[mirror_iproute2.git] / tc / tc_qdisc.c

/*
 * tc_qdisc.c		"tc qdisc".
 *
 *		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:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
 *		J Hadi Salim: Extension to ingress
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <syslog.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
#include <math.h>

#include "utils.h"
#include "tc_util.h"
#include "tc_common.h"

static int usage(void);

static int usage(void)
{
	fprintf(stderr, "Usage: tc qdisc [ add | del | replace | change | get ] dev STRING\n");
	fprintf(stderr, "       [ handle QHANDLE ] [ root | ingress | parent CLASSID ]\n");
	fprintf(stderr, "       [ estimator INTERVAL TIME_CONSTANT ]\n");
	fprintf(stderr, "       [ [ QDISC_KIND ] [ help | OPTIONS ] ]\n");
	fprintf(stderr, "\n");
	fprintf(stderr, "       tc qdisc show [ dev STRING ] [ingress]\n");
	fprintf(stderr, "Where:\n");
	fprintf(stderr, "QDISC_KIND := { [p|b]fifo | tbf | prio | cbq | red | etc. }\n");
	fprintf(stderr, "OPTIONS := ... try tc qdisc add <desired QDISC_KIND> help\n");
	return -1;
}

int tc_qdisc_modify(int cmd, unsigned flags, int argc, char **argv)
{
	struct qdisc_util *q = NULL;
	struct tc_estimator est;
	char  d[16];
	char  k[16];
	struct {
		struct nlmsghdr 	n;
		struct tcmsg 		t;
		char   			buf[TCA_BUF_MAX];
	} req;

	memset(&req, 0, sizeof(req));
	memset(&est, 0, sizeof(est));
	memset(&d, 0, sizeof(d));
	memset(&k, 0, sizeof(k));

	req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg));
	req.n.nlmsg_flags = NLM_F_REQUEST|flags;
	req.n.nlmsg_type = cmd;
	req.t.tcm_family = AF_UNSPEC;

	while (argc > 0) {
		if (strcmp(*argv, "dev") == 0) {
			NEXT_ARG();
			if (d[0])
				duparg("dev", *argv);
			strncpy(d, *argv, sizeof(d)-1);
		} else if (strcmp(*argv, "handle") == 0) {
			__u32 handle;
			if (req.t.tcm_handle)
				duparg("handle", *argv);
			NEXT_ARG();
			if (get_qdisc_handle(&handle, *argv))
				invarg(*argv, "invalid qdisc ID");
			req.t.tcm_handle = handle;
		} else if (strcmp(*argv, "root") == 0) {
			if (req.t.tcm_parent) {
				fprintf(stderr, "Error: \"root\" is duplicate parent ID\n");
				return -1;
			}
			req.t.tcm_parent = TC_H_ROOT;
#ifdef TC_H_INGRESS
		} else if (strcmp(*argv, "ingress") == 0) {
			if (req.t.tcm_parent) {
				fprintf(stderr, "Error: \"ingress\" is a duplicate parent ID\n");
				return -1;
			}
			req.t.tcm_parent = TC_H_INGRESS;
			strncpy(k, "ingress", sizeof(k)-1);
			q = get_qdisc_kind(k);
			req.t.tcm_handle = 0xffff0000;

			argc--; argv++;
			break;
#endif
		} else if (strcmp(*argv, "parent") == 0) {
			__u32 handle;
			NEXT_ARG();
			if (req.t.tcm_parent)
				duparg("parent", *argv);
			if (get_tc_classid(&handle, *argv))
				invarg(*argv, "invalid parent ID");
			req.t.tcm_parent = handle;
		} else if (matches(*argv, "estimator") == 0) {
			if (parse_estimator(&argc, &argv, &est))
				return -1;
		} else if (matches(*argv, "help") == 0) {
			usage();
		} else {
			strncpy(k, *argv, sizeof(k)-1);

			q = get_qdisc_kind(k);
			argc--; argv++;
			break;
		}
		argc--; argv++;
	}

	if (k[0])
		addattr_l(&req.n, sizeof(req), TCA_KIND, k, strlen(k)+1);
	if (est.ewma_log)
		addattr_l(&req.n, sizeof(req), TCA_RATE, &est, sizeof(est));

	if (q) {
		if (q->parse_qopt(q, argc, argv, &req.n))
			return 1;
	} else {
		if (argc) {
			if (matches(*argv, "help") == 0)
				usage();

			fprintf(stderr, "Garbage instead of arguments \"%s ...\". Try \"tc qdisc help\".\n", *argv);
			return -1;
		}
	}

	if (d[0])  {
		int idx;

 		ll_init_map(&rth);

		if ((idx = ll_name_to_index(d)) == 0) {
			fprintf(stderr, "Cannot find device \"%s\"\n", d);
			return 1;
		}
		req.t.tcm_ifindex = idx;
	}

 	if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0) 
		return 2;

	return 0;
}

static int filter_ifindex;

static int print_qdisc(const struct sockaddr_nl *who, 
		       struct nlmsghdr *n, 
		       void *arg)
{
	FILE *fp = (FILE*)arg;
	struct tcmsg *t = NLMSG_DATA(n);
	int len = n->nlmsg_len;
	struct rtattr * tb[TCA_MAX+1];
	struct qdisc_util *q;
	char abuf[256];

	if (n->nlmsg_type != RTM_NEWQDISC && n->nlmsg_type != RTM_DELQDISC) {
		fprintf(stderr, "Not a qdisc\n");
		return 0;
	}
	len -= NLMSG_LENGTH(sizeof(*t));
	if (len < 0) {
		fprintf(stderr, "Wrong len %d\n", len);
		return -1;
	}

	if (filter_ifindex && filter_ifindex != t->tcm_ifindex)
		return 0;

	memset(tb, 0, sizeof(tb));
	parse_rtattr(tb, TCA_MAX, TCA_RTA(t), len);

	if (tb[TCA_KIND] == NULL) {
		fprintf(stderr, "print_qdisc: NULL kind\n");
		return -1;
	}

	if (n->nlmsg_type == RTM_DELQDISC)
		fprintf(fp, "deleted ");

	fprintf(fp, "qdisc %s %x: ", (char*)RTA_DATA(tb[TCA_KIND]), t->tcm_handle>>16);
	if (filter_ifindex == 0)
		fprintf(fp, "dev %s ", ll_index_to_name(t->tcm_ifindex));
	if (t->tcm_parent == TC_H_ROOT)
		fprintf(fp, "root ");
	else if (t->tcm_parent) {
		print_tc_classid(abuf, sizeof(abuf), t->tcm_parent);
		fprintf(fp, "parent %s ", abuf);
	}
	if (t->tcm_info != 1) {
		fprintf(fp, "refcnt %d ", t->tcm_info);
	}
	/* pfifo_fast is generic enough to warrant the hardcoding --JHS */	
		
	if (0 == strcmp("pfifo_fast", RTA_DATA(tb[TCA_KIND])))
		q = get_qdisc_kind("prio");
	else
		q = get_qdisc_kind(RTA_DATA(tb[TCA_KIND]));
	
	if (tb[TCA_OPTIONS]) {
		if (q)
			q->print_qopt(q, fp, tb[TCA_OPTIONS]);
		else
			fprintf(fp, "[cannot parse qdisc parameters]");
	}
	fprintf(fp, "\n");
	if (show_stats) {
		struct rtattr *xstats = NULL;

		if (tb[TCA_STATS] || tb[TCA_STATS2] || tb[TCA_XSTATS]) {
			print_tcstats_attr(fp, tb, " ", &xstats);
			fprintf(fp, "\n");
		}

		if (q && xstats && q->print_xstats) {
			q->print_xstats(q, fp, xstats);
			fprintf(fp, "\n");
		}
	}
	fflush(fp);
	return 0;
}


int tc_qdisc_list(int argc, char **argv)
{
	struct tcmsg t;
	char d[16];

	memset(&t, 0, sizeof(t));
	t.tcm_family = AF_UNSPEC;
	memset(&d, 0, sizeof(d));
	
	while (argc > 0) {
		if (strcmp(*argv, "dev") == 0) {
			NEXT_ARG();
			strncpy(d, *argv, sizeof(d)-1);
#ifdef TC_H_INGRESS
                } else if (strcmp(*argv, "ingress") == 0) {
                             if (t.tcm_parent) {
                                     fprintf(stderr, "Duplicate parent ID\n");
                                     usage();
                             }
                             t.tcm_parent = TC_H_INGRESS;
#endif
		} else if (matches(*argv, "help") == 0) {
			usage();
		} else {
			fprintf(stderr, "What is \"%s\"? Try \"tc qdisc help\".\n", *argv);
			return -1;
		}

		argc--; argv++;
	}

 	ll_init_map(&rth);

	if (d[0]) {
		if ((t.tcm_ifindex = ll_name_to_index(d)) == 0) {
			fprintf(stderr, "Cannot find device \"%s\"\n", d);
			return 1;
		}
		filter_ifindex = t.tcm_ifindex;
	}

 	if (rtnl_dump_request(&rth, RTM_GETQDISC, &t, sizeof(t)) < 0) {
		perror("Cannot send dump request");
		return 1;
	}

 	if (rtnl_dump_filter(&rth, print_qdisc, stdout, NULL, NULL) < 0) {
		fprintf(stderr, "Dump terminated\n");
		return 1;
	}

	return 0;
}

int do_qdisc(int argc, char **argv)
{
	if (argc < 1)
		return tc_qdisc_list(0, NULL);
	if (matches(*argv, "add") == 0)
		return tc_qdisc_modify(RTM_NEWQDISC, NLM_F_EXCL|NLM_F_CREATE, argc-1, argv+1);
	if (matches(*argv, "change") == 0)
		return tc_qdisc_modify(RTM_NEWQDISC, 0, argc-1, argv+1);
	if (matches(*argv, "replace") == 0)
		return tc_qdisc_modify(RTM_NEWQDISC, NLM_F_CREATE|NLM_F_REPLACE, argc-1, argv+1);
	if (matches(*argv, "link") == 0)
		return tc_qdisc_modify(RTM_NEWQDISC, NLM_F_REPLACE, argc-1, argv+1);
	if (matches(*argv, "delete") == 0)
		return tc_qdisc_modify(RTM_DELQDISC, 0,  argc-1, argv+1);
#if 0
	if (matches(*argv, "get") == 0)
		return tc_qdisc_get(RTM_GETQDISC, 0,  argc-1, argv+1);
#endif
	if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0
	    || matches(*argv, "lst") == 0)
		return tc_qdisc_list(argc-1, argv+1);
	if (matches(*argv, "help") == 0)
		usage();
	fprintf(stderr, "Command \"%s\" is unknown, try \"tc qdisc help\".\n", *argv);
	return -1;
}
Commit	Line	Data
aba5acdf SH	1	/*
	2	* tc_qdisc.c "tc qdisc".
	3	*
	4	* This program is free software; you can redistribute it and/or
	5	* modify it under the terms of the GNU General Public License
	6	* as published by the Free Software Foundation; either version
	7	* 2 of the License, or (at your option) any later version.
	8	*
	9	* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
	10	* J Hadi Salim: Extension to ingress
	11	*/
	12
	13	#include <stdio.h>
	14	#include <stdlib.h>
	15	#include <unistd.h>
	16	#include <syslog.h>
	17	#include <fcntl.h>
	18	#include <sys/socket.h>
	19	#include <netinet/in.h>
	20	#include <arpa/inet.h>
	21	#include <string.h>
	22	#include <math.h>
	23
	24	#include "utils.h"
	25	#include "tc_util.h"
	26	#include "tc_common.h"
	27
11656f1b	28	static int usage(void);
aba5acdf	29
11656f1b	30	static int usage(void)
aba5acdf SH	31	{
	32	fprintf(stderr, "Usage: tc qdisc [ add \| del \| replace \| change \| get ] dev STRING\n");
	33	fprintf(stderr, " [ handle QHANDLE ] [ root \| ingress \| parent CLASSID ]\n");
	34	fprintf(stderr, " [ estimator INTERVAL TIME_CONSTANT ]\n");
	35	fprintf(stderr, " [ [ QDISC_KIND ] [ help \| OPTIONS ] ]\n");
	36	fprintf(stderr, "\n");
	37	fprintf(stderr, " tc qdisc show [ dev STRING ] [ingress]\n");
	38	fprintf(stderr, "Where:\n");
	39	fprintf(stderr, "QDISC_KIND := { [p\|b]fifo \| tbf \| prio \| cbq \| red \| etc. }\n");
	40	fprintf(stderr, "OPTIONS := ... try tc qdisc add <desired QDISC_KIND> help\n");
11656f1b	41	return -1;
aba5acdf SH	42	}
	43
	44	int tc_qdisc_modify(int cmd, unsigned flags, int argc, char **argv)
	45	{
aba5acdf SH	46	struct qdisc_util *q = NULL;
	47	struct tc_estimator est;
	48	char d[16];
	49	char k[16];
f307c24e SH	50	struct {
	51	struct nlmsghdr n;
	52	struct tcmsg t;
	53	char buf[TCA_BUF_MAX];
	54	} req;
aba5acdf SH	55
	56	memset(&req, 0, sizeof(req));
	57	memset(&est, 0, sizeof(est));
	58	memset(&d, 0, sizeof(d));
	59	memset(&k, 0, sizeof(k));
	60
	61	req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg));
	62	req.n.nlmsg_flags = NLM_F_REQUEST\|flags;
	63	req.n.nlmsg_type = cmd;
	64	req.t.tcm_family = AF_UNSPEC;
	65
	66	while (argc > 0) {
	67	if (strcmp(*argv, "dev") == 0) {
	68	NEXT_ARG();
	69	if (d[0])
	70	duparg("dev", *argv);
	71	strncpy(d, *argv, sizeof(d)-1);
	72	} else if (strcmp(*argv, "handle") == 0) {
	73	__u32 handle;
	74	if (req.t.tcm_handle)
	75	duparg("handle", *argv);
	76	NEXT_ARG();
	77	if (get_qdisc_handle(&handle, *argv))
	78	invarg(*argv, "invalid qdisc ID");
	79	req.t.tcm_handle = handle;
	80	} else if (strcmp(*argv, "root") == 0) {
	81	if (req.t.tcm_parent) {
	82	fprintf(stderr, "Error: \"root\" is duplicate parent ID\n");
11656f1b	83	return -1;
aba5acdf SH	84	}
	85	req.t.tcm_parent = TC_H_ROOT;
	86	#ifdef TC_H_INGRESS
	87	} else if (strcmp(*argv, "ingress") == 0) {
	88	if (req.t.tcm_parent) {
	89	fprintf(stderr, "Error: \"ingress\" is a duplicate parent ID\n");
11656f1b	90	return -1;
aba5acdf SH	91	}
	92	req.t.tcm_parent = TC_H_INGRESS;
	93	strncpy(k, "ingress", sizeof(k)-1);
	94	q = get_qdisc_kind(k);
	95	req.t.tcm_handle = 0xffff0000;
	96
	97	argc--; argv++;
	98	break;
	99	#endif
	100	} else if (strcmp(*argv, "parent") == 0) {
	101	__u32 handle;
	102	NEXT_ARG();
	103	if (req.t.tcm_parent)
	104	duparg("parent", *argv);
	105	if (get_tc_classid(&handle, *argv))
	106	invarg(*argv, "invalid parent ID");
	107	req.t.tcm_parent = handle;
	108	} else if (matches(*argv, "estimator") == 0) {
	109	if (parse_estimator(&argc, &argv, &est))
	110	return -1;
	111	} else if (matches(*argv, "help") == 0) {
	112	usage();
	113	} else {
	114	strncpy(k, *argv, sizeof(k)-1);
	115
	116	q = get_qdisc_kind(k);
	117	argc--; argv++;
	118	break;
	119	}
	120	argc--; argv++;
	121	}
	122
	123	if (k[0])
	124	addattr_l(&req.n, sizeof(req), TCA_KIND, k, strlen(k)+1);
	125	if (est.ewma_log)
	126	addattr_l(&req.n, sizeof(req), TCA_RATE, &est, sizeof(est));
	127
	128	if (q) {
	129	if (q->parse_qopt(q, argc, argv, &req.n))
11656f1b	130	return 1;
aba5acdf SH	131	} else {
	132	if (argc) {
	133	if (matches(*argv, "help") == 0)
	134	usage();
	135
	136	fprintf(stderr, "Garbage instead of arguments \"%s ...\". Try \"tc qdisc help\".\n", *argv);
11656f1b	137	return -1;
aba5acdf SH	138	}
	139	}
	140
aba5acdf SH	141	if (d[0]) {
	142	int idx;
	143
7901660a	144	ll_init_map(&rth);
aba5acdf SH	145
	146	if ((idx = ll_name_to_index(d)) == 0) {
	147	fprintf(stderr, "Cannot find device \"%s\"\n", d);
11656f1b	148	return 1;
aba5acdf SH	149	}
	150	req.t.tcm_ifindex = idx;
	151	}
	152
7901660a	153	if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0)
11656f1b	154	return 2;
aba5acdf	155
aba5acdf SH	156	return 0;
	157	}
	158
aba5acdf SH	159	static int filter_ifindex;
aba5acdf SH	160
649b0755	161	static int print_qdisc(const struct sockaddr_nl *who,
50772dc5	162	struct nlmsghdr *n,
649b0755	163	void *arg)
aba5acdf SH	164	{
	165	FILE fp = (FILE)arg;
	166	struct tcmsg *t = NLMSG_DATA(n);
	167	int len = n->nlmsg_len;
	168	struct rtattr * tb[TCA_MAX+1];
	169	struct qdisc_util *q;
	170	char abuf[256];
	171
	172	if (n->nlmsg_type != RTM_NEWQDISC && n->nlmsg_type != RTM_DELQDISC) {
	173	fprintf(stderr, "Not a qdisc\n");
	174	return 0;
	175	}
	176	len -= NLMSG_LENGTH(sizeof(*t));
	177	if (len < 0) {
	178	fprintf(stderr, "Wrong len %d\n", len);
	179	return -1;
	180	}
	181
	182	if (filter_ifindex && filter_ifindex != t->tcm_ifindex)
	183	return 0;
	184
	185	memset(tb, 0, sizeof(tb));
	186	parse_rtattr(tb, TCA_MAX, TCA_RTA(t), len);
	187
	188	if (tb[TCA_KIND] == NULL) {
2373fde9	189	fprintf(stderr, "print_qdisc: NULL kind\n");
aba5acdf SH	190	return -1;
	191	}
	192
	193	if (n->nlmsg_type == RTM_DELQDISC)
	194	fprintf(fp, "deleted ");
	195
	196	fprintf(fp, "qdisc %s %x: ", (char*)RTA_DATA(tb[TCA_KIND]), t->tcm_handle>>16);
	197	if (filter_ifindex == 0)
	198	fprintf(fp, "dev %s ", ll_index_to_name(t->tcm_ifindex));
	199	if (t->tcm_parent == TC_H_ROOT)
	200	fprintf(fp, "root ");
	201	else if (t->tcm_parent) {
	202	print_tc_classid(abuf, sizeof(abuf), t->tcm_parent);
	203	fprintf(fp, "parent %s ", abuf);
	204	}
	205	if (t->tcm_info != 1) {
	206	fprintf(fp, "refcnt %d ", t->tcm_info);
	207	}
2373fde9 SH	208	/* pfifo_fast is generic enough to warrant the hardcoding --JHS */
	209
	210	if (0 == strcmp("pfifo_fast", RTA_DATA(tb[TCA_KIND])))
	211	q = get_qdisc_kind("prio");
	212	else
	213	q = get_qdisc_kind(RTA_DATA(tb[TCA_KIND]));
	214
aba5acdf SH	215	if (tb[TCA_OPTIONS]) {
	216	if (q)
	217	q->print_qopt(q, fp, tb[TCA_OPTIONS]);
	218	else
	219	fprintf(fp, "[cannot parse qdisc parameters]");
	220	}
	221	fprintf(fp, "\n");
	222	if (show_stats) {
e5879dc6	223	struct rtattr *xstats = NULL;
	224
	225	if (tb[TCA_STATS] \|\| tb[TCA_STATS2] \|\| tb[TCA_XSTATS]) {
	226	print_tcstats_attr(fp, tb, " ", &xstats);
649b0755	227	fprintf(fp, "\n");
aba5acdf	228	}
649b0755	229
e5879dc6	230	if (q && xstats && q->print_xstats) {
e5879dc6	231	q->print_xstats(q, fp, xstats);
aba5acdf SH	232	fprintf(fp, "\n");
	233	}
	234	}
	235	fflush(fp);
	236	return 0;
	237	}
	238
	239
	240	int tc_qdisc_list(int argc, char **argv)
	241	{
	242	struct tcmsg t;
aba5acdf SH	243	char d[16];
	244
	245	memset(&t, 0, sizeof(t));
	246	t.tcm_family = AF_UNSPEC;
	247	memset(&d, 0, sizeof(d));
	248
	249	while (argc > 0) {
	250	if (strcmp(*argv, "dev") == 0) {
	251	NEXT_ARG();
	252	strncpy(d, *argv, sizeof(d)-1);
	253	#ifdef TC_H_INGRESS
	254	} else if (strcmp(*argv, "ingress") == 0) {
	255	if (t.tcm_parent) {
	256	fprintf(stderr, "Duplicate parent ID\n");
	257	usage();
	258	}
	259	t.tcm_parent = TC_H_INGRESS;
	260	#endif
	261	} else if (matches(*argv, "help") == 0) {
	262	usage();
	263	} else {
	264	fprintf(stderr, "What is \"%s\"? Try \"tc qdisc help\".\n", *argv);
	265	return -1;
	266	}
	267
	268	argc--; argv++;
	269	}
	270
7901660a	271	ll_init_map(&rth);
aba5acdf SH	272
	273	if (d[0]) {
	274	if ((t.tcm_ifindex = ll_name_to_index(d)) == 0) {
	275	fprintf(stderr, "Cannot find device \"%s\"\n", d);
11656f1b	276	return 1;
aba5acdf SH	277	}
	278	filter_ifindex = t.tcm_ifindex;
	279	}
	280
7901660a	281	if (rtnl_dump_request(&rth, RTM_GETQDISC, &t, sizeof(t)) < 0) {
aba5acdf	282	perror("Cannot send dump request");
11656f1b	283	return 1;
aba5acdf SH	284	}
aba5acdf SH	285
7901660a	286	if (rtnl_dump_filter(&rth, print_qdisc, stdout, NULL, NULL) < 0) {
aba5acdf	287	fprintf(stderr, "Dump terminated\n");
11656f1b	288	return 1;
aba5acdf SH	289	}
aba5acdf SH	290
aba5acdf SH	291	return 0;
	292	}
	293
	294	int do_qdisc(int argc, char **argv)
	295	{
	296	if (argc < 1)
	297	return tc_qdisc_list(0, NULL);
	298	if (matches(*argv, "add") == 0)
	299	return tc_qdisc_modify(RTM_NEWQDISC, NLM_F_EXCL\|NLM_F_CREATE, argc-1, argv+1);
	300	if (matches(*argv, "change") == 0)
	301	return tc_qdisc_modify(RTM_NEWQDISC, 0, argc-1, argv+1);
	302	if (matches(*argv, "replace") == 0)
	303	return tc_qdisc_modify(RTM_NEWQDISC, NLM_F_CREATE\|NLM_F_REPLACE, argc-1, argv+1);
	304	if (matches(*argv, "link") == 0)
	305	return tc_qdisc_modify(RTM_NEWQDISC, NLM_F_REPLACE, argc-1, argv+1);
	306	if (matches(*argv, "delete") == 0)
	307	return tc_qdisc_modify(RTM_DELQDISC, 0, argc-1, argv+1);
	308	#if 0
	309	if (matches(*argv, "get") == 0)
	310	return tc_qdisc_get(RTM_GETQDISC, 0, argc-1, argv+1);
	311	#endif
	312	if (matches(argv, "list") == 0 \|\| matches(argv, "show") == 0
	313	\|\| matches(*argv, "lst") == 0)
	314	return tc_qdisc_list(argc-1, argv+1);
	315	if (matches(*argv, "help") == 0)
	316	usage();
	317	fprintf(stderr, "Command \"%s\" is unknown, try \"tc qdisc help\".\n", *argv);
	318	return -1;
	319	}