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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
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
248static 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
266static 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
272static 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
278static 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
284static 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
291static 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
297static 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
305static 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
320static 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
345static 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
393failed_free:
394 free_netdev(dev);
395 return NULL;
396}
397
398static 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
409static 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
421static 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 struct ipv6_tlv_tnl_enc_lim *tel;
441 __u32 teli;
442 case ICMPV6_DEST_UNREACH:
443 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
444 t->parms.name);
445 if (code != ICMPV6_PORT_UNREACH)
446 break;
447 return 0;
448 case ICMPV6_TIME_EXCEED:
449 if (code == ICMPV6_EXC_HOPLIMIT) {
450 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
451 t->parms.name);
452 break;
453 }
454 return 0;
455 case ICMPV6_PARAMPROB:
456 teli = 0;
457 if (code == ICMPV6_HDR_FIELD)
458 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
459
460 if (teli && teli == be32_to_cpu(info) - 2) {
461 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
462 if (tel->encap_limit == 0) {
463 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
464 t->parms.name);
465 }
466 } else {
467 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
468 t->parms.name);
469 }
470 return 0;
471 case ICMPV6_PKT_TOOBIG:
472 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
473 return 0;
474 case NDISC_REDIRECT:
475 ip6_redirect(skb, net, skb->dev->ifindex, 0,
476 sock_net_uid(net, NULL));
477 return 0;
478 }
479
480 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
481 t->err_count++;
482 else
483 t->err_count = 1;
484 t->err_time = jiffies;
485
486 return 0;
487}
488
489static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
490{
491 const struct ipv6hdr *ipv6h;
492 struct ip6_tnl *tunnel;
493
494 ipv6h = ipv6_hdr(skb);
495 tunnel = ip6gre_tunnel_lookup(skb->dev,
496 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
497 tpi->proto);
498 if (tunnel) {
499 if (tunnel->parms.collect_md) {
500 struct metadata_dst *tun_dst;
501 __be64 tun_id;
502 __be16 flags;
503
504 flags = tpi->flags;
505 tun_id = key32_to_tunnel_id(tpi->key);
506
507 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0);
508 if (!tun_dst)
509 return PACKET_REJECT;
510
511 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
512 } else {
513 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
514 }
515
516 return PACKET_RCVD;
517 }
518
519 return PACKET_REJECT;
520}
521
522static int ip6erspan_rcv(struct sk_buff *skb,
523 struct tnl_ptk_info *tpi,
524 int gre_hdr_len)
525{
526 struct erspan_base_hdr *ershdr;
527 const struct ipv6hdr *ipv6h;
528 struct erspan_md2 *md2;
529 struct ip6_tnl *tunnel;
530 u8 ver;
531
532 ipv6h = ipv6_hdr(skb);
533 ershdr = (struct erspan_base_hdr *)skb->data;
534 ver = ershdr->ver;
535
536 tunnel = ip6gre_tunnel_lookup(skb->dev,
537 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
538 tpi->proto);
539 if (tunnel) {
540 int len = erspan_hdr_len(ver);
541
542 if (unlikely(!pskb_may_pull(skb, len)))
543 return PACKET_REJECT;
544
545 if (__iptunnel_pull_header(skb, len,
546 htons(ETH_P_TEB),
547 false, false) < 0)
548 return PACKET_REJECT;
549
550 if (tunnel->parms.collect_md) {
551 struct erspan_metadata *pkt_md, *md;
552 struct metadata_dst *tun_dst;
553 struct ip_tunnel_info *info;
554 unsigned char *gh;
555 __be64 tun_id;
556 __be16 flags;
557
558 tpi->flags |= TUNNEL_KEY;
559 flags = tpi->flags;
560 tun_id = key32_to_tunnel_id(tpi->key);
561
562 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id,
563 sizeof(*md));
564 if (!tun_dst)
565 return PACKET_REJECT;
566
567 /* skb can be uncloned in __iptunnel_pull_header, so
568 * old pkt_md is no longer valid and we need to reset
569 * it
570 */
571 gh = skb_network_header(skb) +
572 skb_network_header_len(skb);
573 pkt_md = (struct erspan_metadata *)(gh + gre_hdr_len +
574 sizeof(*ershdr));
575 info = &tun_dst->u.tun_info;
576 md = ip_tunnel_info_opts(info);
577 md->version = ver;
578 md2 = &md->u.md2;
579 memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE :
580 ERSPAN_V2_MDSIZE);
581 info->key.tun_flags |= TUNNEL_ERSPAN_OPT;
582 info->options_len = sizeof(*md);
583
584 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
585
586 } else {
587 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
588 }
589
590 return PACKET_RCVD;
591 }
592
593 return PACKET_REJECT;
594}
595
596static int gre_rcv(struct sk_buff *skb)
597{
598 struct tnl_ptk_info tpi;
599 bool csum_err = false;
600 int hdr_len;
601
602 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
603 if (hdr_len < 0)
604 goto drop;
605
606 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
607 goto drop;
608
609 if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) ||
610 tpi.proto == htons(ETH_P_ERSPAN2))) {
611 if (ip6erspan_rcv(skb, &tpi, hdr_len) == PACKET_RCVD)
612 return 0;
613 goto out;
614 }
615
616 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
617 return 0;
618
619out:
620 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
621drop:
622 kfree_skb(skb);
623 return 0;
624}
625
626static int gre_handle_offloads(struct sk_buff *skb, bool csum)
627{
628 return iptunnel_handle_offloads(skb,
629 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
630}
631
632static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb,
633 struct net_device *dev,
634 struct flowi6 *fl6, __u8 *dsfield,
635 int *encap_limit)
636{
637 const struct iphdr *iph = ip_hdr(skb);
638 struct ip6_tnl *t = netdev_priv(dev);
639
640 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
641 *encap_limit = t->parms.encap_limit;
642
643 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
644
645 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
646 *dsfield = ipv4_get_dsfield(iph);
647 else
648 *dsfield = ip6_tclass(t->parms.flowinfo);
649
650 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
651 fl6->flowi6_mark = skb->mark;
652 else
653 fl6->flowi6_mark = t->parms.fwmark;
654
655 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
656}
657
658static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb,
659 struct net_device *dev,
660 struct flowi6 *fl6, __u8 *dsfield,
661 int *encap_limit)
662{
663 struct ipv6hdr *ipv6h;
664 struct ip6_tnl *t = netdev_priv(dev);
665 __u16 offset;
666
667 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
668 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
669 ipv6h = ipv6_hdr(skb);
670
671 if (offset > 0) {
672 struct ipv6_tlv_tnl_enc_lim *tel;
673
674 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
675 if (tel->encap_limit == 0) {
676 icmpv6_send(skb, ICMPV6_PARAMPROB,
677 ICMPV6_HDR_FIELD, offset + 2);
678 return -1;
679 }
680 *encap_limit = tel->encap_limit - 1;
681 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
682 *encap_limit = t->parms.encap_limit;
683 }
684
685 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
686
687 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
688 *dsfield = ipv6_get_dsfield(ipv6h);
689 else
690 *dsfield = ip6_tclass(t->parms.flowinfo);
691
692 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
693 fl6->flowlabel |= ip6_flowlabel(ipv6h);
694
695 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
696 fl6->flowi6_mark = skb->mark;
697 else
698 fl6->flowi6_mark = t->parms.fwmark;
699
700 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
701
702 return 0;
703}
704
705static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
706 struct net_device *dev, __u8 dsfield,
707 struct flowi6 *fl6, int encap_limit,
708 __u32 *pmtu, __be16 proto)
709{
710 struct ip6_tnl *tunnel = netdev_priv(dev);
711 __be16 protocol;
712
713 if (dev->type == ARPHRD_ETHER)
714 IPCB(skb)->flags = 0;
715
716 if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
717 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
718 else
719 fl6->daddr = tunnel->parms.raddr;
720
721 if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen))
722 return -ENOMEM;
723
724 /* Push GRE header. */
725 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
726
727 if (tunnel->parms.collect_md) {
728 struct ip_tunnel_info *tun_info;
729 const struct ip_tunnel_key *key;
730 __be16 flags;
731
732 tun_info = skb_tunnel_info(skb);
733 if (unlikely(!tun_info ||
734 !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
735 ip_tunnel_info_af(tun_info) != AF_INET6))
736 return -EINVAL;
737
738 key = &tun_info->key;
739 memset(fl6, 0, sizeof(*fl6));
740 fl6->flowi6_proto = IPPROTO_GRE;
741 fl6->daddr = key->u.ipv6.dst;
742 fl6->flowlabel = key->label;
743 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
744
745 dsfield = key->tos;
746 flags = key->tun_flags &
747 (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ);
748 tunnel->tun_hlen = gre_calc_hlen(flags);
749
750 gre_build_header(skb, tunnel->tun_hlen,
751 flags, protocol,
752 tunnel_id_to_key32(tun_info->key.tun_id),
753 (flags & TUNNEL_SEQ) ? htonl(tunnel->o_seqno++)
754 : 0);
755
756 } else {
757 if (tunnel->parms.o_flags & TUNNEL_SEQ)
758 tunnel->o_seqno++;
759
760 gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags,
761 protocol, tunnel->parms.o_key,
762 htonl(tunnel->o_seqno));
763 }
764
765 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
766 NEXTHDR_GRE);
767}
768
769static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
770{
771 struct ip6_tnl *t = netdev_priv(dev);
772 int encap_limit = -1;
773 struct flowi6 fl6;
774 __u8 dsfield = 0;
775 __u32 mtu;
776 int err;
777
778 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
779
780 if (!t->parms.collect_md)
781 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
782 &dsfield, &encap_limit);
783
784 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
785 if (err)
786 return -1;
787
788 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
789 skb->protocol);
790 if (err != 0) {
791 /* XXX: send ICMP error even if DF is not set. */
792 if (err == -EMSGSIZE)
793 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
794 htonl(mtu));
795 return -1;
796 }
797
798 return 0;
799}
800
801static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
802{
803 struct ip6_tnl *t = netdev_priv(dev);
804 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
805 int encap_limit = -1;
806 struct flowi6 fl6;
807 __u8 dsfield = 0;
808 __u32 mtu;
809 int err;
810
811 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
812 return -1;
813
814 if (!t->parms.collect_md &&
815 prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
816 return -1;
817
818 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
819 return -1;
820
821 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
822 &mtu, skb->protocol);
823 if (err != 0) {
824 if (err == -EMSGSIZE)
825 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
826 return -1;
827 }
828
829 return 0;
830}
831
832/**
833 * ip6gre_tnl_addr_conflict - compare packet addresses to tunnel's own
834 * @t: the outgoing tunnel device
835 * @hdr: IPv6 header from the incoming packet
836 *
837 * Description:
838 * Avoid trivial tunneling loop by checking that tunnel exit-point
839 * doesn't match source of incoming packet.
840 *
841 * Return:
842 * 1 if conflict,
843 * 0 else
844 **/
845
846static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
847 const struct ipv6hdr *hdr)
848{
849 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
850}
851
852static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
853{
854 struct ip6_tnl *t = netdev_priv(dev);
855 int encap_limit = -1;
856 struct flowi6 fl6;
857 __u32 mtu;
858 int err;
859
860 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
861 encap_limit = t->parms.encap_limit;
862
863 if (!t->parms.collect_md)
864 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
865
866 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
867 if (err)
868 return err;
869
870 err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol);
871
872 return err;
873}
874
875static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
876 struct net_device *dev)
877{
878 struct ip6_tnl *t = netdev_priv(dev);
879 struct net_device_stats *stats = &t->dev->stats;
880 int ret;
881
882 if (!pskb_inet_may_pull(skb))
883 goto tx_err;
884
885 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
886 goto tx_err;
887
888 switch (skb->protocol) {
889 case htons(ETH_P_IP):
890 ret = ip6gre_xmit_ipv4(skb, dev);
891 break;
892 case htons(ETH_P_IPV6):
893 ret = ip6gre_xmit_ipv6(skb, dev);
894 break;
895 default:
896 ret = ip6gre_xmit_other(skb, dev);
897 break;
898 }
899
900 if (ret < 0)
901 goto tx_err;
902
903 return NETDEV_TX_OK;
904
905tx_err:
906 stats->tx_errors++;
907 stats->tx_dropped++;
908 kfree_skb(skb);
909 return NETDEV_TX_OK;
910}
911
912static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
913 struct net_device *dev)
914{
915 struct ip6_tnl *t = netdev_priv(dev);
916 struct dst_entry *dst = skb_dst(skb);
917 struct net_device_stats *stats;
918 bool truncate = false;
919 int encap_limit = -1;
920 __u8 dsfield = false;
921 struct flowi6 fl6;
922 int err = -EINVAL;
923 __be16 proto;
924 __u32 mtu;
925 int nhoff;
926 int thoff;
927
928 if (!pskb_inet_may_pull(skb))
929 goto tx_err;
930
931 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
932 goto tx_err;
933
934 if (gre_handle_offloads(skb, false))
935 goto tx_err;
936
937 if (skb->len > dev->mtu + dev->hard_header_len) {
938 pskb_trim(skb, dev->mtu + dev->hard_header_len);
939 truncate = true;
940 }
941
942 nhoff = skb_network_header(skb) - skb_mac_header(skb);
943 if (skb->protocol == htons(ETH_P_IP) &&
944 (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff))
945 truncate = true;
946
947 thoff = skb_transport_header(skb) - skb_mac_header(skb);
948 if (skb->protocol == htons(ETH_P_IPV6) &&
949 (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff))
950 truncate = true;
951
952 if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen))
953 goto tx_err;
954
955 t->parms.o_flags &= ~TUNNEL_KEY;
956 IPCB(skb)->flags = 0;
957
958 /* For collect_md mode, derive fl6 from the tunnel key,
959 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}.
960 */
961 if (t->parms.collect_md) {
962 struct ip_tunnel_info *tun_info;
963 const struct ip_tunnel_key *key;
964 struct erspan_metadata *md;
965 __be32 tun_id;
966
967 tun_info = skb_tunnel_info(skb);
968 if (unlikely(!tun_info ||
969 !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
970 ip_tunnel_info_af(tun_info) != AF_INET6))
971 goto tx_err;
972
973 key = &tun_info->key;
974 memset(&fl6, 0, sizeof(fl6));
975 fl6.flowi6_proto = IPPROTO_GRE;
976 fl6.daddr = key->u.ipv6.dst;
977 fl6.flowlabel = key->label;
978 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
979
980 dsfield = key->tos;
981 if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT))
982 goto tx_err;
983 if (tun_info->options_len < sizeof(*md))
984 goto tx_err;
985 md = ip_tunnel_info_opts(tun_info);
986
987 tun_id = tunnel_id_to_key32(key->tun_id);
988 if (md->version == 1) {
989 erspan_build_header(skb,
990 ntohl(tun_id),
991 ntohl(md->u.index), truncate,
992 false);
993 } else if (md->version == 2) {
994 erspan_build_header_v2(skb,
995 ntohl(tun_id),
996 md->u.md2.dir,
997 get_hwid(&md->u.md2),
998 truncate, false);
999 } else {
1000 goto tx_err;
1001 }
1002 } else {
1003 switch (skb->protocol) {
1004 case htons(ETH_P_IP):
1005 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1006 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
1007 &dsfield, &encap_limit);
1008 break;
1009 case htons(ETH_P_IPV6):
1010 if (ipv6_addr_equal(&t->parms.raddr, &ipv6_hdr(skb)->saddr))
1011 goto tx_err;
1012 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
1013 &dsfield, &encap_limit))
1014 goto tx_err;
1015 break;
1016 default:
1017 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1018 break;
1019 }
1020
1021 if (t->parms.erspan_ver == 1)
1022 erspan_build_header(skb, ntohl(t->parms.o_key),
1023 t->parms.index,
1024 truncate, false);
1025 else if (t->parms.erspan_ver == 2)
1026 erspan_build_header_v2(skb, ntohl(t->parms.o_key),
1027 t->parms.dir,
1028 t->parms.hwid,
1029 truncate, false);
1030 else
1031 goto tx_err;
1032
1033 fl6.daddr = t->parms.raddr;
1034 }
1035
1036 /* Push GRE header. */
1037 proto = (t->parms.erspan_ver == 1) ? htons(ETH_P_ERSPAN)
1038 : htons(ETH_P_ERSPAN2);
1039 gre_build_header(skb, 8, TUNNEL_SEQ, proto, 0, htonl(t->o_seqno++));
1040
1041 /* TooBig packet may have updated dst->dev's mtu */
1042 if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu)
1043 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu);
1044
1045 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1046 NEXTHDR_GRE);
1047 if (err != 0) {
1048 /* XXX: send ICMP error even if DF is not set. */
1049 if (err == -EMSGSIZE) {
1050 if (skb->protocol == htons(ETH_P_IP))
1051 icmp_send(skb, ICMP_DEST_UNREACH,
1052 ICMP_FRAG_NEEDED, htonl(mtu));
1053 else
1054 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1055 }
1056
1057 goto tx_err;
1058 }
1059 return NETDEV_TX_OK;
1060
1061tx_err:
1062 stats = &t->dev->stats;
1063 stats->tx_errors++;
1064 stats->tx_dropped++;
1065 kfree_skb(skb);
1066 return NETDEV_TX_OK;
1067}
1068
1069static void ip6gre_tnl_link_config_common(struct ip6_tnl *t)
1070{
1071 struct net_device *dev = t->dev;
1072 struct __ip6_tnl_parm *p = &t->parms;
1073 struct flowi6 *fl6 = &t->fl.u.ip6;
1074
1075 if (dev->type != ARPHRD_ETHER) {
1076 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1077 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1078 }
1079
1080 /* Set up flowi template */
1081 fl6->saddr = p->laddr;
1082 fl6->daddr = p->raddr;
1083 fl6->flowi6_oif = p->link;
1084 fl6->flowlabel = 0;
1085 fl6->flowi6_proto = IPPROTO_GRE;
1086
1087 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1088 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1089 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1090 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1091
1092 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1093 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1094
1095 if (p->flags&IP6_TNL_F_CAP_XMIT &&
1096 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1097 dev->flags |= IFF_POINTOPOINT;
1098 else
1099 dev->flags &= ~IFF_POINTOPOINT;
1100}
1101
1102static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu,
1103 int t_hlen)
1104{
1105 const struct __ip6_tnl_parm *p = &t->parms;
1106 struct net_device *dev = t->dev;
1107
1108 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1109 int strict = (ipv6_addr_type(&p->raddr) &
1110 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1111
1112 struct rt6_info *rt = rt6_lookup(t->net,
1113 &p->raddr, &p->laddr,
1114 p->link, NULL, strict);
1115
1116 if (!rt)
1117 return;
1118
1119 if (rt->dst.dev) {
1120 dev->needed_headroom = rt->dst.dev->hard_header_len +
1121 t_hlen;
1122
1123 if (set_mtu) {
1124 dev->mtu = rt->dst.dev->mtu - t_hlen;
1125 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1126 dev->mtu -= 8;
1127 if (dev->type == ARPHRD_ETHER)
1128 dev->mtu -= ETH_HLEN;
1129
1130 if (dev->mtu < IPV6_MIN_MTU)
1131 dev->mtu = IPV6_MIN_MTU;
1132 }
1133 }
1134 ip6_rt_put(rt);
1135 }
1136}
1137
1138static int ip6gre_calc_hlen(struct ip6_tnl *tunnel)
1139{
1140 int t_hlen;
1141
1142 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1143 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1144
1145 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1146 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1147 return t_hlen;
1148}
1149
1150static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1151{
1152 ip6gre_tnl_link_config_common(t);
1153 ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t));
1154}
1155
1156static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t,
1157 const struct __ip6_tnl_parm *p)
1158{
1159 t->parms.laddr = p->laddr;
1160 t->parms.raddr = p->raddr;
1161 t->parms.flags = p->flags;
1162 t->parms.hop_limit = p->hop_limit;
1163 t->parms.encap_limit = p->encap_limit;
1164 t->parms.flowinfo = p->flowinfo;
1165 t->parms.link = p->link;
1166 t->parms.proto = p->proto;
1167 t->parms.i_key = p->i_key;
1168 t->parms.o_key = p->o_key;
1169 t->parms.i_flags = p->i_flags;
1170 t->parms.o_flags = p->o_flags;
1171 t->parms.fwmark = p->fwmark;
1172 t->parms.erspan_ver = p->erspan_ver;
1173 t->parms.index = p->index;
1174 t->parms.dir = p->dir;
1175 t->parms.hwid = p->hwid;
1176 dst_cache_reset(&t->dst_cache);
1177}
1178
1179static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
1180 int set_mtu)
1181{
1182 ip6gre_tnl_copy_tnl_parm(t, p);
1183 ip6gre_tnl_link_config(t, set_mtu);
1184 return 0;
1185}
1186
1187static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1188 const struct ip6_tnl_parm2 *u)
1189{
1190 p->laddr = u->laddr;
1191 p->raddr = u->raddr;
1192 p->flags = u->flags;
1193 p->hop_limit = u->hop_limit;
1194 p->encap_limit = u->encap_limit;
1195 p->flowinfo = u->flowinfo;
1196 p->link = u->link;
1197 p->i_key = u->i_key;
1198 p->o_key = u->o_key;
1199 p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
1200 p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
1201 memcpy(p->name, u->name, sizeof(u->name));
1202}
1203
1204static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1205 const struct __ip6_tnl_parm *p)
1206{
1207 u->proto = IPPROTO_GRE;
1208 u->laddr = p->laddr;
1209 u->raddr = p->raddr;
1210 u->flags = p->flags;
1211 u->hop_limit = p->hop_limit;
1212 u->encap_limit = p->encap_limit;
1213 u->flowinfo = p->flowinfo;
1214 u->link = p->link;
1215 u->i_key = p->i_key;
1216 u->o_key = p->o_key;
1217 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1218 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
1219 memcpy(u->name, p->name, sizeof(u->name));
1220}
1221
1222static int ip6gre_tunnel_ioctl(struct net_device *dev,
1223 struct ifreq *ifr, int cmd)
1224{
1225 int err = 0;
1226 struct ip6_tnl_parm2 p;
1227 struct __ip6_tnl_parm p1;
1228 struct ip6_tnl *t = netdev_priv(dev);
1229 struct net *net = t->net;
1230 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1231
1232 memset(&p1, 0, sizeof(p1));
1233
1234 switch (cmd) {
1235 case SIOCGETTUNNEL:
1236 if (dev == ign->fb_tunnel_dev) {
1237 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1238 err = -EFAULT;
1239 break;
1240 }
1241 ip6gre_tnl_parm_from_user(&p1, &p);
1242 t = ip6gre_tunnel_locate(net, &p1, 0);
1243 if (!t)
1244 t = netdev_priv(dev);
1245 }
1246 memset(&p, 0, sizeof(p));
1247 ip6gre_tnl_parm_to_user(&p, &t->parms);
1248 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1249 err = -EFAULT;
1250 break;
1251
1252 case SIOCADDTUNNEL:
1253 case SIOCCHGTUNNEL:
1254 err = -EPERM;
1255 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1256 goto done;
1257
1258 err = -EFAULT;
1259 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1260 goto done;
1261
1262 err = -EINVAL;
1263 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1264 goto done;
1265
1266 if (!(p.i_flags&GRE_KEY))
1267 p.i_key = 0;
1268 if (!(p.o_flags&GRE_KEY))
1269 p.o_key = 0;
1270
1271 ip6gre_tnl_parm_from_user(&p1, &p);
1272 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1273
1274 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1275 if (t) {
1276 if (t->dev != dev) {
1277 err = -EEXIST;
1278 break;
1279 }
1280 } else {
1281 t = netdev_priv(dev);
1282
1283 ip6gre_tunnel_unlink(ign, t);
1284 synchronize_net();
1285 ip6gre_tnl_change(t, &p1, 1);
1286 ip6gre_tunnel_link(ign, t);
1287 netdev_state_change(dev);
1288 }
1289 }
1290
1291 if (t) {
1292 err = 0;
1293
1294 memset(&p, 0, sizeof(p));
1295 ip6gre_tnl_parm_to_user(&p, &t->parms);
1296 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1297 err = -EFAULT;
1298 } else
1299 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1300 break;
1301
1302 case SIOCDELTUNNEL:
1303 err = -EPERM;
1304 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1305 goto done;
1306
1307 if (dev == ign->fb_tunnel_dev) {
1308 err = -EFAULT;
1309 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1310 goto done;
1311 err = -ENOENT;
1312 ip6gre_tnl_parm_from_user(&p1, &p);
1313 t = ip6gre_tunnel_locate(net, &p1, 0);
1314 if (!t)
1315 goto done;
1316 err = -EPERM;
1317 if (t == netdev_priv(ign->fb_tunnel_dev))
1318 goto done;
1319 dev = t->dev;
1320 }
1321 unregister_netdevice(dev);
1322 err = 0;
1323 break;
1324
1325 default:
1326 err = -EINVAL;
1327 }
1328
1329done:
1330 return err;
1331}
1332
1333static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1334 unsigned short type, const void *daddr,
1335 const void *saddr, unsigned int len)
1336{
1337 struct ip6_tnl *t = netdev_priv(dev);
1338 struct ipv6hdr *ipv6h;
1339 __be16 *p;
1340
1341 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
1342 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1343 t->fl.u.ip6.flowlabel,
1344 true, &t->fl.u.ip6));
1345 ipv6h->hop_limit = t->parms.hop_limit;
1346 ipv6h->nexthdr = NEXTHDR_GRE;
1347 ipv6h->saddr = t->parms.laddr;
1348 ipv6h->daddr = t->parms.raddr;
1349
1350 p = (__be16 *)(ipv6h + 1);
1351 p[0] = t->parms.o_flags;
1352 p[1] = htons(type);
1353
1354 /*
1355 * Set the source hardware address.
1356 */
1357
1358 if (saddr)
1359 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1360 if (daddr)
1361 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1362 if (!ipv6_addr_any(&ipv6h->daddr))
1363 return t->hlen;
1364
1365 return -t->hlen;
1366}
1367
1368static const struct header_ops ip6gre_header_ops = {
1369 .create = ip6gre_header,
1370};
1371
1372static const struct net_device_ops ip6gre_netdev_ops = {
1373 .ndo_init = ip6gre_tunnel_init,
1374 .ndo_uninit = ip6gre_tunnel_uninit,
1375 .ndo_start_xmit = ip6gre_tunnel_xmit,
1376 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
1377 .ndo_change_mtu = ip6_tnl_change_mtu,
1378 .ndo_get_stats64 = ip_tunnel_get_stats64,
1379 .ndo_get_iflink = ip6_tnl_get_iflink,
1380};
1381
1382static void ip6gre_dev_free(struct net_device *dev)
1383{
1384 struct ip6_tnl *t = netdev_priv(dev);
1385
1386 gro_cells_destroy(&t->gro_cells);
1387 dst_cache_destroy(&t->dst_cache);
1388 free_percpu(dev->tstats);
1389}
1390
1391static void ip6gre_tunnel_setup(struct net_device *dev)
1392{
1393 dev->netdev_ops = &ip6gre_netdev_ops;
1394 dev->needs_free_netdev = true;
1395 dev->priv_destructor = ip6gre_dev_free;
1396
1397 dev->type = ARPHRD_IP6GRE;
1398
1399 dev->flags |= IFF_NOARP;
1400 dev->addr_len = sizeof(struct in6_addr);
1401 netif_keep_dst(dev);
1402 /* This perm addr will be used as interface identifier by IPv6 */
1403 dev->addr_assign_type = NET_ADDR_RANDOM;
1404 eth_random_addr(dev->perm_addr);
1405}
1406
1407#define GRE6_FEATURES (NETIF_F_SG | \
1408 NETIF_F_FRAGLIST | \
1409 NETIF_F_HIGHDMA | \
1410 NETIF_F_HW_CSUM)
1411
1412static void ip6gre_tnl_init_features(struct net_device *dev)
1413{
1414 struct ip6_tnl *nt = netdev_priv(dev);
1415
1416 dev->features |= GRE6_FEATURES;
1417 dev->hw_features |= GRE6_FEATURES;
1418
1419 if (!(nt->parms.o_flags & TUNNEL_SEQ)) {
1420 /* TCP offload with GRE SEQ is not supported, nor
1421 * can we support 2 levels of outer headers requiring
1422 * an update.
1423 */
1424 if (!(nt->parms.o_flags & TUNNEL_CSUM) ||
1425 nt->encap.type == TUNNEL_ENCAP_NONE) {
1426 dev->features |= NETIF_F_GSO_SOFTWARE;
1427 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1428 }
1429
1430 /* Can use a lockless transmit, unless we generate
1431 * output sequences
1432 */
1433 dev->features |= NETIF_F_LLTX;
1434 }
1435}
1436
1437static int ip6gre_tunnel_init_common(struct net_device *dev)
1438{
1439 struct ip6_tnl *tunnel;
1440 int ret;
1441 int t_hlen;
1442
1443 tunnel = netdev_priv(dev);
1444
1445 tunnel->dev = dev;
1446 tunnel->net = dev_net(dev);
1447 strcpy(tunnel->parms.name, dev->name);
1448
1449 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1450 if (!dev->tstats)
1451 return -ENOMEM;
1452
1453 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1454 if (ret)
1455 goto cleanup_alloc_pcpu_stats;
1456
1457 ret = gro_cells_init(&tunnel->gro_cells, dev);
1458 if (ret)
1459 goto cleanup_dst_cache_init;
1460
1461 t_hlen = ip6gre_calc_hlen(tunnel);
1462 dev->mtu = ETH_DATA_LEN - t_hlen;
1463 if (dev->type == ARPHRD_ETHER)
1464 dev->mtu -= ETH_HLEN;
1465 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1466 dev->mtu -= 8;
1467
1468 if (tunnel->parms.collect_md) {
1469 dev->features |= NETIF_F_NETNS_LOCAL;
1470 netif_keep_dst(dev);
1471 }
1472 ip6gre_tnl_init_features(dev);
1473
1474 return 0;
1475
1476cleanup_dst_cache_init:
1477 dst_cache_destroy(&tunnel->dst_cache);
1478cleanup_alloc_pcpu_stats:
1479 free_percpu(dev->tstats);
1480 dev->tstats = NULL;
1481 return ret;
1482}
1483
1484static int ip6gre_tunnel_init(struct net_device *dev)
1485{
1486 struct ip6_tnl *tunnel;
1487 int ret;
1488
1489 ret = ip6gre_tunnel_init_common(dev);
1490 if (ret)
1491 return ret;
1492
1493 tunnel = netdev_priv(dev);
1494
1495 if (tunnel->parms.collect_md)
1496 return 0;
1497
1498 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1499 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1500
1501 if (ipv6_addr_any(&tunnel->parms.raddr))
1502 dev->header_ops = &ip6gre_header_ops;
1503
1504 return 0;
1505}
1506
1507static void ip6gre_fb_tunnel_init(struct net_device *dev)
1508{
1509 struct ip6_tnl *tunnel = netdev_priv(dev);
1510
1511 tunnel->dev = dev;
1512 tunnel->net = dev_net(dev);
1513 strcpy(tunnel->parms.name, dev->name);
1514
1515 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1516
1517 dev_hold(dev);
1518}
1519
1520static struct inet6_protocol ip6gre_protocol __read_mostly = {
1521 .handler = gre_rcv,
1522 .err_handler = ip6gre_err,
1523 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1524};
1525
1526static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1527{
1528 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1529 struct net_device *dev, *aux;
1530 int prio;
1531
1532 for_each_netdev_safe(net, dev, aux)
1533 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1534 dev->rtnl_link_ops == &ip6gre_tap_ops ||
1535 dev->rtnl_link_ops == &ip6erspan_tap_ops)
1536 unregister_netdevice_queue(dev, head);
1537
1538 for (prio = 0; prio < 4; prio++) {
1539 int h;
1540 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1541 struct ip6_tnl *t;
1542
1543 t = rtnl_dereference(ign->tunnels[prio][h]);
1544
1545 while (t) {
1546 /* If dev is in the same netns, it has already
1547 * been added to the list by the previous loop.
1548 */
1549 if (!net_eq(dev_net(t->dev), net))
1550 unregister_netdevice_queue(t->dev,
1551 head);
1552 t = rtnl_dereference(t->next);
1553 }
1554 }
1555 }
1556}
1557
1558static int __net_init ip6gre_init_net(struct net *net)
1559{
1560 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1561 int err;
1562
1563 if (!net_has_fallback_tunnels(net))
1564 return 0;
1565 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1566 NET_NAME_UNKNOWN,
1567 ip6gre_tunnel_setup);
1568 if (!ign->fb_tunnel_dev) {
1569 err = -ENOMEM;
1570 goto err_alloc_dev;
1571 }
1572 dev_net_set(ign->fb_tunnel_dev, net);
1573 /* FB netdevice is special: we have one, and only one per netns.
1574 * Allowing to move it to another netns is clearly unsafe.
1575 */
1576 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1577
1578
1579 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1580 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1581
1582 err = register_netdev(ign->fb_tunnel_dev);
1583 if (err)
1584 goto err_reg_dev;
1585
1586 rcu_assign_pointer(ign->tunnels_wc[0],
1587 netdev_priv(ign->fb_tunnel_dev));
1588 return 0;
1589
1590err_reg_dev:
1591 free_netdev(ign->fb_tunnel_dev);
1592err_alloc_dev:
1593 return err;
1594}
1595
1596static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list)
1597{
1598 struct net *net;
1599 LIST_HEAD(list);
1600
1601 rtnl_lock();
1602 list_for_each_entry(net, net_list, exit_list)
1603 ip6gre_destroy_tunnels(net, &list);
1604 unregister_netdevice_many(&list);
1605 rtnl_unlock();
1606}
1607
1608static struct pernet_operations ip6gre_net_ops = {
1609 .init = ip6gre_init_net,
1610 .exit_batch = ip6gre_exit_batch_net,
1611 .id = &ip6gre_net_id,
1612 .size = sizeof(struct ip6gre_net),
1613};
1614
1615static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1616 struct netlink_ext_ack *extack)
1617{
1618 __be16 flags;
1619
1620 if (!data)
1621 return 0;
1622
1623 flags = 0;
1624 if (data[IFLA_GRE_IFLAGS])
1625 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1626 if (data[IFLA_GRE_OFLAGS])
1627 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1628 if (flags & (GRE_VERSION|GRE_ROUTING))
1629 return -EINVAL;
1630
1631 return 0;
1632}
1633
1634static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1635 struct netlink_ext_ack *extack)
1636{
1637 struct in6_addr daddr;
1638
1639 if (tb[IFLA_ADDRESS]) {
1640 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1641 return -EINVAL;
1642 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1643 return -EADDRNOTAVAIL;
1644 }
1645
1646 if (!data)
1647 goto out;
1648
1649 if (data[IFLA_GRE_REMOTE]) {
1650 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1651 if (ipv6_addr_any(&daddr))
1652 return -EINVAL;
1653 }
1654
1655out:
1656 return ip6gre_tunnel_validate(tb, data, extack);
1657}
1658
1659static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1660 struct netlink_ext_ack *extack)
1661{
1662 __be16 flags = 0;
1663 int ret, ver = 0;
1664
1665 if (!data)
1666 return 0;
1667
1668 ret = ip6gre_tap_validate(tb, data, extack);
1669 if (ret)
1670 return ret;
1671
1672 /* ERSPAN should only have GRE sequence and key flag */
1673 if (data[IFLA_GRE_OFLAGS])
1674 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1675 if (data[IFLA_GRE_IFLAGS])
1676 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1677 if (!data[IFLA_GRE_COLLECT_METADATA] &&
1678 flags != (GRE_SEQ | GRE_KEY))
1679 return -EINVAL;
1680
1681 /* ERSPAN Session ID only has 10-bit. Since we reuse
1682 * 32-bit key field as ID, check it's range.
1683 */
1684 if (data[IFLA_GRE_IKEY] &&
1685 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1686 return -EINVAL;
1687
1688 if (data[IFLA_GRE_OKEY] &&
1689 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1690 return -EINVAL;
1691
1692 if (data[IFLA_GRE_ERSPAN_VER]) {
1693 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1694 if (ver != 1 && ver != 2)
1695 return -EINVAL;
1696 }
1697
1698 if (ver == 1) {
1699 if (data[IFLA_GRE_ERSPAN_INDEX]) {
1700 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1701
1702 if (index & ~INDEX_MASK)
1703 return -EINVAL;
1704 }
1705 } else if (ver == 2) {
1706 if (data[IFLA_GRE_ERSPAN_DIR]) {
1707 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1708
1709 if (dir & ~(DIR_MASK >> DIR_OFFSET))
1710 return -EINVAL;
1711 }
1712
1713 if (data[IFLA_GRE_ERSPAN_HWID]) {
1714 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1715
1716 if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1717 return -EINVAL;
1718 }
1719 }
1720
1721 return 0;
1722}
1723
1724static void ip6erspan_set_version(struct nlattr *data[],
1725 struct __ip6_tnl_parm *parms)
1726{
1727 if (!data)
1728 return;
1729
1730 parms->erspan_ver = 1;
1731 if (data[IFLA_GRE_ERSPAN_VER])
1732 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1733
1734 if (parms->erspan_ver == 1) {
1735 if (data[IFLA_GRE_ERSPAN_INDEX])
1736 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1737 } else if (parms->erspan_ver == 2) {
1738 if (data[IFLA_GRE_ERSPAN_DIR])
1739 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1740 if (data[IFLA_GRE_ERSPAN_HWID])
1741 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1742 }
1743}
1744
1745static void ip6gre_netlink_parms(struct nlattr *data[],
1746 struct __ip6_tnl_parm *parms)
1747{
1748 memset(parms, 0, sizeof(*parms));
1749
1750 if (!data)
1751 return;
1752
1753 if (data[IFLA_GRE_LINK])
1754 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1755
1756 if (data[IFLA_GRE_IFLAGS])
1757 parms->i_flags = gre_flags_to_tnl_flags(
1758 nla_get_be16(data[IFLA_GRE_IFLAGS]));
1759
1760 if (data[IFLA_GRE_OFLAGS])
1761 parms->o_flags = gre_flags_to_tnl_flags(
1762 nla_get_be16(data[IFLA_GRE_OFLAGS]));
1763
1764 if (data[IFLA_GRE_IKEY])
1765 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1766
1767 if (data[IFLA_GRE_OKEY])
1768 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1769
1770 if (data[IFLA_GRE_LOCAL])
1771 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1772
1773 if (data[IFLA_GRE_REMOTE])
1774 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1775
1776 if (data[IFLA_GRE_TTL])
1777 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1778
1779 if (data[IFLA_GRE_ENCAP_LIMIT])
1780 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1781
1782 if (data[IFLA_GRE_FLOWINFO])
1783 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1784
1785 if (data[IFLA_GRE_FLAGS])
1786 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1787
1788 if (data[IFLA_GRE_FWMARK])
1789 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1790
1791 if (data[IFLA_GRE_COLLECT_METADATA])
1792 parms->collect_md = true;
1793}
1794
1795static int ip6gre_tap_init(struct net_device *dev)
1796{
1797 int ret;
1798
1799 ret = ip6gre_tunnel_init_common(dev);
1800 if (ret)
1801 return ret;
1802
1803 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1804
1805 return 0;
1806}
1807
1808static const struct net_device_ops ip6gre_tap_netdev_ops = {
1809 .ndo_init = ip6gre_tap_init,
1810 .ndo_uninit = ip6gre_tunnel_uninit,
1811 .ndo_start_xmit = ip6gre_tunnel_xmit,
1812 .ndo_set_mac_address = eth_mac_addr,
1813 .ndo_validate_addr = eth_validate_addr,
1814 .ndo_change_mtu = ip6_tnl_change_mtu,
1815 .ndo_get_stats64 = ip_tunnel_get_stats64,
1816 .ndo_get_iflink = ip6_tnl_get_iflink,
1817};
1818
1819static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel)
1820{
1821 int t_hlen;
1822
1823 tunnel->tun_hlen = 8;
1824 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1825 erspan_hdr_len(tunnel->parms.erspan_ver);
1826
1827 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1828 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1829 return t_hlen;
1830}
1831
1832static int ip6erspan_tap_init(struct net_device *dev)
1833{
1834 struct ip6_tnl *tunnel;
1835 int t_hlen;
1836 int ret;
1837
1838 tunnel = netdev_priv(dev);
1839
1840 tunnel->dev = dev;
1841 tunnel->net = dev_net(dev);
1842 strcpy(tunnel->parms.name, dev->name);
1843
1844 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1845 if (!dev->tstats)
1846 return -ENOMEM;
1847
1848 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1849 if (ret)
1850 goto cleanup_alloc_pcpu_stats;
1851
1852 ret = gro_cells_init(&tunnel->gro_cells, dev);
1853 if (ret)
1854 goto cleanup_dst_cache_init;
1855
1856 t_hlen = ip6erspan_calc_hlen(tunnel);
1857 dev->mtu = ETH_DATA_LEN - t_hlen;
1858 if (dev->type == ARPHRD_ETHER)
1859 dev->mtu -= ETH_HLEN;
1860 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1861 dev->mtu -= 8;
1862
1863 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1864 ip6erspan_tnl_link_config(tunnel, 1);
1865
1866 return 0;
1867
1868cleanup_dst_cache_init:
1869 dst_cache_destroy(&tunnel->dst_cache);
1870cleanup_alloc_pcpu_stats:
1871 free_percpu(dev->tstats);
1872 dev->tstats = NULL;
1873 return ret;
1874}
1875
1876static const struct net_device_ops ip6erspan_netdev_ops = {
1877 .ndo_init = ip6erspan_tap_init,
1878 .ndo_uninit = ip6erspan_tunnel_uninit,
1879 .ndo_start_xmit = ip6erspan_tunnel_xmit,
1880 .ndo_set_mac_address = eth_mac_addr,
1881 .ndo_validate_addr = eth_validate_addr,
1882 .ndo_change_mtu = ip6_tnl_change_mtu,
1883 .ndo_get_stats64 = ip_tunnel_get_stats64,
1884 .ndo_get_iflink = ip6_tnl_get_iflink,
1885};
1886
1887static void ip6gre_tap_setup(struct net_device *dev)
1888{
1889
1890 ether_setup(dev);
1891
1892 dev->max_mtu = 0;
1893 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1894 dev->needs_free_netdev = true;
1895 dev->priv_destructor = ip6gre_dev_free;
1896
1897 dev->features |= NETIF_F_NETNS_LOCAL;
1898 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1899 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1900 netif_keep_dst(dev);
1901}
1902
1903static 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
1936static 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
1968out:
1969 return err;
1970}
1971
1972static 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
2001static struct ip6_tnl *
2002ip6gre_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
2035static 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
2055static 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
2064static 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
2106static 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
2163nla_put_failure:
2164 return -EMSGSIZE;
2165}
2166
2167static 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 = FIELD_SIZEOF(struct ipv6hdr, saddr) },
2174 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(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
2191static 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->features |= NETIF_F_NETNS_LOCAL;
2201 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2202 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2203 netif_keep_dst(dev);
2204}
2205
2206static int ip6erspan_newlink(struct net *src_net, struct net_device *dev,
2207 struct nlattr *tb[], struct nlattr *data[],
2208 struct netlink_ext_ack *extack)
2209{
2210 struct ip6_tnl *nt = netdev_priv(dev);
2211 struct net *net = dev_net(dev);
2212 struct ip6gre_net *ign;
2213 int err;
2214
2215 ip6gre_netlink_parms(data, &nt->parms);
2216 ip6erspan_set_version(data, &nt->parms);
2217 ign = net_generic(net, ip6gre_net_id);
2218
2219 if (nt->parms.collect_md) {
2220 if (rtnl_dereference(ign->collect_md_tun_erspan))
2221 return -EEXIST;
2222 } else {
2223 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2224 return -EEXIST;
2225 }
2226
2227 err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2228 if (!err) {
2229 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]);
2230 ip6erspan_tunnel_link_md(ign, nt);
2231 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2232 }
2233 return err;
2234}
2235
2236static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu)
2237{
2238 ip6gre_tnl_link_config_common(t);
2239 ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t));
2240}
2241
2242static int ip6erspan_tnl_change(struct ip6_tnl *t,
2243 const struct __ip6_tnl_parm *p, int set_mtu)
2244{
2245 ip6gre_tnl_copy_tnl_parm(t, p);
2246 ip6erspan_tnl_link_config(t, set_mtu);
2247 return 0;
2248}
2249
2250static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[],
2251 struct nlattr *data[],
2252 struct netlink_ext_ack *extack)
2253{
2254 struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2255 struct __ip6_tnl_parm p;
2256 struct ip6_tnl *t;
2257
2258 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2259 if (IS_ERR(t))
2260 return PTR_ERR(t);
2261
2262 ip6erspan_set_version(data, &p);
2263 ip6gre_tunnel_unlink_md(ign, t);
2264 ip6gre_tunnel_unlink(ign, t);
2265 ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]);
2266 ip6erspan_tunnel_link_md(ign, t);
2267 ip6gre_tunnel_link(ign, t);
2268 return 0;
2269}
2270
2271static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
2272 .kind = "ip6gre",
2273 .maxtype = IFLA_GRE_MAX,
2274 .policy = ip6gre_policy,
2275 .priv_size = sizeof(struct ip6_tnl),
2276 .setup = ip6gre_tunnel_setup,
2277 .validate = ip6gre_tunnel_validate,
2278 .newlink = ip6gre_newlink,
2279 .changelink = ip6gre_changelink,
2280 .dellink = ip6gre_dellink,
2281 .get_size = ip6gre_get_size,
2282 .fill_info = ip6gre_fill_info,
2283 .get_link_net = ip6_tnl_get_link_net,
2284};
2285
2286static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
2287 .kind = "ip6gretap",
2288 .maxtype = IFLA_GRE_MAX,
2289 .policy = ip6gre_policy,
2290 .priv_size = sizeof(struct ip6_tnl),
2291 .setup = ip6gre_tap_setup,
2292 .validate = ip6gre_tap_validate,
2293 .newlink = ip6gre_newlink,
2294 .changelink = ip6gre_changelink,
2295 .get_size = ip6gre_get_size,
2296 .fill_info = ip6gre_fill_info,
2297 .get_link_net = ip6_tnl_get_link_net,
2298};
2299
2300static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = {
2301 .kind = "ip6erspan",
2302 .maxtype = IFLA_GRE_MAX,
2303 .policy = ip6gre_policy,
2304 .priv_size = sizeof(struct ip6_tnl),
2305 .setup = ip6erspan_tap_setup,
2306 .validate = ip6erspan_tap_validate,
2307 .newlink = ip6erspan_newlink,
2308 .changelink = ip6erspan_changelink,
2309 .get_size = ip6gre_get_size,
2310 .fill_info = ip6gre_fill_info,
2311 .get_link_net = ip6_tnl_get_link_net,
2312};
2313
2314/*
2315 * And now the modules code and kernel interface.
2316 */
2317
2318static int __init ip6gre_init(void)
2319{
2320 int err;
2321
2322 pr_info("GRE over IPv6 tunneling driver\n");
2323
2324 err = register_pernet_device(&ip6gre_net_ops);
2325 if (err < 0)
2326 return err;
2327
2328 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
2329 if (err < 0) {
2330 pr_info("%s: can't add protocol\n", __func__);
2331 goto add_proto_failed;
2332 }
2333
2334 err = rtnl_link_register(&ip6gre_link_ops);
2335 if (err < 0)
2336 goto rtnl_link_failed;
2337
2338 err = rtnl_link_register(&ip6gre_tap_ops);
2339 if (err < 0)
2340 goto tap_ops_failed;
2341
2342 err = rtnl_link_register(&ip6erspan_tap_ops);
2343 if (err < 0)
2344 goto erspan_link_failed;
2345
2346out:
2347 return err;
2348
2349erspan_link_failed:
2350 rtnl_link_unregister(&ip6gre_tap_ops);
2351tap_ops_failed:
2352 rtnl_link_unregister(&ip6gre_link_ops);
2353rtnl_link_failed:
2354 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2355add_proto_failed:
2356 unregister_pernet_device(&ip6gre_net_ops);
2357 goto out;
2358}
2359
2360static void __exit ip6gre_fini(void)
2361{
2362 rtnl_link_unregister(&ip6gre_tap_ops);
2363 rtnl_link_unregister(&ip6gre_link_ops);
2364 rtnl_link_unregister(&ip6erspan_tap_ops);
2365 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2366 unregister_pernet_device(&ip6gre_net_ops);
2367}
2368
2369module_init(ip6gre_init);
2370module_exit(ip6gre_fini);
2371MODULE_LICENSE("GPL");
2372MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
2373MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
2374MODULE_ALIAS_RTNL_LINK("ip6gre");
2375MODULE_ALIAS_RTNL_LINK("ip6gretap");
2376MODULE_ALIAS_RTNL_LINK("ip6erspan");
2377MODULE_ALIAS_NETDEV("ip6gre0");