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Commit | Line | Data |
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5c1d3fc9 UTL |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright (C) 2014 Axis Communications AB. All rights reserved. | |
5707940e | 5 | Copyright (C) 2015 Tom Gundersen |
5c1d3fc9 UTL |
6 | |
7 | systemd is free software; you can redistribute it and/or modify it | |
8 | under the terms of the GNU Lesser General Public License as published by | |
9 | the Free Software Foundation; either version 2.1 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | systemd is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | Lesser General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU Lesser General Public License | |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
19 | ***/ | |
20 | ||
07630cea | 21 | #include <arpa/inet.h> |
5c1d3fc9 | 22 | #include <errno.h> |
5c1d3fc9 | 23 | #include <stdio.h> |
07630cea LP |
24 | #include <stdlib.h> |
25 | #include <string.h> | |
26 | ||
27 | #include "sd-ipv4acd.h" | |
28 | #include "sd-ipv4ll.h" | |
5c1d3fc9 | 29 | |
b5efdb8a | 30 | #include "alloc-util.h" |
96a7979f | 31 | #include "ether-addr-util.h" |
129dc1b4 | 32 | #include "in-addr-util.h" |
5c1d3fc9 | 33 | #include "list.h" |
3df3e884 | 34 | #include "random-util.h" |
e3dca008 TG |
35 | #include "siphash24.h" |
36 | #include "sparse-endian.h" | |
703945c1 | 37 | #include "string-util.h" |
e3dca008 | 38 | #include "util.h" |
5c1d3fc9 | 39 | |
96a7979f LP |
40 | #define IPV4LL_NETWORK UINT32_C(0xA9FE0000) |
41 | #define IPV4LL_NETMASK UINT32_C(0xFFFF0000) | |
5c1d3fc9 | 42 | |
b45e4eb6 | 43 | #define IPV4LL_DONT_DESTROY(ll) \ |
4afd3348 | 44 | _cleanup_(sd_ipv4ll_unrefp) _unused_ sd_ipv4ll *_dont_destroy_##ll = sd_ipv4ll_ref(ll) |
b45e4eb6 | 45 | |
5c1d3fc9 | 46 | struct sd_ipv4ll { |
9c8e3101 | 47 | unsigned n_ref; |
56cd007a | 48 | |
e3dca008 | 49 | sd_ipv4acd *acd; |
96a7979f | 50 | |
e3dca008 | 51 | be32_t address; /* the address pushed to ACD */ |
96a7979f LP |
52 | struct ether_addr mac; |
53 | ||
54 | struct { | |
55 | le64_t value; | |
56 | le64_t generation; | |
57 | } seed; | |
58 | bool seed_set; | |
e3dca008 | 59 | |
5c1d3fc9 UTL |
60 | /* External */ |
61 | be32_t claimed_address; | |
96a7979f | 62 | |
45aa74c7 | 63 | sd_ipv4ll_callback_t callback; |
5c1d3fc9 UTL |
64 | void* userdata; |
65 | }; | |
66 | ||
703945c1 LP |
67 | #define log_ipv4ll_errno(ll, error, fmt, ...) log_internal(LOG_DEBUG, error, __FILE__, __LINE__, __func__, "IPV4LL: " fmt, ##__VA_ARGS__) |
68 | #define log_ipv4ll(ll, fmt, ...) log_ipv4ll_errno(ll, 0, fmt, ##__VA_ARGS__) | |
69 | ||
96a7979f LP |
70 | static void ipv4ll_on_acd(sd_ipv4acd *ll, int event, void *userdata); |
71 | ||
b45e4eb6 TG |
72 | sd_ipv4ll *sd_ipv4ll_ref(sd_ipv4ll *ll) { |
73 | if (!ll) | |
74 | return NULL; | |
75 | ||
76 | assert(ll->n_ref >= 1); | |
77 | ll->n_ref++; | |
78 | ||
79 | return ll; | |
80 | } | |
81 | ||
82 | sd_ipv4ll *sd_ipv4ll_unref(sd_ipv4ll *ll) { | |
83 | if (!ll) | |
84 | return NULL; | |
85 | ||
86 | assert(ll->n_ref >= 1); | |
87 | ll->n_ref--; | |
88 | ||
89 | if (ll->n_ref > 0) | |
90 | return NULL; | |
91 | ||
e3dca008 | 92 | sd_ipv4acd_unref(ll->acd); |
b45e4eb6 TG |
93 | free(ll); |
94 | ||
95 | return NULL; | |
96 | } | |
97 | ||
b45e4eb6 | 98 | int sd_ipv4ll_new(sd_ipv4ll **ret) { |
4afd3348 | 99 | _cleanup_(sd_ipv4ll_unrefp) sd_ipv4ll *ll = NULL; |
e3dca008 | 100 | int r; |
b45e4eb6 TG |
101 | |
102 | assert_return(ret, -EINVAL); | |
103 | ||
104 | ll = new0(sd_ipv4ll, 1); | |
105 | if (!ll) | |
106 | return -ENOMEM; | |
107 | ||
0c28d288 LP |
108 | ll->n_ref = 1; |
109 | ||
e3dca008 TG |
110 | r = sd_ipv4acd_new(&ll->acd); |
111 | if (r < 0) | |
112 | return r; | |
113 | ||
114 | r = sd_ipv4acd_set_callback(ll->acd, ipv4ll_on_acd, ll); | |
115 | if (r < 0) | |
116 | return r; | |
117 | ||
b45e4eb6 TG |
118 | *ret = ll; |
119 | ll = NULL; | |
120 | ||
121 | return 0; | |
122 | } | |
123 | ||
b45e4eb6 | 124 | int sd_ipv4ll_stop(sd_ipv4ll *ll) { |
e3dca008 | 125 | assert_return(ll, -EINVAL); |
94a355a1 | 126 | |
96a7979f | 127 | return sd_ipv4acd_stop(ll->acd); |
5c1d3fc9 UTL |
128 | } |
129 | ||
2f8e7633 | 130 | int sd_ipv4ll_set_ifindex(sd_ipv4ll *ll, int ifindex) { |
e3dca008 | 131 | assert_return(ll, -EINVAL); |
2f8e7633 | 132 | assert_return(ifindex > 0, -EINVAL); |
96a7979f | 133 | assert_return(sd_ipv4ll_is_running(ll) == 0, -EBUSY); |
5c1d3fc9 | 134 | |
2f8e7633 | 135 | return sd_ipv4acd_set_ifindex(ll->acd, ifindex); |
5c1d3fc9 UTL |
136 | } |
137 | ||
e3dca008 | 138 | int sd_ipv4ll_set_mac(sd_ipv4ll *ll, const struct ether_addr *addr) { |
b26f7e8e TG |
139 | int r; |
140 | ||
e3dca008 | 141 | assert_return(ll, -EINVAL); |
96a7979f LP |
142 | assert_return(addr, -EINVAL); |
143 | assert_return(sd_ipv4ll_is_running(ll) == 0, -EBUSY); | |
b26f7e8e | 144 | |
96a7979f LP |
145 | r = sd_ipv4acd_set_mac(ll->acd, addr); |
146 | if (r < 0) | |
147 | return r; | |
5c1d3fc9 | 148 | |
96a7979f LP |
149 | ll->mac = *addr; |
150 | return 0; | |
5c1d3fc9 UTL |
151 | } |
152 | ||
153 | int sd_ipv4ll_detach_event(sd_ipv4ll *ll) { | |
154 | assert_return(ll, -EINVAL); | |
155 | ||
e3dca008 | 156 | return sd_ipv4acd_detach_event(ll->acd); |
5c1d3fc9 UTL |
157 | } |
158 | ||
32d20645 | 159 | int sd_ipv4ll_attach_event(sd_ipv4ll *ll, sd_event *event, int64_t priority) { |
5c1d3fc9 | 160 | assert_return(ll, -EINVAL); |
5c1d3fc9 | 161 | |
73e94c0d | 162 | return sd_ipv4acd_attach_event(ll->acd, event, priority); |
5c1d3fc9 UTL |
163 | } |
164 | ||
ccf86354 | 165 | int sd_ipv4ll_set_callback(sd_ipv4ll *ll, sd_ipv4ll_callback_t cb, void *userdata) { |
5c1d3fc9 UTL |
166 | assert_return(ll, -EINVAL); |
167 | ||
45aa74c7 | 168 | ll->callback = cb; |
5c1d3fc9 UTL |
169 | ll->userdata = userdata; |
170 | ||
171 | return 0; | |
172 | } | |
173 | ||
9ed794a3 | 174 | int sd_ipv4ll_get_address(sd_ipv4ll *ll, struct in_addr *address) { |
5c1d3fc9 UTL |
175 | assert_return(ll, -EINVAL); |
176 | assert_return(address, -EINVAL); | |
177 | ||
ece174c5 | 178 | if (ll->claimed_address == 0) |
5c1d3fc9 | 179 | return -ENOENT; |
5c1d3fc9 UTL |
180 | |
181 | address->s_addr = ll->claimed_address; | |
e3dca008 | 182 | |
5c1d3fc9 UTL |
183 | return 0; |
184 | } | |
185 | ||
38958cd6 | 186 | int sd_ipv4ll_set_address_seed(sd_ipv4ll *ll, uint64_t seed) { |
b5db00e5 | 187 | assert_return(ll, -EINVAL); |
96a7979f | 188 | assert_return(sd_ipv4ll_is_running(ll) == 0, -EBUSY); |
d9bf4f8c | 189 | |
96a7979f LP |
190 | ll->seed.value = htole64(seed); |
191 | ll->seed_set = true; | |
b5db00e5 | 192 | |
e3dca008 | 193 | return 0; |
b5db00e5 UTL |
194 | } |
195 | ||
04c01369 | 196 | int sd_ipv4ll_is_running(sd_ipv4ll *ll) { |
75677581 | 197 | assert_return(ll, false); |
aba496a5 | 198 | |
e3dca008 | 199 | return sd_ipv4acd_is_running(ll->acd); |
aba496a5 UTL |
200 | } |
201 | ||
129dc1b4 | 202 | static bool ipv4ll_address_is_valid(const struct in_addr *address) { |
129dc1b4 TG |
203 | assert(address); |
204 | ||
205 | if (!in_addr_is_link_local(AF_INET, (const union in_addr_union *) address)) | |
206 | return false; | |
207 | ||
ae06d1be | 208 | return !IN_SET(be32toh(address->s_addr) & 0x0000FF00U, 0x0000U, 0xFF00U); |
129dc1b4 TG |
209 | } |
210 | ||
211 | int sd_ipv4ll_set_address(sd_ipv4ll *ll, const struct in_addr *address) { | |
212 | int r; | |
213 | ||
214 | assert_return(ll, -EINVAL); | |
215 | assert_return(address, -EINVAL); | |
216 | assert_return(ipv4ll_address_is_valid(address), -EINVAL); | |
217 | ||
218 | r = sd_ipv4acd_set_address(ll->acd, address); | |
219 | if (r < 0) | |
220 | return r; | |
221 | ||
222 | ll->address = address->s_addr; | |
223 | ||
224 | return 0; | |
225 | } | |
226 | ||
96a7979f LP |
227 | #define PICK_HASH_KEY SD_ID128_MAKE(15,ac,82,a6,d6,3f,49,78,98,77,5d,0c,69,02,94,0b) |
228 | ||
e3dca008 | 229 | static int ipv4ll_pick_address(sd_ipv4ll *ll) { |
703945c1 | 230 | _cleanup_free_ char *address = NULL; |
e3dca008 | 231 | be32_t addr; |
5c1d3fc9 | 232 | |
e3dca008 | 233 | assert(ll); |
4d978a46 | 234 | |
e3dca008 | 235 | do { |
96a7979f | 236 | uint64_t h; |
5c1d3fc9 | 237 | |
96a7979f | 238 | h = siphash24(&ll->seed, sizeof(ll->seed), PICK_HASH_KEY.bytes); |
5c1d3fc9 | 239 | |
96a7979f LP |
240 | /* Increase the generation counter by one */ |
241 | ll->seed.generation = htole64(le64toh(ll->seed.generation) + 1); | |
b5db00e5 | 242 | |
96a7979f LP |
243 | addr = htobe32((h & UINT32_C(0x0000FFFF)) | IPV4LL_NETWORK); |
244 | } while (addr == ll->address || | |
ae06d1be | 245 | IN_SET(be32toh(addr) & 0x0000FF00U, 0x0000U, 0xFF00U)); |
96a7979f | 246 | |
703945c1 LP |
247 | (void) in_addr_to_string(AF_INET, &(union in_addr_union) { .in.s_addr = addr }, &address); |
248 | log_ipv4ll(ll, "Picked new IP address %s.", strna(address)); | |
249 | ||
96a7979f | 250 | return sd_ipv4ll_set_address(ll, &(struct in_addr) { addr }); |
e3dca008 TG |
251 | } |
252 | ||
96a7979f LP |
253 | #define MAC_HASH_KEY SD_ID128_MAKE(df,04,22,98,3f,ad,14,52,f9,87,2e,d1,9c,70,e2,f2) |
254 | ||
e3dca008 TG |
255 | int sd_ipv4ll_start(sd_ipv4ll *ll) { |
256 | int r; | |
96a7979f | 257 | bool picked_address = false; |
e3dca008 TG |
258 | |
259 | assert_return(ll, -EINVAL); | |
96a7979f LP |
260 | assert_return(!ether_addr_is_null(&ll->mac), -EINVAL); |
261 | assert_return(sd_ipv4ll_is_running(ll) == 0, -EBUSY); | |
262 | ||
263 | /* If no random seed is set, generate some from the MAC address */ | |
264 | if (!ll->seed_set) | |
265 | ll->seed.value = htole64(siphash24(ll->mac.ether_addr_octet, ETH_ALEN, MAC_HASH_KEY.bytes)); | |
266 | ||
267 | /* Restart the generation counter. */ | |
268 | ll->seed.generation = 0; | |
b5db00e5 UTL |
269 | |
270 | if (ll->address == 0) { | |
e3dca008 | 271 | r = ipv4ll_pick_address(ll); |
b5db00e5 | 272 | if (r < 0) |
e3dca008 | 273 | return r; |
96a7979f LP |
274 | |
275 | picked_address = true; | |
b5db00e5 | 276 | } |
5c1d3fc9 | 277 | |
e3dca008 | 278 | r = sd_ipv4acd_start(ll->acd); |
96a7979f LP |
279 | if (r < 0) { |
280 | ||
281 | /* We couldn't start? If so, let's forget the picked address again, the user might make a change and | |
282 | * retry, and we want the new data to take effect when picking an address. */ | |
283 | if (picked_address) | |
284 | ll->address = 0; | |
285 | ||
e3dca008 | 286 | return r; |
96a7979f | 287 | } |
996d1697 | 288 | |
e3dca008 TG |
289 | return 0; |
290 | } | |
996d1697 | 291 | |
e3dca008 TG |
292 | static void ipv4ll_client_notify(sd_ipv4ll *ll, int event) { |
293 | assert(ll); | |
5c1d3fc9 | 294 | |
45aa74c7 LP |
295 | if (ll->callback) |
296 | ll->callback(ll, event, ll->userdata); | |
e3dca008 | 297 | } |
5c1d3fc9 | 298 | |
e3dca008 TG |
299 | void ipv4ll_on_acd(sd_ipv4acd *acd, int event, void *userdata) { |
300 | sd_ipv4ll *ll = userdata; | |
301 | IPV4LL_DONT_DESTROY(ll); | |
302 | int r; | |
5c1d3fc9 | 303 | |
e3dca008 TG |
304 | assert(acd); |
305 | assert(ll); | |
9021bb9f | 306 | |
e3dca008 | 307 | switch (event) { |
73e94c0d | 308 | |
2237aa02 | 309 | case SD_IPV4ACD_EVENT_STOP: |
be19c5b5 | 310 | ipv4ll_client_notify(ll, SD_IPV4LL_EVENT_STOP); |
e3dca008 | 311 | ll->claimed_address = 0; |
e3dca008 | 312 | break; |
73e94c0d | 313 | |
2237aa02 | 314 | case SD_IPV4ACD_EVENT_BIND: |
e3dca008 | 315 | ll->claimed_address = ll->address; |
be19c5b5 | 316 | ipv4ll_client_notify(ll, SD_IPV4LL_EVENT_BIND); |
e3dca008 | 317 | break; |
73e94c0d | 318 | |
2237aa02 | 319 | case SD_IPV4ACD_EVENT_CONFLICT: |
e3dca008 TG |
320 | /* if an address was already bound we must call up to the |
321 | user to handle this, otherwise we just try again */ | |
322 | if (ll->claimed_address != 0) { | |
be19c5b5 | 323 | ipv4ll_client_notify(ll, SD_IPV4LL_EVENT_CONFLICT); |
e3dca008 TG |
324 | |
325 | ll->claimed_address = 0; | |
326 | } else { | |
327 | r = ipv4ll_pick_address(ll); | |
328 | if (r < 0) | |
329 | goto error; | |
330 | ||
331 | r = sd_ipv4acd_start(ll->acd); | |
332 | if (r < 0) | |
333 | goto error; | |
334 | } | |
335 | ||
336 | break; | |
96a7979f | 337 | |
e3dca008 TG |
338 | default: |
339 | assert_not_reached("Invalid IPv4ACD event."); | |
340 | } | |
341 | ||
342 | return; | |
343 | ||
344 | error: | |
be19c5b5 | 345 | ipv4ll_client_notify(ll, SD_IPV4LL_EVENT_STOP); |
5c1d3fc9 | 346 | } |