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[tcpip] Allow for transmission to multicast IPv4 addresses

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When sending to a multicast address, it may be necessary to specify
the source address explicitly, since the multicast destination address
does not provide enough information to deduce the source address via
the miniroute table.

Allow the source address specified via the data-xfer metadata to be
passed down through the TCP/IP stack to the IPv4 layer, which can use
it as a default source address.
This commit is contained in:
Michael Brown
2009-01-21 03:40:39 +00:00
parent b4a95a8974
commit d230b53df2
7 changed files with 29 additions and 20 deletions
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5
src/include/gpxe/tcpip.h
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@@ -82,6 +82,7 @@ struct tcpip_net_protocol {
*
* @v iobuf I/O buffer
* @v tcpip_protocol Transport-layer protocol
* @v st_src Source address, or NULL to use default
* @v st_dest Destination address
* @v netdev Network device (or NULL to route automatically)
* @v trans_csum Transport-layer checksum to complete, or NULL
@@ -91,6 +92,7 @@ struct tcpip_net_protocol {
*/
int ( * 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 );
@@ -107,7 +109,8 @@ struct tcpip_net_protocol {
extern 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 );
extern int tcpip_tx ( struct io_buffer *iobuf, struct tcpip_protocol *tcpip,
extern int tcpip_tx ( struct io_buffer *iobuf, struct tcpip_protocol *tcpip,
struct sockaddr_tcpip *st_src,
struct sockaddr_tcpip *st_dest,
struct net_device *netdev,
uint16_t *trans_csum );