1 /* 2 * INET An implementation of the TCP/IP protocol suite for the LINUX 3 * operating system. INET is implemented using the BSD Socket 4 * interface as the means of communication with the user level. 5 * 6 * Definitions for a generic INET TIMEWAIT sock 7 * 8 * From code originally in net/tcp.h 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License 12 * as published by the Free Software Foundation; either version 13 * 2 of the License, or (at your option) any later version. 14 */ 15 #ifndef _INET_TIMEWAIT_SOCK_ 16 #define _INET_TIMEWAIT_SOCK_ 17 18 19 #include <linux/kmemcheck.h> 20 #include <linux/list.h> 21 #include <linux/timer.h> 22 #include <linux/types.h> 23 #include <linux/workqueue.h> 24 25 #include <net/inet_sock.h> 26 #include <net/sock.h> 27 #include <net/tcp_states.h> 28 #include <net/timewait_sock.h> 29 30 #include <linux/atomic.h> 31 32 struct inet_bind_bucket; 33 34 /* 35 * This is a TIME_WAIT sock. It works around the memory consumption 36 * problems of sockets in such a state on heavily loaded servers, but 37 * without violating the protocol specification. 38 */ 39 struct inet_timewait_sock { 40 /* 41 * Now struct sock also uses sock_common, so please just 42 * don't add nothing before this first member (__tw_common) --acme 43 */ 44 struct sock_common __tw_common; 45 #define tw_family __tw_common.skc_family 46 #define tw_state __tw_common.skc_state 47 #define tw_reuse __tw_common.skc_reuse 48 #define tw_ipv6only __tw_common.skc_ipv6only 49 #define tw_bound_dev_if __tw_common.skc_bound_dev_if 50 #define tw_node __tw_common.skc_nulls_node 51 #define tw_bind_node __tw_common.skc_bind_node 52 #define tw_refcnt __tw_common.skc_refcnt 53 #define tw_hash __tw_common.skc_hash 54 #define tw_prot __tw_common.skc_prot 55 #define tw_net __tw_common.skc_net 56 #define tw_daddr __tw_common.skc_daddr 57 #define tw_v6_daddr __tw_common.skc_v6_daddr 58 #define tw_rcv_saddr __tw_common.skc_rcv_saddr 59 #define tw_v6_rcv_saddr __tw_common.skc_v6_rcv_saddr 60 #define tw_dport __tw_common.skc_dport 61 #define tw_num __tw_common.skc_num 62 #define tw_cookie __tw_common.skc_cookie 63 #define tw_dr __tw_common.skc_tw_dr 64 65 int tw_timeout; 66 volatile unsigned char tw_substate; 67 unsigned char tw_rcv_wscale; 68 69 /* Socket demultiplex comparisons on incoming packets. */ 70 /* these three are in inet_sock */ 71 __be16 tw_sport; 72 kmemcheck_bitfield_begin(flags); 73 /* And these are ours. */ 74 unsigned int tw_kill : 1, 75 tw_transparent : 1, 76 tw_flowlabel : 20, 77 tw_pad : 2, /* 2 bits hole */ 78 tw_tos : 8; 79 kmemcheck_bitfield_end(flags); 80 struct timer_list tw_timer; 81 struct inet_bind_bucket *tw_tb; 82 }; 83 #define tw_tclass tw_tos 84 85 static inline struct inet_timewait_sock *inet_twsk(const struct sock *sk) 86 { 87 return (struct inet_timewait_sock *)sk; 88 } 89 90 void inet_twsk_free(struct inet_timewait_sock *tw); 91 void inet_twsk_put(struct inet_timewait_sock *tw); 92 93 void inet_twsk_bind_unhash(struct inet_timewait_sock *tw, 94 struct inet_hashinfo *hashinfo); 95 96 struct inet_timewait_sock *inet_twsk_alloc(const struct sock *sk, 97 struct inet_timewait_death_row *dr, 98 const int state); 99 100 void __inet_twsk_hashdance(struct inet_timewait_sock *tw, struct sock *sk, 101 struct inet_hashinfo *hashinfo); 102 103 void __inet_twsk_schedule(struct inet_timewait_sock *tw, int timeo, 104 bool rearm); 105 106 static inline void inet_twsk_schedule(struct inet_timewait_sock *tw, int timeo) 107 { 108 __inet_twsk_schedule(tw, timeo, false); 109 } 110 111 static inline void inet_twsk_reschedule(struct inet_timewait_sock *tw, int timeo) 112 { 113 __inet_twsk_schedule(tw, timeo, true); 114 } 115 116 void inet_twsk_deschedule_put(struct inet_timewait_sock *tw); 117 118 void inet_twsk_purge(struct inet_hashinfo *hashinfo, int family); 119 120 static inline 121 struct net *twsk_net(const struct inet_timewait_sock *twsk) 122 { 123 return read_pnet(&twsk->tw_net); 124 } 125 126 static inline 127 void twsk_net_set(struct inet_timewait_sock *twsk, struct net *net) 128 { 129 write_pnet(&twsk->tw_net, net); 130 } 131 #endif /* _INET_TIMEWAIT_SOCK_ */ 132