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ip6_gre: update dst pmtu if dev mtu has been updated by toobig in __gre6_xmit
[mirror_ubuntu-focal-kernel.git] / net / ipv6 / ip6_gre.c
1 /*
2 * GRE over IPv6 protocol decoder.
3 *
4 * Authors: Dmitry Kozlov (xeb@mail.ru)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 *
11 */
12
13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14
15 #include <linux/capability.h>
16 #include <linux/module.h>
17 #include <linux/types.h>
18 #include <linux/kernel.h>
19 #include <linux/slab.h>
20 #include <linux/uaccess.h>
21 #include <linux/skbuff.h>
22 #include <linux/netdevice.h>
23 #include <linux/in.h>
24 #include <linux/tcp.h>
25 #include <linux/udp.h>
26 #include <linux/if_arp.h>
27 #include <linux/init.h>
28 #include <linux/in6.h>
29 #include <linux/inetdevice.h>
30 #include <linux/igmp.h>
31 #include <linux/netfilter_ipv4.h>
32 #include <linux/etherdevice.h>
33 #include <linux/if_ether.h>
34 #include <linux/hash.h>
35 #include <linux/if_tunnel.h>
36 #include <linux/ip6_tunnel.h>
37
38 #include <net/sock.h>
39 #include <net/ip.h>
40 #include <net/ip_tunnels.h>
41 #include <net/icmp.h>
42 #include <net/protocol.h>
43 #include <net/addrconf.h>
44 #include <net/arp.h>
45 #include <net/checksum.h>
46 #include <net/dsfield.h>
47 #include <net/inet_ecn.h>
48 #include <net/xfrm.h>
49 #include <net/net_namespace.h>
50 #include <net/netns/generic.h>
51 #include <net/rtnetlink.h>
52
53 #include <net/ipv6.h>
54 #include <net/ip6_fib.h>
55 #include <net/ip6_route.h>
56 #include <net/ip6_tunnel.h>
57 #include <net/gre.h>
58
59
60 static bool log_ecn_error = true;
61 module_param(log_ecn_error, bool, 0644);
62 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
63
64 #define IP6_GRE_HASH_SIZE_SHIFT 5
65 #define IP6_GRE_HASH_SIZE (1 << IP6_GRE_HASH_SIZE_SHIFT)
66
67 static unsigned int ip6gre_net_id __read_mostly;
68 struct ip6gre_net {
69 struct ip6_tnl __rcu *tunnels[4][IP6_GRE_HASH_SIZE];
70
71 struct net_device *fb_tunnel_dev;
72 };
73
74 static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
75 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly;
76 static int ip6gre_tunnel_init(struct net_device *dev);
77 static void ip6gre_tunnel_setup(struct net_device *dev);
78 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
79 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
80
81 /* Tunnel hash table */
82
83 /*
84 4 hash tables:
85
86 3: (remote,local)
87 2: (remote,*)
88 1: (*,local)
89 0: (*,*)
90
91 We require exact key match i.e. if a key is present in packet
92 it will match only tunnel with the same key; if it is not present,
93 it will match only keyless tunnel.
94
95 All keysless packets, if not matched configured keyless tunnels
96 will match fallback tunnel.
97 */
98
99 #define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(IP6_GRE_HASH_SIZE - 1))
100 static u32 HASH_ADDR(const struct in6_addr *addr)
101 {
102 u32 hash = ipv6_addr_hash(addr);
103
104 return hash_32(hash, IP6_GRE_HASH_SIZE_SHIFT);
105 }
106
107 #define tunnels_r_l tunnels[3]
108 #define tunnels_r tunnels[2]
109 #define tunnels_l tunnels[1]
110 #define tunnels_wc tunnels[0]
111
112 /* Given src, dst and key, find appropriate for input tunnel. */
113
114 static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev,
115 const struct in6_addr *remote, const struct in6_addr *local,
116 __be32 key, __be16 gre_proto)
117 {
118 struct net *net = dev_net(dev);
119 int link = dev->ifindex;
120 unsigned int h0 = HASH_ADDR(remote);
121 unsigned int h1 = HASH_KEY(key);
122 struct ip6_tnl *t, *cand = NULL;
123 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
124 int dev_type = (gre_proto == htons(ETH_P_TEB)) ?
125 ARPHRD_ETHER : ARPHRD_IP6GRE;
126 int score, cand_score = 4;
127
128 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
129 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
130 !ipv6_addr_equal(remote, &t->parms.raddr) ||
131 key != t->parms.i_key ||
132 !(t->dev->flags & IFF_UP))
133 continue;
134
135 if (t->dev->type != ARPHRD_IP6GRE &&
136 t->dev->type != dev_type)
137 continue;
138
139 score = 0;
140 if (t->parms.link != link)
141 score |= 1;
142 if (t->dev->type != dev_type)
143 score |= 2;
144 if (score == 0)
145 return t;
146
147 if (score < cand_score) {
148 cand = t;
149 cand_score = score;
150 }
151 }
152
153 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
154 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
155 key != t->parms.i_key ||
156 !(t->dev->flags & IFF_UP))
157 continue;
158
159 if (t->dev->type != ARPHRD_IP6GRE &&
160 t->dev->type != dev_type)
161 continue;
162
163 score = 0;
164 if (t->parms.link != link)
165 score |= 1;
166 if (t->dev->type != dev_type)
167 score |= 2;
168 if (score == 0)
169 return t;
170
171 if (score < cand_score) {
172 cand = t;
173 cand_score = score;
174 }
175 }
176
177 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
178 if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
179 (!ipv6_addr_equal(local, &t->parms.raddr) ||
180 !ipv6_addr_is_multicast(local))) ||
181 key != t->parms.i_key ||
182 !(t->dev->flags & IFF_UP))
183 continue;
184
185 if (t->dev->type != ARPHRD_IP6GRE &&
186 t->dev->type != dev_type)
187 continue;
188
189 score = 0;
190 if (t->parms.link != link)
191 score |= 1;
192 if (t->dev->type != dev_type)
193 score |= 2;
194 if (score == 0)
195 return t;
196
197 if (score < cand_score) {
198 cand = t;
199 cand_score = score;
200 }
201 }
202
203 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
204 if (t->parms.i_key != key ||
205 !(t->dev->flags & IFF_UP))
206 continue;
207
208 if (t->dev->type != ARPHRD_IP6GRE &&
209 t->dev->type != dev_type)
210 continue;
211
212 score = 0;
213 if (t->parms.link != link)
214 score |= 1;
215 if (t->dev->type != dev_type)
216 score |= 2;
217 if (score == 0)
218 return t;
219
220 if (score < cand_score) {
221 cand = t;
222 cand_score = score;
223 }
224 }
225
226 if (cand)
227 return cand;
228
229 dev = ign->fb_tunnel_dev;
230 if (dev->flags & IFF_UP)
231 return netdev_priv(dev);
232
233 return NULL;
234 }
235
236 static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
237 const struct __ip6_tnl_parm *p)
238 {
239 const struct in6_addr *remote = &p->raddr;
240 const struct in6_addr *local = &p->laddr;
241 unsigned int h = HASH_KEY(p->i_key);
242 int prio = 0;
243
244 if (!ipv6_addr_any(local))
245 prio |= 1;
246 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
247 prio |= 2;
248 h ^= HASH_ADDR(remote);
249 }
250
251 return &ign->tunnels[prio][h];
252 }
253
254 static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
255 const struct ip6_tnl *t)
256 {
257 return __ip6gre_bucket(ign, &t->parms);
258 }
259
260 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
261 {
262 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
263
264 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
265 rcu_assign_pointer(*tp, t);
266 }
267
268 static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
269 {
270 struct ip6_tnl __rcu **tp;
271 struct ip6_tnl *iter;
272
273 for (tp = ip6gre_bucket(ign, t);
274 (iter = rtnl_dereference(*tp)) != NULL;
275 tp = &iter->next) {
276 if (t == iter) {
277 rcu_assign_pointer(*tp, t->next);
278 break;
279 }
280 }
281 }
282
283 static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
284 const struct __ip6_tnl_parm *parms,
285 int type)
286 {
287 const struct in6_addr *remote = &parms->raddr;
288 const struct in6_addr *local = &parms->laddr;
289 __be32 key = parms->i_key;
290 int link = parms->link;
291 struct ip6_tnl *t;
292 struct ip6_tnl __rcu **tp;
293 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
294
295 for (tp = __ip6gre_bucket(ign, parms);
296 (t = rtnl_dereference(*tp)) != NULL;
297 tp = &t->next)
298 if (ipv6_addr_equal(local, &t->parms.laddr) &&
299 ipv6_addr_equal(remote, &t->parms.raddr) &&
300 key == t->parms.i_key &&
301 link == t->parms.link &&
302 type == t->dev->type)
303 break;
304
305 return t;
306 }
307
308 static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
309 const struct __ip6_tnl_parm *parms, int create)
310 {
311 struct ip6_tnl *t, *nt;
312 struct net_device *dev;
313 char name[IFNAMSIZ];
314 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
315
316 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
317 if (t && create)
318 return NULL;
319 if (t || !create)
320 return t;
321
322 if (parms->name[0])
323 strlcpy(name, parms->name, IFNAMSIZ);
324 else
325 strcpy(name, "ip6gre%d");
326
327 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
328 ip6gre_tunnel_setup);
329 if (!dev)
330 return NULL;
331
332 dev_net_set(dev, net);
333
334 nt = netdev_priv(dev);
335 nt->parms = *parms;
336 dev->rtnl_link_ops = &ip6gre_link_ops;
337
338 nt->dev = dev;
339 nt->net = dev_net(dev);
340 ip6gre_tnl_link_config(nt, 1);
341
342 if (register_netdevice(dev) < 0)
343 goto failed_free;
344
345 /* Can use a lockless transmit, unless we generate output sequences */
346 if (!(nt->parms.o_flags & TUNNEL_SEQ))
347 dev->features |= NETIF_F_LLTX;
348
349 dev_hold(dev);
350 ip6gre_tunnel_link(ign, nt);
351 return nt;
352
353 failed_free:
354 free_netdev(dev);
355 return NULL;
356 }
357
358 static void ip6gre_tunnel_uninit(struct net_device *dev)
359 {
360 struct ip6_tnl *t = netdev_priv(dev);
361 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
362
363 ip6gre_tunnel_unlink(ign, t);
364 dst_cache_reset(&t->dst_cache);
365 dev_put(dev);
366 }
367
368
369 static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
370 u8 type, u8 code, int offset, __be32 info)
371 {
372 const struct gre_base_hdr *greh;
373 const struct ipv6hdr *ipv6h;
374 int grehlen = sizeof(*greh);
375 struct ip6_tnl *t;
376 int key_off = 0;
377 __be16 flags;
378 __be32 key;
379
380 if (!pskb_may_pull(skb, offset + grehlen))
381 return;
382 greh = (const struct gre_base_hdr *)(skb->data + offset);
383 flags = greh->flags;
384 if (flags & (GRE_VERSION | GRE_ROUTING))
385 return;
386 if (flags & GRE_CSUM)
387 grehlen += 4;
388 if (flags & GRE_KEY) {
389 key_off = grehlen + offset;
390 grehlen += 4;
391 }
392
393 if (!pskb_may_pull(skb, offset + grehlen))
394 return;
395 ipv6h = (const struct ipv6hdr *)skb->data;
396 greh = (const struct gre_base_hdr *)(skb->data + offset);
397 key = key_off ? *(__be32 *)(skb->data + key_off) : 0;
398
399 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
400 key, greh->protocol);
401 if (!t)
402 return;
403
404 switch (type) {
405 __u32 teli;
406 struct ipv6_tlv_tnl_enc_lim *tel;
407 __u32 mtu;
408 case ICMPV6_DEST_UNREACH:
409 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
410 t->parms.name);
411 if (code != ICMPV6_PORT_UNREACH)
412 break;
413 return;
414 case ICMPV6_TIME_EXCEED:
415 if (code == ICMPV6_EXC_HOPLIMIT) {
416 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
417 t->parms.name);
418 break;
419 }
420 return;
421 case ICMPV6_PARAMPROB:
422 teli = 0;
423 if (code == ICMPV6_HDR_FIELD)
424 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
425
426 if (teli && teli == be32_to_cpu(info) - 2) {
427 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
428 if (tel->encap_limit == 0) {
429 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
430 t->parms.name);
431 }
432 } else {
433 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
434 t->parms.name);
435 }
436 return;
437 case ICMPV6_PKT_TOOBIG:
438 mtu = be32_to_cpu(info) - offset - t->tun_hlen;
439 if (t->dev->type == ARPHRD_ETHER)
440 mtu -= ETH_HLEN;
441 if (mtu < IPV6_MIN_MTU)
442 mtu = IPV6_MIN_MTU;
443 t->dev->mtu = mtu;
444 return;
445 }
446
447 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
448 t->err_count++;
449 else
450 t->err_count = 1;
451 t->err_time = jiffies;
452 }
453
454 static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
455 {
456 const struct ipv6hdr *ipv6h;
457 struct ip6_tnl *tunnel;
458
459 ipv6h = ipv6_hdr(skb);
460 tunnel = ip6gre_tunnel_lookup(skb->dev,
461 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
462 tpi->proto);
463 if (tunnel) {
464 ip6_tnl_rcv(tunnel, skb, tpi, NULL, false);
465
466 return PACKET_RCVD;
467 }
468
469 return PACKET_REJECT;
470 }
471
472 static int gre_rcv(struct sk_buff *skb)
473 {
474 struct tnl_ptk_info tpi;
475 bool csum_err = false;
476 int hdr_len;
477
478 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
479 if (hdr_len < 0)
480 goto drop;
481
482 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
483 goto drop;
484
485 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
486 return 0;
487
488 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
489 drop:
490 kfree_skb(skb);
491 return 0;
492 }
493
494 static int gre_handle_offloads(struct sk_buff *skb, bool csum)
495 {
496 return iptunnel_handle_offloads(skb,
497 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
498 }
499
500 static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
501 struct net_device *dev, __u8 dsfield,
502 struct flowi6 *fl6, int encap_limit,
503 __u32 *pmtu, __be16 proto)
504 {
505 struct ip6_tnl *tunnel = netdev_priv(dev);
506 struct dst_entry *dst = skb_dst(skb);
507 __be16 protocol;
508
509 if (dev->type == ARPHRD_ETHER)
510 IPCB(skb)->flags = 0;
511
512 if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
513 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
514 else
515 fl6->daddr = tunnel->parms.raddr;
516
517 if (tunnel->parms.o_flags & TUNNEL_SEQ)
518 tunnel->o_seqno++;
519
520 /* Push GRE header. */
521 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
522 gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags,
523 protocol, tunnel->parms.o_key, htonl(tunnel->o_seqno));
524
525 /* TooBig packet may have updated dst->dev's mtu */
526 if (dst && dst_mtu(dst) > dst->dev->mtu)
527 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu);
528
529 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
530 NEXTHDR_GRE);
531 }
532
533 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
534 {
535 struct ip6_tnl *t = netdev_priv(dev);
536 const struct iphdr *iph = ip_hdr(skb);
537 int encap_limit = -1;
538 struct flowi6 fl6;
539 __u8 dsfield;
540 __u32 mtu;
541 int err;
542
543 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
544
545 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
546 encap_limit = t->parms.encap_limit;
547
548 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
549
550 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
551 dsfield = ipv4_get_dsfield(iph);
552 else
553 dsfield = ip6_tclass(t->parms.flowinfo);
554 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
555 fl6.flowi6_mark = skb->mark;
556 else
557 fl6.flowi6_mark = t->parms.fwmark;
558
559 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
560
561 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
562 if (err)
563 return -1;
564
565 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
566 skb->protocol);
567 if (err != 0) {
568 /* XXX: send ICMP error even if DF is not set. */
569 if (err == -EMSGSIZE)
570 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
571 htonl(mtu));
572 return -1;
573 }
574
575 return 0;
576 }
577
578 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
579 {
580 struct ip6_tnl *t = netdev_priv(dev);
581 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
582 int encap_limit = -1;
583 __u16 offset;
584 struct flowi6 fl6;
585 __u8 dsfield;
586 __u32 mtu;
587 int err;
588
589 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
590 return -1;
591
592 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
593 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
594 ipv6h = ipv6_hdr(skb);
595
596 if (offset > 0) {
597 struct ipv6_tlv_tnl_enc_lim *tel;
598 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
599 if (tel->encap_limit == 0) {
600 icmpv6_send(skb, ICMPV6_PARAMPROB,
601 ICMPV6_HDR_FIELD, offset + 2);
602 return -1;
603 }
604 encap_limit = tel->encap_limit - 1;
605 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
606 encap_limit = t->parms.encap_limit;
607
608 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
609
610 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
611 dsfield = ipv6_get_dsfield(ipv6h);
612 else
613 dsfield = ip6_tclass(t->parms.flowinfo);
614
615 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
616 fl6.flowlabel |= ip6_flowlabel(ipv6h);
617 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
618 fl6.flowi6_mark = skb->mark;
619 else
620 fl6.flowi6_mark = t->parms.fwmark;
621
622 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
623
624 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
625 return -1;
626
627 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
628 &mtu, skb->protocol);
629 if (err != 0) {
630 if (err == -EMSGSIZE)
631 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
632 return -1;
633 }
634
635 return 0;
636 }
637
638 /**
639 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
640 * @t: the outgoing tunnel device
641 * @hdr: IPv6 header from the incoming packet
642 *
643 * Description:
644 * Avoid trivial tunneling loop by checking that tunnel exit-point
645 * doesn't match source of incoming packet.
646 *
647 * Return:
648 * 1 if conflict,
649 * 0 else
650 **/
651
652 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
653 const struct ipv6hdr *hdr)
654 {
655 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
656 }
657
658 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
659 {
660 struct ip6_tnl *t = netdev_priv(dev);
661 int encap_limit = -1;
662 struct flowi6 fl6;
663 __u32 mtu;
664 int err;
665
666 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
667 encap_limit = t->parms.encap_limit;
668
669 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
670
671 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
672 if (err)
673 return err;
674
675 err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol);
676
677 return err;
678 }
679
680 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
681 struct net_device *dev)
682 {
683 struct ip6_tnl *t = netdev_priv(dev);
684 struct net_device_stats *stats = &t->dev->stats;
685 int ret;
686
687 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
688 goto tx_err;
689
690 switch (skb->protocol) {
691 case htons(ETH_P_IP):
692 ret = ip6gre_xmit_ipv4(skb, dev);
693 break;
694 case htons(ETH_P_IPV6):
695 ret = ip6gre_xmit_ipv6(skb, dev);
696 break;
697 default:
698 ret = ip6gre_xmit_other(skb, dev);
699 break;
700 }
701
702 if (ret < 0)
703 goto tx_err;
704
705 return NETDEV_TX_OK;
706
707 tx_err:
708 stats->tx_errors++;
709 stats->tx_dropped++;
710 kfree_skb(skb);
711 return NETDEV_TX_OK;
712 }
713
714 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
715 {
716 struct net_device *dev = t->dev;
717 struct __ip6_tnl_parm *p = &t->parms;
718 struct flowi6 *fl6 = &t->fl.u.ip6;
719 int t_hlen;
720
721 if (dev->type != ARPHRD_ETHER) {
722 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
723 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
724 }
725
726 /* Set up flowi template */
727 fl6->saddr = p->laddr;
728 fl6->daddr = p->raddr;
729 fl6->flowi6_oif = p->link;
730 fl6->flowlabel = 0;
731 fl6->flowi6_proto = IPPROTO_GRE;
732
733 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
734 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
735 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
736 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
737
738 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
739 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
740
741 if (p->flags&IP6_TNL_F_CAP_XMIT &&
742 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
743 dev->flags |= IFF_POINTOPOINT;
744 else
745 dev->flags &= ~IFF_POINTOPOINT;
746
747 t->tun_hlen = gre_calc_hlen(t->parms.o_flags);
748
749 t->hlen = t->encap_hlen + t->tun_hlen;
750
751 t_hlen = t->hlen + sizeof(struct ipv6hdr);
752
753 if (p->flags & IP6_TNL_F_CAP_XMIT) {
754 int strict = (ipv6_addr_type(&p->raddr) &
755 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
756
757 struct rt6_info *rt = rt6_lookup(t->net,
758 &p->raddr, &p->laddr,
759 p->link, strict);
760
761 if (!rt)
762 return;
763
764 if (rt->dst.dev) {
765 dev->hard_header_len = rt->dst.dev->hard_header_len +
766 t_hlen;
767
768 if (set_mtu) {
769 dev->mtu = rt->dst.dev->mtu - t_hlen;
770 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
771 dev->mtu -= 8;
772 if (dev->type == ARPHRD_ETHER)
773 dev->mtu -= ETH_HLEN;
774
775 if (dev->mtu < IPV6_MIN_MTU)
776 dev->mtu = IPV6_MIN_MTU;
777 }
778 }
779 ip6_rt_put(rt);
780 }
781 }
782
783 static int ip6gre_tnl_change(struct ip6_tnl *t,
784 const struct __ip6_tnl_parm *p, int set_mtu)
785 {
786 t->parms.laddr = p->laddr;
787 t->parms.raddr = p->raddr;
788 t->parms.flags = p->flags;
789 t->parms.hop_limit = p->hop_limit;
790 t->parms.encap_limit = p->encap_limit;
791 t->parms.flowinfo = p->flowinfo;
792 t->parms.link = p->link;
793 t->parms.proto = p->proto;
794 t->parms.i_key = p->i_key;
795 t->parms.o_key = p->o_key;
796 t->parms.i_flags = p->i_flags;
797 t->parms.o_flags = p->o_flags;
798 t->parms.fwmark = p->fwmark;
799 dst_cache_reset(&t->dst_cache);
800 ip6gre_tnl_link_config(t, set_mtu);
801 return 0;
802 }
803
804 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
805 const struct ip6_tnl_parm2 *u)
806 {
807 p->laddr = u->laddr;
808 p->raddr = u->raddr;
809 p->flags = u->flags;
810 p->hop_limit = u->hop_limit;
811 p->encap_limit = u->encap_limit;
812 p->flowinfo = u->flowinfo;
813 p->link = u->link;
814 p->i_key = u->i_key;
815 p->o_key = u->o_key;
816 p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
817 p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
818 memcpy(p->name, u->name, sizeof(u->name));
819 }
820
821 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
822 const struct __ip6_tnl_parm *p)
823 {
824 u->proto = IPPROTO_GRE;
825 u->laddr = p->laddr;
826 u->raddr = p->raddr;
827 u->flags = p->flags;
828 u->hop_limit = p->hop_limit;
829 u->encap_limit = p->encap_limit;
830 u->flowinfo = p->flowinfo;
831 u->link = p->link;
832 u->i_key = p->i_key;
833 u->o_key = p->o_key;
834 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
835 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
836 memcpy(u->name, p->name, sizeof(u->name));
837 }
838
839 static int ip6gre_tunnel_ioctl(struct net_device *dev,
840 struct ifreq *ifr, int cmd)
841 {
842 int err = 0;
843 struct ip6_tnl_parm2 p;
844 struct __ip6_tnl_parm p1;
845 struct ip6_tnl *t = netdev_priv(dev);
846 struct net *net = t->net;
847 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
848
849 memset(&p1, 0, sizeof(p1));
850
851 switch (cmd) {
852 case SIOCGETTUNNEL:
853 if (dev == ign->fb_tunnel_dev) {
854 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
855 err = -EFAULT;
856 break;
857 }
858 ip6gre_tnl_parm_from_user(&p1, &p);
859 t = ip6gre_tunnel_locate(net, &p1, 0);
860 if (!t)
861 t = netdev_priv(dev);
862 }
863 memset(&p, 0, sizeof(p));
864 ip6gre_tnl_parm_to_user(&p, &t->parms);
865 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
866 err = -EFAULT;
867 break;
868
869 case SIOCADDTUNNEL:
870 case SIOCCHGTUNNEL:
871 err = -EPERM;
872 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
873 goto done;
874
875 err = -EFAULT;
876 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
877 goto done;
878
879 err = -EINVAL;
880 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
881 goto done;
882
883 if (!(p.i_flags&GRE_KEY))
884 p.i_key = 0;
885 if (!(p.o_flags&GRE_KEY))
886 p.o_key = 0;
887
888 ip6gre_tnl_parm_from_user(&p1, &p);
889 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
890
891 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
892 if (t) {
893 if (t->dev != dev) {
894 err = -EEXIST;
895 break;
896 }
897 } else {
898 t = netdev_priv(dev);
899
900 ip6gre_tunnel_unlink(ign, t);
901 synchronize_net();
902 ip6gre_tnl_change(t, &p1, 1);
903 ip6gre_tunnel_link(ign, t);
904 netdev_state_change(dev);
905 }
906 }
907
908 if (t) {
909 err = 0;
910
911 memset(&p, 0, sizeof(p));
912 ip6gre_tnl_parm_to_user(&p, &t->parms);
913 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
914 err = -EFAULT;
915 } else
916 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
917 break;
918
919 case SIOCDELTUNNEL:
920 err = -EPERM;
921 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
922 goto done;
923
924 if (dev == ign->fb_tunnel_dev) {
925 err = -EFAULT;
926 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
927 goto done;
928 err = -ENOENT;
929 ip6gre_tnl_parm_from_user(&p1, &p);
930 t = ip6gre_tunnel_locate(net, &p1, 0);
931 if (!t)
932 goto done;
933 err = -EPERM;
934 if (t == netdev_priv(ign->fb_tunnel_dev))
935 goto done;
936 dev = t->dev;
937 }
938 unregister_netdevice(dev);
939 err = 0;
940 break;
941
942 default:
943 err = -EINVAL;
944 }
945
946 done:
947 return err;
948 }
949
950 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
951 unsigned short type, const void *daddr,
952 const void *saddr, unsigned int len)
953 {
954 struct ip6_tnl *t = netdev_priv(dev);
955 struct ipv6hdr *ipv6h;
956 __be16 *p;
957
958 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
959 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
960 t->fl.u.ip6.flowlabel,
961 true, &t->fl.u.ip6));
962 ipv6h->hop_limit = t->parms.hop_limit;
963 ipv6h->nexthdr = NEXTHDR_GRE;
964 ipv6h->saddr = t->parms.laddr;
965 ipv6h->daddr = t->parms.raddr;
966
967 p = (__be16 *)(ipv6h + 1);
968 p[0] = t->parms.o_flags;
969 p[1] = htons(type);
970
971 /*
972 * Set the source hardware address.
973 */
974
975 if (saddr)
976 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
977 if (daddr)
978 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
979 if (!ipv6_addr_any(&ipv6h->daddr))
980 return t->hlen;
981
982 return -t->hlen;
983 }
984
985 static const struct header_ops ip6gre_header_ops = {
986 .create = ip6gre_header,
987 };
988
989 static const struct net_device_ops ip6gre_netdev_ops = {
990 .ndo_init = ip6gre_tunnel_init,
991 .ndo_uninit = ip6gre_tunnel_uninit,
992 .ndo_start_xmit = ip6gre_tunnel_xmit,
993 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
994 .ndo_change_mtu = ip6_tnl_change_mtu,
995 .ndo_get_stats64 = ip_tunnel_get_stats64,
996 .ndo_get_iflink = ip6_tnl_get_iflink,
997 };
998
999 static void ip6gre_dev_free(struct net_device *dev)
1000 {
1001 struct ip6_tnl *t = netdev_priv(dev);
1002
1003 dst_cache_destroy(&t->dst_cache);
1004 free_percpu(dev->tstats);
1005 }
1006
1007 static void ip6gre_tunnel_setup(struct net_device *dev)
1008 {
1009 dev->netdev_ops = &ip6gre_netdev_ops;
1010 dev->needs_free_netdev = true;
1011 dev->priv_destructor = ip6gre_dev_free;
1012
1013 dev->type = ARPHRD_IP6GRE;
1014
1015 dev->flags |= IFF_NOARP;
1016 dev->addr_len = sizeof(struct in6_addr);
1017 netif_keep_dst(dev);
1018 /* This perm addr will be used as interface identifier by IPv6 */
1019 dev->addr_assign_type = NET_ADDR_RANDOM;
1020 eth_random_addr(dev->perm_addr);
1021 }
1022
1023 static int ip6gre_tunnel_init_common(struct net_device *dev)
1024 {
1025 struct ip6_tnl *tunnel;
1026 int ret;
1027 int t_hlen;
1028
1029 tunnel = netdev_priv(dev);
1030
1031 tunnel->dev = dev;
1032 tunnel->net = dev_net(dev);
1033 strcpy(tunnel->parms.name, dev->name);
1034
1035 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1036 if (!dev->tstats)
1037 return -ENOMEM;
1038
1039 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1040 if (ret) {
1041 free_percpu(dev->tstats);
1042 dev->tstats = NULL;
1043 return ret;
1044 }
1045
1046 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1047 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1048 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1049
1050 dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1051 dev->mtu = ETH_DATA_LEN - t_hlen;
1052 if (dev->type == ARPHRD_ETHER)
1053 dev->mtu -= ETH_HLEN;
1054 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1055 dev->mtu -= 8;
1056
1057 return 0;
1058 }
1059
1060 static int ip6gre_tunnel_init(struct net_device *dev)
1061 {
1062 struct ip6_tnl *tunnel;
1063 int ret;
1064
1065 ret = ip6gre_tunnel_init_common(dev);
1066 if (ret)
1067 return ret;
1068
1069 tunnel = netdev_priv(dev);
1070
1071 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1072 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1073
1074 if (ipv6_addr_any(&tunnel->parms.raddr))
1075 dev->header_ops = &ip6gre_header_ops;
1076
1077 return 0;
1078 }
1079
1080 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1081 {
1082 struct ip6_tnl *tunnel = netdev_priv(dev);
1083
1084 tunnel->dev = dev;
1085 tunnel->net = dev_net(dev);
1086 strcpy(tunnel->parms.name, dev->name);
1087
1088 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1089
1090 dev_hold(dev);
1091 }
1092
1093
1094 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1095 .handler = gre_rcv,
1096 .err_handler = ip6gre_err,
1097 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1098 };
1099
1100 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1101 {
1102 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1103 struct net_device *dev, *aux;
1104 int prio;
1105
1106 for_each_netdev_safe(net, dev, aux)
1107 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1108 dev->rtnl_link_ops == &ip6gre_tap_ops)
1109 unregister_netdevice_queue(dev, head);
1110
1111 for (prio = 0; prio < 4; prio++) {
1112 int h;
1113 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1114 struct ip6_tnl *t;
1115
1116 t = rtnl_dereference(ign->tunnels[prio][h]);
1117
1118 while (t) {
1119 /* If dev is in the same netns, it has already
1120 * been added to the list by the previous loop.
1121 */
1122 if (!net_eq(dev_net(t->dev), net))
1123 unregister_netdevice_queue(t->dev,
1124 head);
1125 t = rtnl_dereference(t->next);
1126 }
1127 }
1128 }
1129 }
1130
1131 static int __net_init ip6gre_init_net(struct net *net)
1132 {
1133 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1134 int err;
1135
1136 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1137 NET_NAME_UNKNOWN,
1138 ip6gre_tunnel_setup);
1139 if (!ign->fb_tunnel_dev) {
1140 err = -ENOMEM;
1141 goto err_alloc_dev;
1142 }
1143 dev_net_set(ign->fb_tunnel_dev, net);
1144 /* FB netdevice is special: we have one, and only one per netns.
1145 * Allowing to move it to another netns is clearly unsafe.
1146 */
1147 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1148
1149
1150 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1151 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1152
1153 err = register_netdev(ign->fb_tunnel_dev);
1154 if (err)
1155 goto err_reg_dev;
1156
1157 rcu_assign_pointer(ign->tunnels_wc[0],
1158 netdev_priv(ign->fb_tunnel_dev));
1159 return 0;
1160
1161 err_reg_dev:
1162 free_netdev(ign->fb_tunnel_dev);
1163 err_alloc_dev:
1164 return err;
1165 }
1166
1167 static void __net_exit ip6gre_exit_net(struct net *net)
1168 {
1169 LIST_HEAD(list);
1170
1171 rtnl_lock();
1172 ip6gre_destroy_tunnels(net, &list);
1173 unregister_netdevice_many(&list);
1174 rtnl_unlock();
1175 }
1176
1177 static struct pernet_operations ip6gre_net_ops = {
1178 .init = ip6gre_init_net,
1179 .exit = ip6gre_exit_net,
1180 .id = &ip6gre_net_id,
1181 .size = sizeof(struct ip6gre_net),
1182 };
1183
1184 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1185 struct netlink_ext_ack *extack)
1186 {
1187 __be16 flags;
1188
1189 if (!data)
1190 return 0;
1191
1192 flags = 0;
1193 if (data[IFLA_GRE_IFLAGS])
1194 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1195 if (data[IFLA_GRE_OFLAGS])
1196 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1197 if (flags & (GRE_VERSION|GRE_ROUTING))
1198 return -EINVAL;
1199
1200 return 0;
1201 }
1202
1203 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1204 struct netlink_ext_ack *extack)
1205 {
1206 struct in6_addr daddr;
1207
1208 if (tb[IFLA_ADDRESS]) {
1209 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1210 return -EINVAL;
1211 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1212 return -EADDRNOTAVAIL;
1213 }
1214
1215 if (!data)
1216 goto out;
1217
1218 if (data[IFLA_GRE_REMOTE]) {
1219 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1220 if (ipv6_addr_any(&daddr))
1221 return -EINVAL;
1222 }
1223
1224 out:
1225 return ip6gre_tunnel_validate(tb, data, extack);
1226 }
1227
1228
1229 static void ip6gre_netlink_parms(struct nlattr *data[],
1230 struct __ip6_tnl_parm *parms)
1231 {
1232 memset(parms, 0, sizeof(*parms));
1233
1234 if (!data)
1235 return;
1236
1237 if (data[IFLA_GRE_LINK])
1238 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1239
1240 if (data[IFLA_GRE_IFLAGS])
1241 parms->i_flags = gre_flags_to_tnl_flags(
1242 nla_get_be16(data[IFLA_GRE_IFLAGS]));
1243
1244 if (data[IFLA_GRE_OFLAGS])
1245 parms->o_flags = gre_flags_to_tnl_flags(
1246 nla_get_be16(data[IFLA_GRE_OFLAGS]));
1247
1248 if (data[IFLA_GRE_IKEY])
1249 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1250
1251 if (data[IFLA_GRE_OKEY])
1252 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1253
1254 if (data[IFLA_GRE_LOCAL])
1255 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1256
1257 if (data[IFLA_GRE_REMOTE])
1258 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1259
1260 if (data[IFLA_GRE_TTL])
1261 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1262
1263 if (data[IFLA_GRE_ENCAP_LIMIT])
1264 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1265
1266 if (data[IFLA_GRE_FLOWINFO])
1267 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1268
1269 if (data[IFLA_GRE_FLAGS])
1270 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1271
1272 if (data[IFLA_GRE_FWMARK])
1273 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1274 }
1275
1276 static int ip6gre_tap_init(struct net_device *dev)
1277 {
1278 struct ip6_tnl *tunnel;
1279 int ret;
1280
1281 ret = ip6gre_tunnel_init_common(dev);
1282 if (ret)
1283 return ret;
1284
1285 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1286
1287 tunnel = netdev_priv(dev);
1288
1289 ip6gre_tnl_link_config(tunnel, 1);
1290
1291 return 0;
1292 }
1293
1294 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1295 .ndo_init = ip6gre_tap_init,
1296 .ndo_uninit = ip6gre_tunnel_uninit,
1297 .ndo_start_xmit = ip6gre_tunnel_xmit,
1298 .ndo_set_mac_address = eth_mac_addr,
1299 .ndo_validate_addr = eth_validate_addr,
1300 .ndo_change_mtu = ip6_tnl_change_mtu,
1301 .ndo_get_stats64 = ip_tunnel_get_stats64,
1302 .ndo_get_iflink = ip6_tnl_get_iflink,
1303 };
1304
1305 #define GRE6_FEATURES (NETIF_F_SG | \
1306 NETIF_F_FRAGLIST | \
1307 NETIF_F_HIGHDMA | \
1308 NETIF_F_HW_CSUM)
1309
1310 static void ip6gre_tap_setup(struct net_device *dev)
1311 {
1312
1313 ether_setup(dev);
1314
1315 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1316 dev->needs_free_netdev = true;
1317 dev->priv_destructor = ip6gre_dev_free;
1318
1319 dev->features |= NETIF_F_NETNS_LOCAL;
1320 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1321 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1322 netif_keep_dst(dev);
1323 }
1324
1325 static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1326 struct ip_tunnel_encap *ipencap)
1327 {
1328 bool ret = false;
1329
1330 memset(ipencap, 0, sizeof(*ipencap));
1331
1332 if (!data)
1333 return ret;
1334
1335 if (data[IFLA_GRE_ENCAP_TYPE]) {
1336 ret = true;
1337 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1338 }
1339
1340 if (data[IFLA_GRE_ENCAP_FLAGS]) {
1341 ret = true;
1342 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1343 }
1344
1345 if (data[IFLA_GRE_ENCAP_SPORT]) {
1346 ret = true;
1347 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1348 }
1349
1350 if (data[IFLA_GRE_ENCAP_DPORT]) {
1351 ret = true;
1352 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1353 }
1354
1355 return ret;
1356 }
1357
1358 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1359 struct nlattr *tb[], struct nlattr *data[],
1360 struct netlink_ext_ack *extack)
1361 {
1362 struct ip6_tnl *nt;
1363 struct net *net = dev_net(dev);
1364 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1365 struct ip_tunnel_encap ipencap;
1366 int err;
1367
1368 nt = netdev_priv(dev);
1369
1370 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1371 int err = ip6_tnl_encap_setup(nt, &ipencap);
1372
1373 if (err < 0)
1374 return err;
1375 }
1376
1377 ip6gre_netlink_parms(data, &nt->parms);
1378
1379 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1380 return -EEXIST;
1381
1382 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1383 eth_hw_addr_random(dev);
1384
1385 nt->dev = dev;
1386 nt->net = dev_net(dev);
1387 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1388
1389 dev->features |= GRE6_FEATURES;
1390 dev->hw_features |= GRE6_FEATURES;
1391
1392 if (!(nt->parms.o_flags & TUNNEL_SEQ)) {
1393 /* TCP offload with GRE SEQ is not supported, nor
1394 * can we support 2 levels of outer headers requiring
1395 * an update.
1396 */
1397 if (!(nt->parms.o_flags & TUNNEL_CSUM) ||
1398 (nt->encap.type == TUNNEL_ENCAP_NONE)) {
1399 dev->features |= NETIF_F_GSO_SOFTWARE;
1400 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1401 }
1402
1403 /* Can use a lockless transmit, unless we generate
1404 * output sequences
1405 */
1406 dev->features |= NETIF_F_LLTX;
1407 }
1408
1409 err = register_netdevice(dev);
1410 if (err)
1411 goto out;
1412
1413 dev_hold(dev);
1414 ip6gre_tunnel_link(ign, nt);
1415
1416 out:
1417 return err;
1418 }
1419
1420 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
1421 struct nlattr *data[],
1422 struct netlink_ext_ack *extack)
1423 {
1424 struct ip6_tnl *t, *nt = netdev_priv(dev);
1425 struct net *net = nt->net;
1426 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1427 struct __ip6_tnl_parm p;
1428 struct ip_tunnel_encap ipencap;
1429
1430 if (dev == ign->fb_tunnel_dev)
1431 return -EINVAL;
1432
1433 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1434 int err = ip6_tnl_encap_setup(nt, &ipencap);
1435
1436 if (err < 0)
1437 return err;
1438 }
1439
1440 ip6gre_netlink_parms(data, &p);
1441
1442 t = ip6gre_tunnel_locate(net, &p, 0);
1443
1444 if (t) {
1445 if (t->dev != dev)
1446 return -EEXIST;
1447 } else {
1448 t = nt;
1449 }
1450
1451 ip6gre_tunnel_unlink(ign, t);
1452 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
1453 ip6gre_tunnel_link(ign, t);
1454 return 0;
1455 }
1456
1457 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
1458 {
1459 struct net *net = dev_net(dev);
1460 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1461
1462 if (dev != ign->fb_tunnel_dev)
1463 unregister_netdevice_queue(dev, head);
1464 }
1465
1466 static size_t ip6gre_get_size(const struct net_device *dev)
1467 {
1468 return
1469 /* IFLA_GRE_LINK */
1470 nla_total_size(4) +
1471 /* IFLA_GRE_IFLAGS */
1472 nla_total_size(2) +
1473 /* IFLA_GRE_OFLAGS */
1474 nla_total_size(2) +
1475 /* IFLA_GRE_IKEY */
1476 nla_total_size(4) +
1477 /* IFLA_GRE_OKEY */
1478 nla_total_size(4) +
1479 /* IFLA_GRE_LOCAL */
1480 nla_total_size(sizeof(struct in6_addr)) +
1481 /* IFLA_GRE_REMOTE */
1482 nla_total_size(sizeof(struct in6_addr)) +
1483 /* IFLA_GRE_TTL */
1484 nla_total_size(1) +
1485 /* IFLA_GRE_ENCAP_LIMIT */
1486 nla_total_size(1) +
1487 /* IFLA_GRE_FLOWINFO */
1488 nla_total_size(4) +
1489 /* IFLA_GRE_FLAGS */
1490 nla_total_size(4) +
1491 /* IFLA_GRE_ENCAP_TYPE */
1492 nla_total_size(2) +
1493 /* IFLA_GRE_ENCAP_FLAGS */
1494 nla_total_size(2) +
1495 /* IFLA_GRE_ENCAP_SPORT */
1496 nla_total_size(2) +
1497 /* IFLA_GRE_ENCAP_DPORT */
1498 nla_total_size(2) +
1499 /* IFLA_GRE_FWMARK */
1500 nla_total_size(4) +
1501 0;
1502 }
1503
1504 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
1505 {
1506 struct ip6_tnl *t = netdev_priv(dev);
1507 struct __ip6_tnl_parm *p = &t->parms;
1508
1509 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
1510 nla_put_be16(skb, IFLA_GRE_IFLAGS,
1511 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
1512 nla_put_be16(skb, IFLA_GRE_OFLAGS,
1513 gre_tnl_flags_to_gre_flags(p->o_flags)) ||
1514 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
1515 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
1516 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
1517 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
1518 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
1519 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
1520 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
1521 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
1522 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark))
1523 goto nla_put_failure;
1524
1525 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
1526 t->encap.type) ||
1527 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
1528 t->encap.sport) ||
1529 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
1530 t->encap.dport) ||
1531 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
1532 t->encap.flags))
1533 goto nla_put_failure;
1534
1535 return 0;
1536
1537 nla_put_failure:
1538 return -EMSGSIZE;
1539 }
1540
1541 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
1542 [IFLA_GRE_LINK] = { .type = NLA_U32 },
1543 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
1544 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
1545 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
1546 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
1547 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
1548 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
1549 [IFLA_GRE_TTL] = { .type = NLA_U8 },
1550 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
1551 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
1552 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
1553 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 },
1554 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
1555 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
1556 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
1557 [IFLA_GRE_FWMARK] = { .type = NLA_U32 },
1558 };
1559
1560 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
1561 .kind = "ip6gre",
1562 .maxtype = IFLA_GRE_MAX,
1563 .policy = ip6gre_policy,
1564 .priv_size = sizeof(struct ip6_tnl),
1565 .setup = ip6gre_tunnel_setup,
1566 .validate = ip6gre_tunnel_validate,
1567 .newlink = ip6gre_newlink,
1568 .changelink = ip6gre_changelink,
1569 .dellink = ip6gre_dellink,
1570 .get_size = ip6gre_get_size,
1571 .fill_info = ip6gre_fill_info,
1572 .get_link_net = ip6_tnl_get_link_net,
1573 };
1574
1575 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
1576 .kind = "ip6gretap",
1577 .maxtype = IFLA_GRE_MAX,
1578 .policy = ip6gre_policy,
1579 .priv_size = sizeof(struct ip6_tnl),
1580 .setup = ip6gre_tap_setup,
1581 .validate = ip6gre_tap_validate,
1582 .newlink = ip6gre_newlink,
1583 .changelink = ip6gre_changelink,
1584 .get_size = ip6gre_get_size,
1585 .fill_info = ip6gre_fill_info,
1586 .get_link_net = ip6_tnl_get_link_net,
1587 };
1588
1589 /*
1590 * And now the modules code and kernel interface.
1591 */
1592
1593 static int __init ip6gre_init(void)
1594 {
1595 int err;
1596
1597 pr_info("GRE over IPv6 tunneling driver\n");
1598
1599 err = register_pernet_device(&ip6gre_net_ops);
1600 if (err < 0)
1601 return err;
1602
1603 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
1604 if (err < 0) {
1605 pr_info("%s: can't add protocol\n", __func__);
1606 goto add_proto_failed;
1607 }
1608
1609 err = rtnl_link_register(&ip6gre_link_ops);
1610 if (err < 0)
1611 goto rtnl_link_failed;
1612
1613 err = rtnl_link_register(&ip6gre_tap_ops);
1614 if (err < 0)
1615 goto tap_ops_failed;
1616
1617 out:
1618 return err;
1619
1620 tap_ops_failed:
1621 rtnl_link_unregister(&ip6gre_link_ops);
1622 rtnl_link_failed:
1623 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1624 add_proto_failed:
1625 unregister_pernet_device(&ip6gre_net_ops);
1626 goto out;
1627 }
1628
1629 static void __exit ip6gre_fini(void)
1630 {
1631 rtnl_link_unregister(&ip6gre_tap_ops);
1632 rtnl_link_unregister(&ip6gre_link_ops);
1633 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1634 unregister_pernet_device(&ip6gre_net_ops);
1635 }
1636
1637 module_init(ip6gre_init);
1638 module_exit(ip6gre_fini);
1639 MODULE_LICENSE("GPL");
1640 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
1641 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
1642 MODULE_ALIAS_RTNL_LINK("ip6gre");
1643 MODULE_ALIAS_RTNL_LINK("ip6gretap");
1644 MODULE_ALIAS_NETDEV("ip6gre0");
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