Index: ppp-2.4.3/pppd/Makefile.linux
===================================================================
--- ppp-2.4.3.orig/pppd/Makefile.linux	2007-06-04 13:22:14.133706632 +0200
+++ ppp-2.4.3/pppd/Makefile.linux	2007-06-04 13:22:14.320678208 +0200
@@ -50,6 +50,9 @@
 # and that the kernel driver support PPP packet filtering.
 #FILTER=y
 
+# Support for precompiled filters
+PRECOMPILED_FILTER=y
+
 # Uncomment the next line to enable multilink PPP (enabled by default)
 # Linux distributions: Please leave multilink ENABLED in your builds
 # of pppd!
@@ -177,6 +180,14 @@
 endif
 endif
 
+ifdef PRECOMPILED_FILTER
+PPPDSRCS += pcap_pcc.c
+HEADERS  += pcap_pcc.h
+PPPDOBJS += pcap_pcc.o
+LIBS	+= $(STAGING_DIR)/usr/lib/libpcap.a
+CFLAGS	+= -DPPP_FILTER -DPPP_PRECOMPILED_FILTER -I$(STAGING_DIR)/usr/include
+endif
+
 ifdef HAVE_INET6
      PPPDSRCS += ipv6cp.c eui64.c
      HEADERS  += ipv6cp.h eui64.h
Index: ppp-2.4.3/pppd/demand.c
===================================================================
--- ppp-2.4.3.orig/pppd/demand.c	2007-06-04 13:22:11.613089824 +0200
+++ ppp-2.4.3/pppd/demand.c	2007-06-04 13:22:14.320678208 +0200
@@ -438,12 +438,14 @@
 	return 0;
     proto = PPP_PROTOCOL(p);
 #ifdef PPP_FILTER
+	*p = 1; /* set outbound for the filter rule */
     if (pass_filter.bf_len != 0
 	&& bpf_filter(pass_filter.bf_insns, p, len, len) == 0)
 	return 0;
     if (active_filter.bf_len != 0
 	&& bpf_filter(active_filter.bf_insns, p, len, len) == 0)
 	return 0;
+	*p = 0xff; /* restore original ppp header */
 #endif
     for (i = 0; (protp = protocols[i]) != NULL; ++i) {
 	if (protp->protocol < 0xC000 && (protp->protocol & ~0x8000) == proto) {
Index: ppp-2.4.3/pppd/options.c
===================================================================
--- ppp-2.4.3.orig/pppd/options.c	2007-06-04 13:22:09.005486240 +0200
+++ ppp-2.4.3/pppd/options.c	2007-06-04 13:22:14.321678056 +0200
@@ -57,14 +57,7 @@
 
 #ifdef PPP_FILTER
 #include <pcap.h>
-/*
- * DLT_PPP_WITH_DIRECTION is in current libpcap cvs, and should be in
- * libpcap-0.8.4.  Until that is released, use DLT_PPP - but that means
- * we lose the inbound and outbound qualifiers.
- */
-#ifndef DLT_PPP_WITH_DIRECTION
-#define DLT_PPP_WITH_DIRECTION	DLT_PPP
-#endif
+#include <pcap-bpf.h>
 #endif
 
 #include "pppd.h"
@@ -155,6 +148,13 @@
 static int loadplugin __P((char **));
 #endif
 
+#ifdef PPP_PRECOMPILED_FILTER
+#include "pcap_pcc.h"
+static int setprecompiledpassfilter __P((char **));
+static int setprecompiledactivefilter __P((char **));
+#undef PPP_FILTER
+#endif
+
 #ifdef PPP_FILTER
 static int setpassfilter __P((char **));
 static int setactivefilter __P((char **));
@@ -312,6 +312,14 @@
       "set filter for active pkts", OPT_PRIO },
 #endif
 
+#ifdef PPP_PRECOMPILED_FILTER
+    { "precompiled-pass-filter", 1, setprecompiledpassfilter,
+      "set precompiled filter for packets to pass", OPT_PRIO },
+
+    { "precompiled-active-filter", 1, setprecompiledactivefilter,
+      "set precompiled filter for active pkts", OPT_PRIO },
+#endif
+
 #ifdef MAXOCTETS
     { "maxoctets", o_int, &maxoctets,
       "Set connection traffic limit",
@@ -1447,6 +1455,29 @@
     return ok;
 }
 
+#ifdef PPP_PRECOMPILED_FILTER
+/*
+ * setprecompiledpassfilter - Set the pass filter for packets using a
+ * precompiled expression
+ */
+static int
+setprecompiledpassfilter(argv)
+    char **argv;
+{
+    return pcap_pre_compiled (*argv, &pass_filter);
+}
+
+/*
+ * setactivefilter - Set the active filter for packets
+ */
+static int
+setprecompiledactivefilter(argv)
+    char **argv;
+{
+    return pcap_pre_compiled (*argv, &active_filter);
+}
+#endif
+
 #ifdef PPP_FILTER
 /*
  * setpassfilter - Set the pass filter for packets
@@ -1458,7 +1489,7 @@
     pcap_t *pc;
     int ret = 0;
 
-    pc = pcap_open_dead(DLT_PPP_WITH_DIRECTION, 65535);
+    pc = pcap_open_dead(DLT_PPP_PPPD, 65535);
     if (pcap_compile(pc, &pass_filter, *argv, 1, netmask) == -1) {
 	option_error("error in pass-filter expression: %s\n",
 		     pcap_geterr(pc));
@@ -1479,7 +1510,7 @@
     pcap_t *pc;
     int ret = 0;
 
-    pc = pcap_open_dead(DLT_PPP_WITH_DIRECTION, 65535);
+    pc = pcap_open_dead(DLT_PPP_PPPD, 65535);
     if (pcap_compile(pc, &active_filter, *argv, 1, netmask) == -1) {
 	option_error("error in active-filter expression: %s\n",
 		     pcap_geterr(pc));
Index: ppp-2.4.3/pppd/pcap_pcc.c
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ ppp-2.4.3/pppd/pcap_pcc.c	2007-06-04 13:22:14.321678056 +0200
@@ -0,0 +1,74 @@
+#include <pcap.h>
+#include <pcap-bpf.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include "pppd.h"
+
+int pcap_pre_compiled (char * fname, struct bpf_program *p)
+{
+    char buf[128];
+    int line = 0, size = 0, index=0, ret=1;
+    FILE *f = fopen (fname, "r");
+    if (!f)
+    {
+       option_error("error opening precompiled active-filter '%s': %s",
+                    fname, strerror (errno));
+       return 0;
+    }
+    while (fgets (buf, 127, f))
+    {
+       line++;
+       if (*buf == '#')
+           continue;
+       if (size)
+       {
+           /*
+             struct bpf_insn {
+             u_short   code;
+             u_char    jt;
+             u_char    jf;
+             bpf_int32 k;
+             }
+           */
+           struct bpf_insn * insn = & p->bf_insns[index];
+           unsigned code, jt, jf, k;
+           if (sscanf (buf, "%u %u %u %u", &code, &jt, &jf, &k) != 4)
+           {
+               goto err;
+           }
+           insn->code = code;
+           insn->jt = jt;
+           insn->jf = jf;
+           insn->k  = k;
+           index++;
+       }
+       else
+       {
+           if (sscanf (buf, "%u", &size) != 1)
+           {
+               goto err;
+           }
+           p->bf_len = size;
+           p->bf_insns = (struct bpf_insn *) 
+               malloc (size * sizeof (struct bpf_insn));
+       }
+    } 
+    if (size != index)
+    {
+       option_error("error in precompiled active-filter,"
+                    " expected %d expressions, got %dn",
+                    size, index);
+       ret = 0;
+    }
+    fclose(f);
+    return ret;
+
+err:
+  option_error("error in precompiled active-filter"
+              " expression line %s:%d (wrong size)\n", 
+              fname, line);
+  fclose (f);
+  return 0;
+}
Index: ppp-2.4.3/pppd/pcap_pcc.h
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ ppp-2.4.3/pppd/pcap_pcc.h	2007-06-04 13:22:14.321678056 +0200
@@ -0,0 +1,7 @@
+#ifndef PCAP_PCC_H
+#define PCAP_PCC_H
+
+#include <pcap.h>
+
+int pcap_pre_compiled (char * fname, struct bpf_program *p);
+#endif /* PCAP_PCC_H */
