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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, \
Harvey Harrison0dc47872008-03-05 20:47:47 -080026 __func__, ##a)
Gerrit Renker59348b12006-11-20 18:39:23 -020027#define DCCP_CRIT(fmt, a...) printk(KERN_CRIT fmt " at %s:%d/%s()\n", ##a, \
Harvey Harrison0dc47872008-03-05 20:47:47 -080028 __FILE__, __LINE__, __func__)
Gerrit Renker59348b12006-11-20 18:39:23 -020029#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 \
Harvey Harrison0dc47872008-03-05 20:47:47 -080039 "%s: " fmt, __func__, ##a)
Gerrit Renker84116712006-11-20 18:26:03 -020040
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)
Gerrit Renkerf3f3abb2009-01-16 23:36:33 +000045#define dccp_debug(fmt, a...) dccp_pr_debug_cat(KERN_DEBUG fmt, ##a)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070046#else
47#define dccp_pr_debug(format, a...)
48#define dccp_pr_debug_cat(format, a...)
Gerrit Renkerf3f3abb2009-01-16 23:36:33 +000049#define dccp_debug(format, a...)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070050#endif
51
52extern struct inet_hashinfo dccp_hashinfo;
53
Eric Dumazetdd24c002008-11-25 21:17:14 -080054extern struct percpu_counter dccp_orphan_count;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070055
56extern void dccp_time_wait(struct sock *sk, int state, int timeo);
57
Gerrit Renker60361be2006-11-10 02:13:56 -020058/*
59 * Set safe upper bounds for header and option length. Since Data Offset is 8
60 * bits (RFC 4340, sec. 5.1), the total header length can never be more than
61 * 4 * 255 = 1020 bytes. The largest possible header length is 28 bytes (X=1):
62 * - DCCP-Response with ACK Subheader and 4 bytes of Service code OR
63 * - DCCP-Reset with ACK Subheader and 4 bytes of Reset Code fields
64 * Hence a safe upper bound for the maximum option length is 1020-28 = 992
65 */
Gerrit Renker86739fb2009-02-27 22:38:29 +000066#define MAX_DCCP_SPECIFIC_HEADER (255 * sizeof(uint32_t))
Gerrit Renker60361be2006-11-10 02:13:56 -020067#define DCCP_MAX_PACKET_HDR 28
68#define DCCP_MAX_OPT_LEN (MAX_DCCP_SPECIFIC_HEADER - DCCP_MAX_PACKET_HDR)
69#define MAX_DCCP_HEADER (MAX_DCCP_SPECIFIC_HEADER + MAX_HEADER)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070070
Gerrit Renker86739fb2009-02-27 22:38:29 +000071/* Upper bound for initial feature-negotiation overhead (padded to 32 bits) */
72#define DCCP_FEATNEG_OVERHEAD (32 * sizeof(uint32_t))
73
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070074#define DCCP_TIMEWAIT_LEN (60 * HZ) /* how long to wait to destroy TIME-WAIT
75 * state, about 60 seconds */
76
Gerrit Renker0e64e942006-10-24 16:17:51 -070077/* RFC 1122, 4.2.3.1 initial RTO value */
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070078#define DCCP_TIMEOUT_INIT ((unsigned)(3 * HZ))
79
Gerrit Renker28be5442007-12-13 12:16:23 -020080/*
81 * The maximum back-off value for retransmissions. This is needed for
82 * - retransmitting client-Requests (sec. 8.1.1),
83 * - retransmitting Close/CloseReq when closing (sec. 8.3),
84 * - feature-negotiation retransmission (sec. 6.6.3),
85 * - Acks in client-PARTOPEN state (sec. 8.1.5).
86 */
87#define DCCP_RTO_MAX ((unsigned)(64 * HZ))
Gerrit Renker4712a792007-03-20 15:23:18 -030088
Gerrit Renker954c2db2007-12-12 14:06:14 -020089/*
90 * RTT sampling: sanity bounds and fallback RTT value from RFC 4340, section 3.4
91 */
Gerrit Renker4712a792007-03-20 15:23:18 -030092#define DCCP_SANE_RTT_MIN 100
Gerrit Renker954c2db2007-12-12 14:06:14 -020093#define DCCP_FALLBACK_RTT (USEC_PER_SEC / 5)
94#define DCCP_SANE_RTT_MAX (3 * USEC_PER_SEC)
Gerrit Renker4712a792007-03-20 15:23:18 -030095
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070096/* Maximal interval between probes for local resources. */
97#define DCCP_RESOURCE_PROBE_INTERVAL ((unsigned)(HZ / 2U))
98
Gerrit Renker2e2e9e92006-11-13 13:23:52 -020099/* sysctl variables for DCCP */
100extern int sysctl_dccp_request_retries;
101extern int sysctl_dccp_retries1;
102extern int sysctl_dccp_retries2;
Ian McDonaldb1308dc2006-11-20 18:30:17 -0200103extern int sysctl_dccp_tx_qlen;
Gerrit Renkera94f0f92007-09-26 11:31:49 -0300104extern int sysctl_dccp_sync_ratelimit;
Gerrit Renker2e2e9e92006-11-13 13:23:52 -0200105
Gerrit Renker6b811d42007-03-20 12:26:51 -0300106/*
107 * 48-bit sequence number arithmetic (signed and unsigned)
108 */
109#define INT48_MIN 0x800000000000LL /* 2^47 */
110#define UINT48_MAX 0xFFFFFFFFFFFFLL /* 2^48 - 1 */
111#define COMPLEMENT48(x) (0x1000000000000LL - (x)) /* 2^48 - x */
112#define TO_SIGNED48(x) (((x) < INT48_MIN)? (x) : -COMPLEMENT48( (x)))
113#define TO_UNSIGNED48(x) (((x) >= 0)? (x) : COMPLEMENT48(-(x)))
114#define ADD48(a, b) (((a) + (b)) & UINT48_MAX)
115#define SUB48(a, b) ADD48((a), COMPLEMENT48(b))
116
117static inline void dccp_set_seqno(u64 *seqno, u64 value)
118{
119 *seqno = value & UINT48_MAX;
120}
121
122static inline void dccp_inc_seqno(u64 *seqno)
123{
124 *seqno = ADD48(*seqno, 1);
125}
126
Gerrit Renker0aec51c2007-03-20 12:45:59 -0300127/* signed mod-2^48 distance: pos. if seqno1 < seqno2, neg. if seqno1 > seqno2 */
128static inline s64 dccp_delta_seqno(const u64 seqno1, const u64 seqno2)
Gerrit Renker6b811d42007-03-20 12:26:51 -0300129{
Gerrit Renker0aec51c2007-03-20 12:45:59 -0300130 u64 delta = SUB48(seqno2, seqno1);
131
132 return TO_SIGNED48(delta);
Gerrit Renker6b811d42007-03-20 12:26:51 -0300133}
134
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700135/* is seq1 < seq2 ? */
Patrick McHardya10cedd2005-08-14 21:05:53 -0300136static inline int before48(const u64 seq1, const u64 seq2)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700137{
Gerrit Renkerd52de172007-03-20 13:00:26 -0300138 return (s64)((seq2 << 16) - (seq1 << 16)) > 0;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700139}
140
141/* is seq1 > seq2 ? */
Gerrit Renkerd52de172007-03-20 13:00:26 -0300142#define after48(seq1, seq2) before48(seq2, seq1)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700143
144/* is seq2 <= seq1 <= seq3 ? */
Patrick McHardya10cedd2005-08-14 21:05:53 -0300145static inline int between48(const u64 seq1, const u64 seq2, const u64 seq3)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700146{
147 return (seq3 << 16) - (seq2 << 16) >= (seq1 << 16) - (seq2 << 16);
148}
149
150static inline u64 max48(const u64 seq1, const u64 seq2)
151{
152 return after48(seq1, seq2) ? seq1 : seq2;
153}
154
Gerrit Renker2013c7e2008-07-13 11:51:40 +0100155/**
156 * dccp_loss_free - Evaluates condition for data loss from RFC 4340, 7.7.1
157 * @s1: start sequence number
158 * @s2: end sequence number
159 * @ndp: NDP count on packet with sequence number @s2
160 * Returns true if the sequence range s1...s2 has no data loss.
161 */
162static inline bool dccp_loss_free(const u64 s1, const u64 s2, const u64 ndp)
163{
164 s64 delta = dccp_delta_seqno(s1, s2);
165
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700166 WARN_ON(delta < 0);
Gerrit Renker2013c7e2008-07-13 11:51:40 +0100167 return (u64)delta <= ndp + 1;
168}
169
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700170enum {
171 DCCP_MIB_NUM = 0,
172 DCCP_MIB_ACTIVEOPENS, /* ActiveOpens */
173 DCCP_MIB_ESTABRESETS, /* EstabResets */
174 DCCP_MIB_CURRESTAB, /* CurrEstab */
YOSHIFUJI Hideakic9eaf172007-02-09 23:24:38 +0900175 DCCP_MIB_OUTSEGS, /* OutSegs */
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700176 DCCP_MIB_OUTRSTS,
177 DCCP_MIB_ABORTONTIMEOUT,
178 DCCP_MIB_TIMEOUTS,
179 DCCP_MIB_ABORTFAILED,
180 DCCP_MIB_PASSIVEOPENS,
181 DCCP_MIB_ATTEMPTFAILS,
182 DCCP_MIB_OUTDATAGRAMS,
183 DCCP_MIB_INERRS,
184 DCCP_MIB_OPTMANDATORYERROR,
185 DCCP_MIB_INVALIDOPT,
186 __DCCP_MIB_MAX
187};
188
189#define DCCP_MIB_MAX __DCCP_MIB_MAX
190struct dccp_mib {
191 unsigned long mibs[DCCP_MIB_MAX];
Eric Dumazetec733b152010-03-18 20:36:06 +0000192};
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700193
194DECLARE_SNMP_STAT(struct dccp_mib, dccp_statistics);
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -0300195#define DCCP_INC_STATS(field) SNMP_INC_STATS(dccp_statistics, field)
196#define DCCP_INC_STATS_BH(field) SNMP_INC_STATS_BH(dccp_statistics, field)
197#define DCCP_INC_STATS_USER(field) SNMP_INC_STATS_USER(dccp_statistics, field)
198#define DCCP_DEC_STATS(field) SNMP_DEC_STATS(dccp_statistics, field)
199#define DCCP_ADD_STATS_BH(field, val) \
200 SNMP_ADD_STATS_BH(dccp_statistics, field, val)
201#define DCCP_ADD_STATS_USER(field, val) \
202 SNMP_ADD_STATS_USER(dccp_statistics, field, val)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700203
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200204/*
205 * Checksumming routines
206 */
Ian McDonalde9618112007-05-28 16:32:26 -0300207static inline unsigned int dccp_csum_coverage(const struct sk_buff *skb)
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200208{
209 const struct dccp_hdr* dh = dccp_hdr(skb);
210
211 if (dh->dccph_cscov == 0)
212 return skb->len;
213 return (dh->dccph_doff + dh->dccph_cscov - 1) * sizeof(u32);
214}
215
216static inline void dccp_csum_outgoing(struct sk_buff *skb)
217{
Ian McDonalde9618112007-05-28 16:32:26 -0300218 unsigned int cov = dccp_csum_coverage(skb);
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200219
220 if (cov >= skb->len)
221 dccp_hdr(skb)->dccph_cscov = 0;
222
223 skb->csum = skb_checksum(skb, 0, (cov > skb->len)? skb->len : cov, 0);
224}
225
Herbert Xubb296242010-04-11 02:15:55 +0000226extern void dccp_v4_send_check(struct sock *sk, struct sk_buff *skb);
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200227
Gerrit Renker59435442008-07-26 11:59:09 +0100228extern int dccp_retransmit_skb(struct sock *sk);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700229
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700230extern void dccp_send_ack(struct sock *sk);
Gui Jianfeng6edafaa2008-08-06 23:50:04 -0700231extern void dccp_reqsk_send_ack(struct sock *sk, struct sk_buff *skb,
232 struct request_sock *rsk);
Gerrit Renker8a73cd02006-11-10 12:32:01 -0200233
Arnaldo Carvalho de Meloe92ae932005-08-17 03:10:59 -0300234extern void dccp_send_sync(struct sock *sk, const u64 seq,
235 const enum dccp_pkt_type pkt_type);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700236
Ian McDonald97e58482006-08-26 19:16:45 -0700237extern void dccp_write_xmit(struct sock *sk, int block);
Arnaldo Carvalho de Meloc530cfb2005-08-29 02:15:54 -0300238extern void dccp_write_space(struct sock *sk);
Arnaldo Carvalho de Melo27258ee2005-08-09 20:30:56 -0700239
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700240extern void dccp_init_xmit_timers(struct sock *sk);
241static inline void dccp_clear_xmit_timers(struct sock *sk)
242{
243 inet_csk_clear_xmit_timers(sk);
244}
245
246extern unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu);
247
248extern const char *dccp_packet_name(const int type);
249extern const char *dccp_state_name(const int state);
250
Arnaldo Carvalho de Meloc25a18b2006-03-20 21:58:56 -0800251extern void dccp_set_state(struct sock *sk, const int state);
252extern void dccp_done(struct sock *sk);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700253
Gerrit Renkerac757732008-11-04 23:55:49 -0800254extern int dccp_reqsk_init(struct request_sock *rq, struct dccp_sock const *dp,
255 struct sk_buff const *skb);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700256
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700257extern int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb);
258
259extern struct sock *dccp_create_openreq_child(struct sock *sk,
260 const struct request_sock *req,
261 const struct sk_buff *skb);
262
263extern int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb);
264
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700265extern struct sock *dccp_v4_request_recv_sock(struct sock *sk,
266 struct sk_buff *skb,
267 struct request_sock *req,
268 struct dst_entry *dst);
269extern struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb,
270 struct request_sock *req,
271 struct request_sock **prev);
272
273extern int dccp_child_process(struct sock *parent, struct sock *child,
274 struct sk_buff *skb);
275extern int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
276 struct dccp_hdr *dh, unsigned len);
277extern int dccp_rcv_established(struct sock *sk, struct sk_buff *skb,
278 const struct dccp_hdr *dh, const unsigned len);
279
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -0800280extern int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized);
Brian Haley7d06b2e2008-06-14 17:04:49 -0700281extern void dccp_destroy_sock(struct sock *sk);
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800282
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700283extern void dccp_close(struct sock *sk, long timeout);
284extern struct sk_buff *dccp_make_response(struct sock *sk,
285 struct dst_entry *dst,
286 struct request_sock *req);
287
288extern int dccp_connect(struct sock *sk);
289extern int dccp_disconnect(struct sock *sk, int flags);
290extern int dccp_getsockopt(struct sock *sk, int level, int optname,
Arnaldo Carvalho de Meloa1d3a352005-08-13 22:42:25 -0300291 char __user *optval, int __user *optlen);
292extern int dccp_setsockopt(struct sock *sk, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -0700293 char __user *optval, unsigned int optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800294#ifdef CONFIG_COMPAT
295extern int compat_dccp_getsockopt(struct sock *sk,
296 int level, int optname,
297 char __user *optval, int __user *optlen);
298extern int compat_dccp_setsockopt(struct sock *sk,
299 int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -0700300 char __user *optval, unsigned int optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800301#endif
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700302extern int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg);
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -0300303extern int dccp_sendmsg(struct kiocb *iocb, struct sock *sk,
304 struct msghdr *msg, size_t size);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700305extern int dccp_recvmsg(struct kiocb *iocb, struct sock *sk,
306 struct msghdr *msg, size_t len, int nonblock,
307 int flags, int *addr_len);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700308extern void dccp_shutdown(struct sock *sk, int how);
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800309extern int inet_dccp_listen(struct socket *sock, int backlog);
310extern unsigned int dccp_poll(struct file *file, struct socket *sock,
311 poll_table *wait);
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800312extern int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr,
313 int addr_len);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700314
Denis V. Lunev7630f022008-04-03 14:20:52 -0700315extern struct sk_buff *dccp_ctl_make_reset(struct sock *sk,
Gerrit Renkere356d372007-09-26 14:35:19 -0300316 struct sk_buff *skb);
Arnaldo Carvalho de Melo017487d2006-03-20 19:25:24 -0800317extern int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code);
Arnaldo Carvalho de Melo7ad07e72005-08-23 21:50:06 -0700318extern void dccp_send_close(struct sock *sk, const int active);
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800319extern int dccp_invalid_packet(struct sk_buff *skb);
Gerrit Renker3393da82007-09-25 22:40:44 -0700320extern u32 dccp_sample_rtt(struct sock *sk, long delta);
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800321
322static inline int dccp_bad_service_code(const struct sock *sk,
Andrea Bittau60fe62e2006-03-20 19:23:32 -0800323 const __be32 service)
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800324{
325 const struct dccp_sock *dp = dccp_sk(sk);
326
327 if (dp->dccps_service == service)
328 return 0;
329 return !dccp_list_has_service(dp->dccps_service_list, service);
330}
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700331
Gerrit Renker0430ee32007-09-26 11:27:56 -0300332/**
333 * dccp_skb_cb - DCCP per-packet control information
334 * @dccpd_type: one of %dccp_pkt_type (or unknown)
335 * @dccpd_ccval: CCVal field (5.1), see e.g. RFC 4342, 8.1
336 * @dccpd_reset_code: one of %dccp_reset_codes
337 * @dccpd_reset_data: Data1..3 fields (depend on @dccpd_reset_code)
338 * @dccpd_opt_len: total length of all options (5.8) in the packet
339 * @dccpd_seq: sequence number
340 * @dccpd_ack_seq: acknowledgment number subheader field value
341 * This is used for transmission as well as for reception.
342 */
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700343struct dccp_skb_cb {
Patrick McHardy028b0272008-04-12 18:35:41 -0700344 union {
345 struct inet_skb_parm h4;
346#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
347 struct inet6_skb_parm h6;
348#endif
349 } header;
Arnaldo Carvalho de Melo67e6b622005-09-16 16:58:40 -0700350 __u8 dccpd_type:4;
351 __u8 dccpd_ccval:4;
Gerrit Renker0430ee32007-09-26 11:27:56 -0300352 __u8 dccpd_reset_code,
353 dccpd_reset_data[3];
Arnaldo Carvalho de Melo67e6b622005-09-16 16:58:40 -0700354 __u16 dccpd_opt_len;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700355 __u64 dccpd_seq;
356 __u64 dccpd_ack_seq;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700357};
358
359#define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0]))
360
Gerrit Renker2180c412007-12-06 12:27:15 -0200361/* RFC 4340, sec. 7.7 */
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700362static inline int dccp_non_data_packet(const struct sk_buff *skb)
363{
364 const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
365
366 return type == DCCP_PKT_ACK ||
367 type == DCCP_PKT_CLOSE ||
368 type == DCCP_PKT_CLOSEREQ ||
369 type == DCCP_PKT_RESET ||
370 type == DCCP_PKT_SYNC ||
371 type == DCCP_PKT_SYNCACK;
372}
373
Gerrit Renker2180c412007-12-06 12:27:15 -0200374/* RFC 4340, sec. 7.7 */
375static inline int dccp_data_packet(const struct sk_buff *skb)
376{
377 const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
378
379 return type == DCCP_PKT_DATA ||
380 type == DCCP_PKT_DATAACK ||
381 type == DCCP_PKT_REQUEST ||
382 type == DCCP_PKT_RESPONSE;
383}
384
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700385static inline int dccp_packet_without_ack(const struct sk_buff *skb)
386{
387 const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
388
389 return type == DCCP_PKT_DATA || type == DCCP_PKT_REQUEST;
390}
391
Gerrit Renker6b811d42007-03-20 12:26:51 -0300392#define DCCP_PKT_WITHOUT_ACK_SEQ (UINT48_MAX << 2)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700393
394static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss)
395{
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -0300396 struct dccp_hdr_ext *dhx = (struct dccp_hdr_ext *)((void *)dh +
397 sizeof(*dh));
Andrea Bittau60fe62e2006-03-20 19:23:32 -0800398 dh->dccph_seq2 = 0;
399 dh->dccph_seq = htons((gss >> 32) & 0xfffff);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700400 dhx->dccph_seq_low = htonl(gss & 0xffffffff);
401}
402
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -0300403static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack,
404 const u64 gsr)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700405{
Andrea Bittau60fe62e2006-03-20 19:23:32 -0800406 dhack->dccph_reserved1 = 0;
407 dhack->dccph_ack_nr_high = htons(gsr >> 32);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700408 dhack->dccph_ack_nr_low = htonl(gsr & 0xffffffff);
409}
410
411static inline void dccp_update_gsr(struct sock *sk, u64 seq)
412{
413 struct dccp_sock *dp = dccp_sk(sk);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700414
Arnaldo Carvalho de Melo03ace392005-08-21 05:36:45 -0300415 dp->dccps_gsr = seq;
Gerrit Renker792b4872009-01-16 23:36:31 +0000416 /* Sequence validity window depends on remote Sequence Window (7.5.1) */
417 dp->dccps_swl = SUB48(ADD48(dp->dccps_gsr, 1), dp->dccps_r_seq_win / 4);
418 dp->dccps_swh = ADD48(dp->dccps_gsr, (3 * dp->dccps_r_seq_win) / 4);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700419}
420
421static inline void dccp_update_gss(struct sock *sk, u64 seq)
422{
423 struct dccp_sock *dp = dccp_sk(sk);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700424
Gerrit Renker792b4872009-01-16 23:36:31 +0000425 dp->dccps_gss = seq;
426 /* Ack validity window depends on local Sequence Window value (7.5.1) */
427 dp->dccps_awl = SUB48(ADD48(dp->dccps_gss, 1), dp->dccps_l_seq_win);
428 dp->dccps_awh = dp->dccps_gss;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700429}
YOSHIFUJI Hideakic9eaf172007-02-09 23:24:38 +0900430
Arnaldo Carvalho de Meloae31c332005-09-18 00:17:51 -0700431static inline int dccp_ack_pending(const struct sock *sk)
432{
433 const struct dccp_sock *dp = dccp_sk(sk);
434 return dp->dccps_timestamp_echo != 0 ||
Gerrit Renker6fdd34d2008-12-08 01:19:06 -0800435 (dp->dccps_hc_rx_ackvec != NULL &&
Arnaldo Carvalho de Meloae31c332005-09-18 00:17:51 -0700436 dccp_ackvec_pending(dp->dccps_hc_rx_ackvec)) ||
Arnaldo Carvalho de Meloae31c332005-09-18 00:17:51 -0700437 inet_csk_ack_scheduled(sk);
438}
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700439
Gerrit Renker9eca0a42008-11-12 00:48:44 -0800440extern int dccp_feat_finalise_settings(struct dccp_sock *dp);
Gerrit Renker0c116832008-11-16 22:49:52 -0800441extern int dccp_feat_server_ccid_dependencies(struct dccp_request_sock *dreq);
Gerrit Renker0971d172008-12-01 23:27:31 -0800442extern int dccp_feat_insert_opts(struct dccp_sock*, struct dccp_request_sock*,
443 struct sk_buff *skb);
Gerrit Renker422d9cd2008-12-01 23:34:01 -0800444extern int dccp_feat_activate_values(struct sock *sk, struct list_head *fn);
Gerrit Renker61e64732008-11-04 23:54:04 -0800445extern void dccp_feat_list_purge(struct list_head *fn_list);
446
Arnaldo Carvalho de Melo2d0817d2006-03-20 22:32:06 -0800447extern int dccp_insert_options(struct sock *sk, struct sk_buff *skb);
Gerrit Renkeraf3b8672007-12-13 12:38:11 -0200448extern int dccp_insert_options_rsk(struct dccp_request_sock*, struct sk_buff*);
Gerrit Renkera7d13fb2010-06-22 01:14:34 +0000449extern int dccp_insert_option_elapsed_time(struct sk_buff *skb, u32 elapsed);
Gerrit Renker4c70f382007-09-25 22:40:13 -0700450extern u32 dccp_timestamp(void);
451extern void dccp_timestamping_init(void);
Gerrit Renkera7d13fb2010-06-22 01:14:34 +0000452extern int dccp_insert_option_timestamp(struct sk_buff *skb);
453extern int dccp_insert_option(struct sk_buff *skb, unsigned char option,
454 const void *value, unsigned char len);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700455
Arnaldo Carvalho de Meloe55d9122006-03-20 19:25:02 -0800456#ifdef CONFIG_SYSCTL
457extern int dccp_sysctl_init(void);
458extern void dccp_sysctl_exit(void);
459#else
460static inline int dccp_sysctl_init(void)
461{
462 return 0;
463}
464
465static inline void dccp_sysctl_exit(void)
466{
467}
468#endif
469
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700470#endif /* _DCCP_H */