fixed to compile on RHEL 7 based kernels

[pmcgleenon]

the 3.13 kernel version checks aren't sufficient for the NF callback API for RHEL7 based kernels (hooknum is now a const struct nf_hook_ops) rather than int

RHEL7 and later advertises a kernel version 3.10, which has the later version of the NF callback. the vanilla kernel introduced this later than 3.13.

I'm assuming the RHEL clones like CentOS, Oracle, Scientific Linux etc will have the same issue

[pmcgleenon]

RHEL7_NF_BACKPORT is defined in kipfw/Makefile

compiles fine for me on RHEL 7.1. a further patch is needed for RHEL 7.2 - the NF hook API has changed there too

[FS1360472174]

@pmcgleenon
you have added the condition RHEL7.but still got error about the define of call_ipfw.
which call at ipfw2_mod.c line 848.
I test on linux-3.10.0-327.4.5.el7.so how to fix it?

[pmcgleenon]

So it looks like you've got the RHEL 7.2 kernel version. RHEL 7.2 introduced a further change in the NF Hook API. We'll need to make a change similar to #6 for RH7.2

[FS1360472174]

@pmcgleenon I have fixed the issue for RH7.2.
actually I dislike adding so many linux version condition on Hook type define.
we need to note that.as I mention at #13