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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
31struct inet_bind_bucket;
32struct tcp_congestion_ops;
33
34/*
35 * Pointers to address related TCP functions
36 * (i.e. things that depend on the address family)
37 */
38struct 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_listen_portaddr_node hash to the portaddr listener hashtable
81 * @icsk_ca_state: Congestion control state
82 * @icsk_retransmits: Number of unrecovered [RTO] timeouts
83 * @icsk_pending: Scheduled timer event
84 * @icsk_backoff: Backoff
85 * @icsk_syn_retries: Number of allowed SYN (or equivalent) retries
86 * @icsk_probes_out: unanswered 0 window probes
87 * @icsk_ext_hdr_len: Network protocol overhead (IP/IPv6 options)
88 * @icsk_ack: Delayed ACK control data
89 * @icsk_mtup; MTU probing control data
90 */
91struct inet_connection_sock {
92 /* inet_sock has to be the first member! */
93 struct inet_sock icsk_inet;
94 struct request_sock_queue icsk_accept_queue;
95 struct inet_bind_bucket *icsk_bind_hash;
96 unsigned long icsk_timeout;
97 struct timer_list icsk_retransmit_timer;
98 struct timer_list icsk_delack_timer;
99 __u32 icsk_rto;
100 __u32 icsk_pmtu_cookie;
101 const struct tcp_congestion_ops *icsk_ca_ops;
102 const struct inet_connection_sock_af_ops *icsk_af_ops;
103 const struct tcp_ulp_ops *icsk_ulp_ops;
104 void *icsk_ulp_data;
105 struct hlist_node icsk_listen_portaddr_node;
106 unsigned int (*icsk_sync_mss)(struct sock *sk, u32 pmtu);
107 __u8 icsk_ca_state:6,
108 icsk_ca_setsockopt:1,
109 icsk_ca_dst_locked:1;
110 __u8 icsk_retransmits;
111 __u8 icsk_pending;
112 __u8 icsk_backoff;
113 __u8 icsk_syn_retries;
114 __u8 icsk_probes_out;
115 __u16 icsk_ext_hdr_len;
116 struct {
117 __u8 pending; /* ACK is pending */
118 __u8 quick; /* Scheduled number of quick acks */
119 __u8 pingpong; /* The session is interactive */
120 __u8 blocked; /* Delayed ACK was blocked by socket lock */
121 __u32 ato; /* Predicted tick of soft clock */
122 unsigned long timeout; /* Currently scheduled timeout */
123 __u32 lrcvtime; /* timestamp of last received data packet */
124 __u16 last_seg_size; /* Size of last incoming segment */
125 __u16 rcv_mss; /* MSS used for delayed ACK decisions */
126 } icsk_ack;
127 struct {
128 int enabled;
129
130 /* Range of MTUs to search */
131 int search_high;
132 int search_low;
133
134 /* Information on the current probe. */
135 int probe_size;
136
137 u32 probe_timestamp;
138 } icsk_mtup;
139 u32 icsk_user_timeout;
140
141 u64 icsk_ca_priv[88 / sizeof(u64)];
142#define ICSK_CA_PRIV_SIZE (11 * sizeof(u64))
143};
144
145#define ICSK_TIME_RETRANS 1 /* Retransmit timer */
146#define ICSK_TIME_DACK 2 /* Delayed ack timer */
147#define ICSK_TIME_PROBE0 3 /* Zero window probe timer */
148#define ICSK_TIME_EARLY_RETRANS 4 /* Early retransmit timer */
149#define ICSK_TIME_LOSS_PROBE 5 /* Tail loss probe timer */
150#define ICSK_TIME_REO_TIMEOUT 6 /* Reordering timer */
151
152static inline struct inet_connection_sock *inet_csk(const struct sock *sk)
153{
154 return (struct inet_connection_sock *)sk;
155}
156
157static inline void *inet_csk_ca(const struct sock *sk)
158{
159 return (void *)inet_csk(sk)->icsk_ca_priv;
160}
161
162struct sock *inet_csk_clone_lock(const struct sock *sk,
163 const struct request_sock *req,
164 const gfp_t priority);
165
166enum inet_csk_ack_state_t {
167 ICSK_ACK_SCHED = 1,
168 ICSK_ACK_TIMER = 2,
169 ICSK_ACK_PUSHED = 4,
170 ICSK_ACK_PUSHED2 = 8
171};
172
173void inet_csk_init_xmit_timers(struct sock *sk,
174 void (*retransmit_handler)(struct timer_list *),
175 void (*delack_handler)(struct timer_list *),
176 void (*keepalive_handler)(struct timer_list *));
177void inet_csk_clear_xmit_timers(struct sock *sk);
178
179static inline void inet_csk_schedule_ack(struct sock *sk)
180{
181 inet_csk(sk)->icsk_ack.pending |= ICSK_ACK_SCHED;
182}
183
184static inline int inet_csk_ack_scheduled(const struct sock *sk)
185{
186 return inet_csk(sk)->icsk_ack.pending & ICSK_ACK_SCHED;
187}
188
189static inline void inet_csk_delack_init(struct sock *sk)
190{
191 memset(&inet_csk(sk)->icsk_ack, 0, sizeof(inet_csk(sk)->icsk_ack));
192}
193
194void inet_csk_delete_keepalive_timer(struct sock *sk);
195void inet_csk_reset_keepalive_timer(struct sock *sk, unsigned long timeout);
196
197#ifdef INET_CSK_DEBUG
198extern const char inet_csk_timer_bug_msg[];
199#endif
200
201static inline void inet_csk_clear_xmit_timer(struct sock *sk, const int what)
202{
203 struct inet_connection_sock *icsk = inet_csk(sk);
204
205 if (what == ICSK_TIME_RETRANS || what == ICSK_TIME_PROBE0) {
206 icsk->icsk_pending = 0;
207#ifdef INET_CSK_CLEAR_TIMERS
208 sk_stop_timer(sk, &icsk->icsk_retransmit_timer);
209#endif
210 } else if (what == ICSK_TIME_DACK) {
211 icsk->icsk_ack.blocked = icsk->icsk_ack.pending = 0;
212#ifdef INET_CSK_CLEAR_TIMERS
213 sk_stop_timer(sk, &icsk->icsk_delack_timer);
214#endif
215 }
216#ifdef INET_CSK_DEBUG
217 else {
218 pr_debug("%s", inet_csk_timer_bug_msg);
219 }
220#endif
221}
222
223/*
224 * Reset the retransmission timer
225 */
226static inline void inet_csk_reset_xmit_timer(struct sock *sk, const int what,
227 unsigned long when,
228 const unsigned long max_when)
229{
230 struct inet_connection_sock *icsk = inet_csk(sk);
231
232 if (when > max_when) {
233#ifdef INET_CSK_DEBUG
234 pr_debug("reset_xmit_timer: sk=%p %d when=0x%lx, caller=%p\n",
235 sk, what, when, current_text_addr());
236#endif
237 when = max_when;
238 }
239
240 if (what == ICSK_TIME_RETRANS || what == ICSK_TIME_PROBE0 ||
241 what == ICSK_TIME_EARLY_RETRANS || what == ICSK_TIME_LOSS_PROBE ||
242 what == ICSK_TIME_REO_TIMEOUT) {
243 icsk->icsk_pending = what;
244 icsk->icsk_timeout = jiffies + when;
245 sk_reset_timer(sk, &icsk->icsk_retransmit_timer, icsk->icsk_timeout);
246 } else if (what == ICSK_TIME_DACK) {
247 icsk->icsk_ack.pending |= ICSK_ACK_TIMER;
248 icsk->icsk_ack.timeout = jiffies + when;
249 sk_reset_timer(sk, &icsk->icsk_delack_timer, icsk->icsk_ack.timeout);
250 }
251#ifdef INET_CSK_DEBUG
252 else {
253 pr_debug("%s", inet_csk_timer_bug_msg);
254 }
255#endif
256}
257
258static inline unsigned long
259inet_csk_rto_backoff(const struct inet_connection_sock *icsk,
260 unsigned long max_when)
261{
262 u64 when = (u64)icsk->icsk_rto << icsk->icsk_backoff;
263
264 return (unsigned long)min_t(u64, when, max_when);
265}
266
267struct sock *inet_csk_accept(struct sock *sk, int flags, int *err, bool kern);
268
269int inet_csk_get_port(struct sock *sk, unsigned short snum);
270
271struct dst_entry *inet_csk_route_req(const struct sock *sk, struct flowi4 *fl4,
272 const struct request_sock *req);
273struct dst_entry *inet_csk_route_child_sock(const struct sock *sk,
274 struct sock *newsk,
275 const struct request_sock *req);
276
277struct sock *inet_csk_reqsk_queue_add(struct sock *sk,
278 struct request_sock *req,
279 struct sock *child);
280void inet_csk_reqsk_queue_hash_add(struct sock *sk, struct request_sock *req,
281 unsigned long timeout);
282struct sock *inet_csk_complete_hashdance(struct sock *sk, struct sock *child,
283 struct request_sock *req,
284 bool own_req);
285
286static inline void inet_csk_reqsk_queue_added(struct sock *sk)
287{
288 reqsk_queue_added(&inet_csk(sk)->icsk_accept_queue);
289}
290
291static inline int inet_csk_reqsk_queue_len(const struct sock *sk)
292{
293 return reqsk_queue_len(&inet_csk(sk)->icsk_accept_queue);
294}
295
296static inline int inet_csk_reqsk_queue_is_full(const struct sock *sk)
297{
298 return inet_csk_reqsk_queue_len(sk) >= sk->sk_max_ack_backlog;
299}
300
301void inet_csk_reqsk_queue_drop(struct sock *sk, struct request_sock *req);
302void inet_csk_reqsk_queue_drop_and_put(struct sock *sk, struct request_sock *req);
303
304void inet_csk_destroy_sock(struct sock *sk);
305void inet_csk_prepare_forced_close(struct sock *sk);
306
307/*
308 * LISTEN is a special case for poll..
309 */
310static inline __poll_t inet_csk_listen_poll(const struct sock *sk)
311{
312 return !reqsk_queue_empty(&inet_csk(sk)->icsk_accept_queue) ?
313 (EPOLLIN | EPOLLRDNORM) : 0;
314}
315
316int inet_csk_listen_start(struct sock *sk, int backlog);
317void inet_csk_listen_stop(struct sock *sk);
318
319void inet_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr);
320
321int inet_csk_compat_getsockopt(struct sock *sk, int level, int optname,
322 char __user *optval, int __user *optlen);
323int inet_csk_compat_setsockopt(struct sock *sk, int level, int optname,
324 char __user *optval, unsigned int optlen);
325
326struct dst_entry *inet_csk_update_pmtu(struct sock *sk, u32 mtu);
327#endif /* _INET_CONNECTION_SOCK_H */
1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * NET Generic infrastructure for INET connection oriented protocols.
4 *
5 * Definitions for inet_connection_sock
6 *
7 * Authors: Many people, see the TCP sources
8 *
9 * From code originally in TCP
10 */
11#ifndef _INET_CONNECTION_SOCK_H
12#define _INET_CONNECTION_SOCK_H
13
14#include <linux/compiler.h>
15#include <linux/string.h>
16#include <linux/timer.h>
17#include <linux/poll.h>
18#include <linux/kernel.h>
19
20#include <net/inet_sock.h>
21#include <net/request_sock.h>
22
23/* Cancel timers, when they are not required. */
24#undef INET_CSK_CLEAR_TIMERS
25
26struct inet_bind_bucket;
27struct tcp_congestion_ops;
28
29/*
30 * Pointers to address related TCP functions
31 * (i.e. things that depend on the address family)
32 */
33struct inet_connection_sock_af_ops {
34 int (*queue_xmit)(struct sock *sk, struct sk_buff *skb, struct flowi *fl);
35 void (*send_check)(struct sock *sk, struct sk_buff *skb);
36 int (*rebuild_header)(struct sock *sk);
37 void (*sk_rx_dst_set)(struct sock *sk, const struct sk_buff *skb);
38 int (*conn_request)(struct sock *sk, struct sk_buff *skb);
39 struct sock *(*syn_recv_sock)(const struct sock *sk, struct sk_buff *skb,
40 struct request_sock *req,
41 struct dst_entry *dst,
42 struct request_sock *req_unhash,
43 bool *own_req);
44 u16 net_header_len;
45 u16 net_frag_header_len;
46 u16 sockaddr_len;
47 int (*setsockopt)(struct sock *sk, int level, int optname,
48 char __user *optval, unsigned int optlen);
49 int (*getsockopt)(struct sock *sk, int level, int optname,
50 char __user *optval, int __user *optlen);
51#ifdef CONFIG_COMPAT
52 int (*compat_setsockopt)(struct sock *sk,
53 int level, int optname,
54 char __user *optval, unsigned int optlen);
55 int (*compat_getsockopt)(struct sock *sk,
56 int level, int optname,
57 char __user *optval, int __user *optlen);
58#endif
59 void (*addr2sockaddr)(struct sock *sk, struct sockaddr *);
60 void (*mtu_reduced)(struct sock *sk);
61};
62
63/** inet_connection_sock - INET connection oriented sock
64 *
65 * @icsk_accept_queue: FIFO of established children
66 * @icsk_bind_hash: Bind node
67 * @icsk_timeout: Timeout
68 * @icsk_retransmit_timer: Resend (no ack)
69 * @icsk_rto: Retransmit timeout
70 * @icsk_pmtu_cookie Last pmtu seen by socket
71 * @icsk_ca_ops Pluggable congestion control hook
72 * @icsk_af_ops Operations which are AF_INET{4,6} specific
73 * @icsk_ulp_ops Pluggable ULP control hook
74 * @icsk_ulp_data ULP private data
75 * @icsk_clean_acked Clean acked data hook
76 * @icsk_listen_portaddr_node hash to the portaddr listener hashtable
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 */
87struct 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 const struct tcp_ulp_ops *icsk_ulp_ops;
100 void __rcu *icsk_ulp_data;
101 void (*icsk_clean_acked)(struct sock *sk, u32 acked_seq);
102 struct hlist_node icsk_listen_portaddr_node;
103 unsigned int (*icsk_sync_mss)(struct sock *sk, u32 pmtu);
104 __u8 icsk_ca_state:6,
105 icsk_ca_setsockopt:1,
106 icsk_ca_dst_locked:1;
107 __u8 icsk_retransmits;
108 __u8 icsk_pending;
109 __u8 icsk_backoff;
110 __u8 icsk_syn_retries;
111 __u8 icsk_probes_out;
112 __u16 icsk_ext_hdr_len;
113 struct {
114 __u8 pending; /* ACK is pending */
115 __u8 quick; /* Scheduled number of quick acks */
116 __u8 pingpong; /* The session is interactive */
117 __u8 blocked; /* Delayed ACK was blocked by socket lock */
118 __u32 ato; /* Predicted tick of soft clock */
119 unsigned long timeout; /* Currently scheduled timeout */
120 __u32 lrcvtime; /* timestamp of last received data packet */
121 __u16 last_seg_size; /* Size of last incoming segment */
122 __u16 rcv_mss; /* MSS used for delayed ACK decisions */
123 } icsk_ack;
124 struct {
125 int enabled;
126
127 /* Range of MTUs to search */
128 int search_high;
129 int search_low;
130
131 /* Information on the current probe. */
132 int probe_size;
133
134 u32 probe_timestamp;
135 } icsk_mtup;
136 u32 icsk_user_timeout;
137
138 u64 icsk_ca_priv[104 / sizeof(u64)];
139#define ICSK_CA_PRIV_SIZE (13 * sizeof(u64))
140};
141
142#define ICSK_TIME_RETRANS 1 /* Retransmit timer */
143#define ICSK_TIME_DACK 2 /* Delayed ack timer */
144#define ICSK_TIME_PROBE0 3 /* Zero window probe timer */
145#define ICSK_TIME_EARLY_RETRANS 4 /* Early retransmit timer */
146#define ICSK_TIME_LOSS_PROBE 5 /* Tail loss probe timer */
147#define ICSK_TIME_REO_TIMEOUT 6 /* Reordering timer */
148
149static inline struct inet_connection_sock *inet_csk(const struct sock *sk)
150{
151 return (struct inet_connection_sock *)sk;
152}
153
154static inline void *inet_csk_ca(const struct sock *sk)
155{
156 return (void *)inet_csk(sk)->icsk_ca_priv;
157}
158
159struct sock *inet_csk_clone_lock(const struct sock *sk,
160 const struct request_sock *req,
161 const gfp_t priority);
162
163enum inet_csk_ack_state_t {
164 ICSK_ACK_SCHED = 1,
165 ICSK_ACK_TIMER = 2,
166 ICSK_ACK_PUSHED = 4,
167 ICSK_ACK_PUSHED2 = 8,
168 ICSK_ACK_NOW = 16 /* Send the next ACK immediately (once) */
169};
170
171void inet_csk_init_xmit_timers(struct sock *sk,
172 void (*retransmit_handler)(struct timer_list *),
173 void (*delack_handler)(struct timer_list *),
174 void (*keepalive_handler)(struct timer_list *));
175void inet_csk_clear_xmit_timers(struct sock *sk);
176
177static inline void inet_csk_schedule_ack(struct sock *sk)
178{
179 inet_csk(sk)->icsk_ack.pending |= ICSK_ACK_SCHED;
180}
181
182static inline int inet_csk_ack_scheduled(const struct sock *sk)
183{
184 return inet_csk(sk)->icsk_ack.pending & ICSK_ACK_SCHED;
185}
186
187static 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
192void inet_csk_delete_keepalive_timer(struct sock *sk);
193void inet_csk_reset_keepalive_timer(struct sock *sk, unsigned long timeout);
194
195static inline void inet_csk_clear_xmit_timer(struct sock *sk, const int what)
196{
197 struct inet_connection_sock *icsk = inet_csk(sk);
198
199 if (what == ICSK_TIME_RETRANS || what == ICSK_TIME_PROBE0) {
200 icsk->icsk_pending = 0;
201#ifdef INET_CSK_CLEAR_TIMERS
202 sk_stop_timer(sk, &icsk->icsk_retransmit_timer);
203#endif
204 } else if (what == ICSK_TIME_DACK) {
205 icsk->icsk_ack.blocked = icsk->icsk_ack.pending = 0;
206#ifdef INET_CSK_CLEAR_TIMERS
207 sk_stop_timer(sk, &icsk->icsk_delack_timer);
208#endif
209 } else {
210 pr_debug("inet_csk BUG: unknown timer value\n");
211 }
212}
213
214/*
215 * Reset the retransmission timer
216 */
217static inline void inet_csk_reset_xmit_timer(struct sock *sk, const int what,
218 unsigned long when,
219 const unsigned long max_when)
220{
221 struct inet_connection_sock *icsk = inet_csk(sk);
222
223 if (when > max_when) {
224 pr_debug("reset_xmit_timer: sk=%p %d when=0x%lx, caller=%p\n",
225 sk, what, when, (void *)_THIS_IP_);
226 when = max_when;
227 }
228
229 if (what == ICSK_TIME_RETRANS || what == ICSK_TIME_PROBE0 ||
230 what == ICSK_TIME_EARLY_RETRANS || what == ICSK_TIME_LOSS_PROBE ||
231 what == ICSK_TIME_REO_TIMEOUT) {
232 icsk->icsk_pending = what;
233 icsk->icsk_timeout = jiffies + when;
234 sk_reset_timer(sk, &icsk->icsk_retransmit_timer, icsk->icsk_timeout);
235 } else if (what == ICSK_TIME_DACK) {
236 icsk->icsk_ack.pending |= ICSK_ACK_TIMER;
237 icsk->icsk_ack.timeout = jiffies + when;
238 sk_reset_timer(sk, &icsk->icsk_delack_timer, icsk->icsk_ack.timeout);
239 } else {
240 pr_debug("inet_csk BUG: unknown timer value\n");
241 }
242}
243
244static inline unsigned long
245inet_csk_rto_backoff(const struct inet_connection_sock *icsk,
246 unsigned long max_when)
247{
248 u64 when = (u64)icsk->icsk_rto << icsk->icsk_backoff;
249
250 return (unsigned long)min_t(u64, when, max_when);
251}
252
253struct sock *inet_csk_accept(struct sock *sk, int flags, int *err, bool kern);
254
255int inet_csk_get_port(struct sock *sk, unsigned short snum);
256
257struct dst_entry *inet_csk_route_req(const struct sock *sk, struct flowi4 *fl4,
258 const struct request_sock *req);
259struct dst_entry *inet_csk_route_child_sock(const struct sock *sk,
260 struct sock *newsk,
261 const struct request_sock *req);
262
263struct sock *inet_csk_reqsk_queue_add(struct sock *sk,
264 struct request_sock *req,
265 struct sock *child);
266void inet_csk_reqsk_queue_hash_add(struct sock *sk, struct request_sock *req,
267 unsigned long timeout);
268struct sock *inet_csk_complete_hashdance(struct sock *sk, struct sock *child,
269 struct request_sock *req,
270 bool own_req);
271
272static inline void inet_csk_reqsk_queue_added(struct sock *sk)
273{
274 reqsk_queue_added(&inet_csk(sk)->icsk_accept_queue);
275}
276
277static inline int inet_csk_reqsk_queue_len(const struct sock *sk)
278{
279 return reqsk_queue_len(&inet_csk(sk)->icsk_accept_queue);
280}
281
282static inline int inet_csk_reqsk_queue_is_full(const struct sock *sk)
283{
284 return inet_csk_reqsk_queue_len(sk) >= sk->sk_max_ack_backlog;
285}
286
287void inet_csk_reqsk_queue_drop(struct sock *sk, struct request_sock *req);
288void inet_csk_reqsk_queue_drop_and_put(struct sock *sk, struct request_sock *req);
289
290void inet_csk_destroy_sock(struct sock *sk);
291void inet_csk_prepare_forced_close(struct sock *sk);
292
293/*
294 * LISTEN is a special case for poll..
295 */
296static inline __poll_t inet_csk_listen_poll(const struct sock *sk)
297{
298 return !reqsk_queue_empty(&inet_csk(sk)->icsk_accept_queue) ?
299 (EPOLLIN | EPOLLRDNORM) : 0;
300}
301
302int inet_csk_listen_start(struct sock *sk, int backlog);
303void inet_csk_listen_stop(struct sock *sk);
304
305void inet_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr);
306
307int inet_csk_compat_getsockopt(struct sock *sk, int level, int optname,
308 char __user *optval, int __user *optlen);
309int inet_csk_compat_setsockopt(struct sock *sk, int level, int optname,
310 char __user *optval, unsigned int optlen);
311
312struct dst_entry *inet_csk_update_pmtu(struct sock *sk, u32 mtu);
313
314#define TCP_PINGPONG_THRESH 3
315
316static inline void inet_csk_enter_pingpong_mode(struct sock *sk)
317{
318 inet_csk(sk)->icsk_ack.pingpong = TCP_PINGPONG_THRESH;
319}
320
321static inline void inet_csk_exit_pingpong_mode(struct sock *sk)
322{
323 inet_csk(sk)->icsk_ack.pingpong = 0;
324}
325
326static inline bool inet_csk_in_pingpong_mode(struct sock *sk)
327{
328 return inet_csk(sk)->icsk_ack.pingpong >= TCP_PINGPONG_THRESH;
329}
330
331static inline void inet_csk_inc_pingpong_cnt(struct sock *sk)
332{
333 struct inet_connection_sock *icsk = inet_csk(sk);
334
335 if (icsk->icsk_ack.pingpong < U8_MAX)
336 icsk->icsk_ack.pingpong++;
337}
338#endif /* _INET_CONNECTION_SOCK_H */