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 "conf-parser.h"
  11 #include "netdev/bridge.h"
  12 #include "netdev/vxlan.h"
  13 #include "netlink-util.h"
  14 #include "networkd-fdb.h"
  15 #include "networkd-manager.h"
  16 #include "parse-util.h"
  17 #include "string-util.h"
  18 #include "string-table.h"
  19 #include "util.h"
  20 #include "vlan-util.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 /* create a new FDB entry or get an existing one. */
  34 static int fdb_entry_new_static(
  35                 Network *network,
  36                 const char *filename,
  37                 unsigned section_line,
  38                 FdbEntry **ret) {
  39
  40         _cleanup_(network_config_section_freep) NetworkConfigSection *n = NULL;
  41         _cleanup_(fdb_entry_freep) FdbEntry *fdb_entry = NULL;
  42         _cleanup_free_ struct ether_addr *mac_addr = NULL;
  43         int r;
  44
  45         assert(network);
  46         assert(ret);
  47         assert(!!filename == (section_line > 0));
  48
  49         /* search entry in hashmap first. */
  50         if (filename) {
  51                 r = network_config_section_new(filename, section_line, &n);
  52                 if (r < 0)
  53                         return r;
  54
  55                 fdb_entry = hashmap_get(network->fdb_entries_by_section, n);
  56                 if (fdb_entry) {
  57                         *ret = TAKE_PTR(fdb_entry);
  58
  59                         return 0;
  60                 }
  61         }
  62
  63         if (network->n_static_fdb_entries >= STATIC_FDB_ENTRIES_PER_NETWORK_MAX)
  64                 return -E2BIG;
  65
  66         /* allocate space for MAC address. */
  67         mac_addr = new0(struct ether_addr, 1);
  68         if (!mac_addr)
  69                 return -ENOMEM;
  70
  71         /* allocate space for and FDB entry. */
  72         fdb_entry = new(FdbEntry, 1);
  73         if (!fdb_entry)
  74                 return -ENOMEM;
  75
  76         /* init FDB structure. */
  77         *fdb_entry = (FdbEntry) {
  78                 .network = network,
  79                 .mac_addr = TAKE_PTR(mac_addr),
  80                 .vni = VXLAN_VID_MAX + 1,
  81                 .fdb_ntf_flags = NEIGHBOR_CACHE_ENTRY_FLAGS_SELF,
  82         };
  83
  84         LIST_PREPEND(static_fdb_entries, network->static_fdb_entries, fdb_entry);
  85         network->n_static_fdb_entries++;
  86
  87         if (filename) {
  88                 fdb_entry->section = TAKE_PTR(n);
  89
  90                 r = hashmap_ensure_allocated(&network->fdb_entries_by_section, &network_config_hash_ops);
  91                 if (r < 0)
  92                         return r;
  93
  94                 r = hashmap_put(network->fdb_entries_by_section, fdb_entry->section, fdb_entry);
  95                 if (r < 0)
  96                         return r;
  97         }
  98
  99         /* return allocated FDB structure. */
 100         *ret = TAKE_PTR(fdb_entry);
 101
 102         return 0;
 103 }
 104
 105 static int set_fdb_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
 106         int r;
 107
 108         assert(link);
 109
 110         r = sd_netlink_message_get_errno(m);
 111         if (r < 0 && r != -EEXIST)
 112                 log_link_error_errno(link, r, "Could not add FDB entry: %m");
 113
 114         return 1;
 115 }
 116
 117 /* send a request to the kernel to add a FDB entry in its static MAC table. */
 118 int fdb_entry_configure(Link *link, FdbEntry *fdb_entry) {
 119         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
 120         int r;
 121
 122         assert(link);
 123         assert(link->network);
 124         assert(link->manager);
 125         assert(fdb_entry);
 126
 127         /* create new RTM message */
 128         r = sd_rtnl_message_new_neigh(link->manager->rtnl, &req, RTM_NEWNEIGH, link->ifindex, PF_BRIDGE);
 129         if (r < 0)
 130                 return rtnl_log_create_error(r);
 131
 132         r = sd_rtnl_message_neigh_set_flags(req, fdb_entry->fdb_ntf_flags);
 133         if (r < 0)
 134                 return rtnl_log_create_error(r);
 135
 136         /* only NUD_PERMANENT state supported. */
 137         r = sd_rtnl_message_neigh_set_state(req, NUD_NOARP | NUD_PERMANENT);
 138         if (r < 0)
 139                 return rtnl_log_create_error(r);
 140
 141         r = sd_netlink_message_append_ether_addr(req, NDA_LLADDR, fdb_entry->mac_addr);
 142         if (r < 0)
 143                 return rtnl_log_create_error(r);
 144
 145         /* VLAN Id is optional. We'll add VLAN Id only if it's specified. */
 146         if (fdb_entry->vlan_id > 0) {
 147                 r = sd_netlink_message_append_u16(req, NDA_VLAN, fdb_entry->vlan_id);
 148                 if (r < 0)
 149                         return rtnl_log_create_error(r);
 150         }
 151
 152         if (!in_addr_is_null(fdb_entry->family, &fdb_entry->destination_addr)) {
 153                 r = netlink_message_append_in_addr_union(req, NDA_DST, fdb_entry->family, &fdb_entry->destination_addr);
 154                 if (r < 0)
 155                         return log_link_error_errno(link, r, "Could not append NDA_DST attribute: %m");
 156         }
 157
 158         if (fdb_entry->vni <= VXLAN_VID_MAX) {
 159                 r = sd_netlink_message_append_u32(req, NDA_VNI, fdb_entry->vni);
 160                 if (r < 0)
 161                         return log_link_error_errno(link, r, "Could not append NDA_VNI attribute: %m");
 162         }
 163
 164         /* send message to the kernel to update its internal static MAC table. */
 165         r = netlink_call_async(link->manager->rtnl, NULL, req, set_fdb_handler,
 166                                link_netlink_destroy_callback, link);
 167         if (r < 0)
 168                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
 169
 170         link_ref(link);
 171
 172         return 0;
 173 }
 174
 175 /* remove and FDB entry. */
 176 void fdb_entry_free(FdbEntry *fdb_entry) {
 177         if (!fdb_entry)
 178                 return;
 179
 180         if (fdb_entry->network) {
 181                 LIST_REMOVE(static_fdb_entries, fdb_entry->network->static_fdb_entries, fdb_entry);
 182                 assert(fdb_entry->network->n_static_fdb_entries > 0);
 183                 fdb_entry->network->n_static_fdb_entries--;
 184
 185                 if (fdb_entry->section)
 186                         hashmap_remove(fdb_entry->network->fdb_entries_by_section, fdb_entry->section);
 187         }
 188
 189         network_config_section_free(fdb_entry->section);
 190         free(fdb_entry->mac_addr);
 191         free(fdb_entry);
 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         /* read in the MAC address for the FDB table. */
 222         r = sscanf(rvalue, "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
 223                    &fdb_entry->mac_addr->ether_addr_octet[0],
 224                    &fdb_entry->mac_addr->ether_addr_octet[1],
 225                    &fdb_entry->mac_addr->ether_addr_octet[2],
 226                    &fdb_entry->mac_addr->ether_addr_octet[3],
 227                    &fdb_entry->mac_addr->ether_addr_octet[4],
 228                    &fdb_entry->mac_addr->ether_addr_octet[5]);
 229
 230         if (r != ETHER_ADDR_LEN) {
 231                 log_syntax(unit, LOG_ERR, filename, line, 0, "Not a valid MAC address, ignoring assignment: %s", rvalue);
 232                 return 0;
 233         }
 234
 235         fdb_entry = NULL;
 236
 237         return 0;
 238 }
 239
 240 /* parse the VLAN Id from config files. */
 241 int config_parse_fdb_vlan_id(
 242                 const char *unit,
 243                 const char *filename,
 244                 unsigned line,
 245                 const char *section,
 246                 unsigned section_line,
 247                 const char *lvalue,
 248                 int ltype,
 249                 const char *rvalue,
 250                 void *data,
 251                 void *userdata) {
 252
 253         Network *network = userdata;
 254         _cleanup_(fdb_entry_free_or_set_invalidp) FdbEntry *fdb_entry = NULL;
 255         int r;
 256
 257         assert(filename);
 258         assert(section);
 259         assert(lvalue);
 260         assert(rvalue);
 261         assert(data);
 262
 263         r = fdb_entry_new_static(network, filename, section_line, &fdb_entry);
 264         if (r < 0)
 265                 return log_oom();
 266
 267         r = config_parse_vlanid(unit, filename, line, section,
 268                                 section_line, lvalue, ltype,
 269                                 rvalue, &fdb_entry->vlan_id, userdata);
 270         if (r < 0)
 271                 return r;
 272
 273         fdb_entry = NULL;
 274
 275         return 0;
 276 }
 277
 278 int config_parse_fdb_destination(
 279                 const char *unit,
 280                 const char *filename,
 281                 unsigned line,
 282                 const char *section,
 283                 unsigned section_line,
 284                 const char *lvalue,
 285                 int ltype,
 286                 const char *rvalue,
 287                 void *data,
 288                 void *userdata) {
 289
 290         _cleanup_(fdb_entry_free_or_set_invalidp) FdbEntry *fdb_entry = NULL;
 291         Network *network = userdata;
 292         int r;
 293
 294         assert(filename);
 295         assert(section);
 296         assert(lvalue);
 297         assert(rvalue);
 298         assert(data);
 299
 300         r = fdb_entry_new_static(network, filename, section_line, &fdb_entry);
 301         if (r < 0)
 302                 return log_oom();
 303
 304         r = in_addr_from_string_auto(rvalue, &fdb_entry->family, &fdb_entry->destination_addr);
 305         if (r < 0)
 306                 return log_syntax(unit, LOG_ERR, filename, line, r,
 307                                   "FDB destination IP address is invalid, ignoring assignment: %s",
 308                                   rvalue);
 309
 310         fdb_entry = NULL;
 311
 312         return 0;
 313 }
 314
 315 int config_parse_fdb_vxlan_vni(
 316                 const char *unit,
 317                 const char *filename,
 318                 unsigned line,
 319                 const char *section,
 320                 unsigned section_line,
 321                 const char *lvalue,
 322                 int ltype,
 323                 const char *rvalue,
 324                 void *data,
 325                 void *userdata) {
 326
 327         _cleanup_(fdb_entry_free_or_set_invalidp) FdbEntry *fdb_entry = NULL;
 328         Network *network = userdata;
 329         uint32_t vni;
 330         int r;
 331
 332         assert(filename);
 333         assert(section);
 334         assert(lvalue);
 335         assert(rvalue);
 336         assert(data);
 337
 338         r = fdb_entry_new_static(network, filename, section_line, &fdb_entry);
 339         if (r < 0)
 340                 return log_oom();
 341
 342         r = safe_atou32(rvalue, &vni);
 343         if (r < 0) {
 344                 log_syntax(unit, LOG_ERR, filename, line, r,
 345                            "Failed to parse VXLAN Network Identifier (VNI), ignoring assignment: %s",
 346                            rvalue);
 347                 return 0;
 348         }
 349
 350         if (vni > VXLAN_VID_MAX) {
 351                 log_syntax(unit, LOG_ERR, filename, line, 0,
 352                            "FDB invalid VXLAN Network Identifier (VNI), ignoring assignment: %s",
 353                            rvalue);
 354                 return 0;
 355         }
 356
 357         fdb_entry->vni = vni;
 358         fdb_entry = NULL;
 359
 360         return 0;
 361 }
 362
 363
 364 int config_parse_fdb_ntf_flags(
 365                 const char *unit,
 366                 const char *filename,
 367                 unsigned line,
 368                 const char *section,
 369                 unsigned section_line,
 370                 const char *lvalue,
 371                 int ltype,
 372                 const char *rvalue,
 373                 void *data,
 374                 void *userdata) {
 375
 376         _cleanup_(fdb_entry_free_or_set_invalidp) FdbEntry *fdb_entry = NULL;
 377         Network *network = userdata;
 378         NeighborCacheEntryFlags f;
 379         int r;
 380
 381         assert(filename);
 382         assert(section);
 383         assert(lvalue);
 384         assert(rvalue);
 385         assert(data);
 386
 387         r = fdb_entry_new_static(network, filename, section_line, &fdb_entry);
 388         if (r < 0)
 389                 return log_oom();
 390
 391         f = fdb_ntf_flags_from_string(rvalue);
 392         if (f < 0) {
 393                 log_syntax(unit, LOG_ERR, filename, line, 0,
 394                            "FDB failed to parse AssociatedWith=, ignoring assignment: %s",
 395                            rvalue);
 396                 return 0;
 397         }
 398
 399         fdb_entry->fdb_ntf_flags = f;
 400         fdb_entry = NULL;
 401
 402         return 0;
 403 }