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/if.h>
  23 #include <net/ethernet.h>
  24
  25 #include "networkd.h"
  26 #include "networkd-link.h"
  27 #include "conf-parser.h"
  28 #include "util.h"
  29
  30 /* create a new FDB entry or get an existing one. */
  31 int fdb_entry_new_static(Network *const network,
  32                          const unsigned section,
  33                          FdbEntry **ret) {
  34         _cleanup_fdbentry_free_ FdbEntry *fdb_entry = NULL;
  35         struct ether_addr *mac_addr = NULL;
  36
  37         assert(network);
  38
  39         /* search entry in hashmap first. */
  40         if(section) {
  41                 fdb_entry = hashmap_get(network->fdb_entries_by_section, UINT_TO_PTR(section));
  42                 if (fdb_entry) {
  43                         *ret = fdb_entry;
  44                         fdb_entry = NULL;
  45
  46                         return 0;
  47                 }
  48         }
  49
  50         /* allocate space for MAC address. */
  51         mac_addr = new0(struct ether_addr, 1);
  52         if (!mac_addr)
  53                 return -ENOMEM;
  54
  55         /* allocate space for and FDB entry. */
  56         fdb_entry = new0(FdbEntry, 1);
  57
  58         if (!fdb_entry) {
  59                 /* free previously allocated space for mac_addr. */
  60                 free(mac_addr);
  61                 return -ENOMEM;
  62         }
  63
  64         /* init FDB structure. */
  65         fdb_entry->network = network;
  66         fdb_entry->mac_addr = mac_addr;
  67
  68         LIST_PREPEND(static_fdb_entries, network->static_fdb_entries, fdb_entry);
  69
  70         if (section) {
  71                 fdb_entry->section = section;
  72                 hashmap_put(network->fdb_entries_by_section,
  73                             UINT_TO_PTR(fdb_entry->section), fdb_entry);
  74         }
  75
  76         /* return allocated FDB structure. */
  77         *ret = fdb_entry;
  78         fdb_entry = NULL;
  79
  80         return 0;
  81 }
  82
  83 static int set_fdb_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
  84         Link *link = userdata;
  85         int r;
  86
  87         assert(link);
  88
  89         r = sd_netlink_message_get_errno(m);
  90         if (r < 0 && r != -EEXIST)
  91                 log_link_error_errno(link, r, "Could not add FDB entry: %m");
  92
  93         return 1;
  94 }
  95
  96 /* send a request to the kernel to add a FDB entry in its static MAC table. */
  97 int fdb_entry_configure(Link *const link, FdbEntry *const fdb_entry) {
  98         _cleanup_netlink_message_unref_ sd_netlink_message *req = NULL;
  99         sd_netlink *rtnl;
 100         int r;
 101
 102         assert(link);
 103         assert(link->manager);
 104         assert(fdb_entry);
 105
 106         rtnl = link->manager->rtnl;
 107
 108         /* create new RTM message */
 109         r = sd_rtnl_message_new_neigh(rtnl, &req, RTM_NEWNEIGH, link->ifindex, PF_BRIDGE);
 110         if (r < 0)
 111                 return rtnl_log_create_error(r);
 112
 113         /* only NTF_SELF flag supported. */
 114         r = sd_rtnl_message_neigh_set_flags(req, NTF_SELF);
 115         if (r < 0)
 116                 return rtnl_log_create_error(r);
 117
 118         /* only NUD_PERMANENT state supported. */
 119         r = sd_rtnl_message_neigh_set_state(req, NUD_NOARP | NUD_PERMANENT);
 120         if (r < 0)
 121                 return rtnl_log_create_error(r);
 122
 123         r = sd_netlink_message_append_ether_addr(req, NDA_LLADDR, fdb_entry->mac_addr);
 124         if (r < 0)
 125                 return rtnl_log_create_error(r);
 126
 127         /* VLAN Id is optional. We'll add VLAN Id only if it's specified. */
 128         if (0 != fdb_entry->vlan_id) {
 129                 r = sd_netlink_message_append_u16(req, NDA_VLAN, fdb_entry->vlan_id);
 130                 if (r < 0)
 131                         return rtnl_log_create_error(r);
 132         }
 133
 134         /* send message to the kernel to update its internal static MAC table. */
 135         r = sd_netlink_call_async(rtnl, req, set_fdb_handler, link, 0, NULL);
 136         if (r < 0)
 137                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
 138
 139         return 0;
 140 }
 141
 142 /* remove and FDB entry. */
 143 void fdb_entry_free(FdbEntry *fdb_entry) {
 144         if(!fdb_entry)
 145                 return;
 146
 147         if(fdb_entry->network) {
 148                 LIST_REMOVE(static_fdb_entries, fdb_entry->network->static_fdb_entries,
 149                             fdb_entry);
 150
 151                 if (fdb_entry->section)
 152                         hashmap_remove(fdb_entry->network->fdb_entries_by_section,
 153                                        UINT_TO_PTR(fdb_entry->section));
 154         }
 155
 156         free(fdb_entry->mac_addr);
 157
 158         free(fdb_entry);
 159 }
 160
 161 /* parse the HW address from config files. */
 162 int config_parse_fdb_hwaddr(
 163                 const char *unit,
 164                 const char *filename,
 165                 unsigned line,
 166                 const char *section,
 167                 unsigned section_line,
 168                 const char *lvalue,
 169                 int ltype,
 170                 const char *rvalue,
 171                 void *data,
 172                 void *userdata) {
 173
 174         Network *network = userdata;
 175         _cleanup_fdbentry_free_ FdbEntry *fdb_entry = NULL;
 176         int r;
 177
 178         assert(filename);
 179         assert(section);
 180         assert(lvalue);
 181         assert(rvalue);
 182         assert(data);
 183
 184         r = fdb_entry_new_static(network, section_line, &fdb_entry);
 185         if (r < 0)
 186                 return log_oom();
 187
 188         /* read in the MAC address for the FDB table. */
 189         r = sscanf(rvalue, "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
 190                    &fdb_entry->mac_addr->ether_addr_octet[0],
 191                    &fdb_entry->mac_addr->ether_addr_octet[1],
 192                    &fdb_entry->mac_addr->ether_addr_octet[2],
 193                    &fdb_entry->mac_addr->ether_addr_octet[3],
 194                    &fdb_entry->mac_addr->ether_addr_octet[4],
 195                    &fdb_entry->mac_addr->ether_addr_octet[5]);
 196
 197         if (ETHER_ADDR_LEN != r) {
 198                 log_syntax(unit, LOG_ERR, filename, line, EINVAL, "Not a valid MAC address, ignoring assignment: %s", rvalue);
 199                 return 0;
 200         }
 201
 202         fdb_entry = NULL;
 203
 204         return 0;
 205 }
 206
 207 /* parse the VLAN Id from config files. */
 208 int config_parse_fdb_vlan_id(
 209                 const char *unit,
 210                 const char *filename,
 211                 unsigned line,
 212                 const char *section,
 213                 unsigned section_line,
 214                 const char *lvalue,
 215                 int ltype,
 216                 const char *rvalue,
 217                 void *data,
 218                 void *userdata) {
 219
 220         Network *network = userdata;
 221         _cleanup_fdbentry_free_ FdbEntry *fdb_entry = NULL;
 222         int r;
 223
 224         assert(filename);
 225         assert(section);
 226         assert(lvalue);
 227         assert(rvalue);
 228         assert(data);
 229
 230         r = fdb_entry_new_static(network, section_line, &fdb_entry);
 231         if (r < 0)
 232                 return log_oom();
 233
 234         r = config_parse_unsigned(unit, filename, line, section,
 235                                   section_line, lvalue, ltype,
 236                                   rvalue, &fdb_entry->vlan_id, userdata);
 237         if (r < 0)
 238                 return r;
 239
 240         fdb_entry = NULL;
 241
 242         return 0;
 243 }