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gro: Allow tunnel stacking in the case of FOU/GUE
[linux/fpc-iii.git] / net / ipv4 / ping.c
blob3dac3d4aa26fb9b5a687939b561bd09d4de5f31a
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 u32 ping_hashfn(const struct net *net, u32 num, u32 mask)
68 {
69 u32 res = (num + net_hash_mix(net)) & mask;
70
71 pr_debug("hash(%u) = %u\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 sk_nulls_node_init(&sk->sk_nulls_node);
162 sock_put(sk);
163 isk->inet_num = 0;
164 isk->inet_sport = 0;
165 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
166 write_unlock_bh(&ping_table.lock);
167 }
168 }
169 EXPORT_SYMBOL_GPL(ping_unhash);
170
171 static struct sock *ping_lookup(struct net *net, struct sk_buff *skb, u16 ident)
172 {
173 struct hlist_nulls_head *hslot = ping_hashslot(&ping_table, net, ident);
174 struct sock *sk = NULL;
175 struct inet_sock *isk;
176 struct hlist_nulls_node *hnode;
177 int dif = skb->dev->ifindex;
178
179 if (skb->protocol == htons(ETH_P_IP)) {
180 pr_debug("try to find: num = %d, daddr = %pI4, dif = %d\n",
181 (int)ident, &ip_hdr(skb)->daddr, dif);
182 #if IS_ENABLED(CONFIG_IPV6)
183 } else if (skb->protocol == htons(ETH_P_IPV6)) {
184 pr_debug("try to find: num = %d, daddr = %pI6c, dif = %d\n",
185 (int)ident, &ipv6_hdr(skb)->daddr, dif);
186 #endif
187 }
188
189 read_lock_bh(&ping_table.lock);
190
191 ping_portaddr_for_each_entry(sk, hnode, hslot) {
192 isk = inet_sk(sk);
193
194 pr_debug("iterate\n");
195 if (isk->inet_num != ident)
196 continue;
197
198 if (skb->protocol == htons(ETH_P_IP) &&
199 sk->sk_family == AF_INET) {
200 pr_debug("found: %p: num=%d, daddr=%pI4, dif=%d\n", sk,
201 (int) isk->inet_num, &isk->inet_rcv_saddr,
202 sk->sk_bound_dev_if);
203
204 if (isk->inet_rcv_saddr &&
205 isk->inet_rcv_saddr != ip_hdr(skb)->daddr)
206 continue;
207 #if IS_ENABLED(CONFIG_IPV6)
208 } else if (skb->protocol == htons(ETH_P_IPV6) &&
209 sk->sk_family == AF_INET6) {
210
211 pr_debug("found: %p: num=%d, daddr=%pI6c, dif=%d\n", sk,
212 (int) isk->inet_num,
213 &sk->sk_v6_rcv_saddr,
214 sk->sk_bound_dev_if);
215
216 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) &&
217 !ipv6_addr_equal(&sk->sk_v6_rcv_saddr,
218 &ipv6_hdr(skb)->daddr))
219 continue;
220 #endif
221 } else {
222 continue;
223 }
224
225 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)
226 continue;
227
228 sock_hold(sk);
229 goto exit;
230 }
231
232 sk = NULL;
233 exit:
234 read_unlock_bh(&ping_table.lock);
235
236 return sk;
237 }
238
239 static void inet_get_ping_group_range_net(struct net *net, kgid_t *low,
240 kgid_t *high)
241 {
242 kgid_t *data = net->ipv4.ping_group_range.range;
243 unsigned int seq;
244
245 do {
246 seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
247
248 *low = data[0];
249 *high = data[1];
250 } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
251 }
252
253
254 int ping_init_sock(struct sock *sk)
255 {
256 struct net *net = sock_net(sk);
257 kgid_t group = current_egid();
258 struct group_info *group_info;
259 int i, j, count;
260 kgid_t low, high;
261 int ret = 0;
262
263 if (sk->sk_family == AF_INET6)
264 sk->sk_ipv6only = 1;
265
266 inet_get_ping_group_range_net(net, &low, &high);
267 if (gid_lte(low, group) && gid_lte(group, high))
268 return 0;
269
270 group_info = get_current_groups();
271 count = group_info->ngroups;
272 for (i = 0; i < group_info->nblocks; i++) {
273 int cp_count = min_t(int, NGROUPS_PER_BLOCK, count);
274 for (j = 0; j < cp_count; j++) {
275 kgid_t gid = group_info->blocks[i][j];
276 if (gid_lte(low, gid) && gid_lte(gid, high))
277 goto out_release_group;
278 }
279
280 count -= cp_count;
281 }
282
283 ret = -EACCES;
284
285 out_release_group:
286 put_group_info(group_info);
287 return ret;
288 }
289 EXPORT_SYMBOL_GPL(ping_init_sock);
290
291 void ping_close(struct sock *sk, long timeout)
292 {
293 pr_debug("ping_close(sk=%p,sk->num=%u)\n",
294 inet_sk(sk), inet_sk(sk)->inet_num);
295 pr_debug("isk->refcnt = %d\n", sk->sk_refcnt.counter);
296
297 sk_common_release(sk);
298 }
299 EXPORT_SYMBOL_GPL(ping_close);
300
301 /* Checks the bind address and possibly modifies sk->sk_bound_dev_if. */
302 static int ping_check_bind_addr(struct sock *sk, struct inet_sock *isk,
303 struct sockaddr *uaddr, int addr_len) {
304 struct net *net = sock_net(sk);
305 if (sk->sk_family == AF_INET) {
306 struct sockaddr_in *addr = (struct sockaddr_in *) uaddr;
307 int chk_addr_ret;
308
309 if (addr_len < sizeof(*addr))
310 return -EINVAL;
311
312 if (addr->sin_family != AF_INET &&
313 !(addr->sin_family == AF_UNSPEC &&
314 addr->sin_addr.s_addr == htonl(INADDR_ANY)))
315 return -EAFNOSUPPORT;
316
317 pr_debug("ping_check_bind_addr(sk=%p,addr=%pI4,port=%d)\n",
318 sk, &addr->sin_addr.s_addr, ntohs(addr->sin_port));
319
320 chk_addr_ret = inet_addr_type(net, addr->sin_addr.s_addr);
321
322 if (addr->sin_addr.s_addr == htonl(INADDR_ANY))
323 chk_addr_ret = RTN_LOCAL;
324
325 if ((net->ipv4.sysctl_ip_nonlocal_bind == 0 &&
326 isk->freebind == 0 && isk->transparent == 0 &&
327 chk_addr_ret != RTN_LOCAL) ||
328 chk_addr_ret == RTN_MULTICAST ||
329 chk_addr_ret == RTN_BROADCAST)
330 return -EADDRNOTAVAIL;
331
332 #if IS_ENABLED(CONFIG_IPV6)
333 } else if (sk->sk_family == AF_INET6) {
334 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr;
335 int addr_type, scoped, has_addr;
336 struct net_device *dev = NULL;
337
338 if (addr_len < sizeof(*addr))
339 return -EINVAL;
340
341 if (addr->sin6_family != AF_INET6)
342 return -EAFNOSUPPORT;
343
344 pr_debug("ping_check_bind_addr(sk=%p,addr=%pI6c,port=%d)\n",
345 sk, addr->sin6_addr.s6_addr, ntohs(addr->sin6_port));
346
347 addr_type = ipv6_addr_type(&addr->sin6_addr);
348 scoped = __ipv6_addr_needs_scope_id(addr_type);
349 if ((addr_type != IPV6_ADDR_ANY &&
350 !(addr_type & IPV6_ADDR_UNICAST)) ||
351 (scoped && !addr->sin6_scope_id))
352 return -EINVAL;
353
354 rcu_read_lock();
355 if (addr->sin6_scope_id) {
356 dev = dev_get_by_index_rcu(net, addr->sin6_scope_id);
357 if (!dev) {
358 rcu_read_unlock();
359 return -ENODEV;
360 }
361 }
362 has_addr = pingv6_ops.ipv6_chk_addr(net, &addr->sin6_addr, dev,
363 scoped);
364 rcu_read_unlock();
365
366 if (!(isk->freebind || isk->transparent || has_addr ||
367 addr_type == IPV6_ADDR_ANY))
368 return -EADDRNOTAVAIL;
369
370 if (scoped)
371 sk->sk_bound_dev_if = addr->sin6_scope_id;
372 #endif
373 } else {
374 return -EAFNOSUPPORT;
375 }
376 return 0;
377 }
378
379 static void ping_set_saddr(struct sock *sk, struct sockaddr *saddr)
380 {
381 if (saddr->sa_family == AF_INET) {
382 struct inet_sock *isk = inet_sk(sk);
383 struct sockaddr_in *addr = (struct sockaddr_in *) saddr;
384 isk->inet_rcv_saddr = isk->inet_saddr = addr->sin_addr.s_addr;
385 #if IS_ENABLED(CONFIG_IPV6)
386 } else if (saddr->sa_family == AF_INET6) {
387 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) saddr;
388 struct ipv6_pinfo *np = inet6_sk(sk);
389 sk->sk_v6_rcv_saddr = np->saddr = addr->sin6_addr;
390 #endif
391 }
392 }
393
394 static void ping_clear_saddr(struct sock *sk, int dif)
395 {
396 sk->sk_bound_dev_if = dif;
397 if (sk->sk_family == AF_INET) {
398 struct inet_sock *isk = inet_sk(sk);
399 isk->inet_rcv_saddr = isk->inet_saddr = 0;
400 #if IS_ENABLED(CONFIG_IPV6)
401 } else if (sk->sk_family == AF_INET6) {
402 struct ipv6_pinfo *np = inet6_sk(sk);
403 memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr));
404 memset(&np->saddr, 0, sizeof(np->saddr));
405 #endif
406 }
407 }
408 /*
409 * We need our own bind because there are no privileged id's == local ports.
410 * Moreover, we don't allow binding to multi- and broadcast addresses.
411 */
412
413 int ping_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
414 {
415 struct inet_sock *isk = inet_sk(sk);
416 unsigned short snum;
417 int err;
418 int dif = sk->sk_bound_dev_if;
419
420 err = ping_check_bind_addr(sk, isk, uaddr, addr_len);
421 if (err)
422 return err;
423
424 lock_sock(sk);
425
426 err = -EINVAL;
427 if (isk->inet_num != 0)
428 goto out;
429
430 err = -EADDRINUSE;
431 ping_set_saddr(sk, uaddr);
432 snum = ntohs(((struct sockaddr_in *)uaddr)->sin_port);
433 if (ping_get_port(sk, snum) != 0) {
434 ping_clear_saddr(sk, dif);
435 goto out;
436 }
437
438 pr_debug("after bind(): num = %d, dif = %d\n",
439 (int)isk->inet_num,
440 (int)sk->sk_bound_dev_if);
441
442 err = 0;
443 if (sk->sk_family == AF_INET && isk->inet_rcv_saddr)
444 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
445 #if IS_ENABLED(CONFIG_IPV6)
446 if (sk->sk_family == AF_INET6 && !ipv6_addr_any(&sk->sk_v6_rcv_saddr))
447 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
448 #endif
449
450 if (snum)
451 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
452 isk->inet_sport = htons(isk->inet_num);
453 isk->inet_daddr = 0;
454 isk->inet_dport = 0;
455
456 #if IS_ENABLED(CONFIG_IPV6)
457 if (sk->sk_family == AF_INET6)
458 memset(&sk->sk_v6_daddr, 0, sizeof(sk->sk_v6_daddr));
459 #endif
460
461 sk_dst_reset(sk);
462 out:
463 release_sock(sk);
464 pr_debug("ping_v4_bind -> %d\n", err);
465 return err;
466 }
467 EXPORT_SYMBOL_GPL(ping_bind);
468
469 /*
470 * Is this a supported type of ICMP message?
471 */
472
473 static inline int ping_supported(int family, int type, int code)
474 {
475 return (family == AF_INET && type == ICMP_ECHO && code == 0) ||
476 (family == AF_INET6 && type == ICMPV6_ECHO_REQUEST && code == 0);
477 }
478
479 /*
480 * This routine is called by the ICMP module when it gets some
481 * sort of error condition.
482 */
483
484 void ping_err(struct sk_buff *skb, int offset, u32 info)
485 {
486 int family;
487 struct icmphdr *icmph;
488 struct inet_sock *inet_sock;
489 int type;
490 int code;
491 struct net *net = dev_net(skb->dev);
492 struct sock *sk;
493 int harderr;
494 int err;
495
496 if (skb->protocol == htons(ETH_P_IP)) {
497 family = AF_INET;
498 type = icmp_hdr(skb)->type;
499 code = icmp_hdr(skb)->code;
500 icmph = (struct icmphdr *)(skb->data + offset);
501 } else if (skb->protocol == htons(ETH_P_IPV6)) {
502 family = AF_INET6;
503 type = icmp6_hdr(skb)->icmp6_type;
504 code = icmp6_hdr(skb)->icmp6_code;
505 icmph = (struct icmphdr *) (skb->data + offset);
506 } else {
507 BUG();
508 }
509
510 /* We assume the packet has already been checked by icmp_unreach */
511
512 if (!ping_supported(family, icmph->type, icmph->code))
513 return;
514
515 pr_debug("ping_err(proto=0x%x,type=%d,code=%d,id=%04x,seq=%04x)\n",
516 skb->protocol, type, code, ntohs(icmph->un.echo.id),
517 ntohs(icmph->un.echo.sequence));
518
519 sk = ping_lookup(net, skb, ntohs(icmph->un.echo.id));
520 if (!sk) {
521 pr_debug("no socket, dropping\n");
522 return; /* No socket for error */
523 }
524 pr_debug("err on socket %p\n", sk);
525
526 err = 0;
527 harderr = 0;
528 inet_sock = inet_sk(sk);
529
530 if (skb->protocol == htons(ETH_P_IP)) {
531 switch (type) {
532 default:
533 case ICMP_TIME_EXCEEDED:
534 err = EHOSTUNREACH;
535 break;
536 case ICMP_SOURCE_QUENCH:
537 /* This is not a real error but ping wants to see it.
538 * Report it with some fake errno.
539 */
540 err = EREMOTEIO;
541 break;
542 case ICMP_PARAMETERPROB:
543 err = EPROTO;
544 harderr = 1;
545 break;
546 case ICMP_DEST_UNREACH:
547 if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */
548 ipv4_sk_update_pmtu(skb, sk, info);
549 if (inet_sock->pmtudisc != IP_PMTUDISC_DONT) {
550 err = EMSGSIZE;
551 harderr = 1;
552 break;
553 }
554 goto out;
555 }
556 err = EHOSTUNREACH;
557 if (code <= NR_ICMP_UNREACH) {
558 harderr = icmp_err_convert[code].fatal;
559 err = icmp_err_convert[code].errno;
560 }
561 break;
562 case ICMP_REDIRECT:
563 /* See ICMP_SOURCE_QUENCH */
564 ipv4_sk_redirect(skb, sk);
565 err = EREMOTEIO;
566 break;
567 }
568 #if IS_ENABLED(CONFIG_IPV6)
569 } else if (skb->protocol == htons(ETH_P_IPV6)) {
570 harderr = pingv6_ops.icmpv6_err_convert(type, code, &err);
571 #endif
572 }
573
574 /*
575 * RFC1122: OK. Passes ICMP errors back to application, as per
576 * 4.1.3.3.
577 */
578 if ((family == AF_INET && !inet_sock->recverr) ||
579 (family == AF_INET6 && !inet6_sk(sk)->recverr)) {
580 if (!harderr || sk->sk_state != TCP_ESTABLISHED)
581 goto out;
582 } else {
583 if (family == AF_INET) {
584 ip_icmp_error(sk, skb, err, 0 /* no remote port */,
585 info, (u8 *)icmph);
586 #if IS_ENABLED(CONFIG_IPV6)
587 } else if (family == AF_INET6) {
588 pingv6_ops.ipv6_icmp_error(sk, skb, err, 0,
589 info, (u8 *)icmph);
590 #endif
591 }
592 }
593 sk->sk_err = err;
594 sk->sk_error_report(sk);
595 out:
596 sock_put(sk);
597 }
598 EXPORT_SYMBOL_GPL(ping_err);
599
600 /*
601 * Copy and checksum an ICMP Echo packet from user space into a buffer
602 * starting from the payload.
603 */
604
605 int ping_getfrag(void *from, char *to,
606 int offset, int fraglen, int odd, struct sk_buff *skb)
607 {
608 struct pingfakehdr *pfh = (struct pingfakehdr *)from;
609
610 if (offset == 0) {
611 fraglen -= sizeof(struct icmphdr);
612 if (fraglen < 0)
613 BUG();
614 if (csum_and_copy_from_iter(to + sizeof(struct icmphdr),
615 fraglen, &pfh->wcheck,
616 &pfh->msg->msg_iter) != fraglen)
617 return -EFAULT;
618 } else if (offset < sizeof(struct icmphdr)) {
619 BUG();
620 } else {
621 if (csum_and_copy_from_iter(to, fraglen, &pfh->wcheck,
622 &pfh->msg->msg_iter) != fraglen)
623 return -EFAULT;
624 }
625
626 #if IS_ENABLED(CONFIG_IPV6)
627 /* For IPv6, checksum each skb as we go along, as expected by
628 * icmpv6_push_pending_frames. For IPv4, accumulate the checksum in
629 * wcheck, it will be finalized in ping_v4_push_pending_frames.
630 */
631 if (pfh->family == AF_INET6) {
632 skb->csum = pfh->wcheck;
633 skb->ip_summed = CHECKSUM_NONE;
634 pfh->wcheck = 0;
635 }
636 #endif
637
638 return 0;
639 }
640 EXPORT_SYMBOL_GPL(ping_getfrag);
641
642 static int ping_v4_push_pending_frames(struct sock *sk, struct pingfakehdr *pfh,
643 struct flowi4 *fl4)
644 {
645 struct sk_buff *skb = skb_peek(&sk->sk_write_queue);
646
647 pfh->wcheck = csum_partial((char *)&pfh->icmph,
648 sizeof(struct icmphdr), pfh->wcheck);
649 pfh->icmph.checksum = csum_fold(pfh->wcheck);
650 memcpy(icmp_hdr(skb), &pfh->icmph, sizeof(struct icmphdr));
651 skb->ip_summed = CHECKSUM_NONE;
652 return ip_push_pending_frames(sk, fl4);
653 }
654
655 int ping_common_sendmsg(int family, struct msghdr *msg, size_t len,
656 void *user_icmph, size_t icmph_len) {
657 u8 type, code;
658
659 if (len > 0xFFFF)
660 return -EMSGSIZE;
661
662 /* Must have at least a full ICMP header. */
663 if (len < icmph_len)
664 return -EINVAL;
665
666 /*
667 * Check the flags.
668 */
669
670 /* Mirror BSD error message compatibility */
671 if (msg->msg_flags & MSG_OOB)
672 return -EOPNOTSUPP;
673
674 /*
675 * Fetch the ICMP header provided by the userland.
676 * iovec is modified! The ICMP header is consumed.
677 */
678 if (memcpy_from_msg(user_icmph, msg, icmph_len))
679 return -EFAULT;
680
681 if (family == AF_INET) {
682 type = ((struct icmphdr *) user_icmph)->type;
683 code = ((struct icmphdr *) user_icmph)->code;
684 #if IS_ENABLED(CONFIG_IPV6)
685 } else if (family == AF_INET6) {
686 type = ((struct icmp6hdr *) user_icmph)->icmp6_type;
687 code = ((struct icmp6hdr *) user_icmph)->icmp6_code;
688 #endif
689 } else {
690 BUG();
691 }
692
693 if (!ping_supported(family, type, code))
694 return -EINVAL;
695
696 return 0;
697 }
698 EXPORT_SYMBOL_GPL(ping_common_sendmsg);
699
700 static int ping_v4_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
701 {
702 struct net *net = sock_net(sk);
703 struct flowi4 fl4;
704 struct inet_sock *inet = inet_sk(sk);
705 struct ipcm_cookie ipc;
706 struct icmphdr user_icmph;
707 struct pingfakehdr pfh;
708 struct rtable *rt = NULL;
709 struct ip_options_data opt_copy;
710 int free = 0;
711 __be32 saddr, daddr, faddr;
712 u8 tos;
713 int err;
714
715 pr_debug("ping_v4_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num);
716
717 err = ping_common_sendmsg(AF_INET, msg, len, &user_icmph,
718 sizeof(user_icmph));
719 if (err)
720 return err;
721
722 /*
723 * Get and verify the address.
724 */
725
726 if (msg->msg_name) {
727 DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name);
728 if (msg->msg_namelen < sizeof(*usin))
729 return -EINVAL;
730 if (usin->sin_family != AF_INET)
731 return -EAFNOSUPPORT;
732 daddr = usin->sin_addr.s_addr;
733 /* no remote port */
734 } else {
735 if (sk->sk_state != TCP_ESTABLISHED)
736 return -EDESTADDRREQ;
737 daddr = inet->inet_daddr;
738 /* no remote port */
739 }
740
741 ipc.addr = inet->inet_saddr;
742 ipc.opt = NULL;
743 ipc.oif = sk->sk_bound_dev_if;
744 ipc.tx_flags = 0;
745 ipc.ttl = 0;
746 ipc.tos = -1;
747
748 sock_tx_timestamp(sk, &ipc.tx_flags);
749
750 if (msg->msg_controllen) {
751 err = ip_cmsg_send(sock_net(sk), msg, &ipc, false);
752 if (unlikely(err)) {
753 kfree(ipc.opt);
754 return err;
755 }
756 if (ipc.opt)
757 free = 1;
758 }
759 if (!ipc.opt) {
760 struct ip_options_rcu *inet_opt;
761
762 rcu_read_lock();
763 inet_opt = rcu_dereference(inet->inet_opt);
764 if (inet_opt) {
765 memcpy(&opt_copy, inet_opt,
766 sizeof(*inet_opt) + inet_opt->opt.optlen);
767 ipc.opt = &opt_copy.opt;
768 }
769 rcu_read_unlock();
770 }
771
772 saddr = ipc.addr;
773 ipc.addr = faddr = daddr;
774
775 if (ipc.opt && ipc.opt->opt.srr) {
776 if (!daddr)
777 return -EINVAL;
778 faddr = ipc.opt->opt.faddr;
779 }
780 tos = get_rttos(&ipc, inet);
781 if (sock_flag(sk, SOCK_LOCALROUTE) ||
782 (msg->msg_flags & MSG_DONTROUTE) ||
783 (ipc.opt && ipc.opt->opt.is_strictroute)) {
784 tos |= RTO_ONLINK;
785 }
786
787 if (ipv4_is_multicast(daddr)) {
788 if (!ipc.oif)
789 ipc.oif = inet->mc_index;
790 if (!saddr)
791 saddr = inet->mc_addr;
792 } else if (!ipc.oif)
793 ipc.oif = inet->uc_index;
794
795 flowi4_init_output(&fl4, ipc.oif, sk->sk_mark, tos,
796 RT_SCOPE_UNIVERSE, sk->sk_protocol,
797 inet_sk_flowi_flags(sk), faddr, saddr, 0, 0);
798
799 security_sk_classify_flow(sk, flowi4_to_flowi(&fl4));
800 rt = ip_route_output_flow(net, &fl4, sk);
801 if (IS_ERR(rt)) {
802 err = PTR_ERR(rt);
803 rt = NULL;
804 if (err == -ENETUNREACH)
805 IP_INC_STATS(net, IPSTATS_MIB_OUTNOROUTES);
806 goto out;
807 }
808
809 err = -EACCES;
810 if ((rt->rt_flags & RTCF_BROADCAST) &&
811 !sock_flag(sk, SOCK_BROADCAST))
812 goto out;
813
814 if (msg->msg_flags & MSG_CONFIRM)
815 goto do_confirm;
816 back_from_confirm:
817
818 if (!ipc.addr)
819 ipc.addr = fl4.daddr;
820
821 lock_sock(sk);
822
823 pfh.icmph.type = user_icmph.type; /* already checked */
824 pfh.icmph.code = user_icmph.code; /* ditto */
825 pfh.icmph.checksum = 0;
826 pfh.icmph.un.echo.id = inet->inet_sport;
827 pfh.icmph.un.echo.sequence = user_icmph.un.echo.sequence;
828 pfh.msg = msg;
829 pfh.wcheck = 0;
830 pfh.family = AF_INET;
831
832 err = ip_append_data(sk, &fl4, ping_getfrag, &pfh, len,
833 0, &ipc, &rt, msg->msg_flags);
834 if (err)
835 ip_flush_pending_frames(sk);
836 else
837 err = ping_v4_push_pending_frames(sk, &pfh, &fl4);
838 release_sock(sk);
839
840 out:
841 ip_rt_put(rt);
842 if (free)
843 kfree(ipc.opt);
844 if (!err) {
845 icmp_out_count(sock_net(sk), user_icmph.type);
846 return len;
847 }
848 return err;
849
850 do_confirm:
851 dst_confirm(&rt->dst);
852 if (!(msg->msg_flags & MSG_PROBE) || len)
853 goto back_from_confirm;
854 err = 0;
855 goto out;
856 }
857
858 int ping_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int noblock,
859 int flags, int *addr_len)
860 {
861 struct inet_sock *isk = inet_sk(sk);
862 int family = sk->sk_family;
863 struct sk_buff *skb;
864 int copied, err;
865
866 pr_debug("ping_recvmsg(sk=%p,sk->num=%u)\n", isk, isk->inet_num);
867
868 err = -EOPNOTSUPP;
869 if (flags & MSG_OOB)
870 goto out;
871
872 if (flags & MSG_ERRQUEUE)
873 return inet_recv_error(sk, msg, len, addr_len);
874
875 skb = skb_recv_datagram(sk, flags, noblock, &err);
876 if (!skb)
877 goto out;
878
879 copied = skb->len;
880 if (copied > len) {
881 msg->msg_flags |= MSG_TRUNC;
882 copied = len;
883 }
884
885 /* Don't bother checking the checksum */
886 err = skb_copy_datagram_msg(skb, 0, msg, copied);
887 if (err)
888 goto done;
889
890 sock_recv_timestamp(msg, sk, skb);
891
892 /* Copy the address and add cmsg data. */
893 if (family == AF_INET) {
894 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
895
896 if (sin) {
897 sin->sin_family = AF_INET;
898 sin->sin_port = 0 /* skb->h.uh->source */;
899 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
900 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
901 *addr_len = sizeof(*sin);
902 }
903
904 if (isk->cmsg_flags)
905 ip_cmsg_recv(msg, skb);
906
907 #if IS_ENABLED(CONFIG_IPV6)
908 } else if (family == AF_INET6) {
909 struct ipv6_pinfo *np = inet6_sk(sk);
910 struct ipv6hdr *ip6 = ipv6_hdr(skb);
911 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
912
913 if (sin6) {
914 sin6->sin6_family = AF_INET6;
915 sin6->sin6_port = 0;
916 sin6->sin6_addr = ip6->saddr;
917 sin6->sin6_flowinfo = 0;
918 if (np->sndflow)
919 sin6->sin6_flowinfo = ip6_flowinfo(ip6);
920 sin6->sin6_scope_id =
921 ipv6_iface_scope_id(&sin6->sin6_addr,
922 inet6_iif(skb));
923 *addr_len = sizeof(*sin6);
924 }
925
926 if (inet6_sk(sk)->rxopt.all)
927 pingv6_ops.ip6_datagram_recv_common_ctl(sk, msg, skb);
928 if (skb->protocol == htons(ETH_P_IPV6) &&
929 inet6_sk(sk)->rxopt.all)
930 pingv6_ops.ip6_datagram_recv_specific_ctl(sk, msg, skb);
931 else if (skb->protocol == htons(ETH_P_IP) && isk->cmsg_flags)
932 ip_cmsg_recv(msg, skb);
933 #endif
934 } else {
935 BUG();
936 }
937
938 err = copied;
939
940 done:
941 skb_free_datagram(sk, skb);
942 out:
943 pr_debug("ping_recvmsg -> %d\n", err);
944 return err;
945 }
946 EXPORT_SYMBOL_GPL(ping_recvmsg);
947
948 int ping_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
949 {
950 pr_debug("ping_queue_rcv_skb(sk=%p,sk->num=%d,skb=%p)\n",
951 inet_sk(sk), inet_sk(sk)->inet_num, skb);
952 if (sock_queue_rcv_skb(sk, skb) < 0) {
953 kfree_skb(skb);
954 pr_debug("ping_queue_rcv_skb -> failed\n");
955 return -1;
956 }
957 return 0;
958 }
959 EXPORT_SYMBOL_GPL(ping_queue_rcv_skb);
960
961
962 /*
963 * All we need to do is get the socket.
964 */
965
966 bool ping_rcv(struct sk_buff *skb)
967 {
968 struct sock *sk;
969 struct net *net = dev_net(skb->dev);
970 struct icmphdr *icmph = icmp_hdr(skb);
971
972 /* We assume the packet has already been checked by icmp_rcv */
973
974 pr_debug("ping_rcv(skb=%p,id=%04x,seq=%04x)\n",
975 skb, ntohs(icmph->un.echo.id), ntohs(icmph->un.echo.sequence));
976
977 /* Push ICMP header back */
978 skb_push(skb, skb->data - (u8 *)icmph);
979
980 sk = ping_lookup(net, skb, ntohs(icmph->un.echo.id));
981 if (sk) {
982 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
983
984 pr_debug("rcv on socket %p\n", sk);
985 if (skb2)
986 ping_queue_rcv_skb(sk, skb2);
987 sock_put(sk);
988 return true;
989 }
990 pr_debug("no socket, dropping\n");
991
992 return false;
993 }
994 EXPORT_SYMBOL_GPL(ping_rcv);
995
996 struct proto ping_prot = {
997 .name = "PING",
998 .owner = THIS_MODULE,
999 .init = ping_init_sock,
1000 .close = ping_close,
1001 .connect = ip4_datagram_connect,
1002 .disconnect = udp_disconnect,
1003 .setsockopt = ip_setsockopt,
1004 .getsockopt = ip_getsockopt,
1005 .sendmsg = ping_v4_sendmsg,
1006 .recvmsg = ping_recvmsg,
1007 .bind = ping_bind,
1008 .backlog_rcv = ping_queue_rcv_skb,
1009 .release_cb = ip4_datagram_release_cb,
1010 .hash = ping_hash,
1011 .unhash = ping_unhash,
1012 .get_port = ping_get_port,
1013 .obj_size = sizeof(struct inet_sock),
1014 };
1015 EXPORT_SYMBOL(ping_prot);
1016
1017 #ifdef CONFIG_PROC_FS
1018
1019 static struct sock *ping_get_first(struct seq_file *seq, int start)
1020 {
1021 struct sock *sk;
1022 struct ping_iter_state *state = seq->private;
1023 struct net *net = seq_file_net(seq);
1024
1025 for (state->bucket = start; state->bucket < PING_HTABLE_SIZE;
1026 ++state->bucket) {
1027 struct hlist_nulls_node *node;
1028 struct hlist_nulls_head *hslot;
1029
1030 hslot = &ping_table.hash[state->bucket];
1031
1032 if (hlist_nulls_empty(hslot))
1033 continue;
1034
1035 sk_nulls_for_each(sk, node, hslot) {
1036 if (net_eq(sock_net(sk), net) &&
1037 sk->sk_family == state->family)
1038 goto found;
1039 }
1040 }
1041 sk = NULL;
1042 found:
1043 return sk;
1044 }
1045
1046 static struct sock *ping_get_next(struct seq_file *seq, struct sock *sk)
1047 {
1048 struct ping_iter_state *state = seq->private;
1049 struct net *net = seq_file_net(seq);
1050
1051 do {
1052 sk = sk_nulls_next(sk);
1053 } while (sk && (!net_eq(sock_net(sk), net)));
1054
1055 if (!sk)
1056 return ping_get_first(seq, state->bucket + 1);
1057 return sk;
1058 }
1059
1060 static struct sock *ping_get_idx(struct seq_file *seq, loff_t pos)
1061 {
1062 struct sock *sk = ping_get_first(seq, 0);
1063
1064 if (sk)
1065 while (pos && (sk = ping_get_next(seq, sk)) != NULL)
1066 --pos;
1067 return pos ? NULL : sk;
1068 }
1069
1070 void *ping_seq_start(struct seq_file *seq, loff_t *pos, sa_family_t family)
1071 {
1072 struct ping_iter_state *state = seq->private;
1073 state->bucket = 0;
1074 state->family = family;
1075
1076 read_lock_bh(&ping_table.lock);
1077
1078 return *pos ? ping_get_idx(seq, *pos-1) : SEQ_START_TOKEN;
1079 }
1080 EXPORT_SYMBOL_GPL(ping_seq_start);
1081
1082 static void *ping_v4_seq_start(struct seq_file *seq, loff_t *pos)
1083 {
1084 return ping_seq_start(seq, pos, AF_INET);
1085 }
1086
1087 void *ping_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1088 {
1089 struct sock *sk;
1090
1091 if (v == SEQ_START_TOKEN)
1092 sk = ping_get_idx(seq, 0);
1093 else
1094 sk = ping_get_next(seq, v);
1095
1096 ++*pos;
1097 return sk;
1098 }
1099 EXPORT_SYMBOL_GPL(ping_seq_next);
1100
1101 void ping_seq_stop(struct seq_file *seq, void *v)
1102 {
1103 read_unlock_bh(&ping_table.lock);
1104 }
1105 EXPORT_SYMBOL_GPL(ping_seq_stop);
1106
1107 static void ping_v4_format_sock(struct sock *sp, struct seq_file *f,
1108 int bucket)
1109 {
1110 struct inet_sock *inet = inet_sk(sp);
1111 __be32 dest = inet->inet_daddr;
1112 __be32 src = inet->inet_rcv_saddr;
1113 __u16 destp = ntohs(inet->inet_dport);
1114 __u16 srcp = ntohs(inet->inet_sport);
1115
1116 seq_printf(f, "%5d: %08X:%04X %08X:%04X"
1117 " %02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d",
1118 bucket, src, srcp, dest, destp, sp->sk_state,
1119 sk_wmem_alloc_get(sp),
1120 sk_rmem_alloc_get(sp),
1121 0, 0L, 0,
1122 from_kuid_munged(seq_user_ns(f), sock_i_uid(sp)),
1123 0, sock_i_ino(sp),
1124 atomic_read(&sp->sk_refcnt), sp,
1125 atomic_read(&sp->sk_drops));
1126 }
1127
1128 static int ping_v4_seq_show(struct seq_file *seq, void *v)
1129 {
1130 seq_setwidth(seq, 127);
1131 if (v == SEQ_START_TOKEN)
1132 seq_puts(seq, " sl local_address rem_address st tx_queue "
1133 "rx_queue tr tm->when retrnsmt uid timeout "
1134 "inode ref pointer drops");
1135 else {
1136 struct ping_iter_state *state = seq->private;
1137
1138 ping_v4_format_sock(v, seq, state->bucket);
1139 }
1140 seq_pad(seq, '\n');
1141 return 0;
1142 }
1143
1144 static const struct seq_operations ping_v4_seq_ops = {
1145 .show = ping_v4_seq_show,
1146 .start = ping_v4_seq_start,
1147 .next = ping_seq_next,
1148 .stop = ping_seq_stop,
1149 };
1150
1151 static int ping_seq_open(struct inode *inode, struct file *file)
1152 {
1153 struct ping_seq_afinfo *afinfo = PDE_DATA(inode);
1154 return seq_open_net(inode, file, &afinfo->seq_ops,
1155 sizeof(struct ping_iter_state));
1156 }
1157
1158 const struct file_operations ping_seq_fops = {
1159 .open = ping_seq_open,
1160 .read = seq_read,
1161 .llseek = seq_lseek,
1162 .release = seq_release_net,
1163 };
1164 EXPORT_SYMBOL_GPL(ping_seq_fops);
1165
1166 static struct ping_seq_afinfo ping_v4_seq_afinfo = {
1167 .name = "icmp",
1168 .family = AF_INET,
1169 .seq_fops = &ping_seq_fops,
1170 .seq_ops = {
1171 .start = ping_v4_seq_start,
1172 .show = ping_v4_seq_show,
1173 .next = ping_seq_next,
1174 .stop = ping_seq_stop,
1175 },
1176 };
1177
1178 int ping_proc_register(struct net *net, struct ping_seq_afinfo *afinfo)
1179 {
1180 struct proc_dir_entry *p;
1181 p = proc_create_data(afinfo->name, S_IRUGO, net->proc_net,
1182 afinfo->seq_fops, afinfo);
1183 if (!p)
1184 return -ENOMEM;
1185 return 0;
1186 }
1187 EXPORT_SYMBOL_GPL(ping_proc_register);
1188
1189 void ping_proc_unregister(struct net *net, struct ping_seq_afinfo *afinfo)
1190 {
1191 remove_proc_entry(afinfo->name, net->proc_net);
1192 }
1193 EXPORT_SYMBOL_GPL(ping_proc_unregister);
1194
1195 static int __net_init ping_v4_proc_init_net(struct net *net)
1196 {
1197 return ping_proc_register(net, &ping_v4_seq_afinfo);
1198 }
1199
1200 static void __net_exit ping_v4_proc_exit_net(struct net *net)
1201 {
1202 ping_proc_unregister(net, &ping_v4_seq_afinfo);
1203 }
1204
1205 static struct pernet_operations ping_v4_net_ops = {
1206 .init = ping_v4_proc_init_net,
1207 .exit = ping_v4_proc_exit_net,
1208 };
1209
1210 int __init ping_proc_init(void)
1211 {
1212 return register_pernet_subsys(&ping_v4_net_ops);
1213 }
1214
1215 void ping_proc_exit(void)
1216 {
1217 unregister_pernet_subsys(&ping_v4_net_ops);
1218 }
1219
1220 #endif
1221
1222 void __init ping_init(void)
1223 {
1224 int i;
1225
1226 for (i = 0; i < PING_HTABLE_SIZE; i++)
1227 INIT_HLIST_NULLS_HEAD(&ping_table.hash[i], i);
1228 rwlock_init(&ping_table.lock);
1229 }
Linux with added FPC-III support