Commit | Line | Data |
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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 | |
6eada011 | 67 | static inline u32 ping_hashfn(const struct net *net, u32 num, u32 mask) |
c319b4d7 | 68 | { |
6eada011 | 69 | u32 res = (num + net_hash_mix(net)) & mask; |
95c96174 | 70 | |
6eada011 | 71 | pr_debug("hash(%u) = %u\n", num, res); |
c319b4d7 VK |
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 | |
086c653f | 148 | int ping_hash(struct sock *sk) |
c319b4d7 | 149 | { |
6d0bfe22 | 150 | pr_debug("ping_hash(sk->port=%u)\n", inet_sk(sk)->inet_num); |
c319b4d7 | 151 | BUG(); /* "Please do not press this button again." */ |
086c653f CG |
152 | |
153 | return 0; | |
c319b4d7 VK |
154 | } |
155 | ||
6d0bfe22 | 156 | void ping_unhash(struct sock *sk) |
c319b4d7 VK |
157 | { |
158 | struct inet_sock *isk = inet_sk(sk); | |
43a66845 | 159 | |
6d0bfe22 | 160 | pr_debug("ping_unhash(isk=%p,isk->num=%u)\n", isk, isk->inet_num); |
43a66845 | 161 | write_lock_bh(&ping_table.lock); |
c319b4d7 | 162 | if (sk_hashed(sk)) { |
c319b4d7 | 163 | hlist_nulls_del(&sk->sk_nulls_node); |
a134f083 | 164 | sk_nulls_node_init(&sk->sk_nulls_node); |
c319b4d7 | 165 | sock_put(sk); |
747465ef ED |
166 | isk->inet_num = 0; |
167 | isk->inet_sport = 0; | |
c319b4d7 | 168 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); |
c319b4d7 | 169 | } |
43a66845 | 170 | write_unlock_bh(&ping_table.lock); |
c319b4d7 | 171 | } |
6d0bfe22 | 172 | EXPORT_SYMBOL_GPL(ping_unhash); |
c319b4d7 | 173 | |
6d0bfe22 | 174 | static struct sock *ping_lookup(struct net *net, struct sk_buff *skb, u16 ident) |
c319b4d7 VK |
175 | { |
176 | struct hlist_nulls_head *hslot = ping_hashslot(&ping_table, net, ident); | |
177 | struct sock *sk = NULL; | |
178 | struct inet_sock *isk; | |
179 | struct hlist_nulls_node *hnode; | |
6d0bfe22 LC |
180 | int dif = skb->dev->ifindex; |
181 | ||
182 | if (skb->protocol == htons(ETH_P_IP)) { | |
183 | pr_debug("try to find: num = %d, daddr = %pI4, dif = %d\n", | |
184 | (int)ident, &ip_hdr(skb)->daddr, dif); | |
185 | #if IS_ENABLED(CONFIG_IPV6) | |
186 | } else if (skb->protocol == htons(ETH_P_IPV6)) { | |
187 | pr_debug("try to find: num = %d, daddr = %pI6c, dif = %d\n", | |
188 | (int)ident, &ipv6_hdr(skb)->daddr, dif); | |
189 | #endif | |
190 | } | |
c319b4d7 | 191 | |
c319b4d7 VK |
192 | read_lock_bh(&ping_table.lock); |
193 | ||
194 | ping_portaddr_for_each_entry(sk, hnode, hslot) { | |
195 | isk = inet_sk(sk); | |
196 | ||
c319b4d7 VK |
197 | pr_debug("iterate\n"); |
198 | if (isk->inet_num != ident) | |
199 | continue; | |
6d0bfe22 LC |
200 | |
201 | if (skb->protocol == htons(ETH_P_IP) && | |
202 | sk->sk_family == AF_INET) { | |
203 | pr_debug("found: %p: num=%d, daddr=%pI4, dif=%d\n", sk, | |
204 | (int) isk->inet_num, &isk->inet_rcv_saddr, | |
205 | sk->sk_bound_dev_if); | |
206 | ||
207 | if (isk->inet_rcv_saddr && | |
208 | isk->inet_rcv_saddr != ip_hdr(skb)->daddr) | |
209 | continue; | |
210 | #if IS_ENABLED(CONFIG_IPV6) | |
211 | } else if (skb->protocol == htons(ETH_P_IPV6) && | |
212 | sk->sk_family == AF_INET6) { | |
6d0bfe22 LC |
213 | |
214 | pr_debug("found: %p: num=%d, daddr=%pI6c, dif=%d\n", sk, | |
215 | (int) isk->inet_num, | |
efe4208f | 216 | &sk->sk_v6_rcv_saddr, |
6d0bfe22 LC |
217 | sk->sk_bound_dev_if); |
218 | ||
efe4208f ED |
219 | if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) && |
220 | !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, | |
6d0bfe22 LC |
221 | &ipv6_hdr(skb)->daddr)) |
222 | continue; | |
223 | #endif | |
91a0b603 JZ |
224 | } else { |
225 | continue; | |
6d0bfe22 LC |
226 | } |
227 | ||
c319b4d7 VK |
228 | if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) |
229 | continue; | |
230 | ||
231 | sock_hold(sk); | |
232 | goto exit; | |
233 | } | |
234 | ||
235 | sk = NULL; | |
236 | exit: | |
237 | read_unlock_bh(&ping_table.lock); | |
238 | ||
239 | return sk; | |
240 | } | |
241 | ||
7064d16e EB |
242 | static void inet_get_ping_group_range_net(struct net *net, kgid_t *low, |
243 | kgid_t *high) | |
f56e03e8 | 244 | { |
ba6b918a | 245 | kgid_t *data = net->ipv4.ping_group_range.range; |
95c96174 ED |
246 | unsigned int seq; |
247 | ||
f56e03e8 | 248 | do { |
ba6b918a | 249 | seq = read_seqbegin(&net->ipv4.ping_group_range.lock); |
f56e03e8 VK |
250 | |
251 | *low = data[0]; | |
252 | *high = data[1]; | |
ba6b918a | 253 | } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq)); |
f56e03e8 VK |
254 | } |
255 | ||
256 | ||
6d0bfe22 | 257 | int ping_init_sock(struct sock *sk) |
c319b4d7 VK |
258 | { |
259 | struct net *net = sock_net(sk); | |
7064d16e | 260 | kgid_t group = current_egid(); |
b04c4619 | 261 | struct group_info *group_info; |
81243eac | 262 | int i; |
ae2975bc | 263 | kgid_t low, high; |
b04c4619 | 264 | int ret = 0; |
c319b4d7 | 265 | |
9145736d LC |
266 | if (sk->sk_family == AF_INET6) |
267 | sk->sk_ipv6only = 1; | |
268 | ||
7064d16e EB |
269 | inet_get_ping_group_range_net(net, &low, &high); |
270 | if (gid_lte(low, group) && gid_lte(group, high)) | |
c319b4d7 VK |
271 | return 0; |
272 | ||
b04c4619 | 273 | group_info = get_current_groups(); |
81243eac AD |
274 | for (i = 0; i < group_info->ngroups; i++) { |
275 | kgid_t gid = group_info->gid[i]; | |
c319b4d7 | 276 | |
81243eac AD |
277 | if (gid_lte(low, gid) && gid_lte(gid, high)) |
278 | goto out_release_group; | |
c319b4d7 VK |
279 | } |
280 | ||
b04c4619 WX |
281 | ret = -EACCES; |
282 | ||
283 | out_release_group: | |
284 | put_group_info(group_info); | |
285 | return ret; | |
c319b4d7 | 286 | } |
6d0bfe22 | 287 | EXPORT_SYMBOL_GPL(ping_init_sock); |
c319b4d7 | 288 | |
6d0bfe22 | 289 | void ping_close(struct sock *sk, long timeout) |
c319b4d7 VK |
290 | { |
291 | pr_debug("ping_close(sk=%p,sk->num=%u)\n", | |
058bd4d2 | 292 | inet_sk(sk), inet_sk(sk)->inet_num); |
41c6d650 | 293 | pr_debug("isk->refcnt = %d\n", refcount_read(&sk->sk_refcnt)); |
c319b4d7 VK |
294 | |
295 | sk_common_release(sk); | |
296 | } | |
6d0bfe22 LC |
297 | EXPORT_SYMBOL_GPL(ping_close); |
298 | ||
299 | /* Checks the bind address and possibly modifies sk->sk_bound_dev_if. */ | |
a06a2d37 WF |
300 | static int ping_check_bind_addr(struct sock *sk, struct inet_sock *isk, |
301 | struct sockaddr *uaddr, int addr_len) { | |
6d0bfe22 LC |
302 | struct net *net = sock_net(sk); |
303 | if (sk->sk_family == AF_INET) { | |
304 | struct sockaddr_in *addr = (struct sockaddr_in *) uaddr; | |
305 | int chk_addr_ret; | |
306 | ||
307 | if (addr_len < sizeof(*addr)) | |
308 | return -EINVAL; | |
309 | ||
9145736d LC |
310 | if (addr->sin_family != AF_INET && |
311 | !(addr->sin_family == AF_UNSPEC && | |
312 | addr->sin_addr.s_addr == htonl(INADDR_ANY))) | |
313 | return -EAFNOSUPPORT; | |
314 | ||
6d0bfe22 LC |
315 | pr_debug("ping_check_bind_addr(sk=%p,addr=%pI4,port=%d)\n", |
316 | sk, &addr->sin_addr.s_addr, ntohs(addr->sin_port)); | |
317 | ||
318 | chk_addr_ret = inet_addr_type(net, addr->sin_addr.s_addr); | |
319 | ||
320 | if (addr->sin_addr.s_addr == htonl(INADDR_ANY)) | |
321 | chk_addr_ret = RTN_LOCAL; | |
322 | ||
83ba4645 | 323 | if ((!inet_can_nonlocal_bind(net, isk) && |
6d0bfe22 LC |
324 | chk_addr_ret != RTN_LOCAL) || |
325 | chk_addr_ret == RTN_MULTICAST || | |
326 | chk_addr_ret == RTN_BROADCAST) | |
327 | return -EADDRNOTAVAIL; | |
328 | ||
329 | #if IS_ENABLED(CONFIG_IPV6) | |
330 | } else if (sk->sk_family == AF_INET6) { | |
331 | struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr; | |
332 | int addr_type, scoped, has_addr; | |
333 | struct net_device *dev = NULL; | |
334 | ||
335 | if (addr_len < sizeof(*addr)) | |
336 | return -EINVAL; | |
337 | ||
82b276cd | 338 | if (addr->sin6_family != AF_INET6) |
9145736d | 339 | return -EAFNOSUPPORT; |
82b276cd | 340 | |
6d0bfe22 LC |
341 | pr_debug("ping_check_bind_addr(sk=%p,addr=%pI6c,port=%d)\n", |
342 | sk, addr->sin6_addr.s6_addr, ntohs(addr->sin6_port)); | |
343 | ||
344 | addr_type = ipv6_addr_type(&addr->sin6_addr); | |
345 | scoped = __ipv6_addr_needs_scope_id(addr_type); | |
346 | if ((addr_type != IPV6_ADDR_ANY && | |
347 | !(addr_type & IPV6_ADDR_UNICAST)) || | |
348 | (scoped && !addr->sin6_scope_id)) | |
349 | return -EINVAL; | |
350 | ||
351 | rcu_read_lock(); | |
352 | if (addr->sin6_scope_id) { | |
353 | dev = dev_get_by_index_rcu(net, addr->sin6_scope_id); | |
354 | if (!dev) { | |
355 | rcu_read_unlock(); | |
356 | return -ENODEV; | |
357 | } | |
358 | } | |
359 | has_addr = pingv6_ops.ipv6_chk_addr(net, &addr->sin6_addr, dev, | |
360 | scoped); | |
361 | rcu_read_unlock(); | |
362 | ||
83ba4645 | 363 | if (!(ipv6_can_nonlocal_bind(net, isk) || has_addr || |
6d0bfe22 LC |
364 | addr_type == IPV6_ADDR_ANY)) |
365 | return -EADDRNOTAVAIL; | |
366 | ||
367 | if (scoped) | |
368 | sk->sk_bound_dev_if = addr->sin6_scope_id; | |
369 | #endif | |
370 | } else { | |
371 | return -EAFNOSUPPORT; | |
372 | } | |
373 | return 0; | |
374 | } | |
375 | ||
a06a2d37 | 376 | static void ping_set_saddr(struct sock *sk, struct sockaddr *saddr) |
6d0bfe22 LC |
377 | { |
378 | if (saddr->sa_family == AF_INET) { | |
379 | struct inet_sock *isk = inet_sk(sk); | |
380 | struct sockaddr_in *addr = (struct sockaddr_in *) saddr; | |
381 | isk->inet_rcv_saddr = isk->inet_saddr = addr->sin_addr.s_addr; | |
382 | #if IS_ENABLED(CONFIG_IPV6) | |
383 | } else if (saddr->sa_family == AF_INET6) { | |
384 | struct sockaddr_in6 *addr = (struct sockaddr_in6 *) saddr; | |
385 | struct ipv6_pinfo *np = inet6_sk(sk); | |
efe4208f | 386 | sk->sk_v6_rcv_saddr = np->saddr = addr->sin6_addr; |
6d0bfe22 LC |
387 | #endif |
388 | } | |
389 | } | |
c319b4d7 | 390 | |
a06a2d37 | 391 | static void ping_clear_saddr(struct sock *sk, int dif) |
6d0bfe22 LC |
392 | { |
393 | sk->sk_bound_dev_if = dif; | |
394 | if (sk->sk_family == AF_INET) { | |
395 | struct inet_sock *isk = inet_sk(sk); | |
396 | isk->inet_rcv_saddr = isk->inet_saddr = 0; | |
397 | #if IS_ENABLED(CONFIG_IPV6) | |
398 | } else if (sk->sk_family == AF_INET6) { | |
399 | struct ipv6_pinfo *np = inet6_sk(sk); | |
efe4208f | 400 | memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr)); |
6d0bfe22 LC |
401 | memset(&np->saddr, 0, sizeof(np->saddr)); |
402 | #endif | |
403 | } | |
404 | } | |
c319b4d7 VK |
405 | /* |
406 | * We need our own bind because there are no privileged id's == local ports. | |
407 | * Moreover, we don't allow binding to multi- and broadcast addresses. | |
408 | */ | |
409 | ||
6d0bfe22 | 410 | int ping_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) |
c319b4d7 | 411 | { |
c319b4d7 VK |
412 | struct inet_sock *isk = inet_sk(sk); |
413 | unsigned short snum; | |
c319b4d7 | 414 | int err; |
6d0bfe22 | 415 | int dif = sk->sk_bound_dev_if; |
c319b4d7 | 416 | |
6d0bfe22 LC |
417 | err = ping_check_bind_addr(sk, isk, uaddr, addr_len); |
418 | if (err) | |
419 | return err; | |
c319b4d7 VK |
420 | |
421 | lock_sock(sk); | |
422 | ||
423 | err = -EINVAL; | |
424 | if (isk->inet_num != 0) | |
425 | goto out; | |
426 | ||
427 | err = -EADDRINUSE; | |
6d0bfe22 LC |
428 | ping_set_saddr(sk, uaddr); |
429 | snum = ntohs(((struct sockaddr_in *)uaddr)->sin_port); | |
430 | if (ping_get_port(sk, snum) != 0) { | |
431 | ping_clear_saddr(sk, dif); | |
c319b4d7 VK |
432 | goto out; |
433 | } | |
434 | ||
a7ef6715 GF |
435 | pr_debug("after bind(): num = %hu, dif = %d\n", |
436 | isk->inet_num, | |
437 | sk->sk_bound_dev_if); | |
c319b4d7 VK |
438 | |
439 | err = 0; | |
c2bb06db | 440 | if (sk->sk_family == AF_INET && isk->inet_rcv_saddr) |
c319b4d7 | 441 | sk->sk_userlocks |= SOCK_BINDADDR_LOCK; |
c2bb06db ED |
442 | #if IS_ENABLED(CONFIG_IPV6) |
443 | if (sk->sk_family == AF_INET6 && !ipv6_addr_any(&sk->sk_v6_rcv_saddr)) | |
444 | sk->sk_userlocks |= SOCK_BINDADDR_LOCK; | |
445 | #endif | |
6d0bfe22 | 446 | |
c319b4d7 VK |
447 | if (snum) |
448 | sk->sk_userlocks |= SOCK_BINDPORT_LOCK; | |
449 | isk->inet_sport = htons(isk->inet_num); | |
450 | isk->inet_daddr = 0; | |
451 | isk->inet_dport = 0; | |
6d0bfe22 LC |
452 | |
453 | #if IS_ENABLED(CONFIG_IPV6) | |
454 | if (sk->sk_family == AF_INET6) | |
efe4208f | 455 | memset(&sk->sk_v6_daddr, 0, sizeof(sk->sk_v6_daddr)); |
6d0bfe22 LC |
456 | #endif |
457 | ||
c319b4d7 VK |
458 | sk_dst_reset(sk); |
459 | out: | |
460 | release_sock(sk); | |
461 | pr_debug("ping_v4_bind -> %d\n", err); | |
462 | return err; | |
463 | } | |
6d0bfe22 | 464 | EXPORT_SYMBOL_GPL(ping_bind); |
c319b4d7 VK |
465 | |
466 | /* | |
467 | * Is this a supported type of ICMP message? | |
468 | */ | |
469 | ||
6d0bfe22 | 470 | static inline int ping_supported(int family, int type, int code) |
c319b4d7 | 471 | { |
6d0bfe22 LC |
472 | return (family == AF_INET && type == ICMP_ECHO && code == 0) || |
473 | (family == AF_INET6 && type == ICMPV6_ECHO_REQUEST && code == 0); | |
c319b4d7 VK |
474 | } |
475 | ||
476 | /* | |
477 | * This routine is called by the ICMP module when it gets some | |
478 | * sort of error condition. | |
479 | */ | |
480 | ||
6d0bfe22 | 481 | void ping_err(struct sk_buff *skb, int offset, u32 info) |
c319b4d7 | 482 | { |
6d0bfe22 LC |
483 | int family; |
484 | struct icmphdr *icmph; | |
c319b4d7 | 485 | struct inet_sock *inet_sock; |
6d0bfe22 LC |
486 | int type; |
487 | int code; | |
c319b4d7 VK |
488 | struct net *net = dev_net(skb->dev); |
489 | struct sock *sk; | |
490 | int harderr; | |
491 | int err; | |
492 | ||
6d0bfe22 LC |
493 | if (skb->protocol == htons(ETH_P_IP)) { |
494 | family = AF_INET; | |
495 | type = icmp_hdr(skb)->type; | |
496 | code = icmp_hdr(skb)->code; | |
497 | icmph = (struct icmphdr *)(skb->data + offset); | |
498 | } else if (skb->protocol == htons(ETH_P_IPV6)) { | |
499 | family = AF_INET6; | |
500 | type = icmp6_hdr(skb)->icmp6_type; | |
501 | code = icmp6_hdr(skb)->icmp6_code; | |
502 | icmph = (struct icmphdr *) (skb->data + offset); | |
503 | } else { | |
504 | BUG(); | |
505 | } | |
506 | ||
c319b4d7 VK |
507 | /* We assume the packet has already been checked by icmp_unreach */ |
508 | ||
6d0bfe22 | 509 | if (!ping_supported(family, icmph->type, icmph->code)) |
c319b4d7 VK |
510 | return; |
511 | ||
6d0bfe22 LC |
512 | pr_debug("ping_err(proto=0x%x,type=%d,code=%d,id=%04x,seq=%04x)\n", |
513 | skb->protocol, type, code, ntohs(icmph->un.echo.id), | |
514 | ntohs(icmph->un.echo.sequence)); | |
c319b4d7 | 515 | |
6d0bfe22 | 516 | sk = ping_lookup(net, skb, ntohs(icmph->un.echo.id)); |
51456b29 | 517 | if (!sk) { |
c319b4d7 VK |
518 | pr_debug("no socket, dropping\n"); |
519 | return; /* No socket for error */ | |
520 | } | |
521 | pr_debug("err on socket %p\n", sk); | |
522 | ||
523 | err = 0; | |
524 | harderr = 0; | |
525 | inet_sock = inet_sk(sk); | |
526 | ||
6d0bfe22 LC |
527 | if (skb->protocol == htons(ETH_P_IP)) { |
528 | switch (type) { | |
529 | default: | |
530 | case ICMP_TIME_EXCEEDED: | |
531 | err = EHOSTUNREACH; | |
532 | break; | |
533 | case ICMP_SOURCE_QUENCH: | |
534 | /* This is not a real error but ping wants to see it. | |
535 | * Report it with some fake errno. | |
536 | */ | |
537 | err = EREMOTEIO; | |
538 | break; | |
539 | case ICMP_PARAMETERPROB: | |
540 | err = EPROTO; | |
541 | harderr = 1; | |
542 | break; | |
543 | case ICMP_DEST_UNREACH: | |
544 | if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */ | |
545 | ipv4_sk_update_pmtu(skb, sk, info); | |
546 | if (inet_sock->pmtudisc != IP_PMTUDISC_DONT) { | |
547 | err = EMSGSIZE; | |
548 | harderr = 1; | |
549 | break; | |
550 | } | |
551 | goto out; | |
c319b4d7 | 552 | } |
6d0bfe22 LC |
553 | err = EHOSTUNREACH; |
554 | if (code <= NR_ICMP_UNREACH) { | |
555 | harderr = icmp_err_convert[code].fatal; | |
556 | err = icmp_err_convert[code].errno; | |
557 | } | |
558 | break; | |
559 | case ICMP_REDIRECT: | |
560 | /* See ICMP_SOURCE_QUENCH */ | |
561 | ipv4_sk_redirect(skb, sk); | |
562 | err = EREMOTEIO; | |
563 | break; | |
c319b4d7 | 564 | } |
6d0bfe22 LC |
565 | #if IS_ENABLED(CONFIG_IPV6) |
566 | } else if (skb->protocol == htons(ETH_P_IPV6)) { | |
567 | harderr = pingv6_ops.icmpv6_err_convert(type, code, &err); | |
568 | #endif | |
c319b4d7 VK |
569 | } |
570 | ||
571 | /* | |
572 | * RFC1122: OK. Passes ICMP errors back to application, as per | |
573 | * 4.1.3.3. | |
574 | */ | |
6d0bfe22 LC |
575 | if ((family == AF_INET && !inet_sock->recverr) || |
576 | (family == AF_INET6 && !inet6_sk(sk)->recverr)) { | |
c319b4d7 VK |
577 | if (!harderr || sk->sk_state != TCP_ESTABLISHED) |
578 | goto out; | |
579 | } else { | |
6d0bfe22 LC |
580 | if (family == AF_INET) { |
581 | ip_icmp_error(sk, skb, err, 0 /* no remote port */, | |
582 | info, (u8 *)icmph); | |
583 | #if IS_ENABLED(CONFIG_IPV6) | |
584 | } else if (family == AF_INET6) { | |
585 | pingv6_ops.ipv6_icmp_error(sk, skb, err, 0, | |
586 | info, (u8 *)icmph); | |
587 | #endif | |
588 | } | |
c319b4d7 VK |
589 | } |
590 | sk->sk_err = err; | |
591 | sk->sk_error_report(sk); | |
592 | out: | |
593 | sock_put(sk); | |
594 | } | |
6d0bfe22 | 595 | EXPORT_SYMBOL_GPL(ping_err); |
c319b4d7 VK |
596 | |
597 | /* | |
6d0bfe22 LC |
598 | * Copy and checksum an ICMP Echo packet from user space into a buffer |
599 | * starting from the payload. | |
c319b4d7 VK |
600 | */ |
601 | ||
6d0bfe22 LC |
602 | int ping_getfrag(void *from, char *to, |
603 | int offset, int fraglen, int odd, struct sk_buff *skb) | |
c319b4d7 VK |
604 | { |
605 | struct pingfakehdr *pfh = (struct pingfakehdr *)from; | |
606 | ||
607 | if (offset == 0) { | |
21226abb AV |
608 | fraglen -= sizeof(struct icmphdr); |
609 | if (fraglen < 0) | |
c319b4d7 | 610 | BUG(); |
0b62fca2 | 611 | if (!csum_and_copy_from_iter_full(to + sizeof(struct icmphdr), |
21226abb | 612 | fraglen, &pfh->wcheck, |
0b62fca2 | 613 | &pfh->msg->msg_iter)) |
c319b4d7 | 614 | return -EFAULT; |
6d0bfe22 LC |
615 | } else if (offset < sizeof(struct icmphdr)) { |
616 | BUG(); | |
617 | } else { | |
0b62fca2 AV |
618 | if (!csum_and_copy_from_iter_full(to, fraglen, &pfh->wcheck, |
619 | &pfh->msg->msg_iter)) | |
6d0bfe22 LC |
620 | return -EFAULT; |
621 | } | |
c319b4d7 | 622 | |
6d0bfe22 LC |
623 | #if IS_ENABLED(CONFIG_IPV6) |
624 | /* For IPv6, checksum each skb as we go along, as expected by | |
625 | * icmpv6_push_pending_frames. For IPv4, accumulate the checksum in | |
626 | * wcheck, it will be finalized in ping_v4_push_pending_frames. | |
627 | */ | |
628 | if (pfh->family == AF_INET6) { | |
629 | skb->csum = pfh->wcheck; | |
630 | skb->ip_summed = CHECKSUM_NONE; | |
631 | pfh->wcheck = 0; | |
c319b4d7 | 632 | } |
6d0bfe22 LC |
633 | #endif |
634 | ||
c319b4d7 VK |
635 | return 0; |
636 | } | |
6d0bfe22 | 637 | EXPORT_SYMBOL_GPL(ping_getfrag); |
c319b4d7 | 638 | |
6d0bfe22 LC |
639 | static int ping_v4_push_pending_frames(struct sock *sk, struct pingfakehdr *pfh, |
640 | struct flowi4 *fl4) | |
c319b4d7 VK |
641 | { |
642 | struct sk_buff *skb = skb_peek(&sk->sk_write_queue); | |
643 | ||
73d2c667 WC |
644 | if (!skb) |
645 | return 0; | |
c319b4d7 VK |
646 | pfh->wcheck = csum_partial((char *)&pfh->icmph, |
647 | sizeof(struct icmphdr), pfh->wcheck); | |
648 | pfh->icmph.checksum = csum_fold(pfh->wcheck); | |
649 | memcpy(icmp_hdr(skb), &pfh->icmph, sizeof(struct icmphdr)); | |
650 | skb->ip_summed = CHECKSUM_NONE; | |
651 | return ip_push_pending_frames(sk, fl4); | |
652 | } | |
653 | ||
6d0bfe22 LC |
654 | int ping_common_sendmsg(int family, struct msghdr *msg, size_t len, |
655 | void *user_icmph, size_t icmph_len) { | |
656 | u8 type, code; | |
c319b4d7 VK |
657 | |
658 | if (len > 0xFFFF) | |
659 | return -EMSGSIZE; | |
660 | ||
0eab121e KC |
661 | /* Must have at least a full ICMP header. */ |
662 | if (len < icmph_len) | |
663 | return -EINVAL; | |
664 | ||
c319b4d7 VK |
665 | /* |
666 | * Check the flags. | |
667 | */ | |
668 | ||
669 | /* Mirror BSD error message compatibility */ | |
670 | if (msg->msg_flags & MSG_OOB) | |
671 | return -EOPNOTSUPP; | |
672 | ||
673 | /* | |
674 | * Fetch the ICMP header provided by the userland. | |
6d0bfe22 | 675 | * iovec is modified! The ICMP header is consumed. |
c319b4d7 | 676 | */ |
6ce8e9ce | 677 | if (memcpy_from_msg(user_icmph, msg, icmph_len)) |
c319b4d7 | 678 | return -EFAULT; |
6d0bfe22 LC |
679 | |
680 | if (family == AF_INET) { | |
681 | type = ((struct icmphdr *) user_icmph)->type; | |
682 | code = ((struct icmphdr *) user_icmph)->code; | |
683 | #if IS_ENABLED(CONFIG_IPV6) | |
684 | } else if (family == AF_INET6) { | |
685 | type = ((struct icmp6hdr *) user_icmph)->icmp6_type; | |
686 | code = ((struct icmp6hdr *) user_icmph)->icmp6_code; | |
687 | #endif | |
688 | } else { | |
689 | BUG(); | |
690 | } | |
691 | ||
692 | if (!ping_supported(family, type, code)) | |
c319b4d7 VK |
693 | return -EINVAL; |
694 | ||
6d0bfe22 LC |
695 | return 0; |
696 | } | |
697 | EXPORT_SYMBOL_GPL(ping_common_sendmsg); | |
698 | ||
1b784140 | 699 | static int ping_v4_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) |
6d0bfe22 LC |
700 | { |
701 | struct net *net = sock_net(sk); | |
702 | struct flowi4 fl4; | |
703 | struct inet_sock *inet = inet_sk(sk); | |
704 | struct ipcm_cookie ipc; | |
705 | struct icmphdr user_icmph; | |
706 | struct pingfakehdr pfh; | |
707 | struct rtable *rt = NULL; | |
708 | struct ip_options_data opt_copy; | |
709 | int free = 0; | |
710 | __be32 saddr, daddr, faddr; | |
711 | u8 tos; | |
712 | int err; | |
713 | ||
714 | pr_debug("ping_v4_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num); | |
715 | ||
716 | err = ping_common_sendmsg(AF_INET, msg, len, &user_icmph, | |
717 | sizeof(user_icmph)); | |
718 | if (err) | |
719 | return err; | |
720 | ||
c319b4d7 VK |
721 | /* |
722 | * Get and verify the address. | |
723 | */ | |
724 | ||
725 | if (msg->msg_name) { | |
342dfc30 | 726 | DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name); |
c319b4d7 VK |
727 | if (msg->msg_namelen < sizeof(*usin)) |
728 | return -EINVAL; | |
729 | if (usin->sin_family != AF_INET) | |
9145736d | 730 | return -EAFNOSUPPORT; |
c319b4d7 VK |
731 | daddr = usin->sin_addr.s_addr; |
732 | /* no remote port */ | |
733 | } else { | |
734 | if (sk->sk_state != TCP_ESTABLISHED) | |
735 | return -EDESTADDRREQ; | |
736 | daddr = inet->inet_daddr; | |
737 | /* no remote port */ | |
738 | } | |
739 | ||
35178206 | 740 | ipcm_init_sk(&ipc, inet); |
bf84a010 | 741 | |
c319b4d7 | 742 | if (msg->msg_controllen) { |
24025c46 | 743 | err = ip_cmsg_send(sk, msg, &ipc, false); |
91948309 ED |
744 | if (unlikely(err)) { |
745 | kfree(ipc.opt); | |
c319b4d7 | 746 | return err; |
91948309 | 747 | } |
c319b4d7 VK |
748 | if (ipc.opt) |
749 | free = 1; | |
750 | } | |
751 | if (!ipc.opt) { | |
752 | struct ip_options_rcu *inet_opt; | |
753 | ||
754 | rcu_read_lock(); | |
755 | inet_opt = rcu_dereference(inet->inet_opt); | |
756 | if (inet_opt) { | |
757 | memcpy(&opt_copy, inet_opt, | |
758 | sizeof(*inet_opt) + inet_opt->opt.optlen); | |
759 | ipc.opt = &opt_copy.opt; | |
760 | } | |
761 | rcu_read_unlock(); | |
762 | } | |
763 | ||
764 | saddr = ipc.addr; | |
765 | ipc.addr = faddr = daddr; | |
766 | ||
767 | if (ipc.opt && ipc.opt->opt.srr) { | |
1b97013b AI |
768 | if (!daddr) { |
769 | err = -EINVAL; | |
770 | goto out_free; | |
771 | } | |
c319b4d7 VK |
772 | faddr = ipc.opt->opt.faddr; |
773 | } | |
aa661581 | 774 | tos = get_rttos(&ipc, inet); |
c319b4d7 VK |
775 | if (sock_flag(sk, SOCK_LOCALROUTE) || |
776 | (msg->msg_flags & MSG_DONTROUTE) || | |
777 | (ipc.opt && ipc.opt->opt.is_strictroute)) { | |
778 | tos |= RTO_ONLINK; | |
779 | } | |
780 | ||
781 | if (ipv4_is_multicast(daddr)) { | |
854da991 | 782 | if (!ipc.oif || netif_index_is_l3_master(sock_net(sk), ipc.oif)) |
c319b4d7 VK |
783 | ipc.oif = inet->mc_index; |
784 | if (!saddr) | |
785 | saddr = inet->mc_addr; | |
76e21053 EH |
786 | } else if (!ipc.oif) |
787 | ipc.oif = inet->uc_index; | |
c319b4d7 VK |
788 | |
789 | flowi4_init_output(&fl4, ipc.oif, sk->sk_mark, tos, | |
790 | RT_SCOPE_UNIVERSE, sk->sk_protocol, | |
e2d118a1 LC |
791 | inet_sk_flowi_flags(sk), faddr, saddr, 0, 0, |
792 | sk->sk_uid); | |
c319b4d7 VK |
793 | |
794 | security_sk_classify_flow(sk, flowi4_to_flowi(&fl4)); | |
795 | rt = ip_route_output_flow(net, &fl4, sk); | |
796 | if (IS_ERR(rt)) { | |
797 | err = PTR_ERR(rt); | |
798 | rt = NULL; | |
799 | if (err == -ENETUNREACH) | |
f1d8cba6 | 800 | IP_INC_STATS(net, IPSTATS_MIB_OUTNOROUTES); |
c319b4d7 VK |
801 | goto out; |
802 | } | |
803 | ||
804 | err = -EACCES; | |
805 | if ((rt->rt_flags & RTCF_BROADCAST) && | |
806 | !sock_flag(sk, SOCK_BROADCAST)) | |
807 | goto out; | |
808 | ||
809 | if (msg->msg_flags & MSG_CONFIRM) | |
810 | goto do_confirm; | |
811 | back_from_confirm: | |
812 | ||
813 | if (!ipc.addr) | |
814 | ipc.addr = fl4.daddr; | |
815 | ||
816 | lock_sock(sk); | |
817 | ||
818 | pfh.icmph.type = user_icmph.type; /* already checked */ | |
819 | pfh.icmph.code = user_icmph.code; /* ditto */ | |
820 | pfh.icmph.checksum = 0; | |
821 | pfh.icmph.un.echo.id = inet->inet_sport; | |
822 | pfh.icmph.un.echo.sequence = user_icmph.un.echo.sequence; | |
cacdc7d2 | 823 | pfh.msg = msg; |
c319b4d7 | 824 | pfh.wcheck = 0; |
6d0bfe22 | 825 | pfh.family = AF_INET; |
c319b4d7 VK |
826 | |
827 | err = ip_append_data(sk, &fl4, ping_getfrag, &pfh, len, | |
828 | 0, &ipc, &rt, msg->msg_flags); | |
829 | if (err) | |
830 | ip_flush_pending_frames(sk); | |
831 | else | |
6d0bfe22 | 832 | err = ping_v4_push_pending_frames(sk, &pfh, &fl4); |
c319b4d7 VK |
833 | release_sock(sk); |
834 | ||
835 | out: | |
836 | ip_rt_put(rt); | |
1b97013b | 837 | out_free: |
c319b4d7 VK |
838 | if (free) |
839 | kfree(ipc.opt); | |
840 | if (!err) { | |
841 | icmp_out_count(sock_net(sk), user_icmph.type); | |
842 | return len; | |
843 | } | |
844 | return err; | |
845 | ||
846 | do_confirm: | |
0dec879f JA |
847 | if (msg->msg_flags & MSG_PROBE) |
848 | dst_confirm_neigh(&rt->dst, &fl4.daddr); | |
c319b4d7 VK |
849 | if (!(msg->msg_flags & MSG_PROBE) || len) |
850 | goto back_from_confirm; | |
851 | err = 0; | |
852 | goto out; | |
853 | } | |
854 | ||
1b784140 YX |
855 | int ping_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int noblock, |
856 | int flags, int *addr_len) | |
c319b4d7 VK |
857 | { |
858 | struct inet_sock *isk = inet_sk(sk); | |
6d0bfe22 | 859 | int family = sk->sk_family; |
c319b4d7 VK |
860 | struct sk_buff *skb; |
861 | int copied, err; | |
862 | ||
863 | pr_debug("ping_recvmsg(sk=%p,sk->num=%u)\n", isk, isk->inet_num); | |
864 | ||
a5e7424d | 865 | err = -EOPNOTSUPP; |
c319b4d7 VK |
866 | if (flags & MSG_OOB) |
867 | goto out; | |
868 | ||
f4713a3d WB |
869 | if (flags & MSG_ERRQUEUE) |
870 | return inet_recv_error(sk, msg, len, addr_len); | |
c319b4d7 VK |
871 | |
872 | skb = skb_recv_datagram(sk, flags, noblock, &err); | |
873 | if (!skb) | |
874 | goto out; | |
875 | ||
876 | copied = skb->len; | |
877 | if (copied > len) { | |
878 | msg->msg_flags |= MSG_TRUNC; | |
879 | copied = len; | |
880 | } | |
881 | ||
882 | /* Don't bother checking the checksum */ | |
51f3d02b | 883 | err = skb_copy_datagram_msg(skb, 0, msg, copied); |
c319b4d7 VK |
884 | if (err) |
885 | goto done; | |
886 | ||
887 | sock_recv_timestamp(msg, sk, skb); | |
888 | ||
6d0bfe22 LC |
889 | /* Copy the address and add cmsg data. */ |
890 | if (family == AF_INET) { | |
342dfc30 | 891 | DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); |
bceaa902 | 892 | |
cf970c00 HFS |
893 | if (sin) { |
894 | sin->sin_family = AF_INET; | |
895 | sin->sin_port = 0 /* skb->h.uh->source */; | |
896 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; | |
897 | memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
898 | *addr_len = sizeof(*sin); | |
899 | } | |
6d0bfe22 LC |
900 | |
901 | if (isk->cmsg_flags) | |
902 | ip_cmsg_recv(msg, skb); | |
903 | ||
904 | #if IS_ENABLED(CONFIG_IPV6) | |
905 | } else if (family == AF_INET6) { | |
906 | struct ipv6_pinfo *np = inet6_sk(sk); | |
907 | struct ipv6hdr *ip6 = ipv6_hdr(skb); | |
342dfc30 | 908 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); |
bceaa902 | 909 | |
cf970c00 HFS |
910 | if (sin6) { |
911 | sin6->sin6_family = AF_INET6; | |
912 | sin6->sin6_port = 0; | |
913 | sin6->sin6_addr = ip6->saddr; | |
914 | sin6->sin6_flowinfo = 0; | |
915 | if (np->sndflow) | |
916 | sin6->sin6_flowinfo = ip6_flowinfo(ip6); | |
917 | sin6->sin6_scope_id = | |
918 | ipv6_iface_scope_id(&sin6->sin6_addr, | |
4330487a | 919 | inet6_iif(skb)); |
cf970c00 HFS |
920 | *addr_len = sizeof(*sin6); |
921 | } | |
6d0bfe22 LC |
922 | |
923 | if (inet6_sk(sk)->rxopt.all) | |
4b261c75 HFS |
924 | pingv6_ops.ip6_datagram_recv_common_ctl(sk, msg, skb); |
925 | if (skb->protocol == htons(ETH_P_IPV6) && | |
926 | inet6_sk(sk)->rxopt.all) | |
927 | pingv6_ops.ip6_datagram_recv_specific_ctl(sk, msg, skb); | |
928 | else if (skb->protocol == htons(ETH_P_IP) && isk->cmsg_flags) | |
929 | ip_cmsg_recv(msg, skb); | |
6d0bfe22 LC |
930 | #endif |
931 | } else { | |
932 | BUG(); | |
c319b4d7 | 933 | } |
6d0bfe22 | 934 | |
c319b4d7 VK |
935 | err = copied; |
936 | ||
937 | done: | |
938 | skb_free_datagram(sk, skb); | |
939 | out: | |
940 | pr_debug("ping_recvmsg -> %d\n", err); | |
941 | return err; | |
942 | } | |
6d0bfe22 | 943 | EXPORT_SYMBOL_GPL(ping_recvmsg); |
c319b4d7 | 944 | |
6d0bfe22 | 945 | int ping_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
c319b4d7 VK |
946 | { |
947 | pr_debug("ping_queue_rcv_skb(sk=%p,sk->num=%d,skb=%p)\n", | |
058bd4d2 | 948 | inet_sk(sk), inet_sk(sk)->inet_num, skb); |
c319b4d7 | 949 | if (sock_queue_rcv_skb(sk, skb) < 0) { |
c319b4d7 VK |
950 | kfree_skb(skb); |
951 | pr_debug("ping_queue_rcv_skb -> failed\n"); | |
952 | return -1; | |
953 | } | |
954 | return 0; | |
955 | } | |
6d0bfe22 | 956 | EXPORT_SYMBOL_GPL(ping_queue_rcv_skb); |
c319b4d7 VK |
957 | |
958 | ||
959 | /* | |
960 | * All we need to do is get the socket. | |
961 | */ | |
962 | ||
e3e32170 | 963 | bool ping_rcv(struct sk_buff *skb) |
c319b4d7 VK |
964 | { |
965 | struct sock *sk; | |
966 | struct net *net = dev_net(skb->dev); | |
c319b4d7 | 967 | struct icmphdr *icmph = icmp_hdr(skb); |
c319b4d7 VK |
968 | |
969 | /* We assume the packet has already been checked by icmp_rcv */ | |
970 | ||
971 | pr_debug("ping_rcv(skb=%p,id=%04x,seq=%04x)\n", | |
058bd4d2 | 972 | skb, ntohs(icmph->un.echo.id), ntohs(icmph->un.echo.sequence)); |
c319b4d7 VK |
973 | |
974 | /* Push ICMP header back */ | |
975 | skb_push(skb, skb->data - (u8 *)icmph); | |
976 | ||
6d0bfe22 | 977 | sk = ping_lookup(net, skb, ntohs(icmph->un.echo.id)); |
00db4124 | 978 | if (sk) { |
fc752f1f | 979 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); |
980 | ||
c319b4d7 | 981 | pr_debug("rcv on socket %p\n", sk); |
fc752f1f | 982 | if (skb2) |
983 | ping_queue_rcv_skb(sk, skb2); | |
c319b4d7 | 984 | sock_put(sk); |
e3e32170 | 985 | return true; |
c319b4d7 VK |
986 | } |
987 | pr_debug("no socket, dropping\n"); | |
988 | ||
e3e32170 | 989 | return false; |
c319b4d7 | 990 | } |
6d0bfe22 | 991 | EXPORT_SYMBOL_GPL(ping_rcv); |
c319b4d7 VK |
992 | |
993 | struct proto ping_prot = { | |
994 | .name = "PING", | |
995 | .owner = THIS_MODULE, | |
996 | .init = ping_init_sock, | |
997 | .close = ping_close, | |
998 | .connect = ip4_datagram_connect, | |
286c72de | 999 | .disconnect = __udp_disconnect, |
c319b4d7 VK |
1000 | .setsockopt = ip_setsockopt, |
1001 | .getsockopt = ip_getsockopt, | |
6d0bfe22 | 1002 | .sendmsg = ping_v4_sendmsg, |
c319b4d7 VK |
1003 | .recvmsg = ping_recvmsg, |
1004 | .bind = ping_bind, | |
1005 | .backlog_rcv = ping_queue_rcv_skb, | |
8141ed9f | 1006 | .release_cb = ip4_datagram_release_cb, |
6d0bfe22 LC |
1007 | .hash = ping_hash, |
1008 | .unhash = ping_unhash, | |
1009 | .get_port = ping_get_port, | |
c319b4d7 VK |
1010 | .obj_size = sizeof(struct inet_sock), |
1011 | }; | |
1012 | EXPORT_SYMBOL(ping_prot); | |
1013 | ||
1014 | #ifdef CONFIG_PROC_FS | |
1015 | ||
1016 | static struct sock *ping_get_first(struct seq_file *seq, int start) | |
1017 | { | |
1018 | struct sock *sk; | |
1019 | struct ping_iter_state *state = seq->private; | |
1020 | struct net *net = seq_file_net(seq); | |
1021 | ||
1022 | for (state->bucket = start; state->bucket < PING_HTABLE_SIZE; | |
1023 | ++state->bucket) { | |
1024 | struct hlist_nulls_node *node; | |
75e308c8 CG |
1025 | struct hlist_nulls_head *hslot; |
1026 | ||
1027 | hslot = &ping_table.hash[state->bucket]; | |
c319b4d7 VK |
1028 | |
1029 | if (hlist_nulls_empty(hslot)) | |
1030 | continue; | |
1031 | ||
1032 | sk_nulls_for_each(sk, node, hslot) { | |
8cc785f6 LC |
1033 | if (net_eq(sock_net(sk), net) && |
1034 | sk->sk_family == state->family) | |
c319b4d7 VK |
1035 | goto found; |
1036 | } | |
1037 | } | |
1038 | sk = NULL; | |
1039 | found: | |
1040 | return sk; | |
1041 | } | |
1042 | ||
1043 | static struct sock *ping_get_next(struct seq_file *seq, struct sock *sk) | |
1044 | { | |
1045 | struct ping_iter_state *state = seq->private; | |
1046 | struct net *net = seq_file_net(seq); | |
1047 | ||
1048 | do { | |
1049 | sk = sk_nulls_next(sk); | |
1050 | } while (sk && (!net_eq(sock_net(sk), net))); | |
1051 | ||
1052 | if (!sk) | |
1053 | return ping_get_first(seq, state->bucket + 1); | |
1054 | return sk; | |
1055 | } | |
1056 | ||
1057 | static struct sock *ping_get_idx(struct seq_file *seq, loff_t pos) | |
1058 | { | |
1059 | struct sock *sk = ping_get_first(seq, 0); | |
1060 | ||
1061 | if (sk) | |
1062 | while (pos && (sk = ping_get_next(seq, sk)) != NULL) | |
1063 | --pos; | |
1064 | return pos ? NULL : sk; | |
1065 | } | |
1066 | ||
d862e546 | 1067 | void *ping_seq_start(struct seq_file *seq, loff_t *pos, sa_family_t family) |
ad64b8be | 1068 | __acquires(ping_table.lock) |
c319b4d7 VK |
1069 | { |
1070 | struct ping_iter_state *state = seq->private; | |
1071 | state->bucket = 0; | |
8cc785f6 | 1072 | state->family = family; |
c319b4d7 VK |
1073 | |
1074 | read_lock_bh(&ping_table.lock); | |
1075 | ||
1076 | return *pos ? ping_get_idx(seq, *pos-1) : SEQ_START_TOKEN; | |
1077 | } | |
d862e546 | 1078 | EXPORT_SYMBOL_GPL(ping_seq_start); |
c319b4d7 | 1079 | |
8cc785f6 LC |
1080 | static void *ping_v4_seq_start(struct seq_file *seq, loff_t *pos) |
1081 | { | |
1082 | return ping_seq_start(seq, pos, AF_INET); | |
1083 | } | |
1084 | ||
d862e546 | 1085 | void *ping_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
c319b4d7 VK |
1086 | { |
1087 | struct sock *sk; | |
1088 | ||
1089 | if (v == SEQ_START_TOKEN) | |
1090 | sk = ping_get_idx(seq, 0); | |
1091 | else | |
1092 | sk = ping_get_next(seq, v); | |
1093 | ||
1094 | ++*pos; | |
1095 | return sk; | |
1096 | } | |
d862e546 | 1097 | EXPORT_SYMBOL_GPL(ping_seq_next); |
c319b4d7 | 1098 | |
d862e546 | 1099 | void ping_seq_stop(struct seq_file *seq, void *v) |
ad64b8be | 1100 | __releases(ping_table.lock) |
c319b4d7 VK |
1101 | { |
1102 | read_unlock_bh(&ping_table.lock); | |
1103 | } | |
d862e546 | 1104 | EXPORT_SYMBOL_GPL(ping_seq_stop); |
c319b4d7 | 1105 | |
8cc785f6 | 1106 | static void ping_v4_format_sock(struct sock *sp, struct seq_file *f, |
652586df | 1107 | int bucket) |
c319b4d7 VK |
1108 | { |
1109 | struct inet_sock *inet = inet_sk(sp); | |
1110 | __be32 dest = inet->inet_daddr; | |
1111 | __be32 src = inet->inet_rcv_saddr; | |
1112 | __u16 destp = ntohs(inet->inet_dport); | |
1113 | __u16 srcp = ntohs(inet->inet_sport); | |
1114 | ||
1115 | seq_printf(f, "%5d: %08X:%04X %08X:%04X" | |
652586df | 1116 | " %02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d", |
c319b4d7 VK |
1117 | bucket, src, srcp, dest, destp, sp->sk_state, |
1118 | sk_wmem_alloc_get(sp), | |
1119 | sk_rmem_alloc_get(sp), | |
a7cb5a49 EB |
1120 | 0, 0L, 0, |
1121 | from_kuid_munged(seq_user_ns(f), sock_i_uid(sp)), | |
1122 | 0, sock_i_ino(sp), | |
41c6d650 | 1123 | refcount_read(&sp->sk_refcnt), sp, |
652586df | 1124 | atomic_read(&sp->sk_drops)); |
c319b4d7 VK |
1125 | } |
1126 | ||
8cc785f6 | 1127 | static int ping_v4_seq_show(struct seq_file *seq, void *v) |
c319b4d7 | 1128 | { |
652586df | 1129 | seq_setwidth(seq, 127); |
c319b4d7 | 1130 | if (v == SEQ_START_TOKEN) |
652586df | 1131 | seq_puts(seq, " sl local_address rem_address st tx_queue " |
c319b4d7 VK |
1132 | "rx_queue tr tm->when retrnsmt uid timeout " |
1133 | "inode ref pointer drops"); | |
1134 | else { | |
1135 | struct ping_iter_state *state = seq->private; | |
c319b4d7 | 1136 | |
652586df | 1137 | ping_v4_format_sock(v, seq, state->bucket); |
c319b4d7 | 1138 | } |
652586df | 1139 | seq_pad(seq, '\n'); |
c319b4d7 VK |
1140 | return 0; |
1141 | } | |
1142 | ||
f4550221 CH |
1143 | static const struct seq_operations ping_v4_seq_ops = { |
1144 | .start = ping_v4_seq_start, | |
1145 | .show = ping_v4_seq_show, | |
1146 | .next = ping_seq_next, | |
1147 | .stop = ping_seq_stop, | |
1148 | }; | |
1149 | ||
f4550221 | 1150 | static int __net_init ping_v4_proc_init_net(struct net *net) |
c319b4d7 | 1151 | { |
c3506372 CH |
1152 | if (!proc_create_net("icmp", 0444, net->proc_net, &ping_v4_seq_ops, |
1153 | sizeof(struct ping_iter_state))) | |
8cc785f6 LC |
1154 | return -ENOMEM; |
1155 | return 0; | |
c319b4d7 | 1156 | } |
c319b4d7 | 1157 | |
8cc785f6 | 1158 | static void __net_exit ping_v4_proc_exit_net(struct net *net) |
c319b4d7 | 1159 | { |
f4550221 | 1160 | remove_proc_entry("icmp", net->proc_net); |
c319b4d7 VK |
1161 | } |
1162 | ||
8cc785f6 LC |
1163 | static struct pernet_operations ping_v4_net_ops = { |
1164 | .init = ping_v4_proc_init_net, | |
1165 | .exit = ping_v4_proc_exit_net, | |
c319b4d7 VK |
1166 | }; |
1167 | ||
1168 | int __init ping_proc_init(void) | |
1169 | { | |
8cc785f6 | 1170 | return register_pernet_subsys(&ping_v4_net_ops); |
c319b4d7 VK |
1171 | } |
1172 | ||
1173 | void ping_proc_exit(void) | |
1174 | { | |
8cc785f6 | 1175 | unregister_pernet_subsys(&ping_v4_net_ops); |
c319b4d7 VK |
1176 | } |
1177 | ||
1178 | #endif | |
1179 | ||
1180 | void __init ping_init(void) | |
1181 | { | |
1182 | int i; | |
1183 | ||
1184 | for (i = 0; i < PING_HTABLE_SIZE; i++) | |
1185 | INIT_HLIST_NULLS_HEAD(&ping_table.hash[i], i); | |
1186 | rwlock_init(&ping_table.lock); | |
1187 | } |