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
|
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2013-2014 Tom Gundersen <teg@jklm.no>
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 <netinet/ether.h>
#include <linux/if.h>
#include "networkd-link.h"
#include "network-internal.h"
static int ipv4ll_address_lost(Link *link) {
_cleanup_address_free_ Address *address = NULL;
_cleanup_route_free_ Route *route = NULL;
struct in_addr addr;
int r;
assert(link);
link->ipv4ll_route = false;
link->ipv4ll_address = false;
r = sd_ipv4ll_get_address(link->ipv4ll, &addr);
if (r < 0)
return 0;
log_debug_link(link, "IPv4 link-local release %u.%u.%u.%u", ADDRESS_FMT_VAL(addr));
r = address_new_dynamic(&address);
if (r < 0) {
log_error_link(link, "Could not allocate address: %s", strerror(-r));
return r;
}
address->family = AF_INET;
address->in_addr.in = addr;
address->prefixlen = 16;
address->scope = RT_SCOPE_LINK;
address_drop(address, link, &link_address_drop_handler);
r = route_new_dynamic(&route, RTPROT_UNSPEC);
if (r < 0) {
log_error_link(link, "Could not allocate route: %s",
strerror(-r));
return r;
}
route->family = AF_INET;
route->scope = RT_SCOPE_LINK;
route->metrics = IPV4LL_ROUTE_METRIC;
route_drop(route, link, &link_route_drop_handler);
link_client_handler(link);
return 0;
}
static int ipv4ll_route_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
_cleanup_link_unref_ Link *link = userdata;
int r;
assert(link);
assert(!link->ipv4ll_route);
r = sd_rtnl_message_get_errno(m);
if (r < 0 && r != -EEXIST) {
log_error_link(link, "could not set ipv4ll route: %s", strerror(-r));
link_enter_failed(link);
}
link->ipv4ll_route = true;
if (link->ipv4ll_address == true)
link_client_handler(link);
return 1;
}
static int ipv4ll_address_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
_cleanup_link_unref_ Link *link = userdata;
int r;
assert(link);
assert(!link->ipv4ll_address);
r = sd_rtnl_message_get_errno(m);
if (r < 0 && r != -EEXIST) {
log_error_link(link, "could not set ipv4ll address: %s", strerror(-r));
link_enter_failed(link);
} else if (r >= 0) {
/* calling handler directly so take a ref */
link_ref(link);
link_get_address_handler(rtnl, m, link);
}
link->ipv4ll_address = true;
if (link->ipv4ll_route == true)
link_client_handler(link);
return 1;
}
static int ipv4ll_address_claimed(sd_ipv4ll *ll, Link *link) {
_cleanup_address_free_ Address *ll_addr = NULL;
_cleanup_route_free_ Route *route = NULL;
struct in_addr address;
int r;
assert(ll);
assert(link);
r = sd_ipv4ll_get_address(ll, &address);
if (r == -ENOENT)
return 0;
else if (r < 0)
return r;
log_debug_link(link, "IPv4 link-local claim %u.%u.%u.%u",
ADDRESS_FMT_VAL(address));
r = address_new_dynamic(&ll_addr);
if (r < 0)
return r;
ll_addr->family = AF_INET;
ll_addr->in_addr.in = address;
ll_addr->prefixlen = 16;
ll_addr->broadcast.s_addr = ll_addr->in_addr.in.s_addr | htonl(0xfffffffflu >> ll_addr->prefixlen);
ll_addr->scope = RT_SCOPE_LINK;
r = address_configure(ll_addr, link, ipv4ll_address_handler);
if (r < 0)
return r;
link->ipv4ll_address = false;
r = route_new_dynamic(&route, RTPROT_STATIC);
if (r < 0)
return r;
route->family = AF_INET;
route->scope = RT_SCOPE_LINK;
route->metrics = IPV4LL_ROUTE_METRIC;
r = route_configure(route, link, ipv4ll_route_handler);
if (r < 0)
return r;
link->ipv4ll_route = false;
return 0;
}
static void ipv4ll_handler(sd_ipv4ll *ll, int event, void *userdata){
Link *link = userdata;
int r;
assert(link);
assert(link->network);
assert(link->manager);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return;
switch(event) {
case IPV4LL_EVENT_STOP:
case IPV4LL_EVENT_CONFLICT:
r = ipv4ll_address_lost(link);
if (r < 0) {
link_enter_failed(link);
return;
}
break;
case IPV4LL_EVENT_BIND:
r = ipv4ll_address_claimed(ll, link);
if (r < 0) {
link_enter_failed(link);
return;
}
break;
default:
if (event < 0)
log_warning_link(link, "IPv4 link-local error: %s", strerror(-event));
else
log_warning_link(link, "IPv4 link-local unknown event: %d", event);
break;
}
}
int ipv4ll_configure(Link *link) {
uint8_t seed[8];
int r;
assert(link);
assert(link->network);
assert(link->network->ipv4ll);
r = sd_ipv4ll_new(&link->ipv4ll);
if (r < 0)
return r;
if (link->udev_device) {
r = net_get_unique_predictable_data(link->udev_device, seed);
if (r >= 0) {
r = sd_ipv4ll_set_address_seed(link->ipv4ll, seed);
if (r < 0)
return r;
}
}
r = sd_ipv4ll_attach_event(link->ipv4ll, NULL, 0);
if (r < 0)
return r;
r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
if (r < 0)
return r;
r = sd_ipv4ll_set_index(link->ipv4ll, link->ifindex);
if (r < 0)
return r;
r = sd_ipv4ll_set_callback(link->ipv4ll, ipv4ll_handler, link);
if (r < 0)
return r;
return 0;
}
|
