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net: Add and use skb_copy_datagram_msg() helper.
[mirror_ubuntu-eoan-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 /*
329 * Handle MSG_ERRQUEUE
330 */
331 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
332 {
333 struct ipv6_pinfo *np = inet6_sk(sk);
334 struct sock_exterr_skb *serr;
335 struct sk_buff *skb;
336 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
337 struct {
338 struct sock_extended_err ee;
339 struct sockaddr_in6 offender;
340 } errhdr;
341 int err;
342 int copied;
343
344 err = -EAGAIN;
345 skb = sock_dequeue_err_skb(sk);
346 if (skb == NULL)
347 goto out;
348
349 copied = skb->len;
350 if (copied > len) {
351 msg->msg_flags |= MSG_TRUNC;
352 copied = len;
353 }
354 err = skb_copy_datagram_msg(skb, 0, msg, copied);
355 if (err)
356 goto out_free_skb;
357
358 sock_recv_timestamp(msg, sk, skb);
359
360 serr = SKB_EXT_ERR(skb);
361
362 if (sin) {
363 const unsigned char *nh = skb_network_header(skb);
364 sin->sin6_family = AF_INET6;
365 sin->sin6_flowinfo = 0;
366 sin->sin6_port = serr->port;
367 if (skb->protocol == htons(ETH_P_IPV6)) {
368 const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset),
369 struct ipv6hdr, daddr);
370 sin->sin6_addr = ip6h->daddr;
371 if (np->sndflow)
372 sin->sin6_flowinfo = ip6_flowinfo(ip6h);
373 sin->sin6_scope_id =
374 ipv6_iface_scope_id(&sin->sin6_addr,
375 IP6CB(skb)->iif);
376 } else {
377 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset),
378 &sin->sin6_addr);
379 sin->sin6_scope_id = 0;
380 }
381 *addr_len = sizeof(*sin);
382 }
383
384 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
385 sin = &errhdr.offender;
386 sin->sin6_family = AF_UNSPEC;
387 if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) {
388 sin->sin6_family = AF_INET6;
389 sin->sin6_flowinfo = 0;
390 sin->sin6_port = 0;
391 if (np->rxopt.all)
392 ip6_datagram_recv_common_ctl(sk, msg, skb);
393 if (skb->protocol == htons(ETH_P_IPV6)) {
394 sin->sin6_addr = ipv6_hdr(skb)->saddr;
395 if (np->rxopt.all)
396 ip6_datagram_recv_specific_ctl(sk, msg, skb);
397 sin->sin6_scope_id =
398 ipv6_iface_scope_id(&sin->sin6_addr,
399 IP6CB(skb)->iif);
400 } else {
401 struct inet_sock *inet = inet_sk(sk);
402
403 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
404 &sin->sin6_addr);
405 sin->sin6_scope_id = 0;
406 if (inet->cmsg_flags)
407 ip_cmsg_recv(msg, skb);
408 }
409 }
410
411 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
412
413 /* Now we could try to dump offended packet options */
414
415 msg->msg_flags |= MSG_ERRQUEUE;
416 err = copied;
417
418 out_free_skb:
419 kfree_skb(skb);
420 out:
421 return err;
422 }
423 EXPORT_SYMBOL_GPL(ipv6_recv_error);
424
425 /*
426 * Handle IPV6_RECVPATHMTU
427 */
428 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
429 int *addr_len)
430 {
431 struct ipv6_pinfo *np = inet6_sk(sk);
432 struct sk_buff *skb;
433 struct ip6_mtuinfo mtu_info;
434 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
435 int err;
436 int copied;
437
438 err = -EAGAIN;
439 skb = xchg(&np->rxpmtu, NULL);
440 if (skb == NULL)
441 goto out;
442
443 copied = skb->len;
444 if (copied > len) {
445 msg->msg_flags |= MSG_TRUNC;
446 copied = len;
447 }
448 err = skb_copy_datagram_msg(skb, 0, msg, copied);
449 if (err)
450 goto out_free_skb;
451
452 sock_recv_timestamp(msg, sk, skb);
453
454 memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info));
455
456 if (sin) {
457 sin->sin6_family = AF_INET6;
458 sin->sin6_flowinfo = 0;
459 sin->sin6_port = 0;
460 sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id;
461 sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr;
462 *addr_len = sizeof(*sin);
463 }
464
465 put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info);
466
467 err = copied;
468
469 out_free_skb:
470 kfree_skb(skb);
471 out:
472 return err;
473 }
474
475
476 void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg,
477 struct sk_buff *skb)
478 {
479 struct ipv6_pinfo *np = inet6_sk(sk);
480 bool is_ipv6 = skb->protocol == htons(ETH_P_IPV6);
481
482 if (np->rxopt.bits.rxinfo) {
483 struct in6_pktinfo src_info;
484
485 if (is_ipv6) {
486 src_info.ipi6_ifindex = IP6CB(skb)->iif;
487 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
488 } else {
489 src_info.ipi6_ifindex =
490 PKTINFO_SKB_CB(skb)->ipi_ifindex;
491 ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr,
492 &src_info.ipi6_addr);
493 }
494 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
495 }
496 }
497
498 void ip6_datagram_recv_specific_ctl(struct sock *sk, struct msghdr *msg,
499 struct sk_buff *skb)
500 {
501 struct ipv6_pinfo *np = inet6_sk(sk);
502 struct inet6_skb_parm *opt = IP6CB(skb);
503 unsigned char *nh = skb_network_header(skb);
504
505 if (np->rxopt.bits.rxhlim) {
506 int hlim = ipv6_hdr(skb)->hop_limit;
507 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
508 }
509
510 if (np->rxopt.bits.rxtclass) {
511 int tclass = ipv6_get_dsfield(ipv6_hdr(skb));
512 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
513 }
514
515 if (np->rxopt.bits.rxflow) {
516 __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh);
517 if (flowinfo)
518 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
519 }
520
521 /* HbH is allowed only once */
522 if (np->rxopt.bits.hopopts && opt->hop) {
523 u8 *ptr = nh + opt->hop;
524 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
525 }
526
527 if (opt->lastopt &&
528 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
529 /*
530 * Silly enough, but we need to reparse in order to
531 * report extension headers (except for HbH)
532 * in order.
533 *
534 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
535 * (and WILL NOT be) defined because
536 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
537 */
538 unsigned int off = sizeof(struct ipv6hdr);
539 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
540
541 while (off <= opt->lastopt) {
542 unsigned int len;
543 u8 *ptr = nh + off;
544
545 switch (nexthdr) {
546 case IPPROTO_DSTOPTS:
547 nexthdr = ptr[0];
548 len = (ptr[1] + 1) << 3;
549 if (np->rxopt.bits.dstopts)
550 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
551 break;
552 case IPPROTO_ROUTING:
553 nexthdr = ptr[0];
554 len = (ptr[1] + 1) << 3;
555 if (np->rxopt.bits.srcrt)
556 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
557 break;
558 case IPPROTO_AH:
559 nexthdr = ptr[0];
560 len = (ptr[1] + 2) << 2;
561 break;
562 default:
563 nexthdr = ptr[0];
564 len = (ptr[1] + 1) << 3;
565 break;
566 }
567
568 off += len;
569 }
570 }
571
572 /* socket options in old style */
573 if (np->rxopt.bits.rxoinfo) {
574 struct in6_pktinfo src_info;
575
576 src_info.ipi6_ifindex = opt->iif;
577 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
578 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
579 }
580 if (np->rxopt.bits.rxohlim) {
581 int hlim = ipv6_hdr(skb)->hop_limit;
582 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
583 }
584 if (np->rxopt.bits.ohopopts && opt->hop) {
585 u8 *ptr = nh + opt->hop;
586 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
587 }
588 if (np->rxopt.bits.odstopts && opt->dst0) {
589 u8 *ptr = nh + opt->dst0;
590 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
591 }
592 if (np->rxopt.bits.osrcrt && opt->srcrt) {
593 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt);
594 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
595 }
596 if (np->rxopt.bits.odstopts && opt->dst1) {
597 u8 *ptr = nh + opt->dst1;
598 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
599 }
600 if (np->rxopt.bits.rxorigdstaddr) {
601 struct sockaddr_in6 sin6;
602 __be16 *ports = (__be16 *) skb_transport_header(skb);
603
604 if (skb_transport_offset(skb) + 4 <= skb->len) {
605 /* All current transport protocols have the port numbers in the
606 * first four bytes of the transport header and this function is
607 * written with this assumption in mind.
608 */
609
610 sin6.sin6_family = AF_INET6;
611 sin6.sin6_addr = ipv6_hdr(skb)->daddr;
612 sin6.sin6_port = ports[1];
613 sin6.sin6_flowinfo = 0;
614 sin6.sin6_scope_id =
615 ipv6_iface_scope_id(&ipv6_hdr(skb)->daddr,
616 opt->iif);
617
618 put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6);
619 }
620 }
621 }
622
623 void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
624 struct sk_buff *skb)
625 {
626 ip6_datagram_recv_common_ctl(sk, msg, skb);
627 ip6_datagram_recv_specific_ctl(sk, msg, skb);
628 }
629 EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl);
630
631 int ip6_datagram_send_ctl(struct net *net, struct sock *sk,
632 struct msghdr *msg, struct flowi6 *fl6,
633 struct ipv6_txoptions *opt,
634 int *hlimit, int *tclass, int *dontfrag)
635 {
636 struct in6_pktinfo *src_info;
637 struct cmsghdr *cmsg;
638 struct ipv6_rt_hdr *rthdr;
639 struct ipv6_opt_hdr *hdr;
640 int len;
641 int err = 0;
642
643 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
644 int addr_type;
645
646 if (!CMSG_OK(msg, cmsg)) {
647 err = -EINVAL;
648 goto exit_f;
649 }
650
651 if (cmsg->cmsg_level != SOL_IPV6)
652 continue;
653
654 switch (cmsg->cmsg_type) {
655 case IPV6_PKTINFO:
656 case IPV6_2292PKTINFO:
657 {
658 struct net_device *dev = NULL;
659
660 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
661 err = -EINVAL;
662 goto exit_f;
663 }
664
665 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
666
667 if (src_info->ipi6_ifindex) {
668 if (fl6->flowi6_oif &&
669 src_info->ipi6_ifindex != fl6->flowi6_oif)
670 return -EINVAL;
671 fl6->flowi6_oif = src_info->ipi6_ifindex;
672 }
673
674 addr_type = __ipv6_addr_type(&src_info->ipi6_addr);
675
676 rcu_read_lock();
677 if (fl6->flowi6_oif) {
678 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
679 if (!dev) {
680 rcu_read_unlock();
681 return -ENODEV;
682 }
683 } else if (addr_type & IPV6_ADDR_LINKLOCAL) {
684 rcu_read_unlock();
685 return -EINVAL;
686 }
687
688 if (addr_type != IPV6_ADDR_ANY) {
689 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL;
690 if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) &&
691 !ipv6_chk_addr(net, &src_info->ipi6_addr,
692 strict ? dev : NULL, 0) &&
693 !ipv6_chk_acast_addr_src(net, dev,
694 &src_info->ipi6_addr))
695 err = -EINVAL;
696 else
697 fl6->saddr = src_info->ipi6_addr;
698 }
699
700 rcu_read_unlock();
701
702 if (err)
703 goto exit_f;
704
705 break;
706 }
707
708 case IPV6_FLOWINFO:
709 if (cmsg->cmsg_len < CMSG_LEN(4)) {
710 err = -EINVAL;
711 goto exit_f;
712 }
713
714 if (fl6->flowlabel&IPV6_FLOWINFO_MASK) {
715 if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
716 err = -EINVAL;
717 goto exit_f;
718 }
719 }
720 fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
721 break;
722
723 case IPV6_2292HOPOPTS:
724 case IPV6_HOPOPTS:
725 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
726 err = -EINVAL;
727 goto exit_f;
728 }
729
730 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
731 len = ((hdr->hdrlen + 1) << 3);
732 if (cmsg->cmsg_len < CMSG_LEN(len)) {
733 err = -EINVAL;
734 goto exit_f;
735 }
736 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
737 err = -EPERM;
738 goto exit_f;
739 }
740 opt->opt_nflen += len;
741 opt->hopopt = hdr;
742 break;
743
744 case IPV6_2292DSTOPTS:
745 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
746 err = -EINVAL;
747 goto exit_f;
748 }
749
750 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
751 len = ((hdr->hdrlen + 1) << 3);
752 if (cmsg->cmsg_len < CMSG_LEN(len)) {
753 err = -EINVAL;
754 goto exit_f;
755 }
756 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
757 err = -EPERM;
758 goto exit_f;
759 }
760 if (opt->dst1opt) {
761 err = -EINVAL;
762 goto exit_f;
763 }
764 opt->opt_flen += len;
765 opt->dst1opt = hdr;
766 break;
767
768 case IPV6_DSTOPTS:
769 case IPV6_RTHDRDSTOPTS:
770 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
771 err = -EINVAL;
772 goto exit_f;
773 }
774
775 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
776 len = ((hdr->hdrlen + 1) << 3);
777 if (cmsg->cmsg_len < CMSG_LEN(len)) {
778 err = -EINVAL;
779 goto exit_f;
780 }
781 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
782 err = -EPERM;
783 goto exit_f;
784 }
785 if (cmsg->cmsg_type == IPV6_DSTOPTS) {
786 opt->opt_flen += len;
787 opt->dst1opt = hdr;
788 } else {
789 opt->opt_nflen += len;
790 opt->dst0opt = hdr;
791 }
792 break;
793
794 case IPV6_2292RTHDR:
795 case IPV6_RTHDR:
796 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
797 err = -EINVAL;
798 goto exit_f;
799 }
800
801 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
802
803 switch (rthdr->type) {
804 #if IS_ENABLED(CONFIG_IPV6_MIP6)
805 case IPV6_SRCRT_TYPE_2:
806 if (rthdr->hdrlen != 2 ||
807 rthdr->segments_left != 1) {
808 err = -EINVAL;
809 goto exit_f;
810 }
811 break;
812 #endif
813 default:
814 err = -EINVAL;
815 goto exit_f;
816 }
817
818 len = ((rthdr->hdrlen + 1) << 3);
819
820 if (cmsg->cmsg_len < CMSG_LEN(len)) {
821 err = -EINVAL;
822 goto exit_f;
823 }
824
825 /* segments left must also match */
826 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
827 err = -EINVAL;
828 goto exit_f;
829 }
830
831 opt->opt_nflen += len;
832 opt->srcrt = rthdr;
833
834 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
835 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
836
837 opt->opt_nflen += dsthdrlen;
838 opt->dst0opt = opt->dst1opt;
839 opt->dst1opt = NULL;
840 opt->opt_flen -= dsthdrlen;
841 }
842
843 break;
844
845 case IPV6_2292HOPLIMIT:
846 case IPV6_HOPLIMIT:
847 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
848 err = -EINVAL;
849 goto exit_f;
850 }
851
852 *hlimit = *(int *)CMSG_DATA(cmsg);
853 if (*hlimit < -1 || *hlimit > 0xff) {
854 err = -EINVAL;
855 goto exit_f;
856 }
857
858 break;
859
860 case IPV6_TCLASS:
861 {
862 int tc;
863
864 err = -EINVAL;
865 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
866 goto exit_f;
867
868 tc = *(int *)CMSG_DATA(cmsg);
869 if (tc < -1 || tc > 0xff)
870 goto exit_f;
871
872 err = 0;
873 *tclass = tc;
874
875 break;
876 }
877
878 case IPV6_DONTFRAG:
879 {
880 int df;
881
882 err = -EINVAL;
883 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
884 goto exit_f;
885
886 df = *(int *)CMSG_DATA(cmsg);
887 if (df < 0 || df > 1)
888 goto exit_f;
889
890 err = 0;
891 *dontfrag = df;
892
893 break;
894 }
895 default:
896 LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n",
897 cmsg->cmsg_type);
898 err = -EINVAL;
899 goto exit_f;
900 }
901 }
902
903 exit_f:
904 return err;
905 }
906 EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl);
907
908 void ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp,
909 __u16 srcp, __u16 destp, int bucket)
910 {
911 const struct in6_addr *dest, *src;
912
913 dest = &sp->sk_v6_daddr;
914 src = &sp->sk_v6_rcv_saddr;
915 seq_printf(seq,
916 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
917 "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n",
918 bucket,
919 src->s6_addr32[0], src->s6_addr32[1],
920 src->s6_addr32[2], src->s6_addr32[3], srcp,
921 dest->s6_addr32[0], dest->s6_addr32[1],
922 dest->s6_addr32[2], dest->s6_addr32[3], destp,
923 sp->sk_state,
924 sk_wmem_alloc_get(sp),
925 sk_rmem_alloc_get(sp),
926 0, 0L, 0,
927 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
928 0,
929 sock_i_ino(sp),
930 atomic_read(&sp->sk_refcnt), sp,
931 atomic_read(&sp->sk_drops));
932 }
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