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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
56struct ping_table {
57 struct hlist_nulls_head hash[PING_HTABLE_SIZE];
58 rwlock_t lock;
59};
60
61static struct ping_table ping_table;
62struct pingv6_ops pingv6_ops;
63EXPORT_SYMBOL_GPL(pingv6_ops);
64
65static u16 ping_port_rover;
66
67static 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}
74EXPORT_SYMBOL_GPL(ping_hash);
75
76static 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
82int 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++;
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
108 ping_port_rover = ident = result;
109 break;
110next_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
121
122
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
142fail:
143 write_unlock_bh(&ping_table.lock);
144 return 1;
145}
146EXPORT_SYMBOL_GPL(ping_get_port);
147
148int ping_hash(struct sock *sk)
149{
150 pr_debug("ping_hash(sk->port=%u)\n", inet_sk(sk)->inet_num);
151 BUG();
152
153 return 0;
154}
155
156void ping_unhash(struct sock *sk)
157{
158 struct inet_sock *isk = inet_sk(sk);
159
160 pr_debug("ping_unhash(isk=%p,isk->num=%u)\n", isk, isk->inet_num);
161 write_lock_bh(&ping_table.lock);
162 if (sk_hashed(sk)) {
163 hlist_nulls_del(&sk->sk_nulls_node);
164 sk_nulls_node_init(&sk->sk_nulls_node);
165 sock_put(sk);
166 isk->inet_num = 0;
167 isk->inet_sport = 0;
168 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
169 }
170 write_unlock_bh(&ping_table.lock);
171}
172EXPORT_SYMBOL_GPL(ping_unhash);
173
174static struct sock *ping_lookup(struct net *net, struct sk_buff *skb, u16 ident)
175{
176 struct hlist_nulls_head *hslot = ping_hashslot(&ping_table, net, ident);
177 struct sock *sk = NULL;
178 struct inet_sock *isk;
179 struct hlist_nulls_node *hnode;
180 int dif = skb->dev->ifindex;
181
182 if (skb->protocol == htons(ETH_P_IP)) {
183 pr_debug("try to find: num = %d, daddr = %pI4, dif = %d\n",
184 (int)ident, &ip_hdr(skb)->daddr, dif);
185#if IS_ENABLED(CONFIG_IPV6)
186 } else if (skb->protocol == htons(ETH_P_IPV6)) {
187 pr_debug("try to find: num = %d, daddr = %pI6c, dif = %d\n",
188 (int)ident, &ipv6_hdr(skb)->daddr, dif);
189#endif
190 }
191
192 read_lock_bh(&ping_table.lock);
193
194 ping_portaddr_for_each_entry(sk, hnode, hslot) {
195 isk = inet_sk(sk);
196
197 pr_debug("iterate\n");
198 if (isk->inet_num != ident)
199 continue;
200
201 if (skb->protocol == htons(ETH_P_IP) &&
202 sk->sk_family == AF_INET) {
203 pr_debug("found: %p: num=%d, daddr=%pI4, dif=%d\n", sk,
204 (int) isk->inet_num, &isk->inet_rcv_saddr,
205 sk->sk_bound_dev_if);
206
207 if (isk->inet_rcv_saddr &&
208 isk->inet_rcv_saddr != ip_hdr(skb)->daddr)
209 continue;
210#if IS_ENABLED(CONFIG_IPV6)
211 } else if (skb->protocol == htons(ETH_P_IPV6) &&
212 sk->sk_family == AF_INET6) {
213
214 pr_debug("found: %p: num=%d, daddr=%pI6c, dif=%d\n", sk,
215 (int) isk->inet_num,
216 &sk->sk_v6_rcv_saddr,
217 sk->sk_bound_dev_if);
218
219 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) &&
220 !ipv6_addr_equal(&sk->sk_v6_rcv_saddr,
221 &ipv6_hdr(skb)->daddr))
222 continue;
223#endif
224 } else {
225 continue;
226 }
227
228 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)
229 continue;
230
231 sock_hold(sk);
232 goto exit;
233 }
234
235 sk = NULL;
236exit:
237 read_unlock_bh(&ping_table.lock);
238
239 return sk;
240}
241
242static void inet_get_ping_group_range_net(struct net *net, kgid_t *low,
243 kgid_t *high)
244{
245 kgid_t *data = net->ipv4.ping_group_range.range;
246 unsigned int seq;
247
248 do {
249 seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
250
251 *low = data[0];
252 *high = data[1];
253 } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
254}
255
256
257int ping_init_sock(struct sock *sk)
258{
259 struct net *net = sock_net(sk);
260 kgid_t group = current_egid();
261 struct group_info *group_info;
262 int i;
263 kgid_t low, high;
264 int ret = 0;
265
266 if (sk->sk_family == AF_INET6)
267 sk->sk_ipv6only = 1;
268
269 inet_get_ping_group_range_net(net, &low, &high);
270 if (gid_lte(low, group) && gid_lte(group, high))
271 return 0;
272
273 group_info = get_current_groups();
274 for (i = 0; i < group_info->ngroups; i++) {
275 kgid_t gid = group_info->gid[i];
276
277 if (gid_lte(low, gid) && gid_lte(gid, high))
278 goto out_release_group;
279 }
280
281 ret = -EACCES;
282
283out_release_group:
284 put_group_info(group_info);
285 return ret;
286}
287EXPORT_SYMBOL_GPL(ping_init_sock);
288
289void ping_close(struct sock *sk, long timeout)
290{
291 pr_debug("ping_close(sk=%p,sk->num=%u)\n",
292 inet_sk(sk), inet_sk(sk)->inet_num);
293 pr_debug("isk->refcnt = %d\n", refcount_read(&sk->sk_refcnt));
294
295 sk_common_release(sk);
296}
297EXPORT_SYMBOL_GPL(ping_close);
298
299
300static int ping_check_bind_addr(struct sock *sk, struct inet_sock *isk,
301 struct sockaddr *uaddr, int addr_len) {
302 struct net *net = sock_net(sk);
303 if (sk->sk_family == AF_INET) {
304 struct sockaddr_in *addr = (struct sockaddr_in *) uaddr;
305 int chk_addr_ret;
306
307 if (addr_len < sizeof(*addr))
308 return -EINVAL;
309
310 if (addr->sin_family != AF_INET &&
311 !(addr->sin_family == AF_UNSPEC &&
312 addr->sin_addr.s_addr == htonl(INADDR_ANY)))
313 return -EAFNOSUPPORT;
314
315 pr_debug("ping_check_bind_addr(sk=%p,addr=%pI4,port=%d)\n",
316 sk, &addr->sin_addr.s_addr, ntohs(addr->sin_port));
317
318 chk_addr_ret = inet_addr_type(net, addr->sin_addr.s_addr);
319
320 if (addr->sin_addr.s_addr == htonl(INADDR_ANY))
321 chk_addr_ret = RTN_LOCAL;
322
323 if ((net->ipv4.sysctl_ip_nonlocal_bind == 0 &&
324 isk->freebind == 0 && isk->transparent == 0 &&
325 chk_addr_ret != RTN_LOCAL) ||
326 chk_addr_ret == RTN_MULTICAST ||
327 chk_addr_ret == RTN_BROADCAST)
328 return -EADDRNOTAVAIL;
329
330#if IS_ENABLED(CONFIG_IPV6)
331 } else if (sk->sk_family == AF_INET6) {
332 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr;
333 int addr_type, scoped, has_addr;
334 struct net_device *dev = NULL;
335
336 if (addr_len < sizeof(*addr))
337 return -EINVAL;
338
339 if (addr->sin6_family != AF_INET6)
340 return -EAFNOSUPPORT;
341
342 pr_debug("ping_check_bind_addr(sk=%p,addr=%pI6c,port=%d)\n",
343 sk, addr->sin6_addr.s6_addr, ntohs(addr->sin6_port));
344
345 addr_type = ipv6_addr_type(&addr->sin6_addr);
346 scoped = __ipv6_addr_needs_scope_id(addr_type);
347 if ((addr_type != IPV6_ADDR_ANY &&
348 !(addr_type & IPV6_ADDR_UNICAST)) ||
349 (scoped && !addr->sin6_scope_id))
350 return -EINVAL;
351
352 rcu_read_lock();
353 if (addr->sin6_scope_id) {
354 dev = dev_get_by_index_rcu(net, addr->sin6_scope_id);
355 if (!dev) {
356 rcu_read_unlock();
357 return -ENODEV;
358 }
359 }
360 has_addr = pingv6_ops.ipv6_chk_addr(net, &addr->sin6_addr, dev,
361 scoped);
362 rcu_read_unlock();
363
364 if (!(net->ipv6.sysctl.ip_nonlocal_bind ||
365 isk->freebind || isk->transparent || has_addr ||
366 addr_type == IPV6_ADDR_ANY))
367 return -EADDRNOTAVAIL;
368
369 if (scoped)
370 sk->sk_bound_dev_if = addr->sin6_scope_id;
371#endif
372 } else {
373 return -EAFNOSUPPORT;
374 }
375 return 0;
376}
377
378static void ping_set_saddr(struct sock *sk, struct sockaddr *saddr)
379{
380 if (saddr->sa_family == AF_INET) {
381 struct inet_sock *isk = inet_sk(sk);
382 struct sockaddr_in *addr = (struct sockaddr_in *) saddr;
383 isk->inet_rcv_saddr = isk->inet_saddr = addr->sin_addr.s_addr;
384#if IS_ENABLED(CONFIG_IPV6)
385 } else if (saddr->sa_family == AF_INET6) {
386 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) saddr;
387 struct ipv6_pinfo *np = inet6_sk(sk);
388 sk->sk_v6_rcv_saddr = np->saddr = addr->sin6_addr;
389#endif
390 }
391}
392
393static void ping_clear_saddr(struct sock *sk, int dif)
394{
395 sk->sk_bound_dev_if = dif;
396 if (sk->sk_family == AF_INET) {
397 struct inet_sock *isk = inet_sk(sk);
398 isk->inet_rcv_saddr = isk->inet_saddr = 0;
399#if IS_ENABLED(CONFIG_IPV6)
400 } else if (sk->sk_family == AF_INET6) {
401 struct ipv6_pinfo *np = inet6_sk(sk);
402 memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr));
403 memset(&np->saddr, 0, sizeof(np->saddr));
404#endif
405 }
406}
407
408
409
410
411
412int ping_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
413{
414 struct inet_sock *isk = inet_sk(sk);
415 unsigned short snum;
416 int err;
417 int dif = sk->sk_bound_dev_if;
418
419 err = ping_check_bind_addr(sk, isk, uaddr, addr_len);
420 if (err)
421 return err;
422
423 lock_sock(sk);
424
425 err = -EINVAL;
426 if (isk->inet_num != 0)
427 goto out;
428
429 err = -EADDRINUSE;
430 ping_set_saddr(sk, uaddr);
431 snum = ntohs(((struct sockaddr_in *)uaddr)->sin_port);
432 if (ping_get_port(sk, snum) != 0) {
433 ping_clear_saddr(sk, dif);
434 goto out;
435 }
436
437 pr_debug("after bind(): num = %hu, dif = %d\n",
438 isk->inet_num,
439 sk->sk_bound_dev_if);
440
441 err = 0;
442 if (sk->sk_family == AF_INET && isk->inet_rcv_saddr)
443 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
444#if IS_ENABLED(CONFIG_IPV6)
445 if (sk->sk_family == AF_INET6 && !ipv6_addr_any(&sk->sk_v6_rcv_saddr))
446 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
447#endif
448
449 if (snum)
450 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
451 isk->inet_sport = htons(isk->inet_num);
452 isk->inet_daddr = 0;
453 isk->inet_dport = 0;
454
455#if IS_ENABLED(CONFIG_IPV6)
456 if (sk->sk_family == AF_INET6)
457 memset(&sk->sk_v6_daddr, 0, sizeof(sk->sk_v6_daddr));
458#endif
459
460 sk_dst_reset(sk);
461out:
462 release_sock(sk);
463 pr_debug("ping_v4_bind -> %d\n", err);
464 return err;
465}
466EXPORT_SYMBOL_GPL(ping_bind);
467
468
469
470
471
472static inline int ping_supported(int family, int type, int code)
473{
474 return (family == AF_INET && type == ICMP_ECHO && code == 0) ||
475 (family == AF_INET6 && type == ICMPV6_ECHO_REQUEST && code == 0);
476}
477
478
479
480
481
482
483void ping_err(struct sk_buff *skb, int offset, u32 info)
484{
485 int family;
486 struct icmphdr *icmph;
487 struct inet_sock *inet_sock;
488 int type;
489 int code;
490 struct net *net = dev_net(skb->dev);
491 struct sock *sk;
492 int harderr;
493 int err;
494
495 if (skb->protocol == htons(ETH_P_IP)) {
496 family = AF_INET;
497 type = icmp_hdr(skb)->type;
498 code = icmp_hdr(skb)->code;
499 icmph = (struct icmphdr *)(skb->data + offset);
500 } else if (skb->protocol == htons(ETH_P_IPV6)) {
501 family = AF_INET6;
502 type = icmp6_hdr(skb)->icmp6_type;
503 code = icmp6_hdr(skb)->icmp6_code;
504 icmph = (struct icmphdr *) (skb->data + offset);
505 } else {
506 BUG();
507 }
508
509
510
511 if (!ping_supported(family, icmph->type, icmph->code))
512 return;
513
514 pr_debug("ping_err(proto=0x%x,type=%d,code=%d,id=%04x,seq=%04x)\n",
515 skb->protocol, type, code, ntohs(icmph->un.echo.id),
516 ntohs(icmph->un.echo.sequence));
517
518 sk = ping_lookup(net, skb, ntohs(icmph->un.echo.id));
519 if (!sk) {
520 pr_debug("no socket, dropping\n");
521 return;
522 }
523 pr_debug("err on socket %p\n", sk);
524
525 err = 0;
526 harderr = 0;
527 inet_sock = inet_sk(sk);
528
529 if (skb->protocol == htons(ETH_P_IP)) {
530 switch (type) {
531 default:
532 case ICMP_TIME_EXCEEDED:
533 err = EHOSTUNREACH;
534 break;
535 case ICMP_SOURCE_QUENCH:
536
537
538
539 err = EREMOTEIO;
540 break;
541 case ICMP_PARAMETERPROB:
542 err = EPROTO;
543 harderr = 1;
544 break;
545 case ICMP_DEST_UNREACH:
546 if (code == ICMP_FRAG_NEEDED) {
547 ipv4_sk_update_pmtu(skb, sk, info);
548 if (inet_sock->pmtudisc != IP_PMTUDISC_DONT) {
549 err = EMSGSIZE;
550 harderr = 1;
551 break;
552 }
553 goto out;
554 }
555 err = EHOSTUNREACH;
556 if (code <= NR_ICMP_UNREACH) {
557 harderr = icmp_err_convert[code].fatal;
558 err = icmp_err_convert[code].errno;
559 }
560 break;
561 case ICMP_REDIRECT:
562
563 ipv4_sk_redirect(skb, sk);
564 err = EREMOTEIO;
565 break;
566 }
567#if IS_ENABLED(CONFIG_IPV6)
568 } else if (skb->protocol == htons(ETH_P_IPV6)) {
569 harderr = pingv6_ops.icmpv6_err_convert(type, code, &err);
570#endif
571 }
572
573
574
575
576
577 if ((family == AF_INET && !inet_sock->recverr) ||
578 (family == AF_INET6 && !inet6_sk(sk)->recverr)) {
579 if (!harderr || sk->sk_state != TCP_ESTABLISHED)
580 goto out;
581 } else {
582 if (family == AF_INET) {
583 ip_icmp_error(sk, skb, err, 0 ,
584 info, (u8 *)icmph);
585#if IS_ENABLED(CONFIG_IPV6)
586 } else if (family == AF_INET6) {
587 pingv6_ops.ipv6_icmp_error(sk, skb, err, 0,
588 info, (u8 *)icmph);
589#endif
590 }
591 }
592 sk->sk_err = err;
593 sk->sk_error_report(sk);
594out:
595 sock_put(sk);
596}
597EXPORT_SYMBOL_GPL(ping_err);
598
599
600
601
602
603
604int ping_getfrag(void *from, char *to,
605 int offset, int fraglen, int odd, struct sk_buff *skb)
606{
607 struct pingfakehdr *pfh = (struct pingfakehdr *)from;
608
609 if (offset == 0) {
610 fraglen -= sizeof(struct icmphdr);
611 if (fraglen < 0)
612 BUG();
613 if (!csum_and_copy_from_iter_full(to + sizeof(struct icmphdr),
614 fraglen, &pfh->wcheck,
615 &pfh->msg->msg_iter))
616 return -EFAULT;
617 } else if (offset < sizeof(struct icmphdr)) {
618 BUG();
619 } else {
620 if (!csum_and_copy_from_iter_full(to, fraglen, &pfh->wcheck,
621 &pfh->msg->msg_iter))
622 return -EFAULT;
623 }
624
625#if IS_ENABLED(CONFIG_IPV6)
626
627
628
629
630 if (pfh->family == AF_INET6) {
631 skb->csum = pfh->wcheck;
632 skb->ip_summed = CHECKSUM_NONE;
633 pfh->wcheck = 0;
634 }
635#endif
636
637 return 0;
638}
639EXPORT_SYMBOL_GPL(ping_getfrag);
640
641static int ping_v4_push_pending_frames(struct sock *sk, struct pingfakehdr *pfh,
642 struct flowi4 *fl4)
643{
644 struct sk_buff *skb = skb_peek(&sk->sk_write_queue);
645
646 if (!skb)
647 return 0;
648 pfh->wcheck = csum_partial((char *)&pfh->icmph,
649 sizeof(struct icmphdr), pfh->wcheck);
650 pfh->icmph.checksum = csum_fold(pfh->wcheck);
651 memcpy(icmp_hdr(skb), &pfh->icmph, sizeof(struct icmphdr));
652 skb->ip_summed = CHECKSUM_NONE;
653 return ip_push_pending_frames(sk, fl4);
654}
655
656int ping_common_sendmsg(int family, struct msghdr *msg, size_t len,
657 void *user_icmph, size_t icmph_len) {
658 u8 type, code;
659
660 if (len > 0xFFFF)
661 return -EMSGSIZE;
662
663
664 if (len < icmph_len)
665 return -EINVAL;
666
667
668
669
670
671
672 if (msg->msg_flags & MSG_OOB)
673 return -EOPNOTSUPP;
674
675
676
677
678
679 if (memcpy_from_msg(user_icmph, msg, icmph_len))
680 return -EFAULT;
681
682 if (family == AF_INET) {
683 type = ((struct icmphdr *) user_icmph)->type;
684 code = ((struct icmphdr *) user_icmph)->code;
685#if IS_ENABLED(CONFIG_IPV6)
686 } else if (family == AF_INET6) {
687 type = ((struct icmp6hdr *) user_icmph)->icmp6_type;
688 code = ((struct icmp6hdr *) user_icmph)->icmp6_code;
689#endif
690 } else {
691 BUG();
692 }
693
694 if (!ping_supported(family, type, code))
695 return -EINVAL;
696
697 return 0;
698}
699EXPORT_SYMBOL_GPL(ping_common_sendmsg);
700
701static int ping_v4_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
702{
703 struct net *net = sock_net(sk);
704 struct flowi4 fl4;
705 struct inet_sock *inet = inet_sk(sk);
706 struct ipcm_cookie ipc;
707 struct icmphdr user_icmph;
708 struct pingfakehdr pfh;
709 struct rtable *rt = NULL;
710 struct ip_options_data opt_copy;
711 int free = 0;
712 __be32 saddr, daddr, faddr;
713 u8 tos;
714 int err;
715
716 pr_debug("ping_v4_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num);
717
718 err = ping_common_sendmsg(AF_INET, msg, len, &user_icmph,
719 sizeof(user_icmph));
720 if (err)
721 return err;
722
723
724
725
726
727 if (msg->msg_name) {
728 DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name);
729 if (msg->msg_namelen < sizeof(*usin))
730 return -EINVAL;
731 if (usin->sin_family != AF_INET)
732 return -EAFNOSUPPORT;
733 daddr = usin->sin_addr.s_addr;
734
735 } else {
736 if (sk->sk_state != TCP_ESTABLISHED)
737 return -EDESTADDRREQ;
738 daddr = inet->inet_daddr;
739
740 }
741
742 ipc.sockc.tsflags = sk->sk_tsflags;
743 ipc.addr = inet->inet_saddr;
744 ipc.opt = NULL;
745 ipc.oif = sk->sk_bound_dev_if;
746 ipc.tx_flags = 0;
747 ipc.ttl = 0;
748 ipc.tos = -1;
749
750 if (msg->msg_controllen) {
751 err = ip_cmsg_send(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 sock_tx_timestamp(sk, ipc.sockc.tsflags, &ipc.tx_flags);
773
774 saddr = ipc.addr;
775 ipc.addr = faddr = daddr;
776
777 if (ipc.opt && ipc.opt->opt.srr) {
778 if (!daddr)
779 return -EINVAL;
780 faddr = ipc.opt->opt.faddr;
781 }
782 tos = get_rttos(&ipc, inet);
783 if (sock_flag(sk, SOCK_LOCALROUTE) ||
784 (msg->msg_flags & MSG_DONTROUTE) ||
785 (ipc.opt && ipc.opt->opt.is_strictroute)) {
786 tos |= RTO_ONLINK;
787 }
788
789 if (ipv4_is_multicast(daddr)) {
790 if (!ipc.oif)
791 ipc.oif = inet->mc_index;
792 if (!saddr)
793 saddr = inet->mc_addr;
794 } else if (!ipc.oif)
795 ipc.oif = inet->uc_index;
796
797 flowi4_init_output(&fl4, ipc.oif, sk->sk_mark, tos,
798 RT_SCOPE_UNIVERSE, sk->sk_protocol,
799 inet_sk_flowi_flags(sk), faddr, saddr, 0, 0,
800 sk->sk_uid);
801
802 security_sk_classify_flow(sk, flowi4_to_flowi(&fl4));
803 rt = ip_route_output_flow(net, &fl4, sk);
804 if (IS_ERR(rt)) {
805 err = PTR_ERR(rt);
806 rt = NULL;
807 if (err == -ENETUNREACH)
808 IP_INC_STATS(net, IPSTATS_MIB_OUTNOROUTES);
809 goto out;
810 }
811
812 err = -EACCES;
813 if ((rt->rt_flags & RTCF_BROADCAST) &&
814 !sock_flag(sk, SOCK_BROADCAST))
815 goto out;
816
817 if (msg->msg_flags & MSG_CONFIRM)
818 goto do_confirm;
819back_from_confirm:
820
821 if (!ipc.addr)
822 ipc.addr = fl4.daddr;
823
824 lock_sock(sk);
825
826 pfh.icmph.type = user_icmph.type;
827 pfh.icmph.code = user_icmph.code;
828 pfh.icmph.checksum = 0;
829 pfh.icmph.un.echo.id = inet->inet_sport;
830 pfh.icmph.un.echo.sequence = user_icmph.un.echo.sequence;
831 pfh.msg = msg;
832 pfh.wcheck = 0;
833 pfh.family = AF_INET;
834
835 err = ip_append_data(sk, &fl4, ping_getfrag, &pfh, len,
836 0, &ipc, &rt, msg->msg_flags);
837 if (err)
838 ip_flush_pending_frames(sk);
839 else
840 err = ping_v4_push_pending_frames(sk, &pfh, &fl4);
841 release_sock(sk);
842
843out:
844 ip_rt_put(rt);
845 if (free)
846 kfree(ipc.opt);
847 if (!err) {
848 icmp_out_count(sock_net(sk), user_icmph.type);
849 return len;
850 }
851 return err;
852
853do_confirm:
854 if (msg->msg_flags & MSG_PROBE)
855 dst_confirm_neigh(&rt->dst, &fl4.daddr);
856 if (!(msg->msg_flags & MSG_PROBE) || len)
857 goto back_from_confirm;
858 err = 0;
859 goto out;
860}
861
862int ping_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int noblock,
863 int flags, int *addr_len)
864{
865 struct inet_sock *isk = inet_sk(sk);
866 int family = sk->sk_family;
867 struct sk_buff *skb;
868 int copied, err;
869
870 pr_debug("ping_recvmsg(sk=%p,sk->num=%u)\n", isk, isk->inet_num);
871
872 err = -EOPNOTSUPP;
873 if (flags & MSG_OOB)
874 goto out;
875
876 if (flags & MSG_ERRQUEUE)
877 return inet_recv_error(sk, msg, len, addr_len);
878
879 skb = skb_recv_datagram(sk, flags, noblock, &err);
880 if (!skb)
881 goto out;
882
883 copied = skb->len;
884 if (copied > len) {
885 msg->msg_flags |= MSG_TRUNC;
886 copied = len;
887 }
888
889
890 err = skb_copy_datagram_msg(skb, 0, msg, copied);
891 if (err)
892 goto done;
893
894 sock_recv_timestamp(msg, sk, skb);
895
896
897 if (family == AF_INET) {
898 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
899
900 if (sin) {
901 sin->sin_family = AF_INET;
902 sin->sin_port = 0 ;
903 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
904 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
905 *addr_len = sizeof(*sin);
906 }
907
908 if (isk->cmsg_flags)
909 ip_cmsg_recv(msg, skb);
910
911#if IS_ENABLED(CONFIG_IPV6)
912 } else if (family == AF_INET6) {
913 struct ipv6_pinfo *np = inet6_sk(sk);
914 struct ipv6hdr *ip6 = ipv6_hdr(skb);
915 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
916
917 if (sin6) {
918 sin6->sin6_family = AF_INET6;
919 sin6->sin6_port = 0;
920 sin6->sin6_addr = ip6->saddr;
921 sin6->sin6_flowinfo = 0;
922 if (np->sndflow)
923 sin6->sin6_flowinfo = ip6_flowinfo(ip6);
924 sin6->sin6_scope_id =
925 ipv6_iface_scope_id(&sin6->sin6_addr,
926 inet6_iif(skb));
927 *addr_len = sizeof(*sin6);
928 }
929
930 if (inet6_sk(sk)->rxopt.all)
931 pingv6_ops.ip6_datagram_recv_common_ctl(sk, msg, skb);
932 if (skb->protocol == htons(ETH_P_IPV6) &&
933 inet6_sk(sk)->rxopt.all)
934 pingv6_ops.ip6_datagram_recv_specific_ctl(sk, msg, skb);
935 else if (skb->protocol == htons(ETH_P_IP) && isk->cmsg_flags)
936 ip_cmsg_recv(msg, skb);
937#endif
938 } else {
939 BUG();
940 }
941
942 err = copied;
943
944done:
945 skb_free_datagram(sk, skb);
946out:
947 pr_debug("ping_recvmsg -> %d\n", err);
948 return err;
949}
950EXPORT_SYMBOL_GPL(ping_recvmsg);
951
952int ping_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
953{
954 pr_debug("ping_queue_rcv_skb(sk=%p,sk->num=%d,skb=%p)\n",
955 inet_sk(sk), inet_sk(sk)->inet_num, skb);
956 if (sock_queue_rcv_skb(sk, skb) < 0) {
957 kfree_skb(skb);
958 pr_debug("ping_queue_rcv_skb -> failed\n");
959 return -1;
960 }
961 return 0;
962}
963EXPORT_SYMBOL_GPL(ping_queue_rcv_skb);
964
965
966
967
968
969
970bool ping_rcv(struct sk_buff *skb)
971{
972 struct sock *sk;
973 struct net *net = dev_net(skb->dev);
974 struct icmphdr *icmph = icmp_hdr(skb);
975
976
977
978 pr_debug("ping_rcv(skb=%p,id=%04x,seq=%04x)\n",
979 skb, ntohs(icmph->un.echo.id), ntohs(icmph->un.echo.sequence));
980
981
982 skb_push(skb, skb->data - (u8 *)icmph);
983
984 sk = ping_lookup(net, skb, ntohs(icmph->un.echo.id));
985 if (sk) {
986 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
987
988 pr_debug("rcv on socket %p\n", sk);
989 if (skb2)
990 ping_queue_rcv_skb(sk, skb2);
991 sock_put(sk);
992 return true;
993 }
994 pr_debug("no socket, dropping\n");
995
996 return false;
997}
998EXPORT_SYMBOL_GPL(ping_rcv);
999
1000struct proto ping_prot = {
1001 .name = "PING",
1002 .owner = THIS_MODULE,
1003 .init = ping_init_sock,
1004 .close = ping_close,
1005 .connect = ip4_datagram_connect,
1006 .disconnect = __udp_disconnect,
1007 .setsockopt = ip_setsockopt,
1008 .getsockopt = ip_getsockopt,
1009 .sendmsg = ping_v4_sendmsg,
1010 .recvmsg = ping_recvmsg,
1011 .bind = ping_bind,
1012 .backlog_rcv = ping_queue_rcv_skb,
1013 .release_cb = ip4_datagram_release_cb,
1014 .hash = ping_hash,
1015 .unhash = ping_unhash,
1016 .get_port = ping_get_port,
1017 .obj_size = sizeof(struct inet_sock),
1018};
1019EXPORT_SYMBOL(ping_prot);
1020
1021#ifdef CONFIG_PROC_FS
1022
1023static struct sock *ping_get_first(struct seq_file *seq, int start)
1024{
1025 struct sock *sk;
1026 struct ping_iter_state *state = seq->private;
1027 struct net *net = seq_file_net(seq);
1028
1029 for (state->bucket = start; state->bucket < PING_HTABLE_SIZE;
1030 ++state->bucket) {
1031 struct hlist_nulls_node *node;
1032 struct hlist_nulls_head *hslot;
1033
1034 hslot = &ping_table.hash[state->bucket];
1035
1036 if (hlist_nulls_empty(hslot))
1037 continue;
1038
1039 sk_nulls_for_each(sk, node, hslot) {
1040 if (net_eq(sock_net(sk), net) &&
1041 sk->sk_family == state->family)
1042 goto found;
1043 }
1044 }
1045 sk = NULL;
1046found:
1047 return sk;
1048}
1049
1050static struct sock *ping_get_next(struct seq_file *seq, struct sock *sk)
1051{
1052 struct ping_iter_state *state = seq->private;
1053 struct net *net = seq_file_net(seq);
1054
1055 do {
1056 sk = sk_nulls_next(sk);
1057 } while (sk && (!net_eq(sock_net(sk), net)));
1058
1059 if (!sk)
1060 return ping_get_first(seq, state->bucket + 1);
1061 return sk;
1062}
1063
1064static struct sock *ping_get_idx(struct seq_file *seq, loff_t pos)
1065{
1066 struct sock *sk = ping_get_first(seq, 0);
1067
1068 if (sk)
1069 while (pos && (sk = ping_get_next(seq, sk)) != NULL)
1070 --pos;
1071 return pos ? NULL : sk;
1072}
1073
1074void *ping_seq_start(struct seq_file *seq, loff_t *pos, sa_family_t family)
1075 __acquires(ping_table.lock)
1076{
1077 struct ping_iter_state *state = seq->private;
1078 state->bucket = 0;
1079 state->family = family;
1080
1081 read_lock_bh(&ping_table.lock);
1082
1083 return *pos ? ping_get_idx(seq, *pos-1) : SEQ_START_TOKEN;
1084}
1085EXPORT_SYMBOL_GPL(ping_seq_start);
1086
1087static void *ping_v4_seq_start(struct seq_file *seq, loff_t *pos)
1088{
1089 return ping_seq_start(seq, pos, AF_INET);
1090}
1091
1092void *ping_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1093{
1094 struct sock *sk;
1095
1096 if (v == SEQ_START_TOKEN)
1097 sk = ping_get_idx(seq, 0);
1098 else
1099 sk = ping_get_next(seq, v);
1100
1101 ++*pos;
1102 return sk;
1103}
1104EXPORT_SYMBOL_GPL(ping_seq_next);
1105
1106void ping_seq_stop(struct seq_file *seq, void *v)
1107 __releases(ping_table.lock)
1108{
1109 read_unlock_bh(&ping_table.lock);
1110}
1111EXPORT_SYMBOL_GPL(ping_seq_stop);
1112
1113static void ping_v4_format_sock(struct sock *sp, struct seq_file *f,
1114 int bucket)
1115{
1116 struct inet_sock *inet = inet_sk(sp);
1117 __be32 dest = inet->inet_daddr;
1118 __be32 src = inet->inet_rcv_saddr;
1119 __u16 destp = ntohs(inet->inet_dport);
1120 __u16 srcp = ntohs(inet->inet_sport);
1121
1122 seq_printf(f, "%5d: %08X:%04X %08X:%04X"
1123 " %02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d",
1124 bucket, src, srcp, dest, destp, sp->sk_state,
1125 sk_wmem_alloc_get(sp),
1126 sk_rmem_alloc_get(sp),
1127 0, 0L, 0,
1128 from_kuid_munged(seq_user_ns(f), sock_i_uid(sp)),
1129 0, sock_i_ino(sp),
1130 refcount_read(&sp->sk_refcnt), sp,
1131 atomic_read(&sp->sk_drops));
1132}
1133
1134static int ping_v4_seq_show(struct seq_file *seq, void *v)
1135{
1136 seq_setwidth(seq, 127);
1137 if (v == SEQ_START_TOKEN)
1138 seq_puts(seq, " sl local_address rem_address st tx_queue "
1139 "rx_queue tr tm->when retrnsmt uid timeout "
1140 "inode ref pointer drops");
1141 else {
1142 struct ping_iter_state *state = seq->private;
1143
1144 ping_v4_format_sock(v, seq, state->bucket);
1145 }
1146 seq_pad(seq, '\n');
1147 return 0;
1148}
1149
1150static int ping_seq_open(struct inode *inode, struct file *file)
1151{
1152 struct ping_seq_afinfo *afinfo = PDE_DATA(inode);
1153 return seq_open_net(inode, file, &afinfo->seq_ops,
1154 sizeof(struct ping_iter_state));
1155}
1156
1157const struct file_operations ping_seq_fops = {
1158 .open = ping_seq_open,
1159 .read = seq_read,
1160 .llseek = seq_lseek,
1161 .release = seq_release_net,
1162};
1163EXPORT_SYMBOL_GPL(ping_seq_fops);
1164
1165static struct ping_seq_afinfo ping_v4_seq_afinfo = {
1166 .name = "icmp",
1167 .family = AF_INET,
1168 .seq_fops = &ping_seq_fops,
1169 .seq_ops = {
1170 .start = ping_v4_seq_start,
1171 .show = ping_v4_seq_show,
1172 .next = ping_seq_next,
1173 .stop = ping_seq_stop,
1174 },
1175};
1176
1177int ping_proc_register(struct net *net, struct ping_seq_afinfo *afinfo)
1178{
1179 struct proc_dir_entry *p;
1180 p = proc_create_data(afinfo->name, S_IRUGO, net->proc_net,
1181 afinfo->seq_fops, afinfo);
1182 if (!p)
1183 return -ENOMEM;
1184 return 0;
1185}
1186EXPORT_SYMBOL_GPL(ping_proc_register);
1187
1188void ping_proc_unregister(struct net *net, struct ping_seq_afinfo *afinfo)
1189{
1190 remove_proc_entry(afinfo->name, net->proc_net);
1191}
1192EXPORT_SYMBOL_GPL(ping_proc_unregister);
1193
1194static int __net_init ping_v4_proc_init_net(struct net *net)
1195{
1196 return ping_proc_register(net, &ping_v4_seq_afinfo);
1197}
1198
1199static void __net_exit ping_v4_proc_exit_net(struct net *net)
1200{
1201 ping_proc_unregister(net, &ping_v4_seq_afinfo);
1202}
1203
1204static struct pernet_operations ping_v4_net_ops = {
1205 .init = ping_v4_proc_init_net,
1206 .exit = ping_v4_proc_exit_net,
1207};
1208
1209int __init ping_proc_init(void)
1210{
1211 return register_pernet_subsys(&ping_v4_net_ops);
1212}
1213
1214void ping_proc_exit(void)
1215{
1216 unregister_pernet_subsys(&ping_v4_net_ops);
1217}
1218
1219#endif
1220
1221void __init ping_init(void)
1222{
1223 int i;
1224
1225 for (i = 0; i < PING_HTABLE_SIZE; i++)
1226 INIT_HLIST_NULLS_HEAD(&ping_table.hash[i], i);
1227 rwlock_init(&ping_table.lock);
1228}
1229
