294 lines
6.6 KiB
C
294 lines
6.6 KiB
C
/*-
|
|
* 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.
|
|
*
|
|
* $OpenBSD: if_pflog.c,v 1.26 2007/10/18 21:58:18 mpf Exp $
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include "opt_inet.h"
|
|
#include "opt_inet6.h"
|
|
#include "opt_bpf.h"
|
|
#include "opt_pf.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/mbuf.h>
|
|
#include <sys/module.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/sockio.h>
|
|
|
|
#include <net/bpf.h>
|
|
#include <net/if.h>
|
|
#include <net/if_clone.h>
|
|
#include <net/if_pflog.h>
|
|
#include <net/if_types.h>
|
|
#include <net/pfvar.h>
|
|
|
|
#if defined(INET) || defined(INET6)
|
|
#include <netinet/in.h>
|
|
#endif
|
|
#ifdef INET
|
|
#include <netinet/in_var.h>
|
|
#include <netinet/ip.h>
|
|
#endif
|
|
|
|
#ifdef INET6
|
|
#include <netinet6/in6_var.h>
|
|
#include <netinet6/nd6.h>
|
|
#endif /* INET6 */
|
|
|
|
#ifdef INET
|
|
#include <machine/in_cksum.h>
|
|
#endif /* INET */
|
|
|
|
#define PFLOGMTU (32768 + MHLEN + MLEN)
|
|
|
|
#ifdef PFLOGDEBUG
|
|
#define DPRINTF(x) do { if (pflogdebug) printf x ; } while (0)
|
|
#else
|
|
#define DPRINTF(x)
|
|
#endif
|
|
|
|
static int pflogoutput(struct ifnet *, struct mbuf *,
|
|
const struct sockaddr *, struct route *);
|
|
static void pflogattach(int);
|
|
static int pflogioctl(struct ifnet *, u_long, caddr_t);
|
|
static void pflogstart(struct ifnet *);
|
|
static int pflog_clone_create(struct if_clone *, int, caddr_t);
|
|
static void pflog_clone_destroy(struct ifnet *);
|
|
static struct if_clone *pflog_cloner;
|
|
|
|
static const char pflogname[] = "pflog";
|
|
|
|
struct ifnet *pflogifs[PFLOGIFS_MAX]; /* for fast access */
|
|
|
|
static void
|
|
pflogattach(int npflog)
|
|
{
|
|
int i;
|
|
for (i = 0; i < PFLOGIFS_MAX; i++)
|
|
pflogifs[i] = NULL;
|
|
pflog_cloner = if_clone_simple(pflogname, pflog_clone_create,
|
|
pflog_clone_destroy, 1);
|
|
}
|
|
|
|
static int
|
|
pflog_clone_create(struct if_clone *ifc, int unit, caddr_t param)
|
|
{
|
|
struct ifnet *ifp;
|
|
|
|
if (unit >= PFLOGIFS_MAX)
|
|
return (EINVAL);
|
|
|
|
ifp = if_alloc(IFT_PFLOG);
|
|
if (ifp == NULL) {
|
|
return (ENOSPC);
|
|
}
|
|
if_initname(ifp, pflogname, unit);
|
|
ifp->if_mtu = PFLOGMTU;
|
|
ifp->if_ioctl = pflogioctl;
|
|
ifp->if_output = pflogoutput;
|
|
ifp->if_start = pflogstart;
|
|
ifp->if_snd.ifq_maxlen = ifqmaxlen;
|
|
ifp->if_hdrlen = PFLOG_HDRLEN;
|
|
if_attach(ifp);
|
|
|
|
bpfattach(ifp, DLT_PFLOG, PFLOG_HDRLEN);
|
|
|
|
pflogifs[unit] = ifp;
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
pflog_clone_destroy(struct ifnet *ifp)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < PFLOGIFS_MAX; i++)
|
|
if (pflogifs[i] == ifp)
|
|
pflogifs[i] = NULL;
|
|
|
|
bpfdetach(ifp);
|
|
if_detach(ifp);
|
|
if_free(ifp);
|
|
}
|
|
|
|
/*
|
|
* Start output on the pflog interface.
|
|
*/
|
|
static void
|
|
pflogstart(struct ifnet *ifp)
|
|
{
|
|
struct mbuf *m;
|
|
|
|
for (;;) {
|
|
IF_LOCK(&ifp->if_snd);
|
|
_IF_DROP(&ifp->if_snd);
|
|
_IF_DEQUEUE(&ifp->if_snd, m);
|
|
IF_UNLOCK(&ifp->if_snd);
|
|
|
|
if (m == NULL)
|
|
return;
|
|
else
|
|
m_freem(m);
|
|
}
|
|
}
|
|
|
|
static int
|
|
pflogoutput(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
|
|
struct route *rt)
|
|
{
|
|
m_freem(m);
|
|
return (0);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static int
|
|
pflogioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
|
|
{
|
|
switch (cmd) {
|
|
case SIOCSIFFLAGS:
|
|
if (ifp->if_flags & IFF_UP)
|
|
ifp->if_drv_flags |= IFF_DRV_RUNNING;
|
|
else
|
|
ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
|
|
break;
|
|
default:
|
|
return (ENOTTY);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
pflog_packet(struct pfi_kif *kif, 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, struct pf_pdesc *pd, int lookupsafe)
|
|
{
|
|
struct ifnet *ifn;
|
|
struct pfloghdr hdr;
|
|
|
|
if (kif == NULL || m == NULL || rm == NULL || pd == NULL)
|
|
return ( 1);
|
|
|
|
if ((ifn = pflogifs[rm->logif]) == NULL || !ifn->if_bpf)
|
|
return (0);
|
|
|
|
bzero(&hdr, sizeof(hdr));
|
|
hdr.length = PFLOG_REAL_HDRLEN;
|
|
hdr.af = af;
|
|
hdr.action = rm->action;
|
|
hdr.reason = reason;
|
|
memcpy(hdr.ifname, kif->pfik_name, sizeof(hdr.ifname));
|
|
|
|
if (am == NULL) {
|
|
hdr.rulenr = htonl(rm->nr);
|
|
hdr.subrulenr = 1;
|
|
} else {
|
|
hdr.rulenr = htonl(am->nr);
|
|
hdr.subrulenr = htonl(rm->nr);
|
|
if (ruleset != NULL && ruleset->anchor != NULL)
|
|
strlcpy(hdr.ruleset, ruleset->anchor->name,
|
|
sizeof(hdr.ruleset));
|
|
}
|
|
/*
|
|
* XXXGL: we avoid pf_socket_lookup() when we are holding
|
|
* state lock, since this leads to unsafe LOR.
|
|
* These conditions are very very rare, however.
|
|
*/
|
|
if (rm->log & PF_LOG_SOCKET_LOOKUP && !pd->lookup.done && lookupsafe)
|
|
pd->lookup.done = pf_socket_lookup(dir, pd, m);
|
|
if (pd->lookup.done > 0)
|
|
hdr.uid = pd->lookup.uid;
|
|
else
|
|
hdr.uid = UID_MAX;
|
|
hdr.pid = NO_PID;
|
|
hdr.rule_uid = rm->cuid;
|
|
hdr.rule_pid = rm->cpid;
|
|
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 */
|
|
|
|
ifn->if_opackets++;
|
|
ifn->if_obytes += m->m_pkthdr.len;
|
|
BPF_MTAP2(ifn, &hdr, PFLOG_HDRLEN, m);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
pflog_modevent(module_t mod, int type, void *data)
|
|
{
|
|
int error = 0;
|
|
|
|
switch (type) {
|
|
case MOD_LOAD:
|
|
pflogattach(1);
|
|
PF_RULES_WLOCK();
|
|
pflog_packet_ptr = pflog_packet;
|
|
PF_RULES_WUNLOCK();
|
|
break;
|
|
case MOD_UNLOAD:
|
|
PF_RULES_WLOCK();
|
|
pflog_packet_ptr = NULL;
|
|
PF_RULES_WUNLOCK();
|
|
if_clone_detach(pflog_cloner);
|
|
break;
|
|
default:
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
static moduledata_t pflog_mod = { pflogname, pflog_modevent, 0 };
|
|
|
|
#define PFLOG_MODVER 1
|
|
|
|
DECLARE_MODULE(pflog, pflog_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
|
|
MODULE_VERSION(pflog, PFLOG_MODVER);
|
|
MODULE_DEPEND(pflog, pf, PF_MODVER, PF_MODVER, PF_MODVER);
|