392 lines
8.3 KiB
C
392 lines
8.3 KiB
C
/* $FreeBSD$ */
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/* $OpenBSD: if_pflog.c,v 1.9 2003/05/14 08:42:00 canacar Exp $ */
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/*
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* The authors of this code are John Ioannidis (ji@tla.org),
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* Angelos D. Keromytis (kermit@csd.uch.gr) and
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* Niels Provos (provos@physnet.uni-hamburg.de).
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*
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* This code was written by John Ioannidis for BSD/OS in Athens, Greece,
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* in November 1995.
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*
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* Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
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* by Angelos D. Keromytis.
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*
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* Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
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* and Niels Provos.
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*
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* Copyright (C) 1995, 1996, 1997, 1998 by John Ioannidis, Angelos D. Keromytis
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* and Niels Provos.
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* Copyright (c) 2001, Angelos D. Keromytis, Niels Provos.
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*
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* Permission to use, copy, and modify this software with or without fee
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* is hereby granted, provided that this entire notice is included in
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* all copies of any software which is or includes a copy or
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* modification of this software.
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* You may use this code under the GNU public license if you so wish. Please
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* contribute changes back to the authors under this freer than GPL license
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* so that we may further the use of strong encryption without limitations to
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* all.
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*
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* THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
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* REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
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* MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
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* PURPOSE.
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*/
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#ifdef __FreeBSD__
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#include "opt_inet.h"
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#include "opt_inet6.h"
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#endif
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#ifndef __FreeBSD__
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#include "bpfilter.h"
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#include "pflog.h"
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#elif __FreeBSD__ >= 5
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#include "opt_bpf.h"
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#include "opt_pf.h"
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#define NBPFILTER DEV_BPF
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#define NPFLOG DEV_PFLOG
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#endif
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#ifdef __FreeBSD__
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/sockio.h>
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#else
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#include <sys/ioctl.h>
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#endif
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#include <net/if.h>
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#include <net/if_types.h>
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#include <net/route.h>
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#include <net/bpf.h>
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#ifdef INET
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#include <netinet/in.h>
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#include <netinet/in_var.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#endif
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#ifdef __FreeBSD__
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#include <machine/in_cksum.h>
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#endif
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#ifdef INET6
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#ifndef INET
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#include <netinet/in.h>
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#endif
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#include <netinet6/nd6.h>
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#endif /* INET6 */
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#include <net/pfvar.h>
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#include <net/if_pflog.h>
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#ifdef __FreeBSD__
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#define PFLOGNAME "pflog"
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#endif
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#define PFLOGMTU (32768 + MHLEN + MLEN)
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#ifdef PFLOGDEBUG
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#define DPRINTF(x) do { if (pflogdebug) printf x ; } while (0)
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#else
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#define DPRINTF(x)
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#endif
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#ifndef __FreeBSD__
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struct pflog_softc pflogif[NPFLOG];
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#endif
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#ifdef __FreeBSD__
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static void pflog_clone_destroy(struct ifnet *);
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static int pflog_clone_create(struct if_clone *, int);
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#else
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void pflogattach(int);
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#endif
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int pflogoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
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struct rtentry *);
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int pflogioctl(struct ifnet *, u_long, caddr_t);
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void pflogrtrequest(int, struct rtentry *, struct sockaddr *);
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void pflogstart(struct ifnet *);
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#ifndef __FreeBSD__
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extern int ifqmaxlen;
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#endif
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#ifdef __FreeBSD__
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static MALLOC_DEFINE(M_PFLOG, PFLOGNAME, "Packet Filter Logging Interface");
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static LIST_HEAD(pflog_list, pflog_softc) pflog_list;
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struct if_clone pflog_cloner = IF_CLONE_INITIALIZER(PFLOGNAME,
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pflog_clone_create, pflog_clone_destroy, 1, IF_MAXUNIT);
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static void
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pflog_clone_destroy(struct ifnet *ifp)
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{
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struct pflog_softc *sc;
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sc = ifp->if_softc;
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/*
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* Does we really need this?
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*/
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IF_DRAIN(&ifp->if_snd);
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bpfdetach(ifp);
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if_detach(ifp);
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LIST_REMOVE(sc, sc_next);
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free(sc, M_PFLOG);
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}
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static int
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pflog_clone_create(struct if_clone *ifc, int unit)
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{
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struct pflog_softc *sc;
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MALLOC(sc, struct pflog_softc *, sizeof(*sc), M_PFLOG, M_WAITOK|M_ZERO);
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#if (__FreeBSD_version < 501113)
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sc->sc_if.if_name = PFLOGNAME;
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sc->sc_if.if_unit = unit;
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#else
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if_initname(&sc->sc_if, ifc->ifc_name, unit);
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#endif
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sc->sc_if.if_mtu = PFLOGMTU;
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sc->sc_if.if_ioctl = pflogioctl;
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sc->sc_if.if_output = pflogoutput;
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sc->sc_if.if_start = pflogstart;
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sc->sc_if.if_type = IFT_PFLOG;
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sc->sc_if.if_snd.ifq_maxlen = ifqmaxlen;
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sc->sc_if.if_hdrlen = PFLOG_HDRLEN;
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sc->sc_if.if_softc = sc;
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/*
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* We would get a message like
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* "in6_ifattach: pflog0 is not multicast capable, IPv6 not enabled".
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* We need a patch to in6_ifattach() to exclude interface type
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* IFT_PFLOG.
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*/
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if_attach(&sc->sc_if);
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LIST_INSERT_HEAD(&pflog_list, sc, sc_next);
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#if NBPFILTER > 0
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bpfattach(&sc->sc_if, DLT_PFLOG, PFLOG_HDRLEN);
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#endif
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return (0);
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}
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#else /* !__FreeBSD__ */
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void
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pflogattach(int npflog)
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{
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struct ifnet *ifp;
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int i;
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bzero(pflogif, sizeof(pflogif));
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for (i = 0; i < NPFLOG; i++) {
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ifp = &pflogif[i].sc_if;
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snprintf(ifp->if_xname, sizeof ifp->if_xname, "pflog%d", i);
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ifp->if_softc = &pflogif[i];
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ifp->if_mtu = PFLOGMTU;
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ifp->if_ioctl = pflogioctl;
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ifp->if_output = pflogoutput;
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ifp->if_start = pflogstart;
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ifp->if_type = IFT_PFLOG;
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ifp->if_snd.ifq_maxlen = ifqmaxlen;
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ifp->if_hdrlen = PFLOG_HDRLEN;
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if_attach(ifp);
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if_alloc_sadl(ifp);
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#if NBPFILTER > 0
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bpfattach(&pflogif[i].sc_if.if_bpf, ifp, DLT_PFLOG,
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PFLOG_HDRLEN);
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#endif
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}
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}
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#endif /* __FreeBSD__ */
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/*
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* Start output on the pflog interface.
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*/
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void
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pflogstart(struct ifnet *ifp)
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{
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struct mbuf *m;
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#if defined(__FreeBSD__) && defined(ALTQ)
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struct ifaltq *ifq;
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#else
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struct ifqueue *ifq;
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#endif
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int s;
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#ifdef __FreeBSD__
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ifq = &ifp->if_snd;
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#endif
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for (;;) {
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s = splimp();
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#ifdef __FreeBSD__
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IF_LOCK(ifq);
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_IF_DROP(ifq);
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_IF_DEQUEUE(ifq, m);
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IF_UNLOCK(ifq);
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#else
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IF_DROP(&ifp->if_snd);
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IF_DEQUEUE(&ifp->if_snd, m);
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#endif
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splx(s);
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if (m == NULL)
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return;
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else
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m_freem(m);
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}
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}
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int
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pflogoutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
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struct rtentry *rt)
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{
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m_freem(m);
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return (0);
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}
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/* ARGSUSED */
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void
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pflogrtrequest(int cmd, struct rtentry *rt, struct sockaddr *sa)
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{
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if (rt)
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rt->rt_rmx.rmx_mtu = PFLOGMTU;
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}
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/* ARGSUSED */
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int
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pflogioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
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{
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switch (cmd) {
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case SIOCSIFADDR:
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case SIOCAIFADDR:
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case SIOCSIFDSTADDR:
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case SIOCSIFFLAGS:
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if (ifp->if_flags & IFF_UP)
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ifp->if_flags |= IFF_RUNNING;
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else
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ifp->if_flags &= ~IFF_RUNNING;
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break;
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default:
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return (EINVAL);
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}
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return (0);
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}
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int
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pflog_packet(struct ifnet *ifp, struct mbuf *m, sa_family_t af, u_int8_t dir,
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u_int8_t reason, struct pf_rule *rm, struct pf_rule *am,
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struct pf_ruleset *ruleset)
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{
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#if NBPFILTER > 0
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struct ifnet *ifn;
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struct pfloghdr hdr;
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struct mbuf m1;
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if (ifp == NULL || m == NULL || rm == NULL)
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return (-1);
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hdr.length = PFLOG_REAL_HDRLEN;
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hdr.af = af;
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hdr.action = rm->action;
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hdr.reason = reason;
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#if defined(__FreeBSD__) && (__FreeBSD_version < 501113)
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snprintf(hdr.ifname, IFNAMSIZ, "%s%d", ifp->if_name, ifp->if_unit);
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#else
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memcpy(hdr.ifname, ifp->if_xname, sizeof(hdr.ifname));
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#endif
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if (am == NULL) {
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hdr.rulenr = htonl(rm->nr);
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hdr.subrulenr = -1;
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bzero(hdr.ruleset, sizeof(hdr.ruleset));
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} else {
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hdr.rulenr = htonl(am->nr);
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hdr.subrulenr = htonl(rm->nr);
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if (ruleset == NULL)
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bzero(hdr.ruleset, sizeof(hdr.ruleset));
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else
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memcpy(hdr.ruleset, ruleset->name,
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sizeof(hdr.ruleset));
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}
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hdr.dir = dir;
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#ifdef INET
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if (af == AF_INET && dir == PF_OUT) {
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struct ip *ip;
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ip = mtod(m, struct ip *);
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ip->ip_sum = 0;
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ip->ip_sum = in_cksum(m, ip->ip_hl << 2);
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}
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#endif /* INET */
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m1.m_next = m;
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m1.m_len = PFLOG_HDRLEN;
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m1.m_data = (char *) &hdr;
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#ifdef __FreeBSD__
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KASSERT((!LIST_EMPTY(&pflog_list)), ("pflog: no interface"));
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ifn = &LIST_FIRST(&pflog_list)->sc_if;
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#else
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ifn = &(pflogif[0].sc_if);
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#endif
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if (ifn->if_bpf)
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bpf_mtap(ifn->if_bpf, &m1);
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#endif
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return (0);
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}
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#ifdef __FreeBSD__
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static int
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pflog_modevent(module_t mod, int type, void *data)
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{
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int error = 0;
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switch (type) {
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case MOD_LOAD:
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LIST_INIT(&pflog_list);
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if_clone_attach(&pflog_cloner);
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break;
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case MOD_UNLOAD:
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if_clone_detach(&pflog_cloner);
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while (!LIST_EMPTY(&pflog_list))
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pflog_clone_destroy(
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&LIST_FIRST(&pflog_list)->sc_if);
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break;
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default:
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error = EINVAL;
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break;
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}
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return error;
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}
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static moduledata_t pflog_mod = {
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"pflog",
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pflog_modevent,
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0
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};
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#define PFLOG_MODVER 1
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DECLARE_MODULE(pflog, pflog_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
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MODULE_VERSION(pflog, PFLOG_MODVER);
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#endif /* __FreeBSD__ */
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