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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 */
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 int (*bind_conflict)(const struct sock *sk,
66 const struct inet_bind_bucket *tb,
67 bool relax, bool soreuseport_ok);
68 void (*mtu_reduced)(struct sock *sk);
69};
70
71/** inet_connection_sock - INET connection oriented sock
72 *
73 * @icsk_accept_queue: FIFO of established children
74 * @icsk_bind_hash: Bind node
75 * @icsk_timeout: Timeout
76 * @icsk_retransmit_timer: Resend (no ack)
77 * @icsk_rto: Retransmit timeout
78 * @icsk_pmtu_cookie Last pmtu seen by socket
79 * @icsk_ca_ops Pluggable congestion control hook
80 * @icsk_af_ops Operations which are AF_INET{4,6} specific
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 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[88 / sizeof(u64)];
139#define ICSK_CA_PRIV_SIZE (11 * 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
148static inline struct inet_connection_sock *inet_csk(const struct sock *sk)
149{
150 return (struct inet_connection_sock *)sk;
151}
152
153static inline void *inet_csk_ca(const struct sock *sk)
154{
155 return (void *)inet_csk(sk)->icsk_ca_priv;
156}
157
158struct sock *inet_csk_clone_lock(const struct sock *sk,
159 const struct request_sock *req,
160 const gfp_t priority);
161
162enum inet_csk_ack_state_t {
163 ICSK_ACK_SCHED = 1,
164 ICSK_ACK_TIMER = 2,
165 ICSK_ACK_PUSHED = 4,
166 ICSK_ACK_PUSHED2 = 8
167};
168
169void inet_csk_init_xmit_timers(struct sock *sk,
170 void (*retransmit_handler)(unsigned long),
171 void (*delack_handler)(unsigned long),
172 void (*keepalive_handler)(unsigned long));
173void inet_csk_clear_xmit_timers(struct sock *sk);
174
175static inline void inet_csk_schedule_ack(struct sock *sk)
176{
177 inet_csk(sk)->icsk_ack.pending |= ICSK_ACK_SCHED;
178}
179
180static inline int inet_csk_ack_scheduled(const struct sock *sk)
181{
182 return inet_csk(sk)->icsk_ack.pending & ICSK_ACK_SCHED;
183}
184
185static inline void inet_csk_delack_init(struct sock *sk)
186{
187 memset(&inet_csk(sk)->icsk_ack, 0, sizeof(inet_csk(sk)->icsk_ack));
188}
189
190void inet_csk_delete_keepalive_timer(struct sock *sk);
191void inet_csk_reset_keepalive_timer(struct sock *sk, unsigned long timeout);
192
193#ifdef INET_CSK_DEBUG
194extern const char inet_csk_timer_bug_msg[];
195#endif
196
197static inline void inet_csk_clear_xmit_timer(struct sock *sk, const int what)
198{
199 struct inet_connection_sock *icsk = inet_csk(sk);
200
201 if (what == ICSK_TIME_RETRANS || what == ICSK_TIME_PROBE0) {
202 icsk->icsk_pending = 0;
203#ifdef INET_CSK_CLEAR_TIMERS
204 sk_stop_timer(sk, &icsk->icsk_retransmit_timer);
205#endif
206 } else if (what == ICSK_TIME_DACK) {
207 icsk->icsk_ack.blocked = icsk->icsk_ack.pending = 0;
208#ifdef INET_CSK_CLEAR_TIMERS
209 sk_stop_timer(sk, &icsk->icsk_delack_timer);
210#endif
211 }
212#ifdef INET_CSK_DEBUG
213 else {
214 pr_debug("%s", inet_csk_timer_bug_msg);
215 }
216#endif
217}
218
219/*
220 * Reset the retransmission timer
221 */
222static inline void inet_csk_reset_xmit_timer(struct sock *sk, const int what,
223 unsigned long when,
224 const unsigned long max_when)
225{
226 struct inet_connection_sock *icsk = inet_csk(sk);
227
228 if (when > max_when) {
229#ifdef INET_CSK_DEBUG
230 pr_debug("reset_xmit_timer: sk=%p %d when=0x%lx, caller=%p\n",
231 sk, what, when, current_text_addr());
232#endif
233 when = max_when;
234 }
235
236 if (what == ICSK_TIME_RETRANS || what == ICSK_TIME_PROBE0 ||
237 what == ICSK_TIME_EARLY_RETRANS || what == ICSK_TIME_LOSS_PROBE) {
238 icsk->icsk_pending = what;
239 icsk->icsk_timeout = jiffies + when;
240 sk_reset_timer(sk, &icsk->icsk_retransmit_timer, icsk->icsk_timeout);
241 } else if (what == ICSK_TIME_DACK) {
242 icsk->icsk_ack.pending |= ICSK_ACK_TIMER;
243 icsk->icsk_ack.timeout = jiffies + when;
244 sk_reset_timer(sk, &icsk->icsk_delack_timer, icsk->icsk_ack.timeout);
245 }
246#ifdef INET_CSK_DEBUG
247 else {
248 pr_debug("%s", inet_csk_timer_bug_msg);
249 }
250#endif
251}
252
253static inline unsigned long
254inet_csk_rto_backoff(const struct inet_connection_sock *icsk,
255 unsigned long max_when)
256{
257 u64 when = (u64)icsk->icsk_rto << icsk->icsk_backoff;
258
259 return (unsigned long)min_t(u64, when, max_when);
260}
261
262struct sock *inet_csk_accept(struct sock *sk, int flags, int *err);
263
264int inet_csk_bind_conflict(const struct sock *sk,
265 const struct inet_bind_bucket *tb, bool relax,
266 bool soreuseport_ok);
267int inet_csk_get_port(struct sock *sk, unsigned short snum);
268
269struct dst_entry *inet_csk_route_req(const struct sock *sk, struct flowi4 *fl4,
270 const struct request_sock *req);
271struct dst_entry *inet_csk_route_child_sock(const struct sock *sk,
272 struct sock *newsk,
273 const struct request_sock *req);
274
275struct sock *inet_csk_reqsk_queue_add(struct sock *sk,
276 struct request_sock *req,
277 struct sock *child);
278void inet_csk_reqsk_queue_hash_add(struct sock *sk, struct request_sock *req,
279 unsigned long timeout);
280struct sock *inet_csk_complete_hashdance(struct sock *sk, struct sock *child,
281 struct request_sock *req,
282 bool own_req);
283
284static inline void inet_csk_reqsk_queue_added(struct sock *sk)
285{
286 reqsk_queue_added(&inet_csk(sk)->icsk_accept_queue);
287}
288
289static 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
294static 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
299void inet_csk_reqsk_queue_drop(struct sock *sk, struct request_sock *req);
300void inet_csk_reqsk_queue_drop_and_put(struct sock *sk, struct request_sock *req);
301
302void inet_csk_destroy_sock(struct sock *sk);
303void inet_csk_prepare_forced_close(struct sock *sk);
304
305/*
306 * LISTEN is a special case for poll..
307 */
308static 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
314int inet_csk_listen_start(struct sock *sk, int backlog);
315void inet_csk_listen_stop(struct sock *sk);
316
317void inet_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr);
318
319int inet_csk_compat_getsockopt(struct sock *sk, int level, int optname,
320 char __user *optval, int __user *optlen);
321int inet_csk_compat_setsockopt(struct sock *sk, int level, int optname,
322 char __user *optval, unsigned int optlen);
323
324struct dst_entry *inet_csk_update_pmtu(struct sock *sk, u32 mtu);
325#endif /* _INET_CONNECTION_SOCK_H */