1 /*
2 * common UDP/RAW code
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
12 */
13
14 #include <linux/capability.h>
15 #include <linux/errno.h>
16 #include <linux/types.h>
17 #include <linux/kernel.h>
18 #include <linux/interrupt.h>
19 #include <linux/socket.h>
20 #include <linux/sockios.h>
21 #include <linux/in6.h>
22 #include <linux/ipv6.h>
23 #include <linux/route.h>
24 #include <linux/slab.h>
25 #include <linux/export.h>
26
27 #include <net/ipv6.h>
28 #include <net/ndisc.h>
29 #include <net/addrconf.h>
30 #include <net/transp_v6.h>
31 #include <net/ip6_route.h>
32 #include <net/tcp_states.h>
33 #include <net/dsfield.h>
34
35 #include <linux/errqueue.h>
36 #include <asm/uaccess.h>
37
ipv6_mapped_addr_any(const struct in6_addr * a)38 static bool ipv6_mapped_addr_any(const struct in6_addr *a)
39 {
40 return ipv6_addr_v4mapped(a) && (a->s6_addr32[3] == 0);
41 }
42
__ip6_datagram_connect(struct sock * sk,struct sockaddr * uaddr,int addr_len)43 static int __ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
44 {
45 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
46 struct inet_sock *inet = inet_sk(sk);
47 struct ipv6_pinfo *np = inet6_sk(sk);
48 struct in6_addr *daddr, *final_p, final;
49 struct dst_entry *dst;
50 struct flowi6 fl6;
51 struct ip6_flowlabel *flowlabel = NULL;
52 struct ipv6_txoptions *opt;
53 int addr_type;
54 int err;
55
56 if (usin->sin6_family == AF_INET) {
57 if (__ipv6_only_sock(sk))
58 return -EAFNOSUPPORT;
59 err = __ip4_datagram_connect(sk, uaddr, addr_len);
60 goto ipv4_connected;
61 }
62
63 if (addr_len < SIN6_LEN_RFC2133)
64 return -EINVAL;
65
66 if (usin->sin6_family != AF_INET6)
67 return -EAFNOSUPPORT;
68
69 memset(&fl6, 0, sizeof(fl6));
70 if (np->sndflow) {
71 fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
72 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
73 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
74 if (flowlabel == NULL)
75 return -EINVAL;
76 }
77 }
78
79 if (ipv6_addr_any(&usin->sin6_addr)) {
80 /*
81 * connect to self
82 */
83 if (ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr))
84 ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK),
85 &usin->sin6_addr);
86 else
87 usin->sin6_addr = in6addr_loopback;
88 }
89
90 addr_type = ipv6_addr_type(&usin->sin6_addr);
91
92 daddr = &usin->sin6_addr;
93
94 if (addr_type & IPV6_ADDR_MAPPED) {
95 struct sockaddr_in sin;
96
97 if (__ipv6_only_sock(sk)) {
98 err = -ENETUNREACH;
99 goto out;
100 }
101 sin.sin_family = AF_INET;
102 sin.sin_addr.s_addr = daddr->s6_addr32[3];
103 sin.sin_port = usin->sin6_port;
104
105 err = __ip4_datagram_connect(sk,
106 (struct sockaddr *) &sin,
107 sizeof(sin));
108
109 ipv4_connected:
110 if (err)
111 goto out;
112
113 ipv6_addr_set_v4mapped(inet->inet_daddr, &sk->sk_v6_daddr);
114
115 if (ipv6_addr_any(&np->saddr) ||
116 ipv6_mapped_addr_any(&np->saddr))
117 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
118
119 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr) ||
120 ipv6_mapped_addr_any(&sk->sk_v6_rcv_saddr)) {
121 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr,
122 &sk->sk_v6_rcv_saddr);
123 if (sk->sk_prot->rehash)
124 sk->sk_prot->rehash(sk);
125 }
126
127 goto out;
128 }
129
130 if (__ipv6_addr_needs_scope_id(addr_type)) {
131 if (addr_len >= sizeof(struct sockaddr_in6) &&
132 usin->sin6_scope_id) {
133 if (sk->sk_bound_dev_if &&
134 sk->sk_bound_dev_if != usin->sin6_scope_id) {
135 err = -EINVAL;
136 goto out;
137 }
138 sk->sk_bound_dev_if = usin->sin6_scope_id;
139 }
140
141 if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST))
142 sk->sk_bound_dev_if = np->mcast_oif;
143
144 /* Connect to link-local address requires an interface */
145 if (!sk->sk_bound_dev_if) {
146 err = -EINVAL;
147 goto out;
148 }
149 }
150
151 sk->sk_v6_daddr = *daddr;
152 np->flow_label = fl6.flowlabel;
153
154 inet->inet_dport = usin->sin6_port;
155
156 /*
157 * Check for a route to destination an obtain the
158 * destination cache for it.
159 */
160
161 fl6.flowi6_proto = sk->sk_protocol;
162 fl6.daddr = sk->sk_v6_daddr;
163 fl6.saddr = np->saddr;
164 fl6.flowi6_oif = sk->sk_bound_dev_if;
165 fl6.flowi6_mark = sk->sk_mark;
166 fl6.fl6_dport = inet->inet_dport;
167 fl6.fl6_sport = inet->inet_sport;
168 fl6.flowi6_uid = sk->sk_uid;
169
170 if (!fl6.flowi6_oif && (addr_type&IPV6_ADDR_MULTICAST))
171 fl6.flowi6_oif = np->mcast_oif;
172
173 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
174
175 rcu_read_lock();
176 opt = flowlabel ? flowlabel->opt : rcu_dereference(np->opt);
177 final_p = fl6_update_dst(&fl6, opt, &final);
178 rcu_read_unlock();
179
180 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
181 err = 0;
182 if (IS_ERR(dst)) {
183 err = PTR_ERR(dst);
184 goto out;
185 }
186
187 /* source address lookup done in ip6_dst_lookup */
188
189 if (ipv6_addr_any(&np->saddr))
190 np->saddr = fl6.saddr;
191
192 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
193 sk->sk_v6_rcv_saddr = fl6.saddr;
194 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
195 if (sk->sk_prot->rehash)
196 sk->sk_prot->rehash(sk);
197 }
198
199 ip6_dst_store(sk, dst,
200 ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ?
201 &sk->sk_v6_daddr : NULL,
202 #ifdef CONFIG_IPV6_SUBTREES
203 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
204 &np->saddr :
205 #endif
206 NULL);
207
208 sk->sk_state = TCP_ESTABLISHED;
209 ip6_set_txhash(sk);
210 out:
211 fl6_sock_release(flowlabel);
212 return err;
213 }
214
ip6_datagram_connect(struct sock * sk,struct sockaddr * uaddr,int addr_len)215 int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
216 {
217 int res;
218
219 lock_sock(sk);
220 res = __ip6_datagram_connect(sk, uaddr, addr_len);
221 release_sock(sk);
222 return res;
223 }
224 EXPORT_SYMBOL_GPL(ip6_datagram_connect);
225
ip6_datagram_connect_v6_only(struct sock * sk,struct sockaddr * uaddr,int addr_len)226 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *uaddr,
227 int addr_len)
228 {
229 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, uaddr);
230 if (sin6->sin6_family != AF_INET6)
231 return -EAFNOSUPPORT;
232 return ip6_datagram_connect(sk, uaddr, addr_len);
233 }
234 EXPORT_SYMBOL_GPL(ip6_datagram_connect_v6_only);
235
ipv6_icmp_error(struct sock * sk,struct sk_buff * skb,int err,__be16 port,u32 info,u8 * payload)236 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
237 __be16 port, u32 info, u8 *payload)
238 {
239 struct ipv6_pinfo *np = inet6_sk(sk);
240 struct icmp6hdr *icmph = icmp6_hdr(skb);
241 struct sock_exterr_skb *serr;
242
243 if (!np->recverr)
244 return;
245
246 skb = skb_clone(skb, GFP_ATOMIC);
247 if (!skb)
248 return;
249
250 skb->protocol = htons(ETH_P_IPV6);
251
252 serr = SKB_EXT_ERR(skb);
253 serr->ee.ee_errno = err;
254 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
255 serr->ee.ee_type = icmph->icmp6_type;
256 serr->ee.ee_code = icmph->icmp6_code;
257 serr->ee.ee_pad = 0;
258 serr->ee.ee_info = info;
259 serr->ee.ee_data = 0;
260 serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) -
261 skb_network_header(skb);
262 serr->port = port;
263
264 __skb_pull(skb, payload - skb->data);
265 skb_reset_transport_header(skb);
266
267 if (sock_queue_err_skb(sk, skb))
268 kfree_skb(skb);
269 }
270
ipv6_local_error(struct sock * sk,int err,struct flowi6 * fl6,u32 info)271 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info)
272 {
273 struct ipv6_pinfo *np = inet6_sk(sk);
274 struct sock_exterr_skb *serr;
275 struct ipv6hdr *iph;
276 struct sk_buff *skb;
277
278 if (!np->recverr)
279 return;
280
281 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
282 if (!skb)
283 return;
284
285 skb->protocol = htons(ETH_P_IPV6);
286
287 skb_put(skb, sizeof(struct ipv6hdr));
288 skb_reset_network_header(skb);
289 iph = ipv6_hdr(skb);
290 iph->daddr = fl6->daddr;
291
292 serr = SKB_EXT_ERR(skb);
293 serr->ee.ee_errno = err;
294 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
295 serr->ee.ee_type = 0;
296 serr->ee.ee_code = 0;
297 serr->ee.ee_pad = 0;
298 serr->ee.ee_info = info;
299 serr->ee.ee_data = 0;
300 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
301 serr->port = fl6->fl6_dport;
302
303 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
304 skb_reset_transport_header(skb);
305
306 if (sock_queue_err_skb(sk, skb))
307 kfree_skb(skb);
308 }
309
ipv6_local_rxpmtu(struct sock * sk,struct flowi6 * fl6,u32 mtu)310 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu)
311 {
312 struct ipv6_pinfo *np = inet6_sk(sk);
313 struct ipv6hdr *iph;
314 struct sk_buff *skb;
315 struct ip6_mtuinfo *mtu_info;
316
317 if (!np->rxopt.bits.rxpmtu)
318 return;
319
320 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
321 if (!skb)
322 return;
323
324 skb_put(skb, sizeof(struct ipv6hdr));
325 skb_reset_network_header(skb);
326 iph = ipv6_hdr(skb);
327 iph->daddr = fl6->daddr;
328
329 mtu_info = IP6CBMTU(skb);
330
331 mtu_info->ip6m_mtu = mtu;
332 mtu_info->ip6m_addr.sin6_family = AF_INET6;
333 mtu_info->ip6m_addr.sin6_port = 0;
334 mtu_info->ip6m_addr.sin6_flowinfo = 0;
335 mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif;
336 mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr;
337
338 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
339 skb_reset_transport_header(skb);
340
341 skb = xchg(&np->rxpmtu, skb);
342 kfree_skb(skb);
343 }
344
345 /*
346 * Handle MSG_ERRQUEUE
347 */
ipv6_recv_error(struct sock * sk,struct msghdr * msg,int len,int * addr_len)348 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
349 {
350 struct ipv6_pinfo *np = inet6_sk(sk);
351 struct sock_exterr_skb *serr;
352 struct sk_buff *skb;
353 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
354 struct {
355 struct sock_extended_err ee;
356 struct sockaddr_in6 offender;
357 } errhdr;
358 int err;
359 int copied;
360
361 err = -EAGAIN;
362 skb = sock_dequeue_err_skb(sk);
363 if (skb == NULL)
364 goto out;
365
366 copied = skb->len;
367 if (copied > len) {
368 msg->msg_flags |= MSG_TRUNC;
369 copied = len;
370 }
371 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
372 if (err)
373 goto out_free_skb;
374
375 sock_recv_timestamp(msg, sk, skb);
376
377 serr = SKB_EXT_ERR(skb);
378
379 if (sin) {
380 const unsigned char *nh = skb_network_header(skb);
381 sin->sin6_family = AF_INET6;
382 sin->sin6_flowinfo = 0;
383 sin->sin6_port = serr->port;
384 if (skb->protocol == htons(ETH_P_IPV6)) {
385 const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset),
386 struct ipv6hdr, daddr);
387 sin->sin6_addr = ip6h->daddr;
388 if (np->sndflow)
389 sin->sin6_flowinfo = ip6_flowinfo(ip6h);
390 sin->sin6_scope_id =
391 ipv6_iface_scope_id(&sin->sin6_addr,
392 IP6CB(skb)->iif);
393 } else {
394 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset),
395 &sin->sin6_addr);
396 sin->sin6_scope_id = 0;
397 }
398 *addr_len = sizeof(*sin);
399 }
400
401 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
402 sin = &errhdr.offender;
403 memset(sin, 0, sizeof(*sin));
404
405 if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) {
406 sin->sin6_family = AF_INET6;
407 if (np->rxopt.all)
408 ip6_datagram_recv_common_ctl(sk, msg, skb);
409 if (skb->protocol == htons(ETH_P_IPV6)) {
410 sin->sin6_addr = ipv6_hdr(skb)->saddr;
411 if (np->rxopt.all)
412 ip6_datagram_recv_specific_ctl(sk, msg, skb);
413 sin->sin6_scope_id =
414 ipv6_iface_scope_id(&sin->sin6_addr,
415 IP6CB(skb)->iif);
416 } else {
417 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
418 &sin->sin6_addr);
419 if (inet_sk(sk)->cmsg_flags)
420 ip_cmsg_recv(msg, skb);
421 }
422 }
423
424 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
425
426 /* Now we could try to dump offended packet options */
427
428 msg->msg_flags |= MSG_ERRQUEUE;
429 err = copied;
430
431 out_free_skb:
432 kfree_skb(skb);
433 out:
434 return err;
435 }
436 EXPORT_SYMBOL_GPL(ipv6_recv_error);
437
438 /*
439 * Handle IPV6_RECVPATHMTU
440 */
ipv6_recv_rxpmtu(struct sock * sk,struct msghdr * msg,int len,int * addr_len)441 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
442 int *addr_len)
443 {
444 struct ipv6_pinfo *np = inet6_sk(sk);
445 struct sk_buff *skb;
446 struct ip6_mtuinfo mtu_info;
447 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
448 int err;
449 int copied;
450
451 err = -EAGAIN;
452 skb = xchg(&np->rxpmtu, NULL);
453 if (skb == NULL)
454 goto out;
455
456 copied = skb->len;
457 if (copied > len) {
458 msg->msg_flags |= MSG_TRUNC;
459 copied = len;
460 }
461 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
462 if (err)
463 goto out_free_skb;
464
465 sock_recv_timestamp(msg, sk, skb);
466
467 memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info));
468
469 if (sin) {
470 sin->sin6_family = AF_INET6;
471 sin->sin6_flowinfo = 0;
472 sin->sin6_port = 0;
473 sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id;
474 sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr;
475 *addr_len = sizeof(*sin);
476 }
477
478 put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info);
479
480 err = copied;
481
482 out_free_skb:
483 kfree_skb(skb);
484 out:
485 return err;
486 }
487
488
ip6_datagram_recv_common_ctl(struct sock * sk,struct msghdr * msg,struct sk_buff * skb)489 void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg,
490 struct sk_buff *skb)
491 {
492 struct ipv6_pinfo *np = inet6_sk(sk);
493 bool is_ipv6 = skb->protocol == htons(ETH_P_IPV6);
494
495 if (np->rxopt.bits.rxinfo) {
496 struct in6_pktinfo src_info;
497
498 if (is_ipv6) {
499 src_info.ipi6_ifindex = IP6CB(skb)->iif;
500 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
501 } else {
502 src_info.ipi6_ifindex =
503 PKTINFO_SKB_CB(skb)->ipi_ifindex;
504 ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr,
505 &src_info.ipi6_addr);
506 }
507 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
508 }
509 }
510
ip6_datagram_recv_specific_ctl(struct sock * sk,struct msghdr * msg,struct sk_buff * skb)511 void ip6_datagram_recv_specific_ctl(struct sock *sk, struct msghdr *msg,
512 struct sk_buff *skb)
513 {
514 struct ipv6_pinfo *np = inet6_sk(sk);
515 struct inet6_skb_parm *opt = IP6CB(skb);
516 unsigned char *nh = skb_network_header(skb);
517
518 if (np->rxopt.bits.rxhlim) {
519 int hlim = ipv6_hdr(skb)->hop_limit;
520 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
521 }
522
523 if (np->rxopt.bits.rxtclass) {
524 int tclass = ipv6_get_dsfield(ipv6_hdr(skb));
525 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
526 }
527
528 if (np->rxopt.bits.rxflow) {
529 __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh);
530 if (flowinfo)
531 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
532 }
533
534 /* HbH is allowed only once */
535 if (np->rxopt.bits.hopopts && opt->hop) {
536 u8 *ptr = nh + opt->hop;
537 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
538 }
539
540 if (opt->lastopt &&
541 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
542 /*
543 * Silly enough, but we need to reparse in order to
544 * report extension headers (except for HbH)
545 * in order.
546 *
547 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
548 * (and WILL NOT be) defined because
549 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
550 */
551 unsigned int off = sizeof(struct ipv6hdr);
552 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
553
554 while (off <= opt->lastopt) {
555 unsigned int len;
556 u8 *ptr = nh + off;
557
558 switch (nexthdr) {
559 case IPPROTO_DSTOPTS:
560 nexthdr = ptr[0];
561 len = (ptr[1] + 1) << 3;
562 if (np->rxopt.bits.dstopts)
563 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
564 break;
565 case IPPROTO_ROUTING:
566 nexthdr = ptr[0];
567 len = (ptr[1] + 1) << 3;
568 if (np->rxopt.bits.srcrt)
569 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
570 break;
571 case IPPROTO_AH:
572 nexthdr = ptr[0];
573 len = (ptr[1] + 2) << 2;
574 break;
575 default:
576 nexthdr = ptr[0];
577 len = (ptr[1] + 1) << 3;
578 break;
579 }
580
581 off += len;
582 }
583 }
584
585 /* socket options in old style */
586 if (np->rxopt.bits.rxoinfo) {
587 struct in6_pktinfo src_info;
588
589 src_info.ipi6_ifindex = opt->iif;
590 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
591 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
592 }
593 if (np->rxopt.bits.rxohlim) {
594 int hlim = ipv6_hdr(skb)->hop_limit;
595 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
596 }
597 if (np->rxopt.bits.ohopopts && opt->hop) {
598 u8 *ptr = nh + opt->hop;
599 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
600 }
601 if (np->rxopt.bits.odstopts && opt->dst0) {
602 u8 *ptr = nh + opt->dst0;
603 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
604 }
605 if (np->rxopt.bits.osrcrt && opt->srcrt) {
606 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt);
607 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
608 }
609 if (np->rxopt.bits.odstopts && opt->dst1) {
610 u8 *ptr = nh + opt->dst1;
611 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
612 }
613 if (np->rxopt.bits.rxorigdstaddr) {
614 struct sockaddr_in6 sin6;
615 __be16 *ports = (__be16 *) skb_transport_header(skb);
616
617 if (skb_transport_offset(skb) + 4 <= skb->len) {
618 /* All current transport protocols have the port numbers in the
619 * first four bytes of the transport header and this function is
620 * written with this assumption in mind.
621 */
622
623 sin6.sin6_family = AF_INET6;
624 sin6.sin6_addr = ipv6_hdr(skb)->daddr;
625 sin6.sin6_port = ports[1];
626 sin6.sin6_flowinfo = 0;
627 sin6.sin6_scope_id =
628 ipv6_iface_scope_id(&ipv6_hdr(skb)->daddr,
629 opt->iif);
630
631 put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6);
632 }
633 }
634 }
635
ip6_datagram_recv_ctl(struct sock * sk,struct msghdr * msg,struct sk_buff * skb)636 void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
637 struct sk_buff *skb)
638 {
639 ip6_datagram_recv_common_ctl(sk, msg, skb);
640 ip6_datagram_recv_specific_ctl(sk, msg, skb);
641 }
642 EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl);
643
ip6_datagram_send_ctl(struct net * net,struct sock * sk,struct msghdr * msg,struct flowi6 * fl6,struct ipv6_txoptions * opt,int * hlimit,int * tclass,int * dontfrag)644 int ip6_datagram_send_ctl(struct net *net, struct sock *sk,
645 struct msghdr *msg, struct flowi6 *fl6,
646 struct ipv6_txoptions *opt,
647 int *hlimit, int *tclass, int *dontfrag)
648 {
649 struct in6_pktinfo *src_info;
650 struct cmsghdr *cmsg;
651 struct ipv6_rt_hdr *rthdr;
652 struct ipv6_opt_hdr *hdr;
653 int len;
654 int err = 0;
655
656 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
657 int addr_type;
658
659 if (!CMSG_OK(msg, cmsg)) {
660 err = -EINVAL;
661 goto exit_f;
662 }
663
664 if (cmsg->cmsg_level != SOL_IPV6)
665 continue;
666
667 switch (cmsg->cmsg_type) {
668 case IPV6_PKTINFO:
669 case IPV6_2292PKTINFO:
670 {
671 struct net_device *dev = NULL;
672
673 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
674 err = -EINVAL;
675 goto exit_f;
676 }
677
678 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
679
680 if (src_info->ipi6_ifindex) {
681 if (fl6->flowi6_oif &&
682 src_info->ipi6_ifindex != fl6->flowi6_oif)
683 return -EINVAL;
684 fl6->flowi6_oif = src_info->ipi6_ifindex;
685 }
686
687 addr_type = __ipv6_addr_type(&src_info->ipi6_addr);
688
689 rcu_read_lock();
690 if (fl6->flowi6_oif) {
691 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
692 if (!dev) {
693 rcu_read_unlock();
694 return -ENODEV;
695 }
696 } else if (addr_type & IPV6_ADDR_LINKLOCAL) {
697 rcu_read_unlock();
698 return -EINVAL;
699 }
700
701 if (addr_type != IPV6_ADDR_ANY) {
702 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL;
703 if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) &&
704 !ipv6_chk_addr(net, &src_info->ipi6_addr,
705 strict ? dev : NULL, 0) &&
706 !ipv6_chk_acast_addr_src(net, dev,
707 &src_info->ipi6_addr))
708 err = -EINVAL;
709 else
710 fl6->saddr = src_info->ipi6_addr;
711 }
712
713 rcu_read_unlock();
714
715 if (err)
716 goto exit_f;
717
718 break;
719 }
720
721 case IPV6_FLOWINFO:
722 if (cmsg->cmsg_len < CMSG_LEN(4)) {
723 err = -EINVAL;
724 goto exit_f;
725 }
726
727 if (fl6->flowlabel&IPV6_FLOWINFO_MASK) {
728 if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
729 err = -EINVAL;
730 goto exit_f;
731 }
732 }
733 fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
734 break;
735
736 case IPV6_2292HOPOPTS:
737 case IPV6_HOPOPTS:
738 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
739 err = -EINVAL;
740 goto exit_f;
741 }
742
743 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
744 len = ((hdr->hdrlen + 1) << 3);
745 if (cmsg->cmsg_len < CMSG_LEN(len)) {
746 err = -EINVAL;
747 goto exit_f;
748 }
749 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
750 err = -EPERM;
751 goto exit_f;
752 }
753 opt->opt_nflen += len;
754 opt->hopopt = hdr;
755 break;
756
757 case IPV6_2292DSTOPTS:
758 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
759 err = -EINVAL;
760 goto exit_f;
761 }
762
763 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
764 len = ((hdr->hdrlen + 1) << 3);
765 if (cmsg->cmsg_len < CMSG_LEN(len)) {
766 err = -EINVAL;
767 goto exit_f;
768 }
769 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
770 err = -EPERM;
771 goto exit_f;
772 }
773 if (opt->dst1opt) {
774 err = -EINVAL;
775 goto exit_f;
776 }
777 opt->opt_flen += len;
778 opt->dst1opt = hdr;
779 break;
780
781 case IPV6_DSTOPTS:
782 case IPV6_RTHDRDSTOPTS:
783 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
784 err = -EINVAL;
785 goto exit_f;
786 }
787
788 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
789 len = ((hdr->hdrlen + 1) << 3);
790 if (cmsg->cmsg_len < CMSG_LEN(len)) {
791 err = -EINVAL;
792 goto exit_f;
793 }
794 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
795 err = -EPERM;
796 goto exit_f;
797 }
798 if (cmsg->cmsg_type == IPV6_DSTOPTS) {
799 opt->opt_flen += len;
800 opt->dst1opt = hdr;
801 } else {
802 opt->opt_nflen += len;
803 opt->dst0opt = hdr;
804 }
805 break;
806
807 case IPV6_2292RTHDR:
808 case IPV6_RTHDR:
809 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
810 err = -EINVAL;
811 goto exit_f;
812 }
813
814 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
815
816 switch (rthdr->type) {
817 #if IS_ENABLED(CONFIG_IPV6_MIP6)
818 case IPV6_SRCRT_TYPE_2:
819 if (rthdr->hdrlen != 2 ||
820 rthdr->segments_left != 1) {
821 err = -EINVAL;
822 goto exit_f;
823 }
824 break;
825 #endif
826 default:
827 err = -EINVAL;
828 goto exit_f;
829 }
830
831 len = ((rthdr->hdrlen + 1) << 3);
832
833 if (cmsg->cmsg_len < CMSG_LEN(len)) {
834 err = -EINVAL;
835 goto exit_f;
836 }
837
838 /* segments left must also match */
839 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
840 err = -EINVAL;
841 goto exit_f;
842 }
843
844 opt->opt_nflen += len;
845 opt->srcrt = rthdr;
846
847 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
848 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
849
850 opt->opt_nflen += dsthdrlen;
851 opt->dst0opt = opt->dst1opt;
852 opt->dst1opt = NULL;
853 opt->opt_flen -= dsthdrlen;
854 }
855
856 break;
857
858 case IPV6_2292HOPLIMIT:
859 case IPV6_HOPLIMIT:
860 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
861 err = -EINVAL;
862 goto exit_f;
863 }
864
865 *hlimit = *(int *)CMSG_DATA(cmsg);
866 if (*hlimit < -1 || *hlimit > 0xff) {
867 err = -EINVAL;
868 goto exit_f;
869 }
870
871 break;
872
873 case IPV6_TCLASS:
874 {
875 int tc;
876
877 err = -EINVAL;
878 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
879 goto exit_f;
880
881 tc = *(int *)CMSG_DATA(cmsg);
882 if (tc < -1 || tc > 0xff)
883 goto exit_f;
884
885 err = 0;
886 *tclass = tc;
887
888 break;
889 }
890
891 case IPV6_DONTFRAG:
892 {
893 int df;
894
895 err = -EINVAL;
896 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
897 goto exit_f;
898
899 df = *(int *)CMSG_DATA(cmsg);
900 if (df < 0 || df > 1)
901 goto exit_f;
902
903 err = 0;
904 *dontfrag = df;
905
906 break;
907 }
908 default:
909 LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n",
910 cmsg->cmsg_type);
911 err = -EINVAL;
912 goto exit_f;
913 }
914 }
915
916 exit_f:
917 return err;
918 }
919 EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl);
920
ip6_dgram_sock_seq_show(struct seq_file * seq,struct sock * sp,__u16 srcp,__u16 destp,int bucket)921 void ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp,
922 __u16 srcp, __u16 destp, int bucket)
923 {
924 const struct in6_addr *dest, *src;
925
926 dest = &sp->sk_v6_daddr;
927 src = &sp->sk_v6_rcv_saddr;
928 seq_printf(seq,
929 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
930 "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n",
931 bucket,
932 src->s6_addr32[0], src->s6_addr32[1],
933 src->s6_addr32[2], src->s6_addr32[3], srcp,
934 dest->s6_addr32[0], dest->s6_addr32[1],
935 dest->s6_addr32[2], dest->s6_addr32[3], destp,
936 sp->sk_state,
937 sk_wmem_alloc_get(sp),
938 sk_rmem_alloc_get(sp),
939 0, 0L, 0,
940 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
941 0,
942 sock_i_ino(sp),
943 atomic_read(&sp->sk_refcnt), sp,
944 atomic_read(&sp->sk_drops));
945 }
946