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[tcpip] Provide tcpip_mtu() to determine the maximum transmission unit

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Provide the function tcpip_mtu() to allow external code to determine
the (transport-layer) maximum transmission unit for a given socket
address.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2014-03-04 13:10:07 +00:00
parent db67de6f31
commit 6414b5ca03
4 changed files with 34 additions and 0 deletions
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3
src/include/ipxe/tcpip.h
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@@ -97,6 +97,8 @@ struct tcpip_net_protocol {
const char *name;
/** Network address family */
sa_family_t sa_family;
/** Fixed header length */
size_t header_len;
/**
* Transmit packet
*
@@ -148,6 +150,7 @@ extern int tcpip_tx ( struct io_buffer *iobuf, struct tcpip_protocol *tcpip,
struct net_device *netdev,
uint16_t *trans_csum );
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 );