1 /* $OpenBSD: if_pflog.c,v 1.27 2007/12/20 02:53:02 brad Exp $ */
3 * The authors of this code are John Ioannidis (ji@tla.org),
4 * Angelos D. Keromytis (kermit@csd.uch.gr) and
5 * Niels Provos (provos@physnet.uni-hamburg.de).
7 * This code was written by John Ioannidis for BSD/OS in Athens, Greece,
10 * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
11 * by Angelos D. Keromytis.
13 * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
16 * Copyright (C) 1995, 1996, 1997, 1998 by John Ioannidis, Angelos D. Keromytis
18 * Copyright (c) 2001, Angelos D. Keromytis, Niels Provos.
20 * Copyright (c) 2010 The DragonFly Project. All rights reserved.
22 * Permission to use, copy, and modify this software with or without fee
23 * is hereby granted, provided that this entire notice is included in
24 * all copies of any software which is or includes a copy or
25 * modification of this software.
26 * You may use this code under the GNU public license if you so wish. Please
27 * contribute changes back to the authors under this freer than GPL license
28 * so that we may further the use of strong encryption without limitations to
31 * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
32 * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
33 * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
34 * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
39 #include "opt_inet6.h"
41 #include <sys/param.h>
42 #include <sys/systm.h>
43 #include <sys/in_cksum.h>
46 #include <sys/socket.h>
47 #include <sys/kernel.h>
48 #include <sys/malloc.h>
49 #include <sys/module.h>
50 #include <sys/sockio.h>
51 #include <sys/thread2.h>
54 #include <net/if_types.h>
55 #include <net/ifq_var.h>
56 #include <net/route.h>
60 #include <netinet/in.h>
61 #include <netinet/in_var.h>
62 #include <netinet/in_systm.h>
63 #include <netinet/ip.h>
68 #include <netinet/in.h>
70 #include <netinet6/nd6.h>
73 #include <net/pf/pfvar.h>
74 #include <net/pf/if_pflog.h>
76 #define PFLOGNAME "pflog"
78 #define PFLOGMTU (32768 + MHLEN + MLEN)
81 #define DPRINTF(x) do { if (pflogdebug) kprintf x ; } while (0)
86 void pflogattach(int);
87 int pflogoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
89 int pflogioctl(struct ifnet *, u_long, caddr_t, struct ucred *);
90 void pflogrtrequest(int, struct rtentry *, struct sockaddr *);
91 void pflogstart(struct ifnet *, struct ifaltq_subque *);
92 int pflog_clone_create(struct if_clone *, int, caddr_t);
93 int pflog_clone_destroy(struct ifnet *);
95 LIST_HEAD(, pflog_softc) pflogif_list;
96 struct if_clone pflog_cloner =
97 IF_CLONE_INITIALIZER("pflog", pflog_clone_create, pflog_clone_destroy, 1, 1);
99 struct ifnet *pflogifs[PFLOGIFS_MAX]; /* for fast access */
102 pflogattach(int npflog)
105 LIST_INIT(&pflogif_list);
106 for (i = 0; i < PFLOGIFS_MAX; i++)
108 if_clone_attach(&pflog_cloner);
112 pflog_clone_create(struct if_clone *ifc, int unit, caddr_t param __unused)
115 struct pflog_softc *pflogif;
117 lwkt_gettoken(&pf_token);
119 if (unit >= PFLOGIFS_MAX) {
120 lwkt_reltoken(&pf_token);
124 if ((pflogif = kmalloc(sizeof(*pflogif),
125 M_DEVBUF, M_WAITOK|M_ZERO)) == NULL) {
126 lwkt_reltoken(&pf_token);
130 pflogif->sc_unit = unit;
131 lwkt_reltoken(&pf_token);
132 ifp = &pflogif->sc_if;
133 ksnprintf(ifp->if_xname, sizeof ifp->if_xname, "pflog%d", unit);
134 ifp->if_softc = pflogif;
135 ifp->if_mtu = PFLOGMTU;
136 ifp->if_ioctl = pflogioctl;
137 ifp->if_output = pflogoutput;
138 ifp->if_start = pflogstart;
139 ifp->if_type = IFT_PFLOG;
140 ifq_set_maxlen(&ifp->if_snd, ifqmaxlen);
141 ifp->if_hdrlen = PFLOG_HDRLEN;
142 if_attach(ifp, NULL);
144 bpfattach(&pflogif->sc_if, DLT_PFLOG, PFLOG_HDRLEN);
145 lwkt_gettoken(&pf_token);
148 LIST_INSERT_HEAD(&pflogif_list, pflogif, sc_list);
149 pflogifs[unit] = ifp;
152 lwkt_reltoken(&pf_token);
157 pflog_clone_destroy(struct ifnet *ifp)
159 struct pflog_softc *pflogif = ifp->if_softc;
161 lwkt_gettoken(&pf_token);
164 pflogifs[pflogif->sc_unit] = NULL;
165 LIST_REMOVE(pflogif, sc_list);
168 lwkt_reltoken(&pf_token);
173 lwkt_gettoken(&pf_token);
174 kfree(pflogif, M_DEVBUF);
175 lwkt_reltoken(&pf_token);
181 * Start output on the pflog interface.
184 pflogstart(struct ifnet *ifp, struct ifaltq_subque *ifsq)
188 ASSERT_ALTQ_SQ_DEFAULT(ifp, ifsq);
189 ASSERT_LWKT_TOKEN_HELD(&pf_token);
192 m = ifsq_dequeue(ifsq);
201 pflogoutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
210 pflogrtrequest(int cmd, struct rtentry *rt, struct sockaddr *sa)
213 rt->rt_rmx.rmx_mtu = PFLOGMTU;
218 pflogioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr)
221 lwkt_gettoken(&pf_token);
225 lwkt_reltoken(&pf_token);
226 if (ifp->if_flags & IFF_UP)
227 ifp->if_flags |= IFF_RUNNING;
229 ifp->if_flags &= ~IFF_RUNNING;
230 lwkt_gettoken(&pf_token);
233 lwkt_reltoken(&pf_token);
237 lwkt_reltoken(&pf_token);
242 pflog_packet(struct pfi_kif *kif, struct mbuf *m, sa_family_t af, u_int8_t dir,
243 u_int8_t reason, struct pf_rule *rm, struct pf_rule *am,
244 struct pf_ruleset *ruleset, struct pf_pdesc *pd)
246 struct ifnet *ifn = NULL;
249 ASSERT_LWKT_TOKEN_HELD(&pf_token);
251 if (kif == NULL || m == NULL || rm == NULL)
254 if ((ifn = pflogifs[rm->logif]) == NULL || !ifn->if_bpf)
257 bzero(&hdr, sizeof(hdr));
258 hdr.length = PFLOG_REAL_HDRLEN;
260 hdr.action = rm->action;
262 memcpy(hdr.ifname, kif->pfik_name, sizeof(hdr.ifname));
265 hdr.rulenr = htonl(rm->nr);
268 hdr.rulenr = htonl(am->nr);
269 hdr.subrulenr = htonl(rm->nr);
270 if (ruleset != NULL && ruleset->anchor != NULL)
271 strlcpy(hdr.ruleset, ruleset->anchor->name,
272 sizeof(hdr.ruleset));
274 if (rm->log & PF_LOG_SOCKET_LOOKUP && !pd->lookup.done)
275 pd->lookup.done = pf_socket_lookup(dir, pd);
276 if (pd->lookup.done > 0) {
277 hdr.uid = pd->lookup.uid;
278 hdr.pid = pd->lookup.pid;
283 hdr.rule_uid = rm->cuid;
284 hdr.rule_pid = rm->cpid;
290 ip = mtod(m, struct ip *);
291 ip->ip_len = htons(ip->ip_len);
292 ip->ip_off = htons(ip->ip_off);
296 ip->ip_sum = in_cksum(m, ip->ip_hl << 2);
301 IFNET_STAT_INC(ifn, opackets, 1);
302 IFNET_STAT_INC(ifn, obytes, m->m_pkthdr.len);
306 bpf_mtap_hdr(ifn->if_bpf, (char *)&hdr, PFLOG_HDRLEN, m,
314 struct ip *ip = mtod(m, struct ip *);
316 ip->ip_len = ntohs(ip->ip_len);
317 ip->ip_off = ntohs(ip->ip_off);
325 pflog_modevent(module_t mod, int type, void *data)
329 struct pflog_softc *pflogif, *tmp;
331 lwkt_gettoken(&pf_token);
335 LIST_INIT(&pflogif_list);
336 lwkt_reltoken(&pf_token);
337 if_clone_attach(&pflog_cloner);
338 lwkt_gettoken(&pf_token);
342 lwkt_reltoken(&pf_token);
343 if_clone_detach(&pflog_cloner);
344 LIST_FOREACH_MUTABLE(pflogif, &pflogif_list, sc_list, tmp) {
345 pflog_clone_destroy(&pflogif->sc_if);
347 lwkt_gettoken(&pf_token);
354 lwkt_reltoken(&pf_token);
358 static moduledata_t pflog_mod = {
364 DECLARE_MODULE(pflog, pflog_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
365 MODULE_VERSION(pflog, PFLOG_MODVER);