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[PATCH] qconf: fix SIGSEGV on empty menu items
[linux-2.6/linux-loongson.git] / net / ipv4 / ip_sockglue.c
blob57d4bae6f080a470b277a28b505b6e11d015ebc4
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/sched.h>
24 #include <linux/skbuff.h>
25 #include <linux/ip.h>
26 #include <linux/icmp.h>
27 #include <linux/inetdevice.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_states.h>
33 #include <linux/udp.h>
34 #include <linux/igmp.h>
35 #include <linux/netfilter.h>
36 #include <linux/route.h>
37 #include <linux/mroute.h>
38 #include <net/route.h>
39 #include <net/xfrm.h>
40 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
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
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 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 = skb->h.icmph->type;
273 serr->ee.ee_code = skb->h.icmph->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*)(skb->h.icmph+1))->daddr) - skb->nh.raw;
278 serr->port = port;
279
280 skb->h.raw = payload;
281 if (!skb_pull(skb, payload - skb->data) ||
282 sock_queue_err_skb(sk, skb))
283 kfree_skb(skb);
284 }
285
286 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
287 {
288 struct inet_sock *inet = inet_sk(sk);
289 struct sock_exterr_skb *serr;
290 struct iphdr *iph;
291 struct sk_buff *skb;
292
293 if (!inet->recverr)
294 return;
295
296 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
297 if (!skb)
298 return;
299
300 iph = (struct iphdr*)skb_put(skb, sizeof(struct iphdr));
301 skb->nh.iph = iph;
302 iph->daddr = daddr;
303
304 serr = SKB_EXT_ERR(skb);
305 serr->ee.ee_errno = err;
306 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
307 serr->ee.ee_type = 0;
308 serr->ee.ee_code = 0;
309 serr->ee.ee_pad = 0;
310 serr->ee.ee_info = info;
311 serr->ee.ee_data = 0;
312 serr->addr_offset = (u8*)&iph->daddr - skb->nh.raw;
313 serr->port = port;
314
315 skb->h.raw = skb->tail;
316 __skb_pull(skb, skb->tail - skb->data);
317
318 if (sock_queue_err_skb(sk, skb))
319 kfree_skb(skb);
320 }
321
322 /*
323 * Handle MSG_ERRQUEUE
324 */
325 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len)
326 {
327 struct sock_exterr_skb *serr;
328 struct sk_buff *skb, *skb2;
329 struct sockaddr_in *sin;
330 struct {
331 struct sock_extended_err ee;
332 struct sockaddr_in offender;
333 } errhdr;
334 int err;
335 int copied;
336
337 err = -EAGAIN;
338 skb = skb_dequeue(&sk->sk_error_queue);
339 if (skb == NULL)
340 goto out;
341
342 copied = skb->len;
343 if (copied > len) {
344 msg->msg_flags |= MSG_TRUNC;
345 copied = len;
346 }
347 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
348 if (err)
349 goto out_free_skb;
350
351 sock_recv_timestamp(msg, sk, skb);
352
353 serr = SKB_EXT_ERR(skb);
354
355 sin = (struct sockaddr_in *)msg->msg_name;
356 if (sin) {
357 sin->sin_family = AF_INET;
358 sin->sin_addr.s_addr = *(__be32*)(skb->nh.raw + serr->addr_offset);
359 sin->sin_port = serr->port;
360 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
361 }
362
363 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
364 sin = &errhdr.offender;
365 sin->sin_family = AF_UNSPEC;
366 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
367 struct inet_sock *inet = inet_sk(sk);
368
369 sin->sin_family = AF_INET;
370 sin->sin_addr.s_addr = skb->nh.iph->saddr;
371 sin->sin_port = 0;
372 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
373 if (inet->cmsg_flags)
374 ip_cmsg_recv(msg, skb);
375 }
376
377 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
378
379 /* Now we could try to dump offended packet options */
380
381 msg->msg_flags |= MSG_ERRQUEUE;
382 err = copied;
383
384 /* Reset and regenerate socket error */
385 spin_lock_bh(&sk->sk_error_queue.lock);
386 sk->sk_err = 0;
387 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
388 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
389 spin_unlock_bh(&sk->sk_error_queue.lock);
390 sk->sk_error_report(sk);
391 } else
392 spin_unlock_bh(&sk->sk_error_queue.lock);
393
394 out_free_skb:
395 kfree_skb(skb);
396 out:
397 return err;
398 }
399
400
401 /*
402 * Socket option code for IP. This is the end of the line after any TCP,UDP etc options on
403 * an IP socket.
404 */
405
406 static int do_ip_setsockopt(struct sock *sk, int level,
407 int optname, char __user *optval, int optlen)
408 {
409 struct inet_sock *inet = inet_sk(sk);
410 int val=0,err;
411
412 if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) |
413 (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) |
414 (1<<IP_RETOPTS) | (1<<IP_TOS) |
415 (1<<IP_TTL) | (1<<IP_HDRINCL) |
416 (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) |
417 (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) |
418 (1<<IP_PASSSEC))) ||
419 optname == IP_MULTICAST_TTL ||
420 optname == IP_MULTICAST_LOOP) {
421 if (optlen >= sizeof(int)) {
422 if (get_user(val, (int __user *) optval))
423 return -EFAULT;
424 } else if (optlen >= sizeof(char)) {
425 unsigned char ucval;
426
427 if (get_user(ucval, (unsigned char __user *) optval))
428 return -EFAULT;
429 val = (int) ucval;
430 }
431 }
432
433 /* If optlen==0, it is equivalent to val == 0 */
434
435 #ifdef CONFIG_IP_MROUTE
436 if (optname >= MRT_BASE && optname <= (MRT_BASE + 10))
437 return ip_mroute_setsockopt(sk,optname,optval,optlen);
438 #endif
439
440 err = 0;
441 lock_sock(sk);
442
443 switch (optname) {
444 case IP_OPTIONS:
445 {
446 struct ip_options * opt = NULL;
447 if (optlen > 40 || optlen < 0)
448 goto e_inval;
449 err = ip_options_get_from_user(&opt, optval, optlen);
450 if (err)
451 break;
452 if (inet->is_icsk) {
453 struct inet_connection_sock *icsk = inet_csk(sk);
454 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
455 if (sk->sk_family == PF_INET ||
456 (!((1 << sk->sk_state) &
457 (TCPF_LISTEN | TCPF_CLOSE)) &&
458 inet->daddr != LOOPBACK4_IPV6)) {
459 #endif
460 if (inet->opt)
461 icsk->icsk_ext_hdr_len -= inet->opt->optlen;
462 if (opt)
463 icsk->icsk_ext_hdr_len += opt->optlen;
464 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
465 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
466 }
467 #endif
468 }
469 opt = xchg(&inet->opt, opt);
470 kfree(opt);
471 break;
472 }
473 case IP_PKTINFO:
474 if (val)
475 inet->cmsg_flags |= IP_CMSG_PKTINFO;
476 else
477 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
478 break;
479 case IP_RECVTTL:
480 if (val)
481 inet->cmsg_flags |= IP_CMSG_TTL;
482 else
483 inet->cmsg_flags &= ~IP_CMSG_TTL;
484 break;
485 case IP_RECVTOS:
486 if (val)
487 inet->cmsg_flags |= IP_CMSG_TOS;
488 else
489 inet->cmsg_flags &= ~IP_CMSG_TOS;
490 break;
491 case IP_RECVOPTS:
492 if (val)
493 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
494 else
495 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
496 break;
497 case IP_RETOPTS:
498 if (val)
499 inet->cmsg_flags |= IP_CMSG_RETOPTS;
500 else
501 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
502 break;
503 case IP_PASSSEC:
504 if (val)
505 inet->cmsg_flags |= IP_CMSG_PASSSEC;
506 else
507 inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
508 break;
509 case IP_TOS: /* This sets both TOS and Precedence */
510 if (sk->sk_type == SOCK_STREAM) {
511 val &= ~3;
512 val |= inet->tos & 3;
513 }
514 if (IPTOS_PREC(val) >= IPTOS_PREC_CRITIC_ECP &&
515 !capable(CAP_NET_ADMIN)) {
516 err = -EPERM;
517 break;
518 }
519 if (inet->tos != val) {
520 inet->tos = val;
521 sk->sk_priority = rt_tos2priority(val);
522 sk_dst_reset(sk);
523 }
524 break;
525 case IP_TTL:
526 if (optlen<1)
527 goto e_inval;
528 if (val != -1 && (val < 1 || val>255))
529 goto e_inval;
530 inet->uc_ttl = val;
531 break;
532 case IP_HDRINCL:
533 if (sk->sk_type != SOCK_RAW) {
534 err = -ENOPROTOOPT;
535 break;
536 }
537 inet->hdrincl = val ? 1 : 0;
538 break;
539 case IP_MTU_DISCOVER:
540 if (val<0 || val>2)
541 goto e_inval;
542 inet->pmtudisc = val;
543 break;
544 case IP_RECVERR:
545 inet->recverr = !!val;
546 if (!val)
547 skb_queue_purge(&sk->sk_error_queue);
548 break;
549 case IP_MULTICAST_TTL:
550 if (sk->sk_type == SOCK_STREAM)
551 goto e_inval;
552 if (optlen<1)
553 goto e_inval;
554 if (val==-1)
555 val = 1;
556 if (val < 0 || val > 255)
557 goto e_inval;
558 inet->mc_ttl = val;
559 break;
560 case IP_MULTICAST_LOOP:
561 if (optlen<1)
562 goto e_inval;
563 inet->mc_loop = !!val;
564 break;
565 case IP_MULTICAST_IF:
566 {
567 struct ip_mreqn mreq;
568 struct net_device *dev = NULL;
569
570 if (sk->sk_type == SOCK_STREAM)
571 goto e_inval;
572 /*
573 * Check the arguments are allowable
574 */
575
576 err = -EFAULT;
577 if (optlen >= sizeof(struct ip_mreqn)) {
578 if (copy_from_user(&mreq,optval,sizeof(mreq)))
579 break;
580 } else {
581 memset(&mreq, 0, sizeof(mreq));
582 if (optlen >= sizeof(struct in_addr) &&
583 copy_from_user(&mreq.imr_address,optval,sizeof(struct in_addr)))
584 break;
585 }
586
587 if (!mreq.imr_ifindex) {
588 if (mreq.imr_address.s_addr == INADDR_ANY) {
589 inet->mc_index = 0;
590 inet->mc_addr = 0;
591 err = 0;
592 break;
593 }
594 dev = ip_dev_find(mreq.imr_address.s_addr);
595 if (dev) {
596 mreq.imr_ifindex = dev->ifindex;
597 dev_put(dev);
598 }
599 } else
600 dev = __dev_get_by_index(mreq.imr_ifindex);
601
602
603 err = -EADDRNOTAVAIL;
604 if (!dev)
605 break;
606
607 err = -EINVAL;
608 if (sk->sk_bound_dev_if &&
609 mreq.imr_ifindex != sk->sk_bound_dev_if)
610 break;
611
612 inet->mc_index = mreq.imr_ifindex;
613 inet->mc_addr = mreq.imr_address.s_addr;
614 err = 0;
615 break;
616 }
617
618 case IP_ADD_MEMBERSHIP:
619 case IP_DROP_MEMBERSHIP:
620 {
621 struct ip_mreqn mreq;
622
623 if (optlen < sizeof(struct ip_mreq))
624 goto e_inval;
625 err = -EFAULT;
626 if (optlen >= sizeof(struct ip_mreqn)) {
627 if(copy_from_user(&mreq,optval,sizeof(mreq)))
628 break;
629 } else {
630 memset(&mreq, 0, sizeof(mreq));
631 if (copy_from_user(&mreq,optval,sizeof(struct ip_mreq)))
632 break;
633 }
634
635 if (optname == IP_ADD_MEMBERSHIP)
636 err = ip_mc_join_group(sk, &mreq);
637 else
638 err = ip_mc_leave_group(sk, &mreq);
639 break;
640 }
641 case IP_MSFILTER:
642 {
643 extern int sysctl_igmp_max_msf;
644 struct ip_msfilter *msf;
645
646 if (optlen < IP_MSFILTER_SIZE(0))
647 goto e_inval;
648 if (optlen > sysctl_optmem_max) {
649 err = -ENOBUFS;
650 break;
651 }
652 msf = kmalloc(optlen, GFP_KERNEL);
653 if (msf == 0) {
654 err = -ENOBUFS;
655 break;
656 }
657 err = -EFAULT;
658 if (copy_from_user(msf, optval, optlen)) {
659 kfree(msf);
660 break;
661 }
662 /* numsrc >= (1G-4) overflow in 32 bits */
663 if (msf->imsf_numsrc >= 0x3ffffffcU ||
664 msf->imsf_numsrc > sysctl_igmp_max_msf) {
665 kfree(msf);
666 err = -ENOBUFS;
667 break;
668 }
669 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
670 kfree(msf);
671 err = -EINVAL;
672 break;
673 }
674 err = ip_mc_msfilter(sk, msf, 0);
675 kfree(msf);
676 break;
677 }
678 case IP_BLOCK_SOURCE:
679 case IP_UNBLOCK_SOURCE:
680 case IP_ADD_SOURCE_MEMBERSHIP:
681 case IP_DROP_SOURCE_MEMBERSHIP:
682 {
683 struct ip_mreq_source mreqs;
684 int omode, add;
685
686 if (optlen != sizeof(struct ip_mreq_source))
687 goto e_inval;
688 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
689 err = -EFAULT;
690 break;
691 }
692 if (optname == IP_BLOCK_SOURCE) {
693 omode = MCAST_EXCLUDE;
694 add = 1;
695 } else if (optname == IP_UNBLOCK_SOURCE) {
696 omode = MCAST_EXCLUDE;
697 add = 0;
698 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
699 struct ip_mreqn mreq;
700
701 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
702 mreq.imr_address.s_addr = mreqs.imr_interface;
703 mreq.imr_ifindex = 0;
704 err = ip_mc_join_group(sk, &mreq);
705 if (err && err != -EADDRINUSE)
706 break;
707 omode = MCAST_INCLUDE;
708 add = 1;
709 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
710 omode = MCAST_INCLUDE;
711 add = 0;
712 }
713 err = ip_mc_source(add, omode, sk, &mreqs, 0);
714 break;
715 }
716 case MCAST_JOIN_GROUP:
717 case MCAST_LEAVE_GROUP:
718 {
719 struct group_req greq;
720 struct sockaddr_in *psin;
721 struct ip_mreqn mreq;
722
723 if (optlen < sizeof(struct group_req))
724 goto e_inval;
725 err = -EFAULT;
726 if(copy_from_user(&greq, optval, sizeof(greq)))
727 break;
728 psin = (struct sockaddr_in *)&greq.gr_group;
729 if (psin->sin_family != AF_INET)
730 goto e_inval;
731 memset(&mreq, 0, sizeof(mreq));
732 mreq.imr_multiaddr = psin->sin_addr;
733 mreq.imr_ifindex = greq.gr_interface;
734
735 if (optname == MCAST_JOIN_GROUP)
736 err = ip_mc_join_group(sk, &mreq);
737 else
738 err = ip_mc_leave_group(sk, &mreq);
739 break;
740 }
741 case MCAST_JOIN_SOURCE_GROUP:
742 case MCAST_LEAVE_SOURCE_GROUP:
743 case MCAST_BLOCK_SOURCE:
744 case MCAST_UNBLOCK_SOURCE:
745 {
746 struct group_source_req greqs;
747 struct ip_mreq_source mreqs;
748 struct sockaddr_in *psin;
749 int omode, add;
750
751 if (optlen != sizeof(struct group_source_req))
752 goto e_inval;
753 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
754 err = -EFAULT;
755 break;
756 }
757 if (greqs.gsr_group.ss_family != AF_INET ||
758 greqs.gsr_source.ss_family != AF_INET) {
759 err = -EADDRNOTAVAIL;
760 break;
761 }
762 psin = (struct sockaddr_in *)&greqs.gsr_group;
763 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
764 psin = (struct sockaddr_in *)&greqs.gsr_source;
765 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
766 mreqs.imr_interface = 0; /* use index for mc_source */
767
768 if (optname == MCAST_BLOCK_SOURCE) {
769 omode = MCAST_EXCLUDE;
770 add = 1;
771 } else if (optname == MCAST_UNBLOCK_SOURCE) {
772 omode = MCAST_EXCLUDE;
773 add = 0;
774 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
775 struct ip_mreqn mreq;
776
777 psin = (struct sockaddr_in *)&greqs.gsr_group;
778 mreq.imr_multiaddr = psin->sin_addr;
779 mreq.imr_address.s_addr = 0;
780 mreq.imr_ifindex = greqs.gsr_interface;
781 err = ip_mc_join_group(sk, &mreq);
782 if (err && err != -EADDRINUSE)
783 break;
784 greqs.gsr_interface = mreq.imr_ifindex;
785 omode = MCAST_INCLUDE;
786 add = 1;
787 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
788 omode = MCAST_INCLUDE;
789 add = 0;
790 }
791 err = ip_mc_source(add, omode, sk, &mreqs,
792 greqs.gsr_interface);
793 break;
794 }
795 case MCAST_MSFILTER:
796 {
797 extern int sysctl_igmp_max_msf;
798 struct sockaddr_in *psin;
799 struct ip_msfilter *msf = NULL;
800 struct group_filter *gsf = NULL;
801 int msize, i, ifindex;
802
803 if (optlen < GROUP_FILTER_SIZE(0))
804 goto e_inval;
805 if (optlen > sysctl_optmem_max) {
806 err = -ENOBUFS;
807 break;
808 }
809 gsf = kmalloc(optlen,GFP_KERNEL);
810 if (gsf == 0) {
811 err = -ENOBUFS;
812 break;
813 }
814 err = -EFAULT;
815 if (copy_from_user(gsf, optval, optlen)) {
816 goto mc_msf_out;
817 }
818 /* numsrc >= (4G-140)/128 overflow in 32 bits */
819 if (gsf->gf_numsrc >= 0x1ffffff ||
820 gsf->gf_numsrc > sysctl_igmp_max_msf) {
821 err = -ENOBUFS;
822 goto mc_msf_out;
823 }
824 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
825 err = -EINVAL;
826 goto mc_msf_out;
827 }
828 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
829 msf = kmalloc(msize,GFP_KERNEL);
830 if (msf == 0) {
831 err = -ENOBUFS;
832 goto mc_msf_out;
833 }
834 ifindex = gsf->gf_interface;
835 psin = (struct sockaddr_in *)&gsf->gf_group;
836 if (psin->sin_family != AF_INET) {
837 err = -EADDRNOTAVAIL;
838 goto mc_msf_out;
839 }
840 msf->imsf_multiaddr = psin->sin_addr.s_addr;
841 msf->imsf_interface = 0;
842 msf->imsf_fmode = gsf->gf_fmode;
843 msf->imsf_numsrc = gsf->gf_numsrc;
844 err = -EADDRNOTAVAIL;
845 for (i=0; i<gsf->gf_numsrc; ++i) {
846 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
847
848 if (psin->sin_family != AF_INET)
849 goto mc_msf_out;
850 msf->imsf_slist[i] = psin->sin_addr.s_addr;
851 }
852 kfree(gsf);
853 gsf = NULL;
854
855 err = ip_mc_msfilter(sk, msf, ifindex);
856 mc_msf_out:
857 kfree(msf);
858 kfree(gsf);
859 break;
860 }
861 case IP_ROUTER_ALERT:
862 err = ip_ra_control(sk, val ? 1 : 0, NULL);
863 break;
864
865 case IP_FREEBIND:
866 if (optlen<1)
867 goto e_inval;
868 inet->freebind = !!val;
869 break;
870
871 case IP_IPSEC_POLICY:
872 case IP_XFRM_POLICY:
873 err = -EPERM;
874 if (!capable(CAP_NET_ADMIN))
875 break;
876 err = xfrm_user_policy(sk, optname, optval, optlen);
877 break;
878
879 default:
880 err = -ENOPROTOOPT;
881 break;
882 }
883 release_sock(sk);
884 return err;
885
886 e_inval:
887 release_sock(sk);
888 return -EINVAL;
889 }
890
891 int ip_setsockopt(struct sock *sk, int level,
892 int optname, char __user *optval, int optlen)
893 {
894 int err;
895
896 if (level != SOL_IP)
897 return -ENOPROTOOPT;
898
899 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
900 #ifdef CONFIG_NETFILTER
901 /* we need to exclude all possible ENOPROTOOPTs except default case */
902 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
903 optname != IP_IPSEC_POLICY && optname != IP_XFRM_POLICY
904 #ifdef CONFIG_IP_MROUTE
905 && (optname < MRT_BASE || optname > (MRT_BASE + 10))
906 #endif
907 ) {
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 && optname != IP_XFRM_POLICY
930 #ifdef CONFIG_IP_MROUTE
931 && (optname < MRT_BASE || optname > (MRT_BASE + 10))
932 #endif
933 ) {
934 lock_sock(sk);
935 err = compat_nf_setsockopt(sk, PF_INET, optname,
936 optval, optlen);
937 release_sock(sk);
938 }
939 #endif
940 return err;
941 }
942
943 EXPORT_SYMBOL(compat_ip_setsockopt);
944 #endif
945
946 /*
947 * Get the options. Note for future reference. The GET of IP options gets the
948 * _received_ ones. The set sets the _sent_ ones.
949 */
950
951 static int do_ip_getsockopt(struct sock *sk, int level, int optname,
952 char __user *optval, int __user *optlen)
953 {
954 struct inet_sock *inet = inet_sk(sk);
955 int val;
956 int len;
957
958 if(level!=SOL_IP)
959 return -EOPNOTSUPP;
960
961 #ifdef CONFIG_IP_MROUTE
962 if(optname>=MRT_BASE && optname <=MRT_BASE+10)
963 {
964 return ip_mroute_getsockopt(sk,optname,optval,optlen);
965 }
966 #endif
967
968 if(get_user(len,optlen))
969 return -EFAULT;
970 if(len < 0)
971 return -EINVAL;
972
973 lock_sock(sk);
974
975 switch(optname) {
976 case IP_OPTIONS:
977 {
978 unsigned char optbuf[sizeof(struct ip_options)+40];
979 struct ip_options * opt = (struct ip_options*)optbuf;
980 opt->optlen = 0;
981 if (inet->opt)
982 memcpy(optbuf, inet->opt,
983 sizeof(struct ip_options)+
984 inet->opt->optlen);
985 release_sock(sk);
986
987 if (opt->optlen == 0)
988 return put_user(0, optlen);
989
990 ip_options_undo(opt);
991
992 len = min_t(unsigned int, len, opt->optlen);
993 if(put_user(len, optlen))
994 return -EFAULT;
995 if(copy_to_user(optval, opt->__data, len))
996 return -EFAULT;
997 return 0;
998 }
999 case IP_PKTINFO:
1000 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
1001 break;
1002 case IP_RECVTTL:
1003 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1004 break;
1005 case IP_RECVTOS:
1006 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1007 break;
1008 case IP_RECVOPTS:
1009 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1010 break;
1011 case IP_RETOPTS:
1012 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1013 break;
1014 case IP_PASSSEC:
1015 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1016 break;
1017 case IP_TOS:
1018 val = inet->tos;
1019 break;
1020 case IP_TTL:
1021 val = (inet->uc_ttl == -1 ?
1022 sysctl_ip_default_ttl :
1023 inet->uc_ttl);
1024 break;
1025 case IP_HDRINCL:
1026 val = inet->hdrincl;
1027 break;
1028 case IP_MTU_DISCOVER:
1029 val = inet->pmtudisc;
1030 break;
1031 case IP_MTU:
1032 {
1033 struct dst_entry *dst;
1034 val = 0;
1035 dst = sk_dst_get(sk);
1036 if (dst) {
1037 val = dst_mtu(dst);
1038 dst_release(dst);
1039 }
1040 if (!val) {
1041 release_sock(sk);
1042 return -ENOTCONN;
1043 }
1044 break;
1045 }
1046 case IP_RECVERR:
1047 val = inet->recverr;
1048 break;
1049 case IP_MULTICAST_TTL:
1050 val = inet->mc_ttl;
1051 break;
1052 case IP_MULTICAST_LOOP:
1053 val = inet->mc_loop;
1054 break;
1055 case IP_MULTICAST_IF:
1056 {
1057 struct in_addr addr;
1058 len = min_t(unsigned int, len, sizeof(struct in_addr));
1059 addr.s_addr = inet->mc_addr;
1060 release_sock(sk);
1061
1062 if(put_user(len, optlen))
1063 return -EFAULT;
1064 if(copy_to_user(optval, &addr, len))
1065 return -EFAULT;
1066 return 0;
1067 }
1068 case IP_MSFILTER:
1069 {
1070 struct ip_msfilter msf;
1071 int err;
1072
1073 if (len < IP_MSFILTER_SIZE(0)) {
1074 release_sock(sk);
1075 return -EINVAL;
1076 }
1077 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1078 release_sock(sk);
1079 return -EFAULT;
1080 }
1081 err = ip_mc_msfget(sk, &msf,
1082 (struct ip_msfilter __user *)optval, optlen);
1083 release_sock(sk);
1084 return err;
1085 }
1086 case MCAST_MSFILTER:
1087 {
1088 struct group_filter gsf;
1089 int err;
1090
1091 if (len < GROUP_FILTER_SIZE(0)) {
1092 release_sock(sk);
1093 return -EINVAL;
1094 }
1095 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1096 release_sock(sk);
1097 return -EFAULT;
1098 }
1099 err = ip_mc_gsfget(sk, &gsf,
1100 (struct group_filter __user *)optval, optlen);
1101 release_sock(sk);
1102 return err;
1103 }
1104 case IP_PKTOPTIONS:
1105 {
1106 struct msghdr msg;
1107
1108 release_sock(sk);
1109
1110 if (sk->sk_type != SOCK_STREAM)
1111 return -ENOPROTOOPT;
1112
1113 msg.msg_control = optval;
1114 msg.msg_controllen = len;
1115 msg.msg_flags = 0;
1116
1117 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1118 struct in_pktinfo info;
1119
1120 info.ipi_addr.s_addr = inet->rcv_saddr;
1121 info.ipi_spec_dst.s_addr = inet->rcv_saddr;
1122 info.ipi_ifindex = inet->mc_index;
1123 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1124 }
1125 if (inet->cmsg_flags & IP_CMSG_TTL) {
1126 int hlim = inet->mc_ttl;
1127 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1128 }
1129 len -= msg.msg_controllen;
1130 return put_user(len, optlen);
1131 }
1132 case IP_FREEBIND:
1133 val = inet->freebind;
1134 break;
1135 default:
1136 release_sock(sk);
1137 return -ENOPROTOOPT;
1138 }
1139 release_sock(sk);
1140
1141 if (len < sizeof(int) && len > 0 && val>=0 && val<255) {
1142 unsigned char ucval = (unsigned char)val;
1143 len = 1;
1144 if(put_user(len, optlen))
1145 return -EFAULT;
1146 if(copy_to_user(optval,&ucval,1))
1147 return -EFAULT;
1148 } else {
1149 len = min_t(unsigned int, sizeof(int), len);
1150 if(put_user(len, optlen))
1151 return -EFAULT;
1152 if(copy_to_user(optval,&val,len))
1153 return -EFAULT;
1154 }
1155 return 0;
1156 }
1157
1158 int ip_getsockopt(struct sock *sk, int level,
1159 int optname, char __user *optval, int __user *optlen)
1160 {
1161 int err;
1162
1163 err = do_ip_getsockopt(sk, level, optname, optval, optlen);
1164 #ifdef CONFIG_NETFILTER
1165 /* we need to exclude all possible ENOPROTOOPTs except default case */
1166 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS
1167 #ifdef CONFIG_IP_MROUTE
1168 && (optname < MRT_BASE || optname > MRT_BASE+10)
1169 #endif
1170 ) {
1171 int len;
1172
1173 if(get_user(len,optlen))
1174 return -EFAULT;
1175
1176 lock_sock(sk);
1177 err = nf_getsockopt(sk, PF_INET, optname, optval,
1178 &len);
1179 release_sock(sk);
1180 if (err >= 0)
1181 err = put_user(len, optlen);
1182 return err;
1183 }
1184 #endif
1185 return err;
1186 }
1187
1188 #ifdef CONFIG_COMPAT
1189 int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1190 char __user *optval, int __user *optlen)
1191 {
1192 int err = do_ip_getsockopt(sk, level, optname, optval, optlen);
1193 #ifdef CONFIG_NETFILTER
1194 /* we need to exclude all possible ENOPROTOOPTs except default case */
1195 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS
1196 #ifdef CONFIG_IP_MROUTE
1197 && (optname < MRT_BASE || optname > MRT_BASE+10)
1198 #endif
1199 ) {
1200 int len;
1201
1202 if (get_user(len, optlen))
1203 return -EFAULT;
1204
1205 lock_sock(sk);
1206 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
1207 release_sock(sk);
1208 if (err >= 0)
1209 err = put_user(len, optlen);
1210 return err;
1211 }
1212 #endif
1213 return err;
1214 }
1215
1216 EXPORT_SYMBOL(compat_ip_getsockopt);
1217 #endif
1218
1219 EXPORT_SYMBOL(ip_cmsg_recv);
1220
1221 EXPORT_SYMBOL(ip_getsockopt);
1222 EXPORT_SYMBOL(ip_setsockopt);
linux kernel for loongson