4ac89986fb
With new pfil(9) KPI it is possible to pass a void pointer with length instead of mbuf pointer to a packet filter. Until this commit no filters supported that, so pfil run through a shim function pfil_fake_mbuf(). Now the ipfw(4) hook named "default-link", that is instantiated when net.link.ether.ipfw sysctl is on, supports processing pointer/length packets natively. - ip_fw_args now has union for either mbuf or void *, and if flags have non-zero length, then we use the void *. - through ipfw_chk() we handle mem/mbuf cases differently. - ether_header goes away from args. It is ipfw_chk() responsibility to do parsing of Ethernet header. - ipfw_log() now uses different bpf APIs to log packets. Although ipfw_chk() is now capable to process pointer/length packets, this commit adds support for the link level hook only, see ipfw_check_frame(). Potentially the IP processing hook ipfw_check_packet() can be improved too, but that requires more changes since the hook supports more complex actions: NAT, divert, etc. Reviewed by: ae Differential Revision: https://reviews.freebsd.org/D19357
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