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import PULS_20180308
[GitHub/mt8127/android_kernel_alcatel_ttab.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
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_info("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 sk_nulls_node_init(&sk->sk_nulls_node);
158 sock_put(sk);
159 isk->inet_num = 0;
160 isk->inet_sport = 0;
161 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
162 write_unlock_bh(&ping_table.lock);
163 pr_info("ping_unhash(isk=%p,sk=%p)\n", isk, sk);
164 }
165 }
166 EXPORT_SYMBOL_GPL(ping_unhash);
167
168 static struct sock *ping_lookup(struct net *net, struct sk_buff *skb, u16 ident)
169 {
170 struct hlist_nulls_head *hslot = ping_hashslot(&ping_table, net, ident);
171 struct sock *sk = NULL;
172 struct inet_sock *isk;
173 struct hlist_nulls_node *hnode;
174 int dif = skb->dev->ifindex;
175
176 if (skb->protocol == htons(ETH_P_IP)) {
177 pr_debug("try to find: num = %d, daddr = %pI4, dif = %d\n",
178 (int)ident, &ip_hdr(skb)->daddr, dif);
179 #if IS_ENABLED(CONFIG_IPV6)
180 } else if (skb->protocol == htons(ETH_P_IPV6)) {
181 pr_debug("try to find: num = %d, daddr = %pI6c, dif = %d\n",
182 (int)ident, &ipv6_hdr(skb)->daddr, dif);
183 #endif
184 }
185
186 read_lock_bh(&ping_table.lock);
187
188 ping_portaddr_for_each_entry(sk, hnode, hslot) {
189 isk = inet_sk(sk);
190
191 pr_debug("iterate\n");
192 if (isk->inet_num != ident)
193 continue;
194
195 if (skb->protocol == htons(ETH_P_IP) &&
196 sk->sk_family == AF_INET) {
197 pr_debug("found: %p: num=%d, daddr=%pI4, dif=%d\n", sk,
198 (int) isk->inet_num, &isk->inet_rcv_saddr,
199 sk->sk_bound_dev_if);
200
201 if (isk->inet_rcv_saddr &&
202 isk->inet_rcv_saddr != ip_hdr(skb)->daddr)
203 continue;
204 #if IS_ENABLED(CONFIG_IPV6)
205 } else if (skb->protocol == htons(ETH_P_IPV6) &&
206 sk->sk_family == AF_INET6) {
207 struct ipv6_pinfo *np = inet6_sk(sk);
208
209 pr_debug("found: %p: num=%d, daddr=%pI6c, dif=%d\n", sk,
210 (int) isk->inet_num,
211 &inet6_sk(sk)->rcv_saddr,
212 sk->sk_bound_dev_if);
213
214 if (!ipv6_addr_any(&np->rcv_saddr) &&
215 !ipv6_addr_equal(&np->rcv_saddr,
216 &ipv6_hdr(skb)->daddr))
217 continue;
218 #endif
219 }
220
221 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)
222 continue;
223
224 sock_hold(sk);
225 goto exit;
226 }
227
228 sk = NULL;
229 exit:
230 read_unlock_bh(&ping_table.lock);
231
232 return sk;
233 }
234
235 static void inet_get_ping_group_range_net(struct net *net, kgid_t *low,
236 kgid_t *high)
237 {
238 kgid_t *data = net->ipv4.sysctl_ping_group_range;
239 unsigned int seq;
240
241 do {
242 seq = read_seqbegin(&sysctl_local_ports.lock);
243
244 *low = data[0];
245 *high = data[1];
246 } while (read_seqretry(&sysctl_local_ports.lock, seq));
247 }
248
249
250 int ping_init_sock(struct sock *sk)
251 {
252 struct net *net = sock_net(sk);
253 kgid_t group = current_egid();
254 struct group_info *group_info;
255 int i, j, count;
256 kgid_t low, high;
257 int ret = 0;
258
259 inet_get_ping_group_range_net(net, &low, &high);
260 if (gid_lte(low, group) && gid_lte(group, high))
261 return 0;
262
263 group_info = get_current_groups();
264 count = group_info->ngroups;
265 for (i = 0; i < group_info->nblocks; i++) {
266 int cp_count = min_t(int, NGROUPS_PER_BLOCK, count);
267 for (j = 0; j < cp_count; j++) {
268 kgid_t gid = group_info->blocks[i][j];
269 if (gid_lte(low, gid) && gid_lte(gid, high))
270 goto out_release_group;
271 }
272
273 count -= cp_count;
274 }
275
276 ret = -EACCES;
277
278 out_release_group:
279 put_group_info(group_info);
280 return ret;
281 }
282 EXPORT_SYMBOL_GPL(ping_init_sock);
283
284 void ping_close(struct sock *sk, long timeout)
285 {
286 pr_debug("ping_close(sk=%p,sk->num=%u)\n",
287 inet_sk(sk), inet_sk(sk)->inet_num);
288 pr_debug("isk->refcnt = %d\n", sk->sk_refcnt.counter);
289
290 sk_common_release(sk);
291 pr_info("ping_close done\n");
292 }
293 EXPORT_SYMBOL_GPL(ping_close);
294
295 /* Checks the bind address and possibly modifies sk->sk_bound_dev_if. */
296 int ping_check_bind_addr(struct sock *sk, struct inet_sock *isk,
297 struct sockaddr *uaddr, int addr_len) {
298 struct net *net = sock_net(sk);
299 if (sk->sk_family == AF_INET) {
300 struct sockaddr_in *addr = (struct sockaddr_in *) uaddr;
301 int chk_addr_ret;
302
303 if (addr_len < sizeof(*addr))
304 return -EINVAL;
305
306 pr_debug("ping_check_bind_addr(sk=%p,addr=%pI4,port=%d)\n",
307 sk, &addr->sin_addr.s_addr, ntohs(addr->sin_port));
308
309 chk_addr_ret = inet_addr_type(net, addr->sin_addr.s_addr);
310
311 if (addr->sin_addr.s_addr == htonl(INADDR_ANY))
312 chk_addr_ret = RTN_LOCAL;
313
314 if ((sysctl_ip_nonlocal_bind == 0 &&
315 isk->freebind == 0 && isk->transparent == 0 &&
316 chk_addr_ret != RTN_LOCAL) ||
317 chk_addr_ret == RTN_MULTICAST ||
318 chk_addr_ret == RTN_BROADCAST)
319 return -EADDRNOTAVAIL;
320
321 #if IS_ENABLED(CONFIG_IPV6)
322 } else if (sk->sk_family == AF_INET6) {
323 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr;
324 int addr_type, scoped, has_addr;
325 struct net_device *dev = NULL;
326
327 if (addr_len < sizeof(*addr))
328 return -EINVAL;
329
330 pr_debug("ping_check_bind_addr(sk=%p,addr=%pI6c,port=%d)\n",
331 sk, addr->sin6_addr.s6_addr, ntohs(addr->sin6_port));
332
333 addr_type = ipv6_addr_type(&addr->sin6_addr);
334 scoped = __ipv6_addr_needs_scope_id(addr_type);
335 if ((addr_type != IPV6_ADDR_ANY &&
336 !(addr_type & IPV6_ADDR_UNICAST)) ||
337 (scoped && !addr->sin6_scope_id))
338 return -EINVAL;
339
340 rcu_read_lock();
341 if (addr->sin6_scope_id) {
342 dev = dev_get_by_index_rcu(net, addr->sin6_scope_id);
343 if (!dev) {
344 rcu_read_unlock();
345 return -ENODEV;
346 }
347 }
348 has_addr = pingv6_ops.ipv6_chk_addr(net, &addr->sin6_addr, dev,
349 scoped);
350 rcu_read_unlock();
351
352 if (!(isk->freebind || isk->transparent || has_addr ||
353 addr_type == IPV6_ADDR_ANY))
354 return -EADDRNOTAVAIL;
355
356 if (scoped)
357 sk->sk_bound_dev_if = addr->sin6_scope_id;
358 #endif
359 } else {
360 return -EAFNOSUPPORT;
361 }
362 return 0;
363 }
364
365 void ping_set_saddr(struct sock *sk, struct sockaddr *saddr)
366 {
367 if (saddr->sa_family == AF_INET) {
368 struct inet_sock *isk = inet_sk(sk);
369 struct sockaddr_in *addr = (struct sockaddr_in *) saddr;
370 isk->inet_rcv_saddr = isk->inet_saddr = addr->sin_addr.s_addr;
371 #if IS_ENABLED(CONFIG_IPV6)
372 } else if (saddr->sa_family == AF_INET6) {
373 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) saddr;
374 struct ipv6_pinfo *np = inet6_sk(sk);
375 np->rcv_saddr = np->saddr = addr->sin6_addr;
376 #endif
377 }
378 }
379
380 void ping_clear_saddr(struct sock *sk, int dif)
381 {
382 sk->sk_bound_dev_if = dif;
383 if (sk->sk_family == AF_INET) {
384 struct inet_sock *isk = inet_sk(sk);
385 isk->inet_rcv_saddr = isk->inet_saddr = 0;
386 #if IS_ENABLED(CONFIG_IPV6)
387 } else if (sk->sk_family == AF_INET6) {
388 struct ipv6_pinfo *np = inet6_sk(sk);
389 memset(&np->rcv_saddr, 0, sizeof(np->rcv_saddr));
390 memset(&np->saddr, 0, sizeof(np->saddr));
391 #endif
392 }
393 }
394 /*
395 * We need our own bind because there are no privileged id's == local ports.
396 * Moreover, we don't allow binding to multi- and broadcast addresses.
397 */
398
399 int ping_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
400 {
401 struct inet_sock *isk = inet_sk(sk);
402 unsigned short snum;
403 int err;
404 int dif = sk->sk_bound_dev_if;
405
406 err = ping_check_bind_addr(sk, isk, uaddr, addr_len);
407 if (err)
408 return err;
409
410 lock_sock(sk);
411
412 err = -EINVAL;
413 if (isk->inet_num != 0)
414 goto out;
415
416 err = -EADDRINUSE;
417 ping_set_saddr(sk, uaddr);
418 snum = ntohs(((struct sockaddr_in *)uaddr)->sin_port);
419 if (ping_get_port(sk, snum) != 0) {
420 ping_clear_saddr(sk, dif);
421 goto out;
422 }
423
424 pr_debug("after bind(): num = %d, dif = %d\n",
425 (int)isk->inet_num,
426 (int)sk->sk_bound_dev_if);
427
428 err = 0;
429 if ((sk->sk_family == AF_INET && isk->inet_rcv_saddr) ||
430 (sk->sk_family == AF_INET6 &&
431 !ipv6_addr_any(&inet6_sk(sk)->rcv_saddr)))
432 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
433
434 if (snum)
435 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
436 isk->inet_sport = htons(isk->inet_num);
437 isk->inet_daddr = 0;
438 isk->inet_dport = 0;
439
440 #if IS_ENABLED(CONFIG_IPV6)
441 if (sk->sk_family == AF_INET6)
442 memset(&inet6_sk(sk)->daddr, 0, sizeof(inet6_sk(sk)->daddr));
443 #endif
444
445 sk_dst_reset(sk);
446 out:
447 release_sock(sk);
448 pr_debug("ping_v4_bind -> %d\n", err);
449 return err;
450 }
451 EXPORT_SYMBOL_GPL(ping_bind);
452
453 /*
454 * Is this a supported type of ICMP message?
455 */
456
457 static inline int ping_supported(int family, int type, int code)
458 {
459 return (family == AF_INET && type == ICMP_ECHO && code == 0) ||
460 (family == AF_INET6 && type == ICMPV6_ECHO_REQUEST && code == 0);
461 }
462
463 /*
464 * This routine is called by the ICMP module when it gets some
465 * sort of error condition.
466 */
467
468 void ping_err(struct sk_buff *skb, int offset, u32 info)
469 {
470 int family;
471 struct icmphdr *icmph;
472 struct inet_sock *inet_sock;
473 int type;
474 int code;
475 struct net *net = dev_net(skb->dev);
476 struct sock *sk;
477 int harderr;
478 int err;
479
480 if (skb->protocol == htons(ETH_P_IP)) {
481 family = AF_INET;
482 type = icmp_hdr(skb)->type;
483 code = icmp_hdr(skb)->code;
484 icmph = (struct icmphdr *)(skb->data + offset);
485 } else if (skb->protocol == htons(ETH_P_IPV6)) {
486 family = AF_INET6;
487 type = icmp6_hdr(skb)->icmp6_type;
488 code = icmp6_hdr(skb)->icmp6_code;
489 icmph = (struct icmphdr *) (skb->data + offset);
490 } else {
491 BUG();
492 }
493
494 /* We assume the packet has already been checked by icmp_unreach */
495
496 if (!ping_supported(family, icmph->type, icmph->code))
497 return;
498
499 pr_debug("ping_err(proto=0x%x,type=%d,code=%d,id=%04x,seq=%04x)\n",
500 skb->protocol, type, code, ntohs(icmph->un.echo.id),
501 ntohs(icmph->un.echo.sequence));
502
503 sk = ping_lookup(net, skb, ntohs(icmph->un.echo.id));
504 if (sk == NULL) {
505 pr_debug("no socket, dropping\n");
506 return; /* No socket for error */
507 }
508 pr_debug("err on socket %p\n", sk);
509
510 err = 0;
511 harderr = 0;
512 inet_sock = inet_sk(sk);
513
514 if (skb->protocol == htons(ETH_P_IP)) {
515 switch (type) {
516 default:
517 case ICMP_TIME_EXCEEDED:
518 err = EHOSTUNREACH;
519 break;
520 case ICMP_SOURCE_QUENCH:
521 /* This is not a real error but ping wants to see it.
522 * Report it with some fake errno.
523 */
524 err = EREMOTEIO;
525 break;
526 case ICMP_PARAMETERPROB:
527 err = EPROTO;
528 harderr = 1;
529 break;
530 case ICMP_DEST_UNREACH:
531 if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */
532 ipv4_sk_update_pmtu(skb, sk, info);
533 if (inet_sock->pmtudisc != IP_PMTUDISC_DONT) {
534 err = EMSGSIZE;
535 harderr = 1;
536 break;
537 }
538 goto out;
539 }
540 err = EHOSTUNREACH;
541 if (code <= NR_ICMP_UNREACH) {
542 harderr = icmp_err_convert[code].fatal;
543 err = icmp_err_convert[code].errno;
544 }
545 break;
546 case ICMP_REDIRECT:
547 /* See ICMP_SOURCE_QUENCH */
548 ipv4_sk_redirect(skb, sk);
549 err = EREMOTEIO;
550 break;
551 }
552 #if IS_ENABLED(CONFIG_IPV6)
553 } else if (skb->protocol == htons(ETH_P_IPV6)) {
554 harderr = pingv6_ops.icmpv6_err_convert(type, code, &err);
555 #endif
556 }
557
558 /*
559 * RFC1122: OK. Passes ICMP errors back to application, as per
560 * 4.1.3.3.
561 */
562 if ((family == AF_INET && !inet_sock->recverr) ||
563 (family == AF_INET6 && !inet6_sk(sk)->recverr)) {
564 if (!harderr || sk->sk_state != TCP_ESTABLISHED)
565 goto out;
566 } else {
567 if (family == AF_INET) {
568 ip_icmp_error(sk, skb, err, 0 /* no remote port */,
569 info, (u8 *)icmph);
570 #if IS_ENABLED(CONFIG_IPV6)
571 } else if (family == AF_INET6) {
572 pingv6_ops.ipv6_icmp_error(sk, skb, err, 0,
573 info, (u8 *)icmph);
574 #endif
575 }
576 }
577 sk->sk_err = err;
578 sk->sk_error_report(sk);
579 out:
580 sock_put(sk);
581 }
582 EXPORT_SYMBOL_GPL(ping_err);
583
584 /*
585 * Copy and checksum an ICMP Echo packet from user space into a buffer
586 * starting from the payload.
587 */
588
589 int ping_getfrag(void *from, char *to,
590 int offset, int fraglen, int odd, struct sk_buff *skb)
591 {
592 struct pingfakehdr *pfh = (struct pingfakehdr *)from;
593
594 if (offset == 0) {
595 if (fraglen < sizeof(struct icmphdr))
596 BUG();
597 if (csum_partial_copy_fromiovecend(to + sizeof(struct icmphdr),
598 pfh->iov, 0, fraglen - sizeof(struct icmphdr),
599 &pfh->wcheck))
600 return -EFAULT;
601 } else if (offset < sizeof(struct icmphdr)) {
602 BUG();
603 } else {
604 if (csum_partial_copy_fromiovecend
605 (to, pfh->iov, offset - sizeof(struct icmphdr),
606 fraglen, &pfh->wcheck))
607 return -EFAULT;
608 }
609
610 #if IS_ENABLED(CONFIG_IPV6)
611 /* For IPv6, checksum each skb as we go along, as expected by
612 * icmpv6_push_pending_frames. For IPv4, accumulate the checksum in
613 * wcheck, it will be finalized in ping_v4_push_pending_frames.
614 */
615 if (pfh->family == AF_INET6) {
616 skb->csum = pfh->wcheck;
617 skb->ip_summed = CHECKSUM_NONE;
618 pfh->wcheck = 0;
619 }
620 #endif
621
622 return 0;
623 }
624 EXPORT_SYMBOL_GPL(ping_getfrag);
625
626 static int ping_v4_push_pending_frames(struct sock *sk, struct pingfakehdr *pfh,
627 struct flowi4 *fl4)
628 {
629 struct sk_buff *skb = skb_peek(&sk->sk_write_queue);
630
631 pfh->wcheck = csum_partial((char *)&pfh->icmph,
632 sizeof(struct icmphdr), pfh->wcheck);
633 pfh->icmph.checksum = csum_fold(pfh->wcheck);
634 memcpy(icmp_hdr(skb), &pfh->icmph, sizeof(struct icmphdr));
635 skb->ip_summed = CHECKSUM_NONE;
636 return ip_push_pending_frames(sk, fl4);
637 }
638
639 int ping_common_sendmsg(int family, struct msghdr *msg, size_t len,
640 void *user_icmph, size_t icmph_len) {
641 u8 type, code;
642
643 if (len > 0xFFFF || len < icmph_len)
644 return -EMSGSIZE;
645
646 /*
647 * Check the flags.
648 */
649
650 /* Mirror BSD error message compatibility */
651 if (msg->msg_flags & MSG_OOB)
652 return -EOPNOTSUPP;
653
654 /*
655 * Fetch the ICMP header provided by the userland.
656 * iovec is modified! The ICMP header is consumed.
657 */
658 if (memcpy_fromiovec(user_icmph, msg->msg_iov, icmph_len))
659 return -EFAULT;
660
661 if (family == AF_INET) {
662 type = ((struct icmphdr *) user_icmph)->type;
663 code = ((struct icmphdr *) user_icmph)->code;
664 #if IS_ENABLED(CONFIG_IPV6)
665 } else if (family == AF_INET6) {
666 type = ((struct icmp6hdr *) user_icmph)->icmp6_type;
667 code = ((struct icmp6hdr *) user_icmph)->icmp6_code;
668 #endif
669 } else {
670 BUG();
671 }
672
673 if (!ping_supported(family, type, code))
674 return -EINVAL;
675
676 return 0;
677 }
678 EXPORT_SYMBOL_GPL(ping_common_sendmsg);
679
680 int ping_v4_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
681 size_t len)
682 {
683 struct net *net = sock_net(sk);
684 struct flowi4 fl4;
685 struct inet_sock *inet = inet_sk(sk);
686 struct ipcm_cookie ipc;
687 struct icmphdr user_icmph;
688 struct pingfakehdr pfh;
689 struct rtable *rt = NULL;
690 struct ip_options_data opt_copy;
691 int free = 0;
692 __be32 saddr, daddr, faddr;
693 u8 tos;
694 int err;
695
696 pr_debug("ping_v4_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num);
697
698 err = ping_common_sendmsg(AF_INET, msg, len, &user_icmph,
699 sizeof(user_icmph));
700 if (err)
701 return err;
702
703 /*
704 * Get and verify the address.
705 */
706
707 if (msg->msg_name) {
708 struct sockaddr_in *usin = (struct sockaddr_in *)msg->msg_name;
709 if (msg->msg_namelen < sizeof(*usin))
710 return -EINVAL;
711 if (usin->sin_family != AF_INET)
712 return -EINVAL;
713 daddr = usin->sin_addr.s_addr;
714 /* no remote port */
715 } else {
716 if (sk->sk_state != TCP_ESTABLISHED)
717 return -EDESTADDRREQ;
718 daddr = inet->inet_daddr;
719 /* no remote port */
720 }
721
722 ipc.addr = inet->inet_saddr;
723 ipc.opt = NULL;
724 ipc.oif = sk->sk_bound_dev_if;
725 ipc.tx_flags = 0;
726
727 sock_tx_timestamp(sk, &ipc.tx_flags);
728
729 if (msg->msg_controllen) {
730 err = ip_cmsg_send(sock_net(sk), msg, &ipc);
731 if (err)
732 return err;
733 if (ipc.opt)
734 free = 1;
735 }
736 if (!ipc.opt) {
737 struct ip_options_rcu *inet_opt;
738
739 rcu_read_lock();
740 inet_opt = rcu_dereference(inet->inet_opt);
741 if (inet_opt) {
742 memcpy(&opt_copy, inet_opt,
743 sizeof(*inet_opt) + inet_opt->opt.optlen);
744 ipc.opt = &opt_copy.opt;
745 }
746 rcu_read_unlock();
747 }
748
749 saddr = ipc.addr;
750 ipc.addr = faddr = daddr;
751
752 if (ipc.opt && ipc.opt->opt.srr) {
753 if (!daddr)
754 return -EINVAL;
755 faddr = ipc.opt->opt.faddr;
756 }
757 tos = RT_TOS(inet->tos);
758 if (sock_flag(sk, SOCK_LOCALROUTE) ||
759 (msg->msg_flags & MSG_DONTROUTE) ||
760 (ipc.opt && ipc.opt->opt.is_strictroute)) {
761 tos |= RTO_ONLINK;
762 }
763
764 if (ipv4_is_multicast(daddr)) {
765 if (!ipc.oif)
766 ipc.oif = inet->mc_index;
767 if (!saddr)
768 saddr = inet->mc_addr;
769 } else if (!ipc.oif)
770 ipc.oif = inet->uc_index;
771
772 flowi4_init_output(&fl4, ipc.oif, sk->sk_mark, tos,
773 RT_SCOPE_UNIVERSE, sk->sk_protocol,
774 inet_sk_flowi_flags(sk), faddr, saddr, 0, 0,
775 sock_i_uid(sk));
776
777 security_sk_classify_flow(sk, flowi4_to_flowi(&fl4));
778 rt = ip_route_output_flow(net, &fl4, sk);
779 if (IS_ERR(rt)) {
780 err = PTR_ERR(rt);
781 rt = NULL;
782 if (err == -ENETUNREACH)
783 IP_INC_STATS_BH(net, IPSTATS_MIB_OUTNOROUTES);
784 goto out;
785 }
786
787 err = -EACCES;
788 if ((rt->rt_flags & RTCF_BROADCAST) &&
789 !sock_flag(sk, SOCK_BROADCAST))
790 goto out;
791
792 if (msg->msg_flags & MSG_CONFIRM)
793 goto do_confirm;
794 back_from_confirm:
795
796 if (!ipc.addr)
797 ipc.addr = fl4.daddr;
798
799 lock_sock(sk);
800
801 pfh.icmph.type = user_icmph.type; /* already checked */
802 pfh.icmph.code = user_icmph.code; /* ditto */
803 pfh.icmph.checksum = 0;
804 pfh.icmph.un.echo.id = inet->inet_sport;
805 pfh.icmph.un.echo.sequence = user_icmph.un.echo.sequence;
806 pfh.iov = msg->msg_iov;
807 pfh.wcheck = 0;
808 pfh.family = AF_INET;
809
810 err = ip_append_data(sk, &fl4, ping_getfrag, &pfh, len,
811 0, &ipc, &rt, msg->msg_flags);
812 if (err)
813 ip_flush_pending_frames(sk);
814 else
815 err = ping_v4_push_pending_frames(sk, &pfh, &fl4);
816 release_sock(sk);
817
818 out:
819 ip_rt_put(rt);
820 if (free)
821 kfree(ipc.opt);
822 if (!err) {
823 icmp_out_count(sock_net(sk), user_icmph.type);
824 return len;
825 }
826 return err;
827
828 do_confirm:
829 dst_confirm(&rt->dst);
830 if (!(msg->msg_flags & MSG_PROBE) || len)
831 goto back_from_confirm;
832 err = 0;
833 goto out;
834 }
835
836 int ping_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
837 size_t len, int noblock, int flags, int *addr_len)
838 {
839 struct inet_sock *isk = inet_sk(sk);
840 int family = sk->sk_family;
841 struct sockaddr_in *sin;
842 struct sockaddr_in6 *sin6;
843 struct sk_buff *skb;
844 int copied, err;
845
846 pr_debug("ping_recvmsg(sk=%p,sk->num=%u)\n", isk, isk->inet_num);
847
848 err = -EOPNOTSUPP;
849 if (flags & MSG_OOB)
850 goto out;
851
852 if (addr_len) {
853 if (family == AF_INET)
854 *addr_len = sizeof(*sin);
855 else if (family == AF_INET6 && addr_len)
856 *addr_len = sizeof(*sin6);
857 }
858
859 if (flags & MSG_ERRQUEUE) {
860 if (family == AF_INET) {
861 return ip_recv_error(sk, msg, len, addr_len);
862 #if IS_ENABLED(CONFIG_IPV6)
863 } else if (family == AF_INET6) {
864 return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len);
865 #endif
866 }
867 }
868
869 skb = skb_recv_datagram(sk, flags, noblock, &err);
870 if (!skb)
871 goto out;
872
873 copied = skb->len;
874 if (copied > len) {
875 msg->msg_flags |= MSG_TRUNC;
876 copied = len;
877 }
878
879 /* Don't bother checking the checksum */
880 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
881 if (err)
882 goto done;
883
884 sock_recv_timestamp(msg, sk, skb);
885
886 /* Copy the address and add cmsg data. */
887 if (family == AF_INET) {
888 sin = (struct sockaddr_in *) msg->msg_name;
889 if (sin) {
890 sin->sin_family = AF_INET;
891 sin->sin_port = 0 /* skb->h.uh->source */;
892 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
893 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
894 }
895 if (isk->cmsg_flags)
896 ip_cmsg_recv(msg, skb);
897
898 #if IS_ENABLED(CONFIG_IPV6)
899 } else if (family == AF_INET6) {
900 struct ipv6_pinfo *np = inet6_sk(sk);
901 struct ipv6hdr *ip6 = ipv6_hdr(skb);
902 sin6 = (struct sockaddr_in6 *) msg->msg_name;
903
904 if (sin6) {
905 sin6->sin6_family = AF_INET6;
906 sin6->sin6_port = 0;
907 sin6->sin6_addr = ip6->saddr;
908 sin6->sin6_flowinfo = 0;
909 if (np->sndflow)
910 sin6->sin6_flowinfo = ip6_flowinfo(ip6);
911 sin6->sin6_scope_id =
912 ipv6_iface_scope_id(&sin6->sin6_addr,
913 IP6CB(skb)->iif);
914 }
915
916 if (inet6_sk(sk)->rxopt.all)
917 pingv6_ops.ip6_datagram_recv_ctl(sk, msg, skb);
918 #endif
919 } else {
920 BUG();
921 }
922
923 err = copied;
924
925 done:
926 skb_free_datagram(sk, skb);
927 out:
928 pr_debug("ping_recvmsg -> %d\n", err);
929 return err;
930 }
931 EXPORT_SYMBOL_GPL(ping_recvmsg);
932
933 int ping_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
934 {
935 pr_debug("ping_queue_rcv_skb(sk=%p,sk->num=%d,skb=%p)\n",
936 inet_sk(sk), inet_sk(sk)->inet_num, skb);
937 if (sock_queue_rcv_skb(sk, skb) < 0) {
938 kfree_skb(skb);
939 pr_debug("ping_queue_rcv_skb -> failed\n");
940 return -1;
941 }
942 return 0;
943 }
944 EXPORT_SYMBOL_GPL(ping_queue_rcv_skb);
945
946
947 /*
948 * All we need to do is get the socket.
949 */
950
951 void ping_rcv(struct sk_buff *skb)
952 {
953 struct sock *sk;
954 struct net *net = dev_net(skb->dev);
955 struct icmphdr *icmph = icmp_hdr(skb);
956
957 /* We assume the packet has already been checked by icmp_rcv */
958
959 pr_debug("ping_rcv(skb=%p,id=%04x,seq=%04x)\n",
960 skb, ntohs(icmph->un.echo.id), ntohs(icmph->un.echo.sequence));
961
962 /* Push ICMP header back */
963 skb_push(skb, skb->data - (u8 *)icmph);
964
965 sk = ping_lookup(net, skb, ntohs(icmph->un.echo.id));
966 if (sk != NULL) {
967 #ifdef CONFIG_MTK_NET_LOGGING
968 printk(KERN_INFO "[mtk_net][ping_debug]rcv on sk %p\n", sk);
969 #endif
970 ping_queue_rcv_skb(sk, skb_get(skb));
971 /*mtk_net: don't put sock here, do sock_put after free skb*/
972 /* sock_put(sk); */
973 return;
974 }
975 pr_info("[mtk_net][ping_debug]no socket, dropping\n");
976
977 /* We're called from icmp_rcv(). kfree_skb() is done there. */
978 }
979 EXPORT_SYMBOL_GPL(ping_rcv);
980
981 struct proto ping_prot = {
982 .name = "PING",
983 .owner = THIS_MODULE,
984 .init = ping_init_sock,
985 .close = ping_close,
986 .connect = ip4_datagram_connect,
987 .disconnect = udp_disconnect,
988 .setsockopt = ip_setsockopt,
989 .getsockopt = ip_getsockopt,
990 .sendmsg = ping_v4_sendmsg,
991 .recvmsg = ping_recvmsg,
992 .bind = ping_bind,
993 .backlog_rcv = ping_queue_rcv_skb,
994 .release_cb = ip4_datagram_release_cb,
995 .hash = ping_hash,
996 .unhash = ping_unhash,
997 .get_port = ping_get_port,
998 .obj_size = sizeof(struct inet_sock),
999 };
1000 EXPORT_SYMBOL(ping_prot);
1001
1002 #ifdef CONFIG_PROC_FS
1003
1004 static struct sock *ping_get_first(struct seq_file *seq, int start)
1005 {
1006 struct sock *sk;
1007 struct ping_iter_state *state = seq->private;
1008 struct net *net = seq_file_net(seq);
1009
1010 for (state->bucket = start; state->bucket < PING_HTABLE_SIZE;
1011 ++state->bucket) {
1012 struct hlist_nulls_node *node;
1013 struct hlist_nulls_head *hslot;
1014
1015 hslot = &ping_table.hash[state->bucket];
1016
1017 if (hlist_nulls_empty(hslot))
1018 continue;
1019
1020 sk_nulls_for_each(sk, node, hslot) {
1021 if (net_eq(sock_net(sk), net) &&
1022 sk->sk_family == state->family)
1023 goto found;
1024 }
1025 }
1026 sk = NULL;
1027 found:
1028 return sk;
1029 }
1030
1031 static struct sock *ping_get_next(struct seq_file *seq, struct sock *sk)
1032 {
1033 struct ping_iter_state *state = seq->private;
1034 struct net *net = seq_file_net(seq);
1035
1036 do {
1037 sk = sk_nulls_next(sk);
1038 } while (sk && (!net_eq(sock_net(sk), net)));
1039
1040 if (!sk)
1041 return ping_get_first(seq, state->bucket + 1);
1042 return sk;
1043 }
1044
1045 static struct sock *ping_get_idx(struct seq_file *seq, loff_t pos)
1046 {
1047 struct sock *sk = ping_get_first(seq, 0);
1048
1049 if (sk)
1050 while (pos && (sk = ping_get_next(seq, sk)) != NULL)
1051 --pos;
1052 return pos ? NULL : sk;
1053 }
1054
1055 void *ping_seq_start(struct seq_file *seq, loff_t *pos, sa_family_t family)
1056 {
1057 struct ping_iter_state *state = seq->private;
1058 state->bucket = 0;
1059 state->family = family;
1060
1061 read_lock_bh(&ping_table.lock);
1062
1063 return *pos ? ping_get_idx(seq, *pos-1) : SEQ_START_TOKEN;
1064 }
1065 EXPORT_SYMBOL_GPL(ping_seq_start);
1066
1067 static void *ping_v4_seq_start(struct seq_file *seq, loff_t *pos)
1068 {
1069 return ping_seq_start(seq, pos, AF_INET);
1070 }
1071
1072 void *ping_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1073 {
1074 struct sock *sk;
1075
1076 if (v == SEQ_START_TOKEN)
1077 sk = ping_get_idx(seq, 0);
1078 else
1079 sk = ping_get_next(seq, v);
1080
1081 ++*pos;
1082 return sk;
1083 }
1084 EXPORT_SYMBOL_GPL(ping_seq_next);
1085
1086 void ping_seq_stop(struct seq_file *seq, void *v)
1087 {
1088 read_unlock_bh(&ping_table.lock);
1089 }
1090 EXPORT_SYMBOL_GPL(ping_seq_stop);
1091
1092 static void ping_v4_format_sock(struct sock *sp, struct seq_file *f,
1093 int bucket, int *len)
1094 {
1095 struct inet_sock *inet = inet_sk(sp);
1096 __be32 dest = inet->inet_daddr;
1097 __be32 src = inet->inet_rcv_saddr;
1098 __u16 destp = ntohs(inet->inet_dport);
1099 __u16 srcp = ntohs(inet->inet_sport);
1100
1101 seq_printf(f, "%5d: %08X:%04X %08X:%04X"
1102 " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %d%n",
1103 bucket, src, srcp, dest, destp, sp->sk_state,
1104 sk_wmem_alloc_get(sp),
1105 sk_rmem_alloc_get(sp),
1106 0, 0L, 0,
1107 from_kuid_munged(seq_user_ns(f), sock_i_uid(sp)),
1108 0, sock_i_ino(sp),
1109 atomic_read(&sp->sk_refcnt), sp,
1110 atomic_read(&sp->sk_drops), len);
1111 }
1112
1113 static int ping_v4_seq_show(struct seq_file *seq, void *v)
1114 {
1115 if (v == SEQ_START_TOKEN)
1116 seq_printf(seq, "%-127s\n",
1117 " sl local_address rem_address st tx_queue "
1118 "rx_queue tr tm->when retrnsmt uid timeout "
1119 "inode ref pointer drops");
1120 else {
1121 struct ping_iter_state *state = seq->private;
1122 int len;
1123
1124 ping_v4_format_sock(v, seq, state->bucket, &len);
1125 seq_printf(seq, "%*s\n", 127 - len, "");
1126 }
1127 return 0;
1128 }
1129
1130 static const struct seq_operations ping_v4_seq_ops = {
1131 .show = ping_v4_seq_show,
1132 .start = ping_v4_seq_start,
1133 .next = ping_seq_next,
1134 .stop = ping_seq_stop,
1135 };
1136
1137 static int ping_seq_open(struct inode *inode, struct file *file)
1138 {
1139 struct ping_seq_afinfo *afinfo = PDE_DATA(inode);
1140 return seq_open_net(inode, file, &afinfo->seq_ops,
1141 sizeof(struct ping_iter_state));
1142 }
1143
1144 const struct file_operations ping_seq_fops = {
1145 .open = ping_seq_open,
1146 .read = seq_read,
1147 .llseek = seq_lseek,
1148 .release = seq_release_net,
1149 };
1150 EXPORT_SYMBOL_GPL(ping_seq_fops);
1151
1152 static struct ping_seq_afinfo ping_v4_seq_afinfo = {
1153 .name = "icmp",
1154 .family = AF_INET,
1155 .seq_fops = &ping_seq_fops,
1156 .seq_ops = {
1157 .start = ping_v4_seq_start,
1158 .show = ping_v4_seq_show,
1159 .next = ping_seq_next,
1160 .stop = ping_seq_stop,
1161 },
1162 };
1163
1164 int ping_proc_register(struct net *net, struct ping_seq_afinfo *afinfo)
1165 {
1166 struct proc_dir_entry *p;
1167 p = proc_create_data(afinfo->name, S_IRUGO, net->proc_net,
1168 afinfo->seq_fops, afinfo);
1169 if (!p)
1170 return -ENOMEM;
1171 return 0;
1172 }
1173 EXPORT_SYMBOL_GPL(ping_proc_register);
1174
1175 void ping_proc_unregister(struct net *net, struct ping_seq_afinfo *afinfo)
1176 {
1177 remove_proc_entry(afinfo->name, net->proc_net);
1178 }
1179 EXPORT_SYMBOL_GPL(ping_proc_unregister);
1180
1181 static int __net_init ping_v4_proc_init_net(struct net *net)
1182 {
1183 return ping_proc_register(net, &ping_v4_seq_afinfo);
1184 }
1185
1186 static void __net_exit ping_v4_proc_exit_net(struct net *net)
1187 {
1188 ping_proc_unregister(net, &ping_v4_seq_afinfo);
1189 }
1190
1191 static struct pernet_operations ping_v4_net_ops = {
1192 .init = ping_v4_proc_init_net,
1193 .exit = ping_v4_proc_exit_net,
1194 };
1195
1196 int __init ping_proc_init(void)
1197 {
1198 return register_pernet_subsys(&ping_v4_net_ops);
1199 }
1200
1201 void ping_proc_exit(void)
1202 {
1203 unregister_pernet_subsys(&ping_v4_net_ops);
1204 }
1205
1206 #endif
1207
1208 void __init ping_init(void)
1209 {
1210 int i;
1211
1212 for (i = 0; i < PING_HTABLE_SIZE; i++)
1213 INIT_HLIST_NULLS_HEAD(&ping_table.hash[i], i);
1214 rwlock_init(&ping_table.lock);
1215 }
kernel source for telekom puls (alcatel/mediatek)