package/network/services/ppp/patches/340-populate_default_gateway.patch

   1 pppd: Fill in default gateway on Linux
   2
   3 On Linux, when pppd creates the default route, it does not set the peer
   4 address as gateway, leading to a default route without gateway address.
   5
   6 This behaviour breaks various downstream programs which attempt to infer
   7 the default gateway IP address from the system default route entry.
   8
   9 This patch addresses the issue by filling in the peer address as gateway
  10 when generating the default route entry.
  11
  12 Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>
  13
  14 --- a/pppd/sys-linux.c
  15 +++ b/pppd/sys-linux.c
  16 @@ -1710,6 +1710,9 @@ int sifdefaultroute (int unit, u_int32_t
  17      memset (&rt, 0, sizeof (rt));
  18      SET_SA_FAMILY (rt.rt_dst, AF_INET);
  19
  20 +    SET_SA_FAMILY(rt.rt_gateway, AF_INET);
  21 +    SIN_ADDR(rt.rt_gateway) = gateway;
  22 +
  23      rt.rt_dev = ifname;
  24
  25      if (kernel_version > KVERSION(2,1,0)) {
  26 @@ -1717,7 +1720,7 @@ int sifdefaultroute (int unit, u_int32_t
  27         SIN_ADDR(rt.rt_genmask) = 0L;
  28      }
  29
  30 -    rt.rt_flags = RTF_UP;
  31 +    rt.rt_flags = RTF_UP | RTF_GATEWAY;
  32      if (ioctl(sock_fd, SIOCADDRT, &rt) < 0) {
  33         if (!ok_error(errno))
  34             error("default route ioctl(SIOCADDRT): %m");