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authorBernhard Schmidt <Bernhard.Schmidt@lrz.de>2018-03-04 22:55:51 +0100
committerBernhard Schmidt <Bernhard.Schmidt@lrz.de>2018-03-04 22:55:51 +0100
commit4afa7ed562410a1170223a7bc06efb3708af6a36 (patch)
treeb895b41b7629c9a31de5cc15e7aa7805ddac87ce /src/openvpn/mroute.c
parenta6daf938f5f616a4a67caa6580b0c99e9a8c3779 (diff)
New upstream version 2.4.5upstream/2.4.5
Diffstat (limited to 'src/openvpn/mroute.c')
-rw-r--r--src/openvpn/mroute.c38
1 files changed, 31 insertions, 7 deletions
diff --git a/src/openvpn/mroute.c b/src/openvpn/mroute.c
index 74ee360..28940a8 100644
--- a/src/openvpn/mroute.c
+++ b/src/openvpn/mroute.c
@@ -5,7 +5,7 @@
* packet encryption, packet authentication, and
* packet compression.
*
- * Copyright (C) 2002-2017 OpenVPN Technologies, Inc. <sales@openvpn.net>
+ * Copyright (C) 2002-2018 OpenVPN Inc <sales@openvpn.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
@@ -65,25 +65,49 @@ is_mac_mcast_maddr(const struct mroute_addr *addr)
* Don't learn certain addresses.
*/
bool
-mroute_learnable_address(const struct mroute_addr *addr)
+mroute_learnable_address(const struct mroute_addr *addr, struct gc_arena *gc)
{
int i;
- bool not_all_zeros = false;
- bool not_all_ones = false;
+ bool all_zeros = true;
+ bool all_ones = true;
for (i = 0; i < addr->len; ++i)
{
int b = addr->raw_addr[i];
if (b != 0x00)
{
- not_all_zeros = true;
+ all_zeros = false;
}
if (b != 0xFF)
{
- not_all_ones = true;
+ all_ones = false;
}
}
- return not_all_zeros && not_all_ones && !is_mac_mcast_maddr(addr);
+
+ /* only networkss shorter than 8 bits are allowed to be all 0s. */
+ if (all_zeros
+ && !((addr->type & MR_WITH_NETBITS) && (addr->netbits < 8)))
+ {
+ msg(D_MULTI_LOW, "Can't learn %s: network is all 0s, but netbits >= 8",
+ mroute_addr_print(addr, gc));
+ return false;
+ }
+
+ if (all_ones)
+ {
+ msg(D_MULTI_LOW, "Can't learn %s: network is all 1s",
+ mroute_addr_print(addr, gc));
+ return false;
+ }
+
+ if (is_mac_mcast_maddr(addr))
+ {
+ msg(D_MULTI_LOW, "Can't learn %s: network is a multicast address",
+ mroute_addr_print(addr, gc));
+ return false;
+ }
+
+ return true;
}
static inline void