1 /* SPDX-License-Identifier: LGPL-2.1+ */
3 This file is part of systemd.
5 Copyright (C) 2014 Intel Corporation. All rights reserved.
7 systemd is free software; you can redistribute it and/or modify it
8 under the terms of the GNU Lesser General Public License as published by
9 the Free Software Foundation; either version 2.1 of the License, or
10 (at your option) any later version.
12 systemd is distributed in the hope that it will be useful, but
13 WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Lesser General Public License for more details.
17 You should have received a copy of the GNU Lesser General Public License
18 along with systemd; If not, see <http://www.gnu.org/licenses/>.
21 #include <net/ethernet.h>
24 #include "alloc-util.h"
25 #include "conf-parser.h"
26 #include "netdev/bridge.h"
27 #include "netlink-util.h"
28 #include "networkd-fdb.h"
29 #include "networkd-manager.h"
31 #include "vlan-util.h"
33 #define STATIC_FDB_ENTRIES_PER_NETWORK_MAX 1024U
35 /* create a new FDB entry or get an existing one. */
36 int fdb_entry_new_static(
41 _cleanup_fdbentry_free_ FdbEntry
*fdb_entry
= NULL
;
42 struct ether_addr
*mac_addr
= NULL
;
47 /* search entry in hashmap first. */
49 fdb_entry
= hashmap_get(network
->fdb_entries_by_section
, UINT_TO_PTR(section
));
58 if (network
->n_static_fdb_entries
>= STATIC_FDB_ENTRIES_PER_NETWORK_MAX
)
61 /* allocate space for MAC address. */
62 mac_addr
= new0(struct ether_addr
, 1);
66 /* allocate space for and FDB entry. */
67 fdb_entry
= new0(FdbEntry
, 1);
69 /* free previously allocated space for mac_addr. */
74 /* init FDB structure. */
75 fdb_entry
->network
= network
;
76 fdb_entry
->mac_addr
= mac_addr
;
78 LIST_PREPEND(static_fdb_entries
, network
->static_fdb_entries
, fdb_entry
);
79 network
->n_static_fdb_entries
++;
82 fdb_entry
->section
= section
;
83 hashmap_put(network
->fdb_entries_by_section
,
84 UINT_TO_PTR(fdb_entry
->section
), fdb_entry
);
87 /* return allocated FDB structure. */
94 static int set_fdb_handler(sd_netlink
*rtnl
, sd_netlink_message
*m
, void *userdata
) {
95 Link
*link
= userdata
;
100 r
= sd_netlink_message_get_errno(m
);
101 if (r
< 0 && r
!= -EEXIST
)
102 log_link_error_errno(link
, r
, "Could not add FDB entry: %m");
107 /* send a request to the kernel to add a FDB entry in its static MAC table. */
108 int fdb_entry_configure(Link
*link
, FdbEntry
*fdb_entry
) {
109 _cleanup_(sd_netlink_message_unrefp
) sd_netlink_message
*req
= NULL
;
116 assert(link
->network
);
117 assert(link
->manager
);
120 rtnl
= link
->manager
->rtnl
;
121 bridge
= BRIDGE(link
->network
->bridge
);
123 /* create new RTM message */
124 r
= sd_rtnl_message_new_neigh(rtnl
, &req
, RTM_NEWNEIGH
, link
->ifindex
, PF_BRIDGE
);
126 return rtnl_log_create_error(r
);
133 r
= sd_rtnl_message_neigh_set_flags(req
, flags
);
135 return rtnl_log_create_error(r
);
137 /* only NUD_PERMANENT state supported. */
138 r
= sd_rtnl_message_neigh_set_state(req
, NUD_NOARP
| NUD_PERMANENT
);
140 return rtnl_log_create_error(r
);
142 r
= sd_netlink_message_append_ether_addr(req
, NDA_LLADDR
, fdb_entry
->mac_addr
);
144 return rtnl_log_create_error(r
);
146 /* VLAN Id is optional. We'll add VLAN Id only if it's specified. */
147 if (0 != fdb_entry
->vlan_id
) {
148 r
= sd_netlink_message_append_u16(req
, NDA_VLAN
, fdb_entry
->vlan_id
);
150 return rtnl_log_create_error(r
);
153 /* send message to the kernel to update its internal static MAC table. */
154 r
= sd_netlink_call_async(rtnl
, req
, set_fdb_handler
, link
, 0, NULL
);
156 return log_link_error_errno(link
, r
, "Could not send rtnetlink message: %m");
161 /* remove and FDB entry. */
162 void fdb_entry_free(FdbEntry
*fdb_entry
) {
166 if (fdb_entry
->network
) {
167 LIST_REMOVE(static_fdb_entries
, fdb_entry
->network
->static_fdb_entries
, fdb_entry
);
169 assert(fdb_entry
->network
->n_static_fdb_entries
> 0);
170 fdb_entry
->network
->n_static_fdb_entries
--;
172 if (fdb_entry
->section
)
173 hashmap_remove(fdb_entry
->network
->fdb_entries_by_section
, UINT_TO_PTR(fdb_entry
->section
));
176 free(fdb_entry
->mac_addr
);
181 /* parse the HW address from config files. */
182 int config_parse_fdb_hwaddr(
184 const char *filename
,
187 unsigned section_line
,
194 Network
*network
= userdata
;
195 _cleanup_fdbentry_free_ FdbEntry
*fdb_entry
= NULL
;
204 r
= fdb_entry_new_static(network
, section_line
, &fdb_entry
);
208 /* read in the MAC address for the FDB table. */
209 r
= sscanf(rvalue
, "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
210 &fdb_entry
->mac_addr
->ether_addr_octet
[0],
211 &fdb_entry
->mac_addr
->ether_addr_octet
[1],
212 &fdb_entry
->mac_addr
->ether_addr_octet
[2],
213 &fdb_entry
->mac_addr
->ether_addr_octet
[3],
214 &fdb_entry
->mac_addr
->ether_addr_octet
[4],
215 &fdb_entry
->mac_addr
->ether_addr_octet
[5]);
217 if (ETHER_ADDR_LEN
!= r
) {
218 log_syntax(unit
, LOG_ERR
, filename
, line
, 0, "Not a valid MAC address, ignoring assignment: %s", rvalue
);
227 /* parse the VLAN Id from config files. */
228 int config_parse_fdb_vlan_id(
230 const char *filename
,
233 unsigned section_line
,
240 Network
*network
= userdata
;
241 _cleanup_fdbentry_free_ FdbEntry
*fdb_entry
= NULL
;
250 r
= fdb_entry_new_static(network
, section_line
, &fdb_entry
);
254 r
= config_parse_vlanid(unit
, filename
, line
, section
,
255 section_line
, lvalue
, ltype
,
256 rvalue
, &fdb_entry
->vlan_id
, userdata
);