diff mbox

iproute2: add ability to filter neighbour discovery by protocol

Message ID 20130829122134.0d5a6f72@nehalam.linuxnetplumber.net
State Accepted, archived
Delegated to: stephen hemminger
Headers show

Commit Message

Stephen Hemminger Aug. 29, 2013, 7:21 p.m. UTC 
Useful to be able to monitor arp and IPv6 nd seperately.
Default is both.
---
 ip/ipmonitor.c |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)
diff mbox

Patch

diff --git a/ip/ipmonitor.c b/ip/ipmonitor.c
index 4895390..70f2a7a 100644
--- a/ip/ipmonitor.c
+++ b/ip/ipmonitor.c
@@ -36,7 +36,6 @@  static void usage(void)
 	exit(-1);
 }
 
-
 static int accept_msg(const struct sockaddr_nl *who,
 		      struct nlmsghdr *n, void *arg)
 {
@@ -88,6 +87,13 @@  static int accept_msg(const struct sockaddr_nl *who,
 	}
 	if (n->nlmsg_type == RTM_NEWNEIGH || n->nlmsg_type == RTM_DELNEIGH ||
 	    n->nlmsg_type == RTM_GETNEIGH) {
+		if (preferred_family) {
+			struct ndmsg *r = NLMSG_DATA(n);
+
+			if (r->ndm_family != preferred_family)
+				return 0;
+		}
+
 		if (prefix_banner)
 			fprintf(fp, "[NEIGH]");
 		print_neigh(who, n, arg);