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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
Gerrit Renker59348b12006-11-20 18:39:23 -020021/*
22 * DCCP - specific warning and debugging macros.
23 */
24#define DCCP_WARN(fmt, a...) LIMIT_NETDEBUG(KERN_WARNING "%s: " fmt, \
YOSHIFUJI Hideakic9eaf172007-02-09 23:24:38 +090025 __FUNCTION__, ##a)
Gerrit Renker59348b12006-11-20 18:39:23 -020026#define DCCP_CRIT(fmt, a...) printk(KERN_CRIT fmt " at %s:%d/%s()\n", ##a, \
27 __FILE__, __LINE__, __FUNCTION__)
28#define DCCP_BUG(a...) do { DCCP_CRIT("BUG: " a); dump_stack(); } while(0)
29#define DCCP_BUG_ON(cond) do { if (unlikely((cond) != 0)) \
30 DCCP_BUG("\"%s\" holds (exception!)", \
31 __stringify(cond)); \
Gerrit Renker3c695262006-11-15 21:27:47 -020032 } while (0)
33
Gerrit Renker84116712006-11-20 18:26:03 -020034#ifdef MODULE
35#define DCCP_PRINTK(enable, fmt, args...) do { if (enable) \
36 printk(fmt, ##args); \
YOSHIFUJI Hideakic9eaf172007-02-09 23:24:38 +090037 } while(0)
Gerrit Renker84116712006-11-20 18:26:03 -020038#else
39#define DCCP_PRINTK(enable, fmt, args...) printk(fmt, ##args)
40#endif
41#define DCCP_PR_DEBUG(enable, fmt, a...) DCCP_PRINTK(enable, KERN_DEBUG \
42 "%s: " fmt, __FUNCTION__, ##a)
43
Arnaldo Carvalho de Melo725ba8e2005-08-13 20:35:39 -030044#ifdef CONFIG_IP_DCCP_DEBUG
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070045extern int dccp_debug;
Gerrit Renker84116712006-11-20 18:26:03 -020046#define dccp_pr_debug(format, a...) DCCP_PR_DEBUG(dccp_debug, format, ##a)
47#define dccp_pr_debug_cat(format, a...) DCCP_PRINTK(dccp_debug, format, ##a)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070048#else
49#define dccp_pr_debug(format, a...)
50#define dccp_pr_debug_cat(format, a...)
51#endif
52
53extern struct inet_hashinfo dccp_hashinfo;
54
55extern atomic_t dccp_orphan_count;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070056
57extern void dccp_time_wait(struct sock *sk, int state, int timeo);
58
Gerrit Renker60361be2006-11-10 02:13:56 -020059/*
60 * Set safe upper bounds for header and option length. Since Data Offset is 8
61 * bits (RFC 4340, sec. 5.1), the total header length can never be more than
62 * 4 * 255 = 1020 bytes. The largest possible header length is 28 bytes (X=1):
63 * - DCCP-Response with ACK Subheader and 4 bytes of Service code OR
64 * - DCCP-Reset with ACK Subheader and 4 bytes of Reset Code fields
65 * Hence a safe upper bound for the maximum option length is 1020-28 = 992
66 */
67#define MAX_DCCP_SPECIFIC_HEADER (255 * sizeof(int))
68#define DCCP_MAX_PACKET_HDR 28
69#define DCCP_MAX_OPT_LEN (MAX_DCCP_SPECIFIC_HEADER - DCCP_MAX_PACKET_HDR)
70#define MAX_DCCP_HEADER (MAX_DCCP_SPECIFIC_HEADER + MAX_HEADER)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070071
72#define DCCP_TIMEWAIT_LEN (60 * HZ) /* how long to wait to destroy TIME-WAIT
73 * state, about 60 seconds */
74
Gerrit Renker0e64e942006-10-24 16:17:51 -070075/* RFC 1122, 4.2.3.1 initial RTO value */
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070076#define DCCP_TIMEOUT_INIT ((unsigned)(3 * HZ))
77
78/* Maximal interval between probes for local resources. */
79#define DCCP_RESOURCE_PROBE_INTERVAL ((unsigned)(HZ / 2U))
80
81#define DCCP_RTO_MAX ((unsigned)(120 * HZ)) /* FIXME: using TCP value */
82
Gerrit Renker2e2e9e92006-11-13 13:23:52 -020083/* sysctl variables for DCCP */
84extern int sysctl_dccp_request_retries;
85extern int sysctl_dccp_retries1;
86extern int sysctl_dccp_retries2;
Gerrit Renkerafb0a342006-11-13 13:25:41 -020087extern int sysctl_dccp_feat_sequence_window;
88extern int sysctl_dccp_feat_rx_ccid;
89extern int sysctl_dccp_feat_tx_ccid;
90extern int sysctl_dccp_feat_ack_ratio;
91extern int sysctl_dccp_feat_send_ack_vector;
92extern int sysctl_dccp_feat_send_ndp_count;
Ian McDonaldb1308dc2006-11-20 18:30:17 -020093extern int sysctl_dccp_tx_qlen;
Gerrit Renker2e2e9e92006-11-13 13:23:52 -020094
Gerrit Renker6b811d42007-03-20 12:26:51 -030095/*
96 * 48-bit sequence number arithmetic (signed and unsigned)
97 */
98#define INT48_MIN 0x800000000000LL /* 2^47 */
99#define UINT48_MAX 0xFFFFFFFFFFFFLL /* 2^48 - 1 */
100#define COMPLEMENT48(x) (0x1000000000000LL - (x)) /* 2^48 - x */
101#define TO_SIGNED48(x) (((x) < INT48_MIN)? (x) : -COMPLEMENT48( (x)))
102#define TO_UNSIGNED48(x) (((x) >= 0)? (x) : COMPLEMENT48(-(x)))
103#define ADD48(a, b) (((a) + (b)) & UINT48_MAX)
104#define SUB48(a, b) ADD48((a), COMPLEMENT48(b))
105
106static inline void dccp_set_seqno(u64 *seqno, u64 value)
107{
108 *seqno = value & UINT48_MAX;
109}
110
111static inline void dccp_inc_seqno(u64 *seqno)
112{
113 *seqno = ADD48(*seqno, 1);
114}
115
Gerrit Renker0aec51c2007-03-20 12:45:59 -0300116/* signed mod-2^48 distance: pos. if seqno1 < seqno2, neg. if seqno1 > seqno2 */
117static inline s64 dccp_delta_seqno(const u64 seqno1, const u64 seqno2)
Gerrit Renker6b811d42007-03-20 12:26:51 -0300118{
Gerrit Renker0aec51c2007-03-20 12:45:59 -0300119 u64 delta = SUB48(seqno2, seqno1);
120
121 return TO_SIGNED48(delta);
Gerrit Renker6b811d42007-03-20 12:26:51 -0300122}
123
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700124/* is seq1 < seq2 ? */
Patrick McHardya10cedd2005-08-14 21:05:53 -0300125static inline int before48(const u64 seq1, const u64 seq2)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700126{
Gerrit Renkerd52de172007-03-20 13:00:26 -0300127 return (s64)((seq2 << 16) - (seq1 << 16)) > 0;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700128}
129
130/* is seq1 > seq2 ? */
Gerrit Renkerd52de172007-03-20 13:00:26 -0300131#define after48(seq1, seq2) before48(seq2, seq1)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700132
133/* is seq2 <= seq1 <= seq3 ? */
Patrick McHardya10cedd2005-08-14 21:05:53 -0300134static inline int between48(const u64 seq1, const u64 seq2, const u64 seq3)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700135{
136 return (seq3 << 16) - (seq2 << 16) >= (seq1 << 16) - (seq2 << 16);
137}
138
139static inline u64 max48(const u64 seq1, const u64 seq2)
140{
141 return after48(seq1, seq2) ? seq1 : seq2;
142}
143
Ian McDonald837d1072006-08-26 19:06:42 -0700144/* is seq1 next seqno after seq2 */
145static inline int follows48(const u64 seq1, const u64 seq2)
146{
147 int diff = (seq1 & 0xFFFF) - (seq2 & 0xFFFF);
148
149 return diff==1;
150}
151
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700152enum {
153 DCCP_MIB_NUM = 0,
154 DCCP_MIB_ACTIVEOPENS, /* ActiveOpens */
155 DCCP_MIB_ESTABRESETS, /* EstabResets */
156 DCCP_MIB_CURRESTAB, /* CurrEstab */
YOSHIFUJI Hideakic9eaf172007-02-09 23:24:38 +0900157 DCCP_MIB_OUTSEGS, /* OutSegs */
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700158 DCCP_MIB_OUTRSTS,
159 DCCP_MIB_ABORTONTIMEOUT,
160 DCCP_MIB_TIMEOUTS,
161 DCCP_MIB_ABORTFAILED,
162 DCCP_MIB_PASSIVEOPENS,
163 DCCP_MIB_ATTEMPTFAILS,
164 DCCP_MIB_OUTDATAGRAMS,
165 DCCP_MIB_INERRS,
166 DCCP_MIB_OPTMANDATORYERROR,
167 DCCP_MIB_INVALIDOPT,
168 __DCCP_MIB_MAX
169};
170
171#define DCCP_MIB_MAX __DCCP_MIB_MAX
172struct dccp_mib {
173 unsigned long mibs[DCCP_MIB_MAX];
174} __SNMP_MIB_ALIGN__;
175
176DECLARE_SNMP_STAT(struct dccp_mib, dccp_statistics);
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -0300177#define DCCP_INC_STATS(field) SNMP_INC_STATS(dccp_statistics, field)
178#define DCCP_INC_STATS_BH(field) SNMP_INC_STATS_BH(dccp_statistics, field)
179#define DCCP_INC_STATS_USER(field) SNMP_INC_STATS_USER(dccp_statistics, field)
180#define DCCP_DEC_STATS(field) SNMP_DEC_STATS(dccp_statistics, field)
181#define DCCP_ADD_STATS_BH(field, val) \
182 SNMP_ADD_STATS_BH(dccp_statistics, field, val)
183#define DCCP_ADD_STATS_USER(field, val) \
184 SNMP_ADD_STATS_USER(dccp_statistics, field, val)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700185
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200186/*
187 * Checksumming routines
188 */
189static inline int dccp_csum_coverage(const struct sk_buff *skb)
190{
191 const struct dccp_hdr* dh = dccp_hdr(skb);
192
193 if (dh->dccph_cscov == 0)
194 return skb->len;
195 return (dh->dccph_doff + dh->dccph_cscov - 1) * sizeof(u32);
196}
197
198static inline void dccp_csum_outgoing(struct sk_buff *skb)
199{
200 int cov = dccp_csum_coverage(skb);
201
202 if (cov >= skb->len)
203 dccp_hdr(skb)->dccph_cscov = 0;
204
205 skb->csum = skb_checksum(skb, 0, (cov > skb->len)? skb->len : cov, 0);
206}
207
208extern void dccp_v4_send_check(struct sock *sk, int len, struct sk_buff *skb);
209
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700210extern int dccp_retransmit_skb(struct sock *sk, struct sk_buff *skb);
211
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700212extern void dccp_send_ack(struct sock *sk);
213extern void dccp_send_delayed_ack(struct sock *sk);
Gerrit Renker8a73cd02006-11-10 12:32:01 -0200214extern void dccp_reqsk_send_ack(struct sk_buff *sk, struct request_sock *rsk);
215
Arnaldo Carvalho de Meloe92ae932005-08-17 03:10:59 -0300216extern void dccp_send_sync(struct sock *sk, const u64 seq,
217 const enum dccp_pkt_type pkt_type);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700218
Ian McDonald97e58482006-08-26 19:16:45 -0700219extern void dccp_write_xmit(struct sock *sk, int block);
Arnaldo Carvalho de Meloc530cfb2005-08-29 02:15:54 -0300220extern void dccp_write_space(struct sock *sk);
Arnaldo Carvalho de Melo27258ee2005-08-09 20:30:56 -0700221
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700222extern void dccp_init_xmit_timers(struct sock *sk);
223static inline void dccp_clear_xmit_timers(struct sock *sk)
224{
225 inet_csk_clear_xmit_timers(sk);
226}
227
228extern unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu);
229
230extern const char *dccp_packet_name(const int type);
231extern const char *dccp_state_name(const int state);
232
Arnaldo Carvalho de Meloc25a18b2006-03-20 21:58:56 -0800233extern void dccp_set_state(struct sock *sk, const int state);
234extern void dccp_done(struct sock *sk);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700235
Gerrit Renkercf557922006-11-10 16:08:37 -0200236extern void dccp_reqsk_init(struct request_sock *req, struct sk_buff *skb);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700237
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700238extern int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb);
239
240extern struct sock *dccp_create_openreq_child(struct sock *sk,
241 const struct request_sock *req,
242 const struct sk_buff *skb);
243
244extern int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb);
245
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700246extern struct sock *dccp_v4_request_recv_sock(struct sock *sk,
247 struct sk_buff *skb,
248 struct request_sock *req,
249 struct dst_entry *dst);
250extern struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb,
251 struct request_sock *req,
252 struct request_sock **prev);
253
254extern int dccp_child_process(struct sock *parent, struct sock *child,
255 struct sk_buff *skb);
256extern int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
257 struct dccp_hdr *dh, unsigned len);
258extern int dccp_rcv_established(struct sock *sk, struct sk_buff *skb,
259 const struct dccp_hdr *dh, const unsigned len);
260
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -0800261extern int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized);
Arnaldo Carvalho de Melo3e0fadc2006-03-20 21:23:15 -0800262extern int dccp_destroy_sock(struct sock *sk);
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800263
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700264extern void dccp_close(struct sock *sk, long timeout);
265extern struct sk_buff *dccp_make_response(struct sock *sk,
266 struct dst_entry *dst,
267 struct request_sock *req);
268
269extern int dccp_connect(struct sock *sk);
270extern int dccp_disconnect(struct sock *sk, int flags);
Arnaldo Carvalho de Meloc985ed72006-03-20 21:23:39 -0800271extern void dccp_hash(struct sock *sk);
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800272extern void dccp_unhash(struct sock *sk);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700273extern int dccp_getsockopt(struct sock *sk, int level, int optname,
Arnaldo Carvalho de Meloa1d3a352005-08-13 22:42:25 -0300274 char __user *optval, int __user *optlen);
275extern int dccp_setsockopt(struct sock *sk, int level, int optname,
276 char __user *optval, int optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800277#ifdef CONFIG_COMPAT
278extern int compat_dccp_getsockopt(struct sock *sk,
279 int level, int optname,
280 char __user *optval, int __user *optlen);
281extern int compat_dccp_setsockopt(struct sock *sk,
282 int level, int optname,
283 char __user *optval, int optlen);
284#endif
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700285extern int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg);
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -0300286extern int dccp_sendmsg(struct kiocb *iocb, struct sock *sk,
287 struct msghdr *msg, size_t size);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700288extern int dccp_recvmsg(struct kiocb *iocb, struct sock *sk,
289 struct msghdr *msg, size_t len, int nonblock,
290 int flags, int *addr_len);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700291extern void dccp_shutdown(struct sock *sk, int how);
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800292extern int inet_dccp_listen(struct socket *sock, int backlog);
293extern unsigned int dccp_poll(struct file *file, struct socket *sock,
294 poll_table *wait);
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800295extern int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr,
296 int addr_len);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700297
Arnaldo Carvalho de Melo017487d2006-03-20 19:25:24 -0800298extern int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code);
Arnaldo Carvalho de Melo7ad07e72005-08-23 21:50:06 -0700299extern void dccp_send_close(struct sock *sk, const int active);
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800300extern int dccp_invalid_packet(struct sk_buff *skb);
301
302static inline int dccp_bad_service_code(const struct sock *sk,
Andrea Bittau60fe62e2006-03-20 19:23:32 -0800303 const __be32 service)
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800304{
305 const struct dccp_sock *dp = dccp_sk(sk);
306
307 if (dp->dccps_service == service)
308 return 0;
309 return !dccp_list_has_service(dp->dccps_service_list, service);
310}
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700311
312struct dccp_skb_cb {
Arnaldo Carvalho de Melo67e6b622005-09-16 16:58:40 -0700313 __u8 dccpd_type:4;
314 __u8 dccpd_ccval:4;
315 __u8 dccpd_reset_code;
316 __u16 dccpd_opt_len;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700317 __u64 dccpd_seq;
318 __u64 dccpd_ack_seq;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700319};
320
321#define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0]))
322
323static inline int dccp_non_data_packet(const struct sk_buff *skb)
324{
325 const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
326
327 return type == DCCP_PKT_ACK ||
328 type == DCCP_PKT_CLOSE ||
329 type == DCCP_PKT_CLOSEREQ ||
330 type == DCCP_PKT_RESET ||
331 type == DCCP_PKT_SYNC ||
332 type == DCCP_PKT_SYNCACK;
333}
334
335static inline int dccp_packet_without_ack(const struct sk_buff *skb)
336{
337 const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
338
339 return type == DCCP_PKT_DATA || type == DCCP_PKT_REQUEST;
340}
341
Gerrit Renker6b811d42007-03-20 12:26:51 -0300342#define DCCP_PKT_WITHOUT_ACK_SEQ (UINT48_MAX << 2)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700343
344static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss)
345{
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -0300346 struct dccp_hdr_ext *dhx = (struct dccp_hdr_ext *)((void *)dh +
347 sizeof(*dh));
Andrea Bittau60fe62e2006-03-20 19:23:32 -0800348 dh->dccph_seq2 = 0;
349 dh->dccph_seq = htons((gss >> 32) & 0xfffff);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700350 dhx->dccph_seq_low = htonl(gss & 0xffffffff);
351}
352
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -0300353static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack,
354 const u64 gsr)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700355{
Andrea Bittau60fe62e2006-03-20 19:23:32 -0800356 dhack->dccph_reserved1 = 0;
357 dhack->dccph_ack_nr_high = htons(gsr >> 32);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700358 dhack->dccph_ack_nr_low = htonl(gsr & 0xffffffff);
359}
360
361static inline void dccp_update_gsr(struct sock *sk, u64 seq)
362{
363 struct dccp_sock *dp = dccp_sk(sk);
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800364 const struct dccp_minisock *dmsk = dccp_msk(sk);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700365
Arnaldo Carvalho de Melo03ace392005-08-21 05:36:45 -0300366 dp->dccps_gsr = seq;
367 dccp_set_seqno(&dp->dccps_swl,
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800368 dp->dccps_gsr + 1 - (dmsk->dccpms_sequence_window / 4));
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700369 dccp_set_seqno(&dp->dccps_swh,
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800370 dp->dccps_gsr + (3 * dmsk->dccpms_sequence_window) / 4);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700371}
372
373static inline void dccp_update_gss(struct sock *sk, u64 seq)
374{
375 struct dccp_sock *dp = dccp_sk(sk);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700376
Arnaldo Carvalho de Melo03ace392005-08-21 05:36:45 -0300377 dp->dccps_awh = dp->dccps_gss = seq;
378 dccp_set_seqno(&dp->dccps_awl,
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -0300379 (dp->dccps_gss -
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800380 dccp_msk(sk)->dccpms_sequence_window + 1));
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700381}
YOSHIFUJI Hideakic9eaf172007-02-09 23:24:38 +0900382
Arnaldo Carvalho de Meloae31c332005-09-18 00:17:51 -0700383static inline int dccp_ack_pending(const struct sock *sk)
384{
385 const struct dccp_sock *dp = dccp_sk(sk);
386 return dp->dccps_timestamp_echo != 0 ||
387#ifdef CONFIG_IP_DCCP_ACKVEC
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800388 (dccp_msk(sk)->dccpms_send_ack_vector &&
Arnaldo Carvalho de Meloae31c332005-09-18 00:17:51 -0700389 dccp_ackvec_pending(dp->dccps_hc_rx_ackvec)) ||
390#endif
391 inet_csk_ack_scheduled(sk);
392}
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700393
Arnaldo Carvalho de Melo2d0817d2006-03-20 22:32:06 -0800394extern int dccp_insert_options(struct sock *sk, struct sk_buff *skb);
395extern int dccp_insert_option_elapsed_time(struct sock *sk,
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700396 struct sk_buff *skb,
397 u32 elapsed_time);
Arnaldo Carvalho de Melo2d0817d2006-03-20 22:32:06 -0800398extern int dccp_insert_option_timestamp(struct sock *sk,
Arnaldo Carvalho de Melod4b81ff2005-08-23 21:51:36 -0700399 struct sk_buff *skb);
Arnaldo Carvalho de Melo2d0817d2006-03-20 22:32:06 -0800400extern int dccp_insert_option(struct sock *sk, struct sk_buff *skb,
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700401 unsigned char option,
402 const void *value, unsigned char len);
403
Arnaldo Carvalho de Melob0e56782005-09-09 02:38:35 -0300404extern void dccp_timestamp(const struct sock *sk, struct timeval *tv);
405
Arnaldo Carvalho de Melob6ee3d42005-08-27 18:18:18 -0300406static inline suseconds_t timeval_usecs(const struct timeval *tv)
407{
408 return tv->tv_sec * USEC_PER_SEC + tv->tv_usec;
409}
410
411static inline suseconds_t timeval_delta(const struct timeval *large,
412 const struct timeval *small)
413{
414 time_t secs = large->tv_sec - small->tv_sec;
415 suseconds_t usecs = large->tv_usec - small->tv_usec;
416
417 if (usecs < 0) {
418 secs--;
419 usecs += USEC_PER_SEC;
420 }
421 return secs * USEC_PER_SEC + usecs;
422}
423
424static inline void timeval_add_usecs(struct timeval *tv,
425 const suseconds_t usecs)
426{
427 tv->tv_usec += usecs;
428 while (tv->tv_usec >= USEC_PER_SEC) {
429 tv->tv_sec++;
430 tv->tv_usec -= USEC_PER_SEC;
431 }
432}
433
434static inline void timeval_sub_usecs(struct timeval *tv,
435 const suseconds_t usecs)
436{
437 tv->tv_usec -= usecs;
438 while (tv->tv_usec < 0) {
439 tv->tv_sec--;
440 tv->tv_usec += USEC_PER_SEC;
441 }
Gerrit Renker0f9e5b52006-12-10 00:03:51 -0200442 DCCP_BUG_ON(tv->tv_sec < 0);
Arnaldo Carvalho de Melob6ee3d42005-08-27 18:18:18 -0300443}
444
Arnaldo Carvalho de Meloe55d9122006-03-20 19:25:02 -0800445#ifdef CONFIG_SYSCTL
446extern int dccp_sysctl_init(void);
447extern void dccp_sysctl_exit(void);
448#else
449static inline int dccp_sysctl_init(void)
450{
451 return 0;
452}
453
454static inline void dccp_sysctl_exit(void)
455{
456}
457#endif
458
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700459#endif /* _DCCP_H */