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_hashinfo; 33 34 struct inet_timewait_death_row { 35 atomic_t tw_count; 36 37 struct inet_hashinfo *hashinfo ____cacheline_aligned_in_smp; 38 int sysctl_tw_recycle; 39 int sysctl_max_tw_buckets; 40 }; 41 42 struct inet_bind_bucket; 43 44 /* 45 * This is a TIME_WAIT sock. It works around the memory consumption 46 * problems of sockets in such a state on heavily loaded servers, but 47 * without violating the protocol specification. 48 */ 49 struct inet_timewait_sock { 50 /* 51 * Now struct sock also uses sock_common, so please just 52 * don't add nothing before this first member (__tw_common) --acme 53 */ 54 struct sock_common __tw_common; 55 #define tw_family __tw_common.skc_family 56 #define tw_state __tw_common.skc_state 57 #define tw_reuse __tw_common.skc_reuse 58 #define tw_ipv6only __tw_common.skc_ipv6only 59 #define tw_bound_dev_if __tw_common.skc_bound_dev_if 60 #define tw_node __tw_common.skc_nulls_node 61 #define tw_bind_node __tw_common.skc_bind_node 62 #define tw_refcnt __tw_common.skc_refcnt 63 #define tw_hash __tw_common.skc_hash 64 #define tw_prot __tw_common.skc_prot 65 #define tw_net __tw_common.skc_net 66 #define tw_daddr __tw_common.skc_daddr 67 #define tw_v6_daddr __tw_common.skc_v6_daddr 68 #define tw_rcv_saddr __tw_common.skc_rcv_saddr 69 #define tw_v6_rcv_saddr __tw_common.skc_v6_rcv_saddr 70 #define tw_dport __tw_common.skc_dport 71 #define tw_num __tw_common.skc_num 72 #define tw_cookie __tw_common.skc_cookie 73 #define tw_dr __tw_common.skc_tw_dr 74 75 int tw_timeout; 76 volatile unsigned char tw_substate; 77 unsigned char tw_rcv_wscale; 78 79 /* Socket demultiplex comparisons on incoming packets. */ 80 /* these three are in inet_sock */ 81 __be16 tw_sport; 82 kmemcheck_bitfield_begin(flags); 83 /* And these are ours. */ 84 unsigned int tw_kill : 1, 85 tw_transparent : 1, 86 tw_flowlabel : 20, 87 tw_pad : 2, /* 2 bits hole */ 88 tw_tos : 8; 89 kmemcheck_bitfield_end(flags); 90 struct timer_list tw_timer; 91 struct inet_bind_bucket *tw_tb; 92 }; 93 #define tw_tclass tw_tos 94 95 static inline struct inet_timewait_sock *inet_twsk(const struct sock *sk) 96 { 97 return (struct inet_timewait_sock *)sk; 98 } 99 100 void inet_twsk_free(struct inet_timewait_sock *tw); 101 void inet_twsk_put(struct inet_timewait_sock *tw); 102 103 void inet_twsk_bind_unhash(struct inet_timewait_sock *tw, 104 struct inet_hashinfo *hashinfo); 105 106 struct inet_timewait_sock *inet_twsk_alloc(const struct sock *sk, 107 struct inet_timewait_death_row *dr, 108 const int state); 109 110 void __inet_twsk_hashdance(struct inet_timewait_sock *tw, struct sock *sk, 111 struct inet_hashinfo *hashinfo); 112 113 void __inet_twsk_schedule(struct inet_timewait_sock *tw, int timeo, 114 bool rearm); 115 116 static inline void inet_twsk_schedule(struct inet_timewait_sock *tw, int timeo) 117 { 118 __inet_twsk_schedule(tw, timeo, false); 119 } 120 121 static inline void inet_twsk_reschedule(struct inet_timewait_sock *tw, int timeo) 122 { 123 __inet_twsk_schedule(tw, timeo, true); 124 } 125 126 void inet_twsk_deschedule_put(struct inet_timewait_sock *tw); 127 128 void inet_twsk_purge(struct inet_hashinfo *hashinfo, 129 struct inet_timewait_death_row *twdr, int family); 130 131 static inline 132 struct net *twsk_net(const struct inet_timewait_sock *twsk) 133 { 134 return read_pnet(&twsk->tw_net); 135 } 136 137 static inline 138 void twsk_net_set(struct inet_timewait_sock *twsk, struct net *net) 139 { 140 write_pnet(&twsk->tw_net, net); 141 } 142 #endif /* _INET_TIMEWAIT_SOCK_ */ 143