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1e6d2d09 VD |
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 | * Modified by Srinivas Aji <Aji_Srinivas@emc.com> | |
11 | * for use in RSTP daemon. - 2006-09-01 | |
12 | * Modified by Vitalii Demianets <vitas@nppfactor.kiev.ua> | |
13 | * for use in MSTP daemon. - 2011-07-18 | |
14 | */ | |
15 | ||
16 | #include <stdio.h> | |
17 | #include <stdlib.h> | |
18 | #include <fcntl.h> | |
19 | #include <netinet/in.h> | |
20 | #include <linux/if_bridge.h> | |
21 | ||
22 | #include "libnetlink.h" | |
23 | #include "bridge_ctl.h" | |
24 | #include "netif_utils.h" | |
25 | #include "epoll_loop.h" | |
26 | ||
27 | /* RFC 2863 operational status */ | |
28 | enum | |
29 | { | |
30 | IF_OPER_UNKNOWN, | |
31 | IF_OPER_NOTPRESENT, | |
32 | IF_OPER_DOWN, | |
33 | IF_OPER_LOWERLAYERDOWN, | |
34 | IF_OPER_TESTING, | |
35 | IF_OPER_DORMANT, | |
36 | IF_OPER_UP, | |
37 | }; | |
38 | ||
39 | /* link modes */ | |
40 | enum | |
41 | { | |
42 | IF_LINK_MODE_DEFAULT, | |
43 | IF_LINK_MODE_DORMANT, /* limit upward transition to dormant */ | |
44 | }; | |
45 | ||
46 | static const char *port_states[] = | |
47 | { | |
48 | [BR_STATE_DISABLED] = "disabled", | |
49 | [BR_STATE_LISTENING] = "listening", | |
50 | [BR_STATE_LEARNING] = "learning", | |
51 | [BR_STATE_FORWARDING] = "forwarding", | |
52 | [BR_STATE_BLOCKING] = "blocking", | |
53 | }; | |
54 | ||
55 | static struct rtnl_handle rth; | |
56 | static struct epoll_event_handler br_handler; | |
57 | ||
58 | struct rtnl_handle rth_state; | |
59 | ||
60 | static int dump_msg(const struct sockaddr_nl *who, struct nlmsghdr *n, | |
61 | void *arg) | |
62 | { | |
63 | FILE *fp = arg; | |
64 | struct ifinfomsg *ifi = NLMSG_DATA(n); | |
65 | struct rtattr * tb[IFLA_MAX + 1]; | |
66 | int len = n->nlmsg_len; | |
67 | char b1[IFNAMSIZ]; | |
68 | int af_family = ifi->ifi_family; | |
69 | bool newlink, up; | |
70 | int br_index; | |
71 | ||
72 | if(n->nlmsg_type == NLMSG_DONE) | |
73 | return 0; | |
74 | ||
75 | len -= NLMSG_LENGTH(sizeof(*ifi)); | |
76 | if(len < 0) | |
77 | { | |
78 | return -1; | |
79 | } | |
80 | ||
81 | if(af_family != AF_BRIDGE && af_family != AF_UNSPEC) | |
82 | return 0; | |
83 | ||
84 | if(n->nlmsg_type != RTM_NEWLINK && n->nlmsg_type != RTM_DELLINK) | |
85 | return 0; | |
86 | ||
87 | parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), len); | |
88 | ||
89 | /* Check if we got this from bonding */ | |
90 | if(tb[IFLA_MASTER] && af_family != AF_BRIDGE) | |
91 | return 0; | |
92 | ||
93 | if(tb[IFLA_IFNAME] == NULL) | |
94 | { | |
95 | fprintf(stderr, "BUG: nil ifname\n"); | |
96 | return -1; | |
97 | } | |
98 | ||
99 | if(n->nlmsg_type == RTM_DELLINK) | |
100 | fprintf(fp, "Deleted "); | |
101 | ||
102 | fprintf(fp, "%d: %s ", ifi->ifi_index, (char*)RTA_DATA(tb[IFLA_IFNAME])); | |
103 | ||
104 | if(tb[IFLA_OPERSTATE]) | |
105 | { | |
106 | int state = *(int*)RTA_DATA(tb[IFLA_OPERSTATE]); | |
107 | switch (state) | |
108 | { | |
109 | case IF_OPER_UNKNOWN: | |
110 | fprintf(fp, "Unknown "); | |
111 | break; | |
112 | case IF_OPER_NOTPRESENT: | |
113 | fprintf(fp, "Not Present "); | |
114 | break; | |
115 | case IF_OPER_DOWN: | |
116 | fprintf(fp, "Down "); | |
117 | break; | |
118 | case IF_OPER_LOWERLAYERDOWN: | |
119 | fprintf(fp, "Lowerlayerdown "); | |
120 | break; | |
121 | case IF_OPER_TESTING: | |
122 | fprintf(fp, "Testing "); | |
123 | break; | |
124 | case IF_OPER_DORMANT: | |
125 | fprintf(fp, "Dormant "); | |
126 | break; | |
127 | case IF_OPER_UP: | |
128 | fprintf(fp, "Up "); | |
129 | break; | |
130 | default: | |
131 | fprintf(fp, "State(%d) ", state); | |
132 | } | |
133 | } | |
134 | ||
135 | if(tb[IFLA_MTU]) | |
136 | fprintf(fp, "mtu %u ", *(int*)RTA_DATA(tb[IFLA_MTU])); | |
137 | ||
138 | if(tb[IFLA_MASTER]) | |
139 | { | |
140 | fprintf(fp, "master %s ", | |
141 | if_indextoname(*(int*)RTA_DATA(tb[IFLA_MASTER]), b1)); | |
142 | } | |
143 | ||
144 | if(tb[IFLA_PROTINFO]) | |
145 | { | |
146 | uint8_t state = *(uint8_t *)RTA_DATA(tb[IFLA_PROTINFO]); | |
147 | if(state <= BR_STATE_BLOCKING) | |
148 | fprintf(fp, "state %s", port_states[state]); | |
149 | else | |
150 | fprintf(fp, "state (%d)", state); | |
151 | } | |
152 | ||
153 | fprintf(fp, "\n"); | |
154 | fflush(fp); | |
155 | ||
156 | newlink = (n->nlmsg_type == RTM_NEWLINK); | |
157 | up = false; | |
158 | if(newlink && tb[IFLA_OPERSTATE]) | |
159 | { | |
160 | int state = *(uint8_t*)RTA_DATA(tb[IFLA_OPERSTATE]); | |
161 | up = (state == IF_OPER_UP) || (state == IF_OPER_UNKNOWN); | |
162 | } | |
163 | ||
164 | if(tb[IFLA_MASTER]) | |
165 | br_index = *(int*)RTA_DATA(tb[IFLA_MASTER]); | |
166 | else if(is_bridge((char*)RTA_DATA(tb[IFLA_IFNAME]))) | |
167 | br_index = ifi->ifi_index; | |
168 | else | |
169 | br_index = -1; | |
170 | ||
171 | bridge_notify(br_index, ifi->ifi_index, newlink, up); | |
172 | ||
173 | return 0; | |
174 | } | |
175 | ||
176 | static inline void br_ev_handler(uint32_t events, struct epoll_event_handler *h) | |
177 | { | |
178 | if(rtnl_listen(&rth, dump_msg, stdout) < 0) | |
179 | { | |
180 | fprintf(stderr, "Error on bridge monitoring socket\n"); | |
181 | exit(-1); | |
182 | } | |
183 | } | |
184 | ||
185 | int init_bridge_ops(void) | |
186 | { | |
187 | if(rtnl_open(&rth, ~RTMGRP_TC) < 0) | |
188 | { | |
189 | fprintf(stderr, "Couldn't open rtnl socket for monitoring\n"); | |
190 | return -1; | |
191 | } | |
192 | ||
193 | if(rtnl_open(&rth_state, 0) < 0) | |
194 | { | |
195 | fprintf(stderr, "Couldn't open rtnl socket for setting state\n"); | |
196 | return -1; | |
197 | } | |
198 | ||
199 | if(rtnl_wilddump_request(&rth, PF_BRIDGE, RTM_GETLINK) < 0) | |
200 | { | |
201 | fprintf(stderr, "Cannot send dump request: %m\n"); | |
202 | return -1; | |
203 | } | |
204 | ||
205 | if(rtnl_dump_filter(&rth, dump_msg, stdout, NULL, NULL) < 0) | |
206 | { | |
207 | fprintf(stderr, "Dump terminated\n"); | |
208 | return -1; | |
209 | } | |
210 | ||
211 | if(fcntl(rth.fd, F_SETFL, O_NONBLOCK) < 0) | |
212 | { | |
213 | fprintf(stderr, "Error setting O_NONBLOCK: %m\n"); | |
214 | return -1; | |
215 | } | |
216 | ||
217 | br_handler.fd = rth.fd; | |
218 | br_handler.arg = NULL; | |
219 | br_handler.handler = br_ev_handler; | |
220 | ||
221 | if(add_epoll(&br_handler) < 0) | |
222 | return -1; | |
223 | ||
224 | return 0; | |
225 | } |