1 /* SPDX-License-Identifier: LGPL-2.1+ */
3 Copyright © 2014 Intel Corporation. All rights reserved.
6 #include <net/ethernet.h>
9 #include "alloc-util.h"
11 #include "conf-parser.h"
12 #include "netlink-util.h"
13 #include "networkd-fdb.h"
14 #include "networkd-manager.h"
15 #include "parse-util.h"
16 #include "string-util.h"
17 #include "string-table.h"
19 #include "vlan-util.h"
22 #define STATIC_FDB_ENTRIES_PER_NETWORK_MAX 1024U
24 static const char* const fdb_ntf_flags_table
[_NEIGHBOR_CACHE_ENTRY_FLAGS_MAX
] = {
25 [NEIGHBOR_CACHE_ENTRY_FLAGS_USE
] = "use",
26 [NEIGHBOR_CACHE_ENTRY_FLAGS_SELF
] = "self",
27 [NEIGHBOR_CACHE_ENTRY_FLAGS_MASTER
] = "master",
28 [NEIGHBOR_CACHE_ENTRY_FLAGS_ROUTER
] = "router",
31 DEFINE_STRING_TABLE_LOOKUP(fdb_ntf_flags
, NeighborCacheEntryFlags
);
33 /* create a new FDB entry or get an existing one. */
34 static int fdb_entry_new_static(
37 unsigned section_line
,
40 _cleanup_(network_config_section_freep
) NetworkConfigSection
*n
= NULL
;
41 _cleanup_(fdb_entry_freep
) FdbEntry
*fdb_entry
= NULL
;
46 assert(!!filename
== (section_line
> 0));
48 /* search entry in hashmap first. */
50 r
= network_config_section_new(filename
, section_line
, &n
);
54 fdb_entry
= hashmap_get(network
->fdb_entries_by_section
, n
);
56 *ret
= TAKE_PTR(fdb_entry
);
62 if (network
->n_static_fdb_entries
>= STATIC_FDB_ENTRIES_PER_NETWORK_MAX
)
65 /* allocate space for and FDB entry. */
66 fdb_entry
= new(FdbEntry
, 1);
70 /* init FDB structure. */
71 *fdb_entry
= (FdbEntry
) {
73 .vni
= VXLAN_VID_MAX
+ 1,
74 .fdb_ntf_flags
= NEIGHBOR_CACHE_ENTRY_FLAGS_SELF
,
77 LIST_PREPEND(static_fdb_entries
, network
->static_fdb_entries
, fdb_entry
);
78 network
->n_static_fdb_entries
++;
81 fdb_entry
->section
= TAKE_PTR(n
);
83 r
= hashmap_ensure_allocated(&network
->fdb_entries_by_section
, &network_config_hash_ops
);
87 r
= hashmap_put(network
->fdb_entries_by_section
, fdb_entry
->section
, fdb_entry
);
92 /* return allocated FDB structure. */
93 *ret
= TAKE_PTR(fdb_entry
);
98 static int set_fdb_handler(sd_netlink
*rtnl
, sd_netlink_message
*m
, Link
*link
) {
103 if (IN_SET(link
->state
, LINK_STATE_FAILED
, LINK_STATE_LINGER
))
106 r
= sd_netlink_message_get_errno(m
);
107 if (r
< 0 && r
!= -EEXIST
) {
108 log_link_message_warning_errno(link
, m
, r
, "Could not add FDB entry");
109 link_enter_failed(link
);
116 /* send a request to the kernel to add a FDB entry in its static MAC table. */
117 int fdb_entry_configure(Link
*link
, FdbEntry
*fdb_entry
) {
118 _cleanup_(sd_netlink_message_unrefp
) sd_netlink_message
*req
= NULL
;
122 assert(link
->network
);
123 assert(link
->manager
);
126 /* create new RTM message */
127 r
= sd_rtnl_message_new_neigh(link
->manager
->rtnl
, &req
, RTM_NEWNEIGH
, link
->ifindex
, PF_BRIDGE
);
129 return log_link_error_errno(link
, r
, "Could not create RTM_NEWNEIGH message: %m");
131 r
= sd_rtnl_message_neigh_set_flags(req
, fdb_entry
->fdb_ntf_flags
);
133 return log_link_error_errno(link
, r
, "Could not set neighbor flags: %m");
135 /* only NUD_PERMANENT state supported. */
136 r
= sd_rtnl_message_neigh_set_state(req
, NUD_NOARP
| NUD_PERMANENT
);
138 return log_link_error_errno(link
, r
, "Could not set neighbor state: %m");
140 r
= sd_netlink_message_append_data(req
, NDA_LLADDR
, &fdb_entry
->mac_addr
, sizeof(fdb_entry
->mac_addr
));
142 return log_link_error_errno(link
, r
, "Could not append NDA_LLADDR attribute: %m");
144 /* VLAN Id is optional. We'll add VLAN Id only if it's specified. */
145 if (fdb_entry
->vlan_id
> 0) {
146 r
= sd_netlink_message_append_u16(req
, NDA_VLAN
, fdb_entry
->vlan_id
);
148 return log_link_error_errno(link
, r
, "Could not append NDA_VLAN attribute: %m");
151 if (!in_addr_is_null(fdb_entry
->family
, &fdb_entry
->destination_addr
)) {
152 r
= netlink_message_append_in_addr_union(req
, NDA_DST
, fdb_entry
->family
, &fdb_entry
->destination_addr
);
154 return log_link_error_errno(link
, r
, "Could not append NDA_DST attribute: %m");
157 if (fdb_entry
->vni
<= VXLAN_VID_MAX
) {
158 r
= sd_netlink_message_append_u32(req
, NDA_VNI
, fdb_entry
->vni
);
160 return log_link_error_errno(link
, r
, "Could not append NDA_VNI attribute: %m");
163 /* send message to the kernel to update its internal static MAC table. */
164 r
= netlink_call_async(link
->manager
->rtnl
, NULL
, req
, set_fdb_handler
,
165 link_netlink_destroy_callback
, link
);
167 return log_link_error_errno(link
, r
, "Could not send rtnetlink message: %m");
174 /* remove and FDB entry. */
175 void fdb_entry_free(FdbEntry
*fdb_entry
) {
179 if (fdb_entry
->network
) {
180 LIST_REMOVE(static_fdb_entries
, fdb_entry
->network
->static_fdb_entries
, fdb_entry
);
181 assert(fdb_entry
->network
->n_static_fdb_entries
> 0);
182 fdb_entry
->network
->n_static_fdb_entries
--;
184 if (fdb_entry
->section
)
185 hashmap_remove(fdb_entry
->network
->fdb_entries_by_section
, fdb_entry
->section
);
188 network_config_section_free(fdb_entry
->section
);
192 /* parse the HW address from config files. */
193 int config_parse_fdb_hwaddr(
195 const char *filename
,
198 unsigned section_line
,
205 Network
*network
= userdata
;
206 _cleanup_(fdb_entry_free_or_set_invalidp
) FdbEntry
*fdb_entry
= NULL
;
215 r
= fdb_entry_new_static(network
, filename
, section_line
, &fdb_entry
);
219 r
= ether_addr_from_string(rvalue
, &fdb_entry
->mac_addr
);
221 log_syntax(unit
, LOG_WARNING
, filename
, line
, r
, "Not a valid MAC address, ignoring assignment: %s", rvalue
);
230 /* parse the VLAN Id from config files. */
231 int config_parse_fdb_vlan_id(
233 const char *filename
,
236 unsigned section_line
,
243 Network
*network
= userdata
;
244 _cleanup_(fdb_entry_free_or_set_invalidp
) FdbEntry
*fdb_entry
= NULL
;
253 r
= fdb_entry_new_static(network
, filename
, section_line
, &fdb_entry
);
257 r
= config_parse_vlanid(unit
, filename
, line
, section
,
258 section_line
, lvalue
, ltype
,
259 rvalue
, &fdb_entry
->vlan_id
, userdata
);
268 int config_parse_fdb_destination(
270 const char *filename
,
273 unsigned section_line
,
280 _cleanup_(fdb_entry_free_or_set_invalidp
) FdbEntry
*fdb_entry
= NULL
;
281 Network
*network
= userdata
;
290 r
= fdb_entry_new_static(network
, filename
, section_line
, &fdb_entry
);
294 r
= in_addr_from_string_auto(rvalue
, &fdb_entry
->family
, &fdb_entry
->destination_addr
);
296 return log_syntax(unit
, LOG_WARNING
, filename
, line
, r
,
297 "FDB destination IP address is invalid, ignoring assignment: %s",
305 int config_parse_fdb_vxlan_vni(
307 const char *filename
,
310 unsigned section_line
,
317 _cleanup_(fdb_entry_free_or_set_invalidp
) FdbEntry
*fdb_entry
= NULL
;
318 Network
*network
= userdata
;
328 r
= fdb_entry_new_static(network
, filename
, section_line
, &fdb_entry
);
332 r
= safe_atou32(rvalue
, &vni
);
334 log_syntax(unit
, LOG_WARNING
, filename
, line
, r
,
335 "Failed to parse VXLAN Network Identifier (VNI), ignoring assignment: %s",
340 if (vni
> VXLAN_VID_MAX
) {
341 log_syntax(unit
, LOG_WARNING
, filename
, line
, 0,
342 "FDB invalid VXLAN Network Identifier (VNI), ignoring assignment: %s",
347 fdb_entry
->vni
= vni
;
353 int config_parse_fdb_ntf_flags(
355 const char *filename
,
358 unsigned section_line
,
365 _cleanup_(fdb_entry_free_or_set_invalidp
) FdbEntry
*fdb_entry
= NULL
;
366 Network
*network
= userdata
;
367 NeighborCacheEntryFlags f
;
376 r
= fdb_entry_new_static(network
, filename
, section_line
, &fdb_entry
);
380 f
= fdb_ntf_flags_from_string(rvalue
);
382 log_syntax(unit
, LOG_WARNING
, filename
, line
, SYNTHETIC_ERRNO(EINVAL
),
383 "FDB failed to parse AssociatedWith=, ignoring assignment: %s",
388 fdb_entry
->fdb_ntf_flags
= f
;