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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 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 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);
46 struct inet_peer *(*get_peer)(struct sock *sk, bool *release_it);
47 u16 net_header_len;
48 u16 sockaddr_len;
49 int (*setsockopt)(struct sock *sk, int level, int optname,
50 char __user *optval, unsigned int optlen);
51 int (*getsockopt)(struct sock *sk, int level, int optname,
52 char __user *optval, int __user *optlen);
53#ifdef CONFIG_COMPAT
54 int (*compat_setsockopt)(struct sock *sk,
55 int level, int optname,
56 char __user *optval, unsigned int optlen);
57 int (*compat_getsockopt)(struct sock *sk,
58 int level, int optname,
59 char __user *optval, int __user *optlen);
60#endif
61 void (*addr2sockaddr)(struct sock *sk, struct sockaddr *);
62 int (*bind_conflict)(const struct sock *sk,
63 const struct inet_bind_bucket *tb);
64};
65
66/** 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
73 * @icsk_pmtu_cookie Last pmtu seen by socket
74 * @icsk_ca_ops Pluggable congestion control hook
75 * @icsk_af_ops Operations which are AF_INET{4,6} specific
76 * @icsk_ca_state: Congestion control state
77 * @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
81 * @icsk_probes_out: unanswered 0 window probes
82 * @icsk_ext_hdr_len: Network protocol overhead (IP/IPv6 options)
83 * @icsk_ack: Delayed ACK control data
84 * @icsk_mtup; MTU probing control data
85 */
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;
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 unsigned int (*icsk_sync_mss)(struct sock *sk, u32 pmtu);
99 __u8 icsk_ca_state;
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 } icsk_mtup;
127 u32 icsk_ca_priv[16];
128 u32 icsk_user_timeout;
129#define ICSK_CA_PRIV_SIZE (16 * sizeof(u32))
130};
131
132#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 */
135
136static inline struct inet_connection_sock *inet_csk(const struct sock *sk)
137{
138 return (struct inet_connection_sock *)sk;
139}
140
141static inline void *inet_csk_ca(const struct sock *sk)
142{
143 return (void *)inet_csk(sk)->icsk_ca_priv;
144}
145
146extern struct sock *inet_csk_clone(struct sock *sk,
147 const struct request_sock *req,
148 const gfp_t priority);
149
150enum inet_csk_ack_state_t {
151 ICSK_ACK_SCHED = 1,
152 ICSK_ACK_TIMER = 2,
153 ICSK_ACK_PUSHED = 4,
154 ICSK_ACK_PUSHED2 = 8
155};
156
157extern 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
163static 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 {
202 pr_debug("%s", inet_csk_timer_bug_msg);
203 }
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 {
235 pr_debug("%s", inet_csk_timer_bug_msg);
236 }
237#endif
238}
239
240extern struct sock *inet_csk_accept(struct sock *sk, int flags, int *err);
241
242extern struct request_sock *inet_csk_search_req(const struct sock *sk,
243 struct request_sock ***prevp,
244 const __be16 rport,
245 const __be32 raddr,
246 const __be32 laddr);
247extern int inet_csk_bind_conflict(const struct sock *sk,
248 const struct inet_bind_bucket *tb);
249extern int inet_csk_get_port(struct sock *sk, unsigned short snum);
250
251extern struct dst_entry* inet_csk_route_req(struct sock *sk,
252 struct flowi4 *fl4,
253 const struct request_sock *req);
254extern struct dst_entry* inet_csk_route_child_sock(struct sock *sk,
255 struct sock *newsk,
256 const struct request_sock *req);
257
258static 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,
267 unsigned long timeout);
268
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
314extern 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);
320
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
330extern int inet_csk_listen_start(struct sock *sk, const int nr_table_entries);
331extern void inet_csk_listen_stop(struct sock *sk);
332
333extern void inet_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr);
334
335extern 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,
338 char __user *optval, unsigned int optlen);
339#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 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_bind2_hash: Bind node in the bhash2 table
61 * @icsk_timeout: Timeout
62 * @icsk_retransmit_timer: Resend (no ack)
63 * @icsk_rto: Retransmit timeout
64 * @icsk_pmtu_cookie Last pmtu seen by socket
65 * @icsk_ca_ops Pluggable congestion control hook
66 * @icsk_af_ops Operations which are AF_INET{4,6} specific
67 * @icsk_ulp_ops Pluggable ULP control hook
68 * @icsk_ulp_data ULP private data
69 * @icsk_clean_acked Clean acked data hook
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 * @icsk_probes_tstamp: Probe timestamp (cleared by non-zero window ack)
80 * @icsk_user_timeout: TCP_USER_TIMEOUT value
81 */
82struct inet_connection_sock {
83 /* inet_sock has to be the first member! */
84 struct inet_sock icsk_inet;
85 struct request_sock_queue icsk_accept_queue;
86 struct inet_bind_bucket *icsk_bind_hash;
87 struct inet_bind2_bucket *icsk_bind2_hash;
88 unsigned long icsk_timeout;
89 struct timer_list icsk_retransmit_timer;
90 struct timer_list icsk_delack_timer;
91 __u32 icsk_rto;
92 __u32 icsk_rto_min;
93 __u32 icsk_delack_max;
94 __u32 icsk_pmtu_cookie;
95 const struct tcp_congestion_ops *icsk_ca_ops;
96 const struct inet_connection_sock_af_ops *icsk_af_ops;
97 const struct tcp_ulp_ops *icsk_ulp_ops;
98 void __rcu *icsk_ulp_data;
99 void (*icsk_clean_acked)(struct sock *sk, u32 acked_seq);
100 unsigned int (*icsk_sync_mss)(struct sock *sk, u32 pmtu);
101 __u8 icsk_ca_state:5,
102 icsk_ca_initialized:1,
103 icsk_ca_setsockopt:1,
104 icsk_ca_dst_locked:1;
105 __u8 icsk_retransmits;
106 __u8 icsk_pending;
107 __u8 icsk_backoff;
108 __u8 icsk_syn_retries;
109 __u8 icsk_probes_out;
110 __u16 icsk_ext_hdr_len;
111 struct {
112 __u8 pending; /* ACK is pending */
113 __u8 quick; /* Scheduled number of quick acks */
114 __u8 pingpong; /* The session is interactive */
115 __u8 retry; /* Number of attempts */
116 #define ATO_BITS 8
117 __u32 ato:ATO_BITS, /* Predicted tick of soft clock */
118 lrcv_flowlabel:20, /* last received ipv6 flowlabel */
119 unused:4;
120 unsigned long timeout; /* Currently scheduled timeout */
121 __u32 lrcvtime; /* timestamp of last received data packet */
122 __u16 last_seg_size; /* Size of last incoming segment */
123 __u16 rcv_mss; /* MSS used for delayed ACK decisions */
124 } icsk_ack;
125 struct {
126 /* Range of MTUs to search */
127 int search_high;
128 int search_low;
129
130 /* Information on the current probe. */
131 u32 probe_size:31,
132 /* Is the MTUP feature enabled for this connection? */
133 enabled:1;
134
135 u32 probe_timestamp;
136 } icsk_mtup;
137 u32 icsk_probes_tstamp;
138 u32 icsk_user_timeout;
139
140 u64 icsk_ca_priv[104 / sizeof(u64)];
141#define ICSK_CA_PRIV_SIZE sizeof_field(struct inet_connection_sock, icsk_ca_priv)
142};
143
144#define ICSK_TIME_RETRANS 1 /* Retransmit timer */
145#define ICSK_TIME_DACK 2 /* Delayed ack timer */
146#define ICSK_TIME_PROBE0 3 /* Zero window probe timer */
147#define ICSK_TIME_LOSS_PROBE 5 /* Tail loss probe timer */
148#define ICSK_TIME_REO_TIMEOUT 6 /* Reordering timer */
149
150static inline struct inet_connection_sock *inet_csk(const struct sock *sk)
151{
152 return (struct inet_connection_sock *)sk;
153}
154
155static inline void *inet_csk_ca(const struct sock *sk)
156{
157 return (void *)inet_csk(sk)->icsk_ca_priv;
158}
159
160struct sock *inet_csk_clone_lock(const struct sock *sk,
161 const struct request_sock *req,
162 const gfp_t priority);
163
164enum inet_csk_ack_state_t {
165 ICSK_ACK_SCHED = 1,
166 ICSK_ACK_TIMER = 2,
167 ICSK_ACK_PUSHED = 4,
168 ICSK_ACK_PUSHED2 = 8,
169 ICSK_ACK_NOW = 16, /* Send the next ACK immediately (once) */
170 ICSK_ACK_NOMEM = 32,
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
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.pending = 0;
208 icsk->icsk_ack.retry = 0;
209#ifdef INET_CSK_CLEAR_TIMERS
210 sk_stop_timer(sk, &icsk->icsk_delack_timer);
211#endif
212 } else {
213 pr_debug("inet_csk BUG: unknown timer value\n");
214 }
215}
216
217/*
218 * Reset the retransmission timer
219 */
220static inline void inet_csk_reset_xmit_timer(struct sock *sk, const int what,
221 unsigned long when,
222 const unsigned long max_when)
223{
224 struct inet_connection_sock *icsk = inet_csk(sk);
225
226 if (when > max_when) {
227 pr_debug("reset_xmit_timer: sk=%p %d when=0x%lx, caller=%p\n",
228 sk, what, when, (void *)_THIS_IP_);
229 when = max_when;
230 }
231
232 if (what == ICSK_TIME_RETRANS || what == ICSK_TIME_PROBE0 ||
233 what == ICSK_TIME_LOSS_PROBE || what == ICSK_TIME_REO_TIMEOUT) {
234 icsk->icsk_pending = what;
235 icsk->icsk_timeout = jiffies + when;
236 sk_reset_timer(sk, &icsk->icsk_retransmit_timer, icsk->icsk_timeout);
237 } else if (what == ICSK_TIME_DACK) {
238 icsk->icsk_ack.pending |= ICSK_ACK_TIMER;
239 icsk->icsk_ack.timeout = jiffies + when;
240 sk_reset_timer(sk, &icsk->icsk_delack_timer, icsk->icsk_ack.timeout);
241 } else {
242 pr_debug("inet_csk BUG: unknown timer value\n");
243 }
244}
245
246static inline unsigned long
247inet_csk_rto_backoff(const struct inet_connection_sock *icsk,
248 unsigned long max_when)
249{
250 u64 when = (u64)icsk->icsk_rto << icsk->icsk_backoff;
251
252 return (unsigned long)min_t(u64, when, max_when);
253}
254
255struct sock *inet_csk_accept(struct sock *sk, int flags, int *err, bool kern);
256
257int inet_csk_get_port(struct sock *sk, unsigned short snum);
258
259struct dst_entry *inet_csk_route_req(const struct sock *sk, struct flowi4 *fl4,
260 const struct request_sock *req);
261struct dst_entry *inet_csk_route_child_sock(const struct sock *sk,
262 struct sock *newsk,
263 const struct request_sock *req);
264
265struct sock *inet_csk_reqsk_queue_add(struct sock *sk,
266 struct request_sock *req,
267 struct sock *child);
268void inet_csk_reqsk_queue_hash_add(struct sock *sk, struct request_sock *req,
269 unsigned long timeout);
270struct sock *inet_csk_complete_hashdance(struct sock *sk, struct sock *child,
271 struct request_sock *req,
272 bool own_req);
273
274static inline void inet_csk_reqsk_queue_added(struct sock *sk)
275{
276 reqsk_queue_added(&inet_csk(sk)->icsk_accept_queue);
277}
278
279static inline int inet_csk_reqsk_queue_len(const struct sock *sk)
280{
281 return reqsk_queue_len(&inet_csk(sk)->icsk_accept_queue);
282}
283
284static inline int inet_csk_reqsk_queue_is_full(const struct sock *sk)
285{
286 return inet_csk_reqsk_queue_len(sk) >= sk->sk_max_ack_backlog;
287}
288
289bool inet_csk_reqsk_queue_drop(struct sock *sk, struct request_sock *req);
290void inet_csk_reqsk_queue_drop_and_put(struct sock *sk, struct request_sock *req);
291
292static inline unsigned long
293reqsk_timeout(struct request_sock *req, unsigned long max_timeout)
294{
295 u64 timeout = (u64)req->timeout << req->num_timeout;
296
297 return (unsigned long)min_t(u64, timeout, max_timeout);
298}
299
300static inline void inet_csk_prepare_for_destroy_sock(struct sock *sk)
301{
302 /* The below has to be done to allow calling inet_csk_destroy_sock */
303 sock_set_flag(sk, SOCK_DEAD);
304 this_cpu_inc(*sk->sk_prot->orphan_count);
305}
306
307void inet_csk_destroy_sock(struct sock *sk);
308void inet_csk_prepare_forced_close(struct sock *sk);
309
310/*
311 * LISTEN is a special case for poll..
312 */
313static inline __poll_t inet_csk_listen_poll(const struct sock *sk)
314{
315 return !reqsk_queue_empty(&inet_csk(sk)->icsk_accept_queue) ?
316 (EPOLLIN | EPOLLRDNORM) : 0;
317}
318
319int inet_csk_listen_start(struct sock *sk);
320void inet_csk_listen_stop(struct sock *sk);
321
322void inet_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr);
323
324/* update the fast reuse flag when adding a socket */
325void inet_csk_update_fastreuse(struct inet_bind_bucket *tb,
326 struct sock *sk);
327
328struct dst_entry *inet_csk_update_pmtu(struct sock *sk, u32 mtu);
329
330static inline void inet_csk_enter_pingpong_mode(struct sock *sk)
331{
332 inet_csk(sk)->icsk_ack.pingpong =
333 READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_pingpong_thresh);
334}
335
336static inline void inet_csk_exit_pingpong_mode(struct sock *sk)
337{
338 inet_csk(sk)->icsk_ack.pingpong = 0;
339}
340
341static inline bool inet_csk_in_pingpong_mode(struct sock *sk)
342{
343 return inet_csk(sk)->icsk_ack.pingpong >=
344 READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_pingpong_thresh);
345}
346
347static inline void inet_csk_inc_pingpong_cnt(struct sock *sk)
348{
349 struct inet_connection_sock *icsk = inet_csk(sk);
350
351 if (icsk->icsk_ack.pingpong < U8_MAX)
352 icsk->icsk_ack.pingpong++;
353}
354
355static inline bool inet_csk_has_ulp(const struct sock *sk)
356{
357 return inet_test_bit(IS_ICSK, sk) && !!inet_csk(sk)->icsk_ulp_ops;
358}
359
360static inline void inet_init_csk_locks(struct sock *sk)
361{
362 struct inet_connection_sock *icsk = inet_csk(sk);
363
364 spin_lock_init(&icsk->icsk_accept_queue.rskq_lock);
365 spin_lock_init(&icsk->icsk_accept_queue.fastopenq.lock);
366}
367
368#endif /* _INET_CONNECTION_SOCK_H */