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ip6_randomflowlabel: Avoid blocking if random(4) is not available

Description

ip6_randomflowlabel: Avoid blocking if random(4) is not available

If kern.random.initial_seeding.bypass_before_seeding is disabled, random(4)
and arc4random(9) will block indefinitely until enough entropy is available
to initially seed Fortuna.

It seems that zero flowids are perfectly valid, so avoid blocking on random
until initial seeding takes place.

Discussed with: bz (earlier revision)
Reviewed by: thj
Sponsored by: Dell EMC Isilon
Differential Revision: https://reviews.freebsd.org/D20011

Details

Committed
cemApr 23 2019, 5:18 PM
Reviewer
thj
Differential Revision
D20011: ip6_randomflowlabel: Avoid blocking if random(4) is not available
Parents
rS346600: [PPC64] Fix wrong KASSERT in mphyp_pte_insert()
Branches
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Tags
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