The code in sitnl_route_set() used to treat "route can not be installed
because it already exists" (EEXIST) as "not an error".
This is arguably a reasonable approach, but needs to handled higher
up - if the low level add_route() function say "no error", we will try
to remove that route later on in delete_route(), possibly removing
someone else's "already existing" route then.
So:
- remove special case in sitnl_route_set()
- do not pass NLM_F_REPLACE flag to sitnl_route_set() call - this would
cause netlink to just replace existing routes, never return EEXIST
(see "man netlink(7)")
- add detailed return code handling to route_add(), assign "2" on "-EEXIST"
(and log appropriate message).
(Note: sitnl_route_set() is a common function for sitnl route add and
delete, but EEXIST can not happen on delete - so this change has no
impact for the "delete" case)
Signed-off-by: Gert Doering <g...@greenie.muc.de>
---
src/openvpn/networking_sitnl.c | 6 +-----
src/openvpn/route.c | 10 ++++++++--
2 files changed, 9 insertions(+), 7 deletions(-)
diff --git a/src/openvpn/networking_sitnl.c b/src/openvpn/networking_sitnl.c
index fe124616..92f30044 100644
--- a/src/openvpn/networking_sitnl.c
+++ b/src/openvpn/networking_sitnl.c
@@ -944,10 +944,6 @@ sitnl_route_set(int cmd, uint32_t flags, int ifindex,
sa_family_t af_family,
}
ret = sitnl_send(&req.n, 0, 0, NULL, NULL);
- if (ret == -EEXIST)
- {
- ret = 0;
- }
err:
return ret;
}
@@ -1177,7 +1173,7 @@ sitnl_route_add(const char *iface, sa_family_t af_family,
const void *dst,
scope = RT_SCOPE_LINK;
}
- return sitnl_route_set(RTM_NEWROUTE, NLM_F_CREATE | NLM_F_REPLACE, ifindex,
+ return sitnl_route_set(RTM_NEWROUTE, NLM_F_CREATE, ifindex,
af_family, dst, prefixlen, gw, table, metric, scope,
RTPROT_BOOT, RTN_UNICAST);
}
diff --git a/src/openvpn/route.c b/src/openvpn/route.c
index 99f948ba..2db127bb 100644
--- a/src/openvpn/route.c
+++ b/src/openvpn/route.c
@@ -1594,8 +1594,14 @@ add_route(struct route_ipv4 *r,
}
status = 1;
- if (net_route_v4_add(ctx, &r->network, netmask_to_netbits2(r->netmask),
- &r->gateway, iface, 0, metric) < 0)
+ int ret = net_route_v4_add(ctx, &r->network,
netmask_to_netbits2(r->netmask),
+ &r->gateway, iface, 0, metric);
+ if (ret == -EEXIST)
+ {
+ msg(D_ROUTE, "NOTE: Linux route add command failed because route
exists");
+ status = 2;
+ }
+ else if (ret < 0)
{
msg(M_WARN, "ERROR: Linux route add command failed");
status = 0;
--
2.38.2
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