1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
|
/* $OpenBSD: kmroute.c,v 1.2 2010/05/26 13:56:07 nicm Exp $ */
/*
* Copyright (c) 2005, 2006 Esben Norby <norby@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netinet/ip_mroute.h>
#include <err.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include "igmp.h"
#include "dvmrpd.h"
#include "dvmrp.h"
#include "dvmrpe.h"
#include "log.h"
extern struct dvmrpd_conf *conf;
char *mroute_ptr; /* packet buffer */
void main_imsg_compose_rde(int, pid_t, void *, u_int16_t);
int
kmr_init(int fd)
{
struct iface *iface;
struct route_report rr;
LIST_FOREACH(iface, &conf->iface_list, entry) {
log_debug("kmr_init: interface %s", iface->name);
rr.net.s_addr = iface->addr.s_addr & iface->mask.s_addr;
rr.mask = iface->mask;
rr.nexthop.s_addr = 0;
rr.metric = iface->metric;
rr.ifindex = iface->ifindex;
main_imsg_compose_rde(IMSG_ROUTE_REPORT, -1, &rr, sizeof(rr));
mrt_add_vif(conf->mroute_socket, iface);
}
if ((mroute_ptr = calloc(1, IBUF_READ_SIZE)) == NULL)
fatal("kmr_init");
return (0);
}
void
kmr_shutdown(void)
{
struct iface *iface;
kmr_mfc_decouple();
kmroute_clear();
LIST_FOREACH(iface, &conf->iface_list, entry) {
log_debug("kmr_shutdown: interface %s", iface->name);
mrt_del_vif(conf->mroute_socket, iface);
}
free(mroute_ptr);
}
void
kmr_recv_msg(int fd, short event, void *bula)
{
struct mfc mfc;
struct igmpmsg kernel_msg;
char *buf;
ssize_t r;
if (event != EV_READ)
return;
/* setup buffer */
buf = mroute_ptr;
if ((r = recvfrom(fd, buf, IBUF_READ_SIZE, 0, NULL, NULL)) == -1) {
if (errno != EAGAIN && errno != EINTR)
log_debug("kmr_recv_msg: error receiving packet");
return;
}
memcpy(&kernel_msg, buf, sizeof(kernel_msg));
/* we are only interested in kernel messages */
if (kernel_msg.im_mbz != 0)
return;
switch (kernel_msg.im_msgtype) {
case IGMPMSG_NOCACHE:
/* verify that dst is a multicast group */
if (!IN_MULTICAST(ntohl(kernel_msg.im_dst.s_addr))) {
log_debug("kmr_recv_msg: kernel providing garbage!");
return;
}
/* send MFC entry to RDE */
mfc.origin = kernel_msg.im_src;
mfc.group = kernel_msg.im_dst;
mfc.ifindex = kernel_msg.im_vif;
main_imsg_compose_rde(IMSG_MFC_ADD, 0, &mfc, sizeof(mfc));
break;
case IGMPMSG_WRONGVIF:
case IGMPMSG_WHOLEPKT:
case IGMPMSG_BW_UPCALL:
default:
log_debug("kmr_recv_msg: unhandled msg type %d!",
kernel_msg.im_msgtype);
}
}
void
kmr_mfc_couple(void)
{
log_info("kernel multicast forwarding cache coupled");
}
void
kmr_mfc_decouple(void)
{
log_info("kernel multicast forwarding cache decoupled");
}
void
kmroute_clear(void)
{
}
int
mrt_init(int fd)
{
int flag = 1;
if (setsockopt(fd, IPPROTO_IP, MRT_INIT, &flag,
sizeof(flag)) < 0) {
log_warn("mrt_init: error setting MRT_INIT");
return (-1);
}
return (0);
}
int
mrt_done(int fd)
{
int flag = 0;
if (setsockopt(fd, IPPROTO_IP, MRT_DONE, &flag,
sizeof(flag)) < 0) {
log_warn("mrt_done: error setting MRT_DONE");
return (-1);
}
return (0);
}
int
mrt_add_vif(int fd, struct iface *iface)
{
struct vifctl vc;
vc.vifc_vifi = iface->ifindex;
vc.vifc_flags = 0;
vc.vifc_threshold = 1;
vc.vifc_rate_limit = 0;
vc.vifc_lcl_addr.s_addr = iface->addr.s_addr;
vc.vifc_rmt_addr.s_addr = 0;
if (setsockopt(fd, IPPROTO_IP, MRT_ADD_VIF, &vc,
sizeof(vc)) < 0) {
log_warn("mrt_add_vif: error adding VIF");
return (-1);
}
return (0);
}
void
mrt_del_vif(int fd, struct iface *iface)
{
vifi_t vifi;
vifi = iface->ifindex;
if (setsockopt(fd, IPPROTO_IP, MRT_DEL_VIF, &vifi,
sizeof(vifi)) < 0)
log_warn("mrt_del_vif: error deleting VIF");
}
int
mrt_add_mfc(int fd, struct mfc *mfc)
{
struct mfcctl mc;
int i;
log_debug("mrt_add_mfc: interface %d, group %s", mfc->ifindex,
inet_ntoa(mfc->group));
mc.mfcc_origin = mfc->origin;
mc.mfcc_mcastgrp = mfc->group;
mc.mfcc_parent = mfc->ifindex;
for (i = 0; i < MAXVIFS; i++) {
mc.mfcc_ttls[i] = mfc->ttls[i];
}
if (setsockopt(fd, IPPROTO_IP, MRT_ADD_MFC, &mc, sizeof(mc))
< 0) {
log_warnx("mrt_add_mfc: error adding group %s to interface %d",
inet_ntoa(mfc->group), mfc->ifindex);
return (-1);
}
return (0);
}
int
mrt_del_mfc(int fd, struct mfc *mfc)
{
struct mfcctl mc;
log_debug("mrt_del_mfc: group %s", inet_ntoa(mfc->group));
mc.mfcc_origin = mfc->origin;
mc.mfcc_mcastgrp = mfc->group;
if (setsockopt(fd, IPPROTO_IP, MRT_DEL_MFC, &mc, sizeof(mc))
< 0) {
log_warnx("mrt_del_mfc: error deleting group %s ",
inet_ntoa(mfc->group));
return (-1);
}
return (0);
}
|
