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 1.54 2000/11/28 13:34:56 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 #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 MAX(a,b) ((a)>(b)?(a):(b))
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 unsigned flags = skb->sk->protinfo.af_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 || 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 sock_exterr_skb *serr;
240
241 if (!sk->protinfo.af_inet.recverr)
242 return;
243
244 skb = skb_clone(skb, GFP_ATOMIC);
245 if (!skb)
246 return;
247
248 serr = SKB_EXT_ERR(skb);
249 serr->ee.ee_errno = err;
250 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
251 serr->ee.ee_type = skb->h.icmph->type;
252 serr->ee.ee_code = skb->h.icmph->code;
253 serr->ee.ee_pad = 0;
254 serr->ee.ee_info = info;
255 serr->ee.ee_data = 0;
256 serr->addr_offset = (u8*)&(((struct iphdr*)(skb->h.icmph+1))->daddr) - skb->nh.raw;
257 serr->port = port;
258
259 skb->h.raw = payload;
260 skb_pull(skb, payload - skb->data);
261
262 if (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 sock_exterr_skb *serr;
269 struct iphdr *iph;
270 struct sk_buff *skb;
271
272 if (!sk->protinfo.af_inet.recverr)
273 return;
274
275 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
276 if (!skb)
277 return;
278
279 iph = (struct iphdr*)skb_put(skb, sizeof(struct iphdr));
280 skb->nh.iph = iph;
281 iph->daddr = daddr;
282
283 serr = SKB_EXT_ERR(skb);
284 serr->ee.ee_errno = err;
285 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
286 serr->ee.ee_type = 0;
287 serr->ee.ee_code = 0;
288 serr->ee.ee_pad = 0;
289 serr->ee.ee_info = info;
290 serr->ee.ee_data = 0;
291 serr->addr_offset = (u8*)&iph->daddr - skb->nh.raw;
292 serr->port = port;
293
294 skb->h.raw = skb->tail;
295 skb_pull(skb, skb->tail - skb->data);
296
297 if (sock_queue_err_skb(sk, skb))
298 kfree_skb(skb);
299 }
300
301 /*
302 * Handle MSG_ERRQUEUE
303 */
304 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len)
305 {
306 struct sock_exterr_skb *serr;
307 struct sk_buff *skb, *skb2;
308 struct sockaddr_in *sin;
309 struct {
310 struct sock_extended_err ee;
311 struct sockaddr_in offender;
312 } errhdr;
313 int err;
314 int copied;
315
316 err = -EAGAIN;
317 skb = skb_dequeue(&sk->error_queue);
318 if (skb == NULL)
319 goto out;
320
321 copied = skb->len;
322 if (copied > len) {
323 msg->msg_flags |= MSG_TRUNC;
324 copied = len;
325 }
326 err = memcpy_toiovec(msg->msg_iov, skb->data, copied);
327 if (err)
328 goto out_free_skb;
329
330 sock_recv_timestamp(msg, sk, skb);
331
332 serr = SKB_EXT_ERR(skb);
333
334 sin = (struct sockaddr_in *)msg->msg_name;
335 if (sin) {
336 sin->sin_family = AF_INET;
337 sin->sin_addr.s_addr = *(u32*)(skb->nh.raw + serr->addr_offset);
338 sin->sin_port = serr->port;
339 }
340
341 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
342 sin = &errhdr.offender;
343 sin->sin_family = AF_UNSPEC;
344 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
345 sin->sin_family = AF_INET;
346 sin->sin_addr.s_addr = skb->nh.iph->saddr;
347 if (sk->protinfo.af_inet.cmsg_flags)
348 ip_cmsg_recv(msg, skb);
349 }
350
351 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
352
353 /* Now we could try to dump offended packet options */
354
355 msg->msg_flags |= MSG_ERRQUEUE;
356 err = copied;
357
358 /* Reset and regenerate socket error */
359 spin_lock_irq(&sk->error_queue.lock);
360 sk->err = 0;
361 if ((skb2 = skb_peek(&sk->error_queue)) != NULL) {
362 sk->err = SKB_EXT_ERR(skb2)->ee.ee_errno;
363 spin_unlock_irq(&sk->error_queue.lock);
364 sk->error_report(sk);
365 } else {
366 spin_unlock_irq(&sk->error_queue.lock);
367 }
368
369 out_free_skb:
370 kfree_skb(skb);
371 out:
372 return err;
373 }
374
375
376 /*
377 * Socket option code for IP. This is the end of the line after any TCP,UDP etc options on
378 * an IP socket.
379 */
380
381 int ip_setsockopt(struct sock *sk, int level, int optname, char *optval, int optlen)
382 {
383 int val=0,err;
384
385 if (level != SOL_IP)
386 return -ENOPROTOOPT;
387
388 if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) |
389 (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) |
390 (1<<IP_RETOPTS) | (1<<IP_TOS) |
391 (1<<IP_TTL) | (1<<IP_HDRINCL) |
392 (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) |
393 (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND))) ||
394 optname == IP_MULTICAST_TTL ||
395 optname == IP_MULTICAST_LOOP) {
396 if (optlen >= sizeof(int)) {
397 if (get_user(val, (int *) optval))
398 return -EFAULT;
399 } else if (optlen >= sizeof(char)) {
400 unsigned char ucval;
401
402 if (get_user(ucval, (unsigned char *) optval))
403 return -EFAULT;
404 val = (int) ucval;
405 }
406 }
407
408 /* If optlen==0, it is equivalent to val == 0 */
409
410 #ifdef CONFIG_IP_MROUTE
411 if (optname >= MRT_BASE && optname <= (MRT_BASE + 10))
412 return ip_mroute_setsockopt(sk,optname,optval,optlen);
413 #endif
414
415 err = 0;
416 lock_sock(sk);
417
418 switch (optname) {
419 case IP_OPTIONS:
420 {
421 struct ip_options * opt = NULL;
422 if (optlen > 40 || optlen < 0)
423 goto e_inval;
424 err = ip_options_get(&opt, optval, optlen, 1);
425 if (err)
426 break;
427 if (sk->type == SOCK_STREAM) {
428 struct tcp_opt *tp = &sk->tp_pinfo.af_tcp;
429 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
430 if (sk->family == PF_INET ||
431 (!((1<<sk->state)&(TCPF_LISTEN|TCPF_CLOSE))
432 && sk->daddr != LOOPBACK4_IPV6)) {
433 #endif
434 if (opt)
435 tp->ext_header_len = opt->optlen;
436 tcp_sync_mss(sk, tp->pmtu_cookie);
437 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
438 }
439 #endif
440 }
441 opt = xchg(&sk->protinfo.af_inet.opt, opt);
442 if (opt)
443 kfree(opt);
444 break;
445 }
446 case IP_PKTINFO:
447 if (val)
448 sk->protinfo.af_inet.cmsg_flags |= IP_CMSG_PKTINFO;
449 else
450 sk->protinfo.af_inet.cmsg_flags &= ~IP_CMSG_PKTINFO;
451 break;
452 case IP_RECVTTL:
453 if (val)
454 sk->protinfo.af_inet.cmsg_flags |= IP_CMSG_TTL;
455 else
456 sk->protinfo.af_inet.cmsg_flags &= ~IP_CMSG_TTL;
457 break;
458 case IP_RECVTOS:
459 if (val)
460 sk->protinfo.af_inet.cmsg_flags |= IP_CMSG_TOS;
461 else
462 sk->protinfo.af_inet.cmsg_flags &= ~IP_CMSG_TOS;
463 break;
464 case IP_RECVOPTS:
465 if (val)
466 sk->protinfo.af_inet.cmsg_flags |= IP_CMSG_RECVOPTS;
467 else
468 sk->protinfo.af_inet.cmsg_flags &= ~IP_CMSG_RECVOPTS;
469 break;
470 case IP_RETOPTS:
471 if (val)
472 sk->protinfo.af_inet.cmsg_flags |= IP_CMSG_RETOPTS;
473 else
474 sk->protinfo.af_inet.cmsg_flags &= ~IP_CMSG_RETOPTS;
475 break;
476 case IP_TOS: /* This sets both TOS and Precedence */
477 /* Reject setting of unused bits */
478 #ifndef CONFIG_INET_ECN
479 if (val & ~(IPTOS_TOS_MASK|IPTOS_PREC_MASK))
480 goto e_inval;
481 #else
482 if (sk->type == SOCK_STREAM) {
483 val &= ~3;
484 val |= sk->protinfo.af_inet.tos & 3;
485 }
486 #endif
487 if (IPTOS_PREC(val) >= IPTOS_PREC_CRITIC_ECP &&
488 !capable(CAP_NET_ADMIN)) {
489 err = -EPERM;
490 break;
491 }
492 if (sk->protinfo.af_inet.tos != val) {
493 sk->protinfo.af_inet.tos=val;
494 sk->priority = rt_tos2priority(val);
495 sk_dst_reset(sk);
496 }
497 break;
498 case IP_TTL:
499 if (optlen<1)
500 goto e_inval;
501 if(val==-1)
502 val = sysctl_ip_default_ttl;
503 if(val<1||val>255)
504 goto e_inval;
505 sk->protinfo.af_inet.ttl=val;
506 break;
507 case IP_HDRINCL:
508 if(sk->type!=SOCK_RAW) {
509 err = -ENOPROTOOPT;
510 break;
511 }
512 sk->protinfo.af_inet.hdrincl=val?1:0;
513 break;
514 case IP_MTU_DISCOVER:
515 if (val<0 || val>2)
516 goto e_inval;
517 sk->protinfo.af_inet.pmtudisc = val;
518 break;
519 case IP_RECVERR:
520 sk->protinfo.af_inet.recverr = !!val;
521 if (!val)
522 skb_queue_purge(&sk->error_queue);
523 break;
524 case IP_MULTICAST_TTL:
525 if (sk->type == SOCK_STREAM)
526 goto e_inval;
527 if (optlen<1)
528 goto e_inval;
529 if (val==-1)
530 val = 1;
531 if (val < 0 || val > 255)
532 goto e_inval;
533 sk->protinfo.af_inet.mc_ttl=val;
534 break;
535 case IP_MULTICAST_LOOP:
536 if (optlen<1)
537 goto e_inval;
538 sk->protinfo.af_inet.mc_loop = val ? 1 : 0;
539 break;
540 case IP_MULTICAST_IF:
541 {
542 struct ip_mreqn mreq;
543 struct net_device *dev = NULL;
544
545 if (sk->type == SOCK_STREAM)
546 goto e_inval;
547 /*
548 * Check the arguments are allowable
549 */
550
551 err = -EFAULT;
552 if (optlen >= sizeof(struct ip_mreqn)) {
553 if (copy_from_user(&mreq,optval,sizeof(mreq)))
554 break;
555 } else {
556 memset(&mreq, 0, sizeof(mreq));
557 if (optlen >= sizeof(struct in_addr) &&
558 copy_from_user(&mreq.imr_address,optval,sizeof(struct in_addr)))
559 break;
560 }
561
562 if (!mreq.imr_ifindex) {
563 if (mreq.imr_address.s_addr == INADDR_ANY) {
564 sk->protinfo.af_inet.mc_index = 0;
565 sk->protinfo.af_inet.mc_addr = 0;
566 err = 0;
567 break;
568 }
569 dev = ip_dev_find(mreq.imr_address.s_addr);
570 if (dev) {
571 mreq.imr_ifindex = dev->ifindex;
572 dev_put(dev);
573 }
574 } else
575 dev = __dev_get_by_index(mreq.imr_ifindex);
576
577
578 err = -EADDRNOTAVAIL;
579 if (!dev)
580 break;
581
582 err = -EINVAL;
583 if (sk->bound_dev_if && mreq.imr_ifindex != sk->bound_dev_if)
584 break;
585
586 sk->protinfo.af_inet.mc_index = mreq.imr_ifindex;
587 sk->protinfo.af_inet.mc_addr = mreq.imr_address.s_addr;
588 err = 0;
589 break;
590 }
591
592 case IP_ADD_MEMBERSHIP:
593 case IP_DROP_MEMBERSHIP:
594 {
595 struct ip_mreqn mreq;
596
597 if (optlen < sizeof(struct ip_mreq))
598 goto e_inval;
599 err = -EFAULT;
600 if (optlen >= sizeof(struct ip_mreqn)) {
601 if(copy_from_user(&mreq,optval,sizeof(mreq)))
602 break;
603 } else {
604 memset(&mreq, 0, sizeof(mreq));
605 if (copy_from_user(&mreq,optval,sizeof(struct ip_mreq)))
606 break;
607 }
608
609 if (optname == IP_ADD_MEMBERSHIP)
610 err = ip_mc_join_group(sk,&mreq);
611 else
612 err = ip_mc_leave_group(sk,&mreq);
613 break;
614 }
615 case IP_ROUTER_ALERT:
616 err = ip_ra_control(sk, val ? 1 : 0, NULL);
617 break;
618
619 case IP_FREEBIND:
620 if (optlen<1)
621 goto e_inval;
622 sk->protinfo.af_inet.freebind = !!val;
623 break;
624
625 default:
626 #ifdef CONFIG_NETFILTER
627 err = nf_setsockopt(sk, PF_INET, optname, optval,
628 optlen);
629 #else
630 err = -ENOPROTOOPT;
631 #endif
632 break;
633 }
634 release_sock(sk);
635 return err;
636
637 e_inval:
638 release_sock(sk);
639 return -EINVAL;
640 }
641
642 /*
643 * Get the options. Note for future reference. The GET of IP options gets the
644 * _received_ ones. The set sets the _sent_ ones.
645 */
646
647 int ip_getsockopt(struct sock *sk, int level, int optname, char *optval, int *optlen)
648 {
649 int val;
650 int len;
651
652 if(level!=SOL_IP)
653 return -EOPNOTSUPP;
654
655 #ifdef CONFIG_IP_MROUTE
656 if(optname>=MRT_BASE && optname <=MRT_BASE+10)
657 {
658 return ip_mroute_getsockopt(sk,optname,optval,optlen);
659 }
660 #endif
661
662 if(get_user(len,optlen))
663 return -EFAULT;
664
665 lock_sock(sk);
666
667 switch(optname) {
668 case IP_OPTIONS:
669 {
670 unsigned char optbuf[sizeof(struct ip_options)+40];
671 struct ip_options * opt = (struct ip_options*)optbuf;
672 opt->optlen = 0;
673 if (sk->protinfo.af_inet.opt)
674 memcpy(optbuf, sk->protinfo.af_inet.opt,
675 sizeof(struct ip_options)+
676 sk->protinfo.af_inet.opt->optlen);
677 release_sock(sk);
678
679 if (opt->optlen == 0)
680 return put_user(0, optlen);
681
682 ip_options_undo(opt);
683
684 len=min(len, opt->optlen);
685 if(put_user(len, optlen))
686 return -EFAULT;
687 if(copy_to_user(optval, opt->__data, len))
688 return -EFAULT;
689 return 0;
690 }
691 case IP_PKTINFO:
692 val = (sk->protinfo.af_inet.cmsg_flags & IP_CMSG_PKTINFO) != 0;
693 break;
694 case IP_RECVTTL:
695 val = (sk->protinfo.af_inet.cmsg_flags & IP_CMSG_TTL) != 0;
696 break;
697 case IP_RECVTOS:
698 val = (sk->protinfo.af_inet.cmsg_flags & IP_CMSG_TOS) != 0;
699 break;
700 case IP_RECVOPTS:
701 val = (sk->protinfo.af_inet.cmsg_flags & IP_CMSG_RECVOPTS) != 0;
702 break;
703 case IP_RETOPTS:
704 val = (sk->protinfo.af_inet.cmsg_flags & IP_CMSG_RETOPTS) != 0;
705 break;
706 case IP_TOS:
707 val=sk->protinfo.af_inet.tos;
708 break;
709 case IP_TTL:
710 val=sk->protinfo.af_inet.ttl;
711 break;
712 case IP_HDRINCL:
713 val=sk->protinfo.af_inet.hdrincl;
714 break;
715 case IP_MTU_DISCOVER:
716 val=sk->protinfo.af_inet.pmtudisc;
717 break;
718 case IP_MTU:
719 {
720 struct dst_entry *dst;
721 val = 0;
722 dst = sk_dst_get(sk);
723 if (dst) {
724 val = dst->pmtu;
725 dst_release(dst);
726 }
727 if (!val) {
728 release_sock(sk);
729 return -ENOTCONN;
730 }
731 break;
732 }
733 case IP_RECVERR:
734 val=sk->protinfo.af_inet.recverr;
735 break;
736 case IP_MULTICAST_TTL:
737 val=sk->protinfo.af_inet.mc_ttl;
738 break;
739 case IP_MULTICAST_LOOP:
740 val=sk->protinfo.af_inet.mc_loop;
741 break;
742 case IP_MULTICAST_IF:
743 {
744 struct in_addr addr;
745 len = min(len,sizeof(struct in_addr));
746 addr.s_addr = sk->protinfo.af_inet.mc_addr;
747 release_sock(sk);
748
749 if(put_user(len, optlen))
750 return -EFAULT;
751 if(copy_to_user((void *)optval, &addr, len))
752 return -EFAULT;
753 return 0;
754 }
755 case IP_PKTOPTIONS:
756 {
757 struct msghdr msg;
758
759 release_sock(sk);
760
761 if (sk->type != SOCK_STREAM)
762 return -ENOPROTOOPT;
763
764 msg.msg_control = optval;
765 msg.msg_controllen = len;
766 msg.msg_flags = 0;
767
768 if (sk->protinfo.af_inet.cmsg_flags&IP_CMSG_PKTINFO) {
769 struct in_pktinfo info;
770
771 info.ipi_addr.s_addr = sk->rcv_saddr;
772 info.ipi_spec_dst.s_addr = sk->rcv_saddr;
773 info.ipi_ifindex = sk->protinfo.af_inet.mc_index;
774 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
775 }
776 if (sk->protinfo.af_inet.cmsg_flags&IP_CMSG_TTL) {
777 int hlim = sk->protinfo.af_inet.mc_ttl;
778 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
779 }
780 len -= msg.msg_controllen;
781 return put_user(len, optlen);
782 }
783 case IP_FREEBIND:
784 val = sk->protinfo.af_inet.freebind;
785 break;
786 default:
787 #ifdef CONFIG_NETFILTER
788 val = nf_getsockopt(sk, PF_INET, optname, optval,
789 &len);
790 release_sock(sk);
791 if (val >= 0)
792 val = put_user(len, optlen);
793 return val;
794 #else
795 release_sock(sk);
796 return -ENOPROTOOPT;
797 #endif
798 }
799 release_sock(sk);
800
801 if (len < sizeof(int) && len > 0 && val>=0 && val<255) {
802 unsigned char ucval = (unsigned char)val;
803 len = 1;
804 if(put_user(len, optlen))
805 return -EFAULT;
806 if(copy_to_user(optval,&ucval,1))
807 return -EFAULT;
808 } else {
809 len=min(sizeof(int),len);
810 if(put_user(len, optlen))
811 return -EFAULT;
812 if(copy_to_user(optval,&val,len))
813 return -EFAULT;
814 }
815 return 0;
816 }
817
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