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OMAP: Add new function to check wether there is irq pending
[linux-ginger.git] / net / ipv4 / ip_sockglue.c
blob43c05854d752f94c88dbb3dbd4ab43a111a93d0d
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 * Authors: see ip.c
9 *
10 * Fixes:
11 * Many : Split from ip.c , see ip.c for history.
12 * Martin Mares : TOS setting fixed.
13 * Alan Cox : Fixed a couple of oopses in Martin's
14 * TOS tweaks.
15 * Mike McLagan : Routing by source
16 */
17
18 #include <linux/module.h>
19 #include <linux/types.h>
20 #include <linux/mm.h>
21 #include <linux/skbuff.h>
22 #include <linux/ip.h>
23 #include <linux/icmp.h>
24 #include <linux/inetdevice.h>
25 #include <linux/netdevice.h>
26 #include <net/sock.h>
27 #include <net/ip.h>
28 #include <net/icmp.h>
29 #include <net/tcp_states.h>
30 #include <linux/udp.h>
31 #include <linux/igmp.h>
32 #include <linux/netfilter.h>
33 #include <linux/route.h>
34 #include <linux/mroute.h>
35 #include <net/route.h>
36 #include <net/xfrm.h>
37 #include <net/compat.h>
38 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
39 #include <net/transp_v6.h>
40 #endif
41
42 #include <linux/errqueue.h>
43 #include <asm/uaccess.h>
44
45 #define IP_CMSG_PKTINFO 1
46 #define IP_CMSG_TTL 2
47 #define IP_CMSG_TOS 4
48 #define IP_CMSG_RECVOPTS 8
49 #define IP_CMSG_RETOPTS 16
50 #define IP_CMSG_PASSSEC 32
51 #define IP_CMSG_ORIGDSTADDR 64
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 = skb->rtable;
61
62 info.ipi_addr.s_addr = ip_hdr(skb)->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 = ip_hdr(skb)->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, &ip_hdr(skb)->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,
91 ip_hdr(skb) + 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 static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
131 {
132 struct sockaddr_in sin;
133 struct iphdr *iph = ip_hdr(skb);
134 __be16 *ports = (__be16 *)skb_transport_header(skb);
135
136 if (skb_transport_offset(skb) + 4 > skb->len)
137 return;
138
139 /* All current transport protocols have the port numbers in the
140 * first four bytes of the transport header and this function is
141 * written with this assumption in mind.
142 */
143
144 sin.sin_family = AF_INET;
145 sin.sin_addr.s_addr = iph->daddr;
146 sin.sin_port = ports[1];
147 memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
148
149 put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin);
150 }
151
152 void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
153 {
154 struct inet_sock *inet = inet_sk(skb->sk);
155 unsigned flags = inet->cmsg_flags;
156
157 /* Ordered by supposed usage frequency */
158 if (flags & 1)
159 ip_cmsg_recv_pktinfo(msg, skb);
160 if ((flags>>=1) == 0)
161 return;
162
163 if (flags & 1)
164 ip_cmsg_recv_ttl(msg, skb);
165 if ((flags>>=1) == 0)
166 return;
167
168 if (flags & 1)
169 ip_cmsg_recv_tos(msg, skb);
170 if ((flags>>=1) == 0)
171 return;
172
173 if (flags & 1)
174 ip_cmsg_recv_opts(msg, skb);
175 if ((flags>>=1) == 0)
176 return;
177
178 if (flags & 1)
179 ip_cmsg_recv_retopts(msg, skb);
180 if ((flags>>=1) == 0)
181 return;
182
183 if (flags & 1)
184 ip_cmsg_recv_security(msg, skb);
185
186 if ((flags>>=1) == 0)
187 return;
188 if (flags & 1)
189 ip_cmsg_recv_dstaddr(msg, skb);
190
191 }
192
193 int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc)
194 {
195 int err;
196 struct cmsghdr *cmsg;
197
198 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
199 if (!CMSG_OK(msg, cmsg))
200 return -EINVAL;
201 if (cmsg->cmsg_level != SOL_IP)
202 continue;
203 switch (cmsg->cmsg_type) {
204 case IP_RETOPTS:
205 err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
206 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg), err < 40 ? err : 40);
207 if (err)
208 return err;
209 break;
210 case IP_PKTINFO:
211 {
212 struct in_pktinfo *info;
213 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
214 return -EINVAL;
215 info = (struct in_pktinfo *)CMSG_DATA(cmsg);
216 ipc->oif = info->ipi_ifindex;
217 ipc->addr = info->ipi_spec_dst.s_addr;
218 break;
219 }
220 default:
221 return -EINVAL;
222 }
223 }
224 return 0;
225 }
226
227
228 /* Special input handler for packets caught by router alert option.
229 They are selected only by protocol field, and then processed likely
230 local ones; but only if someone wants them! Otherwise, router
231 not running rsvpd will kill RSVP.
232
233 It is user level problem, what it will make with them.
234 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
235 but receiver should be enough clever f.e. to forward mtrace requests,
236 sent to multicast group to reach destination designated router.
237 */
238 struct ip_ra_chain *ip_ra_chain;
239 DEFINE_RWLOCK(ip_ra_lock);
240
241 int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *))
242 {
243 struct ip_ra_chain *ra, *new_ra, **rap;
244
245 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num == IPPROTO_RAW)
246 return -EINVAL;
247
248 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
249
250 write_lock_bh(&ip_ra_lock);
251 for (rap = &ip_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
252 if (ra->sk == sk) {
253 if (on) {
254 write_unlock_bh(&ip_ra_lock);
255 kfree(new_ra);
256 return -EADDRINUSE;
257 }
258 *rap = ra->next;
259 write_unlock_bh(&ip_ra_lock);
260
261 if (ra->destructor)
262 ra->destructor(sk);
263 sock_put(sk);
264 kfree(ra);
265 return 0;
266 }
267 }
268 if (new_ra == NULL) {
269 write_unlock_bh(&ip_ra_lock);
270 return -ENOBUFS;
271 }
272 new_ra->sk = sk;
273 new_ra->destructor = destructor;
274
275 new_ra->next = ra;
276 *rap = new_ra;
277 sock_hold(sk);
278 write_unlock_bh(&ip_ra_lock);
279
280 return 0;
281 }
282
283 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
284 __be16 port, u32 info, u8 *payload)
285 {
286 struct inet_sock *inet = inet_sk(sk);
287 struct sock_exterr_skb *serr;
288
289 if (!inet->recverr)
290 return;
291
292 skb = skb_clone(skb, GFP_ATOMIC);
293 if (!skb)
294 return;
295
296 serr = SKB_EXT_ERR(skb);
297 serr->ee.ee_errno = err;
298 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
299 serr->ee.ee_type = icmp_hdr(skb)->type;
300 serr->ee.ee_code = icmp_hdr(skb)->code;
301 serr->ee.ee_pad = 0;
302 serr->ee.ee_info = info;
303 serr->ee.ee_data = 0;
304 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
305 skb_network_header(skb);
306 serr->port = port;
307
308 if (skb_pull(skb, payload - skb->data) != NULL) {
309 skb_reset_transport_header(skb);
310 if (sock_queue_err_skb(sk, skb) == 0)
311 return;
312 }
313 kfree_skb(skb);
314 }
315
316 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
317 {
318 struct inet_sock *inet = inet_sk(sk);
319 struct sock_exterr_skb *serr;
320 struct iphdr *iph;
321 struct sk_buff *skb;
322
323 if (!inet->recverr)
324 return;
325
326 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
327 if (!skb)
328 return;
329
330 skb_put(skb, sizeof(struct iphdr));
331 skb_reset_network_header(skb);
332 iph = ip_hdr(skb);
333 iph->daddr = daddr;
334
335 serr = SKB_EXT_ERR(skb);
336 serr->ee.ee_errno = err;
337 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
338 serr->ee.ee_type = 0;
339 serr->ee.ee_code = 0;
340 serr->ee.ee_pad = 0;
341 serr->ee.ee_info = info;
342 serr->ee.ee_data = 0;
343 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
344 serr->port = port;
345
346 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
347 skb_reset_transport_header(skb);
348
349 if (sock_queue_err_skb(sk, skb))
350 kfree_skb(skb);
351 }
352
353 /*
354 * Handle MSG_ERRQUEUE
355 */
356 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len)
357 {
358 struct sock_exterr_skb *serr;
359 struct sk_buff *skb, *skb2;
360 struct sockaddr_in *sin;
361 struct {
362 struct sock_extended_err ee;
363 struct sockaddr_in offender;
364 } errhdr;
365 int err;
366 int copied;
367
368 err = -EAGAIN;
369 skb = skb_dequeue(&sk->sk_error_queue);
370 if (skb == NULL)
371 goto out;
372
373 copied = skb->len;
374 if (copied > len) {
375 msg->msg_flags |= MSG_TRUNC;
376 copied = len;
377 }
378 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
379 if (err)
380 goto out_free_skb;
381
382 sock_recv_timestamp(msg, sk, skb);
383
384 serr = SKB_EXT_ERR(skb);
385
386 sin = (struct sockaddr_in *)msg->msg_name;
387 if (sin) {
388 sin->sin_family = AF_INET;
389 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
390 serr->addr_offset);
391 sin->sin_port = serr->port;
392 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
393 }
394
395 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
396 sin = &errhdr.offender;
397 sin->sin_family = AF_UNSPEC;
398 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
399 struct inet_sock *inet = inet_sk(sk);
400
401 sin->sin_family = AF_INET;
402 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
403 sin->sin_port = 0;
404 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
405 if (inet->cmsg_flags)
406 ip_cmsg_recv(msg, skb);
407 }
408
409 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
410
411 /* Now we could try to dump offended packet options */
412
413 msg->msg_flags |= MSG_ERRQUEUE;
414 err = copied;
415
416 /* Reset and regenerate socket error */
417 spin_lock_bh(&sk->sk_error_queue.lock);
418 sk->sk_err = 0;
419 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
420 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
421 spin_unlock_bh(&sk->sk_error_queue.lock);
422 sk->sk_error_report(sk);
423 } else
424 spin_unlock_bh(&sk->sk_error_queue.lock);
425
426 out_free_skb:
427 kfree_skb(skb);
428 out:
429 return err;
430 }
431
432
433 /*
434 * Socket option code for IP. This is the end of the line after any TCP,UDP etc options on
435 * an IP socket.
436 */
437
438 static int do_ip_setsockopt(struct sock *sk, int level,
439 int optname, char __user *optval, int optlen)
440 {
441 struct inet_sock *inet = inet_sk(sk);
442 int val = 0, err;
443
444 if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) |
445 (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) |
446 (1<<IP_RETOPTS) | (1<<IP_TOS) |
447 (1<<IP_TTL) | (1<<IP_HDRINCL) |
448 (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) |
449 (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) |
450 (1<<IP_PASSSEC) | (1<<IP_TRANSPARENT))) ||
451 optname == IP_MULTICAST_TTL ||
452 optname == IP_MULTICAST_LOOP ||
453 optname == IP_RECVORIGDSTADDR) {
454 if (optlen >= sizeof(int)) {
455 if (get_user(val, (int __user *) optval))
456 return -EFAULT;
457 } else if (optlen >= sizeof(char)) {
458 unsigned char ucval;
459
460 if (get_user(ucval, (unsigned char __user *) optval))
461 return -EFAULT;
462 val = (int) ucval;
463 }
464 }
465
466 /* If optlen==0, it is equivalent to val == 0 */
467
468 if (ip_mroute_opt(optname))
469 return ip_mroute_setsockopt(sk, optname, optval, optlen);
470
471 err = 0;
472 lock_sock(sk);
473
474 switch (optname) {
475 case IP_OPTIONS:
476 {
477 struct ip_options * opt = NULL;
478 if (optlen > 40 || optlen < 0)
479 goto e_inval;
480 err = ip_options_get_from_user(sock_net(sk), &opt,
481 optval, optlen);
482 if (err)
483 break;
484 if (inet->is_icsk) {
485 struct inet_connection_sock *icsk = inet_csk(sk);
486 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
487 if (sk->sk_family == PF_INET ||
488 (!((1 << sk->sk_state) &
489 (TCPF_LISTEN | TCPF_CLOSE)) &&
490 inet->daddr != LOOPBACK4_IPV6)) {
491 #endif
492 if (inet->opt)
493 icsk->icsk_ext_hdr_len -= inet->opt->optlen;
494 if (opt)
495 icsk->icsk_ext_hdr_len += opt->optlen;
496 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
497 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
498 }
499 #endif
500 }
501 opt = xchg(&inet->opt, opt);
502 kfree(opt);
503 break;
504 }
505 case IP_PKTINFO:
506 if (val)
507 inet->cmsg_flags |= IP_CMSG_PKTINFO;
508 else
509 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
510 break;
511 case IP_RECVTTL:
512 if (val)
513 inet->cmsg_flags |= IP_CMSG_TTL;
514 else
515 inet->cmsg_flags &= ~IP_CMSG_TTL;
516 break;
517 case IP_RECVTOS:
518 if (val)
519 inet->cmsg_flags |= IP_CMSG_TOS;
520 else
521 inet->cmsg_flags &= ~IP_CMSG_TOS;
522 break;
523 case IP_RECVOPTS:
524 if (val)
525 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
526 else
527 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
528 break;
529 case IP_RETOPTS:
530 if (val)
531 inet->cmsg_flags |= IP_CMSG_RETOPTS;
532 else
533 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
534 break;
535 case IP_PASSSEC:
536 if (val)
537 inet->cmsg_flags |= IP_CMSG_PASSSEC;
538 else
539 inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
540 break;
541 case IP_RECVORIGDSTADDR:
542 if (val)
543 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR;
544 else
545 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR;
546 break;
547 case IP_TOS: /* This sets both TOS and Precedence */
548 if (sk->sk_type == SOCK_STREAM) {
549 val &= ~3;
550 val |= inet->tos & 3;
551 }
552 if (inet->tos != val) {
553 inet->tos = val;
554 sk->sk_priority = rt_tos2priority(val);
555 sk_dst_reset(sk);
556 }
557 break;
558 case IP_TTL:
559 if (optlen<1)
560 goto e_inval;
561 if (val != -1 && (val < 1 || val>255))
562 goto e_inval;
563 inet->uc_ttl = val;
564 break;
565 case IP_HDRINCL:
566 if (sk->sk_type != SOCK_RAW) {
567 err = -ENOPROTOOPT;
568 break;
569 }
570 inet->hdrincl = val ? 1 : 0;
571 break;
572 case IP_MTU_DISCOVER:
573 if (val<0 || val>3)
574 goto e_inval;
575 inet->pmtudisc = val;
576 break;
577 case IP_RECVERR:
578 inet->recverr = !!val;
579 if (!val)
580 skb_queue_purge(&sk->sk_error_queue);
581 break;
582 case IP_MULTICAST_TTL:
583 if (sk->sk_type == SOCK_STREAM)
584 goto e_inval;
585 if (optlen<1)
586 goto e_inval;
587 if (val == -1)
588 val = 1;
589 if (val < 0 || val > 255)
590 goto e_inval;
591 inet->mc_ttl = val;
592 break;
593 case IP_MULTICAST_LOOP:
594 if (optlen<1)
595 goto e_inval;
596 inet->mc_loop = !!val;
597 break;
598 case IP_MULTICAST_IF:
599 {
600 struct ip_mreqn mreq;
601 struct net_device *dev = NULL;
602
603 if (sk->sk_type == SOCK_STREAM)
604 goto e_inval;
605 /*
606 * Check the arguments are allowable
607 */
608
609 err = -EFAULT;
610 if (optlen >= sizeof(struct ip_mreqn)) {
611 if (copy_from_user(&mreq, optval, sizeof(mreq)))
612 break;
613 } else {
614 memset(&mreq, 0, sizeof(mreq));
615 if (optlen >= sizeof(struct in_addr) &&
616 copy_from_user(&mreq.imr_address, optval, sizeof(struct in_addr)))
617 break;
618 }
619
620 if (!mreq.imr_ifindex) {
621 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
622 inet->mc_index = 0;
623 inet->mc_addr = 0;
624 err = 0;
625 break;
626 }
627 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
628 if (dev) {
629 mreq.imr_ifindex = dev->ifindex;
630 dev_put(dev);
631 }
632 } else
633 dev = __dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
634
635
636 err = -EADDRNOTAVAIL;
637 if (!dev)
638 break;
639
640 err = -EINVAL;
641 if (sk->sk_bound_dev_if &&
642 mreq.imr_ifindex != sk->sk_bound_dev_if)
643 break;
644
645 inet->mc_index = mreq.imr_ifindex;
646 inet->mc_addr = mreq.imr_address.s_addr;
647 err = 0;
648 break;
649 }
650
651 case IP_ADD_MEMBERSHIP:
652 case IP_DROP_MEMBERSHIP:
653 {
654 struct ip_mreqn mreq;
655
656 err = -EPROTO;
657 if (inet_sk(sk)->is_icsk)
658 break;
659
660 if (optlen < sizeof(struct ip_mreq))
661 goto e_inval;
662 err = -EFAULT;
663 if (optlen >= sizeof(struct ip_mreqn)) {
664 if (copy_from_user(&mreq, optval, sizeof(mreq)))
665 break;
666 } else {
667 memset(&mreq, 0, sizeof(mreq));
668 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq)))
669 break;
670 }
671
672 if (optname == IP_ADD_MEMBERSHIP)
673 err = ip_mc_join_group(sk, &mreq);
674 else
675 err = ip_mc_leave_group(sk, &mreq);
676 break;
677 }
678 case IP_MSFILTER:
679 {
680 extern int sysctl_igmp_max_msf;
681 struct ip_msfilter *msf;
682
683 if (optlen < IP_MSFILTER_SIZE(0))
684 goto e_inval;
685 if (optlen > sysctl_optmem_max) {
686 err = -ENOBUFS;
687 break;
688 }
689 msf = kmalloc(optlen, GFP_KERNEL);
690 if (!msf) {
691 err = -ENOBUFS;
692 break;
693 }
694 err = -EFAULT;
695 if (copy_from_user(msf, optval, optlen)) {
696 kfree(msf);
697 break;
698 }
699 /* numsrc >= (1G-4) overflow in 32 bits */
700 if (msf->imsf_numsrc >= 0x3ffffffcU ||
701 msf->imsf_numsrc > sysctl_igmp_max_msf) {
702 kfree(msf);
703 err = -ENOBUFS;
704 break;
705 }
706 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
707 kfree(msf);
708 err = -EINVAL;
709 break;
710 }
711 err = ip_mc_msfilter(sk, msf, 0);
712 kfree(msf);
713 break;
714 }
715 case IP_BLOCK_SOURCE:
716 case IP_UNBLOCK_SOURCE:
717 case IP_ADD_SOURCE_MEMBERSHIP:
718 case IP_DROP_SOURCE_MEMBERSHIP:
719 {
720 struct ip_mreq_source mreqs;
721 int omode, add;
722
723 if (optlen != sizeof(struct ip_mreq_source))
724 goto e_inval;
725 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
726 err = -EFAULT;
727 break;
728 }
729 if (optname == IP_BLOCK_SOURCE) {
730 omode = MCAST_EXCLUDE;
731 add = 1;
732 } else if (optname == IP_UNBLOCK_SOURCE) {
733 omode = MCAST_EXCLUDE;
734 add = 0;
735 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
736 struct ip_mreqn mreq;
737
738 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
739 mreq.imr_address.s_addr = mreqs.imr_interface;
740 mreq.imr_ifindex = 0;
741 err = ip_mc_join_group(sk, &mreq);
742 if (err && err != -EADDRINUSE)
743 break;
744 omode = MCAST_INCLUDE;
745 add = 1;
746 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
747 omode = MCAST_INCLUDE;
748 add = 0;
749 }
750 err = ip_mc_source(add, omode, sk, &mreqs, 0);
751 break;
752 }
753 case MCAST_JOIN_GROUP:
754 case MCAST_LEAVE_GROUP:
755 {
756 struct group_req greq;
757 struct sockaddr_in *psin;
758 struct ip_mreqn mreq;
759
760 if (optlen < sizeof(struct group_req))
761 goto e_inval;
762 err = -EFAULT;
763 if (copy_from_user(&greq, optval, sizeof(greq)))
764 break;
765 psin = (struct sockaddr_in *)&greq.gr_group;
766 if (psin->sin_family != AF_INET)
767 goto e_inval;
768 memset(&mreq, 0, sizeof(mreq));
769 mreq.imr_multiaddr = psin->sin_addr;
770 mreq.imr_ifindex = greq.gr_interface;
771
772 if (optname == MCAST_JOIN_GROUP)
773 err = ip_mc_join_group(sk, &mreq);
774 else
775 err = ip_mc_leave_group(sk, &mreq);
776 break;
777 }
778 case MCAST_JOIN_SOURCE_GROUP:
779 case MCAST_LEAVE_SOURCE_GROUP:
780 case MCAST_BLOCK_SOURCE:
781 case MCAST_UNBLOCK_SOURCE:
782 {
783 struct group_source_req greqs;
784 struct ip_mreq_source mreqs;
785 struct sockaddr_in *psin;
786 int omode, add;
787
788 if (optlen != sizeof(struct group_source_req))
789 goto e_inval;
790 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
791 err = -EFAULT;
792 break;
793 }
794 if (greqs.gsr_group.ss_family != AF_INET ||
795 greqs.gsr_source.ss_family != AF_INET) {
796 err = -EADDRNOTAVAIL;
797 break;
798 }
799 psin = (struct sockaddr_in *)&greqs.gsr_group;
800 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
801 psin = (struct sockaddr_in *)&greqs.gsr_source;
802 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
803 mreqs.imr_interface = 0; /* use index for mc_source */
804
805 if (optname == MCAST_BLOCK_SOURCE) {
806 omode = MCAST_EXCLUDE;
807 add = 1;
808 } else if (optname == MCAST_UNBLOCK_SOURCE) {
809 omode = MCAST_EXCLUDE;
810 add = 0;
811 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
812 struct ip_mreqn mreq;
813
814 psin = (struct sockaddr_in *)&greqs.gsr_group;
815 mreq.imr_multiaddr = psin->sin_addr;
816 mreq.imr_address.s_addr = 0;
817 mreq.imr_ifindex = greqs.gsr_interface;
818 err = ip_mc_join_group(sk, &mreq);
819 if (err && err != -EADDRINUSE)
820 break;
821 greqs.gsr_interface = mreq.imr_ifindex;
822 omode = MCAST_INCLUDE;
823 add = 1;
824 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
825 omode = MCAST_INCLUDE;
826 add = 0;
827 }
828 err = ip_mc_source(add, omode, sk, &mreqs,
829 greqs.gsr_interface);
830 break;
831 }
832 case MCAST_MSFILTER:
833 {
834 extern int sysctl_igmp_max_msf;
835 struct sockaddr_in *psin;
836 struct ip_msfilter *msf = NULL;
837 struct group_filter *gsf = NULL;
838 int msize, i, ifindex;
839
840 if (optlen < GROUP_FILTER_SIZE(0))
841 goto e_inval;
842 if (optlen > sysctl_optmem_max) {
843 err = -ENOBUFS;
844 break;
845 }
846 gsf = kmalloc(optlen, GFP_KERNEL);
847 if (!gsf) {
848 err = -ENOBUFS;
849 break;
850 }
851 err = -EFAULT;
852 if (copy_from_user(gsf, optval, optlen)) {
853 goto mc_msf_out;
854 }
855 /* numsrc >= (4G-140)/128 overflow in 32 bits */
856 if (gsf->gf_numsrc >= 0x1ffffff ||
857 gsf->gf_numsrc > sysctl_igmp_max_msf) {
858 err = -ENOBUFS;
859 goto mc_msf_out;
860 }
861 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
862 err = -EINVAL;
863 goto mc_msf_out;
864 }
865 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
866 msf = kmalloc(msize, GFP_KERNEL);
867 if (!msf) {
868 err = -ENOBUFS;
869 goto mc_msf_out;
870 }
871 ifindex = gsf->gf_interface;
872 psin = (struct sockaddr_in *)&gsf->gf_group;
873 if (psin->sin_family != AF_INET) {
874 err = -EADDRNOTAVAIL;
875 goto mc_msf_out;
876 }
877 msf->imsf_multiaddr = psin->sin_addr.s_addr;
878 msf->imsf_interface = 0;
879 msf->imsf_fmode = gsf->gf_fmode;
880 msf->imsf_numsrc = gsf->gf_numsrc;
881 err = -EADDRNOTAVAIL;
882 for (i=0; i<gsf->gf_numsrc; ++i) {
883 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
884
885 if (psin->sin_family != AF_INET)
886 goto mc_msf_out;
887 msf->imsf_slist[i] = psin->sin_addr.s_addr;
888 }
889 kfree(gsf);
890 gsf = NULL;
891
892 err = ip_mc_msfilter(sk, msf, ifindex);
893 mc_msf_out:
894 kfree(msf);
895 kfree(gsf);
896 break;
897 }
898 case IP_ROUTER_ALERT:
899 err = ip_ra_control(sk, val ? 1 : 0, NULL);
900 break;
901
902 case IP_FREEBIND:
903 if (optlen<1)
904 goto e_inval;
905 inet->freebind = !!val;
906 break;
907
908 case IP_IPSEC_POLICY:
909 case IP_XFRM_POLICY:
910 err = -EPERM;
911 if (!capable(CAP_NET_ADMIN))
912 break;
913 err = xfrm_user_policy(sk, optname, optval, optlen);
914 break;
915
916 case IP_TRANSPARENT:
917 if (!capable(CAP_NET_ADMIN)) {
918 err = -EPERM;
919 break;
920 }
921 if (optlen < 1)
922 goto e_inval;
923 inet->transparent = !!val;
924 break;
925
926 default:
927 err = -ENOPROTOOPT;
928 break;
929 }
930 release_sock(sk);
931 return err;
932
933 e_inval:
934 release_sock(sk);
935 return -EINVAL;
936 }
937
938 int ip_setsockopt(struct sock *sk, int level,
939 int optname, char __user *optval, int optlen)
940 {
941 int err;
942
943 if (level != SOL_IP)
944 return -ENOPROTOOPT;
945
946 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
947 #ifdef CONFIG_NETFILTER
948 /* we need to exclude all possible ENOPROTOOPTs except default case */
949 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
950 optname != IP_IPSEC_POLICY &&
951 optname != IP_XFRM_POLICY &&
952 !ip_mroute_opt(optname)) {
953 lock_sock(sk);
954 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
955 release_sock(sk);
956 }
957 #endif
958 return err;
959 }
960
961 #ifdef CONFIG_COMPAT
962 int compat_ip_setsockopt(struct sock *sk, int level, int optname,
963 char __user *optval, int optlen)
964 {
965 int err;
966
967 if (level != SOL_IP)
968 return -ENOPROTOOPT;
969
970 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
971 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
972 ip_setsockopt);
973
974 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
975 #ifdef CONFIG_NETFILTER
976 /* we need to exclude all possible ENOPROTOOPTs except default case */
977 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
978 optname != IP_IPSEC_POLICY &&
979 optname != IP_XFRM_POLICY &&
980 !ip_mroute_opt(optname)) {
981 lock_sock(sk);
982 err = compat_nf_setsockopt(sk, PF_INET, optname,
983 optval, optlen);
984 release_sock(sk);
985 }
986 #endif
987 return err;
988 }
989
990 EXPORT_SYMBOL(compat_ip_setsockopt);
991 #endif
992
993 /*
994 * Get the options. Note for future reference. The GET of IP options gets the
995 * _received_ ones. The set sets the _sent_ ones.
996 */
997
998 static int do_ip_getsockopt(struct sock *sk, int level, int optname,
999 char __user *optval, int __user *optlen)
1000 {
1001 struct inet_sock *inet = inet_sk(sk);
1002 int val;
1003 int len;
1004
1005 if (level != SOL_IP)
1006 return -EOPNOTSUPP;
1007
1008 if (ip_mroute_opt(optname))
1009 return ip_mroute_getsockopt(sk, optname, optval, optlen);
1010
1011 if (get_user(len, optlen))
1012 return -EFAULT;
1013 if (len < 0)
1014 return -EINVAL;
1015
1016 lock_sock(sk);
1017
1018 switch (optname) {
1019 case IP_OPTIONS:
1020 {
1021 unsigned char optbuf[sizeof(struct ip_options)+40];
1022 struct ip_options * opt = (struct ip_options *)optbuf;
1023 opt->optlen = 0;
1024 if (inet->opt)
1025 memcpy(optbuf, inet->opt,
1026 sizeof(struct ip_options)+
1027 inet->opt->optlen);
1028 release_sock(sk);
1029
1030 if (opt->optlen == 0)
1031 return put_user(0, optlen);
1032
1033 ip_options_undo(opt);
1034
1035 len = min_t(unsigned int, len, opt->optlen);
1036 if (put_user(len, optlen))
1037 return -EFAULT;
1038 if (copy_to_user(optval, opt->__data, len))
1039 return -EFAULT;
1040 return 0;
1041 }
1042 case IP_PKTINFO:
1043 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
1044 break;
1045 case IP_RECVTTL:
1046 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1047 break;
1048 case IP_RECVTOS:
1049 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1050 break;
1051 case IP_RECVOPTS:
1052 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1053 break;
1054 case IP_RETOPTS:
1055 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1056 break;
1057 case IP_PASSSEC:
1058 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1059 break;
1060 case IP_RECVORIGDSTADDR:
1061 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0;
1062 break;
1063 case IP_TOS:
1064 val = inet->tos;
1065 break;
1066 case IP_TTL:
1067 val = (inet->uc_ttl == -1 ?
1068 sysctl_ip_default_ttl :
1069 inet->uc_ttl);
1070 break;
1071 case IP_HDRINCL:
1072 val = inet->hdrincl;
1073 break;
1074 case IP_MTU_DISCOVER:
1075 val = inet->pmtudisc;
1076 break;
1077 case IP_MTU:
1078 {
1079 struct dst_entry *dst;
1080 val = 0;
1081 dst = sk_dst_get(sk);
1082 if (dst) {
1083 val = dst_mtu(dst);
1084 dst_release(dst);
1085 }
1086 if (!val) {
1087 release_sock(sk);
1088 return -ENOTCONN;
1089 }
1090 break;
1091 }
1092 case IP_RECVERR:
1093 val = inet->recverr;
1094 break;
1095 case IP_MULTICAST_TTL:
1096 val = inet->mc_ttl;
1097 break;
1098 case IP_MULTICAST_LOOP:
1099 val = inet->mc_loop;
1100 break;
1101 case IP_MULTICAST_IF:
1102 {
1103 struct in_addr addr;
1104 len = min_t(unsigned int, len, sizeof(struct in_addr));
1105 addr.s_addr = inet->mc_addr;
1106 release_sock(sk);
1107
1108 if (put_user(len, optlen))
1109 return -EFAULT;
1110 if (copy_to_user(optval, &addr, len))
1111 return -EFAULT;
1112 return 0;
1113 }
1114 case IP_MSFILTER:
1115 {
1116 struct ip_msfilter msf;
1117 int err;
1118
1119 if (len < IP_MSFILTER_SIZE(0)) {
1120 release_sock(sk);
1121 return -EINVAL;
1122 }
1123 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1124 release_sock(sk);
1125 return -EFAULT;
1126 }
1127 err = ip_mc_msfget(sk, &msf,
1128 (struct ip_msfilter __user *)optval, optlen);
1129 release_sock(sk);
1130 return err;
1131 }
1132 case MCAST_MSFILTER:
1133 {
1134 struct group_filter gsf;
1135 int err;
1136
1137 if (len < GROUP_FILTER_SIZE(0)) {
1138 release_sock(sk);
1139 return -EINVAL;
1140 }
1141 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1142 release_sock(sk);
1143 return -EFAULT;
1144 }
1145 err = ip_mc_gsfget(sk, &gsf,
1146 (struct group_filter __user *)optval, optlen);
1147 release_sock(sk);
1148 return err;
1149 }
1150 case IP_PKTOPTIONS:
1151 {
1152 struct msghdr msg;
1153
1154 release_sock(sk);
1155
1156 if (sk->sk_type != SOCK_STREAM)
1157 return -ENOPROTOOPT;
1158
1159 msg.msg_control = optval;
1160 msg.msg_controllen = len;
1161 msg.msg_flags = 0;
1162
1163 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1164 struct in_pktinfo info;
1165
1166 info.ipi_addr.s_addr = inet->rcv_saddr;
1167 info.ipi_spec_dst.s_addr = inet->rcv_saddr;
1168 info.ipi_ifindex = inet->mc_index;
1169 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1170 }
1171 if (inet->cmsg_flags & IP_CMSG_TTL) {
1172 int hlim = inet->mc_ttl;
1173 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1174 }
1175 len -= msg.msg_controllen;
1176 return put_user(len, optlen);
1177 }
1178 case IP_FREEBIND:
1179 val = inet->freebind;
1180 break;
1181 case IP_TRANSPARENT:
1182 val = inet->transparent;
1183 break;
1184 default:
1185 release_sock(sk);
1186 return -ENOPROTOOPT;
1187 }
1188 release_sock(sk);
1189
1190 if (len < sizeof(int) && len > 0 && val>=0 && val<=255) {
1191 unsigned char ucval = (unsigned char)val;
1192 len = 1;
1193 if (put_user(len, optlen))
1194 return -EFAULT;
1195 if (copy_to_user(optval, &ucval, 1))
1196 return -EFAULT;
1197 } else {
1198 len = min_t(unsigned int, sizeof(int), len);
1199 if (put_user(len, optlen))
1200 return -EFAULT;
1201 if (copy_to_user(optval, &val, len))
1202 return -EFAULT;
1203 }
1204 return 0;
1205 }
1206
1207 int ip_getsockopt(struct sock *sk, int level,
1208 int optname, char __user *optval, int __user *optlen)
1209 {
1210 int err;
1211
1212 err = do_ip_getsockopt(sk, level, optname, optval, optlen);
1213 #ifdef CONFIG_NETFILTER
1214 /* we need to exclude all possible ENOPROTOOPTs except default case */
1215 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1216 !ip_mroute_opt(optname)) {
1217 int len;
1218
1219 if (get_user(len, optlen))
1220 return -EFAULT;
1221
1222 lock_sock(sk);
1223 err = nf_getsockopt(sk, PF_INET, optname, optval,
1224 &len);
1225 release_sock(sk);
1226 if (err >= 0)
1227 err = put_user(len, optlen);
1228 return err;
1229 }
1230 #endif
1231 return err;
1232 }
1233
1234 #ifdef CONFIG_COMPAT
1235 int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1236 char __user *optval, int __user *optlen)
1237 {
1238 int err;
1239
1240 if (optname == MCAST_MSFILTER)
1241 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1242 ip_getsockopt);
1243
1244 err = do_ip_getsockopt(sk, level, optname, optval, optlen);
1245
1246 #ifdef CONFIG_NETFILTER
1247 /* we need to exclude all possible ENOPROTOOPTs except default case */
1248 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1249 !ip_mroute_opt(optname)) {
1250 int len;
1251
1252 if (get_user(len, optlen))
1253 return -EFAULT;
1254
1255 lock_sock(sk);
1256 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
1257 release_sock(sk);
1258 if (err >= 0)
1259 err = put_user(len, optlen);
1260 return err;
1261 }
1262 #endif
1263 return err;
1264 }
1265
1266 EXPORT_SYMBOL(compat_ip_getsockopt);
1267 #endif
1268
1269 EXPORT_SYMBOL(ip_cmsg_recv);
1270
1271 EXPORT_SYMBOL(ip_getsockopt);
1272 EXPORT_SYMBOL(ip_setsockopt);
Linux for Ginger Game Console