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/* $OpenBSD: if_pflog.c,v 1.18 2006/06/28 12:04:31 claudio 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 "bpfilter.h"
#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
struct pflog_softc pflogif[NPFLOG];
void pflogattach(int);
int pflogoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
struct rtentry *);
int pflogioctl(struct ifnet *, u_long, caddr_t);
void pflogstart(struct ifnet *);
extern int ifqmaxlen;
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
}
}
/*
* 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, struct sockaddr *dst,
struct rtentry *rt)
{
m_freem(m);
return (0);
}
/* 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 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)
{
#if NBPFILTER > 0
struct ifnet *ifn;
struct pfloghdr hdr;
if (kif == NULL || m == NULL || rm == NULL || pd == NULL)
return (-1);
ifn = &(pflogif[0].sc_if);
if (!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 */
bpf_mtap_hdr(ifn->if_bpf, (char *)&hdr, PFLOG_HDRLEN, m,
BPF_DIRECTION_OUT);
#endif
return (0);
}
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