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463c84b9 ACM |
1 | /* |
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 | ||
18 | #include <linux/ip.h> | |
3f421baa | 19 | #include <linux/string.h> |
463c84b9 ACM |
20 | #include <linux/timer.h> |
21 | #include <net/request_sock.h> | |
22 | ||
3f421baa ACM |
23 | #define INET_CSK_DEBUG 1 |
24 | ||
25 | /* Cancel timers, when they are not required. */ | |
26 | #undef INET_CSK_CLEAR_TIMERS | |
27 | ||
463c84b9 ACM |
28 | struct inet_bind_bucket; |
29 | struct inet_hashinfo; | |
6687e988 | 30 | struct tcp_congestion_ops; |
463c84b9 ACM |
31 | |
32 | /** inet_connection_sock - INET connection oriented sock | |
33 | * | |
34 | * @icsk_accept_queue: FIFO of established children | |
35 | * @icsk_bind_hash: Bind node | |
36 | * @icsk_timeout: Timeout | |
37 | * @icsk_retransmit_timer: Resend (no ack) | |
38 | * @icsk_rto: Retransmit timeout | |
6687e988 ACM |
39 | * @icsk_ca_ops Pluggable congestion control hook |
40 | * @icsk_ca_state: Congestion control state | |
463c84b9 ACM |
41 | * @icsk_retransmits: Number of unrecovered [RTO] timeouts |
42 | * @icsk_pending: Scheduled timer event | |
43 | * @icsk_backoff: Backoff | |
44 | * @icsk_syn_retries: Number of allowed SYN (or equivalent) retries | |
6687e988 | 45 | * @icsk_probes_out: unanswered 0 window probes |
463c84b9 ACM |
46 | * @icsk_ack: Delayed ACK control data |
47 | */ | |
48 | struct inet_connection_sock { | |
49 | /* inet_sock has to be the first member! */ | |
50 | struct inet_sock icsk_inet; | |
51 | struct request_sock_queue icsk_accept_queue; | |
52 | struct inet_bind_bucket *icsk_bind_hash; | |
53 | unsigned long icsk_timeout; | |
54 | struct timer_list icsk_retransmit_timer; | |
55 | struct timer_list icsk_delack_timer; | |
56 | __u32 icsk_rto; | |
6687e988 ACM |
57 | struct tcp_congestion_ops *icsk_ca_ops; |
58 | __u8 icsk_ca_state; | |
463c84b9 ACM |
59 | __u8 icsk_retransmits; |
60 | __u8 icsk_pending; | |
61 | __u8 icsk_backoff; | |
62 | __u8 icsk_syn_retries; | |
6687e988 ACM |
63 | __u8 icsk_probes_out; |
64 | /* 2 BYTES HOLE, TRY TO PACK! */ | |
463c84b9 ACM |
65 | struct { |
66 | __u8 pending; /* ACK is pending */ | |
67 | __u8 quick; /* Scheduled number of quick acks */ | |
68 | __u8 pingpong; /* The session is interactive */ | |
69 | __u8 blocked; /* Delayed ACK was blocked by socket lock */ | |
70 | __u32 ato; /* Predicted tick of soft clock */ | |
71 | unsigned long timeout; /* Currently scheduled timeout */ | |
72 | __u32 lrcvtime; /* timestamp of last received data packet */ | |
73 | __u16 last_seg_size; /* Size of last incoming segment */ | |
74 | __u16 rcv_mss; /* MSS used for delayed ACK decisions */ | |
75 | } icsk_ack; | |
6687e988 ACM |
76 | u32 icsk_ca_priv[16]; |
77 | #define ICSK_CA_PRIV_SIZE (16 * sizeof(u32)) | |
463c84b9 ACM |
78 | }; |
79 | ||
3f421baa ACM |
80 | #define ICSK_TIME_RETRANS 1 /* Retransmit timer */ |
81 | #define ICSK_TIME_DACK 2 /* Delayed ack timer */ | |
82 | #define ICSK_TIME_PROBE0 3 /* Zero window probe timer */ | |
83 | #define ICSK_TIME_KEEPOPEN 4 /* Keepalive timer */ | |
84 | ||
463c84b9 ACM |
85 | static inline struct inet_connection_sock *inet_csk(const struct sock *sk) |
86 | { | |
87 | return (struct inet_connection_sock *)sk; | |
88 | } | |
89 | ||
6687e988 ACM |
90 | static inline void *inet_csk_ca(const struct sock *sk) |
91 | { | |
92 | return (void *)inet_csk(sk)->icsk_ca_priv; | |
93 | } | |
94 | ||
9f1d2604 ACM |
95 | extern struct sock *inet_csk_clone(struct sock *sk, |
96 | const struct request_sock *req, | |
97 | const unsigned int __nocast priority); | |
98 | ||
3f421baa ACM |
99 | enum inet_csk_ack_state_t { |
100 | ICSK_ACK_SCHED = 1, | |
101 | ICSK_ACK_TIMER = 2, | |
102 | ICSK_ACK_PUSHED = 4 | |
103 | }; | |
104 | ||
463c84b9 ACM |
105 | extern void inet_csk_init_xmit_timers(struct sock *sk, |
106 | void (*retransmit_handler)(unsigned long), | |
107 | void (*delack_handler)(unsigned long), | |
108 | void (*keepalive_handler)(unsigned long)); | |
109 | extern void inet_csk_clear_xmit_timers(struct sock *sk); | |
110 | ||
3f421baa ACM |
111 | static inline void inet_csk_schedule_ack(struct sock *sk) |
112 | { | |
113 | inet_csk(sk)->icsk_ack.pending |= ICSK_ACK_SCHED; | |
114 | } | |
115 | ||
116 | static inline int inet_csk_ack_scheduled(const struct sock *sk) | |
117 | { | |
118 | return inet_csk(sk)->icsk_ack.pending & ICSK_ACK_SCHED; | |
119 | } | |
120 | ||
121 | static inline void inet_csk_delack_init(struct sock *sk) | |
122 | { | |
123 | memset(&inet_csk(sk)->icsk_ack, 0, sizeof(inet_csk(sk)->icsk_ack)); | |
124 | } | |
125 | ||
126 | extern void inet_csk_delete_keepalive_timer(struct sock *sk); | |
127 | extern void inet_csk_reset_keepalive_timer(struct sock *sk, unsigned long timeout); | |
128 | ||
129 | #ifdef INET_CSK_DEBUG | |
130 | extern const char inet_csk_timer_bug_msg[]; | |
131 | #endif | |
132 | ||
133 | static inline void inet_csk_clear_xmit_timer(struct sock *sk, const int what) | |
134 | { | |
135 | struct inet_connection_sock *icsk = inet_csk(sk); | |
136 | ||
137 | if (what == ICSK_TIME_RETRANS || what == ICSK_TIME_PROBE0) { | |
138 | icsk->icsk_pending = 0; | |
139 | #ifdef INET_CSK_CLEAR_TIMERS | |
140 | sk_stop_timer(sk, &icsk->icsk_retransmit_timer); | |
141 | #endif | |
142 | } else if (what == ICSK_TIME_DACK) { | |
143 | icsk->icsk_ack.blocked = icsk->icsk_ack.pending = 0; | |
144 | #ifdef INET_CSK_CLEAR_TIMERS | |
145 | sk_stop_timer(sk, &icsk->icsk_delack_timer); | |
146 | #endif | |
147 | } | |
148 | #ifdef INET_CSK_DEBUG | |
149 | else { | |
150 | pr_debug(inet_csk_timer_bug_msg); | |
151 | } | |
152 | #endif | |
153 | } | |
154 | ||
155 | /* | |
156 | * Reset the retransmission timer | |
157 | */ | |
158 | static inline void inet_csk_reset_xmit_timer(struct sock *sk, const int what, | |
159 | unsigned long when, | |
160 | const unsigned long max_when) | |
161 | { | |
162 | struct inet_connection_sock *icsk = inet_csk(sk); | |
163 | ||
164 | if (when > max_when) { | |
165 | #ifdef INET_CSK_DEBUG | |
166 | pr_debug("reset_xmit_timer: sk=%p %d when=0x%lx, caller=%p\n", | |
167 | sk, what, when, current_text_addr()); | |
168 | #endif | |
169 | when = max_when; | |
170 | } | |
171 | ||
172 | if (what == ICSK_TIME_RETRANS || what == ICSK_TIME_PROBE0) { | |
173 | icsk->icsk_pending = what; | |
174 | icsk->icsk_timeout = jiffies + when; | |
175 | sk_reset_timer(sk, &icsk->icsk_retransmit_timer, icsk->icsk_timeout); | |
176 | } else if (what == ICSK_TIME_DACK) { | |
177 | icsk->icsk_ack.pending |= ICSK_ACK_TIMER; | |
178 | icsk->icsk_ack.timeout = jiffies + when; | |
179 | sk_reset_timer(sk, &icsk->icsk_delack_timer, icsk->icsk_ack.timeout); | |
180 | } | |
181 | #ifdef INET_CSK_DEBUG | |
182 | else { | |
183 | pr_debug(inet_csk_timer_bug_msg); | |
184 | } | |
185 | #endif | |
186 | } | |
187 | ||
188 | extern struct sock *inet_csk_accept(struct sock *sk, int flags, int *err); | |
189 | ||
463c84b9 ACM |
190 | extern struct request_sock *inet_csk_search_req(const struct sock *sk, |
191 | struct request_sock ***prevp, | |
192 | const __u16 rport, | |
193 | const __u32 raddr, | |
194 | const __u32 laddr); | |
195 | extern int inet_csk_get_port(struct inet_hashinfo *hashinfo, | |
196 | struct sock *sk, unsigned short snum); | |
197 | ||
198 | extern struct dst_entry* inet_csk_route_req(struct sock *sk, | |
199 | const struct request_sock *req); | |
200 | ||
3f421baa ACM |
201 | static inline void inet_csk_reqsk_queue_add(struct sock *sk, |
202 | struct request_sock *req, | |
203 | struct sock *child) | |
204 | { | |
205 | reqsk_queue_add(&inet_csk(sk)->icsk_accept_queue, req, sk, child); | |
206 | } | |
207 | ||
208 | extern void inet_csk_reqsk_queue_hash_add(struct sock *sk, | |
209 | struct request_sock *req, | |
210 | const unsigned timeout); | |
211 | ||
212 | static inline void inet_csk_reqsk_queue_removed(struct sock *sk, | |
213 | struct request_sock *req) | |
214 | { | |
215 | if (reqsk_queue_removed(&inet_csk(sk)->icsk_accept_queue, req) == 0) | |
216 | inet_csk_delete_keepalive_timer(sk); | |
217 | } | |
218 | ||
219 | static inline void inet_csk_reqsk_queue_added(struct sock *sk, | |
220 | const unsigned long timeout) | |
221 | { | |
222 | if (reqsk_queue_added(&inet_csk(sk)->icsk_accept_queue) == 0) | |
223 | inet_csk_reset_keepalive_timer(sk, timeout); | |
224 | } | |
225 | ||
226 | static inline int inet_csk_reqsk_queue_len(const struct sock *sk) | |
227 | { | |
228 | return reqsk_queue_len(&inet_csk(sk)->icsk_accept_queue); | |
229 | } | |
230 | ||
231 | static inline int inet_csk_reqsk_queue_young(const struct sock *sk) | |
232 | { | |
233 | return reqsk_queue_len_young(&inet_csk(sk)->icsk_accept_queue); | |
234 | } | |
235 | ||
236 | static inline int inet_csk_reqsk_queue_is_full(const struct sock *sk) | |
237 | { | |
238 | return reqsk_queue_is_full(&inet_csk(sk)->icsk_accept_queue); | |
239 | } | |
240 | ||
241 | static inline void inet_csk_reqsk_queue_unlink(struct sock *sk, | |
242 | struct request_sock *req, | |
243 | struct request_sock **prev) | |
244 | { | |
245 | reqsk_queue_unlink(&inet_csk(sk)->icsk_accept_queue, req, prev); | |
246 | } | |
247 | ||
248 | static inline void inet_csk_reqsk_queue_drop(struct sock *sk, | |
249 | struct request_sock *req, | |
250 | struct request_sock **prev) | |
251 | { | |
252 | inet_csk_reqsk_queue_unlink(sk, req, prev); | |
253 | inet_csk_reqsk_queue_removed(sk, req); | |
254 | reqsk_free(req); | |
255 | } | |
256 | ||
a019d6fe ACM |
257 | extern void inet_csk_reqsk_queue_prune(struct sock *parent, |
258 | const unsigned long interval, | |
259 | const unsigned long timeout, | |
260 | const unsigned long max_rto); | |
261 | ||
262 | extern void inet_csk_destroy_sock(struct sock *sk); | |
dc40c7bc ACM |
263 | |
264 | /* | |
265 | * LISTEN is a special case for poll.. | |
266 | */ | |
267 | static inline unsigned int inet_csk_listen_poll(const struct sock *sk) | |
268 | { | |
269 | return !reqsk_queue_empty(&inet_csk(sk)->icsk_accept_queue) ? | |
270 | (POLLIN | POLLRDNORM) : 0; | |
271 | } | |
272 | ||
a019d6fe | 273 | extern int inet_csk_listen_start(struct sock *sk, const int nr_table_entries); |
295f7324 ACM |
274 | extern void inet_csk_listen_stop(struct sock *sk); |
275 | ||
463c84b9 | 276 | #endif /* _INET_CONNECTION_SOCK_H */ |