Angus Gratton 04a2cefb26 lwip: Enable IPV6_ONLY option for UDP sockets (BSD & netconn) ... * setsockopt(s, IPV6_ONLY, &one, sizeof(int)) will disable IPV6-only mode. Incoming/outgoing IPV4 packets are dropped. * Otherwise, sockets bound to IPV6_ANY_ADDR can receive unicast packets for IPV4 or IPV6. * sendto() a IPV6-mapped-IPV4 address on a UDP socket works correctly (not supported for RAW or TCP sockets.) * getaddrinfo() option AI_V4MAPPED is implemented. As well as extending support to TCP & RAW, there is some potential improvement to dropping incoming packets - the drop happens a bit late in the process and there is no "ICMP port unreachable" response sent.		2017-10-02 10:50:27 +11:00
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lwip	lwip: Enable IPV6_ONLY option for UDP sockets (BSD & netconn)	2017-10-02 10:50:27 +11:00