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ipv6: Implement automatic flow label generation on transmit
[GitHub/LineageOS/android_kernel_motorola_exynos9610.git] / net / ipv6 / ipv6_sockglue.c
1 /*
2 * IPv6 BSD socket options interface
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * Based on linux/net/ipv4/ip_sockglue.c
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 *
15 * FIXME: Make the setsockopt code POSIX compliant: That is
16 *
17 * o Truncate getsockopt returns
18 * o Return an optlen of the truncated length if need be
19 *
20 * Changes:
21 * David L Stevens <dlstevens@us.ibm.com>:
22 * - added multicast source filtering API for MLDv2
23 */
24
25 #include <linux/module.h>
26 #include <linux/capability.h>
27 #include <linux/errno.h>
28 #include <linux/types.h>
29 #include <linux/socket.h>
30 #include <linux/sockios.h>
31 #include <linux/net.h>
32 #include <linux/in6.h>
33 #include <linux/mroute6.h>
34 #include <linux/netdevice.h>
35 #include <linux/if_arp.h>
36 #include <linux/init.h>
37 #include <linux/sysctl.h>
38 #include <linux/netfilter.h>
39 #include <linux/slab.h>
40
41 #include <net/sock.h>
42 #include <net/snmp.h>
43 #include <net/ipv6.h>
44 #include <net/ndisc.h>
45 #include <net/protocol.h>
46 #include <net/transp_v6.h>
47 #include <net/ip6_route.h>
48 #include <net/addrconf.h>
49 #include <net/inet_common.h>
50 #include <net/tcp.h>
51 #include <net/udp.h>
52 #include <net/udplite.h>
53 #include <net/xfrm.h>
54 #include <net/compat.h>
55
56 #include <asm/uaccess.h>
57
58 struct ip6_ra_chain *ip6_ra_chain;
59 DEFINE_RWLOCK(ip6_ra_lock);
60
61 int ip6_ra_control(struct sock *sk, int sel)
62 {
63 struct ip6_ra_chain *ra, *new_ra, **rap;
64
65 /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
66 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW)
67 return -ENOPROTOOPT;
68
69 new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
70
71 write_lock_bh(&ip6_ra_lock);
72 for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
73 if (ra->sk == sk) {
74 if (sel>=0) {
75 write_unlock_bh(&ip6_ra_lock);
76 kfree(new_ra);
77 return -EADDRINUSE;
78 }
79
80 *rap = ra->next;
81 write_unlock_bh(&ip6_ra_lock);
82
83 sock_put(sk);
84 kfree(ra);
85 return 0;
86 }
87 }
88 if (new_ra == NULL) {
89 write_unlock_bh(&ip6_ra_lock);
90 return -ENOBUFS;
91 }
92 new_ra->sk = sk;
93 new_ra->sel = sel;
94 new_ra->next = ra;
95 *rap = new_ra;
96 sock_hold(sk);
97 write_unlock_bh(&ip6_ra_lock);
98 return 0;
99 }
100
101 static
102 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
103 struct ipv6_txoptions *opt)
104 {
105 if (inet_sk(sk)->is_icsk) {
106 if (opt &&
107 !((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
108 inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) {
109 struct inet_connection_sock *icsk = inet_csk(sk);
110 icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
111 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
112 }
113 opt = xchg(&inet6_sk(sk)->opt, opt);
114 } else {
115 spin_lock(&sk->sk_dst_lock);
116 opt = xchg(&inet6_sk(sk)->opt, opt);
117 spin_unlock(&sk->sk_dst_lock);
118 }
119 sk_dst_reset(sk);
120
121 return opt;
122 }
123
124 static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
125 char __user *optval, unsigned int optlen)
126 {
127 struct ipv6_pinfo *np = inet6_sk(sk);
128 struct net *net = sock_net(sk);
129 int val, valbool;
130 int retv = -ENOPROTOOPT;
131
132 if (optval == NULL)
133 val=0;
134 else {
135 if (optlen >= sizeof(int)) {
136 if (get_user(val, (int __user *) optval))
137 return -EFAULT;
138 } else
139 val = 0;
140 }
141
142 valbool = (val!=0);
143
144 if (ip6_mroute_opt(optname))
145 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
146
147 lock_sock(sk);
148
149 switch (optname) {
150
151 case IPV6_ADDRFORM:
152 if (optlen < sizeof(int))
153 goto e_inval;
154 if (val == PF_INET) {
155 struct ipv6_txoptions *opt;
156 struct sk_buff *pktopt;
157
158 if (sk->sk_type == SOCK_RAW)
159 break;
160
161 if (sk->sk_protocol == IPPROTO_UDP ||
162 sk->sk_protocol == IPPROTO_UDPLITE) {
163 struct udp_sock *up = udp_sk(sk);
164 if (up->pending == AF_INET6) {
165 retv = -EBUSY;
166 break;
167 }
168 } else if (sk->sk_protocol != IPPROTO_TCP)
169 break;
170
171 if (sk->sk_state != TCP_ESTABLISHED) {
172 retv = -ENOTCONN;
173 break;
174 }
175
176 if (ipv6_only_sock(sk) ||
177 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
178 retv = -EADDRNOTAVAIL;
179 break;
180 }
181
182 fl6_free_socklist(sk);
183 ipv6_sock_mc_close(sk);
184
185 /*
186 * Sock is moving from IPv6 to IPv4 (sk_prot), so
187 * remove it from the refcnt debug socks count in the
188 * original family...
189 */
190 sk_refcnt_debug_dec(sk);
191
192 if (sk->sk_protocol == IPPROTO_TCP) {
193 struct inet_connection_sock *icsk = inet_csk(sk);
194 local_bh_disable();
195 sock_prot_inuse_add(net, sk->sk_prot, -1);
196 sock_prot_inuse_add(net, &tcp_prot, 1);
197 local_bh_enable();
198 sk->sk_prot = &tcp_prot;
199 icsk->icsk_af_ops = &ipv4_specific;
200 sk->sk_socket->ops = &inet_stream_ops;
201 sk->sk_family = PF_INET;
202 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
203 } else {
204 struct proto *prot = &udp_prot;
205
206 if (sk->sk_protocol == IPPROTO_UDPLITE)
207 prot = &udplite_prot;
208 local_bh_disable();
209 sock_prot_inuse_add(net, sk->sk_prot, -1);
210 sock_prot_inuse_add(net, prot, 1);
211 local_bh_enable();
212 sk->sk_prot = prot;
213 sk->sk_socket->ops = &inet_dgram_ops;
214 sk->sk_family = PF_INET;
215 }
216 opt = xchg(&np->opt, NULL);
217 if (opt)
218 sock_kfree_s(sk, opt, opt->tot_len);
219 pktopt = xchg(&np->pktoptions, NULL);
220 kfree_skb(pktopt);
221
222 sk->sk_destruct = inet_sock_destruct;
223 /*
224 * ... and add it to the refcnt debug socks count
225 * in the new family. -acme
226 */
227 sk_refcnt_debug_inc(sk);
228 module_put(THIS_MODULE);
229 retv = 0;
230 break;
231 }
232 goto e_inval;
233
234 case IPV6_V6ONLY:
235 if (optlen < sizeof(int) ||
236 inet_sk(sk)->inet_num)
237 goto e_inval;
238 sk->sk_ipv6only = valbool;
239 retv = 0;
240 break;
241
242 case IPV6_RECVPKTINFO:
243 if (optlen < sizeof(int))
244 goto e_inval;
245 np->rxopt.bits.rxinfo = valbool;
246 retv = 0;
247 break;
248
249 case IPV6_2292PKTINFO:
250 if (optlen < sizeof(int))
251 goto e_inval;
252 np->rxopt.bits.rxoinfo = valbool;
253 retv = 0;
254 break;
255
256 case IPV6_RECVHOPLIMIT:
257 if (optlen < sizeof(int))
258 goto e_inval;
259 np->rxopt.bits.rxhlim = valbool;
260 retv = 0;
261 break;
262
263 case IPV6_2292HOPLIMIT:
264 if (optlen < sizeof(int))
265 goto e_inval;
266 np->rxopt.bits.rxohlim = valbool;
267 retv = 0;
268 break;
269
270 case IPV6_RECVRTHDR:
271 if (optlen < sizeof(int))
272 goto e_inval;
273 np->rxopt.bits.srcrt = valbool;
274 retv = 0;
275 break;
276
277 case IPV6_2292RTHDR:
278 if (optlen < sizeof(int))
279 goto e_inval;
280 np->rxopt.bits.osrcrt = valbool;
281 retv = 0;
282 break;
283
284 case IPV6_RECVHOPOPTS:
285 if (optlen < sizeof(int))
286 goto e_inval;
287 np->rxopt.bits.hopopts = valbool;
288 retv = 0;
289 break;
290
291 case IPV6_2292HOPOPTS:
292 if (optlen < sizeof(int))
293 goto e_inval;
294 np->rxopt.bits.ohopopts = valbool;
295 retv = 0;
296 break;
297
298 case IPV6_RECVDSTOPTS:
299 if (optlen < sizeof(int))
300 goto e_inval;
301 np->rxopt.bits.dstopts = valbool;
302 retv = 0;
303 break;
304
305 case IPV6_2292DSTOPTS:
306 if (optlen < sizeof(int))
307 goto e_inval;
308 np->rxopt.bits.odstopts = valbool;
309 retv = 0;
310 break;
311
312 case IPV6_TCLASS:
313 if (optlen < sizeof(int))
314 goto e_inval;
315 if (val < -1 || val > 0xff)
316 goto e_inval;
317 /* RFC 3542, 6.5: default traffic class of 0x0 */
318 if (val == -1)
319 val = 0;
320 np->tclass = val;
321 retv = 0;
322 break;
323
324 case IPV6_RECVTCLASS:
325 if (optlen < sizeof(int))
326 goto e_inval;
327 np->rxopt.bits.rxtclass = valbool;
328 retv = 0;
329 break;
330
331 case IPV6_FLOWINFO:
332 if (optlen < sizeof(int))
333 goto e_inval;
334 np->rxopt.bits.rxflow = valbool;
335 retv = 0;
336 break;
337
338 case IPV6_RECVPATHMTU:
339 if (optlen < sizeof(int))
340 goto e_inval;
341 np->rxopt.bits.rxpmtu = valbool;
342 retv = 0;
343 break;
344
345 case IPV6_TRANSPARENT:
346 if (valbool && !ns_capable(net->user_ns, CAP_NET_ADMIN) &&
347 !ns_capable(net->user_ns, CAP_NET_RAW)) {
348 retv = -EPERM;
349 break;
350 }
351 if (optlen < sizeof(int))
352 goto e_inval;
353 /* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
354 inet_sk(sk)->transparent = valbool;
355 retv = 0;
356 break;
357
358 case IPV6_RECVORIGDSTADDR:
359 if (optlen < sizeof(int))
360 goto e_inval;
361 np->rxopt.bits.rxorigdstaddr = valbool;
362 retv = 0;
363 break;
364
365 case IPV6_HOPOPTS:
366 case IPV6_RTHDRDSTOPTS:
367 case IPV6_RTHDR:
368 case IPV6_DSTOPTS:
369 {
370 struct ipv6_txoptions *opt;
371
372 /* remove any sticky options header with a zero option
373 * length, per RFC3542.
374 */
375 if (optlen == 0)
376 optval = NULL;
377 else if (optval == NULL)
378 goto e_inval;
379 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
380 optlen & 0x7 || optlen > 8 * 255)
381 goto e_inval;
382
383 /* hop-by-hop / destination options are privileged option */
384 retv = -EPERM;
385 if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
386 break;
387
388 opt = ipv6_renew_options(sk, np->opt, optname,
389 (struct ipv6_opt_hdr __user *)optval,
390 optlen);
391 if (IS_ERR(opt)) {
392 retv = PTR_ERR(opt);
393 break;
394 }
395
396 /* routing header option needs extra check */
397 retv = -EINVAL;
398 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
399 struct ipv6_rt_hdr *rthdr = opt->srcrt;
400 switch (rthdr->type) {
401 #if IS_ENABLED(CONFIG_IPV6_MIP6)
402 case IPV6_SRCRT_TYPE_2:
403 if (rthdr->hdrlen != 2 ||
404 rthdr->segments_left != 1)
405 goto sticky_done;
406
407 break;
408 #endif
409 default:
410 goto sticky_done;
411 }
412 }
413
414 retv = 0;
415 opt = ipv6_update_options(sk, opt);
416 sticky_done:
417 if (opt)
418 sock_kfree_s(sk, opt, opt->tot_len);
419 break;
420 }
421
422 case IPV6_PKTINFO:
423 {
424 struct in6_pktinfo pkt;
425
426 if (optlen == 0)
427 goto e_inval;
428 else if (optlen < sizeof(struct in6_pktinfo) || optval == NULL)
429 goto e_inval;
430
431 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
432 retv = -EFAULT;
433 break;
434 }
435 if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
436 goto e_inval;
437
438 np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
439 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
440 retv = 0;
441 break;
442 }
443
444 case IPV6_2292PKTOPTIONS:
445 {
446 struct ipv6_txoptions *opt = NULL;
447 struct msghdr msg;
448 struct flowi6 fl6;
449 int junk;
450
451 memset(&fl6, 0, sizeof(fl6));
452 fl6.flowi6_oif = sk->sk_bound_dev_if;
453 fl6.flowi6_mark = sk->sk_mark;
454
455 if (optlen == 0)
456 goto update;
457
458 /* 1K is probably excessive
459 * 1K is surely not enough, 2K per standard header is 16K.
460 */
461 retv = -EINVAL;
462 if (optlen > 64*1024)
463 break;
464
465 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
466 retv = -ENOBUFS;
467 if (opt == NULL)
468 break;
469
470 memset(opt, 0, sizeof(*opt));
471 opt->tot_len = sizeof(*opt) + optlen;
472 retv = -EFAULT;
473 if (copy_from_user(opt+1, optval, optlen))
474 goto done;
475
476 msg.msg_controllen = optlen;
477 msg.msg_control = (void*)(opt+1);
478
479 retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, opt, &junk,
480 &junk, &junk);
481 if (retv)
482 goto done;
483 update:
484 retv = 0;
485 opt = ipv6_update_options(sk, opt);
486 done:
487 if (opt)
488 sock_kfree_s(sk, opt, opt->tot_len);
489 break;
490 }
491 case IPV6_UNICAST_HOPS:
492 if (optlen < sizeof(int))
493 goto e_inval;
494 if (val > 255 || val < -1)
495 goto e_inval;
496 np->hop_limit = val;
497 retv = 0;
498 break;
499
500 case IPV6_MULTICAST_HOPS:
501 if (sk->sk_type == SOCK_STREAM)
502 break;
503 if (optlen < sizeof(int))
504 goto e_inval;
505 if (val > 255 || val < -1)
506 goto e_inval;
507 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
508 retv = 0;
509 break;
510
511 case IPV6_MULTICAST_LOOP:
512 if (optlen < sizeof(int))
513 goto e_inval;
514 if (val != valbool)
515 goto e_inval;
516 np->mc_loop = valbool;
517 retv = 0;
518 break;
519
520 case IPV6_UNICAST_IF:
521 {
522 struct net_device *dev = NULL;
523 int ifindex;
524
525 if (optlen != sizeof(int))
526 goto e_inval;
527
528 ifindex = (__force int)ntohl((__force __be32)val);
529 if (ifindex == 0) {
530 np->ucast_oif = 0;
531 retv = 0;
532 break;
533 }
534
535 dev = dev_get_by_index(net, ifindex);
536 retv = -EADDRNOTAVAIL;
537 if (!dev)
538 break;
539 dev_put(dev);
540
541 retv = -EINVAL;
542 if (sk->sk_bound_dev_if)
543 break;
544
545 np->ucast_oif = ifindex;
546 retv = 0;
547 break;
548 }
549
550 case IPV6_MULTICAST_IF:
551 if (sk->sk_type == SOCK_STREAM)
552 break;
553 if (optlen < sizeof(int))
554 goto e_inval;
555
556 if (val) {
557 struct net_device *dev;
558
559 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
560 goto e_inval;
561
562 dev = dev_get_by_index(net, val);
563 if (!dev) {
564 retv = -ENODEV;
565 break;
566 }
567 dev_put(dev);
568 }
569 np->mcast_oif = val;
570 retv = 0;
571 break;
572 case IPV6_ADD_MEMBERSHIP:
573 case IPV6_DROP_MEMBERSHIP:
574 {
575 struct ipv6_mreq mreq;
576
577 if (optlen < sizeof(struct ipv6_mreq))
578 goto e_inval;
579
580 retv = -EPROTO;
581 if (inet_sk(sk)->is_icsk)
582 break;
583
584 retv = -EFAULT;
585 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
586 break;
587
588 if (optname == IPV6_ADD_MEMBERSHIP)
589 retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
590 else
591 retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
592 break;
593 }
594 case IPV6_JOIN_ANYCAST:
595 case IPV6_LEAVE_ANYCAST:
596 {
597 struct ipv6_mreq mreq;
598
599 if (optlen < sizeof(struct ipv6_mreq))
600 goto e_inval;
601
602 retv = -EFAULT;
603 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
604 break;
605
606 if (optname == IPV6_JOIN_ANYCAST)
607 retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
608 else
609 retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
610 break;
611 }
612 case MCAST_JOIN_GROUP:
613 case MCAST_LEAVE_GROUP:
614 {
615 struct group_req greq;
616 struct sockaddr_in6 *psin6;
617
618 if (optlen < sizeof(struct group_req))
619 goto e_inval;
620
621 retv = -EFAULT;
622 if (copy_from_user(&greq, optval, sizeof(struct group_req)))
623 break;
624 if (greq.gr_group.ss_family != AF_INET6) {
625 retv = -EADDRNOTAVAIL;
626 break;
627 }
628 psin6 = (struct sockaddr_in6 *)&greq.gr_group;
629 if (optname == MCAST_JOIN_GROUP)
630 retv = ipv6_sock_mc_join(sk, greq.gr_interface,
631 &psin6->sin6_addr);
632 else
633 retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
634 &psin6->sin6_addr);
635 break;
636 }
637 case MCAST_JOIN_SOURCE_GROUP:
638 case MCAST_LEAVE_SOURCE_GROUP:
639 case MCAST_BLOCK_SOURCE:
640 case MCAST_UNBLOCK_SOURCE:
641 {
642 struct group_source_req greqs;
643 int omode, add;
644
645 if (optlen < sizeof(struct group_source_req))
646 goto e_inval;
647 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
648 retv = -EFAULT;
649 break;
650 }
651 if (greqs.gsr_group.ss_family != AF_INET6 ||
652 greqs.gsr_source.ss_family != AF_INET6) {
653 retv = -EADDRNOTAVAIL;
654 break;
655 }
656 if (optname == MCAST_BLOCK_SOURCE) {
657 omode = MCAST_EXCLUDE;
658 add = 1;
659 } else if (optname == MCAST_UNBLOCK_SOURCE) {
660 omode = MCAST_EXCLUDE;
661 add = 0;
662 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
663 struct sockaddr_in6 *psin6;
664
665 psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
666 retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
667 &psin6->sin6_addr);
668 /* prior join w/ different source is ok */
669 if (retv && retv != -EADDRINUSE)
670 break;
671 omode = MCAST_INCLUDE;
672 add = 1;
673 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
674 omode = MCAST_INCLUDE;
675 add = 0;
676 }
677 retv = ip6_mc_source(add, omode, sk, &greqs);
678 break;
679 }
680 case MCAST_MSFILTER:
681 {
682 struct group_filter *gsf;
683
684 if (optlen < GROUP_FILTER_SIZE(0))
685 goto e_inval;
686 if (optlen > sysctl_optmem_max) {
687 retv = -ENOBUFS;
688 break;
689 }
690 gsf = kmalloc(optlen,GFP_KERNEL);
691 if (!gsf) {
692 retv = -ENOBUFS;
693 break;
694 }
695 retv = -EFAULT;
696 if (copy_from_user(gsf, optval, optlen)) {
697 kfree(gsf);
698 break;
699 }
700 /* numsrc >= (4G-140)/128 overflow in 32 bits */
701 if (gsf->gf_numsrc >= 0x1ffffffU ||
702 gsf->gf_numsrc > sysctl_mld_max_msf) {
703 kfree(gsf);
704 retv = -ENOBUFS;
705 break;
706 }
707 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
708 kfree(gsf);
709 retv = -EINVAL;
710 break;
711 }
712 retv = ip6_mc_msfilter(sk, gsf);
713 kfree(gsf);
714
715 break;
716 }
717 case IPV6_ROUTER_ALERT:
718 if (optlen < sizeof(int))
719 goto e_inval;
720 retv = ip6_ra_control(sk, val);
721 break;
722 case IPV6_MTU_DISCOVER:
723 if (optlen < sizeof(int))
724 goto e_inval;
725 if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
726 goto e_inval;
727 np->pmtudisc = val;
728 retv = 0;
729 break;
730 case IPV6_MTU:
731 if (optlen < sizeof(int))
732 goto e_inval;
733 if (val && val < IPV6_MIN_MTU)
734 goto e_inval;
735 np->frag_size = val;
736 retv = 0;
737 break;
738 case IPV6_RECVERR:
739 if (optlen < sizeof(int))
740 goto e_inval;
741 np->recverr = valbool;
742 if (!val)
743 skb_queue_purge(&sk->sk_error_queue);
744 retv = 0;
745 break;
746 case IPV6_FLOWINFO_SEND:
747 if (optlen < sizeof(int))
748 goto e_inval;
749 np->sndflow = valbool;
750 retv = 0;
751 break;
752 case IPV6_FLOWLABEL_MGR:
753 retv = ipv6_flowlabel_opt(sk, optval, optlen);
754 break;
755 case IPV6_IPSEC_POLICY:
756 case IPV6_XFRM_POLICY:
757 retv = -EPERM;
758 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
759 break;
760 retv = xfrm_user_policy(sk, optname, optval, optlen);
761 break;
762
763 case IPV6_ADDR_PREFERENCES:
764 {
765 unsigned int pref = 0;
766 unsigned int prefmask = ~0;
767
768 if (optlen < sizeof(int))
769 goto e_inval;
770
771 retv = -EINVAL;
772
773 /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
774 switch (val & (IPV6_PREFER_SRC_PUBLIC|
775 IPV6_PREFER_SRC_TMP|
776 IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
777 case IPV6_PREFER_SRC_PUBLIC:
778 pref |= IPV6_PREFER_SRC_PUBLIC;
779 break;
780 case IPV6_PREFER_SRC_TMP:
781 pref |= IPV6_PREFER_SRC_TMP;
782 break;
783 case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
784 break;
785 case 0:
786 goto pref_skip_pubtmp;
787 default:
788 goto e_inval;
789 }
790
791 prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
792 IPV6_PREFER_SRC_TMP);
793 pref_skip_pubtmp:
794
795 /* check HOME/COA conflicts */
796 switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
797 case IPV6_PREFER_SRC_HOME:
798 break;
799 case IPV6_PREFER_SRC_COA:
800 pref |= IPV6_PREFER_SRC_COA;
801 case 0:
802 goto pref_skip_coa;
803 default:
804 goto e_inval;
805 }
806
807 prefmask &= ~IPV6_PREFER_SRC_COA;
808 pref_skip_coa:
809
810 /* check CGA/NONCGA conflicts */
811 switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
812 case IPV6_PREFER_SRC_CGA:
813 case IPV6_PREFER_SRC_NONCGA:
814 case 0:
815 break;
816 default:
817 goto e_inval;
818 }
819
820 np->srcprefs = (np->srcprefs & prefmask) | pref;
821 retv = 0;
822
823 break;
824 }
825 case IPV6_MINHOPCOUNT:
826 if (optlen < sizeof(int))
827 goto e_inval;
828 if (val < 0 || val > 255)
829 goto e_inval;
830 np->min_hopcount = val;
831 retv = 0;
832 break;
833 case IPV6_DONTFRAG:
834 np->dontfrag = valbool;
835 retv = 0;
836 break;
837 case IPV6_AUTOFLOWLABEL:
838 np->autoflowlabel = valbool;
839 retv = 0;
840 break;
841 }
842
843 release_sock(sk);
844
845 return retv;
846
847 e_inval:
848 release_sock(sk);
849 return -EINVAL;
850 }
851
852 int ipv6_setsockopt(struct sock *sk, int level, int optname,
853 char __user *optval, unsigned int optlen)
854 {
855 int err;
856
857 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
858 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
859
860 if (level != SOL_IPV6)
861 return -ENOPROTOOPT;
862
863 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
864 #ifdef CONFIG_NETFILTER
865 /* we need to exclude all possible ENOPROTOOPTs except default case */
866 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
867 optname != IPV6_XFRM_POLICY) {
868 lock_sock(sk);
869 err = nf_setsockopt(sk, PF_INET6, optname, optval,
870 optlen);
871 release_sock(sk);
872 }
873 #endif
874 return err;
875 }
876
877 EXPORT_SYMBOL(ipv6_setsockopt);
878
879 #ifdef CONFIG_COMPAT
880 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
881 char __user *optval, unsigned int optlen)
882 {
883 int err;
884
885 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
886 if (udp_prot.compat_setsockopt != NULL)
887 return udp_prot.compat_setsockopt(sk, level, optname,
888 optval, optlen);
889 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
890 }
891
892 if (level != SOL_IPV6)
893 return -ENOPROTOOPT;
894
895 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
896 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
897 ipv6_setsockopt);
898
899 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
900 #ifdef CONFIG_NETFILTER
901 /* we need to exclude all possible ENOPROTOOPTs except default case */
902 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
903 optname != IPV6_XFRM_POLICY) {
904 lock_sock(sk);
905 err = compat_nf_setsockopt(sk, PF_INET6, optname,
906 optval, optlen);
907 release_sock(sk);
908 }
909 #endif
910 return err;
911 }
912
913 EXPORT_SYMBOL(compat_ipv6_setsockopt);
914 #endif
915
916 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
917 int optname, char __user *optval, int len)
918 {
919 struct ipv6_opt_hdr *hdr;
920
921 if (!opt)
922 return 0;
923
924 switch(optname) {
925 case IPV6_HOPOPTS:
926 hdr = opt->hopopt;
927 break;
928 case IPV6_RTHDRDSTOPTS:
929 hdr = opt->dst0opt;
930 break;
931 case IPV6_RTHDR:
932 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
933 break;
934 case IPV6_DSTOPTS:
935 hdr = opt->dst1opt;
936 break;
937 default:
938 return -EINVAL; /* should not happen */
939 }
940
941 if (!hdr)
942 return 0;
943
944 len = min_t(unsigned int, len, ipv6_optlen(hdr));
945 if (copy_to_user(optval, hdr, len))
946 return -EFAULT;
947 return len;
948 }
949
950 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
951 char __user *optval, int __user *optlen, unsigned int flags)
952 {
953 struct ipv6_pinfo *np = inet6_sk(sk);
954 int len;
955 int val;
956
957 if (ip6_mroute_opt(optname))
958 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
959
960 if (get_user(len, optlen))
961 return -EFAULT;
962 switch (optname) {
963 case IPV6_ADDRFORM:
964 if (sk->sk_protocol != IPPROTO_UDP &&
965 sk->sk_protocol != IPPROTO_UDPLITE &&
966 sk->sk_protocol != IPPROTO_TCP)
967 return -ENOPROTOOPT;
968 if (sk->sk_state != TCP_ESTABLISHED)
969 return -ENOTCONN;
970 val = sk->sk_family;
971 break;
972 case MCAST_MSFILTER:
973 {
974 struct group_filter gsf;
975 int err;
976
977 if (len < GROUP_FILTER_SIZE(0))
978 return -EINVAL;
979 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
980 return -EFAULT;
981 if (gsf.gf_group.ss_family != AF_INET6)
982 return -EADDRNOTAVAIL;
983 lock_sock(sk);
984 err = ip6_mc_msfget(sk, &gsf,
985 (struct group_filter __user *)optval, optlen);
986 release_sock(sk);
987 return err;
988 }
989
990 case IPV6_2292PKTOPTIONS:
991 {
992 struct msghdr msg;
993 struct sk_buff *skb;
994
995 if (sk->sk_type != SOCK_STREAM)
996 return -ENOPROTOOPT;
997
998 msg.msg_control = optval;
999 msg.msg_controllen = len;
1000 msg.msg_flags = flags;
1001
1002 lock_sock(sk);
1003 skb = np->pktoptions;
1004 if (skb)
1005 atomic_inc(&skb->users);
1006 release_sock(sk);
1007
1008 if (skb) {
1009 ip6_datagram_recv_ctl(sk, &msg, skb);
1010 kfree_skb(skb);
1011 } else {
1012 if (np->rxopt.bits.rxinfo) {
1013 struct in6_pktinfo src_info;
1014 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1015 np->sticky_pktinfo.ipi6_ifindex;
1016 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
1017 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1018 }
1019 if (np->rxopt.bits.rxhlim) {
1020 int hlim = np->mcast_hops;
1021 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1022 }
1023 if (np->rxopt.bits.rxtclass) {
1024 int tclass = (int)ip6_tclass(np->rcv_flowinfo);
1025
1026 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1027 }
1028 if (np->rxopt.bits.rxoinfo) {
1029 struct in6_pktinfo src_info;
1030 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1031 np->sticky_pktinfo.ipi6_ifindex;
1032 src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
1033 np->sticky_pktinfo.ipi6_addr;
1034 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1035 }
1036 if (np->rxopt.bits.rxohlim) {
1037 int hlim = np->mcast_hops;
1038 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1039 }
1040 if (np->rxopt.bits.rxflow) {
1041 __be32 flowinfo = np->rcv_flowinfo;
1042
1043 put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
1044 }
1045 }
1046 len -= msg.msg_controllen;
1047 return put_user(len, optlen);
1048 }
1049 case IPV6_MTU:
1050 {
1051 struct dst_entry *dst;
1052
1053 val = 0;
1054 rcu_read_lock();
1055 dst = __sk_dst_get(sk);
1056 if (dst)
1057 val = dst_mtu(dst);
1058 rcu_read_unlock();
1059 if (!val)
1060 return -ENOTCONN;
1061 break;
1062 }
1063
1064 case IPV6_V6ONLY:
1065 val = sk->sk_ipv6only;
1066 break;
1067
1068 case IPV6_RECVPKTINFO:
1069 val = np->rxopt.bits.rxinfo;
1070 break;
1071
1072 case IPV6_2292PKTINFO:
1073 val = np->rxopt.bits.rxoinfo;
1074 break;
1075
1076 case IPV6_RECVHOPLIMIT:
1077 val = np->rxopt.bits.rxhlim;
1078 break;
1079
1080 case IPV6_2292HOPLIMIT:
1081 val = np->rxopt.bits.rxohlim;
1082 break;
1083
1084 case IPV6_RECVRTHDR:
1085 val = np->rxopt.bits.srcrt;
1086 break;
1087
1088 case IPV6_2292RTHDR:
1089 val = np->rxopt.bits.osrcrt;
1090 break;
1091
1092 case IPV6_HOPOPTS:
1093 case IPV6_RTHDRDSTOPTS:
1094 case IPV6_RTHDR:
1095 case IPV6_DSTOPTS:
1096 {
1097
1098 lock_sock(sk);
1099 len = ipv6_getsockopt_sticky(sk, np->opt,
1100 optname, optval, len);
1101 release_sock(sk);
1102 /* check if ipv6_getsockopt_sticky() returns err code */
1103 if (len < 0)
1104 return len;
1105 return put_user(len, optlen);
1106 }
1107
1108 case IPV6_RECVHOPOPTS:
1109 val = np->rxopt.bits.hopopts;
1110 break;
1111
1112 case IPV6_2292HOPOPTS:
1113 val = np->rxopt.bits.ohopopts;
1114 break;
1115
1116 case IPV6_RECVDSTOPTS:
1117 val = np->rxopt.bits.dstopts;
1118 break;
1119
1120 case IPV6_2292DSTOPTS:
1121 val = np->rxopt.bits.odstopts;
1122 break;
1123
1124 case IPV6_TCLASS:
1125 val = np->tclass;
1126 break;
1127
1128 case IPV6_RECVTCLASS:
1129 val = np->rxopt.bits.rxtclass;
1130 break;
1131
1132 case IPV6_FLOWINFO:
1133 val = np->rxopt.bits.rxflow;
1134 break;
1135
1136 case IPV6_RECVPATHMTU:
1137 val = np->rxopt.bits.rxpmtu;
1138 break;
1139
1140 case IPV6_PATHMTU:
1141 {
1142 struct dst_entry *dst;
1143 struct ip6_mtuinfo mtuinfo;
1144
1145 if (len < sizeof(mtuinfo))
1146 return -EINVAL;
1147
1148 len = sizeof(mtuinfo);
1149 memset(&mtuinfo, 0, sizeof(mtuinfo));
1150
1151 rcu_read_lock();
1152 dst = __sk_dst_get(sk);
1153 if (dst)
1154 mtuinfo.ip6m_mtu = dst_mtu(dst);
1155 rcu_read_unlock();
1156 if (!mtuinfo.ip6m_mtu)
1157 return -ENOTCONN;
1158
1159 if (put_user(len, optlen))
1160 return -EFAULT;
1161 if (copy_to_user(optval, &mtuinfo, len))
1162 return -EFAULT;
1163
1164 return 0;
1165 break;
1166 }
1167
1168 case IPV6_TRANSPARENT:
1169 val = inet_sk(sk)->transparent;
1170 break;
1171
1172 case IPV6_RECVORIGDSTADDR:
1173 val = np->rxopt.bits.rxorigdstaddr;
1174 break;
1175
1176 case IPV6_UNICAST_HOPS:
1177 case IPV6_MULTICAST_HOPS:
1178 {
1179 struct dst_entry *dst;
1180
1181 if (optname == IPV6_UNICAST_HOPS)
1182 val = np->hop_limit;
1183 else
1184 val = np->mcast_hops;
1185
1186 if (val < 0) {
1187 rcu_read_lock();
1188 dst = __sk_dst_get(sk);
1189 if (dst)
1190 val = ip6_dst_hoplimit(dst);
1191 rcu_read_unlock();
1192 }
1193
1194 if (val < 0)
1195 val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1196 break;
1197 }
1198
1199 case IPV6_MULTICAST_LOOP:
1200 val = np->mc_loop;
1201 break;
1202
1203 case IPV6_MULTICAST_IF:
1204 val = np->mcast_oif;
1205 break;
1206
1207 case IPV6_UNICAST_IF:
1208 val = (__force int)htonl((__u32) np->ucast_oif);
1209 break;
1210
1211 case IPV6_MTU_DISCOVER:
1212 val = np->pmtudisc;
1213 break;
1214
1215 case IPV6_RECVERR:
1216 val = np->recverr;
1217 break;
1218
1219 case IPV6_FLOWINFO_SEND:
1220 val = np->sndflow;
1221 break;
1222
1223 case IPV6_FLOWLABEL_MGR:
1224 {
1225 struct in6_flowlabel_req freq;
1226 int flags;
1227
1228 if (len < sizeof(freq))
1229 return -EINVAL;
1230
1231 if (copy_from_user(&freq, optval, sizeof(freq)))
1232 return -EFAULT;
1233
1234 if (freq.flr_action != IPV6_FL_A_GET)
1235 return -EINVAL;
1236
1237 len = sizeof(freq);
1238 flags = freq.flr_flags;
1239
1240 memset(&freq, 0, sizeof(freq));
1241
1242 val = ipv6_flowlabel_opt_get(sk, &freq, flags);
1243 if (val < 0)
1244 return val;
1245
1246 if (put_user(len, optlen))
1247 return -EFAULT;
1248 if (copy_to_user(optval, &freq, len))
1249 return -EFAULT;
1250
1251 return 0;
1252 }
1253
1254 case IPV6_ADDR_PREFERENCES:
1255 val = 0;
1256
1257 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1258 val |= IPV6_PREFER_SRC_TMP;
1259 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1260 val |= IPV6_PREFER_SRC_PUBLIC;
1261 else {
1262 /* XXX: should we return system default? */
1263 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1264 }
1265
1266 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1267 val |= IPV6_PREFER_SRC_COA;
1268 else
1269 val |= IPV6_PREFER_SRC_HOME;
1270 break;
1271
1272 case IPV6_MINHOPCOUNT:
1273 val = np->min_hopcount;
1274 break;
1275
1276 case IPV6_DONTFRAG:
1277 val = np->dontfrag;
1278 break;
1279
1280 case IPV6_AUTOFLOWLABEL:
1281 val = np->autoflowlabel;
1282 break;
1283
1284 default:
1285 return -ENOPROTOOPT;
1286 }
1287 len = min_t(unsigned int, sizeof(int), len);
1288 if(put_user(len, optlen))
1289 return -EFAULT;
1290 if(copy_to_user(optval,&val,len))
1291 return -EFAULT;
1292 return 0;
1293 }
1294
1295 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1296 char __user *optval, int __user *optlen)
1297 {
1298 int err;
1299
1300 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1301 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1302
1303 if(level != SOL_IPV6)
1304 return -ENOPROTOOPT;
1305
1306 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
1307 #ifdef CONFIG_NETFILTER
1308 /* we need to exclude all possible ENOPROTOOPTs except default case */
1309 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1310 int len;
1311
1312 if (get_user(len, optlen))
1313 return -EFAULT;
1314
1315 lock_sock(sk);
1316 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1317 &len);
1318 release_sock(sk);
1319 if (err >= 0)
1320 err = put_user(len, optlen);
1321 }
1322 #endif
1323 return err;
1324 }
1325
1326 EXPORT_SYMBOL(ipv6_getsockopt);
1327
1328 #ifdef CONFIG_COMPAT
1329 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1330 char __user *optval, int __user *optlen)
1331 {
1332 int err;
1333
1334 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1335 if (udp_prot.compat_getsockopt != NULL)
1336 return udp_prot.compat_getsockopt(sk, level, optname,
1337 optval, optlen);
1338 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1339 }
1340
1341 if (level != SOL_IPV6)
1342 return -ENOPROTOOPT;
1343
1344 if (optname == MCAST_MSFILTER)
1345 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1346 ipv6_getsockopt);
1347
1348 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
1349 MSG_CMSG_COMPAT);
1350 #ifdef CONFIG_NETFILTER
1351 /* we need to exclude all possible ENOPROTOOPTs except default case */
1352 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1353 int len;
1354
1355 if (get_user(len, optlen))
1356 return -EFAULT;
1357
1358 lock_sock(sk);
1359 err = compat_nf_getsockopt(sk, PF_INET6,
1360 optname, optval, &len);
1361 release_sock(sk);
1362 if (err >= 0)
1363 err = put_user(len, optlen);
1364 }
1365 #endif
1366 return err;
1367 }
1368
1369 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1370 #endif
1371