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#ifndef _DCCP_H
#define _DCCP_H
* net/dccp/dccp.h
* An implementation of the DCCP protocol
* Copyright (c) 2005 Arnaldo Carvalho de Melo <>
* Copyright (c) 2005-6 Ian McDonald <>
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
#include <linux/dccp.h>
#include <net/snmp.h>
#include <net/sock.h>
#include <net/tcp.h>
#include "ackvec.h"
extern int dccp_debug;
#define dccp_pr_debug(format, a...) \
do { if (dccp_debug) \
printk(KERN_DEBUG "%s: " format, __FUNCTION__ , ##a); \
} while (0)
#define dccp_pr_debug_cat(format, a...) do { if (dccp_debug) \
printk(format, ##a); } while (0)
#define dccp_pr_debug(format, a...)
#define dccp_pr_debug_cat(format, a...)
extern struct inet_hashinfo dccp_hashinfo;
extern atomic_t dccp_orphan_count;
extern int dccp_tw_count;
extern void dccp_tw_deschedule(struct inet_timewait_sock *tw);
extern void dccp_time_wait(struct sock *sk, int state, int timeo);
/* FIXME: Right size this */
#define DCCP_MAX_OPT_LEN 128
#define DCCP_TIMEWAIT_LEN (60 * HZ) /* how long to wait to destroy TIME-WAIT
* state, about 60 seconds */
/* draft-ietf-dccp-spec-11.txt initial RTO value */
#define DCCP_TIMEOUT_INIT ((unsigned)(3 * HZ))
/* Maximal interval between probes for local resources. */
#define DCCP_RESOURCE_PROBE_INTERVAL ((unsigned)(HZ / 2U))
#define DCCP_RTO_MAX ((unsigned)(120 * HZ)) /* FIXME: using TCP value */
/* is seq1 < seq2 ? */
static inline int before48(const u64 seq1, const u64 seq2)
return (s64)((seq1 << 16) - (seq2 << 16)) < 0;
/* is seq1 > seq2 ? */
static inline int after48(const u64 seq1, const u64 seq2)
return (s64)((seq2 << 16) - (seq1 << 16)) < 0;
/* is seq2 <= seq1 <= seq3 ? */
static inline int between48(const u64 seq1, const u64 seq2, const u64 seq3)
return (seq3 << 16) - (seq2 << 16) >= (seq1 << 16) - (seq2 << 16);
static inline u64 max48(const u64 seq1, const u64 seq2)
return after48(seq1, seq2) ? seq1 : seq2;
/* is seq1 next seqno after seq2 */
static inline int follows48(const u64 seq1, const u64 seq2)
int diff = (seq1 & 0xFFFF) - (seq2 & 0xFFFF);
return diff==1;
enum {
struct dccp_mib {
unsigned long mibs[DCCP_MIB_MAX];
DECLARE_SNMP_STAT(struct dccp_mib, dccp_statistics);
#define DCCP_INC_STATS(field) SNMP_INC_STATS(dccp_statistics, field)
#define DCCP_INC_STATS_BH(field) SNMP_INC_STATS_BH(dccp_statistics, field)
#define DCCP_INC_STATS_USER(field) SNMP_INC_STATS_USER(dccp_statistics, field)
#define DCCP_DEC_STATS(field) SNMP_DEC_STATS(dccp_statistics, field)
#define DCCP_ADD_STATS_BH(field, val) \
SNMP_ADD_STATS_BH(dccp_statistics, field, val)
#define DCCP_ADD_STATS_USER(field, val) \
SNMP_ADD_STATS_USER(dccp_statistics, field, val)
extern int dccp_retransmit_skb(struct sock *sk, struct sk_buff *skb);
extern void dccp_send_ack(struct sock *sk);
extern void dccp_send_delayed_ack(struct sock *sk);
extern void dccp_send_sync(struct sock *sk, const u64 seq,
const enum dccp_pkt_type pkt_type);
extern void dccp_write_xmit(struct sock *sk, int block);
extern void dccp_write_space(struct sock *sk);
extern void dccp_init_xmit_timers(struct sock *sk);
static inline void dccp_clear_xmit_timers(struct sock *sk)
extern unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu);
extern const char *dccp_packet_name(const int type);
extern const char *dccp_state_name(const int state);
extern void dccp_set_state(struct sock *sk, const int state);
extern void dccp_done(struct sock *sk);
static inline void dccp_openreq_init(struct request_sock *req,
struct dccp_sock *dp,
struct sk_buff *skb)
* FIXME: fill in the other req fields from the DCCP options
* received
inet_rsk(req)->rmt_port = dccp_hdr(skb)->dccph_sport;
inet_rsk(req)->acked = 0;
req->rcv_wnd = 0;
extern int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb);
extern struct sock *dccp_create_openreq_child(struct sock *sk,
const struct request_sock *req,
const struct sk_buff *skb);
extern int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb);
extern struct sock *dccp_v4_request_recv_sock(struct sock *sk,
struct sk_buff *skb,
struct request_sock *req,
struct dst_entry *dst);
extern struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb,
struct request_sock *req,
struct request_sock **prev);
extern int dccp_child_process(struct sock *parent, struct sock *child,
struct sk_buff *skb);
extern int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
struct dccp_hdr *dh, unsigned len);
extern int dccp_rcv_established(struct sock *sk, struct sk_buff *skb,
const struct dccp_hdr *dh, const unsigned len);
extern int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized);
extern int dccp_destroy_sock(struct sock *sk);
extern void dccp_close(struct sock *sk, long timeout);
extern struct sk_buff *dccp_make_response(struct sock *sk,
struct dst_entry *dst,
struct request_sock *req);
extern int dccp_connect(struct sock *sk);
extern int dccp_disconnect(struct sock *sk, int flags);
extern void dccp_hash(struct sock *sk);
extern void dccp_unhash(struct sock *sk);
extern int dccp_getsockopt(struct sock *sk, int level, int optname,
char __user *optval, int __user *optlen);
extern int dccp_setsockopt(struct sock *sk, int level, int optname,
char __user *optval, int optlen);
extern int compat_dccp_getsockopt(struct sock *sk,
int level, int optname,
char __user *optval, int __user *optlen);
extern int compat_dccp_setsockopt(struct sock *sk,
int level, int optname,
char __user *optval, int optlen);
extern int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg);
extern int dccp_sendmsg(struct kiocb *iocb, struct sock *sk,
struct msghdr *msg, size_t size);
extern int dccp_recvmsg(struct kiocb *iocb, struct sock *sk,
struct msghdr *msg, size_t len, int nonblock,
int flags, int *addr_len);
extern void dccp_shutdown(struct sock *sk, int how);
extern int inet_dccp_listen(struct socket *sock, int backlog);
extern unsigned int dccp_poll(struct file *file, struct socket *sock,
poll_table *wait);
extern void dccp_v4_send_check(struct sock *sk, int len,
struct sk_buff *skb);
extern int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr,
int addr_len);
extern int dccp_v4_checksum(const struct sk_buff *skb,
const __be32 saddr, const __be32 daddr);
extern int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code);
extern void dccp_send_close(struct sock *sk, const int active);
extern int dccp_invalid_packet(struct sk_buff *skb);
static inline int dccp_bad_service_code(const struct sock *sk,
const __be32 service)
const struct dccp_sock *dp = dccp_sk(sk);
if (dp->dccps_service == service)
return 0;
return !dccp_list_has_service(dp->dccps_service_list, service);
struct dccp_skb_cb {
__u8 dccpd_type:4;
__u8 dccpd_ccval:4;
__u8 dccpd_reset_code;
__u16 dccpd_opt_len;
__u64 dccpd_seq;
__u64 dccpd_ack_seq;
#define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0]))
static inline int dccp_non_data_packet(const struct sk_buff *skb)
const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
return type == DCCP_PKT_ACK ||
type == DCCP_PKT_CLOSE ||
type == DCCP_PKT_RESET ||
type == DCCP_PKT_SYNC ||
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)
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)
struct dccp_hdr_ext *dhx = (struct dccp_hdr_ext *)((void *)dh +
dh->dccph_seq2 = 0;
dh->dccph_seq = htons((gss >> 32) & 0xfffff);
dhx->dccph_seq_low = htonl(gss & 0xffffffff);
static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack,
const u64 gsr)
dhack->dccph_reserved1 = 0;
dhack->dccph_ack_nr_high = htons(gsr >> 32);
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);
const struct dccp_minisock *dmsk = dccp_msk(sk);
dp->dccps_gsr = seq;
dp->dccps_gsr + 1 - (dmsk->dccpms_sequence_window / 4));
dp->dccps_gsr + (3 * dmsk->dccpms_sequence_window) / 4);
static inline void dccp_update_gss(struct sock *sk, u64 seq)
struct dccp_sock *dp = dccp_sk(sk);
dp->dccps_awh = dp->dccps_gss = seq;
(dp->dccps_gss -
dccp_msk(sk)->dccpms_sequence_window + 1));
static inline int dccp_ack_pending(const struct sock *sk)
const struct dccp_sock *dp = dccp_sk(sk);
return dp->dccps_timestamp_echo != 0 ||
(dccp_msk(sk)->dccpms_send_ack_vector &&
dccp_ackvec_pending(dp->dccps_hc_rx_ackvec)) ||
extern int dccp_insert_options(struct sock *sk, struct sk_buff *skb);
extern int dccp_insert_option_elapsed_time(struct sock *sk,
struct sk_buff *skb,
u32 elapsed_time);
extern int dccp_insert_option_timestamp(struct sock *sk,
struct sk_buff *skb);
extern int dccp_insert_option(struct sock *sk, struct sk_buff *skb,
unsigned char option,
const void *value, unsigned char len);
extern void dccp_timestamp(const struct sock *sk, struct timeval *tv);
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) {
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_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_usec += USEC_PER_SEC;
extern int dccp_sysctl_init(void);
extern void dccp_sysctl_exit(void);
static inline int dccp_sysctl_init(void)
return 0;
static inline void dccp_sysctl_exit(void)
#endif /* _DCCP_H */