aboutsummaryrefslogtreecommitdiffstats
path: root/net/ipv4/ip_sockglue.c
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /net/ipv4/ip_sockglue.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'net/ipv4/ip_sockglue.c')
-rw-r--r--net/ipv4/ip_sockglue.c1093
1 files changed, 1093 insertions, 0 deletions
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
new file mode 100644
index 000000000000..47012b93cad2
--- /dev/null
+++ b/net/ipv4/ip_sockglue.c
@@ -0,0 +1,1093 @@
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
58static 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
75static 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
81static 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
86static 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
95static 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
113void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
114{
115 struct inet_sock *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
143int 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_OK(msg, cmsg))
150 return -EINVAL;
151 if (cmsg->cmsg_level != SOL_IP)
152 continue;
153 switch (cmsg->cmsg_type) {
154 case IP_RETOPTS:
155 err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
156 err = ip_options_get(&ipc->opt, CMSG_DATA(cmsg), err < 40 ? err : 40, 0);
157 if (err)
158 return err;
159 break;
160 case IP_PKTINFO:
161 {
162 struct in_pktinfo *info;
163 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
164 return -EINVAL;
165 info = (struct in_pktinfo *)CMSG_DATA(cmsg);
166 ipc->oif = info->ipi_ifindex;
167 ipc->addr = info->ipi_spec_dst.s_addr;
168 break;
169 }
170 default:
171 return -EINVAL;
172 }
173 }
174 return 0;
175}
176
177
178/* Special input handler for packets caught by router alert option.
179 They are selected only by protocol field, and then processed likely
180 local ones; but only if someone wants them! Otherwise, router
181 not running rsvpd will kill RSVP.
182
183 It is user level problem, what it will make with them.
184 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
185 but receiver should be enough clever f.e. to forward mtrace requests,
186 sent to multicast group to reach destination designated router.
187 */
188struct ip_ra_chain *ip_ra_chain;
189DEFINE_RWLOCK(ip_ra_lock);
190
191int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *))
192{
193 struct ip_ra_chain *ra, *new_ra, **rap;
194
195 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num == IPPROTO_RAW)
196 return -EINVAL;
197
198 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
199
200 write_lock_bh(&ip_ra_lock);
201 for (rap = &ip_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
202 if (ra->sk == sk) {
203 if (on) {
204 write_unlock_bh(&ip_ra_lock);
205 if (new_ra)
206 kfree(new_ra);
207 return -EADDRINUSE;
208 }
209 *rap = ra->next;
210 write_unlock_bh(&ip_ra_lock);
211
212 if (ra->destructor)
213 ra->destructor(sk);
214 sock_put(sk);
215 kfree(ra);
216 return 0;
217 }
218 }
219 if (new_ra == NULL) {
220 write_unlock_bh(&ip_ra_lock);
221 return -ENOBUFS;
222 }
223 new_ra->sk = sk;
224 new_ra->destructor = destructor;
225
226 new_ra->next = ra;
227 *rap = new_ra;
228 sock_hold(sk);
229 write_unlock_bh(&ip_ra_lock);
230
231 return 0;
232}
233
234void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
235 u16 port, u32 info, u8 *payload)
236{
237 struct inet_sock *inet = inet_sk(sk);
238 struct sock_exterr_skb *serr;
239
240 if (!inet->recverr)
241 return;
242
243 skb = skb_clone(skb, GFP_ATOMIC);
244 if (!skb)
245 return;
246
247 serr = SKB_EXT_ERR(skb);
248 serr->ee.ee_errno = err;
249 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
250 serr->ee.ee_type = skb->h.icmph->type;
251 serr->ee.ee_code = skb->h.icmph->code;
252 serr->ee.ee_pad = 0;
253 serr->ee.ee_info = info;
254 serr->ee.ee_data = 0;
255 serr->addr_offset = (u8*)&(((struct iphdr*)(skb->h.icmph+1))->daddr) - skb->nh.raw;
256 serr->port = port;
257
258 skb->h.raw = payload;
259 if (!skb_pull(skb, payload - skb->data) ||
260 sock_queue_err_skb(sk, skb))
261 kfree_skb(skb);
262}
263
264void ip_local_error(struct sock *sk, int err, u32 daddr, u16 port, u32 info)
265{
266 struct inet_sock *inet = inet_sk(sk);
267 struct sock_exterr_skb *serr;
268 struct iphdr *iph;
269 struct sk_buff *skb;
270
271 if (!inet->recverr)
272 return;
273
274 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
275 if (!skb)
276 return;
277
278 iph = (struct iphdr*)skb_put(skb, sizeof(struct iphdr));
279 skb->nh.iph = iph;
280 iph->daddr = daddr;
281
282 serr = SKB_EXT_ERR(skb);
283 serr->ee.ee_errno = err;
284 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
285 serr->ee.ee_type = 0;
286 serr->ee.ee_code = 0;
287 serr->ee.ee_pad = 0;
288 serr->ee.ee_info = info;
289 serr->ee.ee_data = 0;
290 serr->addr_offset = (u8*)&iph->daddr - skb->nh.raw;
291 serr->port = port;
292
293 skb->h.raw = skb->tail;
294 __skb_pull(skb, skb->tail - skb->data);
295
296 if (sock_queue_err_skb(sk, skb))
297 kfree_skb(skb);
298}
299
300/*
301 * Handle MSG_ERRQUEUE
302 */
303int ip_recv_error(struct sock *sk, struct msghdr *msg, int len)
304{
305 struct sock_exterr_skb *serr;
306 struct sk_buff *skb, *skb2;
307 struct sockaddr_in *sin;
308 struct {
309 struct sock_extended_err ee;
310 struct sockaddr_in offender;
311 } errhdr;
312 int err;
313 int copied;
314
315 err = -EAGAIN;
316 skb = skb_dequeue(&sk->sk_error_queue);
317 if (skb == NULL)
318 goto out;
319
320 copied = skb->len;
321 if (copied > len) {
322 msg->msg_flags |= MSG_TRUNC;
323 copied = len;
324 }
325 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
326 if (err)
327 goto out_free_skb;
328
329 sock_recv_timestamp(msg, sk, skb);
330
331 serr = SKB_EXT_ERR(skb);
332
333 sin = (struct sockaddr_in *)msg->msg_name;
334 if (sin) {
335 sin->sin_family = AF_INET;
336 sin->sin_addr.s_addr = *(u32*)(skb->nh.raw + serr->addr_offset);
337 sin->sin_port = serr->port;
338 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
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 struct inet_sock *inet = inet_sk(sk);
346
347 sin->sin_family = AF_INET;
348 sin->sin_addr.s_addr = skb->nh.iph->saddr;
349 sin->sin_port = 0;
350 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
351 if (inet->cmsg_flags)
352 ip_cmsg_recv(msg, skb);
353 }
354
355 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
356
357 /* Now we could try to dump offended packet options */
358
359 msg->msg_flags |= MSG_ERRQUEUE;
360 err = copied;
361
362 /* Reset and regenerate socket error */
363 spin_lock_irq(&sk->sk_error_queue.lock);
364 sk->sk_err = 0;
365 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
366 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
367 spin_unlock_irq(&sk->sk_error_queue.lock);
368 sk->sk_error_report(sk);
369 } else
370 spin_unlock_irq(&sk->sk_error_queue.lock);
371
372out_free_skb:
373 kfree_skb(skb);
374out:
375 return err;
376}
377
378
379/*
380 * Socket option code for IP. This is the end of the line after any TCP,UDP etc options on
381 * an IP socket.
382 */
383
384int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, int optlen)
385{
386 struct inet_sock *inet = inet_sk(sk);
387 int val=0,err;
388
389 if (level != SOL_IP)
390 return -ENOPROTOOPT;
391
392 if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) |
393 (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) |
394 (1<<IP_RETOPTS) | (1<<IP_TOS) |
395 (1<<IP_TTL) | (1<<IP_HDRINCL) |
396 (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) |
397 (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND))) ||
398 optname == IP_MULTICAST_TTL ||
399 optname == IP_MULTICAST_LOOP) {
400 if (optlen >= sizeof(int)) {
401 if (get_user(val, (int __user *) optval))
402 return -EFAULT;
403 } else if (optlen >= sizeof(char)) {
404 unsigned char ucval;
405
406 if (get_user(ucval, (unsigned char __user *) optval))
407 return -EFAULT;
408 val = (int) ucval;
409 }
410 }
411
412 /* If optlen==0, it is equivalent to val == 0 */
413
414#ifdef CONFIG_IP_MROUTE
415 if (optname >= MRT_BASE && optname <= (MRT_BASE + 10))
416 return ip_mroute_setsockopt(sk,optname,optval,optlen);
417#endif
418
419 err = 0;
420 lock_sock(sk);
421
422 switch (optname) {
423 case IP_OPTIONS:
424 {
425 struct ip_options * opt = NULL;
426 if (optlen > 40 || optlen < 0)
427 goto e_inval;
428 err = ip_options_get(&opt, optval, optlen, 1);
429 if (err)
430 break;
431 if (sk->sk_type == SOCK_STREAM) {
432 struct tcp_sock *tp = tcp_sk(sk);
433#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
434 if (sk->sk_family == PF_INET ||
435 (!((1 << sk->sk_state) &
436 (TCPF_LISTEN | TCPF_CLOSE)) &&
437 inet->daddr != LOOPBACK4_IPV6)) {
438#endif
439 if (inet->opt)
440 tp->ext_header_len -= inet->opt->optlen;
441 if (opt)
442 tp->ext_header_len += opt->optlen;
443 tcp_sync_mss(sk, tp->pmtu_cookie);
444#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
445 }
446#endif
447 }
448 opt = xchg(&inet->opt, opt);
449 if (opt)
450 kfree(opt);
451 break;
452 }
453 case IP_PKTINFO:
454 if (val)
455 inet->cmsg_flags |= IP_CMSG_PKTINFO;
456 else
457 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
458 break;
459 case IP_RECVTTL:
460 if (val)
461 inet->cmsg_flags |= IP_CMSG_TTL;
462 else
463 inet->cmsg_flags &= ~IP_CMSG_TTL;
464 break;
465 case IP_RECVTOS:
466 if (val)
467 inet->cmsg_flags |= IP_CMSG_TOS;
468 else
469 inet->cmsg_flags &= ~IP_CMSG_TOS;
470 break;
471 case IP_RECVOPTS:
472 if (val)
473 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
474 else
475 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
476 break;
477 case IP_RETOPTS:
478 if (val)
479 inet->cmsg_flags |= IP_CMSG_RETOPTS;
480 else
481 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
482 break;
483 case IP_TOS: /* This sets both TOS and Precedence */
484 if (sk->sk_type == SOCK_STREAM) {
485 val &= ~3;
486 val |= inet->tos & 3;
487 }
488 if (IPTOS_PREC(val) >= IPTOS_PREC_CRITIC_ECP &&
489 !capable(CAP_NET_ADMIN)) {
490 err = -EPERM;
491 break;
492 }
493 if (inet->tos != val) {
494 inet->tos = val;
495 sk->sk_priority = rt_tos2priority(val);
496 sk_dst_reset(sk);
497 }
498 break;
499 case IP_TTL:
500 if (optlen<1)
501 goto e_inval;
502 if (val != -1 && (val < 1 || val>255))
503 goto e_inval;
504 inet->uc_ttl = val;
505 break;
506 case IP_HDRINCL:
507 if (sk->sk_type != SOCK_RAW) {
508 err = -ENOPROTOOPT;
509 break;
510 }
511 inet->hdrincl = val ? 1 : 0;
512 break;
513 case IP_MTU_DISCOVER:
514 if (val<0 || val>2)
515 goto e_inval;
516 inet->pmtudisc = val;
517 break;
518 case IP_RECVERR:
519 inet->recverr = !!val;
520 if (!val)
521 skb_queue_purge(&sk->sk_error_queue);
522 break;
523 case IP_MULTICAST_TTL:
524 if (sk->sk_type == SOCK_STREAM)
525 goto e_inval;
526 if (optlen<1)
527 goto e_inval;
528 if (val==-1)
529 val = 1;
530 if (val < 0 || val > 255)
531 goto e_inval;
532 inet->mc_ttl = val;
533 break;
534 case IP_MULTICAST_LOOP:
535 if (optlen<1)
536 goto e_inval;
537 inet->mc_loop = !!val;
538 break;
539 case IP_MULTICAST_IF:
540 {
541 struct ip_mreqn mreq;
542 struct net_device *dev = NULL;
543
544 if (sk->sk_type == SOCK_STREAM)
545 goto e_inval;
546 /*
547 * Check the arguments are allowable
548 */
549
550 err = -EFAULT;
551 if (optlen >= sizeof(struct ip_mreqn)) {
552 if (copy_from_user(&mreq,optval,sizeof(mreq)))
553 break;
554 } else {
555 memset(&mreq, 0, sizeof(mreq));
556 if (optlen >= sizeof(struct in_addr) &&
557 copy_from_user(&mreq.imr_address,optval,sizeof(struct in_addr)))
558 break;
559 }
560
561 if (!mreq.imr_ifindex) {
562 if (mreq.imr_address.s_addr == INADDR_ANY) {
563 inet->mc_index = 0;
564 inet->mc_addr = 0;
565 err = 0;
566 break;
567 }
568 dev = ip_dev_find(mreq.imr_address.s_addr);
569 if (dev) {
570 mreq.imr_ifindex = dev->ifindex;
571 dev_put(dev);
572 }
573 } else
574 dev = __dev_get_by_index(mreq.imr_ifindex);
575
576
577 err = -EADDRNOTAVAIL;
578 if (!dev)
579 break;
580
581 err = -EINVAL;
582 if (sk->sk_bound_dev_if &&
583 mreq.imr_ifindex != sk->sk_bound_dev_if)
584 break;
585
586 inet->mc_index = mreq.imr_ifindex;
587 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_MSFILTER:
616 {
617 extern int sysctl_optmem_max;
618 extern int sysctl_igmp_max_msf;
619 struct ip_msfilter *msf;
620
621 if (optlen < IP_MSFILTER_SIZE(0))
622 goto e_inval;
623 if (optlen > sysctl_optmem_max) {
624 err = -ENOBUFS;
625 break;
626 }
627 msf = (struct ip_msfilter *)kmalloc(optlen, GFP_KERNEL);
628 if (msf == 0) {
629 err = -ENOBUFS;
630 break;
631 }
632 err = -EFAULT;
633 if (copy_from_user(msf, optval, optlen)) {
634 kfree(msf);
635 break;
636 }
637 /* numsrc >= (1G-4) overflow in 32 bits */
638 if (msf->imsf_numsrc >= 0x3ffffffcU ||
639 msf->imsf_numsrc > sysctl_igmp_max_msf) {
640 kfree(msf);
641 err = -ENOBUFS;
642 break;
643 }
644 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
645 kfree(msf);
646 err = -EINVAL;
647 break;
648 }
649 err = ip_mc_msfilter(sk, msf, 0);
650 kfree(msf);
651 break;
652 }
653 case IP_BLOCK_SOURCE:
654 case IP_UNBLOCK_SOURCE:
655 case IP_ADD_SOURCE_MEMBERSHIP:
656 case IP_DROP_SOURCE_MEMBERSHIP:
657 {
658 struct ip_mreq_source mreqs;
659 int omode, add;
660
661 if (optlen != sizeof(struct ip_mreq_source))
662 goto e_inval;
663 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
664 err = -EFAULT;
665 break;
666 }
667 if (optname == IP_BLOCK_SOURCE) {
668 omode = MCAST_EXCLUDE;
669 add = 1;
670 } else if (optname == IP_UNBLOCK_SOURCE) {
671 omode = MCAST_EXCLUDE;
672 add = 0;
673 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
674 struct ip_mreqn mreq;
675
676 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
677 mreq.imr_address.s_addr = mreqs.imr_interface;
678 mreq.imr_ifindex = 0;
679 err = ip_mc_join_group(sk, &mreq);
680 if (err)
681 break;
682 omode = MCAST_INCLUDE;
683 add = 1;
684 } else /*IP_DROP_SOURCE_MEMBERSHIP */ {
685 omode = MCAST_INCLUDE;
686 add = 0;
687 }
688 err = ip_mc_source(add, omode, sk, &mreqs, 0);
689 break;
690 }
691 case MCAST_JOIN_GROUP:
692 case MCAST_LEAVE_GROUP:
693 {
694 struct group_req greq;
695 struct sockaddr_in *psin;
696 struct ip_mreqn mreq;
697
698 if (optlen < sizeof(struct group_req))
699 goto e_inval;
700 err = -EFAULT;
701 if(copy_from_user(&greq, optval, sizeof(greq)))
702 break;
703 psin = (struct sockaddr_in *)&greq.gr_group;
704 if (psin->sin_family != AF_INET)
705 goto e_inval;
706 memset(&mreq, 0, sizeof(mreq));
707 mreq.imr_multiaddr = psin->sin_addr;
708 mreq.imr_ifindex = greq.gr_interface;
709
710 if (optname == MCAST_JOIN_GROUP)
711 err = ip_mc_join_group(sk, &mreq);
712 else
713 err = ip_mc_leave_group(sk, &mreq);
714 break;
715 }
716 case MCAST_JOIN_SOURCE_GROUP:
717 case MCAST_LEAVE_SOURCE_GROUP:
718 case MCAST_BLOCK_SOURCE:
719 case MCAST_UNBLOCK_SOURCE:
720 {
721 struct group_source_req greqs;
722 struct ip_mreq_source mreqs;
723 struct sockaddr_in *psin;
724 int omode, add;
725
726 if (optlen != sizeof(struct group_source_req))
727 goto e_inval;
728 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
729 err = -EFAULT;
730 break;
731 }
732 if (greqs.gsr_group.ss_family != AF_INET ||
733 greqs.gsr_source.ss_family != AF_INET) {
734 err = -EADDRNOTAVAIL;
735 break;
736 }
737 psin = (struct sockaddr_in *)&greqs.gsr_group;
738 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
739 psin = (struct sockaddr_in *)&greqs.gsr_source;
740 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
741 mreqs.imr_interface = 0; /* use index for mc_source */
742
743 if (optname == MCAST_BLOCK_SOURCE) {
744 omode = MCAST_EXCLUDE;
745 add = 1;
746 } else if (optname == MCAST_UNBLOCK_SOURCE) {
747 omode = MCAST_EXCLUDE;
748 add = 0;
749 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
750 struct ip_mreqn mreq;
751
752 psin = (struct sockaddr_in *)&greqs.gsr_group;
753 mreq.imr_multiaddr = psin->sin_addr;
754 mreq.imr_address.s_addr = 0;
755 mreq.imr_ifindex = greqs.gsr_interface;
756 err = ip_mc_join_group(sk, &mreq);
757 if (err)
758 break;
759 greqs.gsr_interface = mreq.imr_ifindex;
760 omode = MCAST_INCLUDE;
761 add = 1;
762 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
763 omode = MCAST_INCLUDE;
764 add = 0;
765 }
766 err = ip_mc_source(add, omode, sk, &mreqs,
767 greqs.gsr_interface);
768 break;
769 }
770 case MCAST_MSFILTER:
771 {
772 extern int sysctl_optmem_max;
773 extern int sysctl_igmp_max_msf;
774 struct sockaddr_in *psin;
775 struct ip_msfilter *msf = NULL;
776 struct group_filter *gsf = NULL;
777 int msize, i, ifindex;
778
779 if (optlen < GROUP_FILTER_SIZE(0))
780 goto e_inval;
781 if (optlen > sysctl_optmem_max) {
782 err = -ENOBUFS;
783 break;
784 }
785 gsf = (struct group_filter *)kmalloc(optlen,GFP_KERNEL);
786 if (gsf == 0) {
787 err = -ENOBUFS;
788 break;
789 }
790 err = -EFAULT;
791 if (copy_from_user(gsf, optval, optlen)) {
792 goto mc_msf_out;
793 }
794 /* numsrc >= (4G-140)/128 overflow in 32 bits */
795 if (gsf->gf_numsrc >= 0x1ffffff ||
796 gsf->gf_numsrc > sysctl_igmp_max_msf) {
797 err = -ENOBUFS;
798 goto mc_msf_out;
799 }
800 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
801 err = -EINVAL;
802 goto mc_msf_out;
803 }
804 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
805 msf = (struct ip_msfilter *)kmalloc(msize,GFP_KERNEL);
806 if (msf == 0) {
807 err = -ENOBUFS;
808 goto mc_msf_out;
809 }
810 ifindex = gsf->gf_interface;
811 psin = (struct sockaddr_in *)&gsf->gf_group;
812 if (psin->sin_family != AF_INET) {
813 err = -EADDRNOTAVAIL;
814 goto mc_msf_out;
815 }
816 msf->imsf_multiaddr = psin->sin_addr.s_addr;
817 msf->imsf_interface = 0;
818 msf->imsf_fmode = gsf->gf_fmode;
819 msf->imsf_numsrc = gsf->gf_numsrc;
820 err = -EADDRNOTAVAIL;
821 for (i=0; i<gsf->gf_numsrc; ++i) {
822 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
823
824 if (psin->sin_family != AF_INET)
825 goto mc_msf_out;
826 msf->imsf_slist[i] = psin->sin_addr.s_addr;
827 }
828 kfree(gsf);
829 gsf = NULL;
830
831 err = ip_mc_msfilter(sk, msf, ifindex);
832mc_msf_out:
833 if (msf)
834 kfree(msf);
835 if (gsf)
836 kfree(gsf);
837 break;
838 }
839 case IP_ROUTER_ALERT:
840 err = ip_ra_control(sk, val ? 1 : 0, NULL);
841 break;
842
843 case IP_FREEBIND:
844 if (optlen<1)
845 goto e_inval;
846 inet->freebind = !!val;
847 break;
848
849 case IP_IPSEC_POLICY:
850 case IP_XFRM_POLICY:
851 err = xfrm_user_policy(sk, optname, optval, optlen);
852 break;
853
854 default:
855#ifdef CONFIG_NETFILTER
856 err = nf_setsockopt(sk, PF_INET, optname, optval,
857 optlen);
858#else
859 err = -ENOPROTOOPT;
860#endif
861 break;
862 }
863 release_sock(sk);
864 return err;
865
866e_inval:
867 release_sock(sk);
868 return -EINVAL;
869}
870
871/*
872 * Get the options. Note for future reference. The GET of IP options gets the
873 * _received_ ones. The set sets the _sent_ ones.
874 */
875
876int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen)
877{
878 struct inet_sock *inet = inet_sk(sk);
879 int val;
880 int len;
881
882 if(level!=SOL_IP)
883 return -EOPNOTSUPP;
884
885#ifdef CONFIG_IP_MROUTE
886 if(optname>=MRT_BASE && optname <=MRT_BASE+10)
887 {
888 return ip_mroute_getsockopt(sk,optname,optval,optlen);
889 }
890#endif
891
892 if(get_user(len,optlen))
893 return -EFAULT;
894 if(len < 0)
895 return -EINVAL;
896
897 lock_sock(sk);
898
899 switch(optname) {
900 case IP_OPTIONS:
901 {
902 unsigned char optbuf[sizeof(struct ip_options)+40];
903 struct ip_options * opt = (struct ip_options*)optbuf;
904 opt->optlen = 0;
905 if (inet->opt)
906 memcpy(optbuf, inet->opt,
907 sizeof(struct ip_options)+
908 inet->opt->optlen);
909 release_sock(sk);
910
911 if (opt->optlen == 0)
912 return put_user(0, optlen);
913
914 ip_options_undo(opt);
915
916 len = min_t(unsigned int, len, opt->optlen);
917 if(put_user(len, optlen))
918 return -EFAULT;
919 if(copy_to_user(optval, opt->__data, len))
920 return -EFAULT;
921 return 0;
922 }
923 case IP_PKTINFO:
924 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
925 break;
926 case IP_RECVTTL:
927 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
928 break;
929 case IP_RECVTOS:
930 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
931 break;
932 case IP_RECVOPTS:
933 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
934 break;
935 case IP_RETOPTS:
936 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
937 break;
938 case IP_TOS:
939 val = inet->tos;
940 break;
941 case IP_TTL:
942 val = (inet->uc_ttl == -1 ?
943 sysctl_ip_default_ttl :
944 inet->uc_ttl);
945 break;
946 case IP_HDRINCL:
947 val = inet->hdrincl;
948 break;
949 case IP_MTU_DISCOVER:
950 val = inet->pmtudisc;
951 break;
952 case IP_MTU:
953 {
954 struct dst_entry *dst;
955 val = 0;
956 dst = sk_dst_get(sk);
957 if (dst) {
958 val = dst_mtu(dst);
959 dst_release(dst);
960 }
961 if (!val) {
962 release_sock(sk);
963 return -ENOTCONN;
964 }
965 break;
966 }
967 case IP_RECVERR:
968 val = inet->recverr;
969 break;
970 case IP_MULTICAST_TTL:
971 val = inet->mc_ttl;
972 break;
973 case IP_MULTICAST_LOOP:
974 val = inet->mc_loop;
975 break;
976 case IP_MULTICAST_IF:
977 {
978 struct in_addr addr;
979 len = min_t(unsigned int, len, sizeof(struct in_addr));
980 addr.s_addr = inet->mc_addr;
981 release_sock(sk);
982
983 if(put_user(len, optlen))
984 return -EFAULT;
985 if(copy_to_user(optval, &addr, len))
986 return -EFAULT;
987 return 0;
988 }
989 case IP_MSFILTER:
990 {
991 struct ip_msfilter msf;
992 int err;
993
994 if (len < IP_MSFILTER_SIZE(0)) {
995 release_sock(sk);
996 return -EINVAL;
997 }
998 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
999 release_sock(sk);
1000 return -EFAULT;
1001 }
1002 err = ip_mc_msfget(sk, &msf,
1003 (struct ip_msfilter __user *)optval, optlen);
1004 release_sock(sk);
1005 return err;
1006 }
1007 case MCAST_MSFILTER:
1008 {
1009 struct group_filter gsf;
1010 int err;
1011
1012 if (len < GROUP_FILTER_SIZE(0)) {
1013 release_sock(sk);
1014 return -EINVAL;
1015 }
1016 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1017 release_sock(sk);
1018 return -EFAULT;
1019 }
1020 err = ip_mc_gsfget(sk, &gsf,
1021 (struct group_filter __user *)optval, optlen);
1022 release_sock(sk);
1023 return err;
1024 }
1025 case IP_PKTOPTIONS:
1026 {
1027 struct msghdr msg;
1028
1029 release_sock(sk);
1030
1031 if (sk->sk_type != SOCK_STREAM)
1032 return -ENOPROTOOPT;
1033
1034 msg.msg_control = optval;
1035 msg.msg_controllen = len;
1036 msg.msg_flags = 0;
1037
1038 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1039 struct in_pktinfo info;
1040
1041 info.ipi_addr.s_addr = inet->rcv_saddr;
1042 info.ipi_spec_dst.s_addr = inet->rcv_saddr;
1043 info.ipi_ifindex = inet->mc_index;
1044 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1045 }
1046 if (inet->cmsg_flags & IP_CMSG_TTL) {
1047 int hlim = inet->mc_ttl;
1048 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1049 }
1050 len -= msg.msg_controllen;
1051 return put_user(len, optlen);
1052 }
1053 case IP_FREEBIND:
1054 val = inet->freebind;
1055 break;
1056 default:
1057#ifdef CONFIG_NETFILTER
1058 val = nf_getsockopt(sk, PF_INET, optname, optval,
1059 &len);
1060 release_sock(sk);
1061 if (val >= 0)
1062 val = put_user(len, optlen);
1063 return val;
1064#else
1065 release_sock(sk);
1066 return -ENOPROTOOPT;
1067#endif
1068 }
1069 release_sock(sk);
1070
1071 if (len < sizeof(int) && len > 0 && val>=0 && val<255) {
1072 unsigned char ucval = (unsigned char)val;
1073 len = 1;
1074 if(put_user(len, optlen))
1075 return -EFAULT;
1076 if(copy_to_user(optval,&ucval,1))
1077 return -EFAULT;
1078 } else {
1079 len = min_t(unsigned int, sizeof(int), len);
1080 if(put_user(len, optlen))
1081 return -EFAULT;
1082 if(copy_to_user(optval,&val,len))
1083 return -EFAULT;
1084 }
1085 return 0;
1086}
1087
1088EXPORT_SYMBOL(ip_cmsg_recv);
1089
1090#ifdef CONFIG_IP_SCTP_MODULE
1091EXPORT_SYMBOL(ip_getsockopt);
1092EXPORT_SYMBOL(ip_setsockopt);
1093#endif
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-10 15:29:02 -0500