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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
c319b4d7 VK |
2 | /* |
3 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
4 | * operating system. INET is implemented using the BSD Socket | |
5 | * interface as the means of communication with the user level. | |
6 | * | |
7 | * "Ping" sockets | |
8 | * | |
c319b4d7 VK |
9 | * Based on ipv4/udp.c code. |
10 | * | |
11 | * Authors: Vasiliy Kulikov / Openwall (for Linux 2.6), | |
12 | * Pavel Kankovsky (for Linux 2.4.32) | |
13 | * | |
14 | * Pavel gave all rights to bugs to Vasiliy, | |
15 | * none of the bugs are Pavel's now. | |
c319b4d7 VK |
16 | */ |
17 | ||
c319b4d7 | 18 | #include <linux/uaccess.h> |
c319b4d7 VK |
19 | #include <linux/types.h> |
20 | #include <linux/fcntl.h> | |
21 | #include <linux/socket.h> | |
22 | #include <linux/sockios.h> | |
23 | #include <linux/in.h> | |
24 | #include <linux/errno.h> | |
25 | #include <linux/timer.h> | |
26 | #include <linux/mm.h> | |
27 | #include <linux/inet.h> | |
28 | #include <linux/netdevice.h> | |
29 | #include <net/snmp.h> | |
30 | #include <net/ip.h> | |
c319b4d7 VK |
31 | #include <net/icmp.h> |
32 | #include <net/protocol.h> | |
33 | #include <linux/skbuff.h> | |
34 | #include <linux/proc_fs.h> | |
bc3b2d7f | 35 | #include <linux/export.h> |
c319b4d7 VK |
36 | #include <net/sock.h> |
37 | #include <net/ping.h> | |
c319b4d7 VK |
38 | #include <net/udp.h> |
39 | #include <net/route.h> | |
40 | #include <net/inet_common.h> | |
41 | #include <net/checksum.h> | |
42 | ||
6d0bfe22 LC |
43 | #if IS_ENABLED(CONFIG_IPV6) |
44 | #include <linux/in6.h> | |
45 | #include <linux/icmpv6.h> | |
46 | #include <net/addrconf.h> | |
47 | #include <net/ipv6.h> | |
48 | #include <net/transp_v6.h> | |
49 | #endif | |
50 | ||
ea074b34 SH |
51 | struct ping_table { |
52 | struct hlist_nulls_head hash[PING_HTABLE_SIZE]; | |
53 | rwlock_t lock; | |
54 | }; | |
c319b4d7 | 55 | |
ea074b34 | 56 | static struct ping_table ping_table; |
6d0bfe22 LC |
57 | struct pingv6_ops pingv6_ops; |
58 | EXPORT_SYMBOL_GPL(pingv6_ops); | |
c319b4d7 | 59 | |
1b1cb1f7 | 60 | static u16 ping_port_rover; |
c319b4d7 | 61 | |
6eada011 | 62 | static inline u32 ping_hashfn(const struct net *net, u32 num, u32 mask) |
c319b4d7 | 63 | { |
6eada011 | 64 | u32 res = (num + net_hash_mix(net)) & mask; |
95c96174 | 65 | |
6eada011 | 66 | pr_debug("hash(%u) = %u\n", num, res); |
c319b4d7 VK |
67 | return res; |
68 | } | |
6d0bfe22 | 69 | EXPORT_SYMBOL_GPL(ping_hash); |
c319b4d7 VK |
70 | |
71 | static inline struct hlist_nulls_head *ping_hashslot(struct ping_table *table, | |
95c96174 | 72 | struct net *net, unsigned int num) |
c319b4d7 VK |
73 | { |
74 | return &table->hash[ping_hashfn(net, num, PING_HTABLE_MASK)]; | |
75 | } | |
76 | ||
6d0bfe22 | 77 | int ping_get_port(struct sock *sk, unsigned short ident) |
c319b4d7 VK |
78 | { |
79 | struct hlist_nulls_node *node; | |
80 | struct hlist_nulls_head *hlist; | |
81 | struct inet_sock *isk, *isk2; | |
82 | struct sock *sk2 = NULL; | |
83 | ||
84 | isk = inet_sk(sk); | |
85 | write_lock_bh(&ping_table.lock); | |
86 | if (ident == 0) { | |
87 | u32 i; | |
88 | u16 result = ping_port_rover + 1; | |
89 | ||
90 | for (i = 0; i < (1L << 16); i++, result++) { | |
91 | if (!result) | |
92 | result++; /* avoid zero */ | |
93 | hlist = ping_hashslot(&ping_table, sock_net(sk), | |
94 | result); | |
95 | ping_portaddr_for_each_entry(sk2, node, hlist) { | |
96 | isk2 = inet_sk(sk2); | |
97 | ||
98 | if (isk2->inet_num == result) | |
99 | goto next_port; | |
100 | } | |
101 | ||
102 | /* found */ | |
103 | ping_port_rover = ident = result; | |
104 | break; | |
105 | next_port: | |
106 | ; | |
107 | } | |
108 | if (i >= (1L << 16)) | |
109 | goto fail; | |
110 | } else { | |
111 | hlist = ping_hashslot(&ping_table, sock_net(sk), ident); | |
112 | ping_portaddr_for_each_entry(sk2, node, hlist) { | |
113 | isk2 = inet_sk(sk2); | |
114 | ||
6d0bfe22 LC |
115 | /* BUG? Why is this reuse and not reuseaddr? ping.c |
116 | * doesn't turn off SO_REUSEADDR, and it doesn't expect | |
117 | * that other ping processes can steal its packets. | |
118 | */ | |
c319b4d7 VK |
119 | if ((isk2->inet_num == ident) && |
120 | (sk2 != sk) && | |
121 | (!sk2->sk_reuse || !sk->sk_reuse)) | |
122 | goto fail; | |
123 | } | |
124 | } | |
125 | ||
126 | pr_debug("found port/ident = %d\n", ident); | |
127 | isk->inet_num = ident; | |
128 | if (sk_unhashed(sk)) { | |
129 | pr_debug("was not hashed\n"); | |
130 | sock_hold(sk); | |
131 | hlist_nulls_add_head(&sk->sk_nulls_node, hlist); | |
132 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); | |
133 | } | |
134 | write_unlock_bh(&ping_table.lock); | |
135 | return 0; | |
136 | ||
137 | fail: | |
138 | write_unlock_bh(&ping_table.lock); | |
139 | return 1; | |
140 | } | |
6d0bfe22 | 141 | EXPORT_SYMBOL_GPL(ping_get_port); |
c319b4d7 | 142 | |
086c653f | 143 | int ping_hash(struct sock *sk) |
c319b4d7 | 144 | { |
6d0bfe22 | 145 | pr_debug("ping_hash(sk->port=%u)\n", inet_sk(sk)->inet_num); |
c319b4d7 | 146 | BUG(); /* "Please do not press this button again." */ |
086c653f CG |
147 | |
148 | return 0; | |
c319b4d7 VK |
149 | } |
150 | ||
6d0bfe22 | 151 | void ping_unhash(struct sock *sk) |
c319b4d7 VK |
152 | { |
153 | struct inet_sock *isk = inet_sk(sk); | |
43a66845 | 154 | |
6d0bfe22 | 155 | pr_debug("ping_unhash(isk=%p,isk->num=%u)\n", isk, isk->inet_num); |
43a66845 | 156 | write_lock_bh(&ping_table.lock); |
c319b4d7 | 157 | if (sk_hashed(sk)) { |
c319b4d7 | 158 | hlist_nulls_del(&sk->sk_nulls_node); |
a134f083 | 159 | sk_nulls_node_init(&sk->sk_nulls_node); |
c319b4d7 | 160 | sock_put(sk); |
747465ef ED |
161 | isk->inet_num = 0; |
162 | isk->inet_sport = 0; | |
c319b4d7 | 163 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); |
c319b4d7 | 164 | } |
43a66845 | 165 | write_unlock_bh(&ping_table.lock); |
c319b4d7 | 166 | } |
6d0bfe22 | 167 | EXPORT_SYMBOL_GPL(ping_unhash); |
c319b4d7 | 168 | |
6d0bfe22 | 169 | static struct sock *ping_lookup(struct net *net, struct sk_buff *skb, u16 ident) |
c319b4d7 VK |
170 | { |
171 | struct hlist_nulls_head *hslot = ping_hashslot(&ping_table, net, ident); | |
172 | struct sock *sk = NULL; | |
173 | struct inet_sock *isk; | |
174 | struct hlist_nulls_node *hnode; | |
6d0bfe22 LC |
175 | int dif = skb->dev->ifindex; |
176 | ||
177 | if (skb->protocol == htons(ETH_P_IP)) { | |
178 | pr_debug("try to find: num = %d, daddr = %pI4, dif = %d\n", | |
179 | (int)ident, &ip_hdr(skb)->daddr, dif); | |
180 | #if IS_ENABLED(CONFIG_IPV6) | |
181 | } else if (skb->protocol == htons(ETH_P_IPV6)) { | |
182 | pr_debug("try to find: num = %d, daddr = %pI6c, dif = %d\n", | |
183 | (int)ident, &ipv6_hdr(skb)->daddr, dif); | |
184 | #endif | |
185 | } | |
c319b4d7 | 186 | |
c319b4d7 VK |
187 | read_lock_bh(&ping_table.lock); |
188 | ||
189 | ping_portaddr_for_each_entry(sk, hnode, hslot) { | |
190 | isk = inet_sk(sk); | |
191 | ||
c319b4d7 VK |
192 | pr_debug("iterate\n"); |
193 | if (isk->inet_num != ident) | |
194 | continue; | |
6d0bfe22 LC |
195 | |
196 | if (skb->protocol == htons(ETH_P_IP) && | |
197 | sk->sk_family == AF_INET) { | |
198 | pr_debug("found: %p: num=%d, daddr=%pI4, dif=%d\n", sk, | |
199 | (int) isk->inet_num, &isk->inet_rcv_saddr, | |
200 | sk->sk_bound_dev_if); | |
201 | ||
202 | if (isk->inet_rcv_saddr && | |
203 | isk->inet_rcv_saddr != ip_hdr(skb)->daddr) | |
204 | continue; | |
205 | #if IS_ENABLED(CONFIG_IPV6) | |
206 | } else if (skb->protocol == htons(ETH_P_IPV6) && | |
207 | sk->sk_family == AF_INET6) { | |
6d0bfe22 LC |
208 | |
209 | pr_debug("found: %p: num=%d, daddr=%pI6c, dif=%d\n", sk, | |
210 | (int) isk->inet_num, | |
efe4208f | 211 | &sk->sk_v6_rcv_saddr, |
6d0bfe22 LC |
212 | sk->sk_bound_dev_if); |
213 | ||
efe4208f ED |
214 | if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) && |
215 | !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, | |
6d0bfe22 LC |
216 | &ipv6_hdr(skb)->daddr)) |
217 | continue; | |
218 | #endif | |
91a0b603 JZ |
219 | } else { |
220 | continue; | |
6d0bfe22 LC |
221 | } |
222 | ||
c319b4d7 VK |
223 | if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) |
224 | continue; | |
225 | ||
226 | sock_hold(sk); | |
227 | goto exit; | |
228 | } | |
229 | ||
230 | sk = NULL; | |
231 | exit: | |
232 | read_unlock_bh(&ping_table.lock); | |
233 | ||
234 | return sk; | |
235 | } | |
236 | ||
7064d16e EB |
237 | static void inet_get_ping_group_range_net(struct net *net, kgid_t *low, |
238 | kgid_t *high) | |
f56e03e8 | 239 | { |
ba6b918a | 240 | kgid_t *data = net->ipv4.ping_group_range.range; |
95c96174 ED |
241 | unsigned int seq; |
242 | ||
f56e03e8 | 243 | do { |
ba6b918a | 244 | seq = read_seqbegin(&net->ipv4.ping_group_range.lock); |
f56e03e8 VK |
245 | |
246 | *low = data[0]; | |
247 | *high = data[1]; | |
ba6b918a | 248 | } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq)); |
f56e03e8 VK |
249 | } |
250 | ||
251 | ||
6d0bfe22 | 252 | int ping_init_sock(struct sock *sk) |
c319b4d7 VK |
253 | { |
254 | struct net *net = sock_net(sk); | |
7064d16e | 255 | kgid_t group = current_egid(); |
b04c4619 | 256 | struct group_info *group_info; |
81243eac | 257 | int i; |
ae2975bc | 258 | kgid_t low, high; |
b04c4619 | 259 | int ret = 0; |
c319b4d7 | 260 | |
9145736d LC |
261 | if (sk->sk_family == AF_INET6) |
262 | sk->sk_ipv6only = 1; | |
263 | ||
7064d16e EB |
264 | inet_get_ping_group_range_net(net, &low, &high); |
265 | if (gid_lte(low, group) && gid_lte(group, high)) | |
c319b4d7 VK |
266 | return 0; |
267 | ||
b04c4619 | 268 | group_info = get_current_groups(); |
81243eac AD |
269 | for (i = 0; i < group_info->ngroups; i++) { |
270 | kgid_t gid = group_info->gid[i]; | |
c319b4d7 | 271 | |
81243eac AD |
272 | if (gid_lte(low, gid) && gid_lte(gid, high)) |
273 | goto out_release_group; | |
c319b4d7 VK |
274 | } |
275 | ||
b04c4619 WX |
276 | ret = -EACCES; |
277 | ||
278 | out_release_group: | |
279 | put_group_info(group_info); | |
280 | return ret; | |
c319b4d7 | 281 | } |
6d0bfe22 | 282 | EXPORT_SYMBOL_GPL(ping_init_sock); |
c319b4d7 | 283 | |
6d0bfe22 | 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); |
41c6d650 | 288 | pr_debug("isk->refcnt = %d\n", refcount_read(&sk->sk_refcnt)); |
c319b4d7 VK |
289 | |
290 | sk_common_release(sk); | |
291 | } | |
6d0bfe22 LC |
292 | EXPORT_SYMBOL_GPL(ping_close); |
293 | ||
294 | /* Checks the bind address and possibly modifies sk->sk_bound_dev_if. */ | |
a06a2d37 WF |
295 | static int ping_check_bind_addr(struct sock *sk, struct inet_sock *isk, |
296 | struct sockaddr *uaddr, int addr_len) { | |
6d0bfe22 LC |
297 | struct net *net = sock_net(sk); |
298 | if (sk->sk_family == AF_INET) { | |
299 | struct sockaddr_in *addr = (struct sockaddr_in *) uaddr; | |
300 | int chk_addr_ret; | |
301 | ||
302 | if (addr_len < sizeof(*addr)) | |
303 | return -EINVAL; | |
304 | ||
9145736d LC |
305 | if (addr->sin_family != AF_INET && |
306 | !(addr->sin_family == AF_UNSPEC && | |
307 | addr->sin_addr.s_addr == htonl(INADDR_ANY))) | |
308 | return -EAFNOSUPPORT; | |
309 | ||
6d0bfe22 LC |
310 | pr_debug("ping_check_bind_addr(sk=%p,addr=%pI4,port=%d)\n", |
311 | sk, &addr->sin_addr.s_addr, ntohs(addr->sin_port)); | |
312 | ||
313 | chk_addr_ret = inet_addr_type(net, addr->sin_addr.s_addr); | |
314 | ||
315 | if (addr->sin_addr.s_addr == htonl(INADDR_ANY)) | |
316 | chk_addr_ret = RTN_LOCAL; | |
317 | ||
83ba4645 | 318 | if ((!inet_can_nonlocal_bind(net, isk) && |
6d0bfe22 LC |
319 | chk_addr_ret != RTN_LOCAL) || |
320 | chk_addr_ret == RTN_MULTICAST || | |
321 | chk_addr_ret == RTN_BROADCAST) | |
322 | return -EADDRNOTAVAIL; | |
323 | ||
324 | #if IS_ENABLED(CONFIG_IPV6) | |
325 | } else if (sk->sk_family == AF_INET6) { | |
326 | struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr; | |
327 | int addr_type, scoped, has_addr; | |
328 | struct net_device *dev = NULL; | |
329 | ||
330 | if (addr_len < sizeof(*addr)) | |
331 | return -EINVAL; | |
332 | ||
82b276cd | 333 | if (addr->sin6_family != AF_INET6) |
9145736d | 334 | return -EAFNOSUPPORT; |
82b276cd | 335 | |
6d0bfe22 LC |
336 | pr_debug("ping_check_bind_addr(sk=%p,addr=%pI6c,port=%d)\n", |
337 | sk, addr->sin6_addr.s6_addr, ntohs(addr->sin6_port)); | |
338 | ||
339 | addr_type = ipv6_addr_type(&addr->sin6_addr); | |
340 | scoped = __ipv6_addr_needs_scope_id(addr_type); | |
341 | if ((addr_type != IPV6_ADDR_ANY && | |
342 | !(addr_type & IPV6_ADDR_UNICAST)) || | |
343 | (scoped && !addr->sin6_scope_id)) | |
344 | return -EINVAL; | |
345 | ||
346 | rcu_read_lock(); | |
347 | if (addr->sin6_scope_id) { | |
348 | dev = dev_get_by_index_rcu(net, addr->sin6_scope_id); | |
349 | if (!dev) { | |
350 | rcu_read_unlock(); | |
351 | return -ENODEV; | |
352 | } | |
353 | } | |
354 | has_addr = pingv6_ops.ipv6_chk_addr(net, &addr->sin6_addr, dev, | |
355 | scoped); | |
356 | rcu_read_unlock(); | |
357 | ||
83ba4645 | 358 | if (!(ipv6_can_nonlocal_bind(net, isk) || has_addr || |
6d0bfe22 LC |
359 | addr_type == IPV6_ADDR_ANY)) |
360 | return -EADDRNOTAVAIL; | |
361 | ||
362 | if (scoped) | |
363 | sk->sk_bound_dev_if = addr->sin6_scope_id; | |
364 | #endif | |
365 | } else { | |
366 | return -EAFNOSUPPORT; | |
367 | } | |
368 | return 0; | |
369 | } | |
370 | ||
a06a2d37 | 371 | static void ping_set_saddr(struct sock *sk, struct sockaddr *saddr) |
6d0bfe22 LC |
372 | { |
373 | if (saddr->sa_family == AF_INET) { | |
374 | struct inet_sock *isk = inet_sk(sk); | |
375 | struct sockaddr_in *addr = (struct sockaddr_in *) saddr; | |
376 | isk->inet_rcv_saddr = isk->inet_saddr = addr->sin_addr.s_addr; | |
377 | #if IS_ENABLED(CONFIG_IPV6) | |
378 | } else if (saddr->sa_family == AF_INET6) { | |
379 | struct sockaddr_in6 *addr = (struct sockaddr_in6 *) saddr; | |
380 | struct ipv6_pinfo *np = inet6_sk(sk); | |
efe4208f | 381 | sk->sk_v6_rcv_saddr = np->saddr = addr->sin6_addr; |
6d0bfe22 LC |
382 | #endif |
383 | } | |
384 | } | |
c319b4d7 | 385 | |
a06a2d37 | 386 | static void ping_clear_saddr(struct sock *sk, int dif) |
6d0bfe22 LC |
387 | { |
388 | sk->sk_bound_dev_if = dif; | |
389 | if (sk->sk_family == AF_INET) { | |
390 | struct inet_sock *isk = inet_sk(sk); | |
391 | isk->inet_rcv_saddr = isk->inet_saddr = 0; | |
392 | #if IS_ENABLED(CONFIG_IPV6) | |
393 | } else if (sk->sk_family == AF_INET6) { | |
394 | struct ipv6_pinfo *np = inet6_sk(sk); | |
efe4208f | 395 | memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr)); |
6d0bfe22 LC |
396 | memset(&np->saddr, 0, sizeof(np->saddr)); |
397 | #endif | |
398 | } | |
399 | } | |
c319b4d7 VK |
400 | /* |
401 | * We need our own bind because there are no privileged id's == local ports. | |
402 | * Moreover, we don't allow binding to multi- and broadcast addresses. | |
403 | */ | |
404 | ||
6d0bfe22 | 405 | int ping_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) |
c319b4d7 | 406 | { |
c319b4d7 VK |
407 | struct inet_sock *isk = inet_sk(sk); |
408 | unsigned short snum; | |
c319b4d7 | 409 | int err; |
6d0bfe22 | 410 | int dif = sk->sk_bound_dev_if; |
c319b4d7 | 411 | |
6d0bfe22 LC |
412 | err = ping_check_bind_addr(sk, isk, uaddr, addr_len); |
413 | if (err) | |
414 | return err; | |
c319b4d7 VK |
415 | |
416 | lock_sock(sk); | |
417 | ||
418 | err = -EINVAL; | |
419 | if (isk->inet_num != 0) | |
420 | goto out; | |
421 | ||
422 | err = -EADDRINUSE; | |
6d0bfe22 LC |
423 | ping_set_saddr(sk, uaddr); |
424 | snum = ntohs(((struct sockaddr_in *)uaddr)->sin_port); | |
425 | if (ping_get_port(sk, snum) != 0) { | |
426 | ping_clear_saddr(sk, dif); | |
c319b4d7 VK |
427 | goto out; |
428 | } | |
429 | ||
a7ef6715 GF |
430 | pr_debug("after bind(): num = %hu, dif = %d\n", |
431 | isk->inet_num, | |
432 | sk->sk_bound_dev_if); | |
c319b4d7 VK |
433 | |
434 | err = 0; | |
c2bb06db | 435 | if (sk->sk_family == AF_INET && isk->inet_rcv_saddr) |
c319b4d7 | 436 | sk->sk_userlocks |= SOCK_BINDADDR_LOCK; |
c2bb06db ED |
437 | #if IS_ENABLED(CONFIG_IPV6) |
438 | if (sk->sk_family == AF_INET6 && !ipv6_addr_any(&sk->sk_v6_rcv_saddr)) | |
439 | sk->sk_userlocks |= SOCK_BINDADDR_LOCK; | |
440 | #endif | |
6d0bfe22 | 441 | |
c319b4d7 VK |
442 | if (snum) |
443 | sk->sk_userlocks |= SOCK_BINDPORT_LOCK; | |
444 | isk->inet_sport = htons(isk->inet_num); | |
445 | isk->inet_daddr = 0; | |
446 | isk->inet_dport = 0; | |
6d0bfe22 LC |
447 | |
448 | #if IS_ENABLED(CONFIG_IPV6) | |
449 | if (sk->sk_family == AF_INET6) | |
efe4208f | 450 | memset(&sk->sk_v6_daddr, 0, sizeof(sk->sk_v6_daddr)); |
6d0bfe22 LC |
451 | #endif |
452 | ||
c319b4d7 VK |
453 | sk_dst_reset(sk); |
454 | out: | |
455 | release_sock(sk); | |
456 | pr_debug("ping_v4_bind -> %d\n", err); | |
457 | return err; | |
458 | } | |
6d0bfe22 | 459 | EXPORT_SYMBOL_GPL(ping_bind); |
c319b4d7 VK |
460 | |
461 | /* | |
462 | * Is this a supported type of ICMP message? | |
463 | */ | |
464 | ||
6d0bfe22 | 465 | static inline int ping_supported(int family, int type, int code) |
c319b4d7 | 466 | { |
6d0bfe22 LC |
467 | return (family == AF_INET && type == ICMP_ECHO && code == 0) || |
468 | (family == AF_INET6 && type == ICMPV6_ECHO_REQUEST && code == 0); | |
c319b4d7 VK |
469 | } |
470 | ||
471 | /* | |
472 | * This routine is called by the ICMP module when it gets some | |
473 | * sort of error condition. | |
474 | */ | |
475 | ||
6d0bfe22 | 476 | void ping_err(struct sk_buff *skb, int offset, u32 info) |
c319b4d7 | 477 | { |
6d0bfe22 LC |
478 | int family; |
479 | struct icmphdr *icmph; | |
c319b4d7 | 480 | struct inet_sock *inet_sock; |
6d0bfe22 LC |
481 | int type; |
482 | int code; | |
c319b4d7 VK |
483 | struct net *net = dev_net(skb->dev); |
484 | struct sock *sk; | |
485 | int harderr; | |
486 | int err; | |
487 | ||
6d0bfe22 LC |
488 | if (skb->protocol == htons(ETH_P_IP)) { |
489 | family = AF_INET; | |
490 | type = icmp_hdr(skb)->type; | |
491 | code = icmp_hdr(skb)->code; | |
492 | icmph = (struct icmphdr *)(skb->data + offset); | |
493 | } else if (skb->protocol == htons(ETH_P_IPV6)) { | |
494 | family = AF_INET6; | |
495 | type = icmp6_hdr(skb)->icmp6_type; | |
496 | code = icmp6_hdr(skb)->icmp6_code; | |
497 | icmph = (struct icmphdr *) (skb->data + offset); | |
498 | } else { | |
499 | BUG(); | |
500 | } | |
501 | ||
c319b4d7 VK |
502 | /* We assume the packet has already been checked by icmp_unreach */ |
503 | ||
6d0bfe22 | 504 | if (!ping_supported(family, icmph->type, icmph->code)) |
c319b4d7 VK |
505 | return; |
506 | ||
6d0bfe22 LC |
507 | pr_debug("ping_err(proto=0x%x,type=%d,code=%d,id=%04x,seq=%04x)\n", |
508 | skb->protocol, type, code, ntohs(icmph->un.echo.id), | |
509 | ntohs(icmph->un.echo.sequence)); | |
c319b4d7 | 510 | |
6d0bfe22 | 511 | sk = ping_lookup(net, skb, ntohs(icmph->un.echo.id)); |
51456b29 | 512 | if (!sk) { |
c319b4d7 VK |
513 | pr_debug("no socket, dropping\n"); |
514 | return; /* No socket for error */ | |
515 | } | |
516 | pr_debug("err on socket %p\n", sk); | |
517 | ||
518 | err = 0; | |
519 | harderr = 0; | |
520 | inet_sock = inet_sk(sk); | |
521 | ||
6d0bfe22 LC |
522 | if (skb->protocol == htons(ETH_P_IP)) { |
523 | switch (type) { | |
524 | default: | |
525 | case ICMP_TIME_EXCEEDED: | |
526 | err = EHOSTUNREACH; | |
527 | break; | |
528 | case ICMP_SOURCE_QUENCH: | |
529 | /* This is not a real error but ping wants to see it. | |
530 | * Report it with some fake errno. | |
531 | */ | |
532 | err = EREMOTEIO; | |
533 | break; | |
534 | case ICMP_PARAMETERPROB: | |
535 | err = EPROTO; | |
536 | harderr = 1; | |
537 | break; | |
538 | case ICMP_DEST_UNREACH: | |
539 | if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */ | |
540 | ipv4_sk_update_pmtu(skb, sk, info); | |
541 | if (inet_sock->pmtudisc != IP_PMTUDISC_DONT) { | |
542 | err = EMSGSIZE; | |
543 | harderr = 1; | |
544 | break; | |
545 | } | |
546 | goto out; | |
c319b4d7 | 547 | } |
6d0bfe22 LC |
548 | err = EHOSTUNREACH; |
549 | if (code <= NR_ICMP_UNREACH) { | |
550 | harderr = icmp_err_convert[code].fatal; | |
551 | err = icmp_err_convert[code].errno; | |
552 | } | |
553 | break; | |
554 | case ICMP_REDIRECT: | |
555 | /* See ICMP_SOURCE_QUENCH */ | |
556 | ipv4_sk_redirect(skb, sk); | |
557 | err = EREMOTEIO; | |
558 | break; | |
c319b4d7 | 559 | } |
6d0bfe22 LC |
560 | #if IS_ENABLED(CONFIG_IPV6) |
561 | } else if (skb->protocol == htons(ETH_P_IPV6)) { | |
562 | harderr = pingv6_ops.icmpv6_err_convert(type, code, &err); | |
563 | #endif | |
c319b4d7 VK |
564 | } |
565 | ||
566 | /* | |
567 | * RFC1122: OK. Passes ICMP errors back to application, as per | |
568 | * 4.1.3.3. | |
569 | */ | |
6d0bfe22 LC |
570 | if ((family == AF_INET && !inet_sock->recverr) || |
571 | (family == AF_INET6 && !inet6_sk(sk)->recverr)) { | |
c319b4d7 VK |
572 | if (!harderr || sk->sk_state != TCP_ESTABLISHED) |
573 | goto out; | |
574 | } else { | |
6d0bfe22 LC |
575 | if (family == AF_INET) { |
576 | ip_icmp_error(sk, skb, err, 0 /* no remote port */, | |
577 | info, (u8 *)icmph); | |
578 | #if IS_ENABLED(CONFIG_IPV6) | |
579 | } else if (family == AF_INET6) { | |
580 | pingv6_ops.ipv6_icmp_error(sk, skb, err, 0, | |
581 | info, (u8 *)icmph); | |
582 | #endif | |
583 | } | |
c319b4d7 VK |
584 | } |
585 | sk->sk_err = err; | |
586 | sk->sk_error_report(sk); | |
587 | out: | |
588 | sock_put(sk); | |
589 | } | |
6d0bfe22 | 590 | EXPORT_SYMBOL_GPL(ping_err); |
c319b4d7 VK |
591 | |
592 | /* | |
6d0bfe22 LC |
593 | * Copy and checksum an ICMP Echo packet from user space into a buffer |
594 | * starting from the payload. | |
c319b4d7 VK |
595 | */ |
596 | ||
6d0bfe22 LC |
597 | int ping_getfrag(void *from, char *to, |
598 | int offset, int fraglen, int odd, struct sk_buff *skb) | |
c319b4d7 VK |
599 | { |
600 | struct pingfakehdr *pfh = (struct pingfakehdr *)from; | |
601 | ||
602 | if (offset == 0) { | |
21226abb AV |
603 | fraglen -= sizeof(struct icmphdr); |
604 | if (fraglen < 0) | |
c319b4d7 | 605 | BUG(); |
0b62fca2 | 606 | if (!csum_and_copy_from_iter_full(to + sizeof(struct icmphdr), |
21226abb | 607 | fraglen, &pfh->wcheck, |
0b62fca2 | 608 | &pfh->msg->msg_iter)) |
c319b4d7 | 609 | return -EFAULT; |
6d0bfe22 LC |
610 | } else if (offset < sizeof(struct icmphdr)) { |
611 | BUG(); | |
612 | } else { | |
0b62fca2 AV |
613 | if (!csum_and_copy_from_iter_full(to, fraglen, &pfh->wcheck, |
614 | &pfh->msg->msg_iter)) | |
6d0bfe22 LC |
615 | return -EFAULT; |
616 | } | |
c319b4d7 | 617 | |
6d0bfe22 LC |
618 | #if IS_ENABLED(CONFIG_IPV6) |
619 | /* For IPv6, checksum each skb as we go along, as expected by | |
620 | * icmpv6_push_pending_frames. For IPv4, accumulate the checksum in | |
621 | * wcheck, it will be finalized in ping_v4_push_pending_frames. | |
622 | */ | |
623 | if (pfh->family == AF_INET6) { | |
624 | skb->csum = pfh->wcheck; | |
625 | skb->ip_summed = CHECKSUM_NONE; | |
626 | pfh->wcheck = 0; | |
c319b4d7 | 627 | } |
6d0bfe22 LC |
628 | #endif |
629 | ||
c319b4d7 VK |
630 | return 0; |
631 | } | |
6d0bfe22 | 632 | EXPORT_SYMBOL_GPL(ping_getfrag); |
c319b4d7 | 633 | |
6d0bfe22 LC |
634 | static int ping_v4_push_pending_frames(struct sock *sk, struct pingfakehdr *pfh, |
635 | struct flowi4 *fl4) | |
c319b4d7 VK |
636 | { |
637 | struct sk_buff *skb = skb_peek(&sk->sk_write_queue); | |
638 | ||
73d2c667 WC |
639 | if (!skb) |
640 | return 0; | |
c319b4d7 VK |
641 | pfh->wcheck = csum_partial((char *)&pfh->icmph, |
642 | sizeof(struct icmphdr), pfh->wcheck); | |
643 | pfh->icmph.checksum = csum_fold(pfh->wcheck); | |
644 | memcpy(icmp_hdr(skb), &pfh->icmph, sizeof(struct icmphdr)); | |
645 | skb->ip_summed = CHECKSUM_NONE; | |
646 | return ip_push_pending_frames(sk, fl4); | |
647 | } | |
648 | ||
6d0bfe22 LC |
649 | int ping_common_sendmsg(int family, struct msghdr *msg, size_t len, |
650 | void *user_icmph, size_t icmph_len) { | |
651 | u8 type, code; | |
c319b4d7 VK |
652 | |
653 | if (len > 0xFFFF) | |
654 | return -EMSGSIZE; | |
655 | ||
0eab121e KC |
656 | /* Must have at least a full ICMP header. */ |
657 | if (len < icmph_len) | |
658 | return -EINVAL; | |
659 | ||
c319b4d7 VK |
660 | /* |
661 | * Check the flags. | |
662 | */ | |
663 | ||
664 | /* Mirror BSD error message compatibility */ | |
665 | if (msg->msg_flags & MSG_OOB) | |
666 | return -EOPNOTSUPP; | |
667 | ||
668 | /* | |
669 | * Fetch the ICMP header provided by the userland. | |
6d0bfe22 | 670 | * iovec is modified! The ICMP header is consumed. |
c319b4d7 | 671 | */ |
6ce8e9ce | 672 | if (memcpy_from_msg(user_icmph, msg, icmph_len)) |
c319b4d7 | 673 | return -EFAULT; |
6d0bfe22 LC |
674 | |
675 | if (family == AF_INET) { | |
676 | type = ((struct icmphdr *) user_icmph)->type; | |
677 | code = ((struct icmphdr *) user_icmph)->code; | |
678 | #if IS_ENABLED(CONFIG_IPV6) | |
679 | } else if (family == AF_INET6) { | |
680 | type = ((struct icmp6hdr *) user_icmph)->icmp6_type; | |
681 | code = ((struct icmp6hdr *) user_icmph)->icmp6_code; | |
682 | #endif | |
683 | } else { | |
684 | BUG(); | |
685 | } | |
686 | ||
687 | if (!ping_supported(family, type, code)) | |
c319b4d7 VK |
688 | return -EINVAL; |
689 | ||
6d0bfe22 LC |
690 | return 0; |
691 | } | |
692 | EXPORT_SYMBOL_GPL(ping_common_sendmsg); | |
693 | ||
1b784140 | 694 | static int ping_v4_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) |
6d0bfe22 LC |
695 | { |
696 | struct net *net = sock_net(sk); | |
697 | struct flowi4 fl4; | |
698 | struct inet_sock *inet = inet_sk(sk); | |
699 | struct ipcm_cookie ipc; | |
700 | struct icmphdr user_icmph; | |
701 | struct pingfakehdr pfh; | |
702 | struct rtable *rt = NULL; | |
703 | struct ip_options_data opt_copy; | |
704 | int free = 0; | |
705 | __be32 saddr, daddr, faddr; | |
706 | u8 tos; | |
707 | int err; | |
708 | ||
709 | pr_debug("ping_v4_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num); | |
710 | ||
711 | err = ping_common_sendmsg(AF_INET, msg, len, &user_icmph, | |
712 | sizeof(user_icmph)); | |
713 | if (err) | |
714 | return err; | |
715 | ||
c319b4d7 VK |
716 | /* |
717 | * Get and verify the address. | |
718 | */ | |
719 | ||
720 | if (msg->msg_name) { | |
342dfc30 | 721 | DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name); |
c319b4d7 VK |
722 | if (msg->msg_namelen < sizeof(*usin)) |
723 | return -EINVAL; | |
724 | if (usin->sin_family != AF_INET) | |
9145736d | 725 | return -EAFNOSUPPORT; |
c319b4d7 VK |
726 | daddr = usin->sin_addr.s_addr; |
727 | /* no remote port */ | |
728 | } else { | |
729 | if (sk->sk_state != TCP_ESTABLISHED) | |
730 | return -EDESTADDRREQ; | |
731 | daddr = inet->inet_daddr; | |
732 | /* no remote port */ | |
733 | } | |
734 | ||
35178206 | 735 | ipcm_init_sk(&ipc, inet); |
bf84a010 | 736 | |
c319b4d7 | 737 | if (msg->msg_controllen) { |
24025c46 | 738 | err = ip_cmsg_send(sk, msg, &ipc, false); |
91948309 ED |
739 | if (unlikely(err)) { |
740 | kfree(ipc.opt); | |
c319b4d7 | 741 | return err; |
91948309 | 742 | } |
c319b4d7 VK |
743 | if (ipc.opt) |
744 | free = 1; | |
745 | } | |
746 | if (!ipc.opt) { | |
747 | struct ip_options_rcu *inet_opt; | |
748 | ||
749 | rcu_read_lock(); | |
750 | inet_opt = rcu_dereference(inet->inet_opt); | |
751 | if (inet_opt) { | |
752 | memcpy(&opt_copy, inet_opt, | |
753 | sizeof(*inet_opt) + inet_opt->opt.optlen); | |
754 | ipc.opt = &opt_copy.opt; | |
755 | } | |
756 | rcu_read_unlock(); | |
757 | } | |
758 | ||
759 | saddr = ipc.addr; | |
760 | ipc.addr = faddr = daddr; | |
761 | ||
762 | if (ipc.opt && ipc.opt->opt.srr) { | |
1b97013b AI |
763 | if (!daddr) { |
764 | err = -EINVAL; | |
765 | goto out_free; | |
766 | } | |
c319b4d7 VK |
767 | faddr = ipc.opt->opt.faddr; |
768 | } | |
aa661581 | 769 | tos = get_rttos(&ipc, inet); |
c319b4d7 VK |
770 | if (sock_flag(sk, SOCK_LOCALROUTE) || |
771 | (msg->msg_flags & MSG_DONTROUTE) || | |
772 | (ipc.opt && ipc.opt->opt.is_strictroute)) { | |
773 | tos |= RTO_ONLINK; | |
774 | } | |
775 | ||
776 | if (ipv4_is_multicast(daddr)) { | |
854da991 | 777 | if (!ipc.oif || netif_index_is_l3_master(sock_net(sk), ipc.oif)) |
c319b4d7 VK |
778 | ipc.oif = inet->mc_index; |
779 | if (!saddr) | |
780 | saddr = inet->mc_addr; | |
76e21053 EH |
781 | } else if (!ipc.oif) |
782 | ipc.oif = inet->uc_index; | |
c319b4d7 VK |
783 | |
784 | flowi4_init_output(&fl4, ipc.oif, sk->sk_mark, tos, | |
785 | RT_SCOPE_UNIVERSE, sk->sk_protocol, | |
e2d118a1 LC |
786 | inet_sk_flowi_flags(sk), faddr, saddr, 0, 0, |
787 | sk->sk_uid); | |
c319b4d7 VK |
788 | |
789 | security_sk_classify_flow(sk, flowi4_to_flowi(&fl4)); | |
790 | rt = ip_route_output_flow(net, &fl4, sk); | |
791 | if (IS_ERR(rt)) { | |
792 | err = PTR_ERR(rt); | |
793 | rt = NULL; | |
794 | if (err == -ENETUNREACH) | |
f1d8cba6 | 795 | IP_INC_STATS(net, IPSTATS_MIB_OUTNOROUTES); |
c319b4d7 VK |
796 | goto out; |
797 | } | |
798 | ||
799 | err = -EACCES; | |
800 | if ((rt->rt_flags & RTCF_BROADCAST) && | |
801 | !sock_flag(sk, SOCK_BROADCAST)) | |
802 | goto out; | |
803 | ||
804 | if (msg->msg_flags & MSG_CONFIRM) | |
805 | goto do_confirm; | |
806 | back_from_confirm: | |
807 | ||
808 | if (!ipc.addr) | |
809 | ipc.addr = fl4.daddr; | |
810 | ||
811 | lock_sock(sk); | |
812 | ||
813 | pfh.icmph.type = user_icmph.type; /* already checked */ | |
814 | pfh.icmph.code = user_icmph.code; /* ditto */ | |
815 | pfh.icmph.checksum = 0; | |
816 | pfh.icmph.un.echo.id = inet->inet_sport; | |
817 | pfh.icmph.un.echo.sequence = user_icmph.un.echo.sequence; | |
cacdc7d2 | 818 | pfh.msg = msg; |
c319b4d7 | 819 | pfh.wcheck = 0; |
6d0bfe22 | 820 | pfh.family = AF_INET; |
c319b4d7 VK |
821 | |
822 | err = ip_append_data(sk, &fl4, ping_getfrag, &pfh, len, | |
823 | 0, &ipc, &rt, msg->msg_flags); | |
824 | if (err) | |
825 | ip_flush_pending_frames(sk); | |
826 | else | |
6d0bfe22 | 827 | err = ping_v4_push_pending_frames(sk, &pfh, &fl4); |
c319b4d7 VK |
828 | release_sock(sk); |
829 | ||
830 | out: | |
831 | ip_rt_put(rt); | |
1b97013b | 832 | out_free: |
c319b4d7 VK |
833 | if (free) |
834 | kfree(ipc.opt); | |
835 | if (!err) { | |
836 | icmp_out_count(sock_net(sk), user_icmph.type); | |
837 | return len; | |
838 | } | |
839 | return err; | |
840 | ||
841 | do_confirm: | |
0dec879f JA |
842 | if (msg->msg_flags & MSG_PROBE) |
843 | dst_confirm_neigh(&rt->dst, &fl4.daddr); | |
c319b4d7 VK |
844 | if (!(msg->msg_flags & MSG_PROBE) || len) |
845 | goto back_from_confirm; | |
846 | err = 0; | |
847 | goto out; | |
848 | } | |
849 | ||
1b784140 YX |
850 | int ping_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int noblock, |
851 | int flags, int *addr_len) | |
c319b4d7 VK |
852 | { |
853 | struct inet_sock *isk = inet_sk(sk); | |
6d0bfe22 | 854 | int family = sk->sk_family; |
c319b4d7 VK |
855 | struct sk_buff *skb; |
856 | int copied, err; | |
857 | ||
858 | pr_debug("ping_recvmsg(sk=%p,sk->num=%u)\n", isk, isk->inet_num); | |
859 | ||
a5e7424d | 860 | err = -EOPNOTSUPP; |
c319b4d7 VK |
861 | if (flags & MSG_OOB) |
862 | goto out; | |
863 | ||
f4713a3d WB |
864 | if (flags & MSG_ERRQUEUE) |
865 | return inet_recv_error(sk, msg, len, addr_len); | |
c319b4d7 VK |
866 | |
867 | skb = skb_recv_datagram(sk, flags, noblock, &err); | |
868 | if (!skb) | |
869 | goto out; | |
870 | ||
871 | copied = skb->len; | |
872 | if (copied > len) { | |
873 | msg->msg_flags |= MSG_TRUNC; | |
874 | copied = len; | |
875 | } | |
876 | ||
877 | /* Don't bother checking the checksum */ | |
51f3d02b | 878 | err = skb_copy_datagram_msg(skb, 0, msg, copied); |
c319b4d7 VK |
879 | if (err) |
880 | goto done; | |
881 | ||
882 | sock_recv_timestamp(msg, sk, skb); | |
883 | ||
6d0bfe22 LC |
884 | /* Copy the address and add cmsg data. */ |
885 | if (family == AF_INET) { | |
342dfc30 | 886 | DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); |
bceaa902 | 887 | |
cf970c00 HFS |
888 | if (sin) { |
889 | sin->sin_family = AF_INET; | |
890 | sin->sin_port = 0 /* skb->h.uh->source */; | |
891 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; | |
892 | memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
893 | *addr_len = sizeof(*sin); | |
894 | } | |
6d0bfe22 LC |
895 | |
896 | if (isk->cmsg_flags) | |
897 | ip_cmsg_recv(msg, skb); | |
898 | ||
899 | #if IS_ENABLED(CONFIG_IPV6) | |
900 | } else if (family == AF_INET6) { | |
901 | struct ipv6_pinfo *np = inet6_sk(sk); | |
902 | struct ipv6hdr *ip6 = ipv6_hdr(skb); | |
342dfc30 | 903 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); |
bceaa902 | 904 | |
cf970c00 HFS |
905 | if (sin6) { |
906 | sin6->sin6_family = AF_INET6; | |
907 | sin6->sin6_port = 0; | |
908 | sin6->sin6_addr = ip6->saddr; | |
909 | sin6->sin6_flowinfo = 0; | |
910 | if (np->sndflow) | |
911 | sin6->sin6_flowinfo = ip6_flowinfo(ip6); | |
912 | sin6->sin6_scope_id = | |
913 | ipv6_iface_scope_id(&sin6->sin6_addr, | |
4330487a | 914 | inet6_iif(skb)); |
cf970c00 HFS |
915 | *addr_len = sizeof(*sin6); |
916 | } | |
6d0bfe22 LC |
917 | |
918 | if (inet6_sk(sk)->rxopt.all) | |
4b261c75 HFS |
919 | pingv6_ops.ip6_datagram_recv_common_ctl(sk, msg, skb); |
920 | if (skb->protocol == htons(ETH_P_IPV6) && | |
921 | inet6_sk(sk)->rxopt.all) | |
922 | pingv6_ops.ip6_datagram_recv_specific_ctl(sk, msg, skb); | |
923 | else if (skb->protocol == htons(ETH_P_IP) && isk->cmsg_flags) | |
924 | ip_cmsg_recv(msg, skb); | |
6d0bfe22 LC |
925 | #endif |
926 | } else { | |
927 | BUG(); | |
c319b4d7 | 928 | } |
6d0bfe22 | 929 | |
c319b4d7 VK |
930 | err = copied; |
931 | ||
932 | done: | |
933 | skb_free_datagram(sk, skb); | |
934 | out: | |
935 | pr_debug("ping_recvmsg -> %d\n", err); | |
936 | return err; | |
937 | } | |
6d0bfe22 | 938 | EXPORT_SYMBOL_GPL(ping_recvmsg); |
c319b4d7 | 939 | |
6d0bfe22 | 940 | int ping_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
c319b4d7 VK |
941 | { |
942 | pr_debug("ping_queue_rcv_skb(sk=%p,sk->num=%d,skb=%p)\n", | |
058bd4d2 | 943 | inet_sk(sk), inet_sk(sk)->inet_num, skb); |
c319b4d7 | 944 | if (sock_queue_rcv_skb(sk, skb) < 0) { |
c319b4d7 VK |
945 | kfree_skb(skb); |
946 | pr_debug("ping_queue_rcv_skb -> failed\n"); | |
947 | return -1; | |
948 | } | |
949 | return 0; | |
950 | } | |
6d0bfe22 | 951 | EXPORT_SYMBOL_GPL(ping_queue_rcv_skb); |
c319b4d7 VK |
952 | |
953 | ||
954 | /* | |
955 | * All we need to do is get the socket. | |
956 | */ | |
957 | ||
e3e32170 | 958 | bool ping_rcv(struct sk_buff *skb) |
c319b4d7 VK |
959 | { |
960 | struct sock *sk; | |
961 | struct net *net = dev_net(skb->dev); | |
c319b4d7 | 962 | struct icmphdr *icmph = icmp_hdr(skb); |
c319b4d7 VK |
963 | |
964 | /* We assume the packet has already been checked by icmp_rcv */ | |
965 | ||
966 | pr_debug("ping_rcv(skb=%p,id=%04x,seq=%04x)\n", | |
058bd4d2 | 967 | skb, ntohs(icmph->un.echo.id), ntohs(icmph->un.echo.sequence)); |
c319b4d7 VK |
968 | |
969 | /* Push ICMP header back */ | |
970 | skb_push(skb, skb->data - (u8 *)icmph); | |
971 | ||
6d0bfe22 | 972 | sk = ping_lookup(net, skb, ntohs(icmph->un.echo.id)); |
00db4124 | 973 | if (sk) { |
fc752f1f SAK |
974 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); |
975 | ||
c319b4d7 | 976 | pr_debug("rcv on socket %p\n", sk); |
fc752f1f SAK |
977 | if (skb2) |
978 | ping_queue_rcv_skb(sk, skb2); | |
c319b4d7 | 979 | sock_put(sk); |
e3e32170 | 980 | return true; |
c319b4d7 VK |
981 | } |
982 | pr_debug("no socket, dropping\n"); | |
983 | ||
e3e32170 | 984 | return false; |
c319b4d7 | 985 | } |
6d0bfe22 | 986 | EXPORT_SYMBOL_GPL(ping_rcv); |
c319b4d7 VK |
987 | |
988 | struct proto ping_prot = { | |
989 | .name = "PING", | |
990 | .owner = THIS_MODULE, | |
991 | .init = ping_init_sock, | |
992 | .close = ping_close, | |
993 | .connect = ip4_datagram_connect, | |
286c72de | 994 | .disconnect = __udp_disconnect, |
c319b4d7 VK |
995 | .setsockopt = ip_setsockopt, |
996 | .getsockopt = ip_getsockopt, | |
6d0bfe22 | 997 | .sendmsg = ping_v4_sendmsg, |
c319b4d7 VK |
998 | .recvmsg = ping_recvmsg, |
999 | .bind = ping_bind, | |
1000 | .backlog_rcv = ping_queue_rcv_skb, | |
8141ed9f | 1001 | .release_cb = ip4_datagram_release_cb, |
6d0bfe22 LC |
1002 | .hash = ping_hash, |
1003 | .unhash = ping_unhash, | |
1004 | .get_port = ping_get_port, | |
c319b4d7 VK |
1005 | .obj_size = sizeof(struct inet_sock), |
1006 | }; | |
1007 | EXPORT_SYMBOL(ping_prot); | |
1008 | ||
1009 | #ifdef CONFIG_PROC_FS | |
1010 | ||
1011 | static struct sock *ping_get_first(struct seq_file *seq, int start) | |
1012 | { | |
1013 | struct sock *sk; | |
1014 | struct ping_iter_state *state = seq->private; | |
1015 | struct net *net = seq_file_net(seq); | |
1016 | ||
1017 | for (state->bucket = start; state->bucket < PING_HTABLE_SIZE; | |
1018 | ++state->bucket) { | |
1019 | struct hlist_nulls_node *node; | |
75e308c8 CG |
1020 | struct hlist_nulls_head *hslot; |
1021 | ||
1022 | hslot = &ping_table.hash[state->bucket]; | |
c319b4d7 VK |
1023 | |
1024 | if (hlist_nulls_empty(hslot)) | |
1025 | continue; | |
1026 | ||
1027 | sk_nulls_for_each(sk, node, hslot) { | |
8cc785f6 LC |
1028 | if (net_eq(sock_net(sk), net) && |
1029 | sk->sk_family == state->family) | |
c319b4d7 VK |
1030 | goto found; |
1031 | } | |
1032 | } | |
1033 | sk = NULL; | |
1034 | found: | |
1035 | return sk; | |
1036 | } | |
1037 | ||
1038 | static struct sock *ping_get_next(struct seq_file *seq, struct sock *sk) | |
1039 | { | |
1040 | struct ping_iter_state *state = seq->private; | |
1041 | struct net *net = seq_file_net(seq); | |
1042 | ||
1043 | do { | |
1044 | sk = sk_nulls_next(sk); | |
1045 | } while (sk && (!net_eq(sock_net(sk), net))); | |
1046 | ||
1047 | if (!sk) | |
1048 | return ping_get_first(seq, state->bucket + 1); | |
1049 | return sk; | |
1050 | } | |
1051 | ||
1052 | static struct sock *ping_get_idx(struct seq_file *seq, loff_t pos) | |
1053 | { | |
1054 | struct sock *sk = ping_get_first(seq, 0); | |
1055 | ||
1056 | if (sk) | |
1057 | while (pos && (sk = ping_get_next(seq, sk)) != NULL) | |
1058 | --pos; | |
1059 | return pos ? NULL : sk; | |
1060 | } | |
1061 | ||
d862e546 | 1062 | void *ping_seq_start(struct seq_file *seq, loff_t *pos, sa_family_t family) |
ad64b8be | 1063 | __acquires(ping_table.lock) |
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) |
ad64b8be | 1095 | __releases(ping_table.lock) |
c319b4d7 VK |
1096 | { |
1097 | read_unlock_bh(&ping_table.lock); | |
1098 | } | |
d862e546 | 1099 | EXPORT_SYMBOL_GPL(ping_seq_stop); |
c319b4d7 | 1100 | |
8cc785f6 | 1101 | static void ping_v4_format_sock(struct sock *sp, struct seq_file *f, |
652586df | 1102 | int bucket) |
c319b4d7 VK |
1103 | { |
1104 | struct inet_sock *inet = inet_sk(sp); | |
1105 | __be32 dest = inet->inet_daddr; | |
1106 | __be32 src = inet->inet_rcv_saddr; | |
1107 | __u16 destp = ntohs(inet->inet_dport); | |
1108 | __u16 srcp = ntohs(inet->inet_sport); | |
1109 | ||
1110 | seq_printf(f, "%5d: %08X:%04X %08X:%04X" | |
ea9a0379 | 1111 | " %02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %u", |
c319b4d7 VK |
1112 | bucket, src, srcp, dest, destp, sp->sk_state, |
1113 | sk_wmem_alloc_get(sp), | |
1114 | sk_rmem_alloc_get(sp), | |
a7cb5a49 EB |
1115 | 0, 0L, 0, |
1116 | from_kuid_munged(seq_user_ns(f), sock_i_uid(sp)), | |
1117 | 0, sock_i_ino(sp), | |
41c6d650 | 1118 | refcount_read(&sp->sk_refcnt), sp, |
652586df | 1119 | atomic_read(&sp->sk_drops)); |
c319b4d7 VK |
1120 | } |
1121 | ||
8cc785f6 | 1122 | static int ping_v4_seq_show(struct seq_file *seq, void *v) |
c319b4d7 | 1123 | { |
652586df | 1124 | seq_setwidth(seq, 127); |
c319b4d7 | 1125 | if (v == SEQ_START_TOKEN) |
652586df | 1126 | seq_puts(seq, " sl local_address rem_address st tx_queue " |
c319b4d7 VK |
1127 | "rx_queue tr tm->when retrnsmt uid timeout " |
1128 | "inode ref pointer drops"); | |
1129 | else { | |
1130 | struct ping_iter_state *state = seq->private; | |
c319b4d7 | 1131 | |
652586df | 1132 | ping_v4_format_sock(v, seq, state->bucket); |
c319b4d7 | 1133 | } |
652586df | 1134 | seq_pad(seq, '\n'); |
c319b4d7 VK |
1135 | return 0; |
1136 | } | |
1137 | ||
f4550221 CH |
1138 | static const struct seq_operations ping_v4_seq_ops = { |
1139 | .start = ping_v4_seq_start, | |
1140 | .show = ping_v4_seq_show, | |
1141 | .next = ping_seq_next, | |
1142 | .stop = ping_seq_stop, | |
1143 | }; | |
1144 | ||
f4550221 | 1145 | static int __net_init ping_v4_proc_init_net(struct net *net) |
c319b4d7 | 1146 | { |
c3506372 CH |
1147 | if (!proc_create_net("icmp", 0444, net->proc_net, &ping_v4_seq_ops, |
1148 | sizeof(struct ping_iter_state))) | |
8cc785f6 LC |
1149 | return -ENOMEM; |
1150 | return 0; | |
c319b4d7 | 1151 | } |
c319b4d7 | 1152 | |
8cc785f6 | 1153 | static void __net_exit ping_v4_proc_exit_net(struct net *net) |
c319b4d7 | 1154 | { |
f4550221 | 1155 | remove_proc_entry("icmp", net->proc_net); |
c319b4d7 VK |
1156 | } |
1157 | ||
8cc785f6 LC |
1158 | static struct pernet_operations ping_v4_net_ops = { |
1159 | .init = ping_v4_proc_init_net, | |
1160 | .exit = ping_v4_proc_exit_net, | |
c319b4d7 VK |
1161 | }; |
1162 | ||
1163 | int __init ping_proc_init(void) | |
1164 | { | |
8cc785f6 | 1165 | return register_pernet_subsys(&ping_v4_net_ops); |
c319b4d7 VK |
1166 | } |
1167 | ||
1168 | void ping_proc_exit(void) | |
1169 | { | |
8cc785f6 | 1170 | unregister_pernet_subsys(&ping_v4_net_ops); |
c319b4d7 VK |
1171 | } |
1172 | ||
1173 | #endif | |
1174 | ||
1175 | void __init ping_init(void) | |
1176 | { | |
1177 | int i; | |
1178 | ||
1179 | for (i = 0; i < PING_HTABLE_SIZE; i++) | |
1180 | INIT_HLIST_NULLS_HEAD(&ping_table.hash[i], i); | |
1181 | rwlock_init(&ping_table.lock); | |
1182 | } |