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[v2,iproute] bridge: dump mcast querier state

Message ID 20241030084622.4141001-1-f.pfitzner@pengutronix.de (mailing list archive)
State New
Headers show
Series [v2,iproute] bridge: dump mcast querier state | expand

Checks

Context Check Description
netdev/tree_selection success Not a local patch

Commit Message

Fabian Pfitzner Oct. 30, 2024, 8:46 a.m. UTC 
Kernel support for dumping the multicast querier state was added in this
commit [1]. As some people might be interested to get this information
from userspace, this commit implements the necessary changes to show it
via

ip -d link show [dev]

The querier state shows the following information for IPv4 and IPv6
respectively:

1) The ip address of the current querier in the network. This could be
   ourselves or an external querier.
2) The port on which the querier was seen
3) Querier timeout in seconds

[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c7fa1d9b1fb179375e889ff076a1566ecc997bfc

Signed-off-by: Fabian Pfitzner <f.pfitzner@pengutronix.de>
---

v1->v2: refactor code

 ip/iplink_bridge.c | 47 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)
diff mbox series

Patch

diff --git a/ip/iplink_bridge.c b/ip/iplink_bridge.c
index f01ffe15..f74436d3 100644
--- a/ip/iplink_bridge.c
+++ b/ip/iplink_bridge.c
@@ -661,6 +661,53 @@  static void bridge_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
 			   "mcast_querier %u ",
 			   rta_getattr_u8(tb[IFLA_BR_MCAST_QUERIER]));
 
+	if (tb[IFLA_BR_MCAST_QUERIER_STATE]) {
+		struct rtattr *bqtb[BRIDGE_QUERIER_MAX + 1];
+		SPRINT_BUF(other_time);
+
+		parse_rtattr_nested(bqtb, BRIDGE_QUERIER_MAX, tb[IFLA_BR_MCAST_QUERIER_STATE]);
+		memset(other_time, 0, sizeof(other_time));
+
+		open_json_object("mcast_querier_state_ipv4");
+		if (bqtb[BRIDGE_QUERIER_IP_ADDRESS])
+			print_string(PRINT_ANY,
+				"mcast_querier_ipv4_addr",
+				"mcast_querier_ipv4_addr %s ",
+				format_host_rta(AF_INET, bqtb[BRIDGE_QUERIER_IP_ADDRESS]));
+		if (bqtb[BRIDGE_QUERIER_IP_PORT])
+			print_uint(PRINT_ANY,
+				"mcast_querier_ipv4_port",
+				"mcast_querier_ipv4_port %u ",
+				rta_getattr_u32(bqtb[BRIDGE_QUERIER_IP_PORT]));
+		if (bqtb[BRIDGE_QUERIER_IP_OTHER_TIMER])
+			print_string(PRINT_ANY,
+				"mcast_querier_ipv4_other_timer",
+				"mcast_querier_ipv4_other_timer %s ",
+				sprint_time64(
+					rta_getattr_u64(bqtb[BRIDGE_QUERIER_IP_OTHER_TIMER]),
+									other_time));
+		close_json_object();
+		open_json_object("mcast_querier_state_ipv6");
+		if (bqtb[BRIDGE_QUERIER_IPV6_ADDRESS])
+			print_string(PRINT_ANY,
+				"mcast_querier_ipv6_addr",
+				"mcast_querier_ipv6_addr %s ",
+				format_host_rta(AF_INET6, bqtb[BRIDGE_QUERIER_IPV6_ADDRESS]));
+		if (bqtb[BRIDGE_QUERIER_IPV6_PORT])
+			print_uint(PRINT_ANY,
+				"mcast_querier_ipv6_port",
+				"mcast_querier_ipv6_port %u ",
+				rta_getattr_u32(bqtb[BRIDGE_QUERIER_IPV6_PORT]));
+		if (bqtb[BRIDGE_QUERIER_IPV6_OTHER_TIMER])
+			print_string(PRINT_ANY,
+				"mcast_querier_ipv6_other_timer",
+				"mcast_querier_ipv6_other_timer %s ",
+				sprint_time64(
+					rta_getattr_u64(bqtb[BRIDGE_QUERIER_IPV6_OTHER_TIMER]),
+									other_time));
+		close_json_object();
+	}
+
 	if (tb[IFLA_BR_MCAST_HASH_ELASTICITY])
 		print_uint(PRINT_ANY,
 			   "mcast_hash_elasticity",