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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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src/net/ipv4.c
+8 -1
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@@ -286,6 +286,7 @@ static int ipv4_ll_addr ( struct in_addr dest, struct in_addr src,
*
* @v iobuf I/O buffer
* @v tcpip Transport-layer protocol
* @v st_src Source network-layer address
* @v st_dest Destination network-layer address
* @v netdev Network device to use if no route found, or NULL
* @v trans_csum Transport-layer checksum to complete, or NULL
@@ -295,10 +296,12 @@ static int ipv4_ll_addr ( struct in_addr dest, struct in_addr src,
*/
static int ipv4_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 iphdr *iphdr = iob_push ( iobuf, sizeof ( *iphdr ) );
struct sockaddr_in *sin_src = ( ( struct sockaddr_in * ) st_src );
struct sockaddr_in *sin_dest = ( ( struct sockaddr_in * ) st_dest );
struct ipv4_miniroute *miniroute;
struct in_addr next_hop;
@@ -317,7 +320,11 @@ static int ipv4_tx ( struct io_buffer *iobuf,
/* Use routing table to identify next hop and transmitting netdev */
next_hop = iphdr->dest;
if ( ( miniroute = ipv4_route ( &next_hop ) ) ) {
if ( sin_src )
iphdr->src = sin_src->sin_addr;
if ( ( next_hop.s_addr != INADDR_BROADCAST ) &&
( ! IN_MULTICAST ( ntohl ( next_hop.s_addr ) ) ) &&
( ( miniroute = ipv4_route ( &next_hop ) ) != NULL ) ) {
iphdr->src = miniroute->address;
netdev = miniroute->netdev;
}