blob: 64741b9386329ba6a76b00ea660d78983d2efb8a [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 */
59
60static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
61{
Eric Dumazetd826eb12011-11-09 07:24:35 +000062 struct in_pktinfo info = *PKTINFO_SKB_CB(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070063
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -070064 info.ipi_addr.s_addr = ip_hdr(skb)->daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -070065
66 put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
67}
68
69static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
70{
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -070071 int ttl = ip_hdr(skb)->ttl;
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
73}
74
75static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
76{
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -070077 put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos);
Linus Torvalds1da177e2005-04-16 15:20:36 -070078}
79
80static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
81{
82 if (IPCB(skb)->opt.optlen == 0)
83 return;
84
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -070085 put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen,
86 ip_hdr(skb) + 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -070087}
88
89
90static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb)
91{
92 unsigned char optbuf[sizeof(struct ip_options) + 40];
Daniel Baluta5e73ea12012-04-15 01:34:41 +000093 struct ip_options *opt = (struct ip_options *)optbuf;
Linus Torvalds1da177e2005-04-16 15:20:36 -070094
95 if (IPCB(skb)->opt.optlen == 0)
96 return;
97
98 if (ip_options_echo(opt, skb)) {
99 msg->msg_flags |= MSG_CTRUNC;
100 return;
101 }
102 ip_options_undo(opt);
103
104 put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data);
105}
106
Catherine Zhang2c7946a2006-03-20 22:41:23 -0800107static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
108{
109 char *secdata;
Catherine Zhangdc49c1f2006-08-02 14:12:06 -0700110 u32 seclen, secid;
Catherine Zhang2c7946a2006-03-20 22:41:23 -0800111 int err;
112
Catherine Zhangdc49c1f2006-08-02 14:12:06 -0700113 err = security_socket_getpeersec_dgram(NULL, skb, &secid);
114 if (err)
115 return;
116
117 err = security_secid_to_secctx(secid, &secdata, &seclen);
Catherine Zhang2c7946a2006-03-20 22:41:23 -0800118 if (err)
119 return;
120
121 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
Catherine Zhangdc49c1f2006-08-02 14:12:06 -0700122 security_release_secctx(secdata, seclen);
Catherine Zhang2c7946a2006-03-20 22:41:23 -0800123}
124
Harvey Harrison21d1a162008-11-20 01:54:27 -0800125static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
Balazs Scheidlere8b2dfe2008-11-16 19:32:39 -0800126{
127 struct sockaddr_in sin;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000128 const struct iphdr *iph = ip_hdr(skb);
Harvey Harrison21d1a162008-11-20 01:54:27 -0800129 __be16 *ports = (__be16 *)skb_transport_header(skb);
Balazs Scheidlere8b2dfe2008-11-16 19:32:39 -0800130
131 if (skb_transport_offset(skb) + 4 > skb->len)
132 return;
133
134 /* All current transport protocols have the port numbers in the
135 * first four bytes of the transport header and this function is
136 * written with this assumption in mind.
137 */
138
139 sin.sin_family = AF_INET;
140 sin.sin_addr.s_addr = iph->daddr;
141 sin.sin_port = ports[1];
142 memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
143
144 put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin);
145}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146
147void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
148{
149 struct inet_sock *inet = inet_sk(skb->sk);
Eric Dumazet95c96172012-04-15 05:58:06 +0000150 unsigned int flags = inet->cmsg_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151
152 /* Ordered by supposed usage frequency */
153 if (flags & 1)
154 ip_cmsg_recv_pktinfo(msg, skb);
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700155 if ((flags >>= 1) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 return;
157
158 if (flags & 1)
159 ip_cmsg_recv_ttl(msg, skb);
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700160 if ((flags >>= 1) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 return;
162
163 if (flags & 1)
164 ip_cmsg_recv_tos(msg, skb);
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700165 if ((flags >>= 1) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 return;
167
168 if (flags & 1)
169 ip_cmsg_recv_opts(msg, skb);
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700170 if ((flags >>= 1) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 return;
172
173 if (flags & 1)
174 ip_cmsg_recv_retopts(msg, skb);
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700175 if ((flags >>= 1) == 0)
Catherine Zhang2c7946a2006-03-20 22:41:23 -0800176 return;
177
178 if (flags & 1)
179 ip_cmsg_recv_security(msg, skb);
Balazs Scheidlere8b2dfe2008-11-16 19:32:39 -0800180
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700181 if ((flags >>= 1) == 0)
Balazs Scheidlere8b2dfe2008-11-16 19:32:39 -0800182 return;
183 if (flags & 1)
184 ip_cmsg_recv_dstaddr(msg, skb);
185
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186}
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700187EXPORT_SYMBOL(ip_cmsg_recv);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188
Hannes Frederic Sowac8e6ad02014-02-18 21:38:08 +0100189int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc,
190 bool allow_ipv6)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191{
Francesco Fuscof02db312013-09-24 15:43:08 +0200192 int err, val;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 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;
Hannes Frederic Sowac8e6ad02014-02-18 21:38:08 +0100198#if defined(CONFIG_IPV6)
199 if (allow_ipv6 &&
200 cmsg->cmsg_level == SOL_IPV6 &&
201 cmsg->cmsg_type == IPV6_PKTINFO) {
202 struct in6_pktinfo *src_info;
203
204 if (cmsg->cmsg_len < CMSG_LEN(sizeof(*src_info)))
205 return -EINVAL;
206 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
207 if (!ipv6_addr_v4mapped(&src_info->ipi6_addr))
208 return -EINVAL;
209 ipc->oif = src_info->ipi6_ifindex;
210 ipc->addr = src_info->ipi6_addr.s6_addr32[3];
211 continue;
212 }
213#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 if (cmsg->cmsg_level != SOL_IP)
215 continue;
216 switch (cmsg->cmsg_type) {
217 case IP_RETOPTS:
218 err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700219 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg),
220 err < 40 ? err : 40);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 if (err)
222 return err;
223 break;
224 case IP_PKTINFO:
225 {
226 struct in_pktinfo *info;
227 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
228 return -EINVAL;
229 info = (struct in_pktinfo *)CMSG_DATA(cmsg);
230 ipc->oif = info->ipi_ifindex;
231 ipc->addr = info->ipi_spec_dst.s_addr;
232 break;
233 }
Francesco Fuscof02db312013-09-24 15:43:08 +0200234 case IP_TTL:
235 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
236 return -EINVAL;
237 val = *(int *)CMSG_DATA(cmsg);
238 if (val < 1 || val > 255)
239 return -EINVAL;
240 ipc->ttl = val;
241 break;
242 case IP_TOS:
243 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
244 return -EINVAL;
245 val = *(int *)CMSG_DATA(cmsg);
246 if (val < 0 || val > 255)
247 return -EINVAL;
248 ipc->tos = val;
249 ipc->priority = rt_tos2priority(ipc->tos);
250 break;
251
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 default:
253 return -EINVAL;
254 }
255 }
256 return 0;
257}
258
259
260/* Special input handler for packets caught by router alert option.
261 They are selected only by protocol field, and then processed likely
262 local ones; but only if someone wants them! Otherwise, router
263 not running rsvpd will kill RSVP.
264
265 It is user level problem, what it will make with them.
266 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
267 but receiver should be enough clever f.e. to forward mtrace requests,
268 sent to multicast group to reach destination designated router.
269 */
Eric Dumazet43a951e2010-10-25 03:32:44 +0000270struct ip_ra_chain __rcu *ip_ra_chain;
Eric Dumazet66018502010-06-07 03:12:08 +0000271static DEFINE_SPINLOCK(ip_ra_lock);
272
Eric Dumazet592fcb92010-06-09 16:21:07 +0000273
274static void ip_ra_destroy_rcu(struct rcu_head *head)
Eric Dumazet66018502010-06-07 03:12:08 +0000275{
Eric Dumazet592fcb92010-06-09 16:21:07 +0000276 struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu);
277
278 sock_put(ra->saved_sk);
279 kfree(ra);
Eric Dumazet66018502010-06-07 03:12:08 +0000280}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700282int ip_ra_control(struct sock *sk, unsigned char on,
283 void (*destructor)(struct sock *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284{
Eric Dumazet43a951e2010-10-25 03:32:44 +0000285 struct ip_ra_chain *ra, *new_ra;
286 struct ip_ra_chain __rcu **rap;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000288 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 return -EINVAL;
290
291 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
292
Eric Dumazet66018502010-06-07 03:12:08 +0000293 spin_lock_bh(&ip_ra_lock);
Eric Dumazet43a951e2010-10-25 03:32:44 +0000294 for (rap = &ip_ra_chain;
295 (ra = rcu_dereference_protected(*rap,
296 lockdep_is_held(&ip_ra_lock))) != NULL;
297 rap = &ra->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 if (ra->sk == sk) {
299 if (on) {
Eric Dumazet66018502010-06-07 03:12:08 +0000300 spin_unlock_bh(&ip_ra_lock);
Jesper Juhla51482b2005-11-08 09:41:34 -0800301 kfree(new_ra);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 return -EADDRINUSE;
303 }
Eric Dumazet592fcb92010-06-09 16:21:07 +0000304 /* dont let ip_call_ra_chain() use sk again */
305 ra->sk = NULL;
Eric Dumazet66018502010-06-07 03:12:08 +0000306 rcu_assign_pointer(*rap, ra->next);
307 spin_unlock_bh(&ip_ra_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308
309 if (ra->destructor)
310 ra->destructor(sk);
Eric Dumazet592fcb92010-06-09 16:21:07 +0000311 /*
312 * Delay sock_put(sk) and kfree(ra) after one rcu grace
313 * period. This guarantee ip_call_ra_chain() dont need
314 * to mess with socket refcounts.
315 */
316 ra->saved_sk = sk;
317 call_rcu(&ra->rcu, ip_ra_destroy_rcu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 return 0;
319 }
320 }
321 if (new_ra == NULL) {
Eric Dumazet66018502010-06-07 03:12:08 +0000322 spin_unlock_bh(&ip_ra_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 return -ENOBUFS;
324 }
325 new_ra->sk = sk;
326 new_ra->destructor = destructor;
327
328 new_ra->next = ra;
Eric Dumazet66018502010-06-07 03:12:08 +0000329 rcu_assign_pointer(*rap, new_ra);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 sock_hold(sk);
Eric Dumazet66018502010-06-07 03:12:08 +0000331 spin_unlock_bh(&ip_ra_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332
333 return 0;
334}
335
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900336void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
Al Viro35986b32006-09-27 18:34:21 -0700337 __be16 port, u32 info, u8 *payload)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 struct sock_exterr_skb *serr;
340
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 skb = skb_clone(skb, GFP_ATOMIC);
342 if (!skb)
343 return;
344
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900345 serr = SKB_EXT_ERR(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 serr->ee.ee_errno = err;
347 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
Arnaldo Carvalho de Melo88c76642007-03-13 14:43:18 -0300348 serr->ee.ee_type = icmp_hdr(skb)->type;
349 serr->ee.ee_code = icmp_hdr(skb)->code;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 serr->ee.ee_pad = 0;
351 serr->ee.ee_info = info;
352 serr->ee.ee_data = 0;
Arnaldo Carvalho de Melo88c76642007-03-13 14:43:18 -0300353 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700354 skb_network_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 serr->port = port;
356
Arnaldo Carvalho de Melobd823932007-03-13 17:10:43 -0300357 if (skb_pull(skb, payload - skb->data) != NULL) {
358 skb_reset_transport_header(skb);
359 if (sock_queue_err_skb(sk, skb) == 0)
360 return;
361 }
362 kfree_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363}
364
Al Viro05790162006-09-27 18:33:40 -0700365void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366{
367 struct inet_sock *inet = inet_sk(sk);
368 struct sock_exterr_skb *serr;
369 struct iphdr *iph;
370 struct sk_buff *skb;
371
372 if (!inet->recverr)
373 return;
374
375 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
376 if (!skb)
377 return;
378
Arnaldo Carvalho de Melo2ca9e6f2007-03-10 19:15:25 -0300379 skb_put(skb, sizeof(struct iphdr));
380 skb_reset_network_header(skb);
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700381 iph = ip_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 iph->daddr = daddr;
383
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900384 serr = SKB_EXT_ERR(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 serr->ee.ee_errno = err;
386 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900387 serr->ee.ee_type = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 serr->ee.ee_code = 0;
389 serr->ee.ee_pad = 0;
390 serr->ee.ee_info = info;
391 serr->ee.ee_data = 0;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700392 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 serr->port = port;
394
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700395 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
Arnaldo Carvalho de Melobd823932007-03-13 17:10:43 -0300396 skb_reset_transport_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397
398 if (sock_queue_err_skb(sk, skb))
399 kfree_skb(skb);
400}
401
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900402/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403 * Handle MSG_ERRQUEUE
404 */
Hannes Frederic Sowa85fbaa72013-11-23 00:46:12 +0100405int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406{
407 struct sock_exterr_skb *serr;
408 struct sk_buff *skb, *skb2;
Steffen Hurrle342dfc32014-01-17 22:53:15 +0100409 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 struct {
411 struct sock_extended_err ee;
412 struct sockaddr_in offender;
413 } errhdr;
414 int err;
415 int copied;
416
417 err = -EAGAIN;
418 skb = skb_dequeue(&sk->sk_error_queue);
419 if (skb == NULL)
420 goto out;
421
422 copied = skb->len;
423 if (copied > len) {
424 msg->msg_flags |= MSG_TRUNC;
425 copied = len;
426 }
427 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
428 if (err)
429 goto out_free_skb;
430
431 sock_recv_timestamp(msg, sk, skb);
432
433 serr = SKB_EXT_ERR(skb);
434
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 if (sin) {
436 sin->sin_family = AF_INET;
Arnaldo Carvalho de Melod56f90a2007-04-10 20:50:43 -0700437 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
438 serr->addr_offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 sin->sin_port = serr->port;
440 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
Hannes Frederic Sowa85fbaa72013-11-23 00:46:12 +0100441 *addr_len = sizeof(*sin);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442 }
443
444 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
445 sin = &errhdr.offender;
446 sin->sin_family = AF_UNSPEC;
447 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
448 struct inet_sock *inet = inet_sk(sk);
449
450 sin->sin_family = AF_INET;
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700451 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 sin->sin_port = 0;
453 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
454 if (inet->cmsg_flags)
455 ip_cmsg_recv(msg, skb);
456 }
457
458 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
459
460 /* Now we could try to dump offended packet options */
461
462 msg->msg_flags |= MSG_ERRQUEUE;
463 err = copied;
464
465 /* Reset and regenerate socket error */
Herbert Xue0f9f852005-06-18 22:56:18 -0700466 spin_lock_bh(&sk->sk_error_queue.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467 sk->sk_err = 0;
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700468 skb2 = skb_peek(&sk->sk_error_queue);
469 if (skb2 != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
Herbert Xue0f9f852005-06-18 22:56:18 -0700471 spin_unlock_bh(&sk->sk_error_queue.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472 sk->sk_error_report(sk);
473 } else
Herbert Xue0f9f852005-06-18 22:56:18 -0700474 spin_unlock_bh(&sk->sk_error_queue.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900476out_free_skb:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 kfree_skb(skb);
478out:
479 return err;
480}
481
482
483/*
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700484 * Socket option code for IP. This is the end of the line after any
485 * TCP,UDP etc options on an IP socket.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486 */
487
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800488static int do_ip_setsockopt(struct sock *sk, int level,
David S. Millerb7058842009-09-30 16:12:20 -0700489 int optname, char __user *optval, unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490{
491 struct inet_sock *inet = inet_sk(sk);
Jianjun Kong09cb1052008-11-03 00:27:11 -0800492 int val = 0, err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493
Xi Wang0c9f79b2012-11-11 11:20:01 +0000494 switch (optname) {
495 case IP_PKTINFO:
496 case IP_RECVTTL:
497 case IP_RECVOPTS:
498 case IP_RECVTOS:
499 case IP_RETOPTS:
500 case IP_TOS:
501 case IP_TTL:
502 case IP_HDRINCL:
503 case IP_MTU_DISCOVER:
504 case IP_RECVERR:
505 case IP_ROUTER_ALERT:
506 case IP_FREEBIND:
507 case IP_PASSSEC:
508 case IP_TRANSPARENT:
509 case IP_MINTTL:
510 case IP_NODEFRAG:
511 case IP_UNICAST_IF:
512 case IP_MULTICAST_TTL:
513 case IP_MULTICAST_ALL:
514 case IP_MULTICAST_LOOP:
515 case IP_RECVORIGDSTADDR:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 if (optlen >= sizeof(int)) {
517 if (get_user(val, (int __user *) optval))
518 return -EFAULT;
519 } else if (optlen >= sizeof(char)) {
520 unsigned char ucval;
521
522 if (get_user(ucval, (unsigned char __user *) optval))
523 return -EFAULT;
524 val = (int) ucval;
525 }
526 }
527
528 /* If optlen==0, it is equivalent to val == 0 */
529
Pavel Emelyanov6a9fb942007-11-05 21:32:31 -0800530 if (ip_mroute_opt(optname))
Jianjun Kong09cb1052008-11-03 00:27:11 -0800531 return ip_mroute_setsockopt(sk, optname, optval, optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532
533 err = 0;
534 lock_sock(sk);
535
536 switch (optname) {
Stephen Hemminger132adf52007-03-08 20:44:43 -0800537 case IP_OPTIONS:
538 {
Eric Dumazetf6d8bd02011-04-21 09:45:37 +0000539 struct ip_options_rcu *old, *opt = NULL;
540
roel kluin65a1c4f2009-10-23 05:59:21 +0000541 if (optlen > 40)
Stephen Hemminger132adf52007-03-08 20:44:43 -0800542 goto e_inval;
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900543 err = ip_options_get_from_user(sock_net(sk), &opt,
Denis V. Lunevcb846632008-03-24 15:31:00 -0700544 optval, optlen);
Stephen Hemminger132adf52007-03-08 20:44:43 -0800545 if (err)
546 break;
Eric Dumazetf6d8bd02011-04-21 09:45:37 +0000547 old = rcu_dereference_protected(inet->inet_opt,
548 sock_owned_by_user(sk));
Stephen Hemminger132adf52007-03-08 20:44:43 -0800549 if (inet->is_icsk) {
550 struct inet_connection_sock *icsk = inet_csk(sk);
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000551#if IS_ENABLED(CONFIG_IPV6)
Stephen Hemminger132adf52007-03-08 20:44:43 -0800552 if (sk->sk_family == PF_INET ||
553 (!((1 << sk->sk_state) &
554 (TCPF_LISTEN | TCPF_CLOSE)) &&
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000555 inet->inet_daddr != LOOPBACK4_IPV6)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556#endif
Eric Dumazetf6d8bd02011-04-21 09:45:37 +0000557 if (old)
558 icsk->icsk_ext_hdr_len -= old->opt.optlen;
Stephen Hemminger132adf52007-03-08 20:44:43 -0800559 if (opt)
Eric Dumazetf6d8bd02011-04-21 09:45:37 +0000560 icsk->icsk_ext_hdr_len += opt->opt.optlen;
Stephen Hemminger132adf52007-03-08 20:44:43 -0800561 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000562#if IS_ENABLED(CONFIG_IPV6)
Stephen Hemminger132adf52007-03-08 20:44:43 -0800563 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 }
Eric Dumazetf6d8bd02011-04-21 09:45:37 +0000566 rcu_assign_pointer(inet->inet_opt, opt);
567 if (old)
Paul E. McKenney605b4af2012-01-06 17:08:33 -0800568 kfree_rcu(old, rcu);
Stephen Hemminger132adf52007-03-08 20:44:43 -0800569 break;
570 }
571 case IP_PKTINFO:
572 if (val)
573 inet->cmsg_flags |= IP_CMSG_PKTINFO;
574 else
575 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
576 break;
577 case IP_RECVTTL:
578 if (val)
579 inet->cmsg_flags |= IP_CMSG_TTL;
580 else
581 inet->cmsg_flags &= ~IP_CMSG_TTL;
582 break;
583 case IP_RECVTOS:
584 if (val)
585 inet->cmsg_flags |= IP_CMSG_TOS;
586 else
587 inet->cmsg_flags &= ~IP_CMSG_TOS;
588 break;
589 case IP_RECVOPTS:
590 if (val)
591 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
592 else
593 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
594 break;
595 case IP_RETOPTS:
596 if (val)
597 inet->cmsg_flags |= IP_CMSG_RETOPTS;
598 else
599 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
600 break;
601 case IP_PASSSEC:
602 if (val)
603 inet->cmsg_flags |= IP_CMSG_PASSSEC;
604 else
605 inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
606 break;
Balazs Scheidlere8b2dfe2008-11-16 19:32:39 -0800607 case IP_RECVORIGDSTADDR:
608 if (val)
609 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR;
610 else
611 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR;
612 break;
Stephen Hemminger132adf52007-03-08 20:44:43 -0800613 case IP_TOS: /* This sets both TOS and Precedence */
614 if (sk->sk_type == SOCK_STREAM) {
Maciej Żenczykowski2c67e9a2011-10-22 00:07:47 -0400615 val &= ~INET_ECN_MASK;
616 val |= inet->tos & INET_ECN_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617 }
Stephen Hemminger132adf52007-03-08 20:44:43 -0800618 if (inet->tos != val) {
619 inet->tos = val;
620 sk->sk_priority = rt_tos2priority(val);
621 sk_dst_reset(sk);
622 }
623 break;
624 case IP_TTL:
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700625 if (optlen < 1)
Stephen Hemminger132adf52007-03-08 20:44:43 -0800626 goto e_inval;
Cong Wangc9be4a52013-01-07 21:17:00 +0000627 if (val != -1 && (val < 1 || val > 255))
Stephen Hemminger132adf52007-03-08 20:44:43 -0800628 goto e_inval;
629 inet->uc_ttl = val;
630 break;
631 case IP_HDRINCL:
632 if (sk->sk_type != SOCK_RAW) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633 err = -ENOPROTOOPT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634 break;
Stephen Hemminger132adf52007-03-08 20:44:43 -0800635 }
636 inet->hdrincl = val ? 1 : 0;
637 break;
Jiri Olsa7b2ff182010-06-15 01:07:31 +0000638 case IP_NODEFRAG:
639 if (sk->sk_type != SOCK_RAW) {
640 err = -ENOPROTOOPT;
641 break;
642 }
643 inet->nodefrag = val ? 1 : 0;
644 break;
Stephen Hemminger132adf52007-03-08 20:44:43 -0800645 case IP_MTU_DISCOVER:
Hannes Frederic Sowa1b346572014-02-26 01:20:42 +0100646 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT)
Stephen Hemminger132adf52007-03-08 20:44:43 -0800647 goto e_inval;
648 inet->pmtudisc = val;
649 break;
650 case IP_RECVERR:
651 inet->recverr = !!val;
652 if (!val)
653 skb_queue_purge(&sk->sk_error_queue);
654 break;
655 case IP_MULTICAST_TTL:
656 if (sk->sk_type == SOCK_STREAM)
657 goto e_inval;
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700658 if (optlen < 1)
Stephen Hemminger132adf52007-03-08 20:44:43 -0800659 goto e_inval;
Jianjun Kong09cb1052008-11-03 00:27:11 -0800660 if (val == -1)
Stephen Hemminger132adf52007-03-08 20:44:43 -0800661 val = 1;
662 if (val < 0 || val > 255)
663 goto e_inval;
664 inet->mc_ttl = val;
665 break;
666 case IP_MULTICAST_LOOP:
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700667 if (optlen < 1)
Stephen Hemminger132adf52007-03-08 20:44:43 -0800668 goto e_inval;
669 inet->mc_loop = !!val;
670 break;
Erich E. Hoover76e21052012-02-08 09:11:07 +0000671 case IP_UNICAST_IF:
672 {
673 struct net_device *dev = NULL;
674 int ifindex;
675
676 if (optlen != sizeof(int))
677 goto e_inval;
678
679 ifindex = (__force int)ntohl((__force __be32)val);
680 if (ifindex == 0) {
681 inet->uc_index = 0;
682 err = 0;
683 break;
684 }
685
686 dev = dev_get_by_index(sock_net(sk), ifindex);
687 err = -EADDRNOTAVAIL;
688 if (!dev)
689 break;
690 dev_put(dev);
691
692 err = -EINVAL;
693 if (sk->sk_bound_dev_if)
694 break;
695
696 inet->uc_index = ifindex;
697 err = 0;
698 break;
699 }
Stephen Hemminger132adf52007-03-08 20:44:43 -0800700 case IP_MULTICAST_IF:
701 {
702 struct ip_mreqn mreq;
703 struct net_device *dev = NULL;
704
705 if (sk->sk_type == SOCK_STREAM)
706 goto e_inval;
707 /*
708 * Check the arguments are allowable
709 */
710
Shan Wei09159212009-09-22 15:41:10 +0000711 if (optlen < sizeof(struct in_addr))
712 goto e_inval;
713
Stephen Hemminger132adf52007-03-08 20:44:43 -0800714 err = -EFAULT;
715 if (optlen >= sizeof(struct ip_mreqn)) {
Jianjun Kong09cb1052008-11-03 00:27:11 -0800716 if (copy_from_user(&mreq, optval, sizeof(mreq)))
Stephen Hemminger132adf52007-03-08 20:44:43 -0800717 break;
718 } else {
719 memset(&mreq, 0, sizeof(mreq));
Jiri Pirko3a084dd2012-05-03 22:37:45 +0000720 if (optlen >= sizeof(struct ip_mreq)) {
721 if (copy_from_user(&mreq, optval,
722 sizeof(struct ip_mreq)))
723 break;
724 } else if (optlen >= sizeof(struct in_addr)) {
725 if (copy_from_user(&mreq.imr_address, optval,
726 sizeof(struct in_addr)))
727 break;
728 }
Stephen Hemminger132adf52007-03-08 20:44:43 -0800729 }
730
731 if (!mreq.imr_ifindex) {
Al Viroe6f1ceb2008-03-17 22:44:53 -0700732 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
Stephen Hemminger132adf52007-03-08 20:44:43 -0800733 inet->mc_index = 0;
734 inet->mc_addr = 0;
735 err = 0;
736 break;
737 }
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900738 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
Eric Dumazet55b80502009-10-19 06:41:58 +0000739 if (dev)
Stephen Hemminger132adf52007-03-08 20:44:43 -0800740 mreq.imr_ifindex = dev->ifindex;
Stephen Hemminger132adf52007-03-08 20:44:43 -0800741 } else
Eric Dumazet55b80502009-10-19 06:41:58 +0000742 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
Stephen Hemminger132adf52007-03-08 20:44:43 -0800743
744
745 err = -EADDRNOTAVAIL;
746 if (!dev)
747 break;
Eric Dumazet55b80502009-10-19 06:41:58 +0000748 dev_put(dev);
Stephen Hemminger132adf52007-03-08 20:44:43 -0800749
750 err = -EINVAL;
751 if (sk->sk_bound_dev_if &&
752 mreq.imr_ifindex != sk->sk_bound_dev_if)
753 break;
754
755 inet->mc_index = mreq.imr_ifindex;
756 inet->mc_addr = mreq.imr_address.s_addr;
757 err = 0;
758 break;
759 }
760
761 case IP_ADD_MEMBERSHIP:
762 case IP_DROP_MEMBERSHIP:
763 {
764 struct ip_mreqn mreq;
765
Flavio Leitnera96fb492007-08-24 22:16:39 -0700766 err = -EPROTO;
767 if (inet_sk(sk)->is_icsk)
768 break;
769
Stephen Hemminger132adf52007-03-08 20:44:43 -0800770 if (optlen < sizeof(struct ip_mreq))
771 goto e_inval;
772 err = -EFAULT;
773 if (optlen >= sizeof(struct ip_mreqn)) {
Jianjun Kong09cb1052008-11-03 00:27:11 -0800774 if (copy_from_user(&mreq, optval, sizeof(mreq)))
Stephen Hemminger132adf52007-03-08 20:44:43 -0800775 break;
776 } else {
777 memset(&mreq, 0, sizeof(mreq));
Jianjun Kong09cb1052008-11-03 00:27:11 -0800778 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq)))
Stephen Hemminger132adf52007-03-08 20:44:43 -0800779 break;
780 }
781
782 if (optname == IP_ADD_MEMBERSHIP)
783 err = ip_mc_join_group(sk, &mreq);
784 else
785 err = ip_mc_leave_group(sk, &mreq);
786 break;
787 }
788 case IP_MSFILTER:
789 {
Stephen Hemminger132adf52007-03-08 20:44:43 -0800790 struct ip_msfilter *msf;
791
792 if (optlen < IP_MSFILTER_SIZE(0))
793 goto e_inval;
794 if (optlen > sysctl_optmem_max) {
795 err = -ENOBUFS;
796 break;
797 }
798 msf = kmalloc(optlen, GFP_KERNEL);
Stephen Hemmingercfcabdc2007-10-09 01:59:42 -0700799 if (!msf) {
Stephen Hemminger132adf52007-03-08 20:44:43 -0800800 err = -ENOBUFS;
801 break;
802 }
803 err = -EFAULT;
804 if (copy_from_user(msf, optval, optlen)) {
805 kfree(msf);
806 break;
807 }
808 /* numsrc >= (1G-4) overflow in 32 bits */
809 if (msf->imsf_numsrc >= 0x3ffffffcU ||
810 msf->imsf_numsrc > sysctl_igmp_max_msf) {
811 kfree(msf);
812 err = -ENOBUFS;
813 break;
814 }
815 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
816 kfree(msf);
817 err = -EINVAL;
818 break;
819 }
820 err = ip_mc_msfilter(sk, msf, 0);
821 kfree(msf);
822 break;
823 }
824 case IP_BLOCK_SOURCE:
825 case IP_UNBLOCK_SOURCE:
826 case IP_ADD_SOURCE_MEMBERSHIP:
827 case IP_DROP_SOURCE_MEMBERSHIP:
828 {
829 struct ip_mreq_source mreqs;
830 int omode, add;
831
832 if (optlen != sizeof(struct ip_mreq_source))
833 goto e_inval;
834 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
835 err = -EFAULT;
836 break;
837 }
838 if (optname == IP_BLOCK_SOURCE) {
839 omode = MCAST_EXCLUDE;
840 add = 1;
841 } else if (optname == IP_UNBLOCK_SOURCE) {
842 omode = MCAST_EXCLUDE;
843 add = 0;
844 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
845 struct ip_mreqn mreq;
846
847 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
848 mreq.imr_address.s_addr = mreqs.imr_interface;
849 mreq.imr_ifindex = 0;
850 err = ip_mc_join_group(sk, &mreq);
851 if (err && err != -EADDRINUSE)
852 break;
853 omode = MCAST_INCLUDE;
854 add = 1;
855 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
856 omode = MCAST_INCLUDE;
857 add = 0;
858 }
859 err = ip_mc_source(add, omode, sk, &mreqs, 0);
860 break;
861 }
862 case MCAST_JOIN_GROUP:
863 case MCAST_LEAVE_GROUP:
864 {
865 struct group_req greq;
866 struct sockaddr_in *psin;
867 struct ip_mreqn mreq;
868
869 if (optlen < sizeof(struct group_req))
870 goto e_inval;
871 err = -EFAULT;
872 if (copy_from_user(&greq, optval, sizeof(greq)))
873 break;
874 psin = (struct sockaddr_in *)&greq.gr_group;
875 if (psin->sin_family != AF_INET)
876 goto e_inval;
877 memset(&mreq, 0, sizeof(mreq));
878 mreq.imr_multiaddr = psin->sin_addr;
879 mreq.imr_ifindex = greq.gr_interface;
880
881 if (optname == MCAST_JOIN_GROUP)
882 err = ip_mc_join_group(sk, &mreq);
883 else
884 err = ip_mc_leave_group(sk, &mreq);
885 break;
886 }
887 case MCAST_JOIN_SOURCE_GROUP:
888 case MCAST_LEAVE_SOURCE_GROUP:
889 case MCAST_BLOCK_SOURCE:
890 case MCAST_UNBLOCK_SOURCE:
891 {
892 struct group_source_req greqs;
893 struct ip_mreq_source mreqs;
894 struct sockaddr_in *psin;
895 int omode, add;
896
897 if (optlen != sizeof(struct group_source_req))
898 goto e_inval;
899 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
900 err = -EFAULT;
901 break;
902 }
903 if (greqs.gsr_group.ss_family != AF_INET ||
904 greqs.gsr_source.ss_family != AF_INET) {
905 err = -EADDRNOTAVAIL;
906 break;
907 }
908 psin = (struct sockaddr_in *)&greqs.gsr_group;
909 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
910 psin = (struct sockaddr_in *)&greqs.gsr_source;
911 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
912 mreqs.imr_interface = 0; /* use index for mc_source */
913
914 if (optname == MCAST_BLOCK_SOURCE) {
915 omode = MCAST_EXCLUDE;
916 add = 1;
917 } else if (optname == MCAST_UNBLOCK_SOURCE) {
918 omode = MCAST_EXCLUDE;
919 add = 0;
920 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
921 struct ip_mreqn mreq;
922
923 psin = (struct sockaddr_in *)&greqs.gsr_group;
924 mreq.imr_multiaddr = psin->sin_addr;
925 mreq.imr_address.s_addr = 0;
926 mreq.imr_ifindex = greqs.gsr_interface;
927 err = ip_mc_join_group(sk, &mreq);
928 if (err && err != -EADDRINUSE)
929 break;
930 greqs.gsr_interface = mreq.imr_ifindex;
931 omode = MCAST_INCLUDE;
932 add = 1;
933 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
934 omode = MCAST_INCLUDE;
935 add = 0;
936 }
937 err = ip_mc_source(add, omode, sk, &mreqs,
938 greqs.gsr_interface);
939 break;
940 }
941 case MCAST_MSFILTER:
942 {
Stephen Hemminger132adf52007-03-08 20:44:43 -0800943 struct sockaddr_in *psin;
944 struct ip_msfilter *msf = NULL;
945 struct group_filter *gsf = NULL;
946 int msize, i, ifindex;
947
948 if (optlen < GROUP_FILTER_SIZE(0))
949 goto e_inval;
950 if (optlen > sysctl_optmem_max) {
951 err = -ENOBUFS;
952 break;
953 }
Jianjun Kong09cb1052008-11-03 00:27:11 -0800954 gsf = kmalloc(optlen, GFP_KERNEL);
Stephen Hemmingercfcabdc2007-10-09 01:59:42 -0700955 if (!gsf) {
Stephen Hemminger132adf52007-03-08 20:44:43 -0800956 err = -ENOBUFS;
957 break;
958 }
959 err = -EFAULT;
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700960 if (copy_from_user(gsf, optval, optlen))
Stephen Hemminger132adf52007-03-08 20:44:43 -0800961 goto mc_msf_out;
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700962
Stephen Hemminger132adf52007-03-08 20:44:43 -0800963 /* numsrc >= (4G-140)/128 overflow in 32 bits */
964 if (gsf->gf_numsrc >= 0x1ffffff ||
965 gsf->gf_numsrc > sysctl_igmp_max_msf) {
966 err = -ENOBUFS;
967 goto mc_msf_out;
968 }
969 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
970 err = -EINVAL;
971 goto mc_msf_out;
972 }
973 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
Jianjun Kong09cb1052008-11-03 00:27:11 -0800974 msf = kmalloc(msize, GFP_KERNEL);
Stephen Hemmingercfcabdc2007-10-09 01:59:42 -0700975 if (!msf) {
Stephen Hemminger132adf52007-03-08 20:44:43 -0800976 err = -ENOBUFS;
977 goto mc_msf_out;
978 }
979 ifindex = gsf->gf_interface;
980 psin = (struct sockaddr_in *)&gsf->gf_group;
981 if (psin->sin_family != AF_INET) {
982 err = -EADDRNOTAVAIL;
983 goto mc_msf_out;
984 }
985 msf->imsf_multiaddr = psin->sin_addr.s_addr;
986 msf->imsf_interface = 0;
987 msf->imsf_fmode = gsf->gf_fmode;
988 msf->imsf_numsrc = gsf->gf_numsrc;
989 err = -EADDRNOTAVAIL;
Eric Dumazet4d52cfb2009-06-02 00:42:16 -0700990 for (i = 0; i < gsf->gf_numsrc; ++i) {
Stephen Hemminger132adf52007-03-08 20:44:43 -0800991 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
992
993 if (psin->sin_family != AF_INET)
994 goto mc_msf_out;
995 msf->imsf_slist[i] = psin->sin_addr.s_addr;
996 }
997 kfree(gsf);
998 gsf = NULL;
999
1000 err = ip_mc_msfilter(sk, msf, ifindex);
Eric Dumazet4d52cfb2009-06-02 00:42:16 -07001001mc_msf_out:
Stephen Hemminger132adf52007-03-08 20:44:43 -08001002 kfree(msf);
1003 kfree(gsf);
1004 break;
1005 }
Nivedita Singhvif771bef2009-05-28 07:00:46 +00001006 case IP_MULTICAST_ALL:
1007 if (optlen < 1)
1008 goto e_inval;
1009 if (val != 0 && val != 1)
1010 goto e_inval;
1011 inet->mc_all = val;
1012 break;
Stephen Hemminger132adf52007-03-08 20:44:43 -08001013 case IP_ROUTER_ALERT:
1014 err = ip_ra_control(sk, val ? 1 : 0, NULL);
1015 break;
1016
1017 case IP_FREEBIND:
Eric Dumazet4d52cfb2009-06-02 00:42:16 -07001018 if (optlen < 1)
Stephen Hemminger132adf52007-03-08 20:44:43 -08001019 goto e_inval;
1020 inet->freebind = !!val;
1021 break;
1022
1023 case IP_IPSEC_POLICY:
1024 case IP_XFRM_POLICY:
1025 err = -EPERM;
Eric W. Biederman52e804c2012-11-16 03:03:05 +00001026 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
Stephen Hemminger132adf52007-03-08 20:44:43 -08001027 break;
1028 err = xfrm_user_policy(sk, optname, optval, optlen);
1029 break;
1030
KOVACS Krisztianf5715ae2008-10-01 07:30:02 -07001031 case IP_TRANSPARENT:
Eric W. Biederman52e804c2012-11-16 03:03:05 +00001032 if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) &&
1033 !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
KOVACS Krisztianf5715ae2008-10-01 07:30:02 -07001034 err = -EPERM;
1035 break;
1036 }
1037 if (optlen < 1)
1038 goto e_inval;
1039 inet->transparent = !!val;
1040 break;
1041
Stephen Hemmingerd218d112010-01-11 16:28:01 -08001042 case IP_MINTTL:
1043 if (optlen < 1)
1044 goto e_inval;
1045 if (val < 0 || val > 255)
1046 goto e_inval;
1047 inet->min_ttl = val;
1048 break;
1049
Stephen Hemminger132adf52007-03-08 20:44:43 -08001050 default:
1051 err = -ENOPROTOOPT;
1052 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053 }
1054 release_sock(sk);
1055 return err;
1056
1057e_inval:
1058 release_sock(sk);
1059 return -EINVAL;
1060}
1061
Eric Dumazetf84af322010-04-28 15:31:51 -07001062/**
Eric Dumazetd826eb12011-11-09 07:24:35 +00001063 * ipv4_pktinfo_prepare - transfert some info from rtable to skb
Eric Dumazetf84af322010-04-28 15:31:51 -07001064 * @sk: socket
1065 * @skb: buffer
1066 *
David S. Miller35ebf652012-06-28 03:59:11 -07001067 * To support IP_CMSG_PKTINFO option, we store rt_iif and specific
1068 * destination in skb->cb[] before dst drop.
stephen hemminger8e3bff92013-12-08 12:15:44 -08001069 * This way, receiver doesn't make cache line misses to read rtable.
Eric Dumazetf84af322010-04-28 15:31:51 -07001070 */
Shawn Bohrerfbf88662013-10-07 11:01:40 -05001071void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb)
Eric Dumazetf84af322010-04-28 15:31:51 -07001072{
Eric Dumazetd826eb12011-11-09 07:24:35 +00001073 struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb);
Hannes Frederic Sowa4b261c72014-01-20 03:43:08 +01001074 bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) ||
1075 ipv6_sk_rxinfo(sk);
Eric Dumazetd826eb12011-11-09 07:24:35 +00001076
Hannes Frederic Sowa4b261c72014-01-20 03:43:08 +01001077 if (prepare && skb_rtable(skb)) {
David S. Miller92101b32012-07-23 16:29:00 -07001078 pktinfo->ipi_ifindex = inet_iif(skb);
David S. Miller35ebf652012-06-28 03:59:11 -07001079 pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb);
Eric Dumazetd826eb12011-11-09 07:24:35 +00001080 } else {
1081 pktinfo->ipi_ifindex = 0;
1082 pktinfo->ipi_spec_dst.s_addr = 0;
1083 }
1084 skb_dst_drop(skb);
Eric Dumazetf84af322010-04-28 15:31:51 -07001085}
Eric Dumazetf84af322010-04-28 15:31:51 -07001086
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001087int ip_setsockopt(struct sock *sk, int level,
David S. Millerb7058842009-09-30 16:12:20 -07001088 int optname, char __user *optval, unsigned int optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001089{
1090 int err;
1091
1092 if (level != SOL_IP)
1093 return -ENOPROTOOPT;
1094
1095 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1096#ifdef CONFIG_NETFILTER
1097 /* we need to exclude all possible ENOPROTOOPTs except default case */
1098 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
Pavel Emelyanov6a9fb942007-11-05 21:32:31 -08001099 optname != IP_IPSEC_POLICY &&
1100 optname != IP_XFRM_POLICY &&
1101 !ip_mroute_opt(optname)) {
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001102 lock_sock(sk);
1103 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
1104 release_sock(sk);
1105 }
1106#endif
1107 return err;
1108}
Eric Dumazet4d52cfb2009-06-02 00:42:16 -07001109EXPORT_SYMBOL(ip_setsockopt);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001110
1111#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001112int compat_ip_setsockopt(struct sock *sk, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -07001113 char __user *optval, unsigned int optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001114{
1115 int err;
1116
1117 if (level != SOL_IP)
1118 return -ENOPROTOOPT;
1119
David L Stevensdae50292008-04-27 01:06:07 -07001120 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
1121 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
1122 ip_setsockopt);
1123
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001124 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1125#ifdef CONFIG_NETFILTER
1126 /* we need to exclude all possible ENOPROTOOPTs except default case */
1127 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
Pavel Emelyanov6a9fb942007-11-05 21:32:31 -08001128 optname != IP_IPSEC_POLICY &&
1129 optname != IP_XFRM_POLICY &&
1130 !ip_mroute_opt(optname)) {
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001131 lock_sock(sk);
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001132 err = compat_nf_setsockopt(sk, PF_INET, optname,
1133 optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001134 release_sock(sk);
1135 }
1136#endif
1137 return err;
1138}
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001139EXPORT_SYMBOL(compat_ip_setsockopt);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001140#endif
1141
Linus Torvalds1da177e2005-04-16 15:20:36 -07001142/*
Eric Dumazet4d52cfb2009-06-02 00:42:16 -07001143 * Get the options. Note for future reference. The GET of IP options gets
1144 * the _received_ ones. The set sets the _sent_ ones.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001145 */
1146
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001147static int do_ip_getsockopt(struct sock *sk, int level, int optname,
Eric Dumazet95c96172012-04-15 05:58:06 +00001148 char __user *optval, int __user *optlen, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149{
1150 struct inet_sock *inet = inet_sk(sk);
1151 int val;
1152 int len;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001153
Stephen Hemminger132adf52007-03-08 20:44:43 -08001154 if (level != SOL_IP)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001155 return -EOPNOTSUPP;
1156
Pavel Emelyanov6a9fb942007-11-05 21:32:31 -08001157 if (ip_mroute_opt(optname))
Jianjun Kong09cb1052008-11-03 00:27:11 -08001158 return ip_mroute_getsockopt(sk, optname, optval, optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001159
Jianjun Kong09cb1052008-11-03 00:27:11 -08001160 if (get_user(len, optlen))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001161 return -EFAULT;
Stephen Hemminger132adf52007-03-08 20:44:43 -08001162 if (len < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001163 return -EINVAL;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001164
Linus Torvalds1da177e2005-04-16 15:20:36 -07001165 lock_sock(sk);
1166
Stephen Hemminger132adf52007-03-08 20:44:43 -08001167 switch (optname) {
1168 case IP_OPTIONS:
1169 {
1170 unsigned char optbuf[sizeof(struct ip_options)+40];
Eric Dumazetf6d8bd02011-04-21 09:45:37 +00001171 struct ip_options *opt = (struct ip_options *)optbuf;
1172 struct ip_options_rcu *inet_opt;
1173
1174 inet_opt = rcu_dereference_protected(inet->inet_opt,
1175 sock_owned_by_user(sk));
Stephen Hemminger132adf52007-03-08 20:44:43 -08001176 opt->optlen = 0;
Eric Dumazetf6d8bd02011-04-21 09:45:37 +00001177 if (inet_opt)
1178 memcpy(optbuf, &inet_opt->opt,
1179 sizeof(struct ip_options) +
1180 inet_opt->opt.optlen);
Stephen Hemminger132adf52007-03-08 20:44:43 -08001181 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001182
Stephen Hemminger132adf52007-03-08 20:44:43 -08001183 if (opt->optlen == 0)
1184 return put_user(0, optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001185
Stephen Hemminger132adf52007-03-08 20:44:43 -08001186 ip_options_undo(opt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001187
Stephen Hemminger132adf52007-03-08 20:44:43 -08001188 len = min_t(unsigned int, len, opt->optlen);
1189 if (put_user(len, optlen))
1190 return -EFAULT;
1191 if (copy_to_user(optval, opt->__data, len))
1192 return -EFAULT;
1193 return 0;
1194 }
1195 case IP_PKTINFO:
1196 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
1197 break;
1198 case IP_RECVTTL:
1199 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1200 break;
1201 case IP_RECVTOS:
1202 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1203 break;
1204 case IP_RECVOPTS:
1205 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1206 break;
1207 case IP_RETOPTS:
1208 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1209 break;
1210 case IP_PASSSEC:
1211 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1212 break;
Balazs Scheidlere8b2dfe2008-11-16 19:32:39 -08001213 case IP_RECVORIGDSTADDR:
1214 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0;
1215 break;
Stephen Hemminger132adf52007-03-08 20:44:43 -08001216 case IP_TOS:
1217 val = inet->tos;
1218 break;
1219 case IP_TTL:
1220 val = (inet->uc_ttl == -1 ?
1221 sysctl_ip_default_ttl :
1222 inet->uc_ttl);
1223 break;
1224 case IP_HDRINCL:
1225 val = inet->hdrincl;
1226 break;
Michael Kerriska89b4762010-09-10 20:26:56 +00001227 case IP_NODEFRAG:
1228 val = inet->nodefrag;
1229 break;
Stephen Hemminger132adf52007-03-08 20:44:43 -08001230 case IP_MTU_DISCOVER:
1231 val = inet->pmtudisc;
1232 break;
1233 case IP_MTU:
1234 {
1235 struct dst_entry *dst;
1236 val = 0;
1237 dst = sk_dst_get(sk);
1238 if (dst) {
1239 val = dst_mtu(dst);
1240 dst_release(dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001241 }
Stephen Hemminger132adf52007-03-08 20:44:43 -08001242 if (!val) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001243 release_sock(sk);
Stephen Hemminger132adf52007-03-08 20:44:43 -08001244 return -ENOTCONN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001245 }
Stephen Hemminger132adf52007-03-08 20:44:43 -08001246 break;
1247 }
1248 case IP_RECVERR:
1249 val = inet->recverr;
1250 break;
1251 case IP_MULTICAST_TTL:
1252 val = inet->mc_ttl;
1253 break;
1254 case IP_MULTICAST_LOOP:
1255 val = inet->mc_loop;
1256 break;
Erich E. Hoover76e21052012-02-08 09:11:07 +00001257 case IP_UNICAST_IF:
1258 val = (__force int)htonl((__u32) inet->uc_index);
1259 break;
Stephen Hemminger132adf52007-03-08 20:44:43 -08001260 case IP_MULTICAST_IF:
1261 {
1262 struct in_addr addr;
1263 len = min_t(unsigned int, len, sizeof(struct in_addr));
1264 addr.s_addr = inet->mc_addr;
1265 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001266
Stephen Hemminger132adf52007-03-08 20:44:43 -08001267 if (put_user(len, optlen))
1268 return -EFAULT;
1269 if (copy_to_user(optval, &addr, len))
1270 return -EFAULT;
1271 return 0;
1272 }
1273 case IP_MSFILTER:
1274 {
1275 struct ip_msfilter msf;
1276 int err;
1277
1278 if (len < IP_MSFILTER_SIZE(0)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001279 release_sock(sk);
Stephen Hemminger132adf52007-03-08 20:44:43 -08001280 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001281 }
Stephen Hemminger132adf52007-03-08 20:44:43 -08001282 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001283 release_sock(sk);
Stephen Hemminger132adf52007-03-08 20:44:43 -08001284 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001285 }
Stephen Hemminger132adf52007-03-08 20:44:43 -08001286 err = ip_mc_msfget(sk, &msf,
1287 (struct ip_msfilter __user *)optval, optlen);
1288 release_sock(sk);
1289 return err;
1290 }
1291 case MCAST_MSFILTER:
1292 {
1293 struct group_filter gsf;
1294 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001295
Stephen Hemminger132adf52007-03-08 20:44:43 -08001296 if (len < GROUP_FILTER_SIZE(0)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001297 release_sock(sk);
Stephen Hemminger132adf52007-03-08 20:44:43 -08001298 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001299 }
Stephen Hemminger132adf52007-03-08 20:44:43 -08001300 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301 release_sock(sk);
Stephen Hemminger132adf52007-03-08 20:44:43 -08001302 return -EFAULT;
1303 }
1304 err = ip_mc_gsfget(sk, &gsf,
Eric Dumazet4d52cfb2009-06-02 00:42:16 -07001305 (struct group_filter __user *)optval,
1306 optlen);
Stephen Hemminger132adf52007-03-08 20:44:43 -08001307 release_sock(sk);
1308 return err;
1309 }
Nivedita Singhvif771bef2009-05-28 07:00:46 +00001310 case IP_MULTICAST_ALL:
1311 val = inet->mc_all;
1312 break;
Stephen Hemminger132adf52007-03-08 20:44:43 -08001313 case IP_PKTOPTIONS:
1314 {
1315 struct msghdr msg;
1316
1317 release_sock(sk);
1318
1319 if (sk->sk_type != SOCK_STREAM)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001320 return -ENOPROTOOPT;
Stephen Hemminger132adf52007-03-08 20:44:43 -08001321
1322 msg.msg_control = optval;
1323 msg.msg_controllen = len;
Daniel Balutadd23198e2011-08-07 22:31:07 -07001324 msg.msg_flags = flags;
Stephen Hemminger132adf52007-03-08 20:44:43 -08001325
1326 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1327 struct in_pktinfo info;
1328
Eric Dumazetc720c7e2009-10-15 06:30:45 +00001329 info.ipi_addr.s_addr = inet->inet_rcv_saddr;
1330 info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr;
Stephen Hemminger132adf52007-03-08 20:44:43 -08001331 info.ipi_ifindex = inet->mc_index;
1332 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1333 }
1334 if (inet->cmsg_flags & IP_CMSG_TTL) {
1335 int hlim = inet->mc_ttl;
1336 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1337 }
Jiri Benc4c507d22012-02-09 09:35:49 +00001338 if (inet->cmsg_flags & IP_CMSG_TOS) {
1339 int tos = inet->rcv_tos;
1340 put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos);
1341 }
Stephen Hemminger132adf52007-03-08 20:44:43 -08001342 len -= msg.msg_controllen;
1343 return put_user(len, optlen);
1344 }
1345 case IP_FREEBIND:
1346 val = inet->freebind;
1347 break;
KOVACS Krisztianf5715ae2008-10-01 07:30:02 -07001348 case IP_TRANSPARENT:
1349 val = inet->transparent;
1350 break;
Stephen Hemmingerd218d112010-01-11 16:28:01 -08001351 case IP_MINTTL:
1352 val = inet->min_ttl;
1353 break;
Stephen Hemminger132adf52007-03-08 20:44:43 -08001354 default:
1355 release_sock(sk);
1356 return -ENOPROTOOPT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001357 }
1358 release_sock(sk);
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001359
Eric Dumazet4d52cfb2009-06-02 00:42:16 -07001360 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001361 unsigned char ucval = (unsigned char)val;
1362 len = 1;
Stephen Hemminger132adf52007-03-08 20:44:43 -08001363 if (put_user(len, optlen))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001364 return -EFAULT;
Jianjun Kong09cb1052008-11-03 00:27:11 -08001365 if (copy_to_user(optval, &ucval, 1))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001366 return -EFAULT;
1367 } else {
1368 len = min_t(unsigned int, sizeof(int), len);
Stephen Hemminger132adf52007-03-08 20:44:43 -08001369 if (put_user(len, optlen))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001370 return -EFAULT;
Jianjun Kong09cb1052008-11-03 00:27:11 -08001371 if (copy_to_user(optval, &val, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001372 return -EFAULT;
1373 }
1374 return 0;
1375}
1376
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001377int ip_getsockopt(struct sock *sk, int level,
Stephen Hemminger132adf52007-03-08 20:44:43 -08001378 int optname, char __user *optval, int __user *optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001379{
1380 int err;
1381
Daniel Balutadd23198e2011-08-07 22:31:07 -07001382 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0);
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
Jianjun Kong09cb1052008-11-03 00:27:11 -08001389 if (get_user(len, optlen))
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001390 return -EFAULT;
1391
1392 lock_sock(sk);
1393 err = nf_getsockopt(sk, PF_INET, optname, optval,
1394 &len);
1395 release_sock(sk);
1396 if (err >= 0)
1397 err = put_user(len, optlen);
1398 return err;
1399 }
1400#endif
1401 return err;
1402}
Eric Dumazet4d52cfb2009-06-02 00:42:16 -07001403EXPORT_SYMBOL(ip_getsockopt);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001404
1405#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001406int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1407 char __user *optval, int __user *optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001408{
David L Stevens42908c62008-04-29 03:23:22 -07001409 int err;
1410
1411 if (optname == MCAST_MSFILTER)
1412 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1413 ip_getsockopt);
1414
Daniel Balutadd23198e2011-08-07 22:31:07 -07001415 err = do_ip_getsockopt(sk, level, optname, optval, optlen,
1416 MSG_CMSG_COMPAT);
David L Stevens42908c62008-04-29 03:23:22 -07001417
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001418#ifdef CONFIG_NETFILTER
1419 /* we need to exclude all possible ENOPROTOOPTs except default case */
Pavel Emelyanov6a9fb942007-11-05 21:32:31 -08001420 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1421 !ip_mroute_opt(optname)) {
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001422 int len;
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001423
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001424 if (get_user(len, optlen))
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001425 return -EFAULT;
1426
1427 lock_sock(sk);
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001428 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001429 release_sock(sk);
1430 if (err >= 0)
1431 err = put_user(len, optlen);
1432 return err;
1433 }
1434#endif
1435 return err;
1436}
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001437EXPORT_SYMBOL(compat_ip_getsockopt);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001438#endif