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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 SK |
30 | #include "libfrr.h" |
31 | #include "version.h" | |
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 | { | |
77 | uint32_t *msglen; | |
78 | uint32_t h_msglen; | |
79 | uint32_t tot_len, curr_len = mlag_rd_buf_offset; | |
80 | ||
17823cdd DS |
81 | zrouter.mlag_info.t_read = NULL; |
82 | ||
ee235396 SK |
83 | /* |
84 | * Received message in sock_stream looks like below | |
85 | * | len-1 (4 Bytes) | payload-1 (len-1) | | |
86 | * len-2 (4 Bytes) | payload-2 (len-2) | .. | |
87 | * | |
88 | * Idea is read one message completely, then process, until message is | |
89 | * read completely, keep on reading from the socket | |
90 | */ | |
91 | if (curr_len < ZEBRA_MLAG_LEN_SIZE) { | |
92 | ssize_t data_len; | |
93 | ||
94 | data_len = read(mlag_socket, mlag_rd_buffer + curr_len, | |
95 | ZEBRA_MLAG_LEN_SIZE - curr_len); | |
96 | if (data_len == 0 || data_len == -1) { | |
97 | if (IS_ZEBRA_DEBUG_MLAG) | |
98 | zlog_debug("MLAG connection closed socket : %d", | |
99 | mlag_socket); | |
100 | close(mlag_socket); | |
101 | zebra_mlag_handle_process_state(MLAG_DOWN); | |
102 | return -1; | |
103 | } | |
67fa73f2 | 104 | mlag_rd_buf_offset += data_len; |
668b6011 | 105 | if (data_len != (ssize_t)(ZEBRA_MLAG_LEN_SIZE - curr_len)) { |
ee235396 SK |
106 | /* Try again later */ |
107 | zebra_mlag_sched_read(); | |
108 | return 0; | |
109 | } | |
110 | curr_len = ZEBRA_MLAG_LEN_SIZE; | |
111 | } | |
112 | ||
113 | /* Get the actual packet length */ | |
114 | msglen = (uint32_t *)mlag_rd_buffer; | |
115 | h_msglen = ntohl(*msglen); | |
116 | ||
117 | /* This will be the actual length of the packet */ | |
118 | tot_len = h_msglen + ZEBRA_MLAG_LEN_SIZE; | |
119 | ||
120 | if (curr_len < tot_len) { | |
121 | ssize_t data_len; | |
122 | ||
123 | data_len = read(mlag_socket, mlag_rd_buffer + curr_len, | |
124 | tot_len - curr_len); | |
125 | if (data_len == 0 || data_len == -1) { | |
126 | if (IS_ZEBRA_DEBUG_MLAG) | |
127 | zlog_debug("MLAG connection closed socket : %d", | |
128 | mlag_socket); | |
129 | close(mlag_socket); | |
130 | zebra_mlag_handle_process_state(MLAG_DOWN); | |
131 | return -1; | |
132 | } | |
67fa73f2 | 133 | mlag_rd_buf_offset += data_len; |
668b6011 | 134 | if (data_len != (ssize_t)(tot_len - curr_len)) { |
ee235396 SK |
135 | /* Try again later */ |
136 | zebra_mlag_sched_read(); | |
137 | return 0; | |
138 | } | |
139 | } | |
140 | ||
141 | if (IS_ZEBRA_DEBUG_MLAG) { | |
142 | zlog_debug("Received a MLAG Message from socket: %d, len:%u ", | |
143 | mlag_socket, tot_len); | |
144 | zlog_hexdump(mlag_rd_buffer, tot_len); | |
145 | } | |
146 | ||
147 | tot_len -= ZEBRA_MLAG_LEN_SIZE; | |
148 | ||
149 | /* Process the packet */ | |
150 | zebra_mlag_process_mlag_data(mlag_rd_buffer + ZEBRA_MLAG_LEN_SIZE, | |
151 | tot_len); | |
152 | ||
153 | /* Register read thread. */ | |
154 | zebra_mlag_reset_read_buffer(); | |
155 | zebra_mlag_sched_read(); | |
156 | return 0; | |
157 | } | |
158 | ||
159 | static int zebra_mlag_connect(struct thread *thread) | |
160 | { | |
161 | struct sockaddr_un svr = {0}; | |
ee235396 SK |
162 | |
163 | /* Reset the Timer-running flag */ | |
164 | zrouter.mlag_info.timer_running = false; | |
165 | ||
ee235396 SK |
166 | svr.sun_family = AF_UNIX; |
167 | #define MLAG_SOCK_NAME "/var/run/clag-zebra.socket" | |
168 | strlcpy(svr.sun_path, MLAG_SOCK_NAME, sizeof(MLAG_SOCK_NAME) + 1); | |
169 | ||
170 | mlag_socket = socket(svr.sun_family, SOCK_STREAM, 0); | |
171 | if (mlag_socket < 0) | |
172 | return -1; | |
173 | ||
174 | if (connect(mlag_socket, (struct sockaddr *)&svr, sizeof(svr)) == -1) { | |
175 | if (IS_ZEBRA_DEBUG_MLAG) | |
176 | zlog_debug( | |
177 | "Unable to connect to %s try again in 10 secs", | |
178 | svr.sun_path); | |
179 | close(mlag_socket); | |
180 | zrouter.mlag_info.timer_running = true; | |
181 | thread_add_timer(zmlag_master, zebra_mlag_connect, NULL, 10, | |
182 | &zrouter.mlag_info.t_read); | |
183 | return 0; | |
184 | } | |
ee235396 SK |
185 | |
186 | set_nonblocking(mlag_socket); | |
ee235396 SK |
187 | |
188 | if (IS_ZEBRA_DEBUG_MLAG) | |
189 | zlog_debug("%s: Connection with MLAG is established ", | |
190 | __func__); | |
191 | ||
192 | thread_add_read(zmlag_master, zebra_mlag_read, NULL, mlag_socket, | |
193 | &zrouter.mlag_info.t_read); | |
194 | /* | |
195 | * Connection is established with MLAGD, post to clients | |
196 | */ | |
197 | zebra_mlag_handle_process_state(MLAG_UP); | |
198 | return 0; | |
199 | } | |
200 | ||
201 | /* | |
202 | * Currently we are doing polling later we will look for better options | |
203 | */ | |
d621815a | 204 | static int zebra_mlag_private_monitor_state(void) |
ee235396 SK |
205 | { |
206 | thread_add_event(zmlag_master, zebra_mlag_connect, NULL, 0, | |
207 | &zrouter.mlag_info.t_read); | |
d621815a | 208 | return 0; |
ee235396 SK |
209 | } |
210 | ||
d621815a | 211 | static int zebra_mlag_private_open_channel(void) |
ee235396 SK |
212 | { |
213 | zmlag_master = zrouter.mlag_info.th_master; | |
214 | ||
215 | if (zrouter.mlag_info.connected == true) { | |
216 | if (IS_ZEBRA_DEBUG_MLAG) | |
217 | zlog_debug("%s: Zebra already connected to MLAGD", | |
218 | __func__); | |
219 | return 0; | |
220 | } | |
221 | ||
222 | if (zrouter.mlag_info.timer_running == true) { | |
223 | if (IS_ZEBRA_DEBUG_MLAG) | |
224 | zlog_debug( | |
225 | "%s: Connection retry is in progress for MLAGD", | |
226 | __func__); | |
227 | return 0; | |
228 | } | |
229 | ||
230 | if (zrouter.mlag_info.clients_interested_cnt) { | |
231 | /* | |
232 | * Connect only if any clients are showing interest | |
233 | */ | |
234 | thread_add_event(zmlag_master, zebra_mlag_connect, NULL, 0, | |
235 | &zrouter.mlag_info.t_read); | |
236 | } | |
237 | return 0; | |
238 | } | |
239 | ||
d621815a | 240 | static int zebra_mlag_private_close_channel(void) |
ee235396 SK |
241 | { |
242 | if (zmlag_master == NULL) | |
243 | return -1; | |
244 | ||
245 | if (zrouter.mlag_info.clients_interested_cnt) { | |
246 | if (IS_ZEBRA_DEBUG_MLAG) | |
247 | zlog_debug("%s: still %d clients are connected, skip", | |
248 | __func__, | |
249 | zrouter.mlag_info.clients_interested_cnt); | |
250 | return -1; | |
251 | } | |
252 | ||
253 | /* | |
254 | * Post the De-register to MLAG, so that it can do necesasry cleanup | |
255 | */ | |
256 | zebra_mlag_send_deregister(); | |
257 | ||
258 | return 0; | |
259 | } | |
260 | ||
d621815a | 261 | static int zebra_mlag_private_cleanup_data(void) |
ee235396 SK |
262 | { |
263 | zmlag_master = NULL; | |
264 | zrouter.mlag_info.connected = false; | |
265 | zrouter.mlag_info.timer_running = false; | |
266 | ||
267 | close(mlag_socket); | |
ee235396 SK |
268 | return 0; |
269 | } | |
270 | ||
d621815a | 271 | static int zebra_mlag_module_init(void) |
ee235396 | 272 | { |
d621815a DL |
273 | hook_register(zebra_mlag_private_write_data, |
274 | zebra_mlag_private_write_data); | |
275 | hook_register(zebra_mlag_private_monitor_state, | |
276 | zebra_mlag_private_monitor_state); | |
277 | hook_register(zebra_mlag_private_open_channel, | |
278 | zebra_mlag_private_open_channel); | |
279 | hook_register(zebra_mlag_private_close_channel, | |
280 | zebra_mlag_private_close_channel); | |
281 | hook_register(zebra_mlag_private_cleanup_data, | |
282 | zebra_mlag_private_cleanup_data); | |
ee235396 SK |
283 | return 0; |
284 | } | |
285 | ||
d621815a DL |
286 | FRR_MODULE_SETUP( |
287 | .name = "zebra_cumulus_mlag", | |
288 | .version = FRR_VERSION, | |
289 | .description = "zebra Cumulus MLAG interface", | |
290 | .init = zebra_mlag_module_init, | |
291 | ) |