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Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001#ifndef _DCCP_H
2#define _DCCP_H
3/*
4 * net/dccp/dccp.h
5 *
6 * An implementation of the DCCP protocol
Ian McDonald1bc09862005-08-20 00:23:43 -03007 * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
Ian McDonalde6bccd32006-08-26 19:01:30 -07008 * Copyright (c) 2005-6 Ian McDonald <ian.mcdonald@jandi.co.nz>
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07009 *
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
15#include <linux/dccp.h>
16#include <net/snmp.h>
17#include <net/sock.h>
18#include <net/tcp.h>
Arnaldo Carvalho de Meloae31c332005-09-18 00:17:51 -070019#include "ackvec.h"
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070020
Arnaldo Carvalho de Melo725ba8e2005-08-13 20:35:39 -030021#ifdef CONFIG_IP_DCCP_DEBUG
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070022extern int dccp_debug;
23
24#define dccp_pr_debug(format, a...) \
25 do { if (dccp_debug) \
26 printk(KERN_DEBUG "%s: " format, __FUNCTION__ , ##a); \
27 } while (0)
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -030028#define dccp_pr_debug_cat(format, a...) do { if (dccp_debug) \
29 printk(format, ##a); } while (0)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070030#else
31#define dccp_pr_debug(format, a...)
32#define dccp_pr_debug_cat(format, a...)
33#endif
34
35extern struct inet_hashinfo dccp_hashinfo;
36
37extern atomic_t dccp_orphan_count;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070038
39extern void dccp_time_wait(struct sock *sk, int state, int timeo);
40
Gerrit Renker60361be2006-11-10 02:13:56 -020041/*
42 * Set safe upper bounds for header and option length. Since Data Offset is 8
43 * bits (RFC 4340, sec. 5.1), the total header length can never be more than
44 * 4 * 255 = 1020 bytes. The largest possible header length is 28 bytes (X=1):
45 * - DCCP-Response with ACK Subheader and 4 bytes of Service code OR
46 * - DCCP-Reset with ACK Subheader and 4 bytes of Reset Code fields
47 * Hence a safe upper bound for the maximum option length is 1020-28 = 992
48 */
49#define MAX_DCCP_SPECIFIC_HEADER (255 * sizeof(int))
50#define DCCP_MAX_PACKET_HDR 28
51#define DCCP_MAX_OPT_LEN (MAX_DCCP_SPECIFIC_HEADER - DCCP_MAX_PACKET_HDR)
52#define MAX_DCCP_HEADER (MAX_DCCP_SPECIFIC_HEADER + MAX_HEADER)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070053
54#define DCCP_TIMEWAIT_LEN (60 * HZ) /* how long to wait to destroy TIME-WAIT
55 * state, about 60 seconds */
56
Gerrit Renker0e64e942006-10-24 16:17:51 -070057/* RFC 1122, 4.2.3.1 initial RTO value */
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070058#define DCCP_TIMEOUT_INIT ((unsigned)(3 * HZ))
59
60/* Maximal interval between probes for local resources. */
61#define DCCP_RESOURCE_PROBE_INTERVAL ((unsigned)(HZ / 2U))
62
63#define DCCP_RTO_MAX ((unsigned)(120 * HZ)) /* FIXME: using TCP value */
64
Ian McDonaldf45b3ec2006-11-10 13:09:10 -020065#define DCCP_XMIT_TIMEO 30000 /* Time/msecs for blocking transmit per packet */
66
Gerrit Renker2e2e9e92006-11-13 13:23:52 -020067/* sysctl variables for DCCP */
68extern int sysctl_dccp_request_retries;
69extern int sysctl_dccp_retries1;
70extern int sysctl_dccp_retries2;
Gerrit Renkerafb0a342006-11-13 13:25:41 -020071extern int sysctl_dccp_feat_sequence_window;
72extern int sysctl_dccp_feat_rx_ccid;
73extern int sysctl_dccp_feat_tx_ccid;
74extern int sysctl_dccp_feat_ack_ratio;
75extern int sysctl_dccp_feat_send_ack_vector;
76extern int sysctl_dccp_feat_send_ndp_count;
Gerrit Renker2e2e9e92006-11-13 13:23:52 -020077
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070078/* is seq1 < seq2 ? */
Patrick McHardya10cedd2005-08-14 21:05:53 -030079static inline int before48(const u64 seq1, const u64 seq2)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070080{
Patrick McHardya10cedd2005-08-14 21:05:53 -030081 return (s64)((seq1 << 16) - (seq2 << 16)) < 0;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070082}
83
84/* is seq1 > seq2 ? */
Patrick McHardya10cedd2005-08-14 21:05:53 -030085static inline int after48(const u64 seq1, const u64 seq2)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070086{
Patrick McHardya10cedd2005-08-14 21:05:53 -030087 return (s64)((seq2 << 16) - (seq1 << 16)) < 0;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070088}
89
90/* is seq2 <= seq1 <= seq3 ? */
Patrick McHardya10cedd2005-08-14 21:05:53 -030091static inline int between48(const u64 seq1, const u64 seq2, const u64 seq3)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070092{
93 return (seq3 << 16) - (seq2 << 16) >= (seq1 << 16) - (seq2 << 16);
94}
95
96static inline u64 max48(const u64 seq1, const u64 seq2)
97{
98 return after48(seq1, seq2) ? seq1 : seq2;
99}
100
Ian McDonald837d1072006-08-26 19:06:42 -0700101/* is seq1 next seqno after seq2 */
102static inline int follows48(const u64 seq1, const u64 seq2)
103{
104 int diff = (seq1 & 0xFFFF) - (seq2 & 0xFFFF);
105
106 return diff==1;
107}
108
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700109enum {
110 DCCP_MIB_NUM = 0,
111 DCCP_MIB_ACTIVEOPENS, /* ActiveOpens */
112 DCCP_MIB_ESTABRESETS, /* EstabResets */
113 DCCP_MIB_CURRESTAB, /* CurrEstab */
114 DCCP_MIB_OUTSEGS, /* OutSegs */
115 DCCP_MIB_OUTRSTS,
116 DCCP_MIB_ABORTONTIMEOUT,
117 DCCP_MIB_TIMEOUTS,
118 DCCP_MIB_ABORTFAILED,
119 DCCP_MIB_PASSIVEOPENS,
120 DCCP_MIB_ATTEMPTFAILS,
121 DCCP_MIB_OUTDATAGRAMS,
122 DCCP_MIB_INERRS,
123 DCCP_MIB_OPTMANDATORYERROR,
124 DCCP_MIB_INVALIDOPT,
125 __DCCP_MIB_MAX
126};
127
128#define DCCP_MIB_MAX __DCCP_MIB_MAX
129struct dccp_mib {
130 unsigned long mibs[DCCP_MIB_MAX];
131} __SNMP_MIB_ALIGN__;
132
133DECLARE_SNMP_STAT(struct dccp_mib, dccp_statistics);
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -0300134#define DCCP_INC_STATS(field) SNMP_INC_STATS(dccp_statistics, field)
135#define DCCP_INC_STATS_BH(field) SNMP_INC_STATS_BH(dccp_statistics, field)
136#define DCCP_INC_STATS_USER(field) SNMP_INC_STATS_USER(dccp_statistics, field)
137#define DCCP_DEC_STATS(field) SNMP_DEC_STATS(dccp_statistics, field)
138#define DCCP_ADD_STATS_BH(field, val) \
139 SNMP_ADD_STATS_BH(dccp_statistics, field, val)
140#define DCCP_ADD_STATS_USER(field, val) \
141 SNMP_ADD_STATS_USER(dccp_statistics, field, val)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700142
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200143/*
144 * Checksumming routines
145 */
146static inline int dccp_csum_coverage(const struct sk_buff *skb)
147{
148 const struct dccp_hdr* dh = dccp_hdr(skb);
149
150 if (dh->dccph_cscov == 0)
151 return skb->len;
152 return (dh->dccph_doff + dh->dccph_cscov - 1) * sizeof(u32);
153}
154
155static inline void dccp_csum_outgoing(struct sk_buff *skb)
156{
157 int cov = dccp_csum_coverage(skb);
158
159 if (cov >= skb->len)
160 dccp_hdr(skb)->dccph_cscov = 0;
161
162 skb->csum = skb_checksum(skb, 0, (cov > skb->len)? skb->len : cov, 0);
163}
164
165extern void dccp_v4_send_check(struct sock *sk, int len, struct sk_buff *skb);
166
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700167extern int dccp_retransmit_skb(struct sock *sk, struct sk_buff *skb);
168
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700169extern void dccp_send_ack(struct sock *sk);
170extern void dccp_send_delayed_ack(struct sock *sk);
Gerrit Renker8a73cd02006-11-10 12:32:01 -0200171extern void dccp_reqsk_send_ack(struct sk_buff *sk, struct request_sock *rsk);
172
Arnaldo Carvalho de Meloe92ae932005-08-17 03:10:59 -0300173extern void dccp_send_sync(struct sock *sk, const u64 seq,
174 const enum dccp_pkt_type pkt_type);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700175
Ian McDonald97e58482006-08-26 19:16:45 -0700176extern void dccp_write_xmit(struct sock *sk, int block);
Arnaldo Carvalho de Meloc530cfb2005-08-29 02:15:54 -0300177extern void dccp_write_space(struct sock *sk);
Arnaldo Carvalho de Melo27258ee2005-08-09 20:30:56 -0700178
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700179extern void dccp_init_xmit_timers(struct sock *sk);
180static inline void dccp_clear_xmit_timers(struct sock *sk)
181{
182 inet_csk_clear_xmit_timers(sk);
183}
184
185extern unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu);
186
187extern const char *dccp_packet_name(const int type);
188extern const char *dccp_state_name(const int state);
189
Arnaldo Carvalho de Meloc25a18b2006-03-20 21:58:56 -0800190extern void dccp_set_state(struct sock *sk, const int state);
191extern void dccp_done(struct sock *sk);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700192
Gerrit Renkercf557922006-11-10 16:08:37 -0200193extern void dccp_reqsk_init(struct request_sock *req, struct sk_buff *skb);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700194
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700195extern int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb);
196
197extern struct sock *dccp_create_openreq_child(struct sock *sk,
198 const struct request_sock *req,
199 const struct sk_buff *skb);
200
201extern int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb);
202
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700203extern struct sock *dccp_v4_request_recv_sock(struct sock *sk,
204 struct sk_buff *skb,
205 struct request_sock *req,
206 struct dst_entry *dst);
207extern struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb,
208 struct request_sock *req,
209 struct request_sock **prev);
210
211extern int dccp_child_process(struct sock *parent, struct sock *child,
212 struct sk_buff *skb);
213extern int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
214 struct dccp_hdr *dh, unsigned len);
215extern int dccp_rcv_established(struct sock *sk, struct sk_buff *skb,
216 const struct dccp_hdr *dh, const unsigned len);
217
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -0800218extern int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized);
Arnaldo Carvalho de Melo3e0fadc2006-03-20 21:23:15 -0800219extern int dccp_destroy_sock(struct sock *sk);
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800220
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700221extern void dccp_close(struct sock *sk, long timeout);
222extern struct sk_buff *dccp_make_response(struct sock *sk,
223 struct dst_entry *dst,
224 struct request_sock *req);
225
226extern int dccp_connect(struct sock *sk);
227extern int dccp_disconnect(struct sock *sk, int flags);
Arnaldo Carvalho de Meloc985ed72006-03-20 21:23:39 -0800228extern void dccp_hash(struct sock *sk);
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800229extern void dccp_unhash(struct sock *sk);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700230extern int dccp_getsockopt(struct sock *sk, int level, int optname,
Arnaldo Carvalho de Meloa1d3a352005-08-13 22:42:25 -0300231 char __user *optval, int __user *optlen);
232extern int dccp_setsockopt(struct sock *sk, int level, int optname,
233 char __user *optval, int optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800234#ifdef CONFIG_COMPAT
235extern int compat_dccp_getsockopt(struct sock *sk,
236 int level, int optname,
237 char __user *optval, int __user *optlen);
238extern int compat_dccp_setsockopt(struct sock *sk,
239 int level, int optname,
240 char __user *optval, int optlen);
241#endif
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700242extern int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg);
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -0300243extern int dccp_sendmsg(struct kiocb *iocb, struct sock *sk,
244 struct msghdr *msg, size_t size);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700245extern int dccp_recvmsg(struct kiocb *iocb, struct sock *sk,
246 struct msghdr *msg, size_t len, int nonblock,
247 int flags, int *addr_len);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700248extern void dccp_shutdown(struct sock *sk, int how);
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800249extern int inet_dccp_listen(struct socket *sock, int backlog);
250extern unsigned int dccp_poll(struct file *file, struct socket *sock,
251 poll_table *wait);
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800252extern int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr,
253 int addr_len);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700254
Arnaldo Carvalho de Melo017487d2006-03-20 19:25:24 -0800255extern int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code);
Arnaldo Carvalho de Melo7ad07e72005-08-23 21:50:06 -0700256extern void dccp_send_close(struct sock *sk, const int active);
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800257extern int dccp_invalid_packet(struct sk_buff *skb);
258
259static inline int dccp_bad_service_code(const struct sock *sk,
Andrea Bittau60fe62e2006-03-20 19:23:32 -0800260 const __be32 service)
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800261{
262 const struct dccp_sock *dp = dccp_sk(sk);
263
264 if (dp->dccps_service == service)
265 return 0;
266 return !dccp_list_has_service(dp->dccps_service_list, service);
267}
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700268
269struct dccp_skb_cb {
Arnaldo Carvalho de Melo67e6b622005-09-16 16:58:40 -0700270 __u8 dccpd_type:4;
271 __u8 dccpd_ccval:4;
272 __u8 dccpd_reset_code;
273 __u16 dccpd_opt_len;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700274 __u64 dccpd_seq;
275 __u64 dccpd_ack_seq;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700276};
277
278#define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0]))
279
280static inline int dccp_non_data_packet(const struct sk_buff *skb)
281{
282 const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
283
284 return type == DCCP_PKT_ACK ||
285 type == DCCP_PKT_CLOSE ||
286 type == DCCP_PKT_CLOSEREQ ||
287 type == DCCP_PKT_RESET ||
288 type == DCCP_PKT_SYNC ||
289 type == DCCP_PKT_SYNCACK;
290}
291
292static inline int dccp_packet_without_ack(const struct sk_buff *skb)
293{
294 const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
295
296 return type == DCCP_PKT_DATA || type == DCCP_PKT_REQUEST;
297}
298
299#define DCCP_MAX_SEQNO ((((u64)1) << 48) - 1)
300#define DCCP_PKT_WITHOUT_ACK_SEQ (DCCP_MAX_SEQNO << 2)
301
302static inline void dccp_set_seqno(u64 *seqno, u64 value)
303{
304 if (value > DCCP_MAX_SEQNO)
305 value -= DCCP_MAX_SEQNO + 1;
306 *seqno = value;
307}
308
309static inline u64 dccp_delta_seqno(u64 seqno1, u64 seqno2)
310{
311 return ((seqno2 << 16) - (seqno1 << 16)) >> 16;
312}
313
314static inline void dccp_inc_seqno(u64 *seqno)
315{
316 if (++*seqno > DCCP_MAX_SEQNO)
317 *seqno = 0;
318}
319
320static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss)
321{
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -0300322 struct dccp_hdr_ext *dhx = (struct dccp_hdr_ext *)((void *)dh +
323 sizeof(*dh));
Andrea Bittau60fe62e2006-03-20 19:23:32 -0800324 dh->dccph_seq2 = 0;
325 dh->dccph_seq = htons((gss >> 32) & 0xfffff);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700326 dhx->dccph_seq_low = htonl(gss & 0xffffffff);
327}
328
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -0300329static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack,
330 const u64 gsr)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700331{
Andrea Bittau60fe62e2006-03-20 19:23:32 -0800332 dhack->dccph_reserved1 = 0;
333 dhack->dccph_ack_nr_high = htons(gsr >> 32);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700334 dhack->dccph_ack_nr_low = htonl(gsr & 0xffffffff);
335}
336
337static inline void dccp_update_gsr(struct sock *sk, u64 seq)
338{
339 struct dccp_sock *dp = dccp_sk(sk);
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800340 const struct dccp_minisock *dmsk = dccp_msk(sk);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700341
Arnaldo Carvalho de Melo03ace392005-08-21 05:36:45 -0300342 dp->dccps_gsr = seq;
343 dccp_set_seqno(&dp->dccps_swl,
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800344 dp->dccps_gsr + 1 - (dmsk->dccpms_sequence_window / 4));
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700345 dccp_set_seqno(&dp->dccps_swh,
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800346 dp->dccps_gsr + (3 * dmsk->dccpms_sequence_window) / 4);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700347}
348
349static inline void dccp_update_gss(struct sock *sk, u64 seq)
350{
351 struct dccp_sock *dp = dccp_sk(sk);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700352
Arnaldo Carvalho de Melo03ace392005-08-21 05:36:45 -0300353 dp->dccps_awh = dp->dccps_gss = seq;
354 dccp_set_seqno(&dp->dccps_awl,
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -0300355 (dp->dccps_gss -
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800356 dccp_msk(sk)->dccpms_sequence_window + 1));
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700357}
Arnaldo Carvalho de Meloae31c332005-09-18 00:17:51 -0700358
359static inline int dccp_ack_pending(const struct sock *sk)
360{
361 const struct dccp_sock *dp = dccp_sk(sk);
362 return dp->dccps_timestamp_echo != 0 ||
363#ifdef CONFIG_IP_DCCP_ACKVEC
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800364 (dccp_msk(sk)->dccpms_send_ack_vector &&
Arnaldo Carvalho de Meloae31c332005-09-18 00:17:51 -0700365 dccp_ackvec_pending(dp->dccps_hc_rx_ackvec)) ||
366#endif
367 inet_csk_ack_scheduled(sk);
368}
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700369
Arnaldo Carvalho de Melo2d0817d2006-03-20 22:32:06 -0800370extern int dccp_insert_options(struct sock *sk, struct sk_buff *skb);
371extern int dccp_insert_option_elapsed_time(struct sock *sk,
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700372 struct sk_buff *skb,
373 u32 elapsed_time);
Arnaldo Carvalho de Melo2d0817d2006-03-20 22:32:06 -0800374extern int dccp_insert_option_timestamp(struct sock *sk,
Arnaldo Carvalho de Melod4b81ff2005-08-23 21:51:36 -0700375 struct sk_buff *skb);
Arnaldo Carvalho de Melo2d0817d2006-03-20 22:32:06 -0800376extern int dccp_insert_option(struct sock *sk, struct sk_buff *skb,
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700377 unsigned char option,
378 const void *value, unsigned char len);
379
Arnaldo Carvalho de Melob0e56782005-09-09 02:38:35 -0300380extern void dccp_timestamp(const struct sock *sk, struct timeval *tv);
381
Arnaldo Carvalho de Melob6ee3d42005-08-27 18:18:18 -0300382static inline suseconds_t timeval_usecs(const struct timeval *tv)
383{
384 return tv->tv_sec * USEC_PER_SEC + tv->tv_usec;
385}
386
387static inline suseconds_t timeval_delta(const struct timeval *large,
388 const struct timeval *small)
389{
390 time_t secs = large->tv_sec - small->tv_sec;
391 suseconds_t usecs = large->tv_usec - small->tv_usec;
392
393 if (usecs < 0) {
394 secs--;
395 usecs += USEC_PER_SEC;
396 }
397 return secs * USEC_PER_SEC + usecs;
398}
399
400static inline void timeval_add_usecs(struct timeval *tv,
401 const suseconds_t usecs)
402{
403 tv->tv_usec += usecs;
404 while (tv->tv_usec >= USEC_PER_SEC) {
405 tv->tv_sec++;
406 tv->tv_usec -= USEC_PER_SEC;
407 }
408}
409
410static inline void timeval_sub_usecs(struct timeval *tv,
411 const suseconds_t usecs)
412{
413 tv->tv_usec -= usecs;
414 while (tv->tv_usec < 0) {
415 tv->tv_sec--;
416 tv->tv_usec += USEC_PER_SEC;
417 }
418}
419
Arnaldo Carvalho de Meloe55d9122006-03-20 19:25:02 -0800420#ifdef CONFIG_SYSCTL
421extern int dccp_sysctl_init(void);
422extern void dccp_sysctl_exit(void);
423#else
424static inline int dccp_sysctl_init(void)
425{
426 return 0;
427}
428
429static inline void dccp_sysctl_exit(void)
430{
431}
432#endif
433
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700434#endif /* _DCCP_H */