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> | |
36 | #include <net/ipv6.h> | |
37 | #include <net/icmp.h> | |
38 | #include <net/protocol.h> | |
39 | #include <linux/skbuff.h> | |
40 | #include <linux/proc_fs.h> | |
bc3b2d7f | 41 | #include <linux/export.h> |
c319b4d7 VK |
42 | #include <net/sock.h> |
43 | #include <net/ping.h> | |
c319b4d7 VK |
44 | #include <net/udp.h> |
45 | #include <net/route.h> | |
46 | #include <net/inet_common.h> | |
47 | #include <net/checksum.h> | |
48 | ||
49 | ||
1b1cb1f7 | 50 | static struct ping_table ping_table; |
c319b4d7 | 51 | |
1b1cb1f7 | 52 | static u16 ping_port_rover; |
c319b4d7 | 53 | |
95c96174 | 54 | static inline int ping_hashfn(struct net *net, unsigned int num, unsigned int mask) |
c319b4d7 VK |
55 | { |
56 | int res = (num + net_hash_mix(net)) & mask; | |
95c96174 | 57 | |
c319b4d7 VK |
58 | pr_debug("hash(%d) = %d\n", num, res); |
59 | return res; | |
60 | } | |
61 | ||
62 | static inline struct hlist_nulls_head *ping_hashslot(struct ping_table *table, | |
95c96174 | 63 | struct net *net, unsigned int num) |
c319b4d7 VK |
64 | { |
65 | return &table->hash[ping_hashfn(net, num, PING_HTABLE_MASK)]; | |
66 | } | |
67 | ||
68 | static int ping_v4_get_port(struct sock *sk, unsigned short ident) | |
69 | { | |
70 | struct hlist_nulls_node *node; | |
71 | struct hlist_nulls_head *hlist; | |
72 | struct inet_sock *isk, *isk2; | |
73 | struct sock *sk2 = NULL; | |
74 | ||
75 | isk = inet_sk(sk); | |
76 | write_lock_bh(&ping_table.lock); | |
77 | if (ident == 0) { | |
78 | u32 i; | |
79 | u16 result = ping_port_rover + 1; | |
80 | ||
81 | for (i = 0; i < (1L << 16); i++, result++) { | |
82 | if (!result) | |
83 | result++; /* avoid zero */ | |
84 | hlist = ping_hashslot(&ping_table, sock_net(sk), | |
85 | result); | |
86 | ping_portaddr_for_each_entry(sk2, node, hlist) { | |
87 | isk2 = inet_sk(sk2); | |
88 | ||
89 | if (isk2->inet_num == result) | |
90 | goto next_port; | |
91 | } | |
92 | ||
93 | /* found */ | |
94 | ping_port_rover = ident = result; | |
95 | break; | |
96 | next_port: | |
97 | ; | |
98 | } | |
99 | if (i >= (1L << 16)) | |
100 | goto fail; | |
101 | } else { | |
102 | hlist = ping_hashslot(&ping_table, sock_net(sk), ident); | |
103 | ping_portaddr_for_each_entry(sk2, node, hlist) { | |
104 | isk2 = inet_sk(sk2); | |
105 | ||
106 | if ((isk2->inet_num == ident) && | |
107 | (sk2 != sk) && | |
108 | (!sk2->sk_reuse || !sk->sk_reuse)) | |
109 | goto fail; | |
110 | } | |
111 | } | |
112 | ||
113 | pr_debug("found port/ident = %d\n", ident); | |
114 | isk->inet_num = ident; | |
115 | if (sk_unhashed(sk)) { | |
116 | pr_debug("was not hashed\n"); | |
117 | sock_hold(sk); | |
118 | hlist_nulls_add_head(&sk->sk_nulls_node, hlist); | |
119 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); | |
120 | } | |
121 | write_unlock_bh(&ping_table.lock); | |
122 | return 0; | |
123 | ||
124 | fail: | |
125 | write_unlock_bh(&ping_table.lock); | |
126 | return 1; | |
127 | } | |
128 | ||
129 | static void ping_v4_hash(struct sock *sk) | |
130 | { | |
131 | pr_debug("ping_v4_hash(sk->port=%u)\n", inet_sk(sk)->inet_num); | |
132 | BUG(); /* "Please do not press this button again." */ | |
133 | } | |
134 | ||
135 | static void ping_v4_unhash(struct sock *sk) | |
136 | { | |
137 | struct inet_sock *isk = inet_sk(sk); | |
138 | pr_debug("ping_v4_unhash(isk=%p,isk->num=%u)\n", isk, isk->inet_num); | |
139 | if (sk_hashed(sk)) { | |
c319b4d7 VK |
140 | write_lock_bh(&ping_table.lock); |
141 | hlist_nulls_del(&sk->sk_nulls_node); | |
142 | sock_put(sk); | |
747465ef ED |
143 | isk->inet_num = 0; |
144 | isk->inet_sport = 0; | |
c319b4d7 VK |
145 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); |
146 | write_unlock_bh(&ping_table.lock); | |
147 | } | |
148 | } | |
149 | ||
747465ef | 150 | static struct sock *ping_v4_lookup(struct net *net, __be32 saddr, __be32 daddr, |
1b1cb1f7 | 151 | u16 ident, int dif) |
c319b4d7 VK |
152 | { |
153 | struct hlist_nulls_head *hslot = ping_hashslot(&ping_table, net, ident); | |
154 | struct sock *sk = NULL; | |
155 | struct inet_sock *isk; | |
156 | struct hlist_nulls_node *hnode; | |
157 | ||
747465ef | 158 | pr_debug("try to find: num = %d, daddr = %pI4, dif = %d\n", |
058bd4d2 | 159 | (int)ident, &daddr, dif); |
c319b4d7 VK |
160 | read_lock_bh(&ping_table.lock); |
161 | ||
162 | ping_portaddr_for_each_entry(sk, hnode, hslot) { | |
163 | isk = inet_sk(sk); | |
164 | ||
747465ef ED |
165 | pr_debug("found: %p: num = %d, daddr = %pI4, dif = %d\n", sk, |
166 | (int)isk->inet_num, &isk->inet_rcv_saddr, | |
c319b4d7 VK |
167 | sk->sk_bound_dev_if); |
168 | ||
169 | pr_debug("iterate\n"); | |
170 | if (isk->inet_num != ident) | |
171 | continue; | |
172 | if (isk->inet_rcv_saddr && isk->inet_rcv_saddr != daddr) | |
173 | continue; | |
174 | if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) | |
175 | continue; | |
176 | ||
177 | sock_hold(sk); | |
178 | goto exit; | |
179 | } | |
180 | ||
181 | sk = NULL; | |
182 | exit: | |
183 | read_unlock_bh(&ping_table.lock); | |
184 | ||
185 | return sk; | |
186 | } | |
187 | ||
7064d16e EB |
188 | static void inet_get_ping_group_range_net(struct net *net, kgid_t *low, |
189 | kgid_t *high) | |
f56e03e8 | 190 | { |
7064d16e | 191 | kgid_t *data = net->ipv4.sysctl_ping_group_range; |
95c96174 ED |
192 | unsigned int seq; |
193 | ||
f56e03e8 VK |
194 | do { |
195 | seq = read_seqbegin(&sysctl_local_ports.lock); | |
196 | ||
197 | *low = data[0]; | |
198 | *high = data[1]; | |
199 | } while (read_seqretry(&sysctl_local_ports.lock, seq)); | |
200 | } | |
201 | ||
202 | ||
c319b4d7 VK |
203 | static int ping_init_sock(struct sock *sk) |
204 | { | |
205 | struct net *net = sock_net(sk); | |
7064d16e | 206 | kgid_t group = current_egid(); |
c319b4d7 VK |
207 | struct group_info *group_info = get_current_groups(); |
208 | int i, j, count = group_info->ngroups; | |
ae2975bc | 209 | kgid_t low, high; |
c319b4d7 | 210 | |
7064d16e EB |
211 | inet_get_ping_group_range_net(net, &low, &high); |
212 | if (gid_lte(low, group) && gid_lte(group, high)) | |
c319b4d7 VK |
213 | return 0; |
214 | ||
215 | for (i = 0; i < group_info->nblocks; i++) { | |
216 | int cp_count = min_t(int, NGROUPS_PER_BLOCK, count); | |
c319b4d7 | 217 | for (j = 0; j < cp_count; j++) { |
ae2975bc EB |
218 | kgid_t gid = group_info->blocks[i][j]; |
219 | if (gid_lte(low, gid) && gid_lte(gid, high)) | |
c319b4d7 VK |
220 | return 0; |
221 | } | |
222 | ||
223 | count -= cp_count; | |
224 | } | |
225 | ||
226 | return -EACCES; | |
227 | } | |
228 | ||
229 | static void ping_close(struct sock *sk, long timeout) | |
230 | { | |
231 | pr_debug("ping_close(sk=%p,sk->num=%u)\n", | |
058bd4d2 | 232 | inet_sk(sk), inet_sk(sk)->inet_num); |
c319b4d7 VK |
233 | pr_debug("isk->refcnt = %d\n", sk->sk_refcnt.counter); |
234 | ||
235 | sk_common_release(sk); | |
236 | } | |
237 | ||
238 | /* | |
239 | * We need our own bind because there are no privileged id's == local ports. | |
240 | * Moreover, we don't allow binding to multi- and broadcast addresses. | |
241 | */ | |
242 | ||
243 | static int ping_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) | |
244 | { | |
245 | struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; | |
246 | struct inet_sock *isk = inet_sk(sk); | |
247 | unsigned short snum; | |
248 | int chk_addr_ret; | |
249 | int err; | |
250 | ||
251 | if (addr_len < sizeof(struct sockaddr_in)) | |
252 | return -EINVAL; | |
253 | ||
254 | pr_debug("ping_v4_bind(sk=%p,sa_addr=%08x,sa_port=%d)\n", | |
058bd4d2 | 255 | sk, addr->sin_addr.s_addr, ntohs(addr->sin_port)); |
c319b4d7 VK |
256 | |
257 | chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr); | |
747465ef | 258 | if (addr->sin_addr.s_addr == htonl(INADDR_ANY)) |
c319b4d7 VK |
259 | chk_addr_ret = RTN_LOCAL; |
260 | ||
261 | if ((sysctl_ip_nonlocal_bind == 0 && | |
262 | isk->freebind == 0 && isk->transparent == 0 && | |
263 | chk_addr_ret != RTN_LOCAL) || | |
264 | chk_addr_ret == RTN_MULTICAST || | |
265 | chk_addr_ret == RTN_BROADCAST) | |
266 | return -EADDRNOTAVAIL; | |
267 | ||
268 | lock_sock(sk); | |
269 | ||
270 | err = -EINVAL; | |
271 | if (isk->inet_num != 0) | |
272 | goto out; | |
273 | ||
274 | err = -EADDRINUSE; | |
275 | isk->inet_rcv_saddr = isk->inet_saddr = addr->sin_addr.s_addr; | |
276 | snum = ntohs(addr->sin_port); | |
277 | if (ping_v4_get_port(sk, snum) != 0) { | |
278 | isk->inet_saddr = isk->inet_rcv_saddr = 0; | |
279 | goto out; | |
280 | } | |
281 | ||
747465ef | 282 | pr_debug("after bind(): num = %d, daddr = %pI4, dif = %d\n", |
058bd4d2 JP |
283 | (int)isk->inet_num, |
284 | &isk->inet_rcv_saddr, | |
285 | (int)sk->sk_bound_dev_if); | |
c319b4d7 VK |
286 | |
287 | err = 0; | |
288 | if (isk->inet_rcv_saddr) | |
289 | sk->sk_userlocks |= SOCK_BINDADDR_LOCK; | |
290 | if (snum) | |
291 | sk->sk_userlocks |= SOCK_BINDPORT_LOCK; | |
292 | isk->inet_sport = htons(isk->inet_num); | |
293 | isk->inet_daddr = 0; | |
294 | isk->inet_dport = 0; | |
295 | sk_dst_reset(sk); | |
296 | out: | |
297 | release_sock(sk); | |
298 | pr_debug("ping_v4_bind -> %d\n", err); | |
299 | return err; | |
300 | } | |
301 | ||
302 | /* | |
303 | * Is this a supported type of ICMP message? | |
304 | */ | |
305 | ||
306 | static inline int ping_supported(int type, int code) | |
307 | { | |
308 | if (type == ICMP_ECHO && code == 0) | |
309 | return 1; | |
310 | return 0; | |
311 | } | |
312 | ||
313 | /* | |
314 | * This routine is called by the ICMP module when it gets some | |
315 | * sort of error condition. | |
316 | */ | |
317 | ||
318 | static int ping_queue_rcv_skb(struct sock *sk, struct sk_buff *skb); | |
319 | ||
320 | void ping_err(struct sk_buff *skb, u32 info) | |
321 | { | |
322 | struct iphdr *iph = (struct iphdr *)skb->data; | |
323 | struct icmphdr *icmph = (struct icmphdr *)(skb->data+(iph->ihl<<2)); | |
324 | struct inet_sock *inet_sock; | |
325 | int type = icmph->type; | |
326 | int code = icmph->code; | |
327 | struct net *net = dev_net(skb->dev); | |
328 | struct sock *sk; | |
329 | int harderr; | |
330 | int err; | |
331 | ||
332 | /* We assume the packet has already been checked by icmp_unreach */ | |
333 | ||
334 | if (!ping_supported(icmph->type, icmph->code)) | |
335 | return; | |
336 | ||
337 | pr_debug("ping_err(type=%04x,code=%04x,id=%04x,seq=%04x)\n", type, | |
058bd4d2 | 338 | code, ntohs(icmph->un.echo.id), ntohs(icmph->un.echo.sequence)); |
c319b4d7 VK |
339 | |
340 | sk = ping_v4_lookup(net, iph->daddr, iph->saddr, | |
341 | ntohs(icmph->un.echo.id), skb->dev->ifindex); | |
342 | if (sk == NULL) { | |
c319b4d7 VK |
343 | pr_debug("no socket, dropping\n"); |
344 | return; /* No socket for error */ | |
345 | } | |
346 | pr_debug("err on socket %p\n", sk); | |
347 | ||
348 | err = 0; | |
349 | harderr = 0; | |
350 | inet_sock = inet_sk(sk); | |
351 | ||
352 | switch (type) { | |
353 | default: | |
354 | case ICMP_TIME_EXCEEDED: | |
355 | err = EHOSTUNREACH; | |
356 | break; | |
357 | case ICMP_SOURCE_QUENCH: | |
358 | /* This is not a real error but ping wants to see it. | |
359 | * Report it with some fake errno. */ | |
360 | err = EREMOTEIO; | |
361 | break; | |
362 | case ICMP_PARAMETERPROB: | |
363 | err = EPROTO; | |
364 | harderr = 1; | |
365 | break; | |
366 | case ICMP_DEST_UNREACH: | |
367 | if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */ | |
36393395 | 368 | ipv4_sk_update_pmtu(skb, sk, info); |
c319b4d7 VK |
369 | if (inet_sock->pmtudisc != IP_PMTUDISC_DONT) { |
370 | err = EMSGSIZE; | |
371 | harderr = 1; | |
372 | break; | |
373 | } | |
374 | goto out; | |
375 | } | |
376 | err = EHOSTUNREACH; | |
377 | if (code <= NR_ICMP_UNREACH) { | |
378 | harderr = icmp_err_convert[code].fatal; | |
379 | err = icmp_err_convert[code].errno; | |
380 | } | |
381 | break; | |
382 | case ICMP_REDIRECT: | |
383 | /* See ICMP_SOURCE_QUENCH */ | |
55be7a9c | 384 | ipv4_sk_redirect(skb, sk); |
c319b4d7 VK |
385 | err = EREMOTEIO; |
386 | break; | |
387 | } | |
388 | ||
389 | /* | |
390 | * RFC1122: OK. Passes ICMP errors back to application, as per | |
391 | * 4.1.3.3. | |
392 | */ | |
393 | if (!inet_sock->recverr) { | |
394 | if (!harderr || sk->sk_state != TCP_ESTABLISHED) | |
395 | goto out; | |
396 | } else { | |
397 | ip_icmp_error(sk, skb, err, 0 /* no remote port */, | |
398 | info, (u8 *)icmph); | |
399 | } | |
400 | sk->sk_err = err; | |
401 | sk->sk_error_report(sk); | |
402 | out: | |
403 | sock_put(sk); | |
404 | } | |
405 | ||
406 | /* | |
407 | * Copy and checksum an ICMP Echo packet from user space into a buffer. | |
408 | */ | |
409 | ||
410 | struct pingfakehdr { | |
411 | struct icmphdr icmph; | |
412 | struct iovec *iov; | |
747465ef | 413 | __wsum wcheck; |
c319b4d7 VK |
414 | }; |
415 | ||
5e73ea1a | 416 | static int ping_getfrag(void *from, char *to, |
c319b4d7 VK |
417 | int offset, int fraglen, int odd, struct sk_buff *skb) |
418 | { | |
419 | struct pingfakehdr *pfh = (struct pingfakehdr *)from; | |
420 | ||
421 | if (offset == 0) { | |
422 | if (fraglen < sizeof(struct icmphdr)) | |
423 | BUG(); | |
424 | if (csum_partial_copy_fromiovecend(to + sizeof(struct icmphdr), | |
425 | pfh->iov, 0, fraglen - sizeof(struct icmphdr), | |
426 | &pfh->wcheck)) | |
427 | return -EFAULT; | |
428 | ||
429 | return 0; | |
430 | } | |
431 | if (offset < sizeof(struct icmphdr)) | |
432 | BUG(); | |
433 | if (csum_partial_copy_fromiovecend | |
434 | (to, pfh->iov, offset - sizeof(struct icmphdr), | |
435 | fraglen, &pfh->wcheck)) | |
436 | return -EFAULT; | |
437 | return 0; | |
438 | } | |
439 | ||
75e308c8 CG |
440 | static int ping_push_pending_frames(struct sock *sk, struct pingfakehdr *pfh, |
441 | struct flowi4 *fl4) | |
c319b4d7 VK |
442 | { |
443 | struct sk_buff *skb = skb_peek(&sk->sk_write_queue); | |
444 | ||
445 | pfh->wcheck = csum_partial((char *)&pfh->icmph, | |
446 | sizeof(struct icmphdr), pfh->wcheck); | |
447 | pfh->icmph.checksum = csum_fold(pfh->wcheck); | |
448 | memcpy(icmp_hdr(skb), &pfh->icmph, sizeof(struct icmphdr)); | |
449 | skb->ip_summed = CHECKSUM_NONE; | |
450 | return ip_push_pending_frames(sk, fl4); | |
451 | } | |
452 | ||
bb0cd2fb CG |
453 | static int ping_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
454 | size_t len) | |
c319b4d7 VK |
455 | { |
456 | struct net *net = sock_net(sk); | |
457 | struct flowi4 fl4; | |
458 | struct inet_sock *inet = inet_sk(sk); | |
459 | struct ipcm_cookie ipc; | |
460 | struct icmphdr user_icmph; | |
461 | struct pingfakehdr pfh; | |
462 | struct rtable *rt = NULL; | |
463 | struct ip_options_data opt_copy; | |
464 | int free = 0; | |
747465ef | 465 | __be32 saddr, daddr, faddr; |
c319b4d7 VK |
466 | u8 tos; |
467 | int err; | |
468 | ||
469 | pr_debug("ping_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num); | |
470 | ||
471 | ||
472 | if (len > 0xFFFF) | |
473 | return -EMSGSIZE; | |
474 | ||
475 | /* | |
476 | * Check the flags. | |
477 | */ | |
478 | ||
479 | /* Mirror BSD error message compatibility */ | |
480 | if (msg->msg_flags & MSG_OOB) | |
481 | return -EOPNOTSUPP; | |
482 | ||
483 | /* | |
484 | * Fetch the ICMP header provided by the userland. | |
485 | * iovec is modified! | |
486 | */ | |
487 | ||
488 | if (memcpy_fromiovec((u8 *)&user_icmph, msg->msg_iov, | |
489 | sizeof(struct icmphdr))) | |
490 | return -EFAULT; | |
491 | if (!ping_supported(user_icmph.type, user_icmph.code)) | |
492 | return -EINVAL; | |
493 | ||
494 | /* | |
495 | * Get and verify the address. | |
496 | */ | |
497 | ||
498 | if (msg->msg_name) { | |
499 | struct sockaddr_in *usin = (struct sockaddr_in *)msg->msg_name; | |
500 | if (msg->msg_namelen < sizeof(*usin)) | |
501 | return -EINVAL; | |
502 | if (usin->sin_family != AF_INET) | |
503 | return -EINVAL; | |
504 | daddr = usin->sin_addr.s_addr; | |
505 | /* no remote port */ | |
506 | } else { | |
507 | if (sk->sk_state != TCP_ESTABLISHED) | |
508 | return -EDESTADDRREQ; | |
509 | daddr = inet->inet_daddr; | |
510 | /* no remote port */ | |
511 | } | |
512 | ||
513 | ipc.addr = inet->inet_saddr; | |
514 | ipc.opt = NULL; | |
515 | ipc.oif = sk->sk_bound_dev_if; | |
516 | ipc.tx_flags = 0; | |
517 | err = sock_tx_timestamp(sk, &ipc.tx_flags); | |
518 | if (err) | |
519 | return err; | |
520 | ||
521 | if (msg->msg_controllen) { | |
522 | err = ip_cmsg_send(sock_net(sk), msg, &ipc); | |
523 | if (err) | |
524 | return err; | |
525 | if (ipc.opt) | |
526 | free = 1; | |
527 | } | |
528 | if (!ipc.opt) { | |
529 | struct ip_options_rcu *inet_opt; | |
530 | ||
531 | rcu_read_lock(); | |
532 | inet_opt = rcu_dereference(inet->inet_opt); | |
533 | if (inet_opt) { | |
534 | memcpy(&opt_copy, inet_opt, | |
535 | sizeof(*inet_opt) + inet_opt->opt.optlen); | |
536 | ipc.opt = &opt_copy.opt; | |
537 | } | |
538 | rcu_read_unlock(); | |
539 | } | |
540 | ||
541 | saddr = ipc.addr; | |
542 | ipc.addr = faddr = daddr; | |
543 | ||
544 | if (ipc.opt && ipc.opt->opt.srr) { | |
545 | if (!daddr) | |
546 | return -EINVAL; | |
547 | faddr = ipc.opt->opt.faddr; | |
548 | } | |
549 | tos = RT_TOS(inet->tos); | |
550 | if (sock_flag(sk, SOCK_LOCALROUTE) || | |
551 | (msg->msg_flags & MSG_DONTROUTE) || | |
552 | (ipc.opt && ipc.opt->opt.is_strictroute)) { | |
553 | tos |= RTO_ONLINK; | |
554 | } | |
555 | ||
556 | if (ipv4_is_multicast(daddr)) { | |
557 | if (!ipc.oif) | |
558 | ipc.oif = inet->mc_index; | |
559 | if (!saddr) | |
560 | saddr = inet->mc_addr; | |
76e21053 EH |
561 | } else if (!ipc.oif) |
562 | ipc.oif = inet->uc_index; | |
c319b4d7 VK |
563 | |
564 | flowi4_init_output(&fl4, ipc.oif, sk->sk_mark, tos, | |
565 | RT_SCOPE_UNIVERSE, sk->sk_protocol, | |
566 | inet_sk_flowi_flags(sk), faddr, saddr, 0, 0); | |
567 | ||
568 | security_sk_classify_flow(sk, flowi4_to_flowi(&fl4)); | |
569 | rt = ip_route_output_flow(net, &fl4, sk); | |
570 | if (IS_ERR(rt)) { | |
571 | err = PTR_ERR(rt); | |
572 | rt = NULL; | |
573 | if (err == -ENETUNREACH) | |
574 | IP_INC_STATS_BH(net, IPSTATS_MIB_OUTNOROUTES); | |
575 | goto out; | |
576 | } | |
577 | ||
578 | err = -EACCES; | |
579 | if ((rt->rt_flags & RTCF_BROADCAST) && | |
580 | !sock_flag(sk, SOCK_BROADCAST)) | |
581 | goto out; | |
582 | ||
583 | if (msg->msg_flags & MSG_CONFIRM) | |
584 | goto do_confirm; | |
585 | back_from_confirm: | |
586 | ||
587 | if (!ipc.addr) | |
588 | ipc.addr = fl4.daddr; | |
589 | ||
590 | lock_sock(sk); | |
591 | ||
592 | pfh.icmph.type = user_icmph.type; /* already checked */ | |
593 | pfh.icmph.code = user_icmph.code; /* ditto */ | |
594 | pfh.icmph.checksum = 0; | |
595 | pfh.icmph.un.echo.id = inet->inet_sport; | |
596 | pfh.icmph.un.echo.sequence = user_icmph.un.echo.sequence; | |
597 | pfh.iov = msg->msg_iov; | |
598 | pfh.wcheck = 0; | |
599 | ||
600 | err = ip_append_data(sk, &fl4, ping_getfrag, &pfh, len, | |
601 | 0, &ipc, &rt, msg->msg_flags); | |
602 | if (err) | |
603 | ip_flush_pending_frames(sk); | |
604 | else | |
605 | err = ping_push_pending_frames(sk, &pfh, &fl4); | |
606 | release_sock(sk); | |
607 | ||
608 | out: | |
609 | ip_rt_put(rt); | |
610 | if (free) | |
611 | kfree(ipc.opt); | |
612 | if (!err) { | |
613 | icmp_out_count(sock_net(sk), user_icmph.type); | |
614 | return len; | |
615 | } | |
616 | return err; | |
617 | ||
618 | do_confirm: | |
619 | dst_confirm(&rt->dst); | |
620 | if (!(msg->msg_flags & MSG_PROBE) || len) | |
621 | goto back_from_confirm; | |
622 | err = 0; | |
623 | goto out; | |
624 | } | |
625 | ||
bb0cd2fb CG |
626 | static int ping_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
627 | size_t len, int noblock, int flags, int *addr_len) | |
c319b4d7 VK |
628 | { |
629 | struct inet_sock *isk = inet_sk(sk); | |
630 | struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name; | |
631 | struct sk_buff *skb; | |
632 | int copied, err; | |
633 | ||
634 | pr_debug("ping_recvmsg(sk=%p,sk->num=%u)\n", isk, isk->inet_num); | |
635 | ||
a5e7424d | 636 | err = -EOPNOTSUPP; |
c319b4d7 VK |
637 | if (flags & MSG_OOB) |
638 | goto out; | |
639 | ||
640 | if (addr_len) | |
641 | *addr_len = sizeof(*sin); | |
642 | ||
643 | if (flags & MSG_ERRQUEUE) | |
644 | return ip_recv_error(sk, msg, len); | |
645 | ||
646 | skb = skb_recv_datagram(sk, flags, noblock, &err); | |
647 | if (!skb) | |
648 | goto out; | |
649 | ||
650 | copied = skb->len; | |
651 | if (copied > len) { | |
652 | msg->msg_flags |= MSG_TRUNC; | |
653 | copied = len; | |
654 | } | |
655 | ||
656 | /* Don't bother checking the checksum */ | |
657 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
658 | if (err) | |
659 | goto done; | |
660 | ||
661 | sock_recv_timestamp(msg, sk, skb); | |
662 | ||
663 | /* Copy the address. */ | |
664 | if (sin) { | |
665 | sin->sin_family = AF_INET; | |
666 | sin->sin_port = 0 /* skb->h.uh->source */; | |
667 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; | |
668 | memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
669 | } | |
670 | if (isk->cmsg_flags) | |
671 | ip_cmsg_recv(msg, skb); | |
672 | err = copied; | |
673 | ||
674 | done: | |
675 | skb_free_datagram(sk, skb); | |
676 | out: | |
677 | pr_debug("ping_recvmsg -> %d\n", err); | |
678 | return err; | |
679 | } | |
680 | ||
681 | static int ping_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
682 | { | |
683 | pr_debug("ping_queue_rcv_skb(sk=%p,sk->num=%d,skb=%p)\n", | |
058bd4d2 | 684 | inet_sk(sk), inet_sk(sk)->inet_num, skb); |
c319b4d7 | 685 | if (sock_queue_rcv_skb(sk, skb) < 0) { |
c319b4d7 VK |
686 | kfree_skb(skb); |
687 | pr_debug("ping_queue_rcv_skb -> failed\n"); | |
688 | return -1; | |
689 | } | |
690 | return 0; | |
691 | } | |
692 | ||
693 | ||
694 | /* | |
695 | * All we need to do is get the socket. | |
696 | */ | |
697 | ||
698 | void ping_rcv(struct sk_buff *skb) | |
699 | { | |
700 | struct sock *sk; | |
701 | struct net *net = dev_net(skb->dev); | |
702 | struct iphdr *iph = ip_hdr(skb); | |
703 | struct icmphdr *icmph = icmp_hdr(skb); | |
747465ef ED |
704 | __be32 saddr = iph->saddr; |
705 | __be32 daddr = iph->daddr; | |
c319b4d7 VK |
706 | |
707 | /* We assume the packet has already been checked by icmp_rcv */ | |
708 | ||
709 | pr_debug("ping_rcv(skb=%p,id=%04x,seq=%04x)\n", | |
058bd4d2 | 710 | skb, ntohs(icmph->un.echo.id), ntohs(icmph->un.echo.sequence)); |
c319b4d7 VK |
711 | |
712 | /* Push ICMP header back */ | |
713 | skb_push(skb, skb->data - (u8 *)icmph); | |
714 | ||
715 | sk = ping_v4_lookup(net, saddr, daddr, ntohs(icmph->un.echo.id), | |
716 | skb->dev->ifindex); | |
717 | if (sk != NULL) { | |
718 | pr_debug("rcv on socket %p\n", sk); | |
719 | ping_queue_rcv_skb(sk, skb_get(skb)); | |
720 | sock_put(sk); | |
721 | return; | |
722 | } | |
723 | pr_debug("no socket, dropping\n"); | |
724 | ||
725 | /* We're called from icmp_rcv(). kfree_skb() is done there. */ | |
726 | } | |
727 | ||
728 | struct proto ping_prot = { | |
729 | .name = "PING", | |
730 | .owner = THIS_MODULE, | |
731 | .init = ping_init_sock, | |
732 | .close = ping_close, | |
733 | .connect = ip4_datagram_connect, | |
734 | .disconnect = udp_disconnect, | |
c319b4d7 VK |
735 | .setsockopt = ip_setsockopt, |
736 | .getsockopt = ip_getsockopt, | |
737 | .sendmsg = ping_sendmsg, | |
738 | .recvmsg = ping_recvmsg, | |
739 | .bind = ping_bind, | |
740 | .backlog_rcv = ping_queue_rcv_skb, | |
741 | .hash = ping_v4_hash, | |
742 | .unhash = ping_v4_unhash, | |
743 | .get_port = ping_v4_get_port, | |
744 | .obj_size = sizeof(struct inet_sock), | |
745 | }; | |
746 | EXPORT_SYMBOL(ping_prot); | |
747 | ||
748 | #ifdef CONFIG_PROC_FS | |
749 | ||
750 | static struct sock *ping_get_first(struct seq_file *seq, int start) | |
751 | { | |
752 | struct sock *sk; | |
753 | struct ping_iter_state *state = seq->private; | |
754 | struct net *net = seq_file_net(seq); | |
755 | ||
756 | for (state->bucket = start; state->bucket < PING_HTABLE_SIZE; | |
757 | ++state->bucket) { | |
758 | struct hlist_nulls_node *node; | |
75e308c8 CG |
759 | struct hlist_nulls_head *hslot; |
760 | ||
761 | hslot = &ping_table.hash[state->bucket]; | |
c319b4d7 VK |
762 | |
763 | if (hlist_nulls_empty(hslot)) | |
764 | continue; | |
765 | ||
766 | sk_nulls_for_each(sk, node, hslot) { | |
767 | if (net_eq(sock_net(sk), net)) | |
768 | goto found; | |
769 | } | |
770 | } | |
771 | sk = NULL; | |
772 | found: | |
773 | return sk; | |
774 | } | |
775 | ||
776 | static struct sock *ping_get_next(struct seq_file *seq, struct sock *sk) | |
777 | { | |
778 | struct ping_iter_state *state = seq->private; | |
779 | struct net *net = seq_file_net(seq); | |
780 | ||
781 | do { | |
782 | sk = sk_nulls_next(sk); | |
783 | } while (sk && (!net_eq(sock_net(sk), net))); | |
784 | ||
785 | if (!sk) | |
786 | return ping_get_first(seq, state->bucket + 1); | |
787 | return sk; | |
788 | } | |
789 | ||
790 | static struct sock *ping_get_idx(struct seq_file *seq, loff_t pos) | |
791 | { | |
792 | struct sock *sk = ping_get_first(seq, 0); | |
793 | ||
794 | if (sk) | |
795 | while (pos && (sk = ping_get_next(seq, sk)) != NULL) | |
796 | --pos; | |
797 | return pos ? NULL : sk; | |
798 | } | |
799 | ||
800 | static void *ping_seq_start(struct seq_file *seq, loff_t *pos) | |
801 | { | |
802 | struct ping_iter_state *state = seq->private; | |
803 | state->bucket = 0; | |
804 | ||
805 | read_lock_bh(&ping_table.lock); | |
806 | ||
807 | return *pos ? ping_get_idx(seq, *pos-1) : SEQ_START_TOKEN; | |
808 | } | |
809 | ||
810 | static void *ping_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
811 | { | |
812 | struct sock *sk; | |
813 | ||
814 | if (v == SEQ_START_TOKEN) | |
815 | sk = ping_get_idx(seq, 0); | |
816 | else | |
817 | sk = ping_get_next(seq, v); | |
818 | ||
819 | ++*pos; | |
820 | return sk; | |
821 | } | |
822 | ||
823 | static void ping_seq_stop(struct seq_file *seq, void *v) | |
824 | { | |
825 | read_unlock_bh(&ping_table.lock); | |
826 | } | |
827 | ||
828 | static void ping_format_sock(struct sock *sp, struct seq_file *f, | |
829 | int bucket, int *len) | |
830 | { | |
831 | struct inet_sock *inet = inet_sk(sp); | |
832 | __be32 dest = inet->inet_daddr; | |
833 | __be32 src = inet->inet_rcv_saddr; | |
834 | __u16 destp = ntohs(inet->inet_dport); | |
835 | __u16 srcp = ntohs(inet->inet_sport); | |
836 | ||
837 | seq_printf(f, "%5d: %08X:%04X %08X:%04X" | |
838 | " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %d%n", | |
839 | bucket, src, srcp, dest, destp, sp->sk_state, | |
840 | sk_wmem_alloc_get(sp), | |
841 | sk_rmem_alloc_get(sp), | |
a7cb5a49 EB |
842 | 0, 0L, 0, |
843 | from_kuid_munged(seq_user_ns(f), sock_i_uid(sp)), | |
844 | 0, sock_i_ino(sp), | |
c319b4d7 VK |
845 | atomic_read(&sp->sk_refcnt), sp, |
846 | atomic_read(&sp->sk_drops), len); | |
847 | } | |
848 | ||
849 | static int ping_seq_show(struct seq_file *seq, void *v) | |
850 | { | |
851 | if (v == SEQ_START_TOKEN) | |
852 | seq_printf(seq, "%-127s\n", | |
853 | " sl local_address rem_address st tx_queue " | |
854 | "rx_queue tr tm->when retrnsmt uid timeout " | |
855 | "inode ref pointer drops"); | |
856 | else { | |
857 | struct ping_iter_state *state = seq->private; | |
858 | int len; | |
859 | ||
860 | ping_format_sock(v, seq, state->bucket, &len); | |
861 | seq_printf(seq, "%*s\n", 127 - len, ""); | |
862 | } | |
863 | return 0; | |
864 | } | |
865 | ||
866 | static const struct seq_operations ping_seq_ops = { | |
867 | .show = ping_seq_show, | |
868 | .start = ping_seq_start, | |
869 | .next = ping_seq_next, | |
870 | .stop = ping_seq_stop, | |
871 | }; | |
872 | ||
873 | static int ping_seq_open(struct inode *inode, struct file *file) | |
874 | { | |
875 | return seq_open_net(inode, file, &ping_seq_ops, | |
876 | sizeof(struct ping_iter_state)); | |
877 | } | |
878 | ||
879 | static const struct file_operations ping_seq_fops = { | |
880 | .open = ping_seq_open, | |
881 | .read = seq_read, | |
882 | .llseek = seq_lseek, | |
883 | .release = seq_release_net, | |
884 | }; | |
885 | ||
886 | static int ping_proc_register(struct net *net) | |
887 | { | |
888 | struct proc_dir_entry *p; | |
889 | int rc = 0; | |
890 | ||
891 | p = proc_net_fops_create(net, "icmp", S_IRUGO, &ping_seq_fops); | |
892 | if (!p) | |
893 | rc = -ENOMEM; | |
894 | return rc; | |
895 | } | |
896 | ||
897 | static void ping_proc_unregister(struct net *net) | |
898 | { | |
899 | proc_net_remove(net, "icmp"); | |
900 | } | |
901 | ||
902 | ||
903 | static int __net_init ping_proc_init_net(struct net *net) | |
904 | { | |
905 | return ping_proc_register(net); | |
906 | } | |
907 | ||
908 | static void __net_exit ping_proc_exit_net(struct net *net) | |
909 | { | |
910 | ping_proc_unregister(net); | |
911 | } | |
912 | ||
913 | static struct pernet_operations ping_net_ops = { | |
914 | .init = ping_proc_init_net, | |
915 | .exit = ping_proc_exit_net, | |
916 | }; | |
917 | ||
918 | int __init ping_proc_init(void) | |
919 | { | |
920 | return register_pernet_subsys(&ping_net_ops); | |
921 | } | |
922 | ||
923 | void ping_proc_exit(void) | |
924 | { | |
925 | unregister_pernet_subsys(&ping_net_ops); | |
926 | } | |
927 | ||
928 | #endif | |
929 | ||
930 | void __init ping_init(void) | |
931 | { | |
932 | int i; | |
933 | ||
934 | for (i = 0; i < PING_HTABLE_SIZE; i++) | |
935 | INIT_HLIST_NULLS_HEAD(&ping_table.hash[i], i); | |
936 | rwlock_init(&ping_table.lock); | |
937 | } |