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[DCCP]: Remove leftover dccp_send_response prototype
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / dccp / dccp.h
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ACM		 1#ifndef _DCCP_H
2#define _DCCP_H
3/*
4 * net/dccp/dccp.h
5 *
6 * An implementation of the DCCP protocol
1bc09869
IM		 7 * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
8 * Copyright (c) 2005 Ian McDonald <iam4@cs.waikato.ac.nz>
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ACM		 9 *
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 */
14
725ba8ee 15#include <linux/config.h>
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ACM		 16#include <linux/dccp.h>
17#include <net/snmp.h>
18#include <net/sock.h>
19#include <net/tcp.h>
ae31c339 20#include "ackvec.h"
7c657876 21
725ba8ee 22#ifdef CONFIG_IP_DCCP_DEBUG
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ACM		 23extern int dccp_debug;
24
25#define dccp_pr_debug(format, a...) \
26 do { if (dccp_debug) \
27 printk(KERN_DEBUG "%s: " format, __FUNCTION__ , ##a); \
28 } while (0)
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ACM		 29#define dccp_pr_debug_cat(format, a...) do { if (dccp_debug) \
30 printk(format, ##a); } while (0)
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ACM		 31#else
32#define dccp_pr_debug(format, a...)
33#define dccp_pr_debug_cat(format, a...)
34#endif
35
36extern struct inet_hashinfo dccp_hashinfo;
37
38extern atomic_t dccp_orphan_count;
39extern int dccp_tw_count;
40extern void dccp_tw_deschedule(struct inet_timewait_sock *tw);
41
42extern void dccp_time_wait(struct sock *sk, int state, int timeo);
43
44/* FIXME: Right size this */
45#define DCCP_MAX_OPT_LEN 128
46
47#define DCCP_MAX_PACKET_HDR 32
48
49#define MAX_DCCP_HEADER (DCCP_MAX_PACKET_HDR + DCCP_MAX_OPT_LEN + MAX_HEADER)
50
51#define DCCP_TIMEWAIT_LEN (60 * HZ) /* how long to wait to destroy TIME-WAIT
52 * state, about 60 seconds */
53
54/* draft-ietf-dccp-spec-11.txt initial RTO value */
55#define DCCP_TIMEOUT_INIT ((unsigned)(3 * HZ))
56
57/* Maximal interval between probes for local resources. */
58#define DCCP_RESOURCE_PROBE_INTERVAL ((unsigned)(HZ / 2U))
59
60#define DCCP_RTO_MAX ((unsigned)(120 * HZ)) /* FIXME: using TCP value */
61
7c657876 62/* is seq1 < seq2 ? */
a10cedd4 63static inline int before48(const u64 seq1, const u64 seq2)
7c657876 64{
a10cedd4 65 return (s64)((seq1 << 16) - (seq2 << 16)) < 0;
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ACM		 66}
67
68/* is seq1 > seq2 ? */
a10cedd4 69static inline int after48(const u64 seq1, const u64 seq2)
7c657876 70{
a10cedd4 71 return (s64)((seq2 << 16) - (seq1 << 16)) < 0;
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ACM		 72}
73
74/* is seq2 <= seq1 <= seq3 ? */
a10cedd4 75static inline int between48(const u64 seq1, const u64 seq2, const u64 seq3)
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ACM		 76{
77 return (seq3 << 16) - (seq2 << 16) >= (seq1 << 16) - (seq2 << 16);
78}
79
80static inline u64 max48(const u64 seq1, const u64 seq2)
81{
82 return after48(seq1, seq2) ? seq1 : seq2;
83}
84
85enum {
86 DCCP_MIB_NUM = 0,
87 DCCP_MIB_ACTIVEOPENS, /* ActiveOpens */
88 DCCP_MIB_ESTABRESETS, /* EstabResets */
89 DCCP_MIB_CURRESTAB, /* CurrEstab */
90 DCCP_MIB_OUTSEGS, /* OutSegs */
91 DCCP_MIB_OUTRSTS,
92 DCCP_MIB_ABORTONTIMEOUT,
93 DCCP_MIB_TIMEOUTS,
94 DCCP_MIB_ABORTFAILED,
95 DCCP_MIB_PASSIVEOPENS,
96 DCCP_MIB_ATTEMPTFAILS,
97 DCCP_MIB_OUTDATAGRAMS,
98 DCCP_MIB_INERRS,
99 DCCP_MIB_OPTMANDATORYERROR,
100 DCCP_MIB_INVALIDOPT,
101 __DCCP_MIB_MAX
102};
103
104#define DCCP_MIB_MAX __DCCP_MIB_MAX
105struct dccp_mib {
106 unsigned long mibs[DCCP_MIB_MAX];
107} __SNMP_MIB_ALIGN__;
108
109DECLARE_SNMP_STAT(struct dccp_mib, dccp_statistics);
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ACM		 110#define DCCP_INC_STATS(field) SNMP_INC_STATS(dccp_statistics, field)
111#define DCCP_INC_STATS_BH(field) SNMP_INC_STATS_BH(dccp_statistics, field)
112#define DCCP_INC_STATS_USER(field) SNMP_INC_STATS_USER(dccp_statistics, field)
113#define DCCP_DEC_STATS(field) SNMP_DEC_STATS(dccp_statistics, field)
114#define DCCP_ADD_STATS_BH(field, val) \
115 SNMP_ADD_STATS_BH(dccp_statistics, field, val)
116#define DCCP_ADD_STATS_USER(field, val) \
117 SNMP_ADD_STATS_USER(dccp_statistics, field, val)
7c657876 118
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ACM		 119extern int dccp_retransmit_skb(struct sock *sk, struct sk_buff *skb);
120
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ACM		 121extern void dccp_send_ack(struct sock *sk);
122extern void dccp_send_delayed_ack(struct sock *sk);
e92ae93a
ACM		 123extern void dccp_send_sync(struct sock *sk, const u64 seq,
124 const enum dccp_pkt_type pkt_type);
7c657876 125
d6809c12 126extern int dccp_write_xmit(struct sock *sk, struct sk_buff *skb, long *timeo);
c530cfb1 127extern void dccp_write_space(struct sock *sk);
27258ee5 128
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ACM		 129extern void dccp_init_xmit_timers(struct sock *sk);
130static inline void dccp_clear_xmit_timers(struct sock *sk)
131{
132 inet_csk_clear_xmit_timers(sk);
133}
134
135extern unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu);
136
137extern const char *dccp_packet_name(const int type);
138extern const char *dccp_state_name(const int state);
139
c25a18ba
ACM		 140extern void dccp_set_state(struct sock *sk, const int state);
141extern void dccp_done(struct sock *sk);
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ACM		 142
143static inline void dccp_openreq_init(struct request_sock *req,
144 struct dccp_sock *dp,
145 struct sk_buff *skb)
146{
147 /*
148 * FIXME: fill in the other req fields from the DCCP options
149 * received
150 */
151 inet_rsk(req)->rmt_port = dccp_hdr(skb)->dccph_sport;
152 inet_rsk(req)->acked = 0;
153 req->rcv_wnd = 0;
154}
155
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ACM		 156extern int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb);
157
158extern struct sock *dccp_create_openreq_child(struct sock *sk,
159 const struct request_sock *req,
160 const struct sk_buff *skb);
161
162extern int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb);
163
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ACM		 164extern struct sock *dccp_v4_request_recv_sock(struct sock *sk,
165 struct sk_buff *skb,
166 struct request_sock *req,
167 struct dst_entry *dst);
168extern struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb,
169 struct request_sock *req,
170 struct request_sock **prev);
171
172extern int dccp_child_process(struct sock *parent, struct sock *child,
173 struct sk_buff *skb);
174extern int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
175 struct dccp_hdr *dh, unsigned len);
176extern int dccp_rcv_established(struct sock *sk, struct sk_buff *skb,
177 const struct dccp_hdr *dh, const unsigned len);
178
72478873 179extern int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized);
3e0fadc5 180extern int dccp_destroy_sock(struct sock *sk);
f21e68ca 181
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ACM		 182extern void dccp_close(struct sock *sk, long timeout);
183extern struct sk_buff *dccp_make_response(struct sock *sk,
184 struct dst_entry *dst,
185 struct request_sock *req);
186
187extern int dccp_connect(struct sock *sk);
188extern int dccp_disconnect(struct sock *sk, int flags);
c985ed70 189extern void dccp_hash(struct sock *sk);
f21e68ca 190extern void dccp_unhash(struct sock *sk);
7c657876 191extern int dccp_getsockopt(struct sock *sk, int level, int optname,
a1d3a355
ACM		 192 char __user *optval, int __user *optlen);
193extern int dccp_setsockopt(struct sock *sk, int level, int optname,
194 char __user *optval, int optlen);
7c657876 195extern int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg);
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ACM		 196extern int dccp_sendmsg(struct kiocb *iocb, struct sock *sk,
197 struct msghdr *msg, size_t size);
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ACM		 198extern int dccp_recvmsg(struct kiocb *iocb, struct sock *sk,
199 struct msghdr *msg, size_t len, int nonblock,
200 int flags, int *addr_len);
7c657876 201extern void dccp_shutdown(struct sock *sk, int how);
f21e68ca
ACM		 202extern int inet_dccp_listen(struct socket *sock, int backlog);
203extern unsigned int dccp_poll(struct file *file, struct socket *sock,
204 poll_table *wait);
205extern void dccp_v4_send_check(struct sock *sk, int len,
206 struct sk_buff *skb);
207extern int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr,
208 int addr_len);
7c657876 209
95b81ef7 210extern int dccp_v4_checksum(const struct sk_buff *skb,
60fe62e7 211 const __be32 saddr, const __be32 daddr);
7c657876 212
017487d7 213extern int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code);
7ad07e7c 214extern void dccp_send_close(struct sock *sk, const int active);
f21e68ca
ACM		 215extern int dccp_invalid_packet(struct sk_buff *skb);
216
217static inline int dccp_bad_service_code(const struct sock *sk,
60fe62e7 218 const __be32 service)
f21e68ca
ACM		 219{
220 const struct dccp_sock *dp = dccp_sk(sk);
221
222 if (dp->dccps_service == service)
223 return 0;
224 return !dccp_list_has_service(dp->dccps_service_list, service);
225}
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ACM		 226
227struct dccp_skb_cb {
67e6b629
ACM		 228 __u8 dccpd_type:4;
229 __u8 dccpd_ccval:4;
230 __u8 dccpd_reset_code;
231 __u16 dccpd_opt_len;
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ACM		 232 __u64 dccpd_seq;
233 __u64 dccpd_ack_seq;
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ACM		 234};
235
236#define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0]))
237
238static inline int dccp_non_data_packet(const struct sk_buff *skb)
239{
240 const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
241
242 return type == DCCP_PKT_ACK ||
243 type == DCCP_PKT_CLOSE ||
244 type == DCCP_PKT_CLOSEREQ ||
245 type == DCCP_PKT_RESET ||
246 type == DCCP_PKT_SYNC ||
247 type == DCCP_PKT_SYNCACK;
248}
249
250static inline int dccp_packet_without_ack(const struct sk_buff *skb)
251{
252 const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
253
254 return type == DCCP_PKT_DATA || type == DCCP_PKT_REQUEST;
255}
256
257#define DCCP_MAX_SEQNO ((((u64)1) << 48) - 1)
258#define DCCP_PKT_WITHOUT_ACK_SEQ (DCCP_MAX_SEQNO << 2)
259
260static inline void dccp_set_seqno(u64 *seqno, u64 value)
261{
262 if (value > DCCP_MAX_SEQNO)
263 value -= DCCP_MAX_SEQNO + 1;
264 *seqno = value;
265}
266
267static inline u64 dccp_delta_seqno(u64 seqno1, u64 seqno2)
268{
269 return ((seqno2 << 16) - (seqno1 << 16)) >> 16;
270}
271
272static inline void dccp_inc_seqno(u64 *seqno)
273{
274 if (++*seqno > DCCP_MAX_SEQNO)
275 *seqno = 0;
276}
277
278static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss)
279{
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ACM		 280 struct dccp_hdr_ext *dhx = (struct dccp_hdr_ext *)((void *)dh +
281 sizeof(*dh));
60fe62e7
AB		 282 dh->dccph_seq2 = 0;
283 dh->dccph_seq = htons((gss >> 32) & 0xfffff);
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ACM		 284 dhx->dccph_seq_low = htonl(gss & 0xffffffff);
285}
286
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ACM		 287static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack,
288 const u64 gsr)
7c657876 289{
60fe62e7
AB		 290 dhack->dccph_reserved1 = 0;
291 dhack->dccph_ack_nr_high = htons(gsr >> 32);
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ACM		 292 dhack->dccph_ack_nr_low = htonl(gsr & 0xffffffff);
293}
294
295static inline void dccp_update_gsr(struct sock *sk, u64 seq)
296{
297 struct dccp_sock *dp = dccp_sk(sk);
7c657876 298
03ace394
ACM		 299 dp->dccps_gsr = seq;
300 dccp_set_seqno(&dp->dccps_swl,
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ACM		 301 (dp->dccps_gsr + 1 -
302 (dp->dccps_options.dccpo_sequence_window / 4)));
7c657876 303 dccp_set_seqno(&dp->dccps_swh,
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ACM		 304 (dp->dccps_gsr +
305 (3 * dp->dccps_options.dccpo_sequence_window) / 4));
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ACM		 306}
307
308static inline void dccp_update_gss(struct sock *sk, u64 seq)
309{
310 struct dccp_sock *dp = dccp_sk(sk);
7c657876 311
03ace394
ACM		 312 dp->dccps_awh = dp->dccps_gss = seq;
313 dccp_set_seqno(&dp->dccps_awl,
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ACM		 314 (dp->dccps_gss -
315 dp->dccps_options.dccpo_sequence_window + 1));
7c657876 316}
ae31c339
ACM		 317
318static inline int dccp_ack_pending(const struct sock *sk)
319{
320 const struct dccp_sock *dp = dccp_sk(sk);
321 return dp->dccps_timestamp_echo != 0 ||
322#ifdef CONFIG_IP_DCCP_ACKVEC
323 (dp->dccps_options.dccpo_send_ack_vector &&
324 dccp_ackvec_pending(dp->dccps_hc_rx_ackvec)) ||
325#endif
326 inet_csk_ack_scheduled(sk);
327}
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ACM		 328
329extern void dccp_insert_options(struct sock *sk, struct sk_buff *skb);
330extern void dccp_insert_option_elapsed_time(struct sock *sk,
331 struct sk_buff *skb,
332 u32 elapsed_time);
d4b81ff7
ACM		 333extern void dccp_insert_option_timestamp(struct sock *sk,
334 struct sk_buff *skb);
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ACM		 335extern void dccp_insert_option(struct sock *sk, struct sk_buff *skb,
336 unsigned char option,
337 const void *value, unsigned char len);
338
b0e56780
ACM		 339extern void dccp_timestamp(const struct sock *sk, struct timeval *tv);
340
b6ee3d4a
ACM		 341static inline suseconds_t timeval_usecs(const struct timeval *tv)
342{
343 return tv->tv_sec * USEC_PER_SEC + tv->tv_usec;
344}
345
346static inline suseconds_t timeval_delta(const struct timeval *large,
347 const struct timeval *small)
348{
349 time_t secs = large->tv_sec - small->tv_sec;
350 suseconds_t usecs = large->tv_usec - small->tv_usec;
351
352 if (usecs < 0) {
353 secs--;
354 usecs += USEC_PER_SEC;
355 }
356 return secs * USEC_PER_SEC + usecs;
357}
358
359static inline void timeval_add_usecs(struct timeval *tv,
360 const suseconds_t usecs)
361{
362 tv->tv_usec += usecs;
363 while (tv->tv_usec >= USEC_PER_SEC) {
364 tv->tv_sec++;
365 tv->tv_usec -= USEC_PER_SEC;
366 }
367}
368
369static inline void timeval_sub_usecs(struct timeval *tv,
370 const suseconds_t usecs)
371{
372 tv->tv_usec -= usecs;
373 while (tv->tv_usec < 0) {
374 tv->tv_sec--;
375 tv->tv_usec += USEC_PER_SEC;
376 }
377}
378
e55d912f
ACM		 379#ifdef CONFIG_SYSCTL
380extern int dccp_sysctl_init(void);
381extern void dccp_sysctl_exit(void);
382#else
383static inline int dccp_sysctl_init(void)
384{
385 return 0;
386}
387
388static inline void dccp_sysctl_exit(void)
389{
390}
391#endif
392
7c657876 393#endif /* _DCCP_H */
kernel source for telekom puls (alcatel/mediatek)