iproute2: display devconf info

index 1c3e4da..f49e246 100644
@@ -386,6 +386,126 @@ static void print_link_stats(FILE *fp, const struct rtnl_link_stats *s)
 	}
 }
 
+static const char *ipv4_devconf[] = {
+	"forwarding",
+	"mc forwarding",
+	"proxy arp",
+	"accept redirects",
+	"secure redirects",
+	"send redirects",
+	"shared media",
+	"rp filter",
+	"accept source route",
+	"bootp relay",
+	"log martians",
+	"tag",
+	"arpfilter",
+	"medium id",
+	"noxfrm",
+	"nopolicy",
+	"force igmp version",
+	"arp announce",
+	"arp ignore",
+	"promote secondaries",
+	"arp accept",
+	"arp notify",
+	"accept local",
+	"src vmark",
+	"proxy arp pvlan",
+	"route localnet",
+};
+
+static void print_inet_conf(FILE *fp, struct rtattr *ininfo)
+{
+	struct rtattr *rta, *tb[IFLA_INET_MAX+1];
+
+	parse_rtattr_nested(tb, IFLA_INET_MAX, ininfo);
+
+	if ((rta = tb[IFLA_INET_CONF])) {
+		const __u32 *conf = (__u32 *)RTA_DATA(rta);
+		unsigned i;
+
+		fprintf(fp, "\n   ipv4 conf:");
+		for (i = 0; i < rta->rta_len && i < ARRAY_SIZE(ipv4_devconf); i++) {
+			if (conf[i] != 0)
+				fprintf(fp, "\n        %s:%u",
+					ipv4_devconf[i], conf[i]);
+		}
+	}
+}
+
+static const char *ipv6_devconf[] = {
+	"forwarding",
+	"hoplimit",
+	"mtu6",
+	"accept ra",
+	"accept redirects",
+	"autoconf",
+	"dad transmits",
+	"rtr solicits",
+	"rtr solicit interval",
+	"rtr solicit delay",
+	"use tempaddr",
+	"temp valid lft",
+	"temp prefered lft",
+	"regen max retry",
+	"max desync factor",
+	"max addresses",
+	"force mld version",
+	"accept ra defrtr",
+	"accept ra pinfo",
+	"accept ra rtr pref",
+	"rtr probe interval",
+	"accept ra rt info max plen",
+	"proxy ndp",
+	"optimistic dad",
+	"accept source route",
+	"mc forwarding",
+	"disable ipv6",
+	"accept dad",
+	"force tllao",
+	"ndisc notify",
+};
+
+static void print_inet6_conf(FILE *fp, struct rtattr *in6info)
+{
+	struct rtattr *rta, *tb[IFLA_INET6_MAX+1];
+
+	parse_rtattr_nested(tb, IFLA_INET6_MAX, in6info);
+
+	if ((rta = tb[IFLA_INET6_CONF])) {
+		const __u32 *conf = (__u32 *)RTA_DATA(rta);
+		unsigned i;
+
+		fprintf(fp, "\n   ipv6 conf:");
+		for (i = 0; i < rta->rta_len && i < ARRAY_SIZE(ipv6_devconf); i++) {
+			if (conf[i] != 0)
+				fprintf(fp, "\n        %s:%u",
+					ipv6_devconf[i], conf[i]);
+		}
+	}
+}
+
+static void print_afinfo(FILE *fp, struct rtattr *afinfo)
+{
+	struct rtattr *tb[AF_MAX+1];
+
+	if (afinfo->rta_type != IFLA_AF_SPEC) {
+		fprintf(stderr, "BUG: rta type is %d\n", afinfo->rta_type);
+		return;
+	}
+
+	parse_rtattr_nested(tb, AF_MAX, afinfo);
+
+	if (tb[AF_INET] &&
+	    (!filter.family || filter.family == AF_INET))
+		print_inet_conf(fp, tb[AF_INET]);
+
+	if (tb[AF_INET6] &&
+	    (!filter.family || filter.family == AF_INET))
+		print_inet6_conf(fp, tb[AF_INET6]);
+}
+
 int print_linkinfo(const struct sockaddr_nl *who,
 		   struct nlmsghdr *n, void *arg)
 {

@@ -509,6 +629,9 @@ int print_linkinfo(const struct sockaddr_nl *who,
 			print_link_stats(fp, RTA_DATA(tb[IFLA_STATS]));
 	}
 
+	if (show_details && tb[IFLA_AF_SPEC])
+		print_afinfo(fp, tb[IFLA_AF_SPEC]);
+
 	if (do_link && tb[IFLA_VFINFO_LIST] && tb[IFLA_NUM_VF]) {
 		struct rtattr *i, *vflist = tb[IFLA_VFINFO_LIST];
 		int rem = RTA_PAYLOAD(vflist);