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bluetooth: Fix warnings in l2cap_core.c
[linux-2.6-block.git] / net / ipv4 / ping.c
CommitLineData
c319b4d7
VK		 1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * "Ping" sockets
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
12 *
13 * Based on ipv4/udp.c code.
14 *
15 * Authors: Vasiliy Kulikov / Openwall (for Linux 2.6),
16 * Pavel Kankovsky (for Linux 2.4.32)
17 *
18 * Pavel gave all rights to bugs to Vasiliy,
19 * none of the bugs are Pavel's now.
20 *
21 */
22
23#include <asm/system.h>
24#include <linux/uaccess.h>
c319b4d7
VK		 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 <net/sock.h>
43#include <net/ping.h>
44#include <net/icmp.h>
45#include <net/udp.h>
46#include <net/route.h>
47#include <net/inet_common.h>
48#include <net/checksum.h>
49
50
1b1cb1f7 51static struct ping_table ping_table;
c319b4d7 52
1b1cb1f7 53static u16 ping_port_rover;
c319b4d7
VK		 54
55static 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
62static 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
68static 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;
96next_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
124fail:
125 write_unlock_bh(&ping_table.lock);
126 return 1;
127}
128
129static 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
135static 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 struct hlist_nulls_head *hslot;
141
142 hslot = ping_hashslot(&ping_table, sock_net(sk), isk->inet_num);
143 write_lock_bh(&ping_table.lock);
144 hlist_nulls_del(&sk->sk_nulls_node);
145 sock_put(sk);
146 isk->inet_num = isk->inet_sport = 0;
147 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
148 write_unlock_bh(&ping_table.lock);
149 }
150}
151
1b1cb1f7
ED		 152static struct sock *ping_v4_lookup(struct net *net, u32 saddr, u32 daddr,
153 u16 ident, int dif)
c319b4d7
VK		 154{
155 struct hlist_nulls_head *hslot = ping_hashslot(&ping_table, net, ident);
156 struct sock *sk = NULL;
157 struct inet_sock *isk;
158 struct hlist_nulls_node *hnode;
159
160 pr_debug("try to find: num = %d, daddr = %ld, dif = %d\n",
161 (int)ident, (unsigned long)daddr, dif);
162 read_lock_bh(&ping_table.lock);
163
164 ping_portaddr_for_each_entry(sk, hnode, hslot) {
165 isk = inet_sk(sk);
166
167 pr_debug("found: %p: num = %d, daddr = %ld, dif = %d\n", sk,
168 (int)isk->inet_num, (unsigned long)isk->inet_rcv_saddr,
169 sk->sk_bound_dev_if);
170
171 pr_debug("iterate\n");
172 if (isk->inet_num != ident)
173 continue;
174 if (isk->inet_rcv_saddr && isk->inet_rcv_saddr != daddr)
175 continue;
176 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)
177 continue;
178
179 sock_hold(sk);
180 goto exit;
181 }
182
183 sk = NULL;
184exit:
185 read_unlock_bh(&ping_table.lock);
186
187 return sk;
188}
189
190static int ping_init_sock(struct sock *sk)
191{
192 struct net *net = sock_net(sk);
193 gid_t group = current_egid();
194 gid_t range[2];
195 struct group_info *group_info = get_current_groups();
196 int i, j, count = group_info->ngroups;
197
198 inet_get_ping_group_range_net(net, range, range+1);
199 if (range[0] <= group && group <= range[1])
200 return 0;
201
202 for (i = 0; i < group_info->nblocks; i++) {
203 int cp_count = min_t(int, NGROUPS_PER_BLOCK, count);
204
205 for (j = 0; j < cp_count; j++) {
206 group = group_info->blocks[i][j];
207 if (range[0] <= group && group <= range[1])
208 return 0;
209 }
210
211 count -= cp_count;
212 }
213
214 return -EACCES;
215}
216
217static void ping_close(struct sock *sk, long timeout)
218{
219 pr_debug("ping_close(sk=%p,sk->num=%u)\n",
220 inet_sk(sk), inet_sk(sk)->inet_num);
221 pr_debug("isk->refcnt = %d\n", sk->sk_refcnt.counter);
222
223 sk_common_release(sk);
224}
225
226/*
227 * We need our own bind because there are no privileged id's == local ports.
228 * Moreover, we don't allow binding to multi- and broadcast addresses.
229 */
230
231static int ping_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
232{
233 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
234 struct inet_sock *isk = inet_sk(sk);
235 unsigned short snum;
236 int chk_addr_ret;
237 int err;
238
239 if (addr_len < sizeof(struct sockaddr_in))
240 return -EINVAL;
241
242 pr_debug("ping_v4_bind(sk=%p,sa_addr=%08x,sa_port=%d)\n",
243 sk, addr->sin_addr.s_addr, ntohs(addr->sin_port));
244
245 chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr);
246 if (addr->sin_addr.s_addr == INADDR_ANY)
247 chk_addr_ret = RTN_LOCAL;
248
249 if ((sysctl_ip_nonlocal_bind == 0 &&
250 isk->freebind == 0 && isk->transparent == 0 &&
251 chk_addr_ret != RTN_LOCAL) ||
252 chk_addr_ret == RTN_MULTICAST ||
253 chk_addr_ret == RTN_BROADCAST)
254 return -EADDRNOTAVAIL;
255
256 lock_sock(sk);
257
258 err = -EINVAL;
259 if (isk->inet_num != 0)
260 goto out;
261
262 err = -EADDRINUSE;
263 isk->inet_rcv_saddr = isk->inet_saddr = addr->sin_addr.s_addr;
264 snum = ntohs(addr->sin_port);
265 if (ping_v4_get_port(sk, snum) != 0) {
266 isk->inet_saddr = isk->inet_rcv_saddr = 0;
267 goto out;
268 }
269
270 pr_debug("after bind(): num = %d, daddr = %ld, dif = %d\n",
271 (int)isk->inet_num,
272 (unsigned long) isk->inet_rcv_saddr,
273 (int)sk->sk_bound_dev_if);
274
275 err = 0;
276 if (isk->inet_rcv_saddr)
277 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
278 if (snum)
279 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
280 isk->inet_sport = htons(isk->inet_num);
281 isk->inet_daddr = 0;
282 isk->inet_dport = 0;
283 sk_dst_reset(sk);
284out:
285 release_sock(sk);
286 pr_debug("ping_v4_bind -> %d\n", err);
287 return err;
288}
289
290/*
291 * Is this a supported type of ICMP message?
292 */
293
294static inline int ping_supported(int type, int code)
295{
296 if (type == ICMP_ECHO && code == 0)
297 return 1;
298 return 0;
299}
300
301/*
302 * This routine is called by the ICMP module when it gets some
303 * sort of error condition.
304 */
305
306static int ping_queue_rcv_skb(struct sock *sk, struct sk_buff *skb);
307
308void ping_err(struct sk_buff *skb, u32 info)
309{
310 struct iphdr *iph = (struct iphdr *)skb->data;
311 struct icmphdr *icmph = (struct icmphdr *)(skb->data+(iph->ihl<<2));
312 struct inet_sock *inet_sock;
313 int type = icmph->type;
314 int code = icmph->code;
315 struct net *net = dev_net(skb->dev);
316 struct sock *sk;
317 int harderr;
318 int err;
319
320 /* We assume the packet has already been checked by icmp_unreach */
321
322 if (!ping_supported(icmph->type, icmph->code))
323 return;
324
325 pr_debug("ping_err(type=%04x,code=%04x,id=%04x,seq=%04x)\n", type,
326 code, ntohs(icmph->un.echo.id), ntohs(icmph->un.echo.sequence));
327
328 sk = ping_v4_lookup(net, iph->daddr, iph->saddr,
329 ntohs(icmph->un.echo.id), skb->dev->ifindex);
330 if (sk == NULL) {
331 ICMP_INC_STATS_BH(net, ICMP_MIB_INERRORS);
332 pr_debug("no socket, dropping\n");
333 return; /* No socket for error */
334 }
335 pr_debug("err on socket %p\n", sk);
336
337 err = 0;
338 harderr = 0;
339 inet_sock = inet_sk(sk);
340
341 switch (type) {
342 default:
343 case ICMP_TIME_EXCEEDED:
344 err = EHOSTUNREACH;
345 break;
346 case ICMP_SOURCE_QUENCH:
347 /* This is not a real error but ping wants to see it.
348 * Report it with some fake errno. */
349 err = EREMOTEIO;
350 break;
351 case ICMP_PARAMETERPROB:
352 err = EPROTO;
353 harderr = 1;
354 break;
355 case ICMP_DEST_UNREACH:
356 if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */
357 if (inet_sock->pmtudisc != IP_PMTUDISC_DONT) {
358 err = EMSGSIZE;
359 harderr = 1;
360 break;
361 }
362 goto out;
363 }
364 err = EHOSTUNREACH;
365 if (code <= NR_ICMP_UNREACH) {
366 harderr = icmp_err_convert[code].fatal;
367 err = icmp_err_convert[code].errno;
368 }
369 break;
370 case ICMP_REDIRECT:
371 /* See ICMP_SOURCE_QUENCH */
372 err = EREMOTEIO;
373 break;
374 }
375
376 /*
377 * RFC1122: OK. Passes ICMP errors back to application, as per
378 * 4.1.3.3.
379 */
380 if (!inet_sock->recverr) {
381 if (!harderr || sk->sk_state != TCP_ESTABLISHED)
382 goto out;
383 } else {
384 ip_icmp_error(sk, skb, err, 0 /* no remote port */,
385 info, (u8 *)icmph);
386 }
387 sk->sk_err = err;
388 sk->sk_error_report(sk);
389out:
390 sock_put(sk);
391}
392
393/*
394 * Copy and checksum an ICMP Echo packet from user space into a buffer.
395 */
396
397struct pingfakehdr {
398 struct icmphdr icmph;
399 struct iovec *iov;
400 u32 wcheck;
401};
402
403static int ping_getfrag(void *from, char * to,
404 int offset, int fraglen, int odd, struct sk_buff *skb)
405{
406 struct pingfakehdr *pfh = (struct pingfakehdr *)from;
407
408 if (offset == 0) {
409 if (fraglen < sizeof(struct icmphdr))
410 BUG();
411 if (csum_partial_copy_fromiovecend(to + sizeof(struct icmphdr),
412 pfh->iov, 0, fraglen - sizeof(struct icmphdr),
413 &pfh->wcheck))
414 return -EFAULT;
415
416 return 0;
417 }
418 if (offset < sizeof(struct icmphdr))
419 BUG();
420 if (csum_partial_copy_fromiovecend
421 (to, pfh->iov, offset - sizeof(struct icmphdr),
422 fraglen, &pfh->wcheck))
423 return -EFAULT;
424 return 0;
425}
426
427static int ping_push_pending_frames(struct sock *sk, struct pingfakehdr *pfh, struct flowi4 *fl4)
428{
429 struct sk_buff *skb = skb_peek(&sk->sk_write_queue);
430
431 pfh->wcheck = csum_partial((char *)&pfh->icmph,
432 sizeof(struct icmphdr), pfh->wcheck);
433 pfh->icmph.checksum = csum_fold(pfh->wcheck);
434 memcpy(icmp_hdr(skb), &pfh->icmph, sizeof(struct icmphdr));
435 skb->ip_summed = CHECKSUM_NONE;
436 return ip_push_pending_frames(sk, fl4);
437}
438
439int ping_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
440 size_t len)
441{
442 struct net *net = sock_net(sk);
443 struct flowi4 fl4;
444 struct inet_sock *inet = inet_sk(sk);
445 struct ipcm_cookie ipc;
446 struct icmphdr user_icmph;
447 struct pingfakehdr pfh;
448 struct rtable *rt = NULL;
449 struct ip_options_data opt_copy;
450 int free = 0;
451 u32 saddr, daddr, faddr;
452 u8 tos;
453 int err;
454
455 pr_debug("ping_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num);
456
457
458 if (len > 0xFFFF)
459 return -EMSGSIZE;
460
461 /*
462 * Check the flags.
463 */
464
465 /* Mirror BSD error message compatibility */
466 if (msg->msg_flags & MSG_OOB)
467 return -EOPNOTSUPP;
468
469 /*
470 * Fetch the ICMP header provided by the userland.
471 * iovec is modified!
472 */
473
474 if (memcpy_fromiovec((u8 *)&user_icmph, msg->msg_iov,
475 sizeof(struct icmphdr)))
476 return -EFAULT;
477 if (!ping_supported(user_icmph.type, user_icmph.code))
478 return -EINVAL;
479
480 /*
481 * Get and verify the address.
482 */
483
484 if (msg->msg_name) {
485 struct sockaddr_in *usin = (struct sockaddr_in *)msg->msg_name;
486 if (msg->msg_namelen < sizeof(*usin))
487 return -EINVAL;
488 if (usin->sin_family != AF_INET)
489 return -EINVAL;
490 daddr = usin->sin_addr.s_addr;
491 /* no remote port */
492 } else {
493 if (sk->sk_state != TCP_ESTABLISHED)
494 return -EDESTADDRREQ;
495 daddr = inet->inet_daddr;
496 /* no remote port */
497 }
498
499 ipc.addr = inet->inet_saddr;
500 ipc.opt = NULL;
501 ipc.oif = sk->sk_bound_dev_if;
502 ipc.tx_flags = 0;
503 err = sock_tx_timestamp(sk, &ipc.tx_flags);
504 if (err)
505 return err;
506
507 if (msg->msg_controllen) {
508 err = ip_cmsg_send(sock_net(sk), msg, &ipc);
509 if (err)
510 return err;
511 if (ipc.opt)
512 free = 1;
513 }
514 if (!ipc.opt) {
515 struct ip_options_rcu *inet_opt;
516
517 rcu_read_lock();
518 inet_opt = rcu_dereference(inet->inet_opt);
519 if (inet_opt) {
520 memcpy(&opt_copy, inet_opt,
521 sizeof(*inet_opt) + inet_opt->opt.optlen);
522 ipc.opt = &opt_copy.opt;
523 }
524 rcu_read_unlock();
525 }
526
527 saddr = ipc.addr;
528 ipc.addr = faddr = daddr;
529
530 if (ipc.opt && ipc.opt->opt.srr) {
531 if (!daddr)
532 return -EINVAL;
533 faddr = ipc.opt->opt.faddr;
534 }
535 tos = RT_TOS(inet->tos);
536 if (sock_flag(sk, SOCK_LOCALROUTE) ||
537 (msg->msg_flags & MSG_DONTROUTE) ||
538 (ipc.opt && ipc.opt->opt.is_strictroute)) {
539 tos |= RTO_ONLINK;
540 }
541
542 if (ipv4_is_multicast(daddr)) {
543 if (!ipc.oif)
544 ipc.oif = inet->mc_index;
545 if (!saddr)
546 saddr = inet->mc_addr;
547 }
548
549 flowi4_init_output(&fl4, ipc.oif, sk->sk_mark, tos,
550 RT_SCOPE_UNIVERSE, sk->sk_protocol,
551 inet_sk_flowi_flags(sk), faddr, saddr, 0, 0);
552
553 security_sk_classify_flow(sk, flowi4_to_flowi(&fl4));
554 rt = ip_route_output_flow(net, &fl4, sk);
555 if (IS_ERR(rt)) {
556 err = PTR_ERR(rt);
557 rt = NULL;
558 if (err == -ENETUNREACH)
559 IP_INC_STATS_BH(net, IPSTATS_MIB_OUTNOROUTES);
560 goto out;
561 }
562
563 err = -EACCES;
564 if ((rt->rt_flags & RTCF_BROADCAST) &&
565 !sock_flag(sk, SOCK_BROADCAST))
566 goto out;
567
568 if (msg->msg_flags & MSG_CONFIRM)
569 goto do_confirm;
570back_from_confirm:
571
572 if (!ipc.addr)
573 ipc.addr = fl4.daddr;
574
575 lock_sock(sk);
576
577 pfh.icmph.type = user_icmph.type; /* already checked */
578 pfh.icmph.code = user_icmph.code; /* ditto */
579 pfh.icmph.checksum = 0;
580 pfh.icmph.un.echo.id = inet->inet_sport;
581 pfh.icmph.un.echo.sequence = user_icmph.un.echo.sequence;
582 pfh.iov = msg->msg_iov;
583 pfh.wcheck = 0;
584
585 err = ip_append_data(sk, &fl4, ping_getfrag, &pfh, len,
586 0, &ipc, &rt, msg->msg_flags);
587 if (err)
588 ip_flush_pending_frames(sk);
589 else
590 err = ping_push_pending_frames(sk, &pfh, &fl4);
591 release_sock(sk);
592
593out:
594 ip_rt_put(rt);
595 if (free)
596 kfree(ipc.opt);
597 if (!err) {
598 icmp_out_count(sock_net(sk), user_icmph.type);
599 return len;
600 }
601 return err;
602
603do_confirm:
604 dst_confirm(&rt->dst);
605 if (!(msg->msg_flags & MSG_PROBE) || len)
606 goto back_from_confirm;
607 err = 0;
608 goto out;
609}
610
c319b4d7
VK		 611int ping_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
612 size_t len, int noblock, int flags, int *addr_len)
613{
614 struct inet_sock *isk = inet_sk(sk);
615 struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name;
616 struct sk_buff *skb;
617 int copied, err;
618
619 pr_debug("ping_recvmsg(sk=%p,sk->num=%u)\n", isk, isk->inet_num);
620
621 if (flags & MSG_OOB)
622 goto out;
623
624 if (addr_len)
625 *addr_len = sizeof(*sin);
626
627 if (flags & MSG_ERRQUEUE)
628 return ip_recv_error(sk, msg, len);
629
630 skb = skb_recv_datagram(sk, flags, noblock, &err);
631 if (!skb)
632 goto out;
633
634 copied = skb->len;
635 if (copied > len) {
636 msg->msg_flags |= MSG_TRUNC;
637 copied = len;
638 }
639
640 /* Don't bother checking the checksum */
641 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
642 if (err)
643 goto done;
644
645 sock_recv_timestamp(msg, sk, skb);
646
647 /* Copy the address. */
648 if (sin) {
649 sin->sin_family = AF_INET;
650 sin->sin_port = 0 /* skb->h.uh->source */;
651 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
652 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
653 }
654 if (isk->cmsg_flags)
655 ip_cmsg_recv(msg, skb);
656 err = copied;
657
658done:
659 skb_free_datagram(sk, skb);
660out:
661 pr_debug("ping_recvmsg -> %d\n", err);
662 return err;
663}
664
665static int ping_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
666{
667 pr_debug("ping_queue_rcv_skb(sk=%p,sk->num=%d,skb=%p)\n",
668 inet_sk(sk), inet_sk(sk)->inet_num, skb);
669 if (sock_queue_rcv_skb(sk, skb) < 0) {
670 ICMP_INC_STATS_BH(sock_net(sk), ICMP_MIB_INERRORS);
671 kfree_skb(skb);
672 pr_debug("ping_queue_rcv_skb -> failed\n");
673 return -1;
674 }
675 return 0;
676}
677
678
679/*
680 * All we need to do is get the socket.
681 */
682
683void ping_rcv(struct sk_buff *skb)
684{
685 struct sock *sk;
686 struct net *net = dev_net(skb->dev);
687 struct iphdr *iph = ip_hdr(skb);
688 struct icmphdr *icmph = icmp_hdr(skb);
689 u32 saddr = iph->saddr;
690 u32 daddr = iph->daddr;
691
692 /* We assume the packet has already been checked by icmp_rcv */
693
694 pr_debug("ping_rcv(skb=%p,id=%04x,seq=%04x)\n",
695 skb, ntohs(icmph->un.echo.id), ntohs(icmph->un.echo.sequence));
696
697 /* Push ICMP header back */
698 skb_push(skb, skb->data - (u8 *)icmph);
699
700 sk = ping_v4_lookup(net, saddr, daddr, ntohs(icmph->un.echo.id),
701 skb->dev->ifindex);
702 if (sk != NULL) {
703 pr_debug("rcv on socket %p\n", sk);
704 ping_queue_rcv_skb(sk, skb_get(skb));
705 sock_put(sk);
706 return;
707 }
708 pr_debug("no socket, dropping\n");
709
710 /* We're called from icmp_rcv(). kfree_skb() is done there. */
711}
712
713struct proto ping_prot = {
714 .name = "PING",
715 .owner = THIS_MODULE,
716 .init = ping_init_sock,
717 .close = ping_close,
718 .connect = ip4_datagram_connect,
719 .disconnect = udp_disconnect,
c319b4d7
VK		 720 .setsockopt = ip_setsockopt,
721 .getsockopt = ip_getsockopt,
722 .sendmsg = ping_sendmsg,
723 .recvmsg = ping_recvmsg,
724 .bind = ping_bind,
725 .backlog_rcv = ping_queue_rcv_skb,
726 .hash = ping_v4_hash,
727 .unhash = ping_v4_unhash,
728 .get_port = ping_v4_get_port,
729 .obj_size = sizeof(struct inet_sock),
730};
731EXPORT_SYMBOL(ping_prot);
732
733#ifdef CONFIG_PROC_FS
734
735static struct sock *ping_get_first(struct seq_file *seq, int start)
736{
737 struct sock *sk;
738 struct ping_iter_state *state = seq->private;
739 struct net *net = seq_file_net(seq);
740
741 for (state->bucket = start; state->bucket < PING_HTABLE_SIZE;
742 ++state->bucket) {
743 struct hlist_nulls_node *node;
744 struct hlist_nulls_head *hslot = &ping_table.hash[state->bucket];
745
746 if (hlist_nulls_empty(hslot))
747 continue;
748
749 sk_nulls_for_each(sk, node, hslot) {
750 if (net_eq(sock_net(sk), net))
751 goto found;
752 }
753 }
754 sk = NULL;
755found:
756 return sk;
757}
758
759static struct sock *ping_get_next(struct seq_file *seq, struct sock *sk)
760{
761 struct ping_iter_state *state = seq->private;
762 struct net *net = seq_file_net(seq);
763
764 do {
765 sk = sk_nulls_next(sk);
766 } while (sk && (!net_eq(sock_net(sk), net)));
767
768 if (!sk)
769 return ping_get_first(seq, state->bucket + 1);
770 return sk;
771}
772
773static struct sock *ping_get_idx(struct seq_file *seq, loff_t pos)
774{
775 struct sock *sk = ping_get_first(seq, 0);
776
777 if (sk)
778 while (pos && (sk = ping_get_next(seq, sk)) != NULL)
779 --pos;
780 return pos ? NULL : sk;
781}
782
783static void *ping_seq_start(struct seq_file *seq, loff_t *pos)
784{
785 struct ping_iter_state *state = seq->private;
786 state->bucket = 0;
787
788 read_lock_bh(&ping_table.lock);
789
790 return *pos ? ping_get_idx(seq, *pos-1) : SEQ_START_TOKEN;
791}
792
793static void *ping_seq_next(struct seq_file *seq, void *v, loff_t *pos)
794{
795 struct sock *sk;
796
797 if (v == SEQ_START_TOKEN)
798 sk = ping_get_idx(seq, 0);
799 else
800 sk = ping_get_next(seq, v);
801
802 ++*pos;
803 return sk;
804}
805
806static void ping_seq_stop(struct seq_file *seq, void *v)
807{
808 read_unlock_bh(&ping_table.lock);
809}
810
811static void ping_format_sock(struct sock *sp, struct seq_file *f,
812 int bucket, int *len)
813{
814 struct inet_sock *inet = inet_sk(sp);
815 __be32 dest = inet->inet_daddr;
816 __be32 src = inet->inet_rcv_saddr;
817 __u16 destp = ntohs(inet->inet_dport);
818 __u16 srcp = ntohs(inet->inet_sport);
819
820 seq_printf(f, "%5d: %08X:%04X %08X:%04X"
821 " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %d%n",
822 bucket, src, srcp, dest, destp, sp->sk_state,
823 sk_wmem_alloc_get(sp),
824 sk_rmem_alloc_get(sp),
825 0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp),
826 atomic_read(&sp->sk_refcnt), sp,
827 atomic_read(&sp->sk_drops), len);
828}
829
830static int ping_seq_show(struct seq_file *seq, void *v)
831{
832 if (v == SEQ_START_TOKEN)
833 seq_printf(seq, "%-127s\n",
834 " sl local_address rem_address st tx_queue "
835 "rx_queue tr tm->when retrnsmt uid timeout "
836 "inode ref pointer drops");
837 else {
838 struct ping_iter_state *state = seq->private;
839 int len;
840
841 ping_format_sock(v, seq, state->bucket, &len);
842 seq_printf(seq, "%*s\n", 127 - len, "");
843 }
844 return 0;
845}
846
847static const struct seq_operations ping_seq_ops = {
848 .show = ping_seq_show,
849 .start = ping_seq_start,
850 .next = ping_seq_next,
851 .stop = ping_seq_stop,
852};
853
854static int ping_seq_open(struct inode *inode, struct file *file)
855{
856 return seq_open_net(inode, file, &ping_seq_ops,
857 sizeof(struct ping_iter_state));
858}
859
860static const struct file_operations ping_seq_fops = {
861 .open = ping_seq_open,
862 .read = seq_read,
863 .llseek = seq_lseek,
864 .release = seq_release_net,
865};
866
867static int ping_proc_register(struct net *net)
868{
869 struct proc_dir_entry *p;
870 int rc = 0;
871
872 p = proc_net_fops_create(net, "icmp", S_IRUGO, &ping_seq_fops);
873 if (!p)
874 rc = -ENOMEM;
875 return rc;
876}
877
878static void ping_proc_unregister(struct net *net)
879{
880 proc_net_remove(net, "icmp");
881}
882
883
884static int __net_init ping_proc_init_net(struct net *net)
885{
886 return ping_proc_register(net);
887}
888
889static void __net_exit ping_proc_exit_net(struct net *net)
890{
891 ping_proc_unregister(net);
892}
893
894static struct pernet_operations ping_net_ops = {
895 .init = ping_proc_init_net,
896 .exit = ping_proc_exit_net,
897};
898
899int __init ping_proc_init(void)
900{
901 return register_pernet_subsys(&ping_net_ops);
902}
903
904void ping_proc_exit(void)
905{
906 unregister_pernet_subsys(&ping_net_ops);
907}
908
909#endif
910
911void __init ping_init(void)
912{
913 int i;
914
915 for (i = 0; i < PING_HTABLE_SIZE; i++)
916 INIT_HLIST_NULLS_HEAD(&ping_table.hash[i], i);
917 rwlock_init(&ping_table.lock);
918}
Linux 6.x block layer and io_uring tree(s)