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