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Linux/include/net/inet_connection_sock.h

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  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 sock *sk, 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)(const struct sock *sk, struct sk_buff *skb,
 45                                       struct request_sock *req,
 46                                       struct dst_entry *dst,
 47                                       struct request_sock *req_unhash,
 48                                       bool *own_req);
 49         u16         net_header_len;
 50         u16         net_frag_header_len;
 51         u16         sockaddr_len;
 52         int         (*setsockopt)(struct sock *sk, int level, int optname, 
 53                                   char __user *optval, unsigned int optlen);
 54         int         (*getsockopt)(struct sock *sk, int level, int optname, 
 55                                   char __user *optval, int __user *optlen);
 56 #ifdef CONFIG_COMPAT
 57         int         (*compat_setsockopt)(struct sock *sk,
 58                                 int level, int optname,
 59                                 char __user *optval, unsigned int optlen);
 60         int         (*compat_getsockopt)(struct sock *sk,
 61                                 int level, int optname,
 62                                 char __user *optval, int __user *optlen);
 63 #endif
 64         void        (*addr2sockaddr)(struct sock *sk, struct sockaddr *);
 65         int         (*bind_conflict)(const struct sock *sk,
 66                                      const struct inet_bind_bucket *tb, bool relax);
 67         void        (*mtu_reduced)(struct sock *sk);
 68 };
 69 
 70 /** inet_connection_sock - INET connection oriented sock
 71  *
 72  * @icsk_accept_queue:     FIFO of established children 
 73  * @icsk_bind_hash:        Bind node
 74  * @icsk_timeout:          Timeout
 75  * @icsk_retransmit_timer: Resend (no ack)
 76  * @icsk_rto:              Retransmit timeout
 77  * @icsk_pmtu_cookie       Last pmtu seen by socket
 78  * @icsk_ca_ops            Pluggable congestion control hook
 79  * @icsk_af_ops            Operations which are AF_INET{4,6} specific
 80  * @icsk_ca_state:         Congestion control state
 81  * @icsk_retransmits:      Number of unrecovered [RTO] timeouts
 82  * @icsk_pending:          Scheduled timer event
 83  * @icsk_backoff:          Backoff
 84  * @icsk_syn_retries:      Number of allowed SYN (or equivalent) retries
 85  * @icsk_probes_out:       unanswered 0 window probes
 86  * @icsk_ext_hdr_len:      Network protocol overhead (IP/IPv6 options)
 87  * @icsk_ack:              Delayed ACK control data
 88  * @icsk_mtup;             MTU probing control data
 89  */
 90 struct inet_connection_sock {
 91         /* inet_sock has to be the first member! */
 92         struct inet_sock          icsk_inet;
 93         struct request_sock_queue icsk_accept_queue;
 94         struct inet_bind_bucket   *icsk_bind_hash;
 95         unsigned long             icsk_timeout;
 96         struct timer_list         icsk_retransmit_timer;
 97         struct timer_list         icsk_delack_timer;
 98         __u32                     icsk_rto;
 99         __u32                     icsk_pmtu_cookie;
100         const struct tcp_congestion_ops *icsk_ca_ops;
101         const struct inet_connection_sock_af_ops *icsk_af_ops;
102         unsigned int              (*icsk_sync_mss)(struct sock *sk, u32 pmtu);
103         __u8                      icsk_ca_state:6,
104                                   icsk_ca_setsockopt:1,
105                                   icsk_ca_dst_locked:1;
106         __u8                      icsk_retransmits;
107         __u8                      icsk_pending;
108         __u8                      icsk_backoff;
109         __u8                      icsk_syn_retries;
110         __u8                      icsk_probes_out;
111         __u16                     icsk_ext_hdr_len;
112         struct {
113                 __u8              pending;       /* ACK is pending                         */
114                 __u8              quick;         /* Scheduled number of quick acks         */
115                 __u8              pingpong;      /* The session is interactive             */
116                 __u8              blocked;       /* Delayed ACK was blocked by socket lock */
117                 __u32             ato;           /* Predicted tick of soft clock           */
118                 unsigned long     timeout;       /* Currently scheduled timeout            */
119                 __u32             lrcvtime;      /* timestamp of last received data packet */
120                 __u16             last_seg_size; /* Size of last incoming segment          */
121                 __u16             rcv_mss;       /* MSS used for delayed ACK decisions     */ 
122         } icsk_ack;
123         struct {
124                 int               enabled;
125 
126                 /* Range of MTUs to search */
127                 int               search_high;
128                 int               search_low;
129 
130                 /* Information on the current probe. */
131                 int               probe_size;
132 
133                 u32               probe_timestamp;
134         } icsk_mtup;
135         u32                       icsk_user_timeout;
136 
137         u64                       icsk_ca_priv[64 / sizeof(u64)];
138 #define ICSK_CA_PRIV_SIZE      (8 * sizeof(u64))
139 };
140 
141 #define ICSK_TIME_RETRANS       1       /* Retransmit timer */
142 #define ICSK_TIME_DACK          2       /* Delayed ack timer */
143 #define ICSK_TIME_PROBE0        3       /* Zero window probe timer */
144 #define ICSK_TIME_EARLY_RETRANS 4       /* Early retransmit timer */
145 #define ICSK_TIME_LOSS_PROBE    5       /* Tail loss probe timer */
146 
147 static inline struct inet_connection_sock *inet_csk(const struct sock *sk)
148 {
149         return (struct inet_connection_sock *)sk;
150 }
151 
152 static inline void *inet_csk_ca(const struct sock *sk)
153 {
154         return (void *)inet_csk(sk)->icsk_ca_priv;
155 }
156 
157 struct sock *inet_csk_clone_lock(const struct sock *sk,
158                                  const struct request_sock *req,
159                                  const gfp_t priority);
160 
161 enum inet_csk_ack_state_t {
162         ICSK_ACK_SCHED  = 1,
163         ICSK_ACK_TIMER  = 2,
164         ICSK_ACK_PUSHED = 4,
165         ICSK_ACK_PUSHED2 = 8
166 };
167 
168 void inet_csk_init_xmit_timers(struct sock *sk,
169                                void (*retransmit_handler)(unsigned long),
170                                void (*delack_handler)(unsigned long),
171                                void (*keepalive_handler)(unsigned long));
172 void inet_csk_clear_xmit_timers(struct sock *sk);
173 
174 static inline void inet_csk_schedule_ack(struct sock *sk)
175 {
176         inet_csk(sk)->icsk_ack.pending |= ICSK_ACK_SCHED;
177 }
178 
179 static inline int inet_csk_ack_scheduled(const struct sock *sk)
180 {
181         return inet_csk(sk)->icsk_ack.pending & ICSK_ACK_SCHED;
182 }
183 
184 static inline void inet_csk_delack_init(struct sock *sk)
185 {
186         memset(&inet_csk(sk)->icsk_ack, 0, sizeof(inet_csk(sk)->icsk_ack));
187 }
188 
189 void inet_csk_delete_keepalive_timer(struct sock *sk);
190 void inet_csk_reset_keepalive_timer(struct sock *sk, unsigned long timeout);
191 
192 #ifdef INET_CSK_DEBUG
193 extern const char inet_csk_timer_bug_msg[];
194 #endif
195 
196 static inline void inet_csk_clear_xmit_timer(struct sock *sk, const int what)
197 {
198         struct inet_connection_sock *icsk = inet_csk(sk);
199         
200         if (what == ICSK_TIME_RETRANS || what == ICSK_TIME_PROBE0) {
201                 icsk->icsk_pending = 0;
202 #ifdef INET_CSK_CLEAR_TIMERS
203                 sk_stop_timer(sk, &icsk->icsk_retransmit_timer);
204 #endif
205         } else if (what == ICSK_TIME_DACK) {
206                 icsk->icsk_ack.blocked = icsk->icsk_ack.pending = 0;
207 #ifdef INET_CSK_CLEAR_TIMERS
208                 sk_stop_timer(sk, &icsk->icsk_delack_timer);
209 #endif
210         }
211 #ifdef INET_CSK_DEBUG
212         else {
213                 pr_debug("%s", inet_csk_timer_bug_msg);
214         }
215 #endif
216 }
217 
218 /*
219  *      Reset the retransmission timer
220  */
221 static inline void inet_csk_reset_xmit_timer(struct sock *sk, const int what,
222                                              unsigned long when,
223                                              const unsigned long max_when)
224 {
225         struct inet_connection_sock *icsk = inet_csk(sk);
226 
227         if (when > max_when) {
228 #ifdef INET_CSK_DEBUG
229                 pr_debug("reset_xmit_timer: sk=%p %d when=0x%lx, caller=%p\n",
230                          sk, what, when, current_text_addr());
231 #endif
232                 when = max_when;
233         }
234 
235         if (what == ICSK_TIME_RETRANS || what == ICSK_TIME_PROBE0 ||
236             what == ICSK_TIME_EARLY_RETRANS || what ==  ICSK_TIME_LOSS_PROBE) {
237                 icsk->icsk_pending = what;
238                 icsk->icsk_timeout = jiffies + when;
239                 sk_reset_timer(sk, &icsk->icsk_retransmit_timer, icsk->icsk_timeout);
240         } else if (what == ICSK_TIME_DACK) {
241                 icsk->icsk_ack.pending |= ICSK_ACK_TIMER;
242                 icsk->icsk_ack.timeout = jiffies + when;
243                 sk_reset_timer(sk, &icsk->icsk_delack_timer, icsk->icsk_ack.timeout);
244         }
245 #ifdef INET_CSK_DEBUG
246         else {
247                 pr_debug("%s", inet_csk_timer_bug_msg);
248         }
249 #endif
250 }
251 
252 static inline unsigned long
253 inet_csk_rto_backoff(const struct inet_connection_sock *icsk,
254                      unsigned long max_when)
255 {
256         u64 when = (u64)icsk->icsk_rto << icsk->icsk_backoff;
257 
258         return (unsigned long)min_t(u64, when, max_when);
259 }
260 
261 struct sock *inet_csk_accept(struct sock *sk, int flags, int *err);
262 
263 int inet_csk_bind_conflict(const struct sock *sk,
264                            const struct inet_bind_bucket *tb, bool relax);
265 int inet_csk_get_port(struct sock *sk, unsigned short snum);
266 
267 struct dst_entry *inet_csk_route_req(const struct sock *sk, struct flowi4 *fl4,
268                                      const struct request_sock *req);
269 struct dst_entry *inet_csk_route_child_sock(const struct sock *sk,
270                                             struct sock *newsk,
271                                             const struct request_sock *req);
272 
273 struct sock *inet_csk_reqsk_queue_add(struct sock *sk,
274                                       struct request_sock *req,
275                                       struct sock *child);
276 void inet_csk_reqsk_queue_hash_add(struct sock *sk, struct request_sock *req,
277                                    unsigned long timeout);
278 struct sock *inet_csk_complete_hashdance(struct sock *sk, struct sock *child,
279                                          struct request_sock *req,
280                                          bool own_req);
281 
282 static inline void inet_csk_reqsk_queue_added(struct sock *sk)
283 {
284         reqsk_queue_added(&inet_csk(sk)->icsk_accept_queue);
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 inet_csk_reqsk_queue_len(sk) >= sk->sk_max_ack_backlog;
300 }
301 
302 void inet_csk_reqsk_queue_drop(struct sock *sk, struct request_sock *req);
303 void inet_csk_reqsk_queue_drop_and_put(struct sock *sk, struct request_sock *req);
304 
305 void inet_csk_destroy_sock(struct sock *sk);
306 void inet_csk_prepare_forced_close(struct sock *sk);
307 
308 /*
309  * LISTEN is a special case for poll..
310  */
311 static inline unsigned int inet_csk_listen_poll(const struct sock *sk)
312 {
313         return !reqsk_queue_empty(&inet_csk(sk)->icsk_accept_queue) ?
314                         (POLLIN | POLLRDNORM) : 0;
315 }
316 
317 int inet_csk_listen_start(struct sock *sk, int backlog);
318 void inet_csk_listen_stop(struct sock *sk);
319 
320 void inet_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr);
321 
322 int inet_csk_compat_getsockopt(struct sock *sk, int level, int optname,
323                                char __user *optval, int __user *optlen);
324 int inet_csk_compat_setsockopt(struct sock *sk, int level, int optname,
325                                char __user *optval, unsigned int optlen);
326 
327 struct dst_entry *inet_csk_update_pmtu(struct sock *sk, u32 mtu);
328 #endif /* _INET_CONNECTION_SOCK_H */
329 

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