1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * INET An implementation of the TCP/IP protocol suite for the LINUX
4 * operating system. INET is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
9 * Based on ipv4/udp.c code.
11 * Authors: Vasiliy Kulikov / Openwall (for Linux 2.6),
12 * Pavel Kankovsky (for Linux 2.4.32)
14 * Pavel gave all rights to bugs to Vasiliy,
15 * none of the bugs are Pavel's now.
18 #include <linux/uaccess.h>
19 #include <linux/types.h>
20 #include <linux/fcntl.h>
21 #include <linux/socket.h>
22 #include <linux/sockios.h>
24 #include <linux/errno.h>
25 #include <linux/timer.h>
27 #include <linux/inet.h>
28 #include <linux/netdevice.h>
32 #include <net/protocol.h>
33 #include <linux/skbuff.h>
34 #include <linux/proc_fs.h>
35 #include <linux/export.h>
39 #include <net/route.h>
40 #include <net/inet_common.h>
41 #include <net/checksum.h>
43 #if IS_ENABLED(CONFIG_IPV6)
44 #include <linux/in6.h>
45 #include <linux/icmpv6.h>
46 #include <net/addrconf.h>
48 #include <net/transp_v6.h>
52 struct hlist_nulls_head hash[PING_HTABLE_SIZE];
56 static struct ping_table ping_table;
57 struct pingv6_ops pingv6_ops;
58 EXPORT_SYMBOL_GPL(pingv6_ops);
60 static u16 ping_port_rover;
62 static inline u32 ping_hashfn(const struct net *net, u32 num, u32 mask)
64 u32 res = (num + net_hash_mix(net)) & mask;
66 pr_debug("hash(%u) = %u\n", num, res);
69 EXPORT_SYMBOL_GPL(ping_hash);
71 static inline struct hlist_nulls_head *ping_hashslot(struct ping_table *table,
72 struct net *net, unsigned int num)
74 return &table->hash[ping_hashfn(net, num, PING_HTABLE_MASK)];
77 int ping_get_port(struct sock *sk, unsigned short ident)
79 struct hlist_nulls_node *node;
80 struct hlist_nulls_head *hlist;
81 struct inet_sock *isk, *isk2;
82 struct sock *sk2 = NULL;
85 write_lock_bh(&ping_table.lock);
88 u16 result = ping_port_rover + 1;
90 for (i = 0; i < (1L << 16); i++, result++) {
92 result++; /* avoid zero */
93 hlist = ping_hashslot(&ping_table, sock_net(sk),
95 ping_portaddr_for_each_entry(sk2, node, hlist) {
98 if (isk2->inet_num == result)
103 ping_port_rover = ident = result;
111 hlist = ping_hashslot(&ping_table, sock_net(sk), ident);
112 ping_portaddr_for_each_entry(sk2, node, hlist) {
115 /* BUG? Why is this reuse and not reuseaddr? ping.c
116 * doesn't turn off SO_REUSEADDR, and it doesn't expect
117 * that other ping processes can steal its packets.
119 if ((isk2->inet_num == ident) &&
121 (!sk2->sk_reuse || !sk->sk_reuse))
126 pr_debug("found port/ident = %d\n", ident);
127 isk->inet_num = ident;
128 if (sk_unhashed(sk)) {
129 pr_debug("was not hashed\n");
131 hlist_nulls_add_head(&sk->sk_nulls_node, hlist);
132 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
134 write_unlock_bh(&ping_table.lock);
138 write_unlock_bh(&ping_table.lock);
141 EXPORT_SYMBOL_GPL(ping_get_port);
143 int ping_hash(struct sock *sk)
145 pr_debug("ping_hash(sk->port=%u)\n", inet_sk(sk)->inet_num);
146 BUG(); /* "Please do not press this button again." */
151 void ping_unhash(struct sock *sk)
153 struct inet_sock *isk = inet_sk(sk);
155 pr_debug("ping_unhash(isk=%p,isk->num=%u)\n", isk, isk->inet_num);
156 write_lock_bh(&ping_table.lock);
158 hlist_nulls_del(&sk->sk_nulls_node);
159 sk_nulls_node_init(&sk->sk_nulls_node);
163 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
165 write_unlock_bh(&ping_table.lock);
167 EXPORT_SYMBOL_GPL(ping_unhash);
169 static struct sock *ping_lookup(struct net *net, struct sk_buff *skb, u16 ident)
171 struct hlist_nulls_head *hslot = ping_hashslot(&ping_table, net, ident);
172 struct sock *sk = NULL;
173 struct inet_sock *isk;
174 struct hlist_nulls_node *hnode;
177 if (skb->protocol == htons(ETH_P_IP)) {
179 sdif = inet_sdif(skb);
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 dif = inet6_iif(skb);
185 sdif = inet6_sdif(skb);
186 pr_debug("try to find: num = %d, daddr = %pI6c, dif = %d\n",
187 (int)ident, &ipv6_hdr(skb)->daddr, dif);
193 read_lock_bh(&ping_table.lock);
195 ping_portaddr_for_each_entry(sk, hnode, hslot) {
198 pr_debug("iterate\n");
199 if (isk->inet_num != ident)
202 if (skb->protocol == htons(ETH_P_IP) &&
203 sk->sk_family == AF_INET) {
204 pr_debug("found: %p: num=%d, daddr=%pI4, dif=%d\n", sk,
205 (int) isk->inet_num, &isk->inet_rcv_saddr,
206 sk->sk_bound_dev_if);
208 if (isk->inet_rcv_saddr &&
209 isk->inet_rcv_saddr != ip_hdr(skb)->daddr)
211 #if IS_ENABLED(CONFIG_IPV6)
212 } else if (skb->protocol == htons(ETH_P_IPV6) &&
213 sk->sk_family == AF_INET6) {
215 pr_debug("found: %p: num=%d, daddr=%pI6c, dif=%d\n", sk,
217 &sk->sk_v6_rcv_saddr,
218 sk->sk_bound_dev_if);
220 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) &&
221 !ipv6_addr_equal(&sk->sk_v6_rcv_saddr,
222 &ipv6_hdr(skb)->daddr))
229 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif &&
230 sk->sk_bound_dev_if != sdif)
239 read_unlock_bh(&ping_table.lock);
244 static void inet_get_ping_group_range_net(struct net *net, kgid_t *low,
247 kgid_t *data = net->ipv4.ping_group_range.range;
251 seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
255 } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
259 int ping_init_sock(struct sock *sk)
261 struct net *net = sock_net(sk);
262 kgid_t group = current_egid();
263 struct group_info *group_info;
268 if (sk->sk_family == AF_INET6)
271 inet_get_ping_group_range_net(net, &low, &high);
272 if (gid_lte(low, group) && gid_lte(group, high))
275 group_info = get_current_groups();
276 for (i = 0; i < group_info->ngroups; i++) {
277 kgid_t gid = group_info->gid[i];
279 if (gid_lte(low, gid) && gid_lte(gid, high))
280 goto out_release_group;
286 put_group_info(group_info);
289 EXPORT_SYMBOL_GPL(ping_init_sock);
291 void ping_close(struct sock *sk, long timeout)
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", refcount_read(&sk->sk_refcnt));
297 sk_common_release(sk);
299 EXPORT_SYMBOL_GPL(ping_close);
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)
305 struct net *net = sock_net(sk);
306 if (sk->sk_family == AF_INET) {
307 struct sockaddr_in *addr = (struct sockaddr_in *) uaddr;
308 u32 tb_id = RT_TABLE_LOCAL;
311 if (addr_len < sizeof(*addr))
314 if (addr->sin_family != AF_INET &&
315 !(addr->sin_family == AF_UNSPEC &&
316 addr->sin_addr.s_addr == htonl(INADDR_ANY)))
317 return -EAFNOSUPPORT;
319 pr_debug("ping_check_bind_addr(sk=%p,addr=%pI4,port=%d)\n",
320 sk, &addr->sin_addr.s_addr, ntohs(addr->sin_port));
322 if (addr->sin_addr.s_addr == htonl(INADDR_ANY))
325 tb_id = l3mdev_fib_table_by_index(net, sk->sk_bound_dev_if) ? : tb_id;
326 chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id);
328 if (chk_addr_ret == RTN_MULTICAST ||
329 chk_addr_ret == RTN_BROADCAST ||
330 (chk_addr_ret != RTN_LOCAL &&
331 !inet_can_nonlocal_bind(net, isk)))
332 return -EADDRNOTAVAIL;
334 #if IS_ENABLED(CONFIG_IPV6)
335 } else if (sk->sk_family == AF_INET6) {
336 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr;
337 int addr_type, scoped, has_addr;
338 struct net_device *dev = NULL;
340 if (addr_len < sizeof(*addr))
343 if (addr->sin6_family != AF_INET6)
344 return -EAFNOSUPPORT;
346 pr_debug("ping_check_bind_addr(sk=%p,addr=%pI6c,port=%d)\n",
347 sk, addr->sin6_addr.s6_addr, ntohs(addr->sin6_port));
349 addr_type = ipv6_addr_type(&addr->sin6_addr);
350 scoped = __ipv6_addr_needs_scope_id(addr_type);
351 if ((addr_type != IPV6_ADDR_ANY &&
352 !(addr_type & IPV6_ADDR_UNICAST)) ||
353 (scoped && !addr->sin6_scope_id))
357 if (addr->sin6_scope_id) {
358 dev = dev_get_by_index_rcu(net, addr->sin6_scope_id);
365 if (!dev && sk->sk_bound_dev_if) {
366 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
372 has_addr = pingv6_ops.ipv6_chk_addr(net, &addr->sin6_addr, dev,
376 if (!(ipv6_can_nonlocal_bind(net, isk) || has_addr ||
377 addr_type == IPV6_ADDR_ANY))
378 return -EADDRNOTAVAIL;
381 sk->sk_bound_dev_if = addr->sin6_scope_id;
384 return -EAFNOSUPPORT;
389 static void ping_set_saddr(struct sock *sk, struct sockaddr *saddr)
391 if (saddr->sa_family == AF_INET) {
392 struct inet_sock *isk = inet_sk(sk);
393 struct sockaddr_in *addr = (struct sockaddr_in *) saddr;
394 isk->inet_rcv_saddr = isk->inet_saddr = addr->sin_addr.s_addr;
395 #if IS_ENABLED(CONFIG_IPV6)
396 } else if (saddr->sa_family == AF_INET6) {
397 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) saddr;
398 struct ipv6_pinfo *np = inet6_sk(sk);
399 sk->sk_v6_rcv_saddr = np->saddr = addr->sin6_addr;
405 * We need our own bind because there are no privileged id's == local ports.
406 * Moreover, we don't allow binding to multi- and broadcast addresses.
409 int ping_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
411 struct inet_sock *isk = inet_sk(sk);
414 int dif = sk->sk_bound_dev_if;
416 err = ping_check_bind_addr(sk, isk, uaddr, addr_len);
423 if (isk->inet_num != 0)
427 snum = ntohs(((struct sockaddr_in *)uaddr)->sin_port);
428 if (ping_get_port(sk, snum) != 0) {
429 /* Restore possibly modified sk->sk_bound_dev_if by ping_check_bind_addr(). */
430 sk->sk_bound_dev_if = dif;
433 ping_set_saddr(sk, uaddr);
435 pr_debug("after bind(): num = %hu, dif = %d\n",
437 sk->sk_bound_dev_if);
440 if (sk->sk_family == AF_INET && isk->inet_rcv_saddr)
441 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
442 #if IS_ENABLED(CONFIG_IPV6)
443 if (sk->sk_family == AF_INET6 && !ipv6_addr_any(&sk->sk_v6_rcv_saddr))
444 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
448 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
449 isk->inet_sport = htons(isk->inet_num);
453 #if IS_ENABLED(CONFIG_IPV6)
454 if (sk->sk_family == AF_INET6)
455 memset(&sk->sk_v6_daddr, 0, sizeof(sk->sk_v6_daddr));
461 pr_debug("ping_v4_bind -> %d\n", err);
464 EXPORT_SYMBOL_GPL(ping_bind);
467 * Is this a supported type of ICMP message?
470 static inline int ping_supported(int family, int type, int code)
472 return (family == AF_INET && type == ICMP_ECHO && code == 0) ||
473 (family == AF_INET && type == ICMP_EXT_ECHO && code == 0) ||
474 (family == AF_INET6 && type == ICMPV6_ECHO_REQUEST && code == 0) ||
475 (family == AF_INET6 && type == ICMPV6_EXT_ECHO_REQUEST && code == 0);
479 * This routine is called by the ICMP module when it gets some
480 * sort of error condition.
483 void ping_err(struct sk_buff *skb, int offset, u32 info)
486 struct icmphdr *icmph;
487 struct inet_sock *inet_sock;
490 struct net *net = dev_net(skb->dev);
495 if (skb->protocol == htons(ETH_P_IP)) {
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)) {
502 type = icmp6_hdr(skb)->icmp6_type;
503 code = icmp6_hdr(skb)->icmp6_code;
504 icmph = (struct icmphdr *) (skb->data + offset);
509 /* We assume the packet has already been checked by icmp_unreach */
511 if (!ping_supported(family, icmph->type, icmph->code))
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));
518 sk = ping_lookup(net, skb, ntohs(icmph->un.echo.id));
520 pr_debug("no socket, dropping\n");
521 return; /* No socket for error */
523 pr_debug("err on socket %p\n", sk);
527 inet_sock = inet_sk(sk);
529 if (skb->protocol == htons(ETH_P_IP)) {
532 case ICMP_TIME_EXCEEDED:
535 case ICMP_SOURCE_QUENCH:
536 /* This is not a real error but ping wants to see it.
537 * Report it with some fake errno.
541 case ICMP_PARAMETERPROB:
545 case ICMP_DEST_UNREACH:
546 if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */
547 ipv4_sk_update_pmtu(skb, sk, info);
548 if (inet_sock->pmtudisc != IP_PMTUDISC_DONT) {
556 if (code <= NR_ICMP_UNREACH) {
557 harderr = icmp_err_convert[code].fatal;
558 err = icmp_err_convert[code].errno;
562 /* See ICMP_SOURCE_QUENCH */
563 ipv4_sk_redirect(skb, sk);
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);
574 * RFC1122: OK. Passes ICMP errors back to application, as per
577 if ((family == AF_INET && !inet_sock->recverr) ||
578 (family == AF_INET6 && !inet6_sk(sk)->recverr)) {
579 if (!harderr || sk->sk_state != TCP_ESTABLISHED)
582 if (family == AF_INET) {
583 ip_icmp_error(sk, skb, err, 0 /* no remote port */,
585 #if IS_ENABLED(CONFIG_IPV6)
586 } else if (family == AF_INET6) {
587 pingv6_ops.ipv6_icmp_error(sk, skb, err, 0,
597 EXPORT_SYMBOL_GPL(ping_err);
600 * Copy and checksum an ICMP Echo packet from user space into a buffer
601 * starting from the payload.
604 int ping_getfrag(void *from, char *to,
605 int offset, int fraglen, int odd, struct sk_buff *skb)
607 struct pingfakehdr *pfh = from;
610 fraglen -= sizeof(struct icmphdr);
613 if (!csum_and_copy_from_iter_full(to + sizeof(struct icmphdr),
614 fraglen, &pfh->wcheck,
615 &pfh->msg->msg_iter))
617 } else if (offset < sizeof(struct icmphdr)) {
620 if (!csum_and_copy_from_iter_full(to, fraglen, &pfh->wcheck,
621 &pfh->msg->msg_iter))
625 #if IS_ENABLED(CONFIG_IPV6)
626 /* For IPv6, checksum each skb as we go along, as expected by
627 * icmpv6_push_pending_frames. For IPv4, accumulate the checksum in
628 * wcheck, it will be finalized in ping_v4_push_pending_frames.
630 if (pfh->family == AF_INET6) {
631 skb->csum = pfh->wcheck;
632 skb->ip_summed = CHECKSUM_NONE;
639 EXPORT_SYMBOL_GPL(ping_getfrag);
641 static int ping_v4_push_pending_frames(struct sock *sk, struct pingfakehdr *pfh,
644 struct sk_buff *skb = skb_peek(&sk->sk_write_queue);
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);
656 int ping_common_sendmsg(int family, struct msghdr *msg, size_t len,
657 void *user_icmph, size_t icmph_len)
664 /* Must have at least a full ICMP header. */
672 /* Mirror BSD error message compatibility */
673 if (msg->msg_flags & MSG_OOB)
677 * Fetch the ICMP header provided by the userland.
678 * iovec is modified! The ICMP header is consumed.
680 if (memcpy_from_msg(user_icmph, msg, icmph_len))
683 if (family == AF_INET) {
684 type = ((struct icmphdr *) user_icmph)->type;
685 code = ((struct icmphdr *) user_icmph)->code;
686 #if IS_ENABLED(CONFIG_IPV6)
687 } else if (family == AF_INET6) {
688 type = ((struct icmp6hdr *) user_icmph)->icmp6_type;
689 code = ((struct icmp6hdr *) user_icmph)->icmp6_code;
695 if (!ping_supported(family, type, code))
700 EXPORT_SYMBOL_GPL(ping_common_sendmsg);
702 static int ping_v4_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
704 struct net *net = sock_net(sk);
706 struct inet_sock *inet = inet_sk(sk);
707 struct ipcm_cookie ipc;
708 struct icmphdr user_icmph;
709 struct pingfakehdr pfh;
710 struct rtable *rt = NULL;
711 struct ip_options_data opt_copy;
713 __be32 saddr, daddr, faddr;
717 pr_debug("ping_v4_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num);
719 err = ping_common_sendmsg(AF_INET, msg, len, &user_icmph,
725 * Get and verify the address.
729 DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name);
730 if (msg->msg_namelen < sizeof(*usin))
732 if (usin->sin_family != AF_INET)
733 return -EAFNOSUPPORT;
734 daddr = usin->sin_addr.s_addr;
737 if (sk->sk_state != TCP_ESTABLISHED)
738 return -EDESTADDRREQ;
739 daddr = inet->inet_daddr;
743 ipcm_init_sk(&ipc, inet);
745 if (msg->msg_controllen) {
746 err = ip_cmsg_send(sk, msg, &ipc, false);
755 struct ip_options_rcu *inet_opt;
758 inet_opt = rcu_dereference(inet->inet_opt);
760 memcpy(&opt_copy, inet_opt,
761 sizeof(*inet_opt) + inet_opt->opt.optlen);
762 ipc.opt = &opt_copy.opt;
768 ipc.addr = faddr = daddr;
770 if (ipc.opt && ipc.opt->opt.srr) {
775 faddr = ipc.opt->opt.faddr;
777 tos = get_rttos(&ipc, inet);
778 if (sock_flag(sk, SOCK_LOCALROUTE) ||
779 (msg->msg_flags & MSG_DONTROUTE) ||
780 (ipc.opt && ipc.opt->opt.is_strictroute)) {
784 if (ipv4_is_multicast(daddr)) {
785 if (!ipc.oif || netif_index_is_l3_master(sock_net(sk), ipc.oif))
786 ipc.oif = inet->mc_index;
788 saddr = inet->mc_addr;
790 ipc.oif = inet->uc_index;
792 flowi4_init_output(&fl4, ipc.oif, ipc.sockc.mark, tos,
793 RT_SCOPE_UNIVERSE, sk->sk_protocol,
794 inet_sk_flowi_flags(sk), faddr, saddr, 0, 0,
797 fl4.fl4_icmp_type = user_icmph.type;
798 fl4.fl4_icmp_code = user_icmph.code;
800 security_sk_classify_flow(sk, flowi4_to_flowi_common(&fl4));
801 rt = ip_route_output_flow(net, &fl4, sk);
805 if (err == -ENETUNREACH)
806 IP_INC_STATS(net, IPSTATS_MIB_OUTNOROUTES);
811 if ((rt->rt_flags & RTCF_BROADCAST) &&
812 !sock_flag(sk, SOCK_BROADCAST))
815 if (msg->msg_flags & MSG_CONFIRM)
820 ipc.addr = fl4.daddr;
824 pfh.icmph.type = user_icmph.type; /* already checked */
825 pfh.icmph.code = user_icmph.code; /* ditto */
826 pfh.icmph.checksum = 0;
827 pfh.icmph.un.echo.id = inet->inet_sport;
828 pfh.icmph.un.echo.sequence = user_icmph.un.echo.sequence;
831 pfh.family = AF_INET;
833 err = ip_append_data(sk, &fl4, ping_getfrag, &pfh, len,
834 0, &ipc, &rt, msg->msg_flags);
836 ip_flush_pending_frames(sk);
838 err = ping_v4_push_pending_frames(sk, &pfh, &fl4);
847 icmp_out_count(sock_net(sk), user_icmph.type);
853 if (msg->msg_flags & MSG_PROBE)
854 dst_confirm_neigh(&rt->dst, &fl4.daddr);
855 if (!(msg->msg_flags & MSG_PROBE) || len)
856 goto back_from_confirm;
861 int ping_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int flags,
864 struct inet_sock *isk = inet_sk(sk);
865 int family = sk->sk_family;
869 pr_debug("ping_recvmsg(sk=%p,sk->num=%u)\n", isk, isk->inet_num);
875 if (flags & MSG_ERRQUEUE)
876 return inet_recv_error(sk, msg, len, addr_len);
878 skb = skb_recv_datagram(sk, flags, &err);
884 msg->msg_flags |= MSG_TRUNC;
888 /* Don't bother checking the checksum */
889 err = skb_copy_datagram_msg(skb, 0, msg, copied);
893 sock_recv_timestamp(msg, sk, skb);
895 /* Copy the address and add cmsg data. */
896 if (family == AF_INET) {
897 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
900 sin->sin_family = AF_INET;
901 sin->sin_port = 0 /* skb->h.uh->source */;
902 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
903 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
904 *addr_len = sizeof(*sin);
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 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, 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,
926 *addr_len = sizeof(*sin6);
929 if (inet6_sk(sk)->rxopt.all)
930 pingv6_ops.ip6_datagram_recv_common_ctl(sk, msg, skb);
931 if (skb->protocol == htons(ETH_P_IPV6) &&
932 inet6_sk(sk)->rxopt.all)
933 pingv6_ops.ip6_datagram_recv_specific_ctl(sk, msg, skb);
934 else if (skb->protocol == htons(ETH_P_IP) && isk->cmsg_flags)
935 ip_cmsg_recv(msg, skb);
944 skb_free_datagram(sk, skb);
946 pr_debug("ping_recvmsg -> %d\n", err);
949 EXPORT_SYMBOL_GPL(ping_recvmsg);
951 static enum skb_drop_reason __ping_queue_rcv_skb(struct sock *sk,
954 enum skb_drop_reason reason;
956 pr_debug("ping_queue_rcv_skb(sk=%p,sk->num=%d,skb=%p)\n",
957 inet_sk(sk), inet_sk(sk)->inet_num, skb);
958 if (sock_queue_rcv_skb_reason(sk, skb, &reason) < 0) {
959 kfree_skb_reason(skb, reason);
960 pr_debug("ping_queue_rcv_skb -> failed\n");
963 return SKB_NOT_DROPPED_YET;
966 int ping_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
968 return __ping_queue_rcv_skb(sk, skb) ? -1 : 0;
970 EXPORT_SYMBOL_GPL(ping_queue_rcv_skb);
974 * All we need to do is get the socket.
977 enum skb_drop_reason ping_rcv(struct sk_buff *skb)
979 enum skb_drop_reason reason = SKB_DROP_REASON_NO_SOCKET;
981 struct net *net = dev_net(skb->dev);
982 struct icmphdr *icmph = icmp_hdr(skb);
984 /* We assume the packet has already been checked by icmp_rcv */
986 pr_debug("ping_rcv(skb=%p,id=%04x,seq=%04x)\n",
987 skb, ntohs(icmph->un.echo.id), ntohs(icmph->un.echo.sequence));
989 /* Push ICMP header back */
990 skb_push(skb, skb->data - (u8 *)icmph);
992 sk = ping_lookup(net, skb, ntohs(icmph->un.echo.id));
994 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
996 pr_debug("rcv on socket %p\n", sk);
998 reason = __ping_queue_rcv_skb(sk, skb2);
1000 reason = SKB_DROP_REASON_NOMEM;
1005 pr_debug("no socket, dropping\n");
1009 EXPORT_SYMBOL_GPL(ping_rcv);
1011 struct proto ping_prot = {
1013 .owner = THIS_MODULE,
1014 .init = ping_init_sock,
1015 .close = ping_close,
1016 .connect = ip4_datagram_connect,
1017 .disconnect = __udp_disconnect,
1018 .setsockopt = ip_setsockopt,
1019 .getsockopt = ip_getsockopt,
1020 .sendmsg = ping_v4_sendmsg,
1021 .recvmsg = ping_recvmsg,
1023 .backlog_rcv = ping_queue_rcv_skb,
1024 .release_cb = ip4_datagram_release_cb,
1026 .unhash = ping_unhash,
1027 .get_port = ping_get_port,
1028 .put_port = ping_unhash,
1029 .obj_size = sizeof(struct inet_sock),
1031 EXPORT_SYMBOL(ping_prot);
1033 #ifdef CONFIG_PROC_FS
1035 static struct sock *ping_get_first(struct seq_file *seq, int start)
1038 struct ping_iter_state *state = seq->private;
1039 struct net *net = seq_file_net(seq);
1041 for (state->bucket = start; state->bucket < PING_HTABLE_SIZE;
1043 struct hlist_nulls_node *node;
1044 struct hlist_nulls_head *hslot;
1046 hslot = &ping_table.hash[state->bucket];
1048 if (hlist_nulls_empty(hslot))
1051 sk_nulls_for_each(sk, node, hslot) {
1052 if (net_eq(sock_net(sk), net) &&
1053 sk->sk_family == state->family)
1062 static struct sock *ping_get_next(struct seq_file *seq, struct sock *sk)
1064 struct ping_iter_state *state = seq->private;
1065 struct net *net = seq_file_net(seq);
1068 sk = sk_nulls_next(sk);
1069 } while (sk && (!net_eq(sock_net(sk), net)));
1072 return ping_get_first(seq, state->bucket + 1);
1076 static struct sock *ping_get_idx(struct seq_file *seq, loff_t pos)
1078 struct sock *sk = ping_get_first(seq, 0);
1081 while (pos && (sk = ping_get_next(seq, sk)) != NULL)
1083 return pos ? NULL : sk;
1086 void *ping_seq_start(struct seq_file *seq, loff_t *pos, sa_family_t family)
1087 __acquires(ping_table.lock)
1089 struct ping_iter_state *state = seq->private;
1091 state->family = family;
1093 read_lock_bh(&ping_table.lock);
1095 return *pos ? ping_get_idx(seq, *pos-1) : SEQ_START_TOKEN;
1097 EXPORT_SYMBOL_GPL(ping_seq_start);
1099 static void *ping_v4_seq_start(struct seq_file *seq, loff_t *pos)
1101 return ping_seq_start(seq, pos, AF_INET);
1104 void *ping_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1108 if (v == SEQ_START_TOKEN)
1109 sk = ping_get_idx(seq, 0);
1111 sk = ping_get_next(seq, v);
1116 EXPORT_SYMBOL_GPL(ping_seq_next);
1118 void ping_seq_stop(struct seq_file *seq, void *v)
1119 __releases(ping_table.lock)
1121 read_unlock_bh(&ping_table.lock);
1123 EXPORT_SYMBOL_GPL(ping_seq_stop);
1125 static void ping_v4_format_sock(struct sock *sp, struct seq_file *f,
1128 struct inet_sock *inet = inet_sk(sp);
1129 __be32 dest = inet->inet_daddr;
1130 __be32 src = inet->inet_rcv_saddr;
1131 __u16 destp = ntohs(inet->inet_dport);
1132 __u16 srcp = ntohs(inet->inet_sport);
1134 seq_printf(f, "%5d: %08X:%04X %08X:%04X"
1135 " %02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %u",
1136 bucket, src, srcp, dest, destp, sp->sk_state,
1137 sk_wmem_alloc_get(sp),
1138 sk_rmem_alloc_get(sp),
1140 from_kuid_munged(seq_user_ns(f), sock_i_uid(sp)),
1142 refcount_read(&sp->sk_refcnt), sp,
1143 atomic_read(&sp->sk_drops));
1146 static int ping_v4_seq_show(struct seq_file *seq, void *v)
1148 seq_setwidth(seq, 127);
1149 if (v == SEQ_START_TOKEN)
1150 seq_puts(seq, " sl local_address rem_address st tx_queue "
1151 "rx_queue tr tm->when retrnsmt uid timeout "
1152 "inode ref pointer drops");
1154 struct ping_iter_state *state = seq->private;
1156 ping_v4_format_sock(v, seq, state->bucket);
1162 static const struct seq_operations ping_v4_seq_ops = {
1163 .start = ping_v4_seq_start,
1164 .show = ping_v4_seq_show,
1165 .next = ping_seq_next,
1166 .stop = ping_seq_stop,
1169 static int __net_init ping_v4_proc_init_net(struct net *net)
1171 if (!proc_create_net("icmp", 0444, net->proc_net, &ping_v4_seq_ops,
1172 sizeof(struct ping_iter_state)))
1177 static void __net_exit ping_v4_proc_exit_net(struct net *net)
1179 remove_proc_entry("icmp", net->proc_net);
1182 static struct pernet_operations ping_v4_net_ops = {
1183 .init = ping_v4_proc_init_net,
1184 .exit = ping_v4_proc_exit_net,
1187 int __init ping_proc_init(void)
1189 return register_pernet_subsys(&ping_v4_net_ops);
1192 void ping_proc_exit(void)
1194 unregister_pernet_subsys(&ping_v4_net_ops);
1199 void __init ping_init(void)
1203 for (i = 0; i < PING_HTABLE_SIZE; i++)
1204 INIT_HLIST_NULLS_HEAD(&ping_table.hash[i], i);
1205 rwlock_init(&ping_table.lock);