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Commit | Line | Data |
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aba5acdf SH |
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> | |
aba5acdf SH |
16 | #include <fcntl.h> |
17 | #include <sys/socket.h> | |
18 | #include <netinet/in.h> | |
19 | #include <arpa/inet.h> | |
20 | #include <string.h> | |
21 | #include <math.h> | |
839c8456 | 22 | #include <malloc.h> |
aba5acdf SH |
23 | |
24 | #include "utils.h" | |
25 | #include "tc_util.h" | |
26 | #include "tc_common.h" | |
27 | ||
11656f1b | 28 | static int usage(void) |
aba5acdf | 29 | { |
e5d179d8 | 30 | fprintf(stderr, "Usage: tc qdisc [ add | del | replace | change | show ] dev STRING\n"); |
8f9afdd5 | 31 | fprintf(stderr, " [ handle QHANDLE ] [ root | ingress | clsact | parent CLASSID ]\n"); |
aba5acdf | 32 | fprintf(stderr, " [ estimator INTERVAL TIME_CONSTANT ]\n"); |
839c8456 | 33 | fprintf(stderr, " [ stab [ help | STAB_OPTIONS] ]\n"); |
063463ef | 34 | fprintf(stderr, " [ ingress_block BLOCK_INDEX ] [ egress_block BLOCK_INDEX ]\n"); |
aba5acdf SH |
35 | fprintf(stderr, " [ [ QDISC_KIND ] [ help | OPTIONS ] ]\n"); |
36 | fprintf(stderr, "\n"); | |
7c581a12 | 37 | fprintf(stderr, " tc qdisc show [ dev STRING ] [ ingress | clsact ] [ invisible ]\n"); |
aba5acdf SH |
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"); | |
839c8456 | 41 | fprintf(stderr, "STAB_OPTIONS := ... try tc qdisc add stab help\n"); |
11656f1b | 42 | return -1; |
aba5acdf SH |
43 | } |
44 | ||
32a121cb | 45 | static int tc_qdisc_modify(int cmd, unsigned int flags, int argc, char **argv) |
aba5acdf | 46 | { |
aba5acdf | 47 | struct qdisc_util *q = NULL; |
9579afb2 | 48 | struct tc_estimator est = {}; |
839c8456 JK |
49 | struct { |
50 | struct tc_sizespec szopts; | |
51 | __u16 *data; | |
d17b136f | 52 | } stab = {}; |
b317557f SH |
53 | char d[IFNAMSIZ] = {}; |
54 | char k[FILTER_NAMESZ] = {}; | |
f307c24e | 55 | struct { |
32a121cb SH |
56 | struct nlmsghdr n; |
57 | struct tcmsg t; | |
58 | char buf[TCA_BUF_MAX]; | |
d17b136f PS |
59 | } req = { |
60 | .n.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg)), | |
61 | .n.nlmsg_flags = NLM_F_REQUEST | flags, | |
62 | .n.nlmsg_type = cmd, | |
63 | .t.tcm_family = AF_UNSPEC, | |
64 | }; | |
063463ef JP |
65 | __u32 ingress_block = 0; |
66 | __u32 egress_block = 0; | |
aba5acdf SH |
67 | |
68 | while (argc > 0) { | |
69 | if (strcmp(*argv, "dev") == 0) { | |
70 | NEXT_ARG(); | |
71 | if (d[0]) | |
72 | duparg("dev", *argv); | |
73 | strncpy(d, *argv, sizeof(d)-1); | |
74 | } else if (strcmp(*argv, "handle") == 0) { | |
75 | __u32 handle; | |
32a121cb | 76 | |
aba5acdf SH |
77 | if (req.t.tcm_handle) |
78 | duparg("handle", *argv); | |
79 | NEXT_ARG(); | |
80 | if (get_qdisc_handle(&handle, *argv)) | |
f1675d61 | 81 | invarg("invalid qdisc ID", *argv); |
aba5acdf SH |
82 | req.t.tcm_handle = handle; |
83 | } else if (strcmp(*argv, "root") == 0) { | |
84 | if (req.t.tcm_parent) { | |
85 | fprintf(stderr, "Error: \"root\" is duplicate parent ID\n"); | |
11656f1b | 86 | return -1; |
aba5acdf SH |
87 | } |
88 | req.t.tcm_parent = TC_H_ROOT; | |
8f9afdd5 DB |
89 | } else if (strcmp(*argv, "clsact") == 0) { |
90 | if (req.t.tcm_parent) { | |
91 | fprintf(stderr, "Error: \"clsact\" is a duplicate parent ID\n"); | |
92 | return -1; | |
93 | } | |
94 | req.t.tcm_parent = TC_H_CLSACT; | |
95 | strncpy(k, "clsact", sizeof(k) - 1); | |
96 | q = get_qdisc_kind(k); | |
97 | req.t.tcm_handle = TC_H_MAKE(TC_H_CLSACT, 0); | |
98 | NEXT_ARG_FWD(); | |
99 | break; | |
aba5acdf SH |
100 | } else if (strcmp(*argv, "ingress") == 0) { |
101 | if (req.t.tcm_parent) { | |
102 | fprintf(stderr, "Error: \"ingress\" is a duplicate parent ID\n"); | |
11656f1b | 103 | return -1; |
aba5acdf SH |
104 | } |
105 | req.t.tcm_parent = TC_H_INGRESS; | |
0d45c4b4 | 106 | strncpy(k, "ingress", sizeof(k) - 1); |
aba5acdf | 107 | q = get_qdisc_kind(k); |
0d45c4b4 DB |
108 | req.t.tcm_handle = TC_H_MAKE(TC_H_INGRESS, 0); |
109 | NEXT_ARG_FWD(); | |
aba5acdf | 110 | break; |
aba5acdf SH |
111 | } else if (strcmp(*argv, "parent") == 0) { |
112 | __u32 handle; | |
32a121cb | 113 | |
aba5acdf SH |
114 | NEXT_ARG(); |
115 | if (req.t.tcm_parent) | |
116 | duparg("parent", *argv); | |
117 | if (get_tc_classid(&handle, *argv)) | |
f1675d61 | 118 | invarg("invalid parent ID", *argv); |
aba5acdf SH |
119 | req.t.tcm_parent = handle; |
120 | } else if (matches(*argv, "estimator") == 0) { | |
121 | if (parse_estimator(&argc, &argv, &est)) | |
122 | return -1; | |
839c8456 JK |
123 | } else if (matches(*argv, "stab") == 0) { |
124 | if (parse_size_table(&argc, &argv, &stab.szopts) < 0) | |
125 | return -1; | |
126 | continue; | |
063463ef JP |
127 | } else if (matches(*argv, "ingress_block") == 0) { |
128 | NEXT_ARG(); | |
129 | if (get_u32(&ingress_block, *argv, 0) || !ingress_block) | |
130 | invarg("invalid ingress block index value", *argv); | |
131 | } else if (matches(*argv, "egress_block") == 0) { | |
132 | NEXT_ARG(); | |
133 | if (get_u32(&egress_block, *argv, 0) || !egress_block) | |
134 | invarg("invalid egress block index value", *argv); | |
aba5acdf SH |
135 | } else if (matches(*argv, "help") == 0) { |
136 | usage(); | |
137 | } else { | |
138 | strncpy(k, *argv, sizeof(k)-1); | |
139 | ||
140 | q = get_qdisc_kind(k); | |
141 | argc--; argv++; | |
142 | break; | |
143 | } | |
144 | argc--; argv++; | |
145 | } | |
146 | ||
147 | if (k[0]) | |
148 | addattr_l(&req.n, sizeof(req), TCA_KIND, k, strlen(k)+1); | |
149 | if (est.ewma_log) | |
150 | addattr_l(&req.n, sizeof(req), TCA_RATE, &est, sizeof(est)); | |
151 | ||
063463ef JP |
152 | if (ingress_block) |
153 | addattr32(&req.n, sizeof(req), | |
154 | TCA_INGRESS_BLOCK, ingress_block); | |
155 | if (egress_block) | |
156 | addattr32(&req.n, sizeof(req), | |
157 | TCA_EGRESS_BLOCK, egress_block); | |
158 | ||
0a502b21 SH |
159 | if (q) { |
160 | if (q->parse_qopt) { | |
927e3cfb | 161 | if (q->parse_qopt(q, argc, argv, &req.n, d)) |
e9e78b0d | 162 | return 1; |
0a502b21 SH |
163 | } else if (argc) { |
164 | fprintf(stderr, "qdisc '%s' does not support option parsing\n", k); | |
165 | return -1; | |
166 | } | |
167 | } else { | |
168 | if (argc) { | |
aba5acdf SH |
169 | if (matches(*argv, "help") == 0) |
170 | usage(); | |
171 | ||
172 | fprintf(stderr, "Garbage instead of arguments \"%s ...\". Try \"tc qdisc help\".\n", *argv); | |
11656f1b | 173 | return -1; |
aba5acdf SH |
174 | } |
175 | } | |
176 | ||
839c8456 JK |
177 | if (check_size_table_opts(&stab.szopts)) { |
178 | struct rtattr *tail; | |
179 | ||
180 | if (tc_calc_size_table(&stab.szopts, &stab.data) < 0) { | |
181 | fprintf(stderr, "failed to calculate size table.\n"); | |
182 | return -1; | |
183 | } | |
184 | ||
c14f9d92 | 185 | tail = addattr_nest(&req.n, sizeof(req), TCA_STAB); |
839c8456 JK |
186 | addattr_l(&req.n, sizeof(req), TCA_STAB_BASE, &stab.szopts, |
187 | sizeof(stab.szopts)); | |
188 | if (stab.data) | |
189 | addattr_l(&req.n, sizeof(req), TCA_STAB_DATA, stab.data, | |
190 | stab.szopts.tsize * sizeof(__u16)); | |
c14f9d92 | 191 | addattr_nest_end(&req.n, tail); |
839c8456 JK |
192 | if (stab.data) |
193 | free(stab.data); | |
194 | } | |
195 | ||
aba5acdf SH |
196 | if (d[0]) { |
197 | int idx; | |
198 | ||
3d0b7439 | 199 | ll_init_map(&rth); |
aba5acdf | 200 | |
b932e6f3 | 201 | idx = ll_name_to_index(d); |
fe99adbc SP |
202 | if (!idx) |
203 | return -nodev(d); | |
aba5acdf SH |
204 | req.t.tcm_ifindex = idx; |
205 | } | |
206 | ||
86bf43c7 | 207 | if (rtnl_talk(&rth, &req.n, NULL) < 0) |
11656f1b | 208 | return 2; |
aba5acdf | 209 | |
aba5acdf SH |
210 | return 0; |
211 | } | |
212 | ||
aba5acdf SH |
213 | static int filter_ifindex; |
214 | ||
ae665a52 | 215 | int print_qdisc(const struct sockaddr_nl *who, |
b932e6f3 | 216 | struct nlmsghdr *n, void *arg) |
aba5acdf | 217 | { |
32a121cb | 218 | FILE *fp = (FILE *)arg; |
aba5acdf SH |
219 | struct tcmsg *t = NLMSG_DATA(n); |
220 | int len = n->nlmsg_len; | |
32a121cb | 221 | struct rtattr *tb[TCA_MAX+1]; |
aba5acdf SH |
222 | struct qdisc_util *q; |
223 | char abuf[256]; | |
224 | ||
225 | if (n->nlmsg_type != RTM_NEWQDISC && n->nlmsg_type != RTM_DELQDISC) { | |
226 | fprintf(stderr, "Not a qdisc\n"); | |
227 | return 0; | |
228 | } | |
229 | len -= NLMSG_LENGTH(sizeof(*t)); | |
230 | if (len < 0) { | |
231 | fprintf(stderr, "Wrong len %d\n", len); | |
232 | return -1; | |
233 | } | |
234 | ||
235 | if (filter_ifindex && filter_ifindex != t->tcm_ifindex) | |
236 | return 0; | |
237 | ||
aba5acdf SH |
238 | parse_rtattr(tb, TCA_MAX, TCA_RTA(t), len); |
239 | ||
240 | if (tb[TCA_KIND] == NULL) { | |
2373fde9 | 241 | fprintf(stderr, "print_qdisc: NULL kind\n"); |
aba5acdf SH |
242 | return -1; |
243 | } | |
244 | ||
c91d262f JP |
245 | open_json_object(NULL); |
246 | ||
aba5acdf | 247 | if (n->nlmsg_type == RTM_DELQDISC) |
c91d262f | 248 | print_bool(PRINT_ANY, "deleted", "deleted ", true); |
aba5acdf | 249 | |
274b63ae RM |
250 | if (n->nlmsg_type == RTM_NEWQDISC && |
251 | (n->nlmsg_flags & NLM_F_CREATE) && | |
252 | (n->nlmsg_flags & NLM_F_REPLACE)) | |
c91d262f | 253 | print_bool(PRINT_ANY, "replaced", "replaced ", true); |
274b63ae RM |
254 | |
255 | if (n->nlmsg_type == RTM_NEWQDISC && | |
256 | (n->nlmsg_flags & NLM_F_CREATE) && | |
257 | (n->nlmsg_flags & NLM_F_EXCL)) | |
c91d262f JP |
258 | print_bool(PRINT_ANY, "added", "added ", true); |
259 | ||
260 | print_string(PRINT_ANY, "kind", "qdisc %s", | |
261 | rta_getattr_str(tb[TCA_KIND])); | |
262 | sprintf(abuf, "%x:", t->tcm_handle >> 16); | |
263 | print_string(PRINT_ANY, "handle", " %s", abuf); | |
264 | if (show_raw) { | |
265 | sprintf(abuf, "[%08x]", t->tcm_handle); | |
266 | print_string(PRINT_FP, NULL, "%s", abuf); | |
267 | } | |
268 | print_string(PRINT_FP, NULL, " ", NULL); | |
d42e1444 | 269 | |
aba5acdf | 270 | if (filter_ifindex == 0) |
2d165c08 | 271 | print_devname(PRINT_ANY, t->tcm_ifindex); |
b932e6f3 | 272 | |
aba5acdf | 273 | if (t->tcm_parent == TC_H_ROOT) |
c91d262f | 274 | print_bool(PRINT_ANY, "root", "root ", true); |
aba5acdf SH |
275 | else if (t->tcm_parent) { |
276 | print_tc_classid(abuf, sizeof(abuf), t->tcm_parent); | |
c91d262f | 277 | print_string(PRINT_ANY, "parent", "parent %s ", abuf); |
aba5acdf | 278 | } |
b932e6f3 SH |
279 | |
280 | if (t->tcm_info != 1) | |
c91d262f | 281 | print_uint(PRINT_ANY, "refcnt", "refcnt %u ", t->tcm_info); |
ae665a52 | 282 | |
b97c6fa7 YM |
283 | if (tb[TCA_HW_OFFLOAD] && |
284 | (rta_getattr_u8(tb[TCA_HW_OFFLOAD]))) | |
285 | print_bool(PRINT_ANY, "offloaded", "offloaded ", true); | |
286 | ||
063463ef JP |
287 | if (tb[TCA_INGRESS_BLOCK] && |
288 | RTA_PAYLOAD(tb[TCA_INGRESS_BLOCK]) >= sizeof(__u32)) { | |
289 | __u32 block = rta_getattr_u32(tb[TCA_INGRESS_BLOCK]); | |
290 | ||
291 | if (block) | |
292 | print_uint(PRINT_ANY, "ingress_block", | |
293 | "ingress_block %u ", block); | |
294 | } | |
295 | ||
296 | if (tb[TCA_EGRESS_BLOCK] && | |
297 | RTA_PAYLOAD(tb[TCA_EGRESS_BLOCK]) >= sizeof(__u32)) { | |
298 | __u32 block = rta_getattr_u32(tb[TCA_EGRESS_BLOCK]); | |
299 | ||
300 | if (block) | |
301 | print_uint(PRINT_ANY, "egress_block", | |
302 | "egress_block %u ", block); | |
303 | } | |
304 | ||
b932e6f3 SH |
305 | /* pfifo_fast is generic enough to warrant the hardcoding --JHS */ |
306 | if (strcmp("pfifo_fast", RTA_DATA(tb[TCA_KIND])) == 0) | |
2373fde9 SH |
307 | q = get_qdisc_kind("prio"); |
308 | else | |
309 | q = get_qdisc_kind(RTA_DATA(tb[TCA_KIND])); | |
ae665a52 | 310 | |
c91d262f | 311 | open_json_object("options"); |
aba5acdf SH |
312 | if (tb[TCA_OPTIONS]) { |
313 | if (q) | |
314 | q->print_qopt(q, fp, tb[TCA_OPTIONS]); | |
315 | else | |
c91d262f JP |
316 | print_string(PRINT_FP, NULL, |
317 | "[cannot parse qdisc parameters]", NULL); | |
aba5acdf | 318 | } |
c91d262f JP |
319 | close_json_object(); |
320 | ||
321 | print_string(PRINT_FP, NULL, "\n", NULL); | |
b932e6f3 | 322 | |
839c8456 JK |
323 | if (show_details && tb[TCA_STAB]) { |
324 | print_size_table(fp, " ", tb[TCA_STAB]); | |
c91d262f | 325 | print_string(PRINT_FP, NULL, "\n", NULL); |
839c8456 | 326 | } |
b932e6f3 | 327 | |
aba5acdf | 328 | if (show_stats) { |
e5879dc6 | 329 | struct rtattr *xstats = NULL; |
330 | ||
331 | if (tb[TCA_STATS] || tb[TCA_STATS2] || tb[TCA_XSTATS]) { | |
332 | print_tcstats_attr(fp, tb, " ", &xstats); | |
c91d262f | 333 | print_string(PRINT_FP, NULL, "\n", NULL); |
aba5acdf | 334 | } |
649b0755 | 335 | |
e5879dc6 | 336 | if (q && xstats && q->print_xstats) { |
337 | q->print_xstats(q, fp, xstats); | |
c91d262f | 338 | print_string(PRINT_FP, NULL, "\n", NULL); |
aba5acdf SH |
339 | } |
340 | } | |
c91d262f | 341 | close_json_object(); |
aba5acdf SH |
342 | fflush(fp); |
343 | return 0; | |
344 | } | |
345 | ||
d1f28cf1 | 346 | static int tc_qdisc_list(int argc, char **argv) |
aba5acdf | 347 | { |
d17b136f | 348 | struct tcmsg t = { .tcm_family = AF_UNSPEC }; |
b317557f | 349 | char d[IFNAMSIZ] = {}; |
7c581a12 | 350 | bool dump_invisible = false; |
ae665a52 | 351 | |
aba5acdf SH |
352 | while (argc > 0) { |
353 | if (strcmp(*argv, "dev") == 0) { | |
354 | NEXT_ARG(); | |
355 | strncpy(d, *argv, sizeof(d)-1); | |
32a121cb | 356 | } else if (strcmp(*argv, "ingress") == 0 || |
8f9afdd5 | 357 | strcmp(*argv, "clsact") == 0) { |
b932e6f3 SH |
358 | if (t.tcm_parent) { |
359 | fprintf(stderr, "Duplicate parent ID\n"); | |
360 | usage(); | |
361 | } | |
362 | t.tcm_parent = TC_H_INGRESS; | |
aba5acdf SH |
363 | } else if (matches(*argv, "help") == 0) { |
364 | usage(); | |
7c581a12 JK |
365 | } else if (strcmp(*argv, "invisible") == 0) { |
366 | dump_invisible = true; | |
aba5acdf SH |
367 | } else { |
368 | fprintf(stderr, "What is \"%s\"? Try \"tc qdisc help\".\n", *argv); | |
369 | return -1; | |
370 | } | |
371 | ||
372 | argc--; argv++; | |
373 | } | |
374 | ||
3d0b7439 | 375 | ll_init_map(&rth); |
aba5acdf SH |
376 | |
377 | if (d[0]) { | |
b932e6f3 | 378 | t.tcm_ifindex = ll_name_to_index(d); |
fe99adbc SP |
379 | if (!t.tcm_ifindex) |
380 | return -nodev(d); | |
aba5acdf SH |
381 | filter_ifindex = t.tcm_ifindex; |
382 | } | |
383 | ||
7c581a12 JK |
384 | if (dump_invisible) { |
385 | struct { | |
386 | struct nlmsghdr n; | |
387 | struct tcmsg t; | |
388 | char buf[256]; | |
389 | } req = { | |
390 | .n.nlmsg_type = RTM_GETQDISC, | |
391 | .n.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg)), | |
392 | }; | |
393 | ||
394 | req.t.tcm_family = AF_UNSPEC; | |
395 | ||
396 | addattr(&req.n, 256, TCA_DUMP_INVISIBLE); | |
397 | if (rtnl_dump_request_n(&rth, &req.n) < 0) { | |
398 | perror("Cannot send dump request"); | |
399 | return 1; | |
400 | } | |
401 | ||
402 | } else if (rtnl_dump_request(&rth, RTM_GETQDISC, &t, sizeof(t)) < 0) { | |
aba5acdf | 403 | perror("Cannot send dump request"); |
11656f1b | 404 | return 1; |
aba5acdf SH |
405 | } |
406 | ||
c91d262f | 407 | new_json_obj(json); |
3d0b7439 | 408 | if (rtnl_dump_filter(&rth, print_qdisc, stdout) < 0) { |
aba5acdf | 409 | fprintf(stderr, "Dump terminated\n"); |
11656f1b | 410 | return 1; |
aba5acdf | 411 | } |
c91d262f | 412 | delete_json_obj(); |
aba5acdf | 413 | |
aba5acdf SH |
414 | return 0; |
415 | } | |
416 | ||
417 | int do_qdisc(int argc, char **argv) | |
418 | { | |
419 | if (argc < 1) | |
420 | return tc_qdisc_list(0, NULL); | |
421 | if (matches(*argv, "add") == 0) | |
422 | return tc_qdisc_modify(RTM_NEWQDISC, NLM_F_EXCL|NLM_F_CREATE, argc-1, argv+1); | |
423 | if (matches(*argv, "change") == 0) | |
424 | return tc_qdisc_modify(RTM_NEWQDISC, 0, argc-1, argv+1); | |
425 | if (matches(*argv, "replace") == 0) | |
426 | return tc_qdisc_modify(RTM_NEWQDISC, NLM_F_CREATE|NLM_F_REPLACE, argc-1, argv+1); | |
427 | if (matches(*argv, "link") == 0) | |
428 | return tc_qdisc_modify(RTM_NEWQDISC, NLM_F_REPLACE, argc-1, argv+1); | |
429 | if (matches(*argv, "delete") == 0) | |
430 | return tc_qdisc_modify(RTM_DELQDISC, 0, argc-1, argv+1); | |
431 | #if 0 | |
432 | if (matches(*argv, "get") == 0) | |
433 | return tc_qdisc_get(RTM_GETQDISC, 0, argc-1, argv+1); | |
434 | #endif | |
435 | if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0 | |
436 | || matches(*argv, "lst") == 0) | |
437 | return tc_qdisc_list(argc-1, argv+1); | |
e5d179d8 | 438 | if (matches(*argv, "help") == 0) { |
aba5acdf | 439 | usage(); |
e5d179d8 | 440 | return 0; |
32a121cb | 441 | } |
aba5acdf SH |
442 | fprintf(stderr, "Command \"%s\" is unknown, try \"tc qdisc help\".\n", *argv); |
443 | return -1; | |
444 | } | |
d0bcedd5 JP |
445 | |
446 | struct tc_qdisc_block_exists_ctx { | |
447 | __u32 block_index; | |
448 | bool found; | |
449 | }; | |
450 | ||
451 | static int tc_qdisc_block_exists_cb(const struct sockaddr_nl *who, | |
452 | struct nlmsghdr *n, void *arg) | |
453 | { | |
454 | struct tc_qdisc_block_exists_ctx *ctx = arg; | |
455 | struct tcmsg *t = NLMSG_DATA(n); | |
456 | struct rtattr *tb[TCA_MAX+1]; | |
457 | int len = n->nlmsg_len; | |
458 | ||
459 | if (n->nlmsg_type != RTM_NEWQDISC) | |
460 | return 0; | |
461 | ||
462 | len -= NLMSG_LENGTH(sizeof(*t)); | |
463 | if (len < 0) | |
464 | return -1; | |
465 | ||
466 | parse_rtattr(tb, TCA_MAX, TCA_RTA(t), len); | |
467 | ||
468 | if (tb[TCA_KIND] == NULL) | |
469 | return -1; | |
470 | ||
471 | if (tb[TCA_INGRESS_BLOCK] && | |
472 | RTA_PAYLOAD(tb[TCA_INGRESS_BLOCK]) >= sizeof(__u32)) { | |
473 | __u32 block = rta_getattr_u32(tb[TCA_INGRESS_BLOCK]); | |
474 | ||
475 | if (block == ctx->block_index) | |
476 | ctx->found = true; | |
477 | } | |
478 | ||
479 | if (tb[TCA_EGRESS_BLOCK] && | |
480 | RTA_PAYLOAD(tb[TCA_EGRESS_BLOCK]) >= sizeof(__u32)) { | |
481 | __u32 block = rta_getattr_u32(tb[TCA_EGRESS_BLOCK]); | |
482 | ||
483 | if (block == ctx->block_index) | |
484 | ctx->found = true; | |
485 | } | |
486 | return 0; | |
487 | } | |
488 | ||
489 | bool tc_qdisc_block_exists(__u32 block_index) | |
490 | { | |
491 | struct tc_qdisc_block_exists_ctx ctx = { .block_index = block_index }; | |
492 | struct tcmsg t = { .tcm_family = AF_UNSPEC }; | |
493 | ||
494 | if (rtnl_dump_request(&rth, RTM_GETQDISC, &t, sizeof(t)) < 0) { | |
495 | perror("Cannot send dump request"); | |
496 | return false; | |
497 | } | |
498 | ||
499 | if (rtnl_dump_filter(&rth, tc_qdisc_block_exists_cb, &ctx) < 0) { | |
500 | perror("Dump terminated\n"); | |
501 | return false; | |
502 | } | |
503 | ||
504 | return ctx.found; | |
505 | } |