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add ability to filter neighbour discovery by protocol 

Useful to be able to monitor arp and IPv6 nd seperately.
Default is both.
This commit is contained in:
Stephen Hemminger 2013-08-29 12:18:52 -07:00
parent e9e78b0db0
commit 001856532f
1 changed files with 7 additions and 1 deletions
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8
ip/ipmonitor.c
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@ -36,7 +36,6 @@ static void usage(void)
exit(-1); exit(-1);
} }
static int accept_msg(const struct sockaddr_nl *who, static int accept_msg(const struct sockaddr_nl *who,
struct nlmsghdr *n, void *arg) 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 || if (n->nlmsg_type == RTM_NEWNEIGH || n->nlmsg_type == RTM_DELNEIGH ||
n->nlmsg_type == RTM_GETNEIGH) { 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) if (prefix_banner)
fprintf(fp, "[NEIGH]"); fprintf(fp, "[NEIGH]");
print_neigh(who, n, arg); print_neigh(who, n, arg);