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License cleanup: add SPDX GPL-2.0 license identifier to files with no license
[linux-2.6/btrfs-unstable.git] / net / ipv4 / ip_sockglue.c
blob60fb1eb7d7d80d918f90bd316ed41977748dee1e
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * INET An implementation of the TCP/IP protocol suite for the LINUX
4 * operating system. INET is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
6 *
7 * The IP to API glue.
8 *
9 * Authors: see ip.c
10 *
11 * Fixes:
12 * Many : Split from ip.c , see ip.c for history.
13 * Martin Mares : TOS setting fixed.
14 * Alan Cox : Fixed a couple of oopses in Martin's
15 * TOS tweaks.
16 * Mike McLagan : Routing by source
17 */
18
19 #include <linux/module.h>
20 #include <linux/types.h>
21 #include <linux/mm.h>
22 #include <linux/skbuff.h>
23 #include <linux/ip.h>
24 #include <linux/icmp.h>
25 #include <linux/inetdevice.h>
26 #include <linux/netdevice.h>
27 #include <linux/slab.h>
28 #include <net/sock.h>
29 #include <net/ip.h>
30 #include <net/icmp.h>
31 #include <net/tcp_states.h>
32 #include <linux/udp.h>
33 #include <linux/igmp.h>
34 #include <linux/netfilter.h>
35 #include <linux/route.h>
36 #include <linux/mroute.h>
37 #include <net/inet_ecn.h>
38 #include <net/route.h>
39 #include <net/xfrm.h>
40 #include <net/compat.h>
41 #include <net/checksum.h>
42 #if IS_ENABLED(CONFIG_IPV6)
43 #include <net/transp_v6.h>
44 #endif
45 #include <net/ip_fib.h>
46
47 #include <linux/errqueue.h>
48 #include <linux/uaccess.h>
49
50 /*
51 * SOL_IP control messages.
52 */
53
54 static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
55 {
56 struct in_pktinfo info = *PKTINFO_SKB_CB(skb);
57
58 info.ipi_addr.s_addr = ip_hdr(skb)->daddr;
59
60 put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
61 }
62
63 static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
64 {
65 int ttl = ip_hdr(skb)->ttl;
66 put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
67 }
68
69 static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
70 {
71 put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos);
72 }
73
74 static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
75 {
76 if (IPCB(skb)->opt.optlen == 0)
77 return;
78
79 put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen,
80 ip_hdr(skb) + 1);
81 }
82
83
84 static void ip_cmsg_recv_retopts(struct net *net, struct msghdr *msg,
85 struct sk_buff *skb)
86 {
87 unsigned char optbuf[sizeof(struct ip_options) + 40];
88 struct ip_options *opt = (struct ip_options *)optbuf;
89
90 if (IPCB(skb)->opt.optlen == 0)
91 return;
92
93 if (ip_options_echo(net, opt, skb)) {
94 msg->msg_flags |= MSG_CTRUNC;
95 return;
96 }
97 ip_options_undo(opt);
98
99 put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data);
100 }
101
102 static void ip_cmsg_recv_fragsize(struct msghdr *msg, struct sk_buff *skb)
103 {
104 int val;
105
106 if (IPCB(skb)->frag_max_size == 0)
107 return;
108
109 val = IPCB(skb)->frag_max_size;
110 put_cmsg(msg, SOL_IP, IP_RECVFRAGSIZE, sizeof(val), &val);
111 }
112
113 static void ip_cmsg_recv_checksum(struct msghdr *msg, struct sk_buff *skb,
114 int tlen, int offset)
115 {
116 __wsum csum = skb->csum;
117
118 if (skb->ip_summed != CHECKSUM_COMPLETE)
119 return;
120
121 if (offset != 0) {
122 int tend_off = skb_transport_offset(skb) + tlen;
123 csum = csum_sub(csum, skb_checksum(skb, tend_off, offset, 0));
124 }
125
126 put_cmsg(msg, SOL_IP, IP_CHECKSUM, sizeof(__wsum), &csum);
127 }
128
129 static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
130 {
131 char *secdata;
132 u32 seclen, secid;
133 int err;
134
135 err = security_socket_getpeersec_dgram(NULL, skb, &secid);
136 if (err)
137 return;
138
139 err = security_secid_to_secctx(secid, &secdata, &seclen);
140 if (err)
141 return;
142
143 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
144 security_release_secctx(secdata, seclen);
145 }
146
147 static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
148 {
149 struct sockaddr_in sin;
150 const struct iphdr *iph = ip_hdr(skb);
151 __be16 *ports = (__be16 *)skb_transport_header(skb);
152
153 if (skb_transport_offset(skb) + 4 > (int)skb->len)
154 return;
155
156 /* All current transport protocols have the port numbers in the
157 * first four bytes of the transport header and this function is
158 * written with this assumption in mind.
159 */
160
161 sin.sin_family = AF_INET;
162 sin.sin_addr.s_addr = iph->daddr;
163 sin.sin_port = ports[1];
164 memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
165
166 put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin);
167 }
168
169 void ip_cmsg_recv_offset(struct msghdr *msg, struct sock *sk,
170 struct sk_buff *skb, int tlen, int offset)
171 {
172 struct inet_sock *inet = inet_sk(sk);
173 unsigned int flags = inet->cmsg_flags;
174
175 /* Ordered by supposed usage frequency */
176 if (flags & IP_CMSG_PKTINFO) {
177 ip_cmsg_recv_pktinfo(msg, skb);
178
179 flags &= ~IP_CMSG_PKTINFO;
180 if (!flags)
181 return;
182 }
183
184 if (flags & IP_CMSG_TTL) {
185 ip_cmsg_recv_ttl(msg, skb);
186
187 flags &= ~IP_CMSG_TTL;
188 if (!flags)
189 return;
190 }
191
192 if (flags & IP_CMSG_TOS) {
193 ip_cmsg_recv_tos(msg, skb);
194
195 flags &= ~IP_CMSG_TOS;
196 if (!flags)
197 return;
198 }
199
200 if (flags & IP_CMSG_RECVOPTS) {
201 ip_cmsg_recv_opts(msg, skb);
202
203 flags &= ~IP_CMSG_RECVOPTS;
204 if (!flags)
205 return;
206 }
207
208 if (flags & IP_CMSG_RETOPTS) {
209 ip_cmsg_recv_retopts(sock_net(sk), msg, skb);
210
211 flags &= ~IP_CMSG_RETOPTS;
212 if (!flags)
213 return;
214 }
215
216 if (flags & IP_CMSG_PASSSEC) {
217 ip_cmsg_recv_security(msg, skb);
218
219 flags &= ~IP_CMSG_PASSSEC;
220 if (!flags)
221 return;
222 }
223
224 if (flags & IP_CMSG_ORIGDSTADDR) {
225 ip_cmsg_recv_dstaddr(msg, skb);
226
227 flags &= ~IP_CMSG_ORIGDSTADDR;
228 if (!flags)
229 return;
230 }
231
232 if (flags & IP_CMSG_CHECKSUM)
233 ip_cmsg_recv_checksum(msg, skb, tlen, offset);
234
235 if (flags & IP_CMSG_RECVFRAGSIZE)
236 ip_cmsg_recv_fragsize(msg, skb);
237 }
238 EXPORT_SYMBOL(ip_cmsg_recv_offset);
239
240 int ip_cmsg_send(struct sock *sk, struct msghdr *msg, struct ipcm_cookie *ipc,
241 bool allow_ipv6)
242 {
243 int err, val;
244 struct cmsghdr *cmsg;
245 struct net *net = sock_net(sk);
246
247 for_each_cmsghdr(cmsg, msg) {
248 if (!CMSG_OK(msg, cmsg))
249 return -EINVAL;
250 #if IS_ENABLED(CONFIG_IPV6)
251 if (allow_ipv6 &&
252 cmsg->cmsg_level == SOL_IPV6 &&
253 cmsg->cmsg_type == IPV6_PKTINFO) {
254 struct in6_pktinfo *src_info;
255
256 if (cmsg->cmsg_len < CMSG_LEN(sizeof(*src_info)))
257 return -EINVAL;
258 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
259 if (!ipv6_addr_v4mapped(&src_info->ipi6_addr))
260 return -EINVAL;
261 ipc->oif = src_info->ipi6_ifindex;
262 ipc->addr = src_info->ipi6_addr.s6_addr32[3];
263 continue;
264 }
265 #endif
266 if (cmsg->cmsg_level == SOL_SOCKET) {
267 err = __sock_cmsg_send(sk, msg, cmsg, &ipc->sockc);
268 if (err)
269 return err;
270 continue;
271 }
272
273 if (cmsg->cmsg_level != SOL_IP)
274 continue;
275 switch (cmsg->cmsg_type) {
276 case IP_RETOPTS:
277 err = cmsg->cmsg_len - sizeof(struct cmsghdr);
278
279 /* Our caller is responsible for freeing ipc->opt */
280 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg),
281 err < 40 ? err : 40);
282 if (err)
283 return err;
284 break;
285 case IP_PKTINFO:
286 {
287 struct in_pktinfo *info;
288 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
289 return -EINVAL;
290 info = (struct in_pktinfo *)CMSG_DATA(cmsg);
291 ipc->oif = info->ipi_ifindex;
292 ipc->addr = info->ipi_spec_dst.s_addr;
293 break;
294 }
295 case IP_TTL:
296 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
297 return -EINVAL;
298 val = *(int *)CMSG_DATA(cmsg);
299 if (val < 1 || val > 255)
300 return -EINVAL;
301 ipc->ttl = val;
302 break;
303 case IP_TOS:
304 if (cmsg->cmsg_len == CMSG_LEN(sizeof(int)))
305 val = *(int *)CMSG_DATA(cmsg);
306 else if (cmsg->cmsg_len == CMSG_LEN(sizeof(u8)))
307 val = *(u8 *)CMSG_DATA(cmsg);
308 else
309 return -EINVAL;
310 if (val < 0 || val > 255)
311 return -EINVAL;
312 ipc->tos = val;
313 ipc->priority = rt_tos2priority(ipc->tos);
314 break;
315
316 default:
317 return -EINVAL;
318 }
319 }
320 return 0;
321 }
322
323
324 /* Special input handler for packets caught by router alert option.
325 They are selected only by protocol field, and then processed likely
326 local ones; but only if someone wants them! Otherwise, router
327 not running rsvpd will kill RSVP.
328
329 It is user level problem, what it will make with them.
330 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
331 but receiver should be enough clever f.e. to forward mtrace requests,
332 sent to multicast group to reach destination designated router.
333 */
334 struct ip_ra_chain __rcu *ip_ra_chain;
335
336
337 static void ip_ra_destroy_rcu(struct rcu_head *head)
338 {
339 struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu);
340
341 sock_put(ra->saved_sk);
342 kfree(ra);
343 }
344
345 int ip_ra_control(struct sock *sk, unsigned char on,
346 void (*destructor)(struct sock *))
347 {
348 struct ip_ra_chain *ra, *new_ra;
349 struct ip_ra_chain __rcu **rap;
350
351 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW)
352 return -EINVAL;
353
354 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
355
356 for (rap = &ip_ra_chain;
357 (ra = rtnl_dereference(*rap)) != NULL;
358 rap = &ra->next) {
359 if (ra->sk == sk) {
360 if (on) {
361 kfree(new_ra);
362 return -EADDRINUSE;
363 }
364 /* dont let ip_call_ra_chain() use sk again */
365 ra->sk = NULL;
366 RCU_INIT_POINTER(*rap, ra->next);
367
368 if (ra->destructor)
369 ra->destructor(sk);
370 /*
371 * Delay sock_put(sk) and kfree(ra) after one rcu grace
372 * period. This guarantee ip_call_ra_chain() dont need
373 * to mess with socket refcounts.
374 */
375 ra->saved_sk = sk;
376 call_rcu(&ra->rcu, ip_ra_destroy_rcu);
377 return 0;
378 }
379 }
380 if (!new_ra)
381 return -ENOBUFS;
382 new_ra->sk = sk;
383 new_ra->destructor = destructor;
384
385 RCU_INIT_POINTER(new_ra->next, ra);
386 rcu_assign_pointer(*rap, new_ra);
387 sock_hold(sk);
388
389 return 0;
390 }
391
392 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
393 __be16 port, u32 info, u8 *payload)
394 {
395 struct sock_exterr_skb *serr;
396
397 skb = skb_clone(skb, GFP_ATOMIC);
398 if (!skb)
399 return;
400
401 serr = SKB_EXT_ERR(skb);
402 serr->ee.ee_errno = err;
403 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
404 serr->ee.ee_type = icmp_hdr(skb)->type;
405 serr->ee.ee_code = icmp_hdr(skb)->code;
406 serr->ee.ee_pad = 0;
407 serr->ee.ee_info = info;
408 serr->ee.ee_data = 0;
409 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
410 skb_network_header(skb);
411 serr->port = port;
412
413 if (skb_pull(skb, payload - skb->data)) {
414 skb_reset_transport_header(skb);
415 if (sock_queue_err_skb(sk, skb) == 0)
416 return;
417 }
418 kfree_skb(skb);
419 }
420
421 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
422 {
423 struct inet_sock *inet = inet_sk(sk);
424 struct sock_exterr_skb *serr;
425 struct iphdr *iph;
426 struct sk_buff *skb;
427
428 if (!inet->recverr)
429 return;
430
431 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
432 if (!skb)
433 return;
434
435 skb_put(skb, sizeof(struct iphdr));
436 skb_reset_network_header(skb);
437 iph = ip_hdr(skb);
438 iph->daddr = daddr;
439
440 serr = SKB_EXT_ERR(skb);
441 serr->ee.ee_errno = err;
442 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
443 serr->ee.ee_type = 0;
444 serr->ee.ee_code = 0;
445 serr->ee.ee_pad = 0;
446 serr->ee.ee_info = info;
447 serr->ee.ee_data = 0;
448 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
449 serr->port = port;
450
451 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
452 skb_reset_transport_header(skb);
453
454 if (sock_queue_err_skb(sk, skb))
455 kfree_skb(skb);
456 }
457
458 /* For some errors we have valid addr_offset even with zero payload and
459 * zero port. Also, addr_offset should be supported if port is set.
460 */
461 static inline bool ipv4_datagram_support_addr(struct sock_exterr_skb *serr)
462 {
463 return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
464 serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port;
465 }
466
467 /* IPv4 supports cmsg on all imcp errors and some timestamps
468 *
469 * Timestamp code paths do not initialize the fields expected by cmsg:
470 * the PKTINFO fields in skb->cb[]. Fill those in here.
471 */
472 static bool ipv4_datagram_support_cmsg(const struct sock *sk,
473 struct sk_buff *skb,
474 int ee_origin)
475 {
476 struct in_pktinfo *info;
477
478 if (ee_origin == SO_EE_ORIGIN_ICMP)
479 return true;
480
481 if (ee_origin == SO_EE_ORIGIN_LOCAL)
482 return false;
483
484 /* Support IP_PKTINFO on tstamp packets if requested, to correlate
485 * timestamp with egress dev. Not possible for packets without iif
486 * or without payload (SOF_TIMESTAMPING_OPT_TSONLY).
487 */
488 info = PKTINFO_SKB_CB(skb);
489 if (!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_CMSG) ||
490 !info->ipi_ifindex)
491 return false;
492
493 info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr;
494 return true;
495 }
496
497 /*
498 * Handle MSG_ERRQUEUE
499 */
500 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
501 {
502 struct sock_exterr_skb *serr;
503 struct sk_buff *skb;
504 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
505 struct {
506 struct sock_extended_err ee;
507 struct sockaddr_in offender;
508 } errhdr;
509 int err;
510 int copied;
511
512 WARN_ON_ONCE(sk->sk_family == AF_INET6);
513
514 err = -EAGAIN;
515 skb = sock_dequeue_err_skb(sk);
516 if (!skb)
517 goto out;
518
519 copied = skb->len;
520 if (copied > len) {
521 msg->msg_flags |= MSG_TRUNC;
522 copied = len;
523 }
524 err = skb_copy_datagram_msg(skb, 0, msg, copied);
525 if (unlikely(err)) {
526 kfree_skb(skb);
527 return err;
528 }
529 sock_recv_timestamp(msg, sk, skb);
530
531 serr = SKB_EXT_ERR(skb);
532
533 if (sin && ipv4_datagram_support_addr(serr)) {
534 sin->sin_family = AF_INET;
535 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
536 serr->addr_offset);
537 sin->sin_port = serr->port;
538 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
539 *addr_len = sizeof(*sin);
540 }
541
542 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
543 sin = &errhdr.offender;
544 memset(sin, 0, sizeof(*sin));
545
546 if (ipv4_datagram_support_cmsg(sk, skb, serr->ee.ee_origin)) {
547 sin->sin_family = AF_INET;
548 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
549 if (inet_sk(sk)->cmsg_flags)
550 ip_cmsg_recv(msg, skb);
551 }
552
553 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
554
555 /* Now we could try to dump offended packet options */
556
557 msg->msg_flags |= MSG_ERRQUEUE;
558 err = copied;
559
560 consume_skb(skb);
561 out:
562 return err;
563 }
564
565
566 /*
567 * Socket option code for IP. This is the end of the line after any
568 * TCP,UDP etc options on an IP socket.
569 */
570 static bool setsockopt_needs_rtnl(int optname)
571 {
572 switch (optname) {
573 case IP_ADD_MEMBERSHIP:
574 case IP_ADD_SOURCE_MEMBERSHIP:
575 case IP_BLOCK_SOURCE:
576 case IP_DROP_MEMBERSHIP:
577 case IP_DROP_SOURCE_MEMBERSHIP:
578 case IP_MSFILTER:
579 case IP_UNBLOCK_SOURCE:
580 case MCAST_BLOCK_SOURCE:
581 case MCAST_MSFILTER:
582 case MCAST_JOIN_GROUP:
583 case MCAST_JOIN_SOURCE_GROUP:
584 case MCAST_LEAVE_GROUP:
585 case MCAST_LEAVE_SOURCE_GROUP:
586 case MCAST_UNBLOCK_SOURCE:
587 case IP_ROUTER_ALERT:
588 return true;
589 }
590 return false;
591 }
592
593 static int do_ip_setsockopt(struct sock *sk, int level,
594 int optname, char __user *optval, unsigned int optlen)
595 {
596 struct inet_sock *inet = inet_sk(sk);
597 struct net *net = sock_net(sk);
598 int val = 0, err;
599 bool needs_rtnl = setsockopt_needs_rtnl(optname);
600
601 switch (optname) {
602 case IP_PKTINFO:
603 case IP_RECVTTL:
604 case IP_RECVOPTS:
605 case IP_RECVTOS:
606 case IP_RETOPTS:
607 case IP_TOS:
608 case IP_TTL:
609 case IP_HDRINCL:
610 case IP_MTU_DISCOVER:
611 case IP_RECVERR:
612 case IP_ROUTER_ALERT:
613 case IP_FREEBIND:
614 case IP_PASSSEC:
615 case IP_TRANSPARENT:
616 case IP_MINTTL:
617 case IP_NODEFRAG:
618 case IP_BIND_ADDRESS_NO_PORT:
619 case IP_UNICAST_IF:
620 case IP_MULTICAST_TTL:
621 case IP_MULTICAST_ALL:
622 case IP_MULTICAST_LOOP:
623 case IP_RECVORIGDSTADDR:
624 case IP_CHECKSUM:
625 case IP_RECVFRAGSIZE:
626 if (optlen >= sizeof(int)) {
627 if (get_user(val, (int __user *) optval))
628 return -EFAULT;
629 } else if (optlen >= sizeof(char)) {
630 unsigned char ucval;
631
632 if (get_user(ucval, (unsigned char __user *) optval))
633 return -EFAULT;
634 val = (int) ucval;
635 }
636 }
637
638 /* If optlen==0, it is equivalent to val == 0 */
639
640 if (ip_mroute_opt(optname))
641 return ip_mroute_setsockopt(sk, optname, optval, optlen);
642
643 err = 0;
644 if (needs_rtnl)
645 rtnl_lock();
646 lock_sock(sk);
647
648 switch (optname) {
649 case IP_OPTIONS:
650 {
651 struct ip_options_rcu *old, *opt = NULL;
652
653 if (optlen > 40)
654 goto e_inval;
655 err = ip_options_get_from_user(sock_net(sk), &opt,
656 optval, optlen);
657 if (err)
658 break;
659 old = rcu_dereference_protected(inet->inet_opt,
660 lockdep_sock_is_held(sk));
661 if (inet->is_icsk) {
662 struct inet_connection_sock *icsk = inet_csk(sk);
663 #if IS_ENABLED(CONFIG_IPV6)
664 if (sk->sk_family == PF_INET ||
665 (!((1 << sk->sk_state) &
666 (TCPF_LISTEN | TCPF_CLOSE)) &&
667 inet->inet_daddr != LOOPBACK4_IPV6)) {
668 #endif
669 if (old)
670 icsk->icsk_ext_hdr_len -= old->opt.optlen;
671 if (opt)
672 icsk->icsk_ext_hdr_len += opt->opt.optlen;
673 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
674 #if IS_ENABLED(CONFIG_IPV6)
675 }
676 #endif
677 }
678 rcu_assign_pointer(inet->inet_opt, opt);
679 if (old)
680 kfree_rcu(old, rcu);
681 break;
682 }
683 case IP_PKTINFO:
684 if (val)
685 inet->cmsg_flags |= IP_CMSG_PKTINFO;
686 else
687 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
688 break;
689 case IP_RECVTTL:
690 if (val)
691 inet->cmsg_flags |= IP_CMSG_TTL;
692 else
693 inet->cmsg_flags &= ~IP_CMSG_TTL;
694 break;
695 case IP_RECVTOS:
696 if (val)
697 inet->cmsg_flags |= IP_CMSG_TOS;
698 else
699 inet->cmsg_flags &= ~IP_CMSG_TOS;
700 break;
701 case IP_RECVOPTS:
702 if (val)
703 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
704 else
705 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
706 break;
707 case IP_RETOPTS:
708 if (val)
709 inet->cmsg_flags |= IP_CMSG_RETOPTS;
710 else
711 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
712 break;
713 case IP_PASSSEC:
714 if (val)
715 inet->cmsg_flags |= IP_CMSG_PASSSEC;
716 else
717 inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
718 break;
719 case IP_RECVORIGDSTADDR:
720 if (val)
721 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR;
722 else
723 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR;
724 break;
725 case IP_CHECKSUM:
726 if (val) {
727 if (!(inet->cmsg_flags & IP_CMSG_CHECKSUM)) {
728 inet_inc_convert_csum(sk);
729 inet->cmsg_flags |= IP_CMSG_CHECKSUM;
730 }
731 } else {
732 if (inet->cmsg_flags & IP_CMSG_CHECKSUM) {
733 inet_dec_convert_csum(sk);
734 inet->cmsg_flags &= ~IP_CMSG_CHECKSUM;
735 }
736 }
737 break;
738 case IP_RECVFRAGSIZE:
739 if (sk->sk_type != SOCK_RAW && sk->sk_type != SOCK_DGRAM)
740 goto e_inval;
741 if (val)
742 inet->cmsg_flags |= IP_CMSG_RECVFRAGSIZE;
743 else
744 inet->cmsg_flags &= ~IP_CMSG_RECVFRAGSIZE;
745 break;
746 case IP_TOS: /* This sets both TOS and Precedence */
747 if (sk->sk_type == SOCK_STREAM) {
748 val &= ~INET_ECN_MASK;
749 val |= inet->tos & INET_ECN_MASK;
750 }
751 if (inet->tos != val) {
752 inet->tos = val;
753 sk->sk_priority = rt_tos2priority(val);
754 sk_dst_reset(sk);
755 }
756 break;
757 case IP_TTL:
758 if (optlen < 1)
759 goto e_inval;
760 if (val != -1 && (val < 1 || val > 255))
761 goto e_inval;
762 inet->uc_ttl = val;
763 break;
764 case IP_HDRINCL:
765 if (sk->sk_type != SOCK_RAW) {
766 err = -ENOPROTOOPT;
767 break;
768 }
769 inet->hdrincl = val ? 1 : 0;
770 break;
771 case IP_NODEFRAG:
772 if (sk->sk_type != SOCK_RAW) {
773 err = -ENOPROTOOPT;
774 break;
775 }
776 inet->nodefrag = val ? 1 : 0;
777 break;
778 case IP_BIND_ADDRESS_NO_PORT:
779 inet->bind_address_no_port = val ? 1 : 0;
780 break;
781 case IP_MTU_DISCOVER:
782 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT)
783 goto e_inval;
784 inet->pmtudisc = val;
785 break;
786 case IP_RECVERR:
787 inet->recverr = !!val;
788 if (!val)
789 skb_queue_purge(&sk->sk_error_queue);
790 break;
791 case IP_MULTICAST_TTL:
792 if (sk->sk_type == SOCK_STREAM)
793 goto e_inval;
794 if (optlen < 1)
795 goto e_inval;
796 if (val == -1)
797 val = 1;
798 if (val < 0 || val > 255)
799 goto e_inval;
800 inet->mc_ttl = val;
801 break;
802 case IP_MULTICAST_LOOP:
803 if (optlen < 1)
804 goto e_inval;
805 inet->mc_loop = !!val;
806 break;
807 case IP_UNICAST_IF:
808 {
809 struct net_device *dev = NULL;
810 int ifindex;
811
812 if (optlen != sizeof(int))
813 goto e_inval;
814
815 ifindex = (__force int)ntohl((__force __be32)val);
816 if (ifindex == 0) {
817 inet->uc_index = 0;
818 err = 0;
819 break;
820 }
821
822 dev = dev_get_by_index(sock_net(sk), ifindex);
823 err = -EADDRNOTAVAIL;
824 if (!dev)
825 break;
826 dev_put(dev);
827
828 err = -EINVAL;
829 if (sk->sk_bound_dev_if)
830 break;
831
832 inet->uc_index = ifindex;
833 err = 0;
834 break;
835 }
836 case IP_MULTICAST_IF:
837 {
838 struct ip_mreqn mreq;
839 struct net_device *dev = NULL;
840 int midx;
841
842 if (sk->sk_type == SOCK_STREAM)
843 goto e_inval;
844 /*
845 * Check the arguments are allowable
846 */
847
848 if (optlen < sizeof(struct in_addr))
849 goto e_inval;
850
851 err = -EFAULT;
852 if (optlen >= sizeof(struct ip_mreqn)) {
853 if (copy_from_user(&mreq, optval, sizeof(mreq)))
854 break;
855 } else {
856 memset(&mreq, 0, sizeof(mreq));
857 if (optlen >= sizeof(struct ip_mreq)) {
858 if (copy_from_user(&mreq, optval,
859 sizeof(struct ip_mreq)))
860 break;
861 } else if (optlen >= sizeof(struct in_addr)) {
862 if (copy_from_user(&mreq.imr_address, optval,
863 sizeof(struct in_addr)))
864 break;
865 }
866 }
867
868 if (!mreq.imr_ifindex) {
869 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
870 inet->mc_index = 0;
871 inet->mc_addr = 0;
872 err = 0;
873 break;
874 }
875 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
876 if (dev)
877 mreq.imr_ifindex = dev->ifindex;
878 } else
879 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
880
881
882 err = -EADDRNOTAVAIL;
883 if (!dev)
884 break;
885
886 midx = l3mdev_master_ifindex(dev);
887
888 dev_put(dev);
889
890 err = -EINVAL;
891 if (sk->sk_bound_dev_if &&
892 mreq.imr_ifindex != sk->sk_bound_dev_if &&
893 (!midx || midx != sk->sk_bound_dev_if))
894 break;
895
896 inet->mc_index = mreq.imr_ifindex;
897 inet->mc_addr = mreq.imr_address.s_addr;
898 err = 0;
899 break;
900 }
901
902 case IP_ADD_MEMBERSHIP:
903 case IP_DROP_MEMBERSHIP:
904 {
905 struct ip_mreqn mreq;
906
907 err = -EPROTO;
908 if (inet_sk(sk)->is_icsk)
909 break;
910
911 if (optlen < sizeof(struct ip_mreq))
912 goto e_inval;
913 err = -EFAULT;
914 if (optlen >= sizeof(struct ip_mreqn)) {
915 if (copy_from_user(&mreq, optval, sizeof(mreq)))
916 break;
917 } else {
918 memset(&mreq, 0, sizeof(mreq));
919 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq)))
920 break;
921 }
922
923 if (optname == IP_ADD_MEMBERSHIP)
924 err = ip_mc_join_group(sk, &mreq);
925 else
926 err = ip_mc_leave_group(sk, &mreq);
927 break;
928 }
929 case IP_MSFILTER:
930 {
931 struct ip_msfilter *msf;
932
933 if (optlen < IP_MSFILTER_SIZE(0))
934 goto e_inval;
935 if (optlen > sysctl_optmem_max) {
936 err = -ENOBUFS;
937 break;
938 }
939 msf = memdup_user(optval, optlen);
940 if (IS_ERR(msf)) {
941 err = PTR_ERR(msf);
942 break;
943 }
944 /* numsrc >= (1G-4) overflow in 32 bits */
945 if (msf->imsf_numsrc >= 0x3ffffffcU ||
946 msf->imsf_numsrc > net->ipv4.sysctl_igmp_max_msf) {
947 kfree(msf);
948 err = -ENOBUFS;
949 break;
950 }
951 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
952 kfree(msf);
953 err = -EINVAL;
954 break;
955 }
956 err = ip_mc_msfilter(sk, msf, 0);
957 kfree(msf);
958 break;
959 }
960 case IP_BLOCK_SOURCE:
961 case IP_UNBLOCK_SOURCE:
962 case IP_ADD_SOURCE_MEMBERSHIP:
963 case IP_DROP_SOURCE_MEMBERSHIP:
964 {
965 struct ip_mreq_source mreqs;
966 int omode, add;
967
968 if (optlen != sizeof(struct ip_mreq_source))
969 goto e_inval;
970 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
971 err = -EFAULT;
972 break;
973 }
974 if (optname == IP_BLOCK_SOURCE) {
975 omode = MCAST_EXCLUDE;
976 add = 1;
977 } else if (optname == IP_UNBLOCK_SOURCE) {
978 omode = MCAST_EXCLUDE;
979 add = 0;
980 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
981 struct ip_mreqn mreq;
982
983 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
984 mreq.imr_address.s_addr = mreqs.imr_interface;
985 mreq.imr_ifindex = 0;
986 err = ip_mc_join_group(sk, &mreq);
987 if (err && err != -EADDRINUSE)
988 break;
989 omode = MCAST_INCLUDE;
990 add = 1;
991 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
992 omode = MCAST_INCLUDE;
993 add = 0;
994 }
995 err = ip_mc_source(add, omode, sk, &mreqs, 0);
996 break;
997 }
998 case MCAST_JOIN_GROUP:
999 case MCAST_LEAVE_GROUP:
1000 {
1001 struct group_req greq;
1002 struct sockaddr_in *psin;
1003 struct ip_mreqn mreq;
1004
1005 if (optlen < sizeof(struct group_req))
1006 goto e_inval;
1007 err = -EFAULT;
1008 if (copy_from_user(&greq, optval, sizeof(greq)))
1009 break;
1010 psin = (struct sockaddr_in *)&greq.gr_group;
1011 if (psin->sin_family != AF_INET)
1012 goto e_inval;
1013 memset(&mreq, 0, sizeof(mreq));
1014 mreq.imr_multiaddr = psin->sin_addr;
1015 mreq.imr_ifindex = greq.gr_interface;
1016
1017 if (optname == MCAST_JOIN_GROUP)
1018 err = ip_mc_join_group(sk, &mreq);
1019 else
1020 err = ip_mc_leave_group(sk, &mreq);
1021 break;
1022 }
1023 case MCAST_JOIN_SOURCE_GROUP:
1024 case MCAST_LEAVE_SOURCE_GROUP:
1025 case MCAST_BLOCK_SOURCE:
1026 case MCAST_UNBLOCK_SOURCE:
1027 {
1028 struct group_source_req greqs;
1029 struct ip_mreq_source mreqs;
1030 struct sockaddr_in *psin;
1031 int omode, add;
1032
1033 if (optlen != sizeof(struct group_source_req))
1034 goto e_inval;
1035 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
1036 err = -EFAULT;
1037 break;
1038 }
1039 if (greqs.gsr_group.ss_family != AF_INET ||
1040 greqs.gsr_source.ss_family != AF_INET) {
1041 err = -EADDRNOTAVAIL;
1042 break;
1043 }
1044 psin = (struct sockaddr_in *)&greqs.gsr_group;
1045 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
1046 psin = (struct sockaddr_in *)&greqs.gsr_source;
1047 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
1048 mreqs.imr_interface = 0; /* use index for mc_source */
1049
1050 if (optname == MCAST_BLOCK_SOURCE) {
1051 omode = MCAST_EXCLUDE;
1052 add = 1;
1053 } else if (optname == MCAST_UNBLOCK_SOURCE) {
1054 omode = MCAST_EXCLUDE;
1055 add = 0;
1056 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
1057 struct ip_mreqn mreq;
1058
1059 psin = (struct sockaddr_in *)&greqs.gsr_group;
1060 mreq.imr_multiaddr = psin->sin_addr;
1061 mreq.imr_address.s_addr = 0;
1062 mreq.imr_ifindex = greqs.gsr_interface;
1063 err = ip_mc_join_group(sk, &mreq);
1064 if (err && err != -EADDRINUSE)
1065 break;
1066 greqs.gsr_interface = mreq.imr_ifindex;
1067 omode = MCAST_INCLUDE;
1068 add = 1;
1069 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
1070 omode = MCAST_INCLUDE;
1071 add = 0;
1072 }
1073 err = ip_mc_source(add, omode, sk, &mreqs,
1074 greqs.gsr_interface);
1075 break;
1076 }
1077 case MCAST_MSFILTER:
1078 {
1079 struct sockaddr_in *psin;
1080 struct ip_msfilter *msf = NULL;
1081 struct group_filter *gsf = NULL;
1082 int msize, i, ifindex;
1083
1084 if (optlen < GROUP_FILTER_SIZE(0))
1085 goto e_inval;
1086 if (optlen > sysctl_optmem_max) {
1087 err = -ENOBUFS;
1088 break;
1089 }
1090 gsf = memdup_user(optval, optlen);
1091 if (IS_ERR(gsf)) {
1092 err = PTR_ERR(gsf);
1093 break;
1094 }
1095
1096 /* numsrc >= (4G-140)/128 overflow in 32 bits */
1097 if (gsf->gf_numsrc >= 0x1ffffff ||
1098 gsf->gf_numsrc > net->ipv4.sysctl_igmp_max_msf) {
1099 err = -ENOBUFS;
1100 goto mc_msf_out;
1101 }
1102 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
1103 err = -EINVAL;
1104 goto mc_msf_out;
1105 }
1106 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
1107 msf = kmalloc(msize, GFP_KERNEL);
1108 if (!msf) {
1109 err = -ENOBUFS;
1110 goto mc_msf_out;
1111 }
1112 ifindex = gsf->gf_interface;
1113 psin = (struct sockaddr_in *)&gsf->gf_group;
1114 if (psin->sin_family != AF_INET) {
1115 err = -EADDRNOTAVAIL;
1116 goto mc_msf_out;
1117 }
1118 msf->imsf_multiaddr = psin->sin_addr.s_addr;
1119 msf->imsf_interface = 0;
1120 msf->imsf_fmode = gsf->gf_fmode;
1121 msf->imsf_numsrc = gsf->gf_numsrc;
1122 err = -EADDRNOTAVAIL;
1123 for (i = 0; i < gsf->gf_numsrc; ++i) {
1124 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
1125
1126 if (psin->sin_family != AF_INET)
1127 goto mc_msf_out;
1128 msf->imsf_slist[i] = psin->sin_addr.s_addr;
1129 }
1130 kfree(gsf);
1131 gsf = NULL;
1132
1133 err = ip_mc_msfilter(sk, msf, ifindex);
1134 mc_msf_out:
1135 kfree(msf);
1136 kfree(gsf);
1137 break;
1138 }
1139 case IP_MULTICAST_ALL:
1140 if (optlen < 1)
1141 goto e_inval;
1142 if (val != 0 && val != 1)
1143 goto e_inval;
1144 inet->mc_all = val;
1145 break;
1146 case IP_ROUTER_ALERT:
1147 err = ip_ra_control(sk, val ? 1 : 0, NULL);
1148 break;
1149
1150 case IP_FREEBIND:
1151 if (optlen < 1)
1152 goto e_inval;
1153 inet->freebind = !!val;
1154 break;
1155
1156 case IP_IPSEC_POLICY:
1157 case IP_XFRM_POLICY:
1158 err = -EPERM;
1159 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1160 break;
1161 err = xfrm_user_policy(sk, optname, optval, optlen);
1162 break;
1163
1164 case IP_TRANSPARENT:
1165 if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) &&
1166 !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
1167 err = -EPERM;
1168 break;
1169 }
1170 if (optlen < 1)
1171 goto e_inval;
1172 inet->transparent = !!val;
1173 break;
1174
1175 case IP_MINTTL:
1176 if (optlen < 1)
1177 goto e_inval;
1178 if (val < 0 || val > 255)
1179 goto e_inval;
1180 inet->min_ttl = val;
1181 break;
1182
1183 default:
1184 err = -ENOPROTOOPT;
1185 break;
1186 }
1187 release_sock(sk);
1188 if (needs_rtnl)
1189 rtnl_unlock();
1190 return err;
1191
1192 e_inval:
1193 release_sock(sk);
1194 if (needs_rtnl)
1195 rtnl_unlock();
1196 return -EINVAL;
1197 }
1198
1199 /**
1200 * ipv4_pktinfo_prepare - transfer some info from rtable to skb
1201 * @sk: socket
1202 * @skb: buffer
1203 *
1204 * To support IP_CMSG_PKTINFO option, we store rt_iif and specific
1205 * destination in skb->cb[] before dst drop.
1206 * This way, receiver doesn't make cache line misses to read rtable.
1207 */
1208 void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb)
1209 {
1210 struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb);
1211 bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) ||
1212 ipv6_sk_rxinfo(sk);
1213
1214 if (prepare && skb_rtable(skb)) {
1215 /* skb->cb is overloaded: prior to this point it is IP{6}CB
1216 * which has interface index (iif) as the first member of the
1217 * underlying inet{6}_skb_parm struct. This code then overlays
1218 * PKTINFO_SKB_CB and in_pktinfo also has iif as the first
1219 * element so the iif is picked up from the prior IPCB. If iif
1220 * is the loopback interface, then return the sending interface
1221 * (e.g., process binds socket to eth0 for Tx which is
1222 * redirected to loopback in the rtable/dst).
1223 */
1224 struct rtable *rt = skb_rtable(skb);
1225 bool l3slave = ipv4_l3mdev_skb(IPCB(skb)->flags);
1226
1227 if (pktinfo->ipi_ifindex == LOOPBACK_IFINDEX)
1228 pktinfo->ipi_ifindex = inet_iif(skb);
1229 else if (l3slave && rt && rt->rt_iif)
1230 pktinfo->ipi_ifindex = rt->rt_iif;
1231
1232 pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb);
1233 } else {
1234 pktinfo->ipi_ifindex = 0;
1235 pktinfo->ipi_spec_dst.s_addr = 0;
1236 }
1237 skb_dst_drop(skb);
1238 }
1239
1240 int ip_setsockopt(struct sock *sk, int level,
1241 int optname, char __user *optval, unsigned int optlen)
1242 {
1243 int err;
1244
1245 if (level != SOL_IP)
1246 return -ENOPROTOOPT;
1247
1248 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1249 #ifdef CONFIG_NETFILTER
1250 /* we need to exclude all possible ENOPROTOOPTs except default case */
1251 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
1252 optname != IP_IPSEC_POLICY &&
1253 optname != IP_XFRM_POLICY &&
1254 !ip_mroute_opt(optname)) {
1255 lock_sock(sk);
1256 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
1257 release_sock(sk);
1258 }
1259 #endif
1260 return err;
1261 }
1262 EXPORT_SYMBOL(ip_setsockopt);
1263
1264 #ifdef CONFIG_COMPAT
1265 int compat_ip_setsockopt(struct sock *sk, int level, int optname,
1266 char __user *optval, unsigned int optlen)
1267 {
1268 int err;
1269
1270 if (level != SOL_IP)
1271 return -ENOPROTOOPT;
1272
1273 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
1274 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
1275 ip_setsockopt);
1276
1277 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1278 #ifdef CONFIG_NETFILTER
1279 /* we need to exclude all possible ENOPROTOOPTs except default case */
1280 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
1281 optname != IP_IPSEC_POLICY &&
1282 optname != IP_XFRM_POLICY &&
1283 !ip_mroute_opt(optname)) {
1284 lock_sock(sk);
1285 err = compat_nf_setsockopt(sk, PF_INET, optname,
1286 optval, optlen);
1287 release_sock(sk);
1288 }
1289 #endif
1290 return err;
1291 }
1292 EXPORT_SYMBOL(compat_ip_setsockopt);
1293 #endif
1294
1295 /*
1296 * Get the options. Note for future reference. The GET of IP options gets
1297 * the _received_ ones. The set sets the _sent_ ones.
1298 */
1299
1300 static bool getsockopt_needs_rtnl(int optname)
1301 {
1302 switch (optname) {
1303 case IP_MSFILTER:
1304 case MCAST_MSFILTER:
1305 return true;
1306 }
1307 return false;
1308 }
1309
1310 static int do_ip_getsockopt(struct sock *sk, int level, int optname,
1311 char __user *optval, int __user *optlen, unsigned int flags)
1312 {
1313 struct inet_sock *inet = inet_sk(sk);
1314 bool needs_rtnl = getsockopt_needs_rtnl(optname);
1315 int val, err = 0;
1316 int len;
1317
1318 if (level != SOL_IP)
1319 return -EOPNOTSUPP;
1320
1321 if (ip_mroute_opt(optname))
1322 return ip_mroute_getsockopt(sk, optname, optval, optlen);
1323
1324 if (get_user(len, optlen))
1325 return -EFAULT;
1326 if (len < 0)
1327 return -EINVAL;
1328
1329 if (needs_rtnl)
1330 rtnl_lock();
1331 lock_sock(sk);
1332
1333 switch (optname) {
1334 case IP_OPTIONS:
1335 {
1336 unsigned char optbuf[sizeof(struct ip_options)+40];
1337 struct ip_options *opt = (struct ip_options *)optbuf;
1338 struct ip_options_rcu *inet_opt;
1339
1340 inet_opt = rcu_dereference_protected(inet->inet_opt,
1341 lockdep_sock_is_held(sk));
1342 opt->optlen = 0;
1343 if (inet_opt)
1344 memcpy(optbuf, &inet_opt->opt,
1345 sizeof(struct ip_options) +
1346 inet_opt->opt.optlen);
1347 release_sock(sk);
1348
1349 if (opt->optlen == 0)
1350 return put_user(0, optlen);
1351
1352 ip_options_undo(opt);
1353
1354 len = min_t(unsigned int, len, opt->optlen);
1355 if (put_user(len, optlen))
1356 return -EFAULT;
1357 if (copy_to_user(optval, opt->__data, len))
1358 return -EFAULT;
1359 return 0;
1360 }
1361 case IP_PKTINFO:
1362 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
1363 break;
1364 case IP_RECVTTL:
1365 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1366 break;
1367 case IP_RECVTOS:
1368 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1369 break;
1370 case IP_RECVOPTS:
1371 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1372 break;
1373 case IP_RETOPTS:
1374 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1375 break;
1376 case IP_PASSSEC:
1377 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1378 break;
1379 case IP_RECVORIGDSTADDR:
1380 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0;
1381 break;
1382 case IP_CHECKSUM:
1383 val = (inet->cmsg_flags & IP_CMSG_CHECKSUM) != 0;
1384 break;
1385 case IP_RECVFRAGSIZE:
1386 val = (inet->cmsg_flags & IP_CMSG_RECVFRAGSIZE) != 0;
1387 break;
1388 case IP_TOS:
1389 val = inet->tos;
1390 break;
1391 case IP_TTL:
1392 {
1393 struct net *net = sock_net(sk);
1394 val = (inet->uc_ttl == -1 ?
1395 net->ipv4.sysctl_ip_default_ttl :
1396 inet->uc_ttl);
1397 break;
1398 }
1399 case IP_HDRINCL:
1400 val = inet->hdrincl;
1401 break;
1402 case IP_NODEFRAG:
1403 val = inet->nodefrag;
1404 break;
1405 case IP_BIND_ADDRESS_NO_PORT:
1406 val = inet->bind_address_no_port;
1407 break;
1408 case IP_MTU_DISCOVER:
1409 val = inet->pmtudisc;
1410 break;
1411 case IP_MTU:
1412 {
1413 struct dst_entry *dst;
1414 val = 0;
1415 dst = sk_dst_get(sk);
1416 if (dst) {
1417 val = dst_mtu(dst);
1418 dst_release(dst);
1419 }
1420 if (!val) {
1421 release_sock(sk);
1422 return -ENOTCONN;
1423 }
1424 break;
1425 }
1426 case IP_RECVERR:
1427 val = inet->recverr;
1428 break;
1429 case IP_MULTICAST_TTL:
1430 val = inet->mc_ttl;
1431 break;
1432 case IP_MULTICAST_LOOP:
1433 val = inet->mc_loop;
1434 break;
1435 case IP_UNICAST_IF:
1436 val = (__force int)htonl((__u32) inet->uc_index);
1437 break;
1438 case IP_MULTICAST_IF:
1439 {
1440 struct in_addr addr;
1441 len = min_t(unsigned int, len, sizeof(struct in_addr));
1442 addr.s_addr = inet->mc_addr;
1443 release_sock(sk);
1444
1445 if (put_user(len, optlen))
1446 return -EFAULT;
1447 if (copy_to_user(optval, &addr, len))
1448 return -EFAULT;
1449 return 0;
1450 }
1451 case IP_MSFILTER:
1452 {
1453 struct ip_msfilter msf;
1454
1455 if (len < IP_MSFILTER_SIZE(0)) {
1456 err = -EINVAL;
1457 goto out;
1458 }
1459 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1460 err = -EFAULT;
1461 goto out;
1462 }
1463 err = ip_mc_msfget(sk, &msf,
1464 (struct ip_msfilter __user *)optval, optlen);
1465 goto out;
1466 }
1467 case MCAST_MSFILTER:
1468 {
1469 struct group_filter gsf;
1470
1471 if (len < GROUP_FILTER_SIZE(0)) {
1472 err = -EINVAL;
1473 goto out;
1474 }
1475 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1476 err = -EFAULT;
1477 goto out;
1478 }
1479 err = ip_mc_gsfget(sk, &gsf,
1480 (struct group_filter __user *)optval,
1481 optlen);
1482 goto out;
1483 }
1484 case IP_MULTICAST_ALL:
1485 val = inet->mc_all;
1486 break;
1487 case IP_PKTOPTIONS:
1488 {
1489 struct msghdr msg;
1490
1491 release_sock(sk);
1492
1493 if (sk->sk_type != SOCK_STREAM)
1494 return -ENOPROTOOPT;
1495
1496 msg.msg_control = (__force void *) optval;
1497 msg.msg_controllen = len;
1498 msg.msg_flags = flags;
1499
1500 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1501 struct in_pktinfo info;
1502
1503 info.ipi_addr.s_addr = inet->inet_rcv_saddr;
1504 info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr;
1505 info.ipi_ifindex = inet->mc_index;
1506 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1507 }
1508 if (inet->cmsg_flags & IP_CMSG_TTL) {
1509 int hlim = inet->mc_ttl;
1510 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1511 }
1512 if (inet->cmsg_flags & IP_CMSG_TOS) {
1513 int tos = inet->rcv_tos;
1514 put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos);
1515 }
1516 len -= msg.msg_controllen;
1517 return put_user(len, optlen);
1518 }
1519 case IP_FREEBIND:
1520 val = inet->freebind;
1521 break;
1522 case IP_TRANSPARENT:
1523 val = inet->transparent;
1524 break;
1525 case IP_MINTTL:
1526 val = inet->min_ttl;
1527 break;
1528 default:
1529 release_sock(sk);
1530 return -ENOPROTOOPT;
1531 }
1532 release_sock(sk);
1533
1534 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) {
1535 unsigned char ucval = (unsigned char)val;
1536 len = 1;
1537 if (put_user(len, optlen))
1538 return -EFAULT;
1539 if (copy_to_user(optval, &ucval, 1))
1540 return -EFAULT;
1541 } else {
1542 len = min_t(unsigned int, sizeof(int), len);
1543 if (put_user(len, optlen))
1544 return -EFAULT;
1545 if (copy_to_user(optval, &val, len))
1546 return -EFAULT;
1547 }
1548 return 0;
1549
1550 out:
1551 release_sock(sk);
1552 if (needs_rtnl)
1553 rtnl_unlock();
1554 return err;
1555 }
1556
1557 int ip_getsockopt(struct sock *sk, int level,
1558 int optname, char __user *optval, int __user *optlen)
1559 {
1560 int err;
1561
1562 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0);
1563 #ifdef CONFIG_NETFILTER
1564 /* we need to exclude all possible ENOPROTOOPTs except default case */
1565 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1566 !ip_mroute_opt(optname)) {
1567 int len;
1568
1569 if (get_user(len, optlen))
1570 return -EFAULT;
1571
1572 lock_sock(sk);
1573 err = nf_getsockopt(sk, PF_INET, optname, optval,
1574 &len);
1575 release_sock(sk);
1576 if (err >= 0)
1577 err = put_user(len, optlen);
1578 return err;
1579 }
1580 #endif
1581 return err;
1582 }
1583 EXPORT_SYMBOL(ip_getsockopt);
1584
1585 #ifdef CONFIG_COMPAT
1586 int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1587 char __user *optval, int __user *optlen)
1588 {
1589 int err;
1590
1591 if (optname == MCAST_MSFILTER)
1592 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1593 ip_getsockopt);
1594
1595 err = do_ip_getsockopt(sk, level, optname, optval, optlen,
1596 MSG_CMSG_COMPAT);
1597
1598 #ifdef CONFIG_NETFILTER
1599 /* we need to exclude all possible ENOPROTOOPTs except default case */
1600 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1601 !ip_mroute_opt(optname)) {
1602 int len;
1603
1604 if (get_user(len, optlen))
1605 return -EFAULT;
1606
1607 lock_sock(sk);
1608 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
1609 release_sock(sk);
1610 if (err >= 0)
1611 err = put_user(len, optlen);
1612 return err;
1613 }
1614 #endif
1615 return err;
1616 }
1617 EXPORT_SYMBOL(compat_ip_getsockopt);
1618 #endif
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