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The set_dscp() function, until now, tried to set the DSCP as IPv4 and as IPv6. This worked OK on Linux, where an ENOPROTOOPT error made it really clear which one was wrong, but FreeBSD uses EINVAL instead, which has multiple meanings and which it therefore seems somewhat risky to ignore. Instead, this commit just tries to set the correct address family's DSCP option. Tested by Alex Wang on FreeBSD 9.3. Reported-by: Atanu Ghosh <atanu@acm.org> Signed-off-by: Ben Pfaff <blp@nicira.com> Co-authored-by: Alex Wang <alexw@nicira.com> Signed-off-by: Alex Wang <alexw@nicira.com> Tested-by: Alex Wang <alexw@nicira.com>