m_police.c revision ef1d6f97ec725e5e942f092ab4f5a4ceff17bb9c 
1/*
2 * m_police.c		Parse/print policing module options.
3 *
4 *		This program is free software; you can u32istribute 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 * FIXES:       19990619 - J Hadi Salim (hadi@cyberus.ca)
11 *		simple addattr packaging fix.
12 *		2002: J Hadi Salim - Add tc action extensions syntax
13 *
14 */
15
16#include <stdio.h>
17#include <stdlib.h>
18#include <unistd.h>
19#include <syslog.h>
20#include <fcntl.h>
21#include <sys/socket.h>
22#include <netinet/in.h>
23#include <arpa/inet.h>
24#include <string.h>
25
26#include "utils.h"
27#include "tc_util.h"
28
29struct action_util police_action_util = {
30	.id = "police",
31	.parse_aopt = act_parse_police,
32	.print_aopt = print_police,
33};
34
35static void usage(void)
36{
37	fprintf(stderr, "Usage: ... police rate BPS burst BYTES[/BYTES] [ mtu BYTES[/BYTES] ]\n");
38	fprintf(stderr, "                [ peakrate BPS ] [ avrate BPS ]\n");
39	fprintf(stderr, "                [ ACTIONTERM ]\n");
40	fprintf(stderr, "Old Syntax ACTIONTERM := action <EXCEEDACT>[/NOTEXCEEDACT] \n");
41	fprintf(stderr, "New Syntax ACTIONTERM := conform-exceed <EXCEEDACT>[/NOTEXCEEDACT] \n");
42	fprintf(stderr, "Where: *EXCEEDACT := pipe | ok | reclassify | drop | continue \n");
43	fprintf(stderr, "Where:  pipe is only valid for new syntax \n");
44	exit(-1);
45}
46
47static void explain1(char *arg)
48{
49	fprintf(stderr, "Illegal \"%s\"\n", arg);
50}
51
52char *police_action_n2a(int action, char *buf, int len)
53{
54	switch (action) {
55	case -1:
56		return "continue";
57		break;
58	case TC_POLICE_OK:
59		return "pass";
60		break;
61	case TC_POLICE_SHOT:
62		return "drop";
63		break;
64	case TC_POLICE_RECLASSIFY:
65		return "reclassify";
66	case TC_POLICE_PIPE:
67		return "pipe";
68	default:
69		snprintf(buf, len, "%d", action);
70		return buf;
71	}
72}
73
74int police_action_a2n(char *arg, int *result)
75{
76	int res;
77
78	if (matches(arg, "continue") == 0)
79		res = -1;
80	else if (matches(arg, "drop") == 0)
81		res = TC_POLICE_SHOT;
82	else if (matches(arg, "shot") == 0)
83		res = TC_POLICE_SHOT;
84	else if (matches(arg, "pass") == 0)
85		res = TC_POLICE_OK;
86	else if (strcmp(arg, "ok") == 0)
87		res = TC_POLICE_OK;
88	else if (matches(arg, "reclassify") == 0)
89		res = TC_POLICE_RECLASSIFY;
90	else if (matches(arg, "pipe") == 0)
91		res = TC_POLICE_PIPE;
92	else {
93		char dummy;
94		if (sscanf(arg, "%d%c", &res, &dummy) != 1)
95			return -1;
96	}
97	*result = res;
98	return 0;
99}
100
101
102int get_police_result(int *action, int *result, char *arg)
103{
104	char *p = strchr(arg, '/');
105
106	if (p)
107		*p = 0;
108
109	if (police_action_a2n(arg, action)) {
110		if (p)
111			*p = '/';
112		return -1;
113	}
114
115	if (p) {
116		*p = '/';
117		if (police_action_a2n(p+1, result))
118			return -1;
119	}
120	return 0;
121}
122
123
124int act_parse_police(struct action_util *a,int *argc_p, char ***argv_p, int tca_id, struct nlmsghdr *n)
125{
126	int argc = *argc_p;
127	char **argv = *argv_p;
128	int res = -1;
129	int ok=0;
130	struct tc_police p;
131	__u32 rtab[256];
132	__u32 ptab[256];
133	__u32 avrate = 0;
134	int presult = 0;
135	unsigned buffer=0, mtu=0, mpu=0;
136	int Rcell_log=-1, Pcell_log = -1;
137	struct rtattr *tail;
138
139	memset(&p, 0, sizeof(p));
140	p.action = TC_POLICE_RECLASSIFY;
141
142	if (a) /* new way of doing things */
143		NEXT_ARG();
144
145	if (argc <= 0)
146		return -1;
147
148	while (argc > 0) {
149
150		if (matches(*argv, "index") == 0) {
151			NEXT_ARG();
152			if (get_u32(&p.index, *argv, 10)) {
153				fprintf(stderr, "Illegal \"index\"\n");
154				return -1;
155			}
156		} else if (matches(*argv, "burst") == 0 ||
157			strcmp(*argv, "buffer") == 0 ||
158			strcmp(*argv, "maxburst") == 0) {
159			NEXT_ARG();
160			if (buffer) {
161				fprintf(stderr, "Double \"buffer/burst\" spec\n");
162				return -1;
163			}
164			if (get_size_and_cell(&buffer, &Rcell_log, *argv) < 0) {
165				explain1("buffer");
166				return -1;
167			}
168		} else if (strcmp(*argv, "mtu") == 0 ||
169			   strcmp(*argv, "minburst") == 0) {
170			NEXT_ARG();
171			if (mtu) {
172				fprintf(stderr, "Double \"mtu/minburst\" spec\n");
173				return -1;
174			}
175			if (get_size_and_cell(&mtu, &Pcell_log, *argv) < 0) {
176				explain1("mtu");
177				return -1;
178			}
179		} else if (strcmp(*argv, "mpu") == 0) {
180			NEXT_ARG();
181			if (mpu) {
182				fprintf(stderr, "Double \"mpu\" spec\n");
183				return -1;
184			}
185			if (get_size(&mpu, *argv)) {
186				explain1("mpu");
187				return -1;
188			}
189		} else if (strcmp(*argv, "rate") == 0) {
190			NEXT_ARG();
191			if (p.rate.rate) {
192				fprintf(stderr, "Double \"rate\" spec\n");
193				return -1;
194			}
195			if (get_rate(&p.rate.rate, *argv)) {
196				explain1("rate");
197				return -1;
198			}
199		} else if (strcmp(*argv, "avrate") == 0) {
200			NEXT_ARG();
201			if (avrate) {
202				fprintf(stderr, "Double \"avrate\" spec\n");
203				return -1;
204			}
205			if (get_rate(&avrate, *argv)) {
206				explain1("avrate");
207				return -1;
208			}
209		} else if (matches(*argv, "peakrate") == 0) {
210			NEXT_ARG();
211			if (p.peakrate.rate) {
212				fprintf(stderr, "Double \"peakrate\" spec\n");
213				return -1;
214			}
215			if (get_rate(&p.peakrate.rate, *argv)) {
216				explain1("peakrate");
217				return -1;
218			}
219		} else if (matches(*argv, "reclassify") == 0) {
220			p.action = TC_POLICE_RECLASSIFY;
221		} else if (matches(*argv, "drop") == 0 ||
222			   matches(*argv, "shot") == 0) {
223			p.action = TC_POLICE_SHOT;
224		} else if (matches(*argv, "continue") == 0) {
225			p.action = TC_POLICE_UNSPEC;
226		} else if (matches(*argv, "pass") == 0) {
227			p.action = TC_POLICE_OK;
228		} else if (matches(*argv, "pipe") == 0) {
229			p.action = TC_POLICE_PIPE;
230		} else if (strcmp(*argv, "action") == 0 ||
231			   strcmp(*argv, "conform-exceed") == 0) {
232			NEXT_ARG();
233			if (get_police_result(&p.action, &presult, *argv)) {
234				fprintf(stderr, "Illegal \"action\"\n");
235				return -1;
236			}
237		} else if (strcmp(*argv, "help") == 0) {
238			usage();
239		} else {
240			break;
241		}
242		ok++;
243		argc--; argv++;
244	}
245
246	if (!ok)
247		return -1;
248
249	if (p.rate.rate && !buffer) {
250		fprintf(stderr, "\"burst\" requires \"rate\".\n");
251		return -1;
252	}
253	if (p.peakrate.rate) {
254		if (!p.rate.rate) {
255			fprintf(stderr, "\"peakrate\" requires \"rate\".\n");
256			return -1;
257		}
258		if (!mtu) {
259			fprintf(stderr, "\"mtu\" is required, if \"peakrate\" is requested.\n");
260			return -1;
261		}
262	}
263
264	if (p.rate.rate) {
265		p.rate.mpu = mpu;
266		if (tc_calc_rtable(&p.rate, rtab, Rcell_log, mtu) < 0) {
267			fprintf(stderr, "TBF: failed to calculate rate table.\n");
268			return -1;
269		}
270		p.burst = tc_calc_xmittime(p.rate.rate, buffer);
271	}
272	p.mtu = mtu;
273	if (p.peakrate.rate) {
274		p.peakrate.mpu = mpu;
275		if (tc_calc_rtable(&p.peakrate, ptab, Pcell_log, mtu) < 0) {
276			fprintf(stderr, "POLICE: failed to calculate peak rate table.\n");
277			return -1;
278		}
279	}
280
281	tail = NLMSG_TAIL(n);
282	addattr_l(n, MAX_MSG, tca_id, NULL, 0);
283	addattr_l(n, MAX_MSG, TCA_POLICE_TBF, &p, sizeof(p));
284	if (p.rate.rate)
285		addattr_l(n, MAX_MSG, TCA_POLICE_RATE, rtab, 1024);
286	if (p.peakrate.rate)
287                addattr_l(n, MAX_MSG, TCA_POLICE_PEAKRATE, ptab, 1024);
288	if (avrate)
289		addattr32(n, MAX_MSG, TCA_POLICE_AVRATE, avrate);
290	if (presult)
291		addattr32(n, MAX_MSG, TCA_POLICE_RESULT, presult);
292
293	tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
294	res = 0;
295
296	*argc_p = argc;
297	*argv_p = argv;
298	return res;
299}
300
301int parse_police(int *argc_p, char ***argv_p, int tca_id, struct nlmsghdr *n)
302{
303	return act_parse_police(NULL,argc_p,argv_p,tca_id,n);
304}
305
306int
307print_police(struct action_util *a, FILE *f, struct rtattr *arg)
308{
309	SPRINT_BUF(b1);
310	struct tc_police *p;
311	struct rtattr *tb[TCA_POLICE_MAX+1];
312	unsigned buffer;
313
314	if (arg == NULL)
315		return 0;
316
317	parse_rtattr_nested(tb, TCA_POLICE_MAX, arg);
318
319	if (tb[TCA_POLICE_TBF] == NULL) {
320		fprintf(f, "[NULL police tbf]");
321		return 0;
322	}
323#ifndef STOOPID_8BYTE
324	if (RTA_PAYLOAD(tb[TCA_POLICE_TBF])  < sizeof(*p)) {
325		fprintf(f, "[truncated police tbf]");
326		return -1;
327	}
328#endif
329	p = RTA_DATA(tb[TCA_POLICE_TBF]);
330
331	fprintf(f, " police 0x%x ", p->index);
332	fprintf(f, "rate %s ", sprint_rate(p->rate.rate, b1));
333	buffer = tc_calc_xmitsize(p->rate.rate, p->burst);
334	fprintf(f, "burst %s ", sprint_size(buffer, b1));
335	fprintf(f, "mtu %s ", sprint_size(p->mtu, b1));
336	if (show_raw)
337		fprintf(f, "[%08x] ", p->burst);
338	if (p->peakrate.rate)
339		fprintf(f, "peakrate %s ", sprint_rate(p->peakrate.rate, b1));
340	if (tb[TCA_POLICE_AVRATE])
341		fprintf(f, "avrate %s ", sprint_rate(*(__u32*)RTA_DATA(tb[TCA_POLICE_AVRATE]), b1));
342	fprintf(f, "action %s", police_action_n2a(p->action, b1, sizeof(b1)));
343	if (tb[TCA_POLICE_RESULT]) {
344		fprintf(f, "/%s ", police_action_n2a(*(int*)RTA_DATA(tb[TCA_POLICE_RESULT]), b1, sizeof(b1)));
345	} else
346		fprintf(f, " ");
347	fprintf(f, "\nref %d bind %d\n",p->refcnt, p->bindcnt);
348
349	return 0;
350}
351
352int
353tc_print_police(FILE *f, struct rtattr *arg) {
354	return print_police(&police_action_util,f,arg);
355}
356