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Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / net / ipv4 / ip_sockglue.c
blobc2921d01e925d2b06c7f43620c16673bfba92df4
1 /*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * The IP to API glue.
7 *
8 * Version: $Id: ip_sockglue.c,v 1.62 2002/02/01 22:01:04 davem Exp $
9 *
10 * Authors: see ip.c
11 *
12 * Fixes:
13 * Many : Split from ip.c , see ip.c for history.
14 * Martin Mares : TOS setting fixed.
15 * Alan Cox : Fixed a couple of oopses in Martin's
16 * TOS tweaks.
17 * Mike McLagan : Routing by source
18 */
19
20 #include <linux/module.h>
21 #include <linux/types.h>
22 #include <linux/mm.h>
23 #include <linux/skbuff.h>
24 #include <linux/ip.h>
25 #include <linux/icmp.h>
26 #include <linux/inetdevice.h>
27 #include <linux/netdevice.h>
28 #include <net/sock.h>
29 #include <net/ip.h>
30 #include <net/icmp.h>
31 #include <net/tcp_states.h>
32 #include <linux/udp.h>
33 #include <linux/igmp.h>
34 #include <linux/netfilter.h>
35 #include <linux/route.h>
36 #include <linux/mroute.h>
37 #include <net/route.h>
38 #include <net/xfrm.h>
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
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 = (struct rtable *)skb->dst;
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
131 void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
132 {
133 struct inet_sock *inet = inet_sk(skb->sk);
134 unsigned flags = inet->cmsg_flags;
135
136 /* Ordered by supposed usage frequency */
137 if (flags & 1)
138 ip_cmsg_recv_pktinfo(msg, skb);
139 if ((flags>>=1) == 0)
140 return;
141
142 if (flags & 1)
143 ip_cmsg_recv_ttl(msg, skb);
144 if ((flags>>=1) == 0)
145 return;
146
147 if (flags & 1)
148 ip_cmsg_recv_tos(msg, skb);
149 if ((flags>>=1) == 0)
150 return;
151
152 if (flags & 1)
153 ip_cmsg_recv_opts(msg, skb);
154 if ((flags>>=1) == 0)
155 return;
156
157 if (flags & 1)
158 ip_cmsg_recv_retopts(msg, skb);
159 if ((flags>>=1) == 0)
160 return;
161
162 if (flags & 1)
163 ip_cmsg_recv_security(msg, skb);
164 }
165
166 int ip_cmsg_send(struct msghdr *msg, struct ipcm_cookie *ipc)
167 {
168 int err;
169 struct cmsghdr *cmsg;
170
171 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
172 if (!CMSG_OK(msg, cmsg))
173 return -EINVAL;
174 if (cmsg->cmsg_level != SOL_IP)
175 continue;
176 switch (cmsg->cmsg_type) {
177 case IP_RETOPTS:
178 err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
179 err = ip_options_get(&ipc->opt, CMSG_DATA(cmsg), err < 40 ? err : 40);
180 if (err)
181 return err;
182 break;
183 case IP_PKTINFO:
184 {
185 struct in_pktinfo *info;
186 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
187 return -EINVAL;
188 info = (struct in_pktinfo *)CMSG_DATA(cmsg);
189 ipc->oif = info->ipi_ifindex;
190 ipc->addr = info->ipi_spec_dst.s_addr;
191 break;
192 }
193 default:
194 return -EINVAL;
195 }
196 }
197 return 0;
198 }
199
200
201 /* Special input handler for packets caught by router alert option.
202 They are selected only by protocol field, and then processed likely
203 local ones; but only if someone wants them! Otherwise, router
204 not running rsvpd will kill RSVP.
205
206 It is user level problem, what it will make with them.
207 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
208 but receiver should be enough clever f.e. to forward mtrace requests,
209 sent to multicast group to reach destination designated router.
210 */
211 struct ip_ra_chain *ip_ra_chain;
212 DEFINE_RWLOCK(ip_ra_lock);
213
214 int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *))
215 {
216 struct ip_ra_chain *ra, *new_ra, **rap;
217
218 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num == IPPROTO_RAW)
219 return -EINVAL;
220
221 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
222
223 write_lock_bh(&ip_ra_lock);
224 for (rap = &ip_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
225 if (ra->sk == sk) {
226 if (on) {
227 write_unlock_bh(&ip_ra_lock);
228 kfree(new_ra);
229 return -EADDRINUSE;
230 }
231 *rap = ra->next;
232 write_unlock_bh(&ip_ra_lock);
233
234 if (ra->destructor)
235 ra->destructor(sk);
236 sock_put(sk);
237 kfree(ra);
238 return 0;
239 }
240 }
241 if (new_ra == NULL) {
242 write_unlock_bh(&ip_ra_lock);
243 return -ENOBUFS;
244 }
245 new_ra->sk = sk;
246 new_ra->destructor = destructor;
247
248 new_ra->next = ra;
249 *rap = new_ra;
250 sock_hold(sk);
251 write_unlock_bh(&ip_ra_lock);
252
253 return 0;
254 }
255
256 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
257 __be16 port, u32 info, u8 *payload)
258 {
259 struct inet_sock *inet = inet_sk(sk);
260 struct sock_exterr_skb *serr;
261
262 if (!inet->recverr)
263 return;
264
265 skb = skb_clone(skb, GFP_ATOMIC);
266 if (!skb)
267 return;
268
269 serr = SKB_EXT_ERR(skb);
270 serr->ee.ee_errno = err;
271 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
272 serr->ee.ee_type = icmp_hdr(skb)->type;
273 serr->ee.ee_code = icmp_hdr(skb)->code;
274 serr->ee.ee_pad = 0;
275 serr->ee.ee_info = info;
276 serr->ee.ee_data = 0;
277 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
278 skb_network_header(skb);
279 serr->port = port;
280
281 if (skb_pull(skb, payload - skb->data) != NULL) {
282 skb_reset_transport_header(skb);
283 if (sock_queue_err_skb(sk, skb) == 0)
284 return;
285 }
286 kfree_skb(skb);
287 }
288
289 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
290 {
291 struct inet_sock *inet = inet_sk(sk);
292 struct sock_exterr_skb *serr;
293 struct iphdr *iph;
294 struct sk_buff *skb;
295
296 if (!inet->recverr)
297 return;
298
299 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
300 if (!skb)
301 return;
302
303 skb_put(skb, sizeof(struct iphdr));
304 skb_reset_network_header(skb);
305 iph = ip_hdr(skb);
306 iph->daddr = daddr;
307
308 serr = SKB_EXT_ERR(skb);
309 serr->ee.ee_errno = err;
310 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
311 serr->ee.ee_type = 0;
312 serr->ee.ee_code = 0;
313 serr->ee.ee_pad = 0;
314 serr->ee.ee_info = info;
315 serr->ee.ee_data = 0;
316 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
317 serr->port = port;
318
319 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
320 skb_reset_transport_header(skb);
321
322 if (sock_queue_err_skb(sk, skb))
323 kfree_skb(skb);
324 }
325
326 /*
327 * Handle MSG_ERRQUEUE
328 */
329 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len)
330 {
331 struct sock_exterr_skb *serr;
332 struct sk_buff *skb, *skb2;
333 struct sockaddr_in *sin;
334 struct {
335 struct sock_extended_err ee;
336 struct sockaddr_in offender;
337 } errhdr;
338 int err;
339 int copied;
340
341 err = -EAGAIN;
342 skb = skb_dequeue(&sk->sk_error_queue);
343 if (skb == NULL)
344 goto out;
345
346 copied = skb->len;
347 if (copied > len) {
348 msg->msg_flags |= MSG_TRUNC;
349 copied = len;
350 }
351 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
352 if (err)
353 goto out_free_skb;
354
355 sock_recv_timestamp(msg, sk, skb);
356
357 serr = SKB_EXT_ERR(skb);
358
359 sin = (struct sockaddr_in *)msg->msg_name;
360 if (sin) {
361 sin->sin_family = AF_INET;
362 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
363 serr->addr_offset);
364 sin->sin_port = serr->port;
365 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
366 }
367
368 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
369 sin = &errhdr.offender;
370 sin->sin_family = AF_UNSPEC;
371 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
372 struct inet_sock *inet = inet_sk(sk);
373
374 sin->sin_family = AF_INET;
375 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
376 sin->sin_port = 0;
377 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
378 if (inet->cmsg_flags)
379 ip_cmsg_recv(msg, skb);
380 }
381
382 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
383
384 /* Now we could try to dump offended packet options */
385
386 msg->msg_flags |= MSG_ERRQUEUE;
387 err = copied;
388
389 /* Reset and regenerate socket error */
390 spin_lock_bh(&sk->sk_error_queue.lock);
391 sk->sk_err = 0;
392 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
393 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
394 spin_unlock_bh(&sk->sk_error_queue.lock);
395 sk->sk_error_report(sk);
396 } else
397 spin_unlock_bh(&sk->sk_error_queue.lock);
398
399 out_free_skb:
400 kfree_skb(skb);
401 out:
402 return err;
403 }
404
405
406 /*
407 * Socket option code for IP. This is the end of the line after any TCP,UDP etc options on
408 * an IP socket.
409 */
410
411 static int do_ip_setsockopt(struct sock *sk, int level,
412 int optname, char __user *optval, int optlen)
413 {
414 struct inet_sock *inet = inet_sk(sk);
415 int val=0,err;
416
417 if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) |
418 (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) |
419 (1<<IP_RETOPTS) | (1<<IP_TOS) |
420 (1<<IP_TTL) | (1<<IP_HDRINCL) |
421 (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) |
422 (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) |
423 (1<<IP_PASSSEC))) ||
424 optname == IP_MULTICAST_TTL ||
425 optname == IP_MULTICAST_LOOP) {
426 if (optlen >= sizeof(int)) {
427 if (get_user(val, (int __user *) optval))
428 return -EFAULT;
429 } else if (optlen >= sizeof(char)) {
430 unsigned char ucval;
431
432 if (get_user(ucval, (unsigned char __user *) optval))
433 return -EFAULT;
434 val = (int) ucval;
435 }
436 }
437
438 /* If optlen==0, it is equivalent to val == 0 */
439
440 if (ip_mroute_opt(optname))
441 return ip_mroute_setsockopt(sk,optname,optval,optlen);
442
443 err = 0;
444 lock_sock(sk);
445
446 switch (optname) {
447 case IP_OPTIONS:
448 {
449 struct ip_options * opt = NULL;
450 if (optlen > 40 || optlen < 0)
451 goto e_inval;
452 err = ip_options_get_from_user(&opt, optval, optlen);
453 if (err)
454 break;
455 if (inet->is_icsk) {
456 struct inet_connection_sock *icsk = inet_csk(sk);
457 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
458 if (sk->sk_family == PF_INET ||
459 (!((1 << sk->sk_state) &
460 (TCPF_LISTEN | TCPF_CLOSE)) &&
461 inet->daddr != LOOPBACK4_IPV6)) {
462 #endif
463 if (inet->opt)
464 icsk->icsk_ext_hdr_len -= inet->opt->optlen;
465 if (opt)
466 icsk->icsk_ext_hdr_len += opt->optlen;
467 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
468 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
469 }
470 #endif
471 }
472 opt = xchg(&inet->opt, opt);
473 kfree(opt);
474 break;
475 }
476 case IP_PKTINFO:
477 if (val)
478 inet->cmsg_flags |= IP_CMSG_PKTINFO;
479 else
480 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
481 break;
482 case IP_RECVTTL:
483 if (val)
484 inet->cmsg_flags |= IP_CMSG_TTL;
485 else
486 inet->cmsg_flags &= ~IP_CMSG_TTL;
487 break;
488 case IP_RECVTOS:
489 if (val)
490 inet->cmsg_flags |= IP_CMSG_TOS;
491 else
492 inet->cmsg_flags &= ~IP_CMSG_TOS;
493 break;
494 case IP_RECVOPTS:
495 if (val)
496 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
497 else
498 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
499 break;
500 case IP_RETOPTS:
501 if (val)
502 inet->cmsg_flags |= IP_CMSG_RETOPTS;
503 else
504 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
505 break;
506 case IP_PASSSEC:
507 if (val)
508 inet->cmsg_flags |= IP_CMSG_PASSSEC;
509 else
510 inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
511 break;
512 case IP_TOS: /* This sets both TOS and Precedence */
513 if (sk->sk_type == SOCK_STREAM) {
514 val &= ~3;
515 val |= inet->tos & 3;
516 }
517 if (inet->tos != val) {
518 inet->tos = val;
519 sk->sk_priority = rt_tos2priority(val);
520 sk_dst_reset(sk);
521 }
522 break;
523 case IP_TTL:
524 if (optlen<1)
525 goto e_inval;
526 if (val != -1 && (val < 1 || val>255))
527 goto e_inval;
528 inet->uc_ttl = val;
529 break;
530 case IP_HDRINCL:
531 if (sk->sk_type != SOCK_RAW) {
532 err = -ENOPROTOOPT;
533 break;
534 }
535 inet->hdrincl = val ? 1 : 0;
536 break;
537 case IP_MTU_DISCOVER:
538 if (val<0 || val>3)
539 goto e_inval;
540 inet->pmtudisc = val;
541 break;
542 case IP_RECVERR:
543 inet->recverr = !!val;
544 if (!val)
545 skb_queue_purge(&sk->sk_error_queue);
546 break;
547 case IP_MULTICAST_TTL:
548 if (sk->sk_type == SOCK_STREAM)
549 goto e_inval;
550 if (optlen<1)
551 goto e_inval;
552 if (val==-1)
553 val = 1;
554 if (val < 0 || val > 255)
555 goto e_inval;
556 inet->mc_ttl = val;
557 break;
558 case IP_MULTICAST_LOOP:
559 if (optlen<1)
560 goto e_inval;
561 inet->mc_loop = !!val;
562 break;
563 case IP_MULTICAST_IF:
564 {
565 struct ip_mreqn mreq;
566 struct net_device *dev = NULL;
567
568 if (sk->sk_type == SOCK_STREAM)
569 goto e_inval;
570 /*
571 * Check the arguments are allowable
572 */
573
574 err = -EFAULT;
575 if (optlen >= sizeof(struct ip_mreqn)) {
576 if (copy_from_user(&mreq,optval,sizeof(mreq)))
577 break;
578 } else {
579 memset(&mreq, 0, sizeof(mreq));
580 if (optlen >= sizeof(struct in_addr) &&
581 copy_from_user(&mreq.imr_address,optval,sizeof(struct in_addr)))
582 break;
583 }
584
585 if (!mreq.imr_ifindex) {
586 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
587 inet->mc_index = 0;
588 inet->mc_addr = 0;
589 err = 0;
590 break;
591 }
592 dev = ip_dev_find(&init_net, mreq.imr_address.s_addr);
593 if (dev) {
594 mreq.imr_ifindex = dev->ifindex;
595 dev_put(dev);
596 }
597 } else
598 dev = __dev_get_by_index(&init_net, mreq.imr_ifindex);
599
600
601 err = -EADDRNOTAVAIL;
602 if (!dev)
603 break;
604
605 err = -EINVAL;
606 if (sk->sk_bound_dev_if &&
607 mreq.imr_ifindex != sk->sk_bound_dev_if)
608 break;
609
610 inet->mc_index = mreq.imr_ifindex;
611 inet->mc_addr = mreq.imr_address.s_addr;
612 err = 0;
613 break;
614 }
615
616 case IP_ADD_MEMBERSHIP:
617 case IP_DROP_MEMBERSHIP:
618 {
619 struct ip_mreqn mreq;
620
621 err = -EPROTO;
622 if (inet_sk(sk)->is_icsk)
623 break;
624
625 if (optlen < sizeof(struct ip_mreq))
626 goto e_inval;
627 err = -EFAULT;
628 if (optlen >= sizeof(struct ip_mreqn)) {
629 if (copy_from_user(&mreq,optval,sizeof(mreq)))
630 break;
631 } else {
632 memset(&mreq, 0, sizeof(mreq));
633 if (copy_from_user(&mreq,optval,sizeof(struct ip_mreq)))
634 break;
635 }
636
637 if (optname == IP_ADD_MEMBERSHIP)
638 err = ip_mc_join_group(sk, &mreq);
639 else
640 err = ip_mc_leave_group(sk, &mreq);
641 break;
642 }
643 case IP_MSFILTER:
644 {
645 extern int sysctl_igmp_max_msf;
646 struct ip_msfilter *msf;
647
648 if (optlen < IP_MSFILTER_SIZE(0))
649 goto e_inval;
650 if (optlen > sysctl_optmem_max) {
651 err = -ENOBUFS;
652 break;
653 }
654 msf = kmalloc(optlen, GFP_KERNEL);
655 if (!msf) {
656 err = -ENOBUFS;
657 break;
658 }
659 err = -EFAULT;
660 if (copy_from_user(msf, optval, optlen)) {
661 kfree(msf);
662 break;
663 }
664 /* numsrc >= (1G-4) overflow in 32 bits */
665 if (msf->imsf_numsrc >= 0x3ffffffcU ||
666 msf->imsf_numsrc > sysctl_igmp_max_msf) {
667 kfree(msf);
668 err = -ENOBUFS;
669 break;
670 }
671 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
672 kfree(msf);
673 err = -EINVAL;
674 break;
675 }
676 err = ip_mc_msfilter(sk, msf, 0);
677 kfree(msf);
678 break;
679 }
680 case IP_BLOCK_SOURCE:
681 case IP_UNBLOCK_SOURCE:
682 case IP_ADD_SOURCE_MEMBERSHIP:
683 case IP_DROP_SOURCE_MEMBERSHIP:
684 {
685 struct ip_mreq_source mreqs;
686 int omode, add;
687
688 if (optlen != sizeof(struct ip_mreq_source))
689 goto e_inval;
690 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
691 err = -EFAULT;
692 break;
693 }
694 if (optname == IP_BLOCK_SOURCE) {
695 omode = MCAST_EXCLUDE;
696 add = 1;
697 } else if (optname == IP_UNBLOCK_SOURCE) {
698 omode = MCAST_EXCLUDE;
699 add = 0;
700 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
701 struct ip_mreqn mreq;
702
703 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
704 mreq.imr_address.s_addr = mreqs.imr_interface;
705 mreq.imr_ifindex = 0;
706 err = ip_mc_join_group(sk, &mreq);
707 if (err && err != -EADDRINUSE)
708 break;
709 omode = MCAST_INCLUDE;
710 add = 1;
711 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
712 omode = MCAST_INCLUDE;
713 add = 0;
714 }
715 err = ip_mc_source(add, omode, sk, &mreqs, 0);
716 break;
717 }
718 case MCAST_JOIN_GROUP:
719 case MCAST_LEAVE_GROUP:
720 {
721 struct group_req greq;
722 struct sockaddr_in *psin;
723 struct ip_mreqn mreq;
724
725 if (optlen < sizeof(struct group_req))
726 goto e_inval;
727 err = -EFAULT;
728 if (copy_from_user(&greq, optval, sizeof(greq)))
729 break;
730 psin = (struct sockaddr_in *)&greq.gr_group;
731 if (psin->sin_family != AF_INET)
732 goto e_inval;
733 memset(&mreq, 0, sizeof(mreq));
734 mreq.imr_multiaddr = psin->sin_addr;
735 mreq.imr_ifindex = greq.gr_interface;
736
737 if (optname == MCAST_JOIN_GROUP)
738 err = ip_mc_join_group(sk, &mreq);
739 else
740 err = ip_mc_leave_group(sk, &mreq);
741 break;
742 }
743 case MCAST_JOIN_SOURCE_GROUP:
744 case MCAST_LEAVE_SOURCE_GROUP:
745 case MCAST_BLOCK_SOURCE:
746 case MCAST_UNBLOCK_SOURCE:
747 {
748 struct group_source_req greqs;
749 struct ip_mreq_source mreqs;
750 struct sockaddr_in *psin;
751 int omode, add;
752
753 if (optlen != sizeof(struct group_source_req))
754 goto e_inval;
755 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
756 err = -EFAULT;
757 break;
758 }
759 if (greqs.gsr_group.ss_family != AF_INET ||
760 greqs.gsr_source.ss_family != AF_INET) {
761 err = -EADDRNOTAVAIL;
762 break;
763 }
764 psin = (struct sockaddr_in *)&greqs.gsr_group;
765 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
766 psin = (struct sockaddr_in *)&greqs.gsr_source;
767 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
768 mreqs.imr_interface = 0; /* use index for mc_source */
769
770 if (optname == MCAST_BLOCK_SOURCE) {
771 omode = MCAST_EXCLUDE;
772 add = 1;
773 } else if (optname == MCAST_UNBLOCK_SOURCE) {
774 omode = MCAST_EXCLUDE;
775 add = 0;
776 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
777 struct ip_mreqn mreq;
778
779 psin = (struct sockaddr_in *)&greqs.gsr_group;
780 mreq.imr_multiaddr = psin->sin_addr;
781 mreq.imr_address.s_addr = 0;
782 mreq.imr_ifindex = greqs.gsr_interface;
783 err = ip_mc_join_group(sk, &mreq);
784 if (err && err != -EADDRINUSE)
785 break;
786 greqs.gsr_interface = mreq.imr_ifindex;
787 omode = MCAST_INCLUDE;
788 add = 1;
789 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
790 omode = MCAST_INCLUDE;
791 add = 0;
792 }
793 err = ip_mc_source(add, omode, sk, &mreqs,
794 greqs.gsr_interface);
795 break;
796 }
797 case MCAST_MSFILTER:
798 {
799 extern int sysctl_igmp_max_msf;
800 struct sockaddr_in *psin;
801 struct ip_msfilter *msf = NULL;
802 struct group_filter *gsf = NULL;
803 int msize, i, ifindex;
804
805 if (optlen < GROUP_FILTER_SIZE(0))
806 goto e_inval;
807 if (optlen > sysctl_optmem_max) {
808 err = -ENOBUFS;
809 break;
810 }
811 gsf = kmalloc(optlen,GFP_KERNEL);
812 if (!gsf) {
813 err = -ENOBUFS;
814 break;
815 }
816 err = -EFAULT;
817 if (copy_from_user(gsf, optval, optlen)) {
818 goto mc_msf_out;
819 }
820 /* numsrc >= (4G-140)/128 overflow in 32 bits */
821 if (gsf->gf_numsrc >= 0x1ffffff ||
822 gsf->gf_numsrc > sysctl_igmp_max_msf) {
823 err = -ENOBUFS;
824 goto mc_msf_out;
825 }
826 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
827 err = -EINVAL;
828 goto mc_msf_out;
829 }
830 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
831 msf = kmalloc(msize,GFP_KERNEL);
832 if (!msf) {
833 err = -ENOBUFS;
834 goto mc_msf_out;
835 }
836 ifindex = gsf->gf_interface;
837 psin = (struct sockaddr_in *)&gsf->gf_group;
838 if (psin->sin_family != AF_INET) {
839 err = -EADDRNOTAVAIL;
840 goto mc_msf_out;
841 }
842 msf->imsf_multiaddr = psin->sin_addr.s_addr;
843 msf->imsf_interface = 0;
844 msf->imsf_fmode = gsf->gf_fmode;
845 msf->imsf_numsrc = gsf->gf_numsrc;
846 err = -EADDRNOTAVAIL;
847 for (i=0; i<gsf->gf_numsrc; ++i) {
848 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
849
850 if (psin->sin_family != AF_INET)
851 goto mc_msf_out;
852 msf->imsf_slist[i] = psin->sin_addr.s_addr;
853 }
854 kfree(gsf);
855 gsf = NULL;
856
857 err = ip_mc_msfilter(sk, msf, ifindex);
858 mc_msf_out:
859 kfree(msf);
860 kfree(gsf);
861 break;
862 }
863 case IP_ROUTER_ALERT:
864 err = ip_ra_control(sk, val ? 1 : 0, NULL);
865 break;
866
867 case IP_FREEBIND:
868 if (optlen<1)
869 goto e_inval;
870 inet->freebind = !!val;
871 break;
872
873 case IP_IPSEC_POLICY:
874 case IP_XFRM_POLICY:
875 err = -EPERM;
876 if (!capable(CAP_NET_ADMIN))
877 break;
878 err = xfrm_user_policy(sk, optname, optval, optlen);
879 break;
880
881 default:
882 err = -ENOPROTOOPT;
883 break;
884 }
885 release_sock(sk);
886 return err;
887
888 e_inval:
889 release_sock(sk);
890 return -EINVAL;
891 }
892
893 int ip_setsockopt(struct sock *sk, int level,
894 int optname, char __user *optval, int optlen)
895 {
896 int err;
897
898 if (level != SOL_IP)
899 return -ENOPROTOOPT;
900
901 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
902 #ifdef CONFIG_NETFILTER
903 /* we need to exclude all possible ENOPROTOOPTs except default case */
904 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
905 optname != IP_IPSEC_POLICY &&
906 optname != IP_XFRM_POLICY &&
907 !ip_mroute_opt(optname)) {
908 lock_sock(sk);
909 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
910 release_sock(sk);
911 }
912 #endif
913 return err;
914 }
915
916 #ifdef CONFIG_COMPAT
917 int compat_ip_setsockopt(struct sock *sk, int level, int optname,
918 char __user *optval, int optlen)
919 {
920 int err;
921
922 if (level != SOL_IP)
923 return -ENOPROTOOPT;
924
925 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
926 #ifdef CONFIG_NETFILTER
927 /* we need to exclude all possible ENOPROTOOPTs except default case */
928 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
929 optname != IP_IPSEC_POLICY &&
930 optname != IP_XFRM_POLICY &&
931 !ip_mroute_opt(optname)) {
932 lock_sock(sk);
933 err = compat_nf_setsockopt(sk, PF_INET, optname,
934 optval, optlen);
935 release_sock(sk);
936 }
937 #endif
938 return err;
939 }
940
941 EXPORT_SYMBOL(compat_ip_setsockopt);
942 #endif
943
944 /*
945 * Get the options. Note for future reference. The GET of IP options gets the
946 * _received_ ones. The set sets the _sent_ ones.
947 */
948
949 static int do_ip_getsockopt(struct sock *sk, int level, int optname,
950 char __user *optval, int __user *optlen)
951 {
952 struct inet_sock *inet = inet_sk(sk);
953 int val;
954 int len;
955
956 if (level != SOL_IP)
957 return -EOPNOTSUPP;
958
959 if (ip_mroute_opt(optname))
960 return ip_mroute_getsockopt(sk,optname,optval,optlen);
961
962 if (get_user(len,optlen))
963 return -EFAULT;
964 if (len < 0)
965 return -EINVAL;
966
967 lock_sock(sk);
968
969 switch (optname) {
970 case IP_OPTIONS:
971 {
972 unsigned char optbuf[sizeof(struct ip_options)+40];
973 struct ip_options * opt = (struct ip_options*)optbuf;
974 opt->optlen = 0;
975 if (inet->opt)
976 memcpy(optbuf, inet->opt,
977 sizeof(struct ip_options)+
978 inet->opt->optlen);
979 release_sock(sk);
980
981 if (opt->optlen == 0)
982 return put_user(0, optlen);
983
984 ip_options_undo(opt);
985
986 len = min_t(unsigned int, len, opt->optlen);
987 if (put_user(len, optlen))
988 return -EFAULT;
989 if (copy_to_user(optval, opt->__data, len))
990 return -EFAULT;
991 return 0;
992 }
993 case IP_PKTINFO:
994 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
995 break;
996 case IP_RECVTTL:
997 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
998 break;
999 case IP_RECVTOS:
1000 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1001 break;
1002 case IP_RECVOPTS:
1003 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1004 break;
1005 case IP_RETOPTS:
1006 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1007 break;
1008 case IP_PASSSEC:
1009 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1010 break;
1011 case IP_TOS:
1012 val = inet->tos;
1013 break;
1014 case IP_TTL:
1015 val = (inet->uc_ttl == -1 ?
1016 sysctl_ip_default_ttl :
1017 inet->uc_ttl);
1018 break;
1019 case IP_HDRINCL:
1020 val = inet->hdrincl;
1021 break;
1022 case IP_MTU_DISCOVER:
1023 val = inet->pmtudisc;
1024 break;
1025 case IP_MTU:
1026 {
1027 struct dst_entry *dst;
1028 val = 0;
1029 dst = sk_dst_get(sk);
1030 if (dst) {
1031 val = dst_mtu(dst);
1032 dst_release(dst);
1033 }
1034 if (!val) {
1035 release_sock(sk);
1036 return -ENOTCONN;
1037 }
1038 break;
1039 }
1040 case IP_RECVERR:
1041 val = inet->recverr;
1042 break;
1043 case IP_MULTICAST_TTL:
1044 val = inet->mc_ttl;
1045 break;
1046 case IP_MULTICAST_LOOP:
1047 val = inet->mc_loop;
1048 break;
1049 case IP_MULTICAST_IF:
1050 {
1051 struct in_addr addr;
1052 len = min_t(unsigned int, len, sizeof(struct in_addr));
1053 addr.s_addr = inet->mc_addr;
1054 release_sock(sk);
1055
1056 if (put_user(len, optlen))
1057 return -EFAULT;
1058 if (copy_to_user(optval, &addr, len))
1059 return -EFAULT;
1060 return 0;
1061 }
1062 case IP_MSFILTER:
1063 {
1064 struct ip_msfilter msf;
1065 int err;
1066
1067 if (len < IP_MSFILTER_SIZE(0)) {
1068 release_sock(sk);
1069 return -EINVAL;
1070 }
1071 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1072 release_sock(sk);
1073 return -EFAULT;
1074 }
1075 err = ip_mc_msfget(sk, &msf,
1076 (struct ip_msfilter __user *)optval, optlen);
1077 release_sock(sk);
1078 return err;
1079 }
1080 case MCAST_MSFILTER:
1081 {
1082 struct group_filter gsf;
1083 int err;
1084
1085 if (len < GROUP_FILTER_SIZE(0)) {
1086 release_sock(sk);
1087 return -EINVAL;
1088 }
1089 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1090 release_sock(sk);
1091 return -EFAULT;
1092 }
1093 err = ip_mc_gsfget(sk, &gsf,
1094 (struct group_filter __user *)optval, optlen);
1095 release_sock(sk);
1096 return err;
1097 }
1098 case IP_PKTOPTIONS:
1099 {
1100 struct msghdr msg;
1101
1102 release_sock(sk);
1103
1104 if (sk->sk_type != SOCK_STREAM)
1105 return -ENOPROTOOPT;
1106
1107 msg.msg_control = optval;
1108 msg.msg_controllen = len;
1109 msg.msg_flags = 0;
1110
1111 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1112 struct in_pktinfo info;
1113
1114 info.ipi_addr.s_addr = inet->rcv_saddr;
1115 info.ipi_spec_dst.s_addr = inet->rcv_saddr;
1116 info.ipi_ifindex = inet->mc_index;
1117 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1118 }
1119 if (inet->cmsg_flags & IP_CMSG_TTL) {
1120 int hlim = inet->mc_ttl;
1121 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1122 }
1123 len -= msg.msg_controllen;
1124 return put_user(len, optlen);
1125 }
1126 case IP_FREEBIND:
1127 val = inet->freebind;
1128 break;
1129 default:
1130 release_sock(sk);
1131 return -ENOPROTOOPT;
1132 }
1133 release_sock(sk);
1134
1135 if (len < sizeof(int) && len > 0 && val>=0 && val<=255) {
1136 unsigned char ucval = (unsigned char)val;
1137 len = 1;
1138 if (put_user(len, optlen))
1139 return -EFAULT;
1140 if (copy_to_user(optval,&ucval,1))
1141 return -EFAULT;
1142 } else {
1143 len = min_t(unsigned int, sizeof(int), len);
1144 if (put_user(len, optlen))
1145 return -EFAULT;
1146 if (copy_to_user(optval,&val,len))
1147 return -EFAULT;
1148 }
1149 return 0;
1150 }
1151
1152 int ip_getsockopt(struct sock *sk, int level,
1153 int optname, char __user *optval, int __user *optlen)
1154 {
1155 int err;
1156
1157 err = do_ip_getsockopt(sk, level, optname, optval, optlen);
1158 #ifdef CONFIG_NETFILTER
1159 /* we need to exclude all possible ENOPROTOOPTs except default case */
1160 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1161 !ip_mroute_opt(optname)) {
1162 int len;
1163
1164 if (get_user(len,optlen))
1165 return -EFAULT;
1166
1167 lock_sock(sk);
1168 err = nf_getsockopt(sk, PF_INET, optname, optval,
1169 &len);
1170 release_sock(sk);
1171 if (err >= 0)
1172 err = put_user(len, optlen);
1173 return err;
1174 }
1175 #endif
1176 return err;
1177 }
1178
1179 #ifdef CONFIG_COMPAT
1180 int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1181 char __user *optval, int __user *optlen)
1182 {
1183 int err = do_ip_getsockopt(sk, level, optname, optval, optlen);
1184 #ifdef CONFIG_NETFILTER
1185 /* we need to exclude all possible ENOPROTOOPTs except default case */
1186 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1187 !ip_mroute_opt(optname)) {
1188 int len;
1189
1190 if (get_user(len, optlen))
1191 return -EFAULT;
1192
1193 lock_sock(sk);
1194 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
1195 release_sock(sk);
1196 if (err >= 0)
1197 err = put_user(len, optlen);
1198 return err;
1199 }
1200 #endif
1201 return err;
1202 }
1203
1204 EXPORT_SYMBOL(compat_ip_getsockopt);
1205 #endif
1206
1207 EXPORT_SYMBOL(ip_cmsg_recv);
1208
1209 EXPORT_SYMBOL(ip_getsockopt);
1210 EXPORT_SYMBOL(ip_setsockopt);
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