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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 tcp_congestion_ops;
29
30/*
31 * Pointers to address related TCP functions
32 * (i.e. things that depend on the address family)
33 */
34struct inet_connection_sock_af_ops {
35 int (*queue_xmit)(struct sock *sk, struct sk_buff *skb, struct flowi *fl);
36 void (*send_check)(struct sock *sk, struct sk_buff *skb);
37 int (*rebuild_header)(struct sock *sk);
38 void (*sk_rx_dst_set)(struct sock *sk, const struct sk_buff *skb);
39 int (*conn_request)(struct sock *sk, struct sk_buff *skb);
40 struct sock *(*syn_recv_sock)(const struct sock *sk, struct sk_buff *skb,
41 struct request_sock *req,
42 struct dst_entry *dst,
43 struct request_sock *req_unhash,
44 bool *own_req);
45 u16 net_header_len;
46 u16 net_frag_header_len;
47 u16 sockaddr_len;
48 int (*setsockopt)(struct sock *sk, int level, int optname,
49 sockptr_t optval, unsigned int optlen);
50 int (*getsockopt)(struct sock *sk, int level, int optname,
51 char __user *optval, int __user *optlen);
52 void (*addr2sockaddr)(struct sock *sk, struct sockaddr *);
53 void (*mtu_reduced)(struct sock *sk);
54};
55
56/** inet_connection_sock - INET connection oriented sock
57 *
58 * @icsk_accept_queue: FIFO of established children
59 * @icsk_bind_hash: Bind node
60 * @icsk_timeout: Timeout
61 * @icsk_retransmit_timer: Resend (no ack)
62 * @icsk_rto: Retransmit timeout
63 * @icsk_pmtu_cookie Last pmtu seen by socket
64 * @icsk_ca_ops Pluggable congestion control hook
65 * @icsk_af_ops Operations which are AF_INET{4,6} specific
66 * @icsk_ulp_ops Pluggable ULP control hook
67 * @icsk_ulp_data ULP private data
68 * @icsk_clean_acked Clean acked data hook
69 * @icsk_listen_portaddr_node hash to the portaddr listener hashtable
70 * @icsk_ca_state: Congestion control state
71 * @icsk_retransmits: Number of unrecovered [RTO] timeouts
72 * @icsk_pending: Scheduled timer event
73 * @icsk_backoff: Backoff
74 * @icsk_syn_retries: Number of allowed SYN (or equivalent) retries
75 * @icsk_probes_out: unanswered 0 window probes
76 * @icsk_ext_hdr_len: Network protocol overhead (IP/IPv6 options)
77 * @icsk_ack: Delayed ACK control data
78 * @icsk_mtup; MTU probing control data
79 */
80struct inet_connection_sock {
81 /* inet_sock has to be the first member! */
82 struct inet_sock icsk_inet;
83 struct request_sock_queue icsk_accept_queue;
84 struct inet_bind_bucket *icsk_bind_hash;
85 unsigned long icsk_timeout;
86 struct timer_list icsk_retransmit_timer;
87 struct timer_list icsk_delack_timer;
88 __u32 icsk_rto;
89 __u32 icsk_pmtu_cookie;
90 const struct tcp_congestion_ops *icsk_ca_ops;
91 const struct inet_connection_sock_af_ops *icsk_af_ops;
92 const struct tcp_ulp_ops *icsk_ulp_ops;
93 void __rcu *icsk_ulp_data;
94 void (*icsk_clean_acked)(struct sock *sk, u32 acked_seq);
95 struct hlist_node icsk_listen_portaddr_node;
96 unsigned int (*icsk_sync_mss)(struct sock *sk, u32 pmtu);
97 __u8 icsk_ca_state:6,
98 icsk_ca_setsockopt:1,
99 icsk_ca_dst_locked:1;
100 __u8 icsk_retransmits;
101 __u8 icsk_pending;
102 __u8 icsk_backoff;
103 __u8 icsk_syn_retries;
104 __u8 icsk_probes_out;
105 __u16 icsk_ext_hdr_len;
106 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;
117 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;
126
127 u32 probe_timestamp;
128 } icsk_mtup;
129 u32 icsk_user_timeout;
130
131 u64 icsk_ca_priv[104 / sizeof(u64)];
132#define ICSK_CA_PRIV_SIZE (13 * sizeof(u64))
133};
134
135#define ICSK_TIME_RETRANS 1 /* Retransmit timer */
136#define ICSK_TIME_DACK 2 /* Delayed ack timer */
137#define ICSK_TIME_PROBE0 3 /* Zero window probe timer */
138#define ICSK_TIME_EARLY_RETRANS 4 /* Early retransmit timer */
139#define ICSK_TIME_LOSS_PROBE 5 /* Tail loss probe timer */
140#define ICSK_TIME_REO_TIMEOUT 6 /* Reordering timer */
141
142static inline struct inet_connection_sock *inet_csk(const struct sock *sk)
143{
144 return (struct inet_connection_sock *)sk;
145}
146
147static inline void *inet_csk_ca(const struct sock *sk)
148{
149 return (void *)inet_csk(sk)->icsk_ca_priv;
150}
151
152struct sock *inet_csk_clone_lock(const struct sock *sk,
153 const struct request_sock *req,
154 const gfp_t priority);
155
156enum inet_csk_ack_state_t {
157 ICSK_ACK_SCHED = 1,
158 ICSK_ACK_TIMER = 2,
159 ICSK_ACK_PUSHED = 4,
160 ICSK_ACK_PUSHED2 = 8,
161 ICSK_ACK_NOW = 16 /* Send the next ACK immediately (once) */
162};
163
164void inet_csk_init_xmit_timers(struct sock *sk,
165 void (*retransmit_handler)(struct timer_list *),
166 void (*delack_handler)(struct timer_list *),
167 void (*keepalive_handler)(struct timer_list *));
168void inet_csk_clear_xmit_timers(struct sock *sk);
169
170static inline void inet_csk_schedule_ack(struct sock *sk)
171{
172 inet_csk(sk)->icsk_ack.pending |= ICSK_ACK_SCHED;
173}
174
175static inline int inet_csk_ack_scheduled(const struct sock *sk)
176{
177 return inet_csk(sk)->icsk_ack.pending & ICSK_ACK_SCHED;
178}
179
180static inline void inet_csk_delack_init(struct sock *sk)
181{
182 memset(&inet_csk(sk)->icsk_ack, 0, sizeof(inet_csk(sk)->icsk_ack));
183}
184
185void inet_csk_delete_keepalive_timer(struct sock *sk);
186void inet_csk_reset_keepalive_timer(struct sock *sk, unsigned long timeout);
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 } else {
203 pr_debug("inet_csk BUG: unknown timer value\n");
204 }
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 pr_debug("reset_xmit_timer: sk=%p %d when=0x%lx, caller=%p\n",
218 sk, what, when, (void *)_THIS_IP_);
219 when = max_when;
220 }
221
222 if (what == ICSK_TIME_RETRANS || what == ICSK_TIME_PROBE0 ||
223 what == ICSK_TIME_EARLY_RETRANS || what == ICSK_TIME_LOSS_PROBE ||
224 what == ICSK_TIME_REO_TIMEOUT) {
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 } else {
233 pr_debug("inet_csk BUG: unknown timer value\n");
234 }
235}
236
237static inline unsigned long
238inet_csk_rto_backoff(const struct inet_connection_sock *icsk,
239 unsigned long max_when)
240{
241 u64 when = (u64)icsk->icsk_rto << icsk->icsk_backoff;
242
243 return (unsigned long)min_t(u64, when, max_when);
244}
245
246struct sock *inet_csk_accept(struct sock *sk, int flags, int *err, bool kern);
247
248int inet_csk_get_port(struct sock *sk, unsigned short snum);
249
250struct dst_entry *inet_csk_route_req(const struct sock *sk, struct flowi4 *fl4,
251 const struct request_sock *req);
252struct dst_entry *inet_csk_route_child_sock(const struct sock *sk,
253 struct sock *newsk,
254 const struct request_sock *req);
255
256struct sock *inet_csk_reqsk_queue_add(struct sock *sk,
257 struct request_sock *req,
258 struct sock *child);
259void inet_csk_reqsk_queue_hash_add(struct sock *sk, struct request_sock *req,
260 unsigned long timeout);
261struct sock *inet_csk_complete_hashdance(struct sock *sk, struct sock *child,
262 struct request_sock *req,
263 bool own_req);
264
265static inline void inet_csk_reqsk_queue_added(struct sock *sk)
266{
267 reqsk_queue_added(&inet_csk(sk)->icsk_accept_queue);
268}
269
270static inline int inet_csk_reqsk_queue_len(const struct sock *sk)
271{
272 return reqsk_queue_len(&inet_csk(sk)->icsk_accept_queue);
273}
274
275static inline int inet_csk_reqsk_queue_is_full(const struct sock *sk)
276{
277 return inet_csk_reqsk_queue_len(sk) >= sk->sk_max_ack_backlog;
278}
279
280void inet_csk_reqsk_queue_drop(struct sock *sk, struct request_sock *req);
281void inet_csk_reqsk_queue_drop_and_put(struct sock *sk, struct request_sock *req);
282
283static inline void inet_csk_prepare_for_destroy_sock(struct sock *sk)
284{
285 /* The below has to be done to allow calling inet_csk_destroy_sock */
286 sock_set_flag(sk, SOCK_DEAD);
287 percpu_counter_inc(sk->sk_prot->orphan_count);
288}
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
307/* update the fast reuse flag when adding a socket */
308void inet_csk_update_fastreuse(struct inet_bind_bucket *tb,
309 struct sock *sk);
310
311struct dst_entry *inet_csk_update_pmtu(struct sock *sk, u32 mtu);
312
313#define TCP_PINGPONG_THRESH 3
314
315static inline void inet_csk_enter_pingpong_mode(struct sock *sk)
316{
317 inet_csk(sk)->icsk_ack.pingpong = TCP_PINGPONG_THRESH;
318}
319
320static inline void inet_csk_exit_pingpong_mode(struct sock *sk)
321{
322 inet_csk(sk)->icsk_ack.pingpong = 0;
323}
324
325static inline bool inet_csk_in_pingpong_mode(struct sock *sk)
326{
327 return inet_csk(sk)->icsk_ack.pingpong >= TCP_PINGPONG_THRESH;
328}
329
330static inline void inet_csk_inc_pingpong_cnt(struct sock *sk)
331{
332 struct inet_connection_sock *icsk = inet_csk(sk);
333
334 if (icsk->icsk_ack.pingpong < U8_MAX)
335 icsk->icsk_ack.pingpong++;
336}
337
338static inline bool inet_csk_has_ulp(struct sock *sk)
339{
340 return inet_sk(sk)->is_icsk && !!inet_csk(sk)->icsk_ulp_ops;
341}
342
343#endif /* _INET_CONNECTION_SOCK_H */