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Importing "grsecurity-3.1-3.19.2-201503201903.patch"
[people/ms/linux.git] / net / ipv4 / ping.c
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 } else {
221 continue;
222 }
223
224 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)
225 continue;
226
227 sock_hold(sk);
228 goto exit;
229 }
230
231 sk = NULL;
232 exit:
233 read_unlock_bh(&ping_table.lock);
234
235 return sk;
236 }
237
238 static void inet_get_ping_group_range_net(struct net *net, kgid_t *low,
239 kgid_t *high)
240 {
241 kgid_t *data = net->ipv4.ping_group_range.range;
242 unsigned int seq;
243
244 do {
245 seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
246
247 *low = data[0];
248 *high = data[1];
249 } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
250 }
251
252
253 int ping_init_sock(struct sock *sk)
254 {
255 struct net *net = sock_net(sk);
256 kgid_t group = current_egid();
257 struct group_info *group_info;
258 int i, j, count;
259 kgid_t low, high;
260 int ret = 0;
261
262 if (sk->sk_family == AF_INET6)
263 sk->sk_ipv6only = 1;
264
265 inet_get_ping_group_range_net(net, &low, &high);
266 if (gid_lte(low, group) && gid_lte(group, high))
267 return 0;
268
269 group_info = get_current_groups();
270 count = group_info->ngroups;
271 for (i = 0; i < group_info->nblocks; i++) {
272 int cp_count = min_t(int, NGROUPS_PER_BLOCK, count);
273 for (j = 0; j < cp_count; j++) {
274 kgid_t gid = group_info->blocks[i][j];
275 if (gid_lte(low, gid) && gid_lte(gid, high))
276 goto out_release_group;
277 }
278
279 count -= cp_count;
280 }
281
282 ret = -EACCES;
283
284 out_release_group:
285 put_group_info(group_info);
286 return ret;
287 }
288 EXPORT_SYMBOL_GPL(ping_init_sock);
289
290 void ping_close(struct sock *sk, long timeout)
291 {
292 pr_debug("ping_close(sk=%p,sk->num=%u)\n",
293 inet_sk(sk), inet_sk(sk)->inet_num);
294 pr_debug("isk->refcnt = %d\n", sk->sk_refcnt.counter);
295
296 sk_common_release(sk);
297 }
298 EXPORT_SYMBOL_GPL(ping_close);
299
300 /* Checks the bind address and possibly modifies sk->sk_bound_dev_if. */
301 static int ping_check_bind_addr(struct sock *sk, struct inet_sock *isk,
302 struct sockaddr *uaddr, int addr_len) {
303 struct net *net = sock_net(sk);
304 if (sk->sk_family == AF_INET) {
305 struct sockaddr_in *addr = (struct sockaddr_in *) uaddr;
306 int chk_addr_ret;
307
308 if (addr_len < sizeof(*addr))
309 return -EINVAL;
310
311 if (addr->sin_family != AF_INET &&
312 !(addr->sin_family == AF_UNSPEC &&
313 addr->sin_addr.s_addr == htonl(INADDR_ANY)))
314 return -EAFNOSUPPORT;
315
316 pr_debug("ping_check_bind_addr(sk=%p,addr=%pI4,port=%d)\n",
317 sk, &addr->sin_addr.s_addr, ntohs(addr->sin_port));
318
319 chk_addr_ret = inet_addr_type(net, addr->sin_addr.s_addr);
320
321 if (addr->sin_addr.s_addr == htonl(INADDR_ANY))
322 chk_addr_ret = RTN_LOCAL;
323
324 if ((net->ipv4.sysctl_ip_nonlocal_bind == 0 &&
325 isk->freebind == 0 && isk->transparent == 0 &&
326 chk_addr_ret != RTN_LOCAL) ||
327 chk_addr_ret == RTN_MULTICAST ||
328 chk_addr_ret == RTN_BROADCAST)
329 return -EADDRNOTAVAIL;
330
331 #if IS_ENABLED(CONFIG_IPV6)
332 } else if (sk->sk_family == AF_INET6) {
333 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr;
334 int addr_type, scoped, has_addr;
335 struct net_device *dev = NULL;
336
337 if (addr_len < sizeof(*addr))
338 return -EINVAL;
339
340 if (addr->sin6_family != AF_INET6)
341 return -EAFNOSUPPORT;
342
343 pr_debug("ping_check_bind_addr(sk=%p,addr=%pI6c,port=%d)\n",
344 sk, addr->sin6_addr.s6_addr, ntohs(addr->sin6_port));
345
346 addr_type = ipv6_addr_type(&addr->sin6_addr);
347 scoped = __ipv6_addr_needs_scope_id(addr_type);
348 if ((addr_type != IPV6_ADDR_ANY &&
349 !(addr_type & IPV6_ADDR_UNICAST)) ||
350 (scoped && !addr->sin6_scope_id))
351 return -EINVAL;
352
353 rcu_read_lock();
354 if (addr->sin6_scope_id) {
355 dev = dev_get_by_index_rcu(net, addr->sin6_scope_id);
356 if (!dev) {
357 rcu_read_unlock();
358 return -ENODEV;
359 }
360 }
361 has_addr = pingv6_ops->ipv6_chk_addr(net, &addr->sin6_addr, dev,
362 scoped);
363 rcu_read_unlock();
364
365 if (!(isk->freebind || isk->transparent || has_addr ||
366 addr_type == IPV6_ADDR_ANY))
367 return -EADDRNOTAVAIL;
368
369 if (scoped)
370 sk->sk_bound_dev_if = addr->sin6_scope_id;
371 #endif
372 } else {
373 return -EAFNOSUPPORT;
374 }
375 return 0;
376 }
377
378 static void ping_set_saddr(struct sock *sk, struct sockaddr *saddr)
379 {
380 if (saddr->sa_family == AF_INET) {
381 struct inet_sock *isk = inet_sk(sk);
382 struct sockaddr_in *addr = (struct sockaddr_in *) saddr;
383 isk->inet_rcv_saddr = isk->inet_saddr = addr->sin_addr.s_addr;
384 #if IS_ENABLED(CONFIG_IPV6)
385 } else if (saddr->sa_family == AF_INET6) {
386 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) saddr;
387 struct ipv6_pinfo *np = inet6_sk(sk);
388 sk->sk_v6_rcv_saddr = np->saddr = addr->sin6_addr;
389 #endif
390 }
391 }
392
393 static void ping_clear_saddr(struct sock *sk, int dif)
394 {
395 sk->sk_bound_dev_if = dif;
396 if (sk->sk_family == AF_INET) {
397 struct inet_sock *isk = inet_sk(sk);
398 isk->inet_rcv_saddr = isk->inet_saddr = 0;
399 #if IS_ENABLED(CONFIG_IPV6)
400 } else if (sk->sk_family == AF_INET6) {
401 struct ipv6_pinfo *np = inet6_sk(sk);
402 memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr));
403 memset(&np->saddr, 0, sizeof(np->saddr));
404 #endif
405 }
406 }
407 /*
408 * We need our own bind because there are no privileged id's == local ports.
409 * Moreover, we don't allow binding to multi- and broadcast addresses.
410 */
411
412 int ping_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
413 {
414 struct inet_sock *isk = inet_sk(sk);
415 unsigned short snum;
416 int err;
417 int dif = sk->sk_bound_dev_if;
418
419 err = ping_check_bind_addr(sk, isk, uaddr, addr_len);
420 if (err)
421 return err;
422
423 lock_sock(sk);
424
425 err = -EINVAL;
426 if (isk->inet_num != 0)
427 goto out;
428
429 err = -EADDRINUSE;
430 ping_set_saddr(sk, uaddr);
431 snum = ntohs(((struct sockaddr_in *)uaddr)->sin_port);
432 if (ping_get_port(sk, snum) != 0) {
433 ping_clear_saddr(sk, dif);
434 goto out;
435 }
436
437 pr_debug("after bind(): num = %d, dif = %d\n",
438 (int)isk->inet_num,
439 (int)sk->sk_bound_dev_if);
440
441 err = 0;
442 if (sk->sk_family == AF_INET && isk->inet_rcv_saddr)
443 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
444 #if IS_ENABLED(CONFIG_IPV6)
445 if (sk->sk_family == AF_INET6 && !ipv6_addr_any(&sk->sk_v6_rcv_saddr))
446 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
447 #endif
448
449 if (snum)
450 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
451 isk->inet_sport = htons(isk->inet_num);
452 isk->inet_daddr = 0;
453 isk->inet_dport = 0;
454
455 #if IS_ENABLED(CONFIG_IPV6)
456 if (sk->sk_family == AF_INET6)
457 memset(&sk->sk_v6_daddr, 0, sizeof(sk->sk_v6_daddr));
458 #endif
459
460 sk_dst_reset(sk);
461 out:
462 release_sock(sk);
463 pr_debug("ping_v4_bind -> %d\n", err);
464 return err;
465 }
466 EXPORT_SYMBOL_GPL(ping_bind);
467
468 /*
469 * Is this a supported type of ICMP message?
470 */
471
472 static inline int ping_supported(int family, int type, int code)
473 {
474 return (family == AF_INET && type == ICMP_ECHO && code == 0) ||
475 (family == AF_INET6 && type == ICMPV6_ECHO_REQUEST && code == 0);
476 }
477
478 /*
479 * This routine is called by the ICMP module when it gets some
480 * sort of error condition.
481 */
482
483 void ping_err(struct sk_buff *skb, int offset, u32 info)
484 {
485 int family;
486 struct icmphdr *icmph;
487 struct inet_sock *inet_sock;
488 int type;
489 int code;
490 struct net *net = dev_net(skb->dev);
491 struct sock *sk;
492 int harderr;
493 int err;
494
495 if (skb->protocol == htons(ETH_P_IP)) {
496 family = AF_INET;
497 type = icmp_hdr(skb)->type;
498 code = icmp_hdr(skb)->code;
499 icmph = (struct icmphdr *)(skb->data + offset);
500 } else if (skb->protocol == htons(ETH_P_IPV6)) {
501 family = AF_INET6;
502 type = icmp6_hdr(skb)->icmp6_type;
503 code = icmp6_hdr(skb)->icmp6_code;
504 icmph = (struct icmphdr *) (skb->data + offset);
505 } else {
506 BUG();
507 }
508
509 /* We assume the packet has already been checked by icmp_unreach */
510
511 if (!ping_supported(family, icmph->type, icmph->code))
512 return;
513
514 pr_debug("ping_err(proto=0x%x,type=%d,code=%d,id=%04x,seq=%04x)\n",
515 skb->protocol, type, code, ntohs(icmph->un.echo.id),
516 ntohs(icmph->un.echo.sequence));
517
518 sk = ping_lookup(net, skb, ntohs(icmph->un.echo.id));
519 if (sk == NULL) {
520 pr_debug("no socket, dropping\n");
521 return; /* No socket for error */
522 }
523 pr_debug("err on socket %p\n", sk);
524
525 err = 0;
526 harderr = 0;
527 inet_sock = inet_sk(sk);
528
529 if (skb->protocol == htons(ETH_P_IP)) {
530 switch (type) {
531 default:
532 case ICMP_TIME_EXCEEDED:
533 err = EHOSTUNREACH;
534 break;
535 case ICMP_SOURCE_QUENCH:
536 /* This is not a real error but ping wants to see it.
537 * Report it with some fake errno.
538 */
539 err = EREMOTEIO;
540 break;
541 case ICMP_PARAMETERPROB:
542 err = EPROTO;
543 harderr = 1;
544 break;
545 case ICMP_DEST_UNREACH:
546 if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */
547 ipv4_sk_update_pmtu(skb, sk, info);
548 if (inet_sock->pmtudisc != IP_PMTUDISC_DONT) {
549 err = EMSGSIZE;
550 harderr = 1;
551 break;
552 }
553 goto out;
554 }
555 err = EHOSTUNREACH;
556 if (code <= NR_ICMP_UNREACH) {
557 harderr = icmp_err_convert[code].fatal;
558 err = icmp_err_convert[code].errno;
559 }
560 break;
561 case ICMP_REDIRECT:
562 /* See ICMP_SOURCE_QUENCH */
563 ipv4_sk_redirect(skb, sk);
564 err = EREMOTEIO;
565 break;
566 }
567 #if IS_ENABLED(CONFIG_IPV6)
568 } else if (skb->protocol == htons(ETH_P_IPV6)) {
569 harderr = pingv6_ops->icmpv6_err_convert(type, code, &err);
570 #endif
571 }
572
573 /*
574 * RFC1122: OK. Passes ICMP errors back to application, as per
575 * 4.1.3.3.
576 */
577 if ((family == AF_INET && !inet_sock->recverr) ||
578 (family == AF_INET6 && !inet6_sk(sk)->recverr)) {
579 if (!harderr || sk->sk_state != TCP_ESTABLISHED)
580 goto out;
581 } else {
582 if (family == AF_INET) {
583 ip_icmp_error(sk, skb, err, 0 /* no remote port */,
584 info, (u8 *)icmph);
585 #if IS_ENABLED(CONFIG_IPV6)
586 } else if (family == AF_INET6) {
587 pingv6_ops->ipv6_icmp_error(sk, skb, err, 0,
588 info, (u8 *)icmph);
589 #endif
590 }
591 }
592 sk->sk_err = err;
593 sk->sk_error_report(sk);
594 out:
595 sock_put(sk);
596 }
597 EXPORT_SYMBOL_GPL(ping_err);
598
599 /*
600 * Copy and checksum an ICMP Echo packet from user space into a buffer
601 * starting from the payload.
602 */
603
604 int ping_getfrag(void *from, char *to,
605 int offset, int fraglen, int odd, struct sk_buff *skb)
606 {
607 struct pingfakehdr *pfh = (struct pingfakehdr *)from;
608
609 if (offset == 0) {
610 if (fraglen < sizeof(struct icmphdr))
611 BUG();
612 if (csum_partial_copy_fromiovecend(to + sizeof(struct icmphdr),
613 pfh->iov, 0, fraglen - sizeof(struct icmphdr),
614 &pfh->wcheck))
615 return -EFAULT;
616 } else if (offset < sizeof(struct icmphdr)) {
617 BUG();
618 } else {
619 if (csum_partial_copy_fromiovecend
620 (to, pfh->iov, offset - sizeof(struct icmphdr),
621 fraglen, &pfh->wcheck))
622 return -EFAULT;
623 }
624
625 #if IS_ENABLED(CONFIG_IPV6)
626 /* For IPv6, checksum each skb as we go along, as expected by
627 * icmpv6_push_pending_frames. For IPv4, accumulate the checksum in
628 * wcheck, it will be finalized in ping_v4_push_pending_frames.
629 */
630 if (pfh->family == AF_INET6) {
631 skb->csum = pfh->wcheck;
632 skb->ip_summed = CHECKSUM_NONE;
633 pfh->wcheck = 0;
634 }
635 #endif
636
637 return 0;
638 }
639 EXPORT_SYMBOL_GPL(ping_getfrag);
640
641 static int ping_v4_push_pending_frames(struct sock *sk, struct pingfakehdr *pfh,
642 struct flowi4 *fl4)
643 {
644 struct sk_buff *skb = skb_peek(&sk->sk_write_queue);
645
646 pfh->wcheck = csum_partial((char *)&pfh->icmph,
647 sizeof(struct icmphdr), pfh->wcheck);
648 pfh->icmph.checksum = csum_fold(pfh->wcheck);
649 memcpy(icmp_hdr(skb), &pfh->icmph, sizeof(struct icmphdr));
650 skb->ip_summed = CHECKSUM_NONE;
651 return ip_push_pending_frames(sk, fl4);
652 }
653
654 int ping_common_sendmsg(int family, struct msghdr *msg, size_t len,
655 void *user_icmph, size_t icmph_len) {
656 u8 type, code;
657
658 if (len > 0xFFFF)
659 return -EMSGSIZE;
660
661 /*
662 * Check the flags.
663 */
664
665 /* Mirror BSD error message compatibility */
666 if (msg->msg_flags & MSG_OOB)
667 return -EOPNOTSUPP;
668
669 /*
670 * Fetch the ICMP header provided by the userland.
671 * iovec is modified! The ICMP header is consumed.
672 */
673 if (memcpy_from_msg(user_icmph, msg, icmph_len))
674 return -EFAULT;
675
676 if (family == AF_INET) {
677 type = ((struct icmphdr *) user_icmph)->type;
678 code = ((struct icmphdr *) user_icmph)->code;
679 #if IS_ENABLED(CONFIG_IPV6)
680 } else if (family == AF_INET6) {
681 type = ((struct icmp6hdr *) user_icmph)->icmp6_type;
682 code = ((struct icmp6hdr *) user_icmph)->icmp6_code;
683 #endif
684 } else {
685 BUG();
686 }
687
688 if (!ping_supported(family, type, code))
689 return -EINVAL;
690
691 return 0;
692 }
693 EXPORT_SYMBOL_GPL(ping_common_sendmsg);
694
695 static int ping_v4_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
696 size_t len)
697 {
698 struct net *net = sock_net(sk);
699 struct flowi4 fl4;
700 struct inet_sock *inet = inet_sk(sk);
701 struct ipcm_cookie ipc;
702 struct icmphdr user_icmph;
703 struct pingfakehdr pfh;
704 struct rtable *rt = NULL;
705 struct ip_options_data opt_copy;
706 int free = 0;
707 __be32 saddr, daddr, faddr;
708 u8 tos;
709 int err;
710
711 pr_debug("ping_v4_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num);
712
713 err = ping_common_sendmsg(AF_INET, msg, len, &user_icmph,
714 sizeof(user_icmph));
715 if (err)
716 return err;
717
718 /*
719 * Get and verify the address.
720 */
721
722 if (msg->msg_name) {
723 DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name);
724 if (msg->msg_namelen < sizeof(*usin))
725 return -EINVAL;
726 if (usin->sin_family != AF_INET)
727 return -EAFNOSUPPORT;
728 daddr = usin->sin_addr.s_addr;
729 /* no remote port */
730 } else {
731 if (sk->sk_state != TCP_ESTABLISHED)
732 return -EDESTADDRREQ;
733 daddr = inet->inet_daddr;
734 /* no remote port */
735 }
736
737 ipc.addr = inet->inet_saddr;
738 ipc.opt = NULL;
739 ipc.oif = sk->sk_bound_dev_if;
740 ipc.tx_flags = 0;
741 ipc.ttl = 0;
742 ipc.tos = -1;
743
744 sock_tx_timestamp(sk, &ipc.tx_flags);
745
746 if (msg->msg_controllen) {
747 err = ip_cmsg_send(sock_net(sk), msg, &ipc, false);
748 if (err)
749 return err;
750 if (ipc.opt)
751 free = 1;
752 }
753 if (!ipc.opt) {
754 struct ip_options_rcu *inet_opt;
755
756 rcu_read_lock();
757 inet_opt = rcu_dereference(inet->inet_opt);
758 if (inet_opt) {
759 memcpy(&opt_copy, inet_opt,
760 sizeof(*inet_opt) + inet_opt->opt.optlen);
761 ipc.opt = &opt_copy.opt;
762 }
763 rcu_read_unlock();
764 }
765
766 saddr = ipc.addr;
767 ipc.addr = faddr = daddr;
768
769 if (ipc.opt && ipc.opt->opt.srr) {
770 if (!daddr)
771 return -EINVAL;
772 faddr = ipc.opt->opt.faddr;
773 }
774 tos = get_rttos(&ipc, inet);
775 if (sock_flag(sk, SOCK_LOCALROUTE) ||
776 (msg->msg_flags & MSG_DONTROUTE) ||
777 (ipc.opt && ipc.opt->opt.is_strictroute)) {
778 tos |= RTO_ONLINK;
779 }
780
781 if (ipv4_is_multicast(daddr)) {
782 if (!ipc.oif)
783 ipc.oif = inet->mc_index;
784 if (!saddr)
785 saddr = inet->mc_addr;
786 } else if (!ipc.oif)
787 ipc.oif = inet->uc_index;
788
789 flowi4_init_output(&fl4, ipc.oif, sk->sk_mark, tos,
790 RT_SCOPE_UNIVERSE, sk->sk_protocol,
791 inet_sk_flowi_flags(sk), faddr, saddr, 0, 0);
792
793 security_sk_classify_flow(sk, flowi4_to_flowi(&fl4));
794 rt = ip_route_output_flow(net, &fl4, sk);
795 if (IS_ERR(rt)) {
796 err = PTR_ERR(rt);
797 rt = NULL;
798 if (err == -ENETUNREACH)
799 IP_INC_STATS(net, IPSTATS_MIB_OUTNOROUTES);
800 goto out;
801 }
802
803 err = -EACCES;
804 if ((rt->rt_flags & RTCF_BROADCAST) &&
805 !sock_flag(sk, SOCK_BROADCAST))
806 goto out;
807
808 if (msg->msg_flags & MSG_CONFIRM)
809 goto do_confirm;
810 back_from_confirm:
811
812 if (!ipc.addr)
813 ipc.addr = fl4.daddr;
814
815 lock_sock(sk);
816
817 pfh.icmph.type = user_icmph.type; /* already checked */
818 pfh.icmph.code = user_icmph.code; /* ditto */
819 pfh.icmph.checksum = 0;
820 pfh.icmph.un.echo.id = inet->inet_sport;
821 pfh.icmph.un.echo.sequence = user_icmph.un.echo.sequence;
822 /* XXX: stripping const */
823 pfh.iov = (struct iovec *)msg->msg_iter.iov;
824 pfh.wcheck = 0;
825 pfh.family = AF_INET;
826
827 err = ip_append_data(sk, &fl4, ping_getfrag, &pfh, len,
828 0, &ipc, &rt, msg->msg_flags);
829 if (err)
830 ip_flush_pending_frames(sk);
831 else
832 err = ping_v4_push_pending_frames(sk, &pfh, &fl4);
833 release_sock(sk);
834
835 out:
836 ip_rt_put(rt);
837 if (free)
838 kfree(ipc.opt);
839 if (!err) {
840 icmp_out_count(sock_net(sk), user_icmph.type);
841 return len;
842 }
843 return err;
844
845 do_confirm:
846 dst_confirm(&rt->dst);
847 if (!(msg->msg_flags & MSG_PROBE) || len)
848 goto back_from_confirm;
849 err = 0;
850 goto out;
851 }
852
853 int ping_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
854 size_t len, int noblock, int flags, int *addr_len)
855 {
856 struct inet_sock *isk = inet_sk(sk);
857 int family = sk->sk_family;
858 struct sk_buff *skb;
859 int copied, err;
860
861 pr_debug("ping_recvmsg(sk=%p,sk->num=%u)\n", isk, isk->inet_num);
862
863 err = -EOPNOTSUPP;
864 if (flags & MSG_OOB)
865 goto out;
866
867 if (flags & MSG_ERRQUEUE)
868 return inet_recv_error(sk, msg, len, addr_len);
869
870 skb = skb_recv_datagram(sk, flags, noblock, &err);
871 if (!skb)
872 goto out;
873
874 copied = skb->len;
875 if (copied > len) {
876 msg->msg_flags |= MSG_TRUNC;
877 copied = len;
878 }
879
880 /* Don't bother checking the checksum */
881 err = skb_copy_datagram_msg(skb, 0, msg, copied);
882 if (err)
883 goto done;
884
885 sock_recv_timestamp(msg, sk, skb);
886
887 /* Copy the address and add cmsg data. */
888 if (family == AF_INET) {
889 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
890
891 if (sin) {
892 sin->sin_family = AF_INET;
893 sin->sin_port = 0 /* skb->h.uh->source */;
894 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
895 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
896 *addr_len = sizeof(*sin);
897 }
898
899 if (isk->cmsg_flags)
900 ip_cmsg_recv(msg, skb);
901
902 #if IS_ENABLED(CONFIG_IPV6)
903 } else if (family == AF_INET6) {
904 struct ipv6_pinfo *np = inet6_sk(sk);
905 struct ipv6hdr *ip6 = ipv6_hdr(skb);
906 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
907
908 if (sin6) {
909 sin6->sin6_family = AF_INET6;
910 sin6->sin6_port = 0;
911 sin6->sin6_addr = ip6->saddr;
912 sin6->sin6_flowinfo = 0;
913 if (np->sndflow)
914 sin6->sin6_flowinfo = ip6_flowinfo(ip6);
915 sin6->sin6_scope_id =
916 ipv6_iface_scope_id(&sin6->sin6_addr,
917 inet6_iif(skb));
918 *addr_len = sizeof(*sin6);
919 }
920
921 if (inet6_sk(sk)->rxopt.all)
922 pingv6_ops->ip6_datagram_recv_common_ctl(sk, msg, skb);
923 if (skb->protocol == htons(ETH_P_IPV6) &&
924 inet6_sk(sk)->rxopt.all)
925 pingv6_ops->ip6_datagram_recv_specific_ctl(sk, msg, skb);
926 else if (skb->protocol == htons(ETH_P_IP) && isk->cmsg_flags)
927 ip_cmsg_recv(msg, skb);
928 #endif
929 } else {
930 BUG();
931 }
932
933 err = copied;
934
935 done:
936 skb_free_datagram(sk, skb);
937 out:
938 pr_debug("ping_recvmsg -> %d\n", err);
939 return err;
940 }
941 EXPORT_SYMBOL_GPL(ping_recvmsg);
942
943 int ping_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
944 {
945 pr_debug("ping_queue_rcv_skb(sk=%p,sk->num=%d,skb=%p)\n",
946 inet_sk(sk), inet_sk(sk)->inet_num, skb);
947 if (sock_queue_rcv_skb(sk, skb) < 0) {
948 kfree_skb(skb);
949 pr_debug("ping_queue_rcv_skb -> failed\n");
950 return -1;
951 }
952 return 0;
953 }
954 EXPORT_SYMBOL_GPL(ping_queue_rcv_skb);
955
956
957 /*
958 * All we need to do is get the socket.
959 */
960
961 bool ping_rcv(struct sk_buff *skb)
962 {
963 struct sock *sk;
964 struct net *net = dev_net(skb->dev);
965 struct icmphdr *icmph = icmp_hdr(skb);
966
967 /* We assume the packet has already been checked by icmp_rcv */
968
969 pr_debug("ping_rcv(skb=%p,id=%04x,seq=%04x)\n",
970 skb, ntohs(icmph->un.echo.id), ntohs(icmph->un.echo.sequence));
971
972 /* Push ICMP header back */
973 skb_push(skb, skb->data - (u8 *)icmph);
974
975 sk = ping_lookup(net, skb, ntohs(icmph->un.echo.id));
976 if (sk != NULL) {
977 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
978
979 pr_debug("rcv on socket %p\n", sk);
980 if (skb2)
981 ping_queue_rcv_skb(sk, skb2);
982 sock_put(sk);
983 return true;
984 }
985 pr_debug("no socket, dropping\n");
986
987 return false;
988 }
989 EXPORT_SYMBOL_GPL(ping_rcv);
990
991 struct proto ping_prot = {
992 .name = "PING",
993 .owner = THIS_MODULE,
994 .init = ping_init_sock,
995 .close = ping_close,
996 .connect = ip4_datagram_connect,
997 .disconnect = udp_disconnect,
998 .setsockopt = ip_setsockopt,
999 .getsockopt = ip_getsockopt,
1000 .sendmsg = ping_v4_sendmsg,
1001 .recvmsg = ping_recvmsg,
1002 .bind = ping_bind,
1003 .backlog_rcv = ping_queue_rcv_skb,
1004 .release_cb = ip4_datagram_release_cb,
1005 .hash = ping_hash,
1006 .unhash = ping_unhash,
1007 .get_port = ping_get_port,
1008 .obj_size = sizeof(struct inet_sock),
1009 };
1010 EXPORT_SYMBOL(ping_prot);
1011
1012 #ifdef CONFIG_PROC_FS
1013
1014 static struct sock *ping_get_first(struct seq_file *seq, int start)
1015 {
1016 struct sock *sk;
1017 struct ping_iter_state *state = seq->private;
1018 struct net *net = seq_file_net(seq);
1019
1020 for (state->bucket = start; state->bucket < PING_HTABLE_SIZE;
1021 ++state->bucket) {
1022 struct hlist_nulls_node *node;
1023 struct hlist_nulls_head *hslot;
1024
1025 hslot = &ping_table.hash[state->bucket];
1026
1027 if (hlist_nulls_empty(hslot))
1028 continue;
1029
1030 sk_nulls_for_each(sk, node, hslot) {
1031 if (net_eq(sock_net(sk), net) &&
1032 sk->sk_family == state->family)
1033 goto found;
1034 }
1035 }
1036 sk = NULL;
1037 found:
1038 return sk;
1039 }
1040
1041 static struct sock *ping_get_next(struct seq_file *seq, struct sock *sk)
1042 {
1043 struct ping_iter_state *state = seq->private;
1044 struct net *net = seq_file_net(seq);
1045
1046 do {
1047 sk = sk_nulls_next(sk);
1048 } while (sk && (!net_eq(sock_net(sk), net)));
1049
1050 if (!sk)
1051 return ping_get_first(seq, state->bucket + 1);
1052 return sk;
1053 }
1054
1055 static struct sock *ping_get_idx(struct seq_file *seq, loff_t pos)
1056 {
1057 struct sock *sk = ping_get_first(seq, 0);
1058
1059 if (sk)
1060 while (pos && (sk = ping_get_next(seq, sk)) != NULL)
1061 --pos;
1062 return pos ? NULL : sk;
1063 }
1064
1065 void *ping_seq_start(struct seq_file *seq, loff_t *pos, sa_family_t family)
1066 {
1067 struct ping_iter_state *state = seq->private;
1068 state->bucket = 0;
1069 state->family = family;
1070
1071 read_lock_bh(&ping_table.lock);
1072
1073 return *pos ? ping_get_idx(seq, *pos-1) : SEQ_START_TOKEN;
1074 }
1075 EXPORT_SYMBOL_GPL(ping_seq_start);
1076
1077 static void *ping_v4_seq_start(struct seq_file *seq, loff_t *pos)
1078 {
1079 return ping_seq_start(seq, pos, AF_INET);
1080 }
1081
1082 void *ping_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1083 {
1084 struct sock *sk;
1085
1086 if (v == SEQ_START_TOKEN)
1087 sk = ping_get_idx(seq, 0);
1088 else
1089 sk = ping_get_next(seq, v);
1090
1091 ++*pos;
1092 return sk;
1093 }
1094 EXPORT_SYMBOL_GPL(ping_seq_next);
1095
1096 void ping_seq_stop(struct seq_file *seq, void *v)
1097 {
1098 read_unlock_bh(&ping_table.lock);
1099 }
1100 EXPORT_SYMBOL_GPL(ping_seq_stop);
1101
1102 static void ping_v4_format_sock(struct sock *sp, struct seq_file *f,
1103 int bucket)
1104 {
1105 struct inet_sock *inet = inet_sk(sp);
1106 __be32 dest = inet->inet_daddr;
1107 __be32 src = inet->inet_rcv_saddr;
1108 __u16 destp = ntohs(inet->inet_dport);
1109 __u16 srcp = ntohs(inet->inet_sport);
1110
1111 seq_printf(f, "%5d: %08X:%04X %08X:%04X"
1112 " %02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d",
1113 bucket, src, srcp, dest, destp, sp->sk_state,
1114 sk_wmem_alloc_get(sp),
1115 sk_rmem_alloc_get(sp),
1116 0, 0L, 0,
1117 from_kuid_munged(seq_user_ns(f), sock_i_uid(sp)),
1118 0, sock_i_ino(sp),
1119 atomic_read(&sp->sk_refcnt), sp,
1120 atomic_read_unchecked(&sp->sk_drops));
1121 }
1122
1123 static int ping_v4_seq_show(struct seq_file *seq, void *v)
1124 {
1125 seq_setwidth(seq, 127);
1126 if (v == SEQ_START_TOKEN)
1127 seq_puts(seq, " sl local_address rem_address st tx_queue "
1128 "rx_queue tr tm->when retrnsmt uid timeout "
1129 "inode ref pointer drops");
1130 else {
1131 struct ping_iter_state *state = seq->private;
1132
1133 ping_v4_format_sock(v, seq, state->bucket);
1134 }
1135 seq_pad(seq, '\n');
1136 return 0;
1137 }
1138
1139 static const struct seq_operations ping_v4_seq_ops = {
1140 .show = ping_v4_seq_show,
1141 .start = ping_v4_seq_start,
1142 .next = ping_seq_next,
1143 .stop = ping_seq_stop,
1144 };
1145
1146 static int ping_seq_open(struct inode *inode, struct file *file)
1147 {
1148 struct ping_seq_afinfo *afinfo = PDE_DATA(inode);
1149 return seq_open_net(inode, file, &afinfo->seq_ops,
1150 sizeof(struct ping_iter_state));
1151 }
1152
1153 const struct file_operations ping_seq_fops = {
1154 .open = ping_seq_open,
1155 .read = seq_read,
1156 .llseek = seq_lseek,
1157 .release = seq_release_net,
1158 };
1159 EXPORT_SYMBOL_GPL(ping_seq_fops);
1160
1161 static struct ping_seq_afinfo ping_v4_seq_afinfo = {
1162 .name = "icmp",
1163 .family = AF_INET,
1164 .seq_fops = &ping_seq_fops,
1165 .seq_ops = {
1166 .start = ping_v4_seq_start,
1167 .show = ping_v4_seq_show,
1168 .next = ping_seq_next,
1169 .stop = ping_seq_stop,
1170 },
1171 };
1172
1173 int ping_proc_register(struct net *net, struct ping_seq_afinfo *afinfo)
1174 {
1175 struct proc_dir_entry *p;
1176 p = proc_create_data(afinfo->name, S_IRUGO, net->proc_net,
1177 afinfo->seq_fops, afinfo);
1178 if (!p)
1179 return -ENOMEM;
1180 return 0;
1181 }
1182 EXPORT_SYMBOL_GPL(ping_proc_register);
1183
1184 void ping_proc_unregister(struct net *net, struct ping_seq_afinfo *afinfo)
1185 {
1186 remove_proc_entry(afinfo->name, net->proc_net);
1187 }
1188 EXPORT_SYMBOL_GPL(ping_proc_unregister);
1189
1190 static int __net_init ping_v4_proc_init_net(struct net *net)
1191 {
1192 return ping_proc_register(net, &ping_v4_seq_afinfo);
1193 }
1194
1195 static void __net_exit ping_v4_proc_exit_net(struct net *net)
1196 {
1197 ping_proc_unregister(net, &ping_v4_seq_afinfo);
1198 }
1199
1200 static struct pernet_operations ping_v4_net_ops = {
1201 .init = ping_v4_proc_init_net,
1202 .exit = ping_v4_proc_exit_net,
1203 };
1204
1205 int __init ping_proc_init(void)
1206 {
1207 return register_pernet_subsys(&ping_v4_net_ops);
1208 }
1209
1210 void ping_proc_exit(void)
1211 {
1212 unregister_pernet_subsys(&ping_v4_net_ops);
1213 }
1214
1215 #endif
1216
1217 void __init ping_init(void)
1218 {
1219 int i;
1220
1221 for (i = 0; i < PING_HTABLE_SIZE; i++)
1222 INIT_HLIST_NULLS_HEAD(&ping_table.hash[i], i);
1223 rwlock_init(&ping_table.lock);
1224 }
Michael's Linux tree.