2005-08-09 20:14:34 -07:00
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#ifndef _DCCP_H
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#define _DCCP_H
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/*
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* net/dccp/dccp.h
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*
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* An implementation of the DCCP protocol
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2005-08-19 20:23:43 -07:00
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* Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
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2006-08-26 19:01:30 -07:00
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* Copyright (c) 2005-6 Ian McDonald <ian.mcdonald@jandi.co.nz>
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2005-08-09 20:14:34 -07:00
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/dccp.h>
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#include <net/snmp.h>
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#include <net/sock.h>
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#include <net/tcp.h>
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2005-09-18 00:17:51 -07:00
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#include "ackvec.h"
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2005-08-09 20:14:34 -07:00
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2005-08-13 16:35:39 -07:00
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#ifdef CONFIG_IP_DCCP_DEBUG
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2005-08-09 20:14:34 -07:00
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extern int dccp_debug;
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#define dccp_pr_debug(format, a...) \
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do { if (dccp_debug) \
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printk(KERN_DEBUG "%s: " format, __FUNCTION__ , ##a); \
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} while (0)
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2005-08-13 16:34:54 -07:00
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#define dccp_pr_debug_cat(format, a...) do { if (dccp_debug) \
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printk(format, ##a); } while (0)
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2005-08-09 20:14:34 -07:00
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#else
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#define dccp_pr_debug(format, a...)
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#define dccp_pr_debug_cat(format, a...)
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#endif
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extern struct inet_hashinfo dccp_hashinfo;
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extern atomic_t dccp_orphan_count;
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extern void dccp_time_wait(struct sock *sk, int state, int timeo);
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2006-11-09 21:13:56 -07:00
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/*
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* Set safe upper bounds for header and option length. Since Data Offset is 8
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* bits (RFC 4340, sec. 5.1), the total header length can never be more than
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* 4 * 255 = 1020 bytes. The largest possible header length is 28 bytes (X=1):
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* - DCCP-Response with ACK Subheader and 4 bytes of Service code OR
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* - DCCP-Reset with ACK Subheader and 4 bytes of Reset Code fields
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* Hence a safe upper bound for the maximum option length is 1020-28 = 992
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*/
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#define MAX_DCCP_SPECIFIC_HEADER (255 * sizeof(int))
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#define DCCP_MAX_PACKET_HDR 28
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#define DCCP_MAX_OPT_LEN (MAX_DCCP_SPECIFIC_HEADER - DCCP_MAX_PACKET_HDR)
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#define MAX_DCCP_HEADER (MAX_DCCP_SPECIFIC_HEADER + MAX_HEADER)
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2005-08-09 20:14:34 -07:00
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#define DCCP_TIMEWAIT_LEN (60 * HZ) /* how long to wait to destroy TIME-WAIT
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* state, about 60 seconds */
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2006-10-24 16:17:51 -07:00
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/* RFC 1122, 4.2.3.1 initial RTO value */
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2005-08-09 20:14:34 -07:00
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#define DCCP_TIMEOUT_INIT ((unsigned)(3 * HZ))
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/* Maximal interval between probes for local resources. */
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#define DCCP_RESOURCE_PROBE_INTERVAL ((unsigned)(HZ / 2U))
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#define DCCP_RTO_MAX ((unsigned)(120 * HZ)) /* FIXME: using TCP value */
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2006-11-10 08:09:10 -07:00
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#define DCCP_XMIT_TIMEO 30000 /* Time/msecs for blocking transmit per packet */
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2006-11-13 08:23:52 -07:00
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/* sysctl variables for DCCP */
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extern int sysctl_dccp_request_retries;
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extern int sysctl_dccp_retries1;
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extern int sysctl_dccp_retries2;
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2006-11-13 08:25:41 -07:00
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extern int sysctl_dccp_feat_sequence_window;
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extern int sysctl_dccp_feat_rx_ccid;
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extern int sysctl_dccp_feat_tx_ccid;
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extern int sysctl_dccp_feat_ack_ratio;
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extern int sysctl_dccp_feat_send_ack_vector;
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extern int sysctl_dccp_feat_send_ndp_count;
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2006-11-13 08:23:52 -07:00
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2005-08-09 20:14:34 -07:00
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/* is seq1 < seq2 ? */
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2005-08-14 17:05:53 -07:00
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static inline int before48(const u64 seq1, const u64 seq2)
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2005-08-09 20:14:34 -07:00
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{
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2005-08-14 17:05:53 -07:00
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return (s64)((seq1 << 16) - (seq2 << 16)) < 0;
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2005-08-09 20:14:34 -07:00
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}
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/* is seq1 > seq2 ? */
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2005-08-14 17:05:53 -07:00
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static inline int after48(const u64 seq1, const u64 seq2)
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2005-08-09 20:14:34 -07:00
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{
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2005-08-14 17:05:53 -07:00
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return (s64)((seq2 << 16) - (seq1 << 16)) < 0;
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2005-08-09 20:14:34 -07:00
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}
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/* is seq2 <= seq1 <= seq3 ? */
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2005-08-14 17:05:53 -07:00
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static inline int between48(const u64 seq1, const u64 seq2, const u64 seq3)
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2005-08-09 20:14:34 -07:00
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{
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return (seq3 << 16) - (seq2 << 16) >= (seq1 << 16) - (seq2 << 16);
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}
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static inline u64 max48(const u64 seq1, const u64 seq2)
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{
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return after48(seq1, seq2) ? seq1 : seq2;
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}
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2006-08-26 19:06:42 -07:00
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/* is seq1 next seqno after seq2 */
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static inline int follows48(const u64 seq1, const u64 seq2)
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{
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int diff = (seq1 & 0xFFFF) - (seq2 & 0xFFFF);
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return diff==1;
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}
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2005-08-09 20:14:34 -07:00
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enum {
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DCCP_MIB_NUM = 0,
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DCCP_MIB_ACTIVEOPENS, /* ActiveOpens */
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DCCP_MIB_ESTABRESETS, /* EstabResets */
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DCCP_MIB_CURRESTAB, /* CurrEstab */
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DCCP_MIB_OUTSEGS, /* OutSegs */
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DCCP_MIB_OUTRSTS,
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DCCP_MIB_ABORTONTIMEOUT,
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DCCP_MIB_TIMEOUTS,
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DCCP_MIB_ABORTFAILED,
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DCCP_MIB_PASSIVEOPENS,
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DCCP_MIB_ATTEMPTFAILS,
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DCCP_MIB_OUTDATAGRAMS,
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DCCP_MIB_INERRS,
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DCCP_MIB_OPTMANDATORYERROR,
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DCCP_MIB_INVALIDOPT,
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__DCCP_MIB_MAX
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};
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#define DCCP_MIB_MAX __DCCP_MIB_MAX
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struct dccp_mib {
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unsigned long mibs[DCCP_MIB_MAX];
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} __SNMP_MIB_ALIGN__;
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DECLARE_SNMP_STAT(struct dccp_mib, dccp_statistics);
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2005-08-13 16:34:54 -07:00
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#define DCCP_INC_STATS(field) SNMP_INC_STATS(dccp_statistics, field)
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#define DCCP_INC_STATS_BH(field) SNMP_INC_STATS_BH(dccp_statistics, field)
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#define DCCP_INC_STATS_USER(field) SNMP_INC_STATS_USER(dccp_statistics, field)
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#define DCCP_DEC_STATS(field) SNMP_DEC_STATS(dccp_statistics, field)
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#define DCCP_ADD_STATS_BH(field, val) \
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SNMP_ADD_STATS_BH(dccp_statistics, field, val)
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#define DCCP_ADD_STATS_USER(field, val) \
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SNMP_ADD_STATS_USER(dccp_statistics, field, val)
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2005-08-09 20:14:34 -07:00
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2006-11-10 12:43:06 -07:00
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/*
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* Checksumming routines
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*/
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static inline int dccp_csum_coverage(const struct sk_buff *skb)
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{
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const struct dccp_hdr* dh = dccp_hdr(skb);
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if (dh->dccph_cscov == 0)
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return skb->len;
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return (dh->dccph_doff + dh->dccph_cscov - 1) * sizeof(u32);
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}
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static inline void dccp_csum_outgoing(struct sk_buff *skb)
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{
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int cov = dccp_csum_coverage(skb);
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if (cov >= skb->len)
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dccp_hdr(skb)->dccph_cscov = 0;
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skb->csum = skb_checksum(skb, 0, (cov > skb->len)? skb->len : cov, 0);
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}
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extern void dccp_v4_send_check(struct sock *sk, int len, struct sk_buff *skb);
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2005-08-09 20:14:34 -07:00
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extern int dccp_retransmit_skb(struct sock *sk, struct sk_buff *skb);
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extern void dccp_send_ack(struct sock *sk);
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extern void dccp_send_delayed_ack(struct sock *sk);
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2006-11-10 07:32:01 -07:00
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extern void dccp_reqsk_send_ack(struct sk_buff *sk, struct request_sock *rsk);
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2005-08-16 23:10:59 -07:00
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extern void dccp_send_sync(struct sock *sk, const u64 seq,
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const enum dccp_pkt_type pkt_type);
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2005-08-09 20:14:34 -07:00
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2006-08-26 19:16:45 -07:00
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extern void dccp_write_xmit(struct sock *sk, int block);
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2005-08-28 22:15:54 -07:00
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extern void dccp_write_space(struct sock *sk);
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2005-08-09 20:30:56 -07:00
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2005-08-09 20:14:34 -07:00
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extern void dccp_init_xmit_timers(struct sock *sk);
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static inline void dccp_clear_xmit_timers(struct sock *sk)
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{
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inet_csk_clear_xmit_timers(sk);
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}
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extern unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu);
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extern const char *dccp_packet_name(const int type);
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extern const char *dccp_state_name(const int state);
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2006-03-20 22:58:56 -07:00
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extern void dccp_set_state(struct sock *sk, const int state);
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extern void dccp_done(struct sock *sk);
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2005-08-09 20:14:34 -07:00
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2006-11-10 11:08:37 -07:00
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extern void dccp_reqsk_init(struct request_sock *req, struct sk_buff *skb);
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2005-08-09 20:14:34 -07:00
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extern int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb);
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extern struct sock *dccp_create_openreq_child(struct sock *sk,
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const struct request_sock *req,
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const struct sk_buff *skb);
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extern int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb);
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extern struct sock *dccp_v4_request_recv_sock(struct sock *sk,
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struct sk_buff *skb,
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struct request_sock *req,
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struct dst_entry *dst);
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extern struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb,
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struct request_sock *req,
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struct request_sock **prev);
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extern int dccp_child_process(struct sock *parent, struct sock *child,
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struct sk_buff *skb);
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extern int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
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struct dccp_hdr *dh, unsigned len);
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extern int dccp_rcv_established(struct sock *sk, struct sk_buff *skb,
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const struct dccp_hdr *dh, const unsigned len);
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2006-03-20 23:00:37 -07:00
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extern int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized);
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2006-03-20 22:23:15 -07:00
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extern int dccp_destroy_sock(struct sock *sk);
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2005-12-14 00:24:16 -07:00
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2005-08-09 20:14:34 -07:00
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extern void dccp_close(struct sock *sk, long timeout);
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extern struct sk_buff *dccp_make_response(struct sock *sk,
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struct dst_entry *dst,
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struct request_sock *req);
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extern int dccp_connect(struct sock *sk);
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extern int dccp_disconnect(struct sock *sk, int flags);
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2006-03-20 22:23:39 -07:00
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extern void dccp_hash(struct sock *sk);
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2005-12-14 00:24:16 -07:00
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extern void dccp_unhash(struct sock *sk);
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2005-08-09 20:14:34 -07:00
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extern int dccp_getsockopt(struct sock *sk, int level, int optname,
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2005-08-13 18:42:25 -07:00
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char __user *optval, int __user *optlen);
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extern int dccp_setsockopt(struct sock *sk, int level, int optname,
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char __user *optval, int optlen);
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2006-03-20 23:45:21 -07:00
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#ifdef CONFIG_COMPAT
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extern int compat_dccp_getsockopt(struct sock *sk,
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int level, int optname,
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char __user *optval, int __user *optlen);
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extern int compat_dccp_setsockopt(struct sock *sk,
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int level, int optname,
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char __user *optval, int optlen);
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#endif
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2005-08-09 20:14:34 -07:00
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extern int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg);
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2005-08-13 16:34:54 -07:00
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extern int dccp_sendmsg(struct kiocb *iocb, struct sock *sk,
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struct msghdr *msg, size_t size);
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2005-08-09 20:14:34 -07:00
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extern int dccp_recvmsg(struct kiocb *iocb, struct sock *sk,
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struct msghdr *msg, size_t len, int nonblock,
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int flags, int *addr_len);
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extern void dccp_shutdown(struct sock *sk, int how);
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2005-12-14 00:24:16 -07:00
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extern int inet_dccp_listen(struct socket *sock, int backlog);
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extern unsigned int dccp_poll(struct file *file, struct socket *sock,
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poll_table *wait);
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extern int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr,
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int addr_len);
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2005-08-09 20:14:34 -07:00
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2006-03-20 20:25:24 -07:00
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extern int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code);
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2005-08-23 21:50:06 -07:00
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extern void dccp_send_close(struct sock *sk, const int active);
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2005-12-14 00:24:16 -07:00
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extern int dccp_invalid_packet(struct sk_buff *skb);
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static inline int dccp_bad_service_code(const struct sock *sk,
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2006-03-20 20:23:32 -07:00
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const __be32 service)
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2005-12-14 00:24:16 -07:00
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{
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const struct dccp_sock *dp = dccp_sk(sk);
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if (dp->dccps_service == service)
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return 0;
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return !dccp_list_has_service(dp->dccps_service_list, service);
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}
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2005-08-09 20:14:34 -07:00
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struct dccp_skb_cb {
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2005-09-16 16:58:40 -07:00
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__u8 dccpd_type:4;
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__u8 dccpd_ccval:4;
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__u8 dccpd_reset_code;
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__u16 dccpd_opt_len;
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2005-08-09 20:14:34 -07:00
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__u64 dccpd_seq;
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__u64 dccpd_ack_seq;
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};
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#define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0]))
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static inline int dccp_non_data_packet(const struct sk_buff *skb)
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{
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const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
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return type == DCCP_PKT_ACK ||
|
|
|
|
type == DCCP_PKT_CLOSE ||
|
|
|
|
type == DCCP_PKT_CLOSEREQ ||
|
|
|
|
type == DCCP_PKT_RESET ||
|
|
|
|
type == DCCP_PKT_SYNC ||
|
|
|
|
type == DCCP_PKT_SYNCACK;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline int dccp_packet_without_ack(const struct sk_buff *skb)
|
|
|
|
{
|
|
|
|
const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
|
|
|
|
|
|
|
|
return type == DCCP_PKT_DATA || type == DCCP_PKT_REQUEST;
|
|
|
|
}
|
|
|
|
|
|
|
|
#define DCCP_MAX_SEQNO ((((u64)1) << 48) - 1)
|
|
|
|
#define DCCP_PKT_WITHOUT_ACK_SEQ (DCCP_MAX_SEQNO << 2)
|
|
|
|
|
|
|
|
static inline void dccp_set_seqno(u64 *seqno, u64 value)
|
|
|
|
{
|
|
|
|
if (value > DCCP_MAX_SEQNO)
|
|
|
|
value -= DCCP_MAX_SEQNO + 1;
|
|
|
|
*seqno = value;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline u64 dccp_delta_seqno(u64 seqno1, u64 seqno2)
|
|
|
|
{
|
|
|
|
return ((seqno2 << 16) - (seqno1 << 16)) >> 16;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline void dccp_inc_seqno(u64 *seqno)
|
|
|
|
{
|
|
|
|
if (++*seqno > DCCP_MAX_SEQNO)
|
|
|
|
*seqno = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss)
|
|
|
|
{
|
2005-08-13 16:34:54 -07:00
|
|
|
struct dccp_hdr_ext *dhx = (struct dccp_hdr_ext *)((void *)dh +
|
|
|
|
sizeof(*dh));
|
2006-03-20 20:23:32 -07:00
|
|
|
dh->dccph_seq2 = 0;
|
|
|
|
dh->dccph_seq = htons((gss >> 32) & 0xfffff);
|
2005-08-09 20:14:34 -07:00
|
|
|
dhx->dccph_seq_low = htonl(gss & 0xffffffff);
|
|
|
|
}
|
|
|
|
|
2005-08-13 16:34:54 -07:00
|
|
|
static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack,
|
|
|
|
const u64 gsr)
|
2005-08-09 20:14:34 -07:00
|
|
|
{
|
2006-03-20 20:23:32 -07:00
|
|
|
dhack->dccph_reserved1 = 0;
|
|
|
|
dhack->dccph_ack_nr_high = htons(gsr >> 32);
|
2005-08-09 20:14:34 -07:00
|
|
|
dhack->dccph_ack_nr_low = htonl(gsr & 0xffffffff);
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline void dccp_update_gsr(struct sock *sk, u64 seq)
|
|
|
|
{
|
|
|
|
struct dccp_sock *dp = dccp_sk(sk);
|
2006-03-20 23:50:58 -07:00
|
|
|
const struct dccp_minisock *dmsk = dccp_msk(sk);
|
2005-08-09 20:14:34 -07:00
|
|
|
|
2005-08-21 01:36:45 -07:00
|
|
|
dp->dccps_gsr = seq;
|
|
|
|
dccp_set_seqno(&dp->dccps_swl,
|
2006-03-20 23:50:58 -07:00
|
|
|
dp->dccps_gsr + 1 - (dmsk->dccpms_sequence_window / 4));
|
2005-08-09 20:14:34 -07:00
|
|
|
dccp_set_seqno(&dp->dccps_swh,
|
2006-03-20 23:50:58 -07:00
|
|
|
dp->dccps_gsr + (3 * dmsk->dccpms_sequence_window) / 4);
|
2005-08-09 20:14:34 -07:00
|
|
|
}
|
|
|
|
|
|
|
|
static inline void dccp_update_gss(struct sock *sk, u64 seq)
|
|
|
|
{
|
|
|
|
struct dccp_sock *dp = dccp_sk(sk);
|
|
|
|
|
2005-08-21 01:36:45 -07:00
|
|
|
dp->dccps_awh = dp->dccps_gss = seq;
|
|
|
|
dccp_set_seqno(&dp->dccps_awl,
|
2005-08-13 16:34:54 -07:00
|
|
|
(dp->dccps_gss -
|
2006-03-20 23:50:58 -07:00
|
|
|
dccp_msk(sk)->dccpms_sequence_window + 1));
|
2005-08-09 20:14:34 -07:00
|
|
|
}
|
2005-09-18 00:17:51 -07:00
|
|
|
|
|
|
|
static inline int dccp_ack_pending(const struct sock *sk)
|
|
|
|
{
|
|
|
|
const struct dccp_sock *dp = dccp_sk(sk);
|
|
|
|
return dp->dccps_timestamp_echo != 0 ||
|
|
|
|
#ifdef CONFIG_IP_DCCP_ACKVEC
|
2006-03-20 23:50:58 -07:00
|
|
|
(dccp_msk(sk)->dccpms_send_ack_vector &&
|
2005-09-18 00:17:51 -07:00
|
|
|
dccp_ackvec_pending(dp->dccps_hc_rx_ackvec)) ||
|
|
|
|
#endif
|
|
|
|
inet_csk_ack_scheduled(sk);
|
|
|
|
}
|
2005-08-09 20:14:34 -07:00
|
|
|
|
2006-03-20 23:32:06 -07:00
|
|
|
extern int dccp_insert_options(struct sock *sk, struct sk_buff *skb);
|
|
|
|
extern int dccp_insert_option_elapsed_time(struct sock *sk,
|
2005-08-09 20:14:34 -07:00
|
|
|
struct sk_buff *skb,
|
|
|
|
u32 elapsed_time);
|
2006-03-20 23:32:06 -07:00
|
|
|
extern int dccp_insert_option_timestamp(struct sock *sk,
|
2005-08-23 21:51:36 -07:00
|
|
|
struct sk_buff *skb);
|
2006-03-20 23:32:06 -07:00
|
|
|
extern int dccp_insert_option(struct sock *sk, struct sk_buff *skb,
|
2005-08-09 20:14:34 -07:00
|
|
|
unsigned char option,
|
|
|
|
const void *value, unsigned char len);
|
|
|
|
|
2005-09-08 22:38:35 -07:00
|
|
|
extern void dccp_timestamp(const struct sock *sk, struct timeval *tv);
|
|
|
|
|
2005-08-27 14:18:18 -07:00
|
|
|
static inline suseconds_t timeval_usecs(const struct timeval *tv)
|
|
|
|
{
|
|
|
|
return tv->tv_sec * USEC_PER_SEC + tv->tv_usec;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline suseconds_t timeval_delta(const struct timeval *large,
|
|
|
|
const struct timeval *small)
|
|
|
|
{
|
|
|
|
time_t secs = large->tv_sec - small->tv_sec;
|
|
|
|
suseconds_t usecs = large->tv_usec - small->tv_usec;
|
|
|
|
|
|
|
|
if (usecs < 0) {
|
|
|
|
secs--;
|
|
|
|
usecs += USEC_PER_SEC;
|
|
|
|
}
|
|
|
|
return secs * USEC_PER_SEC + usecs;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline void timeval_add_usecs(struct timeval *tv,
|
|
|
|
const suseconds_t usecs)
|
|
|
|
{
|
|
|
|
tv->tv_usec += usecs;
|
|
|
|
while (tv->tv_usec >= USEC_PER_SEC) {
|
|
|
|
tv->tv_sec++;
|
|
|
|
tv->tv_usec -= USEC_PER_SEC;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline void timeval_sub_usecs(struct timeval *tv,
|
|
|
|
const suseconds_t usecs)
|
|
|
|
{
|
|
|
|
tv->tv_usec -= usecs;
|
|
|
|
while (tv->tv_usec < 0) {
|
|
|
|
tv->tv_sec--;
|
|
|
|
tv->tv_usec += USEC_PER_SEC;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2006-03-20 20:25:02 -07:00
|
|
|
#ifdef CONFIG_SYSCTL
|
|
|
|
extern int dccp_sysctl_init(void);
|
|
|
|
extern void dccp_sysctl_exit(void);
|
|
|
|
#else
|
|
|
|
static inline int dccp_sysctl_init(void)
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline void dccp_sysctl_exit(void)
|
|
|
|
{
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
2005-08-09 20:14:34 -07:00
|
|
|
#endif /* _DCCP_H */
|