q_tbf.c revision 7b77c0caa6479aaf8e1e473a24372965f3315190 
1/*
2 * q_tbf.c		TBF.
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
23#include "utils.h"
24#include "tc_util.h"
25
26static void explain(void)
27{
28	fprintf(stderr, "Usage: ... tbf limit BYTES burst BYTES[/BYTES] rate KBPS [ mtu BYTES[/BYTES] ]\n");
29	fprintf(stderr, "               [ peakrate KBPS ] [ latency TIME ]\n");
30}
31
32static void explain1(char *arg)
33{
34	fprintf(stderr, "Illegal \"%s\"\n", arg);
35}
36
37
38#define usage() return(-1)
39
40static int tbf_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n)
41{
42	int ok=0;
43	struct tc_tbf_qopt opt;
44	__u32 rtab[256];
45	__u32 ptab[256];
46	unsigned buffer=0, mtu=0, mpu=0, latency=0;
47	int Rcell_log=-1, Pcell_log = -1;
48	struct rtattr *tail;
49
50	memset(&opt, 0, sizeof(opt));
51
52	while (argc > 0) {
53		if (matches(*argv, "limit") == 0) {
54			NEXT_ARG();
55			if (opt.limit || latency) {
56				fprintf(stderr, "Double \"limit/latency\" spec\n");
57				return -1;
58			}
59			if (get_size(&opt.limit, *argv)) {
60				explain1("limit");
61				return -1;
62			}
63			ok++;
64		} else if (matches(*argv, "latency") == 0) {
65			NEXT_ARG();
66			if (opt.limit || latency) {
67				fprintf(stderr, "Double \"limit/latency\" spec\n");
68				return -1;
69			}
70			if (get_usecs(&latency, *argv)) {
71				explain1("latency");
72				return -1;
73			}
74			ok++;
75		} else if (matches(*argv, "burst") == 0 ||
76			strcmp(*argv, "buffer") == 0 ||
77			strcmp(*argv, "maxburst") == 0) {
78			NEXT_ARG();
79			if (buffer) {
80				fprintf(stderr, "Double \"buffer/burst\" spec\n");
81				return -1;
82			}
83			if (get_size_and_cell(&buffer, &Rcell_log, *argv) < 0) {
84				explain1("buffer");
85				return -1;
86			}
87			ok++;
88		} else if (strcmp(*argv, "mtu") == 0 ||
89			   strcmp(*argv, "minburst") == 0) {
90			NEXT_ARG();
91			if (mtu) {
92				fprintf(stderr, "Double \"mtu/minburst\" spec\n");
93				return -1;
94			}
95			if (get_size_and_cell(&mtu, &Pcell_log, *argv) < 0) {
96				explain1("mtu");
97				return -1;
98			}
99			ok++;
100		} else if (strcmp(*argv, "mpu") == 0) {
101			NEXT_ARG();
102			if (mpu) {
103				fprintf(stderr, "Double \"mpu\" spec\n");
104				return -1;
105			}
106			if (get_size(&mpu, *argv)) {
107				explain1("mpu");
108				return -1;
109			}
110			ok++;
111		} else if (strcmp(*argv, "rate") == 0) {
112			NEXT_ARG();
113			if (opt.rate.rate) {
114				fprintf(stderr, "Double \"rate\" spec\n");
115				return -1;
116			}
117			if (get_rate(&opt.rate.rate, *argv)) {
118				explain1("rate");
119				return -1;
120			}
121			ok++;
122		} else if (matches(*argv, "peakrate") == 0) {
123			NEXT_ARG();
124			if (opt.peakrate.rate) {
125				fprintf(stderr, "Double \"peakrate\" spec\n");
126				return -1;
127			}
128			if (get_rate(&opt.peakrate.rate, *argv)) {
129				explain1("peakrate");
130				return -1;
131			}
132			ok++;
133		} else if (strcmp(*argv, "help") == 0) {
134			explain();
135			return -1;
136		} else {
137			fprintf(stderr, "What is \"%s\"?\n", *argv);
138			explain();
139			return -1;
140		}
141		argc--; argv++;
142	}
143
144	if (!ok)
145		return 0;
146
147	if (opt.rate.rate == 0 || !buffer) {
148		fprintf(stderr, "Both \"rate\" and \"burst\" are required.\n");
149		return -1;
150	}
151	if (opt.peakrate.rate) {
152		if (!mtu) {
153			fprintf(stderr, "\"mtu\" is required, if \"peakrate\" is requested.\n");
154			return -1;
155		}
156	}
157
158	if (opt.limit == 0 && latency == 0) {
159		fprintf(stderr, "Either \"limit\" or \"latency\" are required.\n");
160		return -1;
161	}
162
163	if (opt.limit == 0) {
164		double lim = opt.rate.rate*(double)latency/1000000 + buffer;
165		if (opt.peakrate.rate) {
166			double lim2 = opt.peakrate.rate*(double)latency/1000000 + mtu;
167			if (lim2 < lim)
168				lim = lim2;
169		}
170		opt.limit = lim;
171	}
172
173	if ((Rcell_log = tc_calc_rtable(opt.rate.rate, rtab, Rcell_log, mtu, mpu)) < 0) {
174		fprintf(stderr, "TBF: failed to calculate rate table.\n");
175		return -1;
176	}
177	opt.buffer = tc_calc_xmittime(opt.rate.rate, buffer);
178	opt.rate.cell_log = Rcell_log;
179	opt.rate.mpu = mpu;
180	if (opt.peakrate.rate) {
181		if ((Pcell_log = tc_calc_rtable(opt.peakrate.rate, ptab, Pcell_log, mtu, mpu)) < 0) {
182			fprintf(stderr, "TBF: failed to calculate peak rate table.\n");
183			return -1;
184		}
185		opt.mtu = tc_calc_xmittime(opt.peakrate.rate, mtu);
186		opt.peakrate.cell_log = Pcell_log;
187		opt.peakrate.mpu = mpu;
188	}
189
190	tail = NLMSG_TAIL(n);
191	addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
192	addattr_l(n, 2024, TCA_TBF_PARMS, &opt, sizeof(opt));
193	addattr_l(n, 3024, TCA_TBF_RTAB, rtab, 1024);
194	if (opt.peakrate.rate)
195		addattr_l(n, 4096, TCA_TBF_PTAB, ptab, 1024);
196	tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
197	return 0;
198}
199
200static int tbf_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
201{
202	struct rtattr *tb[TCA_TBF_PTAB+1];
203	struct tc_tbf_qopt *qopt;
204	double buffer, mtu;
205	double latency;
206	SPRINT_BUF(b1);
207	SPRINT_BUF(b2);
208
209	if (opt == NULL)
210		return 0;
211
212	parse_rtattr_nested(tb, TCA_TBF_PTAB, opt);
213
214	if (tb[TCA_TBF_PARMS] == NULL)
215		return -1;
216
217	qopt = RTA_DATA(tb[TCA_TBF_PARMS]);
218	if (RTA_PAYLOAD(tb[TCA_TBF_PARMS])  < sizeof(*qopt))
219		return -1;
220	fprintf(f, "rate %s ", sprint_rate(qopt->rate.rate, b1));
221	buffer = ((double)qopt->rate.rate*tc_core_tick2usec(qopt->buffer))/1000000;
222	if (show_details) {
223		fprintf(f, "burst %s/%u mpu %s ", sprint_size(buffer, b1),
224			1<<qopt->rate.cell_log, sprint_size(qopt->rate.mpu, b2));
225	} else {
226		fprintf(f, "burst %s ", sprint_size(buffer, b1));
227	}
228	if (show_raw)
229		fprintf(f, "[%08x] ", qopt->buffer);
230	if (qopt->peakrate.rate) {
231		fprintf(f, "peakrate %s ", sprint_rate(qopt->peakrate.rate, b1));
232		if (qopt->mtu || qopt->peakrate.mpu) {
233			mtu = ((double)qopt->peakrate.rate*tc_core_tick2usec(qopt->mtu))/1000000;
234			if (show_details) {
235				fprintf(f, "mtu %s/%u mpu %s ", sprint_size(mtu, b1),
236					1<<qopt->peakrate.cell_log, sprint_size(qopt->peakrate.mpu, b2));
237			} else {
238				fprintf(f, "minburst %s ", sprint_size(mtu, b1));
239			}
240			if (show_raw)
241				fprintf(f, "[%08x] ", qopt->mtu);
242		}
243	}
244
245	if (show_raw)
246		fprintf(f, "limit %s ", sprint_size(qopt->limit, b1));
247
248	latency = 1000000*(qopt->limit/(double)qopt->rate.rate) - tc_core_tick2usec(qopt->buffer);
249	if (qopt->peakrate.rate) {
250		double lat2 = 1000000*(qopt->limit/(double)qopt->peakrate.rate) - tc_core_tick2usec(qopt->mtu);
251		if (lat2 > latency)
252			latency = lat2;
253	}
254	fprintf(f, "lat %s ", sprint_usecs(latency, b1));
255
256	return 0;
257}
258
259struct qdisc_util tbf_qdisc_util = {
260	.id		= "tbf",
261	.parse_qopt	= tbf_parse_opt,
262	.print_qopt	= tbf_print_opt,
263};
264
265