Root/
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/compiler.h> |
19 | #include <linux/string.h> |
20 | #include <linux/timer.h> |
21 | #include <linux/poll.h> |
22 | |
23 | #include <net/inet_sock.h> |
24 | #include <net/request_sock.h> |
25 | |
26 | #define INET_CSK_DEBUG 1 |
27 | |
28 | /* Cancel timers, when they are not required. */ |
29 | #undef INET_CSK_CLEAR_TIMERS |
30 | |
31 | struct inet_bind_bucket; |
32 | struct tcp_congestion_ops; |
33 | |
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, struct flowi *fl); |
40 | void (*send_check)(struct sock *sk, struct sk_buff *skb); |
41 | int (*rebuild_header)(struct sock *sk); |
42 | void (*sk_rx_dst_set)(struct sock *sk, const struct sk_buff *skb); |
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 | u16 net_header_len; |
48 | u16 net_frag_header_len; |
49 | u16 sockaddr_len; |
50 | int (*setsockopt)(struct sock *sk, int level, int optname, |
51 | char __user *optval, unsigned int optlen); |
52 | int (*getsockopt)(struct sock *sk, int level, int optname, |
53 | char __user *optval, int __user *optlen); |
54 | #ifdef CONFIG_COMPAT |
55 | int (*compat_setsockopt)(struct sock *sk, |
56 | int level, int optname, |
57 | char __user *optval, unsigned int optlen); |
58 | int (*compat_getsockopt)(struct sock *sk, |
59 | int level, int optname, |
60 | char __user *optval, int __user *optlen); |
61 | #endif |
62 | void (*addr2sockaddr)(struct sock *sk, struct sockaddr *); |
63 | int (*bind_conflict)(const struct sock *sk, |
64 | const struct inet_bind_bucket *tb, bool relax); |
65 | }; |
66 | |
67 | /** inet_connection_sock - INET connection oriented sock |
68 | * |
69 | * @icsk_accept_queue: FIFO of established children |
70 | * @icsk_bind_hash: Bind node |
71 | * @icsk_timeout: Timeout |
72 | * @icsk_retransmit_timer: Resend (no ack) |
73 | * @icsk_rto: Retransmit timeout |
74 | * @icsk_pmtu_cookie Last pmtu seen by socket |
75 | * @icsk_ca_ops Pluggable congestion control hook |
76 | * @icsk_af_ops Operations which are AF_INET{4,6} specific |
77 | * @icsk_ca_state: Congestion control state |
78 | * @icsk_retransmits: Number of unrecovered [RTO] timeouts |
79 | * @icsk_pending: Scheduled timer event |
80 | * @icsk_backoff: Backoff |
81 | * @icsk_syn_retries: Number of allowed SYN (or equivalent) retries |
82 | * @icsk_probes_out: unanswered 0 window probes |
83 | * @icsk_ext_hdr_len: Network protocol overhead (IP/IPv6 options) |
84 | * @icsk_ack: Delayed ACK control data |
85 | * @icsk_mtup; MTU probing control data |
86 | */ |
87 | struct inet_connection_sock { |
88 | /* inet_sock has to be the first member! */ |
89 | struct inet_sock icsk_inet; |
90 | struct request_sock_queue icsk_accept_queue; |
91 | struct inet_bind_bucket *icsk_bind_hash; |
92 | unsigned long icsk_timeout; |
93 | struct timer_list icsk_retransmit_timer; |
94 | struct timer_list icsk_delack_timer; |
95 | __u32 icsk_rto; |
96 | __u32 icsk_pmtu_cookie; |
97 | const struct tcp_congestion_ops *icsk_ca_ops; |
98 | const struct inet_connection_sock_af_ops *icsk_af_ops; |
99 | unsigned int (*icsk_sync_mss)(struct sock *sk, u32 pmtu); |
100 | __u8 icsk_ca_state; |
101 | __u8 icsk_retransmits; |
102 | __u8 icsk_pending; |
103 | __u8 icsk_backoff; |
104 | __u8 icsk_syn_retries; |
105 | __u8 icsk_probes_out; |
106 | __u16 icsk_ext_hdr_len; |
107 | struct { |
108 | __u8 pending; /* ACK is pending */ |
109 | __u8 quick; /* Scheduled number of quick acks */ |
110 | __u8 pingpong; /* The session is interactive */ |
111 | __u8 blocked; /* Delayed ACK was blocked by socket lock */ |
112 | __u32 ato; /* Predicted tick of soft clock */ |
113 | unsigned long timeout; /* Currently scheduled timeout */ |
114 | __u32 lrcvtime; /* timestamp of last received data packet */ |
115 | __u16 last_seg_size; /* Size of last incoming segment */ |
116 | __u16 rcv_mss; /* MSS used for delayed ACK decisions */ |
117 | } icsk_ack; |
118 | struct { |
119 | int enabled; |
120 | |
121 | /* Range of MTUs to search */ |
122 | int search_high; |
123 | int search_low; |
124 | |
125 | /* Information on the current probe. */ |
126 | int probe_size; |
127 | } icsk_mtup; |
128 | u32 icsk_ca_priv[16]; |
129 | u32 icsk_user_timeout; |
130 | #define ICSK_CA_PRIV_SIZE (16 * sizeof(u32)) |
131 | }; |
132 | |
133 | #define ICSK_TIME_RETRANS 1 /* Retransmit timer */ |
134 | #define ICSK_TIME_DACK 2 /* Delayed ack timer */ |
135 | #define ICSK_TIME_PROBE0 3 /* Zero window probe timer */ |
136 | #define ICSK_TIME_EARLY_RETRANS 4 /* Early retransmit timer */ |
137 | #define ICSK_TIME_LOSS_PROBE 5 /* Tail loss probe timer */ |
138 | |
139 | static inline struct inet_connection_sock *inet_csk(const struct sock *sk) |
140 | { |
141 | return (struct inet_connection_sock *)sk; |
142 | } |
143 | |
144 | static inline void *inet_csk_ca(const struct sock *sk) |
145 | { |
146 | return (void *)inet_csk(sk)->icsk_ca_priv; |
147 | } |
148 | |
149 | extern struct sock *inet_csk_clone_lock(const struct sock *sk, |
150 | const struct request_sock *req, |
151 | const gfp_t priority); |
152 | |
153 | enum inet_csk_ack_state_t { |
154 | ICSK_ACK_SCHED = 1, |
155 | ICSK_ACK_TIMER = 2, |
156 | ICSK_ACK_PUSHED = 4, |
157 | ICSK_ACK_PUSHED2 = 8 |
158 | }; |
159 | |
160 | extern void inet_csk_init_xmit_timers(struct sock *sk, |
161 | void (*retransmit_handler)(unsigned long), |
162 | void (*delack_handler)(unsigned long), |
163 | void (*keepalive_handler)(unsigned long)); |
164 | extern void inet_csk_clear_xmit_timers(struct sock *sk); |
165 | |
166 | static inline void inet_csk_schedule_ack(struct sock *sk) |
167 | { |
168 | inet_csk(sk)->icsk_ack.pending |= ICSK_ACK_SCHED; |
169 | } |
170 | |
171 | static inline int inet_csk_ack_scheduled(const struct sock *sk) |
172 | { |
173 | return inet_csk(sk)->icsk_ack.pending & ICSK_ACK_SCHED; |
174 | } |
175 | |
176 | static inline void inet_csk_delack_init(struct sock *sk) |
177 | { |
178 | memset(&inet_csk(sk)->icsk_ack, 0, sizeof(inet_csk(sk)->icsk_ack)); |
179 | } |
180 | |
181 | extern void inet_csk_delete_keepalive_timer(struct sock *sk); |
182 | extern void inet_csk_reset_keepalive_timer(struct sock *sk, unsigned long timeout); |
183 | |
184 | #ifdef INET_CSK_DEBUG |
185 | extern const char inet_csk_timer_bug_msg[]; |
186 | #endif |
187 | |
188 | static inline void inet_csk_clear_xmit_timer(struct sock *sk, const int what) |
189 | { |
190 | struct inet_connection_sock *icsk = inet_csk(sk); |
191 | |
192 | if (what == ICSK_TIME_RETRANS || what == ICSK_TIME_PROBE0) { |
193 | icsk->icsk_pending = 0; |
194 | #ifdef INET_CSK_CLEAR_TIMERS |
195 | sk_stop_timer(sk, &icsk->icsk_retransmit_timer); |
196 | #endif |
197 | } else if (what == ICSK_TIME_DACK) { |
198 | icsk->icsk_ack.blocked = icsk->icsk_ack.pending = 0; |
199 | #ifdef INET_CSK_CLEAR_TIMERS |
200 | sk_stop_timer(sk, &icsk->icsk_delack_timer); |
201 | #endif |
202 | } |
203 | #ifdef INET_CSK_DEBUG |
204 | else { |
205 | pr_debug("%s", inet_csk_timer_bug_msg); |
206 | } |
207 | #endif |
208 | } |
209 | |
210 | /* |
211 | * Reset the retransmission timer |
212 | */ |
213 | static inline void inet_csk_reset_xmit_timer(struct sock *sk, const int what, |
214 | unsigned long when, |
215 | const unsigned long max_when) |
216 | { |
217 | struct inet_connection_sock *icsk = inet_csk(sk); |
218 | |
219 | if (when > max_when) { |
220 | #ifdef INET_CSK_DEBUG |
221 | pr_debug("reset_xmit_timer: sk=%p %d when=0x%lx, caller=%p\n", |
222 | sk, what, when, current_text_addr()); |
223 | #endif |
224 | when = max_when; |
225 | } |
226 | |
227 | if (what == ICSK_TIME_RETRANS || what == ICSK_TIME_PROBE0 || |
228 | what == ICSK_TIME_EARLY_RETRANS || what == ICSK_TIME_LOSS_PROBE) { |
229 | icsk->icsk_pending = what; |
230 | icsk->icsk_timeout = jiffies + when; |
231 | sk_reset_timer(sk, &icsk->icsk_retransmit_timer, icsk->icsk_timeout); |
232 | } else if (what == ICSK_TIME_DACK) { |
233 | icsk->icsk_ack.pending |= ICSK_ACK_TIMER; |
234 | icsk->icsk_ack.timeout = jiffies + when; |
235 | sk_reset_timer(sk, &icsk->icsk_delack_timer, icsk->icsk_ack.timeout); |
236 | } |
237 | #ifdef INET_CSK_DEBUG |
238 | else { |
239 | pr_debug("%s", inet_csk_timer_bug_msg); |
240 | } |
241 | #endif |
242 | } |
243 | |
244 | extern struct sock *inet_csk_accept(struct sock *sk, int flags, int *err); |
245 | |
246 | extern struct request_sock *inet_csk_search_req(const struct sock *sk, |
247 | struct request_sock ***prevp, |
248 | const __be16 rport, |
249 | const __be32 raddr, |
250 | const __be32 laddr); |
251 | extern int inet_csk_bind_conflict(const struct sock *sk, |
252 | const struct inet_bind_bucket *tb, bool relax); |
253 | extern int inet_csk_get_port(struct sock *sk, unsigned short snum); |
254 | |
255 | extern struct dst_entry* inet_csk_route_req(struct sock *sk, |
256 | struct flowi4 *fl4, |
257 | const struct request_sock *req); |
258 | extern struct dst_entry* inet_csk_route_child_sock(struct sock *sk, |
259 | struct sock *newsk, |
260 | const struct request_sock *req); |
261 | |
262 | static inline void inet_csk_reqsk_queue_add(struct sock *sk, |
263 | struct request_sock *req, |
264 | struct sock *child) |
265 | { |
266 | reqsk_queue_add(&inet_csk(sk)->icsk_accept_queue, req, sk, child); |
267 | } |
268 | |
269 | extern void inet_csk_reqsk_queue_hash_add(struct sock *sk, |
270 | struct request_sock *req, |
271 | unsigned long timeout); |
272 | |
273 | static inline void inet_csk_reqsk_queue_removed(struct sock *sk, |
274 | struct request_sock *req) |
275 | { |
276 | if (reqsk_queue_removed(&inet_csk(sk)->icsk_accept_queue, req) == 0) |
277 | inet_csk_delete_keepalive_timer(sk); |
278 | } |
279 | |
280 | static inline void inet_csk_reqsk_queue_added(struct sock *sk, |
281 | const unsigned long timeout) |
282 | { |
283 | if (reqsk_queue_added(&inet_csk(sk)->icsk_accept_queue) == 0) |
284 | inet_csk_reset_keepalive_timer(sk, timeout); |
285 | } |
286 | |
287 | static inline int inet_csk_reqsk_queue_len(const struct sock *sk) |
288 | { |
289 | return reqsk_queue_len(&inet_csk(sk)->icsk_accept_queue); |
290 | } |
291 | |
292 | static inline int inet_csk_reqsk_queue_young(const struct sock *sk) |
293 | { |
294 | return reqsk_queue_len_young(&inet_csk(sk)->icsk_accept_queue); |
295 | } |
296 | |
297 | static inline int inet_csk_reqsk_queue_is_full(const struct sock *sk) |
298 | { |
299 | return reqsk_queue_is_full(&inet_csk(sk)->icsk_accept_queue); |
300 | } |
301 | |
302 | static inline void inet_csk_reqsk_queue_unlink(struct sock *sk, |
303 | struct request_sock *req, |
304 | struct request_sock **prev) |
305 | { |
306 | reqsk_queue_unlink(&inet_csk(sk)->icsk_accept_queue, req, prev); |
307 | } |
308 | |
309 | static inline void inet_csk_reqsk_queue_drop(struct sock *sk, |
310 | struct request_sock *req, |
311 | struct request_sock **prev) |
312 | { |
313 | inet_csk_reqsk_queue_unlink(sk, req, prev); |
314 | inet_csk_reqsk_queue_removed(sk, req); |
315 | reqsk_free(req); |
316 | } |
317 | |
318 | extern void inet_csk_reqsk_queue_prune(struct sock *parent, |
319 | const unsigned long interval, |
320 | const unsigned long timeout, |
321 | const unsigned long max_rto); |
322 | |
323 | extern void inet_csk_destroy_sock(struct sock *sk); |
324 | extern void inet_csk_prepare_forced_close(struct sock *sk); |
325 | |
326 | /* |
327 | * LISTEN is a special case for poll.. |
328 | */ |
329 | static inline unsigned int inet_csk_listen_poll(const struct sock *sk) |
330 | { |
331 | return !reqsk_queue_empty(&inet_csk(sk)->icsk_accept_queue) ? |
332 | (POLLIN | POLLRDNORM) : 0; |
333 | } |
334 | |
335 | extern int inet_csk_listen_start(struct sock *sk, const int nr_table_entries); |
336 | extern void inet_csk_listen_stop(struct sock *sk); |
337 | |
338 | extern void inet_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr); |
339 | |
340 | extern int inet_csk_compat_getsockopt(struct sock *sk, int level, int optname, |
341 | char __user *optval, int __user *optlen); |
342 | extern int inet_csk_compat_setsockopt(struct sock *sk, int level, int optname, |
343 | char __user *optval, unsigned int optlen); |
344 | |
345 | extern struct dst_entry *inet_csk_update_pmtu(struct sock *sk, u32 mtu); |
346 | #endif /* _INET_CONNECTION_SOCK_H */ |
347 |
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