blob: 5f73a7c03e27d334c771f144825c4a2f718d71ba [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * The IP to API glue.
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09007 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 * Authors: see ip.c
9 *
10 * Fixes:
11 * Many : Split from ip.c , see ip.c for history.
12 * Martin Mares : TOS setting fixed.
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +090013 * Alan Cox : Fixed a couple of oopses in Martin's
Linus Torvalds1da177e2005-04-16 15:20:36 -070014 * TOS tweaks.
15 * Mike McLagan : Routing by source
16 */
17
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include <linux/module.h>
19#include <linux/types.h>
20#include <linux/mm.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#include <linux/skbuff.h>
22#include <linux/ip.h>
23#include <linux/icmp.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020024#include <linux/inetdevice.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include <linux/netdevice.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090026#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include <net/sock.h>
28#include <net/ip.h>
29#include <net/icmp.h>
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -080030#include <net/tcp_states.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <linux/udp.h>
32#include <linux/igmp.h>
33#include <linux/netfilter.h>
34#include <linux/route.h>
35#include <linux/mroute.h>
Maciej Żenczykowski2c67e9a2011-10-22 00:07:47 -040036#include <net/inet_ecn.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070037#include <net/route.h>
38#include <net/xfrm.h>
David L Stevensdae50292008-04-27 01:06:07 -070039#include <net/compat.h>
Tom Herbertad6f9392015-01-05 13:56:17 -080040#include <net/checksum.h>
Eric Dumazetdfd56b82011-12-10 09:48:31 +000041#if IS_ENABLED(CONFIG_IPV6)
Linus Torvalds1da177e2005-04-16 15:20:36 -070042#include <net/transp_v6.h>
43#endif
David S. Miller35ebf652012-06-28 03:59:11 -070044#include <net/ip_fib.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
46#include <linux/errqueue.h>
47#include <asm/uaccess.h>
48
Linus Torvalds1da177e2005-04-16 15:20:36 -070049/*
50 * SOL_IP control messages.
51 */
52
53static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
54{
Eric Dumazetd826eb12011-11-09 07:24:35 +000055 struct in_pktinfo info = *PKTINFO_SKB_CB(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070056
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -070057 info.ipi_addr.s_addr = ip_hdr(skb)->daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
59 put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
60}
61
62static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
63{
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -070064 int ttl = ip_hdr(skb)->ttl;
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
66}
67
68static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
69{
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -070070 put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos);
Linus Torvalds1da177e2005-04-16 15:20:36 -070071}
72
73static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
74{
75 if (IPCB(skb)->opt.optlen == 0)
76 return;
77
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -070078 put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen,
79 ip_hdr(skb) + 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -070080}
81
82
83static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb)
84{
85 unsigned char optbuf[sizeof(struct ip_options) + 40];
Daniel Baluta5e73ea12012-04-15 01:34:41 +000086 struct ip_options *opt = (struct ip_options *)optbuf;
Linus Torvalds1da177e2005-04-16 15:20:36 -070087
88 if (IPCB(skb)->opt.optlen == 0)
89 return;
90
91 if (ip_options_echo(opt, skb)) {
92 msg->msg_flags |= MSG_CTRUNC;
93 return;
94 }
95 ip_options_undo(opt);
96
97 put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data);
98}
99
Tom Herbertad6f9392015-01-05 13:56:17 -0800100static void ip_cmsg_recv_checksum(struct msghdr *msg, struct sk_buff *skb,
101 int offset)
102{
103 __wsum csum = skb->csum;
104
105 if (skb->ip_summed != CHECKSUM_COMPLETE)
106 return;
107
108 if (offset != 0)
109 csum = csum_sub(csum, csum_partial(skb->data, offset, 0));
110
111 put_cmsg(msg, SOL_IP, IP_CHECKSUM, sizeof(__wsum), &csum);
112}
113
Catherine Zhang2c7946a2006-03-20 22:41:23 -0800114static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
115{
116 char *secdata;
Catherine Zhangdc49c1f2006-08-02 14:12:06 -0700117 u32 seclen, secid;
Catherine Zhang2c7946a2006-03-20 22:41:23 -0800118 int err;
119
Catherine Zhangdc49c1f2006-08-02 14:12:06 -0700120 err = security_socket_getpeersec_dgram(NULL, skb, &secid);
121 if (err)
122 return;
123
124 err = security_secid_to_secctx(secid, &secdata, &seclen);
Catherine Zhang2c7946a2006-03-20 22:41:23 -0800125 if (err)
126 return;
127
128 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
Catherine Zhangdc49c1f2006-08-02 14:12:06 -0700129 security_release_secctx(secdata, seclen);
Catherine Zhang2c7946a2006-03-20 22:41:23 -0800130}
131
Harvey Harrison21d1a162008-11-20 01:54:27 -0800132static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
Balazs Scheidlere8b2dfe2008-11-16 19:32:39 -0800133{
134 struct sockaddr_in sin;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000135 const struct iphdr *iph = ip_hdr(skb);
Harvey Harrison21d1a162008-11-20 01:54:27 -0800136 __be16 *ports = (__be16 *)skb_transport_header(skb);
Balazs Scheidlere8b2dfe2008-11-16 19:32:39 -0800137
138 if (skb_transport_offset(skb) + 4 > skb->len)
139 return;
140
141 /* All current transport protocols have the port numbers in the
142 * first four bytes of the transport header and this function is
143 * written with this assumption in mind.
144 */
145
146 sin.sin_family = AF_INET;
147 sin.sin_addr.s_addr = iph->daddr;
148 sin.sin_port = ports[1];
149 memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
150
151 put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin);
152}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153
Tom Herbert5961de92015-01-05 13:56:16 -0800154void ip_cmsg_recv_offset(struct msghdr *msg, struct sk_buff *skb,
155 int offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156{
157 struct inet_sock *inet = inet_sk(skb->sk);
Eric Dumazet95c96172012-04-15 05:58:06 +0000158 unsigned int flags = inet->cmsg_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159
160 /* Ordered by supposed usage frequency */
Tom Herbertc44d13d2015-01-05 13:56:15 -0800161 if (flags & IP_CMSG_PKTINFO) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 ip_cmsg_recv_pktinfo(msg, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163
Tom Herbertc44d13d2015-01-05 13:56:15 -0800164 flags &= ~IP_CMSG_PKTINFO;
165 if (!flags)
166 return;
167 }
168
169 if (flags & IP_CMSG_TTL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 ip_cmsg_recv_ttl(msg, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171
Tom Herbertc44d13d2015-01-05 13:56:15 -0800172 flags &= ~IP_CMSG_TTL;
173 if (!flags)
174 return;
175 }
176
177 if (flags & IP_CMSG_TOS) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 ip_cmsg_recv_tos(msg, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179
Tom Herbertc44d13d2015-01-05 13:56:15 -0800180 flags &= ~IP_CMSG_TOS;
181 if (!flags)
182 return;
183 }
184
185 if (flags & IP_CMSG_RECVOPTS) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 ip_cmsg_recv_opts(msg, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187
Tom Herbertc44d13d2015-01-05 13:56:15 -0800188 flags &= ~IP_CMSG_RECVOPTS;
189 if (!flags)
190 return;
191 }
192
193 if (flags & IP_CMSG_RETOPTS) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 ip_cmsg_recv_retopts(msg, skb);
Catherine Zhang2c7946a2006-03-20 22:41:23 -0800195
Tom Herbertc44d13d2015-01-05 13:56:15 -0800196 flags &= ~IP_CMSG_RETOPTS;
197 if (!flags)
198 return;
199 }
200
201 if (flags & IP_CMSG_PASSSEC) {
Catherine Zhang2c7946a2006-03-20 22:41:23 -0800202 ip_cmsg_recv_security(msg, skb);
Balazs Scheidlere8b2dfe2008-11-16 19:32:39 -0800203
Tom Herbertc44d13d2015-01-05 13:56:15 -0800204 flags &= ~IP_CMSG_PASSSEC;
205 if (!flags)
206 return;
207 }
208
Tom Herbertad6f9392015-01-05 13:56:17 -0800209 if (flags & IP_CMSG_ORIGDSTADDR) {
Balazs Scheidlere8b2dfe2008-11-16 19:32:39 -0800210 ip_cmsg_recv_dstaddr(msg, skb);
211
Tom Herbertad6f9392015-01-05 13:56:17 -0800212 flags &= ~IP_CMSG_ORIGDSTADDR;
213 if (!flags)
214 return;
215 }
216
217 if (flags & IP_CMSG_CHECKSUM)
218 ip_cmsg_recv_checksum(msg, skb, offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219}
Tom Herbert5961de92015-01-05 13:56:16 -0800220EXPORT_SYMBOL(ip_cmsg_recv_offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221
Hannes Frederic Sowac8e6ad02014-02-18 21:38:08 +0100222int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc,
223 bool allow_ipv6)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224{
Francesco Fuscof02db312013-09-24 15:43:08 +0200225 int err, val;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 struct cmsghdr *cmsg;
227
Gu Zhengf95b4142014-12-11 11:22:04 +0800228 for_each_cmsghdr(cmsg, msg) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 if (!CMSG_OK(msg, cmsg))
230 return -EINVAL;
Eric Dumazet5337b5b2014-11-10 17:54:25 -0800231#if IS_ENABLED(CONFIG_IPV6)
Hannes Frederic Sowac8e6ad02014-02-18 21:38:08 +0100232 if (allow_ipv6 &&
233 cmsg->cmsg_level == SOL_IPV6 &&
234 cmsg->cmsg_type == IPV6_PKTINFO) {
235 struct in6_pktinfo *src_info;
236
237 if (cmsg->cmsg_len < CMSG_LEN(sizeof(*src_info)))
238 return -EINVAL;
239 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
240 if (!ipv6_addr_v4mapped(&src_info->ipi6_addr))
241 return -EINVAL;
242 ipc->oif = src_info->ipi6_ifindex;
243 ipc->addr = src_info->ipi6_addr.s6_addr32[3];
244 continue;
245 }
246#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 if (cmsg->cmsg_level != SOL_IP)
248 continue;
249 switch (cmsg->cmsg_type) {
250 case IP_RETOPTS:
251 err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700252 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg),
253 err < 40 ? err : 40);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 if (err)
255 return err;
256 break;
257 case IP_PKTINFO:
258 {
259 struct in_pktinfo *info;
260 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
261 return -EINVAL;
262 info = (struct in_pktinfo *)CMSG_DATA(cmsg);
263 ipc->oif = info->ipi_ifindex;
264 ipc->addr = info->ipi_spec_dst.s_addr;
265 break;
266 }
Francesco Fuscof02db312013-09-24 15:43:08 +0200267 case IP_TTL:
268 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
269 return -EINVAL;
270 val = *(int *)CMSG_DATA(cmsg);
271 if (val < 1 || val > 255)
272 return -EINVAL;
273 ipc->ttl = val;
274 break;
275 case IP_TOS:
276 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
277 return -EINVAL;
278 val = *(int *)CMSG_DATA(cmsg);
279 if (val < 0 || val > 255)
280 return -EINVAL;
281 ipc->tos = val;
282 ipc->priority = rt_tos2priority(ipc->tos);
283 break;
284
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 default:
286 return -EINVAL;
287 }
288 }
289 return 0;
290}
291
292
293/* Special input handler for packets caught by router alert option.
294 They are selected only by protocol field, and then processed likely
295 local ones; but only if someone wants them! Otherwise, router
296 not running rsvpd will kill RSVP.
297
298 It is user level problem, what it will make with them.
299 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
300 but receiver should be enough clever f.e. to forward mtrace requests,
301 sent to multicast group to reach destination designated router.
302 */
Eric Dumazet43a951e2010-10-25 03:32:44 +0000303struct ip_ra_chain __rcu *ip_ra_chain;
Eric Dumazet66018502010-06-07 03:12:08 +0000304static DEFINE_SPINLOCK(ip_ra_lock);
305
Eric Dumazet592fcb92010-06-09 16:21:07 +0000306
307static void ip_ra_destroy_rcu(struct rcu_head *head)
Eric Dumazet66018502010-06-07 03:12:08 +0000308{
Eric Dumazet592fcb92010-06-09 16:21:07 +0000309 struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu);
310
311 sock_put(ra->saved_sk);
312 kfree(ra);
Eric Dumazet66018502010-06-07 03:12:08 +0000313}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700315int ip_ra_control(struct sock *sk, unsigned char on,
316 void (*destructor)(struct sock *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317{
Eric Dumazet43a951e2010-10-25 03:32:44 +0000318 struct ip_ra_chain *ra, *new_ra;
319 struct ip_ra_chain __rcu **rap;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000321 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 return -EINVAL;
323
324 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
325
Eric Dumazet66018502010-06-07 03:12:08 +0000326 spin_lock_bh(&ip_ra_lock);
Eric Dumazet43a951e2010-10-25 03:32:44 +0000327 for (rap = &ip_ra_chain;
328 (ra = rcu_dereference_protected(*rap,
329 lockdep_is_held(&ip_ra_lock))) != NULL;
330 rap = &ra->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331 if (ra->sk == sk) {
332 if (on) {
Eric Dumazet66018502010-06-07 03:12:08 +0000333 spin_unlock_bh(&ip_ra_lock);
Jesper Juhla51482b2005-11-08 09:41:34 -0800334 kfree(new_ra);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335 return -EADDRINUSE;
336 }
Eric Dumazet592fcb92010-06-09 16:21:07 +0000337 /* dont let ip_call_ra_chain() use sk again */
338 ra->sk = NULL;
Eric Dumazet8e380f02014-09-09 08:11:41 -0700339 RCU_INIT_POINTER(*rap, ra->next);
Eric Dumazet66018502010-06-07 03:12:08 +0000340 spin_unlock_bh(&ip_ra_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341
342 if (ra->destructor)
343 ra->destructor(sk);
Eric Dumazet592fcb92010-06-09 16:21:07 +0000344 /*
345 * Delay sock_put(sk) and kfree(ra) after one rcu grace
346 * period. This guarantee ip_call_ra_chain() dont need
347 * to mess with socket refcounts.
348 */
349 ra->saved_sk = sk;
350 call_rcu(&ra->rcu, ip_ra_destroy_rcu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 return 0;
352 }
353 }
Ian Morris51456b22015-04-03 09:17:26 +0100354 if (!new_ra) {
Eric Dumazet66018502010-06-07 03:12:08 +0000355 spin_unlock_bh(&ip_ra_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 return -ENOBUFS;
357 }
358 new_ra->sk = sk;
359 new_ra->destructor = destructor;
360
Eric Dumazet8e380f02014-09-09 08:11:41 -0700361 RCU_INIT_POINTER(new_ra->next, ra);
Eric Dumazet66018502010-06-07 03:12:08 +0000362 rcu_assign_pointer(*rap, new_ra);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 sock_hold(sk);
Eric Dumazet66018502010-06-07 03:12:08 +0000364 spin_unlock_bh(&ip_ra_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365
366 return 0;
367}
368
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900369void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
Al Viro35986b32006-09-27 18:34:21 -0700370 __be16 port, u32 info, u8 *payload)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 struct sock_exterr_skb *serr;
373
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 skb = skb_clone(skb, GFP_ATOMIC);
375 if (!skb)
376 return;
377
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900378 serr = SKB_EXT_ERR(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 serr->ee.ee_errno = err;
380 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
Arnaldo Carvalho de Melo88c76642007-03-13 14:43:18 -0300381 serr->ee.ee_type = icmp_hdr(skb)->type;
382 serr->ee.ee_code = icmp_hdr(skb)->code;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 serr->ee.ee_pad = 0;
384 serr->ee.ee_info = info;
385 serr->ee.ee_data = 0;
Arnaldo Carvalho de Melo88c76642007-03-13 14:43:18 -0300386 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700387 skb_network_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 serr->port = port;
389
Ian Morris00db4122015-04-03 09:17:27 +0100390 if (skb_pull(skb, payload - skb->data)) {
Arnaldo Carvalho de Melobd823932007-03-13 17:10:43 -0300391 skb_reset_transport_header(skb);
392 if (sock_queue_err_skb(sk, skb) == 0)
393 return;
394 }
395 kfree_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396}
397
Al Viro05790162006-09-27 18:33:40 -0700398void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399{
400 struct inet_sock *inet = inet_sk(sk);
401 struct sock_exterr_skb *serr;
402 struct iphdr *iph;
403 struct sk_buff *skb;
404
405 if (!inet->recverr)
406 return;
407
408 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
409 if (!skb)
410 return;
411
Arnaldo Carvalho de Melo2ca9e6f2007-03-10 19:15:25 -0300412 skb_put(skb, sizeof(struct iphdr));
413 skb_reset_network_header(skb);
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700414 iph = ip_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 iph->daddr = daddr;
416
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900417 serr = SKB_EXT_ERR(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 serr->ee.ee_errno = err;
419 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900420 serr->ee.ee_type = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 serr->ee.ee_code = 0;
422 serr->ee.ee_pad = 0;
423 serr->ee.ee_info = info;
424 serr->ee.ee_data = 0;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700425 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 serr->port = port;
427
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700428 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
Arnaldo Carvalho de Melobd823932007-03-13 17:10:43 -0300429 skb_reset_transport_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430
431 if (sock_queue_err_skb(sk, skb))
432 kfree_skb(skb);
433}
434
Julian Anastasov34b99df2015-06-23 08:34:39 +0300435/* For some errors we have valid addr_offset even with zero payload and
436 * zero port. Also, addr_offset should be supported if port is set.
437 */
438static inline bool ipv4_datagram_support_addr(struct sock_exterr_skb *serr)
439{
440 return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
441 serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port;
442}
443
Willem de Bruijnc247f052015-03-07 20:33:22 -0500444/* IPv4 supports cmsg on all imcp errors and some timestamps
445 *
446 * Timestamp code paths do not initialize the fields expected by cmsg:
447 * the PKTINFO fields in skb->cb[]. Fill those in here.
448 */
449static bool ipv4_datagram_support_cmsg(const struct sock *sk,
450 struct sk_buff *skb,
451 int ee_origin)
Willem de Bruijn829ae9d2014-11-30 22:22:34 -0500452{
Willem de Bruijnc247f052015-03-07 20:33:22 -0500453 struct in_pktinfo *info;
Willem de Bruijn829ae9d2014-11-30 22:22:34 -0500454
Willem de Bruijnc247f052015-03-07 20:33:22 -0500455 if (ee_origin == SO_EE_ORIGIN_ICMP)
456 return true;
457
458 if (ee_origin == SO_EE_ORIGIN_LOCAL)
459 return false;
460
461 /* Support IP_PKTINFO on tstamp packets if requested, to correlate
462 * timestamp with egress dev. Not possible for packets without dev
463 * or without payload (SOF_TIMESTAMPING_OPT_TSONLY).
464 */
465 if ((!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_CMSG)) ||
Willem de Bruijn829ae9d2014-11-30 22:22:34 -0500466 (!skb->dev))
467 return false;
468
Willem de Bruijnc247f052015-03-07 20:33:22 -0500469 info = PKTINFO_SKB_CB(skb);
Willem de Bruijn829ae9d2014-11-30 22:22:34 -0500470 info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr;
471 info->ipi_ifindex = skb->dev->ifindex;
472 return true;
473}
474
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900475/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 * Handle MSG_ERRQUEUE
477 */
Hannes Frederic Sowa85fbaa72013-11-23 00:46:12 +0100478int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479{
480 struct sock_exterr_skb *serr;
Willem de Bruijn364a9e92014-08-31 21:30:27 -0400481 struct sk_buff *skb;
Steffen Hurrle342dfc32014-01-17 22:53:15 +0100482 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 struct {
484 struct sock_extended_err ee;
485 struct sockaddr_in offender;
486 } errhdr;
487 int err;
488 int copied;
489
Willem de Bruijn7ce875e2014-11-30 22:22:33 -0500490 WARN_ON_ONCE(sk->sk_family == AF_INET6);
491
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492 err = -EAGAIN;
Willem de Bruijn364a9e92014-08-31 21:30:27 -0400493 skb = sock_dequeue_err_skb(sk);
Ian Morris51456b22015-04-03 09:17:26 +0100494 if (!skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 goto out;
496
497 copied = skb->len;
498 if (copied > len) {
499 msg->msg_flags |= MSG_TRUNC;
500 copied = len;
501 }
David S. Miller51f3d022014-11-05 16:46:40 -0500502 err = skb_copy_datagram_msg(skb, 0, msg, copied);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503 if (err)
504 goto out_free_skb;
505
506 sock_recv_timestamp(msg, sk, skb);
507
508 serr = SKB_EXT_ERR(skb);
509
Julian Anastasov34b99df2015-06-23 08:34:39 +0300510 if (sin && ipv4_datagram_support_addr(serr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511 sin->sin_family = AF_INET;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700512 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
513 serr->addr_offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514 sin->sin_port = serr->port;
515 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
Hannes Frederic Sowa85fbaa72013-11-23 00:46:12 +0100516 *addr_len = sizeof(*sin);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 }
518
519 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
520 sin = &errhdr.offender;
Willem de Bruijnf8121162015-01-15 13:18:40 -0500521 memset(sin, 0, sizeof(*sin));
Willem de Bruijn829ae9d2014-11-30 22:22:34 -0500522
Willem de Bruijnc247f052015-03-07 20:33:22 -0500523 if (ipv4_datagram_support_cmsg(sk, skb, serr->ee.ee_origin)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524 sin->sin_family = AF_INET;
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700525 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
Willem de Bruijnf8121162015-01-15 13:18:40 -0500526 if (inet_sk(sk)->cmsg_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527 ip_cmsg_recv(msg, skb);
528 }
529
530 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
531
532 /* Now we could try to dump offended packet options */
533
534 msg->msg_flags |= MSG_ERRQUEUE;
535 err = copied;
536
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900537out_free_skb:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 kfree_skb(skb);
539out:
540 return err;
541}
542
543
544/*
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700545 * Socket option code for IP. This is the end of the line after any
546 * TCP,UDP etc options on an IP socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 */
Marcelo Ricardo Leitnerbaf606d2015-03-18 14:50:42 -0300548static bool setsockopt_needs_rtnl(int optname)
549{
550 switch (optname) {
551 case IP_ADD_MEMBERSHIP:
552 case IP_ADD_SOURCE_MEMBERSHIP:
Marcelo Ricardo Leitner54ff9ef2015-03-18 14:50:43 -0300553 case IP_BLOCK_SOURCE:
Marcelo Ricardo Leitnerbaf606d2015-03-18 14:50:42 -0300554 case IP_DROP_MEMBERSHIP:
Marcelo Ricardo Leitner54ff9ef2015-03-18 14:50:43 -0300555 case IP_DROP_SOURCE_MEMBERSHIP:
556 case IP_MSFILTER:
557 case IP_UNBLOCK_SOURCE:
558 case MCAST_BLOCK_SOURCE:
559 case MCAST_MSFILTER:
Marcelo Ricardo Leitnerbaf606d2015-03-18 14:50:42 -0300560 case MCAST_JOIN_GROUP:
Marcelo Ricardo Leitner54ff9ef2015-03-18 14:50:43 -0300561 case MCAST_JOIN_SOURCE_GROUP:
Marcelo Ricardo Leitnerbaf606d2015-03-18 14:50:42 -0300562 case MCAST_LEAVE_GROUP:
Marcelo Ricardo Leitner54ff9ef2015-03-18 14:50:43 -0300563 case MCAST_LEAVE_SOURCE_GROUP:
564 case MCAST_UNBLOCK_SOURCE:
Marcelo Ricardo Leitnerbaf606d2015-03-18 14:50:42 -0300565 return true;
566 }
567 return false;
568}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800570static int do_ip_setsockopt(struct sock *sk, int level,
David S. Millerb7058842009-09-30 16:12:20 -0700571 int optname, char __user *optval, unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572{
573 struct inet_sock *inet = inet_sk(sk);
Jianjun Kong09cb1052008-11-03 00:27:11 -0800574 int val = 0, err;
Marcelo Ricardo Leitnerbaf606d2015-03-18 14:50:42 -0300575 bool needs_rtnl = setsockopt_needs_rtnl(optname);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576
Xi Wang0c9f79b2012-11-11 11:20:01 +0000577 switch (optname) {
578 case IP_PKTINFO:
579 case IP_RECVTTL:
580 case IP_RECVOPTS:
581 case IP_RECVTOS:
582 case IP_RETOPTS:
583 case IP_TOS:
584 case IP_TTL:
585 case IP_HDRINCL:
586 case IP_MTU_DISCOVER:
587 case IP_RECVERR:
588 case IP_ROUTER_ALERT:
589 case IP_FREEBIND:
590 case IP_PASSSEC:
591 case IP_TRANSPARENT:
592 case IP_MINTTL:
593 case IP_NODEFRAG:
Eric Dumazet90c337d2015-06-06 21:17:57 -0700594 case IP_BIND_ADDRESS_NO_PORT:
Xi Wang0c9f79b2012-11-11 11:20:01 +0000595 case IP_UNICAST_IF:
596 case IP_MULTICAST_TTL:
597 case IP_MULTICAST_ALL:
598 case IP_MULTICAST_LOOP:
599 case IP_RECVORIGDSTADDR:
Tom Herbertad6f9392015-01-05 13:56:17 -0800600 case IP_CHECKSUM:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601 if (optlen >= sizeof(int)) {
602 if (get_user(val, (int __user *) optval))
603 return -EFAULT;
604 } else if (optlen >= sizeof(char)) {
605 unsigned char ucval;
606
607 if (get_user(ucval, (unsigned char __user *) optval))
608 return -EFAULT;
609 val = (int) ucval;
610 }
611 }
612
613 /* If optlen==0, it is equivalent to val == 0 */
614
Pavel Emelyanov6a9fb942007-11-05 21:32:31 -0800615 if (ip_mroute_opt(optname))
Jianjun Kong09cb1052008-11-03 00:27:11 -0800616 return ip_mroute_setsockopt(sk, optname, optval, optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617
618 err = 0;
Marcelo Ricardo Leitnerbaf606d2015-03-18 14:50:42 -0300619 if (needs_rtnl)
620 rtnl_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621 lock_sock(sk);
622
623 switch (optname) {
Stephen Hemminger132adf52007-03-08 20:44:43 -0800624 case IP_OPTIONS:
625 {
Eric Dumazetf6d8bd02011-04-21 09:45:37 +0000626 struct ip_options_rcu *old, *opt = NULL;
627
roel kluin65a1c4f2009-10-23 05:59:21 +0000628 if (optlen > 40)
Stephen Hemminger132adf52007-03-08 20:44:43 -0800629 goto e_inval;
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900630 err = ip_options_get_from_user(sock_net(sk), &opt,
Denis V. Lunevcb846632008-03-24 15:31:00 -0700631 optval, optlen);
Stephen Hemminger132adf52007-03-08 20:44:43 -0800632 if (err)
633 break;
Eric Dumazetf6d8bd02011-04-21 09:45:37 +0000634 old = rcu_dereference_protected(inet->inet_opt,
635 sock_owned_by_user(sk));
Stephen Hemminger132adf52007-03-08 20:44:43 -0800636 if (inet->is_icsk) {
637 struct inet_connection_sock *icsk = inet_csk(sk);
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000638#if IS_ENABLED(CONFIG_IPV6)
Stephen Hemminger132adf52007-03-08 20:44:43 -0800639 if (sk->sk_family == PF_INET ||
640 (!((1 << sk->sk_state) &
641 (TCPF_LISTEN | TCPF_CLOSE)) &&
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000642 inet->inet_daddr != LOOPBACK4_IPV6)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643#endif
Eric Dumazetf6d8bd02011-04-21 09:45:37 +0000644 if (old)
645 icsk->icsk_ext_hdr_len -= old->opt.optlen;
Stephen Hemminger132adf52007-03-08 20:44:43 -0800646 if (opt)
Eric Dumazetf6d8bd02011-04-21 09:45:37 +0000647 icsk->icsk_ext_hdr_len += opt->opt.optlen;
Stephen Hemminger132adf52007-03-08 20:44:43 -0800648 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000649#if IS_ENABLED(CONFIG_IPV6)
Stephen Hemminger132adf52007-03-08 20:44:43 -0800650 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652 }
Eric Dumazetf6d8bd02011-04-21 09:45:37 +0000653 rcu_assign_pointer(inet->inet_opt, opt);
654 if (old)
Paul E. McKenney605b4af2012-01-06 17:08:33 -0800655 kfree_rcu(old, rcu);
Stephen Hemminger132adf52007-03-08 20:44:43 -0800656 break;
657 }
658 case IP_PKTINFO:
659 if (val)
660 inet->cmsg_flags |= IP_CMSG_PKTINFO;
661 else
662 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
663 break;
664 case IP_RECVTTL:
665 if (val)
666 inet->cmsg_flags |= IP_CMSG_TTL;
667 else
668 inet->cmsg_flags &= ~IP_CMSG_TTL;
669 break;
670 case IP_RECVTOS:
671 if (val)
672 inet->cmsg_flags |= IP_CMSG_TOS;
673 else
674 inet->cmsg_flags &= ~IP_CMSG_TOS;
675 break;
676 case IP_RECVOPTS:
677 if (val)
678 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
679 else
680 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
681 break;
682 case IP_RETOPTS:
683 if (val)
684 inet->cmsg_flags |= IP_CMSG_RETOPTS;
685 else
686 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
687 break;
688 case IP_PASSSEC:
689 if (val)
690 inet->cmsg_flags |= IP_CMSG_PASSSEC;
691 else
692 inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
693 break;
Balazs Scheidlere8b2dfe2008-11-16 19:32:39 -0800694 case IP_RECVORIGDSTADDR:
695 if (val)
696 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR;
697 else
698 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR;
699 break;
Tom Herbertad6f9392015-01-05 13:56:17 -0800700 case IP_CHECKSUM:
701 if (val) {
702 if (!(inet->cmsg_flags & IP_CMSG_CHECKSUM)) {
703 inet_inc_convert_csum(sk);
704 inet->cmsg_flags |= IP_CMSG_CHECKSUM;
705 }
706 } else {
707 if (inet->cmsg_flags & IP_CMSG_CHECKSUM) {
708 inet_dec_convert_csum(sk);
709 inet->cmsg_flags &= ~IP_CMSG_CHECKSUM;
710 }
711 }
712 break;
Stephen Hemminger132adf52007-03-08 20:44:43 -0800713 case IP_TOS: /* This sets both TOS and Precedence */
714 if (sk->sk_type == SOCK_STREAM) {
Maciej Żenczykowski2c67e9a2011-10-22 00:07:47 -0400715 val &= ~INET_ECN_MASK;
716 val |= inet->tos & INET_ECN_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717 }
Stephen Hemminger132adf52007-03-08 20:44:43 -0800718 if (inet->tos != val) {
719 inet->tos = val;
720 sk->sk_priority = rt_tos2priority(val);
721 sk_dst_reset(sk);
722 }
723 break;
724 case IP_TTL:
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700725 if (optlen < 1)
Stephen Hemminger132adf52007-03-08 20:44:43 -0800726 goto e_inval;
Cong Wangc9be4a52013-01-07 21:17:00 +0000727 if (val != -1 && (val < 1 || val > 255))
Stephen Hemminger132adf52007-03-08 20:44:43 -0800728 goto e_inval;
729 inet->uc_ttl = val;
730 break;
731 case IP_HDRINCL:
732 if (sk->sk_type != SOCK_RAW) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733 err = -ENOPROTOOPT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734 break;
Stephen Hemminger132adf52007-03-08 20:44:43 -0800735 }
736 inet->hdrincl = val ? 1 : 0;
737 break;
Jiri Olsa7b2ff182010-06-15 01:07:31 +0000738 case IP_NODEFRAG:
739 if (sk->sk_type != SOCK_RAW) {
740 err = -ENOPROTOOPT;
741 break;
742 }
743 inet->nodefrag = val ? 1 : 0;
744 break;
Eric Dumazet90c337d2015-06-06 21:17:57 -0700745 case IP_BIND_ADDRESS_NO_PORT:
746 inet->bind_address_no_port = val ? 1 : 0;
747 break;
Stephen Hemminger132adf52007-03-08 20:44:43 -0800748 case IP_MTU_DISCOVER:
Hannes Frederic Sowa1b346572014-02-26 01:20:42 +0100749 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT)
Stephen Hemminger132adf52007-03-08 20:44:43 -0800750 goto e_inval;
751 inet->pmtudisc = val;
752 break;
753 case IP_RECVERR:
754 inet->recverr = !!val;
755 if (!val)
756 skb_queue_purge(&sk->sk_error_queue);
757 break;
758 case IP_MULTICAST_TTL:
759 if (sk->sk_type == SOCK_STREAM)
760 goto e_inval;
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700761 if (optlen < 1)
Stephen Hemminger132adf52007-03-08 20:44:43 -0800762 goto e_inval;
Jianjun Kong09cb1052008-11-03 00:27:11 -0800763 if (val == -1)
Stephen Hemminger132adf52007-03-08 20:44:43 -0800764 val = 1;
765 if (val < 0 || val > 255)
766 goto e_inval;
767 inet->mc_ttl = val;
768 break;
769 case IP_MULTICAST_LOOP:
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700770 if (optlen < 1)
Stephen Hemminger132adf52007-03-08 20:44:43 -0800771 goto e_inval;
772 inet->mc_loop = !!val;
773 break;
Erich E. Hoover76e21052012-02-08 09:11:07 +0000774 case IP_UNICAST_IF:
775 {
776 struct net_device *dev = NULL;
777 int ifindex;
778
779 if (optlen != sizeof(int))
780 goto e_inval;
781
782 ifindex = (__force int)ntohl((__force __be32)val);
783 if (ifindex == 0) {
784 inet->uc_index = 0;
785 err = 0;
786 break;
787 }
788
789 dev = dev_get_by_index(sock_net(sk), ifindex);
790 err = -EADDRNOTAVAIL;
791 if (!dev)
792 break;
793 dev_put(dev);
794
795 err = -EINVAL;
796 if (sk->sk_bound_dev_if)
797 break;
798
799 inet->uc_index = ifindex;
800 err = 0;
801 break;
802 }
Stephen Hemminger132adf52007-03-08 20:44:43 -0800803 case IP_MULTICAST_IF:
804 {
805 struct ip_mreqn mreq;
806 struct net_device *dev = NULL;
807
808 if (sk->sk_type == SOCK_STREAM)
809 goto e_inval;
810 /*
811 * Check the arguments are allowable
812 */
813
Shan Wei09159212009-09-22 15:41:10 +0000814 if (optlen < sizeof(struct in_addr))
815 goto e_inval;
816
Stephen Hemminger132adf52007-03-08 20:44:43 -0800817 err = -EFAULT;
818 if (optlen >= sizeof(struct ip_mreqn)) {
Jianjun Kong09cb1052008-11-03 00:27:11 -0800819 if (copy_from_user(&mreq, optval, sizeof(mreq)))
Stephen Hemminger132adf52007-03-08 20:44:43 -0800820 break;
821 } else {
822 memset(&mreq, 0, sizeof(mreq));
Jiri Pirko3a084dd2012-05-03 22:37:45 +0000823 if (optlen >= sizeof(struct ip_mreq)) {
824 if (copy_from_user(&mreq, optval,
825 sizeof(struct ip_mreq)))
826 break;
827 } else if (optlen >= sizeof(struct in_addr)) {
828 if (copy_from_user(&mreq.imr_address, optval,
829 sizeof(struct in_addr)))
830 break;
831 }
Stephen Hemminger132adf52007-03-08 20:44:43 -0800832 }
833
834 if (!mreq.imr_ifindex) {
Al Viroe6f1ceb2008-03-17 22:44:53 -0700835 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
Stephen Hemminger132adf52007-03-08 20:44:43 -0800836 inet->mc_index = 0;
837 inet->mc_addr = 0;
838 err = 0;
839 break;
840 }
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900841 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
Eric Dumazet55b80502009-10-19 06:41:58 +0000842 if (dev)
Stephen Hemminger132adf52007-03-08 20:44:43 -0800843 mreq.imr_ifindex = dev->ifindex;
Stephen Hemminger132adf52007-03-08 20:44:43 -0800844 } else
Eric Dumazet55b80502009-10-19 06:41:58 +0000845 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
Stephen Hemminger132adf52007-03-08 20:44:43 -0800846
847
848 err = -EADDRNOTAVAIL;
849 if (!dev)
850 break;
Eric Dumazet55b80502009-10-19 06:41:58 +0000851 dev_put(dev);
Stephen Hemminger132adf52007-03-08 20:44:43 -0800852
853 err = -EINVAL;
854 if (sk->sk_bound_dev_if &&
855 mreq.imr_ifindex != sk->sk_bound_dev_if)
856 break;
857
858 inet->mc_index = mreq.imr_ifindex;
859 inet->mc_addr = mreq.imr_address.s_addr;
860 err = 0;
861 break;
862 }
863
864 case IP_ADD_MEMBERSHIP:
865 case IP_DROP_MEMBERSHIP:
866 {
867 struct ip_mreqn mreq;
868
Flavio Leitnera96fb492007-08-24 22:16:39 -0700869 err = -EPROTO;
870 if (inet_sk(sk)->is_icsk)
871 break;
872
Stephen Hemminger132adf52007-03-08 20:44:43 -0800873 if (optlen < sizeof(struct ip_mreq))
874 goto e_inval;
875 err = -EFAULT;
876 if (optlen >= sizeof(struct ip_mreqn)) {
Jianjun Kong09cb1052008-11-03 00:27:11 -0800877 if (copy_from_user(&mreq, optval, sizeof(mreq)))
Stephen Hemminger132adf52007-03-08 20:44:43 -0800878 break;
879 } else {
880 memset(&mreq, 0, sizeof(mreq));
Jianjun Kong09cb1052008-11-03 00:27:11 -0800881 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq)))
Stephen Hemminger132adf52007-03-08 20:44:43 -0800882 break;
883 }
884
885 if (optname == IP_ADD_MEMBERSHIP)
Marcelo Ricardo Leitner54ff9ef2015-03-18 14:50:43 -0300886 err = ip_mc_join_group(sk, &mreq);
Stephen Hemminger132adf52007-03-08 20:44:43 -0800887 else
Marcelo Ricardo Leitner54ff9ef2015-03-18 14:50:43 -0300888 err = ip_mc_leave_group(sk, &mreq);
Stephen Hemminger132adf52007-03-08 20:44:43 -0800889 break;
890 }
891 case IP_MSFILTER:
892 {
Stephen Hemminger132adf52007-03-08 20:44:43 -0800893 struct ip_msfilter *msf;
894
895 if (optlen < IP_MSFILTER_SIZE(0))
896 goto e_inval;
897 if (optlen > sysctl_optmem_max) {
898 err = -ENOBUFS;
899 break;
900 }
901 msf = kmalloc(optlen, GFP_KERNEL);
Stephen Hemmingercfcabdc2007-10-09 01:59:42 -0700902 if (!msf) {
Stephen Hemminger132adf52007-03-08 20:44:43 -0800903 err = -ENOBUFS;
904 break;
905 }
906 err = -EFAULT;
907 if (copy_from_user(msf, optval, optlen)) {
908 kfree(msf);
909 break;
910 }
911 /* numsrc >= (1G-4) overflow in 32 bits */
912 if (msf->imsf_numsrc >= 0x3ffffffcU ||
913 msf->imsf_numsrc > sysctl_igmp_max_msf) {
914 kfree(msf);
915 err = -ENOBUFS;
916 break;
917 }
918 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
919 kfree(msf);
920 err = -EINVAL;
921 break;
922 }
923 err = ip_mc_msfilter(sk, msf, 0);
924 kfree(msf);
925 break;
926 }
927 case IP_BLOCK_SOURCE:
928 case IP_UNBLOCK_SOURCE:
929 case IP_ADD_SOURCE_MEMBERSHIP:
930 case IP_DROP_SOURCE_MEMBERSHIP:
931 {
932 struct ip_mreq_source mreqs;
933 int omode, add;
934
935 if (optlen != sizeof(struct ip_mreq_source))
936 goto e_inval;
937 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
938 err = -EFAULT;
939 break;
940 }
941 if (optname == IP_BLOCK_SOURCE) {
942 omode = MCAST_EXCLUDE;
943 add = 1;
944 } else if (optname == IP_UNBLOCK_SOURCE) {
945 omode = MCAST_EXCLUDE;
946 add = 0;
947 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
948 struct ip_mreqn mreq;
949
950 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
951 mreq.imr_address.s_addr = mreqs.imr_interface;
952 mreq.imr_ifindex = 0;
Marcelo Ricardo Leitner54ff9ef2015-03-18 14:50:43 -0300953 err = ip_mc_join_group(sk, &mreq);
Stephen Hemminger132adf52007-03-08 20:44:43 -0800954 if (err && err != -EADDRINUSE)
955 break;
956 omode = MCAST_INCLUDE;
957 add = 1;
958 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
959 omode = MCAST_INCLUDE;
960 add = 0;
961 }
962 err = ip_mc_source(add, omode, sk, &mreqs, 0);
963 break;
964 }
965 case MCAST_JOIN_GROUP:
966 case MCAST_LEAVE_GROUP:
967 {
968 struct group_req greq;
969 struct sockaddr_in *psin;
970 struct ip_mreqn mreq;
971
972 if (optlen < sizeof(struct group_req))
973 goto e_inval;
974 err = -EFAULT;
975 if (copy_from_user(&greq, optval, sizeof(greq)))
976 break;
977 psin = (struct sockaddr_in *)&greq.gr_group;
978 if (psin->sin_family != AF_INET)
979 goto e_inval;
980 memset(&mreq, 0, sizeof(mreq));
981 mreq.imr_multiaddr = psin->sin_addr;
982 mreq.imr_ifindex = greq.gr_interface;
983
984 if (optname == MCAST_JOIN_GROUP)
Marcelo Ricardo Leitner54ff9ef2015-03-18 14:50:43 -0300985 err = ip_mc_join_group(sk, &mreq);
Stephen Hemminger132adf52007-03-08 20:44:43 -0800986 else
Marcelo Ricardo Leitner54ff9ef2015-03-18 14:50:43 -0300987 err = ip_mc_leave_group(sk, &mreq);
Stephen Hemminger132adf52007-03-08 20:44:43 -0800988 break;
989 }
990 case MCAST_JOIN_SOURCE_GROUP:
991 case MCAST_LEAVE_SOURCE_GROUP:
992 case MCAST_BLOCK_SOURCE:
993 case MCAST_UNBLOCK_SOURCE:
994 {
995 struct group_source_req greqs;
996 struct ip_mreq_source mreqs;
997 struct sockaddr_in *psin;
998 int omode, add;
999
1000 if (optlen != sizeof(struct group_source_req))
1001 goto e_inval;
1002 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
1003 err = -EFAULT;
1004 break;
1005 }
1006 if (greqs.gsr_group.ss_family != AF_INET ||
1007 greqs.gsr_source.ss_family != AF_INET) {
1008 err = -EADDRNOTAVAIL;
1009 break;
1010 }
1011 psin = (struct sockaddr_in *)&greqs.gsr_group;
1012 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
1013 psin = (struct sockaddr_in *)&greqs.gsr_source;
1014 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
1015 mreqs.imr_interface = 0; /* use index for mc_source */
1016
1017 if (optname == MCAST_BLOCK_SOURCE) {
1018 omode = MCAST_EXCLUDE;
1019 add = 1;
1020 } else if (optname == MCAST_UNBLOCK_SOURCE) {
1021 omode = MCAST_EXCLUDE;
1022 add = 0;
1023 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
1024 struct ip_mreqn mreq;
1025
1026 psin = (struct sockaddr_in *)&greqs.gsr_group;
1027 mreq.imr_multiaddr = psin->sin_addr;
1028 mreq.imr_address.s_addr = 0;
1029 mreq.imr_ifindex = greqs.gsr_interface;
Marcelo Ricardo Leitner54ff9ef2015-03-18 14:50:43 -03001030 err = ip_mc_join_group(sk, &mreq);
Stephen Hemminger132adf52007-03-08 20:44:43 -08001031 if (err && err != -EADDRINUSE)
1032 break;
1033 greqs.gsr_interface = mreq.imr_ifindex;
1034 omode = MCAST_INCLUDE;
1035 add = 1;
1036 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
1037 omode = MCAST_INCLUDE;
1038 add = 0;
1039 }
1040 err = ip_mc_source(add, omode, sk, &mreqs,
1041 greqs.gsr_interface);
1042 break;
1043 }
1044 case MCAST_MSFILTER:
1045 {
Stephen Hemminger132adf52007-03-08 20:44:43 -08001046 struct sockaddr_in *psin;
1047 struct ip_msfilter *msf = NULL;
1048 struct group_filter *gsf = NULL;
1049 int msize, i, ifindex;
1050
1051 if (optlen < GROUP_FILTER_SIZE(0))
1052 goto e_inval;
1053 if (optlen > sysctl_optmem_max) {
1054 err = -ENOBUFS;
1055 break;
1056 }
Jianjun Kong09cb1052008-11-03 00:27:11 -08001057 gsf = kmalloc(optlen, GFP_KERNEL);
Stephen Hemmingercfcabdc2007-10-09 01:59:42 -07001058 if (!gsf) {
Stephen Hemminger132adf52007-03-08 20:44:43 -08001059 err = -ENOBUFS;
1060 break;
1061 }
1062 err = -EFAULT;
Eric Dumazet4d52cfb2009-06-02 00:42:16 -07001063 if (copy_from_user(gsf, optval, optlen))
Stephen Hemminger132adf52007-03-08 20:44:43 -08001064 goto mc_msf_out;
Eric Dumazet4d52cfb2009-06-02 00:42:16 -07001065
Stephen Hemminger132adf52007-03-08 20:44:43 -08001066 /* numsrc >= (4G-140)/128 overflow in 32 bits */
1067 if (gsf->gf_numsrc >= 0x1ffffff ||
1068 gsf->gf_numsrc > sysctl_igmp_max_msf) {
1069 err = -ENOBUFS;
1070 goto mc_msf_out;
1071 }
1072 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
1073 err = -EINVAL;
1074 goto mc_msf_out;
1075 }
1076 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
Jianjun Kong09cb1052008-11-03 00:27:11 -08001077 msf = kmalloc(msize, GFP_KERNEL);
Stephen Hemmingercfcabdc2007-10-09 01:59:42 -07001078 if (!msf) {
Stephen Hemminger132adf52007-03-08 20:44:43 -08001079 err = -ENOBUFS;
1080 goto mc_msf_out;
1081 }
1082 ifindex = gsf->gf_interface;
1083 psin = (struct sockaddr_in *)&gsf->gf_group;
1084 if (psin->sin_family != AF_INET) {
1085 err = -EADDRNOTAVAIL;
1086 goto mc_msf_out;
1087 }
1088 msf->imsf_multiaddr = psin->sin_addr.s_addr;
1089 msf->imsf_interface = 0;
1090 msf->imsf_fmode = gsf->gf_fmode;
1091 msf->imsf_numsrc = gsf->gf_numsrc;
1092 err = -EADDRNOTAVAIL;
Eric Dumazet4d52cfb2009-06-02 00:42:16 -07001093 for (i = 0; i < gsf->gf_numsrc; ++i) {
Stephen Hemminger132adf52007-03-08 20:44:43 -08001094 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
1095
1096 if (psin->sin_family != AF_INET)
1097 goto mc_msf_out;
1098 msf->imsf_slist[i] = psin->sin_addr.s_addr;
1099 }
1100 kfree(gsf);
1101 gsf = NULL;
1102
1103 err = ip_mc_msfilter(sk, msf, ifindex);
Eric Dumazet4d52cfb2009-06-02 00:42:16 -07001104mc_msf_out:
Stephen Hemminger132adf52007-03-08 20:44:43 -08001105 kfree(msf);
1106 kfree(gsf);
1107 break;
1108 }
Nivedita Singhvif771bef2009-05-28 07:00:46 +00001109 case IP_MULTICAST_ALL:
1110 if (optlen < 1)
1111 goto e_inval;
1112 if (val != 0 && val != 1)
1113 goto e_inval;
1114 inet->mc_all = val;
1115 break;
Stephen Hemminger132adf52007-03-08 20:44:43 -08001116 case IP_ROUTER_ALERT:
1117 err = ip_ra_control(sk, val ? 1 : 0, NULL);
1118 break;
1119
1120 case IP_FREEBIND:
Eric Dumazet4d52cfb2009-06-02 00:42:16 -07001121 if (optlen < 1)
Stephen Hemminger132adf52007-03-08 20:44:43 -08001122 goto e_inval;
1123 inet->freebind = !!val;
1124 break;
1125
1126 case IP_IPSEC_POLICY:
1127 case IP_XFRM_POLICY:
1128 err = -EPERM;
Eric W. Biederman52e804c2012-11-16 03:03:05 +00001129 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
Stephen Hemminger132adf52007-03-08 20:44:43 -08001130 break;
1131 err = xfrm_user_policy(sk, optname, optval, optlen);
1132 break;
1133
KOVACS Krisztianf5715ae2008-10-01 07:30:02 -07001134 case IP_TRANSPARENT:
Eric W. Biederman52e804c2012-11-16 03:03:05 +00001135 if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) &&
1136 !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
KOVACS Krisztianf5715ae2008-10-01 07:30:02 -07001137 err = -EPERM;
1138 break;
1139 }
1140 if (optlen < 1)
1141 goto e_inval;
1142 inet->transparent = !!val;
1143 break;
1144
Stephen Hemmingerd218d112010-01-11 16:28:01 -08001145 case IP_MINTTL:
1146 if (optlen < 1)
1147 goto e_inval;
1148 if (val < 0 || val > 255)
1149 goto e_inval;
1150 inet->min_ttl = val;
1151 break;
1152
Stephen Hemminger132adf52007-03-08 20:44:43 -08001153 default:
1154 err = -ENOPROTOOPT;
1155 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001156 }
1157 release_sock(sk);
Marcelo Ricardo Leitnerbaf606d2015-03-18 14:50:42 -03001158 if (needs_rtnl)
1159 rtnl_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001160 return err;
1161
1162e_inval:
1163 release_sock(sk);
Marcelo Ricardo Leitnerbaf606d2015-03-18 14:50:42 -03001164 if (needs_rtnl)
1165 rtnl_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001166 return -EINVAL;
1167}
1168
Eric Dumazetf84af322010-04-28 15:31:51 -07001169/**
Willem de Bruijn829ae9d2014-11-30 22:22:34 -05001170 * ipv4_pktinfo_prepare - transfer some info from rtable to skb
Eric Dumazetf84af322010-04-28 15:31:51 -07001171 * @sk: socket
1172 * @skb: buffer
1173 *
David S. Miller35ebf652012-06-28 03:59:11 -07001174 * To support IP_CMSG_PKTINFO option, we store rt_iif and specific
1175 * destination in skb->cb[] before dst drop.
stephen hemminger8e3bff92013-12-08 12:15:44 -08001176 * This way, receiver doesn't make cache line misses to read rtable.
Eric Dumazetf84af322010-04-28 15:31:51 -07001177 */
Shawn Bohrerfbf88662013-10-07 11:01:40 -05001178void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb)
Eric Dumazetf84af322010-04-28 15:31:51 -07001179{
Eric Dumazetd826eb12011-11-09 07:24:35 +00001180 struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb);
Hannes Frederic Sowa4b261c72014-01-20 03:43:08 +01001181 bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) ||
1182 ipv6_sk_rxinfo(sk);
Eric Dumazetd826eb12011-11-09 07:24:35 +00001183
Hannes Frederic Sowa4b261c72014-01-20 03:43:08 +01001184 if (prepare && skb_rtable(skb)) {
David S. Miller92101b32012-07-23 16:29:00 -07001185 pktinfo->ipi_ifindex = inet_iif(skb);
David S. Miller35ebf652012-06-28 03:59:11 -07001186 pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb);
Eric Dumazetd826eb12011-11-09 07:24:35 +00001187 } else {
1188 pktinfo->ipi_ifindex = 0;
1189 pktinfo->ipi_spec_dst.s_addr = 0;
1190 }
1191 skb_dst_drop(skb);
Eric Dumazetf84af322010-04-28 15:31:51 -07001192}
Eric Dumazetf84af322010-04-28 15:31:51 -07001193
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001194int ip_setsockopt(struct sock *sk, int level,
David S. Millerb7058842009-09-30 16:12:20 -07001195 int optname, char __user *optval, unsigned int optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001196{
1197 int err;
1198
1199 if (level != SOL_IP)
1200 return -ENOPROTOOPT;
1201
1202 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1203#ifdef CONFIG_NETFILTER
1204 /* we need to exclude all possible ENOPROTOOPTs except default case */
1205 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
Pavel Emelyanov6a9fb942007-11-05 21:32:31 -08001206 optname != IP_IPSEC_POLICY &&
1207 optname != IP_XFRM_POLICY &&
1208 !ip_mroute_opt(optname)) {
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001209 lock_sock(sk);
1210 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
1211 release_sock(sk);
1212 }
1213#endif
1214 return err;
1215}
Eric Dumazet4d52cfb2009-06-02 00:42:16 -07001216EXPORT_SYMBOL(ip_setsockopt);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001217
1218#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001219int compat_ip_setsockopt(struct sock *sk, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -07001220 char __user *optval, unsigned int optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001221{
1222 int err;
1223
1224 if (level != SOL_IP)
1225 return -ENOPROTOOPT;
1226
David L Stevensdae50292008-04-27 01:06:07 -07001227 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
1228 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
1229 ip_setsockopt);
1230
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001231 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1232#ifdef CONFIG_NETFILTER
1233 /* we need to exclude all possible ENOPROTOOPTs except default case */
1234 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
Pavel Emelyanov6a9fb942007-11-05 21:32:31 -08001235 optname != IP_IPSEC_POLICY &&
1236 optname != IP_XFRM_POLICY &&
1237 !ip_mroute_opt(optname)) {
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001238 lock_sock(sk);
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001239 err = compat_nf_setsockopt(sk, PF_INET, optname,
1240 optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001241 release_sock(sk);
1242 }
1243#endif
1244 return err;
1245}
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001246EXPORT_SYMBOL(compat_ip_setsockopt);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001247#endif
1248
Linus Torvalds1da177e2005-04-16 15:20:36 -07001249/*
Eric Dumazet4d52cfb2009-06-02 00:42:16 -07001250 * Get the options. Note for future reference. The GET of IP options gets
1251 * the _received_ ones. The set sets the _sent_ ones.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001252 */
1253
WANG Cong87e9f032015-11-03 15:41:16 -08001254static bool getsockopt_needs_rtnl(int optname)
1255{
1256 switch (optname) {
1257 case IP_MSFILTER:
1258 case MCAST_MSFILTER:
1259 return true;
1260 }
1261 return false;
1262}
1263
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001264static int do_ip_getsockopt(struct sock *sk, int level, int optname,
Eric Dumazet95c96172012-04-15 05:58:06 +00001265 char __user *optval, int __user *optlen, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001266{
1267 struct inet_sock *inet = inet_sk(sk);
WANG Cong87e9f032015-11-03 15:41:16 -08001268 bool needs_rtnl = getsockopt_needs_rtnl(optname);
1269 int val, err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270 int len;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001271
Stephen Hemminger132adf52007-03-08 20:44:43 -08001272 if (level != SOL_IP)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001273 return -EOPNOTSUPP;
1274
Pavel Emelyanov6a9fb942007-11-05 21:32:31 -08001275 if (ip_mroute_opt(optname))
Jianjun Kong09cb1052008-11-03 00:27:11 -08001276 return ip_mroute_getsockopt(sk, optname, optval, optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001277
Jianjun Kong09cb1052008-11-03 00:27:11 -08001278 if (get_user(len, optlen))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001279 return -EFAULT;
Stephen Hemminger132adf52007-03-08 20:44:43 -08001280 if (len < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001281 return -EINVAL;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001282
WANG Cong87e9f032015-11-03 15:41:16 -08001283 if (needs_rtnl)
1284 rtnl_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001285 lock_sock(sk);
1286
Stephen Hemminger132adf52007-03-08 20:44:43 -08001287 switch (optname) {
1288 case IP_OPTIONS:
1289 {
1290 unsigned char optbuf[sizeof(struct ip_options)+40];
Eric Dumazetf6d8bd02011-04-21 09:45:37 +00001291 struct ip_options *opt = (struct ip_options *)optbuf;
1292 struct ip_options_rcu *inet_opt;
1293
1294 inet_opt = rcu_dereference_protected(inet->inet_opt,
1295 sock_owned_by_user(sk));
Stephen Hemminger132adf52007-03-08 20:44:43 -08001296 opt->optlen = 0;
Eric Dumazetf6d8bd02011-04-21 09:45:37 +00001297 if (inet_opt)
1298 memcpy(optbuf, &inet_opt->opt,
1299 sizeof(struct ip_options) +
1300 inet_opt->opt.optlen);
Stephen Hemminger132adf52007-03-08 20:44:43 -08001301 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001302
Stephen Hemminger132adf52007-03-08 20:44:43 -08001303 if (opt->optlen == 0)
1304 return put_user(0, optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001305
Stephen Hemminger132adf52007-03-08 20:44:43 -08001306 ip_options_undo(opt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001307
Stephen Hemminger132adf52007-03-08 20:44:43 -08001308 len = min_t(unsigned int, len, opt->optlen);
1309 if (put_user(len, optlen))
1310 return -EFAULT;
1311 if (copy_to_user(optval, opt->__data, len))
1312 return -EFAULT;
1313 return 0;
1314 }
1315 case IP_PKTINFO:
1316 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
1317 break;
1318 case IP_RECVTTL:
1319 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1320 break;
1321 case IP_RECVTOS:
1322 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1323 break;
1324 case IP_RECVOPTS:
1325 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1326 break;
1327 case IP_RETOPTS:
1328 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1329 break;
1330 case IP_PASSSEC:
1331 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1332 break;
Balazs Scheidlere8b2dfe2008-11-16 19:32:39 -08001333 case IP_RECVORIGDSTADDR:
1334 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0;
1335 break;
Tom Herbertad6f9392015-01-05 13:56:17 -08001336 case IP_CHECKSUM:
1337 val = (inet->cmsg_flags & IP_CMSG_CHECKSUM) != 0;
1338 break;
Stephen Hemminger132adf52007-03-08 20:44:43 -08001339 case IP_TOS:
1340 val = inet->tos;
1341 break;
1342 case IP_TTL:
1343 val = (inet->uc_ttl == -1 ?
1344 sysctl_ip_default_ttl :
1345 inet->uc_ttl);
1346 break;
1347 case IP_HDRINCL:
1348 val = inet->hdrincl;
1349 break;
Michael Kerriska89b4762010-09-10 20:26:56 +00001350 case IP_NODEFRAG:
1351 val = inet->nodefrag;
1352 break;
Eric Dumazet90c337d2015-06-06 21:17:57 -07001353 case IP_BIND_ADDRESS_NO_PORT:
1354 val = inet->bind_address_no_port;
1355 break;
Stephen Hemminger132adf52007-03-08 20:44:43 -08001356 case IP_MTU_DISCOVER:
1357 val = inet->pmtudisc;
1358 break;
1359 case IP_MTU:
1360 {
1361 struct dst_entry *dst;
1362 val = 0;
1363 dst = sk_dst_get(sk);
1364 if (dst) {
1365 val = dst_mtu(dst);
1366 dst_release(dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001367 }
Stephen Hemminger132adf52007-03-08 20:44:43 -08001368 if (!val) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369 release_sock(sk);
Stephen Hemminger132adf52007-03-08 20:44:43 -08001370 return -ENOTCONN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001371 }
Stephen Hemminger132adf52007-03-08 20:44:43 -08001372 break;
1373 }
1374 case IP_RECVERR:
1375 val = inet->recverr;
1376 break;
1377 case IP_MULTICAST_TTL:
1378 val = inet->mc_ttl;
1379 break;
1380 case IP_MULTICAST_LOOP:
1381 val = inet->mc_loop;
1382 break;
Erich E. Hoover76e21052012-02-08 09:11:07 +00001383 case IP_UNICAST_IF:
1384 val = (__force int)htonl((__u32) inet->uc_index);
1385 break;
Stephen Hemminger132adf52007-03-08 20:44:43 -08001386 case IP_MULTICAST_IF:
1387 {
1388 struct in_addr addr;
1389 len = min_t(unsigned int, len, sizeof(struct in_addr));
1390 addr.s_addr = inet->mc_addr;
1391 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001392
Stephen Hemminger132adf52007-03-08 20:44:43 -08001393 if (put_user(len, optlen))
1394 return -EFAULT;
1395 if (copy_to_user(optval, &addr, len))
1396 return -EFAULT;
1397 return 0;
1398 }
1399 case IP_MSFILTER:
1400 {
1401 struct ip_msfilter msf;
Stephen Hemminger132adf52007-03-08 20:44:43 -08001402
1403 if (len < IP_MSFILTER_SIZE(0)) {
WANG Cong87e9f032015-11-03 15:41:16 -08001404 err = -EINVAL;
1405 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001406 }
Stephen Hemminger132adf52007-03-08 20:44:43 -08001407 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
WANG Cong87e9f032015-11-03 15:41:16 -08001408 err = -EFAULT;
1409 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001410 }
Stephen Hemminger132adf52007-03-08 20:44:43 -08001411 err = ip_mc_msfget(sk, &msf,
1412 (struct ip_msfilter __user *)optval, optlen);
WANG Cong87e9f032015-11-03 15:41:16 -08001413 goto out;
Stephen Hemminger132adf52007-03-08 20:44:43 -08001414 }
1415 case MCAST_MSFILTER:
1416 {
1417 struct group_filter gsf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001418
Stephen Hemminger132adf52007-03-08 20:44:43 -08001419 if (len < GROUP_FILTER_SIZE(0)) {
WANG Cong87e9f032015-11-03 15:41:16 -08001420 err = -EINVAL;
1421 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001422 }
Stephen Hemminger132adf52007-03-08 20:44:43 -08001423 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
WANG Cong87e9f032015-11-03 15:41:16 -08001424 err = -EFAULT;
1425 goto out;
Stephen Hemminger132adf52007-03-08 20:44:43 -08001426 }
1427 err = ip_mc_gsfget(sk, &gsf,
Eric Dumazet4d52cfb2009-06-02 00:42:16 -07001428 (struct group_filter __user *)optval,
1429 optlen);
WANG Cong87e9f032015-11-03 15:41:16 -08001430 goto out;
Stephen Hemminger132adf52007-03-08 20:44:43 -08001431 }
Nivedita Singhvif771bef2009-05-28 07:00:46 +00001432 case IP_MULTICAST_ALL:
1433 val = inet->mc_all;
1434 break;
Stephen Hemminger132adf52007-03-08 20:44:43 -08001435 case IP_PKTOPTIONS:
1436 {
1437 struct msghdr msg;
1438
1439 release_sock(sk);
1440
1441 if (sk->sk_type != SOCK_STREAM)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001442 return -ENOPROTOOPT;
Stephen Hemminger132adf52007-03-08 20:44:43 -08001443
Karoly Kemenyc54a5e02014-07-27 12:29:07 +02001444 msg.msg_control = (__force void *) optval;
Stephen Hemminger132adf52007-03-08 20:44:43 -08001445 msg.msg_controllen = len;
Daniel Balutadd23198e2011-08-07 22:31:07 -07001446 msg.msg_flags = flags;
Stephen Hemminger132adf52007-03-08 20:44:43 -08001447
1448 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1449 struct in_pktinfo info;
1450
Eric Dumazetc720c7e2009-10-15 06:30:45 +00001451 info.ipi_addr.s_addr = inet->inet_rcv_saddr;
1452 info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr;
Stephen Hemminger132adf52007-03-08 20:44:43 -08001453 info.ipi_ifindex = inet->mc_index;
1454 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1455 }
1456 if (inet->cmsg_flags & IP_CMSG_TTL) {
1457 int hlim = inet->mc_ttl;
1458 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1459 }
Jiri Benc4c507d22012-02-09 09:35:49 +00001460 if (inet->cmsg_flags & IP_CMSG_TOS) {
1461 int tos = inet->rcv_tos;
1462 put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos);
1463 }
Stephen Hemminger132adf52007-03-08 20:44:43 -08001464 len -= msg.msg_controllen;
1465 return put_user(len, optlen);
1466 }
1467 case IP_FREEBIND:
1468 val = inet->freebind;
1469 break;
KOVACS Krisztianf5715ae2008-10-01 07:30:02 -07001470 case IP_TRANSPARENT:
1471 val = inet->transparent;
1472 break;
Stephen Hemmingerd218d112010-01-11 16:28:01 -08001473 case IP_MINTTL:
1474 val = inet->min_ttl;
1475 break;
Stephen Hemminger132adf52007-03-08 20:44:43 -08001476 default:
1477 release_sock(sk);
1478 return -ENOPROTOOPT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001479 }
1480 release_sock(sk);
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001481
Eric Dumazet4d52cfb2009-06-02 00:42:16 -07001482 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001483 unsigned char ucval = (unsigned char)val;
1484 len = 1;
Stephen Hemminger132adf52007-03-08 20:44:43 -08001485 if (put_user(len, optlen))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001486 return -EFAULT;
Jianjun Kong09cb1052008-11-03 00:27:11 -08001487 if (copy_to_user(optval, &ucval, 1))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001488 return -EFAULT;
1489 } else {
1490 len = min_t(unsigned int, sizeof(int), len);
Stephen Hemminger132adf52007-03-08 20:44:43 -08001491 if (put_user(len, optlen))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001492 return -EFAULT;
Jianjun Kong09cb1052008-11-03 00:27:11 -08001493 if (copy_to_user(optval, &val, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001494 return -EFAULT;
1495 }
1496 return 0;
WANG Cong87e9f032015-11-03 15:41:16 -08001497
1498out:
1499 release_sock(sk);
1500 if (needs_rtnl)
1501 rtnl_unlock();
1502 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001503}
1504
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001505int ip_getsockopt(struct sock *sk, int level,
Stephen Hemminger132adf52007-03-08 20:44:43 -08001506 int optname, char __user *optval, int __user *optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001507{
1508 int err;
1509
Daniel Balutadd23198e2011-08-07 22:31:07 -07001510 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001511#ifdef CONFIG_NETFILTER
1512 /* we need to exclude all possible ENOPROTOOPTs except default case */
Pavel Emelyanov6a9fb942007-11-05 21:32:31 -08001513 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1514 !ip_mroute_opt(optname)) {
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001515 int len;
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001516
Jianjun Kong09cb1052008-11-03 00:27:11 -08001517 if (get_user(len, optlen))
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001518 return -EFAULT;
1519
1520 lock_sock(sk);
1521 err = nf_getsockopt(sk, PF_INET, optname, optval,
1522 &len);
1523 release_sock(sk);
1524 if (err >= 0)
1525 err = put_user(len, optlen);
1526 return err;
1527 }
1528#endif
1529 return err;
1530}
Eric Dumazet4d52cfb2009-06-02 00:42:16 -07001531EXPORT_SYMBOL(ip_getsockopt);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001532
1533#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001534int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1535 char __user *optval, int __user *optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001536{
David L Stevens42908c62008-04-29 03:23:22 -07001537 int err;
1538
1539 if (optname == MCAST_MSFILTER)
1540 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1541 ip_getsockopt);
1542
Daniel Balutadd23198e2011-08-07 22:31:07 -07001543 err = do_ip_getsockopt(sk, level, optname, optval, optlen,
1544 MSG_CMSG_COMPAT);
David L Stevens42908c62008-04-29 03:23:22 -07001545
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001546#ifdef CONFIG_NETFILTER
1547 /* we need to exclude all possible ENOPROTOOPTs except default case */
Pavel Emelyanov6a9fb942007-11-05 21:32:31 -08001548 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1549 !ip_mroute_opt(optname)) {
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001550 int len;
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001551
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001552 if (get_user(len, optlen))
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001553 return -EFAULT;
1554
1555 lock_sock(sk);
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001556 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001557 release_sock(sk);
1558 if (err >= 0)
1559 err = put_user(len, optlen);
1560 return err;
1561 }
1562#endif
1563 return err;
1564}
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001565EXPORT_SYMBOL(compat_ip_getsockopt);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001566#endif