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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 16:29:52 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 16:29:52 +0000
commitca67b09c015d4af3ae3cce12aa72e60941dbb8b5 (patch)
treeb7316d7b06c373e08dabb79a2c866c568e08f49e /debian/grub-extras/disabled/gpxe/src/net/tcpip.c
parentAdding upstream version 2.06. (diff)
downloadgrub2-ca67b09c015d4af3ae3cce12aa72e60941dbb8b5.tar.xz
grub2-ca67b09c015d4af3ae3cce12aa72e60941dbb8b5.zip
Adding debian version 2.06-13+deb12u1.debian/2.06-13+deb12u1debian
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'debian/grub-extras/disabled/gpxe/src/net/tcpip.c')
-rw-r--r--debian/grub-extras/disabled/gpxe/src/net/tcpip.c135
1 files changed, 135 insertions, 0 deletions
diff --git a/debian/grub-extras/disabled/gpxe/src/net/tcpip.c b/debian/grub-extras/disabled/gpxe/src/net/tcpip.c
new file mode 100644
index 0000000..932fd48
--- /dev/null
+++ b/debian/grub-extras/disabled/gpxe/src/net/tcpip.c
@@ -0,0 +1,135 @@
+#include <stdint.h>
+#include <string.h>
+#include <errno.h>
+#include <byteswap.h>
+#include <gpxe/iobuf.h>
+#include <gpxe/tables.h>
+#include <gpxe/tcpip.h>
+
+/** @file
+ *
+ * Transport-network layer interface
+ *
+ * This file contains functions and utilities for the
+ * TCP/IP transport-network layer interface
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+/** Process a received TCP/IP packet
+ *
+ * @v iobuf I/O buffer
+ * @v tcpip_proto Transport-layer protocol number
+ * @v st_src Partially-filled source address
+ * @v st_dest Partially-filled destination address
+ * @v pshdr_csum Pseudo-header checksum
+ * @ret rc Return status code
+ *
+ * This function expects a transport-layer segment from the network
+ * layer. The network layer should fill in as much as it can of the
+ * source and destination addresses (i.e. it should fill in the
+ * address family and the network-layer addresses, but leave the ports
+ * and the rest of the structures as zero).
+ */
+int tcpip_rx ( struct io_buffer *iobuf, uint8_t tcpip_proto,
+ struct sockaddr_tcpip *st_src,
+ struct sockaddr_tcpip *st_dest,
+ uint16_t pshdr_csum ) {
+ struct tcpip_protocol *tcpip;
+
+ /* Hand off packet to the appropriate transport-layer protocol */
+ for_each_table_entry ( tcpip, TCPIP_PROTOCOLS ) {
+ if ( tcpip->tcpip_proto == tcpip_proto ) {
+ DBG ( "TCP/IP received %s packet\n", tcpip->name );
+ return tcpip->rx ( iobuf, st_src, st_dest, pshdr_csum );
+ }
+ }
+
+ DBG ( "Unrecognised TCP/IP protocol %d\n", tcpip_proto );
+ free_iob ( iobuf );
+ return -EPROTONOSUPPORT;
+}
+
+/** Transmit a TCP/IP packet
+ *
+ * @v iobuf I/O buffer
+ * @v tcpip_protocol Transport-layer protocol
+ * @v st_src Source address, or NULL to use route default
+ * @v st_dest Destination address
+ * @v netdev Network device to use if no route found, or NULL
+ * @v trans_csum Transport-layer checksum to complete, or NULL
+ * @ret rc Return status code
+ */
+int tcpip_tx ( struct io_buffer *iobuf, struct tcpip_protocol *tcpip_protocol,
+ struct sockaddr_tcpip *st_src, struct sockaddr_tcpip *st_dest,
+ struct net_device *netdev, uint16_t *trans_csum ) {
+ struct tcpip_net_protocol *tcpip_net;
+
+ /* Hand off packet to the appropriate network-layer protocol */
+ for_each_table_entry ( tcpip_net, TCPIP_NET_PROTOCOLS ) {
+ if ( tcpip_net->sa_family == st_dest->st_family ) {
+ DBG ( "TCP/IP sending %s packet\n", tcpip_net->name );
+ return tcpip_net->tx ( iobuf, tcpip_protocol, st_src,
+ st_dest, netdev, trans_csum );
+ }
+ }
+
+ DBG ( "Unrecognised TCP/IP address family %d\n", st_dest->st_family );
+ free_iob ( iobuf );
+ return -EAFNOSUPPORT;
+}
+
+/**
+ * Calculate continued TCP/IP checkum
+ *
+ * @v partial Checksum of already-summed data, in network byte order
+ * @v data Data buffer
+ * @v len Length of data buffer
+ * @ret cksum Updated checksum, in network byte order
+ *
+ * Calculates a TCP/IP-style 16-bit checksum over the data block. The
+ * checksum is returned in network byte order.
+ *
+ * This function may be used to add new data to an existing checksum.
+ * The function assumes that both the old data and the new data start
+ * on even byte offsets; if this is not the case then you will need to
+ * byte-swap either the input partial checksum, the output checksum,
+ * or both. Deciding which to swap is left as an exercise for the
+ * interested reader.
+ */
+uint16_t tcpip_continue_chksum ( uint16_t partial, const void *data,
+ size_t len ) {
+ unsigned int cksum = ( ( ~partial ) & 0xffff );
+ unsigned int value;
+ unsigned int i;
+
+ for ( i = 0 ; i < len ; i++ ) {
+ value = * ( ( uint8_t * ) data + i );
+ if ( i & 1 ) {
+ /* Odd bytes: swap on little-endian systems */
+ value = be16_to_cpu ( value );
+ } else {
+ /* Even bytes: swap on big-endian systems */
+ value = le16_to_cpu ( value );
+ }
+ cksum += value;
+ if ( cksum > 0xffff )
+ cksum -= 0xffff;
+ }
+
+ return ( ~cksum );
+}
+
+/**
+ * Calculate TCP/IP checkum
+ *
+ * @v data Data buffer
+ * @v len Length of data buffer
+ * @ret cksum Checksum, in network byte order
+ *
+ * Calculates a TCP/IP-style 16-bit checksum over the data block. The
+ * checksum is returned in network byte order.
+ */
+uint16_t tcpip_chksum ( const void *data, size_t len ) {
+ return tcpip_continue_chksum ( TCPIP_EMPTY_CSUM, data, len );
+}