Line data Source code
1 : /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
2 :
3 : /***
4 : This file is part of systemd.
5 :
6 : Copyright 2013-2014 Tom Gundersen <teg@jklm.no>
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 <netinet/ether.h>
23 : #include <linux/if.h>
24 :
25 : #include "networkd-link.h"
26 : #include "network-internal.h"
27 :
28 0 : static int ipv4ll_address_lost(Link *link) {
29 0 : _cleanup_address_free_ Address *address = NULL;
30 0 : _cleanup_route_free_ Route *route = NULL;
31 : struct in_addr addr;
32 : int r;
33 :
34 0 : assert(link);
35 :
36 0 : link->ipv4ll_route = false;
37 0 : link->ipv4ll_address = false;
38 :
39 0 : r = sd_ipv4ll_get_address(link->ipv4ll, &addr);
40 0 : if (r < 0)
41 0 : return 0;
42 :
43 0 : log_link_debug(link, "IPv4 link-local release %u.%u.%u.%u", ADDRESS_FMT_VAL(addr));
44 :
45 0 : r = address_new_dynamic(&address);
46 0 : if (r < 0) {
47 0 : log_link_error(link, "Could not allocate address: %s", strerror(-r));
48 0 : return r;
49 : }
50 :
51 0 : address->family = AF_INET;
52 0 : address->in_addr.in = addr;
53 0 : address->prefixlen = 16;
54 0 : address->scope = RT_SCOPE_LINK;
55 :
56 0 : address_drop(address, link, &link_address_drop_handler);
57 :
58 0 : r = route_new_dynamic(&route, RTPROT_UNSPEC);
59 0 : if (r < 0) {
60 0 : log_link_error(link, "Could not allocate route: %s",
61 : strerror(-r));
62 0 : return r;
63 : }
64 :
65 0 : route->family = AF_INET;
66 0 : route->scope = RT_SCOPE_LINK;
67 0 : route->metrics = IPV4LL_ROUTE_METRIC;
68 :
69 0 : route_drop(route, link, &link_route_drop_handler);
70 :
71 0 : link_client_handler(link);
72 :
73 0 : return 0;
74 : }
75 :
76 0 : static int ipv4ll_route_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
77 0 : _cleanup_link_unref_ Link *link = userdata;
78 : int r;
79 :
80 0 : assert(link);
81 0 : assert(!link->ipv4ll_route);
82 :
83 0 : r = sd_netlink_message_get_errno(m);
84 0 : if (r < 0 && r != -EEXIST) {
85 0 : log_link_error(link, "could not set ipv4ll route: %s", strerror(-r));
86 0 : link_enter_failed(link);
87 : }
88 :
89 0 : link->ipv4ll_route = true;
90 :
91 0 : if (link->ipv4ll_address == true)
92 0 : link_client_handler(link);
93 :
94 0 : return 1;
95 : }
96 :
97 0 : static int ipv4ll_address_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
98 0 : _cleanup_link_unref_ Link *link = userdata;
99 : int r;
100 :
101 0 : assert(link);
102 0 : assert(!link->ipv4ll_address);
103 :
104 0 : r = sd_netlink_message_get_errno(m);
105 0 : if (r < 0 && r != -EEXIST) {
106 0 : log_link_error(link, "could not set ipv4ll address: %s", strerror(-r));
107 0 : link_enter_failed(link);
108 0 : } else if (r >= 0)
109 0 : link_rtnl_process_address(rtnl, m, link->manager);
110 :
111 0 : link->ipv4ll_address = true;
112 :
113 0 : if (link->ipv4ll_route == true)
114 0 : link_client_handler(link);
115 :
116 0 : return 1;
117 : }
118 :
119 0 : static int ipv4ll_address_claimed(sd_ipv4ll *ll, Link *link) {
120 0 : _cleanup_address_free_ Address *ll_addr = NULL;
121 0 : _cleanup_route_free_ Route *route = NULL;
122 : struct in_addr address;
123 : int r;
124 :
125 0 : assert(ll);
126 0 : assert(link);
127 :
128 0 : r = sd_ipv4ll_get_address(ll, &address);
129 0 : if (r == -ENOENT)
130 0 : return 0;
131 0 : else if (r < 0)
132 0 : return r;
133 :
134 0 : log_link_debug(link, "IPv4 link-local claim %u.%u.%u.%u",
135 : ADDRESS_FMT_VAL(address));
136 :
137 0 : r = address_new_dynamic(&ll_addr);
138 0 : if (r < 0)
139 0 : return r;
140 :
141 0 : ll_addr->family = AF_INET;
142 0 : ll_addr->in_addr.in = address;
143 0 : ll_addr->prefixlen = 16;
144 0 : ll_addr->broadcast.s_addr = ll_addr->in_addr.in.s_addr | htonl(0xfffffffflu >> ll_addr->prefixlen);
145 0 : ll_addr->scope = RT_SCOPE_LINK;
146 :
147 0 : r = address_configure(ll_addr, link, ipv4ll_address_handler);
148 0 : if (r < 0)
149 0 : return r;
150 :
151 0 : link->ipv4ll_address = false;
152 :
153 0 : r = route_new_dynamic(&route, RTPROT_STATIC);
154 0 : if (r < 0)
155 0 : return r;
156 :
157 0 : route->family = AF_INET;
158 0 : route->scope = RT_SCOPE_LINK;
159 0 : route->metrics = IPV4LL_ROUTE_METRIC;
160 :
161 0 : r = route_configure(route, link, ipv4ll_route_handler);
162 0 : if (r < 0)
163 0 : return r;
164 :
165 0 : link->ipv4ll_route = false;
166 :
167 0 : return 0;
168 : }
169 :
170 0 : static void ipv4ll_handler(sd_ipv4ll *ll, int event, void *userdata){
171 0 : Link *link = userdata;
172 : int r;
173 :
174 0 : assert(link);
175 0 : assert(link->network);
176 0 : assert(link->manager);
177 :
178 0 : if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
179 0 : return;
180 :
181 0 : switch(event) {
182 : case IPV4LL_EVENT_STOP:
183 : case IPV4LL_EVENT_CONFLICT:
184 0 : r = ipv4ll_address_lost(link);
185 0 : if (r < 0) {
186 0 : link_enter_failed(link);
187 0 : return;
188 : }
189 0 : break;
190 : case IPV4LL_EVENT_BIND:
191 0 : r = ipv4ll_address_claimed(ll, link);
192 0 : if (r < 0) {
193 0 : link_enter_failed(link);
194 0 : return;
195 : }
196 0 : break;
197 : default:
198 0 : if (event < 0)
199 0 : log_link_warning(link, "IPv4 link-local error: %s", strerror(-event));
200 : else
201 0 : log_link_warning(link, "IPv4 link-local unknown event: %d", event);
202 0 : break;
203 : }
204 : }
205 :
206 0 : int ipv4ll_configure(Link *link) {
207 : uint8_t seed[8];
208 : int r;
209 :
210 0 : assert(link);
211 0 : assert(link->network);
212 0 : assert(link->network->link_local & ADDRESS_FAMILY_IPV4);
213 :
214 0 : r = sd_ipv4ll_new(&link->ipv4ll);
215 0 : if (r < 0)
216 0 : return r;
217 :
218 0 : if (link->udev_device) {
219 0 : r = net_get_unique_predictable_data(link->udev_device, seed);
220 0 : if (r >= 0) {
221 0 : r = sd_ipv4ll_set_address_seed(link->ipv4ll, seed);
222 0 : if (r < 0)
223 0 : return r;
224 : }
225 : }
226 :
227 0 : r = sd_ipv4ll_attach_event(link->ipv4ll, NULL, 0);
228 0 : if (r < 0)
229 0 : return r;
230 :
231 0 : r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
232 0 : if (r < 0)
233 0 : return r;
234 :
235 0 : r = sd_ipv4ll_set_index(link->ipv4ll, link->ifindex);
236 0 : if (r < 0)
237 0 : return r;
238 :
239 0 : r = sd_ipv4ll_set_callback(link->ipv4ll, ipv4ll_handler, link);
240 0 : if (r < 0)
241 0 : return r;
242 :
243 0 : return 0;
244 : }
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