1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
|
/***
This file is part of systemd.
Copyright 2008-2011 Lennart Poettering
Copyright 2014 Tom Gundersen
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <systemd/sd-netlink.h>
#include "alloc-util.h"
#include "local-addresses.h"
#include "macro.h"
#include "netlink-util.h"
static int address_compare(const void *_a, const void *_b) {
const struct local_address *a = _a, *b = _b;
/* Order lowest scope first, IPv4 before IPv6, lowest interface index first */
if (a->family == AF_INET && b->family == AF_INET6)
return -1;
if (a->family == AF_INET6 && b->family == AF_INET)
return 1;
if (a->scope < b->scope)
return -1;
if (a->scope > b->scope)
return 1;
if (a->metric < b->metric)
return -1;
if (a->metric > b->metric)
return 1;
if (a->ifindex < b->ifindex)
return -1;
if (a->ifindex > b->ifindex)
return 1;
return memcmp(&a->address, &b->address, FAMILY_ADDRESS_SIZE(a->family));
}
int local_addresses(sd_netlink *context, int ifindex, int af, struct local_address **ret) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
_cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
_cleanup_free_ struct local_address *list = NULL;
size_t n_list = 0, n_allocated = 0;
sd_netlink_message *m;
int r;
assert(ret);
if (context)
rtnl = sd_netlink_ref(context);
else {
r = sd_netlink_open(&rtnl);
if (r < 0)
return r;
}
r = sd_rtnl_message_new_addr(rtnl, &req, RTM_GETADDR, 0, af);
if (r < 0)
return r;
r = sd_netlink_call(rtnl, req, 0, &reply);
if (r < 0)
return r;
for (m = reply; m; m = sd_netlink_message_next(m)) {
struct local_address *a;
unsigned char flags;
uint16_t type;
int ifi, family;
r = sd_netlink_message_get_errno(m);
if (r < 0)
return r;
r = sd_netlink_message_get_type(m, &type);
if (r < 0)
return r;
if (type != RTM_NEWADDR)
continue;
r = sd_rtnl_message_addr_get_ifindex(m, &ifi);
if (r < 0)
return r;
if (ifindex > 0 && ifi != ifindex)
continue;
r = sd_rtnl_message_addr_get_family(m, &family);
if (r < 0)
return r;
if (af != AF_UNSPEC && af != family)
continue;
r = sd_rtnl_message_addr_get_flags(m, &flags);
if (r < 0)
return r;
if (flags & IFA_F_DEPRECATED)
continue;
if (!GREEDY_REALLOC0(list, n_allocated, n_list+1))
return -ENOMEM;
a = list + n_list;
r = sd_rtnl_message_addr_get_scope(m, &a->scope);
if (r < 0)
return r;
if (ifindex == 0 && (a->scope == RT_SCOPE_HOST || a->scope == RT_SCOPE_NOWHERE))
continue;
switch (family) {
case AF_INET:
r = sd_netlink_message_read_in_addr(m, IFA_LOCAL, &a->address.in);
if (r < 0) {
r = sd_netlink_message_read_in_addr(m, IFA_ADDRESS, &a->address.in);
if (r < 0)
continue;
}
break;
case AF_INET6:
r = sd_netlink_message_read_in6_addr(m, IFA_LOCAL, &a->address.in6);
if (r < 0) {
r = sd_netlink_message_read_in6_addr(m, IFA_ADDRESS, &a->address.in6);
if (r < 0)
continue;
}
break;
default:
continue;
}
a->ifindex = ifi;
a->family = family;
n_list++;
};
if (n_list > 0)
qsort(list, n_list, sizeof(struct local_address), address_compare);
*ret = list;
list = NULL;
return (int) n_list;
}
int local_gateways(sd_netlink *context, int ifindex, int af, struct local_address **ret) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
_cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
_cleanup_free_ struct local_address *list = NULL;
sd_netlink_message *m = NULL;
size_t n_list = 0, n_allocated = 0;
int r;
assert(ret);
if (context)
rtnl = sd_netlink_ref(context);
else {
r = sd_netlink_open(&rtnl);
if (r < 0)
return r;
}
r = sd_rtnl_message_new_route(rtnl, &req, RTM_GETROUTE, af, RTPROT_UNSPEC);
if (r < 0)
return r;
r = sd_netlink_message_request_dump(req, true);
if (r < 0)
return r;
r = sd_netlink_call(rtnl, req, 0, &reply);
if (r < 0)
return r;
for (m = reply; m; m = sd_netlink_message_next(m)) {
struct local_address *a;
uint16_t type;
unsigned char dst_len, src_len;
uint32_t ifi;
int family;
r = sd_netlink_message_get_errno(m);
if (r < 0)
return r;
r = sd_netlink_message_get_type(m, &type);
if (r < 0)
return r;
if (type != RTM_NEWROUTE)
continue;
/* We only care for default routes */
r = sd_rtnl_message_route_get_dst_prefixlen(m, &dst_len);
if (r < 0)
return r;
if (dst_len != 0)
continue;
r = sd_rtnl_message_route_get_src_prefixlen(m, &src_len);
if (r < 0)
return r;
if (src_len != 0)
continue;
r = sd_netlink_message_read_u32(m, RTA_OIF, &ifi);
if (r < 0)
return r;
if (ifindex > 0 && (int) ifi != ifindex)
continue;
r = sd_rtnl_message_route_get_family(m, &family);
if (r < 0)
return r;
if (af != AF_UNSPEC && af != family)
continue;
if (!GREEDY_REALLOC0(list, n_allocated, n_list + 1))
return -ENOMEM;
a = list + n_list;
switch (family) {
case AF_INET:
r = sd_netlink_message_read_in_addr(m, RTA_GATEWAY, &a->address.in);
if (r < 0)
continue;
break;
case AF_INET6:
r = sd_netlink_message_read_in6_addr(m, RTA_GATEWAY, &a->address.in6);
if (r < 0)
continue;
break;
default:
continue;
}
sd_netlink_message_read_u32(m, RTA_PRIORITY, &a->metric);
a->ifindex = ifi;
a->family = family;
n_list++;
}
if (n_list > 0)
qsort(list, n_list, sizeof(struct local_address), address_compare);
*ret = list;
list = NULL;
return (int) n_list;
}
|
