blob: 82817e5543638e93299e017262693da28bf1bff8 [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 * Version: $Id: ip_sockglue.c,v 1.62 2002/02/01 22:01:04 davem Exp $
9 *
10 * Authors: see ip.c
11 *
12 * Fixes:
13 * Many : Split from ip.c , see ip.c for history.
14 * Martin Mares : TOS setting fixed.
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +090015 * Alan Cox : Fixed a couple of oopses in Martin's
Linus Torvalds1da177e2005-04-16 15:20:36 -070016 * TOS tweaks.
17 * Mike McLagan : Routing by source
18 */
19
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include <linux/module.h>
21#include <linux/types.h>
22#include <linux/mm.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <linux/skbuff.h>
24#include <linux/ip.h>
25#include <linux/icmp.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020026#include <linux/inetdevice.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include <linux/netdevice.h>
28#include <net/sock.h>
29#include <net/ip.h>
30#include <net/icmp.h>
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -080031#include <net/tcp_states.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#include <linux/udp.h>
33#include <linux/igmp.h>
34#include <linux/netfilter.h>
35#include <linux/route.h>
36#include <linux/mroute.h>
37#include <net/route.h>
38#include <net/xfrm.h>
39#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
Linus Torvalds1da177e2005-04-16 15:20:36 -070052
53/*
54 * SOL_IP control messages.
55 */
56
57static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
58{
59 struct in_pktinfo info;
60 struct rtable *rt = (struct rtable *)skb->dst;
61
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -070062 info.ipi_addr.s_addr = ip_hdr(skb)->daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 if (rt) {
64 info.ipi_ifindex = rt->rt_iif;
65 info.ipi_spec_dst.s_addr = rt->rt_spec_dst;
66 } else {
67 info.ipi_ifindex = 0;
68 info.ipi_spec_dst.s_addr = 0;
69 }
70
71 put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
72}
73
74static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
75{
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -070076 int ttl = ip_hdr(skb)->ttl;
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
78}
79
80static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
81{
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -070082 put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos);
Linus Torvalds1da177e2005-04-16 15:20:36 -070083}
84
85static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
86{
87 if (IPCB(skb)->opt.optlen == 0)
88 return;
89
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -070090 put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen,
91 ip_hdr(skb) + 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -070092}
93
94
95static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb)
96{
97 unsigned char optbuf[sizeof(struct ip_options) + 40];
98 struct ip_options * opt = (struct ip_options*)optbuf;
99
100 if (IPCB(skb)->opt.optlen == 0)
101 return;
102
103 if (ip_options_echo(opt, skb)) {
104 msg->msg_flags |= MSG_CTRUNC;
105 return;
106 }
107 ip_options_undo(opt);
108
109 put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data);
110}
111
Catherine Zhang2c7946a2006-03-20 22:41:23 -0800112static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
113{
114 char *secdata;
Catherine Zhangdc49c1f2006-08-02 14:12:06 -0700115 u32 seclen, secid;
Catherine Zhang2c7946a2006-03-20 22:41:23 -0800116 int err;
117
Catherine Zhangdc49c1f2006-08-02 14:12:06 -0700118 err = security_socket_getpeersec_dgram(NULL, skb, &secid);
119 if (err)
120 return;
121
122 err = security_secid_to_secctx(secid, &secdata, &seclen);
Catherine Zhang2c7946a2006-03-20 22:41:23 -0800123 if (err)
124 return;
125
126 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
Catherine Zhangdc49c1f2006-08-02 14:12:06 -0700127 security_release_secctx(secdata, seclen);
Catherine Zhang2c7946a2006-03-20 22:41:23 -0800128}
129
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130
131void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
132{
133 struct inet_sock *inet = inet_sk(skb->sk);
134 unsigned flags = inet->cmsg_flags;
135
136 /* Ordered by supposed usage frequency */
137 if (flags & 1)
138 ip_cmsg_recv_pktinfo(msg, skb);
139 if ((flags>>=1) == 0)
140 return;
141
142 if (flags & 1)
143 ip_cmsg_recv_ttl(msg, skb);
144 if ((flags>>=1) == 0)
145 return;
146
147 if (flags & 1)
148 ip_cmsg_recv_tos(msg, skb);
149 if ((flags>>=1) == 0)
150 return;
151
152 if (flags & 1)
153 ip_cmsg_recv_opts(msg, skb);
154 if ((flags>>=1) == 0)
155 return;
156
157 if (flags & 1)
158 ip_cmsg_recv_retopts(msg, skb);
Catherine Zhang2c7946a2006-03-20 22:41:23 -0800159 if ((flags>>=1) == 0)
160 return;
161
162 if (flags & 1)
163 ip_cmsg_recv_security(msg, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164}
165
166int ip_cmsg_send(struct msghdr *msg, struct ipcm_cookie *ipc)
167{
168 int err;
169 struct cmsghdr *cmsg;
170
171 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
172 if (!CMSG_OK(msg, cmsg))
173 return -EINVAL;
174 if (cmsg->cmsg_level != SOL_IP)
175 continue;
176 switch (cmsg->cmsg_type) {
177 case IP_RETOPTS:
178 err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
Arnaldo Carvalho de Melo4c6ea292005-08-16 19:46:48 -0300179 err = ip_options_get(&ipc->opt, CMSG_DATA(cmsg), err < 40 ? err : 40);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 if (err)
181 return err;
182 break;
183 case IP_PKTINFO:
184 {
185 struct in_pktinfo *info;
186 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
187 return -EINVAL;
188 info = (struct in_pktinfo *)CMSG_DATA(cmsg);
189 ipc->oif = info->ipi_ifindex;
190 ipc->addr = info->ipi_spec_dst.s_addr;
191 break;
192 }
193 default:
194 return -EINVAL;
195 }
196 }
197 return 0;
198}
199
200
201/* Special input handler for packets caught by router alert option.
202 They are selected only by protocol field, and then processed likely
203 local ones; but only if someone wants them! Otherwise, router
204 not running rsvpd will kill RSVP.
205
206 It is user level problem, what it will make with them.
207 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
208 but receiver should be enough clever f.e. to forward mtrace requests,
209 sent to multicast group to reach destination designated router.
210 */
211struct ip_ra_chain *ip_ra_chain;
212DEFINE_RWLOCK(ip_ra_lock);
213
214int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *))
215{
216 struct ip_ra_chain *ra, *new_ra, **rap;
217
218 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num == IPPROTO_RAW)
219 return -EINVAL;
220
221 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
222
223 write_lock_bh(&ip_ra_lock);
224 for (rap = &ip_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
225 if (ra->sk == sk) {
226 if (on) {
227 write_unlock_bh(&ip_ra_lock);
Jesper Juhla51482b2005-11-08 09:41:34 -0800228 kfree(new_ra);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 return -EADDRINUSE;
230 }
231 *rap = ra->next;
232 write_unlock_bh(&ip_ra_lock);
233
234 if (ra->destructor)
235 ra->destructor(sk);
236 sock_put(sk);
237 kfree(ra);
238 return 0;
239 }
240 }
241 if (new_ra == NULL) {
242 write_unlock_bh(&ip_ra_lock);
243 return -ENOBUFS;
244 }
245 new_ra->sk = sk;
246 new_ra->destructor = destructor;
247
248 new_ra->next = ra;
249 *rap = new_ra;
250 sock_hold(sk);
251 write_unlock_bh(&ip_ra_lock);
252
253 return 0;
254}
255
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900256void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
Al Viro35986b32006-09-27 18:34:21 -0700257 __be16 port, u32 info, u8 *payload)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258{
259 struct inet_sock *inet = inet_sk(sk);
260 struct sock_exterr_skb *serr;
261
262 if (!inet->recverr)
263 return;
264
265 skb = skb_clone(skb, GFP_ATOMIC);
266 if (!skb)
267 return;
268
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900269 serr = SKB_EXT_ERR(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 serr->ee.ee_errno = err;
271 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
Arnaldo Carvalho de Melo88c76642007-03-13 14:43:18 -0300272 serr->ee.ee_type = icmp_hdr(skb)->type;
273 serr->ee.ee_code = icmp_hdr(skb)->code;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 serr->ee.ee_pad = 0;
275 serr->ee.ee_info = info;
276 serr->ee.ee_data = 0;
Arnaldo Carvalho de Melo88c76642007-03-13 14:43:18 -0300277 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700278 skb_network_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 serr->port = port;
280
Arnaldo Carvalho de Melobd823932007-03-13 17:10:43 -0300281 if (skb_pull(skb, payload - skb->data) != NULL) {
282 skb_reset_transport_header(skb);
283 if (sock_queue_err_skb(sk, skb) == 0)
284 return;
285 }
286 kfree_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287}
288
Al Viro05790162006-09-27 18:33:40 -0700289void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290{
291 struct inet_sock *inet = inet_sk(sk);
292 struct sock_exterr_skb *serr;
293 struct iphdr *iph;
294 struct sk_buff *skb;
295
296 if (!inet->recverr)
297 return;
298
299 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
300 if (!skb)
301 return;
302
Arnaldo Carvalho de Melo2ca9e6f2007-03-10 19:15:25 -0300303 skb_put(skb, sizeof(struct iphdr));
304 skb_reset_network_header(skb);
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700305 iph = ip_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 iph->daddr = daddr;
307
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900308 serr = SKB_EXT_ERR(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 serr->ee.ee_errno = err;
310 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900311 serr->ee.ee_type = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 serr->ee.ee_code = 0;
313 serr->ee.ee_pad = 0;
314 serr->ee.ee_info = info;
315 serr->ee.ee_data = 0;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700316 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 serr->port = port;
318
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700319 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
Arnaldo Carvalho de Melobd823932007-03-13 17:10:43 -0300320 skb_reset_transport_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321
322 if (sock_queue_err_skb(sk, skb))
323 kfree_skb(skb);
324}
325
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900326/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 * Handle MSG_ERRQUEUE
328 */
329int ip_recv_error(struct sock *sk, struct msghdr *msg, int len)
330{
331 struct sock_exterr_skb *serr;
332 struct sk_buff *skb, *skb2;
333 struct sockaddr_in *sin;
334 struct {
335 struct sock_extended_err ee;
336 struct sockaddr_in offender;
337 } errhdr;
338 int err;
339 int copied;
340
341 err = -EAGAIN;
342 skb = skb_dequeue(&sk->sk_error_queue);
343 if (skb == NULL)
344 goto out;
345
346 copied = skb->len;
347 if (copied > len) {
348 msg->msg_flags |= MSG_TRUNC;
349 copied = len;
350 }
351 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
352 if (err)
353 goto out_free_skb;
354
355 sock_recv_timestamp(msg, sk, skb);
356
357 serr = SKB_EXT_ERR(skb);
358
359 sin = (struct sockaddr_in *)msg->msg_name;
360 if (sin) {
361 sin->sin_family = AF_INET;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700362 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
363 serr->addr_offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 sin->sin_port = serr->port;
365 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
366 }
367
368 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
369 sin = &errhdr.offender;
370 sin->sin_family = AF_UNSPEC;
371 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
372 struct inet_sock *inet = inet_sk(sk);
373
374 sin->sin_family = AF_INET;
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700375 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 sin->sin_port = 0;
377 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
378 if (inet->cmsg_flags)
379 ip_cmsg_recv(msg, skb);
380 }
381
382 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
383
384 /* Now we could try to dump offended packet options */
385
386 msg->msg_flags |= MSG_ERRQUEUE;
387 err = copied;
388
389 /* Reset and regenerate socket error */
Herbert Xue0f9f852005-06-18 22:56:18 -0700390 spin_lock_bh(&sk->sk_error_queue.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391 sk->sk_err = 0;
392 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
393 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
Herbert Xue0f9f852005-06-18 22:56:18 -0700394 spin_unlock_bh(&sk->sk_error_queue.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 sk->sk_error_report(sk);
396 } else
Herbert Xue0f9f852005-06-18 22:56:18 -0700397 spin_unlock_bh(&sk->sk_error_queue.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900399out_free_skb:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 kfree_skb(skb);
401out:
402 return err;
403}
404
405
406/*
407 * Socket option code for IP. This is the end of the line after any TCP,UDP etc options on
408 * an IP socket.
409 */
410
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800411static int do_ip_setsockopt(struct sock *sk, int level,
Stephen Hemminger132adf52007-03-08 20:44:43 -0800412 int optname, char __user *optval, int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413{
414 struct inet_sock *inet = inet_sk(sk);
415 int val=0,err;
416
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900417 if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) |
Stephen Hemminger132adf52007-03-08 20:44:43 -0800418 (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) |
419 (1<<IP_RETOPTS) | (1<<IP_TOS) |
420 (1<<IP_TTL) | (1<<IP_HDRINCL) |
421 (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) |
422 (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) |
423 (1<<IP_PASSSEC))) ||
424 optname == IP_MULTICAST_TTL ||
425 optname == IP_MULTICAST_LOOP) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 if (optlen >= sizeof(int)) {
427 if (get_user(val, (int __user *) optval))
428 return -EFAULT;
429 } else if (optlen >= sizeof(char)) {
430 unsigned char ucval;
431
432 if (get_user(ucval, (unsigned char __user *) optval))
433 return -EFAULT;
434 val = (int) ucval;
435 }
436 }
437
438 /* If optlen==0, it is equivalent to val == 0 */
439
Pavel Emelyanov6a9fb942007-11-05 21:32:31 -0800440 if (ip_mroute_opt(optname))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 return ip_mroute_setsockopt(sk,optname,optval,optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442
443 err = 0;
444 lock_sock(sk);
445
446 switch (optname) {
Stephen Hemminger132adf52007-03-08 20:44:43 -0800447 case IP_OPTIONS:
448 {
449 struct ip_options * opt = NULL;
450 if (optlen > 40 || optlen < 0)
451 goto e_inval;
452 err = ip_options_get_from_user(&opt, optval, optlen);
453 if (err)
454 break;
455 if (inet->is_icsk) {
456 struct inet_connection_sock *icsk = inet_csk(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
Stephen Hemminger132adf52007-03-08 20:44:43 -0800458 if (sk->sk_family == PF_INET ||
459 (!((1 << sk->sk_state) &
460 (TCPF_LISTEN | TCPF_CLOSE)) &&
461 inet->daddr != LOOPBACK4_IPV6)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462#endif
Stephen Hemminger132adf52007-03-08 20:44:43 -0800463 if (inet->opt)
464 icsk->icsk_ext_hdr_len -= inet->opt->optlen;
465 if (opt)
466 icsk->icsk_ext_hdr_len += opt->optlen;
467 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
Stephen Hemminger132adf52007-03-08 20:44:43 -0800469 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 }
Stephen Hemminger132adf52007-03-08 20:44:43 -0800472 opt = xchg(&inet->opt, opt);
473 kfree(opt);
474 break;
475 }
476 case IP_PKTINFO:
477 if (val)
478 inet->cmsg_flags |= IP_CMSG_PKTINFO;
479 else
480 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
481 break;
482 case IP_RECVTTL:
483 if (val)
484 inet->cmsg_flags |= IP_CMSG_TTL;
485 else
486 inet->cmsg_flags &= ~IP_CMSG_TTL;
487 break;
488 case IP_RECVTOS:
489 if (val)
490 inet->cmsg_flags |= IP_CMSG_TOS;
491 else
492 inet->cmsg_flags &= ~IP_CMSG_TOS;
493 break;
494 case IP_RECVOPTS:
495 if (val)
496 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
497 else
498 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
499 break;
500 case IP_RETOPTS:
501 if (val)
502 inet->cmsg_flags |= IP_CMSG_RETOPTS;
503 else
504 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
505 break;
506 case IP_PASSSEC:
507 if (val)
508 inet->cmsg_flags |= IP_CMSG_PASSSEC;
509 else
510 inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
511 break;
512 case IP_TOS: /* This sets both TOS and Precedence */
513 if (sk->sk_type == SOCK_STREAM) {
514 val &= ~3;
515 val |= inet->tos & 3;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 }
Stephen Hemminger132adf52007-03-08 20:44:43 -0800517 if (IPTOS_PREC(val) >= IPTOS_PREC_CRITIC_ECP &&
518 !capable(CAP_NET_ADMIN)) {
Herbert Xu6fc0b4a2005-08-06 06:33:15 -0700519 err = -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 break;
Stephen Hemminger132adf52007-03-08 20:44:43 -0800521 }
522 if (inet->tos != val) {
523 inet->tos = val;
524 sk->sk_priority = rt_tos2priority(val);
525 sk_dst_reset(sk);
526 }
527 break;
528 case IP_TTL:
529 if (optlen<1)
530 goto e_inval;
531 if (val != -1 && (val < 1 || val>255))
532 goto e_inval;
533 inet->uc_ttl = val;
534 break;
535 case IP_HDRINCL:
536 if (sk->sk_type != SOCK_RAW) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537 err = -ENOPROTOOPT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 break;
Stephen Hemminger132adf52007-03-08 20:44:43 -0800539 }
540 inet->hdrincl = val ? 1 : 0;
541 break;
542 case IP_MTU_DISCOVER:
John Heffner628a5c52007-04-20 15:53:27 -0700543 if (val<0 || val>3)
Stephen Hemminger132adf52007-03-08 20:44:43 -0800544 goto e_inval;
545 inet->pmtudisc = val;
546 break;
547 case IP_RECVERR:
548 inet->recverr = !!val;
549 if (!val)
550 skb_queue_purge(&sk->sk_error_queue);
551 break;
552 case IP_MULTICAST_TTL:
553 if (sk->sk_type == SOCK_STREAM)
554 goto e_inval;
555 if (optlen<1)
556 goto e_inval;
557 if (val==-1)
558 val = 1;
559 if (val < 0 || val > 255)
560 goto e_inval;
561 inet->mc_ttl = val;
562 break;
563 case IP_MULTICAST_LOOP:
564 if (optlen<1)
565 goto e_inval;
566 inet->mc_loop = !!val;
567 break;
568 case IP_MULTICAST_IF:
569 {
570 struct ip_mreqn mreq;
571 struct net_device *dev = NULL;
572
573 if (sk->sk_type == SOCK_STREAM)
574 goto e_inval;
575 /*
576 * Check the arguments are allowable
577 */
578
579 err = -EFAULT;
580 if (optlen >= sizeof(struct ip_mreqn)) {
581 if (copy_from_user(&mreq,optval,sizeof(mreq)))
582 break;
583 } else {
584 memset(&mreq, 0, sizeof(mreq));
585 if (optlen >= sizeof(struct in_addr) &&
586 copy_from_user(&mreq.imr_address,optval,sizeof(struct in_addr)))
587 break;
588 }
589
590 if (!mreq.imr_ifindex) {
591 if (mreq.imr_address.s_addr == INADDR_ANY) {
592 inet->mc_index = 0;
593 inet->mc_addr = 0;
594 err = 0;
595 break;
596 }
597 dev = ip_dev_find(mreq.imr_address.s_addr);
598 if (dev) {
599 mreq.imr_ifindex = dev->ifindex;
600 dev_put(dev);
601 }
602 } else
Eric W. Biederman881d9662007-09-17 11:56:21 -0700603 dev = __dev_get_by_index(&init_net, mreq.imr_ifindex);
Stephen Hemminger132adf52007-03-08 20:44:43 -0800604
605
606 err = -EADDRNOTAVAIL;
607 if (!dev)
608 break;
609
610 err = -EINVAL;
611 if (sk->sk_bound_dev_if &&
612 mreq.imr_ifindex != sk->sk_bound_dev_if)
613 break;
614
615 inet->mc_index = mreq.imr_ifindex;
616 inet->mc_addr = mreq.imr_address.s_addr;
617 err = 0;
618 break;
619 }
620
621 case IP_ADD_MEMBERSHIP:
622 case IP_DROP_MEMBERSHIP:
623 {
624 struct ip_mreqn mreq;
625
Flavio Leitnera96fb492007-08-24 22:16:39 -0700626 err = -EPROTO;
627 if (inet_sk(sk)->is_icsk)
628 break;
629
Stephen Hemminger132adf52007-03-08 20:44:43 -0800630 if (optlen < sizeof(struct ip_mreq))
631 goto e_inval;
632 err = -EFAULT;
633 if (optlen >= sizeof(struct ip_mreqn)) {
634 if (copy_from_user(&mreq,optval,sizeof(mreq)))
635 break;
636 } else {
637 memset(&mreq, 0, sizeof(mreq));
638 if (copy_from_user(&mreq,optval,sizeof(struct ip_mreq)))
639 break;
640 }
641
642 if (optname == IP_ADD_MEMBERSHIP)
643 err = ip_mc_join_group(sk, &mreq);
644 else
645 err = ip_mc_leave_group(sk, &mreq);
646 break;
647 }
648 case IP_MSFILTER:
649 {
650 extern int sysctl_igmp_max_msf;
651 struct ip_msfilter *msf;
652
653 if (optlen < IP_MSFILTER_SIZE(0))
654 goto e_inval;
655 if (optlen > sysctl_optmem_max) {
656 err = -ENOBUFS;
657 break;
658 }
659 msf = kmalloc(optlen, GFP_KERNEL);
Stephen Hemmingercfcabdc2007-10-09 01:59:42 -0700660 if (!msf) {
Stephen Hemminger132adf52007-03-08 20:44:43 -0800661 err = -ENOBUFS;
662 break;
663 }
664 err = -EFAULT;
665 if (copy_from_user(msf, optval, optlen)) {
666 kfree(msf);
667 break;
668 }
669 /* numsrc >= (1G-4) overflow in 32 bits */
670 if (msf->imsf_numsrc >= 0x3ffffffcU ||
671 msf->imsf_numsrc > sysctl_igmp_max_msf) {
672 kfree(msf);
673 err = -ENOBUFS;
674 break;
675 }
676 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
677 kfree(msf);
678 err = -EINVAL;
679 break;
680 }
681 err = ip_mc_msfilter(sk, msf, 0);
682 kfree(msf);
683 break;
684 }
685 case IP_BLOCK_SOURCE:
686 case IP_UNBLOCK_SOURCE:
687 case IP_ADD_SOURCE_MEMBERSHIP:
688 case IP_DROP_SOURCE_MEMBERSHIP:
689 {
690 struct ip_mreq_source mreqs;
691 int omode, add;
692
693 if (optlen != sizeof(struct ip_mreq_source))
694 goto e_inval;
695 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
696 err = -EFAULT;
697 break;
698 }
699 if (optname == IP_BLOCK_SOURCE) {
700 omode = MCAST_EXCLUDE;
701 add = 1;
702 } else if (optname == IP_UNBLOCK_SOURCE) {
703 omode = MCAST_EXCLUDE;
704 add = 0;
705 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
706 struct ip_mreqn mreq;
707
708 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
709 mreq.imr_address.s_addr = mreqs.imr_interface;
710 mreq.imr_ifindex = 0;
711 err = ip_mc_join_group(sk, &mreq);
712 if (err && err != -EADDRINUSE)
713 break;
714 omode = MCAST_INCLUDE;
715 add = 1;
716 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
717 omode = MCAST_INCLUDE;
718 add = 0;
719 }
720 err = ip_mc_source(add, omode, sk, &mreqs, 0);
721 break;
722 }
723 case MCAST_JOIN_GROUP:
724 case MCAST_LEAVE_GROUP:
725 {
726 struct group_req greq;
727 struct sockaddr_in *psin;
728 struct ip_mreqn mreq;
729
730 if (optlen < sizeof(struct group_req))
731 goto e_inval;
732 err = -EFAULT;
733 if (copy_from_user(&greq, optval, sizeof(greq)))
734 break;
735 psin = (struct sockaddr_in *)&greq.gr_group;
736 if (psin->sin_family != AF_INET)
737 goto e_inval;
738 memset(&mreq, 0, sizeof(mreq));
739 mreq.imr_multiaddr = psin->sin_addr;
740 mreq.imr_ifindex = greq.gr_interface;
741
742 if (optname == MCAST_JOIN_GROUP)
743 err = ip_mc_join_group(sk, &mreq);
744 else
745 err = ip_mc_leave_group(sk, &mreq);
746 break;
747 }
748 case MCAST_JOIN_SOURCE_GROUP:
749 case MCAST_LEAVE_SOURCE_GROUP:
750 case MCAST_BLOCK_SOURCE:
751 case MCAST_UNBLOCK_SOURCE:
752 {
753 struct group_source_req greqs;
754 struct ip_mreq_source mreqs;
755 struct sockaddr_in *psin;
756 int omode, add;
757
758 if (optlen != sizeof(struct group_source_req))
759 goto e_inval;
760 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
761 err = -EFAULT;
762 break;
763 }
764 if (greqs.gsr_group.ss_family != AF_INET ||
765 greqs.gsr_source.ss_family != AF_INET) {
766 err = -EADDRNOTAVAIL;
767 break;
768 }
769 psin = (struct sockaddr_in *)&greqs.gsr_group;
770 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
771 psin = (struct sockaddr_in *)&greqs.gsr_source;
772 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
773 mreqs.imr_interface = 0; /* use index for mc_source */
774
775 if (optname == MCAST_BLOCK_SOURCE) {
776 omode = MCAST_EXCLUDE;
777 add = 1;
778 } else if (optname == MCAST_UNBLOCK_SOURCE) {
779 omode = MCAST_EXCLUDE;
780 add = 0;
781 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
782 struct ip_mreqn mreq;
783
784 psin = (struct sockaddr_in *)&greqs.gsr_group;
785 mreq.imr_multiaddr = psin->sin_addr;
786 mreq.imr_address.s_addr = 0;
787 mreq.imr_ifindex = greqs.gsr_interface;
788 err = ip_mc_join_group(sk, &mreq);
789 if (err && err != -EADDRINUSE)
790 break;
791 greqs.gsr_interface = mreq.imr_ifindex;
792 omode = MCAST_INCLUDE;
793 add = 1;
794 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
795 omode = MCAST_INCLUDE;
796 add = 0;
797 }
798 err = ip_mc_source(add, omode, sk, &mreqs,
799 greqs.gsr_interface);
800 break;
801 }
802 case MCAST_MSFILTER:
803 {
804 extern int sysctl_igmp_max_msf;
805 struct sockaddr_in *psin;
806 struct ip_msfilter *msf = NULL;
807 struct group_filter *gsf = NULL;
808 int msize, i, ifindex;
809
810 if (optlen < GROUP_FILTER_SIZE(0))
811 goto e_inval;
812 if (optlen > sysctl_optmem_max) {
813 err = -ENOBUFS;
814 break;
815 }
816 gsf = kmalloc(optlen,GFP_KERNEL);
Stephen Hemmingercfcabdc2007-10-09 01:59:42 -0700817 if (!gsf) {
Stephen Hemminger132adf52007-03-08 20:44:43 -0800818 err = -ENOBUFS;
819 break;
820 }
821 err = -EFAULT;
822 if (copy_from_user(gsf, optval, optlen)) {
823 goto mc_msf_out;
824 }
825 /* numsrc >= (4G-140)/128 overflow in 32 bits */
826 if (gsf->gf_numsrc >= 0x1ffffff ||
827 gsf->gf_numsrc > sysctl_igmp_max_msf) {
828 err = -ENOBUFS;
829 goto mc_msf_out;
830 }
831 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
832 err = -EINVAL;
833 goto mc_msf_out;
834 }
835 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
836 msf = kmalloc(msize,GFP_KERNEL);
Stephen Hemmingercfcabdc2007-10-09 01:59:42 -0700837 if (!msf) {
Stephen Hemminger132adf52007-03-08 20:44:43 -0800838 err = -ENOBUFS;
839 goto mc_msf_out;
840 }
841 ifindex = gsf->gf_interface;
842 psin = (struct sockaddr_in *)&gsf->gf_group;
843 if (psin->sin_family != AF_INET) {
844 err = -EADDRNOTAVAIL;
845 goto mc_msf_out;
846 }
847 msf->imsf_multiaddr = psin->sin_addr.s_addr;
848 msf->imsf_interface = 0;
849 msf->imsf_fmode = gsf->gf_fmode;
850 msf->imsf_numsrc = gsf->gf_numsrc;
851 err = -EADDRNOTAVAIL;
852 for (i=0; i<gsf->gf_numsrc; ++i) {
853 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
854
855 if (psin->sin_family != AF_INET)
856 goto mc_msf_out;
857 msf->imsf_slist[i] = psin->sin_addr.s_addr;
858 }
859 kfree(gsf);
860 gsf = NULL;
861
862 err = ip_mc_msfilter(sk, msf, ifindex);
863 mc_msf_out:
864 kfree(msf);
865 kfree(gsf);
866 break;
867 }
868 case IP_ROUTER_ALERT:
869 err = ip_ra_control(sk, val ? 1 : 0, NULL);
870 break;
871
872 case IP_FREEBIND:
873 if (optlen<1)
874 goto e_inval;
875 inet->freebind = !!val;
876 break;
877
878 case IP_IPSEC_POLICY:
879 case IP_XFRM_POLICY:
880 err = -EPERM;
881 if (!capable(CAP_NET_ADMIN))
882 break;
883 err = xfrm_user_policy(sk, optname, optval, optlen);
884 break;
885
886 default:
887 err = -ENOPROTOOPT;
888 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889 }
890 release_sock(sk);
891 return err;
892
893e_inval:
894 release_sock(sk);
895 return -EINVAL;
896}
897
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800898int ip_setsockopt(struct sock *sk, int level,
899 int optname, char __user *optval, int optlen)
900{
901 int err;
902
903 if (level != SOL_IP)
904 return -ENOPROTOOPT;
905
906 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
907#ifdef CONFIG_NETFILTER
908 /* we need to exclude all possible ENOPROTOOPTs except default case */
909 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
Pavel Emelyanov6a9fb942007-11-05 21:32:31 -0800910 optname != IP_IPSEC_POLICY &&
911 optname != IP_XFRM_POLICY &&
912 !ip_mroute_opt(optname)) {
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800913 lock_sock(sk);
914 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
915 release_sock(sk);
916 }
917#endif
918 return err;
919}
920
921#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800922int compat_ip_setsockopt(struct sock *sk, int level, int optname,
923 char __user *optval, int optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800924{
925 int err;
926
927 if (level != SOL_IP)
928 return -ENOPROTOOPT;
929
930 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
931#ifdef CONFIG_NETFILTER
932 /* we need to exclude all possible ENOPROTOOPTs except default case */
933 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
Pavel Emelyanov6a9fb942007-11-05 21:32:31 -0800934 optname != IP_IPSEC_POLICY &&
935 optname != IP_XFRM_POLICY &&
936 !ip_mroute_opt(optname)) {
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800937 lock_sock(sk);
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800938 err = compat_nf_setsockopt(sk, PF_INET, optname,
939 optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800940 release_sock(sk);
941 }
942#endif
943 return err;
944}
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800945
946EXPORT_SYMBOL(compat_ip_setsockopt);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800947#endif
948
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949/*
950 * Get the options. Note for future reference. The GET of IP options gets the
951 * _received_ ones. The set sets the _sent_ ones.
952 */
953
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800954static int do_ip_getsockopt(struct sock *sk, int level, int optname,
Stephen Hemminger132adf52007-03-08 20:44:43 -0800955 char __user *optval, int __user *optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956{
957 struct inet_sock *inet = inet_sk(sk);
958 int val;
959 int len;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900960
Stephen Hemminger132adf52007-03-08 20:44:43 -0800961 if (level != SOL_IP)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962 return -EOPNOTSUPP;
963
Pavel Emelyanov6a9fb942007-11-05 21:32:31 -0800964 if (ip_mroute_opt(optname))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965 return ip_mroute_getsockopt(sk,optname,optval,optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700966
Stephen Hemminger132adf52007-03-08 20:44:43 -0800967 if (get_user(len,optlen))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968 return -EFAULT;
Stephen Hemminger132adf52007-03-08 20:44:43 -0800969 if (len < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700970 return -EINVAL;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900971
Linus Torvalds1da177e2005-04-16 15:20:36 -0700972 lock_sock(sk);
973
Stephen Hemminger132adf52007-03-08 20:44:43 -0800974 switch (optname) {
975 case IP_OPTIONS:
976 {
977 unsigned char optbuf[sizeof(struct ip_options)+40];
978 struct ip_options * opt = (struct ip_options*)optbuf;
979 opt->optlen = 0;
980 if (inet->opt)
981 memcpy(optbuf, inet->opt,
982 sizeof(struct ip_options)+
983 inet->opt->optlen);
984 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700985
Stephen Hemminger132adf52007-03-08 20:44:43 -0800986 if (opt->optlen == 0)
987 return put_user(0, optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988
Stephen Hemminger132adf52007-03-08 20:44:43 -0800989 ip_options_undo(opt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990
Stephen Hemminger132adf52007-03-08 20:44:43 -0800991 len = min_t(unsigned int, len, opt->optlen);
992 if (put_user(len, optlen))
993 return -EFAULT;
994 if (copy_to_user(optval, opt->__data, len))
995 return -EFAULT;
996 return 0;
997 }
998 case IP_PKTINFO:
999 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
1000 break;
1001 case IP_RECVTTL:
1002 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1003 break;
1004 case IP_RECVTOS:
1005 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1006 break;
1007 case IP_RECVOPTS:
1008 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1009 break;
1010 case IP_RETOPTS:
1011 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1012 break;
1013 case IP_PASSSEC:
1014 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1015 break;
1016 case IP_TOS:
1017 val = inet->tos;
1018 break;
1019 case IP_TTL:
1020 val = (inet->uc_ttl == -1 ?
1021 sysctl_ip_default_ttl :
1022 inet->uc_ttl);
1023 break;
1024 case IP_HDRINCL:
1025 val = inet->hdrincl;
1026 break;
1027 case IP_MTU_DISCOVER:
1028 val = inet->pmtudisc;
1029 break;
1030 case IP_MTU:
1031 {
1032 struct dst_entry *dst;
1033 val = 0;
1034 dst = sk_dst_get(sk);
1035 if (dst) {
1036 val = dst_mtu(dst);
1037 dst_release(dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038 }
Stephen Hemminger132adf52007-03-08 20:44:43 -08001039 if (!val) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001040 release_sock(sk);
Stephen Hemminger132adf52007-03-08 20:44:43 -08001041 return -ENOTCONN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042 }
Stephen Hemminger132adf52007-03-08 20:44:43 -08001043 break;
1044 }
1045 case IP_RECVERR:
1046 val = inet->recverr;
1047 break;
1048 case IP_MULTICAST_TTL:
1049 val = inet->mc_ttl;
1050 break;
1051 case IP_MULTICAST_LOOP:
1052 val = inet->mc_loop;
1053 break;
1054 case IP_MULTICAST_IF:
1055 {
1056 struct in_addr addr;
1057 len = min_t(unsigned int, len, sizeof(struct in_addr));
1058 addr.s_addr = inet->mc_addr;
1059 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001060
Stephen Hemminger132adf52007-03-08 20:44:43 -08001061 if (put_user(len, optlen))
1062 return -EFAULT;
1063 if (copy_to_user(optval, &addr, len))
1064 return -EFAULT;
1065 return 0;
1066 }
1067 case IP_MSFILTER:
1068 {
1069 struct ip_msfilter msf;
1070 int err;
1071
1072 if (len < IP_MSFILTER_SIZE(0)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073 release_sock(sk);
Stephen Hemminger132adf52007-03-08 20:44:43 -08001074 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075 }
Stephen Hemminger132adf52007-03-08 20:44:43 -08001076 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077 release_sock(sk);
Stephen Hemminger132adf52007-03-08 20:44:43 -08001078 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001079 }
Stephen Hemminger132adf52007-03-08 20:44:43 -08001080 err = ip_mc_msfget(sk, &msf,
1081 (struct ip_msfilter __user *)optval, optlen);
1082 release_sock(sk);
1083 return err;
1084 }
1085 case MCAST_MSFILTER:
1086 {
1087 struct group_filter gsf;
1088 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001089
Stephen Hemminger132adf52007-03-08 20:44:43 -08001090 if (len < GROUP_FILTER_SIZE(0)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001091 release_sock(sk);
Stephen Hemminger132adf52007-03-08 20:44:43 -08001092 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093 }
Stephen Hemminger132adf52007-03-08 20:44:43 -08001094 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001095 release_sock(sk);
Stephen Hemminger132adf52007-03-08 20:44:43 -08001096 return -EFAULT;
1097 }
1098 err = ip_mc_gsfget(sk, &gsf,
1099 (struct group_filter __user *)optval, optlen);
1100 release_sock(sk);
1101 return err;
1102 }
1103 case IP_PKTOPTIONS:
1104 {
1105 struct msghdr msg;
1106
1107 release_sock(sk);
1108
1109 if (sk->sk_type != SOCK_STREAM)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110 return -ENOPROTOOPT;
Stephen Hemminger132adf52007-03-08 20:44:43 -08001111
1112 msg.msg_control = optval;
1113 msg.msg_controllen = len;
1114 msg.msg_flags = 0;
1115
1116 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1117 struct in_pktinfo info;
1118
1119 info.ipi_addr.s_addr = inet->rcv_saddr;
1120 info.ipi_spec_dst.s_addr = inet->rcv_saddr;
1121 info.ipi_ifindex = inet->mc_index;
1122 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1123 }
1124 if (inet->cmsg_flags & IP_CMSG_TTL) {
1125 int hlim = inet->mc_ttl;
1126 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1127 }
1128 len -= msg.msg_controllen;
1129 return put_user(len, optlen);
1130 }
1131 case IP_FREEBIND:
1132 val = inet->freebind;
1133 break;
1134 default:
1135 release_sock(sk);
1136 return -ENOPROTOOPT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001137 }
1138 release_sock(sk);
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001139
Linus Torvalds1da177e2005-04-16 15:20:36 -07001140 if (len < sizeof(int) && len > 0 && val>=0 && val<255) {
1141 unsigned char ucval = (unsigned char)val;
1142 len = 1;
Stephen Hemminger132adf52007-03-08 20:44:43 -08001143 if (put_user(len, optlen))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001144 return -EFAULT;
Stephen Hemminger132adf52007-03-08 20:44:43 -08001145 if (copy_to_user(optval,&ucval,1))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001146 return -EFAULT;
1147 } else {
1148 len = min_t(unsigned int, sizeof(int), len);
Stephen Hemminger132adf52007-03-08 20:44:43 -08001149 if (put_user(len, optlen))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001150 return -EFAULT;
Stephen Hemminger132adf52007-03-08 20:44:43 -08001151 if (copy_to_user(optval,&val,len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152 return -EFAULT;
1153 }
1154 return 0;
1155}
1156
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001157int ip_getsockopt(struct sock *sk, int level,
Stephen Hemminger132adf52007-03-08 20:44:43 -08001158 int optname, char __user *optval, int __user *optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001159{
1160 int err;
1161
1162 err = do_ip_getsockopt(sk, level, optname, optval, optlen);
1163#ifdef CONFIG_NETFILTER
1164 /* we need to exclude all possible ENOPROTOOPTs except default case */
Pavel Emelyanov6a9fb942007-11-05 21:32:31 -08001165 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1166 !ip_mroute_opt(optname)) {
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001167 int len;
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001168
Stephen Hemminger132adf52007-03-08 20:44:43 -08001169 if (get_user(len,optlen))
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001170 return -EFAULT;
1171
1172 lock_sock(sk);
1173 err = nf_getsockopt(sk, PF_INET, optname, optval,
1174 &len);
1175 release_sock(sk);
1176 if (err >= 0)
1177 err = put_user(len, optlen);
1178 return err;
1179 }
1180#endif
1181 return err;
1182}
1183
1184#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001185int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1186 char __user *optval, int __user *optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001187{
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001188 int err = do_ip_getsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001189#ifdef CONFIG_NETFILTER
1190 /* we need to exclude all possible ENOPROTOOPTs except default case */
Pavel Emelyanov6a9fb942007-11-05 21:32:31 -08001191 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1192 !ip_mroute_opt(optname)) {
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001193 int len;
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001194
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001195 if (get_user(len, optlen))
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001196 return -EFAULT;
1197
1198 lock_sock(sk);
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001199 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001200 release_sock(sk);
1201 if (err >= 0)
1202 err = put_user(len, optlen);
1203 return err;
1204 }
1205#endif
1206 return err;
1207}
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001208
1209EXPORT_SYMBOL(compat_ip_getsockopt);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001210#endif
1211
Linus Torvalds1da177e2005-04-16 15:20:36 -07001212EXPORT_SYMBOL(ip_cmsg_recv);
1213
Linus Torvalds1da177e2005-04-16 15:20:36 -07001214EXPORT_SYMBOL(ip_getsockopt);
1215EXPORT_SYMBOL(ip_setsockopt);