Line data Source code
1 : /* SPDX-License-Identifier: LGPL-2.1+ */
2 :
3 : #include <netinet/in.h>
4 : #include <linux/if.h>
5 :
6 : #include "network-internal.h"
7 : #include "networkd-address.h"
8 : #include "networkd-ipv4ll.h"
9 : #include "networkd-link.h"
10 : #include "networkd-manager.h"
11 : #include "parse-util.h"
12 :
13 0 : static int ipv4ll_address_lost(Link *link) {
14 0 : _cleanup_(address_freep) Address *address = NULL;
15 0 : _cleanup_(route_freep) Route *route = NULL;
16 : struct in_addr addr;
17 : int r;
18 :
19 0 : assert(link);
20 :
21 0 : link->ipv4ll_route = false;
22 0 : link->ipv4ll_address = false;
23 :
24 0 : r = sd_ipv4ll_get_address(link->ipv4ll, &addr);
25 0 : if (r < 0)
26 0 : return 0;
27 :
28 0 : log_link_debug(link, "IPv4 link-local release %u.%u.%u.%u", ADDRESS_FMT_VAL(addr));
29 :
30 0 : r = address_new(&address);
31 0 : if (r < 0)
32 0 : return log_link_error_errno(link, r, "Could not allocate address: %m");
33 :
34 0 : address->family = AF_INET;
35 0 : address->in_addr.in = addr;
36 0 : address->prefixlen = 16;
37 0 : address->scope = RT_SCOPE_LINK;
38 :
39 0 : r = address_remove(address, link, NULL);
40 0 : if (r < 0)
41 0 : return r;
42 :
43 0 : r = route_new(&route);
44 0 : if (r < 0)
45 0 : return log_link_error_errno(link, r, "Could not allocate route: %m");
46 :
47 0 : route->family = AF_INET;
48 0 : route->scope = RT_SCOPE_LINK;
49 0 : route->priority = IPV4LL_ROUTE_METRIC;
50 :
51 0 : r = route_remove(route, link, NULL);
52 0 : if (r < 0)
53 0 : return r;
54 :
55 0 : link_check_ready(link);
56 :
57 0 : return 0;
58 : }
59 :
60 0 : static int ipv4ll_route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
61 : int r;
62 :
63 0 : assert(link);
64 0 : assert(!link->ipv4ll_route);
65 :
66 0 : r = sd_netlink_message_get_errno(m);
67 0 : if (r < 0 && r != -EEXIST) {
68 0 : log_link_error_errno(link, r, "could not set ipv4ll route: %m");
69 0 : link_enter_failed(link);
70 0 : return 1;
71 : }
72 :
73 0 : link->ipv4ll_route = true;
74 :
75 0 : link_check_ready(link);
76 :
77 0 : return 1;
78 : }
79 :
80 0 : static int ipv4ll_route_configure(Link *link) {
81 0 : _cleanup_(route_freep) Route *route = NULL;
82 : int r;
83 :
84 0 : r = route_new(&route);
85 0 : if (r < 0)
86 0 : return r;
87 :
88 0 : route->family = AF_INET;
89 0 : route->scope = RT_SCOPE_LINK;
90 0 : route->protocol = RTPROT_STATIC;
91 0 : route->priority = IPV4LL_ROUTE_METRIC;
92 0 : route->table = link_get_vrf_table(link);
93 :
94 0 : return route_configure(route, link, ipv4ll_route_handler);
95 : }
96 :
97 0 : static int ipv4ll_address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
98 : int r;
99 :
100 0 : assert(link);
101 0 : assert(!link->ipv4ll_address);
102 :
103 0 : r = sd_netlink_message_get_errno(m);
104 0 : if (r < 0 && r != -EEXIST) {
105 0 : log_link_error_errno(link, r, "could not set ipv4ll address: %m");
106 0 : link_enter_failed(link);
107 0 : return 1;
108 0 : } else if (r >= 0)
109 0 : (void) manager_rtnl_process_address(rtnl, m, link->manager);
110 :
111 0 : link->ipv4ll_address = true;
112 :
113 0 : r = ipv4ll_route_configure(link);
114 0 : if (r < 0) {
115 0 : log_link_error_errno(link, r, "Failed to configure ipv4ll route: %m");
116 0 : link_enter_failed(link);
117 : }
118 :
119 0 : return 1;
120 : }
121 :
122 0 : static int ipv4ll_address_claimed(sd_ipv4ll *ll, Link *link) {
123 0 : _cleanup_(address_freep) Address *ll_addr = NULL;
124 : struct in_addr address;
125 : int r;
126 :
127 0 : assert(ll);
128 0 : assert(link);
129 :
130 0 : link->ipv4ll_address = false;
131 0 : link->ipv4ll_route = false;
132 :
133 0 : r = sd_ipv4ll_get_address(ll, &address);
134 0 : if (r == -ENOENT)
135 0 : return 0;
136 0 : else if (r < 0)
137 0 : return r;
138 :
139 0 : log_link_debug(link, "IPv4 link-local claim %u.%u.%u.%u",
140 : ADDRESS_FMT_VAL(address));
141 :
142 0 : r = address_new(&ll_addr);
143 0 : if (r < 0)
144 0 : return r;
145 :
146 0 : ll_addr->family = AF_INET;
147 0 : ll_addr->in_addr.in = address;
148 0 : ll_addr->prefixlen = 16;
149 0 : ll_addr->broadcast.s_addr = ll_addr->in_addr.in.s_addr | htobe32(0xfffffffflu >> ll_addr->prefixlen);
150 0 : ll_addr->scope = RT_SCOPE_LINK;
151 :
152 0 : r = address_configure(ll_addr, link, ipv4ll_address_handler, false);
153 0 : if (r < 0)
154 0 : return r;
155 :
156 0 : return 0;
157 : }
158 :
159 0 : static void ipv4ll_handler(sd_ipv4ll *ll, int event, void *userdata) {
160 0 : Link *link = userdata;
161 : int r;
162 :
163 0 : assert(link);
164 0 : assert(link->network);
165 :
166 0 : if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
167 0 : return;
168 :
169 0 : switch(event) {
170 0 : case SD_IPV4LL_EVENT_STOP:
171 0 : r = ipv4ll_address_lost(link);
172 0 : if (r < 0) {
173 0 : link_enter_failed(link);
174 0 : return;
175 : }
176 0 : break;
177 0 : case SD_IPV4LL_EVENT_CONFLICT:
178 0 : r = ipv4ll_address_lost(link);
179 0 : if (r < 0) {
180 0 : link_enter_failed(link);
181 0 : return;
182 : }
183 :
184 0 : r = sd_ipv4ll_restart(ll);
185 0 : if (r < 0)
186 0 : log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
187 0 : break;
188 0 : case SD_IPV4LL_EVENT_BIND:
189 0 : r = ipv4ll_address_claimed(ll, link);
190 0 : if (r < 0) {
191 0 : log_link_error(link, "Failed to configure ipv4ll address: %m");
192 0 : link_enter_failed(link);
193 0 : return;
194 : }
195 0 : break;
196 0 : default:
197 0 : log_link_warning(link, "IPv4 link-local unknown event: %d", event);
198 0 : break;
199 : }
200 : }
201 :
202 0 : int ipv4ll_configure(Link *link) {
203 : uint64_t seed;
204 : int r;
205 :
206 0 : assert(link);
207 0 : assert(link->network);
208 0 : assert(link->network->link_local & (ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4));
209 :
210 0 : if (!link->ipv4ll) {
211 0 : r = sd_ipv4ll_new(&link->ipv4ll);
212 0 : if (r < 0)
213 0 : return r;
214 : }
215 :
216 0 : if (link->sd_device &&
217 0 : net_get_unique_predictable_data(link->sd_device, true, &seed) >= 0) {
218 0 : r = sd_ipv4ll_set_address_seed(link->ipv4ll, seed);
219 0 : if (r < 0)
220 0 : return r;
221 : }
222 :
223 0 : r = sd_ipv4ll_attach_event(link->ipv4ll, NULL, 0);
224 0 : if (r < 0)
225 0 : return r;
226 :
227 0 : r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
228 0 : if (r < 0)
229 0 : return r;
230 :
231 0 : r = sd_ipv4ll_set_ifindex(link->ipv4ll, link->ifindex);
232 0 : if (r < 0)
233 0 : return r;
234 :
235 0 : r = sd_ipv4ll_set_callback(link->ipv4ll, ipv4ll_handler, link);
236 0 : if (r < 0)
237 0 : return r;
238 :
239 0 : return 0;
240 : }
241 :
242 0 : int config_parse_ipv4ll(
243 : const char* unit,
244 : const char *filename,
245 : unsigned line,
246 : const char *section,
247 : unsigned section_line,
248 : const char *lvalue,
249 : int ltype,
250 : const char *rvalue,
251 : void *data,
252 : void *userdata) {
253 :
254 0 : AddressFamily *link_local = data;
255 : int r;
256 :
257 0 : assert(filename);
258 0 : assert(lvalue);
259 0 : assert(rvalue);
260 0 : assert(data);
261 :
262 : /* Note that this is mostly like
263 : * config_parse_address_family(), except that it
264 : * applies only to IPv4 */
265 :
266 0 : r = parse_boolean(rvalue);
267 0 : if (r < 0) {
268 0 : log_syntax(unit, LOG_ERR, filename, line, r,
269 : "Failed to parse %s=%s, ignoring assignment. "
270 : "Note that the setting %s= is deprecated, please use LinkLocalAddressing= instead.",
271 : lvalue, rvalue, lvalue);
272 0 : return 0;
273 : }
274 :
275 0 : SET_FLAG(*link_local, ADDRESS_FAMILY_IPV4, r);
276 :
277 0 : log_syntax(unit, LOG_WARNING, filename, line, 0,
278 : "%s=%s is deprecated, please use LinkLocalAddressing=%s instead.",
279 : lvalue, rvalue, address_family_to_string(*link_local));
280 :
281 0 : return 0;
282 : }
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