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);
29
30static void usage(void)
31{
32	fprintf(stderr, "Usage: tc class [ add | del | change | replace | show ] 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	return;
41}
42
43int tc_class_modify(int cmd, unsigned flags, int argc, char **argv)
44{
45	struct {
46		struct nlmsghdr 	n;
47		struct tcmsg 		t;
48		char   			buf[4096];
49	} req;
50	struct qdisc_util *q = NULL;
51	struct tc_estimator est;
52	char  d[16];
53	char  k[16];
54
55	memset(&req, 0, sizeof(req));
56	memset(&est, 0, sizeof(est));
57	memset(d, 0, sizeof(d));
58	memset(k, 0, sizeof(k));
59
60	req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg));
61	req.n.nlmsg_flags = NLM_F_REQUEST|flags;
62	req.n.nlmsg_type = cmd;
63	req.t.tcm_family = AF_UNSPEC;
64
65	while (argc > 0) {
66		if (strcmp(*argv, "dev") == 0) {
67			NEXT_ARG();
68			if (d[0])
69				duparg("dev", *argv);
70			strncpy(d, *argv, sizeof(d)-1);
71		} else if (strcmp(*argv, "classid") == 0) {
72			__u32 handle;
73			NEXT_ARG();
74			if (req.t.tcm_handle)
75				duparg("classid", *argv);
76			if (get_tc_classid(&handle, *argv))
77				invarg(*argv, "invalid class ID");
78			req.t.tcm_handle = handle;
79		} else if (strcmp(*argv, "handle") == 0) {
80			fprintf(stderr, "Error: try \"classid\" instead of \"handle\"\n");
81			return -1;
82 		} else if (strcmp(*argv, "root") == 0) {
83			if (req.t.tcm_parent) {
84				fprintf(stderr, "Error: \"root\" is duplicate parent ID.\n");
85				return -1;
86			}
87			req.t.tcm_parent = TC_H_ROOT;
88		} else if (strcmp(*argv, "parent") == 0) {
89			__u32 handle;
90			NEXT_ARG();
91			if (req.t.tcm_parent)
92				duparg("parent", *argv);
93			if (get_tc_classid(&handle, *argv))
94				invarg(*argv, "invalid parent ID");
95			req.t.tcm_parent = handle;
96		} else if (matches(*argv, "estimator") == 0) {
97			if (parse_estimator(&argc, &argv, &est))
98				return -1;
99		} else if (matches(*argv, "help") == 0) {
100			usage();
101		} else {
102			strncpy(k, *argv, sizeof(k)-1);
103
104			q = get_qdisc_kind(k);
105			argc--; argv++;
106			break;
107		}
108		argc--; argv++;
109	}
110
111	if (k[0])
112		addattr_l(&req.n, sizeof(req), TCA_KIND, k, strlen(k)+1);
113	if (est.ewma_log)
114		addattr_l(&req.n, sizeof(req), TCA_RATE, &est, sizeof(est));
115
116	if (q) {
117		if (q->parse_copt == NULL) {
118			fprintf(stderr, "Error: Qdisc \"%s\" is classless.\n", k);
119			return 1;
120		}
121		if (q->parse_copt(q, argc, argv, &req.n))
122			return 1;
123	} else {
124		if (argc) {
125			if (matches(*argv, "help") == 0)
126				usage();
127			fprintf(stderr, "Garbage instead of arguments \"%s ...\". Try \"tc class help\".", *argv);
128			return -1;
129		}
130	}
131
132	if (d[0])  {
133		ll_init_map(&rth);
134
135		if ((req.t.tcm_ifindex = ll_name_to_index(d)) == 0) {
136			fprintf(stderr, "Cannot find device \"%s\"\n", d);
137			return 1;
138		}
139	}
140
141	if (rtnl_talk(&rth, &req.n, 0, 0, NULL) < 0)
142		return 2;
143
144	return 0;
145}
146
147int filter_ifindex;
148__u32 filter_qdisc;
149__u32 filter_classid;
150
151int print_class(const struct sockaddr_nl *who,
152		       struct nlmsghdr *n, void *arg)
153{
154	FILE *fp = (FILE*)arg;
155	struct tcmsg *t = NLMSG_DATA(n);
156	int len = n->nlmsg_len;
157	struct rtattr * tb[TCA_MAX+1];
158	struct qdisc_util *q;
159	char abuf[256];
160
161	if (n->nlmsg_type != RTM_NEWTCLASS && n->nlmsg_type != RTM_DELTCLASS) {
162		fprintf(stderr, "Not a class\n");
163		return 0;
164	}
165	len -= NLMSG_LENGTH(sizeof(*t));
166	if (len < 0) {
167		fprintf(stderr, "Wrong len %d\n", len);
168		return -1;
169	}
170	if (filter_qdisc && TC_H_MAJ(t->tcm_handle^filter_qdisc))
171		return 0;
172
173	if (filter_classid && t->tcm_handle != filter_classid)
174		return 0;
175
176	memset(tb, 0, sizeof(tb));
177	parse_rtattr(tb, TCA_MAX, TCA_RTA(t), len);
178
179	if (tb[TCA_KIND] == NULL) {
180		fprintf(stderr, "print_class: NULL kind\n");
181		return -1;
182	}
183
184	if (n->nlmsg_type == RTM_DELTCLASS)
185		fprintf(fp, "deleted ");
186
187	abuf[0] = 0;
188	if (t->tcm_handle) {
189		if (filter_qdisc)
190			print_tc_classid(abuf, sizeof(abuf), TC_H_MIN(t->tcm_handle));
191		else
192			print_tc_classid(abuf, sizeof(abuf), t->tcm_handle);
193	}
194	fprintf(fp, "class %s %s ", rta_getattr_str(tb[TCA_KIND]), abuf);
195
196	if (filter_ifindex == 0)
197		fprintf(fp, "dev %s ", ll_index_to_name(t->tcm_ifindex));
198
199	if (t->tcm_parent == TC_H_ROOT)
200		fprintf(fp, "root ");
201	else {
202		if (filter_qdisc)
203			print_tc_classid(abuf, sizeof(abuf), TC_H_MIN(t->tcm_parent));
204		else
205			print_tc_classid(abuf, sizeof(abuf), t->tcm_parent);
206		fprintf(fp, "parent %s ", abuf);
207	}
208	if (t->tcm_info)
209		fprintf(fp, "leaf %x: ", t->tcm_info>>16);
210	q = get_qdisc_kind(RTA_DATA(tb[TCA_KIND]));
211	if (tb[TCA_OPTIONS]) {
212		if (q && q->print_copt)
213			q->print_copt(q, fp, tb[TCA_OPTIONS]);
214		else
215			fprintf(fp, "[cannot parse class parameters]");
216	}
217	fprintf(fp, "\n");
218	if (show_stats) {
219		struct rtattr *xstats = NULL;
220
221		if (tb[TCA_STATS] || tb[TCA_STATS2]) {
222			print_tcstats_attr(fp, tb, " ", &xstats);
223			fprintf(fp, "\n");
224		}
225		if (q && (xstats || tb[TCA_XSTATS]) && q->print_xstats) {
226			q->print_xstats(q, fp, xstats ? : tb[TCA_XSTATS]);
227			fprintf(fp, "\n");
228		}
229	}
230	fflush(fp);
231	return 0;
232}
233
234
235int tc_class_list(int argc, char **argv)
236{
237	struct tcmsg t;
238	char d[16];
239
240	memset(&t, 0, sizeof(t));
241	t.tcm_family = AF_UNSPEC;
242	memset(d, 0, sizeof(d));
243
244	while (argc > 0) {
245		if (strcmp(*argv, "dev") == 0) {
246			NEXT_ARG();
247			if (d[0])
248				duparg("dev", *argv);
249			strncpy(d, *argv, sizeof(d)-1);
250		} else if (strcmp(*argv, "qdisc") == 0) {
251			NEXT_ARG();
252			if (filter_qdisc)
253				duparg("qdisc", *argv);
254			if (get_qdisc_handle(&filter_qdisc, *argv))
255				invarg(*argv, "invalid qdisc ID");
256		} else if (strcmp(*argv, "classid") == 0) {
257			NEXT_ARG();
258			if (filter_classid)
259				duparg("classid", *argv);
260			if (get_tc_classid(&filter_classid, *argv))
261				invarg(*argv, "invalid class ID");
262		} else if (strcmp(*argv, "root") == 0) {
263			if (t.tcm_parent) {
264				fprintf(stderr, "Error: \"root\" is duplicate parent ID\n");
265				return -1;
266			}
267			t.tcm_parent = TC_H_ROOT;
268		} else if (strcmp(*argv, "parent") == 0) {
269			__u32 handle;
270			if (t.tcm_parent)
271				duparg("parent", *argv);
272			NEXT_ARG();
273			if (get_tc_classid(&handle, *argv))
274				invarg(*argv, "invalid parent ID");
275			t.tcm_parent = handle;
276		} else if (matches(*argv, "help") == 0) {
277			usage();
278		} else {
279			fprintf(stderr, "What is \"%s\"? Try \"tc class help\".\n", *argv);
280			return -1;
281		}
282
283		argc--; argv++;
284	}
285
286 	ll_init_map(&rth);
287
288	if (d[0]) {
289		if ((t.tcm_ifindex = ll_name_to_index(d)) == 0) {
290			fprintf(stderr, "Cannot find device \"%s\"\n", d);
291			return 1;
292		}
293		filter_ifindex = t.tcm_ifindex;
294	}
295
296 	if (rtnl_dump_request(&rth, RTM_GETTCLASS, &t, sizeof(t)) < 0) {
297		perror("Cannot send dump request");
298		return 1;
299	}
300
301 	if (rtnl_dump_filter(&rth, print_class, stdout) < 0) {
302		fprintf(stderr, "Dump terminated\n");
303		return 1;
304	}
305
306	return 0;
307}
308
309int do_class(int argc, char **argv)
310{
311	if (argc < 1)
312		return tc_class_list(0, NULL);
313	if (matches(*argv, "add") == 0)
314		return tc_class_modify(RTM_NEWTCLASS, NLM_F_EXCL|NLM_F_CREATE, argc-1, argv+1);
315	if (matches(*argv, "change") == 0)
316		return tc_class_modify(RTM_NEWTCLASS, 0, argc-1, argv+1);
317	if (matches(*argv, "replace") == 0)
318		return tc_class_modify(RTM_NEWTCLASS, NLM_F_CREATE, argc-1, argv+1);
319	if (matches(*argv, "delete") == 0)
320		return tc_class_modify(RTM_DELTCLASS, 0,  argc-1, argv+1);
321#if 0
322	if (matches(*argv, "get") == 0)
323		return tc_class_get(RTM_GETTCLASS, 0,  argc-1, argv+1);
324#endif
325	if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0
326	    || matches(*argv, "lst") == 0)
327		return tc_class_list(argc-1, argv+1);
328	if (matches(*argv, "help") == 0) {
329		usage();
330		return 0;
331	}
332	fprintf(stderr, "Command \"%s\" is unknown, try \"tc class help\".\n", *argv);
333	return -1;
334}
335