309 lines
6.8 KiB
C
309 lines
6.8 KiB
C
/* $NetBSD: if_pflog.c,v 1.18 2010/04/12 13:57:38 ahoka Exp $ */
|
|
/* $OpenBSD: if_pflog.c,v 1.24 2007/05/26 17:13:30 jason 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.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__KERNEL_RCSID(0, "$NetBSD: if_pflog.c,v 1.18 2010/04/12 13:57:38 ahoka Exp $");
|
|
|
|
#ifdef _KERNEL_OPT
|
|
#include "opt_inet.h"
|
|
#endif
|
|
|
|
#include "pflog.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/mbuf.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/ioctl.h>
|
|
|
|
#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 INET6
|
|
#ifndef INET
|
|
#include <netinet/in.h>
|
|
#endif
|
|
#include <netinet6/nd6.h>
|
|
#endif /* INET6 */
|
|
|
|
#include <net/pfvar.h>
|
|
#include <net/if_pflog.h>
|
|
|
|
#define PFLOGMTU (32768 + MHLEN + MLEN)
|
|
|
|
#ifdef PFLOGDEBUG
|
|
#define DPRINTF(x) do { if (pflogdebug) printf x ; } while (0)
|
|
#else
|
|
#define DPRINTF(x)
|
|
#endif
|
|
|
|
void pflogattach(int);
|
|
#ifdef _MODULE
|
|
void pflogdetach(void);
|
|
#endif /* _MODULE */
|
|
int pflogoutput(struct ifnet *, struct mbuf *, const struct sockaddr *,
|
|
struct rtentry *);
|
|
int pflogioctl(struct ifnet *, u_long, void *);
|
|
void pflogstart(struct ifnet *);
|
|
int pflog_clone_create(struct if_clone *, int);
|
|
int pflog_clone_destroy(struct ifnet *);
|
|
|
|
LIST_HEAD(, pflog_softc) pflogif_list;
|
|
struct if_clone pflog_cloner =
|
|
IF_CLONE_INITIALIZER("pflog", pflog_clone_create, pflog_clone_destroy);
|
|
|
|
struct ifnet *pflogifs[PFLOGIFS_MAX]; /* for fast access */
|
|
|
|
void
|
|
pflogattach(int npflog)
|
|
{
|
|
int i;
|
|
|
|
LIST_INIT(&pflogif_list);
|
|
for (i = 0; i < PFLOGIFS_MAX; i++)
|
|
pflogifs[i] = NULL;
|
|
if_clone_attach(&pflog_cloner);
|
|
}
|
|
|
|
#ifdef _MODULE
|
|
void
|
|
pflogdetach(void)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < PFLOGIFS_MAX; i++) {
|
|
if (pflogifs[i] != NULL)
|
|
pflog_clone_destroy(pflogifs[i]);
|
|
}
|
|
if_clone_detach(&pflog_cloner);
|
|
}
|
|
#endif /* _MODULE */
|
|
|
|
int
|
|
pflog_clone_create(struct if_clone *ifc, int unit)
|
|
{
|
|
struct ifnet *ifp;
|
|
struct pflog_softc *pflogif;
|
|
int s;
|
|
|
|
if (unit >= PFLOGIFS_MAX)
|
|
return (EINVAL);
|
|
|
|
if ((pflogif = malloc(sizeof(*pflogif), M_DEVBUF, M_NOWAIT|M_ZERO)) == NULL)
|
|
return (ENOMEM);
|
|
|
|
pflogif->sc_unit = unit;
|
|
ifp = &pflogif->sc_if;
|
|
snprintf(ifp->if_xname, sizeof ifp->if_xname, "pflog%d", unit);
|
|
ifp->if_softc = pflogif;
|
|
ifp->if_mtu = PFLOGMTU;
|
|
ifp->if_ioctl = pflogioctl;
|
|
ifp->if_output = pflogoutput;
|
|
ifp->if_start = pflogstart;
|
|
ifp->if_type = IFT_PFLOG;
|
|
#ifndef __NetBSD__
|
|
ifp->if_snd.ifq_maxlen = ifqmaxlen;
|
|
#endif /* !__NetBSD__ */
|
|
ifp->if_hdrlen = PFLOG_HDRLEN;
|
|
if_attach(ifp);
|
|
if_alloc_sadl(ifp);
|
|
|
|
#ifdef __NetBSD__
|
|
bpf_attach(ifp, DLT_PFLOG, PFLOG_HDRLEN);
|
|
#else
|
|
bpfattach(&pflogif->sc_if.if_bpf, ifp, DLT_PFLOG, PFLOG_HDRLEN);
|
|
#endif /* !__NetBSD__ */
|
|
|
|
s = splnet();
|
|
LIST_INSERT_HEAD(&pflogif_list, pflogif, sc_list);
|
|
pflogifs[unit] = ifp;
|
|
splx(s);
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
pflog_clone_destroy(struct ifnet *ifp)
|
|
{
|
|
struct pflog_softc *pflogif = ifp->if_softc;
|
|
int s;
|
|
|
|
s = splnet();
|
|
pflogifs[pflogif->sc_unit] = NULL;
|
|
LIST_REMOVE(pflogif, sc_list);
|
|
splx(s);
|
|
|
|
bpf_detach(ifp);
|
|
if_detach(ifp);
|
|
free(pflogif, M_DEVBUF);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Start output on the pflog interface.
|
|
*/
|
|
void
|
|
pflogstart(struct ifnet *ifp)
|
|
{
|
|
struct mbuf *m;
|
|
int s;
|
|
|
|
for (;;) {
|
|
s = splnet();
|
|
IF_DROP(&ifp->if_snd);
|
|
IF_DEQUEUE(&ifp->if_snd, m);
|
|
splx(s);
|
|
|
|
if (m == NULL)
|
|
return;
|
|
else
|
|
m_freem(m);
|
|
}
|
|
}
|
|
|
|
int
|
|
pflogoutput(struct ifnet *ifp, struct mbuf *m,
|
|
const struct sockaddr *dst, struct rtentry *rt)
|
|
{
|
|
m_freem(m);
|
|
return (0);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
int
|
|
pflogioctl(struct ifnet *ifp, u_long cmd, void *data)
|
|
{
|
|
int error = 0;
|
|
|
|
switch (cmd) {
|
|
case SIOCSIFFLAGS:
|
|
if ((error = ifioctl_common(ifp, cmd, data)) != 0)
|
|
break;
|
|
/*FALLTHROUGH*/
|
|
case SIOCINITIFADDR:
|
|
case SIOCAIFADDR:
|
|
case SIOCSIFDSTADDR:
|
|
if (ifp->if_flags & IFF_UP)
|
|
ifp->if_flags |= IFF_RUNNING;
|
|
else
|
|
ifp->if_flags &= ~IFF_RUNNING;
|
|
break;
|
|
default:
|
|
error = ifioctl_common(ifp, cmd, data);
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
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)
|
|
{
|
|
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));
|
|
}
|
|
if (rm->log & PF_LOG_SOCKET_LOOKUP && !pd->lookup.done)
|
|
pd->lookup.done = pf_socket_lookup(dir, pd);
|
|
if (pd->lookup.done > 0) {
|
|
hdr.uid = pd->lookup.uid;
|
|
hdr.pid = pd->lookup.pid;
|
|
} 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;
|
|
|
|
#ifdef __NetBSD__
|
|
bpf_mtap2(ifn->if_bpf, &hdr, PFLOG_HDRLEN, m);
|
|
#else
|
|
bpf_mtap_hdr(ifn->if_bpf, (char *)&hdr, PFLOG_HDRLEN, m,
|
|
BPF_DIRECTION_OUT);
|
|
#endif /* !__NetBSD__ */
|
|
|
|
|
|
return (0);
|
|
}
|