blob: 8210964a9f19bedf17d6f3266c1fd0775f3de144 [file] [log] [blame]
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001/*
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 * "Ping" sockets
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
12 *
13 * Based on ipv4/udp.c code.
14 *
15 * Authors: Vasiliy Kulikov / Openwall (for Linux 2.6),
16 * Pavel Kankovsky (for Linux 2.4.32)
17 *
18 * Pavel gave all rights to bugs to Vasiliy,
19 * none of the bugs are Pavel's now.
20 *
21 */
22
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +000023#include <linux/uaccess.h>
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +000024#include <linux/types.h>
25#include <linux/fcntl.h>
26#include <linux/socket.h>
27#include <linux/sockios.h>
28#include <linux/in.h>
29#include <linux/errno.h>
30#include <linux/timer.h>
31#include <linux/mm.h>
32#include <linux/inet.h>
33#include <linux/netdevice.h>
34#include <net/snmp.h>
35#include <net/ip.h>
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +000036#include <net/icmp.h>
37#include <net/protocol.h>
38#include <linux/skbuff.h>
39#include <linux/proc_fs.h>
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040040#include <linux/export.h>
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +000041#include <net/sock.h>
42#include <net/ping.h>
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +000043#include <net/udp.h>
44#include <net/route.h>
45#include <net/inet_common.h>
46#include <net/checksum.h>
47
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +000048#if IS_ENABLED(CONFIG_IPV6)
49#include <linux/in6.h>
50#include <linux/icmpv6.h>
51#include <net/addrconf.h>
52#include <net/ipv6.h>
53#include <net/transp_v6.h>
54#endif
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +000055
Stephen Hemmingerea074b32013-12-28 11:11:42 -080056struct ping_table {
57 struct hlist_nulls_head hash[PING_HTABLE_SIZE];
58 rwlock_t lock;
59};
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +000060
Stephen Hemmingerea074b32013-12-28 11:11:42 -080061static struct ping_table ping_table;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +000062struct pingv6_ops pingv6_ops;
63EXPORT_SYMBOL_GPL(pingv6_ops);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +000064
Eric Dumazet1b1cb1f2011-05-13 22:59:19 +000065static u16 ping_port_rover;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +000066
Eric Dumazet95c96172012-04-15 05:58:06 +000067static inline int ping_hashfn(struct net *net, unsigned int num, unsigned int mask)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +000068{
69 int res = (num + net_hash_mix(net)) & mask;
Eric Dumazet95c96172012-04-15 05:58:06 +000070
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +000071 pr_debug("hash(%d) = %d\n", num, res);
72 return res;
73}
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +000074EXPORT_SYMBOL_GPL(ping_hash);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +000075
76static inline struct hlist_nulls_head *ping_hashslot(struct ping_table *table,
Eric Dumazet95c96172012-04-15 05:58:06 +000077 struct net *net, unsigned int num)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +000078{
79 return &table->hash[ping_hashfn(net, num, PING_HTABLE_MASK)];
80}
81
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +000082int ping_get_port(struct sock *sk, unsigned short ident)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +000083{
84 struct hlist_nulls_node *node;
85 struct hlist_nulls_head *hlist;
86 struct inet_sock *isk, *isk2;
87 struct sock *sk2 = NULL;
88
89 isk = inet_sk(sk);
90 write_lock_bh(&ping_table.lock);
91 if (ident == 0) {
92 u32 i;
93 u16 result = ping_port_rover + 1;
94
95 for (i = 0; i < (1L << 16); i++, result++) {
96 if (!result)
97 result++; /* avoid zero */
98 hlist = ping_hashslot(&ping_table, sock_net(sk),
99 result);
100 ping_portaddr_for_each_entry(sk2, node, hlist) {
101 isk2 = inet_sk(sk2);
102
103 if (isk2->inet_num == result)
104 goto next_port;
105 }
106
107 /* found */
108 ping_port_rover = ident = result;
109 break;
110next_port:
111 ;
112 }
113 if (i >= (1L << 16))
114 goto fail;
115 } else {
116 hlist = ping_hashslot(&ping_table, sock_net(sk), ident);
117 ping_portaddr_for_each_entry(sk2, node, hlist) {
118 isk2 = inet_sk(sk2);
119
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000120 /* BUG? Why is this reuse and not reuseaddr? ping.c
121 * doesn't turn off SO_REUSEADDR, and it doesn't expect
122 * that other ping processes can steal its packets.
123 */
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000124 if ((isk2->inet_num == ident) &&
125 (sk2 != sk) &&
126 (!sk2->sk_reuse || !sk->sk_reuse))
127 goto fail;
128 }
129 }
130
131 pr_debug("found port/ident = %d\n", ident);
132 isk->inet_num = ident;
133 if (sk_unhashed(sk)) {
134 pr_debug("was not hashed\n");
135 sock_hold(sk);
136 hlist_nulls_add_head(&sk->sk_nulls_node, hlist);
137 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
138 }
139 write_unlock_bh(&ping_table.lock);
140 return 0;
141
142fail:
143 write_unlock_bh(&ping_table.lock);
144 return 1;
145}
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000146EXPORT_SYMBOL_GPL(ping_get_port);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000147
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000148void ping_hash(struct sock *sk)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000149{
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000150 pr_debug("ping_hash(sk->port=%u)\n", inet_sk(sk)->inet_num);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000151 BUG(); /* "Please do not press this button again." */
152}
153
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000154void ping_unhash(struct sock *sk)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000155{
156 struct inet_sock *isk = inet_sk(sk);
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000157 pr_debug("ping_unhash(isk=%p,isk->num=%u)\n", isk, isk->inet_num);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000158 if (sk_hashed(sk)) {
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000159 write_lock_bh(&ping_table.lock);
160 hlist_nulls_del(&sk->sk_nulls_node);
161 sock_put(sk);
Eric Dumazet747465e2012-01-16 19:27:39 +0000162 isk->inet_num = 0;
163 isk->inet_sport = 0;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000164 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
165 write_unlock_bh(&ping_table.lock);
166 }
167}
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000168EXPORT_SYMBOL_GPL(ping_unhash);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000169
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000170static struct sock *ping_lookup(struct net *net, struct sk_buff *skb, u16 ident)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000171{
172 struct hlist_nulls_head *hslot = ping_hashslot(&ping_table, net, ident);
173 struct sock *sk = NULL;
174 struct inet_sock *isk;
175 struct hlist_nulls_node *hnode;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000176 int dif = skb->dev->ifindex;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000177
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000178 if (skb->protocol == htons(ETH_P_IP)) {
179 pr_debug("try to find: num = %d, daddr = %pI4, dif = %d\n",
180 (int)ident, &ip_hdr(skb)->daddr, dif);
181#if IS_ENABLED(CONFIG_IPV6)
182 } else if (skb->protocol == htons(ETH_P_IPV6)) {
183 pr_debug("try to find: num = %d, daddr = %pI6c, dif = %d\n",
184 (int)ident, &ipv6_hdr(skb)->daddr, dif);
185#endif
186 }
187
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000188 read_lock_bh(&ping_table.lock);
189
190 ping_portaddr_for_each_entry(sk, hnode, hslot) {
191 isk = inet_sk(sk);
192
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000193 pr_debug("iterate\n");
194 if (isk->inet_num != ident)
195 continue;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000196
197 if (skb->protocol == htons(ETH_P_IP) &&
198 sk->sk_family == AF_INET) {
199 pr_debug("found: %p: num=%d, daddr=%pI4, dif=%d\n", sk,
200 (int) isk->inet_num, &isk->inet_rcv_saddr,
201 sk->sk_bound_dev_if);
202
203 if (isk->inet_rcv_saddr &&
204 isk->inet_rcv_saddr != ip_hdr(skb)->daddr)
205 continue;
206#if IS_ENABLED(CONFIG_IPV6)
207 } else if (skb->protocol == htons(ETH_P_IPV6) &&
208 sk->sk_family == AF_INET6) {
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000209
210 pr_debug("found: %p: num=%d, daddr=%pI6c, dif=%d\n", sk,
211 (int) isk->inet_num,
Eric Dumazetefe42082013-10-03 15:42:29 -0700212 &sk->sk_v6_rcv_saddr,
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000213 sk->sk_bound_dev_if);
214
Eric Dumazetefe42082013-10-03 15:42:29 -0700215 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) &&
216 !ipv6_addr_equal(&sk->sk_v6_rcv_saddr,
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000217 &ipv6_hdr(skb)->daddr))
218 continue;
219#endif
220 }
221
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000222 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)
223 continue;
224
225 sock_hold(sk);
226 goto exit;
227 }
228
229 sk = NULL;
230exit:
231 read_unlock_bh(&ping_table.lock);
232
233 return sk;
234}
235
Eric W. Biederman7064d162012-05-24 10:34:21 -0600236static void inet_get_ping_group_range_net(struct net *net, kgid_t *low,
237 kgid_t *high)
Vasiliy Kulikovf56e03e2011-05-17 00:16:56 +0000238{
Eric W. Biederman7064d162012-05-24 10:34:21 -0600239 kgid_t *data = net->ipv4.sysctl_ping_group_range;
Eric Dumazet95c96172012-04-15 05:58:06 +0000240 unsigned int seq;
241
Vasiliy Kulikovf56e03e2011-05-17 00:16:56 +0000242 do {
Eric W. Biederman0bbf87d2013-09-28 14:10:59 -0700243 seq = read_seqbegin(&net->ipv4.sysctl_local_ports.lock);
Vasiliy Kulikovf56e03e2011-05-17 00:16:56 +0000244
245 *low = data[0];
246 *high = data[1];
Eric W. Biederman0bbf87d2013-09-28 14:10:59 -0700247 } while (read_seqretry(&net->ipv4.sysctl_local_ports.lock, seq));
Vasiliy Kulikovf56e03e2011-05-17 00:16:56 +0000248}
249
250
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000251int ping_init_sock(struct sock *sk)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000252{
253 struct net *net = sock_net(sk);
Eric W. Biederman7064d162012-05-24 10:34:21 -0600254 kgid_t group = current_egid();
Wang, Xiaomingb04c4612014-04-14 12:30:45 -0400255 struct group_info *group_info;
256 int i, j, count;
Eric W. Biedermanae2975b2011-11-14 15:56:38 -0800257 kgid_t low, high;
Wang, Xiaomingb04c4612014-04-14 12:30:45 -0400258 int ret = 0;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000259
Eric W. Biederman7064d162012-05-24 10:34:21 -0600260 inet_get_ping_group_range_net(net, &low, &high);
261 if (gid_lte(low, group) && gid_lte(group, high))
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000262 return 0;
263
Wang, Xiaomingb04c4612014-04-14 12:30:45 -0400264 group_info = get_current_groups();
265 count = group_info->ngroups;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000266 for (i = 0; i < group_info->nblocks; i++) {
267 int cp_count = min_t(int, NGROUPS_PER_BLOCK, count);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000268 for (j = 0; j < cp_count; j++) {
Eric W. Biedermanae2975b2011-11-14 15:56:38 -0800269 kgid_t gid = group_info->blocks[i][j];
270 if (gid_lte(low, gid) && gid_lte(gid, high))
Wang, Xiaomingb04c4612014-04-14 12:30:45 -0400271 goto out_release_group;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000272 }
273
274 count -= cp_count;
275 }
276
Wang, Xiaomingb04c4612014-04-14 12:30:45 -0400277 ret = -EACCES;
278
279out_release_group:
280 put_group_info(group_info);
281 return ret;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000282}
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000283EXPORT_SYMBOL_GPL(ping_init_sock);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000284
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000285void ping_close(struct sock *sk, long timeout)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000286{
287 pr_debug("ping_close(sk=%p,sk->num=%u)\n",
Joe Perches058bd4d2012-03-11 18:36:11 +0000288 inet_sk(sk), inet_sk(sk)->inet_num);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000289 pr_debug("isk->refcnt = %d\n", sk->sk_refcnt.counter);
290
291 sk_common_release(sk);
292}
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000293EXPORT_SYMBOL_GPL(ping_close);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000294
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000295/* Checks the bind address and possibly modifies sk->sk_bound_dev_if. */
Wu Fengguanga06a2d32013-06-12 21:04:16 +0800296static int ping_check_bind_addr(struct sock *sk, struct inet_sock *isk,
297 struct sockaddr *uaddr, int addr_len) {
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000298 struct net *net = sock_net(sk);
299 if (sk->sk_family == AF_INET) {
300 struct sockaddr_in *addr = (struct sockaddr_in *) uaddr;
301 int chk_addr_ret;
302
303 if (addr_len < sizeof(*addr))
304 return -EINVAL;
305
306 pr_debug("ping_check_bind_addr(sk=%p,addr=%pI4,port=%d)\n",
307 sk, &addr->sin_addr.s_addr, ntohs(addr->sin_port));
308
309 chk_addr_ret = inet_addr_type(net, addr->sin_addr.s_addr);
310
311 if (addr->sin_addr.s_addr == htonl(INADDR_ANY))
312 chk_addr_ret = RTN_LOCAL;
313
314 if ((sysctl_ip_nonlocal_bind == 0 &&
315 isk->freebind == 0 && isk->transparent == 0 &&
316 chk_addr_ret != RTN_LOCAL) ||
317 chk_addr_ret == RTN_MULTICAST ||
318 chk_addr_ret == RTN_BROADCAST)
319 return -EADDRNOTAVAIL;
320
321#if IS_ENABLED(CONFIG_IPV6)
322 } else if (sk->sk_family == AF_INET6) {
323 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr;
324 int addr_type, scoped, has_addr;
325 struct net_device *dev = NULL;
326
327 if (addr_len < sizeof(*addr))
328 return -EINVAL;
329
Hannes Frederic Sowa82b276c2014-01-20 05:16:39 +0100330 if (addr->sin6_family != AF_INET6)
331 return -EINVAL;
332
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000333 pr_debug("ping_check_bind_addr(sk=%p,addr=%pI6c,port=%d)\n",
334 sk, addr->sin6_addr.s6_addr, ntohs(addr->sin6_port));
335
336 addr_type = ipv6_addr_type(&addr->sin6_addr);
337 scoped = __ipv6_addr_needs_scope_id(addr_type);
338 if ((addr_type != IPV6_ADDR_ANY &&
339 !(addr_type & IPV6_ADDR_UNICAST)) ||
340 (scoped && !addr->sin6_scope_id))
341 return -EINVAL;
342
343 rcu_read_lock();
344 if (addr->sin6_scope_id) {
345 dev = dev_get_by_index_rcu(net, addr->sin6_scope_id);
346 if (!dev) {
347 rcu_read_unlock();
348 return -ENODEV;
349 }
350 }
351 has_addr = pingv6_ops.ipv6_chk_addr(net, &addr->sin6_addr, dev,
352 scoped);
353 rcu_read_unlock();
354
355 if (!(isk->freebind || isk->transparent || has_addr ||
356 addr_type == IPV6_ADDR_ANY))
357 return -EADDRNOTAVAIL;
358
359 if (scoped)
360 sk->sk_bound_dev_if = addr->sin6_scope_id;
361#endif
362 } else {
363 return -EAFNOSUPPORT;
364 }
365 return 0;
366}
367
Wu Fengguanga06a2d32013-06-12 21:04:16 +0800368static void ping_set_saddr(struct sock *sk, struct sockaddr *saddr)
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000369{
370 if (saddr->sa_family == AF_INET) {
371 struct inet_sock *isk = inet_sk(sk);
372 struct sockaddr_in *addr = (struct sockaddr_in *) saddr;
373 isk->inet_rcv_saddr = isk->inet_saddr = addr->sin_addr.s_addr;
374#if IS_ENABLED(CONFIG_IPV6)
375 } else if (saddr->sa_family == AF_INET6) {
376 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) saddr;
377 struct ipv6_pinfo *np = inet6_sk(sk);
Eric Dumazetefe42082013-10-03 15:42:29 -0700378 sk->sk_v6_rcv_saddr = np->saddr = addr->sin6_addr;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000379#endif
380 }
381}
382
Wu Fengguanga06a2d32013-06-12 21:04:16 +0800383static void ping_clear_saddr(struct sock *sk, int dif)
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000384{
385 sk->sk_bound_dev_if = dif;
386 if (sk->sk_family == AF_INET) {
387 struct inet_sock *isk = inet_sk(sk);
388 isk->inet_rcv_saddr = isk->inet_saddr = 0;
389#if IS_ENABLED(CONFIG_IPV6)
390 } else if (sk->sk_family == AF_INET6) {
391 struct ipv6_pinfo *np = inet6_sk(sk);
Eric Dumazetefe42082013-10-03 15:42:29 -0700392 memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr));
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000393 memset(&np->saddr, 0, sizeof(np->saddr));
394#endif
395 }
396}
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000397/*
398 * We need our own bind because there are no privileged id's == local ports.
399 * Moreover, we don't allow binding to multi- and broadcast addresses.
400 */
401
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000402int ping_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000403{
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000404 struct inet_sock *isk = inet_sk(sk);
405 unsigned short snum;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000406 int err;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000407 int dif = sk->sk_bound_dev_if;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000408
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000409 err = ping_check_bind_addr(sk, isk, uaddr, addr_len);
410 if (err)
411 return err;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000412
413 lock_sock(sk);
414
415 err = -EINVAL;
416 if (isk->inet_num != 0)
417 goto out;
418
419 err = -EADDRINUSE;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000420 ping_set_saddr(sk, uaddr);
421 snum = ntohs(((struct sockaddr_in *)uaddr)->sin_port);
422 if (ping_get_port(sk, snum) != 0) {
423 ping_clear_saddr(sk, dif);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000424 goto out;
425 }
426
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000427 pr_debug("after bind(): num = %d, dif = %d\n",
Joe Perches058bd4d2012-03-11 18:36:11 +0000428 (int)isk->inet_num,
Joe Perches058bd4d2012-03-11 18:36:11 +0000429 (int)sk->sk_bound_dev_if);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000430
431 err = 0;
Eric Dumazetc2bb06d2013-10-09 03:05:48 -0700432 if (sk->sk_family == AF_INET && isk->inet_rcv_saddr)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000433 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
Eric Dumazetc2bb06d2013-10-09 03:05:48 -0700434#if IS_ENABLED(CONFIG_IPV6)
435 if (sk->sk_family == AF_INET6 && !ipv6_addr_any(&sk->sk_v6_rcv_saddr))
436 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
437#endif
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000438
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000439 if (snum)
440 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
441 isk->inet_sport = htons(isk->inet_num);
442 isk->inet_daddr = 0;
443 isk->inet_dport = 0;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000444
445#if IS_ENABLED(CONFIG_IPV6)
446 if (sk->sk_family == AF_INET6)
Eric Dumazetefe42082013-10-03 15:42:29 -0700447 memset(&sk->sk_v6_daddr, 0, sizeof(sk->sk_v6_daddr));
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000448#endif
449
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000450 sk_dst_reset(sk);
451out:
452 release_sock(sk);
453 pr_debug("ping_v4_bind -> %d\n", err);
454 return err;
455}
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000456EXPORT_SYMBOL_GPL(ping_bind);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000457
458/*
459 * Is this a supported type of ICMP message?
460 */
461
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000462static inline int ping_supported(int family, int type, int code)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000463{
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000464 return (family == AF_INET && type == ICMP_ECHO && code == 0) ||
465 (family == AF_INET6 && type == ICMPV6_ECHO_REQUEST && code == 0);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000466}
467
468/*
469 * This routine is called by the ICMP module when it gets some
470 * sort of error condition.
471 */
472
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000473void ping_err(struct sk_buff *skb, int offset, u32 info)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000474{
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000475 int family;
476 struct icmphdr *icmph;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000477 struct inet_sock *inet_sock;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000478 int type;
479 int code;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000480 struct net *net = dev_net(skb->dev);
481 struct sock *sk;
482 int harderr;
483 int err;
484
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000485 if (skb->protocol == htons(ETH_P_IP)) {
486 family = AF_INET;
487 type = icmp_hdr(skb)->type;
488 code = icmp_hdr(skb)->code;
489 icmph = (struct icmphdr *)(skb->data + offset);
490 } else if (skb->protocol == htons(ETH_P_IPV6)) {
491 family = AF_INET6;
492 type = icmp6_hdr(skb)->icmp6_type;
493 code = icmp6_hdr(skb)->icmp6_code;
494 icmph = (struct icmphdr *) (skb->data + offset);
495 } else {
496 BUG();
497 }
498
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000499 /* We assume the packet has already been checked by icmp_unreach */
500
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000501 if (!ping_supported(family, icmph->type, icmph->code))
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000502 return;
503
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000504 pr_debug("ping_err(proto=0x%x,type=%d,code=%d,id=%04x,seq=%04x)\n",
505 skb->protocol, type, code, ntohs(icmph->un.echo.id),
506 ntohs(icmph->un.echo.sequence));
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000507
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000508 sk = ping_lookup(net, skb, ntohs(icmph->un.echo.id));
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000509 if (sk == NULL) {
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000510 pr_debug("no socket, dropping\n");
511 return; /* No socket for error */
512 }
513 pr_debug("err on socket %p\n", sk);
514
515 err = 0;
516 harderr = 0;
517 inet_sock = inet_sk(sk);
518
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000519 if (skb->protocol == htons(ETH_P_IP)) {
520 switch (type) {
521 default:
522 case ICMP_TIME_EXCEEDED:
523 err = EHOSTUNREACH;
524 break;
525 case ICMP_SOURCE_QUENCH:
526 /* This is not a real error but ping wants to see it.
527 * Report it with some fake errno.
528 */
529 err = EREMOTEIO;
530 break;
531 case ICMP_PARAMETERPROB:
532 err = EPROTO;
533 harderr = 1;
534 break;
535 case ICMP_DEST_UNREACH:
536 if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */
537 ipv4_sk_update_pmtu(skb, sk, info);
538 if (inet_sock->pmtudisc != IP_PMTUDISC_DONT) {
539 err = EMSGSIZE;
540 harderr = 1;
541 break;
542 }
543 goto out;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000544 }
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000545 err = EHOSTUNREACH;
546 if (code <= NR_ICMP_UNREACH) {
547 harderr = icmp_err_convert[code].fatal;
548 err = icmp_err_convert[code].errno;
549 }
550 break;
551 case ICMP_REDIRECT:
552 /* See ICMP_SOURCE_QUENCH */
553 ipv4_sk_redirect(skb, sk);
554 err = EREMOTEIO;
555 break;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000556 }
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000557#if IS_ENABLED(CONFIG_IPV6)
558 } else if (skb->protocol == htons(ETH_P_IPV6)) {
559 harderr = pingv6_ops.icmpv6_err_convert(type, code, &err);
560#endif
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000561 }
562
563 /*
564 * RFC1122: OK. Passes ICMP errors back to application, as per
565 * 4.1.3.3.
566 */
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000567 if ((family == AF_INET && !inet_sock->recverr) ||
568 (family == AF_INET6 && !inet6_sk(sk)->recverr)) {
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000569 if (!harderr || sk->sk_state != TCP_ESTABLISHED)
570 goto out;
571 } else {
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000572 if (family == AF_INET) {
573 ip_icmp_error(sk, skb, err, 0 /* no remote port */,
574 info, (u8 *)icmph);
575#if IS_ENABLED(CONFIG_IPV6)
576 } else if (family == AF_INET6) {
577 pingv6_ops.ipv6_icmp_error(sk, skb, err, 0,
578 info, (u8 *)icmph);
579#endif
580 }
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000581 }
582 sk->sk_err = err;
583 sk->sk_error_report(sk);
584out:
585 sock_put(sk);
586}
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000587EXPORT_SYMBOL_GPL(ping_err);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000588
589/*
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000590 * Copy and checksum an ICMP Echo packet from user space into a buffer
591 * starting from the payload.
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000592 */
593
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000594int ping_getfrag(void *from, char *to,
595 int offset, int fraglen, int odd, struct sk_buff *skb)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000596{
597 struct pingfakehdr *pfh = (struct pingfakehdr *)from;
598
599 if (offset == 0) {
600 if (fraglen < sizeof(struct icmphdr))
601 BUG();
602 if (csum_partial_copy_fromiovecend(to + sizeof(struct icmphdr),
603 pfh->iov, 0, fraglen - sizeof(struct icmphdr),
604 &pfh->wcheck))
605 return -EFAULT;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000606 } else if (offset < sizeof(struct icmphdr)) {
607 BUG();
608 } else {
609 if (csum_partial_copy_fromiovecend
610 (to, pfh->iov, offset - sizeof(struct icmphdr),
611 fraglen, &pfh->wcheck))
612 return -EFAULT;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000613 }
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000614
615#if IS_ENABLED(CONFIG_IPV6)
616 /* For IPv6, checksum each skb as we go along, as expected by
617 * icmpv6_push_pending_frames. For IPv4, accumulate the checksum in
618 * wcheck, it will be finalized in ping_v4_push_pending_frames.
619 */
620 if (pfh->family == AF_INET6) {
621 skb->csum = pfh->wcheck;
622 skb->ip_summed = CHECKSUM_NONE;
623 pfh->wcheck = 0;
624 }
625#endif
626
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000627 return 0;
628}
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000629EXPORT_SYMBOL_GPL(ping_getfrag);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000630
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000631static int ping_v4_push_pending_frames(struct sock *sk, struct pingfakehdr *pfh,
632 struct flowi4 *fl4)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000633{
634 struct sk_buff *skb = skb_peek(&sk->sk_write_queue);
635
636 pfh->wcheck = csum_partial((char *)&pfh->icmph,
637 sizeof(struct icmphdr), pfh->wcheck);
638 pfh->icmph.checksum = csum_fold(pfh->wcheck);
639 memcpy(icmp_hdr(skb), &pfh->icmph, sizeof(struct icmphdr));
640 skb->ip_summed = CHECKSUM_NONE;
641 return ip_push_pending_frames(sk, fl4);
642}
643
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000644int ping_common_sendmsg(int family, struct msghdr *msg, size_t len,
645 void *user_icmph, size_t icmph_len) {
646 u8 type, code;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000647
648 if (len > 0xFFFF)
649 return -EMSGSIZE;
650
651 /*
652 * Check the flags.
653 */
654
655 /* Mirror BSD error message compatibility */
656 if (msg->msg_flags & MSG_OOB)
657 return -EOPNOTSUPP;
658
659 /*
660 * Fetch the ICMP header provided by the userland.
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000661 * iovec is modified! The ICMP header is consumed.
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000662 */
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000663 if (memcpy_fromiovec(user_icmph, msg->msg_iov, icmph_len))
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000664 return -EFAULT;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000665
666 if (family == AF_INET) {
667 type = ((struct icmphdr *) user_icmph)->type;
668 code = ((struct icmphdr *) user_icmph)->code;
669#if IS_ENABLED(CONFIG_IPV6)
670 } else if (family == AF_INET6) {
671 type = ((struct icmp6hdr *) user_icmph)->icmp6_type;
672 code = ((struct icmp6hdr *) user_icmph)->icmp6_code;
673#endif
674 } else {
675 BUG();
676 }
677
678 if (!ping_supported(family, type, code))
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000679 return -EINVAL;
680
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000681 return 0;
682}
683EXPORT_SYMBOL_GPL(ping_common_sendmsg);
684
Stephen Hemmingerea074b32013-12-28 11:11:42 -0800685static int ping_v4_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
686 size_t len)
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000687{
688 struct net *net = sock_net(sk);
689 struct flowi4 fl4;
690 struct inet_sock *inet = inet_sk(sk);
691 struct ipcm_cookie ipc;
692 struct icmphdr user_icmph;
693 struct pingfakehdr pfh;
694 struct rtable *rt = NULL;
695 struct ip_options_data opt_copy;
696 int free = 0;
697 __be32 saddr, daddr, faddr;
698 u8 tos;
699 int err;
700
701 pr_debug("ping_v4_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num);
702
703 err = ping_common_sendmsg(AF_INET, msg, len, &user_icmph,
704 sizeof(user_icmph));
705 if (err)
706 return err;
707
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000708 /*
709 * Get and verify the address.
710 */
711
712 if (msg->msg_name) {
Steffen Hurrle342dfc32014-01-17 22:53:15 +0100713 DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000714 if (msg->msg_namelen < sizeof(*usin))
715 return -EINVAL;
716 if (usin->sin_family != AF_INET)
717 return -EINVAL;
718 daddr = usin->sin_addr.s_addr;
719 /* no remote port */
720 } else {
721 if (sk->sk_state != TCP_ESTABLISHED)
722 return -EDESTADDRREQ;
723 daddr = inet->inet_daddr;
724 /* no remote port */
725 }
726
727 ipc.addr = inet->inet_saddr;
728 ipc.opt = NULL;
729 ipc.oif = sk->sk_bound_dev_if;
730 ipc.tx_flags = 0;
Francesco Fuscoaa661582013-09-24 15:43:09 +0200731 ipc.ttl = 0;
732 ipc.tos = -1;
Daniel Borkmannbf84a012013-04-14 08:08:13 +0000733
734 sock_tx_timestamp(sk, &ipc.tx_flags);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000735
736 if (msg->msg_controllen) {
Hannes Frederic Sowac8e6ad02014-02-18 21:38:08 +0100737 err = ip_cmsg_send(sock_net(sk), msg, &ipc, false);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000738 if (err)
739 return err;
740 if (ipc.opt)
741 free = 1;
742 }
743 if (!ipc.opt) {
744 struct ip_options_rcu *inet_opt;
745
746 rcu_read_lock();
747 inet_opt = rcu_dereference(inet->inet_opt);
748 if (inet_opt) {
749 memcpy(&opt_copy, inet_opt,
750 sizeof(*inet_opt) + inet_opt->opt.optlen);
751 ipc.opt = &opt_copy.opt;
752 }
753 rcu_read_unlock();
754 }
755
756 saddr = ipc.addr;
757 ipc.addr = faddr = daddr;
758
759 if (ipc.opt && ipc.opt->opt.srr) {
760 if (!daddr)
761 return -EINVAL;
762 faddr = ipc.opt->opt.faddr;
763 }
Francesco Fuscoaa661582013-09-24 15:43:09 +0200764 tos = get_rttos(&ipc, inet);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000765 if (sock_flag(sk, SOCK_LOCALROUTE) ||
766 (msg->msg_flags & MSG_DONTROUTE) ||
767 (ipc.opt && ipc.opt->opt.is_strictroute)) {
768 tos |= RTO_ONLINK;
769 }
770
771 if (ipv4_is_multicast(daddr)) {
772 if (!ipc.oif)
773 ipc.oif = inet->mc_index;
774 if (!saddr)
775 saddr = inet->mc_addr;
Erich E. Hoover76e21052012-02-08 09:11:07 +0000776 } else if (!ipc.oif)
777 ipc.oif = inet->uc_index;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000778
779 flowi4_init_output(&fl4, ipc.oif, sk->sk_mark, tos,
780 RT_SCOPE_UNIVERSE, sk->sk_protocol,
781 inet_sk_flowi_flags(sk), faddr, saddr, 0, 0);
782
783 security_sk_classify_flow(sk, flowi4_to_flowi(&fl4));
784 rt = ip_route_output_flow(net, &fl4, sk);
785 if (IS_ERR(rt)) {
786 err = PTR_ERR(rt);
787 rt = NULL;
788 if (err == -ENETUNREACH)
Eric Dumazetf1d8cba2013-11-28 09:51:22 -0800789 IP_INC_STATS(net, IPSTATS_MIB_OUTNOROUTES);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000790 goto out;
791 }
792
793 err = -EACCES;
794 if ((rt->rt_flags & RTCF_BROADCAST) &&
795 !sock_flag(sk, SOCK_BROADCAST))
796 goto out;
797
798 if (msg->msg_flags & MSG_CONFIRM)
799 goto do_confirm;
800back_from_confirm:
801
802 if (!ipc.addr)
803 ipc.addr = fl4.daddr;
804
805 lock_sock(sk);
806
807 pfh.icmph.type = user_icmph.type; /* already checked */
808 pfh.icmph.code = user_icmph.code; /* ditto */
809 pfh.icmph.checksum = 0;
810 pfh.icmph.un.echo.id = inet->inet_sport;
811 pfh.icmph.un.echo.sequence = user_icmph.un.echo.sequence;
812 pfh.iov = msg->msg_iov;
813 pfh.wcheck = 0;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000814 pfh.family = AF_INET;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000815
816 err = ip_append_data(sk, &fl4, ping_getfrag, &pfh, len,
817 0, &ipc, &rt, msg->msg_flags);
818 if (err)
819 ip_flush_pending_frames(sk);
820 else
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000821 err = ping_v4_push_pending_frames(sk, &pfh, &fl4);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000822 release_sock(sk);
823
824out:
825 ip_rt_put(rt);
826 if (free)
827 kfree(ipc.opt);
828 if (!err) {
829 icmp_out_count(sock_net(sk), user_icmph.type);
830 return len;
831 }
832 return err;
833
834do_confirm:
835 dst_confirm(&rt->dst);
836 if (!(msg->msg_flags & MSG_PROBE) || len)
837 goto back_from_confirm;
838 err = 0;
839 goto out;
840}
841
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000842int ping_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
843 size_t len, int noblock, int flags, int *addr_len)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000844{
845 struct inet_sock *isk = inet_sk(sk);
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000846 int family = sk->sk_family;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000847 struct sk_buff *skb;
848 int copied, err;
849
850 pr_debug("ping_recvmsg(sk=%p,sk->num=%u)\n", isk, isk->inet_num);
851
David S. Millera5e74242012-02-21 17:59:19 -0500852 err = -EOPNOTSUPP;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000853 if (flags & MSG_OOB)
854 goto out;
855
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000856 if (flags & MSG_ERRQUEUE) {
857 if (family == AF_INET) {
Hannes Frederic Sowa85fbaa72013-11-23 00:46:12 +0100858 return ip_recv_error(sk, msg, len, addr_len);
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000859#if IS_ENABLED(CONFIG_IPV6)
860 } else if (family == AF_INET6) {
Hannes Frederic Sowa85fbaa72013-11-23 00:46:12 +0100861 return pingv6_ops.ipv6_recv_error(sk, msg, len,
862 addr_len);
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000863#endif
864 }
865 }
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000866
867 skb = skb_recv_datagram(sk, flags, noblock, &err);
868 if (!skb)
869 goto out;
870
871 copied = skb->len;
872 if (copied > len) {
873 msg->msg_flags |= MSG_TRUNC;
874 copied = len;
875 }
876
877 /* Don't bother checking the checksum */
878 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
879 if (err)
880 goto done;
881
882 sock_recv_timestamp(msg, sk, skb);
883
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000884 /* Copy the address and add cmsg data. */
885 if (family == AF_INET) {
Steffen Hurrle342dfc32014-01-17 22:53:15 +0100886 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
Hannes Frederic Sowabceaa902013-11-18 04:20:45 +0100887
Hannes Frederic Sowacf970c02013-11-18 07:07:45 +0100888 if (sin) {
889 sin->sin_family = AF_INET;
890 sin->sin_port = 0 /* skb->h.uh->source */;
891 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
892 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
893 *addr_len = sizeof(*sin);
894 }
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000895
896 if (isk->cmsg_flags)
897 ip_cmsg_recv(msg, skb);
898
899#if IS_ENABLED(CONFIG_IPV6)
900 } else if (family == AF_INET6) {
901 struct ipv6_pinfo *np = inet6_sk(sk);
902 struct ipv6hdr *ip6 = ipv6_hdr(skb);
Steffen Hurrle342dfc32014-01-17 22:53:15 +0100903 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000904
Hannes Frederic Sowacf970c02013-11-18 07:07:45 +0100905 if (sin6) {
906 sin6->sin6_family = AF_INET6;
907 sin6->sin6_port = 0;
908 sin6->sin6_addr = ip6->saddr;
909 sin6->sin6_flowinfo = 0;
910 if (np->sndflow)
911 sin6->sin6_flowinfo = ip6_flowinfo(ip6);
912 sin6->sin6_scope_id =
913 ipv6_iface_scope_id(&sin6->sin6_addr,
914 IP6CB(skb)->iif);
915 *addr_len = sizeof(*sin6);
916 }
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000917
918 if (inet6_sk(sk)->rxopt.all)
Hannes Frederic Sowa4b261c72014-01-20 03:43:08 +0100919 pingv6_ops.ip6_datagram_recv_common_ctl(sk, msg, skb);
920 if (skb->protocol == htons(ETH_P_IPV6) &&
921 inet6_sk(sk)->rxopt.all)
922 pingv6_ops.ip6_datagram_recv_specific_ctl(sk, msg, skb);
923 else if (skb->protocol == htons(ETH_P_IP) && isk->cmsg_flags)
924 ip_cmsg_recv(msg, skb);
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000925#endif
926 } else {
927 BUG();
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000928 }
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000929
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000930 err = copied;
931
932done:
933 skb_free_datagram(sk, skb);
934out:
935 pr_debug("ping_recvmsg -> %d\n", err);
936 return err;
937}
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000938EXPORT_SYMBOL_GPL(ping_recvmsg);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000939
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000940int ping_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000941{
942 pr_debug("ping_queue_rcv_skb(sk=%p,sk->num=%d,skb=%p)\n",
Joe Perches058bd4d2012-03-11 18:36:11 +0000943 inet_sk(sk), inet_sk(sk)->inet_num, skb);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000944 if (sock_queue_rcv_skb(sk, skb) < 0) {
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000945 kfree_skb(skb);
946 pr_debug("ping_queue_rcv_skb -> failed\n");
947 return -1;
948 }
949 return 0;
950}
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000951EXPORT_SYMBOL_GPL(ping_queue_rcv_skb);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000952
953
954/*
955 * All we need to do is get the socket.
956 */
957
958void ping_rcv(struct sk_buff *skb)
959{
960 struct sock *sk;
961 struct net *net = dev_net(skb->dev);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000962 struct icmphdr *icmph = icmp_hdr(skb);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000963
964 /* We assume the packet has already been checked by icmp_rcv */
965
966 pr_debug("ping_rcv(skb=%p,id=%04x,seq=%04x)\n",
Joe Perches058bd4d2012-03-11 18:36:11 +0000967 skb, ntohs(icmph->un.echo.id), ntohs(icmph->un.echo.sequence));
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000968
969 /* Push ICMP header back */
970 skb_push(skb, skb->data - (u8 *)icmph);
971
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000972 sk = ping_lookup(net, skb, ntohs(icmph->un.echo.id));
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000973 if (sk != NULL) {
974 pr_debug("rcv on socket %p\n", sk);
975 ping_queue_rcv_skb(sk, skb_get(skb));
976 sock_put(sk);
977 return;
978 }
979 pr_debug("no socket, dropping\n");
980
981 /* We're called from icmp_rcv(). kfree_skb() is done there. */
982}
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000983EXPORT_SYMBOL_GPL(ping_rcv);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000984
985struct proto ping_prot = {
986 .name = "PING",
987 .owner = THIS_MODULE,
988 .init = ping_init_sock,
989 .close = ping_close,
990 .connect = ip4_datagram_connect,
991 .disconnect = udp_disconnect,
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000992 .setsockopt = ip_setsockopt,
993 .getsockopt = ip_getsockopt,
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000994 .sendmsg = ping_v4_sendmsg,
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000995 .recvmsg = ping_recvmsg,
996 .bind = ping_bind,
997 .backlog_rcv = ping_queue_rcv_skb,
Steffen Klassert8141ed92013-01-21 02:00:03 +0000998 .release_cb = ip4_datagram_release_cb,
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000999 .hash = ping_hash,
1000 .unhash = ping_unhash,
1001 .get_port = ping_get_port,
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001002 .obj_size = sizeof(struct inet_sock),
1003};
1004EXPORT_SYMBOL(ping_prot);
1005
1006#ifdef CONFIG_PROC_FS
1007
1008static struct sock *ping_get_first(struct seq_file *seq, int start)
1009{
1010 struct sock *sk;
1011 struct ping_iter_state *state = seq->private;
1012 struct net *net = seq_file_net(seq);
1013
1014 for (state->bucket = start; state->bucket < PING_HTABLE_SIZE;
1015 ++state->bucket) {
1016 struct hlist_nulls_node *node;
Changli Gao75e308c2011-05-18 21:16:01 +00001017 struct hlist_nulls_head *hslot;
1018
1019 hslot = &ping_table.hash[state->bucket];
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001020
1021 if (hlist_nulls_empty(hslot))
1022 continue;
1023
1024 sk_nulls_for_each(sk, node, hslot) {
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001025 if (net_eq(sock_net(sk), net) &&
1026 sk->sk_family == state->family)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001027 goto found;
1028 }
1029 }
1030 sk = NULL;
1031found:
1032 return sk;
1033}
1034
1035static struct sock *ping_get_next(struct seq_file *seq, struct sock *sk)
1036{
1037 struct ping_iter_state *state = seq->private;
1038 struct net *net = seq_file_net(seq);
1039
1040 do {
1041 sk = sk_nulls_next(sk);
1042 } while (sk && (!net_eq(sock_net(sk), net)));
1043
1044 if (!sk)
1045 return ping_get_first(seq, state->bucket + 1);
1046 return sk;
1047}
1048
1049static struct sock *ping_get_idx(struct seq_file *seq, loff_t pos)
1050{
1051 struct sock *sk = ping_get_first(seq, 0);
1052
1053 if (sk)
1054 while (pos && (sk = ping_get_next(seq, sk)) != NULL)
1055 --pos;
1056 return pos ? NULL : sk;
1057}
1058
Lorenzo Colittid862e542013-05-31 15:05:50 +00001059void *ping_seq_start(struct seq_file *seq, loff_t *pos, sa_family_t family)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001060{
1061 struct ping_iter_state *state = seq->private;
1062 state->bucket = 0;
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001063 state->family = family;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001064
1065 read_lock_bh(&ping_table.lock);
1066
1067 return *pos ? ping_get_idx(seq, *pos-1) : SEQ_START_TOKEN;
1068}
Lorenzo Colittid862e542013-05-31 15:05:50 +00001069EXPORT_SYMBOL_GPL(ping_seq_start);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001070
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001071static void *ping_v4_seq_start(struct seq_file *seq, loff_t *pos)
1072{
1073 return ping_seq_start(seq, pos, AF_INET);
1074}
1075
Lorenzo Colittid862e542013-05-31 15:05:50 +00001076void *ping_seq_next(struct seq_file *seq, void *v, loff_t *pos)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001077{
1078 struct sock *sk;
1079
1080 if (v == SEQ_START_TOKEN)
1081 sk = ping_get_idx(seq, 0);
1082 else
1083 sk = ping_get_next(seq, v);
1084
1085 ++*pos;
1086 return sk;
1087}
Lorenzo Colittid862e542013-05-31 15:05:50 +00001088EXPORT_SYMBOL_GPL(ping_seq_next);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001089
Lorenzo Colittid862e542013-05-31 15:05:50 +00001090void ping_seq_stop(struct seq_file *seq, void *v)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001091{
1092 read_unlock_bh(&ping_table.lock);
1093}
Lorenzo Colittid862e542013-05-31 15:05:50 +00001094EXPORT_SYMBOL_GPL(ping_seq_stop);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001095
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001096static void ping_v4_format_sock(struct sock *sp, struct seq_file *f,
Tetsuo Handa652586d2013-11-14 14:31:57 -08001097 int bucket)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001098{
1099 struct inet_sock *inet = inet_sk(sp);
1100 __be32 dest = inet->inet_daddr;
1101 __be32 src = inet->inet_rcv_saddr;
1102 __u16 destp = ntohs(inet->inet_dport);
1103 __u16 srcp = ntohs(inet->inet_sport);
1104
1105 seq_printf(f, "%5d: %08X:%04X %08X:%04X"
Tetsuo Handa652586d2013-11-14 14:31:57 -08001106 " %02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d",
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001107 bucket, src, srcp, dest, destp, sp->sk_state,
1108 sk_wmem_alloc_get(sp),
1109 sk_rmem_alloc_get(sp),
Eric W. Biedermana7cb5a42012-05-24 01:10:10 -06001110 0, 0L, 0,
1111 from_kuid_munged(seq_user_ns(f), sock_i_uid(sp)),
1112 0, sock_i_ino(sp),
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001113 atomic_read(&sp->sk_refcnt), sp,
Tetsuo Handa652586d2013-11-14 14:31:57 -08001114 atomic_read(&sp->sk_drops));
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001115}
1116
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001117static int ping_v4_seq_show(struct seq_file *seq, void *v)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001118{
Tetsuo Handa652586d2013-11-14 14:31:57 -08001119 seq_setwidth(seq, 127);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001120 if (v == SEQ_START_TOKEN)
Tetsuo Handa652586d2013-11-14 14:31:57 -08001121 seq_puts(seq, " sl local_address rem_address st tx_queue "
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001122 "rx_queue tr tm->when retrnsmt uid timeout "
1123 "inode ref pointer drops");
1124 else {
1125 struct ping_iter_state *state = seq->private;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001126
Tetsuo Handa652586d2013-11-14 14:31:57 -08001127 ping_v4_format_sock(v, seq, state->bucket);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001128 }
Tetsuo Handa652586d2013-11-14 14:31:57 -08001129 seq_pad(seq, '\n');
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001130 return 0;
1131}
1132
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001133static const struct seq_operations ping_v4_seq_ops = {
1134 .show = ping_v4_seq_show,
1135 .start = ping_v4_seq_start,
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001136 .next = ping_seq_next,
1137 .stop = ping_seq_stop,
1138};
1139
1140static int ping_seq_open(struct inode *inode, struct file *file)
1141{
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001142 struct ping_seq_afinfo *afinfo = PDE_DATA(inode);
1143 return seq_open_net(inode, file, &afinfo->seq_ops,
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001144 sizeof(struct ping_iter_state));
1145}
1146
Lorenzo Colittid862e542013-05-31 15:05:50 +00001147const struct file_operations ping_seq_fops = {
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001148 .open = ping_seq_open,
1149 .read = seq_read,
1150 .llseek = seq_lseek,
1151 .release = seq_release_net,
1152};
Lorenzo Colittid862e542013-05-31 15:05:50 +00001153EXPORT_SYMBOL_GPL(ping_seq_fops);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001154
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001155static struct ping_seq_afinfo ping_v4_seq_afinfo = {
1156 .name = "icmp",
1157 .family = AF_INET,
1158 .seq_fops = &ping_seq_fops,
1159 .seq_ops = {
1160 .start = ping_v4_seq_start,
1161 .show = ping_v4_seq_show,
1162 .next = ping_seq_next,
1163 .stop = ping_seq_stop,
1164 },
1165};
1166
Lorenzo Colittid862e542013-05-31 15:05:50 +00001167int ping_proc_register(struct net *net, struct ping_seq_afinfo *afinfo)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001168{
1169 struct proc_dir_entry *p;
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001170 p = proc_create_data(afinfo->name, S_IRUGO, net->proc_net,
1171 afinfo->seq_fops, afinfo);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001172 if (!p)
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001173 return -ENOMEM;
1174 return 0;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001175}
Lorenzo Colittid862e542013-05-31 15:05:50 +00001176EXPORT_SYMBOL_GPL(ping_proc_register);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001177
Lorenzo Colittid862e542013-05-31 15:05:50 +00001178void ping_proc_unregister(struct net *net, struct ping_seq_afinfo *afinfo)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001179{
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001180 remove_proc_entry(afinfo->name, net->proc_net);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001181}
Lorenzo Colittid862e542013-05-31 15:05:50 +00001182EXPORT_SYMBOL_GPL(ping_proc_unregister);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001183
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001184static int __net_init ping_v4_proc_init_net(struct net *net)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001185{
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001186 return ping_proc_register(net, &ping_v4_seq_afinfo);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001187}
1188
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001189static void __net_exit ping_v4_proc_exit_net(struct net *net)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001190{
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001191 ping_proc_unregister(net, &ping_v4_seq_afinfo);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001192}
1193
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001194static struct pernet_operations ping_v4_net_ops = {
1195 .init = ping_v4_proc_init_net,
1196 .exit = ping_v4_proc_exit_net,
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001197};
1198
1199int __init ping_proc_init(void)
1200{
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001201 return register_pernet_subsys(&ping_v4_net_ops);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001202}
1203
1204void ping_proc_exit(void)
1205{
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001206 unregister_pernet_subsys(&ping_v4_net_ops);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001207}
1208
1209#endif
1210
1211void __init ping_init(void)
1212{
1213 int i;
1214
1215 for (i = 0; i < PING_HTABLE_SIZE; i++)
1216 INIT_HLIST_NULLS_HEAD(&ping_table.hash[i], i);
1217 rwlock_init(&ping_table.lock);
1218}