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Linux 2.6.33-rc8
[linux-2.6/lguest.git] / net / ipv4 / ip_sockglue.c
blobcafad9baff039b8c164e2da282a754c6822294a8
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 * Authors: see ip.c
9 *
10 * Fixes:
11 * Many : Split from ip.c , see ip.c for history.
12 * Martin Mares : TOS setting fixed.
13 * Alan Cox : Fixed a couple of oopses in Martin's
14 * TOS tweaks.
15 * Mike McLagan : Routing by source
16 */
17
18 #include <linux/module.h>
19 #include <linux/types.h>
20 #include <linux/mm.h>
21 #include <linux/skbuff.h>
22 #include <linux/ip.h>
23 #include <linux/icmp.h>
24 #include <linux/inetdevice.h>
25 #include <linux/netdevice.h>
26 #include <net/sock.h>
27 #include <net/ip.h>
28 #include <net/icmp.h>
29 #include <net/tcp_states.h>
30 #include <linux/udp.h>
31 #include <linux/igmp.h>
32 #include <linux/netfilter.h>
33 #include <linux/route.h>
34 #include <linux/mroute.h>
35 #include <net/route.h>
36 #include <net/xfrm.h>
37 #include <net/compat.h>
38 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
39 #include <net/transp_v6.h>
40 #endif
41
42 #include <linux/errqueue.h>
43 #include <asm/uaccess.h>
44
45 #define IP_CMSG_PKTINFO 1
46 #define IP_CMSG_TTL 2
47 #define IP_CMSG_TOS 4
48 #define IP_CMSG_RECVOPTS 8
49 #define IP_CMSG_RETOPTS 16
50 #define IP_CMSG_PASSSEC 32
51 #define IP_CMSG_ORIGDSTADDR 64
52
53 /*
54 * SOL_IP control messages.
55 */
56
57 static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
58 {
59 struct in_pktinfo info;
60 struct rtable *rt = skb_rtable(skb);
61
62 info.ipi_addr.s_addr = ip_hdr(skb)->daddr;
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
74 static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
75 {
76 int ttl = ip_hdr(skb)->ttl;
77 put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
78 }
79
80 static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
81 {
82 put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos);
83 }
84
85 static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
86 {
87 if (IPCB(skb)->opt.optlen == 0)
88 return;
89
90 put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen,
91 ip_hdr(skb) + 1);
92 }
93
94
95 static 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 static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
113 {
114 char *secdata;
115 u32 seclen, secid;
116 int err;
117
118 err = security_socket_getpeersec_dgram(NULL, skb, &secid);
119 if (err)
120 return;
121
122 err = security_secid_to_secctx(secid, &secdata, &seclen);
123 if (err)
124 return;
125
126 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
127 security_release_secctx(secdata, seclen);
128 }
129
130 static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
131 {
132 struct sockaddr_in sin;
133 struct iphdr *iph = ip_hdr(skb);
134 __be16 *ports = (__be16 *)skb_transport_header(skb);
135
136 if (skb_transport_offset(skb) + 4 > skb->len)
137 return;
138
139 /* All current transport protocols have the port numbers in the
140 * first four bytes of the transport header and this function is
141 * written with this assumption in mind.
142 */
143
144 sin.sin_family = AF_INET;
145 sin.sin_addr.s_addr = iph->daddr;
146 sin.sin_port = ports[1];
147 memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
148
149 put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin);
150 }
151
152 void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
153 {
154 struct inet_sock *inet = inet_sk(skb->sk);
155 unsigned flags = inet->cmsg_flags;
156
157 /* Ordered by supposed usage frequency */
158 if (flags & 1)
159 ip_cmsg_recv_pktinfo(msg, skb);
160 if ((flags >>= 1) == 0)
161 return;
162
163 if (flags & 1)
164 ip_cmsg_recv_ttl(msg, skb);
165 if ((flags >>= 1) == 0)
166 return;
167
168 if (flags & 1)
169 ip_cmsg_recv_tos(msg, skb);
170 if ((flags >>= 1) == 0)
171 return;
172
173 if (flags & 1)
174 ip_cmsg_recv_opts(msg, skb);
175 if ((flags >>= 1) == 0)
176 return;
177
178 if (flags & 1)
179 ip_cmsg_recv_retopts(msg, skb);
180 if ((flags >>= 1) == 0)
181 return;
182
183 if (flags & 1)
184 ip_cmsg_recv_security(msg, skb);
185
186 if ((flags >>= 1) == 0)
187 return;
188 if (flags & 1)
189 ip_cmsg_recv_dstaddr(msg, skb);
190
191 }
192 EXPORT_SYMBOL(ip_cmsg_recv);
193
194 int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc)
195 {
196 int err;
197 struct cmsghdr *cmsg;
198
199 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
200 if (!CMSG_OK(msg, cmsg))
201 return -EINVAL;
202 if (cmsg->cmsg_level != SOL_IP)
203 continue;
204 switch (cmsg->cmsg_type) {
205 case IP_RETOPTS:
206 err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
207 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg),
208 err < 40 ? err : 40);
209 if (err)
210 return err;
211 break;
212 case IP_PKTINFO:
213 {
214 struct in_pktinfo *info;
215 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
216 return -EINVAL;
217 info = (struct in_pktinfo *)CMSG_DATA(cmsg);
218 ipc->oif = info->ipi_ifindex;
219 ipc->addr = info->ipi_spec_dst.s_addr;
220 break;
221 }
222 default:
223 return -EINVAL;
224 }
225 }
226 return 0;
227 }
228
229
230 /* Special input handler for packets caught by router alert option.
231 They are selected only by protocol field, and then processed likely
232 local ones; but only if someone wants them! Otherwise, router
233 not running rsvpd will kill RSVP.
234
235 It is user level problem, what it will make with them.
236 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
237 but receiver should be enough clever f.e. to forward mtrace requests,
238 sent to multicast group to reach destination designated router.
239 */
240 struct ip_ra_chain *ip_ra_chain;
241 DEFINE_RWLOCK(ip_ra_lock);
242
243 int ip_ra_control(struct sock *sk, unsigned char on,
244 void (*destructor)(struct sock *))
245 {
246 struct ip_ra_chain *ra, *new_ra, **rap;
247
248 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW)
249 return -EINVAL;
250
251 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
252
253 write_lock_bh(&ip_ra_lock);
254 for (rap = &ip_ra_chain; (ra = *rap) != NULL; rap = &ra->next) {
255 if (ra->sk == sk) {
256 if (on) {
257 write_unlock_bh(&ip_ra_lock);
258 kfree(new_ra);
259 return -EADDRINUSE;
260 }
261 *rap = ra->next;
262 write_unlock_bh(&ip_ra_lock);
263
264 if (ra->destructor)
265 ra->destructor(sk);
266 sock_put(sk);
267 kfree(ra);
268 return 0;
269 }
270 }
271 if (new_ra == NULL) {
272 write_unlock_bh(&ip_ra_lock);
273 return -ENOBUFS;
274 }
275 new_ra->sk = sk;
276 new_ra->destructor = destructor;
277
278 new_ra->next = ra;
279 *rap = new_ra;
280 sock_hold(sk);
281 write_unlock_bh(&ip_ra_lock);
282
283 return 0;
284 }
285
286 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
287 __be16 port, u32 info, u8 *payload)
288 {
289 struct inet_sock *inet = inet_sk(sk);
290 struct sock_exterr_skb *serr;
291
292 if (!inet->recverr)
293 return;
294
295 skb = skb_clone(skb, GFP_ATOMIC);
296 if (!skb)
297 return;
298
299 serr = SKB_EXT_ERR(skb);
300 serr->ee.ee_errno = err;
301 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
302 serr->ee.ee_type = icmp_hdr(skb)->type;
303 serr->ee.ee_code = icmp_hdr(skb)->code;
304 serr->ee.ee_pad = 0;
305 serr->ee.ee_info = info;
306 serr->ee.ee_data = 0;
307 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
308 skb_network_header(skb);
309 serr->port = port;
310
311 if (skb_pull(skb, payload - skb->data) != NULL) {
312 skb_reset_transport_header(skb);
313 if (sock_queue_err_skb(sk, skb) == 0)
314 return;
315 }
316 kfree_skb(skb);
317 }
318
319 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
320 {
321 struct inet_sock *inet = inet_sk(sk);
322 struct sock_exterr_skb *serr;
323 struct iphdr *iph;
324 struct sk_buff *skb;
325
326 if (!inet->recverr)
327 return;
328
329 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
330 if (!skb)
331 return;
332
333 skb_put(skb, sizeof(struct iphdr));
334 skb_reset_network_header(skb);
335 iph = ip_hdr(skb);
336 iph->daddr = daddr;
337
338 serr = SKB_EXT_ERR(skb);
339 serr->ee.ee_errno = err;
340 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
341 serr->ee.ee_type = 0;
342 serr->ee.ee_code = 0;
343 serr->ee.ee_pad = 0;
344 serr->ee.ee_info = info;
345 serr->ee.ee_data = 0;
346 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
347 serr->port = port;
348
349 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
350 skb_reset_transport_header(skb);
351
352 if (sock_queue_err_skb(sk, skb))
353 kfree_skb(skb);
354 }
355
356 /*
357 * Handle MSG_ERRQUEUE
358 */
359 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len)
360 {
361 struct sock_exterr_skb *serr;
362 struct sk_buff *skb, *skb2;
363 struct sockaddr_in *sin;
364 struct {
365 struct sock_extended_err ee;
366 struct sockaddr_in offender;
367 } errhdr;
368 int err;
369 int copied;
370
371 err = -EAGAIN;
372 skb = skb_dequeue(&sk->sk_error_queue);
373 if (skb == NULL)
374 goto out;
375
376 copied = skb->len;
377 if (copied > len) {
378 msg->msg_flags |= MSG_TRUNC;
379 copied = len;
380 }
381 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
382 if (err)
383 goto out_free_skb;
384
385 sock_recv_timestamp(msg, sk, skb);
386
387 serr = SKB_EXT_ERR(skb);
388
389 sin = (struct sockaddr_in *)msg->msg_name;
390 if (sin) {
391 sin->sin_family = AF_INET;
392 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
393 serr->addr_offset);
394 sin->sin_port = serr->port;
395 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
396 }
397
398 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
399 sin = &errhdr.offender;
400 sin->sin_family = AF_UNSPEC;
401 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
402 struct inet_sock *inet = inet_sk(sk);
403
404 sin->sin_family = AF_INET;
405 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
406 sin->sin_port = 0;
407 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
408 if (inet->cmsg_flags)
409 ip_cmsg_recv(msg, skb);
410 }
411
412 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
413
414 /* Now we could try to dump offended packet options */
415
416 msg->msg_flags |= MSG_ERRQUEUE;
417 err = copied;
418
419 /* Reset and regenerate socket error */
420 spin_lock_bh(&sk->sk_error_queue.lock);
421 sk->sk_err = 0;
422 skb2 = skb_peek(&sk->sk_error_queue);
423 if (skb2 != NULL) {
424 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
425 spin_unlock_bh(&sk->sk_error_queue.lock);
426 sk->sk_error_report(sk);
427 } else
428 spin_unlock_bh(&sk->sk_error_queue.lock);
429
430 out_free_skb:
431 kfree_skb(skb);
432 out:
433 return err;
434 }
435
436
437 /*
438 * Socket option code for IP. This is the end of the line after any
439 * TCP,UDP etc options on an IP socket.
440 */
441
442 static int do_ip_setsockopt(struct sock *sk, int level,
443 int optname, char __user *optval, unsigned int optlen)
444 {
445 struct inet_sock *inet = inet_sk(sk);
446 int val = 0, err;
447
448 if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) |
449 (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) |
450 (1<<IP_RETOPTS) | (1<<IP_TOS) |
451 (1<<IP_TTL) | (1<<IP_HDRINCL) |
452 (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) |
453 (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) |
454 (1<<IP_PASSSEC) | (1<<IP_TRANSPARENT))) ||
455 optname == IP_MULTICAST_TTL ||
456 optname == IP_MULTICAST_ALL ||
457 optname == IP_MULTICAST_LOOP ||
458 optname == IP_RECVORIGDSTADDR) {
459 if (optlen >= sizeof(int)) {
460 if (get_user(val, (int __user *) optval))
461 return -EFAULT;
462 } else if (optlen >= sizeof(char)) {
463 unsigned char ucval;
464
465 if (get_user(ucval, (unsigned char __user *) optval))
466 return -EFAULT;
467 val = (int) ucval;
468 }
469 }
470
471 /* If optlen==0, it is equivalent to val == 0 */
472
473 if (ip_mroute_opt(optname))
474 return ip_mroute_setsockopt(sk, optname, optval, optlen);
475
476 err = 0;
477 lock_sock(sk);
478
479 switch (optname) {
480 case IP_OPTIONS:
481 {
482 struct ip_options *opt = NULL;
483 if (optlen > 40)
484 goto e_inval;
485 err = ip_options_get_from_user(sock_net(sk), &opt,
486 optval, optlen);
487 if (err)
488 break;
489 if (inet->is_icsk) {
490 struct inet_connection_sock *icsk = inet_csk(sk);
491 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
492 if (sk->sk_family == PF_INET ||
493 (!((1 << sk->sk_state) &
494 (TCPF_LISTEN | TCPF_CLOSE)) &&
495 inet->inet_daddr != LOOPBACK4_IPV6)) {
496 #endif
497 if (inet->opt)
498 icsk->icsk_ext_hdr_len -= inet->opt->optlen;
499 if (opt)
500 icsk->icsk_ext_hdr_len += opt->optlen;
501 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
502 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
503 }
504 #endif
505 }
506 opt = xchg(&inet->opt, opt);
507 kfree(opt);
508 break;
509 }
510 case IP_PKTINFO:
511 if (val)
512 inet->cmsg_flags |= IP_CMSG_PKTINFO;
513 else
514 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
515 break;
516 case IP_RECVTTL:
517 if (val)
518 inet->cmsg_flags |= IP_CMSG_TTL;
519 else
520 inet->cmsg_flags &= ~IP_CMSG_TTL;
521 break;
522 case IP_RECVTOS:
523 if (val)
524 inet->cmsg_flags |= IP_CMSG_TOS;
525 else
526 inet->cmsg_flags &= ~IP_CMSG_TOS;
527 break;
528 case IP_RECVOPTS:
529 if (val)
530 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
531 else
532 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
533 break;
534 case IP_RETOPTS:
535 if (val)
536 inet->cmsg_flags |= IP_CMSG_RETOPTS;
537 else
538 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
539 break;
540 case IP_PASSSEC:
541 if (val)
542 inet->cmsg_flags |= IP_CMSG_PASSSEC;
543 else
544 inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
545 break;
546 case IP_RECVORIGDSTADDR:
547 if (val)
548 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR;
549 else
550 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR;
551 break;
552 case IP_TOS: /* This sets both TOS and Precedence */
553 if (sk->sk_type == SOCK_STREAM) {
554 val &= ~3;
555 val |= inet->tos & 3;
556 }
557 if (inet->tos != val) {
558 inet->tos = val;
559 sk->sk_priority = rt_tos2priority(val);
560 sk_dst_reset(sk);
561 }
562 break;
563 case IP_TTL:
564 if (optlen < 1)
565 goto e_inval;
566 if (val != -1 && (val < 0 || val > 255))
567 goto e_inval;
568 inet->uc_ttl = val;
569 break;
570 case IP_HDRINCL:
571 if (sk->sk_type != SOCK_RAW) {
572 err = -ENOPROTOOPT;
573 break;
574 }
575 inet->hdrincl = val ? 1 : 0;
576 break;
577 case IP_MTU_DISCOVER:
578 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_PROBE)
579 goto e_inval;
580 inet->pmtudisc = val;
581 break;
582 case IP_RECVERR:
583 inet->recverr = !!val;
584 if (!val)
585 skb_queue_purge(&sk->sk_error_queue);
586 break;
587 case IP_MULTICAST_TTL:
588 if (sk->sk_type == SOCK_STREAM)
589 goto e_inval;
590 if (optlen < 1)
591 goto e_inval;
592 if (val == -1)
593 val = 1;
594 if (val < 0 || val > 255)
595 goto e_inval;
596 inet->mc_ttl = val;
597 break;
598 case IP_MULTICAST_LOOP:
599 if (optlen < 1)
600 goto e_inval;
601 inet->mc_loop = !!val;
602 break;
603 case IP_MULTICAST_IF:
604 {
605 struct ip_mreqn mreq;
606 struct net_device *dev = NULL;
607
608 if (sk->sk_type == SOCK_STREAM)
609 goto e_inval;
610 /*
611 * Check the arguments are allowable
612 */
613
614 if (optlen < sizeof(struct in_addr))
615 goto e_inval;
616
617 err = -EFAULT;
618 if (optlen >= sizeof(struct ip_mreqn)) {
619 if (copy_from_user(&mreq, optval, sizeof(mreq)))
620 break;
621 } else {
622 memset(&mreq, 0, sizeof(mreq));
623 if (optlen >= sizeof(struct in_addr) &&
624 copy_from_user(&mreq.imr_address, optval,
625 sizeof(struct in_addr)))
626 break;
627 }
628
629 if (!mreq.imr_ifindex) {
630 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
631 inet->mc_index = 0;
632 inet->mc_addr = 0;
633 err = 0;
634 break;
635 }
636 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
637 if (dev)
638 mreq.imr_ifindex = dev->ifindex;
639 } else
640 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
641
642
643 err = -EADDRNOTAVAIL;
644 if (!dev)
645 break;
646 dev_put(dev);
647
648 err = -EINVAL;
649 if (sk->sk_bound_dev_if &&
650 mreq.imr_ifindex != sk->sk_bound_dev_if)
651 break;
652
653 inet->mc_index = mreq.imr_ifindex;
654 inet->mc_addr = mreq.imr_address.s_addr;
655 err = 0;
656 break;
657 }
658
659 case IP_ADD_MEMBERSHIP:
660 case IP_DROP_MEMBERSHIP:
661 {
662 struct ip_mreqn mreq;
663
664 err = -EPROTO;
665 if (inet_sk(sk)->is_icsk)
666 break;
667
668 if (optlen < sizeof(struct ip_mreq))
669 goto e_inval;
670 err = -EFAULT;
671 if (optlen >= sizeof(struct ip_mreqn)) {
672 if (copy_from_user(&mreq, optval, sizeof(mreq)))
673 break;
674 } else {
675 memset(&mreq, 0, sizeof(mreq));
676 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq)))
677 break;
678 }
679
680 if (optname == IP_ADD_MEMBERSHIP)
681 err = ip_mc_join_group(sk, &mreq);
682 else
683 err = ip_mc_leave_group(sk, &mreq);
684 break;
685 }
686 case IP_MSFILTER:
687 {
688 struct ip_msfilter *msf;
689
690 if (optlen < IP_MSFILTER_SIZE(0))
691 goto e_inval;
692 if (optlen > sysctl_optmem_max) {
693 err = -ENOBUFS;
694 break;
695 }
696 msf = kmalloc(optlen, GFP_KERNEL);
697 if (!msf) {
698 err = -ENOBUFS;
699 break;
700 }
701 err = -EFAULT;
702 if (copy_from_user(msf, optval, optlen)) {
703 kfree(msf);
704 break;
705 }
706 /* numsrc >= (1G-4) overflow in 32 bits */
707 if (msf->imsf_numsrc >= 0x3ffffffcU ||
708 msf->imsf_numsrc > sysctl_igmp_max_msf) {
709 kfree(msf);
710 err = -ENOBUFS;
711 break;
712 }
713 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
714 kfree(msf);
715 err = -EINVAL;
716 break;
717 }
718 err = ip_mc_msfilter(sk, msf, 0);
719 kfree(msf);
720 break;
721 }
722 case IP_BLOCK_SOURCE:
723 case IP_UNBLOCK_SOURCE:
724 case IP_ADD_SOURCE_MEMBERSHIP:
725 case IP_DROP_SOURCE_MEMBERSHIP:
726 {
727 struct ip_mreq_source mreqs;
728 int omode, add;
729
730 if (optlen != sizeof(struct ip_mreq_source))
731 goto e_inval;
732 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
733 err = -EFAULT;
734 break;
735 }
736 if (optname == IP_BLOCK_SOURCE) {
737 omode = MCAST_EXCLUDE;
738 add = 1;
739 } else if (optname == IP_UNBLOCK_SOURCE) {
740 omode = MCAST_EXCLUDE;
741 add = 0;
742 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
743 struct ip_mreqn mreq;
744
745 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
746 mreq.imr_address.s_addr = mreqs.imr_interface;
747 mreq.imr_ifindex = 0;
748 err = ip_mc_join_group(sk, &mreq);
749 if (err && err != -EADDRINUSE)
750 break;
751 omode = MCAST_INCLUDE;
752 add = 1;
753 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
754 omode = MCAST_INCLUDE;
755 add = 0;
756 }
757 err = ip_mc_source(add, omode, sk, &mreqs, 0);
758 break;
759 }
760 case MCAST_JOIN_GROUP:
761 case MCAST_LEAVE_GROUP:
762 {
763 struct group_req greq;
764 struct sockaddr_in *psin;
765 struct ip_mreqn mreq;
766
767 if (optlen < sizeof(struct group_req))
768 goto e_inval;
769 err = -EFAULT;
770 if (copy_from_user(&greq, optval, sizeof(greq)))
771 break;
772 psin = (struct sockaddr_in *)&greq.gr_group;
773 if (psin->sin_family != AF_INET)
774 goto e_inval;
775 memset(&mreq, 0, sizeof(mreq));
776 mreq.imr_multiaddr = psin->sin_addr;
777 mreq.imr_ifindex = greq.gr_interface;
778
779 if (optname == MCAST_JOIN_GROUP)
780 err = ip_mc_join_group(sk, &mreq);
781 else
782 err = ip_mc_leave_group(sk, &mreq);
783 break;
784 }
785 case MCAST_JOIN_SOURCE_GROUP:
786 case MCAST_LEAVE_SOURCE_GROUP:
787 case MCAST_BLOCK_SOURCE:
788 case MCAST_UNBLOCK_SOURCE:
789 {
790 struct group_source_req greqs;
791 struct ip_mreq_source mreqs;
792 struct sockaddr_in *psin;
793 int omode, add;
794
795 if (optlen != sizeof(struct group_source_req))
796 goto e_inval;
797 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
798 err = -EFAULT;
799 break;
800 }
801 if (greqs.gsr_group.ss_family != AF_INET ||
802 greqs.gsr_source.ss_family != AF_INET) {
803 err = -EADDRNOTAVAIL;
804 break;
805 }
806 psin = (struct sockaddr_in *)&greqs.gsr_group;
807 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
808 psin = (struct sockaddr_in *)&greqs.gsr_source;
809 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
810 mreqs.imr_interface = 0; /* use index for mc_source */
811
812 if (optname == MCAST_BLOCK_SOURCE) {
813 omode = MCAST_EXCLUDE;
814 add = 1;
815 } else if (optname == MCAST_UNBLOCK_SOURCE) {
816 omode = MCAST_EXCLUDE;
817 add = 0;
818 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
819 struct ip_mreqn mreq;
820
821 psin = (struct sockaddr_in *)&greqs.gsr_group;
822 mreq.imr_multiaddr = psin->sin_addr;
823 mreq.imr_address.s_addr = 0;
824 mreq.imr_ifindex = greqs.gsr_interface;
825 err = ip_mc_join_group(sk, &mreq);
826 if (err && err != -EADDRINUSE)
827 break;
828 greqs.gsr_interface = mreq.imr_ifindex;
829 omode = MCAST_INCLUDE;
830 add = 1;
831 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
832 omode = MCAST_INCLUDE;
833 add = 0;
834 }
835 err = ip_mc_source(add, omode, sk, &mreqs,
836 greqs.gsr_interface);
837 break;
838 }
839 case MCAST_MSFILTER:
840 {
841 struct sockaddr_in *psin;
842 struct ip_msfilter *msf = NULL;
843 struct group_filter *gsf = NULL;
844 int msize, i, ifindex;
845
846 if (optlen < GROUP_FILTER_SIZE(0))
847 goto e_inval;
848 if (optlen > sysctl_optmem_max) {
849 err = -ENOBUFS;
850 break;
851 }
852 gsf = kmalloc(optlen, GFP_KERNEL);
853 if (!gsf) {
854 err = -ENOBUFS;
855 break;
856 }
857 err = -EFAULT;
858 if (copy_from_user(gsf, optval, optlen))
859 goto mc_msf_out;
860
861 /* numsrc >= (4G-140)/128 overflow in 32 bits */
862 if (gsf->gf_numsrc >= 0x1ffffff ||
863 gsf->gf_numsrc > sysctl_igmp_max_msf) {
864 err = -ENOBUFS;
865 goto mc_msf_out;
866 }
867 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
868 err = -EINVAL;
869 goto mc_msf_out;
870 }
871 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
872 msf = kmalloc(msize, GFP_KERNEL);
873 if (!msf) {
874 err = -ENOBUFS;
875 goto mc_msf_out;
876 }
877 ifindex = gsf->gf_interface;
878 psin = (struct sockaddr_in *)&gsf->gf_group;
879 if (psin->sin_family != AF_INET) {
880 err = -EADDRNOTAVAIL;
881 goto mc_msf_out;
882 }
883 msf->imsf_multiaddr = psin->sin_addr.s_addr;
884 msf->imsf_interface = 0;
885 msf->imsf_fmode = gsf->gf_fmode;
886 msf->imsf_numsrc = gsf->gf_numsrc;
887 err = -EADDRNOTAVAIL;
888 for (i = 0; i < gsf->gf_numsrc; ++i) {
889 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
890
891 if (psin->sin_family != AF_INET)
892 goto mc_msf_out;
893 msf->imsf_slist[i] = psin->sin_addr.s_addr;
894 }
895 kfree(gsf);
896 gsf = NULL;
897
898 err = ip_mc_msfilter(sk, msf, ifindex);
899 mc_msf_out:
900 kfree(msf);
901 kfree(gsf);
902 break;
903 }
904 case IP_MULTICAST_ALL:
905 if (optlen < 1)
906 goto e_inval;
907 if (val != 0 && val != 1)
908 goto e_inval;
909 inet->mc_all = val;
910 break;
911 case IP_ROUTER_ALERT:
912 err = ip_ra_control(sk, val ? 1 : 0, NULL);
913 break;
914
915 case IP_FREEBIND:
916 if (optlen < 1)
917 goto e_inval;
918 inet->freebind = !!val;
919 break;
920
921 case IP_IPSEC_POLICY:
922 case IP_XFRM_POLICY:
923 err = -EPERM;
924 if (!capable(CAP_NET_ADMIN))
925 break;
926 err = xfrm_user_policy(sk, optname, optval, optlen);
927 break;
928
929 case IP_TRANSPARENT:
930 if (!capable(CAP_NET_ADMIN)) {
931 err = -EPERM;
932 break;
933 }
934 if (optlen < 1)
935 goto e_inval;
936 inet->transparent = !!val;
937 break;
938
939 default:
940 err = -ENOPROTOOPT;
941 break;
942 }
943 release_sock(sk);
944 return err;
945
946 e_inval:
947 release_sock(sk);
948 return -EINVAL;
949 }
950
951 int ip_setsockopt(struct sock *sk, int level,
952 int optname, char __user *optval, unsigned int optlen)
953 {
954 int err;
955
956 if (level != SOL_IP)
957 return -ENOPROTOOPT;
958
959 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
960 #ifdef CONFIG_NETFILTER
961 /* we need to exclude all possible ENOPROTOOPTs except default case */
962 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
963 optname != IP_IPSEC_POLICY &&
964 optname != IP_XFRM_POLICY &&
965 !ip_mroute_opt(optname)) {
966 lock_sock(sk);
967 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
968 release_sock(sk);
969 }
970 #endif
971 return err;
972 }
973 EXPORT_SYMBOL(ip_setsockopt);
974
975 #ifdef CONFIG_COMPAT
976 int compat_ip_setsockopt(struct sock *sk, int level, int optname,
977 char __user *optval, unsigned int optlen)
978 {
979 int err;
980
981 if (level != SOL_IP)
982 return -ENOPROTOOPT;
983
984 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
985 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
986 ip_setsockopt);
987
988 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
989 #ifdef CONFIG_NETFILTER
990 /* we need to exclude all possible ENOPROTOOPTs except default case */
991 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
992 optname != IP_IPSEC_POLICY &&
993 optname != IP_XFRM_POLICY &&
994 !ip_mroute_opt(optname)) {
995 lock_sock(sk);
996 err = compat_nf_setsockopt(sk, PF_INET, optname,
997 optval, optlen);
998 release_sock(sk);
999 }
1000 #endif
1001 return err;
1002 }
1003 EXPORT_SYMBOL(compat_ip_setsockopt);
1004 #endif
1005
1006 /*
1007 * Get the options. Note for future reference. The GET of IP options gets
1008 * the _received_ ones. The set sets the _sent_ ones.
1009 */
1010
1011 static int do_ip_getsockopt(struct sock *sk, int level, int optname,
1012 char __user *optval, int __user *optlen)
1013 {
1014 struct inet_sock *inet = inet_sk(sk);
1015 int val;
1016 int len;
1017
1018 if (level != SOL_IP)
1019 return -EOPNOTSUPP;
1020
1021 if (ip_mroute_opt(optname))
1022 return ip_mroute_getsockopt(sk, optname, optval, optlen);
1023
1024 if (get_user(len, optlen))
1025 return -EFAULT;
1026 if (len < 0)
1027 return -EINVAL;
1028
1029 lock_sock(sk);
1030
1031 switch (optname) {
1032 case IP_OPTIONS:
1033 {
1034 unsigned char optbuf[sizeof(struct ip_options)+40];
1035 struct ip_options * opt = (struct ip_options *)optbuf;
1036 opt->optlen = 0;
1037 if (inet->opt)
1038 memcpy(optbuf, inet->opt,
1039 sizeof(struct ip_options)+
1040 inet->opt->optlen);
1041 release_sock(sk);
1042
1043 if (opt->optlen == 0)
1044 return put_user(0, optlen);
1045
1046 ip_options_undo(opt);
1047
1048 len = min_t(unsigned int, len, opt->optlen);
1049 if (put_user(len, optlen))
1050 return -EFAULT;
1051 if (copy_to_user(optval, opt->__data, len))
1052 return -EFAULT;
1053 return 0;
1054 }
1055 case IP_PKTINFO:
1056 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
1057 break;
1058 case IP_RECVTTL:
1059 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1060 break;
1061 case IP_RECVTOS:
1062 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1063 break;
1064 case IP_RECVOPTS:
1065 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1066 break;
1067 case IP_RETOPTS:
1068 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1069 break;
1070 case IP_PASSSEC:
1071 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1072 break;
1073 case IP_RECVORIGDSTADDR:
1074 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0;
1075 break;
1076 case IP_TOS:
1077 val = inet->tos;
1078 break;
1079 case IP_TTL:
1080 val = (inet->uc_ttl == -1 ?
1081 sysctl_ip_default_ttl :
1082 inet->uc_ttl);
1083 break;
1084 case IP_HDRINCL:
1085 val = inet->hdrincl;
1086 break;
1087 case IP_MTU_DISCOVER:
1088 val = inet->pmtudisc;
1089 break;
1090 case IP_MTU:
1091 {
1092 struct dst_entry *dst;
1093 val = 0;
1094 dst = sk_dst_get(sk);
1095 if (dst) {
1096 val = dst_mtu(dst);
1097 dst_release(dst);
1098 }
1099 if (!val) {
1100 release_sock(sk);
1101 return -ENOTCONN;
1102 }
1103 break;
1104 }
1105 case IP_RECVERR:
1106 val = inet->recverr;
1107 break;
1108 case IP_MULTICAST_TTL:
1109 val = inet->mc_ttl;
1110 break;
1111 case IP_MULTICAST_LOOP:
1112 val = inet->mc_loop;
1113 break;
1114 case IP_MULTICAST_IF:
1115 {
1116 struct in_addr addr;
1117 len = min_t(unsigned int, len, sizeof(struct in_addr));
1118 addr.s_addr = inet->mc_addr;
1119 release_sock(sk);
1120
1121 if (put_user(len, optlen))
1122 return -EFAULT;
1123 if (copy_to_user(optval, &addr, len))
1124 return -EFAULT;
1125 return 0;
1126 }
1127 case IP_MSFILTER:
1128 {
1129 struct ip_msfilter msf;
1130 int err;
1131
1132 if (len < IP_MSFILTER_SIZE(0)) {
1133 release_sock(sk);
1134 return -EINVAL;
1135 }
1136 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1137 release_sock(sk);
1138 return -EFAULT;
1139 }
1140 err = ip_mc_msfget(sk, &msf,
1141 (struct ip_msfilter __user *)optval, optlen);
1142 release_sock(sk);
1143 return err;
1144 }
1145 case MCAST_MSFILTER:
1146 {
1147 struct group_filter gsf;
1148 int err;
1149
1150 if (len < GROUP_FILTER_SIZE(0)) {
1151 release_sock(sk);
1152 return -EINVAL;
1153 }
1154 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1155 release_sock(sk);
1156 return -EFAULT;
1157 }
1158 err = ip_mc_gsfget(sk, &gsf,
1159 (struct group_filter __user *)optval,
1160 optlen);
1161 release_sock(sk);
1162 return err;
1163 }
1164 case IP_MULTICAST_ALL:
1165 val = inet->mc_all;
1166 break;
1167 case IP_PKTOPTIONS:
1168 {
1169 struct msghdr msg;
1170
1171 release_sock(sk);
1172
1173 if (sk->sk_type != SOCK_STREAM)
1174 return -ENOPROTOOPT;
1175
1176 msg.msg_control = optval;
1177 msg.msg_controllen = len;
1178 msg.msg_flags = 0;
1179
1180 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1181 struct in_pktinfo info;
1182
1183 info.ipi_addr.s_addr = inet->inet_rcv_saddr;
1184 info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr;
1185 info.ipi_ifindex = inet->mc_index;
1186 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1187 }
1188 if (inet->cmsg_flags & IP_CMSG_TTL) {
1189 int hlim = inet->mc_ttl;
1190 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1191 }
1192 len -= msg.msg_controllen;
1193 return put_user(len, optlen);
1194 }
1195 case IP_FREEBIND:
1196 val = inet->freebind;
1197 break;
1198 case IP_TRANSPARENT:
1199 val = inet->transparent;
1200 break;
1201 default:
1202 release_sock(sk);
1203 return -ENOPROTOOPT;
1204 }
1205 release_sock(sk);
1206
1207 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) {
1208 unsigned char ucval = (unsigned char)val;
1209 len = 1;
1210 if (put_user(len, optlen))
1211 return -EFAULT;
1212 if (copy_to_user(optval, &ucval, 1))
1213 return -EFAULT;
1214 } else {
1215 len = min_t(unsigned int, sizeof(int), len);
1216 if (put_user(len, optlen))
1217 return -EFAULT;
1218 if (copy_to_user(optval, &val, len))
1219 return -EFAULT;
1220 }
1221 return 0;
1222 }
1223
1224 int ip_getsockopt(struct sock *sk, int level,
1225 int optname, char __user *optval, int __user *optlen)
1226 {
1227 int err;
1228
1229 err = do_ip_getsockopt(sk, level, optname, optval, optlen);
1230 #ifdef CONFIG_NETFILTER
1231 /* we need to exclude all possible ENOPROTOOPTs except default case */
1232 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1233 !ip_mroute_opt(optname)) {
1234 int len;
1235
1236 if (get_user(len, optlen))
1237 return -EFAULT;
1238
1239 lock_sock(sk);
1240 err = nf_getsockopt(sk, PF_INET, optname, optval,
1241 &len);
1242 release_sock(sk);
1243 if (err >= 0)
1244 err = put_user(len, optlen);
1245 return err;
1246 }
1247 #endif
1248 return err;
1249 }
1250 EXPORT_SYMBOL(ip_getsockopt);
1251
1252 #ifdef CONFIG_COMPAT
1253 int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1254 char __user *optval, int __user *optlen)
1255 {
1256 int err;
1257
1258 if (optname == MCAST_MSFILTER)
1259 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1260 ip_getsockopt);
1261
1262 err = do_ip_getsockopt(sk, level, optname, optval, optlen);
1263
1264 #ifdef CONFIG_NETFILTER
1265 /* we need to exclude all possible ENOPROTOOPTs except default case */
1266 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1267 !ip_mroute_opt(optname)) {
1268 int len;
1269
1270 if (get_user(len, optlen))
1271 return -EFAULT;
1272
1273 lock_sock(sk);
1274 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
1275 release_sock(sk);
1276 if (err >= 0)
1277 err = put_user(len, optlen);
1278 return err;
1279 }
1280 #endif
1281 return err;
1282 }
1283 EXPORT_SYMBOL(compat_ip_getsockopt);
1284 #endif
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