ip_ipsp.h revision 1.90 
1/*	$OpenBSD: ip_ipsp.h,v 1.90 2001/05/27 03:48:15 angelos Exp $	*/
2
3/*
4 * The authors of this code are John Ioannidis (ji@tla.org),
5 * Angelos D. Keromytis (kermit@csd.uch.gr),
6 * Niels Provos (provos@physnet.uni-hamburg.de) and
7 * Niklas Hallqvist (niklas@appli.se).
8 *
9 * The original version of this code was written by John Ioannidis
10 * for BSD/OS in Athens, Greece, in November 1995.
11 *
12 * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
13 * by Angelos D. Keromytis.
14 *
15 * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
16 * and Niels Provos.
17 *
18 * Additional features in 1999 by Angelos D. Keromytis and Niklas Hallqvist.
19 *
20 * Copyright (c) 1995, 1996, 1997, 1998, 1999 by John Ioannidis,
21 * Angelos D. Keromytis and Niels Provos.
22 * Copyright (c) 1999 Niklas Hallqvist.
23 *
24 * Permission to use, copy, and modify this software without fee
25 * is hereby granted, provided that this entire notice is included in
26 * all copies of any software which is or includes a copy or
27 * modification of this software.
28 * You may use this code under the GNU public license if you so wish. Please
29 * contribute changes back to the authors under this freer than GPL license
30 * so that we may further the use of strong encryption without limitations to
31 * all.
32 *
33 * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
34 * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
35 * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
36 * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
37 * PURPOSE.
38 */
39
40#ifndef _NETINET_IPSP_H_
41#define _NETINET_IPSP_H_
42
43/* IPSP global definitions. */
44
45#include <sys/types.h>
46#include <sys/queue.h>
47#include <sys/timeout.h>
48#include <netinet/in.h>
49
50union sockaddr_union
51{
52    struct sockaddr     sa;
53    struct sockaddr_in  sin;
54    struct sockaddr_in6 sin6;
55};
56
57/* HMAC key sizes */
58#define MD5HMAC96_KEYSIZE       16
59#define SHA1HMAC96_KEYSIZE      20
60#define RIPEMD160HMAC96_KEYSIZE 20
61
62#define AH_HMAC_HASHLEN		12	/* 96 bits of authenticator */
63#define AH_HMAC_RPLENGTH        4	/* 32 bits of replay counter */
64#define AH_HMAC_INITIAL_RPL	1	/* Replay counter initial value */
65
66/* Authenticator lengths */
67#define AH_MD5_ALEN		16
68#define AH_SHA1_ALEN		20
69#define AH_RMD160_ALEN		20
70#define AH_ALEN_MAX		20 	/* Keep updated */
71
72/* Reserved SPI numbers */
73#define SPI_LOCAL_USE		0
74#define SPI_RESERVED_MIN	1
75#define SPI_RESERVED_MAX	255
76
77/* sysctl default values */
78#define IPSEC_DEFAULT_EMBRYONIC_SA_TIMEOUT	60	/* 1 minute */
79#define IPSEC_DEFAULT_PFS                       1
80#define IPSEC_DEFAULT_SOFT_ALLOCATIONS          0
81#define IPSEC_DEFAULT_EXP_ALLOCATIONS           0
82#define IPSEC_DEFAULT_SOFT_BYTES                0
83#define IPSEC_DEFAULT_EXP_BYTES                 0
84#define IPSEC_DEFAULT_SOFT_TIMEOUT              80000
85#define IPSEC_DEFAULT_EXP_TIMEOUT               86400
86#define IPSEC_DEFAULT_SOFT_FIRST_USE            3600
87#define IPSEC_DEFAULT_EXP_FIRST_USE             7200
88#define IPSEC_DEFAULT_DEF_ENC                   "aes"
89#define IPSEC_DEFAULT_DEF_AUTH                   "hmac-sha1"
90#define IPSEC_DEFAULT_EXPIRE_ACQUIRE            30
91
92struct sockaddr_encap
93{
94    u_int8_t	sen_len;		/* length */
95    u_int8_t	sen_family;		/* PF_KEY */
96    u_int16_t	sen_type;		/* see SENT_* */
97    union
98    {
99	struct				/* SENT_IP4 */
100	{
101	    u_int8_t Direction;
102	    struct in_addr Src;
103	    struct in_addr Dst;
104	    u_int8_t Proto;
105	    u_int16_t Sport;
106	    u_int16_t Dport;
107	} Sip4;
108
109	struct				/* SENT_IP6 */
110	{
111	    u_int8_t Direction;
112	    struct in6_addr Src;
113	    struct in6_addr Dst;
114	    u_int8_t Proto;
115	    u_int16_t Sport;
116	    u_int16_t Dport;
117	} Sip6;
118
119	struct ipsec_policy *PolicyHead;  /* SENT_IPSP */
120    } Sen;
121};
122
123#define IPSP_DIRECTION_IN     0x1
124#define IPSP_DIRECTION_OUT    0x2
125
126#define sen_data	  Sen.Data
127#define sen_ip_src	  Sen.Sip4.Src
128#define sen_ip_dst	  Sen.Sip4.Dst
129#define sen_proto	  Sen.Sip4.Proto
130#define sen_sport	  Sen.Sip4.Sport
131#define sen_dport	  Sen.Sip4.Dport
132#define sen_direction     Sen.Sip4.Direction
133#define sen_ip6_src	  Sen.Sip6.Src
134#define sen_ip6_dst	  Sen.Sip6.Dst
135#define sen_ip6_proto	  Sen.Sip6.Proto
136#define sen_ip6_sport	  Sen.Sip6.Sport
137#define sen_ip6_dport	  Sen.Sip6.Dport
138#define sen_ip6_direction Sen.Sip6.Direction
139#define sen_ipsp          Sen.PolicyHead
140
141/*
142 * The "type" is really part of the address as far as the routing
143 * system is concerned. By using only one bit in the type field
144 * for each type, we sort-of make sure that different types of
145 * encapsulation addresses won't be matched against the wrong type.
146 *
147 */
148
149#define SENT_IP4	0x0001		/* data is two struct in_addr */
150#define SENT_IPSP	0x0002		/* data as in IP4/6 plus SPI */
151#define SENT_IP6        0x0004
152
153#define SENT_LEN        sizeof(struct sockaddr_encap)
154
155struct ipsec_ref
156{
157    u_int16_t ref_type;		/* Subtype of data */
158    int16_t   ref_len;		/* Length of data following */
159    int       ref_count;	/* Reference count */
160    int       ref_malloctype;	/* malloc(9) type, for freeing purposes */
161};
162
163struct ipsec_acquire
164{
165    union sockaddr_union       ipa_addr;
166    u_int64_t                  ipa_expire;
167    u_int32_t                  ipa_seq;
168    struct sockaddr_encap      ipa_info;
169    struct sockaddr_encap      ipa_mask;
170    struct mbuf               *ipa_packet;
171    TAILQ_ENTRY(ipsec_acquire) ipa_next;
172};
173
174struct ipsec_policy
175{
176    struct sockaddr_encap ipo_addr;
177    struct sockaddr_encap ipo_mask;
178
179    union sockaddr_union ipo_src;   /* Local address to use */
180    union sockaddr_union ipo_dst;   /* Remote gateway -- if it's zeroed:
181				     * - on output, we try to contact the
182				     * remote host directly (if needed).
183				     * - on input, we accept on if the
184				     * inner source is the same as the
185				     * outer source address, or if transport
186				     * mode was used.
187				     */
188
189    u_int64_t            ipo_last_searched; /* Timestamp of last lookup */
190
191    u_int8_t             ipo_flags; /* See IPSP_POLICY_* definitions */
192    u_int8_t             ipo_type;  /* USE/ACQUIRE/... */
193    u_int8_t             ipo_sproto;/* ESP, AH; if zero we use system dflts */
194
195    struct tdb          *ipo_tdb;   /* Cached entry */
196
197    struct ipsec_ref    *ipo_srcid;
198    struct ipsec_ref    *ipo_dstid;
199    struct ipsec_ref    *ipo_local_cred;
200
201    TAILQ_ENTRY(ipsec_policy) ipo_tdb_next; /* List of policies on TDB */
202    TAILQ_ENTRY(ipsec_policy) ipo_list; /* List of all policy entries */
203};
204
205#define IPSP_POLICY_NONE    0x0000  /* No flags set */
206#define IPSP_POLICY_SOCKET  0x0001  /* Socket-attached policy */
207
208#define IPSP_IPSEC_USE      0 /* Use if existing, don't bother establishing */
209#define IPSP_IPSEC_ACQUIRE  1 /* Try to acquire in parallel but let packet */
210#define IPSP_IPSEC_REQUIRE  2 /* Require SA */
211#define IPSP_PERMIT         3 /* Permit traffic through */
212#define IPSP_DENY           4 /* Deny traffic */
213#define IPSP_IPSEC_DONTACQ  5 /* Require, but don't acquire */
214
215/* Notification types */
216#define NOTIFY_SOFT_EXPIRE      0       /* Soft expiration of SA */
217#define NOTIFY_HARD_EXPIRE      1       /* Hard expiration of SA */
218#define NOTIFY_REQUEST_SA       2       /* Establish an SA */
219
220#define NOTIFY_SATYPE_CONF      1       /* SA should do encryption */
221#define NOTIFY_SATYPE_AUTH      2       /* SA should do authentication */
222#define NOTIFY_SATYPE_TUNNEL    4       /* SA should use tunneling */
223
224/*
225 * For encapsulation routes are possible not only for the destination
226 * address but also for the protocol, source and destination ports
227 * if available
228 */
229
230struct route_enc {
231    struct rtentry *re_rt;
232    struct sockaddr_encap re_dst;
233};
234
235struct tdb				/* tunnel descriptor block */
236{
237    /*
238     * Each TDB is on three hash tables: one keyed on dst/spi/sproto,
239     * one keyed on dst/sproto, and one keyed on src/sproto. The first
240     * is used for finding a specific TDB, the second for finding TDBs
241     * TDBs for outgoing policy matching, and the third for incoming
242     * policy matching. The following three fields maintain the hash
243     * queues in those three tables.
244     */
245    struct tdb	     *tdb_hnext;   /* dst/spi/sproto table */
246    struct tdb       *tdb_anext;   /* dst/sproto table */
247    struct tdb       *tdb_snext;   /* src/sproto table */
248    struct tdb       *tdb_inext;
249    struct tdb       *tdb_onext;
250
251    struct xformsw   *tdb_xform;	/* Transformation to use */
252    struct enc_xform *tdb_encalgxform;  /* Encryption algorithm xform */
253    struct auth_hash *tdb_authalgxform; /* Authentication algorithm xform */
254
255#define TDBF_UNIQUE	      0x00001	/* This should not be used by others */
256#define TDBF_TIMER            0x00002	/* Absolute expiration timer in use */
257#define TDBF_BYTES            0x00004	/* Check the byte counters */
258#define TDBF_ALLOCATIONS      0x00008	/* Check the flows counters */
259#define TDBF_INVALID          0x00010	/* This SPI is not valid yet/anymore */
260#define TDBF_FIRSTUSE         0x00020	/* Expire after first use */
261#define TDBF_HALFIV           0x00040   /* Use half-length IV (ESP old only) */
262#define TDBF_SOFT_TIMER       0x00080	/* Soft expiration */
263#define TDBF_SOFT_BYTES       0x00100	/* Soft expiration */
264#define TDBF_SOFT_ALLOCATIONS 0x00200	/* Soft expiration */
265#define TDBF_SOFT_FIRSTUSE    0x00400	/* Soft expiration */
266#define TDBF_PFS              0x00800	/* Ask for PFS from Key Mgmt. */
267#define TDBF_TUNNELING        0x01000	/* Force IP-IP encapsulation */
268#define TDBF_NOREPLAY         0x02000   /* No replay counter present */
269#define TDBF_RANDOMPADDING    0x04000   /* Random data in the ESP padding */
270#define TDBF_SKIPCRYPTO       0x08000   /* Skip actual crypto processing */
271
272    u_int32_t	      tdb_flags;  	/* Flags related to this TDB */
273
274    struct timeout    tdb_timer_tmo;
275    struct timeout    tdb_first_tmo;
276    struct timeout    tdb_stimer_tmo;
277    struct timeout    tdb_sfirst_tmo;
278
279    u_int32_t         tdb_exp_allocations;  /* Expire after so many flows */
280    u_int32_t         tdb_soft_allocations; /* Expiration warning */
281    u_int32_t         tdb_cur_allocations;  /* Total number of allocations */
282
283    u_int64_t         tdb_exp_bytes;    /* Expire after so many bytes passed */
284    u_int64_t         tdb_soft_bytes;	/* Expiration warning */
285    u_int64_t         tdb_cur_bytes;	/* Current count of bytes */
286
287    u_int64_t         tdb_exp_timeout;	/* When does the SPI expire */
288    u_int64_t         tdb_soft_timeout;	/* Send a soft-expire warning */
289    u_int64_t         tdb_established;	/* When was the SPI established */
290
291    u_int64_t	      tdb_first_use;	  /* When was it first used */
292    u_int64_t         tdb_soft_first_use; /* Soft warning */
293    u_int64_t         tdb_exp_first_use;  /* Expire if tdb_first_use +
294					   * tdb_exp_first_use <= curtime */
295    u_int64_t         tdb_cryptoid;     /* Crypto session ID */
296
297    u_int32_t	      tdb_spi;    	/* SPI */
298    u_int16_t         tdb_amxkeylen;    /* Raw authentication key length */
299    u_int16_t         tdb_emxkeylen;    /* Raw encryption key length */
300    u_int16_t         tdb_ivlen;        /* IV length */
301    u_int8_t	      tdb_sproto;	/* IPsec protocol */
302    u_int8_t          tdb_wnd;          /* Replay window */
303    u_int8_t          tdb_satype;       /* SA type (RFC2367, PF_KEY) */
304
305    union sockaddr_union tdb_dst;	/* Destination address for this SA */
306    union sockaddr_union tdb_src;	/* Source address for this SA */
307    union sockaddr_union tdb_proxy;
308
309    u_int8_t         *tdb_amxkey;       /* Raw authentication key */
310    u_int8_t         *tdb_emxkey;       /* Raw encryption key */
311
312    u_int32_t         tdb_rpl;	        /* Replay counter */
313    u_int32_t         tdb_bitmap;       /* Used for replay sliding window */
314    u_int32_t         tdb_initial;	/* Initial replay value */
315
316    u_int32_t         tdb_epoch;	/* Used by the kernfs interface */
317
318    u_int8_t          tdb_iv[4];        /* Used for HALF-IV ESP */
319
320    struct ipsec_ref *tdb_local_cred;
321    struct ipsec_ref *tdb_remote_cred;
322    struct ipsec_ref *tdb_srcid;        /* Source ID for this SA */
323    struct ipsec_ref *tdb_dstid;        /* Destination ID for this SA */
324
325    TAILQ_HEAD(tdb_inp_head_in, inpcb) tdb_inp_in;
326    TAILQ_HEAD(tdb_inp_head_out, inpcb) tdb_inp_out;
327    TAILQ_HEAD(tdb_policy_head, ipsec_policy) tdb_policy_head;
328};
329
330struct tdb_ident
331{
332    u_int32_t spi;
333    union sockaddr_union dst;
334    u_int8_t proto;
335};
336
337struct tdb_crypto {
338    u_int32_t			tc_spi;
339    union sockaddr_union	tc_dst;
340    u_int8_t			tc_proto;
341    u_int32_t			tc_spi2;
342    union sockaddr_union	tc_dst2;
343    u_int8_t			tc_proto2;
344    int                         tc_protoff;
345    int                         tc_skip;
346    caddr_t                     tc_ptr;
347};
348
349struct ipsecinit
350{
351    u_int8_t       *ii_enckey;
352    u_int8_t       *ii_authkey;
353    u_int16_t       ii_enckeylen;
354    u_int16_t       ii_authkeylen;
355    u_int8_t        ii_encalg;
356    u_int8_t        ii_authalg;
357};
358
359struct xformsw
360{
361    u_short		xf_type;	/* Unique ID of xform */
362    u_short		xf_flags;	/* flags (see below) */
363    char		*xf_name;	/* human-readable name */
364    int		(*xf_attach)(void);	/* called at config time */
365    int		(*xf_init)(struct tdb *, struct xformsw *, struct ipsecinit *);
366    int		(*xf_zeroize)(struct tdb *); /* termination */
367    int         (*xf_input)(struct mbuf *, struct tdb *, int, int); /* input */
368    int		(*xf_output)(struct mbuf *, struct tdb *, struct mbuf **, int, int, struct tdb *);        /* output */
369};
370
371/* xform IDs */
372#define XF_IP4		1	/* IP inside IP */
373#define XF_AH		2	/* AH */
374#define XF_ESP		3	/* ESP */
375#define XF_TCPSIGNATURE	5	/* TCP MD5 Signature option, RFC 2358 */
376
377/* xform attributes */
378#define XFT_AUTH	0x0001
379#define XFT_CONF	0x0100
380
381#define IPSEC_ZEROES_SIZE	256	/* Larger than an IP6 extension hdr. */
382#define IPSEC_KERNFS_BUFSIZE    4096
383
384#if BYTE_ORDER == LITTLE_ENDIAN
385static __inline u_int64_t
386htonq(u_int64_t q)
387{
388    register u_int32_t u, l;
389    u = q >> 32;
390    l = (u_int32_t) q;
391
392    return htonl(u) | ((u_int64_t)htonl(l) << 32);
393}
394
395#define ntohq(_x) htonq(_x)
396
397#elif BYTE_ORDER == BIG_ENDIAN
398
399#define htonq(_x) (_x)
400#define ntohq(_x) htonq(_x)
401
402#else
403#error  "Please fix <machine/endian.h>"
404#endif
405
406#ifdef _KERNEL
407
408/*
409 * Protects all tdb lists.
410 * Must at least be splsoftnet (note: do not use splsoftclock as it is
411 * special on some architectures, assuming it is always an spl lowering
412 * operation).
413 */
414#define spltdb	splsoftnet
415
416extern int encdebug;
417extern int ipsec_acl;
418extern int ipsec_keep_invalid;
419extern int ipsec_in_use;
420extern u_int64_t ipsec_last_added;
421extern int ipsec_require_pfs;
422extern int ipsec_expire_acquire;
423
424extern int ipsec_soft_allocations;
425extern int ipsec_exp_allocations;
426extern int ipsec_soft_bytes;
427extern int ipsec_exp_bytes;
428extern int ipsec_soft_timeout;
429extern int ipsec_exp_timeout;
430extern int ipsec_soft_first_use;
431extern int ipsec_exp_first_use;
432extern char ipsec_def_enc[];
433extern char ipsec_def_auth[];
434
435extern struct enc_xform enc_xform_des;
436extern struct enc_xform enc_xform_3des;
437extern struct enc_xform enc_xform_blf;
438extern struct enc_xform enc_xform_cast5;
439extern struct enc_xform enc_xform_skipjack;
440
441extern struct auth_hash auth_hash_hmac_md5_96;
442extern struct auth_hash auth_hash_hmac_sha1_96;
443extern struct auth_hash auth_hash_hmac_ripemd_160_96;
444
445extern TAILQ_HEAD(ipsec_policy_head, ipsec_policy) ipsec_policy_head;
446extern TAILQ_HEAD(ipsec_acquire_head, ipsec_acquire) ipsec_acquire_head;
447
448extern struct xformsw xformsw[], *xformswNXFORMSW;
449
450/* Check if a given tdb has encryption, authentication and/or tunneling */
451#define TDB_ATTRIB(x) (((x)->tdb_encalgxform ? NOTIFY_SATYPE_CONF : 0)| \
452		       ((x)->tdb_authalgxform ? NOTIFY_SATYPE_AUTH : 0))
453
454/* Traverse spi chain and get attributes */
455
456#define SPI_CHAIN_ATTRIB(have, TDB_DIR, TDBP) do {\
457	int s = spltdb(); \
458	struct tdb *tmptdb = (TDBP); \
459	\
460	(have) = 0; \
461	while (tmptdb && tmptdb->tdb_xform) { \
462	        if (tmptdb == NULL || tmptdb->tdb_flags & TDBF_INVALID) \
463	                break; \
464                (have) |= TDB_ATTRIB(tmptdb); \
465                tmptdb = tmptdb->TDB_DIR; \
466        } \
467	splx(s); \
468} while (0)
469
470/* Misc. */
471extern char *inet_ntoa4(struct in_addr);
472extern char *ipsp_address(union sockaddr_union);
473
474/* TDB management routines */
475extern void tdb_add_inp(struct tdb *, struct inpcb *, int);
476extern u_int32_t reserve_spi(u_int32_t, u_int32_t, union sockaddr_union *,
477			     union sockaddr_union *, u_int8_t, int *);
478extern struct tdb *gettdb(u_int32_t, union sockaddr_union *, u_int8_t);
479extern struct tdb *gettdbbyaddr(union sockaddr_union *, struct ipsec_policy *,
480				struct mbuf *, int);
481extern struct tdb *gettdbbysrc(union sockaddr_union *, struct ipsec_policy *,
482			       struct mbuf *, int);
483extern void puttdb(struct tdb *);
484extern void tdb_delete(struct tdb *);
485extern struct tdb *tdb_alloc(void);
486extern int tdb_init(struct tdb *, u_int16_t, struct ipsecinit *);
487extern int tdb_walk(int (*)(struct tdb *, void *, int), void *);
488
489/* XF_IP4 */
490extern int ipe4_attach(void);
491extern int ipe4_init(struct tdb *, struct xformsw *, struct ipsecinit *);
492extern int ipe4_zeroize(struct tdb *);
493extern int ipip_output(struct mbuf *, struct tdb *, struct mbuf **, int, int,
494		       struct tdb *);
495extern void ipe4_input __P((struct mbuf *, ...));
496extern void ipip_input __P((struct mbuf *, int));
497
498#ifdef INET
499extern void ip4_input __P((struct mbuf *, ...));
500#endif /* INET */
501
502#ifdef INET6
503extern int ip4_input6 __P((struct mbuf **, int *, int));
504#endif /* INET */
505
506/* XF_ETHERIP */
507extern int etherip_output(struct mbuf *, struct tdb *, struct mbuf **,
508			  int, int);
509extern void etherip_input __P((struct mbuf *, ...));
510
511/* XF_AH */
512extern int ah_attach(void);
513extern int ah_init(struct tdb *, struct xformsw *, struct ipsecinit *);
514extern int ah_zeroize(struct tdb *);
515extern int ah_output(struct mbuf *, struct tdb *, struct mbuf **, int, int,
516		     struct tdb *);
517extern int ah_output_cb(void *);
518extern int ah_input(struct mbuf *, struct tdb *, int, int);
519extern int ah_input_cb(void *);
520extern int ah_sysctl(int *, u_int, void *, size_t *, void *, size_t);
521extern int ah_massage_headers(struct mbuf **, int, int, int, int);
522
523#ifdef INET
524extern void ah4_input __P((struct mbuf *, ...));
525extern int ah4_input_cb __P((struct mbuf *, ...));
526#endif /* INET */
527
528#ifdef INET6
529extern int ah6_input __P((struct mbuf **, int *, int));
530extern int ah6_input_cb __P((struct mbuf *, int, int));
531#endif /* INET6 */
532
533/* XF_ESP */
534extern int esp_attach(void);
535extern int esp_init(struct tdb *, struct xformsw *, struct ipsecinit *);
536extern int esp_zeroize(struct tdb *);
537extern int esp_output(struct mbuf *, struct tdb *, struct mbuf **, int, int,
538		      struct tdb *);
539extern int esp_output_cb(void *);
540extern int esp_input(struct mbuf *, struct tdb *, int, int);
541extern int esp_input_cb(void *);
542extern int esp_sysctl(int *, u_int, void *, size_t *, void *, size_t);
543
544#ifdef INET
545extern void esp4_input __P((struct mbuf *, ...));
546extern int esp4_input_cb __P((struct mbuf *, ...));
547#endif /* INET */
548
549#ifdef INET6
550extern int esp6_input __P((struct mbuf **, int *, int));
551extern int esp6_input_cb __P((struct mbuf *, int, int));
552#endif /* INET6 */
553
554/* XF_TCPSIGNATURE */
555extern int tcp_signature_tdb_attach __P((void));
556extern int tcp_signature_tdb_init __P((struct tdb *, struct xformsw *,
557				       struct ipsecinit *));
558extern int tcp_signature_tdb_zeroize __P((struct tdb *));
559extern int tcp_signature_tdb_input __P((struct mbuf *, struct tdb *, int,
560					int));
561extern int tcp_signature_tdb_output __P((struct mbuf *, struct tdb *,
562					 struct mbuf **, int, int,
563					 struct tdb *));
564
565/* Padding */
566extern caddr_t m_pad(struct mbuf *, int);
567
568/* Replay window */
569extern int checkreplaywindow32(u_int32_t, u_int32_t, u_int32_t *, u_int32_t,
570                               u_int32_t *);
571
572extern unsigned char ipseczeroes[];
573
574/* Packet processing */
575extern int ipsp_process_packet(struct mbuf *, struct tdb *, int, int,
576			       struct tdb *);
577extern int ipsp_process_done(struct mbuf *, struct tdb *, struct tdb *);
578extern struct tdb *ipsp_spd_lookup(struct mbuf *, int, int, int *, int,
579                                   struct tdb *, struct inpcb *);
580extern int ipsec_common_input_cb(struct mbuf *, struct tdb *, int, int,
581				 struct m_tag *);
582extern int ipsp_acquire_sa(struct ipsec_policy *, union sockaddr_union *,
583			   union sockaddr_union *, struct sockaddr_encap *,
584			   struct mbuf *);
585extern struct ipsec_policy *ipsec_add_policy(struct sockaddr_encap *,
586					     struct sockaddr_encap *,
587					     union sockaddr_union *, int, int);
588extern int ipsp_match_policy(struct tdb *, struct ipsec_policy *,
589			     struct mbuf *, int);
590extern int ipsec_delete_policy(struct ipsec_policy *);
591extern void ipsp_acquire_expirations(void *);
592extern struct ipsec_acquire *ipsp_pending_acquire(union sockaddr_union *);
593extern struct ipsec_acquire *ipsec_get_acquire(u_int32_t);
594extern void ipsp_delete_acquire(struct ipsec_acquire *);
595extern void ipsp_clear_acquire(struct tdb *);
596extern void *ipsp_copy_ident(void *);
597extern int ipsp_is_unspecified(union sockaddr_union);
598extern void ipsp_reffree(struct ipsec_ref *);
599#endif /* _KERNEL */
600#endif /* _NETINET_IPSP_H_ */
601