262 lines
8.0 KiB
C
262 lines
8.0 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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/***
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This file is part of systemd.
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Copyright (C) 2014 Intel Corporation. All rights reserved.
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <net/ethernet.h>
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#include <net/if.h>
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#include "alloc-util.h"
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#include "conf-parser.h"
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#include "netdev/bridge.h"
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#include "netlink-util.h"
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#include "networkd-fdb.h"
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#include "networkd-manager.h"
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#include "util.h"
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#include "vlan-util.h"
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#define STATIC_FDB_ENTRIES_PER_NETWORK_MAX 1024U
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/* create a new FDB entry or get an existing one. */
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int fdb_entry_new_static(
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Network *network,
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unsigned section,
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FdbEntry **ret) {
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_cleanup_fdbentry_free_ FdbEntry *fdb_entry = NULL;
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struct ether_addr *mac_addr = NULL;
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assert(network);
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assert(ret);
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/* search entry in hashmap first. */
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if (section) {
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fdb_entry = hashmap_get(network->fdb_entries_by_section, UINT_TO_PTR(section));
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if (fdb_entry) {
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*ret = TAKE_PTR(fdb_entry);
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return 0;
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}
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}
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if (network->n_static_fdb_entries >= STATIC_FDB_ENTRIES_PER_NETWORK_MAX)
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return -E2BIG;
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/* allocate space for MAC address. */
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mac_addr = new0(struct ether_addr, 1);
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if (!mac_addr)
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return -ENOMEM;
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/* allocate space for and FDB entry. */
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fdb_entry = new0(FdbEntry, 1);
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if (!fdb_entry) {
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/* free previously allocated space for mac_addr. */
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free(mac_addr);
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return -ENOMEM;
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}
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/* init FDB structure. */
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fdb_entry->network = network;
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fdb_entry->mac_addr = mac_addr;
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LIST_PREPEND(static_fdb_entries, network->static_fdb_entries, fdb_entry);
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network->n_static_fdb_entries++;
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if (section) {
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fdb_entry->section = section;
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hashmap_put(network->fdb_entries_by_section,
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UINT_TO_PTR(fdb_entry->section), fdb_entry);
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}
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/* return allocated FDB structure. */
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*ret = TAKE_PTR(fdb_entry);
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return 0;
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}
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static int set_fdb_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
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Link *link = userdata;
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int r;
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assert(link);
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r = sd_netlink_message_get_errno(m);
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if (r < 0 && r != -EEXIST)
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log_link_error_errno(link, r, "Could not add FDB entry: %m");
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return 1;
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}
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/* send a request to the kernel to add a FDB entry in its static MAC table. */
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int fdb_entry_configure(Link *link, FdbEntry *fdb_entry) {
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_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
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sd_netlink *rtnl;
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int r;
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uint8_t flags;
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Bridge *bridge;
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assert(link);
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assert(link->network);
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assert(link->manager);
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assert(fdb_entry);
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rtnl = link->manager->rtnl;
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bridge = BRIDGE(link->network->bridge);
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/* create new RTM message */
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r = sd_rtnl_message_new_neigh(rtnl, &req, RTM_NEWNEIGH, link->ifindex, PF_BRIDGE);
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if (r < 0)
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return rtnl_log_create_error(r);
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if (bridge)
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flags = NTF_MASTER;
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else
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flags = NTF_SELF;
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r = sd_rtnl_message_neigh_set_flags(req, flags);
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if (r < 0)
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return rtnl_log_create_error(r);
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/* only NUD_PERMANENT state supported. */
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r = sd_rtnl_message_neigh_set_state(req, NUD_NOARP | NUD_PERMANENT);
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if (r < 0)
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return rtnl_log_create_error(r);
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r = sd_netlink_message_append_ether_addr(req, NDA_LLADDR, fdb_entry->mac_addr);
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if (r < 0)
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return rtnl_log_create_error(r);
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/* VLAN Id is optional. We'll add VLAN Id only if it's specified. */
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if (0 != fdb_entry->vlan_id) {
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r = sd_netlink_message_append_u16(req, NDA_VLAN, fdb_entry->vlan_id);
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if (r < 0)
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return rtnl_log_create_error(r);
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}
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/* send message to the kernel to update its internal static MAC table. */
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r = sd_netlink_call_async(rtnl, req, set_fdb_handler, link, 0, NULL);
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if (r < 0)
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return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
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return 0;
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}
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/* remove and FDB entry. */
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void fdb_entry_free(FdbEntry *fdb_entry) {
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if (!fdb_entry)
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return;
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if (fdb_entry->network) {
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LIST_REMOVE(static_fdb_entries, fdb_entry->network->static_fdb_entries, fdb_entry);
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assert(fdb_entry->network->n_static_fdb_entries > 0);
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fdb_entry->network->n_static_fdb_entries--;
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if (fdb_entry->section)
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hashmap_remove(fdb_entry->network->fdb_entries_by_section, UINT_TO_PTR(fdb_entry->section));
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}
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free(fdb_entry->mac_addr);
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free(fdb_entry);
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}
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/* parse the HW address from config files. */
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int config_parse_fdb_hwaddr(
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const char *unit,
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const char *filename,
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unsigned line,
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const char *section,
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unsigned section_line,
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const char *lvalue,
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int ltype,
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const char *rvalue,
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void *data,
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void *userdata) {
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Network *network = userdata;
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_cleanup_fdbentry_free_ FdbEntry *fdb_entry = NULL;
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int r;
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assert(filename);
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assert(section);
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assert(lvalue);
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assert(rvalue);
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assert(data);
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r = fdb_entry_new_static(network, section_line, &fdb_entry);
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if (r < 0)
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return log_oom();
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/* read in the MAC address for the FDB table. */
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r = sscanf(rvalue, "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
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&fdb_entry->mac_addr->ether_addr_octet[0],
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&fdb_entry->mac_addr->ether_addr_octet[1],
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&fdb_entry->mac_addr->ether_addr_octet[2],
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&fdb_entry->mac_addr->ether_addr_octet[3],
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&fdb_entry->mac_addr->ether_addr_octet[4],
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&fdb_entry->mac_addr->ether_addr_octet[5]);
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if (ETHER_ADDR_LEN != r) {
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log_syntax(unit, LOG_ERR, filename, line, 0, "Not a valid MAC address, ignoring assignment: %s", rvalue);
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return 0;
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}
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fdb_entry = NULL;
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return 0;
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}
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/* parse the VLAN Id from config files. */
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int config_parse_fdb_vlan_id(
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const char *unit,
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const char *filename,
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unsigned line,
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const char *section,
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unsigned section_line,
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const char *lvalue,
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int ltype,
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const char *rvalue,
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void *data,
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void *userdata) {
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Network *network = userdata;
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_cleanup_fdbentry_free_ FdbEntry *fdb_entry = NULL;
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int r;
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assert(filename);
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assert(section);
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assert(lvalue);
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assert(rvalue);
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assert(data);
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r = fdb_entry_new_static(network, section_line, &fdb_entry);
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if (r < 0)
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return log_oom();
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r = config_parse_vlanid(unit, filename, line, section,
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section_line, lvalue, ltype,
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rvalue, &fdb_entry->vlan_id, userdata);
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if (r < 0)
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return r;
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fdb_entry = NULL;
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return 0;
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}
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