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From 11aa07ed939193e85516c287a57dee1837242972 Mon Sep 17 00:00:00 2001
From: Thomas Haller <thaller@redhat.com>
Date: Mon, 4 Jan 2016 18:54:26 +0100
Subject: core: fix failure to configure routes due to wrong device-route for
IPv4 peer-addresses
As in the case of a OpenVPN connection, we might add an address like:
10.8.0.58/32 ptp 10.8.0.57
In this case, kernel would automatically add a device-route like:
10.8.0.57/32 via 0.0.0.0 dev 32 metric 0 mss 0 src rtprot-kernel scope link pref-src 10.8.0.58
nm_ip4_config_commit() checks all IP addresses to figure out
the present device-routes. Then the routes are synced by NMRouteManager.
Due to a bug, we would not consider the peer-address, but the local-address
and configure a route 10.8.0.58/32, instead of 10.8.0.57/32.
That stays mostly unnoticed, because usually the peer and the local-address are
in the same subnet, so that there is no difference (/32 is an example of the
peer-address being in a different subnet).
It also seems that due to a bug fixed by df4e5357521 this issue didn't surface.
Probably because we would not notice the 10.8.0.57/32 right away and thus
nm_route_manager_ip4_route_sync() would not wrongly delete it.
https://bugzilla.gnome.org/show_bug.cgi?id=759892
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=809195
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=809494
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=809526
https://bugs.archlinux.org/task/47535
https://bugzilla.redhat.com/show_bug.cgi?id=1294309
https://mail.gnome.org/archives/networkmanager-list/2015-December/msg00059.html
diff --git a/src/nm-ip4-config.c b/src/nm-ip4-config.c
index f625d35..61e29af 100644
--- a/src/nm-ip4-config.c
+++ b/src/nm-ip4-config.c
@@ -298,7 +298,8 @@ nm_ip4_config_commit (const NMIP4Config *config, int ifindex, gboolean routes_fu
route.ifindex = ifindex;
route.source = NM_IP_CONFIG_SOURCE_KERNEL;
- route.network = nm_utils_ip4_address_clear_host_address (addr->address, addr->plen);
+ route.network = nm_utils_ip4_address_clear_host_address (addr->peer_address ? : addr->address,
+ addr->plen);
route.plen = addr->plen;
route.pref_src = addr->address;
route.metric = default_route_metric;
--
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