34 lines
1.1 KiB
Diff
34 lines
1.1 KiB
Diff
pppd: Fill in default gateway on Linux
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On Linux, when pppd creates the default route, it does not set the peer
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address as gateway, leading to a default route without gateway address.
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This behaviour breaks various downstream programs which attempt to infer
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the default gateway IP address from the system default route entry.
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This patch addresses the issue by filling in the peer address as gateway
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when generating the default route entry.
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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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--- a/pppd/sys-linux.c
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+++ b/pppd/sys-linux.c
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@@ -1710,6 +1710,9 @@ int sifdefaultroute (int unit, u_int32_t
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memset (&rt, 0, sizeof (rt));
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SET_SA_FAMILY (rt.rt_dst, AF_INET);
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+ SET_SA_FAMILY(rt.rt_gateway, AF_INET);
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+ SIN_ADDR(rt.rt_gateway) = gateway;
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+
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rt.rt_dev = ifname;
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if (kernel_version > KVERSION(2,1,0)) {
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@@ -1717,7 +1720,7 @@ int sifdefaultroute (int unit, u_int32_t
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SIN_ADDR(rt.rt_genmask) = 0L;
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}
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- rt.rt_flags = RTF_UP;
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+ rt.rt_flags = RTF_UP | RTF_GATEWAY;
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if (ioctl(sock_fd, SIOCADDRT, &rt) < 0) {
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if (!ok_error(errno))
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error("default route ioctl(SIOCADDRT): %m");
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