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
29 struct action_util police_action_util = {
30 .id = "police",
31 .parse_aopt = act_parse_police,
32 .print_aopt = print_police,
33 };
34
usage(void)35 static 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 ] [ CONTROL ]\n");
40
41 fprintf(stderr, "Where: CONTROL := conform-exceed <EXCEEDACT>[/NOTEXCEEDACT]\n");
42 fprintf(stderr, " Define how to handle packets which exceed (<EXCEEDACT>)\n");
43 fprintf(stderr, " or conform (<NOTEXCEEDACT>) the configured bandwidth limit.\n");
44 fprintf(stderr, " EXCEEDACT/NOTEXCEEDACT := { pipe | ok | reclassify | drop | continue |\n");
45 fprintf(stderr, " goto chain <CHAIN_INDEX> }\n");
46 exit(-1);
47 }
48
explain1(char * arg)49 static void explain1(char *arg)
50 {
51 fprintf(stderr, "Illegal \"%s\"\n", arg);
52 }
53
act_parse_police(struct action_util * a,int * argc_p,char *** argv_p,int tca_id,struct nlmsghdr * n)54 int act_parse_police(struct action_util *a, int *argc_p, char ***argv_p,
55 int tca_id, struct nlmsghdr *n)
56 {
57 int argc = *argc_p;
58 char **argv = *argv_p;
59 int res = -1;
60 int ok = 0;
61 struct tc_police p = { .action = TC_POLICE_RECLASSIFY };
62 __u32 rtab[256];
63 __u32 ptab[256];
64 __u32 avrate = 0;
65 int presult = 0;
66 unsigned buffer = 0, mtu = 0, mpu = 0;
67 unsigned short overhead = 0;
68 unsigned int linklayer = LINKLAYER_ETHERNET; /* Assume ethernet */
69 int Rcell_log = -1, Pcell_log = -1;
70 struct rtattr *tail;
71
72 if (a) /* new way of doing things */
73 NEXT_ARG();
74
75 if (argc <= 0)
76 return -1;
77
78 while (argc > 0) {
79
80 if (matches(*argv, "index") == 0) {
81 NEXT_ARG();
82 if (get_u32(&p.index, *argv, 10)) {
83 fprintf(stderr, "Illegal \"index\"\n");
84 return -1;
85 }
86 } else if (matches(*argv, "burst") == 0 ||
87 strcmp(*argv, "buffer") == 0 ||
88 strcmp(*argv, "maxburst") == 0) {
89 NEXT_ARG();
90 if (buffer) {
91 fprintf(stderr, "Double \"buffer/burst\" spec\n");
92 return -1;
93 }
94 if (get_size_and_cell(&buffer, &Rcell_log, *argv) < 0) {
95 explain1("buffer");
96 return -1;
97 }
98 } else if (strcmp(*argv, "mtu") == 0 ||
99 strcmp(*argv, "minburst") == 0) {
100 NEXT_ARG();
101 if (mtu) {
102 fprintf(stderr, "Double \"mtu/minburst\" spec\n");
103 return -1;
104 }
105 if (get_size_and_cell(&mtu, &Pcell_log, *argv) < 0) {
106 explain1("mtu");
107 return -1;
108 }
109 } else if (strcmp(*argv, "mpu") == 0) {
110 NEXT_ARG();
111 if (mpu) {
112 fprintf(stderr, "Double \"mpu\" spec\n");
113 return -1;
114 }
115 if (get_size(&mpu, *argv)) {
116 explain1("mpu");
117 return -1;
118 }
119 } else if (strcmp(*argv, "rate") == 0) {
120 NEXT_ARG();
121 if (p.rate.rate) {
122 fprintf(stderr, "Double \"rate\" spec\n");
123 return -1;
124 }
125 if (get_rate(&p.rate.rate, *argv)) {
126 explain1("rate");
127 return -1;
128 }
129 } else if (strcmp(*argv, "avrate") == 0) {
130 NEXT_ARG();
131 if (avrate) {
132 fprintf(stderr, "Double \"avrate\" spec\n");
133 return -1;
134 }
135 if (get_rate(&avrate, *argv)) {
136 explain1("avrate");
137 return -1;
138 }
139 } else if (matches(*argv, "peakrate") == 0) {
140 NEXT_ARG();
141 if (p.peakrate.rate) {
142 fprintf(stderr, "Double \"peakrate\" spec\n");
143 return -1;
144 }
145 if (get_rate(&p.peakrate.rate, *argv)) {
146 explain1("peakrate");
147 return -1;
148 }
149 } else if (matches(*argv, "reclassify") == 0 ||
150 matches(*argv, "drop") == 0 ||
151 matches(*argv, "shot") == 0 ||
152 matches(*argv, "continue") == 0 ||
153 matches(*argv, "pass") == 0 ||
154 matches(*argv, "pipe") == 0 ||
155 matches(*argv, "goto") == 0) {
156 if (parse_action_control(&argc, &argv, &p.action, false))
157 return -1;
158 } else if (strcmp(*argv, "conform-exceed") == 0) {
159 NEXT_ARG();
160 if (parse_action_control_slash(&argc, &argv, &p.action,
161 &presult, true))
162 return -1;
163 } else if (matches(*argv, "overhead") == 0) {
164 NEXT_ARG();
165 if (get_u16(&overhead, *argv, 10)) {
166 explain1("overhead"); return -1;
167 }
168 } else if (matches(*argv, "linklayer") == 0) {
169 NEXT_ARG();
170 if (get_linklayer(&linklayer, *argv)) {
171 explain1("linklayer"); return -1;
172 }
173 } else if (strcmp(*argv, "help") == 0) {
174 usage();
175 } else {
176 break;
177 }
178 ok++;
179 argc--; argv++;
180 }
181
182 if (!ok)
183 return -1;
184
185 if (p.rate.rate && avrate)
186 return -1;
187
188 /* Must at least do late binding, use TB or ewma policing */
189 if (!p.rate.rate && !avrate && !p.index) {
190 fprintf(stderr, "\"rate\" or \"avrate\" MUST be specified.\n");
191 return -1;
192 }
193
194 /* When the TB policer is used, burst is required */
195 if (p.rate.rate && !buffer && !avrate) {
196 fprintf(stderr, "\"burst\" requires \"rate\".\n");
197 return -1;
198 }
199
200 if (p.peakrate.rate) {
201 if (!p.rate.rate) {
202 fprintf(stderr, "\"peakrate\" requires \"rate\".\n");
203 return -1;
204 }
205 if (!mtu) {
206 fprintf(stderr, "\"mtu\" is required, if \"peakrate\" is requested.\n");
207 return -1;
208 }
209 }
210
211 if (p.rate.rate) {
212 p.rate.mpu = mpu;
213 p.rate.overhead = overhead;
214 if (tc_calc_rtable(&p.rate, rtab, Rcell_log, mtu,
215 linklayer) < 0) {
216 fprintf(stderr, "POLICE: failed to calculate rate table.\n");
217 return -1;
218 }
219 p.burst = tc_calc_xmittime(p.rate.rate, buffer);
220 }
221 p.mtu = mtu;
222 if (p.peakrate.rate) {
223 p.peakrate.mpu = mpu;
224 p.peakrate.overhead = overhead;
225 if (tc_calc_rtable(&p.peakrate, ptab, Pcell_log, mtu,
226 linklayer) < 0) {
227 fprintf(stderr, "POLICE: failed to calculate peak rate table.\n");
228 return -1;
229 }
230 }
231
232 tail = NLMSG_TAIL(n);
233 addattr_l(n, MAX_MSG, tca_id, NULL, 0);
234 addattr_l(n, MAX_MSG, TCA_POLICE_TBF, &p, sizeof(p));
235 if (p.rate.rate)
236 addattr_l(n, MAX_MSG, TCA_POLICE_RATE, rtab, 1024);
237 if (p.peakrate.rate)
238 addattr_l(n, MAX_MSG, TCA_POLICE_PEAKRATE, ptab, 1024);
239 if (avrate)
240 addattr32(n, MAX_MSG, TCA_POLICE_AVRATE, avrate);
241 if (presult)
242 addattr32(n, MAX_MSG, TCA_POLICE_RESULT, presult);
243
244 tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
245 res = 0;
246
247 *argc_p = argc;
248 *argv_p = argv;
249 return res;
250 }
251
parse_police(int * argc_p,char *** argv_p,int tca_id,struct nlmsghdr * n)252 int parse_police(int *argc_p, char ***argv_p, int tca_id, struct nlmsghdr *n)
253 {
254 return act_parse_police(NULL, argc_p, argv_p, tca_id, n);
255 }
256
print_police(struct action_util * a,FILE * f,struct rtattr * arg)257 int print_police(struct action_util *a, FILE *f, struct rtattr *arg)
258 {
259 SPRINT_BUF(b1);
260 SPRINT_BUF(b2);
261 struct tc_police *p;
262 struct rtattr *tb[TCA_POLICE_MAX+1];
263 unsigned int buffer;
264 unsigned int linklayer;
265
266 if (arg == NULL)
267 return 0;
268
269 parse_rtattr_nested(tb, TCA_POLICE_MAX, arg);
270
271 if (tb[TCA_POLICE_TBF] == NULL) {
272 fprintf(f, "[NULL police tbf]");
273 return 0;
274 }
275 #ifndef STOOPID_8BYTE
276 if (RTA_PAYLOAD(tb[TCA_POLICE_TBF]) < sizeof(*p)) {
277 fprintf(f, "[truncated police tbf]");
278 return -1;
279 }
280 #endif
281 p = RTA_DATA(tb[TCA_POLICE_TBF]);
282
283 fprintf(f, " police 0x%x ", p->index);
284 fprintf(f, "rate %s ", sprint_rate(p->rate.rate, b1));
285 buffer = tc_calc_xmitsize(p->rate.rate, p->burst);
286 fprintf(f, "burst %s ", sprint_size(buffer, b1));
287 fprintf(f, "mtu %s ", sprint_size(p->mtu, b1));
288 if (show_raw)
289 fprintf(f, "[%08x] ", p->burst);
290
291 if (p->peakrate.rate)
292 fprintf(f, "peakrate %s ", sprint_rate(p->peakrate.rate, b1));
293
294 if (tb[TCA_POLICE_AVRATE])
295 fprintf(f, "avrate %s ",
296 sprint_rate(rta_getattr_u32(tb[TCA_POLICE_AVRATE]),
297 b1));
298
299 print_action_control(f, "action ", p->action, "");
300
301 if (tb[TCA_POLICE_RESULT]) {
302 __u32 action = rta_getattr_u32(tb[TCA_POLICE_RESULT]);
303
304 print_action_control(f, "/", action, " ");
305 } else
306 fprintf(f, " ");
307
308 fprintf(f, "overhead %ub ", p->rate.overhead);
309 linklayer = (p->rate.linklayer & TC_LINKLAYER_MASK);
310 if (linklayer > TC_LINKLAYER_ETHERNET || show_details)
311 fprintf(f, "linklayer %s ", sprint_linklayer(linklayer, b2));
312 fprintf(f, "\n\tref %d bind %d", p->refcnt, p->bindcnt);
313 if (show_stats) {
314 if (tb[TCA_POLICE_TM]) {
315 struct tcf_t *tm = RTA_DATA(tb[TCA_POLICE_TM]);
316
317 print_tm(f, tm);
318 }
319 }
320 fprintf(f, "\n");
321
322
323 return 0;
324 }
325
tc_print_police(FILE * f,struct rtattr * arg)326 int tc_print_police(FILE *f, struct rtattr *arg)
327 {
328 return print_police(&police_action_util, f, arg);
329 }
330