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Arnaldo Carvalho de Melo463c84b2005-08-09 20:10:42 -07001/*
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
Arnaldo Carvalho de Melo8292a172005-12-13 23:15:52 -080018#include <linux/compiler.h>
Arnaldo Carvalho de Melo3f421ba2005-08-09 20:11:08 -070019#include <linux/string.h>
Arnaldo Carvalho de Melo463c84b2005-08-09 20:10:42 -070020#include <linux/timer.h>
Al Virobd01f842006-10-19 17:23:57 -040021#include <linux/poll.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020022
23#include <net/inet_sock.h>
Arnaldo Carvalho de Melo463c84b2005-08-09 20:10:42 -070024#include <net/request_sock.h>
25
Arnaldo Carvalho de Melo3f421ba2005-08-09 20:11:08 -070026#define INET_CSK_DEBUG 1
27
28/* Cancel timers, when they are not required. */
29#undef INET_CSK_CLEAR_TIMERS
30
Arnaldo Carvalho de Melo463c84b2005-08-09 20:10:42 -070031struct inet_bind_bucket;
Arnaldo Carvalho de Melo6687e982005-08-10 04:03:31 -030032struct tcp_congestion_ops;
Arnaldo Carvalho de Melo463c84b2005-08-09 20:10:42 -070033
Arnaldo Carvalho de Melo8292a172005-12-13 23:15:52 -080034/*
35 * Pointers to address related TCP functions
36 * (i.e. things that depend on the address family)
37 */
38struct inet_connection_sock_af_ops {
David S. Millerd9d8da82011-05-06 22:23:20 -070039 int (*queue_xmit)(struct sk_buff *skb, struct flowi *fl);
Herbert Xubb296242010-04-11 02:15:55 +000040 void (*send_check)(struct sock *sk, struct sk_buff *skb);
Arnaldo Carvalho de Melo8292a172005-12-13 23:15:52 -080041 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);
David S. Miller3f419d22010-11-29 13:37:14 -080046 struct inet_peer *(*get_peer)(struct sock *sk, bool *release_it);
Arnaldo Carvalho de Melo850db6b2006-11-27 17:56:43 -020047 u16 net_header_len;
48 u16 sockaddr_len;
Arnaldo Carvalho de Melo8292a172005-12-13 23:15:52 -080049 int (*setsockopt)(struct sock *sk, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -070050 char __user *optval, unsigned int optlen);
Arnaldo Carvalho de Melo8292a172005-12-13 23:15:52 -080051 int (*getsockopt)(struct sock *sk, int level, int optname,
52 char __user *optval, int __user *optlen);
Alexey Dobriyanaf01d532008-08-28 02:53:51 -070053#ifdef CONFIG_COMPAT
Dmitry Mishin3fdadf72006-03-20 22:45:21 -080054 int (*compat_setsockopt)(struct sock *sk,
55 int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -070056 char __user *optval, unsigned int optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -080057 int (*compat_getsockopt)(struct sock *sk,
58 int level, int optname,
59 char __user *optval, int __user *optlen);
Alexey Dobriyanaf01d532008-08-28 02:53:51 -070060#endif
Arnaldo Carvalho de Melo8292a172005-12-13 23:15:52 -080061 void (*addr2sockaddr)(struct sock *sk, struct sockaddr *);
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -080062 int (*bind_conflict)(const struct sock *sk,
63 const struct inet_bind_bucket *tb);
Arnaldo Carvalho de Melo8292a172005-12-13 23:15:52 -080064};
65
Arnaldo Carvalho de Melo463c84b2005-08-09 20:10:42 -070066/** 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
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -080073 * @icsk_pmtu_cookie Last pmtu seen by socket
Arnaldo Carvalho de Melo6687e982005-08-10 04:03:31 -030074 * @icsk_ca_ops Pluggable congestion control hook
Arnaldo Carvalho de Melo8292a172005-12-13 23:15:52 -080075 * @icsk_af_ops Operations which are AF_INET{4,6} specific
Arnaldo Carvalho de Melo6687e982005-08-10 04:03:31 -030076 * @icsk_ca_state: Congestion control state
Arnaldo Carvalho de Melo463c84b2005-08-09 20:10:42 -070077 * @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
Arnaldo Carvalho de Melo6687e982005-08-10 04:03:31 -030081 * @icsk_probes_out: unanswered 0 window probes
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -080082 * @icsk_ext_hdr_len: Network protocol overhead (IP/IPv6 options)
Arnaldo Carvalho de Melo463c84b2005-08-09 20:10:42 -070083 * @icsk_ack: Delayed ACK control data
John Heffner5d424d52006-03-20 17:53:41 -080084 * @icsk_mtup; MTU probing control data
Arnaldo Carvalho de Melo463c84b2005-08-09 20:10:42 -070085 */
86struct 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;
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -080095 __u32 icsk_pmtu_cookie;
Stephen Hemminger770cfbc2006-01-09 15:56:09 -080096 const struct tcp_congestion_ops *icsk_ca_ops;
97 const struct inet_connection_sock_af_ops *icsk_af_ops;
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -080098 unsigned int (*icsk_sync_mss)(struct sock *sk, u32 pmtu);
Arnaldo Carvalho de Melo6687e982005-08-10 04:03:31 -030099 __u8 icsk_ca_state;
Arnaldo Carvalho de Melo463c84b2005-08-09 20:10:42 -0700100 __u8 icsk_retransmits;
101 __u8 icsk_pending;
102 __u8 icsk_backoff;
103 __u8 icsk_syn_retries;
Arnaldo Carvalho de Melo6687e982005-08-10 04:03:31 -0300104 __u8 icsk_probes_out;
Arnaldo Carvalho de Melod83d8462005-12-13 23:26:10 -0800105 __u16 icsk_ext_hdr_len;
Arnaldo Carvalho de Melo463c84b2005-08-09 20:10:42 -0700106 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;
John Heffner5d424d52006-03-20 17:53:41 -0800117 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;
John Heffner5d424d52006-03-20 17:53:41 -0800126 } icsk_mtup;
Arnaldo Carvalho de Melo6687e982005-08-10 04:03:31 -0300127 u32 icsk_ca_priv[16];
Jerry Chudca43c72010-08-27 19:13:28 +0000128 u32 icsk_user_timeout;
Arnaldo Carvalho de Melo6687e982005-08-10 04:03:31 -0300129#define ICSK_CA_PRIV_SIZE (16 * sizeof(u32))
Arnaldo Carvalho de Melo463c84b2005-08-09 20:10:42 -0700130};
131
Arnaldo Carvalho de Melo3f421ba2005-08-09 20:11:08 -0700132#define ICSK_TIME_RETRANS 1 /* Retransmit timer */
133#define ICSK_TIME_DACK 2 /* Delayed ack timer */
134#define ICSK_TIME_PROBE0 3 /* Zero window probe timer */
Arnaldo Carvalho de Melo3f421ba2005-08-09 20:11:08 -0700135
Arnaldo Carvalho de Melo463c84b2005-08-09 20:10:42 -0700136static inline struct inet_connection_sock *inet_csk(const struct sock *sk)
137{
138 return (struct inet_connection_sock *)sk;
139}
140
Arnaldo Carvalho de Melo6687e982005-08-10 04:03:31 -0300141static inline void *inet_csk_ca(const struct sock *sk)
142{
143 return (void *)inet_csk(sk)->icsk_ca_priv;
144}
145
Arnaldo Carvalho de Melo9f1d2602005-08-09 20:11:24 -0700146extern struct sock *inet_csk_clone(struct sock *sk,
147 const struct request_sock *req,
Al Virodd0fc662005-10-07 07:46:04 +0100148 const gfp_t priority);
Arnaldo Carvalho de Melo9f1d2602005-08-09 20:11:24 -0700149
Arnaldo Carvalho de Melo3f421ba2005-08-09 20:11:08 -0700150enum inet_csk_ack_state_t {
151 ICSK_ACK_SCHED = 1,
152 ICSK_ACK_TIMER = 2,
Alexey Kuznetsov1ef96962006-09-19 12:52:50 -0700153 ICSK_ACK_PUSHED = 4,
154 ICSK_ACK_PUSHED2 = 8
Arnaldo Carvalho de Melo3f421ba2005-08-09 20:11:08 -0700155};
156
Arnaldo Carvalho de Melo463c84b2005-08-09 20:10:42 -0700157extern 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));
161extern void inet_csk_clear_xmit_timers(struct sock *sk);
162
Arnaldo Carvalho de Melo3f421ba2005-08-09 20:11:08 -0700163static inline void inet_csk_schedule_ack(struct sock *sk)
164{
165 inet_csk(sk)->icsk_ack.pending |= ICSK_ACK_SCHED;
166}
167
168static inline int inet_csk_ack_scheduled(const struct sock *sk)
169{
170 return inet_csk(sk)->icsk_ack.pending & ICSK_ACK_SCHED;
171}
172
173static 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
178extern void inet_csk_delete_keepalive_timer(struct sock *sk);
179extern void inet_csk_reset_keepalive_timer(struct sock *sk, unsigned long timeout);
180
181#ifdef INET_CSK_DEBUG
182extern const char inet_csk_timer_bug_msg[];
183#endif
184
185static 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 {
Stephen Hemmingerd8971fc2005-08-29 22:51:28 -0700202 pr_debug("%s", inet_csk_timer_bug_msg);
Arnaldo Carvalho de Melo3f421ba2005-08-09 20:11:08 -0700203 }
204#endif
205}
206
207/*
208 * Reset the retransmission timer
209 */
210static 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 {
Stephen Hemmingerd8971fc2005-08-29 22:51:28 -0700235 pr_debug("%s", inet_csk_timer_bug_msg);
Arnaldo Carvalho de Melo3f421ba2005-08-09 20:11:08 -0700236 }
237#endif
238}
239
240extern struct sock *inet_csk_accept(struct sock *sk, int flags, int *err);
241
Arnaldo Carvalho de Melo463c84b2005-08-09 20:10:42 -0700242extern struct request_sock *inet_csk_search_req(const struct sock *sk,
243 struct request_sock ***prevp,
Al Viro6b729772006-09-27 18:36:59 -0700244 const __be16 rport,
Al Viro7f25afb2006-09-27 18:27:47 -0700245 const __be32 raddr,
246 const __be32 laddr);
Arnaldo Carvalho de Melo971af182005-12-13 23:14:47 -0800247extern int inet_csk_bind_conflict(const struct sock *sk,
248 const struct inet_bind_bucket *tb);
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -0800249extern int inet_csk_get_port(struct sock *sk, unsigned short snum);
Arnaldo Carvalho de Melo463c84b2005-08-09 20:10:42 -0700250
251extern struct dst_entry* inet_csk_route_req(struct sock *sk,
David S. Miller6bd023f2011-05-18 18:32:03 -0400252 struct flowi4 *fl4,
Arnaldo Carvalho de Melo463c84b2005-08-09 20:10:42 -0700253 const struct request_sock *req);
David S. Miller77357a92011-05-08 14:34:22 -0700254extern struct dst_entry* inet_csk_route_child_sock(struct sock *sk,
255 struct sock *newsk,
256 const struct request_sock *req);
Arnaldo Carvalho de Melo463c84b2005-08-09 20:10:42 -0700257
Arnaldo Carvalho de Melo3f421ba2005-08-09 20:11:08 -0700258static inline void inet_csk_reqsk_queue_add(struct sock *sk,
259 struct request_sock *req,
260 struct sock *child)
261{
262 reqsk_queue_add(&inet_csk(sk)->icsk_accept_queue, req, sk, child);
263}
264
265extern void inet_csk_reqsk_queue_hash_add(struct sock *sk,
266 struct request_sock *req,
Arnaldo Carvalho de Meloc2977c22005-12-13 23:15:12 -0800267 unsigned long timeout);
Arnaldo Carvalho de Melo3f421ba2005-08-09 20:11:08 -0700268
269static inline void inet_csk_reqsk_queue_removed(struct sock *sk,
270 struct request_sock *req)
271{
272 if (reqsk_queue_removed(&inet_csk(sk)->icsk_accept_queue, req) == 0)
273 inet_csk_delete_keepalive_timer(sk);
274}
275
276static inline void inet_csk_reqsk_queue_added(struct sock *sk,
277 const unsigned long timeout)
278{
279 if (reqsk_queue_added(&inet_csk(sk)->icsk_accept_queue) == 0)
280 inet_csk_reset_keepalive_timer(sk, timeout);
281}
282
283static inline int inet_csk_reqsk_queue_len(const struct sock *sk)
284{
285 return reqsk_queue_len(&inet_csk(sk)->icsk_accept_queue);
286}
287
288static inline int inet_csk_reqsk_queue_young(const struct sock *sk)
289{
290 return reqsk_queue_len_young(&inet_csk(sk)->icsk_accept_queue);
291}
292
293static inline int inet_csk_reqsk_queue_is_full(const struct sock *sk)
294{
295 return reqsk_queue_is_full(&inet_csk(sk)->icsk_accept_queue);
296}
297
298static inline void inet_csk_reqsk_queue_unlink(struct sock *sk,
299 struct request_sock *req,
300 struct request_sock **prev)
301{
302 reqsk_queue_unlink(&inet_csk(sk)->icsk_accept_queue, req, prev);
303}
304
305static inline void inet_csk_reqsk_queue_drop(struct sock *sk,
306 struct request_sock *req,
307 struct request_sock **prev)
308{
309 inet_csk_reqsk_queue_unlink(sk, req, prev);
310 inet_csk_reqsk_queue_removed(sk, req);
311 reqsk_free(req);
312}
313
Arnaldo Carvalho de Meloa019d6f2005-08-09 20:15:09 -0700314extern void inet_csk_reqsk_queue_prune(struct sock *parent,
315 const unsigned long interval,
316 const unsigned long timeout,
317 const unsigned long max_rto);
318
319extern void inet_csk_destroy_sock(struct sock *sk);
Arnaldo Carvalho de Melodc40c7b2005-08-23 21:52:58 -0700320
321/*
322 * LISTEN is a special case for poll..
323 */
324static inline unsigned int inet_csk_listen_poll(const struct sock *sk)
325{
326 return !reqsk_queue_empty(&inet_csk(sk)->icsk_accept_queue) ?
327 (POLLIN | POLLRDNORM) : 0;
328}
329
Arnaldo Carvalho de Meloa019d6f2005-08-09 20:15:09 -0700330extern int inet_csk_listen_start(struct sock *sk, const int nr_table_entries);
Arnaldo Carvalho de Melo295f7322005-08-09 20:11:56 -0700331extern void inet_csk_listen_stop(struct sock *sk);
332
Arnaldo Carvalho de Meloaf05dc92005-12-13 23:16:04 -0800333extern void inet_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr);
334
Arnaldo Carvalho de Melodec73ff2006-03-20 22:46:16 -0800335extern int inet_csk_compat_getsockopt(struct sock *sk, int level, int optname,
336 char __user *optval, int __user *optlen);
337extern int inet_csk_compat_setsockopt(struct sock *sk, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -0700338 char __user *optval, unsigned int optlen);
Arnaldo Carvalho de Melo463c84b2005-08-09 20:10:42 -0700339#endif /* _INET_CONNECTION_SOCK_H */