diff --git a/include/linux/rtnetlink.h b/include/linux/rtnetlink.h
index 5bf618241ab910eaf1c92a53026ccc672bf6165a..4e81836191df82ebaa5d8bf19e658ad29e92c16e 100644
--- a/include/linux/rtnetlink.h
+++ b/include/linux/rtnetlink.h
@@ -491,9 +491,11 @@ struct nduseroptmsg
 	unsigned char	nduseropt_family;
 	unsigned char	nduseropt_pad1;
 	unsigned short	nduseropt_opts_len;	/* Total length of options */
+	int		nduseropt_ifindex;
 	__u8		nduseropt_icmp_type;
 	__u8		nduseropt_icmp_code;
 	unsigned short	nduseropt_pad2;
+	unsigned int	nduseropt_pad3;
 	/* Followed by one or more ND options */
 };
 
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index 36f7dbfb6dbbd72cc36cca13157930c9fdc4915a..67997a74ddce15d85e43c8146a9ed62f91085f77 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -1037,6 +1037,7 @@ static void ndisc_ra_useropt(struct sk_buff *ra, struct nd_opt_hdr *opt)
 
 	ndmsg = nlmsg_data(nlh);
 	ndmsg->nduseropt_family = AF_INET6;
+	ndmsg->nduseropt_ifindex = ra->dev->ifindex;
 	ndmsg->nduseropt_icmp_type = icmp6h->icmp6_type;
 	ndmsg->nduseropt_icmp_code = icmp6h->icmp6_code;
 	ndmsg->nduseropt_opts_len = opt->nd_opt_len << 3;