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relay: prevent integer overflow in relay_open()
[linux-2.6.git] / net / ipv4 / ip_sockglue.c
blob8aa87c19fa008f00adbcf8e0fa1b4411d119288b
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 <linux/slab.h>
27 #include <net/sock.h>
28 #include <net/ip.h>
29 #include <net/icmp.h>
30 #include <net/tcp_states.h>
31 #include <linux/udp.h>
32 #include <linux/igmp.h>
33 #include <linux/netfilter.h>
34 #include <linux/route.h>
35 #include <linux/mroute.h>
36 #include <net/inet_ecn.h>
37 #include <net/route.h>
38 #include <net/xfrm.h>
39 #include <net/compat.h>
40 #if IS_ENABLED(CONFIG_IPV6)
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
52 #define IP_CMSG_PASSSEC 32
53 #define IP_CMSG_ORIGDSTADDR 64
54
55 /*
56 * SOL_IP control messages.
57 */
58 #define PKTINFO_SKB_CB(__skb) ((struct in_pktinfo *)((__skb)->cb))
59
60 static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
61 {
62 struct in_pktinfo info = *PKTINFO_SKB_CB(skb);
63
64 info.ipi_addr.s_addr = ip_hdr(skb)->daddr;
65
66 put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
67 }
68
69 static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
70 {
71 int ttl = ip_hdr(skb)->ttl;
72 put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
73 }
74
75 static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
76 {
77 put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos);
78 }
79
80 static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
81 {
82 if (IPCB(skb)->opt.optlen == 0)
83 return;
84
85 put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen,
86 ip_hdr(skb) + 1);
87 }
88
89
90 static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb)
91 {
92 unsigned char optbuf[sizeof(struct ip_options) + 40];
93 struct ip_options * opt = (struct ip_options *)optbuf;
94
95 if (IPCB(skb)->opt.optlen == 0)
96 return;
97
98 if (ip_options_echo(opt, skb)) {
99 msg->msg_flags |= MSG_CTRUNC;
100 return;
101 }
102 ip_options_undo(opt);
103
104 put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data);
105 }
106
107 static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
108 {
109 char *secdata;
110 u32 seclen, secid;
111 int err;
112
113 err = security_socket_getpeersec_dgram(NULL, skb, &secid);
114 if (err)
115 return;
116
117 err = security_secid_to_secctx(secid, &secdata, &seclen);
118 if (err)
119 return;
120
121 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
122 security_release_secctx(secdata, seclen);
123 }
124
125 static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
126 {
127 struct sockaddr_in sin;
128 const struct iphdr *iph = ip_hdr(skb);
129 __be16 *ports = (__be16 *)skb_transport_header(skb);
130
131 if (skb_transport_offset(skb) + 4 > skb->len)
132 return;
133
134 /* All current transport protocols have the port numbers in the
135 * first four bytes of the transport header and this function is
136 * written with this assumption in mind.
137 */
138
139 sin.sin_family = AF_INET;
140 sin.sin_addr.s_addr = iph->daddr;
141 sin.sin_port = ports[1];
142 memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
143
144 put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin);
145 }
146
147 void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
148 {
149 struct inet_sock *inet = inet_sk(skb->sk);
150 unsigned flags = inet->cmsg_flags;
151
152 /* Ordered by supposed usage frequency */
153 if (flags & 1)
154 ip_cmsg_recv_pktinfo(msg, skb);
155 if ((flags >>= 1) == 0)
156 return;
157
158 if (flags & 1)
159 ip_cmsg_recv_ttl(msg, skb);
160 if ((flags >>= 1) == 0)
161 return;
162
163 if (flags & 1)
164 ip_cmsg_recv_tos(msg, skb);
165 if ((flags >>= 1) == 0)
166 return;
167
168 if (flags & 1)
169 ip_cmsg_recv_opts(msg, skb);
170 if ((flags >>= 1) == 0)
171 return;
172
173 if (flags & 1)
174 ip_cmsg_recv_retopts(msg, skb);
175 if ((flags >>= 1) == 0)
176 return;
177
178 if (flags & 1)
179 ip_cmsg_recv_security(msg, skb);
180
181 if ((flags >>= 1) == 0)
182 return;
183 if (flags & 1)
184 ip_cmsg_recv_dstaddr(msg, skb);
185
186 }
187 EXPORT_SYMBOL(ip_cmsg_recv);
188
189 int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc)
190 {
191 int err;
192 struct cmsghdr *cmsg;
193
194 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
195 if (!CMSG_OK(msg, cmsg))
196 return -EINVAL;
197 if (cmsg->cmsg_level != SOL_IP)
198 continue;
199 switch (cmsg->cmsg_type) {
200 case IP_RETOPTS:
201 err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
202 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg),
203 err < 40 ? err : 40);
204 if (err)
205 return err;
206 break;
207 case IP_PKTINFO:
208 {
209 struct in_pktinfo *info;
210 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
211 return -EINVAL;
212 info = (struct in_pktinfo *)CMSG_DATA(cmsg);
213 ipc->oif = info->ipi_ifindex;
214 ipc->addr = info->ipi_spec_dst.s_addr;
215 break;
216 }
217 default:
218 return -EINVAL;
219 }
220 }
221 return 0;
222 }
223
224
225 /* Special input handler for packets caught by router alert option.
226 They are selected only by protocol field, and then processed likely
227 local ones; but only if someone wants them! Otherwise, router
228 not running rsvpd will kill RSVP.
229
230 It is user level problem, what it will make with them.
231 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
232 but receiver should be enough clever f.e. to forward mtrace requests,
233 sent to multicast group to reach destination designated router.
234 */
235 struct ip_ra_chain __rcu *ip_ra_chain;
236 static DEFINE_SPINLOCK(ip_ra_lock);
237
238
239 static void ip_ra_destroy_rcu(struct rcu_head *head)
240 {
241 struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu);
242
243 sock_put(ra->saved_sk);
244 kfree(ra);
245 }
246
247 int ip_ra_control(struct sock *sk, unsigned char on,
248 void (*destructor)(struct sock *))
249 {
250 struct ip_ra_chain *ra, *new_ra;
251 struct ip_ra_chain __rcu **rap;
252
253 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW)
254 return -EINVAL;
255
256 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
257
258 spin_lock_bh(&ip_ra_lock);
259 for (rap = &ip_ra_chain;
260 (ra = rcu_dereference_protected(*rap,
261 lockdep_is_held(&ip_ra_lock))) != NULL;
262 rap = &ra->next) {
263 if (ra->sk == sk) {
264 if (on) {
265 spin_unlock_bh(&ip_ra_lock);
266 kfree(new_ra);
267 return -EADDRINUSE;
268 }
269 /* dont let ip_call_ra_chain() use sk again */
270 ra->sk = NULL;
271 rcu_assign_pointer(*rap, ra->next);
272 spin_unlock_bh(&ip_ra_lock);
273
274 if (ra->destructor)
275 ra->destructor(sk);
276 /*
277 * Delay sock_put(sk) and kfree(ra) after one rcu grace
278 * period. This guarantee ip_call_ra_chain() dont need
279 * to mess with socket refcounts.
280 */
281 ra->saved_sk = sk;
282 call_rcu(&ra->rcu, ip_ra_destroy_rcu);
283 return 0;
284 }
285 }
286 if (new_ra == NULL) {
287 spin_unlock_bh(&ip_ra_lock);
288 return -ENOBUFS;
289 }
290 new_ra->sk = sk;
291 new_ra->destructor = destructor;
292
293 new_ra->next = ra;
294 rcu_assign_pointer(*rap, new_ra);
295 sock_hold(sk);
296 spin_unlock_bh(&ip_ra_lock);
297
298 return 0;
299 }
300
301 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
302 __be16 port, u32 info, u8 *payload)
303 {
304 struct sock_exterr_skb *serr;
305
306 skb = skb_clone(skb, GFP_ATOMIC);
307 if (!skb)
308 return;
309
310 serr = SKB_EXT_ERR(skb);
311 serr->ee.ee_errno = err;
312 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
313 serr->ee.ee_type = icmp_hdr(skb)->type;
314 serr->ee.ee_code = icmp_hdr(skb)->code;
315 serr->ee.ee_pad = 0;
316 serr->ee.ee_info = info;
317 serr->ee.ee_data = 0;
318 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
319 skb_network_header(skb);
320 serr->port = port;
321
322 if (skb_pull(skb, payload - skb->data) != NULL) {
323 skb_reset_transport_header(skb);
324 if (sock_queue_err_skb(sk, skb) == 0)
325 return;
326 }
327 kfree_skb(skb);
328 }
329
330 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
331 {
332 struct inet_sock *inet = inet_sk(sk);
333 struct sock_exterr_skb *serr;
334 struct iphdr *iph;
335 struct sk_buff *skb;
336
337 if (!inet->recverr)
338 return;
339
340 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
341 if (!skb)
342 return;
343
344 skb_put(skb, sizeof(struct iphdr));
345 skb_reset_network_header(skb);
346 iph = ip_hdr(skb);
347 iph->daddr = daddr;
348
349 serr = SKB_EXT_ERR(skb);
350 serr->ee.ee_errno = err;
351 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
352 serr->ee.ee_type = 0;
353 serr->ee.ee_code = 0;
354 serr->ee.ee_pad = 0;
355 serr->ee.ee_info = info;
356 serr->ee.ee_data = 0;
357 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
358 serr->port = port;
359
360 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
361 skb_reset_transport_header(skb);
362
363 if (sock_queue_err_skb(sk, skb))
364 kfree_skb(skb);
365 }
366
367 /*
368 * Handle MSG_ERRQUEUE
369 */
370 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len)
371 {
372 struct sock_exterr_skb *serr;
373 struct sk_buff *skb, *skb2;
374 struct sockaddr_in *sin;
375 struct {
376 struct sock_extended_err ee;
377 struct sockaddr_in offender;
378 } errhdr;
379 int err;
380 int copied;
381
382 err = -EAGAIN;
383 skb = skb_dequeue(&sk->sk_error_queue);
384 if (skb == NULL)
385 goto out;
386
387 copied = skb->len;
388 if (copied > len) {
389 msg->msg_flags |= MSG_TRUNC;
390 copied = len;
391 }
392 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
393 if (err)
394 goto out_free_skb;
395
396 sock_recv_timestamp(msg, sk, skb);
397
398 serr = SKB_EXT_ERR(skb);
399
400 sin = (struct sockaddr_in *)msg->msg_name;
401 if (sin) {
402 sin->sin_family = AF_INET;
403 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
404 serr->addr_offset);
405 sin->sin_port = serr->port;
406 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
407 }
408
409 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
410 sin = &errhdr.offender;
411 sin->sin_family = AF_UNSPEC;
412 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
413 struct inet_sock *inet = inet_sk(sk);
414
415 sin->sin_family = AF_INET;
416 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
417 sin->sin_port = 0;
418 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
419 if (inet->cmsg_flags)
420 ip_cmsg_recv(msg, skb);
421 }
422
423 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
424
425 /* Now we could try to dump offended packet options */
426
427 msg->msg_flags |= MSG_ERRQUEUE;
428 err = copied;
429
430 /* Reset and regenerate socket error */
431 spin_lock_bh(&sk->sk_error_queue.lock);
432 sk->sk_err = 0;
433 skb2 = skb_peek(&sk->sk_error_queue);
434 if (skb2 != NULL) {
435 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
436 spin_unlock_bh(&sk->sk_error_queue.lock);
437 sk->sk_error_report(sk);
438 } else
439 spin_unlock_bh(&sk->sk_error_queue.lock);
440
441 out_free_skb:
442 kfree_skb(skb);
443 out:
444 return err;
445 }
446
447
448 static void opt_kfree_rcu(struct rcu_head *head)
449 {
450 kfree(container_of(head, struct ip_options_rcu, rcu));
451 }
452
453 /*
454 * Socket option code for IP. This is the end of the line after any
455 * TCP,UDP etc options on an IP socket.
456 */
457
458 static int do_ip_setsockopt(struct sock *sk, int level,
459 int optname, char __user *optval, unsigned int optlen)
460 {
461 struct inet_sock *inet = inet_sk(sk);
462 int val = 0, err;
463
464 if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) |
465 (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) |
466 (1<<IP_RETOPTS) | (1<<IP_TOS) |
467 (1<<IP_TTL) | (1<<IP_HDRINCL) |
468 (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) |
469 (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) |
470 (1<<IP_PASSSEC) | (1<<IP_TRANSPARENT) |
471 (1<<IP_MINTTL) | (1<<IP_NODEFRAG))) ||
472 optname == IP_MULTICAST_TTL ||
473 optname == IP_MULTICAST_ALL ||
474 optname == IP_MULTICAST_LOOP ||
475 optname == IP_RECVORIGDSTADDR) {
476 if (optlen >= sizeof(int)) {
477 if (get_user(val, (int __user *) optval))
478 return -EFAULT;
479 } else if (optlen >= sizeof(char)) {
480 unsigned char ucval;
481
482 if (get_user(ucval, (unsigned char __user *) optval))
483 return -EFAULT;
484 val = (int) ucval;
485 }
486 }
487
488 /* If optlen==0, it is equivalent to val == 0 */
489
490 if (ip_mroute_opt(optname))
491 return ip_mroute_setsockopt(sk, optname, optval, optlen);
492
493 err = 0;
494 lock_sock(sk);
495
496 switch (optname) {
497 case IP_OPTIONS:
498 {
499 struct ip_options_rcu *old, *opt = NULL;
500
501 if (optlen > 40)
502 goto e_inval;
503 err = ip_options_get_from_user(sock_net(sk), &opt,
504 optval, optlen);
505 if (err)
506 break;
507 old = rcu_dereference_protected(inet->inet_opt,
508 sock_owned_by_user(sk));
509 if (inet->is_icsk) {
510 struct inet_connection_sock *icsk = inet_csk(sk);
511 #if IS_ENABLED(CONFIG_IPV6)
512 if (sk->sk_family == PF_INET ||
513 (!((1 << sk->sk_state) &
514 (TCPF_LISTEN | TCPF_CLOSE)) &&
515 inet->inet_daddr != LOOPBACK4_IPV6)) {
516 #endif
517 if (old)
518 icsk->icsk_ext_hdr_len -= old->opt.optlen;
519 if (opt)
520 icsk->icsk_ext_hdr_len += opt->opt.optlen;
521 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
522 #if IS_ENABLED(CONFIG_IPV6)
523 }
524 #endif
525 }
526 rcu_assign_pointer(inet->inet_opt, opt);
527 if (old)
528 call_rcu(&old->rcu, opt_kfree_rcu);
529 break;
530 }
531 case IP_PKTINFO:
532 if (val)
533 inet->cmsg_flags |= IP_CMSG_PKTINFO;
534 else
535 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
536 break;
537 case IP_RECVTTL:
538 if (val)
539 inet->cmsg_flags |= IP_CMSG_TTL;
540 else
541 inet->cmsg_flags &= ~IP_CMSG_TTL;
542 break;
543 case IP_RECVTOS:
544 if (val)
545 inet->cmsg_flags |= IP_CMSG_TOS;
546 else
547 inet->cmsg_flags &= ~IP_CMSG_TOS;
548 break;
549 case IP_RECVOPTS:
550 if (val)
551 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
552 else
553 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
554 break;
555 case IP_RETOPTS:
556 if (val)
557 inet->cmsg_flags |= IP_CMSG_RETOPTS;
558 else
559 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
560 break;
561 case IP_PASSSEC:
562 if (val)
563 inet->cmsg_flags |= IP_CMSG_PASSSEC;
564 else
565 inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
566 break;
567 case IP_RECVORIGDSTADDR:
568 if (val)
569 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR;
570 else
571 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR;
572 break;
573 case IP_TOS: /* This sets both TOS and Precedence */
574 if (sk->sk_type == SOCK_STREAM) {
575 val &= ~INET_ECN_MASK;
576 val |= inet->tos & INET_ECN_MASK;
577 }
578 if (inet->tos != val) {
579 inet->tos = val;
580 sk->sk_priority = rt_tos2priority(val);
581 sk_dst_reset(sk);
582 }
583 break;
584 case IP_TTL:
585 if (optlen < 1)
586 goto e_inval;
587 if (val != -1 && (val < 0 || val > 255))
588 goto e_inval;
589 inet->uc_ttl = val;
590 break;
591 case IP_HDRINCL:
592 if (sk->sk_type != SOCK_RAW) {
593 err = -ENOPROTOOPT;
594 break;
595 }
596 inet->hdrincl = val ? 1 : 0;
597 break;
598 case IP_NODEFRAG:
599 if (sk->sk_type != SOCK_RAW) {
600 err = -ENOPROTOOPT;
601 break;
602 }
603 inet->nodefrag = val ? 1 : 0;
604 break;
605 case IP_MTU_DISCOVER:
606 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_PROBE)
607 goto e_inval;
608 inet->pmtudisc = val;
609 break;
610 case IP_RECVERR:
611 inet->recverr = !!val;
612 if (!val)
613 skb_queue_purge(&sk->sk_error_queue);
614 break;
615 case IP_MULTICAST_TTL:
616 if (sk->sk_type == SOCK_STREAM)
617 goto e_inval;
618 if (optlen < 1)
619 goto e_inval;
620 if (val == -1)
621 val = 1;
622 if (val < 0 || val > 255)
623 goto e_inval;
624 inet->mc_ttl = val;
625 break;
626 case IP_MULTICAST_LOOP:
627 if (optlen < 1)
628 goto e_inval;
629 inet->mc_loop = !!val;
630 break;
631 case IP_MULTICAST_IF:
632 {
633 struct ip_mreqn mreq;
634 struct net_device *dev = NULL;
635
636 if (sk->sk_type == SOCK_STREAM)
637 goto e_inval;
638 /*
639 * Check the arguments are allowable
640 */
641
642 if (optlen < sizeof(struct in_addr))
643 goto e_inval;
644
645 err = -EFAULT;
646 if (optlen >= sizeof(struct ip_mreqn)) {
647 if (copy_from_user(&mreq, optval, sizeof(mreq)))
648 break;
649 } else {
650 memset(&mreq, 0, sizeof(mreq));
651 if (optlen >= sizeof(struct in_addr) &&
652 copy_from_user(&mreq.imr_address, optval,
653 sizeof(struct in_addr)))
654 break;
655 }
656
657 if (!mreq.imr_ifindex) {
658 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
659 inet->mc_index = 0;
660 inet->mc_addr = 0;
661 err = 0;
662 break;
663 }
664 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
665 if (dev)
666 mreq.imr_ifindex = dev->ifindex;
667 } else
668 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
669
670
671 err = -EADDRNOTAVAIL;
672 if (!dev)
673 break;
674 dev_put(dev);
675
676 err = -EINVAL;
677 if (sk->sk_bound_dev_if &&
678 mreq.imr_ifindex != sk->sk_bound_dev_if)
679 break;
680
681 inet->mc_index = mreq.imr_ifindex;
682 inet->mc_addr = mreq.imr_address.s_addr;
683 err = 0;
684 break;
685 }
686
687 case IP_ADD_MEMBERSHIP:
688 case IP_DROP_MEMBERSHIP:
689 {
690 struct ip_mreqn mreq;
691
692 err = -EPROTO;
693 if (inet_sk(sk)->is_icsk)
694 break;
695
696 if (optlen < sizeof(struct ip_mreq))
697 goto e_inval;
698 err = -EFAULT;
699 if (optlen >= sizeof(struct ip_mreqn)) {
700 if (copy_from_user(&mreq, optval, sizeof(mreq)))
701 break;
702 } else {
703 memset(&mreq, 0, sizeof(mreq));
704 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq)))
705 break;
706 }
707
708 if (optname == IP_ADD_MEMBERSHIP)
709 err = ip_mc_join_group(sk, &mreq);
710 else
711 err = ip_mc_leave_group(sk, &mreq);
712 break;
713 }
714 case IP_MSFILTER:
715 {
716 struct ip_msfilter *msf;
717
718 if (optlen < IP_MSFILTER_SIZE(0))
719 goto e_inval;
720 if (optlen > sysctl_optmem_max) {
721 err = -ENOBUFS;
722 break;
723 }
724 msf = kmalloc(optlen, GFP_KERNEL);
725 if (!msf) {
726 err = -ENOBUFS;
727 break;
728 }
729 err = -EFAULT;
730 if (copy_from_user(msf, optval, optlen)) {
731 kfree(msf);
732 break;
733 }
734 /* numsrc >= (1G-4) overflow in 32 bits */
735 if (msf->imsf_numsrc >= 0x3ffffffcU ||
736 msf->imsf_numsrc > sysctl_igmp_max_msf) {
737 kfree(msf);
738 err = -ENOBUFS;
739 break;
740 }
741 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
742 kfree(msf);
743 err = -EINVAL;
744 break;
745 }
746 err = ip_mc_msfilter(sk, msf, 0);
747 kfree(msf);
748 break;
749 }
750 case IP_BLOCK_SOURCE:
751 case IP_UNBLOCK_SOURCE:
752 case IP_ADD_SOURCE_MEMBERSHIP:
753 case IP_DROP_SOURCE_MEMBERSHIP:
754 {
755 struct ip_mreq_source mreqs;
756 int omode, add;
757
758 if (optlen != sizeof(struct ip_mreq_source))
759 goto e_inval;
760 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
761 err = -EFAULT;
762 break;
763 }
764 if (optname == IP_BLOCK_SOURCE) {
765 omode = MCAST_EXCLUDE;
766 add = 1;
767 } else if (optname == IP_UNBLOCK_SOURCE) {
768 omode = MCAST_EXCLUDE;
769 add = 0;
770 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
771 struct ip_mreqn mreq;
772
773 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
774 mreq.imr_address.s_addr = mreqs.imr_interface;
775 mreq.imr_ifindex = 0;
776 err = ip_mc_join_group(sk, &mreq);
777 if (err && err != -EADDRINUSE)
778 break;
779 omode = MCAST_INCLUDE;
780 add = 1;
781 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
782 omode = MCAST_INCLUDE;
783 add = 0;
784 }
785 err = ip_mc_source(add, omode, sk, &mreqs, 0);
786 break;
787 }
788 case MCAST_JOIN_GROUP:
789 case MCAST_LEAVE_GROUP:
790 {
791 struct group_req greq;
792 struct sockaddr_in *psin;
793 struct ip_mreqn mreq;
794
795 if (optlen < sizeof(struct group_req))
796 goto e_inval;
797 err = -EFAULT;
798 if (copy_from_user(&greq, optval, sizeof(greq)))
799 break;
800 psin = (struct sockaddr_in *)&greq.gr_group;
801 if (psin->sin_family != AF_INET)
802 goto e_inval;
803 memset(&mreq, 0, sizeof(mreq));
804 mreq.imr_multiaddr = psin->sin_addr;
805 mreq.imr_ifindex = greq.gr_interface;
806
807 if (optname == MCAST_JOIN_GROUP)
808 err = ip_mc_join_group(sk, &mreq);
809 else
810 err = ip_mc_leave_group(sk, &mreq);
811 break;
812 }
813 case MCAST_JOIN_SOURCE_GROUP:
814 case MCAST_LEAVE_SOURCE_GROUP:
815 case MCAST_BLOCK_SOURCE:
816 case MCAST_UNBLOCK_SOURCE:
817 {
818 struct group_source_req greqs;
819 struct ip_mreq_source mreqs;
820 struct sockaddr_in *psin;
821 int omode, add;
822
823 if (optlen != sizeof(struct group_source_req))
824 goto e_inval;
825 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
826 err = -EFAULT;
827 break;
828 }
829 if (greqs.gsr_group.ss_family != AF_INET ||
830 greqs.gsr_source.ss_family != AF_INET) {
831 err = -EADDRNOTAVAIL;
832 break;
833 }
834 psin = (struct sockaddr_in *)&greqs.gsr_group;
835 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
836 psin = (struct sockaddr_in *)&greqs.gsr_source;
837 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
838 mreqs.imr_interface = 0; /* use index for mc_source */
839
840 if (optname == MCAST_BLOCK_SOURCE) {
841 omode = MCAST_EXCLUDE;
842 add = 1;
843 } else if (optname == MCAST_UNBLOCK_SOURCE) {
844 omode = MCAST_EXCLUDE;
845 add = 0;
846 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
847 struct ip_mreqn mreq;
848
849 psin = (struct sockaddr_in *)&greqs.gsr_group;
850 mreq.imr_multiaddr = psin->sin_addr;
851 mreq.imr_address.s_addr = 0;
852 mreq.imr_ifindex = greqs.gsr_interface;
853 err = ip_mc_join_group(sk, &mreq);
854 if (err && err != -EADDRINUSE)
855 break;
856 greqs.gsr_interface = mreq.imr_ifindex;
857 omode = MCAST_INCLUDE;
858 add = 1;
859 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
860 omode = MCAST_INCLUDE;
861 add = 0;
862 }
863 err = ip_mc_source(add, omode, sk, &mreqs,
864 greqs.gsr_interface);
865 break;
866 }
867 case MCAST_MSFILTER:
868 {
869 struct sockaddr_in *psin;
870 struct ip_msfilter *msf = NULL;
871 struct group_filter *gsf = NULL;
872 int msize, i, ifindex;
873
874 if (optlen < GROUP_FILTER_SIZE(0))
875 goto e_inval;
876 if (optlen > sysctl_optmem_max) {
877 err = -ENOBUFS;
878 break;
879 }
880 gsf = kmalloc(optlen, GFP_KERNEL);
881 if (!gsf) {
882 err = -ENOBUFS;
883 break;
884 }
885 err = -EFAULT;
886 if (copy_from_user(gsf, optval, optlen))
887 goto mc_msf_out;
888
889 /* numsrc >= (4G-140)/128 overflow in 32 bits */
890 if (gsf->gf_numsrc >= 0x1ffffff ||
891 gsf->gf_numsrc > sysctl_igmp_max_msf) {
892 err = -ENOBUFS;
893 goto mc_msf_out;
894 }
895 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
896 err = -EINVAL;
897 goto mc_msf_out;
898 }
899 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
900 msf = kmalloc(msize, GFP_KERNEL);
901 if (!msf) {
902 err = -ENOBUFS;
903 goto mc_msf_out;
904 }
905 ifindex = gsf->gf_interface;
906 psin = (struct sockaddr_in *)&gsf->gf_group;
907 if (psin->sin_family != AF_INET) {
908 err = -EADDRNOTAVAIL;
909 goto mc_msf_out;
910 }
911 msf->imsf_multiaddr = psin->sin_addr.s_addr;
912 msf->imsf_interface = 0;
913 msf->imsf_fmode = gsf->gf_fmode;
914 msf->imsf_numsrc = gsf->gf_numsrc;
915 err = -EADDRNOTAVAIL;
916 for (i = 0; i < gsf->gf_numsrc; ++i) {
917 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
918
919 if (psin->sin_family != AF_INET)
920 goto mc_msf_out;
921 msf->imsf_slist[i] = psin->sin_addr.s_addr;
922 }
923 kfree(gsf);
924 gsf = NULL;
925
926 err = ip_mc_msfilter(sk, msf, ifindex);
927 mc_msf_out:
928 kfree(msf);
929 kfree(gsf);
930 break;
931 }
932 case IP_MULTICAST_ALL:
933 if (optlen < 1)
934 goto e_inval;
935 if (val != 0 && val != 1)
936 goto e_inval;
937 inet->mc_all = val;
938 break;
939 case IP_ROUTER_ALERT:
940 err = ip_ra_control(sk, val ? 1 : 0, NULL);
941 break;
942
943 case IP_FREEBIND:
944 if (optlen < 1)
945 goto e_inval;
946 inet->freebind = !!val;
947 break;
948
949 case IP_IPSEC_POLICY:
950 case IP_XFRM_POLICY:
951 err = -EPERM;
952 if (!capable(CAP_NET_ADMIN))
953 break;
954 err = xfrm_user_policy(sk, optname, optval, optlen);
955 break;
956
957 case IP_TRANSPARENT:
958 if (!!val && !capable(CAP_NET_RAW) && !capable(CAP_NET_ADMIN)) {
959 err = -EPERM;
960 break;
961 }
962 if (optlen < 1)
963 goto e_inval;
964 inet->transparent = !!val;
965 break;
966
967 case IP_MINTTL:
968 if (optlen < 1)
969 goto e_inval;
970 if (val < 0 || val > 255)
971 goto e_inval;
972 inet->min_ttl = val;
973 break;
974
975 default:
976 err = -ENOPROTOOPT;
977 break;
978 }
979 release_sock(sk);
980 return err;
981
982 e_inval:
983 release_sock(sk);
984 return -EINVAL;
985 }
986
987 /**
988 * ipv4_pktinfo_prepare - transfert some info from rtable to skb
989 * @sk: socket
990 * @skb: buffer
991 *
992 * To support IP_CMSG_PKTINFO option, we store rt_iif and rt_spec_dst
993 * in skb->cb[] before dst drop.
994 * This way, receiver doesnt make cache line misses to read rtable.
995 */
996 void ipv4_pktinfo_prepare(struct sk_buff *skb)
997 {
998 struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb);
999 const struct rtable *rt = skb_rtable(skb);
1000
1001 if (rt) {
1002 pktinfo->ipi_ifindex = rt->rt_iif;
1003 pktinfo->ipi_spec_dst.s_addr = rt->rt_spec_dst;
1004 } else {
1005 pktinfo->ipi_ifindex = 0;
1006 pktinfo->ipi_spec_dst.s_addr = 0;
1007 }
1008 skb_dst_drop(skb);
1009 }
1010
1011 int ip_setsockopt(struct sock *sk, int level,
1012 int optname, char __user *optval, unsigned int optlen)
1013 {
1014 int err;
1015
1016 if (level != SOL_IP)
1017 return -ENOPROTOOPT;
1018
1019 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1020 #ifdef CONFIG_NETFILTER
1021 /* we need to exclude all possible ENOPROTOOPTs except default case */
1022 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
1023 optname != IP_IPSEC_POLICY &&
1024 optname != IP_XFRM_POLICY &&
1025 !ip_mroute_opt(optname)) {
1026 lock_sock(sk);
1027 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
1028 release_sock(sk);
1029 }
1030 #endif
1031 return err;
1032 }
1033 EXPORT_SYMBOL(ip_setsockopt);
1034
1035 #ifdef CONFIG_COMPAT
1036 int compat_ip_setsockopt(struct sock *sk, int level, int optname,
1037 char __user *optval, unsigned int optlen)
1038 {
1039 int err;
1040
1041 if (level != SOL_IP)
1042 return -ENOPROTOOPT;
1043
1044 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
1045 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
1046 ip_setsockopt);
1047
1048 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1049 #ifdef CONFIG_NETFILTER
1050 /* we need to exclude all possible ENOPROTOOPTs except default case */
1051 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
1052 optname != IP_IPSEC_POLICY &&
1053 optname != IP_XFRM_POLICY &&
1054 !ip_mroute_opt(optname)) {
1055 lock_sock(sk);
1056 err = compat_nf_setsockopt(sk, PF_INET, optname,
1057 optval, optlen);
1058 release_sock(sk);
1059 }
1060 #endif
1061 return err;
1062 }
1063 EXPORT_SYMBOL(compat_ip_setsockopt);
1064 #endif
1065
1066 /*
1067 * Get the options. Note for future reference. The GET of IP options gets
1068 * the _received_ ones. The set sets the _sent_ ones.
1069 */
1070
1071 static int do_ip_getsockopt(struct sock *sk, int level, int optname,
1072 char __user *optval, int __user *optlen, unsigned flags)
1073 {
1074 struct inet_sock *inet = inet_sk(sk);
1075 int val;
1076 int len;
1077
1078 if (level != SOL_IP)
1079 return -EOPNOTSUPP;
1080
1081 if (ip_mroute_opt(optname))
1082 return ip_mroute_getsockopt(sk, optname, optval, optlen);
1083
1084 if (get_user(len, optlen))
1085 return -EFAULT;
1086 if (len < 0)
1087 return -EINVAL;
1088
1089 lock_sock(sk);
1090
1091 switch (optname) {
1092 case IP_OPTIONS:
1093 {
1094 unsigned char optbuf[sizeof(struct ip_options)+40];
1095 struct ip_options *opt = (struct ip_options *)optbuf;
1096 struct ip_options_rcu *inet_opt;
1097
1098 inet_opt = rcu_dereference_protected(inet->inet_opt,
1099 sock_owned_by_user(sk));
1100 opt->optlen = 0;
1101 if (inet_opt)
1102 memcpy(optbuf, &inet_opt->opt,
1103 sizeof(struct ip_options) +
1104 inet_opt->opt.optlen);
1105 release_sock(sk);
1106
1107 if (opt->optlen == 0)
1108 return put_user(0, optlen);
1109
1110 ip_options_undo(opt);
1111
1112 len = min_t(unsigned int, len, opt->optlen);
1113 if (put_user(len, optlen))
1114 return -EFAULT;
1115 if (copy_to_user(optval, opt->__data, len))
1116 return -EFAULT;
1117 return 0;
1118 }
1119 case IP_PKTINFO:
1120 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
1121 break;
1122 case IP_RECVTTL:
1123 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1124 break;
1125 case IP_RECVTOS:
1126 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1127 break;
1128 case IP_RECVOPTS:
1129 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1130 break;
1131 case IP_RETOPTS:
1132 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1133 break;
1134 case IP_PASSSEC:
1135 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1136 break;
1137 case IP_RECVORIGDSTADDR:
1138 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0;
1139 break;
1140 case IP_TOS:
1141 val = inet->tos;
1142 break;
1143 case IP_TTL:
1144 val = (inet->uc_ttl == -1 ?
1145 sysctl_ip_default_ttl :
1146 inet->uc_ttl);
1147 break;
1148 case IP_HDRINCL:
1149 val = inet->hdrincl;
1150 break;
1151 case IP_NODEFRAG:
1152 val = inet->nodefrag;
1153 break;
1154 case IP_MTU_DISCOVER:
1155 val = inet->pmtudisc;
1156 break;
1157 case IP_MTU:
1158 {
1159 struct dst_entry *dst;
1160 val = 0;
1161 dst = sk_dst_get(sk);
1162 if (dst) {
1163 val = dst_mtu(dst);
1164 dst_release(dst);
1165 }
1166 if (!val) {
1167 release_sock(sk);
1168 return -ENOTCONN;
1169 }
1170 break;
1171 }
1172 case IP_RECVERR:
1173 val = inet->recverr;
1174 break;
1175 case IP_MULTICAST_TTL:
1176 val = inet->mc_ttl;
1177 break;
1178 case IP_MULTICAST_LOOP:
1179 val = inet->mc_loop;
1180 break;
1181 case IP_MULTICAST_IF:
1182 {
1183 struct in_addr addr;
1184 len = min_t(unsigned int, len, sizeof(struct in_addr));
1185 addr.s_addr = inet->mc_addr;
1186 release_sock(sk);
1187
1188 if (put_user(len, optlen))
1189 return -EFAULT;
1190 if (copy_to_user(optval, &addr, len))
1191 return -EFAULT;
1192 return 0;
1193 }
1194 case IP_MSFILTER:
1195 {
1196 struct ip_msfilter msf;
1197 int err;
1198
1199 if (len < IP_MSFILTER_SIZE(0)) {
1200 release_sock(sk);
1201 return -EINVAL;
1202 }
1203 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1204 release_sock(sk);
1205 return -EFAULT;
1206 }
1207 err = ip_mc_msfget(sk, &msf,
1208 (struct ip_msfilter __user *)optval, optlen);
1209 release_sock(sk);
1210 return err;
1211 }
1212 case MCAST_MSFILTER:
1213 {
1214 struct group_filter gsf;
1215 int err;
1216
1217 if (len < GROUP_FILTER_SIZE(0)) {
1218 release_sock(sk);
1219 return -EINVAL;
1220 }
1221 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1222 release_sock(sk);
1223 return -EFAULT;
1224 }
1225 err = ip_mc_gsfget(sk, &gsf,
1226 (struct group_filter __user *)optval,
1227 optlen);
1228 release_sock(sk);
1229 return err;
1230 }
1231 case IP_MULTICAST_ALL:
1232 val = inet->mc_all;
1233 break;
1234 case IP_PKTOPTIONS:
1235 {
1236 struct msghdr msg;
1237
1238 release_sock(sk);
1239
1240 if (sk->sk_type != SOCK_STREAM)
1241 return -ENOPROTOOPT;
1242
1243 msg.msg_control = optval;
1244 msg.msg_controllen = len;
1245 msg.msg_flags = flags;
1246
1247 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1248 struct in_pktinfo info;
1249
1250 info.ipi_addr.s_addr = inet->inet_rcv_saddr;
1251 info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr;
1252 info.ipi_ifindex = inet->mc_index;
1253 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1254 }
1255 if (inet->cmsg_flags & IP_CMSG_TTL) {
1256 int hlim = inet->mc_ttl;
1257 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1258 }
1259 len -= msg.msg_controllen;
1260 return put_user(len, optlen);
1261 }
1262 case IP_FREEBIND:
1263 val = inet->freebind;
1264 break;
1265 case IP_TRANSPARENT:
1266 val = inet->transparent;
1267 break;
1268 case IP_MINTTL:
1269 val = inet->min_ttl;
1270 break;
1271 default:
1272 release_sock(sk);
1273 return -ENOPROTOOPT;
1274 }
1275 release_sock(sk);
1276
1277 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) {
1278 unsigned char ucval = (unsigned char)val;
1279 len = 1;
1280 if (put_user(len, optlen))
1281 return -EFAULT;
1282 if (copy_to_user(optval, &ucval, 1))
1283 return -EFAULT;
1284 } else {
1285 len = min_t(unsigned int, sizeof(int), len);
1286 if (put_user(len, optlen))
1287 return -EFAULT;
1288 if (copy_to_user(optval, &val, len))
1289 return -EFAULT;
1290 }
1291 return 0;
1292 }
1293
1294 int ip_getsockopt(struct sock *sk, int level,
1295 int optname, char __user *optval, int __user *optlen)
1296 {
1297 int err;
1298
1299 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0);
1300 #ifdef CONFIG_NETFILTER
1301 /* we need to exclude all possible ENOPROTOOPTs except default case */
1302 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1303 !ip_mroute_opt(optname)) {
1304 int len;
1305
1306 if (get_user(len, optlen))
1307 return -EFAULT;
1308
1309 lock_sock(sk);
1310 err = nf_getsockopt(sk, PF_INET, optname, optval,
1311 &len);
1312 release_sock(sk);
1313 if (err >= 0)
1314 err = put_user(len, optlen);
1315 return err;
1316 }
1317 #endif
1318 return err;
1319 }
1320 EXPORT_SYMBOL(ip_getsockopt);
1321
1322 #ifdef CONFIG_COMPAT
1323 int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1324 char __user *optval, int __user *optlen)
1325 {
1326 int err;
1327
1328 if (optname == MCAST_MSFILTER)
1329 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1330 ip_getsockopt);
1331
1332 err = do_ip_getsockopt(sk, level, optname, optval, optlen,
1333 MSG_CMSG_COMPAT);
1334
1335 #ifdef CONFIG_NETFILTER
1336 /* we need to exclude all possible ENOPROTOOPTs except default case */
1337 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1338 !ip_mroute_opt(optname)) {
1339 int len;
1340
1341 if (get_user(len, optlen))
1342 return -EFAULT;
1343
1344 lock_sock(sk);
1345 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
1346 release_sock(sk);
1347 if (err >= 0)
1348 err = put_user(len, optlen);
1349 return err;
1350 }
1351 #endif
1352 return err;
1353 }
1354 EXPORT_SYMBOL(compat_ip_getsockopt);
1355 #endif
Linus' kernel tree