tc_class.c revision d81b135b6f659900c0a51ca1a733c165e49aaaec 
1/*
2 * tc_class.c		"tc class".
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 *
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
28static void usage(void) __attribute__((noreturn));
29
30static void usage(void)
31{
32	fprintf(stderr, "Usage: tc class [ add | del | change | get ] dev STRING\n");
33	fprintf(stderr, "       [ classid CLASSID ] [ root | parent CLASSID ]\n");
34	fprintf(stderr, "       [ [ QDISC_KIND ] [ help | OPTIONS ] ]\n");
35	fprintf(stderr, "\n");
36	fprintf(stderr, "       tc class show [ dev STRING ] [ root | parent CLASSID ]\n");
37	fprintf(stderr, "Where:\n");
38	fprintf(stderr, "QDISC_KIND := { prio | cbq | etc. }\n");
39	fprintf(stderr, "OPTIONS := ... try tc class add <desired QDISC_KIND> help\n");
40	exit(-1);
41}
42
43int tc_class_modify(int cmd, unsigned flags, int argc, char **argv)
44{
45	struct rtnl_handle rth;
46	struct {
47		struct nlmsghdr 	n;
48		struct tcmsg 		t;
49		char   			buf[4096];
50	} req;
51	struct qdisc_util *q = NULL;
52	struct tc_estimator est;
53	char  d[16];
54	char  k[16];
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, "classid") == 0) {
73			__u32 handle;
74			NEXT_ARG();
75			if (req.t.tcm_handle)
76				duparg("classid", *argv);
77			if (get_tc_classid(&handle, *argv))
78				invarg(*argv, "invalid class 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");
83				exit(-1);
84			}
85			req.t.tcm_parent = TC_H_ROOT;
86		} else if (strcmp(*argv, "parent") == 0) {
87			__u32 handle;
88			NEXT_ARG();
89			if (req.t.tcm_parent)
90				duparg("parent", *argv);
91			if (get_tc_classid(&handle, *argv))
92				invarg(*argv, "invalid parent ID");
93			req.t.tcm_parent = handle;
94		} else if (matches(*argv, "estimator") == 0) {
95			if (parse_estimator(&argc, &argv, &est))
96				return -1;
97		} else if (matches(*argv, "help") == 0) {
98			usage();
99		} else {
100			strncpy(k, *argv, sizeof(k)-1);
101
102			q = get_qdisc_kind(k);
103			argc--; argv++;
104			break;
105		}
106		argc--; argv++;
107	}
108
109	if (k[0])
110		addattr_l(&req.n, sizeof(req), TCA_KIND, k, strlen(k)+1);
111	if (est.ewma_log)
112		addattr_l(&req.n, sizeof(req), TCA_RATE, &est, sizeof(est));
113
114	if (q) {
115		if (q->parse_copt == NULL) {
116			fprintf(stderr, "Error: Qdisc \"%s\" is classless.\n", k);
117			exit(1);
118		}
119		if (q->parse_copt(q, argc, argv, &req.n))
120			exit(1);
121	} else {
122		if (argc) {
123			if (matches(*argv, "help") == 0)
124				usage();
125			fprintf(stderr, "Garbage instead of arguments \"%s ...\". Try \"tc class help\".", *argv);
126			exit(-1);
127		}
128	}
129
130	if (rtnl_open(&rth, 0) < 0) {
131		fprintf(stderr, "Cannot open rtnetlink\n");
132		exit(1);
133	}
134
135	if (d[0])  {
136		ll_init_map(&rth);
137
138		if ((req.t.tcm_ifindex = ll_name_to_index(d)) == 0) {
139			fprintf(stderr, "Cannot find device \"%s\"\n", d);
140			exit(1);
141		}
142	}
143
144	if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0)
145		exit(2);
146
147	rtnl_close(&rth);
148	return 0;
149}
150
151void print_class_tcstats(FILE *fp, struct tc_stats *st)
152{
153	SPRINT_BUF(b1);
154
155	fprintf(fp, " Sent %llu bytes %u pkts (dropped %u, overlimits %u) ",
156		(unsigned long long)st->bytes, st->packets, st->drops, st->overlimits);
157	if (st->bps || st->pps || st->qlen || st->backlog) {
158		fprintf(fp, "\n ");
159		if (st->bps || st->pps) {
160			fprintf(fp, "rate ");
161			if (st->bps)
162				fprintf(fp, "%s ", sprint_rate(st->bps, b1));
163			if (st->pps)
164				fprintf(fp, "%upps ", st->pps);
165		}
166		if (st->qlen || st->backlog) {
167			fprintf(fp, "backlog ");
168			if (st->backlog)
169				fprintf(fp, "%s ", sprint_size(st->backlog, b1));
170			if (st->qlen)
171				fprintf(fp, "%up ", st->qlen);
172		}
173	}
174}
175
176int filter_ifindex;
177__u32 filter_qdisc;
178
179int print_class(struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
180{
181	FILE *fp = (FILE*)arg;
182	struct tcmsg *t = NLMSG_DATA(n);
183	int len = n->nlmsg_len;
184	struct rtattr * tb[TCA_MAX+1];
185	struct qdisc_util *q;
186	char abuf[256];
187
188	if (n->nlmsg_type != RTM_NEWTCLASS && n->nlmsg_type != RTM_DELTCLASS) {
189		fprintf(stderr, "Not a class\n");
190		return 0;
191	}
192	len -= NLMSG_LENGTH(sizeof(*t));
193	if (len < 0) {
194		fprintf(stderr, "Wrong len %d\n", len);
195		return -1;
196	}
197	if (filter_qdisc && TC_H_MAJ(t->tcm_handle^filter_qdisc))
198		return 0;
199
200	memset(tb, 0, sizeof(tb));
201	parse_rtattr(tb, TCA_MAX, TCA_RTA(t), len);
202
203	if (tb[TCA_KIND] == NULL) {
204		fprintf(stderr, "print_class: NULL kind\n");
205		return -1;
206	}
207
208	if (n->nlmsg_type == RTM_DELTCLASS)
209		fprintf(fp, "deleted ");
210
211	abuf[0] = 0;
212	if (t->tcm_handle) {
213		if (filter_qdisc)
214			print_tc_classid(abuf, sizeof(abuf), TC_H_MIN(t->tcm_handle));
215		else
216			print_tc_classid(abuf, sizeof(abuf), t->tcm_handle);
217	}
218	fprintf(fp, "class %s %s ", (char*)RTA_DATA(tb[TCA_KIND]), abuf);
219
220	if (filter_ifindex == 0)
221		fprintf(fp, "dev %s ", ll_index_to_name(t->tcm_ifindex));
222
223	if (t->tcm_parent == TC_H_ROOT)
224		fprintf(fp, "root ");
225	else {
226		if (filter_qdisc)
227			print_tc_classid(abuf, sizeof(abuf), TC_H_MIN(t->tcm_parent));
228		else
229			print_tc_classid(abuf, sizeof(abuf), t->tcm_parent);
230		fprintf(fp, "parent %s ", abuf);
231	}
232	if (t->tcm_info)
233		fprintf(fp, "leaf %x: ", t->tcm_info>>16);
234	q = get_qdisc_kind(RTA_DATA(tb[TCA_KIND]));
235	if (tb[TCA_OPTIONS]) {
236		if (q && q->print_copt)
237			q->print_copt(q, fp, tb[TCA_OPTIONS]);
238		else
239			fprintf(fp, "[cannot parse class parameters]");
240	}
241	fprintf(fp, "\n");
242	if (show_stats) {
243		if (tb[TCA_STATS]) {
244			if (RTA_PAYLOAD(tb[TCA_STATS]) < sizeof(struct tc_stats))
245				fprintf(fp, "statistics truncated");
246			else {
247				struct tc_stats st;
248				memcpy(&st, RTA_DATA(tb[TCA_STATS]), sizeof(st));
249				print_class_tcstats(fp, &st);
250				fprintf(fp, "\n");
251			}
252		}
253		if (q && tb[TCA_XSTATS]) {
254			q->print_xstats(q, fp, tb[TCA_XSTATS]);
255			fprintf(fp, "\n");
256		}
257	}
258	fflush(fp);
259	return 0;
260}
261
262
263int tc_class_list(int argc, char **argv)
264{
265	struct tcmsg t;
266	struct rtnl_handle rth;
267	char d[16];
268
269	memset(&t, 0, sizeof(t));
270	t.tcm_family = AF_UNSPEC;
271	memset(d, 0, sizeof(d));
272
273	while (argc > 0) {
274		if (strcmp(*argv, "dev") == 0) {
275			NEXT_ARG();
276			if (d[0])
277				duparg("dev", *argv);
278			strncpy(d, *argv, sizeof(d)-1);
279		} else if (strcmp(*argv, "qdisc") == 0) {
280			NEXT_ARG();
281			if (filter_qdisc)
282				duparg("qdisc", *argv);
283			if (get_qdisc_handle(&filter_qdisc, *argv))
284				invarg(*argv, "invalid qdisc ID");
285		} else if (strcmp(*argv, "root") == 0) {
286			if (t.tcm_parent) {
287				fprintf(stderr, "Error: \"root\" is duplicate parent ID\n");
288				exit(-1);
289			}
290			t.tcm_parent = TC_H_ROOT;
291		} else if (strcmp(*argv, "parent") == 0) {
292			__u32 handle;
293			if (t.tcm_parent)
294				duparg("parent", *argv);
295			NEXT_ARG();
296			if (get_tc_classid(&handle, *argv))
297				invarg(*argv, "invalid parent ID");
298			t.tcm_parent = handle;
299		} else if (matches(*argv, "help") == 0) {
300			usage();
301		} else {
302			fprintf(stderr, "What is \"%s\"? Try \"tc class help\".\n", *argv);
303			exit(-1);
304		}
305
306		argc--; argv++;
307	}
308
309	if (rtnl_open(&rth, 0) < 0) {
310		fprintf(stderr, "Cannot open rtnetlink\n");
311		exit(1);
312	}
313
314	ll_init_map(&rth);
315
316	if (d[0]) {
317		if ((t.tcm_ifindex = ll_name_to_index(d)) == 0) {
318			fprintf(stderr, "Cannot find device \"%s\"\n", d);
319			exit(1);
320		}
321		filter_ifindex = t.tcm_ifindex;
322	}
323
324	if (rtnl_dump_request(&rth, RTM_GETTCLASS, &t, sizeof(t)) < 0) {
325		perror("Cannot send dump request");
326		rtnl_close(&rth);
327		exit(1);
328	}
329
330	if (rtnl_dump_filter(&rth, print_class, stdout, NULL, NULL) < 0) {
331		fprintf(stderr, "Dump terminated\n");
332		rtnl_close(&rth);
333		exit(1);
334	}
335
336	rtnl_close(&rth);
337	return 0;
338}
339
340int do_class(int argc, char **argv)
341{
342	if (argc < 1)
343		return tc_class_list(0, NULL);
344	if (matches(*argv, "add") == 0)
345		return tc_class_modify(RTM_NEWTCLASS, NLM_F_EXCL|NLM_F_CREATE, argc-1, argv+1);
346	if (matches(*argv, "change") == 0)
347		return tc_class_modify(RTM_NEWTCLASS, 0, argc-1, argv+1);
348	if (matches(*argv, "replace") == 0)
349		return tc_class_modify(RTM_NEWTCLASS, NLM_F_CREATE, argc-1, argv+1);
350	if (matches(*argv, "delete") == 0)
351		return tc_class_modify(RTM_DELTCLASS, 0,  argc-1, argv+1);
352#if 0
353	if (matches(*argv, "get") == 0)
354		return tc_class_get(RTM_GETTCLASS, 0,  argc-1, argv+1);
355#endif
356	if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0
357	    || matches(*argv, "lst") == 0)
358		return tc_class_list(argc-1, argv+1);
359	if (matches(*argv, "help") == 0)
360		usage();
361	fprintf(stderr, "Command \"%s\" is unknown, try \"tc class help\".\n", *argv);
362	return -1;
363}
364