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
|
/*
* BIRD -- Unix Routing Table Syncing
*
* (c) 1998 Martin Mares <mj@ucw.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/ioctl.h>
#include <net/route.h>
#define LOCAL_DEBUG
#include "nest/bird.h"
#include "nest/iface.h"
#include "nest/route.h"
#include "nest/protocol.h"
#include "lib/unix.h"
#include "lib/krt.h"
int
krt_capable(net *net, rte *e)
{
rta *a = e->attrs;
return
a->cast == RTC_UNICAST &&
(a->dest == RTD_ROUTER
#ifndef CONFIG_AUTO_ROUTES
|| a->dest == RTD_DEVICE
#endif
#ifdef RTF_REJECT
|| a->dest == RTD_UNREACHABLE
#endif
) &&
!a->tos;
}
void
krt_remove_route(net *net, rte *old)
{
struct rtentry re;
if (old && !krt_capable(net, old))
{
DBG("krt_remove_route(ignored %I/%d)\n", net->n.prefix, net->n.pxlen);
return;
}
DBG("krt_remove_route(%I/%d)\n", net->n.prefix, net->n.pxlen);
bzero(&re, sizeof(re));
fill_in_sockaddr((struct sockaddr_in *) &re.rt_dst, net->n.prefix, 0);
fill_in_sockaddr((struct sockaddr_in *) &re.rt_genmask, ipa_mkmask(net->n.pxlen), 0);
if (ioctl(if_scan_sock, SIOCDELRT, &re) < 0)
log(L_ERR "SIOCDELRT(%I/%d): %m", net->n.prefix, net->n.pxlen);
}
void
krt_add_route(net *net, rte *new)
{
struct rtentry re;
rta *a = new->attrs;
if (!krt_capable(net, new))
{
DBG("krt_add_route(ignored %I/%d)\n", net->n.prefix, net->n.pxlen);
return;
}
DBG("krt_add_route(%I/%d)\n", net->n.prefix, net->n.pxlen);
bzero(&re, sizeof(re));
fill_in_sockaddr((struct sockaddr_in *) &re.rt_dst, net->n.prefix, 0);
fill_in_sockaddr((struct sockaddr_in *) &re.rt_genmask, ipa_mkmask(net->n.pxlen), 0);
re.rt_flags = RTF_UP;
if (net->n.pxlen == 32)
re.rt_flags |= RTF_HOST;
switch (a->dest)
{
case RTD_ROUTER:
fill_in_sockaddr((struct sockaddr_in *) &re.rt_gateway, a->gw, 0);
re.rt_flags |= RTF_GATEWAY;
break;
#ifndef CONFIG_AUTO_ROUTES
case RTD_DEVICE:
re.rt_dev = a->iface->name;
break;
#endif
#ifdef RTF_REJECT
case RTD_UNREACHABLE:
re.rt_flags |= RTF_REJECT;
break;
#endif
default:
die("krt set: unknown flags, but not filtered");
}
if (ioctl(if_scan_sock, SIOCADDRT, &re) < 0)
log(L_ERR "SIOCADDRT(%I/%d): %m", net->n.prefix, net->n.pxlen);
}
void
krt_set_notify(struct proto *x, net *net, rte *new, rte *old)
{
if (x->state != PRS_UP)
return;
if (old)
krt_remove_route(net, old);
if (new)
krt_add_route(net, new);
}
void
krt_set_preconfig(struct krt_proto *x)
{
if (if_scan_sock < 0)
die("krt set: missing socket");
x->p.rt_notify = krt_set_notify;
}
|
