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Merge with Linux 2.5.48.
[linux-2.6/linux-mips.git] / net / ipv4 / ip_sockglue.c
blob0eadd005f4f39f30b786a649fe5a3ec58e4d309c
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/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/netdevice.h>
28 #include <net/sock.h>
29 #include <net/ip.h>
30 #include <net/icmp.h>
31 #include <net/tcp.h>
32 #include <linux/tcp.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
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 = skb->nh.iph->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 = skb->nh.iph->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, &skb->nh.iph->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, skb->nh.iph+1);
91 }
92
93
94 void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb)
95 {
96 unsigned char optbuf[sizeof(struct ip_options) + 40];
97 struct ip_options * opt = (struct ip_options*)optbuf;
98
99 if (IPCB(skb)->opt.optlen == 0)
100 return;
101
102 if (ip_options_echo(opt, skb)) {
103 msg->msg_flags |= MSG_CTRUNC;
104 return;
105 }
106 ip_options_undo(opt);
107
108 put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data);
109 }
110
111
112 void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
113 {
114 struct inet_opt *inet = inet_sk(skb->sk);
115 unsigned flags = inet->cmsg_flags;
116
117 /* Ordered by supposed usage frequency */
118 if (flags & 1)
119 ip_cmsg_recv_pktinfo(msg, skb);
120 if ((flags>>=1) == 0)
121 return;
122
123 if (flags & 1)
124 ip_cmsg_recv_ttl(msg, skb);
125 if ((flags>>=1) == 0)
126 return;
127
128 if (flags & 1)
129 ip_cmsg_recv_tos(msg, skb);
130 if ((flags>>=1) == 0)
131 return;
132
133 if (flags & 1)
134 ip_cmsg_recv_opts(msg, skb);
135 if ((flags>>=1) == 0)
136 return;
137
138 if (flags & 1)
139 ip_cmsg_recv_retopts(msg, skb);
140 }
141
142 int ip_cmsg_send(struct msghdr *msg, struct ipcm_cookie *ipc)
143 {
144 int err;
145 struct cmsghdr *cmsg;
146
147 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
148 if (cmsg->cmsg_len < sizeof(struct cmsghdr) ||
149 (unsigned long)(((char*)cmsg - (char*)msg->msg_control)
150 + cmsg->cmsg_len) > msg->msg_controllen) {
151 return -EINVAL;
152 }
153 if (cmsg->cmsg_level != SOL_IP)
154 continue;
155 switch (cmsg->cmsg_type) {
156 case IP_RETOPTS:
157 err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
158 err = ip_options_get(&ipc->opt, CMSG_DATA(cmsg), err < 40 ? err : 40, 0);
159 if (err)
160 return err;
161 break;
162 case IP_PKTINFO:
163 {
164 struct in_pktinfo *info;
165 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
166 return -EINVAL;
167 info = (struct in_pktinfo *)CMSG_DATA(cmsg);
168 ipc->oif = info->ipi_ifindex;
169 ipc->addr = info->ipi_spec_dst.s_addr;
170 break;
171 }
172 default:
173 return -EINVAL;
174 }
175 }
176 return 0;
177 }
178
179
180 /* Special input handler for packets catched by router alert option.
181 They are selected only by protocol field, and then processed likely
182 local ones; but only if someone wants them! Otherwise, router
183 not running rsvpd will kill RSVP.
184
185 It is user level problem, what it will make with them.
186 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
187 but receiver should be enough clever f.e. to forward mtrace requests,
188 sent to multicast group to reach destination designated router.
189 */
190 struct ip_ra_chain *ip_ra_chain;
191 rwlock_t ip_ra_lock = RW_LOCK_UNLOCKED;
192
193 int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *))
194 {
195 struct ip_ra_chain *ra, *new_ra, **rap;
196
197 if (sk->type != SOCK_RAW || inet_sk(sk)->num == IPPROTO_RAW)
198 return -EINVAL;
199
200 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
201
202 write_lock_bh(&ip_ra_lock);
203 for (rap = &ip_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
204 if (ra->sk == sk) {
205 if (on) {
206 write_unlock_bh(&ip_ra_lock);
207 if (new_ra)
208 kfree(new_ra);
209 return -EADDRINUSE;
210 }
211 *rap = ra->next;
212 write_unlock_bh(&ip_ra_lock);
213
214 if (ra->destructor)
215 ra->destructor(sk);
216 sock_put(sk);
217 kfree(ra);
218 return 0;
219 }
220 }
221 if (new_ra == NULL) {
222 write_unlock_bh(&ip_ra_lock);
223 return -ENOBUFS;
224 }
225 new_ra->sk = sk;
226 new_ra->destructor = destructor;
227
228 new_ra->next = ra;
229 *rap = new_ra;
230 sock_hold(sk);
231 write_unlock_bh(&ip_ra_lock);
232
233 return 0;
234 }
235
236 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
237 u16 port, u32 info, u8 *payload)
238 {
239 struct inet_opt *inet = inet_sk(sk);
240 struct sock_exterr_skb *serr;
241
242 if (!inet->recverr)
243 return;
244
245 skb = skb_clone(skb, GFP_ATOMIC);
246 if (!skb)
247 return;
248
249 serr = SKB_EXT_ERR(skb);
250 serr->ee.ee_errno = err;
251 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
252 serr->ee.ee_type = skb->h.icmph->type;
253 serr->ee.ee_code = skb->h.icmph->code;
254 serr->ee.ee_pad = 0;
255 serr->ee.ee_info = info;
256 serr->ee.ee_data = 0;
257 serr->addr_offset = (u8*)&(((struct iphdr*)(skb->h.icmph+1))->daddr) - skb->nh.raw;
258 serr->port = port;
259
260 skb->h.raw = payload;
261 if (!skb_pull(skb, payload - skb->data) ||
262 sock_queue_err_skb(sk, skb))
263 kfree_skb(skb);
264 }
265
266 void ip_local_error(struct sock *sk, int err, u32 daddr, u16 port, u32 info)
267 {
268 struct inet_opt *inet = inet_sk(sk);
269 struct sock_exterr_skb *serr;
270 struct iphdr *iph;
271 struct sk_buff *skb;
272
273 if (!inet->recverr)
274 return;
275
276 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
277 if (!skb)
278 return;
279
280 iph = (struct iphdr*)skb_put(skb, sizeof(struct iphdr));
281 skb->nh.iph = iph;
282 iph->daddr = daddr;
283
284 serr = SKB_EXT_ERR(skb);
285 serr->ee.ee_errno = err;
286 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
287 serr->ee.ee_type = 0;
288 serr->ee.ee_code = 0;
289 serr->ee.ee_pad = 0;
290 serr->ee.ee_info = info;
291 serr->ee.ee_data = 0;
292 serr->addr_offset = (u8*)&iph->daddr - skb->nh.raw;
293 serr->port = port;
294
295 skb->h.raw = skb->tail;
296 __skb_pull(skb, skb->tail - skb->data);
297
298 if (sock_queue_err_skb(sk, skb))
299 kfree_skb(skb);
300 }
301
302 /*
303 * Handle MSG_ERRQUEUE
304 */
305 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len)
306 {
307 struct sock_exterr_skb *serr;
308 struct sk_buff *skb, *skb2;
309 struct sockaddr_in *sin;
310 struct {
311 struct sock_extended_err ee;
312 struct sockaddr_in offender;
313 } errhdr;
314 int err;
315 int copied;
316
317 err = -EAGAIN;
318 skb = skb_dequeue(&sk->error_queue);
319 if (skb == NULL)
320 goto out;
321
322 copied = skb->len;
323 if (copied > len) {
324 msg->msg_flags |= MSG_TRUNC;
325 copied = len;
326 }
327 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
328 if (err)
329 goto out_free_skb;
330
331 sock_recv_timestamp(msg, sk, skb);
332
333 serr = SKB_EXT_ERR(skb);
334
335 sin = (struct sockaddr_in *)msg->msg_name;
336 if (sin) {
337 sin->sin_family = AF_INET;
338 sin->sin_addr.s_addr = *(u32*)(skb->nh.raw + serr->addr_offset);
339 sin->sin_port = serr->port;
340 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
341 }
342
343 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
344 sin = &errhdr.offender;
345 sin->sin_family = AF_UNSPEC;
346 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
347 struct inet_opt *inet = inet_sk(sk);
348
349 sin->sin_family = AF_INET;
350 sin->sin_addr.s_addr = skb->nh.iph->saddr;
351 sin->sin_port = 0;
352 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
353 if (inet->cmsg_flags)
354 ip_cmsg_recv(msg, skb);
355 }
356
357 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
358
359 /* Now we could try to dump offended packet options */
360
361 msg->msg_flags |= MSG_ERRQUEUE;
362 err = copied;
363
364 /* Reset and regenerate socket error */
365 spin_lock_irq(&sk->error_queue.lock);
366 sk->err = 0;
367 if ((skb2 = skb_peek(&sk->error_queue)) != NULL) {
368 sk->err = SKB_EXT_ERR(skb2)->ee.ee_errno;
369 spin_unlock_irq(&sk->error_queue.lock);
370 sk->error_report(sk);
371 } else {
372 spin_unlock_irq(&sk->error_queue.lock);
373 }
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 *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 *) optval))
405 return -EFAULT;
406 } else if (optlen >= sizeof(char)) {
407 unsigned char ucval;
408
409 if (get_user(ucval, (unsigned char *) 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->type == SOCK_STREAM) {
435 struct tcp_opt *tp = tcp_sk(sk);
436 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
437 if (sk->family == PF_INET ||
438 (!((1<<sk->state)&(TCPF_LISTEN|TCPF_CLOSE))
439 && inet->daddr != LOOPBACK4_IPV6)) {
440 #endif
441 if (inet->opt)
442 tp->ext_header_len -= inet->opt->optlen;
443 if (opt)
444 tp->ext_header_len += opt->optlen;
445 tcp_sync_mss(sk, tp->pmtu_cookie);
446 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
447 }
448 #endif
449 }
450 opt = xchg(&inet->opt, opt);
451 if (opt)
452 kfree(opt);
453 break;
454 }
455 case IP_PKTINFO:
456 if (val)
457 inet->cmsg_flags |= IP_CMSG_PKTINFO;
458 else
459 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
460 break;
461 case IP_RECVTTL:
462 if (val)
463 inet->cmsg_flags |= IP_CMSG_TTL;
464 else
465 inet->cmsg_flags &= ~IP_CMSG_TTL;
466 break;
467 case IP_RECVTOS:
468 if (val)
469 inet->cmsg_flags |= IP_CMSG_TOS;
470 else
471 inet->cmsg_flags &= ~IP_CMSG_TOS;
472 break;
473 case IP_RECVOPTS:
474 if (val)
475 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
476 else
477 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
478 break;
479 case IP_RETOPTS:
480 if (val)
481 inet->cmsg_flags |= IP_CMSG_RETOPTS;
482 else
483 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
484 break;
485 case IP_TOS: /* This sets both TOS and Precedence */
486 if (sk->type == SOCK_STREAM) {
487 val &= ~3;
488 val |= inet->tos & 3;
489 }
490 if (IPTOS_PREC(val) >= IPTOS_PREC_CRITIC_ECP &&
491 !capable(CAP_NET_ADMIN)) {
492 err = -EPERM;
493 break;
494 }
495 if (inet->tos != val) {
496 inet->tos = val;
497 sk->priority = rt_tos2priority(val);
498 sk_dst_reset(sk);
499 }
500 break;
501 case IP_TTL:
502 if (optlen<1)
503 goto e_inval;
504 if(val==-1)
505 val = sysctl_ip_default_ttl;
506 if(val<1||val>255)
507 goto e_inval;
508 inet->ttl = val;
509 break;
510 case IP_HDRINCL:
511 if(sk->type!=SOCK_RAW) {
512 err = -ENOPROTOOPT;
513 break;
514 }
515 inet->hdrincl = val ? 1 : 0;
516 break;
517 case IP_MTU_DISCOVER:
518 if (val<0 || val>2)
519 goto e_inval;
520 inet->pmtudisc = val;
521 break;
522 case IP_RECVERR:
523 inet->recverr = !!val;
524 if (!val)
525 skb_queue_purge(&sk->error_queue);
526 break;
527 case IP_MULTICAST_TTL:
528 if (sk->type == SOCK_STREAM)
529 goto e_inval;
530 if (optlen<1)
531 goto e_inval;
532 if (val==-1)
533 val = 1;
534 if (val < 0 || val > 255)
535 goto e_inval;
536 inet->mc_ttl = val;
537 break;
538 case IP_MULTICAST_LOOP:
539 if (optlen<1)
540 goto e_inval;
541 inet->mc_loop = !!val;
542 break;
543 case IP_MULTICAST_IF:
544 {
545 struct ip_mreqn mreq;
546 struct net_device *dev = NULL;
547
548 if (sk->type == SOCK_STREAM)
549 goto e_inval;
550 /*
551 * Check the arguments are allowable
552 */
553
554 err = -EFAULT;
555 if (optlen >= sizeof(struct ip_mreqn)) {
556 if (copy_from_user(&mreq,optval,sizeof(mreq)))
557 break;
558 } else {
559 memset(&mreq, 0, sizeof(mreq));
560 if (optlen >= sizeof(struct in_addr) &&
561 copy_from_user(&mreq.imr_address,optval,sizeof(struct in_addr)))
562 break;
563 }
564
565 if (!mreq.imr_ifindex) {
566 if (mreq.imr_address.s_addr == INADDR_ANY) {
567 inet->mc_index = 0;
568 inet->mc_addr = 0;
569 err = 0;
570 break;
571 }
572 dev = ip_dev_find(mreq.imr_address.s_addr);
573 if (dev) {
574 mreq.imr_ifindex = dev->ifindex;
575 dev_put(dev);
576 }
577 } else
578 dev = __dev_get_by_index(mreq.imr_ifindex);
579
580
581 err = -EADDRNOTAVAIL;
582 if (!dev)
583 break;
584
585 err = -EINVAL;
586 if (sk->bound_dev_if && mreq.imr_ifindex != 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_ROUTER_ALERT:
619 err = ip_ra_control(sk, val ? 1 : 0, NULL);
620 break;
621
622 case IP_FREEBIND:
623 if (optlen<1)
624 goto e_inval;
625 inet->freebind = !!val;
626 break;
627
628 case IP_IPSEC_POLICY:
629 case IP_XFRM_POLICY:
630 err = xfrm_user_policy(sk, optname, optval, optlen);
631 break;
632
633 default:
634 #ifdef CONFIG_NETFILTER
635 err = nf_setsockopt(sk, PF_INET, optname, optval,
636 optlen);
637 #else
638 err = -ENOPROTOOPT;
639 #endif
640 break;
641 }
642 release_sock(sk);
643 return err;
644
645 e_inval:
646 release_sock(sk);
647 return -EINVAL;
648 }
649
650 /*
651 * Get the options. Note for future reference. The GET of IP options gets the
652 * _received_ ones. The set sets the _sent_ ones.
653 */
654
655 int ip_getsockopt(struct sock *sk, int level, int optname, char *optval, int *optlen)
656 {
657 struct inet_opt *inet = inet_sk(sk);
658 int val;
659 int len;
660
661 if(level!=SOL_IP)
662 return -EOPNOTSUPP;
663
664 #ifdef CONFIG_IP_MROUTE
665 if(optname>=MRT_BASE && optname <=MRT_BASE+10)
666 {
667 return ip_mroute_getsockopt(sk,optname,optval,optlen);
668 }
669 #endif
670
671 if(get_user(len,optlen))
672 return -EFAULT;
673 if(len < 0)
674 return -EINVAL;
675
676 lock_sock(sk);
677
678 switch(optname) {
679 case IP_OPTIONS:
680 {
681 unsigned char optbuf[sizeof(struct ip_options)+40];
682 struct ip_options * opt = (struct ip_options*)optbuf;
683 opt->optlen = 0;
684 if (inet->opt)
685 memcpy(optbuf, inet->opt,
686 sizeof(struct ip_options)+
687 inet->opt->optlen);
688 release_sock(sk);
689
690 if (opt->optlen == 0)
691 return put_user(0, optlen);
692
693 ip_options_undo(opt);
694
695 len = min_t(unsigned int, len, opt->optlen);
696 if(put_user(len, optlen))
697 return -EFAULT;
698 if(copy_to_user(optval, opt->__data, len))
699 return -EFAULT;
700 return 0;
701 }
702 case IP_PKTINFO:
703 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
704 break;
705 case IP_RECVTTL:
706 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
707 break;
708 case IP_RECVTOS:
709 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
710 break;
711 case IP_RECVOPTS:
712 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
713 break;
714 case IP_RETOPTS:
715 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
716 break;
717 case IP_TOS:
718 val = inet->tos;
719 break;
720 case IP_TTL:
721 val = inet->ttl;
722 break;
723 case IP_HDRINCL:
724 val = inet->hdrincl;
725 break;
726 case IP_MTU_DISCOVER:
727 val = inet->pmtudisc;
728 break;
729 case IP_MTU:
730 {
731 struct dst_entry *dst;
732 val = 0;
733 dst = sk_dst_get(sk);
734 if (dst) {
735 val = dst_pmtu(dst) - dst->header_len;
736 dst_release(dst);
737 }
738 if (!val) {
739 release_sock(sk);
740 return -ENOTCONN;
741 }
742 break;
743 }
744 case IP_RECVERR:
745 val = inet->recverr;
746 break;
747 case IP_MULTICAST_TTL:
748 val = inet->mc_ttl;
749 break;
750 case IP_MULTICAST_LOOP:
751 val = inet->mc_loop;
752 break;
753 case IP_MULTICAST_IF:
754 {
755 struct in_addr addr;
756 len = min_t(unsigned int, len, sizeof(struct in_addr));
757 addr.s_addr = inet->mc_addr;
758 release_sock(sk);
759
760 if(put_user(len, optlen))
761 return -EFAULT;
762 if(copy_to_user((void *)optval, &addr, len))
763 return -EFAULT;
764 return 0;
765 }
766 case IP_PKTOPTIONS:
767 {
768 struct msghdr msg;
769
770 release_sock(sk);
771
772 if (sk->type != SOCK_STREAM)
773 return -ENOPROTOOPT;
774
775 msg.msg_control = optval;
776 msg.msg_controllen = len;
777 msg.msg_flags = 0;
778
779 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
780 struct in_pktinfo info;
781
782 info.ipi_addr.s_addr = inet->rcv_saddr;
783 info.ipi_spec_dst.s_addr = inet->rcv_saddr;
784 info.ipi_ifindex = inet->mc_index;
785 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
786 }
787 if (inet->cmsg_flags & IP_CMSG_TTL) {
788 int hlim = inet->mc_ttl;
789 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
790 }
791 len -= msg.msg_controllen;
792 return put_user(len, optlen);
793 }
794 case IP_FREEBIND:
795 val = inet->freebind;
796 break;
797 default:
798 #ifdef CONFIG_NETFILTER
799 val = nf_getsockopt(sk, PF_INET, optname, optval,
800 &len);
801 release_sock(sk);
802 if (val >= 0)
803 val = put_user(len, optlen);
804 return val;
805 #else
806 release_sock(sk);
807 return -ENOPROTOOPT;
808 #endif
809 }
810 release_sock(sk);
811
812 if (len < sizeof(int) && len > 0 && val>=0 && val<255) {
813 unsigned char ucval = (unsigned char)val;
814 len = 1;
815 if(put_user(len, optlen))
816 return -EFAULT;
817 if(copy_to_user(optval,&ucval,1))
818 return -EFAULT;
819 } else {
820 len = min_t(unsigned int, sizeof(int), len);
821 if(put_user(len, optlen))
822 return -EFAULT;
823 if(copy_to_user(optval,&val,len))
824 return -EFAULT;
825 }
826 return 0;
827 }
Mirror of the linux-mips.org kernel tree