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[mirror_ubuntu-eoan-kernel.git] / net / ipv4 / ip_sockglue.c
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 if (src_info->ipi6_ifindex)
262 ipc->oif = src_info->ipi6_ifindex;
263 ipc->addr = src_info->ipi6_addr.s6_addr32[3];
264 continue;
265 }
266 #endif
267 if (cmsg->cmsg_level == SOL_SOCKET) {
268 err = __sock_cmsg_send(sk, msg, cmsg, &ipc->sockc);
269 if (err)
270 return err;
271 continue;
272 }
273
274 if (cmsg->cmsg_level != SOL_IP)
275 continue;
276 switch (cmsg->cmsg_type) {
277 case IP_RETOPTS:
278 err = cmsg->cmsg_len - sizeof(struct cmsghdr);
279
280 /* Our caller is responsible for freeing ipc->opt */
281 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg),
282 err < 40 ? err : 40);
283 if (err)
284 return err;
285 break;
286 case IP_PKTINFO:
287 {
288 struct in_pktinfo *info;
289 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
290 return -EINVAL;
291 info = (struct in_pktinfo *)CMSG_DATA(cmsg);
292 if (info->ipi_ifindex)
293 ipc->oif = info->ipi_ifindex;
294 ipc->addr = info->ipi_spec_dst.s_addr;
295 break;
296 }
297 case IP_TTL:
298 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
299 return -EINVAL;
300 val = *(int *)CMSG_DATA(cmsg);
301 if (val < 1 || val > 255)
302 return -EINVAL;
303 ipc->ttl = val;
304 break;
305 case IP_TOS:
306 if (cmsg->cmsg_len == CMSG_LEN(sizeof(int)))
307 val = *(int *)CMSG_DATA(cmsg);
308 else if (cmsg->cmsg_len == CMSG_LEN(sizeof(u8)))
309 val = *(u8 *)CMSG_DATA(cmsg);
310 else
311 return -EINVAL;
312 if (val < 0 || val > 255)
313 return -EINVAL;
314 ipc->tos = val;
315 ipc->priority = rt_tos2priority(ipc->tos);
316 break;
317
318 default:
319 return -EINVAL;
320 }
321 }
322 return 0;
323 }
324
325
326 /* Special input handler for packets caught by router alert option.
327 They are selected only by protocol field, and then processed likely
328 local ones; but only if someone wants them! Otherwise, router
329 not running rsvpd will kill RSVP.
330
331 It is user level problem, what it will make with them.
332 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
333 but receiver should be enough clever f.e. to forward mtrace requests,
334 sent to multicast group to reach destination designated router.
335 */
336 struct ip_ra_chain __rcu *ip_ra_chain;
337
338
339 static void ip_ra_destroy_rcu(struct rcu_head *head)
340 {
341 struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu);
342
343 sock_put(ra->saved_sk);
344 kfree(ra);
345 }
346
347 int ip_ra_control(struct sock *sk, unsigned char on,
348 void (*destructor)(struct sock *))
349 {
350 struct ip_ra_chain *ra, *new_ra;
351 struct ip_ra_chain __rcu **rap;
352
353 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW)
354 return -EINVAL;
355
356 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
357
358 for (rap = &ip_ra_chain;
359 (ra = rtnl_dereference(*rap)) != NULL;
360 rap = &ra->next) {
361 if (ra->sk == sk) {
362 if (on) {
363 kfree(new_ra);
364 return -EADDRINUSE;
365 }
366 /* dont let ip_call_ra_chain() use sk again */
367 ra->sk = NULL;
368 RCU_INIT_POINTER(*rap, ra->next);
369
370 if (ra->destructor)
371 ra->destructor(sk);
372 /*
373 * Delay sock_put(sk) and kfree(ra) after one rcu grace
374 * period. This guarantee ip_call_ra_chain() dont need
375 * to mess with socket refcounts.
376 */
377 ra->saved_sk = sk;
378 call_rcu(&ra->rcu, ip_ra_destroy_rcu);
379 return 0;
380 }
381 }
382 if (!new_ra)
383 return -ENOBUFS;
384 new_ra->sk = sk;
385 new_ra->destructor = destructor;
386
387 RCU_INIT_POINTER(new_ra->next, ra);
388 rcu_assign_pointer(*rap, new_ra);
389 sock_hold(sk);
390
391 return 0;
392 }
393
394 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
395 __be16 port, u32 info, u8 *payload)
396 {
397 struct sock_exterr_skb *serr;
398
399 skb = skb_clone(skb, GFP_ATOMIC);
400 if (!skb)
401 return;
402
403 serr = SKB_EXT_ERR(skb);
404 serr->ee.ee_errno = err;
405 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
406 serr->ee.ee_type = icmp_hdr(skb)->type;
407 serr->ee.ee_code = icmp_hdr(skb)->code;
408 serr->ee.ee_pad = 0;
409 serr->ee.ee_info = info;
410 serr->ee.ee_data = 0;
411 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
412 skb_network_header(skb);
413 serr->port = port;
414
415 if (skb_pull(skb, payload - skb->data)) {
416 skb_reset_transport_header(skb);
417 if (sock_queue_err_skb(sk, skb) == 0)
418 return;
419 }
420 kfree_skb(skb);
421 }
422
423 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
424 {
425 struct inet_sock *inet = inet_sk(sk);
426 struct sock_exterr_skb *serr;
427 struct iphdr *iph;
428 struct sk_buff *skb;
429
430 if (!inet->recverr)
431 return;
432
433 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
434 if (!skb)
435 return;
436
437 skb_put(skb, sizeof(struct iphdr));
438 skb_reset_network_header(skb);
439 iph = ip_hdr(skb);
440 iph->daddr = daddr;
441
442 serr = SKB_EXT_ERR(skb);
443 serr->ee.ee_errno = err;
444 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
445 serr->ee.ee_type = 0;
446 serr->ee.ee_code = 0;
447 serr->ee.ee_pad = 0;
448 serr->ee.ee_info = info;
449 serr->ee.ee_data = 0;
450 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
451 serr->port = port;
452
453 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
454 skb_reset_transport_header(skb);
455
456 if (sock_queue_err_skb(sk, skb))
457 kfree_skb(skb);
458 }
459
460 /* For some errors we have valid addr_offset even with zero payload and
461 * zero port. Also, addr_offset should be supported if port is set.
462 */
463 static inline bool ipv4_datagram_support_addr(struct sock_exterr_skb *serr)
464 {
465 return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
466 serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port;
467 }
468
469 /* IPv4 supports cmsg on all imcp errors and some timestamps
470 *
471 * Timestamp code paths do not initialize the fields expected by cmsg:
472 * the PKTINFO fields in skb->cb[]. Fill those in here.
473 */
474 static bool ipv4_datagram_support_cmsg(const struct sock *sk,
475 struct sk_buff *skb,
476 int ee_origin)
477 {
478 struct in_pktinfo *info;
479
480 if (ee_origin == SO_EE_ORIGIN_ICMP)
481 return true;
482
483 if (ee_origin == SO_EE_ORIGIN_LOCAL)
484 return false;
485
486 /* Support IP_PKTINFO on tstamp packets if requested, to correlate
487 * timestamp with egress dev. Not possible for packets without iif
488 * or without payload (SOF_TIMESTAMPING_OPT_TSONLY).
489 */
490 info = PKTINFO_SKB_CB(skb);
491 if (!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_CMSG) ||
492 !info->ipi_ifindex)
493 return false;
494
495 info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr;
496 return true;
497 }
498
499 /*
500 * Handle MSG_ERRQUEUE
501 */
502 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
503 {
504 struct sock_exterr_skb *serr;
505 struct sk_buff *skb;
506 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
507 struct {
508 struct sock_extended_err ee;
509 struct sockaddr_in offender;
510 } errhdr;
511 int err;
512 int copied;
513
514 WARN_ON_ONCE(sk->sk_family == AF_INET6);
515
516 err = -EAGAIN;
517 skb = sock_dequeue_err_skb(sk);
518 if (!skb)
519 goto out;
520
521 copied = skb->len;
522 if (copied > len) {
523 msg->msg_flags |= MSG_TRUNC;
524 copied = len;
525 }
526 err = skb_copy_datagram_msg(skb, 0, msg, copied);
527 if (unlikely(err)) {
528 kfree_skb(skb);
529 return err;
530 }
531 sock_recv_timestamp(msg, sk, skb);
532
533 serr = SKB_EXT_ERR(skb);
534
535 if (sin && ipv4_datagram_support_addr(serr)) {
536 sin->sin_family = AF_INET;
537 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
538 serr->addr_offset);
539 sin->sin_port = serr->port;
540 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
541 *addr_len = sizeof(*sin);
542 }
543
544 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
545 sin = &errhdr.offender;
546 memset(sin, 0, sizeof(*sin));
547
548 if (ipv4_datagram_support_cmsg(sk, skb, serr->ee.ee_origin)) {
549 sin->sin_family = AF_INET;
550 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
551 if (inet_sk(sk)->cmsg_flags)
552 ip_cmsg_recv(msg, skb);
553 }
554
555 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
556
557 /* Now we could try to dump offended packet options */
558
559 msg->msg_flags |= MSG_ERRQUEUE;
560 err = copied;
561
562 consume_skb(skb);
563 out:
564 return err;
565 }
566
567
568 /*
569 * Socket option code for IP. This is the end of the line after any
570 * TCP,UDP etc options on an IP socket.
571 */
572 static bool setsockopt_needs_rtnl(int optname)
573 {
574 switch (optname) {
575 case IP_ADD_MEMBERSHIP:
576 case IP_ADD_SOURCE_MEMBERSHIP:
577 case IP_BLOCK_SOURCE:
578 case IP_DROP_MEMBERSHIP:
579 case IP_DROP_SOURCE_MEMBERSHIP:
580 case IP_MSFILTER:
581 case IP_UNBLOCK_SOURCE:
582 case MCAST_BLOCK_SOURCE:
583 case MCAST_MSFILTER:
584 case MCAST_JOIN_GROUP:
585 case MCAST_JOIN_SOURCE_GROUP:
586 case MCAST_LEAVE_GROUP:
587 case MCAST_LEAVE_SOURCE_GROUP:
588 case MCAST_UNBLOCK_SOURCE:
589 case IP_ROUTER_ALERT:
590 return true;
591 }
592 return false;
593 }
594
595 static int do_ip_setsockopt(struct sock *sk, int level,
596 int optname, char __user *optval, unsigned int optlen)
597 {
598 struct inet_sock *inet = inet_sk(sk);
599 struct net *net = sock_net(sk);
600 int val = 0, err;
601 bool needs_rtnl = setsockopt_needs_rtnl(optname);
602
603 switch (optname) {
604 case IP_PKTINFO:
605 case IP_RECVTTL:
606 case IP_RECVOPTS:
607 case IP_RECVTOS:
608 case IP_RETOPTS:
609 case IP_TOS:
610 case IP_TTL:
611 case IP_HDRINCL:
612 case IP_MTU_DISCOVER:
613 case IP_RECVERR:
614 case IP_ROUTER_ALERT:
615 case IP_FREEBIND:
616 case IP_PASSSEC:
617 case IP_TRANSPARENT:
618 case IP_MINTTL:
619 case IP_NODEFRAG:
620 case IP_BIND_ADDRESS_NO_PORT:
621 case IP_UNICAST_IF:
622 case IP_MULTICAST_TTL:
623 case IP_MULTICAST_ALL:
624 case IP_MULTICAST_LOOP:
625 case IP_RECVORIGDSTADDR:
626 case IP_CHECKSUM:
627 case IP_RECVFRAGSIZE:
628 if (optlen >= sizeof(int)) {
629 if (get_user(val, (int __user *) optval))
630 return -EFAULT;
631 } else if (optlen >= sizeof(char)) {
632 unsigned char ucval;
633
634 if (get_user(ucval, (unsigned char __user *) optval))
635 return -EFAULT;
636 val = (int) ucval;
637 }
638 }
639
640 /* If optlen==0, it is equivalent to val == 0 */
641
642 if (ip_mroute_opt(optname))
643 return ip_mroute_setsockopt(sk, optname, optval, optlen);
644
645 err = 0;
646 if (needs_rtnl)
647 rtnl_lock();
648 lock_sock(sk);
649
650 switch (optname) {
651 case IP_OPTIONS:
652 {
653 struct ip_options_rcu *old, *opt = NULL;
654
655 if (optlen > 40)
656 goto e_inval;
657 err = ip_options_get_from_user(sock_net(sk), &opt,
658 optval, optlen);
659 if (err)
660 break;
661 old = rcu_dereference_protected(inet->inet_opt,
662 lockdep_sock_is_held(sk));
663 if (inet->is_icsk) {
664 struct inet_connection_sock *icsk = inet_csk(sk);
665 #if IS_ENABLED(CONFIG_IPV6)
666 if (sk->sk_family == PF_INET ||
667 (!((1 << sk->sk_state) &
668 (TCPF_LISTEN | TCPF_CLOSE)) &&
669 inet->inet_daddr != LOOPBACK4_IPV6)) {
670 #endif
671 if (old)
672 icsk->icsk_ext_hdr_len -= old->opt.optlen;
673 if (opt)
674 icsk->icsk_ext_hdr_len += opt->opt.optlen;
675 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
676 #if IS_ENABLED(CONFIG_IPV6)
677 }
678 #endif
679 }
680 rcu_assign_pointer(inet->inet_opt, opt);
681 if (old)
682 kfree_rcu(old, rcu);
683 break;
684 }
685 case IP_PKTINFO:
686 if (val)
687 inet->cmsg_flags |= IP_CMSG_PKTINFO;
688 else
689 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
690 break;
691 case IP_RECVTTL:
692 if (val)
693 inet->cmsg_flags |= IP_CMSG_TTL;
694 else
695 inet->cmsg_flags &= ~IP_CMSG_TTL;
696 break;
697 case IP_RECVTOS:
698 if (val)
699 inet->cmsg_flags |= IP_CMSG_TOS;
700 else
701 inet->cmsg_flags &= ~IP_CMSG_TOS;
702 break;
703 case IP_RECVOPTS:
704 if (val)
705 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
706 else
707 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
708 break;
709 case IP_RETOPTS:
710 if (val)
711 inet->cmsg_flags |= IP_CMSG_RETOPTS;
712 else
713 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
714 break;
715 case IP_PASSSEC:
716 if (val)
717 inet->cmsg_flags |= IP_CMSG_PASSSEC;
718 else
719 inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
720 break;
721 case IP_RECVORIGDSTADDR:
722 if (val)
723 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR;
724 else
725 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR;
726 break;
727 case IP_CHECKSUM:
728 if (val) {
729 if (!(inet->cmsg_flags & IP_CMSG_CHECKSUM)) {
730 inet_inc_convert_csum(sk);
731 inet->cmsg_flags |= IP_CMSG_CHECKSUM;
732 }
733 } else {
734 if (inet->cmsg_flags & IP_CMSG_CHECKSUM) {
735 inet_dec_convert_csum(sk);
736 inet->cmsg_flags &= ~IP_CMSG_CHECKSUM;
737 }
738 }
739 break;
740 case IP_RECVFRAGSIZE:
741 if (sk->sk_type != SOCK_RAW && sk->sk_type != SOCK_DGRAM)
742 goto e_inval;
743 if (val)
744 inet->cmsg_flags |= IP_CMSG_RECVFRAGSIZE;
745 else
746 inet->cmsg_flags &= ~IP_CMSG_RECVFRAGSIZE;
747 break;
748 case IP_TOS: /* This sets both TOS and Precedence */
749 if (sk->sk_type == SOCK_STREAM) {
750 val &= ~INET_ECN_MASK;
751 val |= inet->tos & INET_ECN_MASK;
752 }
753 if (inet->tos != val) {
754 inet->tos = val;
755 sk->sk_priority = rt_tos2priority(val);
756 sk_dst_reset(sk);
757 }
758 break;
759 case IP_TTL:
760 if (optlen < 1)
761 goto e_inval;
762 if (val != -1 && (val < 1 || val > 255))
763 goto e_inval;
764 inet->uc_ttl = val;
765 break;
766 case IP_HDRINCL:
767 if (sk->sk_type != SOCK_RAW) {
768 err = -ENOPROTOOPT;
769 break;
770 }
771 inet->hdrincl = val ? 1 : 0;
772 break;
773 case IP_NODEFRAG:
774 if (sk->sk_type != SOCK_RAW) {
775 err = -ENOPROTOOPT;
776 break;
777 }
778 inet->nodefrag = val ? 1 : 0;
779 break;
780 case IP_BIND_ADDRESS_NO_PORT:
781 inet->bind_address_no_port = val ? 1 : 0;
782 break;
783 case IP_MTU_DISCOVER:
784 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT)
785 goto e_inval;
786 inet->pmtudisc = val;
787 break;
788 case IP_RECVERR:
789 inet->recverr = !!val;
790 if (!val)
791 skb_queue_purge(&sk->sk_error_queue);
792 break;
793 case IP_MULTICAST_TTL:
794 if (sk->sk_type == SOCK_STREAM)
795 goto e_inval;
796 if (optlen < 1)
797 goto e_inval;
798 if (val == -1)
799 val = 1;
800 if (val < 0 || val > 255)
801 goto e_inval;
802 inet->mc_ttl = val;
803 break;
804 case IP_MULTICAST_LOOP:
805 if (optlen < 1)
806 goto e_inval;
807 inet->mc_loop = !!val;
808 break;
809 case IP_UNICAST_IF:
810 {
811 struct net_device *dev = NULL;
812 int ifindex;
813 int midx;
814
815 if (optlen != sizeof(int))
816 goto e_inval;
817
818 ifindex = (__force int)ntohl((__force __be32)val);
819 if (ifindex == 0) {
820 inet->uc_index = 0;
821 err = 0;
822 break;
823 }
824
825 dev = dev_get_by_index(sock_net(sk), ifindex);
826 err = -EADDRNOTAVAIL;
827 if (!dev)
828 break;
829
830 midx = l3mdev_master_ifindex(dev);
831 dev_put(dev);
832
833 err = -EINVAL;
834 if (sk->sk_bound_dev_if &&
835 (!midx || midx != sk->sk_bound_dev_if))
836 break;
837
838 inet->uc_index = ifindex;
839 err = 0;
840 break;
841 }
842 case IP_MULTICAST_IF:
843 {
844 struct ip_mreqn mreq;
845 struct net_device *dev = NULL;
846 int midx;
847
848 if (sk->sk_type == SOCK_STREAM)
849 goto e_inval;
850 /*
851 * Check the arguments are allowable
852 */
853
854 if (optlen < sizeof(struct in_addr))
855 goto e_inval;
856
857 err = -EFAULT;
858 if (optlen >= sizeof(struct ip_mreqn)) {
859 if (copy_from_user(&mreq, optval, sizeof(mreq)))
860 break;
861 } else {
862 memset(&mreq, 0, sizeof(mreq));
863 if (optlen >= sizeof(struct ip_mreq)) {
864 if (copy_from_user(&mreq, optval,
865 sizeof(struct ip_mreq)))
866 break;
867 } else if (optlen >= sizeof(struct in_addr)) {
868 if (copy_from_user(&mreq.imr_address, optval,
869 sizeof(struct in_addr)))
870 break;
871 }
872 }
873
874 if (!mreq.imr_ifindex) {
875 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
876 inet->mc_index = 0;
877 inet->mc_addr = 0;
878 err = 0;
879 break;
880 }
881 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
882 if (dev)
883 mreq.imr_ifindex = dev->ifindex;
884 } else
885 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
886
887
888 err = -EADDRNOTAVAIL;
889 if (!dev)
890 break;
891
892 midx = l3mdev_master_ifindex(dev);
893
894 dev_put(dev);
895
896 err = -EINVAL;
897 if (sk->sk_bound_dev_if &&
898 mreq.imr_ifindex != sk->sk_bound_dev_if &&
899 (!midx || midx != sk->sk_bound_dev_if))
900 break;
901
902 inet->mc_index = mreq.imr_ifindex;
903 inet->mc_addr = mreq.imr_address.s_addr;
904 err = 0;
905 break;
906 }
907
908 case IP_ADD_MEMBERSHIP:
909 case IP_DROP_MEMBERSHIP:
910 {
911 struct ip_mreqn mreq;
912
913 err = -EPROTO;
914 if (inet_sk(sk)->is_icsk)
915 break;
916
917 if (optlen < sizeof(struct ip_mreq))
918 goto e_inval;
919 err = -EFAULT;
920 if (optlen >= sizeof(struct ip_mreqn)) {
921 if (copy_from_user(&mreq, optval, sizeof(mreq)))
922 break;
923 } else {
924 memset(&mreq, 0, sizeof(mreq));
925 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq)))
926 break;
927 }
928
929 if (optname == IP_ADD_MEMBERSHIP)
930 err = ip_mc_join_group(sk, &mreq);
931 else
932 err = ip_mc_leave_group(sk, &mreq);
933 break;
934 }
935 case IP_MSFILTER:
936 {
937 struct ip_msfilter *msf;
938
939 if (optlen < IP_MSFILTER_SIZE(0))
940 goto e_inval;
941 if (optlen > sysctl_optmem_max) {
942 err = -ENOBUFS;
943 break;
944 }
945 msf = memdup_user(optval, optlen);
946 if (IS_ERR(msf)) {
947 err = PTR_ERR(msf);
948 break;
949 }
950 /* numsrc >= (1G-4) overflow in 32 bits */
951 if (msf->imsf_numsrc >= 0x3ffffffcU ||
952 msf->imsf_numsrc > net->ipv4.sysctl_igmp_max_msf) {
953 kfree(msf);
954 err = -ENOBUFS;
955 break;
956 }
957 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
958 kfree(msf);
959 err = -EINVAL;
960 break;
961 }
962 err = ip_mc_msfilter(sk, msf, 0);
963 kfree(msf);
964 break;
965 }
966 case IP_BLOCK_SOURCE:
967 case IP_UNBLOCK_SOURCE:
968 case IP_ADD_SOURCE_MEMBERSHIP:
969 case IP_DROP_SOURCE_MEMBERSHIP:
970 {
971 struct ip_mreq_source mreqs;
972 int omode, add;
973
974 if (optlen != sizeof(struct ip_mreq_source))
975 goto e_inval;
976 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
977 err = -EFAULT;
978 break;
979 }
980 if (optname == IP_BLOCK_SOURCE) {
981 omode = MCAST_EXCLUDE;
982 add = 1;
983 } else if (optname == IP_UNBLOCK_SOURCE) {
984 omode = MCAST_EXCLUDE;
985 add = 0;
986 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
987 struct ip_mreqn mreq;
988
989 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
990 mreq.imr_address.s_addr = mreqs.imr_interface;
991 mreq.imr_ifindex = 0;
992 err = ip_mc_join_group(sk, &mreq);
993 if (err && err != -EADDRINUSE)
994 break;
995 omode = MCAST_INCLUDE;
996 add = 1;
997 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
998 omode = MCAST_INCLUDE;
999 add = 0;
1000 }
1001 err = ip_mc_source(add, omode, sk, &mreqs, 0);
1002 break;
1003 }
1004 case MCAST_JOIN_GROUP:
1005 case MCAST_LEAVE_GROUP:
1006 {
1007 struct group_req greq;
1008 struct sockaddr_in *psin;
1009 struct ip_mreqn mreq;
1010
1011 if (optlen < sizeof(struct group_req))
1012 goto e_inval;
1013 err = -EFAULT;
1014 if (copy_from_user(&greq, optval, sizeof(greq)))
1015 break;
1016 psin = (struct sockaddr_in *)&greq.gr_group;
1017 if (psin->sin_family != AF_INET)
1018 goto e_inval;
1019 memset(&mreq, 0, sizeof(mreq));
1020 mreq.imr_multiaddr = psin->sin_addr;
1021 mreq.imr_ifindex = greq.gr_interface;
1022
1023 if (optname == MCAST_JOIN_GROUP)
1024 err = ip_mc_join_group(sk, &mreq);
1025 else
1026 err = ip_mc_leave_group(sk, &mreq);
1027 break;
1028 }
1029 case MCAST_JOIN_SOURCE_GROUP:
1030 case MCAST_LEAVE_SOURCE_GROUP:
1031 case MCAST_BLOCK_SOURCE:
1032 case MCAST_UNBLOCK_SOURCE:
1033 {
1034 struct group_source_req greqs;
1035 struct ip_mreq_source mreqs;
1036 struct sockaddr_in *psin;
1037 int omode, add;
1038
1039 if (optlen != sizeof(struct group_source_req))
1040 goto e_inval;
1041 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
1042 err = -EFAULT;
1043 break;
1044 }
1045 if (greqs.gsr_group.ss_family != AF_INET ||
1046 greqs.gsr_source.ss_family != AF_INET) {
1047 err = -EADDRNOTAVAIL;
1048 break;
1049 }
1050 psin = (struct sockaddr_in *)&greqs.gsr_group;
1051 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
1052 psin = (struct sockaddr_in *)&greqs.gsr_source;
1053 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
1054 mreqs.imr_interface = 0; /* use index for mc_source */
1055
1056 if (optname == MCAST_BLOCK_SOURCE) {
1057 omode = MCAST_EXCLUDE;
1058 add = 1;
1059 } else if (optname == MCAST_UNBLOCK_SOURCE) {
1060 omode = MCAST_EXCLUDE;
1061 add = 0;
1062 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
1063 struct ip_mreqn mreq;
1064
1065 psin = (struct sockaddr_in *)&greqs.gsr_group;
1066 mreq.imr_multiaddr = psin->sin_addr;
1067 mreq.imr_address.s_addr = 0;
1068 mreq.imr_ifindex = greqs.gsr_interface;
1069 err = ip_mc_join_group(sk, &mreq);
1070 if (err && err != -EADDRINUSE)
1071 break;
1072 greqs.gsr_interface = mreq.imr_ifindex;
1073 omode = MCAST_INCLUDE;
1074 add = 1;
1075 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
1076 omode = MCAST_INCLUDE;
1077 add = 0;
1078 }
1079 err = ip_mc_source(add, omode, sk, &mreqs,
1080 greqs.gsr_interface);
1081 break;
1082 }
1083 case MCAST_MSFILTER:
1084 {
1085 struct sockaddr_in *psin;
1086 struct ip_msfilter *msf = NULL;
1087 struct group_filter *gsf = NULL;
1088 int msize, i, ifindex;
1089
1090 if (optlen < GROUP_FILTER_SIZE(0))
1091 goto e_inval;
1092 if (optlen > sysctl_optmem_max) {
1093 err = -ENOBUFS;
1094 break;
1095 }
1096 gsf = memdup_user(optval, optlen);
1097 if (IS_ERR(gsf)) {
1098 err = PTR_ERR(gsf);
1099 break;
1100 }
1101
1102 /* numsrc >= (4G-140)/128 overflow in 32 bits */
1103 if (gsf->gf_numsrc >= 0x1ffffff ||
1104 gsf->gf_numsrc > net->ipv4.sysctl_igmp_max_msf) {
1105 err = -ENOBUFS;
1106 goto mc_msf_out;
1107 }
1108 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
1109 err = -EINVAL;
1110 goto mc_msf_out;
1111 }
1112 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
1113 msf = kmalloc(msize, GFP_KERNEL);
1114 if (!msf) {
1115 err = -ENOBUFS;
1116 goto mc_msf_out;
1117 }
1118 ifindex = gsf->gf_interface;
1119 psin = (struct sockaddr_in *)&gsf->gf_group;
1120 if (psin->sin_family != AF_INET) {
1121 err = -EADDRNOTAVAIL;
1122 goto mc_msf_out;
1123 }
1124 msf->imsf_multiaddr = psin->sin_addr.s_addr;
1125 msf->imsf_interface = 0;
1126 msf->imsf_fmode = gsf->gf_fmode;
1127 msf->imsf_numsrc = gsf->gf_numsrc;
1128 err = -EADDRNOTAVAIL;
1129 for (i = 0; i < gsf->gf_numsrc; ++i) {
1130 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
1131
1132 if (psin->sin_family != AF_INET)
1133 goto mc_msf_out;
1134 msf->imsf_slist[i] = psin->sin_addr.s_addr;
1135 }
1136 kfree(gsf);
1137 gsf = NULL;
1138
1139 err = ip_mc_msfilter(sk, msf, ifindex);
1140 mc_msf_out:
1141 kfree(msf);
1142 kfree(gsf);
1143 break;
1144 }
1145 case IP_MULTICAST_ALL:
1146 if (optlen < 1)
1147 goto e_inval;
1148 if (val != 0 && val != 1)
1149 goto e_inval;
1150 inet->mc_all = val;
1151 break;
1152 case IP_ROUTER_ALERT:
1153 err = ip_ra_control(sk, val ? 1 : 0, NULL);
1154 break;
1155
1156 case IP_FREEBIND:
1157 if (optlen < 1)
1158 goto e_inval;
1159 inet->freebind = !!val;
1160 break;
1161
1162 case IP_IPSEC_POLICY:
1163 case IP_XFRM_POLICY:
1164 err = -EPERM;
1165 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1166 break;
1167 err = xfrm_user_policy(sk, optname, optval, optlen);
1168 break;
1169
1170 case IP_TRANSPARENT:
1171 if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) &&
1172 !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
1173 err = -EPERM;
1174 break;
1175 }
1176 if (optlen < 1)
1177 goto e_inval;
1178 inet->transparent = !!val;
1179 break;
1180
1181 case IP_MINTTL:
1182 if (optlen < 1)
1183 goto e_inval;
1184 if (val < 0 || val > 255)
1185 goto e_inval;
1186 inet->min_ttl = val;
1187 break;
1188
1189 default:
1190 err = -ENOPROTOOPT;
1191 break;
1192 }
1193 release_sock(sk);
1194 if (needs_rtnl)
1195 rtnl_unlock();
1196 return err;
1197
1198 e_inval:
1199 release_sock(sk);
1200 if (needs_rtnl)
1201 rtnl_unlock();
1202 return -EINVAL;
1203 }
1204
1205 /**
1206 * ipv4_pktinfo_prepare - transfer some info from rtable to skb
1207 * @sk: socket
1208 * @skb: buffer
1209 *
1210 * To support IP_CMSG_PKTINFO option, we store rt_iif and specific
1211 * destination in skb->cb[] before dst drop.
1212 * This way, receiver doesn't make cache line misses to read rtable.
1213 */
1214 void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb)
1215 {
1216 struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb);
1217 bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) ||
1218 ipv6_sk_rxinfo(sk);
1219
1220 if (prepare && skb_rtable(skb)) {
1221 /* skb->cb is overloaded: prior to this point it is IP{6}CB
1222 * which has interface index (iif) as the first member of the
1223 * underlying inet{6}_skb_parm struct. This code then overlays
1224 * PKTINFO_SKB_CB and in_pktinfo also has iif as the first
1225 * element so the iif is picked up from the prior IPCB. If iif
1226 * is the loopback interface, then return the sending interface
1227 * (e.g., process binds socket to eth0 for Tx which is
1228 * redirected to loopback in the rtable/dst).
1229 */
1230 struct rtable *rt = skb_rtable(skb);
1231 bool l3slave = ipv4_l3mdev_skb(IPCB(skb)->flags);
1232
1233 if (pktinfo->ipi_ifindex == LOOPBACK_IFINDEX)
1234 pktinfo->ipi_ifindex = inet_iif(skb);
1235 else if (l3slave && rt && rt->rt_iif)
1236 pktinfo->ipi_ifindex = rt->rt_iif;
1237
1238 pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb);
1239 } else {
1240 pktinfo->ipi_ifindex = 0;
1241 pktinfo->ipi_spec_dst.s_addr = 0;
1242 }
1243 skb_dst_drop(skb);
1244 }
1245
1246 int ip_setsockopt(struct sock *sk, int level,
1247 int optname, char __user *optval, unsigned int optlen)
1248 {
1249 int err;
1250
1251 if (level != SOL_IP)
1252 return -ENOPROTOOPT;
1253
1254 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1255 #ifdef CONFIG_NETFILTER
1256 /* we need to exclude all possible ENOPROTOOPTs except default case */
1257 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
1258 optname != IP_IPSEC_POLICY &&
1259 optname != IP_XFRM_POLICY &&
1260 !ip_mroute_opt(optname))
1261 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
1262 #endif
1263 return err;
1264 }
1265 EXPORT_SYMBOL(ip_setsockopt);
1266
1267 #ifdef CONFIG_COMPAT
1268 int compat_ip_setsockopt(struct sock *sk, int level, int optname,
1269 char __user *optval, unsigned int optlen)
1270 {
1271 int err;
1272
1273 if (level != SOL_IP)
1274 return -ENOPROTOOPT;
1275
1276 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
1277 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
1278 ip_setsockopt);
1279
1280 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1281 #ifdef CONFIG_NETFILTER
1282 /* we need to exclude all possible ENOPROTOOPTs except default case */
1283 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
1284 optname != IP_IPSEC_POLICY &&
1285 optname != IP_XFRM_POLICY &&
1286 !ip_mroute_opt(optname))
1287 err = compat_nf_setsockopt(sk, PF_INET, optname, optval,
1288 optlen);
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 err = nf_getsockopt(sk, PF_INET, optname, optval, &len);
1573 if (err >= 0)
1574 err = put_user(len, optlen);
1575 return err;
1576 }
1577 #endif
1578 return err;
1579 }
1580 EXPORT_SYMBOL(ip_getsockopt);
1581
1582 #ifdef CONFIG_COMPAT
1583 int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1584 char __user *optval, int __user *optlen)
1585 {
1586 int err;
1587
1588 if (optname == MCAST_MSFILTER)
1589 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1590 ip_getsockopt);
1591
1592 err = do_ip_getsockopt(sk, level, optname, optval, optlen,
1593 MSG_CMSG_COMPAT);
1594
1595 #ifdef CONFIG_NETFILTER
1596 /* we need to exclude all possible ENOPROTOOPTs except default case */
1597 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1598 !ip_mroute_opt(optname)) {
1599 int len;
1600
1601 if (get_user(len, optlen))
1602 return -EFAULT;
1603
1604 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
1605 if (err >= 0)
1606 err = put_user(len, optlen);
1607 return err;
1608 }
1609 #endif
1610 return err;
1611 }
1612 EXPORT_SYMBOL(compat_ip_getsockopt);
1613 #endif
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