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 #include <linux/list.h> 19 #include <linux/timer.h> 20 #include <linux/types.h> 21 #include <linux/workqueue.h> 22 23 #include <net/inet_sock.h> 24 #include <net/sock.h> 25 #include <net/tcp_states.h> 26 #include <net/timewait_sock.h> 27 28 #include <linux/atomic.h> 29 30 struct inet_bind_bucket; 31 32 /* 33 * This is a TIME_WAIT sock. It works around the memory consumption 34 * problems of sockets in such a state on heavily loaded servers, but 35 * without violating the protocol specification. 36 */ 37 struct inet_timewait_sock { 38 /* 39 * Now struct sock also uses sock_common, so please just 40 * don't add nothing before this first member (__tw_common) --acme 41 */ 42 struct sock_common __tw_common; 43 #define tw_family __tw_common.skc_family 44 #define tw_state __tw_common.skc_state 45 #define tw_reuse __tw_common.skc_reuse 46 #define tw_ipv6only __tw_common.skc_ipv6only 47 #define tw_bound_dev_if __tw_common.skc_bound_dev_if 48 #define tw_node __tw_common.skc_nulls_node 49 #define tw_bind_node __tw_common.skc_bind_node 50 #define tw_refcnt __tw_common.skc_refcnt 51 #define tw_hash __tw_common.skc_hash 52 #define tw_prot __tw_common.skc_prot 53 #define tw_net __tw_common.skc_net 54 #define tw_daddr __tw_common.skc_daddr 55 #define tw_v6_daddr __tw_common.skc_v6_daddr 56 #define tw_rcv_saddr __tw_common.skc_rcv_saddr 57 #define tw_v6_rcv_saddr __tw_common.skc_v6_rcv_saddr 58 #define tw_dport __tw_common.skc_dport 59 #define tw_num __tw_common.skc_num 60 #define tw_cookie __tw_common.skc_cookie 61 #define tw_dr __tw_common.skc_tw_dr 62 63 int tw_timeout; 64 volatile unsigned char tw_substate; 65 unsigned char tw_rcv_wscale; 66 67 /* Socket demultiplex comparisons on incoming packets. */ 68 /* these three are in inet_sock */ 69 __be16 tw_sport; 70 /* And these are ours. */ 71 unsigned int tw_kill : 1, 72 tw_transparent : 1, 73 tw_flowlabel : 20, 74 tw_pad : 2, /* 2 bits hole */ 75 tw_tos : 8; 76 struct timer_list tw_timer; 77 struct inet_bind_bucket *tw_tb; 78 }; 79 #define tw_tclass tw_tos 80 81 static inline struct inet_timewait_sock *inet_twsk(const struct sock *sk) 82 { 83 return (struct inet_timewait_sock *)sk; 84 } 85 86 void inet_twsk_free(struct inet_timewait_sock *tw); 87 void inet_twsk_put(struct inet_timewait_sock *tw); 88 89 void inet_twsk_bind_unhash(struct inet_timewait_sock *tw, 90 struct inet_hashinfo *hashinfo); 91 92 struct inet_timewait_sock *inet_twsk_alloc(const struct sock *sk, 93 struct inet_timewait_death_row *dr, 94 const int state); 95 96 void inet_twsk_hashdance(struct inet_timewait_sock *tw, struct sock *sk, 97 struct inet_hashinfo *hashinfo); 98 99 void __inet_twsk_schedule(struct inet_timewait_sock *tw, int timeo, 100 bool rearm); 101 102 static inline void inet_twsk_schedule(struct inet_timewait_sock *tw, int timeo) 103 { 104 __inet_twsk_schedule(tw, timeo, false); 105 } 106 107 static inline void inet_twsk_reschedule(struct inet_timewait_sock *tw, int timeo) 108 { 109 __inet_twsk_schedule(tw, timeo, true); 110 } 111 112 void inet_twsk_deschedule_put(struct inet_timewait_sock *tw); 113 114 void inet_twsk_purge(struct inet_hashinfo *hashinfo, int family); 115 116 static inline 117 struct net *twsk_net(const struct inet_timewait_sock *twsk) 118 { 119 return read_pnet(&twsk->tw_net); 120 } 121 122 static inline 123 void twsk_net_set(struct inet_timewait_sock *twsk, struct net *net) 124 { 125 write_pnet(&twsk->tw_net, net); 126 } 127 #endif /* _INET_TIMEWAIT_SOCK_ */ 128