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.
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.
13 * Based on ipv4/udp.c code.
15 * Authors: Vasiliy Kulikov / Openwall (for Linux 2.6),
16 * Pavel Kankovsky (for Linux 2.4.32)
18 * Pavel gave all rights to bugs to Vasiliy,
19 * none of the bugs are Pavel's now.
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>
29 #include <linux/errno.h>
30 #include <linux/timer.h>
32 #include <linux/inet.h>
33 #include <linux/netdevice.h>
37 #include <net/protocol.h>
38 #include <linux/skbuff.h>
39 #include <linux/proc_fs.h>
40 #include <linux/export.h>
44 #include <net/route.h>
45 #include <net/inet_common.h>
46 #include <net/checksum.h>
48 #if IS_ENABLED(CONFIG_IPV6)
49 #include <linux/in6.h>
50 #include <linux/icmpv6.h>
51 #include <net/addrconf.h>
53 #include <net/transp_v6.h>
57 struct ping_table ping_table;
58 struct pingv6_ops pingv6_ops;
59 EXPORT_SYMBOL_GPL(pingv6_ops);
61 static u16 ping_port_rover;
63 static inline int ping_hashfn(struct net *net, unsigned int num, unsigned int mask)
65 int res = (num + net_hash_mix(net)) & mask;
67 pr_debug("hash(%d) = %d\n", num, res);
70 EXPORT_SYMBOL_GPL(ping_hash);
72 static inline struct hlist_nulls_head *ping_hashslot(struct ping_table *table,
73 struct net *net, unsigned int num)
75 return &table->hash[ping_hashfn(net, num, PING_HTABLE_MASK)];
78 int ping_get_port(struct sock *sk, unsigned short ident)
80 struct hlist_nulls_node *node;
81 struct hlist_nulls_head *hlist;
82 struct inet_sock *isk, *isk2;
83 struct sock *sk2 = NULL;
86 write_lock_bh(&ping_table.lock);
89 u16 result = ping_port_rover + 1;
91 for (i = 0; i < (1L << 16); i++, result++) {
93 result++; /* avoid zero */
94 hlist = ping_hashslot(&ping_table, sock_net(sk),
96 ping_portaddr_for_each_entry(sk2, node, hlist) {
99 if (isk2->inet_num == result)
104 ping_port_rover = ident = result;
112 hlist = ping_hashslot(&ping_table, sock_net(sk), ident);
113 ping_portaddr_for_each_entry(sk2, node, hlist) {
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.
120 if ((isk2->inet_num == ident) &&
122 (!sk2->sk_reuse || !sk->sk_reuse))
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");
132 hlist_nulls_add_head(&sk->sk_nulls_node, hlist);
133 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
135 write_unlock_bh(&ping_table.lock);
139 write_unlock_bh(&ping_table.lock);
142 EXPORT_SYMBOL_GPL(ping_get_port);
144 void ping_hash(struct sock *sk)
146 pr_debug("ping_hash(sk->port=%u)\n", inet_sk(sk)->inet_num);
147 BUG(); /* "Please do not press this button again." */
150 void ping_unhash(struct sock *sk)
152 struct inet_sock *isk = inet_sk(sk);
153 pr_debug("ping_unhash(isk=%p,isk->num=%u)\n", isk, isk->inet_num);
155 write_lock_bh(&ping_table.lock);
156 hlist_nulls_del(&sk->sk_nulls_node);
157 sk_nulls_node_init(&sk->sk_nulls_node);
161 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
162 write_unlock_bh(&ping_table.lock);
165 EXPORT_SYMBOL_GPL(ping_unhash);
167 static struct sock *ping_lookup(struct net *net, struct sk_buff *skb, u16 ident)
169 struct hlist_nulls_head *hslot = ping_hashslot(&ping_table, net, ident);
170 struct sock *sk = NULL;
171 struct inet_sock *isk;
172 struct hlist_nulls_node *hnode;
173 int dif = skb->dev->ifindex;
175 if (skb->protocol == htons(ETH_P_IP)) {
176 pr_debug("try to find: num = %d, daddr = %pI4, dif = %d\n",
177 (int)ident, &ip_hdr(skb)->daddr, dif);
178 #if IS_ENABLED(CONFIG_IPV6)
179 } else if (skb->protocol == htons(ETH_P_IPV6)) {
180 pr_debug("try to find: num = %d, daddr = %pI6c, dif = %d\n",
181 (int)ident, &ipv6_hdr(skb)->daddr, dif);
185 read_lock_bh(&ping_table.lock);
187 ping_portaddr_for_each_entry(sk, hnode, hslot) {
190 pr_debug("iterate\n");
191 if (isk->inet_num != ident)
194 if (skb->protocol == htons(ETH_P_IP) &&
195 sk->sk_family == AF_INET) {
196 pr_debug("found: %p: num=%d, daddr=%pI4, dif=%d\n", sk,
197 (int) isk->inet_num, &isk->inet_rcv_saddr,
198 sk->sk_bound_dev_if);
200 if (isk->inet_rcv_saddr &&
201 isk->inet_rcv_saddr != ip_hdr(skb)->daddr)
203 #if IS_ENABLED(CONFIG_IPV6)
204 } else if (skb->protocol == htons(ETH_P_IPV6) &&
205 sk->sk_family == AF_INET6) {
206 struct ipv6_pinfo *np = inet6_sk(sk);
208 pr_debug("found: %p: num=%d, daddr=%pI6c, dif=%d\n", sk,
210 &inet6_sk(sk)->rcv_saddr,
211 sk->sk_bound_dev_if);
213 if (!ipv6_addr_any(&np->rcv_saddr) &&
214 !ipv6_addr_equal(&np->rcv_saddr,
215 &ipv6_hdr(skb)->daddr))
222 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)
231 read_unlock_bh(&ping_table.lock);
236 static void inet_get_ping_group_range_net(struct net *net, kgid_t *low,
239 kgid_t *data = net->ipv4.sysctl_ping_group_range;
243 seq = read_seqbegin(&sysctl_local_ports.lock);
247 } while (read_seqretry(&sysctl_local_ports.lock, seq));
251 int ping_init_sock(struct sock *sk)
253 struct net *net = sock_net(sk);
254 kgid_t group = current_egid();
255 struct group_info *group_info;
260 if (sk->sk_family == AF_INET6)
261 inet6_sk(sk)->ipv6only = 1;
263 inet_get_ping_group_range_net(net, &low, &high);
264 if (gid_lte(low, group) && gid_lte(group, high))
267 group_info = get_current_groups();
268 count = group_info->ngroups;
269 for (i = 0; i < group_info->nblocks; i++) {
270 int cp_count = min_t(int, NGROUPS_PER_BLOCK, count);
271 for (j = 0; j < cp_count; j++) {
272 kgid_t gid = group_info->blocks[i][j];
273 if (gid_lte(low, gid) && gid_lte(gid, high))
274 goto out_release_group;
283 put_group_info(group_info);
286 EXPORT_SYMBOL_GPL(ping_init_sock);
288 void ping_close(struct sock *sk, long timeout)
290 pr_debug("ping_close(sk=%p,sk->num=%u)\n",
291 inet_sk(sk), inet_sk(sk)->inet_num);
292 pr_debug("isk->refcnt = %d\n", sk->sk_refcnt.counter);
294 sk_common_release(sk);
296 EXPORT_SYMBOL_GPL(ping_close);
298 /* Checks the bind address and possibly modifies sk->sk_bound_dev_if. */
299 int ping_check_bind_addr(struct sock *sk, struct inet_sock *isk,
300 struct sockaddr *uaddr, int addr_len) {
301 struct net *net = sock_net(sk);
302 if (sk->sk_family == AF_INET) {
303 struct sockaddr_in *addr = (struct sockaddr_in *) uaddr;
306 if (addr_len < sizeof(*addr))
309 if (addr->sin_family != AF_INET &&
310 !(addr->sin_family == AF_UNSPEC &&
311 addr->sin_addr.s_addr == htonl(INADDR_ANY)))
312 return -EAFNOSUPPORT;
314 pr_debug("ping_check_bind_addr(sk=%p,addr=%pI4,port=%d)\n",
315 sk, &addr->sin_addr.s_addr, ntohs(addr->sin_port));
317 chk_addr_ret = inet_addr_type(net, addr->sin_addr.s_addr);
319 if (addr->sin_addr.s_addr == htonl(INADDR_ANY))
320 chk_addr_ret = RTN_LOCAL;
322 if ((sysctl_ip_nonlocal_bind == 0 &&
323 isk->freebind == 0 && isk->transparent == 0 &&
324 chk_addr_ret != RTN_LOCAL) ||
325 chk_addr_ret == RTN_MULTICAST ||
326 chk_addr_ret == RTN_BROADCAST)
327 return -EADDRNOTAVAIL;
329 #if IS_ENABLED(CONFIG_IPV6)
330 } else if (sk->sk_family == AF_INET6) {
331 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr;
332 int addr_type, scoped, has_addr;
333 struct net_device *dev = NULL;
335 if (addr_len < sizeof(*addr))
338 if (addr->sin6_family != AF_INET6)
339 return -EAFNOSUPPORT;
341 pr_debug("ping_check_bind_addr(sk=%p,addr=%pI6c,port=%d)\n",
342 sk, addr->sin6_addr.s6_addr, ntohs(addr->sin6_port));
344 addr_type = ipv6_addr_type(&addr->sin6_addr);
345 scoped = __ipv6_addr_needs_scope_id(addr_type);
346 if ((addr_type != IPV6_ADDR_ANY &&
347 !(addr_type & IPV6_ADDR_UNICAST)) ||
348 (scoped && !addr->sin6_scope_id))
352 if (addr->sin6_scope_id) {
353 dev = dev_get_by_index_rcu(net, addr->sin6_scope_id);
359 has_addr = pingv6_ops.ipv6_chk_addr(net, &addr->sin6_addr, dev,
363 if (!(isk->freebind || isk->transparent || has_addr ||
364 addr_type == IPV6_ADDR_ANY))
365 return -EADDRNOTAVAIL;
368 sk->sk_bound_dev_if = addr->sin6_scope_id;
371 return -EAFNOSUPPORT;
376 void ping_set_saddr(struct sock *sk, struct sockaddr *saddr)
378 if (saddr->sa_family == AF_INET) {
379 struct inet_sock *isk = inet_sk(sk);
380 struct sockaddr_in *addr = (struct sockaddr_in *) saddr;
381 isk->inet_rcv_saddr = isk->inet_saddr = addr->sin_addr.s_addr;
382 #if IS_ENABLED(CONFIG_IPV6)
383 } else if (saddr->sa_family == AF_INET6) {
384 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) saddr;
385 struct ipv6_pinfo *np = inet6_sk(sk);
386 np->rcv_saddr = np->saddr = addr->sin6_addr;
391 void ping_clear_saddr(struct sock *sk, int dif)
393 sk->sk_bound_dev_if = dif;
394 if (sk->sk_family == AF_INET) {
395 struct inet_sock *isk = inet_sk(sk);
396 isk->inet_rcv_saddr = isk->inet_saddr = 0;
397 #if IS_ENABLED(CONFIG_IPV6)
398 } else if (sk->sk_family == AF_INET6) {
399 struct ipv6_pinfo *np = inet6_sk(sk);
400 memset(&np->rcv_saddr, 0, sizeof(np->rcv_saddr));
401 memset(&np->saddr, 0, sizeof(np->saddr));
406 * We need our own bind because there are no privileged id's == local ports.
407 * Moreover, we don't allow binding to multi- and broadcast addresses.
410 int ping_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
412 struct inet_sock *isk = inet_sk(sk);
415 int dif = sk->sk_bound_dev_if;
417 err = ping_check_bind_addr(sk, isk, uaddr, addr_len);
424 if (isk->inet_num != 0)
428 ping_set_saddr(sk, uaddr);
429 snum = ntohs(((struct sockaddr_in *)uaddr)->sin_port);
430 if (ping_get_port(sk, snum) != 0) {
431 ping_clear_saddr(sk, dif);
435 pr_debug("after bind(): num = %d, dif = %d\n",
437 (int)sk->sk_bound_dev_if);
440 if ((sk->sk_family == AF_INET && isk->inet_rcv_saddr) ||
441 (sk->sk_family == AF_INET6 &&
442 !ipv6_addr_any(&inet6_sk(sk)->rcv_saddr)))
443 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
446 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
447 isk->inet_sport = htons(isk->inet_num);
451 #if IS_ENABLED(CONFIG_IPV6)
452 if (sk->sk_family == AF_INET6)
453 memset(&inet6_sk(sk)->daddr, 0, sizeof(inet6_sk(sk)->daddr));
459 pr_debug("ping_v4_bind -> %d\n", err);
462 EXPORT_SYMBOL_GPL(ping_bind);
465 * Is this a supported type of ICMP message?
468 static inline int ping_supported(int family, int type, int code)
470 return (family == AF_INET && type == ICMP_ECHO && code == 0) ||
471 (family == AF_INET6 && type == ICMPV6_ECHO_REQUEST && code == 0);
475 * This routine is called by the ICMP module when it gets some
476 * sort of error condition.
479 void ping_err(struct sk_buff *skb, int offset, u32 info)
482 struct icmphdr *icmph;
483 struct inet_sock *inet_sock;
486 struct net *net = dev_net(skb->dev);
491 if (skb->protocol == htons(ETH_P_IP)) {
493 type = icmp_hdr(skb)->type;
494 code = icmp_hdr(skb)->code;
495 icmph = (struct icmphdr *)(skb->data + offset);
496 } else if (skb->protocol == htons(ETH_P_IPV6)) {
498 type = icmp6_hdr(skb)->icmp6_type;
499 code = icmp6_hdr(skb)->icmp6_code;
500 icmph = (struct icmphdr *) (skb->data + offset);
505 /* We assume the packet has already been checked by icmp_unreach */
507 if (!ping_supported(family, icmph->type, icmph->code))
510 pr_debug("ping_err(proto=0x%x,type=%d,code=%d,id=%04x,seq=%04x)\n",
511 skb->protocol, type, code, ntohs(icmph->un.echo.id),
512 ntohs(icmph->un.echo.sequence));
514 sk = ping_lookup(net, skb, ntohs(icmph->un.echo.id));
516 pr_debug("no socket, dropping\n");
517 return; /* No socket for error */
519 pr_debug("err on socket %p\n", sk);
523 inet_sock = inet_sk(sk);
525 if (skb->protocol == htons(ETH_P_IP)) {
528 case ICMP_TIME_EXCEEDED:
531 case ICMP_SOURCE_QUENCH:
532 /* This is not a real error but ping wants to see it.
533 * Report it with some fake errno.
537 case ICMP_PARAMETERPROB:
541 case ICMP_DEST_UNREACH:
542 if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */
543 ipv4_sk_update_pmtu(skb, sk, info);
544 if (inet_sock->pmtudisc != IP_PMTUDISC_DONT) {
552 if (code <= NR_ICMP_UNREACH) {
553 harderr = icmp_err_convert[code].fatal;
554 err = icmp_err_convert[code].errno;
558 /* See ICMP_SOURCE_QUENCH */
559 ipv4_sk_redirect(skb, sk);
563 #if IS_ENABLED(CONFIG_IPV6)
564 } else if (skb->protocol == htons(ETH_P_IPV6)) {
565 harderr = pingv6_ops.icmpv6_err_convert(type, code, &err);
570 * RFC1122: OK. Passes ICMP errors back to application, as per
573 if ((family == AF_INET && !inet_sock->recverr) ||
574 (family == AF_INET6 && !inet6_sk(sk)->recverr)) {
575 if (!harderr || sk->sk_state != TCP_ESTABLISHED)
578 if (family == AF_INET) {
579 ip_icmp_error(sk, skb, err, 0 /* no remote port */,
581 #if IS_ENABLED(CONFIG_IPV6)
582 } else if (family == AF_INET6) {
583 pingv6_ops.ipv6_icmp_error(sk, skb, err, 0,
589 sk->sk_error_report(sk);
593 EXPORT_SYMBOL_GPL(ping_err);
596 * Copy and checksum an ICMP Echo packet from user space into a buffer
597 * starting from the payload.
600 int ping_getfrag(void *from, char *to,
601 int offset, int fraglen, int odd, struct sk_buff *skb)
603 struct pingfakehdr *pfh = (struct pingfakehdr *)from;
606 if (fraglen < sizeof(struct icmphdr))
608 if (csum_partial_copy_fromiovecend(to + sizeof(struct icmphdr),
609 pfh->iov, 0, fraglen - sizeof(struct icmphdr),
612 } else if (offset < sizeof(struct icmphdr)) {
615 if (csum_partial_copy_fromiovecend
616 (to, pfh->iov, offset - sizeof(struct icmphdr),
617 fraglen, &pfh->wcheck))
621 #if IS_ENABLED(CONFIG_IPV6)
622 /* For IPv6, checksum each skb as we go along, as expected by
623 * icmpv6_push_pending_frames. For IPv4, accumulate the checksum in
624 * wcheck, it will be finalized in ping_v4_push_pending_frames.
626 if (pfh->family == AF_INET6) {
627 skb->csum = pfh->wcheck;
628 skb->ip_summed = CHECKSUM_NONE;
635 EXPORT_SYMBOL_GPL(ping_getfrag);
637 static int ping_v4_push_pending_frames(struct sock *sk, struct pingfakehdr *pfh,
640 struct sk_buff *skb = skb_peek(&sk->sk_write_queue);
642 pfh->wcheck = csum_partial((char *)&pfh->icmph,
643 sizeof(struct icmphdr), pfh->wcheck);
644 pfh->icmph.checksum = csum_fold(pfh->wcheck);
645 memcpy(icmp_hdr(skb), &pfh->icmph, sizeof(struct icmphdr));
646 skb->ip_summed = CHECKSUM_NONE;
647 return ip_push_pending_frames(sk, fl4);
650 int ping_common_sendmsg(int family, struct msghdr *msg, size_t len,
651 void *user_icmph, size_t icmph_len) {
661 /* Mirror BSD error message compatibility */
662 if (msg->msg_flags & MSG_OOB)
666 * Fetch the ICMP header provided by the userland.
667 * iovec is modified! The ICMP header is consumed.
669 if (memcpy_fromiovec(user_icmph, msg->msg_iov, icmph_len))
672 if (family == AF_INET) {
673 type = ((struct icmphdr *) user_icmph)->type;
674 code = ((struct icmphdr *) user_icmph)->code;
675 #if IS_ENABLED(CONFIG_IPV6)
676 } else if (family == AF_INET6) {
677 type = ((struct icmp6hdr *) user_icmph)->icmp6_type;
678 code = ((struct icmp6hdr *) user_icmph)->icmp6_code;
684 if (!ping_supported(family, type, code))
689 EXPORT_SYMBOL_GPL(ping_common_sendmsg);
691 int ping_v4_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
694 struct net *net = sock_net(sk);
696 struct inet_sock *inet = inet_sk(sk);
697 struct ipcm_cookie ipc;
698 struct icmphdr user_icmph;
699 struct pingfakehdr pfh;
700 struct rtable *rt = NULL;
701 struct ip_options_data opt_copy;
703 __be32 saddr, daddr, faddr;
707 pr_debug("ping_v4_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num);
709 err = ping_common_sendmsg(AF_INET, msg, len, &user_icmph,
715 * Get and verify the address.
719 struct sockaddr_in *usin = (struct sockaddr_in *)msg->msg_name;
720 if (msg->msg_namelen < sizeof(*usin))
722 if (usin->sin_family != AF_INET)
723 return -EAFNOSUPPORT;
724 daddr = usin->sin_addr.s_addr;
727 if (sk->sk_state != TCP_ESTABLISHED)
728 return -EDESTADDRREQ;
729 daddr = inet->inet_daddr;
733 ipc.addr = inet->inet_saddr;
735 ipc.oif = sk->sk_bound_dev_if;
738 sock_tx_timestamp(sk, &ipc.tx_flags);
740 if (msg->msg_controllen) {
741 err = ip_cmsg_send(sock_net(sk), msg, &ipc);
748 struct ip_options_rcu *inet_opt;
751 inet_opt = rcu_dereference(inet->inet_opt);
753 memcpy(&opt_copy, inet_opt,
754 sizeof(*inet_opt) + inet_opt->opt.optlen);
755 ipc.opt = &opt_copy.opt;
761 ipc.addr = faddr = daddr;
763 if (ipc.opt && ipc.opt->opt.srr) {
766 faddr = ipc.opt->opt.faddr;
768 tos = RT_TOS(inet->tos);
769 if (sock_flag(sk, SOCK_LOCALROUTE) ||
770 (msg->msg_flags & MSG_DONTROUTE) ||
771 (ipc.opt && ipc.opt->opt.is_strictroute)) {
775 if (ipv4_is_multicast(daddr)) {
777 ipc.oif = inet->mc_index;
779 saddr = inet->mc_addr;
781 ipc.oif = inet->uc_index;
783 flowi4_init_output(&fl4, ipc.oif, sk->sk_mark, tos,
784 RT_SCOPE_UNIVERSE, sk->sk_protocol,
785 inet_sk_flowi_flags(sk), faddr, saddr, 0, 0,
788 security_sk_classify_flow(sk, flowi4_to_flowi(&fl4));
789 rt = ip_route_output_flow(net, &fl4, sk);
793 if (err == -ENETUNREACH)
794 IP_INC_STATS(net, IPSTATS_MIB_OUTNOROUTES);
799 if ((rt->rt_flags & RTCF_BROADCAST) &&
800 !sock_flag(sk, SOCK_BROADCAST))
803 if (msg->msg_flags & MSG_CONFIRM)
808 ipc.addr = fl4.daddr;
812 pfh.icmph.type = user_icmph.type; /* already checked */
813 pfh.icmph.code = user_icmph.code; /* ditto */
814 pfh.icmph.checksum = 0;
815 pfh.icmph.un.echo.id = inet->inet_sport;
816 pfh.icmph.un.echo.sequence = user_icmph.un.echo.sequence;
817 pfh.iov = msg->msg_iov;
819 pfh.family = AF_INET;
821 err = ip_append_data(sk, &fl4, ping_getfrag, &pfh, len,
822 0, &ipc, &rt, msg->msg_flags);
824 ip_flush_pending_frames(sk);
826 err = ping_v4_push_pending_frames(sk, &pfh, &fl4);
834 icmp_out_count(sock_net(sk), user_icmph.type);
840 dst_confirm(&rt->dst);
841 if (!(msg->msg_flags & MSG_PROBE) || len)
842 goto back_from_confirm;
847 int ping_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
848 size_t len, int noblock, int flags, int *addr_len)
850 struct inet_sock *isk = inet_sk(sk);
851 int family = sk->sk_family;
852 struct sockaddr_in *sin;
853 struct sockaddr_in6 *sin6;
857 pr_debug("ping_recvmsg(sk=%p,sk->num=%u)\n", isk, isk->inet_num);
864 if (family == AF_INET)
865 *addr_len = sizeof(*sin);
866 else if (family == AF_INET6 && addr_len)
867 *addr_len = sizeof(*sin6);
870 if (flags & MSG_ERRQUEUE) {
871 if (family == AF_INET) {
872 return ip_recv_error(sk, msg, len, addr_len);
873 #if IS_ENABLED(CONFIG_IPV6)
874 } else if (family == AF_INET6) {
875 return pingv6_ops.ipv6_recv_error(sk, msg, len);
880 skb = skb_recv_datagram(sk, flags, noblock, &err);
886 msg->msg_flags |= MSG_TRUNC;
890 /* Don't bother checking the checksum */
891 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
895 sock_recv_timestamp(msg, sk, skb);
897 /* Copy the address and add cmsg data. */
898 if (family == AF_INET) {
899 sin = (struct sockaddr_in *) msg->msg_name;
901 sin->sin_family = AF_INET;
902 sin->sin_port = 0 /* skb->h.uh->source */;
903 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
904 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
908 ip_cmsg_recv(msg, skb);
910 #if IS_ENABLED(CONFIG_IPV6)
911 } else if (family == AF_INET6) {
912 struct ipv6_pinfo *np = inet6_sk(sk);
913 struct ipv6hdr *ip6 = ipv6_hdr(skb);
914 sin6 = (struct sockaddr_in6 *) msg->msg_name;
917 sin6->sin6_family = AF_INET6;
919 sin6->sin6_addr = ip6->saddr;
920 sin6->sin6_flowinfo = 0;
922 sin6->sin6_flowinfo = ip6_flowinfo(ip6);
923 sin6->sin6_scope_id =
924 ipv6_iface_scope_id(&sin6->sin6_addr,
928 if (inet6_sk(sk)->rxopt.all)
929 pingv6_ops.ip6_datagram_recv_ctl(sk, msg, skb);
938 skb_free_datagram(sk, skb);
940 pr_debug("ping_recvmsg -> %d\n", err);
943 EXPORT_SYMBOL_GPL(ping_recvmsg);
945 int ping_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
947 pr_debug("ping_queue_rcv_skb(sk=%p,sk->num=%d,skb=%p)\n",
948 inet_sk(sk), inet_sk(sk)->inet_num, skb);
949 if (sock_queue_rcv_skb(sk, skb) < 0) {
951 pr_debug("ping_queue_rcv_skb -> failed\n");
956 EXPORT_SYMBOL_GPL(ping_queue_rcv_skb);
960 * All we need to do is get the socket.
963 void ping_rcv(struct sk_buff *skb)
966 struct net *net = dev_net(skb->dev);
967 struct icmphdr *icmph = icmp_hdr(skb);
969 /* We assume the packet has already been checked by icmp_rcv */
971 pr_debug("ping_rcv(skb=%p,id=%04x,seq=%04x)\n",
972 skb, ntohs(icmph->un.echo.id), ntohs(icmph->un.echo.sequence));
974 /* Push ICMP header back */
975 skb_push(skb, skb->data - (u8 *)icmph);
977 sk = ping_lookup(net, skb, ntohs(icmph->un.echo.id));
979 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
981 pr_debug("rcv on socket %p\n", sk);
983 ping_queue_rcv_skb(sk, skb2);
987 pr_debug("no socket, dropping\n");
989 /* We're called from icmp_rcv(). kfree_skb() is done there. */
991 EXPORT_SYMBOL_GPL(ping_rcv);
993 struct proto ping_prot = {
995 .owner = THIS_MODULE,
996 .init = ping_init_sock,
998 .connect = ip4_datagram_connect,
999 .disconnect = udp_disconnect,
1000 .setsockopt = ip_setsockopt,
1001 .getsockopt = ip_getsockopt,
1002 .sendmsg = ping_v4_sendmsg,
1003 .recvmsg = ping_recvmsg,
1005 .backlog_rcv = ping_queue_rcv_skb,
1006 .release_cb = ip4_datagram_release_cb,
1008 .unhash = ping_unhash,
1009 .get_port = ping_get_port,
1010 .obj_size = sizeof(struct inet_sock),
1012 EXPORT_SYMBOL(ping_prot);
1014 #ifdef CONFIG_PROC_FS
1016 static struct sock *ping_get_first(struct seq_file *seq, int start)
1019 struct ping_iter_state *state = seq->private;
1020 struct net *net = seq_file_net(seq);
1022 for (state->bucket = start; state->bucket < PING_HTABLE_SIZE;
1024 struct hlist_nulls_node *node;
1025 struct hlist_nulls_head *hslot;
1027 hslot = &ping_table.hash[state->bucket];
1029 if (hlist_nulls_empty(hslot))
1032 sk_nulls_for_each(sk, node, hslot) {
1033 if (net_eq(sock_net(sk), net))
1042 static struct sock *ping_get_next(struct seq_file *seq, struct sock *sk)
1044 struct ping_iter_state *state = seq->private;
1045 struct net *net = seq_file_net(seq);
1048 sk = sk_nulls_next(sk);
1049 } while (sk && (!net_eq(sock_net(sk), net)));
1052 return ping_get_first(seq, state->bucket + 1);
1056 static struct sock *ping_get_idx(struct seq_file *seq, loff_t pos)
1058 struct sock *sk = ping_get_first(seq, 0);
1061 while (pos && (sk = ping_get_next(seq, sk)) != NULL)
1063 return pos ? NULL : sk;
1066 static void *ping_seq_start(struct seq_file *seq, loff_t *pos)
1068 struct ping_iter_state *state = seq->private;
1071 read_lock_bh(&ping_table.lock);
1073 return *pos ? ping_get_idx(seq, *pos-1) : SEQ_START_TOKEN;
1076 static void *ping_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1080 if (v == SEQ_START_TOKEN)
1081 sk = ping_get_idx(seq, 0);
1083 sk = ping_get_next(seq, v);
1089 static void ping_seq_stop(struct seq_file *seq, void *v)
1091 read_unlock_bh(&ping_table.lock);
1094 static void ping_format_sock(struct sock *sp, struct seq_file *f,
1095 int bucket, int *len)
1097 struct inet_sock *inet = inet_sk(sp);
1098 __be32 dest = inet->inet_daddr;
1099 __be32 src = inet->inet_rcv_saddr;
1100 __u16 destp = ntohs(inet->inet_dport);
1101 __u16 srcp = ntohs(inet->inet_sport);
1103 seq_printf(f, "%5d: %08X:%04X %08X:%04X"
1104 " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %d%n",
1105 bucket, src, srcp, dest, destp, sp->sk_state,
1106 sk_wmem_alloc_get(sp),
1107 sk_rmem_alloc_get(sp),
1109 from_kuid_munged(seq_user_ns(f), sock_i_uid(sp)),
1111 atomic_read(&sp->sk_refcnt), sp,
1112 atomic_read(&sp->sk_drops), len);
1115 static int ping_seq_show(struct seq_file *seq, void *v)
1117 if (v == SEQ_START_TOKEN)
1118 seq_printf(seq, "%-127s\n",
1119 " sl local_address rem_address st tx_queue "
1120 "rx_queue tr tm->when retrnsmt uid timeout "
1121 "inode ref pointer drops");
1123 struct ping_iter_state *state = seq->private;
1126 ping_format_sock(v, seq, state->bucket, &len);
1127 seq_printf(seq, "%*s\n", 127 - len, "");
1132 static const struct seq_operations ping_seq_ops = {
1133 .show = ping_seq_show,
1134 .start = ping_seq_start,
1135 .next = ping_seq_next,
1136 .stop = ping_seq_stop,
1139 static int ping_seq_open(struct inode *inode, struct file *file)
1141 return seq_open_net(inode, file, &ping_seq_ops,
1142 sizeof(struct ping_iter_state));
1145 static const struct file_operations ping_seq_fops = {
1146 .open = ping_seq_open,
1148 .llseek = seq_lseek,
1149 .release = seq_release_net,
1152 static int ping_proc_register(struct net *net)
1154 struct proc_dir_entry *p;
1157 p = proc_create("icmp", S_IRUGO, net->proc_net, &ping_seq_fops);
1163 static void ping_proc_unregister(struct net *net)
1165 remove_proc_entry("icmp", net->proc_net);
1169 static int __net_init ping_proc_init_net(struct net *net)
1171 return ping_proc_register(net);
1174 static void __net_exit ping_proc_exit_net(struct net *net)
1176 ping_proc_unregister(net);
1179 static struct pernet_operations ping_net_ops = {
1180 .init = ping_proc_init_net,
1181 .exit = ping_proc_exit_net,
1184 int __init ping_proc_init(void)
1186 return register_pernet_subsys(&ping_net_ops);
1189 void ping_proc_exit(void)
1191 unregister_pernet_subsys(&ping_net_ops);
1196 void __init ping_init(void)
1200 for (i = 0; i < PING_HTABLE_SIZE; i++)
1201 INIT_HLIST_NULLS_HEAD(&ping_table.hash[i], i);
1202 rwlock_init(&ping_table.lock);