[Bug 1067] New: Compilation failure on Linux 4.5.x when including libiptc/libiptc.h

[bugzilla-daemon at netfilter.org]

https://bugzilla.netfilter.org/show_bug.cgi?id=1067

            Bug ID: 1067
           Summary: Compilation failure on Linux 4.5.x when including
                    libiptc/libiptc.h
           Product: iptables
           Version: 1.4.x
          Hardware: x86_64
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: iptables
          Assignee: netfilter-buglog at lists.netfilter.org
          Reporter: quentin at armitage.org.uk

Including <libiptc/libiptc.h> causes a compilation failure with multiple
messages like:

In file included from /usr/include/linux/netfilter_ipv4/ip_tables.h:20:0,
                 from /usr/include/libiptc/libiptc.h:12,
                 from /tmp/inc.c:1:
/usr/include/linux/if.h:71:2: error: redeclaration of enumerator ‘IFF_UP’
In file included from /usr/include/libiptc/ipt_kernel_headers.h:14:0,
                 from /usr/include/libiptc/libiptc.h:6,
                 from /tmp/inc.c:1:
/usr/include/net/if.h:44:5: note: previous definition of ‘IFF_UP’ was here

Kernel patch 1ffad83dffd675cd742286ae82dca7d746cb0da8 appears to have caused
the problem, by including <linux/if.h>, which has multiple namespace collisions
with <net/if.h>.

<libiptc/libiptc.h> includes <libiptc/ipt_kernel_headers.h> and also
<linux/netfilter_ipv4/ip_tables.h>.

<libiptc/ipt_kernel_headers.h> includes <net/if.h>, and since the above kernel
patch, <linux/netfilter_ipv4/ip_tables.h> includes <linux.if.h>.

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