![Eric Dumazet](/assets/img/avatar_default.png)
ping module incorrectly increments ICMP_MIB_INERRORS if feeded with a frame not belonging to its own sockets. RFC 2011 states that ICMP_MIB_INERRORS should count "the number of ICMP messages which the entiry received but determined as having ICMP-specific errors (bad ICMP checksums, bad length, etc.)." Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> CC: Vasiliy Kulikov <segoon@openwall.com> Acked-by: Flavio Leitner <fbl@redhat.com> Acked-by: Vasiliy Kulikov <segoon@openwall.com> Signed-off-by: David S. Miller <davem@davemloft.net>
931 lines
21 KiB
C
931 lines
21 KiB
C
/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* "Ping" sockets
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Based on ipv4/udp.c code.
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*
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* Authors: Vasiliy Kulikov / Openwall (for Linux 2.6),
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* Pavel Kankovsky (for Linux 2.4.32)
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*
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* Pavel gave all rights to bugs to Vasiliy,
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* none of the bugs are Pavel's now.
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*
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*/
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#include <asm/system.h>
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#include <linux/uaccess.h>
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#include <linux/types.h>
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#include <linux/fcntl.h>
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#include <linux/socket.h>
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#include <linux/sockios.h>
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#include <linux/in.h>
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#include <linux/errno.h>
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#include <linux/timer.h>
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#include <linux/mm.h>
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#include <linux/inet.h>
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#include <linux/netdevice.h>
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#include <net/snmp.h>
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#include <net/ip.h>
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#include <net/ipv6.h>
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#include <net/icmp.h>
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#include <net/protocol.h>
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#include <linux/skbuff.h>
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#include <linux/proc_fs.h>
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#include <linux/export.h>
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#include <net/sock.h>
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#include <net/ping.h>
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#include <net/udp.h>
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#include <net/route.h>
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#include <net/inet_common.h>
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#include <net/checksum.h>
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static struct ping_table ping_table;
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static u16 ping_port_rover;
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static inline int ping_hashfn(struct net *net, unsigned num, unsigned mask)
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{
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int res = (num + net_hash_mix(net)) & mask;
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pr_debug("hash(%d) = %d\n", num, res);
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return res;
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}
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static inline struct hlist_nulls_head *ping_hashslot(struct ping_table *table,
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struct net *net, unsigned num)
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{
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return &table->hash[ping_hashfn(net, num, PING_HTABLE_MASK)];
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}
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static int ping_v4_get_port(struct sock *sk, unsigned short ident)
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{
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struct hlist_nulls_node *node;
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struct hlist_nulls_head *hlist;
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struct inet_sock *isk, *isk2;
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struct sock *sk2 = NULL;
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isk = inet_sk(sk);
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write_lock_bh(&ping_table.lock);
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if (ident == 0) {
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u32 i;
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u16 result = ping_port_rover + 1;
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for (i = 0; i < (1L << 16); i++, result++) {
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if (!result)
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result++; /* avoid zero */
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hlist = ping_hashslot(&ping_table, sock_net(sk),
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result);
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ping_portaddr_for_each_entry(sk2, node, hlist) {
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isk2 = inet_sk(sk2);
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if (isk2->inet_num == result)
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goto next_port;
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}
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/* found */
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ping_port_rover = ident = result;
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break;
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next_port:
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;
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}
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if (i >= (1L << 16))
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goto fail;
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} else {
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hlist = ping_hashslot(&ping_table, sock_net(sk), ident);
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ping_portaddr_for_each_entry(sk2, node, hlist) {
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isk2 = inet_sk(sk2);
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if ((isk2->inet_num == ident) &&
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(sk2 != sk) &&
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(!sk2->sk_reuse || !sk->sk_reuse))
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goto fail;
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}
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}
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pr_debug("found port/ident = %d\n", ident);
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isk->inet_num = ident;
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if (sk_unhashed(sk)) {
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pr_debug("was not hashed\n");
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sock_hold(sk);
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hlist_nulls_add_head(&sk->sk_nulls_node, hlist);
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sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
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}
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write_unlock_bh(&ping_table.lock);
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return 0;
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fail:
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write_unlock_bh(&ping_table.lock);
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return 1;
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}
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static void ping_v4_hash(struct sock *sk)
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{
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pr_debug("ping_v4_hash(sk->port=%u)\n", inet_sk(sk)->inet_num);
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BUG(); /* "Please do not press this button again." */
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}
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static void ping_v4_unhash(struct sock *sk)
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{
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struct inet_sock *isk = inet_sk(sk);
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pr_debug("ping_v4_unhash(isk=%p,isk->num=%u)\n", isk, isk->inet_num);
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if (sk_hashed(sk)) {
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write_lock_bh(&ping_table.lock);
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hlist_nulls_del(&sk->sk_nulls_node);
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sock_put(sk);
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isk->inet_num = isk->inet_sport = 0;
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sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
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write_unlock_bh(&ping_table.lock);
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}
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}
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static struct sock *ping_v4_lookup(struct net *net, u32 saddr, u32 daddr,
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u16 ident, int dif)
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{
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struct hlist_nulls_head *hslot = ping_hashslot(&ping_table, net, ident);
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struct sock *sk = NULL;
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struct inet_sock *isk;
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struct hlist_nulls_node *hnode;
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pr_debug("try to find: num = %d, daddr = %ld, dif = %d\n",
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(int)ident, (unsigned long)daddr, dif);
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read_lock_bh(&ping_table.lock);
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ping_portaddr_for_each_entry(sk, hnode, hslot) {
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isk = inet_sk(sk);
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pr_debug("found: %p: num = %d, daddr = %ld, dif = %d\n", sk,
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(int)isk->inet_num, (unsigned long)isk->inet_rcv_saddr,
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sk->sk_bound_dev_if);
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pr_debug("iterate\n");
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if (isk->inet_num != ident)
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continue;
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if (isk->inet_rcv_saddr && isk->inet_rcv_saddr != daddr)
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continue;
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if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)
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continue;
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sock_hold(sk);
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goto exit;
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}
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sk = NULL;
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exit:
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read_unlock_bh(&ping_table.lock);
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return sk;
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}
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static void inet_get_ping_group_range_net(struct net *net, gid_t *low,
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gid_t *high)
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{
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gid_t *data = net->ipv4.sysctl_ping_group_range;
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unsigned seq;
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do {
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seq = read_seqbegin(&sysctl_local_ports.lock);
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*low = data[0];
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*high = data[1];
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} while (read_seqretry(&sysctl_local_ports.lock, seq));
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}
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static int ping_init_sock(struct sock *sk)
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{
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struct net *net = sock_net(sk);
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gid_t group = current_egid();
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gid_t range[2];
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struct group_info *group_info = get_current_groups();
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int i, j, count = group_info->ngroups;
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inet_get_ping_group_range_net(net, range, range+1);
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if (range[0] <= group && group <= range[1])
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return 0;
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for (i = 0; i < group_info->nblocks; i++) {
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int cp_count = min_t(int, NGROUPS_PER_BLOCK, count);
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for (j = 0; j < cp_count; j++) {
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group = group_info->blocks[i][j];
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if (range[0] <= group && group <= range[1])
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return 0;
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}
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count -= cp_count;
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}
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return -EACCES;
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}
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static void ping_close(struct sock *sk, long timeout)
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{
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pr_debug("ping_close(sk=%p,sk->num=%u)\n",
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inet_sk(sk), inet_sk(sk)->inet_num);
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pr_debug("isk->refcnt = %d\n", sk->sk_refcnt.counter);
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sk_common_release(sk);
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}
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/*
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* We need our own bind because there are no privileged id's == local ports.
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* Moreover, we don't allow binding to multi- and broadcast addresses.
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*/
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static int ping_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
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{
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struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
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struct inet_sock *isk = inet_sk(sk);
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unsigned short snum;
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int chk_addr_ret;
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int err;
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if (addr_len < sizeof(struct sockaddr_in))
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return -EINVAL;
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pr_debug("ping_v4_bind(sk=%p,sa_addr=%08x,sa_port=%d)\n",
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sk, addr->sin_addr.s_addr, ntohs(addr->sin_port));
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chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr);
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if (addr->sin_addr.s_addr == INADDR_ANY)
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chk_addr_ret = RTN_LOCAL;
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if ((sysctl_ip_nonlocal_bind == 0 &&
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isk->freebind == 0 && isk->transparent == 0 &&
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chk_addr_ret != RTN_LOCAL) ||
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chk_addr_ret == RTN_MULTICAST ||
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chk_addr_ret == RTN_BROADCAST)
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return -EADDRNOTAVAIL;
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lock_sock(sk);
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err = -EINVAL;
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if (isk->inet_num != 0)
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goto out;
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err = -EADDRINUSE;
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isk->inet_rcv_saddr = isk->inet_saddr = addr->sin_addr.s_addr;
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snum = ntohs(addr->sin_port);
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if (ping_v4_get_port(sk, snum) != 0) {
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isk->inet_saddr = isk->inet_rcv_saddr = 0;
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goto out;
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}
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pr_debug("after bind(): num = %d, daddr = %ld, dif = %d\n",
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(int)isk->inet_num,
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(unsigned long) isk->inet_rcv_saddr,
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(int)sk->sk_bound_dev_if);
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err = 0;
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if (isk->inet_rcv_saddr)
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sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
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if (snum)
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sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
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isk->inet_sport = htons(isk->inet_num);
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isk->inet_daddr = 0;
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isk->inet_dport = 0;
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sk_dst_reset(sk);
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out:
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release_sock(sk);
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pr_debug("ping_v4_bind -> %d\n", err);
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return err;
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}
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/*
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* Is this a supported type of ICMP message?
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*/
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static inline int ping_supported(int type, int code)
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{
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if (type == ICMP_ECHO && code == 0)
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return 1;
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return 0;
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}
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/*
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* This routine is called by the ICMP module when it gets some
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* sort of error condition.
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*/
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static int ping_queue_rcv_skb(struct sock *sk, struct sk_buff *skb);
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void ping_err(struct sk_buff *skb, u32 info)
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{
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struct iphdr *iph = (struct iphdr *)skb->data;
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struct icmphdr *icmph = (struct icmphdr *)(skb->data+(iph->ihl<<2));
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struct inet_sock *inet_sock;
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int type = icmph->type;
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int code = icmph->code;
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struct net *net = dev_net(skb->dev);
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struct sock *sk;
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int harderr;
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int err;
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/* We assume the packet has already been checked by icmp_unreach */
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if (!ping_supported(icmph->type, icmph->code))
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return;
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pr_debug("ping_err(type=%04x,code=%04x,id=%04x,seq=%04x)\n", type,
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code, ntohs(icmph->un.echo.id), ntohs(icmph->un.echo.sequence));
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sk = ping_v4_lookup(net, iph->daddr, iph->saddr,
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ntohs(icmph->un.echo.id), skb->dev->ifindex);
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if (sk == NULL) {
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pr_debug("no socket, dropping\n");
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return; /* No socket for error */
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}
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pr_debug("err on socket %p\n", sk);
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err = 0;
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harderr = 0;
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inet_sock = inet_sk(sk);
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switch (type) {
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default:
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case ICMP_TIME_EXCEEDED:
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err = EHOSTUNREACH;
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break;
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case ICMP_SOURCE_QUENCH:
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/* This is not a real error but ping wants to see it.
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* Report it with some fake errno. */
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err = EREMOTEIO;
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break;
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case ICMP_PARAMETERPROB:
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err = EPROTO;
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harderr = 1;
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break;
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case ICMP_DEST_UNREACH:
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if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */
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if (inet_sock->pmtudisc != IP_PMTUDISC_DONT) {
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err = EMSGSIZE;
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harderr = 1;
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break;
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}
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goto out;
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}
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err = EHOSTUNREACH;
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if (code <= NR_ICMP_UNREACH) {
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harderr = icmp_err_convert[code].fatal;
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err = icmp_err_convert[code].errno;
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}
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break;
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case ICMP_REDIRECT:
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/* See ICMP_SOURCE_QUENCH */
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err = EREMOTEIO;
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break;
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}
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/*
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* RFC1122: OK. Passes ICMP errors back to application, as per
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* 4.1.3.3.
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*/
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if (!inet_sock->recverr) {
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if (!harderr || sk->sk_state != TCP_ESTABLISHED)
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goto out;
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} else {
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ip_icmp_error(sk, skb, err, 0 /* no remote port */,
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info, (u8 *)icmph);
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}
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sk->sk_err = err;
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sk->sk_error_report(sk);
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out:
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sock_put(sk);
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}
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/*
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* Copy and checksum an ICMP Echo packet from user space into a buffer.
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*/
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struct pingfakehdr {
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struct icmphdr icmph;
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struct iovec *iov;
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u32 wcheck;
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};
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|
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static int ping_getfrag(void *from, char * to,
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int offset, int fraglen, int odd, struct sk_buff *skb)
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{
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struct pingfakehdr *pfh = (struct pingfakehdr *)from;
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if (offset == 0) {
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if (fraglen < sizeof(struct icmphdr))
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BUG();
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if (csum_partial_copy_fromiovecend(to + sizeof(struct icmphdr),
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pfh->iov, 0, fraglen - sizeof(struct icmphdr),
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&pfh->wcheck))
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return -EFAULT;
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return 0;
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}
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if (offset < sizeof(struct icmphdr))
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BUG();
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if (csum_partial_copy_fromiovecend
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(to, pfh->iov, offset - sizeof(struct icmphdr),
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fraglen, &pfh->wcheck))
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return -EFAULT;
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return 0;
|
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}
|
|
|
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static int ping_push_pending_frames(struct sock *sk, struct pingfakehdr *pfh,
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struct flowi4 *fl4)
|
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{
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struct sk_buff *skb = skb_peek(&sk->sk_write_queue);
|
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|
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pfh->wcheck = csum_partial((char *)&pfh->icmph,
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sizeof(struct icmphdr), pfh->wcheck);
|
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pfh->icmph.checksum = csum_fold(pfh->wcheck);
|
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memcpy(icmp_hdr(skb), &pfh->icmph, sizeof(struct icmphdr));
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skb->ip_summed = CHECKSUM_NONE;
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return ip_push_pending_frames(sk, fl4);
|
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}
|
|
|
|
static int ping_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
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size_t len)
|
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{
|
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struct net *net = sock_net(sk);
|
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struct flowi4 fl4;
|
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struct inet_sock *inet = inet_sk(sk);
|
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struct ipcm_cookie ipc;
|
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struct icmphdr user_icmph;
|
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struct pingfakehdr pfh;
|
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struct rtable *rt = NULL;
|
|
struct ip_options_data opt_copy;
|
|
int free = 0;
|
|
u32 saddr, daddr, faddr;
|
|
u8 tos;
|
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int err;
|
|
|
|
pr_debug("ping_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num);
|
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|
|
|
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if (len > 0xFFFF)
|
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return -EMSGSIZE;
|
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|
|
/*
|
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* Check the flags.
|
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*/
|
|
|
|
/* Mirror BSD error message compatibility */
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if (msg->msg_flags & MSG_OOB)
|
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return -EOPNOTSUPP;
|
|
|
|
/*
|
|
* Fetch the ICMP header provided by the userland.
|
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* iovec is modified!
|
|
*/
|
|
|
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if (memcpy_fromiovec((u8 *)&user_icmph, msg->msg_iov,
|
|
sizeof(struct icmphdr)))
|
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return -EFAULT;
|
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if (!ping_supported(user_icmph.type, user_icmph.code))
|
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return -EINVAL;
|
|
|
|
/*
|
|
* Get and verify the address.
|
|
*/
|
|
|
|
if (msg->msg_name) {
|
|
struct sockaddr_in *usin = (struct sockaddr_in *)msg->msg_name;
|
|
if (msg->msg_namelen < sizeof(*usin))
|
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return -EINVAL;
|
|
if (usin->sin_family != AF_INET)
|
|
return -EINVAL;
|
|
daddr = usin->sin_addr.s_addr;
|
|
/* no remote port */
|
|
} else {
|
|
if (sk->sk_state != TCP_ESTABLISHED)
|
|
return -EDESTADDRREQ;
|
|
daddr = inet->inet_daddr;
|
|
/* no remote port */
|
|
}
|
|
|
|
ipc.addr = inet->inet_saddr;
|
|
ipc.opt = NULL;
|
|
ipc.oif = sk->sk_bound_dev_if;
|
|
ipc.tx_flags = 0;
|
|
err = sock_tx_timestamp(sk, &ipc.tx_flags);
|
|
if (err)
|
|
return err;
|
|
|
|
if (msg->msg_controllen) {
|
|
err = ip_cmsg_send(sock_net(sk), msg, &ipc);
|
|
if (err)
|
|
return err;
|
|
if (ipc.opt)
|
|
free = 1;
|
|
}
|
|
if (!ipc.opt) {
|
|
struct ip_options_rcu *inet_opt;
|
|
|
|
rcu_read_lock();
|
|
inet_opt = rcu_dereference(inet->inet_opt);
|
|
if (inet_opt) {
|
|
memcpy(&opt_copy, inet_opt,
|
|
sizeof(*inet_opt) + inet_opt->opt.optlen);
|
|
ipc.opt = &opt_copy.opt;
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
saddr = ipc.addr;
|
|
ipc.addr = faddr = daddr;
|
|
|
|
if (ipc.opt && ipc.opt->opt.srr) {
|
|
if (!daddr)
|
|
return -EINVAL;
|
|
faddr = ipc.opt->opt.faddr;
|
|
}
|
|
tos = RT_TOS(inet->tos);
|
|
if (sock_flag(sk, SOCK_LOCALROUTE) ||
|
|
(msg->msg_flags & MSG_DONTROUTE) ||
|
|
(ipc.opt && ipc.opt->opt.is_strictroute)) {
|
|
tos |= RTO_ONLINK;
|
|
}
|
|
|
|
if (ipv4_is_multicast(daddr)) {
|
|
if (!ipc.oif)
|
|
ipc.oif = inet->mc_index;
|
|
if (!saddr)
|
|
saddr = inet->mc_addr;
|
|
}
|
|
|
|
flowi4_init_output(&fl4, ipc.oif, sk->sk_mark, tos,
|
|
RT_SCOPE_UNIVERSE, sk->sk_protocol,
|
|
inet_sk_flowi_flags(sk), faddr, saddr, 0, 0);
|
|
|
|
security_sk_classify_flow(sk, flowi4_to_flowi(&fl4));
|
|
rt = ip_route_output_flow(net, &fl4, sk);
|
|
if (IS_ERR(rt)) {
|
|
err = PTR_ERR(rt);
|
|
rt = NULL;
|
|
if (err == -ENETUNREACH)
|
|
IP_INC_STATS_BH(net, IPSTATS_MIB_OUTNOROUTES);
|
|
goto out;
|
|
}
|
|
|
|
err = -EACCES;
|
|
if ((rt->rt_flags & RTCF_BROADCAST) &&
|
|
!sock_flag(sk, SOCK_BROADCAST))
|
|
goto out;
|
|
|
|
if (msg->msg_flags & MSG_CONFIRM)
|
|
goto do_confirm;
|
|
back_from_confirm:
|
|
|
|
if (!ipc.addr)
|
|
ipc.addr = fl4.daddr;
|
|
|
|
lock_sock(sk);
|
|
|
|
pfh.icmph.type = user_icmph.type; /* already checked */
|
|
pfh.icmph.code = user_icmph.code; /* ditto */
|
|
pfh.icmph.checksum = 0;
|
|
pfh.icmph.un.echo.id = inet->inet_sport;
|
|
pfh.icmph.un.echo.sequence = user_icmph.un.echo.sequence;
|
|
pfh.iov = msg->msg_iov;
|
|
pfh.wcheck = 0;
|
|
|
|
err = ip_append_data(sk, &fl4, ping_getfrag, &pfh, len,
|
|
0, &ipc, &rt, msg->msg_flags);
|
|
if (err)
|
|
ip_flush_pending_frames(sk);
|
|
else
|
|
err = ping_push_pending_frames(sk, &pfh, &fl4);
|
|
release_sock(sk);
|
|
|
|
out:
|
|
ip_rt_put(rt);
|
|
if (free)
|
|
kfree(ipc.opt);
|
|
if (!err) {
|
|
icmp_out_count(sock_net(sk), user_icmph.type);
|
|
return len;
|
|
}
|
|
return err;
|
|
|
|
do_confirm:
|
|
dst_confirm(&rt->dst);
|
|
if (!(msg->msg_flags & MSG_PROBE) || len)
|
|
goto back_from_confirm;
|
|
err = 0;
|
|
goto out;
|
|
}
|
|
|
|
static int ping_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
|
|
size_t len, int noblock, int flags, int *addr_len)
|
|
{
|
|
struct inet_sock *isk = inet_sk(sk);
|
|
struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name;
|
|
struct sk_buff *skb;
|
|
int copied, err;
|
|
|
|
pr_debug("ping_recvmsg(sk=%p,sk->num=%u)\n", isk, isk->inet_num);
|
|
|
|
if (flags & MSG_OOB)
|
|
goto out;
|
|
|
|
if (addr_len)
|
|
*addr_len = sizeof(*sin);
|
|
|
|
if (flags & MSG_ERRQUEUE)
|
|
return ip_recv_error(sk, msg, len);
|
|
|
|
skb = skb_recv_datagram(sk, flags, noblock, &err);
|
|
if (!skb)
|
|
goto out;
|
|
|
|
copied = skb->len;
|
|
if (copied > len) {
|
|
msg->msg_flags |= MSG_TRUNC;
|
|
copied = len;
|
|
}
|
|
|
|
/* Don't bother checking the checksum */
|
|
err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
|
|
if (err)
|
|
goto done;
|
|
|
|
sock_recv_timestamp(msg, sk, skb);
|
|
|
|
/* Copy the address. */
|
|
if (sin) {
|
|
sin->sin_family = AF_INET;
|
|
sin->sin_port = 0 /* skb->h.uh->source */;
|
|
sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
|
|
memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
|
|
}
|
|
if (isk->cmsg_flags)
|
|
ip_cmsg_recv(msg, skb);
|
|
err = copied;
|
|
|
|
done:
|
|
skb_free_datagram(sk, skb);
|
|
out:
|
|
pr_debug("ping_recvmsg -> %d\n", err);
|
|
return err;
|
|
}
|
|
|
|
static int ping_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
pr_debug("ping_queue_rcv_skb(sk=%p,sk->num=%d,skb=%p)\n",
|
|
inet_sk(sk), inet_sk(sk)->inet_num, skb);
|
|
if (sock_queue_rcv_skb(sk, skb) < 0) {
|
|
kfree_skb(skb);
|
|
pr_debug("ping_queue_rcv_skb -> failed\n");
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* All we need to do is get the socket.
|
|
*/
|
|
|
|
void ping_rcv(struct sk_buff *skb)
|
|
{
|
|
struct sock *sk;
|
|
struct net *net = dev_net(skb->dev);
|
|
struct iphdr *iph = ip_hdr(skb);
|
|
struct icmphdr *icmph = icmp_hdr(skb);
|
|
u32 saddr = iph->saddr;
|
|
u32 daddr = iph->daddr;
|
|
|
|
/* We assume the packet has already been checked by icmp_rcv */
|
|
|
|
pr_debug("ping_rcv(skb=%p,id=%04x,seq=%04x)\n",
|
|
skb, ntohs(icmph->un.echo.id), ntohs(icmph->un.echo.sequence));
|
|
|
|
/* Push ICMP header back */
|
|
skb_push(skb, skb->data - (u8 *)icmph);
|
|
|
|
sk = ping_v4_lookup(net, saddr, daddr, ntohs(icmph->un.echo.id),
|
|
skb->dev->ifindex);
|
|
if (sk != NULL) {
|
|
pr_debug("rcv on socket %p\n", sk);
|
|
ping_queue_rcv_skb(sk, skb_get(skb));
|
|
sock_put(sk);
|
|
return;
|
|
}
|
|
pr_debug("no socket, dropping\n");
|
|
|
|
/* We're called from icmp_rcv(). kfree_skb() is done there. */
|
|
}
|
|
|
|
struct proto ping_prot = {
|
|
.name = "PING",
|
|
.owner = THIS_MODULE,
|
|
.init = ping_init_sock,
|
|
.close = ping_close,
|
|
.connect = ip4_datagram_connect,
|
|
.disconnect = udp_disconnect,
|
|
.setsockopt = ip_setsockopt,
|
|
.getsockopt = ip_getsockopt,
|
|
.sendmsg = ping_sendmsg,
|
|
.recvmsg = ping_recvmsg,
|
|
.bind = ping_bind,
|
|
.backlog_rcv = ping_queue_rcv_skb,
|
|
.hash = ping_v4_hash,
|
|
.unhash = ping_v4_unhash,
|
|
.get_port = ping_v4_get_port,
|
|
.obj_size = sizeof(struct inet_sock),
|
|
};
|
|
EXPORT_SYMBOL(ping_prot);
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
|
|
static struct sock *ping_get_first(struct seq_file *seq, int start)
|
|
{
|
|
struct sock *sk;
|
|
struct ping_iter_state *state = seq->private;
|
|
struct net *net = seq_file_net(seq);
|
|
|
|
for (state->bucket = start; state->bucket < PING_HTABLE_SIZE;
|
|
++state->bucket) {
|
|
struct hlist_nulls_node *node;
|
|
struct hlist_nulls_head *hslot;
|
|
|
|
hslot = &ping_table.hash[state->bucket];
|
|
|
|
if (hlist_nulls_empty(hslot))
|
|
continue;
|
|
|
|
sk_nulls_for_each(sk, node, hslot) {
|
|
if (net_eq(sock_net(sk), net))
|
|
goto found;
|
|
}
|
|
}
|
|
sk = NULL;
|
|
found:
|
|
return sk;
|
|
}
|
|
|
|
static struct sock *ping_get_next(struct seq_file *seq, struct sock *sk)
|
|
{
|
|
struct ping_iter_state *state = seq->private;
|
|
struct net *net = seq_file_net(seq);
|
|
|
|
do {
|
|
sk = sk_nulls_next(sk);
|
|
} while (sk && (!net_eq(sock_net(sk), net)));
|
|
|
|
if (!sk)
|
|
return ping_get_first(seq, state->bucket + 1);
|
|
return sk;
|
|
}
|
|
|
|
static struct sock *ping_get_idx(struct seq_file *seq, loff_t pos)
|
|
{
|
|
struct sock *sk = ping_get_first(seq, 0);
|
|
|
|
if (sk)
|
|
while (pos && (sk = ping_get_next(seq, sk)) != NULL)
|
|
--pos;
|
|
return pos ? NULL : sk;
|
|
}
|
|
|
|
static void *ping_seq_start(struct seq_file *seq, loff_t *pos)
|
|
{
|
|
struct ping_iter_state *state = seq->private;
|
|
state->bucket = 0;
|
|
|
|
read_lock_bh(&ping_table.lock);
|
|
|
|
return *pos ? ping_get_idx(seq, *pos-1) : SEQ_START_TOKEN;
|
|
}
|
|
|
|
static void *ping_seq_next(struct seq_file *seq, void *v, loff_t *pos)
|
|
{
|
|
struct sock *sk;
|
|
|
|
if (v == SEQ_START_TOKEN)
|
|
sk = ping_get_idx(seq, 0);
|
|
else
|
|
sk = ping_get_next(seq, v);
|
|
|
|
++*pos;
|
|
return sk;
|
|
}
|
|
|
|
static void ping_seq_stop(struct seq_file *seq, void *v)
|
|
{
|
|
read_unlock_bh(&ping_table.lock);
|
|
}
|
|
|
|
static void ping_format_sock(struct sock *sp, struct seq_file *f,
|
|
int bucket, int *len)
|
|
{
|
|
struct inet_sock *inet = inet_sk(sp);
|
|
__be32 dest = inet->inet_daddr;
|
|
__be32 src = inet->inet_rcv_saddr;
|
|
__u16 destp = ntohs(inet->inet_dport);
|
|
__u16 srcp = ntohs(inet->inet_sport);
|
|
|
|
seq_printf(f, "%5d: %08X:%04X %08X:%04X"
|
|
" %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %d%n",
|
|
bucket, src, srcp, dest, destp, sp->sk_state,
|
|
sk_wmem_alloc_get(sp),
|
|
sk_rmem_alloc_get(sp),
|
|
0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp),
|
|
atomic_read(&sp->sk_refcnt), sp,
|
|
atomic_read(&sp->sk_drops), len);
|
|
}
|
|
|
|
static int ping_seq_show(struct seq_file *seq, void *v)
|
|
{
|
|
if (v == SEQ_START_TOKEN)
|
|
seq_printf(seq, "%-127s\n",
|
|
" sl local_address rem_address st tx_queue "
|
|
"rx_queue tr tm->when retrnsmt uid timeout "
|
|
"inode ref pointer drops");
|
|
else {
|
|
struct ping_iter_state *state = seq->private;
|
|
int len;
|
|
|
|
ping_format_sock(v, seq, state->bucket, &len);
|
|
seq_printf(seq, "%*s\n", 127 - len, "");
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations ping_seq_ops = {
|
|
.show = ping_seq_show,
|
|
.start = ping_seq_start,
|
|
.next = ping_seq_next,
|
|
.stop = ping_seq_stop,
|
|
};
|
|
|
|
static int ping_seq_open(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_open_net(inode, file, &ping_seq_ops,
|
|
sizeof(struct ping_iter_state));
|
|
}
|
|
|
|
static const struct file_operations ping_seq_fops = {
|
|
.open = ping_seq_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release_net,
|
|
};
|
|
|
|
static int ping_proc_register(struct net *net)
|
|
{
|
|
struct proc_dir_entry *p;
|
|
int rc = 0;
|
|
|
|
p = proc_net_fops_create(net, "icmp", S_IRUGO, &ping_seq_fops);
|
|
if (!p)
|
|
rc = -ENOMEM;
|
|
return rc;
|
|
}
|
|
|
|
static void ping_proc_unregister(struct net *net)
|
|
{
|
|
proc_net_remove(net, "icmp");
|
|
}
|
|
|
|
|
|
static int __net_init ping_proc_init_net(struct net *net)
|
|
{
|
|
return ping_proc_register(net);
|
|
}
|
|
|
|
static void __net_exit ping_proc_exit_net(struct net *net)
|
|
{
|
|
ping_proc_unregister(net);
|
|
}
|
|
|
|
static struct pernet_operations ping_net_ops = {
|
|
.init = ping_proc_init_net,
|
|
.exit = ping_proc_exit_net,
|
|
};
|
|
|
|
int __init ping_proc_init(void)
|
|
{
|
|
return register_pernet_subsys(&ping_net_ops);
|
|
}
|
|
|
|
void ping_proc_exit(void)
|
|
{
|
|
unregister_pernet_subsys(&ping_net_ops);
|
|
}
|
|
|
|
#endif
|
|
|
|
void __init ping_init(void)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < PING_HTABLE_SIZE; i++)
|
|
INIT_HLIST_NULLS_HEAD(&ping_table.hash[i], i);
|
|
rwlock_init(&ping_table.lock);
|
|
}
|