netdev_priv(dev);
1387
1388 gro_cells_destroy(&t->gro_cells);
1389 dst_cache_destroy(&t->dst_cache);
1390 free_percpu(dev->tstats);
1391 }
1392
1393 static void ip6gre_tunnel_setup(struct net_device *dev)
1394 {
1395 dev->netdev_ops = &ip6gre_netdev_ops;
1396 dev->needs_free_netdev = true;
1397 dev->priv_destructor = ip6gre_dev_free;
1398
1399 dev->type = ARPHRD_IP6GRE;
1400
1401 dev->flags |= IFF_NOARP;
1402 dev->addr_len = sizeof(struct in6_addr);
1403 netif_keep_dst(dev);
1404 /* This perm addr will be used as interface identifier by IPv6 */
1405 dev->addr_assign_type = NET_ADDR_RANDOM;
1406 eth_random_addr(dev->perm_addr);
1407 }
1408
1409 #define GRE6_FEATURES (NETIF_F_SG | \
1410 NETIF_F_FRAGLIST | \
1411 NETIF_F_HIGHDMA | \
1412 NETIF_F_HW_CSUM)
1413
1414 static void ip6gre_tnl_init_features(struct net_device *dev)
1415 {
1416 struct ip6_tnl *nt = netdev_priv(dev);
1417
1418 dev->features |= GRE6_FEATURES;
1419 dev->hw_features |= GRE6_FEATURES;
1420
1421 if (!(nt->parms.o_flags & TUNNEL_SEQ)) {
1422 /* TCP offload with GRE SEQ is not supported, nor
1423 * can we support 2 levels of outer headers requiring
1424 * an update.
1425 */
1426 if (!(nt->parms.o_flags & TUNNEL_CSUM) ||
1427 nt->encap.type == TUNNEL_ENCAP_NONE) {
1428 dev->features |= NETIF_F_GSO_SOFTWARE;
1429 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1430 }
1431
1432 /* Can use a lockless transmit, unless we generate
1433 * output sequences
1434 */
1435 dev->features |= NETIF_F_LLTX;
1436 }
1437 }
1438
1439 static int ip6gre_tunnel_init_common(struct net_device *dev)
1440 {
1441 struct ip6_tnl *tunnel;
1442 int ret;
1443 int t_hlen;
1444
1445 tunnel = netdev_priv(dev);
1446
1447 tunnel->dev = dev;
1448 tunnel->net = dev_net(dev);
1449 strcpy(tunnel->parms.name, dev->name);
1450
1451 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1452 if (!dev->tstats)
1453 return -ENOMEM;
1454
1455 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1456 if (ret)
1457 goto cleanup_alloc_pcpu_stats;
1458
1459 ret = gro_cells_init(&tunnel->gro_cells, dev);
1460 if (ret)
1461 goto cleanup_dst_cache_init;
1462
1463 t_hlen = ip6gre_calc_hlen(tunnel);
1464 dev->mtu = ETH_DATA_LEN - t_hlen;
1465 if (dev->type == ARPHRD_ETHER)
1466 dev->mtu -= ETH_HLEN;
1467 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1468 dev->mtu -= 8;
1469
1470 if (tunnel->parms.collect_md) {
1471 netif_keep_dst(dev);
1472 }
1473 ip6gre_tnl_init_features(dev);
1474
1475 return 0;
1476
1477 cleanup_dst_cache_init:
1478 dst_cache_destroy(&tunnel->dst_cache);
1479 cleanup_alloc_pcpu_stats:
1480 free_percpu(dev->tstats);
1481 dev->tstats = NULL;
1482 return ret;
1483 }
1484
1485 static int ip6gre_tunnel_init(struct net_device *dev)
1486 {
1487 struct ip6_tnl *tunnel;
1488 int ret;
1489
1490 ret = ip6gre_tunnel_init_common(dev);
1491 if (ret)
1492 return ret;
1493
1494 tunnel = netdev_priv(dev);
1495
1496 if (tunnel->parms.collect_md)
1497 return 0;
1498
1499 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1500 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1501
1502 if (ipv6_addr_any(&tunnel->parms.raddr))
1503 dev->header_ops = &ip6gre_header_ops;
1504
1505 return 0;
1506 }
1507
1508 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1509 {
1510 struct ip6_tnl *tunnel = netdev_priv(dev);
1511
1512 tunnel->dev = dev;
1513 tunnel->net = dev_net(dev);
1514 strcpy(tunnel->parms.name, dev->name);
1515
1516 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1517
1518 dev_hold(dev);
1519 }
1520
1521 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1522 .handler = gre_rcv,
1523 .err_handler = ip6gre_err,
1524 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1525 };
1526
1527 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1528 {
1529 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1530 struct net_device *dev, *aux;
1531 int prio;
1532
1533 for_each_netdev_safe(net, dev, aux)
1534 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1535 dev->rtnl_link_ops == &ip6gre_tap_ops ||
1536 dev->rtnl_link_ops == &ip6erspan_tap_ops)
1537 unregister_netdevice_queue(dev, head);
1538
1539 for (prio = 0; prio < 4; prio++) {
1540 int h;
1541 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1542 struct ip6_tnl *t;
1543
1544 t = rtnl_dereference(ign->tunnels[prio][h]);
1545
1546 while (t) {
1547 /* If dev is in the same netns, it has already
1548 * been added to the list by the previous loop.
1549 */
1550 if (!net_eq(dev_net(t->dev), net))
1551 unregister_netdevice_queue(t->dev,
1552 head);
1553 t = rtnl_dereference(t->next);
1554 }
1555 }
1556 }
1557 }
1558
1559 static int __net_init ip6gre_init_net(struct net *net)
1560 {
1561 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1562 int err;
1563
1564 if (!net_has_fallback_tunnels(net))
1565 return 0;
1566 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1567 NET_NAME_UNKNOWN,
1568 ip6gre_tunnel_setup);
1569 if (!ign->fb_tunnel_dev) {
1570 err = -ENOMEM;
1571 goto err_alloc_dev;
1572 }
1573 dev_net_set(ign->fb_tunnel_dev, net);
1574 /* FB netdevice is special: we have one, and only one per netns.
1575 * Allowing to move it to another netns is clearly unsafe.
1576 */
1577 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1578
1579
1580 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1581 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1582
1583 err = register_netdev(ign->fb_tunnel_dev);
1584 if (err)
1585 goto err_reg_dev;
1586
1587 rcu_assign_pointer(ign->tunnels_wc[0],
1588 netdev_priv(ign->fb_tunnel_dev));
1589 return 0;
1590
1591 err_reg_dev:
1592 free_netdev(ign->fb_tunnel_dev);
1593 err_alloc_dev:
1594 return err;
1595 }
1596
1597 static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list)
1598 {
1599 struct net *net;
1600 LIST_HEAD(list);
1601
1602 rtnl_lock();
1603 list_for_each_entry(net, net_list, exit_list)
1604 ip6gre_destroy_tunnels(net, &list);
1605 unregister_netdevice_many(&list);
1606 rtnl_unlock();
1607 }
1608
1609 static struct pernet_operations ip6gre_net_ops = {
1610 .init = ip6gre_init_net,
1611 .exit_batch = ip6gre_exit_batch_net,
1612 .id = &ip6gre_net_id,
1613 .size = sizeof(struct ip6gre_net),
1614 };
1615
1616 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1617 struct netlink_ext_ack *extack)
1618 {
1619 __be16 flags;
1620
1621 if (!data)
1622 return 0;
1623
1624 flags = 0;
1625 if (data[IFLA_GRE_IFLAGS])
1626 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1627 if (data[IFLA_GRE_OFLAGS])
1628 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1629 if (flags & (GRE_VERSION|GRE_ROUTING))
1630 return -EINVAL;
1631
1632 return 0;
1633 }
1634
1635 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1636 struct netlink_ext_ack *extack)
1637 {
1638 struct in6_addr daddr;
1639
1640 if (tb[IFLA_ADDRESS]) {
1641 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1642 return -EINVAL;
1643 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1644 return -EADDRNOTAVAIL;
1645 }
1646
1647 if (!data)
1648 goto out;
1649
1650 if (data[IFLA_GRE_REMOTE]) {
1651 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1652 if (ipv6_addr_any(&daddr))
1653 return -EINVAL;
1654 }
1655
1656 out:
1657 return ip6gre_tunnel_validate(tb, data, extack);
1658 }
1659
1660 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1661 struct netlink_ext_ack *extack)
1662 {
1663 __be16 flags = 0;
1664 int ret, ver = 0;
1665
1666 if (!data)
1667 return 0;
1668
1669 ret = ip6gre_tap_validate(tb, data, extack);
1670 if (ret)
1671 return ret;
1672
1673 /* ERSPAN should only have GRE sequence and key flag */
1674 if (data[IFLA_GRE_OFLAGS])
1675 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1676 if (data[IFLA_GRE_IFLAGS])
1677 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1678 if (!data[IFLA_GRE_COLLECT_METADATA] &&
1679 flags != (GRE_SEQ | GRE_KEY))
1680 return -EINVAL;
1681
1682 /* ERSPAN Session ID only has 10-bit. Since we reuse
1683 * 32-bit key field as ID, check it's range.
1684 */
1685 if (data[IFLA_GRE_IKEY] &&
1686 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1687 return -EINVAL;
1688
1689 if (data[IFLA_GRE_OKEY] &&
1690 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1691 return -EINVAL;
1692
1693 if (data[IFLA_GRE_ERSPAN_VER]) {
1694 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1695 if (ver != 1 && ver != 2)
1696 return -EINVAL;
1697 }
1698
1699 if (ver == 1) {
1700 if (data[IFLA_GRE_ERSPAN_INDEX]) {
1701 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1702
1703 if (index & ~INDEX_MASK)
1704 return -EINVAL;
1705 }
1706 } else if (ver == 2) {
1707 if (data[IFLA_GRE_ERSPAN_DIR]) {
1708 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1709
1710 if (dir & ~(DIR_MASK >> DIR_OFFSET))
1711 return -EINVAL;
1712 }
1713
1714 if (data[IFLA_GRE_ERSPAN_HWID]) {
1715 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1716
1717 if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1718 return -EINVAL;
1719 }
1720 }
1721
1722 return 0;
1723 }
1724
1725 static void ip6erspan_set_version(struct nlattr *data[],
1726 struct __ip6_tnl_parm *parms)
1727 {
1728 if (!data)
1729 return;
1730
1731 parms->erspan_ver = 1;
1732 if (data[IFLA_GRE_ERSPAN_VER])
1733 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1734
1735 if (parms->erspan_ver == 1) {
1736 if (data[IFLA_GRE_ERSPAN_INDEX])
1737 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1738 } else if (parms->erspan_ver == 2) {
1739 if (data[IFLA_GRE_ERSPAN_DIR])
1740 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1741 if (data[IFLA_GRE_ERSPAN_HWID])
1742 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1743 }
1744 }
1745
1746 static void ip6gre_netlink_parms(struct nlattr *data[],
1747 struct __ip6_tnl_parm *parms)
1748 {
1749 memset(parms, 0, sizeof(*parms));
1750
1751 if (!data)
1752 return;
1753
1754 if (data[IFLA_GRE_LINK])
1755 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1756
1757 if (data[IFLA_GRE_IFLAGS])
1758 parms->i_flags = gre_flags_to_tnl_flags(
1759 nla_get_be16(data[IFLA_GRE_IFLAGS]));
1760
1761 if (data[IFLA_GRE_OFLAGS])
1762 parms->o_flags = gre_flags_to_tnl_flags(
1763 nla_get_be16(data[IFLA_GRE_OFLAGS]));
1764
1765 if (data[IFLA_GRE_IKEY])
1766 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1767
1768 if (data[IFLA_GRE_OKEY])
1769 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1770
1771 if (data[IFLA_GRE_LOCAL])
1772 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1773
1774 if (data[IFLA_GRE_REMOTE])
1775 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1776
1777 if (data[IFLA_GRE_TTL])
1778 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1779
1780 if (data[IFLA_GRE_ENCAP_LIMIT])
1781 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1782
1783 if (data[IFLA_GRE_FLOWINFO])
1784 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1785
1786 if (data[IFLA_GRE_FLAGS])
1787 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1788
1789 if (data[IFLA_GRE_FWMARK])
1790 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1791
1792 if (data[IFLA_GRE_COLLECT_METADATA])
1793 parms->collect_md = true;
1794 }
1795
1796 static int ip6gre_tap_init(struct net_device *dev)
1797 {
1798 int ret;
1799
1800 ret = ip6gre_tunnel_init_common(dev);
1801 if (ret)
1802 return ret;
1803
1804 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1805
1806 return 0;
1807 }
1808
1809 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1810 .ndo_init = ip6gre_tap_init,
1811 .ndo_uninit = ip6gre_tunnel_uninit,
1812 .ndo_start_xmit = ip6gre_tunnel_xmit,
1813 .ndo_set_mac_address = eth_mac_addr,
1814 .ndo_validate_addr = eth_validate_addr,
1815 .ndo_change_mtu = ip6_tnl_change_mtu,
1816 .ndo_get_stats64 = ip_tunnel_get_stats64,
1817 .ndo_get_iflink = ip6_tnl_get_iflink,
1818 };
1819
1820 static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel)
1821 {
1822 int t_hlen;
1823
1824 tunnel->tun_hlen = 8;
1825 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1826 erspan_hdr_len(tunnel->parms.erspan_ver);
1827
1828 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1829 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1830 return t_hlen;
1831 }
1832
1833 static int ip6erspan_tap_init(struct net_device *dev)
1834 {
1835 struct ip6_tnl *tunnel;
1836 int t_hlen;
1837 int ret;
1838
1839 tunnel = netdev_priv(dev);
1840
1841 tunnel->dev = dev;
1842 tunnel->net = dev_net(dev);
1843 strcpy(tunnel->parms.name, dev->name);
1844
1845 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1846 if (!dev->tstats)
1847 return -ENOMEM;
1848
1849 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1850 if (ret)
1851 goto cleanup_alloc_pcpu_stats;
1852
1853 ret = gro_cells_init(&tunnel->gro_cells, dev);
1854 if (ret)
1855 goto cleanup_dst_cache_init;
1856
1857 t_hlen = ip6erspan_calc_hlen(tunnel);
1858 dev->mtu = ETH_DATA_LEN - t_hlen;
1859 if (dev->type == ARPHRD_ETHER)
1860 dev->mtu -= ETH_HLEN;
1861 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1862 dev->mtu -= 8;
1863
1864 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1865 ip6erspan_tnl_link_config(tunnel, 1);
1866
1867 return 0;
1868
1869 cleanup_dst_cache_init:
1870 dst_cache_destroy(&tunnel->dst_cache);
1871 cleanup_alloc_pcpu_stats:
1872 free_percpu(dev->tstats);
1873 dev->tstats = NULL;
1874 return ret;
1875 }
1876
1877 static const struct net_device_ops ip6erspan_netdev_ops = {
1878 .ndo_init = ip6erspan_tap_init,
1879 .ndo_uninit = ip6erspan_tunnel_uninit,
1880 .ndo_start_xmit = ip6erspan_tunnel_xmit,
1881 .ndo_set_mac_address = eth_mac_addr,
1882 .ndo_validate_addr = eth_validate_addr,
1883 .ndo_change_mtu = ip6_tnl_change_mtu,
1884 .ndo_get_stats64 = ip_tunnel_get_stats64,
1885 .ndo_get_iflink = ip6_tnl_get_iflink,
1886 };
1887
1888 static void ip6gre_tap_setup(struct net_device *dev)
1889 {
1890
1891 ether_setup(dev);
1892
1893 dev->max_mtu = 0;
1894 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1895 dev->needs_free_netdev = true;
1896 dev->priv_destructor = ip6gre_dev_free;
1897
1898 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1899 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1900 netif_keep_dst(dev);
1901 }
1902
1903 static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1904 struct ip_tunnel_encap *ipencap)
1905 {
1906 bool ret = false;
1907
1908 memset(ipencap, 0, sizeof(*ipencap));
1909
1910 if (!data)
1911 return ret;
1912
1913 if (data[IFLA_GRE_ENCAP_TYPE]) {
1914 ret = true;
1915 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1916 }
1917
1918 if (data[IFLA_GRE_ENCAP_FLAGS]) {
1919 ret = true;
1920 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1921 }
1922
1923 if (data[IFLA_GRE_ENCAP_SPORT]) {
1924 ret = true;
1925 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1926 }
1927
1928 if (data[IFLA_GRE_ENCAP_DPORT]) {
1929 ret = true;
1930 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1931 }
1932
1933 return ret;
1934 }
1935
1936 static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev,
1937 struct nlattr *tb[], struct nlattr *data[],
1938 struct netlink_ext_ack *extack)
1939 {
1940 struct ip6_tnl *nt;
1941 struct ip_tunnel_encap ipencap;
1942 int err;
1943
1944 nt = netdev_priv(dev);
1945
1946 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1947 int err = ip6_tnl_encap_setup(nt, &ipencap);
1948
1949 if (err < 0)
1950 return err;
1951 }
1952
1953 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1954 eth_hw_addr_random(dev);
1955
1956 nt->dev = dev;
1957 nt->net = dev_net(dev);
1958
1959 err = register_netdevice(dev);
1960 if (err)
1961 goto out;
1962
1963 if (tb[IFLA_MTU])
1964 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1965
1966 dev_hold(dev);
1967
1968 out:
1969 return err;
1970 }
1971
1972 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1973 struct nlattr *tb[], struct nlattr *data[],
1974 struct netlink_ext_ack *extack)
1975 {
1976 struct ip6_tnl *nt = netdev_priv(dev);
1977 struct net *net = dev_net(dev);
1978 struct ip6gre_net *ign;
1979 int err;
1980
1981 ip6gre_netlink_parms(data, &nt->parms);
1982 ign = net_generic(net, ip6gre_net_id);
1983
1984 if (nt->parms.collect_md) {
1985 if (rtnl_dereference(ign->collect_md_tun))
1986 return -EEXIST;
1987 } else {
1988 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1989 return -EEXIST;
1990 }
1991
1992 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
1993 if (!err) {
1994 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1995 ip6gre_tunnel_link_md(ign, nt);
1996 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
1997 }
1998 return err;
1999 }
2000
2001 static struct ip6_tnl *
2002 ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[],
2003 struct nlattr *data[], struct __ip6_tnl_parm *p_p,
2004 struct netlink_ext_ack *extack)
2005 {
2006 struct ip6_tnl *t, *nt = netdev_priv(dev);
2007 struct net *net = nt->net;
2008 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2009 struct ip_tunnel_encap ipencap;
2010
2011 if (dev == ign->fb_tunnel_dev)
2012 return ERR_PTR(-EINVAL);
2013
2014 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
2015 int err = ip6_tnl_encap_setup(nt, &ipencap);
2016
2017 if (err < 0)
2018 return ERR_PTR(err);
2019 }
2020
2021 ip6gre_netlink_parms(data, p_p);
2022
2023 t = ip6gre_tunnel_locate(net, p_p, 0);
2024
2025 if (t) {
2026 if (t->dev != dev)
2027 return ERR_PTR(-EEXIST);
2028 } else {
2029 t = nt;
2030 }
2031
2032 return t;
2033 }
2034
2035 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
2036 struct nlattr *data[],
2037 struct netlink_ext_ack *extack)
2038 {
2039 struct ip6_tnl *t = netdev_priv(dev);
2040 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
2041 struct __ip6_tnl_parm p;
2042
2043 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2044 if (IS_ERR(t))
2045 return PTR_ERR(t);
2046
2047 ip6gre_tunnel_unlink_md(ign, t);
2048 ip6gre_tunnel_unlink(ign, t);
2049 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
2050 ip6gre_tunnel_link_md(ign, t);
2051 ip6gre_tunnel_link(ign, t);
2052 return 0;
2053 }
2054
2055 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
2056 {
2057 struct net *net = dev_net(dev);
2058 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2059
2060 if (dev != ign->fb_tunnel_dev)
2061 unregister_netdevice_queue(dev, head);
2062 }
2063
2064 static size_t ip6gre_get_size(const struct net_device *dev)
2065 {
2066 return
2067 /* IFLA_GRE_LINK */
2068 nla_total_size(4) +
2069 /* IFLA_GRE_IFLAGS */
2070 nla_total_size(2) +
2071 /* IFLA_GRE_OFLAGS */
2072 nla_total_size(2) +
2073 /* IFLA_GRE_IKEY */
2074 nla_total_size(4) +
2075 /* IFLA_GRE_OKEY */
2076 nla_total_size(4) +
2077 /* IFLA_GRE_LOCAL */
2078 nla_total_size(sizeof(struct in6_addr)) +
2079 /* IFLA_GRE_REMOTE */
2080 nla_total_size(sizeof(struct in6_addr)) +
2081 /* IFLA_GRE_TTL */
2082 nla_total_size(1) +
2083 /* IFLA_GRE_ENCAP_LIMIT */
2084 nla_total_size(1) +
2085 /* IFLA_GRE_FLOWINFO */
2086 nla_total_size(4) +
2087 /* IFLA_GRE_FLAGS */
2088 nla_total_size(4) +
2089 /* IFLA_GRE_ENCAP_TYPE */
2090 nla_total_size(2) +
2091 /* IFLA_GRE_ENCAP_FLAGS */
2092 nla_total_size(2) +
2093 /* IFLA_GRE_ENCAP_SPORT */
2094 nla_total_size(2) +
2095 /* IFLA_GRE_ENCAP_DPORT */
2096 nla_total_size(2) +
2097 /* IFLA_GRE_COLLECT_METADATA */
2098 nla_total_size(0) +
2099 /* IFLA_GRE_FWMARK */
2100 nla_total_size(4) +
2101 /* IFLA_GRE_ERSPAN_INDEX */
2102 nla_total_size(4) +
2103 0;
2104 }
2105
2106 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
2107 {
2108 struct ip6_tnl *t = netdev_priv(dev);
2109 struct __ip6_tnl_parm *p = &t->parms;
2110 __be16 o_flags = p->o_flags;
2111
2112 if (p->erspan_ver == 1 || p->erspan_ver == 2) {
2113 if (!p->collect_md)
2114 o_flags |= TUNNEL_KEY;
2115
2116 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
2117 goto nla_put_failure;
2118
2119 if (p->erspan_ver == 1) {
2120 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2121 goto nla_put_failure;
2122 } else {
2123 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
2124 goto nla_put_failure;
2125 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
2126 goto nla_put_failure;
2127 }
2128 }
2129
2130 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
2131 nla_put_be16(skb, IFLA_GRE_IFLAGS,
2132 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
2133 nla_put_be16(skb, IFLA_GRE_OFLAGS,
2134 gre_tnl_flags_to_gre_flags(o_flags)) ||
2135 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
2136 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
2137 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
2138 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
2139 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
2140 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
2141 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
2142 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
2143 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark))
2144 goto nla_put_failure;
2145
2146 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
2147 t->encap.type) ||
2148 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
2149 t->encap.sport) ||
2150 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
2151 t->encap.dport) ||
2152 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
2153 t->encap.flags))
2154 goto nla_put_failure;
2155
2156 if (p->collect_md) {
2157 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
2158 goto nla_put_failure;
2159 }
2160
2161 return 0;
2162
2163 nla_put_failure:
2164 return -EMSGSIZE;
2165 }
2166
2167 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
2168 [IFLA_GRE_LINK] = { .type = NLA_U32 },
2169 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
2170 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
2171 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
2172 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
2173 [IFLA_GRE_LOCAL] = { .len = sizeof_field(struct ipv6hdr, saddr) },
2174 [IFLA_GRE_REMOTE] = { .len = sizeof_field(struct ipv6hdr, daddr) },
2175 [IFLA_GRE_TTL] = { .type = NLA_U8 },
2176 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
2177 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
2178 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
2179 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 },
2180 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
2181 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
2182 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
2183 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
2184 [IFLA_GRE_FWMARK] = { .type = NLA_U32 },
2185 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
2186 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 },
2187 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 },
2188 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 },
2189 };
2190
2191 static void ip6erspan_tap_setup(struct net_device *dev)
2192 {
2193 ether_setup(dev);
2194
2195 dev->max_mtu = 0;
2196 dev->netdev_ops = &ip6erspan_netdev_ops;
2197 dev->needs_free_netdev = true;
2198 dev->priv_destructor = ip6gre_dev_free;
2199
2200 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2201 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2202 netif_keep_dst(dev);
2203 }
2204
2205 static int ip6erspan_newlink(struct net *src_net, struct net_device *dev,
2206 struct nlattr *tb[], struct nlattr *data[],
2207 struct netlink_ext_ack *extack)
2208 {
2209 struct ip6_tnl *nt = netdev_priv(dev);
2210 struct net *net = dev_net(dev);
2211 struct ip6gre_net *ign;
2212 int err;
2213
2214 ip6gre_netlink_parms(data, &nt->parms);
2215 ip6erspan_set_version(data, &nt->parms);
2216 ign = net_generic(net, ip6gre_net_id);
2217
2218 if (nt->parms.collect_md) {
2219 if (rtnl_dereference(ign->collect_md_tun_erspan))
2220 return -EEXIST;
2221 } else {
2222 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2223 return -EEXIST;
2224 }
2225
2226 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2227 if (!err) {
2228 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]);
2229 ip6erspan_tunnel_link_md(ign, nt);
2230 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2231 }
2232 return err;
2233 }
2234
2235 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu)
2236 {
2237 ip6gre_tnl_link_config_common(t);
2238 ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t));
2239 }
2240
2241 static int ip6erspan_tnl_change(struct ip6_tnl *t,
2242 const struct __ip6_tnl_parm *p, int set_mtu)
2243 {
2244 ip6gre_tnl_copy_tnl_parm(t, p);
2245 ip6erspan_tnl_link_config(t, set_mtu);
2246 return 0;
2247 }
2248
2249 static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[],
2250 struct nlattr *data[],
2251 struct netlink_ext_ack *extack)
2252 {
2253 struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2254 struct __ip6_tnl_parm p;
2255 struct ip6_tnl *t;
2256
2257 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2258 if (IS_ERR(t))
2259 return PTR_ERR(t);
2260
2261 ip6erspan_set_version(data, &p);
2262 ip6gre_tunnel_unlink_md(ign, t);
2263 ip6gre_tunnel_unlink(ign, t);
2264 ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]);
2265 ip6erspan_tunnel_link_md(ign, t);
2266 ip6gre_tunnel_link(ign, t);
2267 return 0;
2268 }
2269
2270 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
2271 .kind = "ip6gre",
2272 .maxtype = IFLA_GRE_MAX,
2273 .policy = ip6gre_policy,
2274 .priv_size = sizeof(struct ip6_tnl),
2275 .setup = ip6gre_tunnel_setup,
2276 .validate = ip6gre_tunnel_validate,
2277 .newlink = ip6gre_newlink,
2278 .changelink = ip6gre_changelink,
2279 .dellink = ip6gre_dellink,
2280 .get_size = ip6gre_get_size,
2281 .fill_info = ip6gre_fill_info,
2282 .get_link_net = ip6_tnl_get_link_net,
2283 };
2284
2285 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
2286 .kind = "ip6gretap",
2287 .maxtype = IFLA_GRE_MAX,
2288 .policy = ip6gre_policy,
2289 .priv_size = sizeof(struct ip6_tnl),
2290 .setup = ip6gre_tap_setup,
2291 .validate = ip6gre_tap_validate,
2292 .newlink = ip6gre_newlink,
2293 .changelink = ip6gre_changelink,
2294 .get_size = ip6gre_get_size,
2295 .fill_info = ip6gre_fill_info,
2296 .get_link_net = ip6_tnl_get_link_net,
2297 };
2298
2299 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = {
2300 .kind = "ip6erspan",
2301 .maxtype = IFLA_GRE_MAX,
2302 .policy = ip6gre_policy,
2303 .priv_size = sizeof(struct ip6_tnl),
2304 .setup = ip6erspan_tap_setup,
2305 .validate = ip6erspan_tap_validate,
2306 .newlink = ip6erspan_newlink,
2307 .changelink = ip6erspan_changelink,
2308 .get_size = ip6gre_get_size,
2309 .fill_info = ip6gre_fill_info,
2310 .get_link_net = ip6_tnl_get_link_net,
2311 };
2312
2313 /*
2314 * And now the modules code and kernel interface.
2315 */
2316
2317 static int __init ip6gre_init(void)
2318 {
2319 int err;
2320
2321 pr_info("GRE over IPv6 tunneling driver\n");
2322
2323 err = register_pernet_device(&ip6gre_net_ops);
2324 if (err < 0)
2325 return err;
2326
2327 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
2328 if (err < 0) {
2329 pr_info("%s: can't add protocol\n", __func__);
2330 goto add_proto_failed;
2331 }
2332
2333 err = rtnl_link_register(&ip6gre_link_ops);
2334 if (err < 0)
2335 goto rtnl_link_failed;
2336
2337 err = rtnl_link_register(&ip6gre_tap_ops);
2338 if (err < 0)
2339 goto tap_ops_failed;
2340
2341 err = rtnl_link_register(&ip6erspan_tap_ops);
2342 if (err < 0)
2343 goto erspan_link_failed;
2344
2345 out:
2346 return err;
2347
2348 erspan_link_failed:
2349 rtnl_link_unregister(&ip6gre_tap_ops);
2350 tap_ops_failed:
2351 rtnl_link_unregister(&ip6gre_link_ops);
2352 rtnl_link_failed:
2353 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2354 add_proto_failed:
2355 unregister_pernet_device(&ip6gre_net_ops);
2356 goto out;
2357 }
2358
2359 static void __exit ip6gre_fini(void)
2360 {
2361 rtnl_link_unregister(&ip6gre_tap_ops);
2362 rtnl_link_unregister(&ip6gre_link_ops);
2363 rtnl_link_unregister(&ip6erspan_tap_ops);
2364 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2365 unregister_pernet_device(&ip6gre_net_ops);
2366 }
2367
2368 module_init(ip6gre_init);
2369 module_exit(ip6gre_fini);
2370 MODULE_LICENSE("GPL");
2371 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
2372 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
2373 MODULE_ALIAS_RTNL_LINK("ip6gre");
2374 MODULE_ALIAS_RTNL_LINK("ip6gretap");
2375 MODULE_ALIAS_RTNL_LINK("ip6erspan");
2376 MODULE_ALIAS_NETDEV("ip6gre0");
Linux with added FPC-III support