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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)(struct sock *sk, struct sk_buff *skb,
45 struct request_sock *req,
46 struct dst_entry *dst);
47 u16 net_header_len;
48 u16 net_frag_header_len;
49 u16 sockaddr_len;
50 int (*setsockopt)(struct sock *sk, int level, int optname,
51 char __user *optval, unsigned int optlen);
52 int (*getsockopt)(struct sock *sk, int level, int optname,
53 char __user *optval, int __user *optlen);
54#ifdef CONFIG_COMPAT
55 int (*compat_setsockopt)(struct sock *sk,
56 int level, int optname,
57 char __user *optval, unsigned int optlen);
58 int (*compat_getsockopt)(struct sock *sk,
59 int level, int optname,
60 char __user *optval, int __user *optlen);
61#endif
62 void (*addr2sockaddr)(struct sock *sk, struct sockaddr *);
63 int (*bind_conflict)(const struct sock *sk,
64 const struct inet_bind_bucket *tb, bool relax);
65};
66
67/** inet_connection_sock - INET connection oriented sock
68 *
69 * @icsk_accept_queue: FIFO of established children
70 * @icsk_bind_hash: Bind node
71 * @icsk_timeout: Timeout
72 * @icsk_retransmit_timer: Resend (no ack)
73 * @icsk_rto: Retransmit timeout
74 * @icsk_pmtu_cookie Last pmtu seen by socket
75 * @icsk_ca_ops Pluggable congestion control hook
76 * @icsk_af_ops Operations which are AF_INET{4,6} specific
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 unsigned int (*icsk_sync_mss)(struct sock *sk, u32 pmtu);
100 __u8 icsk_ca_state;
101 __u8 icsk_retransmits;
102 __u8 icsk_pending;
103 __u8 icsk_backoff;
104 __u8 icsk_syn_retries;
105 __u8 icsk_probes_out;
106 __u16 icsk_ext_hdr_len;
107 struct {
108 __u8 pending; /* ACK is pending */
109 __u8 quick; /* Scheduled number of quick acks */
110 __u8 pingpong; /* The session is interactive */
111 __u8 blocked; /* Delayed ACK was blocked by socket lock */
112 __u32 ato; /* Predicted tick of soft clock */
113 unsigned long timeout; /* Currently scheduled timeout */
114 __u32 lrcvtime; /* timestamp of last received data packet */
115 __u16 last_seg_size; /* Size of last incoming segment */
116 __u16 rcv_mss; /* MSS used for delayed ACK decisions */
117 } icsk_ack;
118 struct {
119 int enabled;
120
121 /* Range of MTUs to search */
122 int search_high;
123 int search_low;
124
125 /* Information on the current probe. */
126 int probe_size;
127 } icsk_mtup;
128 u32 icsk_ca_priv[16];
129 u32 icsk_user_timeout;
130#define ICSK_CA_PRIV_SIZE (16 * sizeof(u32))
131};
132
133#define ICSK_TIME_RETRANS 1 /* Retransmit timer */
134#define ICSK_TIME_DACK 2 /* Delayed ack timer */
135#define ICSK_TIME_PROBE0 3 /* Zero window probe timer */
136#define ICSK_TIME_EARLY_RETRANS 4 /* Early retransmit timer */
137#define ICSK_TIME_LOSS_PROBE 5 /* Tail loss probe timer */
138
139static inline struct inet_connection_sock *inet_csk(const struct sock *sk)
140{
141 return (struct inet_connection_sock *)sk;
142}
143
144static inline void *inet_csk_ca(const struct sock *sk)
145{
146 return (void *)inet_csk(sk)->icsk_ca_priv;
147}
148
149struct sock *inet_csk_clone_lock(const struct sock *sk,
150 const struct request_sock *req,
151 const gfp_t priority);
152
153enum inet_csk_ack_state_t {
154 ICSK_ACK_SCHED = 1,
155 ICSK_ACK_TIMER = 2,
156 ICSK_ACK_PUSHED = 4,
157 ICSK_ACK_PUSHED2 = 8
158};
159
160void inet_csk_init_xmit_timers(struct sock *sk,
161 void (*retransmit_handler)(unsigned long),
162 void (*delack_handler)(unsigned long),
163 void (*keepalive_handler)(unsigned long));
164void inet_csk_clear_xmit_timers(struct sock *sk);
165
166static inline void inet_csk_schedule_ack(struct sock *sk)
167{
168 inet_csk(sk)->icsk_ack.pending |= ICSK_ACK_SCHED;
169}
170
171static inline int inet_csk_ack_scheduled(const struct sock *sk)
172{
173 return inet_csk(sk)->icsk_ack.pending & ICSK_ACK_SCHED;
174}
175
176static inline void inet_csk_delack_init(struct sock *sk)
177{
178 memset(&inet_csk(sk)->icsk_ack, 0, sizeof(inet_csk(sk)->icsk_ack));
179}
180
181void inet_csk_delete_keepalive_timer(struct sock *sk);
182void inet_csk_reset_keepalive_timer(struct sock *sk, unsigned long timeout);
183
184#ifdef INET_CSK_DEBUG
185extern const char inet_csk_timer_bug_msg[];
186#endif
187
188static inline void inet_csk_clear_xmit_timer(struct sock *sk, const int what)
189{
190 struct inet_connection_sock *icsk = inet_csk(sk);
191
192 if (what == ICSK_TIME_RETRANS || what == ICSK_TIME_PROBE0) {
193 icsk->icsk_pending = 0;
194#ifdef INET_CSK_CLEAR_TIMERS
195 sk_stop_timer(sk, &icsk->icsk_retransmit_timer);
196#endif
197 } else if (what == ICSK_TIME_DACK) {
198 icsk->icsk_ack.blocked = icsk->icsk_ack.pending = 0;
199#ifdef INET_CSK_CLEAR_TIMERS
200 sk_stop_timer(sk, &icsk->icsk_delack_timer);
201#endif
202 }
203#ifdef INET_CSK_DEBUG
204 else {
205 pr_debug("%s", inet_csk_timer_bug_msg);
206 }
207#endif
208}
209
210/*
211 * Reset the retransmission timer
212 */
213static inline void inet_csk_reset_xmit_timer(struct sock *sk, const int what,
214 unsigned long when,
215 const unsigned long max_when)
216{
217 struct inet_connection_sock *icsk = inet_csk(sk);
218
219 if (when > max_when) {
220#ifdef INET_CSK_DEBUG
221 pr_debug("reset_xmit_timer: sk=%p %d when=0x%lx, caller=%p\n",
222 sk, what, when, current_text_addr());
223#endif
224 when = max_when;
225 }
226
227 if (what == ICSK_TIME_RETRANS || what == ICSK_TIME_PROBE0 ||
228 what == ICSK_TIME_EARLY_RETRANS || what == ICSK_TIME_LOSS_PROBE) {
229 icsk->icsk_pending = what;
230 icsk->icsk_timeout = jiffies + when;
231 sk_reset_timer(sk, &icsk->icsk_retransmit_timer, icsk->icsk_timeout);
232 } else if (what == ICSK_TIME_DACK) {
233 icsk->icsk_ack.pending |= ICSK_ACK_TIMER;
234 icsk->icsk_ack.timeout = jiffies + when;
235 sk_reset_timer(sk, &icsk->icsk_delack_timer, icsk->icsk_ack.timeout);
236 }
237#ifdef INET_CSK_DEBUG
238 else {
239 pr_debug("%s", inet_csk_timer_bug_msg);
240 }
241#endif
242}
243
244struct sock *inet_csk_accept(struct sock *sk, int flags, int *err);
245
246struct request_sock *inet_csk_search_req(const struct sock *sk,
247 struct request_sock ***prevp,
248 const __be16 rport,
249 const __be32 raddr,
250 const __be32 laddr);
251int inet_csk_bind_conflict(const struct sock *sk,
252 const struct inet_bind_bucket *tb, bool relax);
253int inet_csk_get_port(struct sock *sk, unsigned short snum);
254
255struct dst_entry *inet_csk_route_req(struct sock *sk, struct flowi4 *fl4,
256 const struct request_sock *req);
257struct dst_entry *inet_csk_route_child_sock(struct sock *sk, struct sock *newsk,
258 const struct request_sock *req);
259
260static inline void inet_csk_reqsk_queue_add(struct sock *sk,
261 struct request_sock *req,
262 struct sock *child)
263{
264 reqsk_queue_add(&inet_csk(sk)->icsk_accept_queue, req, sk, child);
265}
266
267void inet_csk_reqsk_queue_hash_add(struct sock *sk, struct request_sock *req,
268 unsigned long timeout);
269
270static inline void inet_csk_reqsk_queue_removed(struct sock *sk,
271 struct request_sock *req)
272{
273 if (reqsk_queue_removed(&inet_csk(sk)->icsk_accept_queue, req) == 0)
274 inet_csk_delete_keepalive_timer(sk);
275}
276
277static inline void inet_csk_reqsk_queue_added(struct sock *sk,
278 const unsigned long timeout)
279{
280 if (reqsk_queue_added(&inet_csk(sk)->icsk_accept_queue) == 0)
281 inet_csk_reset_keepalive_timer(sk, timeout);
282}
283
284static inline int inet_csk_reqsk_queue_len(const struct sock *sk)
285{
286 return reqsk_queue_len(&inet_csk(sk)->icsk_accept_queue);
287}
288
289static inline int inet_csk_reqsk_queue_young(const struct sock *sk)
290{
291 return reqsk_queue_len_young(&inet_csk(sk)->icsk_accept_queue);
292}
293
294static inline int inet_csk_reqsk_queue_is_full(const struct sock *sk)
295{
296 return reqsk_queue_is_full(&inet_csk(sk)->icsk_accept_queue);
297}
298
299static inline void inet_csk_reqsk_queue_unlink(struct sock *sk,
300 struct request_sock *req,
301 struct request_sock **prev)
302{
303 reqsk_queue_unlink(&inet_csk(sk)->icsk_accept_queue, req, prev);
304}
305
306static inline void inet_csk_reqsk_queue_drop(struct sock *sk,
307 struct request_sock *req,
308 struct request_sock **prev)
309{
310 inet_csk_reqsk_queue_unlink(sk, req, prev);
311 inet_csk_reqsk_queue_removed(sk, req);
312 reqsk_free(req);
313}
314
315void inet_csk_reqsk_queue_prune(struct sock *parent,
316 const unsigned long interval,
317 const unsigned long timeout,
318 const unsigned long max_rto);
319
320void inet_csk_destroy_sock(struct sock *sk);
321void inet_csk_prepare_forced_close(struct sock *sk);
322
323/*
324 * LISTEN is a special case for poll..
325 */
326static inline unsigned int inet_csk_listen_poll(const struct sock *sk)
327{
328 return !reqsk_queue_empty(&inet_csk(sk)->icsk_accept_queue) ?
329 (POLLIN | POLLRDNORM) : 0;
330}
331
332int inet_csk_listen_start(struct sock *sk, const int nr_table_entries);
333void inet_csk_listen_stop(struct sock *sk);
334
335void inet_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr);
336
337int inet_csk_compat_getsockopt(struct sock *sk, int level, int optname,
338 char __user *optval, int __user *optlen);
339int inet_csk_compat_setsockopt(struct sock *sk, int level, int optname,
340 char __user *optval, unsigned int optlen);
341
342struct dst_entry *inet_csk_update_pmtu(struct sock *sk, u32 mtu);
343#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#include <linux/sockptr.h>
20
21#include <net/inet_sock.h>
22#include <net/request_sock.h>
23
24/* Cancel timers, when they are not required. */
25#undef INET_CSK_CLEAR_TIMERS
26
27struct inet_bind_bucket;
28struct inet_bind2_bucket;
29struct tcp_congestion_ops;
30
31/*
32 * Pointers to address related TCP functions
33 * (i.e. things that depend on the address family)
34 */
35struct inet_connection_sock_af_ops {
36 int (*queue_xmit)(struct sock *sk, struct sk_buff *skb, struct flowi *fl);
37 void (*send_check)(struct sock *sk, struct sk_buff *skb);
38 int (*rebuild_header)(struct sock *sk);
39 void (*sk_rx_dst_set)(struct sock *sk, const struct sk_buff *skb);
40 int (*conn_request)(struct sock *sk, struct sk_buff *skb);
41 struct sock *(*syn_recv_sock)(const struct sock *sk, struct sk_buff *skb,
42 struct request_sock *req,
43 struct dst_entry *dst,
44 struct request_sock *req_unhash,
45 bool *own_req);
46 u16 net_header_len;
47 u16 net_frag_header_len;
48 u16 sockaddr_len;
49 int (*setsockopt)(struct sock *sk, int level, int optname,
50 sockptr_t optval, unsigned int optlen);
51 int (*getsockopt)(struct sock *sk, int level, int optname,
52 char __user *optval, int __user *optlen);
53 void (*addr2sockaddr)(struct sock *sk, struct sockaddr *);
54 void (*mtu_reduced)(struct sock *sk);
55};
56
57/** inet_connection_sock - INET connection oriented sock
58 *
59 * @icsk_accept_queue: FIFO of established children
60 * @icsk_bind_hash: Bind node
61 * @icsk_bind2_hash: Bind node in the bhash2 table
62 * @icsk_timeout: Timeout
63 * @icsk_retransmit_timer: Resend (no ack)
64 * @icsk_rto: Retransmit timeout
65 * @icsk_pmtu_cookie Last pmtu seen by socket
66 * @icsk_ca_ops Pluggable congestion control hook
67 * @icsk_af_ops Operations which are AF_INET{4,6} specific
68 * @icsk_ulp_ops Pluggable ULP control hook
69 * @icsk_ulp_data ULP private data
70 * @icsk_clean_acked Clean acked data hook
71 * @icsk_ca_state: Congestion control state
72 * @icsk_retransmits: Number of unrecovered [RTO] timeouts
73 * @icsk_pending: Scheduled timer event
74 * @icsk_backoff: Backoff
75 * @icsk_syn_retries: Number of allowed SYN (or equivalent) retries
76 * @icsk_probes_out: unanswered 0 window probes
77 * @icsk_ext_hdr_len: Network protocol overhead (IP/IPv6 options)
78 * @icsk_ack: Delayed ACK control data
79 * @icsk_mtup; MTU probing control data
80 * @icsk_probes_tstamp: Probe timestamp (cleared by non-zero window ack)
81 * @icsk_user_timeout: TCP_USER_TIMEOUT value
82 */
83struct inet_connection_sock {
84 /* inet_sock has to be the first member! */
85 struct inet_sock icsk_inet;
86 struct request_sock_queue icsk_accept_queue;
87 struct inet_bind_bucket *icsk_bind_hash;
88 struct inet_bind2_bucket *icsk_bind2_hash;
89 unsigned long icsk_timeout;
90 struct timer_list icsk_retransmit_timer;
91 struct timer_list icsk_delack_timer;
92 __u32 icsk_rto;
93 __u32 icsk_rto_min;
94 __u32 icsk_delack_max;
95 __u32 icsk_pmtu_cookie;
96 const struct tcp_congestion_ops *icsk_ca_ops;
97 const struct inet_connection_sock_af_ops *icsk_af_ops;
98 const struct tcp_ulp_ops *icsk_ulp_ops;
99 void __rcu *icsk_ulp_data;
100 void (*icsk_clean_acked)(struct sock *sk, u32 acked_seq);
101 unsigned int (*icsk_sync_mss)(struct sock *sk, u32 pmtu);
102 __u8 icsk_ca_state:5,
103 icsk_ca_initialized:1,
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 retry; /* Number of attempts */
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 /* Range of MTUs to search */
125 int search_high;
126 int search_low;
127
128 /* Information on the current probe. */
129 u32 probe_size:31,
130 /* Is the MTUP feature enabled for this connection? */
131 enabled:1;
132
133 u32 probe_timestamp;
134 } icsk_mtup;
135 u32 icsk_probes_tstamp;
136 u32 icsk_user_timeout;
137
138 u64 icsk_ca_priv[104 / sizeof(u64)];
139#define ICSK_CA_PRIV_SIZE sizeof_field(struct inet_connection_sock, icsk_ca_priv)
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_LOSS_PROBE 5 /* Tail loss probe timer */
146#define ICSK_TIME_REO_TIMEOUT 6 /* Reordering 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 ICSK_ACK_NOW = 16 /* Send the next ACK immediately (once) */
168};
169
170void inet_csk_init_xmit_timers(struct sock *sk,
171 void (*retransmit_handler)(struct timer_list *),
172 void (*delack_handler)(struct timer_list *),
173 void (*keepalive_handler)(struct timer_list *));
174void inet_csk_clear_xmit_timers(struct sock *sk);
175
176static inline void inet_csk_schedule_ack(struct sock *sk)
177{
178 inet_csk(sk)->icsk_ack.pending |= ICSK_ACK_SCHED;
179}
180
181static inline int inet_csk_ack_scheduled(const struct sock *sk)
182{
183 return inet_csk(sk)->icsk_ack.pending & ICSK_ACK_SCHED;
184}
185
186static inline void inet_csk_delack_init(struct sock *sk)
187{
188 memset(&inet_csk(sk)->icsk_ack, 0, sizeof(inet_csk(sk)->icsk_ack));
189}
190
191void inet_csk_delete_keepalive_timer(struct sock *sk);
192void inet_csk_reset_keepalive_timer(struct sock *sk, unsigned long timeout);
193
194static inline void inet_csk_clear_xmit_timer(struct sock *sk, const int what)
195{
196 struct inet_connection_sock *icsk = inet_csk(sk);
197
198 if (what == ICSK_TIME_RETRANS || what == ICSK_TIME_PROBE0) {
199 icsk->icsk_pending = 0;
200#ifdef INET_CSK_CLEAR_TIMERS
201 sk_stop_timer(sk, &icsk->icsk_retransmit_timer);
202#endif
203 } else if (what == ICSK_TIME_DACK) {
204 icsk->icsk_ack.pending = 0;
205 icsk->icsk_ack.retry = 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_LOSS_PROBE || what == ICSK_TIME_REO_TIMEOUT) {
231 icsk->icsk_pending = what;
232 icsk->icsk_timeout = jiffies + when;
233 sk_reset_timer(sk, &icsk->icsk_retransmit_timer, icsk->icsk_timeout);
234 } else if (what == ICSK_TIME_DACK) {
235 icsk->icsk_ack.pending |= ICSK_ACK_TIMER;
236 icsk->icsk_ack.timeout = jiffies + when;
237 sk_reset_timer(sk, &icsk->icsk_delack_timer, icsk->icsk_ack.timeout);
238 } else {
239 pr_debug("inet_csk BUG: unknown timer value\n");
240 }
241}
242
243static inline unsigned long
244inet_csk_rto_backoff(const struct inet_connection_sock *icsk,
245 unsigned long max_when)
246{
247 u64 when = (u64)icsk->icsk_rto << icsk->icsk_backoff;
248
249 return (unsigned long)min_t(u64, when, max_when);
250}
251
252struct sock *inet_csk_accept(struct sock *sk, int flags, int *err, bool kern);
253
254int inet_csk_get_port(struct sock *sk, unsigned short snum);
255
256struct dst_entry *inet_csk_route_req(const struct sock *sk, struct flowi4 *fl4,
257 const struct request_sock *req);
258struct dst_entry *inet_csk_route_child_sock(const struct sock *sk,
259 struct sock *newsk,
260 const struct request_sock *req);
261
262struct sock *inet_csk_reqsk_queue_add(struct sock *sk,
263 struct request_sock *req,
264 struct sock *child);
265void inet_csk_reqsk_queue_hash_add(struct sock *sk, struct request_sock *req,
266 unsigned long timeout);
267struct sock *inet_csk_complete_hashdance(struct sock *sk, struct sock *child,
268 struct request_sock *req,
269 bool own_req);
270
271static inline void inet_csk_reqsk_queue_added(struct sock *sk)
272{
273 reqsk_queue_added(&inet_csk(sk)->icsk_accept_queue);
274}
275
276static inline int inet_csk_reqsk_queue_len(const struct sock *sk)
277{
278 return reqsk_queue_len(&inet_csk(sk)->icsk_accept_queue);
279}
280
281static inline int inet_csk_reqsk_queue_is_full(const struct sock *sk)
282{
283 return inet_csk_reqsk_queue_len(sk) >= sk->sk_max_ack_backlog;
284}
285
286bool inet_csk_reqsk_queue_drop(struct sock *sk, struct request_sock *req);
287void inet_csk_reqsk_queue_drop_and_put(struct sock *sk, struct request_sock *req);
288
289static inline unsigned long
290reqsk_timeout(struct request_sock *req, unsigned long max_timeout)
291{
292 u64 timeout = (u64)req->timeout << req->num_timeout;
293
294 return (unsigned long)min_t(u64, timeout, max_timeout);
295}
296
297static inline void inet_csk_prepare_for_destroy_sock(struct sock *sk)
298{
299 /* The below has to be done to allow calling inet_csk_destroy_sock */
300 sock_set_flag(sk, SOCK_DEAD);
301 this_cpu_inc(*sk->sk_prot->orphan_count);
302}
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);
317void inet_csk_listen_stop(struct sock *sk);
318
319void inet_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr);
320
321/* update the fast reuse flag when adding a socket */
322void inet_csk_update_fastreuse(struct inet_bind_bucket *tb,
323 struct sock *sk);
324
325struct dst_entry *inet_csk_update_pmtu(struct sock *sk, u32 mtu);
326
327#define TCP_PINGPONG_THRESH 1
328
329static inline void inet_csk_enter_pingpong_mode(struct sock *sk)
330{
331 inet_csk(sk)->icsk_ack.pingpong = TCP_PINGPONG_THRESH;
332}
333
334static inline void inet_csk_exit_pingpong_mode(struct sock *sk)
335{
336 inet_csk(sk)->icsk_ack.pingpong = 0;
337}
338
339static inline bool inet_csk_in_pingpong_mode(struct sock *sk)
340{
341 return inet_csk(sk)->icsk_ack.pingpong >= TCP_PINGPONG_THRESH;
342}
343
344static inline bool inet_csk_has_ulp(struct sock *sk)
345{
346 return inet_sk(sk)->is_icsk && !!inet_csk(sk)->icsk_ulp_ops;
347}
348
349#endif /* _INET_CONNECTION_SOCK_H */