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 | ||
6fa3eb70 S |
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 | |
c319b4d7 | 55 | |
6fa3eb70 S |
56 | |
57 | struct ping_table ping_table; | |
58 | struct pingv6_ops pingv6_ops; | |
59 | EXPORT_SYMBOL_GPL(pingv6_ops); | |
c319b4d7 | 60 | |
1b1cb1f7 | 61 | static u16 ping_port_rover; |
c319b4d7 | 62 | |
95c96174 | 63 | static inline int ping_hashfn(struct net *net, unsigned int num, unsigned int mask) |
c319b4d7 VK |
64 | { |
65 | int res = (num + net_hash_mix(net)) & mask; | |
95c96174 | 66 | |
c319b4d7 VK |
67 | pr_debug("hash(%d) = %d\n", num, res); |
68 | return res; | |
69 | } | |
6fa3eb70 | 70 | EXPORT_SYMBOL_GPL(ping_hash); |
c319b4d7 VK |
71 | |
72 | static inline struct hlist_nulls_head *ping_hashslot(struct ping_table *table, | |
95c96174 | 73 | struct net *net, unsigned int num) |
c319b4d7 VK |
74 | { |
75 | return &table->hash[ping_hashfn(net, num, PING_HTABLE_MASK)]; | |
76 | } | |
77 | ||
6fa3eb70 | 78 | int ping_get_port(struct sock *sk, unsigned short ident) |
c319b4d7 VK |
79 | { |
80 | struct hlist_nulls_node *node; | |
81 | struct hlist_nulls_head *hlist; | |
82 | struct inet_sock *isk, *isk2; | |
83 | struct sock *sk2 = NULL; | |
84 | ||
85 | isk = inet_sk(sk); | |
86 | write_lock_bh(&ping_table.lock); | |
87 | if (ident == 0) { | |
88 | u32 i; | |
89 | u16 result = ping_port_rover + 1; | |
90 | ||
91 | for (i = 0; i < (1L << 16); i++, result++) { | |
92 | if (!result) | |
93 | result++; /* avoid zero */ | |
94 | hlist = ping_hashslot(&ping_table, sock_net(sk), | |
95 | result); | |
96 | ping_portaddr_for_each_entry(sk2, node, hlist) { | |
97 | isk2 = inet_sk(sk2); | |
98 | ||
99 | if (isk2->inet_num == result) | |
100 | goto next_port; | |
101 | } | |
102 | ||
103 | /* found */ | |
104 | ping_port_rover = ident = result; | |
105 | break; | |
106 | next_port: | |
107 | ; | |
108 | } | |
109 | if (i >= (1L << 16)) | |
110 | goto fail; | |
111 | } else { | |
112 | hlist = ping_hashslot(&ping_table, sock_net(sk), ident); | |
113 | ping_portaddr_for_each_entry(sk2, node, hlist) { | |
114 | isk2 = inet_sk(sk2); | |
115 | ||
6fa3eb70 S |
116 | /* BUG? Why is this reuse and not reuseaddr? ping.c |
117 | * doesn't turn off SO_REUSEADDR, and it doesn't expect | |
118 | * that other ping processes can steal its packets. | |
119 | */ | |
c319b4d7 VK |
120 | if ((isk2->inet_num == ident) && |
121 | (sk2 != sk) && | |
122 | (!sk2->sk_reuse || !sk->sk_reuse)) | |
123 | goto fail; | |
124 | } | |
125 | } | |
126 | ||
127 | pr_debug("found port/ident = %d\n", ident); | |
128 | isk->inet_num = ident; | |
129 | if (sk_unhashed(sk)) { | |
130 | pr_debug("was not hashed\n"); | |
131 | sock_hold(sk); | |
132 | hlist_nulls_add_head(&sk->sk_nulls_node, hlist); | |
133 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); | |
134 | } | |
135 | write_unlock_bh(&ping_table.lock); | |
136 | return 0; | |
137 | ||
138 | fail: | |
139 | write_unlock_bh(&ping_table.lock); | |
140 | return 1; | |
141 | } | |
6fa3eb70 | 142 | EXPORT_SYMBOL_GPL(ping_get_port); |
c319b4d7 | 143 | |
6fa3eb70 | 144 | void ping_hash(struct sock *sk) |
c319b4d7 | 145 | { |
6fa3eb70 | 146 | pr_debug("ping_hash(sk->port=%u)\n", inet_sk(sk)->inet_num); |
c319b4d7 VK |
147 | BUG(); /* "Please do not press this button again." */ |
148 | } | |
149 | ||
6fa3eb70 | 150 | void ping_unhash(struct sock *sk) |
c319b4d7 VK |
151 | { |
152 | struct inet_sock *isk = inet_sk(sk); | |
6fa3eb70 | 153 | pr_info("ping_unhash(isk=%p,isk->num=%u)\n", isk, isk->inet_num); |
c319b4d7 | 154 | if (sk_hashed(sk)) { |
c319b4d7 VK |
155 | write_lock_bh(&ping_table.lock); |
156 | hlist_nulls_del(&sk->sk_nulls_node); | |
4b9e9796 | 157 | sk_nulls_node_init(&sk->sk_nulls_node); |
c319b4d7 | 158 | sock_put(sk); |
747465ef ED |
159 | isk->inet_num = 0; |
160 | isk->inet_sport = 0; | |
c319b4d7 VK |
161 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); |
162 | write_unlock_bh(&ping_table.lock); | |
6fa3eb70 | 163 | pr_info("ping_unhash(isk=%p,sk=%p)\n", isk, sk); |
c319b4d7 VK |
164 | } |
165 | } | |
6fa3eb70 | 166 | EXPORT_SYMBOL_GPL(ping_unhash); |
c319b4d7 | 167 | |
6fa3eb70 | 168 | static struct sock *ping_lookup(struct net *net, struct sk_buff *skb, u16 ident) |
c319b4d7 VK |
169 | { |
170 | struct hlist_nulls_head *hslot = ping_hashslot(&ping_table, net, ident); | |
171 | struct sock *sk = NULL; | |
172 | struct inet_sock *isk; | |
173 | struct hlist_nulls_node *hnode; | |
6fa3eb70 S |
174 | int dif = skb->dev->ifindex; |
175 | ||
176 | if (skb->protocol == htons(ETH_P_IP)) { | |
177 | pr_debug("try to find: num = %d, daddr = %pI4, dif = %d\n", | |
178 | (int)ident, &ip_hdr(skb)->daddr, dif); | |
179 | #if IS_ENABLED(CONFIG_IPV6) | |
180 | } else if (skb->protocol == htons(ETH_P_IPV6)) { | |
181 | pr_debug("try to find: num = %d, daddr = %pI6c, dif = %d\n", | |
182 | (int)ident, &ipv6_hdr(skb)->daddr, dif); | |
183 | #endif | |
184 | } | |
c319b4d7 | 185 | |
c319b4d7 VK |
186 | read_lock_bh(&ping_table.lock); |
187 | ||
188 | ping_portaddr_for_each_entry(sk, hnode, hslot) { | |
189 | isk = inet_sk(sk); | |
190 | ||
c319b4d7 VK |
191 | pr_debug("iterate\n"); |
192 | if (isk->inet_num != ident) | |
193 | continue; | |
6fa3eb70 S |
194 | |
195 | if (skb->protocol == htons(ETH_P_IP) && | |
196 | sk->sk_family == AF_INET) { | |
197 | pr_debug("found: %p: num=%d, daddr=%pI4, dif=%d\n", sk, | |
198 | (int) isk->inet_num, &isk->inet_rcv_saddr, | |
199 | sk->sk_bound_dev_if); | |
200 | ||
201 | if (isk->inet_rcv_saddr && | |
202 | isk->inet_rcv_saddr != ip_hdr(skb)->daddr) | |
203 | continue; | |
204 | #if IS_ENABLED(CONFIG_IPV6) | |
205 | } else if (skb->protocol == htons(ETH_P_IPV6) && | |
206 | sk->sk_family == AF_INET6) { | |
207 | struct ipv6_pinfo *np = inet6_sk(sk); | |
208 | ||
209 | pr_debug("found: %p: num=%d, daddr=%pI6c, dif=%d\n", sk, | |
210 | (int) isk->inet_num, | |
211 | &inet6_sk(sk)->rcv_saddr, | |
212 | sk->sk_bound_dev_if); | |
213 | ||
214 | if (!ipv6_addr_any(&np->rcv_saddr) && | |
215 | !ipv6_addr_equal(&np->rcv_saddr, | |
216 | &ipv6_hdr(skb)->daddr)) | |
217 | continue; | |
218 | #endif | |
219 | } | |
220 | ||
c319b4d7 VK |
221 | if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) |
222 | continue; | |
223 | ||
224 | sock_hold(sk); | |
225 | goto exit; | |
226 | } | |
227 | ||
228 | sk = NULL; | |
229 | exit: | |
230 | read_unlock_bh(&ping_table.lock); | |
231 | ||
232 | return sk; | |
233 | } | |
234 | ||
7064d16e EB |
235 | static void inet_get_ping_group_range_net(struct net *net, kgid_t *low, |
236 | kgid_t *high) | |
f56e03e8 | 237 | { |
7064d16e | 238 | kgid_t *data = net->ipv4.sysctl_ping_group_range; |
95c96174 ED |
239 | unsigned int seq; |
240 | ||
f56e03e8 VK |
241 | do { |
242 | seq = read_seqbegin(&sysctl_local_ports.lock); | |
243 | ||
244 | *low = data[0]; | |
245 | *high = data[1]; | |
246 | } while (read_seqretry(&sysctl_local_ports.lock, seq)); | |
247 | } | |
248 | ||
249 | ||
6fa3eb70 | 250 | int ping_init_sock(struct sock *sk) |
c319b4d7 VK |
251 | { |
252 | struct net *net = sock_net(sk); | |
7064d16e | 253 | kgid_t group = current_egid(); |
8dbc8dc8 WX |
254 | struct group_info *group_info; |
255 | int i, j, count; | |
ae2975bc | 256 | kgid_t low, high; |
8dbc8dc8 | 257 | int ret = 0; |
6fa3eb70 | 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 | ||
8dbc8dc8 WX |
263 | group_info = get_current_groups(); |
264 | count = group_info->ngroups; | |
c319b4d7 VK |
265 | for (i = 0; i < group_info->nblocks; i++) { |
266 | int cp_count = min_t(int, NGROUPS_PER_BLOCK, count); | |
c319b4d7 | 267 | for (j = 0; j < cp_count; j++) { |
ae2975bc EB |
268 | kgid_t gid = group_info->blocks[i][j]; |
269 | if (gid_lte(low, gid) && gid_lte(gid, high)) | |
8dbc8dc8 | 270 | goto out_release_group; |
c319b4d7 VK |
271 | } |
272 | ||
273 | count -= cp_count; | |
274 | } | |
275 | ||
8dbc8dc8 WX |
276 | ret = -EACCES; |
277 | ||
278 | out_release_group: | |
279 | put_group_info(group_info); | |
280 | return ret; | |
c319b4d7 | 281 | } |
6fa3eb70 | 282 | EXPORT_SYMBOL_GPL(ping_init_sock); |
c319b4d7 | 283 | |
6fa3eb70 | 284 | void ping_close(struct sock *sk, long timeout) |
c319b4d7 VK |
285 | { |
286 | pr_debug("ping_close(sk=%p,sk->num=%u)\n", | |
058bd4d2 | 287 | inet_sk(sk), inet_sk(sk)->inet_num); |
c319b4d7 VK |
288 | pr_debug("isk->refcnt = %d\n", sk->sk_refcnt.counter); |
289 | ||
290 | sk_common_release(sk); | |
6fa3eb70 | 291 | pr_info("ping_close done\n"); |
c319b4d7 | 292 | } |
6fa3eb70 S |
293 | EXPORT_SYMBOL_GPL(ping_close); |
294 | ||
295 | /* Checks the bind address and possibly modifies sk->sk_bound_dev_if. */ | |
296 | int ping_check_bind_addr(struct sock *sk, struct inet_sock *isk, | |
297 | struct sockaddr *uaddr, int addr_len) { | |
298 | struct net *net = sock_net(sk); | |
299 | if (sk->sk_family == AF_INET) { | |
300 | struct sockaddr_in *addr = (struct sockaddr_in *) uaddr; | |
301 | int chk_addr_ret; | |
302 | ||
303 | if (addr_len < sizeof(*addr)) | |
304 | return -EINVAL; | |
305 | ||
306 | pr_debug("ping_check_bind_addr(sk=%p,addr=%pI4,port=%d)\n", | |
307 | sk, &addr->sin_addr.s_addr, ntohs(addr->sin_port)); | |
308 | ||
309 | chk_addr_ret = inet_addr_type(net, addr->sin_addr.s_addr); | |
c319b4d7 | 310 | |
6fa3eb70 S |
311 | if (addr->sin_addr.s_addr == htonl(INADDR_ANY)) |
312 | chk_addr_ret = RTN_LOCAL; | |
313 | ||
314 | if ((sysctl_ip_nonlocal_bind == 0 && | |
315 | isk->freebind == 0 && isk->transparent == 0 && | |
316 | chk_addr_ret != RTN_LOCAL) || | |
317 | chk_addr_ret == RTN_MULTICAST || | |
318 | chk_addr_ret == RTN_BROADCAST) | |
319 | return -EADDRNOTAVAIL; | |
320 | ||
321 | #if IS_ENABLED(CONFIG_IPV6) | |
322 | } else if (sk->sk_family == AF_INET6) { | |
323 | struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr; | |
324 | int addr_type, scoped, has_addr; | |
325 | struct net_device *dev = NULL; | |
326 | ||
327 | if (addr_len < sizeof(*addr)) | |
328 | return -EINVAL; | |
329 | ||
330 | pr_debug("ping_check_bind_addr(sk=%p,addr=%pI6c,port=%d)\n", | |
331 | sk, addr->sin6_addr.s6_addr, ntohs(addr->sin6_port)); | |
332 | ||
333 | addr_type = ipv6_addr_type(&addr->sin6_addr); | |
334 | scoped = __ipv6_addr_needs_scope_id(addr_type); | |
335 | if ((addr_type != IPV6_ADDR_ANY && | |
336 | !(addr_type & IPV6_ADDR_UNICAST)) || | |
337 | (scoped && !addr->sin6_scope_id)) | |
338 | return -EINVAL; | |
339 | ||
340 | rcu_read_lock(); | |
341 | if (addr->sin6_scope_id) { | |
342 | dev = dev_get_by_index_rcu(net, addr->sin6_scope_id); | |
343 | if (!dev) { | |
344 | rcu_read_unlock(); | |
345 | return -ENODEV; | |
346 | } | |
347 | } | |
348 | has_addr = pingv6_ops.ipv6_chk_addr(net, &addr->sin6_addr, dev, | |
349 | scoped); | |
350 | rcu_read_unlock(); | |
351 | ||
352 | if (!(isk->freebind || isk->transparent || has_addr || | |
353 | addr_type == IPV6_ADDR_ANY)) | |
354 | return -EADDRNOTAVAIL; | |
355 | ||
356 | if (scoped) | |
357 | sk->sk_bound_dev_if = addr->sin6_scope_id; | |
358 | #endif | |
359 | } else { | |
360 | return -EAFNOSUPPORT; | |
361 | } | |
362 | return 0; | |
363 | } | |
364 | ||
365 | void ping_set_saddr(struct sock *sk, struct sockaddr *saddr) | |
366 | { | |
367 | if (saddr->sa_family == AF_INET) { | |
368 | struct inet_sock *isk = inet_sk(sk); | |
369 | struct sockaddr_in *addr = (struct sockaddr_in *) saddr; | |
370 | isk->inet_rcv_saddr = isk->inet_saddr = addr->sin_addr.s_addr; | |
371 | #if IS_ENABLED(CONFIG_IPV6) | |
372 | } else if (saddr->sa_family == AF_INET6) { | |
373 | struct sockaddr_in6 *addr = (struct sockaddr_in6 *) saddr; | |
374 | struct ipv6_pinfo *np = inet6_sk(sk); | |
375 | np->rcv_saddr = np->saddr = addr->sin6_addr; | |
376 | #endif | |
377 | } | |
378 | } | |
379 | ||
380 | void ping_clear_saddr(struct sock *sk, int dif) | |
381 | { | |
382 | sk->sk_bound_dev_if = dif; | |
383 | if (sk->sk_family == AF_INET) { | |
384 | struct inet_sock *isk = inet_sk(sk); | |
385 | isk->inet_rcv_saddr = isk->inet_saddr = 0; | |
386 | #if IS_ENABLED(CONFIG_IPV6) | |
387 | } else if (sk->sk_family == AF_INET6) { | |
388 | struct ipv6_pinfo *np = inet6_sk(sk); | |
389 | memset(&np->rcv_saddr, 0, sizeof(np->rcv_saddr)); | |
390 | memset(&np->saddr, 0, sizeof(np->saddr)); | |
391 | #endif | |
392 | } | |
393 | } | |
c319b4d7 VK |
394 | /* |
395 | * We need our own bind because there are no privileged id's == local ports. | |
396 | * Moreover, we don't allow binding to multi- and broadcast addresses. | |
397 | */ | |
398 | ||
6fa3eb70 | 399 | int ping_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) |
c319b4d7 | 400 | { |
c319b4d7 VK |
401 | struct inet_sock *isk = inet_sk(sk); |
402 | unsigned short snum; | |
c319b4d7 | 403 | int err; |
6fa3eb70 | 404 | int dif = sk->sk_bound_dev_if; |
c319b4d7 | 405 | |
6fa3eb70 S |
406 | err = ping_check_bind_addr(sk, isk, uaddr, addr_len); |
407 | if (err) | |
408 | return err; | |
c319b4d7 VK |
409 | |
410 | lock_sock(sk); | |
411 | ||
412 | err = -EINVAL; | |
413 | if (isk->inet_num != 0) | |
414 | goto out; | |
415 | ||
416 | err = -EADDRINUSE; | |
6fa3eb70 S |
417 | ping_set_saddr(sk, uaddr); |
418 | snum = ntohs(((struct sockaddr_in *)uaddr)->sin_port); | |
419 | if (ping_get_port(sk, snum) != 0) { | |
420 | ping_clear_saddr(sk, dif); | |
c319b4d7 VK |
421 | goto out; |
422 | } | |
423 | ||
6fa3eb70 | 424 | pr_debug("after bind(): num = %d, dif = %d\n", |
058bd4d2 | 425 | (int)isk->inet_num, |
058bd4d2 | 426 | (int)sk->sk_bound_dev_if); |
c319b4d7 VK |
427 | |
428 | err = 0; | |
6fa3eb70 S |
429 | if ((sk->sk_family == AF_INET && isk->inet_rcv_saddr) || |
430 | (sk->sk_family == AF_INET6 && | |
431 | !ipv6_addr_any(&inet6_sk(sk)->rcv_saddr))) | |
c319b4d7 | 432 | sk->sk_userlocks |= SOCK_BINDADDR_LOCK; |
6fa3eb70 | 433 | |
c319b4d7 VK |
434 | if (snum) |
435 | sk->sk_userlocks |= SOCK_BINDPORT_LOCK; | |
436 | isk->inet_sport = htons(isk->inet_num); | |
437 | isk->inet_daddr = 0; | |
438 | isk->inet_dport = 0; | |
6fa3eb70 S |
439 | |
440 | #if IS_ENABLED(CONFIG_IPV6) | |
441 | if (sk->sk_family == AF_INET6) | |
442 | memset(&inet6_sk(sk)->daddr, 0, sizeof(inet6_sk(sk)->daddr)); | |
443 | #endif | |
444 | ||
c319b4d7 VK |
445 | sk_dst_reset(sk); |
446 | out: | |
447 | release_sock(sk); | |
448 | pr_debug("ping_v4_bind -> %d\n", err); | |
449 | return err; | |
450 | } | |
6fa3eb70 | 451 | EXPORT_SYMBOL_GPL(ping_bind); |
c319b4d7 VK |
452 | |
453 | /* | |
454 | * Is this a supported type of ICMP message? | |
455 | */ | |
456 | ||
6fa3eb70 | 457 | static inline int ping_supported(int family, int type, int code) |
c319b4d7 | 458 | { |
6fa3eb70 S |
459 | return (family == AF_INET && type == ICMP_ECHO && code == 0) || |
460 | (family == AF_INET6 && type == ICMPV6_ECHO_REQUEST && code == 0); | |
c319b4d7 VK |
461 | } |
462 | ||
463 | /* | |
464 | * This routine is called by the ICMP module when it gets some | |
465 | * sort of error condition. | |
466 | */ | |
467 | ||
6fa3eb70 | 468 | void ping_err(struct sk_buff *skb, int offset, u32 info) |
c319b4d7 | 469 | { |
6fa3eb70 S |
470 | int family; |
471 | struct icmphdr *icmph; | |
c319b4d7 | 472 | struct inet_sock *inet_sock; |
6fa3eb70 S |
473 | int type; |
474 | int code; | |
c319b4d7 VK |
475 | struct net *net = dev_net(skb->dev); |
476 | struct sock *sk; | |
477 | int harderr; | |
478 | int err; | |
479 | ||
6fa3eb70 S |
480 | if (skb->protocol == htons(ETH_P_IP)) { |
481 | family = AF_INET; | |
482 | type = icmp_hdr(skb)->type; | |
483 | code = icmp_hdr(skb)->code; | |
484 | icmph = (struct icmphdr *)(skb->data + offset); | |
485 | } else if (skb->protocol == htons(ETH_P_IPV6)) { | |
486 | family = AF_INET6; | |
487 | type = icmp6_hdr(skb)->icmp6_type; | |
488 | code = icmp6_hdr(skb)->icmp6_code; | |
489 | icmph = (struct icmphdr *) (skb->data + offset); | |
490 | } else { | |
491 | BUG(); | |
492 | } | |
493 | ||
c319b4d7 VK |
494 | /* We assume the packet has already been checked by icmp_unreach */ |
495 | ||
6fa3eb70 | 496 | if (!ping_supported(family, icmph->type, icmph->code)) |
c319b4d7 VK |
497 | return; |
498 | ||
6fa3eb70 S |
499 | pr_debug("ping_err(proto=0x%x,type=%d,code=%d,id=%04x,seq=%04x)\n", |
500 | skb->protocol, type, code, ntohs(icmph->un.echo.id), | |
501 | ntohs(icmph->un.echo.sequence)); | |
c319b4d7 | 502 | |
6fa3eb70 | 503 | sk = ping_lookup(net, skb, ntohs(icmph->un.echo.id)); |
c319b4d7 | 504 | if (sk == NULL) { |
c319b4d7 VK |
505 | pr_debug("no socket, dropping\n"); |
506 | return; /* No socket for error */ | |
507 | } | |
508 | pr_debug("err on socket %p\n", sk); | |
509 | ||
510 | err = 0; | |
511 | harderr = 0; | |
512 | inet_sock = inet_sk(sk); | |
513 | ||
6fa3eb70 S |
514 | if (skb->protocol == htons(ETH_P_IP)) { |
515 | switch (type) { | |
516 | default: | |
517 | case ICMP_TIME_EXCEEDED: | |
518 | err = EHOSTUNREACH; | |
519 | break; | |
520 | case ICMP_SOURCE_QUENCH: | |
521 | /* This is not a real error but ping wants to see it. | |
522 | * Report it with some fake errno. | |
523 | */ | |
524 | err = EREMOTEIO; | |
525 | break; | |
526 | case ICMP_PARAMETERPROB: | |
527 | err = EPROTO; | |
528 | harderr = 1; | |
529 | break; | |
530 | case ICMP_DEST_UNREACH: | |
531 | if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */ | |
532 | ipv4_sk_update_pmtu(skb, sk, info); | |
533 | if (inet_sock->pmtudisc != IP_PMTUDISC_DONT) { | |
534 | err = EMSGSIZE; | |
535 | harderr = 1; | |
536 | break; | |
537 | } | |
538 | goto out; | |
c319b4d7 | 539 | } |
6fa3eb70 S |
540 | err = EHOSTUNREACH; |
541 | if (code <= NR_ICMP_UNREACH) { | |
542 | harderr = icmp_err_convert[code].fatal; | |
543 | err = icmp_err_convert[code].errno; | |
544 | } | |
545 | break; | |
546 | case ICMP_REDIRECT: | |
547 | /* See ICMP_SOURCE_QUENCH */ | |
548 | ipv4_sk_redirect(skb, sk); | |
549 | err = EREMOTEIO; | |
550 | break; | |
c319b4d7 | 551 | } |
6fa3eb70 S |
552 | #if IS_ENABLED(CONFIG_IPV6) |
553 | } else if (skb->protocol == htons(ETH_P_IPV6)) { | |
554 | harderr = pingv6_ops.icmpv6_err_convert(type, code, &err); | |
555 | #endif | |
c319b4d7 VK |
556 | } |
557 | ||
558 | /* | |
559 | * RFC1122: OK. Passes ICMP errors back to application, as per | |
560 | * 4.1.3.3. | |
561 | */ | |
6fa3eb70 S |
562 | if ((family == AF_INET && !inet_sock->recverr) || |
563 | (family == AF_INET6 && !inet6_sk(sk)->recverr)) { | |
c319b4d7 VK |
564 | if (!harderr || sk->sk_state != TCP_ESTABLISHED) |
565 | goto out; | |
566 | } else { | |
6fa3eb70 S |
567 | if (family == AF_INET) { |
568 | ip_icmp_error(sk, skb, err, 0 /* no remote port */, | |
569 | info, (u8 *)icmph); | |
570 | #if IS_ENABLED(CONFIG_IPV6) | |
571 | } else if (family == AF_INET6) { | |
572 | pingv6_ops.ipv6_icmp_error(sk, skb, err, 0, | |
573 | info, (u8 *)icmph); | |
574 | #endif | |
575 | } | |
c319b4d7 VK |
576 | } |
577 | sk->sk_err = err; | |
578 | sk->sk_error_report(sk); | |
579 | out: | |
580 | sock_put(sk); | |
581 | } | |
6fa3eb70 | 582 | EXPORT_SYMBOL_GPL(ping_err); |
c319b4d7 VK |
583 | |
584 | /* | |
6fa3eb70 S |
585 | * Copy and checksum an ICMP Echo packet from user space into a buffer |
586 | * starting from the payload. | |
c319b4d7 VK |
587 | */ |
588 | ||
6fa3eb70 S |
589 | int ping_getfrag(void *from, char *to, |
590 | int offset, int fraglen, int odd, struct sk_buff *skb) | |
c319b4d7 VK |
591 | { |
592 | struct pingfakehdr *pfh = (struct pingfakehdr *)from; | |
593 | ||
594 | if (offset == 0) { | |
595 | if (fraglen < sizeof(struct icmphdr)) | |
596 | BUG(); | |
597 | if (csum_partial_copy_fromiovecend(to + sizeof(struct icmphdr), | |
598 | pfh->iov, 0, fraglen - sizeof(struct icmphdr), | |
599 | &pfh->wcheck)) | |
600 | return -EFAULT; | |
6fa3eb70 S |
601 | } else if (offset < sizeof(struct icmphdr)) { |
602 | BUG(); | |
603 | } else { | |
604 | if (csum_partial_copy_fromiovecend | |
605 | (to, pfh->iov, offset - sizeof(struct icmphdr), | |
606 | fraglen, &pfh->wcheck)) | |
607 | return -EFAULT; | |
608 | } | |
c319b4d7 | 609 | |
6fa3eb70 S |
610 | #if IS_ENABLED(CONFIG_IPV6) |
611 | /* For IPv6, checksum each skb as we go along, as expected by | |
612 | * icmpv6_push_pending_frames. For IPv4, accumulate the checksum in | |
613 | * wcheck, it will be finalized in ping_v4_push_pending_frames. | |
614 | */ | |
615 | if (pfh->family == AF_INET6) { | |
616 | skb->csum = pfh->wcheck; | |
617 | skb->ip_summed = CHECKSUM_NONE; | |
618 | pfh->wcheck = 0; | |
c319b4d7 | 619 | } |
6fa3eb70 S |
620 | #endif |
621 | ||
c319b4d7 VK |
622 | return 0; |
623 | } | |
6fa3eb70 | 624 | EXPORT_SYMBOL_GPL(ping_getfrag); |
c319b4d7 | 625 | |
6fa3eb70 S |
626 | static int ping_v4_push_pending_frames(struct sock *sk, struct pingfakehdr *pfh, |
627 | struct flowi4 *fl4) | |
c319b4d7 VK |
628 | { |
629 | struct sk_buff *skb = skb_peek(&sk->sk_write_queue); | |
630 | ||
631 | pfh->wcheck = csum_partial((char *)&pfh->icmph, | |
632 | sizeof(struct icmphdr), pfh->wcheck); | |
633 | pfh->icmph.checksum = csum_fold(pfh->wcheck); | |
634 | memcpy(icmp_hdr(skb), &pfh->icmph, sizeof(struct icmphdr)); | |
635 | skb->ip_summed = CHECKSUM_NONE; | |
636 | return ip_push_pending_frames(sk, fl4); | |
637 | } | |
638 | ||
6fa3eb70 S |
639 | int ping_common_sendmsg(int family, struct msghdr *msg, size_t len, |
640 | void *user_icmph, size_t icmph_len) { | |
641 | u8 type, code; | |
c319b4d7 | 642 | |
4b9e9796 | 643 | if (len > 0xFFFF || len < icmph_len) |
c319b4d7 VK |
644 | return -EMSGSIZE; |
645 | ||
646 | /* | |
647 | * Check the flags. | |
648 | */ | |
649 | ||
650 | /* Mirror BSD error message compatibility */ | |
651 | if (msg->msg_flags & MSG_OOB) | |
652 | return -EOPNOTSUPP; | |
653 | ||
654 | /* | |
655 | * Fetch the ICMP header provided by the userland. | |
6fa3eb70 | 656 | * iovec is modified! The ICMP header is consumed. |
c319b4d7 | 657 | */ |
6fa3eb70 | 658 | if (memcpy_fromiovec(user_icmph, msg->msg_iov, icmph_len)) |
c319b4d7 | 659 | return -EFAULT; |
6fa3eb70 S |
660 | |
661 | if (family == AF_INET) { | |
662 | type = ((struct icmphdr *) user_icmph)->type; | |
663 | code = ((struct icmphdr *) user_icmph)->code; | |
664 | #if IS_ENABLED(CONFIG_IPV6) | |
665 | } else if (family == AF_INET6) { | |
666 | type = ((struct icmp6hdr *) user_icmph)->icmp6_type; | |
667 | code = ((struct icmp6hdr *) user_icmph)->icmp6_code; | |
668 | #endif | |
669 | } else { | |
670 | BUG(); | |
671 | } | |
672 | ||
673 | if (!ping_supported(family, type, code)) | |
c319b4d7 VK |
674 | return -EINVAL; |
675 | ||
6fa3eb70 S |
676 | return 0; |
677 | } | |
678 | EXPORT_SYMBOL_GPL(ping_common_sendmsg); | |
679 | ||
680 | int ping_v4_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, | |
681 | size_t len) | |
682 | { | |
683 | struct net *net = sock_net(sk); | |
684 | struct flowi4 fl4; | |
685 | struct inet_sock *inet = inet_sk(sk); | |
686 | struct ipcm_cookie ipc; | |
687 | struct icmphdr user_icmph; | |
688 | struct pingfakehdr pfh; | |
689 | struct rtable *rt = NULL; | |
690 | struct ip_options_data opt_copy; | |
691 | int free = 0; | |
692 | __be32 saddr, daddr, faddr; | |
693 | u8 tos; | |
694 | int err; | |
695 | ||
696 | pr_debug("ping_v4_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num); | |
697 | ||
698 | err = ping_common_sendmsg(AF_INET, msg, len, &user_icmph, | |
699 | sizeof(user_icmph)); | |
700 | if (err) | |
701 | return err; | |
702 | ||
c319b4d7 VK |
703 | /* |
704 | * Get and verify the address. | |
705 | */ | |
706 | ||
707 | if (msg->msg_name) { | |
708 | struct sockaddr_in *usin = (struct sockaddr_in *)msg->msg_name; | |
709 | if (msg->msg_namelen < sizeof(*usin)) | |
710 | return -EINVAL; | |
711 | if (usin->sin_family != AF_INET) | |
712 | return -EINVAL; | |
713 | daddr = usin->sin_addr.s_addr; | |
714 | /* no remote port */ | |
715 | } else { | |
716 | if (sk->sk_state != TCP_ESTABLISHED) | |
717 | return -EDESTADDRREQ; | |
718 | daddr = inet->inet_daddr; | |
719 | /* no remote port */ | |
720 | } | |
721 | ||
722 | ipc.addr = inet->inet_saddr; | |
723 | ipc.opt = NULL; | |
724 | ipc.oif = sk->sk_bound_dev_if; | |
725 | ipc.tx_flags = 0; | |
bf84a010 DB |
726 | |
727 | sock_tx_timestamp(sk, &ipc.tx_flags); | |
c319b4d7 VK |
728 | |
729 | if (msg->msg_controllen) { | |
730 | err = ip_cmsg_send(sock_net(sk), msg, &ipc); | |
731 | if (err) | |
732 | return err; | |
733 | if (ipc.opt) | |
734 | free = 1; | |
735 | } | |
736 | if (!ipc.opt) { | |
737 | struct ip_options_rcu *inet_opt; | |
738 | ||
739 | rcu_read_lock(); | |
740 | inet_opt = rcu_dereference(inet->inet_opt); | |
741 | if (inet_opt) { | |
742 | memcpy(&opt_copy, inet_opt, | |
743 | sizeof(*inet_opt) + inet_opt->opt.optlen); | |
744 | ipc.opt = &opt_copy.opt; | |
745 | } | |
746 | rcu_read_unlock(); | |
747 | } | |
748 | ||
749 | saddr = ipc.addr; | |
750 | ipc.addr = faddr = daddr; | |
751 | ||
752 | if (ipc.opt && ipc.opt->opt.srr) { | |
753 | if (!daddr) | |
754 | return -EINVAL; | |
755 | faddr = ipc.opt->opt.faddr; | |
756 | } | |
757 | tos = RT_TOS(inet->tos); | |
758 | if (sock_flag(sk, SOCK_LOCALROUTE) || | |
759 | (msg->msg_flags & MSG_DONTROUTE) || | |
760 | (ipc.opt && ipc.opt->opt.is_strictroute)) { | |
761 | tos |= RTO_ONLINK; | |
762 | } | |
763 | ||
764 | if (ipv4_is_multicast(daddr)) { | |
765 | if (!ipc.oif) | |
766 | ipc.oif = inet->mc_index; | |
767 | if (!saddr) | |
768 | saddr = inet->mc_addr; | |
76e21053 EH |
769 | } else if (!ipc.oif) |
770 | ipc.oif = inet->uc_index; | |
c319b4d7 VK |
771 | |
772 | flowi4_init_output(&fl4, ipc.oif, sk->sk_mark, tos, | |
773 | RT_SCOPE_UNIVERSE, sk->sk_protocol, | |
6fa3eb70 S |
774 | inet_sk_flowi_flags(sk), faddr, saddr, 0, 0, |
775 | sock_i_uid(sk)); | |
c319b4d7 VK |
776 | |
777 | security_sk_classify_flow(sk, flowi4_to_flowi(&fl4)); | |
778 | rt = ip_route_output_flow(net, &fl4, sk); | |
779 | if (IS_ERR(rt)) { | |
780 | err = PTR_ERR(rt); | |
781 | rt = NULL; | |
782 | if (err == -ENETUNREACH) | |
6fa3eb70 | 783 | IP_INC_STATS_BH(net, IPSTATS_MIB_OUTNOROUTES); |
c319b4d7 VK |
784 | goto out; |
785 | } | |
786 | ||
787 | err = -EACCES; | |
788 | if ((rt->rt_flags & RTCF_BROADCAST) && | |
789 | !sock_flag(sk, SOCK_BROADCAST)) | |
790 | goto out; | |
791 | ||
792 | if (msg->msg_flags & MSG_CONFIRM) | |
793 | goto do_confirm; | |
794 | back_from_confirm: | |
795 | ||
796 | if (!ipc.addr) | |
797 | ipc.addr = fl4.daddr; | |
798 | ||
799 | lock_sock(sk); | |
800 | ||
801 | pfh.icmph.type = user_icmph.type; /* already checked */ | |
802 | pfh.icmph.code = user_icmph.code; /* ditto */ | |
803 | pfh.icmph.checksum = 0; | |
804 | pfh.icmph.un.echo.id = inet->inet_sport; | |
805 | pfh.icmph.un.echo.sequence = user_icmph.un.echo.sequence; | |
806 | pfh.iov = msg->msg_iov; | |
807 | pfh.wcheck = 0; | |
6fa3eb70 | 808 | pfh.family = AF_INET; |
c319b4d7 VK |
809 | |
810 | err = ip_append_data(sk, &fl4, ping_getfrag, &pfh, len, | |
811 | 0, &ipc, &rt, msg->msg_flags); | |
812 | if (err) | |
813 | ip_flush_pending_frames(sk); | |
814 | else | |
6fa3eb70 | 815 | err = ping_v4_push_pending_frames(sk, &pfh, &fl4); |
c319b4d7 VK |
816 | release_sock(sk); |
817 | ||
818 | out: | |
819 | ip_rt_put(rt); | |
820 | if (free) | |
821 | kfree(ipc.opt); | |
822 | if (!err) { | |
823 | icmp_out_count(sock_net(sk), user_icmph.type); | |
824 | return len; | |
825 | } | |
826 | return err; | |
827 | ||
828 | do_confirm: | |
829 | dst_confirm(&rt->dst); | |
830 | if (!(msg->msg_flags & MSG_PROBE) || len) | |
831 | goto back_from_confirm; | |
832 | err = 0; | |
833 | goto out; | |
834 | } | |
835 | ||
6fa3eb70 S |
836 | int ping_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
837 | size_t len, int noblock, int flags, int *addr_len) | |
c319b4d7 VK |
838 | { |
839 | struct inet_sock *isk = inet_sk(sk); | |
6fa3eb70 S |
840 | int family = sk->sk_family; |
841 | struct sockaddr_in *sin; | |
842 | struct sockaddr_in6 *sin6; | |
c319b4d7 VK |
843 | struct sk_buff *skb; |
844 | int copied, err; | |
845 | ||
846 | pr_debug("ping_recvmsg(sk=%p,sk->num=%u)\n", isk, isk->inet_num); | |
847 | ||
a5e7424d | 848 | err = -EOPNOTSUPP; |
c319b4d7 VK |
849 | if (flags & MSG_OOB) |
850 | goto out; | |
851 | ||
6fa3eb70 S |
852 | if (addr_len) { |
853 | if (family == AF_INET) | |
854 | *addr_len = sizeof(*sin); | |
855 | else if (family == AF_INET6 && addr_len) | |
856 | *addr_len = sizeof(*sin6); | |
857 | } | |
858 | ||
859 | if (flags & MSG_ERRQUEUE) { | |
860 | if (family == AF_INET) { | |
861 | return ip_recv_error(sk, msg, len, addr_len); | |
862 | #if IS_ENABLED(CONFIG_IPV6) | |
863 | } else if (family == AF_INET6) { | |
864 | return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len); | |
865 | #endif | |
866 | } | |
867 | } | |
c319b4d7 VK |
868 | |
869 | skb = skb_recv_datagram(sk, flags, noblock, &err); | |
870 | if (!skb) | |
871 | goto out; | |
872 | ||
873 | copied = skb->len; | |
874 | if (copied > len) { | |
875 | msg->msg_flags |= MSG_TRUNC; | |
876 | copied = len; | |
877 | } | |
878 | ||
879 | /* Don't bother checking the checksum */ | |
880 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
881 | if (err) | |
882 | goto done; | |
883 | ||
884 | sock_recv_timestamp(msg, sk, skb); | |
885 | ||
6fa3eb70 S |
886 | /* Copy the address and add cmsg data. */ |
887 | if (family == AF_INET) { | |
888 | sin = (struct sockaddr_in *) msg->msg_name; | |
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 | } | |
895 | if (isk->cmsg_flags) | |
896 | ip_cmsg_recv(msg, skb); | |
897 | ||
898 | #if IS_ENABLED(CONFIG_IPV6) | |
899 | } else if (family == AF_INET6) { | |
900 | struct ipv6_pinfo *np = inet6_sk(sk); | |
901 | struct ipv6hdr *ip6 = ipv6_hdr(skb); | |
902 | sin6 = (struct sockaddr_in6 *) msg->msg_name; | |
903 | ||
904 | if (sin6) { | |
905 | sin6->sin6_family = AF_INET6; | |
906 | sin6->sin6_port = 0; | |
907 | sin6->sin6_addr = ip6->saddr; | |
908 | sin6->sin6_flowinfo = 0; | |
909 | if (np->sndflow) | |
910 | sin6->sin6_flowinfo = ip6_flowinfo(ip6); | |
911 | sin6->sin6_scope_id = | |
912 | ipv6_iface_scope_id(&sin6->sin6_addr, | |
913 | IP6CB(skb)->iif); | |
914 | } | |
a2214488 | 915 | |
6fa3eb70 S |
916 | if (inet6_sk(sk)->rxopt.all) |
917 | pingv6_ops.ip6_datagram_recv_ctl(sk, msg, skb); | |
918 | #endif | |
919 | } else { | |
920 | BUG(); | |
c319b4d7 | 921 | } |
6fa3eb70 | 922 | |
c319b4d7 VK |
923 | err = copied; |
924 | ||
925 | done: | |
926 | skb_free_datagram(sk, skb); | |
927 | out: | |
928 | pr_debug("ping_recvmsg -> %d\n", err); | |
929 | return err; | |
930 | } | |
6fa3eb70 | 931 | EXPORT_SYMBOL_GPL(ping_recvmsg); |
c319b4d7 | 932 | |
6fa3eb70 | 933 | int ping_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
c319b4d7 VK |
934 | { |
935 | pr_debug("ping_queue_rcv_skb(sk=%p,sk->num=%d,skb=%p)\n", | |
058bd4d2 | 936 | inet_sk(sk), inet_sk(sk)->inet_num, skb); |
c319b4d7 | 937 | if (sock_queue_rcv_skb(sk, skb) < 0) { |
c319b4d7 VK |
938 | kfree_skb(skb); |
939 | pr_debug("ping_queue_rcv_skb -> failed\n"); | |
940 | return -1; | |
941 | } | |
942 | return 0; | |
943 | } | |
6fa3eb70 | 944 | EXPORT_SYMBOL_GPL(ping_queue_rcv_skb); |
c319b4d7 VK |
945 | |
946 | ||
947 | /* | |
948 | * All we need to do is get the socket. | |
949 | */ | |
950 | ||
951 | void ping_rcv(struct sk_buff *skb) | |
952 | { | |
953 | struct sock *sk; | |
954 | struct net *net = dev_net(skb->dev); | |
c319b4d7 | 955 | struct icmphdr *icmph = icmp_hdr(skb); |
c319b4d7 VK |
956 | |
957 | /* We assume the packet has already been checked by icmp_rcv */ | |
958 | ||
959 | pr_debug("ping_rcv(skb=%p,id=%04x,seq=%04x)\n", | |
058bd4d2 | 960 | skb, ntohs(icmph->un.echo.id), ntohs(icmph->un.echo.sequence)); |
c319b4d7 VK |
961 | |
962 | /* Push ICMP header back */ | |
963 | skb_push(skb, skb->data - (u8 *)icmph); | |
964 | ||
6fa3eb70 | 965 | sk = ping_lookup(net, skb, ntohs(icmph->un.echo.id)); |
c319b4d7 | 966 | if (sk != NULL) { |
6fa3eb70 S |
967 | #ifdef CONFIG_MTK_NET_LOGGING |
968 | printk(KERN_INFO "[mtk_net][ping_debug]rcv on sk %p\n", sk); | |
969 | #endif | |
c319b4d7 | 970 | ping_queue_rcv_skb(sk, skb_get(skb)); |
6fa3eb70 S |
971 | /*mtk_net: don't put sock here, do sock_put after free skb*/ |
972 | /* sock_put(sk); */ | |
c319b4d7 VK |
973 | return; |
974 | } | |
6fa3eb70 | 975 | pr_info("[mtk_net][ping_debug]no socket, dropping\n"); |
c319b4d7 VK |
976 | |
977 | /* We're called from icmp_rcv(). kfree_skb() is done there. */ | |
978 | } | |
6fa3eb70 | 979 | EXPORT_SYMBOL_GPL(ping_rcv); |
c319b4d7 VK |
980 | |
981 | struct proto ping_prot = { | |
982 | .name = "PING", | |
983 | .owner = THIS_MODULE, | |
984 | .init = ping_init_sock, | |
985 | .close = ping_close, | |
986 | .connect = ip4_datagram_connect, | |
987 | .disconnect = udp_disconnect, | |
c319b4d7 VK |
988 | .setsockopt = ip_setsockopt, |
989 | .getsockopt = ip_getsockopt, | |
6fa3eb70 | 990 | .sendmsg = ping_v4_sendmsg, |
c319b4d7 VK |
991 | .recvmsg = ping_recvmsg, |
992 | .bind = ping_bind, | |
993 | .backlog_rcv = ping_queue_rcv_skb, | |
8141ed9f | 994 | .release_cb = ip4_datagram_release_cb, |
6fa3eb70 S |
995 | .hash = ping_hash, |
996 | .unhash = ping_unhash, | |
997 | .get_port = ping_get_port, | |
c319b4d7 VK |
998 | .obj_size = sizeof(struct inet_sock), |
999 | }; | |
1000 | EXPORT_SYMBOL(ping_prot); | |
1001 | ||
1002 | #ifdef CONFIG_PROC_FS | |
1003 | ||
1004 | static struct sock *ping_get_first(struct seq_file *seq, int start) | |
1005 | { | |
1006 | struct sock *sk; | |
1007 | struct ping_iter_state *state = seq->private; | |
1008 | struct net *net = seq_file_net(seq); | |
1009 | ||
1010 | for (state->bucket = start; state->bucket < PING_HTABLE_SIZE; | |
1011 | ++state->bucket) { | |
1012 | struct hlist_nulls_node *node; | |
75e308c8 CG |
1013 | struct hlist_nulls_head *hslot; |
1014 | ||
1015 | hslot = &ping_table.hash[state->bucket]; | |
c319b4d7 VK |
1016 | |
1017 | if (hlist_nulls_empty(hslot)) | |
1018 | continue; | |
1019 | ||
1020 | sk_nulls_for_each(sk, node, hslot) { | |
6fa3eb70 S |
1021 | if (net_eq(sock_net(sk), net) && |
1022 | sk->sk_family == state->family) | |
c319b4d7 VK |
1023 | goto found; |
1024 | } | |
1025 | } | |
1026 | sk = NULL; | |
1027 | found: | |
1028 | return sk; | |
1029 | } | |
1030 | ||
1031 | static struct sock *ping_get_next(struct seq_file *seq, struct sock *sk) | |
1032 | { | |
1033 | struct ping_iter_state *state = seq->private; | |
1034 | struct net *net = seq_file_net(seq); | |
1035 | ||
1036 | do { | |
1037 | sk = sk_nulls_next(sk); | |
1038 | } while (sk && (!net_eq(sock_net(sk), net))); | |
1039 | ||
1040 | if (!sk) | |
1041 | return ping_get_first(seq, state->bucket + 1); | |
1042 | return sk; | |
1043 | } | |
1044 | ||
1045 | static struct sock *ping_get_idx(struct seq_file *seq, loff_t pos) | |
1046 | { | |
1047 | struct sock *sk = ping_get_first(seq, 0); | |
1048 | ||
1049 | if (sk) | |
1050 | while (pos && (sk = ping_get_next(seq, sk)) != NULL) | |
1051 | --pos; | |
1052 | return pos ? NULL : sk; | |
1053 | } | |
1054 | ||
6fa3eb70 | 1055 | void *ping_seq_start(struct seq_file *seq, loff_t *pos, sa_family_t family) |
c319b4d7 VK |
1056 | { |
1057 | struct ping_iter_state *state = seq->private; | |
1058 | state->bucket = 0; | |
6fa3eb70 | 1059 | state->family = family; |
c319b4d7 VK |
1060 | |
1061 | read_lock_bh(&ping_table.lock); | |
1062 | ||
1063 | return *pos ? ping_get_idx(seq, *pos-1) : SEQ_START_TOKEN; | |
1064 | } | |
6fa3eb70 S |
1065 | EXPORT_SYMBOL_GPL(ping_seq_start); |
1066 | ||
1067 | static void *ping_v4_seq_start(struct seq_file *seq, loff_t *pos) | |
1068 | { | |
1069 | return ping_seq_start(seq, pos, AF_INET); | |
1070 | } | |
c319b4d7 | 1071 | |
6fa3eb70 | 1072 | void *ping_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
c319b4d7 VK |
1073 | { |
1074 | struct sock *sk; | |
1075 | ||
1076 | if (v == SEQ_START_TOKEN) | |
1077 | sk = ping_get_idx(seq, 0); | |
1078 | else | |
1079 | sk = ping_get_next(seq, v); | |
1080 | ||
1081 | ++*pos; | |
1082 | return sk; | |
1083 | } | |
6fa3eb70 | 1084 | EXPORT_SYMBOL_GPL(ping_seq_next); |
c319b4d7 | 1085 | |
6fa3eb70 | 1086 | void ping_seq_stop(struct seq_file *seq, void *v) |
c319b4d7 VK |
1087 | { |
1088 | read_unlock_bh(&ping_table.lock); | |
1089 | } | |
6fa3eb70 | 1090 | EXPORT_SYMBOL_GPL(ping_seq_stop); |
c319b4d7 | 1091 | |
6fa3eb70 | 1092 | static void ping_v4_format_sock(struct sock *sp, struct seq_file *f, |
c319b4d7 VK |
1093 | int bucket, int *len) |
1094 | { | |
1095 | struct inet_sock *inet = inet_sk(sp); | |
1096 | __be32 dest = inet->inet_daddr; | |
1097 | __be32 src = inet->inet_rcv_saddr; | |
1098 | __u16 destp = ntohs(inet->inet_dport); | |
1099 | __u16 srcp = ntohs(inet->inet_sport); | |
1100 | ||
1101 | seq_printf(f, "%5d: %08X:%04X %08X:%04X" | |
1102 | " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %d%n", | |
1103 | bucket, src, srcp, dest, destp, sp->sk_state, | |
1104 | sk_wmem_alloc_get(sp), | |
1105 | sk_rmem_alloc_get(sp), | |
a7cb5a49 EB |
1106 | 0, 0L, 0, |
1107 | from_kuid_munged(seq_user_ns(f), sock_i_uid(sp)), | |
1108 | 0, sock_i_ino(sp), | |
c319b4d7 VK |
1109 | atomic_read(&sp->sk_refcnt), sp, |
1110 | atomic_read(&sp->sk_drops), len); | |
1111 | } | |
1112 | ||
6fa3eb70 | 1113 | static int ping_v4_seq_show(struct seq_file *seq, void *v) |
c319b4d7 VK |
1114 | { |
1115 | if (v == SEQ_START_TOKEN) | |
1116 | seq_printf(seq, "%-127s\n", | |
1117 | " sl local_address rem_address st tx_queue " | |
1118 | "rx_queue tr tm->when retrnsmt uid timeout " | |
1119 | "inode ref pointer drops"); | |
1120 | else { | |
1121 | struct ping_iter_state *state = seq->private; | |
1122 | int len; | |
1123 | ||
6fa3eb70 | 1124 | ping_v4_format_sock(v, seq, state->bucket, &len); |
c319b4d7 VK |
1125 | seq_printf(seq, "%*s\n", 127 - len, ""); |
1126 | } | |
1127 | return 0; | |
1128 | } | |
1129 | ||
6fa3eb70 S |
1130 | static const struct seq_operations ping_v4_seq_ops = { |
1131 | .show = ping_v4_seq_show, | |
1132 | .start = ping_v4_seq_start, | |
c319b4d7 VK |
1133 | .next = ping_seq_next, |
1134 | .stop = ping_seq_stop, | |
1135 | }; | |
1136 | ||
1137 | static int ping_seq_open(struct inode *inode, struct file *file) | |
1138 | { | |
6fa3eb70 S |
1139 | struct ping_seq_afinfo *afinfo = PDE_DATA(inode); |
1140 | return seq_open_net(inode, file, &afinfo->seq_ops, | |
c319b4d7 VK |
1141 | sizeof(struct ping_iter_state)); |
1142 | } | |
1143 | ||
6fa3eb70 | 1144 | const struct file_operations ping_seq_fops = { |
c319b4d7 VK |
1145 | .open = ping_seq_open, |
1146 | .read = seq_read, | |
1147 | .llseek = seq_lseek, | |
1148 | .release = seq_release_net, | |
1149 | }; | |
6fa3eb70 S |
1150 | EXPORT_SYMBOL_GPL(ping_seq_fops); |
1151 | ||
1152 | static struct ping_seq_afinfo ping_v4_seq_afinfo = { | |
1153 | .name = "icmp", | |
1154 | .family = AF_INET, | |
1155 | .seq_fops = &ping_seq_fops, | |
1156 | .seq_ops = { | |
1157 | .start = ping_v4_seq_start, | |
1158 | .show = ping_v4_seq_show, | |
1159 | .next = ping_seq_next, | |
1160 | .stop = ping_seq_stop, | |
1161 | }, | |
1162 | }; | |
c319b4d7 | 1163 | |
6fa3eb70 | 1164 | int ping_proc_register(struct net *net, struct ping_seq_afinfo *afinfo) |
c319b4d7 VK |
1165 | { |
1166 | struct proc_dir_entry *p; | |
6fa3eb70 S |
1167 | p = proc_create_data(afinfo->name, S_IRUGO, net->proc_net, |
1168 | afinfo->seq_fops, afinfo); | |
c319b4d7 | 1169 | if (!p) |
6fa3eb70 S |
1170 | return -ENOMEM; |
1171 | return 0; | |
c319b4d7 | 1172 | } |
6fa3eb70 | 1173 | EXPORT_SYMBOL_GPL(ping_proc_register); |
c319b4d7 | 1174 | |
6fa3eb70 | 1175 | void ping_proc_unregister(struct net *net, struct ping_seq_afinfo *afinfo) |
c319b4d7 | 1176 | { |
6fa3eb70 | 1177 | remove_proc_entry(afinfo->name, net->proc_net); |
c319b4d7 | 1178 | } |
6fa3eb70 | 1179 | EXPORT_SYMBOL_GPL(ping_proc_unregister); |
c319b4d7 | 1180 | |
6fa3eb70 | 1181 | static int __net_init ping_v4_proc_init_net(struct net *net) |
c319b4d7 | 1182 | { |
6fa3eb70 | 1183 | return ping_proc_register(net, &ping_v4_seq_afinfo); |
c319b4d7 VK |
1184 | } |
1185 | ||
6fa3eb70 | 1186 | static void __net_exit ping_v4_proc_exit_net(struct net *net) |
c319b4d7 | 1187 | { |
6fa3eb70 | 1188 | ping_proc_unregister(net, &ping_v4_seq_afinfo); |
c319b4d7 VK |
1189 | } |
1190 | ||
6fa3eb70 S |
1191 | static struct pernet_operations ping_v4_net_ops = { |
1192 | .init = ping_v4_proc_init_net, | |
1193 | .exit = ping_v4_proc_exit_net, | |
c319b4d7 VK |
1194 | }; |
1195 | ||
1196 | int __init ping_proc_init(void) | |
1197 | { | |
6fa3eb70 | 1198 | return register_pernet_subsys(&ping_v4_net_ops); |
c319b4d7 VK |
1199 | } |
1200 | ||
1201 | void ping_proc_exit(void) | |
1202 | { | |
6fa3eb70 | 1203 | unregister_pernet_subsys(&ping_v4_net_ops); |
c319b4d7 VK |
1204 | } |
1205 | ||
1206 | #endif | |
1207 | ||
1208 | void __init ping_init(void) | |
1209 | { | |
1210 | int i; | |
1211 | ||
1212 | for (i = 0; i < PING_HTABLE_SIZE; i++) | |
1213 | INIT_HLIST_NULLS_HEAD(&ping_table.hash[i], i); | |
1214 | rwlock_init(&ping_table.lock); | |
1215 | } |