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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>
Arnaldo Carvalho de Melo9823b7b2007-08-19 17:16:35 -070016#include <linux/ktime.h>
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070017#include <net/snmp.h>
18#include <net/sock.h>
19#include <net/tcp.h>
Arnaldo Carvalho de Meloae31c332005-09-18 00:17:51 -070020#include "ackvec.h"
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070021
Gerrit Renker59348b12006-11-20 18:39:23 -020022/*
23 * DCCP - specific warning and debugging macros.
24 */
25#define DCCP_WARN(fmt, a...) LIMIT_NETDEBUG(KERN_WARNING "%s: " fmt, \
YOSHIFUJI Hideakic9eaf172007-02-09 23:24:38 +090026 __FUNCTION__, ##a)
Gerrit Renker59348b12006-11-20 18:39:23 -020027#define DCCP_CRIT(fmt, a...) printk(KERN_CRIT fmt " at %s:%d/%s()\n", ##a, \
28 __FILE__, __LINE__, __FUNCTION__)
29#define DCCP_BUG(a...) do { DCCP_CRIT("BUG: " a); dump_stack(); } while(0)
30#define DCCP_BUG_ON(cond) do { if (unlikely((cond) != 0)) \
31 DCCP_BUG("\"%s\" holds (exception!)", \
32 __stringify(cond)); \
Gerrit Renker3c695262006-11-15 21:27:47 -020033 } while (0)
34
Gerrit Renker84116712006-11-20 18:26:03 -020035#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#define DCCP_PR_DEBUG(enable, fmt, a...) DCCP_PRINTK(enable, KERN_DEBUG \
39 "%s: " fmt, __FUNCTION__, ##a)
40
Arnaldo Carvalho de Melo725ba8e2005-08-13 20:35:39 -030041#ifdef CONFIG_IP_DCCP_DEBUG
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070042extern int dccp_debug;
Gerrit Renker84116712006-11-20 18:26:03 -020043#define dccp_pr_debug(format, a...) DCCP_PR_DEBUG(dccp_debug, format, ##a)
44#define dccp_pr_debug_cat(format, a...) DCCP_PRINTK(dccp_debug, format, ##a)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070045#else
46#define dccp_pr_debug(format, a...)
47#define dccp_pr_debug_cat(format, a...)
48#endif
49
50extern struct inet_hashinfo dccp_hashinfo;
51
52extern atomic_t dccp_orphan_count;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070053
54extern void dccp_time_wait(struct sock *sk, int state, int timeo);
55
Gerrit Renker60361be2006-11-10 02:13:56 -020056/*
57 * Set safe upper bounds for header and option length. Since Data Offset is 8
58 * bits (RFC 4340, sec. 5.1), the total header length can never be more than
59 * 4 * 255 = 1020 bytes. The largest possible header length is 28 bytes (X=1):
60 * - DCCP-Response with ACK Subheader and 4 bytes of Service code OR
61 * - DCCP-Reset with ACK Subheader and 4 bytes of Reset Code fields
62 * Hence a safe upper bound for the maximum option length is 1020-28 = 992
63 */
64#define MAX_DCCP_SPECIFIC_HEADER (255 * sizeof(int))
65#define DCCP_MAX_PACKET_HDR 28
66#define DCCP_MAX_OPT_LEN (MAX_DCCP_SPECIFIC_HEADER - DCCP_MAX_PACKET_HDR)
67#define MAX_DCCP_HEADER (MAX_DCCP_SPECIFIC_HEADER + MAX_HEADER)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070068
69#define DCCP_TIMEWAIT_LEN (60 * HZ) /* how long to wait to destroy TIME-WAIT
70 * state, about 60 seconds */
71
Gerrit Renker0e64e942006-10-24 16:17:51 -070072/* RFC 1122, 4.2.3.1 initial RTO value */
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070073#define DCCP_TIMEOUT_INIT ((unsigned)(3 * HZ))
74
Gerrit Renker4712a792007-03-20 15:23:18 -030075#define DCCP_RTO_MAX ((unsigned)(120 * HZ)) /* FIXME: using TCP value */
76
77/* bounds for sampled RTT values from packet exchanges (in usec) */
78#define DCCP_SANE_RTT_MIN 100
79#define DCCP_SANE_RTT_MAX (4 * USEC_PER_SEC)
80
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070081/* Maximal interval between probes for local resources. */
82#define DCCP_RESOURCE_PROBE_INTERVAL ((unsigned)(HZ / 2U))
83
Gerrit Renker2e2e9e92006-11-13 13:23:52 -020084/* sysctl variables for DCCP */
85extern int sysctl_dccp_request_retries;
86extern int sysctl_dccp_retries1;
87extern int sysctl_dccp_retries2;
Gerrit Renkerafb0a34d2006-11-13 13:25:41 -020088extern int sysctl_dccp_feat_sequence_window;
89extern int sysctl_dccp_feat_rx_ccid;
90extern int sysctl_dccp_feat_tx_ccid;
91extern int sysctl_dccp_feat_ack_ratio;
92extern int sysctl_dccp_feat_send_ack_vector;
93extern int sysctl_dccp_feat_send_ndp_count;
Ian McDonaldb1308dc2006-11-20 18:30:17 -020094extern int sysctl_dccp_tx_qlen;
Gerrit Renkera94f0f92007-09-26 11:31:49 -030095extern int sysctl_dccp_sync_ratelimit;
Gerrit Renker2e2e9e92006-11-13 13:23:52 -020096
Gerrit Renker6b811d42007-03-20 12:26:51 -030097/*
98 * 48-bit sequence number arithmetic (signed and unsigned)
99 */
100#define INT48_MIN 0x800000000000LL /* 2^47 */
101#define UINT48_MAX 0xFFFFFFFFFFFFLL /* 2^48 - 1 */
102#define COMPLEMENT48(x) (0x1000000000000LL - (x)) /* 2^48 - x */
103#define TO_SIGNED48(x) (((x) < INT48_MIN)? (x) : -COMPLEMENT48( (x)))
104#define TO_UNSIGNED48(x) (((x) >= 0)? (x) : COMPLEMENT48(-(x)))
105#define ADD48(a, b) (((a) + (b)) & UINT48_MAX)
106#define SUB48(a, b) ADD48((a), COMPLEMENT48(b))
107
108static inline void dccp_set_seqno(u64 *seqno, u64 value)
109{
110 *seqno = value & UINT48_MAX;
111}
112
113static inline void dccp_inc_seqno(u64 *seqno)
114{
115 *seqno = ADD48(*seqno, 1);
116}
117
Gerrit Renker0aec51c2007-03-20 12:45:59 -0300118/* signed mod-2^48 distance: pos. if seqno1 < seqno2, neg. if seqno1 > seqno2 */
119static inline s64 dccp_delta_seqno(const u64 seqno1, const u64 seqno2)
Gerrit Renker6b811d42007-03-20 12:26:51 -0300120{
Gerrit Renker0aec51c2007-03-20 12:45:59 -0300121 u64 delta = SUB48(seqno2, seqno1);
122
123 return TO_SIGNED48(delta);
Gerrit Renker6b811d42007-03-20 12:26:51 -0300124}
125
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700126/* is seq1 < seq2 ? */
Patrick McHardya10cedd2005-08-14 21:05:53 -0300127static inline int before48(const u64 seq1, const u64 seq2)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700128{
Gerrit Renkerd52de172007-03-20 13:00:26 -0300129 return (s64)((seq2 << 16) - (seq1 << 16)) > 0;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700130}
131
132/* is seq1 > seq2 ? */
Gerrit Renkerd52de172007-03-20 13:00:26 -0300133#define after48(seq1, seq2) before48(seq2, seq1)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700134
135/* is seq2 <= seq1 <= seq3 ? */
Patrick McHardya10cedd2005-08-14 21:05:53 -0300136static inline int between48(const u64 seq1, const u64 seq2, const u64 seq3)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700137{
138 return (seq3 << 16) - (seq2 << 16) >= (seq1 << 16) - (seq2 << 16);
139}
140
141static inline u64 max48(const u64 seq1, const u64 seq2)
142{
143 return after48(seq1, seq2) ? seq1 : seq2;
144}
145
Ian McDonald837d1072006-08-26 19:06:42 -0700146/* is seq1 next seqno after seq2 */
147static inline int follows48(const u64 seq1, const u64 seq2)
148{
Gerrit Renkerb16be512007-03-20 13:03:47 -0300149 return dccp_delta_seqno(seq2, seq1) == 1;
Ian McDonald837d1072006-08-26 19:06:42 -0700150}
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 */
Ian McDonalde9618112007-05-28 16:32:26 -0300189static inline unsigned int dccp_csum_coverage(const struct sk_buff *skb)
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200190{
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{
Ian McDonalde9618112007-05-28 16:32:26 -0300200 unsigned int cov = dccp_csum_coverage(skb);
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200201
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);
Gerrit Renker8a73cd02006-11-10 12:32:01 -0200213extern void dccp_reqsk_send_ack(struct sk_buff *sk, struct request_sock *rsk);
214
Arnaldo Carvalho de Meloe92ae932005-08-17 03:10:59 -0300215extern void dccp_send_sync(struct sock *sk, const u64 seq,
216 const enum dccp_pkt_type pkt_type);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700217
Ian McDonald97e58482006-08-26 19:16:45 -0700218extern void dccp_write_xmit(struct sock *sk, int block);
Arnaldo Carvalho de Meloc530cfb2005-08-29 02:15:54 -0300219extern void dccp_write_space(struct sock *sk);
Arnaldo Carvalho de Melo27258ee2005-08-09 20:30:56 -0700220
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700221extern void dccp_init_xmit_timers(struct sock *sk);
222static inline void dccp_clear_xmit_timers(struct sock *sk)
223{
224 inet_csk_clear_xmit_timers(sk);
225}
226
227extern unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu);
228
229extern const char *dccp_packet_name(const int type);
230extern const char *dccp_state_name(const int state);
231
Arnaldo Carvalho de Meloc25a18b2006-03-20 21:58:56 -0800232extern void dccp_set_state(struct sock *sk, const int state);
233extern void dccp_done(struct sock *sk);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700234
Gerrit Renkercf557922006-11-10 16:08:37 -0200235extern void dccp_reqsk_init(struct request_sock *req, struct sk_buff *skb);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700236
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700237extern int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb);
238
239extern struct sock *dccp_create_openreq_child(struct sock *sk,
240 const struct request_sock *req,
241 const struct sk_buff *skb);
242
243extern int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb);
244
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700245extern struct sock *dccp_v4_request_recv_sock(struct sock *sk,
246 struct sk_buff *skb,
247 struct request_sock *req,
248 struct dst_entry *dst);
249extern struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb,
250 struct request_sock *req,
251 struct request_sock **prev);
252
253extern int dccp_child_process(struct sock *parent, struct sock *child,
254 struct sk_buff *skb);
255extern int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
256 struct dccp_hdr *dh, unsigned len);
257extern int dccp_rcv_established(struct sock *sk, struct sk_buff *skb,
258 const struct dccp_hdr *dh, const unsigned len);
259
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -0800260extern int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized);
Arnaldo Carvalho de Melo3e0fadc2006-03-20 21:23:15 -0800261extern int dccp_destroy_sock(struct sock *sk);
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800262
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700263extern void dccp_close(struct sock *sk, long timeout);
264extern struct sk_buff *dccp_make_response(struct sock *sk,
265 struct dst_entry *dst,
266 struct request_sock *req);
267
268extern int dccp_connect(struct sock *sk);
269extern int dccp_disconnect(struct sock *sk, int flags);
Arnaldo Carvalho de Meloc985ed72006-03-20 21:23:39 -0800270extern void dccp_hash(struct sock *sk);
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800271extern void dccp_unhash(struct sock *sk);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700272extern int dccp_getsockopt(struct sock *sk, int level, int optname,
Arnaldo Carvalho de Meloa1d3a352005-08-13 22:42:25 -0300273 char __user *optval, int __user *optlen);
274extern int dccp_setsockopt(struct sock *sk, int level, int optname,
275 char __user *optval, int optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800276#ifdef CONFIG_COMPAT
277extern int compat_dccp_getsockopt(struct sock *sk,
278 int level, int optname,
279 char __user *optval, int __user *optlen);
280extern int compat_dccp_setsockopt(struct sock *sk,
281 int level, int optname,
282 char __user *optval, int optlen);
283#endif
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700284extern int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg);
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -0300285extern int dccp_sendmsg(struct kiocb *iocb, struct sock *sk,
286 struct msghdr *msg, size_t size);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700287extern int dccp_recvmsg(struct kiocb *iocb, struct sock *sk,
288 struct msghdr *msg, size_t len, int nonblock,
289 int flags, int *addr_len);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700290extern void dccp_shutdown(struct sock *sk, int how);
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800291extern int inet_dccp_listen(struct socket *sock, int backlog);
292extern unsigned int dccp_poll(struct file *file, struct socket *sock,
293 poll_table *wait);
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800294extern int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr,
295 int addr_len);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700296
Gerrit Renkere356d372007-09-26 14:35:19 -0300297extern struct sk_buff *dccp_ctl_make_reset(struct socket *ctl,
298 struct sk_buff *skb);
Arnaldo Carvalho de Melo017487d2006-03-20 19:25:24 -0800299extern int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code);
Arnaldo Carvalho de Melo7ad07e72005-08-23 21:50:06 -0700300extern void dccp_send_close(struct sock *sk, const int active);
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800301extern int dccp_invalid_packet(struct sk_buff *skb);
Gerrit Renker3393da82007-09-25 22:40:44 -0700302extern u32 dccp_sample_rtt(struct sock *sk, long delta);
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800303
304static inline int dccp_bad_service_code(const struct sock *sk,
Andrea Bittau60fe62e2006-03-20 19:23:32 -0800305 const __be32 service)
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800306{
307 const struct dccp_sock *dp = dccp_sk(sk);
308
309 if (dp->dccps_service == service)
310 return 0;
311 return !dccp_list_has_service(dp->dccps_service_list, service);
312}
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700313
Gerrit Renker0430ee32007-09-26 11:27:56 -0300314/**
315 * dccp_skb_cb - DCCP per-packet control information
316 * @dccpd_type: one of %dccp_pkt_type (or unknown)
317 * @dccpd_ccval: CCVal field (5.1), see e.g. RFC 4342, 8.1
318 * @dccpd_reset_code: one of %dccp_reset_codes
319 * @dccpd_reset_data: Data1..3 fields (depend on @dccpd_reset_code)
320 * @dccpd_opt_len: total length of all options (5.8) in the packet
321 * @dccpd_seq: sequence number
322 * @dccpd_ack_seq: acknowledgment number subheader field value
323 * This is used for transmission as well as for reception.
324 */
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700325struct dccp_skb_cb {
Arnaldo Carvalho de Melo67e6b622005-09-16 16:58:40 -0700326 __u8 dccpd_type:4;
327 __u8 dccpd_ccval:4;
Gerrit Renker0430ee32007-09-26 11:27:56 -0300328 __u8 dccpd_reset_code,
329 dccpd_reset_data[3];
Arnaldo Carvalho de Melo67e6b622005-09-16 16:58:40 -0700330 __u16 dccpd_opt_len;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700331 __u64 dccpd_seq;
332 __u64 dccpd_ack_seq;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700333};
334
335#define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0]))
336
337static inline int dccp_non_data_packet(const struct sk_buff *skb)
338{
339 const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
340
341 return type == DCCP_PKT_ACK ||
342 type == DCCP_PKT_CLOSE ||
343 type == DCCP_PKT_CLOSEREQ ||
344 type == DCCP_PKT_RESET ||
345 type == DCCP_PKT_SYNC ||
346 type == DCCP_PKT_SYNCACK;
347}
348
349static inline int dccp_packet_without_ack(const struct sk_buff *skb)
350{
351 const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
352
353 return type == DCCP_PKT_DATA || type == DCCP_PKT_REQUEST;
354}
355
Gerrit Renker6b811d42007-03-20 12:26:51 -0300356#define DCCP_PKT_WITHOUT_ACK_SEQ (UINT48_MAX << 2)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700357
358static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss)
359{
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -0300360 struct dccp_hdr_ext *dhx = (struct dccp_hdr_ext *)((void *)dh +
361 sizeof(*dh));
Andrea Bittau60fe62e2006-03-20 19:23:32 -0800362 dh->dccph_seq2 = 0;
363 dh->dccph_seq = htons((gss >> 32) & 0xfffff);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700364 dhx->dccph_seq_low = htonl(gss & 0xffffffff);
365}
366
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -0300367static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack,
368 const u64 gsr)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700369{
Andrea Bittau60fe62e2006-03-20 19:23:32 -0800370 dhack->dccph_reserved1 = 0;
371 dhack->dccph_ack_nr_high = htons(gsr >> 32);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700372 dhack->dccph_ack_nr_low = htonl(gsr & 0xffffffff);
373}
374
375static inline void dccp_update_gsr(struct sock *sk, u64 seq)
376{
377 struct dccp_sock *dp = dccp_sk(sk);
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800378 const struct dccp_minisock *dmsk = dccp_msk(sk);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700379
Arnaldo Carvalho de Melo03ace392005-08-21 05:36:45 -0300380 dp->dccps_gsr = seq;
381 dccp_set_seqno(&dp->dccps_swl,
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800382 dp->dccps_gsr + 1 - (dmsk->dccpms_sequence_window / 4));
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700383 dccp_set_seqno(&dp->dccps_swh,
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800384 dp->dccps_gsr + (3 * dmsk->dccpms_sequence_window) / 4);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700385}
386
387static inline void dccp_update_gss(struct sock *sk, u64 seq)
388{
389 struct dccp_sock *dp = dccp_sk(sk);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700390
Arnaldo Carvalho de Melo03ace392005-08-21 05:36:45 -0300391 dp->dccps_awh = dp->dccps_gss = seq;
392 dccp_set_seqno(&dp->dccps_awl,
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -0300393 (dp->dccps_gss -
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800394 dccp_msk(sk)->dccpms_sequence_window + 1));
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700395}
YOSHIFUJI Hideakic9eaf172007-02-09 23:24:38 +0900396
Arnaldo Carvalho de Meloae31c332005-09-18 00:17:51 -0700397static inline int dccp_ack_pending(const struct sock *sk)
398{
399 const struct dccp_sock *dp = dccp_sk(sk);
400 return dp->dccps_timestamp_echo != 0 ||
401#ifdef CONFIG_IP_DCCP_ACKVEC
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800402 (dccp_msk(sk)->dccpms_send_ack_vector &&
Arnaldo Carvalho de Meloae31c332005-09-18 00:17:51 -0700403 dccp_ackvec_pending(dp->dccps_hc_rx_ackvec)) ||
404#endif
405 inet_csk_ack_scheduled(sk);
406}
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700407
Arnaldo Carvalho de Melo2d0817d2006-03-20 22:32:06 -0800408extern int dccp_insert_options(struct sock *sk, struct sk_buff *skb);
409extern int dccp_insert_option_elapsed_time(struct sock *sk,
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700410 struct sk_buff *skb,
411 u32 elapsed_time);
Gerrit Renker4c70f382007-09-25 22:40:13 -0700412extern u32 dccp_timestamp(void);
413extern void dccp_timestamping_init(void);
Arnaldo Carvalho de Melo2d0817d2006-03-20 22:32:06 -0800414extern int dccp_insert_option_timestamp(struct sock *sk,
Arnaldo Carvalho de Melod4b81ff2005-08-23 21:51:36 -0700415 struct sk_buff *skb);
Arnaldo Carvalho de Melo2d0817d2006-03-20 22:32:06 -0800416extern int dccp_insert_option(struct sock *sk, struct sk_buff *skb,
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700417 unsigned char option,
418 const void *value, unsigned char len);
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 */