src/network/networkd-fdb.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright (C) 2014 Intel Corporation. All rights reserved.
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <net/ethernet.h>
  23 #include <net/if.h>
  24
  25 #include "alloc-util.h"
  26 #include "conf-parser.h"
  27 #include "netlink-util.h"
  28 #include "networkd-fdb.h"
  29 #include "networkd.h"
  30 #include "util.h"
  31
  32 /* create a new FDB entry or get an existing one. */
  33 int fdb_entry_new_static(Network *const network,
  34                          const unsigned section,
  35                          FdbEntry **ret) {
  36         _cleanup_fdbentry_free_ FdbEntry *fdb_entry = NULL;
  37         struct ether_addr *mac_addr = NULL;
  38
  39         assert(network);
  40
  41         /* search entry in hashmap first. */
  42         if(section) {
  43                 fdb_entry = hashmap_get(network->fdb_entries_by_section, UINT_TO_PTR(section));
  44                 if (fdb_entry) {
  45                         *ret = fdb_entry;
  46                         fdb_entry = NULL;
  47
  48                         return 0;
  49                 }
  50         }
  51
  52         /* allocate space for MAC address. */
  53         mac_addr = new0(struct ether_addr, 1);
  54         if (!mac_addr)
  55                 return -ENOMEM;
  56
  57         /* allocate space for and FDB entry. */
  58         fdb_entry = new0(FdbEntry, 1);
  59
  60         if (!fdb_entry) {
  61                 /* free previously allocated space for mac_addr. */
  62                 free(mac_addr);
  63                 return -ENOMEM;
  64         }
  65
  66         /* init FDB structure. */
  67         fdb_entry->network = network;
  68         fdb_entry->mac_addr = mac_addr;
  69
  70         LIST_PREPEND(static_fdb_entries, network->static_fdb_entries, fdb_entry);
  71
  72         if (section) {
  73                 fdb_entry->section = section;
  74                 hashmap_put(network->fdb_entries_by_section,
  75                             UINT_TO_PTR(fdb_entry->section), fdb_entry);
  76         }
  77
  78         /* return allocated FDB structure. */
  79         *ret = fdb_entry;
  80         fdb_entry = NULL;
  81
  82         return 0;
  83 }
  84
  85 static int set_fdb_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
  86         Link *link = userdata;
  87         int r;
  88
  89         assert(link);
  90
  91         r = sd_netlink_message_get_errno(m);
  92         if (r < 0 && r != -EEXIST)
  93                 log_link_error_errno(link, r, "Could not add FDB entry: %m");
  94
  95         return 1;
  96 }
  97
  98 /* send a request to the kernel to add a FDB entry in its static MAC table. */
  99 int fdb_entry_configure(Link *const link, FdbEntry *const fdb_entry) {
 100         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
 101         sd_netlink *rtnl;
 102         int r;
 103
 104         assert(link);
 105         assert(link->manager);
 106         assert(fdb_entry);
 107
 108         rtnl = link->manager->rtnl;
 109
 110         /* create new RTM message */
 111         r = sd_rtnl_message_new_neigh(rtnl, &req, RTM_NEWNEIGH, link->ifindex, PF_BRIDGE);
 112         if (r < 0)
 113                 return rtnl_log_create_error(r);
 114
 115         /* only NTF_SELF flag supported. */
 116         r = sd_rtnl_message_neigh_set_flags(req, NTF_SELF);
 117         if (r < 0)
 118                 return rtnl_log_create_error(r);
 119
 120         /* only NUD_PERMANENT state supported. */
 121         r = sd_rtnl_message_neigh_set_state(req, NUD_NOARP | NUD_PERMANENT);
 122         if (r < 0)
 123                 return rtnl_log_create_error(r);
 124
 125         r = sd_netlink_message_append_ether_addr(req, NDA_LLADDR, fdb_entry->mac_addr);
 126         if (r < 0)
 127                 return rtnl_log_create_error(r);
 128
 129         /* VLAN Id is optional. We'll add VLAN Id only if it's specified. */
 130         if (0 != fdb_entry->vlan_id) {
 131                 r = sd_netlink_message_append_u16(req, NDA_VLAN, fdb_entry->vlan_id);
 132                 if (r < 0)
 133                         return rtnl_log_create_error(r);
 134         }
 135
 136         /* send message to the kernel to update its internal static MAC table. */
 137         r = sd_netlink_call_async(rtnl, req, set_fdb_handler, link, 0, NULL);
 138         if (r < 0)
 139                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
 140
 141         return 0;
 142 }
 143
 144 /* remove and FDB entry. */
 145 void fdb_entry_free(FdbEntry *fdb_entry) {
 146         if(!fdb_entry)
 147                 return;
 148
 149         if(fdb_entry->network) {
 150                 LIST_REMOVE(static_fdb_entries, fdb_entry->network->static_fdb_entries,
 151                             fdb_entry);
 152
 153                 if (fdb_entry->section)
 154                         hashmap_remove(fdb_entry->network->fdb_entries_by_section,
 155                                        UINT_TO_PTR(fdb_entry->section));
 156         }
 157
 158         free(fdb_entry->mac_addr);
 159
 160         free(fdb_entry);
 161 }
 162
 163 /* parse the HW address from config files. */
 164 int config_parse_fdb_hwaddr(
 165                 const char *unit,
 166                 const char *filename,
 167                 unsigned line,
 168                 const char *section,
 169                 unsigned section_line,
 170                 const char *lvalue,
 171                 int ltype,
 172                 const char *rvalue,
 173                 void *data,
 174                 void *userdata) {
 175
 176         Network *network = userdata;
 177         _cleanup_fdbentry_free_ FdbEntry *fdb_entry = NULL;
 178         int r;
 179
 180         assert(filename);
 181         assert(section);
 182         assert(lvalue);
 183         assert(rvalue);
 184         assert(data);
 185
 186         r = fdb_entry_new_static(network, section_line, &fdb_entry);
 187         if (r < 0)
 188                 return log_oom();
 189
 190         /* read in the MAC address for the FDB table. */
 191         r = sscanf(rvalue, "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
 192                    &fdb_entry->mac_addr->ether_addr_octet[0],
 193                    &fdb_entry->mac_addr->ether_addr_octet[1],
 194                    &fdb_entry->mac_addr->ether_addr_octet[2],
 195                    &fdb_entry->mac_addr->ether_addr_octet[3],
 196                    &fdb_entry->mac_addr->ether_addr_octet[4],
 197                    &fdb_entry->mac_addr->ether_addr_octet[5]);
 198
 199         if (ETHER_ADDR_LEN != r) {
 200                 log_syntax(unit, LOG_ERR, filename, line, 0, "Not a valid MAC address, ignoring assignment: %s", rvalue);
 201                 return 0;
 202         }
 203
 204         fdb_entry = NULL;
 205
 206         return 0;
 207 }
 208
 209 /* parse the VLAN Id from config files. */
 210 int config_parse_fdb_vlan_id(
 211                 const char *unit,
 212                 const char *filename,
 213                 unsigned line,
 214                 const char *section,
 215                 unsigned section_line,
 216                 const char *lvalue,
 217                 int ltype,
 218                 const char *rvalue,
 219                 void *data,
 220                 void *userdata) {
 221
 222         Network *network = userdata;
 223         _cleanup_fdbentry_free_ FdbEntry *fdb_entry = NULL;
 224         int r;
 225
 226         assert(filename);
 227         assert(section);
 228         assert(lvalue);
 229         assert(rvalue);
 230         assert(data);
 231
 232         r = fdb_entry_new_static(network, section_line, &fdb_entry);
 233         if (r < 0)
 234                 return log_oom();
 235
 236         r = config_parse_unsigned(unit, filename, line, section,
 237                                   section_line, lvalue, ltype,
 238                                   rvalue, &fdb_entry->vlan_id, userdata);
 239         if (r < 0)
 240                 return r;
 241
 242         fdb_entry = NULL;
 243
 244         return 0;
 245 }