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[TCP]: Move the TCPF_ enum to tcp_states.h
[linux.git] / net / ipv4 / ip_sockglue.c
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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.
7 *
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.
15 * Alan Cox : Fixed a couple of oopses in Martin's
16 * TOS tweaks.
17 * Mike McLagan : Routing by source
18 */
19
20#include <linux/config.h>
21#include <linux/module.h>
22#include <linux/types.h>
23#include <linux/mm.h>
24#include <linux/sched.h>
25#include <linux/skbuff.h>
26#include <linux/ip.h>
27#include <linux/icmp.h>
28#include <linux/netdevice.h>
29#include <net/sock.h>
30#include <net/ip.h>
31#include <net/icmp.h>
32#include <net/tcp.h>
33#include <linux/tcp.h>
34#include <linux/udp.h>
35#include <linux/igmp.h>
36#include <linux/netfilter.h>
37#include <linux/route.h>
38#include <linux/mroute.h>
39#include <net/route.h>
40#include <net/xfrm.h>
41#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
42#include <net/transp_v6.h>
43#endif
44
45#include <linux/errqueue.h>
46#include <asm/uaccess.h>
47
48#define IP_CMSG_PKTINFO 1
49#define IP_CMSG_TTL 2
50#define IP_CMSG_TOS 4
51#define IP_CMSG_RECVOPTS 8
52#define IP_CMSG_RETOPTS 16
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;
61 struct rtable *rt = (struct rtable *)skb->dst;
62
63 info.ipi_addr.s_addr = skb->nh.iph->daddr;
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{
77 int ttl = skb->nh.iph->ttl;
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{
83 put_cmsg(msg, SOL_IP, IP_TOS, 1, &skb->nh.iph->tos);
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
91 put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen, skb->nh.iph+1);
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
112
113void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
114{
115 struct inet_sock *inet = inet_sk(skb->sk);
116 unsigned flags = inet->cmsg_flags;
117
118 /* Ordered by supposed usage frequency */
119 if (flags & 1)
120 ip_cmsg_recv_pktinfo(msg, skb);
121 if ((flags>>=1) == 0)
122 return;
123
124 if (flags & 1)
125 ip_cmsg_recv_ttl(msg, skb);
126 if ((flags>>=1) == 0)
127 return;
128
129 if (flags & 1)
130 ip_cmsg_recv_tos(msg, skb);
131 if ((flags>>=1) == 0)
132 return;
133
134 if (flags & 1)
135 ip_cmsg_recv_opts(msg, skb);
136 if ((flags>>=1) == 0)
137 return;
138
139 if (flags & 1)
140 ip_cmsg_recv_retopts(msg, skb);
141}
142
143int ip_cmsg_send(struct msghdr *msg, struct ipcm_cookie *ipc)
144{
145 int err;
146 struct cmsghdr *cmsg;
147
148 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
149 if (!CMSG_OK(msg, cmsg))
150 return -EINVAL;
151 if (cmsg->cmsg_level != SOL_IP)
152 continue;
153 switch (cmsg->cmsg_type) {
154 case IP_RETOPTS:
155 err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
4c6ea29d 156 err = ip_options_get(&ipc->opt, CMSG_DATA(cmsg), err < 40 ? err : 40);
1da177e4
LT		 157 if (err)
158 return err;
159 break;
160 case IP_PKTINFO:
161 {
162 struct in_pktinfo *info;
163 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
164 return -EINVAL;
165 info = (struct in_pktinfo *)CMSG_DATA(cmsg);
166 ipc->oif = info->ipi_ifindex;
167 ipc->addr = info->ipi_spec_dst.s_addr;
168 break;
169 }
170 default:
171 return -EINVAL;
172 }
173 }
174 return 0;
175}
176
177
178/* Special input handler for packets caught by router alert option.
179 They are selected only by protocol field, and then processed likely
180 local ones; but only if someone wants them! Otherwise, router
181 not running rsvpd will kill RSVP.
182
183 It is user level problem, what it will make with them.
184 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
185 but receiver should be enough clever f.e. to forward mtrace requests,
186 sent to multicast group to reach destination designated router.
187 */
188struct ip_ra_chain *ip_ra_chain;
189DEFINE_RWLOCK(ip_ra_lock);
190
191int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *))
192{
193 struct ip_ra_chain *ra, *new_ra, **rap;
194
195 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num == IPPROTO_RAW)
196 return -EINVAL;
197
198 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
199
200 write_lock_bh(&ip_ra_lock);
201 for (rap = &ip_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
202 if (ra->sk == sk) {
203 if (on) {
204 write_unlock_bh(&ip_ra_lock);
a51482bd 205 kfree(new_ra);
1da177e4
LT		 206 return -EADDRINUSE;
207 }
208 *rap = ra->next;
209 write_unlock_bh(&ip_ra_lock);
210
211 if (ra->destructor)
212 ra->destructor(sk);
213 sock_put(sk);
214 kfree(ra);
215 return 0;
216 }
217 }
218 if (new_ra == NULL) {
219 write_unlock_bh(&ip_ra_lock);
220 return -ENOBUFS;
221 }
222 new_ra->sk = sk;
223 new_ra->destructor = destructor;
224
225 new_ra->next = ra;
226 *rap = new_ra;
227 sock_hold(sk);
228 write_unlock_bh(&ip_ra_lock);
229
230 return 0;
231}
232
233void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
234 u16 port, u32 info, u8 *payload)
235{
236 struct inet_sock *inet = inet_sk(sk);
237 struct sock_exterr_skb *serr;
238
239 if (!inet->recverr)
240 return;
241
242 skb = skb_clone(skb, GFP_ATOMIC);
243 if (!skb)
244 return;
245
246 serr = SKB_EXT_ERR(skb);
247 serr->ee.ee_errno = err;
248 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
249 serr->ee.ee_type = skb->h.icmph->type;
250 serr->ee.ee_code = skb->h.icmph->code;
251 serr->ee.ee_pad = 0;
252 serr->ee.ee_info = info;
253 serr->ee.ee_data = 0;
254 serr->addr_offset = (u8*)&(((struct iphdr*)(skb->h.icmph+1))->daddr) - skb->nh.raw;
255 serr->port = port;
256
257 skb->h.raw = payload;
258 if (!skb_pull(skb, payload - skb->data) ||
259 sock_queue_err_skb(sk, skb))
260 kfree_skb(skb);
261}
262
263void ip_local_error(struct sock *sk, int err, u32 daddr, u16 port, u32 info)
264{
265 struct inet_sock *inet = inet_sk(sk);
266 struct sock_exterr_skb *serr;
267 struct iphdr *iph;
268 struct sk_buff *skb;
269
270 if (!inet->recverr)
271 return;
272
273 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
274 if (!skb)
275 return;
276
277 iph = (struct iphdr*)skb_put(skb, sizeof(struct iphdr));
278 skb->nh.iph = iph;
279 iph->daddr = daddr;
280
281 serr = SKB_EXT_ERR(skb);
282 serr->ee.ee_errno = err;
283 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
284 serr->ee.ee_type = 0;
285 serr->ee.ee_code = 0;
286 serr->ee.ee_pad = 0;
287 serr->ee.ee_info = info;
288 serr->ee.ee_data = 0;
289 serr->addr_offset = (u8*)&iph->daddr - skb->nh.raw;
290 serr->port = port;
291
292 skb->h.raw = skb->tail;
293 __skb_pull(skb, skb->tail - skb->data);
294
295 if (sock_queue_err_skb(sk, skb))
296 kfree_skb(skb);
297}
298
299/*
300 * Handle MSG_ERRQUEUE
301 */
302int ip_recv_error(struct sock *sk, struct msghdr *msg, int len)
303{
304 struct sock_exterr_skb *serr;
305 struct sk_buff *skb, *skb2;
306 struct sockaddr_in *sin;
307 struct {
308 struct sock_extended_err ee;
309 struct sockaddr_in offender;
310 } errhdr;
311 int err;
312 int copied;
313
314 err = -EAGAIN;
315 skb = skb_dequeue(&sk->sk_error_queue);
316 if (skb == NULL)
317 goto out;
318
319 copied = skb->len;
320 if (copied > len) {
321 msg->msg_flags |= MSG_TRUNC;
322 copied = len;
323 }
324 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
325 if (err)
326 goto out_free_skb;
327
328 sock_recv_timestamp(msg, sk, skb);
329
330 serr = SKB_EXT_ERR(skb);
331
332 sin = (struct sockaddr_in *)msg->msg_name;
333 if (sin) {
334 sin->sin_family = AF_INET;
335 sin->sin_addr.s_addr = *(u32*)(skb->nh.raw + serr->addr_offset);
336 sin->sin_port = serr->port;
337 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
338 }
339
340 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
341 sin = &errhdr.offender;
342 sin->sin_family = AF_UNSPEC;
343 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
344 struct inet_sock *inet = inet_sk(sk);
345
346 sin->sin_family = AF_INET;
347 sin->sin_addr.s_addr = skb->nh.iph->saddr;
348 sin->sin_port = 0;
349 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
350 if (inet->cmsg_flags)
351 ip_cmsg_recv(msg, skb);
352 }
353
354 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
355
356 /* Now we could try to dump offended packet options */
357
358 msg->msg_flags |= MSG_ERRQUEUE;
359 err = copied;
360
361 /* Reset and regenerate socket error */
e0f9f858 362 spin_lock_bh(&sk->sk_error_queue.lock);
1da177e4
LT		 363 sk->sk_err = 0;
364 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
365 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
e0f9f858 366 spin_unlock_bh(&sk->sk_error_queue.lock);
1da177e4
LT		 367 sk->sk_error_report(sk);
368 } else
e0f9f858 369 spin_unlock_bh(&sk->sk_error_queue.lock);
1da177e4
LT		 370
371out_free_skb:
372 kfree_skb(skb);
373out:
374 return err;
375}
376
377
378/*
379 * Socket option code for IP. This is the end of the line after any TCP,UDP etc options on
380 * an IP socket.
381 */
382
383int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, int optlen)
384{
385 struct inet_sock *inet = inet_sk(sk);
386 int val=0,err;
387
388 if (level != SOL_IP)
389 return -ENOPROTOOPT;
390
391 if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) |
392 (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) |
393 (1<<IP_RETOPTS) | (1<<IP_TOS) |
394 (1<<IP_TTL) | (1<<IP_HDRINCL) |
395 (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) |
396 (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND))) ||
397 optname == IP_MULTICAST_TTL ||
398 optname == IP_MULTICAST_LOOP) {
399 if (optlen >= sizeof(int)) {
400 if (get_user(val, (int __user *) optval))
401 return -EFAULT;
402 } else if (optlen >= sizeof(char)) {
403 unsigned char ucval;
404
405 if (get_user(ucval, (unsigned char __user *) optval))
406 return -EFAULT;
407 val = (int) ucval;
408 }
409 }
410
411 /* If optlen==0, it is equivalent to val == 0 */
412
413#ifdef CONFIG_IP_MROUTE
414 if (optname >= MRT_BASE && optname <= (MRT_BASE + 10))
415 return ip_mroute_setsockopt(sk,optname,optval,optlen);
416#endif
417
418 err = 0;
419 lock_sock(sk);
420
421 switch (optname) {
422 case IP_OPTIONS:
423 {
424 struct ip_options * opt = NULL;
425 if (optlen > 40 || optlen < 0)
426 goto e_inval;
4c6ea29d 427 err = ip_options_get_from_user(&opt, optval, optlen);
1da177e4
LT		 428 if (err)
429 break;
430 if (sk->sk_type == SOCK_STREAM) {
431 struct tcp_sock *tp = tcp_sk(sk);
432#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
433 if (sk->sk_family == PF_INET ||
434 (!((1 << sk->sk_state) &
435 (TCPF_LISTEN | TCPF_CLOSE)) &&
436 inet->daddr != LOOPBACK4_IPV6)) {
437#endif
438 if (inet->opt)
439 tp->ext_header_len -= inet->opt->optlen;
440 if (opt)
441 tp->ext_header_len += opt->optlen;
442 tcp_sync_mss(sk, tp->pmtu_cookie);
443#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
444 }
445#endif
446 }
447 opt = xchg(&inet->opt, opt);
a51482bd 448 kfree(opt);
1da177e4
LT		 449 break;
450 }
451 case IP_PKTINFO:
452 if (val)
453 inet->cmsg_flags |= IP_CMSG_PKTINFO;
454 else
455 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
456 break;
457 case IP_RECVTTL:
458 if (val)
459 inet->cmsg_flags |= IP_CMSG_TTL;
460 else
461 inet->cmsg_flags &= ~IP_CMSG_TTL;
462 break;
463 case IP_RECVTOS:
464 if (val)
465 inet->cmsg_flags |= IP_CMSG_TOS;
466 else
467 inet->cmsg_flags &= ~IP_CMSG_TOS;
468 break;
469 case IP_RECVOPTS:
470 if (val)
471 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
472 else
473 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
474 break;
475 case IP_RETOPTS:
476 if (val)
477 inet->cmsg_flags |= IP_CMSG_RETOPTS;
478 else
479 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
480 break;
481 case IP_TOS: /* This sets both TOS and Precedence */
482 if (sk->sk_type == SOCK_STREAM) {
483 val &= ~3;
484 val |= inet->tos & 3;
485 }
486 if (IPTOS_PREC(val) >= IPTOS_PREC_CRITIC_ECP &&
487 !capable(CAP_NET_ADMIN)) {
488 err = -EPERM;
489 break;
490 }
491 if (inet->tos != val) {
492 inet->tos = val;
493 sk->sk_priority = rt_tos2priority(val);
494 sk_dst_reset(sk);
495 }
496 break;
497 case IP_TTL:
498 if (optlen<1)
499 goto e_inval;
500 if (val != -1 && (val < 1 || val>255))
501 goto e_inval;
502 inet->uc_ttl = val;
503 break;
504 case IP_HDRINCL:
505 if (sk->sk_type != SOCK_RAW) {
506 err = -ENOPROTOOPT;
507 break;
508 }
509 inet->hdrincl = val ? 1 : 0;
510 break;
511 case IP_MTU_DISCOVER:
512 if (val<0 || val>2)
513 goto e_inval;
514 inet->pmtudisc = val;
515 break;
516 case IP_RECVERR:
517 inet->recverr = !!val;
518 if (!val)
519 skb_queue_purge(&sk->sk_error_queue);
520 break;
521 case IP_MULTICAST_TTL:
522 if (sk->sk_type == SOCK_STREAM)
523 goto e_inval;
524 if (optlen<1)
525 goto e_inval;
526 if (val==-1)
527 val = 1;
528 if (val < 0 || val > 255)
529 goto e_inval;
530 inet->mc_ttl = val;
531 break;
532 case IP_MULTICAST_LOOP:
533 if (optlen<1)
534 goto e_inval;
535 inet->mc_loop = !!val;
536 break;
537 case IP_MULTICAST_IF:
538 {
539 struct ip_mreqn mreq;
540 struct net_device *dev = NULL;
541
542 if (sk->sk_type == SOCK_STREAM)
543 goto e_inval;
544 /*
545 * Check the arguments are allowable
546 */
547
548 err = -EFAULT;
549 if (optlen >= sizeof(struct ip_mreqn)) {
550 if (copy_from_user(&mreq,optval,sizeof(mreq)))
551 break;
552 } else {
553 memset(&mreq, 0, sizeof(mreq));
554 if (optlen >= sizeof(struct in_addr) &&
555 copy_from_user(&mreq.imr_address,optval,sizeof(struct in_addr)))
556 break;
557 }
558
559 if (!mreq.imr_ifindex) {
560 if (mreq.imr_address.s_addr == INADDR_ANY) {
561 inet->mc_index = 0;
562 inet->mc_addr = 0;
563 err = 0;
564 break;
565 }
566 dev = ip_dev_find(mreq.imr_address.s_addr);
567 if (dev) {
568 mreq.imr_ifindex = dev->ifindex;
569 dev_put(dev);
570 }
571 } else
572 dev = __dev_get_by_index(mreq.imr_ifindex);
573
574
575 err = -EADDRNOTAVAIL;
576 if (!dev)
577 break;
578
579 err = -EINVAL;
580 if (sk->sk_bound_dev_if &&
581 mreq.imr_ifindex != sk->sk_bound_dev_if)
582 break;
583
584 inet->mc_index = mreq.imr_ifindex;
585 inet->mc_addr = mreq.imr_address.s_addr;
586 err = 0;
587 break;
588 }
589
590 case IP_ADD_MEMBERSHIP:
591 case IP_DROP_MEMBERSHIP:
592 {
593 struct ip_mreqn mreq;
594
595 if (optlen < sizeof(struct ip_mreq))
596 goto e_inval;
597 err = -EFAULT;
598 if (optlen >= sizeof(struct ip_mreqn)) {
599 if(copy_from_user(&mreq,optval,sizeof(mreq)))
600 break;
601 } else {
602 memset(&mreq, 0, sizeof(mreq));
603 if (copy_from_user(&mreq,optval,sizeof(struct ip_mreq)))
604 break;
605 }
606
607 if (optname == IP_ADD_MEMBERSHIP)
608 err = ip_mc_join_group(sk, &mreq);
609 else
610 err = ip_mc_leave_group(sk, &mreq);
611 break;
612 }
613 case IP_MSFILTER:
614 {
1da177e4
LT		 615 extern int sysctl_igmp_max_msf;
616 struct ip_msfilter *msf;
617
618 if (optlen < IP_MSFILTER_SIZE(0))
619 goto e_inval;
620 if (optlen > sysctl_optmem_max) {
621 err = -ENOBUFS;
622 break;
623 }
624 msf = (struct ip_msfilter *)kmalloc(optlen, GFP_KERNEL);
625 if (msf == 0) {
626 err = -ENOBUFS;
627 break;
628 }
629 err = -EFAULT;
630 if (copy_from_user(msf, optval, optlen)) {
631 kfree(msf);
632 break;
633 }
634 /* numsrc >= (1G-4) overflow in 32 bits */
635 if (msf->imsf_numsrc >= 0x3ffffffcU ||
636 msf->imsf_numsrc > sysctl_igmp_max_msf) {
637 kfree(msf);
638 err = -ENOBUFS;
639 break;
640 }
641 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
642 kfree(msf);
643 err = -EINVAL;
644 break;
645 }
646 err = ip_mc_msfilter(sk, msf, 0);
647 kfree(msf);
648 break;
649 }
650 case IP_BLOCK_SOURCE:
651 case IP_UNBLOCK_SOURCE:
652 case IP_ADD_SOURCE_MEMBERSHIP:
653 case IP_DROP_SOURCE_MEMBERSHIP:
654 {
655 struct ip_mreq_source mreqs;
656 int omode, add;
657
658 if (optlen != sizeof(struct ip_mreq_source))
659 goto e_inval;
660 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
661 err = -EFAULT;
662 break;
663 }
664 if (optname == IP_BLOCK_SOURCE) {
665 omode = MCAST_EXCLUDE;
666 add = 1;
667 } else if (optname == IP_UNBLOCK_SOURCE) {
668 omode = MCAST_EXCLUDE;
669 add = 0;
670 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
671 struct ip_mreqn mreq;
672
673 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
674 mreq.imr_address.s_addr = mreqs.imr_interface;
675 mreq.imr_ifindex = 0;
676 err = ip_mc_join_group(sk, &mreq);
8cdaaa15 677 if (err && err != -EADDRINUSE)
1da177e4
LT		 678 break;
679 omode = MCAST_INCLUDE;
680 add = 1;
8cdaaa15 681 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
1da177e4
LT		 682 omode = MCAST_INCLUDE;
683 add = 0;
684 }
685 err = ip_mc_source(add, omode, sk, &mreqs, 0);
686 break;
687 }
688 case MCAST_JOIN_GROUP:
689 case MCAST_LEAVE_GROUP:
690 {
691 struct group_req greq;
692 struct sockaddr_in *psin;
693 struct ip_mreqn mreq;
694
695 if (optlen < sizeof(struct group_req))
696 goto e_inval;
697 err = -EFAULT;
698 if(copy_from_user(&greq, optval, sizeof(greq)))
699 break;
700 psin = (struct sockaddr_in *)&greq.gr_group;
701 if (psin->sin_family != AF_INET)
702 goto e_inval;
703 memset(&mreq, 0, sizeof(mreq));
704 mreq.imr_multiaddr = psin->sin_addr;
705 mreq.imr_ifindex = greq.gr_interface;
706
707 if (optname == MCAST_JOIN_GROUP)
708 err = ip_mc_join_group(sk, &mreq);
709 else
710 err = ip_mc_leave_group(sk, &mreq);
711 break;
712 }
713 case MCAST_JOIN_SOURCE_GROUP:
714 case MCAST_LEAVE_SOURCE_GROUP:
715 case MCAST_BLOCK_SOURCE:
716 case MCAST_UNBLOCK_SOURCE:
717 {
718 struct group_source_req greqs;
719 struct ip_mreq_source mreqs;
720 struct sockaddr_in *psin;
721 int omode, add;
722
723 if (optlen != sizeof(struct group_source_req))
724 goto e_inval;
725 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
726 err = -EFAULT;
727 break;
728 }
729 if (greqs.gsr_group.ss_family != AF_INET ||
730 greqs.gsr_source.ss_family != AF_INET) {
731 err = -EADDRNOTAVAIL;
732 break;
733 }
734 psin = (struct sockaddr_in *)&greqs.gsr_group;
735 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
736 psin = (struct sockaddr_in *)&greqs.gsr_source;
737 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
738 mreqs.imr_interface = 0; /* use index for mc_source */
739
740 if (optname == MCAST_BLOCK_SOURCE) {
741 omode = MCAST_EXCLUDE;
742 add = 1;
743 } else if (optname == MCAST_UNBLOCK_SOURCE) {
744 omode = MCAST_EXCLUDE;
745 add = 0;
746 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
747 struct ip_mreqn mreq;
748
749 psin = (struct sockaddr_in *)&greqs.gsr_group;
750 mreq.imr_multiaddr = psin->sin_addr;
751 mreq.imr_address.s_addr = 0;
752 mreq.imr_ifindex = greqs.gsr_interface;
753 err = ip_mc_join_group(sk, &mreq);
8cdaaa15 754 if (err && err != -EADDRINUSE)
1da177e4
LT		 755 break;
756 greqs.gsr_interface = mreq.imr_ifindex;
757 omode = MCAST_INCLUDE;
758 add = 1;
759 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
760 omode = MCAST_INCLUDE;
761 add = 0;
762 }
763 err = ip_mc_source(add, omode, sk, &mreqs,
764 greqs.gsr_interface);
765 break;
766 }
767 case MCAST_MSFILTER:
768 {
1da177e4
LT		 769 extern int sysctl_igmp_max_msf;
770 struct sockaddr_in *psin;
771 struct ip_msfilter *msf = NULL;
772 struct group_filter *gsf = NULL;
773 int msize, i, ifindex;
774
775 if (optlen < GROUP_FILTER_SIZE(0))
776 goto e_inval;
777 if (optlen > sysctl_optmem_max) {
778 err = -ENOBUFS;
779 break;
780 }
781 gsf = (struct group_filter *)kmalloc(optlen,GFP_KERNEL);
782 if (gsf == 0) {
783 err = -ENOBUFS;
784 break;
785 }
786 err = -EFAULT;
787 if (copy_from_user(gsf, optval, optlen)) {
788 goto mc_msf_out;
789 }
790 /* numsrc >= (4G-140)/128 overflow in 32 bits */
791 if (gsf->gf_numsrc >= 0x1ffffff ||
792 gsf->gf_numsrc > sysctl_igmp_max_msf) {
793 err = -ENOBUFS;
794 goto mc_msf_out;
795 }
796 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
797 err = -EINVAL;
798 goto mc_msf_out;
799 }
800 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
801 msf = (struct ip_msfilter *)kmalloc(msize,GFP_KERNEL);
802 if (msf == 0) {
803 err = -ENOBUFS;
804 goto mc_msf_out;
805 }
806 ifindex = gsf->gf_interface;
807 psin = (struct sockaddr_in *)&gsf->gf_group;
808 if (psin->sin_family != AF_INET) {
809 err = -EADDRNOTAVAIL;
810 goto mc_msf_out;
811 }
812 msf->imsf_multiaddr = psin->sin_addr.s_addr;
813 msf->imsf_interface = 0;
814 msf->imsf_fmode = gsf->gf_fmode;
815 msf->imsf_numsrc = gsf->gf_numsrc;
816 err = -EADDRNOTAVAIL;
817 for (i=0; i<gsf->gf_numsrc; ++i) {
818 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
819
820 if (psin->sin_family != AF_INET)
821 goto mc_msf_out;
822 msf->imsf_slist[i] = psin->sin_addr.s_addr;
823 }
824 kfree(gsf);
825 gsf = NULL;
826
827 err = ip_mc_msfilter(sk, msf, ifindex);
828mc_msf_out:
a51482bd
JJ		 829 kfree(msf);
830 kfree(gsf);
1da177e4
LT		 831 break;
832 }
833 case IP_ROUTER_ALERT:
834 err = ip_ra_control(sk, val ? 1 : 0, NULL);
835 break;
836
837 case IP_FREEBIND:
838 if (optlen<1)
839 goto e_inval;
840 inet->freebind = !!val;
841 break;
842
843 case IP_IPSEC_POLICY:
844 case IP_XFRM_POLICY:
6fc0b4a7
HX		 845 err = -EPERM;
846 if (!capable(CAP_NET_ADMIN))
847 break;
1da177e4
LT		 848 err = xfrm_user_policy(sk, optname, optval, optlen);
849 break;
850
851 default:
852#ifdef CONFIG_NETFILTER
853 err = nf_setsockopt(sk, PF_INET, optname, optval,
854 optlen);
855#else
856 err = -ENOPROTOOPT;
857#endif
858 break;
859 }
860 release_sock(sk);
861 return err;
862
863e_inval:
864 release_sock(sk);
865 return -EINVAL;
866}
867
868/*
869 * Get the options. Note for future reference. The GET of IP options gets the
870 * _received_ ones. The set sets the _sent_ ones.
871 */
872
873int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen)
874{
875 struct inet_sock *inet = inet_sk(sk);
876 int val;
877 int len;
878
879 if(level!=SOL_IP)
880 return -EOPNOTSUPP;
881
882#ifdef CONFIG_IP_MROUTE
883 if(optname>=MRT_BASE && optname <=MRT_BASE+10)
884 {
885 return ip_mroute_getsockopt(sk,optname,optval,optlen);
886 }
887#endif
888
889 if(get_user(len,optlen))
890 return -EFAULT;
891 if(len < 0)
892 return -EINVAL;
893
894 lock_sock(sk);
895
896 switch(optname) {
897 case IP_OPTIONS:
898 {
899 unsigned char optbuf[sizeof(struct ip_options)+40];
900 struct ip_options * opt = (struct ip_options*)optbuf;
901 opt->optlen = 0;
902 if (inet->opt)
903 memcpy(optbuf, inet->opt,
904 sizeof(struct ip_options)+
905 inet->opt->optlen);
906 release_sock(sk);
907
908 if (opt->optlen == 0)
909 return put_user(0, optlen);
910
911 ip_options_undo(opt);
912
913 len = min_t(unsigned int, len, opt->optlen);
914 if(put_user(len, optlen))
915 return -EFAULT;
916 if(copy_to_user(optval, opt->__data, len))
917 return -EFAULT;
918 return 0;
919 }
920 case IP_PKTINFO:
921 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
922 break;
923 case IP_RECVTTL:
924 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
925 break;
926 case IP_RECVTOS:
927 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
928 break;
929 case IP_RECVOPTS:
930 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
931 break;
932 case IP_RETOPTS:
933 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
934 break;
935 case IP_TOS:
936 val = inet->tos;
937 break;
938 case IP_TTL:
939 val = (inet->uc_ttl == -1 ?
940 sysctl_ip_default_ttl :
941 inet->uc_ttl);
942 break;
943 case IP_HDRINCL:
944 val = inet->hdrincl;
945 break;
946 case IP_MTU_DISCOVER:
947 val = inet->pmtudisc;
948 break;
949 case IP_MTU:
950 {
951 struct dst_entry *dst;
952 val = 0;
953 dst = sk_dst_get(sk);
954 if (dst) {
955 val = dst_mtu(dst);
956 dst_release(dst);
957 }
958 if (!val) {
959 release_sock(sk);
960 return -ENOTCONN;
961 }
962 break;
963 }
964 case IP_RECVERR:
965 val = inet->recverr;
966 break;
967 case IP_MULTICAST_TTL:
968 val = inet->mc_ttl;
969 break;
970 case IP_MULTICAST_LOOP:
971 val = inet->mc_loop;
972 break;
973 case IP_MULTICAST_IF:
974 {
975 struct in_addr addr;
976 len = min_t(unsigned int, len, sizeof(struct in_addr));
977 addr.s_addr = inet->mc_addr;
978 release_sock(sk);
979
980 if(put_user(len, optlen))
981 return -EFAULT;
982 if(copy_to_user(optval, &addr, len))
983 return -EFAULT;
984 return 0;
985 }
986 case IP_MSFILTER:
987 {
988 struct ip_msfilter msf;
989 int err;
990
991 if (len < IP_MSFILTER_SIZE(0)) {
992 release_sock(sk);
993 return -EINVAL;
994 }
995 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
996 release_sock(sk);
997 return -EFAULT;
998 }
999 err = ip_mc_msfget(sk, &msf,
1000 (struct ip_msfilter __user *)optval, optlen);
1001 release_sock(sk);
1002 return err;
1003 }
1004 case MCAST_MSFILTER:
1005 {
1006 struct group_filter gsf;
1007 int err;
1008
1009 if (len < GROUP_FILTER_SIZE(0)) {
1010 release_sock(sk);
1011 return -EINVAL;
1012 }
1013 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1014 release_sock(sk);
1015 return -EFAULT;
1016 }
1017 err = ip_mc_gsfget(sk, &gsf,
1018 (struct group_filter __user *)optval, optlen);
1019 release_sock(sk);
1020 return err;
1021 }
1022 case IP_PKTOPTIONS:
1023 {
1024 struct msghdr msg;
1025
1026 release_sock(sk);
1027
1028 if (sk->sk_type != SOCK_STREAM)
1029 return -ENOPROTOOPT;
1030
1031 msg.msg_control = optval;
1032 msg.msg_controllen = len;
1033 msg.msg_flags = 0;
1034
1035 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1036 struct in_pktinfo info;
1037
1038 info.ipi_addr.s_addr = inet->rcv_saddr;
1039 info.ipi_spec_dst.s_addr = inet->rcv_saddr;
1040 info.ipi_ifindex = inet->mc_index;
1041 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1042 }
1043 if (inet->cmsg_flags & IP_CMSG_TTL) {
1044 int hlim = inet->mc_ttl;
1045 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1046 }
1047 len -= msg.msg_controllen;
1048 return put_user(len, optlen);
1049 }
1050 case IP_FREEBIND:
1051 val = inet->freebind;
1052 break;
1053 default:
1054#ifdef CONFIG_NETFILTER
1055 val = nf_getsockopt(sk, PF_INET, optname, optval,
1056 &len);
1057 release_sock(sk);
1058 if (val >= 0)
1059 val = put_user(len, optlen);
1060 return val;
1061#else
1062 release_sock(sk);
1063 return -ENOPROTOOPT;
1064#endif
1065 }
1066 release_sock(sk);
1067
1068 if (len < sizeof(int) && len > 0 && val>=0 && val<255) {
1069 unsigned char ucval = (unsigned char)val;
1070 len = 1;
1071 if(put_user(len, optlen))
1072 return -EFAULT;
1073 if(copy_to_user(optval,&ucval,1))
1074 return -EFAULT;
1075 } else {
1076 len = min_t(unsigned int, sizeof(int), len);
1077 if(put_user(len, optlen))
1078 return -EFAULT;
1079 if(copy_to_user(optval,&val,len))
1080 return -EFAULT;
1081 }
1082 return 0;
1083}
1084
1085EXPORT_SYMBOL(ip_cmsg_recv);
1086
1da177e4
LT		 1087EXPORT_SYMBOL(ip_getsockopt);
1088EXPORT_SYMBOL(ip_setsockopt);
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