Blame tc/tc_qdisc.c

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/*
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 * tc_qdisc.c		"tc qdisc".
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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:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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 *		J Hadi Salim: Extension to ingress
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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 <fcntl.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <string.h>
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#include <math.h>
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#include <malloc.h>
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#include "utils.h"
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#include "tc_util.h"
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#include "tc_common.h"
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static int usage(void)
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{
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	fprintf(stderr,
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		"Usage: tc qdisc [ add | del | replace | change | show ] dev STRING\n"
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		"       [ handle QHANDLE ] [ root | ingress | clsact | parent CLASSID ]\n"
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		"       [ estimator INTERVAL TIME_CONSTANT ]\n"
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		"       [ stab [ help | STAB_OPTIONS] ]\n"
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		"       [ ingress_block BLOCK_INDEX ] [ egress_block BLOCK_INDEX ]\n"
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		"       [ [ QDISC_KIND ] [ help | OPTIONS ] ]\n"
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		"\n"
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		"       tc qdisc { show | list } [ dev STRING ] [ QDISC_ID ] [ invisible ]\n"
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		"Where:\n"
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		"QDISC_KIND := { [p|b]fifo | tbf | prio | cbq | red | etc. }\n"
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		"OPTIONS := ... try tc qdisc add <desired QDISC_KIND> help\n"
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		"STAB_OPTIONS := ... try tc qdisc add stab help\n"
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		"QDISC_ID := { root | ingress | handle QHANDLE | parent CLASSID }\n");
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	return -1;
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}
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static int tc_qdisc_modify(int cmd, unsigned int flags, int argc, char **argv)
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{
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	struct qdisc_util *q = NULL;
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	struct tc_estimator est = {};
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	struct {
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		struct tc_sizespec	szopts;
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		__u16			*data;
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	} stab = {};
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	char  d[IFNAMSIZ] = {};
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	char  k[FILTER_NAMESZ] = {};
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	struct {
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		struct nlmsghdr	n;
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		struct tcmsg		t;
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		char			buf[TCA_BUF_MAX];
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	} req = {
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		.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg)),
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		.n.nlmsg_flags = NLM_F_REQUEST | flags,
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		.n.nlmsg_type = cmd,
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		.t.tcm_family = AF_UNSPEC,
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	};
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	__u32 ingress_block = 0;
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	__u32 egress_block = 0;
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	while (argc > 0) {
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		if (strcmp(*argv, "dev") == 0) {
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			NEXT_ARG();
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			if (d[0])
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				duparg("dev", *argv);
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			strncpy(d, *argv, sizeof(d)-1);
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		} else if (strcmp(*argv, "handle") == 0) {
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			__u32 handle;
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			if (req.t.tcm_handle)
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				duparg("handle", *argv);
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			NEXT_ARG();
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			if (get_qdisc_handle(&handle, *argv))
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				invarg("invalid qdisc ID", *argv);
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			req.t.tcm_handle = handle;
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		} else if (strcmp(*argv, "root") == 0) {
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			if (req.t.tcm_parent) {
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				fprintf(stderr, "Error: \"root\" is duplicate parent ID\n");
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				return -1;
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			}
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			req.t.tcm_parent = TC_H_ROOT;
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		} else if (strcmp(*argv, "clsact") == 0) {
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			if (req.t.tcm_parent) {
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				fprintf(stderr, "Error: \"clsact\" is a duplicate parent ID\n");
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				return -1;
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			}
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			req.t.tcm_parent = TC_H_CLSACT;
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			strncpy(k, "clsact", sizeof(k) - 1);
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			q = get_qdisc_kind(k);
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			req.t.tcm_handle = TC_H_MAKE(TC_H_CLSACT, 0);
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			NEXT_ARG_FWD();
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			break;
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		} else if (strcmp(*argv, "ingress") == 0) {
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			if (req.t.tcm_parent) {
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				fprintf(stderr, "Error: \"ingress\" is a duplicate parent ID\n");
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				return -1;
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			}
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			req.t.tcm_parent = TC_H_INGRESS;
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			strncpy(k, "ingress", sizeof(k) - 1);
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			q = get_qdisc_kind(k);
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			req.t.tcm_handle = TC_H_MAKE(TC_H_INGRESS, 0);
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			NEXT_ARG_FWD();
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			break;
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		} else if (strcmp(*argv, "parent") == 0) {
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			__u32 handle;
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			NEXT_ARG();
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			if (req.t.tcm_parent)
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				duparg("parent", *argv);
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			if (get_tc_classid(&handle, *argv))
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				invarg("invalid parent ID", *argv);
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			req.t.tcm_parent = handle;
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		} else if (matches(*argv, "estimator") == 0) {
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			if (parse_estimator(&argc, &argv, &est))
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				return -1;
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		} else if (matches(*argv, "stab") == 0) {
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			if (parse_size_table(&argc, &argv, &stab.szopts) < 0)
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				return -1;
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			continue;
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		} else if (matches(*argv, "ingress_block") == 0) {
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			NEXT_ARG();
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			if (get_u32(&ingress_block, *argv, 0) || !ingress_block)
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				invarg("invalid ingress block index value", *argv);
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		} else if (matches(*argv, "egress_block") == 0) {
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			NEXT_ARG();
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			if (get_u32(&egress_block, *argv, 0) || !egress_block)
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				invarg("invalid egress block index value", *argv);
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		} else if (matches(*argv, "help") == 0) {
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			usage();
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		} else {
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			strncpy(k, *argv, sizeof(k)-1);
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			q = get_qdisc_kind(k);
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			argc--; argv++;
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			break;
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		}
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		argc--; argv++;
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	}
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	if (k[0])
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		addattr_l(&req.n, sizeof(req), TCA_KIND, k, strlen(k)+1);
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	if (est.ewma_log)
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		addattr_l(&req.n, sizeof(req), TCA_RATE, &est, sizeof(est));
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	if (ingress_block)
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		addattr32(&req.n, sizeof(req),
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			  TCA_INGRESS_BLOCK, ingress_block);
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	if (egress_block)
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		addattr32(&req.n, sizeof(req),
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			  TCA_EGRESS_BLOCK, egress_block);
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	if (q) {
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		if (q->parse_qopt) {
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			if (q->parse_qopt(q, argc, argv, &req.n, d))
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				return 1;
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		} else if (argc) {
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			fprintf(stderr, "qdisc '%s' does not support option parsing\n", k);
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			return -1;
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		}
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	} else {
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		if (argc) {
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			if (matches(*argv, "help") == 0)
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				usage();
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			fprintf(stderr, "Garbage instead of arguments \"%s ...\". Try \"tc qdisc help\".\n", *argv);
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			return -1;
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		}
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	}
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	if (check_size_table_opts(&stab.szopts)) {
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		struct rtattr *tail;
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		if (tc_calc_size_table(&stab.szopts, &stab.data) < 0) {
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			fprintf(stderr, "failed to calculate size table.\n");
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			return -1;
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		}
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		tail = addattr_nest(&req.n, sizeof(req), TCA_STAB);
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		addattr_l(&req.n, sizeof(req), TCA_STAB_BASE, &stab.szopts,
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			  sizeof(stab.szopts));
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		if (stab.data)
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			addattr_l(&req.n, sizeof(req), TCA_STAB_DATA, stab.data,
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				  stab.szopts.tsize * sizeof(__u16));
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		addattr_nest_end(&req.n, tail);
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		if (stab.data)
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			free(stab.data);
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	}
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	if (d[0])  {
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		int idx;
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		ll_init_map(&rth);
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		idx = ll_name_to_index(d);
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		if (!idx)
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			return -nodev(d);
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		req.t.tcm_ifindex = idx;
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	}
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	if (rtnl_talk(&rth, &req.n, NULL) < 0)
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		return 2;
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	return 0;
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}
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static int filter_ifindex;
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static __u32 filter_parent;
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static __u32 filter_handle;
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int print_qdisc(struct nlmsghdr *n, void *arg)
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{
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	FILE *fp = (FILE *)arg;
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	struct tcmsg *t = NLMSG_DATA(n);
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	int len = n->nlmsg_len;
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	struct rtattr *tb[TCA_MAX+1];
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	struct qdisc_util *q;
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	char abuf[256];
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	if (n->nlmsg_type != RTM_NEWQDISC && n->nlmsg_type != RTM_DELQDISC) {
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		fprintf(stderr, "Not a qdisc\n");
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		return 0;
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	}
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	len -= NLMSG_LENGTH(sizeof(*t));
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	if (len < 0) {
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		fprintf(stderr, "Wrong len %d\n", len);
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		return -1;
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	}
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	if (filter_ifindex && filter_ifindex != t->tcm_ifindex)
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		return 0;
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	if (filter_handle && filter_handle != t->tcm_handle)
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		return 0;
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	if (filter_parent && filter_parent != t->tcm_parent)
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		return 0;
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	parse_rtattr_flags(tb, TCA_MAX, TCA_RTA(t), len, NLA_F_NESTED);
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	if (tb[TCA_KIND] == NULL) {
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		fprintf(stderr, "print_qdisc: NULL kind\n");
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		return -1;
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	}
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	open_json_object(NULL);
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	if (n->nlmsg_type == RTM_DELQDISC)
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		print_bool(PRINT_ANY, "deleted", "deleted ", true);
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	if (n->nlmsg_type == RTM_NEWQDISC &&
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			(n->nlmsg_flags & NLM_F_CREATE) &&
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			(n->nlmsg_flags & NLM_F_REPLACE))
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		print_bool(PRINT_ANY, "replaced", "replaced ", true);
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	if (n->nlmsg_type == RTM_NEWQDISC &&
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			(n->nlmsg_flags & NLM_F_CREATE) &&
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			(n->nlmsg_flags & NLM_F_EXCL))
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		print_bool(PRINT_ANY, "added", "added ", true);
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	print_string(PRINT_ANY, "kind", "qdisc %s",
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		     rta_getattr_str(tb[TCA_KIND]));
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	sprintf(abuf, "%x:", t->tcm_handle >> 16);
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	print_string(PRINT_ANY, "handle", " %s", abuf);
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	if (show_raw) {
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		sprintf(abuf, "[%08x]", t->tcm_handle);
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		print_string(PRINT_FP, NULL, "%s", abuf);
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	}
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	print_string(PRINT_FP, NULL, " ", NULL);
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	if (filter_ifindex == 0)
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		print_devname(PRINT_ANY, t->tcm_ifindex);
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	if (t->tcm_parent == TC_H_ROOT)
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		print_bool(PRINT_ANY, "root", "root ", true);
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	else if (t->tcm_parent) {
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		print_tc_classid(abuf, sizeof(abuf), t->tcm_parent);
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		print_string(PRINT_ANY, "parent", "parent %s ", abuf);
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	}
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	if (t->tcm_info != 1)
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		print_uint(PRINT_ANY, "refcnt", "refcnt %u ", t->tcm_info);
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	if (tb[TCA_HW_OFFLOAD] &&
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	    (rta_getattr_u8(tb[TCA_HW_OFFLOAD])))
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		print_bool(PRINT_ANY, "offloaded", "offloaded ", true);
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	if (tb[TCA_INGRESS_BLOCK] &&
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	    RTA_PAYLOAD(tb[TCA_INGRESS_BLOCK]) >= sizeof(__u32)) {
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		__u32 block = rta_getattr_u32(tb[TCA_INGRESS_BLOCK]);
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		if (block)
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			print_uint(PRINT_ANY, "ingress_block",
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				   "ingress_block %u ", block);
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	}
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	if (tb[TCA_EGRESS_BLOCK] &&
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	    RTA_PAYLOAD(tb[TCA_EGRESS_BLOCK]) >= sizeof(__u32)) {
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		__u32 block = rta_getattr_u32(tb[TCA_EGRESS_BLOCK]);
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		if (block)
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			print_uint(PRINT_ANY, "egress_block",
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				   "egress_block %u ", block);
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	}
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	/* pfifo_fast is generic enough to warrant the hardcoding --JHS */
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	if (strcmp("pfifo_fast", RTA_DATA(tb[TCA_KIND])) == 0)
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		q = get_qdisc_kind("prio");
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	else
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		q = get_qdisc_kind(RTA_DATA(tb[TCA_KIND]));
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	open_json_object("options");
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	if (tb[TCA_OPTIONS]) {
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		if (q)
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			q->print_qopt(q, fp, tb[TCA_OPTIONS]);
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		else
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			fprintf(stderr, "Cannot parse qdisc parameters\n");
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	}
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	close_json_object();
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	print_nl();
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	if (show_details && tb[TCA_STAB]) {
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		print_size_table(fp, " ", tb[TCA_STAB]);
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		print_nl();
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	}
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	if (show_stats) {
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		struct rtattr *xstats = NULL;
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		if (tb[TCA_STATS] || tb[TCA_STATS2] || tb[TCA_XSTATS]) {
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			print_tcstats_attr(fp, tb, " ", &xstats);
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			print_nl();
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		}
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		if (q && xstats && q->print_xstats) {
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			q->print_xstats(q, fp, xstats);
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			print_nl();
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		}
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	}
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	close_json_object();
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	fflush(fp);
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	return 0;
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}
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static int tc_qdisc_list(int argc, char **argv)
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{
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	struct {
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		struct nlmsghdr n;
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		struct tcmsg t;
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		char buf[256];
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	} req = {
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		.n.nlmsg_type = RTM_GETQDISC,
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		.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg)),
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		.t.tcm_family = AF_UNSPEC,
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	};
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	char d[IFNAMSIZ] = {};
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	bool dump_invisible = false;
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	__u32 handle;
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	while (argc > 0) {
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		if (strcmp(*argv, "dev") == 0) {
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			NEXT_ARG();
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			strncpy(d, *argv, sizeof(d)-1);
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		} else if (strcmp(*argv, "root") == 0) {
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			if (filter_parent)
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				invarg("parent is already specified", *argv);
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			else if (filter_handle)
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				invarg("handle is already specified", *argv);
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			filter_parent = TC_H_ROOT;
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		} else if (strcmp(*argv, "ingress") == 0 ||
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				strcmp(*argv, "clsact") == 0) {
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			if (filter_parent)
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				invarg("parent is already specified", *argv);
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			else if (filter_handle)
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				invarg("handle is already specified", *argv);
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			filter_parent = TC_H_INGRESS;
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		} else if (matches(*argv, "parent") == 0) {
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			if (filter_parent)
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				invarg("parent is already specified", *argv);
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			else if (filter_handle)
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				invarg("handle is already specified", *argv);
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			NEXT_ARG();
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			if (get_tc_classid(&handle, *argv))
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				invarg("invalid parent ID", *argv);
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			filter_parent = handle;
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		} else if (matches(*argv, "handle") == 0) {
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			if (filter_parent)
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				invarg("parent is already specified", *argv);
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			else if (filter_handle)
Packit Service 3880ab
				invarg("handle is already specified", *argv);
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			NEXT_ARG();
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			if (get_qdisc_handle(&handle, *argv))
Packit Service 3880ab
				invarg("invalid handle ID", *argv);
Packit Service 3880ab
			filter_handle = handle;
Packit Service 3880ab
		} else if (matches(*argv, "help") == 0) {
Packit Service 3880ab
			usage();
Packit Service 3880ab
		} else if (strcmp(*argv, "invisible") == 0) {
Packit Service 3880ab
			dump_invisible = true;
Packit Service 3880ab
		} else {
Packit Service 3880ab
			fprintf(stderr, "What is \"%s\"? Try \"tc qdisc help\".\n", *argv);
Packit Service 3880ab
			return -1;
Packit Service 3880ab
		}
Packit Service 3880ab
Packit Service 3880ab
		argc--; argv++;
Packit Service 3880ab
	}
Packit Service 3880ab
Packit Service 3880ab
	ll_init_map(&rth);
Packit Service 3880ab
Packit Service 3880ab
	if (d[0]) {
Packit Service 3880ab
		req.t.tcm_ifindex = ll_name_to_index(d);
Packit Service 3880ab
		if (!req.t.tcm_ifindex)
Packit Service 3880ab
			return -nodev(d);
Packit Service 3880ab
		filter_ifindex = req.t.tcm_ifindex;
Packit Service 3880ab
	}
Packit Service 3880ab
Packit Service 3880ab
	if (dump_invisible) {
Packit Service 3880ab
		addattr(&req.n, 256, TCA_DUMP_INVISIBLE);
Packit Service 3880ab
	}
Packit Service 3880ab
Packit Service 3880ab
	if (rtnl_dump_request_n(&rth, &req.n) < 0) {
Packit Service 3880ab
		perror("Cannot send request");
Packit Service 3880ab
		return 1;
Packit Service 3880ab
	}
Packit Service 3880ab
Packit Service 3880ab
	new_json_obj(json);
Packit Service 3880ab
	if (rtnl_dump_filter(&rth, print_qdisc, stdout) < 0) {
Packit Service 3880ab
		fprintf(stderr, "Dump terminated\n");
Packit Service 3880ab
		return 1;
Packit Service 3880ab
	}
Packit Service 3880ab
	delete_json_obj();
Packit Service 3880ab
Packit Service 3880ab
	return 0;
Packit Service 3880ab
}
Packit Service 3880ab
Packit Service 3880ab
int do_qdisc(int argc, char **argv)
Packit Service 3880ab
{
Packit Service 3880ab
	if (argc < 1)
Packit Service 3880ab
		return tc_qdisc_list(0, NULL);
Packit Service 3880ab
	if (matches(*argv, "add") == 0)
Packit Service 3880ab
		return tc_qdisc_modify(RTM_NEWQDISC, NLM_F_EXCL|NLM_F_CREATE, argc-1, argv+1);
Packit Service 3880ab
	if (matches(*argv, "change") == 0)
Packit Service 3880ab
		return tc_qdisc_modify(RTM_NEWQDISC, 0, argc-1, argv+1);
Packit Service 3880ab
	if (matches(*argv, "replace") == 0)
Packit Service 3880ab
		return tc_qdisc_modify(RTM_NEWQDISC, NLM_F_CREATE|NLM_F_REPLACE, argc-1, argv+1);
Packit Service 3880ab
	if (matches(*argv, "link") == 0)
Packit Service 3880ab
		return tc_qdisc_modify(RTM_NEWQDISC, NLM_F_REPLACE, argc-1, argv+1);
Packit Service 3880ab
	if (matches(*argv, "delete") == 0)
Packit Service 3880ab
		return tc_qdisc_modify(RTM_DELQDISC, 0,  argc-1, argv+1);
Packit Service 3880ab
	if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0
Packit Service 3880ab
	    || matches(*argv, "lst") == 0)
Packit Service 3880ab
		return tc_qdisc_list(argc-1, argv+1);
Packit Service 3880ab
	if (matches(*argv, "help") == 0) {
Packit Service 3880ab
		usage();
Packit Service 3880ab
		return 0;
Packit Service 3880ab
	}
Packit Service 3880ab
	fprintf(stderr, "Command \"%s\" is unknown, try \"tc qdisc help\".\n", *argv);
Packit Service 3880ab
	return -1;
Packit Service 3880ab
}
Packit Service 3880ab
Packit Service 3880ab
struct tc_qdisc_block_exists_ctx {
Packit Service 3880ab
	__u32 block_index;
Packit Service 3880ab
	bool found;
Packit Service 3880ab
};
Packit Service 3880ab
Packit Service 3880ab
static int tc_qdisc_block_exists_cb(struct nlmsghdr *n, void *arg)
Packit Service 3880ab
{
Packit Service 3880ab
	struct tc_qdisc_block_exists_ctx *ctx = arg;
Packit Service 3880ab
	struct tcmsg *t = NLMSG_DATA(n);
Packit Service 3880ab
	struct rtattr *tb[TCA_MAX+1];
Packit Service 3880ab
	int len = n->nlmsg_len;
Packit Service 3880ab
	struct qdisc_util *q;
Packit Service 3880ab
	const char *kind;
Packit Service 3880ab
	int err;
Packit Service 3880ab
Packit Service 3880ab
	if (n->nlmsg_type != RTM_NEWQDISC)
Packit Service 3880ab
		return 0;
Packit Service 3880ab
Packit Service 3880ab
	len -= NLMSG_LENGTH(sizeof(*t));
Packit Service 3880ab
	if (len < 0)
Packit Service 3880ab
		return -1;
Packit Service 3880ab
Packit Service 3880ab
	parse_rtattr_flags(tb, TCA_MAX, TCA_RTA(t), len, NLA_F_NESTED);
Packit Service 3880ab
Packit Service 3880ab
	if (tb[TCA_KIND] == NULL)
Packit Service 3880ab
		return -1;
Packit Service 3880ab
Packit Service 3880ab
	if (tb[TCA_INGRESS_BLOCK] &&
Packit Service 3880ab
	    RTA_PAYLOAD(tb[TCA_INGRESS_BLOCK]) >= sizeof(__u32)) {
Packit Service 3880ab
		__u32 block = rta_getattr_u32(tb[TCA_INGRESS_BLOCK]);
Packit Service 3880ab
Packit Service 3880ab
		if (block == ctx->block_index)
Packit Service 3880ab
			ctx->found = true;
Packit Service 3880ab
	}
Packit Service 3880ab
Packit Service 3880ab
	if (tb[TCA_EGRESS_BLOCK] &&
Packit Service 3880ab
	    RTA_PAYLOAD(tb[TCA_EGRESS_BLOCK]) >= sizeof(__u32)) {
Packit Service 3880ab
		__u32 block = rta_getattr_u32(tb[TCA_EGRESS_BLOCK]);
Packit Service 3880ab
Packit Service 3880ab
		if (block == ctx->block_index)
Packit Service 3880ab
			ctx->found = true;
Packit Service 3880ab
	}
Packit Service 3880ab
Packit Service 3880ab
	kind = rta_getattr_str(tb[TCA_KIND]);
Packit Service 3880ab
	q = get_qdisc_kind(kind);
Packit Service 3880ab
	if (!q)
Packit Service 3880ab
		return -1;
Packit Service 3880ab
	if (q->has_block) {
Packit Service 3880ab
		bool found = false;
Packit Service 3880ab
Packit Service 3880ab
		err = q->has_block(q, tb[TCA_OPTIONS], ctx->block_index, &found);
Packit Service 3880ab
		if (err)
Packit Service 3880ab
			return err;
Packit Service 3880ab
		if (found)
Packit Service 3880ab
			ctx->found = true;
Packit Service 3880ab
	}
Packit Service 3880ab
Packit Service 3880ab
	return 0;
Packit Service 3880ab
}
Packit Service 3880ab
Packit Service 3880ab
bool tc_qdisc_block_exists(__u32 block_index)
Packit Service 3880ab
{
Packit Service 3880ab
	struct tc_qdisc_block_exists_ctx ctx = { .block_index = block_index };
Packit Service 3880ab
	struct tcmsg t = { .tcm_family = AF_UNSPEC };
Packit Service 3880ab
Packit Service 3880ab
	if (rtnl_dump_request(&rth, RTM_GETQDISC, &t, sizeof(t)) < 0) {
Packit Service 3880ab
		perror("Cannot send dump request");
Packit Service 3880ab
		return false;
Packit Service 3880ab
	}
Packit Service 3880ab
Packit Service 3880ab
	if (rtnl_dump_filter(&rth, tc_qdisc_block_exists_cb, &ctx) < 0) {
Packit Service 3880ab
		perror("Dump terminated\n");
Packit Service 3880ab
		return false;
Packit Service 3880ab
	}
Packit Service 3880ab
Packit Service 3880ab
	return ctx.found;
Packit Service 3880ab
}