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
|
/* $OpenBSD: recvfromto.c,v 1.6 2015/12/17 08:01:55 tb Exp $ */
/* adapted from ipsec-tools 0.6 src/racoon/sockmisc.c */
/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
* All rights reserved.
*
* 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.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT 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 PROJECT 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.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <netinet/in.h>
#include <string.h>
#include "recvfromto.h"
/*
* Receive packet, with src/dst information. It is assumed that necessary
* setsockopt() have already performed on socket.
*/
int
recvfromto_nat_t(s, buf, buflen, flags, from, fromlen, to, tolen,
ipsec, ipseclen)
int s;
void *buf;
size_t buflen;
int flags;
struct sockaddr *from;
u_int *fromlen;
struct sockaddr *to;
u_int *tolen;
void *ipsec;
u_int *ipseclen;
{
int otolen;
u_int oipseclen = 0;
ssize_t len;
struct sockaddr_storage ss;
struct msghdr m;
struct cmsghdr *cm;
struct iovec iov[2];
u_char cmsgbuf[256];
struct in6_pktinfo *pi;
struct sockaddr_in *sin4;
socklen_t sslen;
struct sockaddr_in6 *sin6;
sslen = sizeof(ss);
if (getsockname(s, (struct sockaddr *)&ss, &sslen) < 0)
return -1;
m.msg_name = (caddr_t)from;
m.msg_namelen = *fromlen;
iov[0].iov_base = (caddr_t)buf;
iov[0].iov_len = buflen;
m.msg_iov = iov;
m.msg_iovlen = 1;
memset(cmsgbuf, 0, sizeof(cmsgbuf));
cm = (struct cmsghdr *)cmsgbuf;
m.msg_control = (caddr_t)cm;
m.msg_controllen = sizeof(cmsgbuf);
if ((len = recvmsg(s, &m, flags)) <= 0) {
return len;
}
*fromlen = m.msg_namelen;
if (ipsec && ipseclen) {
oipseclen = *ipseclen;
*ipseclen = 0;
}
otolen = *tolen;
*tolen = 0;
for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(&m);
m.msg_controllen != 0 && cm;
cm = (struct cmsghdr *)CMSG_NXTHDR(&m, cm)) {
if (ss.ss_family == AF_INET6
&& cm->cmsg_level == IPPROTO_IPV6
&& cm->cmsg_type == IPV6_PKTINFO
&& otolen >= sizeof(*sin6)) {
pi = (struct in6_pktinfo *)(CMSG_DATA(cm));
*tolen = sizeof(*sin6);
sin6 = (struct sockaddr_in6 *)to;
memset(sin6, 0, sizeof(*sin6));
sin6->sin6_family = AF_INET6;
#ifndef __linux__
sin6->sin6_len = sizeof(*sin6);
#endif
memcpy(&sin6->sin6_addr, &pi->ipi6_addr,
sizeof(sin6->sin6_addr));
/* XXX other cases, such as site-local? */
if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
sin6->sin6_scope_id = pi->ipi6_ifindex;
else
sin6->sin6_scope_id = 0;
sin6->sin6_port =
((struct sockaddr_in6 *)&ss)->sin6_port;
otolen = -1; /* "to" already set */
continue;
}
#ifdef IP_IPSECFLOWINFO
if (ss.ss_family == AF_INET /* ?? */
&& cm->cmsg_level == IPPROTO_IP
&& cm->cmsg_type == IP_IPSECFLOWINFO
&& oipseclen >= sizeof(u_int32_t)) {
*ipseclen = sizeof(u_int32_t);
memcpy(ipsec, CMSG_DATA(cm), *ipseclen);
continue;
}
#endif
#ifdef __linux__
if (ss.ss_family == AF_INET
&& cm->cmsg_level == IPPROTO_IP
&& cm->cmsg_type == IP_PKTINFO
&& otolen >= sizeof(sin4)) {
struct in_pktinfo *pi = (struct in_pktinfo *)(CMSG_DATA(cm));
*tolen = sizeof(*sin4);
sin4 = (struct sockaddr_in *)to;
memset(sin4, 0, sizeof(*sin4));
sin4->sin_family = AF_INET;
memcpy(&sin4->sin_addr, &pi->ipi_addr,
sizeof(sin4->sin_addr));
sin4->sin_port =
((struct sockaddr_in *)&ss)->sin_port;
otolen = -1; /* "to" already set */
continue;
}
#endif
#ifdef IPV6_RECVDSTADDR
if (ss.ss_family == AF_INET6
&& cm->cmsg_level == IPPROTO_IPV6
&& cm->cmsg_type == IPV6_RECVDSTADDR
&& otolen >= sizeof(*sin6)) {
*tolen = sizeof(*sin6);
sin6 = (struct sockaddr_in6 *)to;
memset(sin6, 0, sizeof(*sin6));
sin6->sin6_family = AF_INET6;
sin6->sin6_len = sizeof(*sin6);
memcpy(&sin6->sin6_addr, CMSG_DATA(cm),
sizeof(sin6->sin6_addr));
sin6->sin6_port =
((struct sockaddr_in6 *)&ss)->sin6_port;
otolen = -1; /* "to" already set */
continue;
}
#endif
#ifndef __linux__
if (ss.ss_family == AF_INET
&& cm->cmsg_level == IPPROTO_IP
&& cm->cmsg_type == IP_RECVDSTADDR
&& otolen >= sizeof(*sin4)) {
*tolen = sizeof(*sin4);
sin4 = (struct sockaddr_in *)to;
memset(sin4, 0, sizeof(*sin4));
sin4->sin_family = AF_INET;
sin4->sin_len = sizeof(*sin4);
memcpy(&sin4->sin_addr, CMSG_DATA(cm),
sizeof(sin4->sin_addr));
sin4->sin_port = ((struct sockaddr_in *)&ss)->sin_port;
otolen = -1; /* "to" already set */
continue;
}
#endif
}
return len;
}
int
recvfromto(s, buf, buflen, flags, from, fromlen, to, tolen)
int s;
void *buf;
size_t buflen;
int flags;
struct sockaddr *from;
u_int *fromlen;
struct sockaddr *to;
u_int *tolen;
{
return recvfromto_nat_t(s, buf, buflen, flags, from, fromlen,
to, tolen, NULL, NULL);
}
int
sendto_nat_t(s, buf, buflen, flags, to, tolen, ipsec)
int s;
const void *buf;
size_t buflen;
int flags;
struct sockaddr *to;
u_int tolen;
void *ipsec;
{
#ifdef IP_IPSECFLOWINFO
if (ipsec) {
struct iovec iov[1];
struct msghdr msg;
struct cmsghdr *cmsg;
union {
struct cmsghdr hdr;
char buf[CMSG_SPACE(sizeof(u_int32_t))];
} cmsgbuf;
iov[0].iov_base = (char *)buf;
iov[0].iov_len = buflen;
memset(&msg, 0, sizeof(msg));
memset(&cmsgbuf, 0, sizeof(cmsgbuf));
msg.msg_name = to;
msg.msg_namelen = tolen;
msg.msg_iov = iov;
msg.msg_iovlen = 1;
msg.msg_control = (caddr_t)&cmsgbuf.buf;
msg.msg_controllen = sizeof(cmsgbuf.buf);
cmsg = CMSG_FIRSTHDR(&msg);
cmsg->cmsg_len = CMSG_LEN(sizeof(u_int32_t));
cmsg->cmsg_level = IPPROTO_IP;
cmsg->cmsg_type = IP_IPSECFLOWINFO;
memcpy(CMSG_DATA(cmsg), ipsec, sizeof(u_int32_t));
return sendmsg(s, &msg, flags);
}
#endif
return sendto(s, buf, buflen, flags, to, tolen);
}
|
