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 
ip6_ra_control(struct sock * sk,int sel)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
ipv6_update_options(struct sock * sk,struct ipv6_txoptions * opt)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 
do_ipv6_setsockopt(struct sock * sk,int level,int optname,char __user * optval,unsigned int optlen)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(&np->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 		np->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 (!capable(CAP_NET_ADMIN)) {
347 			retv = -EPERM;
348 			break;
349 		}
350 		if (optlen < sizeof(int))
351 			goto e_inval;
352 		/* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
353 		inet_sk(sk)->transparent = valbool;
354 		retv = 0;
355 		break;
356 
357 	case IPV6_RECVORIGDSTADDR:
358 		if (optlen < sizeof(int))
359 			goto e_inval;
360 		np->rxopt.bits.rxorigdstaddr = valbool;
361 		retv = 0;
362 		break;
363 
364 	case IPV6_HOPOPTS:
365 	case IPV6_RTHDRDSTOPTS:
366 	case IPV6_RTHDR:
367 	case IPV6_DSTOPTS:
368 	{
369 		struct ipv6_txoptions *opt;
370 
371 		/* remove any sticky options header with a zero option
372 		 * length, per RFC3542.
373 		 */
374 		if (optlen == 0)
375 			optval = NULL;
376 		else if (optval == NULL)
377 			goto e_inval;
378 		else if (optlen < sizeof(struct ipv6_opt_hdr) ||
379 			 optlen & 0x7 || optlen > 8 * 255)
380 			goto e_inval;
381 
382 		/* hop-by-hop / destination options are privileged option */
383 		retv = -EPERM;
384 		if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
385 			break;
386 
387 		opt = ipv6_renew_options(sk, np->opt, optname,
388 					 (struct ipv6_opt_hdr __user *)optval,
389 					 optlen);
390 		if (IS_ERR(opt)) {
391 			retv = PTR_ERR(opt);
392 			break;
393 		}
394 
395 		/* routing header option needs extra check */
396 		retv = -EINVAL;
397 		if (optname == IPV6_RTHDR && opt && opt->srcrt) {
398 			struct ipv6_rt_hdr *rthdr = opt->srcrt;
399 			switch (rthdr->type) {
400 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
401 			case IPV6_SRCRT_TYPE_2:
402 				if (rthdr->hdrlen != 2 ||
403 				    rthdr->segments_left != 1)
404 					goto sticky_done;
405 
406 				break;
407 #endif
408 			default:
409 				goto sticky_done;
410 			}
411 		}
412 
413 		retv = 0;
414 		opt = ipv6_update_options(sk, opt);
415 sticky_done:
416 		if (opt)
417 			sock_kfree_s(sk, opt, opt->tot_len);
418 		break;
419 	}
420 
421 	case IPV6_PKTINFO:
422 	{
423 		struct in6_pktinfo pkt;
424 
425 		if (optlen == 0)
426 			goto e_inval;
427 		else if (optlen < sizeof(struct in6_pktinfo) || optval == NULL)
428 			goto e_inval;
429 
430 		if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
431 				retv = -EFAULT;
432 				break;
433 		}
434 		if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
435 			goto e_inval;
436 
437 		np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
438 		ipv6_addr_copy(&np->sticky_pktinfo.ipi6_addr, &pkt.ipi6_addr);
439 		retv = 0;
440 		break;
441 	}
442 
443 	case IPV6_2292PKTOPTIONS:
444 	{
445 		struct ipv6_txoptions *opt = NULL;
446 		struct msghdr msg;
447 		struct flowi6 fl6;
448 		int junk;
449 
450 		memset(&fl6, 0, sizeof(fl6));
451 		fl6.flowi6_oif = sk->sk_bound_dev_if;
452 		fl6.flowi6_mark = sk->sk_mark;
453 
454 		if (optlen == 0)
455 			goto update;
456 
457 		/* 1K is probably excessive
458 		 * 1K is surely not enough, 2K per standard header is 16K.
459 		 */
460 		retv = -EINVAL;
461 		if (optlen > 64*1024)
462 			break;
463 
464 		opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
465 		retv = -ENOBUFS;
466 		if (opt == NULL)
467 			break;
468 
469 		memset(opt, 0, sizeof(*opt));
470 		opt->tot_len = sizeof(*opt) + optlen;
471 		retv = -EFAULT;
472 		if (copy_from_user(opt+1, optval, optlen))
473 			goto done;
474 
475 		msg.msg_controllen = optlen;
476 		msg.msg_control = (void*)(opt+1);
477 
478 		retv = datagram_send_ctl(net, &msg, &fl6, opt, &junk, &junk,
479 					 &junk);
480 		if (retv)
481 			goto done;
482 update:
483 		retv = 0;
484 		opt = ipv6_update_options(sk, opt);
485 done:
486 		if (opt)
487 			sock_kfree_s(sk, opt, opt->tot_len);
488 		break;
489 	}
490 	case IPV6_UNICAST_HOPS:
491 		if (optlen < sizeof(int))
492 			goto e_inval;
493 		if (val > 255 || val < -1)
494 			goto e_inval;
495 		np->hop_limit = val;
496 		retv = 0;
497 		break;
498 
499 	case IPV6_MULTICAST_HOPS:
500 		if (sk->sk_type == SOCK_STREAM)
501 			break;
502 		if (optlen < sizeof(int))
503 			goto e_inval;
504 		if (val > 255 || val < -1)
505 			goto e_inval;
506 		np->mcast_hops = val;
507 		retv = 0;
508 		break;
509 
510 	case IPV6_MULTICAST_LOOP:
511 		if (optlen < sizeof(int))
512 			goto e_inval;
513 		if (val != valbool)
514 			goto e_inval;
515 		np->mc_loop = valbool;
516 		retv = 0;
517 		break;
518 
519 	case IPV6_MULTICAST_IF:
520 		if (sk->sk_type == SOCK_STREAM)
521 			break;
522 		if (optlen < sizeof(int))
523 			goto e_inval;
524 
525 		if (val) {
526 			struct net_device *dev;
527 
528 			if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
529 				goto e_inval;
530 
531 			dev = dev_get_by_index(net, val);
532 			if (!dev) {
533 				retv = -ENODEV;
534 				break;
535 			}
536 			dev_put(dev);
537 		}
538 		np->mcast_oif = val;
539 		retv = 0;
540 		break;
541 	case IPV6_ADD_MEMBERSHIP:
542 	case IPV6_DROP_MEMBERSHIP:
543 	{
544 		struct ipv6_mreq mreq;
545 
546 		if (optlen < sizeof(struct ipv6_mreq))
547 			goto e_inval;
548 
549 		retv = -EPROTO;
550 		if (inet_sk(sk)->is_icsk)
551 			break;
552 
553 		retv = -EFAULT;
554 		if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
555 			break;
556 
557 		if (optname == IPV6_ADD_MEMBERSHIP)
558 			retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
559 		else
560 			retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
561 		break;
562 	}
563 	case IPV6_JOIN_ANYCAST:
564 	case IPV6_LEAVE_ANYCAST:
565 	{
566 		struct ipv6_mreq mreq;
567 
568 		if (optlen < sizeof(struct ipv6_mreq))
569 			goto e_inval;
570 
571 		retv = -EFAULT;
572 		if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
573 			break;
574 
575 		if (optname == IPV6_JOIN_ANYCAST)
576 			retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
577 		else
578 			retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
579 		break;
580 	}
581 	case MCAST_JOIN_GROUP:
582 	case MCAST_LEAVE_GROUP:
583 	{
584 		struct group_req greq;
585 		struct sockaddr_in6 *psin6;
586 
587 		if (optlen < sizeof(struct group_req))
588 			goto e_inval;
589 
590 		retv = -EFAULT;
591 		if (copy_from_user(&greq, optval, sizeof(struct group_req)))
592 			break;
593 		if (greq.gr_group.ss_family != AF_INET6) {
594 			retv = -EADDRNOTAVAIL;
595 			break;
596 		}
597 		psin6 = (struct sockaddr_in6 *)&greq.gr_group;
598 		if (optname == MCAST_JOIN_GROUP)
599 			retv = ipv6_sock_mc_join(sk, greq.gr_interface,
600 				&psin6->sin6_addr);
601 		else
602 			retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
603 				&psin6->sin6_addr);
604 		break;
605 	}
606 	case MCAST_JOIN_SOURCE_GROUP:
607 	case MCAST_LEAVE_SOURCE_GROUP:
608 	case MCAST_BLOCK_SOURCE:
609 	case MCAST_UNBLOCK_SOURCE:
610 	{
611 		struct group_source_req greqs;
612 		int omode, add;
613 
614 		if (optlen < sizeof(struct group_source_req))
615 			goto e_inval;
616 		if (copy_from_user(&greqs, optval, sizeof(greqs))) {
617 			retv = -EFAULT;
618 			break;
619 		}
620 		if (greqs.gsr_group.ss_family != AF_INET6 ||
621 		    greqs.gsr_source.ss_family != AF_INET6) {
622 			retv = -EADDRNOTAVAIL;
623 			break;
624 		}
625 		if (optname == MCAST_BLOCK_SOURCE) {
626 			omode = MCAST_EXCLUDE;
627 			add = 1;
628 		} else if (optname == MCAST_UNBLOCK_SOURCE) {
629 			omode = MCAST_EXCLUDE;
630 			add = 0;
631 		} else if (optname == MCAST_JOIN_SOURCE_GROUP) {
632 			struct sockaddr_in6 *psin6;
633 
634 			psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
635 			retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
636 				&psin6->sin6_addr);
637 			/* prior join w/ different source is ok */
638 			if (retv && retv != -EADDRINUSE)
639 				break;
640 			omode = MCAST_INCLUDE;
641 			add = 1;
642 		} else /* MCAST_LEAVE_SOURCE_GROUP */ {
643 			omode = MCAST_INCLUDE;
644 			add = 0;
645 		}
646 		retv = ip6_mc_source(add, omode, sk, &greqs);
647 		break;
648 	}
649 	case MCAST_MSFILTER:
650 	{
651 		extern int sysctl_mld_max_msf;
652 		struct group_filter *gsf;
653 
654 		if (optlen < GROUP_FILTER_SIZE(0))
655 			goto e_inval;
656 		if (optlen > sysctl_optmem_max) {
657 			retv = -ENOBUFS;
658 			break;
659 		}
660 		gsf = kmalloc(optlen,GFP_KERNEL);
661 		if (!gsf) {
662 			retv = -ENOBUFS;
663 			break;
664 		}
665 		retv = -EFAULT;
666 		if (copy_from_user(gsf, optval, optlen)) {
667 			kfree(gsf);
668 			break;
669 		}
670 		/* numsrc >= (4G-140)/128 overflow in 32 bits */
671 		if (gsf->gf_numsrc >= 0x1ffffffU ||
672 		    gsf->gf_numsrc > sysctl_mld_max_msf) {
673 			kfree(gsf);
674 			retv = -ENOBUFS;
675 			break;
676 		}
677 		if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
678 			kfree(gsf);
679 			retv = -EINVAL;
680 			break;
681 		}
682 		retv = ip6_mc_msfilter(sk, gsf);
683 		kfree(gsf);
684 
685 		break;
686 	}
687 	case IPV6_ROUTER_ALERT:
688 		if (optlen < sizeof(int))
689 			goto e_inval;
690 		retv = ip6_ra_control(sk, val);
691 		break;
692 	case IPV6_MTU_DISCOVER:
693 		if (optlen < sizeof(int))
694 			goto e_inval;
695 		if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_PROBE)
696 			goto e_inval;
697 		np->pmtudisc = val;
698 		retv = 0;
699 		break;
700 	case IPV6_MTU:
701 		if (optlen < sizeof(int))
702 			goto e_inval;
703 		if (val && val < IPV6_MIN_MTU)
704 			goto e_inval;
705 		np->frag_size = val;
706 		retv = 0;
707 		break;
708 	case IPV6_RECVERR:
709 		if (optlen < sizeof(int))
710 			goto e_inval;
711 		np->recverr = valbool;
712 		if (!val)
713 			skb_queue_purge(&sk->sk_error_queue);
714 		retv = 0;
715 		break;
716 	case IPV6_FLOWINFO_SEND:
717 		if (optlen < sizeof(int))
718 			goto e_inval;
719 		np->sndflow = valbool;
720 		retv = 0;
721 		break;
722 	case IPV6_FLOWLABEL_MGR:
723 		retv = ipv6_flowlabel_opt(sk, optval, optlen);
724 		break;
725 	case IPV6_IPSEC_POLICY:
726 	case IPV6_XFRM_POLICY:
727 		retv = -EPERM;
728 		if (!capable(CAP_NET_ADMIN))
729 			break;
730 		retv = xfrm_user_policy(sk, optname, optval, optlen);
731 		break;
732 
733 	case IPV6_ADDR_PREFERENCES:
734 	    {
735 		unsigned int pref = 0;
736 		unsigned int prefmask = ~0;
737 
738 		if (optlen < sizeof(int))
739 			goto e_inval;
740 
741 		retv = -EINVAL;
742 
743 		/* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
744 		switch (val & (IPV6_PREFER_SRC_PUBLIC|
745 			       IPV6_PREFER_SRC_TMP|
746 			       IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
747 		case IPV6_PREFER_SRC_PUBLIC:
748 			pref |= IPV6_PREFER_SRC_PUBLIC;
749 			break;
750 		case IPV6_PREFER_SRC_TMP:
751 			pref |= IPV6_PREFER_SRC_TMP;
752 			break;
753 		case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
754 			break;
755 		case 0:
756 			goto pref_skip_pubtmp;
757 		default:
758 			goto e_inval;
759 		}
760 
761 		prefmask &= ~(IPV6_PREFER_SRC_PUBLIC|
762 			      IPV6_PREFER_SRC_TMP);
763 pref_skip_pubtmp:
764 
765 		/* check HOME/COA conflicts */
766 		switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) {
767 		case IPV6_PREFER_SRC_HOME:
768 			break;
769 		case IPV6_PREFER_SRC_COA:
770 			pref |= IPV6_PREFER_SRC_COA;
771 		case 0:
772 			goto pref_skip_coa;
773 		default:
774 			goto e_inval;
775 		}
776 
777 		prefmask &= ~IPV6_PREFER_SRC_COA;
778 pref_skip_coa:
779 
780 		/* check CGA/NONCGA conflicts */
781 		switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
782 		case IPV6_PREFER_SRC_CGA:
783 		case IPV6_PREFER_SRC_NONCGA:
784 		case 0:
785 			break;
786 		default:
787 			goto e_inval;
788 		}
789 
790 		np->srcprefs = (np->srcprefs & prefmask) | pref;
791 		retv = 0;
792 
793 		break;
794 	    }
795 	case IPV6_MINHOPCOUNT:
796 		if (optlen < sizeof(int))
797 			goto e_inval;
798 		if (val < 0 || val > 255)
799 			goto e_inval;
800 		np->min_hopcount = val;
801 		break;
802 	case IPV6_DONTFRAG:
803 		np->dontfrag = valbool;
804 		retv = 0;
805 		break;
806 	}
807 
808 	release_sock(sk);
809 
810 	return retv;
811 
812 e_inval:
813 	release_sock(sk);
814 	return -EINVAL;
815 }
816 
ipv6_setsockopt(struct sock * sk,int level,int optname,char __user * optval,unsigned int optlen)817 int ipv6_setsockopt(struct sock *sk, int level, int optname,
818 		    char __user *optval, unsigned int optlen)
819 {
820 	int err;
821 
822 	if (level == SOL_IP && sk->sk_type != SOCK_RAW)
823 		return udp_prot.setsockopt(sk, level, optname, optval, optlen);
824 
825 	if (level != SOL_IPV6)
826 		return -ENOPROTOOPT;
827 
828 	err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
829 #ifdef CONFIG_NETFILTER
830 	/* we need to exclude all possible ENOPROTOOPTs except default case */
831 	if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
832 			optname != IPV6_XFRM_POLICY) {
833 		lock_sock(sk);
834 		err = nf_setsockopt(sk, PF_INET6, optname, optval,
835 				optlen);
836 		release_sock(sk);
837 	}
838 #endif
839 	return err;
840 }
841 
842 EXPORT_SYMBOL(ipv6_setsockopt);
843 
844 #ifdef CONFIG_COMPAT
compat_ipv6_setsockopt(struct sock * sk,int level,int optname,char __user * optval,unsigned int optlen)845 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
846 			   char __user *optval, unsigned int optlen)
847 {
848 	int err;
849 
850 	if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
851 		if (udp_prot.compat_setsockopt != NULL)
852 			return udp_prot.compat_setsockopt(sk, level, optname,
853 							  optval, optlen);
854 		return udp_prot.setsockopt(sk, level, optname, optval, optlen);
855 	}
856 
857 	if (level != SOL_IPV6)
858 		return -ENOPROTOOPT;
859 
860 	if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
861 		return compat_mc_setsockopt(sk, level, optname, optval, optlen,
862 			ipv6_setsockopt);
863 
864 	err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
865 #ifdef CONFIG_NETFILTER
866 	/* we need to exclude all possible ENOPROTOOPTs except default case */
867 	if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
868 	    optname != IPV6_XFRM_POLICY) {
869 		lock_sock(sk);
870 		err = compat_nf_setsockopt(sk, PF_INET6, optname,
871 					   optval, optlen);
872 		release_sock(sk);
873 	}
874 #endif
875 	return err;
876 }
877 
878 EXPORT_SYMBOL(compat_ipv6_setsockopt);
879 #endif
880 
ipv6_getsockopt_sticky(struct sock * sk,struct ipv6_txoptions * opt,int optname,char __user * optval,int len)881 static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
882 				  int optname, char __user *optval, int len)
883 {
884 	struct ipv6_opt_hdr *hdr;
885 
886 	if (!opt)
887 		return 0;
888 
889 	switch(optname) {
890 	case IPV6_HOPOPTS:
891 		hdr = opt->hopopt;
892 		break;
893 	case IPV6_RTHDRDSTOPTS:
894 		hdr = opt->dst0opt;
895 		break;
896 	case IPV6_RTHDR:
897 		hdr = (struct ipv6_opt_hdr *)opt->srcrt;
898 		break;
899 	case IPV6_DSTOPTS:
900 		hdr = opt->dst1opt;
901 		break;
902 	default:
903 		return -EINVAL;	/* should not happen */
904 	}
905 
906 	if (!hdr)
907 		return 0;
908 
909 	len = min_t(unsigned int, len, ipv6_optlen(hdr));
910 	if (copy_to_user(optval, hdr, len))
911 		return -EFAULT;
912 	return len;
913 }
914 
do_ipv6_getsockopt(struct sock * sk,int level,int optname,char __user * optval,int __user * optlen)915 static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
916 		    char __user *optval, int __user *optlen)
917 {
918 	struct ipv6_pinfo *np = inet6_sk(sk);
919 	int len;
920 	int val;
921 
922 	if (ip6_mroute_opt(optname))
923 		return ip6_mroute_getsockopt(sk, optname, optval, optlen);
924 
925 	if (get_user(len, optlen))
926 		return -EFAULT;
927 	switch (optname) {
928 	case IPV6_ADDRFORM:
929 		if (sk->sk_protocol != IPPROTO_UDP &&
930 		    sk->sk_protocol != IPPROTO_UDPLITE &&
931 		    sk->sk_protocol != IPPROTO_TCP)
932 			return -ENOPROTOOPT;
933 		if (sk->sk_state != TCP_ESTABLISHED)
934 			return -ENOTCONN;
935 		val = sk->sk_family;
936 		break;
937 	case MCAST_MSFILTER:
938 	{
939 		struct group_filter gsf;
940 		int err;
941 
942 		if (len < GROUP_FILTER_SIZE(0))
943 			return -EINVAL;
944 		if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
945 			return -EFAULT;
946 		if (gsf.gf_group.ss_family != AF_INET6)
947 			return -EADDRNOTAVAIL;
948 		lock_sock(sk);
949 		err = ip6_mc_msfget(sk, &gsf,
950 			(struct group_filter __user *)optval, optlen);
951 		release_sock(sk);
952 		return err;
953 	}
954 
955 	case IPV6_2292PKTOPTIONS:
956 	{
957 		struct msghdr msg;
958 		struct sk_buff *skb;
959 
960 		if (sk->sk_type != SOCK_STREAM)
961 			return -ENOPROTOOPT;
962 
963 		msg.msg_control = optval;
964 		msg.msg_controllen = len;
965 		msg.msg_flags = 0;
966 
967 		lock_sock(sk);
968 		skb = np->pktoptions;
969 		if (skb)
970 			atomic_inc(&skb->users);
971 		release_sock(sk);
972 
973 		if (skb) {
974 			int err = datagram_recv_ctl(sk, &msg, skb);
975 			kfree_skb(skb);
976 			if (err)
977 				return err;
978 		} else {
979 			if (np->rxopt.bits.rxinfo) {
980 				struct in6_pktinfo src_info;
981 				src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
982 					np->sticky_pktinfo.ipi6_ifindex;
983 				np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) :
984 					ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr));
985 				put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
986 			}
987 			if (np->rxopt.bits.rxhlim) {
988 				int hlim = np->mcast_hops;
989 				put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
990 			}
991 			if (np->rxopt.bits.rxoinfo) {
992 				struct in6_pktinfo src_info;
993 				src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
994 					np->sticky_pktinfo.ipi6_ifindex;
995 				np->mcast_oif? ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr) :
996 					ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr));
997 				put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
998 			}
999 			if (np->rxopt.bits.rxohlim) {
1000 				int hlim = np->mcast_hops;
1001 				put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1002 			}
1003 		}
1004 		len -= msg.msg_controllen;
1005 		return put_user(len, optlen);
1006 	}
1007 	case IPV6_MTU:
1008 	{
1009 		struct dst_entry *dst;
1010 
1011 		val = 0;
1012 		rcu_read_lock();
1013 		dst = __sk_dst_get(sk);
1014 		if (dst)
1015 			val = dst_mtu(dst);
1016 		rcu_read_unlock();
1017 		if (!val)
1018 			return -ENOTCONN;
1019 		break;
1020 	}
1021 
1022 	case IPV6_V6ONLY:
1023 		val = np->ipv6only;
1024 		break;
1025 
1026 	case IPV6_RECVPKTINFO:
1027 		val = np->rxopt.bits.rxinfo;
1028 		break;
1029 
1030 	case IPV6_2292PKTINFO:
1031 		val = np->rxopt.bits.rxoinfo;
1032 		break;
1033 
1034 	case IPV6_RECVHOPLIMIT:
1035 		val = np->rxopt.bits.rxhlim;
1036 		break;
1037 
1038 	case IPV6_2292HOPLIMIT:
1039 		val = np->rxopt.bits.rxohlim;
1040 		break;
1041 
1042 	case IPV6_RECVRTHDR:
1043 		val = np->rxopt.bits.srcrt;
1044 		break;
1045 
1046 	case IPV6_2292RTHDR:
1047 		val = np->rxopt.bits.osrcrt;
1048 		break;
1049 
1050 	case IPV6_HOPOPTS:
1051 	case IPV6_RTHDRDSTOPTS:
1052 	case IPV6_RTHDR:
1053 	case IPV6_DSTOPTS:
1054 	{
1055 
1056 		lock_sock(sk);
1057 		len = ipv6_getsockopt_sticky(sk, np->opt,
1058 					     optname, optval, len);
1059 		release_sock(sk);
1060 		/* check if ipv6_getsockopt_sticky() returns err code */
1061 		if (len < 0)
1062 			return len;
1063 		return put_user(len, optlen);
1064 	}
1065 
1066 	case IPV6_RECVHOPOPTS:
1067 		val = np->rxopt.bits.hopopts;
1068 		break;
1069 
1070 	case IPV6_2292HOPOPTS:
1071 		val = np->rxopt.bits.ohopopts;
1072 		break;
1073 
1074 	case IPV6_RECVDSTOPTS:
1075 		val = np->rxopt.bits.dstopts;
1076 		break;
1077 
1078 	case IPV6_2292DSTOPTS:
1079 		val = np->rxopt.bits.odstopts;
1080 		break;
1081 
1082 	case IPV6_TCLASS:
1083 		val = np->tclass;
1084 		break;
1085 
1086 	case IPV6_RECVTCLASS:
1087 		val = np->rxopt.bits.rxtclass;
1088 		break;
1089 
1090 	case IPV6_FLOWINFO:
1091 		val = np->rxopt.bits.rxflow;
1092 		break;
1093 
1094 	case IPV6_RECVPATHMTU:
1095 		val = np->rxopt.bits.rxpmtu;
1096 		break;
1097 
1098 	case IPV6_PATHMTU:
1099 	{
1100 		struct dst_entry *dst;
1101 		struct ip6_mtuinfo mtuinfo;
1102 
1103 		if (len < sizeof(mtuinfo))
1104 			return -EINVAL;
1105 
1106 		len = sizeof(mtuinfo);
1107 		memset(&mtuinfo, 0, sizeof(mtuinfo));
1108 
1109 		rcu_read_lock();
1110 		dst = __sk_dst_get(sk);
1111 		if (dst)
1112 			mtuinfo.ip6m_mtu = dst_mtu(dst);
1113 		rcu_read_unlock();
1114 		if (!mtuinfo.ip6m_mtu)
1115 			return -ENOTCONN;
1116 
1117 		if (put_user(len, optlen))
1118 			return -EFAULT;
1119 		if (copy_to_user(optval, &mtuinfo, len))
1120 			return -EFAULT;
1121 
1122 		return 0;
1123 		break;
1124 	}
1125 
1126 	case IPV6_TRANSPARENT:
1127 		val = inet_sk(sk)->transparent;
1128 		break;
1129 
1130 	case IPV6_RECVORIGDSTADDR:
1131 		val = np->rxopt.bits.rxorigdstaddr;
1132 		break;
1133 
1134 	case IPV6_UNICAST_HOPS:
1135 	case IPV6_MULTICAST_HOPS:
1136 	{
1137 		struct dst_entry *dst;
1138 
1139 		if (optname == IPV6_UNICAST_HOPS)
1140 			val = np->hop_limit;
1141 		else
1142 			val = np->mcast_hops;
1143 
1144 		if (val < 0) {
1145 			rcu_read_lock();
1146 			dst = __sk_dst_get(sk);
1147 			if (dst)
1148 				val = ip6_dst_hoplimit(dst);
1149 			rcu_read_unlock();
1150 		}
1151 
1152 		if (val < 0)
1153 			val = sock_net(sk)->ipv6.devconf_all->hop_limit;
1154 		break;
1155 	}
1156 
1157 	case IPV6_MULTICAST_LOOP:
1158 		val = np->mc_loop;
1159 		break;
1160 
1161 	case IPV6_MULTICAST_IF:
1162 		val = np->mcast_oif;
1163 		break;
1164 
1165 	case IPV6_MTU_DISCOVER:
1166 		val = np->pmtudisc;
1167 		break;
1168 
1169 	case IPV6_RECVERR:
1170 		val = np->recverr;
1171 		break;
1172 
1173 	case IPV6_FLOWINFO_SEND:
1174 		val = np->sndflow;
1175 		break;
1176 
1177 	case IPV6_ADDR_PREFERENCES:
1178 		val = 0;
1179 
1180 		if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1181 			val |= IPV6_PREFER_SRC_TMP;
1182 		else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1183 			val |= IPV6_PREFER_SRC_PUBLIC;
1184 		else {
1185 			/* XXX: should we return system default? */
1186 			val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1187 		}
1188 
1189 		if (np->srcprefs & IPV6_PREFER_SRC_COA)
1190 			val |= IPV6_PREFER_SRC_COA;
1191 		else
1192 			val |= IPV6_PREFER_SRC_HOME;
1193 		break;
1194 
1195 	case IPV6_MINHOPCOUNT:
1196 		val = np->min_hopcount;
1197 		break;
1198 
1199 	case IPV6_DONTFRAG:
1200 		val = np->dontfrag;
1201 		break;
1202 
1203 	default:
1204 		return -ENOPROTOOPT;
1205 	}
1206 	len = min_t(unsigned int, sizeof(int), len);
1207 	if(put_user(len, optlen))
1208 		return -EFAULT;
1209 	if(copy_to_user(optval,&val,len))
1210 		return -EFAULT;
1211 	return 0;
1212 }
1213 
ipv6_getsockopt(struct sock * sk,int level,int optname,char __user * optval,int __user * optlen)1214 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1215 		    char __user *optval, int __user *optlen)
1216 {
1217 	int err;
1218 
1219 	if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1220 		return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1221 
1222 	if(level != SOL_IPV6)
1223 		return -ENOPROTOOPT;
1224 
1225 	err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1226 #ifdef CONFIG_NETFILTER
1227 	/* we need to exclude all possible ENOPROTOOPTs except default case */
1228 	if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1229 		int len;
1230 
1231 		if (get_user(len, optlen))
1232 			return -EFAULT;
1233 
1234 		lock_sock(sk);
1235 		err = nf_getsockopt(sk, PF_INET6, optname, optval,
1236 				&len);
1237 		release_sock(sk);
1238 		if (err >= 0)
1239 			err = put_user(len, optlen);
1240 	}
1241 #endif
1242 	return err;
1243 }
1244 
1245 EXPORT_SYMBOL(ipv6_getsockopt);
1246 
1247 #ifdef CONFIG_COMPAT
compat_ipv6_getsockopt(struct sock * sk,int level,int optname,char __user * optval,int __user * optlen)1248 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1249 			   char __user *optval, int __user *optlen)
1250 {
1251 	int err;
1252 
1253 	if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
1254 		if (udp_prot.compat_getsockopt != NULL)
1255 			return udp_prot.compat_getsockopt(sk, level, optname,
1256 							  optval, optlen);
1257 		return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1258 	}
1259 
1260 	if (level != SOL_IPV6)
1261 		return -ENOPROTOOPT;
1262 
1263 	if (optname == MCAST_MSFILTER)
1264 		return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1265 			ipv6_getsockopt);
1266 
1267 	err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
1268 #ifdef CONFIG_NETFILTER
1269 	/* we need to exclude all possible ENOPROTOOPTs except default case */
1270 	if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
1271 		int len;
1272 
1273 		if (get_user(len, optlen))
1274 			return -EFAULT;
1275 
1276 		lock_sock(sk);
1277 		err = compat_nf_getsockopt(sk, PF_INET6,
1278 					   optname, optval, &len);
1279 		release_sock(sk);
1280 		if (err >= 0)
1281 			err = put_user(len, optlen);
1282 	}
1283 #endif
1284 	return err;
1285 }
1286 
1287 EXPORT_SYMBOL(compat_ipv6_getsockopt);
1288 #endif
1289 
1290