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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 | static int ipv4ll_address_lost(Link *link) { | |
29 | _cleanup_address_free_ Address *address = NULL; | |
30 | _cleanup_route_free_ Route *route = NULL; | |
31 | struct in_addr addr; | |
32 | int r; | |
33 | ||
34 | assert(link); | |
35 | ||
36 | link->ipv4ll_route = false; | |
920b52e4 | 37 | link->ipv4ll_address = false; |
b22d8a00 TG |
38 | |
39 | r = sd_ipv4ll_get_address(link->ipv4ll, &addr); | |
40 | if (r < 0) | |
41 | return 0; | |
42 | ||
79008bdd | 43 | log_link_debug(link, "IPv4 link-local release %u.%u.%u.%u", ADDRESS_FMT_VAL(addr)); |
b22d8a00 | 44 | |
f0213e37 | 45 | r = address_new(&address); |
b22d8a00 | 46 | if (r < 0) { |
e53fc357 | 47 | log_link_error_errno(link, r, "Could not allocate address: %m"); |
b22d8a00 TG |
48 | return r; |
49 | } | |
50 | ||
51 | address->family = AF_INET; | |
52 | address->in_addr.in = addr; | |
53 | address->prefixlen = 16; | |
54 | address->scope = RT_SCOPE_LINK; | |
55 | ||
91b5f997 | 56 | address_remove(address, link, &link_address_remove_handler); |
b22d8a00 | 57 | |
ed9e361a | 58 | r = route_new(&route); |
b22d8a00 | 59 | if (r < 0) { |
e53fc357 | 60 | log_link_error_errno(link, r, "Could not allocate route: %m"); |
b22d8a00 TG |
61 | return r; |
62 | } | |
63 | ||
64 | route->family = AF_INET; | |
65 | route->scope = RT_SCOPE_LINK; | |
66 | route->metrics = IPV4LL_ROUTE_METRIC; | |
67 | ||
91b5f997 | 68 | route_remove(route, link, &link_route_remove_handler); |
b22d8a00 | 69 | |
8012cd39 | 70 | link_check_ready(link); |
b22d8a00 TG |
71 | |
72 | return 0; | |
73 | } | |
74 | ||
1c4baffc | 75 | static int ipv4ll_route_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) { |
b22d8a00 TG |
76 | _cleanup_link_unref_ Link *link = userdata; |
77 | int r; | |
78 | ||
79 | assert(link); | |
80 | assert(!link->ipv4ll_route); | |
81 | ||
1c4baffc | 82 | r = sd_netlink_message_get_errno(m); |
b22d8a00 | 83 | if (r < 0 && r != -EEXIST) { |
e53fc357 | 84 | log_link_error_errno(link, r, "could not set ipv4ll route: %m"); |
b22d8a00 TG |
85 | link_enter_failed(link); |
86 | } | |
87 | ||
88 | link->ipv4ll_route = true; | |
89 | ||
90 | if (link->ipv4ll_address == true) | |
8012cd39 | 91 | link_check_ready(link); |
b22d8a00 TG |
92 | |
93 | return 1; | |
94 | } | |
95 | ||
1c4baffc | 96 | static int ipv4ll_address_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) { |
b22d8a00 TG |
97 | _cleanup_link_unref_ Link *link = userdata; |
98 | int r; | |
99 | ||
100 | assert(link); | |
101 | assert(!link->ipv4ll_address); | |
102 | ||
1c4baffc | 103 | r = sd_netlink_message_get_errno(m); |
b22d8a00 | 104 | if (r < 0 && r != -EEXIST) { |
e53fc357 | 105 | log_link_error_errno(link, r, "could not set ipv4ll address: %m"); |
b22d8a00 | 106 | link_enter_failed(link); |
45af44d4 | 107 | } else if (r >= 0) |
200a0868 | 108 | manager_rtnl_process_address(rtnl, m, link->manager); |
b22d8a00 TG |
109 | |
110 | link->ipv4ll_address = true; | |
111 | ||
112 | if (link->ipv4ll_route == true) | |
8012cd39 | 113 | link_check_ready(link); |
b22d8a00 TG |
114 | |
115 | return 1; | |
116 | } | |
117 | ||
118 | static int ipv4ll_address_claimed(sd_ipv4ll *ll, Link *link) { | |
119 | _cleanup_address_free_ Address *ll_addr = NULL; | |
120 | _cleanup_route_free_ Route *route = NULL; | |
121 | struct in_addr address; | |
122 | int r; | |
123 | ||
124 | assert(ll); | |
125 | assert(link); | |
126 | ||
127 | r = sd_ipv4ll_get_address(ll, &address); | |
128 | if (r == -ENOENT) | |
129 | return 0; | |
130 | else if (r < 0) | |
131 | return r; | |
132 | ||
79008bdd | 133 | log_link_debug(link, "IPv4 link-local claim %u.%u.%u.%u", |
b22d8a00 TG |
134 | ADDRESS_FMT_VAL(address)); |
135 | ||
f0213e37 | 136 | r = address_new(&ll_addr); |
b22d8a00 TG |
137 | if (r < 0) |
138 | return r; | |
139 | ||
140 | ll_addr->family = AF_INET; | |
141 | ll_addr->in_addr.in = address; | |
142 | ll_addr->prefixlen = 16; | |
143 | ll_addr->broadcast.s_addr = ll_addr->in_addr.in.s_addr | htonl(0xfffffffflu >> ll_addr->prefixlen); | |
144 | ll_addr->scope = RT_SCOPE_LINK; | |
145 | ||
66669078 | 146 | r = address_configure(ll_addr, link, ipv4ll_address_handler, false); |
b22d8a00 TG |
147 | if (r < 0) |
148 | return r; | |
149 | ||
150 | link->ipv4ll_address = false; | |
151 | ||
ed9e361a | 152 | r = route_new(&route); |
b22d8a00 TG |
153 | if (r < 0) |
154 | return r; | |
155 | ||
156 | route->family = AF_INET; | |
157 | route->scope = RT_SCOPE_LINK; | |
ed9e361a | 158 | route->protocol = RTPROT_STATIC; |
b22d8a00 TG |
159 | route->metrics = IPV4LL_ROUTE_METRIC; |
160 | ||
161 | r = route_configure(route, link, ipv4ll_route_handler); | |
162 | if (r < 0) | |
163 | return r; | |
164 | ||
165 | link->ipv4ll_route = false; | |
166 | ||
167 | return 0; | |
168 | } | |
169 | ||
170 | static void ipv4ll_handler(sd_ipv4ll *ll, int event, void *userdata){ | |
171 | Link *link = userdata; | |
172 | int r; | |
173 | ||
174 | assert(link); | |
175 | assert(link->network); | |
176 | assert(link->manager); | |
177 | ||
178 | if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) | |
179 | return; | |
180 | ||
181 | switch(event) { | |
be19c5b5 DH |
182 | case SD_IPV4LL_EVENT_STOP: |
183 | case SD_IPV4LL_EVENT_CONFLICT: | |
b22d8a00 TG |
184 | r = ipv4ll_address_lost(link); |
185 | if (r < 0) { | |
186 | link_enter_failed(link); | |
187 | return; | |
188 | } | |
189 | break; | |
be19c5b5 | 190 | case SD_IPV4LL_EVENT_BIND: |
b22d8a00 TG |
191 | r = ipv4ll_address_claimed(ll, link); |
192 | if (r < 0) { | |
193 | link_enter_failed(link); | |
194 | return; | |
195 | } | |
196 | break; | |
197 | default: | |
b45e4eb6 | 198 | log_link_warning(link, "IPv4 link-local unknown event: %d", event); |
b22d8a00 TG |
199 | break; |
200 | } | |
201 | } | |
202 | ||
203 | int ipv4ll_configure(Link *link) { | |
204 | uint8_t seed[8]; | |
205 | int r; | |
206 | ||
207 | assert(link); | |
208 | assert(link->network); | |
e0ee46f2 | 209 | assert(link->network->link_local & ADDRESS_FAMILY_IPV4); |
b22d8a00 TG |
210 | |
211 | r = sd_ipv4ll_new(&link->ipv4ll); | |
212 | if (r < 0) | |
213 | return r; | |
214 | ||
215 | if (link->udev_device) { | |
216 | r = net_get_unique_predictable_data(link->udev_device, seed); | |
217 | if (r >= 0) { | |
e3dca008 TG |
218 | assert_cc(sizeof(unsigned) <= 8); |
219 | ||
220 | r = sd_ipv4ll_set_address_seed(link->ipv4ll, *(unsigned *)seed); | |
b22d8a00 TG |
221 | if (r < 0) |
222 | return r; | |
223 | } | |
224 | } | |
225 | ||
226 | r = sd_ipv4ll_attach_event(link->ipv4ll, NULL, 0); | |
227 | if (r < 0) | |
228 | return r; | |
229 | ||
230 | r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac); | |
231 | if (r < 0) | |
232 | return r; | |
233 | ||
234 | r = sd_ipv4ll_set_index(link->ipv4ll, link->ifindex); | |
235 | if (r < 0) | |
236 | return r; | |
237 | ||
238 | r = sd_ipv4ll_set_callback(link->ipv4ll, ipv4ll_handler, link); | |
239 | if (r < 0) | |
240 | return r; | |
241 | ||
242 | return 0; | |
243 | } |