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gianfar: constify giant block of status descriptor strings
[linux-2.6.git] / net / ipv4 / ping.c
blobab6b36e6da153638714c8a716e23a9832b432f49
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 <asm/system.h>
24 #include <linux/uaccess.h>
25 #include <linux/types.h>
26 #include <linux/fcntl.h>
27 #include <linux/socket.h>
28 #include <linux/sockios.h>
29 #include <linux/in.h>
30 #include <linux/errno.h>
31 #include <linux/timer.h>
32 #include <linux/mm.h>
33 #include <linux/inet.h>
34 #include <linux/netdevice.h>
35 #include <net/snmp.h>
36 #include <net/ip.h>
37 #include <net/ipv6.h>
38 #include <net/icmp.h>
39 #include <net/protocol.h>
40 #include <linux/skbuff.h>
41 #include <linux/proc_fs.h>
42 #include <linux/export.h>
43 #include <net/sock.h>
44 #include <net/ping.h>
45 #include <net/udp.h>
46 #include <net/route.h>
47 #include <net/inet_common.h>
48 #include <net/checksum.h>
49
50
51 static struct ping_table ping_table;
52
53 static u16 ping_port_rover;
54
55 static inline int ping_hashfn(struct net *net, unsigned num, unsigned mask)
56 {
57 int res = (num + net_hash_mix(net)) & mask;
58 pr_debug("hash(%d) = %d\n", num, res);
59 return res;
60 }
61
62 static inline struct hlist_nulls_head *ping_hashslot(struct ping_table *table,
63 struct net *net, unsigned num)
64 {
65 return &table->hash[ping_hashfn(net, num, PING_HTABLE_MASK)];
66 }
67
68 static int ping_v4_get_port(struct sock *sk, unsigned short ident)
69 {
70 struct hlist_nulls_node *node;
71 struct hlist_nulls_head *hlist;
72 struct inet_sock *isk, *isk2;
73 struct sock *sk2 = NULL;
74
75 isk = inet_sk(sk);
76 write_lock_bh(&ping_table.lock);
77 if (ident == 0) {
78 u32 i;
79 u16 result = ping_port_rover + 1;
80
81 for (i = 0; i < (1L << 16); i++, result++) {
82 if (!result)
83 result++; /* avoid zero */
84 hlist = ping_hashslot(&ping_table, sock_net(sk),
85 result);
86 ping_portaddr_for_each_entry(sk2, node, hlist) {
87 isk2 = inet_sk(sk2);
88
89 if (isk2->inet_num == result)
90 goto next_port;
91 }
92
93 /* found */
94 ping_port_rover = ident = result;
95 break;
96 next_port:
97 ;
98 }
99 if (i >= (1L << 16))
100 goto fail;
101 } else {
102 hlist = ping_hashslot(&ping_table, sock_net(sk), ident);
103 ping_portaddr_for_each_entry(sk2, node, hlist) {
104 isk2 = inet_sk(sk2);
105
106 if ((isk2->inet_num == ident) &&
107 (sk2 != sk) &&
108 (!sk2->sk_reuse || !sk->sk_reuse))
109 goto fail;
110 }
111 }
112
113 pr_debug("found port/ident = %d\n", ident);
114 isk->inet_num = ident;
115 if (sk_unhashed(sk)) {
116 pr_debug("was not hashed\n");
117 sock_hold(sk);
118 hlist_nulls_add_head(&sk->sk_nulls_node, hlist);
119 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
120 }
121 write_unlock_bh(&ping_table.lock);
122 return 0;
123
124 fail:
125 write_unlock_bh(&ping_table.lock);
126 return 1;
127 }
128
129 static void ping_v4_hash(struct sock *sk)
130 {
131 pr_debug("ping_v4_hash(sk->port=%u)\n", inet_sk(sk)->inet_num);
132 BUG(); /* "Please do not press this button again." */
133 }
134
135 static void ping_v4_unhash(struct sock *sk)
136 {
137 struct inet_sock *isk = inet_sk(sk);
138 pr_debug("ping_v4_unhash(isk=%p,isk->num=%u)\n", isk, isk->inet_num);
139 if (sk_hashed(sk)) {
140 write_lock_bh(&ping_table.lock);
141 hlist_nulls_del(&sk->sk_nulls_node);
142 sock_put(sk);
143 isk->inet_num = 0;
144 isk->inet_sport = 0;
145 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
146 write_unlock_bh(&ping_table.lock);
147 }
148 }
149
150 static struct sock *ping_v4_lookup(struct net *net, __be32 saddr, __be32 daddr,
151 u16 ident, int dif)
152 {
153 struct hlist_nulls_head *hslot = ping_hashslot(&ping_table, net, ident);
154 struct sock *sk = NULL;
155 struct inet_sock *isk;
156 struct hlist_nulls_node *hnode;
157
158 pr_debug("try to find: num = %d, daddr = %pI4, dif = %d\n",
159 (int)ident, &daddr, dif);
160 read_lock_bh(&ping_table.lock);
161
162 ping_portaddr_for_each_entry(sk, hnode, hslot) {
163 isk = inet_sk(sk);
164
165 pr_debug("found: %p: num = %d, daddr = %pI4, dif = %d\n", sk,
166 (int)isk->inet_num, &isk->inet_rcv_saddr,
167 sk->sk_bound_dev_if);
168
169 pr_debug("iterate\n");
170 if (isk->inet_num != ident)
171 continue;
172 if (isk->inet_rcv_saddr && isk->inet_rcv_saddr != daddr)
173 continue;
174 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)
175 continue;
176
177 sock_hold(sk);
178 goto exit;
179 }
180
181 sk = NULL;
182 exit:
183 read_unlock_bh(&ping_table.lock);
184
185 return sk;
186 }
187
188 static void inet_get_ping_group_range_net(struct net *net, gid_t *low,
189 gid_t *high)
190 {
191 gid_t *data = net->ipv4.sysctl_ping_group_range;
192 unsigned seq;
193 do {
194 seq = read_seqbegin(&sysctl_local_ports.lock);
195
196 *low = data[0];
197 *high = data[1];
198 } while (read_seqretry(&sysctl_local_ports.lock, seq));
199 }
200
201
202 static int ping_init_sock(struct sock *sk)
203 {
204 struct net *net = sock_net(sk);
205 gid_t group = current_egid();
206 gid_t range[2];
207 struct group_info *group_info = get_current_groups();
208 int i, j, count = group_info->ngroups;
209
210 inet_get_ping_group_range_net(net, range, range+1);
211 if (range[0] <= group && group <= range[1])
212 return 0;
213
214 for (i = 0; i < group_info->nblocks; i++) {
215 int cp_count = min_t(int, NGROUPS_PER_BLOCK, count);
216
217 for (j = 0; j < cp_count; j++) {
218 group = group_info->blocks[i][j];
219 if (range[0] <= group && group <= range[1])
220 return 0;
221 }
222
223 count -= cp_count;
224 }
225
226 return -EACCES;
227 }
228
229 static void ping_close(struct sock *sk, long timeout)
230 {
231 pr_debug("ping_close(sk=%p,sk->num=%u)\n",
232 inet_sk(sk), inet_sk(sk)->inet_num);
233 pr_debug("isk->refcnt = %d\n", sk->sk_refcnt.counter);
234
235 sk_common_release(sk);
236 }
237
238 /*
239 * We need our own bind because there are no privileged id's == local ports.
240 * Moreover, we don't allow binding to multi- and broadcast addresses.
241 */
242
243 static int ping_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
244 {
245 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
246 struct inet_sock *isk = inet_sk(sk);
247 unsigned short snum;
248 int chk_addr_ret;
249 int err;
250
251 if (addr_len < sizeof(struct sockaddr_in))
252 return -EINVAL;
253
254 pr_debug("ping_v4_bind(sk=%p,sa_addr=%08x,sa_port=%d)\n",
255 sk, addr->sin_addr.s_addr, ntohs(addr->sin_port));
256
257 chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr);
258 if (addr->sin_addr.s_addr == htonl(INADDR_ANY))
259 chk_addr_ret = RTN_LOCAL;
260
261 if ((sysctl_ip_nonlocal_bind == 0 &&
262 isk->freebind == 0 && isk->transparent == 0 &&
263 chk_addr_ret != RTN_LOCAL) ||
264 chk_addr_ret == RTN_MULTICAST ||
265 chk_addr_ret == RTN_BROADCAST)
266 return -EADDRNOTAVAIL;
267
268 lock_sock(sk);
269
270 err = -EINVAL;
271 if (isk->inet_num != 0)
272 goto out;
273
274 err = -EADDRINUSE;
275 isk->inet_rcv_saddr = isk->inet_saddr = addr->sin_addr.s_addr;
276 snum = ntohs(addr->sin_port);
277 if (ping_v4_get_port(sk, snum) != 0) {
278 isk->inet_saddr = isk->inet_rcv_saddr = 0;
279 goto out;
280 }
281
282 pr_debug("after bind(): num = %d, daddr = %pI4, dif = %d\n",
283 (int)isk->inet_num,
284 &isk->inet_rcv_saddr,
285 (int)sk->sk_bound_dev_if);
286
287 err = 0;
288 if (isk->inet_rcv_saddr)
289 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
290 if (snum)
291 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
292 isk->inet_sport = htons(isk->inet_num);
293 isk->inet_daddr = 0;
294 isk->inet_dport = 0;
295 sk_dst_reset(sk);
296 out:
297 release_sock(sk);
298 pr_debug("ping_v4_bind -> %d\n", err);
299 return err;
300 }
301
302 /*
303 * Is this a supported type of ICMP message?
304 */
305
306 static inline int ping_supported(int type, int code)
307 {
308 if (type == ICMP_ECHO && code == 0)
309 return 1;
310 return 0;
311 }
312
313 /*
314 * This routine is called by the ICMP module when it gets some
315 * sort of error condition.
316 */
317
318 static int ping_queue_rcv_skb(struct sock *sk, struct sk_buff *skb);
319
320 void ping_err(struct sk_buff *skb, u32 info)
321 {
322 struct iphdr *iph = (struct iphdr *)skb->data;
323 struct icmphdr *icmph = (struct icmphdr *)(skb->data+(iph->ihl<<2));
324 struct inet_sock *inet_sock;
325 int type = icmph->type;
326 int code = icmph->code;
327 struct net *net = dev_net(skb->dev);
328 struct sock *sk;
329 int harderr;
330 int err;
331
332 /* We assume the packet has already been checked by icmp_unreach */
333
334 if (!ping_supported(icmph->type, icmph->code))
335 return;
336
337 pr_debug("ping_err(type=%04x,code=%04x,id=%04x,seq=%04x)\n", type,
338 code, ntohs(icmph->un.echo.id), ntohs(icmph->un.echo.sequence));
339
340 sk = ping_v4_lookup(net, iph->daddr, iph->saddr,
341 ntohs(icmph->un.echo.id), skb->dev->ifindex);
342 if (sk == NULL) {
343 pr_debug("no socket, dropping\n");
344 return; /* No socket for error */
345 }
346 pr_debug("err on socket %p\n", sk);
347
348 err = 0;
349 harderr = 0;
350 inet_sock = inet_sk(sk);
351
352 switch (type) {
353 default:
354 case ICMP_TIME_EXCEEDED:
355 err = EHOSTUNREACH;
356 break;
357 case ICMP_SOURCE_QUENCH:
358 /* This is not a real error but ping wants to see it.
359 * Report it with some fake errno. */
360 err = EREMOTEIO;
361 break;
362 case ICMP_PARAMETERPROB:
363 err = EPROTO;
364 harderr = 1;
365 break;
366 case ICMP_DEST_UNREACH:
367 if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */
368 if (inet_sock->pmtudisc != IP_PMTUDISC_DONT) {
369 err = EMSGSIZE;
370 harderr = 1;
371 break;
372 }
373 goto out;
374 }
375 err = EHOSTUNREACH;
376 if (code <= NR_ICMP_UNREACH) {
377 harderr = icmp_err_convert[code].fatal;
378 err = icmp_err_convert[code].errno;
379 }
380 break;
381 case ICMP_REDIRECT:
382 /* See ICMP_SOURCE_QUENCH */
383 err = EREMOTEIO;
384 break;
385 }
386
387 /*
388 * RFC1122: OK. Passes ICMP errors back to application, as per
389 * 4.1.3.3.
390 */
391 if (!inet_sock->recverr) {
392 if (!harderr || sk->sk_state != TCP_ESTABLISHED)
393 goto out;
394 } else {
395 ip_icmp_error(sk, skb, err, 0 /* no remote port */,
396 info, (u8 *)icmph);
397 }
398 sk->sk_err = err;
399 sk->sk_error_report(sk);
400 out:
401 sock_put(sk);
402 }
403
404 /*
405 * Copy and checksum an ICMP Echo packet from user space into a buffer.
406 */
407
408 struct pingfakehdr {
409 struct icmphdr icmph;
410 struct iovec *iov;
411 __wsum wcheck;
412 };
413
414 static int ping_getfrag(void *from, char * to,
415 int offset, int fraglen, int odd, struct sk_buff *skb)
416 {
417 struct pingfakehdr *pfh = (struct pingfakehdr *)from;
418
419 if (offset == 0) {
420 if (fraglen < sizeof(struct icmphdr))
421 BUG();
422 if (csum_partial_copy_fromiovecend(to + sizeof(struct icmphdr),
423 pfh->iov, 0, fraglen - sizeof(struct icmphdr),
424 &pfh->wcheck))
425 return -EFAULT;
426
427 return 0;
428 }
429 if (offset < sizeof(struct icmphdr))
430 BUG();
431 if (csum_partial_copy_fromiovecend
432 (to, pfh->iov, offset - sizeof(struct icmphdr),
433 fraglen, &pfh->wcheck))
434 return -EFAULT;
435 return 0;
436 }
437
438 static int ping_push_pending_frames(struct sock *sk, struct pingfakehdr *pfh,
439 struct flowi4 *fl4)
440 {
441 struct sk_buff *skb = skb_peek(&sk->sk_write_queue);
442
443 pfh->wcheck = csum_partial((char *)&pfh->icmph,
444 sizeof(struct icmphdr), pfh->wcheck);
445 pfh->icmph.checksum = csum_fold(pfh->wcheck);
446 memcpy(icmp_hdr(skb), &pfh->icmph, sizeof(struct icmphdr));
447 skb->ip_summed = CHECKSUM_NONE;
448 return ip_push_pending_frames(sk, fl4);
449 }
450
451 static int ping_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
452 size_t len)
453 {
454 struct net *net = sock_net(sk);
455 struct flowi4 fl4;
456 struct inet_sock *inet = inet_sk(sk);
457 struct ipcm_cookie ipc;
458 struct icmphdr user_icmph;
459 struct pingfakehdr pfh;
460 struct rtable *rt = NULL;
461 struct ip_options_data opt_copy;
462 int free = 0;
463 __be32 saddr, daddr, faddr;
464 u8 tos;
465 int err;
466
467 pr_debug("ping_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num);
468
469
470 if (len > 0xFFFF)
471 return -EMSGSIZE;
472
473 /*
474 * Check the flags.
475 */
476
477 /* Mirror BSD error message compatibility */
478 if (msg->msg_flags & MSG_OOB)
479 return -EOPNOTSUPP;
480
481 /*
482 * Fetch the ICMP header provided by the userland.
483 * iovec is modified!
484 */
485
486 if (memcpy_fromiovec((u8 *)&user_icmph, msg->msg_iov,
487 sizeof(struct icmphdr)))
488 return -EFAULT;
489 if (!ping_supported(user_icmph.type, user_icmph.code))
490 return -EINVAL;
491
492 /*
493 * Get and verify the address.
494 */
495
496 if (msg->msg_name) {
497 struct sockaddr_in *usin = (struct sockaddr_in *)msg->msg_name;
498 if (msg->msg_namelen < sizeof(*usin))
499 return -EINVAL;
500 if (usin->sin_family != AF_INET)
501 return -EINVAL;
502 daddr = usin->sin_addr.s_addr;
503 /* no remote port */
504 } else {
505 if (sk->sk_state != TCP_ESTABLISHED)
506 return -EDESTADDRREQ;
507 daddr = inet->inet_daddr;
508 /* no remote port */
509 }
510
511 ipc.addr = inet->inet_saddr;
512 ipc.opt = NULL;
513 ipc.oif = sk->sk_bound_dev_if;
514 ipc.tx_flags = 0;
515 err = sock_tx_timestamp(sk, &ipc.tx_flags);
516 if (err)
517 return err;
518
519 if (msg->msg_controllen) {
520 err = ip_cmsg_send(sock_net(sk), msg, &ipc);
521 if (err)
522 return err;
523 if (ipc.opt)
524 free = 1;
525 }
526 if (!ipc.opt) {
527 struct ip_options_rcu *inet_opt;
528
529 rcu_read_lock();
530 inet_opt = rcu_dereference(inet->inet_opt);
531 if (inet_opt) {
532 memcpy(&opt_copy, inet_opt,
533 sizeof(*inet_opt) + inet_opt->opt.optlen);
534 ipc.opt = &opt_copy.opt;
535 }
536 rcu_read_unlock();
537 }
538
539 saddr = ipc.addr;
540 ipc.addr = faddr = daddr;
541
542 if (ipc.opt && ipc.opt->opt.srr) {
543 if (!daddr)
544 return -EINVAL;
545 faddr = ipc.opt->opt.faddr;
546 }
547 tos = RT_TOS(inet->tos);
548 if (sock_flag(sk, SOCK_LOCALROUTE) ||
549 (msg->msg_flags & MSG_DONTROUTE) ||
550 (ipc.opt && ipc.opt->opt.is_strictroute)) {
551 tos |= RTO_ONLINK;
552 }
553
554 if (ipv4_is_multicast(daddr)) {
555 if (!ipc.oif)
556 ipc.oif = inet->mc_index;
557 if (!saddr)
558 saddr = inet->mc_addr;
559 } else if (!ipc.oif)
560 ipc.oif = inet->uc_index;
561
562 flowi4_init_output(&fl4, ipc.oif, sk->sk_mark, tos,
563 RT_SCOPE_UNIVERSE, sk->sk_protocol,
564 inet_sk_flowi_flags(sk), faddr, saddr, 0, 0);
565
566 security_sk_classify_flow(sk, flowi4_to_flowi(&fl4));
567 rt = ip_route_output_flow(net, &fl4, sk);
568 if (IS_ERR(rt)) {
569 err = PTR_ERR(rt);
570 rt = NULL;
571 if (err == -ENETUNREACH)
572 IP_INC_STATS_BH(net, IPSTATS_MIB_OUTNOROUTES);
573 goto out;
574 }
575
576 err = -EACCES;
577 if ((rt->rt_flags & RTCF_BROADCAST) &&
578 !sock_flag(sk, SOCK_BROADCAST))
579 goto out;
580
581 if (msg->msg_flags & MSG_CONFIRM)
582 goto do_confirm;
583 back_from_confirm:
584
585 if (!ipc.addr)
586 ipc.addr = fl4.daddr;
587
588 lock_sock(sk);
589
590 pfh.icmph.type = user_icmph.type; /* already checked */
591 pfh.icmph.code = user_icmph.code; /* ditto */
592 pfh.icmph.checksum = 0;
593 pfh.icmph.un.echo.id = inet->inet_sport;
594 pfh.icmph.un.echo.sequence = user_icmph.un.echo.sequence;
595 pfh.iov = msg->msg_iov;
596 pfh.wcheck = 0;
597
598 err = ip_append_data(sk, &fl4, ping_getfrag, &pfh, len,
599 0, &ipc, &rt, msg->msg_flags);
600 if (err)
601 ip_flush_pending_frames(sk);
602 else
603 err = ping_push_pending_frames(sk, &pfh, &fl4);
604 release_sock(sk);
605
606 out:
607 ip_rt_put(rt);
608 if (free)
609 kfree(ipc.opt);
610 if (!err) {
611 icmp_out_count(sock_net(sk), user_icmph.type);
612 return len;
613 }
614 return err;
615
616 do_confirm:
617 dst_confirm(&rt->dst);
618 if (!(msg->msg_flags & MSG_PROBE) || len)
619 goto back_from_confirm;
620 err = 0;
621 goto out;
622 }
623
624 static int ping_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
625 size_t len, int noblock, int flags, int *addr_len)
626 {
627 struct inet_sock *isk = inet_sk(sk);
628 struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name;
629 struct sk_buff *skb;
630 int copied, err;
631
632 pr_debug("ping_recvmsg(sk=%p,sk->num=%u)\n", isk, isk->inet_num);
633
634 err = -EOPNOTSUPP;
635 if (flags & MSG_OOB)
636 goto out;
637
638 if (addr_len)
639 *addr_len = sizeof(*sin);
640
641 if (flags & MSG_ERRQUEUE)
642 return ip_recv_error(sk, msg, len);
643
644 skb = skb_recv_datagram(sk, flags, noblock, &err);
645 if (!skb)
646 goto out;
647
648 copied = skb->len;
649 if (copied > len) {
650 msg->msg_flags |= MSG_TRUNC;
651 copied = len;
652 }
653
654 /* Don't bother checking the checksum */
655 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
656 if (err)
657 goto done;
658
659 sock_recv_timestamp(msg, sk, skb);
660
661 /* Copy the address. */
662 if (sin) {
663 sin->sin_family = AF_INET;
664 sin->sin_port = 0 /* skb->h.uh->source */;
665 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
666 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
667 }
668 if (isk->cmsg_flags)
669 ip_cmsg_recv(msg, skb);
670 err = copied;
671
672 done:
673 skb_free_datagram(sk, skb);
674 out:
675 pr_debug("ping_recvmsg -> %d\n", err);
676 return err;
677 }
678
679 static int ping_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
680 {
681 pr_debug("ping_queue_rcv_skb(sk=%p,sk->num=%d,skb=%p)\n",
682 inet_sk(sk), inet_sk(sk)->inet_num, skb);
683 if (sock_queue_rcv_skb(sk, skb) < 0) {
684 kfree_skb(skb);
685 pr_debug("ping_queue_rcv_skb -> failed\n");
686 return -1;
687 }
688 return 0;
689 }
690
691
692 /*
693 * All we need to do is get the socket.
694 */
695
696 void ping_rcv(struct sk_buff *skb)
697 {
698 struct sock *sk;
699 struct net *net = dev_net(skb->dev);
700 struct iphdr *iph = ip_hdr(skb);
701 struct icmphdr *icmph = icmp_hdr(skb);
702 __be32 saddr = iph->saddr;
703 __be32 daddr = iph->daddr;
704
705 /* We assume the packet has already been checked by icmp_rcv */
706
707 pr_debug("ping_rcv(skb=%p,id=%04x,seq=%04x)\n",
708 skb, ntohs(icmph->un.echo.id), ntohs(icmph->un.echo.sequence));
709
710 /* Push ICMP header back */
711 skb_push(skb, skb->data - (u8 *)icmph);
712
713 sk = ping_v4_lookup(net, saddr, daddr, ntohs(icmph->un.echo.id),
714 skb->dev->ifindex);
715 if (sk != NULL) {
716 pr_debug("rcv on socket %p\n", sk);
717 ping_queue_rcv_skb(sk, skb_get(skb));
718 sock_put(sk);
719 return;
720 }
721 pr_debug("no socket, dropping\n");
722
723 /* We're called from icmp_rcv(). kfree_skb() is done there. */
724 }
725
726 struct proto ping_prot = {
727 .name = "PING",
728 .owner = THIS_MODULE,
729 .init = ping_init_sock,
730 .close = ping_close,
731 .connect = ip4_datagram_connect,
732 .disconnect = udp_disconnect,
733 .setsockopt = ip_setsockopt,
734 .getsockopt = ip_getsockopt,
735 .sendmsg = ping_sendmsg,
736 .recvmsg = ping_recvmsg,
737 .bind = ping_bind,
738 .backlog_rcv = ping_queue_rcv_skb,
739 .hash = ping_v4_hash,
740 .unhash = ping_v4_unhash,
741 .get_port = ping_v4_get_port,
742 .obj_size = sizeof(struct inet_sock),
743 };
744 EXPORT_SYMBOL(ping_prot);
745
746 #ifdef CONFIG_PROC_FS
747
748 static struct sock *ping_get_first(struct seq_file *seq, int start)
749 {
750 struct sock *sk;
751 struct ping_iter_state *state = seq->private;
752 struct net *net = seq_file_net(seq);
753
754 for (state->bucket = start; state->bucket < PING_HTABLE_SIZE;
755 ++state->bucket) {
756 struct hlist_nulls_node *node;
757 struct hlist_nulls_head *hslot;
758
759 hslot = &ping_table.hash[state->bucket];
760
761 if (hlist_nulls_empty(hslot))
762 continue;
763
764 sk_nulls_for_each(sk, node, hslot) {
765 if (net_eq(sock_net(sk), net))
766 goto found;
767 }
768 }
769 sk = NULL;
770 found:
771 return sk;
772 }
773
774 static struct sock *ping_get_next(struct seq_file *seq, struct sock *sk)
775 {
776 struct ping_iter_state *state = seq->private;
777 struct net *net = seq_file_net(seq);
778
779 do {
780 sk = sk_nulls_next(sk);
781 } while (sk && (!net_eq(sock_net(sk), net)));
782
783 if (!sk)
784 return ping_get_first(seq, state->bucket + 1);
785 return sk;
786 }
787
788 static struct sock *ping_get_idx(struct seq_file *seq, loff_t pos)
789 {
790 struct sock *sk = ping_get_first(seq, 0);
791
792 if (sk)
793 while (pos && (sk = ping_get_next(seq, sk)) != NULL)
794 --pos;
795 return pos ? NULL : sk;
796 }
797
798 static void *ping_seq_start(struct seq_file *seq, loff_t *pos)
799 {
800 struct ping_iter_state *state = seq->private;
801 state->bucket = 0;
802
803 read_lock_bh(&ping_table.lock);
804
805 return *pos ? ping_get_idx(seq, *pos-1) : SEQ_START_TOKEN;
806 }
807
808 static void *ping_seq_next(struct seq_file *seq, void *v, loff_t *pos)
809 {
810 struct sock *sk;
811
812 if (v == SEQ_START_TOKEN)
813 sk = ping_get_idx(seq, 0);
814 else
815 sk = ping_get_next(seq, v);
816
817 ++*pos;
818 return sk;
819 }
820
821 static void ping_seq_stop(struct seq_file *seq, void *v)
822 {
823 read_unlock_bh(&ping_table.lock);
824 }
825
826 static void ping_format_sock(struct sock *sp, struct seq_file *f,
827 int bucket, int *len)
828 {
829 struct inet_sock *inet = inet_sk(sp);
830 __be32 dest = inet->inet_daddr;
831 __be32 src = inet->inet_rcv_saddr;
832 __u16 destp = ntohs(inet->inet_dport);
833 __u16 srcp = ntohs(inet->inet_sport);
834
835 seq_printf(f, "%5d: %08X:%04X %08X:%04X"
836 " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %d%n",
837 bucket, src, srcp, dest, destp, sp->sk_state,
838 sk_wmem_alloc_get(sp),
839 sk_rmem_alloc_get(sp),
840 0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp),
841 atomic_read(&sp->sk_refcnt), sp,
842 atomic_read(&sp->sk_drops), len);
843 }
844
845 static int ping_seq_show(struct seq_file *seq, void *v)
846 {
847 if (v == SEQ_START_TOKEN)
848 seq_printf(seq, "%-127s\n",
849 " sl local_address rem_address st tx_queue "
850 "rx_queue tr tm->when retrnsmt uid timeout "
851 "inode ref pointer drops");
852 else {
853 struct ping_iter_state *state = seq->private;
854 int len;
855
856 ping_format_sock(v, seq, state->bucket, &len);
857 seq_printf(seq, "%*s\n", 127 - len, "");
858 }
859 return 0;
860 }
861
862 static const struct seq_operations ping_seq_ops = {
863 .show = ping_seq_show,
864 .start = ping_seq_start,
865 .next = ping_seq_next,
866 .stop = ping_seq_stop,
867 };
868
869 static int ping_seq_open(struct inode *inode, struct file *file)
870 {
871 return seq_open_net(inode, file, &ping_seq_ops,
872 sizeof(struct ping_iter_state));
873 }
874
875 static const struct file_operations ping_seq_fops = {
876 .open = ping_seq_open,
877 .read = seq_read,
878 .llseek = seq_lseek,
879 .release = seq_release_net,
880 };
881
882 static int ping_proc_register(struct net *net)
883 {
884 struct proc_dir_entry *p;
885 int rc = 0;
886
887 p = proc_net_fops_create(net, "icmp", S_IRUGO, &ping_seq_fops);
888 if (!p)
889 rc = -ENOMEM;
890 return rc;
891 }
892
893 static void ping_proc_unregister(struct net *net)
894 {
895 proc_net_remove(net, "icmp");
896 }
897
898
899 static int __net_init ping_proc_init_net(struct net *net)
900 {
901 return ping_proc_register(net);
902 }
903
904 static void __net_exit ping_proc_exit_net(struct net *net)
905 {
906 ping_proc_unregister(net);
907 }
908
909 static struct pernet_operations ping_net_ops = {
910 .init = ping_proc_init_net,
911 .exit = ping_proc_exit_net,
912 };
913
914 int __init ping_proc_init(void)
915 {
916 return register_pernet_subsys(&ping_net_ops);
917 }
918
919 void ping_proc_exit(void)
920 {
921 unregister_pernet_subsys(&ping_net_ops);
922 }
923
924 #endif
925
926 void __init ping_init(void)
927 {
928 int i;
929
930 for (i = 0; i < PING_HTABLE_SIZE; i++)
931 INIT_HLIST_NULLS_HEAD(&ping_table.hash[i], i);
932 rwlock_init(&ping_table.lock);
933 }
Linus' kernel tree