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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> |
bd01f843 | 21 | #include <linux/poll.h> |
14c85021 ACM |
22 | |
23 | #include <net/inet_sock.h> | |
463c84b9 ACM |
24 | #include <net/request_sock.h> |
25 | ||
3f421baa ACM |
26 | #define INET_CSK_DEBUG 1 |
27 | ||
28 | /* Cancel timers, when they are not required. */ | |
29 | #undef INET_CSK_CLEAR_TIMERS | |
30 | ||
463c84b9 ACM |
31 | struct inet_bind_bucket; |
32 | struct inet_hashinfo; | |
6687e988 | 33 | struct tcp_congestion_ops; |
463c84b9 | 34 | |
8292a17a ACM |
35 | /* |
36 | * Pointers to address related TCP functions | |
37 | * (i.e. things that depend on the address family) | |
38 | */ | |
39 | struct inet_connection_sock_af_ops { | |
93173112 DM |
40 | int (*queue_xmit)(struct sk_buff *skb, struct sock *sk, |
41 | int ipfragok); | |
8292a17a ACM |
42 | void (*send_check)(struct sock *sk, int len, |
43 | struct sk_buff *skb); | |
44 | int (*rebuild_header)(struct sock *sk); | |
45 | int (*conn_request)(struct sock *sk, struct sk_buff *skb); | |
46 | struct sock *(*syn_recv_sock)(struct sock *sk, struct sk_buff *skb, | |
47 | struct request_sock *req, | |
48 | struct dst_entry *dst); | |
49 | int (*remember_stamp)(struct sock *sk); | |
850db6b8 ACM |
50 | u16 net_header_len; |
51 | u16 sockaddr_len; | |
8292a17a ACM |
52 | int (*setsockopt)(struct sock *sk, int level, int optname, |
53 | char __user *optval, int optlen); | |
54 | int (*getsockopt)(struct sock *sk, int level, int optname, | |
55 | char __user *optval, int __user *optlen); | |
3fdadf7d DM |
56 | int (*compat_setsockopt)(struct sock *sk, |
57 | int level, int optname, | |
58 | char __user *optval, int optlen); | |
59 | int (*compat_getsockopt)(struct sock *sk, | |
60 | int level, int optname, | |
61 | char __user *optval, int __user *optlen); | |
8292a17a | 62 | void (*addr2sockaddr)(struct sock *sk, struct sockaddr *); |
8292a17a ACM |
63 | }; |
64 | ||
463c84b9 ACM |
65 | /** 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 | |
d83d8461 | 72 | * @icsk_pmtu_cookie Last pmtu seen by socket |
6687e988 | 73 | * @icsk_ca_ops Pluggable congestion control hook |
8292a17a | 74 | * @icsk_af_ops Operations which are AF_INET{4,6} specific |
6687e988 | 75 | * @icsk_ca_state: Congestion control state |
463c84b9 ACM |
76 | * @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 | |
6687e988 | 80 | * @icsk_probes_out: unanswered 0 window probes |
d83d8461 | 81 | * @icsk_ext_hdr_len: Network protocol overhead (IP/IPv6 options) |
463c84b9 | 82 | * @icsk_ack: Delayed ACK control data |
5d424d5a | 83 | * @icsk_mtup; MTU probing control data |
463c84b9 ACM |
84 | */ |
85 | struct 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; | |
d83d8461 | 94 | __u32 icsk_pmtu_cookie; |
770cfbcf SH |
95 | const struct tcp_congestion_ops *icsk_ca_ops; |
96 | const struct inet_connection_sock_af_ops *icsk_af_ops; | |
d83d8461 | 97 | unsigned int (*icsk_sync_mss)(struct sock *sk, u32 pmtu); |
6687e988 | 98 | __u8 icsk_ca_state; |
463c84b9 ACM |
99 | __u8 icsk_retransmits; |
100 | __u8 icsk_pending; | |
101 | __u8 icsk_backoff; | |
102 | __u8 icsk_syn_retries; | |
6687e988 | 103 | __u8 icsk_probes_out; |
d83d8461 | 104 | __u16 icsk_ext_hdr_len; |
463c84b9 ACM |
105 | 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; | |
5d424d5a JH |
116 | 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; | |
5d424d5a | 125 | } icsk_mtup; |
6687e988 ACM |
126 | u32 icsk_ca_priv[16]; |
127 | #define ICSK_CA_PRIV_SIZE (16 * sizeof(u32)) | |
463c84b9 ACM |
128 | }; |
129 | ||
3f421baa ACM |
130 | #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 | ||
463c84b9 ACM |
135 | static inline struct inet_connection_sock *inet_csk(const struct sock *sk) |
136 | { | |
137 | return (struct inet_connection_sock *)sk; | |
138 | } | |
139 | ||
6687e988 ACM |
140 | static inline void *inet_csk_ca(const struct sock *sk) |
141 | { | |
142 | return (void *)inet_csk(sk)->icsk_ca_priv; | |
143 | } | |
144 | ||
9f1d2604 ACM |
145 | extern struct sock *inet_csk_clone(struct sock *sk, |
146 | const struct request_sock *req, | |
dd0fc66f | 147 | const gfp_t priority); |
9f1d2604 | 148 | |
3f421baa ACM |
149 | enum inet_csk_ack_state_t { |
150 | ICSK_ACK_SCHED = 1, | |
151 | ICSK_ACK_TIMER = 2, | |
1ef9696c AK |
152 | ICSK_ACK_PUSHED = 4, |
153 | ICSK_ACK_PUSHED2 = 8 | |
3f421baa ACM |
154 | }; |
155 | ||
463c84b9 ACM |
156 | extern 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)); | |
160 | extern void inet_csk_clear_xmit_timers(struct sock *sk); | |
161 | ||
3f421baa ACM |
162 | static inline void inet_csk_schedule_ack(struct sock *sk) |
163 | { | |
164 | inet_csk(sk)->icsk_ack.pending |= ICSK_ACK_SCHED; | |
165 | } | |
166 | ||
167 | static inline int inet_csk_ack_scheduled(const struct sock *sk) | |
168 | { | |
169 | return inet_csk(sk)->icsk_ack.pending & ICSK_ACK_SCHED; | |
170 | } | |
171 | ||
172 | static 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 | ||
177 | extern void inet_csk_delete_keepalive_timer(struct sock *sk); | |
178 | extern void inet_csk_reset_keepalive_timer(struct sock *sk, unsigned long timeout); | |
179 | ||
180 | #ifdef INET_CSK_DEBUG | |
181 | extern const char inet_csk_timer_bug_msg[]; | |
182 | #endif | |
183 | ||
184 | static 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 { | |
d8971fcb | 201 | pr_debug("%s", inet_csk_timer_bug_msg); |
3f421baa ACM |
202 | } |
203 | #endif | |
204 | } | |
205 | ||
206 | /* | |
207 | * Reset the retransmission timer | |
208 | */ | |
209 | static 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 { | |
d8971fcb | 234 | pr_debug("%s", inet_csk_timer_bug_msg); |
3f421baa ACM |
235 | } |
236 | #endif | |
237 | } | |
238 | ||
239 | extern struct sock *inet_csk_accept(struct sock *sk, int flags, int *err); | |
240 | ||
463c84b9 ACM |
241 | extern struct request_sock *inet_csk_search_req(const struct sock *sk, |
242 | struct request_sock ***prevp, | |
6b72977b | 243 | const __be16 rport, |
7f25afbb AV |
244 | const __be32 raddr, |
245 | const __be32 laddr); | |
971af18b ACM |
246 | extern int inet_csk_bind_conflict(const struct sock *sk, |
247 | const struct inet_bind_bucket *tb); | |
463c84b9 | 248 | extern int inet_csk_get_port(struct inet_hashinfo *hashinfo, |
971af18b ACM |
249 | struct sock *sk, unsigned short snum, |
250 | int (*bind_conflict)(const struct sock *sk, | |
251 | const struct inet_bind_bucket *tb)); | |
463c84b9 ACM |
252 | |
253 | extern struct dst_entry* inet_csk_route_req(struct sock *sk, | |
254 | const struct request_sock *req); | |
255 | ||
3f421baa ACM |
256 | static inline void inet_csk_reqsk_queue_add(struct sock *sk, |
257 | struct request_sock *req, | |
258 | struct sock *child) | |
259 | { | |
260 | reqsk_queue_add(&inet_csk(sk)->icsk_accept_queue, req, sk, child); | |
261 | } | |
262 | ||
263 | extern void inet_csk_reqsk_queue_hash_add(struct sock *sk, | |
264 | struct request_sock *req, | |
c2977c22 | 265 | unsigned long timeout); |
3f421baa ACM |
266 | |
267 | static inline void inet_csk_reqsk_queue_removed(struct sock *sk, | |
268 | struct request_sock *req) | |
269 | { | |
270 | if (reqsk_queue_removed(&inet_csk(sk)->icsk_accept_queue, req) == 0) | |
271 | inet_csk_delete_keepalive_timer(sk); | |
272 | } | |
273 | ||
274 | static inline void inet_csk_reqsk_queue_added(struct sock *sk, | |
275 | const unsigned long timeout) | |
276 | { | |
277 | if (reqsk_queue_added(&inet_csk(sk)->icsk_accept_queue) == 0) | |
278 | inet_csk_reset_keepalive_timer(sk, timeout); | |
279 | } | |
280 | ||
281 | static inline int inet_csk_reqsk_queue_len(const struct sock *sk) | |
282 | { | |
283 | return reqsk_queue_len(&inet_csk(sk)->icsk_accept_queue); | |
284 | } | |
285 | ||
286 | static inline int inet_csk_reqsk_queue_young(const struct sock *sk) | |
287 | { | |
288 | return reqsk_queue_len_young(&inet_csk(sk)->icsk_accept_queue); | |
289 | } | |
290 | ||
291 | static inline int inet_csk_reqsk_queue_is_full(const struct sock *sk) | |
292 | { | |
293 | return reqsk_queue_is_full(&inet_csk(sk)->icsk_accept_queue); | |
294 | } | |
295 | ||
296 | static inline void inet_csk_reqsk_queue_unlink(struct sock *sk, | |
297 | struct request_sock *req, | |
298 | struct request_sock **prev) | |
299 | { | |
300 | reqsk_queue_unlink(&inet_csk(sk)->icsk_accept_queue, req, prev); | |
301 | } | |
302 | ||
303 | static inline void inet_csk_reqsk_queue_drop(struct sock *sk, | |
304 | struct request_sock *req, | |
305 | struct request_sock **prev) | |
306 | { | |
307 | inet_csk_reqsk_queue_unlink(sk, req, prev); | |
308 | inet_csk_reqsk_queue_removed(sk, req); | |
309 | reqsk_free(req); | |
310 | } | |
311 | ||
a019d6fe ACM |
312 | extern void inet_csk_reqsk_queue_prune(struct sock *parent, |
313 | const unsigned long interval, | |
314 | const unsigned long timeout, | |
315 | const unsigned long max_rto); | |
316 | ||
317 | extern void inet_csk_destroy_sock(struct sock *sk); | |
dc40c7bc ACM |
318 | |
319 | /* | |
320 | * LISTEN is a special case for poll.. | |
321 | */ | |
322 | static inline unsigned int inet_csk_listen_poll(const struct sock *sk) | |
323 | { | |
324 | return !reqsk_queue_empty(&inet_csk(sk)->icsk_accept_queue) ? | |
325 | (POLLIN | POLLRDNORM) : 0; | |
326 | } | |
327 | ||
a019d6fe | 328 | extern int inet_csk_listen_start(struct sock *sk, const int nr_table_entries); |
295f7324 ACM |
329 | extern void inet_csk_listen_stop(struct sock *sk); |
330 | ||
af05dc93 ACM |
331 | extern void inet_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr); |
332 | ||
c4d93909 ACM |
333 | extern int inet_csk_ctl_sock_create(struct socket **sock, |
334 | unsigned short family, | |
335 | unsigned short type, | |
336 | unsigned char protocol); | |
dec73ff0 ACM |
337 | |
338 | extern int inet_csk_compat_getsockopt(struct sock *sk, int level, int optname, | |
339 | char __user *optval, int __user *optlen); | |
340 | extern int inet_csk_compat_setsockopt(struct sock *sk, int level, int optname, | |
341 | char __user *optval, int optlen); | |
463c84b9 | 342 | #endif /* _INET_CONNECTION_SOCK_H */ |