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net: Add getsockopt support for TCP thin-streams
[deliverable/linux.git] / net / ipv4 / ip_sockglue.c
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/route.h>
37 #include <net/xfrm.h>
38 #include <net/compat.h>
39 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
40 #include <net/transp_v6.h>
41 #endif
42
43 #include <linux/errqueue.h>
44 #include <asm/uaccess.h>
45
46 #define IP_CMSG_PKTINFO 1
47 #define IP_CMSG_TTL 2
48 #define IP_CMSG_TOS 4
49 #define IP_CMSG_RECVOPTS 8
50 #define IP_CMSG_RETOPTS 16
51 #define IP_CMSG_PASSSEC 32
52 #define IP_CMSG_ORIGDSTADDR 64
53
54 /*
55 * SOL_IP control messages.
56 */
57
58 static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
59 {
60 struct in_pktinfo info;
61 struct rtable *rt = skb_rtable(skb);
62
63 info.ipi_addr.s_addr = ip_hdr(skb)->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
75 static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
76 {
77 int ttl = ip_hdr(skb)->ttl;
78 put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
79 }
80
81 static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
82 {
83 put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos);
84 }
85
86 static 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,
92 ip_hdr(skb) + 1);
93 }
94
95
96 static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb)
97 {
98 unsigned char optbuf[sizeof(struct ip_options) + 40];
99 struct ip_options * opt = (struct ip_options *)optbuf;
100
101 if (IPCB(skb)->opt.optlen == 0)
102 return;
103
104 if (ip_options_echo(opt, skb)) {
105 msg->msg_flags |= MSG_CTRUNC;
106 return;
107 }
108 ip_options_undo(opt);
109
110 put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data);
111 }
112
113 static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
114 {
115 char *secdata;
116 u32 seclen, secid;
117 int err;
118
119 err = security_socket_getpeersec_dgram(NULL, skb, &secid);
120 if (err)
121 return;
122
123 err = security_secid_to_secctx(secid, &secdata, &seclen);
124 if (err)
125 return;
126
127 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
128 security_release_secctx(secdata, seclen);
129 }
130
131 static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
132 {
133 struct sockaddr_in sin;
134 struct iphdr *iph = ip_hdr(skb);
135 __be16 *ports = (__be16 *)skb_transport_header(skb);
136
137 if (skb_transport_offset(skb) + 4 > skb->len)
138 return;
139
140 /* All current transport protocols have the port numbers in the
141 * first four bytes of the transport header and this function is
142 * written with this assumption in mind.
143 */
144
145 sin.sin_family = AF_INET;
146 sin.sin_addr.s_addr = iph->daddr;
147 sin.sin_port = ports[1];
148 memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
149
150 put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin);
151 }
152
153 void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
154 {
155 struct inet_sock *inet = inet_sk(skb->sk);
156 unsigned flags = inet->cmsg_flags;
157
158 /* Ordered by supposed usage frequency */
159 if (flags & 1)
160 ip_cmsg_recv_pktinfo(msg, skb);
161 if ((flags >>= 1) == 0)
162 return;
163
164 if (flags & 1)
165 ip_cmsg_recv_ttl(msg, skb);
166 if ((flags >>= 1) == 0)
167 return;
168
169 if (flags & 1)
170 ip_cmsg_recv_tos(msg, skb);
171 if ((flags >>= 1) == 0)
172 return;
173
174 if (flags & 1)
175 ip_cmsg_recv_opts(msg, skb);
176 if ((flags >>= 1) == 0)
177 return;
178
179 if (flags & 1)
180 ip_cmsg_recv_retopts(msg, skb);
181 if ((flags >>= 1) == 0)
182 return;
183
184 if (flags & 1)
185 ip_cmsg_recv_security(msg, skb);
186
187 if ((flags >>= 1) == 0)
188 return;
189 if (flags & 1)
190 ip_cmsg_recv_dstaddr(msg, skb);
191
192 }
193 EXPORT_SYMBOL(ip_cmsg_recv);
194
195 int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc)
196 {
197 int err;
198 struct cmsghdr *cmsg;
199
200 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
201 if (!CMSG_OK(msg, cmsg))
202 return -EINVAL;
203 if (cmsg->cmsg_level != SOL_IP)
204 continue;
205 switch (cmsg->cmsg_type) {
206 case IP_RETOPTS:
207 err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
208 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg),
209 err < 40 ? err : 40);
210 if (err)
211 return err;
212 break;
213 case IP_PKTINFO:
214 {
215 struct in_pktinfo *info;
216 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
217 return -EINVAL;
218 info = (struct in_pktinfo *)CMSG_DATA(cmsg);
219 ipc->oif = info->ipi_ifindex;
220 ipc->addr = info->ipi_spec_dst.s_addr;
221 break;
222 }
223 default:
224 return -EINVAL;
225 }
226 }
227 return 0;
228 }
229
230
231 /* Special input handler for packets caught by router alert option.
232 They are selected only by protocol field, and then processed likely
233 local ones; but only if someone wants them! Otherwise, router
234 not running rsvpd will kill RSVP.
235
236 It is user level problem, what it will make with them.
237 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
238 but receiver should be enough clever f.e. to forward mtrace requests,
239 sent to multicast group to reach destination designated router.
240 */
241 struct ip_ra_chain *ip_ra_chain;
242 static DEFINE_SPINLOCK(ip_ra_lock);
243
244
245 static void ip_ra_destroy_rcu(struct rcu_head *head)
246 {
247 struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu);
248
249 sock_put(ra->saved_sk);
250 kfree(ra);
251 }
252
253 int ip_ra_control(struct sock *sk, unsigned char on,
254 void (*destructor)(struct sock *))
255 {
256 struct ip_ra_chain *ra, *new_ra, **rap;
257
258 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW)
259 return -EINVAL;
260
261 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
262
263 spin_lock_bh(&ip_ra_lock);
264 for (rap = &ip_ra_chain; (ra = *rap) != NULL; rap = &ra->next) {
265 if (ra->sk == sk) {
266 if (on) {
267 spin_unlock_bh(&ip_ra_lock);
268 kfree(new_ra);
269 return -EADDRINUSE;
270 }
271 /* dont let ip_call_ra_chain() use sk again */
272 ra->sk = NULL;
273 rcu_assign_pointer(*rap, ra->next);
274 spin_unlock_bh(&ip_ra_lock);
275
276 if (ra->destructor)
277 ra->destructor(sk);
278 /*
279 * Delay sock_put(sk) and kfree(ra) after one rcu grace
280 * period. This guarantee ip_call_ra_chain() dont need
281 * to mess with socket refcounts.
282 */
283 ra->saved_sk = sk;
284 call_rcu(&ra->rcu, ip_ra_destroy_rcu);
285 return 0;
286 }
287 }
288 if (new_ra == NULL) {
289 spin_unlock_bh(&ip_ra_lock);
290 return -ENOBUFS;
291 }
292 new_ra->sk = sk;
293 new_ra->destructor = destructor;
294
295 new_ra->next = ra;
296 rcu_assign_pointer(*rap, new_ra);
297 sock_hold(sk);
298 spin_unlock_bh(&ip_ra_lock);
299
300 return 0;
301 }
302
303 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
304 __be16 port, u32 info, u8 *payload)
305 {
306 struct sock_exterr_skb *serr;
307
308 skb = skb_clone(skb, GFP_ATOMIC);
309 if (!skb)
310 return;
311
312 serr = SKB_EXT_ERR(skb);
313 serr->ee.ee_errno = err;
314 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
315 serr->ee.ee_type = icmp_hdr(skb)->type;
316 serr->ee.ee_code = icmp_hdr(skb)->code;
317 serr->ee.ee_pad = 0;
318 serr->ee.ee_info = info;
319 serr->ee.ee_data = 0;
320 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
321 skb_network_header(skb);
322 serr->port = port;
323
324 if (skb_pull(skb, payload - skb->data) != NULL) {
325 skb_reset_transport_header(skb);
326 if (sock_queue_err_skb(sk, skb) == 0)
327 return;
328 }
329 kfree_skb(skb);
330 }
331
332 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
333 {
334 struct inet_sock *inet = inet_sk(sk);
335 struct sock_exterr_skb *serr;
336 struct iphdr *iph;
337 struct sk_buff *skb;
338
339 if (!inet->recverr)
340 return;
341
342 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
343 if (!skb)
344 return;
345
346 skb_put(skb, sizeof(struct iphdr));
347 skb_reset_network_header(skb);
348 iph = ip_hdr(skb);
349 iph->daddr = daddr;
350
351 serr = SKB_EXT_ERR(skb);
352 serr->ee.ee_errno = err;
353 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
354 serr->ee.ee_type = 0;
355 serr->ee.ee_code = 0;
356 serr->ee.ee_pad = 0;
357 serr->ee.ee_info = info;
358 serr->ee.ee_data = 0;
359 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
360 serr->port = port;
361
362 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
363 skb_reset_transport_header(skb);
364
365 if (sock_queue_err_skb(sk, skb))
366 kfree_skb(skb);
367 }
368
369 /*
370 * Handle MSG_ERRQUEUE
371 */
372 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len)
373 {
374 struct sock_exterr_skb *serr;
375 struct sk_buff *skb, *skb2;
376 struct sockaddr_in *sin;
377 struct {
378 struct sock_extended_err ee;
379 struct sockaddr_in offender;
380 } errhdr;
381 int err;
382 int copied;
383
384 err = -EAGAIN;
385 skb = skb_dequeue(&sk->sk_error_queue);
386 if (skb == NULL)
387 goto out;
388
389 copied = skb->len;
390 if (copied > len) {
391 msg->msg_flags |= MSG_TRUNC;
392 copied = len;
393 }
394 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
395 if (err)
396 goto out_free_skb;
397
398 sock_recv_timestamp(msg, sk, skb);
399
400 serr = SKB_EXT_ERR(skb);
401
402 sin = (struct sockaddr_in *)msg->msg_name;
403 if (sin) {
404 sin->sin_family = AF_INET;
405 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
406 serr->addr_offset);
407 sin->sin_port = serr->port;
408 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
409 }
410
411 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
412 sin = &errhdr.offender;
413 sin->sin_family = AF_UNSPEC;
414 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
415 struct inet_sock *inet = inet_sk(sk);
416
417 sin->sin_family = AF_INET;
418 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
419 sin->sin_port = 0;
420 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
421 if (inet->cmsg_flags)
422 ip_cmsg_recv(msg, skb);
423 }
424
425 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
426
427 /* Now we could try to dump offended packet options */
428
429 msg->msg_flags |= MSG_ERRQUEUE;
430 err = copied;
431
432 /* Reset and regenerate socket error */
433 spin_lock_bh(&sk->sk_error_queue.lock);
434 sk->sk_err = 0;
435 skb2 = skb_peek(&sk->sk_error_queue);
436 if (skb2 != NULL) {
437 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
438 spin_unlock_bh(&sk->sk_error_queue.lock);
439 sk->sk_error_report(sk);
440 } else
441 spin_unlock_bh(&sk->sk_error_queue.lock);
442
443 out_free_skb:
444 kfree_skb(skb);
445 out:
446 return err;
447 }
448
449
450 /*
451 * Socket option code for IP. This is the end of the line after any
452 * TCP,UDP etc options on an IP socket.
453 */
454
455 static int do_ip_setsockopt(struct sock *sk, int level,
456 int optname, char __user *optval, unsigned int optlen)
457 {
458 struct inet_sock *inet = inet_sk(sk);
459 int val = 0, err;
460
461 if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) |
462 (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) |
463 (1<<IP_RETOPTS) | (1<<IP_TOS) |
464 (1<<IP_TTL) | (1<<IP_HDRINCL) |
465 (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) |
466 (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) |
467 (1<<IP_PASSSEC) | (1<<IP_TRANSPARENT) |
468 (1<<IP_MINTTL) | (1<<IP_NODEFRAG))) ||
469 optname == IP_MULTICAST_TTL ||
470 optname == IP_MULTICAST_ALL ||
471 optname == IP_MULTICAST_LOOP ||
472 optname == IP_RECVORIGDSTADDR) {
473 if (optlen >= sizeof(int)) {
474 if (get_user(val, (int __user *) optval))
475 return -EFAULT;
476 } else if (optlen >= sizeof(char)) {
477 unsigned char ucval;
478
479 if (get_user(ucval, (unsigned char __user *) optval))
480 return -EFAULT;
481 val = (int) ucval;
482 }
483 }
484
485 /* If optlen==0, it is equivalent to val == 0 */
486
487 if (ip_mroute_opt(optname))
488 return ip_mroute_setsockopt(sk, optname, optval, optlen);
489
490 err = 0;
491 lock_sock(sk);
492
493 switch (optname) {
494 case IP_OPTIONS:
495 {
496 struct ip_options *opt = NULL;
497 if (optlen > 40)
498 goto e_inval;
499 err = ip_options_get_from_user(sock_net(sk), &opt,
500 optval, optlen);
501 if (err)
502 break;
503 if (inet->is_icsk) {
504 struct inet_connection_sock *icsk = inet_csk(sk);
505 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
506 if (sk->sk_family == PF_INET ||
507 (!((1 << sk->sk_state) &
508 (TCPF_LISTEN | TCPF_CLOSE)) &&
509 inet->inet_daddr != LOOPBACK4_IPV6)) {
510 #endif
511 if (inet->opt)
512 icsk->icsk_ext_hdr_len -= inet->opt->optlen;
513 if (opt)
514 icsk->icsk_ext_hdr_len += opt->optlen;
515 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
516 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
517 }
518 #endif
519 }
520 opt = xchg(&inet->opt, opt);
521 kfree(opt);
522 break;
523 }
524 case IP_PKTINFO:
525 if (val)
526 inet->cmsg_flags |= IP_CMSG_PKTINFO;
527 else
528 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
529 break;
530 case IP_RECVTTL:
531 if (val)
532 inet->cmsg_flags |= IP_CMSG_TTL;
533 else
534 inet->cmsg_flags &= ~IP_CMSG_TTL;
535 break;
536 case IP_RECVTOS:
537 if (val)
538 inet->cmsg_flags |= IP_CMSG_TOS;
539 else
540 inet->cmsg_flags &= ~IP_CMSG_TOS;
541 break;
542 case IP_RECVOPTS:
543 if (val)
544 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
545 else
546 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
547 break;
548 case IP_RETOPTS:
549 if (val)
550 inet->cmsg_flags |= IP_CMSG_RETOPTS;
551 else
552 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
553 break;
554 case IP_PASSSEC:
555 if (val)
556 inet->cmsg_flags |= IP_CMSG_PASSSEC;
557 else
558 inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
559 break;
560 case IP_RECVORIGDSTADDR:
561 if (val)
562 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR;
563 else
564 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR;
565 break;
566 case IP_TOS: /* This sets both TOS and Precedence */
567 if (sk->sk_type == SOCK_STREAM) {
568 val &= ~3;
569 val |= inet->tos & 3;
570 }
571 if (inet->tos != val) {
572 inet->tos = val;
573 sk->sk_priority = rt_tos2priority(val);
574 sk_dst_reset(sk);
575 }
576 break;
577 case IP_TTL:
578 if (optlen < 1)
579 goto e_inval;
580 if (val != -1 && (val < 0 || val > 255))
581 goto e_inval;
582 inet->uc_ttl = val;
583 break;
584 case IP_HDRINCL:
585 if (sk->sk_type != SOCK_RAW) {
586 err = -ENOPROTOOPT;
587 break;
588 }
589 inet->hdrincl = val ? 1 : 0;
590 break;
591 case IP_NODEFRAG:
592 if (sk->sk_type != SOCK_RAW) {
593 err = -ENOPROTOOPT;
594 break;
595 }
596 inet->nodefrag = val ? 1 : 0;
597 break;
598 case IP_MTU_DISCOVER:
599 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_PROBE)
600 goto e_inval;
601 inet->pmtudisc = val;
602 break;
603 case IP_RECVERR:
604 inet->recverr = !!val;
605 if (!val)
606 skb_queue_purge(&sk->sk_error_queue);
607 break;
608 case IP_MULTICAST_TTL:
609 if (sk->sk_type == SOCK_STREAM)
610 goto e_inval;
611 if (optlen < 1)
612 goto e_inval;
613 if (val == -1)
614 val = 1;
615 if (val < 0 || val > 255)
616 goto e_inval;
617 inet->mc_ttl = val;
618 break;
619 case IP_MULTICAST_LOOP:
620 if (optlen < 1)
621 goto e_inval;
622 inet->mc_loop = !!val;
623 break;
624 case IP_MULTICAST_IF:
625 {
626 struct ip_mreqn mreq;
627 struct net_device *dev = NULL;
628
629 if (sk->sk_type == SOCK_STREAM)
630 goto e_inval;
631 /*
632 * Check the arguments are allowable
633 */
634
635 if (optlen < sizeof(struct in_addr))
636 goto e_inval;
637
638 err = -EFAULT;
639 if (optlen >= sizeof(struct ip_mreqn)) {
640 if (copy_from_user(&mreq, optval, sizeof(mreq)))
641 break;
642 } else {
643 memset(&mreq, 0, sizeof(mreq));
644 if (optlen >= sizeof(struct in_addr) &&
645 copy_from_user(&mreq.imr_address, optval,
646 sizeof(struct in_addr)))
647 break;
648 }
649
650 if (!mreq.imr_ifindex) {
651 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
652 inet->mc_index = 0;
653 inet->mc_addr = 0;
654 err = 0;
655 break;
656 }
657 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
658 if (dev)
659 mreq.imr_ifindex = dev->ifindex;
660 } else
661 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
662
663
664 err = -EADDRNOTAVAIL;
665 if (!dev)
666 break;
667 dev_put(dev);
668
669 err = -EINVAL;
670 if (sk->sk_bound_dev_if &&
671 mreq.imr_ifindex != sk->sk_bound_dev_if)
672 break;
673
674 inet->mc_index = mreq.imr_ifindex;
675 inet->mc_addr = mreq.imr_address.s_addr;
676 err = 0;
677 break;
678 }
679
680 case IP_ADD_MEMBERSHIP:
681 case IP_DROP_MEMBERSHIP:
682 {
683 struct ip_mreqn mreq;
684
685 err = -EPROTO;
686 if (inet_sk(sk)->is_icsk)
687 break;
688
689 if (optlen < sizeof(struct ip_mreq))
690 goto e_inval;
691 err = -EFAULT;
692 if (optlen >= sizeof(struct ip_mreqn)) {
693 if (copy_from_user(&mreq, optval, sizeof(mreq)))
694 break;
695 } else {
696 memset(&mreq, 0, sizeof(mreq));
697 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq)))
698 break;
699 }
700
701 if (optname == IP_ADD_MEMBERSHIP)
702 err = ip_mc_join_group(sk, &mreq);
703 else
704 err = ip_mc_leave_group(sk, &mreq);
705 break;
706 }
707 case IP_MSFILTER:
708 {
709 struct ip_msfilter *msf;
710
711 if (optlen < IP_MSFILTER_SIZE(0))
712 goto e_inval;
713 if (optlen > sysctl_optmem_max) {
714 err = -ENOBUFS;
715 break;
716 }
717 msf = kmalloc(optlen, GFP_KERNEL);
718 if (!msf) {
719 err = -ENOBUFS;
720 break;
721 }
722 err = -EFAULT;
723 if (copy_from_user(msf, optval, optlen)) {
724 kfree(msf);
725 break;
726 }
727 /* numsrc >= (1G-4) overflow in 32 bits */
728 if (msf->imsf_numsrc >= 0x3ffffffcU ||
729 msf->imsf_numsrc > sysctl_igmp_max_msf) {
730 kfree(msf);
731 err = -ENOBUFS;
732 break;
733 }
734 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
735 kfree(msf);
736 err = -EINVAL;
737 break;
738 }
739 err = ip_mc_msfilter(sk, msf, 0);
740 kfree(msf);
741 break;
742 }
743 case IP_BLOCK_SOURCE:
744 case IP_UNBLOCK_SOURCE:
745 case IP_ADD_SOURCE_MEMBERSHIP:
746 case IP_DROP_SOURCE_MEMBERSHIP:
747 {
748 struct ip_mreq_source mreqs;
749 int omode, add;
750
751 if (optlen != sizeof(struct ip_mreq_source))
752 goto e_inval;
753 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
754 err = -EFAULT;
755 break;
756 }
757 if (optname == IP_BLOCK_SOURCE) {
758 omode = MCAST_EXCLUDE;
759 add = 1;
760 } else if (optname == IP_UNBLOCK_SOURCE) {
761 omode = MCAST_EXCLUDE;
762 add = 0;
763 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
764 struct ip_mreqn mreq;
765
766 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
767 mreq.imr_address.s_addr = mreqs.imr_interface;
768 mreq.imr_ifindex = 0;
769 err = ip_mc_join_group(sk, &mreq);
770 if (err && err != -EADDRINUSE)
771 break;
772 omode = MCAST_INCLUDE;
773 add = 1;
774 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
775 omode = MCAST_INCLUDE;
776 add = 0;
777 }
778 err = ip_mc_source(add, omode, sk, &mreqs, 0);
779 break;
780 }
781 case MCAST_JOIN_GROUP:
782 case MCAST_LEAVE_GROUP:
783 {
784 struct group_req greq;
785 struct sockaddr_in *psin;
786 struct ip_mreqn mreq;
787
788 if (optlen < sizeof(struct group_req))
789 goto e_inval;
790 err = -EFAULT;
791 if (copy_from_user(&greq, optval, sizeof(greq)))
792 break;
793 psin = (struct sockaddr_in *)&greq.gr_group;
794 if (psin->sin_family != AF_INET)
795 goto e_inval;
796 memset(&mreq, 0, sizeof(mreq));
797 mreq.imr_multiaddr = psin->sin_addr;
798 mreq.imr_ifindex = greq.gr_interface;
799
800 if (optname == MCAST_JOIN_GROUP)
801 err = ip_mc_join_group(sk, &mreq);
802 else
803 err = ip_mc_leave_group(sk, &mreq);
804 break;
805 }
806 case MCAST_JOIN_SOURCE_GROUP:
807 case MCAST_LEAVE_SOURCE_GROUP:
808 case MCAST_BLOCK_SOURCE:
809 case MCAST_UNBLOCK_SOURCE:
810 {
811 struct group_source_req greqs;
812 struct ip_mreq_source mreqs;
813 struct sockaddr_in *psin;
814 int omode, add;
815
816 if (optlen != sizeof(struct group_source_req))
817 goto e_inval;
818 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
819 err = -EFAULT;
820 break;
821 }
822 if (greqs.gsr_group.ss_family != AF_INET ||
823 greqs.gsr_source.ss_family != AF_INET) {
824 err = -EADDRNOTAVAIL;
825 break;
826 }
827 psin = (struct sockaddr_in *)&greqs.gsr_group;
828 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
829 psin = (struct sockaddr_in *)&greqs.gsr_source;
830 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
831 mreqs.imr_interface = 0; /* use index for mc_source */
832
833 if (optname == MCAST_BLOCK_SOURCE) {
834 omode = MCAST_EXCLUDE;
835 add = 1;
836 } else if (optname == MCAST_UNBLOCK_SOURCE) {
837 omode = MCAST_EXCLUDE;
838 add = 0;
839 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
840 struct ip_mreqn mreq;
841
842 psin = (struct sockaddr_in *)&greqs.gsr_group;
843 mreq.imr_multiaddr = psin->sin_addr;
844 mreq.imr_address.s_addr = 0;
845 mreq.imr_ifindex = greqs.gsr_interface;
846 err = ip_mc_join_group(sk, &mreq);
847 if (err && err != -EADDRINUSE)
848 break;
849 greqs.gsr_interface = mreq.imr_ifindex;
850 omode = MCAST_INCLUDE;
851 add = 1;
852 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
853 omode = MCAST_INCLUDE;
854 add = 0;
855 }
856 err = ip_mc_source(add, omode, sk, &mreqs,
857 greqs.gsr_interface);
858 break;
859 }
860 case MCAST_MSFILTER:
861 {
862 struct sockaddr_in *psin;
863 struct ip_msfilter *msf = NULL;
864 struct group_filter *gsf = NULL;
865 int msize, i, ifindex;
866
867 if (optlen < GROUP_FILTER_SIZE(0))
868 goto e_inval;
869 if (optlen > sysctl_optmem_max) {
870 err = -ENOBUFS;
871 break;
872 }
873 gsf = kmalloc(optlen, GFP_KERNEL);
874 if (!gsf) {
875 err = -ENOBUFS;
876 break;
877 }
878 err = -EFAULT;
879 if (copy_from_user(gsf, optval, optlen))
880 goto mc_msf_out;
881
882 /* numsrc >= (4G-140)/128 overflow in 32 bits */
883 if (gsf->gf_numsrc >= 0x1ffffff ||
884 gsf->gf_numsrc > sysctl_igmp_max_msf) {
885 err = -ENOBUFS;
886 goto mc_msf_out;
887 }
888 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
889 err = -EINVAL;
890 goto mc_msf_out;
891 }
892 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
893 msf = kmalloc(msize, GFP_KERNEL);
894 if (!msf) {
895 err = -ENOBUFS;
896 goto mc_msf_out;
897 }
898 ifindex = gsf->gf_interface;
899 psin = (struct sockaddr_in *)&gsf->gf_group;
900 if (psin->sin_family != AF_INET) {
901 err = -EADDRNOTAVAIL;
902 goto mc_msf_out;
903 }
904 msf->imsf_multiaddr = psin->sin_addr.s_addr;
905 msf->imsf_interface = 0;
906 msf->imsf_fmode = gsf->gf_fmode;
907 msf->imsf_numsrc = gsf->gf_numsrc;
908 err = -EADDRNOTAVAIL;
909 for (i = 0; i < gsf->gf_numsrc; ++i) {
910 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
911
912 if (psin->sin_family != AF_INET)
913 goto mc_msf_out;
914 msf->imsf_slist[i] = psin->sin_addr.s_addr;
915 }
916 kfree(gsf);
917 gsf = NULL;
918
919 err = ip_mc_msfilter(sk, msf, ifindex);
920 mc_msf_out:
921 kfree(msf);
922 kfree(gsf);
923 break;
924 }
925 case IP_MULTICAST_ALL:
926 if (optlen < 1)
927 goto e_inval;
928 if (val != 0 && val != 1)
929 goto e_inval;
930 inet->mc_all = val;
931 break;
932 case IP_ROUTER_ALERT:
933 err = ip_ra_control(sk, val ? 1 : 0, NULL);
934 break;
935
936 case IP_FREEBIND:
937 if (optlen < 1)
938 goto e_inval;
939 inet->freebind = !!val;
940 break;
941
942 case IP_IPSEC_POLICY:
943 case IP_XFRM_POLICY:
944 err = -EPERM;
945 if (!capable(CAP_NET_ADMIN))
946 break;
947 err = xfrm_user_policy(sk, optname, optval, optlen);
948 break;
949
950 case IP_TRANSPARENT:
951 if (!capable(CAP_NET_ADMIN)) {
952 err = -EPERM;
953 break;
954 }
955 if (optlen < 1)
956 goto e_inval;
957 inet->transparent = !!val;
958 break;
959
960 case IP_MINTTL:
961 if (optlen < 1)
962 goto e_inval;
963 if (val < 0 || val > 255)
964 goto e_inval;
965 inet->min_ttl = val;
966 break;
967
968 default:
969 err = -ENOPROTOOPT;
970 break;
971 }
972 release_sock(sk);
973 return err;
974
975 e_inval:
976 release_sock(sk);
977 return -EINVAL;
978 }
979
980 /**
981 * ip_queue_rcv_skb - Queue an skb into sock receive queue
982 * @sk: socket
983 * @skb: buffer
984 *
985 * Queues an skb into socket receive queue. If IP_CMSG_PKTINFO option
986 * is not set, we drop skb dst entry now, while dst cache line is hot.
987 */
988 int ip_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
989 {
990 if (!(inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO))
991 skb_dst_drop(skb);
992 return sock_queue_rcv_skb(sk, skb);
993 }
994 EXPORT_SYMBOL(ip_queue_rcv_skb);
995
996 int ip_setsockopt(struct sock *sk, int level,
997 int optname, char __user *optval, unsigned int optlen)
998 {
999 int err;
1000
1001 if (level != SOL_IP)
1002 return -ENOPROTOOPT;
1003
1004 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1005 #ifdef CONFIG_NETFILTER
1006 /* we need to exclude all possible ENOPROTOOPTs except default case */
1007 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
1008 optname != IP_IPSEC_POLICY &&
1009 optname != IP_XFRM_POLICY &&
1010 !ip_mroute_opt(optname)) {
1011 lock_sock(sk);
1012 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
1013 release_sock(sk);
1014 }
1015 #endif
1016 return err;
1017 }
1018 EXPORT_SYMBOL(ip_setsockopt);
1019
1020 #ifdef CONFIG_COMPAT
1021 int compat_ip_setsockopt(struct sock *sk, int level, int optname,
1022 char __user *optval, unsigned int optlen)
1023 {
1024 int err;
1025
1026 if (level != SOL_IP)
1027 return -ENOPROTOOPT;
1028
1029 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
1030 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
1031 ip_setsockopt);
1032
1033 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1034 #ifdef CONFIG_NETFILTER
1035 /* we need to exclude all possible ENOPROTOOPTs except default case */
1036 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
1037 optname != IP_IPSEC_POLICY &&
1038 optname != IP_XFRM_POLICY &&
1039 !ip_mroute_opt(optname)) {
1040 lock_sock(sk);
1041 err = compat_nf_setsockopt(sk, PF_INET, optname,
1042 optval, optlen);
1043 release_sock(sk);
1044 }
1045 #endif
1046 return err;
1047 }
1048 EXPORT_SYMBOL(compat_ip_setsockopt);
1049 #endif
1050
1051 /*
1052 * Get the options. Note for future reference. The GET of IP options gets
1053 * the _received_ ones. The set sets the _sent_ ones.
1054 */
1055
1056 static int do_ip_getsockopt(struct sock *sk, int level, int optname,
1057 char __user *optval, int __user *optlen)
1058 {
1059 struct inet_sock *inet = inet_sk(sk);
1060 int val;
1061 int len;
1062
1063 if (level != SOL_IP)
1064 return -EOPNOTSUPP;
1065
1066 if (ip_mroute_opt(optname))
1067 return ip_mroute_getsockopt(sk, optname, optval, optlen);
1068
1069 if (get_user(len, optlen))
1070 return -EFAULT;
1071 if (len < 0)
1072 return -EINVAL;
1073
1074 lock_sock(sk);
1075
1076 switch (optname) {
1077 case IP_OPTIONS:
1078 {
1079 unsigned char optbuf[sizeof(struct ip_options)+40];
1080 struct ip_options * opt = (struct ip_options *)optbuf;
1081 opt->optlen = 0;
1082 if (inet->opt)
1083 memcpy(optbuf, inet->opt,
1084 sizeof(struct ip_options)+
1085 inet->opt->optlen);
1086 release_sock(sk);
1087
1088 if (opt->optlen == 0)
1089 return put_user(0, optlen);
1090
1091 ip_options_undo(opt);
1092
1093 len = min_t(unsigned int, len, opt->optlen);
1094 if (put_user(len, optlen))
1095 return -EFAULT;
1096 if (copy_to_user(optval, opt->__data, len))
1097 return -EFAULT;
1098 return 0;
1099 }
1100 case IP_PKTINFO:
1101 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
1102 break;
1103 case IP_RECVTTL:
1104 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1105 break;
1106 case IP_RECVTOS:
1107 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1108 break;
1109 case IP_RECVOPTS:
1110 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1111 break;
1112 case IP_RETOPTS:
1113 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1114 break;
1115 case IP_PASSSEC:
1116 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1117 break;
1118 case IP_RECVORIGDSTADDR:
1119 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0;
1120 break;
1121 case IP_TOS:
1122 val = inet->tos;
1123 break;
1124 case IP_TTL:
1125 val = (inet->uc_ttl == -1 ?
1126 sysctl_ip_default_ttl :
1127 inet->uc_ttl);
1128 break;
1129 case IP_HDRINCL:
1130 val = inet->hdrincl;
1131 break;
1132 case IP_MTU_DISCOVER:
1133 val = inet->pmtudisc;
1134 break;
1135 case IP_MTU:
1136 {
1137 struct dst_entry *dst;
1138 val = 0;
1139 dst = sk_dst_get(sk);
1140 if (dst) {
1141 val = dst_mtu(dst);
1142 dst_release(dst);
1143 }
1144 if (!val) {
1145 release_sock(sk);
1146 return -ENOTCONN;
1147 }
1148 break;
1149 }
1150 case IP_RECVERR:
1151 val = inet->recverr;
1152 break;
1153 case IP_MULTICAST_TTL:
1154 val = inet->mc_ttl;
1155 break;
1156 case IP_MULTICAST_LOOP:
1157 val = inet->mc_loop;
1158 break;
1159 case IP_MULTICAST_IF:
1160 {
1161 struct in_addr addr;
1162 len = min_t(unsigned int, len, sizeof(struct in_addr));
1163 addr.s_addr = inet->mc_addr;
1164 release_sock(sk);
1165
1166 if (put_user(len, optlen))
1167 return -EFAULT;
1168 if (copy_to_user(optval, &addr, len))
1169 return -EFAULT;
1170 return 0;
1171 }
1172 case IP_MSFILTER:
1173 {
1174 struct ip_msfilter msf;
1175 int err;
1176
1177 if (len < IP_MSFILTER_SIZE(0)) {
1178 release_sock(sk);
1179 return -EINVAL;
1180 }
1181 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1182 release_sock(sk);
1183 return -EFAULT;
1184 }
1185 err = ip_mc_msfget(sk, &msf,
1186 (struct ip_msfilter __user *)optval, optlen);
1187 release_sock(sk);
1188 return err;
1189 }
1190 case MCAST_MSFILTER:
1191 {
1192 struct group_filter gsf;
1193 int err;
1194
1195 if (len < GROUP_FILTER_SIZE(0)) {
1196 release_sock(sk);
1197 return -EINVAL;
1198 }
1199 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1200 release_sock(sk);
1201 return -EFAULT;
1202 }
1203 err = ip_mc_gsfget(sk, &gsf,
1204 (struct group_filter __user *)optval,
1205 optlen);
1206 release_sock(sk);
1207 return err;
1208 }
1209 case IP_MULTICAST_ALL:
1210 val = inet->mc_all;
1211 break;
1212 case IP_PKTOPTIONS:
1213 {
1214 struct msghdr msg;
1215
1216 release_sock(sk);
1217
1218 if (sk->sk_type != SOCK_STREAM)
1219 return -ENOPROTOOPT;
1220
1221 msg.msg_control = optval;
1222 msg.msg_controllen = len;
1223 msg.msg_flags = 0;
1224
1225 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1226 struct in_pktinfo info;
1227
1228 info.ipi_addr.s_addr = inet->inet_rcv_saddr;
1229 info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr;
1230 info.ipi_ifindex = inet->mc_index;
1231 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1232 }
1233 if (inet->cmsg_flags & IP_CMSG_TTL) {
1234 int hlim = inet->mc_ttl;
1235 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1236 }
1237 len -= msg.msg_controllen;
1238 return put_user(len, optlen);
1239 }
1240 case IP_FREEBIND:
1241 val = inet->freebind;
1242 break;
1243 case IP_TRANSPARENT:
1244 val = inet->transparent;
1245 break;
1246 case IP_MINTTL:
1247 val = inet->min_ttl;
1248 break;
1249 default:
1250 release_sock(sk);
1251 return -ENOPROTOOPT;
1252 }
1253 release_sock(sk);
1254
1255 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) {
1256 unsigned char ucval = (unsigned char)val;
1257 len = 1;
1258 if (put_user(len, optlen))
1259 return -EFAULT;
1260 if (copy_to_user(optval, &ucval, 1))
1261 return -EFAULT;
1262 } else {
1263 len = min_t(unsigned int, sizeof(int), len);
1264 if (put_user(len, optlen))
1265 return -EFAULT;
1266 if (copy_to_user(optval, &val, len))
1267 return -EFAULT;
1268 }
1269 return 0;
1270 }
1271
1272 int ip_getsockopt(struct sock *sk, int level,
1273 int optname, char __user *optval, int __user *optlen)
1274 {
1275 int err;
1276
1277 err = do_ip_getsockopt(sk, level, optname, optval, optlen);
1278 #ifdef CONFIG_NETFILTER
1279 /* we need to exclude all possible ENOPROTOOPTs except default case */
1280 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1281 !ip_mroute_opt(optname)) {
1282 int len;
1283
1284 if (get_user(len, optlen))
1285 return -EFAULT;
1286
1287 lock_sock(sk);
1288 err = nf_getsockopt(sk, PF_INET, optname, optval,
1289 &len);
1290 release_sock(sk);
1291 if (err >= 0)
1292 err = put_user(len, optlen);
1293 return err;
1294 }
1295 #endif
1296 return err;
1297 }
1298 EXPORT_SYMBOL(ip_getsockopt);
1299
1300 #ifdef CONFIG_COMPAT
1301 int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1302 char __user *optval, int __user *optlen)
1303 {
1304 int err;
1305
1306 if (optname == MCAST_MSFILTER)
1307 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1308 ip_getsockopt);
1309
1310 err = do_ip_getsockopt(sk, level, optname, optval, optlen);
1311
1312 #ifdef CONFIG_NETFILTER
1313 /* we need to exclude all possible ENOPROTOOPTs except default case */
1314 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1315 !ip_mroute_opt(optname)) {
1316 int len;
1317
1318 if (get_user(len, optlen))
1319 return -EFAULT;
1320
1321 lock_sock(sk);
1322 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
1323 release_sock(sk);
1324 if (err >= 0)
1325 err = put_user(len, optlen);
1326 return err;
1327 }
1328 #endif
1329 return err;
1330 }
1331 EXPORT_SYMBOL(compat_ip_getsockopt);
1332 #endif
Linux kernel - Deliverables
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