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pppd: Retain foreign default routes on Linux
On Linux, when pppd attempts to delete its default route it does not fill
the rt_dev field of the struct rtentry used to match the system default route.
As a consequence, pppd happily deletes any default route even if it belongs
to another interface.
This patch makes pppd fill out the rt_dev field so that only own default
routes are ever matched.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
--- a/pppd/sys-linux.c
+++ b/pppd/sys-linux.c
@@ -1753,6 +1753,7 @@ int cifdefaultroute (int unit, u_int32_t
SIN_ADDR(rt.rt_genmask) = 0L;
}
+ rt.rt_dev = ifname;
rt.rt_flags = RTF_UP;
if (ioctl(sock_fd, SIOCDELRT, &rt) < 0 && errno != ESRCH) {
if (still_ppp()) {
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