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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
29#undef INET_CSK_CLEAR_TIMERS
30
31struct inet_bind_bucket;
32struct tcp_congestion_ops;
33
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38struct inet_connection_sock_af_ops {
39 int (*queue_xmit)(struct sk_buff *skb);
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};
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86struct inet_connection_sock {
87
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;
108 __u8 quick;
109 __u8 pingpong;
110 __u8 blocked;
111 __u32 ato;
112 unsigned long timeout;
113 __u32 lrcvtime;
114 __u16 last_seg_size;
115 __u16 rcv_mss;
116 } icsk_ack;
117 struct {
118 int enabled;
119
120
121 int search_high;
122 int search_low;
123
124
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
133#define ICSK_TIME_DACK 2
134#define ICSK_TIME_PROBE0 3
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
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 const struct request_sock *req);
253
254static inline void inet_csk_reqsk_queue_add(struct sock *sk,
255 struct request_sock *req,
256 struct sock *child)
257{
258 reqsk_queue_add(&inet_csk(sk)->icsk_accept_queue, req, sk, child);
259}
260
261extern void inet_csk_reqsk_queue_hash_add(struct sock *sk,
262 struct request_sock *req,
263 unsigned long timeout);
264
265static inline void inet_csk_reqsk_queue_removed(struct sock *sk,
266 struct request_sock *req)
267{
268 if (reqsk_queue_removed(&inet_csk(sk)->icsk_accept_queue, req) == 0)
269 inet_csk_delete_keepalive_timer(sk);
270}
271
272static inline void inet_csk_reqsk_queue_added(struct sock *sk,
273 const unsigned long timeout)
274{
275 if (reqsk_queue_added(&inet_csk(sk)->icsk_accept_queue) == 0)
276 inet_csk_reset_keepalive_timer(sk, timeout);
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_young(const struct sock *sk)
285{
286 return reqsk_queue_len_young(&inet_csk(sk)->icsk_accept_queue);
287}
288
289static inline int inet_csk_reqsk_queue_is_full(const struct sock *sk)
290{
291 return reqsk_queue_is_full(&inet_csk(sk)->icsk_accept_queue);
292}
293
294static inline void inet_csk_reqsk_queue_unlink(struct sock *sk,
295 struct request_sock *req,
296 struct request_sock **prev)
297{
298 reqsk_queue_unlink(&inet_csk(sk)->icsk_accept_queue, req, prev);
299}
300
301static inline void inet_csk_reqsk_queue_drop(struct sock *sk,
302 struct request_sock *req,
303 struct request_sock **prev)
304{
305 inet_csk_reqsk_queue_unlink(sk, req, prev);
306 inet_csk_reqsk_queue_removed(sk, req);
307 reqsk_free(req);
308}
309
310extern void inet_csk_reqsk_queue_prune(struct sock *parent,
311 const unsigned long interval,
312 const unsigned long timeout,
313 const unsigned long max_rto);
314
315extern void inet_csk_destroy_sock(struct sock *sk);
316
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318
319
320static inline unsigned int inet_csk_listen_poll(const struct sock *sk)
321{
322 return !reqsk_queue_empty(&inet_csk(sk)->icsk_accept_queue) ?
323 (POLLIN | POLLRDNORM) : 0;
324}
325
326extern int inet_csk_listen_start(struct sock *sk, const int nr_table_entries);
327extern void inet_csk_listen_stop(struct sock *sk);
328
329extern void inet_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr);
330
331extern int inet_csk_compat_getsockopt(struct sock *sk, int level, int optname,
332 char __user *optval, int __user *optlen);
333extern int inet_csk_compat_setsockopt(struct sock *sk, int level, int optname,
334 char __user *optval, unsigned int optlen);
335#endif
336