X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/d7e50217d7adf6e52786a38bcaa4cd698cb9a79e..6d2010ae8f7a6078e10b361c6962983bab233e0f:/bsd/netinet/tcp.h diff --git a/bsd/netinet/tcp.h b/bsd/netinet/tcp.h index 85ea2021a..a3a183bfe 100644 --- a/bsd/netinet/tcp.h +++ b/bsd/netinet/tcp.h @@ -1,16 +1,19 @@ /* - * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. + * Copyright (c) 2000-2011 Apple Computer, Inc. All rights reserved. * - * @APPLE_LICENSE_HEADER_START@ - * - * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved. + * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in - * compliance with the License. Please obtain a copy of the License at - * http://www.opensource.apple.com/apsl/ and read it before using this - * file. + * compliance with the License. The rights granted to you under the License + * may not be used to create, or enable the creation or redistribution of, + * unlawful or unlicensed copies of an Apple operating system, or to + * circumvent, violate, or enable the circumvention or violation of, any + * terms of an Apple operating system software license agreement. + * + * Please obtain a copy of the License at + * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER @@ -20,7 +23,7 @@ * Please see the License for the specific language governing rights and * limitations under the License. * - * @APPLE_LICENSE_HEADER_END@ + * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* * Copyright (c) 1982, 1986, 1993 @@ -61,9 +64,12 @@ #ifndef _NETINET_TCP_H_ #define _NETINET_TCP_H_ #include +#include +#include -typedef u_int32_t tcp_seq; -typedef u_int32_t tcp_cc; /* connection count per rfc1644 */ +#if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE) +typedef __uint32_t tcp_seq; +typedef __uint32_t tcp_cc; /* connection count per rfc1644 */ #define tcp6_seq tcp_seq /* for KAME src sync over BSD*'s */ #define tcp6hdr tcphdr /* for KAME src sync over BSD*'s */ @@ -73,19 +79,19 @@ typedef u_int32_t tcp_cc; /* connection count per rfc1644 */ * Per RFC 793, September, 1981. */ struct tcphdr { - u_short th_sport; /* source port */ - u_short th_dport; /* destination port */ + unsigned short th_sport; /* source port */ + unsigned short th_dport; /* destination port */ tcp_seq th_seq; /* sequence number */ tcp_seq th_ack; /* acknowledgement number */ -#if BYTE_ORDER == LITTLE_ENDIAN - u_int th_x2:4, /* (unused) */ - th_off:4; /* data offset */ +#if __DARWIN_BYTE_ORDER == __DARWIN_LITTLE_ENDIAN + unsigned int th_x2:4, /* (unused) */ + th_off:4; /* data offset */ #endif -#if BYTE_ORDER == BIG_ENDIAN - u_int th_off:4, /* data offset */ - th_x2:4; /* (unused) */ +#if __DARWIN_BYTE_ORDER == __DARWIN_BIG_ENDIAN + unsigned int th_off:4, /* data offset */ + th_x2:4; /* (unused) */ #endif - u_char th_flags; + unsigned char th_flags; #define TH_FIN 0x01 #define TH_SYN 0x02 #define TH_RST 0x04 @@ -96,26 +102,29 @@ struct tcphdr { #define TH_CWR 0x80 #define TH_FLAGS (TH_FIN|TH_SYN|TH_RST|TH_ACK|TH_URG|TH_ECE|TH_CWR) - u_short th_win; /* window */ - u_short th_sum; /* checksum */ - u_short th_urp; /* urgent pointer */ + unsigned short th_win; /* window */ + unsigned short th_sum; /* checksum */ + unsigned short th_urp; /* urgent pointer */ }; #define TCPOPT_EOL 0 #define TCPOPT_NOP 1 #define TCPOPT_MAXSEG 2 -#define TCPOLEN_MAXSEG 4 +#define TCPOLEN_MAXSEG 4 #define TCPOPT_WINDOW 3 -#define TCPOLEN_WINDOW 3 +#define TCPOLEN_WINDOW 3 #define TCPOPT_SACK_PERMITTED 4 /* Experimental */ -#define TCPOLEN_SACK_PERMITTED 2 +#define TCPOLEN_SACK_PERMITTED 2 #define TCPOPT_SACK 5 /* Experimental */ +#define TCPOLEN_SACK 8 /* len of sack block */ #define TCPOPT_TIMESTAMP 8 -#define TCPOLEN_TIMESTAMP 10 -#define TCPOLEN_TSTAMP_APPA (TCPOLEN_TIMESTAMP+2) /* appendix A */ -#define TCPOPT_TSTAMP_HDR \ +#define TCPOLEN_TIMESTAMP 10 +#define TCPOLEN_TSTAMP_APPA (TCPOLEN_TIMESTAMP+2) /* appendix A */ +#define TCPOPT_TSTAMP_HDR \ (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP) +#define MAX_TCPOPTLEN 40 /* Absolute maximum TCP options len */ + #define TCPOPT_CC 11 /* CC options: RFC-1644 */ #define TCPOPT_CCNEW 12 #define TCPOPT_CCECHO 13 @@ -123,15 +132,46 @@ struct tcphdr { #define TCPOLEN_CC_APPA (TCPOLEN_CC+2) #define TCPOPT_CC_HDR(ccopt) \ (TCPOPT_NOP<<24|TCPOPT_NOP<<16|(ccopt)<<8|TCPOLEN_CC) +#define TCPOPT_SIGNATURE 19 /* Keyed MD5: RFC 2385 */ +#define TCPOLEN_SIGNATURE 18 + +/* Option definitions */ +#define TCPOPT_SACK_PERMIT_HDR \ +(TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_SACK_PERMITTED<<8|TCPOLEN_SACK_PERMITTED) +#define TCPOPT_SACK_HDR (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_SACK<<8) +/* Miscellaneous constants */ +#define MAX_SACK_BLKS 6 /* Max # SACK blocks stored at sender side */ +#define TCP_MAX_SACK 3 /* MAX # SACKs sent in any segment */ + /* * Default maximum segment size for TCP. - * With an IP MSS of 576, this is 536, + * With an IP MTU of 576, this is 536, * but 512 is probably more convenient. * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)). */ #define TCP_MSS 512 +/* + * TCP_MINMSS is defined to be 216 which is fine for the smallest + * link MTU (256 bytes, SLIP interface) in the Internet. + * However it is very unlikely to come across such low MTU interfaces + * these days (anno dato 2004). + * Probably it can be set to 512 without ill effects. But we play safe. + * See tcp_subr.c tcp_minmss SYSCTL declaration for more comments. + * Setting this to "0" disables the minmss check. + */ +#define TCP_MINMSS 216 + +/* + * TCP_MINMSSOVERLOAD is defined to be 1000 which should cover any type + * of interactive TCP session. + * See tcp_subr.c tcp_minmssoverload SYSCTL declaration and tcp_input.c + * for more comments. + * Setting this to "0" disables the minmssoverload check. + */ +#define TCP_MINMSSOVERLOAD 1000 + /* * Default maximum segment size for TCP6. * With an IP6 MSS of 1280, this is 1220, @@ -145,18 +185,105 @@ struct tcphdr { #define TCP_MAX_WINSHIFT 14 /* maximum window shift */ -#define TCP_MAXBURST 4 /* maximum segments in a burst */ - #define TCP_MAXHLEN (0xf<<2) /* max length of header in bytes */ #define TCP_MAXOLEN (TCP_MAXHLEN - sizeof(struct tcphdr)) /* max space left for options */ +#endif /* (_POSIX_C_SOURCE && !_DARWIN_C_SOURCE) */ /* * User-settable options (used with setsockopt). */ -#define TCP_NODELAY 0x01 /* don't delay send to coalesce packets */ -#define TCP_MAXSEG 0x02 /* set maximum segment size */ -#define TCP_NOPUSH 0x04 /* don't push last block of write */ -#define TCP_NOOPT 0x08 /* don't use TCP options */ +#define TCP_NODELAY 0x01 /* don't delay send to coalesce packets */ +#if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE) +#define TCP_MAXSEG 0x02 /* set maximum segment size */ +#define TCP_NOPUSH 0x04 /* don't push last block of write */ +#define TCP_NOOPT 0x08 /* don't use TCP options */ +#define TCP_KEEPALIVE 0x10 /* idle time used when SO_KEEPALIVE is enabled */ +#define TCP_CONNECTIONTIMEOUT 0x20 /* connection timeout */ +#define PERSIST_TIMEOUT 0x40 /* time after which a connection in + * persist timeout will terminate. + * see draft-ananth-tcpm-persist-02.txt + */ +#define TCP_RXT_CONNDROPTIME 0x80 /* time after which tcp retransmissions will be + * stopped and the connection will be dropped + */ +#define TCP_RXT_FINDROP 0x100 /* when this option is set, drop a connection + * after retransmitting the FIN 3 times. It will + * prevent holding too many mbufs in socket + * buffer queues. + */ +#ifdef PRIVATE +#define TCP_INFO 0x200 /* retrieve tcp_info structure */ + +/* + * The TCP_INFO socket option comes from the Linux 2.6 TCP API, and permits + * the caller to query certain information about the state of a TCP + * connection. We provide an overlapping set of fields with the Linux + * implementation, but since this is a fixed size structure, room has been + * left for growth. In order to maximize potential future compatibility with + * the Linux API, the same variable names and order have been adopted, and + * padding left to make room for omitted fields in case they are added later. + * + * XXX: This is currently an unstable ABI/API, in that it is expected to + * change. + */ +#pragma pack(4) + +#define TCPI_OPT_TIMESTAMPS 0x01 +#define TCPI_OPT_SACK 0x02 +#define TCPI_OPT_WSCALE 0x04 +#define TCPI_OPT_ECN 0x08 + +struct tcp_info { + u_int8_t tcpi_state; /* TCP FSM state. */ + u_int8_t tcpi_options; /* Options enabled on conn. */ + u_int8_t tcpi_snd_wscale; /* RFC1323 send shift value. */ + u_int8_t tcpi_rcv_wscale; /* RFC1323 recv shift value. */ + + u_int32_t tcpi_snd_mss; /* Max segment size for send. */ + u_int32_t tcpi_rcv_mss; /* Max segment size for receive. */ + + u_int32_t tcpi_snd_ssthresh; /* Slow start threshold. */ + u_int32_t tcpi_snd_cwnd; /* Send congestion window. */ + + u_int32_t tcpi_rcv_space; /* Advertised recv window. */ + + u_int32_t tcpi_snd_wnd; /* Advertised send window. */ + u_int32_t tcpi_snd_bwnd; /* Bandwidth send window. */ + u_int32_t tcpi_snd_nxt; /* Next egress seqno */ + u_int32_t tcpi_rcv_nxt; /* Next ingress seqno */ + + int32_t tcpi_last_outif; /* if_index of interface used to send last */ +}; + +/* + * Note that IPv6 link local addresses should have the appropriate scope ID + */ + +struct info_tuple { + u_int8_t itpl_proto; + union { + struct sockaddr _itpl_sa; + struct sockaddr_in _itpl_sin; + struct sockaddr_in6 _itpl_sin6; + } itpl_localaddr; + union { + struct sockaddr _itpl_sa; + struct sockaddr_in _itpl_sin; + struct sockaddr_in6 _itpl_sin6; + } itpl_remoteaddr; +}; + +#define itpl_local_sa itpl_localaddr._itpl_sa +#define itpl_local_sin itpl_localaddr._itpl_sin +#define itpl_local_sin6 itpl_localaddr._itpl_sin6 +#define itpl_remote_sa itpl_remoteaddr._itpl_sa +#define itpl_remote_sin itpl_remoteaddr._itpl_sin +#define itpl_remote_sin6 itpl_remoteaddr._itpl_sin6 + +#pragma pack() + +#endif /* PRIVATE */ +#endif /* (_POSIX_C_SOURCE && !_DARWIN_C_SOURCE) */ #endif