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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
b98b483b AR |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright (C) 2014 Intel Corporation. All rights reserved. | |
6 | ||
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. | |
11 | ||
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. | |
16 | ||
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/>. | |
19 | ***/ | |
20 | ||
b98b483b | 21 | #include <net/ethernet.h> |
cf0fbc49 | 22 | #include <net/if.h> |
b98b483b | 23 | |
b5efdb8a | 24 | #include "alloc-util.h" |
b98b483b | 25 | #include "conf-parser.h" |
23f53b99 | 26 | #include "netdev/bridge.h" |
fc2f9534 | 27 | #include "netlink-util.h" |
fc2f9534 | 28 | #include "networkd-fdb.h" |
23f53b99 | 29 | #include "networkd-manager.h" |
b5efdb8a | 30 | #include "util.h" |
0e83e7a5 | 31 | #include "vlan-util.h" |
b98b483b | 32 | |
8c34b963 LP |
33 | #define STATIC_FDB_ENTRIES_PER_NETWORK_MAX 1024U |
34 | ||
b98b483b | 35 | /* create a new FDB entry or get an existing one. */ |
8c34b963 LP |
36 | int fdb_entry_new_static( |
37 | Network *network, | |
a60a720c | 38 | unsigned section, |
8c34b963 LP |
39 | FdbEntry **ret) { |
40 | ||
b98b483b AR |
41 | _cleanup_fdbentry_free_ FdbEntry *fdb_entry = NULL; |
42 | struct ether_addr *mac_addr = NULL; | |
43 | ||
44 | assert(network); | |
8c34b963 | 45 | assert(ret); |
b98b483b AR |
46 | |
47 | /* search entry in hashmap first. */ | |
9ed794a3 | 48 | if (section) { |
b98b483b AR |
49 | fdb_entry = hashmap_get(network->fdb_entries_by_section, UINT_TO_PTR(section)); |
50 | if (fdb_entry) { | |
51 | *ret = fdb_entry; | |
52 | fdb_entry = NULL; | |
53 | ||
54 | return 0; | |
55 | } | |
56 | } | |
57 | ||
8c34b963 LP |
58 | if (network->n_static_fdb_entries >= STATIC_FDB_ENTRIES_PER_NETWORK_MAX) |
59 | return -E2BIG; | |
60 | ||
b98b483b AR |
61 | /* allocate space for MAC address. */ |
62 | mac_addr = new0(struct ether_addr, 1); | |
63 | if (!mac_addr) | |
64 | return -ENOMEM; | |
65 | ||
66 | /* allocate space for and FDB entry. */ | |
67 | fdb_entry = new0(FdbEntry, 1); | |
b98b483b AR |
68 | if (!fdb_entry) { |
69 | /* free previously allocated space for mac_addr. */ | |
70 | free(mac_addr); | |
71 | return -ENOMEM; | |
72 | } | |
73 | ||
74 | /* init FDB structure. */ | |
75 | fdb_entry->network = network; | |
76 | fdb_entry->mac_addr = mac_addr; | |
77 | ||
78 | LIST_PREPEND(static_fdb_entries, network->static_fdb_entries, fdb_entry); | |
8c34b963 | 79 | network->n_static_fdb_entries++; |
b98b483b AR |
80 | |
81 | if (section) { | |
82 | fdb_entry->section = section; | |
83 | hashmap_put(network->fdb_entries_by_section, | |
84 | UINT_TO_PTR(fdb_entry->section), fdb_entry); | |
85 | } | |
86 | ||
87 | /* return allocated FDB structure. */ | |
88 | *ret = fdb_entry; | |
89 | fdb_entry = NULL; | |
90 | ||
91 | return 0; | |
92 | } | |
93 | ||
1c4baffc | 94 | static int set_fdb_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) { |
ea6ec096 | 95 | Link *link = userdata; |
b98b483b AR |
96 | int r; |
97 | ||
ea6ec096 | 98 | assert(link); |
b98b483b | 99 | |
1c4baffc | 100 | r = sd_netlink_message_get_errno(m); |
ea6ec096 | 101 | if (r < 0 && r != -EEXIST) |
6a7a4e4d | 102 | log_link_error_errno(link, r, "Could not add FDB entry: %m"); |
b98b483b AR |
103 | |
104 | return 1; | |
105 | } | |
106 | ||
107 | /* send a request to the kernel to add a FDB entry in its static MAC table. */ | |
a60a720c | 108 | int fdb_entry_configure(Link *link, FdbEntry *fdb_entry) { |
4afd3348 | 109 | _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL; |
1c4baffc | 110 | sd_netlink *rtnl; |
b98b483b | 111 | int r; |
f6bb7ac5 TJ |
112 | uint8_t flags; |
113 | Bridge *bridge; | |
b98b483b | 114 | |
ea6ec096 | 115 | assert(link); |
f6bb7ac5 | 116 | assert(link->network); |
ea6ec096 | 117 | assert(link->manager); |
b98b483b | 118 | assert(fdb_entry); |
ea6ec096 TG |
119 | |
120 | rtnl = link->manager->rtnl; | |
f6bb7ac5 | 121 | bridge = BRIDGE(link->network->bridge); |
b98b483b AR |
122 | |
123 | /* create new RTM message */ | |
ea6ec096 | 124 | r = sd_rtnl_message_new_neigh(rtnl, &req, RTM_NEWNEIGH, link->ifindex, PF_BRIDGE); |
b98b483b AR |
125 | if (r < 0) |
126 | return rtnl_log_create_error(r); | |
127 | ||
f6bb7ac5 TJ |
128 | if (bridge) |
129 | flags = NTF_MASTER; | |
130 | else | |
131 | flags = NTF_SELF; | |
132 | ||
133 | r = sd_rtnl_message_neigh_set_flags(req, flags); | |
b98b483b AR |
134 | if (r < 0) |
135 | return rtnl_log_create_error(r); | |
136 | ||
137 | /* only NUD_PERMANENT state supported. */ | |
138 | r = sd_rtnl_message_neigh_set_state(req, NUD_NOARP | NUD_PERMANENT); | |
139 | if (r < 0) | |
140 | return rtnl_log_create_error(r); | |
141 | ||
1c4baffc | 142 | r = sd_netlink_message_append_ether_addr(req, NDA_LLADDR, fdb_entry->mac_addr); |
b98b483b AR |
143 | if (r < 0) |
144 | return rtnl_log_create_error(r); | |
145 | ||
146 | /* VLAN Id is optional. We'll add VLAN Id only if it's specified. */ | |
147 | if (0 != fdb_entry->vlan_id) { | |
1c4baffc | 148 | r = sd_netlink_message_append_u16(req, NDA_VLAN, fdb_entry->vlan_id); |
b98b483b AR |
149 | if (r < 0) |
150 | return rtnl_log_create_error(r); | |
151 | } | |
152 | ||
153 | /* send message to the kernel to update its internal static MAC table. */ | |
1c4baffc | 154 | r = sd_netlink_call_async(rtnl, req, set_fdb_handler, link, 0, NULL); |
6a7a4e4d LP |
155 | if (r < 0) |
156 | return log_link_error_errno(link, r, "Could not send rtnetlink message: %m"); | |
b98b483b AR |
157 | |
158 | return 0; | |
159 | } | |
160 | ||
161 | /* remove and FDB entry. */ | |
162 | void fdb_entry_free(FdbEntry *fdb_entry) { | |
9ed794a3 | 163 | if (!fdb_entry) |
b98b483b AR |
164 | return; |
165 | ||
9ed794a3 | 166 | if (fdb_entry->network) { |
8c34b963 LP |
167 | LIST_REMOVE(static_fdb_entries, fdb_entry->network->static_fdb_entries, fdb_entry); |
168 | ||
169 | assert(fdb_entry->network->n_static_fdb_entries > 0); | |
170 | fdb_entry->network->n_static_fdb_entries--; | |
b98b483b | 171 | |
8519d8f5 | 172 | if (fdb_entry->section) |
8c34b963 | 173 | hashmap_remove(fdb_entry->network->fdb_entries_by_section, UINT_TO_PTR(fdb_entry->section)); |
b98b483b AR |
174 | } |
175 | ||
176 | free(fdb_entry->mac_addr); | |
177 | ||
178 | free(fdb_entry); | |
179 | } | |
180 | ||
181 | /* parse the HW address from config files. */ | |
8519d8f5 LP |
182 | int config_parse_fdb_hwaddr( |
183 | const char *unit, | |
184 | const char *filename, | |
185 | unsigned line, | |
186 | const char *section, | |
187 | unsigned section_line, | |
188 | const char *lvalue, | |
189 | int ltype, | |
190 | const char *rvalue, | |
191 | void *data, | |
192 | void *userdata) { | |
193 | ||
b98b483b AR |
194 | Network *network = userdata; |
195 | _cleanup_fdbentry_free_ FdbEntry *fdb_entry = NULL; | |
196 | int r; | |
197 | ||
198 | assert(filename); | |
199 | assert(section); | |
200 | assert(lvalue); | |
201 | assert(rvalue); | |
202 | assert(data); | |
203 | ||
204 | r = fdb_entry_new_static(network, section_line, &fdb_entry); | |
6a7a4e4d LP |
205 | if (r < 0) |
206 | return log_oom(); | |
b98b483b AR |
207 | |
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]); | |
216 | ||
8519d8f5 | 217 | if (ETHER_ADDR_LEN != r) { |
12ca818f | 218 | log_syntax(unit, LOG_ERR, filename, line, 0, "Not a valid MAC address, ignoring assignment: %s", rvalue); |
b98b483b AR |
219 | return 0; |
220 | } | |
221 | ||
222 | fdb_entry = NULL; | |
223 | ||
224 | return 0; | |
225 | } | |
226 | ||
227 | /* parse the VLAN Id from config files. */ | |
8519d8f5 LP |
228 | int config_parse_fdb_vlan_id( |
229 | const char *unit, | |
230 | const char *filename, | |
231 | unsigned line, | |
232 | const char *section, | |
233 | unsigned section_line, | |
234 | const char *lvalue, | |
235 | int ltype, | |
236 | const char *rvalue, | |
237 | void *data, | |
238 | void *userdata) { | |
239 | ||
b98b483b AR |
240 | Network *network = userdata; |
241 | _cleanup_fdbentry_free_ FdbEntry *fdb_entry = NULL; | |
242 | int r; | |
243 | ||
244 | assert(filename); | |
245 | assert(section); | |
246 | assert(lvalue); | |
247 | assert(rvalue); | |
248 | assert(data); | |
249 | ||
250 | r = fdb_entry_new_static(network, section_line, &fdb_entry); | |
6a7a4e4d LP |
251 | if (r < 0) |
252 | return log_oom(); | |
b98b483b | 253 | |
0e83e7a5 TJ |
254 | r = config_parse_vlanid(unit, filename, line, section, |
255 | section_line, lvalue, ltype, | |
256 | rvalue, &fdb_entry->vlan_id, userdata); | |
6a7a4e4d | 257 | if (r < 0) |
b98b483b | 258 | return r; |
b98b483b AR |
259 | |
260 | fdb_entry = NULL; | |
261 | ||
262 | return 0; | |
263 | } |