Blame ip/iplink_vlan.c

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/*
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 * iplink_vlan.c	VLAN device support
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 *
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 *              This program is free software; you can redistribute it and/or
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 *              modify it under the terms of the GNU General Public License
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 *              as published by the Free Software Foundation; either version
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 *              2 of the License, or (at your option) any later version.
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 *
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 * Authors:     Patrick McHardy <kaber@trash.net>
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 */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <linux/if_vlan.h>
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#include "rt_names.h"
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#include "utils.h"
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#include "ip_common.h"
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static void print_explain(FILE *f)
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{
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	fprintf(f,
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		"Usage: ... vlan id VLANID\n"
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		"		[ protocol VLANPROTO ]\n"
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		"		[ reorder_hdr { on | off } ]\n"
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		"		[ gvrp { on | off } ]\n"
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		"		[ mvrp { on | off } ]\n"
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		"		[ loose_binding { on | off } ]\n"
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		"		[ bridge_binding { on | off } ]\n"
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		"		[ ingress-qos-map QOS-MAP ]\n"
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		"		[ egress-qos-map QOS-MAP ]\n"
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		"\n"
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		"VLANID := 0-4095\n"
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		"VLANPROTO: [ 802.1Q | 802.1ad ]\n"
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		"QOS-MAP := [ QOS-MAP ] QOS-MAPPING\n"
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		"QOS-MAPPING := FROM:TO\n"
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	);
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}
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static void explain(void)
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{
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	print_explain(stderr);
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}
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static int on_off(const char *msg, const char *arg)
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{
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	fprintf(stderr, "Error: argument of \"%s\" must be \"on\" or \"off\", not \"%s\"\n", msg, arg);
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	return -1;
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}
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static int vlan_parse_qos_map(int *argcp, char ***argvp, struct nlmsghdr *n,
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			      int attrtype)
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{
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	int argc = *argcp;
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	char **argv = *argvp;
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	struct ifla_vlan_qos_mapping m;
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	struct rtattr *tail;
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	tail = addattr_nest(n, 1024, attrtype);
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	while (argc > 0) {
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		char *colon = strchr(*argv, ':');
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		if (!colon)
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			break;
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		*colon = '\0';
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		if (get_u32(&m.from, *argv, 0))
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			return 1;
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		if (get_u32(&m.to, colon + 1, 0))
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			return 1;
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		argc--, argv++;
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		addattr_l(n, 1024, IFLA_VLAN_QOS_MAPPING, &m, sizeof(m));
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	}
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	addattr_nest_end(n, tail);
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	*argcp = argc;
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	*argvp = argv;
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	return 0;
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}
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static int vlan_parse_opt(struct link_util *lu, int argc, char **argv,
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			  struct nlmsghdr *n)
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{
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	struct ifla_vlan_flags flags = { 0 };
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	__u16 id, proto;
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	while (argc > 0) {
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		if (matches(*argv, "protocol") == 0) {
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			NEXT_ARG();
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			if (ll_proto_a2n(&proto, *argv))
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				invarg("protocol is invalid", *argv);
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			addattr_l(n, 1024, IFLA_VLAN_PROTOCOL, &proto, 2);
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		} else if (matches(*argv, "id") == 0) {
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			NEXT_ARG();
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			if (get_u16(&id, *argv, 0))
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				invarg("id is invalid", *argv);
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			addattr_l(n, 1024, IFLA_VLAN_ID, &id, 2);
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		} else if (matches(*argv, "reorder_hdr") == 0) {
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			NEXT_ARG();
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			flags.mask |= VLAN_FLAG_REORDER_HDR;
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			if (strcmp(*argv, "on") == 0)
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				flags.flags |= VLAN_FLAG_REORDER_HDR;
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			else if (strcmp(*argv, "off") == 0)
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				flags.flags &= ~VLAN_FLAG_REORDER_HDR;
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			else
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				return on_off("reorder_hdr", *argv);
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		} else if (matches(*argv, "gvrp") == 0) {
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			NEXT_ARG();
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			flags.mask |= VLAN_FLAG_GVRP;
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			if (strcmp(*argv, "on") == 0)
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				flags.flags |= VLAN_FLAG_GVRP;
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			else if (strcmp(*argv, "off") == 0)
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				flags.flags &= ~VLAN_FLAG_GVRP;
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			else
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				return on_off("gvrp", *argv);
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		} else if (matches(*argv, "mvrp") == 0) {
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			NEXT_ARG();
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			flags.mask |= VLAN_FLAG_MVRP;
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			if (strcmp(*argv, "on") == 0)
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				flags.flags |= VLAN_FLAG_MVRP;
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			else if (strcmp(*argv, "off") == 0)
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				flags.flags &= ~VLAN_FLAG_MVRP;
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			else
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				return on_off("mvrp", *argv);
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		} else if (matches(*argv, "loose_binding") == 0) {
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			NEXT_ARG();
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			flags.mask |= VLAN_FLAG_LOOSE_BINDING;
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			if (strcmp(*argv, "on") == 0)
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				flags.flags |= VLAN_FLAG_LOOSE_BINDING;
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			else if (strcmp(*argv, "off") == 0)
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				flags.flags &= ~VLAN_FLAG_LOOSE_BINDING;
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			else
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				return on_off("loose_binding", *argv);
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		} else if (matches(*argv, "bridge_binding") == 0) {
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			NEXT_ARG();
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			flags.mask |= VLAN_FLAG_BRIDGE_BINDING;
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			if (strcmp(*argv, "on") == 0)
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				flags.flags |= VLAN_FLAG_BRIDGE_BINDING;
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			else if (strcmp(*argv, "off") == 0)
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				flags.flags &= ~VLAN_FLAG_BRIDGE_BINDING;
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			else
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				return on_off("bridge_binding", *argv);
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		} else if (matches(*argv, "ingress-qos-map") == 0) {
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			NEXT_ARG();
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			if (vlan_parse_qos_map(&argc, &argv, n,
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					       IFLA_VLAN_INGRESS_QOS))
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				invarg("invalid ingress-qos-map", *argv);
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			continue;
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		} else if (matches(*argv, "egress-qos-map") == 0) {
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			NEXT_ARG();
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			if (vlan_parse_qos_map(&argc, &argv, n,
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					       IFLA_VLAN_EGRESS_QOS))
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				invarg("invalid egress-qos-map", *argv);
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			continue;
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		} else if (matches(*argv, "help") == 0) {
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			explain();
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			return -1;
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		} else {
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			fprintf(stderr, "vlan: unknown command \"%s\"?\n", *argv);
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			explain();
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			return -1;
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		}
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		argc--, argv++;
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	}
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	if (flags.mask)
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		addattr_l(n, 1024, IFLA_VLAN_FLAGS, &flags, sizeof(flags));
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	return 0;
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}
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static void vlan_print_map(FILE *f,
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			   const char *name_json,
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			   const char *name_fp,
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			   struct rtattr *attr)
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{
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	struct ifla_vlan_qos_mapping *m;
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	struct rtattr *i;
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	int rem;
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	open_json_array(PRINT_JSON, name_json);
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	print_nl();
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	print_string(PRINT_FP, NULL, "      %s { ", name_fp);
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	rem = RTA_PAYLOAD(attr);
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	for (i = RTA_DATA(attr); RTA_OK(i, rem); i = RTA_NEXT(i, rem)) {
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		m = RTA_DATA(i);
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		if (is_json_context()) {
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			open_json_object(NULL);
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			print_uint(PRINT_JSON, "from", NULL, m->from);
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			print_uint(PRINT_JSON, "to", NULL, m->to);
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			close_json_object();
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		} else {
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			fprintf(f, "%u:%u ", m->from, m->to);
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		}
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	}
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	close_json_array(PRINT_JSON, NULL);
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	print_string(PRINT_FP, NULL, "%s ", "}");
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}
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static void vlan_print_flags(FILE *fp, __u32 flags)
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{
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	open_json_array(PRINT_ANY, is_json_context() ? "flags" : "<");
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#define _PF(f)	if (flags & VLAN_FLAG_##f) {				\
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		flags &= ~VLAN_FLAG_##f;				\
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		print_string(PRINT_ANY, NULL, flags ? "%s," : "%s", #f); \
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	}
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	_PF(REORDER_HDR);
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	_PF(GVRP);
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	_PF(MVRP);
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	_PF(LOOSE_BINDING);
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	_PF(BRIDGE_BINDING);
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#undef _PF
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	if (flags)
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		print_hex(PRINT_ANY, NULL, "%x", flags);
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	close_json_array(PRINT_ANY, "> ");
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}
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static void vlan_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
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{
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	struct ifla_vlan_flags *flags;
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	SPRINT_BUF(b1);
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	if (!tb)
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		return;
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	if (tb[IFLA_VLAN_PROTOCOL] &&
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	    RTA_PAYLOAD(tb[IFLA_VLAN_PROTOCOL]) < sizeof(__u16))
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		return;
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	if (!tb[IFLA_VLAN_ID] ||
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	    RTA_PAYLOAD(tb[IFLA_VLAN_ID]) < sizeof(__u16))
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		return;
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	if (tb[IFLA_VLAN_PROTOCOL])
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		print_string(PRINT_ANY,
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			     "protocol",
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			     "protocol %s ",
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			     ll_proto_n2a(
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				     rta_getattr_u16(tb[IFLA_VLAN_PROTOCOL]),
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				     b1, sizeof(b1)));
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	else
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		print_string(PRINT_ANY, "protocol", "protocol %s ", "802.1q");
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	print_uint(PRINT_ANY,
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		   "id",
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		   "id %u ",
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		   rta_getattr_u16(tb[IFLA_VLAN_ID]));
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	if (tb[IFLA_VLAN_FLAGS]) {
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		if (RTA_PAYLOAD(tb[IFLA_VLAN_FLAGS]) < sizeof(*flags))
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			return;
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		flags = RTA_DATA(tb[IFLA_VLAN_FLAGS]);
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		vlan_print_flags(f, flags->flags);
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	}
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	if (tb[IFLA_VLAN_INGRESS_QOS])
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		vlan_print_map(f,
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			       "ingress_qos",
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			       "ingress-qos-map",
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			       tb[IFLA_VLAN_INGRESS_QOS]);
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	if (tb[IFLA_VLAN_EGRESS_QOS])
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		vlan_print_map(f,
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			       "egress_qos",
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			       "egress-qos-map",
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			       tb[IFLA_VLAN_EGRESS_QOS]);
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}
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static void vlan_print_help(struct link_util *lu, int argc, char **argv,
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			    FILE *f)
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{
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	print_explain(f);
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}
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struct link_util vlan_link_util = {
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	.id		= "vlan",
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	.maxattr	= IFLA_VLAN_MAX,
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	.parse_opt	= vlan_parse_opt,
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	.print_opt	= vlan_print_opt,
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	.print_help	= vlan_print_help,
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};