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Arnaldo Carvalho de Melo463c84b2005-08-09 20:10:42 -07001/*
2 * NET Generic infrastructure for INET connection oriented protocols.
3 *
4 * Definitions for inet_connection_sock
5 *
6 * Authors: Many people, see the TCP sources
7 *
8 * From code originally in TCP
9 *
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.
14 */
15#ifndef _INET_CONNECTION_SOCK_H
16#define _INET_CONNECTION_SOCK_H
17
Arnaldo Carvalho de Melo8292a172005-12-13 23:15:52 -080018#include <linux/compiler.h>
Arnaldo Carvalho de Melo3f421ba2005-08-09 20:11:08 -070019#include <linux/string.h>
Arnaldo Carvalho de Melo463c84b2005-08-09 20:10:42 -070020#include <linux/timer.h>
Al Virobd01f842006-10-19 17:23:57 -040021#include <linux/poll.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020022
23#include <net/inet_sock.h>
Arnaldo Carvalho de Melo463c84b2005-08-09 20:10:42 -070024#include <net/request_sock.h>
25
Arnaldo Carvalho de Melo3f421ba2005-08-09 20:11:08 -070026#define INET_CSK_DEBUG 1
27
28/* Cancel timers, when they are not required. */
29#undef INET_CSK_CLEAR_TIMERS
30
Arnaldo Carvalho de Melo463c84b2005-08-09 20:10:42 -070031struct inet_bind_bucket;
Arnaldo Carvalho de Melo6687e982005-08-10 04:03:31 -030032struct tcp_congestion_ops;
Arnaldo Carvalho de Melo463c84b2005-08-09 20:10:42 -070033
Arnaldo Carvalho de Melo8292a172005-12-13 23:15:52 -080034/*
35 * Pointers to address related TCP functions
36 * (i.e. things that depend on the address family)
37 */
38struct inet_connection_sock_af_ops {
David S. Millere89862f2007-01-26 01:04:55 -080039 int (*queue_xmit)(struct sk_buff *skb, int ipfragok);
Arnaldo Carvalho de Melo8292a172005-12-13 23:15:52 -080040 void (*send_check)(struct sock *sk, int len,
41 struct sk_buff *skb);
42 int (*rebuild_header)(struct sock *sk);
43 int (*conn_request)(struct sock *sk, struct sk_buff *skb);
44 struct sock *(*syn_recv_sock)(struct sock *sk, struct sk_buff *skb,
45 struct request_sock *req,
46 struct dst_entry *dst);
47 int (*remember_stamp)(struct sock *sk);
Arnaldo Carvalho de Melo850db6b2006-11-27 17:56:43 -020048 u16 net_header_len;
49 u16 sockaddr_len;
Arnaldo Carvalho de Melo8292a172005-12-13 23:15:52 -080050 int (*setsockopt)(struct sock *sk, int level, int optname,
51 char __user *optval, int optlen);
52 int (*getsockopt)(struct sock *sk, int level, int optname,
53 char __user *optval, int __user *optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -080054 int (*compat_setsockopt)(struct sock *sk,
55 int level, int optname,
56 char __user *optval, int optlen);
57 int (*compat_getsockopt)(struct sock *sk,
58 int level, int optname,
59 char __user *optval, int __user *optlen);
Arnaldo Carvalho de Melo8292a172005-12-13 23:15:52 -080060 void (*addr2sockaddr)(struct sock *sk, struct sockaddr *);
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -080061 int (*bind_conflict)(const struct sock *sk,
62 const struct inet_bind_bucket *tb);
Arnaldo Carvalho de Melo8292a172005-12-13 23:15:52 -080063};
64
Arnaldo Carvalho de Melo463c84b2005-08-09 20:10:42 -070065/** inet_connection_sock - INET connection oriented sock
66 *
67 * @icsk_accept_queue: FIFO of established children
68 * @icsk_bind_hash: Bind node
69 * @icsk_timeout: Timeout
70 * @icsk_retransmit_timer: Resend (no ack)
71 * @icsk_rto: Retransmit timeout
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -080072 * @icsk_pmtu_cookie Last pmtu seen by socket
Arnaldo Carvalho de Melo6687e982005-08-10 04:03:31 -030073 * @icsk_ca_ops Pluggable congestion control hook
Arnaldo Carvalho de Melo8292a172005-12-13 23:15:52 -080074 * @icsk_af_ops Operations which are AF_INET{4,6} specific
Arnaldo Carvalho de Melo6687e982005-08-10 04:03:31 -030075 * @icsk_ca_state: Congestion control state
Arnaldo Carvalho de Melo463c84b2005-08-09 20:10:42 -070076 * @icsk_retransmits: Number of unrecovered [RTO] timeouts
77 * @icsk_pending: Scheduled timer event
78 * @icsk_backoff: Backoff
79 * @icsk_syn_retries: Number of allowed SYN (or equivalent) retries
Arnaldo Carvalho de Melo6687e982005-08-10 04:03:31 -030080 * @icsk_probes_out: unanswered 0 window probes
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -080081 * @icsk_ext_hdr_len: Network protocol overhead (IP/IPv6 options)
Arnaldo Carvalho de Melo463c84b2005-08-09 20:10:42 -070082 * @icsk_ack: Delayed ACK control data
John Heffner5d424d52006-03-20 17:53:41 -080083 * @icsk_mtup; MTU probing control data
Arnaldo Carvalho de Melo463c84b2005-08-09 20:10:42 -070084 */
85struct inet_connection_sock {
86 /* inet_sock has to be the first member! */
87 struct inet_sock icsk_inet;
88 struct request_sock_queue icsk_accept_queue;
89 struct inet_bind_bucket *icsk_bind_hash;
90 unsigned long icsk_timeout;
91 struct timer_list icsk_retransmit_timer;
92 struct timer_list icsk_delack_timer;
93 __u32 icsk_rto;
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -080094 __u32 icsk_pmtu_cookie;
Stephen Hemminger770cfbc2006-01-09 15:56:09 -080095 const struct tcp_congestion_ops *icsk_ca_ops;
96 const struct inet_connection_sock_af_ops *icsk_af_ops;
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -080097 unsigned int (*icsk_sync_mss)(struct sock *sk, u32 pmtu);
Arnaldo Carvalho de Melo6687e982005-08-10 04:03:31 -030098 __u8 icsk_ca_state;
Arnaldo Carvalho de Melo463c84b2005-08-09 20:10:42 -070099 __u8 icsk_retransmits;
100 __u8 icsk_pending;
101 __u8 icsk_backoff;
102 __u8 icsk_syn_retries;
Arnaldo Carvalho de Melo6687e982005-08-10 04:03:31 -0300103 __u8 icsk_probes_out;
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -0800104 __u16 icsk_ext_hdr_len;
Arnaldo Carvalho de Melo463c84b2005-08-09 20:10:42 -0700105 struct {
106 __u8 pending; /* ACK is pending */
107 __u8 quick; /* Scheduled number of quick acks */
108 __u8 pingpong; /* The session is interactive */
109 __u8 blocked; /* Delayed ACK was blocked by socket lock */
110 __u32 ato; /* Predicted tick of soft clock */
111 unsigned long timeout; /* Currently scheduled timeout */
112 __u32 lrcvtime; /* timestamp of last received data packet */
113 __u16 last_seg_size; /* Size of last incoming segment */
114 __u16 rcv_mss; /* MSS used for delayed ACK decisions */
115 } icsk_ack;
John Heffner5d424d52006-03-20 17:53:41 -0800116 struct {
117 int enabled;
118
119 /* Range of MTUs to search */
120 int search_high;
121 int search_low;
122
123 /* Information on the current probe. */
124 int probe_size;
John Heffner5d424d52006-03-20 17:53:41 -0800125 } icsk_mtup;
Arnaldo Carvalho de Melo6687e982005-08-10 04:03:31 -0300126 u32 icsk_ca_priv[16];
127#define ICSK_CA_PRIV_SIZE (16 * sizeof(u32))
Arnaldo Carvalho de Melo463c84b2005-08-09 20:10:42 -0700128};
129
Arnaldo Carvalho de Melo3f421ba2005-08-09 20:11:08 -0700130#define ICSK_TIME_RETRANS 1 /* Retransmit timer */
131#define ICSK_TIME_DACK 2 /* Delayed ack timer */
132#define ICSK_TIME_PROBE0 3 /* Zero window probe timer */
133#define ICSK_TIME_KEEPOPEN 4 /* Keepalive timer */
134
Arnaldo Carvalho de Melo463c84b2005-08-09 20:10:42 -0700135static inline struct inet_connection_sock *inet_csk(const struct sock *sk)
136{
137 return (struct inet_connection_sock *)sk;
138}
139
Arnaldo Carvalho de Melo6687e982005-08-10 04:03:31 -0300140static inline void *inet_csk_ca(const struct sock *sk)
141{
142 return (void *)inet_csk(sk)->icsk_ca_priv;
143}
144
Arnaldo Carvalho de Melo9f1d2602005-08-09 20:11:24 -0700145extern struct sock *inet_csk_clone(struct sock *sk,
146 const struct request_sock *req,
Al Virodd0fc662005-10-07 07:46:04 +0100147 const gfp_t priority);
Arnaldo Carvalho de Melo9f1d2602005-08-09 20:11:24 -0700148
Arnaldo Carvalho de Melo3f421ba2005-08-09 20:11:08 -0700149enum inet_csk_ack_state_t {
150 ICSK_ACK_SCHED = 1,
151 ICSK_ACK_TIMER = 2,
Alexey Kuznetsov1ef96962006-09-19 12:52:50 -0700152 ICSK_ACK_PUSHED = 4,
153 ICSK_ACK_PUSHED2 = 8
Arnaldo Carvalho de Melo3f421ba2005-08-09 20:11:08 -0700154};
155
Arnaldo Carvalho de Melo463c84b2005-08-09 20:10:42 -0700156extern void inet_csk_init_xmit_timers(struct sock *sk,
157 void (*retransmit_handler)(unsigned long),
158 void (*delack_handler)(unsigned long),
159 void (*keepalive_handler)(unsigned long));
160extern void inet_csk_clear_xmit_timers(struct sock *sk);
161
Arnaldo Carvalho de Melo3f421ba2005-08-09 20:11:08 -0700162static inline void inet_csk_schedule_ack(struct sock *sk)
163{
164 inet_csk(sk)->icsk_ack.pending |= ICSK_ACK_SCHED;
165}
166
167static inline int inet_csk_ack_scheduled(const struct sock *sk)
168{
169 return inet_csk(sk)->icsk_ack.pending & ICSK_ACK_SCHED;
170}
171
172static inline void inet_csk_delack_init(struct sock *sk)
173{
174 memset(&inet_csk(sk)->icsk_ack, 0, sizeof(inet_csk(sk)->icsk_ack));
175}
176
177extern void inet_csk_delete_keepalive_timer(struct sock *sk);
178extern void inet_csk_reset_keepalive_timer(struct sock *sk, unsigned long timeout);
179
180#ifdef INET_CSK_DEBUG
181extern const char inet_csk_timer_bug_msg[];
182#endif
183
184static inline void inet_csk_clear_xmit_timer(struct sock *sk, const int what)
185{
186 struct inet_connection_sock *icsk = inet_csk(sk);
187
188 if (what == ICSK_TIME_RETRANS || what == ICSK_TIME_PROBE0) {
189 icsk->icsk_pending = 0;
190#ifdef INET_CSK_CLEAR_TIMERS
191 sk_stop_timer(sk, &icsk->icsk_retransmit_timer);
192#endif
193 } else if (what == ICSK_TIME_DACK) {
194 icsk->icsk_ack.blocked = icsk->icsk_ack.pending = 0;
195#ifdef INET_CSK_CLEAR_TIMERS
196 sk_stop_timer(sk, &icsk->icsk_delack_timer);
197#endif
198 }
199#ifdef INET_CSK_DEBUG
200 else {
Stephen Hemmingerd8971fc2005-08-29 22:51:28 -0700201 pr_debug("%s", inet_csk_timer_bug_msg);
Arnaldo Carvalho de Melo3f421ba2005-08-09 20:11:08 -0700202 }
203#endif
204}
205
206/*
207 * Reset the retransmission timer
208 */
209static inline void inet_csk_reset_xmit_timer(struct sock *sk, const int what,
210 unsigned long when,
211 const unsigned long max_when)
212{
213 struct inet_connection_sock *icsk = inet_csk(sk);
214
215 if (when > max_when) {
216#ifdef INET_CSK_DEBUG
217 pr_debug("reset_xmit_timer: sk=%p %d when=0x%lx, caller=%p\n",
218 sk, what, when, current_text_addr());
219#endif
220 when = max_when;
221 }
222
223 if (what == ICSK_TIME_RETRANS || what == ICSK_TIME_PROBE0) {
224 icsk->icsk_pending = what;
225 icsk->icsk_timeout = jiffies + when;
226 sk_reset_timer(sk, &icsk->icsk_retransmit_timer, icsk->icsk_timeout);
227 } else if (what == ICSK_TIME_DACK) {
228 icsk->icsk_ack.pending |= ICSK_ACK_TIMER;
229 icsk->icsk_ack.timeout = jiffies + when;
230 sk_reset_timer(sk, &icsk->icsk_delack_timer, icsk->icsk_ack.timeout);
231 }
232#ifdef INET_CSK_DEBUG
233 else {
Stephen Hemmingerd8971fc2005-08-29 22:51:28 -0700234 pr_debug("%s", inet_csk_timer_bug_msg);
Arnaldo Carvalho de Melo3f421ba2005-08-09 20:11:08 -0700235 }
236#endif
237}
238
239extern struct sock *inet_csk_accept(struct sock *sk, int flags, int *err);
240
Arnaldo Carvalho de Melo463c84b2005-08-09 20:10:42 -0700241extern struct request_sock *inet_csk_search_req(const struct sock *sk,
242 struct request_sock ***prevp,
Al Viro6b729772006-09-27 18:36:59 -0700243 const __be16 rport,
Al Viro7f25afb2006-09-27 18:27:47 -0700244 const __be32 raddr,
245 const __be32 laddr);
Arnaldo Carvalho de Melo971af182005-12-13 23:14:47 -0800246extern int inet_csk_bind_conflict(const struct sock *sk,
247 const struct inet_bind_bucket *tb);
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -0800248extern int inet_csk_get_port(struct sock *sk, unsigned short snum);
Arnaldo Carvalho de Melo463c84b2005-08-09 20:10:42 -0700249
250extern struct dst_entry* inet_csk_route_req(struct sock *sk,
251 const struct request_sock *req);
252
Arnaldo Carvalho de Melo3f421ba2005-08-09 20:11:08 -0700253static inline void inet_csk_reqsk_queue_add(struct sock *sk,
254 struct request_sock *req,
255 struct sock *child)
256{
257 reqsk_queue_add(&inet_csk(sk)->icsk_accept_queue, req, sk, child);
258}
259
260extern void inet_csk_reqsk_queue_hash_add(struct sock *sk,
261 struct request_sock *req,
Arnaldo Carvalho de Meloc2977c22005-12-13 23:15:12 -0800262 unsigned long timeout);
Arnaldo Carvalho de Melo3f421ba2005-08-09 20:11:08 -0700263
264static inline void inet_csk_reqsk_queue_removed(struct sock *sk,
265 struct request_sock *req)
266{
267 if (reqsk_queue_removed(&inet_csk(sk)->icsk_accept_queue, req) == 0)
268 inet_csk_delete_keepalive_timer(sk);
269}
270
271static inline void inet_csk_reqsk_queue_added(struct sock *sk,
272 const unsigned long timeout)
273{
274 if (reqsk_queue_added(&inet_csk(sk)->icsk_accept_queue) == 0)
275 inet_csk_reset_keepalive_timer(sk, timeout);
276}
277
278static inline int inet_csk_reqsk_queue_len(const struct sock *sk)
279{
280 return reqsk_queue_len(&inet_csk(sk)->icsk_accept_queue);
281}
282
283static inline int inet_csk_reqsk_queue_young(const struct sock *sk)
284{
285 return reqsk_queue_len_young(&inet_csk(sk)->icsk_accept_queue);
286}
287
288static inline int inet_csk_reqsk_queue_is_full(const struct sock *sk)
289{
290 return reqsk_queue_is_full(&inet_csk(sk)->icsk_accept_queue);
291}
292
293static inline void inet_csk_reqsk_queue_unlink(struct sock *sk,
294 struct request_sock *req,
295 struct request_sock **prev)
296{
297 reqsk_queue_unlink(&inet_csk(sk)->icsk_accept_queue, req, prev);
298}
299
300static inline void inet_csk_reqsk_queue_drop(struct sock *sk,
301 struct request_sock *req,
302 struct request_sock **prev)
303{
304 inet_csk_reqsk_queue_unlink(sk, req, prev);
305 inet_csk_reqsk_queue_removed(sk, req);
306 reqsk_free(req);
307}
308
Arnaldo Carvalho de Meloa019d6f2005-08-09 20:15:09 -0700309extern void inet_csk_reqsk_queue_prune(struct sock *parent,
310 const unsigned long interval,
311 const unsigned long timeout,
312 const unsigned long max_rto);
313
314extern void inet_csk_destroy_sock(struct sock *sk);
Arnaldo Carvalho de Melodc40c7b2005-08-23 21:52:58 -0700315
316/*
317 * LISTEN is a special case for poll..
318 */
319static inline unsigned int inet_csk_listen_poll(const struct sock *sk)
320{
321 return !reqsk_queue_empty(&inet_csk(sk)->icsk_accept_queue) ?
322 (POLLIN | POLLRDNORM) : 0;
323}
324
Arnaldo Carvalho de Meloa019d6f2005-08-09 20:15:09 -0700325extern int inet_csk_listen_start(struct sock *sk, const int nr_table_entries);
Arnaldo Carvalho de Melo295f7322005-08-09 20:11:56 -0700326extern void inet_csk_listen_stop(struct sock *sk);
327
Arnaldo Carvalho de Meloaf05dc92005-12-13 23:16:04 -0800328extern void inet_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr);
329
Arnaldo Carvalho de Melodec73ff2006-03-20 22:46:16 -0800330extern int inet_csk_compat_getsockopt(struct sock *sk, int level, int optname,
331 char __user *optval, int __user *optlen);
332extern int inet_csk_compat_setsockopt(struct sock *sk, int level, int optname,
333 char __user *optval, int optlen);
Arnaldo Carvalho de Melo463c84b2005-08-09 20:10:42 -0700334#endif /* _INET_CONNECTION_SOCK_H */