1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * INET An implementation of the TCP/IP protocol suite for the LINUX 4 * operating system. INET is implemented using the BSD Socket 5 * interface as the means of communication with the user level. 6 * 7 * Definitions for a generic INET TIMEWAIT sock 8 * 9 * From code originally in net/tcp.h 10 */ 11 #ifndef _INET_TIMEWAIT_SOCK_ 12 #define _INET_TIMEWAIT_SOCK_ 13 14 #include <linux/list.h> 15 #include <linux/timer.h> 16 #include <linux/types.h> 17 #include <linux/workqueue.h> 18 19 #include <net/inet_sock.h> 20 #include <net/sock.h> 21 #include <net/tcp_states.h> 22 #include <net/timewait_sock.h> 23 24 #include <linux/atomic.h> 25 26 struct inet_bind_bucket; 27 28 /* 29 * This is a TIME_WAIT sock. It works around the memory consumption 30 * problems of sockets in such a state on heavily loaded servers, but 31 * without violating the protocol specification. 32 */ 33 struct inet_timewait_sock { 34 /* 35 * Now struct sock also uses sock_common, so please just 36 * don't add nothing before this first member (__tw_common) --acme 37 */ 38 struct sock_common __tw_common; 39 #define tw_family __tw_common.skc_family 40 #define tw_state __tw_common.skc_state 41 #define tw_reuse __tw_common.skc_reuse 42 #define tw_reuseport __tw_common.skc_reuseport 43 #define tw_ipv6only __tw_common.skc_ipv6only 44 #define tw_bound_dev_if __tw_common.skc_bound_dev_if 45 #define tw_node __tw_common.skc_nulls_node 46 #define tw_bind_node __tw_common.skc_bind_node 47 #define tw_refcnt __tw_common.skc_refcnt 48 #define tw_hash __tw_common.skc_hash 49 #define tw_prot __tw_common.skc_prot 50 #define tw_net __tw_common.skc_net 51 #define tw_daddr __tw_common.skc_daddr 52 #define tw_v6_daddr __tw_common.skc_v6_daddr 53 #define tw_rcv_saddr __tw_common.skc_rcv_saddr 54 #define tw_v6_rcv_saddr __tw_common.skc_v6_rcv_saddr 55 #define tw_dport __tw_common.skc_dport 56 #define tw_num __tw_common.skc_num 57 #define tw_cookie __tw_common.skc_cookie 58 #define tw_dr __tw_common.skc_tw_dr 59 60 __u32 tw_mark; 61 volatile unsigned char tw_substate; 62 unsigned char tw_rcv_wscale; 63 64 /* Socket demultiplex comparisons on incoming packets. */ 65 /* these three are in inet_sock */ 66 __be16 tw_sport; 67 /* And these are ours. */ 68 unsigned int tw_transparent : 1, 69 tw_flowlabel : 20, 70 tw_pad : 3, /* 3 bits hole */ 71 tw_tos : 8; 72 u32 tw_txhash; 73 u32 tw_priority; 74 struct timer_list tw_timer; 75 struct inet_bind_bucket *tw_tb; 76 }; 77 #define tw_tclass tw_tos 78 79 static inline struct inet_timewait_sock *inet_twsk(const struct sock *sk) 80 { 81 return (struct inet_timewait_sock *)sk; 82 } 83 84 void inet_twsk_free(struct inet_timewait_sock *tw); 85 void inet_twsk_put(struct inet_timewait_sock *tw); 86 87 void inet_twsk_bind_unhash(struct inet_timewait_sock *tw, 88 struct inet_hashinfo *hashinfo); 89 90 struct inet_timewait_sock *inet_twsk_alloc(const struct sock *sk, 91 struct inet_timewait_death_row *dr, 92 const int state); 93 94 void inet_twsk_hashdance(struct inet_timewait_sock *tw, struct sock *sk, 95 struct inet_hashinfo *hashinfo); 96 97 void __inet_twsk_schedule(struct inet_timewait_sock *tw, int timeo, 98 bool rearm); 99 100 static inline void inet_twsk_schedule(struct inet_timewait_sock *tw, int timeo) 101 { 102 __inet_twsk_schedule(tw, timeo, false); 103 } 104 105 static inline void inet_twsk_reschedule(struct inet_timewait_sock *tw, int timeo) 106 { 107 __inet_twsk_schedule(tw, timeo, true); 108 } 109 110 void inet_twsk_deschedule_put(struct inet_timewait_sock *tw); 111 112 void inet_twsk_purge(struct inet_hashinfo *hashinfo, int family); 113 114 static inline 115 struct net *twsk_net(const struct inet_timewait_sock *twsk) 116 { 117 return read_pnet(&twsk->tw_net); 118 } 119 120 static inline 121 void twsk_net_set(struct inet_timewait_sock *twsk, struct net *net) 122 { 123 write_pnet(&twsk->tw_net, net); 124 } 125 #endif /* _INET_TIMEWAIT_SOCK_ */ 126