2 * NET Generic infrastructure for INET connection oriented protocols.
4 * Definitions for inet_connection_sock
6 * Authors: Many people, see the TCP sources
8 * From code originally in TCP
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
15 #ifndef _INET_CONNECTION_SOCK_H
16 #define _INET_CONNECTION_SOCK_H
18 #include <linux/compiler.h>
19 #include <linux/string.h>
20 #include <linux/timer.h>
21 #include <linux/poll.h>
23 #include <net/inet_sock.h>
24 #include <net/request_sock.h>
26 #define INET_CSK_DEBUG 1
28 /* Cancel timers, when they are not required. */
29 #undef INET_CSK_CLEAR_TIMERS
31 struct inet_bind_bucket;
32 struct tcp_congestion_ops;
35 * Pointers to address related TCP functions
36 * (i.e. things that depend on the address family)
38 struct inet_connection_sock_af_ops {
39 int (*queue_xmit)(struct sk_buff *skb);
40 void (*send_check)(struct sock *sk, struct sk_buff *skb);
41 int (*rebuild_header)(struct sock *sk);
42 int (*conn_request)(struct sock *sk, struct sk_buff *skb);
43 struct sock *(*syn_recv_sock)(struct sock *sk, struct sk_buff *skb,
44 struct request_sock *req,
45 struct dst_entry *dst);
46 int (*remember_stamp)(struct sock *sk);
49 int (*setsockopt)(struct sock *sk, int level, int optname,
50 char __user *optval, unsigned int optlen);
51 int (*getsockopt)(struct sock *sk, int level, int optname,
52 char __user *optval, int __user *optlen);
54 int (*compat_setsockopt)(struct sock *sk,
55 int level, int optname,
56 char __user *optval, unsigned int optlen);
57 int (*compat_getsockopt)(struct sock *sk,
58 int level, int optname,
59 char __user *optval, int __user *optlen);
61 void (*addr2sockaddr)(struct sock *sk, struct sockaddr *);
62 int (*bind_conflict)(const struct sock *sk,
63 const struct inet_bind_bucket *tb);
66 /** inet_connection_sock - INET connection oriented sock
68 * @icsk_accept_queue: FIFO of established children
69 * @icsk_bind_hash: Bind node
70 * @icsk_timeout: Timeout
71 * @icsk_retransmit_timer: Resend (no ack)
72 * @icsk_rto: Retransmit timeout
73 * @icsk_pmtu_cookie Last pmtu seen by socket
74 * @icsk_ca_ops Pluggable congestion control hook
75 * @icsk_af_ops Operations which are AF_INET{4,6} specific
76 * @icsk_ca_state: Congestion control state
77 * @icsk_retransmits: Number of unrecovered [RTO] timeouts
78 * @icsk_pending: Scheduled timer event
79 * @icsk_backoff: Backoff
80 * @icsk_syn_retries: Number of allowed SYN (or equivalent) retries
81 * @icsk_probes_out: unanswered 0 window probes
82 * @icsk_ext_hdr_len: Network protocol overhead (IP/IPv6 options)
83 * @icsk_ack: Delayed ACK control data
84 * @icsk_mtup; MTU probing control data
86 struct inet_connection_sock {
87 /* inet_sock has to be the first member! */
88 struct inet_sock icsk_inet;
89 struct request_sock_queue icsk_accept_queue;
90 struct inet_bind_bucket *icsk_bind_hash;
91 unsigned long icsk_timeout;
92 struct timer_list icsk_retransmit_timer;
93 struct timer_list icsk_delack_timer;
95 __u32 icsk_pmtu_cookie;
96 const struct tcp_congestion_ops *icsk_ca_ops;
97 const struct inet_connection_sock_af_ops *icsk_af_ops;
98 unsigned int (*icsk_sync_mss)(struct sock *sk, u32 pmtu);
100 __u8 icsk_retransmits;
103 __u8 icsk_syn_retries;
104 __u8 icsk_probes_out;
105 __u16 icsk_ext_hdr_len;
107 __u8 pending; /* ACK is pending */
108 __u8 quick; /* Scheduled number of quick acks */
109 __u8 pingpong; /* The session is interactive */
110 __u8 blocked; /* Delayed ACK was blocked by socket lock */
111 __u32 ato; /* Predicted tick of soft clock */
112 unsigned long timeout; /* Currently scheduled timeout */
113 __u32 lrcvtime; /* timestamp of last received data packet */
114 __u16 last_seg_size; /* Size of last incoming segment */
115 __u16 rcv_mss; /* MSS used for delayed ACK decisions */
120 /* Range of MTUs to search */
124 /* Information on the current probe. */
127 u32 icsk_ca_priv[16];
128 #define ICSK_CA_PRIV_SIZE (16 * sizeof(u32))
131 #define ICSK_TIME_RETRANS 1 /* Retransmit timer */
132 #define ICSK_TIME_DACK 2 /* Delayed ack timer */
133 #define ICSK_TIME_PROBE0 3 /* Zero window probe timer */
134 #define ICSK_TIME_KEEPOPEN 4 /* Keepalive timer */
136 static inline struct inet_connection_sock *inet_csk(const struct sock *sk)
138 return (struct inet_connection_sock *)sk;
141 static inline void *inet_csk_ca(const struct sock *sk)
143 return (void *)inet_csk(sk)->icsk_ca_priv;
146 extern struct sock *inet_csk_clone(struct sock *sk,
147 const struct request_sock *req,
148 const gfp_t priority);
150 enum inet_csk_ack_state_t {
157 extern void inet_csk_init_xmit_timers(struct sock *sk,
158 void (*retransmit_handler)(unsigned long),
159 void (*delack_handler)(unsigned long),
160 void (*keepalive_handler)(unsigned long));
161 extern void inet_csk_clear_xmit_timers(struct sock *sk);
163 static inline void inet_csk_schedule_ack(struct sock *sk)
165 inet_csk(sk)->icsk_ack.pending |= ICSK_ACK_SCHED;
168 static inline int inet_csk_ack_scheduled(const struct sock *sk)
170 return inet_csk(sk)->icsk_ack.pending & ICSK_ACK_SCHED;
173 static inline void inet_csk_delack_init(struct sock *sk)
175 memset(&inet_csk(sk)->icsk_ack, 0, sizeof(inet_csk(sk)->icsk_ack));
178 extern void inet_csk_delete_keepalive_timer(struct sock *sk);
179 extern void inet_csk_reset_keepalive_timer(struct sock *sk, unsigned long timeout);
181 #ifdef INET_CSK_DEBUG
182 extern const char inet_csk_timer_bug_msg[];
185 static inline void inet_csk_clear_xmit_timer(struct sock *sk, const int what)
187 struct inet_connection_sock *icsk = inet_csk(sk);
189 if (what == ICSK_TIME_RETRANS || what == ICSK_TIME_PROBE0) {
190 icsk->icsk_pending = 0;
191 #ifdef INET_CSK_CLEAR_TIMERS
192 sk_stop_timer(sk, &icsk->icsk_retransmit_timer);
194 } else if (what == ICSK_TIME_DACK) {
195 icsk->icsk_ack.blocked = icsk->icsk_ack.pending = 0;
196 #ifdef INET_CSK_CLEAR_TIMERS
197 sk_stop_timer(sk, &icsk->icsk_delack_timer);
200 #ifdef INET_CSK_DEBUG
202 pr_debug("%s", inet_csk_timer_bug_msg);
208 * Reset the retransmission timer
210 static inline void inet_csk_reset_xmit_timer(struct sock *sk, const int what,
212 const unsigned long max_when)
214 struct inet_connection_sock *icsk = inet_csk(sk);
216 if (when > max_when) {
217 #ifdef INET_CSK_DEBUG
218 pr_debug("reset_xmit_timer: sk=%p %d when=0x%lx, caller=%p\n",
219 sk, what, when, current_text_addr());
224 if (what == ICSK_TIME_RETRANS || what == ICSK_TIME_PROBE0) {
225 icsk->icsk_pending = what;
226 icsk->icsk_timeout = jiffies + when;
227 sk_reset_timer(sk, &icsk->icsk_retransmit_timer, icsk->icsk_timeout);
228 } else if (what == ICSK_TIME_DACK) {
229 icsk->icsk_ack.pending |= ICSK_ACK_TIMER;
230 icsk->icsk_ack.timeout = jiffies + when;
231 sk_reset_timer(sk, &icsk->icsk_delack_timer, icsk->icsk_ack.timeout);
233 #ifdef INET_CSK_DEBUG
235 pr_debug("%s", inet_csk_timer_bug_msg);
240 extern struct sock *inet_csk_accept(struct sock *sk, int flags, int *err);
242 extern struct request_sock *inet_csk_search_req(const struct sock *sk,
243 struct request_sock ***prevp,
247 extern int inet_csk_bind_conflict(const struct sock *sk,
248 const struct inet_bind_bucket *tb);
249 extern int inet_csk_get_port(struct sock *sk, unsigned short snum);
251 extern struct dst_entry* inet_csk_route_req(struct sock *sk,
252 const struct request_sock *req);
254 static inline void inet_csk_reqsk_queue_add(struct sock *sk,
255 struct request_sock *req,
258 reqsk_queue_add(&inet_csk(sk)->icsk_accept_queue, req, sk, child);
261 extern void inet_csk_reqsk_queue_hash_add(struct sock *sk,
262 struct request_sock *req,
263 unsigned long timeout);
265 static inline void inet_csk_reqsk_queue_removed(struct sock *sk,
266 struct request_sock *req)
268 if (reqsk_queue_removed(&inet_csk(sk)->icsk_accept_queue, req) == 0)
269 inet_csk_delete_keepalive_timer(sk);
272 static inline void inet_csk_reqsk_queue_added(struct sock *sk,
273 const unsigned long timeout)
275 if (reqsk_queue_added(&inet_csk(sk)->icsk_accept_queue) == 0)
276 inet_csk_reset_keepalive_timer(sk, timeout);
279 static inline int inet_csk_reqsk_queue_len(const struct sock *sk)
281 return reqsk_queue_len(&inet_csk(sk)->icsk_accept_queue);
284 static inline int inet_csk_reqsk_queue_young(const struct sock *sk)
286 return reqsk_queue_len_young(&inet_csk(sk)->icsk_accept_queue);
289 static inline int inet_csk_reqsk_queue_is_full(const struct sock *sk)
291 return reqsk_queue_is_full(&inet_csk(sk)->icsk_accept_queue);
294 static inline void inet_csk_reqsk_queue_unlink(struct sock *sk,
295 struct request_sock *req,
296 struct request_sock **prev)
298 reqsk_queue_unlink(&inet_csk(sk)->icsk_accept_queue, req, prev);
301 static inline void inet_csk_reqsk_queue_drop(struct sock *sk,
302 struct request_sock *req,
303 struct request_sock **prev)
305 inet_csk_reqsk_queue_unlink(sk, req, prev);
306 inet_csk_reqsk_queue_removed(sk, req);
310 extern void inet_csk_reqsk_queue_prune(struct sock *parent,
311 const unsigned long interval,
312 const unsigned long timeout,
313 const unsigned long max_rto);
315 extern void inet_csk_destroy_sock(struct sock *sk);
318 * LISTEN is a special case for poll..
320 static inline unsigned int inet_csk_listen_poll(const struct sock *sk)
322 return !reqsk_queue_empty(&inet_csk(sk)->icsk_accept_queue) ?
323 (POLLIN | POLLRDNORM) : 0;
326 extern int inet_csk_listen_start(struct sock *sk, const int nr_table_entries);
327 extern void inet_csk_listen_stop(struct sock *sk);
329 extern void inet_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr);
331 extern int inet_csk_compat_getsockopt(struct sock *sk, int level, int optname,
332 char __user *optval, int __user *optlen);
333 extern int inet_csk_compat_setsockopt(struct sock *sk, int level, int optname,
334 char __user *optval, unsigned int optlen);
335 #endif /* _INET_CONNECTION_SOCK_H */