I'm using lwip 1.3.0 and I'm using it in raw mode (as provided in Xilinx EDK
11.1/11.4 - I had to change a .tcl script though to include igmp.c).
Using the code below I can see an IGMP join message exit my device and enter
the switch its plugged into, but the router in charge of IGMP does not
subsequently list my device/interface as being subscribed to the multicast
group 239.253.1.1. The IGMP join message it sends out also has a lot of
trailing zeros that I don't see when I issue a similar IGMP join from my
workstation (OS X 10.6), and also unlike my workstation and other desktops at
work, lwIP sends out a single IGMP join, and all other device send 2 or 3 (any
idea why?). Also, whenever the IGMP Membership Query message is sent out, my
device does not re-issue a join to 239.253.1.1. Did I do something wrong? Below
is the code.
int main() {
struct netif *netif, server_netif;
struct ip_addr ipaddr, netmask, gw, ipgroup;
unsigned char mac_ethernet_address[] = { /* REDACTED */ };
err_t igmp_result;
netif = &server_netif;
init_platform();
/* initliaze IP addresses to be used */
IP4_ADDR( &ipaddr, 10, 10, 12, 58 );
IP4_ADDR( &gw, 10, 10, 12, 254 );
IP4_ADDR( &netmask, 255, 255, 255, 0 );
IP4_ADDR( &ipgroup, 239, 253, 1, 1 );
print_ip_settings(&ipaddr, &netmask, &gw);
lwip_init();
netif->flags |= NETIF_FLAG_IGMP; // This has no effect as netif->flags
is zeroed by netif_add when called in xemac_add...
// but netif has conditional statements based on the value... so I'm confused.
/* Add network interface to the netif_list, and set it as default */
if (!xemac_add(netif, &ipaddr, &netmask, &gw, mac_ethernet_address,
PLATFORM_EMAC_BASEADDR)) {
xil_printf("Error adding N/W interface\n\r");
return -1;
}
netif_set_default(netif);
/* now enable interrupts */
platform_enable_interrupts();
/* specify that the network if is up */
netif_set_up( netif );
/* start the application (web server, rxtest, txtest, etc..) */
udp_echo_init();
netif->flags |= NETIF_FLAG_IGMP;
igmp_result = igmp_start( netif );
igmp_result = igmp_joingroup( &ipaddr, &ipgroup );
/* receive and process packets */
while (1) {
xemacif_input(netif);
//transfer_data();
}
/* never reached */
cleanup_platform();
return 0;
}
Also, xemac_add calls netif_add, and within which there is the following code:
netif->flags = 0;
// ...
#if LWIP_IGMP
/* start IGMP processing */
if (netif->flags & NETIF_FLAG_IGMP) {
igmp_start( netif);
}
#endif /* LWIP_IGMP */
How does igmp_start ever get called? I don't see any code in the file (where I
write //... above) that could reset the flag to include NETIF_FLAG_IGMP.
Thanks!
Jonathan
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