From e06e9a6bac6a8e16ee6580635f891bd2dfd1a1b6 Mon Sep 17 00:00:00 2001 From: Stephen Hemminger Date: Thu, 8 Mar 2018 18:02:19 -0800 Subject: [PATCH] ipmroute: better error message if no kernel mroute If kernel does not support the IP multicast address family, then it will report all routes (PF_UNSPEC). Give the user a better error message and abort the command. Signed-off-by: Stephen Hemminger Signed-off-by: David Ahern --- ip/ipmroute.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/ip/ipmroute.c b/ip/ipmroute.c index 03087b6c4..59c5b7718 100644 --- a/ip/ipmroute.c +++ b/ip/ipmroute.c @@ -75,10 +75,11 @@ int print_mroute(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg) fprintf(stderr, "BUG: wrong nlmsg len %d\n", len); return -1; } + if (r->rtm_type != RTN_MULTICAST) { - fprintf(stderr, "Not a multicast route (type: %s)\n", - rtnl_rtntype_n2a(r->rtm_type, b1, sizeof(b1))); - return 0; + fprintf(stderr, + "Non multicast route received, kernel does support IP multicast?\n"); + return -1; } parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len); -- 2.47.2