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ARM: pmu: add support for interrupt-affinity property
[linux/fpc-iii.git] / net / ipv4 / ip_sockglue.c
blob5cd99271d3a6a07c17a915fddde7a5a0c8a86618
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 #include <net/checksum.h>
41 #if IS_ENABLED(CONFIG_IPV6)
42 #include <net/transp_v6.h>
43 #endif
44 #include <net/ip_fib.h>
45
46 #include <linux/errqueue.h>
47 #include <asm/uaccess.h>
48
49 /*
50 * SOL_IP control messages.
51 */
52
53 static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
54 {
55 struct in_pktinfo info = *PKTINFO_SKB_CB(skb);
56
57 info.ipi_addr.s_addr = ip_hdr(skb)->daddr;
58
59 put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
60 }
61
62 static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
63 {
64 int ttl = ip_hdr(skb)->ttl;
65 put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
66 }
67
68 static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
69 {
70 put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos);
71 }
72
73 static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
74 {
75 if (IPCB(skb)->opt.optlen == 0)
76 return;
77
78 put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen,
79 ip_hdr(skb) + 1);
80 }
81
82
83 static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb)
84 {
85 unsigned char optbuf[sizeof(struct ip_options) + 40];
86 struct ip_options *opt = (struct ip_options *)optbuf;
87
88 if (IPCB(skb)->opt.optlen == 0)
89 return;
90
91 if (ip_options_echo(opt, skb)) {
92 msg->msg_flags |= MSG_CTRUNC;
93 return;
94 }
95 ip_options_undo(opt);
96
97 put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data);
98 }
99
100 static void ip_cmsg_recv_checksum(struct msghdr *msg, struct sk_buff *skb,
101 int offset)
102 {
103 __wsum csum = skb->csum;
104
105 if (skb->ip_summed != CHECKSUM_COMPLETE)
106 return;
107
108 if (offset != 0)
109 csum = csum_sub(csum, csum_partial(skb->data, offset, 0));
110
111 put_cmsg(msg, SOL_IP, IP_CHECKSUM, sizeof(__wsum), &csum);
112 }
113
114 static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
115 {
116 char *secdata;
117 u32 seclen, secid;
118 int err;
119
120 err = security_socket_getpeersec_dgram(NULL, skb, &secid);
121 if (err)
122 return;
123
124 err = security_secid_to_secctx(secid, &secdata, &seclen);
125 if (err)
126 return;
127
128 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
129 security_release_secctx(secdata, seclen);
130 }
131
132 static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
133 {
134 struct sockaddr_in sin;
135 const struct iphdr *iph = ip_hdr(skb);
136 __be16 *ports = (__be16 *)skb_transport_header(skb);
137
138 if (skb_transport_offset(skb) + 4 > skb->len)
139 return;
140
141 /* All current transport protocols have the port numbers in the
142 * first four bytes of the transport header and this function is
143 * written with this assumption in mind.
144 */
145
146 sin.sin_family = AF_INET;
147 sin.sin_addr.s_addr = iph->daddr;
148 sin.sin_port = ports[1];
149 memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
150
151 put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin);
152 }
153
154 void ip_cmsg_recv_offset(struct msghdr *msg, struct sk_buff *skb,
155 int offset)
156 {
157 struct inet_sock *inet = inet_sk(skb->sk);
158 unsigned int flags = inet->cmsg_flags;
159
160 /* Ordered by supposed usage frequency */
161 if (flags & IP_CMSG_PKTINFO) {
162 ip_cmsg_recv_pktinfo(msg, skb);
163
164 flags &= ~IP_CMSG_PKTINFO;
165 if (!flags)
166 return;
167 }
168
169 if (flags & IP_CMSG_TTL) {
170 ip_cmsg_recv_ttl(msg, skb);
171
172 flags &= ~IP_CMSG_TTL;
173 if (!flags)
174 return;
175 }
176
177 if (flags & IP_CMSG_TOS) {
178 ip_cmsg_recv_tos(msg, skb);
179
180 flags &= ~IP_CMSG_TOS;
181 if (!flags)
182 return;
183 }
184
185 if (flags & IP_CMSG_RECVOPTS) {
186 ip_cmsg_recv_opts(msg, skb);
187
188 flags &= ~IP_CMSG_RECVOPTS;
189 if (!flags)
190 return;
191 }
192
193 if (flags & IP_CMSG_RETOPTS) {
194 ip_cmsg_recv_retopts(msg, skb);
195
196 flags &= ~IP_CMSG_RETOPTS;
197 if (!flags)
198 return;
199 }
200
201 if (flags & IP_CMSG_PASSSEC) {
202 ip_cmsg_recv_security(msg, skb);
203
204 flags &= ~IP_CMSG_PASSSEC;
205 if (!flags)
206 return;
207 }
208
209 if (flags & IP_CMSG_ORIGDSTADDR) {
210 ip_cmsg_recv_dstaddr(msg, skb);
211
212 flags &= ~IP_CMSG_ORIGDSTADDR;
213 if (!flags)
214 return;
215 }
216
217 if (flags & IP_CMSG_CHECKSUM)
218 ip_cmsg_recv_checksum(msg, skb, offset);
219 }
220 EXPORT_SYMBOL(ip_cmsg_recv_offset);
221
222 int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc,
223 bool allow_ipv6)
224 {
225 int err, val;
226 struct cmsghdr *cmsg;
227
228 for_each_cmsghdr(cmsg, msg) {
229 if (!CMSG_OK(msg, cmsg))
230 return -EINVAL;
231 #if IS_ENABLED(CONFIG_IPV6)
232 if (allow_ipv6 &&
233 cmsg->cmsg_level == SOL_IPV6 &&
234 cmsg->cmsg_type == IPV6_PKTINFO) {
235 struct in6_pktinfo *src_info;
236
237 if (cmsg->cmsg_len < CMSG_LEN(sizeof(*src_info)))
238 return -EINVAL;
239 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
240 if (!ipv6_addr_v4mapped(&src_info->ipi6_addr))
241 return -EINVAL;
242 ipc->oif = src_info->ipi6_ifindex;
243 ipc->addr = src_info->ipi6_addr.s6_addr32[3];
244 continue;
245 }
246 #endif
247 if (cmsg->cmsg_level != SOL_IP)
248 continue;
249 switch (cmsg->cmsg_type) {
250 case IP_RETOPTS:
251 err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
252 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg),
253 err < 40 ? err : 40);
254 if (err)
255 return err;
256 break;
257 case IP_PKTINFO:
258 {
259 struct in_pktinfo *info;
260 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
261 return -EINVAL;
262 info = (struct in_pktinfo *)CMSG_DATA(cmsg);
263 ipc->oif = info->ipi_ifindex;
264 ipc->addr = info->ipi_spec_dst.s_addr;
265 break;
266 }
267 case IP_TTL:
268 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
269 return -EINVAL;
270 val = *(int *)CMSG_DATA(cmsg);
271 if (val < 1 || val > 255)
272 return -EINVAL;
273 ipc->ttl = val;
274 break;
275 case IP_TOS:
276 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
277 return -EINVAL;
278 val = *(int *)CMSG_DATA(cmsg);
279 if (val < 0 || val > 255)
280 return -EINVAL;
281 ipc->tos = val;
282 ipc->priority = rt_tos2priority(ipc->tos);
283 break;
284
285 default:
286 return -EINVAL;
287 }
288 }
289 return 0;
290 }
291
292
293 /* Special input handler for packets caught by router alert option.
294 They are selected only by protocol field, and then processed likely
295 local ones; but only if someone wants them! Otherwise, router
296 not running rsvpd will kill RSVP.
297
298 It is user level problem, what it will make with them.
299 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
300 but receiver should be enough clever f.e. to forward mtrace requests,
301 sent to multicast group to reach destination designated router.
302 */
303 struct ip_ra_chain __rcu *ip_ra_chain;
304 static DEFINE_SPINLOCK(ip_ra_lock);
305
306
307 static void ip_ra_destroy_rcu(struct rcu_head *head)
308 {
309 struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu);
310
311 sock_put(ra->saved_sk);
312 kfree(ra);
313 }
314
315 int ip_ra_control(struct sock *sk, unsigned char on,
316 void (*destructor)(struct sock *))
317 {
318 struct ip_ra_chain *ra, *new_ra;
319 struct ip_ra_chain __rcu **rap;
320
321 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW)
322 return -EINVAL;
323
324 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
325
326 spin_lock_bh(&ip_ra_lock);
327 for (rap = &ip_ra_chain;
328 (ra = rcu_dereference_protected(*rap,
329 lockdep_is_held(&ip_ra_lock))) != NULL;
330 rap = &ra->next) {
331 if (ra->sk == sk) {
332 if (on) {
333 spin_unlock_bh(&ip_ra_lock);
334 kfree(new_ra);
335 return -EADDRINUSE;
336 }
337 /* dont let ip_call_ra_chain() use sk again */
338 ra->sk = NULL;
339 RCU_INIT_POINTER(*rap, ra->next);
340 spin_unlock_bh(&ip_ra_lock);
341
342 if (ra->destructor)
343 ra->destructor(sk);
344 /*
345 * Delay sock_put(sk) and kfree(ra) after one rcu grace
346 * period. This guarantee ip_call_ra_chain() dont need
347 * to mess with socket refcounts.
348 */
349 ra->saved_sk = sk;
350 call_rcu(&ra->rcu, ip_ra_destroy_rcu);
351 return 0;
352 }
353 }
354 if (new_ra == NULL) {
355 spin_unlock_bh(&ip_ra_lock);
356 return -ENOBUFS;
357 }
358 new_ra->sk = sk;
359 new_ra->destructor = destructor;
360
361 RCU_INIT_POINTER(new_ra->next, ra);
362 rcu_assign_pointer(*rap, new_ra);
363 sock_hold(sk);
364 spin_unlock_bh(&ip_ra_lock);
365
366 return 0;
367 }
368
369 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
370 __be16 port, u32 info, u8 *payload)
371 {
372 struct sock_exterr_skb *serr;
373
374 skb = skb_clone(skb, GFP_ATOMIC);
375 if (!skb)
376 return;
377
378 serr = SKB_EXT_ERR(skb);
379 serr->ee.ee_errno = err;
380 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
381 serr->ee.ee_type = icmp_hdr(skb)->type;
382 serr->ee.ee_code = icmp_hdr(skb)->code;
383 serr->ee.ee_pad = 0;
384 serr->ee.ee_info = info;
385 serr->ee.ee_data = 0;
386 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
387 skb_network_header(skb);
388 serr->port = port;
389
390 if (skb_pull(skb, payload - skb->data) != NULL) {
391 skb_reset_transport_header(skb);
392 if (sock_queue_err_skb(sk, skb) == 0)
393 return;
394 }
395 kfree_skb(skb);
396 }
397
398 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
399 {
400 struct inet_sock *inet = inet_sk(sk);
401 struct sock_exterr_skb *serr;
402 struct iphdr *iph;
403 struct sk_buff *skb;
404
405 if (!inet->recverr)
406 return;
407
408 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
409 if (!skb)
410 return;
411
412 skb_put(skb, sizeof(struct iphdr));
413 skb_reset_network_header(skb);
414 iph = ip_hdr(skb);
415 iph->daddr = daddr;
416
417 serr = SKB_EXT_ERR(skb);
418 serr->ee.ee_errno = err;
419 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
420 serr->ee.ee_type = 0;
421 serr->ee.ee_code = 0;
422 serr->ee.ee_pad = 0;
423 serr->ee.ee_info = info;
424 serr->ee.ee_data = 0;
425 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
426 serr->port = port;
427
428 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
429 skb_reset_transport_header(skb);
430
431 if (sock_queue_err_skb(sk, skb))
432 kfree_skb(skb);
433 }
434
435 /* IPv4 supports cmsg on all imcp errors and some timestamps
436 *
437 * Timestamp code paths do not initialize the fields expected by cmsg:
438 * the PKTINFO fields in skb->cb[]. Fill those in here.
439 */
440 static bool ipv4_datagram_support_cmsg(const struct sock *sk,
441 struct sk_buff *skb,
442 int ee_origin)
443 {
444 struct in_pktinfo *info;
445
446 if (ee_origin == SO_EE_ORIGIN_ICMP)
447 return true;
448
449 if (ee_origin == SO_EE_ORIGIN_LOCAL)
450 return false;
451
452 /* Support IP_PKTINFO on tstamp packets if requested, to correlate
453 * timestamp with egress dev. Not possible for packets without dev
454 * or without payload (SOF_TIMESTAMPING_OPT_TSONLY).
455 */
456 if ((!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_CMSG)) ||
457 (!skb->dev))
458 return false;
459
460 info = PKTINFO_SKB_CB(skb);
461 info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr;
462 info->ipi_ifindex = skb->dev->ifindex;
463 return true;
464 }
465
466 /*
467 * Handle MSG_ERRQUEUE
468 */
469 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
470 {
471 struct sock_exterr_skb *serr;
472 struct sk_buff *skb;
473 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
474 struct {
475 struct sock_extended_err ee;
476 struct sockaddr_in offender;
477 } errhdr;
478 int err;
479 int copied;
480
481 WARN_ON_ONCE(sk->sk_family == AF_INET6);
482
483 err = -EAGAIN;
484 skb = sock_dequeue_err_skb(sk);
485 if (skb == NULL)
486 goto out;
487
488 copied = skb->len;
489 if (copied > len) {
490 msg->msg_flags |= MSG_TRUNC;
491 copied = len;
492 }
493 err = skb_copy_datagram_msg(skb, 0, msg, copied);
494 if (err)
495 goto out_free_skb;
496
497 sock_recv_timestamp(msg, sk, skb);
498
499 serr = SKB_EXT_ERR(skb);
500
501 if (sin && serr->port) {
502 sin->sin_family = AF_INET;
503 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
504 serr->addr_offset);
505 sin->sin_port = serr->port;
506 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
507 *addr_len = sizeof(*sin);
508 }
509
510 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
511 sin = &errhdr.offender;
512 memset(sin, 0, sizeof(*sin));
513
514 if (ipv4_datagram_support_cmsg(sk, skb, serr->ee.ee_origin)) {
515 sin->sin_family = AF_INET;
516 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
517 if (inet_sk(sk)->cmsg_flags)
518 ip_cmsg_recv(msg, skb);
519 }
520
521 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
522
523 /* Now we could try to dump offended packet options */
524
525 msg->msg_flags |= MSG_ERRQUEUE;
526 err = copied;
527
528 out_free_skb:
529 kfree_skb(skb);
530 out:
531 return err;
532 }
533
534
535 /*
536 * Socket option code for IP. This is the end of the line after any
537 * TCP,UDP etc options on an IP socket.
538 */
539
540 static int do_ip_setsockopt(struct sock *sk, int level,
541 int optname, char __user *optval, unsigned int optlen)
542 {
543 struct inet_sock *inet = inet_sk(sk);
544 int val = 0, err;
545
546 switch (optname) {
547 case IP_PKTINFO:
548 case IP_RECVTTL:
549 case IP_RECVOPTS:
550 case IP_RECVTOS:
551 case IP_RETOPTS:
552 case IP_TOS:
553 case IP_TTL:
554 case IP_HDRINCL:
555 case IP_MTU_DISCOVER:
556 case IP_RECVERR:
557 case IP_ROUTER_ALERT:
558 case IP_FREEBIND:
559 case IP_PASSSEC:
560 case IP_TRANSPARENT:
561 case IP_MINTTL:
562 case IP_NODEFRAG:
563 case IP_UNICAST_IF:
564 case IP_MULTICAST_TTL:
565 case IP_MULTICAST_ALL:
566 case IP_MULTICAST_LOOP:
567 case IP_RECVORIGDSTADDR:
568 case IP_CHECKSUM:
569 if (optlen >= sizeof(int)) {
570 if (get_user(val, (int __user *) optval))
571 return -EFAULT;
572 } else if (optlen >= sizeof(char)) {
573 unsigned char ucval;
574
575 if (get_user(ucval, (unsigned char __user *) optval))
576 return -EFAULT;
577 val = (int) ucval;
578 }
579 }
580
581 /* If optlen==0, it is equivalent to val == 0 */
582
583 if (ip_mroute_opt(optname))
584 return ip_mroute_setsockopt(sk, optname, optval, optlen);
585
586 err = 0;
587 lock_sock(sk);
588
589 switch (optname) {
590 case IP_OPTIONS:
591 {
592 struct ip_options_rcu *old, *opt = NULL;
593
594 if (optlen > 40)
595 goto e_inval;
596 err = ip_options_get_from_user(sock_net(sk), &opt,
597 optval, optlen);
598 if (err)
599 break;
600 old = rcu_dereference_protected(inet->inet_opt,
601 sock_owned_by_user(sk));
602 if (inet->is_icsk) {
603 struct inet_connection_sock *icsk = inet_csk(sk);
604 #if IS_ENABLED(CONFIG_IPV6)
605 if (sk->sk_family == PF_INET ||
606 (!((1 << sk->sk_state) &
607 (TCPF_LISTEN | TCPF_CLOSE)) &&
608 inet->inet_daddr != LOOPBACK4_IPV6)) {
609 #endif
610 if (old)
611 icsk->icsk_ext_hdr_len -= old->opt.optlen;
612 if (opt)
613 icsk->icsk_ext_hdr_len += opt->opt.optlen;
614 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
615 #if IS_ENABLED(CONFIG_IPV6)
616 }
617 #endif
618 }
619 rcu_assign_pointer(inet->inet_opt, opt);
620 if (old)
621 kfree_rcu(old, rcu);
622 break;
623 }
624 case IP_PKTINFO:
625 if (val)
626 inet->cmsg_flags |= IP_CMSG_PKTINFO;
627 else
628 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
629 break;
630 case IP_RECVTTL:
631 if (val)
632 inet->cmsg_flags |= IP_CMSG_TTL;
633 else
634 inet->cmsg_flags &= ~IP_CMSG_TTL;
635 break;
636 case IP_RECVTOS:
637 if (val)
638 inet->cmsg_flags |= IP_CMSG_TOS;
639 else
640 inet->cmsg_flags &= ~IP_CMSG_TOS;
641 break;
642 case IP_RECVOPTS:
643 if (val)
644 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
645 else
646 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
647 break;
648 case IP_RETOPTS:
649 if (val)
650 inet->cmsg_flags |= IP_CMSG_RETOPTS;
651 else
652 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
653 break;
654 case IP_PASSSEC:
655 if (val)
656 inet->cmsg_flags |= IP_CMSG_PASSSEC;
657 else
658 inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
659 break;
660 case IP_RECVORIGDSTADDR:
661 if (val)
662 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR;
663 else
664 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR;
665 break;
666 case IP_CHECKSUM:
667 if (val) {
668 if (!(inet->cmsg_flags & IP_CMSG_CHECKSUM)) {
669 inet_inc_convert_csum(sk);
670 inet->cmsg_flags |= IP_CMSG_CHECKSUM;
671 }
672 } else {
673 if (inet->cmsg_flags & IP_CMSG_CHECKSUM) {
674 inet_dec_convert_csum(sk);
675 inet->cmsg_flags &= ~IP_CMSG_CHECKSUM;
676 }
677 }
678 break;
679 case IP_TOS: /* This sets both TOS and Precedence */
680 if (sk->sk_type == SOCK_STREAM) {
681 val &= ~INET_ECN_MASK;
682 val |= inet->tos & INET_ECN_MASK;
683 }
684 if (inet->tos != val) {
685 inet->tos = val;
686 sk->sk_priority = rt_tos2priority(val);
687 sk_dst_reset(sk);
688 }
689 break;
690 case IP_TTL:
691 if (optlen < 1)
692 goto e_inval;
693 if (val != -1 && (val < 1 || val > 255))
694 goto e_inval;
695 inet->uc_ttl = val;
696 break;
697 case IP_HDRINCL:
698 if (sk->sk_type != SOCK_RAW) {
699 err = -ENOPROTOOPT;
700 break;
701 }
702 inet->hdrincl = val ? 1 : 0;
703 break;
704 case IP_NODEFRAG:
705 if (sk->sk_type != SOCK_RAW) {
706 err = -ENOPROTOOPT;
707 break;
708 }
709 inet->nodefrag = val ? 1 : 0;
710 break;
711 case IP_MTU_DISCOVER:
712 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT)
713 goto e_inval;
714 inet->pmtudisc = val;
715 break;
716 case IP_RECVERR:
717 inet->recverr = !!val;
718 if (!val)
719 skb_queue_purge(&sk->sk_error_queue);
720 break;
721 case IP_MULTICAST_TTL:
722 if (sk->sk_type == SOCK_STREAM)
723 goto e_inval;
724 if (optlen < 1)
725 goto e_inval;
726 if (val == -1)
727 val = 1;
728 if (val < 0 || val > 255)
729 goto e_inval;
730 inet->mc_ttl = val;
731 break;
732 case IP_MULTICAST_LOOP:
733 if (optlen < 1)
734 goto e_inval;
735 inet->mc_loop = !!val;
736 break;
737 case IP_UNICAST_IF:
738 {
739 struct net_device *dev = NULL;
740 int ifindex;
741
742 if (optlen != sizeof(int))
743 goto e_inval;
744
745 ifindex = (__force int)ntohl((__force __be32)val);
746 if (ifindex == 0) {
747 inet->uc_index = 0;
748 err = 0;
749 break;
750 }
751
752 dev = dev_get_by_index(sock_net(sk), ifindex);
753 err = -EADDRNOTAVAIL;
754 if (!dev)
755 break;
756 dev_put(dev);
757
758 err = -EINVAL;
759 if (sk->sk_bound_dev_if)
760 break;
761
762 inet->uc_index = ifindex;
763 err = 0;
764 break;
765 }
766 case IP_MULTICAST_IF:
767 {
768 struct ip_mreqn mreq;
769 struct net_device *dev = NULL;
770
771 if (sk->sk_type == SOCK_STREAM)
772 goto e_inval;
773 /*
774 * Check the arguments are allowable
775 */
776
777 if (optlen < sizeof(struct in_addr))
778 goto e_inval;
779
780 err = -EFAULT;
781 if (optlen >= sizeof(struct ip_mreqn)) {
782 if (copy_from_user(&mreq, optval, sizeof(mreq)))
783 break;
784 } else {
785 memset(&mreq, 0, sizeof(mreq));
786 if (optlen >= sizeof(struct ip_mreq)) {
787 if (copy_from_user(&mreq, optval,
788 sizeof(struct ip_mreq)))
789 break;
790 } else if (optlen >= sizeof(struct in_addr)) {
791 if (copy_from_user(&mreq.imr_address, optval,
792 sizeof(struct in_addr)))
793 break;
794 }
795 }
796
797 if (!mreq.imr_ifindex) {
798 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
799 inet->mc_index = 0;
800 inet->mc_addr = 0;
801 err = 0;
802 break;
803 }
804 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
805 if (dev)
806 mreq.imr_ifindex = dev->ifindex;
807 } else
808 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
809
810
811 err = -EADDRNOTAVAIL;
812 if (!dev)
813 break;
814 dev_put(dev);
815
816 err = -EINVAL;
817 if (sk->sk_bound_dev_if &&
818 mreq.imr_ifindex != sk->sk_bound_dev_if)
819 break;
820
821 inet->mc_index = mreq.imr_ifindex;
822 inet->mc_addr = mreq.imr_address.s_addr;
823 err = 0;
824 break;
825 }
826
827 case IP_ADD_MEMBERSHIP:
828 case IP_DROP_MEMBERSHIP:
829 {
830 struct ip_mreqn mreq;
831
832 err = -EPROTO;
833 if (inet_sk(sk)->is_icsk)
834 break;
835
836 if (optlen < sizeof(struct ip_mreq))
837 goto e_inval;
838 err = -EFAULT;
839 if (optlen >= sizeof(struct ip_mreqn)) {
840 if (copy_from_user(&mreq, optval, sizeof(mreq)))
841 break;
842 } else {
843 memset(&mreq, 0, sizeof(mreq));
844 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq)))
845 break;
846 }
847
848 if (optname == IP_ADD_MEMBERSHIP)
849 err = ip_mc_join_group(sk, &mreq);
850 else
851 err = ip_mc_leave_group(sk, &mreq);
852 break;
853 }
854 case IP_MSFILTER:
855 {
856 struct ip_msfilter *msf;
857
858 if (optlen < IP_MSFILTER_SIZE(0))
859 goto e_inval;
860 if (optlen > sysctl_optmem_max) {
861 err = -ENOBUFS;
862 break;
863 }
864 msf = kmalloc(optlen, GFP_KERNEL);
865 if (!msf) {
866 err = -ENOBUFS;
867 break;
868 }
869 err = -EFAULT;
870 if (copy_from_user(msf, optval, optlen)) {
871 kfree(msf);
872 break;
873 }
874 /* numsrc >= (1G-4) overflow in 32 bits */
875 if (msf->imsf_numsrc >= 0x3ffffffcU ||
876 msf->imsf_numsrc > sysctl_igmp_max_msf) {
877 kfree(msf);
878 err = -ENOBUFS;
879 break;
880 }
881 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
882 kfree(msf);
883 err = -EINVAL;
884 break;
885 }
886 err = ip_mc_msfilter(sk, msf, 0);
887 kfree(msf);
888 break;
889 }
890 case IP_BLOCK_SOURCE:
891 case IP_UNBLOCK_SOURCE:
892 case IP_ADD_SOURCE_MEMBERSHIP:
893 case IP_DROP_SOURCE_MEMBERSHIP:
894 {
895 struct ip_mreq_source mreqs;
896 int omode, add;
897
898 if (optlen != sizeof(struct ip_mreq_source))
899 goto e_inval;
900 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
901 err = -EFAULT;
902 break;
903 }
904 if (optname == IP_BLOCK_SOURCE) {
905 omode = MCAST_EXCLUDE;
906 add = 1;
907 } else if (optname == IP_UNBLOCK_SOURCE) {
908 omode = MCAST_EXCLUDE;
909 add = 0;
910 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
911 struct ip_mreqn mreq;
912
913 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
914 mreq.imr_address.s_addr = mreqs.imr_interface;
915 mreq.imr_ifindex = 0;
916 err = ip_mc_join_group(sk, &mreq);
917 if (err && err != -EADDRINUSE)
918 break;
919 omode = MCAST_INCLUDE;
920 add = 1;
921 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
922 omode = MCAST_INCLUDE;
923 add = 0;
924 }
925 err = ip_mc_source(add, omode, sk, &mreqs, 0);
926 break;
927 }
928 case MCAST_JOIN_GROUP:
929 case MCAST_LEAVE_GROUP:
930 {
931 struct group_req greq;
932 struct sockaddr_in *psin;
933 struct ip_mreqn mreq;
934
935 if (optlen < sizeof(struct group_req))
936 goto e_inval;
937 err = -EFAULT;
938 if (copy_from_user(&greq, optval, sizeof(greq)))
939 break;
940 psin = (struct sockaddr_in *)&greq.gr_group;
941 if (psin->sin_family != AF_INET)
942 goto e_inval;
943 memset(&mreq, 0, sizeof(mreq));
944 mreq.imr_multiaddr = psin->sin_addr;
945 mreq.imr_ifindex = greq.gr_interface;
946
947 if (optname == MCAST_JOIN_GROUP)
948 err = ip_mc_join_group(sk, &mreq);
949 else
950 err = ip_mc_leave_group(sk, &mreq);
951 break;
952 }
953 case MCAST_JOIN_SOURCE_GROUP:
954 case MCAST_LEAVE_SOURCE_GROUP:
955 case MCAST_BLOCK_SOURCE:
956 case MCAST_UNBLOCK_SOURCE:
957 {
958 struct group_source_req greqs;
959 struct ip_mreq_source mreqs;
960 struct sockaddr_in *psin;
961 int omode, add;
962
963 if (optlen != sizeof(struct group_source_req))
964 goto e_inval;
965 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
966 err = -EFAULT;
967 break;
968 }
969 if (greqs.gsr_group.ss_family != AF_INET ||
970 greqs.gsr_source.ss_family != AF_INET) {
971 err = -EADDRNOTAVAIL;
972 break;
973 }
974 psin = (struct sockaddr_in *)&greqs.gsr_group;
975 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
976 psin = (struct sockaddr_in *)&greqs.gsr_source;
977 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
978 mreqs.imr_interface = 0; /* use index for mc_source */
979
980 if (optname == MCAST_BLOCK_SOURCE) {
981 omode = MCAST_EXCLUDE;
982 add = 1;
983 } else if (optname == MCAST_UNBLOCK_SOURCE) {
984 omode = MCAST_EXCLUDE;
985 add = 0;
986 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
987 struct ip_mreqn mreq;
988
989 psin = (struct sockaddr_in *)&greqs.gsr_group;
990 mreq.imr_multiaddr = psin->sin_addr;
991 mreq.imr_address.s_addr = 0;
992 mreq.imr_ifindex = greqs.gsr_interface;
993 err = ip_mc_join_group(sk, &mreq);
994 if (err && err != -EADDRINUSE)
995 break;
996 greqs.gsr_interface = mreq.imr_ifindex;
997 omode = MCAST_INCLUDE;
998 add = 1;
999 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
1000 omode = MCAST_INCLUDE;
1001 add = 0;
1002 }
1003 err = ip_mc_source(add, omode, sk, &mreqs,
1004 greqs.gsr_interface);
1005 break;
1006 }
1007 case MCAST_MSFILTER:
1008 {
1009 struct sockaddr_in *psin;
1010 struct ip_msfilter *msf = NULL;
1011 struct group_filter *gsf = NULL;
1012 int msize, i, ifindex;
1013
1014 if (optlen < GROUP_FILTER_SIZE(0))
1015 goto e_inval;
1016 if (optlen > sysctl_optmem_max) {
1017 err = -ENOBUFS;
1018 break;
1019 }
1020 gsf = kmalloc(optlen, GFP_KERNEL);
1021 if (!gsf) {
1022 err = -ENOBUFS;
1023 break;
1024 }
1025 err = -EFAULT;
1026 if (copy_from_user(gsf, optval, optlen))
1027 goto mc_msf_out;
1028
1029 /* numsrc >= (4G-140)/128 overflow in 32 bits */
1030 if (gsf->gf_numsrc >= 0x1ffffff ||
1031 gsf->gf_numsrc > sysctl_igmp_max_msf) {
1032 err = -ENOBUFS;
1033 goto mc_msf_out;
1034 }
1035 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
1036 err = -EINVAL;
1037 goto mc_msf_out;
1038 }
1039 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
1040 msf = kmalloc(msize, GFP_KERNEL);
1041 if (!msf) {
1042 err = -ENOBUFS;
1043 goto mc_msf_out;
1044 }
1045 ifindex = gsf->gf_interface;
1046 psin = (struct sockaddr_in *)&gsf->gf_group;
1047 if (psin->sin_family != AF_INET) {
1048 err = -EADDRNOTAVAIL;
1049 goto mc_msf_out;
1050 }
1051 msf->imsf_multiaddr = psin->sin_addr.s_addr;
1052 msf->imsf_interface = 0;
1053 msf->imsf_fmode = gsf->gf_fmode;
1054 msf->imsf_numsrc = gsf->gf_numsrc;
1055 err = -EADDRNOTAVAIL;
1056 for (i = 0; i < gsf->gf_numsrc; ++i) {
1057 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
1058
1059 if (psin->sin_family != AF_INET)
1060 goto mc_msf_out;
1061 msf->imsf_slist[i] = psin->sin_addr.s_addr;
1062 }
1063 kfree(gsf);
1064 gsf = NULL;
1065
1066 err = ip_mc_msfilter(sk, msf, ifindex);
1067 mc_msf_out:
1068 kfree(msf);
1069 kfree(gsf);
1070 break;
1071 }
1072 case IP_MULTICAST_ALL:
1073 if (optlen < 1)
1074 goto e_inval;
1075 if (val != 0 && val != 1)
1076 goto e_inval;
1077 inet->mc_all = val;
1078 break;
1079 case IP_ROUTER_ALERT:
1080 err = ip_ra_control(sk, val ? 1 : 0, NULL);
1081 break;
1082
1083 case IP_FREEBIND:
1084 if (optlen < 1)
1085 goto e_inval;
1086 inet->freebind = !!val;
1087 break;
1088
1089 case IP_IPSEC_POLICY:
1090 case IP_XFRM_POLICY:
1091 err = -EPERM;
1092 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1093 break;
1094 err = xfrm_user_policy(sk, optname, optval, optlen);
1095 break;
1096
1097 case IP_TRANSPARENT:
1098 if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) &&
1099 !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
1100 err = -EPERM;
1101 break;
1102 }
1103 if (optlen < 1)
1104 goto e_inval;
1105 inet->transparent = !!val;
1106 break;
1107
1108 case IP_MINTTL:
1109 if (optlen < 1)
1110 goto e_inval;
1111 if (val < 0 || val > 255)
1112 goto e_inval;
1113 inet->min_ttl = val;
1114 break;
1115
1116 default:
1117 err = -ENOPROTOOPT;
1118 break;
1119 }
1120 release_sock(sk);
1121 return err;
1122
1123 e_inval:
1124 release_sock(sk);
1125 return -EINVAL;
1126 }
1127
1128 /**
1129 * ipv4_pktinfo_prepare - transfer some info from rtable to skb
1130 * @sk: socket
1131 * @skb: buffer
1132 *
1133 * To support IP_CMSG_PKTINFO option, we store rt_iif and specific
1134 * destination in skb->cb[] before dst drop.
1135 * This way, receiver doesn't make cache line misses to read rtable.
1136 */
1137 void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb)
1138 {
1139 struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb);
1140 bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) ||
1141 ipv6_sk_rxinfo(sk);
1142
1143 if (prepare && skb_rtable(skb)) {
1144 pktinfo->ipi_ifindex = inet_iif(skb);
1145 pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb);
1146 } else {
1147 pktinfo->ipi_ifindex = 0;
1148 pktinfo->ipi_spec_dst.s_addr = 0;
1149 }
1150 skb_dst_drop(skb);
1151 }
1152
1153 int ip_setsockopt(struct sock *sk, int level,
1154 int optname, char __user *optval, unsigned int optlen)
1155 {
1156 int err;
1157
1158 if (level != SOL_IP)
1159 return -ENOPROTOOPT;
1160
1161 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1162 #ifdef CONFIG_NETFILTER
1163 /* we need to exclude all possible ENOPROTOOPTs except default case */
1164 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
1165 optname != IP_IPSEC_POLICY &&
1166 optname != IP_XFRM_POLICY &&
1167 !ip_mroute_opt(optname)) {
1168 lock_sock(sk);
1169 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
1170 release_sock(sk);
1171 }
1172 #endif
1173 return err;
1174 }
1175 EXPORT_SYMBOL(ip_setsockopt);
1176
1177 #ifdef CONFIG_COMPAT
1178 int compat_ip_setsockopt(struct sock *sk, int level, int optname,
1179 char __user *optval, unsigned int optlen)
1180 {
1181 int err;
1182
1183 if (level != SOL_IP)
1184 return -ENOPROTOOPT;
1185
1186 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
1187 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
1188 ip_setsockopt);
1189
1190 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1191 #ifdef CONFIG_NETFILTER
1192 /* we need to exclude all possible ENOPROTOOPTs except default case */
1193 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
1194 optname != IP_IPSEC_POLICY &&
1195 optname != IP_XFRM_POLICY &&
1196 !ip_mroute_opt(optname)) {
1197 lock_sock(sk);
1198 err = compat_nf_setsockopt(sk, PF_INET, optname,
1199 optval, optlen);
1200 release_sock(sk);
1201 }
1202 #endif
1203 return err;
1204 }
1205 EXPORT_SYMBOL(compat_ip_setsockopt);
1206 #endif
1207
1208 /*
1209 * Get the options. Note for future reference. The GET of IP options gets
1210 * the _received_ ones. The set sets the _sent_ ones.
1211 */
1212
1213 static int do_ip_getsockopt(struct sock *sk, int level, int optname,
1214 char __user *optval, int __user *optlen, unsigned int flags)
1215 {
1216 struct inet_sock *inet = inet_sk(sk);
1217 int val;
1218 int len;
1219
1220 if (level != SOL_IP)
1221 return -EOPNOTSUPP;
1222
1223 if (ip_mroute_opt(optname))
1224 return ip_mroute_getsockopt(sk, optname, optval, optlen);
1225
1226 if (get_user(len, optlen))
1227 return -EFAULT;
1228 if (len < 0)
1229 return -EINVAL;
1230
1231 lock_sock(sk);
1232
1233 switch (optname) {
1234 case IP_OPTIONS:
1235 {
1236 unsigned char optbuf[sizeof(struct ip_options)+40];
1237 struct ip_options *opt = (struct ip_options *)optbuf;
1238 struct ip_options_rcu *inet_opt;
1239
1240 inet_opt = rcu_dereference_protected(inet->inet_opt,
1241 sock_owned_by_user(sk));
1242 opt->optlen = 0;
1243 if (inet_opt)
1244 memcpy(optbuf, &inet_opt->opt,
1245 sizeof(struct ip_options) +
1246 inet_opt->opt.optlen);
1247 release_sock(sk);
1248
1249 if (opt->optlen == 0)
1250 return put_user(0, optlen);
1251
1252 ip_options_undo(opt);
1253
1254 len = min_t(unsigned int, len, opt->optlen);
1255 if (put_user(len, optlen))
1256 return -EFAULT;
1257 if (copy_to_user(optval, opt->__data, len))
1258 return -EFAULT;
1259 return 0;
1260 }
1261 case IP_PKTINFO:
1262 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
1263 break;
1264 case IP_RECVTTL:
1265 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1266 break;
1267 case IP_RECVTOS:
1268 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1269 break;
1270 case IP_RECVOPTS:
1271 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1272 break;
1273 case IP_RETOPTS:
1274 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1275 break;
1276 case IP_PASSSEC:
1277 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1278 break;
1279 case IP_RECVORIGDSTADDR:
1280 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0;
1281 break;
1282 case IP_CHECKSUM:
1283 val = (inet->cmsg_flags & IP_CMSG_CHECKSUM) != 0;
1284 break;
1285 case IP_TOS:
1286 val = inet->tos;
1287 break;
1288 case IP_TTL:
1289 val = (inet->uc_ttl == -1 ?
1290 sysctl_ip_default_ttl :
1291 inet->uc_ttl);
1292 break;
1293 case IP_HDRINCL:
1294 val = inet->hdrincl;
1295 break;
1296 case IP_NODEFRAG:
1297 val = inet->nodefrag;
1298 break;
1299 case IP_MTU_DISCOVER:
1300 val = inet->pmtudisc;
1301 break;
1302 case IP_MTU:
1303 {
1304 struct dst_entry *dst;
1305 val = 0;
1306 dst = sk_dst_get(sk);
1307 if (dst) {
1308 val = dst_mtu(dst);
1309 dst_release(dst);
1310 }
1311 if (!val) {
1312 release_sock(sk);
1313 return -ENOTCONN;
1314 }
1315 break;
1316 }
1317 case IP_RECVERR:
1318 val = inet->recverr;
1319 break;
1320 case IP_MULTICAST_TTL:
1321 val = inet->mc_ttl;
1322 break;
1323 case IP_MULTICAST_LOOP:
1324 val = inet->mc_loop;
1325 break;
1326 case IP_UNICAST_IF:
1327 val = (__force int)htonl((__u32) inet->uc_index);
1328 break;
1329 case IP_MULTICAST_IF:
1330 {
1331 struct in_addr addr;
1332 len = min_t(unsigned int, len, sizeof(struct in_addr));
1333 addr.s_addr = inet->mc_addr;
1334 release_sock(sk);
1335
1336 if (put_user(len, optlen))
1337 return -EFAULT;
1338 if (copy_to_user(optval, &addr, len))
1339 return -EFAULT;
1340 return 0;
1341 }
1342 case IP_MSFILTER:
1343 {
1344 struct ip_msfilter msf;
1345 int err;
1346
1347 if (len < IP_MSFILTER_SIZE(0)) {
1348 release_sock(sk);
1349 return -EINVAL;
1350 }
1351 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1352 release_sock(sk);
1353 return -EFAULT;
1354 }
1355 err = ip_mc_msfget(sk, &msf,
1356 (struct ip_msfilter __user *)optval, optlen);
1357 release_sock(sk);
1358 return err;
1359 }
1360 case MCAST_MSFILTER:
1361 {
1362 struct group_filter gsf;
1363 int err;
1364
1365 if (len < GROUP_FILTER_SIZE(0)) {
1366 release_sock(sk);
1367 return -EINVAL;
1368 }
1369 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1370 release_sock(sk);
1371 return -EFAULT;
1372 }
1373 err = ip_mc_gsfget(sk, &gsf,
1374 (struct group_filter __user *)optval,
1375 optlen);
1376 release_sock(sk);
1377 return err;
1378 }
1379 case IP_MULTICAST_ALL:
1380 val = inet->mc_all;
1381 break;
1382 case IP_PKTOPTIONS:
1383 {
1384 struct msghdr msg;
1385
1386 release_sock(sk);
1387
1388 if (sk->sk_type != SOCK_STREAM)
1389 return -ENOPROTOOPT;
1390
1391 msg.msg_control = (__force void *) optval;
1392 msg.msg_controllen = len;
1393 msg.msg_flags = flags;
1394
1395 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1396 struct in_pktinfo info;
1397
1398 info.ipi_addr.s_addr = inet->inet_rcv_saddr;
1399 info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr;
1400 info.ipi_ifindex = inet->mc_index;
1401 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1402 }
1403 if (inet->cmsg_flags & IP_CMSG_TTL) {
1404 int hlim = inet->mc_ttl;
1405 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1406 }
1407 if (inet->cmsg_flags & IP_CMSG_TOS) {
1408 int tos = inet->rcv_tos;
1409 put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos);
1410 }
1411 len -= msg.msg_controllen;
1412 return put_user(len, optlen);
1413 }
1414 case IP_FREEBIND:
1415 val = inet->freebind;
1416 break;
1417 case IP_TRANSPARENT:
1418 val = inet->transparent;
1419 break;
1420 case IP_MINTTL:
1421 val = inet->min_ttl;
1422 break;
1423 default:
1424 release_sock(sk);
1425 return -ENOPROTOOPT;
1426 }
1427 release_sock(sk);
1428
1429 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) {
1430 unsigned char ucval = (unsigned char)val;
1431 len = 1;
1432 if (put_user(len, optlen))
1433 return -EFAULT;
1434 if (copy_to_user(optval, &ucval, 1))
1435 return -EFAULT;
1436 } else {
1437 len = min_t(unsigned int, sizeof(int), len);
1438 if (put_user(len, optlen))
1439 return -EFAULT;
1440 if (copy_to_user(optval, &val, len))
1441 return -EFAULT;
1442 }
1443 return 0;
1444 }
1445
1446 int ip_getsockopt(struct sock *sk, int level,
1447 int optname, char __user *optval, int __user *optlen)
1448 {
1449 int err;
1450
1451 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0);
1452 #ifdef CONFIG_NETFILTER
1453 /* we need to exclude all possible ENOPROTOOPTs except default case */
1454 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1455 !ip_mroute_opt(optname)) {
1456 int len;
1457
1458 if (get_user(len, optlen))
1459 return -EFAULT;
1460
1461 lock_sock(sk);
1462 err = nf_getsockopt(sk, PF_INET, optname, optval,
1463 &len);
1464 release_sock(sk);
1465 if (err >= 0)
1466 err = put_user(len, optlen);
1467 return err;
1468 }
1469 #endif
1470 return err;
1471 }
1472 EXPORT_SYMBOL(ip_getsockopt);
1473
1474 #ifdef CONFIG_COMPAT
1475 int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1476 char __user *optval, int __user *optlen)
1477 {
1478 int err;
1479
1480 if (optname == MCAST_MSFILTER)
1481 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1482 ip_getsockopt);
1483
1484 err = do_ip_getsockopt(sk, level, optname, optval, optlen,
1485 MSG_CMSG_COMPAT);
1486
1487 #ifdef CONFIG_NETFILTER
1488 /* we need to exclude all possible ENOPROTOOPTs except default case */
1489 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1490 !ip_mroute_opt(optname)) {
1491 int len;
1492
1493 if (get_user(len, optlen))
1494 return -EFAULT;
1495
1496 lock_sock(sk);
1497 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
1498 release_sock(sk);
1499 if (err >= 0)
1500 err = put_user(len, optlen);
1501 return err;
1502 }
1503 #endif
1504 return err;
1505 }
1506 EXPORT_SYMBOL(compat_ip_getsockopt);
1507 #endif
Linux with added FPC-III support