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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
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +000056
57struct ping_table ping_table;
58struct pingv6_ops pingv6_ops;
59EXPORT_SYMBOL_GPL(pingv6_ops);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +000060
Eric Dumazet1b1cb1f2011-05-13 22:59:19 +000061static u16 ping_port_rover;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +000062
Eric Dumazet95c96172012-04-15 05:58:06 +000063static inline int ping_hashfn(struct net *net, unsigned int num, unsigned int mask)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +000064{
65 int res = (num + net_hash_mix(net)) & mask;
Eric Dumazet95c96172012-04-15 05:58:06 +000066
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +000067 pr_debug("hash(%d) = %d\n", num, res);
68 return res;
69}
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +000070EXPORT_SYMBOL_GPL(ping_hash);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +000071
72static inline struct hlist_nulls_head *ping_hashslot(struct ping_table *table,
Eric Dumazet95c96172012-04-15 05:58:06 +000073 struct net *net, unsigned int num)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +000074{
75 return &table->hash[ping_hashfn(net, num, PING_HTABLE_MASK)];
76}
77
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +000078int ping_get_port(struct sock *sk, unsigned short ident)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +000079{
80 struct hlist_nulls_node *node;
81 struct hlist_nulls_head *hlist;
82 struct inet_sock *isk, *isk2;
83 struct sock *sk2 = NULL;
84
85 isk = inet_sk(sk);
86 write_lock_bh(&ping_table.lock);
87 if (ident == 0) {
88 u32 i;
89 u16 result = ping_port_rover + 1;
90
91 for (i = 0; i < (1L << 16); i++, result++) {
92 if (!result)
93 result++; /* avoid zero */
94 hlist = ping_hashslot(&ping_table, sock_net(sk),
95 result);
96 ping_portaddr_for_each_entry(sk2, node, hlist) {
97 isk2 = inet_sk(sk2);
98
99 if (isk2->inet_num == result)
100 goto next_port;
101 }
102
103 /* found */
104 ping_port_rover = ident = result;
105 break;
106next_port:
107 ;
108 }
109 if (i >= (1L << 16))
110 goto fail;
111 } else {
112 hlist = ping_hashslot(&ping_table, sock_net(sk), ident);
113 ping_portaddr_for_each_entry(sk2, node, hlist) {
114 isk2 = inet_sk(sk2);
115
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000116 /* BUG? Why is this reuse and not reuseaddr? ping.c
117 * doesn't turn off SO_REUSEADDR, and it doesn't expect
118 * that other ping processes can steal its packets.
119 */
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000120 if ((isk2->inet_num == ident) &&
121 (sk2 != sk) &&
122 (!sk2->sk_reuse || !sk->sk_reuse))
123 goto fail;
124 }
125 }
126
127 pr_debug("found port/ident = %d\n", ident);
128 isk->inet_num = ident;
129 if (sk_unhashed(sk)) {
130 pr_debug("was not hashed\n");
131 sock_hold(sk);
132 hlist_nulls_add_head(&sk->sk_nulls_node, hlist);
133 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
134 }
135 write_unlock_bh(&ping_table.lock);
136 return 0;
137
138fail:
139 write_unlock_bh(&ping_table.lock);
140 return 1;
141}
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000142EXPORT_SYMBOL_GPL(ping_get_port);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000143
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000144void ping_hash(struct sock *sk)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000145{
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000146 pr_debug("ping_hash(sk->port=%u)\n", inet_sk(sk)->inet_num);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000147 BUG(); /* "Please do not press this button again." */
148}
149
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000150void ping_unhash(struct sock *sk)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000151{
152 struct inet_sock *isk = inet_sk(sk);
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000153 pr_debug("ping_unhash(isk=%p,isk->num=%u)\n", isk, isk->inet_num);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000154 if (sk_hashed(sk)) {
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000155 write_lock_bh(&ping_table.lock);
156 hlist_nulls_del(&sk->sk_nulls_node);
157 sock_put(sk);
Eric Dumazet747465e2012-01-16 19:27:39 +0000158 isk->inet_num = 0;
159 isk->inet_sport = 0;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000160 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
161 write_unlock_bh(&ping_table.lock);
162 }
163}
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000164EXPORT_SYMBOL_GPL(ping_unhash);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000165
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000166static struct sock *ping_lookup(struct net *net, struct sk_buff *skb, u16 ident)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000167{
168 struct hlist_nulls_head *hslot = ping_hashslot(&ping_table, net, ident);
169 struct sock *sk = NULL;
170 struct inet_sock *isk;
171 struct hlist_nulls_node *hnode;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000172 int dif = skb->dev->ifindex;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000173
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000174 if (skb->protocol == htons(ETH_P_IP)) {
175 pr_debug("try to find: num = %d, daddr = %pI4, dif = %d\n",
176 (int)ident, &ip_hdr(skb)->daddr, dif);
177#if IS_ENABLED(CONFIG_IPV6)
178 } else if (skb->protocol == htons(ETH_P_IPV6)) {
179 pr_debug("try to find: num = %d, daddr = %pI6c, dif = %d\n",
180 (int)ident, &ipv6_hdr(skb)->daddr, dif);
181#endif
182 }
183
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000184 read_lock_bh(&ping_table.lock);
185
186 ping_portaddr_for_each_entry(sk, hnode, hslot) {
187 isk = inet_sk(sk);
188
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000189 pr_debug("iterate\n");
190 if (isk->inet_num != ident)
191 continue;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000192
193 if (skb->protocol == htons(ETH_P_IP) &&
194 sk->sk_family == AF_INET) {
195 pr_debug("found: %p: num=%d, daddr=%pI4, dif=%d\n", sk,
196 (int) isk->inet_num, &isk->inet_rcv_saddr,
197 sk->sk_bound_dev_if);
198
199 if (isk->inet_rcv_saddr &&
200 isk->inet_rcv_saddr != ip_hdr(skb)->daddr)
201 continue;
202#if IS_ENABLED(CONFIG_IPV6)
203 } else if (skb->protocol == htons(ETH_P_IPV6) &&
204 sk->sk_family == AF_INET6) {
205 struct ipv6_pinfo *np = inet6_sk(sk);
206
207 pr_debug("found: %p: num=%d, daddr=%pI6c, dif=%d\n", sk,
208 (int) isk->inet_num,
209 &inet6_sk(sk)->rcv_saddr,
210 sk->sk_bound_dev_if);
211
212 if (!ipv6_addr_any(&np->rcv_saddr) &&
213 !ipv6_addr_equal(&np->rcv_saddr,
214 &ipv6_hdr(skb)->daddr))
215 continue;
216#endif
217 }
218
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000219 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)
220 continue;
221
222 sock_hold(sk);
223 goto exit;
224 }
225
226 sk = NULL;
227exit:
228 read_unlock_bh(&ping_table.lock);
229
230 return sk;
231}
232
Eric W. Biederman7064d162012-05-24 10:34:21 -0600233static void inet_get_ping_group_range_net(struct net *net, kgid_t *low,
234 kgid_t *high)
Vasiliy Kulikovf56e03e2011-05-17 00:16:56 +0000235{
Eric W. Biederman7064d162012-05-24 10:34:21 -0600236 kgid_t *data = net->ipv4.sysctl_ping_group_range;
Eric Dumazet95c96172012-04-15 05:58:06 +0000237 unsigned int seq;
238
Vasiliy Kulikovf56e03e2011-05-17 00:16:56 +0000239 do {
240 seq = read_seqbegin(&sysctl_local_ports.lock);
241
242 *low = data[0];
243 *high = data[1];
244 } while (read_seqretry(&sysctl_local_ports.lock, seq));
245}
246
247
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000248int ping_init_sock(struct sock *sk)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000249{
250 struct net *net = sock_net(sk);
Eric W. Biederman7064d162012-05-24 10:34:21 -0600251 kgid_t group = current_egid();
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000252 struct group_info *group_info = get_current_groups();
253 int i, j, count = group_info->ngroups;
Eric W. Biedermanae2975b2011-11-14 15:56:38 -0800254 kgid_t low, high;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000255
Eric W. Biederman7064d162012-05-24 10:34:21 -0600256 inet_get_ping_group_range_net(net, &low, &high);
257 if (gid_lte(low, group) && gid_lte(group, high))
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000258 return 0;
259
260 for (i = 0; i < group_info->nblocks; i++) {
261 int cp_count = min_t(int, NGROUPS_PER_BLOCK, count);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000262 for (j = 0; j < cp_count; j++) {
Eric W. Biedermanae2975b2011-11-14 15:56:38 -0800263 kgid_t gid = group_info->blocks[i][j];
264 if (gid_lte(low, gid) && gid_lte(gid, high))
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000265 return 0;
266 }
267
268 count -= cp_count;
269 }
270
271 return -EACCES;
272}
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000273EXPORT_SYMBOL_GPL(ping_init_sock);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000274
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000275void ping_close(struct sock *sk, long timeout)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000276{
277 pr_debug("ping_close(sk=%p,sk->num=%u)\n",
Joe Perches058bd4d2012-03-11 18:36:11 +0000278 inet_sk(sk), inet_sk(sk)->inet_num);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000279 pr_debug("isk->refcnt = %d\n", sk->sk_refcnt.counter);
280
281 sk_common_release(sk);
282}
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000283EXPORT_SYMBOL_GPL(ping_close);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000284
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000285/* Checks the bind address and possibly modifies sk->sk_bound_dev_if. */
Wu Fengguanga06a2d32013-06-12 21:04:16 +0800286static int ping_check_bind_addr(struct sock *sk, struct inet_sock *isk,
287 struct sockaddr *uaddr, int addr_len) {
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000288 struct net *net = sock_net(sk);
289 if (sk->sk_family == AF_INET) {
290 struct sockaddr_in *addr = (struct sockaddr_in *) uaddr;
291 int chk_addr_ret;
292
293 if (addr_len < sizeof(*addr))
294 return -EINVAL;
295
296 pr_debug("ping_check_bind_addr(sk=%p,addr=%pI4,port=%d)\n",
297 sk, &addr->sin_addr.s_addr, ntohs(addr->sin_port));
298
299 chk_addr_ret = inet_addr_type(net, addr->sin_addr.s_addr);
300
301 if (addr->sin_addr.s_addr == htonl(INADDR_ANY))
302 chk_addr_ret = RTN_LOCAL;
303
304 if ((sysctl_ip_nonlocal_bind == 0 &&
305 isk->freebind == 0 && isk->transparent == 0 &&
306 chk_addr_ret != RTN_LOCAL) ||
307 chk_addr_ret == RTN_MULTICAST ||
308 chk_addr_ret == RTN_BROADCAST)
309 return -EADDRNOTAVAIL;
310
311#if IS_ENABLED(CONFIG_IPV6)
312 } else if (sk->sk_family == AF_INET6) {
313 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr;
314 int addr_type, scoped, has_addr;
315 struct net_device *dev = NULL;
316
317 if (addr_len < sizeof(*addr))
318 return -EINVAL;
319
320 pr_debug("ping_check_bind_addr(sk=%p,addr=%pI6c,port=%d)\n",
321 sk, addr->sin6_addr.s6_addr, ntohs(addr->sin6_port));
322
323 addr_type = ipv6_addr_type(&addr->sin6_addr);
324 scoped = __ipv6_addr_needs_scope_id(addr_type);
325 if ((addr_type != IPV6_ADDR_ANY &&
326 !(addr_type & IPV6_ADDR_UNICAST)) ||
327 (scoped && !addr->sin6_scope_id))
328 return -EINVAL;
329
330 rcu_read_lock();
331 if (addr->sin6_scope_id) {
332 dev = dev_get_by_index_rcu(net, addr->sin6_scope_id);
333 if (!dev) {
334 rcu_read_unlock();
335 return -ENODEV;
336 }
337 }
338 has_addr = pingv6_ops.ipv6_chk_addr(net, &addr->sin6_addr, dev,
339 scoped);
340 rcu_read_unlock();
341
342 if (!(isk->freebind || isk->transparent || has_addr ||
343 addr_type == IPV6_ADDR_ANY))
344 return -EADDRNOTAVAIL;
345
346 if (scoped)
347 sk->sk_bound_dev_if = addr->sin6_scope_id;
348#endif
349 } else {
350 return -EAFNOSUPPORT;
351 }
352 return 0;
353}
354
Wu Fengguanga06a2d32013-06-12 21:04:16 +0800355static void ping_set_saddr(struct sock *sk, struct sockaddr *saddr)
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000356{
357 if (saddr->sa_family == AF_INET) {
358 struct inet_sock *isk = inet_sk(sk);
359 struct sockaddr_in *addr = (struct sockaddr_in *) saddr;
360 isk->inet_rcv_saddr = isk->inet_saddr = addr->sin_addr.s_addr;
361#if IS_ENABLED(CONFIG_IPV6)
362 } else if (saddr->sa_family == AF_INET6) {
363 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) saddr;
364 struct ipv6_pinfo *np = inet6_sk(sk);
365 np->rcv_saddr = np->saddr = addr->sin6_addr;
366#endif
367 }
368}
369
Wu Fengguanga06a2d32013-06-12 21:04:16 +0800370static void ping_clear_saddr(struct sock *sk, int dif)
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000371{
372 sk->sk_bound_dev_if = dif;
373 if (sk->sk_family == AF_INET) {
374 struct inet_sock *isk = inet_sk(sk);
375 isk->inet_rcv_saddr = isk->inet_saddr = 0;
376#if IS_ENABLED(CONFIG_IPV6)
377 } else if (sk->sk_family == AF_INET6) {
378 struct ipv6_pinfo *np = inet6_sk(sk);
379 memset(&np->rcv_saddr, 0, sizeof(np->rcv_saddr));
380 memset(&np->saddr, 0, sizeof(np->saddr));
381#endif
382 }
383}
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000384/*
385 * We need our own bind because there are no privileged id's == local ports.
386 * Moreover, we don't allow binding to multi- and broadcast addresses.
387 */
388
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000389int ping_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000390{
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000391 struct inet_sock *isk = inet_sk(sk);
392 unsigned short snum;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000393 int err;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000394 int dif = sk->sk_bound_dev_if;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000395
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000396 err = ping_check_bind_addr(sk, isk, uaddr, addr_len);
397 if (err)
398 return err;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000399
400 lock_sock(sk);
401
402 err = -EINVAL;
403 if (isk->inet_num != 0)
404 goto out;
405
406 err = -EADDRINUSE;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000407 ping_set_saddr(sk, uaddr);
408 snum = ntohs(((struct sockaddr_in *)uaddr)->sin_port);
409 if (ping_get_port(sk, snum) != 0) {
410 ping_clear_saddr(sk, dif);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000411 goto out;
412 }
413
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000414 pr_debug("after bind(): num = %d, dif = %d\n",
Joe Perches058bd4d2012-03-11 18:36:11 +0000415 (int)isk->inet_num,
Joe Perches058bd4d2012-03-11 18:36:11 +0000416 (int)sk->sk_bound_dev_if);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000417
418 err = 0;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000419 if ((sk->sk_family == AF_INET && isk->inet_rcv_saddr) ||
420 (sk->sk_family == AF_INET6 &&
421 !ipv6_addr_any(&inet6_sk(sk)->rcv_saddr)))
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000422 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000423
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000424 if (snum)
425 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
426 isk->inet_sport = htons(isk->inet_num);
427 isk->inet_daddr = 0;
428 isk->inet_dport = 0;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000429
430#if IS_ENABLED(CONFIG_IPV6)
431 if (sk->sk_family == AF_INET6)
432 memset(&inet6_sk(sk)->daddr, 0, sizeof(inet6_sk(sk)->daddr));
433#endif
434
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000435 sk_dst_reset(sk);
436out:
437 release_sock(sk);
438 pr_debug("ping_v4_bind -> %d\n", err);
439 return err;
440}
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000441EXPORT_SYMBOL_GPL(ping_bind);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000442
443/*
444 * Is this a supported type of ICMP message?
445 */
446
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000447static inline int ping_supported(int family, int type, int code)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000448{
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000449 return (family == AF_INET && type == ICMP_ECHO && code == 0) ||
450 (family == AF_INET6 && type == ICMPV6_ECHO_REQUEST && code == 0);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000451}
452
453/*
454 * This routine is called by the ICMP module when it gets some
455 * sort of error condition.
456 */
457
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000458void ping_err(struct sk_buff *skb, int offset, u32 info)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000459{
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000460 int family;
461 struct icmphdr *icmph;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000462 struct inet_sock *inet_sock;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000463 int type;
464 int code;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000465 struct net *net = dev_net(skb->dev);
466 struct sock *sk;
467 int harderr;
468 int err;
469
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000470 if (skb->protocol == htons(ETH_P_IP)) {
471 family = AF_INET;
472 type = icmp_hdr(skb)->type;
473 code = icmp_hdr(skb)->code;
474 icmph = (struct icmphdr *)(skb->data + offset);
475 } else if (skb->protocol == htons(ETH_P_IPV6)) {
476 family = AF_INET6;
477 type = icmp6_hdr(skb)->icmp6_type;
478 code = icmp6_hdr(skb)->icmp6_code;
479 icmph = (struct icmphdr *) (skb->data + offset);
480 } else {
481 BUG();
482 }
483
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000484 /* We assume the packet has already been checked by icmp_unreach */
485
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000486 if (!ping_supported(family, icmph->type, icmph->code))
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000487 return;
488
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000489 pr_debug("ping_err(proto=0x%x,type=%d,code=%d,id=%04x,seq=%04x)\n",
490 skb->protocol, type, code, ntohs(icmph->un.echo.id),
491 ntohs(icmph->un.echo.sequence));
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000492
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000493 sk = ping_lookup(net, skb, ntohs(icmph->un.echo.id));
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000494 if (sk == NULL) {
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000495 pr_debug("no socket, dropping\n");
496 return; /* No socket for error */
497 }
498 pr_debug("err on socket %p\n", sk);
499
500 err = 0;
501 harderr = 0;
502 inet_sock = inet_sk(sk);
503
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000504 if (skb->protocol == htons(ETH_P_IP)) {
505 switch (type) {
506 default:
507 case ICMP_TIME_EXCEEDED:
508 err = EHOSTUNREACH;
509 break;
510 case ICMP_SOURCE_QUENCH:
511 /* This is not a real error but ping wants to see it.
512 * Report it with some fake errno.
513 */
514 err = EREMOTEIO;
515 break;
516 case ICMP_PARAMETERPROB:
517 err = EPROTO;
518 harderr = 1;
519 break;
520 case ICMP_DEST_UNREACH:
521 if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */
522 ipv4_sk_update_pmtu(skb, sk, info);
523 if (inet_sock->pmtudisc != IP_PMTUDISC_DONT) {
524 err = EMSGSIZE;
525 harderr = 1;
526 break;
527 }
528 goto out;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000529 }
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000530 err = EHOSTUNREACH;
531 if (code <= NR_ICMP_UNREACH) {
532 harderr = icmp_err_convert[code].fatal;
533 err = icmp_err_convert[code].errno;
534 }
535 break;
536 case ICMP_REDIRECT:
537 /* See ICMP_SOURCE_QUENCH */
538 ipv4_sk_redirect(skb, sk);
539 err = EREMOTEIO;
540 break;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000541 }
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000542#if IS_ENABLED(CONFIG_IPV6)
543 } else if (skb->protocol == htons(ETH_P_IPV6)) {
544 harderr = pingv6_ops.icmpv6_err_convert(type, code, &err);
545#endif
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000546 }
547
548 /*
549 * RFC1122: OK. Passes ICMP errors back to application, as per
550 * 4.1.3.3.
551 */
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000552 if ((family == AF_INET && !inet_sock->recverr) ||
553 (family == AF_INET6 && !inet6_sk(sk)->recverr)) {
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000554 if (!harderr || sk->sk_state != TCP_ESTABLISHED)
555 goto out;
556 } else {
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000557 if (family == AF_INET) {
558 ip_icmp_error(sk, skb, err, 0 /* no remote port */,
559 info, (u8 *)icmph);
560#if IS_ENABLED(CONFIG_IPV6)
561 } else if (family == AF_INET6) {
562 pingv6_ops.ipv6_icmp_error(sk, skb, err, 0,
563 info, (u8 *)icmph);
564#endif
565 }
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000566 }
567 sk->sk_err = err;
568 sk->sk_error_report(sk);
569out:
570 sock_put(sk);
571}
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000572EXPORT_SYMBOL_GPL(ping_err);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000573
574/*
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000575 * Copy and checksum an ICMP Echo packet from user space into a buffer
576 * starting from the payload.
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000577 */
578
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000579int ping_getfrag(void *from, char *to,
580 int offset, int fraglen, int odd, struct sk_buff *skb)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000581{
582 struct pingfakehdr *pfh = (struct pingfakehdr *)from;
583
584 if (offset == 0) {
585 if (fraglen < sizeof(struct icmphdr))
586 BUG();
587 if (csum_partial_copy_fromiovecend(to + sizeof(struct icmphdr),
588 pfh->iov, 0, fraglen - sizeof(struct icmphdr),
589 &pfh->wcheck))
590 return -EFAULT;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000591 } else if (offset < sizeof(struct icmphdr)) {
592 BUG();
593 } else {
594 if (csum_partial_copy_fromiovecend
595 (to, pfh->iov, offset - sizeof(struct icmphdr),
596 fraglen, &pfh->wcheck))
597 return -EFAULT;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000598 }
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000599
600#if IS_ENABLED(CONFIG_IPV6)
601 /* For IPv6, checksum each skb as we go along, as expected by
602 * icmpv6_push_pending_frames. For IPv4, accumulate the checksum in
603 * wcheck, it will be finalized in ping_v4_push_pending_frames.
604 */
605 if (pfh->family == AF_INET6) {
606 skb->csum = pfh->wcheck;
607 skb->ip_summed = CHECKSUM_NONE;
608 pfh->wcheck = 0;
609 }
610#endif
611
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000612 return 0;
613}
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000614EXPORT_SYMBOL_GPL(ping_getfrag);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000615
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000616static int ping_v4_push_pending_frames(struct sock *sk, struct pingfakehdr *pfh,
617 struct flowi4 *fl4)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000618{
619 struct sk_buff *skb = skb_peek(&sk->sk_write_queue);
620
621 pfh->wcheck = csum_partial((char *)&pfh->icmph,
622 sizeof(struct icmphdr), pfh->wcheck);
623 pfh->icmph.checksum = csum_fold(pfh->wcheck);
624 memcpy(icmp_hdr(skb), &pfh->icmph, sizeof(struct icmphdr));
625 skb->ip_summed = CHECKSUM_NONE;
626 return ip_push_pending_frames(sk, fl4);
627}
628
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000629int ping_common_sendmsg(int family, struct msghdr *msg, size_t len,
630 void *user_icmph, size_t icmph_len) {
631 u8 type, code;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000632
633 if (len > 0xFFFF)
634 return -EMSGSIZE;
635
636 /*
637 * Check the flags.
638 */
639
640 /* Mirror BSD error message compatibility */
641 if (msg->msg_flags & MSG_OOB)
642 return -EOPNOTSUPP;
643
644 /*
645 * Fetch the ICMP header provided by the userland.
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000646 * iovec is modified! The ICMP header is consumed.
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000647 */
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000648 if (memcpy_fromiovec(user_icmph, msg->msg_iov, icmph_len))
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000649 return -EFAULT;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000650
651 if (family == AF_INET) {
652 type = ((struct icmphdr *) user_icmph)->type;
653 code = ((struct icmphdr *) user_icmph)->code;
654#if IS_ENABLED(CONFIG_IPV6)
655 } else if (family == AF_INET6) {
656 type = ((struct icmp6hdr *) user_icmph)->icmp6_type;
657 code = ((struct icmp6hdr *) user_icmph)->icmp6_code;
658#endif
659 } else {
660 BUG();
661 }
662
663 if (!ping_supported(family, type, code))
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000664 return -EINVAL;
665
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000666 return 0;
667}
668EXPORT_SYMBOL_GPL(ping_common_sendmsg);
669
670int ping_v4_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
671 size_t len)
672{
673 struct net *net = sock_net(sk);
674 struct flowi4 fl4;
675 struct inet_sock *inet = inet_sk(sk);
676 struct ipcm_cookie ipc;
677 struct icmphdr user_icmph;
678 struct pingfakehdr pfh;
679 struct rtable *rt = NULL;
680 struct ip_options_data opt_copy;
681 int free = 0;
682 __be32 saddr, daddr, faddr;
683 u8 tos;
684 int err;
685
686 pr_debug("ping_v4_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num);
687
688 err = ping_common_sendmsg(AF_INET, msg, len, &user_icmph,
689 sizeof(user_icmph));
690 if (err)
691 return err;
692
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000693 /*
694 * Get and verify the address.
695 */
696
697 if (msg->msg_name) {
698 struct sockaddr_in *usin = (struct sockaddr_in *)msg->msg_name;
699 if (msg->msg_namelen < sizeof(*usin))
700 return -EINVAL;
701 if (usin->sin_family != AF_INET)
702 return -EINVAL;
703 daddr = usin->sin_addr.s_addr;
704 /* no remote port */
705 } else {
706 if (sk->sk_state != TCP_ESTABLISHED)
707 return -EDESTADDRREQ;
708 daddr = inet->inet_daddr;
709 /* no remote port */
710 }
711
712 ipc.addr = inet->inet_saddr;
713 ipc.opt = NULL;
714 ipc.oif = sk->sk_bound_dev_if;
715 ipc.tx_flags = 0;
Daniel Borkmannbf84a012013-04-14 08:08:13 +0000716
717 sock_tx_timestamp(sk, &ipc.tx_flags);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000718
719 if (msg->msg_controllen) {
720 err = ip_cmsg_send(sock_net(sk), msg, &ipc);
721 if (err)
722 return err;
723 if (ipc.opt)
724 free = 1;
725 }
726 if (!ipc.opt) {
727 struct ip_options_rcu *inet_opt;
728
729 rcu_read_lock();
730 inet_opt = rcu_dereference(inet->inet_opt);
731 if (inet_opt) {
732 memcpy(&opt_copy, inet_opt,
733 sizeof(*inet_opt) + inet_opt->opt.optlen);
734 ipc.opt = &opt_copy.opt;
735 }
736 rcu_read_unlock();
737 }
738
739 saddr = ipc.addr;
740 ipc.addr = faddr = daddr;
741
742 if (ipc.opt && ipc.opt->opt.srr) {
743 if (!daddr)
744 return -EINVAL;
745 faddr = ipc.opt->opt.faddr;
746 }
747 tos = RT_TOS(inet->tos);
748 if (sock_flag(sk, SOCK_LOCALROUTE) ||
749 (msg->msg_flags & MSG_DONTROUTE) ||
750 (ipc.opt && ipc.opt->opt.is_strictroute)) {
751 tos |= RTO_ONLINK;
752 }
753
754 if (ipv4_is_multicast(daddr)) {
755 if (!ipc.oif)
756 ipc.oif = inet->mc_index;
757 if (!saddr)
758 saddr = inet->mc_addr;
Erich E. Hoover76e21052012-02-08 09:11:07 +0000759 } else if (!ipc.oif)
760 ipc.oif = inet->uc_index;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000761
762 flowi4_init_output(&fl4, ipc.oif, sk->sk_mark, tos,
763 RT_SCOPE_UNIVERSE, sk->sk_protocol,
764 inet_sk_flowi_flags(sk), faddr, saddr, 0, 0);
765
766 security_sk_classify_flow(sk, flowi4_to_flowi(&fl4));
767 rt = ip_route_output_flow(net, &fl4, sk);
768 if (IS_ERR(rt)) {
769 err = PTR_ERR(rt);
770 rt = NULL;
771 if (err == -ENETUNREACH)
772 IP_INC_STATS_BH(net, IPSTATS_MIB_OUTNOROUTES);
773 goto out;
774 }
775
776 err = -EACCES;
777 if ((rt->rt_flags & RTCF_BROADCAST) &&
778 !sock_flag(sk, SOCK_BROADCAST))
779 goto out;
780
781 if (msg->msg_flags & MSG_CONFIRM)
782 goto do_confirm;
783back_from_confirm:
784
785 if (!ipc.addr)
786 ipc.addr = fl4.daddr;
787
788 lock_sock(sk);
789
790 pfh.icmph.type = user_icmph.type; /* already checked */
791 pfh.icmph.code = user_icmph.code; /* ditto */
792 pfh.icmph.checksum = 0;
793 pfh.icmph.un.echo.id = inet->inet_sport;
794 pfh.icmph.un.echo.sequence = user_icmph.un.echo.sequence;
795 pfh.iov = msg->msg_iov;
796 pfh.wcheck = 0;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000797 pfh.family = AF_INET;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000798
799 err = ip_append_data(sk, &fl4, ping_getfrag, &pfh, len,
800 0, &ipc, &rt, msg->msg_flags);
801 if (err)
802 ip_flush_pending_frames(sk);
803 else
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000804 err = ping_v4_push_pending_frames(sk, &pfh, &fl4);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000805 release_sock(sk);
806
807out:
808 ip_rt_put(rt);
809 if (free)
810 kfree(ipc.opt);
811 if (!err) {
812 icmp_out_count(sock_net(sk), user_icmph.type);
813 return len;
814 }
815 return err;
816
817do_confirm:
818 dst_confirm(&rt->dst);
819 if (!(msg->msg_flags & MSG_PROBE) || len)
820 goto back_from_confirm;
821 err = 0;
822 goto out;
823}
824
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000825int ping_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
826 size_t len, int noblock, int flags, int *addr_len)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000827{
828 struct inet_sock *isk = inet_sk(sk);
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000829 int family = sk->sk_family;
830 struct sockaddr_in *sin;
831 struct sockaddr_in6 *sin6;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000832 struct sk_buff *skb;
833 int copied, err;
834
835 pr_debug("ping_recvmsg(sk=%p,sk->num=%u)\n", isk, isk->inet_num);
836
David S. Millera5e74242012-02-21 17:59:19 -0500837 err = -EOPNOTSUPP;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000838 if (flags & MSG_OOB)
839 goto out;
840
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000841 if (addr_len) {
842 if (family == AF_INET)
843 *addr_len = sizeof(*sin);
844 else if (family == AF_INET6 && addr_len)
845 *addr_len = sizeof(*sin6);
846 }
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000847
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000848 if (flags & MSG_ERRQUEUE) {
849 if (family == AF_INET) {
850 return ip_recv_error(sk, msg, len);
851#if IS_ENABLED(CONFIG_IPV6)
852 } else if (family == AF_INET6) {
853 return pingv6_ops.ipv6_recv_error(sk, msg, len);
854#endif
855 }
856 }
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000857
858 skb = skb_recv_datagram(sk, flags, noblock, &err);
859 if (!skb)
860 goto out;
861
862 copied = skb->len;
863 if (copied > len) {
864 msg->msg_flags |= MSG_TRUNC;
865 copied = len;
866 }
867
868 /* Don't bother checking the checksum */
869 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
870 if (err)
871 goto done;
872
873 sock_recv_timestamp(msg, sk, skb);
874
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000875 /* Copy the address and add cmsg data. */
876 if (family == AF_INET) {
877 sin = (struct sockaddr_in *) msg->msg_name;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000878 sin->sin_family = AF_INET;
879 sin->sin_port = 0 /* skb->h.uh->source */;
880 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
881 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000882
883 if (isk->cmsg_flags)
884 ip_cmsg_recv(msg, skb);
885
886#if IS_ENABLED(CONFIG_IPV6)
887 } else if (family == AF_INET6) {
888 struct ipv6_pinfo *np = inet6_sk(sk);
889 struct ipv6hdr *ip6 = ipv6_hdr(skb);
890 sin6 = (struct sockaddr_in6 *) msg->msg_name;
891 sin6->sin6_family = AF_INET6;
892 sin6->sin6_port = 0;
893 sin6->sin6_addr = ip6->saddr;
894
Cong Wangc26d6b42013-06-02 22:43:52 +0000895 sin6->sin6_flowinfo = 0;
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000896 if (np->sndflow)
897 sin6->sin6_flowinfo = ip6_flowinfo(ip6);
898
Cong Wangc26d6b42013-06-02 22:43:52 +0000899 sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr,
900 IP6CB(skb)->iif);
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000901
902 if (inet6_sk(sk)->rxopt.all)
903 pingv6_ops.ip6_datagram_recv_ctl(sk, msg, skb);
904#endif
905 } else {
906 BUG();
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000907 }
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000908
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000909 err = copied;
910
911done:
912 skb_free_datagram(sk, skb);
913out:
914 pr_debug("ping_recvmsg -> %d\n", err);
915 return err;
916}
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000917EXPORT_SYMBOL_GPL(ping_recvmsg);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000918
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000919int ping_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000920{
921 pr_debug("ping_queue_rcv_skb(sk=%p,sk->num=%d,skb=%p)\n",
Joe Perches058bd4d2012-03-11 18:36:11 +0000922 inet_sk(sk), inet_sk(sk)->inet_num, skb);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000923 if (sock_queue_rcv_skb(sk, skb) < 0) {
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000924 kfree_skb(skb);
925 pr_debug("ping_queue_rcv_skb -> failed\n");
926 return -1;
927 }
928 return 0;
929}
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000930EXPORT_SYMBOL_GPL(ping_queue_rcv_skb);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000931
932
933/*
934 * All we need to do is get the socket.
935 */
936
937void ping_rcv(struct sk_buff *skb)
938{
939 struct sock *sk;
940 struct net *net = dev_net(skb->dev);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000941 struct icmphdr *icmph = icmp_hdr(skb);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000942
943 /* We assume the packet has already been checked by icmp_rcv */
944
945 pr_debug("ping_rcv(skb=%p,id=%04x,seq=%04x)\n",
Joe Perches058bd4d2012-03-11 18:36:11 +0000946 skb, ntohs(icmph->un.echo.id), ntohs(icmph->un.echo.sequence));
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000947
948 /* Push ICMP header back */
949 skb_push(skb, skb->data - (u8 *)icmph);
950
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000951 sk = ping_lookup(net, skb, ntohs(icmph->un.echo.id));
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000952 if (sk != NULL) {
953 pr_debug("rcv on socket %p\n", sk);
954 ping_queue_rcv_skb(sk, skb_get(skb));
955 sock_put(sk);
956 return;
957 }
958 pr_debug("no socket, dropping\n");
959
960 /* We're called from icmp_rcv(). kfree_skb() is done there. */
961}
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000962EXPORT_SYMBOL_GPL(ping_rcv);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000963
964struct proto ping_prot = {
965 .name = "PING",
966 .owner = THIS_MODULE,
967 .init = ping_init_sock,
968 .close = ping_close,
969 .connect = ip4_datagram_connect,
970 .disconnect = udp_disconnect,
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000971 .setsockopt = ip_setsockopt,
972 .getsockopt = ip_getsockopt,
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000973 .sendmsg = ping_v4_sendmsg,
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000974 .recvmsg = ping_recvmsg,
975 .bind = ping_bind,
976 .backlog_rcv = ping_queue_rcv_skb,
Steffen Klassert8141ed92013-01-21 02:00:03 +0000977 .release_cb = ip4_datagram_release_cb,
Lorenzo Colitti6d0bfe22013-05-22 20:17:31 +0000978 .hash = ping_hash,
979 .unhash = ping_unhash,
980 .get_port = ping_get_port,
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000981 .obj_size = sizeof(struct inet_sock),
982};
983EXPORT_SYMBOL(ping_prot);
984
985#ifdef CONFIG_PROC_FS
986
987static struct sock *ping_get_first(struct seq_file *seq, int start)
988{
989 struct sock *sk;
990 struct ping_iter_state *state = seq->private;
991 struct net *net = seq_file_net(seq);
992
993 for (state->bucket = start; state->bucket < PING_HTABLE_SIZE;
994 ++state->bucket) {
995 struct hlist_nulls_node *node;
Changli Gao75e308c2011-05-18 21:16:01 +0000996 struct hlist_nulls_head *hslot;
997
998 hslot = &ping_table.hash[state->bucket];
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +0000999
1000 if (hlist_nulls_empty(hslot))
1001 continue;
1002
1003 sk_nulls_for_each(sk, node, hslot) {
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001004 if (net_eq(sock_net(sk), net) &&
1005 sk->sk_family == state->family)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001006 goto found;
1007 }
1008 }
1009 sk = NULL;
1010found:
1011 return sk;
1012}
1013
1014static struct sock *ping_get_next(struct seq_file *seq, struct sock *sk)
1015{
1016 struct ping_iter_state *state = seq->private;
1017 struct net *net = seq_file_net(seq);
1018
1019 do {
1020 sk = sk_nulls_next(sk);
1021 } while (sk && (!net_eq(sock_net(sk), net)));
1022
1023 if (!sk)
1024 return ping_get_first(seq, state->bucket + 1);
1025 return sk;
1026}
1027
1028static struct sock *ping_get_idx(struct seq_file *seq, loff_t pos)
1029{
1030 struct sock *sk = ping_get_first(seq, 0);
1031
1032 if (sk)
1033 while (pos && (sk = ping_get_next(seq, sk)) != NULL)
1034 --pos;
1035 return pos ? NULL : sk;
1036}
1037
Lorenzo Colittid862e542013-05-31 15:05:50 +00001038void *ping_seq_start(struct seq_file *seq, loff_t *pos, sa_family_t family)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001039{
1040 struct ping_iter_state *state = seq->private;
1041 state->bucket = 0;
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001042 state->family = family;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001043
1044 read_lock_bh(&ping_table.lock);
1045
1046 return *pos ? ping_get_idx(seq, *pos-1) : SEQ_START_TOKEN;
1047}
Lorenzo Colittid862e542013-05-31 15:05:50 +00001048EXPORT_SYMBOL_GPL(ping_seq_start);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001049
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001050static void *ping_v4_seq_start(struct seq_file *seq, loff_t *pos)
1051{
1052 return ping_seq_start(seq, pos, AF_INET);
1053}
1054
Lorenzo Colittid862e542013-05-31 15:05:50 +00001055void *ping_seq_next(struct seq_file *seq, void *v, loff_t *pos)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001056{
1057 struct sock *sk;
1058
1059 if (v == SEQ_START_TOKEN)
1060 sk = ping_get_idx(seq, 0);
1061 else
1062 sk = ping_get_next(seq, v);
1063
1064 ++*pos;
1065 return sk;
1066}
Lorenzo Colittid862e542013-05-31 15:05:50 +00001067EXPORT_SYMBOL_GPL(ping_seq_next);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001068
Lorenzo Colittid862e542013-05-31 15:05:50 +00001069void ping_seq_stop(struct seq_file *seq, void *v)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001070{
1071 read_unlock_bh(&ping_table.lock);
1072}
Lorenzo Colittid862e542013-05-31 15:05:50 +00001073EXPORT_SYMBOL_GPL(ping_seq_stop);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001074
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001075static void ping_v4_format_sock(struct sock *sp, struct seq_file *f,
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001076 int bucket, int *len)
1077{
1078 struct inet_sock *inet = inet_sk(sp);
1079 __be32 dest = inet->inet_daddr;
1080 __be32 src = inet->inet_rcv_saddr;
1081 __u16 destp = ntohs(inet->inet_dport);
1082 __u16 srcp = ntohs(inet->inet_sport);
1083
1084 seq_printf(f, "%5d: %08X:%04X %08X:%04X"
Francesco Fuscod14c5ab2013-08-15 13:42:14 +02001085 " %02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d%n",
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001086 bucket, src, srcp, dest, destp, sp->sk_state,
1087 sk_wmem_alloc_get(sp),
1088 sk_rmem_alloc_get(sp),
Eric W. Biedermana7cb5a42012-05-24 01:10:10 -06001089 0, 0L, 0,
1090 from_kuid_munged(seq_user_ns(f), sock_i_uid(sp)),
1091 0, sock_i_ino(sp),
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001092 atomic_read(&sp->sk_refcnt), sp,
1093 atomic_read(&sp->sk_drops), len);
1094}
1095
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001096static int ping_v4_seq_show(struct seq_file *seq, void *v)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001097{
1098 if (v == SEQ_START_TOKEN)
1099 seq_printf(seq, "%-127s\n",
1100 " sl local_address rem_address st tx_queue "
1101 "rx_queue tr tm->when retrnsmt uid timeout "
1102 "inode ref pointer drops");
1103 else {
1104 struct ping_iter_state *state = seq->private;
1105 int len;
1106
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001107 ping_v4_format_sock(v, seq, state->bucket, &len);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001108 seq_printf(seq, "%*s\n", 127 - len, "");
1109 }
1110 return 0;
1111}
1112
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001113static const struct seq_operations ping_v4_seq_ops = {
1114 .show = ping_v4_seq_show,
1115 .start = ping_v4_seq_start,
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001116 .next = ping_seq_next,
1117 .stop = ping_seq_stop,
1118};
1119
1120static int ping_seq_open(struct inode *inode, struct file *file)
1121{
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001122 struct ping_seq_afinfo *afinfo = PDE_DATA(inode);
1123 return seq_open_net(inode, file, &afinfo->seq_ops,
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001124 sizeof(struct ping_iter_state));
1125}
1126
Lorenzo Colittid862e542013-05-31 15:05:50 +00001127const struct file_operations ping_seq_fops = {
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001128 .open = ping_seq_open,
1129 .read = seq_read,
1130 .llseek = seq_lseek,
1131 .release = seq_release_net,
1132};
Lorenzo Colittid862e542013-05-31 15:05:50 +00001133EXPORT_SYMBOL_GPL(ping_seq_fops);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001134
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001135static struct ping_seq_afinfo ping_v4_seq_afinfo = {
1136 .name = "icmp",
1137 .family = AF_INET,
1138 .seq_fops = &ping_seq_fops,
1139 .seq_ops = {
1140 .start = ping_v4_seq_start,
1141 .show = ping_v4_seq_show,
1142 .next = ping_seq_next,
1143 .stop = ping_seq_stop,
1144 },
1145};
1146
Lorenzo Colittid862e542013-05-31 15:05:50 +00001147int ping_proc_register(struct net *net, struct ping_seq_afinfo *afinfo)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001148{
1149 struct proc_dir_entry *p;
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001150 p = proc_create_data(afinfo->name, S_IRUGO, net->proc_net,
1151 afinfo->seq_fops, afinfo);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001152 if (!p)
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001153 return -ENOMEM;
1154 return 0;
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001155}
Lorenzo Colittid862e542013-05-31 15:05:50 +00001156EXPORT_SYMBOL_GPL(ping_proc_register);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001157
Lorenzo Colittid862e542013-05-31 15:05:50 +00001158void ping_proc_unregister(struct net *net, struct ping_seq_afinfo *afinfo)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001159{
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001160 remove_proc_entry(afinfo->name, net->proc_net);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001161}
Lorenzo Colittid862e542013-05-31 15:05:50 +00001162EXPORT_SYMBOL_GPL(ping_proc_unregister);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001163
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001164static int __net_init ping_v4_proc_init_net(struct net *net)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001165{
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001166 return ping_proc_register(net, &ping_v4_seq_afinfo);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001167}
1168
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001169static void __net_exit ping_v4_proc_exit_net(struct net *net)
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001170{
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001171 ping_proc_unregister(net, &ping_v4_seq_afinfo);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001172}
1173
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001174static struct pernet_operations ping_v4_net_ops = {
1175 .init = ping_v4_proc_init_net,
1176 .exit = ping_v4_proc_exit_net,
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001177};
1178
1179int __init ping_proc_init(void)
1180{
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001181 return register_pernet_subsys(&ping_v4_net_ops);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001182}
1183
1184void ping_proc_exit(void)
1185{
Lorenzo Colitti8cc785f2013-05-31 15:05:49 +00001186 unregister_pernet_subsys(&ping_v4_net_ops);
Vasiliy Kulikovc319b4d2011-05-13 10:01:00 +00001187}
1188
1189#endif
1190
1191void __init ping_init(void)
1192{
1193 int i;
1194
1195 for (i = 0; i < PING_HTABLE_SIZE; i++)
1196 INIT_HLIST_NULLS_HEAD(&ping_table.hash[i], i);
1197 rwlock_init(&ping_table.lock);
1198}