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_reuseport __tw_common.skc_reuseport 47 #define tw_ipv6only __tw_common.skc_ipv6only 48 #define tw_bound_dev_if __tw_common.skc_bound_dev_if 49 #define tw_node __tw_common.skc_nulls_node 50 #define tw_bind_node __tw_common.skc_bind_node 51 #define tw_refcnt __tw_common.skc_refcnt 52 #define tw_hash __tw_common.skc_hash 53 #define tw_prot __tw_common.skc_prot 54 #define tw_net __tw_common.skc_net 55 #define tw_daddr __tw_common.skc_daddr 56 #define tw_v6_daddr __tw_common.skc_v6_daddr 57 #define tw_rcv_saddr __tw_common.skc_rcv_saddr 58 #define tw_v6_rcv_saddr __tw_common.skc_v6_rcv_saddr 59 #define tw_dport __tw_common.skc_dport 60 #define tw_num __tw_common.skc_num 61 #define tw_cookie __tw_common.skc_cookie 62 #define tw_dr __tw_common.skc_tw_dr 63 64 __u32 tw_mark; 65 volatile unsigned char tw_substate; 66 unsigned char tw_rcv_wscale; 67 68 /* Socket demultiplex comparisons on incoming packets. */ 69 /* these three are in inet_sock */ 70 __be16 tw_sport; 71 /* And these are ours. */ 72 unsigned int tw_kill : 1, 73 tw_transparent : 1, 74 tw_flowlabel : 20, 75 tw_pad : 2, /* 2 bits hole */ 76 tw_tos : 8; 77 struct timer_list tw_timer; 78 struct inet_bind_bucket *tw_tb; 79 }; 80 #define tw_tclass tw_tos 81 82 static inline struct inet_timewait_sock *inet_twsk(const struct sock *sk) 83 { 84 return (struct inet_timewait_sock *)sk; 85 } 86 87 void inet_twsk_free(struct inet_timewait_sock *tw); 88 void inet_twsk_put(struct inet_timewait_sock *tw); 89 90 void inet_twsk_bind_unhash(struct inet_timewait_sock *tw, 91 struct inet_hashinfo *hashinfo); 92 93 struct inet_timewait_sock *inet_twsk_alloc(const struct sock *sk, 94 struct inet_timewait_death_row *dr, 95 const int state); 96 97 void inet_twsk_hashdance(struct inet_timewait_sock *tw, struct sock *sk, 98 struct inet_hashinfo *hashinfo); 99 100 void __inet_twsk_schedule(struct inet_timewait_sock *tw, int timeo, 101 bool rearm); 102 103 static inline void inet_twsk_schedule(struct inet_timewait_sock *tw, int timeo) 104 { 105 __inet_twsk_schedule(tw, timeo, false); 106 } 107 108 static inline void inet_twsk_reschedule(struct inet_timewait_sock *tw, int timeo) 109 { 110 __inet_twsk_schedule(tw, timeo, true); 111 } 112 113 void inet_twsk_deschedule_put(struct inet_timewait_sock *tw); 114 115 void inet_twsk_purge(struct inet_hashinfo *hashinfo, int family); 116 117 static inline 118 struct net *twsk_net(const struct inet_timewait_sock *twsk) 119 { 120 return read_pnet(&twsk->tw_net); 121 } 122 123 static inline 124 void twsk_net_set(struct inet_timewait_sock *twsk, struct net *net) 125 { 126 write_pnet(&twsk->tw_net, net); 127 } 128 #endif /* _INET_TIMEWAIT_SOCK_ */ 129