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Fixes IPv6 multicast join issue 

Problem Statement:
During multicast join sequence, InternetSocket::join_multicast_group() calls InternetSocket::modify_multicast_group(). modify_multicast_group() sets up the multicast group address (i.e., mreq.imr_multiaddr) to be joined and the interface address (i.e., mreq.imr_interface) to be used for the multicast join request. The interface address is initialized with the default value, which sets the version of interface address to NSAPI_UNSPEC. This results in LWIP::setsockopt() API to attempt IPv6 multicast join on the IPv4 interface address, hence IPv6 multicast join always fails with the protocol error.

Fix:
Initialize interface address version based on the multicast address version in LWIP::setsockopt(), before attempting multicast join operation.
pull/11667/head
Sathish Kumar Mani 2019-10-10 17:55:33 +05:30
parent 1798c246cc
commit 5b791a4345
1 changed files with 3 additions and 2 deletions
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5
features/lwipstack/LWIPStack.cpp
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@ -560,13 +560,14 @@ nsapi_error_t LWIP::setsockopt(nsapi_socket_t handle, int level, int optname, co
return NSAPI_ERROR_PARAMETER;
}
/* Convert the interface address, or make sure it's the correct sort of "any" */
if (imr->imr_interface.version != NSAPI_UNSPEC) {
/* Convert the interface address */
if (!convert_mbed_addr_to_lwip(&if_addr, &imr->imr_interface)) {
return NSAPI_ERROR_PARAMETER;
}
} else {
ip_addr_set_any(IP_IS_V6(&if_addr), &if_addr);
/* Set interface address to "any", matching the group address type */
ip_addr_set_any(IP_IS_V6(&multi_addr), &if_addr);
}
igmp_err = ERR_USE; // Maps to NSAPI_ERROR_UNSUPPORTED