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1178 lines
28 KiB
1178 lines
28 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
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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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* 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 <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/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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|
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#if IS_ENABLED(CONFIG_IPV6) |
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#include <linux/in6.h> |
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#include <linux/icmpv6.h> |
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#include <net/addrconf.h> |
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#include <net/ipv6.h> |
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#include <net/transp_v6.h> |
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#endif |
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|
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struct ping_table { |
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struct hlist_nulls_head hash[PING_HTABLE_SIZE]; |
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rwlock_t lock; |
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}; |
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|
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static struct ping_table ping_table; |
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struct pingv6_ops pingv6_ops; |
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EXPORT_SYMBOL_GPL(pingv6_ops); |
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|
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static u16 ping_port_rover; |
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|
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static inline u32 ping_hashfn(const struct net *net, u32 num, u32 mask) |
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{ |
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u32 res = (num + net_hash_mix(net)) & mask; |
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|
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pr_debug("hash(%u) = %u\n", num, res); |
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return res; |
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} |
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EXPORT_SYMBOL_GPL(ping_hash); |
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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 int 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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|
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int ping_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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|
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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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|
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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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|
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if (isk2->inet_num == result) |
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goto next_port; |
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} |
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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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|
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/* BUG? Why is this reuse and not reuseaddr? ping.c |
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* doesn't turn off SO_REUSEADDR, and it doesn't expect |
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* that other ping processes can steal its packets. |
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*/ |
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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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|
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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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|
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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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EXPORT_SYMBOL_GPL(ping_get_port); |
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|
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int ping_hash(struct sock *sk) |
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{ |
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pr_debug("ping_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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return 0; |
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} |
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|
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void ping_unhash(struct sock *sk) |
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{ |
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struct inet_sock *isk = inet_sk(sk); |
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|
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pr_debug("ping_unhash(isk=%p,isk->num=%u)\n", isk, isk->inet_num); |
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write_lock_bh(&ping_table.lock); |
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if (sk_hashed(sk)) { |
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hlist_nulls_del(&sk->sk_nulls_node); |
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sk_nulls_node_init(&sk->sk_nulls_node); |
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sock_put(sk); |
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isk->inet_num = 0; |
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isk->inet_sport = 0; |
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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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} |
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EXPORT_SYMBOL_GPL(ping_unhash); |
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|
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static struct sock *ping_lookup(struct net *net, struct sk_buff *skb, u16 ident) |
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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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int dif = skb->dev->ifindex; |
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|
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if (skb->protocol == htons(ETH_P_IP)) { |
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pr_debug("try to find: num = %d, daddr = %pI4, dif = %d\n", |
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(int)ident, &ip_hdr(skb)->daddr, dif); |
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#if IS_ENABLED(CONFIG_IPV6) |
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} else if (skb->protocol == htons(ETH_P_IPV6)) { |
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pr_debug("try to find: num = %d, daddr = %pI6c, dif = %d\n", |
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(int)ident, &ipv6_hdr(skb)->daddr, dif); |
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#endif |
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} |
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|
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read_lock_bh(&ping_table.lock); |
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|
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ping_portaddr_for_each_entry(sk, hnode, hslot) { |
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isk = inet_sk(sk); |
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|
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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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|
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if (skb->protocol == htons(ETH_P_IP) && |
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sk->sk_family == AF_INET) { |
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pr_debug("found: %p: num=%d, daddr=%pI4, dif=%d\n", sk, |
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(int) isk->inet_num, &isk->inet_rcv_saddr, |
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sk->sk_bound_dev_if); |
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|
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if (isk->inet_rcv_saddr && |
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isk->inet_rcv_saddr != ip_hdr(skb)->daddr) |
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continue; |
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#if IS_ENABLED(CONFIG_IPV6) |
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} else if (skb->protocol == htons(ETH_P_IPV6) && |
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sk->sk_family == AF_INET6) { |
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|
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pr_debug("found: %p: num=%d, daddr=%pI6c, dif=%d\n", sk, |
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(int) isk->inet_num, |
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&sk->sk_v6_rcv_saddr, |
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sk->sk_bound_dev_if); |
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|
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if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) && |
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!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, |
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&ipv6_hdr(skb)->daddr)) |
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continue; |
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#endif |
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} else { |
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continue; |
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} |
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|
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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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|
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sock_hold(sk); |
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goto exit; |
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} |
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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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|
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return sk; |
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} |
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|
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static void inet_get_ping_group_range_net(struct net *net, kgid_t *low, |
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kgid_t *high) |
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{ |
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kgid_t *data = net->ipv4.ping_group_range.range; |
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unsigned int seq; |
|
|
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do { |
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seq = read_seqbegin(&net->ipv4.ping_group_range.lock); |
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|
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*low = data[0]; |
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*high = data[1]; |
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} while (read_seqretry(&net->ipv4.ping_group_range.lock, seq)); |
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} |
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|
|
|
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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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kgid_t group = current_egid(); |
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struct group_info *group_info; |
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int i; |
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kgid_t low, high; |
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int ret = 0; |
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|
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if (sk->sk_family == AF_INET6) |
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sk->sk_ipv6only = 1; |
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|
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inet_get_ping_group_range_net(net, &low, &high); |
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if (gid_lte(low, group) && gid_lte(group, high)) |
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return 0; |
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|
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group_info = get_current_groups(); |
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for (i = 0; i < group_info->ngroups; i++) { |
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kgid_t gid = group_info->gid[i]; |
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|
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if (gid_lte(low, gid) && gid_lte(gid, high)) |
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goto out_release_group; |
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} |
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|
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ret = -EACCES; |
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|
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out_release_group: |
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put_group_info(group_info); |
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(ping_init_sock); |
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|
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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", refcount_read(&sk->sk_refcnt)); |
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|
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sk_common_release(sk); |
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} |
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EXPORT_SYMBOL_GPL(ping_close); |
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|
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/* Checks the bind address and possibly modifies sk->sk_bound_dev_if. */ |
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static int ping_check_bind_addr(struct sock *sk, struct inet_sock *isk, |
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struct sockaddr *uaddr, int addr_len) |
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{ |
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struct net *net = sock_net(sk); |
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if (sk->sk_family == AF_INET) { |
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struct sockaddr_in *addr = (struct sockaddr_in *) uaddr; |
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int chk_addr_ret; |
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|
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if (addr_len < sizeof(*addr)) |
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return -EINVAL; |
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|
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if (addr->sin_family != AF_INET && |
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!(addr->sin_family == AF_UNSPEC && |
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addr->sin_addr.s_addr == htonl(INADDR_ANY))) |
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return -EAFNOSUPPORT; |
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|
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pr_debug("ping_check_bind_addr(sk=%p,addr=%pI4,port=%d)\n", |
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sk, &addr->sin_addr.s_addr, ntohs(addr->sin_port)); |
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|
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if (addr->sin_addr.s_addr == htonl(INADDR_ANY)) |
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chk_addr_ret = RTN_LOCAL; |
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else |
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chk_addr_ret = inet_addr_type(net, addr->sin_addr.s_addr); |
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|
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if ((!inet_can_nonlocal_bind(net, isk) && |
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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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|
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#if IS_ENABLED(CONFIG_IPV6) |
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} else if (sk->sk_family == AF_INET6) { |
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struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr; |
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int addr_type, scoped, has_addr; |
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struct net_device *dev = NULL; |
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|
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if (addr_len < sizeof(*addr)) |
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return -EINVAL; |
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|
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if (addr->sin6_family != AF_INET6) |
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return -EAFNOSUPPORT; |
|
|
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pr_debug("ping_check_bind_addr(sk=%p,addr=%pI6c,port=%d)\n", |
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sk, addr->sin6_addr.s6_addr, ntohs(addr->sin6_port)); |
|
|
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addr_type = ipv6_addr_type(&addr->sin6_addr); |
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scoped = __ipv6_addr_needs_scope_id(addr_type); |
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if ((addr_type != IPV6_ADDR_ANY && |
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!(addr_type & IPV6_ADDR_UNICAST)) || |
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(scoped && !addr->sin6_scope_id)) |
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return -EINVAL; |
|
|
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rcu_read_lock(); |
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if (addr->sin6_scope_id) { |
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dev = dev_get_by_index_rcu(net, addr->sin6_scope_id); |
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if (!dev) { |
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rcu_read_unlock(); |
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return -ENODEV; |
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} |
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} |
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has_addr = pingv6_ops.ipv6_chk_addr(net, &addr->sin6_addr, dev, |
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scoped); |
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rcu_read_unlock(); |
|
|
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if (!(ipv6_can_nonlocal_bind(net, isk) || has_addr || |
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addr_type == IPV6_ADDR_ANY)) |
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return -EADDRNOTAVAIL; |
|
|
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if (scoped) |
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sk->sk_bound_dev_if = addr->sin6_scope_id; |
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#endif |
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} else { |
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return -EAFNOSUPPORT; |
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} |
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return 0; |
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} |
|
|
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static void ping_set_saddr(struct sock *sk, struct sockaddr *saddr) |
|
{ |
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if (saddr->sa_family == AF_INET) { |
|
struct inet_sock *isk = inet_sk(sk); |
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struct sockaddr_in *addr = (struct sockaddr_in *) saddr; |
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isk->inet_rcv_saddr = isk->inet_saddr = addr->sin_addr.s_addr; |
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#if IS_ENABLED(CONFIG_IPV6) |
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} else if (saddr->sa_family == AF_INET6) { |
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struct sockaddr_in6 *addr = (struct sockaddr_in6 *) saddr; |
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struct ipv6_pinfo *np = inet6_sk(sk); |
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sk->sk_v6_rcv_saddr = np->saddr = addr->sin6_addr; |
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#endif |
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} |
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} |
|
|
|
/* |
|
* We need our own bind because there are no privileged id's == local ports. |
|
* Moreover, we don't allow binding to multi- and broadcast addresses. |
|
*/ |
|
|
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int ping_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) |
|
{ |
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struct inet_sock *isk = inet_sk(sk); |
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unsigned short snum; |
|
int err; |
|
int dif = sk->sk_bound_dev_if; |
|
|
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err = ping_check_bind_addr(sk, isk, uaddr, addr_len); |
|
if (err) |
|
return err; |
|
|
|
lock_sock(sk); |
|
|
|
err = -EINVAL; |
|
if (isk->inet_num != 0) |
|
goto out; |
|
|
|
err = -EADDRINUSE; |
|
snum = ntohs(((struct sockaddr_in *)uaddr)->sin_port); |
|
if (ping_get_port(sk, snum) != 0) { |
|
/* Restore possibly modified sk->sk_bound_dev_if by ping_check_bind_addr(). */ |
|
sk->sk_bound_dev_if = dif; |
|
goto out; |
|
} |
|
ping_set_saddr(sk, uaddr); |
|
|
|
pr_debug("after bind(): num = %hu, dif = %d\n", |
|
isk->inet_num, |
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sk->sk_bound_dev_if); |
|
|
|
err = 0; |
|
if (sk->sk_family == AF_INET && isk->inet_rcv_saddr) |
|
sk->sk_userlocks |= SOCK_BINDADDR_LOCK; |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
if (sk->sk_family == AF_INET6 && !ipv6_addr_any(&sk->sk_v6_rcv_saddr)) |
|
sk->sk_userlocks |= SOCK_BINDADDR_LOCK; |
|
#endif |
|
|
|
if (snum) |
|
sk->sk_userlocks |= SOCK_BINDPORT_LOCK; |
|
isk->inet_sport = htons(isk->inet_num); |
|
isk->inet_daddr = 0; |
|
isk->inet_dport = 0; |
|
|
|
#if IS_ENABLED(CONFIG_IPV6) |
|
if (sk->sk_family == AF_INET6) |
|
memset(&sk->sk_v6_daddr, 0, sizeof(sk->sk_v6_daddr)); |
|
#endif |
|
|
|
sk_dst_reset(sk); |
|
out: |
|
release_sock(sk); |
|
pr_debug("ping_v4_bind -> %d\n", err); |
|
return err; |
|
} |
|
EXPORT_SYMBOL_GPL(ping_bind); |
|
|
|
/* |
|
* Is this a supported type of ICMP message? |
|
*/ |
|
|
|
static inline int ping_supported(int family, int type, int code) |
|
{ |
|
return (family == AF_INET && type == ICMP_ECHO && code == 0) || |
|
(family == AF_INET && type == ICMP_EXT_ECHO && code == 0) || |
|
(family == AF_INET6 && type == ICMPV6_ECHO_REQUEST && code == 0) || |
|
(family == AF_INET6 && type == ICMPV6_EXT_ECHO_REQUEST && code == 0); |
|
} |
|
|
|
/* |
|
* This routine is called by the ICMP module when it gets some |
|
* sort of error condition. |
|
*/ |
|
|
|
void ping_err(struct sk_buff *skb, int offset, u32 info) |
|
{ |
|
int family; |
|
struct icmphdr *icmph; |
|
struct inet_sock *inet_sock; |
|
int type; |
|
int code; |
|
struct net *net = dev_net(skb->dev); |
|
struct sock *sk; |
|
int harderr; |
|
int err; |
|
|
|
if (skb->protocol == htons(ETH_P_IP)) { |
|
family = AF_INET; |
|
type = icmp_hdr(skb)->type; |
|
code = icmp_hdr(skb)->code; |
|
icmph = (struct icmphdr *)(skb->data + offset); |
|
} else if (skb->protocol == htons(ETH_P_IPV6)) { |
|
family = AF_INET6; |
|
type = icmp6_hdr(skb)->icmp6_type; |
|
code = icmp6_hdr(skb)->icmp6_code; |
|
icmph = (struct icmphdr *) (skb->data + offset); |
|
} else { |
|
BUG(); |
|
} |
|
|
|
/* We assume the packet has already been checked by icmp_unreach */ |
|
|
|
if (!ping_supported(family, icmph->type, icmph->code)) |
|
return; |
|
|
|
pr_debug("ping_err(proto=0x%x,type=%d,code=%d,id=%04x,seq=%04x)\n", |
|
skb->protocol, type, code, ntohs(icmph->un.echo.id), |
|
ntohs(icmph->un.echo.sequence)); |
|
|
|
sk = ping_lookup(net, skb, ntohs(icmph->un.echo.id)); |
|
if (!sk) { |
|
pr_debug("no socket, dropping\n"); |
|
return; /* No socket for error */ |
|
} |
|
pr_debug("err on socket %p\n", sk); |
|
|
|
err = 0; |
|
harderr = 0; |
|
inet_sock = inet_sk(sk); |
|
|
|
if (skb->protocol == htons(ETH_P_IP)) { |
|
switch (type) { |
|
default: |
|
case ICMP_TIME_EXCEEDED: |
|
err = EHOSTUNREACH; |
|
break; |
|
case ICMP_SOURCE_QUENCH: |
|
/* This is not a real error but ping wants to see it. |
|
* Report it with some fake errno. |
|
*/ |
|
err = EREMOTEIO; |
|
break; |
|
case ICMP_PARAMETERPROB: |
|
err = EPROTO; |
|
harderr = 1; |
|
break; |
|
case ICMP_DEST_UNREACH: |
|
if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */ |
|
ipv4_sk_update_pmtu(skb, sk, info); |
|
if (inet_sock->pmtudisc != IP_PMTUDISC_DONT) { |
|
err = EMSGSIZE; |
|
harderr = 1; |
|
break; |
|
} |
|
goto out; |
|
} |
|
err = EHOSTUNREACH; |
|
if (code <= NR_ICMP_UNREACH) { |
|
harderr = icmp_err_convert[code].fatal; |
|
err = icmp_err_convert[code].errno; |
|
} |
|
break; |
|
case ICMP_REDIRECT: |
|
/* See ICMP_SOURCE_QUENCH */ |
|
ipv4_sk_redirect(skb, sk); |
|
err = EREMOTEIO; |
|
break; |
|
} |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
} else if (skb->protocol == htons(ETH_P_IPV6)) { |
|
harderr = pingv6_ops.icmpv6_err_convert(type, code, &err); |
|
#endif |
|
} |
|
|
|
/* |
|
* RFC1122: OK. Passes ICMP errors back to application, as per |
|
* 4.1.3.3. |
|
*/ |
|
if ((family == AF_INET && !inet_sock->recverr) || |
|
(family == AF_INET6 && !inet6_sk(sk)->recverr)) { |
|
if (!harderr || sk->sk_state != TCP_ESTABLISHED) |
|
goto out; |
|
} else { |
|
if (family == AF_INET) { |
|
ip_icmp_error(sk, skb, err, 0 /* no remote port */, |
|
info, (u8 *)icmph); |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
} else if (family == AF_INET6) { |
|
pingv6_ops.ipv6_icmp_error(sk, skb, err, 0, |
|
info, (u8 *)icmph); |
|
#endif |
|
} |
|
} |
|
sk->sk_err = err; |
|
sk_error_report(sk); |
|
out: |
|
sock_put(sk); |
|
} |
|
EXPORT_SYMBOL_GPL(ping_err); |
|
|
|
/* |
|
* Copy and checksum an ICMP Echo packet from user space into a buffer |
|
* starting from the payload. |
|
*/ |
|
|
|
int ping_getfrag(void *from, char *to, |
|
int offset, int fraglen, int odd, struct sk_buff *skb) |
|
{ |
|
struct pingfakehdr *pfh = (struct pingfakehdr *)from; |
|
|
|
if (offset == 0) { |
|
fraglen -= sizeof(struct icmphdr); |
|
if (fraglen < 0) |
|
BUG(); |
|
if (!csum_and_copy_from_iter_full(to + sizeof(struct icmphdr), |
|
fraglen, &pfh->wcheck, |
|
&pfh->msg->msg_iter)) |
|
return -EFAULT; |
|
} else if (offset < sizeof(struct icmphdr)) { |
|
BUG(); |
|
} else { |
|
if (!csum_and_copy_from_iter_full(to, fraglen, &pfh->wcheck, |
|
&pfh->msg->msg_iter)) |
|
return -EFAULT; |
|
} |
|
|
|
#if IS_ENABLED(CONFIG_IPV6) |
|
/* For IPv6, checksum each skb as we go along, as expected by |
|
* icmpv6_push_pending_frames. For IPv4, accumulate the checksum in |
|
* wcheck, it will be finalized in ping_v4_push_pending_frames. |
|
*/ |
|
if (pfh->family == AF_INET6) { |
|
skb->csum = pfh->wcheck; |
|
skb->ip_summed = CHECKSUM_NONE; |
|
pfh->wcheck = 0; |
|
} |
|
#endif |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(ping_getfrag); |
|
|
|
static int ping_v4_push_pending_frames(struct sock *sk, struct pingfakehdr *pfh, |
|
struct flowi4 *fl4) |
|
{ |
|
struct sk_buff *skb = skb_peek(&sk->sk_write_queue); |
|
|
|
if (!skb) |
|
return 0; |
|
pfh->wcheck = csum_partial((char *)&pfh->icmph, |
|
sizeof(struct icmphdr), pfh->wcheck); |
|
pfh->icmph.checksum = csum_fold(pfh->wcheck); |
|
memcpy(icmp_hdr(skb), &pfh->icmph, sizeof(struct icmphdr)); |
|
skb->ip_summed = CHECKSUM_NONE; |
|
return ip_push_pending_frames(sk, fl4); |
|
} |
|
|
|
int ping_common_sendmsg(int family, struct msghdr *msg, size_t len, |
|
void *user_icmph, size_t icmph_len) |
|
{ |
|
u8 type, code; |
|
|
|
if (len > 0xFFFF) |
|
return -EMSGSIZE; |
|
|
|
/* Must have at least a full ICMP header. */ |
|
if (len < icmph_len) |
|
return -EINVAL; |
|
|
|
/* |
|
* Check the flags. |
|
*/ |
|
|
|
/* Mirror BSD error message compatibility */ |
|
if (msg->msg_flags & MSG_OOB) |
|
return -EOPNOTSUPP; |
|
|
|
/* |
|
* Fetch the ICMP header provided by the userland. |
|
* iovec is modified! The ICMP header is consumed. |
|
*/ |
|
if (memcpy_from_msg(user_icmph, msg, icmph_len)) |
|
return -EFAULT; |
|
|
|
if (family == AF_INET) { |
|
type = ((struct icmphdr *) user_icmph)->type; |
|
code = ((struct icmphdr *) user_icmph)->code; |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
} else if (family == AF_INET6) { |
|
type = ((struct icmp6hdr *) user_icmph)->icmp6_type; |
|
code = ((struct icmp6hdr *) user_icmph)->icmp6_code; |
|
#endif |
|
} else { |
|
BUG(); |
|
} |
|
|
|
if (!ping_supported(family, type, code)) |
|
return -EINVAL; |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(ping_common_sendmsg); |
|
|
|
static int ping_v4_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) |
|
{ |
|
struct net *net = sock_net(sk); |
|
struct flowi4 fl4; |
|
struct inet_sock *inet = inet_sk(sk); |
|
struct ipcm_cookie ipc; |
|
struct icmphdr user_icmph; |
|
struct pingfakehdr pfh; |
|
struct rtable *rt = NULL; |
|
struct ip_options_data opt_copy; |
|
int free = 0; |
|
__be32 saddr, daddr, faddr; |
|
u8 tos; |
|
int err; |
|
|
|
pr_debug("ping_v4_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num); |
|
|
|
err = ping_common_sendmsg(AF_INET, msg, len, &user_icmph, |
|
sizeof(user_icmph)); |
|
if (err) |
|
return err; |
|
|
|
/* |
|
* Get and verify the address. |
|
*/ |
|
|
|
if (msg->msg_name) { |
|
DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name); |
|
if (msg->msg_namelen < sizeof(*usin)) |
|
return -EINVAL; |
|
if (usin->sin_family != AF_INET) |
|
return -EAFNOSUPPORT; |
|
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 */ |
|
} |
|
|
|
ipcm_init_sk(&ipc, inet); |
|
|
|
if (msg->msg_controllen) { |
|
err = ip_cmsg_send(sk, msg, &ipc, false); |
|
if (unlikely(err)) { |
|
kfree(ipc.opt); |
|
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) { |
|
err = -EINVAL; |
|
goto out_free; |
|
} |
|
faddr = ipc.opt->opt.faddr; |
|
} |
|
tos = get_rttos(&ipc, inet); |
|
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 || netif_index_is_l3_master(sock_net(sk), ipc.oif)) |
|
ipc.oif = inet->mc_index; |
|
if (!saddr) |
|
saddr = inet->mc_addr; |
|
} else if (!ipc.oif) |
|
ipc.oif = inet->uc_index; |
|
|
|
flowi4_init_output(&fl4, ipc.oif, ipc.sockc.mark, tos, |
|
RT_SCOPE_UNIVERSE, sk->sk_protocol, |
|
inet_sk_flowi_flags(sk), faddr, saddr, 0, 0, |
|
sk->sk_uid); |
|
|
|
fl4.fl4_icmp_type = user_icmph.type; |
|
fl4.fl4_icmp_code = user_icmph.code; |
|
|
|
security_sk_classify_flow(sk, flowi4_to_flowi_common(&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(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.msg = msg; |
|
pfh.wcheck = 0; |
|
pfh.family = AF_INET; |
|
|
|
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_v4_push_pending_frames(sk, &pfh, &fl4); |
|
release_sock(sk); |
|
|
|
out: |
|
ip_rt_put(rt); |
|
out_free: |
|
if (free) |
|
kfree(ipc.opt); |
|
if (!err) { |
|
icmp_out_count(sock_net(sk), user_icmph.type); |
|
return len; |
|
} |
|
return err; |
|
|
|
do_confirm: |
|
if (msg->msg_flags & MSG_PROBE) |
|
dst_confirm_neigh(&rt->dst, &fl4.daddr); |
|
if (!(msg->msg_flags & MSG_PROBE) || len) |
|
goto back_from_confirm; |
|
err = 0; |
|
goto out; |
|
} |
|
|
|
int ping_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int noblock, |
|
int flags, int *addr_len) |
|
{ |
|
struct inet_sock *isk = inet_sk(sk); |
|
int family = sk->sk_family; |
|
struct sk_buff *skb; |
|
int copied, err; |
|
|
|
pr_debug("ping_recvmsg(sk=%p,sk->num=%u)\n", isk, isk->inet_num); |
|
|
|
err = -EOPNOTSUPP; |
|
if (flags & MSG_OOB) |
|
goto out; |
|
|
|
if (flags & MSG_ERRQUEUE) |
|
return inet_recv_error(sk, msg, len, addr_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_msg(skb, 0, msg, copied); |
|
if (err) |
|
goto done; |
|
|
|
sock_recv_timestamp(msg, sk, skb); |
|
|
|
/* Copy the address and add cmsg data. */ |
|
if (family == AF_INET) { |
|
DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); |
|
|
|
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)); |
|
*addr_len = sizeof(*sin); |
|
} |
|
|
|
if (isk->cmsg_flags) |
|
ip_cmsg_recv(msg, skb); |
|
|
|
#if IS_ENABLED(CONFIG_IPV6) |
|
} else if (family == AF_INET6) { |
|
struct ipv6_pinfo *np = inet6_sk(sk); |
|
struct ipv6hdr *ip6 = ipv6_hdr(skb); |
|
DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); |
|
|
|
if (sin6) { |
|
sin6->sin6_family = AF_INET6; |
|
sin6->sin6_port = 0; |
|
sin6->sin6_addr = ip6->saddr; |
|
sin6->sin6_flowinfo = 0; |
|
if (np->sndflow) |
|
sin6->sin6_flowinfo = ip6_flowinfo(ip6); |
|
sin6->sin6_scope_id = |
|
ipv6_iface_scope_id(&sin6->sin6_addr, |
|
inet6_iif(skb)); |
|
*addr_len = sizeof(*sin6); |
|
} |
|
|
|
if (inet6_sk(sk)->rxopt.all) |
|
pingv6_ops.ip6_datagram_recv_common_ctl(sk, msg, skb); |
|
if (skb->protocol == htons(ETH_P_IPV6) && |
|
inet6_sk(sk)->rxopt.all) |
|
pingv6_ops.ip6_datagram_recv_specific_ctl(sk, msg, skb); |
|
else if (skb->protocol == htons(ETH_P_IP) && isk->cmsg_flags) |
|
ip_cmsg_recv(msg, skb); |
|
#endif |
|
} else { |
|
BUG(); |
|
} |
|
|
|
err = copied; |
|
|
|
done: |
|
skb_free_datagram(sk, skb); |
|
out: |
|
pr_debug("ping_recvmsg -> %d\n", err); |
|
return err; |
|
} |
|
EXPORT_SYMBOL_GPL(ping_recvmsg); |
|
|
|
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; |
|
} |
|
EXPORT_SYMBOL_GPL(ping_queue_rcv_skb); |
|
|
|
|
|
/* |
|
* All we need to do is get the socket. |
|
*/ |
|
|
|
bool ping_rcv(struct sk_buff *skb) |
|
{ |
|
struct sock *sk; |
|
struct net *net = dev_net(skb->dev); |
|
struct icmphdr *icmph = icmp_hdr(skb); |
|
bool rc = false; |
|
|
|
/* 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_lookup(net, skb, ntohs(icmph->un.echo.id)); |
|
if (sk) { |
|
struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); |
|
|
|
pr_debug("rcv on socket %p\n", sk); |
|
if (skb2 && !ping_queue_rcv_skb(sk, skb2)) |
|
rc = true; |
|
sock_put(sk); |
|
} |
|
|
|
if (!rc) |
|
pr_debug("no socket, dropping\n"); |
|
|
|
return rc; |
|
} |
|
EXPORT_SYMBOL_GPL(ping_rcv); |
|
|
|
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_v4_sendmsg, |
|
.recvmsg = ping_recvmsg, |
|
.bind = ping_bind, |
|
.backlog_rcv = ping_queue_rcv_skb, |
|
.release_cb = ip4_datagram_release_cb, |
|
.hash = ping_hash, |
|
.unhash = ping_unhash, |
|
.get_port = ping_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) && |
|
sk->sk_family == state->family) |
|
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; |
|
} |
|
|
|
void *ping_seq_start(struct seq_file *seq, loff_t *pos, sa_family_t family) |
|
__acquires(ping_table.lock) |
|
{ |
|
struct ping_iter_state *state = seq->private; |
|
state->bucket = 0; |
|
state->family = family; |
|
|
|
read_lock_bh(&ping_table.lock); |
|
|
|
return *pos ? ping_get_idx(seq, *pos-1) : SEQ_START_TOKEN; |
|
} |
|
EXPORT_SYMBOL_GPL(ping_seq_start); |
|
|
|
static void *ping_v4_seq_start(struct seq_file *seq, loff_t *pos) |
|
{ |
|
return ping_seq_start(seq, pos, AF_INET); |
|
} |
|
|
|
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; |
|
} |
|
EXPORT_SYMBOL_GPL(ping_seq_next); |
|
|
|
void ping_seq_stop(struct seq_file *seq, void *v) |
|
__releases(ping_table.lock) |
|
{ |
|
read_unlock_bh(&ping_table.lock); |
|
} |
|
EXPORT_SYMBOL_GPL(ping_seq_stop); |
|
|
|
static void ping_v4_format_sock(struct sock *sp, struct seq_file *f, |
|
int bucket) |
|
{ |
|
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 %5u %8d %lu %d %pK %u", |
|
bucket, src, srcp, dest, destp, sp->sk_state, |
|
sk_wmem_alloc_get(sp), |
|
sk_rmem_alloc_get(sp), |
|
0, 0L, 0, |
|
from_kuid_munged(seq_user_ns(f), sock_i_uid(sp)), |
|
0, sock_i_ino(sp), |
|
refcount_read(&sp->sk_refcnt), sp, |
|
atomic_read(&sp->sk_drops)); |
|
} |
|
|
|
static int ping_v4_seq_show(struct seq_file *seq, void *v) |
|
{ |
|
seq_setwidth(seq, 127); |
|
if (v == SEQ_START_TOKEN) |
|
seq_puts(seq, " 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; |
|
|
|
ping_v4_format_sock(v, seq, state->bucket); |
|
} |
|
seq_pad(seq, '\n'); |
|
return 0; |
|
} |
|
|
|
static const struct seq_operations ping_v4_seq_ops = { |
|
.start = ping_v4_seq_start, |
|
.show = ping_v4_seq_show, |
|
.next = ping_seq_next, |
|
.stop = ping_seq_stop, |
|
}; |
|
|
|
static int __net_init ping_v4_proc_init_net(struct net *net) |
|
{ |
|
if (!proc_create_net("icmp", 0444, net->proc_net, &ping_v4_seq_ops, |
|
sizeof(struct ping_iter_state))) |
|
return -ENOMEM; |
|
return 0; |
|
} |
|
|
|
static void __net_exit ping_v4_proc_exit_net(struct net *net) |
|
{ |
|
remove_proc_entry("icmp", net->proc_net); |
|
} |
|
|
|
static struct pernet_operations ping_v4_net_ops = { |
|
.init = ping_v4_proc_init_net, |
|
.exit = ping_v4_proc_exit_net, |
|
}; |
|
|
|
int __init ping_proc_init(void) |
|
{ |
|
return register_pernet_subsys(&ping_v4_net_ops); |
|
} |
|
|
|
void ping_proc_exit(void) |
|
{ |
|
unregister_pernet_subsys(&ping_v4_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); |
|
}
|
|
|