xnu-792.2.4.tar.gz

[apple/xnu.git] / bsd / netinet / tcp.h

diff --git a/bsd/netinet/tcp.h b/bsd/netinet/tcp.h
index 39efb3d79c6a822054596343a5eb0fc92cba38f1..89e6ba826e03b0241d9b241459ead6e6abe23b50 100644 (file)
--- a/bsd/netinet/tcp.h
+++ b/bsd/netinet/tcp.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
  *
  * @APPLE_LICENSE_HEADER_START@
  * 
@@ -58,9 +58,12 @@
 #ifndef _NETINET_TCP_H_
 #define _NETINET_TCP_H_
 #include <sys/appleapiopts.h>
+#include <sys/_types.h>
+#include <machine/endian.h>
 
-typedef        u_int32_t tcp_seq;
-typedef u_int32_t tcp_cc;              /* connection count per rfc1644 */
+#ifndef _POSIX_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 */
@@ -70,19 +73,19 @@ 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
@@ -93,9 +96,9 @@ 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
@@ -123,12 +126,32 @@ struct tcphdr {
 
 /*
  * 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,
@@ -147,13 +170,17 @@ struct tcphdr {
 #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 */
 
 /*
  * User-settable options (used with setsockopt).
  */
 #define        TCP_NODELAY     0x01    /* don't delay send to coalesce packets */
+#ifndef _POSIX_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 */
+#endif /* _POSIX_C_SOURCE */
 
 #endif