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Index: ppp-2.4.3/pppd/ipcp.c
===================================================================
--- ppp-2.4.3.orig/pppd/ipcp.c 2007-06-04 13:22:09.003486544 +0200
+++ ppp-2.4.3/pppd/ipcp.c 2007-06-04 13:22:11.387124176 +0200
@@ -197,6 +197,16 @@
"disable defaultroute option", OPT_ALIAS | OPT_A2CLR,
&ipcp_wantoptions[0].default_route },
+#ifdef __linux__
+ { "replacedefaultroute", o_bool,
+ &ipcp_wantoptions[0].replace_default_route,
+ "Replace default route", 1
+ },
+ { "noreplacedefaultroute", o_bool,
+ &ipcp_allowoptions[0].replace_default_route,
+ "Never replace default route", OPT_A2COPY,
+ &ipcp_wantoptions[0].replace_default_route },
+#endif
{ "proxyarp", o_bool, &ipcp_wantoptions[0].proxy_arp,
"Add proxy ARP entry", OPT_ENABLE|1, &ipcp_allowoptions[0].proxy_arp },
{ "noproxyarp", o_bool, &ipcp_allowoptions[0].proxy_arp,
@@ -263,7 +273,7 @@
ip_active_pkt
};
-static void ipcp_clear_addrs __P((int, u_int32_t, u_int32_t));
+static void ipcp_clear_addrs __P((int, u_int32_t, u_int32_t, bool));
static void ipcp_script __P((char *)); /* Run an up/down script */
static void ipcp_script_done __P((void *));
@@ -1659,7 +1669,12 @@
if (!sifnpmode(u, PPP_IP, NPMODE_QUEUE))
return 0;
if (wo->default_route)
+#ifndef __linux__
if (sifdefaultroute(u, wo->ouraddr, wo->hisaddr))
+#else
+ if (sifdefaultroute(u, wo->ouraddr, wo->hisaddr,
+ wo->replace_default_route))
+#endif
default_route_set[u] = 1;
if (wo->proxy_arp)
if (sifproxyarp(u, wo->hisaddr))
@@ -1741,7 +1756,8 @@
*/
if (demand) {
if (go->ouraddr != wo->ouraddr || ho->hisaddr != wo->hisaddr) {
- ipcp_clear_addrs(f->unit, wo->ouraddr, wo->hisaddr);
+ ipcp_clear_addrs(f->unit, wo->ouraddr, wo->hisaddr,
+ wo->replace_default_route);
if (go->ouraddr != wo->ouraddr) {
warn("Local IP address changed to %I", go->ouraddr);
script_setenv("OLDIPLOCAL", ip_ntoa(wo->ouraddr), 0);
@@ -1766,7 +1782,12 @@
/* assign a default route through the interface if required */
if (ipcp_wantoptions[f->unit].default_route)
+#ifndef __linux__
if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr))
+#else
+ if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr,
+ wo->replace_default_route))
+#endif
default_route_set[f->unit] = 1;
/* Make a proxy ARP entry if requested. */
@@ -1813,7 +1834,12 @@
/* assign a default route through the interface if required */
if (ipcp_wantoptions[f->unit].default_route)
+#ifndef __linux__
if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr))
+#else
+ if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr,
+ wo->replace_default_route))
+#endif
default_route_set[f->unit] = 1;
/* Make a proxy ARP entry if requested. */
@@ -1890,7 +1916,7 @@
sifnpmode(f->unit, PPP_IP, NPMODE_DROP);
sifdown(f->unit);
ipcp_clear_addrs(f->unit, ipcp_gotoptions[f->unit].ouraddr,
- ipcp_hisoptions[f->unit].hisaddr);
+ ipcp_hisoptions[f->unit].hisaddr, 0);
}
/* Execute the ip-down script */
@@ -1906,16 +1932,25 @@
* proxy arp entries, etc.
*/
static void
-ipcp_clear_addrs(unit, ouraddr, hisaddr)
+ipcp_clear_addrs(unit, ouraddr, hisaddr, replacedefaultroute)
int unit;
u_int32_t ouraddr; /* local address */
u_int32_t hisaddr; /* remote address */
+ bool replacedefaultroute;
{
if (proxy_arp_set[unit]) {
cifproxyarp(unit, hisaddr);
proxy_arp_set[unit] = 0;
}
- if (default_route_set[unit]) {
+ /* If replacedefaultroute, sifdefaultroute will be called soon
+ * with replacedefaultroute set and that will overwrite the current
+ * default route. This is the case only when doing demand, otherwise
+ * during demand, this cifdefaultroute would restore the old default
+ * route which is not what we want in this case. In the non-demand
+ * case, we'll delete the default route and restore the old if there
+ * is one saved by an sifdefaultroute with replacedefaultroute.
+ */
+ if (!replacedefaultroute && default_route_set[unit]) {
cifdefaultroute(unit, ouraddr, hisaddr);
default_route_set[unit] = 0;
}
Index: ppp-2.4.3/pppd/ipcp.h
===================================================================
--- ppp-2.4.3.orig/pppd/ipcp.h 2007-06-04 13:22:08.263599024 +0200
+++ ppp-2.4.3/pppd/ipcp.h 2007-06-04 13:22:11.387124176 +0200
@@ -70,6 +70,7 @@
bool old_addrs; /* Use old (IP-Addresses) option? */
bool req_addr; /* Ask peer to send IP address? */
bool default_route; /* Assign default route through interface? */
+ bool replace_default_route; /* Replace default route through interface? */
bool proxy_arp; /* Make proxy ARP entry for peer? */
bool neg_vj; /* Van Jacobson Compression? */
bool old_vj; /* use old (short) form of VJ option? */
Index: ppp-2.4.3/pppd/pppd.h
===================================================================
--- ppp-2.4.3.orig/pppd/pppd.h 2007-06-04 13:22:09.005486240 +0200
+++ ppp-2.4.3/pppd/pppd.h 2007-06-04 13:22:11.388124024 +0200
@@ -642,7 +642,11 @@
int cif6addr __P((int, eui64_t, eui64_t));
/* Remove an IPv6 address from i/f */
#endif
+#ifndef __linux__
int sifdefaultroute __P((int, u_int32_t, u_int32_t));
+#else
+int sifdefaultroute __P((int, u_int32_t, u_int32_t, bool replace_default_rt));
+#endif
/* Create default route through i/f */
int cifdefaultroute __P((int, u_int32_t, u_int32_t));
/* Delete default route through i/f */
Index: ppp-2.4.3/pppd/sys-linux.c
===================================================================
--- ppp-2.4.3.orig/pppd/sys-linux.c 2007-06-04 13:22:08.807516336 +0200
+++ ppp-2.4.3/pppd/sys-linux.c 2007-06-04 13:22:11.389123872 +0200
@@ -206,6 +206,8 @@
static int if_is_up; /* Interface has been marked up */
static u_int32_t default_route_gateway; /* Gateway for default route added */
+static struct rtentry old_def_rt; /* Old default route */
+static int default_rt_repl_rest; /* replace and restore old default rt */
static u_int32_t proxy_arp_addr; /* Addr for proxy arp entry added */
static char proxy_arp_dev[16]; /* Device for proxy arp entry */
static u_int32_t our_old_addr; /* for detecting address changes */
@@ -1520,6 +1522,9 @@
p = NULL;
}
+ SET_SA_FAMILY (rt->rt_dst, AF_INET);
+ SET_SA_FAMILY (rt->rt_gateway, AF_INET);
+
SIN_ADDR(rt->rt_dst) = strtoul(cols[route_dest_col], NULL, 16);
SIN_ADDR(rt->rt_gateway) = strtoul(cols[route_gw_col], NULL, 16);
SIN_ADDR(rt->rt_genmask) = strtoul(cols[route_mask_col], NULL, 16);
@@ -1589,19 +1594,53 @@
/********************************************************************
*
* sifdefaultroute - assign a default route through the address given.
- */
-
-int sifdefaultroute (int unit, u_int32_t ouraddr, u_int32_t gateway)
-{
- struct rtentry rt;
-
- if (defaultroute_exists(&rt) && strcmp(rt.rt_dev, ifname) != 0) {
- u_int32_t old_gateway = SIN_ADDR(rt.rt_gateway);
-
- if (old_gateway != gateway)
- error("not replacing existing default route to %s [%I]",
- rt.rt_dev, old_gateway);
- return 0;
+ *
+ * If the global default_rt_repl_rest flag is set, then this function
+ * already replaced the original system defaultroute with some other
+ * route and it should just replace the current defaultroute with
+ * another one, without saving the current route. Use: demand mode,
+ * when pppd sets first a defaultroute it it's temporary ppp0 addresses
+ * and then changes the temporary addresses to the addresses for the real
+ * ppp connection when it has come up.
+ */
+
+int sifdefaultroute (int unit, u_int32_t ouraddr, u_int32_t gateway, bool replace)
+{
+ struct rtentry rt, tmp_rt;
+ struct rtentry *del_rt = NULL;
+
+
+ if (default_rt_repl_rest) {
+ /* We have already reclaced the original defaultroute, if we
+ * are called again, we will delete the current default route
+ * and set the new default route in this function.
+ * - this is normally only the case the doing demand: */
+ if (defaultroute_exists( &tmp_rt ))
+ del_rt = &tmp_rt;
+ } else if ( defaultroute_exists( &old_def_rt ) &&
+ strcmp( old_def_rt.rt_dev, ifname ) != 0) {
+ /* We did not yet replace an existing default route, let's
+ * check if we should save and replace a default route:
+ */
+ u_int32_t old_gateway = SIN_ADDR(old_def_rt.rt_gateway);
+
+ if (old_gateway != gateway) {
+ if (!replace) {
+ error("not replacing default route to %s [%I]",
+ old_def_rt.rt_dev, old_gateway);
+ return 0;
+ } else {
+ // we need to copy rt_dev because we need it permanent too:
+ char * tmp_dev = malloc(strlen(old_def_rt.rt_dev)+1);
+ strcpy(tmp_dev, old_def_rt.rt_dev);
+ old_def_rt.rt_dev = tmp_dev;
+
+ notice("replacing old default route to %s [%I]",
+ old_def_rt.rt_dev, old_gateway);
+ default_rt_repl_rest = 1;
+ del_rt = &old_def_rt;
+ }
+ }
}
memset (&rt, '\0', sizeof (rt));
@@ -1623,6 +1662,12 @@
error("default route ioctl(SIOCADDRT): %m");
return 0;
}
+ if (default_rt_repl_rest && del_rt)
+ if (ioctl(sock_fd, SIOCDELRT, del_rt) < 0) {
+ if ( ! ok_error ( errno ))
+ error("del old default route ioctl(SIOCDELRT): %m(%d)", errno);
+ return 0;
+ }
default_route_gateway = gateway;
return 1;
@@ -1658,6 +1703,16 @@
return 0;
}
}
+ if (default_rt_repl_rest) {
+ notice("restoring old default route to %s [%I]",
+ old_def_rt.rt_dev, SIN_ADDR(old_def_rt.rt_gateway));
+ if (ioctl(sock_fd, SIOCADDRT, &old_def_rt) < 0) {
+ if ( ! ok_error ( errno ))
+ error("restore default route ioctl(SIOCADDRT): %m(%d)", errno);
+ return 0;
+ }
+ default_rt_repl_rest = 0;
+ }
return 1;
}
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