Commit | Line | Data |
---|---|---|
c319b4d7 VK |
1 | /* |
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 | ||
c319b4d7 | 23 | #include <linux/uaccess.h> |
c319b4d7 VK |
24 | #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> | |
c319b4d7 VK |
36 | #include <net/icmp.h> |
37 | #include <net/protocol.h> | |
38 | #include <linux/skbuff.h> | |
39 | #include <linux/proc_fs.h> | |
bc3b2d7f | 40 | #include <linux/export.h> |
c319b4d7 VK |
41 | #include <net/sock.h> |
42 | #include <net/ping.h> | |
c319b4d7 VK |
43 | #include <net/udp.h> |
44 | #include <net/route.h> | |
45 | #include <net/inet_common.h> | |
46 | #include <net/checksum.h> | |
47 | ||
6d0bfe22 LC |
48 | #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 | |
55 | ||
ea074b34 SH |
56 | struct ping_table { |
57 | struct hlist_nulls_head hash[PING_HTABLE_SIZE]; | |
58 | rwlock_t lock; | |
59 | }; | |
c319b4d7 | 60 | |
ea074b34 | 61 | static struct ping_table ping_table; |
6d0bfe22 LC |
62 | struct pingv6_ops pingv6_ops; |
63 | EXPORT_SYMBOL_GPL(pingv6_ops); | |
c319b4d7 | 64 | |
1b1cb1f7 | 65 | static u16 ping_port_rover; |
c319b4d7 | 66 | |
95c96174 | 67 | static inline int ping_hashfn(struct net *net, unsigned int num, unsigned int mask) |
c319b4d7 VK |
68 | { |
69 | int res = (num + net_hash_mix(net)) & mask; | |
95c96174 | 70 | |
c319b4d7 VK |
71 | pr_debug("hash(%d) = %d\n", num, res); |
72 | return res; | |
73 | } | |
6d0bfe22 | 74 | EXPORT_SYMBOL_GPL(ping_hash); |
c319b4d7 VK |
75 | |
76 | static inline struct hlist_nulls_head *ping_hashslot(struct ping_table *table, | |
95c96174 | 77 | struct net *net, unsigned int num) |
c319b4d7 VK |
78 | { |
79 | return &table->hash[ping_hashfn(net, num, PING_HTABLE_MASK)]; | |
80 | } | |
81 | ||
6d0bfe22 | 82 | int ping_get_port(struct sock *sk, unsigned short ident) |
c319b4d7 VK |
83 | { |
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; | |
110 | next_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 | ||
6d0bfe22 LC |
120 | /* 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 | */ | |
c319b4d7 VK |
124 | 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 | ||
142 | fail: | |
143 | write_unlock_bh(&ping_table.lock); | |
144 | return 1; | |
145 | } | |
6d0bfe22 | 146 | EXPORT_SYMBOL_GPL(ping_get_port); |
c319b4d7 | 147 | |
6d0bfe22 | 148 | void ping_hash(struct sock *sk) |
c319b4d7 | 149 | { |
6d0bfe22 | 150 | pr_debug("ping_hash(sk->port=%u)\n", inet_sk(sk)->inet_num); |
c319b4d7 VK |
151 | BUG(); /* "Please do not press this button again." */ |
152 | } | |
153 | ||
6d0bfe22 | 154 | void ping_unhash(struct sock *sk) |
c319b4d7 VK |
155 | { |
156 | struct inet_sock *isk = inet_sk(sk); | |
6d0bfe22 | 157 | pr_debug("ping_unhash(isk=%p,isk->num=%u)\n", isk, isk->inet_num); |
c319b4d7 | 158 | if (sk_hashed(sk)) { |
c319b4d7 VK |
159 | write_lock_bh(&ping_table.lock); |
160 | hlist_nulls_del(&sk->sk_nulls_node); | |
161 | sock_put(sk); | |
747465ef ED |
162 | isk->inet_num = 0; |
163 | isk->inet_sport = 0; | |
c319b4d7 VK |
164 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); |
165 | write_unlock_bh(&ping_table.lock); | |
166 | } | |
167 | } | |
6d0bfe22 | 168 | EXPORT_SYMBOL_GPL(ping_unhash); |
c319b4d7 | 169 | |
6d0bfe22 | 170 | static struct sock *ping_lookup(struct net *net, struct sk_buff *skb, u16 ident) |
c319b4d7 VK |
171 | { |
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; | |
6d0bfe22 LC |
176 | int dif = skb->dev->ifindex; |
177 | ||
178 | 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 | } | |
c319b4d7 | 187 | |
c319b4d7 VK |
188 | read_lock_bh(&ping_table.lock); |
189 | ||
190 | ping_portaddr_for_each_entry(sk, hnode, hslot) { | |
191 | isk = inet_sk(sk); | |
192 | ||
c319b4d7 VK |
193 | pr_debug("iterate\n"); |
194 | if (isk->inet_num != ident) | |
195 | continue; | |
6d0bfe22 LC |
196 | |
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) { | |
6d0bfe22 LC |
209 | |
210 | pr_debug("found: %p: num=%d, daddr=%pI6c, dif=%d\n", sk, | |
211 | (int) isk->inet_num, | |
efe4208f | 212 | &sk->sk_v6_rcv_saddr, |
6d0bfe22 LC |
213 | sk->sk_bound_dev_if); |
214 | ||
efe4208f ED |
215 | if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) && |
216 | !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, | |
6d0bfe22 LC |
217 | &ipv6_hdr(skb)->daddr)) |
218 | continue; | |
219 | #endif | |
220 | } | |
221 | ||
c319b4d7 VK |
222 | if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) |
223 | continue; | |
224 | ||
225 | sock_hold(sk); | |
226 | goto exit; | |
227 | } | |
228 | ||
229 | sk = NULL; | |
230 | exit: | |
231 | read_unlock_bh(&ping_table.lock); | |
232 | ||
233 | return sk; | |
234 | } | |
235 | ||
7064d16e EB |
236 | static void inet_get_ping_group_range_net(struct net *net, kgid_t *low, |
237 | kgid_t *high) | |
f56e03e8 | 238 | { |
7064d16e | 239 | kgid_t *data = net->ipv4.sysctl_ping_group_range; |
95c96174 ED |
240 | unsigned int seq; |
241 | ||
f56e03e8 | 242 | do { |
0bbf87d8 | 243 | seq = read_seqbegin(&net->ipv4.sysctl_local_ports.lock); |
f56e03e8 VK |
244 | |
245 | *low = data[0]; | |
246 | *high = data[1]; | |
0bbf87d8 | 247 | } while (read_seqretry(&net->ipv4.sysctl_local_ports.lock, seq)); |
f56e03e8 VK |
248 | } |
249 | ||
250 | ||
6d0bfe22 | 251 | int ping_init_sock(struct sock *sk) |
c319b4d7 VK |
252 | { |
253 | struct net *net = sock_net(sk); | |
7064d16e | 254 | kgid_t group = current_egid(); |
c319b4d7 VK |
255 | struct group_info *group_info = get_current_groups(); |
256 | int i, j, count = group_info->ngroups; | |
ae2975bc | 257 | kgid_t low, high; |
c319b4d7 | 258 | |
7064d16e EB |
259 | inet_get_ping_group_range_net(net, &low, &high); |
260 | if (gid_lte(low, group) && gid_lte(group, high)) | |
c319b4d7 VK |
261 | return 0; |
262 | ||
263 | for (i = 0; i < group_info->nblocks; i++) { | |
264 | int cp_count = min_t(int, NGROUPS_PER_BLOCK, count); | |
c319b4d7 | 265 | for (j = 0; j < cp_count; j++) { |
ae2975bc EB |
266 | kgid_t gid = group_info->blocks[i][j]; |
267 | if (gid_lte(low, gid) && gid_lte(gid, high)) | |
c319b4d7 VK |
268 | return 0; |
269 | } | |
270 | ||
271 | count -= cp_count; | |
272 | } | |
273 | ||
274 | return -EACCES; | |
275 | } | |
6d0bfe22 | 276 | EXPORT_SYMBOL_GPL(ping_init_sock); |
c319b4d7 | 277 | |
6d0bfe22 | 278 | void ping_close(struct sock *sk, long timeout) |
c319b4d7 VK |
279 | { |
280 | pr_debug("ping_close(sk=%p,sk->num=%u)\n", | |
058bd4d2 | 281 | inet_sk(sk), inet_sk(sk)->inet_num); |
c319b4d7 VK |
282 | pr_debug("isk->refcnt = %d\n", sk->sk_refcnt.counter); |
283 | ||
284 | sk_common_release(sk); | |
285 | } | |
6d0bfe22 LC |
286 | EXPORT_SYMBOL_GPL(ping_close); |
287 | ||
288 | /* Checks the bind address and possibly modifies sk->sk_bound_dev_if. */ | |
a06a2d37 WF |
289 | static int ping_check_bind_addr(struct sock *sk, struct inet_sock *isk, |
290 | struct sockaddr *uaddr, int addr_len) { | |
6d0bfe22 LC |
291 | struct net *net = sock_net(sk); |
292 | if (sk->sk_family == AF_INET) { | |
293 | struct sockaddr_in *addr = (struct sockaddr_in *) uaddr; | |
294 | int chk_addr_ret; | |
295 | ||
296 | if (addr_len < sizeof(*addr)) | |
297 | return -EINVAL; | |
298 | ||
299 | pr_debug("ping_check_bind_addr(sk=%p,addr=%pI4,port=%d)\n", | |
300 | sk, &addr->sin_addr.s_addr, ntohs(addr->sin_port)); | |
301 | ||
302 | chk_addr_ret = inet_addr_type(net, addr->sin_addr.s_addr); | |
303 | ||
304 | if (addr->sin_addr.s_addr == htonl(INADDR_ANY)) | |
305 | chk_addr_ret = RTN_LOCAL; | |
306 | ||
307 | if ((sysctl_ip_nonlocal_bind == 0 && | |
308 | isk->freebind == 0 && isk->transparent == 0 && | |
309 | chk_addr_ret != RTN_LOCAL) || | |
310 | chk_addr_ret == RTN_MULTICAST || | |
311 | chk_addr_ret == RTN_BROADCAST) | |
312 | return -EADDRNOTAVAIL; | |
313 | ||
314 | #if IS_ENABLED(CONFIG_IPV6) | |
315 | } else if (sk->sk_family == AF_INET6) { | |
316 | struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr; | |
317 | int addr_type, scoped, has_addr; | |
318 | struct net_device *dev = NULL; | |
319 | ||
320 | if (addr_len < sizeof(*addr)) | |
321 | return -EINVAL; | |
322 | ||
323 | pr_debug("ping_check_bind_addr(sk=%p,addr=%pI6c,port=%d)\n", | |
324 | sk, addr->sin6_addr.s6_addr, ntohs(addr->sin6_port)); | |
325 | ||
326 | addr_type = ipv6_addr_type(&addr->sin6_addr); | |
327 | scoped = __ipv6_addr_needs_scope_id(addr_type); | |
328 | if ((addr_type != IPV6_ADDR_ANY && | |
329 | !(addr_type & IPV6_ADDR_UNICAST)) || | |
330 | (scoped && !addr->sin6_scope_id)) | |
331 | return -EINVAL; | |
332 | ||
333 | rcu_read_lock(); | |
334 | if (addr->sin6_scope_id) { | |
335 | dev = dev_get_by_index_rcu(net, addr->sin6_scope_id); | |
336 | if (!dev) { | |
337 | rcu_read_unlock(); | |
338 | return -ENODEV; | |
339 | } | |
340 | } | |
341 | has_addr = pingv6_ops.ipv6_chk_addr(net, &addr->sin6_addr, dev, | |
342 | scoped); | |
343 | rcu_read_unlock(); | |
344 | ||
345 | if (!(isk->freebind || isk->transparent || has_addr || | |
346 | addr_type == IPV6_ADDR_ANY)) | |
347 | return -EADDRNOTAVAIL; | |
348 | ||
349 | if (scoped) | |
350 | sk->sk_bound_dev_if = addr->sin6_scope_id; | |
351 | #endif | |
352 | } else { | |
353 | return -EAFNOSUPPORT; | |
354 | } | |
355 | return 0; | |
356 | } | |
357 | ||
a06a2d37 | 358 | static void ping_set_saddr(struct sock *sk, struct sockaddr *saddr) |
6d0bfe22 LC |
359 | { |
360 | if (saddr->sa_family == AF_INET) { | |
361 | struct inet_sock *isk = inet_sk(sk); | |
362 | struct sockaddr_in *addr = (struct sockaddr_in *) saddr; | |
363 | isk->inet_rcv_saddr = isk->inet_saddr = addr->sin_addr.s_addr; | |
364 | #if IS_ENABLED(CONFIG_IPV6) | |
365 | } else if (saddr->sa_family == AF_INET6) { | |
366 | struct sockaddr_in6 *addr = (struct sockaddr_in6 *) saddr; | |
367 | struct ipv6_pinfo *np = inet6_sk(sk); | |
efe4208f | 368 | sk->sk_v6_rcv_saddr = np->saddr = addr->sin6_addr; |
6d0bfe22 LC |
369 | #endif |
370 | } | |
371 | } | |
c319b4d7 | 372 | |
a06a2d37 | 373 | static void ping_clear_saddr(struct sock *sk, int dif) |
6d0bfe22 LC |
374 | { |
375 | sk->sk_bound_dev_if = dif; | |
376 | if (sk->sk_family == AF_INET) { | |
377 | struct inet_sock *isk = inet_sk(sk); | |
378 | isk->inet_rcv_saddr = isk->inet_saddr = 0; | |
379 | #if IS_ENABLED(CONFIG_IPV6) | |
380 | } else if (sk->sk_family == AF_INET6) { | |
381 | struct ipv6_pinfo *np = inet6_sk(sk); | |
efe4208f | 382 | memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr)); |
6d0bfe22 LC |
383 | memset(&np->saddr, 0, sizeof(np->saddr)); |
384 | #endif | |
385 | } | |
386 | } | |
c319b4d7 VK |
387 | /* |
388 | * We need our own bind because there are no privileged id's == local ports. | |
389 | * Moreover, we don't allow binding to multi- and broadcast addresses. | |
390 | */ | |
391 | ||
6d0bfe22 | 392 | int ping_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) |
c319b4d7 | 393 | { |
c319b4d7 VK |
394 | struct inet_sock *isk = inet_sk(sk); |
395 | unsigned short snum; | |
c319b4d7 | 396 | int err; |
6d0bfe22 | 397 | int dif = sk->sk_bound_dev_if; |
c319b4d7 | 398 | |
6d0bfe22 LC |
399 | err = ping_check_bind_addr(sk, isk, uaddr, addr_len); |
400 | if (err) | |
401 | return err; | |
c319b4d7 VK |
402 | |
403 | lock_sock(sk); | |
404 | ||
405 | err = -EINVAL; | |
406 | if (isk->inet_num != 0) | |
407 | goto out; | |
408 | ||
409 | err = -EADDRINUSE; | |
6d0bfe22 LC |
410 | ping_set_saddr(sk, uaddr); |
411 | snum = ntohs(((struct sockaddr_in *)uaddr)->sin_port); | |
412 | if (ping_get_port(sk, snum) != 0) { | |
413 | ping_clear_saddr(sk, dif); | |
c319b4d7 VK |
414 | goto out; |
415 | } | |
416 | ||
6d0bfe22 | 417 | pr_debug("after bind(): num = %d, dif = %d\n", |
058bd4d2 | 418 | (int)isk->inet_num, |
058bd4d2 | 419 | (int)sk->sk_bound_dev_if); |
c319b4d7 VK |
420 | |
421 | err = 0; | |
c2bb06db | 422 | if (sk->sk_family == AF_INET && isk->inet_rcv_saddr) |
c319b4d7 | 423 | sk->sk_userlocks |= SOCK_BINDADDR_LOCK; |
c2bb06db ED |
424 | #if IS_ENABLED(CONFIG_IPV6) |
425 | if (sk->sk_family == AF_INET6 && !ipv6_addr_any(&sk->sk_v6_rcv_saddr)) | |
426 | sk->sk_userlocks |= SOCK_BINDADDR_LOCK; | |
427 | #endif | |
6d0bfe22 | 428 | |
c319b4d7 VK |
429 | if (snum) |
430 | sk->sk_userlocks |= SOCK_BINDPORT_LOCK; | |
431 | isk->inet_sport = htons(isk->inet_num); | |
432 | isk->inet_daddr = 0; | |
433 | isk->inet_dport = 0; | |
6d0bfe22 LC |
434 | |
435 | #if IS_ENABLED(CONFIG_IPV6) | |
436 | if (sk->sk_family == AF_INET6) | |
efe4208f | 437 | memset(&sk->sk_v6_daddr, 0, sizeof(sk->sk_v6_daddr)); |
6d0bfe22 LC |
438 | #endif |
439 | ||
c319b4d7 VK |
440 | sk_dst_reset(sk); |
441 | out: | |
442 | release_sock(sk); | |
443 | pr_debug("ping_v4_bind -> %d\n", err); | |
444 | return err; | |
445 | } | |
6d0bfe22 | 446 | EXPORT_SYMBOL_GPL(ping_bind); |
c319b4d7 VK |
447 | |
448 | /* | |
449 | * Is this a supported type of ICMP message? | |
450 | */ | |
451 | ||
6d0bfe22 | 452 | static inline int ping_supported(int family, int type, int code) |
c319b4d7 | 453 | { |
6d0bfe22 LC |
454 | return (family == AF_INET && type == ICMP_ECHO && code == 0) || |
455 | (family == AF_INET6 && type == ICMPV6_ECHO_REQUEST && code == 0); | |
c319b4d7 VK |
456 | } |
457 | ||
458 | /* | |
459 | * This routine is called by the ICMP module when it gets some | |
460 | * sort of error condition. | |
461 | */ | |
462 | ||
6d0bfe22 | 463 | void ping_err(struct sk_buff *skb, int offset, u32 info) |
c319b4d7 | 464 | { |
6d0bfe22 LC |
465 | int family; |
466 | struct icmphdr *icmph; | |
c319b4d7 | 467 | struct inet_sock *inet_sock; |
6d0bfe22 LC |
468 | int type; |
469 | int code; | |
c319b4d7 VK |
470 | struct net *net = dev_net(skb->dev); |
471 | struct sock *sk; | |
472 | int harderr; | |
473 | int err; | |
474 | ||
6d0bfe22 LC |
475 | if (skb->protocol == htons(ETH_P_IP)) { |
476 | family = AF_INET; | |
477 | type = icmp_hdr(skb)->type; | |
478 | code = icmp_hdr(skb)->code; | |
479 | icmph = (struct icmphdr *)(skb->data + offset); | |
480 | } else if (skb->protocol == htons(ETH_P_IPV6)) { | |
481 | family = AF_INET6; | |
482 | type = icmp6_hdr(skb)->icmp6_type; | |
483 | code = icmp6_hdr(skb)->icmp6_code; | |
484 | icmph = (struct icmphdr *) (skb->data + offset); | |
485 | } else { | |
486 | BUG(); | |
487 | } | |
488 | ||
c319b4d7 VK |
489 | /* We assume the packet has already been checked by icmp_unreach */ |
490 | ||
6d0bfe22 | 491 | if (!ping_supported(family, icmph->type, icmph->code)) |
c319b4d7 VK |
492 | return; |
493 | ||
6d0bfe22 LC |
494 | pr_debug("ping_err(proto=0x%x,type=%d,code=%d,id=%04x,seq=%04x)\n", |
495 | skb->protocol, type, code, ntohs(icmph->un.echo.id), | |
496 | ntohs(icmph->un.echo.sequence)); | |
c319b4d7 | 497 | |
6d0bfe22 | 498 | sk = ping_lookup(net, skb, ntohs(icmph->un.echo.id)); |
c319b4d7 | 499 | if (sk == NULL) { |
c319b4d7 VK |
500 | pr_debug("no socket, dropping\n"); |
501 | return; /* No socket for error */ | |
502 | } | |
503 | pr_debug("err on socket %p\n", sk); | |
504 | ||
505 | err = 0; | |
506 | harderr = 0; | |
507 | inet_sock = inet_sk(sk); | |
508 | ||
6d0bfe22 LC |
509 | if (skb->protocol == htons(ETH_P_IP)) { |
510 | switch (type) { | |
511 | default: | |
512 | case ICMP_TIME_EXCEEDED: | |
513 | err = EHOSTUNREACH; | |
514 | break; | |
515 | case ICMP_SOURCE_QUENCH: | |
516 | /* This is not a real error but ping wants to see it. | |
517 | * Report it with some fake errno. | |
518 | */ | |
519 | err = EREMOTEIO; | |
520 | break; | |
521 | case ICMP_PARAMETERPROB: | |
522 | err = EPROTO; | |
523 | harderr = 1; | |
524 | break; | |
525 | case ICMP_DEST_UNREACH: | |
526 | if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */ | |
527 | ipv4_sk_update_pmtu(skb, sk, info); | |
528 | if (inet_sock->pmtudisc != IP_PMTUDISC_DONT) { | |
529 | err = EMSGSIZE; | |
530 | harderr = 1; | |
531 | break; | |
532 | } | |
533 | goto out; | |
c319b4d7 | 534 | } |
6d0bfe22 LC |
535 | err = EHOSTUNREACH; |
536 | if (code <= NR_ICMP_UNREACH) { | |
537 | harderr = icmp_err_convert[code].fatal; | |
538 | err = icmp_err_convert[code].errno; | |
539 | } | |
540 | break; | |
541 | case ICMP_REDIRECT: | |
542 | /* See ICMP_SOURCE_QUENCH */ | |
543 | ipv4_sk_redirect(skb, sk); | |
544 | err = EREMOTEIO; | |
545 | break; | |
c319b4d7 | 546 | } |
6d0bfe22 LC |
547 | #if IS_ENABLED(CONFIG_IPV6) |
548 | } else if (skb->protocol == htons(ETH_P_IPV6)) { | |
549 | harderr = pingv6_ops.icmpv6_err_convert(type, code, &err); | |
550 | #endif | |
c319b4d7 VK |
551 | } |
552 | ||
553 | /* | |
554 | * RFC1122: OK. Passes ICMP errors back to application, as per | |
555 | * 4.1.3.3. | |
556 | */ | |
6d0bfe22 LC |
557 | if ((family == AF_INET && !inet_sock->recverr) || |
558 | (family == AF_INET6 && !inet6_sk(sk)->recverr)) { | |
c319b4d7 VK |
559 | if (!harderr || sk->sk_state != TCP_ESTABLISHED) |
560 | goto out; | |
561 | } else { | |
6d0bfe22 LC |
562 | if (family == AF_INET) { |
563 | ip_icmp_error(sk, skb, err, 0 /* no remote port */, | |
564 | info, (u8 *)icmph); | |
565 | #if IS_ENABLED(CONFIG_IPV6) | |
566 | } else if (family == AF_INET6) { | |
567 | pingv6_ops.ipv6_icmp_error(sk, skb, err, 0, | |
568 | info, (u8 *)icmph); | |
569 | #endif | |
570 | } | |
c319b4d7 VK |
571 | } |
572 | sk->sk_err = err; | |
573 | sk->sk_error_report(sk); | |
574 | out: | |
575 | sock_put(sk); | |
576 | } | |
6d0bfe22 | 577 | EXPORT_SYMBOL_GPL(ping_err); |
c319b4d7 VK |
578 | |
579 | /* | |
6d0bfe22 LC |
580 | * Copy and checksum an ICMP Echo packet from user space into a buffer |
581 | * starting from the payload. | |
c319b4d7 VK |
582 | */ |
583 | ||
6d0bfe22 LC |
584 | int ping_getfrag(void *from, char *to, |
585 | int offset, int fraglen, int odd, struct sk_buff *skb) | |
c319b4d7 VK |
586 | { |
587 | struct pingfakehdr *pfh = (struct pingfakehdr *)from; | |
588 | ||
589 | if (offset == 0) { | |
590 | if (fraglen < sizeof(struct icmphdr)) | |
591 | BUG(); | |
592 | if (csum_partial_copy_fromiovecend(to + sizeof(struct icmphdr), | |
593 | pfh->iov, 0, fraglen - sizeof(struct icmphdr), | |
594 | &pfh->wcheck)) | |
595 | return -EFAULT; | |
6d0bfe22 LC |
596 | } else if (offset < sizeof(struct icmphdr)) { |
597 | BUG(); | |
598 | } else { | |
599 | if (csum_partial_copy_fromiovecend | |
600 | (to, pfh->iov, offset - sizeof(struct icmphdr), | |
601 | fraglen, &pfh->wcheck)) | |
602 | return -EFAULT; | |
603 | } | |
c319b4d7 | 604 | |
6d0bfe22 LC |
605 | #if IS_ENABLED(CONFIG_IPV6) |
606 | /* For IPv6, checksum each skb as we go along, as expected by | |
607 | * icmpv6_push_pending_frames. For IPv4, accumulate the checksum in | |
608 | * wcheck, it will be finalized in ping_v4_push_pending_frames. | |
609 | */ | |
610 | if (pfh->family == AF_INET6) { | |
611 | skb->csum = pfh->wcheck; | |
612 | skb->ip_summed = CHECKSUM_NONE; | |
613 | pfh->wcheck = 0; | |
c319b4d7 | 614 | } |
6d0bfe22 LC |
615 | #endif |
616 | ||
c319b4d7 VK |
617 | return 0; |
618 | } | |
6d0bfe22 | 619 | EXPORT_SYMBOL_GPL(ping_getfrag); |
c319b4d7 | 620 | |
6d0bfe22 LC |
621 | static int ping_v4_push_pending_frames(struct sock *sk, struct pingfakehdr *pfh, |
622 | struct flowi4 *fl4) | |
c319b4d7 VK |
623 | { |
624 | struct sk_buff *skb = skb_peek(&sk->sk_write_queue); | |
625 | ||
626 | pfh->wcheck = csum_partial((char *)&pfh->icmph, | |
627 | sizeof(struct icmphdr), pfh->wcheck); | |
628 | pfh->icmph.checksum = csum_fold(pfh->wcheck); | |
629 | memcpy(icmp_hdr(skb), &pfh->icmph, sizeof(struct icmphdr)); | |
630 | skb->ip_summed = CHECKSUM_NONE; | |
631 | return ip_push_pending_frames(sk, fl4); | |
632 | } | |
633 | ||
6d0bfe22 LC |
634 | int ping_common_sendmsg(int family, struct msghdr *msg, size_t len, |
635 | void *user_icmph, size_t icmph_len) { | |
636 | u8 type, code; | |
c319b4d7 VK |
637 | |
638 | if (len > 0xFFFF) | |
639 | return -EMSGSIZE; | |
640 | ||
641 | /* | |
642 | * Check the flags. | |
643 | */ | |
644 | ||
645 | /* Mirror BSD error message compatibility */ | |
646 | if (msg->msg_flags & MSG_OOB) | |
647 | return -EOPNOTSUPP; | |
648 | ||
649 | /* | |
650 | * Fetch the ICMP header provided by the userland. | |
6d0bfe22 | 651 | * iovec is modified! The ICMP header is consumed. |
c319b4d7 | 652 | */ |
6d0bfe22 | 653 | if (memcpy_fromiovec(user_icmph, msg->msg_iov, icmph_len)) |
c319b4d7 | 654 | return -EFAULT; |
6d0bfe22 LC |
655 | |
656 | if (family == AF_INET) { | |
657 | type = ((struct icmphdr *) user_icmph)->type; | |
658 | code = ((struct icmphdr *) user_icmph)->code; | |
659 | #if IS_ENABLED(CONFIG_IPV6) | |
660 | } else if (family == AF_INET6) { | |
661 | type = ((struct icmp6hdr *) user_icmph)->icmp6_type; | |
662 | code = ((struct icmp6hdr *) user_icmph)->icmp6_code; | |
663 | #endif | |
664 | } else { | |
665 | BUG(); | |
666 | } | |
667 | ||
668 | if (!ping_supported(family, type, code)) | |
c319b4d7 VK |
669 | return -EINVAL; |
670 | ||
6d0bfe22 LC |
671 | return 0; |
672 | } | |
673 | EXPORT_SYMBOL_GPL(ping_common_sendmsg); | |
674 | ||
ea074b34 SH |
675 | static int ping_v4_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
676 | size_t len) | |
6d0bfe22 LC |
677 | { |
678 | struct net *net = sock_net(sk); | |
679 | struct flowi4 fl4; | |
680 | struct inet_sock *inet = inet_sk(sk); | |
681 | struct ipcm_cookie ipc; | |
682 | struct icmphdr user_icmph; | |
683 | struct pingfakehdr pfh; | |
684 | struct rtable *rt = NULL; | |
685 | struct ip_options_data opt_copy; | |
686 | int free = 0; | |
687 | __be32 saddr, daddr, faddr; | |
688 | u8 tos; | |
689 | int err; | |
690 | ||
691 | pr_debug("ping_v4_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num); | |
692 | ||
693 | err = ping_common_sendmsg(AF_INET, msg, len, &user_icmph, | |
694 | sizeof(user_icmph)); | |
695 | if (err) | |
696 | return err; | |
697 | ||
c319b4d7 VK |
698 | /* |
699 | * Get and verify the address. | |
700 | */ | |
701 | ||
702 | if (msg->msg_name) { | |
703 | struct sockaddr_in *usin = (struct sockaddr_in *)msg->msg_name; | |
704 | if (msg->msg_namelen < sizeof(*usin)) | |
705 | return -EINVAL; | |
706 | if (usin->sin_family != AF_INET) | |
707 | return -EINVAL; | |
708 | daddr = usin->sin_addr.s_addr; | |
709 | /* no remote port */ | |
710 | } else { | |
711 | if (sk->sk_state != TCP_ESTABLISHED) | |
712 | return -EDESTADDRREQ; | |
713 | daddr = inet->inet_daddr; | |
714 | /* no remote port */ | |
715 | } | |
716 | ||
717 | ipc.addr = inet->inet_saddr; | |
718 | ipc.opt = NULL; | |
719 | ipc.oif = sk->sk_bound_dev_if; | |
720 | ipc.tx_flags = 0; | |
aa661581 FF |
721 | ipc.ttl = 0; |
722 | ipc.tos = -1; | |
bf84a010 DB |
723 | |
724 | sock_tx_timestamp(sk, &ipc.tx_flags); | |
c319b4d7 VK |
725 | |
726 | if (msg->msg_controllen) { | |
727 | err = ip_cmsg_send(sock_net(sk), msg, &ipc); | |
728 | if (err) | |
729 | return err; | |
730 | if (ipc.opt) | |
731 | free = 1; | |
732 | } | |
733 | if (!ipc.opt) { | |
734 | struct ip_options_rcu *inet_opt; | |
735 | ||
736 | rcu_read_lock(); | |
737 | inet_opt = rcu_dereference(inet->inet_opt); | |
738 | if (inet_opt) { | |
739 | memcpy(&opt_copy, inet_opt, | |
740 | sizeof(*inet_opt) + inet_opt->opt.optlen); | |
741 | ipc.opt = &opt_copy.opt; | |
742 | } | |
743 | rcu_read_unlock(); | |
744 | } | |
745 | ||
746 | saddr = ipc.addr; | |
747 | ipc.addr = faddr = daddr; | |
748 | ||
749 | if (ipc.opt && ipc.opt->opt.srr) { | |
750 | if (!daddr) | |
751 | return -EINVAL; | |
752 | faddr = ipc.opt->opt.faddr; | |
753 | } | |
aa661581 | 754 | tos = get_rttos(&ipc, inet); |
c319b4d7 VK |
755 | if (sock_flag(sk, SOCK_LOCALROUTE) || |
756 | (msg->msg_flags & MSG_DONTROUTE) || | |
757 | (ipc.opt && ipc.opt->opt.is_strictroute)) { | |
758 | tos |= RTO_ONLINK; | |
759 | } | |
760 | ||
761 | if (ipv4_is_multicast(daddr)) { | |
762 | if (!ipc.oif) | |
763 | ipc.oif = inet->mc_index; | |
764 | if (!saddr) | |
765 | saddr = inet->mc_addr; | |
76e21053 EH |
766 | } else if (!ipc.oif) |
767 | ipc.oif = inet->uc_index; | |
c319b4d7 VK |
768 | |
769 | flowi4_init_output(&fl4, ipc.oif, sk->sk_mark, tos, | |
770 | RT_SCOPE_UNIVERSE, sk->sk_protocol, | |
771 | inet_sk_flowi_flags(sk), faddr, saddr, 0, 0); | |
772 | ||
773 | security_sk_classify_flow(sk, flowi4_to_flowi(&fl4)); | |
774 | rt = ip_route_output_flow(net, &fl4, sk); | |
775 | if (IS_ERR(rt)) { | |
776 | err = PTR_ERR(rt); | |
777 | rt = NULL; | |
778 | if (err == -ENETUNREACH) | |
f1d8cba6 | 779 | IP_INC_STATS(net, IPSTATS_MIB_OUTNOROUTES); |
c319b4d7 VK |
780 | goto out; |
781 | } | |
782 | ||
783 | err = -EACCES; | |
784 | if ((rt->rt_flags & RTCF_BROADCAST) && | |
785 | !sock_flag(sk, SOCK_BROADCAST)) | |
786 | goto out; | |
787 | ||
788 | if (msg->msg_flags & MSG_CONFIRM) | |
789 | goto do_confirm; | |
790 | back_from_confirm: | |
791 | ||
792 | if (!ipc.addr) | |
793 | ipc.addr = fl4.daddr; | |
794 | ||
795 | lock_sock(sk); | |
796 | ||
797 | pfh.icmph.type = user_icmph.type; /* already checked */ | |
798 | pfh.icmph.code = user_icmph.code; /* ditto */ | |
799 | pfh.icmph.checksum = 0; | |
800 | pfh.icmph.un.echo.id = inet->inet_sport; | |
801 | pfh.icmph.un.echo.sequence = user_icmph.un.echo.sequence; | |
802 | pfh.iov = msg->msg_iov; | |
803 | pfh.wcheck = 0; | |
6d0bfe22 | 804 | pfh.family = AF_INET; |
c319b4d7 VK |
805 | |
806 | err = ip_append_data(sk, &fl4, ping_getfrag, &pfh, len, | |
807 | 0, &ipc, &rt, msg->msg_flags); | |
808 | if (err) | |
809 | ip_flush_pending_frames(sk); | |
810 | else | |
6d0bfe22 | 811 | err = ping_v4_push_pending_frames(sk, &pfh, &fl4); |
c319b4d7 VK |
812 | release_sock(sk); |
813 | ||
814 | out: | |
815 | ip_rt_put(rt); | |
816 | if (free) | |
817 | kfree(ipc.opt); | |
818 | if (!err) { | |
819 | icmp_out_count(sock_net(sk), user_icmph.type); | |
820 | return len; | |
821 | } | |
822 | return err; | |
823 | ||
824 | do_confirm: | |
825 | dst_confirm(&rt->dst); | |
826 | if (!(msg->msg_flags & MSG_PROBE) || len) | |
827 | goto back_from_confirm; | |
828 | err = 0; | |
829 | goto out; | |
830 | } | |
831 | ||
6d0bfe22 LC |
832 | int ping_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
833 | size_t len, int noblock, int flags, int *addr_len) | |
c319b4d7 VK |
834 | { |
835 | struct inet_sock *isk = inet_sk(sk); | |
6d0bfe22 | 836 | int family = sk->sk_family; |
c319b4d7 VK |
837 | struct sk_buff *skb; |
838 | int copied, err; | |
839 | ||
840 | pr_debug("ping_recvmsg(sk=%p,sk->num=%u)\n", isk, isk->inet_num); | |
841 | ||
a5e7424d | 842 | err = -EOPNOTSUPP; |
c319b4d7 VK |
843 | if (flags & MSG_OOB) |
844 | goto out; | |
845 | ||
6d0bfe22 LC |
846 | if (flags & MSG_ERRQUEUE) { |
847 | if (family == AF_INET) { | |
85fbaa75 | 848 | return ip_recv_error(sk, msg, len, addr_len); |
6d0bfe22 LC |
849 | #if IS_ENABLED(CONFIG_IPV6) |
850 | } else if (family == AF_INET6) { | |
85fbaa75 HFS |
851 | return pingv6_ops.ipv6_recv_error(sk, msg, len, |
852 | addr_len); | |
6d0bfe22 LC |
853 | #endif |
854 | } | |
855 | } | |
c319b4d7 VK |
856 | |
857 | skb = skb_recv_datagram(sk, flags, noblock, &err); | |
858 | if (!skb) | |
859 | goto out; | |
860 | ||
861 | copied = skb->len; | |
862 | if (copied > len) { | |
863 | msg->msg_flags |= MSG_TRUNC; | |
864 | copied = len; | |
865 | } | |
866 | ||
867 | /* Don't bother checking the checksum */ | |
868 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
869 | if (err) | |
870 | goto done; | |
871 | ||
872 | sock_recv_timestamp(msg, sk, skb); | |
873 | ||
6d0bfe22 LC |
874 | /* Copy the address and add cmsg data. */ |
875 | if (family == AF_INET) { | |
bceaa902 HFS |
876 | struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name; |
877 | ||
cf970c00 HFS |
878 | if (sin) { |
879 | sin->sin_family = AF_INET; | |
880 | sin->sin_port = 0 /* skb->h.uh->source */; | |
881 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; | |
882 | memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
883 | *addr_len = sizeof(*sin); | |
884 | } | |
6d0bfe22 LC |
885 | |
886 | if (isk->cmsg_flags) | |
887 | ip_cmsg_recv(msg, skb); | |
888 | ||
889 | #if IS_ENABLED(CONFIG_IPV6) | |
890 | } else if (family == AF_INET6) { | |
891 | struct ipv6_pinfo *np = inet6_sk(sk); | |
892 | struct ipv6hdr *ip6 = ipv6_hdr(skb); | |
bceaa902 HFS |
893 | struct sockaddr_in6 *sin6 = |
894 | (struct sockaddr_in6 *)msg->msg_name; | |
895 | ||
cf970c00 HFS |
896 | if (sin6) { |
897 | sin6->sin6_family = AF_INET6; | |
898 | sin6->sin6_port = 0; | |
899 | sin6->sin6_addr = ip6->saddr; | |
900 | sin6->sin6_flowinfo = 0; | |
901 | if (np->sndflow) | |
902 | sin6->sin6_flowinfo = ip6_flowinfo(ip6); | |
903 | sin6->sin6_scope_id = | |
904 | ipv6_iface_scope_id(&sin6->sin6_addr, | |
905 | IP6CB(skb)->iif); | |
906 | *addr_len = sizeof(*sin6); | |
907 | } | |
6d0bfe22 LC |
908 | |
909 | if (inet6_sk(sk)->rxopt.all) | |
910 | pingv6_ops.ip6_datagram_recv_ctl(sk, msg, skb); | |
911 | #endif | |
912 | } else { | |
913 | BUG(); | |
c319b4d7 | 914 | } |
6d0bfe22 | 915 | |
c319b4d7 VK |
916 | err = copied; |
917 | ||
918 | done: | |
919 | skb_free_datagram(sk, skb); | |
920 | out: | |
921 | pr_debug("ping_recvmsg -> %d\n", err); | |
922 | return err; | |
923 | } | |
6d0bfe22 | 924 | EXPORT_SYMBOL_GPL(ping_recvmsg); |
c319b4d7 | 925 | |
6d0bfe22 | 926 | int ping_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
c319b4d7 VK |
927 | { |
928 | pr_debug("ping_queue_rcv_skb(sk=%p,sk->num=%d,skb=%p)\n", | |
058bd4d2 | 929 | inet_sk(sk), inet_sk(sk)->inet_num, skb); |
c319b4d7 | 930 | if (sock_queue_rcv_skb(sk, skb) < 0) { |
c319b4d7 VK |
931 | kfree_skb(skb); |
932 | pr_debug("ping_queue_rcv_skb -> failed\n"); | |
933 | return -1; | |
934 | } | |
935 | return 0; | |
936 | } | |
6d0bfe22 | 937 | EXPORT_SYMBOL_GPL(ping_queue_rcv_skb); |
c319b4d7 VK |
938 | |
939 | ||
940 | /* | |
941 | * All we need to do is get the socket. | |
942 | */ | |
943 | ||
944 | void ping_rcv(struct sk_buff *skb) | |
945 | { | |
946 | struct sock *sk; | |
947 | struct net *net = dev_net(skb->dev); | |
c319b4d7 | 948 | struct icmphdr *icmph = icmp_hdr(skb); |
c319b4d7 VK |
949 | |
950 | /* We assume the packet has already been checked by icmp_rcv */ | |
951 | ||
952 | pr_debug("ping_rcv(skb=%p,id=%04x,seq=%04x)\n", | |
058bd4d2 | 953 | skb, ntohs(icmph->un.echo.id), ntohs(icmph->un.echo.sequence)); |
c319b4d7 VK |
954 | |
955 | /* Push ICMP header back */ | |
956 | skb_push(skb, skb->data - (u8 *)icmph); | |
957 | ||
6d0bfe22 | 958 | sk = ping_lookup(net, skb, ntohs(icmph->un.echo.id)); |
c319b4d7 VK |
959 | if (sk != NULL) { |
960 | pr_debug("rcv on socket %p\n", sk); | |
961 | ping_queue_rcv_skb(sk, skb_get(skb)); | |
962 | sock_put(sk); | |
963 | return; | |
964 | } | |
965 | pr_debug("no socket, dropping\n"); | |
966 | ||
967 | /* We're called from icmp_rcv(). kfree_skb() is done there. */ | |
968 | } | |
6d0bfe22 | 969 | EXPORT_SYMBOL_GPL(ping_rcv); |
c319b4d7 VK |
970 | |
971 | struct proto ping_prot = { | |
972 | .name = "PING", | |
973 | .owner = THIS_MODULE, | |
974 | .init = ping_init_sock, | |
975 | .close = ping_close, | |
976 | .connect = ip4_datagram_connect, | |
977 | .disconnect = udp_disconnect, | |
c319b4d7 VK |
978 | .setsockopt = ip_setsockopt, |
979 | .getsockopt = ip_getsockopt, | |
6d0bfe22 | 980 | .sendmsg = ping_v4_sendmsg, |
c319b4d7 VK |
981 | .recvmsg = ping_recvmsg, |
982 | .bind = ping_bind, | |
983 | .backlog_rcv = ping_queue_rcv_skb, | |
8141ed9f | 984 | .release_cb = ip4_datagram_release_cb, |
6d0bfe22 LC |
985 | .hash = ping_hash, |
986 | .unhash = ping_unhash, | |
987 | .get_port = ping_get_port, | |
c319b4d7 VK |
988 | .obj_size = sizeof(struct inet_sock), |
989 | }; | |
990 | EXPORT_SYMBOL(ping_prot); | |
991 | ||
992 | #ifdef CONFIG_PROC_FS | |
993 | ||
994 | static struct sock *ping_get_first(struct seq_file *seq, int start) | |
995 | { | |
996 | struct sock *sk; | |
997 | struct ping_iter_state *state = seq->private; | |
998 | struct net *net = seq_file_net(seq); | |
999 | ||
1000 | for (state->bucket = start; state->bucket < PING_HTABLE_SIZE; | |
1001 | ++state->bucket) { | |
1002 | struct hlist_nulls_node *node; | |
75e308c8 CG |
1003 | struct hlist_nulls_head *hslot; |
1004 | ||
1005 | hslot = &ping_table.hash[state->bucket]; | |
c319b4d7 VK |
1006 | |
1007 | if (hlist_nulls_empty(hslot)) | |
1008 | continue; | |
1009 | ||
1010 | sk_nulls_for_each(sk, node, hslot) { | |
8cc785f6 LC |
1011 | if (net_eq(sock_net(sk), net) && |
1012 | sk->sk_family == state->family) | |
c319b4d7 VK |
1013 | goto found; |
1014 | } | |
1015 | } | |
1016 | sk = NULL; | |
1017 | found: | |
1018 | return sk; | |
1019 | } | |
1020 | ||
1021 | static struct sock *ping_get_next(struct seq_file *seq, struct sock *sk) | |
1022 | { | |
1023 | struct ping_iter_state *state = seq->private; | |
1024 | struct net *net = seq_file_net(seq); | |
1025 | ||
1026 | do { | |
1027 | sk = sk_nulls_next(sk); | |
1028 | } while (sk && (!net_eq(sock_net(sk), net))); | |
1029 | ||
1030 | if (!sk) | |
1031 | return ping_get_first(seq, state->bucket + 1); | |
1032 | return sk; | |
1033 | } | |
1034 | ||
1035 | static struct sock *ping_get_idx(struct seq_file *seq, loff_t pos) | |
1036 | { | |
1037 | struct sock *sk = ping_get_first(seq, 0); | |
1038 | ||
1039 | if (sk) | |
1040 | while (pos && (sk = ping_get_next(seq, sk)) != NULL) | |
1041 | --pos; | |
1042 | return pos ? NULL : sk; | |
1043 | } | |
1044 | ||
d862e546 | 1045 | void *ping_seq_start(struct seq_file *seq, loff_t *pos, sa_family_t family) |
c319b4d7 VK |
1046 | { |
1047 | struct ping_iter_state *state = seq->private; | |
1048 | state->bucket = 0; | |
8cc785f6 | 1049 | state->family = family; |
c319b4d7 VK |
1050 | |
1051 | read_lock_bh(&ping_table.lock); | |
1052 | ||
1053 | return *pos ? ping_get_idx(seq, *pos-1) : SEQ_START_TOKEN; | |
1054 | } | |
d862e546 | 1055 | EXPORT_SYMBOL_GPL(ping_seq_start); |
c319b4d7 | 1056 | |
8cc785f6 LC |
1057 | static void *ping_v4_seq_start(struct seq_file *seq, loff_t *pos) |
1058 | { | |
1059 | return ping_seq_start(seq, pos, AF_INET); | |
1060 | } | |
1061 | ||
d862e546 | 1062 | void *ping_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
c319b4d7 VK |
1063 | { |
1064 | struct sock *sk; | |
1065 | ||
1066 | if (v == SEQ_START_TOKEN) | |
1067 | sk = ping_get_idx(seq, 0); | |
1068 | else | |
1069 | sk = ping_get_next(seq, v); | |
1070 | ||
1071 | ++*pos; | |
1072 | return sk; | |
1073 | } | |
d862e546 | 1074 | EXPORT_SYMBOL_GPL(ping_seq_next); |
c319b4d7 | 1075 | |
d862e546 | 1076 | void ping_seq_stop(struct seq_file *seq, void *v) |
c319b4d7 VK |
1077 | { |
1078 | read_unlock_bh(&ping_table.lock); | |
1079 | } | |
d862e546 | 1080 | EXPORT_SYMBOL_GPL(ping_seq_stop); |
c319b4d7 | 1081 | |
8cc785f6 | 1082 | static void ping_v4_format_sock(struct sock *sp, struct seq_file *f, |
652586df | 1083 | int bucket) |
c319b4d7 VK |
1084 | { |
1085 | struct inet_sock *inet = inet_sk(sp); | |
1086 | __be32 dest = inet->inet_daddr; | |
1087 | __be32 src = inet->inet_rcv_saddr; | |
1088 | __u16 destp = ntohs(inet->inet_dport); | |
1089 | __u16 srcp = ntohs(inet->inet_sport); | |
1090 | ||
1091 | seq_printf(f, "%5d: %08X:%04X %08X:%04X" | |
652586df | 1092 | " %02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d", |
c319b4d7 VK |
1093 | bucket, src, srcp, dest, destp, sp->sk_state, |
1094 | sk_wmem_alloc_get(sp), | |
1095 | sk_rmem_alloc_get(sp), | |
a7cb5a49 EB |
1096 | 0, 0L, 0, |
1097 | from_kuid_munged(seq_user_ns(f), sock_i_uid(sp)), | |
1098 | 0, sock_i_ino(sp), | |
c319b4d7 | 1099 | atomic_read(&sp->sk_refcnt), sp, |
652586df | 1100 | atomic_read(&sp->sk_drops)); |
c319b4d7 VK |
1101 | } |
1102 | ||
8cc785f6 | 1103 | static int ping_v4_seq_show(struct seq_file *seq, void *v) |
c319b4d7 | 1104 | { |
652586df | 1105 | seq_setwidth(seq, 127); |
c319b4d7 | 1106 | if (v == SEQ_START_TOKEN) |
652586df | 1107 | seq_puts(seq, " sl local_address rem_address st tx_queue " |
c319b4d7 VK |
1108 | "rx_queue tr tm->when retrnsmt uid timeout " |
1109 | "inode ref pointer drops"); | |
1110 | else { | |
1111 | struct ping_iter_state *state = seq->private; | |
c319b4d7 | 1112 | |
652586df | 1113 | ping_v4_format_sock(v, seq, state->bucket); |
c319b4d7 | 1114 | } |
652586df | 1115 | seq_pad(seq, '\n'); |
c319b4d7 VK |
1116 | return 0; |
1117 | } | |
1118 | ||
8cc785f6 LC |
1119 | static const struct seq_operations ping_v4_seq_ops = { |
1120 | .show = ping_v4_seq_show, | |
1121 | .start = ping_v4_seq_start, | |
c319b4d7 VK |
1122 | .next = ping_seq_next, |
1123 | .stop = ping_seq_stop, | |
1124 | }; | |
1125 | ||
1126 | static int ping_seq_open(struct inode *inode, struct file *file) | |
1127 | { | |
8cc785f6 LC |
1128 | struct ping_seq_afinfo *afinfo = PDE_DATA(inode); |
1129 | return seq_open_net(inode, file, &afinfo->seq_ops, | |
c319b4d7 VK |
1130 | sizeof(struct ping_iter_state)); |
1131 | } | |
1132 | ||
d862e546 | 1133 | const struct file_operations ping_seq_fops = { |
c319b4d7 VK |
1134 | .open = ping_seq_open, |
1135 | .read = seq_read, | |
1136 | .llseek = seq_lseek, | |
1137 | .release = seq_release_net, | |
1138 | }; | |
d862e546 | 1139 | EXPORT_SYMBOL_GPL(ping_seq_fops); |
c319b4d7 | 1140 | |
8cc785f6 LC |
1141 | static struct ping_seq_afinfo ping_v4_seq_afinfo = { |
1142 | .name = "icmp", | |
1143 | .family = AF_INET, | |
1144 | .seq_fops = &ping_seq_fops, | |
1145 | .seq_ops = { | |
1146 | .start = ping_v4_seq_start, | |
1147 | .show = ping_v4_seq_show, | |
1148 | .next = ping_seq_next, | |
1149 | .stop = ping_seq_stop, | |
1150 | }, | |
1151 | }; | |
1152 | ||
d862e546 | 1153 | int ping_proc_register(struct net *net, struct ping_seq_afinfo *afinfo) |
c319b4d7 VK |
1154 | { |
1155 | struct proc_dir_entry *p; | |
8cc785f6 LC |
1156 | p = proc_create_data(afinfo->name, S_IRUGO, net->proc_net, |
1157 | afinfo->seq_fops, afinfo); | |
c319b4d7 | 1158 | if (!p) |
8cc785f6 LC |
1159 | return -ENOMEM; |
1160 | return 0; | |
c319b4d7 | 1161 | } |
d862e546 | 1162 | EXPORT_SYMBOL_GPL(ping_proc_register); |
c319b4d7 | 1163 | |
d862e546 | 1164 | void ping_proc_unregister(struct net *net, struct ping_seq_afinfo *afinfo) |
c319b4d7 | 1165 | { |
8cc785f6 | 1166 | remove_proc_entry(afinfo->name, net->proc_net); |
c319b4d7 | 1167 | } |
d862e546 | 1168 | EXPORT_SYMBOL_GPL(ping_proc_unregister); |
c319b4d7 | 1169 | |
8cc785f6 | 1170 | static int __net_init ping_v4_proc_init_net(struct net *net) |
c319b4d7 | 1171 | { |
8cc785f6 | 1172 | return ping_proc_register(net, &ping_v4_seq_afinfo); |
c319b4d7 VK |
1173 | } |
1174 | ||
8cc785f6 | 1175 | static void __net_exit ping_v4_proc_exit_net(struct net *net) |
c319b4d7 | 1176 | { |
8cc785f6 | 1177 | ping_proc_unregister(net, &ping_v4_seq_afinfo); |
c319b4d7 VK |
1178 | } |
1179 | ||
8cc785f6 LC |
1180 | static struct pernet_operations ping_v4_net_ops = { |
1181 | .init = ping_v4_proc_init_net, | |
1182 | .exit = ping_v4_proc_exit_net, | |
c319b4d7 VK |
1183 | }; |
1184 | ||
1185 | int __init ping_proc_init(void) | |
1186 | { | |
8cc785f6 | 1187 | return register_pernet_subsys(&ping_v4_net_ops); |
c319b4d7 VK |
1188 | } |
1189 | ||
1190 | void ping_proc_exit(void) | |
1191 | { | |
8cc785f6 | 1192 | unregister_pernet_subsys(&ping_v4_net_ops); |
c319b4d7 VK |
1193 | } |
1194 | ||
1195 | #endif | |
1196 | ||
1197 | void __init ping_init(void) | |
1198 | { | |
1199 | int i; | |
1200 | ||
1201 | for (i = 0; i < PING_HTABLE_SIZE; i++) | |
1202 | INIT_HLIST_NULLS_HEAD(&ping_table.hash[i], i); | |
1203 | rwlock_init(&ping_table.lock); | |
1204 | } |