]> 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
Tunneling: use IP Tunnel stats APIs.
[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 net *net = dev_net(dev);
470 struct sit_net *sitn = net_generic(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, netdev_priv(dev));
476 ipip6_tunnel_del_prl(netdev_priv(dev), 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 secpath_reset(skb);
581 skb->mac_header = skb->network_header;
582 skb_reset_network_header(skb);
583 IPCB(skb)->flags = 0;
584 skb->protocol = htons(ETH_P_IPV6);
585 skb->pkt_type = PACKET_HOST;
586
587 if (tunnel->dev->priv_flags & IFF_ISATAP) {
588 if (!isatap_chksrc(skb, iph, tunnel)) {
589 tunnel->dev->stats.rx_errors++;
590 goto out;
591 }
592 } else {
593 if (is_spoofed_6rd(tunnel, iph->saddr,
594 &ipv6_hdr(skb)->saddr) ||
595 is_spoofed_6rd(tunnel, iph->daddr,
596 &ipv6_hdr(skb)->daddr)) {
597 tunnel->dev->stats.rx_errors++;
598 goto out;
599 }
600 }
601
602 __skb_tunnel_rx(skb, tunnel->dev);
603
604 err = IP_ECN_decapsulate(iph, skb);
605 if (unlikely(err)) {
606 if (log_ecn_error)
607 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
608 &iph->saddr, iph->tos);
609 if (err > 1) {
610 ++tunnel->dev->stats.rx_frame_errors;
611 ++tunnel->dev->stats.rx_errors;
612 goto out;
613 }
614 }
615
616 tstats = this_cpu_ptr(tunnel->dev->tstats);
617 tstats->rx_packets++;
618 tstats->rx_bytes += skb->len;
619
620 netif_rx(skb);
621
622 return 0;
623 }
624
625 /* no tunnel matched, let upstream know, ipsec may handle it */
626 return 1;
627 out:
628 kfree_skb(skb);
629 return 0;
630 }
631
632 /*
633 * If the IPv6 address comes from 6rd / 6to4 (RFC 3056) addr space this function
634 * stores the embedded IPv4 address in v4dst and returns true.
635 */
636 static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst,
637 __be32 *v4dst)
638 {
639 #ifdef CONFIG_IPV6_SIT_6RD
640 if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix,
641 tunnel->ip6rd.prefixlen)) {
642 unsigned int pbw0, pbi0;
643 int pbi1;
644 u32 d;
645
646 pbw0 = tunnel->ip6rd.prefixlen >> 5;
647 pbi0 = tunnel->ip6rd.prefixlen & 0x1f;
648
649 d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >>
650 tunnel->ip6rd.relay_prefixlen;
651
652 pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen;
653 if (pbi1 > 0)
654 d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >>
655 (32 - pbi1);
656
657 *v4dst = tunnel->ip6rd.relay_prefix | htonl(d);
658 return true;
659 }
660 #else
661 if (v6dst->s6_addr16[0] == htons(0x2002)) {
662 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */
663 memcpy(v4dst, &v6dst->s6_addr16[1], 4);
664 return true;
665 }
666 #endif
667 return false;
668 }
669
670 static inline __be32 try_6rd(struct ip_tunnel *tunnel,
671 const struct in6_addr *v6dst)
672 {
673 __be32 dst = 0;
674 check_6rd(tunnel, v6dst, &dst);
675 return dst;
676 }
677
678 /*
679 * This function assumes it is being called from dev_queue_xmit()
680 * and that skb is filled properly by that function.
681 */
682
683 static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb,
684 struct net_device *dev)
685 {
686 struct ip_tunnel *tunnel = netdev_priv(dev);
687 const struct iphdr *tiph = &tunnel->parms.iph;
688 const struct ipv6hdr *iph6 = ipv6_hdr(skb);
689 u8 tos = tunnel->parms.iph.tos;
690 __be16 df = tiph->frag_off;
691 struct rtable *rt; /* Route to the other host */
692 struct net_device *tdev; /* Device to other host */
693 struct iphdr *iph; /* Our new IP header */
694 unsigned int max_headroom; /* The extra header space needed */
695 __be32 dst = tiph->daddr;
696 struct flowi4 fl4;
697 int mtu;
698 const struct in6_addr *addr6;
699 int addr_type;
700
701 if (skb->protocol != htons(ETH_P_IPV6))
702 goto tx_error;
703
704 if (tos == 1)
705 tos = ipv6_get_dsfield(iph6);
706
707 /* ISATAP (RFC4214) - must come before 6to4 */
708 if (dev->priv_flags & IFF_ISATAP) {
709 struct neighbour *neigh = NULL;
710 bool do_tx_error = false;
711
712 if (skb_dst(skb))
713 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr);
714
715 if (neigh == NULL) {
716 net_dbg_ratelimited("sit: nexthop == NULL\n");
717 goto tx_error;
718 }
719
720 addr6 = (const struct in6_addr *)&neigh->primary_key;
721 addr_type = ipv6_addr_type(addr6);
722
723 if ((addr_type & IPV6_ADDR_UNICAST) &&
724 ipv6_addr_is_isatap(addr6))
725 dst = addr6->s6_addr32[3];
726 else
727 do_tx_error = true;
728
729 neigh_release(neigh);
730 if (do_tx_error)
731 goto tx_error;
732 }
733
734 if (!dst)
735 dst = try_6rd(tunnel, &iph6->daddr);
736
737 if (!dst) {
738 struct neighbour *neigh = NULL;
739 bool do_tx_error = false;
740
741 if (skb_dst(skb))
742 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr);
743
744 if (neigh == NULL) {
745 net_dbg_ratelimited("sit: nexthop == NULL\n");
746 goto tx_error;
747 }
748
749 addr6 = (const struct in6_addr *)&neigh->primary_key;
750 addr_type = ipv6_addr_type(addr6);
751
752 if (addr_type == IPV6_ADDR_ANY) {
753 addr6 = &ipv6_hdr(skb)->daddr;
754 addr_type = ipv6_addr_type(addr6);
755 }
756
757 if ((addr_type & IPV6_ADDR_COMPATv4) != 0)
758 dst = addr6->s6_addr32[3];
759 else
760 do_tx_error = true;
761
762 neigh_release(neigh);
763 if (do_tx_error)
764 goto tx_error;
765 }
766
767 rt = ip_route_output_ports(dev_net(dev), &fl4, NULL,
768 dst, tiph->saddr,
769 0, 0,
770 IPPROTO_IPV6, RT_TOS(tos),
771 tunnel->parms.link);
772 if (IS_ERR(rt)) {
773 dev->stats.tx_carrier_errors++;
774 goto tx_error_icmp;
775 }
776 if (rt->rt_type != RTN_UNICAST) {
777 ip_rt_put(rt);
778 dev->stats.tx_carrier_errors++;
779 goto tx_error_icmp;
780 }
781 tdev = rt->dst.dev;
782
783 if (tdev == dev) {
784 ip_rt_put(rt);
785 dev->stats.collisions++;
786 goto tx_error;
787 }
788
789 if (df) {
790 mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr);
791
792 if (mtu < 68) {
793 dev->stats.collisions++;
794 ip_rt_put(rt);
795 goto tx_error;
796 }
797
798 if (mtu < IPV6_MIN_MTU) {
799 mtu = IPV6_MIN_MTU;
800 df = 0;
801 }
802
803 if (tunnel->parms.iph.daddr && skb_dst(skb))
804 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
805
806 if (skb->len > mtu) {
807 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
808 ip_rt_put(rt);
809 goto tx_error;
810 }
811 }
812
813 if (tunnel->err_count > 0) {
814 if (time_before(jiffies,
815 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
816 tunnel->err_count--;
817 dst_link_failure(skb);
818 } else
819 tunnel->err_count = 0;
820 }
821
822 /*
823 * Okay, now see if we can stuff it in the buffer as-is.
824 */
825 max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr);
826
827 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
828 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
829 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
830 if (!new_skb) {
831 ip_rt_put(rt);
832 dev->stats.tx_dropped++;
833 dev_kfree_skb(skb);
834 return NETDEV_TX_OK;
835 }
836 if (skb->sk)
837 skb_set_owner_w(new_skb, skb->sk);
838 dev_kfree_skb(skb);
839 skb = new_skb;
840 iph6 = ipv6_hdr(skb);
841 }
842
843 skb->transport_header = skb->network_header;
844 skb_push(skb, sizeof(struct iphdr));
845 skb_reset_network_header(skb);
846 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
847 IPCB(skb)->flags = 0;
848 skb_dst_drop(skb);
849 skb_dst_set(skb, &rt->dst);
850
851 /*
852 * Push down and install the IPIP header.
853 */
854
855 iph = ip_hdr(skb);
856 iph->version = 4;
857 iph->ihl = sizeof(struct iphdr)>>2;
858 iph->frag_off = df;
859 iph->protocol = IPPROTO_IPV6;
860 iph->tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6));
861 iph->daddr = fl4.daddr;
862 iph->saddr = fl4.saddr;
863
864 if ((iph->ttl = tiph->ttl) == 0)
865 iph->ttl = iph6->hop_limit;
866
867 skb->ip_summed = CHECKSUM_NONE;
868 ip_select_ident(iph, skb_dst(skb), NULL);
869 iptunnel_xmit(skb, dev);
870 return NETDEV_TX_OK;
871
872 tx_error_icmp:
873 dst_link_failure(skb);
874 tx_error:
875 dev->stats.tx_errors++;
876 dev_kfree_skb(skb);
877 return NETDEV_TX_OK;
878 }
879
880 static void ipip6_tunnel_bind_dev(struct net_device *dev)
881 {
882 struct net_device *tdev = NULL;
883 struct ip_tunnel *tunnel;
884 const struct iphdr *iph;
885 struct flowi4 fl4;
886
887 tunnel = netdev_priv(dev);
888 iph = &tunnel->parms.iph;
889
890 if (iph->daddr) {
891 struct rtable *rt = ip_route_output_ports(dev_net(dev), &fl4, NULL,
892 iph->daddr, iph->saddr,
893 0, 0,
894 IPPROTO_IPV6,
895 RT_TOS(iph->tos),
896 tunnel->parms.link);
897
898 if (!IS_ERR(rt)) {
899 tdev = rt->dst.dev;
900 ip_rt_put(rt);
901 }
902 dev->flags |= IFF_POINTOPOINT;
903 }
904
905 if (!tdev && tunnel->parms.link)
906 tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link);
907
908 if (tdev) {
909 dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr);
910 dev->mtu = tdev->mtu - sizeof(struct iphdr);
911 if (dev->mtu < IPV6_MIN_MTU)
912 dev->mtu = IPV6_MIN_MTU;
913 }
914 dev->iflink = tunnel->parms.link;
915 }
916
917 static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p)
918 {
919 struct net *net = dev_net(t->dev);
920 struct sit_net *sitn = net_generic(net, sit_net_id);
921
922 ipip6_tunnel_unlink(sitn, t);
923 synchronize_net();
924 t->parms.iph.saddr = p->iph.saddr;
925 t->parms.iph.daddr = p->iph.daddr;
926 memcpy(t->dev->dev_addr, &p->iph.saddr, 4);
927 memcpy(t->dev->broadcast, &p->iph.daddr, 4);
928 ipip6_tunnel_link(sitn, t);
929 t->parms.iph.ttl = p->iph.ttl;
930 t->parms.iph.tos = p->iph.tos;
931 if (t->parms.link != p->link) {
932 t->parms.link = p->link;
933 ipip6_tunnel_bind_dev(t->dev);
934 }
935 netdev_state_change(t->dev);
936 }
937
938 #ifdef CONFIG_IPV6_SIT_6RD
939 static int ipip6_tunnel_update_6rd(struct ip_tunnel *t,
940 struct ip_tunnel_6rd *ip6rd)
941 {
942 struct in6_addr prefix;
943 __be32 relay_prefix;
944
945 if (ip6rd->relay_prefixlen > 32 ||
946 ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64)
947 return -EINVAL;
948
949 ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen);
950 if (!ipv6_addr_equal(&prefix, &ip6rd->prefix))
951 return -EINVAL;
952 if (ip6rd->relay_prefixlen)
953 relay_prefix = ip6rd->relay_prefix &
954 htonl(0xffffffffUL <<
955 (32 - ip6rd->relay_prefixlen));
956 else
957 relay_prefix = 0;
958 if (relay_prefix != ip6rd->relay_prefix)
959 return -EINVAL;
960
961 t->ip6rd.prefix = prefix;
962 t->ip6rd.relay_prefix = relay_prefix;
963 t->ip6rd.prefixlen = ip6rd->prefixlen;
964 t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen;
965 netdev_state_change(t->dev);
966 return 0;
967 }
968 #endif
969
970 static int
971 ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
972 {
973 int err = 0;
974 struct ip_tunnel_parm p;
975 struct ip_tunnel_prl prl;
976 struct ip_tunnel *t;
977 struct net *net = dev_net(dev);
978 struct sit_net *sitn = net_generic(net, sit_net_id);
979 #ifdef CONFIG_IPV6_SIT_6RD
980 struct ip_tunnel_6rd ip6rd;
981 #endif
982
983 switch (cmd) {
984 case SIOCGETTUNNEL:
985 #ifdef CONFIG_IPV6_SIT_6RD
986 case SIOCGET6RD:
987 #endif
988 t = NULL;
989 if (dev == sitn->fb_tunnel_dev) {
990 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
991 err = -EFAULT;
992 break;
993 }
994 t = ipip6_tunnel_locate(net, &p, 0);
995 }
996 if (t == NULL)
997 t = netdev_priv(dev);
998
999 err = -EFAULT;
1000 if (cmd == SIOCGETTUNNEL) {
1001 memcpy(&p, &t->parms, sizeof(p));
1002 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p,
1003 sizeof(p)))
1004 goto done;
1005 #ifdef CONFIG_IPV6_SIT_6RD
1006 } else {
1007 ip6rd.prefix = t->ip6rd.prefix;
1008 ip6rd.relay_prefix = t->ip6rd.relay_prefix;
1009 ip6rd.prefixlen = t->ip6rd.prefixlen;
1010 ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen;
1011 if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd,
1012 sizeof(ip6rd)))
1013 goto done;
1014 #endif
1015 }
1016 err = 0;
1017 break;
1018
1019 case SIOCADDTUNNEL:
1020 case SIOCCHGTUNNEL:
1021 err = -EPERM;
1022 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1023 goto done;
1024
1025 err = -EFAULT;
1026 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1027 goto done;
1028
1029 err = -EINVAL;
1030 if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 ||
1031 p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
1032 goto done;
1033 if (p.iph.ttl)
1034 p.iph.frag_off |= htons(IP_DF);
1035
1036 t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL);
1037
1038 if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1039 if (t != NULL) {
1040 if (t->dev != dev) {
1041 err = -EEXIST;
1042 break;
1043 }
1044 } else {
1045 if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) ||
1046 (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) {
1047 err = -EINVAL;
1048 break;
1049 }
1050 t = netdev_priv(dev);
1051 }
1052
1053 ipip6_tunnel_update(t, &p);
1054 }
1055
1056 if (t) {
1057 err = 0;
1058 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
1059 err = -EFAULT;
1060 } else
1061 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1062 break;
1063
1064 case SIOCDELTUNNEL:
1065 err = -EPERM;
1066 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1067 goto done;
1068
1069 if (dev == sitn->fb_tunnel_dev) {
1070 err = -EFAULT;
1071 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1072 goto done;
1073 err = -ENOENT;
1074 if ((t = ipip6_tunnel_locate(net, &p, 0)) == NULL)
1075 goto done;
1076 err = -EPERM;
1077 if (t == netdev_priv(sitn->fb_tunnel_dev))
1078 goto done;
1079 dev = t->dev;
1080 }
1081 unregister_netdevice(dev);
1082 err = 0;
1083 break;
1084
1085 case SIOCGETPRL:
1086 err = -EINVAL;
1087 if (dev == sitn->fb_tunnel_dev)
1088 goto done;
1089 err = -ENOENT;
1090 if (!(t = netdev_priv(dev)))
1091 goto done;
1092 err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data);
1093 break;
1094
1095 case SIOCADDPRL:
1096 case SIOCDELPRL:
1097 case SIOCCHGPRL:
1098 err = -EPERM;
1099 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1100 goto done;
1101 err = -EINVAL;
1102 if (dev == sitn->fb_tunnel_dev)
1103 goto done;
1104 err = -EFAULT;
1105 if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl)))
1106 goto done;
1107 err = -ENOENT;
1108 if (!(t = netdev_priv(dev)))
1109 goto done;
1110
1111 switch (cmd) {
1112 case SIOCDELPRL:
1113 err = ipip6_tunnel_del_prl(t, &prl);
1114 break;
1115 case SIOCADDPRL:
1116 case SIOCCHGPRL:
1117 err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL);
1118 break;
1119 }
1120 netdev_state_change(dev);
1121 break;
1122
1123 #ifdef CONFIG_IPV6_SIT_6RD
1124 case SIOCADD6RD:
1125 case SIOCCHG6RD:
1126 case SIOCDEL6RD:
1127 err = -EPERM;
1128 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1129 goto done;
1130
1131 err = -EFAULT;
1132 if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data,
1133 sizeof(ip6rd)))
1134 goto done;
1135
1136 t = netdev_priv(dev);
1137
1138 if (cmd != SIOCDEL6RD) {
1139 err = ipip6_tunnel_update_6rd(t, &ip6rd);
1140 if (err < 0)
1141 goto done;
1142 } else
1143 ipip6_tunnel_clone_6rd(dev, sitn);
1144
1145 err = 0;
1146 break;
1147 #endif
1148
1149 default:
1150 err = -EINVAL;
1151 }
1152
1153 done:
1154 return err;
1155 }
1156
1157 static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu)
1158 {
1159 if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr))
1160 return -EINVAL;
1161 dev->mtu = new_mtu;
1162 return 0;
1163 }
1164
1165 static const struct net_device_ops ipip6_netdev_ops = {
1166 .ndo_uninit = ipip6_tunnel_uninit,
1167 .ndo_start_xmit = ipip6_tunnel_xmit,
1168 .ndo_do_ioctl = ipip6_tunnel_ioctl,
1169 .ndo_change_mtu = ipip6_tunnel_change_mtu,
1170 .ndo_get_stats64 = ip_tunnel_get_stats64,
1171 };
1172
1173 static void ipip6_dev_free(struct net_device *dev)
1174 {
1175 free_percpu(dev->tstats);
1176 free_netdev(dev);
1177 }
1178
1179 static void ipip6_tunnel_setup(struct net_device *dev)
1180 {
1181 dev->netdev_ops = &ipip6_netdev_ops;
1182 dev->destructor = ipip6_dev_free;
1183
1184 dev->type = ARPHRD_SIT;
1185 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr);
1186 dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr);
1187 dev->flags = IFF_NOARP;
1188 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1189 dev->iflink = 0;
1190 dev->addr_len = 4;
1191 dev->features |= NETIF_F_NETNS_LOCAL;
1192 dev->features |= NETIF_F_LLTX;
1193 }
1194
1195 static int ipip6_tunnel_init(struct net_device *dev)
1196 {
1197 struct ip_tunnel *tunnel = netdev_priv(dev);
1198
1199 tunnel->dev = dev;
1200
1201 memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
1202 memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
1203
1204 ipip6_tunnel_bind_dev(dev);
1205 dev->tstats = alloc_percpu(struct pcpu_tstats);
1206 if (!dev->tstats)
1207 return -ENOMEM;
1208
1209 return 0;
1210 }
1211
1212 static int __net_init ipip6_fb_tunnel_init(struct net_device *dev)
1213 {
1214 struct ip_tunnel *tunnel = netdev_priv(dev);
1215 struct iphdr *iph = &tunnel->parms.iph;
1216 struct net *net = dev_net(dev);
1217 struct sit_net *sitn = net_generic(net, sit_net_id);
1218
1219 tunnel->dev = dev;
1220 strcpy(tunnel->parms.name, dev->name);
1221
1222 iph->version = 4;
1223 iph->protocol = IPPROTO_IPV6;
1224 iph->ihl = 5;
1225 iph->ttl = 64;
1226
1227 dev->tstats = alloc_percpu(struct pcpu_tstats);
1228 if (!dev->tstats)
1229 return -ENOMEM;
1230 dev_hold(dev);
1231 rcu_assign_pointer(sitn->tunnels_wc[0], tunnel);
1232 return 0;
1233 }
1234
1235 static void ipip6_netlink_parms(struct nlattr *data[],
1236 struct ip_tunnel_parm *parms)
1237 {
1238 memset(parms, 0, sizeof(*parms));
1239
1240 parms->iph.version = 4;
1241 parms->iph.protocol = IPPROTO_IPV6;
1242 parms->iph.ihl = 5;
1243 parms->iph.ttl = 64;
1244
1245 if (!data)
1246 return;
1247
1248 if (data[IFLA_IPTUN_LINK])
1249 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1250
1251 if (data[IFLA_IPTUN_LOCAL])
1252 parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]);
1253
1254 if (data[IFLA_IPTUN_REMOTE])
1255 parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]);
1256
1257 if (data[IFLA_IPTUN_TTL]) {
1258 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]);
1259 if (parms->iph.ttl)
1260 parms->iph.frag_off = htons(IP_DF);
1261 }
1262
1263 if (data[IFLA_IPTUN_TOS])
1264 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]);
1265
1266 if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC]))
1267 parms->iph.frag_off = htons(IP_DF);
1268
1269 if (data[IFLA_IPTUN_FLAGS])
1270 parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]);
1271 }
1272
1273 #ifdef CONFIG_IPV6_SIT_6RD
1274 /* This function returns true when 6RD attributes are present in the nl msg */
1275 static bool ipip6_netlink_6rd_parms(struct nlattr *data[],
1276 struct ip_tunnel_6rd *ip6rd)
1277 {
1278 bool ret = false;
1279 memset(ip6rd, 0, sizeof(*ip6rd));
1280
1281 if (!data)
1282 return ret;
1283
1284 if (data[IFLA_IPTUN_6RD_PREFIX]) {
1285 ret = true;
1286 nla_memcpy(&ip6rd->prefix, data[IFLA_IPTUN_6RD_PREFIX],
1287 sizeof(struct in6_addr));
1288 }
1289
1290 if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) {
1291 ret = true;
1292 ip6rd->relay_prefix =
1293 nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]);
1294 }
1295
1296 if (data[IFLA_IPTUN_6RD_PREFIXLEN]) {
1297 ret = true;
1298 ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]);
1299 }
1300
1301 if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) {
1302 ret = true;
1303 ip6rd->relay_prefixlen =
1304 nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]);
1305 }
1306
1307 return ret;
1308 }
1309 #endif
1310
1311 static int ipip6_newlink(struct net *src_net, struct net_device *dev,
1312 struct nlattr *tb[], struct nlattr *data[])
1313 {
1314 struct net *net = dev_net(dev);
1315 struct ip_tunnel *nt;
1316 #ifdef CONFIG_IPV6_SIT_6RD
1317 struct ip_tunnel_6rd ip6rd;
1318 #endif
1319 int err;
1320
1321 nt = netdev_priv(dev);
1322 ipip6_netlink_parms(data, &nt->parms);
1323
1324 if (ipip6_tunnel_locate(net, &nt->parms, 0))
1325 return -EEXIST;
1326
1327 err = ipip6_tunnel_create(dev);
1328 if (err < 0)
1329 return err;
1330
1331 #ifdef CONFIG_IPV6_SIT_6RD
1332 if (ipip6_netlink_6rd_parms(data, &ip6rd))
1333 err = ipip6_tunnel_update_6rd(nt, &ip6rd);
1334 #endif
1335
1336 return err;
1337 }
1338
1339 static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[],
1340 struct nlattr *data[])
1341 {
1342 struct ip_tunnel *t;
1343 struct ip_tunnel_parm p;
1344 struct net *net = dev_net(dev);
1345 struct sit_net *sitn = net_generic(net, sit_net_id);
1346 #ifdef CONFIG_IPV6_SIT_6RD
1347 struct ip_tunnel_6rd ip6rd;
1348 #endif
1349
1350 if (dev == sitn->fb_tunnel_dev)
1351 return -EINVAL;
1352
1353 ipip6_netlink_parms(data, &p);
1354
1355 if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) ||
1356 (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr))
1357 return -EINVAL;
1358
1359 t = ipip6_tunnel_locate(net, &p, 0);
1360
1361 if (t) {
1362 if (t->dev != dev)
1363 return -EEXIST;
1364 } else
1365 t = netdev_priv(dev);
1366
1367 ipip6_tunnel_update(t, &p);
1368
1369 #ifdef CONFIG_IPV6_SIT_6RD
1370 if (ipip6_netlink_6rd_parms(data, &ip6rd))
1371 return ipip6_tunnel_update_6rd(t, &ip6rd);
1372 #endif
1373
1374 return 0;
1375 }
1376
1377 static size_t ipip6_get_size(const struct net_device *dev)
1378 {
1379 return
1380 /* IFLA_IPTUN_LINK */
1381 nla_total_size(4) +
1382 /* IFLA_IPTUN_LOCAL */
1383 nla_total_size(4) +
1384 /* IFLA_IPTUN_REMOTE */
1385 nla_total_size(4) +
1386 /* IFLA_IPTUN_TTL */
1387 nla_total_size(1) +
1388 /* IFLA_IPTUN_TOS */
1389 nla_total_size(1) +
1390 /* IFLA_IPTUN_PMTUDISC */
1391 nla_total_size(1) +
1392 /* IFLA_IPTUN_FLAGS */
1393 nla_total_size(2) +
1394 #ifdef CONFIG_IPV6_SIT_6RD
1395 /* IFLA_IPTUN_6RD_PREFIX */
1396 nla_total_size(sizeof(struct in6_addr)) +
1397 /* IFLA_IPTUN_6RD_RELAY_PREFIX */
1398 nla_total_size(4) +
1399 /* IFLA_IPTUN_6RD_PREFIXLEN */
1400 nla_total_size(2) +
1401 /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */
1402 nla_total_size(2) +
1403 #endif
1404 0;
1405 }
1406
1407 static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev)
1408 {
1409 struct ip_tunnel *tunnel = netdev_priv(dev);
1410 struct ip_tunnel_parm *parm = &tunnel->parms;
1411
1412 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
1413 nla_put_be32(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) ||
1414 nla_put_be32(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) ||
1415 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) ||
1416 nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) ||
1417 nla_put_u8(skb, IFLA_IPTUN_PMTUDISC,
1418 !!(parm->iph.frag_off & htons(IP_DF))) ||
1419 nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags))
1420 goto nla_put_failure;
1421
1422 #ifdef CONFIG_IPV6_SIT_6RD
1423 if (nla_put(skb, IFLA_IPTUN_6RD_PREFIX, sizeof(struct in6_addr),
1424 &tunnel->ip6rd.prefix) ||
1425 nla_put_be32(skb, IFLA_IPTUN_6RD_RELAY_PREFIX,
1426 tunnel->ip6rd.relay_prefix) ||
1427 nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN,
1428 tunnel->ip6rd.prefixlen) ||
1429 nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN,
1430 tunnel->ip6rd.relay_prefixlen))
1431 goto nla_put_failure;
1432 #endif
1433
1434 return 0;
1435
1436 nla_put_failure:
1437 return -EMSGSIZE;
1438 }
1439
1440 static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = {
1441 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
1442 [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 },
1443 [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 },
1444 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
1445 [IFLA_IPTUN_TOS] = { .type = NLA_U8 },
1446 [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 },
1447 [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 },
1448 #ifdef CONFIG_IPV6_SIT_6RD
1449 [IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) },
1450 [IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 },
1451 [IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 },
1452 [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 },
1453 #endif
1454 };
1455
1456 static struct rtnl_link_ops sit_link_ops __read_mostly = {
1457 .kind = "sit",
1458 .maxtype = IFLA_IPTUN_MAX,
1459 .policy = ipip6_policy,
1460 .priv_size = sizeof(struct ip_tunnel),
1461 .setup = ipip6_tunnel_setup,
1462 .newlink = ipip6_newlink,
1463 .changelink = ipip6_changelink,
1464 .get_size = ipip6_get_size,
1465 .fill_info = ipip6_fill_info,
1466 };
1467
1468 static struct xfrm_tunnel sit_handler __read_mostly = {
1469 .handler = ipip6_rcv,
1470 .err_handler = ipip6_err,
1471 .priority = 1,
1472 };
1473
1474 static void __net_exit sit_destroy_tunnels(struct sit_net *sitn, struct list_head *head)
1475 {
1476 int prio;
1477
1478 for (prio = 1; prio < 4; prio++) {
1479 int h;
1480 for (h = 0; h < HASH_SIZE; h++) {
1481 struct ip_tunnel *t;
1482
1483 t = rtnl_dereference(sitn->tunnels[prio][h]);
1484 while (t != NULL) {
1485 unregister_netdevice_queue(t->dev, head);
1486 t = rtnl_dereference(t->next);
1487 }
1488 }
1489 }
1490 }
1491
1492 static int __net_init sit_init_net(struct net *net)
1493 {
1494 struct sit_net *sitn = net_generic(net, sit_net_id);
1495 struct ip_tunnel *t;
1496 int err;
1497
1498 sitn->tunnels[0] = sitn->tunnels_wc;
1499 sitn->tunnels[1] = sitn->tunnels_l;
1500 sitn->tunnels[2] = sitn->tunnels_r;
1501 sitn->tunnels[3] = sitn->tunnels_r_l;
1502
1503 sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0",
1504 ipip6_tunnel_setup);
1505 if (!sitn->fb_tunnel_dev) {
1506 err = -ENOMEM;
1507 goto err_alloc_dev;
1508 }
1509 dev_net_set(sitn->fb_tunnel_dev, net);
1510
1511 err = ipip6_fb_tunnel_init(sitn->fb_tunnel_dev);
1512 if (err)
1513 goto err_dev_free;
1514
1515 ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn);
1516
1517 if ((err = register_netdev(sitn->fb_tunnel_dev)))
1518 goto err_reg_dev;
1519
1520 t = netdev_priv(sitn->fb_tunnel_dev);
1521
1522 strcpy(t->parms.name, sitn->fb_tunnel_dev->name);
1523 return 0;
1524
1525 err_reg_dev:
1526 dev_put(sitn->fb_tunnel_dev);
1527 err_dev_free:
1528 ipip6_dev_free(sitn->fb_tunnel_dev);
1529 err_alloc_dev:
1530 return err;
1531 }
1532
1533 static void __net_exit sit_exit_net(struct net *net)
1534 {
1535 struct sit_net *sitn = net_generic(net, sit_net_id);
1536 LIST_HEAD(list);
1537
1538 rtnl_lock();
1539 sit_destroy_tunnels(sitn, &list);
1540 unregister_netdevice_queue(sitn->fb_tunnel_dev, &list);
1541 unregister_netdevice_many(&list);
1542 rtnl_unlock();
1543 }
1544
1545 static struct pernet_operations sit_net_ops = {
1546 .init = sit_init_net,
1547 .exit = sit_exit_net,
1548 .id = &sit_net_id,
1549 .size = sizeof(struct sit_net),
1550 };
1551
1552 static void __exit sit_cleanup(void)
1553 {
1554 rtnl_link_unregister(&sit_link_ops);
1555 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
1556
1557 unregister_pernet_device(&sit_net_ops);
1558 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1559 }
1560
1561 static int __init sit_init(void)
1562 {
1563 int err;
1564
1565 pr_info("IPv6 over IPv4 tunneling driver\n");
1566
1567 err = register_pernet_device(&sit_net_ops);
1568 if (err < 0)
1569 return err;
1570 err = xfrm4_tunnel_register(&sit_handler, AF_INET6);
1571 if (err < 0) {
1572 pr_info("%s: can't add protocol\n", __func__);
1573 goto xfrm_tunnel_failed;
1574 }
1575 err = rtnl_link_register(&sit_link_ops);
1576 if (err < 0)
1577 goto rtnl_link_failed;
1578
1579 out:
1580 return err;
1581
1582 rtnl_link_failed:
1583 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
1584 xfrm_tunnel_failed:
1585 unregister_pernet_device(&sit_net_ops);
1586 goto out;
1587 }
1588
1589 module_init(sit_init);
1590 module_exit(sit_cleanup);
1591 MODULE_LICENSE("GPL");
1592 MODULE_ALIAS_NETDEV("sit0");
Ubuntu Artful kernel mirror