| /* |
| * 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); |
| 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); |
| struct inet_peer *(*get_peer)(struct sock *sk); |
| 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); |
| }; |
| |
| /** 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_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 */ |
| |
| 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) { |
| 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, |
| bool nocache); |
| 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); |
| |
| /* |
| * 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); |
| #endif /* _INET_CONNECTION_SOCK_H */ |