summaryrefslogtreecommitdiffstats
path: root/src/network/tc/tclass.c
blob: 0452cc99a87ec5ea59d6e0372f4f6d4f9f22b4c5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
/* SPDX-License-Identifier: LGPL-2.1-or-later
 * Copyright © 2019 VMware, Inc. */

#include <linux/pkt_sched.h>

#include "alloc-util.h"
#include "conf-parser.h"
#include "in-addr-util.h"
#include "netlink-util.h"
#include "networkd-link.h"
#include "networkd-manager.h"
#include "networkd-network.h"
#include "networkd-queue.h"
#include "parse-util.h"
#include "set.h"
#include "string-util.h"
#include "strv.h"
#include "tc-util.h"
#include "tclass.h"

const TClassVTable * const tclass_vtable[_TCLASS_KIND_MAX] = {
        [TCLASS_KIND_DRR] = &drr_tclass_vtable,
        [TCLASS_KIND_HTB] = &htb_tclass_vtable,
        [TCLASS_KIND_QFQ] = &qfq_tclass_vtable,
};

static int tclass_new(TClassKind kind, TClass **ret) {
        _cleanup_(tclass_freep) TClass *tclass = NULL;
        int r;

        if (kind == _TCLASS_KIND_INVALID) {
                tclass = new(TClass, 1);
                if (!tclass)
                        return -ENOMEM;

                *tclass = (TClass) {
                        .parent = TC_H_ROOT,
                        .kind = kind,
                };
        } else {
                assert(kind >= 0 && kind < _TCLASS_KIND_MAX);
                tclass = malloc0(tclass_vtable[kind]->object_size);
                if (!tclass)
                        return -ENOMEM;

                tclass->parent = TC_H_ROOT;
                tclass->kind = kind;

                if (TCLASS_VTABLE(tclass)->init) {
                        r = TCLASS_VTABLE(tclass)->init(tclass);
                        if (r < 0)
                                return r;
                }
        }

        *ret = TAKE_PTR(tclass);

        return 0;
}

int tclass_new_static(TClassKind kind, Network *network, const char *filename, unsigned section_line, TClass **ret) {
        _cleanup_(config_section_freep) ConfigSection *n = NULL;
        _cleanup_(tclass_freep) TClass *tclass = NULL;
        TClass *existing;
        int r;

        assert(network);
        assert(ret);
        assert(filename);
        assert(section_line > 0);

        r = config_section_new(filename, section_line, &n);
        if (r < 0)
                return r;

        existing = hashmap_get(network->tclasses_by_section, n);
        if (existing) {
                if (existing->kind != kind)
                        return -EINVAL;

                *ret = existing;
                return 0;
        }

        r = tclass_new(kind, &tclass);
        if (r < 0)
                return r;

        tclass->network = network;
        tclass->section = TAKE_PTR(n);
        tclass->source = NETWORK_CONFIG_SOURCE_STATIC;

        r = hashmap_ensure_put(&network->tclasses_by_section, &config_section_hash_ops, tclass->section, tclass);
        if (r < 0)
                return r;

        *ret = TAKE_PTR(tclass);
        return 0;
}

TClass* tclass_free(TClass *tclass) {
        if (!tclass)
                return NULL;

        if (tclass->network && tclass->section)
                hashmap_remove(tclass->network->tclasses_by_section, tclass->section);

        config_section_free(tclass->section);

        if (tclass->link)
                set_remove(tclass->link->tclasses, tclass);

        free(tclass->tca_kind);
        return mfree(tclass);
}

static const char *tclass_get_tca_kind(const TClass *tclass) {
        assert(tclass);

        return (TCLASS_VTABLE(tclass) && TCLASS_VTABLE(tclass)->tca_kind) ?
                TCLASS_VTABLE(tclass)->tca_kind : tclass->tca_kind;
}

static void tclass_hash_func(const TClass *tclass, struct siphash *state) {
        assert(tclass);
        assert(state);

        siphash24_compress(&tclass->classid, sizeof(tclass->classid), state);
        siphash24_compress(&tclass->parent, sizeof(tclass->parent), state);
        siphash24_compress_string(tclass_get_tca_kind(tclass), state);
}

static int tclass_compare_func(const TClass *a, const TClass *b) {
        int r;

        assert(a);
        assert(b);

        r = CMP(a->classid, b->classid);
        if (r != 0)
                return r;

        r = CMP(a->parent, b->parent);
        if (r != 0)
                return r;

        return strcmp_ptr(tclass_get_tca_kind(a), tclass_get_tca_kind(b));
}

DEFINE_PRIVATE_HASH_OPS_WITH_KEY_DESTRUCTOR(
        tclass_hash_ops,
        TClass,
        tclass_hash_func,
        tclass_compare_func,
        tclass_free);

static int tclass_get(Link *link, const TClass *in, TClass **ret) {
        TClass *existing;

        assert(link);
        assert(in);

        existing = set_get(link->tclasses, in);
        if (!existing)
                return -ENOENT;

        if (ret)
                *ret = existing;
        return 0;
}

static int tclass_add(Link *link, TClass *tclass) {
        int r;

        assert(link);
        assert(tclass);

        r = set_ensure_put(&link->tclasses, &tclass_hash_ops, tclass);
        if (r < 0)
                return r;
        if (r == 0)
                return -EEXIST;

        tclass->link = link;
        return 0;
}

static int tclass_dup(const TClass *src, TClass **ret) {
        _cleanup_(tclass_freep) TClass *dst = NULL;

        assert(src);
        assert(ret);

        if (TCLASS_VTABLE(src))
                dst = memdup(src, TCLASS_VTABLE(src)->object_size);
        else
                dst = newdup(TClass, src, 1);
        if (!dst)
                return -ENOMEM;

        /* clear all pointers */
        dst->network = NULL;
        dst->section = NULL;
        dst->link = NULL;
        dst->tca_kind = NULL;

        if (src->tca_kind) {
                dst->tca_kind = strdup(src->tca_kind);
                if (!dst->tca_kind)
                        return -ENOMEM;
        }

        *ret = TAKE_PTR(dst);
        return 0;
}

int link_find_tclass(Link *link, uint32_t classid, TClass **ret) {
        TClass *tclass;

        assert(link);

        SET_FOREACH(tclass, link->tclasses) {
                if (tclass->classid != classid)
                        continue;

                if (tclass->source == NETWORK_CONFIG_SOURCE_FOREIGN)
                        continue;

                if (!tclass_exists(tclass))
                        continue;

                if (ret)
                        *ret = tclass;
                return 0;
        }

        return -ENOENT;
}

static void log_tclass_debug(TClass *tclass, Link *link, const char *str) {
        _cleanup_free_ char *state = NULL;

        assert(tclass);
        assert(str);

        if (!DEBUG_LOGGING)
                return;

        (void) network_config_state_to_string_alloc(tclass->state, &state);

        log_link_debug(link, "%s %s TClass (%s): classid=%"PRIx32":%"PRIx32", parent=%"PRIx32":%"PRIx32", kind=%s",
                       str, strna(network_config_source_to_string(tclass->source)), strna(state),
                       TC_H_MAJ(tclass->classid) >> 16, TC_H_MIN(tclass->classid),
                       TC_H_MAJ(tclass->parent) >> 16, TC_H_MIN(tclass->parent),
                       strna(tclass_get_tca_kind(tclass)));
}

static int tclass_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, TClass *tclass) {
        int r;

        assert(m);
        assert(link);

        r = sd_netlink_message_get_errno(m);
        if (r < 0 && r != -EEXIST) {
                log_link_message_error_errno(link, m, r, "Could not set TClass");
                link_enter_failed(link);
                return 1;
        }

        if (link->tc_messages == 0) {
                log_link_debug(link, "Traffic control configured");
                link->tc_configured = true;
                link_check_ready(link);
        }

        return 1;
}

static int tclass_configure(TClass *tclass, Link *link, Request *req) {
        _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
        int r;

        assert(tclass);
        assert(link);
        assert(link->manager);
        assert(link->manager->rtnl);
        assert(link->ifindex > 0);
        assert(req);

        log_tclass_debug(tclass, link, "Configuring");

        r = sd_rtnl_message_new_traffic_control(link->manager->rtnl, &m, RTM_NEWTCLASS,
                                                link->ifindex, tclass->classid, tclass->parent);
        if (r < 0)
                return r;

        r = sd_netlink_message_append_string(m, TCA_KIND, TCLASS_VTABLE(tclass)->tca_kind);
        if (r < 0)
                return r;

        if (TCLASS_VTABLE(tclass)->fill_message) {
                r = TCLASS_VTABLE(tclass)->fill_message(link, tclass, m);
                if (r < 0)
                        return r;
        }

        return request_call_netlink_async(link->manager->rtnl, m, req);
}

static bool tclass_is_ready_to_configure(TClass *tclass, Link *link) {
        assert(tclass);
        assert(link);

        if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED))
                return false;

        return link_find_qdisc(link, tclass->classid, tclass->parent, tclass_get_tca_kind(tclass), NULL) >= 0;
}

static int tclass_process_request(Request *req, Link *link, TClass *tclass) {
        int r;

        assert(req);
        assert(link);
        assert(tclass);

        if (!tclass_is_ready_to_configure(tclass, link))
                return 0;

        r = tclass_configure(tclass, link, req);
        if (r < 0)
                return log_link_warning_errno(link, r, "Failed to configure TClass: %m");

        tclass_enter_configuring(tclass);
        return 1;
}

int link_request_tclass(Link *link, TClass *tclass) {
        TClass *existing;
        int r;

        assert(link);
        assert(tclass);

        if (tclass_get(link, tclass, &existing) < 0) {
                _cleanup_(tclass_freep) TClass *tmp = NULL;

                r = tclass_dup(tclass, &tmp);
                if (r < 0)
                        return log_oom();

                r = tclass_add(link, tmp);
                if (r < 0)
                        return log_link_warning_errno(link, r, "Failed to store TClass: %m");

                existing = TAKE_PTR(tmp);
        } else
                existing->source = tclass->source;

        log_tclass_debug(existing, link, "Requesting");
        r = link_queue_request_safe(link, REQUEST_TYPE_TC_CLASS,
                                    existing, NULL,
                                    tclass_hash_func,
                                    tclass_compare_func,
                                    tclass_process_request,
                                    &link->tc_messages,
                                    tclass_handler,
                                    NULL);
        if (r < 0)
                return log_link_warning_errno(link, r, "Failed to request TClass: %m");
        if (r == 0)
                return 0;

        tclass_enter_requesting(existing);
        return 1;
}

int manager_rtnl_process_tclass(sd_netlink *rtnl, sd_netlink_message *message, Manager *m) {
        _cleanup_(tclass_freep) TClass *tmp = NULL;
        TClass *tclass = NULL;
        Link *link;
        uint16_t type;
        int ifindex, r;

        assert(rtnl);
        assert(message);
        assert(m);

        if (sd_netlink_message_is_error(message)) {
                r = sd_netlink_message_get_errno(message);
                if (r < 0)
                        log_message_warning_errno(message, r, "rtnl: failed to receive TClass message, ignoring");

                return 0;
        }

        r = sd_netlink_message_get_type(message, &type);
        if (r < 0) {
                log_warning_errno(r, "rtnl: could not get message type, ignoring: %m");
                return 0;
        } else if (!IN_SET(type, RTM_NEWTCLASS, RTM_DELTCLASS)) {
                log_warning("rtnl: received unexpected message type %u when processing TClass, ignoring.", type);
                return 0;
        }

        r = sd_rtnl_message_traffic_control_get_ifindex(message, &ifindex);
        if (r < 0) {
                log_warning_errno(r, "rtnl: could not get ifindex from message, ignoring: %m");
                return 0;
        } else if (ifindex <= 0) {
                log_warning("rtnl: received TClass message with invalid ifindex %d, ignoring.", ifindex);
                return 0;
        }

        if (link_get_by_index(m, ifindex, &link) < 0) {
                if (!m->enumerating)
                        log_warning("rtnl: received TClass for link '%d' we don't know about, ignoring.", ifindex);
                return 0;
        }

        r = tclass_new(_TCLASS_KIND_INVALID, &tmp);
        if (r < 0)
                return log_oom();

        r = sd_rtnl_message_traffic_control_get_handle(message, &tmp->classid);
        if (r < 0) {
                log_link_warning_errno(link, r, "rtnl: received TClass message without handle, ignoring: %m");
                return 0;
        }

        r = sd_rtnl_message_traffic_control_get_parent(message, &tmp->parent);
        if (r < 0) {
                log_link_warning_errno(link, r, "rtnl: received TClass message without parent, ignoring: %m");
                return 0;
        }

        r = sd_netlink_message_read_string_strdup(message, TCA_KIND, &tmp->tca_kind);
        if (r < 0) {
                log_link_warning_errno(link, r, "rtnl: received TClass message without kind, ignoring: %m");
                return 0;
        }

        (void) tclass_get(link, tmp, &tclass);

        switch (type) {
        case RTM_NEWTCLASS:
                if (tclass) {
                        tclass_enter_configured(tclass);
                        log_tclass_debug(tclass, link, "Received remembered");
                } else {
                        tclass_enter_configured(tmp);
                        log_tclass_debug(tmp, link, "Received new");

                        r = tclass_add(link, tmp);
                        if (r < 0) {
                                log_link_warning_errno(link, r, "Failed to remember TClass, ignoring: %m");
                                return 0;
                        }

                        tclass = TAKE_PTR(tmp);
                }

                break;

        case RTM_DELTCLASS:
                if (tclass) {
                        tclass_enter_removed(tclass);
                        if (tclass->state == 0) {
                                log_tclass_debug(tclass, link, "Forgetting");
                                tclass_free(tclass);
                        } else
                                log_tclass_debug(tclass, link, "Removed");
                } else
                        log_tclass_debug(tmp, link, "Kernel removed unknown");

                break;

        default:
                assert_not_reached();
        }

        return 1;
}

static int tclass_section_verify(TClass *tclass) {
        int r;

        assert(tclass);

        if (section_is_invalid(tclass->section))
                return -EINVAL;

        if (TCLASS_VTABLE(tclass)->verify) {
                r = TCLASS_VTABLE(tclass)->verify(tclass);
                if (r < 0)
                        return r;
        }

        return 0;
}

void network_drop_invalid_tclass(Network *network) {
        TClass *tclass;

        assert(network);

        HASHMAP_FOREACH(tclass, network->tclasses_by_section)
                if (tclass_section_verify(tclass) < 0)
                        tclass_free(tclass);
}

int config_parse_tclass_parent(
                const char *unit,
                const char *filename,
                unsigned line,
                const char *section,
                unsigned section_line,
                const char *lvalue,
                int ltype,
                const char *rvalue,
                void *data,
                void *userdata) {

        _cleanup_(tclass_free_or_set_invalidp) TClass *tclass = NULL;
        Network *network = ASSERT_PTR(data);
        int r;

        assert(filename);
        assert(lvalue);
        assert(rvalue);

        r = tclass_new_static(ltype, network, filename, section_line, &tclass);
        if (r == -ENOMEM)
                return log_oom();
        if (r < 0) {
                log_syntax(unit, LOG_WARNING, filename, line, r,
                           "Failed to create traffic control class, ignoring assignment: %m");
                return 0;
        }

        if (streq(rvalue, "root"))
                tclass->parent = TC_H_ROOT;
        else {
                r = parse_handle(rvalue, &tclass->parent);
                if (r < 0) {
                        log_syntax(unit, LOG_WARNING, filename, line, r,
                                   "Failed to parse 'Parent=', ignoring assignment: %s",
                                   rvalue);
                        return 0;
                }
        }

        TAKE_PTR(tclass);

        return 0;
}

int config_parse_tclass_classid(
                const char *unit,
                const char *filename,
                unsigned line,
                const char *section,
                unsigned section_line,
                const char *lvalue,
                int ltype,
                const char *rvalue,
                void *data,
                void *userdata) {

        _cleanup_(tclass_free_or_set_invalidp) TClass *tclass = NULL;
        Network *network = ASSERT_PTR(data);
        int r;

        assert(filename);
        assert(lvalue);
        assert(rvalue);

        r = tclass_new_static(ltype, network, filename, section_line, &tclass);
        if (r == -ENOMEM)
                return log_oom();
        if (r < 0) {
                log_syntax(unit, LOG_WARNING, filename, line, r,
                           "Failed to create traffic control class, ignoring assignment: %m");
                return 0;
        }

        if (isempty(rvalue)) {
                tclass->classid = TC_H_UNSPEC;
                TAKE_PTR(tclass);
                return 0;
        }

        r = parse_handle(rvalue, &tclass->classid);
        if (r < 0) {
                log_syntax(unit, LOG_WARNING, filename, line, r,
                           "Failed to parse 'ClassId=', ignoring assignment: %s",
                           rvalue);
                return 0;
        }

        TAKE_PTR(tclass);

        return 0;
}