?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
initial commit with v2.6.9
[linux-2.6.9-moxart.git] / net / ipv4 / ip_sockglue.c
blob8bb874be141afd0389b959aa26cec660da1d9243
1 /*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * The IP to API glue.
7 *
8 * Version: $Id: ip_sockglue.c,v 1.62 2002/02/01 22:01:04 davem Exp $
9 *
10 * Authors: see ip.c
11 *
12 * Fixes:
13 * Many : Split from ip.c , see ip.c for history.
14 * Martin Mares : TOS setting fixed.
15 * Alan Cox : Fixed a couple of oopses in Martin's
16 * TOS tweaks.
17 * Mike McLagan : Routing by source
18 */
19
20 #include <linux/config.h>
21 #include <linux/module.h>
22 #include <linux/types.h>
23 #include <linux/mm.h>
24 #include <linux/sched.h>
25 #include <linux/skbuff.h>
26 #include <linux/ip.h>
27 #include <linux/icmp.h>
28 #include <linux/netdevice.h>
29 #include <net/sock.h>
30 #include <net/ip.h>
31 #include <net/icmp.h>
32 #include <net/tcp.h>
33 #include <linux/tcp.h>
34 #include <linux/udp.h>
35 #include <linux/igmp.h>
36 #include <linux/netfilter.h>
37 #include <linux/route.h>
38 #include <linux/mroute.h>
39 #include <net/route.h>
40 #include <net/xfrm.h>
41 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
42 #include <net/transp_v6.h>
43 #endif
44
45 #include <linux/errqueue.h>
46 #include <asm/uaccess.h>
47
48 #define IP_CMSG_PKTINFO 1
49 #define IP_CMSG_TTL 2
50 #define IP_CMSG_TOS 4
51 #define IP_CMSG_RECVOPTS 8
52 #define IP_CMSG_RETOPTS 16
53
54 /*
55 * SOL_IP control messages.
56 */
57
58 static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
59 {
60 struct in_pktinfo info;
61 struct rtable *rt = (struct rtable *)skb->dst;
62
63 info.ipi_addr.s_addr = skb->nh.iph->daddr;
64 if (rt) {
65 info.ipi_ifindex = rt->rt_iif;
66 info.ipi_spec_dst.s_addr = rt->rt_spec_dst;
67 } else {
68 info.ipi_ifindex = 0;
69 info.ipi_spec_dst.s_addr = 0;
70 }
71
72 put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
73 }
74
75 static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
76 {
77 int ttl = skb->nh.iph->ttl;
78 put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
79 }
80
81 static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
82 {
83 put_cmsg(msg, SOL_IP, IP_TOS, 1, &skb->nh.iph->tos);
84 }
85
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, skb->nh.iph+1);
92 }
93
94
95 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
113 void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
114 {
115 struct inet_opt *inet = inet_sk(skb->sk);
116 unsigned flags = inet->cmsg_flags;
117
118 /* Ordered by supposed usage frequency */
119 if (flags & 1)
120 ip_cmsg_recv_pktinfo(msg, skb);
121 if ((flags>>=1) == 0)
122 return;
123
124 if (flags & 1)
125 ip_cmsg_recv_ttl(msg, skb);
126 if ((flags>>=1) == 0)
127 return;
128
129 if (flags & 1)
130 ip_cmsg_recv_tos(msg, skb);
131 if ((flags>>=1) == 0)
132 return;
133
134 if (flags & 1)
135 ip_cmsg_recv_opts(msg, skb);
136 if ((flags>>=1) == 0)
137 return;
138
139 if (flags & 1)
140 ip_cmsg_recv_retopts(msg, skb);
141 }
142
143 int ip_cmsg_send(struct msghdr *msg, struct ipcm_cookie *ipc)
144 {
145 int err;
146 struct cmsghdr *cmsg;
147
148 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
149 if (cmsg->cmsg_len < sizeof(struct cmsghdr) ||
150 (unsigned long)(((char*)cmsg - (char*)msg->msg_control)
151 + cmsg->cmsg_len) > msg->msg_controllen) {
152 return -EINVAL;
153 }
154 if (cmsg->cmsg_level != SOL_IP)
155 continue;
156 switch (cmsg->cmsg_type) {
157 case IP_RETOPTS:
158 err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
159 err = ip_options_get(&ipc->opt, CMSG_DATA(cmsg), err < 40 ? err : 40, 0);
160 if (err)
161 return err;
162 break;
163 case IP_PKTINFO:
164 {
165 struct in_pktinfo *info;
166 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
167 return -EINVAL;
168 info = (struct in_pktinfo *)CMSG_DATA(cmsg);
169 ipc->oif = info->ipi_ifindex;
170 ipc->addr = info->ipi_spec_dst.s_addr;
171 break;
172 }
173 default:
174 return -EINVAL;
175 }
176 }
177 return 0;
178 }
179
180
181 /* Special input handler for packets caught by router alert option.
182 They are selected only by protocol field, and then processed likely
183 local ones; but only if someone wants them! Otherwise, router
184 not running rsvpd will kill RSVP.
185
186 It is user level problem, what it will make with them.
187 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
188 but receiver should be enough clever f.e. to forward mtrace requests,
189 sent to multicast group to reach destination designated router.
190 */
191 struct ip_ra_chain *ip_ra_chain;
192 rwlock_t ip_ra_lock = RW_LOCK_UNLOCKED;
193
194 int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *))
195 {
196 struct ip_ra_chain *ra, *new_ra, **rap;
197
198 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num == IPPROTO_RAW)
199 return -EINVAL;
200
201 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
202
203 write_lock_bh(&ip_ra_lock);
204 for (rap = &ip_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
205 if (ra->sk == sk) {
206 if (on) {
207 write_unlock_bh(&ip_ra_lock);
208 if (new_ra)
209 kfree(new_ra);
210 return -EADDRINUSE;
211 }
212 *rap = ra->next;
213 write_unlock_bh(&ip_ra_lock);
214
215 if (ra->destructor)
216 ra->destructor(sk);
217 sock_put(sk);
218 kfree(ra);
219 return 0;
220 }
221 }
222 if (new_ra == NULL) {
223 write_unlock_bh(&ip_ra_lock);
224 return -ENOBUFS;
225 }
226 new_ra->sk = sk;
227 new_ra->destructor = destructor;
228
229 new_ra->next = ra;
230 *rap = new_ra;
231 sock_hold(sk);
232 write_unlock_bh(&ip_ra_lock);
233
234 return 0;
235 }
236
237 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
238 u16 port, u32 info, u8 *payload)
239 {
240 struct inet_opt *inet = inet_sk(sk);
241 struct sock_exterr_skb *serr;
242
243 if (!inet->recverr)
244 return;
245
246 skb = skb_clone(skb, GFP_ATOMIC);
247 if (!skb)
248 return;
249
250 serr = SKB_EXT_ERR(skb);
251 serr->ee.ee_errno = err;
252 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
253 serr->ee.ee_type = skb->h.icmph->type;
254 serr->ee.ee_code = skb->h.icmph->code;
255 serr->ee.ee_pad = 0;
256 serr->ee.ee_info = info;
257 serr->ee.ee_data = 0;
258 serr->addr_offset = (u8*)&(((struct iphdr*)(skb->h.icmph+1))->daddr) - skb->nh.raw;
259 serr->port = port;
260
261 skb->h.raw = payload;
262 if (!skb_pull(skb, payload - skb->data) ||
263 sock_queue_err_skb(sk, skb))
264 kfree_skb(skb);
265 }
266
267 void ip_local_error(struct sock *sk, int err, u32 daddr, u16 port, u32 info)
268 {
269 struct inet_opt *inet = inet_sk(sk);
270 struct sock_exterr_skb *serr;
271 struct iphdr *iph;
272 struct sk_buff *skb;
273
274 if (!inet->recverr)
275 return;
276
277 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
278 if (!skb)
279 return;
280
281 iph = (struct iphdr*)skb_put(skb, sizeof(struct iphdr));
282 skb->nh.iph = iph;
283 iph->daddr = daddr;
284
285 serr = SKB_EXT_ERR(skb);
286 serr->ee.ee_errno = err;
287 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
288 serr->ee.ee_type = 0;
289 serr->ee.ee_code = 0;
290 serr->ee.ee_pad = 0;
291 serr->ee.ee_info = info;
292 serr->ee.ee_data = 0;
293 serr->addr_offset = (u8*)&iph->daddr - skb->nh.raw;
294 serr->port = port;
295
296 skb->h.raw = skb->tail;
297 __skb_pull(skb, skb->tail - skb->data);
298
299 if (sock_queue_err_skb(sk, skb))
300 kfree_skb(skb);
301 }
302
303 /*
304 * Handle MSG_ERRQUEUE
305 */
306 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len)
307 {
308 struct sock_exterr_skb *serr;
309 struct sk_buff *skb, *skb2;
310 struct sockaddr_in *sin;
311 struct {
312 struct sock_extended_err ee;
313 struct sockaddr_in offender;
314 } errhdr;
315 int err;
316 int copied;
317
318 err = -EAGAIN;
319 skb = skb_dequeue(&sk->sk_error_queue);
320 if (skb == NULL)
321 goto out;
322
323 copied = skb->len;
324 if (copied > len) {
325 msg->msg_flags |= MSG_TRUNC;
326 copied = len;
327 }
328 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
329 if (err)
330 goto out_free_skb;
331
332 sock_recv_timestamp(msg, sk, skb);
333
334 serr = SKB_EXT_ERR(skb);
335
336 sin = (struct sockaddr_in *)msg->msg_name;
337 if (sin) {
338 sin->sin_family = AF_INET;
339 sin->sin_addr.s_addr = *(u32*)(skb->nh.raw + serr->addr_offset);
340 sin->sin_port = serr->port;
341 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
342 }
343
344 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
345 sin = &errhdr.offender;
346 sin->sin_family = AF_UNSPEC;
347 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
348 struct inet_opt *inet = inet_sk(sk);
349
350 sin->sin_family = AF_INET;
351 sin->sin_addr.s_addr = skb->nh.iph->saddr;
352 sin->sin_port = 0;
353 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
354 if (inet->cmsg_flags)
355 ip_cmsg_recv(msg, skb);
356 }
357
358 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
359
360 /* Now we could try to dump offended packet options */
361
362 msg->msg_flags |= MSG_ERRQUEUE;
363 err = copied;
364
365 /* Reset and regenerate socket error */
366 spin_lock_irq(&sk->sk_error_queue.lock);
367 sk->sk_err = 0;
368 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
369 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
370 spin_unlock_irq(&sk->sk_error_queue.lock);
371 sk->sk_error_report(sk);
372 } else
373 spin_unlock_irq(&sk->sk_error_queue.lock);
374
375 out_free_skb:
376 kfree_skb(skb);
377 out:
378 return err;
379 }
380
381
382 /*
383 * Socket option code for IP. This is the end of the line after any TCP,UDP etc options on
384 * an IP socket.
385 */
386
387 int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, int optlen)
388 {
389 struct inet_opt *inet = inet_sk(sk);
390 int val=0,err;
391
392 if (level != SOL_IP)
393 return -ENOPROTOOPT;
394
395 if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) |
396 (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) |
397 (1<<IP_RETOPTS) | (1<<IP_TOS) |
398 (1<<IP_TTL) | (1<<IP_HDRINCL) |
399 (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) |
400 (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND))) ||
401 optname == IP_MULTICAST_TTL ||
402 optname == IP_MULTICAST_LOOP) {
403 if (optlen >= sizeof(int)) {
404 if (get_user(val, (int __user *) optval))
405 return -EFAULT;
406 } else if (optlen >= sizeof(char)) {
407 unsigned char ucval;
408
409 if (get_user(ucval, (unsigned char __user *) optval))
410 return -EFAULT;
411 val = (int) ucval;
412 }
413 }
414
415 /* If optlen==0, it is equivalent to val == 0 */
416
417 #ifdef CONFIG_IP_MROUTE
418 if (optname >= MRT_BASE && optname <= (MRT_BASE + 10))
419 return ip_mroute_setsockopt(sk,optname,optval,optlen);
420 #endif
421
422 err = 0;
423 lock_sock(sk);
424
425 switch (optname) {
426 case IP_OPTIONS:
427 {
428 struct ip_options * opt = NULL;
429 if (optlen > 40 || optlen < 0)
430 goto e_inval;
431 err = ip_options_get(&opt, optval, optlen, 1);
432 if (err)
433 break;
434 if (sk->sk_type == SOCK_STREAM) {
435 struct tcp_opt *tp = tcp_sk(sk);
436 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
437 if (sk->sk_family == PF_INET ||
438 (!((1 << sk->sk_state) &
439 (TCPF_LISTEN | TCPF_CLOSE)) &&
440 inet->daddr != LOOPBACK4_IPV6)) {
441 #endif
442 if (inet->opt)
443 tp->ext_header_len -= inet->opt->optlen;
444 if (opt)
445 tp->ext_header_len += opt->optlen;
446 tcp_sync_mss(sk, tp->pmtu_cookie);
447 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
448 }
449 #endif
450 }
451 opt = xchg(&inet->opt, opt);
452 if (opt)
453 kfree(opt);
454 break;
455 }
456 case IP_PKTINFO:
457 if (val)
458 inet->cmsg_flags |= IP_CMSG_PKTINFO;
459 else
460 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
461 break;
462 case IP_RECVTTL:
463 if (val)
464 inet->cmsg_flags |= IP_CMSG_TTL;
465 else
466 inet->cmsg_flags &= ~IP_CMSG_TTL;
467 break;
468 case IP_RECVTOS:
469 if (val)
470 inet->cmsg_flags |= IP_CMSG_TOS;
471 else
472 inet->cmsg_flags &= ~IP_CMSG_TOS;
473 break;
474 case IP_RECVOPTS:
475 if (val)
476 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
477 else
478 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
479 break;
480 case IP_RETOPTS:
481 if (val)
482 inet->cmsg_flags |= IP_CMSG_RETOPTS;
483 else
484 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
485 break;
486 case IP_TOS: /* This sets both TOS and Precedence */
487 if (sk->sk_type == SOCK_STREAM) {
488 val &= ~3;
489 val |= inet->tos & 3;
490 }
491 if (IPTOS_PREC(val) >= IPTOS_PREC_CRITIC_ECP &&
492 !capable(CAP_NET_ADMIN)) {
493 err = -EPERM;
494 break;
495 }
496 if (inet->tos != val) {
497 inet->tos = val;
498 sk->sk_priority = rt_tos2priority(val);
499 sk_dst_reset(sk);
500 }
501 break;
502 case IP_TTL:
503 if (optlen<1)
504 goto e_inval;
505 if (val != -1 && (val < 1 || val>255))
506 goto e_inval;
507 inet->uc_ttl = val;
508 break;
509 case IP_HDRINCL:
510 if (sk->sk_type != SOCK_RAW) {
511 err = -ENOPROTOOPT;
512 break;
513 }
514 inet->hdrincl = val ? 1 : 0;
515 break;
516 case IP_MTU_DISCOVER:
517 if (val<0 || val>2)
518 goto e_inval;
519 inet->pmtudisc = val;
520 break;
521 case IP_RECVERR:
522 inet->recverr = !!val;
523 if (!val)
524 skb_queue_purge(&sk->sk_error_queue);
525 break;
526 case IP_MULTICAST_TTL:
527 if (sk->sk_type == SOCK_STREAM)
528 goto e_inval;
529 if (optlen<1)
530 goto e_inval;
531 if (val==-1)
532 val = 1;
533 if (val < 0 || val > 255)
534 goto e_inval;
535 inet->mc_ttl = val;
536 break;
537 case IP_MULTICAST_LOOP:
538 if (optlen<1)
539 goto e_inval;
540 inet->mc_loop = !!val;
541 break;
542 case IP_MULTICAST_IF:
543 {
544 struct ip_mreqn mreq;
545 struct net_device *dev = NULL;
546
547 if (sk->sk_type == SOCK_STREAM)
548 goto e_inval;
549 /*
550 * Check the arguments are allowable
551 */
552
553 err = -EFAULT;
554 if (optlen >= sizeof(struct ip_mreqn)) {
555 if (copy_from_user(&mreq,optval,sizeof(mreq)))
556 break;
557 } else {
558 memset(&mreq, 0, sizeof(mreq));
559 if (optlen >= sizeof(struct in_addr) &&
560 copy_from_user(&mreq.imr_address,optval,sizeof(struct in_addr)))
561 break;
562 }
563
564 if (!mreq.imr_ifindex) {
565 if (mreq.imr_address.s_addr == INADDR_ANY) {
566 inet->mc_index = 0;
567 inet->mc_addr = 0;
568 err = 0;
569 break;
570 }
571 dev = ip_dev_find(mreq.imr_address.s_addr);
572 if (dev) {
573 mreq.imr_ifindex = dev->ifindex;
574 dev_put(dev);
575 }
576 } else
577 dev = __dev_get_by_index(mreq.imr_ifindex);
578
579
580 err = -EADDRNOTAVAIL;
581 if (!dev)
582 break;
583
584 err = -EINVAL;
585 if (sk->sk_bound_dev_if &&
586 mreq.imr_ifindex != sk->sk_bound_dev_if)
587 break;
588
589 inet->mc_index = mreq.imr_ifindex;
590 inet->mc_addr = mreq.imr_address.s_addr;
591 err = 0;
592 break;
593 }
594
595 case IP_ADD_MEMBERSHIP:
596 case IP_DROP_MEMBERSHIP:
597 {
598 struct ip_mreqn mreq;
599
600 if (optlen < sizeof(struct ip_mreq))
601 goto e_inval;
602 err = -EFAULT;
603 if (optlen >= sizeof(struct ip_mreqn)) {
604 if(copy_from_user(&mreq,optval,sizeof(mreq)))
605 break;
606 } else {
607 memset(&mreq, 0, sizeof(mreq));
608 if (copy_from_user(&mreq,optval,sizeof(struct ip_mreq)))
609 break;
610 }
611
612 if (optname == IP_ADD_MEMBERSHIP)
613 err = ip_mc_join_group(sk, &mreq);
614 else
615 err = ip_mc_leave_group(sk, &mreq);
616 break;
617 }
618 case IP_MSFILTER:
619 {
620 extern int sysctl_optmem_max;
621 extern int sysctl_igmp_max_msf;
622 struct ip_msfilter *msf;
623
624 if (optlen < IP_MSFILTER_SIZE(0))
625 goto e_inval;
626 if (optlen > sysctl_optmem_max) {
627 err = -ENOBUFS;
628 break;
629 }
630 msf = (struct ip_msfilter *)kmalloc(optlen, GFP_KERNEL);
631 if (msf == 0) {
632 err = -ENOBUFS;
633 break;
634 }
635 err = -EFAULT;
636 if (copy_from_user(msf, optval, optlen)) {
637 kfree(msf);
638 break;
639 }
640 /* numsrc >= (1G-4) overflow in 32 bits */
641 if (msf->imsf_numsrc >= 0x3ffffffcU ||
642 msf->imsf_numsrc > sysctl_igmp_max_msf) {
643 kfree(msf);
644 err = -ENOBUFS;
645 break;
646 }
647 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
648 kfree(msf);
649 err = -EINVAL;
650 break;
651 }
652 err = ip_mc_msfilter(sk, msf, 0);
653 kfree(msf);
654 break;
655 }
656 case IP_BLOCK_SOURCE:
657 case IP_UNBLOCK_SOURCE:
658 case IP_ADD_SOURCE_MEMBERSHIP:
659 case IP_DROP_SOURCE_MEMBERSHIP:
660 {
661 struct ip_mreq_source mreqs;
662 int omode, add;
663
664 if (optlen != sizeof(struct ip_mreq_source))
665 goto e_inval;
666 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
667 err = -EFAULT;
668 break;
669 }
670 if (optname == IP_BLOCK_SOURCE) {
671 omode = MCAST_EXCLUDE;
672 add = 1;
673 } else if (optname == IP_UNBLOCK_SOURCE) {
674 omode = MCAST_EXCLUDE;
675 add = 0;
676 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
677 struct ip_mreqn mreq;
678
679 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
680 mreq.imr_address.s_addr = mreqs.imr_interface;
681 mreq.imr_ifindex = 0;
682 err = ip_mc_join_group(sk, &mreq);
683 if (err)
684 break;
685 omode = MCAST_INCLUDE;
686 add = 1;
687 } else /*IP_DROP_SOURCE_MEMBERSHIP */ {
688 omode = MCAST_INCLUDE;
689 add = 0;
690 }
691 err = ip_mc_source(add, omode, sk, &mreqs, 0);
692 break;
693 }
694 case MCAST_JOIN_GROUP:
695 case MCAST_LEAVE_GROUP:
696 {
697 struct group_req greq;
698 struct sockaddr_in *psin;
699 struct ip_mreqn mreq;
700
701 if (optlen < sizeof(struct group_req))
702 goto e_inval;
703 err = -EFAULT;
704 if(copy_from_user(&greq, optval, sizeof(greq)))
705 break;
706 psin = (struct sockaddr_in *)&greq.gr_group;
707 if (psin->sin_family != AF_INET)
708 goto e_inval;
709 memset(&mreq, 0, sizeof(mreq));
710 mreq.imr_multiaddr = psin->sin_addr;
711 mreq.imr_ifindex = greq.gr_interface;
712
713 if (optname == MCAST_JOIN_GROUP)
714 err = ip_mc_join_group(sk, &mreq);
715 else
716 err = ip_mc_leave_group(sk, &mreq);
717 break;
718 }
719 case MCAST_JOIN_SOURCE_GROUP:
720 case MCAST_LEAVE_SOURCE_GROUP:
721 case MCAST_BLOCK_SOURCE:
722 case MCAST_UNBLOCK_SOURCE:
723 {
724 struct group_source_req greqs;
725 struct ip_mreq_source mreqs;
726 struct sockaddr_in *psin;
727 int omode, add;
728
729 if (optlen != sizeof(struct group_source_req))
730 goto e_inval;
731 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
732 err = -EFAULT;
733 break;
734 }
735 if (greqs.gsr_group.ss_family != AF_INET ||
736 greqs.gsr_source.ss_family != AF_INET) {
737 err = -EADDRNOTAVAIL;
738 break;
739 }
740 psin = (struct sockaddr_in *)&greqs.gsr_group;
741 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
742 psin = (struct sockaddr_in *)&greqs.gsr_source;
743 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
744 mreqs.imr_interface = 0; /* use index for mc_source */
745
746 if (optname == MCAST_BLOCK_SOURCE) {
747 omode = MCAST_EXCLUDE;
748 add = 1;
749 } else if (optname == MCAST_UNBLOCK_SOURCE) {
750 omode = MCAST_EXCLUDE;
751 add = 0;
752 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
753 struct ip_mreqn mreq;
754
755 psin = (struct sockaddr_in *)&greqs.gsr_group;
756 mreq.imr_multiaddr = psin->sin_addr;
757 mreq.imr_address.s_addr = 0;
758 mreq.imr_ifindex = greqs.gsr_interface;
759 err = ip_mc_join_group(sk, &mreq);
760 if (err)
761 break;
762 greqs.gsr_interface = mreq.imr_ifindex;
763 omode = MCAST_INCLUDE;
764 add = 1;
765 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
766 omode = MCAST_INCLUDE;
767 add = 0;
768 }
769 err = ip_mc_source(add, omode, sk, &mreqs,
770 greqs.gsr_interface);
771 break;
772 }
773 case MCAST_MSFILTER:
774 {
775 extern int sysctl_optmem_max;
776 extern int sysctl_igmp_max_msf;
777 struct sockaddr_in *psin;
778 struct ip_msfilter *msf = NULL;
779 struct group_filter *gsf = NULL;
780 int msize, i, ifindex;
781
782 if (optlen < GROUP_FILTER_SIZE(0))
783 goto e_inval;
784 if (optlen > sysctl_optmem_max) {
785 err = -ENOBUFS;
786 break;
787 }
788 gsf = (struct group_filter *)kmalloc(optlen,GFP_KERNEL);
789 if (gsf == 0) {
790 err = -ENOBUFS;
791 break;
792 }
793 err = -EFAULT;
794 if (copy_from_user(gsf, optval, optlen)) {
795 goto mc_msf_out;
796 }
797 /* numsrc >= (4G-140)/128 overflow in 32 bits */
798 if (gsf->gf_numsrc >= 0x1ffffff ||
799 gsf->gf_numsrc > sysctl_igmp_max_msf) {
800 err = -ENOBUFS;
801 goto mc_msf_out;
802 }
803 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
804 err = -EINVAL;
805 goto mc_msf_out;
806 }
807 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
808 msf = (struct ip_msfilter *)kmalloc(msize,GFP_KERNEL);
809 if (msf == 0) {
810 err = -ENOBUFS;
811 goto mc_msf_out;
812 }
813 ifindex = gsf->gf_interface;
814 psin = (struct sockaddr_in *)&gsf->gf_group;
815 if (psin->sin_family != AF_INET) {
816 err = -EADDRNOTAVAIL;
817 goto mc_msf_out;
818 }
819 msf->imsf_multiaddr = psin->sin_addr.s_addr;
820 msf->imsf_interface = 0;
821 msf->imsf_fmode = gsf->gf_fmode;
822 msf->imsf_numsrc = gsf->gf_numsrc;
823 err = -EADDRNOTAVAIL;
824 for (i=0; i<gsf->gf_numsrc; ++i) {
825 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
826
827 if (psin->sin_family != AF_INET)
828 goto mc_msf_out;
829 msf->imsf_slist[i] = psin->sin_addr.s_addr;
830 }
831 kfree(gsf);
832 gsf = NULL;
833
834 err = ip_mc_msfilter(sk, msf, ifindex);
835 mc_msf_out:
836 if (msf)
837 kfree(msf);
838 if (gsf)
839 kfree(gsf);
840 break;
841 }
842 case IP_ROUTER_ALERT:
843 err = ip_ra_control(sk, val ? 1 : 0, NULL);
844 break;
845
846 case IP_FREEBIND:
847 if (optlen<1)
848 goto e_inval;
849 inet->freebind = !!val;
850 break;
851
852 case IP_IPSEC_POLICY:
853 case IP_XFRM_POLICY:
854 err = xfrm_user_policy(sk, optname, optval, optlen);
855 break;
856
857 default:
858 #ifdef CONFIG_NETFILTER
859 err = nf_setsockopt(sk, PF_INET, optname, optval,
860 optlen);
861 #else
862 err = -ENOPROTOOPT;
863 #endif
864 break;
865 }
866 release_sock(sk);
867 return err;
868
869 e_inval:
870 release_sock(sk);
871 return -EINVAL;
872 }
873
874 /*
875 * Get the options. Note for future reference. The GET of IP options gets the
876 * _received_ ones. The set sets the _sent_ ones.
877 */
878
879 int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen)
880 {
881 struct inet_opt *inet = inet_sk(sk);
882 int val;
883 int len;
884
885 if(level!=SOL_IP)
886 return -EOPNOTSUPP;
887
888 #ifdef CONFIG_IP_MROUTE
889 if(optname>=MRT_BASE && optname <=MRT_BASE+10)
890 {
891 return ip_mroute_getsockopt(sk,optname,optval,optlen);
892 }
893 #endif
894
895 if(get_user(len,optlen))
896 return -EFAULT;
897 if(len < 0)
898 return -EINVAL;
899
900 lock_sock(sk);
901
902 switch(optname) {
903 case IP_OPTIONS:
904 {
905 unsigned char optbuf[sizeof(struct ip_options)+40];
906 struct ip_options * opt = (struct ip_options*)optbuf;
907 opt->optlen = 0;
908 if (inet->opt)
909 memcpy(optbuf, inet->opt,
910 sizeof(struct ip_options)+
911 inet->opt->optlen);
912 release_sock(sk);
913
914 if (opt->optlen == 0)
915 return put_user(0, optlen);
916
917 ip_options_undo(opt);
918
919 len = min_t(unsigned int, len, opt->optlen);
920 if(put_user(len, optlen))
921 return -EFAULT;
922 if(copy_to_user(optval, opt->__data, len))
923 return -EFAULT;
924 return 0;
925 }
926 case IP_PKTINFO:
927 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
928 break;
929 case IP_RECVTTL:
930 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
931 break;
932 case IP_RECVTOS:
933 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
934 break;
935 case IP_RECVOPTS:
936 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
937 break;
938 case IP_RETOPTS:
939 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
940 break;
941 case IP_TOS:
942 val = inet->tos;
943 break;
944 case IP_TTL:
945 val = (inet->uc_ttl == -1 ?
946 sysctl_ip_default_ttl :
947 inet->uc_ttl);
948 break;
949 case IP_HDRINCL:
950 val = inet->hdrincl;
951 break;
952 case IP_MTU_DISCOVER:
953 val = inet->pmtudisc;
954 break;
955 case IP_MTU:
956 {
957 struct dst_entry *dst;
958 val = 0;
959 dst = sk_dst_get(sk);
960 if (dst) {
961 val = dst_pmtu(dst) - dst->header_len;
962 dst_release(dst);
963 }
964 if (!val) {
965 release_sock(sk);
966 return -ENOTCONN;
967 }
968 break;
969 }
970 case IP_RECVERR:
971 val = inet->recverr;
972 break;
973 case IP_MULTICAST_TTL:
974 val = inet->mc_ttl;
975 break;
976 case IP_MULTICAST_LOOP:
977 val = inet->mc_loop;
978 break;
979 case IP_MULTICAST_IF:
980 {
981 struct in_addr addr;
982 len = min_t(unsigned int, len, sizeof(struct in_addr));
983 addr.s_addr = inet->mc_addr;
984 release_sock(sk);
985
986 if(put_user(len, optlen))
987 return -EFAULT;
988 if(copy_to_user(optval, &addr, len))
989 return -EFAULT;
990 return 0;
991 }
992 case IP_MSFILTER:
993 {
994 struct ip_msfilter msf;
995 int err;
996
997 if (len < IP_MSFILTER_SIZE(0)) {
998 release_sock(sk);
999 return -EINVAL;
1000 }
1001 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1002 release_sock(sk);
1003 return -EFAULT;
1004 }
1005 err = ip_mc_msfget(sk, &msf,
1006 (struct ip_msfilter __user *)optval, optlen);
1007 release_sock(sk);
1008 return err;
1009 }
1010 case MCAST_MSFILTER:
1011 {
1012 struct group_filter gsf;
1013 int err;
1014
1015 if (len < GROUP_FILTER_SIZE(0)) {
1016 release_sock(sk);
1017 return -EINVAL;
1018 }
1019 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1020 release_sock(sk);
1021 return -EFAULT;
1022 }
1023 err = ip_mc_gsfget(sk, &gsf,
1024 (struct group_filter __user *)optval, optlen);
1025 release_sock(sk);
1026 return err;
1027 }
1028 case IP_PKTOPTIONS:
1029 {
1030 struct msghdr msg;
1031
1032 release_sock(sk);
1033
1034 if (sk->sk_type != SOCK_STREAM)
1035 return -ENOPROTOOPT;
1036
1037 msg.msg_control = optval;
1038 msg.msg_controllen = len;
1039 msg.msg_flags = 0;
1040
1041 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1042 struct in_pktinfo info;
1043
1044 info.ipi_addr.s_addr = inet->rcv_saddr;
1045 info.ipi_spec_dst.s_addr = inet->rcv_saddr;
1046 info.ipi_ifindex = inet->mc_index;
1047 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1048 }
1049 if (inet->cmsg_flags & IP_CMSG_TTL) {
1050 int hlim = inet->mc_ttl;
1051 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1052 }
1053 len -= msg.msg_controllen;
1054 return put_user(len, optlen);
1055 }
1056 case IP_FREEBIND:
1057 val = inet->freebind;
1058 break;
1059 default:
1060 #ifdef CONFIG_NETFILTER
1061 val = nf_getsockopt(sk, PF_INET, optname, optval,
1062 &len);
1063 release_sock(sk);
1064 if (val >= 0)
1065 val = put_user(len, optlen);
1066 return val;
1067 #else
1068 release_sock(sk);
1069 return -ENOPROTOOPT;
1070 #endif
1071 }
1072 release_sock(sk);
1073
1074 if (len < sizeof(int) && len > 0 && val>=0 && val<255) {
1075 unsigned char ucval = (unsigned char)val;
1076 len = 1;
1077 if(put_user(len, optlen))
1078 return -EFAULT;
1079 if(copy_to_user(optval,&ucval,1))
1080 return -EFAULT;
1081 } else {
1082 len = min_t(unsigned int, sizeof(int), len);
1083 if(put_user(len, optlen))
1084 return -EFAULT;
1085 if(copy_to_user(optval,&val,len))
1086 return -EFAULT;
1087 }
1088 return 0;
1089 }
1090
1091 EXPORT_SYMBOL(ip_cmsg_recv);
1092
1093 #ifdef CONFIG_IP_SCTP_MODULE
1094 EXPORT_SYMBOL(ip_getsockopt);
1095 EXPORT_SYMBOL(ip_setsockopt);
1096 #endif
MOXA 2.6.9 from sdlinux-moxaart.tgz