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5435a2bf QY |
1 | /* |
2 | * VRRPD global definitions | |
3 | * Copyright (C) 2018 Cumulus Networks, Inc. | |
4 | * Quentin Young | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the Free | |
8 | * Software Foundation; either version 2 of the License, or (at your option) | |
9 | * any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
14 | * more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License along | |
17 | * with this program; see the file COPYING; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
41ee5442 QY |
20 | #include <zebra.h> |
21 | ||
5435a2bf QY |
22 | #include "memory.h" |
23 | #include "if.h" | |
24 | #include "linklist.h" | |
25 | #include "prefix.h" | |
26 | #include "hash.h" | |
27 | #include "vrf.h" | |
28 | #include "hook.h" | |
29 | ||
30 | #include "vrrp.h" | |
31 | ||
32 | /* Utility functions ------------------------------------------------------- */ | |
33 | ||
34 | /* | |
35 | * Sets an ethaddr to RFC-defined Virtual Router MAC address. | |
36 | * | |
37 | * mac | |
38 | * ethaddr to set | |
39 | * | |
40 | * v6 | |
41 | * Whether this is a V6 or V4 Virtual Router MAC | |
42 | * | |
43 | * vrid | |
44 | * Virtual Router Identifier | |
45 | */ | |
46 | static void vrrp_mac_set(struct ethaddr *mac, bool v6, uint8_t vrid) | |
47 | { | |
48 | /* | |
49 | * V4: 00-00-5E-00-01-{VRID} | |
50 | * V6: 00-00-5E-00-02-{VRID} | |
51 | */ | |
52 | mac->octet[0] = 0x00; | |
53 | mac->octet[1] = 0x00; | |
54 | mac->octet[2] = 0x5E; | |
55 | mac->octet[3] = 0x00; | |
56 | mac->octet[4] = v6 ? 0x02 : 0x01; | |
57 | mac->octet[5] = vrid; | |
58 | } | |
59 | ||
60 | /* | |
61 | * Sets advertisement_interval and master_adver_interval on a Virtual Router, | |
62 | * then recalculates and sets skew_time and master_down_interval based on these | |
63 | * values. | |
64 | * | |
65 | * vr | |
66 | * Virtual Router to operate on | |
67 | * | |
68 | * advertisement_interval | |
69 | * Advertisement_Interval to set | |
70 | * | |
71 | * master_adver_interval | |
72 | * Master_Adver_Interval to set | |
73 | */ | |
74 | static void vrrp_update_times(struct vrrp_vrouter *vr, uint16_t advertisement_interval, | |
75 | uint16_t master_adver_interval) | |
76 | { | |
77 | vr->advertisement_interval = advertisement_interval; | |
78 | vr->master_adver_interval = master_adver_interval; | |
79 | vr->skew_time = (256 - vr->priority) * vr->master_adver_interval; | |
80 | vr->skew_time /= 256; | |
81 | vr->master_down_interval = (3 * vr->master_adver_interval); | |
82 | vr->master_down_interval /= 256; | |
83 | } | |
84 | ||
85 | struct vrrp_vrouter *vrrp_vrouter_create(struct interface *ifp, uint8_t vrid) | |
86 | { | |
87 | struct vrrp_vrouter *vr = | |
88 | XCALLOC(MTYPE_TMP, sizeof(struct vrrp_vrouter)); | |
89 | ||
90 | vr->sock = -1; | |
91 | vr->ifp = ifp; | |
92 | vr->vrid = vrid; | |
93 | vr->v4 = list_new(); | |
94 | vr->v6 = list_new(); | |
95 | vr->advint = VRRP_DEFAULT_ADVINT; | |
96 | vr->is_master = false; | |
97 | vr->priority = VRRP_DEFAULT_PRIORITY; | |
98 | vr->advertisement_interval = VRRP_DEFAULT_ADVINT; | |
99 | vr->master_adver_interval = 0; | |
100 | vr->skew_time = 0; | |
101 | vr->master_down_interval = 0; | |
102 | vr->preempt_mode = true; | |
103 | vr->accept_mode = false; | |
104 | vrrp_mac_set(&vr->vr_mac_v4, false, vrid); | |
105 | vrrp_mac_set(&vr->vr_mac_v6, true, vrid); | |
106 | vr->fsm.state = VRRP_STATE_INITIALIZE; | |
107 | ||
108 | hash_get(vrrp_vrouters_hash, vr, hash_alloc_intern); | |
109 | ||
110 | return vr; | |
111 | } | |
112 | ||
113 | struct vrrp_vrouter *vrrp_lookup(uint8_t vrid) | |
114 | { | |
115 | struct vrrp_vrouter vr; | |
116 | vr.vrid = vrid; | |
117 | ||
118 | return hash_lookup(vrrp_vrouters_hash, &vr); | |
119 | } | |
120 | ||
121 | /* Network ----------------------------------------------------------------- */ | |
122 | ||
123 | /* | |
124 | * Create and broadcast VRRP ADVERTISEMENT message. | |
125 | * | |
126 | * vr | |
127 | * Virtual Router for which to send ADVERTISEMENT | |
128 | */ | |
129 | static void vrrp_send_advertisement(struct vrrp_vrouter *vr) | |
130 | { | |
131 | } | |
132 | ||
133 | /* FIXME: | |
134 | static void vrrp_recv_advertisement(struct thread *thread) | |
135 | { | |
136 | } | |
137 | */ | |
138 | ||
139 | /* | |
140 | * Create Virtual Router listen socket and join it to the VRRP multicast group. | |
141 | * | |
142 | * The first connected address on the Virtual Router's interface is used as the | |
143 | * interface address. | |
144 | * | |
145 | * vr | |
146 | * Virtual Router for which to create listen socket | |
147 | */ | |
148 | static int vrrp_socket(struct vrrp_vrouter *vr) | |
149 | { | |
150 | struct ip_mreqn req; | |
151 | int ret; | |
152 | ||
153 | vr->sock = socket(AF_INET, SOCK_RAW, IPPROTO_VRRP); | |
154 | ||
155 | if (vr->sock < 0) { | |
156 | /* FIXME */ | |
157 | } | |
158 | ||
159 | /* Join the multicast group.*/ | |
160 | ||
161 | /* FIXME: Use first address on the interface and for imr_interface */ | |
162 | struct connected *c = listhead(vr->ifp->connected)->data; | |
163 | struct in_addr v4 = c->address->u.prefix4; | |
164 | ||
165 | memset(&req, 0, sizeof(req)); | |
166 | req.imr_multiaddr.s_addr = htonl(VRRP_MCAST_GROUP_HEX); | |
167 | req.imr_address = v4; | |
168 | req.imr_ifindex = 0; // FIXME: vr->ifp->ifindex ? | |
169 | ret = setsockopt(vr->sock, IPPROTO_IP, IP_ADD_MEMBERSHIP, (char *)&req, | |
170 | sizeof(struct ip_mreq)); | |
171 | if (ret < 0) { | |
172 | // int err = errno; | |
173 | /* VRRP_LOG(("cant do IP_ADD_MEMBERSHIP errno=%d\n", err)); */ | |
174 | return -1; | |
175 | } | |
176 | return 0; | |
177 | } | |
178 | ||
179 | ||
180 | /* State machine ----------------------------------------------------------- */ | |
181 | ||
182 | DEFINE_HOOK(vrrp_change_state_hook, (struct vrrp_vrouter *vr, int to), (vr, to)); | |
183 | ||
184 | /* | |
185 | * Handle any necessary actions during state change to MASTER state. | |
186 | * | |
187 | * vr | |
188 | * Virtual Router to operate on | |
189 | */ | |
190 | static void vrrp_change_state_master(struct vrrp_vrouter *vr) | |
191 | { | |
192 | } | |
193 | ||
194 | /* | |
195 | * Handle any necessary actions during state change to BACKUP state. | |
196 | * | |
197 | * vr | |
198 | * Virtual Router to operate on | |
199 | */ | |
200 | static void vrrp_change_state_backup(struct vrrp_vrouter *vr) | |
201 | { | |
202 | /* Uninstall ARP entry for vrouter MAC */ | |
203 | /* ... */ | |
204 | } | |
205 | ||
206 | /* | |
207 | * Handle any necessary actions during state change to INITIALIZE state. | |
208 | * | |
209 | * This is not called for initial startup, only when transitioning from MASTER | |
210 | * or BACKUP. | |
211 | * | |
212 | * vr | |
213 | * Virtual Router to operate on | |
214 | */ | |
215 | static void vrrp_change_state_initialize(struct vrrp_vrouter *vr) | |
216 | { | |
217 | } | |
218 | ||
219 | void (*vrrp_change_state_handlers[])(struct vrrp_vrouter *vr) = { | |
220 | [VRRP_STATE_MASTER] = vrrp_change_state_master, | |
221 | [VRRP_STATE_BACKUP] = vrrp_change_state_backup, | |
222 | [VRRP_STATE_INITIALIZE] = vrrp_change_state_initialize, | |
223 | }; | |
224 | ||
225 | /* | |
226 | * Change Virtual Router FSM position. Handles transitional actions and calls | |
227 | * any subscribers to the state change hook. | |
228 | * | |
229 | * vr | |
230 | * Virtual Router for which to change state | |
231 | * | |
232 | * to | |
233 | * State to change to | |
234 | */ | |
235 | static void vrrp_change_state(struct vrrp_vrouter *vr, int to) | |
236 | { | |
237 | /* Call our handlers, then any subscribers */ | |
238 | vrrp_change_state_handlers[to](vr); | |
239 | hook_call(vrrp_change_state_hook, vr, to); | |
240 | vr->fsm.state = to; | |
241 | } | |
242 | ||
243 | /* | |
244 | * Called when Adver_Timer expires. | |
245 | */ | |
246 | static int vrrp_adver_timer_expire(struct thread *thread) | |
247 | { | |
248 | struct vrrp_vrouter *vr = thread->arg; | |
249 | ||
250 | if (vr->fsm.state == VRRP_STATE_BACKUP) { | |
251 | vrrp_send_advertisement(vr); | |
252 | /* FIXME: vrrp_send_gratuitous_arp(vr); */ | |
253 | } else if (vr->fsm.state == VRRP_STATE_MASTER) { | |
254 | ||
255 | } else if (vr->fsm.state == VRRP_STATE_INITIALIZE) { | |
256 | assert(!"FUCK"); | |
257 | } | |
258 | return 0; | |
259 | } | |
260 | ||
261 | /* | |
262 | * Called when Master_Down timer expires. | |
263 | */ | |
264 | static int vrrp_master_down_timer_expire(struct thread *thread) | |
265 | { | |
266 | /* struct vrrp_vrouter *vr = thread->arg; */ | |
267 | ||
268 | return 0; | |
269 | } | |
270 | ||
271 | /* | |
272 | * Event handler for Startup event. | |
273 | * | |
274 | * Creates sockets, sends advertisements and ARP requests, starts timers, | |
275 | * updates state machine. | |
276 | * | |
277 | * vr | |
278 | * Virtual Router on which to apply Startup event | |
279 | */ | |
280 | static void vrrp_startup(struct vrrp_vrouter *vr) | |
281 | { | |
282 | /* Create socket */ | |
283 | vrrp_socket(vr); | |
284 | ||
285 | /* Schedule listener */ | |
286 | /* ... */ | |
287 | ||
288 | if (vr->priority == VRRP_PRIO_MASTER) { | |
289 | vrrp_send_advertisement(vr); | |
290 | /* FIXME: vrrp_send_gratuitous_arp(vr); */ | |
291 | ||
292 | thread_add_timer_msec(master, vrrp_adver_timer_expire, vr, | |
293 | vr->advertisement_interval * 10, | |
294 | &vr->t_adver_timer); | |
295 | vrrp_change_state(vr, VRRP_STATE_MASTER); | |
296 | } else { | |
297 | vrrp_update_times(vr, vr->advertisement_interval, | |
298 | vr->advertisement_interval); | |
299 | thread_add_timer_msec(master, vrrp_master_down_timer_expire, vr, | |
300 | vr->master_down_interval * 10, | |
301 | &vr->t_master_down_timer); | |
302 | vrrp_change_state(vr, VRRP_STATE_BACKUP); | |
303 | } | |
304 | } | |
305 | ||
306 | static void vrrp_shutdown(struct vrrp_vrouter *vr) | |
307 | { | |
308 | /* NOTHING */ | |
309 | } | |
310 | ||
311 | static void (*vrrp_event_handlers[])(struct vrrp_vrouter *vr) = { | |
312 | [VRRP_EVENT_STARTUP] = vrrp_startup, | |
313 | [VRRP_EVENT_SHUTDOWN] = vrrp_shutdown, | |
314 | }; | |
315 | ||
316 | /* | |
317 | * Spawn a VRRP FSM event on a Virtual Router. | |
318 | * | |
319 | * vr | |
320 | * Virtual Router on which to spawn event | |
321 | * | |
322 | * event | |
323 | * The event to spawn | |
324 | */ | |
325 | void vrrp_event(struct vrrp_vrouter *vr, int event) | |
326 | { | |
327 | vrrp_event_handlers[event](vr); | |
328 | } | |
329 | ||
330 | ||
331 | /* Other ------------------------------------------------------------------- */ | |
332 | ||
333 | static unsigned int vrrp_hash_key(void *arg) | |
334 | { | |
335 | struct vrrp_vrouter *vr = arg; | |
336 | ||
337 | return vr->vrid; | |
338 | } | |
339 | ||
340 | static bool vrrp_hash_cmp(const void *arg1, const void *arg2) | |
341 | { | |
342 | const struct vrrp_vrouter *vr1 = arg1; | |
343 | const struct vrrp_vrouter *vr2 = arg2; | |
344 | ||
345 | return vr1->vrid > vr2->vrid; | |
346 | } | |
347 | ||
348 | void vrrp_init(void) | |
349 | { | |
350 | vrrp_vrouters_hash = hash_create(&vrrp_hash_key, vrrp_hash_cmp, | |
351 | "VRRP virtual router hash"); | |
352 | vrf_init(NULL, NULL, NULL, NULL, NULL); | |
353 | } |