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inet_timewait_sock.h
/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * INET An implementation of the TCP/IP protocol suite for the LINUX * operating system. INET is implemented using the BSD Socket * interface as the means of communication with the user level. * * Definitions for a generic INET TIMEWAIT sock * * From code originally in net/tcp.h */ #ifndef _INET_TIMEWAIT_SOCK_ #define _INET_TIMEWAIT_SOCK_ #include <linux/list.h> #include <linux/timer.h> #include <linux/types.h> #include <linux/workqueue.h> #include <net/inet_sock.h> #include <net/sock.h> #include <net/tcp_states.h> #include <net/timewait_sock.h> #include <linux/atomic.h> struct inet_bind_bucket; /* * This is a TIME_WAIT sock. It works around the memory consumption * problems of sockets in such a state on heavily loaded servers, but * without violating the protocol specification. */ struct inet_timewait_sock { /* * Now struct sock also uses sock_common, so please just * don't add nothing before this first member (__tw_common) --acme */ struct sock_common __tw_common; #define tw_family __tw_common.skc_family #define tw_state __tw_common.skc_state #define tw_reuse __tw_common.skc_reuse #define tw_reuseport __tw_common.skc_reuseport #define tw_ipv6only __tw_common.skc_ipv6only #define tw_bound_dev_if __tw_common.skc_bound_dev_if #define tw_node __tw_common.skc_nulls_node #define tw_bind_node __tw_common.skc_bind_node #define tw_refcnt __tw_common.skc_refcnt #define tw_hash __tw_common.skc_hash #define tw_prot __tw_common.skc_prot #define tw_net __tw_common.skc_net #define tw_daddr __tw_common.skc_daddr #define tw_v6_daddr __tw_common.skc_v6_daddr #define tw_rcv_saddr __tw_common.skc_rcv_saddr #define tw_v6_rcv_saddr __tw_common.skc_v6_rcv_saddr #define tw_dport __tw_common.skc_dport #define tw_num __tw_common.skc_num #define tw_cookie __tw_common.skc_cookie #define tw_dr __tw_common.skc_tw_dr __u32 tw_mark; volatile unsigned char tw_substate; unsigned char tw_rcv_wscale; /* Socket demultiplex comparisons on incoming packets. */ /* these three are in inet_sock */ __be16 tw_sport; /* And these are ours. */ unsigned int tw_transparent : 1, tw_flowlabel : 20, tw_usec_ts : 1, tw_pad : 2, /* 2 bits hole */ tw_tos : 8; u32 tw_txhash; u32 tw_priority; struct timer_list tw_timer; struct inet_bind_bucket *tw_tb; struct inet_bind2_bucket *tw_tb2; }; #define tw_tclass tw_tos static inline struct inet_timewait_sock *inet_twsk(const struct sock *sk) { return (struct inet_timewait_sock *)sk; } void inet_twsk_free(struct inet_timewait_sock *tw); void inet_twsk_put(struct inet_timewait_sock *tw); void inet_twsk_bind_unhash(struct inet_timewait_sock *tw, struct inet_hashinfo *hashinfo); struct inet_timewait_sock *inet_twsk_alloc(const struct sock *sk, struct inet_timewait_death_row *dr, const int state); void inet_twsk_hashdance_schedule(struct inet_timewait_sock *tw, struct sock *sk, struct inet_hashinfo *hashinfo, int timeo); void __inet_twsk_schedule(struct inet_timewait_sock *tw, int timeo, bool rearm); static inline void inet_twsk_reschedule(struct inet_timewait_sock *tw, int timeo) { __inet_twsk_schedule(tw, timeo, true); } void inet_twsk_deschedule_put(struct inet_timewait_sock *tw); void inet_twsk_purge(struct inet_hashinfo *hashinfo); static inline struct net *twsk_net(const struct inet_timewait_sock *twsk) { return read_pnet(&twsk->tw_net); } static inline void twsk_net_set(struct inet_timewait_sock *twsk, struct net *net) { write_pnet(&twsk->tw_net, net); } #endif /* _INET_TIMEWAIT_SOCK_ */