blob: ee94d31c9d4d494cdfe2dce1ac812e4e094fe65f [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * IPv6 BSD socket options interface
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09003 * Linux INET6 implementation
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
5 * Authors:
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09006 * Pedro Roque <roque@di.fc.ul.pt>
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 *
8 * Based on linux/net/ipv4/ip_sockglue.c
9 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 * 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 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 * 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>
Randy Dunlap4fc268d2006-01-11 12:17:47 -080026#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include <linux/errno.h>
28#include <linux/types.h>
29#include <linux/socket.h>
30#include <linux/sockios.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <linux/net.h>
32#include <linux/in6.h>
YOSHIFUJI Hideaki7bc570c2008-04-03 09:22:53 +090033#include <linux/mroute6.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090039#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
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>
Gerrit Renkerba4e58e2006-11-27 11:10:57 -080052#include <net/udplite.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070053#include <net/xfrm.h>
David L Stevensdae50292008-04-27 01:06:07 -070054#include <net/compat.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070055
56#include <asm/uaccess.h>
57
Linus Torvalds1da177e2005-04-16 15:20:36 -070058struct ip6_ra_chain *ip6_ra_chain;
59DEFINE_RWLOCK(ip6_ra_lock);
60
Denis V. Lunev725a8ff2008-07-19 00:28:58 -070061int ip6_ra_control(struct sock *sk, int sel)
Linus Torvalds1da177e2005-04-16 15:20:36 -070062{
63 struct ip6_ra_chain *ra, *new_ra, **rap;
64
65 /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
Eric Dumazetc720c7e2009-10-15 06:30:45 +000066 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW)
YOSHIFUJI Hideaki17176992008-06-12 03:27:26 +090067 return -ENOPROTOOPT;
Linus Torvalds1da177e2005-04-16 15:20:36 -070068
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);
Jesper Juhla51482b2005-11-08 09:41:34 -080076 kfree(new_ra);
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 return -EADDRINUSE;
78 }
79
80 *rap = ra->next;
81 write_unlock_bh(&ip6_ra_lock);
82
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 new_ra->next = ra;
95 *rap = new_ra;
96 sock_hold(sk);
97 write_unlock_bh(&ip6_ra_lock);
98 return 0;
99}
100
YOSHIFUJI Hideakie7712f12008-04-13 23:21:52 -0700101static
102struct 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)) &&
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000108 inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) {
YOSHIFUJI Hideakie7712f12008-04-13 23:21:52 -0700109 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 {
Eric Dumazetb6c67122010-04-08 23:03:29 +0000115 spin_lock(&sk->sk_dst_lock);
YOSHIFUJI Hideakie7712f12008-04-13 23:21:52 -0700116 opt = xchg(&inet6_sk(sk)->opt, opt);
Eric Dumazetb6c67122010-04-08 23:03:29 +0000117 spin_unlock(&sk->sk_dst_lock);
YOSHIFUJI Hideakie7712f12008-04-13 23:21:52 -0700118 }
119 sk_dst_reset(sk);
120
121 return opt;
122}
123
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800124static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -0700125 char __user *optval, unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126{
127 struct ipv6_pinfo *np = inet6_sk(sk);
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900128 struct net *net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 int val, valbool;
130 int retv = -ENOPROTOOPT;
131
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 if (optval == NULL)
133 val=0;
YOSHIFUJI Hideakib2a9d7c2008-04-12 12:59:42 +0900134 else {
135 if (optlen >= sizeof(int)) {
136 if (get_user(val, (int __user *) optval))
137 return -EFAULT;
138 } else
139 val = 0;
140 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141
142 valbool = (val!=0);
143
YOSHIFUJI Hideaki7bc570c2008-04-03 09:22:53 +0900144 if (ip6_mroute_opt(optname))
145 return ip6_mroute_setsockopt(sk, optname, optval, optlen);
146
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 lock_sock(sk);
148
149 switch (optname) {
150
151 case IPV6_ADDRFORM:
YOSHIFUJI Hideakib2a9d7c2008-04-12 12:59:42 +0900152 if (optlen < sizeof(int))
153 goto e_inval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 if (val == PF_INET) {
155 struct ipv6_txoptions *opt;
156 struct sk_buff *pktopt;
157
Denis V. Lunev49d074f2008-06-04 15:49:06 +0400158 if (sk->sk_type == SOCK_RAW)
159 break;
160
Denis V. Lunev9596cc822008-06-04 15:49:08 +0400161 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)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 break;
170
171 if (sk->sk_state != TCP_ESTABLISHED) {
172 retv = -ENOTCONN;
173 break;
174 }
175
176 if (ipv6_only_sock(sk) ||
Brian Haleye773e4f2007-08-24 23:16:08 -0700177 !ipv6_addr_v4mapped(&np->daddr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 retv = -EADDRNOTAVAIL;
179 break;
180 }
181
182 fl6_free_socklist(sk);
183 ipv6_sock_mc_close(sk);
184
Arnaldo Carvalho de Meloe6848972005-08-09 19:45:38 -0700185 /*
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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 if (sk->sk_protocol == IPPROTO_TCP) {
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -0800193 struct inet_connection_sock *icsk = inet_csk(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 local_bh_disable();
Pavel Emelyanovc29a0bc2008-03-31 19:41:46 -0700195 sock_prot_inuse_add(net, sk->sk_prot, -1);
196 sock_prot_inuse_add(net, &tcp_prot, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 local_bh_enable();
198 sk->sk_prot = &tcp_prot;
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -0800199 icsk->icsk_af_ops = &ipv4_specific;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 sk->sk_socket->ops = &inet_stream_ops;
201 sk->sk_family = PF_INET;
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -0800202 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 } else {
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800204 struct proto *prot = &udp_prot;
205
David S. Millerdb8dac22008-03-06 16:22:02 -0800206 if (sk->sk_protocol == IPPROTO_UDPLITE)
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800207 prot = &udplite_prot;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 local_bh_disable();
Pavel Emelyanovc29a0bc2008-03-31 19:41:46 -0700209 sock_prot_inuse_add(net, sk->sk_prot, -1);
210 sock_prot_inuse_add(net, prot, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 local_bh_enable();
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800212 sk->sk_prot = prot;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 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);
Wei Yongjun800d55f2009-02-23 21:45:33 +0000220 kfree_skb(pktopt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221
222 sk->sk_destruct = inet_sock_destruct;
Arnaldo Carvalho de Meloe6848972005-08-09 19:45:38 -0700223 /*
224 * ... and add it to the refcnt debug socks count
225 * in the new family. -acme
226 */
227 sk_refcnt_debug_inc(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 module_put(THIS_MODULE);
229 retv = 0;
230 break;
231 }
232 goto e_inval;
233
234 case IPV6_V6ONLY:
YOSHIFUJI Hideakib2a9d7c2008-04-12 12:59:42 +0900235 if (optlen < sizeof(int) ||
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000236 inet_sk(sk)->inet_num)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 goto e_inval;
238 np->ipv6only = valbool;
239 retv = 0;
240 break;
241
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900242 case IPV6_RECVPKTINFO:
YOSHIFUJI Hideakib2a9d7c2008-04-12 12:59:42 +0900243 if (optlen < sizeof(int))
244 goto e_inval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 np->rxopt.bits.rxinfo = valbool;
246 retv = 0;
247 break;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900248
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900249 case IPV6_2292PKTINFO:
YOSHIFUJI Hideakib2a9d7c2008-04-12 12:59:42 +0900250 if (optlen < sizeof(int))
251 goto e_inval;
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900252 np->rxopt.bits.rxoinfo = valbool;
253 retv = 0;
254 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900256 case IPV6_RECVHOPLIMIT:
YOSHIFUJI Hideakib2a9d7c2008-04-12 12:59:42 +0900257 if (optlen < sizeof(int))
258 goto e_inval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 np->rxopt.bits.rxhlim = valbool;
260 retv = 0;
261 break;
262
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900263 case IPV6_2292HOPLIMIT:
YOSHIFUJI Hideakib2a9d7c2008-04-12 12:59:42 +0900264 if (optlen < sizeof(int))
265 goto e_inval;
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900266 np->rxopt.bits.rxohlim = valbool;
267 retv = 0;
268 break;
269
270 case IPV6_RECVRTHDR:
YOSHIFUJI Hideakib2a9d7c2008-04-12 12:59:42 +0900271 if (optlen < sizeof(int))
272 goto e_inval;
YOSHIFUJI Hideaki4c752092007-05-23 13:28:48 +0900273 np->rxopt.bits.srcrt = valbool;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 retv = 0;
275 break;
276
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900277 case IPV6_2292RTHDR:
YOSHIFUJI Hideakib2a9d7c2008-04-12 12:59:42 +0900278 if (optlen < sizeof(int))
279 goto e_inval;
YOSHIFUJI Hideaki4c752092007-05-23 13:28:48 +0900280 np->rxopt.bits.osrcrt = valbool;
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900281 retv = 0;
282 break;
283
284 case IPV6_RECVHOPOPTS:
YOSHIFUJI Hideakib2a9d7c2008-04-12 12:59:42 +0900285 if (optlen < sizeof(int))
286 goto e_inval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 np->rxopt.bits.hopopts = valbool;
288 retv = 0;
289 break;
290
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900291 case IPV6_2292HOPOPTS:
YOSHIFUJI Hideakib2a9d7c2008-04-12 12:59:42 +0900292 if (optlen < sizeof(int))
293 goto e_inval;
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900294 np->rxopt.bits.ohopopts = valbool;
295 retv = 0;
296 break;
297
298 case IPV6_RECVDSTOPTS:
YOSHIFUJI Hideakib2a9d7c2008-04-12 12:59:42 +0900299 if (optlen < sizeof(int))
300 goto e_inval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301 np->rxopt.bits.dstopts = valbool;
302 retv = 0;
303 break;
304
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900305 case IPV6_2292DSTOPTS:
YOSHIFUJI Hideakib2a9d7c2008-04-12 12:59:42 +0900306 if (optlen < sizeof(int))
307 goto e_inval;
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900308 np->rxopt.bits.odstopts = valbool;
309 retv = 0;
310 break;
311
YOSHIFUJI Hideaki41a1f8e2005-09-08 10:19:03 +0900312 case IPV6_TCLASS:
YOSHIFUJI Hideakib2a9d7c2008-04-12 12:59:42 +0900313 if (optlen < sizeof(int))
314 goto e_inval;
Remi Denis-Courmontd0ee0112006-09-13 20:08:07 -0700315 if (val < -1 || val > 0xff)
YOSHIFUJI Hideaki41a1f8e2005-09-08 10:19:03 +0900316 goto e_inval;
Gerrit Renker26ced1e2009-08-09 08:12:49 +0000317 /* RFC 3542, 6.5: default traffic class of 0x0 */
318 if (val == -1)
319 val = 0;
YOSHIFUJI Hideaki41a1f8e2005-09-08 10:19:03 +0900320 np->tclass = val;
321 retv = 0;
322 break;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900323
YOSHIFUJI Hideaki41a1f8e2005-09-08 10:19:03 +0900324 case IPV6_RECVTCLASS:
YOSHIFUJI Hideakib2a9d7c2008-04-12 12:59:42 +0900325 if (optlen < sizeof(int))
326 goto e_inval;
YOSHIFUJI Hideaki41a1f8e2005-09-08 10:19:03 +0900327 np->rxopt.bits.rxtclass = valbool;
328 retv = 0;
329 break;
330
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331 case IPV6_FLOWINFO:
YOSHIFUJI Hideakib2a9d7c2008-04-12 12:59:42 +0900332 if (optlen < sizeof(int))
333 goto e_inval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 np->rxopt.bits.rxflow = valbool;
335 retv = 0;
336 break;
337
Brian Haley793b1472010-04-23 11:26:07 +0000338 case IPV6_RECVPATHMTU:
339 if (optlen < sizeof(int))
340 goto e_inval;
341 np->rxopt.bits.rxpmtu = valbool;
342 retv = 0;
343 break;
344
Balazs Scheidler6c468622010-10-21 16:08:28 +0200345 case IPV6_TRANSPARENT:
Eric W. Biedermanaf31f412012-11-16 03:03:06 +0000346 if (valbool && !ns_capable(net->user_ns, CAP_NET_ADMIN) &&
347 !ns_capable(net->user_ns, CAP_NET_RAW)) {
Balazs Scheidlerb8894162010-10-23 04:48:14 +0000348 retv = -EPERM;
349 break;
350 }
Balazs Scheidler6c468622010-10-21 16:08:28 +0200351 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
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900365 case IPV6_HOPOPTS:
366 case IPV6_RTHDRDSTOPTS:
367 case IPV6_RTHDR:
368 case IPV6_DSTOPTS:
369 {
370 struct ipv6_txoptions *opt;
Shan Weiaea74272008-06-19 16:29:39 -0700371
372 /* remove any sticky options header with a zero option
373 * length, per RFC3542.
374 */
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900375 if (optlen == 0)
Luiz Capitulinocb422c42005-11-14 21:43:36 -0800376 optval = NULL;
Yang Hongyangcfb266c2008-08-03 18:16:15 -0700377 else if (optval == NULL)
378 goto e_inval;
Shan Weiaea74272008-06-19 16:29:39 -0700379 else if (optlen < sizeof(struct ipv6_opt_hdr) ||
380 optlen & 0x7 || optlen > 8 * 255)
381 goto e_inval;
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900382
383 /* hop-by-hop / destination options are privileged option */
384 retv = -EPERM;
Eric W. Biedermanaf31f412012-11-16 03:03:06 +0000385 if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900386 break;
387
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900388 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 */
Brian Haley6e093d92008-11-12 22:59:21 -0800397 retv = -EINVAL;
Olaf Kirchdfee0a72007-03-09 13:55:38 -0800398 if (optname == IPV6_RTHDR && opt && opt->srcrt) {
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900399 struct ipv6_rt_hdr *rthdr = opt->srcrt;
Masahide NAKAMURA280a9d32006-08-23 19:17:12 -0700400 switch (rthdr->type) {
Amerigo Wang07a93622012-10-29 16:23:10 +0000401#if IS_ENABLED(CONFIG_IPV6_MIP6)
Masahide NAKAMURA280a9d32006-08-23 19:17:12 -0700402 case IPV6_SRCRT_TYPE_2:
Brian Haley6e093d92008-11-12 22:59:21 -0800403 if (rthdr->hdrlen != 2 ||
404 rthdr->segments_left != 1)
405 goto sticky_done;
406
Masahide NAKAMURA280a9d32006-08-23 19:17:12 -0700407 break;
YOSHIFUJI Hideakibb4dbf92007-07-10 22:55:49 -0700408#endif
Masahide NAKAMURA280a9d32006-08-23 19:17:12 -0700409 default:
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900410 goto sticky_done;
Masahide NAKAMURA280a9d32006-08-23 19:17:12 -0700411 }
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900412 }
413
414 retv = 0;
YOSHIFUJI Hideakie7712f12008-04-13 23:21:52 -0700415 opt = ipv6_update_options(sk, opt);
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900416sticky_done:
417 if (opt)
418 sock_kfree_s(sk, opt, opt->tot_len);
419 break;
420 }
421
Yang Hongyangb24a2512008-12-16 02:06:23 -0800422 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
Ilpo Järvinen914d1162009-01-04 17:27:31 -0800431 if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
Yang Hongyangb24a2512008-12-16 02:06:23 -0800432 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;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000439 np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
Yang Hongyangb24a2512008-12-16 02:06:23 -0800440 retv = 0;
441 break;
442 }
443
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900444 case IPV6_2292PKTOPTIONS:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445 {
446 struct ipv6_txoptions *opt = NULL;
447 struct msghdr msg;
David S. Miller4c9483b2011-03-12 16:22:43 -0500448 struct flowi6 fl6;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 int junk;
450
David S. Miller4c9483b2011-03-12 16:22:43 -0500451 memset(&fl6, 0, sizeof(fl6));
452 fl6.flowi6_oif = sk->sk_bound_dev_if;
453 fl6.flowi6_mark = sk->sk_mark;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454
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
Maciej Żenczykowskiec0506d2011-08-28 12:35:31 +0000479 retv = datagram_send_ctl(net, sk, &msg, &fl6, opt, &junk, &junk,
Brian Haley13b52cd2010-04-23 11:26:08 +0000480 &junk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 if (retv)
482 goto done;
483update:
484 retv = 0;
YOSHIFUJI Hideakie7712f12008-04-13 23:21:52 -0700485 opt = ipv6_update_options(sk, opt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486done:
487 if (opt)
488 sock_kfree_s(sk, opt, opt->tot_len);
489 break;
490 }
491 case IPV6_UNICAST_HOPS:
YOSHIFUJI Hideakib2a9d7c2008-04-12 12:59:42 +0900492 if (optlen < sizeof(int))
493 goto e_inval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494 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)
YOSHIFUJI Hideaki17176992008-06-12 03:27:26 +0900502 break;
YOSHIFUJI Hideakib2a9d7c2008-04-12 12:59:42 +0900503 if (optlen < sizeof(int))
504 goto e_inval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505 if (val > 255 || val < -1)
506 goto e_inval;
Li Wei2a38e6d2011-11-27 21:33:34 +0000507 np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 retv = 0;
509 break;
510
511 case IPV6_MULTICAST_LOOP:
YOSHIFUJI Hideakib2a9d7c2008-04-12 12:59:42 +0900512 if (optlen < sizeof(int))
513 goto e_inval;
YOSHIFUJI Hideaki28d44882008-06-12 03:14:51 +0900514 if (val != valbool)
515 goto e_inval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 np->mc_loop = valbool;
517 retv = 0;
518 break;
519
Erich E. Hooverc4062df2012-02-08 09:11:08 +0000520 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 case IPV6_MULTICAST_IF:
551 if (sk->sk_type == SOCK_STREAM)
YOSHIFUJI Hideaki17176992008-06-12 03:27:26 +0900552 break;
YOSHIFUJI Hideakib2a9d7c2008-04-12 12:59:42 +0900553 if (optlen < sizeof(int))
554 goto e_inval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555
Brian Haley4953f0f2007-10-11 14:39:29 -0700556 if (val) {
Eric Dumazet55b80502009-10-19 06:41:58 +0000557 struct net_device *dev;
558
Brian Haley4953f0f2007-10-11 14:39:29 -0700559 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
560 goto e_inval;
561
Eric Dumazet55b80502009-10-19 06:41:58 +0000562 dev = dev_get_by_index(net, val);
563 if (!dev) {
Brian Haley4953f0f2007-10-11 14:39:29 -0700564 retv = -ENODEV;
565 break;
566 }
Eric Dumazet55b80502009-10-19 06:41:58 +0000567 dev_put(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568 }
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
Wang Chena28398b2008-04-07 09:42:07 +0800577 if (optlen < sizeof(struct ipv6_mreq))
578 goto e_inval;
579
Flavio Leitnera96fb492007-08-24 22:16:39 -0700580 retv = -EPROTO;
581 if (inet_sk(sk)->is_icsk)
582 break;
583
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584 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
Wang Chena28398b2008-04-07 09:42:07 +0800599 if (optlen < sizeof(struct ipv6_mreq))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600 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
Wang Chena28398b2008-04-07 09:42:07 +0800618 if (optlen < sizeof(struct group_req))
619 goto e_inval;
620
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621 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
Wang Chena28398b2008-04-07 09:42:07 +0800645 if (optlen < sizeof(struct group_source_req))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646 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);
David L Stevensc9e3e8b2005-06-21 13:58:25 -0700668 /* prior join w/ different source is ok */
669 if (retv && retv != -EADDRINUSE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670 break;
671 omode = MCAST_INCLUDE;
672 add = 1;
David L Stevensc9e3e8b2005-06-21 13:58:25 -0700673 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674 omode = MCAST_INCLUDE;
675 add = 0;
676 }
677 retv = ip6_mc_source(add, omode, sk, &greqs);
678 break;
679 }
680 case MCAST_MSFILTER:
681 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682 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 }
Kris Katterjohn8b3a7002006-01-11 15:56:43 -0800690 gsf = kmalloc(optlen,GFP_KERNEL);
Stephen Hemmingercfcabdc2007-10-09 01:59:42 -0700691 if (!gsf) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692 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:
YOSHIFUJI Hideakib2a9d7c2008-04-12 12:59:42 +0900718 if (optlen < sizeof(int))
719 goto e_inval;
Denis V. Lunev725a8ff2008-07-19 00:28:58 -0700720 retv = ip6_ra_control(sk, val);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721 break;
722 case IPV6_MTU_DISCOVER:
YOSHIFUJI Hideakib2a9d7c2008-04-12 12:59:42 +0900723 if (optlen < sizeof(int))
724 goto e_inval;
John Dykstra0eae7502009-10-19 21:53:53 -0700725 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_PROBE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726 goto e_inval;
727 np->pmtudisc = val;
728 retv = 0;
729 break;
730 case IPV6_MTU:
YOSHIFUJI Hideakib2a9d7c2008-04-12 12:59:42 +0900731 if (optlen < sizeof(int))
732 goto e_inval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733 if (val && val < IPV6_MIN_MTU)
734 goto e_inval;
735 np->frag_size = val;
736 retv = 0;
737 break;
738 case IPV6_RECVERR:
YOSHIFUJI Hideakib2a9d7c2008-04-12 12:59:42 +0900739 if (optlen < sizeof(int))
740 goto e_inval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741 np->recverr = valbool;
742 if (!val)
743 skb_queue_purge(&sk->sk_error_queue);
744 retv = 0;
745 break;
746 case IPV6_FLOWINFO_SEND:
YOSHIFUJI Hideakib2a9d7c2008-04-12 12:59:42 +0900747 if (optlen < sizeof(int))
748 goto e_inval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749 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:
Herbert Xu6fc0b4a2005-08-06 06:33:15 -0700757 retv = -EPERM;
Eric W. Biedermanaf31f412012-11-16 03:03:06 +0000758 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
Herbert Xu6fc0b4a2005-08-06 06:33:15 -0700759 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760 retv = xfrm_user_policy(sk, optname, optval, optlen);
761 break;
762
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +0900763 case IPV6_ADDR_PREFERENCES:
764 {
765 unsigned int pref = 0;
766 unsigned int prefmask = ~0;
767
YOSHIFUJI Hideakib2a9d7c2008-04-12 12:59:42 +0900768 if (optlen < sizeof(int))
769 goto e_inval;
770
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +0900771 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);
793pref_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;
808pref_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 }
Stephen Hemmingere802af92010-04-22 15:24:53 -0700825 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;
Hannes Frederic Sowad4596ba2012-11-10 19:52:34 +0000831 retv = 0;
Brian Haley793b1472010-04-23 11:26:07 +0000832 break;
833 case IPV6_DONTFRAG:
834 np->dontfrag = valbool;
Stephen Hemmingere802af92010-04-22 15:24:53 -0700835 retv = 0;
836 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837 }
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +0900838
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839 release_sock(sk);
840
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841 return retv;
842
843e_inval:
844 release_sock(sk);
845 return -EINVAL;
846}
847
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800848int ipv6_setsockopt(struct sock *sk, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -0700849 char __user *optval, unsigned int optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800850{
851 int err;
852
853 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
854 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
855
856 if (level != SOL_IPV6)
857 return -ENOPROTOOPT;
858
859 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
860#ifdef CONFIG_NETFILTER
861 /* we need to exclude all possible ENOPROTOOPTs except default case */
862 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
863 optname != IPV6_XFRM_POLICY) {
864 lock_sock(sk);
865 err = nf_setsockopt(sk, PF_INET6, optname, optval,
866 optlen);
867 release_sock(sk);
868 }
869#endif
870 return err;
871}
872
YOSHIFUJI Hideaki71590392007-02-22 22:05:40 +0900873EXPORT_SYMBOL(ipv6_setsockopt);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800874
875#ifdef CONFIG_COMPAT
876int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -0700877 char __user *optval, unsigned int optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800878{
879 int err;
880
881 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800882 if (udp_prot.compat_setsockopt != NULL)
883 return udp_prot.compat_setsockopt(sk, level, optname,
884 optval, optlen);
885 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800886 }
887
888 if (level != SOL_IPV6)
889 return -ENOPROTOOPT;
890
David L Stevensdae50292008-04-27 01:06:07 -0700891 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
892 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
893 ipv6_setsockopt);
894
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800895 err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
896#ifdef CONFIG_NETFILTER
897 /* we need to exclude all possible ENOPROTOOPTs except default case */
898 if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800899 optname != IPV6_XFRM_POLICY) {
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800900 lock_sock(sk);
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800901 err = compat_nf_setsockopt(sk, PF_INET6, optname,
902 optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800903 release_sock(sk);
904 }
905#endif
906 return err;
907}
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800908
909EXPORT_SYMBOL(compat_ipv6_setsockopt);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800910#endif
911
David S. Miller286930792007-03-07 12:50:46 -0800912static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
YOSHIFUJI Hideaki4c6510a2007-03-18 17:35:57 -0700913 int optname, char __user *optval, int len)
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900914{
David S. Miller286930792007-03-07 12:50:46 -0800915 struct ipv6_opt_hdr *hdr;
916
YOSHIFUJI Hideaki4c6510a2007-03-18 17:35:57 -0700917 if (!opt)
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900918 return 0;
YOSHIFUJI Hideaki4c6510a2007-03-18 17:35:57 -0700919
920 switch(optname) {
921 case IPV6_HOPOPTS:
922 hdr = opt->hopopt;
923 break;
924 case IPV6_RTHDRDSTOPTS:
925 hdr = opt->dst0opt;
926 break;
927 case IPV6_RTHDR:
928 hdr = (struct ipv6_opt_hdr *)opt->srcrt;
929 break;
930 case IPV6_DSTOPTS:
931 hdr = opt->dst1opt;
932 break;
933 default:
934 return -EINVAL; /* should not happen */
935 }
936
937 if (!hdr)
938 return 0;
David S. Miller286930792007-03-07 12:50:46 -0800939
Chris Wrightd2b02ed2007-03-09 16:19:17 -0800940 len = min_t(unsigned int, len, ipv6_optlen(hdr));
Ilpo Järvinen660adc62007-08-15 15:07:30 -0700941 if (copy_to_user(optval, hdr, len))
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900942 return -EFAULT;
Yang Hongyang95b496b2008-05-28 16:27:28 +0800943 return len;
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900944}
945
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800946static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
Eric Dumazet95c96172012-04-15 05:58:06 +0000947 char __user *optval, int __user *optlen, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948{
949 struct ipv6_pinfo *np = inet6_sk(sk);
950 int len;
951 int val;
952
YOSHIFUJI Hideaki7bc570c2008-04-03 09:22:53 +0900953 if (ip6_mroute_opt(optname))
954 return ip6_mroute_getsockopt(sk, optname, optval, optlen);
955
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956 if (get_user(len, optlen))
957 return -EFAULT;
958 switch (optname) {
959 case IPV6_ADDRFORM:
960 if (sk->sk_protocol != IPPROTO_UDP &&
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800961 sk->sk_protocol != IPPROTO_UDPLITE &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962 sk->sk_protocol != IPPROTO_TCP)
YOSHIFUJI Hideaki17176992008-06-12 03:27:26 +0900963 return -ENOPROTOOPT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964 if (sk->sk_state != TCP_ESTABLISHED)
965 return -ENOTCONN;
966 val = sk->sk_family;
967 break;
968 case MCAST_MSFILTER:
969 {
970 struct group_filter gsf;
971 int err;
972
973 if (len < GROUP_FILTER_SIZE(0))
974 return -EINVAL;
975 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
976 return -EFAULT;
YOSHIFUJI Hideaki20c61fb2008-04-28 14:40:55 +0900977 if (gsf.gf_group.ss_family != AF_INET6)
978 return -EADDRNOTAVAIL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979 lock_sock(sk);
980 err = ip6_mc_msfget(sk, &gsf,
981 (struct group_filter __user *)optval, optlen);
982 release_sock(sk);
983 return err;
984 }
985
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +0900986 case IPV6_2292PKTOPTIONS:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987 {
988 struct msghdr msg;
989 struct sk_buff *skb;
990
991 if (sk->sk_type != SOCK_STREAM)
992 return -ENOPROTOOPT;
993
994 msg.msg_control = optval;
995 msg.msg_controllen = len;
Daniel Baluta98e77432011-08-19 03:19:07 -0700996 msg.msg_flags = flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997
998 lock_sock(sk);
999 skb = np->pktoptions;
1000 if (skb)
1001 atomic_inc(&skb->users);
1002 release_sock(sk);
1003
1004 if (skb) {
1005 int err = datagram_recv_ctl(sk, &msg, skb);
1006 kfree_skb(skb);
1007 if (err)
1008 return err;
1009 } else {
1010 if (np->rxopt.bits.rxinfo) {
1011 struct in6_pktinfo src_info;
Yang Hongyangf250dcd2008-12-16 02:07:45 -08001012 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1013 np->sticky_pktinfo.ipi6_ifindex;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001014 src_info.ipi6_addr = np->mcast_oif ? np->daddr : np->sticky_pktinfo.ipi6_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
1016 }
1017 if (np->rxopt.bits.rxhlim) {
1018 int hlim = np->mcast_hops;
1019 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
1020 }
Jiri Benc4c507d22012-02-09 09:35:49 +00001021 if (np->rxopt.bits.rxtclass) {
1022 int tclass = np->rcv_tclass;
1023 put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
1024 }
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +09001025 if (np->rxopt.bits.rxoinfo) {
1026 struct in6_pktinfo src_info;
Yang Hongyangf250dcd2008-12-16 02:07:45 -08001027 src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
1028 np->sticky_pktinfo.ipi6_ifindex;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001029 src_info.ipi6_addr = np->mcast_oif ? np->daddr : np->sticky_pktinfo.ipi6_addr;
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +09001030 put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
1031 }
1032 if (np->rxopt.bits.rxohlim) {
1033 int hlim = np->mcast_hops;
1034 put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
1035 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036 }
1037 len -= msg.msg_controllen;
1038 return put_user(len, optlen);
1039 }
1040 case IPV6_MTU:
1041 {
1042 struct dst_entry *dst;
Eric Dumazetb6c67122010-04-08 23:03:29 +00001043
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +09001044 val = 0;
Eric Dumazetb6c67122010-04-08 23:03:29 +00001045 rcu_read_lock();
1046 dst = __sk_dst_get(sk);
1047 if (dst)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001048 val = dst_mtu(dst);
Eric Dumazetb6c67122010-04-08 23:03:29 +00001049 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050 if (!val)
1051 return -ENOTCONN;
1052 break;
1053 }
1054
1055 case IPV6_V6ONLY:
1056 val = np->ipv6only;
1057 break;
1058
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +09001059 case IPV6_RECVPKTINFO:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001060 val = np->rxopt.bits.rxinfo;
1061 break;
1062
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +09001063 case IPV6_2292PKTINFO:
1064 val = np->rxopt.bits.rxoinfo;
1065 break;
1066
1067 case IPV6_RECVHOPLIMIT:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068 val = np->rxopt.bits.rxhlim;
1069 break;
1070
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +09001071 case IPV6_2292HOPLIMIT:
1072 val = np->rxopt.bits.rxohlim;
1073 break;
1074
1075 case IPV6_RECVRTHDR:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001076 val = np->rxopt.bits.srcrt;
1077 break;
1078
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +09001079 case IPV6_2292RTHDR:
1080 val = np->rxopt.bits.osrcrt;
1081 break;
1082
Linus Torvalds1da177e2005-04-16 15:20:36 -07001083 case IPV6_HOPOPTS:
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +09001084 case IPV6_RTHDRDSTOPTS:
1085 case IPV6_RTHDR:
1086 case IPV6_DSTOPTS:
1087 {
1088
1089 lock_sock(sk);
David S. Miller286930792007-03-07 12:50:46 -08001090 len = ipv6_getsockopt_sticky(sk, np->opt,
YOSHIFUJI Hideaki4c6510a2007-03-18 17:35:57 -07001091 optname, optval, len);
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +09001092 release_sock(sk);
Yang Hongyang05335c22008-05-28 16:23:47 +08001093 /* check if ipv6_getsockopt_sticky() returns err code */
1094 if (len < 0)
1095 return len;
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +09001096 return put_user(len, optlen);
1097 }
1098
1099 case IPV6_RECVHOPOPTS:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001100 val = np->rxopt.bits.hopopts;
1101 break;
1102
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +09001103 case IPV6_2292HOPOPTS:
1104 val = np->rxopt.bits.ohopopts;
1105 break;
1106
1107 case IPV6_RECVDSTOPTS:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001108 val = np->rxopt.bits.dstopts;
1109 break;
1110
YOSHIFUJI Hideaki333fad52005-09-08 09:59:17 +09001111 case IPV6_2292DSTOPTS:
1112 val = np->rxopt.bits.odstopts;
1113 break;
1114
YOSHIFUJI Hideaki41a1f8e2005-09-08 10:19:03 +09001115 case IPV6_TCLASS:
1116 val = np->tclass;
1117 break;
1118
1119 case IPV6_RECVTCLASS:
1120 val = np->rxopt.bits.rxtclass;
1121 break;
1122
Linus Torvalds1da177e2005-04-16 15:20:36 -07001123 case IPV6_FLOWINFO:
1124 val = np->rxopt.bits.rxflow;
1125 break;
1126
Brian Haley793b1472010-04-23 11:26:07 +00001127 case IPV6_RECVPATHMTU:
1128 val = np->rxopt.bits.rxpmtu;
1129 break;
1130
1131 case IPV6_PATHMTU:
1132 {
1133 struct dst_entry *dst;
1134 struct ip6_mtuinfo mtuinfo;
1135
1136 if (len < sizeof(mtuinfo))
1137 return -EINVAL;
1138
1139 len = sizeof(mtuinfo);
1140 memset(&mtuinfo, 0, sizeof(mtuinfo));
1141
1142 rcu_read_lock();
1143 dst = __sk_dst_get(sk);
1144 if (dst)
1145 mtuinfo.ip6m_mtu = dst_mtu(dst);
1146 rcu_read_unlock();
1147 if (!mtuinfo.ip6m_mtu)
1148 return -ENOTCONN;
1149
1150 if (put_user(len, optlen))
1151 return -EFAULT;
1152 if (copy_to_user(optval, &mtuinfo, len))
1153 return -EFAULT;
1154
1155 return 0;
1156 break;
1157 }
1158
Balazs Scheidler6c468622010-10-21 16:08:28 +02001159 case IPV6_TRANSPARENT:
1160 val = inet_sk(sk)->transparent;
1161 break;
1162
1163 case IPV6_RECVORIGDSTADDR:
1164 val = np->rxopt.bits.rxorigdstaddr;
1165 break;
1166
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167 case IPV6_UNICAST_HOPS:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001168 case IPV6_MULTICAST_HOPS:
Brian Haleybefffe92006-12-12 17:09:49 -08001169 {
1170 struct dst_entry *dst;
1171
1172 if (optname == IPV6_UNICAST_HOPS)
1173 val = np->hop_limit;
1174 else
1175 val = np->mcast_hops;
1176
Eric Dumazetb6c67122010-04-08 23:03:29 +00001177 if (val < 0) {
1178 rcu_read_lock();
1179 dst = __sk_dst_get(sk);
1180 if (dst)
YOSHIFUJI Hideaki6b75d092008-03-10 06:00:30 -04001181 val = ip6_dst_hoplimit(dst);
Eric Dumazetb6c67122010-04-08 23:03:29 +00001182 rcu_read_unlock();
Brian Haleybefffe92006-12-12 17:09:49 -08001183 }
Eric Dumazetb6c67122010-04-08 23:03:29 +00001184
Brian Haleybefffe92006-12-12 17:09:49 -08001185 if (val < 0)
YOSHIFUJI Hideaki53b79972008-07-19 22:35:03 -07001186 val = sock_net(sk)->ipv6.devconf_all->hop_limit;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001187 break;
Brian Haleybefffe92006-12-12 17:09:49 -08001188 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001189
1190 case IPV6_MULTICAST_LOOP:
1191 val = np->mc_loop;
1192 break;
1193
1194 case IPV6_MULTICAST_IF:
1195 val = np->mcast_oif;
1196 break;
1197
Erich E. Hooverc4062df2012-02-08 09:11:08 +00001198 case IPV6_UNICAST_IF:
1199 val = (__force int)htonl((__u32) np->ucast_oif);
1200 break;
1201
Linus Torvalds1da177e2005-04-16 15:20:36 -07001202 case IPV6_MTU_DISCOVER:
1203 val = np->pmtudisc;
1204 break;
1205
1206 case IPV6_RECVERR:
1207 val = np->recverr;
1208 break;
1209
1210 case IPV6_FLOWINFO_SEND:
1211 val = np->sndflow;
1212 break;
1213
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +09001214 case IPV6_ADDR_PREFERENCES:
1215 val = 0;
1216
1217 if (np->srcprefs & IPV6_PREFER_SRC_TMP)
1218 val |= IPV6_PREFER_SRC_TMP;
1219 else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
1220 val |= IPV6_PREFER_SRC_PUBLIC;
1221 else {
1222 /* XXX: should we return system default? */
1223 val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
1224 }
1225
1226 if (np->srcprefs & IPV6_PREFER_SRC_COA)
1227 val |= IPV6_PREFER_SRC_COA;
1228 else
1229 val |= IPV6_PREFER_SRC_HOME;
1230 break;
1231
Stephen Hemmingere802af92010-04-22 15:24:53 -07001232 case IPV6_MINHOPCOUNT:
1233 val = np->min_hopcount;
1234 break;
1235
Brian Haley793b1472010-04-23 11:26:07 +00001236 case IPV6_DONTFRAG:
1237 val = np->dontfrag;
1238 break;
1239
Linus Torvalds1da177e2005-04-16 15:20:36 -07001240 default:
Wei Yongjuncf6fc4a2007-12-16 13:39:57 -08001241 return -ENOPROTOOPT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001242 }
1243 len = min_t(unsigned int, sizeof(int), len);
1244 if(put_user(len, optlen))
1245 return -EFAULT;
1246 if(copy_to_user(optval,&val,len))
1247 return -EFAULT;
1248 return 0;
1249}
1250
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001251int ipv6_getsockopt(struct sock *sk, int level, int optname,
1252 char __user *optval, int __user *optlen)
1253{
1254 int err;
1255
1256 if (level == SOL_IP && sk->sk_type != SOCK_RAW)
1257 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
1258
1259 if(level != SOL_IPV6)
1260 return -ENOPROTOOPT;
1261
Daniel Baluta98e77432011-08-19 03:19:07 -07001262 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001263#ifdef CONFIG_NETFILTER
Wei Yongjuncf6fc4a2007-12-16 13:39:57 -08001264 /* we need to exclude all possible ENOPROTOOPTs except default case */
1265 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001266 int len;
1267
1268 if (get_user(len, optlen))
1269 return -EFAULT;
1270
1271 lock_sock(sk);
1272 err = nf_getsockopt(sk, PF_INET6, optname, optval,
1273 &len);
1274 release_sock(sk);
1275 if (err >= 0)
1276 err = put_user(len, optlen);
1277 }
1278#endif
1279 return err;
1280}
1281
YOSHIFUJI Hideaki71590392007-02-22 22:05:40 +09001282EXPORT_SYMBOL(ipv6_getsockopt);
1283
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001284#ifdef CONFIG_COMPAT
1285int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001286 char __user *optval, int __user *optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001287{
1288 int err;
1289
1290 if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001291 if (udp_prot.compat_getsockopt != NULL)
1292 return udp_prot.compat_getsockopt(sk, level, optname,
1293 optval, optlen);
1294 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001295 }
1296
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001297 if (level != SOL_IPV6)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001298 return -ENOPROTOOPT;
1299
Pavel Emelyanov80991792008-04-30 14:49:54 -07001300 if (optname == MCAST_MSFILTER)
1301 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1302 ipv6_getsockopt);
1303
Daniel Baluta98e77432011-08-19 03:19:07 -07001304 err = do_ipv6_getsockopt(sk, level, optname, optval, optlen,
1305 MSG_CMSG_COMPAT);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001306#ifdef CONFIG_NETFILTER
Wei Yongjuncf6fc4a2007-12-16 13:39:57 -08001307 /* we need to exclude all possible ENOPROTOOPTs except default case */
1308 if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001309 int len;
1310
1311 if (get_user(len, optlen))
1312 return -EFAULT;
1313
1314 lock_sock(sk);
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001315 err = compat_nf_getsockopt(sk, PF_INET6,
1316 optname, optval, &len);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001317 release_sock(sk);
1318 if (err >= 0)
1319 err = put_user(len, optlen);
1320 }
1321#endif
1322 return err;
1323}
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001324
1325EXPORT_SYMBOL(compat_ipv6_getsockopt);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001326#endif
1327