diff options
Diffstat (limited to 'qemu/roms/ipxe/src/net/tcpip.c')
| -rw-r--r-- | qemu/roms/ipxe/src/net/tcpip.c | 250 |
1 files changed, 0 insertions, 250 deletions
diff --git a/qemu/roms/ipxe/src/net/tcpip.c b/qemu/roms/ipxe/src/net/tcpip.c deleted file mode 100644 index 5ad982fd1..000000000 --- a/qemu/roms/ipxe/src/net/tcpip.c +++ /dev/null @@ -1,250 +0,0 @@ -#include <stdint.h> -#include <stdlib.h> -#include <string.h> -#include <errno.h> -#include <byteswap.h> -#include <ipxe/iobuf.h> -#include <ipxe/tables.h> -#include <ipxe/ipstat.h> -#include <ipxe/netdevice.h> -#include <ipxe/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_OR_UBDL ); - -/** - * Process a received TCP/IP packet - * - * @v iobuf I/O buffer - * @v netdev Network device - * @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 - * @v stats IP statistics - * @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, struct net_device *netdev, - uint8_t tcpip_proto, struct sockaddr_tcpip *st_src, - struct sockaddr_tcpip *st_dest, uint16_t pshdr_csum, - struct ip_statistics *stats ) { - 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 ); - stats->in_delivers++; - return tcpip->rx ( iobuf, netdev, st_src, st_dest, - pshdr_csum ); - } - } - - DBG ( "Unrecognised TCP/IP protocol %d\n", tcpip_proto ); - stats->in_unknown_protos++; - free_iob ( iobuf ); - return -EPROTONOSUPPORT; -} - -/** - * Find TCP/IP network-layer protocol - * - * @v st_dest Destination address - * @ret tcpip_net TCP/IP network-layer protocol, or NULL if not found - */ -static struct tcpip_net_protocol * -tcpip_net_protocol ( struct sockaddr_tcpip *st_dest ) { - struct tcpip_net_protocol *tcpip_net; - - for_each_table_entry ( tcpip_net, TCPIP_NET_PROTOCOLS ) { - if ( tcpip_net->sa_family == st_dest->st_family ) - return tcpip_net; - } - - DBG ( "Unrecognised TCP/IP address family %d\n", st_dest->st_family ); - return NULL; -} - -/** - * 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 */ - tcpip_net = tcpip_net_protocol ( st_dest ); - if ( tcpip_net ) { - DBG ( "TCP/IP sending %s packet\n", tcpip_net->name ); - return tcpip_net->tx ( iobuf, tcpip_protocol, st_src, st_dest, - netdev, trans_csum ); - } - - free_iob ( iobuf ); - return -EAFNOSUPPORT; -} - -/** - * Determine transmitting network device - * - * @v st_dest Destination address - * @ret netdev Network device, or NULL - */ -struct net_device * tcpip_netdev ( struct sockaddr_tcpip *st_dest ) { - struct tcpip_net_protocol *tcpip_net; - - /* Hand off to the appropriate network-layer protocol */ - tcpip_net = tcpip_net_protocol ( st_dest ); - if ( tcpip_net ) - return tcpip_net->netdev ( st_dest ); - - return NULL; -} - -/** - * Determine maximum transmission unit - * - * @v st_dest Destination address - * @ret mtu Maximum transmission unit - */ -size_t tcpip_mtu ( struct sockaddr_tcpip *st_dest ) { - struct tcpip_net_protocol *tcpip_net; - struct net_device *netdev; - size_t mtu; - - /* Find appropriate network-layer protocol */ - tcpip_net = tcpip_net_protocol ( st_dest ); - if ( ! tcpip_net ) - return 0; - - /* Find transmitting network device */ - netdev = tcpip_net->netdev ( st_dest ); - if ( ! netdev ) - return 0; - - /* Calculate MTU */ - mtu = ( netdev->max_pkt_len - netdev->ll_protocol->ll_header_len - - tcpip_net->header_len ); - - return mtu; -} - -/** - * 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 generic_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 ); -} - -/** - * Bind to local TCP/IP port - * - * @v st_local Local TCP/IP socket address, or NULL - * @v available Function to check port availability - * @ret port Local port number, or negative error - */ -int tcpip_bind ( struct sockaddr_tcpip *st_local, - int ( * available ) ( int port ) ) { - uint16_t flags = 0; - uint16_t try_port = 0; - uint16_t min_port; - uint16_t max_port; - unsigned int offset; - unsigned int i; - - /* Extract parameters from local socket address */ - if ( st_local ) { - flags = st_local->st_flags; - try_port = ntohs ( st_local->st_port ); - } - - /* If an explicit port is specified, check its availability */ - if ( try_port ) - return available ( try_port ); - - /* Otherwise, find an available port in the range [1,1023] or - * [1025,65535] as appropriate. - */ - min_port = ( ( ( ~flags ) & TCPIP_BIND_PRIVILEGED ) + 1 ); - max_port = ( ( flags & TCPIP_BIND_PRIVILEGED ) - 1 ); - offset = random(); - for ( i = 0 ; i <= max_port ; i++ ) { - try_port = ( ( i + offset ) & max_port ); - if ( try_port < min_port ) - continue; - if ( available ( try_port ) < 0 ) - continue; - return try_port; - } - return -EADDRINUSE; -} |