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VXLAN: Use IP Tunnels tunnel ENC encap API
[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 static struct rtnl_link_stats64 *ipip6_get_stats64(struct net_device *dev,
91 struct rtnl_link_stats64 *tot)
92 {
93 int i;
94
95 for_each_possible_cpu(i) {
96 const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i);
97 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
98 unsigned int start;
99
100 do {
101 start = u64_stats_fetch_begin_bh(&tstats->syncp);
102 rx_packets = tstats->rx_packets;
103 tx_packets = tstats->tx_packets;
104 rx_bytes = tstats->rx_bytes;
105 tx_bytes = tstats->tx_bytes;
106 } while (u64_stats_fetch_retry_bh(&tstats->syncp, start));
107
108 tot->rx_packets += rx_packets;
109 tot->tx_packets += tx_packets;
110 tot->rx_bytes += rx_bytes;
111 tot->tx_bytes += tx_bytes;
112 }
113
114 tot->rx_errors = dev->stats.rx_errors;
115 tot->rx_frame_errors = dev->stats.rx_frame_errors;
116 tot->tx_fifo_errors = dev->stats.tx_fifo_errors;
117 tot->tx_carrier_errors = dev->stats.tx_carrier_errors;
118 tot->tx_dropped = dev->stats.tx_dropped;
119 tot->tx_aborted_errors = dev->stats.tx_aborted_errors;
120 tot->tx_errors = dev->stats.tx_errors;
121
122 return tot;
123 }
124
125 /*
126 * Must be invoked with rcu_read_lock
127 */
128 static struct ip_tunnel *ipip6_tunnel_lookup(struct net *net,
129 struct net_device *dev, __be32 remote, __be32 local)
130 {
131 unsigned int h0 = HASH(remote);
132 unsigned int h1 = HASH(local);
133 struct ip_tunnel *t;
134 struct sit_net *sitn = net_generic(net, sit_net_id);
135
136 for_each_ip_tunnel_rcu(t, sitn->tunnels_r_l[h0 ^ h1]) {
137 if (local == t->parms.iph.saddr &&
138 remote == t->parms.iph.daddr &&
139 (!dev || !t->parms.link || dev->iflink == t->parms.link) &&
140 (t->dev->flags & IFF_UP))
141 return t;
142 }
143 for_each_ip_tunnel_rcu(t, sitn->tunnels_r[h0]) {
144 if (remote == t->parms.iph.daddr &&
145 (!dev || !t->parms.link || dev->iflink == t->parms.link) &&
146 (t->dev->flags & IFF_UP))
147 return t;
148 }
149 for_each_ip_tunnel_rcu(t, sitn->tunnels_l[h1]) {
150 if (local == t->parms.iph.saddr &&
151 (!dev || !t->parms.link || dev->iflink == t->parms.link) &&
152 (t->dev->flags & IFF_UP))
153 return t;
154 }
155 t = rcu_dereference(sitn->tunnels_wc[0]);
156 if ((t != NULL) && (t->dev->flags & IFF_UP))
157 return t;
158 return NULL;
159 }
160
161 static struct ip_tunnel __rcu **__ipip6_bucket(struct sit_net *sitn,
162 struct ip_tunnel_parm *parms)
163 {
164 __be32 remote = parms->iph.daddr;
165 __be32 local = parms->iph.saddr;
166 unsigned int h = 0;
167 int prio = 0;
168
169 if (remote) {
170 prio |= 2;
171 h ^= HASH(remote);
172 }
173 if (local) {
174 prio |= 1;
175 h ^= HASH(local);
176 }
177 return &sitn->tunnels[prio][h];
178 }
179
180 static inline struct ip_tunnel __rcu **ipip6_bucket(struct sit_net *sitn,
181 struct ip_tunnel *t)
182 {
183 return __ipip6_bucket(sitn, &t->parms);
184 }
185
186 static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t)
187 {
188 struct ip_tunnel __rcu **tp;
189 struct ip_tunnel *iter;
190
191 for (tp = ipip6_bucket(sitn, t);
192 (iter = rtnl_dereference(*tp)) != NULL;
193 tp = &iter->next) {
194 if (t == iter) {
195 rcu_assign_pointer(*tp, t->next);
196 break;
197 }
198 }
199 }
200
201 static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t)
202 {
203 struct ip_tunnel __rcu **tp = ipip6_bucket(sitn, t);
204
205 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
206 rcu_assign_pointer(*tp, t);
207 }
208
209 static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn)
210 {
211 #ifdef CONFIG_IPV6_SIT_6RD
212 struct ip_tunnel *t = netdev_priv(dev);
213
214 if (t->dev == sitn->fb_tunnel_dev) {
215 ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0);
216 t->ip6rd.relay_prefix = 0;
217 t->ip6rd.prefixlen = 16;
218 t->ip6rd.relay_prefixlen = 0;
219 } else {
220 struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev);
221 memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd));
222 }
223 #endif
224 }
225
226 static int ipip6_tunnel_create(struct net_device *dev)
227 {
228 struct ip_tunnel *t = netdev_priv(dev);
229 struct net *net = dev_net(dev);
230 struct sit_net *sitn = net_generic(net, sit_net_id);
231 int err;
232
233 err = ipip6_tunnel_init(dev);
234 if (err < 0)
235 goto out;
236 ipip6_tunnel_clone_6rd(dev, sitn);
237
238 if ((__force u16)t->parms.i_flags & SIT_ISATAP)
239 dev->priv_flags |= IFF_ISATAP;
240
241 err = register_netdevice(dev);
242 if (err < 0)
243 goto out;
244
245 strcpy(t->parms.name, dev->name);
246 dev->rtnl_link_ops = &sit_link_ops;
247
248 dev_hold(dev);
249
250 ipip6_tunnel_link(sitn, t);
251 return 0;
252
253 out:
254 return err;
255 }
256
257 static struct ip_tunnel *ipip6_tunnel_locate(struct net *net,
258 struct ip_tunnel_parm *parms, int create)
259 {
260 __be32 remote = parms->iph.daddr;
261 __be32 local = parms->iph.saddr;
262 struct ip_tunnel *t, *nt;
263 struct ip_tunnel __rcu **tp;
264 struct net_device *dev;
265 char name[IFNAMSIZ];
266 struct sit_net *sitn = net_generic(net, sit_net_id);
267
268 for (tp = __ipip6_bucket(sitn, parms);
269 (t = rtnl_dereference(*tp)) != NULL;
270 tp = &t->next) {
271 if (local == t->parms.iph.saddr &&
272 remote == t->parms.iph.daddr &&
273 parms->link == t->parms.link) {
274 if (create)
275 return NULL;
276 else
277 return t;
278 }
279 }
280 if (!create)
281 goto failed;
282
283 if (parms->name[0])
284 strlcpy(name, parms->name, IFNAMSIZ);
285 else
286 strcpy(name, "sit%d");
287
288 dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup);
289 if (dev == NULL)
290 return NULL;
291
292 dev_net_set(dev, net);
293
294 nt = netdev_priv(dev);
295
296 nt->parms = *parms;
297 if (ipip6_tunnel_create(dev) < 0)
298 goto failed_free;
299
300 return nt;
301
302 failed_free:
303 ipip6_dev_free(dev);
304 failed:
305 return NULL;
306 }
307
308 #define for_each_prl_rcu(start) \
309 for (prl = rcu_dereference(start); \
310 prl; \
311 prl = rcu_dereference(prl->next))
312
313 static struct ip_tunnel_prl_entry *
314 __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr)
315 {
316 struct ip_tunnel_prl_entry *prl;
317
318 for_each_prl_rcu(t->prl)
319 if (prl->addr == addr)
320 break;
321 return prl;
322
323 }
324
325 static int ipip6_tunnel_get_prl(struct ip_tunnel *t,
326 struct ip_tunnel_prl __user *a)
327 {
328 struct ip_tunnel_prl kprl, *kp;
329 struct ip_tunnel_prl_entry *prl;
330 unsigned int cmax, c = 0, ca, len;
331 int ret = 0;
332
333 if (copy_from_user(&kprl, a, sizeof(kprl)))
334 return -EFAULT;
335 cmax = kprl.datalen / sizeof(kprl);
336 if (cmax > 1 && kprl.addr != htonl(INADDR_ANY))
337 cmax = 1;
338
339 /* For simple GET or for root users,
340 * we try harder to allocate.
341 */
342 kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ?
343 kcalloc(cmax, sizeof(*kp), GFP_KERNEL) :
344 NULL;
345
346 rcu_read_lock();
347
348 ca = t->prl_count < cmax ? t->prl_count : cmax;
349
350 if (!kp) {
351 /* We don't try hard to allocate much memory for
352 * non-root users.
353 * For root users, retry allocating enough memory for
354 * the answer.
355 */
356 kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC);
357 if (!kp) {
358 ret = -ENOMEM;
359 goto out;
360 }
361 }
362
363 c = 0;
364 for_each_prl_rcu(t->prl) {
365 if (c >= cmax)
366 break;
367 if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr)
368 continue;
369 kp[c].addr = prl->addr;
370 kp[c].flags = prl->flags;
371 c++;
372 if (kprl.addr != htonl(INADDR_ANY))
373 break;
374 }
375 out:
376 rcu_read_unlock();
377
378 len = sizeof(*kp) * c;
379 ret = 0;
380 if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen))
381 ret = -EFAULT;
382
383 kfree(kp);
384
385 return ret;
386 }
387
388 static int
389 ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg)
390 {
391 struct ip_tunnel_prl_entry *p;
392 int err = 0;
393
394 if (a->addr == htonl(INADDR_ANY))
395 return -EINVAL;
396
397 ASSERT_RTNL();
398
399 for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) {
400 if (p->addr == a->addr) {
401 if (chg) {
402 p->flags = a->flags;
403 goto out;
404 }
405 err = -EEXIST;
406 goto out;
407 }
408 }
409
410 if (chg) {
411 err = -ENXIO;
412 goto out;
413 }
414
415 p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL);
416 if (!p) {
417 err = -ENOBUFS;
418 goto out;
419 }
420
421 p->next = t->prl;
422 p->addr = a->addr;
423 p->flags = a->flags;
424 t->prl_count++;
425 rcu_assign_pointer(t->prl, p);
426 out:
427 return err;
428 }
429
430 static void prl_list_destroy_rcu(struct rcu_head *head)
431 {
432 struct ip_tunnel_prl_entry *p, *n;
433
434 p = container_of(head, struct ip_tunnel_prl_entry, rcu_head);
435 do {
436 n = rcu_dereference_protected(p->next, 1);
437 kfree(p);
438 p = n;
439 } while (p);
440 }
441
442 static int
443 ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a)
444 {
445 struct ip_tunnel_prl_entry *x;
446 struct ip_tunnel_prl_entry __rcu **p;
447 int err = 0;
448
449 ASSERT_RTNL();
450
451 if (a && a->addr != htonl(INADDR_ANY)) {
452 for (p = &t->prl;
453 (x = rtnl_dereference(*p)) != NULL;
454 p = &x->next) {
455 if (x->addr == a->addr) {
456 *p = x->next;
457 kfree_rcu(x, rcu_head);
458 t->prl_count--;
459 goto out;
460 }
461 }
462 err = -ENXIO;
463 } else {
464 x = rtnl_dereference(t->prl);
465 if (x) {
466 t->prl_count = 0;
467 call_rcu(&x->rcu_head, prl_list_destroy_rcu);
468 t->prl = NULL;
469 }
470 }
471 out:
472 return err;
473 }
474
475 static int
476 isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t)
477 {
478 struct ip_tunnel_prl_entry *p;
479 int ok = 1;
480
481 rcu_read_lock();
482 p = __ipip6_tunnel_locate_prl(t, iph->saddr);
483 if (p) {
484 if (p->flags & PRL_DEFAULT)
485 skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT;
486 else
487 skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT;
488 } else {
489 const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr;
490
491 if (ipv6_addr_is_isatap(addr6) &&
492 (addr6->s6_addr32[3] == iph->saddr) &&
493 ipv6_chk_prefix(addr6, t->dev))
494 skb->ndisc_nodetype = NDISC_NODETYPE_HOST;
495 else
496 ok = 0;
497 }
498 rcu_read_unlock();
499 return ok;
500 }
501
502 static void ipip6_tunnel_uninit(struct net_device *dev)
503 {
504 struct net *net = dev_net(dev);
505 struct sit_net *sitn = net_generic(net, sit_net_id);
506
507 if (dev == sitn->fb_tunnel_dev) {
508 RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL);
509 } else {
510 ipip6_tunnel_unlink(sitn, netdev_priv(dev));
511 ipip6_tunnel_del_prl(netdev_priv(dev), NULL);
512 }
513 dev_put(dev);
514 }
515
516
517 static int ipip6_err(struct sk_buff *skb, u32 info)
518 {
519
520 /* All the routers (except for Linux) return only
521 8 bytes of packet payload. It means, that precise relaying of
522 ICMP in the real Internet is absolutely infeasible.
523 */
524 const struct iphdr *iph = (const struct iphdr *)skb->data;
525 const int type = icmp_hdr(skb)->type;
526 const int code = icmp_hdr(skb)->code;
527 struct ip_tunnel *t;
528 int err;
529
530 switch (type) {
531 default:
532 case ICMP_PARAMETERPROB:
533 return 0;
534
535 case ICMP_DEST_UNREACH:
536 switch (code) {
537 case ICMP_SR_FAILED:
538 case ICMP_PORT_UNREACH:
539 /* Impossible event. */
540 return 0;
541 default:
542 /* All others are translated to HOST_UNREACH.
543 rfc2003 contains "deep thoughts" about NET_UNREACH,
544 I believe they are just ether pollution. --ANK
545 */
546 break;
547 }
548 break;
549 case ICMP_TIME_EXCEEDED:
550 if (code != ICMP_EXC_TTL)
551 return 0;
552 break;
553 case ICMP_REDIRECT:
554 break;
555 }
556
557 err = -ENOENT;
558
559 t = ipip6_tunnel_lookup(dev_net(skb->dev),
560 skb->dev,
561 iph->daddr,
562 iph->saddr);
563 if (t == NULL)
564 goto out;
565
566 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
567 ipv4_update_pmtu(skb, dev_net(skb->dev), info,
568 t->dev->ifindex, 0, IPPROTO_IPV6, 0);
569 err = 0;
570 goto out;
571 }
572 if (type == ICMP_REDIRECT) {
573 ipv4_redirect(skb, dev_net(skb->dev), t->dev->ifindex, 0,
574 IPPROTO_IPV6, 0);
575 err = 0;
576 goto out;
577 }
578
579 if (t->parms.iph.daddr == 0)
580 goto out;
581
582 err = 0;
583 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
584 goto out;
585
586 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
587 t->err_count++;
588 else
589 t->err_count = 1;
590 t->err_time = jiffies;
591 out:
592 return err;
593 }
594
595 static inline bool is_spoofed_6rd(struct ip_tunnel *tunnel, const __be32 v4addr,
596 const struct in6_addr *v6addr)
597 {
598 __be32 v4embed = 0;
599 if (check_6rd(tunnel, v6addr, &v4embed) && v4addr != v4embed)
600 return true;
601 return false;
602 }
603
604 static int ipip6_rcv(struct sk_buff *skb)
605 {
606 const struct iphdr *iph = ip_hdr(skb);
607 struct ip_tunnel *tunnel;
608 int err;
609
610 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
611 iph->saddr, iph->daddr);
612 if (tunnel != NULL) {
613 struct pcpu_tstats *tstats;
614
615 secpath_reset(skb);
616 skb->mac_header = skb->network_header;
617 skb_reset_network_header(skb);
618 IPCB(skb)->flags = 0;
619 skb->protocol = htons(ETH_P_IPV6);
620 skb->pkt_type = PACKET_HOST;
621
622 if (tunnel->dev->priv_flags & IFF_ISATAP) {
623 if (!isatap_chksrc(skb, iph, tunnel)) {
624 tunnel->dev->stats.rx_errors++;
625 goto out;
626 }
627 } else {
628 if (is_spoofed_6rd(tunnel, iph->saddr,
629 &ipv6_hdr(skb)->saddr) ||
630 is_spoofed_6rd(tunnel, iph->daddr,
631 &ipv6_hdr(skb)->daddr)) {
632 tunnel->dev->stats.rx_errors++;
633 goto out;
634 }
635 }
636
637 __skb_tunnel_rx(skb, tunnel->dev);
638
639 err = IP_ECN_decapsulate(iph, skb);
640 if (unlikely(err)) {
641 if (log_ecn_error)
642 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
643 &iph->saddr, iph->tos);
644 if (err > 1) {
645 ++tunnel->dev->stats.rx_frame_errors;
646 ++tunnel->dev->stats.rx_errors;
647 goto out;
648 }
649 }
650
651 tstats = this_cpu_ptr(tunnel->dev->tstats);
652 tstats->rx_packets++;
653 tstats->rx_bytes += skb->len;
654
655 netif_rx(skb);
656
657 return 0;
658 }
659
660 /* no tunnel matched, let upstream know, ipsec may handle it */
661 return 1;
662 out:
663 kfree_skb(skb);
664 return 0;
665 }
666
667 /*
668 * If the IPv6 address comes from 6rd / 6to4 (RFC 3056) addr space this function
669 * stores the embedded IPv4 address in v4dst and returns true.
670 */
671 static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst,
672 __be32 *v4dst)
673 {
674 #ifdef CONFIG_IPV6_SIT_6RD
675 if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix,
676 tunnel->ip6rd.prefixlen)) {
677 unsigned int pbw0, pbi0;
678 int pbi1;
679 u32 d;
680
681 pbw0 = tunnel->ip6rd.prefixlen >> 5;
682 pbi0 = tunnel->ip6rd.prefixlen & 0x1f;
683
684 d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >>
685 tunnel->ip6rd.relay_prefixlen;
686
687 pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen;
688 if (pbi1 > 0)
689 d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >>
690 (32 - pbi1);
691
692 *v4dst = tunnel->ip6rd.relay_prefix | htonl(d);
693 return true;
694 }
695 #else
696 if (v6dst->s6_addr16[0] == htons(0x2002)) {
697 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */
698 memcpy(v4dst, &v6dst->s6_addr16[1], 4);
699 return true;
700 }
701 #endif
702 return false;
703 }
704
705 static inline __be32 try_6rd(struct ip_tunnel *tunnel,
706 const struct in6_addr *v6dst)
707 {
708 __be32 dst = 0;
709 check_6rd(tunnel, v6dst, &dst);
710 return dst;
711 }
712
713 /*
714 * This function assumes it is being called from dev_queue_xmit()
715 * and that skb is filled properly by that function.
716 */
717
718 static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb,
719 struct net_device *dev)
720 {
721 struct ip_tunnel *tunnel = netdev_priv(dev);
722 const struct iphdr *tiph = &tunnel->parms.iph;
723 const struct ipv6hdr *iph6 = ipv6_hdr(skb);
724 u8 tos = tunnel->parms.iph.tos;
725 __be16 df = tiph->frag_off;
726 struct rtable *rt; /* Route to the other host */
727 struct net_device *tdev; /* Device to other host */
728 struct iphdr *iph; /* Our new IP header */
729 unsigned int max_headroom; /* The extra header space needed */
730 __be32 dst = tiph->daddr;
731 struct flowi4 fl4;
732 int mtu;
733 const struct in6_addr *addr6;
734 int addr_type;
735
736 if (skb->protocol != htons(ETH_P_IPV6))
737 goto tx_error;
738
739 if (tos == 1)
740 tos = ipv6_get_dsfield(iph6);
741
742 /* ISATAP (RFC4214) - must come before 6to4 */
743 if (dev->priv_flags & IFF_ISATAP) {
744 struct neighbour *neigh = NULL;
745 bool do_tx_error = false;
746
747 if (skb_dst(skb))
748 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr);
749
750 if (neigh == NULL) {
751 net_dbg_ratelimited("sit: nexthop == NULL\n");
752 goto tx_error;
753 }
754
755 addr6 = (const struct in6_addr *)&neigh->primary_key;
756 addr_type = ipv6_addr_type(addr6);
757
758 if ((addr_type & IPV6_ADDR_UNICAST) &&
759 ipv6_addr_is_isatap(addr6))
760 dst = addr6->s6_addr32[3];
761 else
762 do_tx_error = true;
763
764 neigh_release(neigh);
765 if (do_tx_error)
766 goto tx_error;
767 }
768
769 if (!dst)
770 dst = try_6rd(tunnel, &iph6->daddr);
771
772 if (!dst) {
773 struct neighbour *neigh = NULL;
774 bool do_tx_error = false;
775
776 if (skb_dst(skb))
777 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr);
778
779 if (neigh == NULL) {
780 net_dbg_ratelimited("sit: nexthop == NULL\n");
781 goto tx_error;
782 }
783
784 addr6 = (const struct in6_addr *)&neigh->primary_key;
785 addr_type = ipv6_addr_type(addr6);
786
787 if (addr_type == IPV6_ADDR_ANY) {
788 addr6 = &ipv6_hdr(skb)->daddr;
789 addr_type = ipv6_addr_type(addr6);
790 }
791
792 if ((addr_type & IPV6_ADDR_COMPATv4) != 0)
793 dst = addr6->s6_addr32[3];
794 else
795 do_tx_error = true;
796
797 neigh_release(neigh);
798 if (do_tx_error)
799 goto tx_error;
800 }
801
802 rt = ip_route_output_ports(dev_net(dev), &fl4, NULL,
803 dst, tiph->saddr,
804 0, 0,
805 IPPROTO_IPV6, RT_TOS(tos),
806 tunnel->parms.link);
807 if (IS_ERR(rt)) {
808 dev->stats.tx_carrier_errors++;
809 goto tx_error_icmp;
810 }
811 if (rt->rt_type != RTN_UNICAST) {
812 ip_rt_put(rt);
813 dev->stats.tx_carrier_errors++;
814 goto tx_error_icmp;
815 }
816 tdev = rt->dst.dev;
817
818 if (tdev == dev) {
819 ip_rt_put(rt);
820 dev->stats.collisions++;
821 goto tx_error;
822 }
823
824 if (df) {
825 mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr);
826
827 if (mtu < 68) {
828 dev->stats.collisions++;
829 ip_rt_put(rt);
830 goto tx_error;
831 }
832
833 if (mtu < IPV6_MIN_MTU) {
834 mtu = IPV6_MIN_MTU;
835 df = 0;
836 }
837
838 if (tunnel->parms.iph.daddr && skb_dst(skb))
839 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
840
841 if (skb->len > mtu) {
842 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
843 ip_rt_put(rt);
844 goto tx_error;
845 }
846 }
847
848 if (tunnel->err_count > 0) {
849 if (time_before(jiffies,
850 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
851 tunnel->err_count--;
852 dst_link_failure(skb);
853 } else
854 tunnel->err_count = 0;
855 }
856
857 /*
858 * Okay, now see if we can stuff it in the buffer as-is.
859 */
860 max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr);
861
862 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
863 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
864 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
865 if (!new_skb) {
866 ip_rt_put(rt);
867 dev->stats.tx_dropped++;
868 dev_kfree_skb(skb);
869 return NETDEV_TX_OK;
870 }
871 if (skb->sk)
872 skb_set_owner_w(new_skb, skb->sk);
873 dev_kfree_skb(skb);
874 skb = new_skb;
875 iph6 = ipv6_hdr(skb);
876 }
877
878 skb->transport_header = skb->network_header;
879 skb_push(skb, sizeof(struct iphdr));
880 skb_reset_network_header(skb);
881 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
882 IPCB(skb)->flags = 0;
883 skb_dst_drop(skb);
884 skb_dst_set(skb, &rt->dst);
885
886 /*
887 * Push down and install the IPIP header.
888 */
889
890 iph = ip_hdr(skb);
891 iph->version = 4;
892 iph->ihl = sizeof(struct iphdr)>>2;
893 iph->frag_off = df;
894 iph->protocol = IPPROTO_IPV6;
895 iph->tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6));
896 iph->daddr = fl4.daddr;
897 iph->saddr = fl4.saddr;
898
899 if ((iph->ttl = tiph->ttl) == 0)
900 iph->ttl = iph6->hop_limit;
901
902 skb->ip_summed = CHECKSUM_NONE;
903 ip_select_ident(iph, skb_dst(skb), NULL);
904 iptunnel_xmit(skb, dev);
905 return NETDEV_TX_OK;
906
907 tx_error_icmp:
908 dst_link_failure(skb);
909 tx_error:
910 dev->stats.tx_errors++;
911 dev_kfree_skb(skb);
912 return NETDEV_TX_OK;
913 }
914
915 static void ipip6_tunnel_bind_dev(struct net_device *dev)
916 {
917 struct net_device *tdev = NULL;
918 struct ip_tunnel *tunnel;
919 const struct iphdr *iph;
920 struct flowi4 fl4;
921
922 tunnel = netdev_priv(dev);
923 iph = &tunnel->parms.iph;
924
925 if (iph->daddr) {
926 struct rtable *rt = ip_route_output_ports(dev_net(dev), &fl4, NULL,
927 iph->daddr, iph->saddr,
928 0, 0,
929 IPPROTO_IPV6,
930 RT_TOS(iph->tos),
931 tunnel->parms.link);
932
933 if (!IS_ERR(rt)) {
934 tdev = rt->dst.dev;
935 ip_rt_put(rt);
936 }
937 dev->flags |= IFF_POINTOPOINT;
938 }
939
940 if (!tdev && tunnel->parms.link)
941 tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link);
942
943 if (tdev) {
944 dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr);
945 dev->mtu = tdev->mtu - sizeof(struct iphdr);
946 if (dev->mtu < IPV6_MIN_MTU)
947 dev->mtu = IPV6_MIN_MTU;
948 }
949 dev->iflink = tunnel->parms.link;
950 }
951
952 static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p)
953 {
954 struct net *net = dev_net(t->dev);
955 struct sit_net *sitn = net_generic(net, sit_net_id);
956
957 ipip6_tunnel_unlink(sitn, t);
958 synchronize_net();
959 t->parms.iph.saddr = p->iph.saddr;
960 t->parms.iph.daddr = p->iph.daddr;
961 memcpy(t->dev->dev_addr, &p->iph.saddr, 4);
962 memcpy(t->dev->broadcast, &p->iph.daddr, 4);
963 ipip6_tunnel_link(sitn, t);
964 t->parms.iph.ttl = p->iph.ttl;
965 t->parms.iph.tos = p->iph.tos;
966 if (t->parms.link != p->link) {
967 t->parms.link = p->link;
968 ipip6_tunnel_bind_dev(t->dev);
969 }
970 netdev_state_change(t->dev);
971 }
972
973 #ifdef CONFIG_IPV6_SIT_6RD
974 static int ipip6_tunnel_update_6rd(struct ip_tunnel *t,
975 struct ip_tunnel_6rd *ip6rd)
976 {
977 struct in6_addr prefix;
978 __be32 relay_prefix;
979
980 if (ip6rd->relay_prefixlen > 32 ||
981 ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64)
982 return -EINVAL;
983
984 ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen);
985 if (!ipv6_addr_equal(&prefix, &ip6rd->prefix))
986 return -EINVAL;
987 if (ip6rd->relay_prefixlen)
988 relay_prefix = ip6rd->relay_prefix &
989 htonl(0xffffffffUL <<
990 (32 - ip6rd->relay_prefixlen));
991 else
992 relay_prefix = 0;
993 if (relay_prefix != ip6rd->relay_prefix)
994 return -EINVAL;
995
996 t->ip6rd.prefix = prefix;
997 t->ip6rd.relay_prefix = relay_prefix;
998 t->ip6rd.prefixlen = ip6rd->prefixlen;
999 t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen;
1000 netdev_state_change(t->dev);
1001 return 0;
1002 }
1003 #endif
1004
1005 static int
1006 ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
1007 {
1008 int err = 0;
1009 struct ip_tunnel_parm p;
1010 struct ip_tunnel_prl prl;
1011 struct ip_tunnel *t;
1012 struct net *net = dev_net(dev);
1013 struct sit_net *sitn = net_generic(net, sit_net_id);
1014 #ifdef CONFIG_IPV6_SIT_6RD
1015 struct ip_tunnel_6rd ip6rd;
1016 #endif
1017
1018 switch (cmd) {
1019 case SIOCGETTUNNEL:
1020 #ifdef CONFIG_IPV6_SIT_6RD
1021 case SIOCGET6RD:
1022 #endif
1023 t = NULL;
1024 if (dev == sitn->fb_tunnel_dev) {
1025 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1026 err = -EFAULT;
1027 break;
1028 }
1029 t = ipip6_tunnel_locate(net, &p, 0);
1030 }
1031 if (t == NULL)
1032 t = netdev_priv(dev);
1033
1034 err = -EFAULT;
1035 if (cmd == SIOCGETTUNNEL) {
1036 memcpy(&p, &t->parms, sizeof(p));
1037 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p,
1038 sizeof(p)))
1039 goto done;
1040 #ifdef CONFIG_IPV6_SIT_6RD
1041 } else {
1042 ip6rd.prefix = t->ip6rd.prefix;
1043 ip6rd.relay_prefix = t->ip6rd.relay_prefix;
1044 ip6rd.prefixlen = t->ip6rd.prefixlen;
1045 ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen;
1046 if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd,
1047 sizeof(ip6rd)))
1048 goto done;
1049 #endif
1050 }
1051 err = 0;
1052 break;
1053
1054 case SIOCADDTUNNEL:
1055 case SIOCCHGTUNNEL:
1056 err = -EPERM;
1057 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1058 goto done;
1059
1060 err = -EFAULT;
1061 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1062 goto done;
1063
1064 err = -EINVAL;
1065 if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 ||
1066 p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
1067 goto done;
1068 if (p.iph.ttl)
1069 p.iph.frag_off |= htons(IP_DF);
1070
1071 t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL);
1072
1073 if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1074 if (t != NULL) {
1075 if (t->dev != dev) {
1076 err = -EEXIST;
1077 break;
1078 }
1079 } else {
1080 if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) ||
1081 (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) {
1082 err = -EINVAL;
1083 break;
1084 }
1085 t = netdev_priv(dev);
1086 }
1087
1088 ipip6_tunnel_update(t, &p);
1089 }
1090
1091 if (t) {
1092 err = 0;
1093 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
1094 err = -EFAULT;
1095 } else
1096 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1097 break;
1098
1099 case SIOCDELTUNNEL:
1100 err = -EPERM;
1101 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1102 goto done;
1103
1104 if (dev == sitn->fb_tunnel_dev) {
1105 err = -EFAULT;
1106 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1107 goto done;
1108 err = -ENOENT;
1109 if ((t = ipip6_tunnel_locate(net, &p, 0)) == NULL)
1110 goto done;
1111 err = -EPERM;
1112 if (t == netdev_priv(sitn->fb_tunnel_dev))
1113 goto done;
1114 dev = t->dev;
1115 }
1116 unregister_netdevice(dev);
1117 err = 0;
1118 break;
1119
1120 case SIOCGETPRL:
1121 err = -EINVAL;
1122 if (dev == sitn->fb_tunnel_dev)
1123 goto done;
1124 err = -ENOENT;
1125 if (!(t = netdev_priv(dev)))
1126 goto done;
1127 err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data);
1128 break;
1129
1130 case SIOCADDPRL:
1131 case SIOCDELPRL:
1132 case SIOCCHGPRL:
1133 err = -EPERM;
1134 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1135 goto done;
1136 err = -EINVAL;
1137 if (dev == sitn->fb_tunnel_dev)
1138 goto done;
1139 err = -EFAULT;
1140 if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl)))
1141 goto done;
1142 err = -ENOENT;
1143 if (!(t = netdev_priv(dev)))
1144 goto done;
1145
1146 switch (cmd) {
1147 case SIOCDELPRL:
1148 err = ipip6_tunnel_del_prl(t, &prl);
1149 break;
1150 case SIOCADDPRL:
1151 case SIOCCHGPRL:
1152 err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL);
1153 break;
1154 }
1155 netdev_state_change(dev);
1156 break;
1157
1158 #ifdef CONFIG_IPV6_SIT_6RD
1159 case SIOCADD6RD:
1160 case SIOCCHG6RD:
1161 case SIOCDEL6RD:
1162 err = -EPERM;
1163 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1164 goto done;
1165
1166 err = -EFAULT;
1167 if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data,
1168 sizeof(ip6rd)))
1169 goto done;
1170
1171 t = netdev_priv(dev);
1172
1173 if (cmd != SIOCDEL6RD) {
1174 err = ipip6_tunnel_update_6rd(t, &ip6rd);
1175 if (err < 0)
1176 goto done;
1177 } else
1178 ipip6_tunnel_clone_6rd(dev, sitn);
1179
1180 err = 0;
1181 break;
1182 #endif
1183
1184 default:
1185 err = -EINVAL;
1186 }
1187
1188 done:
1189 return err;
1190 }
1191
1192 static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu)
1193 {
1194 if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr))
1195 return -EINVAL;
1196 dev->mtu = new_mtu;
1197 return 0;
1198 }
1199
1200 static const struct net_device_ops ipip6_netdev_ops = {
1201 .ndo_uninit = ipip6_tunnel_uninit,
1202 .ndo_start_xmit = ipip6_tunnel_xmit,
1203 .ndo_do_ioctl = ipip6_tunnel_ioctl,
1204 .ndo_change_mtu = ipip6_tunnel_change_mtu,
1205 .ndo_get_stats64= ipip6_get_stats64,
1206 };
1207
1208 static void ipip6_dev_free(struct net_device *dev)
1209 {
1210 free_percpu(dev->tstats);
1211 free_netdev(dev);
1212 }
1213
1214 static void ipip6_tunnel_setup(struct net_device *dev)
1215 {
1216 dev->netdev_ops = &ipip6_netdev_ops;
1217 dev->destructor = ipip6_dev_free;
1218
1219 dev->type = ARPHRD_SIT;
1220 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr);
1221 dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr);
1222 dev->flags = IFF_NOARP;
1223 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1224 dev->iflink = 0;
1225 dev->addr_len = 4;
1226 dev->features |= NETIF_F_NETNS_LOCAL;
1227 dev->features |= NETIF_F_LLTX;
1228 }
1229
1230 static int ipip6_tunnel_init(struct net_device *dev)
1231 {
1232 struct ip_tunnel *tunnel = netdev_priv(dev);
1233
1234 tunnel->dev = dev;
1235
1236 memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
1237 memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
1238
1239 ipip6_tunnel_bind_dev(dev);
1240 dev->tstats = alloc_percpu(struct pcpu_tstats);
1241 if (!dev->tstats)
1242 return -ENOMEM;
1243
1244 return 0;
1245 }
1246
1247 static int __net_init ipip6_fb_tunnel_init(struct net_device *dev)
1248 {
1249 struct ip_tunnel *tunnel = netdev_priv(dev);
1250 struct iphdr *iph = &tunnel->parms.iph;
1251 struct net *net = dev_net(dev);
1252 struct sit_net *sitn = net_generic(net, sit_net_id);
1253
1254 tunnel->dev = dev;
1255 strcpy(tunnel->parms.name, dev->name);
1256
1257 iph->version = 4;
1258 iph->protocol = IPPROTO_IPV6;
1259 iph->ihl = 5;
1260 iph->ttl = 64;
1261
1262 dev->tstats = alloc_percpu(struct pcpu_tstats);
1263 if (!dev->tstats)
1264 return -ENOMEM;
1265 dev_hold(dev);
1266 rcu_assign_pointer(sitn->tunnels_wc[0], tunnel);
1267 return 0;
1268 }
1269
1270 static void ipip6_netlink_parms(struct nlattr *data[],
1271 struct ip_tunnel_parm *parms)
1272 {
1273 memset(parms, 0, sizeof(*parms));
1274
1275 parms->iph.version = 4;
1276 parms->iph.protocol = IPPROTO_IPV6;
1277 parms->iph.ihl = 5;
1278 parms->iph.ttl = 64;
1279
1280 if (!data)
1281 return;
1282
1283 if (data[IFLA_IPTUN_LINK])
1284 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1285
1286 if (data[IFLA_IPTUN_LOCAL])
1287 parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]);
1288
1289 if (data[IFLA_IPTUN_REMOTE])
1290 parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]);
1291
1292 if (data[IFLA_IPTUN_TTL]) {
1293 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]);
1294 if (parms->iph.ttl)
1295 parms->iph.frag_off = htons(IP_DF);
1296 }
1297
1298 if (data[IFLA_IPTUN_TOS])
1299 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]);
1300
1301 if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC]))
1302 parms->iph.frag_off = htons(IP_DF);
1303
1304 if (data[IFLA_IPTUN_FLAGS])
1305 parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]);
1306 }
1307
1308 #ifdef CONFIG_IPV6_SIT_6RD
1309 /* This function returns true when 6RD attributes are present in the nl msg */
1310 static bool ipip6_netlink_6rd_parms(struct nlattr *data[],
1311 struct ip_tunnel_6rd *ip6rd)
1312 {
1313 bool ret = false;
1314 memset(ip6rd, 0, sizeof(*ip6rd));
1315
1316 if (!data)
1317 return ret;
1318
1319 if (data[IFLA_IPTUN_6RD_PREFIX]) {
1320 ret = true;
1321 nla_memcpy(&ip6rd->prefix, data[IFLA_IPTUN_6RD_PREFIX],
1322 sizeof(struct in6_addr));
1323 }
1324
1325 if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) {
1326 ret = true;
1327 ip6rd->relay_prefix =
1328 nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]);
1329 }
1330
1331 if (data[IFLA_IPTUN_6RD_PREFIXLEN]) {
1332 ret = true;
1333 ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]);
1334 }
1335
1336 if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) {
1337 ret = true;
1338 ip6rd->relay_prefixlen =
1339 nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]);
1340 }
1341
1342 return ret;
1343 }
1344 #endif
1345
1346 static int ipip6_newlink(struct net *src_net, struct net_device *dev,
1347 struct nlattr *tb[], struct nlattr *data[])
1348 {
1349 struct net *net = dev_net(dev);
1350 struct ip_tunnel *nt;
1351 #ifdef CONFIG_IPV6_SIT_6RD
1352 struct ip_tunnel_6rd ip6rd;
1353 #endif
1354 int err;
1355
1356 nt = netdev_priv(dev);
1357 ipip6_netlink_parms(data, &nt->parms);
1358
1359 if (ipip6_tunnel_locate(net, &nt->parms, 0))
1360 return -EEXIST;
1361
1362 err = ipip6_tunnel_create(dev);
1363 if (err < 0)
1364 return err;
1365
1366 #ifdef CONFIG_IPV6_SIT_6RD
1367 if (ipip6_netlink_6rd_parms(data, &ip6rd))
1368 err = ipip6_tunnel_update_6rd(nt, &ip6rd);
1369 #endif
1370
1371 return err;
1372 }
1373
1374 static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[],
1375 struct nlattr *data[])
1376 {
1377 struct ip_tunnel *t;
1378 struct ip_tunnel_parm p;
1379 struct net *net = dev_net(dev);
1380 struct sit_net *sitn = net_generic(net, sit_net_id);
1381 #ifdef CONFIG_IPV6_SIT_6RD
1382 struct ip_tunnel_6rd ip6rd;
1383 #endif
1384
1385 if (dev == sitn->fb_tunnel_dev)
1386 return -EINVAL;
1387
1388 ipip6_netlink_parms(data, &p);
1389
1390 if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) ||
1391 (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr))
1392 return -EINVAL;
1393
1394 t = ipip6_tunnel_locate(net, &p, 0);
1395
1396 if (t) {
1397 if (t->dev != dev)
1398 return -EEXIST;
1399 } else
1400 t = netdev_priv(dev);
1401
1402 ipip6_tunnel_update(t, &p);
1403
1404 #ifdef CONFIG_IPV6_SIT_6RD
1405 if (ipip6_netlink_6rd_parms(data, &ip6rd))
1406 return ipip6_tunnel_update_6rd(t, &ip6rd);
1407 #endif
1408
1409 return 0;
1410 }
1411
1412 static size_t ipip6_get_size(const struct net_device *dev)
1413 {
1414 return
1415 /* IFLA_IPTUN_LINK */
1416 nla_total_size(4) +
1417 /* IFLA_IPTUN_LOCAL */
1418 nla_total_size(4) +
1419 /* IFLA_IPTUN_REMOTE */
1420 nla_total_size(4) +
1421 /* IFLA_IPTUN_TTL */
1422 nla_total_size(1) +
1423 /* IFLA_IPTUN_TOS */
1424 nla_total_size(1) +
1425 /* IFLA_IPTUN_PMTUDISC */
1426 nla_total_size(1) +
1427 /* IFLA_IPTUN_FLAGS */
1428 nla_total_size(2) +
1429 #ifdef CONFIG_IPV6_SIT_6RD
1430 /* IFLA_IPTUN_6RD_PREFIX */
1431 nla_total_size(sizeof(struct in6_addr)) +
1432 /* IFLA_IPTUN_6RD_RELAY_PREFIX */
1433 nla_total_size(4) +
1434 /* IFLA_IPTUN_6RD_PREFIXLEN */
1435 nla_total_size(2) +
1436 /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */
1437 nla_total_size(2) +
1438 #endif
1439 0;
1440 }
1441
1442 static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev)
1443 {
1444 struct ip_tunnel *tunnel = netdev_priv(dev);
1445 struct ip_tunnel_parm *parm = &tunnel->parms;
1446
1447 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
1448 nla_put_be32(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) ||
1449 nla_put_be32(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) ||
1450 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) ||
1451 nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) ||
1452 nla_put_u8(skb, IFLA_IPTUN_PMTUDISC,
1453 !!(parm->iph.frag_off & htons(IP_DF))) ||
1454 nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags))
1455 goto nla_put_failure;
1456
1457 #ifdef CONFIG_IPV6_SIT_6RD
1458 if (nla_put(skb, IFLA_IPTUN_6RD_PREFIX, sizeof(struct in6_addr),
1459 &tunnel->ip6rd.prefix) ||
1460 nla_put_be32(skb, IFLA_IPTUN_6RD_RELAY_PREFIX,
1461 tunnel->ip6rd.relay_prefix) ||
1462 nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN,
1463 tunnel->ip6rd.prefixlen) ||
1464 nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN,
1465 tunnel->ip6rd.relay_prefixlen))
1466 goto nla_put_failure;
1467 #endif
1468
1469 return 0;
1470
1471 nla_put_failure:
1472 return -EMSGSIZE;
1473 }
1474
1475 static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = {
1476 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
1477 [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 },
1478 [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 },
1479 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
1480 [IFLA_IPTUN_TOS] = { .type = NLA_U8 },
1481 [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 },
1482 [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 },
1483 #ifdef CONFIG_IPV6_SIT_6RD
1484 [IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) },
1485 [IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 },
1486 [IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 },
1487 [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 },
1488 #endif
1489 };
1490
1491 static struct rtnl_link_ops sit_link_ops __read_mostly = {
1492 .kind = "sit",
1493 .maxtype = IFLA_IPTUN_MAX,
1494 .policy = ipip6_policy,
1495 .priv_size = sizeof(struct ip_tunnel),
1496 .setup = ipip6_tunnel_setup,
1497 .newlink = ipip6_newlink,
1498 .changelink = ipip6_changelink,
1499 .get_size = ipip6_get_size,
1500 .fill_info = ipip6_fill_info,
1501 };
1502
1503 static struct xfrm_tunnel sit_handler __read_mostly = {
1504 .handler = ipip6_rcv,
1505 .err_handler = ipip6_err,
1506 .priority = 1,
1507 };
1508
1509 static void __net_exit sit_destroy_tunnels(struct sit_net *sitn, struct list_head *head)
1510 {
1511 int prio;
1512
1513 for (prio = 1; prio < 4; prio++) {
1514 int h;
1515 for (h = 0; h < HASH_SIZE; h++) {
1516 struct ip_tunnel *t;
1517
1518 t = rtnl_dereference(sitn->tunnels[prio][h]);
1519 while (t != NULL) {
1520 unregister_netdevice_queue(t->dev, head);
1521 t = rtnl_dereference(t->next);
1522 }
1523 }
1524 }
1525 }
1526
1527 static int __net_init sit_init_net(struct net *net)
1528 {
1529 struct sit_net *sitn = net_generic(net, sit_net_id);
1530 struct ip_tunnel *t;
1531 int err;
1532
1533 sitn->tunnels[0] = sitn->tunnels_wc;
1534 sitn->tunnels[1] = sitn->tunnels_l;
1535 sitn->tunnels[2] = sitn->tunnels_r;
1536 sitn->tunnels[3] = sitn->tunnels_r_l;
1537
1538 sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0",
1539 ipip6_tunnel_setup);
1540 if (!sitn->fb_tunnel_dev) {
1541 err = -ENOMEM;
1542 goto err_alloc_dev;
1543 }
1544 dev_net_set(sitn->fb_tunnel_dev, net);
1545
1546 err = ipip6_fb_tunnel_init(sitn->fb_tunnel_dev);
1547 if (err)
1548 goto err_dev_free;
1549
1550 ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn);
1551
1552 if ((err = register_netdev(sitn->fb_tunnel_dev)))
1553 goto err_reg_dev;
1554
1555 t = netdev_priv(sitn->fb_tunnel_dev);
1556
1557 strcpy(t->parms.name, sitn->fb_tunnel_dev->name);
1558 return 0;
1559
1560 err_reg_dev:
1561 dev_put(sitn->fb_tunnel_dev);
1562 err_dev_free:
1563 ipip6_dev_free(sitn->fb_tunnel_dev);
1564 err_alloc_dev:
1565 return err;
1566 }
1567
1568 static void __net_exit sit_exit_net(struct net *net)
1569 {
1570 struct sit_net *sitn = net_generic(net, sit_net_id);
1571 LIST_HEAD(list);
1572
1573 rtnl_lock();
1574 sit_destroy_tunnels(sitn, &list);
1575 unregister_netdevice_queue(sitn->fb_tunnel_dev, &list);
1576 unregister_netdevice_many(&list);
1577 rtnl_unlock();
1578 }
1579
1580 static struct pernet_operations sit_net_ops = {
1581 .init = sit_init_net,
1582 .exit = sit_exit_net,
1583 .id = &sit_net_id,
1584 .size = sizeof(struct sit_net),
1585 };
1586
1587 static void __exit sit_cleanup(void)
1588 {
1589 rtnl_link_unregister(&sit_link_ops);
1590 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
1591
1592 unregister_pernet_device(&sit_net_ops);
1593 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1594 }
1595
1596 static int __init sit_init(void)
1597 {
1598 int err;
1599
1600 pr_info("IPv6 over IPv4 tunneling driver\n");
1601
1602 err = register_pernet_device(&sit_net_ops);
1603 if (err < 0)
1604 return err;
1605 err = xfrm4_tunnel_register(&sit_handler, AF_INET6);
1606 if (err < 0) {
1607 pr_info("%s: can't add protocol\n", __func__);
1608 goto xfrm_tunnel_failed;
1609 }
1610 err = rtnl_link_register(&sit_link_ops);
1611 if (err < 0)
1612 goto rtnl_link_failed;
1613
1614 out:
1615 return err;
1616
1617 rtnl_link_failed:
1618 xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
1619 xfrm_tunnel_failed:
1620 unregister_pernet_device(&sit_net_ops);
1621 goto out;
1622 }
1623
1624 module_init(sit_init);
1625 module_exit(sit_cleanup);
1626 MODULE_LICENSE("GPL");
1627 MODULE_ALIAS_NETDEV("sit0");
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