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
|
#include <machine/rtems-bsd-kernel-space.h>
/*-
* SPDX-License-Identifier: BSD-2-Clause-NetBSD
*
* Copyright (c) 1998 The NetBSD Foundation, Inc.
* Copyright (c) 2014, 2018 Andrey V. Elsukov <ae@FreeBSD.org>
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Heiko W.Rupp <hwr@pilhuhn.de>
*
* IPv6-over-GRE contributed by Gert Doering <gert@greenie.muc.de>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* $NetBSD: ip_gre.c,v 1.29 2003/09/05 23:02:43 itojun Exp $
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <rtems/bsd/local/opt_inet.h>
#include <rtems/bsd/local/opt_inet6.h>
#include <sys/param.h>
#include <sys/jail.h>
#include <sys/systm.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/mbuf.h>
#include <sys/errno.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#include <sys/malloc.h>
#include <sys/proc.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/vnet.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>
#include <netinet/ip_encap.h>
#include <netinet/ip_var.h>
#ifdef INET6
#include <netinet/ip6.h>
#endif
#include <net/if_gre.h>
#define GRE_TTL 30
VNET_DEFINE(int, ip_gre_ttl) = GRE_TTL;
#define V_ip_gre_ttl VNET(ip_gre_ttl)
SYSCTL_INT(_net_inet_ip, OID_AUTO, grettl, CTLFLAG_VNET | CTLFLAG_RW,
&VNET_NAME(ip_gre_ttl), 0, "Default TTL value for encapsulated packets");
VNET_DEFINE_STATIC(struct gre_list *, ipv4_hashtbl) = NULL;
#define V_ipv4_hashtbl VNET(ipv4_hashtbl)
#define GRE_HASH(src, dst) (V_ipv4_hashtbl[\
in_gre_hashval((src), (dst)) & (GRE_HASH_SIZE - 1)])
#define GRE_HASH_SC(sc) GRE_HASH((sc)->gre_oip.ip_src.s_addr,\
(sc)->gre_oip.ip_dst.s_addr)
static uint32_t
in_gre_hashval(in_addr_t src, in_addr_t dst)
{
uint32_t ret;
ret = fnv_32_buf(&src, sizeof(src), FNV1_32_INIT);
return (fnv_32_buf(&dst, sizeof(dst), ret));
}
static int
in_gre_checkdup(const struct gre_softc *sc, in_addr_t src, in_addr_t dst)
{
struct gre_softc *tmp;
if (sc->gre_family == AF_INET &&
sc->gre_oip.ip_src.s_addr == src &&
sc->gre_oip.ip_dst.s_addr == dst)
return (EEXIST);
CK_LIST_FOREACH(tmp, &GRE_HASH(src, dst), chain) {
if (tmp == sc)
continue;
if (tmp->gre_oip.ip_src.s_addr == src &&
tmp->gre_oip.ip_dst.s_addr == dst)
return (EADDRNOTAVAIL);
}
return (0);
}
static int
in_gre_lookup(const struct mbuf *m, int off, int proto, void **arg)
{
const struct ip *ip;
struct gre_softc *sc;
if (V_ipv4_hashtbl == NULL)
return (0);
MPASS(in_epoch(net_epoch_preempt));
ip = mtod(m, const struct ip *);
CK_LIST_FOREACH(sc, &GRE_HASH(ip->ip_dst.s_addr,
ip->ip_src.s_addr), chain) {
/*
* This is an inbound packet, its ip_dst is source address
* in softc.
*/
if (sc->gre_oip.ip_src.s_addr == ip->ip_dst.s_addr &&
sc->gre_oip.ip_dst.s_addr == ip->ip_src.s_addr) {
if ((GRE2IFP(sc)->if_flags & IFF_UP) == 0)
return (0);
*arg = sc;
return (ENCAP_DRV_LOOKUP);
}
}
return (0);
}
static void
in_gre_attach(struct gre_softc *sc)
{
sc->gre_hlen = sizeof(struct greip);
sc->gre_oip.ip_v = IPVERSION;
sc->gre_oip.ip_hl = sizeof(struct ip) >> 2;
sc->gre_oip.ip_p = IPPROTO_GRE;
gre_updatehdr(sc, &sc->gre_gihdr->gi_gre);
CK_LIST_INSERT_HEAD(&GRE_HASH_SC(sc), sc, chain);
}
void
in_gre_setopts(struct gre_softc *sc, u_long cmd, uint32_t value)
{
MPASS(cmd == GRESKEY || cmd == GRESOPTS);
/* NOTE: we are protected with gre_ioctl_sx lock */
MPASS(sc->gre_family == AF_INET);
CK_LIST_REMOVE(sc, chain);
GRE_WAIT();
if (cmd == GRESKEY)
sc->gre_key = value;
else
sc->gre_options = value;
in_gre_attach(sc);
}
int
in_gre_ioctl(struct gre_softc *sc, u_long cmd, caddr_t data)
{
struct ifreq *ifr = (struct ifreq *)data;
struct sockaddr_in *dst, *src;
struct ip *ip;
int error;
/* NOTE: we are protected with gre_ioctl_sx lock */
error = EINVAL;
switch (cmd) {
case SIOCSIFPHYADDR:
src = &((struct in_aliasreq *)data)->ifra_addr;
dst = &((struct in_aliasreq *)data)->ifra_dstaddr;
/* sanity checks */
if (src->sin_family != dst->sin_family ||
src->sin_family != AF_INET ||
src->sin_len != dst->sin_len ||
src->sin_len != sizeof(*src))
break;
if (src->sin_addr.s_addr == INADDR_ANY ||
dst->sin_addr.s_addr == INADDR_ANY) {
error = EADDRNOTAVAIL;
break;
}
if (V_ipv4_hashtbl == NULL)
V_ipv4_hashtbl = gre_hashinit();
error = in_gre_checkdup(sc, src->sin_addr.s_addr,
dst->sin_addr.s_addr);
if (error == EADDRNOTAVAIL)
break;
if (error == EEXIST) {
/* Addresses are the same. Just return. */
error = 0;
break;
}
ip = malloc(sizeof(struct greip) + 3 * sizeof(uint32_t),
M_GRE, M_WAITOK | M_ZERO);
ip->ip_src.s_addr = src->sin_addr.s_addr;
ip->ip_dst.s_addr = dst->sin_addr.s_addr;
if (sc->gre_family != 0) {
/* Detach existing tunnel first */
CK_LIST_REMOVE(sc, chain);
GRE_WAIT();
free(sc->gre_hdr, M_GRE);
/* XXX: should we notify about link state change? */
}
sc->gre_family = AF_INET;
sc->gre_hdr = ip;
sc->gre_oseq = 0;
sc->gre_iseq = UINT32_MAX;
in_gre_attach(sc);
break;
case SIOCGIFPSRCADDR:
case SIOCGIFPDSTADDR:
if (sc->gre_family != AF_INET) {
error = EADDRNOTAVAIL;
break;
}
src = (struct sockaddr_in *)&ifr->ifr_addr;
memset(src, 0, sizeof(*src));
src->sin_family = AF_INET;
src->sin_len = sizeof(*src);
src->sin_addr = (cmd == SIOCGIFPSRCADDR) ?
sc->gre_oip.ip_src: sc->gre_oip.ip_dst;
error = prison_if(curthread->td_ucred, (struct sockaddr *)src);
if (error != 0)
memset(src, 0, sizeof(*src));
break;
}
return (error);
}
int
in_gre_output(struct mbuf *m, int af, int hlen)
{
struct greip *gi;
gi = mtod(m, struct greip *);
switch (af) {
case AF_INET:
/*
* gre_transmit() has used M_PREPEND() that doesn't guarantee
* m_data is contiguous more than hlen bytes. Use m_copydata()
* here to avoid m_pullup().
*/
m_copydata(m, hlen + offsetof(struct ip, ip_tos),
sizeof(u_char), &gi->gi_ip.ip_tos);
m_copydata(m, hlen + offsetof(struct ip, ip_id),
sizeof(u_short), (caddr_t)&gi->gi_ip.ip_id);
break;
#ifdef INET6
case AF_INET6:
gi->gi_ip.ip_tos = 0; /* XXX */
ip_fillid(&gi->gi_ip);
break;
#endif
}
gi->gi_ip.ip_ttl = V_ip_gre_ttl;
gi->gi_ip.ip_len = htons(m->m_pkthdr.len);
return (ip_output(m, NULL, NULL, IP_FORWARDING, NULL, NULL));
}
static const struct encaptab *ecookie = NULL;
static const struct encap_config ipv4_encap_cfg = {
.proto = IPPROTO_GRE,
.min_length = sizeof(struct greip) + sizeof(struct ip),
.exact_match = ENCAP_DRV_LOOKUP,
.lookup = in_gre_lookup,
.input = gre_input
};
void
in_gre_init(void)
{
if (!IS_DEFAULT_VNET(curvnet))
return;
ecookie = ip_encap_attach(&ipv4_encap_cfg, NULL, M_WAITOK);
}
void
in_gre_uninit(void)
{
if (IS_DEFAULT_VNET(curvnet))
ip_encap_detach(ecookie);
if (V_ipv4_hashtbl != NULL)
gre_hashdestroy(V_ipv4_hashtbl);
}
|
