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Merge branch 'for-3.11' of git://linux-nfs.org/~bfields/linux
[linux-2.6.git] / net / ipv4 / ping.c
blob746427c9e7199513c12f4254ce048234f108a35d
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
57 struct ping_table ping_table;
58 struct pingv6_ops pingv6_ops;
59 EXPORT_SYMBOL_GPL(pingv6_ops);
60
61 static u16 ping_port_rover;
62
63 static inline int ping_hashfn(struct net *net, unsigned int num, unsigned int mask)
64 {
65 int res = (num + net_hash_mix(net)) & mask;
66
67 pr_debug("hash(%d) = %d\n", num, res);
68 return res;
69 }
70 EXPORT_SYMBOL_GPL(ping_hash);
71
72 static inline struct hlist_nulls_head *ping_hashslot(struct ping_table *table,
73 struct net *net, unsigned int num)
74 {
75 return &table->hash[ping_hashfn(net, num, PING_HTABLE_MASK)];
76 }
77
78 int ping_get_port(struct sock *sk, unsigned short ident)
79 {
80 struct hlist_nulls_node *node;
81 struct hlist_nulls_head *hlist;
82 struct inet_sock *isk, *isk2;
83 struct sock *sk2 = NULL;
84
85 isk = inet_sk(sk);
86 write_lock_bh(&ping_table.lock);
87 if (ident == 0) {
88 u32 i;
89 u16 result = ping_port_rover + 1;
90
91 for (i = 0; i < (1L << 16); i++, result++) {
92 if (!result)
93 result++; /* avoid zero */
94 hlist = ping_hashslot(&ping_table, sock_net(sk),
95 result);
96 ping_portaddr_for_each_entry(sk2, node, hlist) {
97 isk2 = inet_sk(sk2);
98
99 if (isk2->inet_num == result)
100 goto next_port;
101 }
102
103 /* found */
104 ping_port_rover = ident = result;
105 break;
106 next_port:
107 ;
108 }
109 if (i >= (1L << 16))
110 goto fail;
111 } else {
112 hlist = ping_hashslot(&ping_table, sock_net(sk), ident);
113 ping_portaddr_for_each_entry(sk2, node, hlist) {
114 isk2 = inet_sk(sk2);
115
116 /* BUG? Why is this reuse and not reuseaddr? ping.c
117 * doesn't turn off SO_REUSEADDR, and it doesn't expect
118 * that other ping processes can steal its packets.
119 */
120 if ((isk2->inet_num == ident) &&
121 (sk2 != sk) &&
122 (!sk2->sk_reuse || !sk->sk_reuse))
123 goto fail;
124 }
125 }
126
127 pr_debug("found port/ident = %d\n", ident);
128 isk->inet_num = ident;
129 if (sk_unhashed(sk)) {
130 pr_debug("was not hashed\n");
131 sock_hold(sk);
132 hlist_nulls_add_head(&sk->sk_nulls_node, hlist);
133 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
134 }
135 write_unlock_bh(&ping_table.lock);
136 return 0;
137
138 fail:
139 write_unlock_bh(&ping_table.lock);
140 return 1;
141 }
142 EXPORT_SYMBOL_GPL(ping_get_port);
143
144 void ping_hash(struct sock *sk)
145 {
146 pr_debug("ping_hash(sk->port=%u)\n", inet_sk(sk)->inet_num);
147 BUG(); /* "Please do not press this button again." */
148 }
149
150 void ping_unhash(struct sock *sk)
151 {
152 struct inet_sock *isk = inet_sk(sk);
153 pr_debug("ping_unhash(isk=%p,isk->num=%u)\n", isk, isk->inet_num);
154 if (sk_hashed(sk)) {
155 write_lock_bh(&ping_table.lock);
156 hlist_nulls_del(&sk->sk_nulls_node);
157 sock_put(sk);
158 isk->inet_num = 0;
159 isk->inet_sport = 0;
160 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
161 write_unlock_bh(&ping_table.lock);
162 }
163 }
164 EXPORT_SYMBOL_GPL(ping_unhash);
165
166 static struct sock *ping_lookup(struct net *net, struct sk_buff *skb, u16 ident)
167 {
168 struct hlist_nulls_head *hslot = ping_hashslot(&ping_table, net, ident);
169 struct sock *sk = NULL;
170 struct inet_sock *isk;
171 struct hlist_nulls_node *hnode;
172 int dif = skb->dev->ifindex;
173
174 if (skb->protocol == htons(ETH_P_IP)) {
175 pr_debug("try to find: num = %d, daddr = %pI4, dif = %d\n",
176 (int)ident, &ip_hdr(skb)->daddr, dif);
177 #if IS_ENABLED(CONFIG_IPV6)
178 } else if (skb->protocol == htons(ETH_P_IPV6)) {
179 pr_debug("try to find: num = %d, daddr = %pI6c, dif = %d\n",
180 (int)ident, &ipv6_hdr(skb)->daddr, dif);
181 #endif
182 }
183
184 read_lock_bh(&ping_table.lock);
185
186 ping_portaddr_for_each_entry(sk, hnode, hslot) {
187 isk = inet_sk(sk);
188
189 pr_debug("iterate\n");
190 if (isk->inet_num != ident)
191 continue;
192
193 if (skb->protocol == htons(ETH_P_IP) &&
194 sk->sk_family == AF_INET) {
195 pr_debug("found: %p: num=%d, daddr=%pI4, dif=%d\n", sk,
196 (int) isk->inet_num, &isk->inet_rcv_saddr,
197 sk->sk_bound_dev_if);
198
199 if (isk->inet_rcv_saddr &&
200 isk->inet_rcv_saddr != ip_hdr(skb)->daddr)
201 continue;
202 #if IS_ENABLED(CONFIG_IPV6)
203 } else if (skb->protocol == htons(ETH_P_IPV6) &&
204 sk->sk_family == AF_INET6) {
205 struct ipv6_pinfo *np = inet6_sk(sk);
206
207 pr_debug("found: %p: num=%d, daddr=%pI6c, dif=%d\n", sk,
208 (int) isk->inet_num,
209 &inet6_sk(sk)->rcv_saddr,
210 sk->sk_bound_dev_if);
211
212 if (!ipv6_addr_any(&np->rcv_saddr) &&
213 !ipv6_addr_equal(&np->rcv_saddr,
214 &ipv6_hdr(skb)->daddr))
215 continue;
216 #endif
217 }
218
219 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)
220 continue;
221
222 sock_hold(sk);
223 goto exit;
224 }
225
226 sk = NULL;
227 exit:
228 read_unlock_bh(&ping_table.lock);
229
230 return sk;
231 }
232
233 static void inet_get_ping_group_range_net(struct net *net, kgid_t *low,
234 kgid_t *high)
235 {
236 kgid_t *data = net->ipv4.sysctl_ping_group_range;
237 unsigned int seq;
238
239 do {
240 seq = read_seqbegin(&sysctl_local_ports.lock);
241
242 *low = data[0];
243 *high = data[1];
244 } while (read_seqretry(&sysctl_local_ports.lock, seq));
245 }
246
247
248 int ping_init_sock(struct sock *sk)
249 {
250 struct net *net = sock_net(sk);
251 kgid_t group = current_egid();
252 struct group_info *group_info = get_current_groups();
253 int i, j, count = group_info->ngroups;
254 kgid_t low, high;
255
256 inet_get_ping_group_range_net(net, &low, &high);
257 if (gid_lte(low, group) && gid_lte(group, high))
258 return 0;
259
260 for (i = 0; i < group_info->nblocks; i++) {
261 int cp_count = min_t(int, NGROUPS_PER_BLOCK, count);
262 for (j = 0; j < cp_count; j++) {
263 kgid_t gid = group_info->blocks[i][j];
264 if (gid_lte(low, gid) && gid_lte(gid, high))
265 return 0;
266 }
267
268 count -= cp_count;
269 }
270
271 return -EACCES;
272 }
273 EXPORT_SYMBOL_GPL(ping_init_sock);
274
275 void ping_close(struct sock *sk, long timeout)
276 {
277 pr_debug("ping_close(sk=%p,sk->num=%u)\n",
278 inet_sk(sk), inet_sk(sk)->inet_num);
279 pr_debug("isk->refcnt = %d\n", sk->sk_refcnt.counter);
280
281 sk_common_release(sk);
282 }
283 EXPORT_SYMBOL_GPL(ping_close);
284
285 /* Checks the bind address and possibly modifies sk->sk_bound_dev_if. */
286 static int ping_check_bind_addr(struct sock *sk, struct inet_sock *isk,
287 struct sockaddr *uaddr, int addr_len) {
288 struct net *net = sock_net(sk);
289 if (sk->sk_family == AF_INET) {
290 struct sockaddr_in *addr = (struct sockaddr_in *) uaddr;
291 int chk_addr_ret;
292
293 if (addr_len < sizeof(*addr))
294 return -EINVAL;
295
296 pr_debug("ping_check_bind_addr(sk=%p,addr=%pI4,port=%d)\n",
297 sk, &addr->sin_addr.s_addr, ntohs(addr->sin_port));
298
299 chk_addr_ret = inet_addr_type(net, addr->sin_addr.s_addr);
300
301 if (addr->sin_addr.s_addr == htonl(INADDR_ANY))
302 chk_addr_ret = RTN_LOCAL;
303
304 if ((sysctl_ip_nonlocal_bind == 0 &&
305 isk->freebind == 0 && isk->transparent == 0 &&
306 chk_addr_ret != RTN_LOCAL) ||
307 chk_addr_ret == RTN_MULTICAST ||
308 chk_addr_ret == RTN_BROADCAST)
309 return -EADDRNOTAVAIL;
310
311 #if IS_ENABLED(CONFIG_IPV6)
312 } else if (sk->sk_family == AF_INET6) {
313 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr;
314 int addr_type, scoped, has_addr;
315 struct net_device *dev = NULL;
316
317 if (addr_len < sizeof(*addr))
318 return -EINVAL;
319
320 pr_debug("ping_check_bind_addr(sk=%p,addr=%pI6c,port=%d)\n",
321 sk, addr->sin6_addr.s6_addr, ntohs(addr->sin6_port));
322
323 addr_type = ipv6_addr_type(&addr->sin6_addr);
324 scoped = __ipv6_addr_needs_scope_id(addr_type);
325 if ((addr_type != IPV6_ADDR_ANY &&
326 !(addr_type & IPV6_ADDR_UNICAST)) ||
327 (scoped && !addr->sin6_scope_id))
328 return -EINVAL;
329
330 rcu_read_lock();
331 if (addr->sin6_scope_id) {
332 dev = dev_get_by_index_rcu(net, addr->sin6_scope_id);
333 if (!dev) {
334 rcu_read_unlock();
335 return -ENODEV;
336 }
337 }
338 has_addr = pingv6_ops.ipv6_chk_addr(net, &addr->sin6_addr, dev,
339 scoped);
340 rcu_read_unlock();
341
342 if (!(isk->freebind || isk->transparent || has_addr ||
343 addr_type == IPV6_ADDR_ANY))
344 return -EADDRNOTAVAIL;
345
346 if (scoped)
347 sk->sk_bound_dev_if = addr->sin6_scope_id;
348 #endif
349 } else {
350 return -EAFNOSUPPORT;
351 }
352 return 0;
353 }
354
355 static void ping_set_saddr(struct sock *sk, struct sockaddr *saddr)
356 {
357 if (saddr->sa_family == AF_INET) {
358 struct inet_sock *isk = inet_sk(sk);
359 struct sockaddr_in *addr = (struct sockaddr_in *) saddr;
360 isk->inet_rcv_saddr = isk->inet_saddr = addr->sin_addr.s_addr;
361 #if IS_ENABLED(CONFIG_IPV6)
362 } else if (saddr->sa_family == AF_INET6) {
363 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) saddr;
364 struct ipv6_pinfo *np = inet6_sk(sk);
365 np->rcv_saddr = np->saddr = addr->sin6_addr;
366 #endif
367 }
368 }
369
370 static void ping_clear_saddr(struct sock *sk, int dif)
371 {
372 sk->sk_bound_dev_if = dif;
373 if (sk->sk_family == AF_INET) {
374 struct inet_sock *isk = inet_sk(sk);
375 isk->inet_rcv_saddr = isk->inet_saddr = 0;
376 #if IS_ENABLED(CONFIG_IPV6)
377 } else if (sk->sk_family == AF_INET6) {
378 struct ipv6_pinfo *np = inet6_sk(sk);
379 memset(&np->rcv_saddr, 0, sizeof(np->rcv_saddr));
380 memset(&np->saddr, 0, sizeof(np->saddr));
381 #endif
382 }
383 }
384 /*
385 * We need our own bind because there are no privileged id's == local ports.
386 * Moreover, we don't allow binding to multi- and broadcast addresses.
387 */
388
389 int ping_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
390 {
391 struct inet_sock *isk = inet_sk(sk);
392 unsigned short snum;
393 int err;
394 int dif = sk->sk_bound_dev_if;
395
396 err = ping_check_bind_addr(sk, isk, uaddr, addr_len);
397 if (err)
398 return err;
399
400 lock_sock(sk);
401
402 err = -EINVAL;
403 if (isk->inet_num != 0)
404 goto out;
405
406 err = -EADDRINUSE;
407 ping_set_saddr(sk, uaddr);
408 snum = ntohs(((struct sockaddr_in *)uaddr)->sin_port);
409 if (ping_get_port(sk, snum) != 0) {
410 ping_clear_saddr(sk, dif);
411 goto out;
412 }
413
414 pr_debug("after bind(): num = %d, dif = %d\n",
415 (int)isk->inet_num,
416 (int)sk->sk_bound_dev_if);
417
418 err = 0;
419 if ((sk->sk_family == AF_INET && isk->inet_rcv_saddr) ||
420 (sk->sk_family == AF_INET6 &&
421 !ipv6_addr_any(&inet6_sk(sk)->rcv_saddr)))
422 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
423
424 if (snum)
425 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
426 isk->inet_sport = htons(isk->inet_num);
427 isk->inet_daddr = 0;
428 isk->inet_dport = 0;
429
430 #if IS_ENABLED(CONFIG_IPV6)
431 if (sk->sk_family == AF_INET6)
432 memset(&inet6_sk(sk)->daddr, 0, sizeof(inet6_sk(sk)->daddr));
433 #endif
434
435 sk_dst_reset(sk);
436 out:
437 release_sock(sk);
438 pr_debug("ping_v4_bind -> %d\n", err);
439 return err;
440 }
441 EXPORT_SYMBOL_GPL(ping_bind);
442
443 /*
444 * Is this a supported type of ICMP message?
445 */
446
447 static inline int ping_supported(int family, int type, int code)
448 {
449 return (family == AF_INET && type == ICMP_ECHO && code == 0) ||
450 (family == AF_INET6 && type == ICMPV6_ECHO_REQUEST && code == 0);
451 }
452
453 /*
454 * This routine is called by the ICMP module when it gets some
455 * sort of error condition.
456 */
457
458 void ping_err(struct sk_buff *skb, int offset, u32 info)
459 {
460 int family;
461 struct icmphdr *icmph;
462 struct inet_sock *inet_sock;
463 int type;
464 int code;
465 struct net *net = dev_net(skb->dev);
466 struct sock *sk;
467 int harderr;
468 int err;
469
470 if (skb->protocol == htons(ETH_P_IP)) {
471 family = AF_INET;
472 type = icmp_hdr(skb)->type;
473 code = icmp_hdr(skb)->code;
474 icmph = (struct icmphdr *)(skb->data + offset);
475 } else if (skb->protocol == htons(ETH_P_IPV6)) {
476 family = AF_INET6;
477 type = icmp6_hdr(skb)->icmp6_type;
478 code = icmp6_hdr(skb)->icmp6_code;
479 icmph = (struct icmphdr *) (skb->data + offset);
480 } else {
481 BUG();
482 }
483
484 /* We assume the packet has already been checked by icmp_unreach */
485
486 if (!ping_supported(family, icmph->type, icmph->code))
487 return;
488
489 pr_debug("ping_err(proto=0x%x,type=%d,code=%d,id=%04x,seq=%04x)\n",
490 skb->protocol, type, code, ntohs(icmph->un.echo.id),
491 ntohs(icmph->un.echo.sequence));
492
493 sk = ping_lookup(net, skb, ntohs(icmph->un.echo.id));
494 if (sk == NULL) {
495 pr_debug("no socket, dropping\n");
496 return; /* No socket for error */
497 }
498 pr_debug("err on socket %p\n", sk);
499
500 err = 0;
501 harderr = 0;
502 inet_sock = inet_sk(sk);
503
504 if (skb->protocol == htons(ETH_P_IP)) {
505 switch (type) {
506 default:
507 case ICMP_TIME_EXCEEDED:
508 err = EHOSTUNREACH;
509 break;
510 case ICMP_SOURCE_QUENCH:
511 /* This is not a real error but ping wants to see it.
512 * Report it with some fake errno.
513 */
514 err = EREMOTEIO;
515 break;
516 case ICMP_PARAMETERPROB:
517 err = EPROTO;
518 harderr = 1;
519 break;
520 case ICMP_DEST_UNREACH:
521 if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */
522 ipv4_sk_update_pmtu(skb, sk, info);
523 if (inet_sock->pmtudisc != IP_PMTUDISC_DONT) {
524 err = EMSGSIZE;
525 harderr = 1;
526 break;
527 }
528 goto out;
529 }
530 err = EHOSTUNREACH;
531 if (code <= NR_ICMP_UNREACH) {
532 harderr = icmp_err_convert[code].fatal;
533 err = icmp_err_convert[code].errno;
534 }
535 break;
536 case ICMP_REDIRECT:
537 /* See ICMP_SOURCE_QUENCH */
538 ipv4_sk_redirect(skb, sk);
539 err = EREMOTEIO;
540 break;
541 }
542 #if IS_ENABLED(CONFIG_IPV6)
543 } else if (skb->protocol == htons(ETH_P_IPV6)) {
544 harderr = pingv6_ops.icmpv6_err_convert(type, code, &err);
545 #endif
546 }
547
548 /*
549 * RFC1122: OK. Passes ICMP errors back to application, as per
550 * 4.1.3.3.
551 */
552 if ((family == AF_INET && !inet_sock->recverr) ||
553 (family == AF_INET6 && !inet6_sk(sk)->recverr)) {
554 if (!harderr || sk->sk_state != TCP_ESTABLISHED)
555 goto out;
556 } else {
557 if (family == AF_INET) {
558 ip_icmp_error(sk, skb, err, 0 /* no remote port */,
559 info, (u8 *)icmph);
560 #if IS_ENABLED(CONFIG_IPV6)
561 } else if (family == AF_INET6) {
562 pingv6_ops.ipv6_icmp_error(sk, skb, err, 0,
563 info, (u8 *)icmph);
564 #endif
565 }
566 }
567 sk->sk_err = err;
568 sk->sk_error_report(sk);
569 out:
570 sock_put(sk);
571 }
572 EXPORT_SYMBOL_GPL(ping_err);
573
574 /*
575 * Copy and checksum an ICMP Echo packet from user space into a buffer
576 * starting from the payload.
577 */
578
579 int ping_getfrag(void *from, char *to,
580 int offset, int fraglen, int odd, struct sk_buff *skb)
581 {
582 struct pingfakehdr *pfh = (struct pingfakehdr *)from;
583
584 if (offset == 0) {
585 if (fraglen < sizeof(struct icmphdr))
586 BUG();
587 if (csum_partial_copy_fromiovecend(to + sizeof(struct icmphdr),
588 pfh->iov, 0, fraglen - sizeof(struct icmphdr),
589 &pfh->wcheck))
590 return -EFAULT;
591 } else if (offset < sizeof(struct icmphdr)) {
592 BUG();
593 } else {
594 if (csum_partial_copy_fromiovecend
595 (to, pfh->iov, offset - sizeof(struct icmphdr),
596 fraglen, &pfh->wcheck))
597 return -EFAULT;
598 }
599
600 #if IS_ENABLED(CONFIG_IPV6)
601 /* For IPv6, checksum each skb as we go along, as expected by
602 * icmpv6_push_pending_frames. For IPv4, accumulate the checksum in
603 * wcheck, it will be finalized in ping_v4_push_pending_frames.
604 */
605 if (pfh->family == AF_INET6) {
606 skb->csum = pfh->wcheck;
607 skb->ip_summed = CHECKSUM_NONE;
608 pfh->wcheck = 0;
609 }
610 #endif
611
612 return 0;
613 }
614 EXPORT_SYMBOL_GPL(ping_getfrag);
615
616 static int ping_v4_push_pending_frames(struct sock *sk, struct pingfakehdr *pfh,
617 struct flowi4 *fl4)
618 {
619 struct sk_buff *skb = skb_peek(&sk->sk_write_queue);
620
621 pfh->wcheck = csum_partial((char *)&pfh->icmph,
622 sizeof(struct icmphdr), pfh->wcheck);
623 pfh->icmph.checksum = csum_fold(pfh->wcheck);
624 memcpy(icmp_hdr(skb), &pfh->icmph, sizeof(struct icmphdr));
625 skb->ip_summed = CHECKSUM_NONE;
626 return ip_push_pending_frames(sk, fl4);
627 }
628
629 int ping_common_sendmsg(int family, struct msghdr *msg, size_t len,
630 void *user_icmph, size_t icmph_len) {
631 u8 type, code;
632
633 if (len > 0xFFFF)
634 return -EMSGSIZE;
635
636 /*
637 * Check the flags.
638 */
639
640 /* Mirror BSD error message compatibility */
641 if (msg->msg_flags & MSG_OOB)
642 return -EOPNOTSUPP;
643
644 /*
645 * Fetch the ICMP header provided by the userland.
646 * iovec is modified! The ICMP header is consumed.
647 */
648 if (memcpy_fromiovec(user_icmph, msg->msg_iov, icmph_len))
649 return -EFAULT;
650
651 if (family == AF_INET) {
652 type = ((struct icmphdr *) user_icmph)->type;
653 code = ((struct icmphdr *) user_icmph)->code;
654 #if IS_ENABLED(CONFIG_IPV6)
655 } else if (family == AF_INET6) {
656 type = ((struct icmp6hdr *) user_icmph)->icmp6_type;
657 code = ((struct icmp6hdr *) user_icmph)->icmp6_code;
658 #endif
659 } else {
660 BUG();
661 }
662
663 if (!ping_supported(family, type, code))
664 return -EINVAL;
665
666 return 0;
667 }
668 EXPORT_SYMBOL_GPL(ping_common_sendmsg);
669
670 int ping_v4_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
671 size_t len)
672 {
673 struct net *net = sock_net(sk);
674 struct flowi4 fl4;
675 struct inet_sock *inet = inet_sk(sk);
676 struct ipcm_cookie ipc;
677 struct icmphdr user_icmph;
678 struct pingfakehdr pfh;
679 struct rtable *rt = NULL;
680 struct ip_options_data opt_copy;
681 int free = 0;
682 __be32 saddr, daddr, faddr;
683 u8 tos;
684 int err;
685
686 pr_debug("ping_v4_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num);
687
688 err = ping_common_sendmsg(AF_INET, msg, len, &user_icmph,
689 sizeof(user_icmph));
690 if (err)
691 return err;
692
693 /*
694 * Get and verify the address.
695 */
696
697 if (msg->msg_name) {
698 struct sockaddr_in *usin = (struct sockaddr_in *)msg->msg_name;
699 if (msg->msg_namelen < sizeof(*usin))
700 return -EINVAL;
701 if (usin->sin_family != AF_INET)
702 return -EINVAL;
703 daddr = usin->sin_addr.s_addr;
704 /* no remote port */
705 } else {
706 if (sk->sk_state != TCP_ESTABLISHED)
707 return -EDESTADDRREQ;
708 daddr = inet->inet_daddr;
709 /* no remote port */
710 }
711
712 ipc.addr = inet->inet_saddr;
713 ipc.opt = NULL;
714 ipc.oif = sk->sk_bound_dev_if;
715 ipc.tx_flags = 0;
716
717 sock_tx_timestamp(sk, &ipc.tx_flags);
718
719 if (msg->msg_controllen) {
720 err = ip_cmsg_send(sock_net(sk), msg, &ipc);
721 if (err)
722 return err;
723 if (ipc.opt)
724 free = 1;
725 }
726 if (!ipc.opt) {
727 struct ip_options_rcu *inet_opt;
728
729 rcu_read_lock();
730 inet_opt = rcu_dereference(inet->inet_opt);
731 if (inet_opt) {
732 memcpy(&opt_copy, inet_opt,
733 sizeof(*inet_opt) + inet_opt->opt.optlen);
734 ipc.opt = &opt_copy.opt;
735 }
736 rcu_read_unlock();
737 }
738
739 saddr = ipc.addr;
740 ipc.addr = faddr = daddr;
741
742 if (ipc.opt && ipc.opt->opt.srr) {
743 if (!daddr)
744 return -EINVAL;
745 faddr = ipc.opt->opt.faddr;
746 }
747 tos = RT_TOS(inet->tos);
748 if (sock_flag(sk, SOCK_LOCALROUTE) ||
749 (msg->msg_flags & MSG_DONTROUTE) ||
750 (ipc.opt && ipc.opt->opt.is_strictroute)) {
751 tos |= RTO_ONLINK;
752 }
753
754 if (ipv4_is_multicast(daddr)) {
755 if (!ipc.oif)
756 ipc.oif = inet->mc_index;
757 if (!saddr)
758 saddr = inet->mc_addr;
759 } else if (!ipc.oif)
760 ipc.oif = inet->uc_index;
761
762 flowi4_init_output(&fl4, ipc.oif, sk->sk_mark, tos,
763 RT_SCOPE_UNIVERSE, sk->sk_protocol,
764 inet_sk_flowi_flags(sk), faddr, saddr, 0, 0);
765
766 security_sk_classify_flow(sk, flowi4_to_flowi(&fl4));
767 rt = ip_route_output_flow(net, &fl4, sk);
768 if (IS_ERR(rt)) {
769 err = PTR_ERR(rt);
770 rt = NULL;
771 if (err == -ENETUNREACH)
772 IP_INC_STATS_BH(net, IPSTATS_MIB_OUTNOROUTES);
773 goto out;
774 }
775
776 err = -EACCES;
777 if ((rt->rt_flags & RTCF_BROADCAST) &&
778 !sock_flag(sk, SOCK_BROADCAST))
779 goto out;
780
781 if (msg->msg_flags & MSG_CONFIRM)
782 goto do_confirm;
783 back_from_confirm:
784
785 if (!ipc.addr)
786 ipc.addr = fl4.daddr;
787
788 lock_sock(sk);
789
790 pfh.icmph.type = user_icmph.type; /* already checked */
791 pfh.icmph.code = user_icmph.code; /* ditto */
792 pfh.icmph.checksum = 0;
793 pfh.icmph.un.echo.id = inet->inet_sport;
794 pfh.icmph.un.echo.sequence = user_icmph.un.echo.sequence;
795 pfh.iov = msg->msg_iov;
796 pfh.wcheck = 0;
797 pfh.family = AF_INET;
798
799 err = ip_append_data(sk, &fl4, ping_getfrag, &pfh, len,
800 0, &ipc, &rt, msg->msg_flags);
801 if (err)
802 ip_flush_pending_frames(sk);
803 else
804 err = ping_v4_push_pending_frames(sk, &pfh, &fl4);
805 release_sock(sk);
806
807 out:
808 ip_rt_put(rt);
809 if (free)
810 kfree(ipc.opt);
811 if (!err) {
812 icmp_out_count(sock_net(sk), user_icmph.type);
813 return len;
814 }
815 return err;
816
817 do_confirm:
818 dst_confirm(&rt->dst);
819 if (!(msg->msg_flags & MSG_PROBE) || len)
820 goto back_from_confirm;
821 err = 0;
822 goto out;
823 }
824
825 int ping_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
826 size_t len, int noblock, int flags, int *addr_len)
827 {
828 struct inet_sock *isk = inet_sk(sk);
829 int family = sk->sk_family;
830 struct sockaddr_in *sin;
831 struct sockaddr_in6 *sin6;
832 struct sk_buff *skb;
833 int copied, err;
834
835 pr_debug("ping_recvmsg(sk=%p,sk->num=%u)\n", isk, isk->inet_num);
836
837 err = -EOPNOTSUPP;
838 if (flags & MSG_OOB)
839 goto out;
840
841 if (addr_len) {
842 if (family == AF_INET)
843 *addr_len = sizeof(*sin);
844 else if (family == AF_INET6 && addr_len)
845 *addr_len = sizeof(*sin6);
846 }
847
848 if (flags & MSG_ERRQUEUE) {
849 if (family == AF_INET) {
850 return ip_recv_error(sk, msg, len);
851 #if IS_ENABLED(CONFIG_IPV6)
852 } else if (family == AF_INET6) {
853 return pingv6_ops.ipv6_recv_error(sk, msg, len);
854 #endif
855 }
856 }
857
858 skb = skb_recv_datagram(sk, flags, noblock, &err);
859 if (!skb)
860 goto out;
861
862 copied = skb->len;
863 if (copied > len) {
864 msg->msg_flags |= MSG_TRUNC;
865 copied = len;
866 }
867
868 /* Don't bother checking the checksum */
869 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
870 if (err)
871 goto done;
872
873 sock_recv_timestamp(msg, sk, skb);
874
875 /* Copy the address and add cmsg data. */
876 if (family == AF_INET) {
877 sin = (struct sockaddr_in *) msg->msg_name;
878 sin->sin_family = AF_INET;
879 sin->sin_port = 0 /* skb->h.uh->source */;
880 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
881 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
882
883 if (isk->cmsg_flags)
884 ip_cmsg_recv(msg, skb);
885
886 #if IS_ENABLED(CONFIG_IPV6)
887 } else if (family == AF_INET6) {
888 struct ipv6_pinfo *np = inet6_sk(sk);
889 struct ipv6hdr *ip6 = ipv6_hdr(skb);
890 sin6 = (struct sockaddr_in6 *) msg->msg_name;
891 sin6->sin6_family = AF_INET6;
892 sin6->sin6_port = 0;
893 sin6->sin6_addr = ip6->saddr;
894
895 sin6->sin6_flowinfo = 0;
896 if (np->sndflow)
897 sin6->sin6_flowinfo = ip6_flowinfo(ip6);
898
899 sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr,
900 IP6CB(skb)->iif);
901
902 if (inet6_sk(sk)->rxopt.all)
903 pingv6_ops.ip6_datagram_recv_ctl(sk, msg, skb);
904 #endif
905 } else {
906 BUG();
907 }
908
909 err = copied;
910
911 done:
912 skb_free_datagram(sk, skb);
913 out:
914 pr_debug("ping_recvmsg -> %d\n", err);
915 return err;
916 }
917 EXPORT_SYMBOL_GPL(ping_recvmsg);
918
919 int ping_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
920 {
921 pr_debug("ping_queue_rcv_skb(sk=%p,sk->num=%d,skb=%p)\n",
922 inet_sk(sk), inet_sk(sk)->inet_num, skb);
923 if (sock_queue_rcv_skb(sk, skb) < 0) {
924 kfree_skb(skb);
925 pr_debug("ping_queue_rcv_skb -> failed\n");
926 return -1;
927 }
928 return 0;
929 }
930 EXPORT_SYMBOL_GPL(ping_queue_rcv_skb);
931
932
933 /*
934 * All we need to do is get the socket.
935 */
936
937 void ping_rcv(struct sk_buff *skb)
938 {
939 struct sock *sk;
940 struct net *net = dev_net(skb->dev);
941 struct icmphdr *icmph = icmp_hdr(skb);
942
943 /* We assume the packet has already been checked by icmp_rcv */
944
945 pr_debug("ping_rcv(skb=%p,id=%04x,seq=%04x)\n",
946 skb, ntohs(icmph->un.echo.id), ntohs(icmph->un.echo.sequence));
947
948 /* Push ICMP header back */
949 skb_push(skb, skb->data - (u8 *)icmph);
950
951 sk = ping_lookup(net, skb, ntohs(icmph->un.echo.id));
952 if (sk != NULL) {
953 pr_debug("rcv on socket %p\n", sk);
954 ping_queue_rcv_skb(sk, skb_get(skb));
955 sock_put(sk);
956 return;
957 }
958 pr_debug("no socket, dropping\n");
959
960 /* We're called from icmp_rcv(). kfree_skb() is done there. */
961 }
962 EXPORT_SYMBOL_GPL(ping_rcv);
963
964 struct proto ping_prot = {
965 .name = "PING",
966 .owner = THIS_MODULE,
967 .init = ping_init_sock,
968 .close = ping_close,
969 .connect = ip4_datagram_connect,
970 .disconnect = udp_disconnect,
971 .setsockopt = ip_setsockopt,
972 .getsockopt = ip_getsockopt,
973 .sendmsg = ping_v4_sendmsg,
974 .recvmsg = ping_recvmsg,
975 .bind = ping_bind,
976 .backlog_rcv = ping_queue_rcv_skb,
977 .release_cb = ip4_datagram_release_cb,
978 .hash = ping_hash,
979 .unhash = ping_unhash,
980 .get_port = ping_get_port,
981 .obj_size = sizeof(struct inet_sock),
982 };
983 EXPORT_SYMBOL(ping_prot);
984
985 #ifdef CONFIG_PROC_FS
986
987 static struct sock *ping_get_first(struct seq_file *seq, int start)
988 {
989 struct sock *sk;
990 struct ping_iter_state *state = seq->private;
991 struct net *net = seq_file_net(seq);
992
993 for (state->bucket = start; state->bucket < PING_HTABLE_SIZE;
994 ++state->bucket) {
995 struct hlist_nulls_node *node;
996 struct hlist_nulls_head *hslot;
997
998 hslot = &ping_table.hash[state->bucket];
999
1000 if (hlist_nulls_empty(hslot))
1001 continue;
1002
1003 sk_nulls_for_each(sk, node, hslot) {
1004 if (net_eq(sock_net(sk), net) &&
1005 sk->sk_family == state->family)
1006 goto found;
1007 }
1008 }
1009 sk = NULL;
1010 found:
1011 return sk;
1012 }
1013
1014 static struct sock *ping_get_next(struct seq_file *seq, struct sock *sk)
1015 {
1016 struct ping_iter_state *state = seq->private;
1017 struct net *net = seq_file_net(seq);
1018
1019 do {
1020 sk = sk_nulls_next(sk);
1021 } while (sk && (!net_eq(sock_net(sk), net)));
1022
1023 if (!sk)
1024 return ping_get_first(seq, state->bucket + 1);
1025 return sk;
1026 }
1027
1028 static struct sock *ping_get_idx(struct seq_file *seq, loff_t pos)
1029 {
1030 struct sock *sk = ping_get_first(seq, 0);
1031
1032 if (sk)
1033 while (pos && (sk = ping_get_next(seq, sk)) != NULL)
1034 --pos;
1035 return pos ? NULL : sk;
1036 }
1037
1038 void *ping_seq_start(struct seq_file *seq, loff_t *pos, sa_family_t family)
1039 {
1040 struct ping_iter_state *state = seq->private;
1041 state->bucket = 0;
1042 state->family = family;
1043
1044 read_lock_bh(&ping_table.lock);
1045
1046 return *pos ? ping_get_idx(seq, *pos-1) : SEQ_START_TOKEN;
1047 }
1048 EXPORT_SYMBOL_GPL(ping_seq_start);
1049
1050 static void *ping_v4_seq_start(struct seq_file *seq, loff_t *pos)
1051 {
1052 return ping_seq_start(seq, pos, AF_INET);
1053 }
1054
1055 void *ping_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1056 {
1057 struct sock *sk;
1058
1059 if (v == SEQ_START_TOKEN)
1060 sk = ping_get_idx(seq, 0);
1061 else
1062 sk = ping_get_next(seq, v);
1063
1064 ++*pos;
1065 return sk;
1066 }
1067 EXPORT_SYMBOL_GPL(ping_seq_next);
1068
1069 void ping_seq_stop(struct seq_file *seq, void *v)
1070 {
1071 read_unlock_bh(&ping_table.lock);
1072 }
1073 EXPORT_SYMBOL_GPL(ping_seq_stop);
1074
1075 static void ping_v4_format_sock(struct sock *sp, struct seq_file *f,
1076 int bucket, int *len)
1077 {
1078 struct inet_sock *inet = inet_sk(sp);
1079 __be32 dest = inet->inet_daddr;
1080 __be32 src = inet->inet_rcv_saddr;
1081 __u16 destp = ntohs(inet->inet_dport);
1082 __u16 srcp = ntohs(inet->inet_sport);
1083
1084 seq_printf(f, "%5d: %08X:%04X %08X:%04X"
1085 " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %d%n",
1086 bucket, src, srcp, dest, destp, sp->sk_state,
1087 sk_wmem_alloc_get(sp),
1088 sk_rmem_alloc_get(sp),
1089 0, 0L, 0,
1090 from_kuid_munged(seq_user_ns(f), sock_i_uid(sp)),
1091 0, sock_i_ino(sp),
1092 atomic_read(&sp->sk_refcnt), sp,
1093 atomic_read(&sp->sk_drops), len);
1094 }
1095
1096 static int ping_v4_seq_show(struct seq_file *seq, void *v)
1097 {
1098 if (v == SEQ_START_TOKEN)
1099 seq_printf(seq, "%-127s\n",
1100 " sl local_address rem_address st tx_queue "
1101 "rx_queue tr tm->when retrnsmt uid timeout "
1102 "inode ref pointer drops");
1103 else {
1104 struct ping_iter_state *state = seq->private;
1105 int len;
1106
1107 ping_v4_format_sock(v, seq, state->bucket, &len);
1108 seq_printf(seq, "%*s\n", 127 - len, "");
1109 }
1110 return 0;
1111 }
1112
1113 static const struct seq_operations ping_v4_seq_ops = {
1114 .show = ping_v4_seq_show,
1115 .start = ping_v4_seq_start,
1116 .next = ping_seq_next,
1117 .stop = ping_seq_stop,
1118 };
1119
1120 static int ping_seq_open(struct inode *inode, struct file *file)
1121 {
1122 struct ping_seq_afinfo *afinfo = PDE_DATA(inode);
1123 return seq_open_net(inode, file, &afinfo->seq_ops,
1124 sizeof(struct ping_iter_state));
1125 }
1126
1127 const struct file_operations ping_seq_fops = {
1128 .open = ping_seq_open,
1129 .read = seq_read,
1130 .llseek = seq_lseek,
1131 .release = seq_release_net,
1132 };
1133 EXPORT_SYMBOL_GPL(ping_seq_fops);
1134
1135 static struct ping_seq_afinfo ping_v4_seq_afinfo = {
1136 .name = "icmp",
1137 .family = AF_INET,
1138 .seq_fops = &ping_seq_fops,
1139 .seq_ops = {
1140 .start = ping_v4_seq_start,
1141 .show = ping_v4_seq_show,
1142 .next = ping_seq_next,
1143 .stop = ping_seq_stop,
1144 },
1145 };
1146
1147 int ping_proc_register(struct net *net, struct ping_seq_afinfo *afinfo)
1148 {
1149 struct proc_dir_entry *p;
1150 p = proc_create_data(afinfo->name, S_IRUGO, net->proc_net,
1151 afinfo->seq_fops, afinfo);
1152 if (!p)
1153 return -ENOMEM;
1154 return 0;
1155 }
1156 EXPORT_SYMBOL_GPL(ping_proc_register);
1157
1158 void ping_proc_unregister(struct net *net, struct ping_seq_afinfo *afinfo)
1159 {
1160 remove_proc_entry(afinfo->name, net->proc_net);
1161 }
1162 EXPORT_SYMBOL_GPL(ping_proc_unregister);
1163
1164 static int __net_init ping_v4_proc_init_net(struct net *net)
1165 {
1166 return ping_proc_register(net, &ping_v4_seq_afinfo);
1167 }
1168
1169 static void __net_exit ping_v4_proc_exit_net(struct net *net)
1170 {
1171 ping_proc_unregister(net, &ping_v4_seq_afinfo);
1172 }
1173
1174 static struct pernet_operations ping_v4_net_ops = {
1175 .init = ping_v4_proc_init_net,
1176 .exit = ping_v4_proc_exit_net,
1177 };
1178
1179 int __init ping_proc_init(void)
1180 {
1181 return register_pernet_subsys(&ping_v4_net_ops);
1182 }
1183
1184 void ping_proc_exit(void)
1185 {
1186 unregister_pernet_subsys(&ping_v4_net_ops);
1187 }
1188
1189 #endif
1190
1191 void __init ping_init(void)
1192 {
1193 int i;
1194
1195 for (i = 0; i < PING_HTABLE_SIZE; i++)
1196 INIT_HLIST_NULLS_HEAD(&ping_table.hash[i], i);
1197 rwlock_init(&ping_table.lock);
1198 }
Linus' kernel tree