libnl  3.5.0
tc.c
1 /* SPDX-License-Identifier: LGPL-2.1-only */
2 /*
3  * lib/route/tc.c Traffic Control
4  *
5  * This library is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU Lesser General Public
7  * License as published by the Free Software Foundation version 2.1
8  * of the License.
9  *
10  * Copyright (c) 2003-2011 Thomas Graf <tgraf@suug.ch>
11  */
12 
13 /**
14  * @ingroup rtnl
15  * @defgroup tc Traffic Control
16  * @{
17  */
18 
19 #include <netlink-private/netlink.h>
20 #include <netlink-private/tc.h>
21 #include <netlink/netlink.h>
22 #include <netlink/utils.h>
23 #include <netlink/route/rtnl.h>
24 #include <netlink/route/link.h>
25 #include <netlink/route/tc.h>
26 #include <netlink-private/route/tc-api.h>
27 
28 #include "netlink-private/utils.h"
29 
30 /** @cond SKIP */
31 
32 static struct nl_list_head tc_ops_list[__RTNL_TC_TYPE_MAX];
33 static struct rtnl_tc_type_ops *tc_type_ops[__RTNL_TC_TYPE_MAX];
34 
35 static struct nla_policy tc_policy[TCA_MAX+1] = {
36  [TCA_KIND] = { .type = NLA_STRING,
37  .maxlen = TCKINDSIZ },
38  [TCA_CHAIN] = { .type = NLA_U32 },
39  [TCA_STATS] = { .minlen = sizeof(struct tc_stats) },
40  [TCA_STATS2] = { .type = NLA_NESTED },
41 };
42 
43 int tca_parse(struct nlattr **tb, int maxattr, struct rtnl_tc *g,
44  const struct nla_policy *policy)
45 {
46 
47  if (g->ce_mask & TCA_ATTR_OPTS)
48  return nla_parse(tb, maxattr,
49  (struct nlattr *) g->tc_opts->d_data,
50  g->tc_opts->d_size, policy);
51  else {
52  /* Ugly but tb[] must be in a defined state even if no
53  * attributes can be found. */
54  memset(tb, 0, sizeof(struct nlattr *) * (maxattr + 1));
55  return 0;
56  }
57 }
58 
59 static struct nla_policy tc_stats2_policy[TCA_STATS_MAX+1] = {
60  [TCA_STATS_BASIC] = { .minlen = sizeof(struct gnet_stats_basic) },
61  [TCA_STATS_RATE_EST] = { .minlen = sizeof(struct gnet_stats_rate_est) },
62  [TCA_STATS_QUEUE] = { .minlen = sizeof(struct gnet_stats_queue) },
63 };
64 
65 int rtnl_tc_msg_parse(struct nlmsghdr *n, struct rtnl_tc *tc)
66 {
67  struct nl_cache *link_cache;
68  struct rtnl_tc_ops *ops;
69  struct nlattr *tb[TCA_MAX + 1];
70  char kind[TCKINDSIZ];
71  struct tcmsg *tm;
72  int err;
73 
74  tc->ce_msgtype = n->nlmsg_type;
75 
76  err = nlmsg_parse(n, sizeof(*tm), tb, TCA_MAX, tc_policy);
77  if (err < 0)
78  return err;
79 
80  if (tb[TCA_KIND] == NULL)
81  return -NLE_MISSING_ATTR;
82 
83  nla_strlcpy(kind, tb[TCA_KIND], sizeof(kind));
84  rtnl_tc_set_kind(tc, kind);
85 
86  if (tb[TCA_CHAIN])
87  rtnl_tc_set_chain(tc, nla_get_u32(tb[TCA_CHAIN]));
88 
89  tm = nlmsg_data(n);
90  tc->tc_family = tm->tcm_family;
91  tc->tc_ifindex = tm->tcm_ifindex;
92  tc->tc_handle = tm->tcm_handle;
93  tc->tc_parent = tm->tcm_parent;
94  tc->tc_info = tm->tcm_info;
95 
96  tc->ce_mask |= (TCA_ATTR_FAMILY | TCA_ATTR_IFINDEX | TCA_ATTR_HANDLE|
97  TCA_ATTR_PARENT | TCA_ATTR_INFO);
98 
99  if (tb[TCA_OPTIONS]) {
100  tc->tc_opts = nl_data_alloc_attr(tb[TCA_OPTIONS]);
101  if (!tc->tc_opts)
102  return -NLE_NOMEM;
103  tc->ce_mask |= TCA_ATTR_OPTS;
104  }
105 
106  if (tb[TCA_STATS2]) {
107  struct nlattr *tbs[TCA_STATS_MAX + 1];
108 
109  err = nla_parse_nested(tbs, TCA_STATS_MAX, tb[TCA_STATS2],
110  tc_stats2_policy);
111  if (err < 0)
112  return err;
113 
114  if (tbs[TCA_STATS_BASIC]) {
115  struct gnet_stats_basic *bs;
116 
117  bs = nla_data(tbs[TCA_STATS_BASIC]);
118  tc->tc_stats[RTNL_TC_BYTES] = bs->bytes;
119  tc->tc_stats[RTNL_TC_PACKETS] = bs->packets;
120  }
121 
122  if (tbs[TCA_STATS_RATE_EST]) {
123  struct gnet_stats_rate_est *re;
124 
125  re = nla_data(tbs[TCA_STATS_RATE_EST]);
126  tc->tc_stats[RTNL_TC_RATE_BPS] = re->bps;
127  tc->tc_stats[RTNL_TC_RATE_PPS] = re->pps;
128  }
129 
130  if (tbs[TCA_STATS_QUEUE]) {
131  struct gnet_stats_queue *q;
132 
133  q = nla_data(tbs[TCA_STATS_QUEUE]);
134  tc->tc_stats[RTNL_TC_QLEN] = q->qlen;
135  tc->tc_stats[RTNL_TC_BACKLOG] = q->backlog;
136  tc->tc_stats[RTNL_TC_DROPS] = q->drops;
137  tc->tc_stats[RTNL_TC_REQUEUES] = q->requeues;
138  tc->tc_stats[RTNL_TC_OVERLIMITS] = q->overlimits;
139  }
140 
141  tc->ce_mask |= TCA_ATTR_STATS;
142 
143  if (tbs[TCA_STATS_APP]) {
144  tc->tc_xstats = nl_data_alloc_attr(tbs[TCA_STATS_APP]);
145  if (tc->tc_xstats == NULL)
146  return -NLE_NOMEM;
147  tc->ce_mask |= TCA_ATTR_XSTATS;
148  } else
149  goto compat_xstats;
150  } else {
151  if (tb[TCA_STATS]) {
152  struct tc_stats *st = nla_data(tb[TCA_STATS]);
153 
154  tc->tc_stats[RTNL_TC_BYTES] = st->bytes;
155  tc->tc_stats[RTNL_TC_PACKETS] = st->packets;
156  tc->tc_stats[RTNL_TC_RATE_BPS] = st->bps;
157  tc->tc_stats[RTNL_TC_RATE_PPS] = st->pps;
158  tc->tc_stats[RTNL_TC_QLEN] = st->qlen;
159  tc->tc_stats[RTNL_TC_BACKLOG] = st->backlog;
160  tc->tc_stats[RTNL_TC_DROPS] = st->drops;
161  tc->tc_stats[RTNL_TC_OVERLIMITS]= st->overlimits;
162 
163  tc->ce_mask |= TCA_ATTR_STATS;
164  }
165 
166 compat_xstats:
167  if (tb[TCA_XSTATS]) {
168  tc->tc_xstats = nl_data_alloc_attr(tb[TCA_XSTATS]);
169  if (tc->tc_xstats == NULL)
170  return -NLE_NOMEM;
171  tc->ce_mask |= TCA_ATTR_XSTATS;
172  }
173  }
174 
175  ops = rtnl_tc_get_ops(tc);
176  if (ops && ops->to_msg_parser) {
177  void *data = rtnl_tc_data(tc);
178 
179  if (!data)
180  return -NLE_NOMEM;
181 
182  err = ops->to_msg_parser(tc, data);
183  if (err < 0)
184  return err;
185  }
186 
187  if ((link_cache = __nl_cache_mngt_require("route/link"))) {
188  struct rtnl_link *link;
189 
190  if ((link = rtnl_link_get(link_cache, tc->tc_ifindex))) {
191  rtnl_tc_set_link(tc, link);
192 
193  /* rtnl_tc_set_link incs refcnt */
194  rtnl_link_put(link);
195  }
196  }
197 
198  return 0;
199 }
200 
201 int rtnl_tc_msg_build(struct rtnl_tc *tc, int type, int flags,
202  struct nl_msg **result)
203 {
204  struct nl_msg *msg;
205  struct rtnl_tc_ops *ops;
206  struct tcmsg tchdr = {
207  .tcm_family = AF_UNSPEC,
208  .tcm_ifindex = tc->tc_ifindex,
209  .tcm_handle = tc->tc_handle,
210  .tcm_parent = tc->tc_parent,
211  };
212  int err;
213 
214  msg = nlmsg_alloc_simple(type, flags);
215  if (!msg)
216  return -NLE_NOMEM;
217 
218  if (nlmsg_append(msg, &tchdr, sizeof(tchdr), NLMSG_ALIGNTO) < 0) {
219  err = -NLE_MSGSIZE;
220  goto out_err;
221  }
222 
223  if (tc->ce_mask & TCA_ATTR_KIND)
224  NLA_PUT_STRING(msg, TCA_KIND, tc->tc_kind);
225 
226  if (tc->ce_mask & TCA_ATTR_CHAIN)
227  NLA_PUT_U32(msg, TCA_CHAIN, tc->tc_chain);
228 
229  ops = rtnl_tc_get_ops(tc);
230  if (ops && (ops->to_msg_fill || ops->to_msg_fill_raw)) {
231  struct nlattr *opts;
232  void *data = rtnl_tc_data(tc);
233 
234  if (ops->to_msg_fill) {
235  if (!(opts = nla_nest_start(msg, TCA_OPTIONS))) {
236  err = -NLE_NOMEM;
237  goto out_err;
238  }
239 
240  if ((err = ops->to_msg_fill(tc, data, msg)) < 0)
241  goto out_err;
242 
243  if (strcmp("cgroup", tc->tc_kind))
244  nla_nest_end(msg, opts);
245  else
246  nla_nest_end_keep_empty(msg, opts);
247  } else if ((err = ops->to_msg_fill_raw(tc, data, msg)) < 0)
248  goto out_err;
249  }
250 
251  *result = msg;
252  return 0;
253 
254 nla_put_failure:
255  err = -NLE_NOMEM;
256 out_err:
257  nlmsg_free(msg);
258  return err;
259 }
260 
261 
262 /** @endcond */
263 
264 /**
265  * @name Attributes
266  * @{
267  */
268 
269 /**
270  * Set interface index of traffic control object
271  * @arg tc traffic control object
272  * @arg ifindex interface index.
273  *
274  * Sets the interface index of a traffic control object. The interface
275  * index defines the network device which this tc object is attached to.
276  * This function will overwrite any network device assigned with previous
277  * calls to rtnl_tc_set_ifindex() or rtnl_tc_set_link().
278  */
279 void rtnl_tc_set_ifindex(struct rtnl_tc *tc, int ifindex)
280 {
281  /* Obsolete possible old link reference */
282  rtnl_link_put(tc->tc_link);
283  tc->tc_link = NULL;
284  tc->ce_mask &= ~TCA_ATTR_LINK;
285 
286  tc->tc_ifindex = ifindex;
287  tc->ce_mask |= TCA_ATTR_IFINDEX;
288 }
289 
290 /**
291  * Return interface index of traffic control object
292  * @arg tc traffic control object
293  */
294 int rtnl_tc_get_ifindex(struct rtnl_tc *tc)
295 {
296  return tc->tc_ifindex;
297 }
298 
299 /**
300  * Set link of traffic control object
301  * @arg tc traffic control object
302  * @arg link link object
303  *
304  * Sets the link of a traffic control object. This function serves
305  * the same purpose as rtnl_tc_set_ifindex() but due to the continued
306  * allowed access to the link object it gives it the possibility to
307  * retrieve sane default values for the the MTU and the linktype.
308  * Always prefer this function over rtnl_tc_set_ifindex() if you can
309  * spare to have an additional link object around.
310  */
311 void rtnl_tc_set_link(struct rtnl_tc *tc, struct rtnl_link *link)
312 {
313  rtnl_link_put(tc->tc_link);
314 
315  if (!link)
316  return;
317  if (!link->l_index)
318  BUG();
319 
320  nl_object_get(OBJ_CAST(link));
321  tc->tc_link = link;
322  tc->tc_ifindex = link->l_index;
323  tc->ce_mask |= TCA_ATTR_LINK | TCA_ATTR_IFINDEX;
324 }
325 
326 /**
327  * Get link of traffic control object
328  * @arg tc traffic control object
329  *
330  * Returns the link of a traffic control object. The link is only
331  * returned if it has been set before via rtnl_tc_set_link() or
332  * if a link cache was available while parsing the tc object. This
333  * function may still return NULL even if an ifindex is assigned to
334  * the tc object. It will _not_ look up the link by itself.
335  *
336  * @note The returned link will have its reference counter incremented.
337  * It is in the responsibility of the caller to return the
338  * reference.
339  *
340  * @return link object or NULL if not set.
341  */
342 struct rtnl_link *rtnl_tc_get_link(struct rtnl_tc *tc)
343 {
344  if (tc->tc_link) {
345  nl_object_get(OBJ_CAST(tc->tc_link));
346  return tc->tc_link;
347  }
348 
349  return NULL;
350 }
351 
352 /**
353  * Set the Maximum Transmission Unit (MTU) of traffic control object
354  * @arg tc traffic control object
355  * @arg mtu largest packet size expected
356  *
357  * Sets the MTU of a traffic control object. Not all traffic control
358  * objects will make use of this but it helps while calculating rate
359  * tables. This value is typically derived directly from the link
360  * the tc object is attached to if the link has been assigned via
361  * rtnl_tc_set_link(). It is usually not necessary to set the MTU
362  * manually, this function is provided to allow overwriting the derived
363  * value.
364  */
365 void rtnl_tc_set_mtu(struct rtnl_tc *tc, uint32_t mtu)
366 {
367  tc->tc_mtu = mtu;
368  tc->ce_mask |= TCA_ATTR_MTU;
369 }
370 
371 /**
372  * Return the MTU of traffic control object
373  * @arg tc traffic control object
374  *
375  * Returns the MTU of a traffic control object which has been set via:
376  * -# User specified value set via rtnl_tc_set_mtu()
377  * -# Dervied from link set via rtnl_tc_set_link()
378  * -# Fall back to default: ethernet = 1500
379  */
380 uint32_t rtnl_tc_get_mtu(struct rtnl_tc *tc)
381 {
382  if (tc->ce_mask & TCA_ATTR_MTU)
383  return tc->tc_mtu;
384  else if (tc->ce_mask & TCA_ATTR_LINK)
385  return tc->tc_link->l_mtu;
386  else
387  return 1500; /* default to ethernet */
388 }
389 
390 /**
391  * Set the Minimum Packet Unit (MPU) of a traffic control object
392  * @arg tc traffic control object
393  * @arg mpu minimum packet size expected
394  *
395  * Sets the MPU of a traffic contorl object. It specifies the minimum
396  * packet size to ever hit this traffic control object. Not all traffic
397  * control objects will make use of this but it helps while calculating
398  * rate tables.
399  */
400 void rtnl_tc_set_mpu(struct rtnl_tc *tc, uint32_t mpu)
401 {
402  tc->tc_mpu = mpu;
403  tc->ce_mask |= TCA_ATTR_MPU;
404 }
405 
406 /**
407  * Return the Minimum Packet Unit (MPU) of a traffic control object
408  * @arg tc traffic control object
409  *
410  * @return The MPU previously set via rtnl_tc_set_mpu() or 0.
411  */
412 uint32_t rtnl_tc_get_mpu(struct rtnl_tc *tc)
413 {
414  return tc->tc_mpu;
415 }
416 
417 /**
418  * Set per packet overhead of a traffic control object
419  * @arg tc traffic control object
420  * @arg overhead overhead per packet in bytes
421  *
422  * Sets the per packet overhead in bytes occuring on the link not seen
423  * by the kernel. This value can be used to correct size calculations
424  * if the packet size on the wire does not match the packet sizes seen
425  * in the network stack. Not all traffic control objects will make use
426  * this but it helps while calculating accurate packet sizes in the
427  * kernel.
428  */
429 void rtnl_tc_set_overhead(struct rtnl_tc *tc, uint32_t overhead)
430 {
431  tc->tc_overhead = overhead;
432  tc->ce_mask |= TCA_ATTR_OVERHEAD;
433 }
434 
435 /**
436  * Return per packet overhead of a traffic control object
437  * @arg tc traffic control object
438  *
439  * @return The overhead previously set by rtnl_tc_set_overhead() or 0.
440  */
441 uint32_t rtnl_tc_get_overhead(struct rtnl_tc *tc)
442 {
443  return tc->tc_overhead;
444 }
445 
446 /**
447  * Set the linktype of a traffic control object
448  * @arg tc traffic control object
449  * @arg type type of link (e.g. ARPHRD_ATM, ARPHRD_ETHER)
450  *
451  * Overwrites the type of link this traffic control object is attached to.
452  * This value is typically derived from the link this tc object is attached
453  * if the link has been assigned via rtnl_tc_set_link(). It is usually not
454  * necessary to set the linktype manually. This function is provided to
455  * allow overwriting the linktype.
456  */
457 void rtnl_tc_set_linktype(struct rtnl_tc *tc, uint32_t type)
458 {
459  tc->tc_linktype = type;
460  tc->ce_mask |= TCA_ATTR_LINKTYPE;
461 }
462 
463 /**
464  * Return the linktype of a traffic control object
465  * @arg tc traffic control object
466  *
467  * Returns the linktype of the link the traffic control object is attached to:
468  * -# User specified value via rtnl_tc_set_linktype()
469  * -# Value derived from link set via rtnl_tc_set_link()
470  * -# Default fall-back: ARPHRD_ETHER
471  */
472 uint32_t rtnl_tc_get_linktype(struct rtnl_tc *tc)
473 {
474  if (tc->ce_mask & TCA_ATTR_LINKTYPE)
475  return tc->tc_linktype;
476  else if (tc->ce_mask & TCA_ATTR_LINK)
477  return tc->tc_link->l_arptype;
478  else
479  return ARPHRD_ETHER; /* default to ethernet */
480 }
481 
482 /**
483  * Set identifier of traffic control object
484  * @arg tc traffic control object
485  * @arg id unique identifier
486  */
487 void rtnl_tc_set_handle(struct rtnl_tc *tc, uint32_t id)
488 {
489  tc->tc_handle = id;
490  tc->ce_mask |= TCA_ATTR_HANDLE;
491 }
492 
493 /**
494  * Return identifier of a traffic control object
495  * @arg tc traffic control object
496  */
497 uint32_t rtnl_tc_get_handle(struct rtnl_tc *tc)
498 {
499  return tc->tc_handle;
500 }
501 
502 /**
503  * Set the parent identifier of a traffic control object
504  * @arg tc traffic control object
505  * @arg parent identifier of parent traffif control object
506  *
507  */
508 void rtnl_tc_set_parent(struct rtnl_tc *tc, uint32_t parent)
509 {
510  tc->tc_parent = parent;
511  tc->ce_mask |= TCA_ATTR_PARENT;
512 }
513 
514 /**
515  * Return parent identifier of a traffic control object
516  * @arg tc traffic control object
517  */
518 uint32_t rtnl_tc_get_parent(struct rtnl_tc *tc)
519 {
520  return tc->tc_parent;
521 }
522 
523 /**
524  * Define the type of traffic control object
525  * @arg tc traffic control object
526  * @arg kind name of the tc object type
527  *
528  * @return 0 on success or a negative error code
529  */
530 int rtnl_tc_set_kind(struct rtnl_tc *tc, const char *kind)
531 {
532  if (tc->ce_mask & TCA_ATTR_KIND)
533  return -NLE_EXIST;
534 
535  if ( !kind
536  || strlen (kind) >= sizeof (tc->tc_kind))
537  return -NLE_INVAL;
538 
539  _nl_strncpy(tc->tc_kind, kind, sizeof(tc->tc_kind));
540 
541  tc->ce_mask |= TCA_ATTR_KIND;
542 
543  /* Force allocation of data */
544  rtnl_tc_data(tc);
545 
546  return 0;
547 }
548 
549 /**
550  * Return kind of traffic control object
551  * @arg tc traffic control object
552  *
553  * @return Kind of traffic control object or NULL if not set.
554  */
555 char *rtnl_tc_get_kind(struct rtnl_tc *tc)
556 {
557  if (tc->ce_mask & TCA_ATTR_KIND)
558  return tc->tc_kind;
559  else
560  return NULL;
561 }
562 
563 /**
564  * Return value of a statistical counter of a traffic control object
565  * @arg tc traffic control object
566  * @arg id identifier of statistical counter
567  *
568  * @return Value of requested statistic counter or 0.
569  */
570 uint64_t rtnl_tc_get_stat(struct rtnl_tc *tc, enum rtnl_tc_stat id)
571 {
572  if ((unsigned int) id > RTNL_TC_STATS_MAX)
573  return 0;
574 
575  return tc->tc_stats[id];
576 }
577 
578 /**
579  * Set the chain index of a traffic control object
580  * @arg tc traffic control object
581  * @arg chain chain index of traffic control object
582  *
583  */
584 void rtnl_tc_set_chain(struct rtnl_tc *tc, uint32_t chain)
585 {
586  tc->tc_chain = chain;
587  tc->ce_mask |= TCA_ATTR_CHAIN;
588 }
589 
590 /**
591  * Return chain index of traffic control object
592  * @arg tc traffic control object
593  * @arg out_value output argument.
594  *
595  * @return 0 of the output value was successfully returned, or a negative
596  * error code on failure.
597  */
598 int rtnl_tc_get_chain(struct rtnl_tc *tc, uint32_t *out_value)
599 {
600  if (!(tc->ce_mask & TCA_ATTR_CHAIN))
601  return -NLE_MISSING_ATTR;
602  *out_value = tc->tc_chain;
603  return 0;
604 }
605 
606 /** @} */
607 
608 /**
609  * @name Utilities
610  * @{
611  */
612 
613 static const struct trans_tbl tc_stats[] = {
614  __ADD(RTNL_TC_PACKETS, packets),
615  __ADD(RTNL_TC_BYTES, bytes),
616  __ADD(RTNL_TC_RATE_BPS, rate_bps),
617  __ADD(RTNL_TC_RATE_PPS, rate_pps),
618  __ADD(RTNL_TC_QLEN, qlen),
619  __ADD(RTNL_TC_BACKLOG, backlog),
620  __ADD(RTNL_TC_DROPS, drops),
621  __ADD(RTNL_TC_REQUEUES, requeues),
622  __ADD(RTNL_TC_OVERLIMITS, overlimits),
623 };
624 
625 char *rtnl_tc_stat2str(enum rtnl_tc_stat st, char *buf, size_t len)
626 {
627  return __type2str(st, buf, len, tc_stats, ARRAY_SIZE(tc_stats));
628 }
629 
630 int rtnl_tc_str2stat(const char *name)
631 {
632  return __str2type(name, tc_stats, ARRAY_SIZE(tc_stats));
633 }
634 
635 /**
636  * Calculate time required to transmit buffer at a specific rate
637  * @arg bufsize Size of buffer to be transmited in bytes.
638  * @arg rate Transmit rate in bytes per second.
639  *
640  * Calculates the number of micro seconds required to transmit a
641  * specific buffer at a specific transmit rate.
642  *
643  * @f[
644  * txtime=\frac{bufsize}{rate}10^6
645  * @f]
646  *
647  * @return Required transmit time in micro seconds.
648  */
649 int rtnl_tc_calc_txtime(int bufsize, int rate)
650 {
651  return ((double) bufsize / (double) rate) * 1000000.0;
652 }
653 
654 /**
655  * Calculate buffer size able to transmit in a specific time and rate.
656  * @arg txtime Available transmit time in micro seconds.
657  * @arg rate Transmit rate in bytes per second.
658  *
659  * Calculates the size of the buffer that can be transmitted in a
660  * specific time period at a specific transmit rate.
661  *
662  * @f[
663  * bufsize=\frac{{txtime} \times {rate}}{10^6}
664  * @f]
665  *
666  * @return Size of buffer in bytes.
667  */
668 int rtnl_tc_calc_bufsize(int txtime, int rate)
669 {
670  return ((double) txtime * (double) rate) / 1000000.0;
671 }
672 
673 /**
674  * Calculate the binary logarithm for a specific cell size
675  * @arg cell_size Size of cell, must be a power of two.
676  * @return Binary logirhtm of cell size or a negative error code.
677  */
678 int rtnl_tc_calc_cell_log(int cell_size)
679 {
680  int i;
681 
682  for (i = 0; i < 32; i++)
683  if ((1 << i) == cell_size)
684  return i;
685 
686  return -NLE_INVAL;
687 }
688 
689 
690 /** @} */
691 
692 /**
693  * @name Rate Tables
694  * @{
695  */
696 
697 /*
698  * COPYRIGHT NOTE:
699  * align_to_atm() and adjust_size() derived/coped from iproute2 source.
700  */
701 
702 /*
703  * The align to ATM cells is used for determining the (ATM) SAR
704  * alignment overhead at the ATM layer. (SAR = Segmentation And
705  * Reassembly). This is for example needed when scheduling packet on
706  * an ADSL connection. Note that the extra ATM-AAL overhead is _not_
707  * included in this calculation. This overhead is added in the kernel
708  * before doing the rate table lookup, as this gives better precision
709  * (as the table will always be aligned for 48 bytes).
710  * --Hawk, d.7/11-2004. <hawk@diku.dk>
711  */
712 static unsigned int align_to_atm(unsigned int size)
713 {
714  int linksize, cells;
715  cells = size / ATM_CELL_PAYLOAD;
716  if ((size % ATM_CELL_PAYLOAD) > 0)
717  cells++;
718 
719  linksize = cells * ATM_CELL_SIZE; /* Use full cell size to add ATM tax */
720  return linksize;
721 }
722 
723 static unsigned int adjust_size(unsigned int size, unsigned int mpu,
724  uint32_t linktype)
725 {
726  if (size < mpu)
727  size = mpu;
728 
729  switch (linktype) {
730  case ARPHRD_ATM:
731  return align_to_atm(size);
732 
733  case ARPHRD_ETHER:
734  default:
735  return size;
736  }
737 }
738 
739 /**
740  * Compute a transmission time lookup table
741  * @arg tc traffic control object
742  * @arg spec Rate specification
743  * @arg dst Destination buffer of RTNL_TC_RTABLE_SIZE uint32_t[].
744  *
745  * Computes a table of RTNL_TC_RTABLE_SIZE entries specyfing the
746  * transmission times for various packet sizes, e.g. the transmission
747  * time for a packet of size \c pktsize could be looked up:
748  * @code
749  * txtime = table[pktsize >> log2(mtu)];
750  * @endcode
751  */
752 int rtnl_tc_build_rate_table(struct rtnl_tc *tc, struct rtnl_ratespec *spec,
753  uint32_t *dst)
754 {
755  uint32_t mtu = rtnl_tc_get_mtu(tc);
756  uint32_t linktype = rtnl_tc_get_linktype(tc);
757  uint8_t cell_log = spec->rs_cell_log;
758  unsigned int size, i;
759 
760  spec->rs_mpu = rtnl_tc_get_mpu(tc);
761  spec->rs_overhead = rtnl_tc_get_overhead(tc);
762 
763  if (mtu == 0)
764  mtu = 2047;
765 
766  if (cell_log == UINT8_MAX) {
767  /*
768  * cell_log not specified, calculate it. It has to specify the
769  * minimum number of rshifts required to break the MTU to below
770  * RTNL_TC_RTABLE_SIZE.
771  */
772  cell_log = 0;
773  while ((mtu >> cell_log) >= RTNL_TC_RTABLE_SIZE)
774  cell_log++;
775  }
776 
777  for (i = 0; i < RTNL_TC_RTABLE_SIZE; i++) {
778  size = adjust_size((i + 1) << cell_log, spec->rs_mpu, linktype);
779  dst[i] = nl_us2ticks(rtnl_tc_calc_txtime64(size, spec->rs_rate64));
780  }
781 
782  spec->rs_cell_align = -1;
783  spec->rs_cell_log = cell_log;
784 
785  return 0;
786 }
787 
788 /** @} */
789 
790 /**
791  * @name TC implementation of cache functions
792  */
793 
794 void rtnl_tc_free_data(struct nl_object *obj)
795 {
796  struct rtnl_tc *tc = TC_CAST(obj);
797  struct rtnl_tc_ops *ops;
798 
799  rtnl_link_put(tc->tc_link);
800  nl_data_free(tc->tc_opts);
801  nl_data_free(tc->tc_xstats);
802 
803  if (tc->tc_subdata) {
804  ops = rtnl_tc_get_ops(tc);
805  if (ops && ops->to_free_data)
806  ops->to_free_data(tc, nl_data_get(tc->tc_subdata));
807 
808  nl_data_free(tc->tc_subdata);
809  }
810 }
811 
812 int rtnl_tc_clone(struct nl_object *dstobj, struct nl_object *srcobj)
813 {
814  struct rtnl_tc *dst = TC_CAST(dstobj);
815  struct rtnl_tc *src = TC_CAST(srcobj);
816  struct rtnl_tc_ops *ops;
817 
818  if (src->tc_link) {
819  nl_object_get(OBJ_CAST(src->tc_link));
820  dst->tc_link = src->tc_link;
821  }
822 
823  dst->tc_opts = NULL;
824  dst->tc_xstats = NULL;
825  dst->tc_subdata = NULL;
826  dst->ce_mask &= ~(TCA_ATTR_OPTS |
827  TCA_ATTR_XSTATS);
828 
829  if (src->tc_opts) {
830  dst->tc_opts = nl_data_clone(src->tc_opts);
831  if (!dst->tc_opts)
832  return -NLE_NOMEM;
833  dst->ce_mask |= TCA_ATTR_OPTS;
834  }
835 
836  if (src->tc_xstats) {
837  dst->tc_xstats = nl_data_clone(src->tc_xstats);
838  if (!dst->tc_xstats)
839  return -NLE_NOMEM;
840  dst->ce_mask |= TCA_ATTR_XSTATS;
841  }
842 
843  if (src->tc_subdata) {
844  if (!(dst->tc_subdata = nl_data_clone(src->tc_subdata))) {
845  return -NLE_NOMEM;
846  }
847  }
848 
849  ops = rtnl_tc_get_ops(src);
850  if (ops && ops->to_clone) {
851  void *a = rtnl_tc_data(dst), *b = rtnl_tc_data(src);
852 
853  if (!a)
854  return 0;
855  else if (!b)
856  return -NLE_NOMEM;
857 
858  return ops->to_clone(a, b);
859  }
860 
861  return 0;
862 }
863 
864 static int tc_dump(struct rtnl_tc *tc, enum nl_dump_type type,
865  struct nl_dump_params *p)
866 {
867  struct rtnl_tc_type_ops *type_ops;
868  struct rtnl_tc_ops *ops;
869  void *data = rtnl_tc_data(tc);
870 
871  type_ops = tc_type_ops[tc->tc_type];
872  if (type_ops && type_ops->tt_dump[type])
873  type_ops->tt_dump[type](tc, p);
874 
875  ops = rtnl_tc_get_ops(tc);
876  if (ops && ops->to_dump[type]) {
877  ops->to_dump[type](tc, data, p);
878  return 1;
879  }
880 
881  return 0;
882 }
883 
884 void rtnl_tc_dump_line(struct nl_object *obj, struct nl_dump_params *p)
885 {
886  struct rtnl_tc_type_ops *type_ops;
887  struct rtnl_tc *tc = TC_CAST(obj);
888  struct nl_cache *link_cache;
889  char buf[32];
890 
891  nl_new_line(p);
892 
893  type_ops = tc_type_ops[tc->tc_type];
894  if (type_ops && type_ops->tt_dump_prefix)
895  nl_dump(p, "%s ", type_ops->tt_dump_prefix);
896 
897  nl_dump(p, "%s ", tc->tc_kind);
898 
899  if ((link_cache = nl_cache_mngt_require_safe("route/link"))) {
900  nl_dump(p, "dev %s ",
901  rtnl_link_i2name(link_cache, tc->tc_ifindex,
902  buf, sizeof(buf)));
903  } else
904  nl_dump(p, "dev %u ", tc->tc_ifindex);
905 
906  nl_dump(p, "id %s ",
907  rtnl_tc_handle2str(tc->tc_handle, buf, sizeof(buf)));
908 
909  nl_dump(p, "parent %s",
910  rtnl_tc_handle2str(tc->tc_parent, buf, sizeof(buf)));
911 
912  tc_dump(tc, NL_DUMP_LINE, p);
913  nl_dump(p, "\n");
914 
915  if (link_cache)
916  nl_cache_put(link_cache);
917 }
918 
919 void rtnl_tc_dump_details(struct nl_object *obj, struct nl_dump_params *p)
920 {
921  struct rtnl_tc *tc = TC_CAST(obj);
922 
923  rtnl_tc_dump_line(OBJ_CAST(tc), p);
924 
925  nl_dump_line(p, " ");
926 
927  if (tc->ce_mask & TCA_ATTR_MTU)
928  nl_dump(p, " mtu %u", tc->tc_mtu);
929 
930  if (tc->ce_mask & TCA_ATTR_MPU)
931  nl_dump(p, " mpu %u", tc->tc_mpu);
932 
933  if (tc->ce_mask & TCA_ATTR_OVERHEAD)
934  nl_dump(p, " overhead %u", tc->tc_overhead);
935 
936  if (!tc_dump(tc, NL_DUMP_DETAILS, p))
937  nl_dump(p, "no options");
938  nl_dump(p, "\n");
939 }
940 
941 void rtnl_tc_dump_stats(struct nl_object *obj, struct nl_dump_params *p)
942 {
943  struct rtnl_tc *tc = TC_CAST(obj);
944  char *unit;
945  float res;
946 
947  rtnl_tc_dump_details(OBJ_CAST(tc), p);
948 
949  nl_dump_line(p,
950  " stats: %-14s %-10s %-10s %-10s %-10s %-10s\n",
951  "bytes", "packets", "drops", "overlimits", "qlen", "backlog");
952 
953  res = nl_cancel_down_bytes(tc->tc_stats[RTNL_TC_BYTES], &unit);
954 
955  nl_dump_line(p,
956  " %10.2f %3s %10u %-10u %-10u %-10u %-10u\n",
957  res, unit,
958  tc->tc_stats[RTNL_TC_PACKETS],
959  tc->tc_stats[RTNL_TC_DROPS],
960  tc->tc_stats[RTNL_TC_OVERLIMITS],
961  tc->tc_stats[RTNL_TC_QLEN],
962  tc->tc_stats[RTNL_TC_BACKLOG]);
963 
964  res = nl_cancel_down_bytes(tc->tc_stats[RTNL_TC_RATE_BPS], &unit);
965 
966  nl_dump_line(p,
967  " %10.2f %3s/s %10u/s\n",
968  res,
969  unit,
970  tc->tc_stats[RTNL_TC_RATE_PPS]);
971 }
972 
973 uint64_t rtnl_tc_compare(struct nl_object *aobj, struct nl_object *bobj,
974  uint64_t attrs, int flags)
975 {
976  struct rtnl_tc *a = TC_CAST(aobj);
977  struct rtnl_tc *b = TC_CAST(bobj);
978  uint64_t diff = 0;
979 
980 #define TC_DIFF(ATTR, EXPR) ATTR_DIFF(attrs, TCA_ATTR_##ATTR, a, b, EXPR)
981 
982  diff |= TC_DIFF(HANDLE, a->tc_handle != b->tc_handle);
983  diff |= TC_DIFF(PARENT, a->tc_parent != b->tc_parent);
984  diff |= TC_DIFF(IFINDEX, a->tc_ifindex != b->tc_ifindex);
985  diff |= TC_DIFF(KIND, strcmp(a->tc_kind, b->tc_kind));
986 
987 #undef TC_DIFF
988 
989  return diff;
990 }
991 
992 /** @} */
993 
994 /**
995  * @name Modules API
996  */
997 
998 struct rtnl_tc_ops *rtnl_tc_lookup_ops(enum rtnl_tc_type type, const char *kind)
999 {
1000  struct rtnl_tc_ops *ops;
1001 
1002  nl_list_for_each_entry(ops, &tc_ops_list[type], to_list)
1003  if (!strcmp(kind, ops->to_kind))
1004  return ops;
1005 
1006  return NULL;
1007 }
1008 
1009 struct rtnl_tc_ops *rtnl_tc_get_ops(struct rtnl_tc *tc)
1010 {
1011  if (!tc->tc_ops)
1012  tc->tc_ops = rtnl_tc_lookup_ops(tc->tc_type, tc->tc_kind);
1013 
1014  return tc->tc_ops;
1015 }
1016 
1017 /**
1018  * Register a traffic control module
1019  * @arg ops traffic control module operations
1020  */
1021 int rtnl_tc_register(struct rtnl_tc_ops *ops)
1022 {
1023  static int init = 0;
1024 
1025  /*
1026  * Initialiation hack, make sure list is initialized when
1027  * the first tc module registers. Putting this in a
1028  * separate __init would required correct ordering of init
1029  * functions
1030  */
1031  if (!init) {
1032  int i;
1033 
1034  for (i = 0; i < __RTNL_TC_TYPE_MAX; i++)
1035  nl_init_list_head(&tc_ops_list[i]);
1036 
1037  init = 1;
1038  }
1039 
1040  if (!ops->to_kind || ops->to_type > RTNL_TC_TYPE_MAX)
1041  BUG();
1042 
1043  if (rtnl_tc_lookup_ops(ops->to_type, ops->to_kind))
1044  return -NLE_EXIST;
1045 
1046  nl_list_add_tail(&ops->to_list, &tc_ops_list[ops->to_type]);
1047 
1048  return 0;
1049 }
1050 
1051 /**
1052  * Unregister a traffic control module
1053  * @arg ops traffic control module operations
1054  */
1055 void rtnl_tc_unregister(struct rtnl_tc_ops *ops)
1056 {
1057  nl_list_del(&ops->to_list);
1058 }
1059 
1060 /**
1061  * Returns the private data of the traffic control object.
1062  * Contrary to rtnl_tc_data(), this returns NULL if the data is
1063  * not yet allocated
1064  * @arg tc traffic control object
1065  *
1066  * @return pointer to the private data or NULL if not allocated.
1067  */
1068 void *rtnl_tc_data_peek(struct rtnl_tc *tc)
1069 {
1070  return tc->tc_subdata ? nl_data_get(tc->tc_subdata) : NULL;
1071 }
1072 
1073 /**
1074  * Return pointer to private data of traffic control object
1075  * @arg tc traffic control object
1076  *
1077  * Allocates the private traffic control object data section
1078  * as necessary and returns it.
1079  *
1080  * @return Pointer to private tc data or NULL if allocation failed.
1081  */
1082 void *rtnl_tc_data(struct rtnl_tc *tc)
1083 {
1084  if (!tc->tc_subdata) {
1085  size_t size;
1086 
1087  if (!tc->tc_ops) {
1088  if (!rtnl_tc_get_ops(tc))
1089  return NULL;
1090  }
1091 
1092  if (!(size = tc->tc_ops->to_size))
1093  BUG();
1094 
1095  if (!(tc->tc_subdata = nl_data_alloc(NULL, size)))
1096  return NULL;
1097  }
1098 
1099  return nl_data_get(tc->tc_subdata);
1100 }
1101 
1102 /**
1103  * Check traffic control object type and return private data section
1104  * @arg tc traffic control object
1105  * @arg ops expected traffic control object operations
1106  * @arg err the place where saves the error code if fails
1107  *
1108  * Checks whether the traffic control object matches the type
1109  * specified with the traffic control object operations. If the
1110  * type matches, the private tc object data is returned. If type
1111  * mismatches, APPBUG() will print a application bug warning.
1112  *
1113  * @see rtnl_tc_data()
1114  *
1115  * @return Pointer to private tc data or NULL if type mismatches.
1116  */
1117 void *rtnl_tc_data_check(struct rtnl_tc *tc, struct rtnl_tc_ops *ops, int *err)
1118 {
1119  void *ret;
1120 
1121  if (tc->tc_ops != ops) {
1122  char buf[64];
1123 
1124  snprintf(buf, sizeof(buf),
1125  "tc object %p used in %s context but is of type %s",
1126  tc, ops->to_kind, tc->tc_ops->to_kind);
1127  APPBUG(buf);
1128 
1129  if (err)
1130  *err = -NLE_OPNOTSUPP;
1131  return NULL;
1132  }
1133 
1134  ret = rtnl_tc_data(tc);
1135  if (ret == NULL) {
1136  if (err)
1137  *err = -NLE_NOMEM;
1138  }
1139 
1140  return ret;
1141 }
1142 
1143 struct nl_af_group tc_groups[] = {
1144  { AF_UNSPEC, RTNLGRP_TC },
1145  { END_OF_GROUP_LIST },
1146 };
1147 
1148 
1149 void rtnl_tc_type_register(struct rtnl_tc_type_ops *ops)
1150 {
1151  if (ops->tt_type > RTNL_TC_TYPE_MAX)
1152  BUG();
1153 
1154  tc_type_ops[ops->tt_type] = ops;
1155 }
1156 
1157 void rtnl_tc_type_unregister(struct rtnl_tc_type_ops *ops)
1158 {
1159  if (ops->tt_type > RTNL_TC_TYPE_MAX)
1160  BUG();
1161 
1162  tc_type_ops[ops->tt_type] = NULL;
1163 }
1164 
1165 /** @} */
1166 
1167 /** @} */
Dump object briefly on one line.
Definition: types.h:22
int rtnl_tc_register(struct rtnl_tc_ops *ops)
Register a traffic control module.
Definition: tc.c:1021
uint64_t rtnl_tc_get_stat(struct rtnl_tc *tc, enum rtnl_tc_stat id)
Return value of a statistical counter of a traffic control object.
Definition: tc.c:570
void nl_new_line(struct nl_dump_params *params)
Handle a new line while dumping.
Definition: utils.c:913
int nla_parse(struct nlattr *tb[], int maxtype, struct nlattr *head, int len, const struct nla_policy *policy)
Create attribute index based on a stream of attributes.
Definition: attr.c:243
int rtnl_tc_calc_txtime(int bufsize, int rate)
Calculate time required to transmit buffer at a specific rate.
Definition: tc.c:649
Current backlog length.
Definition: tc.h:72
void nlmsg_free(struct nl_msg *msg)
Release a reference from an netlink message.
Definition: msg.c:565
int nlmsg_parse(struct nlmsghdr *nlh, int hdrlen, struct nlattr *tb[], int maxtype, const struct nla_policy *policy)
parse attributes of a netlink message
Definition: msg.c:215
int rtnl_tc_set_kind(struct rtnl_tc *tc, const char *kind)
Define the type of traffic control object.
Definition: tc.c:530
void * nlmsg_data(const struct nlmsghdr *nlh)
Return pointer to message payload.
Definition: msg.c:107
uint32_t rtnl_tc_get_linktype(struct rtnl_tc *tc)
Return the linktype of a traffic control object.
Definition: tc.c:472
void * nl_data_get(const struct nl_data *data)
Get data buffer of abstract data object.
Definition: data.c:155
uint32_t rtnl_tc_get_overhead(struct rtnl_tc *tc)
Return per packet overhead of a traffic control object.
Definition: tc.c:441
Current bits/s (rate estimator)
Definition: tc.h:69
int rtnl_tc_calc_cell_log(int cell_size)
Calculate the binary logarithm for a specific cell size.
Definition: tc.c:678
Attribute validation policy.
Definition: attr.h:69
struct nl_cache * nl_cache_mngt_require_safe(const char *name)
Return cache previously provided via nl_cache_mngt_provide()
Definition: cache_mngt.c:431
void nl_object_get(struct nl_object *obj)
Acquire a reference on a object.
Definition: object.c:205
void rtnl_tc_set_linktype(struct rtnl_tc *tc, uint32_t type)
Set the linktype of a traffic control object.
Definition: tc.c:457
Number of packets seen.
Definition: tc.h:67
uint32_t nla_get_u32(const struct nlattr *nla)
Return payload of 32 bit integer attribute.
Definition: attr.c:707
Current packet/s (rate estimator)
Definition: tc.h:70
void rtnl_tc_set_parent(struct rtnl_tc *tc, uint32_t parent)
Set the parent identifier of a traffic control object.
Definition: tc.c:508
struct nl_data * nl_data_alloc_attr(const struct nlattr *nla)
Allocate abstract data object based on netlink attribute.
Definition: data.c:85
int nla_nest_end_keep_empty(struct nl_msg *msg, struct nlattr *start)
Finalize nesting of attributes without stripping off empty attributes.
Definition: attr.c:981
NUL terminated character string.
Definition: attr.h:45
Dump all attributes but no statistics.
Definition: types.h:23
Total bytes seen.
Definition: tc.h:68
void * rtnl_tc_data_check(struct rtnl_tc *tc, struct rtnl_tc_ops *ops, int *err)
Check traffic control object type and return private data section.
Definition: tc.c:1117
void rtnl_tc_set_link(struct rtnl_tc *tc, struct rtnl_link *link)
Set link of traffic control object.
Definition: tc.c:311
int nla_nest_end(struct nl_msg *msg, struct nlattr *start)
Finalize nesting of attributes.
Definition: attr.c:966
void rtnl_tc_unregister(struct rtnl_tc_ops *ops)
Unregister a traffic control module.
Definition: tc.c:1055
uint32_t rtnl_tc_get_handle(struct rtnl_tc *tc)
Return identifier of a traffic control object.
Definition: tc.c:497
Current queue length.
Definition: tc.h:71
nl_dump_type
Enumeration of dumping variations (dp_type)
Definition: types.h:21
Total number of overlimits.
Definition: tc.h:75
int rtnl_tc_calc_bufsize(int txtime, int rate)
Calculate buffer size able to transmit in a specific time and rate.
Definition: tc.c:668
int nla_parse_nested(struct nlattr *tb[], int maxtype, struct nlattr *nla, const struct nla_policy *policy)
Create attribute index based on nested attribute.
Definition: attr.c:1021
rtnl_tc_stat
Traffic control statistical identifier.
Definition: tc.h:66
uint32_t rtnl_tc_get_mtu(struct rtnl_tc *tc)
Return the MTU of traffic control object.
Definition: tc.c:380
double nl_cancel_down_bytes(unsigned long long l, char **unit)
Cancel down a byte counter.
Definition: utils.c:170
void rtnl_tc_set_ifindex(struct rtnl_tc *tc, int ifindex)
Set interface index of traffic control object.
Definition: tc.c:279
#define TC_CAST(ptr)
Macro to cast qdisc/class/classifier to tc object.
Definition: tc.h:56
uint32_t rtnl_tc_get_parent(struct rtnl_tc *tc)
Return parent identifier of a traffic control object.
Definition: tc.c:518
void * nla_data(const struct nlattr *nla)
Return pointer to the payload section.
Definition: attr.c:121
#define NLA_PUT_U32(msg, attrtype, value)
Add 32 bit integer attribute to netlink message.
Definition: attr.h:236
void rtnl_tc_set_handle(struct rtnl_tc *tc, uint32_t id)
Set identifier of traffic control object.
Definition: tc.c:487
struct nl_data * nl_data_clone(const struct nl_data *src)
Clone an abstract data object.
Definition: data.c:96
uint16_t minlen
Minimal length of payload required.
Definition: attr.h:74
void * rtnl_tc_data(struct rtnl_tc *tc)
Return pointer to private data of traffic control object.
Definition: tc.c:1082
void rtnl_tc_set_mpu(struct rtnl_tc *tc, uint32_t mpu)
Set the Minimum Packet Unit (MPU) of a traffic control object.
Definition: tc.c:400
int nlmsg_append(struct nl_msg *n, void *data, size_t len, int pad)
Append data to tail of a netlink message.
Definition: msg.c:449
struct nl_data * nl_data_alloc(const void *buf, size_t size)
Allocate a new abstract data object.
Definition: data.c:51
#define NLA_PUT_STRING(msg, attrtype, value)
Add string attribute to netlink message.
Definition: attr.h:263
Nested attributes.
Definition: attr.h:48
void rtnl_tc_set_chain(struct rtnl_tc *tc, uint32_t chain)
Set the chain index of a traffic control object.
Definition: tc.c:584
uint16_t type
Type of attribute or NLA_UNSPEC.
Definition: attr.h:71
struct nl_msg * nlmsg_alloc_simple(int nlmsgtype, int flags)
Allocate a new netlink message.
Definition: msg.c:348
void rtnl_tc_set_mtu(struct rtnl_tc *tc, uint32_t mtu)
Set the Maximum Transmission Unit (MTU) of traffic control object.
Definition: tc.c:365
32 bit integer
Definition: attr.h:43
uint32_t nl_us2ticks(uint32_t us)
Convert micro seconds to ticks.
Definition: utils.c:529
char * rtnl_tc_handle2str(uint32_t handle, char *buf, size_t len)
Convert a traffic control handle to a character string (Reentrant).
Definition: classid.c:110
int rtnl_tc_build_rate_table(struct rtnl_tc *tc, struct rtnl_ratespec *spec, uint32_t *dst)
Compute a transmission time lookup table.
Definition: tc.c:752
Dumping parameters.
Definition: types.h:33
char * rtnl_tc_get_kind(struct rtnl_tc *tc)
Return kind of traffic control object.
Definition: tc.c:555
Total number of requeues.
Definition: tc.h:74
void rtnl_tc_set_overhead(struct rtnl_tc *tc, uint32_t overhead)
Set per packet overhead of a traffic control object.
Definition: tc.c:429
uint32_t rtnl_tc_get_mpu(struct rtnl_tc *tc)
Return the Minimum Packet Unit (MPU) of a traffic control object.
Definition: tc.c:412
struct rtnl_link * rtnl_tc_get_link(struct rtnl_tc *tc)
Get link of traffic control object.
Definition: tc.c:342
int rtnl_tc_get_chain(struct rtnl_tc *tc, uint32_t *out_value)
Return chain index of traffic control object.
Definition: tc.c:598
void nl_dump(struct nl_dump_params *params, const char *fmt,...)
Dump a formatted character string.
Definition: utils.c:962
void * rtnl_tc_data_peek(struct rtnl_tc *tc)
Returns the private data of the traffic control object.
Definition: tc.c:1068
int rtnl_tc_get_ifindex(struct rtnl_tc *tc)
Return interface index of traffic control object.
Definition: tc.c:294
Total number of packets dropped.
Definition: tc.h:73
size_t nla_strlcpy(char *dst, const struct nlattr *nla, size_t dstsize)
Copy string attribute payload to a buffer.
Definition: attr.c:379
struct nlattr * nla_nest_start(struct nl_msg *msg, int attrtype)
Start a new level of nested attributes.
Definition: attr.c:903
void nl_data_free(struct nl_data *data)
Free an abstract data object.
Definition: data.c:135