Blame tc/m_vlan.c

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/*
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 * m_vlan.c		vlan manipulation module
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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:     Jiri Pirko <jiri@resnulli.us>
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 */
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <linux/if_ether.h>
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#include "utils.h"
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#include "rt_names.h"
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#include "tc_util.h"
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#include <linux/tc_act/tc_vlan.h>
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static const char * const action_names[] = {
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	[TCA_VLAN_ACT_POP] = "pop",
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	[TCA_VLAN_ACT_PUSH] = "push",
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	[TCA_VLAN_ACT_MODIFY] = "modify",
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};
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static void explain(void)
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{
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	fprintf(stderr,
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		"Usage: vlan pop\n"
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		"       vlan push [ protocol VLANPROTO ] id VLANID [ priority VLANPRIO ] [CONTROL]\n"
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		"       vlan modify [ protocol VLANPROTO ] id VLANID [ priority VLANPRIO ] [CONTROL]\n"
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		"       VLANPROTO is one of 802.1Q or 802.1AD\n"
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		"            with default: 802.1Q\n"
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		"       CONTROL := reclassify | pipe | drop | continue | pass |\n"
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		"                  goto chain <CHAIN_INDEX>\n");
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}
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static void usage(void)
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{
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	explain();
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	exit(-1);
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}
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static bool has_push_attribs(int action)
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{
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	return action == TCA_VLAN_ACT_PUSH || action == TCA_VLAN_ACT_MODIFY;
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}
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static void unexpected(const char *arg)
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{
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	fprintf(stderr,
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		"unexpected \"%s\" - action already specified\n",
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		arg);
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	explain();
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}
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static int parse_vlan(struct action_util *a, int *argc_p, char ***argv_p,
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		      int tca_id, struct nlmsghdr *n)
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{
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	int argc = *argc_p;
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	char **argv = *argv_p;
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	struct rtattr *tail;
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	int action = 0;
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	__u16 id;
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	int id_set = 0;
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	__u16 proto;
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	int proto_set = 0;
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	__u8 prio;
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	int prio_set = 0;
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	struct tc_vlan parm = {};
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	if (matches(*argv, "vlan") != 0)
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		return -1;
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	NEXT_ARG();
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	while (argc > 0) {
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		if (matches(*argv, "pop") == 0) {
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			if (action) {
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				unexpected(*argv);
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				return -1;
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			}
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			action = TCA_VLAN_ACT_POP;
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		} else if (matches(*argv, "push") == 0) {
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			if (action) {
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				unexpected(*argv);
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				return -1;
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			}
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			action = TCA_VLAN_ACT_PUSH;
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		} else if (matches(*argv, "modify") == 0) {
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			if (action) {
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				unexpected(*argv);
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				return -1;
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			}
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			action = TCA_VLAN_ACT_MODIFY;
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		} else if (matches(*argv, "id") == 0) {
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			if (!has_push_attribs(action))
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				invarg("only valid for push/modify", *argv);
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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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			id_set = 1;
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		} else if (matches(*argv, "protocol") == 0) {
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			if (!has_push_attribs(action))
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				invarg("only valid for push/modify", *argv);
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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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			proto_set = 1;
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		} else if (matches(*argv, "priority") == 0) {
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			if (!has_push_attribs(action))
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				invarg("only valid for push/modify", *argv);
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			NEXT_ARG();
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			if (get_u8(&prio, *argv, 0) || (prio & ~0x7))
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				invarg("prio is invalid", *argv);
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			prio_set = 1;
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		} else if (matches(*argv, "help") == 0) {
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			usage();
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		} else {
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			break;
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		}
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		argc--;
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		argv++;
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	}
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	parse_action_control_dflt(&argc, &argv, &parm.action,
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				  false, TC_ACT_PIPE);
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	if (argc) {
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		if (matches(*argv, "index") == 0) {
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			NEXT_ARG();
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			if (get_u32(&parm.index, *argv, 10)) {
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				fprintf(stderr, "vlan: Illegal \"index\"\n");
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				return -1;
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			}
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			argc--;
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			argv++;
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		}
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	}
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	if (has_push_attribs(action) && !id_set) {
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		fprintf(stderr, "id needs to be set for %s\n",
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			action_names[action]);
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		explain();
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		return -1;
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	}
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	parm.v_action = action;
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	tail = addattr_nest(n, MAX_MSG, tca_id);
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	addattr_l(n, MAX_MSG, TCA_VLAN_PARMS, &parm, sizeof(parm));
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	if (id_set)
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		addattr_l(n, MAX_MSG, TCA_VLAN_PUSH_VLAN_ID, &id, 2);
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	if (proto_set) {
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		if (proto != htons(ETH_P_8021Q) &&
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		    proto != htons(ETH_P_8021AD)) {
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			fprintf(stderr, "protocol not supported\n");
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			explain();
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			return -1;
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		}
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		addattr_l(n, MAX_MSG, TCA_VLAN_PUSH_VLAN_PROTOCOL, &proto, 2);
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	}
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	if (prio_set)
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		addattr8(n, MAX_MSG, TCA_VLAN_PUSH_VLAN_PRIORITY, prio);
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	addattr_nest_end(n, tail);
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	*argc_p = argc;
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	*argv_p = argv;
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	return 0;
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}
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static int print_vlan(struct action_util *au, FILE *f, struct rtattr *arg)
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{
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	SPRINT_BUF(b1);
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	struct rtattr *tb[TCA_VLAN_MAX + 1];
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	__u16 val;
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	struct tc_vlan *parm;
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	if (arg == NULL)
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		return -1;
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	parse_rtattr_nested(tb, TCA_VLAN_MAX, arg);
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	if (!tb[TCA_VLAN_PARMS]) {
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		fprintf(stderr, "Missing vlanparameters\n");
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		return -1;
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	}
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	parm = RTA_DATA(tb[TCA_VLAN_PARMS]);
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	print_string(PRINT_ANY, "kind", "%s ", "vlan");
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	print_string(PRINT_ANY, "vlan_action", " %s",
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		     action_names[parm->v_action]);
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	switch (parm->v_action) {
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	case TCA_VLAN_ACT_PUSH:
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	case TCA_VLAN_ACT_MODIFY:
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		if (tb[TCA_VLAN_PUSH_VLAN_ID]) {
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			val = rta_getattr_u16(tb[TCA_VLAN_PUSH_VLAN_ID]);
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			print_uint(PRINT_ANY, "id", " id %u", val);
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		}
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		if (tb[TCA_VLAN_PUSH_VLAN_PROTOCOL]) {
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			__u16 proto;
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			proto = rta_getattr_u16(tb[TCA_VLAN_PUSH_VLAN_PROTOCOL]);
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			print_string(PRINT_ANY, "protocol", " protocol %s",
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				     ll_proto_n2a(proto, b1, sizeof(b1)));
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		}
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		if (tb[TCA_VLAN_PUSH_VLAN_PRIORITY]) {
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			val = rta_getattr_u8(tb[TCA_VLAN_PUSH_VLAN_PRIORITY]);
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			print_uint(PRINT_ANY, "priority", " priority %u", val);
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		}
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		break;
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	}
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	print_action_control(f, " ", parm->action, "");
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	print_nl();
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	print_uint(PRINT_ANY, "index", "\t index %u", parm->index);
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	print_int(PRINT_ANY, "ref", " ref %d", parm->refcnt);
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	print_int(PRINT_ANY, "bind", " bind %d", parm->bindcnt);
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	if (show_stats) {
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		if (tb[TCA_VLAN_TM]) {
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			struct tcf_t *tm = RTA_DATA(tb[TCA_VLAN_TM]);
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			print_tm(f, tm);
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		}
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	}
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	print_nl();
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	return 0;
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}
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struct action_util vlan_action_util = {
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	.id = "vlan",
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	.parse_aopt = parse_vlan,
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	.print_aopt = print_vlan,
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};