diff options
Diffstat (limited to 'roms/ipxe/src/include/ipxe/tcpip.h')
| -rw-r--r-- | roms/ipxe/src/include/ipxe/tcpip.h | 54 |
1 files changed, 11 insertions, 43 deletions
diff --git a/roms/ipxe/src/include/ipxe/tcpip.h b/roms/ipxe/src/include/ipxe/tcpip.h index 414daad53..3cfc8e3ac 100644 --- a/roms/ipxe/src/include/ipxe/tcpip.h +++ b/roms/ipxe/src/include/ipxe/tcpip.h @@ -13,48 +13,17 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); #include <ipxe/socket.h> #include <ipxe/in.h> #include <ipxe/tables.h> - -extern uint16_t generic_tcpip_continue_chksum ( uint16_t partial, - const void *data, size_t len ); - #include <bits/tcpip.h> struct io_buffer; struct net_device; struct ip_statistics; -/** Positive zero checksum value */ -#define TCPIP_POSITIVE_ZERO_CSUM 0x0000 - -/** Negative zero checksum value */ -#define TCPIP_NEGATIVE_ZERO_CSUM 0xffff - /** Empty checksum value * - * All of our TCP/IP checksum algorithms will return only the positive - * representation of zero (0x0000) for a zero checksum over non-zero - * input data. This property arises since the end-around carry used - * to mimic one's complement addition using unsigned arithmetic - * prevents the running total from ever returning to 0x0000. The - * running total will therefore use only the negative representation - * of zero (0xffff). Since the return value is the one's complement - * negation of the running total (calculated by simply bit-inverting - * the running total), the return value will therefore use only the - * positive representation of zero (0x0000). - * - * It is a very common misconception (found in many places such as - * RFC1624) that this is a property guaranteed by the underlying - * mathematics. It is not; the choice of which zero representation is - * used is merely an artifact of the software implementation of the - * checksum algorithm. - * - * For consistency, we choose to use the positive representation of - * zero (0x0000) for the checksum of a zero-length block of data. - * This ensures that all of our TCP/IP checksum algorithms will return - * only the positive representation of zero (0x0000) for a zero - * checksum (regardless of the input data). + * This is the TCP/IP checksum over a zero-length block of data. */ -#define TCPIP_EMPTY_CSUM TCPIP_POSITIVE_ZERO_CSUM +#define TCPIP_EMPTY_CSUM 0xffff /** TCP/IP address flags */ enum tcpip_st_flags { @@ -119,13 +88,6 @@ struct tcpip_protocol { int ( * rx ) ( struct io_buffer *iobuf, struct net_device *netdev, struct sockaddr_tcpip *st_src, struct sockaddr_tcpip *st_dest, uint16_t pshdr_csum ); - /** Preferred zero checksum value - * - * The checksum is a one's complement value: zero may be - * represented by either positive zero (0x0000) or negative - * zero (0xffff). - */ - uint16_t zero_csum; /** * Transport-layer protocol number * @@ -144,8 +106,6 @@ struct tcpip_net_protocol { sa_family_t sa_family; /** Fixed header length */ size_t header_len; - /** Network-layer protocol */ - struct net_protocol *net_protocol; /** * Transmit packet * @@ -196,11 +156,19 @@ extern int tcpip_tx ( struct io_buffer *iobuf, struct tcpip_protocol *tcpip, struct sockaddr_tcpip *st_dest, struct net_device *netdev, uint16_t *trans_csum ); -extern struct tcpip_net_protocol * tcpip_net_protocol ( sa_family_t sa_family ); extern struct net_device * tcpip_netdev ( struct sockaddr_tcpip *st_dest ); extern size_t tcpip_mtu ( struct sockaddr_tcpip *st_dest ); +extern uint16_t generic_tcpip_continue_chksum ( uint16_t partial, + const void *data, size_t len ); extern uint16_t tcpip_chksum ( const void *data, size_t len ); extern int tcpip_bind ( struct sockaddr_tcpip *st_local, int ( * available ) ( int port ) ); +/* Use generic_tcpip_continue_chksum() if no architecture-specific + * version is available + */ +#ifndef tcpip_continue_chksum +#define tcpip_continue_chksum generic_tcpip_continue_chksum +#endif + #endif /* _IPXE_TCPIP_H */ |