From c9ea71093067ccf1d8473df257d55da39f8f74da Mon Sep 17 00:00:00 2001
From: Nikhil Chandru Rao
Date: Wed, 28 Jun 2006 15:43:08 +0000
Subject: Renamed net/interface.c and include/gpxe/interface.h to
 net/tcpip_if.c and include/gpxe/tcpip_if.h respectively. Made changes in the
 other files.

---
 src/net/tcpip_if.c | 136 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 136 insertions(+)
 create mode 100644 src/net/tcpip_if.c

(limited to 'src/net/tcpip_if.c')

diff --git a/src/net/tcpip_if.c b/src/net/tcpip_if.c
new file mode 100644
index 00000000..5c5e5962
--- /dev/null
+++ b/src/net/tcpip_if.c
@@ -0,0 +1,136 @@
+#include <stdint.h>
+#include <string.h>
+#include <errno.h>
+#include <malloc.h>
+#include <byteswap.h>
+#include <gpxe/in.h>
+#include <gpxe/ip.h>
+#include <gpxe/pkbuff.h>
+#include <gpxe/tables.h>
+#include <gpxe/netdevice.h>
+#include <gpxe/tcpip_if.h>
+
+/** @file
+ *
+ * Transport-network layer interface
+ *
+ * This file contains functions and utilities for the transport-network layer interface
+ */
+
+/** Registered network-layer protocols that support TCPIP */
+static struct tcpip_net_protocol tcpip_net_protocols[0] __table_start ( tcpip_net_protocols );
+static struct tcpip_net_protocol tcpip_net_protocols_end[0] __table_end ( tcpip_net_protocols );
+
+struct tcpip_protocol;
+
+/** Registered transport-layer protocols that support TCPIP */
+static struct tcpip_protocol tcpip_protocols[0] __table_start ( tcpip_protocols );
+static struct tcpip_protocol tcpip_protocols_end[0] __table_end ( tcpip_protocols );
+
+/** Identify TCPIP network-layer protocol
+ *
+ * @v sa_family	 Network address family
+ * @ret tcpip	   Protocol supporting TCPIP, or NULL
+ */
+static struct tcpip_net_protocol * tcpip_find_protocol ( sa_family_t sa_family ) {
+	struct tcpip_net_protocol *tcpip_net;
+
+	for ( tcpip_net = tcpip_net_protocols; 
+		tcpip_net < tcpip_net_protocols_end; ++tcpip_net ) {
+		if ( tcpip_net->sa_family == sa_family ) {
+			return tcpip_net;
+		}
+	}
+	return NULL;
+}
+
+/** Identify TCPIP transport-layer protocol
+ *
+ * @v trans_proto	Transport-layer protocol number, IP_XXX
+ * @ret tcpip_protocol	Transport-layer protocol, or NULL
+ */
+struct tcpip_protocol* find_tcpip_protocol ( uint8_t trans_proto ) {
+	struct tcpip_protocol *tcpip;
+
+	for ( tcpip = tcpip_protocols; tcpip <= tcpip_protocols_end; 
+		++tcpip ) {
+		if ( tcpip->trans_proto == trans_proto ) {
+			return tcpip;
+		}
+	}
+	return NULL;
+}
+
+/** Process a received packet
+ *
+ * @v pkb		Packet buffer
+ * @v trans_proto	Transport-layer protocol number
+ * @v src		Source network-layer address
+ * @v dest		Destination network-layer address
+ *
+ * This function expects a transport-layer segment from the network-layer
+ */
+void trans_rx ( struct pk_buff *pkb, uint8_t trans_proto, struct in_addr *src,
+		struct in_addr *dest ) {
+	struct tcpip_protocol *tcpip;
+
+	/* Identify the transport layer protocol */
+	for ( tcpip = tcpip_protocols; tcpip <= tcpip_protocols_end; ++tcpip ) {
+		if ( tcpip->trans_proto == trans_proto ) {
+			DBG ( "Packet sent to %s module", tcpip->name );
+			tcpip->rx ( pkb, src, dest );
+		}
+	}
+}
+
+/** Transmit a transport-layer segment
+ *
+ * @v pkb		Packet buffer
+ * @v trans_proto	Transport-layer protocol
+ * @v sock		Destination socket address
+ * @ret			Status
+ */
+int trans_tx ( struct pk_buff *pkb, struct tcpip_protocol *tcpip,
+	       struct sockaddr *sock ) {
+
+	/* Identify the network layer protocol and send it using xxx_tx() */
+	switch ( sock->sa_family ) {
+	case AF_INET: /* IPv4 network family */
+		return ipv4_tx ( pkb, tcpip, &sock->sin.sin_addr );
+	case AF_INET6: /* IPv6 network family */
+		return ipv6_tx ( pkb, tcpip, &sock->sin6.sin6_addr );
+	}
+	DBG ( "Network family %d not supported", sock->sa_family );
+	return -EAFNOSUPPORT;
+}
+
+/**
+ * Calculate internet checksum
+ *
+ * @v data      Pointer to the data
+ * @v len       Length of data to be checksummed
+ * @ret chksum  16 bit internet checksum
+ *
+ * This function calculates the internet checksum (refer RFC1071) for "len"
+ * bytes beginning at the location "data"
+ */
+uint16_t calc_chksum ( void *data, size_t len ) {
+	register long sum = 0;
+	uint16_t checksum;
+	unsigned short *temp;
+	while ( len > 1 ) {
+		temp = (unsigned short*) data++;
+		sum += *temp;
+		len -= 2;
+	}
+	if ( len > 0 ) {
+		sum += *(unsigned char *)data;
+	}
+	while ( sum >> 16 ) {
+		sum = ( sum & 0xffff ) + ( sum >> 16 );
+	}
+	checksum = ~sum;
+	return checksum;
+}
+
+
-- 
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