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
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
|
/* $FreeBSD$ */
/* $OpenBSD: if_pflog.c,v 1.9 2003/05/14 08:42:00 canacar 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.
* Copyright (c) 2001, Angelos D. Keromytis, Niels Provos.
*
* Permission to use, copy, and modify this software with or 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.
*/
#ifdef __FreeBSD__
#include "opt_inet.h"
#include "opt_inet6.h"
#endif
#ifndef __FreeBSD__
#include "bpfilter.h"
#include "pflog.h"
#elif __FreeBSD__ >= 5
#include "opt_bpf.h"
#include "opt_pf.h"
#define NBPFILTER DEV_BPF
#define NPFLOG DEV_PFLOG
#endif
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#ifdef __FreeBSD__
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/sockio.h>
#else
#include <sys/ioctl.h>
#endif
#include <net/if.h>
#include <net/if_types.h>
#include <net/route.h>
#include <net/bpf.h>
#ifdef INET
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#endif
#ifdef __FreeBSD__
#include <machine/in_cksum.h>
#endif
#ifdef INET6
#ifndef INET
#include <netinet/in.h>
#endif
#include <netinet6/nd6.h>
#endif /* INET6 */
#include <net/pfvar.h>
#include <net/if_pflog.h>
#ifdef __FreeBSD__
#define PFLOGNAME "pflog"
#endif
#define PFLOGMTU (32768 + MHLEN + MLEN)
#ifdef PFLOGDEBUG
#define DPRINTF(x) do { if (pflogdebug) printf x ; } while (0)
#else
#define DPRINTF(x)
#endif
#ifndef __FreeBSD__
struct pflog_softc pflogif[NPFLOG];
#endif
#ifdef __FreeBSD__
void pflog_clone_destroy(struct ifnet *);
int pflog_clone_create(struct if_clone *, int);
#else
void pflogattach(int);
#endif
int pflogoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
struct rtentry *);
int pflogioctl(struct ifnet *, u_long, caddr_t);
void pflogrtrequest(int, struct rtentry *, struct sockaddr *);
void pflogstart(struct ifnet *);
#ifndef __FreeBSD__
extern int ifqmaxlen;
#endif
#ifdef __FreeBSD__
static MALLOC_DEFINE(M_PFLOG, PFLOGNAME, "Packet Filter Logging Interface");
static LIST_HEAD(pflog_list, pflog_softc) pflog_list;
struct if_clone pflog_cloner = IF_CLONE_INITIALIZER(PFLOGNAME,
pflog_clone_create, pflog_clone_destroy, 1, IF_MAXUNIT);
void
pflog_clone_destroy(struct ifnet *ifp)
{
struct pflog_softc *sc;
sc = ifp->if_softc;
/*
* Does we really need this?
*/
IF_DRAIN(&ifp->if_snd);
bpfdetach(ifp);
if_detach(ifp);
LIST_REMOVE(sc, sc_next);
free(sc, M_PFLOG);
}
int
pflog_clone_create(struct if_clone *ifc, int unit)
{
struct pflog_softc *sc;
MALLOC(sc, struct pflog_softc *, sizeof(*sc), M_PFLOG, M_WAITOK|M_ZERO);
#if (__FreeBSD_version < 501113)
sc->sc_if.if_name = PFLOGNAME;
sc->sc_if.if_unit = unit;
#else
if_initname(&sc->sc_if, ifc->ifc_name, unit);
#endif
sc->sc_if.if_mtu = PFLOGMTU;
sc->sc_if.if_ioctl = pflogioctl;
sc->sc_if.if_output = pflogoutput;
sc->sc_if.if_start = pflogstart;
sc->sc_if.if_type = IFT_PFLOG;
sc->sc_if.if_snd.ifq_maxlen = ifqmaxlen;
sc->sc_if.if_hdrlen = PFLOG_HDRLEN;
sc->sc_if.if_softc = sc;
/*
* We would get a message like
* "in6_ifattach: pflog0 is not multicast capable, IPv6 not enabled".
* We need a patch to in6_ifattach() to exclude interface type
* IFT_PFLOG.
*/
if_attach(&sc->sc_if);
LIST_INSERT_HEAD(&pflog_list, sc, sc_next);
#if NBPFILTER > 0
bpfattach(&sc->sc_if, DLT_PFLOG, PFLOG_HDRLEN);
#endif
return (0);
}
#else /* !__FreeBSD__ */
void
pflogattach(int npflog)
{
struct ifnet *ifp;
int i;
bzero(pflogif, sizeof(pflogif));
for (i = 0; i < NPFLOG; i++) {
ifp = &pflogif[i].sc_if;
snprintf(ifp->if_xname, sizeof ifp->if_xname, "pflog%d", i);
ifp->if_softc = &pflogif[i];
ifp->if_mtu = PFLOGMTU;
ifp->if_ioctl = pflogioctl;
ifp->if_output = pflogoutput;
ifp->if_start = pflogstart;
ifp->if_type = IFT_PFLOG;
ifp->if_snd.ifq_maxlen = ifqmaxlen;
ifp->if_hdrlen = PFLOG_HDRLEN;
if_attach(ifp);
if_alloc_sadl(ifp);
#if NBPFILTER > 0
bpfattach(&pflogif[i].sc_if.if_bpf, ifp, DLT_PFLOG,
PFLOG_HDRLEN);
#endif
}
}
#endif /* __FreeBSD__ */
/*
* Start output on the pflog interface.
*/
void
pflogstart(struct ifnet *ifp)
{
struct mbuf *m;
#if defined(__FreeBSD__) && defined(ALTQ)
struct ifaltq *ifq;
#else
struct ifqueue *ifq;
#endif
int s;
#ifdef __FreeBSD__
ifq = &ifp->if_snd;
#endif
for (;;) {
s = splimp();
#ifdef __FreeBSD__
IF_LOCK(ifq);
_IF_DROP(ifq);
_IF_DEQUEUE(ifq, m);
IF_UNLOCK(ifq);
#else
IF_DROP(&ifp->if_snd);
IF_DEQUEUE(&ifp->if_snd, m);
#endif
splx(s);
if (m == NULL)
return;
else
m_freem(m);
}
}
int
pflogoutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
struct rtentry *rt)
{
m_freem(m);
return (0);
}
/* ARGSUSED */
void
pflogrtrequest(int cmd, struct rtentry *rt, struct sockaddr *sa)
{
if (rt)
rt->rt_rmx.rmx_mtu = PFLOGMTU;
}
/* ARGSUSED */
int
pflogioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
{
switch (cmd) {
case SIOCSIFADDR:
case SIOCAIFADDR:
case SIOCSIFDSTADDR:
case SIOCSIFFLAGS:
if (ifp->if_flags & IFF_UP)
ifp->if_flags |= IFF_RUNNING;
else
ifp->if_flags &= ~IFF_RUNNING;
break;
default:
return (EINVAL);
}
return (0);
}
int
pflog_packet(struct ifnet *ifp, struct mbuf *m, sa_family_t af, u_int8_t dir,
u_int8_t reason, struct pf_rule *rm, struct pf_rule *am,
struct pf_ruleset *ruleset)
{
#if NBPFILTER > 0
struct ifnet *ifn;
struct pfloghdr hdr;
struct mbuf m1;
if (ifp == NULL || m == NULL || rm == NULL)
return (-1);
hdr.length = PFLOG_REAL_HDRLEN;
hdr.af = af;
hdr.action = rm->action;
hdr.reason = reason;
#if defined(__FreeBSD__) && (__FreeBSD_version < 501113)
snprintf(hdr.ifname, IFNAMSIZ, "%s%d", ifp->if_name, ifp->if_unit);
#else
memcpy(hdr.ifname, ifp->if_xname, sizeof(hdr.ifname));
#endif
if (am == NULL) {
hdr.rulenr = htonl(rm->nr);
hdr.subrulenr = -1;
bzero(hdr.ruleset, sizeof(hdr.ruleset));
} else {
hdr.rulenr = htonl(am->nr);
hdr.subrulenr = htonl(rm->nr);
if (ruleset == NULL)
bzero(hdr.ruleset, sizeof(hdr.ruleset));
else
memcpy(hdr.ruleset, ruleset->name,
sizeof(hdr.ruleset));
}
hdr.dir = dir;
#ifdef INET
if (af == AF_INET && dir == PF_OUT) {
struct ip *ip;
ip = mtod(m, struct ip *);
ip->ip_sum = 0;
ip->ip_sum = in_cksum(m, ip->ip_hl << 2);
}
#endif /* INET */
m1.m_next = m;
m1.m_len = PFLOG_HDRLEN;
m1.m_data = (char *) &hdr;
#ifdef __FreeBSD__
KASSERT((!LIST_EMPTY(&pflog_list)), ("pflog: no interface"));
ifn = &LIST_FIRST(&pflog_list)->sc_if;
#else
ifn = &(pflogif[0].sc_if);
#endif
if (ifn->if_bpf)
bpf_mtap(ifn->if_bpf, &m1);
#endif
return (0);
}
#ifdef __FreeBSD__
static int
pflog_modevent(module_t mod, int type, void *data)
{
int error = 0;
switch (type) {
case MOD_LOAD:
LIST_INIT(&pflog_list);
if_clone_attach(&pflog_cloner);
break;
case MOD_UNLOAD:
if_clone_detach(&pflog_cloner);
while (!LIST_EMPTY(&pflog_list))
pflog_clone_destroy(
&LIST_FIRST(&pflog_list)->sc_if);
break;
default:
error = EINVAL;
break;
}
return error;
}
static moduledata_t pflog_mod = {
"pflog",
pflog_modevent,
0
};
#define PFLOG_MODVER 1
DECLARE_MODULE(pflog, pflog_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
MODULE_VERSION(pflog, PFLOG_MODVER);
#endif /* __FreeBSD__ */
|