src/network/networkd-fdb.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   Copyright © 2014 Intel Corporation. All rights reserved.
   4 ***/
   5
   6 #include <net/ethernet.h>
   7 #include <net/if.h>
   8
   9 #include "alloc-util.h"
  10 #include "bridge.h"
  11 #include "conf-parser.h"
  12 #include "netlink-util.h"
  13 #include "networkd-fdb.h"
  14 #include "networkd-manager.h"
  15 #include "parse-util.h"
  16 #include "string-util.h"
  17 #include "string-table.h"
  18 #include "util.h"
  19 #include "vlan-util.h"
  20 #include "vxlan.h"
  21
  22 #define STATIC_FDB_ENTRIES_PER_NETWORK_MAX 1024U
  23
  24 static const char* const fdb_ntf_flags_table[_NEIGHBOR_CACHE_ENTRY_FLAGS_MAX] = {
  25         [NEIGHBOR_CACHE_ENTRY_FLAGS_USE] = "use",
  26         [NEIGHBOR_CACHE_ENTRY_FLAGS_SELF] = "self",
  27         [NEIGHBOR_CACHE_ENTRY_FLAGS_MASTER] = "master",
  28         [NEIGHBOR_CACHE_ENTRY_FLAGS_ROUTER] = "router",
  29 };
  30
  31 DEFINE_STRING_TABLE_LOOKUP(fdb_ntf_flags, NeighborCacheEntryFlags);
  32
  33 /* remove and FDB entry. */
  34 FdbEntry *fdb_entry_free(FdbEntry *fdb_entry) {
  35         if (!fdb_entry)
  36                 return NULL;
  37
  38         if (fdb_entry->network) {
  39                 LIST_REMOVE(static_fdb_entries, fdb_entry->network->static_fdb_entries, fdb_entry);
  40                 assert(fdb_entry->network->n_static_fdb_entries > 0);
  41                 fdb_entry->network->n_static_fdb_entries--;
  42
  43                 if (fdb_entry->section)
  44                         hashmap_remove(fdb_entry->network->fdb_entries_by_section, fdb_entry->section);
  45         }
  46
  47         network_config_section_free(fdb_entry->section);
  48         return mfree(fdb_entry);
  49 }
  50
  51 DEFINE_NETWORK_SECTION_FUNCTIONS(FdbEntry, fdb_entry_free);
  52
  53 /* create a new FDB entry or get an existing one. */
  54 static int fdb_entry_new_static(
  55                 Network *network,
  56                 const char *filename,
  57                 unsigned section_line,
  58                 FdbEntry **ret) {
  59
  60         _cleanup_(network_config_section_freep) NetworkConfigSection *n = NULL;
  61         _cleanup_(fdb_entry_freep) FdbEntry *fdb_entry = NULL;
  62         int r;
  63
  64         assert(network);
  65         assert(ret);
  66         assert(!!filename == (section_line > 0));
  67
  68         /* search entry in hashmap first. */
  69         if (filename) {
  70                 r = network_config_section_new(filename, section_line, &n);
  71                 if (r < 0)
  72                         return r;
  73
  74                 fdb_entry = hashmap_get(network->fdb_entries_by_section, n);
  75                 if (fdb_entry) {
  76                         *ret = TAKE_PTR(fdb_entry);
  77
  78                         return 0;
  79                 }
  80         }
  81
  82         if (network->n_static_fdb_entries >= STATIC_FDB_ENTRIES_PER_NETWORK_MAX)
  83                 return -E2BIG;
  84
  85         /* allocate space for and FDB entry. */
  86         fdb_entry = new(FdbEntry, 1);
  87         if (!fdb_entry)
  88                 return -ENOMEM;
  89
  90         /* init FDB structure. */
  91         *fdb_entry = (FdbEntry) {
  92                 .network = network,
  93                 .vni = VXLAN_VID_MAX + 1,
  94                 .fdb_ntf_flags = NEIGHBOR_CACHE_ENTRY_FLAGS_SELF,
  95         };
  96
  97         LIST_PREPEND(static_fdb_entries, network->static_fdb_entries, fdb_entry);
  98         network->n_static_fdb_entries++;
  99
 100         if (filename) {
 101                 fdb_entry->section = TAKE_PTR(n);
 102
 103                 r = hashmap_ensure_allocated(&network->fdb_entries_by_section, &network_config_hash_ops);
 104                 if (r < 0)
 105                         return r;
 106
 107                 r = hashmap_put(network->fdb_entries_by_section, fdb_entry->section, fdb_entry);
 108                 if (r < 0)
 109                         return r;
 110         }
 111
 112         /* return allocated FDB structure. */
 113         *ret = TAKE_PTR(fdb_entry);
 114
 115         return 0;
 116 }
 117
 118 static int set_fdb_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
 119         int r;
 120
 121         assert(link);
 122
 123         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 124                 return 1;
 125
 126         r = sd_netlink_message_get_errno(m);
 127         if (r < 0 && r != -EEXIST) {
 128                 log_link_message_warning_errno(link, m, r, "Could not add FDB entry");
 129                 link_enter_failed(link);
 130                 return 1;
 131         }
 132
 133         return 1;
 134 }
 135
 136 /* send a request to the kernel to add a FDB entry in its static MAC table. */
 137 int fdb_entry_configure(Link *link, FdbEntry *fdb_entry) {
 138         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
 139         int r;
 140
 141         assert(link);
 142         assert(link->network);
 143         assert(link->manager);
 144         assert(fdb_entry);
 145
 146         /* create new RTM message */
 147         r = sd_rtnl_message_new_neigh(link->manager->rtnl, &req, RTM_NEWNEIGH, link->ifindex, AF_BRIDGE);
 148         if (r < 0)
 149                 return log_link_error_errno(link, r, "Could not create RTM_NEWNEIGH message: %m");
 150
 151         r = sd_rtnl_message_neigh_set_flags(req, fdb_entry->fdb_ntf_flags);
 152         if (r < 0)
 153                 return log_link_error_errno(link, r, "Could not set neighbor flags: %m");
 154
 155         /* only NUD_PERMANENT state supported. */
 156         r = sd_rtnl_message_neigh_set_state(req, NUD_NOARP | NUD_PERMANENT);
 157         if (r < 0)
 158                 return log_link_error_errno(link, r, "Could not set neighbor state: %m");
 159
 160         r = sd_netlink_message_append_data(req, NDA_LLADDR, &fdb_entry->mac_addr, sizeof(fdb_entry->mac_addr));
 161         if (r < 0)
 162                 return log_link_error_errno(link, r, "Could not append NDA_LLADDR attribute: %m");
 163
 164         /* VLAN Id is optional. We'll add VLAN Id only if it's specified. */
 165         if (fdb_entry->vlan_id > 0) {
 166                 r = sd_netlink_message_append_u16(req, NDA_VLAN, fdb_entry->vlan_id);
 167                 if (r < 0)
 168                         return log_link_error_errno(link, r, "Could not append NDA_VLAN attribute: %m");
 169         }
 170
 171         if (!in_addr_is_null(fdb_entry->family, &fdb_entry->destination_addr)) {
 172                 r = netlink_message_append_in_addr_union(req, NDA_DST, fdb_entry->family, &fdb_entry->destination_addr);
 173                 if (r < 0)
 174                         return log_link_error_errno(link, r, "Could not append NDA_DST attribute: %m");
 175         }
 176
 177         if (fdb_entry->vni <= VXLAN_VID_MAX) {
 178                 r = sd_netlink_message_append_u32(req, NDA_VNI, fdb_entry->vni);
 179                 if (r < 0)
 180                         return log_link_error_errno(link, r, "Could not append NDA_VNI attribute: %m");
 181         }
 182
 183         /* send message to the kernel to update its internal static MAC table. */
 184         r = netlink_call_async(link->manager->rtnl, NULL, req, set_fdb_handler,
 185                                link_netlink_destroy_callback, link);
 186         if (r < 0)
 187                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
 188
 189         link_ref(link);
 190
 191         return 1;
 192 }
 193
 194 /* parse the HW address from config files. */
 195 int config_parse_fdb_hwaddr(
 196                 const char *unit,
 197                 const char *filename,
 198                 unsigned line,
 199                 const char *section,
 200                 unsigned section_line,
 201                 const char *lvalue,
 202                 int ltype,
 203                 const char *rvalue,
 204                 void *data,
 205                 void *userdata) {
 206
 207         Network *network = userdata;
 208         _cleanup_(fdb_entry_free_or_set_invalidp) FdbEntry *fdb_entry = NULL;
 209         int r;
 210
 211         assert(filename);
 212         assert(section);
 213         assert(lvalue);
 214         assert(rvalue);
 215         assert(data);
 216
 217         r = fdb_entry_new_static(network, filename, section_line, &fdb_entry);
 218         if (r < 0)
 219                 return log_oom();
 220
 221         r = ether_addr_from_string(rvalue, &fdb_entry->mac_addr);
 222         if (r < 0) {
 223                 log_syntax(unit, LOG_WARNING, filename, line, r, "Not a valid MAC address, ignoring assignment: %s", rvalue);
 224                 return 0;
 225         }
 226
 227         fdb_entry = NULL;
 228
 229         return 0;
 230 }
 231
 232 /* parse the VLAN Id from config files. */
 233 int config_parse_fdb_vlan_id(
 234                 const char *unit,
 235                 const char *filename,
 236                 unsigned line,
 237                 const char *section,
 238                 unsigned section_line,
 239                 const char *lvalue,
 240                 int ltype,
 241                 const char *rvalue,
 242                 void *data,
 243                 void *userdata) {
 244
 245         Network *network = userdata;
 246         _cleanup_(fdb_entry_free_or_set_invalidp) FdbEntry *fdb_entry = NULL;
 247         int r;
 248
 249         assert(filename);
 250         assert(section);
 251         assert(lvalue);
 252         assert(rvalue);
 253         assert(data);
 254
 255         r = fdb_entry_new_static(network, filename, section_line, &fdb_entry);
 256         if (r < 0)
 257                 return log_oom();
 258
 259         r = config_parse_vlanid(unit, filename, line, section,
 260                                 section_line, lvalue, ltype,
 261                                 rvalue, &fdb_entry->vlan_id, userdata);
 262         if (r < 0)
 263                 return r;
 264
 265         fdb_entry = NULL;
 266
 267         return 0;
 268 }
 269
 270 int config_parse_fdb_destination(
 271                 const char *unit,
 272                 const char *filename,
 273                 unsigned line,
 274                 const char *section,
 275                 unsigned section_line,
 276                 const char *lvalue,
 277                 int ltype,
 278                 const char *rvalue,
 279                 void *data,
 280                 void *userdata) {
 281
 282         _cleanup_(fdb_entry_free_or_set_invalidp) FdbEntry *fdb_entry = NULL;
 283         Network *network = userdata;
 284         int r;
 285
 286         assert(filename);
 287         assert(section);
 288         assert(lvalue);
 289         assert(rvalue);
 290         assert(data);
 291
 292         r = fdb_entry_new_static(network, filename, section_line, &fdb_entry);
 293         if (r < 0)
 294                 return log_oom();
 295
 296         r = in_addr_from_string_auto(rvalue, &fdb_entry->family, &fdb_entry->destination_addr);
 297         if (r < 0) {
 298                 log_syntax(unit, LOG_WARNING, filename, line, r,
 299                            "FDB destination IP address is invalid, ignoring assignment: %s",
 300                            rvalue);
 301                 return 0;
 302         }
 303
 304         fdb_entry = NULL;
 305
 306         return 0;
 307 }
 308
 309 int config_parse_fdb_vxlan_vni(
 310                 const char *unit,
 311                 const char *filename,
 312                 unsigned line,
 313                 const char *section,
 314                 unsigned section_line,
 315                 const char *lvalue,
 316                 int ltype,
 317                 const char *rvalue,
 318                 void *data,
 319                 void *userdata) {
 320
 321         _cleanup_(fdb_entry_free_or_set_invalidp) FdbEntry *fdb_entry = NULL;
 322         Network *network = userdata;
 323         uint32_t vni;
 324         int r;
 325
 326         assert(filename);
 327         assert(section);
 328         assert(lvalue);
 329         assert(rvalue);
 330         assert(data);
 331
 332         r = fdb_entry_new_static(network, filename, section_line, &fdb_entry);
 333         if (r < 0)
 334                 return log_oom();
 335
 336         r = safe_atou32(rvalue, &vni);
 337         if (r < 0) {
 338                 log_syntax(unit, LOG_WARNING, filename, line, r,
 339                            "Failed to parse VXLAN Network Identifier (VNI), ignoring assignment: %s",
 340                            rvalue);
 341                 return 0;
 342         }
 343
 344         if (vni > VXLAN_VID_MAX) {
 345                 log_syntax(unit, LOG_WARNING, filename, line, 0,
 346                            "FDB invalid VXLAN Network Identifier (VNI), ignoring assignment: %s",
 347                            rvalue);
 348                 return 0;
 349         }
 350
 351         fdb_entry->vni = vni;
 352         fdb_entry = NULL;
 353
 354         return 0;
 355 }
 356
 357 int config_parse_fdb_ntf_flags(
 358                 const char *unit,
 359                 const char *filename,
 360                 unsigned line,
 361                 const char *section,
 362                 unsigned section_line,
 363                 const char *lvalue,
 364                 int ltype,
 365                 const char *rvalue,
 366                 void *data,
 367                 void *userdata) {
 368
 369         _cleanup_(fdb_entry_free_or_set_invalidp) FdbEntry *fdb_entry = NULL;
 370         Network *network = userdata;
 371         NeighborCacheEntryFlags f;
 372         int r;
 373
 374         assert(filename);
 375         assert(section);
 376         assert(lvalue);
 377         assert(rvalue);
 378         assert(data);
 379
 380         r = fdb_entry_new_static(network, filename, section_line, &fdb_entry);
 381         if (r < 0)
 382                 return log_oom();
 383
 384         f = fdb_ntf_flags_from_string(rvalue);
 385         if (f < 0) {
 386                 log_syntax(unit, LOG_WARNING, filename, line, SYNTHETIC_ERRNO(EINVAL),
 387                            "FDB failed to parse AssociatedWith=, ignoring assignment: %s",
 388                            rvalue);
 389                 return 0;
 390         }
 391
 392         fdb_entry->fdb_ntf_flags = f;
 393         fdb_entry = NULL;
 394
 395         return 0;
 396 }