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net: Several cleanups for the setsockopt compat support.
[mirror_ubuntu-hirsute-kernel.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>
dae50295 39#include <net/compat.h>
1da177e4
LT		 40#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
41#include <net/transp_v6.h>
42#endif
43
44#include <linux/errqueue.h>
45#include <asm/uaccess.h>
46
47#define IP_CMSG_PKTINFO 1
48#define IP_CMSG_TTL 2
49#define IP_CMSG_TOS 4
50#define IP_CMSG_RECVOPTS 8
51#define IP_CMSG_RETOPTS 16
2c7946a7 52#define IP_CMSG_PASSSEC 32
1da177e4
LT		 53
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;
ee6b9673 61 struct rtable *rt = skb->rtable;
1da177e4 62
eddc9ec5 63 info.ipi_addr.s_addr = ip_hdr(skb)->daddr;
1da177e4
LT		 64 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{
eddc9ec5 77 int ttl = ip_hdr(skb)->ttl;
1da177e4
LT		 78 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{
eddc9ec5 83 put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos);
1da177e4
LT		 84}
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
eddc9ec5
ACM		 91 put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen,
92 ip_hdr(skb) + 1);
1da177e4
LT		 93}
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];
99 struct ip_options * opt = (struct ip_options*)optbuf;
100
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
2c7946a7
CZ		 113static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
114{
115 char *secdata;
dc49c1f9 116 u32 seclen, secid;
2c7946a7
CZ		 117 int err;
118
dc49c1f9
CZ		 119 err = security_socket_getpeersec_dgram(NULL, skb, &secid);
120 if (err)
121 return;
122
123 err = security_secid_to_secctx(secid, &secdata, &seclen);
2c7946a7
CZ		 124 if (err)
125 return;
126
127 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
dc49c1f9 128 security_release_secctx(secdata, seclen);
2c7946a7
CZ		 129}
130
1da177e4
LT		 131
132void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
133{
134 struct inet_sock *inet = inet_sk(skb->sk);
135 unsigned flags = inet->cmsg_flags;
136
137 /* Ordered by supposed usage frequency */
138 if (flags & 1)
139 ip_cmsg_recv_pktinfo(msg, skb);
140 if ((flags>>=1) == 0)
141 return;
142
143 if (flags & 1)
144 ip_cmsg_recv_ttl(msg, skb);
145 if ((flags>>=1) == 0)
146 return;
147
148 if (flags & 1)
149 ip_cmsg_recv_tos(msg, skb);
150 if ((flags>>=1) == 0)
151 return;
152
153 if (flags & 1)
154 ip_cmsg_recv_opts(msg, skb);
155 if ((flags>>=1) == 0)
156 return;
157
158 if (flags & 1)
159 ip_cmsg_recv_retopts(msg, skb);
2c7946a7
CZ		 160 if ((flags>>=1) == 0)
161 return;
162
163 if (flags & 1)
164 ip_cmsg_recv_security(msg, skb);
1da177e4
LT		 165}
166
7a6adb92 167int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc)
1da177e4
LT		 168{
169 int err;
170 struct cmsghdr *cmsg;
171
172 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
173 if (!CMSG_OK(msg, cmsg))
174 return -EINVAL;
175 if (cmsg->cmsg_level != SOL_IP)
176 continue;
177 switch (cmsg->cmsg_type) {
178 case IP_RETOPTS:
179 err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
7a6adb92 180 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg), err < 40 ? err : 40);
1da177e4
LT		 181 if (err)
182 return err;
183 break;
184 case IP_PKTINFO:
185 {
186 struct in_pktinfo *info;
187 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
188 return -EINVAL;
189 info = (struct in_pktinfo *)CMSG_DATA(cmsg);
190 ipc->oif = info->ipi_ifindex;
191 ipc->addr = info->ipi_spec_dst.s_addr;
192 break;
193 }
194 default:
195 return -EINVAL;
196 }
197 }
198 return 0;
199}
200
201
202/* Special input handler for packets caught by router alert option.
203 They are selected only by protocol field, and then processed likely
204 local ones; but only if someone wants them! Otherwise, router
205 not running rsvpd will kill RSVP.
206
207 It is user level problem, what it will make with them.
208 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
209 but receiver should be enough clever f.e. to forward mtrace requests,
210 sent to multicast group to reach destination designated router.
211 */
212struct ip_ra_chain *ip_ra_chain;
213DEFINE_RWLOCK(ip_ra_lock);
214
215int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *))
216{
217 struct ip_ra_chain *ra, *new_ra, **rap;
218
219 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num == IPPROTO_RAW)
220 return -EINVAL;
221
222 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
223
224 write_lock_bh(&ip_ra_lock);
225 for (rap = &ip_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
226 if (ra->sk == sk) {
227 if (on) {
228 write_unlock_bh(&ip_ra_lock);
a51482bd 229 kfree(new_ra);
1da177e4
LT		 230 return -EADDRINUSE;
231 }
232 *rap = ra->next;
233 write_unlock_bh(&ip_ra_lock);
234
235 if (ra->destructor)
236 ra->destructor(sk);
237 sock_put(sk);
238 kfree(ra);
239 return 0;
240 }
241 }
242 if (new_ra == NULL) {
243 write_unlock_bh(&ip_ra_lock);
244 return -ENOBUFS;
245 }
246 new_ra->sk = sk;
247 new_ra->destructor = destructor;
248
249 new_ra->next = ra;
250 *rap = new_ra;
251 sock_hold(sk);
252 write_unlock_bh(&ip_ra_lock);
253
254 return 0;
255}
256
e905a9ed 257void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
35986b32 258 __be16 port, u32 info, u8 *payload)
1da177e4
LT		 259{
260 struct inet_sock *inet = inet_sk(sk);
261 struct sock_exterr_skb *serr;
262
263 if (!inet->recverr)
264 return;
265
266 skb = skb_clone(skb, GFP_ATOMIC);
267 if (!skb)
268 return;
269
e905a9ed 270 serr = SKB_EXT_ERR(skb);
1da177e4
LT		 271 serr->ee.ee_errno = err;
272 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
88c7664f
ACM		 273 serr->ee.ee_type = icmp_hdr(skb)->type;
274 serr->ee.ee_code = icmp_hdr(skb)->code;
1da177e4
LT		 275 serr->ee.ee_pad = 0;
276 serr->ee.ee_info = info;
277 serr->ee.ee_data = 0;
88c7664f 278 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
d56f90a7 279 skb_network_header(skb);
1da177e4
LT		 280 serr->port = port;
281
bd82393c
ACM		 282 if (skb_pull(skb, payload - skb->data) != NULL) {
283 skb_reset_transport_header(skb);
284 if (sock_queue_err_skb(sk, skb) == 0)
285 return;
286 }
287 kfree_skb(skb);
1da177e4
LT		 288}
289
0579016e 290void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
1da177e4
LT		 291{
292 struct inet_sock *inet = inet_sk(sk);
293 struct sock_exterr_skb *serr;
294 struct iphdr *iph;
295 struct sk_buff *skb;
296
297 if (!inet->recverr)
298 return;
299
300 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
301 if (!skb)
302 return;
303
2ca9e6f2
ACM		 304 skb_put(skb, sizeof(struct iphdr));
305 skb_reset_network_header(skb);
eddc9ec5 306 iph = ip_hdr(skb);
1da177e4
LT		 307 iph->daddr = daddr;
308
e905a9ed 309 serr = SKB_EXT_ERR(skb);
1da177e4
LT		 310 serr->ee.ee_errno = err;
311 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
e905a9ed 312 serr->ee.ee_type = 0;
1da177e4
LT		 313 serr->ee.ee_code = 0;
314 serr->ee.ee_pad = 0;
315 serr->ee.ee_info = info;
316 serr->ee.ee_data = 0;
d56f90a7 317 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
1da177e4
LT		 318 serr->port = port;
319
27a884dc 320 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
bd82393c 321 skb_reset_transport_header(skb);
1da177e4
LT		 322
323 if (sock_queue_err_skb(sk, skb))
324 kfree_skb(skb);
325}
326
e905a9ed 327/*
1da177e4
LT		 328 * Handle MSG_ERRQUEUE
329 */
330int ip_recv_error(struct sock *sk, struct msghdr *msg, int len)
331{
332 struct sock_exterr_skb *serr;
333 struct sk_buff *skb, *skb2;
334 struct sockaddr_in *sin;
335 struct {
336 struct sock_extended_err ee;
337 struct sockaddr_in offender;
338 } errhdr;
339 int err;
340 int copied;
341
342 err = -EAGAIN;
343 skb = skb_dequeue(&sk->sk_error_queue);
344 if (skb == NULL)
345 goto out;
346
347 copied = skb->len;
348 if (copied > len) {
349 msg->msg_flags |= MSG_TRUNC;
350 copied = len;
351 }
352 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
353 if (err)
354 goto out_free_skb;
355
356 sock_recv_timestamp(msg, sk, skb);
357
358 serr = SKB_EXT_ERR(skb);
359
360 sin = (struct sockaddr_in *)msg->msg_name;
361 if (sin) {
362 sin->sin_family = AF_INET;
d56f90a7
ACM		 363 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
364 serr->addr_offset);
1da177e4
LT		 365 sin->sin_port = serr->port;
366 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
367 }
368
369 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
370 sin = &errhdr.offender;
371 sin->sin_family = AF_UNSPEC;
372 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
373 struct inet_sock *inet = inet_sk(sk);
374
375 sin->sin_family = AF_INET;
eddc9ec5 376 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
1da177e4
LT		 377 sin->sin_port = 0;
378 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
379 if (inet->cmsg_flags)
380 ip_cmsg_recv(msg, skb);
381 }
382
383 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
384
385 /* Now we could try to dump offended packet options */
386
387 msg->msg_flags |= MSG_ERRQUEUE;
388 err = copied;
389
390 /* Reset and regenerate socket error */
e0f9f858 391 spin_lock_bh(&sk->sk_error_queue.lock);
1da177e4
LT		 392 sk->sk_err = 0;
393 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
394 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
e0f9f858 395 spin_unlock_bh(&sk->sk_error_queue.lock);
1da177e4
LT		 396 sk->sk_error_report(sk);
397 } else
e0f9f858 398 spin_unlock_bh(&sk->sk_error_queue.lock);
1da177e4 399
e905a9ed 400out_free_skb:
1da177e4
LT		 401 kfree_skb(skb);
402out:
403 return err;
404}
405
406
407/*
408 * Socket option code for IP. This is the end of the line after any TCP,UDP etc options on
409 * an IP socket.
410 */
411
3fdadf7d 412static int do_ip_setsockopt(struct sock *sk, int level,
132adf54 413 int optname, char __user *optval, int optlen)
1da177e4
LT		 414{
415 struct inet_sock *inet = inet_sk(sk);
416 int val=0,err;
417
e905a9ed 418 if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) |
132adf54
SH		 419 (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) |
420 (1<<IP_RETOPTS) | (1<<IP_TOS) |
421 (1<<IP_TTL) | (1<<IP_HDRINCL) |
422 (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) |
423 (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) |
424 (1<<IP_PASSSEC))) ||
425 optname == IP_MULTICAST_TTL ||
426 optname == IP_MULTICAST_LOOP) {
1da177e4
LT		 427 if (optlen >= sizeof(int)) {
428 if (get_user(val, (int __user *) optval))
429 return -EFAULT;
430 } else if (optlen >= sizeof(char)) {
431 unsigned char ucval;
432
433 if (get_user(ucval, (unsigned char __user *) optval))
434 return -EFAULT;
435 val = (int) ucval;
436 }
437 }
438
439 /* If optlen==0, it is equivalent to val == 0 */
440
6a9fb947 441 if (ip_mroute_opt(optname))
1da177e4 442 return ip_mroute_setsockopt(sk,optname,optval,optlen);
1da177e4
LT		 443
444 err = 0;
445 lock_sock(sk);
446
447 switch (optname) {
132adf54
SH		 448 case IP_OPTIONS:
449 {
450 struct ip_options * opt = NULL;
451 if (optlen > 40 || optlen < 0)
452 goto e_inval;
3b1e0a65 453 err = ip_options_get_from_user(sock_net(sk), &opt,
cb84663e 454 optval, optlen);
132adf54
SH		 455 if (err)
456 break;
457 if (inet->is_icsk) {
458 struct inet_connection_sock *icsk = inet_csk(sk);
1da177e4 459#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
132adf54
SH		 460 if (sk->sk_family == PF_INET ||
461 (!((1 << sk->sk_state) &
462 (TCPF_LISTEN | TCPF_CLOSE)) &&
463 inet->daddr != LOOPBACK4_IPV6)) {
1da177e4 464#endif
132adf54
SH		 465 if (inet->opt)
466 icsk->icsk_ext_hdr_len -= inet->opt->optlen;
467 if (opt)
468 icsk->icsk_ext_hdr_len += opt->optlen;
469 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
1da177e4 470#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1da177e4 471 }
132adf54 472#endif
1da177e4 473 }
132adf54
SH		 474 opt = xchg(&inet->opt, opt);
475 kfree(opt);
476 break;
477 }
478 case IP_PKTINFO:
479 if (val)
480 inet->cmsg_flags |= IP_CMSG_PKTINFO;
481 else
482 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
483 break;
484 case IP_RECVTTL:
485 if (val)
486 inet->cmsg_flags |= IP_CMSG_TTL;
487 else
488 inet->cmsg_flags &= ~IP_CMSG_TTL;
489 break;
490 case IP_RECVTOS:
491 if (val)
492 inet->cmsg_flags |= IP_CMSG_TOS;
493 else
494 inet->cmsg_flags &= ~IP_CMSG_TOS;
495 break;
496 case IP_RECVOPTS:
497 if (val)
498 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
499 else
500 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
501 break;
502 case IP_RETOPTS:
503 if (val)
504 inet->cmsg_flags |= IP_CMSG_RETOPTS;
505 else
506 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
507 break;
508 case IP_PASSSEC:
509 if (val)
510 inet->cmsg_flags |= IP_CMSG_PASSSEC;
511 else
512 inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
513 break;
514 case IP_TOS: /* This sets both TOS and Precedence */
515 if (sk->sk_type == SOCK_STREAM) {
516 val &= ~3;
517 val |= inet->tos & 3;
518 }
132adf54
SH		 519 if (inet->tos != val) {
520 inet->tos = val;
521 sk->sk_priority = rt_tos2priority(val);
522 sk_dst_reset(sk);
523 }
524 break;
525 case IP_TTL:
526 if (optlen<1)
527 goto e_inval;
528 if (val != -1 && (val < 1 || val>255))
529 goto e_inval;
530 inet->uc_ttl = val;
531 break;
532 case IP_HDRINCL:
533 if (sk->sk_type != SOCK_RAW) {
534 err = -ENOPROTOOPT;
2c7946a7 535 break;
132adf54
SH		 536 }
537 inet->hdrincl = val ? 1 : 0;
538 break;
539 case IP_MTU_DISCOVER:
628a5c56 540 if (val<0 || val>3)
132adf54
SH		 541 goto e_inval;
542 inet->pmtudisc = val;
543 break;
544 case IP_RECVERR:
545 inet->recverr = !!val;
546 if (!val)
547 skb_queue_purge(&sk->sk_error_queue);
548 break;
549 case IP_MULTICAST_TTL:
550 if (sk->sk_type == SOCK_STREAM)
551 goto e_inval;
552 if (optlen<1)
553 goto e_inval;
554 if (val==-1)
555 val = 1;
556 if (val < 0 || val > 255)
557 goto e_inval;
558 inet->mc_ttl = val;
559 break;
560 case IP_MULTICAST_LOOP:
561 if (optlen<1)
562 goto e_inval;
563 inet->mc_loop = !!val;
564 break;
565 case IP_MULTICAST_IF:
566 {
567 struct ip_mreqn mreq;
568 struct net_device *dev = NULL;
569
570 if (sk->sk_type == SOCK_STREAM)
571 goto e_inval;
572 /*
573 * Check the arguments are allowable
574 */
575
576 err = -EFAULT;
577 if (optlen >= sizeof(struct ip_mreqn)) {
578 if (copy_from_user(&mreq,optval,sizeof(mreq)))
1da177e4 579 break;
132adf54
SH		 580 } else {
581 memset(&mreq, 0, sizeof(mreq));
582 if (optlen >= sizeof(struct in_addr) &&
583 copy_from_user(&mreq.imr_address,optval,sizeof(struct in_addr)))
584 break;
585 }
586
587 if (!mreq.imr_ifindex) {
e6f1cebf 588 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
132adf54
SH		 589 inet->mc_index = 0;
590 inet->mc_addr = 0;
591 err = 0;
1da177e4
LT		 592 break;
593 }
3b1e0a65 594 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
132adf54
SH		 595 if (dev) {
596 mreq.imr_ifindex = dev->ifindex;
597 dev_put(dev);
598 }
599 } else
3b1e0a65 600 dev = __dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
1da177e4 601
1da177e4 602
132adf54
SH		 603 err = -EADDRNOTAVAIL;
604 if (!dev)
605 break;
606
607 err = -EINVAL;
608 if (sk->sk_bound_dev_if &&
609 mreq.imr_ifindex != sk->sk_bound_dev_if)
610 break;
1da177e4 611
132adf54
SH		 612 inet->mc_index = mreq.imr_ifindex;
613 inet->mc_addr = mreq.imr_address.s_addr;
614 err = 0;
615 break;
616 }
1da177e4 617
132adf54
SH		 618 case IP_ADD_MEMBERSHIP:
619 case IP_DROP_MEMBERSHIP:
620 {
621 struct ip_mreqn mreq;
1da177e4 622
a96fb49b
FL		 623 err = -EPROTO;
624 if (inet_sk(sk)->is_icsk)
625 break;
626
132adf54
SH		 627 if (optlen < sizeof(struct ip_mreq))
628 goto e_inval;
629 err = -EFAULT;
630 if (optlen >= sizeof(struct ip_mreqn)) {
631 if (copy_from_user(&mreq,optval,sizeof(mreq)))
1da177e4 632 break;
132adf54
SH		 633 } else {
634 memset(&mreq, 0, sizeof(mreq));
635 if (copy_from_user(&mreq,optval,sizeof(struct ip_mreq)))
1da177e4 636 break;
132adf54 637 }
1da177e4 638
132adf54
SH		 639 if (optname == IP_ADD_MEMBERSHIP)
640 err = ip_mc_join_group(sk, &mreq);
641 else
642 err = ip_mc_leave_group(sk, &mreq);
643 break;
644 }
645 case IP_MSFILTER:
646 {
647 extern int sysctl_igmp_max_msf;
648 struct ip_msfilter *msf;
649
650 if (optlen < IP_MSFILTER_SIZE(0))
651 goto e_inval;
652 if (optlen > sysctl_optmem_max) {
653 err = -ENOBUFS;
1da177e4
LT		 654 break;
655 }
132adf54 656 msf = kmalloc(optlen, GFP_KERNEL);
cfcabdcc 657 if (!msf) {
132adf54
SH		 658 err = -ENOBUFS;
659 break;
660 }
661 err = -EFAULT;
662 if (copy_from_user(msf, optval, optlen)) {
663 kfree(msf);
664 break;
665 }
666 /* numsrc >= (1G-4) overflow in 32 bits */
667 if (msf->imsf_numsrc >= 0x3ffffffcU ||
668 msf->imsf_numsrc > sysctl_igmp_max_msf) {
669 kfree(msf);
670 err = -ENOBUFS;
671 break;
672 }
673 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
674 kfree(msf);
675 err = -EINVAL;
676 break;
677 }
678 err = ip_mc_msfilter(sk, msf, 0);
679 kfree(msf);
680 break;
681 }
682 case IP_BLOCK_SOURCE:
683 case IP_UNBLOCK_SOURCE:
684 case IP_ADD_SOURCE_MEMBERSHIP:
685 case IP_DROP_SOURCE_MEMBERSHIP:
686 {
687 struct ip_mreq_source mreqs;
688 int omode, add;
1da177e4 689
132adf54
SH		 690 if (optlen != sizeof(struct ip_mreq_source))
691 goto e_inval;
692 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
1da177e4 693 err = -EFAULT;
1da177e4
LT		 694 break;
695 }
132adf54
SH		 696 if (optname == IP_BLOCK_SOURCE) {
697 omode = MCAST_EXCLUDE;
698 add = 1;
699 } else if (optname == IP_UNBLOCK_SOURCE) {
700 omode = MCAST_EXCLUDE;
701 add = 0;
702 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
703 struct ip_mreqn mreq;
1da177e4 704
132adf54
SH		 705 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
706 mreq.imr_address.s_addr = mreqs.imr_interface;
707 mreq.imr_ifindex = 0;
708 err = ip_mc_join_group(sk, &mreq);
709 if (err && err != -EADDRINUSE)
1da177e4 710 break;
132adf54
SH		 711 omode = MCAST_INCLUDE;
712 add = 1;
713 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
714 omode = MCAST_INCLUDE;
715 add = 0;
716 }
717 err = ip_mc_source(add, omode, sk, &mreqs, 0);
718 break;
719 }
720 case MCAST_JOIN_GROUP:
721 case MCAST_LEAVE_GROUP:
722 {
723 struct group_req greq;
724 struct sockaddr_in *psin;
725 struct ip_mreqn mreq;
726
727 if (optlen < sizeof(struct group_req))
728 goto e_inval;
729 err = -EFAULT;
730 if (copy_from_user(&greq, optval, sizeof(greq)))
731 break;
732 psin = (struct sockaddr_in *)&greq.gr_group;
733 if (psin->sin_family != AF_INET)
734 goto e_inval;
735 memset(&mreq, 0, sizeof(mreq));
736 mreq.imr_multiaddr = psin->sin_addr;
737 mreq.imr_ifindex = greq.gr_interface;
738
739 if (optname == MCAST_JOIN_GROUP)
740 err = ip_mc_join_group(sk, &mreq);
741 else
742 err = ip_mc_leave_group(sk, &mreq);
743 break;
744 }
745 case MCAST_JOIN_SOURCE_GROUP:
746 case MCAST_LEAVE_SOURCE_GROUP:
747 case MCAST_BLOCK_SOURCE:
748 case MCAST_UNBLOCK_SOURCE:
749 {
750 struct group_source_req greqs;
751 struct ip_mreq_source mreqs;
752 struct sockaddr_in *psin;
753 int omode, add;
754
755 if (optlen != sizeof(struct group_source_req))
756 goto e_inval;
757 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
1da177e4 758 err = -EFAULT;
1da177e4
LT		 759 break;
760 }
132adf54
SH		 761 if (greqs.gsr_group.ss_family != AF_INET ||
762 greqs.gsr_source.ss_family != AF_INET) {
763 err = -EADDRNOTAVAIL;
1da177e4
LT		 764 break;
765 }
132adf54
SH		 766 psin = (struct sockaddr_in *)&greqs.gsr_group;
767 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
768 psin = (struct sockaddr_in *)&greqs.gsr_source;
769 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
770 mreqs.imr_interface = 0; /* use index for mc_source */
771
772 if (optname == MCAST_BLOCK_SOURCE) {
773 omode = MCAST_EXCLUDE;
774 add = 1;
775 } else if (optname == MCAST_UNBLOCK_SOURCE) {
776 omode = MCAST_EXCLUDE;
777 add = 0;
778 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
1da177e4
LT		 779 struct ip_mreqn mreq;
780
132adf54 781 psin = (struct sockaddr_in *)&greqs.gsr_group;
1da177e4 782 mreq.imr_multiaddr = psin->sin_addr;
132adf54
SH		 783 mreq.imr_address.s_addr = 0;
784 mreq.imr_ifindex = greqs.gsr_interface;
785 err = ip_mc_join_group(sk, &mreq);
786 if (err && err != -EADDRINUSE)
787 break;
788 greqs.gsr_interface = mreq.imr_ifindex;
789 omode = MCAST_INCLUDE;
790 add = 1;
791 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
792 omode = MCAST_INCLUDE;
793 add = 0;
794 }
795 err = ip_mc_source(add, omode, sk, &mreqs,
796 greqs.gsr_interface);
797 break;
798 }
799 case MCAST_MSFILTER:
800 {
801 extern int sysctl_igmp_max_msf;
802 struct sockaddr_in *psin;
803 struct ip_msfilter *msf = NULL;
804 struct group_filter *gsf = NULL;
805 int msize, i, ifindex;
806
807 if (optlen < GROUP_FILTER_SIZE(0))
808 goto e_inval;
809 if (optlen > sysctl_optmem_max) {
810 err = -ENOBUFS;
1da177e4
LT		 811 break;
812 }
132adf54 813 gsf = kmalloc(optlen,GFP_KERNEL);
cfcabdcc 814 if (!gsf) {
132adf54 815 err = -ENOBUFS;
1da177e4
LT		 816 break;
817 }
132adf54
SH		 818 err = -EFAULT;
819 if (copy_from_user(gsf, optval, optlen)) {
820 goto mc_msf_out;
821 }
822 /* numsrc >= (4G-140)/128 overflow in 32 bits */
823 if (gsf->gf_numsrc >= 0x1ffffff ||
824 gsf->gf_numsrc > sysctl_igmp_max_msf) {
825 err = -ENOBUFS;
826 goto mc_msf_out;
827 }
828 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
829 err = -EINVAL;
830 goto mc_msf_out;
831 }
832 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
833 msf = kmalloc(msize,GFP_KERNEL);
cfcabdcc 834 if (!msf) {
132adf54
SH		 835 err = -ENOBUFS;
836 goto mc_msf_out;
837 }
838 ifindex = gsf->gf_interface;
839 psin = (struct sockaddr_in *)&gsf->gf_group;
840 if (psin->sin_family != AF_INET) {
1da177e4 841 err = -EADDRNOTAVAIL;
132adf54 842 goto mc_msf_out;
1da177e4 843 }
132adf54
SH		 844 msf->imsf_multiaddr = psin->sin_addr.s_addr;
845 msf->imsf_interface = 0;
846 msf->imsf_fmode = gsf->gf_fmode;
847 msf->imsf_numsrc = gsf->gf_numsrc;
848 err = -EADDRNOTAVAIL;
849 for (i=0; i<gsf->gf_numsrc; ++i) {
850 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
e905a9ed 851
132adf54
SH		 852 if (psin->sin_family != AF_INET)
853 goto mc_msf_out;
854 msf->imsf_slist[i] = psin->sin_addr.s_addr;
855 }
856 kfree(gsf);
857 gsf = NULL;
858
859 err = ip_mc_msfilter(sk, msf, ifindex);
860 mc_msf_out:
861 kfree(msf);
862 kfree(gsf);
863 break;
864 }
865 case IP_ROUTER_ALERT:
866 err = ip_ra_control(sk, val ? 1 : 0, NULL);
867 break;
868
869 case IP_FREEBIND:
870 if (optlen<1)
871 goto e_inval;
872 inet->freebind = !!val;
873 break;
874
875 case IP_IPSEC_POLICY:
876 case IP_XFRM_POLICY:
877 err = -EPERM;
878 if (!capable(CAP_NET_ADMIN))
1da177e4 879 break;
132adf54
SH		 880 err = xfrm_user_policy(sk, optname, optval, optlen);
881 break;
1da177e4 882
132adf54
SH		 883 default:
884 err = -ENOPROTOOPT;
885 break;
1da177e4
LT		 886 }
887 release_sock(sk);
888 return err;
889
890e_inval:
891 release_sock(sk);
892 return -EINVAL;
893}
894
3fdadf7d
DM		 895int ip_setsockopt(struct sock *sk, int level,
896 int optname, char __user *optval, int optlen)
897{
898 int err;
899
900 if (level != SOL_IP)
901 return -ENOPROTOOPT;
902
903 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
904#ifdef CONFIG_NETFILTER
905 /* we need to exclude all possible ENOPROTOOPTs except default case */
906 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
6a9fb947
PE		 907 optname != IP_IPSEC_POLICY &&
908 optname != IP_XFRM_POLICY &&
909 !ip_mroute_opt(optname)) {
3fdadf7d
DM		 910 lock_sock(sk);
911 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
912 release_sock(sk);
913 }
914#endif
915 return err;
916}
917
918#ifdef CONFIG_COMPAT
543d9cfe
ACM		 919int compat_ip_setsockopt(struct sock *sk, int level, int optname,
920 char __user *optval, int optlen)
3fdadf7d
DM		 921{
922 int err;
923
924 if (level != SOL_IP)
925 return -ENOPROTOOPT;
926
dae50295
DS		 927 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
928 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
929 ip_setsockopt);
930
3fdadf7d
DM		 931 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
932#ifdef CONFIG_NETFILTER
933 /* we need to exclude all possible ENOPROTOOPTs except default case */
934 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
6a9fb947
PE		 935 optname != IP_IPSEC_POLICY &&
936 optname != IP_XFRM_POLICY &&
937 !ip_mroute_opt(optname)) {
3fdadf7d 938 lock_sock(sk);
543d9cfe
ACM		 939 err = compat_nf_setsockopt(sk, PF_INET, optname,
940 optval, optlen);
3fdadf7d
DM		 941 release_sock(sk);
942 }
943#endif
944 return err;
945}
543d9cfe
ACM		 946
947EXPORT_SYMBOL(compat_ip_setsockopt);
3fdadf7d
DM		 948#endif
949
1da177e4
LT		 950/*
951 * Get the options. Note for future reference. The GET of IP options gets the
952 * _received_ ones. The set sets the _sent_ ones.
953 */
954
3fdadf7d 955static int do_ip_getsockopt(struct sock *sk, int level, int optname,
132adf54 956 char __user *optval, int __user *optlen)
1da177e4
LT		 957{
958 struct inet_sock *inet = inet_sk(sk);
959 int val;
960 int len;
e905a9ed 961
132adf54 962 if (level != SOL_IP)
1da177e4
LT		 963 return -EOPNOTSUPP;
964
6a9fb947 965 if (ip_mroute_opt(optname))
1da177e4 966 return ip_mroute_getsockopt(sk,optname,optval,optlen);
1da177e4 967
132adf54 968 if (get_user(len,optlen))
1da177e4 969 return -EFAULT;
132adf54 970 if (len < 0)
1da177e4 971 return -EINVAL;
e905a9ed 972
1da177e4
LT		 973 lock_sock(sk);
974
132adf54
SH		 975 switch (optname) {
976 case IP_OPTIONS:
977 {
978 unsigned char optbuf[sizeof(struct ip_options)+40];
979 struct ip_options * opt = (struct ip_options*)optbuf;
980 opt->optlen = 0;
981 if (inet->opt)
982 memcpy(optbuf, inet->opt,
983 sizeof(struct ip_options)+
984 inet->opt->optlen);
985 release_sock(sk);
986
987 if (opt->optlen == 0)
988 return put_user(0, optlen);
989
990 ip_options_undo(opt);
991
992 len = min_t(unsigned int, len, opt->optlen);
993 if (put_user(len, optlen))
994 return -EFAULT;
995 if (copy_to_user(optval, opt->__data, len))
996 return -EFAULT;
997 return 0;
998 }
999 case IP_PKTINFO:
1000 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
1001 break;
1002 case IP_RECVTTL:
1003 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1004 break;
1005 case IP_RECVTOS:
1006 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1007 break;
1008 case IP_RECVOPTS:
1009 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1010 break;
1011 case IP_RETOPTS:
1012 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1013 break;
1014 case IP_PASSSEC:
1015 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1016 break;
1017 case IP_TOS:
1018 val = inet->tos;
1019 break;
1020 case IP_TTL:
1021 val = (inet->uc_ttl == -1 ?
1022 sysctl_ip_default_ttl :
1023 inet->uc_ttl);
1024 break;
1025 case IP_HDRINCL:
1026 val = inet->hdrincl;
1027 break;
1028 case IP_MTU_DISCOVER:
1029 val = inet->pmtudisc;
1030 break;
1031 case IP_MTU:
1032 {
1033 struct dst_entry *dst;
1034 val = 0;
1035 dst = sk_dst_get(sk);
1036 if (dst) {
1037 val = dst_mtu(dst);
1038 dst_release(dst);
1da177e4 1039 }
132adf54 1040 if (!val) {
1da177e4 1041 release_sock(sk);
132adf54 1042 return -ENOTCONN;
1da177e4 1043 }
132adf54
SH		 1044 break;
1045 }
1046 case IP_RECVERR:
1047 val = inet->recverr;
1048 break;
1049 case IP_MULTICAST_TTL:
1050 val = inet->mc_ttl;
1051 break;
1052 case IP_MULTICAST_LOOP:
1053 val = inet->mc_loop;
1054 break;
1055 case IP_MULTICAST_IF:
1056 {
1057 struct in_addr addr;
1058 len = min_t(unsigned int, len, sizeof(struct in_addr));
1059 addr.s_addr = inet->mc_addr;
1060 release_sock(sk);
1da177e4 1061
132adf54
SH		 1062 if (put_user(len, optlen))
1063 return -EFAULT;
1064 if (copy_to_user(optval, &addr, len))
1065 return -EFAULT;
1066 return 0;
1067 }
1068 case IP_MSFILTER:
1069 {
1070 struct ip_msfilter msf;
1071 int err;
1072
1073 if (len < IP_MSFILTER_SIZE(0)) {
1da177e4 1074 release_sock(sk);
132adf54 1075 return -EINVAL;
1da177e4 1076 }
132adf54 1077 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1da177e4 1078 release_sock(sk);
132adf54 1079 return -EFAULT;
1da177e4 1080 }
132adf54
SH		 1081 err = ip_mc_msfget(sk, &msf,
1082 (struct ip_msfilter __user *)optval, optlen);
1083 release_sock(sk);
1084 return err;
1085 }
1086 case MCAST_MSFILTER:
1087 {
1088 struct group_filter gsf;
1089 int err;
1da177e4 1090
132adf54 1091 if (len < GROUP_FILTER_SIZE(0)) {
1da177e4 1092 release_sock(sk);
132adf54
SH		 1093 return -EINVAL;
1094 }
1095 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1096 release_sock(sk);
1097 return -EFAULT;
1098 }
1099 err = ip_mc_gsfget(sk, &gsf,
1100 (struct group_filter __user *)optval, optlen);
1101 release_sock(sk);
1102 return err;
1103 }
1104 case IP_PKTOPTIONS:
1105 {
1106 struct msghdr msg;
1da177e4 1107
132adf54 1108 release_sock(sk);
1da177e4 1109
132adf54
SH		 1110 if (sk->sk_type != SOCK_STREAM)
1111 return -ENOPROTOOPT;
1da177e4 1112
132adf54
SH		 1113 msg.msg_control = optval;
1114 msg.msg_controllen = len;
1115 msg.msg_flags = 0;
1da177e4 1116
132adf54
SH		 1117 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1118 struct in_pktinfo info;
1119
1120 info.ipi_addr.s_addr = inet->rcv_saddr;
1121 info.ipi_spec_dst.s_addr = inet->rcv_saddr;
1122 info.ipi_ifindex = inet->mc_index;
1123 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1da177e4 1124 }
132adf54
SH		 1125 if (inet->cmsg_flags & IP_CMSG_TTL) {
1126 int hlim = inet->mc_ttl;
1127 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1128 }
1129 len -= msg.msg_controllen;
1130 return put_user(len, optlen);
1131 }
1132 case IP_FREEBIND:
1133 val = inet->freebind;
1134 break;
1135 default:
1136 release_sock(sk);
1137 return -ENOPROTOOPT;
1da177e4
LT		 1138 }
1139 release_sock(sk);
e905a9ed 1140
951e07c9 1141 if (len < sizeof(int) && len > 0 && val>=0 && val<=255) {
1da177e4
LT		 1142 unsigned char ucval = (unsigned char)val;
1143 len = 1;
132adf54 1144 if (put_user(len, optlen))
1da177e4 1145 return -EFAULT;
132adf54 1146 if (copy_to_user(optval,&ucval,1))
1da177e4
LT		 1147 return -EFAULT;
1148 } else {
1149 len = min_t(unsigned int, sizeof(int), len);
132adf54 1150 if (put_user(len, optlen))
1da177e4 1151 return -EFAULT;
132adf54 1152 if (copy_to_user(optval,&val,len))
1da177e4
LT		 1153 return -EFAULT;
1154 }
1155 return 0;
1156}
1157
3fdadf7d 1158int ip_getsockopt(struct sock *sk, int level,
132adf54 1159 int optname, char __user *optval, int __user *optlen)
3fdadf7d
DM		 1160{
1161 int err;
1162
1163 err = do_ip_getsockopt(sk, level, optname, optval, optlen);
1164#ifdef CONFIG_NETFILTER
1165 /* we need to exclude all possible ENOPROTOOPTs except default case */
6a9fb947
PE		 1166 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1167 !ip_mroute_opt(optname)) {
e905a9ed 1168 int len;
3fdadf7d 1169
132adf54 1170 if (get_user(len,optlen))
3fdadf7d
DM		 1171 return -EFAULT;
1172
1173 lock_sock(sk);
1174 err = nf_getsockopt(sk, PF_INET, optname, optval,
1175 &len);
1176 release_sock(sk);
1177 if (err >= 0)
1178 err = put_user(len, optlen);
1179 return err;
1180 }
1181#endif
1182 return err;
1183}
1184
1185#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1186int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1187 char __user *optval, int __user *optlen)
3fdadf7d 1188{
543d9cfe 1189 int err = do_ip_getsockopt(sk, level, optname, optval, optlen);
3fdadf7d
DM		 1190#ifdef CONFIG_NETFILTER
1191 /* we need to exclude all possible ENOPROTOOPTs except default case */
6a9fb947
PE		 1192 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1193 !ip_mroute_opt(optname)) {
e905a9ed 1194 int len;
3fdadf7d 1195
543d9cfe 1196 if (get_user(len, optlen))
3fdadf7d
DM		 1197 return -EFAULT;
1198
1199 lock_sock(sk);
543d9cfe 1200 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
3fdadf7d
DM		 1201 release_sock(sk);
1202 if (err >= 0)
1203 err = put_user(len, optlen);
1204 return err;
1205 }
1206#endif
1207 return err;
1208}
543d9cfe
ACM		 1209
1210EXPORT_SYMBOL(compat_ip_getsockopt);
3fdadf7d
DM		 1211#endif
1212
1da177e4
LT		 1213EXPORT_SYMBOL(ip_cmsg_recv);
1214
1da177e4
LT		 1215EXPORT_SYMBOL(ip_getsockopt);
1216EXPORT_SYMBOL(ip_setsockopt);
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