diff options
Diffstat (limited to 'include/net/inet_timewait_sock.h')
| -rw-r--r-- | include/net/inet_timewait_sock.h | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/include/net/inet_timewait_sock.h b/include/net/inet_timewait_sock.h new file mode 100644 index 000000000..360c48022 --- /dev/null +++ b/include/net/inet_timewait_sock.h @@ -0,0 +1,132 @@ +/* + * 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 + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ +#ifndef _INET_TIMEWAIT_SOCK_ +#define _INET_TIMEWAIT_SOCK_ + + +#include <linux/kmemcheck.h> +#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_hashinfo; + +struct inet_timewait_death_row { + atomic_t tw_count; + + struct inet_hashinfo *hashinfo ____cacheline_aligned_in_smp; + int sysctl_tw_recycle; + int sysctl_max_tw_buckets; +}; + +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_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 + + int tw_timeout; + 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; + kmemcheck_bitfield_begin(flags); + /* And these are ours. */ + unsigned int tw_kill : 1, + tw_transparent : 1, + tw_flowlabel : 20, + tw_pad : 2, /* 2 bits hole */ + tw_tos : 8; + kmemcheck_bitfield_end(flags); + struct timer_list tw_timer; + struct inet_bind_bucket *tw_tb; + struct inet_timewait_death_row *tw_dr; +}; +#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); + +int inet_twsk_unhash(struct inet_timewait_sock *tw); + +int 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(struct inet_timewait_sock *tw, struct sock *sk, + struct inet_hashinfo *hashinfo); + +void inet_twsk_schedule(struct inet_timewait_sock *tw, const int timeo); +void inet_twsk_deschedule(struct inet_timewait_sock *tw); + +void inet_twsk_purge(struct inet_hashinfo *hashinfo, + struct inet_timewait_death_row *twdr, int family); + +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_ */ |