[issue1862] Multicast needs to be made MPSAFE without mp_lock

New submission from Edward O'Callaghan <[e-mail]>:

See http://bugs.dragonflybsd.org/issue1856 for background.

ip_output() needs to properly locked or rewritten it looks very messy.

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messages: 9037
nosy: eocallaghan
priority: bug
status: unread
title: Multicast needs to be made MPSAFE without mp_lock

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