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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 16:29:52 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 16:29:52 +0000 |
commit | ca67b09c015d4af3ae3cce12aa72e60941dbb8b5 (patch) | |
tree | b7316d7b06c373e08dabb79a2c866c568e08f49e /debian/grub-extras/disabled/gpxe/src/net/tcpip.c | |
parent | Adding upstream version 2.06. (diff) | |
download | grub2-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.c | 135 |
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 ); +} |