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 hlist_nulls_head hash[PING_HTABLE_SIZE];
61 static struct ping_table ping_table;
62 struct pingv6_ops pingv6_ops;
63 EXPORT_SYMBOL_GPL(pingv6_ops);
65 static u16 ping_port_rover;
67 static inline u32 ping_hashfn(const struct net *net, u32 num, u32 mask)
69 u32 res = (num + net_hash_mix(net)) & mask;
71 pr_debug("hash(%u) = %u\n", num, res);
74 EXPORT_SYMBOL_GPL(ping_hash);
76 static inline struct hlist_nulls_head *ping_hashslot(struct ping_table *table,
77 struct net *net, unsigned int num)
79 return &table->hash[ping_hashfn(net, num, PING_HTABLE_MASK)];
82 int ping_get_port(struct sock *sk, unsigned short ident)
84 struct hlist_nulls_node *node;
85 struct hlist_nulls_head *hlist;
86 struct inet_sock *isk, *isk2;
87 struct sock *sk2 = NULL;
90 write_lock_bh(&ping_table.lock);
93 u16 result = ping_port_rover + 1;
95 for (i = 0; i < (1L << 16); i++, result++) {
97 result++; /* avoid zero */
98 hlist = ping_hashslot(&ping_table, sock_net(sk),
100 ping_portaddr_for_each_entry(sk2, node, hlist) {
103 if (isk2->inet_num == result)
108 ping_port_rover = ident = result;
116 hlist = ping_hashslot(&ping_table, sock_net(sk), ident);
117 ping_portaddr_for_each_entry(sk2, node, hlist) {
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.
124 if ((isk2->inet_num == ident) &&
126 (!sk2->sk_reuse || !sk->sk_reuse))
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");
136 hlist_nulls_add_head(&sk->sk_nulls_node, hlist);
137 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
139 write_unlock_bh(&ping_table.lock);
143 write_unlock_bh(&ping_table.lock);
146 EXPORT_SYMBOL_GPL(ping_get_port);
148 int ping_hash(struct sock *sk)
150 pr_debug("ping_hash(sk->port=%u)\n", inet_sk(sk)->inet_num);
151 BUG(); /* "Please do not press this button again." */
156 void ping_unhash(struct sock *sk)
158 struct inet_sock *isk = inet_sk(sk);
160 pr_debug("ping_unhash(isk=%p,isk->num=%u)\n", isk, isk->inet_num);
161 write_lock_bh(&ping_table.lock);
163 hlist_nulls_del(&sk->sk_nulls_node);
164 sk_nulls_node_init(&sk->sk_nulls_node);
168 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
170 write_unlock_bh(&ping_table.lock);
172 EXPORT_SYMBOL_GPL(ping_unhash);
174 static struct sock *ping_lookup(struct net *net, struct sk_buff *skb, u16 ident)
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;
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);
192 read_lock_bh(&ping_table.lock);
194 ping_portaddr_for_each_entry(sk, hnode, hslot) {
197 pr_debug("iterate\n");
198 if (isk->inet_num != ident)
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);
207 if (isk->inet_rcv_saddr &&
208 isk->inet_rcv_saddr != ip_hdr(skb)->daddr)
210 #if IS_ENABLED(CONFIG_IPV6)
211 } else if (skb->protocol == htons(ETH_P_IPV6) &&
212 sk->sk_family == AF_INET6) {
214 pr_debug("found: %p: num=%d, daddr=%pI6c, dif=%d\n", sk,
216 &sk->sk_v6_rcv_saddr,
217 sk->sk_bound_dev_if);
219 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) &&
220 !ipv6_addr_equal(&sk->sk_v6_rcv_saddr,
221 &ipv6_hdr(skb)->daddr))
228 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)
237 read_unlock_bh(&ping_table.lock);
242 static void inet_get_ping_group_range_net(struct net *net, kgid_t *low,
245 kgid_t *data = net->ipv4.ping_group_range.range;
249 seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
253 } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
257 int ping_init_sock(struct sock *sk)
259 struct net *net = sock_net(sk);
260 kgid_t group = current_egid();
261 struct group_info *group_info;
266 if (sk->sk_family == AF_INET6)
269 inet_get_ping_group_range_net(net, &low, &high);
270 if (gid_lte(low, group) && gid_lte(group, high))
273 group_info = get_current_groups();
274 for (i = 0; i < group_info->ngroups; i++) {
275 kgid_t gid = group_info->gid[i];
277 if (gid_lte(low, gid) && gid_lte(gid, high))
278 goto out_release_group;
284 put_group_info(group_info);
287 EXPORT_SYMBOL_GPL(ping_init_sock);
289 void ping_close(struct sock *sk, long timeout)
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", sk->sk_refcnt.counter);
295 sk_common_release(sk);
297 EXPORT_SYMBOL_GPL(ping_close);
299 /* Checks the bind address and possibly modifies sk->sk_bound_dev_if. */
300 static 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 u32 tb_id = RT_TABLE_LOCAL;
308 if (addr_len < sizeof(*addr))
311 if (addr->sin_family != AF_INET &&
312 !(addr->sin_family == AF_UNSPEC &&
313 addr->sin_addr.s_addr == htonl(INADDR_ANY)))
314 return -EAFNOSUPPORT;
316 pr_debug("ping_check_bind_addr(sk=%p,addr=%pI4,port=%d)\n",
317 sk, &addr->sin_addr.s_addr, ntohs(addr->sin_port));
319 tb_id = l3mdev_fib_table_by_index(net, sk->sk_bound_dev_if) ? : tb_id;
320 chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id);
322 if (addr->sin_addr.s_addr == htonl(INADDR_ANY))
323 chk_addr_ret = RTN_LOCAL;
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;
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;
338 if (addr_len < sizeof(*addr))
341 if (addr->sin6_family != AF_INET6)
342 return -EAFNOSUPPORT;
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));
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))
355 if (addr->sin6_scope_id) {
356 dev = dev_get_by_index_rcu(net, addr->sin6_scope_id);
363 if (!dev && sk->sk_bound_dev_if) {
364 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
370 has_addr = pingv6_ops.ipv6_chk_addr(net, &addr->sin6_addr, dev,
374 if (!(net->ipv6.sysctl.ip_nonlocal_bind ||
375 isk->freebind || isk->transparent || has_addr ||
376 addr_type == IPV6_ADDR_ANY))
377 return -EADDRNOTAVAIL;
380 sk->sk_bound_dev_if = addr->sin6_scope_id;
383 return -EAFNOSUPPORT;
388 static void ping_set_saddr(struct sock *sk, struct sockaddr *saddr)
390 if (saddr->sa_family == AF_INET) {
391 struct inet_sock *isk = inet_sk(sk);
392 struct sockaddr_in *addr = (struct sockaddr_in *) saddr;
393 isk->inet_rcv_saddr = isk->inet_saddr = addr->sin_addr.s_addr;
394 #if IS_ENABLED(CONFIG_IPV6)
395 } else if (saddr->sa_family == AF_INET6) {
396 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) saddr;
397 struct ipv6_pinfo *np = inet6_sk(sk);
398 sk->sk_v6_rcv_saddr = np->saddr = addr->sin6_addr;
403 static void ping_clear_saddr(struct sock *sk, int dif)
405 sk->sk_bound_dev_if = dif;
406 if (sk->sk_family == AF_INET) {
407 struct inet_sock *isk = inet_sk(sk);
408 isk->inet_rcv_saddr = isk->inet_saddr = 0;
409 #if IS_ENABLED(CONFIG_IPV6)
410 } else if (sk->sk_family == AF_INET6) {
411 struct ipv6_pinfo *np = inet6_sk(sk);
412 memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr));
413 memset(&np->saddr, 0, sizeof(np->saddr));
418 * We need our own bind because there are no privileged id's == local ports.
419 * Moreover, we don't allow binding to multi- and broadcast addresses.
422 int ping_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
424 struct inet_sock *isk = inet_sk(sk);
427 int dif = sk->sk_bound_dev_if;
429 err = ping_check_bind_addr(sk, isk, uaddr, addr_len);
436 if (isk->inet_num != 0)
440 ping_set_saddr(sk, uaddr);
441 snum = ntohs(((struct sockaddr_in *)uaddr)->sin_port);
442 if (ping_get_port(sk, snum) != 0) {
443 ping_clear_saddr(sk, dif);
447 pr_debug("after bind(): num = %d, dif = %d\n",
449 (int)sk->sk_bound_dev_if);
452 if (sk->sk_family == AF_INET && isk->inet_rcv_saddr)
453 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
454 #if IS_ENABLED(CONFIG_IPV6)
455 if (sk->sk_family == AF_INET6 && !ipv6_addr_any(&sk->sk_v6_rcv_saddr))
456 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
460 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
461 isk->inet_sport = htons(isk->inet_num);
465 #if IS_ENABLED(CONFIG_IPV6)
466 if (sk->sk_family == AF_INET6)
467 memset(&sk->sk_v6_daddr, 0, sizeof(sk->sk_v6_daddr));
473 pr_debug("ping_v4_bind -> %d\n", err);
476 EXPORT_SYMBOL_GPL(ping_bind);
479 * Is this a supported type of ICMP message?
482 static inline int ping_supported(int family, int type, int code)
484 return (family == AF_INET && type == ICMP_ECHO && code == 0) ||
485 (family == AF_INET6 && type == ICMPV6_ECHO_REQUEST && code == 0);
489 * This routine is called by the ICMP module when it gets some
490 * sort of error condition.
493 void ping_err(struct sk_buff *skb, int offset, u32 info)
496 struct icmphdr *icmph;
497 struct inet_sock *inet_sock;
500 struct net *net = dev_net(skb->dev);
505 if (skb->protocol == htons(ETH_P_IP)) {
507 type = icmp_hdr(skb)->type;
508 code = icmp_hdr(skb)->code;
509 icmph = (struct icmphdr *)(skb->data + offset);
510 } else if (skb->protocol == htons(ETH_P_IPV6)) {
512 type = icmp6_hdr(skb)->icmp6_type;
513 code = icmp6_hdr(skb)->icmp6_code;
514 icmph = (struct icmphdr *) (skb->data + offset);
519 /* We assume the packet has already been checked by icmp_unreach */
521 if (!ping_supported(family, icmph->type, icmph->code))
524 pr_debug("ping_err(proto=0x%x,type=%d,code=%d,id=%04x,seq=%04x)\n",
525 skb->protocol, type, code, ntohs(icmph->un.echo.id),
526 ntohs(icmph->un.echo.sequence));
528 sk = ping_lookup(net, skb, ntohs(icmph->un.echo.id));
530 pr_debug("no socket, dropping\n");
531 return; /* No socket for error */
533 pr_debug("err on socket %p\n", sk);
537 inet_sock = inet_sk(sk);
539 if (skb->protocol == htons(ETH_P_IP)) {
542 case ICMP_TIME_EXCEEDED:
545 case ICMP_SOURCE_QUENCH:
546 /* This is not a real error but ping wants to see it.
547 * Report it with some fake errno.
551 case ICMP_PARAMETERPROB:
555 case ICMP_DEST_UNREACH:
556 if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */
557 ipv4_sk_update_pmtu(skb, sk, info);
558 if (inet_sock->pmtudisc != IP_PMTUDISC_DONT) {
566 if (code <= NR_ICMP_UNREACH) {
567 harderr = icmp_err_convert[code].fatal;
568 err = icmp_err_convert[code].errno;
572 /* See ICMP_SOURCE_QUENCH */
573 ipv4_sk_redirect(skb, sk);
577 #if IS_ENABLED(CONFIG_IPV6)
578 } else if (skb->protocol == htons(ETH_P_IPV6)) {
579 harderr = pingv6_ops.icmpv6_err_convert(type, code, &err);
584 * RFC1122: OK. Passes ICMP errors back to application, as per
587 if ((family == AF_INET && !inet_sock->recverr) ||
588 (family == AF_INET6 && !inet6_sk(sk)->recverr)) {
589 if (!harderr || sk->sk_state != TCP_ESTABLISHED)
592 if (family == AF_INET) {
593 ip_icmp_error(sk, skb, err, 0 /* no remote port */,
595 #if IS_ENABLED(CONFIG_IPV6)
596 } else if (family == AF_INET6) {
597 pingv6_ops.ipv6_icmp_error(sk, skb, err, 0,
603 sk->sk_error_report(sk);
607 EXPORT_SYMBOL_GPL(ping_err);
610 * Copy and checksum an ICMP Echo packet from user space into a buffer
611 * starting from the payload.
614 int ping_getfrag(void *from, char *to,
615 int offset, int fraglen, int odd, struct sk_buff *skb)
617 struct pingfakehdr *pfh = (struct pingfakehdr *)from;
620 fraglen -= sizeof(struct icmphdr);
623 if (csum_and_copy_from_iter(to + sizeof(struct icmphdr),
624 fraglen, &pfh->wcheck,
625 &pfh->msg->msg_iter) != fraglen)
627 } else if (offset < sizeof(struct icmphdr)) {
630 if (csum_and_copy_from_iter(to, fraglen, &pfh->wcheck,
631 &pfh->msg->msg_iter) != fraglen)
635 #if IS_ENABLED(CONFIG_IPV6)
636 /* For IPv6, checksum each skb as we go along, as expected by
637 * icmpv6_push_pending_frames. For IPv4, accumulate the checksum in
638 * wcheck, it will be finalized in ping_v4_push_pending_frames.
640 if (pfh->family == AF_INET6) {
641 skb->csum = pfh->wcheck;
642 skb->ip_summed = CHECKSUM_NONE;
649 EXPORT_SYMBOL_GPL(ping_getfrag);
651 static int ping_v4_push_pending_frames(struct sock *sk, struct pingfakehdr *pfh,
654 struct sk_buff *skb = skb_peek(&sk->sk_write_queue);
658 pfh->wcheck = csum_partial((char *)&pfh->icmph,
659 sizeof(struct icmphdr), pfh->wcheck);
660 pfh->icmph.checksum = csum_fold(pfh->wcheck);
661 memcpy(icmp_hdr(skb), &pfh->icmph, sizeof(struct icmphdr));
662 skb->ip_summed = CHECKSUM_NONE;
663 return ip_push_pending_frames(sk, fl4);
666 int ping_common_sendmsg(int family, struct msghdr *msg, size_t len,
667 void *user_icmph, size_t icmph_len) {
673 /* Must have at least a full ICMP header. */
681 /* Mirror BSD error message compatibility */
682 if (msg->msg_flags & MSG_OOB)
686 * Fetch the ICMP header provided by the userland.
687 * iovec is modified! The ICMP header is consumed.
689 if (memcpy_from_msg(user_icmph, msg, icmph_len))
692 if (family == AF_INET) {
693 type = ((struct icmphdr *) user_icmph)->type;
694 code = ((struct icmphdr *) user_icmph)->code;
695 #if IS_ENABLED(CONFIG_IPV6)
696 } else if (family == AF_INET6) {
697 type = ((struct icmp6hdr *) user_icmph)->icmp6_type;
698 code = ((struct icmp6hdr *) user_icmph)->icmp6_code;
704 if (!ping_supported(family, type, code))
709 EXPORT_SYMBOL_GPL(ping_common_sendmsg);
711 static int ping_v4_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
713 struct net *net = sock_net(sk);
715 struct inet_sock *inet = inet_sk(sk);
716 struct ipcm_cookie ipc;
717 struct icmphdr user_icmph;
718 struct pingfakehdr pfh;
719 struct rtable *rt = NULL;
720 struct ip_options_data opt_copy;
722 __be32 saddr, daddr, faddr;
726 pr_debug("ping_v4_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num);
728 err = ping_common_sendmsg(AF_INET, msg, len, &user_icmph,
734 * Get and verify the address.
738 DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name);
739 if (msg->msg_namelen < sizeof(*usin))
741 if (usin->sin_family != AF_INET)
742 return -EAFNOSUPPORT;
743 daddr = usin->sin_addr.s_addr;
746 if (sk->sk_state != TCP_ESTABLISHED)
747 return -EDESTADDRREQ;
748 daddr = inet->inet_daddr;
752 ipc.sockc.tsflags = sk->sk_tsflags;
753 ipc.addr = inet->inet_saddr;
755 ipc.oif = sk->sk_bound_dev_if;
760 if (msg->msg_controllen) {
761 err = ip_cmsg_send(sk, msg, &ipc, false);
770 struct ip_options_rcu *inet_opt;
773 inet_opt = rcu_dereference(inet->inet_opt);
775 memcpy(&opt_copy, inet_opt,
776 sizeof(*inet_opt) + inet_opt->opt.optlen);
777 ipc.opt = &opt_copy.opt;
782 sock_tx_timestamp(sk, ipc.sockc.tsflags, &ipc.tx_flags);
785 ipc.addr = faddr = daddr;
787 if (ipc.opt && ipc.opt->opt.srr) {
792 faddr = ipc.opt->opt.faddr;
794 tos = get_rttos(&ipc, inet);
795 if (sock_flag(sk, SOCK_LOCALROUTE) ||
796 (msg->msg_flags & MSG_DONTROUTE) ||
797 (ipc.opt && ipc.opt->opt.is_strictroute)) {
801 if (ipv4_is_multicast(daddr)) {
803 ipc.oif = inet->mc_index;
805 saddr = inet->mc_addr;
807 ipc.oif = inet->uc_index;
809 flowi4_init_output(&fl4, ipc.oif, sk->sk_mark, tos,
810 RT_SCOPE_UNIVERSE, sk->sk_protocol,
811 inet_sk_flowi_flags(sk), faddr, saddr, 0, 0);
813 fl4.fl4_icmp_type = user_icmph.type;
814 fl4.fl4_icmp_code = user_icmph.code;
816 security_sk_classify_flow(sk, flowi4_to_flowi(&fl4));
817 rt = ip_route_output_flow(net, &fl4, sk);
821 if (err == -ENETUNREACH)
822 IP_INC_STATS(net, IPSTATS_MIB_OUTNOROUTES);
827 if ((rt->rt_flags & RTCF_BROADCAST) &&
828 !sock_flag(sk, SOCK_BROADCAST))
831 if (msg->msg_flags & MSG_CONFIRM)
836 ipc.addr = fl4.daddr;
840 pfh.icmph.type = user_icmph.type; /* already checked */
841 pfh.icmph.code = user_icmph.code; /* ditto */
842 pfh.icmph.checksum = 0;
843 pfh.icmph.un.echo.id = inet->inet_sport;
844 pfh.icmph.un.echo.sequence = user_icmph.un.echo.sequence;
847 pfh.family = AF_INET;
849 err = ip_append_data(sk, &fl4, ping_getfrag, &pfh, len,
850 0, &ipc, &rt, msg->msg_flags);
852 ip_flush_pending_frames(sk);
854 err = ping_v4_push_pending_frames(sk, &pfh, &fl4);
863 icmp_out_count(sock_net(sk), user_icmph.type);
869 dst_confirm(&rt->dst);
870 if (!(msg->msg_flags & MSG_PROBE) || len)
871 goto back_from_confirm;
876 int ping_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int noblock,
877 int flags, int *addr_len)
879 struct inet_sock *isk = inet_sk(sk);
880 int family = sk->sk_family;
884 pr_debug("ping_recvmsg(sk=%p,sk->num=%u)\n", isk, isk->inet_num);
890 if (flags & MSG_ERRQUEUE)
891 return inet_recv_error(sk, msg, len, addr_len);
893 skb = skb_recv_datagram(sk, flags, noblock, &err);
899 msg->msg_flags |= MSG_TRUNC;
903 /* Don't bother checking the checksum */
904 err = skb_copy_datagram_msg(skb, 0, msg, copied);
908 sock_recv_timestamp(msg, sk, skb);
910 /* Copy the address and add cmsg data. */
911 if (family == AF_INET) {
912 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
915 sin->sin_family = AF_INET;
916 sin->sin_port = 0 /* skb->h.uh->source */;
917 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
918 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
919 *addr_len = sizeof(*sin);
923 ip_cmsg_recv(msg, skb);
925 #if IS_ENABLED(CONFIG_IPV6)
926 } else if (family == AF_INET6) {
927 struct ipv6_pinfo *np = inet6_sk(sk);
928 struct ipv6hdr *ip6 = ipv6_hdr(skb);
929 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
932 sin6->sin6_family = AF_INET6;
934 sin6->sin6_addr = ip6->saddr;
935 sin6->sin6_flowinfo = 0;
937 sin6->sin6_flowinfo = ip6_flowinfo(ip6);
938 sin6->sin6_scope_id =
939 ipv6_iface_scope_id(&sin6->sin6_addr,
941 *addr_len = sizeof(*sin6);
944 if (inet6_sk(sk)->rxopt.all)
945 pingv6_ops.ip6_datagram_recv_common_ctl(sk, msg, skb);
946 if (skb->protocol == htons(ETH_P_IPV6) &&
947 inet6_sk(sk)->rxopt.all)
948 pingv6_ops.ip6_datagram_recv_specific_ctl(sk, msg, skb);
949 else if (skb->protocol == htons(ETH_P_IP) && isk->cmsg_flags)
950 ip_cmsg_recv(msg, skb);
959 skb_free_datagram(sk, skb);
961 pr_debug("ping_recvmsg -> %d\n", err);
964 EXPORT_SYMBOL_GPL(ping_recvmsg);
966 int ping_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
968 pr_debug("ping_queue_rcv_skb(sk=%p,sk->num=%d,skb=%p)\n",
969 inet_sk(sk), inet_sk(sk)->inet_num, skb);
970 if (sock_queue_rcv_skb(sk, skb) < 0) {
972 pr_debug("ping_queue_rcv_skb -> failed\n");
977 EXPORT_SYMBOL_GPL(ping_queue_rcv_skb);
981 * All we need to do is get the socket.
984 bool ping_rcv(struct sk_buff *skb)
987 struct net *net = dev_net(skb->dev);
988 struct icmphdr *icmph = icmp_hdr(skb);
991 /* We assume the packet has already been checked by icmp_rcv */
993 pr_debug("ping_rcv(skb=%p,id=%04x,seq=%04x)\n",
994 skb, ntohs(icmph->un.echo.id), ntohs(icmph->un.echo.sequence));
996 /* Push ICMP header back */
997 skb_push(skb, skb->data - (u8 *)icmph);
999 sk = ping_lookup(net, skb, ntohs(icmph->un.echo.id));
1001 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
1003 pr_debug("rcv on socket %p\n", sk);
1004 if (skb2 && !ping_queue_rcv_skb(sk, skb2))
1010 pr_debug("no socket, dropping\n");
1014 EXPORT_SYMBOL_GPL(ping_rcv);
1016 struct proto ping_prot = {
1018 .owner = THIS_MODULE,
1019 .init = ping_init_sock,
1020 .close = ping_close,
1021 .connect = ip4_datagram_connect,
1022 .disconnect = __udp_disconnect,
1023 .setsockopt = ip_setsockopt,
1024 .getsockopt = ip_getsockopt,
1025 .sendmsg = ping_v4_sendmsg,
1026 .recvmsg = ping_recvmsg,
1028 .backlog_rcv = ping_queue_rcv_skb,
1029 .release_cb = ip4_datagram_release_cb,
1031 .unhash = ping_unhash,
1032 .get_port = ping_get_port,
1033 .obj_size = sizeof(struct inet_sock),
1035 EXPORT_SYMBOL(ping_prot);
1037 #ifdef CONFIG_PROC_FS
1039 static struct sock *ping_get_first(struct seq_file *seq, int start)
1042 struct ping_iter_state *state = seq->private;
1043 struct net *net = seq_file_net(seq);
1045 for (state->bucket = start; state->bucket < PING_HTABLE_SIZE;
1047 struct hlist_nulls_node *node;
1048 struct hlist_nulls_head *hslot;
1050 hslot = &ping_table.hash[state->bucket];
1052 if (hlist_nulls_empty(hslot))
1055 sk_nulls_for_each(sk, node, hslot) {
1056 if (net_eq(sock_net(sk), net) &&
1057 sk->sk_family == state->family)
1066 static struct sock *ping_get_next(struct seq_file *seq, struct sock *sk)
1068 struct ping_iter_state *state = seq->private;
1069 struct net *net = seq_file_net(seq);
1072 sk = sk_nulls_next(sk);
1073 } while (sk && (!net_eq(sock_net(sk), net)));
1076 return ping_get_first(seq, state->bucket + 1);
1080 static struct sock *ping_get_idx(struct seq_file *seq, loff_t pos)
1082 struct sock *sk = ping_get_first(seq, 0);
1085 while (pos && (sk = ping_get_next(seq, sk)) != NULL)
1087 return pos ? NULL : sk;
1090 void *ping_seq_start(struct seq_file *seq, loff_t *pos, sa_family_t family)
1091 __acquires(ping_table.lock)
1093 struct ping_iter_state *state = seq->private;
1095 state->family = family;
1097 read_lock_bh(&ping_table.lock);
1099 return *pos ? ping_get_idx(seq, *pos-1) : SEQ_START_TOKEN;
1101 EXPORT_SYMBOL_GPL(ping_seq_start);
1103 static void *ping_v4_seq_start(struct seq_file *seq, loff_t *pos)
1105 return ping_seq_start(seq, pos, AF_INET);
1108 void *ping_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1112 if (v == SEQ_START_TOKEN)
1113 sk = ping_get_idx(seq, 0);
1115 sk = ping_get_next(seq, v);
1120 EXPORT_SYMBOL_GPL(ping_seq_next);
1122 void ping_seq_stop(struct seq_file *seq, void *v)
1123 __releases(ping_table.lock)
1125 read_unlock_bh(&ping_table.lock);
1127 EXPORT_SYMBOL_GPL(ping_seq_stop);
1129 static void ping_v4_format_sock(struct sock *sp, struct seq_file *f,
1132 struct inet_sock *inet = inet_sk(sp);
1133 __be32 dest = inet->inet_daddr;
1134 __be32 src = inet->inet_rcv_saddr;
1135 __u16 destp = ntohs(inet->inet_dport);
1136 __u16 srcp = ntohs(inet->inet_sport);
1138 seq_printf(f, "%5d: %08X:%04X %08X:%04X"
1139 " %02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d",
1140 bucket, src, srcp, dest, destp, sp->sk_state,
1141 sk_wmem_alloc_get(sp),
1142 sk_rmem_alloc_get(sp),
1144 from_kuid_munged(seq_user_ns(f), sock_i_uid(sp)),
1146 atomic_read(&sp->sk_refcnt), sp,
1147 atomic_read(&sp->sk_drops));
1150 static int ping_v4_seq_show(struct seq_file *seq, void *v)
1152 seq_setwidth(seq, 127);
1153 if (v == SEQ_START_TOKEN)
1154 seq_puts(seq, " sl local_address rem_address st tx_queue "
1155 "rx_queue tr tm->when retrnsmt uid timeout "
1156 "inode ref pointer drops");
1158 struct ping_iter_state *state = seq->private;
1160 ping_v4_format_sock(v, seq, state->bucket);
1166 static int ping_seq_open(struct inode *inode, struct file *file)
1168 struct ping_seq_afinfo *afinfo = PDE_DATA(inode);
1169 return seq_open_net(inode, file, &afinfo->seq_ops,
1170 sizeof(struct ping_iter_state));
1173 const struct file_operations ping_seq_fops = {
1174 .open = ping_seq_open,
1176 .llseek = seq_lseek,
1177 .release = seq_release_net,
1179 EXPORT_SYMBOL_GPL(ping_seq_fops);
1181 static struct ping_seq_afinfo ping_v4_seq_afinfo = {
1184 .seq_fops = &ping_seq_fops,
1186 .start = ping_v4_seq_start,
1187 .show = ping_v4_seq_show,
1188 .next = ping_seq_next,
1189 .stop = ping_seq_stop,
1193 int ping_proc_register(struct net *net, struct ping_seq_afinfo *afinfo)
1195 struct proc_dir_entry *p;
1196 p = proc_create_data(afinfo->name, S_IRUGO, net->proc_net,
1197 afinfo->seq_fops, afinfo);
1202 EXPORT_SYMBOL_GPL(ping_proc_register);
1204 void ping_proc_unregister(struct net *net, struct ping_seq_afinfo *afinfo)
1206 remove_proc_entry(afinfo->name, net->proc_net);
1208 EXPORT_SYMBOL_GPL(ping_proc_unregister);
1210 static int __net_init ping_v4_proc_init_net(struct net *net)
1212 return ping_proc_register(net, &ping_v4_seq_afinfo);
1215 static void __net_exit ping_v4_proc_exit_net(struct net *net)
1217 ping_proc_unregister(net, &ping_v4_seq_afinfo);
1220 static struct pernet_operations ping_v4_net_ops = {
1221 .init = ping_v4_proc_init_net,
1222 .exit = ping_v4_proc_exit_net,
1225 int __init ping_proc_init(void)
1227 return register_pernet_subsys(&ping_v4_net_ops);
1230 void ping_proc_exit(void)
1232 unregister_pernet_subsys(&ping_v4_net_ops);
1237 void __init ping_init(void)
1241 for (i = 0; i < PING_HTABLE_SIZE; i++)
1242 INIT_HLIST_NULLS_HEAD(&ping_table.hash[i], i);
1243 rwlock_init(&ping_table.lock);