mirror of https://github.com/hak5/openwrt-owl.git
precompile ppp active filter (reduces libpcap overhead to only a few k), enable by default to support proper demand dialling, fixes #307
SVN-Revision: 3401owl
Felix Fietkau
parent
e7125b2ef0
commit
d568955809
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@ -10,8 +10,7 @@ config BR2_PACKAGE_PPP
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config BR2_PACKAGE_PPP_WITH_FILTER
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prompt "Enable filter support"
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bool
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default n
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depends BR2_PACKAGE_LIBPCAP
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default y
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config BR2_PACKAGE_PPP_MOD_PPPOA
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prompt "ppp-mod-pppoa................... PPPoA (PPP over ATM) plugin"
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@ -41,8 +41,7 @@ $(eval $(call PKG_mod_template,PPP_MOD_RADIUS,radius))
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PKG_DEPEND:="kmod-ppp"
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ifeq ($(BR2_PACKAGE_PPP_WITH_FILTER),y)
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ENABLE_FILTER:="FILTER=1"
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PKG_DEPEND += ", libpcap"
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ENABLE_FILTER:="PRECOMPILED_FILTER=1"
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endif
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$(PKG_BUILD_DIR)/.configured:
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@ -85,11 +84,16 @@ $(PKG_BUILD_DIR)/.built:
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all install
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touch $@
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ifeq ($(BR2_PACKAGE_PPP_WITH_FILTER),y)
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INSTALL_FILTER=install -m0644 ./files/etc/ppp/filter $(IDIR_PPP)/etc/ppp/
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endif
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$(IPKG_PPP):
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install -d -m0755 $(IDIR_PPP)/etc/ppp
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ln -sf /tmp/resolv.conf $(IDIR_PPP)/etc/ppp/resolv.conf
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install -m0600 ./files/etc/ppp/chap-secrets $(IDIR_PPP)/etc/ppp/
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install -m0644 ./files/etc/ppp/options $(IDIR_PPP)/etc/ppp/
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$(INSTALL_FILTER)
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install -m0755 ./files/etc/ppp/ip-up $(IDIR_PPP)/etc/ppp/
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install -m0755 ./files/etc/ppp/ip-down $(IDIR_PPP)/etc/ppp/
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install -d -m0755 $(IDIR_PPP)/usr/sbin
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@ -0,0 +1,23 @@
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#
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# Expression: outbound and not icmp[0] != 8 and not tcp[13] & 4 != 0
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#
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19
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48 0 0 0
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21 0 16 1
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40 0 0 2
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21 0 13 33
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48 0 0 13
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21 0 5 1
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40 0 0 10
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69 9 0 8191
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177 0 0 4
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80 0 0 4
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21 6 7 8
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21 0 5 6
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40 0 0 10
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69 3 0 8191
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177 0 0 4
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80 0 0 17
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69 1 0 4
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6 0 0 4
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6 0 0 0
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@ -25,6 +25,7 @@ case "$DEMAND" in
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on|1|enabled)
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DEMAND=$(nvram get ppp_idletime)
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DEMAND=${IDLETIME:+demand idle $IDLETIME}
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[ -f /etc/ppp/filter ] && DEMAND=${DEMAND:+precompiled-active-filter /etc/ppp/filter $DEMAND}
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;;
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*) DEMAND="persist";;
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esac
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@ -24,6 +24,7 @@ case "$DEMAND" in
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on|1|enabled)
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DEMAND=$(nvram get ppp_idletime)
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DEMAND=${IDLETIME:+demand idle $IDLETIME}
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[ -f /etc/ppp/filter ] && DEMAND=${DEMAND:+precompiled-active-filter /etc/ppp/filter $DEMAND}
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;;
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*) DEMAND="persist";;
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esac
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@ -0,0 +1,231 @@
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diff -urN ppp.old/pppd/Makefile.linux ppp.dev/pppd/Makefile.linux
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--- ppp.old/pppd/Makefile.linux 2006-03-18 15:58:00.000000000 +0100
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+++ ppp.dev/pppd/Makefile.linux 2006-03-18 16:52:01.000000000 +0100
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@@ -50,6 +50,9 @@
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# and that the kernel driver support PPP packet filtering.
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#FILTER=y
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+# Support for precompiled filters
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+PRECOMPILED_FILTER=y
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+
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# Uncomment the next line to enable multilink PPP (enabled by default)
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# Linux distributions: Please leave multilink ENABLED in your builds
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# of pppd!
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@@ -177,6 +180,14 @@
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endif
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endif
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+ifdef PRECOMPILED_FILTER
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+PPPDSRCS += pcap_pcc.c
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+HEADERS += pcap_pcc.h
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+PPPDOBJS += pcap_pcc.o
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+LIBS += $(STAGING_DIR)/usr/lib/libpcap.a
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+CFLAGS += -DPPP_FILTER -DPPP_PRECOMPILED_FILTER -I$(STAGING_DIR)/usr/include
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+endif
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+
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ifdef HAVE_INET6
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PPPDSRCS += ipv6cp.c eui64.c
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HEADERS += ipv6cp.h eui64.h
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diff -urN ppp.old/pppd/demand.c ppp.dev/pppd/demand.c
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--- ppp.old/pppd/demand.c 2006-03-18 15:58:00.000000000 +0100
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+++ ppp.dev/pppd/demand.c 2006-03-18 18:09:16.000000000 +0100
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@@ -438,12 +438,14 @@
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return 0;
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proto = PPP_PROTOCOL(p);
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#ifdef PPP_FILTER
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+ *p = 1; /* set outbound for the filter rule */
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if (pass_filter.bf_len != 0
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&& bpf_filter(pass_filter.bf_insns, p, len, len) == 0)
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return 0;
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if (active_filter.bf_len != 0
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&& bpf_filter(active_filter.bf_insns, p, len, len) == 0)
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return 0;
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+ *p = 0xff; /* restore original ppp header */
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#endif
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for (i = 0; (protp = protocols[i]) != NULL; ++i) {
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if (protp->protocol < 0xC000 && (protp->protocol & ~0x8000) == proto) {
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diff -urN ppp.old/pppd/options.c ppp.dev/pppd/options.c
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--- ppp.old/pppd/options.c 2006-03-18 15:58:00.000000000 +0100
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+++ ppp.dev/pppd/options.c 2006-03-18 18:05:58.000000000 +0100
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@@ -57,14 +57,7 @@
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#ifdef PPP_FILTER
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#include <pcap.h>
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-/*
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- * DLT_PPP_WITH_DIRECTION is in current libpcap cvs, and should be in
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- * libpcap-0.8.4. Until that is released, use DLT_PPP - but that means
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- * we lose the inbound and outbound qualifiers.
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- */
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-#ifndef DLT_PPP_WITH_DIRECTION
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-#define DLT_PPP_WITH_DIRECTION DLT_PPP
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-#endif
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+#include <pcap-bpf.h>
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#endif
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#include "pppd.h"
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@@ -155,6 +148,13 @@
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static int loadplugin __P((char **));
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#endif
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+#ifdef PPP_PRECOMPILED_FILTER
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+#include "pcap_pcc.h"
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+static int setprecompiledpassfilter __P((char **));
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+static int setprecompiledactivefilter __P((char **));
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+#undef PPP_FILTER
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+#endif
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+
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#ifdef PPP_FILTER
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static int setpassfilter __P((char **));
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static int setactivefilter __P((char **));
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@@ -312,6 +312,14 @@
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"set filter for active pkts", OPT_PRIO },
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#endif
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+#ifdef PPP_PRECOMPILED_FILTER
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+ { "precompiled-pass-filter", 1, setprecompiledpassfilter,
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+ "set precompiled filter for packets to pass", OPT_PRIO },
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+
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+ { "precompiled-active-filter", 1, setprecompiledactivefilter,
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+ "set precompiled filter for active pkts", OPT_PRIO },
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+#endif
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+
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#ifdef MAXOCTETS
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{ "maxoctets", o_int, &maxoctets,
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"Set connection traffic limit",
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@@ -1447,6 +1455,29 @@
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return ok;
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}
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+#ifdef PPP_PRECOMPILED_FILTER
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+/*
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+ * setprecompiledpassfilter - Set the pass filter for packets using a
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+ * precompiled expression
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+ */
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+static int
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+setprecompiledpassfilter(argv)
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+ char **argv;
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+{
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+ return pcap_pre_compiled (*argv, &pass_filter);
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+}
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+
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+/*
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+ * setactivefilter - Set the active filter for packets
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+ */
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+static int
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+setprecompiledactivefilter(argv)
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+ char **argv;
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+{
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+ return pcap_pre_compiled (*argv, &active_filter);
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+}
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+#endif
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+
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#ifdef PPP_FILTER
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/*
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* setpassfilter - Set the pass filter for packets
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@@ -1458,7 +1489,7 @@
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pcap_t *pc;
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int ret = 0;
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- pc = pcap_open_dead(DLT_PPP_WITH_DIRECTION, 65535);
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+ pc = pcap_open_dead(DLT_PPP_PPPD, 65535);
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if (pcap_compile(pc, &pass_filter, *argv, 1, netmask) == -1) {
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option_error("error in pass-filter expression: %s\n",
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pcap_geterr(pc));
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@@ -1479,7 +1510,7 @@
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pcap_t *pc;
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int ret = 0;
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- pc = pcap_open_dead(DLT_PPP_WITH_DIRECTION, 65535);
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+ pc = pcap_open_dead(DLT_PPP_PPPD, 65535);
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if (pcap_compile(pc, &active_filter, *argv, 1, netmask) == -1) {
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option_error("error in active-filter expression: %s\n",
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pcap_geterr(pc));
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diff -urN ppp.old/pppd/pcap_pcc.c ppp.dev/pppd/pcap_pcc.c
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--- ppp.old/pppd/pcap_pcc.c 1970-01-01 01:00:00.000000000 +0100
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+++ ppp.dev/pppd/pcap_pcc.c 2006-03-18 16:51:31.000000000 +0100
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@@ -0,0 +1,74 @@
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+#include <pcap.h>
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+#include <pcap-bpf.h>
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+#include <stdio.h>
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+#include <stdlib.h>
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+#include <string.h>
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+#include <errno.h>
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+#include "pppd.h"
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+
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+int pcap_pre_compiled (char * fname, struct bpf_program *p)
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+{
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+ char buf[128];
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+ int line = 0, size = 0, index=0, ret=1;
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+ FILE *f = fopen (fname, "r");
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+ if (!f)
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+ {
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+ option_error("error opening precompiled active-filter '%s': %s",
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+ fname, strerror (errno));
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+ return 0;
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+ }
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+ while (fgets (buf, 127, f))
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+ {
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+ line++;
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+ if (*buf == '#')
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+ continue;
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+ if (size)
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+ {
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+ /*
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+ struct bpf_insn {
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+ u_short code;
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+ u_char jt;
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+ u_char jf;
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+ bpf_int32 k;
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+ }
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+ */
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+ struct bpf_insn * insn = & p->bf_insns[index];
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+ unsigned code, jt, jf, k;
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+ if (sscanf (buf, "%u %u %u %u", &code, &jt, &jf, &k) != 4)
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+ {
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+ goto err;
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+ }
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+ insn->code = code;
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+ insn->jt = jt;
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+ insn->jf = jf;
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+ insn->k = k;
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+ index++;
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+ }
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+ else
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+ {
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+ if (sscanf (buf, "%u", &size) != 1)
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+ {
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+ goto err;
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+ }
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+ p->bf_len = size;
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+ p->bf_insns = (struct bpf_insn *)
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+ malloc (size * sizeof (struct bpf_insn));
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+ }
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+ }
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+ if (size != index)
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+ {
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+ option_error("error in precompiled active-filter,"
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+ " expected %d expressions, got %dn",
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+ size, index);
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+ ret = 0;
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+ }
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+ fclose(f);
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+ return ret;
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+
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+err:
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+ option_error("error in precompiled active-filter"
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+ " expression line %s:%d (wrong size)\n",
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+ fname, line);
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+ fclose (f);
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+ return 0;
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+}
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diff -urN ppp.old/pppd/pcap_pcc.h ppp.dev/pppd/pcap_pcc.h
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--- ppp.old/pppd/pcap_pcc.h 1970-01-01 01:00:00.000000000 +0100
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+++ ppp.dev/pppd/pcap_pcc.h 2006-03-18 15:59:14.000000000 +0100
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@@ -0,0 +1,7 @@
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+#ifndef PCAP_PCC_H
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+#define PCAP_PCC_H
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+
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+#include <pcap.h>
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+
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+int pcap_pre_compiled (char * fname, struct bpf_program *p);
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+#endif /* PCAP_PCC_H */
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@ -0,0 +1,51 @@
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/*
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* Taken from fli4l 3.0
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* Make sure you compile it against the same libpcap version used in OpenWrt
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*/
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <string.h>
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#include <linux/types.h>
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#include <linux/ppp_defs.h>
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#include <pcap.h>
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#include <pcap-bpf.h>
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int main (int argc, char ** argv)
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{
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pcap_t *pc; /* Fake struct pcap so we can compile expr */
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struct bpf_program filter; /* Filter program for link-active pkts */
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u_int32_t netmask=0;
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int dflag = 3;
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if (argc == 4)
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{
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if (!strcmp (argv[1], "-d"))
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{
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dflag = atoi (argv[2]);
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argv += 2;
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argc -=2;
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}
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}
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if (argc != 2)
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{
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printf ("usage; %s [ -d <debug_level> ] expression\n", argv[0]);
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return 1;
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}
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pc = pcap_open_dead(DLT_PPP_PPPD, PPP_HDRLEN);
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if (pcap_compile(pc, &filter, argv[1], 1, netmask) == 0)
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{
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printf ("#\n# Expression: %s\n#\n", argv[1]);
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bpf_dump (&filter, dflag);
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return 0;
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}
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else
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{
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printf("error in active-filter expression: %s\n", pcap_geterr(pc));
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}
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return 1;
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}
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@ -23,6 +23,7 @@ case "$DEMAND" in
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on|1|enabled)
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DEMAND=$(nvram get ppp_idletime)
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DEMAND=${IDLETIME:+demand idle $IDLETIME}
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[ -f /etc/ppp/filter ] && DEMAND=${DEMAND:+precompiled-active-filter /etc/ppp/filter $DEMAND}
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;;
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*) DEMAND="persist";;
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esac
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