/include/net/inet_connection_sock.h
C Header | 348 lines | 256 code | 44 blank | 48 comment | 24 complexity | afe8cbb6756e3bad06d19a31e275252d MD5 | raw file
Possible License(s): GPL-2.0
- /*
- * NET Generic infrastructure for INET connection oriented protocols.
- *
- * Definitions for inet_connection_sock
- *
- * Authors: Many people, see the TCP sources
- *
- * From code originally in TCP
- *
- * 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_CONNECTION_SOCK_H
- #define _INET_CONNECTION_SOCK_H
- #include <linux/compiler.h>
- #include <linux/string.h>
- #include <linux/timer.h>
- #include <linux/poll.h>
- #include <net/inet_sock.h>
- #include <net/request_sock.h>
- #define INET_CSK_DEBUG 1
- /* Cancel timers, when they are not required. */
- #undef INET_CSK_CLEAR_TIMERS
- struct inet_bind_bucket;
- struct tcp_congestion_ops;
- /*
- * Pointers to address related TCP functions
- * (i.e. things that depend on the address family)
- */
- struct inet_connection_sock_af_ops {
- int (*queue_xmit)(struct sk_buff *skb, struct flowi *fl);
- void (*send_check)(struct sock *sk, struct sk_buff *skb);
- int (*rebuild_header)(struct sock *sk);
- void (*sk_rx_dst_set)(struct sock *sk, const struct sk_buff *skb);
- int (*conn_request)(struct sock *sk, struct sk_buff *skb);
- struct sock *(*syn_recv_sock)(struct sock *sk, struct sk_buff *skb,
- struct request_sock *req,
- struct dst_entry *dst);
- u16 net_header_len;
- u16 net_frag_header_len;
- u16 sockaddr_len;
- int (*setsockopt)(struct sock *sk, int level, int optname,
- char __user *optval, unsigned int optlen);
- int (*getsockopt)(struct sock *sk, int level, int optname,
- char __user *optval, int __user *optlen);
- #ifdef CONFIG_COMPAT
- int (*compat_setsockopt)(struct sock *sk,
- int level, int optname,
- char __user *optval, unsigned int optlen);
- int (*compat_getsockopt)(struct sock *sk,
- int level, int optname,
- char __user *optval, int __user *optlen);
- #endif
- void (*addr2sockaddr)(struct sock *sk, struct sockaddr *);
- int (*bind_conflict)(const struct sock *sk,
- const struct inet_bind_bucket *tb, bool relax);
- void (*mtu_reduced)(struct sock *sk);
- };
- /** inet_connection_sock - INET connection oriented sock
- *
- * @icsk_accept_queue: FIFO of established children
- * @icsk_bind_hash: Bind node
- * @icsk_timeout: Timeout
- * @icsk_retransmit_timer: Resend (no ack)
- * @icsk_rto: Retransmit timeout
- * @icsk_pmtu_cookie Last pmtu seen by socket
- * @icsk_ca_ops Pluggable congestion control hook
- * @icsk_af_ops Operations which are AF_INET{4,6} specific
- * @icsk_ca_state: Congestion control state
- * @icsk_retransmits: Number of unrecovered [RTO] timeouts
- * @icsk_pending: Scheduled timer event
- * @icsk_backoff: Backoff
- * @icsk_syn_retries: Number of allowed SYN (or equivalent) retries
- * @icsk_probes_out: unanswered 0 window probes
- * @icsk_ext_hdr_len: Network protocol overhead (IP/IPv6 options)
- * @icsk_ack: Delayed ACK control data
- * @icsk_mtup; MTU probing control data
- */
- struct inet_connection_sock {
- /* inet_sock has to be the first member! */
- struct inet_sock icsk_inet;
- struct request_sock_queue icsk_accept_queue;
- struct inet_bind_bucket *icsk_bind_hash;
- unsigned long icsk_timeout;
- struct timer_list icsk_retransmit_timer;
- struct timer_list icsk_delack_timer;
- __u32 icsk_rto;
- __u32 icsk_MMSRB;
- __u32 icsk_pmtu_cookie;
- const struct tcp_congestion_ops *icsk_ca_ops;
- const struct inet_connection_sock_af_ops *icsk_af_ops;
- unsigned int (*icsk_sync_mss)(struct sock *sk, u32 pmtu);
- __u8 icsk_ca_state;
- __u8 icsk_retransmits;
- __u8 icsk_pending;
- __u8 icsk_backoff;
- __u8 icsk_syn_retries;
- __u8 icsk_probes_out;
- __u16 icsk_ext_hdr_len;
- struct {
- __u8 pending; /* ACK is pending */
- __u8 quick; /* Scheduled number of quick acks */
- __u8 pingpong; /* The session is interactive */
- __u8 blocked; /* Delayed ACK was blocked by socket lock */
- __u32 ato; /* Predicted tick of soft clock */
- unsigned long timeout; /* Currently scheduled timeout */
- __u32 lrcvtime; /* timestamp of last received data packet */
- __u16 last_seg_size; /* Size of last incoming segment */
- __u16 rcv_mss; /* MSS used for delayed ACK decisions */
- } icsk_ack;
- struct {
- int enabled;
- /* Range of MTUs to search */
- int search_high;
- int search_low;
- /* Information on the current probe. */
- int probe_size;
- } icsk_mtup;
- u32 icsk_ca_priv[16];
- u32 icsk_user_timeout;
- #define ICSK_CA_PRIV_SIZE (16 * sizeof(u32))
- };
- #define ICSK_TIME_RETRANS 1 /* Retransmit timer */
- #define ICSK_TIME_DACK 2 /* Delayed ack timer */
- #define ICSK_TIME_PROBE0 3 /* Zero window probe timer */
- #define ICSK_TIME_EARLY_RETRANS 4 /* Early retransmit timer */
- #define ICSK_TIME_LOSS_PROBE 5 /* Tail loss probe timer */
- static inline struct inet_connection_sock *inet_csk(const struct sock *sk)
- {
- return (struct inet_connection_sock *)sk;
- }
- static inline void *inet_csk_ca(const struct sock *sk)
- {
- return (void *)inet_csk(sk)->icsk_ca_priv;
- }
- extern struct sock *inet_csk_clone_lock(const struct sock *sk,
- const struct request_sock *req,
- const gfp_t priority);
- enum inet_csk_ack_state_t {
- ICSK_ACK_SCHED = 1,
- ICSK_ACK_TIMER = 2,
- ICSK_ACK_PUSHED = 4,
- ICSK_ACK_PUSHED2 = 8
- };
- extern void inet_csk_init_xmit_timers(struct sock *sk,
- void (*retransmit_handler)(unsigned long),
- void (*delack_handler)(unsigned long),
- void (*keepalive_handler)(unsigned long));
- extern void inet_csk_clear_xmit_timers(struct sock *sk);
- static inline void inet_csk_schedule_ack(struct sock *sk)
- {
- inet_csk(sk)->icsk_ack.pending |= ICSK_ACK_SCHED;
- }
- static inline int inet_csk_ack_scheduled(const struct sock *sk)
- {
- return inet_csk(sk)->icsk_ack.pending & ICSK_ACK_SCHED;
- }
- static inline void inet_csk_delack_init(struct sock *sk)
- {
- memset(&inet_csk(sk)->icsk_ack, 0, sizeof(inet_csk(sk)->icsk_ack));
- }
- extern void inet_csk_delete_keepalive_timer(struct sock *sk);
- extern void inet_csk_reset_keepalive_timer(struct sock *sk, unsigned long timeout);
- #ifdef INET_CSK_DEBUG
- extern const char inet_csk_timer_bug_msg[];
- #endif
- static inline void inet_csk_clear_xmit_timer(struct sock *sk, const int what)
- {
- struct inet_connection_sock *icsk = inet_csk(sk);
-
- if (what == ICSK_TIME_RETRANS || what == ICSK_TIME_PROBE0) {
- icsk->icsk_pending = 0;
- #ifdef INET_CSK_CLEAR_TIMERS
- sk_stop_timer(sk, &icsk->icsk_retransmit_timer);
- #endif
- } else if (what == ICSK_TIME_DACK) {
- icsk->icsk_ack.blocked = icsk->icsk_ack.pending = 0;
- #ifdef INET_CSK_CLEAR_TIMERS
- sk_stop_timer(sk, &icsk->icsk_delack_timer);
- #endif
- }
- #ifdef INET_CSK_DEBUG
- else {
- pr_debug("%s", inet_csk_timer_bug_msg);
- }
- #endif
- }
- /*
- * Reset the retransmission timer
- */
- static inline void inet_csk_reset_xmit_timer(struct sock *sk, const int what,
- unsigned long when,
- const unsigned long max_when)
- {
- struct inet_connection_sock *icsk = inet_csk(sk);
- if (when > max_when) {
- #ifdef INET_CSK_DEBUG
- pr_debug("reset_xmit_timer: sk=%p %d when=0x%lx, caller=%p\n",
- sk, what, when, current_text_addr());
- #endif
- when = max_when;
- }
- if (what == ICSK_TIME_RETRANS || what == ICSK_TIME_PROBE0 ||
- what == ICSK_TIME_EARLY_RETRANS || what == ICSK_TIME_LOSS_PROBE) {
- icsk->icsk_pending = what;
- icsk->icsk_timeout = jiffies + when;
- sk_reset_timer(sk, &icsk->icsk_retransmit_timer, icsk->icsk_timeout);
- } else if (what == ICSK_TIME_DACK) {
- icsk->icsk_ack.pending |= ICSK_ACK_TIMER;
- icsk->icsk_ack.timeout = jiffies + when;
- sk_reset_timer(sk, &icsk->icsk_delack_timer, icsk->icsk_ack.timeout);
- }
- #ifdef INET_CSK_DEBUG
- else {
- pr_debug("%s", inet_csk_timer_bug_msg);
- }
- #endif
- }
- extern struct sock *inet_csk_accept(struct sock *sk, int flags, int *err);
- extern struct request_sock *inet_csk_search_req(const struct sock *sk,
- struct request_sock ***prevp,
- const __be16 rport,
- const __be32 raddr,
- const __be32 laddr);
- extern int inet_csk_bind_conflict(const struct sock *sk,
- const struct inet_bind_bucket *tb, bool relax);
- extern int inet_csk_get_port(struct sock *sk, unsigned short snum);
- extern struct dst_entry* inet_csk_route_req(struct sock *sk,
- struct flowi4 *fl4,
- const struct request_sock *req);
- extern struct dst_entry* inet_csk_route_child_sock(struct sock *sk,
- struct sock *newsk,
- const struct request_sock *req);
- static inline void inet_csk_reqsk_queue_add(struct sock *sk,
- struct request_sock *req,
- struct sock *child)
- {
- reqsk_queue_add(&inet_csk(sk)->icsk_accept_queue, req, sk, child);
- }
- extern void inet_csk_reqsk_queue_hash_add(struct sock *sk,
- struct request_sock *req,
- unsigned long timeout);
- static inline void inet_csk_reqsk_queue_removed(struct sock *sk,
- struct request_sock *req)
- {
- if (reqsk_queue_removed(&inet_csk(sk)->icsk_accept_queue, req) == 0)
- inet_csk_delete_keepalive_timer(sk);
- }
- static inline void inet_csk_reqsk_queue_added(struct sock *sk,
- const unsigned long timeout)
- {
- if (reqsk_queue_added(&inet_csk(sk)->icsk_accept_queue) == 0)
- inet_csk_reset_keepalive_timer(sk, timeout);
- }
- static inline int inet_csk_reqsk_queue_len(const struct sock *sk)
- {
- return reqsk_queue_len(&inet_csk(sk)->icsk_accept_queue);
- }
- static inline int inet_csk_reqsk_queue_young(const struct sock *sk)
- {
- return reqsk_queue_len_young(&inet_csk(sk)->icsk_accept_queue);
- }
- static inline int inet_csk_reqsk_queue_is_full(const struct sock *sk)
- {
- return reqsk_queue_is_full(&inet_csk(sk)->icsk_accept_queue);
- }
- static inline void inet_csk_reqsk_queue_unlink(struct sock *sk,
- struct request_sock *req,
- struct request_sock **prev)
- {
- reqsk_queue_unlink(&inet_csk(sk)->icsk_accept_queue, req, prev);
- }
- static inline void inet_csk_reqsk_queue_drop(struct sock *sk,
- struct request_sock *req,
- struct request_sock **prev)
- {
- inet_csk_reqsk_queue_unlink(sk, req, prev);
- inet_csk_reqsk_queue_removed(sk, req);
- reqsk_free(req);
- }
- extern void inet_csk_reqsk_queue_prune(struct sock *parent,
- const unsigned long interval,
- const unsigned long timeout,
- const unsigned long max_rto);
- extern void inet_csk_destroy_sock(struct sock *sk);
- extern void inet_csk_prepare_forced_close(struct sock *sk);
- /*
- * LISTEN is a special case for poll..
- */
- static inline unsigned int inet_csk_listen_poll(const struct sock *sk)
- {
- return !reqsk_queue_empty(&inet_csk(sk)->icsk_accept_queue) ?
- (POLLIN | POLLRDNORM) : 0;
- }
- extern int inet_csk_listen_start(struct sock *sk, const int nr_table_entries);
- extern void inet_csk_listen_stop(struct sock *sk);
- extern void inet_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr);
- extern int inet_csk_compat_getsockopt(struct sock *sk, int level, int optname,
- char __user *optval, int __user *optlen);
- extern int inet_csk_compat_setsockopt(struct sock *sk, int level, int optname,
- char __user *optval, unsigned int optlen);
- extern struct dst_entry *inet_csk_update_pmtu(struct sock *sk, u32 mtu);
- #endif /* _INET_CONNECTION_SOCK_H */