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ad02a0eb SH |
1 | /* |
2 | * brmon.c RTnetlink listener. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | * | |
9 | * Authors: Stephen Hemminger <shemminger@osdl.org> | |
10 | * | |
11 | * Modified by Srinivas Aji <Aji_Srinivas@emc.com> for use | |
12 | * in RSTP daemon. - 2006-09-01 | |
13 | */ | |
14 | ||
15 | #include <stdio.h> | |
16 | #include <stdlib.h> | |
17 | #include <unistd.h> | |
18 | #include <syslog.h> | |
19 | #include <fcntl.h> | |
20 | #include <sys/socket.h> | |
21 | #include <sys/time.h> | |
22 | #include <net/if.h> | |
23 | #include <netinet/in.h> | |
24 | #include <linux/if_bridge.h> | |
25 | #include <string.h> | |
26 | ||
27 | #include "libnetlink.h" | |
28 | ||
29 | #include "bridge_ctl.h" | |
30 | ||
31 | static const char SNAPSHOT[] = "v0.1"; | |
32 | ||
ad02a0eb SH |
33 | /* RFC 2863 operational status */ |
34 | enum { | |
35 | IF_OPER_UNKNOWN, | |
36 | IF_OPER_NOTPRESENT, | |
37 | IF_OPER_DOWN, | |
38 | IF_OPER_LOWERLAYERDOWN, | |
39 | IF_OPER_TESTING, | |
40 | IF_OPER_DORMANT, | |
41 | IF_OPER_UP, | |
42 | }; | |
43 | ||
44 | /* link modes */ | |
45 | enum { | |
46 | IF_LINK_MODE_DEFAULT, | |
47 | IF_LINK_MODE_DORMANT, /* limit upward transition to dormant */ | |
48 | }; | |
49 | ||
50 | static const char *port_states[] = { | |
51 | [BR_STATE_DISABLED] = "disabled", | |
52 | [BR_STATE_LISTENING] = "listening", | |
53 | [BR_STATE_LEARNING] = "learning", | |
54 | [BR_STATE_FORWARDING] = "forwarding", | |
55 | [BR_STATE_BLOCKING] = "blocking", | |
56 | }; | |
57 | ||
ad02a0eb SH |
58 | static int dump_msg(const struct sockaddr_nl *who, struct nlmsghdr *n, |
59 | void *arg) | |
60 | { | |
61 | FILE *fp = arg; | |
62 | struct ifinfomsg *ifi = NLMSG_DATA(n); | |
11904a35 | 63 | struct rtattr *tb[IFLA_MAX + 1]; |
ad02a0eb SH |
64 | int len = n->nlmsg_len; |
65 | char b1[IFNAMSIZ]; | |
66 | int af_family = ifi->ifi_family; | |
67 | ||
11904a35 SH |
68 | if (n->nlmsg_type == NLMSG_DONE) |
69 | return 0; | |
70 | ||
ad02a0eb SH |
71 | len -= NLMSG_LENGTH(sizeof(*ifi)); |
72 | if (len < 0) { | |
11904a35 SH |
73 | return -1; |
74 | } | |
ad02a0eb SH |
75 | #if 0 |
76 | ||
77 | if (filter.ifindex && ifi->ifi_index != filter.ifindex) | |
78 | return 0; | |
79 | ||
11904a35 | 80 | if (filter.up && !(ifi->ifi_flags & IFF_UP)) |
ad02a0eb SH |
81 | return 0; |
82 | #endif | |
11904a35 SH |
83 | if (ifi->ifi_family != AF_BRIDGE && ifi->ifi_family != AF_UNSPEC) |
84 | return 0; | |
ad02a0eb | 85 | |
11904a35 SH |
86 | if (n->nlmsg_type != RTM_NEWLINK && n->nlmsg_type != RTM_DELLINK) |
87 | return 0; | |
ad02a0eb SH |
88 | |
89 | parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), len); | |
90 | ||
11904a35 SH |
91 | /* Check if we got this from bonding */ |
92 | if (tb[IFLA_MASTER] && af_family != AF_BRIDGE) | |
93 | return 0; | |
ad02a0eb | 94 | |
11904a35 SH |
95 | /* Check for BPDU */ |
96 | if (tb[IFLA_PRIORITY] && af_family == AF_BRIDGE) { | |
97 | bridge_bpdu_rcv(ifi->ifi_index, | |
98 | RTA_DATA(tb[IFLA_PRIORITY]), | |
99 | RTA_PAYLOAD(tb[IFLA_PRIORITY])); | |
100 | return 0; | |
101 | } | |
ad02a0eb SH |
102 | |
103 | if (tb[IFLA_IFNAME] == NULL) { | |
104 | fprintf(stderr, "BUG: nil ifname\n"); | |
105 | return -1; | |
106 | } | |
107 | ||
108 | if (n->nlmsg_type == RTM_DELLINK) | |
109 | fprintf(fp, "Deleted "); | |
110 | ||
111 | fprintf(fp, "%d: %s ", ifi->ifi_index, | |
11904a35 | 112 | tb[IFLA_IFNAME] ? (char *)RTA_DATA(tb[IFLA_IFNAME]) : "<nil>"); |
ad02a0eb SH |
113 | |
114 | if (tb[IFLA_OPERSTATE]) { | |
11904a35 | 115 | int state = *(int *)RTA_DATA(tb[IFLA_OPERSTATE]); |
ad02a0eb | 116 | switch (state) { |
11904a35 SH |
117 | case IF_OPER_UNKNOWN: |
118 | fprintf(fp, "Unknown "); | |
119 | break; | |
ad02a0eb | 120 | case IF_OPER_NOTPRESENT: |
11904a35 SH |
121 | fprintf(fp, "Not Present "); |
122 | break; | |
ad02a0eb | 123 | case IF_OPER_DOWN: |
11904a35 SH |
124 | fprintf(fp, "Down "); |
125 | break; | |
ad02a0eb | 126 | case IF_OPER_LOWERLAYERDOWN: |
11904a35 SH |
127 | fprintf(fp, "Lowerlayerdown "); |
128 | break; | |
ad02a0eb | 129 | case IF_OPER_TESTING: |
11904a35 SH |
130 | fprintf(fp, "Testing "); |
131 | break; | |
ad02a0eb | 132 | case IF_OPER_DORMANT: |
11904a35 SH |
133 | fprintf(fp, "Dormant "); |
134 | break; | |
ad02a0eb | 135 | case IF_OPER_UP: |
11904a35 SH |
136 | fprintf(fp, "Up "); |
137 | break; | |
ad02a0eb SH |
138 | default: |
139 | fprintf(fp, "State(%d) ", state); | |
140 | } | |
141 | } | |
11904a35 | 142 | |
ad02a0eb | 143 | if (tb[IFLA_MTU]) |
11904a35 | 144 | fprintf(fp, "mtu %u ", *(int *)RTA_DATA(tb[IFLA_MTU])); |
ad02a0eb SH |
145 | |
146 | if (tb[IFLA_MASTER]) { | |
11904a35 SH |
147 | fprintf(fp, "master %s ", |
148 | if_indextoname(*(int *)RTA_DATA(tb[IFLA_MASTER]), b1)); | |
ad02a0eb SH |
149 | } |
150 | ||
151 | if (tb[IFLA_PROTINFO]) { | |
11904a35 | 152 | uint8_t state = *(uint8_t *) RTA_DATA(tb[IFLA_PROTINFO]); |
ad02a0eb SH |
153 | if (state <= BR_STATE_BLOCKING) |
154 | fprintf(fp, "state %s", port_states[state]); | |
155 | else | |
156 | fprintf(fp, "state (%d)", state); | |
157 | } | |
158 | ||
ad02a0eb SH |
159 | fprintf(fp, "\n"); |
160 | fflush(fp); | |
11904a35 SH |
161 | { |
162 | int newlink = (n->nlmsg_type == RTM_NEWLINK); | |
163 | int up = 0; | |
164 | if (newlink && tb[IFLA_OPERSTATE]) { | |
165 | int state = *(int *)RTA_DATA(tb[IFLA_OPERSTATE]); | |
166 | up = (state == IF_OPER_UP) | |
167 | || (state == IF_OPER_UNKNOWN); | |
168 | } | |
169 | ||
170 | bridge_notify((tb[IFLA_MASTER] ? *(int *) | |
171 | RTA_DATA(tb[IFLA_MASTER]) : -1), ifi->ifi_index, | |
172 | newlink, up); | |
173 | } | |
ad02a0eb SH |
174 | return 0; |
175 | } | |
176 | ||
177 | #if 0 | |
178 | static void usage(void) | |
179 | { | |
180 | fprintf(stderr, "Usage: brmon\n"); | |
181 | exit(-1); | |
182 | } | |
183 | ||
184 | static int matches(const char *cmd, const char *pattern) | |
185 | { | |
186 | int len = strlen(cmd); | |
187 | if (len > strlen(pattern)) | |
188 | return -1; | |
189 | return memcmp(pattern, cmd, len); | |
190 | } | |
191 | ||
11904a35 | 192 | int main(int argc, char **argv) |
ad02a0eb SH |
193 | { |
194 | struct rtnl_handle rth; | |
195 | unsigned groups = ~RTMGRP_TC; | |
196 | int llink = 0; | |
197 | int laddr = 0; | |
198 | ||
199 | while (argc > 1) { | |
200 | if (matches(argv[1], "-Version") == 0) { | |
201 | printf("brmon %s\n", SNAPSHOT); | |
202 | exit(0); | |
203 | } else if (matches(argv[1], "link") == 0) { | |
11904a35 | 204 | llink = 1; |
ad02a0eb SH |
205 | groups = 0; |
206 | } else if (matches(argv[1], "bridge") == 0) { | |
11904a35 | 207 | laddr = 1; |
ad02a0eb SH |
208 | groups = 0; |
209 | } else if (strcmp(argv[1], "all") == 0) { | |
210 | groups = ~RTMGRP_TC; | |
211 | } else if (matches(argv[1], "help") == 0) { | |
212 | usage(); | |
213 | } else { | |
11904a35 SH |
214 | fprintf(stderr, |
215 | "Argument \"%s\" is unknown, try \"rtmon help\".\n", | |
216 | argv[1]); | |
ad02a0eb SH |
217 | exit(-1); |
218 | } | |
11904a35 SH |
219 | argc--; |
220 | argv++; | |
ad02a0eb SH |
221 | } |
222 | ||
223 | if (llink) | |
224 | groups |= RTMGRP_LINK; | |
225 | ||
226 | if (rtnl_open(&rth, groups) < 0) | |
227 | exit(1); | |
228 | ||
229 | if (rtnl_wilddump_request(&rth, PF_BRIDGE, RTM_GETLINK) < 0) { | |
230 | perror("Cannot send dump request"); | |
231 | exit(1); | |
232 | } | |
233 | ||
234 | if (rtnl_dump_filter(&rth, dump_msg, stdout, NULL, NULL) < 0) { | |
235 | fprintf(stderr, "Dump terminated\n"); | |
236 | return 1; | |
237 | } | |
238 | ||
239 | if (rtnl_listen(&rth, dump_msg, stdout) < 0) | |
240 | exit(2); | |
241 | ||
242 | exit(0); | |
243 | } | |
244 | #endif | |
245 | ||
246 | #include "bridge_ctl.h" | |
247 | #include "epoll_loop.h" | |
248 | ||
249 | struct rtnl_handle rth; | |
250 | struct epoll_event_handler br_handler; | |
251 | ||
252 | struct rtnl_handle rth_state; | |
253 | ||
254 | void br_ev_handler(uint32_t events, struct epoll_event_handler *h) | |
255 | { | |
11904a35 SH |
256 | if (rtnl_listen(&rth, dump_msg, stdout) < 0) { |
257 | fprintf(stderr, "Error on bridge monitoring socket\n"); | |
258 | exit(-1); | |
259 | } | |
ad02a0eb SH |
260 | } |
261 | ||
262 | int init_bridge_ops(void) | |
263 | { | |
11904a35 SH |
264 | if (rtnl_open(&rth, ~RTMGRP_TC) < 0) { |
265 | fprintf(stderr, "Couldn't open rtnl socket for monitoring\n"); | |
266 | return -1; | |
267 | } | |
268 | ||
269 | if (rtnl_open(&rth_state, 0) < 0) { | |
270 | fprintf(stderr, | |
271 | "Couldn't open rtnl socket for setting state\n"); | |
272 | return -1; | |
273 | } | |
274 | ||
275 | if (rtnl_wilddump_request(&rth, PF_BRIDGE, RTM_GETLINK) < 0) { | |
276 | fprintf(stderr, "Cannot send dump request: %m\n"); | |
277 | return -1; | |
278 | } | |
279 | ||
280 | if (rtnl_dump_filter(&rth, dump_msg, stdout, NULL, NULL) < 0) { | |
281 | fprintf(stderr, "Dump terminated\n"); | |
282 | return -1; | |
283 | } | |
284 | ||
285 | if (fcntl(rth.fd, F_SETFL, O_NONBLOCK) < 0) { | |
286 | fprintf(stderr, "Error setting O_NONBLOCK: %m\n"); | |
287 | return -1; | |
288 | } | |
289 | ||
290 | br_handler.fd = rth.fd; | |
291 | br_handler.arg = NULL; | |
292 | br_handler.handler = br_ev_handler; | |
293 | ||
294 | if (add_epoll(&br_handler) < 0) | |
295 | return -1; | |
296 | ||
297 | return 0; | |
ad02a0eb SH |
298 | } |
299 | ||
300 | /* Send message. Response is through bridge_notify */ | |
301 | void bridge_get_configuration(void) | |
302 | { | |
11904a35 SH |
303 | if (rtnl_wilddump_request(&rth, PF_BRIDGE, RTM_GETLINK) < 0) { |
304 | fprintf(stderr, "Cannot send dump request: %m\n"); | |
305 | } | |
ad02a0eb | 306 | } |