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