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[NETNS]: Add namespace parameter to ip_dev_find.
[net-next-2.6.git] / net / ipv4 / ip_sockglue.c
CommitLineData
1da177e4
LT		 1/*
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.
e905a9ed 7 *
1da177e4
LT		 8 * 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.
e905a9ed 15 * Alan Cox : Fixed a couple of oopses in Martin's
1da177e4
LT		 16 * TOS tweaks.
17 * Mike McLagan : Routing by source
18 */
19
1da177e4
LT		 20#include <linux/module.h>
21#include <linux/types.h>
22#include <linux/mm.h>
1da177e4
LT		 23#include <linux/skbuff.h>
24#include <linux/ip.h>
25#include <linux/icmp.h>
14c85021 26#include <linux/inetdevice.h>
1da177e4
LT		 27#include <linux/netdevice.h>
28#include <net/sock.h>
29#include <net/ip.h>
30#include <net/icmp.h>
d83d8461 31#include <net/tcp_states.h>
1da177e4
LT		 32#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
2c7946a7 51#define IP_CMSG_PASSSEC 32
1da177e4
LT		 52
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
eddc9ec5 62 info.ipi_addr.s_addr = ip_hdr(skb)->daddr;
1da177e4
LT		 63 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{
eddc9ec5 76 int ttl = ip_hdr(skb)->ttl;
1da177e4
LT		 77 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{
eddc9ec5 82 put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos);
1da177e4
LT		 83}
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
eddc9ec5
ACM		 90 put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen,
91 ip_hdr(skb) + 1);
1da177e4
LT		 92}
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
2c7946a7
CZ		 112static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
113{
114 char *secdata;
dc49c1f9 115 u32 seclen, secid;
2c7946a7
CZ		 116 int err;
117
dc49c1f9
CZ		 118 err = security_socket_getpeersec_dgram(NULL, skb, &secid);
119 if (err)
120 return;
121
122 err = security_secid_to_secctx(secid, &secdata, &seclen);
2c7946a7
CZ		 123 if (err)
124 return;
125
126 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
dc49c1f9 127 security_release_secctx(secdata, seclen);
2c7946a7
CZ		 128}
129
1da177e4
LT		 130
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);
2c7946a7
CZ		 159 if ((flags>>=1) == 0)
160 return;
161
162 if (flags & 1)
163 ip_cmsg_recv_security(msg, skb);
1da177e4
LT		 164}
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));
4c6ea29d 179 err = ip_options_get(&ipc->opt, CMSG_DATA(cmsg), err < 40 ? err : 40);
1da177e4
LT		 180 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);
a51482bd 228 kfree(new_ra);
1da177e4
LT		 229 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
e905a9ed 256void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
35986b32 257 __be16 port, u32 info, u8 *payload)
1da177e4
LT		 258{
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
e905a9ed 269 serr = SKB_EXT_ERR(skb);
1da177e4
LT		 270 serr->ee.ee_errno = err;
271 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
88c7664f
ACM		 272 serr->ee.ee_type = icmp_hdr(skb)->type;
273 serr->ee.ee_code = icmp_hdr(skb)->code;
1da177e4
LT		 274 serr->ee.ee_pad = 0;
275 serr->ee.ee_info = info;
276 serr->ee.ee_data = 0;
88c7664f 277 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
d56f90a7 278 skb_network_header(skb);
1da177e4
LT		 279 serr->port = port;
280
bd82393c
ACM		 281 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);
1da177e4
LT		 287}
288
0579016e 289void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
1da177e4
LT		 290{
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
2ca9e6f2
ACM		 303 skb_put(skb, sizeof(struct iphdr));
304 skb_reset_network_header(skb);
eddc9ec5 305 iph = ip_hdr(skb);
1da177e4
LT		 306 iph->daddr = daddr;
307
e905a9ed 308 serr = SKB_EXT_ERR(skb);
1da177e4
LT		 309 serr->ee.ee_errno = err;
310 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
e905a9ed 311 serr->ee.ee_type = 0;
1da177e4
LT		 312 serr->ee.ee_code = 0;
313 serr->ee.ee_pad = 0;
314 serr->ee.ee_info = info;
315 serr->ee.ee_data = 0;
d56f90a7 316 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
1da177e4
LT		 317 serr->port = port;
318
27a884dc 319 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
bd82393c 320 skb_reset_transport_header(skb);
1da177e4
LT		 321
322 if (sock_queue_err_skb(sk, skb))
323 kfree_skb(skb);
324}
325
e905a9ed 326/*
1da177e4
LT		 327 * 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;
d56f90a7
ACM		 362 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
363 serr->addr_offset);
1da177e4
LT		 364 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;
eddc9ec5 375 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
1da177e4
LT		 376 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 */
e0f9f858 390 spin_lock_bh(&sk->sk_error_queue.lock);
1da177e4
LT		 391 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;
e0f9f858 394 spin_unlock_bh(&sk->sk_error_queue.lock);
1da177e4
LT		 395 sk->sk_error_report(sk);
396 } else
e0f9f858 397 spin_unlock_bh(&sk->sk_error_queue.lock);
1da177e4 398
e905a9ed 399out_free_skb:
1da177e4
LT		 400 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
3fdadf7d 411static int do_ip_setsockopt(struct sock *sk, int level,
132adf54 412 int optname, char __user *optval, int optlen)
1da177e4
LT		 413{
414 struct inet_sock *inet = inet_sk(sk);
415 int val=0,err;
416
e905a9ed 417 if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) |
132adf54
SH		 418 (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) {
1da177e4
LT		 426 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
6a9fb947 440 if (ip_mroute_opt(optname))
1da177e4 441 return ip_mroute_setsockopt(sk,optname,optval,optlen);
1da177e4
LT		 442
443 err = 0;
444 lock_sock(sk);
445
446 switch (optname) {
132adf54
SH		 447 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);
1da177e4 457#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
132adf54
SH		 458 if (sk->sk_family == PF_INET ||
459 (!((1 << sk->sk_state) &
460 (TCPF_LISTEN | TCPF_CLOSE)) &&
461 inet->daddr != LOOPBACK4_IPV6)) {
1da177e4 462#endif
132adf54
SH		 463 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);
1da177e4 468#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1da177e4 469 }
132adf54 470#endif
1da177e4 471 }
132adf54
SH		 472 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;
516 }
517 if (IPTOS_PREC(val) >= IPTOS_PREC_CRITIC_ECP &&
518 !capable(CAP_NET_ADMIN)) {
519 err = -EPERM;
1da177e4 520 break;
132adf54
SH		 521 }
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) {
537 err = -ENOPROTOOPT;
2c7946a7 538 break;
132adf54
SH		 539 }
540 inet->hdrincl = val ? 1 : 0;
541 break;
542 case IP_MTU_DISCOVER:
628a5c56 543 if (val<0 || val>3)
132adf54
SH		 544 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)))
1da177e4 582 break;
132adf54
SH		 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;
1da177e4
LT		 595 break;
596 }
1ab35276 597 dev = ip_dev_find(&init_net, mreq.imr_address.s_addr);
132adf54
SH		 598 if (dev) {
599 mreq.imr_ifindex = dev->ifindex;
600 dev_put(dev);
601 }
602 } else
881d966b 603 dev = __dev_get_by_index(&init_net, mreq.imr_ifindex);
1da177e4 604
1da177e4 605
132adf54
SH		 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;
1da177e4 614
132adf54
SH		 615 inet->mc_index = mreq.imr_ifindex;
616 inet->mc_addr = mreq.imr_address.s_addr;
617 err = 0;
618 break;
619 }
1da177e4 620
132adf54
SH		 621 case IP_ADD_MEMBERSHIP:
622 case IP_DROP_MEMBERSHIP:
623 {
624 struct ip_mreqn mreq;
1da177e4 625
a96fb49b
FL		 626 err = -EPROTO;
627 if (inet_sk(sk)->is_icsk)
628 break;
629
132adf54
SH		 630 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)))
1da177e4 635 break;
132adf54
SH		 636 } else {
637 memset(&mreq, 0, sizeof(mreq));
638 if (copy_from_user(&mreq,optval,sizeof(struct ip_mreq)))
1da177e4 639 break;
132adf54 640 }
1da177e4 641
132adf54
SH		 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;
1da177e4
LT		 657 break;
658 }
132adf54 659 msf = kmalloc(optlen, GFP_KERNEL);
cfcabdcc 660 if (!msf) {
132adf54
SH		 661 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;
1da177e4 692
132adf54
SH		 693 if (optlen != sizeof(struct ip_mreq_source))
694 goto e_inval;
695 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
1da177e4 696 err = -EFAULT;
1da177e4
LT		 697 break;
698 }
132adf54
SH		 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;
1da177e4 707
132adf54
SH		 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)
1da177e4 713 break;
132adf54
SH		 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))) {
1da177e4 761 err = -EFAULT;
1da177e4
LT		 762 break;
763 }
132adf54
SH		 764 if (greqs.gsr_group.ss_family != AF_INET ||
765 greqs.gsr_source.ss_family != AF_INET) {
766 err = -EADDRNOTAVAIL;
1da177e4
LT		 767 break;
768 }
132adf54
SH		 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) {
1da177e4
LT		 782 struct ip_mreqn mreq;
783
132adf54 784 psin = (struct sockaddr_in *)&greqs.gsr_group;
1da177e4 785 mreq.imr_multiaddr = psin->sin_addr;
132adf54
SH		 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;
1da177e4
LT		 814 break;
815 }
132adf54 816 gsf = kmalloc(optlen,GFP_KERNEL);
cfcabdcc 817 if (!gsf) {
132adf54 818 err = -ENOBUFS;
1da177e4
LT		 819 break;
820 }
132adf54
SH		 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);
cfcabdcc 837 if (!msf) {
132adf54
SH		 838 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) {
1da177e4 844 err = -EADDRNOTAVAIL;
132adf54 845 goto mc_msf_out;
1da177e4 846 }
132adf54
SH		 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];
e905a9ed 854
132adf54
SH		 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))
1da177e4 882 break;
132adf54
SH		 883 err = xfrm_user_policy(sk, optname, optval, optlen);
884 break;
1da177e4 885
132adf54
SH		 886 default:
887 err = -ENOPROTOOPT;
888 break;
1da177e4
LT		 889 }
890 release_sock(sk);
891 return err;
892
893e_inval:
894 release_sock(sk);
895 return -EINVAL;
896}
897
3fdadf7d
DM		 898int 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 &&
6a9fb947
PE		 910 optname != IP_IPSEC_POLICY &&
911 optname != IP_XFRM_POLICY &&
912 !ip_mroute_opt(optname)) {
3fdadf7d
DM		 913 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
543d9cfe
ACM		 922int compat_ip_setsockopt(struct sock *sk, int level, int optname,
923 char __user *optval, int optlen)
3fdadf7d
DM		 924{
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 &&
6a9fb947
PE		 934 optname != IP_IPSEC_POLICY &&
935 optname != IP_XFRM_POLICY &&
936 !ip_mroute_opt(optname)) {
3fdadf7d 937 lock_sock(sk);
543d9cfe
ACM		 938 err = compat_nf_setsockopt(sk, PF_INET, optname,
939 optval, optlen);
3fdadf7d
DM		 940 release_sock(sk);
941 }
942#endif
943 return err;
944}
543d9cfe
ACM		 945
946EXPORT_SYMBOL(compat_ip_setsockopt);
3fdadf7d
DM		 947#endif
948
1da177e4
LT		 949/*
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
3fdadf7d 954static int do_ip_getsockopt(struct sock *sk, int level, int optname,
132adf54 955 char __user *optval, int __user *optlen)
1da177e4
LT		 956{
957 struct inet_sock *inet = inet_sk(sk);
958 int val;
959 int len;
e905a9ed 960
132adf54 961 if (level != SOL_IP)
1da177e4
LT		 962 return -EOPNOTSUPP;
963
6a9fb947 964 if (ip_mroute_opt(optname))
1da177e4 965 return ip_mroute_getsockopt(sk,optname,optval,optlen);
1da177e4 966
132adf54 967 if (get_user(len,optlen))
1da177e4 968 return -EFAULT;
132adf54 969 if (len < 0)
1da177e4 970 return -EINVAL;
e905a9ed 971
1da177e4
LT		 972 lock_sock(sk);
973
132adf54
SH		 974 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);
985
986 if (opt->optlen == 0)
987 return put_user(0, optlen);
988
989 ip_options_undo(opt);
990
991 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);
1da177e4 1038 }
132adf54 1039 if (!val) {
1da177e4 1040 release_sock(sk);
132adf54 1041 return -ENOTCONN;
1da177e4 1042 }
132adf54
SH		 1043 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);
1da177e4 1060
132adf54
SH		 1061 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)) {
1da177e4 1073 release_sock(sk);
132adf54 1074 return -EINVAL;
1da177e4 1075 }
132adf54 1076 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1da177e4 1077 release_sock(sk);
132adf54 1078 return -EFAULT;
1da177e4 1079 }
132adf54
SH		 1080 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;
1da177e4 1089
132adf54 1090 if (len < GROUP_FILTER_SIZE(0)) {
1da177e4 1091 release_sock(sk);
132adf54
SH		 1092 return -EINVAL;
1093 }
1094 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1095 release_sock(sk);
1096 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;
1da177e4 1106
132adf54 1107 release_sock(sk);
1da177e4 1108
132adf54
SH		 1109 if (sk->sk_type != SOCK_STREAM)
1110 return -ENOPROTOOPT;
1da177e4 1111
132adf54
SH		 1112 msg.msg_control = optval;
1113 msg.msg_controllen = len;
1114 msg.msg_flags = 0;
1da177e4 1115
132adf54
SH		 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);
1da177e4 1123 }
132adf54
SH		 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;
1da177e4
LT		 1137 }
1138 release_sock(sk);
e905a9ed 1139
1da177e4
LT		 1140 if (len < sizeof(int) && len > 0 && val>=0 && val<255) {
1141 unsigned char ucval = (unsigned char)val;
1142 len = 1;
132adf54 1143 if (put_user(len, optlen))
1da177e4 1144 return -EFAULT;
132adf54 1145 if (copy_to_user(optval,&ucval,1))
1da177e4
LT		 1146 return -EFAULT;
1147 } else {
1148 len = min_t(unsigned int, sizeof(int), len);
132adf54 1149 if (put_user(len, optlen))
1da177e4 1150 return -EFAULT;
132adf54 1151 if (copy_to_user(optval,&val,len))
1da177e4
LT		 1152 return -EFAULT;
1153 }
1154 return 0;
1155}
1156
3fdadf7d 1157int ip_getsockopt(struct sock *sk, int level,
132adf54 1158 int optname, char __user *optval, int __user *optlen)
3fdadf7d
DM		 1159{
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 */
6a9fb947
PE		 1165 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1166 !ip_mroute_opt(optname)) {
e905a9ed 1167 int len;
3fdadf7d 1168
132adf54 1169 if (get_user(len,optlen))
3fdadf7d
DM		 1170 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
543d9cfe
ACM		 1185int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1186 char __user *optval, int __user *optlen)
3fdadf7d 1187{
543d9cfe 1188 int err = do_ip_getsockopt(sk, level, optname, optval, optlen);
3fdadf7d
DM		 1189#ifdef CONFIG_NETFILTER
1190 /* we need to exclude all possible ENOPROTOOPTs except default case */
6a9fb947
PE		 1191 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1192 !ip_mroute_opt(optname)) {
e905a9ed 1193 int len;
3fdadf7d 1194
543d9cfe 1195 if (get_user(len, optlen))
3fdadf7d
DM		 1196 return -EFAULT;
1197
1198 lock_sock(sk);
543d9cfe 1199 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
3fdadf7d
DM		 1200 release_sock(sk);
1201 if (err >= 0)
1202 err = put_user(len, optlen);
1203 return err;
1204 }
1205#endif
1206 return err;
1207}
543d9cfe
ACM		 1208
1209EXPORT_SYMBOL(compat_ip_getsockopt);
3fdadf7d
DM		 1210#endif
1211
1da177e4
LT		 1212EXPORT_SYMBOL(ip_cmsg_recv);
1213
1da177e4
LT		 1214EXPORT_SYMBOL(ip_getsockopt);
1215EXPORT_SYMBOL(ip_setsockopt);
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