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1 /*      $OpenBSD: if_pfsync.h,v 1.35 2008/06/29 08:42:15 mcbride Exp $  */
2
3 /*
4  * Copyright (c) 2001 Michael Shalayeff
5  * All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19  * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
20  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
22  * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
24  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
25  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
26  * THE POSSIBILITY OF SUCH DAMAGE.
27  */
28
29 /*
30  * Copyright (c) 2008 David Gwynne <dlg@openbsd.org>
31  *
32  * Permission to use, copy, modify, and distribute this software for any
33  * purpose with or without fee is hereby granted, provided that the above
34  * copyright notice and this permission notice appear in all copies.
35  *
36  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
37  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
38  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
39  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
40  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
41  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
42  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
43  */
44
45 #ifndef _NET_IF_PFSYNC_H_
46 #define _NET_IF_PFSYNC_H_
47
48 #define PFSYNC_VERSION          5
49 #define PFSYNC_DFLTTL           255
50
51 #define PFSYNC_ACT_CLR          0       /* clear all states */
52 #define PFSYNC_ACT_INS          1       /* insert state */
53 #define PFSYNC_ACT_INS_ACK      2       /* ack of insterted state */
54 #define PFSYNC_ACT_UPD          3       /* update state */
55 #define PFSYNC_ACT_UPD_C        4       /* "compressed" update state */
56 #define PFSYNC_ACT_UPD_REQ      5       /* request "uncompressed" state */
57 #define PFSYNC_ACT_DEL          6       /* delete state */
58 #define PFSYNC_ACT_DEL_C        7       /* "compressed" delete state */
59 #define PFSYNC_ACT_INS_F        8       /* insert fragment */
60 #define PFSYNC_ACT_DEL_F        9       /* delete fragments */
61 #define PFSYNC_ACT_BUS          10      /* bulk update status */
62 #define PFSYNC_ACT_TDB          11      /* TDB replay counter update */
63 #define PFSYNC_ACT_EOF          12      /* end of frame */
64 #define PFSYNC_ACT_MAX          13
65
66 #define PFSYNC_ACTIONS          "CLR ST",               \
67                                 "INS ST",               \
68                                 "INS ST ACK",           \
69                                 "UPD ST",               \
70                                 "UPD ST COMP",          \
71                                 "UPD ST REQ",           \
72                                 "DEL ST",               \
73                                 "DEL ST COMP",          \
74                                 "INS FR",               \
75                                 "DEL FR",               \
76                                 "BULK UPD STAT",        \
77                                 "TDB UPD",              \
78                                 "EOF"
79
80 #define PFSYNC_HMAC_LEN 20
81
82 /*
83  * A pfsync frame is built from a header followed by several sections which
84  * are all prefixed with their own subheaders. Frames must be terminated with
85  * an EOF subheader.
86  *
87  * | ...                        |
88  * | IP header                  |
89  * +============================+
90  * | pfsync_header              |
91  * +----------------------------+
92  * | pfsync_subheader           |
93  * +----------------------------+
94  * | first action fields        |
95  * | ...                        |
96  * +----------------------------+
97  * | pfsync_subheader           |
98  * +----------------------------+
99  * | second action fields       |
100  * | ...                        |
101  * +----------------------------+
102  * | EOF pfsync_subheader       |
103  * +----------------------------+
104  * | HMAC                       |
105  * +============================+
106  */
107
108 /*
109  * Frame header
110  */
111
112 struct pfsync_header {
113         u_int8_t                        version;
114         u_int8_t                        _pad;
115         u_int16_t                       len;
116         u_int8_t                        pfcksum[PF_MD5_DIGEST_LENGTH];
117 } __packed;
118
119 /*
120  * Frame region subheader
121  */
122
123 struct pfsync_subheader {
124         u_int8_t                        action;
125         u_int8_t                        _pad;
126         u_int16_t                       count;
127 } __packed;
128
129 /*
130  * CLR
131  */
132
133 struct pfsync_clr {
134         char                            ifname[IFNAMSIZ];
135         u_int32_t                       creatorid;
136 } __packed;
137
138 /*
139  * INS, UPD, DEL
140  */
141
142 /* these use struct pfsync_state in pfvar.h */
143
144 /*
145  * INS_ACK
146  */
147
148 struct pfsync_ins_ack {
149         u_int64_t                       id;
150         u_int32_t                       creatorid;
151 } __packed;
152
153 /*
154  * UPD_C
155  */
156
157 struct pfsync_upd_c {
158         u_int64_t                       id;
159         struct pfsync_state_peer        src;
160         struct pfsync_state_peer        dst;
161         u_int32_t                       creatorid;
162         u_int32_t                       expire;
163         u_int8_t                        timeout;
164         u_int8_t                        _pad[3];
165 } __packed;
166
167 /*
168  * UPD_REQ
169  */
170
171 struct pfsync_upd_req {
172         u_int64_t                       id;
173         u_int32_t                       creatorid;
174 } __packed;
175
176 /*
177  * DEL_C
178  */
179
180 struct pfsync_del_c {
181         u_int64_t                       id;
182         u_int32_t                       creatorid;
183 } __packed;
184
185 /* 
186  * INS_F, DEL_F
187  */
188
189 /* not implemented (yet) */
190
191 /*
192  * BUS
193  */
194
195 struct pfsync_bus {
196         u_int32_t                       creatorid;
197         u_int32_t                       endtime;
198         u_int8_t                        status;
199 #define PFSYNC_BUS_START                        1
200 #define PFSYNC_BUS_END                          2
201         u_int8_t                        _pad[3];
202 } __packed;
203
204 /*
205  * TDB
206  */
207
208 struct pfsync_tdb {
209         u_int32_t                       spi;
210         union sockaddr_union            dst;
211         u_int32_t                       rpl;
212         u_int64_t                       cur_bytes;
213         u_int8_t                        sproto;
214         u_int8_t                        updates;
215         u_int8_t                        _pad[2];
216 } __packed;
217
218 /*
219  * EOF
220  */
221
222 struct pfsync_eof {
223         u_int8_t                        hmac[PFSYNC_HMAC_LEN];
224 } __packed;
225
226 #define PFSYNC_HDRLEN           sizeof(struct pfsync_header)
227
228
229
230 /*
231  * Names for PFSYNC sysctl objects
232  */
233 #define PFSYNCCTL_STATS         1       /* PFSYNC stats */
234 #define PFSYNCCTL_MAXID         2
235
236 #define PFSYNCCTL_NAMES { \
237         { 0, 0 }, \
238         { "stats", CTLTYPE_STRUCT }, \
239 }
240
241 struct pfsyncstats {
242         u_int64_t       pfsyncs_ipackets;       /* total input packets, IPv4 */
243         u_int64_t       pfsyncs_ipackets6;      /* total input packets, IPv6 */
244         u_int64_t       pfsyncs_badif;          /* not the right interface */
245         u_int64_t       pfsyncs_badttl;         /* TTL is not PFSYNC_DFLTTL */
246         u_int64_t       pfsyncs_hdrops;         /* packets shorter than hdr */
247         u_int64_t       pfsyncs_badver;         /* bad (incl unsupp) version */
248         u_int64_t       pfsyncs_badact;         /* bad action */
249         u_int64_t       pfsyncs_badlen;         /* data length does not match */
250         u_int64_t       pfsyncs_badauth;        /* bad authentication */
251         u_int64_t       pfsyncs_stale;          /* stale state */
252         u_int64_t       pfsyncs_badval;         /* bad values */
253         u_int64_t       pfsyncs_badstate;       /* insert/lookup failed */
254
255         u_int64_t       pfsyncs_opackets;       /* total output packets, IPv4 */
256         u_int64_t       pfsyncs_opackets6;      /* total output packets, IPv6 */
257         u_int64_t       pfsyncs_onomem;         /* no memory for an mbuf */
258         u_int64_t       pfsyncs_oerrors;        /* ip output error */
259 };
260
261 /*
262  * Configuration structure for SIOCSETPFSYNC SIOCGETPFSYNC
263  */
264 struct pfsyncreq {
265         char             pfsyncr_syncdev[IFNAMSIZ];
266         struct in_addr   pfsyncr_syncpeer;
267         int              pfsyncr_maxupdates;
268         int              pfsyncr_authlevel;
269 };
270
271 #ifdef __FreeBSD__
272 #define SIOCSETPFSYNC   _IOW('i', 247, struct ifreq)
273 #define SIOCGETPFSYNC   _IOWR('i', 248, struct ifreq)
274 #endif
275
276 #ifdef _KERNEL
277
278 /*
279  * this shows where a pf state is with respect to the syncing.
280  */
281 #define PFSYNC_S_INS    0x00
282 #define PFSYNC_S_IACK   0x01
283 #define PFSYNC_S_UPD    0x02
284 #define PFSYNC_S_UPD_C  0x03
285 #define PFSYNC_S_DEL    0x04
286 #define PFSYNC_S_COUNT  0x05
287
288 #define PFSYNC_S_DEFER  0xfe
289 #define PFSYNC_S_NONE   0xff
290
291 #ifdef __FreeBSD__
292 void                    pfsync_input(struct mbuf *, __unused int);
293 #else
294 void                    pfsync_input(struct mbuf *, ...);
295 #endif
296 int                     pfsync_sysctl(int *, u_int,  void *, size_t *,
297                             void *, size_t);
298
299 #define PFSYNC_SI_IOCTL         0x01
300 #define PFSYNC_SI_CKSUM         0x02
301 #define PFSYNC_SI_ACK           0x04
302 int                     pfsync_state_import(struct pfsync_state *, u_int8_t);
303 #ifndef __FreeBSD__
304 void                    pfsync_state_export(struct pfsync_state *,
305                             struct pf_state *);
306 #endif
307
308 void                    pfsync_insert_state(struct pf_state *);
309 void                    pfsync_update_state(struct pf_state *);
310 void                    pfsync_delete_state(struct pf_state *);
311 void                    pfsync_clear_states(u_int32_t, const char *);
312
313 #ifdef notyet
314 void                    pfsync_update_tdb(struct tdb *, int);
315 void                    pfsync_delete_tdb(struct tdb *);
316 #endif
317
318 int                     pfsync_defer(struct pf_state *, struct mbuf *);
319
320 int                     pfsync_up(void);
321 int                     pfsync_state_in_use(struct pf_state *);
322 #endif
323
324 #endif /* _NET_IF_PFSYNC_H_ */