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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
Jane Zhou91a0b602014-11-24 11:44:08 -0800220 } else {
221 continue;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000222 }
223
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000224 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)
225 continue;
226
227 sock_hold(sk);
228 goto exit;
229 }
230
231 sk = NULL;
232exit:
233 read_unlock_bh(&ping_table.lock);
234
235 return sk;
236}
237
Eric W. Biederman7064d162012-05-24 10:34:21 -0600238static void inet_get_ping_group_range_net(struct net *net, kgid_t *low,
239 kgid_t *high)
Vasiliy Kulikovf56e03e2011-05-17 00:16:56 +0000240{
Cong Wangba6b9182014-05-06 11:02:50 -0700241 kgid_t *data = net->ipv4.ping_group_range.range;
Eric Dumazet95c96172012-04-15 05:58:06 +0000242 unsigned int seq;
243
Vasiliy Kulikovf56e03e2011-05-17 00:16:56 +0000244 do {
Cong Wangba6b9182014-05-06 11:02:50 -0700245 seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
Vasiliy Kulikovf56e03e2011-05-17 00:16:56 +0000246
247 *low = data[0];
248 *high = data[1];
Cong Wangba6b9182014-05-06 11:02:50 -0700249 } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
Vasiliy Kulikovf56e03e2011-05-17 00:16:56 +0000250}
251
252
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000253int ping_init_sock(struct sock *sk)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000254{
255 struct net *net = sock_net(sk);
Eric W. Biederman7064d162012-05-24 10:34:21 -0600256 kgid_t group = current_egid();
Wang, Xiaomingb04c4612014-04-14 12:30:45 -0400257 struct group_info *group_info;
258 int i, j, count;
Eric W. Biedermanae2975b2011-11-14 15:56:38 -0800259 kgid_t low, high;
Wang, Xiaomingb04c4612014-04-14 12:30:45 -0400260 int ret = 0;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000261
Eric W. Biederman7064d162012-05-24 10:34:21 -0600262 inet_get_ping_group_range_net(net, &low, &high);
263 if (gid_lte(low, group) && gid_lte(group, high))
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000264 return 0;
265
Wang, Xiaomingb04c4612014-04-14 12:30:45 -0400266 group_info = get_current_groups();
267 count = group_info->ngroups;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000268 for (i = 0; i < group_info->nblocks; i++) {
269 int cp_count = min_t(int, NGROUPS_PER_BLOCK, count);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000270 for (j = 0; j < cp_count; j++) {
Eric W. Biedermanae2975b2011-11-14 15:56:38 -0800271 kgid_t gid = group_info->blocks[i][j];
272 if (gid_lte(low, gid) && gid_lte(gid, high))
Wang, Xiaomingb04c4612014-04-14 12:30:45 -0400273 goto out_release_group;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000274 }
275
276 count -= cp_count;
277 }
278
Wang, Xiaomingb04c4612014-04-14 12:30:45 -0400279 ret = -EACCES;
280
281out_release_group:
282 put_group_info(group_info);
283 return ret;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000284}
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000285EXPORT_SYMBOL_GPL(ping_init_sock);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000286
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000287void ping_close(struct sock *sk, long timeout)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000288{
289 pr_debug("ping_close(sk=%p,sk->num=%u)\n",
Joe Perches058bd4d2012-03-11 18:36:11 +0000290 inet_sk(sk), inet_sk(sk)->inet_num);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000291 pr_debug("isk->refcnt = %d\n", sk->sk_refcnt.counter);
292
293 sk_common_release(sk);
294}
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000295EXPORT_SYMBOL_GPL(ping_close);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000296
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000297/* Checks the bind address and possibly modifies sk->sk_bound_dev_if. */
Wu Fengguanga06a2d32013-06-12 21:04:16 +0800298static int ping_check_bind_addr(struct sock *sk, struct inet_sock *isk,
299 struct sockaddr *uaddr, int addr_len) {
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000300 struct net *net = sock_net(sk);
301 if (sk->sk_family == AF_INET) {
302 struct sockaddr_in *addr = (struct sockaddr_in *) uaddr;
303 int chk_addr_ret;
304
305 if (addr_len < sizeof(*addr))
306 return -EINVAL;
307
308 pr_debug("ping_check_bind_addr(sk=%p,addr=%pI4,port=%d)\n",
309 sk, &addr->sin_addr.s_addr, ntohs(addr->sin_port));
310
311 chk_addr_ret = inet_addr_type(net, addr->sin_addr.s_addr);
312
313 if (addr->sin_addr.s_addr == htonl(INADDR_ANY))
314 chk_addr_ret = RTN_LOCAL;
315
Vincent Bernat49a60152014-09-05 15:09:03 +0200316 if ((net->ipv4.sysctl_ip_nonlocal_bind == 0 &&
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000317 isk->freebind == 0 && isk->transparent == 0 &&
318 chk_addr_ret != RTN_LOCAL) ||
319 chk_addr_ret == RTN_MULTICAST ||
320 chk_addr_ret == RTN_BROADCAST)
321 return -EADDRNOTAVAIL;
322
323#if IS_ENABLED(CONFIG_IPV6)
324 } else if (sk->sk_family == AF_INET6) {
325 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr;
326 int addr_type, scoped, has_addr;
327 struct net_device *dev = NULL;
328
329 if (addr_len < sizeof(*addr))
330 return -EINVAL;
331
Hannes Frederic Sowa82b276c2014-01-20 05:16:39 +0100332 if (addr->sin6_family != AF_INET6)
333 return -EINVAL;
334
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000335 pr_debug("ping_check_bind_addr(sk=%p,addr=%pI6c,port=%d)\n",
336 sk, addr->sin6_addr.s6_addr, ntohs(addr->sin6_port));
337
338 addr_type = ipv6_addr_type(&addr->sin6_addr);
339 scoped = __ipv6_addr_needs_scope_id(addr_type);
340 if ((addr_type != IPV6_ADDR_ANY &&
341 !(addr_type & IPV6_ADDR_UNICAST)) ||
342 (scoped && !addr->sin6_scope_id))
343 return -EINVAL;
344
345 rcu_read_lock();
346 if (addr->sin6_scope_id) {
347 dev = dev_get_by_index_rcu(net, addr->sin6_scope_id);
348 if (!dev) {
349 rcu_read_unlock();
350 return -ENODEV;
351 }
352 }
353 has_addr = pingv6_ops.ipv6_chk_addr(net, &addr->sin6_addr, dev,
354 scoped);
355 rcu_read_unlock();
356
357 if (!(isk->freebind || isk->transparent || has_addr ||
358 addr_type == IPV6_ADDR_ANY))
359 return -EADDRNOTAVAIL;
360
361 if (scoped)
362 sk->sk_bound_dev_if = addr->sin6_scope_id;
363#endif
364 } else {
365 return -EAFNOSUPPORT;
366 }
367 return 0;
368}
369
Wu Fengguanga06a2d32013-06-12 21:04:16 +0800370static void ping_set_saddr(struct sock *sk, struct sockaddr *saddr)
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000371{
372 if (saddr->sa_family == AF_INET) {
373 struct inet_sock *isk = inet_sk(sk);
374 struct sockaddr_in *addr = (struct sockaddr_in *) saddr;
375 isk->inet_rcv_saddr = isk->inet_saddr = addr->sin_addr.s_addr;
376#if IS_ENABLED(CONFIG_IPV6)
377 } else if (saddr->sa_family == AF_INET6) {
378 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) saddr;
379 struct ipv6_pinfo *np = inet6_sk(sk);
Eric Dumazetefe42082013-10-03 15:42:29 -0700380 sk->sk_v6_rcv_saddr = np->saddr = addr->sin6_addr;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000381#endif
382 }
383}
384
Wu Fengguanga06a2d32013-06-12 21:04:16 +0800385static void ping_clear_saddr(struct sock *sk, int dif)
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000386{
387 sk->sk_bound_dev_if = dif;
388 if (sk->sk_family == AF_INET) {
389 struct inet_sock *isk = inet_sk(sk);
390 isk->inet_rcv_saddr = isk->inet_saddr = 0;
391#if IS_ENABLED(CONFIG_IPV6)
392 } else if (sk->sk_family == AF_INET6) {
393 struct ipv6_pinfo *np = inet6_sk(sk);
Eric Dumazetefe42082013-10-03 15:42:29 -0700394 memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr));
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000395 memset(&np->saddr, 0, sizeof(np->saddr));
396#endif
397 }
398}
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000399/*
400 * We need our own bind because there are no privileged id's == local ports.
401 * Moreover, we don't allow binding to multi- and broadcast addresses.
402 */
403
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000404int ping_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000405{
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000406 struct inet_sock *isk = inet_sk(sk);
407 unsigned short snum;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000408 int err;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000409 int dif = sk->sk_bound_dev_if;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000410
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000411 err = ping_check_bind_addr(sk, isk, uaddr, addr_len);
412 if (err)
413 return err;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000414
415 lock_sock(sk);
416
417 err = -EINVAL;
418 if (isk->inet_num != 0)
419 goto out;
420
421 err = -EADDRINUSE;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000422 ping_set_saddr(sk, uaddr);
423 snum = ntohs(((struct sockaddr_in *)uaddr)->sin_port);
424 if (ping_get_port(sk, snum) != 0) {
425 ping_clear_saddr(sk, dif);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000426 goto out;
427 }
428
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000429 pr_debug("after bind(): num = %d, dif = %d\n",
Joe Perches058bd4d2012-03-11 18:36:11 +0000430 (int)isk->inet_num,
Joe Perches058bd4d2012-03-11 18:36:11 +0000431 (int)sk->sk_bound_dev_if);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000432
433 err = 0;
Eric Dumazetc2bb06d2013-10-09 03:05:48 -0700434 if (sk->sk_family == AF_INET && isk->inet_rcv_saddr)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000435 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
Eric Dumazetc2bb06d2013-10-09 03:05:48 -0700436#if IS_ENABLED(CONFIG_IPV6)
437 if (sk->sk_family == AF_INET6 && !ipv6_addr_any(&sk->sk_v6_rcv_saddr))
438 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
439#endif
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000440
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000441 if (snum)
442 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
443 isk->inet_sport = htons(isk->inet_num);
444 isk->inet_daddr = 0;
445 isk->inet_dport = 0;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000446
447#if IS_ENABLED(CONFIG_IPV6)
448 if (sk->sk_family == AF_INET6)
Eric Dumazetefe42082013-10-03 15:42:29 -0700449 memset(&sk->sk_v6_daddr, 0, sizeof(sk->sk_v6_daddr));
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000450#endif
451
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000452 sk_dst_reset(sk);
453out:
454 release_sock(sk);
455 pr_debug("ping_v4_bind -> %d\n", err);
456 return err;
457}
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000458EXPORT_SYMBOL_GPL(ping_bind);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000459
460/*
461 * Is this a supported type of ICMP message?
462 */
463
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000464static inline int ping_supported(int family, int type, int code)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000465{
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000466 return (family == AF_INET && type == ICMP_ECHO && code == 0) ||
467 (family == AF_INET6 && type == ICMPV6_ECHO_REQUEST && code == 0);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000468}
469
470/*
471 * This routine is called by the ICMP module when it gets some
472 * sort of error condition.
473 */
474
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000475void ping_err(struct sk_buff *skb, int offset, u32 info)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000476{
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000477 int family;
478 struct icmphdr *icmph;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000479 struct inet_sock *inet_sock;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000480 int type;
481 int code;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000482 struct net *net = dev_net(skb->dev);
483 struct sock *sk;
484 int harderr;
485 int err;
486
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000487 if (skb->protocol == htons(ETH_P_IP)) {
488 family = AF_INET;
489 type = icmp_hdr(skb)->type;
490 code = icmp_hdr(skb)->code;
491 icmph = (struct icmphdr *)(skb->data + offset);
492 } else if (skb->protocol == htons(ETH_P_IPV6)) {
493 family = AF_INET6;
494 type = icmp6_hdr(skb)->icmp6_type;
495 code = icmp6_hdr(skb)->icmp6_code;
496 icmph = (struct icmphdr *) (skb->data + offset);
497 } else {
498 BUG();
499 }
500
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000501 /* We assume the packet has already been checked by icmp_unreach */
502
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000503 if (!ping_supported(family, icmph->type, icmph->code))
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000504 return;
505
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000506 pr_debug("ping_err(proto=0x%x,type=%d,code=%d,id=%04x,seq=%04x)\n",
507 skb->protocol, type, code, ntohs(icmph->un.echo.id),
508 ntohs(icmph->un.echo.sequence));
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000509
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000510 sk = ping_lookup(net, skb, ntohs(icmph->un.echo.id));
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000511 if (sk == NULL) {
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000512 pr_debug("no socket, dropping\n");
513 return; /* No socket for error */
514 }
515 pr_debug("err on socket %p\n", sk);
516
517 err = 0;
518 harderr = 0;
519 inet_sock = inet_sk(sk);
520
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000521 if (skb->protocol == htons(ETH_P_IP)) {
522 switch (type) {
523 default:
524 case ICMP_TIME_EXCEEDED:
525 err = EHOSTUNREACH;
526 break;
527 case ICMP_SOURCE_QUENCH:
528 /* This is not a real error but ping wants to see it.
529 * Report it with some fake errno.
530 */
531 err = EREMOTEIO;
532 break;
533 case ICMP_PARAMETERPROB:
534 err = EPROTO;
535 harderr = 1;
536 break;
537 case ICMP_DEST_UNREACH:
538 if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */
539 ipv4_sk_update_pmtu(skb, sk, info);
540 if (inet_sock->pmtudisc != IP_PMTUDISC_DONT) {
541 err = EMSGSIZE;
542 harderr = 1;
543 break;
544 }
545 goto out;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000546 }
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000547 err = EHOSTUNREACH;
548 if (code <= NR_ICMP_UNREACH) {
549 harderr = icmp_err_convert[code].fatal;
550 err = icmp_err_convert[code].errno;
551 }
552 break;
553 case ICMP_REDIRECT:
554 /* See ICMP_SOURCE_QUENCH */
555 ipv4_sk_redirect(skb, sk);
556 err = EREMOTEIO;
557 break;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000558 }
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000559#if IS_ENABLED(CONFIG_IPV6)
560 } else if (skb->protocol == htons(ETH_P_IPV6)) {
561 harderr = pingv6_ops.icmpv6_err_convert(type, code, &err);
562#endif
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000563 }
564
565 /*
566 * RFC1122: OK. Passes ICMP errors back to application, as per
567 * 4.1.3.3.
568 */
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000569 if ((family == AF_INET && !inet_sock->recverr) ||
570 (family == AF_INET6 && !inet6_sk(sk)->recverr)) {
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000571 if (!harderr || sk->sk_state != TCP_ESTABLISHED)
572 goto out;
573 } else {
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000574 if (family == AF_INET) {
575 ip_icmp_error(sk, skb, err, 0 /* no remote port */,
576 info, (u8 *)icmph);
577#if IS_ENABLED(CONFIG_IPV6)
578 } else if (family == AF_INET6) {
579 pingv6_ops.ipv6_icmp_error(sk, skb, err, 0,
580 info, (u8 *)icmph);
581#endif
582 }
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000583 }
584 sk->sk_err = err;
585 sk->sk_error_report(sk);
586out:
587 sock_put(sk);
588}
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000589EXPORT_SYMBOL_GPL(ping_err);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000590
591/*
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000592 * Copy and checksum an ICMP Echo packet from user space into a buffer
593 * starting from the payload.
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000594 */
595
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000596int ping_getfrag(void *from, char *to,
597 int offset, int fraglen, int odd, struct sk_buff *skb)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000598{
599 struct pingfakehdr *pfh = (struct pingfakehdr *)from;
600
601 if (offset == 0) {
Al Viro21226ab2014-11-28 15:48:29 -0500602 fraglen -= sizeof(struct icmphdr);
603 if (fraglen < 0)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000604 BUG();
Al Viro21226ab2014-11-28 15:48:29 -0500605 if (csum_and_copy_from_iter(to + sizeof(struct icmphdr),
606 fraglen, &pfh->wcheck,
607 &pfh->msg->msg_iter) != fraglen)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000608 return -EFAULT;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000609 } else if (offset < sizeof(struct icmphdr)) {
610 BUG();
611 } else {
Al Viro21226ab2014-11-28 15:48:29 -0500612 if (csum_and_copy_from_iter(to, fraglen, &pfh->wcheck,
613 &pfh->msg->msg_iter) != fraglen)
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000614 return -EFAULT;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000615 }
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000616
617#if IS_ENABLED(CONFIG_IPV6)
618 /* For IPv6, checksum each skb as we go along, as expected by
619 * icmpv6_push_pending_frames. For IPv4, accumulate the checksum in
620 * wcheck, it will be finalized in ping_v4_push_pending_frames.
621 */
622 if (pfh->family == AF_INET6) {
623 skb->csum = pfh->wcheck;
624 skb->ip_summed = CHECKSUM_NONE;
625 pfh->wcheck = 0;
626 }
627#endif
628
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000629 return 0;
630}
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000631EXPORT_SYMBOL_GPL(ping_getfrag);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000632
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000633static int ping_v4_push_pending_frames(struct sock *sk, struct pingfakehdr *pfh,
634 struct flowi4 *fl4)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000635{
636 struct sk_buff *skb = skb_peek(&sk->sk_write_queue);
637
638 pfh->wcheck = csum_partial((char *)&pfh->icmph,
639 sizeof(struct icmphdr), pfh->wcheck);
640 pfh->icmph.checksum = csum_fold(pfh->wcheck);
641 memcpy(icmp_hdr(skb), &pfh->icmph, sizeof(struct icmphdr));
642 skb->ip_summed = CHECKSUM_NONE;
643 return ip_push_pending_frames(sk, fl4);
644}
645
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000646int ping_common_sendmsg(int family, struct msghdr *msg, size_t len,
647 void *user_icmph, size_t icmph_len) {
648 u8 type, code;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000649
650 if (len > 0xFFFF)
651 return -EMSGSIZE;
652
653 /*
654 * Check the flags.
655 */
656
657 /* Mirror BSD error message compatibility */
658 if (msg->msg_flags & MSG_OOB)
659 return -EOPNOTSUPP;
660
661 /*
662 * Fetch the ICMP header provided by the userland.
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000663 * iovec is modified! The ICMP header is consumed.
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000664 */
Al Viro6ce8e9c2014-04-06 21:25:44 -0400665 if (memcpy_from_msg(user_icmph, msg, icmph_len))
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000666 return -EFAULT;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000667
668 if (family == AF_INET) {
669 type = ((struct icmphdr *) user_icmph)->type;
670 code = ((struct icmphdr *) user_icmph)->code;
671#if IS_ENABLED(CONFIG_IPV6)
672 } else if (family == AF_INET6) {
673 type = ((struct icmp6hdr *) user_icmph)->icmp6_type;
674 code = ((struct icmp6hdr *) user_icmph)->icmp6_code;
675#endif
676 } else {
677 BUG();
678 }
679
680 if (!ping_supported(family, type, code))
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000681 return -EINVAL;
682
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000683 return 0;
684}
685EXPORT_SYMBOL_GPL(ping_common_sendmsg);
686
Stephen Hemmingerea074b32013-12-28 11:11:42 -0800687static int ping_v4_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
688 size_t len)
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000689{
690 struct net *net = sock_net(sk);
691 struct flowi4 fl4;
692 struct inet_sock *inet = inet_sk(sk);
693 struct ipcm_cookie ipc;
694 struct icmphdr user_icmph;
695 struct pingfakehdr pfh;
696 struct rtable *rt = NULL;
697 struct ip_options_data opt_copy;
698 int free = 0;
699 __be32 saddr, daddr, faddr;
700 u8 tos;
701 int err;
702
703 pr_debug("ping_v4_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num);
704
705 err = ping_common_sendmsg(AF_INET, msg, len, &user_icmph,
706 sizeof(user_icmph));
707 if (err)
708 return err;
709
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000710 /*
711 * Get and verify the address.
712 */
713
714 if (msg->msg_name) {
Steffen Hurrle342dfc32014-01-17 22:53:15 +0100715 DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000716 if (msg->msg_namelen < sizeof(*usin))
717 return -EINVAL;
718 if (usin->sin_family != AF_INET)
719 return -EINVAL;
720 daddr = usin->sin_addr.s_addr;
721 /* no remote port */
722 } else {
723 if (sk->sk_state != TCP_ESTABLISHED)
724 return -EDESTADDRREQ;
725 daddr = inet->inet_daddr;
726 /* no remote port */
727 }
728
729 ipc.addr = inet->inet_saddr;
730 ipc.opt = NULL;
731 ipc.oif = sk->sk_bound_dev_if;
732 ipc.tx_flags = 0;
Francesco Fuscoaa661582013-09-24 15:43:09 +0200733 ipc.ttl = 0;
734 ipc.tos = -1;
Daniel Borkmannbf84a012013-04-14 08:08:13 +0000735
736 sock_tx_timestamp(sk, &ipc.tx_flags);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000737
738 if (msg->msg_controllen) {
Hannes Frederic Sowac8e6ad02014-02-18 21:38:08 +0100739 err = ip_cmsg_send(sock_net(sk), msg, &ipc, false);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000740 if (err)
741 return err;
742 if (ipc.opt)
743 free = 1;
744 }
745 if (!ipc.opt) {
746 struct ip_options_rcu *inet_opt;
747
748 rcu_read_lock();
749 inet_opt = rcu_dereference(inet->inet_opt);
750 if (inet_opt) {
751 memcpy(&opt_copy, inet_opt,
752 sizeof(*inet_opt) + inet_opt->opt.optlen);
753 ipc.opt = &opt_copy.opt;
754 }
755 rcu_read_unlock();
756 }
757
758 saddr = ipc.addr;
759 ipc.addr = faddr = daddr;
760
761 if (ipc.opt && ipc.opt->opt.srr) {
762 if (!daddr)
763 return -EINVAL;
764 faddr = ipc.opt->opt.faddr;
765 }
Francesco Fuscoaa661582013-09-24 15:43:09 +0200766 tos = get_rttos(&ipc, inet);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000767 if (sock_flag(sk, SOCK_LOCALROUTE) ||
768 (msg->msg_flags & MSG_DONTROUTE) ||
769 (ipc.opt && ipc.opt->opt.is_strictroute)) {
770 tos |= RTO_ONLINK;
771 }
772
773 if (ipv4_is_multicast(daddr)) {
774 if (!ipc.oif)
775 ipc.oif = inet->mc_index;
776 if (!saddr)
777 saddr = inet->mc_addr;
Erich E. Hoover76e21052012-02-08 09:11:07 +0000778 } else if (!ipc.oif)
779 ipc.oif = inet->uc_index;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000780
781 flowi4_init_output(&fl4, ipc.oif, sk->sk_mark, tos,
782 RT_SCOPE_UNIVERSE, sk->sk_protocol,
783 inet_sk_flowi_flags(sk), faddr, saddr, 0, 0);
784
785 security_sk_classify_flow(sk, flowi4_to_flowi(&fl4));
786 rt = ip_route_output_flow(net, &fl4, sk);
787 if (IS_ERR(rt)) {
788 err = PTR_ERR(rt);
789 rt = NULL;
790 if (err == -ENETUNREACH)
Eric Dumazetf1d8cba2013-11-28 09:51:22 -0800791 IP_INC_STATS(net, IPSTATS_MIB_OUTNOROUTES);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000792 goto out;
793 }
794
795 err = -EACCES;
796 if ((rt->rt_flags & RTCF_BROADCAST) &&
797 !sock_flag(sk, SOCK_BROADCAST))
798 goto out;
799
800 if (msg->msg_flags & MSG_CONFIRM)
801 goto do_confirm;
802back_from_confirm:
803
804 if (!ipc.addr)
805 ipc.addr = fl4.daddr;
806
807 lock_sock(sk);
808
809 pfh.icmph.type = user_icmph.type; /* already checked */
810 pfh.icmph.code = user_icmph.code; /* ditto */
811 pfh.icmph.checksum = 0;
812 pfh.icmph.un.echo.id = inet->inet_sport;
813 pfh.icmph.un.echo.sequence = user_icmph.un.echo.sequence;
Al Virocacdc7d2014-11-27 20:34:16 -0500814 pfh.msg = msg;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000815 pfh.wcheck = 0;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000816 pfh.family = AF_INET;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000817
818 err = ip_append_data(sk, &fl4, ping_getfrag, &pfh, len,
819 0, &ipc, &rt, msg->msg_flags);
820 if (err)
821 ip_flush_pending_frames(sk);
822 else
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000823 err = ping_v4_push_pending_frames(sk, &pfh, &fl4);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000824 release_sock(sk);
825
826out:
827 ip_rt_put(rt);
828 if (free)
829 kfree(ipc.opt);
830 if (!err) {
831 icmp_out_count(sock_net(sk), user_icmph.type);
832 return len;
833 }
834 return err;
835
836do_confirm:
837 dst_confirm(&rt->dst);
838 if (!(msg->msg_flags & MSG_PROBE) || len)
839 goto back_from_confirm;
840 err = 0;
841 goto out;
842}
843
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000844int ping_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
845 size_t len, int noblock, int flags, int *addr_len)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000846{
847 struct inet_sock *isk = inet_sk(sk);
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000848 int family = sk->sk_family;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000849 struct sk_buff *skb;
850 int copied, err;
851
852 pr_debug("ping_recvmsg(sk=%p,sk->num=%u)\n", isk, isk->inet_num);
853
David S. Millera5e74242012-02-21 17:59:19 -0500854 err = -EOPNOTSUPP;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000855 if (flags & MSG_OOB)
856 goto out;
857
Willem de Bruijnf4713a32014-11-26 14:53:02 -0500858 if (flags & MSG_ERRQUEUE)
859 return inet_recv_error(sk, msg, len, addr_len);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000860
861 skb = skb_recv_datagram(sk, flags, noblock, &err);
862 if (!skb)
863 goto out;
864
865 copied = skb->len;
866 if (copied > len) {
867 msg->msg_flags |= MSG_TRUNC;
868 copied = len;
869 }
870
871 /* Don't bother checking the checksum */
David S. Miller51f3d022014-11-05 16:46:40 -0500872 err = skb_copy_datagram_msg(skb, 0, msg, copied);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000873 if (err)
874 goto done;
875
876 sock_recv_timestamp(msg, sk, skb);
877
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000878 /* Copy the address and add cmsg data. */
879 if (family == AF_INET) {
Steffen Hurrle342dfc32014-01-17 22:53:15 +0100880 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
Hannes Frederic Sowabceaa902013-11-18 04:20:45 +0100881
Hannes Frederic Sowacf970c02013-11-18 07:07:45 +0100882 if (sin) {
883 sin->sin_family = AF_INET;
884 sin->sin_port = 0 /* skb->h.uh->source */;
885 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
886 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
887 *addr_len = sizeof(*sin);
888 }
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000889
890 if (isk->cmsg_flags)
891 ip_cmsg_recv(msg, skb);
892
893#if IS_ENABLED(CONFIG_IPV6)
894 } else if (family == AF_INET6) {
895 struct ipv6_pinfo *np = inet6_sk(sk);
896 struct ipv6hdr *ip6 = ipv6_hdr(skb);
Steffen Hurrle342dfc32014-01-17 22:53:15 +0100897 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000898
Hannes Frederic Sowacf970c02013-11-18 07:07:45 +0100899 if (sin6) {
900 sin6->sin6_family = AF_INET6;
901 sin6->sin6_port = 0;
902 sin6->sin6_addr = ip6->saddr;
903 sin6->sin6_flowinfo = 0;
904 if (np->sndflow)
905 sin6->sin6_flowinfo = ip6_flowinfo(ip6);
906 sin6->sin6_scope_id =
907 ipv6_iface_scope_id(&sin6->sin6_addr,
Duan Jiong43304872014-08-01 09:52:58 +0800908 inet6_iif(skb));
Hannes Frederic Sowacf970c02013-11-18 07:07:45 +0100909 *addr_len = sizeof(*sin6);
910 }
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000911
912 if (inet6_sk(sk)->rxopt.all)
Hannes Frederic Sowa4b261c72014-01-20 03:43:08 +0100913 pingv6_ops.ip6_datagram_recv_common_ctl(sk, msg, skb);
914 if (skb->protocol == htons(ETH_P_IPV6) &&
915 inet6_sk(sk)->rxopt.all)
916 pingv6_ops.ip6_datagram_recv_specific_ctl(sk, msg, skb);
917 else if (skb->protocol == htons(ETH_P_IP) && isk->cmsg_flags)
918 ip_cmsg_recv(msg, skb);
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000919#endif
920 } else {
921 BUG();
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000922 }
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000923
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000924 err = copied;
925
926done:
927 skb_free_datagram(sk, skb);
928out:
929 pr_debug("ping_recvmsg -> %d\n", err);
930 return err;
931}
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000932EXPORT_SYMBOL_GPL(ping_recvmsg);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000933
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000934int ping_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000935{
936 pr_debug("ping_queue_rcv_skb(sk=%p,sk->num=%d,skb=%p)\n",
Joe Perches058bd4d2012-03-11 18:36:11 +0000937 inet_sk(sk), inet_sk(sk)->inet_num, skb);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000938 if (sock_queue_rcv_skb(sk, skb) < 0) {
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000939 kfree_skb(skb);
940 pr_debug("ping_queue_rcv_skb -> failed\n");
941 return -1;
942 }
943 return 0;
944}
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000945EXPORT_SYMBOL_GPL(ping_queue_rcv_skb);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000946
947
948/*
949 * All we need to do is get the socket.
950 */
951
Rick Jonese3e32172014-11-17 14:04:29 -0800952bool ping_rcv(struct sk_buff *skb)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000953{
954 struct sock *sk;
955 struct net *net = dev_net(skb->dev);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000956 struct icmphdr *icmph = icmp_hdr(skb);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000957
958 /* We assume the packet has already been checked by icmp_rcv */
959
960 pr_debug("ping_rcv(skb=%p,id=%04x,seq=%04x)\n",
Joe Perches058bd4d2012-03-11 18:36:11 +0000961 skb, ntohs(icmph->un.echo.id), ntohs(icmph->un.echo.sequence));
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000962
963 /* Push ICMP header back */
964 skb_push(skb, skb->data - (u8 *)icmph);
965
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000966 sk = ping_lookup(net, skb, ntohs(icmph->un.echo.id));
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000967 if (sk != NULL) {
subashab@codeaurora.orgfc752f12015-01-23 22:26:02 +0000968 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
969
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000970 pr_debug("rcv on socket %p\n", sk);
subashab@codeaurora.orgfc752f12015-01-23 22:26:02 +0000971 if (skb2)
972 ping_queue_rcv_skb(sk, skb2);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000973 sock_put(sk);
Rick Jonese3e32172014-11-17 14:04:29 -0800974 return true;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000975 }
976 pr_debug("no socket, dropping\n");
977
Rick Jonese3e32172014-11-17 14:04:29 -0800978 return false;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000979}
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000980EXPORT_SYMBOL_GPL(ping_rcv);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000981
982struct proto ping_prot = {
983 .name = "PING",
984 .owner = THIS_MODULE,
985 .init = ping_init_sock,
986 .close = ping_close,
987 .connect = ip4_datagram_connect,
988 .disconnect = udp_disconnect,
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000989 .setsockopt = ip_setsockopt,
990 .getsockopt = ip_getsockopt,
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000991 .sendmsg = ping_v4_sendmsg,
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000992 .recvmsg = ping_recvmsg,
993 .bind = ping_bind,
994 .backlog_rcv = ping_queue_rcv_skb,
Steffen Klassert8141ed92013-01-21 02:00:03 +0000995 .release_cb = ip4_datagram_release_cb,
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000996 .hash = ping_hash,
997 .unhash = ping_unhash,
998 .get_port = ping_get_port,
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000999 .obj_size = sizeof(struct inet_sock),
1000};
1001EXPORT_SYMBOL(ping_prot);
1002
1003#ifdef CONFIG_PROC_FS
1004
1005static struct sock *ping_get_first(struct seq_file *seq, int start)
1006{
1007 struct sock *sk;
1008 struct ping_iter_state *state = seq->private;
1009 struct net *net = seq_file_net(seq);
1010
1011 for (state->bucket = start; state->bucket < PING_HTABLE_SIZE;
1012 ++state->bucket) {
1013 struct hlist_nulls_node *node;
Changli Gao75e308c2011-05-18 21:16:01 +00001014 struct hlist_nulls_head *hslot;
1015
1016 hslot = &ping_table.hash[state->bucket];
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001017
1018 if (hlist_nulls_empty(hslot))
1019 continue;
1020
1021 sk_nulls_for_each(sk, node, hslot) {
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001022 if (net_eq(sock_net(sk), net) &&
1023 sk->sk_family == state->family)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001024 goto found;
1025 }
1026 }
1027 sk = NULL;
1028found:
1029 return sk;
1030}
1031
1032static struct sock *ping_get_next(struct seq_file *seq, struct sock *sk)
1033{
1034 struct ping_iter_state *state = seq->private;
1035 struct net *net = seq_file_net(seq);
1036
1037 do {
1038 sk = sk_nulls_next(sk);
1039 } while (sk && (!net_eq(sock_net(sk), net)));
1040
1041 if (!sk)
1042 return ping_get_first(seq, state->bucket + 1);
1043 return sk;
1044}
1045
1046static struct sock *ping_get_idx(struct seq_file *seq, loff_t pos)
1047{
1048 struct sock *sk = ping_get_first(seq, 0);
1049
1050 if (sk)
1051 while (pos && (sk = ping_get_next(seq, sk)) != NULL)
1052 --pos;
1053 return pos ? NULL : sk;
1054}
1055
Lorenzo Colittid862e542013-05-31 15:05:50 +00001056void *ping_seq_start(struct seq_file *seq, loff_t *pos, sa_family_t family)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001057{
1058 struct ping_iter_state *state = seq->private;
1059 state->bucket = 0;
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001060 state->family = family;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001061
1062 read_lock_bh(&ping_table.lock);
1063
1064 return *pos ? ping_get_idx(seq, *pos-1) : SEQ_START_TOKEN;
1065}
Lorenzo Colittid862e542013-05-31 15:05:50 +00001066EXPORT_SYMBOL_GPL(ping_seq_start);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001067
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001068static void *ping_v4_seq_start(struct seq_file *seq, loff_t *pos)
1069{
1070 return ping_seq_start(seq, pos, AF_INET);
1071}
1072
Lorenzo Colittid862e542013-05-31 15:05:50 +00001073void *ping_seq_next(struct seq_file *seq, void *v, loff_t *pos)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001074{
1075 struct sock *sk;
1076
1077 if (v == SEQ_START_TOKEN)
1078 sk = ping_get_idx(seq, 0);
1079 else
1080 sk = ping_get_next(seq, v);
1081
1082 ++*pos;
1083 return sk;
1084}
Lorenzo Colittid862e542013-05-31 15:05:50 +00001085EXPORT_SYMBOL_GPL(ping_seq_next);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001086
Lorenzo Colittid862e542013-05-31 15:05:50 +00001087void ping_seq_stop(struct seq_file *seq, void *v)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001088{
1089 read_unlock_bh(&ping_table.lock);
1090}
Lorenzo Colittid862e542013-05-31 15:05:50 +00001091EXPORT_SYMBOL_GPL(ping_seq_stop);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001092
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001093static void ping_v4_format_sock(struct sock *sp, struct seq_file *f,
Tetsuo Handa652586d2013-11-14 14:31:57 -08001094 int bucket)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001095{
1096 struct inet_sock *inet = inet_sk(sp);
1097 __be32 dest = inet->inet_daddr;
1098 __be32 src = inet->inet_rcv_saddr;
1099 __u16 destp = ntohs(inet->inet_dport);
1100 __u16 srcp = ntohs(inet->inet_sport);
1101
1102 seq_printf(f, "%5d: %08X:%04X %08X:%04X"
Tetsuo Handa652586d2013-11-14 14:31:57 -08001103 " %02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d",
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001104 bucket, src, srcp, dest, destp, sp->sk_state,
1105 sk_wmem_alloc_get(sp),
1106 sk_rmem_alloc_get(sp),
Eric W. Biedermana7cb5a42012-05-24 01:10:10 -06001107 0, 0L, 0,
1108 from_kuid_munged(seq_user_ns(f), sock_i_uid(sp)),
1109 0, sock_i_ino(sp),
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001110 atomic_read(&sp->sk_refcnt), sp,
Tetsuo Handa652586d2013-11-14 14:31:57 -08001111 atomic_read(&sp->sk_drops));
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001112}
1113
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001114static int ping_v4_seq_show(struct seq_file *seq, void *v)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001115{
Tetsuo Handa652586d2013-11-14 14:31:57 -08001116 seq_setwidth(seq, 127);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001117 if (v == SEQ_START_TOKEN)
Tetsuo Handa652586d2013-11-14 14:31:57 -08001118 seq_puts(seq, " sl local_address rem_address st tx_queue "
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001119 "rx_queue tr tm->when retrnsmt uid timeout "
1120 "inode ref pointer drops");
1121 else {
1122 struct ping_iter_state *state = seq->private;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001123
Tetsuo Handa652586d2013-11-14 14:31:57 -08001124 ping_v4_format_sock(v, seq, state->bucket);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001125 }
Tetsuo Handa652586d2013-11-14 14:31:57 -08001126 seq_pad(seq, '\n');
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001127 return 0;
1128}
1129
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001130static const struct seq_operations ping_v4_seq_ops = {
1131 .show = ping_v4_seq_show,
1132 .start = ping_v4_seq_start,
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001133 .next = ping_seq_next,
1134 .stop = ping_seq_stop,
1135};
1136
1137static int ping_seq_open(struct inode *inode, struct file *file)
1138{
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001139 struct ping_seq_afinfo *afinfo = PDE_DATA(inode);
1140 return seq_open_net(inode, file, &afinfo->seq_ops,
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001141 sizeof(struct ping_iter_state));
1142}
1143
Lorenzo Colittid862e542013-05-31 15:05:50 +00001144const struct file_operations ping_seq_fops = {
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001145 .open = ping_seq_open,
1146 .read = seq_read,
1147 .llseek = seq_lseek,
1148 .release = seq_release_net,
1149};
Lorenzo Colittid862e542013-05-31 15:05:50 +00001150EXPORT_SYMBOL_GPL(ping_seq_fops);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001151
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001152static struct ping_seq_afinfo ping_v4_seq_afinfo = {
1153 .name = "icmp",
1154 .family = AF_INET,
1155 .seq_fops = &ping_seq_fops,
1156 .seq_ops = {
1157 .start = ping_v4_seq_start,
1158 .show = ping_v4_seq_show,
1159 .next = ping_seq_next,
1160 .stop = ping_seq_stop,
1161 },
1162};
1163
Lorenzo Colittid862e542013-05-31 15:05:50 +00001164int ping_proc_register(struct net *net, struct ping_seq_afinfo *afinfo)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001165{
1166 struct proc_dir_entry *p;
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001167 p = proc_create_data(afinfo->name, S_IRUGO, net->proc_net,
1168 afinfo->seq_fops, afinfo);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001169 if (!p)
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001170 return -ENOMEM;
1171 return 0;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001172}
Lorenzo Colittid862e542013-05-31 15:05:50 +00001173EXPORT_SYMBOL_GPL(ping_proc_register);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001174
Lorenzo Colittid862e542013-05-31 15:05:50 +00001175void ping_proc_unregister(struct net *net, struct ping_seq_afinfo *afinfo)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001176{
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001177 remove_proc_entry(afinfo->name, net->proc_net);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001178}
Lorenzo Colittid862e542013-05-31 15:05:50 +00001179EXPORT_SYMBOL_GPL(ping_proc_unregister);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001180
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001181static int __net_init ping_v4_proc_init_net(struct net *net)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001182{
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001183 return ping_proc_register(net, &ping_v4_seq_afinfo);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001184}
1185
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001186static void __net_exit ping_v4_proc_exit_net(struct net *net)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001187{
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001188 ping_proc_unregister(net, &ping_v4_seq_afinfo);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001189}
1190
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001191static struct pernet_operations ping_v4_net_ops = {
1192 .init = ping_v4_proc_init_net,
1193 .exit = ping_v4_proc_exit_net,
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001194};
1195
1196int __init ping_proc_init(void)
1197{
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001198 return register_pernet_subsys(&ping_v4_net_ops);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001199}
1200
1201void ping_proc_exit(void)
1202{
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001203 unregister_pernet_subsys(&ping_v4_net_ops);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001204}
1205
1206#endif
1207
1208void __init ping_init(void)
1209{
1210 int i;
1211
1212 for (i = 0; i < PING_HTABLE_SIZE; i++)
1213 INIT_HLIST_NULLS_HEAD(&ping_table.hash[i], i);
1214 rwlock_init(&ping_table.lock);
1215}