iplink: bridge: export read-only timers

Netlink already provides hello_timer, tcn_timer, topology_change_timer
and gc_timer, so let's make them visible.
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>

include/utils.h

@@ -175,6 +175,24 @@ static inline __u32 nl_mgrp(__u32 group)
 	return group ? (1 << (group - 1)) : 0;
 }
 
+/* courtesy of bridge-utils */
+static inline unsigned long __tv_to_jiffies(const struct timeval *tv)
+{
+	unsigned long long jif;
+
+	jif = 1000000ULL * tv->tv_sec + tv->tv_usec;
+
+	return jif/10000;
+}
+
+static inline void __jiffies_to_tv(struct timeval *tv, unsigned long jiffies)
+{
+	unsigned long long tvusec;
+
+	tvusec = 10000ULL*jiffies;
+	tv->tv_sec = tvusec/1000000;
+	tv->tv_usec = tvusec - 1000000 * tv->tv_sec;
+}
 
 int print_timestamp(FILE *fp);
 void print_nlmsg_timestamp(FILE *fp, const struct nlmsghdr *n);

ip/iplink_bridge.c

@@ -197,6 +197,40 @@ static void bridge_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
 	if (tb[IFLA_BR_TOPOLOGY_CHANGE_DETECTED])
 		fprintf(f, "topology_change_detected %u ",
 			rta_getattr_u8(tb[IFLA_BR_TOPOLOGY_CHANGE_DETECTED]));
+
+	if (tb[IFLA_BR_HELLO_TIMER]) {
+		struct timeval tv;
+
+		__jiffies_to_tv(&tv, rta_getattr_u64(tb[IFLA_BR_HELLO_TIMER]));
+		fprintf(f, "hello_timer %4i.%.2i ", (int)tv.tv_sec,
+			(int)tv.tv_usec/10000);
+	}
+
+	if (tb[IFLA_BR_TCN_TIMER]) {
+		struct timeval tv;
+
+		__jiffies_to_tv(&tv, rta_getattr_u64(tb[IFLA_BR_TCN_TIMER]));
+		fprintf(f, "tcn_timer %4i.%.2i ", (int)tv.tv_sec,
+			(int)tv.tv_usec/10000);
+	}
+
+	if (tb[IFLA_BR_TOPOLOGY_CHANGE_TIMER]) {
+		unsigned long jiffies;
+		struct timeval tv;
+
+		jiffies = rta_getattr_u64(tb[IFLA_BR_TOPOLOGY_CHANGE_TIMER]);
+		__jiffies_to_tv(&tv, jiffies);
+		fprintf(f, "topology_change_timer %4i.%.2i ", (int)tv.tv_sec,
+			(int)tv.tv_usec/10000);
+	}
+
+	if (tb[IFLA_BR_GC_TIMER]) {
+		struct timeval tv;
+
+		__jiffies_to_tv(&tv, rta_getattr_u64(tb[IFLA_BR_GC_TIMER]));
+		fprintf(f, "gc_timer %4i.%.2i ", (int)tv.tv_sec,
+			(int)tv.tv_usec/10000);
+	}
 }
 
 static void bridge_print_help(struct link_util *lu, int argc, char **argv,