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8041b5ba LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
cbc06dcd | 4 | This file is part of systemd. |
8041b5ba LP |
5 | |
6 | Copyright 2008-2011 Lennart Poettering | |
d1ca51b1 | 7 | Copyright 2014 Tom Gundersen |
8041b5ba | 8 | |
cbc06dcd TG |
9 | systemd is free software; you can redistribute it and/or modify it |
10 | under the terms of the GNU Lesser General Public License as published by | |
11 | the Free Software Foundation; either version 2.1 of the License, or | |
12 | (at your option) any later version. | |
8041b5ba | 13 | |
cbc06dcd TG |
14 | systemd is distributed in the hope that it will be useful, but |
15 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
8041b5ba LP |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
17 | Lesser General Public License for more details. | |
18 | ||
cbc06dcd TG |
19 | You should have received a copy of the GNU Lesser General Public License |
20 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
8041b5ba LP |
21 | ***/ |
22 | ||
d1ca51b1 TG |
23 | #include "sd-rtnl.h" |
24 | #include "rtnl-util.h" | |
25 | #include "macro.h" | |
e80af1bd | 26 | #include "local-addresses.h" |
8041b5ba | 27 | |
5502f0d9 | 28 | static int address_compare(const void *_a, const void *_b) { |
e80af1bd | 29 | const struct local_address *a = _a, *b = _b; |
5502f0d9 LP |
30 | |
31 | /* Order lowest scope first, IPv4 before IPv6, lowest interface index first */ | |
32 | ||
e9140aff LP |
33 | if (a->family == AF_INET && b->family == AF_INET6) |
34 | return -1; | |
35 | if (a->family == AF_INET6 && b->family == AF_INET) | |
36 | return 1; | |
37 | ||
5502f0d9 LP |
38 | if (a->scope < b->scope) |
39 | return -1; | |
40 | if (a->scope > b->scope) | |
41 | return 1; | |
42 | ||
e9140aff | 43 | if (a->metric < b->metric) |
5502f0d9 | 44 | return -1; |
e9140aff | 45 | if (a->metric > b->metric) |
5502f0d9 LP |
46 | return 1; |
47 | ||
48 | if (a->ifindex < b->ifindex) | |
49 | return -1; | |
50 | if (a->ifindex > b->ifindex) | |
51 | return 1; | |
52 | ||
53 | return 0; | |
54 | } | |
55 | ||
1d050e1e | 56 | int local_addresses(sd_rtnl *context, int ifindex, int af, struct local_address **ret) { |
d1ca51b1 | 57 | _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL, *reply = NULL; |
5502f0d9 | 58 | _cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL; |
e80af1bd | 59 | _cleanup_free_ struct local_address *list = NULL; |
5502f0d9 LP |
60 | size_t n_list = 0, n_allocated = 0; |
61 | sd_rtnl_message *m; | |
d1ca51b1 | 62 | int r; |
d73c3269 | 63 | |
e80af1bd LP |
64 | assert(ret); |
65 | ||
ee8c4568 LP |
66 | if (context) |
67 | rtnl = sd_rtnl_ref(context); | |
68 | else { | |
69 | r = sd_rtnl_open(&rtnl, 0); | |
70 | if (r < 0) | |
71 | return r; | |
72 | } | |
8041b5ba | 73 | |
1d050e1e | 74 | r = sd_rtnl_message_new_addr(rtnl, &req, RTM_GETADDR, 0, af); |
d1ca51b1 TG |
75 | if (r < 0) |
76 | return r; | |
8041b5ba | 77 | |
d1ca51b1 TG |
78 | r = sd_rtnl_call(rtnl, req, 0, &reply); |
79 | if (r < 0) | |
80 | return r; | |
d1ca51b1 | 81 | |
5502f0d9 | 82 | for (m = reply; m; m = sd_rtnl_message_next(m)) { |
e80af1bd | 83 | struct local_address *a; |
d1ca51b1 | 84 | unsigned char flags; |
5502f0d9 | 85 | uint16_t type; |
1d050e1e | 86 | int ifi, family; |
d1ca51b1 TG |
87 | |
88 | r = sd_rtnl_message_get_errno(m); | |
89 | if (r < 0) | |
90 | return r; | |
91 | ||
92 | r = sd_rtnl_message_get_type(m, &type); | |
93 | if (r < 0) | |
94 | return r; | |
d1ca51b1 | 95 | if (type != RTM_NEWADDR) |
8041b5ba LP |
96 | continue; |
97 | ||
ee8c4568 LP |
98 | r = sd_rtnl_message_addr_get_ifindex(m, &ifi); |
99 | if (r < 0) | |
100 | return r; | |
1d050e1e LP |
101 | if (ifindex > 0 && ifi != ifindex) |
102 | continue; | |
ee8c4568 | 103 | |
1d050e1e LP |
104 | r = sd_rtnl_message_addr_get_family(m, &family); |
105 | if (r < 0) | |
106 | return r; | |
107 | if (af != AF_UNSPEC && af != family) | |
ee8c4568 LP |
108 | continue; |
109 | ||
5502f0d9 | 110 | r = sd_rtnl_message_addr_get_flags(m, &flags); |
d1ca51b1 TG |
111 | if (r < 0) |
112 | return r; | |
5502f0d9 | 113 | if (flags & IFA_F_DEPRECATED) |
d73c3269 | 114 | continue; |
8041b5ba | 115 | |
e9140aff | 116 | if (!GREEDY_REALLOC0(list, n_allocated, n_list+1)) |
5502f0d9 LP |
117 | return -ENOMEM; |
118 | ||
119 | a = list + n_list; | |
120 | ||
121 | r = sd_rtnl_message_addr_get_scope(m, &a->scope); | |
d1ca51b1 TG |
122 | if (r < 0) |
123 | return r; | |
8041b5ba | 124 | |
ee8c4568 | 125 | if (ifindex == 0 && (a->scope == RT_SCOPE_HOST || a->scope == RT_SCOPE_NOWHERE)) |
d73c3269 | 126 | continue; |
8041b5ba | 127 | |
1d050e1e | 128 | switch (family) { |
5502f0d9 | 129 | |
d1ca51b1 | 130 | case AF_INET: |
5502f0d9 | 131 | r = sd_rtnl_message_read_in_addr(m, IFA_LOCAL, &a->address.in); |
d1ca51b1 | 132 | if (r < 0) { |
5502f0d9 | 133 | r = sd_rtnl_message_read_in_addr(m, IFA_ADDRESS, &a->address.in); |
d1ca51b1 TG |
134 | if (r < 0) |
135 | continue; | |
136 | } | |
137 | break; | |
5502f0d9 | 138 | |
d1ca51b1 | 139 | case AF_INET6: |
5502f0d9 | 140 | r = sd_rtnl_message_read_in6_addr(m, IFA_LOCAL, &a->address.in6); |
d1ca51b1 | 141 | if (r < 0) { |
5502f0d9 | 142 | r = sd_rtnl_message_read_in6_addr(m, IFA_ADDRESS, &a->address.in6); |
d1ca51b1 TG |
143 | if (r < 0) |
144 | continue; | |
145 | } | |
146 | break; | |
5502f0d9 | 147 | |
d1ca51b1 | 148 | default: |
d73c3269 | 149 | continue; |
d73c3269 | 150 | } |
8041b5ba | 151 | |
ee8c4568 | 152 | a->ifindex = ifi; |
1d050e1e | 153 | a->family = family; |
8041b5ba | 154 | |
d1ca51b1 | 155 | n_list++; |
5502f0d9 | 156 | }; |
8041b5ba | 157 | |
e9140aff LP |
158 | if (n_list > 0) |
159 | qsort(list, n_list, sizeof(struct local_address), address_compare); | |
160 | ||
161 | *ret = list; | |
162 | list = NULL; | |
163 | ||
164 | return (int) n_list; | |
165 | } | |
166 | ||
1d050e1e | 167 | int local_gateways(sd_rtnl *context, int ifindex, int af, struct local_address **ret) { |
e9140aff LP |
168 | _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL, *reply = NULL; |
169 | _cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL; | |
170 | _cleanup_free_ struct local_address *list = NULL; | |
171 | sd_rtnl_message *m = NULL; | |
172 | size_t n_list = 0, n_allocated = 0; | |
173 | int r; | |
174 | ||
175 | assert(ret); | |
176 | ||
177 | if (context) | |
178 | rtnl = sd_rtnl_ref(context); | |
179 | else { | |
180 | r = sd_rtnl_open(&rtnl, 0); | |
181 | if (r < 0) | |
182 | return r; | |
183 | } | |
184 | ||
1d050e1e | 185 | r = sd_rtnl_message_new_route(rtnl, &req, RTM_GETROUTE, af, RTPROT_UNSPEC); |
e9140aff LP |
186 | if (r < 0) |
187 | return r; | |
188 | ||
189 | r = sd_rtnl_message_request_dump(req, true); | |
190 | if (r < 0) | |
191 | return r; | |
192 | ||
193 | r = sd_rtnl_call(rtnl, req, 0, &reply); | |
194 | if (r < 0) | |
195 | return r; | |
196 | ||
197 | for (m = reply; m; m = sd_rtnl_message_next(m)) { | |
198 | struct local_address *a; | |
199 | uint16_t type; | |
a98433c0 | 200 | unsigned char dst_len, src_len; |
e9140aff | 201 | uint32_t ifi; |
1d050e1e | 202 | int family; |
e9140aff LP |
203 | |
204 | r = sd_rtnl_message_get_errno(m); | |
205 | if (r < 0) | |
206 | return r; | |
207 | ||
208 | r = sd_rtnl_message_get_type(m, &type); | |
209 | if (r < 0) | |
210 | return r; | |
e9140aff LP |
211 | if (type != RTM_NEWROUTE) |
212 | continue; | |
213 | ||
a98433c0 | 214 | /* We only care for default routes */ |
e9140aff LP |
215 | r = sd_rtnl_message_route_get_dst_len(m, &dst_len); |
216 | if (r < 0) | |
217 | return r; | |
e9140aff LP |
218 | if (dst_len != 0) |
219 | continue; | |
220 | ||
a98433c0 LP |
221 | r = sd_rtnl_message_route_get_src_len(m, &src_len); |
222 | if (r < 0) | |
223 | return r; | |
224 | if (src_len != 0) | |
225 | continue; | |
226 | ||
e9140aff LP |
227 | r = sd_rtnl_message_read_u32(m, RTA_OIF, &ifi); |
228 | if (r < 0) | |
229 | return r; | |
e9140aff LP |
230 | if (ifindex > 0 && (int) ifi != ifindex) |
231 | continue; | |
232 | ||
1d050e1e LP |
233 | r = sd_rtnl_message_route_get_family(m, &family); |
234 | if (r < 0) | |
235 | return r; | |
236 | if (af != AF_UNSPEC && af != family) | |
237 | continue; | |
238 | ||
e9140aff LP |
239 | if (!GREEDY_REALLOC0(list, n_allocated, n_list + 1)) |
240 | return -ENOMEM; | |
241 | ||
242 | a = list + n_list; | |
243 | ||
1d050e1e | 244 | switch (family) { |
e9140aff LP |
245 | case AF_INET: |
246 | r = sd_rtnl_message_read_in_addr(m, RTA_GATEWAY, &a->address.in); | |
247 | if (r < 0) | |
248 | continue; | |
249 | ||
250 | break; | |
251 | case AF_INET6: | |
252 | r = sd_rtnl_message_read_in6_addr(m, RTA_GATEWAY, &a->address.in6); | |
253 | if (r < 0) | |
254 | continue; | |
255 | ||
256 | break; | |
257 | default: | |
258 | continue; | |
259 | } | |
260 | ||
261 | sd_rtnl_message_read_u32(m, RTA_PRIORITY, &a->metric); | |
262 | ||
263 | a->ifindex = ifi; | |
1d050e1e | 264 | a->family = family; |
e9140aff | 265 | |
1d050e1e | 266 | n_list++; |
e9140aff LP |
267 | } |
268 | ||
269 | if (n_list > 0) | |
e80af1bd | 270 | qsort(list, n_list, sizeof(struct local_address), address_compare); |
d73c3269 | 271 | |
e80af1bd | 272 | *ret = list; |
d1ca51b1 | 273 | list = NULL; |
d73c3269 | 274 | |
e80af1bd | 275 | return (int) n_list; |
8041b5ba | 276 | } |