Comments (2)
chrysn
commented on August 9, 2024
It seems that even when using recvmsg (which is implemented since bde8c42), the IPV6_RECVERR sockopt and the MSG_ERRQUEUE recvmsg flag only work with connected UDP sockets. (ip(7) says so, ipv6(7) referred to the former, and a quick test confirmed it).
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chrysn
commented on August 9, 2024
Not sure what was wrong with my previous test, but RECVERR does work on unconnected sockets. (As for documentation, I misread the paragraph on raw sockets). With the right socket options (IPV6/IPV6_REVERR=1, IP/IP_RECVERR=1), errors from both IPv4 and IPv6 come back on a hybrid socket.
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