2 * The authors of this code are John Ioannidis (ji@tla.org),
3 * Angelos D. Keromytis (kermit@csd.uch.gr) and
4 * Niels Provos (provos@physnet.uni-hamburg.de).
6 * This code was written by John Ioannidis for BSD/OS in Athens, Greece,
9 * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
10 * by Angelos D. Keromytis.
12 * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
15 * Copyright (C) 1995, 1996, 1997, 1998 by John Ioannidis, Angelos D. Keromytis
17 * Copyright (c) 2001, Angelos D. Keromytis, Niels Provos.
19 * Permission to use, copy, and modify this software with or without fee
20 * is hereby granted, provided that this entire notice is included in
21 * all copies of any software which is or includes a copy or
22 * modification of this software.
23 * You may use this code under the GNU public license if you so wish. Please
24 * contribute changes back to the authors under this freer than GPL license
25 * so that we may further the use of strong encryption without limitations to
28 * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
29 * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
30 * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
31 * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
34 * $OpenBSD: if_pflog.c,v 1.26 2007/10/18 21:58:18 mpf Exp $
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD$");
41 #include "opt_inet6.h"
45 #include <sys/param.h>
46 #include <sys/kernel.h>
48 #include <sys/module.h>
50 #include <sys/socket.h>
51 #include <sys/sockio.h>
55 #include <net/if_var.h>
56 #include <net/if_clone.h>
57 #include <net/if_pflog.h>
58 #include <net/if_types.h>
60 #include <net/pfvar.h>
62 #if defined(INET) || defined(INET6)
63 #include <netinet/in.h>
66 #include <netinet/in_var.h>
67 #include <netinet/ip.h>
71 #include <netinet6/in6_var.h>
72 #include <netinet6/nd6.h>
76 #include <machine/in_cksum.h>
79 #define PFLOGMTU (32768 + MHLEN + MLEN)
82 #define DPRINTF(x) do { if (pflogdebug) printf x ; } while (0)
87 static int pflogoutput(struct ifnet *, struct mbuf *,
88 const struct sockaddr *, struct route *);
89 static void pflogattach(int);
90 static int pflogioctl(struct ifnet *, u_long, caddr_t);
91 static void pflogstart(struct ifnet *);
92 static int pflog_clone_create(struct if_clone *, int, caddr_t);
93 static void pflog_clone_destroy(struct ifnet *);
94 static struct if_clone *pflog_cloner;
96 static const char pflogname[] = "pflog";
98 struct ifnet *pflogifs[PFLOGIFS_MAX]; /* for fast access */
101 pflogattach(int npflog)
104 for (i = 0; i < PFLOGIFS_MAX; i++)
106 pflog_cloner = if_clone_simple(pflogname, pflog_clone_create,
107 pflog_clone_destroy, 1);
111 pflog_clone_create(struct if_clone *ifc, int unit, caddr_t param)
115 if (unit >= PFLOGIFS_MAX)
118 ifp = if_alloc(IFT_PFLOG);
122 if_initname(ifp, pflogname, unit);
123 ifp->if_mtu = PFLOGMTU;
124 ifp->if_ioctl = pflogioctl;
125 ifp->if_output = pflogoutput;
126 ifp->if_start = pflogstart;
127 ifp->if_snd.ifq_maxlen = ifqmaxlen;
128 ifp->if_hdrlen = PFLOG_HDRLEN;
131 bpfattach(ifp, DLT_PFLOG, PFLOG_HDRLEN);
133 pflogifs[unit] = ifp;
139 pflog_clone_destroy(struct ifnet *ifp)
143 for (i = 0; i < PFLOGIFS_MAX; i++)
144 if (pflogifs[i] == ifp)
153 * Start output on the pflog interface.
156 pflogstart(struct ifnet *ifp)
161 IF_LOCK(&ifp->if_snd);
162 _IF_DEQUEUE(&ifp->if_snd, m);
163 IF_UNLOCK(&ifp->if_snd);
173 pflogoutput(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
182 pflogioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
186 if (ifp->if_flags & IFF_UP)
187 ifp->if_drv_flags |= IFF_DRV_RUNNING;
189 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
199 pflog_packet(struct pfi_kif *kif, struct mbuf *m, sa_family_t af, u_int8_t dir,
200 u_int8_t reason, struct pf_rule *rm, struct pf_rule *am,
201 struct pf_ruleset *ruleset, struct pf_pdesc *pd, int lookupsafe)
206 if (kif == NULL || m == NULL || rm == NULL || pd == NULL)
209 if ((ifn = pflogifs[rm->logif]) == NULL || !ifn->if_bpf)
212 bzero(&hdr, sizeof(hdr));
213 hdr.length = PFLOG_REAL_HDRLEN;
215 hdr.action = rm->action;
217 memcpy(hdr.ifname, kif->pfik_name, sizeof(hdr.ifname));
220 hdr.rulenr = htonl(rm->nr);
223 hdr.rulenr = htonl(am->nr);
224 hdr.subrulenr = htonl(rm->nr);
225 if (ruleset != NULL && ruleset->anchor != NULL)
226 strlcpy(hdr.ruleset, ruleset->anchor->name,
227 sizeof(hdr.ruleset));
230 * XXXGL: we avoid pf_socket_lookup() when we are holding
231 * state lock, since this leads to unsafe LOR.
232 * These conditions are very very rare, however.
234 if (rm->log & PF_LOG_SOCKET_LOOKUP && !pd->lookup.done && lookupsafe)
235 pd->lookup.done = pf_socket_lookup(dir, pd, m);
236 if (pd->lookup.done > 0)
237 hdr.uid = pd->lookup.uid;
241 hdr.rule_uid = rm->cuid;
242 hdr.rule_pid = rm->cpid;
246 if (af == AF_INET && dir == PF_OUT) {
249 ip = mtod(m, struct ip *);
251 ip->ip_sum = in_cksum(m, ip->ip_hl << 2);
255 if_inc_counter(ifn, IFCOUNTER_OPACKETS, 1);
256 if_inc_counter(ifn, IFCOUNTER_OBYTES, m->m_pkthdr.len);
257 BPF_MTAP2(ifn, &hdr, PFLOG_HDRLEN, m);
263 pflog_modevent(module_t mod, int type, void *data)
271 pflog_packet_ptr = pflog_packet;
276 pflog_packet_ptr = NULL;
278 if_clone_detach(pflog_cloner);
288 static moduledata_t pflog_mod = { pflogname, pflog_modevent, 0 };
290 #define PFLOG_MODVER 1
292 DECLARE_MODULE(pflog, pflog_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
293 MODULE_VERSION(pflog, PFLOG_MODVER);
294 MODULE_DEPEND(pflog, pf, PF_MODVER, PF_MODVER, PF_MODVER);