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[GitHub/LineageOS/android_kernel_motorola_exynos9610.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 break;
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 }
417 break;
418 case ICMPV6_PARAMPROB:
419 teli = 0;
420 if (code == ICMPV6_HDR_FIELD)
421 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
422
423 if (teli && teli == be32_to_cpu(info) - 2) {
424 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
425 if (tel->encap_limit == 0) {
426 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
427 t->parms.name);
428 }
429 } else {
430 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
431 t->parms.name);
432 }
433 break;
434 case ICMPV6_PKT_TOOBIG:
435 mtu = be32_to_cpu(info) - offset;
436 if (mtu < IPV6_MIN_MTU)
437 mtu = IPV6_MIN_MTU;
438 t->dev->mtu = mtu;
439 break;
440 }
441
442 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
443 t->err_count++;
444 else
445 t->err_count = 1;
446 t->err_time = jiffies;
447 }
448
449 static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
450 {
451 const struct ipv6hdr *ipv6h;
452 struct ip6_tnl *tunnel;
453
454 ipv6h = ipv6_hdr(skb);
455 tunnel = ip6gre_tunnel_lookup(skb->dev,
456 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
457 tpi->proto);
458 if (tunnel) {
459 ip6_tnl_rcv(tunnel, skb, tpi, NULL, false);
460
461 return PACKET_RCVD;
462 }
463
464 return PACKET_REJECT;
465 }
466
467 static int gre_rcv(struct sk_buff *skb)
468 {
469 struct tnl_ptk_info tpi;
470 bool csum_err = false;
471 int hdr_len;
472
473 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
474 if (hdr_len < 0)
475 goto drop;
476
477 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
478 goto drop;
479
480 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
481 return 0;
482
483 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
484 drop:
485 kfree_skb(skb);
486 return 0;
487 }
488
489 static int gre_handle_offloads(struct sk_buff *skb, bool csum)
490 {
491 return iptunnel_handle_offloads(skb,
492 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
493 }
494
495 static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
496 struct net_device *dev, __u8 dsfield,
497 struct flowi6 *fl6, int encap_limit,
498 __u32 *pmtu, __be16 proto)
499 {
500 struct ip6_tnl *tunnel = netdev_priv(dev);
501 __be16 protocol = (dev->type == ARPHRD_ETHER) ?
502 htons(ETH_P_TEB) : proto;
503
504 if (dev->type == ARPHRD_ETHER)
505 IPCB(skb)->flags = 0;
506
507 if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
508 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
509 else
510 fl6->daddr = tunnel->parms.raddr;
511
512 if (tunnel->parms.o_flags & TUNNEL_SEQ)
513 tunnel->o_seqno++;
514
515 /* Push GRE header. */
516 gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags,
517 protocol, tunnel->parms.o_key, htonl(tunnel->o_seqno));
518
519 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
520 NEXTHDR_GRE);
521 }
522
523 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
524 {
525 struct ip6_tnl *t = netdev_priv(dev);
526 const struct iphdr *iph = ip_hdr(skb);
527 int encap_limit = -1;
528 struct flowi6 fl6;
529 __u8 dsfield;
530 __u32 mtu;
531 int err;
532
533 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
534
535 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
536 encap_limit = t->parms.encap_limit;
537
538 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
539
540 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
541 dsfield = ipv4_get_dsfield(iph);
542 else
543 dsfield = ip6_tclass(t->parms.flowinfo);
544 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
545 fl6.flowi6_mark = skb->mark;
546 else
547 fl6.flowi6_mark = t->parms.fwmark;
548
549 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
550
551 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
552 if (err)
553 return -1;
554
555 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
556 skb->protocol);
557 if (err != 0) {
558 /* XXX: send ICMP error even if DF is not set. */
559 if (err == -EMSGSIZE)
560 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
561 htonl(mtu));
562 return -1;
563 }
564
565 return 0;
566 }
567
568 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
569 {
570 struct ip6_tnl *t = netdev_priv(dev);
571 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
572 int encap_limit = -1;
573 __u16 offset;
574 struct flowi6 fl6;
575 __u8 dsfield;
576 __u32 mtu;
577 int err;
578
579 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
580 return -1;
581
582 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
583 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
584 ipv6h = ipv6_hdr(skb);
585
586 if (offset > 0) {
587 struct ipv6_tlv_tnl_enc_lim *tel;
588 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
589 if (tel->encap_limit == 0) {
590 icmpv6_send(skb, ICMPV6_PARAMPROB,
591 ICMPV6_HDR_FIELD, offset + 2);
592 return -1;
593 }
594 encap_limit = tel->encap_limit - 1;
595 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
596 encap_limit = t->parms.encap_limit;
597
598 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
599
600 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
601 dsfield = ipv6_get_dsfield(ipv6h);
602 else
603 dsfield = ip6_tclass(t->parms.flowinfo);
604
605 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
606 fl6.flowlabel |= ip6_flowlabel(ipv6h);
607 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
608 fl6.flowi6_mark = skb->mark;
609 else
610 fl6.flowi6_mark = t->parms.fwmark;
611
612 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
613
614 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
615 return -1;
616
617 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
618 &mtu, skb->protocol);
619 if (err != 0) {
620 if (err == -EMSGSIZE)
621 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
622 return -1;
623 }
624
625 return 0;
626 }
627
628 /**
629 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
630 * @t: the outgoing tunnel device
631 * @hdr: IPv6 header from the incoming packet
632 *
633 * Description:
634 * Avoid trivial tunneling loop by checking that tunnel exit-point
635 * doesn't match source of incoming packet.
636 *
637 * Return:
638 * 1 if conflict,
639 * 0 else
640 **/
641
642 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
643 const struct ipv6hdr *hdr)
644 {
645 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
646 }
647
648 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
649 {
650 struct ip6_tnl *t = netdev_priv(dev);
651 int encap_limit = -1;
652 struct flowi6 fl6;
653 __u32 mtu;
654 int err;
655
656 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
657 encap_limit = t->parms.encap_limit;
658
659 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
660
661 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
662 if (err)
663 return err;
664
665 err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol);
666
667 return err;
668 }
669
670 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
671 struct net_device *dev)
672 {
673 struct ip6_tnl *t = netdev_priv(dev);
674 struct net_device_stats *stats = &t->dev->stats;
675 int ret;
676
677 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
678 goto tx_err;
679
680 switch (skb->protocol) {
681 case htons(ETH_P_IP):
682 ret = ip6gre_xmit_ipv4(skb, dev);
683 break;
684 case htons(ETH_P_IPV6):
685 ret = ip6gre_xmit_ipv6(skb, dev);
686 break;
687 default:
688 ret = ip6gre_xmit_other(skb, dev);
689 break;
690 }
691
692 if (ret < 0)
693 goto tx_err;
694
695 return NETDEV_TX_OK;
696
697 tx_err:
698 stats->tx_errors++;
699 stats->tx_dropped++;
700 kfree_skb(skb);
701 return NETDEV_TX_OK;
702 }
703
704 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
705 {
706 struct net_device *dev = t->dev;
707 struct __ip6_tnl_parm *p = &t->parms;
708 struct flowi6 *fl6 = &t->fl.u.ip6;
709 int t_hlen;
710
711 if (dev->type != ARPHRD_ETHER) {
712 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
713 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
714 }
715
716 /* Set up flowi template */
717 fl6->saddr = p->laddr;
718 fl6->daddr = p->raddr;
719 fl6->flowi6_oif = p->link;
720 fl6->flowlabel = 0;
721 fl6->flowi6_proto = IPPROTO_GRE;
722
723 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
724 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
725 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
726 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
727
728 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
729 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
730
731 if (p->flags&IP6_TNL_F_CAP_XMIT &&
732 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
733 dev->flags |= IFF_POINTOPOINT;
734 else
735 dev->flags &= ~IFF_POINTOPOINT;
736
737 t->tun_hlen = gre_calc_hlen(t->parms.o_flags);
738
739 t->hlen = t->encap_hlen + t->tun_hlen;
740
741 t_hlen = t->hlen + sizeof(struct ipv6hdr);
742
743 if (p->flags & IP6_TNL_F_CAP_XMIT) {
744 int strict = (ipv6_addr_type(&p->raddr) &
745 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
746
747 struct rt6_info *rt = rt6_lookup(t->net,
748 &p->raddr, &p->laddr,
749 p->link, strict);
750
751 if (!rt)
752 return;
753
754 if (rt->dst.dev) {
755 dev->hard_header_len = rt->dst.dev->hard_header_len +
756 t_hlen;
757
758 if (set_mtu) {
759 dev->mtu = rt->dst.dev->mtu - t_hlen;
760 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
761 dev->mtu -= 8;
762 if (dev->type == ARPHRD_ETHER)
763 dev->mtu -= ETH_HLEN;
764
765 if (dev->mtu < IPV6_MIN_MTU)
766 dev->mtu = IPV6_MIN_MTU;
767 }
768 }
769 ip6_rt_put(rt);
770 }
771 }
772
773 static int ip6gre_tnl_change(struct ip6_tnl *t,
774 const struct __ip6_tnl_parm *p, int set_mtu)
775 {
776 t->parms.laddr = p->laddr;
777 t->parms.raddr = p->raddr;
778 t->parms.flags = p->flags;
779 t->parms.hop_limit = p->hop_limit;
780 t->parms.encap_limit = p->encap_limit;
781 t->parms.flowinfo = p->flowinfo;
782 t->parms.link = p->link;
783 t->parms.proto = p->proto;
784 t->parms.i_key = p->i_key;
785 t->parms.o_key = p->o_key;
786 t->parms.i_flags = p->i_flags;
787 t->parms.o_flags = p->o_flags;
788 t->parms.fwmark = p->fwmark;
789 dst_cache_reset(&t->dst_cache);
790 ip6gre_tnl_link_config(t, set_mtu);
791 return 0;
792 }
793
794 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
795 const struct ip6_tnl_parm2 *u)
796 {
797 p->laddr = u->laddr;
798 p->raddr = u->raddr;
799 p->flags = u->flags;
800 p->hop_limit = u->hop_limit;
801 p->encap_limit = u->encap_limit;
802 p->flowinfo = u->flowinfo;
803 p->link = u->link;
804 p->i_key = u->i_key;
805 p->o_key = u->o_key;
806 p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
807 p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
808 memcpy(p->name, u->name, sizeof(u->name));
809 }
810
811 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
812 const struct __ip6_tnl_parm *p)
813 {
814 u->proto = IPPROTO_GRE;
815 u->laddr = p->laddr;
816 u->raddr = p->raddr;
817 u->flags = p->flags;
818 u->hop_limit = p->hop_limit;
819 u->encap_limit = p->encap_limit;
820 u->flowinfo = p->flowinfo;
821 u->link = p->link;
822 u->i_key = p->i_key;
823 u->o_key = p->o_key;
824 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
825 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
826 memcpy(u->name, p->name, sizeof(u->name));
827 }
828
829 static int ip6gre_tunnel_ioctl(struct net_device *dev,
830 struct ifreq *ifr, int cmd)
831 {
832 int err = 0;
833 struct ip6_tnl_parm2 p;
834 struct __ip6_tnl_parm p1;
835 struct ip6_tnl *t = netdev_priv(dev);
836 struct net *net = t->net;
837 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
838
839 memset(&p1, 0, sizeof(p1));
840
841 switch (cmd) {
842 case SIOCGETTUNNEL:
843 if (dev == ign->fb_tunnel_dev) {
844 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
845 err = -EFAULT;
846 break;
847 }
848 ip6gre_tnl_parm_from_user(&p1, &p);
849 t = ip6gre_tunnel_locate(net, &p1, 0);
850 if (!t)
851 t = netdev_priv(dev);
852 }
853 memset(&p, 0, sizeof(p));
854 ip6gre_tnl_parm_to_user(&p, &t->parms);
855 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
856 err = -EFAULT;
857 break;
858
859 case SIOCADDTUNNEL:
860 case SIOCCHGTUNNEL:
861 err = -EPERM;
862 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
863 goto done;
864
865 err = -EFAULT;
866 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
867 goto done;
868
869 err = -EINVAL;
870 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
871 goto done;
872
873 if (!(p.i_flags&GRE_KEY))
874 p.i_key = 0;
875 if (!(p.o_flags&GRE_KEY))
876 p.o_key = 0;
877
878 ip6gre_tnl_parm_from_user(&p1, &p);
879 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
880
881 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
882 if (t) {
883 if (t->dev != dev) {
884 err = -EEXIST;
885 break;
886 }
887 } else {
888 t = netdev_priv(dev);
889
890 ip6gre_tunnel_unlink(ign, t);
891 synchronize_net();
892 ip6gre_tnl_change(t, &p1, 1);
893 ip6gre_tunnel_link(ign, t);
894 netdev_state_change(dev);
895 }
896 }
897
898 if (t) {
899 err = 0;
900
901 memset(&p, 0, sizeof(p));
902 ip6gre_tnl_parm_to_user(&p, &t->parms);
903 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
904 err = -EFAULT;
905 } else
906 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
907 break;
908
909 case SIOCDELTUNNEL:
910 err = -EPERM;
911 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
912 goto done;
913
914 if (dev == ign->fb_tunnel_dev) {
915 err = -EFAULT;
916 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
917 goto done;
918 err = -ENOENT;
919 ip6gre_tnl_parm_from_user(&p1, &p);
920 t = ip6gre_tunnel_locate(net, &p1, 0);
921 if (!t)
922 goto done;
923 err = -EPERM;
924 if (t == netdev_priv(ign->fb_tunnel_dev))
925 goto done;
926 dev = t->dev;
927 }
928 unregister_netdevice(dev);
929 err = 0;
930 break;
931
932 default:
933 err = -EINVAL;
934 }
935
936 done:
937 return err;
938 }
939
940 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
941 unsigned short type,
942 const void *daddr, const void *saddr, unsigned int len)
943 {
944 struct ip6_tnl *t = netdev_priv(dev);
945 struct ipv6hdr *ipv6h = (struct ipv6hdr *)skb_push(skb, t->hlen);
946 __be16 *p = (__be16 *)(ipv6h+1);
947
948 ip6_flow_hdr(ipv6h, 0,
949 ip6_make_flowlabel(dev_net(dev), skb,
950 t->fl.u.ip6.flowlabel, true,
951 &t->fl.u.ip6));
952 ipv6h->hop_limit = t->parms.hop_limit;
953 ipv6h->nexthdr = NEXTHDR_GRE;
954 ipv6h->saddr = t->parms.laddr;
955 ipv6h->daddr = t->parms.raddr;
956
957 p[0] = t->parms.o_flags;
958 p[1] = htons(type);
959
960 /*
961 * Set the source hardware address.
962 */
963
964 if (saddr)
965 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
966 if (daddr)
967 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
968 if (!ipv6_addr_any(&ipv6h->daddr))
969 return t->hlen;
970
971 return -t->hlen;
972 }
973
974 static const struct header_ops ip6gre_header_ops = {
975 .create = ip6gre_header,
976 };
977
978 static const struct net_device_ops ip6gre_netdev_ops = {
979 .ndo_init = ip6gre_tunnel_init,
980 .ndo_uninit = ip6gre_tunnel_uninit,
981 .ndo_start_xmit = ip6gre_tunnel_xmit,
982 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
983 .ndo_change_mtu = ip6_tnl_change_mtu,
984 .ndo_get_stats64 = ip_tunnel_get_stats64,
985 .ndo_get_iflink = ip6_tnl_get_iflink,
986 };
987
988 static void ip6gre_dev_free(struct net_device *dev)
989 {
990 struct ip6_tnl *t = netdev_priv(dev);
991
992 dst_cache_destroy(&t->dst_cache);
993 free_percpu(dev->tstats);
994 free_netdev(dev);
995 }
996
997 static void ip6gre_tunnel_setup(struct net_device *dev)
998 {
999 dev->netdev_ops = &ip6gre_netdev_ops;
1000 dev->destructor = ip6gre_dev_free;
1001
1002 dev->type = ARPHRD_IP6GRE;
1003
1004 dev->flags |= IFF_NOARP;
1005 dev->addr_len = sizeof(struct in6_addr);
1006 netif_keep_dst(dev);
1007 /* This perm addr will be used as interface identifier by IPv6 */
1008 dev->addr_assign_type = NET_ADDR_RANDOM;
1009 eth_random_addr(dev->perm_addr);
1010 }
1011
1012 static int ip6gre_tunnel_init_common(struct net_device *dev)
1013 {
1014 struct ip6_tnl *tunnel;
1015 int ret;
1016 int t_hlen;
1017
1018 tunnel = netdev_priv(dev);
1019
1020 tunnel->dev = dev;
1021 tunnel->net = dev_net(dev);
1022 strcpy(tunnel->parms.name, dev->name);
1023
1024 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1025 if (!dev->tstats)
1026 return -ENOMEM;
1027
1028 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1029 if (ret) {
1030 free_percpu(dev->tstats);
1031 dev->tstats = NULL;
1032 return ret;
1033 }
1034
1035 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1036 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1037 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1038
1039 dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1040 dev->mtu = ETH_DATA_LEN - t_hlen;
1041 if (dev->type == ARPHRD_ETHER)
1042 dev->mtu -= ETH_HLEN;
1043 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1044 dev->mtu -= 8;
1045
1046 return 0;
1047 }
1048
1049 static int ip6gre_tunnel_init(struct net_device *dev)
1050 {
1051 struct ip6_tnl *tunnel;
1052 int ret;
1053
1054 ret = ip6gre_tunnel_init_common(dev);
1055 if (ret)
1056 return ret;
1057
1058 tunnel = netdev_priv(dev);
1059
1060 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1061 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1062
1063 if (ipv6_addr_any(&tunnel->parms.raddr))
1064 dev->header_ops = &ip6gre_header_ops;
1065
1066 return 0;
1067 }
1068
1069 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1070 {
1071 struct ip6_tnl *tunnel = netdev_priv(dev);
1072
1073 tunnel->dev = dev;
1074 tunnel->net = dev_net(dev);
1075 strcpy(tunnel->parms.name, dev->name);
1076
1077 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1078
1079 dev_hold(dev);
1080 }
1081
1082
1083 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1084 .handler = gre_rcv,
1085 .err_handler = ip6gre_err,
1086 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1087 };
1088
1089 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1090 {
1091 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1092 struct net_device *dev, *aux;
1093 int prio;
1094
1095 for_each_netdev_safe(net, dev, aux)
1096 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1097 dev->rtnl_link_ops == &ip6gre_tap_ops)
1098 unregister_netdevice_queue(dev, head);
1099
1100 for (prio = 0; prio < 4; prio++) {
1101 int h;
1102 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1103 struct ip6_tnl *t;
1104
1105 t = rtnl_dereference(ign->tunnels[prio][h]);
1106
1107 while (t) {
1108 /* If dev is in the same netns, it has already
1109 * been added to the list by the previous loop.
1110 */
1111 if (!net_eq(dev_net(t->dev), net))
1112 unregister_netdevice_queue(t->dev,
1113 head);
1114 t = rtnl_dereference(t->next);
1115 }
1116 }
1117 }
1118 }
1119
1120 static int __net_init ip6gre_init_net(struct net *net)
1121 {
1122 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1123 int err;
1124
1125 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1126 NET_NAME_UNKNOWN,
1127 ip6gre_tunnel_setup);
1128 if (!ign->fb_tunnel_dev) {
1129 err = -ENOMEM;
1130 goto err_alloc_dev;
1131 }
1132 dev_net_set(ign->fb_tunnel_dev, net);
1133 /* FB netdevice is special: we have one, and only one per netns.
1134 * Allowing to move it to another netns is clearly unsafe.
1135 */
1136 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1137
1138
1139 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1140 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1141
1142 err = register_netdev(ign->fb_tunnel_dev);
1143 if (err)
1144 goto err_reg_dev;
1145
1146 rcu_assign_pointer(ign->tunnels_wc[0],
1147 netdev_priv(ign->fb_tunnel_dev));
1148 return 0;
1149
1150 err_reg_dev:
1151 ip6gre_dev_free(ign->fb_tunnel_dev);
1152 err_alloc_dev:
1153 return err;
1154 }
1155
1156 static void __net_exit ip6gre_exit_net(struct net *net)
1157 {
1158 LIST_HEAD(list);
1159
1160 rtnl_lock();
1161 ip6gre_destroy_tunnels(net, &list);
1162 unregister_netdevice_many(&list);
1163 rtnl_unlock();
1164 }
1165
1166 static struct pernet_operations ip6gre_net_ops = {
1167 .init = ip6gre_init_net,
1168 .exit = ip6gre_exit_net,
1169 .id = &ip6gre_net_id,
1170 .size = sizeof(struct ip6gre_net),
1171 };
1172
1173 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
1174 {
1175 __be16 flags;
1176
1177 if (!data)
1178 return 0;
1179
1180 flags = 0;
1181 if (data[IFLA_GRE_IFLAGS])
1182 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1183 if (data[IFLA_GRE_OFLAGS])
1184 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1185 if (flags & (GRE_VERSION|GRE_ROUTING))
1186 return -EINVAL;
1187
1188 return 0;
1189 }
1190
1191 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[])
1192 {
1193 struct in6_addr daddr;
1194
1195 if (tb[IFLA_ADDRESS]) {
1196 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1197 return -EINVAL;
1198 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1199 return -EADDRNOTAVAIL;
1200 }
1201
1202 if (!data)
1203 goto out;
1204
1205 if (data[IFLA_GRE_REMOTE]) {
1206 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1207 if (ipv6_addr_any(&daddr))
1208 return -EINVAL;
1209 }
1210
1211 out:
1212 return ip6gre_tunnel_validate(tb, data);
1213 }
1214
1215
1216 static void ip6gre_netlink_parms(struct nlattr *data[],
1217 struct __ip6_tnl_parm *parms)
1218 {
1219 memset(parms, 0, sizeof(*parms));
1220
1221 if (!data)
1222 return;
1223
1224 if (data[IFLA_GRE_LINK])
1225 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1226
1227 if (data[IFLA_GRE_IFLAGS])
1228 parms->i_flags = gre_flags_to_tnl_flags(
1229 nla_get_be16(data[IFLA_GRE_IFLAGS]));
1230
1231 if (data[IFLA_GRE_OFLAGS])
1232 parms->o_flags = gre_flags_to_tnl_flags(
1233 nla_get_be16(data[IFLA_GRE_OFLAGS]));
1234
1235 if (data[IFLA_GRE_IKEY])
1236 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1237
1238 if (data[IFLA_GRE_OKEY])
1239 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1240
1241 if (data[IFLA_GRE_LOCAL])
1242 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1243
1244 if (data[IFLA_GRE_REMOTE])
1245 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1246
1247 if (data[IFLA_GRE_TTL])
1248 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1249
1250 if (data[IFLA_GRE_ENCAP_LIMIT])
1251 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1252
1253 if (data[IFLA_GRE_FLOWINFO])
1254 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1255
1256 if (data[IFLA_GRE_FLAGS])
1257 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1258
1259 if (data[IFLA_GRE_FWMARK])
1260 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1261 }
1262
1263 static int ip6gre_tap_init(struct net_device *dev)
1264 {
1265 struct ip6_tnl *tunnel;
1266 int ret;
1267
1268 ret = ip6gre_tunnel_init_common(dev);
1269 if (ret)
1270 return ret;
1271
1272 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1273
1274 tunnel = netdev_priv(dev);
1275
1276 ip6gre_tnl_link_config(tunnel, 1);
1277
1278 return 0;
1279 }
1280
1281 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1282 .ndo_init = ip6gre_tap_init,
1283 .ndo_uninit = ip6gre_tunnel_uninit,
1284 .ndo_start_xmit = ip6gre_tunnel_xmit,
1285 .ndo_set_mac_address = eth_mac_addr,
1286 .ndo_validate_addr = eth_validate_addr,
1287 .ndo_change_mtu = ip6_tnl_change_mtu,
1288 .ndo_get_stats64 = ip_tunnel_get_stats64,
1289 .ndo_get_iflink = ip6_tnl_get_iflink,
1290 };
1291
1292 #define GRE6_FEATURES (NETIF_F_SG | \
1293 NETIF_F_FRAGLIST | \
1294 NETIF_F_HIGHDMA | \
1295 NETIF_F_HW_CSUM)
1296
1297 static void ip6gre_tap_setup(struct net_device *dev)
1298 {
1299
1300 ether_setup(dev);
1301
1302 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1303 dev->destructor = ip6gre_dev_free;
1304
1305 dev->features |= NETIF_F_NETNS_LOCAL;
1306 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1307 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1308 }
1309
1310 static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1311 struct ip_tunnel_encap *ipencap)
1312 {
1313 bool ret = false;
1314
1315 memset(ipencap, 0, sizeof(*ipencap));
1316
1317 if (!data)
1318 return ret;
1319
1320 if (data[IFLA_GRE_ENCAP_TYPE]) {
1321 ret = true;
1322 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1323 }
1324
1325 if (data[IFLA_GRE_ENCAP_FLAGS]) {
1326 ret = true;
1327 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1328 }
1329
1330 if (data[IFLA_GRE_ENCAP_SPORT]) {
1331 ret = true;
1332 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1333 }
1334
1335 if (data[IFLA_GRE_ENCAP_DPORT]) {
1336 ret = true;
1337 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1338 }
1339
1340 return ret;
1341 }
1342
1343 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1344 struct nlattr *tb[], struct nlattr *data[])
1345 {
1346 struct ip6_tnl *nt;
1347 struct net *net = dev_net(dev);
1348 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1349 struct ip_tunnel_encap ipencap;
1350 int err;
1351
1352 nt = netdev_priv(dev);
1353
1354 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1355 int err = ip6_tnl_encap_setup(nt, &ipencap);
1356
1357 if (err < 0)
1358 return err;
1359 }
1360
1361 ip6gre_netlink_parms(data, &nt->parms);
1362
1363 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1364 return -EEXIST;
1365
1366 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1367 eth_hw_addr_random(dev);
1368
1369 nt->dev = dev;
1370 nt->net = dev_net(dev);
1371 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1372
1373 dev->features |= GRE6_FEATURES;
1374 dev->hw_features |= GRE6_FEATURES;
1375
1376 if (!(nt->parms.o_flags & TUNNEL_SEQ)) {
1377 /* TCP offload with GRE SEQ is not supported, nor
1378 * can we support 2 levels of outer headers requiring
1379 * an update.
1380 */
1381 if (!(nt->parms.o_flags & TUNNEL_CSUM) ||
1382 (nt->encap.type == TUNNEL_ENCAP_NONE)) {
1383 dev->features |= NETIF_F_GSO_SOFTWARE;
1384 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1385 }
1386
1387 /* Can use a lockless transmit, unless we generate
1388 * output sequences
1389 */
1390 dev->features |= NETIF_F_LLTX;
1391 }
1392
1393 err = register_netdevice(dev);
1394 if (err)
1395 goto out;
1396
1397 dev_hold(dev);
1398 ip6gre_tunnel_link(ign, nt);
1399
1400 out:
1401 return err;
1402 }
1403
1404 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
1405 struct nlattr *data[])
1406 {
1407 struct ip6_tnl *t, *nt = netdev_priv(dev);
1408 struct net *net = nt->net;
1409 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1410 struct __ip6_tnl_parm p;
1411 struct ip_tunnel_encap ipencap;
1412
1413 if (dev == ign->fb_tunnel_dev)
1414 return -EINVAL;
1415
1416 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1417 int err = ip6_tnl_encap_setup(nt, &ipencap);
1418
1419 if (err < 0)
1420 return err;
1421 }
1422
1423 ip6gre_netlink_parms(data, &p);
1424
1425 t = ip6gre_tunnel_locate(net, &p, 0);
1426
1427 if (t) {
1428 if (t->dev != dev)
1429 return -EEXIST;
1430 } else {
1431 t = nt;
1432 }
1433
1434 ip6gre_tunnel_unlink(ign, t);
1435 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
1436 ip6gre_tunnel_link(ign, t);
1437 return 0;
1438 }
1439
1440 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
1441 {
1442 struct net *net = dev_net(dev);
1443 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1444
1445 if (dev != ign->fb_tunnel_dev)
1446 unregister_netdevice_queue(dev, head);
1447 }
1448
1449 static size_t ip6gre_get_size(const struct net_device *dev)
1450 {
1451 return
1452 /* IFLA_GRE_LINK */
1453 nla_total_size(4) +
1454 /* IFLA_GRE_IFLAGS */
1455 nla_total_size(2) +
1456 /* IFLA_GRE_OFLAGS */
1457 nla_total_size(2) +
1458 /* IFLA_GRE_IKEY */
1459 nla_total_size(4) +
1460 /* IFLA_GRE_OKEY */
1461 nla_total_size(4) +
1462 /* IFLA_GRE_LOCAL */
1463 nla_total_size(sizeof(struct in6_addr)) +
1464 /* IFLA_GRE_REMOTE */
1465 nla_total_size(sizeof(struct in6_addr)) +
1466 /* IFLA_GRE_TTL */
1467 nla_total_size(1) +
1468 /* IFLA_GRE_ENCAP_LIMIT */
1469 nla_total_size(1) +
1470 /* IFLA_GRE_FLOWINFO */
1471 nla_total_size(4) +
1472 /* IFLA_GRE_FLAGS */
1473 nla_total_size(4) +
1474 /* IFLA_GRE_ENCAP_TYPE */
1475 nla_total_size(2) +
1476 /* IFLA_GRE_ENCAP_FLAGS */
1477 nla_total_size(2) +
1478 /* IFLA_GRE_ENCAP_SPORT */
1479 nla_total_size(2) +
1480 /* IFLA_GRE_ENCAP_DPORT */
1481 nla_total_size(2) +
1482 /* IFLA_GRE_FWMARK */
1483 nla_total_size(4) +
1484 0;
1485 }
1486
1487 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
1488 {
1489 struct ip6_tnl *t = netdev_priv(dev);
1490 struct __ip6_tnl_parm *p = &t->parms;
1491
1492 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
1493 nla_put_be16(skb, IFLA_GRE_IFLAGS,
1494 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
1495 nla_put_be16(skb, IFLA_GRE_OFLAGS,
1496 gre_tnl_flags_to_gre_flags(p->o_flags)) ||
1497 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
1498 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
1499 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
1500 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
1501 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
1502 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
1503 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
1504 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
1505 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark))
1506 goto nla_put_failure;
1507
1508 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
1509 t->encap.type) ||
1510 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
1511 t->encap.sport) ||
1512 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
1513 t->encap.dport) ||
1514 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
1515 t->encap.flags))
1516 goto nla_put_failure;
1517
1518 return 0;
1519
1520 nla_put_failure:
1521 return -EMSGSIZE;
1522 }
1523
1524 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
1525 [IFLA_GRE_LINK] = { .type = NLA_U32 },
1526 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
1527 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
1528 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
1529 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
1530 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
1531 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
1532 [IFLA_GRE_TTL] = { .type = NLA_U8 },
1533 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
1534 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
1535 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
1536 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 },
1537 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
1538 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
1539 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
1540 [IFLA_GRE_FWMARK] = { .type = NLA_U32 },
1541 };
1542
1543 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
1544 .kind = "ip6gre",
1545 .maxtype = IFLA_GRE_MAX,
1546 .policy = ip6gre_policy,
1547 .priv_size = sizeof(struct ip6_tnl),
1548 .setup = ip6gre_tunnel_setup,
1549 .validate = ip6gre_tunnel_validate,
1550 .newlink = ip6gre_newlink,
1551 .changelink = ip6gre_changelink,
1552 .dellink = ip6gre_dellink,
1553 .get_size = ip6gre_get_size,
1554 .fill_info = ip6gre_fill_info,
1555 .get_link_net = ip6_tnl_get_link_net,
1556 };
1557
1558 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
1559 .kind = "ip6gretap",
1560 .maxtype = IFLA_GRE_MAX,
1561 .policy = ip6gre_policy,
1562 .priv_size = sizeof(struct ip6_tnl),
1563 .setup = ip6gre_tap_setup,
1564 .validate = ip6gre_tap_validate,
1565 .newlink = ip6gre_newlink,
1566 .changelink = ip6gre_changelink,
1567 .get_size = ip6gre_get_size,
1568 .fill_info = ip6gre_fill_info,
1569 .get_link_net = ip6_tnl_get_link_net,
1570 };
1571
1572 /*
1573 * And now the modules code and kernel interface.
1574 */
1575
1576 static int __init ip6gre_init(void)
1577 {
1578 int err;
1579
1580 pr_info("GRE over IPv6 tunneling driver\n");
1581
1582 err = register_pernet_device(&ip6gre_net_ops);
1583 if (err < 0)
1584 return err;
1585
1586 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
1587 if (err < 0) {
1588 pr_info("%s: can't add protocol\n", __func__);
1589 goto add_proto_failed;
1590 }
1591
1592 err = rtnl_link_register(&ip6gre_link_ops);
1593 if (err < 0)
1594 goto rtnl_link_failed;
1595
1596 err = rtnl_link_register(&ip6gre_tap_ops);
1597 if (err < 0)
1598 goto tap_ops_failed;
1599
1600 out:
1601 return err;
1602
1603 tap_ops_failed:
1604 rtnl_link_unregister(&ip6gre_link_ops);
1605 rtnl_link_failed:
1606 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1607 add_proto_failed:
1608 unregister_pernet_device(&ip6gre_net_ops);
1609 goto out;
1610 }
1611
1612 static void __exit ip6gre_fini(void)
1613 {
1614 rtnl_link_unregister(&ip6gre_tap_ops);
1615 rtnl_link_unregister(&ip6gre_link_ops);
1616 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1617 unregister_pernet_device(&ip6gre_net_ops);
1618 }
1619
1620 module_init(ip6gre_init);
1621 module_exit(ip6gre_fini);
1622 MODULE_LICENSE("GPL");
1623 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
1624 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
1625 MODULE_ALIAS_RTNL_LINK("ip6gre");
1626 MODULE_ALIAS_RTNL_LINK("ip6gretap");
1627 MODULE_ALIAS_NETDEV("ip6gre0");