6687e988d9
This changeset basically moves tcp_sk()->{ca_ops,ca_state,etc} to inet_csk(),
minimal renaming/moving done in this changeset to ease review.
Most of it is just changes of struct tcp_sock * to struct sock * parameters.
With this we move to a state closer to two interesting goals:
1. Generalisation of net/ipv4/tcp_diag.c, becoming inet_diag.c, being used
for any INET transport protocol that has struct inet_hashinfo and are
derived from struct inet_connection_sock. Keeps the userspace API, that will
just not display DCCP sockets, while newer versions of tools can support
DCCP.
2. INET generic transport pluggable Congestion Avoidance infrastructure, using
the current TCP CA infrastructure with DCCP.
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
267 lines
8 KiB
C
267 lines
8 KiB
C
/*
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* NET Generic infrastructure for INET connection oriented protocols.
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*
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* Definitions for inet_connection_sock
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*
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* Authors: Many people, see the TCP sources
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*
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* From code originally in TCP
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _INET_CONNECTION_SOCK_H
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#define _INET_CONNECTION_SOCK_H
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#include <linux/ip.h>
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#include <linux/string.h>
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#include <linux/timer.h>
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#include <net/request_sock.h>
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#define INET_CSK_DEBUG 1
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/* Cancel timers, when they are not required. */
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#undef INET_CSK_CLEAR_TIMERS
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struct inet_bind_bucket;
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struct inet_hashinfo;
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struct tcp_congestion_ops;
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/** inet_connection_sock - INET connection oriented sock
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*
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* @icsk_accept_queue: FIFO of established children
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* @icsk_bind_hash: Bind node
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* @icsk_timeout: Timeout
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* @icsk_retransmit_timer: Resend (no ack)
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* @icsk_rto: Retransmit timeout
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* @icsk_ca_ops Pluggable congestion control hook
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* @icsk_ca_state: Congestion control state
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* @icsk_retransmits: Number of unrecovered [RTO] timeouts
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* @icsk_pending: Scheduled timer event
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* @icsk_backoff: Backoff
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* @icsk_syn_retries: Number of allowed SYN (or equivalent) retries
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* @icsk_probes_out: unanswered 0 window probes
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* @icsk_ack: Delayed ACK control data
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*/
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struct inet_connection_sock {
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/* inet_sock has to be the first member! */
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struct inet_sock icsk_inet;
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struct request_sock_queue icsk_accept_queue;
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struct inet_bind_bucket *icsk_bind_hash;
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unsigned long icsk_timeout;
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struct timer_list icsk_retransmit_timer;
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struct timer_list icsk_delack_timer;
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__u32 icsk_rto;
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struct tcp_congestion_ops *icsk_ca_ops;
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__u8 icsk_ca_state;
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__u8 icsk_retransmits;
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__u8 icsk_pending;
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__u8 icsk_backoff;
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__u8 icsk_syn_retries;
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__u8 icsk_probes_out;
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/* 2 BYTES HOLE, TRY TO PACK! */
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struct {
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__u8 pending; /* ACK is pending */
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__u8 quick; /* Scheduled number of quick acks */
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__u8 pingpong; /* The session is interactive */
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__u8 blocked; /* Delayed ACK was blocked by socket lock */
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__u32 ato; /* Predicted tick of soft clock */
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unsigned long timeout; /* Currently scheduled timeout */
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__u32 lrcvtime; /* timestamp of last received data packet */
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__u16 last_seg_size; /* Size of last incoming segment */
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__u16 rcv_mss; /* MSS used for delayed ACK decisions */
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} icsk_ack;
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u32 icsk_ca_priv[16];
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#define ICSK_CA_PRIV_SIZE (16 * sizeof(u32))
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};
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#define ICSK_TIME_RETRANS 1 /* Retransmit timer */
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#define ICSK_TIME_DACK 2 /* Delayed ack timer */
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#define ICSK_TIME_PROBE0 3 /* Zero window probe timer */
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#define ICSK_TIME_KEEPOPEN 4 /* Keepalive timer */
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static inline struct inet_connection_sock *inet_csk(const struct sock *sk)
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{
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return (struct inet_connection_sock *)sk;
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}
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static inline void *inet_csk_ca(const struct sock *sk)
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{
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return (void *)inet_csk(sk)->icsk_ca_priv;
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}
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extern struct sock *inet_csk_clone(struct sock *sk,
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const struct request_sock *req,
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const unsigned int __nocast priority);
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enum inet_csk_ack_state_t {
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ICSK_ACK_SCHED = 1,
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ICSK_ACK_TIMER = 2,
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ICSK_ACK_PUSHED = 4
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};
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extern void inet_csk_init_xmit_timers(struct sock *sk,
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void (*retransmit_handler)(unsigned long),
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void (*delack_handler)(unsigned long),
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void (*keepalive_handler)(unsigned long));
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extern void inet_csk_clear_xmit_timers(struct sock *sk);
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static inline void inet_csk_schedule_ack(struct sock *sk)
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{
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inet_csk(sk)->icsk_ack.pending |= ICSK_ACK_SCHED;
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}
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static inline int inet_csk_ack_scheduled(const struct sock *sk)
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{
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return inet_csk(sk)->icsk_ack.pending & ICSK_ACK_SCHED;
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}
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static inline void inet_csk_delack_init(struct sock *sk)
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{
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memset(&inet_csk(sk)->icsk_ack, 0, sizeof(inet_csk(sk)->icsk_ack));
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}
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extern void inet_csk_delete_keepalive_timer(struct sock *sk);
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extern void inet_csk_reset_keepalive_timer(struct sock *sk, unsigned long timeout);
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#ifdef INET_CSK_DEBUG
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extern const char inet_csk_timer_bug_msg[];
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#endif
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static inline void inet_csk_clear_xmit_timer(struct sock *sk, const int what)
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{
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struct inet_connection_sock *icsk = inet_csk(sk);
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if (what == ICSK_TIME_RETRANS || what == ICSK_TIME_PROBE0) {
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icsk->icsk_pending = 0;
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#ifdef INET_CSK_CLEAR_TIMERS
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sk_stop_timer(sk, &icsk->icsk_retransmit_timer);
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#endif
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} else if (what == ICSK_TIME_DACK) {
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icsk->icsk_ack.blocked = icsk->icsk_ack.pending = 0;
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#ifdef INET_CSK_CLEAR_TIMERS
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sk_stop_timer(sk, &icsk->icsk_delack_timer);
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#endif
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}
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#ifdef INET_CSK_DEBUG
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else {
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pr_debug(inet_csk_timer_bug_msg);
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}
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#endif
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}
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/*
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* Reset the retransmission timer
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*/
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static inline void inet_csk_reset_xmit_timer(struct sock *sk, const int what,
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unsigned long when,
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const unsigned long max_when)
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{
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struct inet_connection_sock *icsk = inet_csk(sk);
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if (when > max_when) {
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#ifdef INET_CSK_DEBUG
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pr_debug("reset_xmit_timer: sk=%p %d when=0x%lx, caller=%p\n",
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sk, what, when, current_text_addr());
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#endif
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when = max_when;
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}
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if (what == ICSK_TIME_RETRANS || what == ICSK_TIME_PROBE0) {
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icsk->icsk_pending = what;
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icsk->icsk_timeout = jiffies + when;
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sk_reset_timer(sk, &icsk->icsk_retransmit_timer, icsk->icsk_timeout);
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} else if (what == ICSK_TIME_DACK) {
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icsk->icsk_ack.pending |= ICSK_ACK_TIMER;
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icsk->icsk_ack.timeout = jiffies + when;
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sk_reset_timer(sk, &icsk->icsk_delack_timer, icsk->icsk_ack.timeout);
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}
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#ifdef INET_CSK_DEBUG
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else {
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pr_debug(inet_csk_timer_bug_msg);
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}
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#endif
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}
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extern struct sock *inet_csk_accept(struct sock *sk, int flags, int *err);
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extern struct request_sock *inet_csk_search_req(const struct sock *sk,
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struct request_sock ***prevp,
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const __u16 rport,
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const __u32 raddr,
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const __u32 laddr);
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extern int inet_csk_get_port(struct inet_hashinfo *hashinfo,
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struct sock *sk, unsigned short snum);
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extern struct dst_entry* inet_csk_route_req(struct sock *sk,
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const struct request_sock *req);
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static inline void inet_csk_reqsk_queue_add(struct sock *sk,
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struct request_sock *req,
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struct sock *child)
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{
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reqsk_queue_add(&inet_csk(sk)->icsk_accept_queue, req, sk, child);
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}
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extern void inet_csk_reqsk_queue_hash_add(struct sock *sk,
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struct request_sock *req,
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const unsigned timeout);
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static inline void inet_csk_reqsk_queue_removed(struct sock *sk,
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struct request_sock *req)
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{
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if (reqsk_queue_removed(&inet_csk(sk)->icsk_accept_queue, req) == 0)
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inet_csk_delete_keepalive_timer(sk);
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}
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static inline void inet_csk_reqsk_queue_added(struct sock *sk,
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const unsigned long timeout)
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{
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if (reqsk_queue_added(&inet_csk(sk)->icsk_accept_queue) == 0)
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inet_csk_reset_keepalive_timer(sk, timeout);
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}
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static inline int inet_csk_reqsk_queue_len(const struct sock *sk)
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{
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return reqsk_queue_len(&inet_csk(sk)->icsk_accept_queue);
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}
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static inline int inet_csk_reqsk_queue_young(const struct sock *sk)
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{
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return reqsk_queue_len_young(&inet_csk(sk)->icsk_accept_queue);
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}
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static inline int inet_csk_reqsk_queue_is_full(const struct sock *sk)
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{
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return reqsk_queue_is_full(&inet_csk(sk)->icsk_accept_queue);
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}
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static inline void inet_csk_reqsk_queue_unlink(struct sock *sk,
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struct request_sock *req,
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struct request_sock **prev)
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{
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reqsk_queue_unlink(&inet_csk(sk)->icsk_accept_queue, req, prev);
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}
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static inline void inet_csk_reqsk_queue_drop(struct sock *sk,
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struct request_sock *req,
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struct request_sock **prev)
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{
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inet_csk_reqsk_queue_unlink(sk, req, prev);
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inet_csk_reqsk_queue_removed(sk, req);
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reqsk_free(req);
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}
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extern void inet_csk_reqsk_queue_prune(struct sock *parent,
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const unsigned long interval,
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const unsigned long timeout,
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const unsigned long max_rto);
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extern void inet_csk_destroy_sock(struct sock *sk);
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extern int inet_csk_listen_start(struct sock *sk, const int nr_table_entries);
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extern void inet_csk_listen_stop(struct sock *sk);
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#endif /* _INET_CONNECTION_SOCK_H */
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