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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) { |
74b2466e LP |
136 | _cleanup_free_ struct in_addr *nameservers = NULL; |
137 | _cleanup_free_ struct in6_addr *nameservers6 = NULL; | |
138 | DnsServer *s, *nx; | |
a2ba62c7 | 139 | int r, n, i; |
74b2466e LP |
140 | |
141 | assert(l); | |
142 | ||
6073b6f2 | 143 | LIST_FOREACH(servers, s, l->dns_servers) |
74b2466e LP |
144 | s->marked = true; |
145 | ||
a2ba62c7 LP |
146 | n = sd_network_get_dns(l->ifindex, &nameservers); |
147 | if (n < 0) { | |
148 | r = n; | |
74b2466e | 149 | goto clear; |
a2ba62c7 | 150 | } |
74b2466e LP |
151 | |
152 | for (i = 0; i < n; i++) { | |
153 | union in_addr_union a = { .in = nameservers[i] }; | |
154 | ||
6073b6f2 | 155 | s = link_find_dns_server(l, AF_INET, &a); |
74b2466e LP |
156 | if (s) |
157 | s->marked = false; | |
158 | else { | |
6073b6f2 | 159 | r = dns_server_new(l->manager, NULL, l, AF_INET, &a); |
74b2466e LP |
160 | if (r < 0) |
161 | goto clear; | |
162 | } | |
163 | } | |
164 | ||
a2ba62c7 LP |
165 | n = sd_network_get_dns6(l->ifindex, &nameservers6); |
166 | if (n < 0) { | |
167 | r = n; | |
74b2466e | 168 | goto clear; |
a2ba62c7 | 169 | } |
74b2466e LP |
170 | |
171 | for (i = 0; i < n; i++) { | |
172 | union in_addr_union a = { .in6 = nameservers6[i] }; | |
173 | ||
6073b6f2 | 174 | s = link_find_dns_server(l, AF_INET6, &a); |
74b2466e LP |
175 | if (s) |
176 | s->marked = false; | |
177 | else { | |
6073b6f2 | 178 | r = dns_server_new(l->manager, NULL, l, AF_INET6, &a); |
74b2466e LP |
179 | if (r < 0) |
180 | goto clear; | |
181 | } | |
182 | } | |
183 | ||
6073b6f2 | 184 | LIST_FOREACH_SAFE(servers, s, nx, l->dns_servers) |
74b2466e LP |
185 | if (s->marked) |
186 | dns_server_free(s); | |
187 | ||
188 | return 0; | |
189 | ||
190 | clear: | |
6073b6f2 TG |
191 | while (l->dns_servers) |
192 | dns_server_free(l->dns_servers); | |
74b2466e LP |
193 | |
194 | return r; | |
195 | } | |
196 | ||
197 | int link_update_monitor(Link *l) { | |
198 | assert(l); | |
199 | ||
6073b6f2 | 200 | link_update_dns_servers(l); |
1716f6dc | 201 | link_allocate_scopes(l); |
74b2466e LP |
202 | |
203 | return 0; | |
204 | } | |
205 | ||
0dd25fb9 | 206 | bool link_relevant(Link *l, int family) { |
1716f6dc | 207 | _cleanup_free_ char *state = NULL; |
74b2466e LP |
208 | LinkAddress *a; |
209 | ||
210 | assert(l); | |
211 | ||
212 | /* A link is relevant if it isn't a loopback device and has at | |
213 | * least one relevant IP address */ | |
214 | ||
215 | if (l->flags & IFF_LOOPBACK) | |
216 | return false; | |
217 | ||
1716f6dc LP |
218 | sd_network_get_link_operational_state(l->ifindex, &state); |
219 | if (state && !STR_IN_SET(state, "unknown", "degraded", "routable")) | |
74b2466e LP |
220 | return false; |
221 | ||
222 | LIST_FOREACH(addresses, a, l->addresses) | |
1716f6dc | 223 | if (a->family == family && link_address_relevant(a)) |
74b2466e LP |
224 | return true; |
225 | ||
226 | return false; | |
227 | } | |
228 | ||
0dd25fb9 | 229 | LinkAddress *link_find_address(Link *l, int family, union in_addr_union *in_addr) { |
74b2466e LP |
230 | LinkAddress *a; |
231 | ||
232 | assert(l); | |
233 | ||
1716f6dc LP |
234 | LIST_FOREACH(addresses, a, l->addresses) |
235 | if (a->family == family && in_addr_equal(family, &a->in_addr, in_addr)) | |
74b2466e | 236 | return a; |
74b2466e LP |
237 | |
238 | return NULL; | |
239 | } | |
240 | ||
6073b6f2 TG |
241 | DnsServer* link_find_dns_server(Link *l, int family, union in_addr_union *in_addr) { |
242 | DnsServer *s; | |
74b2466e LP |
243 | |
244 | assert(l); | |
245 | ||
6073b6f2 | 246 | LIST_FOREACH(servers, s, l->dns_servers) |
1716f6dc | 247 | if (s->family == family && in_addr_equal(family, &s->address, in_addr)) |
74b2466e | 248 | return s; |
74b2466e LP |
249 | |
250 | return NULL; | |
251 | } | |
252 | ||
253 | DnsServer *link_get_dns_server(Link *l) { | |
254 | assert(l); | |
255 | ||
256 | if (!l->current_dns_server) | |
6073b6f2 | 257 | l->current_dns_server = l->dns_servers; |
74b2466e LP |
258 | |
259 | return l->current_dns_server; | |
260 | } | |
261 | ||
262 | void link_next_dns_server(Link *l) { | |
263 | assert(l); | |
264 | ||
265 | /* Switch to the next DNS server */ | |
266 | ||
267 | if (!l->current_dns_server) { | |
6073b6f2 | 268 | l->current_dns_server = l->dns_servers; |
74b2466e LP |
269 | if (l->current_dns_server) |
270 | return; | |
271 | } | |
272 | ||
273 | if (!l->current_dns_server) | |
274 | return; | |
275 | ||
276 | if (l->current_dns_server->servers_next) { | |
277 | l->current_dns_server = l->current_dns_server->servers_next; | |
278 | return; | |
279 | } | |
280 | ||
6073b6f2 | 281 | l->current_dns_server = l->dns_servers; |
74b2466e LP |
282 | } |
283 | ||
0dd25fb9 | 284 | int link_address_new(Link *l, LinkAddress **ret, int family, union in_addr_union *in_addr) { |
74b2466e LP |
285 | LinkAddress *a; |
286 | ||
287 | assert(l); | |
288 | assert(in_addr); | |
289 | ||
290 | a = new0(LinkAddress, 1); | |
291 | if (!a) | |
292 | return -ENOMEM; | |
293 | ||
294 | a->family = family; | |
295 | a->in_addr = *in_addr; | |
296 | ||
297 | a->link = l; | |
298 | LIST_PREPEND(addresses, l->addresses, a); | |
299 | ||
300 | if (ret) | |
301 | *ret = a; | |
302 | ||
303 | return 0; | |
304 | } | |
305 | ||
306 | LinkAddress *link_address_free(LinkAddress *a) { | |
307 | if (!a) | |
308 | return NULL; | |
309 | ||
310 | if (a->link) | |
311 | LIST_REMOVE(addresses, a->link->addresses, a); | |
312 | ||
313 | free(a); | |
314 | return NULL; | |
315 | } | |
316 | ||
317 | int link_address_update_rtnl(LinkAddress *a, sd_rtnl_message *m) { | |
318 | int r; | |
319 | assert(a); | |
320 | assert(m); | |
321 | ||
322 | r = sd_rtnl_message_addr_get_flags(m, &a->flags); | |
323 | if (r < 0) | |
324 | return r; | |
325 | ||
1716f6dc | 326 | sd_rtnl_message_addr_get_scope(m, &a->scope); |
74b2466e | 327 | |
1716f6dc | 328 | link_allocate_scopes(a->link); |
74b2466e LP |
329 | return 0; |
330 | } | |
331 | ||
332 | bool link_address_relevant(LinkAddress *a) { | |
333 | assert(a); | |
334 | ||
335 | if (a->flags & IFA_F_DEPRECATED) | |
336 | return false; | |
337 | ||
338 | if (IN_SET(a->scope, RT_SCOPE_HOST, RT_SCOPE_NOWHERE)) | |
339 | return false; | |
340 | ||
341 | return true; | |
342 | } |