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MAINTAINERS: EDAC: add Mauro and Borislav as interim patch collectors
[linux-2.6/btrfs-unstable.git] / net / ipv4 / ping.c
blob2d11c094296e77ceb36b4121df01d7e5318de591
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
23 #include <linux/uaccess.h>
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/icmp.h>
37 #include <net/protocol.h>
38 #include <linux/skbuff.h>
39 #include <linux/proc_fs.h>
40 #include <linux/export.h>
41 #include <net/sock.h>
42 #include <net/ping.h>
43 #include <net/udp.h>
44 #include <net/route.h>
45 #include <net/inet_common.h>
46 #include <net/checksum.h>
47
48 #if IS_ENABLED(CONFIG_IPV6)
49 #include <linux/in6.h>
50 #include <linux/icmpv6.h>
51 #include <net/addrconf.h>
52 #include <net/ipv6.h>
53 #include <net/transp_v6.h>
54 #endif
55
56 struct ping_table {
57 struct hlist_nulls_head hash[PING_HTABLE_SIZE];
58 rwlock_t lock;
59 };
60
61 static struct ping_table ping_table;
62 struct pingv6_ops pingv6_ops;
63 EXPORT_SYMBOL_GPL(pingv6_ops);
64
65 static u16 ping_port_rover;
66
67 static inline int ping_hashfn(struct net *net, unsigned int num, unsigned int mask)
68 {
69 int res = (num + net_hash_mix(net)) & mask;
70
71 pr_debug("hash(%d) = %d\n", num, res);
72 return res;
73 }
74 EXPORT_SYMBOL_GPL(ping_hash);
75
76 static inline struct hlist_nulls_head *ping_hashslot(struct ping_table *table,
77 struct net *net, unsigned int num)
78 {
79 return &table->hash[ping_hashfn(net, num, PING_HTABLE_MASK)];
80 }
81
82 int ping_get_port(struct sock *sk, unsigned short ident)
83 {
84 struct hlist_nulls_node *node;
85 struct hlist_nulls_head *hlist;
86 struct inet_sock *isk, *isk2;
87 struct sock *sk2 = NULL;
88
89 isk = inet_sk(sk);
90 write_lock_bh(&ping_table.lock);
91 if (ident == 0) {
92 u32 i;
93 u16 result = ping_port_rover + 1;
94
95 for (i = 0; i < (1L << 16); i++, result++) {
96 if (!result)
97 result++; /* avoid zero */
98 hlist = ping_hashslot(&ping_table, sock_net(sk),
99 result);
100 ping_portaddr_for_each_entry(sk2, node, hlist) {
101 isk2 = inet_sk(sk2);
102
103 if (isk2->inet_num == result)
104 goto next_port;
105 }
106
107 /* found */
108 ping_port_rover = ident = result;
109 break;
110 next_port:
111 ;
112 }
113 if (i >= (1L << 16))
114 goto fail;
115 } else {
116 hlist = ping_hashslot(&ping_table, sock_net(sk), ident);
117 ping_portaddr_for_each_entry(sk2, node, hlist) {
118 isk2 = inet_sk(sk2);
119
120 /* BUG? Why is this reuse and not reuseaddr? ping.c
121 * doesn't turn off SO_REUSEADDR, and it doesn't expect
122 * that other ping processes can steal its packets.
123 */
124 if ((isk2->inet_num == ident) &&
125 (sk2 != sk) &&
126 (!sk2->sk_reuse || !sk->sk_reuse))
127 goto fail;
128 }
129 }
130
131 pr_debug("found port/ident = %d\n", ident);
132 isk->inet_num = ident;
133 if (sk_unhashed(sk)) {
134 pr_debug("was not hashed\n");
135 sock_hold(sk);
136 hlist_nulls_add_head(&sk->sk_nulls_node, hlist);
137 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
138 }
139 write_unlock_bh(&ping_table.lock);
140 return 0;
141
142 fail:
143 write_unlock_bh(&ping_table.lock);
144 return 1;
145 }
146 EXPORT_SYMBOL_GPL(ping_get_port);
147
148 void ping_hash(struct sock *sk)
149 {
150 pr_debug("ping_hash(sk->port=%u)\n", inet_sk(sk)->inet_num);
151 BUG(); /* "Please do not press this button again." */
152 }
153
154 void ping_unhash(struct sock *sk)
155 {
156 struct inet_sock *isk = inet_sk(sk);
157 pr_debug("ping_unhash(isk=%p,isk->num=%u)\n", isk, isk->inet_num);
158 if (sk_hashed(sk)) {
159 write_lock_bh(&ping_table.lock);
160 hlist_nulls_del(&sk->sk_nulls_node);
161 sock_put(sk);
162 isk->inet_num = 0;
163 isk->inet_sport = 0;
164 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
165 write_unlock_bh(&ping_table.lock);
166 }
167 }
168 EXPORT_SYMBOL_GPL(ping_unhash);
169
170 static struct sock *ping_lookup(struct net *net, struct sk_buff *skb, u16 ident)
171 {
172 struct hlist_nulls_head *hslot = ping_hashslot(&ping_table, net, ident);
173 struct sock *sk = NULL;
174 struct inet_sock *isk;
175 struct hlist_nulls_node *hnode;
176 int dif = skb->dev->ifindex;
177
178 if (skb->protocol == htons(ETH_P_IP)) {
179 pr_debug("try to find: num = %d, daddr = %pI4, dif = %d\n",
180 (int)ident, &ip_hdr(skb)->daddr, dif);
181 #if IS_ENABLED(CONFIG_IPV6)
182 } else if (skb->protocol == htons(ETH_P_IPV6)) {
183 pr_debug("try to find: num = %d, daddr = %pI6c, dif = %d\n",
184 (int)ident, &ipv6_hdr(skb)->daddr, dif);
185 #endif
186 }
187
188 read_lock_bh(&ping_table.lock);
189
190 ping_portaddr_for_each_entry(sk, hnode, hslot) {
191 isk = inet_sk(sk);
192
193 pr_debug("iterate\n");
194 if (isk->inet_num != ident)
195 continue;
196
197 if (skb->protocol == htons(ETH_P_IP) &&
198 sk->sk_family == AF_INET) {
199 pr_debug("found: %p: num=%d, daddr=%pI4, dif=%d\n", sk,
200 (int) isk->inet_num, &isk->inet_rcv_saddr,
201 sk->sk_bound_dev_if);
202
203 if (isk->inet_rcv_saddr &&
204 isk->inet_rcv_saddr != ip_hdr(skb)->daddr)
205 continue;
206 #if IS_ENABLED(CONFIG_IPV6)
207 } else if (skb->protocol == htons(ETH_P_IPV6) &&
208 sk->sk_family == AF_INET6) {
209
210 pr_debug("found: %p: num=%d, daddr=%pI6c, dif=%d\n", sk,
211 (int) isk->inet_num,
212 &sk->sk_v6_rcv_saddr,
213 sk->sk_bound_dev_if);
214
215 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) &&
216 !ipv6_addr_equal(&sk->sk_v6_rcv_saddr,
217 &ipv6_hdr(skb)->daddr))
218 continue;
219 #endif
220 }
221
222 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)
223 continue;
224
225 sock_hold(sk);
226 goto exit;
227 }
228
229 sk = NULL;
230 exit:
231 read_unlock_bh(&ping_table.lock);
232
233 return sk;
234 }
235
236 static void inet_get_ping_group_range_net(struct net *net, kgid_t *low,
237 kgid_t *high)
238 {
239 kgid_t *data = net->ipv4.sysctl_ping_group_range;
240 unsigned int seq;
241
242 do {
243 seq = read_seqbegin(&net->ipv4.sysctl_local_ports.lock);
244
245 *low = data[0];
246 *high = data[1];
247 } while (read_seqretry(&net->ipv4.sysctl_local_ports.lock, seq));
248 }
249
250
251 int ping_init_sock(struct sock *sk)
252 {
253 struct net *net = sock_net(sk);
254 kgid_t group = current_egid();
255 struct group_info *group_info = get_current_groups();
256 int i, j, count = group_info->ngroups;
257 kgid_t low, high;
258
259 inet_get_ping_group_range_net(net, &low, &high);
260 if (gid_lte(low, group) && gid_lte(group, high))
261 return 0;
262
263 for (i = 0; i < group_info->nblocks; i++) {
264 int cp_count = min_t(int, NGROUPS_PER_BLOCK, count);
265 for (j = 0; j < cp_count; j++) {
266 kgid_t gid = group_info->blocks[i][j];
267 if (gid_lte(low, gid) && gid_lte(gid, high))
268 return 0;
269 }
270
271 count -= cp_count;
272 }
273
274 return -EACCES;
275 }
276 EXPORT_SYMBOL_GPL(ping_init_sock);
277
278 void ping_close(struct sock *sk, long timeout)
279 {
280 pr_debug("ping_close(sk=%p,sk->num=%u)\n",
281 inet_sk(sk), inet_sk(sk)->inet_num);
282 pr_debug("isk->refcnt = %d\n", sk->sk_refcnt.counter);
283
284 sk_common_release(sk);
285 }
286 EXPORT_SYMBOL_GPL(ping_close);
287
288 /* Checks the bind address and possibly modifies sk->sk_bound_dev_if. */
289 static int ping_check_bind_addr(struct sock *sk, struct inet_sock *isk,
290 struct sockaddr *uaddr, int addr_len) {
291 struct net *net = sock_net(sk);
292 if (sk->sk_family == AF_INET) {
293 struct sockaddr_in *addr = (struct sockaddr_in *) uaddr;
294 int chk_addr_ret;
295
296 if (addr_len < sizeof(*addr))
297 return -EINVAL;
298
299 pr_debug("ping_check_bind_addr(sk=%p,addr=%pI4,port=%d)\n",
300 sk, &addr->sin_addr.s_addr, ntohs(addr->sin_port));
301
302 chk_addr_ret = inet_addr_type(net, addr->sin_addr.s_addr);
303
304 if (addr->sin_addr.s_addr == htonl(INADDR_ANY))
305 chk_addr_ret = RTN_LOCAL;
306
307 if ((sysctl_ip_nonlocal_bind == 0 &&
308 isk->freebind == 0 && isk->transparent == 0 &&
309 chk_addr_ret != RTN_LOCAL) ||
310 chk_addr_ret == RTN_MULTICAST ||
311 chk_addr_ret == RTN_BROADCAST)
312 return -EADDRNOTAVAIL;
313
314 #if IS_ENABLED(CONFIG_IPV6)
315 } else if (sk->sk_family == AF_INET6) {
316 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr;
317 int addr_type, scoped, has_addr;
318 struct net_device *dev = NULL;
319
320 if (addr_len < sizeof(*addr))
321 return -EINVAL;
322
323 if (addr->sin6_family != AF_INET6)
324 return -EINVAL;
325
326 pr_debug("ping_check_bind_addr(sk=%p,addr=%pI6c,port=%d)\n",
327 sk, addr->sin6_addr.s6_addr, ntohs(addr->sin6_port));
328
329 addr_type = ipv6_addr_type(&addr->sin6_addr);
330 scoped = __ipv6_addr_needs_scope_id(addr_type);
331 if ((addr_type != IPV6_ADDR_ANY &&
332 !(addr_type & IPV6_ADDR_UNICAST)) ||
333 (scoped && !addr->sin6_scope_id))
334 return -EINVAL;
335
336 rcu_read_lock();
337 if (addr->sin6_scope_id) {
338 dev = dev_get_by_index_rcu(net, addr->sin6_scope_id);
339 if (!dev) {
340 rcu_read_unlock();
341 return -ENODEV;
342 }
343 }
344 has_addr = pingv6_ops.ipv6_chk_addr(net, &addr->sin6_addr, dev,
345 scoped);
346 rcu_read_unlock();
347
348 if (!(isk->freebind || isk->transparent || has_addr ||
349 addr_type == IPV6_ADDR_ANY))
350 return -EADDRNOTAVAIL;
351
352 if (scoped)
353 sk->sk_bound_dev_if = addr->sin6_scope_id;
354 #endif
355 } else {
356 return -EAFNOSUPPORT;
357 }
358 return 0;
359 }
360
361 static void ping_set_saddr(struct sock *sk, struct sockaddr *saddr)
362 {
363 if (saddr->sa_family == AF_INET) {
364 struct inet_sock *isk = inet_sk(sk);
365 struct sockaddr_in *addr = (struct sockaddr_in *) saddr;
366 isk->inet_rcv_saddr = isk->inet_saddr = addr->sin_addr.s_addr;
367 #if IS_ENABLED(CONFIG_IPV6)
368 } else if (saddr->sa_family == AF_INET6) {
369 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) saddr;
370 struct ipv6_pinfo *np = inet6_sk(sk);
371 sk->sk_v6_rcv_saddr = np->saddr = addr->sin6_addr;
372 #endif
373 }
374 }
375
376 static void ping_clear_saddr(struct sock *sk, int dif)
377 {
378 sk->sk_bound_dev_if = dif;
379 if (sk->sk_family == AF_INET) {
380 struct inet_sock *isk = inet_sk(sk);
381 isk->inet_rcv_saddr = isk->inet_saddr = 0;
382 #if IS_ENABLED(CONFIG_IPV6)
383 } else if (sk->sk_family == AF_INET6) {
384 struct ipv6_pinfo *np = inet6_sk(sk);
385 memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr));
386 memset(&np->saddr, 0, sizeof(np->saddr));
387 #endif
388 }
389 }
390 /*
391 * We need our own bind because there are no privileged id's == local ports.
392 * Moreover, we don't allow binding to multi- and broadcast addresses.
393 */
394
395 int ping_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
396 {
397 struct inet_sock *isk = inet_sk(sk);
398 unsigned short snum;
399 int err;
400 int dif = sk->sk_bound_dev_if;
401
402 err = ping_check_bind_addr(sk, isk, uaddr, addr_len);
403 if (err)
404 return err;
405
406 lock_sock(sk);
407
408 err = -EINVAL;
409 if (isk->inet_num != 0)
410 goto out;
411
412 err = -EADDRINUSE;
413 ping_set_saddr(sk, uaddr);
414 snum = ntohs(((struct sockaddr_in *)uaddr)->sin_port);
415 if (ping_get_port(sk, snum) != 0) {
416 ping_clear_saddr(sk, dif);
417 goto out;
418 }
419
420 pr_debug("after bind(): num = %d, dif = %d\n",
421 (int)isk->inet_num,
422 (int)sk->sk_bound_dev_if);
423
424 err = 0;
425 if (sk->sk_family == AF_INET && isk->inet_rcv_saddr)
426 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
427 #if IS_ENABLED(CONFIG_IPV6)
428 if (sk->sk_family == AF_INET6 && !ipv6_addr_any(&sk->sk_v6_rcv_saddr))
429 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
430 #endif
431
432 if (snum)
433 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
434 isk->inet_sport = htons(isk->inet_num);
435 isk->inet_daddr = 0;
436 isk->inet_dport = 0;
437
438 #if IS_ENABLED(CONFIG_IPV6)
439 if (sk->sk_family == AF_INET6)
440 memset(&sk->sk_v6_daddr, 0, sizeof(sk->sk_v6_daddr));
441 #endif
442
443 sk_dst_reset(sk);
444 out:
445 release_sock(sk);
446 pr_debug("ping_v4_bind -> %d\n", err);
447 return err;
448 }
449 EXPORT_SYMBOL_GPL(ping_bind);
450
451 /*
452 * Is this a supported type of ICMP message?
453 */
454
455 static inline int ping_supported(int family, int type, int code)
456 {
457 return (family == AF_INET && type == ICMP_ECHO && code == 0) ||
458 (family == AF_INET6 && type == ICMPV6_ECHO_REQUEST && code == 0);
459 }
460
461 /*
462 * This routine is called by the ICMP module when it gets some
463 * sort of error condition.
464 */
465
466 void ping_err(struct sk_buff *skb, int offset, u32 info)
467 {
468 int family;
469 struct icmphdr *icmph;
470 struct inet_sock *inet_sock;
471 int type;
472 int code;
473 struct net *net = dev_net(skb->dev);
474 struct sock *sk;
475 int harderr;
476 int err;
477
478 if (skb->protocol == htons(ETH_P_IP)) {
479 family = AF_INET;
480 type = icmp_hdr(skb)->type;
481 code = icmp_hdr(skb)->code;
482 icmph = (struct icmphdr *)(skb->data + offset);
483 } else if (skb->protocol == htons(ETH_P_IPV6)) {
484 family = AF_INET6;
485 type = icmp6_hdr(skb)->icmp6_type;
486 code = icmp6_hdr(skb)->icmp6_code;
487 icmph = (struct icmphdr *) (skb->data + offset);
488 } else {
489 BUG();
490 }
491
492 /* We assume the packet has already been checked by icmp_unreach */
493
494 if (!ping_supported(family, icmph->type, icmph->code))
495 return;
496
497 pr_debug("ping_err(proto=0x%x,type=%d,code=%d,id=%04x,seq=%04x)\n",
498 skb->protocol, type, code, ntohs(icmph->un.echo.id),
499 ntohs(icmph->un.echo.sequence));
500
501 sk = ping_lookup(net, skb, ntohs(icmph->un.echo.id));
502 if (sk == NULL) {
503 pr_debug("no socket, dropping\n");
504 return; /* No socket for error */
505 }
506 pr_debug("err on socket %p\n", sk);
507
508 err = 0;
509 harderr = 0;
510 inet_sock = inet_sk(sk);
511
512 if (skb->protocol == htons(ETH_P_IP)) {
513 switch (type) {
514 default:
515 case ICMP_TIME_EXCEEDED:
516 err = EHOSTUNREACH;
517 break;
518 case ICMP_SOURCE_QUENCH:
519 /* This is not a real error but ping wants to see it.
520 * Report it with some fake errno.
521 */
522 err = EREMOTEIO;
523 break;
524 case ICMP_PARAMETERPROB:
525 err = EPROTO;
526 harderr = 1;
527 break;
528 case ICMP_DEST_UNREACH:
529 if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */
530 ipv4_sk_update_pmtu(skb, sk, info);
531 if (inet_sock->pmtudisc != IP_PMTUDISC_DONT) {
532 err = EMSGSIZE;
533 harderr = 1;
534 break;
535 }
536 goto out;
537 }
538 err = EHOSTUNREACH;
539 if (code <= NR_ICMP_UNREACH) {
540 harderr = icmp_err_convert[code].fatal;
541 err = icmp_err_convert[code].errno;
542 }
543 break;
544 case ICMP_REDIRECT:
545 /* See ICMP_SOURCE_QUENCH */
546 ipv4_sk_redirect(skb, sk);
547 err = EREMOTEIO;
548 break;
549 }
550 #if IS_ENABLED(CONFIG_IPV6)
551 } else if (skb->protocol == htons(ETH_P_IPV6)) {
552 harderr = pingv6_ops.icmpv6_err_convert(type, code, &err);
553 #endif
554 }
555
556 /*
557 * RFC1122: OK. Passes ICMP errors back to application, as per
558 * 4.1.3.3.
559 */
560 if ((family == AF_INET && !inet_sock->recverr) ||
561 (family == AF_INET6 && !inet6_sk(sk)->recverr)) {
562 if (!harderr || sk->sk_state != TCP_ESTABLISHED)
563 goto out;
564 } else {
565 if (family == AF_INET) {
566 ip_icmp_error(sk, skb, err, 0 /* no remote port */,
567 info, (u8 *)icmph);
568 #if IS_ENABLED(CONFIG_IPV6)
569 } else if (family == AF_INET6) {
570 pingv6_ops.ipv6_icmp_error(sk, skb, err, 0,
571 info, (u8 *)icmph);
572 #endif
573 }
574 }
575 sk->sk_err = err;
576 sk->sk_error_report(sk);
577 out:
578 sock_put(sk);
579 }
580 EXPORT_SYMBOL_GPL(ping_err);
581
582 /*
583 * Copy and checksum an ICMP Echo packet from user space into a buffer
584 * starting from the payload.
585 */
586
587 int ping_getfrag(void *from, char *to,
588 int offset, int fraglen, int odd, struct sk_buff *skb)
589 {
590 struct pingfakehdr *pfh = (struct pingfakehdr *)from;
591
592 if (offset == 0) {
593 if (fraglen < sizeof(struct icmphdr))
594 BUG();
595 if (csum_partial_copy_fromiovecend(to + sizeof(struct icmphdr),
596 pfh->iov, 0, fraglen - sizeof(struct icmphdr),
597 &pfh->wcheck))
598 return -EFAULT;
599 } else if (offset < sizeof(struct icmphdr)) {
600 BUG();
601 } else {
602 if (csum_partial_copy_fromiovecend
603 (to, pfh->iov, offset - sizeof(struct icmphdr),
604 fraglen, &pfh->wcheck))
605 return -EFAULT;
606 }
607
608 #if IS_ENABLED(CONFIG_IPV6)
609 /* For IPv6, checksum each skb as we go along, as expected by
610 * icmpv6_push_pending_frames. For IPv4, accumulate the checksum in
611 * wcheck, it will be finalized in ping_v4_push_pending_frames.
612 */
613 if (pfh->family == AF_INET6) {
614 skb->csum = pfh->wcheck;
615 skb->ip_summed = CHECKSUM_NONE;
616 pfh->wcheck = 0;
617 }
618 #endif
619
620 return 0;
621 }
622 EXPORT_SYMBOL_GPL(ping_getfrag);
623
624 static int ping_v4_push_pending_frames(struct sock *sk, struct pingfakehdr *pfh,
625 struct flowi4 *fl4)
626 {
627 struct sk_buff *skb = skb_peek(&sk->sk_write_queue);
628
629 pfh->wcheck = csum_partial((char *)&pfh->icmph,
630 sizeof(struct icmphdr), pfh->wcheck);
631 pfh->icmph.checksum = csum_fold(pfh->wcheck);
632 memcpy(icmp_hdr(skb), &pfh->icmph, sizeof(struct icmphdr));
633 skb->ip_summed = CHECKSUM_NONE;
634 return ip_push_pending_frames(sk, fl4);
635 }
636
637 int ping_common_sendmsg(int family, struct msghdr *msg, size_t len,
638 void *user_icmph, size_t icmph_len) {
639 u8 type, code;
640
641 if (len > 0xFFFF)
642 return -EMSGSIZE;
643
644 /*
645 * Check the flags.
646 */
647
648 /* Mirror BSD error message compatibility */
649 if (msg->msg_flags & MSG_OOB)
650 return -EOPNOTSUPP;
651
652 /*
653 * Fetch the ICMP header provided by the userland.
654 * iovec is modified! The ICMP header is consumed.
655 */
656 if (memcpy_fromiovec(user_icmph, msg->msg_iov, icmph_len))
657 return -EFAULT;
658
659 if (family == AF_INET) {
660 type = ((struct icmphdr *) user_icmph)->type;
661 code = ((struct icmphdr *) user_icmph)->code;
662 #if IS_ENABLED(CONFIG_IPV6)
663 } else if (family == AF_INET6) {
664 type = ((struct icmp6hdr *) user_icmph)->icmp6_type;
665 code = ((struct icmp6hdr *) user_icmph)->icmp6_code;
666 #endif
667 } else {
668 BUG();
669 }
670
671 if (!ping_supported(family, type, code))
672 return -EINVAL;
673
674 return 0;
675 }
676 EXPORT_SYMBOL_GPL(ping_common_sendmsg);
677
678 static int ping_v4_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
679 size_t len)
680 {
681 struct net *net = sock_net(sk);
682 struct flowi4 fl4;
683 struct inet_sock *inet = inet_sk(sk);
684 struct ipcm_cookie ipc;
685 struct icmphdr user_icmph;
686 struct pingfakehdr pfh;
687 struct rtable *rt = NULL;
688 struct ip_options_data opt_copy;
689 int free = 0;
690 __be32 saddr, daddr, faddr;
691 u8 tos;
692 int err;
693
694 pr_debug("ping_v4_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num);
695
696 err = ping_common_sendmsg(AF_INET, msg, len, &user_icmph,
697 sizeof(user_icmph));
698 if (err)
699 return err;
700
701 /*
702 * Get and verify the address.
703 */
704
705 if (msg->msg_name) {
706 DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name);
707 if (msg->msg_namelen < sizeof(*usin))
708 return -EINVAL;
709 if (usin->sin_family != AF_INET)
710 return -EINVAL;
711 daddr = usin->sin_addr.s_addr;
712 /* no remote port */
713 } else {
714 if (sk->sk_state != TCP_ESTABLISHED)
715 return -EDESTADDRREQ;
716 daddr = inet->inet_daddr;
717 /* no remote port */
718 }
719
720 ipc.addr = inet->inet_saddr;
721 ipc.opt = NULL;
722 ipc.oif = sk->sk_bound_dev_if;
723 ipc.tx_flags = 0;
724 ipc.ttl = 0;
725 ipc.tos = -1;
726
727 sock_tx_timestamp(sk, &ipc.tx_flags);
728
729 if (msg->msg_controllen) {
730 err = ip_cmsg_send(sock_net(sk), msg, &ipc);
731 if (err)
732 return err;
733 if (ipc.opt)
734 free = 1;
735 }
736 if (!ipc.opt) {
737 struct ip_options_rcu *inet_opt;
738
739 rcu_read_lock();
740 inet_opt = rcu_dereference(inet->inet_opt);
741 if (inet_opt) {
742 memcpy(&opt_copy, inet_opt,
743 sizeof(*inet_opt) + inet_opt->opt.optlen);
744 ipc.opt = &opt_copy.opt;
745 }
746 rcu_read_unlock();
747 }
748
749 saddr = ipc.addr;
750 ipc.addr = faddr = daddr;
751
752 if (ipc.opt && ipc.opt->opt.srr) {
753 if (!daddr)
754 return -EINVAL;
755 faddr = ipc.opt->opt.faddr;
756 }
757 tos = get_rttos(&ipc, inet);
758 if (sock_flag(sk, SOCK_LOCALROUTE) ||
759 (msg->msg_flags & MSG_DONTROUTE) ||
760 (ipc.opt && ipc.opt->opt.is_strictroute)) {
761 tos |= RTO_ONLINK;
762 }
763
764 if (ipv4_is_multicast(daddr)) {
765 if (!ipc.oif)
766 ipc.oif = inet->mc_index;
767 if (!saddr)
768 saddr = inet->mc_addr;
769 } else if (!ipc.oif)
770 ipc.oif = inet->uc_index;
771
772 flowi4_init_output(&fl4, ipc.oif, sk->sk_mark, tos,
773 RT_SCOPE_UNIVERSE, sk->sk_protocol,
774 inet_sk_flowi_flags(sk), faddr, saddr, 0, 0);
775
776 security_sk_classify_flow(sk, flowi4_to_flowi(&fl4));
777 rt = ip_route_output_flow(net, &fl4, sk);
778 if (IS_ERR(rt)) {
779 err = PTR_ERR(rt);
780 rt = NULL;
781 if (err == -ENETUNREACH)
782 IP_INC_STATS(net, IPSTATS_MIB_OUTNOROUTES);
783 goto out;
784 }
785
786 err = -EACCES;
787 if ((rt->rt_flags & RTCF_BROADCAST) &&
788 !sock_flag(sk, SOCK_BROADCAST))
789 goto out;
790
791 if (msg->msg_flags & MSG_CONFIRM)
792 goto do_confirm;
793 back_from_confirm:
794
795 if (!ipc.addr)
796 ipc.addr = fl4.daddr;
797
798 lock_sock(sk);
799
800 pfh.icmph.type = user_icmph.type; /* already checked */
801 pfh.icmph.code = user_icmph.code; /* ditto */
802 pfh.icmph.checksum = 0;
803 pfh.icmph.un.echo.id = inet->inet_sport;
804 pfh.icmph.un.echo.sequence = user_icmph.un.echo.sequence;
805 pfh.iov = msg->msg_iov;
806 pfh.wcheck = 0;
807 pfh.family = AF_INET;
808
809 err = ip_append_data(sk, &fl4, ping_getfrag, &pfh, len,
810 0, &ipc, &rt, msg->msg_flags);
811 if (err)
812 ip_flush_pending_frames(sk);
813 else
814 err = ping_v4_push_pending_frames(sk, &pfh, &fl4);
815 release_sock(sk);
816
817 out:
818 ip_rt_put(rt);
819 if (free)
820 kfree(ipc.opt);
821 if (!err) {
822 icmp_out_count(sock_net(sk), user_icmph.type);
823 return len;
824 }
825 return err;
826
827 do_confirm:
828 dst_confirm(&rt->dst);
829 if (!(msg->msg_flags & MSG_PROBE) || len)
830 goto back_from_confirm;
831 err = 0;
832 goto out;
833 }
834
835 int ping_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
836 size_t len, int noblock, int flags, int *addr_len)
837 {
838 struct inet_sock *isk = inet_sk(sk);
839 int family = sk->sk_family;
840 struct sk_buff *skb;
841 int copied, err;
842
843 pr_debug("ping_recvmsg(sk=%p,sk->num=%u)\n", isk, isk->inet_num);
844
845 err = -EOPNOTSUPP;
846 if (flags & MSG_OOB)
847 goto out;
848
849 if (flags & MSG_ERRQUEUE) {
850 if (family == AF_INET) {
851 return ip_recv_error(sk, msg, len, addr_len);
852 #if IS_ENABLED(CONFIG_IPV6)
853 } else if (family == AF_INET6) {
854 return pingv6_ops.ipv6_recv_error(sk, msg, len,
855 addr_len);
856 #endif
857 }
858 }
859
860 skb = skb_recv_datagram(sk, flags, noblock, &err);
861 if (!skb)
862 goto out;
863
864 copied = skb->len;
865 if (copied > len) {
866 msg->msg_flags |= MSG_TRUNC;
867 copied = len;
868 }
869
870 /* Don't bother checking the checksum */
871 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
872 if (err)
873 goto done;
874
875 sock_recv_timestamp(msg, sk, skb);
876
877 /* Copy the address and add cmsg data. */
878 if (family == AF_INET) {
879 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
880
881 if (sin) {
882 sin->sin_family = AF_INET;
883 sin->sin_port = 0 /* skb->h.uh->source */;
884 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
885 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
886 *addr_len = sizeof(*sin);
887 }
888
889 if (isk->cmsg_flags)
890 ip_cmsg_recv(msg, skb);
891
892 #if IS_ENABLED(CONFIG_IPV6)
893 } else if (family == AF_INET6) {
894 struct ipv6_pinfo *np = inet6_sk(sk);
895 struct ipv6hdr *ip6 = ipv6_hdr(skb);
896 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
897
898 if (sin6) {
899 sin6->sin6_family = AF_INET6;
900 sin6->sin6_port = 0;
901 sin6->sin6_addr = ip6->saddr;
902 sin6->sin6_flowinfo = 0;
903 if (np->sndflow)
904 sin6->sin6_flowinfo = ip6_flowinfo(ip6);
905 sin6->sin6_scope_id =
906 ipv6_iface_scope_id(&sin6->sin6_addr,
907 IP6CB(skb)->iif);
908 *addr_len = sizeof(*sin6);
909 }
910
911 if (inet6_sk(sk)->rxopt.all)
912 pingv6_ops.ip6_datagram_recv_common_ctl(sk, msg, skb);
913 if (skb->protocol == htons(ETH_P_IPV6) &&
914 inet6_sk(sk)->rxopt.all)
915 pingv6_ops.ip6_datagram_recv_specific_ctl(sk, msg, skb);
916 else if (skb->protocol == htons(ETH_P_IP) && isk->cmsg_flags)
917 ip_cmsg_recv(msg, skb);
918 #endif
919 } else {
920 BUG();
921 }
922
923 err = copied;
924
925 done:
926 skb_free_datagram(sk, skb);
927 out:
928 pr_debug("ping_recvmsg -> %d\n", err);
929 return err;
930 }
931 EXPORT_SYMBOL_GPL(ping_recvmsg);
932
933 int ping_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
934 {
935 pr_debug("ping_queue_rcv_skb(sk=%p,sk->num=%d,skb=%p)\n",
936 inet_sk(sk), inet_sk(sk)->inet_num, skb);
937 if (sock_queue_rcv_skb(sk, skb) < 0) {
938 kfree_skb(skb);
939 pr_debug("ping_queue_rcv_skb -> failed\n");
940 return -1;
941 }
942 return 0;
943 }
944 EXPORT_SYMBOL_GPL(ping_queue_rcv_skb);
945
946
947 /*
948 * All we need to do is get the socket.
949 */
950
951 void ping_rcv(struct sk_buff *skb)
952 {
953 struct sock *sk;
954 struct net *net = dev_net(skb->dev);
955 struct icmphdr *icmph = icmp_hdr(skb);
956
957 /* We assume the packet has already been checked by icmp_rcv */
958
959 pr_debug("ping_rcv(skb=%p,id=%04x,seq=%04x)\n",
960 skb, ntohs(icmph->un.echo.id), ntohs(icmph->un.echo.sequence));
961
962 /* Push ICMP header back */
963 skb_push(skb, skb->data - (u8 *)icmph);
964
965 sk = ping_lookup(net, skb, ntohs(icmph->un.echo.id));
966 if (sk != NULL) {
967 pr_debug("rcv on socket %p\n", sk);
968 ping_queue_rcv_skb(sk, skb_get(skb));
969 sock_put(sk);
970 return;
971 }
972 pr_debug("no socket, dropping\n");
973
974 /* We're called from icmp_rcv(). kfree_skb() is done there. */
975 }
976 EXPORT_SYMBOL_GPL(ping_rcv);
977
978 struct proto ping_prot = {
979 .name = "PING",
980 .owner = THIS_MODULE,
981 .init = ping_init_sock,
982 .close = ping_close,
983 .connect = ip4_datagram_connect,
984 .disconnect = udp_disconnect,
985 .setsockopt = ip_setsockopt,
986 .getsockopt = ip_getsockopt,
987 .sendmsg = ping_v4_sendmsg,
988 .recvmsg = ping_recvmsg,
989 .bind = ping_bind,
990 .backlog_rcv = ping_queue_rcv_skb,
991 .release_cb = ip4_datagram_release_cb,
992 .hash = ping_hash,
993 .unhash = ping_unhash,
994 .get_port = ping_get_port,
995 .obj_size = sizeof(struct inet_sock),
996 };
997 EXPORT_SYMBOL(ping_prot);
998
999 #ifdef CONFIG_PROC_FS
1000
1001 static struct sock *ping_get_first(struct seq_file *seq, int start)
1002 {
1003 struct sock *sk;
1004 struct ping_iter_state *state = seq->private;
1005 struct net *net = seq_file_net(seq);
1006
1007 for (state->bucket = start; state->bucket < PING_HTABLE_SIZE;
1008 ++state->bucket) {
1009 struct hlist_nulls_node *node;
1010 struct hlist_nulls_head *hslot;
1011
1012 hslot = &ping_table.hash[state->bucket];
1013
1014 if (hlist_nulls_empty(hslot))
1015 continue;
1016
1017 sk_nulls_for_each(sk, node, hslot) {
1018 if (net_eq(sock_net(sk), net) &&
1019 sk->sk_family == state->family)
1020 goto found;
1021 }
1022 }
1023 sk = NULL;
1024 found:
1025 return sk;
1026 }
1027
1028 static struct sock *ping_get_next(struct seq_file *seq, struct sock *sk)
1029 {
1030 struct ping_iter_state *state = seq->private;
1031 struct net *net = seq_file_net(seq);
1032
1033 do {
1034 sk = sk_nulls_next(sk);
1035 } while (sk && (!net_eq(sock_net(sk), net)));
1036
1037 if (!sk)
1038 return ping_get_first(seq, state->bucket + 1);
1039 return sk;
1040 }
1041
1042 static struct sock *ping_get_idx(struct seq_file *seq, loff_t pos)
1043 {
1044 struct sock *sk = ping_get_first(seq, 0);
1045
1046 if (sk)
1047 while (pos && (sk = ping_get_next(seq, sk)) != NULL)
1048 --pos;
1049 return pos ? NULL : sk;
1050 }
1051
1052 void *ping_seq_start(struct seq_file *seq, loff_t *pos, sa_family_t family)
1053 {
1054 struct ping_iter_state *state = seq->private;
1055 state->bucket = 0;
1056 state->family = family;
1057
1058 read_lock_bh(&ping_table.lock);
1059
1060 return *pos ? ping_get_idx(seq, *pos-1) : SEQ_START_TOKEN;
1061 }
1062 EXPORT_SYMBOL_GPL(ping_seq_start);
1063
1064 static void *ping_v4_seq_start(struct seq_file *seq, loff_t *pos)
1065 {
1066 return ping_seq_start(seq, pos, AF_INET);
1067 }
1068
1069 void *ping_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1070 {
1071 struct sock *sk;
1072
1073 if (v == SEQ_START_TOKEN)
1074 sk = ping_get_idx(seq, 0);
1075 else
1076 sk = ping_get_next(seq, v);
1077
1078 ++*pos;
1079 return sk;
1080 }
1081 EXPORT_SYMBOL_GPL(ping_seq_next);
1082
1083 void ping_seq_stop(struct seq_file *seq, void *v)
1084 {
1085 read_unlock_bh(&ping_table.lock);
1086 }
1087 EXPORT_SYMBOL_GPL(ping_seq_stop);
1088
1089 static void ping_v4_format_sock(struct sock *sp, struct seq_file *f,
1090 int bucket)
1091 {
1092 struct inet_sock *inet = inet_sk(sp);
1093 __be32 dest = inet->inet_daddr;
1094 __be32 src = inet->inet_rcv_saddr;
1095 __u16 destp = ntohs(inet->inet_dport);
1096 __u16 srcp = ntohs(inet->inet_sport);
1097
1098 seq_printf(f, "%5d: %08X:%04X %08X:%04X"
1099 " %02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d",
1100 bucket, src, srcp, dest, destp, sp->sk_state,
1101 sk_wmem_alloc_get(sp),
1102 sk_rmem_alloc_get(sp),
1103 0, 0L, 0,
1104 from_kuid_munged(seq_user_ns(f), sock_i_uid(sp)),
1105 0, sock_i_ino(sp),
1106 atomic_read(&sp->sk_refcnt), sp,
1107 atomic_read(&sp->sk_drops));
1108 }
1109
1110 static int ping_v4_seq_show(struct seq_file *seq, void *v)
1111 {
1112 seq_setwidth(seq, 127);
1113 if (v == SEQ_START_TOKEN)
1114 seq_puts(seq, " sl local_address rem_address st tx_queue "
1115 "rx_queue tr tm->when retrnsmt uid timeout "
1116 "inode ref pointer drops");
1117 else {
1118 struct ping_iter_state *state = seq->private;
1119
1120 ping_v4_format_sock(v, seq, state->bucket);
1121 }
1122 seq_pad(seq, '\n');
1123 return 0;
1124 }
1125
1126 static const struct seq_operations ping_v4_seq_ops = {
1127 .show = ping_v4_seq_show,
1128 .start = ping_v4_seq_start,
1129 .next = ping_seq_next,
1130 .stop = ping_seq_stop,
1131 };
1132
1133 static int ping_seq_open(struct inode *inode, struct file *file)
1134 {
1135 struct ping_seq_afinfo *afinfo = PDE_DATA(inode);
1136 return seq_open_net(inode, file, &afinfo->seq_ops,
1137 sizeof(struct ping_iter_state));
1138 }
1139
1140 const struct file_operations ping_seq_fops = {
1141 .open = ping_seq_open,
1142 .read = seq_read,
1143 .llseek = seq_lseek,
1144 .release = seq_release_net,
1145 };
1146 EXPORT_SYMBOL_GPL(ping_seq_fops);
1147
1148 static struct ping_seq_afinfo ping_v4_seq_afinfo = {
1149 .name = "icmp",
1150 .family = AF_INET,
1151 .seq_fops = &ping_seq_fops,
1152 .seq_ops = {
1153 .start = ping_v4_seq_start,
1154 .show = ping_v4_seq_show,
1155 .next = ping_seq_next,
1156 .stop = ping_seq_stop,
1157 },
1158 };
1159
1160 int ping_proc_register(struct net *net, struct ping_seq_afinfo *afinfo)
1161 {
1162 struct proc_dir_entry *p;
1163 p = proc_create_data(afinfo->name, S_IRUGO, net->proc_net,
1164 afinfo->seq_fops, afinfo);
1165 if (!p)
1166 return -ENOMEM;
1167 return 0;
1168 }
1169 EXPORT_SYMBOL_GPL(ping_proc_register);
1170
1171 void ping_proc_unregister(struct net *net, struct ping_seq_afinfo *afinfo)
1172 {
1173 remove_proc_entry(afinfo->name, net->proc_net);
1174 }
1175 EXPORT_SYMBOL_GPL(ping_proc_unregister);
1176
1177 static int __net_init ping_v4_proc_init_net(struct net *net)
1178 {
1179 return ping_proc_register(net, &ping_v4_seq_afinfo);
1180 }
1181
1182 static void __net_exit ping_v4_proc_exit_net(struct net *net)
1183 {
1184 ping_proc_unregister(net, &ping_v4_seq_afinfo);
1185 }
1186
1187 static struct pernet_operations ping_v4_net_ops = {
1188 .init = ping_v4_proc_init_net,
1189 .exit = ping_v4_proc_exit_net,
1190 };
1191
1192 int __init ping_proc_init(void)
1193 {
1194 return register_pernet_subsys(&ping_v4_net_ops);
1195 }
1196
1197 void ping_proc_exit(void)
1198 {
1199 unregister_pernet_subsys(&ping_v4_net_ops);
1200 }
1201
1202 #endif
1203
1204 void __init ping_init(void)
1205 {
1206 int i;
1207
1208 for (i = 0; i < PING_HTABLE_SIZE; i++)
1209 INIT_HLIST_NULLS_HEAD(&ping_table.hash[i], i);
1210 rwlock_init(&ping_table.lock);
1211 }
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