1 /*
2 * tc_qdisc.c "tc qdisc".
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 * J Hadi Salim: Extension to ingress
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 #include <math.h>
23 #include <malloc.h>
24
25 #include "utils.h"
26 #include "tc_util.h"
27 #include "tc_common.h"
28
usage(void)29 static int usage(void)
30 {
31 fprintf(stderr, "Usage: tc qdisc [ add | del | replace | change | show ] dev STRING\n");
32 fprintf(stderr, " [ handle QHANDLE ] [ root | ingress | clsact | parent CLASSID ]\n");
33 fprintf(stderr, " [ estimator INTERVAL TIME_CONSTANT ]\n");
34 fprintf(stderr, " [ stab [ help | STAB_OPTIONS] ]\n");
35 fprintf(stderr, " [ [ QDISC_KIND ] [ help | OPTIONS ] ]\n");
36 fprintf(stderr, "\n");
37 fprintf(stderr, " tc qdisc show [ dev STRING ] [ ingress | clsact ]\n");
38 fprintf(stderr, "Where:\n");
39 fprintf(stderr, "QDISC_KIND := { [p|b]fifo | tbf | prio | cbq | red | etc. }\n");
40 fprintf(stderr, "OPTIONS := ... try tc qdisc add <desired QDISC_KIND> help\n");
41 fprintf(stderr, "STAB_OPTIONS := ... try tc qdisc add stab help\n");
42 return -1;
43 }
44
tc_qdisc_modify(int cmd,unsigned flags,int argc,char ** argv)45 static int tc_qdisc_modify(int cmd, unsigned flags, int argc, char **argv)
46 {
47 struct qdisc_util *q = NULL;
48 struct tc_estimator est;
49 struct {
50 struct tc_sizespec szopts;
51 __u16 *data;
52 } stab;
53 char d[16];
54 char k[16];
55 struct {
56 struct nlmsghdr n;
57 struct tcmsg t;
58 char buf[TCA_BUF_MAX];
59 } req;
60
61 memset(&req, 0, sizeof(req));
62 memset(&stab, 0, sizeof(stab));
63 memset(&est, 0, sizeof(est));
64 memset(&d, 0, sizeof(d));
65 memset(&k, 0, sizeof(k));
66
67 req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg));
68 req.n.nlmsg_flags = NLM_F_REQUEST|flags;
69 req.n.nlmsg_type = cmd;
70 req.t.tcm_family = AF_UNSPEC;
71
72 while (argc > 0) {
73 if (strcmp(*argv, "dev") == 0) {
74 NEXT_ARG();
75 if (d[0])
76 duparg("dev", *argv);
77 strncpy(d, *argv, sizeof(d)-1);
78 } else if (strcmp(*argv, "handle") == 0) {
79 __u32 handle;
80 if (req.t.tcm_handle)
81 duparg("handle", *argv);
82 NEXT_ARG();
83 if (get_qdisc_handle(&handle, *argv))
84 invarg("invalid qdisc ID", *argv);
85 req.t.tcm_handle = handle;
86 } else if (strcmp(*argv, "root") == 0) {
87 if (req.t.tcm_parent) {
88 fprintf(stderr, "Error: \"root\" is duplicate parent ID\n");
89 return -1;
90 }
91 req.t.tcm_parent = TC_H_ROOT;
92 } else if (strcmp(*argv, "clsact") == 0) {
93 if (req.t.tcm_parent) {
94 fprintf(stderr, "Error: \"clsact\" is a duplicate parent ID\n");
95 return -1;
96 }
97 req.t.tcm_parent = TC_H_CLSACT;
98 strncpy(k, "clsact", sizeof(k) - 1);
99 q = get_qdisc_kind(k);
100 req.t.tcm_handle = TC_H_MAKE(TC_H_CLSACT, 0);
101 NEXT_ARG_FWD();
102 break;
103 } else if (strcmp(*argv, "ingress") == 0) {
104 if (req.t.tcm_parent) {
105 fprintf(stderr, "Error: \"ingress\" is a duplicate parent ID\n");
106 return -1;
107 }
108 req.t.tcm_parent = TC_H_INGRESS;
109 strncpy(k, "ingress", sizeof(k) - 1);
110 q = get_qdisc_kind(k);
111 req.t.tcm_handle = TC_H_MAKE(TC_H_INGRESS, 0);
112 NEXT_ARG_FWD();
113 break;
114 } else if (strcmp(*argv, "parent") == 0) {
115 __u32 handle;
116 NEXT_ARG();
117 if (req.t.tcm_parent)
118 duparg("parent", *argv);
119 if (get_tc_classid(&handle, *argv))
120 invarg("invalid parent ID", *argv);
121 req.t.tcm_parent = handle;
122 } else if (matches(*argv, "estimator") == 0) {
123 if (parse_estimator(&argc, &argv, &est))
124 return -1;
125 } else if (matches(*argv, "stab") == 0) {
126 if (parse_size_table(&argc, &argv, &stab.szopts) < 0)
127 return -1;
128 continue;
129 } else if (matches(*argv, "help") == 0) {
130 usage();
131 } else {
132 strncpy(k, *argv, sizeof(k)-1);
133
134 q = get_qdisc_kind(k);
135 argc--; argv++;
136 break;
137 }
138 argc--; argv++;
139 }
140
141 if (k[0])
142 addattr_l(&req.n, sizeof(req), TCA_KIND, k, strlen(k)+1);
143 if (est.ewma_log)
144 addattr_l(&req.n, sizeof(req), TCA_RATE, &est, sizeof(est));
145
146 if (q) {
147 if (q->parse_qopt) {
148 if (q->parse_qopt(q, argc, argv, &req.n))
149 return 1;
150 } else if (argc) {
151 fprintf(stderr, "qdisc '%s' does not support option parsing\n", k);
152 return -1;
153 }
154 } else {
155 if (argc) {
156 if (matches(*argv, "help") == 0)
157 usage();
158
159 fprintf(stderr, "Garbage instead of arguments \"%s ...\". Try \"tc qdisc help\".\n", *argv);
160 return -1;
161 }
162 }
163
164 if (check_size_table_opts(&stab.szopts)) {
165 struct rtattr *tail;
166
167 if (tc_calc_size_table(&stab.szopts, &stab.data) < 0) {
168 fprintf(stderr, "failed to calculate size table.\n");
169 return -1;
170 }
171
172 tail = NLMSG_TAIL(&req.n);
173 addattr_l(&req.n, sizeof(req), TCA_STAB, NULL, 0);
174 addattr_l(&req.n, sizeof(req), TCA_STAB_BASE, &stab.szopts,
175 sizeof(stab.szopts));
176 if (stab.data)
177 addattr_l(&req.n, sizeof(req), TCA_STAB_DATA, stab.data,
178 stab.szopts.tsize * sizeof(__u16));
179 tail->rta_len = (void *)NLMSG_TAIL(&req.n) - (void *)tail;
180 if (stab.data)
181 free(stab.data);
182 }
183
184 if (d[0]) {
185 int idx;
186
187 ll_init_map(&rth);
188
189 if ((idx = ll_name_to_index(d)) == 0) {
190 fprintf(stderr, "Cannot find device \"%s\"\n", d);
191 return 1;
192 }
193 req.t.tcm_ifindex = idx;
194 }
195
196 if (rtnl_talk(&rth, &req.n, NULL, 0) < 0)
197 return 2;
198
199 return 0;
200 }
201
202 static int filter_ifindex;
203
print_qdisc(const struct sockaddr_nl * who,struct nlmsghdr * n,void * arg)204 int print_qdisc(const struct sockaddr_nl *who,
205 struct nlmsghdr *n,
206 void *arg)
207 {
208 FILE *fp = (FILE*)arg;
209 struct tcmsg *t = NLMSG_DATA(n);
210 int len = n->nlmsg_len;
211 struct rtattr * tb[TCA_MAX+1];
212 struct qdisc_util *q;
213 char abuf[256];
214
215 if (n->nlmsg_type != RTM_NEWQDISC && n->nlmsg_type != RTM_DELQDISC) {
216 fprintf(stderr, "Not a qdisc\n");
217 return 0;
218 }
219 len -= NLMSG_LENGTH(sizeof(*t));
220 if (len < 0) {
221 fprintf(stderr, "Wrong len %d\n", len);
222 return -1;
223 }
224
225 if (filter_ifindex && filter_ifindex != t->tcm_ifindex)
226 return 0;
227
228 memset(tb, 0, sizeof(tb));
229 parse_rtattr(tb, TCA_MAX, TCA_RTA(t), len);
230
231 if (tb[TCA_KIND] == NULL) {
232 fprintf(stderr, "print_qdisc: NULL kind\n");
233 return -1;
234 }
235
236 if (n->nlmsg_type == RTM_DELQDISC)
237 fprintf(fp, "deleted ");
238
239 fprintf(fp, "qdisc %s %x: ", rta_getattr_str(tb[TCA_KIND]), t->tcm_handle>>16);
240 if (filter_ifindex == 0)
241 fprintf(fp, "dev %s ", ll_index_to_name(t->tcm_ifindex));
242 if (t->tcm_parent == TC_H_ROOT)
243 fprintf(fp, "root ");
244 else if (t->tcm_parent) {
245 print_tc_classid(abuf, sizeof(abuf), t->tcm_parent);
246 fprintf(fp, "parent %s ", abuf);
247 }
248 if (t->tcm_info != 1) {
249 fprintf(fp, "refcnt %d ", t->tcm_info);
250 }
251 /* pfifo_fast is generic enough to warrant the hardcoding --JHS */
252
253 if (0 == strcmp("pfifo_fast", RTA_DATA(tb[TCA_KIND])))
254 q = get_qdisc_kind("prio");
255 else
256 q = get_qdisc_kind(RTA_DATA(tb[TCA_KIND]));
257
258 if (tb[TCA_OPTIONS]) {
259 if (q)
260 q->print_qopt(q, fp, tb[TCA_OPTIONS]);
261 else
262 fprintf(fp, "[cannot parse qdisc parameters]");
263 }
264 fprintf(fp, "\n");
265 if (show_details && tb[TCA_STAB]) {
266 print_size_table(fp, " ", tb[TCA_STAB]);
267 fprintf(fp, "\n");
268 }
269 if (show_stats) {
270 struct rtattr *xstats = NULL;
271
272 if (tb[TCA_STATS] || tb[TCA_STATS2] || tb[TCA_XSTATS]) {
273 print_tcstats_attr(fp, tb, " ", &xstats);
274 fprintf(fp, "\n");
275 }
276
277 if (q && xstats && q->print_xstats) {
278 q->print_xstats(q, fp, xstats);
279 fprintf(fp, "\n");
280 }
281 }
282 fflush(fp);
283 return 0;
284 }
285
tc_qdisc_list(int argc,char ** argv)286 static int tc_qdisc_list(int argc, char **argv)
287 {
288 struct tcmsg t;
289 char d[16];
290
291 memset(&t, 0, sizeof(t));
292 t.tcm_family = AF_UNSPEC;
293 memset(&d, 0, sizeof(d));
294
295 while (argc > 0) {
296 if (strcmp(*argv, "dev") == 0) {
297 NEXT_ARG();
298 strncpy(d, *argv, sizeof(d)-1);
299 } else if (strcmp(*argv, "ingress") == 0 ||
300 strcmp(*argv, "clsact") == 0) {
301 if (t.tcm_parent) {
302 fprintf(stderr, "Duplicate parent ID\n");
303 usage();
304 }
305 t.tcm_parent = TC_H_INGRESS;
306 } else if (matches(*argv, "help") == 0) {
307 usage();
308 } else {
309 fprintf(stderr, "What is \"%s\"? Try \"tc qdisc help\".\n", *argv);
310 return -1;
311 }
312
313 argc--; argv++;
314 }
315
316 ll_init_map(&rth);
317
318 if (d[0]) {
319 if ((t.tcm_ifindex = ll_name_to_index(d)) == 0) {
320 fprintf(stderr, "Cannot find device \"%s\"\n", d);
321 return 1;
322 }
323 filter_ifindex = t.tcm_ifindex;
324 }
325
326 if (rtnl_dump_request(&rth, RTM_GETQDISC, &t, sizeof(t)) < 0) {
327 perror("Cannot send dump request");
328 return 1;
329 }
330
331 if (rtnl_dump_filter(&rth, print_qdisc, stdout) < 0) {
332 fprintf(stderr, "Dump terminated\n");
333 return 1;
334 }
335
336 return 0;
337 }
338
do_qdisc(int argc,char ** argv)339 int do_qdisc(int argc, char **argv)
340 {
341 if (argc < 1)
342 return tc_qdisc_list(0, NULL);
343 if (matches(*argv, "add") == 0)
344 return tc_qdisc_modify(RTM_NEWQDISC, NLM_F_EXCL|NLM_F_CREATE, argc-1, argv+1);
345 if (matches(*argv, "change") == 0)
346 return tc_qdisc_modify(RTM_NEWQDISC, 0, argc-1, argv+1);
347 if (matches(*argv, "replace") == 0)
348 return tc_qdisc_modify(RTM_NEWQDISC, NLM_F_CREATE|NLM_F_REPLACE, argc-1, argv+1);
349 if (matches(*argv, "link") == 0)
350 return tc_qdisc_modify(RTM_NEWQDISC, NLM_F_REPLACE, argc-1, argv+1);
351 if (matches(*argv, "delete") == 0)
352 return tc_qdisc_modify(RTM_DELQDISC, 0, argc-1, argv+1);
353 #if 0
354 if (matches(*argv, "get") == 0)
355 return tc_qdisc_get(RTM_GETQDISC, 0, argc-1, argv+1);
356 #endif
357 if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0
358 || matches(*argv, "lst") == 0)
359 return tc_qdisc_list(argc-1, argv+1);
360 if (matches(*argv, "help") == 0) {
361 usage();
362 return 0;
363 }
364 fprintf(stderr, "Command \"%s\" is unknown, try \"tc qdisc help\".\n", *argv);
365 return -1;
366 }
367