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udp: use netif addr as src for multicast sockets

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Sockets bound to a multicast address could not transmit multicast
packets because the pcb local address did not match the netif address
even if the outgoing netif was resolved correctly.

To correct the issue, pcbs with a multicast local address will use
the outgoing netif address as the source address in IPv4.
This commit is contained in:
Joel Cunningham 2016-03-17 14:38:14 -05:00
parent 87354abf0f
commit 8ac1b4825a
1 changed files with 4 additions and 2 deletions
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6
src/core/udp.c
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@ -649,8 +649,10 @@ udp_sendto_if_chksum(struct udp_pcb *pcb, struct pbuf *p, const ip_addr_t *dst_i
else
#endif /* LWIP_IPV4 && LWIP_IPV6 */
#if LWIP_IPV4
if (ip4_addr_isany(ip_2_ip4(&pcb->local_ip))) {
/* use outgoing network interface IP address as source address */
if (ip4_addr_isany(ip_2_ip4(&pcb->local_ip)) ||
ip4_addr_ismulticast(ip_2_ip4(&pcb->local_ip))) {
/* if the local_ip is any or multicast
* use the outgoing network interface IP address as source address */
src_ip = netif_ip_addr4(netif);
} else {
/* check if UDP PCB local IP address is correct