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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
5c1d3fc9 UTL |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright (C) 2014 Axis Communications AB. All rights reserved. | |
5707940e | 6 | Copyright (C) 2015 Tom Gundersen |
5c1d3fc9 UTL |
7 | ***/ |
8 | ||
07630cea | 9 | #include <arpa/inet.h> |
5c1d3fc9 | 10 | #include <errno.h> |
5c1d3fc9 | 11 | #include <stdio.h> |
07630cea LP |
12 | #include <stdlib.h> |
13 | #include <string.h> | |
14 | ||
dccca82b | 15 | #include "sd-id128.h" |
07630cea LP |
16 | #include "sd-ipv4acd.h" |
17 | #include "sd-ipv4ll.h" | |
5c1d3fc9 | 18 | |
b5efdb8a | 19 | #include "alloc-util.h" |
96a7979f | 20 | #include "ether-addr-util.h" |
129dc1b4 | 21 | #include "in-addr-util.h" |
5c1d3fc9 | 22 | #include "list.h" |
3df3e884 | 23 | #include "random-util.h" |
e3dca008 TG |
24 | #include "siphash24.h" |
25 | #include "sparse-endian.h" | |
703945c1 | 26 | #include "string-util.h" |
e3dca008 | 27 | #include "util.h" |
5c1d3fc9 | 28 | |
96a7979f LP |
29 | #define IPV4LL_NETWORK UINT32_C(0xA9FE0000) |
30 | #define IPV4LL_NETMASK UINT32_C(0xFFFF0000) | |
5c1d3fc9 | 31 | |
b45e4eb6 | 32 | #define IPV4LL_DONT_DESTROY(ll) \ |
4afd3348 | 33 | _cleanup_(sd_ipv4ll_unrefp) _unused_ sd_ipv4ll *_dont_destroy_##ll = sd_ipv4ll_ref(ll) |
b45e4eb6 | 34 | |
5c1d3fc9 | 35 | struct sd_ipv4ll { |
9c8e3101 | 36 | unsigned n_ref; |
56cd007a | 37 | |
e3dca008 | 38 | sd_ipv4acd *acd; |
96a7979f | 39 | |
e3dca008 | 40 | be32_t address; /* the address pushed to ACD */ |
96a7979f LP |
41 | struct ether_addr mac; |
42 | ||
43 | struct { | |
44 | le64_t value; | |
45 | le64_t generation; | |
46 | } seed; | |
47 | bool seed_set; | |
e3dca008 | 48 | |
5c1d3fc9 UTL |
49 | /* External */ |
50 | be32_t claimed_address; | |
96a7979f | 51 | |
45aa74c7 | 52 | sd_ipv4ll_callback_t callback; |
5c1d3fc9 UTL |
53 | void* userdata; |
54 | }; | |
55 | ||
703945c1 LP |
56 | #define log_ipv4ll_errno(ll, error, fmt, ...) log_internal(LOG_DEBUG, error, __FILE__, __LINE__, __func__, "IPV4LL: " fmt, ##__VA_ARGS__) |
57 | #define log_ipv4ll(ll, fmt, ...) log_ipv4ll_errno(ll, 0, fmt, ##__VA_ARGS__) | |
58 | ||
96a7979f LP |
59 | static void ipv4ll_on_acd(sd_ipv4acd *ll, int event, void *userdata); |
60 | ||
b45e4eb6 TG |
61 | sd_ipv4ll *sd_ipv4ll_ref(sd_ipv4ll *ll) { |
62 | if (!ll) | |
63 | return NULL; | |
64 | ||
65 | assert(ll->n_ref >= 1); | |
66 | ll->n_ref++; | |
67 | ||
68 | return ll; | |
69 | } | |
70 | ||
71 | sd_ipv4ll *sd_ipv4ll_unref(sd_ipv4ll *ll) { | |
72 | if (!ll) | |
73 | return NULL; | |
74 | ||
75 | assert(ll->n_ref >= 1); | |
76 | ll->n_ref--; | |
77 | ||
78 | if (ll->n_ref > 0) | |
79 | return NULL; | |
80 | ||
e3dca008 | 81 | sd_ipv4acd_unref(ll->acd); |
6b430fdb | 82 | return mfree(ll); |
b45e4eb6 TG |
83 | } |
84 | ||
b45e4eb6 | 85 | int sd_ipv4ll_new(sd_ipv4ll **ret) { |
4afd3348 | 86 | _cleanup_(sd_ipv4ll_unrefp) sd_ipv4ll *ll = NULL; |
e3dca008 | 87 | int r; |
b45e4eb6 TG |
88 | |
89 | assert_return(ret, -EINVAL); | |
90 | ||
91 | ll = new0(sd_ipv4ll, 1); | |
92 | if (!ll) | |
93 | return -ENOMEM; | |
94 | ||
0c28d288 LP |
95 | ll->n_ref = 1; |
96 | ||
e3dca008 TG |
97 | r = sd_ipv4acd_new(&ll->acd); |
98 | if (r < 0) | |
99 | return r; | |
100 | ||
101 | r = sd_ipv4acd_set_callback(ll->acd, ipv4ll_on_acd, ll); | |
102 | if (r < 0) | |
103 | return r; | |
104 | ||
1cc6c93a | 105 | *ret = TAKE_PTR(ll); |
b45e4eb6 TG |
106 | |
107 | return 0; | |
108 | } | |
109 | ||
b45e4eb6 | 110 | int sd_ipv4ll_stop(sd_ipv4ll *ll) { |
e3dca008 | 111 | assert_return(ll, -EINVAL); |
94a355a1 | 112 | |
96a7979f | 113 | return sd_ipv4acd_stop(ll->acd); |
5c1d3fc9 UTL |
114 | } |
115 | ||
2f8e7633 | 116 | int sd_ipv4ll_set_ifindex(sd_ipv4ll *ll, int ifindex) { |
e3dca008 | 117 | assert_return(ll, -EINVAL); |
2f8e7633 | 118 | assert_return(ifindex > 0, -EINVAL); |
96a7979f | 119 | assert_return(sd_ipv4ll_is_running(ll) == 0, -EBUSY); |
5c1d3fc9 | 120 | |
2f8e7633 | 121 | return sd_ipv4acd_set_ifindex(ll->acd, ifindex); |
5c1d3fc9 UTL |
122 | } |
123 | ||
e3dca008 | 124 | int sd_ipv4ll_set_mac(sd_ipv4ll *ll, const struct ether_addr *addr) { |
b26f7e8e TG |
125 | int r; |
126 | ||
e3dca008 | 127 | assert_return(ll, -EINVAL); |
96a7979f LP |
128 | assert_return(addr, -EINVAL); |
129 | assert_return(sd_ipv4ll_is_running(ll) == 0, -EBUSY); | |
b26f7e8e | 130 | |
96a7979f LP |
131 | r = sd_ipv4acd_set_mac(ll->acd, addr); |
132 | if (r < 0) | |
133 | return r; | |
5c1d3fc9 | 134 | |
96a7979f LP |
135 | ll->mac = *addr; |
136 | return 0; | |
5c1d3fc9 UTL |
137 | } |
138 | ||
139 | int sd_ipv4ll_detach_event(sd_ipv4ll *ll) { | |
140 | assert_return(ll, -EINVAL); | |
141 | ||
e3dca008 | 142 | return sd_ipv4acd_detach_event(ll->acd); |
5c1d3fc9 UTL |
143 | } |
144 | ||
32d20645 | 145 | int sd_ipv4ll_attach_event(sd_ipv4ll *ll, sd_event *event, int64_t priority) { |
5c1d3fc9 | 146 | assert_return(ll, -EINVAL); |
5c1d3fc9 | 147 | |
73e94c0d | 148 | return sd_ipv4acd_attach_event(ll->acd, event, priority); |
5c1d3fc9 UTL |
149 | } |
150 | ||
ccf86354 | 151 | int sd_ipv4ll_set_callback(sd_ipv4ll *ll, sd_ipv4ll_callback_t cb, void *userdata) { |
5c1d3fc9 UTL |
152 | assert_return(ll, -EINVAL); |
153 | ||
45aa74c7 | 154 | ll->callback = cb; |
5c1d3fc9 UTL |
155 | ll->userdata = userdata; |
156 | ||
157 | return 0; | |
158 | } | |
159 | ||
9ed794a3 | 160 | int sd_ipv4ll_get_address(sd_ipv4ll *ll, struct in_addr *address) { |
5c1d3fc9 UTL |
161 | assert_return(ll, -EINVAL); |
162 | assert_return(address, -EINVAL); | |
163 | ||
ece174c5 | 164 | if (ll->claimed_address == 0) |
5c1d3fc9 | 165 | return -ENOENT; |
5c1d3fc9 UTL |
166 | |
167 | address->s_addr = ll->claimed_address; | |
e3dca008 | 168 | |
5c1d3fc9 UTL |
169 | return 0; |
170 | } | |
171 | ||
38958cd6 | 172 | int sd_ipv4ll_set_address_seed(sd_ipv4ll *ll, uint64_t seed) { |
b5db00e5 | 173 | assert_return(ll, -EINVAL); |
96a7979f | 174 | assert_return(sd_ipv4ll_is_running(ll) == 0, -EBUSY); |
d9bf4f8c | 175 | |
96a7979f LP |
176 | ll->seed.value = htole64(seed); |
177 | ll->seed_set = true; | |
b5db00e5 | 178 | |
e3dca008 | 179 | return 0; |
b5db00e5 UTL |
180 | } |
181 | ||
04c01369 | 182 | int sd_ipv4ll_is_running(sd_ipv4ll *ll) { |
75677581 | 183 | assert_return(ll, false); |
aba496a5 | 184 | |
e3dca008 | 185 | return sd_ipv4acd_is_running(ll->acd); |
aba496a5 UTL |
186 | } |
187 | ||
129dc1b4 | 188 | static bool ipv4ll_address_is_valid(const struct in_addr *address) { |
129dc1b4 TG |
189 | assert(address); |
190 | ||
191 | if (!in_addr_is_link_local(AF_INET, (const union in_addr_union *) address)) | |
192 | return false; | |
193 | ||
ae06d1be | 194 | return !IN_SET(be32toh(address->s_addr) & 0x0000FF00U, 0x0000U, 0xFF00U); |
129dc1b4 TG |
195 | } |
196 | ||
197 | int sd_ipv4ll_set_address(sd_ipv4ll *ll, const struct in_addr *address) { | |
198 | int r; | |
199 | ||
200 | assert_return(ll, -EINVAL); | |
201 | assert_return(address, -EINVAL); | |
202 | assert_return(ipv4ll_address_is_valid(address), -EINVAL); | |
203 | ||
204 | r = sd_ipv4acd_set_address(ll->acd, address); | |
205 | if (r < 0) | |
206 | return r; | |
207 | ||
208 | ll->address = address->s_addr; | |
209 | ||
210 | return 0; | |
211 | } | |
212 | ||
96a7979f LP |
213 | #define PICK_HASH_KEY SD_ID128_MAKE(15,ac,82,a6,d6,3f,49,78,98,77,5d,0c,69,02,94,0b) |
214 | ||
e3dca008 | 215 | static int ipv4ll_pick_address(sd_ipv4ll *ll) { |
703945c1 | 216 | _cleanup_free_ char *address = NULL; |
e3dca008 | 217 | be32_t addr; |
5c1d3fc9 | 218 | |
e3dca008 | 219 | assert(ll); |
4d978a46 | 220 | |
e3dca008 | 221 | do { |
96a7979f | 222 | uint64_t h; |
5c1d3fc9 | 223 | |
96a7979f | 224 | h = siphash24(&ll->seed, sizeof(ll->seed), PICK_HASH_KEY.bytes); |
5c1d3fc9 | 225 | |
96a7979f LP |
226 | /* Increase the generation counter by one */ |
227 | ll->seed.generation = htole64(le64toh(ll->seed.generation) + 1); | |
b5db00e5 | 228 | |
96a7979f LP |
229 | addr = htobe32((h & UINT32_C(0x0000FFFF)) | IPV4LL_NETWORK); |
230 | } while (addr == ll->address || | |
ae06d1be | 231 | IN_SET(be32toh(addr) & 0x0000FF00U, 0x0000U, 0xFF00U)); |
96a7979f | 232 | |
703945c1 LP |
233 | (void) in_addr_to_string(AF_INET, &(union in_addr_union) { .in.s_addr = addr }, &address); |
234 | log_ipv4ll(ll, "Picked new IP address %s.", strna(address)); | |
235 | ||
96a7979f | 236 | return sd_ipv4ll_set_address(ll, &(struct in_addr) { addr }); |
e3dca008 TG |
237 | } |
238 | ||
5e25a13a JR |
239 | int sd_ipv4ll_restart(sd_ipv4ll *ll) { |
240 | ll->address = 0; | |
241 | ||
242 | return sd_ipv4ll_start(ll); | |
243 | } | |
244 | ||
96a7979f LP |
245 | #define MAC_HASH_KEY SD_ID128_MAKE(df,04,22,98,3f,ad,14,52,f9,87,2e,d1,9c,70,e2,f2) |
246 | ||
e3dca008 TG |
247 | int sd_ipv4ll_start(sd_ipv4ll *ll) { |
248 | int r; | |
96a7979f | 249 | bool picked_address = false; |
e3dca008 TG |
250 | |
251 | assert_return(ll, -EINVAL); | |
96a7979f LP |
252 | assert_return(!ether_addr_is_null(&ll->mac), -EINVAL); |
253 | assert_return(sd_ipv4ll_is_running(ll) == 0, -EBUSY); | |
254 | ||
255 | /* If no random seed is set, generate some from the MAC address */ | |
256 | if (!ll->seed_set) | |
257 | ll->seed.value = htole64(siphash24(ll->mac.ether_addr_octet, ETH_ALEN, MAC_HASH_KEY.bytes)); | |
258 | ||
259 | /* Restart the generation counter. */ | |
260 | ll->seed.generation = 0; | |
b5db00e5 UTL |
261 | |
262 | if (ll->address == 0) { | |
e3dca008 | 263 | r = ipv4ll_pick_address(ll); |
b5db00e5 | 264 | if (r < 0) |
e3dca008 | 265 | return r; |
96a7979f LP |
266 | |
267 | picked_address = true; | |
b5db00e5 | 268 | } |
5c1d3fc9 | 269 | |
e3dca008 | 270 | r = sd_ipv4acd_start(ll->acd); |
96a7979f LP |
271 | if (r < 0) { |
272 | ||
273 | /* We couldn't start? If so, let's forget the picked address again, the user might make a change and | |
274 | * retry, and we want the new data to take effect when picking an address. */ | |
275 | if (picked_address) | |
276 | ll->address = 0; | |
277 | ||
e3dca008 | 278 | return r; |
96a7979f | 279 | } |
996d1697 | 280 | |
e3dca008 TG |
281 | return 0; |
282 | } | |
996d1697 | 283 | |
e3dca008 TG |
284 | static void ipv4ll_client_notify(sd_ipv4ll *ll, int event) { |
285 | assert(ll); | |
5c1d3fc9 | 286 | |
45aa74c7 LP |
287 | if (ll->callback) |
288 | ll->callback(ll, event, ll->userdata); | |
e3dca008 | 289 | } |
5c1d3fc9 | 290 | |
e3dca008 TG |
291 | void ipv4ll_on_acd(sd_ipv4acd *acd, int event, void *userdata) { |
292 | sd_ipv4ll *ll = userdata; | |
293 | IPV4LL_DONT_DESTROY(ll); | |
294 | int r; | |
5c1d3fc9 | 295 | |
e3dca008 TG |
296 | assert(acd); |
297 | assert(ll); | |
9021bb9f | 298 | |
e3dca008 | 299 | switch (event) { |
73e94c0d | 300 | |
2237aa02 | 301 | case SD_IPV4ACD_EVENT_STOP: |
be19c5b5 | 302 | ipv4ll_client_notify(ll, SD_IPV4LL_EVENT_STOP); |
e3dca008 | 303 | ll->claimed_address = 0; |
e3dca008 | 304 | break; |
73e94c0d | 305 | |
2237aa02 | 306 | case SD_IPV4ACD_EVENT_BIND: |
e3dca008 | 307 | ll->claimed_address = ll->address; |
be19c5b5 | 308 | ipv4ll_client_notify(ll, SD_IPV4LL_EVENT_BIND); |
e3dca008 | 309 | break; |
73e94c0d | 310 | |
2237aa02 | 311 | case SD_IPV4ACD_EVENT_CONFLICT: |
e3dca008 TG |
312 | /* if an address was already bound we must call up to the |
313 | user to handle this, otherwise we just try again */ | |
314 | if (ll->claimed_address != 0) { | |
be19c5b5 | 315 | ipv4ll_client_notify(ll, SD_IPV4LL_EVENT_CONFLICT); |
e3dca008 TG |
316 | |
317 | ll->claimed_address = 0; | |
318 | } else { | |
319 | r = ipv4ll_pick_address(ll); | |
320 | if (r < 0) | |
321 | goto error; | |
322 | ||
323 | r = sd_ipv4acd_start(ll->acd); | |
324 | if (r < 0) | |
325 | goto error; | |
326 | } | |
327 | ||
328 | break; | |
96a7979f | 329 | |
e3dca008 TG |
330 | default: |
331 | assert_not_reached("Invalid IPv4ACD event."); | |
332 | } | |
333 | ||
334 | return; | |
335 | ||
336 | error: | |
be19c5b5 | 337 | ipv4ll_client_notify(ll, SD_IPV4LL_EVENT_STOP); |
5c1d3fc9 | 338 | } |