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/*
* Stream Control Transmission Protocol (RFC 2960).
*
* Copyright (c) 2008 Daniel Roethlisberger <daniel@roe.ch>
* Copyright (c) 2000 Dug Song <dugsong@monkey.org>
*
*/
#ifndef SCTP_H
#define SCTP_H
#define SCTP_HDR_LEN 12
struct sctp_hdr {
uint16_t sh_sport; /* source port */
uint16_t sh_dport; /* destination port */
uint32_t sh_vtag; /* sctp verification tag */
uint32_t sh_sum; /* sctp checksum */
};
#define SCTP_PORT_MAX 65535
#define sctp_pack_hdr(hdr, sport, dport, vtag) do { \
struct sctp_hdr *sctp_pack_p = (struct sctp_hdr *)(hdr); \
sctp_pack_p->sh_sport = htons(sport); \
sctp_pack_p->sh_dport = htons(dport); \
sctp_pack_p->sh_vtag = htonl(vtag); \
} while (0)
struct sctp_chunkhdr {
uint8_t sch_type; /* chunk type */
uint8_t sch_flags; /* chunk flags */
uint16_t sch_length; /* chunk length */
};
/* chunk types */
#define SCTP_DATA 0x00
#define SCTP_INIT 0x01
#define SCTP_INIT_ACK 0x02
#define SCTP_SACK 0x03
#define SCTP_HEARTBEAT 0x04
#define SCTP_HEARTBEAT_ACK 0x05
#define SCTP_ABORT 0x06
#define SCTP_SHUTDOWN 0x07
#define SCTP_SHUTDOWN_ACK 0x08
#define SCTP_ERROR 0x09
#define SCTP_COOKIE_ECHO 0x0a
#define SCTP_COOKIE_ACK 0x0b
#define SCTP_ECNE 0x0c
#define SCTP_CWR 0x0d
#define SCTP_SHUTDOWN_COMPLETE 0x0e
#define SCTP_AUTH 0x0f /* RFC 4895 */
#define SCTP_ASCONF_ACK 0x80 /* RFC 5061 */
#define SCTP_PKTDROP 0x81 /* draft-stewart-sctp-pktdrprep-08 */
#define SCTP_PAD 0x84 /* RFC 4820 */
#define SCTP_FORWARD_TSN 0xc0 /* RFC 3758 */
#define SCTP_ASCONF 0xc1 /* RFC 5061 */
/* chunk types bitmask flags */
#define SCTP_TYPEFLAG_REPORT 1
#define SCTP_TYPEFLAG_SKIP 2
#define sctp_pack_chunkhdr(hdr, type, flags, length) do { \
struct sctp_chunkhdr *sctp_pack_chp = (struct sctp_chunkhdr *)(hdr);\
sctp_pack_chp->sch_type = type; \
sctp_pack_chp->sch_flags = flags; \
sctp_pack_chp->sch_length = htons(length); \
} while (0)
struct sctp_chunkhdr_init {
struct sctp_chunkhdr chunkhdr;
int32_t schi_itag; /* Initiate Tag */
int32_t schi_arwnd; /* Advertised Receiver Window Credit */
int16_t schi_nos; /* Number of Outbound Streams */
int16_t schi_nis; /* Number of Inbound Streams */
int32_t schi_itsn; /* Initial TSN */
};
#define sctp_pack_chunkhdr_init(hdr, type, flags, length, itag, \
arwnd, nos, nis, itsn) do { \
struct sctp_chunkhdr_init *sctp_pack_chip = (struct sctp_chunkhdr_init *)(hdr);\
sctp_pack_chunkhdr(sctp_pack_chip, type, flags, length);\
sctp_pack_chip->schi_itag = htonl(itag); \
sctp_pack_chip->schi_arwnd = htonl(arwnd); \
sctp_pack_chip->schi_nos = htons(nos); \
sctp_pack_chip->schi_nis = htons(nis); \
sctp_pack_chip->schi_itsn = htonl(itsn); \
} while (0)
/*
* COOKIE ECHO chunk
*/
struct sctp_chunkhdr_cookie_echo {
struct sctp_chunkhdr chunkhdr;
/* empty */
};
#define sctp_pack_chunkhdr_cookie_echo(hdr, type, flags, length) do { \
struct sctp_chunkhdr_cookie_echo *sctp_pack_chip = \
(struct sctp_chunkhdr_cookie_echo *)(hdr); \
sctp_pack_chunkhdr(sctp_pack_chip, type, flags, length); \
} while (0)
#endif /* SCTP_H */
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