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
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
|
/*
* Copyright (C) 2016 by Open Source Routing.
*
* This file is part of GNU Zebra.
*
* GNU Zebra is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* GNU Zebra is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Zebra; see the file COPYING. If not, write to the Free
* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*/
#include <zebra.h>
#include <netmpls/mpls.h>
#include "zebra/rt.h"
#include "zebra/zebra_mpls.h"
#include "zebra/debug.h"
#include "privs.h"
#include "prefix.h"
#include "interface.h"
#include "log.h"
extern struct zebra_privs_t zserv_privs;
struct {
u_int32_t rtseq;
int fd;
} kr_state;
static int
kernel_send_rtmsg_v4 (int action, mpls_label_t in_label, zebra_nhlfe_t *nhlfe)
{
struct iovec iov[5];
struct rt_msghdr hdr;
struct sockaddr_mpls sa_label_in, sa_label_out;
struct sockaddr_in nexthop;
int iovcnt = 0;
int ret;
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug ("%s: 0x%x, label=%u", __func__, action, in_label);
/* initialize header */
memset (&hdr, 0, sizeof (hdr));
hdr.rtm_version = RTM_VERSION;
hdr.rtm_type = action;
hdr.rtm_flags = RTF_UP;
hdr.rtm_fmask = RTF_MPLS;
hdr.rtm_seq = kr_state.rtseq++; /* overflow doesn't matter */
hdr.rtm_msglen = sizeof (hdr);
hdr.rtm_hdrlen = sizeof (struct rt_msghdr);
hdr.rtm_priority = 0;
/* adjust iovec */
iov[iovcnt].iov_base = &hdr;
iov[iovcnt++].iov_len = sizeof (hdr);
/* in label */
memset (&sa_label_in, 0, sizeof (sa_label_in));
sa_label_in.smpls_len = sizeof (sa_label_in);
sa_label_in.smpls_family = AF_MPLS;
sa_label_in.smpls_label = htonl(in_label << MPLS_LABEL_OFFSET);
/* adjust header */
hdr.rtm_flags |= RTF_MPLS | RTF_MPATH;
hdr.rtm_addrs |= RTA_DST;
hdr.rtm_msglen += sizeof (sa_label_in);
/* adjust iovec */
iov[iovcnt].iov_base = &sa_label_in;
iov[iovcnt++].iov_len = sizeof (sa_label_in);
/* nexthop */
memset (&nexthop, 0, sizeof (nexthop));
nexthop.sin_len = sizeof (nexthop);
nexthop.sin_family = AF_INET;
nexthop.sin_addr = nhlfe->nexthop->gate.ipv4;
/* adjust header */
hdr.rtm_flags |= RTF_GATEWAY;
hdr.rtm_addrs |= RTA_GATEWAY;
hdr.rtm_msglen += sizeof (nexthop);
/* adjust iovec */
iov[iovcnt].iov_base = &nexthop;
iov[iovcnt++].iov_len = sizeof (nexthop);
/* If action is RTM_DELETE we have to get rid of MPLS infos */
if (action != RTM_DELETE)
{
memset (&sa_label_out, 0, sizeof (sa_label_out));
sa_label_out.smpls_len = sizeof (sa_label_out);
sa_label_out.smpls_family = AF_MPLS;
sa_label_out.smpls_label =
htonl(nhlfe->nexthop->nh_label->label[0] << MPLS_LABEL_OFFSET);
/* adjust header */
hdr.rtm_addrs |= RTA_SRC;
hdr.rtm_flags |= RTF_MPLS;
hdr.rtm_msglen += sizeof (sa_label_out);
/* adjust iovec */
iov[iovcnt].iov_base = &sa_label_out;
iov[iovcnt++].iov_len = sizeof (sa_label_out);
if (nhlfe->nexthop->nh_label->label[0] == MPLS_LABEL_IMPLNULL)
hdr.rtm_mpls = MPLS_OP_POP;
else
hdr.rtm_mpls = MPLS_OP_SWAP;
}
if (zserv_privs.change(ZPRIVS_RAISE))
zlog_err ("Can't raise privileges");
ret = writev (kr_state.fd, iov, iovcnt);
if (zserv_privs.change(ZPRIVS_LOWER))
zlog_err ("Can't lower privileges");
if (ret == -1)
zlog_err ("%s: %s", __func__, safe_strerror (errno));
return ret;
}
#if !defined(ROUNDUP)
#define ROUNDUP(a) \
(((a) & (sizeof(long) - 1)) ? (1 + ((a) | (sizeof(long) - 1))) : (a))
#endif
static int
kernel_send_rtmsg_v6 (int action, mpls_label_t in_label, zebra_nhlfe_t *nhlfe)
{
struct iovec iov[5];
struct rt_msghdr hdr;
struct sockaddr_mpls sa_label_in, sa_label_out;
struct pad {
struct sockaddr_in6 addr;
char pad[sizeof(long)]; /* thank you IPv6 */
} nexthop;
int iovcnt = 0;
int ret;
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug ("%s: 0x%x, label=%u", __func__, action, in_label);
/* initialize header */
memset (&hdr, 0, sizeof (hdr));
hdr.rtm_version = RTM_VERSION;
hdr.rtm_type = action;
hdr.rtm_flags = RTF_UP;
hdr.rtm_fmask = RTF_MPLS;
hdr.rtm_seq = kr_state.rtseq++; /* overflow doesn't matter */
hdr.rtm_msglen = sizeof (hdr);
hdr.rtm_hdrlen = sizeof (struct rt_msghdr);
hdr.rtm_priority = 0;
/* adjust iovec */
iov[iovcnt].iov_base = &hdr;
iov[iovcnt++].iov_len = sizeof (hdr);
/* in label */
memset (&sa_label_in, 0, sizeof (sa_label_in));
sa_label_in.smpls_len = sizeof (sa_label_in);
sa_label_in.smpls_family = AF_MPLS;
sa_label_in.smpls_label = htonl(in_label << MPLS_LABEL_OFFSET);
/* adjust header */
hdr.rtm_flags |= RTF_MPLS | RTF_MPATH;
hdr.rtm_addrs |= RTA_DST;
hdr.rtm_msglen += sizeof (sa_label_in);
/* adjust iovec */
iov[iovcnt].iov_base = &sa_label_in;
iov[iovcnt++].iov_len = sizeof (sa_label_in);
/* nexthop */
memset (&nexthop, 0, sizeof (nexthop));
nexthop.addr.sin6_len = sizeof (struct sockaddr_in6);
nexthop.addr.sin6_family = AF_INET6;
nexthop.addr.sin6_addr = nhlfe->nexthop->gate.ipv6;
if (IN6_IS_ADDR_LINKLOCAL (&nexthop.addr.sin6_addr))
{
uint16_t tmp16;
struct sockaddr_in6 *sin6 = &nexthop.addr;
nexthop.addr.sin6_scope_id = nhlfe->nexthop->ifindex;
memcpy (&tmp16, &sin6->sin6_addr.s6_addr[2], sizeof (tmp16));
tmp16 = htons (sin6->sin6_scope_id);
memcpy (&sin6->sin6_addr.s6_addr[2], &tmp16, sizeof (tmp16));
sin6->sin6_scope_id = 0;
}
/* adjust header */
hdr.rtm_flags |= RTF_GATEWAY;
hdr.rtm_addrs |= RTA_GATEWAY;
hdr.rtm_msglen += ROUNDUP (sizeof (struct sockaddr_in6));
/* adjust iovec */
iov[iovcnt].iov_base = &nexthop;
iov[iovcnt++].iov_len = ROUNDUP (sizeof (struct sockaddr_in6));
/* If action is RTM_DELETE we have to get rid of MPLS infos */
if (action != RTM_DELETE)
{
memset (&sa_label_out, 0, sizeof (sa_label_out));
sa_label_out.smpls_len = sizeof (sa_label_out);
sa_label_out.smpls_family = AF_MPLS;
sa_label_out.smpls_label =
htonl(nhlfe->nexthop->nh_label->label[0] << MPLS_LABEL_OFFSET);
/* adjust header */
hdr.rtm_addrs |= RTA_SRC;
hdr.rtm_flags |= RTF_MPLS;
hdr.rtm_msglen += sizeof (sa_label_out);
/* adjust iovec */
iov[iovcnt].iov_base = &sa_label_out;
iov[iovcnt++].iov_len = sizeof (sa_label_out);
if (nhlfe->nexthop->nh_label->label[0] == MPLS_LABEL_IMPLNULL)
hdr.rtm_mpls = MPLS_OP_POP;
else
hdr.rtm_mpls = MPLS_OP_SWAP;
}
if (zserv_privs.change(ZPRIVS_RAISE))
zlog_err ("Can't raise privileges");
ret = writev (kr_state.fd, iov, iovcnt);
if (zserv_privs.change(ZPRIVS_LOWER))
zlog_err ("Can't lower privileges");
if (ret == -1)
zlog_err ("%s: %s", __func__, safe_strerror (errno));
return ret;
}
static int
kernel_lsp_cmd (int action, zebra_lsp_t *lsp)
{
zebra_nhlfe_t *nhlfe;
struct nexthop *nexthop = NULL;
int nexthop_num = 0;
for (nhlfe = lsp->nhlfe_list; nhlfe; nhlfe = nhlfe->next)
{
nexthop = nhlfe->nexthop;
if (!nexthop)
continue;
if (nexthop_num >= multipath_num)
break;
if (((action == RTM_ADD || action == RTM_CHANGE) &&
(CHECK_FLAG (nhlfe->flags, NHLFE_FLAG_SELECTED) &&
CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_ACTIVE))) ||
(action == RTM_DELETE &&
(CHECK_FLAG (nhlfe->flags, NHLFE_FLAG_INSTALLED) &&
CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB))))
{
nexthop_num++;
switch (NHLFE_FAMILY(nhlfe))
{
case AF_INET:
kernel_send_rtmsg_v4 (action, lsp->ile.in_label, nhlfe);
break;
case AF_INET6:
kernel_send_rtmsg_v6 (action, lsp->ile.in_label, nhlfe);
break;
default:
break;
}
if (action == RTM_ADD || action == RTM_CHANGE)
{
SET_FLAG (nhlfe->flags, NHLFE_FLAG_INSTALLED);
SET_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB);
}
else
{
UNSET_FLAG (nhlfe->flags, NHLFE_FLAG_INSTALLED);
UNSET_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB);
}
}
}
return (0);
}
int
kernel_add_lsp (zebra_lsp_t *lsp)
{
if (!lsp || !lsp->best_nhlfe) // unexpected
return -1;
return kernel_lsp_cmd (RTM_ADD, lsp);
}
int
kernel_upd_lsp (zebra_lsp_t *lsp)
{
if (!lsp || !lsp->best_nhlfe) // unexpected
return -1;
return kernel_lsp_cmd (RTM_CHANGE, lsp);
}
int
kernel_del_lsp (zebra_lsp_t *lsp)
{
if (!lsp) // unexpected
return -1;
return kernel_lsp_cmd (RTM_DELETE, lsp);
}
#define MAX_RTSOCK_BUF 128 * 1024
int
mpls_kernel_init (void)
{
int rcvbuf, default_rcvbuf;
socklen_t optlen;
if ((kr_state.fd = socket(AF_ROUTE, SOCK_RAW, 0)) == -1) {
zlog_warn("%s: socket", __func__);
return -1;
}
/* grow receive buffer, don't wanna miss messages */
optlen = sizeof (default_rcvbuf);
if (getsockopt(kr_state.fd, SOL_SOCKET, SO_RCVBUF,
&default_rcvbuf, &optlen) == -1)
zlog_warn("kr_init getsockopt SOL_SOCKET SO_RCVBUF");
else
for (rcvbuf = MAX_RTSOCK_BUF;
rcvbuf > default_rcvbuf &&
setsockopt(kr_state.fd, SOL_SOCKET, SO_RCVBUF,
&rcvbuf, sizeof (rcvbuf)) == -1 && errno == ENOBUFS;
rcvbuf /= 2)
; /* nothing */
kr_state.rtseq = 1;
return 0;
}
|
