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 ] [ overhead BYTES ]\n");
39	fprintf(stderr, "                [ linklayer TYPE ] [ ACTIONTERM ]\n");
40
41	fprintf(stderr, "Old Syntax ACTIONTERM := action <EXCEEDACT>[/NOTEXCEEDACT] \n");
42	fprintf(stderr, "New Syntax ACTIONTERM := conform-exceed <EXCEEDACT>[/NOTEXCEEDACT] \n");
43	fprintf(stderr, "Where: *EXCEEDACT := pipe | ok | reclassify | drop | continue \n");
44	fprintf(stderr, "Where:  pipe is only valid for new syntax \n");
45	exit(-1);
46}
47
48static void explain1(char *arg)
49{
50	fprintf(stderr, "Illegal \"%s\"\n", arg);
51}
52
53char *police_action_n2a(int action, char *buf, int len)
54{
55	switch (action) {
56	case -1:
57		return "continue";
58		break;
59	case TC_POLICE_OK:
60		return "pass";
61		break;
62	case TC_POLICE_SHOT:
63		return "drop";
64		break;
65	case TC_POLICE_RECLASSIFY:
66		return "reclassify";
67	case TC_POLICE_PIPE:
68		return "pipe";
69	default:
70		snprintf(buf, len, "%d", action);
71		return buf;
72	}
73}
74
75int police_action_a2n(char *arg, int *result)
76{
77	int res;
78
79	if (matches(arg, "continue") == 0)
80		res = -1;
81	else if (matches(arg, "drop") == 0)
82		res = TC_POLICE_SHOT;
83	else if (matches(arg, "shot") == 0)
84		res = TC_POLICE_SHOT;
85	else if (matches(arg, "pass") == 0)
86		res = TC_POLICE_OK;
87	else if (strcmp(arg, "ok") == 0)
88		res = TC_POLICE_OK;
89	else if (matches(arg, "reclassify") == 0)
90		res = TC_POLICE_RECLASSIFY;
91	else if (matches(arg, "pipe") == 0)
92		res = TC_POLICE_PIPE;
93	else {
94		char dummy;
95		if (sscanf(arg, "%d%c", &res, &dummy) != 1)
96			return -1;
97	}
98	*result = res;
99	return 0;
100}
101
102
103int get_police_result(int *action, int *result, char *arg)
104{
105	char *p = strchr(arg, '/');
106
107	if (p)
108		*p = 0;
109
110	if (police_action_a2n(arg, action)) {
111		if (p)
112			*p = '/';
113		return -1;
114	}
115
116	if (p) {
117		*p = '/';
118		if (police_action_a2n(p+1, result))
119			return -1;
120	}
121	return 0;
122}
123
124
125int act_parse_police(struct action_util *a,int *argc_p, char ***argv_p, int tca_id, struct nlmsghdr *n)
126{
127	int argc = *argc_p;
128	char **argv = *argv_p;
129	int res = -1;
130	int ok=0;
131	struct tc_police p;
132	__u32 rtab[256];
133	__u32 ptab[256];
134	__u32 avrate = 0;
135	int presult = 0;
136	unsigned buffer=0, mtu=0, mpu=0;
137	unsigned short overhead=0;
138	unsigned int linklayer = LINKLAYER_ETHERNET; /* Assume ethernet */
139	int Rcell_log=-1, Pcell_log = -1;
140	struct rtattr *tail;
141
142	memset(&p, 0, sizeof(p));
143	p.action = TC_POLICE_RECLASSIFY;
144
145	if (a) /* new way of doing things */
146		NEXT_ARG();
147
148	if (argc <= 0)
149		return -1;
150
151	while (argc > 0) {
152
153		if (matches(*argv, "index") == 0) {
154			NEXT_ARG();
155			if (get_u32(&p.index, *argv, 10)) {
156				fprintf(stderr, "Illegal \"index\"\n");
157				return -1;
158			}
159		} else if (matches(*argv, "burst") == 0 ||
160			strcmp(*argv, "buffer") == 0 ||
161			strcmp(*argv, "maxburst") == 0) {
162			NEXT_ARG();
163			if (buffer) {
164				fprintf(stderr, "Double \"buffer/burst\" spec\n");
165				return -1;
166			}
167			if (get_size_and_cell(&buffer, &Rcell_log, *argv) < 0) {
168				explain1("buffer");
169				return -1;
170			}
171		} else if (strcmp(*argv, "mtu") == 0 ||
172			   strcmp(*argv, "minburst") == 0) {
173			NEXT_ARG();
174			if (mtu) {
175				fprintf(stderr, "Double \"mtu/minburst\" spec\n");
176				return -1;
177			}
178			if (get_size_and_cell(&mtu, &Pcell_log, *argv) < 0) {
179				explain1("mtu");
180				return -1;
181			}
182		} else if (strcmp(*argv, "mpu") == 0) {
183			NEXT_ARG();
184			if (mpu) {
185				fprintf(stderr, "Double \"mpu\" spec\n");
186				return -1;
187			}
188			if (get_size(&mpu, *argv)) {
189				explain1("mpu");
190				return -1;
191			}
192		} else if (strcmp(*argv, "rate") == 0) {
193			NEXT_ARG();
194			if (p.rate.rate) {
195				fprintf(stderr, "Double \"rate\" spec\n");
196				return -1;
197			}
198			if (get_rate(&p.rate.rate, *argv)) {
199				explain1("rate");
200				return -1;
201			}
202		} else if (strcmp(*argv, "avrate") == 0) {
203			NEXT_ARG();
204			if (avrate) {
205				fprintf(stderr, "Double \"avrate\" spec\n");
206				return -1;
207			}
208			if (get_rate(&avrate, *argv)) {
209				explain1("avrate");
210				return -1;
211			}
212		} else if (matches(*argv, "peakrate") == 0) {
213			NEXT_ARG();
214			if (p.peakrate.rate) {
215				fprintf(stderr, "Double \"peakrate\" spec\n");
216				return -1;
217			}
218			if (get_rate(&p.peakrate.rate, *argv)) {
219				explain1("peakrate");
220				return -1;
221			}
222		} else if (matches(*argv, "reclassify") == 0) {
223			p.action = TC_POLICE_RECLASSIFY;
224		} else if (matches(*argv, "drop") == 0 ||
225			   matches(*argv, "shot") == 0) {
226			p.action = TC_POLICE_SHOT;
227		} else if (matches(*argv, "continue") == 0) {
228			p.action = TC_POLICE_UNSPEC;
229		} else if (matches(*argv, "pass") == 0) {
230			p.action = TC_POLICE_OK;
231		} else if (matches(*argv, "pipe") == 0) {
232			p.action = TC_POLICE_PIPE;
233		} else if (strcmp(*argv, "action") == 0 ||
234			   strcmp(*argv, "conform-exceed") == 0) {
235			NEXT_ARG();
236			if (get_police_result(&p.action, &presult, *argv)) {
237				fprintf(stderr, "Illegal \"action\"\n");
238				return -1;
239			}
240		} else if (matches(*argv, "overhead") == 0) {
241			NEXT_ARG();
242			if (get_u16(&overhead, *argv, 10)) {
243				explain1("overhead"); return -1;
244			}
245		} else if (matches(*argv, "linklayer") == 0) {
246			NEXT_ARG();
247			if (get_linklayer(&linklayer, *argv)) {
248				explain1("linklayer"); return -1;
249			}
250		} else if (strcmp(*argv, "help") == 0) {
251			usage();
252		} else {
253			break;
254		}
255		ok++;
256		argc--; argv++;
257	}
258
259	if (!ok)
260		return -1;
261
262	if (p.rate.rate && !buffer) {
263		fprintf(stderr, "\"burst\" requires \"rate\".\n");
264		return -1;
265	}
266	if (p.peakrate.rate) {
267		if (!p.rate.rate) {
268			fprintf(stderr, "\"peakrate\" requires \"rate\".\n");
269			return -1;
270		}
271		if (!mtu) {
272			fprintf(stderr, "\"mtu\" is required, if \"peakrate\" is requested.\n");
273			return -1;
274		}
275	}
276
277	if (p.rate.rate) {
278		p.rate.mpu = mpu;
279		p.rate.overhead = overhead;
280		if (tc_calc_rtable(&p.rate, rtab, Rcell_log, mtu, linklayer) < 0) {
281			fprintf(stderr, "TBF: failed to calculate rate table.\n");
282			return -1;
283		}
284		p.burst = tc_calc_xmittime(p.rate.rate, buffer);
285	}
286	p.mtu = mtu;
287	if (p.peakrate.rate) {
288		p.peakrate.mpu = mpu;
289		p.peakrate.overhead = overhead;
290		if (tc_calc_rtable(&p.peakrate, ptab, Pcell_log, mtu, linklayer) < 0) {
291			fprintf(stderr, "POLICE: failed to calculate peak rate table.\n");
292			return -1;
293		}
294	}
295
296	tail = NLMSG_TAIL(n);
297	addattr_l(n, MAX_MSG, tca_id, NULL, 0);
298	addattr_l(n, MAX_MSG, TCA_POLICE_TBF, &p, sizeof(p));
299	if (p.rate.rate)
300		addattr_l(n, MAX_MSG, TCA_POLICE_RATE, rtab, 1024);
301	if (p.peakrate.rate)
302                addattr_l(n, MAX_MSG, TCA_POLICE_PEAKRATE, ptab, 1024);
303	if (avrate)
304		addattr32(n, MAX_MSG, TCA_POLICE_AVRATE, avrate);
305	if (presult)
306		addattr32(n, MAX_MSG, TCA_POLICE_RESULT, presult);
307
308	tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
309	res = 0;
310
311	*argc_p = argc;
312	*argv_p = argv;
313	return res;
314}
315
316int parse_police(int *argc_p, char ***argv_p, int tca_id, struct nlmsghdr *n)
317{
318	return act_parse_police(NULL,argc_p,argv_p,tca_id,n);
319}
320
321int
322print_police(struct action_util *a, FILE *f, struct rtattr *arg)
323{
324	SPRINT_BUF(b1);
325	struct tc_police *p;
326	struct rtattr *tb[TCA_POLICE_MAX+1];
327	unsigned buffer;
328
329	if (arg == NULL)
330		return 0;
331
332	parse_rtattr_nested(tb, TCA_POLICE_MAX, arg);
333
334	if (tb[TCA_POLICE_TBF] == NULL) {
335		fprintf(f, "[NULL police tbf]");
336		return 0;
337	}
338#ifndef STOOPID_8BYTE
339	if (RTA_PAYLOAD(tb[TCA_POLICE_TBF])  < sizeof(*p)) {
340		fprintf(f, "[truncated police tbf]");
341		return -1;
342	}
343#endif
344	p = RTA_DATA(tb[TCA_POLICE_TBF]);
345
346	fprintf(f, " police 0x%x ", p->index);
347	fprintf(f, "rate %s ", sprint_rate(p->rate.rate, b1));
348	buffer = tc_calc_xmitsize(p->rate.rate, p->burst);
349	fprintf(f, "burst %s ", sprint_size(buffer, b1));
350	fprintf(f, "mtu %s ", sprint_size(p->mtu, b1));
351	if (show_raw)
352		fprintf(f, "[%08x] ", p->burst);
353	if (p->peakrate.rate)
354		fprintf(f, "peakrate %s ", sprint_rate(p->peakrate.rate, b1));
355	if (tb[TCA_POLICE_AVRATE])
356		fprintf(f, "avrate %s ", sprint_rate(rta_getattr_u32(tb[TCA_POLICE_AVRATE]), b1));
357	fprintf(f, "action %s", police_action_n2a(p->action, b1, sizeof(b1)));
358	if (tb[TCA_POLICE_RESULT]) {
359		fprintf(f, "/%s ", police_action_n2a(*(int*)RTA_DATA(tb[TCA_POLICE_RESULT]), b1, sizeof(b1)));
360	} else
361		fprintf(f, " ");
362	fprintf(f, "overhead %ub ", p->rate.overhead);
363	fprintf(f, "\nref %d bind %d\n",p->refcnt, p->bindcnt);
364
365	return 0;
366}
367
368int
369tc_print_police(FILE *f, struct rtattr *arg) {
370	return print_police(&police_action_util,f,arg);
371}
372