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463c84b9 ACM |
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 | ||
8292a17a | 18 | #include <linux/compiler.h> |
3f421baa | 19 | #include <linux/string.h> |
463c84b9 | 20 | #include <linux/timer.h> |
bd01f843 | 21 | #include <linux/poll.h> |
14c85021 ACM |
22 | |
23 | #include <net/inet_sock.h> | |
463c84b9 ACM |
24 | #include <net/request_sock.h> |
25 | ||
3f421baa ACM |
26 | #define INET_CSK_DEBUG 1 |
27 | ||
28 | /* Cancel timers, when they are not required. */ | |
29 | #undef INET_CSK_CLEAR_TIMERS | |
30 | ||
463c84b9 | 31 | struct inet_bind_bucket; |
6687e988 | 32 | struct tcp_congestion_ops; |
463c84b9 | 33 | |
8292a17a ACM |
34 | /* |
35 | * Pointers to address related TCP functions | |
36 | * (i.e. things that depend on the address family) | |
37 | */ | |
38 | struct inet_connection_sock_af_ops { | |
b0270e91 | 39 | int (*queue_xmit)(struct sock *sk, struct sk_buff *skb, struct flowi *fl); |
bb296246 | 40 | void (*send_check)(struct sock *sk, struct sk_buff *skb); |
8292a17a | 41 | int (*rebuild_header)(struct sock *sk); |
5d299f3d | 42 | void (*sk_rx_dst_set)(struct sock *sk, const struct sk_buff *skb); |
8292a17a ACM |
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); | |
850db6b8 | 47 | u16 net_header_len; |
67469601 | 48 | u16 net_frag_header_len; |
850db6b8 | 49 | u16 sockaddr_len; |
8292a17a | 50 | int (*setsockopt)(struct sock *sk, int level, int optname, |
b7058842 | 51 | char __user *optval, unsigned int optlen); |
8292a17a ACM |
52 | int (*getsockopt)(struct sock *sk, int level, int optname, |
53 | char __user *optval, int __user *optlen); | |
af01d537 | 54 | #ifdef CONFIG_COMPAT |
3fdadf7d DM |
55 | int (*compat_setsockopt)(struct sock *sk, |
56 | int level, int optname, | |
b7058842 | 57 | char __user *optval, unsigned int optlen); |
3fdadf7d DM |
58 | int (*compat_getsockopt)(struct sock *sk, |
59 | int level, int optname, | |
60 | char __user *optval, int __user *optlen); | |
af01d537 | 61 | #endif |
8292a17a | 62 | void (*addr2sockaddr)(struct sock *sk, struct sockaddr *); |
ab1e0a13 | 63 | int (*bind_conflict)(const struct sock *sk, |
aacd9289 | 64 | const struct inet_bind_bucket *tb, bool relax); |
4fab9071 | 65 | void (*mtu_reduced)(struct sock *sk); |
8292a17a ACM |
66 | }; |
67 | ||
463c84b9 ACM |
68 | /** inet_connection_sock - INET connection oriented sock |
69 | * | |
70 | * @icsk_accept_queue: FIFO of established children | |
71 | * @icsk_bind_hash: Bind node | |
72 | * @icsk_timeout: Timeout | |
73 | * @icsk_retransmit_timer: Resend (no ack) | |
74 | * @icsk_rto: Retransmit timeout | |
d83d8461 | 75 | * @icsk_pmtu_cookie Last pmtu seen by socket |
6687e988 | 76 | * @icsk_ca_ops Pluggable congestion control hook |
8292a17a | 77 | * @icsk_af_ops Operations which are AF_INET{4,6} specific |
6687e988 | 78 | * @icsk_ca_state: Congestion control state |
463c84b9 ACM |
79 | * @icsk_retransmits: Number of unrecovered [RTO] timeouts |
80 | * @icsk_pending: Scheduled timer event | |
81 | * @icsk_backoff: Backoff | |
82 | * @icsk_syn_retries: Number of allowed SYN (or equivalent) retries | |
6687e988 | 83 | * @icsk_probes_out: unanswered 0 window probes |
d83d8461 | 84 | * @icsk_ext_hdr_len: Network protocol overhead (IP/IPv6 options) |
463c84b9 | 85 | * @icsk_ack: Delayed ACK control data |
5d424d5a | 86 | * @icsk_mtup; MTU probing control data |
463c84b9 ACM |
87 | */ |
88 | struct inet_connection_sock { | |
89 | /* inet_sock has to be the first member! */ | |
90 | struct inet_sock icsk_inet; | |
91 | struct request_sock_queue icsk_accept_queue; | |
92 | struct inet_bind_bucket *icsk_bind_hash; | |
93 | unsigned long icsk_timeout; | |
94 | struct timer_list icsk_retransmit_timer; | |
95 | struct timer_list icsk_delack_timer; | |
96 | __u32 icsk_rto; | |
d83d8461 | 97 | __u32 icsk_pmtu_cookie; |
770cfbcf SH |
98 | const struct tcp_congestion_ops *icsk_ca_ops; |
99 | const struct inet_connection_sock_af_ops *icsk_af_ops; | |
d83d8461 | 100 | unsigned int (*icsk_sync_mss)(struct sock *sk, u32 pmtu); |
c5c6a8ab DB |
101 | __u8 icsk_ca_state:7, |
102 | icsk_ca_dst_locked:1; | |
463c84b9 ACM |
103 | __u8 icsk_retransmits; |
104 | __u8 icsk_pending; | |
105 | __u8 icsk_backoff; | |
106 | __u8 icsk_syn_retries; | |
6687e988 | 107 | __u8 icsk_probes_out; |
d83d8461 | 108 | __u16 icsk_ext_hdr_len; |
463c84b9 ACM |
109 | struct { |
110 | __u8 pending; /* ACK is pending */ | |
111 | __u8 quick; /* Scheduled number of quick acks */ | |
112 | __u8 pingpong; /* The session is interactive */ | |
113 | __u8 blocked; /* Delayed ACK was blocked by socket lock */ | |
114 | __u32 ato; /* Predicted tick of soft clock */ | |
115 | unsigned long timeout; /* Currently scheduled timeout */ | |
116 | __u32 lrcvtime; /* timestamp of last received data packet */ | |
117 | __u16 last_seg_size; /* Size of last incoming segment */ | |
118 | __u16 rcv_mss; /* MSS used for delayed ACK decisions */ | |
119 | } icsk_ack; | |
5d424d5a JH |
120 | struct { |
121 | int enabled; | |
122 | ||
123 | /* Range of MTUs to search */ | |
124 | int search_high; | |
125 | int search_low; | |
126 | ||
127 | /* Information on the current probe. */ | |
128 | int probe_size; | |
05cbc0db FD |
129 | |
130 | u32 probe_timestamp; | |
5d424d5a | 131 | } icsk_mtup; |
6687e988 | 132 | u32 icsk_ca_priv[16]; |
dca43c75 | 133 | u32 icsk_user_timeout; |
6687e988 | 134 | #define ICSK_CA_PRIV_SIZE (16 * sizeof(u32)) |
463c84b9 ACM |
135 | }; |
136 | ||
3f421baa ACM |
137 | #define ICSK_TIME_RETRANS 1 /* Retransmit timer */ |
138 | #define ICSK_TIME_DACK 2 /* Delayed ack timer */ | |
139 | #define ICSK_TIME_PROBE0 3 /* Zero window probe timer */ | |
6ba8a3b1 ND |
140 | #define ICSK_TIME_EARLY_RETRANS 4 /* Early retransmit timer */ |
141 | #define ICSK_TIME_LOSS_PROBE 5 /* Tail loss probe timer */ | |
3f421baa | 142 | |
463c84b9 ACM |
143 | static inline struct inet_connection_sock *inet_csk(const struct sock *sk) |
144 | { | |
145 | return (struct inet_connection_sock *)sk; | |
146 | } | |
147 | ||
6687e988 ACM |
148 | static inline void *inet_csk_ca(const struct sock *sk) |
149 | { | |
150 | return (void *)inet_csk(sk)->icsk_ca_priv; | |
151 | } | |
152 | ||
1fd51155 JP |
153 | struct sock *inet_csk_clone_lock(const struct sock *sk, |
154 | const struct request_sock *req, | |
155 | const gfp_t priority); | |
9f1d2604 | 156 | |
3f421baa ACM |
157 | enum inet_csk_ack_state_t { |
158 | ICSK_ACK_SCHED = 1, | |
159 | ICSK_ACK_TIMER = 2, | |
1ef9696c AK |
160 | ICSK_ACK_PUSHED = 4, |
161 | ICSK_ACK_PUSHED2 = 8 | |
3f421baa ACM |
162 | }; |
163 | ||
1fd51155 JP |
164 | void inet_csk_init_xmit_timers(struct sock *sk, |
165 | void (*retransmit_handler)(unsigned long), | |
166 | void (*delack_handler)(unsigned long), | |
167 | void (*keepalive_handler)(unsigned long)); | |
168 | void inet_csk_clear_xmit_timers(struct sock *sk); | |
463c84b9 | 169 | |
3f421baa ACM |
170 | static inline void inet_csk_schedule_ack(struct sock *sk) |
171 | { | |
172 | inet_csk(sk)->icsk_ack.pending |= ICSK_ACK_SCHED; | |
173 | } | |
174 | ||
175 | static inline int inet_csk_ack_scheduled(const struct sock *sk) | |
176 | { | |
177 | return inet_csk(sk)->icsk_ack.pending & ICSK_ACK_SCHED; | |
178 | } | |
179 | ||
180 | static 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 | ||
1fd51155 JP |
185 | void inet_csk_delete_keepalive_timer(struct sock *sk); |
186 | void inet_csk_reset_keepalive_timer(struct sock *sk, unsigned long timeout); | |
3f421baa ACM |
187 | |
188 | #ifdef INET_CSK_DEBUG | |
189 | extern const char inet_csk_timer_bug_msg[]; | |
190 | #endif | |
191 | ||
192 | static inline void inet_csk_clear_xmit_timer(struct sock *sk, const int what) | |
193 | { | |
194 | struct inet_connection_sock *icsk = inet_csk(sk); | |
195 | ||
196 | if (what == ICSK_TIME_RETRANS || what == ICSK_TIME_PROBE0) { | |
197 | icsk->icsk_pending = 0; | |
198 | #ifdef INET_CSK_CLEAR_TIMERS | |
199 | sk_stop_timer(sk, &icsk->icsk_retransmit_timer); | |
200 | #endif | |
201 | } else if (what == ICSK_TIME_DACK) { | |
202 | icsk->icsk_ack.blocked = icsk->icsk_ack.pending = 0; | |
203 | #ifdef INET_CSK_CLEAR_TIMERS | |
204 | sk_stop_timer(sk, &icsk->icsk_delack_timer); | |
205 | #endif | |
206 | } | |
207 | #ifdef INET_CSK_DEBUG | |
208 | else { | |
d8971fcb | 209 | pr_debug("%s", inet_csk_timer_bug_msg); |
3f421baa ACM |
210 | } |
211 | #endif | |
212 | } | |
213 | ||
214 | /* | |
215 | * Reset the retransmission timer | |
216 | */ | |
217 | static 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 | #ifdef INET_CSK_DEBUG | |
225 | pr_debug("reset_xmit_timer: sk=%p %d when=0x%lx, caller=%p\n", | |
226 | sk, what, when, current_text_addr()); | |
227 | #endif | |
228 | when = max_when; | |
229 | } | |
230 | ||
6ba8a3b1 ND |
231 | if (what == ICSK_TIME_RETRANS || what == ICSK_TIME_PROBE0 || |
232 | what == ICSK_TIME_EARLY_RETRANS || what == ICSK_TIME_LOSS_PROBE) { | |
3f421baa ACM |
233 | icsk->icsk_pending = what; |
234 | icsk->icsk_timeout = jiffies + when; | |
235 | sk_reset_timer(sk, &icsk->icsk_retransmit_timer, icsk->icsk_timeout); | |
236 | } else if (what == ICSK_TIME_DACK) { | |
237 | icsk->icsk_ack.pending |= ICSK_ACK_TIMER; | |
238 | icsk->icsk_ack.timeout = jiffies + when; | |
239 | sk_reset_timer(sk, &icsk->icsk_delack_timer, icsk->icsk_ack.timeout); | |
240 | } | |
241 | #ifdef INET_CSK_DEBUG | |
242 | else { | |
d8971fcb | 243 | pr_debug("%s", inet_csk_timer_bug_msg); |
3f421baa ACM |
244 | } |
245 | #endif | |
246 | } | |
247 | ||
fcdd1cf4 ED |
248 | static inline unsigned long |
249 | inet_csk_rto_backoff(const struct inet_connection_sock *icsk, | |
250 | unsigned long max_when) | |
251 | { | |
252 | u64 when = (u64)icsk->icsk_rto << icsk->icsk_backoff; | |
253 | ||
254 | return (unsigned long)min_t(u64, when, max_when); | |
255 | } | |
256 | ||
1fd51155 | 257 | struct sock *inet_csk_accept(struct sock *sk, int flags, int *err); |
3f421baa | 258 | |
fa76ce73 | 259 | struct request_sock *inet_csk_search_req(struct sock *sk, |
1fd51155 JP |
260 | const __be16 rport, |
261 | const __be32 raddr, | |
262 | const __be32 laddr); | |
263 | int inet_csk_bind_conflict(const struct sock *sk, | |
264 | const struct inet_bind_bucket *tb, bool relax); | |
265 | int inet_csk_get_port(struct sock *sk, unsigned short snum); | |
463c84b9 | 266 | |
1fd51155 JP |
267 | struct dst_entry *inet_csk_route_req(struct sock *sk, struct flowi4 *fl4, |
268 | const struct request_sock *req); | |
269 | struct dst_entry *inet_csk_route_child_sock(struct sock *sk, struct sock *newsk, | |
ba3f7f04 | 270 | const struct request_sock *req); |
463c84b9 | 271 | |
3f421baa ACM |
272 | static inline void inet_csk_reqsk_queue_add(struct sock *sk, |
273 | struct request_sock *req, | |
274 | struct sock *child) | |
275 | { | |
276 | reqsk_queue_add(&inet_csk(sk)->icsk_accept_queue, req, sk, child); | |
277 | } | |
278 | ||
1fd51155 JP |
279 | void inet_csk_reqsk_queue_hash_add(struct sock *sk, struct request_sock *req, |
280 | unsigned long timeout); | |
3f421baa | 281 | |
3f421baa ACM |
282 | static inline void inet_csk_reqsk_queue_added(struct sock *sk, |
283 | const unsigned long timeout) | |
284 | { | |
fa76ce73 | 285 | reqsk_queue_added(&inet_csk(sk)->icsk_accept_queue); |
3f421baa ACM |
286 | } |
287 | ||
288 | static inline int inet_csk_reqsk_queue_len(const struct sock *sk) | |
289 | { | |
290 | return reqsk_queue_len(&inet_csk(sk)->icsk_accept_queue); | |
291 | } | |
292 | ||
293 | static inline int inet_csk_reqsk_queue_young(const struct sock *sk) | |
294 | { | |
295 | return reqsk_queue_len_young(&inet_csk(sk)->icsk_accept_queue); | |
296 | } | |
297 | ||
298 | static inline int inet_csk_reqsk_queue_is_full(const struct sock *sk) | |
299 | { | |
300 | return reqsk_queue_is_full(&inet_csk(sk)->icsk_accept_queue); | |
301 | } | |
302 | ||
b357a364 | 303 | void inet_csk_reqsk_queue_drop(struct sock *sk, struct request_sock *req); |
3f421baa | 304 | |
1fd51155 JP |
305 | void inet_csk_destroy_sock(struct sock *sk); |
306 | void inet_csk_prepare_forced_close(struct sock *sk); | |
dc40c7bc ACM |
307 | |
308 | /* | |
309 | * LISTEN is a special case for poll.. | |
310 | */ | |
311 | static inline unsigned int inet_csk_listen_poll(const struct sock *sk) | |
312 | { | |
313 | return !reqsk_queue_empty(&inet_csk(sk)->icsk_accept_queue) ? | |
314 | (POLLIN | POLLRDNORM) : 0; | |
315 | } | |
316 | ||
1fd51155 JP |
317 | int inet_csk_listen_start(struct sock *sk, const int nr_table_entries); |
318 | void inet_csk_listen_stop(struct sock *sk); | |
295f7324 | 319 | |
1fd51155 | 320 | void inet_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr); |
af05dc93 | 321 | |
1fd51155 JP |
322 | int inet_csk_compat_getsockopt(struct sock *sk, int level, int optname, |
323 | char __user *optval, int __user *optlen); | |
324 | int inet_csk_compat_setsockopt(struct sock *sk, int level, int optname, | |
325 | char __user *optval, unsigned int optlen); | |
80d0a69f | 326 | |
1fd51155 | 327 | struct dst_entry *inet_csk_update_pmtu(struct sock *sk, u32 mtu); |
463c84b9 | 328 | #endif /* _INET_CONNECTION_SOCK_H */ |