main/ppp: add patch that allows set defaultroute-metric

fixes #748

1 files changed, 129 insertions, 0 deletions

diff --git a/main/ppp/defaultroute-metric.3.patch b/main/ppp/defaultroute-metric.3.patch
new file mode 100644
index 0000000000..2eee724c23
--- /dev/null
+++ b/main/ppp/defaultroute-metric.3.patch
@@ -0,0 +1,129 @@
+Default route metric
+
+Define the metric of the default route and only add it if there
+is no other default route with the same metric.  With the default
+value of -1, the route is only added if there is no default route
+at all.
+
+Olivier Mehani <olivier.mehani@nicta.com.au>
+Index: ppp-2.4.4/pppd/options.c
+===================================================================
+--- ppp-2.4.4.orig/pppd/options.c	2006-06-18 21:26:00.000000000 +1000
++++ ppp-2.4.4/pppd/options.c	2010-04-22 17:08:38.000000000 +1000
+@@ -119,6 +119,7 @@
+ bool	dryrun;			/* print out option values and exit */
+ char	*domain;		/* domain name set by domain option */
+ int	child_wait = 5;		/* # seconds to wait for children at exit */
++int	dfl_route_metric = -1;	/* metric of the default route to set over the PPP link */
+ 
+ #ifdef MAXOCTETS
+ unsigned int  maxoctets = 0;    /* default - no limit */
+@@ -281,6 +282,10 @@
+       "Number of seconds to wait for child processes at exit",
+       OPT_PRIO },
+ 
++    { "defaultroute-metric", o_int, &dfl_route_metric,
++      "Metric to use for the default route (Linux only; -1 for default behavior)",
++      OPT_PRIV|OPT_LLIMIT|OPT_INITONLY, NULL, 0, -1 },
++
+ #ifdef HAVE_MULTILINK
+     { "multilink", o_bool, &multilink,
+       "Enable multilink operation", OPT_PRIO | 1 },
+Index: ppp-2.4.4/pppd/sys-linux.c
+===================================================================
+--- ppp-2.4.4.orig/pppd/sys-linux.c	2005-08-27 08:44:35.000000000 +1000
++++ ppp-2.4.4/pppd/sys-linux.c	2010-04-22 17:09:44.000000000 +1000
+@@ -232,7 +232,7 @@
+ static void close_route_table (void);
+ static int open_route_table (void);
+ static int read_route_table (struct rtentry *rt);
+-static int defaultroute_exists (struct rtentry *rt);
++static int defaultroute_exists (struct rtentry *rt, int metric);
+ static int get_ether_addr (u_int32_t ipaddr, struct sockaddr *hwaddr,
+ 			   char *name, int namelen);
+ static void decode_version (char *buf, int *version, int *mod, int *patch);
+@@ -242,6 +242,8 @@
+ 
+ extern u_char	inpacket_buf[];	/* borrowed from main.c */
+ 
++extern int dfl_route_metric;
++
+ /*
+  * SET_SA_FAMILY - set the sa_family field of a struct sockaddr,
+  * if it exists.
+@@ -1526,9 +1528,10 @@
+ /********************************************************************
+  *
+  * defaultroute_exists - determine if there is a default route
++ * with the given metric (or negative for any)
+  */
+ 
+-static int defaultroute_exists (struct rtentry *rt)
++static int defaultroute_exists (struct rtentry *rt, int metric)
+ {
+     int result = 0;
+ 
+@@ -1541,7 +1544,8 @@
+ 
+ 	if (kernel_version > KVERSION(2,1,0) && SIN_ADDR(rt->rt_genmask) != 0)
+ 	    continue;
+-	if (SIN_ADDR(rt->rt_dst) == 0L) {
++	if (SIN_ADDR(rt->rt_dst) == 0L && (metric < 0 ||
++			 (metric >= 0 && (rt->rt_metric + 1) == metric))) {
+ 	    result = 1;
+ 	    break;
+ 	}
+@@ -1588,13 +1592,13 @@
+ {
+     struct rtentry rt;
+ 
+-    if (defaultroute_exists(&rt) && strcmp(rt.rt_dev, ifname) != 0) {
++    if (defaultroute_exists(&rt, dfl_route_metric) && strcmp(rt.rt_dev, ifname) != 0) {
+ 	if (rt.rt_flags & RTF_GATEWAY)
+-	    error("not replacing existing default route via %I",
+-		  SIN_ADDR(rt.rt_gateway));
++	    error("not replacing existing default route via %I with metric %d",
++		  SIN_ADDR(rt.rt_gateway), dfl_route_metric);
+ 	else
+-	    error("not replacing existing default route through %s",
+-		  rt.rt_dev);
++	    error("not replacing existing default route through %s with metric %d",
++		  rt.rt_dev, dfl_route_metric);
+ 	return 0;
+     }
+ 
+@@ -1602,6 +1606,7 @@
+     SET_SA_FAMILY (rt.rt_dst, AF_INET);
+ 
+     rt.rt_dev = ifname;
++    rt.rt_metric = dfl_route_metric + 1; /* +1 for binary compatibility */
+ 
+     if (kernel_version > KVERSION(2,1,0)) {
+ 	SET_SA_FAMILY (rt.rt_genmask, AF_INET);
+@@ -1634,6 +1639,9 @@
+     SET_SA_FAMILY (rt.rt_dst,     AF_INET);
+     SET_SA_FAMILY (rt.rt_gateway, AF_INET);
+ 
++    rt.rt_dev = ifname;
++    rt.rt_metric = dfl_route_metric + 1; /* +1 for binary compatibility */
++
+     if (kernel_version > KVERSION(2,1,0)) {
+ 	SET_SA_FAMILY (rt.rt_genmask, AF_INET);
+ 	SIN_ADDR(rt.rt_genmask) = 0L;
+Index: ppp-2.4.4/pppd/pppd.8
+===================================================================
+--- ppp-2.4.4.orig/pppd/pppd.8	2006-06-16 10:01:23.000000000 +1000
++++ ppp-2.4.4/pppd/pppd.8	2010-04-22 17:08:38.000000000 +1000
+@@ -121,6 +121,12 @@
+ This entry is removed when the PPP connection is broken.  This option
+ is privileged if the \fInodefaultroute\fR option has been specified.
+ .TP
++.B defaultroute-metric
++Define the metric of the \fIdefaultroute\fR and only add it if there
++is no other default route with the same metric.  With the default
++value of -1, the route is only added if there is no default route at
++all.
++.TP
+ .B disconnect \fIscript
+ Execute the command specified by \fIscript\fR, by passing it to a
+ shell, after