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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 ([email protected])
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/netdev_lock.h>
47#include <net/rtnetlink.h>
48
49#include <net/ipv6.h>
50#include <net/ip6_fib.h>
51#include <net/ip6_route.h>
52#include <net/ip6_tunnel.h>
53#include <net/gre.h>
54#include <net/erspan.h>
55#include <net/dst_metadata.h>
56
57
58static bool log_ecn_error = true;
59module_param(log_ecn_error, bool, 0644);
60MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
61
62#define IP6_GRE_HASH_SIZE_SHIFT 5
63#define IP6_GRE_HASH_SIZE (1 << IP6_GRE_HASH_SIZE_SHIFT)
64
65static unsigned int ip6gre_net_id __read_mostly;
66struct ip6gre_net {
67 struct ip6_tnl __rcu *tunnels[4][IP6_GRE_HASH_SIZE];
68
69 struct ip6_tnl __rcu *collect_md_tun;
70 struct ip6_tnl __rcu *collect_md_tun_erspan;
71 struct net_device *fb_tunnel_dev;
72};
73
74static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
75static struct rtnl_link_ops ip6gre_tap_ops __read_mostly;
76static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly;
77static int ip6gre_tunnel_init(struct net_device *dev);
78static void ip6gre_tunnel_setup(struct net_device *dev);
79static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
80static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
81static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu);
82
83/* Tunnel hash table */
84
85/*
86 4 hash tables:
87
88 3: (remote,local)
89 2: (remote,*)
90 1: (*,local)
91 0: (*,*)
92
93 We require exact key match i.e. if a key is present in packet
94 it will match only tunnel with the same key; if it is not present,
95 it will match only keyless tunnel.
96
97 All keysless packets, if not matched configured keyless tunnels
98 will match fallback tunnel.
99 */
100
101#define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(IP6_GRE_HASH_SIZE - 1))
102static u32 HASH_ADDR(const struct in6_addr *addr)
103{
104 u32 hash = ipv6_addr_hash(addr);
105
106 return hash_32(hash, IP6_GRE_HASH_SIZE_SHIFT);
107}
108
109#define tunnels_r_l tunnels[3]
110#define tunnels_r tunnels[2]
111#define tunnels_l tunnels[1]
112#define tunnels_wc tunnels[0]
113
114static bool ip6gre_tunnel_match(struct ip6_tnl *t, int dev_type, int link,
115 int *cand_score, struct ip6_tnl **ret)
116{
117 int score = 0;
118
119 if (t->dev->type != ARPHRD_IP6GRE &&
120 t->dev->type != dev_type)
121 return false;
122
123 if (t->parms.link != link)
124 score |= 1;
125 if (t->dev->type != dev_type)
126 score |= 2;
127 if (score == 0) {
128 *ret = t;
129 return true;
130 }
131
132 if (score < *cand_score) {
133 *ret = t;
134 *cand_score = score;
135 }
136 return false;
137}
138
139/* Given src, dst and key, find appropriate for input tunnel. */
140static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev,
141 const struct in6_addr *remote, const struct in6_addr *local,
142 __be32 key, __be16 gre_proto)
143{
144 struct net *net = dev_net(dev);
145 int link = dev->ifindex;
146 unsigned int h0 = HASH_ADDR(remote);
147 unsigned int h1 = HASH_KEY(key);
148 struct ip6_tnl *t, *cand = NULL;
149 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
150 int dev_type = (gre_proto == htons(ETH_P_TEB) ||
151 gre_proto == htons(ETH_P_ERSPAN) ||
152 gre_proto == htons(ETH_P_ERSPAN2)) ?
153 ARPHRD_ETHER : ARPHRD_IP6GRE;
154 struct net_device *ndev;
155 int cand_score = 4;
156
157 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
158 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
159 !ipv6_addr_equal(remote, &t->parms.raddr) ||
160 key != t->parms.i_key ||
161 !(t->dev->flags & IFF_UP))
162 continue;
163
164 if (ip6gre_tunnel_match(t, dev_type, link, &cand_score, &cand))
165 return cand;
166 }
167
168 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
169 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
170 key != t->parms.i_key ||
171 !(t->dev->flags & IFF_UP))
172 continue;
173
174 if (ip6gre_tunnel_match(t, dev_type, link, &cand_score, &cand))
175 return cand;
176 }
177
178 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
179 if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
180 (!ipv6_addr_equal(local, &t->parms.raddr) ||
181 !ipv6_addr_is_multicast(local))) ||
182 key != t->parms.i_key ||
183 !(t->dev->flags & IFF_UP))
184 continue;
185
186 if (ip6gre_tunnel_match(t, dev_type, link, &cand_score, &cand))
187 return cand;
188 }
189
190 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
191 if (t->parms.i_key != key ||
192 !(t->dev->flags & IFF_UP))
193 continue;
194
195 if (ip6gre_tunnel_match(t, dev_type, link, &cand_score, &cand))
196 return cand;
197 }
198
199 if (cand)
200 return cand;
201
202 if (gre_proto == htons(ETH_P_ERSPAN) ||
203 gre_proto == htons(ETH_P_ERSPAN2))
204 t = rcu_dereference(ign->collect_md_tun_erspan);
205 else
206 t = rcu_dereference(ign->collect_md_tun);
207
208 if (t && t->dev->flags & IFF_UP)
209 return t;
210
211 ndev = READ_ONCE(ign->fb_tunnel_dev);
212 if (ndev && ndev->flags & IFF_UP)
213 return netdev_priv(ndev);
214
215 return NULL;
216}
217
218static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
219 const struct __ip6_tnl_parm *p)
220{
221 const struct in6_addr *remote = &p->raddr;
222 const struct in6_addr *local = &p->laddr;
223 unsigned int h = HASH_KEY(p->i_key);
224 int prio = 0;
225
226 if (!ipv6_addr_any(local))
227 prio |= 1;
228 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
229 prio |= 2;
230 h ^= HASH_ADDR(remote);
231 }
232
233 return &ign->tunnels[prio][h];
234}
235
236static void ip6gre_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
237{
238 if (t->parms.collect_md)
239 rcu_assign_pointer(ign->collect_md_tun, t);
240}
241
242static void ip6erspan_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
243{
244 if (t->parms.collect_md)
245 rcu_assign_pointer(ign->collect_md_tun_erspan, t);
246}
247
248static void ip6gre_tunnel_unlink_md(struct ip6gre_net *ign, struct ip6_tnl *t)
249{
250 if (t->parms.collect_md)
251 rcu_assign_pointer(ign->collect_md_tun, NULL);
252}
253
254static void ip6erspan_tunnel_unlink_md(struct ip6gre_net *ign,
255 struct ip6_tnl *t)
256{
257 if (t->parms.collect_md)
258 rcu_assign_pointer(ign->collect_md_tun_erspan, NULL);
259}
260
261static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
262 const struct ip6_tnl *t)
263{
264 return __ip6gre_bucket(ign, &t->parms);
265}
266
267static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
268{
269 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
270
271 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
272 rcu_assign_pointer(*tp, t);
273}
274
275static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
276{
277 struct ip6_tnl __rcu **tp;
278 struct ip6_tnl *iter;
279
280 for (tp = ip6gre_bucket(ign, t);
281 (iter = rtnl_dereference(*tp)) != NULL;
282 tp = &iter->next) {
283 if (t == iter) {
284 rcu_assign_pointer(*tp, t->next);
285 break;
286 }
287 }
288}
289
290static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
291 const struct __ip6_tnl_parm *parms,
292 int type)
293{
294 const struct in6_addr *remote = &parms->raddr;
295 const struct in6_addr *local = &parms->laddr;
296 __be32 key = parms->i_key;
297 int link = parms->link;
298 struct ip6_tnl *t;
299 struct ip6_tnl __rcu **tp;
300 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
301
302 for (tp = __ip6gre_bucket(ign, parms);
303 (t = rtnl_dereference(*tp)) != NULL;
304 tp = &t->next)
305 if (ipv6_addr_equal(local, &t->parms.laddr) &&
306 ipv6_addr_equal(remote, &t->parms.raddr) &&
307 key == t->parms.i_key &&
308 link == t->parms.link &&
309 type == t->dev->type)
310 break;
311
312 return t;
313}
314
315static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
316 const struct __ip6_tnl_parm *parms, int create)
317{
318 struct ip6_tnl *t, *nt;
319 struct net_device *dev;
320 char name[IFNAMSIZ];
321 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
322
323 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
324 if (t && create)
325 return NULL;
326 if (t || !create)
327 return t;
328
329 if (parms->name[0]) {
330 if (!dev_valid_name(parms->name))
331 return NULL;
332 strscpy(name, parms->name);
333 } else {
334 strscpy(name, "ip6gre%d");
335 }
336 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
337 ip6gre_tunnel_setup);
338 if (!dev)
339 return NULL;
340
341 dev_net_set(dev, net);
342
343 nt = netdev_priv(dev);
344 nt->parms = *parms;
345 dev->rtnl_link_ops = &ip6gre_link_ops;
346
347 nt->dev = dev;
348 nt->net = dev_net(dev);
349
350 if (register_netdevice(dev) < 0)
351 goto failed_free;
352
353 ip6gre_tnl_link_config(nt, 1);
354 ip6gre_tunnel_link(ign, nt);
355 return nt;
356
357failed_free:
358 free_netdev(dev);
359 return NULL;
360}
361
362static void ip6erspan_tunnel_uninit(struct net_device *dev)
363{
364 struct ip6_tnl *t = netdev_priv(dev);
365 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
366
367 ip6erspan_tunnel_unlink_md(ign, t);
368 ip6gre_tunnel_unlink(ign, t);
369 dst_cache_reset(&t->dst_cache);
370 netdev_put(dev, &t->dev_tracker);
371}
372
373static void ip6gre_tunnel_uninit(struct net_device *dev)
374{
375 struct ip6_tnl *t = netdev_priv(dev);
376 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
377
378 ip6gre_tunnel_unlink_md(ign, t);
379 ip6gre_tunnel_unlink(ign, t);
380 if (ign->fb_tunnel_dev == dev)
381 WRITE_ONCE(ign->fb_tunnel_dev, NULL);
382 dst_cache_reset(&t->dst_cache);
383 netdev_put(dev, &t->dev_tracker);
384}
385
386
387static int ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
388 u8 type, u8 code, int offset, __be32 info)
389{
390 struct net *net = dev_net(skb->dev);
391 const struct ipv6hdr *ipv6h;
392 struct tnl_ptk_info tpi;
393 struct ip6_tnl *t;
394
395 if (gre_parse_header(skb, &tpi, NULL, htons(ETH_P_IPV6),
396 offset) < 0)
397 return -EINVAL;
398
399 ipv6h = (const struct ipv6hdr *)skb->data;
400 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
401 tpi.key, tpi.proto);
402 if (!t)
403 return -ENOENT;
404
405 switch (type) {
406 case ICMPV6_DEST_UNREACH:
407 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
408 t->parms.name);
409 if (code != ICMPV6_PORT_UNREACH)
410 break;
411 return 0;
412 case ICMPV6_TIME_EXCEED:
413 if (code == ICMPV6_EXC_HOPLIMIT) {
414 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
415 t->parms.name);
416 break;
417 }
418 return 0;
419 case ICMPV6_PARAMPROB: {
420 struct ipv6_tlv_tnl_enc_lim *tel;
421 __u32 teli;
422
423 teli = 0;
424 if (code == ICMPV6_HDR_FIELD)
425 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
426
427 if (teli && teli == be32_to_cpu(info) - 2) {
428 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
429 if (tel->encap_limit == 0) {
430 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
431 t->parms.name);
432 }
433 } else {
434 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
435 t->parms.name);
436 }
437 return 0;
438 }
439 case ICMPV6_PKT_TOOBIG:
440 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
441 return 0;
442 case NDISC_REDIRECT:
443 ip6_redirect(skb, net, skb->dev->ifindex, 0,
444 sock_net_uid(net, NULL));
445 return 0;
446 }
447
448 if (time_before(jiffies, READ_ONCE(t->err_time) + IP6TUNNEL_ERR_TIMEO))
449 WRITE_ONCE(t->err_count, READ_ONCE(t->err_count) + 1);
450 else
451 WRITE_ONCE(t->err_count, 1);
452 WRITE_ONCE(t->err_time, jiffies);
453
454 return 0;
455}
456
457static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
458{
459 const struct ipv6hdr *ipv6h;
460 struct ip6_tnl *tunnel;
461
462 ipv6h = ipv6_hdr(skb);
463 tunnel = ip6gre_tunnel_lookup(skb->dev,
464 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
465 tpi->proto);
466 if (tunnel) {
467 if (tunnel->parms.collect_md) {
468 IP_TUNNEL_DECLARE_FLAGS(flags);
469 struct metadata_dst *tun_dst;
470 __be64 tun_id;
471
472 ip_tunnel_flags_copy(flags, tpi->flags);
473 tun_id = key32_to_tunnel_id(tpi->key);
474
475 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0);
476 if (!tun_dst)
477 return PACKET_REJECT;
478
479 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
480 } else {
481 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
482 }
483
484 return PACKET_RCVD;
485 }
486
487 return PACKET_REJECT;
488}
489
490static int ip6erspan_rcv(struct sk_buff *skb,
491 struct tnl_ptk_info *tpi,
492 int gre_hdr_len)
493{
494 struct erspan_base_hdr *ershdr;
495 const struct ipv6hdr *ipv6h;
496 struct erspan_md2 *md2;
497 struct ip6_tnl *tunnel;
498 u8 ver;
499
500 if (unlikely(!pskb_may_pull(skb, sizeof(*ershdr))))
501 return PACKET_REJECT;
502
503 ipv6h = ipv6_hdr(skb);
504 ershdr = (struct erspan_base_hdr *)skb->data;
505 ver = ershdr->ver;
506
507 tunnel = ip6gre_tunnel_lookup(skb->dev,
508 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
509 tpi->proto);
510 if (tunnel) {
511 int len = erspan_hdr_len(ver);
512
513 if (unlikely(!pskb_may_pull(skb, len)))
514 return PACKET_REJECT;
515
516 if (__iptunnel_pull_header(skb, len,
517 htons(ETH_P_TEB),
518 false, false) < 0)
519 return PACKET_REJECT;
520
521 if (tunnel->parms.collect_md) {
522 struct erspan_metadata *pkt_md, *md;
523 IP_TUNNEL_DECLARE_FLAGS(flags);
524 struct metadata_dst *tun_dst;
525 struct ip_tunnel_info *info;
526 unsigned char *gh;
527 __be64 tun_id;
528
529 __set_bit(IP_TUNNEL_KEY_BIT, tpi->flags);
530 ip_tunnel_flags_copy(flags, tpi->flags);
531 tun_id = key32_to_tunnel_id(tpi->key);
532
533 tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id,
534 sizeof(*md));
535 if (!tun_dst)
536 return PACKET_REJECT;
537
538 /* MUST set options_len before referencing options */
539 info = &tun_dst->u.tun_info;
540 info->options_len = sizeof(*md);
541
542 /* skb can be uncloned in __iptunnel_pull_header, so
543 * old pkt_md is no longer valid and we need to reset
544 * it
545 */
546 gh = skb_network_header(skb) +
547 skb_network_header_len(skb);
548 pkt_md = (struct erspan_metadata *)(gh + gre_hdr_len +
549 sizeof(*ershdr));
550 md = ip_tunnel_info_opts(info);
551 md->version = ver;
552 md2 = &md->u.md2;
553 memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE :
554 ERSPAN_V2_MDSIZE);
555 __set_bit(IP_TUNNEL_ERSPAN_OPT_BIT,
556 info->key.tun_flags);
557
558 ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
559
560 } else {
561 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
562 }
563
564 return PACKET_RCVD;
565 }
566
567 return PACKET_REJECT;
568}
569
570static int gre_rcv(struct sk_buff *skb)
571{
572 struct tnl_ptk_info tpi;
573 bool csum_err = false;
574 int hdr_len;
575
576 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
577 if (hdr_len < 0)
578 goto drop;
579
580 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
581 goto drop;
582
583 if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) ||
584 tpi.proto == htons(ETH_P_ERSPAN2))) {
585 if (ip6erspan_rcv(skb, &tpi, hdr_len) == PACKET_RCVD)
586 return 0;
587 goto out;
588 }
589
590 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
591 return 0;
592
593out:
594 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
595drop:
596 dev_core_stats_rx_dropped_inc(skb->dev);
597 kfree_skb(skb);
598 return 0;
599}
600
601static int gre_handle_offloads(struct sk_buff *skb, bool csum)
602{
603 return iptunnel_handle_offloads(skb,
604 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
605}
606
607static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb,
608 struct net_device *dev,
609 struct flowi6 *fl6, __u8 *dsfield,
610 int *encap_limit)
611{
612 const struct iphdr *iph = ip_hdr(skb);
613 struct ip6_tnl *t = netdev_priv(dev);
614
615 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
616 *encap_limit = t->parms.encap_limit;
617
618 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
619
620 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
621 *dsfield = ipv4_get_dsfield(iph);
622 else
623 *dsfield = ip6_tclass(t->parms.flowinfo);
624
625 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
626 fl6->flowi6_mark = skb->mark;
627 else
628 fl6->flowi6_mark = t->parms.fwmark;
629
630 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
631}
632
633static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb,
634 struct net_device *dev,
635 struct flowi6 *fl6, __u8 *dsfield,
636 int *encap_limit)
637{
638 struct ipv6hdr *ipv6h;
639 struct ip6_tnl *t = netdev_priv(dev);
640 __u16 offset;
641
642 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
643 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
644 ipv6h = ipv6_hdr(skb);
645
646 if (offset > 0) {
647 struct ipv6_tlv_tnl_enc_lim *tel;
648
649 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
650 if (tel->encap_limit == 0) {
651 icmpv6_ndo_send(skb, ICMPV6_PARAMPROB,
652 ICMPV6_HDR_FIELD, offset + 2);
653 return -1;
654 }
655 *encap_limit = tel->encap_limit - 1;
656 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
657 *encap_limit = t->parms.encap_limit;
658 }
659
660 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
661
662 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
663 *dsfield = ipv6_get_dsfield(ipv6h);
664 else
665 *dsfield = ip6_tclass(t->parms.flowinfo);
666
667 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
668 fl6->flowlabel |= ip6_flowlabel(ipv6h);
669
670 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
671 fl6->flowi6_mark = skb->mark;
672 else
673 fl6->flowi6_mark = t->parms.fwmark;
674
675 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
676
677 return 0;
678}
679
680static int prepare_ip6gre_xmit_other(struct sk_buff *skb,
681 struct net_device *dev,
682 struct flowi6 *fl6, __u8 *dsfield,
683 int *encap_limit)
684{
685 struct ip6_tnl *t = netdev_priv(dev);
686
687 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
688 *encap_limit = t->parms.encap_limit;
689
690 memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
691
692 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
693 *dsfield = 0;
694 else
695 *dsfield = ip6_tclass(t->parms.flowinfo);
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 struct ip_tunnel_info *skb_tunnel_info_txcheck(struct sk_buff *skb)
708{
709 struct ip_tunnel_info *tun_info;
710
711 tun_info = skb_tunnel_info(skb);
712 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX)))
713 return ERR_PTR(-EINVAL);
714
715 return tun_info;
716}
717
718static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
719 struct net_device *dev, __u8 dsfield,
720 struct flowi6 *fl6, int encap_limit,
721 __u32 *pmtu, __be16 proto)
722{
723 struct ip6_tnl *tunnel = netdev_priv(dev);
724 IP_TUNNEL_DECLARE_FLAGS(flags);
725 __be16 protocol;
726
727 if (dev->type == ARPHRD_ETHER)
728 IPCB(skb)->flags = 0;
729
730 if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
731 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
732 else
733 fl6->daddr = tunnel->parms.raddr;
734
735 /* Push GRE header. */
736 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
737
738 if (tunnel->parms.collect_md) {
739 struct ip_tunnel_info *tun_info;
740 const struct ip_tunnel_key *key;
741 int tun_hlen;
742
743 tun_info = skb_tunnel_info_txcheck(skb);
744 if (IS_ERR(tun_info) ||
745 unlikely(ip_tunnel_info_af(tun_info) != AF_INET6))
746 return -EINVAL;
747
748 key = &tun_info->key;
749 memset(fl6, 0, sizeof(*fl6));
750 fl6->flowi6_proto = IPPROTO_GRE;
751 fl6->daddr = key->u.ipv6.dst;
752 fl6->flowlabel = key->label;
753 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
754 fl6->fl6_gre_key = tunnel_id_to_key32(key->tun_id);
755
756 dsfield = key->tos;
757 ip_tunnel_flags_zero(flags);
758 __set_bit(IP_TUNNEL_CSUM_BIT, flags);
759 __set_bit(IP_TUNNEL_KEY_BIT, flags);
760 __set_bit(IP_TUNNEL_SEQ_BIT, flags);
761 ip_tunnel_flags_and(flags, flags, key->tun_flags);
762 tun_hlen = gre_calc_hlen(flags);
763
764 if (skb_cow_head(skb, dev->needed_headroom ?: tun_hlen + tunnel->encap_hlen))
765 return -ENOMEM;
766
767 gre_build_header(skb, tun_hlen,
768 flags, protocol,
769 tunnel_id_to_key32(tun_info->key.tun_id),
770 test_bit(IP_TUNNEL_SEQ_BIT, flags) ?
771 htonl(atomic_fetch_inc(&tunnel->o_seqno)) :
772 0);
773
774 } else {
775 if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen))
776 return -ENOMEM;
777
778 ip_tunnel_flags_copy(flags, tunnel->parms.o_flags);
779
780 gre_build_header(skb, tunnel->tun_hlen, flags,
781 protocol, tunnel->parms.o_key,
782 test_bit(IP_TUNNEL_SEQ_BIT, flags) ?
783 htonl(atomic_fetch_inc(&tunnel->o_seqno)) :
784 0);
785 }
786
787 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
788 NEXTHDR_GRE);
789}
790
791static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
792{
793 struct ip6_tnl *t = netdev_priv(dev);
794 int encap_limit = -1;
795 struct flowi6 fl6;
796 __u8 dsfield = 0;
797 __u32 mtu;
798 int err;
799
800 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
801
802 if (!t->parms.collect_md)
803 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
804 &dsfield, &encap_limit);
805
806 err = gre_handle_offloads(skb, test_bit(IP_TUNNEL_CSUM_BIT,
807 t->parms.o_flags));
808 if (err)
809 return -1;
810
811 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
812 skb->protocol);
813 if (err != 0) {
814 /* XXX: send ICMP error even if DF is not set. */
815 if (err == -EMSGSIZE)
816 icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
817 htonl(mtu));
818 return -1;
819 }
820
821 return 0;
822}
823
824static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
825{
826 struct ip6_tnl *t = netdev_priv(dev);
827 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
828 int encap_limit = -1;
829 struct flowi6 fl6;
830 __u8 dsfield = 0;
831 __u32 mtu;
832 int err;
833
834 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
835 return -1;
836
837 if (!t->parms.collect_md &&
838 prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
839 return -1;
840
841 if (gre_handle_offloads(skb, test_bit(IP_TUNNEL_CSUM_BIT,
842 t->parms.o_flags)))
843 return -1;
844
845 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
846 &mtu, skb->protocol);
847 if (err != 0) {
848 if (err == -EMSGSIZE)
849 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
850 return -1;
851 }
852
853 return 0;
854}
855
856static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
857{
858 struct ip6_tnl *t = netdev_priv(dev);
859 int encap_limit = -1;
860 struct flowi6 fl6;
861 __u8 dsfield = 0;
862 __u32 mtu;
863 int err;
864
865 if (!t->parms.collect_md &&
866 prepare_ip6gre_xmit_other(skb, dev, &fl6, &dsfield, &encap_limit))
867 return -1;
868
869 err = gre_handle_offloads(skb, test_bit(IP_TUNNEL_CSUM_BIT,
870 t->parms.o_flags));
871 if (err)
872 return err;
873 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, skb->protocol);
874
875 return err;
876}
877
878static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
879 struct net_device *dev)
880{
881 struct ip_tunnel_info *tun_info = NULL;
882 struct ip6_tnl *t = netdev_priv(dev);
883 __be16 payload_protocol;
884 int ret;
885
886 if (!pskb_inet_may_pull(skb))
887 goto tx_err;
888
889 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
890 goto tx_err;
891
892 if (t->parms.collect_md)
893 tun_info = skb_tunnel_info_txcheck(skb);
894
895 payload_protocol = skb_protocol(skb, true);
896 switch (payload_protocol) {
897 case htons(ETH_P_IP):
898 ret = ip6gre_xmit_ipv4(skb, dev);
899 break;
900 case htons(ETH_P_IPV6):
901 ret = ip6gre_xmit_ipv6(skb, dev);
902 break;
903 default:
904 ret = ip6gre_xmit_other(skb, dev);
905 break;
906 }
907
908 if (ret < 0)
909 goto tx_err;
910
911 return NETDEV_TX_OK;
912
913tx_err:
914 if (!IS_ERR(tun_info))
915 DEV_STATS_INC(dev, tx_errors);
916 DEV_STATS_INC(dev, tx_dropped);
917 kfree_skb(skb);
918 return NETDEV_TX_OK;
919}
920
921static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
922 struct net_device *dev)
923{
924 struct ip_tunnel_info *tun_info = NULL;
925 struct ip6_tnl *t = netdev_priv(dev);
926 IP_TUNNEL_DECLARE_FLAGS(flags) = { };
927 bool truncate = false;
928 int encap_limit = -1;
929 __u8 dsfield = false;
930 struct flowi6 fl6;
931 int err = -EINVAL;
932 __be16 proto;
933 __u32 mtu;
934 int nhoff;
935
936 if (!pskb_inet_may_pull(skb))
937 goto tx_err;
938
939 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
940 goto tx_err;
941
942 if (gre_handle_offloads(skb, false))
943 goto tx_err;
944
945 if (skb->len > dev->mtu + dev->hard_header_len) {
946 if (pskb_trim(skb, dev->mtu + dev->hard_header_len))
947 goto tx_err;
948 truncate = true;
949 }
950
951 nhoff = skb_network_offset(skb);
952 if (skb->protocol == htons(ETH_P_IP) &&
953 (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff))
954 truncate = true;
955
956 if (skb->protocol == htons(ETH_P_IPV6)) {
957 int thoff;
958
959 if (skb_transport_header_was_set(skb))
960 thoff = skb_transport_offset(skb);
961 else
962 thoff = nhoff + sizeof(struct ipv6hdr);
963 if (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff)
964 truncate = true;
965 }
966
967 if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen))
968 goto tx_err;
969
970 IPCB(skb)->flags = 0;
971
972 /* For collect_md mode, derive fl6 from the tunnel key,
973 * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}.
974 */
975 if (t->parms.collect_md) {
976 const struct ip_tunnel_key *key;
977 struct erspan_metadata *md;
978 __be32 tun_id;
979
980 tun_info = skb_tunnel_info_txcheck(skb);
981 if (IS_ERR(tun_info) ||
982 unlikely(ip_tunnel_info_af(tun_info) != AF_INET6))
983 goto tx_err;
984
985 key = &tun_info->key;
986 memset(&fl6, 0, sizeof(fl6));
987 fl6.flowi6_proto = IPPROTO_GRE;
988 fl6.daddr = key->u.ipv6.dst;
989 fl6.flowlabel = key->label;
990 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
991 fl6.fl6_gre_key = tunnel_id_to_key32(key->tun_id);
992
993 dsfield = key->tos;
994 if (!test_bit(IP_TUNNEL_ERSPAN_OPT_BIT,
995 tun_info->key.tun_flags))
996 goto tx_err;
997 if (tun_info->options_len < sizeof(*md))
998 goto tx_err;
999 md = ip_tunnel_info_opts(tun_info);
1000
1001 tun_id = tunnel_id_to_key32(key->tun_id);
1002 if (md->version == 1) {
1003 erspan_build_header(skb,
1004 ntohl(tun_id),
1005 ntohl(md->u.index), truncate,
1006 false);
1007 proto = htons(ETH_P_ERSPAN);
1008 } else if (md->version == 2) {
1009 erspan_build_header_v2(skb,
1010 ntohl(tun_id),
1011 md->u.md2.dir,
1012 get_hwid(&md->u.md2),
1013 truncate, false);
1014 proto = htons(ETH_P_ERSPAN2);
1015 } else {
1016 goto tx_err;
1017 }
1018 } else {
1019 switch (skb->protocol) {
1020 case htons(ETH_P_IP):
1021 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1022 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
1023 &dsfield, &encap_limit);
1024 break;
1025 case htons(ETH_P_IPV6):
1026 if (ipv6_addr_equal(&t->parms.raddr, &ipv6_hdr(skb)->saddr))
1027 goto tx_err;
1028 if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
1029 &dsfield, &encap_limit))
1030 goto tx_err;
1031 break;
1032 default:
1033 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1034 break;
1035 }
1036
1037 if (t->parms.erspan_ver == 1) {
1038 erspan_build_header(skb, ntohl(t->parms.o_key),
1039 t->parms.index,
1040 truncate, false);
1041 proto = htons(ETH_P_ERSPAN);
1042 } else if (t->parms.erspan_ver == 2) {
1043 erspan_build_header_v2(skb, ntohl(t->parms.o_key),
1044 t->parms.dir,
1045 t->parms.hwid,
1046 truncate, false);
1047 proto = htons(ETH_P_ERSPAN2);
1048 } else {
1049 goto tx_err;
1050 }
1051
1052 fl6.daddr = t->parms.raddr;
1053 }
1054
1055 /* Push GRE header. */
1056 __set_bit(IP_TUNNEL_SEQ_BIT, flags);
1057 gre_build_header(skb, 8, flags, proto, 0,
1058 htonl(atomic_fetch_inc(&t->o_seqno)));
1059
1060 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1061 NEXTHDR_GRE);
1062 if (err != 0) {
1063 /* XXX: send ICMP error even if DF is not set. */
1064 if (err == -EMSGSIZE) {
1065 if (skb->protocol == htons(ETH_P_IP))
1066 icmp_ndo_send(skb, ICMP_DEST_UNREACH,
1067 ICMP_FRAG_NEEDED, htonl(mtu));
1068 else
1069 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1070 }
1071
1072 goto tx_err;
1073 }
1074 return NETDEV_TX_OK;
1075
1076tx_err:
1077 if (!IS_ERR(tun_info))
1078 DEV_STATS_INC(dev, tx_errors);
1079 DEV_STATS_INC(dev, tx_dropped);
1080 kfree_skb(skb);
1081 return NETDEV_TX_OK;
1082}
1083
1084static void ip6gre_tnl_link_config_common(struct ip6_tnl *t)
1085{
1086 struct net_device *dev = t->dev;
1087 struct __ip6_tnl_parm *p = &t->parms;
1088 struct flowi6 *fl6 = &t->fl.u.ip6;
1089
1090 if (dev->type != ARPHRD_ETHER) {
1091 __dev_addr_set(dev, &p->laddr, sizeof(struct in6_addr));
1092 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1093 }
1094
1095 /* Set up flowi template */
1096 fl6->saddr = p->laddr;
1097 fl6->daddr = p->raddr;
1098 fl6->flowi6_oif = p->link;
1099 fl6->flowlabel = 0;
1100 fl6->flowi6_proto = IPPROTO_GRE;
1101 fl6->fl6_gre_key = t->parms.o_key;
1102
1103 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1104 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1105 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1106 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1107
1108 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1109 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1110
1111 if (p->flags&IP6_TNL_F_CAP_XMIT &&
1112 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1113 dev->flags |= IFF_POINTOPOINT;
1114 else
1115 dev->flags &= ~IFF_POINTOPOINT;
1116}
1117
1118static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu,
1119 int t_hlen)
1120{
1121 const struct __ip6_tnl_parm *p = &t->parms;
1122 struct net_device *dev = t->dev;
1123
1124 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1125 int strict = (ipv6_addr_type(&p->raddr) &
1126 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1127
1128 struct rt6_info *rt = rt6_lookup(t->net,
1129 &p->raddr, &p->laddr,
1130 p->link, NULL, strict);
1131
1132 if (!rt)
1133 return;
1134
1135 if (rt->dst.dev) {
1136 unsigned int headroom;
1137
1138 headroom = rt->dst.dev->hard_header_len + t_hlen;
1139 headroom = ip_tunnel_limit_headroom(headroom);
1140 dev->needed_headroom = headroom;
1141
1142 if (set_mtu) {
1143 int mtu = rt->dst.dev->mtu - t_hlen;
1144
1145 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1146 mtu -= 8;
1147 if (dev->type == ARPHRD_ETHER)
1148 mtu -= ETH_HLEN;
1149
1150 if (mtu < IPV6_MIN_MTU)
1151 mtu = IPV6_MIN_MTU;
1152 WRITE_ONCE(dev->mtu, mtu);
1153 }
1154 }
1155 ip6_rt_put(rt);
1156 }
1157}
1158
1159static int ip6gre_calc_hlen(struct ip6_tnl *tunnel)
1160{
1161 int t_hlen;
1162
1163 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1164 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1165
1166 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1167
1168 if (tunnel->dev->header_ops && tunnel->dev->type == ARPHRD_IP6GRE)
1169 tunnel->dev->hard_header_len = t_hlen;
1170 else
1171 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1172
1173 return t_hlen;
1174}
1175
1176static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1177{
1178 ip6gre_tnl_link_config_common(t);
1179 ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t));
1180}
1181
1182static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t,
1183 const struct __ip6_tnl_parm *p)
1184{
1185 t->parms.laddr = p->laddr;
1186 t->parms.raddr = p->raddr;
1187 t->parms.flags = p->flags;
1188 t->parms.hop_limit = p->hop_limit;
1189 t->parms.encap_limit = p->encap_limit;
1190 t->parms.flowinfo = p->flowinfo;
1191 t->parms.link = p->link;
1192 t->parms.proto = p->proto;
1193 t->parms.i_key = p->i_key;
1194 t->parms.o_key = p->o_key;
1195 ip_tunnel_flags_copy(t->parms.i_flags, p->i_flags);
1196 ip_tunnel_flags_copy(t->parms.o_flags, p->o_flags);
1197 t->parms.fwmark = p->fwmark;
1198 t->parms.erspan_ver = p->erspan_ver;
1199 t->parms.index = p->index;
1200 t->parms.dir = p->dir;
1201 t->parms.hwid = p->hwid;
1202 dst_cache_reset(&t->dst_cache);
1203}
1204
1205static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
1206 int set_mtu)
1207{
1208 ip6gre_tnl_copy_tnl_parm(t, p);
1209 ip6gre_tnl_link_config(t, set_mtu);
1210 return 0;
1211}
1212
1213static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1214 const struct ip6_tnl_parm2 *u)
1215{
1216 p->laddr = u->laddr;
1217 p->raddr = u->raddr;
1218 p->flags = u->flags;
1219 p->hop_limit = u->hop_limit;
1220 p->encap_limit = u->encap_limit;
1221 p->flowinfo = u->flowinfo;
1222 p->link = u->link;
1223 p->i_key = u->i_key;
1224 p->o_key = u->o_key;
1225 gre_flags_to_tnl_flags(p->i_flags, u->i_flags);
1226 gre_flags_to_tnl_flags(p->o_flags, u->o_flags);
1227 memcpy(p->name, u->name, sizeof(u->name));
1228}
1229
1230static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1231 const struct __ip6_tnl_parm *p)
1232{
1233 u->proto = IPPROTO_GRE;
1234 u->laddr = p->laddr;
1235 u->raddr = p->raddr;
1236 u->flags = p->flags;
1237 u->hop_limit = p->hop_limit;
1238 u->encap_limit = p->encap_limit;
1239 u->flowinfo = p->flowinfo;
1240 u->link = p->link;
1241 u->i_key = p->i_key;
1242 u->o_key = p->o_key;
1243 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1244 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
1245 memcpy(u->name, p->name, sizeof(u->name));
1246}
1247
1248static int ip6gre_tunnel_siocdevprivate(struct net_device *dev,
1249 struct ifreq *ifr, void __user *data,
1250 int cmd)
1251{
1252 int err = 0;
1253 struct ip6_tnl_parm2 p;
1254 struct __ip6_tnl_parm p1;
1255 struct ip6_tnl *t = netdev_priv(dev);
1256 struct net *net = t->net;
1257 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1258
1259 memset(&p1, 0, sizeof(p1));
1260
1261 switch (cmd) {
1262 case SIOCGETTUNNEL:
1263 if (dev == ign->fb_tunnel_dev) {
1264 if (copy_from_user(&p, data, sizeof(p))) {
1265 err = -EFAULT;
1266 break;
1267 }
1268 ip6gre_tnl_parm_from_user(&p1, &p);
1269 t = ip6gre_tunnel_locate(net, &p1, 0);
1270 if (!t)
1271 t = netdev_priv(dev);
1272 }
1273 memset(&p, 0, sizeof(p));
1274 ip6gre_tnl_parm_to_user(&p, &t->parms);
1275 if (copy_to_user(data, &p, sizeof(p)))
1276 err = -EFAULT;
1277 break;
1278
1279 case SIOCADDTUNNEL:
1280 case SIOCCHGTUNNEL:
1281 err = -EPERM;
1282 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1283 goto done;
1284
1285 err = -EFAULT;
1286 if (copy_from_user(&p, data, sizeof(p)))
1287 goto done;
1288
1289 err = -EINVAL;
1290 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1291 goto done;
1292
1293 if (!(p.i_flags&GRE_KEY))
1294 p.i_key = 0;
1295 if (!(p.o_flags&GRE_KEY))
1296 p.o_key = 0;
1297
1298 ip6gre_tnl_parm_from_user(&p1, &p);
1299 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1300
1301 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1302 if (t) {
1303 if (t->dev != dev) {
1304 err = -EEXIST;
1305 break;
1306 }
1307 } else {
1308 t = netdev_priv(dev);
1309
1310 ip6gre_tunnel_unlink(ign, t);
1311 synchronize_net();
1312 ip6gre_tnl_change(t, &p1, 1);
1313 ip6gre_tunnel_link(ign, t);
1314 netdev_state_change(dev);
1315 }
1316 }
1317
1318 if (t) {
1319 err = 0;
1320
1321 memset(&p, 0, sizeof(p));
1322 ip6gre_tnl_parm_to_user(&p, &t->parms);
1323 if (copy_to_user(data, &p, sizeof(p)))
1324 err = -EFAULT;
1325 } else
1326 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1327 break;
1328
1329 case SIOCDELTUNNEL:
1330 err = -EPERM;
1331 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1332 goto done;
1333
1334 if (dev == ign->fb_tunnel_dev) {
1335 err = -EFAULT;
1336 if (copy_from_user(&p, data, sizeof(p)))
1337 goto done;
1338 err = -ENOENT;
1339 ip6gre_tnl_parm_from_user(&p1, &p);
1340 t = ip6gre_tunnel_locate(net, &p1, 0);
1341 if (!t)
1342 goto done;
1343 err = -EPERM;
1344 if (t == netdev_priv(ign->fb_tunnel_dev))
1345 goto done;
1346 dev = t->dev;
1347 }
1348 unregister_netdevice(dev);
1349 err = 0;
1350 break;
1351
1352 default:
1353 err = -EINVAL;
1354 }
1355
1356done:
1357 return err;
1358}
1359
1360static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1361 unsigned short type, const void *daddr,
1362 const void *saddr, unsigned int len)
1363{
1364 struct ip6_tnl *t = netdev_priv(dev);
1365 struct ipv6hdr *ipv6h;
1366 int needed;
1367 __be16 *p;
1368
1369 needed = t->hlen + sizeof(*ipv6h);
1370 if (skb_headroom(skb) < needed &&
1371 pskb_expand_head(skb, HH_DATA_ALIGN(needed - skb_headroom(skb)),
1372 0, GFP_ATOMIC))
1373 return -needed;
1374
1375 ipv6h = skb_push(skb, needed);
1376 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1377 t->fl.u.ip6.flowlabel,
1378 true, &t->fl.u.ip6));
1379 ipv6h->hop_limit = t->parms.hop_limit;
1380 ipv6h->nexthdr = NEXTHDR_GRE;
1381 ipv6h->saddr = t->parms.laddr;
1382 ipv6h->daddr = t->parms.raddr;
1383
1384 p = (__be16 *)(ipv6h + 1);
1385 p[0] = ip_tunnel_flags_to_be16(t->parms.o_flags);
1386 p[1] = htons(type);
1387
1388 /*
1389 * Set the source hardware address.
1390 */
1391
1392 if (saddr)
1393 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1394 if (daddr)
1395 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1396 if (!ipv6_addr_any(&ipv6h->daddr))
1397 return t->hlen;
1398
1399 return -t->hlen;
1400}
1401
1402static const struct header_ops ip6gre_header_ops = {
1403 .create = ip6gre_header,
1404};
1405
1406static const struct net_device_ops ip6gre_netdev_ops = {
1407 .ndo_init = ip6gre_tunnel_init,
1408 .ndo_uninit = ip6gre_tunnel_uninit,
1409 .ndo_start_xmit = ip6gre_tunnel_xmit,
1410 .ndo_siocdevprivate = ip6gre_tunnel_siocdevprivate,
1411 .ndo_change_mtu = ip6_tnl_change_mtu,
1412 .ndo_get_iflink = ip6_tnl_get_iflink,
1413};
1414
1415static void ip6gre_dev_free(struct net_device *dev)
1416{
1417 struct ip6_tnl *t = netdev_priv(dev);
1418
1419 gro_cells_destroy(&t->gro_cells);
1420 dst_cache_destroy(&t->dst_cache);
1421}
1422
1423static void ip6gre_tunnel_setup(struct net_device *dev)
1424{
1425 dev->netdev_ops = &ip6gre_netdev_ops;
1426 dev->needs_free_netdev = true;
1427 dev->priv_destructor = ip6gre_dev_free;
1428
1429 dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
1430 dev->type = ARPHRD_IP6GRE;
1431
1432 dev->flags |= IFF_NOARP;
1433 dev->addr_len = sizeof(struct in6_addr);
1434 netif_keep_dst(dev);
1435 /* This perm addr will be used as interface identifier by IPv6 */
1436 dev->addr_assign_type = NET_ADDR_RANDOM;
1437 eth_random_addr(dev->perm_addr);
1438}
1439
1440#define GRE6_FEATURES (NETIF_F_SG | \
1441 NETIF_F_FRAGLIST | \
1442 NETIF_F_HIGHDMA | \
1443 NETIF_F_HW_CSUM)
1444
1445static void ip6gre_tnl_init_features(struct net_device *dev)
1446{
1447 struct ip6_tnl *nt = netdev_priv(dev);
1448
1449 dev->features |= GRE6_FEATURES;
1450 dev->hw_features |= GRE6_FEATURES;
1451
1452 dev->lltx = true;
1453
1454 /* TCP offload with GRE SEQ is not supported, nor can we support 2
1455 * levels of outer headers requiring an update.
1456 */
1457 if (test_bit(IP_TUNNEL_SEQ_BIT, nt->parms.o_flags))
1458 return;
1459 if (test_bit(IP_TUNNEL_CSUM_BIT, nt->parms.o_flags) &&
1460 nt->encap.type != TUNNEL_ENCAP_NONE)
1461 return;
1462
1463 dev->features |= NETIF_F_GSO_SOFTWARE;
1464 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1465}
1466
1467static int ip6gre_tunnel_init_common(struct net_device *dev)
1468{
1469 struct ip6_tnl *tunnel;
1470 int ret;
1471 int t_hlen;
1472
1473 tunnel = netdev_priv(dev);
1474
1475 tunnel->dev = dev;
1476 strscpy(tunnel->parms.name, dev->name);
1477
1478 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1479 if (ret)
1480 return ret;
1481
1482 ret = gro_cells_init(&tunnel->gro_cells, dev);
1483 if (ret)
1484 goto cleanup_dst_cache_init;
1485
1486 t_hlen = ip6gre_calc_hlen(tunnel);
1487 dev->mtu = ETH_DATA_LEN - t_hlen;
1488 if (dev->type == ARPHRD_ETHER)
1489 dev->mtu -= ETH_HLEN;
1490 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1491 dev->mtu -= 8;
1492
1493 if (tunnel->parms.collect_md) {
1494 netif_keep_dst(dev);
1495 }
1496 ip6gre_tnl_init_features(dev);
1497
1498 netdev_hold(dev, &tunnel->dev_tracker, GFP_KERNEL);
1499 netdev_lockdep_set_classes(dev);
1500 return 0;
1501
1502cleanup_dst_cache_init:
1503 dst_cache_destroy(&tunnel->dst_cache);
1504 return ret;
1505}
1506
1507static int ip6gre_tunnel_init(struct net_device *dev)
1508{
1509 struct ip6_tnl *tunnel;
1510 int ret;
1511
1512 ret = ip6gre_tunnel_init_common(dev);
1513 if (ret)
1514 return ret;
1515
1516 tunnel = netdev_priv(dev);
1517
1518 if (tunnel->parms.collect_md)
1519 return 0;
1520
1521 __dev_addr_set(dev, &tunnel->parms.laddr, sizeof(struct in6_addr));
1522 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1523
1524 if (ipv6_addr_any(&tunnel->parms.raddr))
1525 dev->header_ops = &ip6gre_header_ops;
1526
1527 return 0;
1528}
1529
1530static void ip6gre_fb_tunnel_init(struct net_device *dev)
1531{
1532 struct ip6_tnl *tunnel = netdev_priv(dev);
1533
1534 tunnel->dev = dev;
1535 tunnel->net = dev_net(dev);
1536 strscpy(tunnel->parms.name, dev->name);
1537
1538 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1539}
1540
1541static struct inet6_protocol ip6gre_protocol __read_mostly = {
1542 .handler = gre_rcv,
1543 .err_handler = ip6gre_err,
1544 .flags = INET6_PROTO_FINAL,
1545};
1546
1547static void __net_exit ip6gre_exit_rtnl_net(struct net *net, struct list_head *head)
1548{
1549 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1550 struct net_device *dev, *aux;
1551 int prio;
1552
1553 for_each_netdev_safe(net, dev, aux)
1554 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1555 dev->rtnl_link_ops == &ip6gre_tap_ops ||
1556 dev->rtnl_link_ops == &ip6erspan_tap_ops)
1557 unregister_netdevice_queue(dev, head);
1558
1559 for (prio = 0; prio < 4; prio++) {
1560 int h;
1561 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1562 struct ip6_tnl *t;
1563
1564 t = rtnl_net_dereference(net, ign->tunnels[prio][h]);
1565
1566 while (t) {
1567 /* If dev is in the same netns, it has already
1568 * been added to the list by the previous loop.
1569 */
1570 if (!net_eq(dev_net(t->dev), net))
1571 unregister_netdevice_queue(t->dev, head);
1572
1573 t = rtnl_net_dereference(net, t->next);
1574 }
1575 }
1576 }
1577}
1578
1579static int __net_init ip6gre_init_net(struct net *net)
1580{
1581 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1582 struct net_device *ndev;
1583 int err;
1584
1585 if (!net_has_fallback_tunnels(net))
1586 return 0;
1587 ndev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1588 NET_NAME_UNKNOWN, ip6gre_tunnel_setup);
1589 if (!ndev) {
1590 err = -ENOMEM;
1591 goto err_alloc_dev;
1592 }
1593 ign->fb_tunnel_dev = ndev;
1594 dev_net_set(ign->fb_tunnel_dev, net);
1595 /* FB netdevice is special: we have one, and only one per netns.
1596 * Allowing to move it to another netns is clearly unsafe.
1597 */
1598 ign->fb_tunnel_dev->netns_immutable = true;
1599
1600 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1601 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1602
1603 err = register_netdev(ign->fb_tunnel_dev);
1604 if (err)
1605 goto err_reg_dev;
1606
1607 rcu_assign_pointer(ign->tunnels_wc[0],
1608 netdev_priv(ign->fb_tunnel_dev));
1609 return 0;
1610
1611err_reg_dev:
1612 free_netdev(ndev);
1613err_alloc_dev:
1614 return err;
1615}
1616
1617static struct pernet_operations ip6gre_net_ops = {
1618 .init = ip6gre_init_net,
1619 .exit_rtnl = ip6gre_exit_rtnl_net,
1620 .id = &ip6gre_net_id,
1621 .size = sizeof(struct ip6gre_net),
1622};
1623
1624static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1625 struct netlink_ext_ack *extack)
1626{
1627 __be16 flags;
1628
1629 if (!data)
1630 return 0;
1631
1632 flags = 0;
1633 if (data[IFLA_GRE_IFLAGS])
1634 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1635 if (data[IFLA_GRE_OFLAGS])
1636 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1637 if (flags & (GRE_VERSION|GRE_ROUTING))
1638 return -EINVAL;
1639
1640 return 0;
1641}
1642
1643static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1644 struct netlink_ext_ack *extack)
1645{
1646 struct in6_addr daddr;
1647
1648 if (tb[IFLA_ADDRESS]) {
1649 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1650 return -EINVAL;
1651 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1652 return -EADDRNOTAVAIL;
1653 }
1654
1655 if (!data)
1656 goto out;
1657
1658 if (data[IFLA_GRE_REMOTE]) {
1659 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1660 if (ipv6_addr_any(&daddr))
1661 return -EINVAL;
1662 }
1663
1664out:
1665 return ip6gre_tunnel_validate(tb, data, extack);
1666}
1667
1668static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1669 struct netlink_ext_ack *extack)
1670{
1671 __be16 flags = 0;
1672 int ret, ver = 0;
1673
1674 if (!data)
1675 return 0;
1676
1677 ret = ip6gre_tap_validate(tb, data, extack);
1678 if (ret)
1679 return ret;
1680
1681 /* ERSPAN should only have GRE sequence and key flag */
1682 if (data[IFLA_GRE_OFLAGS])
1683 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1684 if (data[IFLA_GRE_IFLAGS])
1685 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1686 if (!data[IFLA_GRE_COLLECT_METADATA] &&
1687 flags != (GRE_SEQ | GRE_KEY))
1688 return -EINVAL;
1689
1690 /* ERSPAN Session ID only has 10-bit. Since we reuse
1691 * 32-bit key field as ID, check it's range.
1692 */
1693 if (data[IFLA_GRE_IKEY] &&
1694 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1695 return -EINVAL;
1696
1697 if (data[IFLA_GRE_OKEY] &&
1698 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1699 return -EINVAL;
1700
1701 if (data[IFLA_GRE_ERSPAN_VER]) {
1702 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1703 if (ver != 1 && ver != 2)
1704 return -EINVAL;
1705 }
1706
1707 if (ver == 1) {
1708 if (data[IFLA_GRE_ERSPAN_INDEX]) {
1709 u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1710
1711 if (index & ~INDEX_MASK)
1712 return -EINVAL;
1713 }
1714 } else if (ver == 2) {
1715 if (data[IFLA_GRE_ERSPAN_DIR]) {
1716 u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1717
1718 if (dir & ~(DIR_MASK >> DIR_OFFSET))
1719 return -EINVAL;
1720 }
1721
1722 if (data[IFLA_GRE_ERSPAN_HWID]) {
1723 u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1724
1725 if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1726 return -EINVAL;
1727 }
1728 }
1729
1730 return 0;
1731}
1732
1733static void ip6erspan_set_version(struct nlattr *data[],
1734 struct __ip6_tnl_parm *parms)
1735{
1736 if (!data)
1737 return;
1738
1739 parms->erspan_ver = 1;
1740 if (data[IFLA_GRE_ERSPAN_VER])
1741 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1742
1743 if (parms->erspan_ver == 1) {
1744 if (data[IFLA_GRE_ERSPAN_INDEX])
1745 parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1746 } else if (parms->erspan_ver == 2) {
1747 if (data[IFLA_GRE_ERSPAN_DIR])
1748 parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1749 if (data[IFLA_GRE_ERSPAN_HWID])
1750 parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1751 }
1752}
1753
1754static void ip6gre_netlink_parms(struct nlattr *data[],
1755 struct __ip6_tnl_parm *parms)
1756{
1757 memset(parms, 0, sizeof(*parms));
1758
1759 if (!data)
1760 return;
1761
1762 if (data[IFLA_GRE_LINK])
1763 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1764
1765 if (data[IFLA_GRE_IFLAGS])
1766 gre_flags_to_tnl_flags(parms->i_flags,
1767 nla_get_be16(data[IFLA_GRE_IFLAGS]));
1768
1769 if (data[IFLA_GRE_OFLAGS])
1770 gre_flags_to_tnl_flags(parms->o_flags,
1771 nla_get_be16(data[IFLA_GRE_OFLAGS]));
1772
1773 if (data[IFLA_GRE_IKEY])
1774 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1775
1776 if (data[IFLA_GRE_OKEY])
1777 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1778
1779 if (data[IFLA_GRE_LOCAL])
1780 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1781
1782 if (data[IFLA_GRE_REMOTE])
1783 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1784
1785 if (data[IFLA_GRE_TTL])
1786 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1787
1788 if (data[IFLA_GRE_ENCAP_LIMIT])
1789 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1790
1791 if (data[IFLA_GRE_FLOWINFO])
1792 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1793
1794 if (data[IFLA_GRE_FLAGS])
1795 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1796
1797 if (data[IFLA_GRE_FWMARK])
1798 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1799
1800 if (data[IFLA_GRE_COLLECT_METADATA])
1801 parms->collect_md = true;
1802}
1803
1804static int ip6gre_tap_init(struct net_device *dev)
1805{
1806 int ret;
1807
1808 ret = ip6gre_tunnel_init_common(dev);
1809 if (ret)
1810 return ret;
1811
1812 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1813
1814 return 0;
1815}
1816
1817static const struct net_device_ops ip6gre_tap_netdev_ops = {
1818 .ndo_init = ip6gre_tap_init,
1819 .ndo_uninit = ip6gre_tunnel_uninit,
1820 .ndo_start_xmit = ip6gre_tunnel_xmit,
1821 .ndo_set_mac_address = eth_mac_addr,
1822 .ndo_validate_addr = eth_validate_addr,
1823 .ndo_change_mtu = ip6_tnl_change_mtu,
1824 .ndo_get_iflink = ip6_tnl_get_iflink,
1825};
1826
1827static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel)
1828{
1829 int t_hlen;
1830
1831 tunnel->tun_hlen = 8;
1832 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1833 erspan_hdr_len(tunnel->parms.erspan_ver);
1834
1835 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1836 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1837 return t_hlen;
1838}
1839
1840static int ip6erspan_tap_init(struct net_device *dev)
1841{
1842 struct ip6_tnl *tunnel;
1843 int t_hlen;
1844 int ret;
1845
1846 tunnel = netdev_priv(dev);
1847
1848 tunnel->dev = dev;
1849 strscpy(tunnel->parms.name, dev->name);
1850
1851 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1852 if (ret)
1853 return ret;
1854
1855 ret = gro_cells_init(&tunnel->gro_cells, dev);
1856 if (ret)
1857 goto cleanup_dst_cache_init;
1858
1859 t_hlen = ip6erspan_calc_hlen(tunnel);
1860 dev->mtu = ETH_DATA_LEN - t_hlen;
1861 if (dev->type == ARPHRD_ETHER)
1862 dev->mtu -= ETH_HLEN;
1863 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1864 dev->mtu -= 8;
1865
1866 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1867 ip6erspan_tnl_link_config(tunnel, 1);
1868
1869 netdev_hold(dev, &tunnel->dev_tracker, GFP_KERNEL);
1870 netdev_lockdep_set_classes(dev);
1871 return 0;
1872
1873cleanup_dst_cache_init:
1874 dst_cache_destroy(&tunnel->dst_cache);
1875 return ret;
1876}
1877
1878static const struct net_device_ops ip6erspan_netdev_ops = {
1879 .ndo_init = ip6erspan_tap_init,
1880 .ndo_uninit = ip6erspan_tunnel_uninit,
1881 .ndo_start_xmit = ip6erspan_tunnel_xmit,
1882 .ndo_set_mac_address = eth_mac_addr,
1883 .ndo_validate_addr = eth_validate_addr,
1884 .ndo_change_mtu = ip6_tnl_change_mtu,
1885 .ndo_get_iflink = ip6_tnl_get_iflink,
1886};
1887
1888static void ip6gre_tap_setup(struct net_device *dev)
1889{
1890
1891 ether_setup(dev);
1892
1893 dev->max_mtu = 0;
1894 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1895 dev->needs_free_netdev = true;
1896 dev->priv_destructor = ip6gre_dev_free;
1897
1898 dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
1899 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1900 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1901 netif_keep_dst(dev);
1902}
1903
1904static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1905 struct ip_tunnel_encap *ipencap)
1906{
1907 bool ret = false;
1908
1909 memset(ipencap, 0, sizeof(*ipencap));
1910
1911 if (!data)
1912 return ret;
1913
1914 if (data[IFLA_GRE_ENCAP_TYPE]) {
1915 ret = true;
1916 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1917 }
1918
1919 if (data[IFLA_GRE_ENCAP_FLAGS]) {
1920 ret = true;
1921 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1922 }
1923
1924 if (data[IFLA_GRE_ENCAP_SPORT]) {
1925 ret = true;
1926 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1927 }
1928
1929 if (data[IFLA_GRE_ENCAP_DPORT]) {
1930 ret = true;
1931 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1932 }
1933
1934 return ret;
1935}
1936
1937static int ip6gre_newlink_common(struct net *link_net, struct net_device *dev,
1938 struct nlattr *tb[], struct nlattr *data[],
1939 struct netlink_ext_ack *extack)
1940{
1941 struct ip6_tnl *nt;
1942 struct ip_tunnel_encap ipencap;
1943 int err;
1944
1945 nt = netdev_priv(dev);
1946
1947 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1948 int err = ip6_tnl_encap_setup(nt, &ipencap);
1949
1950 if (err < 0)
1951 return err;
1952 }
1953
1954 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1955 eth_hw_addr_random(dev);
1956
1957 nt->dev = dev;
1958 nt->net = link_net;
1959
1960 err = register_netdevice(dev);
1961 if (err)
1962 goto out;
1963
1964 if (tb[IFLA_MTU])
1965 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1966
1967out:
1968 return err;
1969}
1970
1971static int ip6gre_newlink(struct net_device *dev,
1972 struct rtnl_newlink_params *params,
1973 struct netlink_ext_ack *extack)
1974{
1975 struct net *net = params->link_net ? : dev_net(dev);
1976 struct ip6_tnl *nt = netdev_priv(dev);
1977 struct nlattr **data = params->data;
1978 struct nlattr **tb = params->tb;
1979 struct ip6gre_net *ign;
1980 int err;
1981
1982 ip6gre_netlink_parms(data, &nt->parms);
1983 ign = net_generic(net, ip6gre_net_id);
1984
1985 if (nt->parms.collect_md) {
1986 if (rtnl_dereference(ign->collect_md_tun))
1987 return -EEXIST;
1988 } else {
1989 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1990 return -EEXIST;
1991 }
1992
1993 err = ip6gre_newlink_common(net, dev, tb, data, extack);
1994 if (!err) {
1995 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1996 ip6gre_tunnel_link_md(ign, nt);
1997 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
1998 }
1999 return err;
2000}
2001
2002static struct ip6_tnl *
2003ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[],
2004 struct nlattr *data[], struct __ip6_tnl_parm *p_p,
2005 struct netlink_ext_ack *extack)
2006{
2007 struct ip6_tnl *t, *nt = netdev_priv(dev);
2008 struct net *net = nt->net;
2009 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2010 struct ip_tunnel_encap ipencap;
2011
2012 if (dev == ign->fb_tunnel_dev)
2013 return ERR_PTR(-EINVAL);
2014
2015 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
2016 int err = ip6_tnl_encap_setup(nt, &ipencap);
2017
2018 if (err < 0)
2019 return ERR_PTR(err);
2020 }
2021
2022 ip6gre_netlink_parms(data, p_p);
2023
2024 t = ip6gre_tunnel_locate(net, p_p, 0);
2025
2026 if (t) {
2027 if (t->dev != dev)
2028 return ERR_PTR(-EEXIST);
2029 } else {
2030 t = nt;
2031 }
2032
2033 return t;
2034}
2035
2036static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
2037 struct nlattr *data[],
2038 struct netlink_ext_ack *extack)
2039{
2040 struct ip6_tnl *t = netdev_priv(dev);
2041 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
2042 struct __ip6_tnl_parm p;
2043
2044 if (!rtnl_dev_link_net_capable(dev, t->net))
2045 return -EPERM;
2046
2047 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2048 if (IS_ERR(t))
2049 return PTR_ERR(t);
2050
2051 ip6gre_tunnel_unlink_md(ign, t);
2052 ip6gre_tunnel_unlink(ign, t);
2053 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
2054 ip6gre_tunnel_link_md(ign, t);
2055 ip6gre_tunnel_link(ign, t);
2056 return 0;
2057}
2058
2059static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
2060{
2061 struct net *net = dev_net(dev);
2062 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2063
2064 if (dev != ign->fb_tunnel_dev)
2065 unregister_netdevice_queue(dev, head);
2066}
2067
2068static size_t ip6gre_get_size(const struct net_device *dev)
2069{
2070 return
2071 /* IFLA_GRE_LINK */
2072 nla_total_size(4) +
2073 /* IFLA_GRE_IFLAGS */
2074 nla_total_size(2) +
2075 /* IFLA_GRE_OFLAGS */
2076 nla_total_size(2) +
2077 /* IFLA_GRE_IKEY */
2078 nla_total_size(4) +
2079 /* IFLA_GRE_OKEY */
2080 nla_total_size(4) +
2081 /* IFLA_GRE_LOCAL */
2082 nla_total_size(sizeof(struct in6_addr)) +
2083 /* IFLA_GRE_REMOTE */
2084 nla_total_size(sizeof(struct in6_addr)) +
2085 /* IFLA_GRE_TTL */
2086 nla_total_size(1) +
2087 /* IFLA_GRE_ENCAP_LIMIT */
2088 nla_total_size(1) +
2089 /* IFLA_GRE_FLOWINFO */
2090 nla_total_size(4) +
2091 /* IFLA_GRE_FLAGS */
2092 nla_total_size(4) +
2093 /* IFLA_GRE_ENCAP_TYPE */
2094 nla_total_size(2) +
2095 /* IFLA_GRE_ENCAP_FLAGS */
2096 nla_total_size(2) +
2097 /* IFLA_GRE_ENCAP_SPORT */
2098 nla_total_size(2) +
2099 /* IFLA_GRE_ENCAP_DPORT */
2100 nla_total_size(2) +
2101 /* IFLA_GRE_COLLECT_METADATA */
2102 nla_total_size(0) +
2103 /* IFLA_GRE_FWMARK */
2104 nla_total_size(4) +
2105 /* IFLA_GRE_ERSPAN_INDEX */
2106 nla_total_size(4) +
2107 0;
2108}
2109
2110static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
2111{
2112 const struct ip6_tnl *t = netdev_priv(dev);
2113 const struct __ip6_tnl_parm *p = &t->parms;
2114 IP_TUNNEL_DECLARE_FLAGS(o_flags);
2115
2116 ip_tunnel_flags_copy(o_flags, p->o_flags);
2117
2118 if (p->erspan_ver == 1 || p->erspan_ver == 2) {
2119 if (!p->collect_md)
2120 __set_bit(IP_TUNNEL_KEY_BIT, o_flags);
2121
2122 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
2123 goto nla_put_failure;
2124
2125 if (p->erspan_ver == 1) {
2126 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2127 goto nla_put_failure;
2128 } else {
2129 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
2130 goto nla_put_failure;
2131 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
2132 goto nla_put_failure;
2133 }
2134 }
2135
2136 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
2137 nla_put_be16(skb, IFLA_GRE_IFLAGS,
2138 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
2139 nla_put_be16(skb, IFLA_GRE_OFLAGS,
2140 gre_tnl_flags_to_gre_flags(o_flags)) ||
2141 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
2142 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
2143 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
2144 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
2145 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
2146 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
2147 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
2148 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
2149 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark))
2150 goto nla_put_failure;
2151
2152 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
2153 t->encap.type) ||
2154 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
2155 t->encap.sport) ||
2156 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
2157 t->encap.dport) ||
2158 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
2159 t->encap.flags))
2160 goto nla_put_failure;
2161
2162 if (p->collect_md) {
2163 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
2164 goto nla_put_failure;
2165 }
2166
2167 return 0;
2168
2169nla_put_failure:
2170 return -EMSGSIZE;
2171}
2172
2173static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
2174 [IFLA_GRE_LINK] = { .type = NLA_U32 },
2175 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
2176 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
2177 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
2178 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
2179 [IFLA_GRE_LOCAL] = { .len = sizeof_field(struct ipv6hdr, saddr) },
2180 [IFLA_GRE_REMOTE] = { .len = sizeof_field(struct ipv6hdr, daddr) },
2181 [IFLA_GRE_TTL] = { .type = NLA_U8 },
2182 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
2183 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
2184 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
2185 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 },
2186 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
2187 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
2188 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
2189 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
2190 [IFLA_GRE_FWMARK] = { .type = NLA_U32 },
2191 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
2192 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 },
2193 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 },
2194 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 },
2195};
2196
2197static void ip6erspan_tap_setup(struct net_device *dev)
2198{
2199 ether_setup(dev);
2200
2201 dev->max_mtu = 0;
2202 dev->netdev_ops = &ip6erspan_netdev_ops;
2203 dev->needs_free_netdev = true;
2204 dev->priv_destructor = ip6gre_dev_free;
2205
2206 dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
2207 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2208 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2209 netif_keep_dst(dev);
2210}
2211
2212static int ip6erspan_newlink(struct net_device *dev,
2213 struct rtnl_newlink_params *params,
2214 struct netlink_ext_ack *extack)
2215{
2216 struct net *net = params->link_net ? : dev_net(dev);
2217 struct ip6_tnl *nt = netdev_priv(dev);
2218 struct nlattr **data = params->data;
2219 struct nlattr **tb = params->tb;
2220 struct ip6gre_net *ign;
2221 int err;
2222
2223 ip6gre_netlink_parms(data, &nt->parms);
2224 ip6erspan_set_version(data, &nt->parms);
2225 ign = net_generic(net, ip6gre_net_id);
2226
2227 if (nt->parms.collect_md) {
2228 if (rtnl_dereference(ign->collect_md_tun_erspan))
2229 return -EEXIST;
2230 } else {
2231 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2232 return -EEXIST;
2233 }
2234
2235 err = ip6gre_newlink_common(net, dev, tb, data, extack);
2236 if (!err) {
2237 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]);
2238 ip6erspan_tunnel_link_md(ign, nt);
2239 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2240 }
2241 return err;
2242}
2243
2244static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu)
2245{
2246 ip6gre_tnl_link_config_common(t);
2247 ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t));
2248}
2249
2250static int ip6erspan_tnl_change(struct ip6_tnl *t,
2251 const struct __ip6_tnl_parm *p, int set_mtu)
2252{
2253 ip6gre_tnl_copy_tnl_parm(t, p);
2254 ip6erspan_tnl_link_config(t, set_mtu);
2255 return 0;
2256}
2257
2258static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[],
2259 struct nlattr *data[],
2260 struct netlink_ext_ack *extack)
2261{
2262 struct ip6_tnl *t = netdev_priv(dev);
2263 struct __ip6_tnl_parm p;
2264 struct ip6gre_net *ign;
2265
2266 if (!rtnl_dev_link_net_capable(dev, t->net))
2267 return -EPERM;
2268
2269 ign = net_generic(t->net, ip6gre_net_id);
2270 t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2271 if (IS_ERR(t))
2272 return PTR_ERR(t);
2273
2274 ip6erspan_set_version(data, &p);
2275 ip6erspan_tunnel_unlink_md(ign, t);
2276 ip6gre_tunnel_unlink(ign, t);
2277 ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]);
2278 ip6erspan_tunnel_link_md(ign, t);
2279 ip6gre_tunnel_link(ign, t);
2280 return 0;
2281}
2282
2283static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
2284 .kind = "ip6gre",
2285 .maxtype = IFLA_GRE_MAX,
2286 .policy = ip6gre_policy,
2287 .priv_size = sizeof(struct ip6_tnl),
2288 .setup = ip6gre_tunnel_setup,
2289 .validate = ip6gre_tunnel_validate,
2290 .newlink = ip6gre_newlink,
2291 .changelink = ip6gre_changelink,
2292 .dellink = ip6gre_dellink,
2293 .get_size = ip6gre_get_size,
2294 .fill_info = ip6gre_fill_info,
2295 .get_link_net = ip6_tnl_get_link_net,
2296};
2297
2298static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
2299 .kind = "ip6gretap",
2300 .maxtype = IFLA_GRE_MAX,
2301 .policy = ip6gre_policy,
2302 .priv_size = sizeof(struct ip6_tnl),
2303 .setup = ip6gre_tap_setup,
2304 .validate = ip6gre_tap_validate,
2305 .newlink = ip6gre_newlink,
2306 .changelink = ip6gre_changelink,
2307 .get_size = ip6gre_get_size,
2308 .fill_info = ip6gre_fill_info,
2309 .get_link_net = ip6_tnl_get_link_net,
2310};
2311
2312static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = {
2313 .kind = "ip6erspan",
2314 .maxtype = IFLA_GRE_MAX,
2315 .policy = ip6gre_policy,
2316 .priv_size = sizeof(struct ip6_tnl),
2317 .setup = ip6erspan_tap_setup,
2318 .validate = ip6erspan_tap_validate,
2319 .newlink = ip6erspan_newlink,
2320 .changelink = ip6erspan_changelink,
2321 .get_size = ip6gre_get_size,
2322 .fill_info = ip6gre_fill_info,
2323 .get_link_net = ip6_tnl_get_link_net,
2324};
2325
2326/*
2327 * And now the modules code and kernel interface.
2328 */
2329
2330static int __init ip6gre_init(void)
2331{
2332 int err;
2333
2334 pr_info("GRE over IPv6 tunneling driver\n");
2335
2336 err = register_pernet_device(&ip6gre_net_ops);
2337 if (err < 0)
2338 return err;
2339
2340 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
2341 if (err < 0) {
2342 pr_info("%s: can't add protocol\n", __func__);
2343 goto add_proto_failed;
2344 }
2345
2346 err = rtnl_link_register(&ip6gre_link_ops);
2347 if (err < 0)
2348 goto rtnl_link_failed;
2349
2350 err = rtnl_link_register(&ip6gre_tap_ops);
2351 if (err < 0)
2352 goto tap_ops_failed;
2353
2354 err = rtnl_link_register(&ip6erspan_tap_ops);
2355 if (err < 0)
2356 goto erspan_link_failed;
2357
2358out:
2359 return err;
2360
2361erspan_link_failed:
2362 rtnl_link_unregister(&ip6gre_tap_ops);
2363tap_ops_failed:
2364 rtnl_link_unregister(&ip6gre_link_ops);
2365rtnl_link_failed:
2366 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2367add_proto_failed:
2368 unregister_pernet_device(&ip6gre_net_ops);
2369 goto out;
2370}
2371
2372static void __exit ip6gre_fini(void)
2373{
2374 rtnl_link_unregister(&ip6gre_tap_ops);
2375 rtnl_link_unregister(&ip6gre_link_ops);
2376 rtnl_link_unregister(&ip6erspan_tap_ops);
2377 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2378 unregister_pernet_device(&ip6gre_net_ops);
2379}
2380
2381module_init(ip6gre_init);
2382module_exit(ip6gre_fini);
2383MODULE_LICENSE("GPL");
2384MODULE_AUTHOR("D. Kozlov <[email protected]>");
2385MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
2386MODULE_ALIAS_RTNL_LINK("ip6gre");
2387MODULE_ALIAS_RTNL_LINK("ip6gretap");
2388MODULE_ALIAS_RTNL_LINK("ip6erspan");
2389MODULE_ALIAS_NETDEV("ip6gre0");