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 | |
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 | |
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 | |
91a0b603 JZ |
220 | } else { |
221 | continue; | |
6d0bfe22 LC |
222 | } |
223 | ||
c319b4d7 VK |
224 | if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) |
225 | continue; | |
226 | ||
227 | sock_hold(sk); | |
228 | goto exit; | |
229 | } | |
230 | ||
231 | sk = NULL; | |
232 | exit: | |
233 | read_unlock_bh(&ping_table.lock); | |
234 | ||
235 | return sk; | |
236 | } | |
237 | ||
7064d16e EB |
238 | static void inet_get_ping_group_range_net(struct net *net, kgid_t *low, |
239 | kgid_t *high) | |
f56e03e8 | 240 | { |
ba6b918a | 241 | kgid_t *data = net->ipv4.ping_group_range.range; |
95c96174 ED |
242 | unsigned int seq; |
243 | ||
f56e03e8 | 244 | do { |
ba6b918a | 245 | seq = read_seqbegin(&net->ipv4.ping_group_range.lock); |
f56e03e8 VK |
246 | |
247 | *low = data[0]; | |
248 | *high = data[1]; | |
ba6b918a | 249 | } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq)); |
f56e03e8 VK |
250 | } |
251 | ||
252 | ||
6d0bfe22 | 253 | int ping_init_sock(struct sock *sk) |
c319b4d7 VK |
254 | { |
255 | struct net *net = sock_net(sk); | |
7064d16e | 256 | kgid_t group = current_egid(); |
b04c4619 WX |
257 | struct group_info *group_info; |
258 | int i, j, count; | |
ae2975bc | 259 | kgid_t low, high; |
b04c4619 | 260 | int ret = 0; |
c319b4d7 | 261 | |
9145736d LC |
262 | if (sk->sk_family == AF_INET6) |
263 | sk->sk_ipv6only = 1; | |
264 | ||
7064d16e EB |
265 | inet_get_ping_group_range_net(net, &low, &high); |
266 | if (gid_lte(low, group) && gid_lte(group, high)) | |
c319b4d7 VK |
267 | return 0; |
268 | ||
b04c4619 WX |
269 | group_info = get_current_groups(); |
270 | count = group_info->ngroups; | |
c319b4d7 VK |
271 | for (i = 0; i < group_info->nblocks; i++) { |
272 | int cp_count = min_t(int, NGROUPS_PER_BLOCK, count); | |
c319b4d7 | 273 | for (j = 0; j < cp_count; j++) { |
ae2975bc EB |
274 | kgid_t gid = group_info->blocks[i][j]; |
275 | if (gid_lte(low, gid) && gid_lte(gid, high)) | |
b04c4619 | 276 | goto out_release_group; |
c319b4d7 VK |
277 | } |
278 | ||
279 | count -= cp_count; | |
280 | } | |
281 | ||
b04c4619 WX |
282 | ret = -EACCES; |
283 | ||
284 | out_release_group: | |
285 | put_group_info(group_info); | |
286 | return ret; | |
c319b4d7 | 287 | } |
6d0bfe22 | 288 | EXPORT_SYMBOL_GPL(ping_init_sock); |
c319b4d7 | 289 | |
6d0bfe22 | 290 | void ping_close(struct sock *sk, long timeout) |
c319b4d7 VK |
291 | { |
292 | pr_debug("ping_close(sk=%p,sk->num=%u)\n", | |
058bd4d2 | 293 | inet_sk(sk), inet_sk(sk)->inet_num); |
c319b4d7 VK |
294 | pr_debug("isk->refcnt = %d\n", sk->sk_refcnt.counter); |
295 | ||
296 | sk_common_release(sk); | |
297 | } | |
6d0bfe22 LC |
298 | EXPORT_SYMBOL_GPL(ping_close); |
299 | ||
300 | /* Checks the bind address and possibly modifies sk->sk_bound_dev_if. */ | |
a06a2d37 WF |
301 | static int ping_check_bind_addr(struct sock *sk, struct inet_sock *isk, |
302 | struct sockaddr *uaddr, int addr_len) { | |
6d0bfe22 LC |
303 | struct net *net = sock_net(sk); |
304 | if (sk->sk_family == AF_INET) { | |
305 | struct sockaddr_in *addr = (struct sockaddr_in *) uaddr; | |
306 | int chk_addr_ret; | |
307 | ||
308 | if (addr_len < sizeof(*addr)) | |
309 | return -EINVAL; | |
310 | ||
9145736d LC |
311 | if (addr->sin_family != AF_INET && |
312 | !(addr->sin_family == AF_UNSPEC && | |
313 | addr->sin_addr.s_addr == htonl(INADDR_ANY))) | |
314 | return -EAFNOSUPPORT; | |
315 | ||
6d0bfe22 LC |
316 | pr_debug("ping_check_bind_addr(sk=%p,addr=%pI4,port=%d)\n", |
317 | sk, &addr->sin_addr.s_addr, ntohs(addr->sin_port)); | |
318 | ||
319 | chk_addr_ret = inet_addr_type(net, addr->sin_addr.s_addr); | |
320 | ||
321 | if (addr->sin_addr.s_addr == htonl(INADDR_ANY)) | |
322 | chk_addr_ret = RTN_LOCAL; | |
323 | ||
49a60158 | 324 | if ((net->ipv4.sysctl_ip_nonlocal_bind == 0 && |
6d0bfe22 LC |
325 | isk->freebind == 0 && isk->transparent == 0 && |
326 | chk_addr_ret != RTN_LOCAL) || | |
327 | chk_addr_ret == RTN_MULTICAST || | |
328 | chk_addr_ret == RTN_BROADCAST) | |
329 | return -EADDRNOTAVAIL; | |
330 | ||
331 | #if IS_ENABLED(CONFIG_IPV6) | |
332 | } else if (sk->sk_family == AF_INET6) { | |
333 | struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr; | |
334 | int addr_type, scoped, has_addr; | |
335 | struct net_device *dev = NULL; | |
336 | ||
337 | if (addr_len < sizeof(*addr)) | |
338 | return -EINVAL; | |
339 | ||
82b276cd | 340 | if (addr->sin6_family != AF_INET6) |
9145736d | 341 | return -EAFNOSUPPORT; |
82b276cd | 342 | |
6d0bfe22 LC |
343 | pr_debug("ping_check_bind_addr(sk=%p,addr=%pI6c,port=%d)\n", |
344 | sk, addr->sin6_addr.s6_addr, ntohs(addr->sin6_port)); | |
345 | ||
346 | addr_type = ipv6_addr_type(&addr->sin6_addr); | |
347 | scoped = __ipv6_addr_needs_scope_id(addr_type); | |
348 | if ((addr_type != IPV6_ADDR_ANY && | |
349 | !(addr_type & IPV6_ADDR_UNICAST)) || | |
350 | (scoped && !addr->sin6_scope_id)) | |
351 | return -EINVAL; | |
352 | ||
353 | rcu_read_lock(); | |
354 | if (addr->sin6_scope_id) { | |
355 | dev = dev_get_by_index_rcu(net, addr->sin6_scope_id); | |
356 | if (!dev) { | |
357 | rcu_read_unlock(); | |
358 | return -ENODEV; | |
359 | } | |
360 | } | |
361 | has_addr = pingv6_ops.ipv6_chk_addr(net, &addr->sin6_addr, dev, | |
362 | scoped); | |
363 | rcu_read_unlock(); | |
364 | ||
365 | if (!(isk->freebind || isk->transparent || has_addr || | |
366 | addr_type == IPV6_ADDR_ANY)) | |
367 | return -EADDRNOTAVAIL; | |
368 | ||
369 | if (scoped) | |
370 | sk->sk_bound_dev_if = addr->sin6_scope_id; | |
371 | #endif | |
372 | } else { | |
373 | return -EAFNOSUPPORT; | |
374 | } | |
375 | return 0; | |
376 | } | |
377 | ||
a06a2d37 | 378 | static void ping_set_saddr(struct sock *sk, struct sockaddr *saddr) |
6d0bfe22 LC |
379 | { |
380 | if (saddr->sa_family == AF_INET) { | |
381 | struct inet_sock *isk = inet_sk(sk); | |
382 | struct sockaddr_in *addr = (struct sockaddr_in *) saddr; | |
383 | isk->inet_rcv_saddr = isk->inet_saddr = addr->sin_addr.s_addr; | |
384 | #if IS_ENABLED(CONFIG_IPV6) | |
385 | } else if (saddr->sa_family == AF_INET6) { | |
386 | struct sockaddr_in6 *addr = (struct sockaddr_in6 *) saddr; | |
387 | struct ipv6_pinfo *np = inet6_sk(sk); | |
efe4208f | 388 | sk->sk_v6_rcv_saddr = np->saddr = addr->sin6_addr; |
6d0bfe22 LC |
389 | #endif |
390 | } | |
391 | } | |
c319b4d7 | 392 | |
a06a2d37 | 393 | static void ping_clear_saddr(struct sock *sk, int dif) |
6d0bfe22 LC |
394 | { |
395 | sk->sk_bound_dev_if = dif; | |
396 | if (sk->sk_family == AF_INET) { | |
397 | struct inet_sock *isk = inet_sk(sk); | |
398 | isk->inet_rcv_saddr = isk->inet_saddr = 0; | |
399 | #if IS_ENABLED(CONFIG_IPV6) | |
400 | } else if (sk->sk_family == AF_INET6) { | |
401 | struct ipv6_pinfo *np = inet6_sk(sk); | |
efe4208f | 402 | memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr)); |
6d0bfe22 LC |
403 | memset(&np->saddr, 0, sizeof(np->saddr)); |
404 | #endif | |
405 | } | |
406 | } | |
c319b4d7 VK |
407 | /* |
408 | * We need our own bind because there are no privileged id's == local ports. | |
409 | * Moreover, we don't allow binding to multi- and broadcast addresses. | |
410 | */ | |
411 | ||
6d0bfe22 | 412 | int ping_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) |
c319b4d7 | 413 | { |
c319b4d7 VK |
414 | struct inet_sock *isk = inet_sk(sk); |
415 | unsigned short snum; | |
c319b4d7 | 416 | int err; |
6d0bfe22 | 417 | int dif = sk->sk_bound_dev_if; |
c319b4d7 | 418 | |
6d0bfe22 LC |
419 | err = ping_check_bind_addr(sk, isk, uaddr, addr_len); |
420 | if (err) | |
421 | return err; | |
c319b4d7 VK |
422 | |
423 | lock_sock(sk); | |
424 | ||
425 | err = -EINVAL; | |
426 | if (isk->inet_num != 0) | |
427 | goto out; | |
428 | ||
429 | err = -EADDRINUSE; | |
6d0bfe22 LC |
430 | ping_set_saddr(sk, uaddr); |
431 | snum = ntohs(((struct sockaddr_in *)uaddr)->sin_port); | |
432 | if (ping_get_port(sk, snum) != 0) { | |
433 | ping_clear_saddr(sk, dif); | |
c319b4d7 VK |
434 | goto out; |
435 | } | |
436 | ||
6d0bfe22 | 437 | pr_debug("after bind(): num = %d, dif = %d\n", |
058bd4d2 | 438 | (int)isk->inet_num, |
058bd4d2 | 439 | (int)sk->sk_bound_dev_if); |
c319b4d7 VK |
440 | |
441 | err = 0; | |
c2bb06db | 442 | if (sk->sk_family == AF_INET && isk->inet_rcv_saddr) |
c319b4d7 | 443 | sk->sk_userlocks |= SOCK_BINDADDR_LOCK; |
c2bb06db ED |
444 | #if IS_ENABLED(CONFIG_IPV6) |
445 | if (sk->sk_family == AF_INET6 && !ipv6_addr_any(&sk->sk_v6_rcv_saddr)) | |
446 | sk->sk_userlocks |= SOCK_BINDADDR_LOCK; | |
447 | #endif | |
6d0bfe22 | 448 | |
c319b4d7 VK |
449 | if (snum) |
450 | sk->sk_userlocks |= SOCK_BINDPORT_LOCK; | |
451 | isk->inet_sport = htons(isk->inet_num); | |
452 | isk->inet_daddr = 0; | |
453 | isk->inet_dport = 0; | |
6d0bfe22 LC |
454 | |
455 | #if IS_ENABLED(CONFIG_IPV6) | |
456 | if (sk->sk_family == AF_INET6) | |
efe4208f | 457 | memset(&sk->sk_v6_daddr, 0, sizeof(sk->sk_v6_daddr)); |
6d0bfe22 LC |
458 | #endif |
459 | ||
c319b4d7 VK |
460 | sk_dst_reset(sk); |
461 | out: | |
462 | release_sock(sk); | |
463 | pr_debug("ping_v4_bind -> %d\n", err); | |
464 | return err; | |
465 | } | |
6d0bfe22 | 466 | EXPORT_SYMBOL_GPL(ping_bind); |
c319b4d7 VK |
467 | |
468 | /* | |
469 | * Is this a supported type of ICMP message? | |
470 | */ | |
471 | ||
6d0bfe22 | 472 | static inline int ping_supported(int family, int type, int code) |
c319b4d7 | 473 | { |
6d0bfe22 LC |
474 | return (family == AF_INET && type == ICMP_ECHO && code == 0) || |
475 | (family == AF_INET6 && type == ICMPV6_ECHO_REQUEST && code == 0); | |
c319b4d7 VK |
476 | } |
477 | ||
478 | /* | |
479 | * This routine is called by the ICMP module when it gets some | |
480 | * sort of error condition. | |
481 | */ | |
482 | ||
6d0bfe22 | 483 | void ping_err(struct sk_buff *skb, int offset, u32 info) |
c319b4d7 | 484 | { |
6d0bfe22 LC |
485 | int family; |
486 | struct icmphdr *icmph; | |
c319b4d7 | 487 | struct inet_sock *inet_sock; |
6d0bfe22 LC |
488 | int type; |
489 | int code; | |
c319b4d7 VK |
490 | struct net *net = dev_net(skb->dev); |
491 | struct sock *sk; | |
492 | int harderr; | |
493 | int err; | |
494 | ||
6d0bfe22 LC |
495 | if (skb->protocol == htons(ETH_P_IP)) { |
496 | family = AF_INET; | |
497 | type = icmp_hdr(skb)->type; | |
498 | code = icmp_hdr(skb)->code; | |
499 | icmph = (struct icmphdr *)(skb->data + offset); | |
500 | } else if (skb->protocol == htons(ETH_P_IPV6)) { | |
501 | family = AF_INET6; | |
502 | type = icmp6_hdr(skb)->icmp6_type; | |
503 | code = icmp6_hdr(skb)->icmp6_code; | |
504 | icmph = (struct icmphdr *) (skb->data + offset); | |
505 | } else { | |
506 | BUG(); | |
507 | } | |
508 | ||
c319b4d7 VK |
509 | /* We assume the packet has already been checked by icmp_unreach */ |
510 | ||
6d0bfe22 | 511 | if (!ping_supported(family, icmph->type, icmph->code)) |
c319b4d7 VK |
512 | return; |
513 | ||
6d0bfe22 LC |
514 | pr_debug("ping_err(proto=0x%x,type=%d,code=%d,id=%04x,seq=%04x)\n", |
515 | skb->protocol, type, code, ntohs(icmph->un.echo.id), | |
516 | ntohs(icmph->un.echo.sequence)); | |
c319b4d7 | 517 | |
6d0bfe22 | 518 | sk = ping_lookup(net, skb, ntohs(icmph->un.echo.id)); |
51456b29 | 519 | if (!sk) { |
c319b4d7 VK |
520 | pr_debug("no socket, dropping\n"); |
521 | return; /* No socket for error */ | |
522 | } | |
523 | pr_debug("err on socket %p\n", sk); | |
524 | ||
525 | err = 0; | |
526 | harderr = 0; | |
527 | inet_sock = inet_sk(sk); | |
528 | ||
6d0bfe22 LC |
529 | if (skb->protocol == htons(ETH_P_IP)) { |
530 | switch (type) { | |
531 | default: | |
532 | case ICMP_TIME_EXCEEDED: | |
533 | err = EHOSTUNREACH; | |
534 | break; | |
535 | case ICMP_SOURCE_QUENCH: | |
536 | /* This is not a real error but ping wants to see it. | |
537 | * Report it with some fake errno. | |
538 | */ | |
539 | err = EREMOTEIO; | |
540 | break; | |
541 | case ICMP_PARAMETERPROB: | |
542 | err = EPROTO; | |
543 | harderr = 1; | |
544 | break; | |
545 | case ICMP_DEST_UNREACH: | |
546 | if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */ | |
547 | ipv4_sk_update_pmtu(skb, sk, info); | |
548 | if (inet_sock->pmtudisc != IP_PMTUDISC_DONT) { | |
549 | err = EMSGSIZE; | |
550 | harderr = 1; | |
551 | break; | |
552 | } | |
553 | goto out; | |
c319b4d7 | 554 | } |
6d0bfe22 LC |
555 | err = EHOSTUNREACH; |
556 | if (code <= NR_ICMP_UNREACH) { | |
557 | harderr = icmp_err_convert[code].fatal; | |
558 | err = icmp_err_convert[code].errno; | |
559 | } | |
560 | break; | |
561 | case ICMP_REDIRECT: | |
562 | /* See ICMP_SOURCE_QUENCH */ | |
563 | ipv4_sk_redirect(skb, sk); | |
564 | err = EREMOTEIO; | |
565 | break; | |
c319b4d7 | 566 | } |
6d0bfe22 LC |
567 | #if IS_ENABLED(CONFIG_IPV6) |
568 | } else if (skb->protocol == htons(ETH_P_IPV6)) { | |
569 | harderr = pingv6_ops.icmpv6_err_convert(type, code, &err); | |
570 | #endif | |
c319b4d7 VK |
571 | } |
572 | ||
573 | /* | |
574 | * RFC1122: OK. Passes ICMP errors back to application, as per | |
575 | * 4.1.3.3. | |
576 | */ | |
6d0bfe22 LC |
577 | if ((family == AF_INET && !inet_sock->recverr) || |
578 | (family == AF_INET6 && !inet6_sk(sk)->recverr)) { | |
c319b4d7 VK |
579 | if (!harderr || sk->sk_state != TCP_ESTABLISHED) |
580 | goto out; | |
581 | } else { | |
6d0bfe22 LC |
582 | if (family == AF_INET) { |
583 | ip_icmp_error(sk, skb, err, 0 /* no remote port */, | |
584 | info, (u8 *)icmph); | |
585 | #if IS_ENABLED(CONFIG_IPV6) | |
586 | } else if (family == AF_INET6) { | |
587 | pingv6_ops.ipv6_icmp_error(sk, skb, err, 0, | |
588 | info, (u8 *)icmph); | |
589 | #endif | |
590 | } | |
c319b4d7 VK |
591 | } |
592 | sk->sk_err = err; | |
593 | sk->sk_error_report(sk); | |
594 | out: | |
595 | sock_put(sk); | |
596 | } | |
6d0bfe22 | 597 | EXPORT_SYMBOL_GPL(ping_err); |
c319b4d7 VK |
598 | |
599 | /* | |
6d0bfe22 LC |
600 | * Copy and checksum an ICMP Echo packet from user space into a buffer |
601 | * starting from the payload. | |
c319b4d7 VK |
602 | */ |
603 | ||
6d0bfe22 LC |
604 | int ping_getfrag(void *from, char *to, |
605 | int offset, int fraglen, int odd, struct sk_buff *skb) | |
c319b4d7 VK |
606 | { |
607 | struct pingfakehdr *pfh = (struct pingfakehdr *)from; | |
608 | ||
609 | if (offset == 0) { | |
21226abb AV |
610 | fraglen -= sizeof(struct icmphdr); |
611 | if (fraglen < 0) | |
c319b4d7 | 612 | BUG(); |
21226abb AV |
613 | if (csum_and_copy_from_iter(to + sizeof(struct icmphdr), |
614 | fraglen, &pfh->wcheck, | |
615 | &pfh->msg->msg_iter) != fraglen) | |
c319b4d7 | 616 | return -EFAULT; |
6d0bfe22 LC |
617 | } else if (offset < sizeof(struct icmphdr)) { |
618 | BUG(); | |
619 | } else { | |
21226abb AV |
620 | if (csum_and_copy_from_iter(to, fraglen, &pfh->wcheck, |
621 | &pfh->msg->msg_iter) != fraglen) | |
6d0bfe22 LC |
622 | return -EFAULT; |
623 | } | |
c319b4d7 | 624 | |
6d0bfe22 LC |
625 | #if IS_ENABLED(CONFIG_IPV6) |
626 | /* For IPv6, checksum each skb as we go along, as expected by | |
627 | * icmpv6_push_pending_frames. For IPv4, accumulate the checksum in | |
628 | * wcheck, it will be finalized in ping_v4_push_pending_frames. | |
629 | */ | |
630 | if (pfh->family == AF_INET6) { | |
631 | skb->csum = pfh->wcheck; | |
632 | skb->ip_summed = CHECKSUM_NONE; | |
633 | pfh->wcheck = 0; | |
c319b4d7 | 634 | } |
6d0bfe22 LC |
635 | #endif |
636 | ||
c319b4d7 VK |
637 | return 0; |
638 | } | |
6d0bfe22 | 639 | EXPORT_SYMBOL_GPL(ping_getfrag); |
c319b4d7 | 640 | |
6d0bfe22 LC |
641 | static int ping_v4_push_pending_frames(struct sock *sk, struct pingfakehdr *pfh, |
642 | struct flowi4 *fl4) | |
c319b4d7 VK |
643 | { |
644 | struct sk_buff *skb = skb_peek(&sk->sk_write_queue); | |
645 | ||
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 | ||
661 | /* | |
662 | * Check the flags. | |
663 | */ | |
664 | ||
665 | /* Mirror BSD error message compatibility */ | |
666 | if (msg->msg_flags & MSG_OOB) | |
667 | return -EOPNOTSUPP; | |
668 | ||
669 | /* | |
670 | * Fetch the ICMP header provided by the userland. | |
6d0bfe22 | 671 | * iovec is modified! The ICMP header is consumed. |
c319b4d7 | 672 | */ |
6ce8e9ce | 673 | if (memcpy_from_msg(user_icmph, msg, icmph_len)) |
c319b4d7 | 674 | return -EFAULT; |
6d0bfe22 LC |
675 | |
676 | if (family == AF_INET) { | |
677 | type = ((struct icmphdr *) user_icmph)->type; | |
678 | code = ((struct icmphdr *) user_icmph)->code; | |
679 | #if IS_ENABLED(CONFIG_IPV6) | |
680 | } else if (family == AF_INET6) { | |
681 | type = ((struct icmp6hdr *) user_icmph)->icmp6_type; | |
682 | code = ((struct icmp6hdr *) user_icmph)->icmp6_code; | |
683 | #endif | |
684 | } else { | |
685 | BUG(); | |
686 | } | |
687 | ||
688 | if (!ping_supported(family, type, code)) | |
c319b4d7 VK |
689 | return -EINVAL; |
690 | ||
6d0bfe22 LC |
691 | return 0; |
692 | } | |
693 | EXPORT_SYMBOL_GPL(ping_common_sendmsg); | |
694 | ||
1b784140 | 695 | static int ping_v4_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) |
6d0bfe22 LC |
696 | { |
697 | struct net *net = sock_net(sk); | |
698 | struct flowi4 fl4; | |
699 | struct inet_sock *inet = inet_sk(sk); | |
700 | struct ipcm_cookie ipc; | |
701 | struct icmphdr user_icmph; | |
702 | struct pingfakehdr pfh; | |
703 | struct rtable *rt = NULL; | |
704 | struct ip_options_data opt_copy; | |
705 | int free = 0; | |
706 | __be32 saddr, daddr, faddr; | |
707 | u8 tos; | |
708 | int err; | |
709 | ||
710 | pr_debug("ping_v4_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num); | |
711 | ||
712 | err = ping_common_sendmsg(AF_INET, msg, len, &user_icmph, | |
713 | sizeof(user_icmph)); | |
714 | if (err) | |
715 | return err; | |
716 | ||
c319b4d7 VK |
717 | /* |
718 | * Get and verify the address. | |
719 | */ | |
720 | ||
721 | if (msg->msg_name) { | |
342dfc30 | 722 | DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name); |
c319b4d7 VK |
723 | if (msg->msg_namelen < sizeof(*usin)) |
724 | return -EINVAL; | |
725 | if (usin->sin_family != AF_INET) | |
9145736d | 726 | return -EAFNOSUPPORT; |
c319b4d7 VK |
727 | daddr = usin->sin_addr.s_addr; |
728 | /* no remote port */ | |
729 | } else { | |
730 | if (sk->sk_state != TCP_ESTABLISHED) | |
731 | return -EDESTADDRREQ; | |
732 | daddr = inet->inet_daddr; | |
733 | /* no remote port */ | |
734 | } | |
735 | ||
736 | ipc.addr = inet->inet_saddr; | |
737 | ipc.opt = NULL; | |
738 | ipc.oif = sk->sk_bound_dev_if; | |
739 | ipc.tx_flags = 0; | |
aa661581 FF |
740 | ipc.ttl = 0; |
741 | ipc.tos = -1; | |
bf84a010 DB |
742 | |
743 | sock_tx_timestamp(sk, &ipc.tx_flags); | |
c319b4d7 VK |
744 | |
745 | if (msg->msg_controllen) { | |
c8e6ad08 | 746 | err = ip_cmsg_send(sock_net(sk), msg, &ipc, false); |
c319b4d7 VK |
747 | if (err) |
748 | return err; | |
749 | if (ipc.opt) | |
750 | free = 1; | |
751 | } | |
752 | if (!ipc.opt) { | |
753 | struct ip_options_rcu *inet_opt; | |
754 | ||
755 | rcu_read_lock(); | |
756 | inet_opt = rcu_dereference(inet->inet_opt); | |
757 | if (inet_opt) { | |
758 | memcpy(&opt_copy, inet_opt, | |
759 | sizeof(*inet_opt) + inet_opt->opt.optlen); | |
760 | ipc.opt = &opt_copy.opt; | |
761 | } | |
762 | rcu_read_unlock(); | |
763 | } | |
764 | ||
765 | saddr = ipc.addr; | |
766 | ipc.addr = faddr = daddr; | |
767 | ||
768 | if (ipc.opt && ipc.opt->opt.srr) { | |
769 | if (!daddr) | |
770 | return -EINVAL; | |
771 | faddr = ipc.opt->opt.faddr; | |
772 | } | |
aa661581 | 773 | tos = get_rttos(&ipc, inet); |
c319b4d7 VK |
774 | if (sock_flag(sk, SOCK_LOCALROUTE) || |
775 | (msg->msg_flags & MSG_DONTROUTE) || | |
776 | (ipc.opt && ipc.opt->opt.is_strictroute)) { | |
777 | tos |= RTO_ONLINK; | |
778 | } | |
779 | ||
780 | if (ipv4_is_multicast(daddr)) { | |
781 | if (!ipc.oif) | |
782 | ipc.oif = inet->mc_index; | |
783 | if (!saddr) | |
784 | saddr = inet->mc_addr; | |
76e21053 EH |
785 | } else if (!ipc.oif) |
786 | ipc.oif = inet->uc_index; | |
c319b4d7 VK |
787 | |
788 | flowi4_init_output(&fl4, ipc.oif, sk->sk_mark, tos, | |
789 | RT_SCOPE_UNIVERSE, sk->sk_protocol, | |
790 | inet_sk_flowi_flags(sk), faddr, saddr, 0, 0); | |
791 | ||
792 | security_sk_classify_flow(sk, flowi4_to_flowi(&fl4)); | |
793 | rt = ip_route_output_flow(net, &fl4, sk); | |
794 | if (IS_ERR(rt)) { | |
795 | err = PTR_ERR(rt); | |
796 | rt = NULL; | |
797 | if (err == -ENETUNREACH) | |
f1d8cba6 | 798 | IP_INC_STATS(net, IPSTATS_MIB_OUTNOROUTES); |
c319b4d7 VK |
799 | goto out; |
800 | } | |
801 | ||
802 | err = -EACCES; | |
803 | if ((rt->rt_flags & RTCF_BROADCAST) && | |
804 | !sock_flag(sk, SOCK_BROADCAST)) | |
805 | goto out; | |
806 | ||
807 | if (msg->msg_flags & MSG_CONFIRM) | |
808 | goto do_confirm; | |
809 | back_from_confirm: | |
810 | ||
811 | if (!ipc.addr) | |
812 | ipc.addr = fl4.daddr; | |
813 | ||
814 | lock_sock(sk); | |
815 | ||
816 | pfh.icmph.type = user_icmph.type; /* already checked */ | |
817 | pfh.icmph.code = user_icmph.code; /* ditto */ | |
818 | pfh.icmph.checksum = 0; | |
819 | pfh.icmph.un.echo.id = inet->inet_sport; | |
820 | pfh.icmph.un.echo.sequence = user_icmph.un.echo.sequence; | |
cacdc7d2 | 821 | pfh.msg = msg; |
c319b4d7 | 822 | pfh.wcheck = 0; |
6d0bfe22 | 823 | pfh.family = AF_INET; |
c319b4d7 VK |
824 | |
825 | err = ip_append_data(sk, &fl4, ping_getfrag, &pfh, len, | |
826 | 0, &ipc, &rt, msg->msg_flags); | |
827 | if (err) | |
828 | ip_flush_pending_frames(sk); | |
829 | else | |
6d0bfe22 | 830 | err = ping_v4_push_pending_frames(sk, &pfh, &fl4); |
c319b4d7 VK |
831 | release_sock(sk); |
832 | ||
833 | out: | |
834 | ip_rt_put(rt); | |
835 | if (free) | |
836 | kfree(ipc.opt); | |
837 | if (!err) { | |
838 | icmp_out_count(sock_net(sk), user_icmph.type); | |
839 | return len; | |
840 | } | |
841 | return err; | |
842 | ||
843 | do_confirm: | |
844 | dst_confirm(&rt->dst); | |
845 | if (!(msg->msg_flags & MSG_PROBE) || len) | |
846 | goto back_from_confirm; | |
847 | err = 0; | |
848 | goto out; | |
849 | } | |
850 | ||
1b784140 YX |
851 | int ping_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int noblock, |
852 | int flags, int *addr_len) | |
c319b4d7 VK |
853 | { |
854 | struct inet_sock *isk = inet_sk(sk); | |
6d0bfe22 | 855 | int family = sk->sk_family; |
c319b4d7 VK |
856 | struct sk_buff *skb; |
857 | int copied, err; | |
858 | ||
859 | pr_debug("ping_recvmsg(sk=%p,sk->num=%u)\n", isk, isk->inet_num); | |
860 | ||
a5e7424d | 861 | err = -EOPNOTSUPP; |
c319b4d7 VK |
862 | if (flags & MSG_OOB) |
863 | goto out; | |
864 | ||
f4713a3d WB |
865 | if (flags & MSG_ERRQUEUE) |
866 | return inet_recv_error(sk, msg, len, addr_len); | |
c319b4d7 VK |
867 | |
868 | skb = skb_recv_datagram(sk, flags, noblock, &err); | |
869 | if (!skb) | |
870 | goto out; | |
871 | ||
872 | copied = skb->len; | |
873 | if (copied > len) { | |
874 | msg->msg_flags |= MSG_TRUNC; | |
875 | copied = len; | |
876 | } | |
877 | ||
878 | /* Don't bother checking the checksum */ | |
51f3d02b | 879 | err = skb_copy_datagram_msg(skb, 0, msg, copied); |
c319b4d7 VK |
880 | if (err) |
881 | goto done; | |
882 | ||
883 | sock_recv_timestamp(msg, sk, skb); | |
884 | ||
6d0bfe22 LC |
885 | /* Copy the address and add cmsg data. */ |
886 | if (family == AF_INET) { | |
342dfc30 | 887 | DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); |
bceaa902 | 888 | |
cf970c00 HFS |
889 | if (sin) { |
890 | sin->sin_family = AF_INET; | |
891 | sin->sin_port = 0 /* skb->h.uh->source */; | |
892 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; | |
893 | memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
894 | *addr_len = sizeof(*sin); | |
895 | } | |
6d0bfe22 LC |
896 | |
897 | if (isk->cmsg_flags) | |
898 | ip_cmsg_recv(msg, skb); | |
899 | ||
900 | #if IS_ENABLED(CONFIG_IPV6) | |
901 | } else if (family == AF_INET6) { | |
902 | struct ipv6_pinfo *np = inet6_sk(sk); | |
903 | struct ipv6hdr *ip6 = ipv6_hdr(skb); | |
342dfc30 | 904 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); |
bceaa902 | 905 | |
cf970c00 HFS |
906 | if (sin6) { |
907 | sin6->sin6_family = AF_INET6; | |
908 | sin6->sin6_port = 0; | |
909 | sin6->sin6_addr = ip6->saddr; | |
910 | sin6->sin6_flowinfo = 0; | |
911 | if (np->sndflow) | |
912 | sin6->sin6_flowinfo = ip6_flowinfo(ip6); | |
913 | sin6->sin6_scope_id = | |
914 | ipv6_iface_scope_id(&sin6->sin6_addr, | |
4330487a | 915 | inet6_iif(skb)); |
cf970c00 HFS |
916 | *addr_len = sizeof(*sin6); |
917 | } | |
6d0bfe22 LC |
918 | |
919 | if (inet6_sk(sk)->rxopt.all) | |
4b261c75 HFS |
920 | pingv6_ops.ip6_datagram_recv_common_ctl(sk, msg, skb); |
921 | if (skb->protocol == htons(ETH_P_IPV6) && | |
922 | inet6_sk(sk)->rxopt.all) | |
923 | pingv6_ops.ip6_datagram_recv_specific_ctl(sk, msg, skb); | |
924 | else if (skb->protocol == htons(ETH_P_IP) && isk->cmsg_flags) | |
925 | ip_cmsg_recv(msg, skb); | |
6d0bfe22 LC |
926 | #endif |
927 | } else { | |
928 | BUG(); | |
c319b4d7 | 929 | } |
6d0bfe22 | 930 | |
c319b4d7 VK |
931 | err = copied; |
932 | ||
933 | done: | |
934 | skb_free_datagram(sk, skb); | |
935 | out: | |
936 | pr_debug("ping_recvmsg -> %d\n", err); | |
937 | return err; | |
938 | } | |
6d0bfe22 | 939 | EXPORT_SYMBOL_GPL(ping_recvmsg); |
c319b4d7 | 940 | |
6d0bfe22 | 941 | int ping_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
c319b4d7 VK |
942 | { |
943 | pr_debug("ping_queue_rcv_skb(sk=%p,sk->num=%d,skb=%p)\n", | |
058bd4d2 | 944 | inet_sk(sk), inet_sk(sk)->inet_num, skb); |
c319b4d7 | 945 | if (sock_queue_rcv_skb(sk, skb) < 0) { |
c319b4d7 VK |
946 | kfree_skb(skb); |
947 | pr_debug("ping_queue_rcv_skb -> failed\n"); | |
948 | return -1; | |
949 | } | |
950 | return 0; | |
951 | } | |
6d0bfe22 | 952 | EXPORT_SYMBOL_GPL(ping_queue_rcv_skb); |
c319b4d7 VK |
953 | |
954 | ||
955 | /* | |
956 | * All we need to do is get the socket. | |
957 | */ | |
958 | ||
e3e32170 | 959 | bool ping_rcv(struct sk_buff *skb) |
c319b4d7 VK |
960 | { |
961 | struct sock *sk; | |
962 | struct net *net = dev_net(skb->dev); | |
c319b4d7 | 963 | struct icmphdr *icmph = icmp_hdr(skb); |
c319b4d7 VK |
964 | |
965 | /* We assume the packet has already been checked by icmp_rcv */ | |
966 | ||
967 | pr_debug("ping_rcv(skb=%p,id=%04x,seq=%04x)\n", | |
058bd4d2 | 968 | skb, ntohs(icmph->un.echo.id), ntohs(icmph->un.echo.sequence)); |
c319b4d7 VK |
969 | |
970 | /* Push ICMP header back */ | |
971 | skb_push(skb, skb->data - (u8 *)icmph); | |
972 | ||
6d0bfe22 | 973 | sk = ping_lookup(net, skb, ntohs(icmph->un.echo.id)); |
c319b4d7 | 974 | if (sk != NULL) { |
fc752f1f | 975 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); |
976 | ||
c319b4d7 | 977 | pr_debug("rcv on socket %p\n", sk); |
fc752f1f | 978 | if (skb2) |
979 | ping_queue_rcv_skb(sk, skb2); | |
c319b4d7 | 980 | sock_put(sk); |
e3e32170 | 981 | return true; |
c319b4d7 VK |
982 | } |
983 | pr_debug("no socket, dropping\n"); | |
984 | ||
e3e32170 | 985 | return false; |
c319b4d7 | 986 | } |
6d0bfe22 | 987 | EXPORT_SYMBOL_GPL(ping_rcv); |
c319b4d7 VK |
988 | |
989 | struct proto ping_prot = { | |
990 | .name = "PING", | |
991 | .owner = THIS_MODULE, | |
992 | .init = ping_init_sock, | |
993 | .close = ping_close, | |
994 | .connect = ip4_datagram_connect, | |
995 | .disconnect = udp_disconnect, | |
c319b4d7 VK |
996 | .setsockopt = ip_setsockopt, |
997 | .getsockopt = ip_getsockopt, | |
6d0bfe22 | 998 | .sendmsg = ping_v4_sendmsg, |
c319b4d7 VK |
999 | .recvmsg = ping_recvmsg, |
1000 | .bind = ping_bind, | |
1001 | .backlog_rcv = ping_queue_rcv_skb, | |
8141ed9f | 1002 | .release_cb = ip4_datagram_release_cb, |
6d0bfe22 LC |
1003 | .hash = ping_hash, |
1004 | .unhash = ping_unhash, | |
1005 | .get_port = ping_get_port, | |
c319b4d7 VK |
1006 | .obj_size = sizeof(struct inet_sock), |
1007 | }; | |
1008 | EXPORT_SYMBOL(ping_prot); | |
1009 | ||
1010 | #ifdef CONFIG_PROC_FS | |
1011 | ||
1012 | static struct sock *ping_get_first(struct seq_file *seq, int start) | |
1013 | { | |
1014 | struct sock *sk; | |
1015 | struct ping_iter_state *state = seq->private; | |
1016 | struct net *net = seq_file_net(seq); | |
1017 | ||
1018 | for (state->bucket = start; state->bucket < PING_HTABLE_SIZE; | |
1019 | ++state->bucket) { | |
1020 | struct hlist_nulls_node *node; | |
75e308c8 CG |
1021 | struct hlist_nulls_head *hslot; |
1022 | ||
1023 | hslot = &ping_table.hash[state->bucket]; | |
c319b4d7 VK |
1024 | |
1025 | if (hlist_nulls_empty(hslot)) | |
1026 | continue; | |
1027 | ||
1028 | sk_nulls_for_each(sk, node, hslot) { | |
8cc785f6 LC |
1029 | if (net_eq(sock_net(sk), net) && |
1030 | sk->sk_family == state->family) | |
c319b4d7 VK |
1031 | goto found; |
1032 | } | |
1033 | } | |
1034 | sk = NULL; | |
1035 | found: | |
1036 | return sk; | |
1037 | } | |
1038 | ||
1039 | static struct sock *ping_get_next(struct seq_file *seq, struct sock *sk) | |
1040 | { | |
1041 | struct ping_iter_state *state = seq->private; | |
1042 | struct net *net = seq_file_net(seq); | |
1043 | ||
1044 | do { | |
1045 | sk = sk_nulls_next(sk); | |
1046 | } while (sk && (!net_eq(sock_net(sk), net))); | |
1047 | ||
1048 | if (!sk) | |
1049 | return ping_get_first(seq, state->bucket + 1); | |
1050 | return sk; | |
1051 | } | |
1052 | ||
1053 | static struct sock *ping_get_idx(struct seq_file *seq, loff_t pos) | |
1054 | { | |
1055 | struct sock *sk = ping_get_first(seq, 0); | |
1056 | ||
1057 | if (sk) | |
1058 | while (pos && (sk = ping_get_next(seq, sk)) != NULL) | |
1059 | --pos; | |
1060 | return pos ? NULL : sk; | |
1061 | } | |
1062 | ||
d862e546 | 1063 | void *ping_seq_start(struct seq_file *seq, loff_t *pos, sa_family_t family) |
c319b4d7 VK |
1064 | { |
1065 | struct ping_iter_state *state = seq->private; | |
1066 | state->bucket = 0; | |
8cc785f6 | 1067 | state->family = family; |
c319b4d7 VK |
1068 | |
1069 | read_lock_bh(&ping_table.lock); | |
1070 | ||
1071 | return *pos ? ping_get_idx(seq, *pos-1) : SEQ_START_TOKEN; | |
1072 | } | |
d862e546 | 1073 | EXPORT_SYMBOL_GPL(ping_seq_start); |
c319b4d7 | 1074 | |
8cc785f6 LC |
1075 | static void *ping_v4_seq_start(struct seq_file *seq, loff_t *pos) |
1076 | { | |
1077 | return ping_seq_start(seq, pos, AF_INET); | |
1078 | } | |
1079 | ||
d862e546 | 1080 | void *ping_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
c319b4d7 VK |
1081 | { |
1082 | struct sock *sk; | |
1083 | ||
1084 | if (v == SEQ_START_TOKEN) | |
1085 | sk = ping_get_idx(seq, 0); | |
1086 | else | |
1087 | sk = ping_get_next(seq, v); | |
1088 | ||
1089 | ++*pos; | |
1090 | return sk; | |
1091 | } | |
d862e546 | 1092 | EXPORT_SYMBOL_GPL(ping_seq_next); |
c319b4d7 | 1093 | |
d862e546 | 1094 | void ping_seq_stop(struct seq_file *seq, void *v) |
c319b4d7 VK |
1095 | { |
1096 | read_unlock_bh(&ping_table.lock); | |
1097 | } | |
d862e546 | 1098 | EXPORT_SYMBOL_GPL(ping_seq_stop); |
c319b4d7 | 1099 | |
8cc785f6 | 1100 | static void ping_v4_format_sock(struct sock *sp, struct seq_file *f, |
652586df | 1101 | int bucket) |
c319b4d7 VK |
1102 | { |
1103 | struct inet_sock *inet = inet_sk(sp); | |
1104 | __be32 dest = inet->inet_daddr; | |
1105 | __be32 src = inet->inet_rcv_saddr; | |
1106 | __u16 destp = ntohs(inet->inet_dport); | |
1107 | __u16 srcp = ntohs(inet->inet_sport); | |
1108 | ||
1109 | seq_printf(f, "%5d: %08X:%04X %08X:%04X" | |
652586df | 1110 | " %02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d", |
c319b4d7 VK |
1111 | bucket, src, srcp, dest, destp, sp->sk_state, |
1112 | sk_wmem_alloc_get(sp), | |
1113 | sk_rmem_alloc_get(sp), | |
a7cb5a49 EB |
1114 | 0, 0L, 0, |
1115 | from_kuid_munged(seq_user_ns(f), sock_i_uid(sp)), | |
1116 | 0, sock_i_ino(sp), | |
c319b4d7 | 1117 | atomic_read(&sp->sk_refcnt), sp, |
652586df | 1118 | atomic_read(&sp->sk_drops)); |
c319b4d7 VK |
1119 | } |
1120 | ||
8cc785f6 | 1121 | static int ping_v4_seq_show(struct seq_file *seq, void *v) |
c319b4d7 | 1122 | { |
652586df | 1123 | seq_setwidth(seq, 127); |
c319b4d7 | 1124 | if (v == SEQ_START_TOKEN) |
652586df | 1125 | seq_puts(seq, " sl local_address rem_address st tx_queue " |
c319b4d7 VK |
1126 | "rx_queue tr tm->when retrnsmt uid timeout " |
1127 | "inode ref pointer drops"); | |
1128 | else { | |
1129 | struct ping_iter_state *state = seq->private; | |
c319b4d7 | 1130 | |
652586df | 1131 | ping_v4_format_sock(v, seq, state->bucket); |
c319b4d7 | 1132 | } |
652586df | 1133 | seq_pad(seq, '\n'); |
c319b4d7 VK |
1134 | return 0; |
1135 | } | |
1136 | ||
8cc785f6 LC |
1137 | static const struct seq_operations ping_v4_seq_ops = { |
1138 | .show = ping_v4_seq_show, | |
1139 | .start = ping_v4_seq_start, | |
c319b4d7 VK |
1140 | .next = ping_seq_next, |
1141 | .stop = ping_seq_stop, | |
1142 | }; | |
1143 | ||
1144 | static int ping_seq_open(struct inode *inode, struct file *file) | |
1145 | { | |
8cc785f6 LC |
1146 | struct ping_seq_afinfo *afinfo = PDE_DATA(inode); |
1147 | return seq_open_net(inode, file, &afinfo->seq_ops, | |
c319b4d7 VK |
1148 | sizeof(struct ping_iter_state)); |
1149 | } | |
1150 | ||
d862e546 | 1151 | const struct file_operations ping_seq_fops = { |
c319b4d7 VK |
1152 | .open = ping_seq_open, |
1153 | .read = seq_read, | |
1154 | .llseek = seq_lseek, | |
1155 | .release = seq_release_net, | |
1156 | }; | |
d862e546 | 1157 | EXPORT_SYMBOL_GPL(ping_seq_fops); |
c319b4d7 | 1158 | |
8cc785f6 LC |
1159 | static struct ping_seq_afinfo ping_v4_seq_afinfo = { |
1160 | .name = "icmp", | |
1161 | .family = AF_INET, | |
1162 | .seq_fops = &ping_seq_fops, | |
1163 | .seq_ops = { | |
1164 | .start = ping_v4_seq_start, | |
1165 | .show = ping_v4_seq_show, | |
1166 | .next = ping_seq_next, | |
1167 | .stop = ping_seq_stop, | |
1168 | }, | |
1169 | }; | |
1170 | ||
d862e546 | 1171 | int ping_proc_register(struct net *net, struct ping_seq_afinfo *afinfo) |
c319b4d7 VK |
1172 | { |
1173 | struct proc_dir_entry *p; | |
8cc785f6 LC |
1174 | p = proc_create_data(afinfo->name, S_IRUGO, net->proc_net, |
1175 | afinfo->seq_fops, afinfo); | |
c319b4d7 | 1176 | if (!p) |
8cc785f6 LC |
1177 | return -ENOMEM; |
1178 | return 0; | |
c319b4d7 | 1179 | } |
d862e546 | 1180 | EXPORT_SYMBOL_GPL(ping_proc_register); |
c319b4d7 | 1181 | |
d862e546 | 1182 | void ping_proc_unregister(struct net *net, struct ping_seq_afinfo *afinfo) |
c319b4d7 | 1183 | { |
8cc785f6 | 1184 | remove_proc_entry(afinfo->name, net->proc_net); |
c319b4d7 | 1185 | } |
d862e546 | 1186 | EXPORT_SYMBOL_GPL(ping_proc_unregister); |
c319b4d7 | 1187 | |
8cc785f6 | 1188 | static int __net_init ping_v4_proc_init_net(struct net *net) |
c319b4d7 | 1189 | { |
8cc785f6 | 1190 | return ping_proc_register(net, &ping_v4_seq_afinfo); |
c319b4d7 VK |
1191 | } |
1192 | ||
8cc785f6 | 1193 | static void __net_exit ping_v4_proc_exit_net(struct net *net) |
c319b4d7 | 1194 | { |
8cc785f6 | 1195 | ping_proc_unregister(net, &ping_v4_seq_afinfo); |
c319b4d7 VK |
1196 | } |
1197 | ||
8cc785f6 LC |
1198 | static struct pernet_operations ping_v4_net_ops = { |
1199 | .init = ping_v4_proc_init_net, | |
1200 | .exit = ping_v4_proc_exit_net, | |
c319b4d7 VK |
1201 | }; |
1202 | ||
1203 | int __init ping_proc_init(void) | |
1204 | { | |
8cc785f6 | 1205 | return register_pernet_subsys(&ping_v4_net_ops); |
c319b4d7 VK |
1206 | } |
1207 | ||
1208 | void ping_proc_exit(void) | |
1209 | { | |
8cc785f6 | 1210 | unregister_pernet_subsys(&ping_v4_net_ops); |
c319b4d7 VK |
1211 | } |
1212 | ||
1213 | #endif | |
1214 | ||
1215 | void __init ping_init(void) | |
1216 | { | |
1217 | int i; | |
1218 | ||
1219 | for (i = 0; i < PING_HTABLE_SIZE; i++) | |
1220 | INIT_HLIST_NULLS_HEAD(&ping_table.hash[i], i); | |
1221 | rwlock_init(&ping_table.lock); | |
1222 | } |