]> git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - net/ipv6/sit.c
projects / mirror_ubuntu-artful-kernel.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
ipv4 tunnels: fix an oops when using ipip/sit with IPsec
[mirror_ubuntu-artful-kernel.git] / net / ipv6 / sit.c
1 /*
2 * IPv6 over IPv4 tunnel device - Simple Internet Transition (SIT)
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 *
14 * Changes:
15 * Roger Venning <r.venning@telstra.com>: 6to4 support
16 * Nate Thompson <nate@thebog.net>: 6to4 support
17 * Fred Templin <fred.l.templin@boeing.com>: isatap support
18 */
19
20 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
21
22 #include <linux/module.h>
23 #include <linux/capability.h>
24 #include <linux/errno.h>
25 #include <linux/types.h>
26 #include <linux/socket.h>
27 #include <linux/sockios.h>
28 #include <linux/net.h>
29 #include <linux/in6.h>
30 #include <linux/netdevice.h>
31 #include <linux/if_arp.h>
32 #include <linux/icmp.h>
33 #include <linux/slab.h>
34 #include <asm/uaccess.h>
35 #include <linux/init.h>
36 #include <linux/netfilter_ipv4.h>
37 #include <linux/if_ether.h>
38
39 #include <net/sock.h>
40 #include <net/snmp.h>
41
42 #include <net/ipv6.h>
43 #include <net/protocol.h>
44 #include <net/transp_v6.h>
45 #include <net/ip6_fib.h>
46 #include <net/ip6_route.h>
47 #include <net/ndisc.h>
48 #include <net/addrconf.h>
49 #include <net/ip.h>
50 #include <net/udp.h>
51 #include <net/icmp.h>
52 #include <net/ip_tunnels.h>
53 #include <net/inet_ecn.h>
54 #include <net/xfrm.h>
55 #include <net/dsfield.h>
56 #include <net/net_namespace.h>
57 #include <net/netns/generic.h>
58
59 /*
60 This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c
61
62 For comments look at net/ipv4/ip_gre.c --ANK
63 */
64
65 #define HASH_SIZE 16
66 #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF)
67
68 static bool log_ecn_error = true;
69 module_param(log_ecn_error, bool, 0644);
70 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
71
72 static int ipip6_tunnel_init(struct net_device *dev);
73 static void ipip6_tunnel_setup(struct net_device *dev);
74 static void ipip6_dev_free(struct net_device *dev);
75 static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst,
76 __be32 *v4dst);
77 static struct rtnl_link_ops sit_link_ops __read_mostly;
78
79 static int sit_net_id __read_mostly;
80 struct sit_net {
81 struct ip_tunnel __rcu *tunnels_r_l[HASH_SIZE];
82 struct ip_tunnel __rcu *tunnels_r[HASH_SIZE];
83 struct ip_tunnel __rcu *tunnels_l[HASH_SIZE];
84 struct ip_tunnel __rcu *tunnels_wc[1];
85 struct ip_tunnel __rcu **tunnels[4];
86
87 struct net_device *fb_tunnel_dev;
88 };
89
90 /*
91 * Must be invoked with rcu_read_lock
92 */
93 static struct ip_tunnel *ipip6_tunnel_lookup(struct net *net,
94 struct net_device *dev, __be32 remote, __be32 local)
95 {
96 unsigned int h0 = HASH(remote);
97 unsigned int h1 = HASH(local);
98 struct ip_tunnel *t;
99 struct sit_net *sitn = net_generic(net, sit_net_id);
100
101 for_each_ip_tunnel_rcu(t, sitn->tunnels_r_l[h0 ^ h1]) {
102 if (local == t->parms.iph.saddr &&
103 remote == t->parms.iph.daddr &&
104 (!dev || !t->parms.link || dev->iflink == t->parms.link) &&
105 (t->dev->flags & IFF_UP))
106 return t;
107 }
108 for_each_ip_tunnel_rcu(t, sitn->tunnels_r[h0]) {
109 if (remote == t->parms.iph.daddr &&
110 (!dev || !t->parms.link || dev->iflink == t->parms.link) &&
111 (t->dev->flags & IFF_UP))
112 return t;
113 }
114 for_each_ip_tunnel_rcu(t, sitn->tunnels_l[h1]) {
115 if (local == t->parms.iph.saddr &&
116 (!dev || !t->parms.link || dev->iflink == t->parms.link) &&
117 (t->dev->flags & IFF_UP))
118 return t;
119 }
120 t = rcu_dereference(sitn->tunnels_wc[0]);
121 if ((t != NULL) && (t->dev->flags & IFF_UP))
122 return t;
123 return NULL;
124 }
125
126 static struct ip_tunnel __rcu **__ipip6_bucket(struct sit_net *sitn,
127 struct ip_tunnel_parm *parms)
128 {
129 __be32 remote = parms->iph.daddr;
130 __be32 local = parms->iph.saddr;
131 unsigned int h = 0;
132 int prio = 0;
133
134 if (remote) {
135 prio |= 2;
136 h ^= HASH(remote);
137 }
138 if (local) {
139 prio |= 1;
140 h ^= HASH(local);
141 }
142 return &sitn->tunnels[prio][h];
143 }
144
145 static inline struct ip_tunnel __rcu **ipip6_bucket(struct sit_net *sitn,
146 struct ip_tunnel *t)
147 {
148 return __ipip6_bucket(sitn, &t->parms);
149 }
150
151 static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t)
152 {
153 struct ip_tunnel __rcu **tp;
154 struct ip_tunnel *iter;
155
156 for (tp = ipip6_bucket(sitn, t);
157 (iter = rtnl_dereference(*tp)) != NULL;
158 tp = &iter->next) {
159 if (t == iter) {
160 rcu_assign_pointer(*tp, t->next);
161 break;
162 }
163 }
164 }
165
166 static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t)
167 {
168 struct ip_tunnel __rcu **tp = ipip6_bucket(sitn, t);
169
170 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
171 rcu_assign_pointer(*tp, t);
172 }
173
174 static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn)
175 {
176 #ifdef CONFIG_IPV6_SIT_6RD
177 struct ip_tunnel *t = netdev_priv(dev);
178
179 if (t->dev == sitn->fb_tunnel_dev) {
180 ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0);
181 t->ip6rd.relay_prefix = 0;
182 t->ip6rd.prefixlen = 16;
183 t->ip6rd.relay_prefixlen = 0;
184 } else {
185 struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev);
186 memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd));
187 }
188 #endif
189 }
190
191 static int ipip6_tunnel_create(struct net_device *dev)
192 {
193 struct ip_tunnel *t = netdev_priv(dev);
194 struct net *net = dev_net(dev);
195 struct sit_net *sitn = net_generic(net, sit_net_id);
196 int err;
197
198 err = ipip6_tunnel_init(dev);
199 if (err < 0)
200 goto out;
201 ipip6_tunnel_clone_6rd(dev, sitn);
202
203 if ((__force u16)t->parms.i_flags & SIT_ISATAP)
204 dev->priv_flags |= IFF_ISATAP;
205
206 err = register_netdevice(dev);
207 if (err < 0)
208 goto out;
209
210 strcpy(t->parms.name, dev->name);
211 dev->rtnl_link_ops = &sit_link_ops;
212
213 dev_hold(dev);
214
215 ipip6_tunnel_link(sitn, t);
216 return 0;
217
218 out:
219 return err;
220 }
221
222 static struct ip_tunnel *ipip6_tunnel_locate(struct net *net,
223 struct ip_tunnel_parm *parms, int create)
224 {
225 __be32 remote = parms->iph.daddr;
226 __be32 local = parms->iph.saddr;
227 struct ip_tunnel *t, *nt;
228 struct ip_tunnel __rcu **tp;
229 struct net_device *dev;
230 char name[IFNAMSIZ];
231 struct sit_net *sitn = net_generic(net, sit_net_id);
232
233 for (tp = __ipip6_bucket(sitn, parms);
234 (t = rtnl_dereference(*tp)) != NULL;
235 tp = &t->next) {
236 if (local == t->parms.iph.saddr &&
237 remote == t->parms.iph.daddr &&
238 parms->link == t->parms.link) {
239 if (create)
240 return NULL;
241 else
242 return t;
243 }
244 }
245 if (!create)
246 goto failed;
247
248 if (parms->name[0])
249 strlcpy(name, parms->name, IFNAMSIZ);
250 else
251 strcpy(name, "sit%d");
252
253 dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup);
254 if (dev == NULL)
255 return NULL;
256
257 dev_net_set(dev, net);
258
259 nt = netdev_priv(dev);
260
261 nt->parms = *parms;
262 if (ipip6_tunnel_create(dev) < 0)
263 goto failed_free;
264
265 return nt;
266
267 failed_free:
268 ipip6_dev_free(dev);
269 failed:
270 return NULL;
271 }
272
273 #define for_each_prl_rcu(start) \
274 for (prl = rcu_dereference(start); \
275 prl; \
276 prl = rcu_dereference(prl->next))
277
278 static struct ip_tunnel_prl_entry *
279 __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr)
280 {
281 struct ip_tunnel_prl_entry *prl;
282
283 for_each_prl_rcu(t->prl)
284 if (prl->addr == addr)
285 break;
286 return prl;
287
288 }
289
290 static int ipip6_tunnel_get_prl(struct ip_tunnel *t,
291 struct ip_tunnel_prl __user *a)
292 {
293 struct ip_tunnel_prl kprl, *kp;
294 struct ip_tunnel_prl_entry *prl;
295 unsigned int cmax, c = 0, ca, len;
296 int ret = 0;
297
298 if (copy_from_user(&kprl, a, sizeof(kprl)))
299 return -EFAULT;
300 cmax = kprl.datalen / sizeof(kprl);
301 if (cmax > 1 && kprl.addr != htonl(INADDR_ANY))
302 cmax = 1;
303
304 /* For simple GET or for root users,
305 * we try harder to allocate.
306 */
307 kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ?
308 kcalloc(cmax, sizeof(*kp), GFP_KERNEL) :
309 NULL;
310
311 rcu_read_lock();
312
313 ca = t->prl_count < cmax ? t->prl_count : cmax;
314
315 if (!kp) {
316 /* We don't try hard to allocate much memory for
317 * non-root users.
318 * For root users, retry allocating enough memory for
319 * the answer.
320 */
321 kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC);
322 if (!kp) {
323 ret = -ENOMEM;
324 goto out;
325 }
326 }
327
328 c = 0;
329 for_each_prl_rcu(t->prl) {
330 if (c >= cmax)
331 break;
332 if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr)
333 continue;
334 kp[c].addr = prl->addr;
335 kp[c].flags = prl->flags;
336 c++;
337 if (kprl.addr != htonl(INADDR_ANY))
338 break;
339 }
340 out:
341 rcu_read_unlock();
342
343 len = sizeof(*kp) * c;
344 ret = 0;
345 if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen))
346 ret = -EFAULT;
347
348 kfree(kp);
349
350 return ret;
351 }
352
353 static int
354 ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg)
355 {
356 struct ip_tunnel_prl_entry *p;
357 int err = 0;
358
359 if (a->addr == htonl(INADDR_ANY))
360 return -EINVAL;
361
362 ASSERT_RTNL();
363
364 for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) {
365 if (p->addr == a->addr) {
366 if (chg) {
367 p->flags = a->flags;
368 goto out;
369 }
370 err = -EEXIST;
371 goto out;
372 }
373 }
374
375 if (chg) {
376 err = -ENXIO;
377 goto out;
378 }
379
380 p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL);
381 if (!p) {
382 err = -ENOBUFS;
383 goto out;
384 }
385
386 p->next = t->prl;
387 p->addr = a->addr;
388 p->flags = a->flags;
389 t->prl_count++;
390 rcu_assign_pointer(t->prl, p);
391 out:
392 return err;
393 }
394
395 static void prl_list_destroy_rcu(struct rcu_head *head)
396 {
397 struct ip_tunnel_prl_entry *p, *n;
398
399 p = container_of(head, struct ip_tunnel_prl_entry, rcu_head);
400 do {
401 n = rcu_dereference_protected(p->next, 1);
402 kfree(p);
403 p = n;
404 } while (p);
405 }
406
407 static int
408 ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a)
409 {
410 struct ip_tunnel_prl_entry *x;
411 struct ip_tunnel_prl_entry __rcu **p;
412 int err = 0;
413
414 ASSERT_RTNL();
415
416 if (a && a->addr != htonl(INADDR_ANY)) {
417 for (p = &t->prl;
418 (x = rtnl_dereference(*p)) != NULL;
419 p = &x->next) {
420 if (x->addr == a->addr) {
421 *p = x->next;
422 kfree_rcu(x, rcu_head);
423 t->prl_count--;
424 goto out;
425 }
426 }
427 err = -ENXIO;
428 } else {
429 x = rtnl_dereference(t->prl);
430 if (x) {
431 t->prl_count = 0;
432 call_rcu(&x->rcu_head, prl_list_destroy_rcu);
433 t->prl = NULL;
434 }
435 }
436 out:
437 return err;
438 }
439
440 static int
441 isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t)
442 {
443 struct ip_tunnel_prl_entry *p;
444 int ok = 1;
445
446 rcu_read_lock();
447 p = __ipip6_tunnel_locate_prl(t, iph->saddr);
448 if (p) {
449 if (p->flags & PRL_DEFAULT)
450 skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT;
451 else
452 skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT;
453 } else {
454 const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr;
455
456 if (ipv6_addr_is_isatap(addr6) &&
457 (addr6->s6_addr32[3] == iph->saddr) &&
458 ipv6_chk_prefix(addr6, t->dev))
459 skb->ndisc_nodetype = NDISC_NODETYPE_HOST;
460 else
461 ok = 0;
462 }
463 rcu_read_unlock();
464 return ok;
465 }
466
467 static void ipip6_tunnel_uninit(struct net_device *dev)
468 {
469 struct ip_tunnel *tunnel = netdev_priv(dev);
470 struct sit_net *sitn = net_generic(tunnel->net, sit_net_id);
471
472 if (dev == sitn->fb_tunnel_dev) {
473 RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL);
474 } else {
475 ipip6_tunnel_unlink(sitn, tunnel);
476 ipip6_tunnel_del_prl(tunnel, NULL);
477 }
478 dev_put(dev);
479 }
480
481
482 static int ipip6_err(struct sk_buff *skb, u32 info)
483 {
484
485 /* All the routers (except for Linux) return only
486 8 bytes of packet payload. It means, that precise relaying of
487 ICMP in the real Internet is absolutely infeasible.
488 */
489 const struct iphdr *iph = (const struct iphdr *)skb->data;
490 const int type = icmp_hdr(skb)->type;
491 const int code = icmp_hdr(skb)->code;
492 struct ip_tunnel *t;
493 int err;
494
495 switch (type) {
496 default:
497 case ICMP_PARAMETERPROB:
498 return 0;
499
500 case ICMP_DEST_UNREACH:
501 switch (code) {
502 case ICMP_SR_FAILED:
503 case ICMP_PORT_UNREACH:
504 /* Impossible event. */
505 return 0;
506 default:
507 /* All others are translated to HOST_UNREACH.
508 rfc2003 contains "deep thoughts" about NET_UNREACH,
509 I believe they are just ether pollution. --ANK
510 */
511 break;
512 }
513 break;
514 case ICMP_TIME_EXCEEDED:
515 if (code != ICMP_EXC_TTL)
516 return 0;
517 break;
518 case ICMP_REDIRECT:
519 break;
520 }
521
522 err = -ENOENT;
523
524 t = ipip6_tunnel_lookup(dev_net(skb->dev),
525 skb->dev,
526 iph->daddr,
527 iph->saddr);
528 if (t == NULL)
529 goto out;
530
531 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
532 ipv4_update_pmtu(skb, dev_net(skb->dev), info,
533 t->dev->ifindex, 0, IPPROTO_IPV6, 0);
534 err = 0;
535 goto out;
536 }
537 if (type == ICMP_REDIRECT) {
538 ipv4_redirect(skb, dev_net(skb->dev), t->dev->ifindex, 0,
539 IPPROTO_IPV6, 0);
540 err = 0;
541 goto out;
542 }
543
544 if (t->parms.iph.daddr == 0)
545 goto out;
546
547 err = 0;
548 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
549 goto out;
550
551 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
552 t->err_count++;
553 else
554 t->err_count = 1;
555 t->err_time = jiffies;
556 out:
557 return err;
558 }
559
560 static inline bool is_spoofed_6rd(struct ip_tunnel *tunnel, const __be32 v4addr,
561 const struct in6_addr *v6addr)
562 {
563 __be32 v4embed = 0;
564 if (check_6rd(tunnel, v6addr, &v4embed) && v4addr != v4embed)
565 return true;
566 return false;
567 }
568
569 static int ipip6_rcv(struct sk_buff *skb)
570 {
571 const struct iphdr *iph = ip_hdr(skb);
572 struct ip_tunnel *tunnel;
573 int err;
574
575 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
576 iph->saddr, iph->daddr);
577 if (tunnel != NULL) {
578 struct pcpu_tstats *tstats;
579
580 if (tunnel->parms.iph.protocol != IPPROTO_IPV6 &&
581 tunnel->parms.iph.protocol != 0)
582 goto out;
583
584 secpath_reset(skb);
585 skb->mac_header = skb->network_header;
586 skb_reset_network_header(skb);
587 IPCB(skb)->flags = 0;
588 skb->protocol = htons(ETH_P_IPV6);
589 skb->pkt_type = PACKET_HOST;
590
591 if (tunnel->dev->priv_flags & IFF_ISATAP) {
592 if (!isatap_chksrc(skb, iph, tunnel)) {
593 tunnel->dev->stats.rx_errors++;
594 goto out;
595 }
596 } else if (!(tunnel->dev->flags&IFF_POINTOPOINT)) {
597 if (is_spoofed_6rd(tunnel, iph->saddr,
598 &ipv6_hdr(skb)->saddr) ||
599 is_spoofed_6rd(tunnel, iph->daddr,
600 &ipv6_hdr(skb)->daddr)) {
601 tunnel->dev->stats.rx_errors++;
602 goto out;
603 }
604 }
605
606 __skb_tunnel_rx(skb, tunnel->dev);
607
608 err = IP_ECN_decapsulate(iph, skb);
609 if (unlikely(err)) {
610 if (log_ecn_error)
611 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
612 &iph->saddr, iph->tos);
613 if (err > 1) {
614 ++tunnel->dev->stats.rx_frame_errors;
615 ++tunnel->dev->stats.rx_errors;
616 goto out;
617 }
618 }
619
620 tstats = this_cpu_ptr(tunnel->dev->tstats);
621 tstats->rx_packets++;
622 tstats->rx_bytes += skb->len;
623
624 if (tunnel->net != dev_net(tunnel->dev))
625 skb_scrub_packet(skb);
626 netif_rx(skb);
627
628 return 0;
629 }
630
631 /* no tunnel matched, let upstream know, ipsec may handle it */
632 return 1;
633 out:
634 kfree_skb(skb);
635 return 0;
636 }
637
638 static const struct tnl_ptk_info tpi = {
639 /* no tunnel info required for ipip. */
640 .proto = htons(ETH_P_IP),
641 };
642
643 static int ipip_rcv(struct sk_buff *skb)
644 {
645 const struct iphdr *iph;
646 struct ip_tunnel *tunnel;
647
648 iph = ip_hdr(skb);
649 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
650 iph->saddr, iph->daddr);
651 if (tunnel != NULL) {
652 if (tunnel->parms.iph.protocol != IPPROTO_IPIP &&
653 tunnel->parms.iph.protocol != 0)
654 goto drop;
655
656 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
657 goto drop;
658 if (iptunnel_pull_header(skb, 0, tpi.proto))
659 goto drop;
660 return ip_tunnel_rcv(tunnel, skb, &tpi, log_ecn_error);
661 }
662
663 return 1;
664
665 drop:
666 kfree_skb(skb);
667 return 0;
668 }
669
670 /*
671 * If the IPv6 address comes from 6rd / 6to4 (RFC 3056) addr space this function
672 * stores the embedded IPv4 address in v4dst and returns true.
673 */
674 static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst,
675 __be32 *v4dst)
676 {
677 #ifdef CONFIG_IPV6_SIT_6RD
678 if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix,
679 tunnel->ip6rd.prefixlen)) {
680 unsigned int pbw0, pbi0;
681 int pbi1;
682 u32 d;
683
684 pbw0 = tunnel->ip6rd.prefixlen >> 5;
685 pbi0 = tunnel->ip6rd.prefixlen & 0x1f;
686
687 d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >>
688 tunnel->ip6rd.relay_prefixlen;
689
690 pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen;
691 if (pbi1 > 0)
692 d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >>
693 (32 - pbi1);
694
695 *v4dst = tunnel->ip6rd.relay_prefix | htonl(d);
696 return true;
697 }
698 #else
699 if (v6dst->s6_addr16[0] == htons(0x2002)) {
700 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */
701 memcpy(v4dst, &v6dst->s6_addr16[1], 4);
702 return true;
703 }
704 #endif
705 return false;
706 }
707
708 static inline __be32 try_6rd(struct ip_tunnel *tunnel,
709 const struct in6_addr *v6dst)
710 {
711 __be32 dst = 0;
712 check_6rd(tunnel, v6dst, &dst);
713 return dst;
714 }
715
716 /*
717 * This function assumes it is being called from dev_queue_xmit()
718 * and that skb is filled properly by that function.
719 */
720
721 static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb,
722 struct net_device *dev)
723 {
724 struct ip_tunnel *tunnel = netdev_priv(dev);
725 const struct iphdr *tiph = &tunnel->parms.iph;
726 const struct ipv6hdr *iph6 = ipv6_hdr(skb);
727 u8 tos = tunnel->parms.iph.tos;
728 __be16 df = tiph->frag_off;
729 struct rtable *rt; /* Route to the other host */
730 struct net_device *tdev; /* Device to other host */
731 unsigned int max_headroom; /* The extra header space needed */
732 __be32 dst = tiph->daddr;
733 struct flowi4 fl4;
734 int mtu;
735 const struct in6_addr *addr6;
736 int addr_type;
737 u8 ttl;
738 int err;
739
740 if (skb->protocol != htons(ETH_P_IPV6))
741 goto tx_error;
742
743 if (tos == 1)
744 tos = ipv6_get_dsfield(iph6);
745
746 /* ISATAP (RFC4214) - must come before 6to4 */
747 if (dev->priv_flags & IFF_ISATAP) {
748 struct neighbour *neigh = NULL;
749 bool do_tx_error = false;
750
751 if (skb_dst(skb))
752 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr);
753
754 if (neigh == NULL) {
755 net_dbg_ratelimited("sit: nexthop == NULL\n");
756 goto tx_error;
757 }
758
759 addr6 = (const struct in6_addr *)&neigh->primary_key;
760 addr_type = ipv6_addr_type(addr6);
761
762 if ((addr_type & IPV6_ADDR_UNICAST) &&
763 ipv6_addr_is_isatap(addr6))
764 dst = addr6->s6_addr32[3];
765 else
766 do_tx_error = true;
767
768 neigh_release(neigh);
769 if (do_tx_error)
770 goto tx_error;
771 }
772
773 if (!dst)
774 dst = try_6rd(tunnel, &iph6->daddr);
775
776 if (!dst) {
777 struct neighbour *neigh = NULL;
778 bool do_tx_error = false;
779
780 if (skb_dst(skb))
781 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr);
782
783 if (neigh == NULL) {
784 net_dbg_ratelimited("sit: nexthop == NULL\n");
785 goto tx_error;
786 }
787
788 addr6 = (const struct in6_addr *)&neigh->primary_key;
789 addr_type = ipv6_addr_type(addr6);
790
791 if (addr_type == IPV6_ADDR_ANY) {
792 addr6 = &ipv6_hdr(skb)->daddr;
793 addr_type = ipv6_addr_type(addr6);
794 }
795
796 if ((addr_type & IPV6_ADDR_COMPATv4) != 0)
797 dst = addr6->s6_addr32[3];
798 else
799 do_tx_error = true;
800
801 neigh_release(neigh);
802 if (do_tx_error)
803 goto tx_error;
804 }
805
806 rt = ip_route_output_ports(tunnel->net, &fl4, NULL,
807 dst, tiph->saddr,
808 0, 0,
809 IPPROTO_IPV6, RT_TOS(tos),
810 tunnel->parms.link);
811 if (IS_ERR(rt)) {
812 dev->stats.tx_carrier_errors++;
813 goto tx_error_icmp;
814 }
815 if (rt->rt_type != RTN_UNICAST) {
816 ip_rt_put(rt);
817 dev->stats.tx_carrier_errors++;
818 goto tx_error_icmp;
819 }
820 tdev = rt->dst.dev;
821
822 if (tdev == dev) {
823 ip_rt_put(rt);
824 dev->stats.collisions++;
825 goto tx_error;
826 }
827
828 if (df) {
829 mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr);
830
831 if (mtu < 68) {
832 dev->stats.collisions++;
833 ip_rt_put(rt);
834 goto tx_error;
835 }
836
837 if (mtu < IPV6_MIN_MTU) {
838 mtu = IPV6_MIN_MTU;
839 df = 0;
840 }
841
842 if (tunnel->parms.iph.daddr && skb_dst(skb))
843 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
844
845 if (skb->len > mtu) {
846 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
847 ip_rt_put(rt);
848 goto tx_error;
849 }
850 }
851
852 if (tunnel->err_count > 0) {
853 if (time_before(jiffies,
854 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
855 tunnel->err_count--;
856 dst_link_failure(skb);
857 } else
858 tunnel->err_count = 0;
859 }
860
861 if (tunnel->net != dev_net(dev))
862 skb_scrub_packet(skb);
863
864 /*
865 * Okay, now see if we can stuff it in the buffer as-is.
866 */
867 max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr);
868
869 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
870 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
871 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
872 if (!new_skb) {
873 ip_rt_put(rt);
874 dev->stats.tx_dropped++;
875 dev_kfree_skb(skb);
876 return NETDEV_TX_OK;
877 }
878 if (skb->sk)
879 skb_set_owner_w(new_skb, skb->sk);
880 dev_kfree_skb(skb);
881 skb = new_skb;
882 iph6 = ipv6_hdr(skb);
883 }
884 ttl = tiph->ttl;
885 if (ttl == 0)
886 ttl = iph6->hop_limit;
887 tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6));
888
889 if (likely(!skb->encapsulation)) {
890 skb_reset_inner_headers(skb);
891 skb->encapsulation = 1;
892 }
893
894 err = iptunnel_xmit(dev_net(dev), rt, skb, fl4.saddr, fl4.daddr,
895 IPPROTO_IPV6, tos, ttl, df);
896 iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
897 return NETDEV_TX_OK;
898
899 tx_error_icmp:
900 dst_link_failure(skb);
901 tx_error:
902 dev->stats.tx_errors++;
903 dev_kfree_skb(skb);
904 return NETDEV_TX_OK;
905 }
906
907 static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
908 {
909 struct ip_tunnel *tunnel = netdev_priv(dev);
910 const struct iphdr *tiph = &tunnel->parms.iph;
911
912 if (likely(!skb->encapsulation)) {
913 skb_reset_inner_headers(skb);
914 skb->encapsulation = 1;
915 }
916
917 ip_tunnel_xmit(skb, dev, tiph, IPPROTO_IPIP);
918 return NETDEV_TX_OK;
919 }
920
921 static netdev_tx_t sit_tunnel_xmit(struct sk_buff *skb,
922 struct net_device *dev)
923 {
924 switch (skb->protocol) {
925 case htons(ETH_P_IP):
926 ipip_tunnel_xmit(skb, dev);
927 break;
928 case htons(ETH_P_IPV6):
929 ipip6_tunnel_xmit(skb, dev);
930 break;
931 default:
932 goto tx_err;
933 }
934
935 return NETDEV_TX_OK;
936
937 tx_err:
938 dev->stats.tx_errors++;
939 dev_kfree_skb(skb);
940 return NETDEV_TX_OK;
941
942 }
943
944 static void ipip6_tunnel_bind_dev(struct net_device *dev)
945 {
946 struct net_device *tdev = NULL;
947 struct ip_tunnel *tunnel;
948 const struct iphdr *iph;
949 struct flowi4 fl4;
950
951 tunnel = netdev_priv(dev);
952 iph = &tunnel->parms.iph;
953
954 if (iph->daddr) {
955 struct rtable *rt = ip_route_output_ports(tunnel->net, &fl4,
956 NULL,
957 iph->daddr, iph->saddr,
958 0, 0,
959 IPPROTO_IPV6,
960 RT_TOS(iph->tos),
961 tunnel->parms.link);
962
963 if (!IS_ERR(rt)) {
964 tdev = rt->dst.dev;
965 ip_rt_put(rt);
966 }
967 dev->flags |= IFF_POINTOPOINT;
968 }
969
970 if (!tdev && tunnel->parms.link)
971 tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link);
972
973 if (tdev) {
974 dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr);
975 dev->mtu = tdev->mtu - sizeof(struct iphdr);
976 if (dev->mtu < IPV6_MIN_MTU)
977 dev->mtu = IPV6_MIN_MTU;
978 }
979 dev->iflink = tunnel->parms.link;
980 }
981
982 static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p)
983 {
984 struct net *net = t->net;
985 struct sit_net *sitn = net_generic(net, sit_net_id);
986
987 ipip6_tunnel_unlink(sitn, t);
988 synchronize_net();
989 t->parms.iph.saddr = p->iph.saddr;
990 t->parms.iph.daddr = p->iph.daddr;
991 memcpy(t->dev->dev_addr, &p->iph.saddr, 4);
992 memcpy(t->dev->broadcast, &p->iph.daddr, 4);
993 ipip6_tunnel_link(sitn, t);
994 t->parms.iph.ttl = p->iph.ttl;
995 t->parms.iph.tos = p->iph.tos;
996 if (t->parms.link != p->link) {
997 t->parms.link = p->link;
998 ipip6_tunnel_bind_dev(t->dev);
999 }
1000 netdev_state_change(t->dev);
1001 }
1002
1003 #ifdef CONFIG_IPV6_SIT_6RD
1004 static int ipip6_tunnel_update_6rd(struct ip_tunnel *t,
1005 struct ip_tunnel_6rd *ip6rd)
1006 {
1007 struct in6_addr prefix;
1008 __be32 relay_prefix;
1009
1010 if (ip6rd->relay_prefixlen > 32 ||
1011 ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64)
1012 return -EINVAL;
1013
1014 ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen);
1015 if (!ipv6_addr_equal(&prefix, &ip6rd->prefix))
1016 return -EINVAL;
1017 if (ip6rd->relay_prefixlen)
1018 relay_prefix = ip6rd->relay_prefix &
1019 htonl(0xffffffffUL <<
1020 (32 - ip6rd->relay_prefixlen));
1021 else
1022 relay_prefix = 0;
1023 if (relay_prefix != ip6rd->relay_prefix)
1024 return -EINVAL;
1025
1026 t->ip6rd.prefix = prefix;
1027 t->ip6rd.relay_prefix = relay_prefix;
1028 t->ip6rd.prefixlen = ip6rd->prefixlen;
1029 t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen;
1030 netdev_state_change(t->dev);
1031 return 0;
1032 }
1033 #endif
1034
1035 static int
1036 ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
1037 {
1038 int err = 0;
1039 struct ip_tunnel_parm p;
1040 struct ip_tunnel_prl prl;
1041 struct ip_tunnel *t;
1042 struct net *net = dev_net(dev);
1043 struct sit_net *sitn = net_generic(net, sit_net_id);
1044 #ifdef CONFIG_IPV6_SIT_6RD
1045 struct ip_tunnel_6rd ip6rd;
1046 #endif
1047
1048 switch (cmd) {
1049 case SIOCGETTUNNEL:
1050 #ifdef CONFIG_IPV6_SIT_6RD
1051 case SIOCGET6RD:
1052 #endif
1053 t = NULL;
1054 if (dev == sitn->fb_tunnel_dev) {
1055 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1056 err = -EFAULT;
1057 break;
1058 }
1059 t = ipip6_tunnel_locate(net, &p, 0);
1060 }
1061 if (t == NULL)
1062 t = netdev_priv(dev);
1063
1064 err = -EFAULT;
1065 if (cmd == SIOCGETTUNNEL) {
1066 memcpy(&p, &t->parms, sizeof(p));
1067 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p,
1068 sizeof(p)))
1069 goto done;
1070 #ifdef CONFIG_IPV6_SIT_6RD
1071 } else {
1072 ip6rd.prefix = t->ip6rd.prefix;
1073 ip6rd.relay_prefix = t->ip6rd.relay_prefix;
1074 ip6rd.prefixlen = t->ip6rd.prefixlen;
1075 ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen;
1076 if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd,
1077 sizeof(ip6rd)))
1078 goto done;
1079 #endif
1080 }
1081 err = 0;
1082 break;
1083
1084 case SIOCADDTUNNEL:
1085 case SIOCCHGTUNNEL:
1086 err = -EPERM;
1087 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1088 goto done;
1089
1090 err = -EFAULT;
1091 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1092 goto done;
1093
1094 err = -EINVAL;
1095 if (p.iph.protocol != IPPROTO_IPV6 &&
1096 p.iph.protocol != IPPROTO_IPIP &&
1097 p.iph.protocol != 0)
1098 goto done;
1099 if (p.iph.version != 4 ||
1100 p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
1101 goto done;
1102 if (p.iph.ttl)
1103 p.iph.frag_off |= htons(IP_DF);
1104
1105 t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL);
1106
1107 if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1108 if (t != NULL) {
1109 if (t->dev != dev) {
1110 err = -EEXIST;
1111 break;
1112 }
1113 } else {
1114 if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) ||
1115 (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) {
1116 err = -EINVAL;
1117 break;
1118 }
1119 t = netdev_priv(dev);
1120 }
1121
1122 ipip6_tunnel_update(t, &p);
1123 }
1124
1125 if (t) {
1126 err = 0;
1127 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
1128 err = -EFAULT;
1129 } else
1130 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1131 break;
1132
1133 case SIOCDELTUNNEL:
1134 err = -EPERM;
1135 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1136 goto done;
1137
1138 if (dev == sitn->fb_tunnel_dev) {
1139 err = -EFAULT;
1140 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1141 goto done;
1142 err = -ENOENT;
1143 if ((t = ipip6_tunnel_locate(net, &p, 0)) == NULL)
1144 goto done;
1145 err = -EPERM;
1146 if (t == netdev_priv(sitn->fb_tunnel_dev))
1147 goto done;
1148 dev = t->dev;
1149 }
1150 unregister_netdevice(dev);
1151 err = 0;
1152 break;
1153
1154 case SIOCGETPRL:
1155 err = -EINVAL;
1156 if (dev == sitn->fb_tunnel_dev)
1157 goto done;
1158 err = -ENOENT;
1159 if (!(t = netdev_priv(dev)))
1160 goto done;
1161 err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data);
1162 break;
1163
1164 case SIOCADDPRL:
1165 case SIOCDELPRL:
1166 case SIOCCHGPRL:
1167 err = -EPERM;
1168 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1169 goto done;
1170 err = -EINVAL;
1171 if (dev == sitn->fb_tunnel_dev)
1172 goto done;
1173 err = -EFAULT;
1174 if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl)))
1175 goto done;
1176 err = -ENOENT;
1177 if (!(t = netdev_priv(dev)))
1178 goto done;
1179
1180 switch (cmd) {
1181 case SIOCDELPRL:
1182 err = ipip6_tunnel_del_prl(t, &prl);
1183 break;
1184 case SIOCADDPRL:
1185 case SIOCCHGPRL:
1186 err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL);
1187 break;
1188 }
1189 netdev_state_change(dev);
1190 break;
1191
1192 #ifdef CONFIG_IPV6_SIT_6RD
1193 case SIOCADD6RD:
1194 case SIOCCHG6RD:
1195 case SIOCDEL6RD:
1196 err = -EPERM;
1197 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1198 goto done;
1199
1200 err = -EFAULT;
1201 if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data,
1202 sizeof(ip6rd)))
1203 goto done;
1204
1205 t = netdev_priv(dev);
1206
1207 if (cmd != SIOCDEL6RD) {
1208 err = ipip6_tunnel_update_6rd(t, &ip6rd);
1209 if (err < 0)
1210 goto done;
1211 } else
1212 ipip6_tunnel_clone_6rd(dev, sitn);
1213
1214 err = 0;
1215 break;
1216 #endif
1217
1218 default:
1219 err = -EINVAL;
1220 }
1221
1222 done:
1223 return err;
1224 }
1225
1226 static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu)
1227 {
1228 if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr))
1229 return -EINVAL;
1230 dev->mtu = new_mtu;
1231 return 0;
1232 }
1233
1234 static const struct net_device_ops ipip6_netdev_ops = {
1235 .ndo_uninit = ipip6_tunnel_uninit,
1236 .ndo_start_xmit = sit_tunnel_xmit,
1237 .ndo_do_ioctl = ipip6_tunnel_ioctl,
1238 .ndo_change_mtu = ipip6_tunnel_change_mtu,
1239 .ndo_get_stats64 = ip_tunnel_get_stats64,
1240 };
1241
1242 static void ipip6_dev_free(struct net_device *dev)
1243 {
1244 free_percpu(dev->tstats);
1245 free_netdev(dev);
1246 }
1247
1248 static void ipip6_tunnel_setup(struct net_device *dev)
1249 {
1250 dev->netdev_ops = &ipip6_netdev_ops;
1251 dev->destructor = ipip6_dev_free;
1252
1253 dev->type = ARPHRD_SIT;
1254 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr);
1255 dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr);
1256 dev->flags = IFF_NOARP;
1257 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1258 dev->iflink = 0;
1259 dev->addr_len = 4;
1260 dev->features |= NETIF_F_LLTX;
1261 }
1262
1263 static int ipip6_tunnel_init(struct net_device *dev)
1264 {
1265 struct ip_tunnel *tunnel = netdev_priv(dev);
1266
1267 tunnel->dev = dev;
1268 tunnel->net = dev_net(dev);
1269
1270 memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
1271 memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
1272
1273 ipip6_tunnel_bind_dev(dev);
1274 dev->tstats = alloc_percpu(struct pcpu_tstats);
1275 if (!dev->tstats)
1276 return -ENOMEM;
1277
1278 return 0;
1279 }
1280
1281 static int __net_init ipip6_fb_tunnel_init(struct net_device *dev)
1282 {
1283 struct ip_tunnel *tunnel = netdev_priv(dev);
1284 struct iphdr *iph = &tunnel->parms.iph;
1285 struct net *net = dev_net(dev);
1286 struct sit_net *sitn = net_generic(net, sit_net_id);
1287
1288 tunnel->dev = dev;
1289 tunnel->net = dev_net(dev);
1290 strcpy(tunnel->parms.name, dev->name);
1291
1292 iph->version = 4;
1293 iph->protocol = IPPROTO_IPV6;
1294 iph->ihl = 5;
1295 iph->ttl = 64;
1296
1297 dev->tstats = alloc_percpu(struct pcpu_tstats);
1298 if (!dev->tstats)
1299 return -ENOMEM;
1300 dev_hold(dev);
1301 rcu_assign_pointer(sitn->tunnels_wc[0], tunnel);
1302 return 0;
1303 }
1304
1305 static int ipip6_validate(struct nlattr *tb[], struct nlattr *data[])
1306 {
1307 u8 proto;
1308
1309 if (!data || !data[IFLA_IPTUN_PROTO])
1310 return 0;
1311
1312 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1313 if (proto != IPPROTO_IPV6 &&
1314 proto != IPPROTO_IPIP &&
1315 proto != 0)
1316 return -EINVAL;
1317
1318 return 0;
1319 }
1320
1321 static void ipip6_netlink_parms(struct nlattr *data[],
1322 struct ip_tunnel_parm *parms)
1323 {
1324 memset(parms, 0, sizeof(*parms));
1325
1326 parms->iph.version = 4;
1327 parms->iph.protocol = IPPROTO_IPV6;
1328 parms->iph.ihl = 5;
1329 parms->iph.ttl = 64;
1330
1331 if (!data)
1332 return;
1333
1334 if (data[IFLA_IPTUN_LINK])
1335 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1336
1337 if (data[IFLA_IPTUN_LOCAL])
1338 parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]);
1339
1340 if (data[IFLA_IPTUN_REMOTE])
1341 parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]);
1342
1343 if (data[IFLA_IPTUN_TTL]) {
1344 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]);
1345 if (parms->iph.ttl)
1346 parms->iph.frag_off = htons(IP_DF);
1347 }
1348
1349 if (data[IFLA_IPTUN_TOS])
1350 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]);
1351
1352 if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC]))
1353 parms->iph.frag_off = htons(IP_DF);
1354
1355 if (data[IFLA_IPTUN_FLAGS])
1356 parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]);
1357
1358 if (data[IFLA_IPTUN_PROTO])
1359 parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1360
1361 }
1362
1363 #ifdef CONFIG_IPV6_SIT_6RD
1364 /* This function returns true when 6RD attributes are present in the nl msg */
1365 static bool ipip6_netlink_6rd_parms(struct nlattr *data[],
1366 struct ip_tunnel_6rd *ip6rd)
1367 {
1368 bool ret = false;
1369 memset(ip6rd, 0, sizeof(*ip6rd));
1370
1371 if (!data)
1372 return ret;
1373
1374 if (data[IFLA_IPTUN_6RD_PREFIX]) {
1375 ret = true;
1376 nla_memcpy(&ip6rd->prefix, data[IFLA_IPTUN_6RD_PREFIX],
1377 sizeof(struct in6_addr));
1378 }
1379
1380 if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) {
1381 ret = true;
1382 ip6rd->relay_prefix =
1383 nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]);
1384 }
1385
1386 if (data[IFLA_IPTUN_6RD_PREFIXLEN]) {
1387 ret = true;
1388 ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]);
1389 }
1390
1391 if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) {
1392 ret = true;
1393 ip6rd->relay_prefixlen =
1394 nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]);
1395 }
1396
1397 return ret;
1398 }
1399 #endif
1400
1401 static int ipip6_newlink(struct net *src_net, struct net_device *dev,
1402 struct nlattr *tb[], struct nlattr *data[])
1403 {
1404 struct net *net = dev_net(dev);
1405 struct ip_tunnel *nt;
1406 #ifdef CONFIG_IPV6_SIT_6RD
1407 struct ip_tunnel_6rd ip6rd;
1408 #endif
1409 int err;
1410
1411 nt = netdev_priv(dev);
1412 ipip6_netlink_parms(data, &nt->parms);
1413
1414 if (ipip6_tunnel_locate(net, &nt->parms, 0))
1415 return -EEXIST;
1416
1417 err = ipip6_tunnel_create(dev);
1418 if (err < 0)
1419 return err;
1420
1421 #ifdef CONFIG_IPV6_SIT_6RD
1422 if (ipip6_netlink_6rd_parms(data, &ip6rd))
1423 err = ipip6_tunnel_update_6rd(nt, &ip6rd);
1424 #endif
1425
1426 return err;
1427 }
1428
1429 static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[],
1430 struct nlattr *data[])
1431 {
1432 struct ip_tunnel *t = netdev_priv(dev);
1433 struct ip_tunnel_parm p;
1434 struct net *net = t->net;
1435 struct sit_net *sitn = net_generic(net, sit_net_id);
1436 #ifdef CONFIG_IPV6_SIT_6RD
1437 struct ip_tunnel_6rd ip6rd;
1438 #endif
1439
1440 if (dev == sitn->fb_tunnel_dev)
1441 return -EINVAL;
1442
1443 ipip6_netlink_parms(data, &p);
1444
1445 if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) ||
1446 (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr))
1447 return -EINVAL;
1448
1449 t = ipip6_tunnel_locate(net, &p, 0);
1450
1451 if (t) {
1452 if (t->dev != dev)
1453 return -EEXIST;
1454 } else
1455 t = netdev_priv(dev);
1456
1457 ipip6_tunnel_update(t, &p);
1458
1459 #ifdef CONFIG_IPV6_SIT_6RD
1460 if (ipip6_netlink_6rd_parms(data, &ip6rd))
1461 return ipip6_tunnel_update_6rd(t, &ip6rd);
1462 #endif
1463
1464 return 0;
1465 }
1466
1467 static size_t ipip6_get_size(const struct net_device *dev)
1468 {
1469 return
1470 /* IFLA_IPTUN_LINK */
1471 nla_total_size(4) +
1472 /* IFLA_IPTUN_LOCAL */
1473 nla_total_size(4) +
1474 /* IFLA_IPTUN_REMOTE */
1475 nla_total_size(4) +
1476 /* IFLA_IPTUN_TTL */
1477 nla_total_size(1) +
1478 /* IFLA_IPTUN_TOS */
1479 nla_total_size(1) +
1480 /* IFLA_IPTUN_PMTUDISC */
1481 nla_total_size(1) +
1482 /* IFLA_IPTUN_FLAGS */
1483 nla_total_size(2) +
1484 /* IFLA_IPTUN_PROTO */
1485 nla_total_size(1) +
1486 #ifdef CONFIG_IPV6_SIT_6RD
1487 /* IFLA_IPTUN_6RD_PREFIX */
1488 nla_total_size(sizeof(struct in6_addr)) +
1489 /* IFLA_IPTUN_6RD_RELAY_PREFIX */
1490 nla_total_size(4) +
1491 /* IFLA_IPTUN_6RD_PREFIXLEN */
1492 nla_total_size(2) +
1493 /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */
1494 nla_total_size(2) +
1495 #endif
1496 0;
1497 }
1498
1499 static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev)
1500 {
1501 struct ip_tunnel *tunnel = netdev_priv(dev);
1502 struct ip_tunnel_parm *parm = &tunnel->parms;
1503
1504 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
1505 nla_put_be32(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) ||
1506 nla_put_be32(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) ||
1507 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) ||
1508 nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) ||
1509 nla_put_u8(skb, IFLA_IPTUN_PMTUDISC,
1510 !!(parm->iph.frag_off & htons(IP_DF))) ||
1511 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) ||
1512 nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags))
1513 goto nla_put_failure;
1514
1515 #ifdef CONFIG_IPV6_SIT_6RD
1516 if (nla_put(skb, IFLA_IPTUN_6RD_PREFIX, sizeof(struct in6_addr),
1517 &tunnel->ip6rd.prefix) ||
1518 nla_put_be32(skb, IFLA_IPTUN_6RD_RELAY_PREFIX,
1519 tunnel->ip6rd.relay_prefix) ||
1520 nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN,
1521 tunnel->ip6rd.prefixlen) ||
1522 nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN,
1523 tunnel->ip6rd.relay_prefixlen))
1524 goto nla_put_failure;
1525 #endif
1526
1527 return 0;
1528
1529 nla_put_failure:
1530 return -EMSGSIZE;
1531 }
1532
1533 static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = {
1534 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
1535 [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 },
1536 [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 },
1537 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
1538 [IFLA_IPTUN_TOS] = { .type = NLA_U8 },
1539 [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 },
1540 [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 },
1541 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
1542 #ifdef CONFIG_IPV6_SIT_6RD
1543 [IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) },
1544 [IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 },
1545 [IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 },
1546 [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 },
1547 #endif
1548 };
1549
1550 static struct rtnl_link_ops sit_link_ops __read_mostly = {
1551 .kind = "sit",
1552 .maxtype = IFLA_IPTUN_MAX,
1553 .policy = ipip6_policy,
1554 .priv_size = sizeof(struct ip_tunnel),
1555 .setup = ipip6_tunnel_setup,
1556 .validate = ipip6_validate,
1557 .newlink = ipip6_newlink,
1558 .changelink = ipip6_changelink,
1559 .get_size = ipip6_get_size,
1560 .fill_info = ipip6_fill_info,
1561 };
1562
1563 static struct xfrm_tunnel sit_handler __read_mostly = {
1564 .handler = ipip6_rcv,
1565 .err_handler = ipip6_err,
1566 .priority = 1,
1567 };
1568
1569 static struct xfrm_tunnel ipip_handler __read_mostly = {
1570 .handler = ipip_rcv,
1571 .err_handler = ipip6_err,
1572 .priority = 2,
1573 };
1574
1575 static void __net_exit sit_destroy_tunnels(struct sit_net *sitn, struct list_head *head)
1576 {
1577 struct net *net = dev_net(sitn->fb_tunnel_dev);
1578 struct net_device *dev, *aux;
1579 int prio;
1580
1581 for_each_netdev_safe(net, dev, aux)
1582 if (dev->rtnl_link_ops == &sit_link_ops)
1583 unregister_netdevice_queue(dev, head);
1584
1585 for (prio = 1; prio < 4; prio++) {
1586 int h;
1587 for (h = 0; h < HASH_SIZE; h++) {
1588 struct ip_tunnel *t;
1589
1590 t = rtnl_dereference(sitn->tunnels[prio][h]);
1591 while (t != NULL) {
1592 /* If dev is in the same netns, it has already
1593 * been added to the list by the previous loop.
1594 */
1595 if (dev_net(t->dev) != net)
1596 unregister_netdevice_queue(t->dev,
1597 head);
1598 t = rtnl_dereference(t->next);
1599 }
1600 }
1601 }
1602 }
1603
1604 static int __net_init sit_init_net(struct net *net)
1605 {
1606 struct sit_net *sitn = net_generic(net, sit_net_id);
1607 struct ip_tunnel *t;
1608 int err;
1609
1610 sitn->tunnels[0] = sitn->tunnels_wc;
1611 sitn->tunnels[1] = sitn->tunnels_l;
1612 sitn->tunnels[2] = sitn->tunnels_r;
1613 sitn->tunnels[3] = sitn->tunnels_r_l;
1614
1615 sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0",
1616 ipip6_tunnel_setup);
1617 if (!sitn->fb_tunnel_dev) {
1618 err = -ENOMEM;
1619 goto err_alloc_dev;
1620 }
1621 dev_net_set(sitn->fb_tunnel_dev, net);
1622 /* FB netdevice is special: we have one, and only one per netns.
1623 * Allowing to move it to another netns is clearly unsafe.
1624 */
1625 sitn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1626
1627 err = ipip6_fb_tunnel_init(sitn->fb_tunnel_dev);
1628 if (err)
1629 goto err_dev_free;
1630
1631 ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn);
1632
1633 if ((err = register_netdev(sitn->fb_tunnel_dev)))
1634 goto err_reg_dev;
1635
1636 t = netdev_priv(sitn->fb_tunnel_dev);
1637
1638 strcpy(t->parms.name, sitn->fb_tunnel_dev->name);
1639 return 0;
1640
1641 err_reg_dev:
1642 dev_put(sitn->fb_tunnel_dev);
1643 err_dev_free:
1644 ipip6_dev_free(sitn->fb_tunnel_dev);
1645 err_alloc_dev:
1646 return err;
1647 }
1648
1649 static void __net_exit sit_exit_net(struct net *net)
1650 {
1651 struct sit_net *sitn = net_generic(net, sit_net_id);
1652 LIST_HEAD(list);
1653
1654 rtnl_lock();
1655 sit_destroy_tunnels(sitn, &list);
1656 unregister_netdevice_queue(sitn->fb_tunnel_dev, &list);
1657 unregister_netdevice_many(&list);
1658 rtnl_unlock();
1659 }
1660
1661 static struct pernet_operations sit_net_ops = {
1662 .init = sit_init_net,
1663 .exit = sit_exit_net,
1664 .id = &sit_net_id,
1665 .size = sizeof(struct sit_net),
1666 };
1667
1668 static void __exit sit_cleanup(void)
1669 {
1670 rtnl_link_unregister(&sit_link_ops);
1671 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
1672 xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
1673
1674 unregister_pernet_device(&sit_net_ops);
1675 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1676 }
1677
1678 static int __init sit_init(void)
1679 {
1680 int err;
1681
1682 pr_info("IPv6 over IPv4 tunneling driver\n");
1683
1684 err = register_pernet_device(&sit_net_ops);
1685 if (err < 0)
1686 return err;
1687 err = xfrm4_tunnel_register(&sit_handler, AF_INET6);
1688 if (err < 0) {
1689 pr_info("%s: can't register ip6ip4\n", __func__);
1690 goto xfrm_tunnel_failed;
1691 }
1692 err = xfrm4_tunnel_register(&ipip_handler, AF_INET);
1693 if (err < 0) {
1694 pr_info("%s: can't register ip4ip4\n", __func__);
1695 goto xfrm_tunnel4_failed;
1696 }
1697 err = rtnl_link_register(&sit_link_ops);
1698 if (err < 0)
1699 goto rtnl_link_failed;
1700
1701 out:
1702 return err;
1703
1704 rtnl_link_failed:
1705 xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
1706 xfrm_tunnel4_failed:
1707 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
1708 xfrm_tunnel_failed:
1709 unregister_pernet_device(&sit_net_ops);
1710 goto out;
1711 }
1712
1713 module_init(sit_init);
1714 module_exit(sit_cleanup);
1715 MODULE_LICENSE("GPL");
1716 MODULE_ALIAS_NETDEV("sit0");
Ubuntu Artful kernel mirror