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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 | ||
8292a17a | 18 | #include <linux/compiler.h> |
3f421baa | 19 | #include <linux/string.h> |
463c84b9 | 20 | #include <linux/timer.h> |
14c85021 ACM |
21 | |
22 | #include <net/inet_sock.h> | |
463c84b9 ACM |
23 | #include <net/request_sock.h> |
24 | ||
3f421baa ACM |
25 | #define INET_CSK_DEBUG 1 |
26 | ||
27 | /* Cancel timers, when they are not required. */ | |
28 | #undef INET_CSK_CLEAR_TIMERS | |
29 | ||
463c84b9 ACM |
30 | struct inet_bind_bucket; |
31 | struct inet_hashinfo; | |
6687e988 | 32 | struct tcp_congestion_ops; |
463c84b9 | 33 | |
8292a17a ACM |
34 | /* |
35 | * Pointers to address related TCP functions | |
36 | * (i.e. things that depend on the address family) | |
37 | */ | |
38 | struct inet_connection_sock_af_ops { | |
39 | int (*queue_xmit)(struct sk_buff *skb, int ipfragok); | |
40 | 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); | |
48 | __u16 net_header_len; | |
49 | int (*setsockopt)(struct sock *sk, int level, int optname, | |
50 | char __user *optval, int optlen); | |
51 | int (*getsockopt)(struct sock *sk, int level, int optname, | |
52 | char __user *optval, int __user *optlen); | |
53 | void (*addr2sockaddr)(struct sock *sk, struct sockaddr *); | |
54 | int sockaddr_len; | |
55 | }; | |
56 | ||
463c84b9 ACM |
57 | /** inet_connection_sock - INET connection oriented sock |
58 | * | |
59 | * @icsk_accept_queue: FIFO of established children | |
60 | * @icsk_bind_hash: Bind node | |
61 | * @icsk_timeout: Timeout | |
62 | * @icsk_retransmit_timer: Resend (no ack) | |
63 | * @icsk_rto: Retransmit timeout | |
d83d8461 | 64 | * @icsk_pmtu_cookie Last pmtu seen by socket |
6687e988 | 65 | * @icsk_ca_ops Pluggable congestion control hook |
8292a17a | 66 | * @icsk_af_ops Operations which are AF_INET{4,6} specific |
6687e988 | 67 | * @icsk_ca_state: Congestion control state |
463c84b9 ACM |
68 | * @icsk_retransmits: Number of unrecovered [RTO] timeouts |
69 | * @icsk_pending: Scheduled timer event | |
70 | * @icsk_backoff: Backoff | |
71 | * @icsk_syn_retries: Number of allowed SYN (or equivalent) retries | |
6687e988 | 72 | * @icsk_probes_out: unanswered 0 window probes |
d83d8461 | 73 | * @icsk_ext_hdr_len: Network protocol overhead (IP/IPv6 options) |
463c84b9 | 74 | * @icsk_ack: Delayed ACK control data |
5d424d5a | 75 | * @icsk_mtup; MTU probing control data |
463c84b9 ACM |
76 | */ |
77 | struct inet_connection_sock { | |
78 | /* inet_sock has to be the first member! */ | |
79 | struct inet_sock icsk_inet; | |
80 | struct request_sock_queue icsk_accept_queue; | |
81 | struct inet_bind_bucket *icsk_bind_hash; | |
82 | unsigned long icsk_timeout; | |
83 | struct timer_list icsk_retransmit_timer; | |
84 | struct timer_list icsk_delack_timer; | |
85 | __u32 icsk_rto; | |
d83d8461 | 86 | __u32 icsk_pmtu_cookie; |
770cfbcf SH |
87 | const struct tcp_congestion_ops *icsk_ca_ops; |
88 | const struct inet_connection_sock_af_ops *icsk_af_ops; | |
d83d8461 | 89 | unsigned int (*icsk_sync_mss)(struct sock *sk, u32 pmtu); |
6687e988 | 90 | __u8 icsk_ca_state; |
463c84b9 ACM |
91 | __u8 icsk_retransmits; |
92 | __u8 icsk_pending; | |
93 | __u8 icsk_backoff; | |
94 | __u8 icsk_syn_retries; | |
6687e988 | 95 | __u8 icsk_probes_out; |
d83d8461 | 96 | __u16 icsk_ext_hdr_len; |
463c84b9 ACM |
97 | struct { |
98 | __u8 pending; /* ACK is pending */ | |
99 | __u8 quick; /* Scheduled number of quick acks */ | |
100 | __u8 pingpong; /* The session is interactive */ | |
101 | __u8 blocked; /* Delayed ACK was blocked by socket lock */ | |
102 | __u32 ato; /* Predicted tick of soft clock */ | |
103 | unsigned long timeout; /* Currently scheduled timeout */ | |
104 | __u32 lrcvtime; /* timestamp of last received data packet */ | |
105 | __u16 last_seg_size; /* Size of last incoming segment */ | |
106 | __u16 rcv_mss; /* MSS used for delayed ACK decisions */ | |
107 | } icsk_ack; | |
5d424d5a JH |
108 | struct { |
109 | int enabled; | |
110 | ||
111 | /* Range of MTUs to search */ | |
112 | int search_high; | |
113 | int search_low; | |
114 | ||
115 | /* Information on the current probe. */ | |
116 | int probe_size; | |
5d424d5a | 117 | } icsk_mtup; |
6687e988 ACM |
118 | u32 icsk_ca_priv[16]; |
119 | #define ICSK_CA_PRIV_SIZE (16 * sizeof(u32)) | |
463c84b9 ACM |
120 | }; |
121 | ||
3f421baa ACM |
122 | #define ICSK_TIME_RETRANS 1 /* Retransmit timer */ |
123 | #define ICSK_TIME_DACK 2 /* Delayed ack timer */ | |
124 | #define ICSK_TIME_PROBE0 3 /* Zero window probe timer */ | |
125 | #define ICSK_TIME_KEEPOPEN 4 /* Keepalive timer */ | |
126 | ||
463c84b9 ACM |
127 | static inline struct inet_connection_sock *inet_csk(const struct sock *sk) |
128 | { | |
129 | return (struct inet_connection_sock *)sk; | |
130 | } | |
131 | ||
6687e988 ACM |
132 | static inline void *inet_csk_ca(const struct sock *sk) |
133 | { | |
134 | return (void *)inet_csk(sk)->icsk_ca_priv; | |
135 | } | |
136 | ||
9f1d2604 ACM |
137 | extern struct sock *inet_csk_clone(struct sock *sk, |
138 | const struct request_sock *req, | |
dd0fc66f | 139 | const gfp_t priority); |
9f1d2604 | 140 | |
3f421baa ACM |
141 | enum inet_csk_ack_state_t { |
142 | ICSK_ACK_SCHED = 1, | |
143 | ICSK_ACK_TIMER = 2, | |
144 | ICSK_ACK_PUSHED = 4 | |
145 | }; | |
146 | ||
463c84b9 ACM |
147 | extern void inet_csk_init_xmit_timers(struct sock *sk, |
148 | void (*retransmit_handler)(unsigned long), | |
149 | void (*delack_handler)(unsigned long), | |
150 | void (*keepalive_handler)(unsigned long)); | |
151 | extern void inet_csk_clear_xmit_timers(struct sock *sk); | |
152 | ||
3f421baa ACM |
153 | static inline void inet_csk_schedule_ack(struct sock *sk) |
154 | { | |
155 | inet_csk(sk)->icsk_ack.pending |= ICSK_ACK_SCHED; | |
156 | } | |
157 | ||
158 | static inline int inet_csk_ack_scheduled(const struct sock *sk) | |
159 | { | |
160 | return inet_csk(sk)->icsk_ack.pending & ICSK_ACK_SCHED; | |
161 | } | |
162 | ||
163 | static inline void inet_csk_delack_init(struct sock *sk) | |
164 | { | |
165 | memset(&inet_csk(sk)->icsk_ack, 0, sizeof(inet_csk(sk)->icsk_ack)); | |
166 | } | |
167 | ||
168 | extern void inet_csk_delete_keepalive_timer(struct sock *sk); | |
169 | extern void inet_csk_reset_keepalive_timer(struct sock *sk, unsigned long timeout); | |
170 | ||
171 | #ifdef INET_CSK_DEBUG | |
172 | extern const char inet_csk_timer_bug_msg[]; | |
173 | #endif | |
174 | ||
175 | static inline void inet_csk_clear_xmit_timer(struct sock *sk, const int what) | |
176 | { | |
177 | struct inet_connection_sock *icsk = inet_csk(sk); | |
178 | ||
179 | if (what == ICSK_TIME_RETRANS || what == ICSK_TIME_PROBE0) { | |
180 | icsk->icsk_pending = 0; | |
181 | #ifdef INET_CSK_CLEAR_TIMERS | |
182 | sk_stop_timer(sk, &icsk->icsk_retransmit_timer); | |
183 | #endif | |
184 | } else if (what == ICSK_TIME_DACK) { | |
185 | icsk->icsk_ack.blocked = icsk->icsk_ack.pending = 0; | |
186 | #ifdef INET_CSK_CLEAR_TIMERS | |
187 | sk_stop_timer(sk, &icsk->icsk_delack_timer); | |
188 | #endif | |
189 | } | |
190 | #ifdef INET_CSK_DEBUG | |
191 | else { | |
d8971fcb | 192 | pr_debug("%s", inet_csk_timer_bug_msg); |
3f421baa ACM |
193 | } |
194 | #endif | |
195 | } | |
196 | ||
197 | /* | |
198 | * Reset the retransmission timer | |
199 | */ | |
200 | static inline void inet_csk_reset_xmit_timer(struct sock *sk, const int what, | |
201 | unsigned long when, | |
202 | const unsigned long max_when) | |
203 | { | |
204 | struct inet_connection_sock *icsk = inet_csk(sk); | |
205 | ||
206 | if (when > max_when) { | |
207 | #ifdef INET_CSK_DEBUG | |
208 | pr_debug("reset_xmit_timer: sk=%p %d when=0x%lx, caller=%p\n", | |
209 | sk, what, when, current_text_addr()); | |
210 | #endif | |
211 | when = max_when; | |
212 | } | |
213 | ||
214 | if (what == ICSK_TIME_RETRANS || what == ICSK_TIME_PROBE0) { | |
215 | icsk->icsk_pending = what; | |
216 | icsk->icsk_timeout = jiffies + when; | |
217 | sk_reset_timer(sk, &icsk->icsk_retransmit_timer, icsk->icsk_timeout); | |
218 | } else if (what == ICSK_TIME_DACK) { | |
219 | icsk->icsk_ack.pending |= ICSK_ACK_TIMER; | |
220 | icsk->icsk_ack.timeout = jiffies + when; | |
221 | sk_reset_timer(sk, &icsk->icsk_delack_timer, icsk->icsk_ack.timeout); | |
222 | } | |
223 | #ifdef INET_CSK_DEBUG | |
224 | else { | |
d8971fcb | 225 | pr_debug("%s", inet_csk_timer_bug_msg); |
3f421baa ACM |
226 | } |
227 | #endif | |
228 | } | |
229 | ||
230 | extern struct sock *inet_csk_accept(struct sock *sk, int flags, int *err); | |
231 | ||
463c84b9 ACM |
232 | extern struct request_sock *inet_csk_search_req(const struct sock *sk, |
233 | struct request_sock ***prevp, | |
234 | const __u16 rport, | |
235 | const __u32 raddr, | |
236 | const __u32 laddr); | |
971af18b ACM |
237 | extern int inet_csk_bind_conflict(const struct sock *sk, |
238 | const struct inet_bind_bucket *tb); | |
463c84b9 | 239 | extern int inet_csk_get_port(struct inet_hashinfo *hashinfo, |
971af18b ACM |
240 | struct sock *sk, unsigned short snum, |
241 | int (*bind_conflict)(const struct sock *sk, | |
242 | const struct inet_bind_bucket *tb)); | |
463c84b9 ACM |
243 | |
244 | extern struct dst_entry* inet_csk_route_req(struct sock *sk, | |
245 | const struct request_sock *req); | |
246 | ||
3f421baa ACM |
247 | static inline void inet_csk_reqsk_queue_add(struct sock *sk, |
248 | struct request_sock *req, | |
249 | struct sock *child) | |
250 | { | |
251 | reqsk_queue_add(&inet_csk(sk)->icsk_accept_queue, req, sk, child); | |
252 | } | |
253 | ||
254 | extern void inet_csk_reqsk_queue_hash_add(struct sock *sk, | |
255 | struct request_sock *req, | |
c2977c22 | 256 | unsigned long timeout); |
3f421baa ACM |
257 | |
258 | static inline void inet_csk_reqsk_queue_removed(struct sock *sk, | |
259 | struct request_sock *req) | |
260 | { | |
261 | if (reqsk_queue_removed(&inet_csk(sk)->icsk_accept_queue, req) == 0) | |
262 | inet_csk_delete_keepalive_timer(sk); | |
263 | } | |
264 | ||
265 | static inline void inet_csk_reqsk_queue_added(struct sock *sk, | |
266 | const unsigned long timeout) | |
267 | { | |
268 | if (reqsk_queue_added(&inet_csk(sk)->icsk_accept_queue) == 0) | |
269 | inet_csk_reset_keepalive_timer(sk, timeout); | |
270 | } | |
271 | ||
272 | static inline int inet_csk_reqsk_queue_len(const struct sock *sk) | |
273 | { | |
274 | return reqsk_queue_len(&inet_csk(sk)->icsk_accept_queue); | |
275 | } | |
276 | ||
277 | static inline int inet_csk_reqsk_queue_young(const struct sock *sk) | |
278 | { | |
279 | return reqsk_queue_len_young(&inet_csk(sk)->icsk_accept_queue); | |
280 | } | |
281 | ||
282 | static inline int inet_csk_reqsk_queue_is_full(const struct sock *sk) | |
283 | { | |
284 | return reqsk_queue_is_full(&inet_csk(sk)->icsk_accept_queue); | |
285 | } | |
286 | ||
287 | static inline void inet_csk_reqsk_queue_unlink(struct sock *sk, | |
288 | struct request_sock *req, | |
289 | struct request_sock **prev) | |
290 | { | |
291 | reqsk_queue_unlink(&inet_csk(sk)->icsk_accept_queue, req, prev); | |
292 | } | |
293 | ||
294 | static inline void inet_csk_reqsk_queue_drop(struct sock *sk, | |
295 | struct request_sock *req, | |
296 | struct request_sock **prev) | |
297 | { | |
298 | inet_csk_reqsk_queue_unlink(sk, req, prev); | |
299 | inet_csk_reqsk_queue_removed(sk, req); | |
300 | reqsk_free(req); | |
301 | } | |
302 | ||
a019d6fe ACM |
303 | extern void inet_csk_reqsk_queue_prune(struct sock *parent, |
304 | const unsigned long interval, | |
305 | const unsigned long timeout, | |
306 | const unsigned long max_rto); | |
307 | ||
308 | extern void inet_csk_destroy_sock(struct sock *sk); | |
dc40c7bc ACM |
309 | |
310 | /* | |
311 | * LISTEN is a special case for poll.. | |
312 | */ | |
313 | static inline unsigned int inet_csk_listen_poll(const struct sock *sk) | |
314 | { | |
315 | return !reqsk_queue_empty(&inet_csk(sk)->icsk_accept_queue) ? | |
316 | (POLLIN | POLLRDNORM) : 0; | |
317 | } | |
318 | ||
a019d6fe | 319 | extern int inet_csk_listen_start(struct sock *sk, const int nr_table_entries); |
295f7324 ACM |
320 | extern void inet_csk_listen_stop(struct sock *sk); |
321 | ||
af05dc93 ACM |
322 | extern void inet_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr); |
323 | ||
c4d93909 ACM |
324 | extern int inet_csk_ctl_sock_create(struct socket **sock, |
325 | unsigned short family, | |
326 | unsigned short type, | |
327 | unsigned char protocol); | |
463c84b9 | 328 | #endif /* _INET_CONNECTION_SOCK_H */ |