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net: introduce helper macro for_each_cmsghdr
[mirror_ubuntu-bionic-kernel.git] / net / ipv6 / datagram.c
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
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
43 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 addr_type = ipv6_addr_type(&usin->sin6_addr);
80
81 if (addr_type == IPV6_ADDR_ANY) {
82 /*
83 * connect to self
84 */
85 usin->sin6_addr.s6_addr[15] = 0x01;
86 }
87
88 daddr = &usin->sin6_addr;
89
90 if (addr_type == IPV6_ADDR_MAPPED) {
91 struct sockaddr_in sin;
92
93 if (__ipv6_only_sock(sk)) {
94 err = -ENETUNREACH;
95 goto out;
96 }
97 sin.sin_family = AF_INET;
98 sin.sin_addr.s_addr = daddr->s6_addr32[3];
99 sin.sin_port = usin->sin6_port;
100
101 err = ip4_datagram_connect(sk,
102 (struct sockaddr *) &sin,
103 sizeof(sin));
104
105 ipv4_connected:
106 if (err)
107 goto out;
108
109 ipv6_addr_set_v4mapped(inet->inet_daddr, &sk->sk_v6_daddr);
110
111 if (ipv6_addr_any(&np->saddr) ||
112 ipv6_mapped_addr_any(&np->saddr))
113 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
114
115 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr) ||
116 ipv6_mapped_addr_any(&sk->sk_v6_rcv_saddr)) {
117 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr,
118 &sk->sk_v6_rcv_saddr);
119 if (sk->sk_prot->rehash)
120 sk->sk_prot->rehash(sk);
121 }
122
123 goto out;
124 }
125
126 if (__ipv6_addr_needs_scope_id(addr_type)) {
127 if (addr_len >= sizeof(struct sockaddr_in6) &&
128 usin->sin6_scope_id) {
129 if (sk->sk_bound_dev_if &&
130 sk->sk_bound_dev_if != usin->sin6_scope_id) {
131 err = -EINVAL;
132 goto out;
133 }
134 sk->sk_bound_dev_if = usin->sin6_scope_id;
135 }
136
137 if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST))
138 sk->sk_bound_dev_if = np->mcast_oif;
139
140 /* Connect to link-local address requires an interface */
141 if (!sk->sk_bound_dev_if) {
142 err = -EINVAL;
143 goto out;
144 }
145 }
146
147 sk->sk_v6_daddr = *daddr;
148 np->flow_label = fl6.flowlabel;
149
150 inet->inet_dport = usin->sin6_port;
151
152 /*
153 * Check for a route to destination an obtain the
154 * destination cache for it.
155 */
156
157 fl6.flowi6_proto = sk->sk_protocol;
158 fl6.daddr = sk->sk_v6_daddr;
159 fl6.saddr = np->saddr;
160 fl6.flowi6_oif = sk->sk_bound_dev_if;
161 fl6.flowi6_mark = sk->sk_mark;
162 fl6.fl6_dport = inet->inet_dport;
163 fl6.fl6_sport = inet->inet_sport;
164
165 if (!fl6.flowi6_oif && (addr_type&IPV6_ADDR_MULTICAST))
166 fl6.flowi6_oif = np->mcast_oif;
167
168 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
169
170 opt = flowlabel ? flowlabel->opt : np->opt;
171 final_p = fl6_update_dst(&fl6, opt, &final);
172
173 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
174 err = 0;
175 if (IS_ERR(dst)) {
176 err = PTR_ERR(dst);
177 goto out;
178 }
179
180 /* source address lookup done in ip6_dst_lookup */
181
182 if (ipv6_addr_any(&np->saddr))
183 np->saddr = fl6.saddr;
184
185 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
186 sk->sk_v6_rcv_saddr = fl6.saddr;
187 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
188 if (sk->sk_prot->rehash)
189 sk->sk_prot->rehash(sk);
190 }
191
192 ip6_dst_store(sk, dst,
193 ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ?
194 &sk->sk_v6_daddr : NULL,
195 #ifdef CONFIG_IPV6_SUBTREES
196 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
197 &np->saddr :
198 #endif
199 NULL);
200
201 sk->sk_state = TCP_ESTABLISHED;
202 ip6_set_txhash(sk);
203 out:
204 fl6_sock_release(flowlabel);
205 return err;
206 }
207 EXPORT_SYMBOL_GPL(ip6_datagram_connect);
208
209 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *uaddr,
210 int addr_len)
211 {
212 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, uaddr);
213 if (sin6->sin6_family != AF_INET6)
214 return -EAFNOSUPPORT;
215 return ip6_datagram_connect(sk, uaddr, addr_len);
216 }
217 EXPORT_SYMBOL_GPL(ip6_datagram_connect_v6_only);
218
219 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
220 __be16 port, u32 info, u8 *payload)
221 {
222 struct ipv6_pinfo *np = inet6_sk(sk);
223 struct icmp6hdr *icmph = icmp6_hdr(skb);
224 struct sock_exterr_skb *serr;
225
226 if (!np->recverr)
227 return;
228
229 skb = skb_clone(skb, GFP_ATOMIC);
230 if (!skb)
231 return;
232
233 skb->protocol = htons(ETH_P_IPV6);
234
235 serr = SKB_EXT_ERR(skb);
236 serr->ee.ee_errno = err;
237 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
238 serr->ee.ee_type = icmph->icmp6_type;
239 serr->ee.ee_code = icmph->icmp6_code;
240 serr->ee.ee_pad = 0;
241 serr->ee.ee_info = info;
242 serr->ee.ee_data = 0;
243 serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) -
244 skb_network_header(skb);
245 serr->port = port;
246
247 __skb_pull(skb, payload - skb->data);
248 skb_reset_transport_header(skb);
249
250 if (sock_queue_err_skb(sk, skb))
251 kfree_skb(skb);
252 }
253
254 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info)
255 {
256 struct ipv6_pinfo *np = inet6_sk(sk);
257 struct sock_exterr_skb *serr;
258 struct ipv6hdr *iph;
259 struct sk_buff *skb;
260
261 if (!np->recverr)
262 return;
263
264 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
265 if (!skb)
266 return;
267
268 skb->protocol = htons(ETH_P_IPV6);
269
270 skb_put(skb, sizeof(struct ipv6hdr));
271 skb_reset_network_header(skb);
272 iph = ipv6_hdr(skb);
273 iph->daddr = fl6->daddr;
274
275 serr = SKB_EXT_ERR(skb);
276 serr->ee.ee_errno = err;
277 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
278 serr->ee.ee_type = 0;
279 serr->ee.ee_code = 0;
280 serr->ee.ee_pad = 0;
281 serr->ee.ee_info = info;
282 serr->ee.ee_data = 0;
283 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
284 serr->port = fl6->fl6_dport;
285
286 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
287 skb_reset_transport_header(skb);
288
289 if (sock_queue_err_skb(sk, skb))
290 kfree_skb(skb);
291 }
292
293 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu)
294 {
295 struct ipv6_pinfo *np = inet6_sk(sk);
296 struct ipv6hdr *iph;
297 struct sk_buff *skb;
298 struct ip6_mtuinfo *mtu_info;
299
300 if (!np->rxopt.bits.rxpmtu)
301 return;
302
303 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
304 if (!skb)
305 return;
306
307 skb_put(skb, sizeof(struct ipv6hdr));
308 skb_reset_network_header(skb);
309 iph = ipv6_hdr(skb);
310 iph->daddr = fl6->daddr;
311
312 mtu_info = IP6CBMTU(skb);
313
314 mtu_info->ip6m_mtu = mtu;
315 mtu_info->ip6m_addr.sin6_family = AF_INET6;
316 mtu_info->ip6m_addr.sin6_port = 0;
317 mtu_info->ip6m_addr.sin6_flowinfo = 0;
318 mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif;
319 mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr;
320
321 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
322 skb_reset_transport_header(skb);
323
324 skb = xchg(&np->rxpmtu, skb);
325 kfree_skb(skb);
326 }
327
328 static void ip6_datagram_prepare_pktinfo_errqueue(struct sk_buff *skb)
329 {
330 int ifindex = skb->dev ? skb->dev->ifindex : -1;
331
332 if (skb->protocol == htons(ETH_P_IPV6))
333 IP6CB(skb)->iif = ifindex;
334 else
335 PKTINFO_SKB_CB(skb)->ipi_ifindex = ifindex;
336 }
337
338 /*
339 * Handle MSG_ERRQUEUE
340 */
341 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
342 {
343 struct ipv6_pinfo *np = inet6_sk(sk);
344 struct sock_exterr_skb *serr;
345 struct sk_buff *skb;
346 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
347 struct {
348 struct sock_extended_err ee;
349 struct sockaddr_in6 offender;
350 } errhdr;
351 int err;
352 int copied;
353
354 err = -EAGAIN;
355 skb = sock_dequeue_err_skb(sk);
356 if (skb == NULL)
357 goto out;
358
359 copied = skb->len;
360 if (copied > len) {
361 msg->msg_flags |= MSG_TRUNC;
362 copied = len;
363 }
364 err = skb_copy_datagram_msg(skb, 0, msg, copied);
365 if (err)
366 goto out_free_skb;
367
368 sock_recv_timestamp(msg, sk, skb);
369
370 serr = SKB_EXT_ERR(skb);
371
372 if (sin) {
373 const unsigned char *nh = skb_network_header(skb);
374 sin->sin6_family = AF_INET6;
375 sin->sin6_flowinfo = 0;
376 sin->sin6_port = serr->port;
377 if (skb->protocol == htons(ETH_P_IPV6)) {
378 const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset),
379 struct ipv6hdr, daddr);
380 sin->sin6_addr = ip6h->daddr;
381 if (np->sndflow)
382 sin->sin6_flowinfo = ip6_flowinfo(ip6h);
383 sin->sin6_scope_id =
384 ipv6_iface_scope_id(&sin->sin6_addr,
385 IP6CB(skb)->iif);
386 } else {
387 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset),
388 &sin->sin6_addr);
389 sin->sin6_scope_id = 0;
390 }
391 *addr_len = sizeof(*sin);
392 }
393
394 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
395 sin = &errhdr.offender;
396 sin->sin6_family = AF_UNSPEC;
397 if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) {
398 sin->sin6_family = AF_INET6;
399 sin->sin6_flowinfo = 0;
400 sin->sin6_port = 0;
401 if (np->rxopt.all) {
402 if (serr->ee.ee_origin != SO_EE_ORIGIN_ICMP &&
403 serr->ee.ee_origin != SO_EE_ORIGIN_ICMP6)
404 ip6_datagram_prepare_pktinfo_errqueue(skb);
405 ip6_datagram_recv_common_ctl(sk, msg, skb);
406 }
407 if (skb->protocol == htons(ETH_P_IPV6)) {
408 sin->sin6_addr = ipv6_hdr(skb)->saddr;
409 if (np->rxopt.all)
410 ip6_datagram_recv_specific_ctl(sk, msg, skb);
411 sin->sin6_scope_id =
412 ipv6_iface_scope_id(&sin->sin6_addr,
413 IP6CB(skb)->iif);
414 } else {
415 struct inet_sock *inet = inet_sk(sk);
416
417 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
418 &sin->sin6_addr);
419 sin->sin6_scope_id = 0;
420 if (inet->cmsg_flags)
421 ip_cmsg_recv(msg, skb);
422 }
423 }
424
425 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
426
427 /* Now we could try to dump offended packet options */
428
429 msg->msg_flags |= MSG_ERRQUEUE;
430 err = copied;
431
432 out_free_skb:
433 kfree_skb(skb);
434 out:
435 return err;
436 }
437 EXPORT_SYMBOL_GPL(ipv6_recv_error);
438
439 /*
440 * Handle IPV6_RECVPATHMTU
441 */
442 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
443 int *addr_len)
444 {
445 struct ipv6_pinfo *np = inet6_sk(sk);
446 struct sk_buff *skb;
447 struct ip6_mtuinfo mtu_info;
448 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
449 int err;
450 int copied;
451
452 err = -EAGAIN;
453 skb = xchg(&np->rxpmtu, NULL);
454 if (skb == NULL)
455 goto out;
456
457 copied = skb->len;
458 if (copied > len) {
459 msg->msg_flags |= MSG_TRUNC;
460 copied = len;
461 }
462 err = skb_copy_datagram_msg(skb, 0, msg, copied);
463 if (err)
464 goto out_free_skb;
465
466 sock_recv_timestamp(msg, sk, skb);
467
468 memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info));
469
470 if (sin) {
471 sin->sin6_family = AF_INET6;
472 sin->sin6_flowinfo = 0;
473 sin->sin6_port = 0;
474 sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id;
475 sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr;
476 *addr_len = sizeof(*sin);
477 }
478
479 put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info);
480
481 err = copied;
482
483 out_free_skb:
484 kfree_skb(skb);
485 out:
486 return err;
487 }
488
489
490 void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg,
491 struct sk_buff *skb)
492 {
493 struct ipv6_pinfo *np = inet6_sk(sk);
494 bool is_ipv6 = skb->protocol == htons(ETH_P_IPV6);
495
496 if (np->rxopt.bits.rxinfo) {
497 struct in6_pktinfo src_info;
498
499 if (is_ipv6) {
500 src_info.ipi6_ifindex = IP6CB(skb)->iif;
501 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
502 } else {
503 src_info.ipi6_ifindex =
504 PKTINFO_SKB_CB(skb)->ipi_ifindex;
505 ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr,
506 &src_info.ipi6_addr);
507 }
508
509 if (src_info.ipi6_ifindex >= 0)
510 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO,
511 sizeof(src_info), &src_info);
512 }
513 }
514
515 void ip6_datagram_recv_specific_ctl(struct sock *sk, struct msghdr *msg,
516 struct sk_buff *skb)
517 {
518 struct ipv6_pinfo *np = inet6_sk(sk);
519 struct inet6_skb_parm *opt = IP6CB(skb);
520 unsigned char *nh = skb_network_header(skb);
521
522 if (np->rxopt.bits.rxhlim) {
523 int hlim = ipv6_hdr(skb)->hop_limit;
524 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
525 }
526
527 if (np->rxopt.bits.rxtclass) {
528 int tclass = ipv6_get_dsfield(ipv6_hdr(skb));
529 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
530 }
531
532 if (np->rxopt.bits.rxflow) {
533 __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh);
534 if (flowinfo)
535 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
536 }
537
538 /* HbH is allowed only once */
539 if (np->rxopt.bits.hopopts && opt->hop) {
540 u8 *ptr = nh + opt->hop;
541 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
542 }
543
544 if (opt->lastopt &&
545 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
546 /*
547 * Silly enough, but we need to reparse in order to
548 * report extension headers (except for HbH)
549 * in order.
550 *
551 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
552 * (and WILL NOT be) defined because
553 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
554 */
555 unsigned int off = sizeof(struct ipv6hdr);
556 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
557
558 while (off <= opt->lastopt) {
559 unsigned int len;
560 u8 *ptr = nh + off;
561
562 switch (nexthdr) {
563 case IPPROTO_DSTOPTS:
564 nexthdr = ptr[0];
565 len = (ptr[1] + 1) << 3;
566 if (np->rxopt.bits.dstopts)
567 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
568 break;
569 case IPPROTO_ROUTING:
570 nexthdr = ptr[0];
571 len = (ptr[1] + 1) << 3;
572 if (np->rxopt.bits.srcrt)
573 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
574 break;
575 case IPPROTO_AH:
576 nexthdr = ptr[0];
577 len = (ptr[1] + 2) << 2;
578 break;
579 default:
580 nexthdr = ptr[0];
581 len = (ptr[1] + 1) << 3;
582 break;
583 }
584
585 off += len;
586 }
587 }
588
589 /* socket options in old style */
590 if (np->rxopt.bits.rxoinfo) {
591 struct in6_pktinfo src_info;
592
593 src_info.ipi6_ifindex = opt->iif;
594 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
595 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
596 }
597 if (np->rxopt.bits.rxohlim) {
598 int hlim = ipv6_hdr(skb)->hop_limit;
599 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
600 }
601 if (np->rxopt.bits.ohopopts && opt->hop) {
602 u8 *ptr = nh + opt->hop;
603 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
604 }
605 if (np->rxopt.bits.odstopts && opt->dst0) {
606 u8 *ptr = nh + opt->dst0;
607 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
608 }
609 if (np->rxopt.bits.osrcrt && opt->srcrt) {
610 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt);
611 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
612 }
613 if (np->rxopt.bits.odstopts && opt->dst1) {
614 u8 *ptr = nh + opt->dst1;
615 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
616 }
617 if (np->rxopt.bits.rxorigdstaddr) {
618 struct sockaddr_in6 sin6;
619 __be16 *ports = (__be16 *) skb_transport_header(skb);
620
621 if (skb_transport_offset(skb) + 4 <= skb->len) {
622 /* All current transport protocols have the port numbers in the
623 * first four bytes of the transport header and this function is
624 * written with this assumption in mind.
625 */
626
627 sin6.sin6_family = AF_INET6;
628 sin6.sin6_addr = ipv6_hdr(skb)->daddr;
629 sin6.sin6_port = ports[1];
630 sin6.sin6_flowinfo = 0;
631 sin6.sin6_scope_id =
632 ipv6_iface_scope_id(&ipv6_hdr(skb)->daddr,
633 opt->iif);
634
635 put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6);
636 }
637 }
638 }
639
640 void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
641 struct sk_buff *skb)
642 {
643 ip6_datagram_recv_common_ctl(sk, msg, skb);
644 ip6_datagram_recv_specific_ctl(sk, msg, skb);
645 }
646 EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl);
647
648 int ip6_datagram_send_ctl(struct net *net, struct sock *sk,
649 struct msghdr *msg, struct flowi6 *fl6,
650 struct ipv6_txoptions *opt,
651 int *hlimit, int *tclass, int *dontfrag)
652 {
653 struct in6_pktinfo *src_info;
654 struct cmsghdr *cmsg;
655 struct ipv6_rt_hdr *rthdr;
656 struct ipv6_opt_hdr *hdr;
657 int len;
658 int err = 0;
659
660 for_each_cmsghdr(cmsg, msg) {
661 int addr_type;
662
663 if (!CMSG_OK(msg, cmsg)) {
664 err = -EINVAL;
665 goto exit_f;
666 }
667
668 if (cmsg->cmsg_level != SOL_IPV6)
669 continue;
670
671 switch (cmsg->cmsg_type) {
672 case IPV6_PKTINFO:
673 case IPV6_2292PKTINFO:
674 {
675 struct net_device *dev = NULL;
676
677 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
678 err = -EINVAL;
679 goto exit_f;
680 }
681
682 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
683
684 if (src_info->ipi6_ifindex) {
685 if (fl6->flowi6_oif &&
686 src_info->ipi6_ifindex != fl6->flowi6_oif)
687 return -EINVAL;
688 fl6->flowi6_oif = src_info->ipi6_ifindex;
689 }
690
691 addr_type = __ipv6_addr_type(&src_info->ipi6_addr);
692
693 rcu_read_lock();
694 if (fl6->flowi6_oif) {
695 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
696 if (!dev) {
697 rcu_read_unlock();
698 return -ENODEV;
699 }
700 } else if (addr_type & IPV6_ADDR_LINKLOCAL) {
701 rcu_read_unlock();
702 return -EINVAL;
703 }
704
705 if (addr_type != IPV6_ADDR_ANY) {
706 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL;
707 if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) &&
708 !ipv6_chk_addr(net, &src_info->ipi6_addr,
709 strict ? dev : NULL, 0) &&
710 !ipv6_chk_acast_addr_src(net, dev,
711 &src_info->ipi6_addr))
712 err = -EINVAL;
713 else
714 fl6->saddr = src_info->ipi6_addr;
715 }
716
717 rcu_read_unlock();
718
719 if (err)
720 goto exit_f;
721
722 break;
723 }
724
725 case IPV6_FLOWINFO:
726 if (cmsg->cmsg_len < CMSG_LEN(4)) {
727 err = -EINVAL;
728 goto exit_f;
729 }
730
731 if (fl6->flowlabel&IPV6_FLOWINFO_MASK) {
732 if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
733 err = -EINVAL;
734 goto exit_f;
735 }
736 }
737 fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
738 break;
739
740 case IPV6_2292HOPOPTS:
741 case IPV6_HOPOPTS:
742 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
743 err = -EINVAL;
744 goto exit_f;
745 }
746
747 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
748 len = ((hdr->hdrlen + 1) << 3);
749 if (cmsg->cmsg_len < CMSG_LEN(len)) {
750 err = -EINVAL;
751 goto exit_f;
752 }
753 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
754 err = -EPERM;
755 goto exit_f;
756 }
757 opt->opt_nflen += len;
758 opt->hopopt = hdr;
759 break;
760
761 case IPV6_2292DSTOPTS:
762 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
763 err = -EINVAL;
764 goto exit_f;
765 }
766
767 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
768 len = ((hdr->hdrlen + 1) << 3);
769 if (cmsg->cmsg_len < CMSG_LEN(len)) {
770 err = -EINVAL;
771 goto exit_f;
772 }
773 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
774 err = -EPERM;
775 goto exit_f;
776 }
777 if (opt->dst1opt) {
778 err = -EINVAL;
779 goto exit_f;
780 }
781 opt->opt_flen += len;
782 opt->dst1opt = hdr;
783 break;
784
785 case IPV6_DSTOPTS:
786 case IPV6_RTHDRDSTOPTS:
787 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
788 err = -EINVAL;
789 goto exit_f;
790 }
791
792 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
793 len = ((hdr->hdrlen + 1) << 3);
794 if (cmsg->cmsg_len < CMSG_LEN(len)) {
795 err = -EINVAL;
796 goto exit_f;
797 }
798 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
799 err = -EPERM;
800 goto exit_f;
801 }
802 if (cmsg->cmsg_type == IPV6_DSTOPTS) {
803 opt->opt_flen += len;
804 opt->dst1opt = hdr;
805 } else {
806 opt->opt_nflen += len;
807 opt->dst0opt = hdr;
808 }
809 break;
810
811 case IPV6_2292RTHDR:
812 case IPV6_RTHDR:
813 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
814 err = -EINVAL;
815 goto exit_f;
816 }
817
818 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
819
820 switch (rthdr->type) {
821 #if IS_ENABLED(CONFIG_IPV6_MIP6)
822 case IPV6_SRCRT_TYPE_2:
823 if (rthdr->hdrlen != 2 ||
824 rthdr->segments_left != 1) {
825 err = -EINVAL;
826 goto exit_f;
827 }
828 break;
829 #endif
830 default:
831 err = -EINVAL;
832 goto exit_f;
833 }
834
835 len = ((rthdr->hdrlen + 1) << 3);
836
837 if (cmsg->cmsg_len < CMSG_LEN(len)) {
838 err = -EINVAL;
839 goto exit_f;
840 }
841
842 /* segments left must also match */
843 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
844 err = -EINVAL;
845 goto exit_f;
846 }
847
848 opt->opt_nflen += len;
849 opt->srcrt = rthdr;
850
851 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
852 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
853
854 opt->opt_nflen += dsthdrlen;
855 opt->dst0opt = opt->dst1opt;
856 opt->dst1opt = NULL;
857 opt->opt_flen -= dsthdrlen;
858 }
859
860 break;
861
862 case IPV6_2292HOPLIMIT:
863 case IPV6_HOPLIMIT:
864 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
865 err = -EINVAL;
866 goto exit_f;
867 }
868
869 *hlimit = *(int *)CMSG_DATA(cmsg);
870 if (*hlimit < -1 || *hlimit > 0xff) {
871 err = -EINVAL;
872 goto exit_f;
873 }
874
875 break;
876
877 case IPV6_TCLASS:
878 {
879 int tc;
880
881 err = -EINVAL;
882 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
883 goto exit_f;
884
885 tc = *(int *)CMSG_DATA(cmsg);
886 if (tc < -1 || tc > 0xff)
887 goto exit_f;
888
889 err = 0;
890 *tclass = tc;
891
892 break;
893 }
894
895 case IPV6_DONTFRAG:
896 {
897 int df;
898
899 err = -EINVAL;
900 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
901 goto exit_f;
902
903 df = *(int *)CMSG_DATA(cmsg);
904 if (df < 0 || df > 1)
905 goto exit_f;
906
907 err = 0;
908 *dontfrag = df;
909
910 break;
911 }
912 default:
913 net_dbg_ratelimited("invalid cmsg type: %d\n",
914 cmsg->cmsg_type);
915 err = -EINVAL;
916 goto exit_f;
917 }
918 }
919
920 exit_f:
921 return err;
922 }
923 EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl);
924
925 void ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp,
926 __u16 srcp, __u16 destp, int bucket)
927 {
928 const struct in6_addr *dest, *src;
929
930 dest = &sp->sk_v6_daddr;
931 src = &sp->sk_v6_rcv_saddr;
932 seq_printf(seq,
933 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
934 "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n",
935 bucket,
936 src->s6_addr32[0], src->s6_addr32[1],
937 src->s6_addr32[2], src->s6_addr32[3], srcp,
938 dest->s6_addr32[0], dest->s6_addr32[1],
939 dest->s6_addr32[2], dest->s6_addr32[3], destp,
940 sp->sk_state,
941 sk_wmem_alloc_get(sp),
942 sk_rmem_alloc_get(sp),
943 0, 0L, 0,
944 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
945 0,
946 sock_i_ino(sp),
947 atomic_read(&sp->sk_refcnt), sp,
948 atomic_read(&sp->sk_drops));
949 }
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