1878 lines
44 KiB
C
1878 lines
44 KiB
C
/* $FreeBSD$ */
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/* $OpenBSD: if_pfsync.c,v 1.46 2005/02/20 15:58:38 mcbride Exp $ */
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/*
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* Copyright (c) 2002 Michael Shalayeff
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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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 "pfsync.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 NPFSYNC DEV_PFSYNC
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#endif
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#include <sys/param.h>
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#include <sys/proc.h>
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#include <sys/systm.h>
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#include <sys/time.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/kernel.h>
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#ifdef __FreeBSD__
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#include <sys/endian.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/sockio.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/sysctl.h>
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#else
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#include <sys/ioctl.h>
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#include <sys/timeout.h>
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#endif
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#include <net/if.h>
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#if defined(__FreeBSD__)
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#include <net/if_clone.h>
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#endif
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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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#include <netinet/tcp.h>
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#include <netinet/tcp_seq.h>
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#ifdef INET
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/in_var.h>
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#include <netinet/ip.h>
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#include <netinet/ip_var.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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#ifdef __FreeBSD__
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#include "opt_carp.h"
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#ifdef DEV_CARP
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#define NCARP 1
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#endif
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#else
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#include "carp.h"
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#endif
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#if NCARP > 0
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extern int carp_suppress_preempt;
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#endif
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#include <net/pfvar.h>
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#include <net/if_pfsync.h>
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#ifdef __FreeBSD__
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#define PFSYNCNAME "pfsync"
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#endif
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#define PFSYNC_MINMTU \
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(sizeof(struct pfsync_header) + sizeof(struct pf_state))
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#ifdef PFSYNCDEBUG
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#define DPRINTF(x) do { if (pfsyncdebug) printf x ; } while (0)
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int pfsyncdebug;
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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 pfsync_softc pfsyncif;
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#endif
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struct pfsyncstats pfsyncstats;
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#ifdef __FreeBSD__
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SYSCTL_DECL(_net_inet_pfsync);
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SYSCTL_STRUCT(_net_inet_pfsync, 0, stats, CTLFLAG_RW,
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&pfsyncstats, pfsyncstats,
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"PFSYNC statistics (struct pfsyncstats, net/if_pfsync.h)");
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/*
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* Locking notes:
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* Whenever we really touch/look at the state table we have to hold the
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* PF_LOCK. Functions that do just the interface handling, grab the per
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* softc lock instead.
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*
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*/
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static void pfsync_clone_destroy(struct ifnet *);
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static int pfsync_clone_create(struct if_clone *, int);
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static void pfsync_senddef(void *);
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#else
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void pfsyncattach(int);
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#endif
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void pfsync_setmtu(struct pfsync_softc *, int);
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int pfsync_insert_net_state(struct pfsync_state *);
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int pfsyncoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
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struct rtentry *);
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int pfsyncioctl(struct ifnet *, u_long, caddr_t);
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void pfsyncstart(struct ifnet *);
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struct mbuf *pfsync_get_mbuf(struct pfsync_softc *, u_int8_t, void **);
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int pfsync_request_update(struct pfsync_state_upd *, struct in_addr *);
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int pfsync_sendout(struct pfsync_softc *);
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void pfsync_timeout(void *);
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void pfsync_send_bus(struct pfsync_softc *, u_int8_t);
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void pfsync_bulk_update(void *);
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void pfsync_bulkfail(void *);
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int pfsync_sync_ok;
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#ifndef __FreeBSD__
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extern int ifqmaxlen;
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extern struct timeval time;
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extern struct timeval mono_time;
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extern int hz;
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#endif
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#ifdef __FreeBSD__
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static MALLOC_DEFINE(M_PFSYNC, PFSYNCNAME, "Packet Filter State Sync. Interface");
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static LIST_HEAD(pfsync_list, pfsync_softc) pfsync_list;
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#define SCP2IFP(sc) ((sc)->sc_ifp)
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IFC_SIMPLE_DECLARE(pfsync, 1);
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static void
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pfsync_clone_destroy(struct ifnet *ifp)
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{
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struct pfsync_softc *sc;
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sc = ifp->if_softc;
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callout_stop(&sc->sc_tmo);
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callout_stop(&sc->sc_bulk_tmo);
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callout_stop(&sc->sc_bulkfail_tmo);
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callout_stop(&sc->sc_send_tmo);
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#if NBPFILTER > 0
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bpfdetach(ifp);
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#endif
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if_detach(ifp);
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if_free(ifp);
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LIST_REMOVE(sc, sc_next);
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free(sc, M_PFSYNC);
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}
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static int
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pfsync_clone_create(struct if_clone *ifc, int unit)
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{
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struct pfsync_softc *sc;
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struct ifnet *ifp;
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MALLOC(sc, struct pfsync_softc *, sizeof(*sc), M_PFSYNC,
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M_WAITOK|M_ZERO);
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ifp = sc->sc_ifp = if_alloc(IFT_PFSYNC);
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if (ifp == NULL) {
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free(sc, M_PFSYNC);
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return (ENOSPC);
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}
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pfsync_sync_ok = 1;
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sc->sc_mbuf = NULL;
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sc->sc_mbuf_net = NULL;
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sc->sc_statep.s = NULL;
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sc->sc_statep_net.s = NULL;
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sc->sc_maxupdates = 128;
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sc->sc_sendaddr.s_addr = htonl(INADDR_PFSYNC_GROUP);
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sc->sc_ureq_received = 0;
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sc->sc_ureq_sent = 0;
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ifp = SCP2IFP(sc);
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if_initname(ifp, ifc->ifc_name, unit);
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ifp->if_ioctl = pfsyncioctl;
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ifp->if_output = pfsyncoutput;
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ifp->if_start = pfsyncstart;
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ifp->if_snd.ifq_maxlen = ifqmaxlen;
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ifp->if_hdrlen = PFSYNC_HDRLEN;
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ifp->if_baudrate = IF_Mbps(100);
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ifp->if_softc = sc;
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pfsync_setmtu(sc, MCLBYTES);
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callout_init(&sc->sc_tmo, NET_CALLOUT_MPSAFE);
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callout_init(&sc->sc_bulk_tmo, NET_CALLOUT_MPSAFE);
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callout_init(&sc->sc_bulkfail_tmo, NET_CALLOUT_MPSAFE);
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callout_init(&sc->sc_send_tmo, NET_CALLOUT_MPSAFE);
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sc->sc_ifq.ifq_maxlen = ifqmaxlen;
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mtx_init(&sc->sc_ifq.ifq_mtx, ifp->if_xname, "pfsync send queue",
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MTX_DEF);
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if_attach(ifp);
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LIST_INSERT_HEAD(&pfsync_list, sc, sc_next);
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#if NBPFILTER > 0
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bpfattach(ifp, DLT_PFSYNC, PFSYNC_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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pfsyncattach(int npfsync)
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{
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struct ifnet *ifp;
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pfsync_sync_ok = 1;
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bzero(&pfsyncif, sizeof(pfsyncif));
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pfsyncif.sc_mbuf = NULL;
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pfsyncif.sc_mbuf_net = NULL;
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pfsyncif.sc_statep.s = NULL;
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pfsyncif.sc_statep_net.s = NULL;
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pfsyncif.sc_maxupdates = 128;
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pfsyncif.sc_sync_peer.s_addr = INADDR_PFSYNC_GROUP;
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pfsyncif.sc_sendaddr.s_addr = INADDR_PFSYNC_GROUP;
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pfsyncif.sc_ureq_received = 0;
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pfsyncif.sc_ureq_sent = 0;
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ifp = &pfsyncif.sc_if;
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strlcpy(ifp->if_xname, "pfsync0", sizeof ifp->if_xname);
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ifp->if_softc = &pfsyncif;
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ifp->if_ioctl = pfsyncioctl;
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ifp->if_output = pfsyncoutput;
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ifp->if_start = pfsyncstart;
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ifp->if_type = IFT_PFSYNC;
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ifp->if_snd.ifq_maxlen = ifqmaxlen;
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ifp->if_hdrlen = PFSYNC_HDRLEN;
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pfsync_setmtu(&pfsyncif, MCLBYTES);
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timeout_set(&pfsyncif.sc_tmo, pfsync_timeout, &pfsyncif);
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timeout_set(&pfsyncif.sc_bulk_tmo, pfsync_bulk_update, &pfsyncif);
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timeout_set(&pfsyncif.sc_bulkfail_tmo, pfsync_bulkfail, &pfsyncif);
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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(&pfsyncif.sc_if.if_bpf, ifp, DLT_PFSYNC, PFSYNC_HDRLEN);
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#endif
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}
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#endif
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/*
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* Start output on the pfsync interface.
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*/
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void
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pfsyncstart(struct ifnet *ifp)
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{
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#ifdef __FreeBSD__
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IF_LOCK(&ifp->if_snd);
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_IF_DROP(&ifp->if_snd);
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_IF_DRAIN(&ifp->if_snd);
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IF_UNLOCK(&ifp->if_snd);
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#else
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struct mbuf *m;
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int s;
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for (;;) {
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s = splimp();
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IF_DROP(&ifp->if_snd);
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IF_DEQUEUE(&ifp->if_snd, m);
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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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#endif
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}
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int
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pfsync_insert_net_state(struct pfsync_state *sp)
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{
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struct pf_state *st = NULL;
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struct pf_rule *r = NULL;
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struct pfi_kif *kif;
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#ifdef __FreeBSD__
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PF_ASSERT(MA_OWNED);
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#endif
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if (sp->creatorid == 0 && pf_status.debug >= PF_DEBUG_MISC) {
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printf("pfsync_insert_net_state: invalid creator id:"
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" %08x\n", ntohl(sp->creatorid));
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return (EINVAL);
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}
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kif = pfi_lookup_create(sp->ifname);
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if (kif == NULL) {
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if (pf_status.debug >= PF_DEBUG_MISC)
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printf("pfsync_insert_net_state: "
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"unknown interface: %s\n", sp->ifname);
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/* skip this state */
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return (0);
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}
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/*
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* Just use the default rule until we have infrastructure to find the
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* best matching rule.
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*/
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r = &pf_default_rule;
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if (!r->max_states || r->states < r->max_states)
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st = pool_get(&pf_state_pl, PR_NOWAIT);
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if (st == NULL) {
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pfi_maybe_destroy(kif);
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return (ENOMEM);
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}
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bzero(st, sizeof(*st));
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st->rule.ptr = r;
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/* XXX get pointers to nat_rule and anchor */
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/* XXX when we have nat_rule/anchors, use STATE_INC_COUNTERS */
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r->states++;
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/* fill in the rest of the state entry */
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pf_state_host_ntoh(&sp->lan, &st->lan);
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pf_state_host_ntoh(&sp->gwy, &st->gwy);
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pf_state_host_ntoh(&sp->ext, &st->ext);
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pf_state_peer_ntoh(&sp->src, &st->src);
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pf_state_peer_ntoh(&sp->dst, &st->dst);
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bcopy(&sp->rt_addr, &st->rt_addr, sizeof(st->rt_addr));
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st->creation = time_second - ntohl(sp->creation);
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st->expire = ntohl(sp->expire) + time_second;
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st->af = sp->af;
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st->proto = sp->proto;
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st->direction = sp->direction;
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st->log = sp->log;
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st->timeout = sp->timeout;
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st->allow_opts = sp->allow_opts;
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bcopy(sp->id, &st->id, sizeof(st->id));
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st->creatorid = sp->creatorid;
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st->sync_flags = PFSTATE_FROMSYNC;
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if (pf_insert_state(kif, st)) {
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pfi_maybe_destroy(kif);
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/* XXX when we have nat_rule/anchors, use STATE_DEC_COUNTERS */
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r->states--;
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pool_put(&pf_state_pl, st);
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return (EINVAL);
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}
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return (0);
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}
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void
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#ifdef __FreeBSD__
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pfsync_input(struct mbuf *m, __unused int off)
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#else
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pfsync_input(struct mbuf *m, ...)
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#endif
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{
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struct ip *ip = mtod(m, struct ip *);
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struct pfsync_header *ph;
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#ifdef __FreeBSD__
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struct pfsync_softc *sc = LIST_FIRST(&pfsync_list);
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#else
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struct pfsync_softc *sc = &pfsyncif;
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#endif
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struct pf_state *st, key;
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struct pfsync_state *sp;
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struct pfsync_state_upd *up;
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struct pfsync_state_del *dp;
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struct pfsync_state_clr *cp;
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struct pfsync_state_upd_req *rup;
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struct pfsync_state_bus *bus;
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struct in_addr src;
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struct mbuf *mp;
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int iplen, action, error, i, s, count, offp, sfail, stale = 0;
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pfsyncstats.pfsyncs_ipackets++;
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|
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/* verify that we have a sync interface configured */
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if (!sc->sc_sync_ifp || !pf_status.running) /* XXX PF_LOCK? */
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goto done;
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|
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/* verify that the packet came in on the right interface */
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if (sc->sc_sync_ifp != m->m_pkthdr.rcvif) {
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pfsyncstats.pfsyncs_badif++;
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goto done;
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}
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|
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/* verify that the IP TTL is 255. */
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if (ip->ip_ttl != PFSYNC_DFLTTL) {
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pfsyncstats.pfsyncs_badttl++;
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goto done;
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}
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iplen = ip->ip_hl << 2;
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if (m->m_pkthdr.len < iplen + sizeof(*ph)) {
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pfsyncstats.pfsyncs_hdrops++;
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goto done;
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}
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if (iplen + sizeof(*ph) > m->m_len) {
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if ((m = m_pullup(m, iplen + sizeof(*ph))) == NULL) {
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pfsyncstats.pfsyncs_hdrops++;
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goto done;
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}
|
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ip = mtod(m, struct ip *);
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}
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ph = (struct pfsync_header *)((char *)ip + iplen);
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|
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/* verify the version */
|
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if (ph->version != PFSYNC_VERSION) {
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pfsyncstats.pfsyncs_badver++;
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goto done;
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}
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action = ph->action;
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count = ph->count;
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/* make sure it's a valid action code */
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if (action >= PFSYNC_ACT_MAX) {
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pfsyncstats.pfsyncs_badact++;
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goto done;
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}
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|
|
/* Cheaper to grab this now than having to mess with mbufs later */
|
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src = ip->ip_src;
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switch (action) {
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case PFSYNC_ACT_CLR: {
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struct pf_state *nexts;
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struct pfi_kif *kif;
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u_int32_t creatorid;
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if ((mp = m_pulldown(m, iplen + sizeof(*ph),
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sizeof(*cp), &offp)) == NULL) {
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pfsyncstats.pfsyncs_badlen++;
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return;
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}
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cp = (struct pfsync_state_clr *)(mp->m_data + offp);
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creatorid = cp->creatorid;
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s = splsoftnet();
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#ifdef __FreeBSD__
|
|
PF_LOCK();
|
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#endif
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if (cp->ifname[0] == '\0') {
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for (st = RB_MIN(pf_state_tree_id, &tree_id);
|
|
st; st = nexts) {
|
|
nexts = RB_NEXT(pf_state_tree_id, &tree_id, st);
|
|
if (st->creatorid == creatorid) {
|
|
st->timeout = PFTM_PURGE;
|
|
pf_purge_expired_state(st);
|
|
}
|
|
}
|
|
} else {
|
|
kif = pfi_lookup_if(cp->ifname);
|
|
if (kif == NULL) {
|
|
if (pf_status.debug >= PF_DEBUG_MISC)
|
|
printf("pfsync_input: PFSYNC_ACT_CLR "
|
|
"bad interface: %s\n", cp->ifname);
|
|
splx(s);
|
|
#ifdef __FreeBSD__
|
|
PF_UNLOCK();
|
|
#endif
|
|
goto done;
|
|
}
|
|
for (st = RB_MIN(pf_state_tree_lan_ext,
|
|
&kif->pfik_lan_ext); st; st = nexts) {
|
|
nexts = RB_NEXT(pf_state_tree_lan_ext,
|
|
&kif->pfik_lan_ext, st);
|
|
if (st->creatorid == creatorid) {
|
|
st->timeout = PFTM_PURGE;
|
|
pf_purge_expired_state(st);
|
|
}
|
|
}
|
|
}
|
|
#ifdef __FreeBSD__
|
|
PF_UNLOCK();
|
|
#endif
|
|
splx(s);
|
|
|
|
break;
|
|
}
|
|
case PFSYNC_ACT_INS:
|
|
if ((mp = m_pulldown(m, iplen + sizeof(*ph),
|
|
count * sizeof(*sp), &offp)) == NULL) {
|
|
pfsyncstats.pfsyncs_badlen++;
|
|
return;
|
|
}
|
|
|
|
s = splsoftnet();
|
|
#ifdef __FreeBSD__
|
|
PF_LOCK();
|
|
#endif
|
|
for (i = 0, sp = (struct pfsync_state *)(mp->m_data + offp);
|
|
i < count; i++, sp++) {
|
|
/* check for invalid values */
|
|
if (sp->timeout >= PFTM_MAX ||
|
|
sp->src.state > PF_TCPS_PROXY_DST ||
|
|
sp->dst.state > PF_TCPS_PROXY_DST ||
|
|
sp->direction > PF_OUT ||
|
|
(sp->af != AF_INET && sp->af != AF_INET6)) {
|
|
if (pf_status.debug >= PF_DEBUG_MISC)
|
|
printf("pfsync_insert: PFSYNC_ACT_INS: "
|
|
"invalid value\n");
|
|
pfsyncstats.pfsyncs_badstate++;
|
|
continue;
|
|
}
|
|
|
|
if ((error = pfsync_insert_net_state(sp))) {
|
|
if (error == ENOMEM) {
|
|
splx(s);
|
|
#ifdef __FreeBSD__
|
|
PF_UNLOCK();
|
|
#endif
|
|
goto done;
|
|
}
|
|
continue;
|
|
}
|
|
}
|
|
#ifdef __FreeBSD__
|
|
PF_UNLOCK();
|
|
#endif
|
|
splx(s);
|
|
break;
|
|
case PFSYNC_ACT_UPD:
|
|
if ((mp = m_pulldown(m, iplen + sizeof(*ph),
|
|
count * sizeof(*sp), &offp)) == NULL) {
|
|
pfsyncstats.pfsyncs_badlen++;
|
|
return;
|
|
}
|
|
|
|
s = splsoftnet();
|
|
#ifdef __FreeBSD__
|
|
PF_LOCK();
|
|
#endif
|
|
for (i = 0, sp = (struct pfsync_state *)(mp->m_data + offp);
|
|
i < count; i++, sp++) {
|
|
int flags = PFSYNC_FLAG_STALE;
|
|
|
|
/* check for invalid values */
|
|
if (sp->timeout >= PFTM_MAX ||
|
|
sp->src.state > PF_TCPS_PROXY_DST ||
|
|
sp->dst.state > PF_TCPS_PROXY_DST) {
|
|
if (pf_status.debug >= PF_DEBUG_MISC)
|
|
printf("pfsync_insert: PFSYNC_ACT_UPD: "
|
|
"invalid value\n");
|
|
pfsyncstats.pfsyncs_badstate++;
|
|
continue;
|
|
}
|
|
|
|
bcopy(sp->id, &key.id, sizeof(key.id));
|
|
key.creatorid = sp->creatorid;
|
|
|
|
st = pf_find_state_byid(&key);
|
|
if (st == NULL) {
|
|
/* insert the update */
|
|
if (pfsync_insert_net_state(sp))
|
|
pfsyncstats.pfsyncs_badstate++;
|
|
continue;
|
|
}
|
|
sfail = 0;
|
|
if (st->proto == IPPROTO_TCP) {
|
|
/*
|
|
* The state should never go backwards except
|
|
* for syn-proxy states. Neither should the
|
|
* sequence window slide backwards.
|
|
*/
|
|
if (st->src.state > sp->src.state &&
|
|
(st->src.state < PF_TCPS_PROXY_SRC ||
|
|
sp->src.state >= PF_TCPS_PROXY_SRC))
|
|
sfail = 1;
|
|
else if (SEQ_GT(st->src.seqlo,
|
|
ntohl(sp->src.seqlo)))
|
|
sfail = 3;
|
|
else if (st->dst.state > sp->dst.state) {
|
|
/* There might still be useful
|
|
* information about the src state here,
|
|
* so import that part of the update,
|
|
* then "fail" so we send the updated
|
|
* state back to the peer who is missing
|
|
* our what we know. */
|
|
pf_state_peer_ntoh(&sp->src, &st->src);
|
|
/* XXX do anything with timeouts? */
|
|
sfail = 7;
|
|
flags = 0;
|
|
} else if (st->dst.state >= TCPS_SYN_SENT &&
|
|
SEQ_GT(st->dst.seqlo, ntohl(sp->dst.seqlo)))
|
|
sfail = 4;
|
|
} else {
|
|
/*
|
|
* Non-TCP protocol state machine always go
|
|
* forwards
|
|
*/
|
|
if (st->src.state > sp->src.state)
|
|
sfail = 5;
|
|
else if ( st->dst.state > sp->dst.state)
|
|
sfail = 6;
|
|
}
|
|
if (sfail) {
|
|
if (pf_status.debug >= PF_DEBUG_MISC)
|
|
printf("pfsync: %s stale update "
|
|
"(%d) id: %016llx "
|
|
"creatorid: %08x\n",
|
|
(sfail < 7 ? "ignoring"
|
|
: "partial"), sfail,
|
|
#ifdef __FreeBSD__
|
|
(unsigned long long)be64toh(st->id),
|
|
#else
|
|
betoh64(st->id),
|
|
#endif
|
|
ntohl(st->creatorid));
|
|
pfsyncstats.pfsyncs_badstate++;
|
|
|
|
if (!(sp->sync_flags & PFSTATE_STALE)) {
|
|
/* we have a better state, send it */
|
|
if (sc->sc_mbuf != NULL && !stale)
|
|
pfsync_sendout(sc);
|
|
stale++;
|
|
if (!st->sync_flags)
|
|
pfsync_pack_state(
|
|
PFSYNC_ACT_UPD, st, flags);
|
|
}
|
|
continue;
|
|
}
|
|
pf_state_peer_ntoh(&sp->src, &st->src);
|
|
pf_state_peer_ntoh(&sp->dst, &st->dst);
|
|
st->expire = ntohl(sp->expire) + time_second;
|
|
st->timeout = sp->timeout;
|
|
}
|
|
if (stale && sc->sc_mbuf != NULL)
|
|
pfsync_sendout(sc);
|
|
#ifdef __FreeBSD__
|
|
PF_UNLOCK();
|
|
#endif
|
|
splx(s);
|
|
break;
|
|
/*
|
|
* It's not strictly necessary for us to support the "uncompressed"
|
|
* delete action, but it's relatively simple and maintains consistency.
|
|
*/
|
|
case PFSYNC_ACT_DEL:
|
|
if ((mp = m_pulldown(m, iplen + sizeof(*ph),
|
|
count * sizeof(*sp), &offp)) == NULL) {
|
|
pfsyncstats.pfsyncs_badlen++;
|
|
return;
|
|
}
|
|
|
|
s = splsoftnet();
|
|
#ifdef __FreeBSD__
|
|
PF_LOCK();
|
|
#endif
|
|
for (i = 0, sp = (struct pfsync_state *)(mp->m_data + offp);
|
|
i < count; i++, sp++) {
|
|
bcopy(sp->id, &key.id, sizeof(key.id));
|
|
key.creatorid = sp->creatorid;
|
|
|
|
st = pf_find_state_byid(&key);
|
|
if (st == NULL) {
|
|
pfsyncstats.pfsyncs_badstate++;
|
|
continue;
|
|
}
|
|
st->timeout = PFTM_PURGE;
|
|
st->sync_flags |= PFSTATE_FROMSYNC;
|
|
pf_purge_expired_state(st);
|
|
}
|
|
#ifdef __FreeBSD__
|
|
PF_UNLOCK();
|
|
#endif
|
|
splx(s);
|
|
break;
|
|
case PFSYNC_ACT_UPD_C: {
|
|
int update_requested = 0;
|
|
|
|
if ((mp = m_pulldown(m, iplen + sizeof(*ph),
|
|
count * sizeof(*up), &offp)) == NULL) {
|
|
pfsyncstats.pfsyncs_badlen++;
|
|
return;
|
|
}
|
|
|
|
s = splsoftnet();
|
|
#ifdef __FreeBSD__
|
|
PF_LOCK();
|
|
#endif
|
|
for (i = 0, up = (struct pfsync_state_upd *)(mp->m_data + offp);
|
|
i < count; i++, up++) {
|
|
/* check for invalid values */
|
|
if (up->timeout >= PFTM_MAX ||
|
|
up->src.state > PF_TCPS_PROXY_DST ||
|
|
up->dst.state > PF_TCPS_PROXY_DST) {
|
|
if (pf_status.debug >= PF_DEBUG_MISC)
|
|
printf("pfsync_insert: "
|
|
"PFSYNC_ACT_UPD_C: "
|
|
"invalid value\n");
|
|
pfsyncstats.pfsyncs_badstate++;
|
|
continue;
|
|
}
|
|
|
|
bcopy(up->id, &key.id, sizeof(key.id));
|
|
key.creatorid = up->creatorid;
|
|
|
|
st = pf_find_state_byid(&key);
|
|
if (st == NULL) {
|
|
/* We don't have this state. Ask for it. */
|
|
error = pfsync_request_update(up, &src);
|
|
if (error == ENOMEM) {
|
|
splx(s);
|
|
goto done;
|
|
}
|
|
update_requested = 1;
|
|
pfsyncstats.pfsyncs_badstate++;
|
|
continue;
|
|
}
|
|
sfail = 0;
|
|
if (st->proto == IPPROTO_TCP) {
|
|
/*
|
|
* The state should never go backwards except
|
|
* for syn-proxy states. Neither should the
|
|
* sequence window slide backwards.
|
|
*/
|
|
if (st->src.state > up->src.state &&
|
|
(st->src.state < PF_TCPS_PROXY_SRC ||
|
|
up->src.state >= PF_TCPS_PROXY_SRC))
|
|
sfail = 1;
|
|
else if (st->dst.state > up->dst.state)
|
|
sfail = 2;
|
|
else if (SEQ_GT(st->src.seqlo,
|
|
ntohl(up->src.seqlo)))
|
|
sfail = 3;
|
|
else if (st->dst.state >= TCPS_SYN_SENT &&
|
|
SEQ_GT(st->dst.seqlo, ntohl(up->dst.seqlo)))
|
|
sfail = 4;
|
|
} else {
|
|
/*
|
|
* Non-TCP protocol state machine always go
|
|
* forwards
|
|
*/
|
|
if (st->src.state > up->src.state)
|
|
sfail = 5;
|
|
else if (st->dst.state > up->dst.state)
|
|
sfail = 6;
|
|
}
|
|
if (sfail) {
|
|
if (pf_status.debug >= PF_DEBUG_MISC)
|
|
printf("pfsync: ignoring stale update "
|
|
"(%d) id: %016llx "
|
|
"creatorid: %08x\n", sfail,
|
|
#ifdef __FreeBSD__
|
|
(unsigned long long)be64toh(st->id),
|
|
#else
|
|
betoh64(st->id),
|
|
#endif
|
|
ntohl(st->creatorid));
|
|
pfsyncstats.pfsyncs_badstate++;
|
|
|
|
/* we have a better state, send it out */
|
|
if ((!stale || update_requested) &&
|
|
sc->sc_mbuf != NULL) {
|
|
pfsync_sendout(sc);
|
|
update_requested = 0;
|
|
}
|
|
stale++;
|
|
if (!st->sync_flags)
|
|
pfsync_pack_state(PFSYNC_ACT_UPD, st,
|
|
PFSYNC_FLAG_STALE);
|
|
continue;
|
|
}
|
|
pf_state_peer_ntoh(&up->src, &st->src);
|
|
pf_state_peer_ntoh(&up->dst, &st->dst);
|
|
st->expire = ntohl(up->expire) + time_second;
|
|
st->timeout = up->timeout;
|
|
}
|
|
if ((update_requested || stale) && sc->sc_mbuf)
|
|
pfsync_sendout(sc);
|
|
#ifdef __FreeBSD__
|
|
PF_UNLOCK();
|
|
#endif
|
|
splx(s);
|
|
break;
|
|
}
|
|
case PFSYNC_ACT_DEL_C:
|
|
if ((mp = m_pulldown(m, iplen + sizeof(*ph),
|
|
count * sizeof(*dp), &offp)) == NULL) {
|
|
pfsyncstats.pfsyncs_badlen++;
|
|
return;
|
|
}
|
|
|
|
s = splsoftnet();
|
|
#ifdef __FreeBSD__
|
|
PF_LOCK();
|
|
#endif
|
|
for (i = 0, dp = (struct pfsync_state_del *)(mp->m_data + offp);
|
|
i < count; i++, dp++) {
|
|
bcopy(dp->id, &key.id, sizeof(key.id));
|
|
key.creatorid = dp->creatorid;
|
|
|
|
st = pf_find_state_byid(&key);
|
|
if (st == NULL) {
|
|
pfsyncstats.pfsyncs_badstate++;
|
|
continue;
|
|
}
|
|
st->timeout = PFTM_PURGE;
|
|
st->sync_flags |= PFSTATE_FROMSYNC;
|
|
pf_purge_expired_state(st);
|
|
}
|
|
#ifdef __FreeBSD__
|
|
PF_UNLOCK();
|
|
#endif
|
|
splx(s);
|
|
break;
|
|
case PFSYNC_ACT_INS_F:
|
|
case PFSYNC_ACT_DEL_F:
|
|
/* not implemented */
|
|
break;
|
|
case PFSYNC_ACT_UREQ:
|
|
if ((mp = m_pulldown(m, iplen + sizeof(*ph),
|
|
count * sizeof(*rup), &offp)) == NULL) {
|
|
pfsyncstats.pfsyncs_badlen++;
|
|
return;
|
|
}
|
|
|
|
s = splsoftnet();
|
|
#ifdef __FreeBSD__
|
|
PF_LOCK();
|
|
#endif
|
|
if (sc->sc_mbuf != NULL)
|
|
pfsync_sendout(sc);
|
|
for (i = 0,
|
|
rup = (struct pfsync_state_upd_req *)(mp->m_data + offp);
|
|
i < count; i++, rup++) {
|
|
bcopy(rup->id, &key.id, sizeof(key.id));
|
|
key.creatorid = rup->creatorid;
|
|
|
|
if (key.id == 0 && key.creatorid == 0) {
|
|
sc->sc_ureq_received = time_uptime;
|
|
if (pf_status.debug >= PF_DEBUG_MISC)
|
|
printf("pfsync: received "
|
|
"bulk update request\n");
|
|
pfsync_send_bus(sc, PFSYNC_BUS_START);
|
|
#ifdef __FreeBSD__
|
|
callout_reset(&sc->sc_bulk_tmo, 1 * hz,
|
|
pfsync_bulk_update,
|
|
LIST_FIRST(&pfsync_list));
|
|
#else
|
|
timeout_add(&sc->sc_bulk_tmo, 1 * hz);
|
|
#endif
|
|
} else {
|
|
st = pf_find_state_byid(&key);
|
|
if (st == NULL) {
|
|
pfsyncstats.pfsyncs_badstate++;
|
|
continue;
|
|
}
|
|
if (!st->sync_flags)
|
|
pfsync_pack_state(PFSYNC_ACT_UPD,
|
|
st, 0);
|
|
}
|
|
}
|
|
if (sc->sc_mbuf != NULL)
|
|
pfsync_sendout(sc);
|
|
#ifdef __FreeBSD__
|
|
PF_UNLOCK();
|
|
#endif
|
|
splx(s);
|
|
break;
|
|
case PFSYNC_ACT_BUS:
|
|
/* If we're not waiting for a bulk update, who cares. */
|
|
if (sc->sc_ureq_sent == 0)
|
|
break;
|
|
|
|
if ((mp = m_pulldown(m, iplen + sizeof(*ph),
|
|
sizeof(*bus), &offp)) == NULL) {
|
|
pfsyncstats.pfsyncs_badlen++;
|
|
return;
|
|
}
|
|
bus = (struct pfsync_state_bus *)(mp->m_data + offp);
|
|
switch (bus->status) {
|
|
case PFSYNC_BUS_START:
|
|
#ifdef __FreeBSD__
|
|
callout_reset(&sc->sc_bulkfail_tmo,
|
|
pf_pool_limits[PF_LIMIT_STATES].limit /
|
|
(PFSYNC_BULKPACKETS * sc->sc_maxcount),
|
|
pfsync_bulkfail, LIST_FIRST(&pfsync_list));
|
|
#else
|
|
timeout_add(&sc->sc_bulkfail_tmo,
|
|
pf_pool_limits[PF_LIMIT_STATES].limit /
|
|
(PFSYNC_BULKPACKETS * sc->sc_maxcount));
|
|
#endif
|
|
if (pf_status.debug >= PF_DEBUG_MISC)
|
|
printf("pfsync: received bulk "
|
|
"update start\n");
|
|
break;
|
|
case PFSYNC_BUS_END:
|
|
if (time_uptime - ntohl(bus->endtime) >=
|
|
sc->sc_ureq_sent) {
|
|
/* that's it, we're happy */
|
|
sc->sc_ureq_sent = 0;
|
|
sc->sc_bulk_tries = 0;
|
|
#ifdef __FreeBSD__
|
|
callout_stop(&sc->sc_bulkfail_tmo);
|
|
#else
|
|
timeout_del(&sc->sc_bulkfail_tmo);
|
|
#endif
|
|
#if NCARP > 0 /* XXX_IMPORT */
|
|
if (!pfsync_sync_ok)
|
|
carp_suppress_preempt--;
|
|
#endif
|
|
pfsync_sync_ok = 1;
|
|
if (pf_status.debug >= PF_DEBUG_MISC)
|
|
printf("pfsync: received valid "
|
|
"bulk update end\n");
|
|
} else {
|
|
if (pf_status.debug >= PF_DEBUG_MISC)
|
|
printf("pfsync: received invalid "
|
|
"bulk update end: bad timestamp\n");
|
|
}
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
|
|
done:
|
|
if (m)
|
|
m_freem(m);
|
|
}
|
|
|
|
int
|
|
pfsyncoutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
|
|
struct rtentry *rt)
|
|
{
|
|
m_freem(m);
|
|
return (0);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
int
|
|
pfsyncioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
|
|
{
|
|
#ifndef __FreeBSD__
|
|
struct proc *p = curproc;
|
|
#endif
|
|
struct pfsync_softc *sc = ifp->if_softc;
|
|
struct ifreq *ifr = (struct ifreq *)data;
|
|
struct ip_moptions *imo = &sc->sc_imo;
|
|
struct pfsyncreq pfsyncr;
|
|
struct ifnet *sifp;
|
|
int s, error;
|
|
|
|
switch (cmd) {
|
|
case SIOCSIFADDR:
|
|
case SIOCAIFADDR:
|
|
case SIOCSIFDSTADDR:
|
|
case SIOCSIFFLAGS:
|
|
#ifdef __FreeBSD__
|
|
if (ifp->if_flags & IFF_UP)
|
|
ifp->if_drv_flags |= IFF_DRV_RUNNING;
|
|
else
|
|
ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
|
|
#else
|
|
if (ifp->if_flags & IFF_UP)
|
|
ifp->if_flags |= IFF_RUNNING;
|
|
else
|
|
ifp->if_flags &= ~IFF_RUNNING;
|
|
#endif
|
|
break;
|
|
case SIOCSIFMTU:
|
|
if (ifr->ifr_mtu < PFSYNC_MINMTU)
|
|
return (EINVAL);
|
|
if (ifr->ifr_mtu > MCLBYTES)
|
|
ifr->ifr_mtu = MCLBYTES;
|
|
s = splnet();
|
|
#ifdef __FreeBSD__
|
|
PF_LOCK();
|
|
#endif
|
|
if (ifr->ifr_mtu < ifp->if_mtu) {
|
|
pfsync_sendout(sc);
|
|
}
|
|
pfsync_setmtu(sc, ifr->ifr_mtu);
|
|
#ifdef __FreeBSD__
|
|
PF_UNLOCK();
|
|
#endif
|
|
splx(s);
|
|
break;
|
|
case SIOCGETPFSYNC:
|
|
#ifdef __FreeBSD__
|
|
/* XXX: read unlocked */
|
|
#endif
|
|
bzero(&pfsyncr, sizeof(pfsyncr));
|
|
if (sc->sc_sync_ifp)
|
|
strlcpy(pfsyncr.pfsyncr_syncdev,
|
|
sc->sc_sync_ifp->if_xname, IFNAMSIZ);
|
|
pfsyncr.pfsyncr_syncpeer = sc->sc_sync_peer;
|
|
pfsyncr.pfsyncr_maxupdates = sc->sc_maxupdates;
|
|
if ((error = copyout(&pfsyncr, ifr->ifr_data, sizeof(pfsyncr))))
|
|
return (error);
|
|
break;
|
|
case SIOCSETPFSYNC:
|
|
#ifdef __FreeBSD__
|
|
if ((error = suser(curthread)) != 0)
|
|
#else
|
|
if ((error = suser(p, p->p_acflag)) != 0)
|
|
#endif
|
|
return (error);
|
|
if ((error = copyin(ifr->ifr_data, &pfsyncr, sizeof(pfsyncr))))
|
|
return (error);
|
|
|
|
if (pfsyncr.pfsyncr_syncpeer.s_addr == 0)
|
|
sc->sc_sync_peer.s_addr = INADDR_PFSYNC_GROUP;
|
|
else
|
|
sc->sc_sync_peer.s_addr =
|
|
pfsyncr.pfsyncr_syncpeer.s_addr;
|
|
|
|
if (pfsyncr.pfsyncr_maxupdates > 255)
|
|
return (EINVAL);
|
|
#ifdef __FreeBSD__
|
|
callout_drain(&sc->sc_send_tmo);
|
|
PF_LOCK();
|
|
#endif
|
|
sc->sc_maxupdates = pfsyncr.pfsyncr_maxupdates;
|
|
|
|
if (pfsyncr.pfsyncr_syncdev[0] == 0) {
|
|
sc->sc_sync_ifp = NULL;
|
|
if (sc->sc_mbuf_net != NULL) {
|
|
/* Don't keep stale pfsync packets around. */
|
|
s = splnet();
|
|
m_freem(sc->sc_mbuf_net);
|
|
sc->sc_mbuf_net = NULL;
|
|
sc->sc_statep_net.s = NULL;
|
|
splx(s);
|
|
}
|
|
if (imo->imo_num_memberships > 0) {
|
|
in_delmulti(imo->imo_membership[--imo->imo_num_memberships]);
|
|
imo->imo_multicast_ifp = NULL;
|
|
}
|
|
#ifdef __FreeBSD__
|
|
PF_UNLOCK();
|
|
#endif
|
|
break;
|
|
}
|
|
|
|
if ((sifp = ifunit(pfsyncr.pfsyncr_syncdev)) == NULL) {
|
|
#ifdef __FreeBSD__
|
|
PF_UNLOCK();
|
|
#endif
|
|
return (EINVAL);
|
|
}
|
|
|
|
s = splnet();
|
|
#ifdef __FreeBSD__
|
|
if (sifp->if_mtu < SCP2IFP(sc)->if_mtu ||
|
|
#else
|
|
if (sifp->if_mtu < sc->sc_if.if_mtu ||
|
|
#endif
|
|
(sc->sc_sync_ifp != NULL &&
|
|
sifp->if_mtu < sc->sc_sync_ifp->if_mtu) ||
|
|
sifp->if_mtu < MCLBYTES - sizeof(struct ip))
|
|
pfsync_sendout(sc);
|
|
sc->sc_sync_ifp = sifp;
|
|
|
|
#ifdef __FreeBSD__
|
|
pfsync_setmtu(sc, SCP2IFP(sc)->if_mtu);
|
|
#else
|
|
pfsync_setmtu(sc, sc->sc_if.if_mtu);
|
|
#endif
|
|
|
|
if (imo->imo_num_memberships > 0) {
|
|
in_delmulti(imo->imo_membership[--imo->imo_num_memberships]);
|
|
imo->imo_multicast_ifp = NULL;
|
|
}
|
|
|
|
if (sc->sc_sync_ifp &&
|
|
sc->sc_sync_peer.s_addr == INADDR_PFSYNC_GROUP) {
|
|
struct in_addr addr;
|
|
|
|
if (!(sc->sc_sync_ifp->if_flags & IFF_MULTICAST)) {
|
|
sc->sc_sync_ifp = NULL;
|
|
#ifdef __FreeBSD__
|
|
PF_UNLOCK();
|
|
#endif
|
|
splx(s);
|
|
return (EADDRNOTAVAIL);
|
|
}
|
|
#ifdef __FreeBSD__
|
|
PF_UNLOCK(); /* addmulti mallocs w/ WAITOK */
|
|
addr.s_addr = htonl(INADDR_PFSYNC_GROUP);
|
|
#else
|
|
addr.s_addr = INADDR_PFSYNC_GROUP;
|
|
#endif
|
|
|
|
if ((imo->imo_membership[0] =
|
|
in_addmulti(&addr, sc->sc_sync_ifp)) == NULL) {
|
|
sc->sc_sync_ifp = NULL;
|
|
splx(s);
|
|
return (ENOBUFS);
|
|
}
|
|
imo->imo_num_memberships++;
|
|
imo->imo_multicast_ifp = sc->sc_sync_ifp;
|
|
imo->imo_multicast_ttl = PFSYNC_DFLTTL;
|
|
imo->imo_multicast_loop = 0;
|
|
}
|
|
|
|
if (sc->sc_sync_ifp ||
|
|
sc->sc_sendaddr.s_addr != INADDR_PFSYNC_GROUP) {
|
|
/* Request a full state table update. */
|
|
#ifdef __FreeBSD__
|
|
PF_LOCK();
|
|
#endif
|
|
sc->sc_ureq_sent = time_uptime;
|
|
#if NCARP > 0
|
|
if (pfsync_sync_ok)
|
|
carp_suppress_preempt++;
|
|
#endif
|
|
pfsync_sync_ok = 0;
|
|
if (pf_status.debug >= PF_DEBUG_MISC)
|
|
printf("pfsync: requesting bulk update\n");
|
|
#ifdef __FreeBSD__
|
|
callout_reset(&sc->sc_bulkfail_tmo, 5 * hz,
|
|
pfsync_bulkfail, LIST_FIRST(&pfsync_list));
|
|
#else
|
|
timeout_add(&sc->sc_bulkfail_tmo, 5 * hz);
|
|
#endif
|
|
error = pfsync_request_update(NULL, NULL);
|
|
if (error == ENOMEM) {
|
|
#ifdef __FreeBSD__
|
|
PF_UNLOCK();
|
|
#endif
|
|
splx(s);
|
|
return (ENOMEM);
|
|
}
|
|
pfsync_sendout(sc);
|
|
}
|
|
#ifdef __FreeBSD__
|
|
PF_UNLOCK();
|
|
#endif
|
|
splx(s);
|
|
|
|
break;
|
|
|
|
default:
|
|
return (ENOTTY);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
pfsync_setmtu(struct pfsync_softc *sc, int mtu_req)
|
|
{
|
|
int mtu;
|
|
|
|
if (sc->sc_sync_ifp && sc->sc_sync_ifp->if_mtu < mtu_req)
|
|
mtu = sc->sc_sync_ifp->if_mtu;
|
|
else
|
|
mtu = mtu_req;
|
|
|
|
sc->sc_maxcount = (mtu - sizeof(struct pfsync_header)) /
|
|
sizeof(struct pfsync_state);
|
|
if (sc->sc_maxcount > 254)
|
|
sc->sc_maxcount = 254;
|
|
#ifdef __FreeBSD__
|
|
SCP2IFP(sc)->if_mtu = sizeof(struct pfsync_header) +
|
|
sc->sc_maxcount * sizeof(struct pfsync_state);
|
|
#else
|
|
sc->sc_if.if_mtu = sizeof(struct pfsync_header) +
|
|
sc->sc_maxcount * sizeof(struct pfsync_state);
|
|
#endif
|
|
}
|
|
|
|
struct mbuf *
|
|
pfsync_get_mbuf(struct pfsync_softc *sc, u_int8_t action, void **sp)
|
|
{
|
|
struct pfsync_header *h;
|
|
struct mbuf *m;
|
|
int len;
|
|
|
|
#ifdef __FreeBSD__
|
|
PF_ASSERT(MA_OWNED);
|
|
#endif
|
|
MGETHDR(m, M_DONTWAIT, MT_DATA);
|
|
if (m == NULL) {
|
|
#ifdef __FreeBSD__
|
|
SCP2IFP(sc)->if_oerrors++;
|
|
#else
|
|
sc->sc_if.if_oerrors++;
|
|
#endif
|
|
return (NULL);
|
|
}
|
|
|
|
switch (action) {
|
|
case PFSYNC_ACT_CLR:
|
|
len = sizeof(struct pfsync_header) +
|
|
sizeof(struct pfsync_state_clr);
|
|
break;
|
|
case PFSYNC_ACT_UPD_C:
|
|
len = (sc->sc_maxcount * sizeof(struct pfsync_state_upd)) +
|
|
sizeof(struct pfsync_header);
|
|
break;
|
|
case PFSYNC_ACT_DEL_C:
|
|
len = (sc->sc_maxcount * sizeof(struct pfsync_state_del)) +
|
|
sizeof(struct pfsync_header);
|
|
break;
|
|
case PFSYNC_ACT_UREQ:
|
|
len = (sc->sc_maxcount * sizeof(struct pfsync_state_upd_req)) +
|
|
sizeof(struct pfsync_header);
|
|
break;
|
|
case PFSYNC_ACT_BUS:
|
|
len = sizeof(struct pfsync_header) +
|
|
sizeof(struct pfsync_state_bus);
|
|
break;
|
|
default:
|
|
len = (sc->sc_maxcount * sizeof(struct pfsync_state)) +
|
|
sizeof(struct pfsync_header);
|
|
break;
|
|
}
|
|
|
|
if (len > MHLEN) {
|
|
MCLGET(m, M_DONTWAIT);
|
|
if ((m->m_flags & M_EXT) == 0) {
|
|
m_free(m);
|
|
#ifdef __FreeBSD__
|
|
SCP2IFP(sc)->if_oerrors++;
|
|
#else
|
|
sc->sc_if.if_oerrors++;
|
|
#endif
|
|
return (NULL);
|
|
}
|
|
m->m_data += (MCLBYTES - len) &~ (sizeof(long) - 1);
|
|
} else
|
|
MH_ALIGN(m, len);
|
|
|
|
m->m_pkthdr.rcvif = NULL;
|
|
m->m_pkthdr.len = m->m_len = sizeof(struct pfsync_header);
|
|
h = mtod(m, struct pfsync_header *);
|
|
h->version = PFSYNC_VERSION;
|
|
h->af = 0;
|
|
h->count = 0;
|
|
h->action = action;
|
|
|
|
*sp = (void *)((char *)h + PFSYNC_HDRLEN);
|
|
#ifdef __FreeBSD__
|
|
callout_reset(&sc->sc_tmo, hz, pfsync_timeout,
|
|
LIST_FIRST(&pfsync_list));
|
|
#else
|
|
timeout_add(&sc->sc_tmo, hz);
|
|
#endif
|
|
return (m);
|
|
}
|
|
|
|
int
|
|
pfsync_pack_state(u_int8_t action, struct pf_state *st, int flags)
|
|
{
|
|
#ifdef __FreeBSD__
|
|
struct ifnet *ifp = SCP2IFP(LIST_FIRST(&pfsync_list));
|
|
#else
|
|
struct ifnet *ifp = &pfsyncif.sc_if;
|
|
#endif
|
|
struct pfsync_softc *sc = ifp->if_softc;
|
|
struct pfsync_header *h, *h_net;
|
|
struct pfsync_state *sp = NULL;
|
|
struct pfsync_state_upd *up = NULL;
|
|
struct pfsync_state_del *dp = NULL;
|
|
struct pf_rule *r;
|
|
u_long secs;
|
|
int s, ret = 0;
|
|
u_int8_t i = 255, newaction = 0;
|
|
|
|
#ifdef __FreeBSD__
|
|
PF_ASSERT(MA_OWNED);
|
|
#endif
|
|
/*
|
|
* If a packet falls in the forest and there's nobody around to
|
|
* hear, does it make a sound?
|
|
*/
|
|
if (ifp->if_bpf == NULL && sc->sc_sync_ifp == NULL &&
|
|
sc->sc_sync_peer.s_addr == INADDR_PFSYNC_GROUP) {
|
|
/* Don't leave any stale pfsync packets hanging around. */
|
|
if (sc->sc_mbuf != NULL) {
|
|
m_freem(sc->sc_mbuf);
|
|
sc->sc_mbuf = NULL;
|
|
sc->sc_statep.s = NULL;
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
if (action >= PFSYNC_ACT_MAX)
|
|
return (EINVAL);
|
|
|
|
s = splnet();
|
|
if (sc->sc_mbuf == NULL) {
|
|
if ((sc->sc_mbuf = pfsync_get_mbuf(sc, action,
|
|
(void *)&sc->sc_statep.s)) == NULL) {
|
|
splx(s);
|
|
return (ENOMEM);
|
|
}
|
|
h = mtod(sc->sc_mbuf, struct pfsync_header *);
|
|
} else {
|
|
h = mtod(sc->sc_mbuf, struct pfsync_header *);
|
|
if (h->action != action) {
|
|
pfsync_sendout(sc);
|
|
if ((sc->sc_mbuf = pfsync_get_mbuf(sc, action,
|
|
(void *)&sc->sc_statep.s)) == NULL) {
|
|
splx(s);
|
|
return (ENOMEM);
|
|
}
|
|
h = mtod(sc->sc_mbuf, struct pfsync_header *);
|
|
} else {
|
|
/*
|
|
* If it's an update, look in the packet to see if
|
|
* we already have an update for the state.
|
|
*/
|
|
if (action == PFSYNC_ACT_UPD && sc->sc_maxupdates) {
|
|
struct pfsync_state *usp =
|
|
(void *)((char *)h + PFSYNC_HDRLEN);
|
|
|
|
for (i = 0; i < h->count; i++) {
|
|
if (!memcmp(usp->id, &st->id,
|
|
PFSYNC_ID_LEN) &&
|
|
usp->creatorid == st->creatorid) {
|
|
sp = usp;
|
|
sp->updates++;
|
|
break;
|
|
}
|
|
usp++;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
secs = time_second;
|
|
|
|
st->pfsync_time = time_uptime;
|
|
TAILQ_REMOVE(&state_updates, st, u.s.entry_updates);
|
|
TAILQ_INSERT_TAIL(&state_updates, st, u.s.entry_updates);
|
|
|
|
if (sp == NULL) {
|
|
/* not a "duplicate" update */
|
|
i = 255;
|
|
sp = sc->sc_statep.s++;
|
|
sc->sc_mbuf->m_pkthdr.len =
|
|
sc->sc_mbuf->m_len += sizeof(struct pfsync_state);
|
|
h->count++;
|
|
bzero(sp, sizeof(*sp));
|
|
|
|
bcopy(&st->id, sp->id, sizeof(sp->id));
|
|
sp->creatorid = st->creatorid;
|
|
|
|
strlcpy(sp->ifname, st->u.s.kif->pfik_name, sizeof(sp->ifname));
|
|
pf_state_host_hton(&st->lan, &sp->lan);
|
|
pf_state_host_hton(&st->gwy, &sp->gwy);
|
|
pf_state_host_hton(&st->ext, &sp->ext);
|
|
|
|
bcopy(&st->rt_addr, &sp->rt_addr, sizeof(sp->rt_addr));
|
|
|
|
sp->creation = htonl(secs - st->creation);
|
|
sp->packets[0] = htonl(st->packets[0]);
|
|
sp->packets[1] = htonl(st->packets[1]);
|
|
sp->bytes[0] = htonl(st->bytes[0]);
|
|
sp->bytes[1] = htonl(st->bytes[1]);
|
|
if ((r = st->rule.ptr) == NULL)
|
|
sp->rule = htonl(-1);
|
|
else
|
|
sp->rule = htonl(r->nr);
|
|
if ((r = st->anchor.ptr) == NULL)
|
|
sp->anchor = htonl(-1);
|
|
else
|
|
sp->anchor = htonl(r->nr);
|
|
sp->af = st->af;
|
|
sp->proto = st->proto;
|
|
sp->direction = st->direction;
|
|
sp->log = st->log;
|
|
sp->allow_opts = st->allow_opts;
|
|
sp->timeout = st->timeout;
|
|
|
|
if (flags & PFSYNC_FLAG_STALE)
|
|
sp->sync_flags |= PFSTATE_STALE;
|
|
}
|
|
|
|
pf_state_peer_hton(&st->src, &sp->src);
|
|
pf_state_peer_hton(&st->dst, &sp->dst);
|
|
|
|
if (st->expire <= secs)
|
|
sp->expire = htonl(0);
|
|
else
|
|
sp->expire = htonl(st->expire - secs);
|
|
|
|
/* do we need to build "compressed" actions for network transfer? */
|
|
if (sc->sc_sync_ifp && flags & PFSYNC_FLAG_COMPRESS) {
|
|
switch (action) {
|
|
case PFSYNC_ACT_UPD:
|
|
newaction = PFSYNC_ACT_UPD_C;
|
|
break;
|
|
case PFSYNC_ACT_DEL:
|
|
newaction = PFSYNC_ACT_DEL_C;
|
|
break;
|
|
default:
|
|
/* by default we just send the uncompressed states */
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (newaction) {
|
|
if (sc->sc_mbuf_net == NULL) {
|
|
if ((sc->sc_mbuf_net = pfsync_get_mbuf(sc, newaction,
|
|
(void *)&sc->sc_statep_net.s)) == NULL) {
|
|
splx(s);
|
|
return (ENOMEM);
|
|
}
|
|
}
|
|
h_net = mtod(sc->sc_mbuf_net, struct pfsync_header *);
|
|
|
|
switch (newaction) {
|
|
case PFSYNC_ACT_UPD_C:
|
|
if (i != 255) {
|
|
up = (void *)((char *)h_net +
|
|
PFSYNC_HDRLEN + (i * sizeof(*up)));
|
|
up->updates++;
|
|
} else {
|
|
h_net->count++;
|
|
sc->sc_mbuf_net->m_pkthdr.len =
|
|
sc->sc_mbuf_net->m_len += sizeof(*up);
|
|
up = sc->sc_statep_net.u++;
|
|
|
|
bzero(up, sizeof(*up));
|
|
bcopy(&st->id, up->id, sizeof(up->id));
|
|
up->creatorid = st->creatorid;
|
|
}
|
|
up->timeout = st->timeout;
|
|
up->expire = sp->expire;
|
|
up->src = sp->src;
|
|
up->dst = sp->dst;
|
|
break;
|
|
case PFSYNC_ACT_DEL_C:
|
|
sc->sc_mbuf_net->m_pkthdr.len =
|
|
sc->sc_mbuf_net->m_len += sizeof(*dp);
|
|
dp = sc->sc_statep_net.d++;
|
|
h_net->count++;
|
|
|
|
bzero(dp, sizeof(*dp));
|
|
bcopy(&st->id, dp->id, sizeof(dp->id));
|
|
dp->creatorid = st->creatorid;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (h->count == sc->sc_maxcount ||
|
|
(sc->sc_maxupdates && (sp->updates >= sc->sc_maxupdates)))
|
|
ret = pfsync_sendout(sc);
|
|
|
|
splx(s);
|
|
return (ret);
|
|
}
|
|
|
|
/* This must be called in splnet() */
|
|
int
|
|
pfsync_request_update(struct pfsync_state_upd *up, struct in_addr *src)
|
|
{
|
|
#ifdef __FreeBSD__
|
|
struct ifnet *ifp = SCP2IFP(LIST_FIRST(&pfsync_list));
|
|
#else
|
|
struct ifnet *ifp = &pfsyncif.sc_if;
|
|
#endif
|
|
struct pfsync_header *h;
|
|
struct pfsync_softc *sc = ifp->if_softc;
|
|
struct pfsync_state_upd_req *rup;
|
|
int ret = 0;
|
|
|
|
#ifdef __FreeBSD__
|
|
PF_ASSERT(MA_OWNED);
|
|
#endif
|
|
if (sc->sc_mbuf == NULL) {
|
|
if ((sc->sc_mbuf = pfsync_get_mbuf(sc, PFSYNC_ACT_UREQ,
|
|
(void *)&sc->sc_statep.s)) == NULL)
|
|
return (ENOMEM);
|
|
h = mtod(sc->sc_mbuf, struct pfsync_header *);
|
|
} else {
|
|
h = mtod(sc->sc_mbuf, struct pfsync_header *);
|
|
if (h->action != PFSYNC_ACT_UREQ) {
|
|
pfsync_sendout(sc);
|
|
if ((sc->sc_mbuf = pfsync_get_mbuf(sc, PFSYNC_ACT_UREQ,
|
|
(void *)&sc->sc_statep.s)) == NULL)
|
|
return (ENOMEM);
|
|
h = mtod(sc->sc_mbuf, struct pfsync_header *);
|
|
}
|
|
}
|
|
|
|
if (src != NULL)
|
|
sc->sc_sendaddr = *src;
|
|
sc->sc_mbuf->m_pkthdr.len = sc->sc_mbuf->m_len += sizeof(*rup);
|
|
h->count++;
|
|
rup = sc->sc_statep.r++;
|
|
bzero(rup, sizeof(*rup));
|
|
if (up != NULL) {
|
|
bcopy(up->id, rup->id, sizeof(rup->id));
|
|
rup->creatorid = up->creatorid;
|
|
}
|
|
|
|
if (h->count == sc->sc_maxcount)
|
|
ret = pfsync_sendout(sc);
|
|
|
|
return (ret);
|
|
}
|
|
|
|
int
|
|
pfsync_clear_states(u_int32_t creatorid, char *ifname)
|
|
{
|
|
#ifdef __FreeBSD__
|
|
struct ifnet *ifp = SCP2IFP(LIST_FIRST(&pfsync_list));
|
|
#else
|
|
struct ifnet *ifp = &pfsyncif.sc_if;
|
|
#endif
|
|
struct pfsync_softc *sc = ifp->if_softc;
|
|
struct pfsync_state_clr *cp;
|
|
int s, ret;
|
|
|
|
s = splnet();
|
|
#ifdef __FreeBSD__
|
|
PF_ASSERT(MA_OWNED);
|
|
#endif
|
|
if (sc->sc_mbuf != NULL)
|
|
pfsync_sendout(sc);
|
|
if ((sc->sc_mbuf = pfsync_get_mbuf(sc, PFSYNC_ACT_CLR,
|
|
(void *)&sc->sc_statep.c)) == NULL) {
|
|
splx(s);
|
|
return (ENOMEM);
|
|
}
|
|
sc->sc_mbuf->m_pkthdr.len = sc->sc_mbuf->m_len += sizeof(*cp);
|
|
cp = sc->sc_statep.c;
|
|
cp->creatorid = creatorid;
|
|
if (ifname != NULL)
|
|
strlcpy(cp->ifname, ifname, IFNAMSIZ);
|
|
|
|
ret = (pfsync_sendout(sc));
|
|
splx(s);
|
|
return (ret);
|
|
}
|
|
|
|
void
|
|
pfsync_timeout(void *v)
|
|
{
|
|
struct pfsync_softc *sc = v;
|
|
int s;
|
|
|
|
s = splnet();
|
|
#ifdef __FreeBSD__
|
|
PF_LOCK();
|
|
#endif
|
|
pfsync_sendout(sc);
|
|
#ifdef __FreeBSD__
|
|
PF_UNLOCK();
|
|
#endif
|
|
splx(s);
|
|
}
|
|
|
|
/* This must be called in splnet() */
|
|
void
|
|
pfsync_send_bus(struct pfsync_softc *sc, u_int8_t status)
|
|
{
|
|
struct pfsync_state_bus *bus;
|
|
|
|
#ifdef __FreeBSD__
|
|
PF_ASSERT(MA_OWNED);
|
|
#endif
|
|
if (sc->sc_mbuf != NULL)
|
|
pfsync_sendout(sc);
|
|
|
|
if (pfsync_sync_ok &&
|
|
(sc->sc_mbuf = pfsync_get_mbuf(sc, PFSYNC_ACT_BUS,
|
|
(void *)&sc->sc_statep.b)) != NULL) {
|
|
sc->sc_mbuf->m_pkthdr.len = sc->sc_mbuf->m_len += sizeof(*bus);
|
|
bus = sc->sc_statep.b;
|
|
bus->creatorid = pf_status.hostid;
|
|
bus->status = status;
|
|
bus->endtime = htonl(time_uptime - sc->sc_ureq_received);
|
|
pfsync_sendout(sc);
|
|
}
|
|
}
|
|
|
|
void
|
|
pfsync_bulk_update(void *v)
|
|
{
|
|
struct pfsync_softc *sc = v;
|
|
int s, i = 0;
|
|
struct pf_state *state;
|
|
|
|
#ifdef __FreeBSD__
|
|
PF_LOCK();
|
|
#endif
|
|
s = splnet();
|
|
if (sc->sc_mbuf != NULL)
|
|
pfsync_sendout(sc);
|
|
|
|
/*
|
|
* Grab at most PFSYNC_BULKPACKETS worth of states which have not
|
|
* been sent since the latest request was made.
|
|
*/
|
|
while ((state = TAILQ_FIRST(&state_updates)) != NULL &&
|
|
++i < (sc->sc_maxcount * PFSYNC_BULKPACKETS)) {
|
|
if (state->pfsync_time > sc->sc_ureq_received) {
|
|
/* we're done */
|
|
pfsync_send_bus(sc, PFSYNC_BUS_END);
|
|
sc->sc_ureq_received = 0;
|
|
#ifdef __FreeBSD__
|
|
callout_stop(&sc->sc_bulk_tmo);
|
|
#else
|
|
timeout_del(&sc->sc_bulk_tmo);
|
|
#endif
|
|
if (pf_status.debug >= PF_DEBUG_MISC)
|
|
printf("pfsync: bulk update complete\n");
|
|
break;
|
|
} else {
|
|
/* send an update and move to end of list */
|
|
if (!state->sync_flags)
|
|
pfsync_pack_state(PFSYNC_ACT_UPD, state, 0);
|
|
state->pfsync_time = time_uptime;
|
|
TAILQ_REMOVE(&state_updates, state, u.s.entry_updates);
|
|
TAILQ_INSERT_TAIL(&state_updates, state,
|
|
u.s.entry_updates);
|
|
|
|
/* look again for more in a bit */
|
|
#ifdef __FreeBSD__
|
|
callout_reset(&sc->sc_bulk_tmo, 1, pfsync_timeout,
|
|
LIST_FIRST(&pfsync_list));
|
|
#else
|
|
timeout_add(&sc->sc_bulk_tmo, 1);
|
|
#endif
|
|
}
|
|
}
|
|
if (sc->sc_mbuf != NULL)
|
|
pfsync_sendout(sc);
|
|
splx(s);
|
|
#ifdef __FreeBSD__
|
|
PF_UNLOCK();
|
|
#endif
|
|
}
|
|
|
|
void
|
|
pfsync_bulkfail(void *v)
|
|
{
|
|
struct pfsync_softc *sc = v;
|
|
int s, error;
|
|
|
|
#ifdef __FreeBSD__
|
|
PF_LOCK();
|
|
#endif
|
|
if (sc->sc_bulk_tries++ < PFSYNC_MAX_BULKTRIES) {
|
|
/* Try again in a bit */
|
|
#ifdef __FreeBSD__
|
|
callout_reset(&sc->sc_bulkfail_tmo, 5 * hz, pfsync_bulkfail,
|
|
LIST_FIRST(&pfsync_list));
|
|
#else
|
|
timeout_add(&sc->sc_bulkfail_tmo, 5 * hz);
|
|
#endif
|
|
s = splnet();
|
|
error = pfsync_request_update(NULL, NULL);
|
|
if (error == ENOMEM) {
|
|
if (pf_status.debug >= PF_DEBUG_MISC)
|
|
printf("pfsync: cannot allocate mbufs for "
|
|
"bulk update\n");
|
|
} else
|
|
pfsync_sendout(sc);
|
|
splx(s);
|
|
} else {
|
|
/* Pretend like the transfer was ok */
|
|
sc->sc_ureq_sent = 0;
|
|
sc->sc_bulk_tries = 0;
|
|
#if NCARP > 0
|
|
if (!pfsync_sync_ok)
|
|
carp_suppress_preempt--;
|
|
#endif
|
|
pfsync_sync_ok = 1;
|
|
if (pf_status.debug >= PF_DEBUG_MISC)
|
|
printf("pfsync: failed to receive "
|
|
"bulk update status\n");
|
|
#ifdef __FreeBSD__
|
|
callout_stop(&sc->sc_bulkfail_tmo);
|
|
#else
|
|
timeout_del(&sc->sc_bulkfail_tmo);
|
|
#endif
|
|
}
|
|
#ifdef __FreeBSD__
|
|
PF_UNLOCK();
|
|
#endif
|
|
}
|
|
|
|
/* This must be called in splnet() */
|
|
int
|
|
pfsync_sendout(sc)
|
|
struct pfsync_softc *sc;
|
|
{
|
|
#if NBPFILTER > 0
|
|
# ifdef __FreeBSD__
|
|
struct ifnet *ifp = SCP2IFP(sc);
|
|
# else
|
|
struct ifnet *ifp = &sc->if_sc;
|
|
# endif
|
|
#endif
|
|
struct mbuf *m;
|
|
|
|
#ifdef __FreeBSD__
|
|
PF_ASSERT(MA_OWNED);
|
|
callout_stop(&sc->sc_tmo);
|
|
#else
|
|
timeout_del(&sc->sc_tmo);
|
|
#endif
|
|
|
|
if (sc->sc_mbuf == NULL)
|
|
return (0);
|
|
m = sc->sc_mbuf;
|
|
sc->sc_mbuf = NULL;
|
|
sc->sc_statep.s = NULL;
|
|
|
|
#ifdef __FreeBSD__
|
|
KASSERT(m != NULL, ("pfsync_sendout: null mbuf"));
|
|
#endif
|
|
#if NBPFILTER > 0
|
|
if (ifp->if_bpf)
|
|
bpf_mtap(ifp->if_bpf, m);
|
|
#endif
|
|
|
|
if (sc->sc_mbuf_net) {
|
|
m_freem(m);
|
|
m = sc->sc_mbuf_net;
|
|
sc->sc_mbuf_net = NULL;
|
|
sc->sc_statep_net.s = NULL;
|
|
}
|
|
|
|
if (sc->sc_sync_ifp || sc->sc_sync_peer.s_addr != INADDR_PFSYNC_GROUP) {
|
|
struct ip *ip;
|
|
struct sockaddr sa;
|
|
|
|
M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
|
|
if (m == NULL) {
|
|
pfsyncstats.pfsyncs_onomem++;
|
|
return (0);
|
|
}
|
|
ip = mtod(m, struct ip *);
|
|
ip->ip_v = IPVERSION;
|
|
ip->ip_hl = sizeof(*ip) >> 2;
|
|
ip->ip_tos = IPTOS_LOWDELAY;
|
|
#ifdef __FreeBSD__
|
|
ip->ip_len = m->m_pkthdr.len;
|
|
#else
|
|
ip->ip_len = htons(m->m_pkthdr.len);
|
|
#endif
|
|
ip->ip_id = htons(ip_randomid());
|
|
#ifdef __FreeBSD__
|
|
ip->ip_off = IP_DF;
|
|
#else
|
|
ip->ip_off = htons(IP_DF);
|
|
#endif
|
|
ip->ip_ttl = PFSYNC_DFLTTL;
|
|
ip->ip_p = IPPROTO_PFSYNC;
|
|
ip->ip_sum = 0;
|
|
|
|
bzero(&sa, sizeof(sa));
|
|
ip->ip_src.s_addr = INADDR_ANY;
|
|
|
|
#ifdef __FreeBSD__
|
|
if (sc->sc_sendaddr.s_addr == htonl(INADDR_PFSYNC_GROUP))
|
|
#else
|
|
if (sc->sc_sendaddr.s_addr == INADDR_PFSYNC_GROUP)
|
|
#endif
|
|
m->m_flags |= M_MCAST;
|
|
ip->ip_dst = sc->sc_sendaddr;
|
|
#ifdef __FreeBSD__
|
|
/* XXX_IMPORT */
|
|
sc->sc_sendaddr.s_addr = htonl(sc->sc_sync_peer.s_addr);
|
|
#else
|
|
sc->sc_sendaddr.s_addr = sc->sc_sync_peer.s_addr;
|
|
#endif
|
|
|
|
pfsyncstats.pfsyncs_opackets++;
|
|
#ifdef __FreeBSD__
|
|
if (!IF_HANDOFF(&sc->sc_ifq, m, NULL))
|
|
pfsyncstats.pfsyncs_oerrors++;
|
|
callout_reset(&sc->sc_send_tmo, 1, pfsync_senddef, sc);
|
|
#else
|
|
if (ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo, NULL))
|
|
pfsyncstats.pfsyncs_oerrors++;
|
|
#endif
|
|
} else
|
|
m_freem(m);
|
|
|
|
return (0);
|
|
}
|
|
|
|
#ifdef __FreeBSD__
|
|
static void
|
|
pfsync_senddef(void *arg)
|
|
{
|
|
struct pfsync_softc *sc = (struct pfsync_softc *)arg;
|
|
struct mbuf *m;
|
|
|
|
for(;;) {
|
|
IF_DEQUEUE(&sc->sc_ifq, m);
|
|
if (m == NULL)
|
|
break;
|
|
if (ip_output(m, NULL, NULL, IP_RAWOUTPUT, &sc->sc_imo, NULL))
|
|
pfsyncstats.pfsyncs_oerrors++;
|
|
}
|
|
}
|
|
|
|
static int
|
|
pfsync_modevent(module_t mod, int type, void *data)
|
|
{
|
|
int error = 0;
|
|
|
|
switch (type) {
|
|
case MOD_LOAD:
|
|
LIST_INIT(&pfsync_list);
|
|
if_clone_attach(&pfsync_cloner);
|
|
break;
|
|
|
|
case MOD_UNLOAD:
|
|
if_clone_detach(&pfsync_cloner);
|
|
while (!LIST_EMPTY(&pfsync_list))
|
|
pfsync_clone_destroy(
|
|
SCP2IFP(LIST_FIRST(&pfsync_list)));
|
|
break;
|
|
|
|
default:
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
static moduledata_t pfsync_mod = {
|
|
"pfsync",
|
|
pfsync_modevent,
|
|
0
|
|
};
|
|
|
|
#define PFSYNC_MODVER 1
|
|
|
|
DECLARE_MODULE(pfsync, pfsync_mod, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY);
|
|
MODULE_VERSION(pfsync, PFSYNC_MODVER);
|
|
#endif /* __FreeBSD__ */
|