Merge branch 'dbg-early-merge' of git://git.kernel.org/pub/scm/linux/kernel/git/jwess...
[sfrench/cifs-2.6.git] / include / net / inet_connection_sock.h
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);
40         void        (*send_check)(struct sock *sk, struct sk_buff *skb);
41         int         (*rebuild_header)(struct sock *sk);
42         int         (*conn_request)(struct sock *sk, struct sk_buff *skb);
43         struct sock *(*syn_recv_sock)(struct sock *sk, struct sk_buff *skb,
44                                       struct request_sock *req,
45                                       struct dst_entry *dst);
46         int         (*remember_stamp)(struct sock *sk);
47         u16         net_header_len;
48         u16         sockaddr_len;
49         int         (*setsockopt)(struct sock *sk, int level, int optname, 
50                                   char __user *optval, unsigned int optlen);
51         int         (*getsockopt)(struct sock *sk, int level, int optname, 
52                                   char __user *optval, int __user *optlen);
53 #ifdef CONFIG_COMPAT
54         int         (*compat_setsockopt)(struct sock *sk,
55                                 int level, int optname,
56                                 char __user *optval, unsigned int optlen);
57         int         (*compat_getsockopt)(struct sock *sk,
58                                 int level, int optname,
59                                 char __user *optval, int __user *optlen);
60 #endif
61         void        (*addr2sockaddr)(struct sock *sk, struct sockaddr *);
62         int         (*bind_conflict)(const struct sock *sk,
63                                      const struct inet_bind_bucket *tb);
64 };
65
66 /** inet_connection_sock - INET connection oriented sock
67  *
68  * @icsk_accept_queue:     FIFO of established children 
69  * @icsk_bind_hash:        Bind node
70  * @icsk_timeout:          Timeout
71  * @icsk_retransmit_timer: Resend (no ack)
72  * @icsk_rto:              Retransmit timeout
73  * @icsk_pmtu_cookie       Last pmtu seen by socket
74  * @icsk_ca_ops            Pluggable congestion control hook
75  * @icsk_af_ops            Operations which are AF_INET{4,6} specific
76  * @icsk_ca_state:         Congestion control state
77  * @icsk_retransmits:      Number of unrecovered [RTO] timeouts
78  * @icsk_pending:          Scheduled timer event
79  * @icsk_backoff:          Backoff
80  * @icsk_syn_retries:      Number of allowed SYN (or equivalent) retries
81  * @icsk_probes_out:       unanswered 0 window probes
82  * @icsk_ext_hdr_len:      Network protocol overhead (IP/IPv6 options)
83  * @icsk_ack:              Delayed ACK control data
84  * @icsk_mtup;             MTU probing control data
85  */
86 struct inet_connection_sock {
87         /* inet_sock has to be the first member! */
88         struct inet_sock          icsk_inet;
89         struct request_sock_queue icsk_accept_queue;
90         struct inet_bind_bucket   *icsk_bind_hash;
91         unsigned long             icsk_timeout;
92         struct timer_list         icsk_retransmit_timer;
93         struct timer_list         icsk_delack_timer;
94         __u32                     icsk_rto;
95         __u32                     icsk_pmtu_cookie;
96         const struct tcp_congestion_ops *icsk_ca_ops;
97         const struct inet_connection_sock_af_ops *icsk_af_ops;
98         unsigned int              (*icsk_sync_mss)(struct sock *sk, u32 pmtu);
99         __u8                      icsk_ca_state;
100         __u8                      icsk_retransmits;
101         __u8                      icsk_pending;
102         __u8                      icsk_backoff;
103         __u8                      icsk_syn_retries;
104         __u8                      icsk_probes_out;
105         __u16                     icsk_ext_hdr_len;
106         struct {
107                 __u8              pending;       /* ACK is pending                         */
108                 __u8              quick;         /* Scheduled number of quick acks         */
109                 __u8              pingpong;      /* The session is interactive             */
110                 __u8              blocked;       /* Delayed ACK was blocked by socket lock */
111                 __u32             ato;           /* Predicted tick of soft clock           */
112                 unsigned long     timeout;       /* Currently scheduled timeout            */
113                 __u32             lrcvtime;      /* timestamp of last received data packet */
114                 __u16             last_seg_size; /* Size of last incoming segment          */
115                 __u16             rcv_mss;       /* MSS used for delayed ACK decisions     */ 
116         } icsk_ack;
117         struct {
118                 int               enabled;
119
120                 /* Range of MTUs to search */
121                 int               search_high;
122                 int               search_low;
123
124                 /* Information on the current probe. */
125                 int               probe_size;
126         } icsk_mtup;
127         u32                       icsk_ca_priv[16];
128 #define ICSK_CA_PRIV_SIZE       (16 * sizeof(u32))
129 };
130
131 #define ICSK_TIME_RETRANS       1       /* Retransmit timer */
132 #define ICSK_TIME_DACK          2       /* Delayed ack timer */
133 #define ICSK_TIME_PROBE0        3       /* Zero window probe timer */
134 #define ICSK_TIME_KEEPOPEN      4       /* Keepalive timer */
135
136 static inline struct inet_connection_sock *inet_csk(const struct sock *sk)
137 {
138         return (struct inet_connection_sock *)sk;
139 }
140
141 static inline void *inet_csk_ca(const struct sock *sk)
142 {
143         return (void *)inet_csk(sk)->icsk_ca_priv;
144 }
145
146 extern struct sock *inet_csk_clone(struct sock *sk,
147                                    const struct request_sock *req,
148                                    const gfp_t priority);
149
150 enum inet_csk_ack_state_t {
151         ICSK_ACK_SCHED  = 1,
152         ICSK_ACK_TIMER  = 2,
153         ICSK_ACK_PUSHED = 4,
154         ICSK_ACK_PUSHED2 = 8
155 };
156
157 extern void inet_csk_init_xmit_timers(struct sock *sk,
158                                       void (*retransmit_handler)(unsigned long),
159                                       void (*delack_handler)(unsigned long),
160                                       void (*keepalive_handler)(unsigned long));
161 extern void inet_csk_clear_xmit_timers(struct sock *sk);
162
163 static inline void inet_csk_schedule_ack(struct sock *sk)
164 {
165         inet_csk(sk)->icsk_ack.pending |= ICSK_ACK_SCHED;
166 }
167
168 static inline int inet_csk_ack_scheduled(const struct sock *sk)
169 {
170         return inet_csk(sk)->icsk_ack.pending & ICSK_ACK_SCHED;
171 }
172
173 static inline void inet_csk_delack_init(struct sock *sk)
174 {
175         memset(&inet_csk(sk)->icsk_ack, 0, sizeof(inet_csk(sk)->icsk_ack));
176 }
177
178 extern void inet_csk_delete_keepalive_timer(struct sock *sk);
179 extern void inet_csk_reset_keepalive_timer(struct sock *sk, unsigned long timeout);
180
181 #ifdef INET_CSK_DEBUG
182 extern const char inet_csk_timer_bug_msg[];
183 #endif
184
185 static inline void inet_csk_clear_xmit_timer(struct sock *sk, const int what)
186 {
187         struct inet_connection_sock *icsk = inet_csk(sk);
188         
189         if (what == ICSK_TIME_RETRANS || what == ICSK_TIME_PROBE0) {
190                 icsk->icsk_pending = 0;
191 #ifdef INET_CSK_CLEAR_TIMERS
192                 sk_stop_timer(sk, &icsk->icsk_retransmit_timer);
193 #endif
194         } else if (what == ICSK_TIME_DACK) {
195                 icsk->icsk_ack.blocked = icsk->icsk_ack.pending = 0;
196 #ifdef INET_CSK_CLEAR_TIMERS
197                 sk_stop_timer(sk, &icsk->icsk_delack_timer);
198 #endif
199         }
200 #ifdef INET_CSK_DEBUG
201         else {
202                 pr_debug("%s", inet_csk_timer_bug_msg);
203         }
204 #endif
205 }
206
207 /*
208  *      Reset the retransmission timer
209  */
210 static inline void inet_csk_reset_xmit_timer(struct sock *sk, const int what,
211                                              unsigned long when,
212                                              const unsigned long max_when)
213 {
214         struct inet_connection_sock *icsk = inet_csk(sk);
215
216         if (when > max_when) {
217 #ifdef INET_CSK_DEBUG
218                 pr_debug("reset_xmit_timer: sk=%p %d when=0x%lx, caller=%p\n",
219                          sk, what, when, current_text_addr());
220 #endif
221                 when = max_when;
222         }
223
224         if (what == ICSK_TIME_RETRANS || what == ICSK_TIME_PROBE0) {
225                 icsk->icsk_pending = what;
226                 icsk->icsk_timeout = jiffies + when;
227                 sk_reset_timer(sk, &icsk->icsk_retransmit_timer, icsk->icsk_timeout);
228         } else if (what == ICSK_TIME_DACK) {
229                 icsk->icsk_ack.pending |= ICSK_ACK_TIMER;
230                 icsk->icsk_ack.timeout = jiffies + when;
231                 sk_reset_timer(sk, &icsk->icsk_delack_timer, icsk->icsk_ack.timeout);
232         }
233 #ifdef INET_CSK_DEBUG
234         else {
235                 pr_debug("%s", inet_csk_timer_bug_msg);
236         }
237 #endif
238 }
239
240 extern struct sock *inet_csk_accept(struct sock *sk, int flags, int *err);
241
242 extern struct request_sock *inet_csk_search_req(const struct sock *sk,
243                                                 struct request_sock ***prevp,
244                                                 const __be16 rport,
245                                                 const __be32 raddr,
246                                                 const __be32 laddr);
247 extern int inet_csk_bind_conflict(const struct sock *sk,
248                                   const struct inet_bind_bucket *tb);
249 extern int inet_csk_get_port(struct sock *sk, unsigned short snum);
250
251 extern struct dst_entry* inet_csk_route_req(struct sock *sk,
252                                             const struct request_sock *req);
253
254 static inline void inet_csk_reqsk_queue_add(struct sock *sk,
255                                             struct request_sock *req,
256                                             struct sock *child)
257 {
258         reqsk_queue_add(&inet_csk(sk)->icsk_accept_queue, req, sk, child);
259 }
260
261 extern void inet_csk_reqsk_queue_hash_add(struct sock *sk,
262                                           struct request_sock *req,
263                                           unsigned long timeout);
264
265 static inline void inet_csk_reqsk_queue_removed(struct sock *sk,
266                                                 struct request_sock *req)
267 {
268         if (reqsk_queue_removed(&inet_csk(sk)->icsk_accept_queue, req) == 0)
269                 inet_csk_delete_keepalive_timer(sk);
270 }
271
272 static inline void inet_csk_reqsk_queue_added(struct sock *sk,
273                                               const unsigned long timeout)
274 {
275         if (reqsk_queue_added(&inet_csk(sk)->icsk_accept_queue) == 0)
276                 inet_csk_reset_keepalive_timer(sk, timeout);
277 }
278
279 static inline int inet_csk_reqsk_queue_len(const struct sock *sk)
280 {
281         return reqsk_queue_len(&inet_csk(sk)->icsk_accept_queue);
282 }
283
284 static inline int inet_csk_reqsk_queue_young(const struct sock *sk)
285 {
286         return reqsk_queue_len_young(&inet_csk(sk)->icsk_accept_queue);
287 }
288
289 static inline int inet_csk_reqsk_queue_is_full(const struct sock *sk)
290 {
291         return reqsk_queue_is_full(&inet_csk(sk)->icsk_accept_queue);
292 }
293
294 static inline void inet_csk_reqsk_queue_unlink(struct sock *sk,
295                                                struct request_sock *req,
296                                                struct request_sock **prev)
297 {
298         reqsk_queue_unlink(&inet_csk(sk)->icsk_accept_queue, req, prev);
299 }
300
301 static inline void inet_csk_reqsk_queue_drop(struct sock *sk,
302                                              struct request_sock *req,
303                                              struct request_sock **prev)
304 {
305         inet_csk_reqsk_queue_unlink(sk, req, prev);
306         inet_csk_reqsk_queue_removed(sk, req);
307         reqsk_free(req);
308 }
309
310 extern void inet_csk_reqsk_queue_prune(struct sock *parent,
311                                        const unsigned long interval,
312                                        const unsigned long timeout,
313                                        const unsigned long max_rto);
314
315 extern void inet_csk_destroy_sock(struct sock *sk);
316
317 /*
318  * LISTEN is a special case for poll..
319  */
320 static inline unsigned int inet_csk_listen_poll(const struct sock *sk)
321 {
322         return !reqsk_queue_empty(&inet_csk(sk)->icsk_accept_queue) ?
323                         (POLLIN | POLLRDNORM) : 0;
324 }
325
326 extern int  inet_csk_listen_start(struct sock *sk, const int nr_table_entries);
327 extern void inet_csk_listen_stop(struct sock *sk);
328
329 extern void inet_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr);
330
331 extern int inet_csk_compat_getsockopt(struct sock *sk, int level, int optname,
332                                       char __user *optval, int __user *optlen);
333 extern int inet_csk_compat_setsockopt(struct sock *sk, int level, int optname,
334                                       char __user *optval, unsigned int optlen);
335 #endif /* _INET_CONNECTION_SOCK_H */