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ee235396 SK |
1 | /* |
2 | * This is an implementation of MLAG Functionality | |
3 | * | |
4 | * Module name: Zebra MLAG | |
5 | * | |
6 | * Author: sathesh Kumar karra <sathk@cumulusnetworks.com> | |
7 | * | |
8 | * Copyright (C) 2019 Cumulus Networks http://www.cumulusnetworks.com | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify it | |
11 | * under the terms of the GNU General Public License as published by the Free | |
12 | * Software Foundation; either version 2 of the License, or (at your option) | |
13 | * any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
16 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
17 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
18 | * more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License along | |
21 | * with this program; see the file COPYING; if not, write to the Free Software | |
22 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
23 | */ | |
24 | #include "zebra.h" | |
25 | ||
26 | #include "hook.h" | |
27 | #include "module.h" | |
28 | #include "thread.h" | |
67fa73f2 | 29 | #include "frr_pthread.h" |
ee235396 | 30 | #include "libfrr.h" |
09781197 | 31 | #include "lib/version.h" |
ee235396 SK |
32 | #include "network.h" |
33 | ||
34 | #include "lib/stream.h" | |
35 | ||
36 | #include "zebra/debug.h" | |
37 | #include "zebra/zebra_router.h" | |
38 | #include "zebra/zebra_mlag.h" | |
ee235396 SK |
39 | |
40 | #include <sys/un.h> | |
41 | ||
42 | ||
43 | /* | |
44 | * This file will have platform specific apis to communicate with MCLAG. | |
45 | * | |
46 | */ | |
47 | ||
ee235396 SK |
48 | static struct thread_master *zmlag_master; |
49 | static int mlag_socket; | |
50 | ||
51 | static int zebra_mlag_connect(struct thread *thread); | |
52 | static int zebra_mlag_read(struct thread *thread); | |
53 | ||
54 | /* | |
55 | * Write the data to MLAGD | |
56 | */ | |
d621815a | 57 | static int zebra_mlag_private_write_data(uint8_t *data, uint32_t len) |
ee235396 SK |
58 | { |
59 | int rc = 0; | |
60 | ||
61 | if (IS_ZEBRA_DEBUG_MLAG) { | |
62 | zlog_debug("%s: Writing %d length Data to clag", __func__, len); | |
63 | zlog_hexdump(data, len); | |
64 | } | |
65 | rc = write(mlag_socket, data, len); | |
66 | return rc; | |
67 | } | |
68 | ||
69 | static void zebra_mlag_sched_read(void) | |
70 | { | |
1e76492b SK |
71 | thread_add_read(zmlag_master, zebra_mlag_read, NULL, mlag_socket, |
72 | &zrouter.mlag_info.t_read); | |
ee235396 SK |
73 | } |
74 | ||
75 | static int zebra_mlag_read(struct thread *thread) | |
76 | { | |
ca349126 | 77 | static uint32_t mlag_rd_buf_offset; |
ee235396 SK |
78 | uint32_t *msglen; |
79 | uint32_t h_msglen; | |
ded3e3e3 | 80 | uint32_t tot_len, curr_len = mlag_rd_buf_offset; |
ee235396 | 81 | |
ee235396 SK |
82 | /* |
83 | * Received message in sock_stream looks like below | |
84 | * | len-1 (4 Bytes) | payload-1 (len-1) | | |
85 | * len-2 (4 Bytes) | payload-2 (len-2) | .. | |
86 | * | |
87 | * Idea is read one message completely, then process, until message is | |
88 | * read completely, keep on reading from the socket | |
89 | */ | |
90 | if (curr_len < ZEBRA_MLAG_LEN_SIZE) { | |
91 | ssize_t data_len; | |
92 | ||
93 | data_len = read(mlag_socket, mlag_rd_buffer + curr_len, | |
94 | ZEBRA_MLAG_LEN_SIZE - curr_len); | |
95 | if (data_len == 0 || data_len == -1) { | |
96 | if (IS_ZEBRA_DEBUG_MLAG) | |
97 | zlog_debug("MLAG connection closed socket : %d", | |
98 | mlag_socket); | |
99 | close(mlag_socket); | |
100 | zebra_mlag_handle_process_state(MLAG_DOWN); | |
101 | return -1; | |
102 | } | |
ded3e3e3 | 103 | mlag_rd_buf_offset += data_len; |
668b6011 | 104 | if (data_len != (ssize_t)(ZEBRA_MLAG_LEN_SIZE - curr_len)) { |
ee235396 SK |
105 | /* Try again later */ |
106 | zebra_mlag_sched_read(); | |
107 | return 0; | |
108 | } | |
109 | curr_len = ZEBRA_MLAG_LEN_SIZE; | |
110 | } | |
111 | ||
112 | /* Get the actual packet length */ | |
113 | msglen = (uint32_t *)mlag_rd_buffer; | |
114 | h_msglen = ntohl(*msglen); | |
115 | ||
116 | /* This will be the actual length of the packet */ | |
117 | tot_len = h_msglen + ZEBRA_MLAG_LEN_SIZE; | |
118 | ||
7692744f DS |
119 | /* |
120 | * If the buffer read we are about to do is too large | |
121 | * we are really really really not double plus good | |
122 | * | |
123 | * I'm not sure what to do here other than to bail | |
124 | * We'll need to revisit this in the future. | |
125 | */ | |
126 | assert(tot_len < ZEBRA_MLAG_BUF_LIMIT); | |
127 | ||
ee235396 SK |
128 | if (curr_len < tot_len) { |
129 | ssize_t data_len; | |
130 | ||
131 | data_len = read(mlag_socket, mlag_rd_buffer + curr_len, | |
132 | tot_len - curr_len); | |
133 | if (data_len == 0 || data_len == -1) { | |
134 | if (IS_ZEBRA_DEBUG_MLAG) | |
135 | zlog_debug("MLAG connection closed socket : %d", | |
136 | mlag_socket); | |
137 | close(mlag_socket); | |
138 | zebra_mlag_handle_process_state(MLAG_DOWN); | |
139 | return -1; | |
140 | } | |
ded3e3e3 | 141 | mlag_rd_buf_offset += data_len; |
668b6011 | 142 | if (data_len != (ssize_t)(tot_len - curr_len)) { |
ee235396 SK |
143 | /* Try again later */ |
144 | zebra_mlag_sched_read(); | |
145 | return 0; | |
146 | } | |
147 | } | |
148 | ||
149 | if (IS_ZEBRA_DEBUG_MLAG) { | |
150 | zlog_debug("Received a MLAG Message from socket: %d, len:%u ", | |
151 | mlag_socket, tot_len); | |
152 | zlog_hexdump(mlag_rd_buffer, tot_len); | |
153 | } | |
154 | ||
155 | tot_len -= ZEBRA_MLAG_LEN_SIZE; | |
156 | ||
157 | /* Process the packet */ | |
158 | zebra_mlag_process_mlag_data(mlag_rd_buffer + ZEBRA_MLAG_LEN_SIZE, | |
159 | tot_len); | |
160 | ||
161 | /* Register read thread. */ | |
162 | zebra_mlag_reset_read_buffer(); | |
ca349126 | 163 | mlag_rd_buf_offset = 0; |
ee235396 SK |
164 | zebra_mlag_sched_read(); |
165 | return 0; | |
166 | } | |
167 | ||
168 | static int zebra_mlag_connect(struct thread *thread) | |
169 | { | |
170 | struct sockaddr_un svr = {0}; | |
ee235396 SK |
171 | |
172 | /* Reset the Timer-running flag */ | |
173 | zrouter.mlag_info.timer_running = false; | |
174 | ||
ee235396 SK |
175 | svr.sun_family = AF_UNIX; |
176 | #define MLAG_SOCK_NAME "/var/run/clag-zebra.socket" | |
177 | strlcpy(svr.sun_path, MLAG_SOCK_NAME, sizeof(MLAG_SOCK_NAME) + 1); | |
178 | ||
179 | mlag_socket = socket(svr.sun_family, SOCK_STREAM, 0); | |
180 | if (mlag_socket < 0) | |
181 | return -1; | |
182 | ||
183 | if (connect(mlag_socket, (struct sockaddr *)&svr, sizeof(svr)) == -1) { | |
184 | if (IS_ZEBRA_DEBUG_MLAG) | |
185 | zlog_debug( | |
186 | "Unable to connect to %s try again in 10 secs", | |
187 | svr.sun_path); | |
188 | close(mlag_socket); | |
189 | zrouter.mlag_info.timer_running = true; | |
190 | thread_add_timer(zmlag_master, zebra_mlag_connect, NULL, 10, | |
191 | &zrouter.mlag_info.t_read); | |
192 | return 0; | |
193 | } | |
ee235396 SK |
194 | |
195 | set_nonblocking(mlag_socket); | |
ee235396 SK |
196 | |
197 | if (IS_ZEBRA_DEBUG_MLAG) | |
198 | zlog_debug("%s: Connection with MLAG is established ", | |
199 | __func__); | |
200 | ||
201 | thread_add_read(zmlag_master, zebra_mlag_read, NULL, mlag_socket, | |
202 | &zrouter.mlag_info.t_read); | |
203 | /* | |
204 | * Connection is established with MLAGD, post to clients | |
205 | */ | |
206 | zebra_mlag_handle_process_state(MLAG_UP); | |
207 | return 0; | |
208 | } | |
209 | ||
210 | /* | |
211 | * Currently we are doing polling later we will look for better options | |
212 | */ | |
d621815a | 213 | static int zebra_mlag_private_monitor_state(void) |
ee235396 SK |
214 | { |
215 | thread_add_event(zmlag_master, zebra_mlag_connect, NULL, 0, | |
216 | &zrouter.mlag_info.t_read); | |
d621815a | 217 | return 0; |
ee235396 SK |
218 | } |
219 | ||
d621815a | 220 | static int zebra_mlag_private_open_channel(void) |
ee235396 SK |
221 | { |
222 | zmlag_master = zrouter.mlag_info.th_master; | |
223 | ||
224 | if (zrouter.mlag_info.connected == true) { | |
225 | if (IS_ZEBRA_DEBUG_MLAG) | |
226 | zlog_debug("%s: Zebra already connected to MLAGD", | |
227 | __func__); | |
228 | return 0; | |
229 | } | |
230 | ||
231 | if (zrouter.mlag_info.timer_running == true) { | |
232 | if (IS_ZEBRA_DEBUG_MLAG) | |
233 | zlog_debug( | |
234 | "%s: Connection retry is in progress for MLAGD", | |
235 | __func__); | |
236 | return 0; | |
237 | } | |
238 | ||
239 | if (zrouter.mlag_info.clients_interested_cnt) { | |
240 | /* | |
241 | * Connect only if any clients are showing interest | |
242 | */ | |
243 | thread_add_event(zmlag_master, zebra_mlag_connect, NULL, 0, | |
244 | &zrouter.mlag_info.t_read); | |
245 | } | |
246 | return 0; | |
247 | } | |
248 | ||
d621815a | 249 | static int zebra_mlag_private_close_channel(void) |
ee235396 SK |
250 | { |
251 | if (zmlag_master == NULL) | |
252 | return -1; | |
253 | ||
254 | if (zrouter.mlag_info.clients_interested_cnt) { | |
255 | if (IS_ZEBRA_DEBUG_MLAG) | |
256 | zlog_debug("%s: still %d clients are connected, skip", | |
257 | __func__, | |
258 | zrouter.mlag_info.clients_interested_cnt); | |
259 | return -1; | |
260 | } | |
261 | ||
262 | /* | |
263 | * Post the De-register to MLAG, so that it can do necesasry cleanup | |
264 | */ | |
265 | zebra_mlag_send_deregister(); | |
266 | ||
267 | return 0; | |
268 | } | |
269 | ||
d621815a | 270 | static int zebra_mlag_private_cleanup_data(void) |
ee235396 SK |
271 | { |
272 | zmlag_master = NULL; | |
273 | zrouter.mlag_info.connected = false; | |
274 | zrouter.mlag_info.timer_running = false; | |
275 | ||
276 | close(mlag_socket); | |
ee235396 SK |
277 | return 0; |
278 | } | |
279 | ||
d621815a | 280 | static int zebra_mlag_module_init(void) |
ee235396 | 281 | { |
d621815a DL |
282 | hook_register(zebra_mlag_private_write_data, |
283 | zebra_mlag_private_write_data); | |
284 | hook_register(zebra_mlag_private_monitor_state, | |
285 | zebra_mlag_private_monitor_state); | |
286 | hook_register(zebra_mlag_private_open_channel, | |
287 | zebra_mlag_private_open_channel); | |
288 | hook_register(zebra_mlag_private_close_channel, | |
289 | zebra_mlag_private_close_channel); | |
290 | hook_register(zebra_mlag_private_cleanup_data, | |
291 | zebra_mlag_private_cleanup_data); | |
ee235396 SK |
292 | return 0; |
293 | } | |
294 | ||
d621815a DL |
295 | FRR_MODULE_SETUP( |
296 | .name = "zebra_cumulus_mlag", | |
297 | .version = FRR_VERSION, | |
298 | .description = "zebra Cumulus MLAG interface", | |
299 | .init = zebra_mlag_module_init, | |
80413c20 | 300 | ); |