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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
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