Commits on Sep 6, 2021

1. Add support for IP_RECVERR and IPV6_RECVERR …

   Setting these options enables receiving errors, such as ICMP errors from
   the network, via `recvmsg()` with `MSG_ERRQUEUE`.
   
   Adds new `Ipv{4,6}RecvErr` variants to `ControlMessageOwned`.  These
   control messages are produced when `Ipv4RecvErr` or `Ipv6RecvErr`
   options are enabled on a raw or datagram socket.
   
   New tests for the functionality can be run with `cargo test --test test
   test_recverr`.
   
   This commit builds on an earlier draft of the functionality authored by
   Matthew McPherrin <git@mcpherrin.ca>.

   

   cemeyer committed Sep 6, 2021
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