blob: 23e6ab0a2dc0ea070b6a86548b7761f7dbda00d4 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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.
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09007 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 * Authors: see ip.c
9 *
10 * Fixes:
11 * Many : Split from ip.c , see ip.c for history.
12 * Martin Mares : TOS setting fixed.
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +090013 * Alan Cox : Fixed a couple of oopses in Martin's
Linus Torvalds1da177e2005-04-16 15:20:36 -070014 * TOS tweaks.
15 * Mike McLagan : Routing by source
16 */
17
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include <linux/module.h>
19#include <linux/types.h>
20#include <linux/mm.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#include <linux/skbuff.h>
22#include <linux/ip.h>
23#include <linux/icmp.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020024#include <linux/inetdevice.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include <linux/netdevice.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090026#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include <net/sock.h>
28#include <net/ip.h>
29#include <net/icmp.h>
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -080030#include <net/tcp_states.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <linux/udp.h>
32#include <linux/igmp.h>
33#include <linux/netfilter.h>
34#include <linux/route.h>
35#include <linux/mroute.h>
Maciej Żenczykowski2c67e9a2011-10-22 00:07:47 -040036#include <net/inet_ecn.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070037#include <net/route.h>
38#include <net/xfrm.h>
David L Stevensdae50292008-04-27 01:06:07 -070039#include <net/compat.h>
Eric Dumazetdfd56b82011-12-10 09:48:31 +000040#if IS_ENABLED(CONFIG_IPV6)
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#include <net/transp_v6.h>
42#endif
David S. Miller35ebf652012-06-28 03:59:11 -070043#include <net/ip_fib.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070044
45#include <linux/errqueue.h>
46#include <asm/uaccess.h>
47
48#define IP_CMSG_PKTINFO 1
49#define IP_CMSG_TTL 2
50#define IP_CMSG_TOS 4
51#define IP_CMSG_RECVOPTS 8
52#define IP_CMSG_RETOPTS 16
Catherine Zhang2c7946a2006-03-20 22:41:23 -080053#define IP_CMSG_PASSSEC 32
Balazs Scheidlere8b2dfe2008-11-16 19:32:39 -080054#define IP_CMSG_ORIGDSTADDR 64
Linus Torvalds1da177e2005-04-16 15:20:36 -070055
56/*
57 * SOL_IP control messages.
58 */
Eric Dumazetd826eb12011-11-09 07:24:35 +000059#define PKTINFO_SKB_CB(__skb) ((struct in_pktinfo *)((__skb)->cb))
Linus Torvalds1da177e2005-04-16 15:20:36 -070060
61static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
62{
Eric Dumazetd826eb12011-11-09 07:24:35 +000063 struct in_pktinfo info = *PKTINFO_SKB_CB(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070064
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -070065 info.ipi_addr.s_addr = ip_hdr(skb)->daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -070066
67 put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
68}
69
70static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
71{
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -070072 int ttl = ip_hdr(skb)->ttl;
Linus Torvalds1da177e2005-04-16 15:20:36 -070073 put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
74}
75
76static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
77{
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -070078 put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos);
Linus Torvalds1da177e2005-04-16 15:20:36 -070079}
80
81static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
82{
83 if (IPCB(skb)->opt.optlen == 0)
84 return;
85
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -070086 put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen,
87 ip_hdr(skb) + 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -070088}
89
90
91static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb)
92{
93 unsigned char optbuf[sizeof(struct ip_options) + 40];
Daniel Baluta5e73ea12012-04-15 01:34:41 +000094 struct ip_options *opt = (struct ip_options *)optbuf;
Linus Torvalds1da177e2005-04-16 15:20:36 -070095
96 if (IPCB(skb)->opt.optlen == 0)
97 return;
98
99 if (ip_options_echo(opt, skb)) {
100 msg->msg_flags |= MSG_CTRUNC;
101 return;
102 }
103 ip_options_undo(opt);
104
105 put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data);
106}
107
Catherine Zhang2c7946a2006-03-20 22:41:23 -0800108static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
109{
110 char *secdata;
Catherine Zhangdc49c1f2006-08-02 14:12:06 -0700111 u32 seclen, secid;
Catherine Zhang2c7946a2006-03-20 22:41:23 -0800112 int err;
113
Catherine Zhangdc49c1f2006-08-02 14:12:06 -0700114 err = security_socket_getpeersec_dgram(NULL, skb, &secid);
115 if (err)
116 return;
117
118 err = security_secid_to_secctx(secid, &secdata, &seclen);
Catherine Zhang2c7946a2006-03-20 22:41:23 -0800119 if (err)
120 return;
121
122 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
Catherine Zhangdc49c1f2006-08-02 14:12:06 -0700123 security_release_secctx(secdata, seclen);
Catherine Zhang2c7946a2006-03-20 22:41:23 -0800124}
125
Harvey Harrison21d1a162008-11-20 01:54:27 -0800126static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
Balazs Scheidlere8b2dfe2008-11-16 19:32:39 -0800127{
128 struct sockaddr_in sin;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000129 const struct iphdr *iph = ip_hdr(skb);
Harvey Harrison21d1a162008-11-20 01:54:27 -0800130 __be16 *ports = (__be16 *)skb_transport_header(skb);
Balazs Scheidlere8b2dfe2008-11-16 19:32:39 -0800131
132 if (skb_transport_offset(skb) + 4 > skb->len)
133 return;
134
135 /* All current transport protocols have the port numbers in the
136 * first four bytes of the transport header and this function is
137 * written with this assumption in mind.
138 */
139
140 sin.sin_family = AF_INET;
141 sin.sin_addr.s_addr = iph->daddr;
142 sin.sin_port = ports[1];
143 memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
144
145 put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin);
146}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147
148void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
149{
150 struct inet_sock *inet = inet_sk(skb->sk);
Eric Dumazet95c96172012-04-15 05:58:06 +0000151 unsigned int flags = inet->cmsg_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152
153 /* Ordered by supposed usage frequency */
154 if (flags & 1)
155 ip_cmsg_recv_pktinfo(msg, skb);
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700156 if ((flags >>= 1) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 return;
158
159 if (flags & 1)
160 ip_cmsg_recv_ttl(msg, skb);
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700161 if ((flags >>= 1) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 return;
163
164 if (flags & 1)
165 ip_cmsg_recv_tos(msg, skb);
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700166 if ((flags >>= 1) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 return;
168
169 if (flags & 1)
170 ip_cmsg_recv_opts(msg, skb);
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700171 if ((flags >>= 1) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 return;
173
174 if (flags & 1)
175 ip_cmsg_recv_retopts(msg, skb);
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700176 if ((flags >>= 1) == 0)
Catherine Zhang2c7946a2006-03-20 22:41:23 -0800177 return;
178
179 if (flags & 1)
180 ip_cmsg_recv_security(msg, skb);
Balazs Scheidlere8b2dfe2008-11-16 19:32:39 -0800181
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700182 if ((flags >>= 1) == 0)
Balazs Scheidlere8b2dfe2008-11-16 19:32:39 -0800183 return;
184 if (flags & 1)
185 ip_cmsg_recv_dstaddr(msg, skb);
186
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187}
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700188EXPORT_SYMBOL(ip_cmsg_recv);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189
Denis V. Lunev7a6adb92008-03-24 15:30:27 -0700190int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191{
192 int err;
193 struct cmsghdr *cmsg;
194
195 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
196 if (!CMSG_OK(msg, cmsg))
197 return -EINVAL;
198 if (cmsg->cmsg_level != SOL_IP)
199 continue;
200 switch (cmsg->cmsg_type) {
201 case IP_RETOPTS:
202 err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700203 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg),
204 err < 40 ? err : 40);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 if (err)
206 return err;
207 break;
208 case IP_PKTINFO:
209 {
210 struct in_pktinfo *info;
211 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
212 return -EINVAL;
213 info = (struct in_pktinfo *)CMSG_DATA(cmsg);
214 ipc->oif = info->ipi_ifindex;
215 ipc->addr = info->ipi_spec_dst.s_addr;
216 break;
217 }
218 default:
219 return -EINVAL;
220 }
221 }
222 return 0;
223}
224
225
226/* Special input handler for packets caught by router alert option.
227 They are selected only by protocol field, and then processed likely
228 local ones; but only if someone wants them! Otherwise, router
229 not running rsvpd will kill RSVP.
230
231 It is user level problem, what it will make with them.
232 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
233 but receiver should be enough clever f.e. to forward mtrace requests,
234 sent to multicast group to reach destination designated router.
235 */
Eric Dumazet43a951e2010-10-25 03:32:44 +0000236struct ip_ra_chain __rcu *ip_ra_chain;
Eric Dumazet66018502010-06-07 03:12:08 +0000237static DEFINE_SPINLOCK(ip_ra_lock);
238
Eric Dumazet592fcb92010-06-09 16:21:07 +0000239
240static void ip_ra_destroy_rcu(struct rcu_head *head)
Eric Dumazet66018502010-06-07 03:12:08 +0000241{
Eric Dumazet592fcb92010-06-09 16:21:07 +0000242 struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu);
243
244 sock_put(ra->saved_sk);
245 kfree(ra);
Eric Dumazet66018502010-06-07 03:12:08 +0000246}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700248int ip_ra_control(struct sock *sk, unsigned char on,
249 void (*destructor)(struct sock *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250{
Eric Dumazet43a951e2010-10-25 03:32:44 +0000251 struct ip_ra_chain *ra, *new_ra;
252 struct ip_ra_chain __rcu **rap;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000254 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 return -EINVAL;
256
257 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
258
Eric Dumazet66018502010-06-07 03:12:08 +0000259 spin_lock_bh(&ip_ra_lock);
Eric Dumazet43a951e2010-10-25 03:32:44 +0000260 for (rap = &ip_ra_chain;
261 (ra = rcu_dereference_protected(*rap,
262 lockdep_is_held(&ip_ra_lock))) != NULL;
263 rap = &ra->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 if (ra->sk == sk) {
265 if (on) {
Eric Dumazet66018502010-06-07 03:12:08 +0000266 spin_unlock_bh(&ip_ra_lock);
Jesper Juhla51482b2005-11-08 09:41:34 -0800267 kfree(new_ra);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 return -EADDRINUSE;
269 }
Eric Dumazet592fcb92010-06-09 16:21:07 +0000270 /* dont let ip_call_ra_chain() use sk again */
271 ra->sk = NULL;
Eric Dumazet66018502010-06-07 03:12:08 +0000272 rcu_assign_pointer(*rap, ra->next);
273 spin_unlock_bh(&ip_ra_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274
275 if (ra->destructor)
276 ra->destructor(sk);
Eric Dumazet592fcb92010-06-09 16:21:07 +0000277 /*
278 * Delay sock_put(sk) and kfree(ra) after one rcu grace
279 * period. This guarantee ip_call_ra_chain() dont need
280 * to mess with socket refcounts.
281 */
282 ra->saved_sk = sk;
283 call_rcu(&ra->rcu, ip_ra_destroy_rcu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 return 0;
285 }
286 }
287 if (new_ra == NULL) {
Eric Dumazet66018502010-06-07 03:12:08 +0000288 spin_unlock_bh(&ip_ra_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 return -ENOBUFS;
290 }
291 new_ra->sk = sk;
292 new_ra->destructor = destructor;
293
294 new_ra->next = ra;
Eric Dumazet66018502010-06-07 03:12:08 +0000295 rcu_assign_pointer(*rap, new_ra);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 sock_hold(sk);
Eric Dumazet66018502010-06-07 03:12:08 +0000297 spin_unlock_bh(&ip_ra_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298
299 return 0;
300}
301
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900302void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
Al Viro35986b32006-09-27 18:34:21 -0700303 __be16 port, u32 info, u8 *payload)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 struct sock_exterr_skb *serr;
306
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 skb = skb_clone(skb, GFP_ATOMIC);
308 if (!skb)
309 return;
310
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900311 serr = SKB_EXT_ERR(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 serr->ee.ee_errno = err;
313 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
Arnaldo Carvalho de Melo88c76642007-03-13 14:43:18 -0300314 serr->ee.ee_type = icmp_hdr(skb)->type;
315 serr->ee.ee_code = icmp_hdr(skb)->code;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 serr->ee.ee_pad = 0;
317 serr->ee.ee_info = info;
318 serr->ee.ee_data = 0;
Arnaldo Carvalho de Melo88c76642007-03-13 14:43:18 -0300319 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700320 skb_network_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 serr->port = port;
322
Arnaldo Carvalho de Melobd823932007-03-13 17:10:43 -0300323 if (skb_pull(skb, payload - skb->data) != NULL) {
324 skb_reset_transport_header(skb);
325 if (sock_queue_err_skb(sk, skb) == 0)
326 return;
327 }
328 kfree_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329}
330
Al Viro05790162006-09-27 18:33:40 -0700331void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332{
333 struct inet_sock *inet = inet_sk(sk);
334 struct sock_exterr_skb *serr;
335 struct iphdr *iph;
336 struct sk_buff *skb;
337
338 if (!inet->recverr)
339 return;
340
341 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
342 if (!skb)
343 return;
344
Arnaldo Carvalho de Melo2ca9e6f2007-03-10 19:15:25 -0300345 skb_put(skb, sizeof(struct iphdr));
346 skb_reset_network_header(skb);
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700347 iph = ip_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 iph->daddr = daddr;
349
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900350 serr = SKB_EXT_ERR(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 serr->ee.ee_errno = err;
352 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900353 serr->ee.ee_type = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 serr->ee.ee_code = 0;
355 serr->ee.ee_pad = 0;
356 serr->ee.ee_info = info;
357 serr->ee.ee_data = 0;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700358 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 serr->port = port;
360
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700361 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
Arnaldo Carvalho de Melobd823932007-03-13 17:10:43 -0300362 skb_reset_transport_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363
364 if (sock_queue_err_skb(sk, skb))
365 kfree_skb(skb);
366}
367
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900368/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 * Handle MSG_ERRQUEUE
370 */
Hannes Frederic Sowa08c62a12013-11-23 00:46:12 +0100371int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372{
373 struct sock_exterr_skb *serr;
374 struct sk_buff *skb, *skb2;
375 struct sockaddr_in *sin;
376 struct {
377 struct sock_extended_err ee;
378 struct sockaddr_in offender;
379 } errhdr;
380 int err;
381 int copied;
382
383 err = -EAGAIN;
384 skb = skb_dequeue(&sk->sk_error_queue);
385 if (skb == NULL)
386 goto out;
387
388 copied = skb->len;
389 if (copied > len) {
390 msg->msg_flags |= MSG_TRUNC;
391 copied = len;
392 }
393 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
394 if (err)
395 goto out_free_skb;
396
397 sock_recv_timestamp(msg, sk, skb);
398
399 serr = SKB_EXT_ERR(skb);
400
401 sin = (struct sockaddr_in *)msg->msg_name;
402 if (sin) {
403 sin->sin_family = AF_INET;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700404 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
405 serr->addr_offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 sin->sin_port = serr->port;
407 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
Hannes Frederic Sowa08c62a12013-11-23 00:46:12 +0100408 *addr_len = sizeof(*sin);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 }
410
411 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
412 sin = &errhdr.offender;
413 sin->sin_family = AF_UNSPEC;
414 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
415 struct inet_sock *inet = inet_sk(sk);
416
417 sin->sin_family = AF_INET;
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700418 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 sin->sin_port = 0;
420 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
421 if (inet->cmsg_flags)
422 ip_cmsg_recv(msg, skb);
423 }
424
425 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
426
427 /* Now we could try to dump offended packet options */
428
429 msg->msg_flags |= MSG_ERRQUEUE;
430 err = copied;
431
432 /* Reset and regenerate socket error */
Herbert Xue0f9f852005-06-18 22:56:18 -0700433 spin_lock_bh(&sk->sk_error_queue.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 sk->sk_err = 0;
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700435 skb2 = skb_peek(&sk->sk_error_queue);
436 if (skb2 != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
Herbert Xue0f9f852005-06-18 22:56:18 -0700438 spin_unlock_bh(&sk->sk_error_queue.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 sk->sk_error_report(sk);
440 } else
Herbert Xue0f9f852005-06-18 22:56:18 -0700441 spin_unlock_bh(&sk->sk_error_queue.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900443out_free_skb:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 kfree_skb(skb);
445out:
446 return err;
447}
448
449
450/*
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700451 * Socket option code for IP. This is the end of the line after any
452 * TCP,UDP etc options on an IP socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 */
454
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800455static int do_ip_setsockopt(struct sock *sk, int level,
David S. Millerb7058842009-09-30 16:12:20 -0700456 int optname, char __user *optval, unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457{
458 struct inet_sock *inet = inet_sk(sk);
Jianjun Kong09cb1052008-11-03 00:27:11 -0800459 int val = 0, err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460
Xi Wang0c9f79b2012-11-11 11:20:01 +0000461 switch (optname) {
462 case IP_PKTINFO:
463 case IP_RECVTTL:
464 case IP_RECVOPTS:
465 case IP_RECVTOS:
466 case IP_RETOPTS:
467 case IP_TOS:
468 case IP_TTL:
469 case IP_HDRINCL:
470 case IP_MTU_DISCOVER:
471 case IP_RECVERR:
472 case IP_ROUTER_ALERT:
473 case IP_FREEBIND:
474 case IP_PASSSEC:
475 case IP_TRANSPARENT:
476 case IP_MINTTL:
477 case IP_NODEFRAG:
478 case IP_UNICAST_IF:
479 case IP_MULTICAST_TTL:
480 case IP_MULTICAST_ALL:
481 case IP_MULTICAST_LOOP:
482 case IP_RECVORIGDSTADDR:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 if (optlen >= sizeof(int)) {
484 if (get_user(val, (int __user *) optval))
485 return -EFAULT;
486 } else if (optlen >= sizeof(char)) {
487 unsigned char ucval;
488
489 if (get_user(ucval, (unsigned char __user *) optval))
490 return -EFAULT;
491 val = (int) ucval;
492 }
493 }
494
495 /* If optlen==0, it is equivalent to val == 0 */
496
Pavel Emelyanov6a9fb942007-11-05 21:32:31 -0800497 if (ip_mroute_opt(optname))
Jianjun Kong09cb1052008-11-03 00:27:11 -0800498 return ip_mroute_setsockopt(sk, optname, optval, optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499
500 err = 0;
501 lock_sock(sk);
502
503 switch (optname) {
Stephen Hemminger132adf52007-03-08 20:44:43 -0800504 case IP_OPTIONS:
505 {
Eric Dumazetf6d8bd02011-04-21 09:45:37 +0000506 struct ip_options_rcu *old, *opt = NULL;
507
roel kluin65a1c4f2009-10-23 05:59:21 +0000508 if (optlen > 40)
Stephen Hemminger132adf52007-03-08 20:44:43 -0800509 goto e_inval;
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900510 err = ip_options_get_from_user(sock_net(sk), &opt,
Denis V. Lunevcb846632008-03-24 15:31:00 -0700511 optval, optlen);
Stephen Hemminger132adf52007-03-08 20:44:43 -0800512 if (err)
513 break;
Eric Dumazetf6d8bd02011-04-21 09:45:37 +0000514 old = rcu_dereference_protected(inet->inet_opt,
515 sock_owned_by_user(sk));
Stephen Hemminger132adf52007-03-08 20:44:43 -0800516 if (inet->is_icsk) {
517 struct inet_connection_sock *icsk = inet_csk(sk);
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000518#if IS_ENABLED(CONFIG_IPV6)
Stephen Hemminger132adf52007-03-08 20:44:43 -0800519 if (sk->sk_family == PF_INET ||
520 (!((1 << sk->sk_state) &
521 (TCPF_LISTEN | TCPF_CLOSE)) &&
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000522 inet->inet_daddr != LOOPBACK4_IPV6)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523#endif
Eric Dumazetf6d8bd02011-04-21 09:45:37 +0000524 if (old)
525 icsk->icsk_ext_hdr_len -= old->opt.optlen;
Stephen Hemminger132adf52007-03-08 20:44:43 -0800526 if (opt)
Eric Dumazetf6d8bd02011-04-21 09:45:37 +0000527 icsk->icsk_ext_hdr_len += opt->opt.optlen;
Stephen Hemminger132adf52007-03-08 20:44:43 -0800528 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000529#if IS_ENABLED(CONFIG_IPV6)
Stephen Hemminger132adf52007-03-08 20:44:43 -0800530 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 }
Eric Dumazetf6d8bd02011-04-21 09:45:37 +0000533 rcu_assign_pointer(inet->inet_opt, opt);
534 if (old)
Paul E. McKenney605b4af2012-01-06 17:08:33 -0800535 kfree_rcu(old, rcu);
Stephen Hemminger132adf52007-03-08 20:44:43 -0800536 break;
537 }
538 case IP_PKTINFO:
539 if (val)
540 inet->cmsg_flags |= IP_CMSG_PKTINFO;
541 else
542 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
543 break;
544 case IP_RECVTTL:
545 if (val)
546 inet->cmsg_flags |= IP_CMSG_TTL;
547 else
548 inet->cmsg_flags &= ~IP_CMSG_TTL;
549 break;
550 case IP_RECVTOS:
551 if (val)
552 inet->cmsg_flags |= IP_CMSG_TOS;
553 else
554 inet->cmsg_flags &= ~IP_CMSG_TOS;
555 break;
556 case IP_RECVOPTS:
557 if (val)
558 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
559 else
560 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
561 break;
562 case IP_RETOPTS:
563 if (val)
564 inet->cmsg_flags |= IP_CMSG_RETOPTS;
565 else
566 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
567 break;
568 case IP_PASSSEC:
569 if (val)
570 inet->cmsg_flags |= IP_CMSG_PASSSEC;
571 else
572 inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
573 break;
Balazs Scheidlere8b2dfe2008-11-16 19:32:39 -0800574 case IP_RECVORIGDSTADDR:
575 if (val)
576 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR;
577 else
578 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR;
579 break;
Stephen Hemminger132adf52007-03-08 20:44:43 -0800580 case IP_TOS: /* This sets both TOS and Precedence */
581 if (sk->sk_type == SOCK_STREAM) {
Maciej Żenczykowski2c67e9a2011-10-22 00:07:47 -0400582 val &= ~INET_ECN_MASK;
583 val |= inet->tos & INET_ECN_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584 }
Stephen Hemminger132adf52007-03-08 20:44:43 -0800585 if (inet->tos != val) {
586 inet->tos = val;
587 sk->sk_priority = rt_tos2priority(val);
588 sk_dst_reset(sk);
589 }
590 break;
591 case IP_TTL:
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700592 if (optlen < 1)
Stephen Hemminger132adf52007-03-08 20:44:43 -0800593 goto e_inval;
Cong Wangc9be4a52013-01-07 21:17:00 +0000594 if (val != -1 && (val < 1 || val > 255))
Stephen Hemminger132adf52007-03-08 20:44:43 -0800595 goto e_inval;
596 inet->uc_ttl = val;
597 break;
598 case IP_HDRINCL:
599 if (sk->sk_type != SOCK_RAW) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600 err = -ENOPROTOOPT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601 break;
Stephen Hemminger132adf52007-03-08 20:44:43 -0800602 }
603 inet->hdrincl = val ? 1 : 0;
604 break;
Jiri Olsa7b2ff182010-06-15 01:07:31 +0000605 case IP_NODEFRAG:
606 if (sk->sk_type != SOCK_RAW) {
607 err = -ENOPROTOOPT;
608 break;
609 }
610 inet->nodefrag = val ? 1 : 0;
611 break;
Stephen Hemminger132adf52007-03-08 20:44:43 -0800612 case IP_MTU_DISCOVER:
John Dykstra0eae7502009-10-19 21:53:53 -0700613 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_PROBE)
Stephen Hemminger132adf52007-03-08 20:44:43 -0800614 goto e_inval;
615 inet->pmtudisc = val;
616 break;
617 case IP_RECVERR:
618 inet->recverr = !!val;
619 if (!val)
620 skb_queue_purge(&sk->sk_error_queue);
621 break;
622 case IP_MULTICAST_TTL:
623 if (sk->sk_type == SOCK_STREAM)
624 goto e_inval;
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700625 if (optlen < 1)
Stephen Hemminger132adf52007-03-08 20:44:43 -0800626 goto e_inval;
Jianjun Kong09cb1052008-11-03 00:27:11 -0800627 if (val == -1)
Stephen Hemminger132adf52007-03-08 20:44:43 -0800628 val = 1;
629 if (val < 0 || val > 255)
630 goto e_inval;
631 inet->mc_ttl = val;
632 break;
633 case IP_MULTICAST_LOOP:
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700634 if (optlen < 1)
Stephen Hemminger132adf52007-03-08 20:44:43 -0800635 goto e_inval;
636 inet->mc_loop = !!val;
637 break;
Erich E. Hoover76e21052012-02-08 09:11:07 +0000638 case IP_UNICAST_IF:
639 {
640 struct net_device *dev = NULL;
641 int ifindex;
642
643 if (optlen != sizeof(int))
644 goto e_inval;
645
646 ifindex = (__force int)ntohl((__force __be32)val);
647 if (ifindex == 0) {
648 inet->uc_index = 0;
649 err = 0;
650 break;
651 }
652
653 dev = dev_get_by_index(sock_net(sk), ifindex);
654 err = -EADDRNOTAVAIL;
655 if (!dev)
656 break;
657 dev_put(dev);
658
659 err = -EINVAL;
660 if (sk->sk_bound_dev_if)
661 break;
662
663 inet->uc_index = ifindex;
664 err = 0;
665 break;
666 }
Stephen Hemminger132adf52007-03-08 20:44:43 -0800667 case IP_MULTICAST_IF:
668 {
669 struct ip_mreqn mreq;
670 struct net_device *dev = NULL;
671
672 if (sk->sk_type == SOCK_STREAM)
673 goto e_inval;
674 /*
675 * Check the arguments are allowable
676 */
677
Shan Wei09159212009-09-22 15:41:10 +0000678 if (optlen < sizeof(struct in_addr))
679 goto e_inval;
680
Stephen Hemminger132adf52007-03-08 20:44:43 -0800681 err = -EFAULT;
682 if (optlen >= sizeof(struct ip_mreqn)) {
Jianjun Kong09cb1052008-11-03 00:27:11 -0800683 if (copy_from_user(&mreq, optval, sizeof(mreq)))
Stephen Hemminger132adf52007-03-08 20:44:43 -0800684 break;
685 } else {
686 memset(&mreq, 0, sizeof(mreq));
Jiri Pirko3a084dd2012-05-03 22:37:45 +0000687 if (optlen >= sizeof(struct ip_mreq)) {
688 if (copy_from_user(&mreq, optval,
689 sizeof(struct ip_mreq)))
690 break;
691 } else if (optlen >= sizeof(struct in_addr)) {
692 if (copy_from_user(&mreq.imr_address, optval,
693 sizeof(struct in_addr)))
694 break;
695 }
Stephen Hemminger132adf52007-03-08 20:44:43 -0800696 }
697
698 if (!mreq.imr_ifindex) {
Al Viroe6f1ceb2008-03-17 22:44:53 -0700699 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
Stephen Hemminger132adf52007-03-08 20:44:43 -0800700 inet->mc_index = 0;
701 inet->mc_addr = 0;
702 err = 0;
703 break;
704 }
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900705 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
Eric Dumazet55b80502009-10-19 06:41:58 +0000706 if (dev)
Stephen Hemminger132adf52007-03-08 20:44:43 -0800707 mreq.imr_ifindex = dev->ifindex;
Stephen Hemminger132adf52007-03-08 20:44:43 -0800708 } else
Eric Dumazet55b80502009-10-19 06:41:58 +0000709 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
Stephen Hemminger132adf52007-03-08 20:44:43 -0800710
711
712 err = -EADDRNOTAVAIL;
713 if (!dev)
714 break;
Eric Dumazet55b80502009-10-19 06:41:58 +0000715 dev_put(dev);
Stephen Hemminger132adf52007-03-08 20:44:43 -0800716
717 err = -EINVAL;
718 if (sk->sk_bound_dev_if &&
719 mreq.imr_ifindex != sk->sk_bound_dev_if)
720 break;
721
722 inet->mc_index = mreq.imr_ifindex;
723 inet->mc_addr = mreq.imr_address.s_addr;
724 err = 0;
725 break;
726 }
727
728 case IP_ADD_MEMBERSHIP:
729 case IP_DROP_MEMBERSHIP:
730 {
731 struct ip_mreqn mreq;
732
Flavio Leitnera96fb492007-08-24 22:16:39 -0700733 err = -EPROTO;
734 if (inet_sk(sk)->is_icsk)
735 break;
736
Stephen Hemminger132adf52007-03-08 20:44:43 -0800737 if (optlen < sizeof(struct ip_mreq))
738 goto e_inval;
739 err = -EFAULT;
740 if (optlen >= sizeof(struct ip_mreqn)) {
Jianjun Kong09cb1052008-11-03 00:27:11 -0800741 if (copy_from_user(&mreq, optval, sizeof(mreq)))
Stephen Hemminger132adf52007-03-08 20:44:43 -0800742 break;
743 } else {
744 memset(&mreq, 0, sizeof(mreq));
Jianjun Kong09cb1052008-11-03 00:27:11 -0800745 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq)))
Stephen Hemminger132adf52007-03-08 20:44:43 -0800746 break;
747 }
748
749 if (optname == IP_ADD_MEMBERSHIP)
750 err = ip_mc_join_group(sk, &mreq);
751 else
752 err = ip_mc_leave_group(sk, &mreq);
753 break;
754 }
755 case IP_MSFILTER:
756 {
Stephen Hemminger132adf52007-03-08 20:44:43 -0800757 struct ip_msfilter *msf;
758
759 if (optlen < IP_MSFILTER_SIZE(0))
760 goto e_inval;
761 if (optlen > sysctl_optmem_max) {
762 err = -ENOBUFS;
763 break;
764 }
765 msf = kmalloc(optlen, GFP_KERNEL);
Stephen Hemmingercfcabdc2007-10-09 01:59:42 -0700766 if (!msf) {
Stephen Hemminger132adf52007-03-08 20:44:43 -0800767 err = -ENOBUFS;
768 break;
769 }
770 err = -EFAULT;
771 if (copy_from_user(msf, optval, optlen)) {
772 kfree(msf);
773 break;
774 }
775 /* numsrc >= (1G-4) overflow in 32 bits */
776 if (msf->imsf_numsrc >= 0x3ffffffcU ||
777 msf->imsf_numsrc > sysctl_igmp_max_msf) {
778 kfree(msf);
779 err = -ENOBUFS;
780 break;
781 }
782 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
783 kfree(msf);
784 err = -EINVAL;
785 break;
786 }
787 err = ip_mc_msfilter(sk, msf, 0);
788 kfree(msf);
789 break;
790 }
791 case IP_BLOCK_SOURCE:
792 case IP_UNBLOCK_SOURCE:
793 case IP_ADD_SOURCE_MEMBERSHIP:
794 case IP_DROP_SOURCE_MEMBERSHIP:
795 {
796 struct ip_mreq_source mreqs;
797 int omode, add;
798
799 if (optlen != sizeof(struct ip_mreq_source))
800 goto e_inval;
801 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
802 err = -EFAULT;
803 break;
804 }
805 if (optname == IP_BLOCK_SOURCE) {
806 omode = MCAST_EXCLUDE;
807 add = 1;
808 } else if (optname == IP_UNBLOCK_SOURCE) {
809 omode = MCAST_EXCLUDE;
810 add = 0;
811 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
812 struct ip_mreqn mreq;
813
814 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
815 mreq.imr_address.s_addr = mreqs.imr_interface;
816 mreq.imr_ifindex = 0;
817 err = ip_mc_join_group(sk, &mreq);
818 if (err && err != -EADDRINUSE)
819 break;
820 omode = MCAST_INCLUDE;
821 add = 1;
822 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
823 omode = MCAST_INCLUDE;
824 add = 0;
825 }
826 err = ip_mc_source(add, omode, sk, &mreqs, 0);
827 break;
828 }
829 case MCAST_JOIN_GROUP:
830 case MCAST_LEAVE_GROUP:
831 {
832 struct group_req greq;
833 struct sockaddr_in *psin;
834 struct ip_mreqn mreq;
835
836 if (optlen < sizeof(struct group_req))
837 goto e_inval;
838 err = -EFAULT;
839 if (copy_from_user(&greq, optval, sizeof(greq)))
840 break;
841 psin = (struct sockaddr_in *)&greq.gr_group;
842 if (psin->sin_family != AF_INET)
843 goto e_inval;
844 memset(&mreq, 0, sizeof(mreq));
845 mreq.imr_multiaddr = psin->sin_addr;
846 mreq.imr_ifindex = greq.gr_interface;
847
848 if (optname == MCAST_JOIN_GROUP)
849 err = ip_mc_join_group(sk, &mreq);
850 else
851 err = ip_mc_leave_group(sk, &mreq);
852 break;
853 }
854 case MCAST_JOIN_SOURCE_GROUP:
855 case MCAST_LEAVE_SOURCE_GROUP:
856 case MCAST_BLOCK_SOURCE:
857 case MCAST_UNBLOCK_SOURCE:
858 {
859 struct group_source_req greqs;
860 struct ip_mreq_source mreqs;
861 struct sockaddr_in *psin;
862 int omode, add;
863
864 if (optlen != sizeof(struct group_source_req))
865 goto e_inval;
866 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
867 err = -EFAULT;
868 break;
869 }
870 if (greqs.gsr_group.ss_family != AF_INET ||
871 greqs.gsr_source.ss_family != AF_INET) {
872 err = -EADDRNOTAVAIL;
873 break;
874 }
875 psin = (struct sockaddr_in *)&greqs.gsr_group;
876 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
877 psin = (struct sockaddr_in *)&greqs.gsr_source;
878 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
879 mreqs.imr_interface = 0; /* use index for mc_source */
880
881 if (optname == MCAST_BLOCK_SOURCE) {
882 omode = MCAST_EXCLUDE;
883 add = 1;
884 } else if (optname == MCAST_UNBLOCK_SOURCE) {
885 omode = MCAST_EXCLUDE;
886 add = 0;
887 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
888 struct ip_mreqn mreq;
889
890 psin = (struct sockaddr_in *)&greqs.gsr_group;
891 mreq.imr_multiaddr = psin->sin_addr;
892 mreq.imr_address.s_addr = 0;
893 mreq.imr_ifindex = greqs.gsr_interface;
894 err = ip_mc_join_group(sk, &mreq);
895 if (err && err != -EADDRINUSE)
896 break;
897 greqs.gsr_interface = mreq.imr_ifindex;
898 omode = MCAST_INCLUDE;
899 add = 1;
900 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
901 omode = MCAST_INCLUDE;
902 add = 0;
903 }
904 err = ip_mc_source(add, omode, sk, &mreqs,
905 greqs.gsr_interface);
906 break;
907 }
908 case MCAST_MSFILTER:
909 {
Stephen Hemminger132adf52007-03-08 20:44:43 -0800910 struct sockaddr_in *psin;
911 struct ip_msfilter *msf = NULL;
912 struct group_filter *gsf = NULL;
913 int msize, i, ifindex;
914
915 if (optlen < GROUP_FILTER_SIZE(0))
916 goto e_inval;
917 if (optlen > sysctl_optmem_max) {
918 err = -ENOBUFS;
919 break;
920 }
Jianjun Kong09cb1052008-11-03 00:27:11 -0800921 gsf = kmalloc(optlen, GFP_KERNEL);
Stephen Hemmingercfcabdc2007-10-09 01:59:42 -0700922 if (!gsf) {
Stephen Hemminger132adf52007-03-08 20:44:43 -0800923 err = -ENOBUFS;
924 break;
925 }
926 err = -EFAULT;
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700927 if (copy_from_user(gsf, optval, optlen))
Stephen Hemminger132adf52007-03-08 20:44:43 -0800928 goto mc_msf_out;
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700929
Stephen Hemminger132adf52007-03-08 20:44:43 -0800930 /* numsrc >= (4G-140)/128 overflow in 32 bits */
931 if (gsf->gf_numsrc >= 0x1ffffff ||
932 gsf->gf_numsrc > sysctl_igmp_max_msf) {
933 err = -ENOBUFS;
934 goto mc_msf_out;
935 }
936 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
937 err = -EINVAL;
938 goto mc_msf_out;
939 }
940 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
Jianjun Kong09cb1052008-11-03 00:27:11 -0800941 msf = kmalloc(msize, GFP_KERNEL);
Stephen Hemmingercfcabdc2007-10-09 01:59:42 -0700942 if (!msf) {
Stephen Hemminger132adf52007-03-08 20:44:43 -0800943 err = -ENOBUFS;
944 goto mc_msf_out;
945 }
946 ifindex = gsf->gf_interface;
947 psin = (struct sockaddr_in *)&gsf->gf_group;
948 if (psin->sin_family != AF_INET) {
949 err = -EADDRNOTAVAIL;
950 goto mc_msf_out;
951 }
952 msf->imsf_multiaddr = psin->sin_addr.s_addr;
953 msf->imsf_interface = 0;
954 msf->imsf_fmode = gsf->gf_fmode;
955 msf->imsf_numsrc = gsf->gf_numsrc;
956 err = -EADDRNOTAVAIL;
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700957 for (i = 0; i < gsf->gf_numsrc; ++i) {
Stephen Hemminger132adf52007-03-08 20:44:43 -0800958 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
959
960 if (psin->sin_family != AF_INET)
961 goto mc_msf_out;
962 msf->imsf_slist[i] = psin->sin_addr.s_addr;
963 }
964 kfree(gsf);
965 gsf = NULL;
966
967 err = ip_mc_msfilter(sk, msf, ifindex);
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700968mc_msf_out:
Stephen Hemminger132adf52007-03-08 20:44:43 -0800969 kfree(msf);
970 kfree(gsf);
971 break;
972 }
Nivedita Singhvif771bef2009-05-28 07:00:46 +0000973 case IP_MULTICAST_ALL:
974 if (optlen < 1)
975 goto e_inval;
976 if (val != 0 && val != 1)
977 goto e_inval;
978 inet->mc_all = val;
979 break;
Stephen Hemminger132adf52007-03-08 20:44:43 -0800980 case IP_ROUTER_ALERT:
981 err = ip_ra_control(sk, val ? 1 : 0, NULL);
982 break;
983
984 case IP_FREEBIND:
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700985 if (optlen < 1)
Stephen Hemminger132adf52007-03-08 20:44:43 -0800986 goto e_inval;
987 inet->freebind = !!val;
988 break;
989
990 case IP_IPSEC_POLICY:
991 case IP_XFRM_POLICY:
992 err = -EPERM;
Eric W. Biederman52e804c2012-11-16 03:03:05 +0000993 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
Stephen Hemminger132adf52007-03-08 20:44:43 -0800994 break;
995 err = xfrm_user_policy(sk, optname, optval, optlen);
996 break;
997
KOVACS Krisztianf5715ae2008-10-01 07:30:02 -0700998 case IP_TRANSPARENT:
Eric W. Biederman52e804c2012-11-16 03:03:05 +0000999 if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) &&
1000 !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
KOVACS Krisztianf5715ae2008-10-01 07:30:02 -07001001 err = -EPERM;
1002 break;
1003 }
1004 if (optlen < 1)
1005 goto e_inval;
1006 inet->transparent = !!val;
1007 break;
1008
Stephen Hemmingerd218d112010-01-11 16:28:01 -08001009 case IP_MINTTL:
1010 if (optlen < 1)
1011 goto e_inval;
1012 if (val < 0 || val > 255)
1013 goto e_inval;
1014 inet->min_ttl = val;
1015 break;
1016
Stephen Hemminger132adf52007-03-08 20:44:43 -08001017 default:
1018 err = -ENOPROTOOPT;
1019 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020 }
1021 release_sock(sk);
1022 return err;
1023
1024e_inval:
1025 release_sock(sk);
1026 return -EINVAL;
1027}
1028
Eric Dumazetf84af322010-04-28 15:31:51 -07001029/**
Eric Dumazetd826eb12011-11-09 07:24:35 +00001030 * ipv4_pktinfo_prepare - transfert some info from rtable to skb
Eric Dumazetf84af322010-04-28 15:31:51 -07001031 * @sk: socket
1032 * @skb: buffer
1033 *
David S. Miller35ebf652012-06-28 03:59:11 -07001034 * To support IP_CMSG_PKTINFO option, we store rt_iif and specific
1035 * destination in skb->cb[] before dst drop.
Eric Dumazetd826eb12011-11-09 07:24:35 +00001036 * This way, receiver doesnt make cache line misses to read rtable.
Eric Dumazetf84af322010-04-28 15:31:51 -07001037 */
Eric Dumazetd826eb12011-11-09 07:24:35 +00001038void ipv4_pktinfo_prepare(struct sk_buff *skb)
Eric Dumazetf84af322010-04-28 15:31:51 -07001039{
Eric Dumazetd826eb12011-11-09 07:24:35 +00001040 struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb);
Eric Dumazetd826eb12011-11-09 07:24:35 +00001041
David S. Miller92101b32012-07-23 16:29:00 -07001042 if (skb_rtable(skb)) {
1043 pktinfo->ipi_ifindex = inet_iif(skb);
David S. Miller35ebf652012-06-28 03:59:11 -07001044 pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb);
Eric Dumazetd826eb12011-11-09 07:24:35 +00001045 } else {
1046 pktinfo->ipi_ifindex = 0;
1047 pktinfo->ipi_spec_dst.s_addr = 0;
1048 }
1049 skb_dst_drop(skb);
Eric Dumazetf84af322010-04-28 15:31:51 -07001050}
Eric Dumazetf84af322010-04-28 15:31:51 -07001051
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001052int ip_setsockopt(struct sock *sk, int level,
David S. Millerb7058842009-09-30 16:12:20 -07001053 int optname, char __user *optval, unsigned int optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001054{
1055 int err;
1056
1057 if (level != SOL_IP)
1058 return -ENOPROTOOPT;
1059
1060 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1061#ifdef CONFIG_NETFILTER
1062 /* we need to exclude all possible ENOPROTOOPTs except default case */
1063 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
Pavel Emelyanov6a9fb942007-11-05 21:32:31 -08001064 optname != IP_IPSEC_POLICY &&
1065 optname != IP_XFRM_POLICY &&
1066 !ip_mroute_opt(optname)) {
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001067 lock_sock(sk);
1068 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
1069 release_sock(sk);
1070 }
1071#endif
1072 return err;
1073}
Eric Dumazet4d52cfb2009-06-02 00:42:16 -07001074EXPORT_SYMBOL(ip_setsockopt);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001075
1076#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001077int compat_ip_setsockopt(struct sock *sk, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -07001078 char __user *optval, unsigned int optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001079{
1080 int err;
1081
1082 if (level != SOL_IP)
1083 return -ENOPROTOOPT;
1084
David L Stevensdae50292008-04-27 01:06:07 -07001085 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
1086 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
1087 ip_setsockopt);
1088
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001089 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1090#ifdef CONFIG_NETFILTER
1091 /* we need to exclude all possible ENOPROTOOPTs except default case */
1092 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
Pavel Emelyanov6a9fb942007-11-05 21:32:31 -08001093 optname != IP_IPSEC_POLICY &&
1094 optname != IP_XFRM_POLICY &&
1095 !ip_mroute_opt(optname)) {
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001096 lock_sock(sk);
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001097 err = compat_nf_setsockopt(sk, PF_INET, optname,
1098 optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001099 release_sock(sk);
1100 }
1101#endif
1102 return err;
1103}
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001104EXPORT_SYMBOL(compat_ip_setsockopt);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001105#endif
1106
Linus Torvalds1da177e2005-04-16 15:20:36 -07001107/*
Eric Dumazet4d52cfb2009-06-02 00:42:16 -07001108 * Get the options. Note for future reference. The GET of IP options gets
1109 * the _received_ ones. The set sets the _sent_ ones.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110 */
1111
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001112static int do_ip_getsockopt(struct sock *sk, int level, int optname,
Eric Dumazet95c96172012-04-15 05:58:06 +00001113 char __user *optval, int __user *optlen, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114{
1115 struct inet_sock *inet = inet_sk(sk);
1116 int val;
1117 int len;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001118
Stephen Hemminger132adf52007-03-08 20:44:43 -08001119 if (level != SOL_IP)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001120 return -EOPNOTSUPP;
1121
Pavel Emelyanov6a9fb942007-11-05 21:32:31 -08001122 if (ip_mroute_opt(optname))
Jianjun Kong09cb1052008-11-03 00:27:11 -08001123 return ip_mroute_getsockopt(sk, optname, optval, optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001124
Jianjun Kong09cb1052008-11-03 00:27:11 -08001125 if (get_user(len, optlen))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126 return -EFAULT;
Stephen Hemminger132adf52007-03-08 20:44:43 -08001127 if (len < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001128 return -EINVAL;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001129
Linus Torvalds1da177e2005-04-16 15:20:36 -07001130 lock_sock(sk);
1131
Stephen Hemminger132adf52007-03-08 20:44:43 -08001132 switch (optname) {
1133 case IP_OPTIONS:
1134 {
1135 unsigned char optbuf[sizeof(struct ip_options)+40];
Eric Dumazetf6d8bd02011-04-21 09:45:37 +00001136 struct ip_options *opt = (struct ip_options *)optbuf;
1137 struct ip_options_rcu *inet_opt;
1138
1139 inet_opt = rcu_dereference_protected(inet->inet_opt,
1140 sock_owned_by_user(sk));
Stephen Hemminger132adf52007-03-08 20:44:43 -08001141 opt->optlen = 0;
Eric Dumazetf6d8bd02011-04-21 09:45:37 +00001142 if (inet_opt)
1143 memcpy(optbuf, &inet_opt->opt,
1144 sizeof(struct ip_options) +
1145 inet_opt->opt.optlen);
Stephen Hemminger132adf52007-03-08 20:44:43 -08001146 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001147
Stephen Hemminger132adf52007-03-08 20:44:43 -08001148 if (opt->optlen == 0)
1149 return put_user(0, optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001150
Stephen Hemminger132adf52007-03-08 20:44:43 -08001151 ip_options_undo(opt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152
Stephen Hemminger132adf52007-03-08 20:44:43 -08001153 len = min_t(unsigned int, len, opt->optlen);
1154 if (put_user(len, optlen))
1155 return -EFAULT;
1156 if (copy_to_user(optval, opt->__data, len))
1157 return -EFAULT;
1158 return 0;
1159 }
1160 case IP_PKTINFO:
1161 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
1162 break;
1163 case IP_RECVTTL:
1164 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1165 break;
1166 case IP_RECVTOS:
1167 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1168 break;
1169 case IP_RECVOPTS:
1170 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1171 break;
1172 case IP_RETOPTS:
1173 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1174 break;
1175 case IP_PASSSEC:
1176 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1177 break;
Balazs Scheidlere8b2dfe2008-11-16 19:32:39 -08001178 case IP_RECVORIGDSTADDR:
1179 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0;
1180 break;
Stephen Hemminger132adf52007-03-08 20:44:43 -08001181 case IP_TOS:
1182 val = inet->tos;
1183 break;
1184 case IP_TTL:
1185 val = (inet->uc_ttl == -1 ?
1186 sysctl_ip_default_ttl :
1187 inet->uc_ttl);
1188 break;
1189 case IP_HDRINCL:
1190 val = inet->hdrincl;
1191 break;
Michael Kerriska89b4762010-09-10 20:26:56 +00001192 case IP_NODEFRAG:
1193 val = inet->nodefrag;
1194 break;
Stephen Hemminger132adf52007-03-08 20:44:43 -08001195 case IP_MTU_DISCOVER:
1196 val = inet->pmtudisc;
1197 break;
1198 case IP_MTU:
1199 {
1200 struct dst_entry *dst;
1201 val = 0;
1202 dst = sk_dst_get(sk);
1203 if (dst) {
1204 val = dst_mtu(dst);
1205 dst_release(dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001206 }
Stephen Hemminger132adf52007-03-08 20:44:43 -08001207 if (!val) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001208 release_sock(sk);
Stephen Hemminger132adf52007-03-08 20:44:43 -08001209 return -ENOTCONN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001210 }
Stephen Hemminger132adf52007-03-08 20:44:43 -08001211 break;
1212 }
1213 case IP_RECVERR:
1214 val = inet->recverr;
1215 break;
1216 case IP_MULTICAST_TTL:
1217 val = inet->mc_ttl;
1218 break;
1219 case IP_MULTICAST_LOOP:
1220 val = inet->mc_loop;
1221 break;
Erich E. Hoover76e21052012-02-08 09:11:07 +00001222 case IP_UNICAST_IF:
1223 val = (__force int)htonl((__u32) inet->uc_index);
1224 break;
Stephen Hemminger132adf52007-03-08 20:44:43 -08001225 case IP_MULTICAST_IF:
1226 {
1227 struct in_addr addr;
1228 len = min_t(unsigned int, len, sizeof(struct in_addr));
1229 addr.s_addr = inet->mc_addr;
1230 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001231
Stephen Hemminger132adf52007-03-08 20:44:43 -08001232 if (put_user(len, optlen))
1233 return -EFAULT;
1234 if (copy_to_user(optval, &addr, len))
1235 return -EFAULT;
1236 return 0;
1237 }
1238 case IP_MSFILTER:
1239 {
1240 struct ip_msfilter msf;
1241 int err;
1242
1243 if (len < IP_MSFILTER_SIZE(0)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001244 release_sock(sk);
Stephen Hemminger132adf52007-03-08 20:44:43 -08001245 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001246 }
Stephen Hemminger132adf52007-03-08 20:44:43 -08001247 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001248 release_sock(sk);
Stephen Hemminger132adf52007-03-08 20:44:43 -08001249 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001250 }
Stephen Hemminger132adf52007-03-08 20:44:43 -08001251 err = ip_mc_msfget(sk, &msf,
1252 (struct ip_msfilter __user *)optval, optlen);
1253 release_sock(sk);
1254 return err;
1255 }
1256 case MCAST_MSFILTER:
1257 {
1258 struct group_filter gsf;
1259 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001260
Stephen Hemminger132adf52007-03-08 20:44:43 -08001261 if (len < GROUP_FILTER_SIZE(0)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001262 release_sock(sk);
Stephen Hemminger132adf52007-03-08 20:44:43 -08001263 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001264 }
Stephen Hemminger132adf52007-03-08 20:44:43 -08001265 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001266 release_sock(sk);
Stephen Hemminger132adf52007-03-08 20:44:43 -08001267 return -EFAULT;
1268 }
1269 err = ip_mc_gsfget(sk, &gsf,
Eric Dumazet4d52cfb2009-06-02 00:42:16 -07001270 (struct group_filter __user *)optval,
1271 optlen);
Stephen Hemminger132adf52007-03-08 20:44:43 -08001272 release_sock(sk);
1273 return err;
1274 }
Nivedita Singhvif771bef2009-05-28 07:00:46 +00001275 case IP_MULTICAST_ALL:
1276 val = inet->mc_all;
1277 break;
Stephen Hemminger132adf52007-03-08 20:44:43 -08001278 case IP_PKTOPTIONS:
1279 {
1280 struct msghdr msg;
1281
1282 release_sock(sk);
1283
1284 if (sk->sk_type != SOCK_STREAM)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001285 return -ENOPROTOOPT;
Stephen Hemminger132adf52007-03-08 20:44:43 -08001286
1287 msg.msg_control = optval;
1288 msg.msg_controllen = len;
Daniel Balutadd23198e2011-08-07 22:31:07 -07001289 msg.msg_flags = flags;
Stephen Hemminger132adf52007-03-08 20:44:43 -08001290
1291 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1292 struct in_pktinfo info;
1293
Eric Dumazetc720c7e2009-10-15 06:30:45 +00001294 info.ipi_addr.s_addr = inet->inet_rcv_saddr;
1295 info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr;
Stephen Hemminger132adf52007-03-08 20:44:43 -08001296 info.ipi_ifindex = inet->mc_index;
1297 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1298 }
1299 if (inet->cmsg_flags & IP_CMSG_TTL) {
1300 int hlim = inet->mc_ttl;
1301 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1302 }
Jiri Benc4c507d22012-02-09 09:35:49 +00001303 if (inet->cmsg_flags & IP_CMSG_TOS) {
1304 int tos = inet->rcv_tos;
1305 put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos);
1306 }
Stephen Hemminger132adf52007-03-08 20:44:43 -08001307 len -= msg.msg_controllen;
1308 return put_user(len, optlen);
1309 }
1310 case IP_FREEBIND:
1311 val = inet->freebind;
1312 break;
KOVACS Krisztianf5715ae2008-10-01 07:30:02 -07001313 case IP_TRANSPARENT:
1314 val = inet->transparent;
1315 break;
Stephen Hemmingerd218d112010-01-11 16:28:01 -08001316 case IP_MINTTL:
1317 val = inet->min_ttl;
1318 break;
Stephen Hemminger132adf52007-03-08 20:44:43 -08001319 default:
1320 release_sock(sk);
1321 return -ENOPROTOOPT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001322 }
1323 release_sock(sk);
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001324
Eric Dumazet4d52cfb2009-06-02 00:42:16 -07001325 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001326 unsigned char ucval = (unsigned char)val;
1327 len = 1;
Stephen Hemminger132adf52007-03-08 20:44:43 -08001328 if (put_user(len, optlen))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001329 return -EFAULT;
Jianjun Kong09cb1052008-11-03 00:27:11 -08001330 if (copy_to_user(optval, &ucval, 1))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001331 return -EFAULT;
1332 } else {
1333 len = min_t(unsigned int, sizeof(int), len);
Stephen Hemminger132adf52007-03-08 20:44:43 -08001334 if (put_user(len, optlen))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001335 return -EFAULT;
Jianjun Kong09cb1052008-11-03 00:27:11 -08001336 if (copy_to_user(optval, &val, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001337 return -EFAULT;
1338 }
1339 return 0;
1340}
1341
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001342int ip_getsockopt(struct sock *sk, int level,
Stephen Hemminger132adf52007-03-08 20:44:43 -08001343 int optname, char __user *optval, int __user *optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001344{
1345 int err;
1346
Daniel Balutadd23198e2011-08-07 22:31:07 -07001347 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001348#ifdef CONFIG_NETFILTER
1349 /* we need to exclude all possible ENOPROTOOPTs except default case */
Pavel Emelyanov6a9fb942007-11-05 21:32:31 -08001350 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1351 !ip_mroute_opt(optname)) {
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001352 int len;
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001353
Jianjun Kong09cb1052008-11-03 00:27:11 -08001354 if (get_user(len, optlen))
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001355 return -EFAULT;
1356
1357 lock_sock(sk);
1358 err = nf_getsockopt(sk, PF_INET, optname, optval,
1359 &len);
1360 release_sock(sk);
1361 if (err >= 0)
1362 err = put_user(len, optlen);
1363 return err;
1364 }
1365#endif
1366 return err;
1367}
Eric Dumazet4d52cfb2009-06-02 00:42:16 -07001368EXPORT_SYMBOL(ip_getsockopt);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001369
1370#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001371int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1372 char __user *optval, int __user *optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001373{
David L Stevens42908c62008-04-29 03:23:22 -07001374 int err;
1375
1376 if (optname == MCAST_MSFILTER)
1377 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1378 ip_getsockopt);
1379
Daniel Balutadd23198e2011-08-07 22:31:07 -07001380 err = do_ip_getsockopt(sk, level, optname, optval, optlen,
1381 MSG_CMSG_COMPAT);
David L Stevens42908c62008-04-29 03:23:22 -07001382
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001383#ifdef CONFIG_NETFILTER
1384 /* we need to exclude all possible ENOPROTOOPTs except default case */
Pavel Emelyanov6a9fb942007-11-05 21:32:31 -08001385 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1386 !ip_mroute_opt(optname)) {
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001387 int len;
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001388
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001389 if (get_user(len, optlen))
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001390 return -EFAULT;
1391
1392 lock_sock(sk);
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001393 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001394 release_sock(sk);
1395 if (err >= 0)
1396 err = put_user(len, optlen);
1397 return err;
1398 }
1399#endif
1400 return err;
1401}
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001402EXPORT_SYMBOL(compat_ip_getsockopt);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001403#endif