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
|
// SPDX-License-Identifier: MIT
/*
Copyright 2007, 2008 by Grégoire Henry, Julien Cristau and Juliusz Chroboczek
Copyright 2011, 2012 by Matthieu Boutier and Juliusz Chroboczek
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <sys/time.h>
#include <sys/param.h>
#include <time.h>
#include <fcntl.h>
#include "babeld.h"
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <zebra.h>
#include "prefix.h"
#include "zclient.h"
#include "kernel.h"
#include "privs.h"
#include "command.h"
#include "vty.h"
#include "memory.h"
#include "frrevent.h"
#include "nexthop.h"
#include "util.h"
#include "babel_interface.h"
#include "babel_zebra.h"
static int
zebra_route(int add, int familt, const unsigned char *pref, unsigned short plen,
const unsigned char *gate, int ifindex, unsigned int metric);
int
kernel_interface_operational(struct interface *interface)
{
return if_is_operative(interface);
}
int
kernel_interface_mtu(struct interface *interface)
{
return MIN(interface->mtu, interface->mtu6);
}
int
kernel_interface_wireless(struct interface *interface)
{
return 0;
}
int
kernel_route(enum babel_kernel_routes operation, const unsigned char *pref,
unsigned short plen, const unsigned char *gate, int ifindex,
unsigned int metric, const unsigned char *newgate, int newifindex,
unsigned int newmetric)
{
int rc;
int family;
/* Check that the protocol family is consistent. */
if(plen >= 96 && v4mapped(pref)) {
if(!v4mapped(gate)) {
errno = EINVAL;
return -1;
}
family = AF_INET;
} else {
if(v4mapped(gate)) {
errno = EINVAL;
return -1;
}
family = AF_INET6;
}
switch (operation) {
case ROUTE_ADD:
return zebra_route(1, family, pref, plen, gate, ifindex, metric);
case ROUTE_FLUSH:
return zebra_route(0, family, pref, plen, gate, ifindex, metric);
case ROUTE_MODIFY:
if(newmetric == metric && memcmp(newgate, gate, 16) == 0 &&
newifindex == ifindex)
return 0;
debugf(BABEL_DEBUG_ROUTE, "Modify route: delete old; add new.");
rc = zebra_route(0, family, pref, plen, gate, ifindex, metric);
if (rc < 0)
return -1;
rc = zebra_route(1, family, pref, plen, newgate, newifindex,
newmetric);
return rc;
}
return 0;
}
static int
zebra_route(int add, int family, const unsigned char *pref, unsigned short plen,
const unsigned char *gate, int ifindex, unsigned int metric)
{
struct zapi_route api; /* quagga's communication system */
struct prefix quagga_prefix; /* quagga's prefix */
union g_addr babel_prefix_addr; /* babeld's prefix addr */
struct zapi_nexthop *api_nh; /* next router to go - no ECMP */
api_nh = &api.nexthops[0];
/* convert to be understandable by quagga */
/* convert given addresses */
switch (family) {
case AF_INET:
uchar_to_inaddr(&babel_prefix_addr.ipv4, pref);
break;
case AF_INET6:
uchar_to_in6addr(&babel_prefix_addr.ipv6, pref);
break;
}
/* make prefix structure */
memset (&quagga_prefix, 0, sizeof(quagga_prefix));
quagga_prefix.family = family;
switch (family) {
case AF_INET:
IPV4_ADDR_COPY (&quagga_prefix.u.prefix4, &babel_prefix_addr.ipv4);
/* our plen is for v4mapped's addr */
quagga_prefix.prefixlen = plen - 96;
break;
case AF_INET6:
IPV6_ADDR_COPY (&quagga_prefix.u.prefix6, &babel_prefix_addr.ipv6);
quagga_prefix.prefixlen = plen;
break;
}
apply_mask(&quagga_prefix);
memset(&api, 0, sizeof(api));
api.type = ZEBRA_ROUTE_BABEL;
api.safi = SAFI_UNICAST;
api.vrf_id = VRF_DEFAULT;
api.prefix = quagga_prefix;
if(metric >= KERNEL_INFINITY) {
zapi_route_set_blackhole(&api, BLACKHOLE_REJECT);
} else {
SET_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP);
api.nexthop_num = 1;
api_nh->ifindex = ifindex;
api_nh->vrf_id = VRF_DEFAULT;
switch (family) {
case AF_INET:
uchar_to_inaddr(&api_nh->gate.ipv4, gate);
if (IPV4_ADDR_SAME(&api_nh->gate.ipv4, &quagga_prefix.u.prefix4)
&& quagga_prefix.prefixlen == IPV4_MAX_BITLEN) {
api_nh->type = NEXTHOP_TYPE_IFINDEX;
} else {
api_nh->type = NEXTHOP_TYPE_IPV4_IFINDEX;
}
break;
case AF_INET6:
uchar_to_in6addr(&api_nh->gate.ipv6, gate);
/* difference to IPv4: always leave the linklocal as nexthop */
api_nh->type = NEXTHOP_TYPE_IPV6_IFINDEX;
break;
}
SET_FLAG(api.message, ZAPI_MESSAGE_METRIC);
api.metric = metric;
}
debugf(BABEL_DEBUG_ROUTE, "%s route (%s) to zebra",
add ? "adding" : "removing",
(family == AF_INET) ? "ipv4" : "ipv6");
return zclient_route_send (add ? ZEBRA_ROUTE_ADD : ZEBRA_ROUTE_DELETE,
zclient, &api);
}
int
if_eui64(int ifindex, unsigned char *eui)
{
struct interface *ifp = if_lookup_by_index(ifindex, VRF_DEFAULT);
if (ifp == NULL) {
return -1;
}
uint8_t len = (uint8_t)ifp->hw_addr_len;
char *tmp = (void*) ifp->hw_addr;
if (len == 8) {
memcpy(eui, tmp, 8);
eui[0] ^= 2;
} else if (len == 6) {
memcpy(eui, tmp, 3);
eui[3] = 0xFF;
eui[4] = 0xFE;
memcpy(eui+5, tmp+3, 3);
} else {
return -1;
}
return 0;
}
/* Like gettimeofday, but returns monotonic time. If POSIX clocks are not
available, falls back to gettimeofday but enforces monotonicity. */
void
gettime(struct timeval *tv)
{
monotime(tv);
}
/* If /dev/urandom doesn't exist, this will fail with ENOENT, which the
caller will deal with gracefully. */
int
read_random_bytes(void *buf, size_t len)
{
int fd;
int rc;
fd = open("/dev/urandom", O_RDONLY);
if(fd < 0) {
rc = -1;
} else {
rc = read(fd, buf, len);
if(rc < 0 || (unsigned) rc < len)
rc = -1;
close(fd);
}
return rc;
}
|
