[Bug 196631] [PATCH] fix for IPv4 bitmasking in src/sys/ofed/include/ip.h

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=196631

            Bug ID: 196631
           Summary: [PATCH] fix for IPv4 bitmasking in
                    src/sys/ofed/include/ip.h
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: ngie at FreeBSD.org

The bitmask operation on buf[16]in ip_ib_mc_map(..) whacks the upper nibble,
which in turn causes IB to not talk on all multicast groups.

The attached patch fixes that.

Submitted by: Jeff Meeghan <jeff.mehgan at isilon.com>

Environment:
FreeBSD 11.0-CURRENT

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