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zebra: Ignore RTM_GETNEIGH messages from the linux kernel

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The linux kernel will occassionally send RTM_GETNEIGH when
it expects user space to help in resolution of an ARP entry.
See linux kernel commit:

commit 3e25c65ed085b361cc91a8f02e028f1158c9f255
Author: Tim Gardner <tim.gardner@canonical.com>
Date:   Thu Aug 29 06:38:47 2013 -0600

    net: neighbour: Remove CONFIG_ARPD

Since we don't care about this, let's just safely ignore this
message for the moment.  I imagine in the future we might
care when we implement neighbor managment in the system.

Reported By: Stefan Priebe <s.priebe@profihost.ag>
Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
This commit is contained in:
Donald Sharp 2020-01-04 07:42:22 -05:00
parent 93789698ce
commit 951f8bcbba
1 changed files with 12 additions and 0 deletions
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12
zebra/kernel_netlink.c
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@ -290,6 +290,18 @@ static int netlink_information_fetch(struct nlmsghdr *h, ns_id_t ns_id,
return netlink_neigh_change(h, ns_id); return netlink_neigh_change(h, ns_id);
case RTM_DELNEIGH: case RTM_DELNEIGH:
return netlink_neigh_change(h, ns_id); return netlink_neigh_change(h, ns_id);
case RTM_GETNEIGH:
/*
* Kernel in some situations when it expects
* user space to resolve arp entries, we will
* receive this notification. As we don't
* need this notification and as that
* we don't want to spam the log file with
* below messages, just ignore.
*/
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug("Received RTM_GETNEIGH, ignoring");
break;
case RTM_NEWRULE: case RTM_NEWRULE:
return netlink_rule_change(h, ns_id, startup); return netlink_rule_change(h, ns_id, startup);
case RTM_DELRULE: case RTM_DELRULE: