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Adding support for MOXA ART SoC. Testing port of linux-2.6.32.60-moxart.
[linux-3.6.7-moxart.git] / net / ipv4 / ip_sockglue.c
blob5eea4a811042adaf3df8e65308c2aeeb23c845e9
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 <linux/slab.h>
27 #include <net/sock.h>
28 #include <net/ip.h>
29 #include <net/icmp.h>
30 #include <net/tcp_states.h>
31 #include <linux/udp.h>
32 #include <linux/igmp.h>
33 #include <linux/netfilter.h>
34 #include <linux/route.h>
35 #include <linux/mroute.h>
36 #include <net/inet_ecn.h>
37 #include <net/route.h>
38 #include <net/xfrm.h>
39 #include <net/compat.h>
40 #if IS_ENABLED(CONFIG_IPV6)
41 #include <net/transp_v6.h>
42 #endif
43 #include <net/ip_fib.h>
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 #define IP_CMSG_PASSSEC 32
54 #define IP_CMSG_ORIGDSTADDR 64
55
56 /*
57 * SOL_IP control messages.
58 */
59 #define PKTINFO_SKB_CB(__skb) ((struct in_pktinfo *)((__skb)->cb))
60
61 static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
62 {
63 struct in_pktinfo info = *PKTINFO_SKB_CB(skb);
64
65 info.ipi_addr.s_addr = ip_hdr(skb)->daddr;
66
67 put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
68 }
69
70 static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
71 {
72 int ttl = ip_hdr(skb)->ttl;
73 put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
74 }
75
76 static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
77 {
78 put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos);
79 }
80
81 static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
82 {
83 if (IPCB(skb)->opt.optlen == 0)
84 return;
85
86 put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen,
87 ip_hdr(skb) + 1);
88 }
89
90
91 static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb)
92 {
93 unsigned char optbuf[sizeof(struct ip_options) + 40];
94 struct ip_options *opt = (struct ip_options *)optbuf;
95
96 if (IPCB(skb)->opt.optlen == 0)
97 return;
98
99 if (ip_options_echo(opt, skb)) {
100 msg->msg_flags |= MSG_CTRUNC;
101 return;
102 }
103 ip_options_undo(opt);
104
105 put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data);
106 }
107
108 static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
109 {
110 char *secdata;
111 u32 seclen, secid;
112 int err;
113
114 err = security_socket_getpeersec_dgram(NULL, skb, &secid);
115 if (err)
116 return;
117
118 err = security_secid_to_secctx(secid, &secdata, &seclen);
119 if (err)
120 return;
121
122 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
123 security_release_secctx(secdata, seclen);
124 }
125
126 static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
127 {
128 struct sockaddr_in sin;
129 const struct iphdr *iph = ip_hdr(skb);
130 __be16 *ports = (__be16 *)skb_transport_header(skb);
131
132 if (skb_transport_offset(skb) + 4 > skb->len)
133 return;
134
135 /* All current transport protocols have the port numbers in the
136 * first four bytes of the transport header and this function is
137 * written with this assumption in mind.
138 */
139
140 sin.sin_family = AF_INET;
141 sin.sin_addr.s_addr = iph->daddr;
142 sin.sin_port = ports[1];
143 memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
144
145 put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin);
146 }
147
148 void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
149 {
150 struct inet_sock *inet = inet_sk(skb->sk);
151 unsigned int flags = inet->cmsg_flags;
152
153 /* Ordered by supposed usage frequency */
154 if (flags & 1)
155 ip_cmsg_recv_pktinfo(msg, skb);
156 if ((flags >>= 1) == 0)
157 return;
158
159 if (flags & 1)
160 ip_cmsg_recv_ttl(msg, skb);
161 if ((flags >>= 1) == 0)
162 return;
163
164 if (flags & 1)
165 ip_cmsg_recv_tos(msg, skb);
166 if ((flags >>= 1) == 0)
167 return;
168
169 if (flags & 1)
170 ip_cmsg_recv_opts(msg, skb);
171 if ((flags >>= 1) == 0)
172 return;
173
174 if (flags & 1)
175 ip_cmsg_recv_retopts(msg, skb);
176 if ((flags >>= 1) == 0)
177 return;
178
179 if (flags & 1)
180 ip_cmsg_recv_security(msg, skb);
181
182 if ((flags >>= 1) == 0)
183 return;
184 if (flags & 1)
185 ip_cmsg_recv_dstaddr(msg, skb);
186
187 }
188 EXPORT_SYMBOL(ip_cmsg_recv);
189
190 int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc)
191 {
192 int err;
193 struct cmsghdr *cmsg;
194
195 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
196 if (!CMSG_OK(msg, cmsg))
197 return -EINVAL;
198 if (cmsg->cmsg_level != SOL_IP)
199 continue;
200 switch (cmsg->cmsg_type) {
201 case IP_RETOPTS:
202 err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
203 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg),
204 err < 40 ? err : 40);
205 if (err)
206 return err;
207 break;
208 case IP_PKTINFO:
209 {
210 struct in_pktinfo *info;
211 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
212 return -EINVAL;
213 info = (struct in_pktinfo *)CMSG_DATA(cmsg);
214 ipc->oif = info->ipi_ifindex;
215 ipc->addr = info->ipi_spec_dst.s_addr;
216 break;
217 }
218 default:
219 return -EINVAL;
220 }
221 }
222 return 0;
223 }
224
225
226 /* Special input handler for packets caught by router alert option.
227 They are selected only by protocol field, and then processed likely
228 local ones; but only if someone wants them! Otherwise, router
229 not running rsvpd will kill RSVP.
230
231 It is user level problem, what it will make with them.
232 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
233 but receiver should be enough clever f.e. to forward mtrace requests,
234 sent to multicast group to reach destination designated router.
235 */
236 struct ip_ra_chain __rcu *ip_ra_chain;
237 static DEFINE_SPINLOCK(ip_ra_lock);
238
239
240 static void ip_ra_destroy_rcu(struct rcu_head *head)
241 {
242 struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu);
243
244 sock_put(ra->saved_sk);
245 kfree(ra);
246 }
247
248 int ip_ra_control(struct sock *sk, unsigned char on,
249 void (*destructor)(struct sock *))
250 {
251 struct ip_ra_chain *ra, *new_ra;
252 struct ip_ra_chain __rcu **rap;
253
254 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW)
255 return -EINVAL;
256
257 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
258
259 spin_lock_bh(&ip_ra_lock);
260 for (rap = &ip_ra_chain;
261 (ra = rcu_dereference_protected(*rap,
262 lockdep_is_held(&ip_ra_lock))) != NULL;
263 rap = &ra->next) {
264 if (ra->sk == sk) {
265 if (on) {
266 spin_unlock_bh(&ip_ra_lock);
267 kfree(new_ra);
268 return -EADDRINUSE;
269 }
270 /* dont let ip_call_ra_chain() use sk again */
271 ra->sk = NULL;
272 rcu_assign_pointer(*rap, ra->next);
273 spin_unlock_bh(&ip_ra_lock);
274
275 if (ra->destructor)
276 ra->destructor(sk);
277 /*
278 * Delay sock_put(sk) and kfree(ra) after one rcu grace
279 * period. This guarantee ip_call_ra_chain() dont need
280 * to mess with socket refcounts.
281 */
282 ra->saved_sk = sk;
283 call_rcu(&ra->rcu, ip_ra_destroy_rcu);
284 return 0;
285 }
286 }
287 if (new_ra == NULL) {
288 spin_unlock_bh(&ip_ra_lock);
289 return -ENOBUFS;
290 }
291 new_ra->sk = sk;
292 new_ra->destructor = destructor;
293
294 new_ra->next = ra;
295 rcu_assign_pointer(*rap, new_ra);
296 sock_hold(sk);
297 spin_unlock_bh(&ip_ra_lock);
298
299 return 0;
300 }
301
302 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
303 __be16 port, u32 info, u8 *payload)
304 {
305 struct sock_exterr_skb *serr;
306
307 skb = skb_clone(skb, GFP_ATOMIC);
308 if (!skb)
309 return;
310
311 serr = SKB_EXT_ERR(skb);
312 serr->ee.ee_errno = err;
313 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
314 serr->ee.ee_type = icmp_hdr(skb)->type;
315 serr->ee.ee_code = icmp_hdr(skb)->code;
316 serr->ee.ee_pad = 0;
317 serr->ee.ee_info = info;
318 serr->ee.ee_data = 0;
319 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
320 skb_network_header(skb);
321 serr->port = port;
322
323 if (skb_pull(skb, payload - skb->data) != NULL) {
324 skb_reset_transport_header(skb);
325 if (sock_queue_err_skb(sk, skb) == 0)
326 return;
327 }
328 kfree_skb(skb);
329 }
330
331 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
332 {
333 struct inet_sock *inet = inet_sk(sk);
334 struct sock_exterr_skb *serr;
335 struct iphdr *iph;
336 struct sk_buff *skb;
337
338 if (!inet->recverr)
339 return;
340
341 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
342 if (!skb)
343 return;
344
345 skb_put(skb, sizeof(struct iphdr));
346 skb_reset_network_header(skb);
347 iph = ip_hdr(skb);
348 iph->daddr = daddr;
349
350 serr = SKB_EXT_ERR(skb);
351 serr->ee.ee_errno = err;
352 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
353 serr->ee.ee_type = 0;
354 serr->ee.ee_code = 0;
355 serr->ee.ee_pad = 0;
356 serr->ee.ee_info = info;
357 serr->ee.ee_data = 0;
358 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
359 serr->port = port;
360
361 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
362 skb_reset_transport_header(skb);
363
364 if (sock_queue_err_skb(sk, skb))
365 kfree_skb(skb);
366 }
367
368 /*
369 * Handle MSG_ERRQUEUE
370 */
371 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len)
372 {
373 struct sock_exterr_skb *serr;
374 struct sk_buff *skb, *skb2;
375 struct sockaddr_in *sin;
376 struct {
377 struct sock_extended_err ee;
378 struct sockaddr_in offender;
379 } errhdr;
380 int err;
381 int copied;
382
383 err = -EAGAIN;
384 skb = skb_dequeue(&sk->sk_error_queue);
385 if (skb == NULL)
386 goto out;
387
388 copied = skb->len;
389 if (copied > len) {
390 msg->msg_flags |= MSG_TRUNC;
391 copied = len;
392 }
393 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
394 if (err)
395 goto out_free_skb;
396
397 sock_recv_timestamp(msg, sk, skb);
398
399 serr = SKB_EXT_ERR(skb);
400
401 sin = (struct sockaddr_in *)msg->msg_name;
402 if (sin) {
403 sin->sin_family = AF_INET;
404 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
405 serr->addr_offset);
406 sin->sin_port = serr->port;
407 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
408 }
409
410 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
411 sin = &errhdr.offender;
412 sin->sin_family = AF_UNSPEC;
413 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
414 struct inet_sock *inet = inet_sk(sk);
415
416 sin->sin_family = AF_INET;
417 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
418 sin->sin_port = 0;
419 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
420 if (inet->cmsg_flags)
421 ip_cmsg_recv(msg, skb);
422 }
423
424 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
425
426 /* Now we could try to dump offended packet options */
427
428 msg->msg_flags |= MSG_ERRQUEUE;
429 err = copied;
430
431 /* Reset and regenerate socket error */
432 spin_lock_bh(&sk->sk_error_queue.lock);
433 sk->sk_err = 0;
434 skb2 = skb_peek(&sk->sk_error_queue);
435 if (skb2 != NULL) {
436 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
437 spin_unlock_bh(&sk->sk_error_queue.lock);
438 sk->sk_error_report(sk);
439 } else
440 spin_unlock_bh(&sk->sk_error_queue.lock);
441
442 out_free_skb:
443 kfree_skb(skb);
444 out:
445 return err;
446 }
447
448
449 /*
450 * Socket option code for IP. This is the end of the line after any
451 * TCP,UDP etc options on an IP socket.
452 */
453
454 static int do_ip_setsockopt(struct sock *sk, int level,
455 int optname, char __user *optval, unsigned int optlen)
456 {
457 struct inet_sock *inet = inet_sk(sk);
458 int val = 0, err;
459
460 if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) |
461 (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) |
462 (1<<IP_RETOPTS) | (1<<IP_TOS) |
463 (1<<IP_TTL) | (1<<IP_HDRINCL) |
464 (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) |
465 (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) |
466 (1<<IP_PASSSEC) | (1<<IP_TRANSPARENT) |
467 (1<<IP_MINTTL) | (1<<IP_NODEFRAG))) ||
468 optname == IP_UNICAST_IF ||
469 optname == IP_MULTICAST_TTL ||
470 optname == IP_MULTICAST_ALL ||
471 optname == IP_MULTICAST_LOOP ||
472 optname == IP_RECVORIGDSTADDR) {
473 if (optlen >= sizeof(int)) {
474 if (get_user(val, (int __user *) optval))
475 return -EFAULT;
476 } else if (optlen >= sizeof(char)) {
477 unsigned char ucval;
478
479 if (get_user(ucval, (unsigned char __user *) optval))
480 return -EFAULT;
481 val = (int) ucval;
482 }
483 }
484
485 /* If optlen==0, it is equivalent to val == 0 */
486
487 if (ip_mroute_opt(optname))
488 return ip_mroute_setsockopt(sk, optname, optval, optlen);
489
490 err = 0;
491 lock_sock(sk);
492
493 switch (optname) {
494 case IP_OPTIONS:
495 {
496 struct ip_options_rcu *old, *opt = NULL;
497
498 if (optlen > 40)
499 goto e_inval;
500 err = ip_options_get_from_user(sock_net(sk), &opt,
501 optval, optlen);
502 if (err)
503 break;
504 old = rcu_dereference_protected(inet->inet_opt,
505 sock_owned_by_user(sk));
506 if (inet->is_icsk) {
507 struct inet_connection_sock *icsk = inet_csk(sk);
508 #if IS_ENABLED(CONFIG_IPV6)
509 if (sk->sk_family == PF_INET ||
510 (!((1 << sk->sk_state) &
511 (TCPF_LISTEN | TCPF_CLOSE)) &&
512 inet->inet_daddr != LOOPBACK4_IPV6)) {
513 #endif
514 if (old)
515 icsk->icsk_ext_hdr_len -= old->opt.optlen;
516 if (opt)
517 icsk->icsk_ext_hdr_len += opt->opt.optlen;
518 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
519 #if IS_ENABLED(CONFIG_IPV6)
520 }
521 #endif
522 }
523 rcu_assign_pointer(inet->inet_opt, opt);
524 if (old)
525 kfree_rcu(old, rcu);
526 break;
527 }
528 case IP_PKTINFO:
529 if (val)
530 inet->cmsg_flags |= IP_CMSG_PKTINFO;
531 else
532 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
533 break;
534 case IP_RECVTTL:
535 if (val)
536 inet->cmsg_flags |= IP_CMSG_TTL;
537 else
538 inet->cmsg_flags &= ~IP_CMSG_TTL;
539 break;
540 case IP_RECVTOS:
541 if (val)
542 inet->cmsg_flags |= IP_CMSG_TOS;
543 else
544 inet->cmsg_flags &= ~IP_CMSG_TOS;
545 break;
546 case IP_RECVOPTS:
547 if (val)
548 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
549 else
550 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
551 break;
552 case IP_RETOPTS:
553 if (val)
554 inet->cmsg_flags |= IP_CMSG_RETOPTS;
555 else
556 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
557 break;
558 case IP_PASSSEC:
559 if (val)
560 inet->cmsg_flags |= IP_CMSG_PASSSEC;
561 else
562 inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
563 break;
564 case IP_RECVORIGDSTADDR:
565 if (val)
566 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR;
567 else
568 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR;
569 break;
570 case IP_TOS: /* This sets both TOS and Precedence */
571 if (sk->sk_type == SOCK_STREAM) {
572 val &= ~INET_ECN_MASK;
573 val |= inet->tos & INET_ECN_MASK;
574 }
575 if (inet->tos != val) {
576 inet->tos = val;
577 sk->sk_priority = rt_tos2priority(val);
578 sk_dst_reset(sk);
579 }
580 break;
581 case IP_TTL:
582 if (optlen < 1)
583 goto e_inval;
584 if (val != -1 && (val < 0 || val > 255))
585 goto e_inval;
586 inet->uc_ttl = val;
587 break;
588 case IP_HDRINCL:
589 if (sk->sk_type != SOCK_RAW) {
590 err = -ENOPROTOOPT;
591 break;
592 }
593 inet->hdrincl = val ? 1 : 0;
594 break;
595 case IP_NODEFRAG:
596 if (sk->sk_type != SOCK_RAW) {
597 err = -ENOPROTOOPT;
598 break;
599 }
600 inet->nodefrag = val ? 1 : 0;
601 break;
602 case IP_MTU_DISCOVER:
603 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_PROBE)
604 goto e_inval;
605 inet->pmtudisc = val;
606 break;
607 case IP_RECVERR:
608 inet->recverr = !!val;
609 if (!val)
610 skb_queue_purge(&sk->sk_error_queue);
611 break;
612 case IP_MULTICAST_TTL:
613 if (sk->sk_type == SOCK_STREAM)
614 goto e_inval;
615 if (optlen < 1)
616 goto e_inval;
617 if (val == -1)
618 val = 1;
619 if (val < 0 || val > 255)
620 goto e_inval;
621 inet->mc_ttl = val;
622 break;
623 case IP_MULTICAST_LOOP:
624 if (optlen < 1)
625 goto e_inval;
626 inet->mc_loop = !!val;
627 break;
628 case IP_UNICAST_IF:
629 {
630 struct net_device *dev = NULL;
631 int ifindex;
632
633 if (optlen != sizeof(int))
634 goto e_inval;
635
636 ifindex = (__force int)ntohl((__force __be32)val);
637 if (ifindex == 0) {
638 inet->uc_index = 0;
639 err = 0;
640 break;
641 }
642
643 dev = dev_get_by_index(sock_net(sk), ifindex);
644 err = -EADDRNOTAVAIL;
645 if (!dev)
646 break;
647 dev_put(dev);
648
649 err = -EINVAL;
650 if (sk->sk_bound_dev_if)
651 break;
652
653 inet->uc_index = ifindex;
654 err = 0;
655 break;
656 }
657 case IP_MULTICAST_IF:
658 {
659 struct ip_mreqn mreq;
660 struct net_device *dev = NULL;
661
662 if (sk->sk_type == SOCK_STREAM)
663 goto e_inval;
664 /*
665 * Check the arguments are allowable
666 */
667
668 if (optlen < sizeof(struct in_addr))
669 goto e_inval;
670
671 err = -EFAULT;
672 if (optlen >= sizeof(struct ip_mreqn)) {
673 if (copy_from_user(&mreq, optval, sizeof(mreq)))
674 break;
675 } else {
676 memset(&mreq, 0, sizeof(mreq));
677 if (optlen >= sizeof(struct ip_mreq)) {
678 if (copy_from_user(&mreq, optval,
679 sizeof(struct ip_mreq)))
680 break;
681 } else if (optlen >= sizeof(struct in_addr)) {
682 if (copy_from_user(&mreq.imr_address, optval,
683 sizeof(struct in_addr)))
684 break;
685 }
686 }
687
688 if (!mreq.imr_ifindex) {
689 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
690 inet->mc_index = 0;
691 inet->mc_addr = 0;
692 err = 0;
693 break;
694 }
695 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
696 if (dev)
697 mreq.imr_ifindex = dev->ifindex;
698 } else
699 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
700
701
702 err = -EADDRNOTAVAIL;
703 if (!dev)
704 break;
705 dev_put(dev);
706
707 err = -EINVAL;
708 if (sk->sk_bound_dev_if &&
709 mreq.imr_ifindex != sk->sk_bound_dev_if)
710 break;
711
712 inet->mc_index = mreq.imr_ifindex;
713 inet->mc_addr = mreq.imr_address.s_addr;
714 err = 0;
715 break;
716 }
717
718 case IP_ADD_MEMBERSHIP:
719 case IP_DROP_MEMBERSHIP:
720 {
721 struct ip_mreqn mreq;
722
723 err = -EPROTO;
724 if (inet_sk(sk)->is_icsk)
725 break;
726
727 if (optlen < sizeof(struct ip_mreq))
728 goto e_inval;
729 err = -EFAULT;
730 if (optlen >= sizeof(struct ip_mreqn)) {
731 if (copy_from_user(&mreq, optval, sizeof(mreq)))
732 break;
733 } else {
734 memset(&mreq, 0, sizeof(mreq));
735 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq)))
736 break;
737 }
738
739 if (optname == IP_ADD_MEMBERSHIP)
740 err = ip_mc_join_group(sk, &mreq);
741 else
742 err = ip_mc_leave_group(sk, &mreq);
743 break;
744 }
745 case IP_MSFILTER:
746 {
747 struct ip_msfilter *msf;
748
749 if (optlen < IP_MSFILTER_SIZE(0))
750 goto e_inval;
751 if (optlen > sysctl_optmem_max) {
752 err = -ENOBUFS;
753 break;
754 }
755 msf = kmalloc(optlen, GFP_KERNEL);
756 if (!msf) {
757 err = -ENOBUFS;
758 break;
759 }
760 err = -EFAULT;
761 if (copy_from_user(msf, optval, optlen)) {
762 kfree(msf);
763 break;
764 }
765 /* numsrc >= (1G-4) overflow in 32 bits */
766 if (msf->imsf_numsrc >= 0x3ffffffcU ||
767 msf->imsf_numsrc > sysctl_igmp_max_msf) {
768 kfree(msf);
769 err = -ENOBUFS;
770 break;
771 }
772 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
773 kfree(msf);
774 err = -EINVAL;
775 break;
776 }
777 err = ip_mc_msfilter(sk, msf, 0);
778 kfree(msf);
779 break;
780 }
781 case IP_BLOCK_SOURCE:
782 case IP_UNBLOCK_SOURCE:
783 case IP_ADD_SOURCE_MEMBERSHIP:
784 case IP_DROP_SOURCE_MEMBERSHIP:
785 {
786 struct ip_mreq_source mreqs;
787 int omode, add;
788
789 if (optlen != sizeof(struct ip_mreq_source))
790 goto e_inval;
791 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
792 err = -EFAULT;
793 break;
794 }
795 if (optname == IP_BLOCK_SOURCE) {
796 omode = MCAST_EXCLUDE;
797 add = 1;
798 } else if (optname == IP_UNBLOCK_SOURCE) {
799 omode = MCAST_EXCLUDE;
800 add = 0;
801 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
802 struct ip_mreqn mreq;
803
804 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
805 mreq.imr_address.s_addr = mreqs.imr_interface;
806 mreq.imr_ifindex = 0;
807 err = ip_mc_join_group(sk, &mreq);
808 if (err && err != -EADDRINUSE)
809 break;
810 omode = MCAST_INCLUDE;
811 add = 1;
812 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
813 omode = MCAST_INCLUDE;
814 add = 0;
815 }
816 err = ip_mc_source(add, omode, sk, &mreqs, 0);
817 break;
818 }
819 case MCAST_JOIN_GROUP:
820 case MCAST_LEAVE_GROUP:
821 {
822 struct group_req greq;
823 struct sockaddr_in *psin;
824 struct ip_mreqn mreq;
825
826 if (optlen < sizeof(struct group_req))
827 goto e_inval;
828 err = -EFAULT;
829 if (copy_from_user(&greq, optval, sizeof(greq)))
830 break;
831 psin = (struct sockaddr_in *)&greq.gr_group;
832 if (psin->sin_family != AF_INET)
833 goto e_inval;
834 memset(&mreq, 0, sizeof(mreq));
835 mreq.imr_multiaddr = psin->sin_addr;
836 mreq.imr_ifindex = greq.gr_interface;
837
838 if (optname == MCAST_JOIN_GROUP)
839 err = ip_mc_join_group(sk, &mreq);
840 else
841 err = ip_mc_leave_group(sk, &mreq);
842 break;
843 }
844 case MCAST_JOIN_SOURCE_GROUP:
845 case MCAST_LEAVE_SOURCE_GROUP:
846 case MCAST_BLOCK_SOURCE:
847 case MCAST_UNBLOCK_SOURCE:
848 {
849 struct group_source_req greqs;
850 struct ip_mreq_source mreqs;
851 struct sockaddr_in *psin;
852 int omode, add;
853
854 if (optlen != sizeof(struct group_source_req))
855 goto e_inval;
856 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
857 err = -EFAULT;
858 break;
859 }
860 if (greqs.gsr_group.ss_family != AF_INET ||
861 greqs.gsr_source.ss_family != AF_INET) {
862 err = -EADDRNOTAVAIL;
863 break;
864 }
865 psin = (struct sockaddr_in *)&greqs.gsr_group;
866 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
867 psin = (struct sockaddr_in *)&greqs.gsr_source;
868 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
869 mreqs.imr_interface = 0; /* use index for mc_source */
870
871 if (optname == MCAST_BLOCK_SOURCE) {
872 omode = MCAST_EXCLUDE;
873 add = 1;
874 } else if (optname == MCAST_UNBLOCK_SOURCE) {
875 omode = MCAST_EXCLUDE;
876 add = 0;
877 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
878 struct ip_mreqn mreq;
879
880 psin = (struct sockaddr_in *)&greqs.gsr_group;
881 mreq.imr_multiaddr = psin->sin_addr;
882 mreq.imr_address.s_addr = 0;
883 mreq.imr_ifindex = greqs.gsr_interface;
884 err = ip_mc_join_group(sk, &mreq);
885 if (err && err != -EADDRINUSE)
886 break;
887 greqs.gsr_interface = mreq.imr_ifindex;
888 omode = MCAST_INCLUDE;
889 add = 1;
890 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
891 omode = MCAST_INCLUDE;
892 add = 0;
893 }
894 err = ip_mc_source(add, omode, sk, &mreqs,
895 greqs.gsr_interface);
896 break;
897 }
898 case MCAST_MSFILTER:
899 {
900 struct sockaddr_in *psin;
901 struct ip_msfilter *msf = NULL;
902 struct group_filter *gsf = NULL;
903 int msize, i, ifindex;
904
905 if (optlen < GROUP_FILTER_SIZE(0))
906 goto e_inval;
907 if (optlen > sysctl_optmem_max) {
908 err = -ENOBUFS;
909 break;
910 }
911 gsf = kmalloc(optlen, GFP_KERNEL);
912 if (!gsf) {
913 err = -ENOBUFS;
914 break;
915 }
916 err = -EFAULT;
917 if (copy_from_user(gsf, optval, optlen))
918 goto mc_msf_out;
919
920 /* numsrc >= (4G-140)/128 overflow in 32 bits */
921 if (gsf->gf_numsrc >= 0x1ffffff ||
922 gsf->gf_numsrc > sysctl_igmp_max_msf) {
923 err = -ENOBUFS;
924 goto mc_msf_out;
925 }
926 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
927 err = -EINVAL;
928 goto mc_msf_out;
929 }
930 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
931 msf = kmalloc(msize, GFP_KERNEL);
932 if (!msf) {
933 err = -ENOBUFS;
934 goto mc_msf_out;
935 }
936 ifindex = gsf->gf_interface;
937 psin = (struct sockaddr_in *)&gsf->gf_group;
938 if (psin->sin_family != AF_INET) {
939 err = -EADDRNOTAVAIL;
940 goto mc_msf_out;
941 }
942 msf->imsf_multiaddr = psin->sin_addr.s_addr;
943 msf->imsf_interface = 0;
944 msf->imsf_fmode = gsf->gf_fmode;
945 msf->imsf_numsrc = gsf->gf_numsrc;
946 err = -EADDRNOTAVAIL;
947 for (i = 0; i < gsf->gf_numsrc; ++i) {
948 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
949
950 if (psin->sin_family != AF_INET)
951 goto mc_msf_out;
952 msf->imsf_slist[i] = psin->sin_addr.s_addr;
953 }
954 kfree(gsf);
955 gsf = NULL;
956
957 err = ip_mc_msfilter(sk, msf, ifindex);
958 mc_msf_out:
959 kfree(msf);
960 kfree(gsf);
961 break;
962 }
963 case IP_MULTICAST_ALL:
964 if (optlen < 1)
965 goto e_inval;
966 if (val != 0 && val != 1)
967 goto e_inval;
968 inet->mc_all = val;
969 break;
970 case IP_ROUTER_ALERT:
971 err = ip_ra_control(sk, val ? 1 : 0, NULL);
972 break;
973
974 case IP_FREEBIND:
975 if (optlen < 1)
976 goto e_inval;
977 inet->freebind = !!val;
978 break;
979
980 case IP_IPSEC_POLICY:
981 case IP_XFRM_POLICY:
982 err = -EPERM;
983 if (!capable(CAP_NET_ADMIN))
984 break;
985 err = xfrm_user_policy(sk, optname, optval, optlen);
986 break;
987
988 case IP_TRANSPARENT:
989 if (!!val && !capable(CAP_NET_RAW) && !capable(CAP_NET_ADMIN)) {
990 err = -EPERM;
991 break;
992 }
993 if (optlen < 1)
994 goto e_inval;
995 inet->transparent = !!val;
996 break;
997
998 case IP_MINTTL:
999 if (optlen < 1)
1000 goto e_inval;
1001 if (val < 0 || val > 255)
1002 goto e_inval;
1003 inet->min_ttl = val;
1004 break;
1005
1006 default:
1007 err = -ENOPROTOOPT;
1008 break;
1009 }
1010 release_sock(sk);
1011 return err;
1012
1013 e_inval:
1014 release_sock(sk);
1015 return -EINVAL;
1016 }
1017
1018 /**
1019 * ipv4_pktinfo_prepare - transfert some info from rtable to skb
1020 * @sk: socket
1021 * @skb: buffer
1022 *
1023 * To support IP_CMSG_PKTINFO option, we store rt_iif and specific
1024 * destination in skb->cb[] before dst drop.
1025 * This way, receiver doesnt make cache line misses to read rtable.
1026 */
1027 void ipv4_pktinfo_prepare(struct sk_buff *skb)
1028 {
1029 struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb);
1030
1031 if (skb_rtable(skb)) {
1032 pktinfo->ipi_ifindex = inet_iif(skb);
1033 pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb);
1034 } else {
1035 pktinfo->ipi_ifindex = 0;
1036 pktinfo->ipi_spec_dst.s_addr = 0;
1037 }
1038 skb_dst_drop(skb);
1039 }
1040
1041 int ip_setsockopt(struct sock *sk, int level,
1042 int optname, char __user *optval, unsigned int optlen)
1043 {
1044 int err;
1045
1046 if (level != SOL_IP)
1047 return -ENOPROTOOPT;
1048
1049 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1050 #ifdef CONFIG_NETFILTER
1051 /* we need to exclude all possible ENOPROTOOPTs except default case */
1052 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
1053 optname != IP_IPSEC_POLICY &&
1054 optname != IP_XFRM_POLICY &&
1055 !ip_mroute_opt(optname)) {
1056 lock_sock(sk);
1057 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
1058 release_sock(sk);
1059 }
1060 #endif
1061 return err;
1062 }
1063 EXPORT_SYMBOL(ip_setsockopt);
1064
1065 #ifdef CONFIG_COMPAT
1066 int compat_ip_setsockopt(struct sock *sk, int level, int optname,
1067 char __user *optval, unsigned int optlen)
1068 {
1069 int err;
1070
1071 if (level != SOL_IP)
1072 return -ENOPROTOOPT;
1073
1074 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
1075 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
1076 ip_setsockopt);
1077
1078 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1079 #ifdef CONFIG_NETFILTER
1080 /* we need to exclude all possible ENOPROTOOPTs except default case */
1081 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
1082 optname != IP_IPSEC_POLICY &&
1083 optname != IP_XFRM_POLICY &&
1084 !ip_mroute_opt(optname)) {
1085 lock_sock(sk);
1086 err = compat_nf_setsockopt(sk, PF_INET, optname,
1087 optval, optlen);
1088 release_sock(sk);
1089 }
1090 #endif
1091 return err;
1092 }
1093 EXPORT_SYMBOL(compat_ip_setsockopt);
1094 #endif
1095
1096 /*
1097 * Get the options. Note for future reference. The GET of IP options gets
1098 * the _received_ ones. The set sets the _sent_ ones.
1099 */
1100
1101 static int do_ip_getsockopt(struct sock *sk, int level, int optname,
1102 char __user *optval, int __user *optlen, unsigned int flags)
1103 {
1104 struct inet_sock *inet = inet_sk(sk);
1105 int val;
1106 int len;
1107
1108 if (level != SOL_IP)
1109 return -EOPNOTSUPP;
1110
1111 if (ip_mroute_opt(optname))
1112 return ip_mroute_getsockopt(sk, optname, optval, optlen);
1113
1114 if (get_user(len, optlen))
1115 return -EFAULT;
1116 if (len < 0)
1117 return -EINVAL;
1118
1119 lock_sock(sk);
1120
1121 switch (optname) {
1122 case IP_OPTIONS:
1123 {
1124 unsigned char optbuf[sizeof(struct ip_options)+40];
1125 struct ip_options *opt = (struct ip_options *)optbuf;
1126 struct ip_options_rcu *inet_opt;
1127
1128 inet_opt = rcu_dereference_protected(inet->inet_opt,
1129 sock_owned_by_user(sk));
1130 opt->optlen = 0;
1131 if (inet_opt)
1132 memcpy(optbuf, &inet_opt->opt,
1133 sizeof(struct ip_options) +
1134 inet_opt->opt.optlen);
1135 release_sock(sk);
1136
1137 if (opt->optlen == 0)
1138 return put_user(0, optlen);
1139
1140 ip_options_undo(opt);
1141
1142 len = min_t(unsigned int, len, opt->optlen);
1143 if (put_user(len, optlen))
1144 return -EFAULT;
1145 if (copy_to_user(optval, opt->__data, len))
1146 return -EFAULT;
1147 return 0;
1148 }
1149 case IP_PKTINFO:
1150 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
1151 break;
1152 case IP_RECVTTL:
1153 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1154 break;
1155 case IP_RECVTOS:
1156 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1157 break;
1158 case IP_RECVOPTS:
1159 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1160 break;
1161 case IP_RETOPTS:
1162 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1163 break;
1164 case IP_PASSSEC:
1165 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1166 break;
1167 case IP_RECVORIGDSTADDR:
1168 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0;
1169 break;
1170 case IP_TOS:
1171 val = inet->tos;
1172 break;
1173 case IP_TTL:
1174 val = (inet->uc_ttl == -1 ?
1175 sysctl_ip_default_ttl :
1176 inet->uc_ttl);
1177 break;
1178 case IP_HDRINCL:
1179 val = inet->hdrincl;
1180 break;
1181 case IP_NODEFRAG:
1182 val = inet->nodefrag;
1183 break;
1184 case IP_MTU_DISCOVER:
1185 val = inet->pmtudisc;
1186 break;
1187 case IP_MTU:
1188 {
1189 struct dst_entry *dst;
1190 val = 0;
1191 dst = sk_dst_get(sk);
1192 if (dst) {
1193 val = dst_mtu(dst);
1194 dst_release(dst);
1195 }
1196 if (!val) {
1197 release_sock(sk);
1198 return -ENOTCONN;
1199 }
1200 break;
1201 }
1202 case IP_RECVERR:
1203 val = inet->recverr;
1204 break;
1205 case IP_MULTICAST_TTL:
1206 val = inet->mc_ttl;
1207 break;
1208 case IP_MULTICAST_LOOP:
1209 val = inet->mc_loop;
1210 break;
1211 case IP_UNICAST_IF:
1212 val = (__force int)htonl((__u32) inet->uc_index);
1213 break;
1214 case IP_MULTICAST_IF:
1215 {
1216 struct in_addr addr;
1217 len = min_t(unsigned int, len, sizeof(struct in_addr));
1218 addr.s_addr = inet->mc_addr;
1219 release_sock(sk);
1220
1221 if (put_user(len, optlen))
1222 return -EFAULT;
1223 if (copy_to_user(optval, &addr, len))
1224 return -EFAULT;
1225 return 0;
1226 }
1227 case IP_MSFILTER:
1228 {
1229 struct ip_msfilter msf;
1230 int err;
1231
1232 if (len < IP_MSFILTER_SIZE(0)) {
1233 release_sock(sk);
1234 return -EINVAL;
1235 }
1236 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1237 release_sock(sk);
1238 return -EFAULT;
1239 }
1240 err = ip_mc_msfget(sk, &msf,
1241 (struct ip_msfilter __user *)optval, optlen);
1242 release_sock(sk);
1243 return err;
1244 }
1245 case MCAST_MSFILTER:
1246 {
1247 struct group_filter gsf;
1248 int err;
1249
1250 if (len < GROUP_FILTER_SIZE(0)) {
1251 release_sock(sk);
1252 return -EINVAL;
1253 }
1254 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1255 release_sock(sk);
1256 return -EFAULT;
1257 }
1258 err = ip_mc_gsfget(sk, &gsf,
1259 (struct group_filter __user *)optval,
1260 optlen);
1261 release_sock(sk);
1262 return err;
1263 }
1264 case IP_MULTICAST_ALL:
1265 val = inet->mc_all;
1266 break;
1267 case IP_PKTOPTIONS:
1268 {
1269 struct msghdr msg;
1270
1271 release_sock(sk);
1272
1273 if (sk->sk_type != SOCK_STREAM)
1274 return -ENOPROTOOPT;
1275
1276 msg.msg_control = optval;
1277 msg.msg_controllen = len;
1278 msg.msg_flags = flags;
1279
1280 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1281 struct in_pktinfo info;
1282
1283 info.ipi_addr.s_addr = inet->inet_rcv_saddr;
1284 info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr;
1285 info.ipi_ifindex = inet->mc_index;
1286 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1287 }
1288 if (inet->cmsg_flags & IP_CMSG_TTL) {
1289 int hlim = inet->mc_ttl;
1290 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1291 }
1292 if (inet->cmsg_flags & IP_CMSG_TOS) {
1293 int tos = inet->rcv_tos;
1294 put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos);
1295 }
1296 len -= msg.msg_controllen;
1297 return put_user(len, optlen);
1298 }
1299 case IP_FREEBIND:
1300 val = inet->freebind;
1301 break;
1302 case IP_TRANSPARENT:
1303 val = inet->transparent;
1304 break;
1305 case IP_MINTTL:
1306 val = inet->min_ttl;
1307 break;
1308 default:
1309 release_sock(sk);
1310 return -ENOPROTOOPT;
1311 }
1312 release_sock(sk);
1313
1314 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) {
1315 unsigned char ucval = (unsigned char)val;
1316 len = 1;
1317 if (put_user(len, optlen))
1318 return -EFAULT;
1319 if (copy_to_user(optval, &ucval, 1))
1320 return -EFAULT;
1321 } else {
1322 len = min_t(unsigned int, sizeof(int), len);
1323 if (put_user(len, optlen))
1324 return -EFAULT;
1325 if (copy_to_user(optval, &val, len))
1326 return -EFAULT;
1327 }
1328 return 0;
1329 }
1330
1331 int ip_getsockopt(struct sock *sk, int level,
1332 int optname, char __user *optval, int __user *optlen)
1333 {
1334 int err;
1335
1336 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0);
1337 #ifdef CONFIG_NETFILTER
1338 /* we need to exclude all possible ENOPROTOOPTs except default case */
1339 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1340 !ip_mroute_opt(optname)) {
1341 int len;
1342
1343 if (get_user(len, optlen))
1344 return -EFAULT;
1345
1346 lock_sock(sk);
1347 err = nf_getsockopt(sk, PF_INET, optname, optval,
1348 &len);
1349 release_sock(sk);
1350 if (err >= 0)
1351 err = put_user(len, optlen);
1352 return err;
1353 }
1354 #endif
1355 return err;
1356 }
1357 EXPORT_SYMBOL(ip_getsockopt);
1358
1359 #ifdef CONFIG_COMPAT
1360 int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1361 char __user *optval, int __user *optlen)
1362 {
1363 int err;
1364
1365 if (optname == MCAST_MSFILTER)
1366 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1367 ip_getsockopt);
1368
1369 err = do_ip_getsockopt(sk, level, optname, optval, optlen,
1370 MSG_CMSG_COMPAT);
1371
1372 #ifdef CONFIG_NETFILTER
1373 /* we need to exclude all possible ENOPROTOOPTs except default case */
1374 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1375 !ip_mroute_opt(optname)) {
1376 int len;
1377
1378 if (get_user(len, optlen))
1379 return -EFAULT;
1380
1381 lock_sock(sk);
1382 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
1383 release_sock(sk);
1384 if (err >= 0)
1385 err = put_user(len, optlen);
1386 return err;
1387 }
1388 #endif
1389 return err;
1390 }
1391 EXPORT_SYMBOL(compat_ip_getsockopt);
1392 #endif
Linux ARM platform port for MOXA ART SoC