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svn:author
V 9
vmaffione
K 8
svn:date
V 27
2018-12-04T07:30:02.101582Z
K 7
svn:log
V 359
MFC r340325

netmap: pkt-gen: several updates from upstream

Various improvements to the netmap pkt-gen program:

 - indentation fixes
 - support for IPV6
 - fixes to checksum computation
 - support for NS_MOREFRAG
 - rate limiting in ping mode

Reviewed by:    bcr, 0mp
Approved by:    gnn (mentor)
Differential Revision:  https://reviews.freebsd.org/D17698

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