src/network/tc/qdisc.c

   1 /* SPDX-License-Identifier: LGPL-2.1+
   2  * Copyright © 2019 VMware, Inc. */
   3
   4 #include <linux/pkt_sched.h>
   5
   6 #include "alloc-util.h"
   7 #include "conf-parser.h"
   8 #include "in-addr-util.h"
   9 #include "netlink-util.h"
  10 #include "networkd-manager.h"
  11 #include "parse-util.h"
  12 #include "qdisc.h"
  13 #include "set.h"
  14 #include "string-util.h"
  15 #include "strv.h"
  16 #include "tc-util.h"
  17
  18 const QDiscVTable * const qdisc_vtable[_QDISC_KIND_MAX] = {
  19         [QDISC_KIND_BFIFO] = &bfifo_vtable,
  20         [QDISC_KIND_CAKE] = &cake_vtable,
  21         [QDISC_KIND_CODEL] = &codel_vtable,
  22         [QDISC_KIND_DRR] = &drr_vtable,
  23         [QDISC_KIND_ETS] = &ets_vtable,
  24         [QDISC_KIND_FQ] = &fq_vtable,
  25         [QDISC_KIND_FQ_CODEL] = &fq_codel_vtable,
  26         [QDISC_KIND_GRED] = &gred_vtable,
  27         [QDISC_KIND_HHF] = &hhf_vtable,
  28         [QDISC_KIND_HTB] = &htb_vtable,
  29         [QDISC_KIND_NETEM] = &netem_vtable,
  30         [QDISC_KIND_PIE] = &pie_vtable,
  31         [QDISC_KIND_QFQ] = &qfq_vtable,
  32         [QDISC_KIND_PFIFO] = &pfifo_vtable,
  33         [QDISC_KIND_PFIFO_FAST] = &pfifo_fast_vtable,
  34         [QDISC_KIND_PFIFO_HEAD_DROP] = &pfifo_head_drop_vtable,
  35         [QDISC_KIND_SFB] = &sfb_vtable,
  36         [QDISC_KIND_SFQ] = &sfq_vtable,
  37         [QDISC_KIND_TBF] = &tbf_vtable,
  38         [QDISC_KIND_TEQL] = &teql_vtable,
  39 };
  40
  41 static int qdisc_new(QDiscKind kind, QDisc **ret) {
  42         _cleanup_(qdisc_freep) QDisc *qdisc = NULL;
  43         int r;
  44
  45         if (kind == _QDISC_KIND_INVALID) {
  46                 qdisc = new(QDisc, 1);
  47                 if (!qdisc)
  48                         return -ENOMEM;
  49
  50                 *qdisc = (QDisc) {
  51                         .meta.kind = TC_KIND_QDISC,
  52                         .family = AF_UNSPEC,
  53                         .parent = TC_H_ROOT,
  54                         .kind = kind,
  55                 };
  56         } else {
  57                 qdisc = malloc0(qdisc_vtable[kind]->object_size);
  58                 if (!qdisc)
  59                         return -ENOMEM;
  60
  61                 qdisc->meta.kind = TC_KIND_QDISC,
  62                 qdisc->family = AF_UNSPEC;
  63                 qdisc->parent = TC_H_ROOT;
  64                 qdisc->kind = kind;
  65
  66                 if (QDISC_VTABLE(qdisc)->init) {
  67                         r = QDISC_VTABLE(qdisc)->init(qdisc);
  68                         if (r < 0)
  69                                 return r;
  70                 }
  71         }
  72
  73         *ret = TAKE_PTR(qdisc);
  74
  75         return 0;
  76 }
  77
  78 int qdisc_new_static(QDiscKind kind, Network *network, const char *filename, unsigned section_line, QDisc **ret) {
  79         _cleanup_(network_config_section_freep) NetworkConfigSection *n = NULL;
  80         _cleanup_(qdisc_freep) QDisc *qdisc = NULL;
  81         TrafficControl *existing;
  82         QDisc *q = NULL;
  83         int r;
  84
  85         assert(network);
  86         assert(ret);
  87         assert(filename);
  88         assert(section_line > 0);
  89
  90         r = network_config_section_new(filename, section_line, &n);
  91         if (r < 0)
  92                 return r;
  93
  94         existing = ordered_hashmap_get(network->tc_by_section, n);
  95         if (existing) {
  96                 if (existing->kind != TC_KIND_QDISC)
  97                         return -EINVAL;
  98
  99                 q = TC_TO_QDISC(existing);
 100
 101                 if (q->kind != _QDISC_KIND_INVALID &&
 102                     kind != _QDISC_KIND_INVALID &&
 103                     q->kind != kind)
 104                         return -EINVAL;
 105
 106                 if (q->kind == kind || kind == _QDISC_KIND_INVALID) {
 107                         *ret = q;
 108                         return 0;
 109                 }
 110         }
 111
 112         r = qdisc_new(kind, &qdisc);
 113         if (r < 0)
 114                 return r;
 115
 116         if (q) {
 117                 qdisc->family = q->family;
 118                 qdisc->handle = q->handle;
 119                 qdisc->parent = q->parent;
 120                 qdisc->tca_kind = TAKE_PTR(q->tca_kind);
 121
 122                 qdisc_free(q);
 123         }
 124
 125         qdisc->network = network;
 126         qdisc->section = TAKE_PTR(n);
 127
 128         r = ordered_hashmap_ensure_allocated(&network->tc_by_section, &network_config_hash_ops);
 129         if (r < 0)
 130                 return r;
 131
 132         r = ordered_hashmap_put(network->tc_by_section, qdisc->section, TC(qdisc));
 133         if (r < 0)
 134                 return r;
 135
 136         *ret = TAKE_PTR(qdisc);
 137         return 0;
 138 }
 139
 140 void qdisc_free(QDisc *qdisc) {
 141         if (!qdisc)
 142                 return;
 143
 144         if (qdisc->network && qdisc->section)
 145                 ordered_hashmap_remove(qdisc->network->tc_by_section, qdisc->section);
 146
 147         network_config_section_free(qdisc->section);
 148
 149         free(qdisc->tca_kind);
 150         free(qdisc);
 151 }
 152
 153 static int qdisc_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
 154         int r;
 155
 156         assert(link);
 157         assert(link->tc_messages > 0);
 158         link->tc_messages--;
 159
 160         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 161                 return 1;
 162
 163         r = sd_netlink_message_get_errno(m);
 164         if (r < 0 && r != -EEXIST) {
 165                 log_link_message_error_errno(link, m, r, "Could not set QDisc");
 166                 link_enter_failed(link);
 167                 return 1;
 168         }
 169
 170         if (link->tc_messages == 0) {
 171                 log_link_debug(link, "Traffic control configured");
 172                 link->tc_configured = true;
 173                 link_check_ready(link);
 174         }
 175
 176         return 1;
 177 }
 178
 179 int qdisc_configure(Link *link, QDisc *qdisc) {
 180         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
 181         int r;
 182
 183         assert(link);
 184         assert(link->manager);
 185         assert(link->manager->rtnl);
 186         assert(link->ifindex > 0);
 187
 188         r = sd_rtnl_message_new_qdisc(link->manager->rtnl, &req, RTM_NEWQDISC, qdisc->family, link->ifindex);
 189         if (r < 0)
 190                 return log_link_error_errno(link, r, "Could not create RTM_NEWQDISC message: %m");
 191
 192         r = sd_rtnl_message_set_qdisc_parent(req, qdisc->parent);
 193         if (r < 0)
 194                 return log_link_error_errno(link, r, "Could not create tcm_parent message: %m");
 195
 196         if (qdisc->handle != TC_H_UNSPEC) {
 197                 r = sd_rtnl_message_set_qdisc_handle(req, qdisc->handle);
 198                 if (r < 0)
 199                         return log_link_error_errno(link, r, "Could not set tcm_handle message: %m");
 200         }
 201
 202         if (QDISC_VTABLE(qdisc)) {
 203                 if (QDISC_VTABLE(qdisc)->fill_tca_kind) {
 204                         r = QDISC_VTABLE(qdisc)->fill_tca_kind(link, qdisc, req);
 205                         if (r < 0)
 206                                 return r;
 207                 } else {
 208                         r = sd_netlink_message_append_string(req, TCA_KIND, QDISC_VTABLE(qdisc)->tca_kind);
 209                         if (r < 0)
 210                                 return log_link_error_errno(link, r, "Could not append TCA_KIND attribute: %m");
 211                 }
 212
 213                 if (QDISC_VTABLE(qdisc)->fill_message) {
 214                         r = QDISC_VTABLE(qdisc)->fill_message(link, qdisc, req);
 215                         if (r < 0)
 216                                 return r;
 217                 }
 218         } else {
 219                 r = sd_netlink_message_append_string(req, TCA_KIND, qdisc->tca_kind);
 220                 if (r < 0)
 221                         return log_link_error_errno(link, r, "Could not append TCA_KIND attribute: %m");
 222         }
 223
 224         r = netlink_call_async(link->manager->rtnl, NULL, req, qdisc_handler, link_netlink_destroy_callback, link);
 225         if (r < 0)
 226                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
 227
 228         link_ref(link);
 229         link->tc_messages++;
 230
 231         return 0;
 232 }
 233
 234 int qdisc_section_verify(QDisc *qdisc, bool *has_root, bool *has_clsact) {
 235         int r;
 236
 237         assert(qdisc);
 238         assert(has_root);
 239         assert(has_clsact);
 240
 241         if (section_is_invalid(qdisc->section))
 242                 return -EINVAL;
 243
 244         if (QDISC_VTABLE(qdisc) && QDISC_VTABLE(qdisc)->verify) {
 245                 r = QDISC_VTABLE(qdisc)->verify(qdisc);
 246                 if (r < 0)
 247                         return r;
 248         }
 249
 250         if (qdisc->parent == TC_H_ROOT) {
 251                 if (*has_root)
 252                         return log_warning_errno(SYNTHETIC_ERRNO(EINVAL),
 253                                                  "%s: More than one root qdisc section is defined. "
 254                                                  "Ignoring the qdisc section from line %u.",
 255                                                  qdisc->section->filename, qdisc->section->line);
 256                 *has_root = true;
 257         } else if (qdisc->parent == TC_H_CLSACT) { /* TC_H_CLSACT == TC_H_INGRESS */
 258                 if (*has_clsact)
 259                         return log_warning_errno(SYNTHETIC_ERRNO(EINVAL),
 260                                                  "%s: More than one clsact or ingress qdisc section is defined. "
 261                                                  "Ignoring the qdisc section from line %u.",
 262                                                  qdisc->section->filename, qdisc->section->line);
 263                 *has_clsact = true;
 264         }
 265
 266         return 0;
 267 }
 268
 269 int config_parse_qdisc_parent(
 270                 const char *unit,
 271                 const char *filename,
 272                 unsigned line,
 273                 const char *section,
 274                 unsigned section_line,
 275                 const char *lvalue,
 276                 int ltype,
 277                 const char *rvalue,
 278                 void *data,
 279                 void *userdata) {
 280
 281         _cleanup_(qdisc_free_or_set_invalidp) QDisc *qdisc = NULL;
 282         Network *network = data;
 283         int r;
 284
 285         assert(filename);
 286         assert(lvalue);
 287         assert(rvalue);
 288         assert(data);
 289
 290         r = qdisc_new_static(ltype, network, filename, section_line, &qdisc);
 291         if (r < 0)
 292                 return r;
 293
 294         if (streq(rvalue, "root")) {
 295                 qdisc->parent = TC_H_ROOT;
 296                 if (qdisc->handle == 0)
 297                         qdisc->handle = TC_H_UNSPEC;
 298         } else if (streq(rvalue, "clsact")) {
 299                 qdisc->parent = TC_H_CLSACT;
 300                 qdisc->handle = TC_H_MAKE(TC_H_CLSACT, 0);
 301         } else if (streq(rvalue, "ingress")) {
 302                 qdisc->parent = TC_H_INGRESS;
 303                 qdisc->handle = TC_H_MAKE(TC_H_INGRESS, 0);
 304         } else {
 305                 r = parse_handle(rvalue, &qdisc->parent);
 306                 if (r < 0) {
 307                         log_syntax(unit, LOG_ERR, filename, line, r,
 308                                    "Failed to parse 'Parent=', ignoring assignment: %s",
 309                                    rvalue);
 310                         return 0;
 311                 }
 312         }
 313
 314         if (STR_IN_SET(rvalue, "clsact", "ingress")) {
 315                 r = free_and_strdup(&qdisc->tca_kind, rvalue);
 316                 if (r < 0)
 317                         return log_oom();
 318         } else
 319                 qdisc->tca_kind = mfree(qdisc->tca_kind);
 320
 321         qdisc = NULL;
 322
 323         return 0;
 324 }
 325
 326 int config_parse_qdisc_handle(
 327                 const char *unit,
 328                 const char *filename,
 329                 unsigned line,
 330                 const char *section,
 331                 unsigned section_line,
 332                 const char *lvalue,
 333                 int ltype,
 334                 const char *rvalue,
 335                 void *data,
 336                 void *userdata) {
 337
 338         _cleanup_(qdisc_free_or_set_invalidp) QDisc *qdisc = NULL;
 339         Network *network = data;
 340         uint16_t n;
 341         int r;
 342
 343         assert(filename);
 344         assert(lvalue);
 345         assert(rvalue);
 346         assert(data);
 347
 348         r = qdisc_new_static(ltype, network, filename, section_line, &qdisc);
 349         if (r < 0)
 350                 return r;
 351
 352         if (isempty(rvalue)) {
 353                 qdisc->handle = TC_H_UNSPEC;
 354                 qdisc = NULL;
 355                 return 0;
 356         }
 357
 358         r = safe_atou16_full(rvalue, 16, &n);
 359         if (r < 0) {
 360                 log_syntax(unit, LOG_ERR, filename, line, r,
 361                            "Failed to parse 'Handle=', ignoring assignment: %s",
 362                            rvalue);
 363                 return 0;
 364         }
 365
 366         qdisc->handle = (uint32_t) n << 16;
 367         qdisc = NULL;
 368
 369         return 0;
 370 }