blob: 3948c86e59ca697645a3316145fca66db5096880 [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>
36#include <net/route.h>
37#include <net/xfrm.h>
David L Stevensdae50292008-04-27 01:06:07 -070038#include <net/compat.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070039#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
40#include <net/transp_v6.h>
41#endif
42
43#include <linux/errqueue.h>
44#include <asm/uaccess.h>
45
46#define IP_CMSG_PKTINFO 1
47#define IP_CMSG_TTL 2
48#define IP_CMSG_TOS 4
49#define IP_CMSG_RECVOPTS 8
50#define IP_CMSG_RETOPTS 16
Catherine Zhang2c7946a2006-03-20 22:41:23 -080051#define IP_CMSG_PASSSEC 32
Balazs Scheidlere8b2dfe2008-11-16 19:32:39 -080052#define IP_CMSG_ORIGDSTADDR 64
Linus Torvalds1da177e2005-04-16 15:20:36 -070053
54/*
55 * SOL_IP control messages.
56 */
57
58static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
59{
60 struct in_pktinfo info;
Eric Dumazet511c3f92009-06-02 05:14:27 +000061 struct rtable *rt = skb_rtable(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -070063 info.ipi_addr.s_addr = ip_hdr(skb)->daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 if (rt) {
65 info.ipi_ifindex = rt->rt_iif;
66 info.ipi_spec_dst.s_addr = rt->rt_spec_dst;
67 } else {
68 info.ipi_ifindex = 0;
69 info.ipi_spec_dst.s_addr = 0;
70 }
71
72 put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
73}
74
75static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
76{
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -070077 int ttl = ip_hdr(skb)->ttl;
Linus Torvalds1da177e2005-04-16 15:20:36 -070078 put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
79}
80
81static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
82{
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -070083 put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos);
Linus Torvalds1da177e2005-04-16 15:20:36 -070084}
85
86static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
87{
88 if (IPCB(skb)->opt.optlen == 0)
89 return;
90
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -070091 put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen,
92 ip_hdr(skb) + 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -070093}
94
95
96static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb)
97{
98 unsigned char optbuf[sizeof(struct ip_options) + 40];
Jianjun Kong09cb1052008-11-03 00:27:11 -080099 struct ip_options * opt = (struct ip_options *)optbuf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100
101 if (IPCB(skb)->opt.optlen == 0)
102 return;
103
104 if (ip_options_echo(opt, skb)) {
105 msg->msg_flags |= MSG_CTRUNC;
106 return;
107 }
108 ip_options_undo(opt);
109
110 put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data);
111}
112
Catherine Zhang2c7946a2006-03-20 22:41:23 -0800113static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
114{
115 char *secdata;
Catherine Zhangdc49c1f2006-08-02 14:12:06 -0700116 u32 seclen, secid;
Catherine Zhang2c7946a2006-03-20 22:41:23 -0800117 int err;
118
Catherine Zhangdc49c1f2006-08-02 14:12:06 -0700119 err = security_socket_getpeersec_dgram(NULL, skb, &secid);
120 if (err)
121 return;
122
123 err = security_secid_to_secctx(secid, &secdata, &seclen);
Catherine Zhang2c7946a2006-03-20 22:41:23 -0800124 if (err)
125 return;
126
127 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
Catherine Zhangdc49c1f2006-08-02 14:12:06 -0700128 security_release_secctx(secdata, seclen);
Catherine Zhang2c7946a2006-03-20 22:41:23 -0800129}
130
Harvey Harrison21d1a162008-11-20 01:54:27 -0800131static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
Balazs Scheidlere8b2dfe2008-11-16 19:32:39 -0800132{
133 struct sockaddr_in sin;
134 struct iphdr *iph = ip_hdr(skb);
Harvey Harrison21d1a162008-11-20 01:54:27 -0800135 __be16 *ports = (__be16 *)skb_transport_header(skb);
Balazs Scheidlere8b2dfe2008-11-16 19:32:39 -0800136
137 if (skb_transport_offset(skb) + 4 > skb->len)
138 return;
139
140 /* All current transport protocols have the port numbers in the
141 * first four bytes of the transport header and this function is
142 * written with this assumption in mind.
143 */
144
145 sin.sin_family = AF_INET;
146 sin.sin_addr.s_addr = iph->daddr;
147 sin.sin_port = ports[1];
148 memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
149
150 put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin);
151}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152
153void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
154{
155 struct inet_sock *inet = inet_sk(skb->sk);
156 unsigned flags = inet->cmsg_flags;
157
158 /* Ordered by supposed usage frequency */
159 if (flags & 1)
160 ip_cmsg_recv_pktinfo(msg, skb);
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700161 if ((flags >>= 1) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 return;
163
164 if (flags & 1)
165 ip_cmsg_recv_ttl(msg, skb);
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700166 if ((flags >>= 1) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 return;
168
169 if (flags & 1)
170 ip_cmsg_recv_tos(msg, skb);
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700171 if ((flags >>= 1) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 return;
173
174 if (flags & 1)
175 ip_cmsg_recv_opts(msg, skb);
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700176 if ((flags >>= 1) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 return;
178
179 if (flags & 1)
180 ip_cmsg_recv_retopts(msg, skb);
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700181 if ((flags >>= 1) == 0)
Catherine Zhang2c7946a2006-03-20 22:41:23 -0800182 return;
183
184 if (flags & 1)
185 ip_cmsg_recv_security(msg, skb);
Balazs Scheidlere8b2dfe2008-11-16 19:32:39 -0800186
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700187 if ((flags >>= 1) == 0)
Balazs Scheidlere8b2dfe2008-11-16 19:32:39 -0800188 return;
189 if (flags & 1)
190 ip_cmsg_recv_dstaddr(msg, skb);
191
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192}
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700193EXPORT_SYMBOL(ip_cmsg_recv);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194
Denis V. Lunev7a6adb92008-03-24 15:30:27 -0700195int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196{
197 int err;
198 struct cmsghdr *cmsg;
199
200 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
201 if (!CMSG_OK(msg, cmsg))
202 return -EINVAL;
203 if (cmsg->cmsg_level != SOL_IP)
204 continue;
205 switch (cmsg->cmsg_type) {
206 case IP_RETOPTS:
207 err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700208 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg),
209 err < 40 ? err : 40);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 if (err)
211 return err;
212 break;
213 case IP_PKTINFO:
214 {
215 struct in_pktinfo *info;
216 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
217 return -EINVAL;
218 info = (struct in_pktinfo *)CMSG_DATA(cmsg);
219 ipc->oif = info->ipi_ifindex;
220 ipc->addr = info->ipi_spec_dst.s_addr;
221 break;
222 }
223 default:
224 return -EINVAL;
225 }
226 }
227 return 0;
228}
229
230
231/* Special input handler for packets caught by router alert option.
232 They are selected only by protocol field, and then processed likely
233 local ones; but only if someone wants them! Otherwise, router
234 not running rsvpd will kill RSVP.
235
236 It is user level problem, what it will make with them.
237 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
238 but receiver should be enough clever f.e. to forward mtrace requests,
239 sent to multicast group to reach destination designated router.
240 */
Eric Dumazet43a951e2010-10-25 03:32:44 +0000241struct ip_ra_chain __rcu *ip_ra_chain;
Eric Dumazet66018502010-06-07 03:12:08 +0000242static DEFINE_SPINLOCK(ip_ra_lock);
243
Eric Dumazet592fcb92010-06-09 16:21:07 +0000244
245static void ip_ra_destroy_rcu(struct rcu_head *head)
Eric Dumazet66018502010-06-07 03:12:08 +0000246{
Eric Dumazet592fcb92010-06-09 16:21:07 +0000247 struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu);
248
249 sock_put(ra->saved_sk);
250 kfree(ra);
Eric Dumazet66018502010-06-07 03:12:08 +0000251}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700253int ip_ra_control(struct sock *sk, unsigned char on,
254 void (*destructor)(struct sock *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255{
Eric Dumazet43a951e2010-10-25 03:32:44 +0000256 struct ip_ra_chain *ra, *new_ra;
257 struct ip_ra_chain __rcu **rap;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000259 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 return -EINVAL;
261
262 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
263
Eric Dumazet66018502010-06-07 03:12:08 +0000264 spin_lock_bh(&ip_ra_lock);
Eric Dumazet43a951e2010-10-25 03:32:44 +0000265 for (rap = &ip_ra_chain;
266 (ra = rcu_dereference_protected(*rap,
267 lockdep_is_held(&ip_ra_lock))) != NULL;
268 rap = &ra->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 if (ra->sk == sk) {
270 if (on) {
Eric Dumazet66018502010-06-07 03:12:08 +0000271 spin_unlock_bh(&ip_ra_lock);
Jesper Juhla51482b2005-11-08 09:41:34 -0800272 kfree(new_ra);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 return -EADDRINUSE;
274 }
Eric Dumazet592fcb92010-06-09 16:21:07 +0000275 /* dont let ip_call_ra_chain() use sk again */
276 ra->sk = NULL;
Eric Dumazet66018502010-06-07 03:12:08 +0000277 rcu_assign_pointer(*rap, ra->next);
278 spin_unlock_bh(&ip_ra_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279
280 if (ra->destructor)
281 ra->destructor(sk);
Eric Dumazet592fcb92010-06-09 16:21:07 +0000282 /*
283 * Delay sock_put(sk) and kfree(ra) after one rcu grace
284 * period. This guarantee ip_call_ra_chain() dont need
285 * to mess with socket refcounts.
286 */
287 ra->saved_sk = sk;
288 call_rcu(&ra->rcu, ip_ra_destroy_rcu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 return 0;
290 }
291 }
292 if (new_ra == NULL) {
Eric Dumazet66018502010-06-07 03:12:08 +0000293 spin_unlock_bh(&ip_ra_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 return -ENOBUFS;
295 }
296 new_ra->sk = sk;
297 new_ra->destructor = destructor;
298
299 new_ra->next = ra;
Eric Dumazet66018502010-06-07 03:12:08 +0000300 rcu_assign_pointer(*rap, new_ra);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301 sock_hold(sk);
Eric Dumazet66018502010-06-07 03:12:08 +0000302 spin_unlock_bh(&ip_ra_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303
304 return 0;
305}
306
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900307void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
Al Viro35986b32006-09-27 18:34:21 -0700308 __be16 port, u32 info, u8 *payload)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 struct sock_exterr_skb *serr;
311
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 skb = skb_clone(skb, GFP_ATOMIC);
313 if (!skb)
314 return;
315
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900316 serr = SKB_EXT_ERR(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 serr->ee.ee_errno = err;
318 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
Arnaldo Carvalho de Melo88c76642007-03-13 14:43:18 -0300319 serr->ee.ee_type = icmp_hdr(skb)->type;
320 serr->ee.ee_code = icmp_hdr(skb)->code;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 serr->ee.ee_pad = 0;
322 serr->ee.ee_info = info;
323 serr->ee.ee_data = 0;
Arnaldo Carvalho de Melo88c76642007-03-13 14:43:18 -0300324 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700325 skb_network_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 serr->port = port;
327
Arnaldo Carvalho de Melobd823932007-03-13 17:10:43 -0300328 if (skb_pull(skb, payload - skb->data) != NULL) {
329 skb_reset_transport_header(skb);
330 if (sock_queue_err_skb(sk, skb) == 0)
331 return;
332 }
333 kfree_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334}
335
Al Viro05790162006-09-27 18:33:40 -0700336void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337{
338 struct inet_sock *inet = inet_sk(sk);
339 struct sock_exterr_skb *serr;
340 struct iphdr *iph;
341 struct sk_buff *skb;
342
343 if (!inet->recverr)
344 return;
345
346 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
347 if (!skb)
348 return;
349
Arnaldo Carvalho de Melo2ca9e6f2007-03-10 19:15:25 -0300350 skb_put(skb, sizeof(struct iphdr));
351 skb_reset_network_header(skb);
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700352 iph = ip_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 iph->daddr = daddr;
354
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900355 serr = SKB_EXT_ERR(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 serr->ee.ee_errno = err;
357 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900358 serr->ee.ee_type = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 serr->ee.ee_code = 0;
360 serr->ee.ee_pad = 0;
361 serr->ee.ee_info = info;
362 serr->ee.ee_data = 0;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700363 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 serr->port = port;
365
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700366 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
Arnaldo Carvalho de Melobd823932007-03-13 17:10:43 -0300367 skb_reset_transport_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368
369 if (sock_queue_err_skb(sk, skb))
370 kfree_skb(skb);
371}
372
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900373/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 * Handle MSG_ERRQUEUE
375 */
376int ip_recv_error(struct sock *sk, struct msghdr *msg, int len)
377{
378 struct sock_exterr_skb *serr;
379 struct sk_buff *skb, *skb2;
380 struct sockaddr_in *sin;
381 struct {
382 struct sock_extended_err ee;
383 struct sockaddr_in offender;
384 } errhdr;
385 int err;
386 int copied;
387
388 err = -EAGAIN;
389 skb = skb_dequeue(&sk->sk_error_queue);
390 if (skb == NULL)
391 goto out;
392
393 copied = skb->len;
394 if (copied > len) {
395 msg->msg_flags |= MSG_TRUNC;
396 copied = len;
397 }
398 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
399 if (err)
400 goto out_free_skb;
401
402 sock_recv_timestamp(msg, sk, skb);
403
404 serr = SKB_EXT_ERR(skb);
405
406 sin = (struct sockaddr_in *)msg->msg_name;
407 if (sin) {
408 sin->sin_family = AF_INET;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700409 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
410 serr->addr_offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 sin->sin_port = serr->port;
412 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
413 }
414
415 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
416 sin = &errhdr.offender;
417 sin->sin_family = AF_UNSPEC;
418 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
419 struct inet_sock *inet = inet_sk(sk);
420
421 sin->sin_family = AF_INET;
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700422 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 sin->sin_port = 0;
424 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
425 if (inet->cmsg_flags)
426 ip_cmsg_recv(msg, skb);
427 }
428
429 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
430
431 /* Now we could try to dump offended packet options */
432
433 msg->msg_flags |= MSG_ERRQUEUE;
434 err = copied;
435
436 /* Reset and regenerate socket error */
Herbert Xue0f9f852005-06-18 22:56:18 -0700437 spin_lock_bh(&sk->sk_error_queue.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 sk->sk_err = 0;
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700439 skb2 = skb_peek(&sk->sk_error_queue);
440 if (skb2 != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
Herbert Xue0f9f852005-06-18 22:56:18 -0700442 spin_unlock_bh(&sk->sk_error_queue.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 sk->sk_error_report(sk);
444 } else
Herbert Xue0f9f852005-06-18 22:56:18 -0700445 spin_unlock_bh(&sk->sk_error_queue.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900447out_free_skb:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 kfree_skb(skb);
449out:
450 return err;
451}
452
453
454/*
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700455 * Socket option code for IP. This is the end of the line after any
456 * TCP,UDP etc options on an IP socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 */
458
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800459static int do_ip_setsockopt(struct sock *sk, int level,
David S. Millerb7058842009-09-30 16:12:20 -0700460 int optname, char __user *optval, unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461{
462 struct inet_sock *inet = inet_sk(sk);
Jianjun Kong09cb1052008-11-03 00:27:11 -0800463 int val = 0, err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900465 if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) |
Stephen Hemminger132adf52007-03-08 20:44:43 -0800466 (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) |
467 (1<<IP_RETOPTS) | (1<<IP_TOS) |
468 (1<<IP_TTL) | (1<<IP_HDRINCL) |
469 (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) |
470 (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) |
Stephen Hemmingerd218d112010-01-11 16:28:01 -0800471 (1<<IP_PASSSEC) | (1<<IP_TRANSPARENT) |
Jiri Olsa7b2ff182010-06-15 01:07:31 +0000472 (1<<IP_MINTTL) | (1<<IP_NODEFRAG))) ||
Stephen Hemminger132adf52007-03-08 20:44:43 -0800473 optname == IP_MULTICAST_TTL ||
Nivedita Singhvif771bef2009-05-28 07:00:46 +0000474 optname == IP_MULTICAST_ALL ||
Balazs Scheidlere8b2dfe2008-11-16 19:32:39 -0800475 optname == IP_MULTICAST_LOOP ||
476 optname == IP_RECVORIGDSTADDR) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 if (optlen >= sizeof(int)) {
478 if (get_user(val, (int __user *) optval))
479 return -EFAULT;
480 } else if (optlen >= sizeof(char)) {
481 unsigned char ucval;
482
483 if (get_user(ucval, (unsigned char __user *) optval))
484 return -EFAULT;
485 val = (int) ucval;
486 }
487 }
488
489 /* If optlen==0, it is equivalent to val == 0 */
490
Pavel Emelyanov6a9fb942007-11-05 21:32:31 -0800491 if (ip_mroute_opt(optname))
Jianjun Kong09cb1052008-11-03 00:27:11 -0800492 return ip_mroute_setsockopt(sk, optname, optval, optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493
494 err = 0;
495 lock_sock(sk);
496
497 switch (optname) {
Stephen Hemminger132adf52007-03-08 20:44:43 -0800498 case IP_OPTIONS:
499 {
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700500 struct ip_options *opt = NULL;
roel kluin65a1c4f2009-10-23 05:59:21 +0000501 if (optlen > 40)
Stephen Hemminger132adf52007-03-08 20:44:43 -0800502 goto e_inval;
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900503 err = ip_options_get_from_user(sock_net(sk), &opt,
Denis V. Lunevcb846632008-03-24 15:31:00 -0700504 optval, optlen);
Stephen Hemminger132adf52007-03-08 20:44:43 -0800505 if (err)
506 break;
507 if (inet->is_icsk) {
508 struct inet_connection_sock *icsk = inet_csk(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
Stephen Hemminger132adf52007-03-08 20:44:43 -0800510 if (sk->sk_family == PF_INET ||
511 (!((1 << sk->sk_state) &
512 (TCPF_LISTEN | TCPF_CLOSE)) &&
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000513 inet->inet_daddr != LOOPBACK4_IPV6)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514#endif
Stephen Hemminger132adf52007-03-08 20:44:43 -0800515 if (inet->opt)
516 icsk->icsk_ext_hdr_len -= inet->opt->optlen;
517 if (opt)
518 icsk->icsk_ext_hdr_len += opt->optlen;
519 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
Stephen Hemminger132adf52007-03-08 20:44:43 -0800521 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523 }
Stephen Hemminger132adf52007-03-08 20:44:43 -0800524 opt = xchg(&inet->opt, opt);
525 kfree(opt);
526 break;
527 }
528 case IP_PKTINFO:
529 if (val)
530 inet->cmsg_flags |= IP_CMSG_PKTINFO;
531 else
532 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
533 break;
534 case IP_RECVTTL:
535 if (val)
536 inet->cmsg_flags |= IP_CMSG_TTL;
537 else
538 inet->cmsg_flags &= ~IP_CMSG_TTL;
539 break;
540 case IP_RECVTOS:
541 if (val)
542 inet->cmsg_flags |= IP_CMSG_TOS;
543 else
544 inet->cmsg_flags &= ~IP_CMSG_TOS;
545 break;
546 case IP_RECVOPTS:
547 if (val)
548 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
549 else
550 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
551 break;
552 case IP_RETOPTS:
553 if (val)
554 inet->cmsg_flags |= IP_CMSG_RETOPTS;
555 else
556 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
557 break;
558 case IP_PASSSEC:
559 if (val)
560 inet->cmsg_flags |= IP_CMSG_PASSSEC;
561 else
562 inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
563 break;
Balazs Scheidlere8b2dfe2008-11-16 19:32:39 -0800564 case IP_RECVORIGDSTADDR:
565 if (val)
566 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR;
567 else
568 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR;
569 break;
Stephen Hemminger132adf52007-03-08 20:44:43 -0800570 case IP_TOS: /* This sets both TOS and Precedence */
571 if (sk->sk_type == SOCK_STREAM) {
572 val &= ~3;
573 val |= inet->tos & 3;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 }
Stephen Hemminger132adf52007-03-08 20:44:43 -0800575 if (inet->tos != val) {
576 inet->tos = val;
577 sk->sk_priority = rt_tos2priority(val);
578 sk_dst_reset(sk);
579 }
580 break;
581 case IP_TTL:
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700582 if (optlen < 1)
Stephen Hemminger132adf52007-03-08 20:44:43 -0800583 goto e_inval;
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700584 if (val != -1 && (val < 0 || val > 255))
Stephen Hemminger132adf52007-03-08 20:44:43 -0800585 goto e_inval;
586 inet->uc_ttl = val;
587 break;
588 case IP_HDRINCL:
589 if (sk->sk_type != SOCK_RAW) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 err = -ENOPROTOOPT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 break;
Stephen Hemminger132adf52007-03-08 20:44:43 -0800592 }
593 inet->hdrincl = val ? 1 : 0;
594 break;
Jiri Olsa7b2ff182010-06-15 01:07:31 +0000595 case IP_NODEFRAG:
596 if (sk->sk_type != SOCK_RAW) {
597 err = -ENOPROTOOPT;
598 break;
599 }
600 inet->nodefrag = val ? 1 : 0;
601 break;
Stephen Hemminger132adf52007-03-08 20:44:43 -0800602 case IP_MTU_DISCOVER:
John Dykstra0eae7502009-10-19 21:53:53 -0700603 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_PROBE)
Stephen Hemminger132adf52007-03-08 20:44:43 -0800604 goto e_inval;
605 inet->pmtudisc = val;
606 break;
607 case IP_RECVERR:
608 inet->recverr = !!val;
609 if (!val)
610 skb_queue_purge(&sk->sk_error_queue);
611 break;
612 case IP_MULTICAST_TTL:
613 if (sk->sk_type == SOCK_STREAM)
614 goto e_inval;
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700615 if (optlen < 1)
Stephen Hemminger132adf52007-03-08 20:44:43 -0800616 goto e_inval;
Jianjun Kong09cb1052008-11-03 00:27:11 -0800617 if (val == -1)
Stephen Hemminger132adf52007-03-08 20:44:43 -0800618 val = 1;
619 if (val < 0 || val > 255)
620 goto e_inval;
621 inet->mc_ttl = val;
622 break;
623 case IP_MULTICAST_LOOP:
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700624 if (optlen < 1)
Stephen Hemminger132adf52007-03-08 20:44:43 -0800625 goto e_inval;
626 inet->mc_loop = !!val;
627 break;
628 case IP_MULTICAST_IF:
629 {
630 struct ip_mreqn mreq;
631 struct net_device *dev = NULL;
632
633 if (sk->sk_type == SOCK_STREAM)
634 goto e_inval;
635 /*
636 * Check the arguments are allowable
637 */
638
Shan Wei09159212009-09-22 15:41:10 +0000639 if (optlen < sizeof(struct in_addr))
640 goto e_inval;
641
Stephen Hemminger132adf52007-03-08 20:44:43 -0800642 err = -EFAULT;
643 if (optlen >= sizeof(struct ip_mreqn)) {
Jianjun Kong09cb1052008-11-03 00:27:11 -0800644 if (copy_from_user(&mreq, optval, sizeof(mreq)))
Stephen Hemminger132adf52007-03-08 20:44:43 -0800645 break;
646 } else {
647 memset(&mreq, 0, sizeof(mreq));
648 if (optlen >= sizeof(struct in_addr) &&
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700649 copy_from_user(&mreq.imr_address, optval,
650 sizeof(struct in_addr)))
Stephen Hemminger132adf52007-03-08 20:44:43 -0800651 break;
652 }
653
654 if (!mreq.imr_ifindex) {
Al Viroe6f1ceb2008-03-17 22:44:53 -0700655 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
Stephen Hemminger132adf52007-03-08 20:44:43 -0800656 inet->mc_index = 0;
657 inet->mc_addr = 0;
658 err = 0;
659 break;
660 }
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900661 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
Eric Dumazet55b80502009-10-19 06:41:58 +0000662 if (dev)
Stephen Hemminger132adf52007-03-08 20:44:43 -0800663 mreq.imr_ifindex = dev->ifindex;
Stephen Hemminger132adf52007-03-08 20:44:43 -0800664 } else
Eric Dumazet55b80502009-10-19 06:41:58 +0000665 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
Stephen Hemminger132adf52007-03-08 20:44:43 -0800666
667
668 err = -EADDRNOTAVAIL;
669 if (!dev)
670 break;
Eric Dumazet55b80502009-10-19 06:41:58 +0000671 dev_put(dev);
Stephen Hemminger132adf52007-03-08 20:44:43 -0800672
673 err = -EINVAL;
674 if (sk->sk_bound_dev_if &&
675 mreq.imr_ifindex != sk->sk_bound_dev_if)
676 break;
677
678 inet->mc_index = mreq.imr_ifindex;
679 inet->mc_addr = mreq.imr_address.s_addr;
680 err = 0;
681 break;
682 }
683
684 case IP_ADD_MEMBERSHIP:
685 case IP_DROP_MEMBERSHIP:
686 {
687 struct ip_mreqn mreq;
688
Flavio Leitnera96fb492007-08-24 22:16:39 -0700689 err = -EPROTO;
690 if (inet_sk(sk)->is_icsk)
691 break;
692
Stephen Hemminger132adf52007-03-08 20:44:43 -0800693 if (optlen < sizeof(struct ip_mreq))
694 goto e_inval;
695 err = -EFAULT;
696 if (optlen >= sizeof(struct ip_mreqn)) {
Jianjun Kong09cb1052008-11-03 00:27:11 -0800697 if (copy_from_user(&mreq, optval, sizeof(mreq)))
Stephen Hemminger132adf52007-03-08 20:44:43 -0800698 break;
699 } else {
700 memset(&mreq, 0, sizeof(mreq));
Jianjun Kong09cb1052008-11-03 00:27:11 -0800701 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq)))
Stephen Hemminger132adf52007-03-08 20:44:43 -0800702 break;
703 }
704
705 if (optname == IP_ADD_MEMBERSHIP)
706 err = ip_mc_join_group(sk, &mreq);
707 else
708 err = ip_mc_leave_group(sk, &mreq);
709 break;
710 }
711 case IP_MSFILTER:
712 {
Stephen Hemminger132adf52007-03-08 20:44:43 -0800713 struct ip_msfilter *msf;
714
715 if (optlen < IP_MSFILTER_SIZE(0))
716 goto e_inval;
717 if (optlen > sysctl_optmem_max) {
718 err = -ENOBUFS;
719 break;
720 }
721 msf = kmalloc(optlen, GFP_KERNEL);
Stephen Hemmingercfcabdc2007-10-09 01:59:42 -0700722 if (!msf) {
Stephen Hemminger132adf52007-03-08 20:44:43 -0800723 err = -ENOBUFS;
724 break;
725 }
726 err = -EFAULT;
727 if (copy_from_user(msf, optval, optlen)) {
728 kfree(msf);
729 break;
730 }
731 /* numsrc >= (1G-4) overflow in 32 bits */
732 if (msf->imsf_numsrc >= 0x3ffffffcU ||
733 msf->imsf_numsrc > sysctl_igmp_max_msf) {
734 kfree(msf);
735 err = -ENOBUFS;
736 break;
737 }
738 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
739 kfree(msf);
740 err = -EINVAL;
741 break;
742 }
743 err = ip_mc_msfilter(sk, msf, 0);
744 kfree(msf);
745 break;
746 }
747 case IP_BLOCK_SOURCE:
748 case IP_UNBLOCK_SOURCE:
749 case IP_ADD_SOURCE_MEMBERSHIP:
750 case IP_DROP_SOURCE_MEMBERSHIP:
751 {
752 struct ip_mreq_source mreqs;
753 int omode, add;
754
755 if (optlen != sizeof(struct ip_mreq_source))
756 goto e_inval;
757 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
758 err = -EFAULT;
759 break;
760 }
761 if (optname == IP_BLOCK_SOURCE) {
762 omode = MCAST_EXCLUDE;
763 add = 1;
764 } else if (optname == IP_UNBLOCK_SOURCE) {
765 omode = MCAST_EXCLUDE;
766 add = 0;
767 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
768 struct ip_mreqn mreq;
769
770 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
771 mreq.imr_address.s_addr = mreqs.imr_interface;
772 mreq.imr_ifindex = 0;
773 err = ip_mc_join_group(sk, &mreq);
774 if (err && err != -EADDRINUSE)
775 break;
776 omode = MCAST_INCLUDE;
777 add = 1;
778 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
779 omode = MCAST_INCLUDE;
780 add = 0;
781 }
782 err = ip_mc_source(add, omode, sk, &mreqs, 0);
783 break;
784 }
785 case MCAST_JOIN_GROUP:
786 case MCAST_LEAVE_GROUP:
787 {
788 struct group_req greq;
789 struct sockaddr_in *psin;
790 struct ip_mreqn mreq;
791
792 if (optlen < sizeof(struct group_req))
793 goto e_inval;
794 err = -EFAULT;
795 if (copy_from_user(&greq, optval, sizeof(greq)))
796 break;
797 psin = (struct sockaddr_in *)&greq.gr_group;
798 if (psin->sin_family != AF_INET)
799 goto e_inval;
800 memset(&mreq, 0, sizeof(mreq));
801 mreq.imr_multiaddr = psin->sin_addr;
802 mreq.imr_ifindex = greq.gr_interface;
803
804 if (optname == MCAST_JOIN_GROUP)
805 err = ip_mc_join_group(sk, &mreq);
806 else
807 err = ip_mc_leave_group(sk, &mreq);
808 break;
809 }
810 case MCAST_JOIN_SOURCE_GROUP:
811 case MCAST_LEAVE_SOURCE_GROUP:
812 case MCAST_BLOCK_SOURCE:
813 case MCAST_UNBLOCK_SOURCE:
814 {
815 struct group_source_req greqs;
816 struct ip_mreq_source mreqs;
817 struct sockaddr_in *psin;
818 int omode, add;
819
820 if (optlen != sizeof(struct group_source_req))
821 goto e_inval;
822 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
823 err = -EFAULT;
824 break;
825 }
826 if (greqs.gsr_group.ss_family != AF_INET ||
827 greqs.gsr_source.ss_family != AF_INET) {
828 err = -EADDRNOTAVAIL;
829 break;
830 }
831 psin = (struct sockaddr_in *)&greqs.gsr_group;
832 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
833 psin = (struct sockaddr_in *)&greqs.gsr_source;
834 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
835 mreqs.imr_interface = 0; /* use index for mc_source */
836
837 if (optname == MCAST_BLOCK_SOURCE) {
838 omode = MCAST_EXCLUDE;
839 add = 1;
840 } else if (optname == MCAST_UNBLOCK_SOURCE) {
841 omode = MCAST_EXCLUDE;
842 add = 0;
843 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
844 struct ip_mreqn mreq;
845
846 psin = (struct sockaddr_in *)&greqs.gsr_group;
847 mreq.imr_multiaddr = psin->sin_addr;
848 mreq.imr_address.s_addr = 0;
849 mreq.imr_ifindex = greqs.gsr_interface;
850 err = ip_mc_join_group(sk, &mreq);
851 if (err && err != -EADDRINUSE)
852 break;
853 greqs.gsr_interface = mreq.imr_ifindex;
854 omode = MCAST_INCLUDE;
855 add = 1;
856 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
857 omode = MCAST_INCLUDE;
858 add = 0;
859 }
860 err = ip_mc_source(add, omode, sk, &mreqs,
861 greqs.gsr_interface);
862 break;
863 }
864 case MCAST_MSFILTER:
865 {
Stephen Hemminger132adf52007-03-08 20:44:43 -0800866 struct sockaddr_in *psin;
867 struct ip_msfilter *msf = NULL;
868 struct group_filter *gsf = NULL;
869 int msize, i, ifindex;
870
871 if (optlen < GROUP_FILTER_SIZE(0))
872 goto e_inval;
873 if (optlen > sysctl_optmem_max) {
874 err = -ENOBUFS;
875 break;
876 }
Jianjun Kong09cb1052008-11-03 00:27:11 -0800877 gsf = kmalloc(optlen, GFP_KERNEL);
Stephen Hemmingercfcabdc2007-10-09 01:59:42 -0700878 if (!gsf) {
Stephen Hemminger132adf52007-03-08 20:44:43 -0800879 err = -ENOBUFS;
880 break;
881 }
882 err = -EFAULT;
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700883 if (copy_from_user(gsf, optval, optlen))
Stephen Hemminger132adf52007-03-08 20:44:43 -0800884 goto mc_msf_out;
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700885
Stephen Hemminger132adf52007-03-08 20:44:43 -0800886 /* numsrc >= (4G-140)/128 overflow in 32 bits */
887 if (gsf->gf_numsrc >= 0x1ffffff ||
888 gsf->gf_numsrc > sysctl_igmp_max_msf) {
889 err = -ENOBUFS;
890 goto mc_msf_out;
891 }
892 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
893 err = -EINVAL;
894 goto mc_msf_out;
895 }
896 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
Jianjun Kong09cb1052008-11-03 00:27:11 -0800897 msf = kmalloc(msize, GFP_KERNEL);
Stephen Hemmingercfcabdc2007-10-09 01:59:42 -0700898 if (!msf) {
Stephen Hemminger132adf52007-03-08 20:44:43 -0800899 err = -ENOBUFS;
900 goto mc_msf_out;
901 }
902 ifindex = gsf->gf_interface;
903 psin = (struct sockaddr_in *)&gsf->gf_group;
904 if (psin->sin_family != AF_INET) {
905 err = -EADDRNOTAVAIL;
906 goto mc_msf_out;
907 }
908 msf->imsf_multiaddr = psin->sin_addr.s_addr;
909 msf->imsf_interface = 0;
910 msf->imsf_fmode = gsf->gf_fmode;
911 msf->imsf_numsrc = gsf->gf_numsrc;
912 err = -EADDRNOTAVAIL;
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700913 for (i = 0; i < gsf->gf_numsrc; ++i) {
Stephen Hemminger132adf52007-03-08 20:44:43 -0800914 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
915
916 if (psin->sin_family != AF_INET)
917 goto mc_msf_out;
918 msf->imsf_slist[i] = psin->sin_addr.s_addr;
919 }
920 kfree(gsf);
921 gsf = NULL;
922
923 err = ip_mc_msfilter(sk, msf, ifindex);
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700924mc_msf_out:
Stephen Hemminger132adf52007-03-08 20:44:43 -0800925 kfree(msf);
926 kfree(gsf);
927 break;
928 }
Nivedita Singhvif771bef2009-05-28 07:00:46 +0000929 case IP_MULTICAST_ALL:
930 if (optlen < 1)
931 goto e_inval;
932 if (val != 0 && val != 1)
933 goto e_inval;
934 inet->mc_all = val;
935 break;
Stephen Hemminger132adf52007-03-08 20:44:43 -0800936 case IP_ROUTER_ALERT:
937 err = ip_ra_control(sk, val ? 1 : 0, NULL);
938 break;
939
940 case IP_FREEBIND:
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700941 if (optlen < 1)
Stephen Hemminger132adf52007-03-08 20:44:43 -0800942 goto e_inval;
943 inet->freebind = !!val;
944 break;
945
946 case IP_IPSEC_POLICY:
947 case IP_XFRM_POLICY:
948 err = -EPERM;
949 if (!capable(CAP_NET_ADMIN))
950 break;
951 err = xfrm_user_policy(sk, optname, optval, optlen);
952 break;
953
KOVACS Krisztianf5715ae2008-10-01 07:30:02 -0700954 case IP_TRANSPARENT:
955 if (!capable(CAP_NET_ADMIN)) {
956 err = -EPERM;
957 break;
958 }
959 if (optlen < 1)
960 goto e_inval;
961 inet->transparent = !!val;
962 break;
963
Stephen Hemmingerd218d112010-01-11 16:28:01 -0800964 case IP_MINTTL:
965 if (optlen < 1)
966 goto e_inval;
967 if (val < 0 || val > 255)
968 goto e_inval;
969 inet->min_ttl = val;
970 break;
971
Stephen Hemminger132adf52007-03-08 20:44:43 -0800972 default:
973 err = -ENOPROTOOPT;
974 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975 }
976 release_sock(sk);
977 return err;
978
979e_inval:
980 release_sock(sk);
981 return -EINVAL;
982}
983
Eric Dumazetf84af322010-04-28 15:31:51 -0700984/**
985 * ip_queue_rcv_skb - Queue an skb into sock receive queue
986 * @sk: socket
987 * @skb: buffer
988 *
989 * Queues an skb into socket receive queue. If IP_CMSG_PKTINFO option
990 * is not set, we drop skb dst entry now, while dst cache line is hot.
991 */
992int ip_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
993{
994 if (!(inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO))
995 skb_dst_drop(skb);
996 return sock_queue_rcv_skb(sk, skb);
997}
998EXPORT_SYMBOL(ip_queue_rcv_skb);
999
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001000int ip_setsockopt(struct sock *sk, int level,
David S. Millerb7058842009-09-30 16:12:20 -07001001 int optname, char __user *optval, unsigned int optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001002{
1003 int err;
1004
1005 if (level != SOL_IP)
1006 return -ENOPROTOOPT;
1007
1008 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1009#ifdef CONFIG_NETFILTER
1010 /* we need to exclude all possible ENOPROTOOPTs except default case */
1011 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
Pavel Emelyanov6a9fb942007-11-05 21:32:31 -08001012 optname != IP_IPSEC_POLICY &&
1013 optname != IP_XFRM_POLICY &&
1014 !ip_mroute_opt(optname)) {
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001015 lock_sock(sk);
1016 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
1017 release_sock(sk);
1018 }
1019#endif
1020 return err;
1021}
Eric Dumazet4d52cfb2009-06-02 00:42:16 -07001022EXPORT_SYMBOL(ip_setsockopt);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001023
1024#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001025int compat_ip_setsockopt(struct sock *sk, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -07001026 char __user *optval, unsigned int optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001027{
1028 int err;
1029
1030 if (level != SOL_IP)
1031 return -ENOPROTOOPT;
1032
David L Stevensdae50292008-04-27 01:06:07 -07001033 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
1034 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
1035 ip_setsockopt);
1036
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001037 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1038#ifdef CONFIG_NETFILTER
1039 /* we need to exclude all possible ENOPROTOOPTs except default case */
1040 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
Pavel Emelyanov6a9fb942007-11-05 21:32:31 -08001041 optname != IP_IPSEC_POLICY &&
1042 optname != IP_XFRM_POLICY &&
1043 !ip_mroute_opt(optname)) {
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001044 lock_sock(sk);
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001045 err = compat_nf_setsockopt(sk, PF_INET, optname,
1046 optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001047 release_sock(sk);
1048 }
1049#endif
1050 return err;
1051}
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001052EXPORT_SYMBOL(compat_ip_setsockopt);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001053#endif
1054
Linus Torvalds1da177e2005-04-16 15:20:36 -07001055/*
Eric Dumazet4d52cfb2009-06-02 00:42:16 -07001056 * Get the options. Note for future reference. The GET of IP options gets
1057 * the _received_ ones. The set sets the _sent_ ones.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001058 */
1059
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001060static int do_ip_getsockopt(struct sock *sk, int level, int optname,
Stephen Hemminger132adf52007-03-08 20:44:43 -08001061 char __user *optval, int __user *optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001062{
1063 struct inet_sock *inet = inet_sk(sk);
1064 int val;
1065 int len;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001066
Stephen Hemminger132adf52007-03-08 20:44:43 -08001067 if (level != SOL_IP)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068 return -EOPNOTSUPP;
1069
Pavel Emelyanov6a9fb942007-11-05 21:32:31 -08001070 if (ip_mroute_opt(optname))
Jianjun Kong09cb1052008-11-03 00:27:11 -08001071 return ip_mroute_getsockopt(sk, optname, optval, optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001072
Jianjun Kong09cb1052008-11-03 00:27:11 -08001073 if (get_user(len, optlen))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074 return -EFAULT;
Stephen Hemminger132adf52007-03-08 20:44:43 -08001075 if (len < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001076 return -EINVAL;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001077
Linus Torvalds1da177e2005-04-16 15:20:36 -07001078 lock_sock(sk);
1079
Stephen Hemminger132adf52007-03-08 20:44:43 -08001080 switch (optname) {
1081 case IP_OPTIONS:
1082 {
1083 unsigned char optbuf[sizeof(struct ip_options)+40];
Jianjun Kong09cb1052008-11-03 00:27:11 -08001084 struct ip_options * opt = (struct ip_options *)optbuf;
Stephen Hemminger132adf52007-03-08 20:44:43 -08001085 opt->optlen = 0;
1086 if (inet->opt)
1087 memcpy(optbuf, inet->opt,
1088 sizeof(struct ip_options)+
1089 inet->opt->optlen);
1090 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001091
Stephen Hemminger132adf52007-03-08 20:44:43 -08001092 if (opt->optlen == 0)
1093 return put_user(0, optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001094
Stephen Hemminger132adf52007-03-08 20:44:43 -08001095 ip_options_undo(opt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001096
Stephen Hemminger132adf52007-03-08 20:44:43 -08001097 len = min_t(unsigned int, len, opt->optlen);
1098 if (put_user(len, optlen))
1099 return -EFAULT;
1100 if (copy_to_user(optval, opt->__data, len))
1101 return -EFAULT;
1102 return 0;
1103 }
1104 case IP_PKTINFO:
1105 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
1106 break;
1107 case IP_RECVTTL:
1108 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1109 break;
1110 case IP_RECVTOS:
1111 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1112 break;
1113 case IP_RECVOPTS:
1114 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1115 break;
1116 case IP_RETOPTS:
1117 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1118 break;
1119 case IP_PASSSEC:
1120 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1121 break;
Balazs Scheidlere8b2dfe2008-11-16 19:32:39 -08001122 case IP_RECVORIGDSTADDR:
1123 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0;
1124 break;
Stephen Hemminger132adf52007-03-08 20:44:43 -08001125 case IP_TOS:
1126 val = inet->tos;
1127 break;
1128 case IP_TTL:
1129 val = (inet->uc_ttl == -1 ?
1130 sysctl_ip_default_ttl :
1131 inet->uc_ttl);
1132 break;
1133 case IP_HDRINCL:
1134 val = inet->hdrincl;
1135 break;
Michael Kerriska89b4762010-09-10 20:26:56 +00001136 case IP_NODEFRAG:
1137 val = inet->nodefrag;
1138 break;
Stephen Hemminger132adf52007-03-08 20:44:43 -08001139 case IP_MTU_DISCOVER:
1140 val = inet->pmtudisc;
1141 break;
1142 case IP_MTU:
1143 {
1144 struct dst_entry *dst;
1145 val = 0;
1146 dst = sk_dst_get(sk);
1147 if (dst) {
1148 val = dst_mtu(dst);
1149 dst_release(dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001150 }
Stephen Hemminger132adf52007-03-08 20:44:43 -08001151 if (!val) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152 release_sock(sk);
Stephen Hemminger132adf52007-03-08 20:44:43 -08001153 return -ENOTCONN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001154 }
Stephen Hemminger132adf52007-03-08 20:44:43 -08001155 break;
1156 }
1157 case IP_RECVERR:
1158 val = inet->recverr;
1159 break;
1160 case IP_MULTICAST_TTL:
1161 val = inet->mc_ttl;
1162 break;
1163 case IP_MULTICAST_LOOP:
1164 val = inet->mc_loop;
1165 break;
1166 case IP_MULTICAST_IF:
1167 {
1168 struct in_addr addr;
1169 len = min_t(unsigned int, len, sizeof(struct in_addr));
1170 addr.s_addr = inet->mc_addr;
1171 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001172
Stephen Hemminger132adf52007-03-08 20:44:43 -08001173 if (put_user(len, optlen))
1174 return -EFAULT;
1175 if (copy_to_user(optval, &addr, len))
1176 return -EFAULT;
1177 return 0;
1178 }
1179 case IP_MSFILTER:
1180 {
1181 struct ip_msfilter msf;
1182 int err;
1183
1184 if (len < IP_MSFILTER_SIZE(0)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001185 release_sock(sk);
Stephen Hemminger132adf52007-03-08 20:44:43 -08001186 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001187 }
Stephen Hemminger132adf52007-03-08 20:44:43 -08001188 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001189 release_sock(sk);
Stephen Hemminger132adf52007-03-08 20:44:43 -08001190 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001191 }
Stephen Hemminger132adf52007-03-08 20:44:43 -08001192 err = ip_mc_msfget(sk, &msf,
1193 (struct ip_msfilter __user *)optval, optlen);
1194 release_sock(sk);
1195 return err;
1196 }
1197 case MCAST_MSFILTER:
1198 {
1199 struct group_filter gsf;
1200 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001201
Stephen Hemminger132adf52007-03-08 20:44:43 -08001202 if (len < GROUP_FILTER_SIZE(0)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203 release_sock(sk);
Stephen Hemminger132adf52007-03-08 20:44:43 -08001204 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205 }
Stephen Hemminger132adf52007-03-08 20:44:43 -08001206 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207 release_sock(sk);
Stephen Hemminger132adf52007-03-08 20:44:43 -08001208 return -EFAULT;
1209 }
1210 err = ip_mc_gsfget(sk, &gsf,
Eric Dumazet4d52cfb2009-06-02 00:42:16 -07001211 (struct group_filter __user *)optval,
1212 optlen);
Stephen Hemminger132adf52007-03-08 20:44:43 -08001213 release_sock(sk);
1214 return err;
1215 }
Nivedita Singhvif771bef2009-05-28 07:00:46 +00001216 case IP_MULTICAST_ALL:
1217 val = inet->mc_all;
1218 break;
Stephen Hemminger132adf52007-03-08 20:44:43 -08001219 case IP_PKTOPTIONS:
1220 {
1221 struct msghdr msg;
1222
1223 release_sock(sk);
1224
1225 if (sk->sk_type != SOCK_STREAM)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001226 return -ENOPROTOOPT;
Stephen Hemminger132adf52007-03-08 20:44:43 -08001227
1228 msg.msg_control = optval;
1229 msg.msg_controllen = len;
1230 msg.msg_flags = 0;
1231
1232 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1233 struct in_pktinfo info;
1234
Eric Dumazetc720c7e2009-10-15 06:30:45 +00001235 info.ipi_addr.s_addr = inet->inet_rcv_saddr;
1236 info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr;
Stephen Hemminger132adf52007-03-08 20:44:43 -08001237 info.ipi_ifindex = inet->mc_index;
1238 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1239 }
1240 if (inet->cmsg_flags & IP_CMSG_TTL) {
1241 int hlim = inet->mc_ttl;
1242 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1243 }
1244 len -= msg.msg_controllen;
1245 return put_user(len, optlen);
1246 }
1247 case IP_FREEBIND:
1248 val = inet->freebind;
1249 break;
KOVACS Krisztianf5715ae2008-10-01 07:30:02 -07001250 case IP_TRANSPARENT:
1251 val = inet->transparent;
1252 break;
Stephen Hemmingerd218d112010-01-11 16:28:01 -08001253 case IP_MINTTL:
1254 val = inet->min_ttl;
1255 break;
Stephen Hemminger132adf52007-03-08 20:44:43 -08001256 default:
1257 release_sock(sk);
1258 return -ENOPROTOOPT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001259 }
1260 release_sock(sk);
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001261
Eric Dumazet4d52cfb2009-06-02 00:42:16 -07001262 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001263 unsigned char ucval = (unsigned char)val;
1264 len = 1;
Stephen Hemminger132adf52007-03-08 20:44:43 -08001265 if (put_user(len, optlen))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001266 return -EFAULT;
Jianjun Kong09cb1052008-11-03 00:27:11 -08001267 if (copy_to_user(optval, &ucval, 1))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001268 return -EFAULT;
1269 } else {
1270 len = min_t(unsigned int, sizeof(int), len);
Stephen Hemminger132adf52007-03-08 20:44:43 -08001271 if (put_user(len, optlen))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001272 return -EFAULT;
Jianjun Kong09cb1052008-11-03 00:27:11 -08001273 if (copy_to_user(optval, &val, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001274 return -EFAULT;
1275 }
1276 return 0;
1277}
1278
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001279int ip_getsockopt(struct sock *sk, int level,
Stephen Hemminger132adf52007-03-08 20:44:43 -08001280 int optname, char __user *optval, int __user *optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001281{
1282 int err;
1283
1284 err = do_ip_getsockopt(sk, level, optname, optval, optlen);
1285#ifdef CONFIG_NETFILTER
1286 /* we need to exclude all possible ENOPROTOOPTs except default case */
Pavel Emelyanov6a9fb942007-11-05 21:32:31 -08001287 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1288 !ip_mroute_opt(optname)) {
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001289 int len;
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001290
Jianjun Kong09cb1052008-11-03 00:27:11 -08001291 if (get_user(len, optlen))
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001292 return -EFAULT;
1293
1294 lock_sock(sk);
1295 err = nf_getsockopt(sk, PF_INET, optname, optval,
1296 &len);
1297 release_sock(sk);
1298 if (err >= 0)
1299 err = put_user(len, optlen);
1300 return err;
1301 }
1302#endif
1303 return err;
1304}
Eric Dumazet4d52cfb2009-06-02 00:42:16 -07001305EXPORT_SYMBOL(ip_getsockopt);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001306
1307#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001308int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1309 char __user *optval, int __user *optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001310{
David L Stevens42908c62008-04-29 03:23:22 -07001311 int err;
1312
1313 if (optname == MCAST_MSFILTER)
1314 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1315 ip_getsockopt);
1316
1317 err = do_ip_getsockopt(sk, level, optname, optval, optlen);
1318
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001319#ifdef CONFIG_NETFILTER
1320 /* we need to exclude all possible ENOPROTOOPTs except default case */
Pavel Emelyanov6a9fb942007-11-05 21:32:31 -08001321 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1322 !ip_mroute_opt(optname)) {
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001323 int len;
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001324
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001325 if (get_user(len, optlen))
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001326 return -EFAULT;
1327
1328 lock_sock(sk);
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001329 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001330 release_sock(sk);
1331 if (err >= 0)
1332 err = put_user(len, optlen);
1333 return err;
1334 }
1335#endif
1336 return err;
1337}
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001338EXPORT_SYMBOL(compat_ip_getsockopt);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001339#endif