Content is rather sparse, but still better than no manpage at all.
Cc: Willem de Bruijn <willemb@xxxxxxxxxx>
Signed-off-by: Phil Sutter <phil@xxxxxx>
---
configure.ac | 3 +-
utils/.gitignore | 1 +
utils/Makefile.am | 3 +-
utils/nfbpf_compile.8.in | 70 ++++++++++++++++++++++++++++++++++++++++
4 files changed, 75 insertions(+), 2 deletions(-)
create mode 100644 utils/nfbpf_compile.8.in
diff --git a/configure.ac b/configure.ac
index 448ec918fd89b..e6c9832fa43ba 100644
--- a/configure.ac
+++ b/configure.ac
@@ -252,7 +252,8 @@ AC_CONFIG_FILES([Makefile extensions/GNUmakefile include/Makefile
libxtables/Makefile utils/Makefile
include/xtables-version.h include/iptables/internal.h
iptables/xtables-monitor.8
- utils/nfnl_osf.8])
+ utils/nfnl_osf.8
+ utils/nfbpf_compile.8])
AC_OUTPUT
diff --git a/utils/.gitignore b/utils/.gitignore
index 7c6afbf4e6a52..6300812b1701b 100644
--- a/utils/.gitignore
+++ b/utils/.gitignore
@@ -1,3 +1,4 @@
/nfnl_osf
/nfnl_osf.8
/nfbpf_compile
+/nfbpf_compile.8
diff --git a/utils/Makefile.am b/utils/Makefile.am
index 80029e303ff3b..d09a69749b85f 100644
--- a/utils/Makefile.am
+++ b/utils/Makefile.am
@@ -17,6 +17,7 @@ nfnl_osf_LDADD = ${libnfnetlink_LIBS}
endif
if ENABLE_BPFC
+man_MANS += nfbpf_compile.8
sbin_PROGRAMS += nfbpf_compile
nfbpf_compile_LDADD = -lpcap
endif
@@ -26,4 +27,4 @@ sbin_PROGRAMS += nfsynproxy
nfsynproxy_LDADD = -lpcap
endif
-CLEANFILES = nfnl_osf.8
+CLEANFILES = nfnl_osf.8 nfbpf_compile.8
diff --git a/utils/nfbpf_compile.8.in b/utils/nfbpf_compile.8.in
new file mode 100644
index 0000000000000..d02979a5143ef
--- /dev/null
+++ b/utils/nfbpf_compile.8.in
@@ -0,0 +1,70 @@
+.TH NFBPF_COMPILE 8 "" "@PACKAGE_STRING@" "@PACKAGE_STRING@"
+
+.SH NAME
+nfbpf_compile \- generate bytecode for use with xt_bpf
+.SH SYNOPSIS
+
+.ad l
+.in +8
+.ti -8
+.B nfbpf_compile
+[
+.I LLTYPE
+]
+.I PROGRAM
+
+.ti -8
+.I LLTYPE
+:= {
+.BR EN10MB " | " RAW " | " SLIP " | "
+.I ...
+}
+
+.SH DESCRIPTION
+The
+.B nfbpf_compile
+utility aids in generating BPF byte code suitable for passing to
+the iptables
+.B bpf
+match.
+
+.SH OPTIONS
+
+.TP
+.I LLTYPE
+Link-layer header type to operate on. This is a name as defined in
+.RB < pcap/dlt.h >
+but with the leading
+.B DLT_
+prefix stripped. For use with iptables,
+.B RAW
+should be the right choice (it's also the default if not specified).
+
+.TP
+.I PROGRAM
+The BPF expression to compile, see
+.BR pcap-filter (7)
+for a description of the language.
+
+.SH EXIT STATUS
+The program returns 0 on success, 1 otherwise.
+
+.SH EXAMPLE
+Match incoming TCP packets with size bigger than 100 bytes:
+.P
+.in +8
+.EE
+bpf=$(nfbpf_compile 'tcp and greater 100')
+.br
+iptables -A INPUT -m bpf --bytecode "$bpf" -j ACCEPT
+.RE
+.P
+The description of
+.B bpf
+match in
+.BR iptables-extensions (8)
+lists a few more examples.
+
+.SH SEE ALSO
+.BR iptables-extensions (8),
+.BR pcap-filter (7)
--
2.20.1
