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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
57static bool log_ecn_error = true;
58module_param(log_ecn_error, bool, 0644);
59MODULE_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
64static unsigned int ip6gre_net_id __read_mostly;
65struct 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
73static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
74static struct rtnl_link_ops ip6gre_tap_ops __read_mostly;
75static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly;
76static int ip6gre_tunnel_init(struct net_device *dev);
77static void ip6gre_tunnel_setup(struct net_device *dev);
78static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
79static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
80static 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))
101static 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
115static 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
249static 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
267static 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
273static 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
279static 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
285static 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
292static 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
298static 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
306static 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
321static 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
346static 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 strscpy(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 ip6gre_tunnel_link(ign, nt);
386 return nt;
387
388failed_free:
389 free_netdev(dev);
390 return NULL;
391}
392
393static void ip6erspan_tunnel_uninit(struct net_device *dev)
394{
395 struct ip6_tnl *t = netdev_priv(dev);
396 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
397
398 ip6erspan_tunnel_unlink_md(ign, t);
399 ip6gre_tunnel_unlink(ign, t);
400 dst_cache_reset(&t->dst_cache);
401 netdev_put(dev, &t->dev_tracker);
402}
403
404static void ip6gre_tunnel_uninit(struct net_device *dev)
405{
406 struct ip6_tnl *t = netdev_priv(dev);
407 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
408
409 ip6gre_tunnel_unlink_md(ign, t);
410 ip6gre_tunnel_unlink(ign, t);
411 if (ign->fb_tunnel_dev == dev)
412 WRITE_ONCE(ign->fb_tunnel_dev, NULL);
413 dst_cache_reset(&t->dst_cache);
414 netdev_put(dev, &t->dev_tracker);
415}
416
417
418static int ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
419 u8 type, u8 code, int offset, __be32 info)
420{
421 struct net *net = dev_net(skb->dev);
422 const struct ipv6hdr *ipv6h;
423 struct tnl_ptk_info tpi;
424 struct ip6_tnl *t;
425
426 if (gre_parse_header(skb, &tpi, NULL, htons(ETH_P_IPV6),
427 offset) < 0)
428 return -EINVAL;
429
430 ipv6h = (const struct ipv6hdr *)skb->data;
431 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
432 tpi.key, tpi.proto);
433 if (!t)
434 return -ENOENT;
435
436 switch (type) {
437 case ICMPV6_DEST_UNREACH:
438 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
439 t->parms.name);
440 if (code != ICMPV6_PORT_UNREACH)
441 break;
442 return 0;
443 case ICMPV6_TIME_EXCEED:
444 if (code == ICMPV6_EXC_HOPLIMIT) {
445 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
446 t->parms.name);
447 break;
448 }
449 return 0;
450 case ICMPV6_PARAMPROB: {
451 struct ipv6_tlv_tnl_enc_lim *tel;
452 __u32 teli;
453
454 teli = 0;
455 if (code == ICMPV6_HDR_FIELD)
456 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
457
458 if (teli && teli == be32_to_cpu(info) - 2) {
459 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
460 if (tel->encap_limit == 0) {
461 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
462 t->parms.name);
463 }
464 } else {
465 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
466 t->parms.name);
467 }
468 return 0;
469 }
470 case ICMPV6_PKT_TOOBIG:
471 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
472 return 0;
473 case NDISC_REDIRECT:
474 ip6_redirect(skb, net, skb->dev->ifindex, 0,
475 sock_net_uid(net, NULL));
476 return 0;
477 }
478
479 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
480 t->err_count++;
481 else
482 t->err_count = 1;
483 t->err_time = jiffies;
484
485 return 0;
486}
487
488static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
489{
490 const struct ipv6hdr *ipv6h;
491 struct ip6_tnl *tunnel;
492
493 ipv6h = ipv6_hdr(skb);
494 tunnel = ip6gre_tunnel_lookup(skb->dev,
495 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
496 tpi->proto);
497 if (tunnel) {
498 if (tunnel->parms.collect_md) {
499 struct metadata_dst *tun_dst;
500 __be64 tun_id;
501 __be16 flags;
502
503 flags = tpi->flags;
504 tun_id = key32_to_tunnel_id(tpi->key);
505
506 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0);
507 if (!tun_dst)
508 return PACKET_REJECT;
509
510 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
511 } else {
512 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
513 }
514
515 return PACKET_RCVD;
516 }
517
518 return PACKET_REJECT;
519}
520
521static int ip6erspan_rcv(struct sk_buff *skb,
522 struct tnl_ptk_info *tpi,
523 int gre_hdr_len)
524{
525 struct erspan_base_hdr *ershdr;
526 const struct ipv6hdr *ipv6h;
527 struct erspan_md2 *md2;
528 struct ip6_tnl *tunnel;
529 u8 ver;
530
531 if (unlikely(!pskb_may_pull(skb, sizeof(*ershdr))))
532 return PACKET_REJECT;
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
598static 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
621out:
622 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
623drop:
624 kfree_skb(skb);
625 return 0;
626}
627
628static 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
634static 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
660static 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_ndo_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
707static int prepare_ip6gre_xmit_other(struct sk_buff *skb,
708 struct net_device *dev,
709 struct flowi6 *fl6, __u8 *dsfield,
710 int *encap_limit)
711{
712 struct ip6_tnl *t = netdev_priv(dev);
713
714 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
715 *encap_limit = t->parms.encap_limit;
716
717 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
718
719 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
720 *dsfield = 0;
721 else
722 *dsfield = ip6_tclass(t->parms.flowinfo);
723
724 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
725 fl6->flowi6_mark = skb->mark;
726 else
727 fl6->flowi6_mark = t->parms.fwmark;
728
729 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
730
731 return 0;
732}
733
734static struct ip_tunnel_info *skb_tunnel_info_txcheck(struct sk_buff *skb)
735{
736 struct ip_tunnel_info *tun_info;
737
738 tun_info = skb_tunnel_info(skb);
739 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX)))
740 return ERR_PTR(-EINVAL);
741
742 return tun_info;
743}
744
745static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
746 struct net_device *dev, __u8 dsfield,
747 struct flowi6 *fl6, int encap_limit,
748 __u32 *pmtu, __be16 proto)
749{
750 struct ip6_tnl *tunnel = netdev_priv(dev);
751 __be16 protocol;
752 __be16 flags;
753
754 if (dev->type == ARPHRD_ETHER)
755 IPCB(skb)->flags = 0;
756
757 if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
758 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
759 else
760 fl6->daddr = tunnel->parms.raddr;
761
762 /* Push GRE header. */
763 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
764
765 if (tunnel->parms.collect_md) {
766 struct ip_tunnel_info *tun_info;
767 const struct ip_tunnel_key *key;
768 int tun_hlen;
769
770 tun_info = skb_tunnel_info_txcheck(skb);
771 if (IS_ERR(tun_info) ||
772 unlikely(ip_tunnel_info_af(tun_info) != AF_INET6))
773 return -EINVAL;
774
775 key = &tun_info->key;
776 memset(fl6, 0, sizeof(*fl6));
777 fl6->flowi6_proto = IPPROTO_GRE;
778 fl6->daddr = key->u.ipv6.dst;
779 fl6->flowlabel = key->label;
780 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
781 fl6->fl6_gre_key = tunnel_id_to_key32(key->tun_id);
782
783 dsfield = key->tos;
784 flags = key->tun_flags &
785 (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ);
786 tun_hlen = gre_calc_hlen(flags);
787
788 if (skb_cow_head(skb, dev->needed_headroom ?: tun_hlen + tunnel->encap_hlen))
789 return -ENOMEM;
790
791 gre_build_header(skb, tun_hlen,
792 flags, protocol,
793 tunnel_id_to_key32(tun_info->key.tun_id),
794 (flags & TUNNEL_SEQ) ? htonl(atomic_fetch_inc(&tunnel->o_seqno))
795 : 0);
796
797 } else {
798 if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen))
799 return -ENOMEM;
800
801 flags = tunnel->parms.o_flags;
802
803 gre_build_header(skb, tunnel->tun_hlen, flags,
804 protocol, tunnel->parms.o_key,
805 (flags & TUNNEL_SEQ) ? htonl(atomic_fetch_inc(&tunnel->o_seqno))
806 : 0);
807 }
808
809 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
810 NEXTHDR_GRE);
811}
812
813static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
814{
815 struct ip6_tnl *t = netdev_priv(dev);
816 int encap_limit = -1;
817 struct flowi6 fl6;
818 __u8 dsfield = 0;
819 __u32 mtu;
820 int err;
821
822 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
823
824 if (!t->parms.collect_md)
825 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
826 &dsfield, &encap_limit);
827
828 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
829 if (err)
830 return -1;
831
832 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
833 skb->protocol);
834 if (err != 0) {
835 /* XXX: send ICMP error even if DF is not set. */
836 if (err == -EMSGSIZE)
837 icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
838 htonl(mtu));
839 return -1;
840 }
841
842 return 0;
843}
844
845static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
846{
847 struct ip6_tnl *t = netdev_priv(dev);
848 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
849 int encap_limit = -1;
850 struct flowi6 fl6;
851 __u8 dsfield = 0;
852 __u32 mtu;
853 int err;
854
855 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
856 return -1;
857
858 if (!t->parms.collect_md &&
859 prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
860 return -1;
861
862 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
863 return -1;
864
865 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
866 &mtu, skb->protocol);
867 if (err != 0) {
868 if (err == -EMSGSIZE)
869 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
870 return -1;
871 }
872
873 return 0;
874}
875
876static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
877{
878 struct ip6_tnl *t = netdev_priv(dev);
879 int encap_limit = -1;
880 struct flowi6 fl6;
881 __u8 dsfield = 0;
882 __u32 mtu;
883 int err;
884
885 if (!t->parms.collect_md &&
886 prepare_ip6gre_xmit_other(skb, dev, &fl6, &dsfield, &encap_limit))
887 return -1;
888
889 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
890 if (err)
891 return err;
892 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, skb->protocol);
893
894 return err;
895}
896
897static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
898 struct net_device *dev)
899{
900 struct ip6_tnl *t = netdev_priv(dev);
901 __be16 payload_protocol;
902 int ret;
903
904 if (!pskb_inet_may_pull(skb))
905 goto tx_err;
906
907 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
908 goto tx_err;
909
910 payload_protocol = skb_protocol(skb, true);
911 switch (payload_protocol) {
912 case htons(ETH_P_IP):
913 ret = ip6gre_xmit_ipv4(skb, dev);
914 break;
915 case htons(ETH_P_IPV6):
916 ret = ip6gre_xmit_ipv6(skb, dev);
917 break;
918 default:
919 ret = ip6gre_xmit_other(skb, dev);
920 break;
921 }
922
923 if (ret < 0)
924 goto tx_err;
925
926 return NETDEV_TX_OK;
927
928tx_err:
929 if (!t->parms.collect_md || !IS_ERR(skb_tunnel_info_txcheck(skb)))
930 DEV_STATS_INC(dev, tx_errors);
931 DEV_STATS_INC(dev, tx_dropped);
932 kfree_skb(skb);
933 return NETDEV_TX_OK;
934}
935
936static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
937 struct net_device *dev)
938{
939 struct ip_tunnel_info *tun_info = NULL;
940 struct ip6_tnl *t = netdev_priv(dev);
941 struct dst_entry *dst = skb_dst(skb);
942 bool truncate = false;
943 int encap_limit = -1;
944 __u8 dsfield = false;
945 struct flowi6 fl6;
946 int err = -EINVAL;
947 __be16 proto;
948 __u32 mtu;
949 int nhoff;
950
951 if (!pskb_inet_may_pull(skb))
952 goto tx_err;
953
954 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
955 goto tx_err;
956
957 if (gre_handle_offloads(skb, false))
958 goto tx_err;
959
960 if (skb->len > dev->mtu + dev->hard_header_len) {
961 if (pskb_trim(skb, dev->mtu + dev->hard_header_len))
962 goto tx_err;
963 truncate = true;
964 }
965
966 nhoff = skb_network_offset(skb);
967 if (skb->protocol == htons(ETH_P_IP) &&
968 (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff))
969 truncate = true;
970
971 if (skb->protocol == htons(ETH_P_IPV6)) {
972 int thoff;
973
974 if (skb_transport_header_was_set(skb))
975 thoff = skb_transport_offset(skb);
976 else
977 thoff = nhoff + sizeof(struct ipv6hdr);
978 if (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff)
979 truncate = true;
980 }
981
982 if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen))
983 goto tx_err;
984
985 t->parms.o_flags &= ~TUNNEL_KEY;
986 IPCB(skb)->flags = 0;
987
988 /* For collect_md mode, derive fl6 from the tunnel key,
989 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}.
990 */
991 if (t->parms.collect_md) {
992 const struct ip_tunnel_key *key;
993 struct erspan_metadata *md;
994 __be32 tun_id;
995
996 tun_info = skb_tunnel_info_txcheck(skb);
997 if (IS_ERR(tun_info) ||
998 unlikely(ip_tunnel_info_af(tun_info) != AF_INET6))
999 goto tx_err;
1000
1001 key = &tun_info->key;
1002 memset(&fl6, 0, sizeof(fl6));
1003 fl6.flowi6_proto = IPPROTO_GRE;
1004 fl6.daddr = key->u.ipv6.dst;
1005 fl6.flowlabel = key->label;
1006 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
1007 fl6.fl6_gre_key = tunnel_id_to_key32(key->tun_id);
1008
1009 dsfield = key->tos;
1010 if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT))
1011 goto tx_err;
1012 if (tun_info->options_len < sizeof(*md))
1013 goto tx_err;
1014 md = ip_tunnel_info_opts(tun_info);
1015
1016 tun_id = tunnel_id_to_key32(key->tun_id);
1017 if (md->version == 1) {
1018 erspan_build_header(skb,
1019 ntohl(tun_id),
1020 ntohl(md->u.index), truncate,
1021 false);
1022 proto = htons(ETH_P_ERSPAN);
1023 } else if (md->version == 2) {
1024 erspan_build_header_v2(skb,
1025 ntohl(tun_id),
1026 md->u.md2.dir,
1027 get_hwid(&md->u.md2),
1028 truncate, false);
1029 proto = htons(ETH_P_ERSPAN2);
1030 } else {
1031 goto tx_err;
1032 }
1033 } else {
1034 switch (skb->protocol) {
1035 case htons(ETH_P_IP):
1036 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1037 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
1038 &dsfield, &encap_limit);
1039 break;
1040 case htons(ETH_P_IPV6):
1041 if (ipv6_addr_equal(&t->parms.raddr, &ipv6_hdr(skb)->saddr))
1042 goto tx_err;
1043 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
1044 &dsfield, &encap_limit))
1045 goto tx_err;
1046 break;
1047 default:
1048 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1049 break;
1050 }
1051
1052 if (t->parms.erspan_ver == 1) {
1053 erspan_build_header(skb, ntohl(t->parms.o_key),
1054 t->parms.index,
1055 truncate, false);
1056 proto = htons(ETH_P_ERSPAN);
1057 } else if (t->parms.erspan_ver == 2) {
1058 erspan_build_header_v2(skb, ntohl(t->parms.o_key),
1059 t->parms.dir,
1060 t->parms.hwid,
1061 truncate, false);
1062 proto = htons(ETH_P_ERSPAN2);
1063 } else {
1064 goto tx_err;
1065 }
1066
1067 fl6.daddr = t->parms.raddr;
1068 }
1069
1070 /* Push GRE header. */
1071 gre_build_header(skb, 8, TUNNEL_SEQ, proto, 0, htonl(atomic_fetch_inc(&t->o_seqno)));
1072
1073 /* TooBig packet may have updated dst->dev's mtu */
1074 if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu)
1075 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu, false);
1076
1077 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1078 NEXTHDR_GRE);
1079 if (err != 0) {
1080 /* XXX: send ICMP error even if DF is not set. */
1081 if (err == -EMSGSIZE) {
1082 if (skb->protocol == htons(ETH_P_IP))
1083 icmp_ndo_send(skb, ICMP_DEST_UNREACH,
1084 ICMP_FRAG_NEEDED, htonl(mtu));
1085 else
1086 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1087 }
1088
1089 goto tx_err;
1090 }
1091 return NETDEV_TX_OK;
1092
1093tx_err:
1094 if (!IS_ERR(tun_info))
1095 DEV_STATS_INC(dev, tx_errors);
1096 DEV_STATS_INC(dev, tx_dropped);
1097 kfree_skb(skb);
1098 return NETDEV_TX_OK;
1099}
1100
1101static void ip6gre_tnl_link_config_common(struct ip6_tnl *t)
1102{
1103 struct net_device *dev = t->dev;
1104 struct __ip6_tnl_parm *p = &t->parms;
1105 struct flowi6 *fl6 = &t->fl.u.ip6;
1106
1107 if (dev->type != ARPHRD_ETHER) {
1108 __dev_addr_set(dev, &p->laddr, sizeof(struct in6_addr));
1109 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1110 }
1111
1112 /* Set up flowi template */
1113 fl6->saddr = p->laddr;
1114 fl6->daddr = p->raddr;
1115 fl6->flowi6_oif = p->link;
1116 fl6->flowlabel = 0;
1117 fl6->flowi6_proto = IPPROTO_GRE;
1118 fl6->fl6_gre_key = t->parms.o_key;
1119
1120 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1121 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1122 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1123 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1124
1125 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1126 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1127
1128 if (p->flags&IP6_TNL_F_CAP_XMIT &&
1129 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1130 dev->flags |= IFF_POINTOPOINT;
1131 else
1132 dev->flags &= ~IFF_POINTOPOINT;
1133}
1134
1135static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu,
1136 int t_hlen)
1137{
1138 const struct __ip6_tnl_parm *p = &t->parms;
1139 struct net_device *dev = t->dev;
1140
1141 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1142 int strict = (ipv6_addr_type(&p->raddr) &
1143 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1144
1145 struct rt6_info *rt = rt6_lookup(t->net,
1146 &p->raddr, &p->laddr,
1147 p->link, NULL, strict);
1148
1149 if (!rt)
1150 return;
1151
1152 if (rt->dst.dev) {
1153 unsigned short dst_len = rt->dst.dev->hard_header_len +
1154 t_hlen;
1155
1156 if (t->dev->header_ops)
1157 dev->hard_header_len = dst_len;
1158 else
1159 dev->needed_headroom = dst_len;
1160
1161 if (set_mtu) {
1162 int mtu = rt->dst.dev->mtu - t_hlen;
1163
1164 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1165 mtu -= 8;
1166 if (dev->type == ARPHRD_ETHER)
1167 mtu -= ETH_HLEN;
1168
1169 if (mtu < IPV6_MIN_MTU)
1170 mtu = IPV6_MIN_MTU;
1171 WRITE_ONCE(dev->mtu, mtu);
1172 }
1173 }
1174 ip6_rt_put(rt);
1175 }
1176}
1177
1178static int ip6gre_calc_hlen(struct ip6_tnl *tunnel)
1179{
1180 int t_hlen;
1181
1182 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1183 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1184
1185 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1186
1187 if (tunnel->dev->header_ops)
1188 tunnel->dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1189 else
1190 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1191
1192 return t_hlen;
1193}
1194
1195static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1196{
1197 ip6gre_tnl_link_config_common(t);
1198 ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t));
1199}
1200
1201static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t,
1202 const struct __ip6_tnl_parm *p)
1203{
1204 t->parms.laddr = p->laddr;
1205 t->parms.raddr = p->raddr;
1206 t->parms.flags = p->flags;
1207 t->parms.hop_limit = p->hop_limit;
1208 t->parms.encap_limit = p->encap_limit;
1209 t->parms.flowinfo = p->flowinfo;
1210 t->parms.link = p->link;
1211 t->parms.proto = p->proto;
1212 t->parms.i_key = p->i_key;
1213 t->parms.o_key = p->o_key;
1214 t->parms.i_flags = p->i_flags;
1215 t->parms.o_flags = p->o_flags;
1216 t->parms.fwmark = p->fwmark;
1217 t->parms.erspan_ver = p->erspan_ver;
1218 t->parms.index = p->index;
1219 t->parms.dir = p->dir;
1220 t->parms.hwid = p->hwid;
1221 dst_cache_reset(&t->dst_cache);
1222}
1223
1224static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
1225 int set_mtu)
1226{
1227 ip6gre_tnl_copy_tnl_parm(t, p);
1228 ip6gre_tnl_link_config(t, set_mtu);
1229 return 0;
1230}
1231
1232static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1233 const struct ip6_tnl_parm2 *u)
1234{
1235 p->laddr = u->laddr;
1236 p->raddr = u->raddr;
1237 p->flags = u->flags;
1238 p->hop_limit = u->hop_limit;
1239 p->encap_limit = u->encap_limit;
1240 p->flowinfo = u->flowinfo;
1241 p->link = u->link;
1242 p->i_key = u->i_key;
1243 p->o_key = u->o_key;
1244 p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
1245 p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
1246 memcpy(p->name, u->name, sizeof(u->name));
1247}
1248
1249static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1250 const struct __ip6_tnl_parm *p)
1251{
1252 u->proto = IPPROTO_GRE;
1253 u->laddr = p->laddr;
1254 u->raddr = p->raddr;
1255 u->flags = p->flags;
1256 u->hop_limit = p->hop_limit;
1257 u->encap_limit = p->encap_limit;
1258 u->flowinfo = p->flowinfo;
1259 u->link = p->link;
1260 u->i_key = p->i_key;
1261 u->o_key = p->o_key;
1262 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1263 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
1264 memcpy(u->name, p->name, sizeof(u->name));
1265}
1266
1267static int ip6gre_tunnel_siocdevprivate(struct net_device *dev,
1268 struct ifreq *ifr, void __user *data,
1269 int cmd)
1270{
1271 int err = 0;
1272 struct ip6_tnl_parm2 p;
1273 struct __ip6_tnl_parm p1;
1274 struct ip6_tnl *t = netdev_priv(dev);
1275 struct net *net = t->net;
1276 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1277
1278 memset(&p1, 0, sizeof(p1));
1279
1280 switch (cmd) {
1281 case SIOCGETTUNNEL:
1282 if (dev == ign->fb_tunnel_dev) {
1283 if (copy_from_user(&p, data, sizeof(p))) {
1284 err = -EFAULT;
1285 break;
1286 }
1287 ip6gre_tnl_parm_from_user(&p1, &p);
1288 t = ip6gre_tunnel_locate(net, &p1, 0);
1289 if (!t)
1290 t = netdev_priv(dev);
1291 }
1292 memset(&p, 0, sizeof(p));
1293 ip6gre_tnl_parm_to_user(&p, &t->parms);
1294 if (copy_to_user(data, &p, sizeof(p)))
1295 err = -EFAULT;
1296 break;
1297
1298 case SIOCADDTUNNEL:
1299 case SIOCCHGTUNNEL:
1300 err = -EPERM;
1301 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1302 goto done;
1303
1304 err = -EFAULT;
1305 if (copy_from_user(&p, data, sizeof(p)))
1306 goto done;
1307
1308 err = -EINVAL;
1309 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1310 goto done;
1311
1312 if (!(p.i_flags&GRE_KEY))
1313 p.i_key = 0;
1314 if (!(p.o_flags&GRE_KEY))
1315 p.o_key = 0;
1316
1317 ip6gre_tnl_parm_from_user(&p1, &p);
1318 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1319
1320 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1321 if (t) {
1322 if (t->dev != dev) {
1323 err = -EEXIST;
1324 break;
1325 }
1326 } else {
1327 t = netdev_priv(dev);
1328
1329 ip6gre_tunnel_unlink(ign, t);
1330 synchronize_net();
1331 ip6gre_tnl_change(t, &p1, 1);
1332 ip6gre_tunnel_link(ign, t);
1333 netdev_state_change(dev);
1334 }
1335 }
1336
1337 if (t) {
1338 err = 0;
1339
1340 memset(&p, 0, sizeof(p));
1341 ip6gre_tnl_parm_to_user(&p, &t->parms);
1342 if (copy_to_user(data, &p, sizeof(p)))
1343 err = -EFAULT;
1344 } else
1345 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1346 break;
1347
1348 case SIOCDELTUNNEL:
1349 err = -EPERM;
1350 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1351 goto done;
1352
1353 if (dev == ign->fb_tunnel_dev) {
1354 err = -EFAULT;
1355 if (copy_from_user(&p, data, sizeof(p)))
1356 goto done;
1357 err = -ENOENT;
1358 ip6gre_tnl_parm_from_user(&p1, &p);
1359 t = ip6gre_tunnel_locate(net, &p1, 0);
1360 if (!t)
1361 goto done;
1362 err = -EPERM;
1363 if (t == netdev_priv(ign->fb_tunnel_dev))
1364 goto done;
1365 dev = t->dev;
1366 }
1367 unregister_netdevice(dev);
1368 err = 0;
1369 break;
1370
1371 default:
1372 err = -EINVAL;
1373 }
1374
1375done:
1376 return err;
1377}
1378
1379static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1380 unsigned short type, const void *daddr,
1381 const void *saddr, unsigned int len)
1382{
1383 struct ip6_tnl *t = netdev_priv(dev);
1384 struct ipv6hdr *ipv6h;
1385 __be16 *p;
1386
1387 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
1388 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1389 t->fl.u.ip6.flowlabel,
1390 true, &t->fl.u.ip6));
1391 ipv6h->hop_limit = t->parms.hop_limit;
1392 ipv6h->nexthdr = NEXTHDR_GRE;
1393 ipv6h->saddr = t->parms.laddr;
1394 ipv6h->daddr = t->parms.raddr;
1395
1396 p = (__be16 *)(ipv6h + 1);
1397 p[0] = t->parms.o_flags;
1398 p[1] = htons(type);
1399
1400 /*
1401 * Set the source hardware address.
1402 */
1403
1404 if (saddr)
1405 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1406 if (daddr)
1407 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1408 if (!ipv6_addr_any(&ipv6h->daddr))
1409 return t->hlen;
1410
1411 return -t->hlen;
1412}
1413
1414static const struct header_ops ip6gre_header_ops = {
1415 .create = ip6gre_header,
1416};
1417
1418static const struct net_device_ops ip6gre_netdev_ops = {
1419 .ndo_init = ip6gre_tunnel_init,
1420 .ndo_uninit = ip6gre_tunnel_uninit,
1421 .ndo_start_xmit = ip6gre_tunnel_xmit,
1422 .ndo_siocdevprivate = ip6gre_tunnel_siocdevprivate,
1423 .ndo_change_mtu = ip6_tnl_change_mtu,
1424 .ndo_get_stats64 = dev_get_tstats64,
1425 .ndo_get_iflink = ip6_tnl_get_iflink,
1426};
1427
1428static void ip6gre_dev_free(struct net_device *dev)
1429{
1430 struct ip6_tnl *t = netdev_priv(dev);
1431
1432 gro_cells_destroy(&t->gro_cells);
1433 dst_cache_destroy(&t->dst_cache);
1434 free_percpu(dev->tstats);
1435}
1436
1437static void ip6gre_tunnel_setup(struct net_device *dev)
1438{
1439 dev->netdev_ops = &ip6gre_netdev_ops;
1440 dev->needs_free_netdev = true;
1441 dev->priv_destructor = ip6gre_dev_free;
1442
1443 dev->type = ARPHRD_IP6GRE;
1444
1445 dev->flags |= IFF_NOARP;
1446 dev->addr_len = sizeof(struct in6_addr);
1447 netif_keep_dst(dev);
1448 /* This perm addr will be used as interface identifier by IPv6 */
1449 dev->addr_assign_type = NET_ADDR_RANDOM;
1450 eth_random_addr(dev->perm_addr);
1451}
1452
1453#define GRE6_FEATURES (NETIF_F_SG | \
1454 NETIF_F_FRAGLIST | \
1455 NETIF_F_HIGHDMA | \
1456 NETIF_F_HW_CSUM)
1457
1458static void ip6gre_tnl_init_features(struct net_device *dev)
1459{
1460 struct ip6_tnl *nt = netdev_priv(dev);
1461 __be16 flags;
1462
1463 dev->features |= GRE6_FEATURES | NETIF_F_LLTX;
1464 dev->hw_features |= GRE6_FEATURES;
1465
1466 flags = nt->parms.o_flags;
1467
1468 /* TCP offload with GRE SEQ is not supported, nor can we support 2
1469 * levels of outer headers requiring an update.
1470 */
1471 if (flags & TUNNEL_SEQ)
1472 return;
1473 if (flags & TUNNEL_CSUM && nt->encap.type != TUNNEL_ENCAP_NONE)
1474 return;
1475
1476 dev->features |= NETIF_F_GSO_SOFTWARE;
1477 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1478}
1479
1480static int ip6gre_tunnel_init_common(struct net_device *dev)
1481{
1482 struct ip6_tnl *tunnel;
1483 int ret;
1484 int t_hlen;
1485
1486 tunnel = netdev_priv(dev);
1487
1488 tunnel->dev = dev;
1489 tunnel->net = dev_net(dev);
1490 strcpy(tunnel->parms.name, dev->name);
1491
1492 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1493 if (!dev->tstats)
1494 return -ENOMEM;
1495
1496 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1497 if (ret)
1498 goto cleanup_alloc_pcpu_stats;
1499
1500 ret = gro_cells_init(&tunnel->gro_cells, dev);
1501 if (ret)
1502 goto cleanup_dst_cache_init;
1503
1504 t_hlen = ip6gre_calc_hlen(tunnel);
1505 dev->mtu = ETH_DATA_LEN - t_hlen;
1506 if (dev->type == ARPHRD_ETHER)
1507 dev->mtu -= ETH_HLEN;
1508 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1509 dev->mtu -= 8;
1510
1511 if (tunnel->parms.collect_md) {
1512 netif_keep_dst(dev);
1513 }
1514 ip6gre_tnl_init_features(dev);
1515
1516 netdev_hold(dev, &tunnel->dev_tracker, GFP_KERNEL);
1517 netdev_lockdep_set_classes(dev);
1518 return 0;
1519
1520cleanup_dst_cache_init:
1521 dst_cache_destroy(&tunnel->dst_cache);
1522cleanup_alloc_pcpu_stats:
1523 free_percpu(dev->tstats);
1524 dev->tstats = NULL;
1525 return ret;
1526}
1527
1528static int ip6gre_tunnel_init(struct net_device *dev)
1529{
1530 struct ip6_tnl *tunnel;
1531 int ret;
1532
1533 ret = ip6gre_tunnel_init_common(dev);
1534 if (ret)
1535 return ret;
1536
1537 tunnel = netdev_priv(dev);
1538
1539 if (tunnel->parms.collect_md)
1540 return 0;
1541
1542 __dev_addr_set(dev, &tunnel->parms.laddr, sizeof(struct in6_addr));
1543 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1544
1545 if (ipv6_addr_any(&tunnel->parms.raddr))
1546 dev->header_ops = &ip6gre_header_ops;
1547
1548 return 0;
1549}
1550
1551static void ip6gre_fb_tunnel_init(struct net_device *dev)
1552{
1553 struct ip6_tnl *tunnel = netdev_priv(dev);
1554
1555 tunnel->dev = dev;
1556 tunnel->net = dev_net(dev);
1557 strcpy(tunnel->parms.name, dev->name);
1558
1559 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1560}
1561
1562static struct inet6_protocol ip6gre_protocol __read_mostly = {
1563 .handler = gre_rcv,
1564 .err_handler = ip6gre_err,
1565 .flags = INET6_PROTO_FINAL,
1566};
1567
1568static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1569{
1570 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1571 struct net_device *dev, *aux;
1572 int prio;
1573
1574 for_each_netdev_safe(net, dev, aux)
1575 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1576 dev->rtnl_link_ops == &ip6gre_tap_ops ||
1577 dev->rtnl_link_ops == &ip6erspan_tap_ops)
1578 unregister_netdevice_queue(dev, head);
1579
1580 for (prio = 0; prio < 4; prio++) {
1581 int h;
1582 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1583 struct ip6_tnl *t;
1584
1585 t = rtnl_dereference(ign->tunnels[prio][h]);
1586
1587 while (t) {
1588 /* If dev is in the same netns, it has already
1589 * been added to the list by the previous loop.
1590 */
1591 if (!net_eq(dev_net(t->dev), net))
1592 unregister_netdevice_queue(t->dev,
1593 head);
1594 t = rtnl_dereference(t->next);
1595 }
1596 }
1597 }
1598}
1599
1600static int __net_init ip6gre_init_net(struct net *net)
1601{
1602 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1603 struct net_device *ndev;
1604 int err;
1605
1606 if (!net_has_fallback_tunnels(net))
1607 return 0;
1608 ndev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1609 NET_NAME_UNKNOWN, ip6gre_tunnel_setup);
1610 if (!ndev) {
1611 err = -ENOMEM;
1612 goto err_alloc_dev;
1613 }
1614 ign->fb_tunnel_dev = ndev;
1615 dev_net_set(ign->fb_tunnel_dev, net);
1616 /* FB netdevice is special: we have one, and only one per netns.
1617 * Allowing to move it to another netns is clearly unsafe.
1618 */
1619 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1620
1621
1622 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1623 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1624
1625 err = register_netdev(ign->fb_tunnel_dev);
1626 if (err)
1627 goto err_reg_dev;
1628
1629 rcu_assign_pointer(ign->tunnels_wc[0],
1630 netdev_priv(ign->fb_tunnel_dev));
1631 return 0;
1632
1633err_reg_dev:
1634 free_netdev(ndev);
1635err_alloc_dev:
1636 return err;
1637}
1638
1639static void __net_exit ip6gre_exit_batch_rtnl(struct list_head *net_list,
1640 struct list_head *dev_to_kill)
1641{
1642 struct net *net;
1643
1644 ASSERT_RTNL();
1645 list_for_each_entry(net, net_list, exit_list)
1646 ip6gre_destroy_tunnels(net, dev_to_kill);
1647}
1648
1649static struct pernet_operations ip6gre_net_ops = {
1650 .init = ip6gre_init_net,
1651 .exit_batch_rtnl = ip6gre_exit_batch_rtnl,
1652 .id = &ip6gre_net_id,
1653 .size = sizeof(struct ip6gre_net),
1654};
1655
1656static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1657 struct netlink_ext_ack *extack)
1658{
1659 __be16 flags;
1660
1661 if (!data)
1662 return 0;
1663
1664 flags = 0;
1665 if (data[IFLA_GRE_IFLAGS])
1666 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1667 if (data[IFLA_GRE_OFLAGS])
1668 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1669 if (flags & (GRE_VERSION|GRE_ROUTING))
1670 return -EINVAL;
1671
1672 return 0;
1673}
1674
1675static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1676 struct netlink_ext_ack *extack)
1677{
1678 struct in6_addr daddr;
1679
1680 if (tb[IFLA_ADDRESS]) {
1681 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1682 return -EINVAL;
1683 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1684 return -EADDRNOTAVAIL;
1685 }
1686
1687 if (!data)
1688 goto out;
1689
1690 if (data[IFLA_GRE_REMOTE]) {
1691 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1692 if (ipv6_addr_any(&daddr))
1693 return -EINVAL;
1694 }
1695
1696out:
1697 return ip6gre_tunnel_validate(tb, data, extack);
1698}
1699
1700static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1701 struct netlink_ext_ack *extack)
1702{
1703 __be16 flags = 0;
1704 int ret, ver = 0;
1705
1706 if (!data)
1707 return 0;
1708
1709 ret = ip6gre_tap_validate(tb, data, extack);
1710 if (ret)
1711 return ret;
1712
1713 /* ERSPAN should only have GRE sequence and key flag */
1714 if (data[IFLA_GRE_OFLAGS])
1715 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1716 if (data[IFLA_GRE_IFLAGS])
1717 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1718 if (!data[IFLA_GRE_COLLECT_METADATA] &&
1719 flags != (GRE_SEQ | GRE_KEY))
1720 return -EINVAL;
1721
1722 /* ERSPAN Session ID only has 10-bit. Since we reuse
1723 * 32-bit key field as ID, check it's range.
1724 */
1725 if (data[IFLA_GRE_IKEY] &&
1726 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1727 return -EINVAL;
1728
1729 if (data[IFLA_GRE_OKEY] &&
1730 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1731 return -EINVAL;
1732
1733 if (data[IFLA_GRE_ERSPAN_VER]) {
1734 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1735 if (ver != 1 && ver != 2)
1736 return -EINVAL;
1737 }
1738
1739 if (ver == 1) {
1740 if (data[IFLA_GRE_ERSPAN_INDEX]) {
1741 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1742
1743 if (index & ~INDEX_MASK)
1744 return -EINVAL;
1745 }
1746 } else if (ver == 2) {
1747 if (data[IFLA_GRE_ERSPAN_DIR]) {
1748 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1749
1750 if (dir & ~(DIR_MASK >> DIR_OFFSET))
1751 return -EINVAL;
1752 }
1753
1754 if (data[IFLA_GRE_ERSPAN_HWID]) {
1755 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1756
1757 if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1758 return -EINVAL;
1759 }
1760 }
1761
1762 return 0;
1763}
1764
1765static void ip6erspan_set_version(struct nlattr *data[],
1766 struct __ip6_tnl_parm *parms)
1767{
1768 if (!data)
1769 return;
1770
1771 parms->erspan_ver = 1;
1772 if (data[IFLA_GRE_ERSPAN_VER])
1773 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1774
1775 if (parms->erspan_ver == 1) {
1776 if (data[IFLA_GRE_ERSPAN_INDEX])
1777 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1778 } else if (parms->erspan_ver == 2) {
1779 if (data[IFLA_GRE_ERSPAN_DIR])
1780 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1781 if (data[IFLA_GRE_ERSPAN_HWID])
1782 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1783 }
1784}
1785
1786static void ip6gre_netlink_parms(struct nlattr *data[],
1787 struct __ip6_tnl_parm *parms)
1788{
1789 memset(parms, 0, sizeof(*parms));
1790
1791 if (!data)
1792 return;
1793
1794 if (data[IFLA_GRE_LINK])
1795 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1796
1797 if (data[IFLA_GRE_IFLAGS])
1798 parms->i_flags = gre_flags_to_tnl_flags(
1799 nla_get_be16(data[IFLA_GRE_IFLAGS]));
1800
1801 if (data[IFLA_GRE_OFLAGS])
1802 parms->o_flags = gre_flags_to_tnl_flags(
1803 nla_get_be16(data[IFLA_GRE_OFLAGS]));
1804
1805 if (data[IFLA_GRE_IKEY])
1806 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1807
1808 if (data[IFLA_GRE_OKEY])
1809 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1810
1811 if (data[IFLA_GRE_LOCAL])
1812 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1813
1814 if (data[IFLA_GRE_REMOTE])
1815 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1816
1817 if (data[IFLA_GRE_TTL])
1818 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1819
1820 if (data[IFLA_GRE_ENCAP_LIMIT])
1821 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1822
1823 if (data[IFLA_GRE_FLOWINFO])
1824 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1825
1826 if (data[IFLA_GRE_FLAGS])
1827 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1828
1829 if (data[IFLA_GRE_FWMARK])
1830 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1831
1832 if (data[IFLA_GRE_COLLECT_METADATA])
1833 parms->collect_md = true;
1834}
1835
1836static int ip6gre_tap_init(struct net_device *dev)
1837{
1838 int ret;
1839
1840 ret = ip6gre_tunnel_init_common(dev);
1841 if (ret)
1842 return ret;
1843
1844 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1845
1846 return 0;
1847}
1848
1849static const struct net_device_ops ip6gre_tap_netdev_ops = {
1850 .ndo_init = ip6gre_tap_init,
1851 .ndo_uninit = ip6gre_tunnel_uninit,
1852 .ndo_start_xmit = ip6gre_tunnel_xmit,
1853 .ndo_set_mac_address = eth_mac_addr,
1854 .ndo_validate_addr = eth_validate_addr,
1855 .ndo_change_mtu = ip6_tnl_change_mtu,
1856 .ndo_get_stats64 = dev_get_tstats64,
1857 .ndo_get_iflink = ip6_tnl_get_iflink,
1858};
1859
1860static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel)
1861{
1862 int t_hlen;
1863
1864 tunnel->tun_hlen = 8;
1865 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1866 erspan_hdr_len(tunnel->parms.erspan_ver);
1867
1868 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1869 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1870 return t_hlen;
1871}
1872
1873static int ip6erspan_tap_init(struct net_device *dev)
1874{
1875 struct ip6_tnl *tunnel;
1876 int t_hlen;
1877 int ret;
1878
1879 tunnel = netdev_priv(dev);
1880
1881 tunnel->dev = dev;
1882 tunnel->net = dev_net(dev);
1883 strcpy(tunnel->parms.name, dev->name);
1884
1885 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1886 if (!dev->tstats)
1887 return -ENOMEM;
1888
1889 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1890 if (ret)
1891 goto cleanup_alloc_pcpu_stats;
1892
1893 ret = gro_cells_init(&tunnel->gro_cells, dev);
1894 if (ret)
1895 goto cleanup_dst_cache_init;
1896
1897 t_hlen = ip6erspan_calc_hlen(tunnel);
1898 dev->mtu = ETH_DATA_LEN - t_hlen;
1899 if (dev->type == ARPHRD_ETHER)
1900 dev->mtu -= ETH_HLEN;
1901 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1902 dev->mtu -= 8;
1903
1904 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1905 ip6erspan_tnl_link_config(tunnel, 1);
1906
1907 netdev_hold(dev, &tunnel->dev_tracker, GFP_KERNEL);
1908 netdev_lockdep_set_classes(dev);
1909 return 0;
1910
1911cleanup_dst_cache_init:
1912 dst_cache_destroy(&tunnel->dst_cache);
1913cleanup_alloc_pcpu_stats:
1914 free_percpu(dev->tstats);
1915 dev->tstats = NULL;
1916 return ret;
1917}
1918
1919static const struct net_device_ops ip6erspan_netdev_ops = {
1920 .ndo_init = ip6erspan_tap_init,
1921 .ndo_uninit = ip6erspan_tunnel_uninit,
1922 .ndo_start_xmit = ip6erspan_tunnel_xmit,
1923 .ndo_set_mac_address = eth_mac_addr,
1924 .ndo_validate_addr = eth_validate_addr,
1925 .ndo_change_mtu = ip6_tnl_change_mtu,
1926 .ndo_get_stats64 = dev_get_tstats64,
1927 .ndo_get_iflink = ip6_tnl_get_iflink,
1928};
1929
1930static void ip6gre_tap_setup(struct net_device *dev)
1931{
1932
1933 ether_setup(dev);
1934
1935 dev->max_mtu = 0;
1936 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1937 dev->needs_free_netdev = true;
1938 dev->priv_destructor = ip6gre_dev_free;
1939
1940 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1941 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1942 netif_keep_dst(dev);
1943}
1944
1945static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1946 struct ip_tunnel_encap *ipencap)
1947{
1948 bool ret = false;
1949
1950 memset(ipencap, 0, sizeof(*ipencap));
1951
1952 if (!data)
1953 return ret;
1954
1955 if (data[IFLA_GRE_ENCAP_TYPE]) {
1956 ret = true;
1957 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1958 }
1959
1960 if (data[IFLA_GRE_ENCAP_FLAGS]) {
1961 ret = true;
1962 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1963 }
1964
1965 if (data[IFLA_GRE_ENCAP_SPORT]) {
1966 ret = true;
1967 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1968 }
1969
1970 if (data[IFLA_GRE_ENCAP_DPORT]) {
1971 ret = true;
1972 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1973 }
1974
1975 return ret;
1976}
1977
1978static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev,
1979 struct nlattr *tb[], struct nlattr *data[],
1980 struct netlink_ext_ack *extack)
1981{
1982 struct ip6_tnl *nt;
1983 struct ip_tunnel_encap ipencap;
1984 int err;
1985
1986 nt = netdev_priv(dev);
1987
1988 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1989 int err = ip6_tnl_encap_setup(nt, &ipencap);
1990
1991 if (err < 0)
1992 return err;
1993 }
1994
1995 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1996 eth_hw_addr_random(dev);
1997
1998 nt->dev = dev;
1999 nt->net = dev_net(dev);
2000
2001 err = register_netdevice(dev);
2002 if (err)
2003 goto out;
2004
2005 if (tb[IFLA_MTU])
2006 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
2007
2008out:
2009 return err;
2010}
2011
2012static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
2013 struct nlattr *tb[], struct nlattr *data[],
2014 struct netlink_ext_ack *extack)
2015{
2016 struct ip6_tnl *nt = netdev_priv(dev);
2017 struct net *net = dev_net(dev);
2018 struct ip6gre_net *ign;
2019 int err;
2020
2021 ip6gre_netlink_parms(data, &nt->parms);
2022 ign = net_generic(net, ip6gre_net_id);
2023
2024 if (nt->parms.collect_md) {
2025 if (rtnl_dereference(ign->collect_md_tun))
2026 return -EEXIST;
2027 } else {
2028 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2029 return -EEXIST;
2030 }
2031
2032 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2033 if (!err) {
2034 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
2035 ip6gre_tunnel_link_md(ign, nt);
2036 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2037 }
2038 return err;
2039}
2040
2041static struct ip6_tnl *
2042ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[],
2043 struct nlattr *data[], struct __ip6_tnl_parm *p_p,
2044 struct netlink_ext_ack *extack)
2045{
2046 struct ip6_tnl *t, *nt = netdev_priv(dev);
2047 struct net *net = nt->net;
2048 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2049 struct ip_tunnel_encap ipencap;
2050
2051 if (dev == ign->fb_tunnel_dev)
2052 return ERR_PTR(-EINVAL);
2053
2054 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
2055 int err = ip6_tnl_encap_setup(nt, &ipencap);
2056
2057 if (err < 0)
2058 return ERR_PTR(err);
2059 }
2060
2061 ip6gre_netlink_parms(data, p_p);
2062
2063 t = ip6gre_tunnel_locate(net, p_p, 0);
2064
2065 if (t) {
2066 if (t->dev != dev)
2067 return ERR_PTR(-EEXIST);
2068 } else {
2069 t = nt;
2070 }
2071
2072 return t;
2073}
2074
2075static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
2076 struct nlattr *data[],
2077 struct netlink_ext_ack *extack)
2078{
2079 struct ip6_tnl *t = netdev_priv(dev);
2080 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
2081 struct __ip6_tnl_parm p;
2082
2083 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2084 if (IS_ERR(t))
2085 return PTR_ERR(t);
2086
2087 ip6gre_tunnel_unlink_md(ign, t);
2088 ip6gre_tunnel_unlink(ign, t);
2089 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
2090 ip6gre_tunnel_link_md(ign, t);
2091 ip6gre_tunnel_link(ign, t);
2092 return 0;
2093}
2094
2095static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
2096{
2097 struct net *net = dev_net(dev);
2098 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2099
2100 if (dev != ign->fb_tunnel_dev)
2101 unregister_netdevice_queue(dev, head);
2102}
2103
2104static size_t ip6gre_get_size(const struct net_device *dev)
2105{
2106 return
2107 /* IFLA_GRE_LINK */
2108 nla_total_size(4) +
2109 /* IFLA_GRE_IFLAGS */
2110 nla_total_size(2) +
2111 /* IFLA_GRE_OFLAGS */
2112 nla_total_size(2) +
2113 /* IFLA_GRE_IKEY */
2114 nla_total_size(4) +
2115 /* IFLA_GRE_OKEY */
2116 nla_total_size(4) +
2117 /* IFLA_GRE_LOCAL */
2118 nla_total_size(sizeof(struct in6_addr)) +
2119 /* IFLA_GRE_REMOTE */
2120 nla_total_size(sizeof(struct in6_addr)) +
2121 /* IFLA_GRE_TTL */
2122 nla_total_size(1) +
2123 /* IFLA_GRE_ENCAP_LIMIT */
2124 nla_total_size(1) +
2125 /* IFLA_GRE_FLOWINFO */
2126 nla_total_size(4) +
2127 /* IFLA_GRE_FLAGS */
2128 nla_total_size(4) +
2129 /* IFLA_GRE_ENCAP_TYPE */
2130 nla_total_size(2) +
2131 /* IFLA_GRE_ENCAP_FLAGS */
2132 nla_total_size(2) +
2133 /* IFLA_GRE_ENCAP_SPORT */
2134 nla_total_size(2) +
2135 /* IFLA_GRE_ENCAP_DPORT */
2136 nla_total_size(2) +
2137 /* IFLA_GRE_COLLECT_METADATA */
2138 nla_total_size(0) +
2139 /* IFLA_GRE_FWMARK */
2140 nla_total_size(4) +
2141 /* IFLA_GRE_ERSPAN_INDEX */
2142 nla_total_size(4) +
2143 0;
2144}
2145
2146static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
2147{
2148 struct ip6_tnl *t = netdev_priv(dev);
2149 struct __ip6_tnl_parm *p = &t->parms;
2150 __be16 o_flags = p->o_flags;
2151
2152 if (p->erspan_ver == 1 || p->erspan_ver == 2) {
2153 if (!p->collect_md)
2154 o_flags |= TUNNEL_KEY;
2155
2156 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
2157 goto nla_put_failure;
2158
2159 if (p->erspan_ver == 1) {
2160 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2161 goto nla_put_failure;
2162 } else {
2163 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
2164 goto nla_put_failure;
2165 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
2166 goto nla_put_failure;
2167 }
2168 }
2169
2170 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
2171 nla_put_be16(skb, IFLA_GRE_IFLAGS,
2172 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
2173 nla_put_be16(skb, IFLA_GRE_OFLAGS,
2174 gre_tnl_flags_to_gre_flags(o_flags)) ||
2175 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
2176 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
2177 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
2178 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
2179 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
2180 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
2181 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
2182 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
2183 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark))
2184 goto nla_put_failure;
2185
2186 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
2187 t->encap.type) ||
2188 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
2189 t->encap.sport) ||
2190 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
2191 t->encap.dport) ||
2192 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
2193 t->encap.flags))
2194 goto nla_put_failure;
2195
2196 if (p->collect_md) {
2197 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
2198 goto nla_put_failure;
2199 }
2200
2201 return 0;
2202
2203nla_put_failure:
2204 return -EMSGSIZE;
2205}
2206
2207static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
2208 [IFLA_GRE_LINK] = { .type = NLA_U32 },
2209 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
2210 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
2211 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
2212 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
2213 [IFLA_GRE_LOCAL] = { .len = sizeof_field(struct ipv6hdr, saddr) },
2214 [IFLA_GRE_REMOTE] = { .len = sizeof_field(struct ipv6hdr, daddr) },
2215 [IFLA_GRE_TTL] = { .type = NLA_U8 },
2216 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
2217 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
2218 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
2219 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 },
2220 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
2221 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
2222 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
2223 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
2224 [IFLA_GRE_FWMARK] = { .type = NLA_U32 },
2225 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
2226 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 },
2227 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 },
2228 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 },
2229};
2230
2231static void ip6erspan_tap_setup(struct net_device *dev)
2232{
2233 ether_setup(dev);
2234
2235 dev->max_mtu = 0;
2236 dev->netdev_ops = &ip6erspan_netdev_ops;
2237 dev->needs_free_netdev = true;
2238 dev->priv_destructor = ip6gre_dev_free;
2239
2240 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2241 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2242 netif_keep_dst(dev);
2243}
2244
2245static int ip6erspan_newlink(struct net *src_net, struct net_device *dev,
2246 struct nlattr *tb[], struct nlattr *data[],
2247 struct netlink_ext_ack *extack)
2248{
2249 struct ip6_tnl *nt = netdev_priv(dev);
2250 struct net *net = dev_net(dev);
2251 struct ip6gre_net *ign;
2252 int err;
2253
2254 ip6gre_netlink_parms(data, &nt->parms);
2255 ip6erspan_set_version(data, &nt->parms);
2256 ign = net_generic(net, ip6gre_net_id);
2257
2258 if (nt->parms.collect_md) {
2259 if (rtnl_dereference(ign->collect_md_tun_erspan))
2260 return -EEXIST;
2261 } else {
2262 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2263 return -EEXIST;
2264 }
2265
2266 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2267 if (!err) {
2268 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]);
2269 ip6erspan_tunnel_link_md(ign, nt);
2270 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2271 }
2272 return err;
2273}
2274
2275static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu)
2276{
2277 ip6gre_tnl_link_config_common(t);
2278 ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t));
2279}
2280
2281static int ip6erspan_tnl_change(struct ip6_tnl *t,
2282 const struct __ip6_tnl_parm *p, int set_mtu)
2283{
2284 ip6gre_tnl_copy_tnl_parm(t, p);
2285 ip6erspan_tnl_link_config(t, set_mtu);
2286 return 0;
2287}
2288
2289static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[],
2290 struct nlattr *data[],
2291 struct netlink_ext_ack *extack)
2292{
2293 struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2294 struct __ip6_tnl_parm p;
2295 struct ip6_tnl *t;
2296
2297 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2298 if (IS_ERR(t))
2299 return PTR_ERR(t);
2300
2301 ip6erspan_set_version(data, &p);
2302 ip6gre_tunnel_unlink_md(ign, t);
2303 ip6gre_tunnel_unlink(ign, t);
2304 ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]);
2305 ip6erspan_tunnel_link_md(ign, t);
2306 ip6gre_tunnel_link(ign, t);
2307 return 0;
2308}
2309
2310static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
2311 .kind = "ip6gre",
2312 .maxtype = IFLA_GRE_MAX,
2313 .policy = ip6gre_policy,
2314 .priv_size = sizeof(struct ip6_tnl),
2315 .setup = ip6gre_tunnel_setup,
2316 .validate = ip6gre_tunnel_validate,
2317 .newlink = ip6gre_newlink,
2318 .changelink = ip6gre_changelink,
2319 .dellink = ip6gre_dellink,
2320 .get_size = ip6gre_get_size,
2321 .fill_info = ip6gre_fill_info,
2322 .get_link_net = ip6_tnl_get_link_net,
2323};
2324
2325static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
2326 .kind = "ip6gretap",
2327 .maxtype = IFLA_GRE_MAX,
2328 .policy = ip6gre_policy,
2329 .priv_size = sizeof(struct ip6_tnl),
2330 .setup = ip6gre_tap_setup,
2331 .validate = ip6gre_tap_validate,
2332 .newlink = ip6gre_newlink,
2333 .changelink = ip6gre_changelink,
2334 .get_size = ip6gre_get_size,
2335 .fill_info = ip6gre_fill_info,
2336 .get_link_net = ip6_tnl_get_link_net,
2337};
2338
2339static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = {
2340 .kind = "ip6erspan",
2341 .maxtype = IFLA_GRE_MAX,
2342 .policy = ip6gre_policy,
2343 .priv_size = sizeof(struct ip6_tnl),
2344 .setup = ip6erspan_tap_setup,
2345 .validate = ip6erspan_tap_validate,
2346 .newlink = ip6erspan_newlink,
2347 .changelink = ip6erspan_changelink,
2348 .get_size = ip6gre_get_size,
2349 .fill_info = ip6gre_fill_info,
2350 .get_link_net = ip6_tnl_get_link_net,
2351};
2352
2353/*
2354 * And now the modules code and kernel interface.
2355 */
2356
2357static int __init ip6gre_init(void)
2358{
2359 int err;
2360
2361 pr_info("GRE over IPv6 tunneling driver\n");
2362
2363 err = register_pernet_device(&ip6gre_net_ops);
2364 if (err < 0)
2365 return err;
2366
2367 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
2368 if (err < 0) {
2369 pr_info("%s: can't add protocol\n", __func__);
2370 goto add_proto_failed;
2371 }
2372
2373 err = rtnl_link_register(&ip6gre_link_ops);
2374 if (err < 0)
2375 goto rtnl_link_failed;
2376
2377 err = rtnl_link_register(&ip6gre_tap_ops);
2378 if (err < 0)
2379 goto tap_ops_failed;
2380
2381 err = rtnl_link_register(&ip6erspan_tap_ops);
2382 if (err < 0)
2383 goto erspan_link_failed;
2384
2385out:
2386 return err;
2387
2388erspan_link_failed:
2389 rtnl_link_unregister(&ip6gre_tap_ops);
2390tap_ops_failed:
2391 rtnl_link_unregister(&ip6gre_link_ops);
2392rtnl_link_failed:
2393 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2394add_proto_failed:
2395 unregister_pernet_device(&ip6gre_net_ops);
2396 goto out;
2397}
2398
2399static void __exit ip6gre_fini(void)
2400{
2401 rtnl_link_unregister(&ip6gre_tap_ops);
2402 rtnl_link_unregister(&ip6gre_link_ops);
2403 rtnl_link_unregister(&ip6erspan_tap_ops);
2404 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2405 unregister_pernet_device(&ip6gre_net_ops);
2406}
2407
2408module_init(ip6gre_init);
2409module_exit(ip6gre_fini);
2410MODULE_LICENSE("GPL");
2411MODULE_AUTHOR("D. Kozlov <xeb@mail.ru>");
2412MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
2413MODULE_ALIAS_RTNL_LINK("ip6gre");
2414MODULE_ALIAS_RTNL_LINK("ip6gretap");
2415MODULE_ALIAS_RTNL_LINK("ip6erspan");
2416MODULE_ALIAS_NETDEV("ip6gre0");