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acddc0ed | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
ee235396 SK |
2 | /* |
3 | * This is an implementation of MLAG Functionality | |
4 | * | |
5 | * Module name: Zebra MLAG | |
6 | * | |
7 | * Author: sathesh Kumar karra <sathk@cumulusnetworks.com> | |
8 | * | |
9 | * Copyright (C) 2019 Cumulus Networks http://www.cumulusnetworks.com | |
ee235396 SK |
10 | */ |
11 | #include "zebra.h" | |
12 | ||
13 | #include "hook.h" | |
14 | #include "module.h" | |
24a58196 | 15 | #include "frrevent.h" |
67fa73f2 | 16 | #include "frr_pthread.h" |
ee235396 | 17 | #include "libfrr.h" |
09781197 | 18 | #include "lib/version.h" |
ee235396 SK |
19 | #include "network.h" |
20 | ||
21 | #include "lib/stream.h" | |
22 | ||
23 | #include "zebra/debug.h" | |
24 | #include "zebra/zebra_router.h" | |
25 | #include "zebra/zebra_mlag.h" | |
ee235396 SK |
26 | |
27 | #include <sys/un.h> | |
28 | ||
29 | ||
30 | /* | |
31 | * This file will have platform specific apis to communicate with MCLAG. | |
32 | * | |
33 | */ | |
34 | ||
cd9d0537 | 35 | static struct event_loop *zmlag_master; |
ee235396 SK |
36 | static int mlag_socket; |
37 | ||
e6685141 DS |
38 | static void zebra_mlag_connect(struct event *thread); |
39 | static void zebra_mlag_read(struct event *thread); | |
ee235396 SK |
40 | |
41 | /* | |
42 | * Write the data to MLAGD | |
43 | */ | |
d621815a | 44 | static int zebra_mlag_private_write_data(uint8_t *data, uint32_t len) |
ee235396 SK |
45 | { |
46 | int rc = 0; | |
47 | ||
48 | if (IS_ZEBRA_DEBUG_MLAG) { | |
49 | zlog_debug("%s: Writing %d length Data to clag", __func__, len); | |
50 | zlog_hexdump(data, len); | |
51 | } | |
52 | rc = write(mlag_socket, data, len); | |
53 | return rc; | |
54 | } | |
55 | ||
56 | static void zebra_mlag_sched_read(void) | |
57 | { | |
907a2395 DS |
58 | event_add_read(zmlag_master, zebra_mlag_read, NULL, mlag_socket, |
59 | &zrouter.mlag_info.t_read); | |
ee235396 SK |
60 | } |
61 | ||
e6685141 | 62 | static void zebra_mlag_read(struct event *thread) |
ee235396 | 63 | { |
ca349126 | 64 | static uint32_t mlag_rd_buf_offset; |
ee235396 SK |
65 | uint32_t *msglen; |
66 | uint32_t h_msglen; | |
ded3e3e3 | 67 | uint32_t tot_len, curr_len = mlag_rd_buf_offset; |
ee235396 | 68 | |
ee235396 SK |
69 | /* |
70 | * Received message in sock_stream looks like below | |
71 | * | len-1 (4 Bytes) | payload-1 (len-1) | | |
72 | * len-2 (4 Bytes) | payload-2 (len-2) | .. | |
73 | * | |
74 | * Idea is read one message completely, then process, until message is | |
75 | * read completely, keep on reading from the socket | |
76 | */ | |
77 | if (curr_len < ZEBRA_MLAG_LEN_SIZE) { | |
78 | ssize_t data_len; | |
79 | ||
80 | data_len = read(mlag_socket, mlag_rd_buffer + curr_len, | |
81 | ZEBRA_MLAG_LEN_SIZE - curr_len); | |
82 | if (data_len == 0 || data_len == -1) { | |
83 | if (IS_ZEBRA_DEBUG_MLAG) | |
84 | zlog_debug("MLAG connection closed socket : %d", | |
85 | mlag_socket); | |
86 | close(mlag_socket); | |
87 | zebra_mlag_handle_process_state(MLAG_DOWN); | |
cc9f21da | 88 | return; |
ee235396 | 89 | } |
ded3e3e3 | 90 | mlag_rd_buf_offset += data_len; |
668b6011 | 91 | if (data_len != (ssize_t)(ZEBRA_MLAG_LEN_SIZE - curr_len)) { |
ee235396 SK |
92 | /* Try again later */ |
93 | zebra_mlag_sched_read(); | |
cc9f21da | 94 | return; |
ee235396 SK |
95 | } |
96 | curr_len = ZEBRA_MLAG_LEN_SIZE; | |
97 | } | |
98 | ||
99 | /* Get the actual packet length */ | |
100 | msglen = (uint32_t *)mlag_rd_buffer; | |
101 | h_msglen = ntohl(*msglen); | |
102 | ||
103 | /* This will be the actual length of the packet */ | |
104 | tot_len = h_msglen + ZEBRA_MLAG_LEN_SIZE; | |
105 | ||
7692744f DS |
106 | /* |
107 | * If the buffer read we are about to do is too large | |
108 | * we are really really really not double plus good | |
109 | * | |
110 | * I'm not sure what to do here other than to bail | |
111 | * We'll need to revisit this in the future. | |
112 | */ | |
113 | assert(tot_len < ZEBRA_MLAG_BUF_LIMIT); | |
114 | ||
ee235396 SK |
115 | if (curr_len < tot_len) { |
116 | ssize_t data_len; | |
117 | ||
118 | data_len = read(mlag_socket, mlag_rd_buffer + curr_len, | |
119 | tot_len - curr_len); | |
120 | if (data_len == 0 || data_len == -1) { | |
121 | if (IS_ZEBRA_DEBUG_MLAG) | |
122 | zlog_debug("MLAG connection closed socket : %d", | |
123 | mlag_socket); | |
124 | close(mlag_socket); | |
125 | zebra_mlag_handle_process_state(MLAG_DOWN); | |
cc9f21da | 126 | return; |
ee235396 | 127 | } |
ded3e3e3 | 128 | mlag_rd_buf_offset += data_len; |
668b6011 | 129 | if (data_len != (ssize_t)(tot_len - curr_len)) { |
ee235396 SK |
130 | /* Try again later */ |
131 | zebra_mlag_sched_read(); | |
cc9f21da | 132 | return; |
ee235396 SK |
133 | } |
134 | } | |
135 | ||
136 | if (IS_ZEBRA_DEBUG_MLAG) { | |
137 | zlog_debug("Received a MLAG Message from socket: %d, len:%u ", | |
138 | mlag_socket, tot_len); | |
139 | zlog_hexdump(mlag_rd_buffer, tot_len); | |
140 | } | |
141 | ||
142 | tot_len -= ZEBRA_MLAG_LEN_SIZE; | |
143 | ||
144 | /* Process the packet */ | |
145 | zebra_mlag_process_mlag_data(mlag_rd_buffer + ZEBRA_MLAG_LEN_SIZE, | |
146 | tot_len); | |
147 | ||
148 | /* Register read thread. */ | |
149 | zebra_mlag_reset_read_buffer(); | |
ca349126 | 150 | mlag_rd_buf_offset = 0; |
ee235396 | 151 | zebra_mlag_sched_read(); |
ee235396 SK |
152 | } |
153 | ||
e6685141 | 154 | static void zebra_mlag_connect(struct event *thread) |
ee235396 SK |
155 | { |
156 | struct sockaddr_un svr = {0}; | |
ee235396 SK |
157 | |
158 | /* Reset the Timer-running flag */ | |
159 | zrouter.mlag_info.timer_running = false; | |
160 | ||
ee235396 SK |
161 | svr.sun_family = AF_UNIX; |
162 | #define MLAG_SOCK_NAME "/var/run/clag-zebra.socket" | |
163 | strlcpy(svr.sun_path, MLAG_SOCK_NAME, sizeof(MLAG_SOCK_NAME) + 1); | |
164 | ||
165 | mlag_socket = socket(svr.sun_family, SOCK_STREAM, 0); | |
166 | if (mlag_socket < 0) | |
cc9f21da | 167 | return; |
ee235396 SK |
168 | |
169 | if (connect(mlag_socket, (struct sockaddr *)&svr, sizeof(svr)) == -1) { | |
170 | if (IS_ZEBRA_DEBUG_MLAG) | |
171 | zlog_debug( | |
172 | "Unable to connect to %s try again in 10 secs", | |
173 | svr.sun_path); | |
174 | close(mlag_socket); | |
175 | zrouter.mlag_info.timer_running = true; | |
907a2395 DS |
176 | event_add_timer(zmlag_master, zebra_mlag_connect, NULL, 10, |
177 | &zrouter.mlag_info.t_read); | |
cc9f21da | 178 | return; |
ee235396 | 179 | } |
ee235396 SK |
180 | |
181 | set_nonblocking(mlag_socket); | |
ee235396 SK |
182 | |
183 | if (IS_ZEBRA_DEBUG_MLAG) | |
184 | zlog_debug("%s: Connection with MLAG is established ", | |
185 | __func__); | |
186 | ||
907a2395 DS |
187 | event_add_read(zmlag_master, zebra_mlag_read, NULL, mlag_socket, |
188 | &zrouter.mlag_info.t_read); | |
ee235396 SK |
189 | /* |
190 | * Connection is established with MLAGD, post to clients | |
191 | */ | |
192 | zebra_mlag_handle_process_state(MLAG_UP); | |
ee235396 SK |
193 | } |
194 | ||
195 | /* | |
196 | * Currently we are doing polling later we will look for better options | |
197 | */ | |
d621815a | 198 | static int zebra_mlag_private_monitor_state(void) |
ee235396 | 199 | { |
907a2395 DS |
200 | event_add_event(zmlag_master, zebra_mlag_connect, NULL, 0, |
201 | &zrouter.mlag_info.t_read); | |
d621815a | 202 | return 0; |
ee235396 SK |
203 | } |
204 | ||
d621815a | 205 | static int zebra_mlag_private_open_channel(void) |
ee235396 SK |
206 | { |
207 | zmlag_master = zrouter.mlag_info.th_master; | |
208 | ||
209 | if (zrouter.mlag_info.connected == true) { | |
210 | if (IS_ZEBRA_DEBUG_MLAG) | |
211 | zlog_debug("%s: Zebra already connected to MLAGD", | |
212 | __func__); | |
213 | return 0; | |
214 | } | |
215 | ||
216 | if (zrouter.mlag_info.timer_running == true) { | |
217 | if (IS_ZEBRA_DEBUG_MLAG) | |
218 | zlog_debug( | |
219 | "%s: Connection retry is in progress for MLAGD", | |
220 | __func__); | |
221 | return 0; | |
222 | } | |
223 | ||
224 | if (zrouter.mlag_info.clients_interested_cnt) { | |
225 | /* | |
226 | * Connect only if any clients are showing interest | |
227 | */ | |
907a2395 DS |
228 | event_add_event(zmlag_master, zebra_mlag_connect, NULL, 0, |
229 | &zrouter.mlag_info.t_read); | |
ee235396 SK |
230 | } |
231 | return 0; | |
232 | } | |
233 | ||
d621815a | 234 | static int zebra_mlag_private_close_channel(void) |
ee235396 SK |
235 | { |
236 | if (zmlag_master == NULL) | |
237 | return -1; | |
238 | ||
239 | if (zrouter.mlag_info.clients_interested_cnt) { | |
240 | if (IS_ZEBRA_DEBUG_MLAG) | |
241 | zlog_debug("%s: still %d clients are connected, skip", | |
242 | __func__, | |
243 | zrouter.mlag_info.clients_interested_cnt); | |
244 | return -1; | |
245 | } | |
246 | ||
247 | /* | |
248 | * Post the De-register to MLAG, so that it can do necesasry cleanup | |
249 | */ | |
250 | zebra_mlag_send_deregister(); | |
251 | ||
252 | return 0; | |
253 | } | |
254 | ||
d621815a | 255 | static int zebra_mlag_private_cleanup_data(void) |
ee235396 SK |
256 | { |
257 | zmlag_master = NULL; | |
258 | zrouter.mlag_info.connected = false; | |
259 | zrouter.mlag_info.timer_running = false; | |
260 | ||
261 | close(mlag_socket); | |
ee235396 SK |
262 | return 0; |
263 | } | |
264 | ||
d621815a | 265 | static int zebra_mlag_module_init(void) |
ee235396 | 266 | { |
d621815a DL |
267 | hook_register(zebra_mlag_private_write_data, |
268 | zebra_mlag_private_write_data); | |
269 | hook_register(zebra_mlag_private_monitor_state, | |
270 | zebra_mlag_private_monitor_state); | |
271 | hook_register(zebra_mlag_private_open_channel, | |
272 | zebra_mlag_private_open_channel); | |
273 | hook_register(zebra_mlag_private_close_channel, | |
274 | zebra_mlag_private_close_channel); | |
275 | hook_register(zebra_mlag_private_cleanup_data, | |
276 | zebra_mlag_private_cleanup_data); | |
ee235396 SK |
277 | return 0; |
278 | } | |
279 | ||
d621815a DL |
280 | FRR_MODULE_SETUP( |
281 | .name = "zebra_cumulus_mlag", | |
282 | .version = FRR_VERSION, | |
283 | .description = "zebra Cumulus MLAG interface", | |
284 | .init = zebra_mlag_module_init, | |
80413c20 | 285 | ); |