[Bug 254623] traceroute6: ICMP6 does not work anymore

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254623

--- Comment #3 from Zhenlei Huang <zlei.huang at gmail.com> ---
The review D25604 capsicumize traceroute6, and use connect / send instead of
sendto. For ICMPV6 there may be ICMP6_DST_UNREACH type packets from
intermediate gateways, and they will not be captured by the pre-connected
socket IIUC.

Here comes the solution, let's separate the connected socket (sndsock) from
receive socket (rcvsock) as same as UDP / TCP / SCTP routines.

CC Mariusz Zaborski

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