add bridge_slave device support

Note this depends on "iproute2: allow to change slave options via
type_slave"

ip/Makefile

@@ -5,7 +5,8 @@ IPOBJ=ip.o ipaddress.o ipaddrlabel.o iproute.o iprule.o ipnetns.o \
     iplink_vlan.o link_veth.o link_gre.o iplink_can.o \
     iplink_macvlan.o iplink_macvtap.o ipl2tp.o link_vti.o link_vti6.o \
     iplink_vxlan.o tcp_metrics.o iplink_ipoib.o ipnetconf.o link_ip6tnl.o \
-    link_iptnl.o link_gre6.o iplink_bond.o iplink_bond_slave.o iplink_hsr.o
+    link_iptnl.o link_gre6.o iplink_bond.o iplink_bond_slave.o iplink_hsr.o \
+    iplink_bridge_slave.o
 
 RTMONOBJ=rtmon.o
 

ip/iplink_bridge_slave.c

@@ -0,0 +1,181 @@
+/*
+ * iplink_bridge_slave.c	Bridge slave device support
+ *
+ *              This program is free software; you can redistribute it and/or
+ *              modify it under the terms of the GNU General Public License
+ *              as published by the Free Software Foundation; either version
+ *              2 of the License, or (at your option) any later version.
+ *
+ * Authors:     Jiri Pirko <jiri@resnulli.us>
+ */
+
+#include <stdio.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <linux/if_link.h>
+#include <linux/if_bridge.h>
+
+#include "rt_names.h"
+#include "utils.h"
+#include "ip_common.h"
+
+static void explain(void)
+{
+	fprintf(stderr,
+		"Usage: ... bridge_slave [ state STATE ] [ priority PRIO ] [cost COST ]\n"
+		"                        [ guard {on | off} ]\n"
+		"                        [ hairpin {on | off} ] \n"
+		"                        [ fastleave {on | off} ]\n"
+		"                        [ root_block {on | off} ]\n"
+		"                        [ learning {on | off} ]\n"
+		"                        [ flood {on | off} ]\n"
+	);
+}
+
+static const char *port_states[] = {
+	[BR_STATE_DISABLED] = "disabled",
+	[BR_STATE_LISTENING] = "listening",
+	[BR_STATE_LEARNING] = "learning",
+	[BR_STATE_FORWARDING] = "forwarding",
+	[BR_STATE_BLOCKING] = "blocking",
+};
+
+static void print_portstate(FILE *f, __u8 state)
+{
+	if (state <= BR_STATE_BLOCKING)
+		fprintf(f, "state %s ", port_states[state]);
+	else
+		fprintf(f, "state (%d) ", state);
+}
+
+static void print_onoff(FILE *f, char *flag, __u8 val)
+{
+	fprintf(f, "%s %s ", flag, val ? "on" : "off");
+}
+
+static void bridge_slave_print_opt(struct link_util *lu, FILE *f,
+				   struct rtattr *tb[])
+{
+	if (!tb)
+		return;
+
+	if (tb[IFLA_BRPORT_STATE])
+		print_portstate(f, rta_getattr_u8(tb[IFLA_BRPORT_STATE]));
+
+	if (tb[IFLA_BRPORT_PRIORITY])
+		fprintf(f, "priority %d ",
+			rta_getattr_u16(tb[IFLA_BRPORT_PRIORITY]));
+
+	if (tb[IFLA_BRPORT_COST])
+		fprintf(f, "cost %d ",
+			rta_getattr_u32(tb[IFLA_BRPORT_COST]));
+
+	if (tb[IFLA_BRPORT_MODE])
+		print_onoff(f, "hairpin",
+			    rta_getattr_u8(tb[IFLA_BRPORT_MODE]));
+
+	if (tb[IFLA_BRPORT_GUARD])
+		print_onoff(f, "guard",
+			    rta_getattr_u8(tb[IFLA_BRPORT_GUARD]));
+
+	if (tb[IFLA_BRPORT_PROTECT])
+		print_onoff(f, "root_block",
+			    rta_getattr_u8(tb[IFLA_BRPORT_PROTECT]));
+
+	if (tb[IFLA_BRPORT_FAST_LEAVE])
+		print_onoff(f, "fastleave",
+			    rta_getattr_u8(tb[IFLA_BRPORT_FAST_LEAVE]));
+
+	if (tb[IFLA_BRPORT_LEARNING])
+		print_onoff(f, "learning",
+			rta_getattr_u8(tb[IFLA_BRPORT_LEARNING]));
+
+	if (tb[IFLA_BRPORT_UNICAST_FLOOD])
+		print_onoff(f, "flood",
+			rta_getattr_u8(tb[IFLA_BRPORT_UNICAST_FLOOD]));
+}
+
+static void bridge_slave_parse_on_off(char *arg_name, char *arg_val,
+				      struct nlmsghdr *n, int type)
+{
+	__u8 val;
+
+	if (strcmp(arg_val, "on") == 0)
+		val = 1;
+	else if (strcmp(arg_val, "off") == 0)
+		val = 0;
+	else
+		invarg("should be \"on\" or \"off\"", arg_name);
+
+	addattr8(n, 1024, type, val);
+}
+
+static int bridge_slave_parse_opt(struct link_util *lu, int argc, char **argv,
+				  struct nlmsghdr *n)
+{
+	__u8 state;
+	__u16 priority;
+	__u32 cost;
+
+	while (argc > 0) {
+		if (matches(*argv, "state") == 0) {
+			NEXT_ARG();
+			if (get_u8(&state, *argv, 0))
+				invarg("state is invalid", *argv);
+			addattr8(n, 1024, IFLA_BRPORT_STATE, state);
+		} else if (matches(*argv, "priority") == 0) {
+			NEXT_ARG();
+			if (get_u16(&priority, *argv, 0))
+				invarg("priority is invalid", *argv);
+			addattr16(n, 1024, IFLA_BRPORT_PRIORITY, priority);
+		} else if (matches(*argv, "cost") == 0) {
+			NEXT_ARG();
+			if (get_u32(&cost, *argv, 0))
+				invarg("cost is invalid", *argv);
+			addattr32(n, 1024, IFLA_BRPORT_COST, cost);
+		} else if (matches(*argv, "hairpin") == 0) {
+			NEXT_ARG();
+			bridge_slave_parse_on_off("hairpin", *argv, n,
+						  IFLA_BRPORT_MODE);
+		} else if (matches(*argv, "guard") == 0) {
+			NEXT_ARG();
+			bridge_slave_parse_on_off("guard", *argv, n,
+						  IFLA_BRPORT_GUARD);
+		} else if (matches(*argv, "root_block") == 0) {
+			NEXT_ARG();
+			bridge_slave_parse_on_off("root_block", *argv, n,
+						  IFLA_BRPORT_PROTECT);
+		} else if (matches(*argv, "fastleave") == 0) {
+			NEXT_ARG();
+			bridge_slave_parse_on_off("fastleave", *argv, n,
+						  IFLA_BRPORT_FAST_LEAVE);
+		} else if (matches(*argv, "learning") == 0) {
+			NEXT_ARG();
+			bridge_slave_parse_on_off("learning", *argv, n,
+						  IFLA_BRPORT_LEARNING);
+		} else if (matches(*argv, "flood") == 0) {
+			NEXT_ARG();
+			bridge_slave_parse_on_off("flood", *argv, n,
+						  IFLA_BRPORT_UNICAST_FLOOD);
+		} else if (matches(*argv, "help") == 0) {
+			explain();
+			return -1;
+		} else {
+			fprintf(stderr, "bridge_slave: unknown option \"%s\"?\n",
+				*argv);
+			explain();
+			return -1;
+		}
+		argc--, argv++;
+	}
+
+	return 0;
+}
+
+struct link_util bridge_slave_link_util = {
+	.id		= "bridge",
+	.maxattr	= IFLA_BRPORT_MAX,
+	.print_opt	= bridge_slave_print_opt,
+	.parse_opt	= bridge_slave_parse_opt,
+	.slave		= true,
+};