Update sockbuf.hcopy from file "freebsd/sys/sockbuf.h"
Update socketvar.hcopy from file "freebsd/sys/socketvar.h"
ff tools upgrade to support FreeBSD 13.0.
Update LICENCE.
Support DPDK 20.11.0(LTS).
Fix some issues of ff msg.
Fix bug of ff_ipc_msg_free in ff tools.The ff msg shouldn't to free while `ff_ipc_send` success but `ff_ipc_recv` failed (such as F-Stack app are breaking by gdb).
Fix bug of `sysctl` in tools/compat/sysctl.c.The ff msg shouldn't to free while `ff_ipc_send` success but `ff_ipc_recv` failed (such as F-Stack app are breaking by gdb).
feature: add ndp tool for ipv6 neighbor
Merge pull request #551 from philberty/devWhen compiling with GCC we hit compilation error of taking address of packed member.