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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         void        (*mtu_reduced)(struct sock *sk);
 66 };
 67 
 68 /** inet_connection_sock - INET connection oriented sock
 69  *
 70  * @icsk_accept_queue:     FIFO of established children 
 71  * @icsk_bind_hash:        Bind node
 72  * @icsk_timeout:          Timeout
 73  * @icsk_retransmit_timer: Resend (no ack)
 74  * @icsk_rto:              Retransmit timeout
 75  * @icsk_pmtu_cookie       Last pmtu seen by socket
 76  * @icsk_ca_ops            Pluggable congestion control hook
 77  * @icsk_af_ops            Operations which are AF_INET{4,6} specific
 78  * @icsk_ulp_ops           Pluggable ULP control hook
 79  * @icsk_ulp_data          ULP private data
 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         const struct tcp_ulp_ops  *icsk_ulp_ops;
103         void                      *icsk_ulp_data;
104         unsigned int              (*icsk_sync_mss)(struct sock *sk, u32 pmtu);
105         __u8                      icsk_ca_state:6,
106                                   icsk_ca_setsockopt:1,
107                                   icsk_ca_dst_locked:1;
108         __u8                      icsk_retransmits;
109         __u8                      icsk_pending;
110         __u8                      icsk_backoff;
111         __u8                      icsk_syn_retries;
112         __u8                      icsk_probes_out;
113         __u16                     icsk_ext_hdr_len;
114         struct {
115                 __u8              pending;       /* ACK is pending                         */
116                 __u8              quick;         /* Scheduled number of quick acks         */
117                 __u8              pingpong;      /* The session is interactive             */
118                 __u8              blocked;       /* Delayed ACK was blocked by socket lock */
119                 __u32             ato;           /* Predicted tick of soft clock           */
120                 unsigned long     timeout;       /* Currently scheduled timeout            */
121                 __u32             lrcvtime;      /* timestamp of last received data packet */
122                 __u16             last_seg_size; /* Size of last incoming segment          */
123                 __u16             rcv_mss;       /* MSS used for delayed ACK decisions     */ 
124         } icsk_ack;
125         struct {
126                 int               enabled;
127 
128                 /* Range of MTUs to search */
129                 int               search_high;
130                 int               search_low;
131 
132                 /* Information on the current probe. */
133                 int               probe_size;
134 
135                 u32               probe_timestamp;
136         } icsk_mtup;
137         u32                       icsk_user_timeout;
138 
139         u64                       icsk_ca_priv[88 / sizeof(u64)];
140 #define ICSK_CA_PRIV_SIZE      (11 * sizeof(u64))
141 };
142 
143 #define ICSK_TIME_RETRANS       1       /* Retransmit timer */
144 #define ICSK_TIME_DACK          2       /* Delayed ack timer */
145 #define ICSK_TIME_PROBE0        3       /* Zero window probe timer */
146 #define ICSK_TIME_EARLY_RETRANS 4       /* Early retransmit timer */
147 #define ICSK_TIME_LOSS_PROBE    5       /* Tail loss probe timer */
148 #define ICSK_TIME_REO_TIMEOUT   6       /* Reordering timer */
149 
150 static inline struct inet_connection_sock *inet_csk(const struct sock *sk)
151 {
152         return (struct inet_connection_sock *)sk;
153 }
154 
155 static inline void *inet_csk_ca(const struct sock *sk)
156 {
157         return (void *)inet_csk(sk)->icsk_ca_priv;
158 }
159 
160 struct sock *inet_csk_clone_lock(const struct sock *sk,
161                                  const struct request_sock *req,
162                                  const gfp_t priority);
163 
164 enum inet_csk_ack_state_t {
165         ICSK_ACK_SCHED  = 1,
166         ICSK_ACK_TIMER  = 2,
167         ICSK_ACK_PUSHED = 4,
168         ICSK_ACK_PUSHED2 = 8
169 };
170 
171 void inet_csk_init_xmit_timers(struct sock *sk,
172                                void (*retransmit_handler)(unsigned long),
173                                void (*delack_handler)(unsigned long),
174                                void (*keepalive_handler)(unsigned long));
175 void inet_csk_clear_xmit_timers(struct sock *sk);
176 
177 static inline void inet_csk_schedule_ack(struct sock *sk)
178 {
179         inet_csk(sk)->icsk_ack.pending |= ICSK_ACK_SCHED;
180 }
181 
182 static inline int inet_csk_ack_scheduled(const struct sock *sk)
183 {
184         return inet_csk(sk)->icsk_ack.pending & ICSK_ACK_SCHED;
185 }
186 
187 static inline void inet_csk_delack_init(struct sock *sk)
188 {
189         memset(&inet_csk(sk)->icsk_ack, 0, sizeof(inet_csk(sk)->icsk_ack));
190 }
191 
192 void inet_csk_delete_keepalive_timer(struct sock *sk);
193 void inet_csk_reset_keepalive_timer(struct sock *sk, unsigned long timeout);
194 
195 #ifdef INET_CSK_DEBUG
196 extern const char inet_csk_timer_bug_msg[];
197 #endif
198 
199 static inline void inet_csk_clear_xmit_timer(struct sock *sk, const int what)
200 {
201         struct inet_connection_sock *icsk = inet_csk(sk);
202         
203         if (what == ICSK_TIME_RETRANS || what == ICSK_TIME_PROBE0) {
204                 icsk->icsk_pending = 0;
205 #ifdef INET_CSK_CLEAR_TIMERS
206                 sk_stop_timer(sk, &icsk->icsk_retransmit_timer);
207 #endif
208         } else if (what == ICSK_TIME_DACK) {
209                 icsk->icsk_ack.blocked = icsk->icsk_ack.pending = 0;
210 #ifdef INET_CSK_CLEAR_TIMERS
211                 sk_stop_timer(sk, &icsk->icsk_delack_timer);
212 #endif
213         }
214 #ifdef INET_CSK_DEBUG
215         else {
216                 pr_debug("%s", inet_csk_timer_bug_msg);
217         }
218 #endif
219 }
220 
221 /*
222  *      Reset the retransmission timer
223  */
224 static inline void inet_csk_reset_xmit_timer(struct sock *sk, const int what,
225                                              unsigned long when,
226                                              const unsigned long max_when)
227 {
228         struct inet_connection_sock *icsk = inet_csk(sk);
229 
230         if (when > max_when) {
231 #ifdef INET_CSK_DEBUG
232                 pr_debug("reset_xmit_timer: sk=%p %d when=0x%lx, caller=%p\n",
233                          sk, what, when, current_text_addr());
234 #endif
235                 when = max_when;
236         }
237 
238         if (what == ICSK_TIME_RETRANS || what == ICSK_TIME_PROBE0 ||
239             what == ICSK_TIME_EARLY_RETRANS || what == ICSK_TIME_LOSS_PROBE ||
240             what == ICSK_TIME_REO_TIMEOUT) {
241                 icsk->icsk_pending = what;
242                 icsk->icsk_timeout = jiffies + when;
243                 sk_reset_timer(sk, &icsk->icsk_retransmit_timer, icsk->icsk_timeout);
244         } else if (what == ICSK_TIME_DACK) {
245                 icsk->icsk_ack.pending |= ICSK_ACK_TIMER;
246                 icsk->icsk_ack.timeout = jiffies + when;
247                 sk_reset_timer(sk, &icsk->icsk_delack_timer, icsk->icsk_ack.timeout);
248         }
249 #ifdef INET_CSK_DEBUG
250         else {
251                 pr_debug("%s", inet_csk_timer_bug_msg);
252         }
253 #endif
254 }
255 
256 static inline unsigned long
257 inet_csk_rto_backoff(const struct inet_connection_sock *icsk,
258                      unsigned long max_when)
259 {
260         u64 when = (u64)icsk->icsk_rto << icsk->icsk_backoff;
261 
262         return (unsigned long)min_t(u64, when, max_when);
263 }
264 
265 struct sock *inet_csk_accept(struct sock *sk, int flags, int *err, bool kern);
266 
267 int inet_csk_get_port(struct sock *sk, unsigned short snum);
268 
269 struct dst_entry *inet_csk_route_req(const struct sock *sk, struct flowi4 *fl4,
270                                      const struct request_sock *req);
271 struct dst_entry *inet_csk_route_child_sock(const struct sock *sk,
272                                             struct sock *newsk,
273                                             const struct request_sock *req);
274 
275 struct sock *inet_csk_reqsk_queue_add(struct sock *sk,
276                                       struct request_sock *req,
277                                       struct sock *child);
278 void inet_csk_reqsk_queue_hash_add(struct sock *sk, struct request_sock *req,
279                                    unsigned long timeout);
280 struct sock *inet_csk_complete_hashdance(struct sock *sk, struct sock *child,
281                                          struct request_sock *req,
282                                          bool own_req);
283 
284 static inline void inet_csk_reqsk_queue_added(struct sock *sk)
285 {
286         reqsk_queue_added(&inet_csk(sk)->icsk_accept_queue);
287 }
288 
289 static inline int inet_csk_reqsk_queue_len(const struct sock *sk)
290 {
291         return reqsk_queue_len(&inet_csk(sk)->icsk_accept_queue);
292 }
293 
294 static inline int inet_csk_reqsk_queue_is_full(const struct sock *sk)
295 {
296         return inet_csk_reqsk_queue_len(sk) >= sk->sk_max_ack_backlog;
297 }
298 
299 void inet_csk_reqsk_queue_drop(struct sock *sk, struct request_sock *req);
300 void inet_csk_reqsk_queue_drop_and_put(struct sock *sk, struct request_sock *req);
301 
302 void inet_csk_destroy_sock(struct sock *sk);
303 void inet_csk_prepare_forced_close(struct sock *sk);
304 
305 /*
306  * LISTEN is a special case for poll..
307  */
308 static inline unsigned int inet_csk_listen_poll(const struct sock *sk)
309 {
310         return !reqsk_queue_empty(&inet_csk(sk)->icsk_accept_queue) ?
311                         (POLLIN | POLLRDNORM) : 0;
312 }
313 
314 int inet_csk_listen_start(struct sock *sk, int backlog);
315 void inet_csk_listen_stop(struct sock *sk);
316 
317 void inet_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr);
318 
319 int inet_csk_compat_getsockopt(struct sock *sk, int level, int optname,
320                                char __user *optval, int __user *optlen);
321 int inet_csk_compat_setsockopt(struct sock *sk, int level, int optname,
322                                char __user *optval, unsigned int optlen);
323 
324 struct dst_entry *inet_csk_update_pmtu(struct sock *sk, u32 mtu);
325 #endif /* _INET_CONNECTION_SOCK_H */
326 

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