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 ] ");
30	fprintf(stderr, "[ overhead BYTES ] [ linklayer TYPE ]\n");
31}
32
33static void explain1(char *arg)
34{
35	fprintf(stderr, "Illegal \"%s\"\n", arg);
36}
37
38
39static int tbf_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n)
40{
41	int ok=0;
42	struct tc_tbf_qopt opt;
43	__u32 rtab[256];
44	__u32 ptab[256];
45	unsigned buffer=0, mtu=0, mpu=0, latency=0;
46	int Rcell_log=-1, Pcell_log = -1;
47	unsigned short overhead=0;
48	unsigned int linklayer = LINKLAYER_ETHERNET; /* Assume ethernet */
49	struct rtattr *tail;
50
51	memset(&opt, 0, sizeof(opt));
52
53	while (argc > 0) {
54		if (matches(*argv, "limit") == 0) {
55			NEXT_ARG();
56			if (opt.limit || latency) {
57				fprintf(stderr, "Double \"limit/latency\" spec\n");
58				return -1;
59			}
60			if (get_size(&opt.limit, *argv)) {
61				explain1("limit");
62				return -1;
63			}
64			ok++;
65		} else if (matches(*argv, "latency") == 0) {
66			NEXT_ARG();
67			if (opt.limit || latency) {
68				fprintf(stderr, "Double \"limit/latency\" spec\n");
69				return -1;
70			}
71			if (get_time(&latency, *argv)) {
72				explain1("latency");
73				return -1;
74			}
75			ok++;
76		} else if (matches(*argv, "burst") == 0 ||
77			strcmp(*argv, "buffer") == 0 ||
78			strcmp(*argv, "maxburst") == 0) {
79			NEXT_ARG();
80			if (buffer) {
81				fprintf(stderr, "Double \"buffer/burst\" spec\n");
82				return -1;
83			}
84			if (get_size_and_cell(&buffer, &Rcell_log, *argv) < 0) {
85				explain1("buffer");
86				return -1;
87			}
88			ok++;
89		} else if (strcmp(*argv, "mtu") == 0 ||
90			   strcmp(*argv, "minburst") == 0) {
91			NEXT_ARG();
92			if (mtu) {
93				fprintf(stderr, "Double \"mtu/minburst\" spec\n");
94				return -1;
95			}
96			if (get_size_and_cell(&mtu, &Pcell_log, *argv) < 0) {
97				explain1("mtu");
98				return -1;
99			}
100			ok++;
101		} else if (strcmp(*argv, "mpu") == 0) {
102			NEXT_ARG();
103			if (mpu) {
104				fprintf(stderr, "Double \"mpu\" spec\n");
105				return -1;
106			}
107			if (get_size(&mpu, *argv)) {
108				explain1("mpu");
109				return -1;
110			}
111			ok++;
112		} else if (strcmp(*argv, "rate") == 0) {
113			NEXT_ARG();
114			if (opt.rate.rate) {
115				fprintf(stderr, "Double \"rate\" spec\n");
116				return -1;
117			}
118			if (get_rate(&opt.rate.rate, *argv)) {
119				explain1("rate");
120				return -1;
121			}
122			ok++;
123		} else if (matches(*argv, "peakrate") == 0) {
124			NEXT_ARG();
125			if (opt.peakrate.rate) {
126				fprintf(stderr, "Double \"peakrate\" spec\n");
127				return -1;
128			}
129			if (get_rate(&opt.peakrate.rate, *argv)) {
130				explain1("peakrate");
131				return -1;
132			}
133			ok++;
134		} else if (matches(*argv, "overhead") == 0) {
135			NEXT_ARG();
136			if (overhead) {
137				fprintf(stderr, "Double \"overhead\" spec\n");
138				return -1;
139			}
140			if (get_u16(&overhead, *argv, 10)) {
141				explain1("overhead"); return -1;
142			}
143		} else if (matches(*argv, "linklayer") == 0) {
144			NEXT_ARG();
145			if (get_linklayer(&linklayer, *argv)) {
146				explain1("linklayer"); return -1;
147			}
148		} else if (strcmp(*argv, "help") == 0) {
149			explain();
150			return -1;
151		} else {
152			fprintf(stderr, "What is \"%s\"?\n", *argv);
153			explain();
154			return -1;
155		}
156		argc--; argv++;
157	}
158
159	if (!ok) {
160		explain();
161		return -1;
162	}
163
164	if (opt.rate.rate == 0 || !buffer) {
165		fprintf(stderr, "Both \"rate\" and \"burst\" are required.\n");
166		return -1;
167	}
168	if (opt.peakrate.rate) {
169		if (!mtu) {
170			fprintf(stderr, "\"mtu\" is required, if \"peakrate\" is requested.\n");
171			return -1;
172		}
173	}
174
175	if (opt.limit == 0 && latency == 0) {
176		fprintf(stderr, "Either \"limit\" or \"latency\" are required.\n");
177		return -1;
178	}
179
180	if (opt.limit == 0) {
181		double lim = opt.rate.rate*(double)latency/TIME_UNITS_PER_SEC + buffer;
182		if (opt.peakrate.rate) {
183			double lim2 = opt.peakrate.rate*(double)latency/TIME_UNITS_PER_SEC + mtu;
184			if (lim2 < lim)
185				lim = lim2;
186		}
187		opt.limit = lim;
188	}
189
190	opt.rate.mpu      = mpu;
191	opt.rate.overhead = overhead;
192	if (tc_calc_rtable(&opt.rate, rtab, Rcell_log, mtu, linklayer) < 0) {
193		fprintf(stderr, "TBF: failed to calculate rate table.\n");
194		return -1;
195	}
196	opt.buffer = tc_calc_xmittime(opt.rate.rate, buffer);
197
198	if (opt.peakrate.rate) {
199		opt.peakrate.mpu      = mpu;
200		opt.peakrate.overhead = overhead;
201		if (tc_calc_rtable(&opt.peakrate, ptab, Pcell_log, mtu, linklayer) < 0) {
202			fprintf(stderr, "TBF: failed to calculate peak rate table.\n");
203			return -1;
204		}
205		opt.mtu = tc_calc_xmittime(opt.peakrate.rate, mtu);
206	}
207
208	tail = NLMSG_TAIL(n);
209	addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
210	addattr_l(n, 2024, TCA_TBF_PARMS, &opt, sizeof(opt));
211	addattr_l(n, 3024, TCA_TBF_RTAB, rtab, 1024);
212	if (opt.peakrate.rate)
213		addattr_l(n, 4096, TCA_TBF_PTAB, ptab, 1024);
214	tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
215	return 0;
216}
217
218static int tbf_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
219{
220	struct rtattr *tb[TCA_TBF_PTAB+1];
221	struct tc_tbf_qopt *qopt;
222	double buffer, mtu;
223	double latency;
224	SPRINT_BUF(b1);
225	SPRINT_BUF(b2);
226
227	if (opt == NULL)
228		return 0;
229
230	parse_rtattr_nested(tb, TCA_TBF_PTAB, opt);
231
232	if (tb[TCA_TBF_PARMS] == NULL)
233		return -1;
234
235	qopt = RTA_DATA(tb[TCA_TBF_PARMS]);
236	if (RTA_PAYLOAD(tb[TCA_TBF_PARMS])  < sizeof(*qopt))
237		return -1;
238	fprintf(f, "rate %s ", sprint_rate(qopt->rate.rate, b1));
239	buffer = tc_calc_xmitsize(qopt->rate.rate, qopt->buffer);
240	if (show_details) {
241		fprintf(f, "burst %s/%u mpu %s ", sprint_size(buffer, b1),
242			1<<qopt->rate.cell_log, sprint_size(qopt->rate.mpu, b2));
243	} else {
244		fprintf(f, "burst %s ", sprint_size(buffer, b1));
245	}
246	if (show_raw)
247		fprintf(f, "[%08x] ", qopt->buffer);
248	if (qopt->peakrate.rate) {
249		fprintf(f, "peakrate %s ", sprint_rate(qopt->peakrate.rate, b1));
250		if (qopt->mtu || qopt->peakrate.mpu) {
251			mtu = tc_calc_xmitsize(qopt->peakrate.rate, qopt->mtu);
252			if (show_details) {
253				fprintf(f, "mtu %s/%u mpu %s ", sprint_size(mtu, b1),
254					1<<qopt->peakrate.cell_log, sprint_size(qopt->peakrate.mpu, b2));
255			} else {
256				fprintf(f, "minburst %s ", sprint_size(mtu, b1));
257			}
258			if (show_raw)
259				fprintf(f, "[%08x] ", qopt->mtu);
260		}
261	}
262
263	if (show_raw)
264		fprintf(f, "limit %s ", sprint_size(qopt->limit, b1));
265
266	latency = TIME_UNITS_PER_SEC*(qopt->limit/(double)qopt->rate.rate) - tc_core_tick2time(qopt->buffer);
267	if (qopt->peakrate.rate) {
268		double lat2 = TIME_UNITS_PER_SEC*(qopt->limit/(double)qopt->peakrate.rate) - tc_core_tick2time(qopt->mtu);
269		if (lat2 > latency)
270			latency = lat2;
271	}
272	fprintf(f, "lat %s ", sprint_time(latency, b1));
273
274	if (qopt->rate.overhead) {
275		fprintf(f, "overhead %d", qopt->rate.overhead);
276	}
277
278	return 0;
279}
280
281struct qdisc_util tbf_qdisc_util = {
282	.id		= "tbf",
283	.parse_qopt	= tbf_parse_opt,
284	.print_qopt	= tbf_print_opt,
285};
286
287