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
|
/* $OpenBSD: ip_ipsp.h,v 1.19 1998/05/18 21:10:59 provos Exp $ */
/*
* The authors of this code are John Ioannidis (ji@tla.org),
* Angelos D. Keromytis (kermit@csd.uch.gr) and
* Niels Provos (provos@physnet.uni-hamburg.de).
*
* This code was written by John Ioannidis for BSD/OS in Athens, Greece,
* in November 1995.
*
* Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
* by Angelos D. Keromytis.
*
* Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
* and Niels Provos.
*
* Copyright (C) 1995, 1996, 1997, 1998 by John Ioannidis, Angelos D. Keromytis
* and Niels Provos.
*
* Permission to use, copy, and modify this software without fee
* is hereby granted, provided that this entire notice is included in
* all copies of any software which is or includes a copy or
* modification of this software.
* You may use this code under the GNU public license if you so wish. Please
* contribute changes back to the authors under this freer than GPL license
* so that we may further the use of strong encryption without limitations to
* all.
*
* THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
* REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
* MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
* PURPOSE.
*/
/*
* IPSP global definitions.
*/
struct expiration
{
u_int32_t exp_timeout;
struct in_addr exp_dst;
u_int32_t exp_spi;
u_int8_t exp_sproto;
struct expiration *exp_next;
struct expiration *exp_prev;
};
struct flow
{
struct flow *flow_next; /* Next in flow chain */
struct flow *flow_prev; /* Previous in flow chain */
struct tdb *flow_sa; /* Pointer to the SA */
struct in_addr flow_src; /* Source address */
struct in_addr flow_srcmask; /* Source netmask */
struct in_addr flow_dst; /* Destination address */
struct in_addr flow_dstmask; /* Destination netmask */
u_int16_t flow_sport; /* Source port, if applicable */
u_int16_t flow_dport; /* Destination port, if applicable */
u_int8_t flow_proto; /* Transport protocol, if applicable */
u_int8_t foo[3]; /* Alignment */
};
struct tdb /* tunnel descriptor block */
{
struct tdb *tdb_hnext; /* next in hash chain */
struct tdb *tdb_onext; /* next in output */
struct tdb *tdb_inext; /* next in input (prev!) */
struct xformsw *tdb_xform; /* transformation to use */
u_int32_t tdb_spi; /* SPI to use */
u_int32_t tdb_flags; /* Flags related to this TDB */
#define TDBF_UNIQUE 0x00001 /* This should not be used by others */
#define TDBF_TIMER 0x00002 /* Absolute expiration timer in use */
#define TDBF_BYTES 0x00004 /* Check the byte counters */
#define TDBF_PACKETS 0x00008 /* Check the packet counters */
#define TDBF_INVALID 0x00010 /* This SPI is not valid yet/anymore */
#define TDBF_FIRSTUSE 0x00020 /* Expire after first use */
#define TDBF_TUNNELING 0x00040 /* Do IP-in-IP encapsulation */
#define TDBF_SOFT_TIMER 0x00080 /* Soft expiration */
#define TDBF_SOFT_BYTES 0x00100 /* Soft expiration */
#define TDBF_SOFT_PACKETS 0x00200 /* Soft expiration */
#define TDBF_SOFT_FIRSTUSE 0x00400 /* Soft expiration */
#define TDBF_SAME_TTL 0x00800 /* Keep the packet TTL, in tunneling */
u_int64_t tdb_exp_packets; /* Expire after so many packets s|r */
u_int64_t tdb_soft_packets; /* Expiration warning */
u_int64_t tdb_cur_packets; /* Current number of packets s|r'ed */
u_int64_t tdb_exp_bytes; /* Expire after so many bytes passed */
u_int64_t tdb_soft_bytes; /* Expiration warning */
u_int64_t tdb_cur_bytes; /* Current count of bytes */
u_int64_t tdb_exp_timeout; /* When does the SPI expire */
u_int64_t tdb_soft_timeout; /* Send a soft-expire warning */
u_int64_t tdb_established; /* When was the SPI established */
u_int64_t tdb_first_use; /* When was it first used */
u_int64_t tdb_soft_first_use; /* Soft warning */
u_int64_t tdb_exp_first_use; /* Expire if tdb_first_use +
tdb_exp_first_use <= curtime */
struct in_addr tdb_dst; /* dest address for this SPI */
struct in_addr tdb_src; /* source address for this SPI,
* used when tunneling */
struct in_addr tdb_osrc;
struct in_addr tdb_odst; /* Source and destination addresses
* of outter IP header if we're doing
* tunneling */
caddr_t tdb_xdata; /* transformation data (opaque) */
struct flow *tdb_flow; /* Which flows use this SA */
u_int8_t tdb_ttl; /* TTL used in tunneling */
u_int8_t tdb_sproto; /* IPsec protocol */
u_int16_t tdb_satype; /* Alignment */
u_int32_t tdb_epoch; /* Used by the kernfs interface */
u_int8_t *tdb_confname; /* Used by the kernfs interface */
u_int8_t *tdb_authname; /* Used by the kernfs interface */
};
#define TDB_HASHMOD 257
struct xformsw
{
u_short xf_type; /* Unique ID of xform */
u_short xf_flags; /* flags (see below) */
char *xf_name; /* human-readable name */
int (*xf_attach)(void); /* called at config time */
int (*xf_init)(struct tdb *, struct xformsw *, struct mbuf *); /* xform initialization */
int (*xf_zeroize)(struct tdb *); /* termination */
struct mbuf *(*xf_input)(struct mbuf *, struct tdb *); /* called when packet received */
int (*xf_output)(struct mbuf *, struct sockaddr_encap *, struct tdb *, struct mbuf **); /* called when packet sent */
};
#define XF_IP4 1 /* IP inside IP */
#define XF_OLD_AH 2 /* RFCs 1828 & 1852 */
#define XF_OLD_ESP 3 /* RFCs 1829 & 1851 */
#define XF_NEW_AH 4 /* AH HMAC 96bits */
#define XF_NEW_ESP 5 /* ESP + auth 96bits + replay counter */
/* Supported key hash algorithms */
#define ALG_AUTH_MD5 1
#define ALG_AUTH_SHA1 2
#define ALG_AUTH_RMD160 3
/* Supported encryption algorithms */
#define ALG_ENC_DES 1
#define ALG_ENC_3DES 2
#define ALG_ENC_BLF 3
#define ALG_ENC_CAST 4
#define XFT_AUTH 0x0001
#define XFT_CONF 0x0100
#define IPSEC_ZEROES_SIZE 64
#define IPSEC_KERNFS_BUFSIZE 4096
#if BYTE_ORDER == LITTLE_ENDIAN
static __inline u_int64_t
htonq(u_int64_t q)
{
register u_int32_t u, l;
u = q >> 32;
l = (u_int32_t) q;
return htonl(u) | ((u_int64_t)htonl(l) << 32);
}
#define ntohq(_x) htonq(_x)
#elif BYTE_ORDER == BIG_ENDIAN
#define htonq(_x) (_x)
#define ntohq(_x) htonq(_x)
#else
#error "Please fix <machine/endian.h>"
#endif
extern unsigned char ipseczeroes[];
/*
* Names for IPsec sysctl objects
*/
#define IPSECCTL_ENCAP 0
#define IPSECCTL_MAXID 1
#define CTL_IPSEC_NAMES {\
{ "encap", CTLTYPE_NODE }, \
}
#ifdef _KERNEL
extern int encdebug;
struct tdb *tdbh[TDB_HASHMOD];
struct expiration *explist;
extern struct xformsw xformsw[], *xformswNXFORMSW;
u_int32_t notify_msgids;
/* Check if a given tdb has encryption, authentication and/or tunneling */
#define TDB_ATTRIB(x) (((x)->tdb_confname != NULL ? NOTIFY_SATYPE_CONF : 0)| \
((x)->tdb_authname != NULL ? NOTIFY_SATYPE_AUTH : 0)| \
((x)->tdb_confname != NULL && \
((x)->tdb_flags & TDBF_TUNNELING) ? NOTIFY_SATYPE_TUNNEL : 0))
/* Traverse spi chain and get attributes */
#define SPI_CHAIN_ATTRIB(have, TDB_DIR, TDBP) {\
struct tdb *tmptdb = (TDBP); \
(have) = 0; \
\
while (tmptdb && tmptdb->tdb_xform) { \
if (tmptdb == NULL || tmptdb->tdb_flags & TDBF_INVALID) \
break; \
(have) |= TDB_ATTRIB(tmptdb); \
tmptdb = tmptdb->TDB_DIR; \
} \
}
/* TDB management routines */
extern u_int32_t reserve_spi(u_int32_t, struct in_addr, u_int8_t, int *);
extern struct tdb *gettdb(u_int32_t, struct in_addr, u_int8_t);
extern void puttdb(struct tdb *);
extern int tdb_delete(struct tdb *, int);
/* Expiration management routines */
extern struct expiration *get_expiration(void);
extern void put_expiration(struct expiration *);
extern void handle_expirations(void *);
extern void cleanup_expirations(struct in_addr, u_int32_t, u_int8_t);
/* Flow management routines */
extern struct flow *get_flow(void);
extern void put_flow(struct flow *, struct tdb *);
extern void delete_flow(struct flow *, struct tdb *);
extern struct flow *find_flow(struct in_addr, struct in_addr, struct in_addr,
struct in_addr, u_int8_t, u_int16_t, u_int16_t,
struct tdb *);
extern struct flow *find_global_flow(struct in_addr, struct in_addr,
struct in_addr, struct in_addr, u_int8_t,
u_int16_t, u_int16_t);
/* XF_IP4 */
extern int ipe4_attach(void);
extern int ipe4_init(struct tdb *, struct xformsw *, struct mbuf *);
extern int ipe4_zeroize(struct tdb *);
extern int ipe4_output(struct mbuf *, struct sockaddr_encap *, struct tdb *,
struct mbuf **);
extern void ipe4_input __P((struct mbuf *, ...));
extern void ip4_input __P((struct mbuf *, ...));
/* XF_OLD_AH */
extern int ah_old_attach(void);
extern int ah_old_init(struct tdb *, struct xformsw *, struct mbuf *);
extern int ah_old_zeroize(struct tdb *);
extern int ah_old_output(struct mbuf *, struct sockaddr_encap *, struct tdb *,
struct mbuf **);
extern struct mbuf *ah_old_input(struct mbuf *, struct tdb *);
/* XF_NEW_AH */
extern int ah_new_attach(void);
extern int ah_new_init(struct tdb *, struct xformsw *, struct mbuf *);
extern int ah_new_zeroize(struct tdb *);
extern int ah_new_output(struct mbuf *, struct sockaddr_encap *, struct tdb *,
struct mbuf **);
extern struct mbuf *ah_new_input(struct mbuf *, struct tdb *);
/* XF_OLD_ESP */
extern int esp_old_attach(void);
extern int esp_old_init(struct tdb *, struct xformsw *, struct mbuf *);
extern int esp_old_zeroize(struct tdb *);
extern int esp_old_output(struct mbuf *, struct sockaddr_encap *, struct tdb *,
struct mbuf **);
extern struct mbuf *esp_old_input(struct mbuf *, struct tdb *);
/* XF_NEW_ESP */
extern int esp_new_attach(void);
extern int esp_new_init(struct tdb *, struct xformsw *, struct mbuf *);
extern int esp_new_zeroize(struct tdb *);
extern int esp_new_output(struct mbuf *, struct sockaddr_encap *, struct tdb *,
struct mbuf **);
extern struct mbuf *esp_new_input(struct mbuf *, struct tdb *);
/* Padding */
extern caddr_t m_pad(struct mbuf *, int);
/* Replay window */
extern int checkreplaywindow32(u_int32_t, u_int32_t, u_int32_t *, u_int32_t,
u_int32_t *);
#endif
|
