]>
Commit | Line | Data |
---|---|---|
74b2466e LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2014 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <net/if.h> | |
23 | ||
24 | #include "sd-network.h" | |
74b2466e LP |
25 | #include "strv.h" |
26 | #include "resolved-link.h" | |
27 | ||
28 | int link_new(Manager *m, Link **ret, int ifindex) { | |
29 | _cleanup_(link_freep) Link *l = NULL; | |
30 | int r; | |
31 | ||
32 | assert(m); | |
33 | assert(ifindex > 0); | |
34 | ||
35 | r = hashmap_ensure_allocated(&m->links, NULL, NULL); | |
36 | if (r < 0) | |
37 | return r; | |
38 | ||
39 | l = new0(Link, 1); | |
40 | if (!l) | |
41 | return -ENOMEM; | |
42 | ||
43 | l->ifindex = ifindex; | |
44 | ||
45 | r = hashmap_put(m->links, INT_TO_PTR(ifindex), l); | |
46 | if (r < 0) | |
47 | return r; | |
48 | ||
49 | l->manager = m; | |
50 | ||
51 | if (ret) | |
52 | *ret = l; | |
53 | l = NULL; | |
54 | ||
55 | return 0; | |
56 | } | |
57 | ||
58 | Link *link_free(Link *l) { | |
59 | ||
60 | if (!l) | |
61 | return NULL; | |
62 | ||
63 | while (l->addresses) | |
64 | link_address_free(l->addresses); | |
65 | ||
66 | if (l->manager) | |
67 | hashmap_remove(l->manager->links, INT_TO_PTR(l->ifindex)); | |
68 | ||
69 | dns_scope_free(l->unicast_scope); | |
1716f6dc LP |
70 | dns_scope_free(l->llmnr_ipv4_scope); |
71 | dns_scope_free(l->llmnr_ipv6_scope); | |
74b2466e | 72 | |
6073b6f2 TG |
73 | while (l->dns_servers) |
74 | dns_server_free(l->dns_servers); | |
74b2466e LP |
75 | |
76 | free(l); | |
77 | return NULL; | |
1716f6dc LP |
78 | } |
79 | ||
80 | static void link_allocate_scopes(Link *l) { | |
81 | int r; | |
82 | ||
83 | assert(l); | |
84 | ||
6073b6f2 | 85 | if (l->dns_servers) { |
1716f6dc LP |
86 | if (!l->unicast_scope) { |
87 | r = dns_scope_new(l->manager, &l->unicast_scope, l, DNS_PROTOCOL_DNS, AF_UNSPEC); | |
88 | if (r < 0) | |
89 | log_warning("Failed to allocate DNS scope: %s", strerror(-r)); | |
90 | } | |
91 | } else | |
92 | l->unicast_scope = dns_scope_free(l->unicast_scope); | |
93 | ||
94 | if (link_relevant(l, AF_INET) && l->manager->use_llmnr) { | |
95 | if (!l->llmnr_ipv4_scope) { | |
96 | r = dns_scope_new(l->manager, &l->llmnr_ipv4_scope, l, DNS_PROTOCOL_LLMNR, AF_INET); | |
97 | if (r < 0) | |
98 | log_warning("Failed to allocate LLMNR IPv4 scope: %s", strerror(-r)); | |
99 | } | |
100 | } else | |
101 | l->llmnr_ipv4_scope = dns_scope_free(l->llmnr_ipv4_scope); | |
102 | ||
103 | if (link_relevant(l, AF_INET6) && l->manager->use_llmnr) { | |
104 | if (!l->llmnr_ipv6_scope) { | |
105 | r = dns_scope_new(l->manager, &l->llmnr_ipv6_scope, l, DNS_PROTOCOL_LLMNR, AF_INET6); | |
106 | if (r < 0) | |
107 | log_warning("Failed to allocate LLMNR IPv6 scope: %s", strerror(-r)); | |
108 | } | |
109 | } else | |
110 | l->llmnr_ipv6_scope = dns_scope_free(l->llmnr_ipv6_scope); | |
111 | } | |
74b2466e LP |
112 | |
113 | int link_update_rtnl(Link *l, sd_rtnl_message *m) { | |
1716f6dc | 114 | const char *n = NULL; |
74b2466e LP |
115 | int r; |
116 | ||
117 | assert(l); | |
118 | assert(m); | |
119 | ||
120 | r = sd_rtnl_message_link_get_flags(m, &l->flags); | |
121 | if (r < 0) | |
122 | return r; | |
123 | ||
c5ed9316 | 124 | sd_rtnl_message_read_u32(m, IFLA_MTU, &l->mtu); |
1716f6dc LP |
125 | |
126 | if (sd_rtnl_message_read_string(m, IFLA_IFNAME, &n) >= 0) { | |
127 | strncpy(l->name, n, sizeof(l->name)); | |
128 | char_array_0(l->name); | |
129 | } | |
130 | ||
131 | link_allocate_scopes(l); | |
74b2466e LP |
132 | return 0; |
133 | } | |
134 | ||
6073b6f2 | 135 | static int link_update_dns_servers(Link *l) { |
6f4dedb2 TG |
136 | _cleanup_strv_free_ char **nameservers = NULL; |
137 | char **nameserver; | |
74b2466e | 138 | DnsServer *s, *nx; |
6f4dedb2 | 139 | int r; |
74b2466e LP |
140 | |
141 | assert(l); | |
142 | ||
6073b6f2 | 143 | LIST_FOREACH(servers, s, l->dns_servers) |
74b2466e LP |
144 | s->marked = true; |
145 | ||
6f4dedb2 TG |
146 | r = sd_network_get_dns(l->ifindex, &nameservers); |
147 | if (r < 0) | |
74b2466e | 148 | goto clear; |
74b2466e | 149 | |
6f4dedb2 TG |
150 | STRV_FOREACH(nameserver, nameservers) { |
151 | union in_addr_union a; | |
152 | int family; | |
74b2466e | 153 | |
6f4dedb2 TG |
154 | r = in_addr_from_string_auto(*nameserver, &family, &a); |
155 | if (r < 0) | |
156 | goto clear; | |
74b2466e | 157 | |
6f4dedb2 | 158 | s = link_find_dns_server(l, family, &a); |
74b2466e LP |
159 | if (s) |
160 | s->marked = false; | |
161 | else { | |
6f4dedb2 | 162 | r = dns_server_new(l->manager, NULL, l, family, &a); |
74b2466e LP |
163 | if (r < 0) |
164 | goto clear; | |
165 | } | |
166 | } | |
167 | ||
6073b6f2 | 168 | LIST_FOREACH_SAFE(servers, s, nx, l->dns_servers) |
74b2466e LP |
169 | if (s->marked) |
170 | dns_server_free(s); | |
171 | ||
172 | return 0; | |
173 | ||
174 | clear: | |
6073b6f2 TG |
175 | while (l->dns_servers) |
176 | dns_server_free(l->dns_servers); | |
74b2466e LP |
177 | |
178 | return r; | |
179 | } | |
180 | ||
181 | int link_update_monitor(Link *l) { | |
182 | assert(l); | |
183 | ||
6073b6f2 | 184 | link_update_dns_servers(l); |
1716f6dc | 185 | link_allocate_scopes(l); |
74b2466e LP |
186 | |
187 | return 0; | |
188 | } | |
189 | ||
0dd25fb9 | 190 | bool link_relevant(Link *l, int family) { |
1716f6dc | 191 | _cleanup_free_ char *state = NULL; |
74b2466e LP |
192 | LinkAddress *a; |
193 | ||
194 | assert(l); | |
195 | ||
196 | /* A link is relevant if it isn't a loopback device and has at | |
197 | * least one relevant IP address */ | |
198 | ||
199 | if (l->flags & IFF_LOOPBACK) | |
200 | return false; | |
201 | ||
1716f6dc LP |
202 | sd_network_get_link_operational_state(l->ifindex, &state); |
203 | if (state && !STR_IN_SET(state, "unknown", "degraded", "routable")) | |
74b2466e LP |
204 | return false; |
205 | ||
206 | LIST_FOREACH(addresses, a, l->addresses) | |
1716f6dc | 207 | if (a->family == family && link_address_relevant(a)) |
74b2466e LP |
208 | return true; |
209 | ||
210 | return false; | |
211 | } | |
212 | ||
0dd25fb9 | 213 | LinkAddress *link_find_address(Link *l, int family, union in_addr_union *in_addr) { |
74b2466e LP |
214 | LinkAddress *a; |
215 | ||
216 | assert(l); | |
217 | ||
1716f6dc LP |
218 | LIST_FOREACH(addresses, a, l->addresses) |
219 | if (a->family == family && in_addr_equal(family, &a->in_addr, in_addr)) | |
74b2466e | 220 | return a; |
74b2466e LP |
221 | |
222 | return NULL; | |
223 | } | |
224 | ||
6073b6f2 TG |
225 | DnsServer* link_find_dns_server(Link *l, int family, union in_addr_union *in_addr) { |
226 | DnsServer *s; | |
74b2466e LP |
227 | |
228 | assert(l); | |
229 | ||
6073b6f2 | 230 | LIST_FOREACH(servers, s, l->dns_servers) |
1716f6dc | 231 | if (s->family == family && in_addr_equal(family, &s->address, in_addr)) |
74b2466e | 232 | return s; |
74b2466e LP |
233 | |
234 | return NULL; | |
235 | } | |
236 | ||
237 | DnsServer *link_get_dns_server(Link *l) { | |
238 | assert(l); | |
239 | ||
240 | if (!l->current_dns_server) | |
6073b6f2 | 241 | l->current_dns_server = l->dns_servers; |
74b2466e LP |
242 | |
243 | return l->current_dns_server; | |
244 | } | |
245 | ||
246 | void link_next_dns_server(Link *l) { | |
247 | assert(l); | |
248 | ||
249 | /* Switch to the next DNS server */ | |
250 | ||
251 | if (!l->current_dns_server) { | |
6073b6f2 | 252 | l->current_dns_server = l->dns_servers; |
74b2466e LP |
253 | if (l->current_dns_server) |
254 | return; | |
255 | } | |
256 | ||
257 | if (!l->current_dns_server) | |
258 | return; | |
259 | ||
260 | if (l->current_dns_server->servers_next) { | |
261 | l->current_dns_server = l->current_dns_server->servers_next; | |
262 | return; | |
263 | } | |
264 | ||
6073b6f2 | 265 | l->current_dns_server = l->dns_servers; |
74b2466e LP |
266 | } |
267 | ||
0dd25fb9 | 268 | int link_address_new(Link *l, LinkAddress **ret, int family, union in_addr_union *in_addr) { |
74b2466e LP |
269 | LinkAddress *a; |
270 | ||
271 | assert(l); | |
272 | assert(in_addr); | |
273 | ||
274 | a = new0(LinkAddress, 1); | |
275 | if (!a) | |
276 | return -ENOMEM; | |
277 | ||
278 | a->family = family; | |
279 | a->in_addr = *in_addr; | |
280 | ||
281 | a->link = l; | |
282 | LIST_PREPEND(addresses, l->addresses, a); | |
283 | ||
284 | if (ret) | |
285 | *ret = a; | |
286 | ||
287 | return 0; | |
288 | } | |
289 | ||
290 | LinkAddress *link_address_free(LinkAddress *a) { | |
291 | if (!a) | |
292 | return NULL; | |
293 | ||
294 | if (a->link) | |
295 | LIST_REMOVE(addresses, a->link->addresses, a); | |
296 | ||
297 | free(a); | |
298 | return NULL; | |
299 | } | |
300 | ||
301 | int link_address_update_rtnl(LinkAddress *a, sd_rtnl_message *m) { | |
302 | int r; | |
303 | assert(a); | |
304 | assert(m); | |
305 | ||
306 | r = sd_rtnl_message_addr_get_flags(m, &a->flags); | |
307 | if (r < 0) | |
308 | return r; | |
309 | ||
1716f6dc | 310 | sd_rtnl_message_addr_get_scope(m, &a->scope); |
74b2466e | 311 | |
1716f6dc | 312 | link_allocate_scopes(a->link); |
74b2466e LP |
313 | return 0; |
314 | } | |
315 | ||
316 | bool link_address_relevant(LinkAddress *a) { | |
317 | assert(a); | |
318 | ||
319 | if (a->flags & IFA_F_DEPRECATED) | |
320 | return false; | |
321 | ||
322 | if (IN_SET(a->scope, RT_SCOPE_HOST, RT_SCOPE_NOWHERE)) | |
323 | return false; | |
324 | ||
325 | return true; | |
326 | } |