1662 lines
34 KiB
C
1662 lines
34 KiB
C
/* $NetBSD: ip_fil_netbsd.c,v 1.16 2004/09/06 10:46:02 yamt Exp $ */
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/*
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* Copyright (C) 1993-2003 by Darren Reed.
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*
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* See the IPFILTER.LICENCE file for details on licencing.
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*/
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#if !defined(lint)
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static const char sccsid[] = "@(#)ip_fil.c 2.41 6/5/96 (C) 1993-2000 Darren Reed";
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static const char rcsid[] = "@(#)Id: ip_fil_netbsd.c,v 2.55.2.12 2004/07/06 11:15:50 darrenr Exp";
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#endif
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#if defined(KERNEL) || defined(_KERNEL)
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# undef KERNEL
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# undef _KERNEL
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# define KERNEL 1
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# define _KERNEL 1
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#endif
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#include <sys/param.h>
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#if (NetBSD >= 199905) && !defined(IPFILTER_LKM) && defined(_KERNEL)
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# include "opt_ipfilter_log.h"
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# include "opt_pfil_hooks.h"
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# include "opt_ipsec.h"
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#endif
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#include <sys/errno.h>
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#include <sys/types.h>
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#include <sys/file.h>
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#include <sys/ioctl.h>
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#include <sys/time.h>
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#include <sys/systm.h>
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#if (NetBSD > 199609)
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# include <sys/dirent.h>
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#else
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# include <sys/dir.h>
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#endif
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#include <sys/mbuf.h>
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#include <sys/protosw.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include <net/route.h>
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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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#include <netinet/ip_var.h>
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#include <netinet/tcp.h>
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#include <netinet/udp.h>
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#include <netinet/tcpip.h>
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#include <netinet/ip_icmp.h>
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#include "netinet/ip_compat.h"
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#ifdef USE_INET6
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# include <netinet/icmp6.h>
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# if (__NetBSD_Version__ >= 106000000)
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# include <netinet6/nd6.h>
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# endif
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#endif
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#include "netinet/ip_fil.h"
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#include "netinet/ip_nat.h"
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#include "netinet/ip_frag.h"
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#include "netinet/ip_state.h"
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#include "netinet/ip_proxy.h"
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#include "netinet/ip_auth.h"
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#ifdef IPFILTER_SYNC
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#include "netinet/ip_sync.h"
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#endif
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#ifdef IPFILTER_SCAN
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#include "netinet/ip_scan.h"
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#endif
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#include "netinet/ip_pool.h"
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#include <sys/md5.h>
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#include <sys/kernel.h>
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extern int ip_optcopy __P((struct ip *, struct ip *));
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#ifdef IPFILTER_M_IPFILTER
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MALLOC_DEFINE(M_IPFILTER, "IP Filter", "IP Filter packet filter data structures");
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#endif
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#if __NetBSD_Version__ >= 105009999
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# define csuminfo csum_flags
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#endif
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static int (*fr_savep) __P((ip_t *, int, void *, int, struct mbuf **));
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static int fr_send_ip __P((fr_info_t *, mb_t *, mb_t **));
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#ifdef KMUTEX_T
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extern ipfmutex_t ipf_rw;
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extern ipfrwlock_t ipf_mutex;
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#endif
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#ifdef USE_INET6
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static int ipfr_fastroute6 __P((struct mbuf *, struct mbuf **,
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fr_info_t *, frdest_t *));
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#endif
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#if (__NetBSD_Version__ >= 104040000)
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# include <sys/callout.h>
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struct callout fr_slowtimer_ch;
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#endif
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#include <sys/conf.h>
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#if defined(NETBSD_PF)
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# include <net/pfil.h>
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/*
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* We provide the fr_checkp name just to minimize changes later.
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*/
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int (*fr_checkp) __P((ip_t *ip, int hlen, void *ifp, int out, mb_t **mp));
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#endif /* NETBSD_PF */
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#if (__NetBSD_Version__ >= 106080000) && defined(_KERNEL)
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const struct cdevsw ipl_cdevsw = {
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iplopen, iplclose, iplread, nowrite, iplioctl,
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nostop, notty, nopoll, nommap,
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};
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#endif
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#if defined(__NetBSD_Version__) && (__NetBSD_Version__ >= 105110000)
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# include <net/pfil.h>
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static int fr_check_wrapper(void *, struct mbuf **, struct ifnet *, int );
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static int fr_check_wrapper(arg, mp, ifp, dir)
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void *arg;
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struct mbuf **mp;
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struct ifnet *ifp;
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int dir;
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{
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struct ip *ip;
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int rv, hlen;
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int error;
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/*
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* ensure that mbufs are writable beforehand
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* as it's assumed by ipf code.
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* XXX inefficient
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*/
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error = m_makewritable(mp, 0, M_COPYALL, M_DONTWAIT);
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if (error) {
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m_freem(*mp);
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*mp = NULL;
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return error;
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}
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#if defined(M_CSUM_TCPv4)
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/*
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* If the packet is out-bound, we can't delay checksums
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* here. For in-bound, the checksum has already been
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* validated.
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*/
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if (dir == PFIL_OUT) {
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if ((*mp)->m_pkthdr.csum_flags & (M_CSUM_TCPv4|M_CSUM_UDPv4)) {
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in_delayed_cksum(*mp);
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(*mp)->m_pkthdr.csum_flags &=
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~(M_CSUM_TCPv4|M_CSUM_UDPv4);
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}
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}
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#endif /* M_CSUM_TCPv4 */
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ip = mtod(*mp, struct ip *);
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hlen = ip->ip_hl << 2;
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/*
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* We get the packet with all fields in network byte
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* order. We expect ip_len and ip_off to be in host
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* order. We frob them, call the filter, then frob
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* them back.
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*
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* Note, we don't need to update the checksum, because
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* it has already been verified.
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*/
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NTOHS(ip->ip_len);
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NTOHS(ip->ip_off);
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rv = fr_check(ip, hlen, ifp, (dir == PFIL_OUT), mp);
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if (rv == 0 && *mp != NULL) {
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ip = mtod(*mp, struct ip *);
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HTONS(ip->ip_len);
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HTONS(ip->ip_off);
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}
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return (rv);
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}
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# ifdef USE_INET6
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# include <netinet/ip6.h>
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static int fr_check_wrapper6(void *, struct mbuf **, struct ifnet *, int );
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static int fr_check_wrapper6(arg, mp, ifp, dir)
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void *arg;
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struct mbuf **mp;
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struct ifnet *ifp;
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int dir;
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{
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int error;
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/*
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* ensure that mbufs are writable beforehand
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* as it's assumed by ipf code.
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* XXX inefficient
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*/
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error = m_makewritable(mp, 0, M_COPYALL, M_DONTWAIT);
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if (error) {
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m_freem(*mp);
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*mp = NULL;
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return error;
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}
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return (fr_check(mtod(*mp, struct ip *), sizeof(struct ip6_hdr),
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ifp, (dir == PFIL_OUT), mp));
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}
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# endif
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#endif /* __NetBSD_Version >= 105110000 */
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#if defined(IPFILTER_LKM)
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int iplidentify(s)
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char *s;
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{
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if (strcmp(s, "ipl") == 0)
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return 1;
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return 0;
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}
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#endif /* IPFILTER_LKM */
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/*
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* Try to detect the case when compiling for NetBSD with pseudo-device
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*/
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#if defined(PFIL_HOOKS)
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void
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ipfilterattach(count)
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int count;
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{
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# if 0
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if (iplattach() != 0)
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printf("IP Filter failed to attach\n");
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# endif
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}
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#endif
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int iplattach()
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{
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int s;
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#if defined(NETBSD_PF) && (__NetBSD_Version__ >= 104200000)
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int error = 0;
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# if defined(__NetBSD_Version__) && (__NetBSD_Version__ >= 105110000)
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struct pfil_head *ph_inet;
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# ifdef USE_INET6
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struct pfil_head *ph_inet6;
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# endif
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# endif
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#endif
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SPL_NET(s);
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if ((fr_running > 0) || (fr_checkp == fr_check)) {
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printf("IP Filter: already initialized\n");
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SPL_X(s);
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return EBUSY;
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}
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if (fr_initialise() < 0) {
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SPL_X(s);
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return EIO;
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}
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#ifdef NETBSD_PF
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# if (__NetBSD_Version__ >= 104200000)
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# if __NetBSD_Version__ >= 105110000
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ph_inet = pfil_head_get(PFIL_TYPE_AF, AF_INET);
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# ifdef USE_INET6
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ph_inet6 = pfil_head_get(PFIL_TYPE_AF, AF_INET6);
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# endif
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if (ph_inet == NULL
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# ifdef USE_INET6
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&& ph_inet6 == NULL
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# endif
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) {
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printf("pfil_head_get failed\n");
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return ENODEV;
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}
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if (ph_inet != NULL)
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error = pfil_add_hook((void *)fr_check_wrapper, NULL,
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PFIL_IN|PFIL_OUT, ph_inet);
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else
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error = 0;
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# else
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error = pfil_add_hook((void *)fr_check, PFIL_IN|PFIL_OUT,
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&inetsw[ip_protox[IPPROTO_IP]].pr_pfh);
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# endif
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if (error) {
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# ifdef USE_INET6
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goto pfil_error;
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# else
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fr_deinitialise();
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SPL_X(s);
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return error;
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# endif
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}
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# else
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pfil_add_hook((void *)fr_check, PFIL_IN|PFIL_OUT);
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# endif
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# ifdef USE_INET6
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# if __NetBSD_Version__ >= 105110000
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if (ph_inet6 != NULL)
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error = pfil_add_hook((void *)fr_check_wrapper6, NULL,
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PFIL_IN|PFIL_OUT, ph_inet6);
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else
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error = 0;
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if (error) {
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pfil_remove_hook((void *)fr_check_wrapper6, NULL,
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PFIL_IN|PFIL_OUT, ph_inet6);
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# else
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error = pfil_add_hook((void *)fr_check, PFIL_IN|PFIL_OUT,
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&inetsw[ip_protox[IPPROTO_IPV6]].pr_pfh);
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if (error) {
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pfil_remove_hook((void *)fr_check, PFIL_IN|PFIL_OUT,
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&inetsw[ip_protox[IPPROTO_IP]].pr_pfh);
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# endif
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pfil_error:
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fr_deinitialise();
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SPL_X(s);
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return error;
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}
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# endif
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#endif
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bzero((char *)frcache, sizeof(frcache));
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fr_savep = fr_checkp;
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fr_checkp = fr_check;
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if (fr_control_forwarding & 1)
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ipforwarding = 1;
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SPL_X(s);
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#if (__NetBSD_Version__ >= 104010000)
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callout_init(&fr_slowtimer_ch);
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callout_reset(&fr_slowtimer_ch, (hz / IPF_HZ_DIVIDE) * IPF_HZ_MULT,
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fr_slowtimer, NULL);
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#else
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timeout(fr_slowtimer, NULL, (hz / IPF_HZ_DIVIDE) * IPF_HZ_MULT);
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#endif
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return 0;
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}
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/*
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* Disable the filter by removing the hooks from the IP input/output
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* stream.
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*/
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int ipldetach()
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{
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int s;
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#if defined(NETBSD_PF) && (__NetBSD_Version__ >= 104200000)
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int error = 0;
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# if __NetBSD_Version__ >= 105150000
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struct pfil_head *ph_inet = pfil_head_get(PFIL_TYPE_AF, AF_INET);
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# ifdef USE_INET6
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struct pfil_head *ph_inet6 = pfil_head_get(PFIL_TYPE_AF, AF_INET6);
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# endif
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# endif
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#endif
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SPL_NET(s);
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#if (__NetBSD_Version__ >= 104010000)
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callout_stop(&fr_slowtimer_ch);
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#else
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untimeout(fr_slowtimer, NULL);
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#endif /* NetBSD */
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fr_checkp = fr_savep;
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(void) frflush(IPL_LOGIPF, 0, FR_INQUE|FR_OUTQUE|FR_INACTIVE);
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(void) frflush(IPL_LOGIPF, 0, FR_INQUE|FR_OUTQUE);
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if (fr_control_forwarding & 2)
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ipforwarding = 0;
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#ifdef NETBSD_PF
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# if (__NetBSD_Version__ >= 104200000)
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# if __NetBSD_Version__ >= 105110000
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if (ph_inet != NULL)
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error = pfil_remove_hook((void *)fr_check_wrapper, NULL,
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PFIL_IN|PFIL_OUT, ph_inet);
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else
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error = 0;
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# else
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error = pfil_remove_hook((void *)fr_check, PFIL_IN|PFIL_OUT,
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&inetsw[ip_protox[IPPROTO_IP]].pr_pfh);
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# endif
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if (error)
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return error;
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# else
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pfil_remove_hook((void *)fr_check, PFIL_IN|PFIL_OUT);
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# endif
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# ifdef USE_INET6
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# if __NetBSD_Version__ >= 105110000
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if (ph_inet6 != NULL)
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error = pfil_remove_hook((void *)fr_check_wrapper6, NULL,
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PFIL_IN|PFIL_OUT, ph_inet6);
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else
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error = 0;
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# else
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error = pfil_remove_hook((void *)fr_check, PFIL_IN|PFIL_OUT,
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&inetsw[ip_protox[IPPROTO_IPV6]].pr_pfh);
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# endif
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if (error)
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return error;
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# endif
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#endif
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fr_deinitialise();
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SPL_X(s);
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return 0;
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}
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/*
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* Filter ioctl interface.
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*/
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int iplioctl(dev, cmd, data, mode
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#if (NetBSD >= 199511)
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, p)
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struct proc *p;
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#else
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)
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#endif
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dev_t dev;
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u_long cmd;
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caddr_t data;
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int mode;
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{
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int s;
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int error = 0, unit = 0, tmp;
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friostat_t fio;
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if ((securelevel >= 2) && (mode & FWRITE))
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return EPERM;
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unit = GET_MINOR(dev);
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if ((IPL_LOGMAX < unit) || (unit < 0))
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return ENXIO;
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if (fr_running <= 0) {
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if (unit != IPL_LOGIPF)
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return EIO;
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if (cmd != SIOCIPFGETNEXT && cmd != SIOCIPFGET &&
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cmd != SIOCIPFSET && cmd != SIOCFRENB &&
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cmd != SIOCGETFS && cmd != SIOCGETFF)
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return EIO;
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}
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SPL_NET(s);
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error = fr_ioctlswitch(unit, data, cmd, mode);
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if (error != -1) {
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SPL_X(s);
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return error;
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}
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error = 0;
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switch (cmd)
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{
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case FIONREAD :
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#ifdef IPFILTER_LOG
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BCOPYOUT(&iplused[IPL_LOGIPF], (caddr_t)data,
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sizeof(iplused[IPL_LOGIPF]));
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#endif
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break;
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case SIOCFRENB :
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if (!(mode & FWRITE))
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error = EPERM;
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else {
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BCOPYIN(data, &tmp, sizeof(tmp));
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if (tmp) {
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if (fr_running > 0)
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error = 0;
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else
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error = iplattach();
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if (error == 0)
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fr_running = 1;
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else
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(void) ipldetach();
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} else {
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error = ipldetach();
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if (error == 0)
|
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fr_running = -1;
|
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}
|
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}
|
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break;
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case SIOCIPFSET :
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if (!(mode & FWRITE)) {
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error = EPERM;
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break;
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}
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case SIOCIPFGETNEXT :
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case SIOCIPFGET :
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error = fr_ipftune(cmd, data);
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break;
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case SIOCSETFF :
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if (!(mode & FWRITE))
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error = EPERM;
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else
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BCOPYIN(data, &fr_flags, sizeof(fr_flags));
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break;
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case SIOCGETFF :
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BCOPYOUT(&fr_flags, data, sizeof(fr_flags));
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break;
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case SIOCFUNCL :
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error = fr_resolvefunc(data);
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break;
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case SIOCINAFR :
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case SIOCRMAFR :
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case SIOCADAFR :
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case SIOCZRLST :
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if (!(mode & FWRITE))
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error = EPERM;
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else
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error = frrequest(unit, cmd, data, fr_active, 1);
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break;
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case SIOCINIFR :
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case SIOCRMIFR :
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case SIOCADIFR :
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if (!(mode & FWRITE))
|
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error = EPERM;
|
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else
|
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error = frrequest(unit, cmd, data, 1 - fr_active, 1);
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break;
|
|
case SIOCSWAPA :
|
|
if (!(mode & FWRITE))
|
|
error = EPERM;
|
|
else {
|
|
bzero((char *)frcache, sizeof(frcache[0]) * 2);
|
|
*(u_int *)data = fr_active;
|
|
fr_active = 1 - fr_active;
|
|
}
|
|
break;
|
|
case SIOCGETFS :
|
|
fr_getstat(&fio);
|
|
error = fr_outobj(data, &fio, IPFOBJ_IPFSTAT);
|
|
break;
|
|
case SIOCFRZST :
|
|
if (!(mode & FWRITE))
|
|
error = EPERM;
|
|
else
|
|
error = fr_zerostats(data);
|
|
break;
|
|
case SIOCIPFFL :
|
|
if (!(mode & FWRITE))
|
|
error = EPERM;
|
|
else {
|
|
BCOPYIN(data, &tmp, sizeof(tmp));
|
|
tmp = frflush(unit, 4, tmp);
|
|
BCOPYOUT(&tmp, data, sizeof(tmp));
|
|
}
|
|
break;
|
|
#ifdef USE_INET6
|
|
case SIOCIPFL6 :
|
|
if (!(mode & FWRITE))
|
|
error = EPERM;
|
|
else {
|
|
BCOPYIN(data, &tmp, sizeof(tmp));
|
|
tmp = frflush(unit, 6, tmp);
|
|
BCOPYOUT(&tmp, data, sizeof(tmp));
|
|
}
|
|
break;
|
|
#endif
|
|
case SIOCSTLCK :
|
|
BCOPYIN(data, &tmp, sizeof(tmp));
|
|
fr_state_lock = tmp;
|
|
fr_nat_lock = tmp;
|
|
fr_frag_lock = tmp;
|
|
fr_auth_lock = tmp;
|
|
break;
|
|
#ifdef IPFILTER_LOG
|
|
case SIOCIPFFB :
|
|
if (!(mode & FWRITE))
|
|
error = EPERM;
|
|
else
|
|
*(int *)data = ipflog_clear(unit);
|
|
break;
|
|
#endif /* IPFILTER_LOG */
|
|
case SIOCGFRST :
|
|
error = fr_outobj(data, fr_fragstats(), IPFOBJ_FRAGSTAT);
|
|
break;
|
|
case SIOCFRSYN :
|
|
if (!(mode & FWRITE))
|
|
error = EPERM;
|
|
else {
|
|
frsync();
|
|
}
|
|
break;
|
|
default :
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
SPL_X(s);
|
|
return error;
|
|
}
|
|
|
|
|
|
void fr_forgetifp(ifp)
|
|
void *ifp;
|
|
{
|
|
register frentry_t *f;
|
|
|
|
WRITE_ENTER(&ipf_mutex);
|
|
for (f = ipacct[0][fr_active]; (f != NULL); f = f->fr_next)
|
|
if (f->fr_ifa == ifp)
|
|
f->fr_ifa = (void *)-1;
|
|
for (f = ipacct[1][fr_active]; (f != NULL); f = f->fr_next)
|
|
if (f->fr_ifa == ifp)
|
|
f->fr_ifa = (void *)-1;
|
|
for (f = ipfilter[0][fr_active]; (f != NULL); f = f->fr_next)
|
|
if (f->fr_ifa == ifp)
|
|
f->fr_ifa = (void *)-1;
|
|
for (f = ipfilter[1][fr_active]; (f != NULL); f = f->fr_next)
|
|
if (f->fr_ifa == ifp)
|
|
f->fr_ifa = (void *)-1;
|
|
#ifdef USE_INET6
|
|
for (f = ipacct6[0][fr_active]; (f != NULL); f = f->fr_next)
|
|
if (f->fr_ifa == ifp)
|
|
f->fr_ifa = (void *)-1;
|
|
for (f = ipacct6[1][fr_active]; (f != NULL); f = f->fr_next)
|
|
if (f->fr_ifa == ifp)
|
|
f->fr_ifa = (void *)-1;
|
|
for (f = ipfilter6[0][fr_active]; (f != NULL); f = f->fr_next)
|
|
if (f->fr_ifa == ifp)
|
|
f->fr_ifa = (void *)-1;
|
|
for (f = ipfilter6[1][fr_active]; (f != NULL); f = f->fr_next)
|
|
if (f->fr_ifa == ifp)
|
|
f->fr_ifa = (void *)-1;
|
|
#endif
|
|
RWLOCK_EXIT(&ipf_mutex);
|
|
fr_natsync(ifp);
|
|
}
|
|
|
|
|
|
/*
|
|
* routines below for saving IP headers to buffer
|
|
*/
|
|
int iplopen(dev, flags
|
|
#if (NetBSD >= 199511)
|
|
, devtype, p)
|
|
int devtype;
|
|
struct proc *p;
|
|
#else
|
|
)
|
|
#endif
|
|
dev_t dev;
|
|
int flags;
|
|
{
|
|
u_int min = GET_MINOR(dev);
|
|
|
|
if (IPL_LOGMAX < min)
|
|
min = ENXIO;
|
|
else
|
|
min = 0;
|
|
return min;
|
|
}
|
|
|
|
|
|
int iplclose(dev, flags
|
|
#if (NetBSD >= 199511)
|
|
, devtype, p)
|
|
int devtype;
|
|
struct proc *p;
|
|
#else
|
|
)
|
|
#endif
|
|
dev_t dev;
|
|
int flags;
|
|
{
|
|
u_int min = GET_MINOR(dev);
|
|
|
|
if (IPL_LOGMAX < min)
|
|
min = ENXIO;
|
|
else
|
|
min = 0;
|
|
return min;
|
|
}
|
|
|
|
/*
|
|
* iplread/ipllog
|
|
* both of these must operate with at least splnet() lest they be
|
|
* called during packet processing and cause an inconsistancy to appear in
|
|
* the filter lists.
|
|
*/
|
|
#if (BSD >= 199306)
|
|
int iplread(dev, uio, ioflag)
|
|
int ioflag;
|
|
#else
|
|
int iplread(dev, uio)
|
|
#endif
|
|
dev_t dev;
|
|
register struct uio *uio;
|
|
{
|
|
#ifdef IPFILTER_LOG
|
|
return ipflog_read(GET_MINOR(dev), uio);
|
|
#else
|
|
return ENXIO;
|
|
#endif
|
|
}
|
|
|
|
|
|
/*
|
|
* fr_send_reset - this could conceivably be a call to tcp_respond(), but that
|
|
* requires a large amount of setting up and isn't any more efficient.
|
|
*/
|
|
int fr_send_reset(fin)
|
|
fr_info_t *fin;
|
|
{
|
|
struct tcphdr *tcp, *tcp2;
|
|
int tlen = 0, hlen;
|
|
struct mbuf *m;
|
|
#ifdef USE_INET6
|
|
ip6_t *ip6;
|
|
#endif
|
|
ip_t *ip;
|
|
|
|
tcp = fin->fin_dp;
|
|
if (tcp->th_flags & TH_RST)
|
|
return -1; /* feedback loop */
|
|
|
|
#ifndef IPFILTER_CKSUM
|
|
if (fr_checkl4sum(fin) == -1)
|
|
return -1;
|
|
#endif
|
|
|
|
tlen = fin->fin_dlen - (TCP_OFF(tcp) << 2) +
|
|
((tcp->th_flags & TH_SYN) ? 1 : 0) +
|
|
((tcp->th_flags & TH_FIN) ? 1 : 0);
|
|
|
|
#ifdef USE_INET6
|
|
hlen = (fin->fin_v == 6) ? sizeof(ip6_t) : sizeof(ip_t);
|
|
#else
|
|
hlen = sizeof(ip_t);
|
|
#endif
|
|
#ifdef MGETHDR
|
|
MGETHDR(m, M_DONTWAIT, MT_HEADER);
|
|
#else
|
|
MGET(m, M_DONTWAIT, MT_HEADER);
|
|
#endif
|
|
if (m == NULL)
|
|
return -1;
|
|
if (sizeof(*tcp2) + hlen > MHLEN) {
|
|
MCLGET(m, M_DONTWAIT);
|
|
if (m == NULL)
|
|
return -1;
|
|
if ((m->m_flags & M_EXT) == 0) {
|
|
FREE_MB_T(m);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
m->m_len = sizeof(*tcp2) + hlen;
|
|
m->m_data += max_linkhdr;
|
|
m->m_pkthdr.len = m->m_len;
|
|
m->m_pkthdr.rcvif = (struct ifnet *)0;
|
|
ip = mtod(m, struct ip *);
|
|
#ifdef USE_INET6
|
|
ip6 = (ip6_t *)ip;
|
|
#endif
|
|
bzero((char *)ip, sizeof(*tcp2) + hlen);
|
|
tcp2 = (struct tcphdr *)((char *)ip + hlen);
|
|
tcp2->th_sport = tcp->th_dport;
|
|
tcp2->th_dport = tcp->th_sport;
|
|
|
|
if (tcp->th_flags & TH_ACK) {
|
|
tcp2->th_seq = tcp->th_ack;
|
|
tcp2->th_flags = TH_RST;
|
|
tcp2->th_ack = 0;
|
|
} else {
|
|
tcp2->th_seq = 0;
|
|
tcp2->th_ack = ntohl(tcp->th_seq);
|
|
tcp2->th_ack += tlen;
|
|
tcp2->th_ack = htonl(tcp2->th_ack);
|
|
tcp2->th_flags = TH_RST|TH_ACK;
|
|
}
|
|
tcp2->th_x2 = 0;
|
|
TCP_OFF_A(tcp2, sizeof(*tcp2) >> 2);
|
|
tcp2->th_win = tcp->th_win;
|
|
tcp2->th_sum = 0;
|
|
tcp2->th_urp = 0;
|
|
|
|
#ifdef USE_INET6
|
|
if (fin->fin_v == 6) {
|
|
ip6->ip6_flow = 0;
|
|
ip6->ip6_plen = htons(sizeof(struct tcphdr));
|
|
ip6->ip6_nxt = IPPROTO_TCP;
|
|
ip6->ip6_hlim = 0;
|
|
ip6->ip6_src = fin->fin_dst6;
|
|
ip6->ip6_dst = fin->fin_src6;
|
|
tcp2->th_sum = in6_cksum(m, IPPROTO_TCP,
|
|
sizeof(*ip6), sizeof(*tcp2));
|
|
return fr_send_ip(fin, m, &m);
|
|
}
|
|
#endif
|
|
ip->ip_p = IPPROTO_TCP;
|
|
ip->ip_len = htons(sizeof(struct tcphdr));
|
|
ip->ip_src.s_addr = fin->fin_daddr;
|
|
ip->ip_dst.s_addr = fin->fin_saddr;
|
|
tcp2->th_sum = in_cksum(m, hlen + sizeof(*tcp2));
|
|
ip->ip_len = hlen + sizeof(*tcp2);
|
|
return fr_send_ip(fin, m, &m);
|
|
}
|
|
|
|
|
|
static int fr_send_ip(fin, m, mpp)
|
|
fr_info_t *fin;
|
|
mb_t *m, **mpp;
|
|
{
|
|
ip_t *ip, *oip;
|
|
|
|
ip = mtod(m, ip_t *);
|
|
|
|
IP_V_A(ip, fin->fin_v);
|
|
switch (fin->fin_v)
|
|
{
|
|
case 4 :
|
|
oip = fin->fin_ip;
|
|
IP_HL_A(ip, sizeof(*oip) >> 2);
|
|
ip->ip_tos = oip->ip_tos;
|
|
ip->ip_id = fr_nextipid(fin);
|
|
ip->ip_off = ip_mtudisc ? IP_DF : 0;
|
|
ip->ip_ttl = ip_defttl;
|
|
ip->ip_sum = 0;
|
|
break;
|
|
#ifdef USE_INET6
|
|
case 6 :
|
|
{
|
|
ip6_t *ip6 = (ip6_t *)ip;
|
|
|
|
ip6->ip6_vfc = 0x60;
|
|
ip6->ip6_hlim = IPDEFTTL;
|
|
|
|
break;
|
|
}
|
|
#endif
|
|
default :
|
|
return EINVAL;
|
|
}
|
|
#ifdef IPSEC
|
|
m->m_pkthdr.rcvif = NULL;
|
|
#endif
|
|
return fr_fastroute(m, mpp, fin, NULL);
|
|
}
|
|
|
|
|
|
int fr_send_icmp_err(type, fin, dst)
|
|
int type;
|
|
fr_info_t *fin;
|
|
int dst;
|
|
{
|
|
int err, hlen, xtra, iclen, ohlen, avail, code;
|
|
struct in_addr dst4;
|
|
struct icmp *icmp;
|
|
struct mbuf *m;
|
|
void *ifp;
|
|
#ifdef USE_INET6
|
|
ip6_t *ip6, *ip62;
|
|
struct in6_addr dst6;
|
|
#endif
|
|
ip_t *ip, *ip2;
|
|
|
|
if ((type < 0) || (type > ICMP_MAXTYPE))
|
|
return -1;
|
|
|
|
code = fin->fin_icode;
|
|
#ifdef USE_INET6
|
|
if ((code < 0) || (code > sizeof(icmptoicmp6unreach)/sizeof(int)))
|
|
return -1;
|
|
#endif
|
|
|
|
#ifndef IPFILTER_CKSUM
|
|
if (fr_checkl4sum(fin) == -1)
|
|
return -1;
|
|
#endif
|
|
#ifdef MGETHDR
|
|
MGETHDR(m, M_DONTWAIT, MT_HEADER);
|
|
#else
|
|
MGET(m, M_DONTWAIT, MT_HEADER);
|
|
#endif
|
|
if (m == NULL)
|
|
return -1;
|
|
avail = MHLEN;
|
|
|
|
|
|
xtra = 0;
|
|
hlen = 0;
|
|
ohlen = 0;
|
|
ifp = fin->fin_ifp;
|
|
if (fin->fin_v == 4) {
|
|
if ((fin->fin_p == IPPROTO_ICMP) &&
|
|
!(fin->fin_flx & FI_SHORT))
|
|
switch (ntohs(fin->fin_data[0]) >> 8)
|
|
{
|
|
case ICMP_ECHO :
|
|
case ICMP_TSTAMP :
|
|
case ICMP_IREQ :
|
|
case ICMP_MASKREQ :
|
|
break;
|
|
default :
|
|
return 0;
|
|
}
|
|
|
|
if (dst == 0) {
|
|
if (fr_ifpaddr(4, FRI_NORMAL, ifp,
|
|
&dst4, NULL) == -1) {
|
|
FREE_MB_T(m);
|
|
return -1;
|
|
}
|
|
} else
|
|
dst4.s_addr = fin->fin_daddr;
|
|
|
|
hlen = sizeof(ip_t);
|
|
ohlen = fin->fin_hlen;
|
|
if (fin->fin_hlen < fin->fin_plen)
|
|
xtra = MIN(fin->fin_dlen, 8);
|
|
else
|
|
xtra = 0;
|
|
}
|
|
|
|
#ifdef USE_INET6
|
|
else if (fin->fin_v == 6) {
|
|
hlen = sizeof(ip6_t);
|
|
ohlen = sizeof(ip6_t);
|
|
type = icmptoicmp6types[type];
|
|
if (type == ICMP6_DST_UNREACH)
|
|
code = icmptoicmp6unreach[code];
|
|
|
|
if (hlen + sizeof(*icmp) + max_linkhdr +
|
|
fin->fin_plen > avail) {
|
|
MCLGET(m, M_DONTWAIT);
|
|
if (m == NULL)
|
|
return -1;
|
|
if ((m->m_flags & M_EXT) == 0) {
|
|
FREE_MB_T(m);
|
|
return -1;
|
|
}
|
|
avail = MCLBYTES;
|
|
}
|
|
xtra = MIN(fin->fin_plen,
|
|
avail - hlen - sizeof(*icmp) - max_linkhdr);
|
|
if (dst == 0) {
|
|
if (fr_ifpaddr(6, FRI_NORMAL, ifp,
|
|
(struct in_addr *)&dst6, NULL) == -1) {
|
|
FREE_MB_T(m);
|
|
return -1;
|
|
}
|
|
} else
|
|
dst6 = fin->fin_dst6;
|
|
}
|
|
#endif
|
|
else
|
|
return -1;
|
|
|
|
iclen = hlen + sizeof(*icmp) + xtra;
|
|
avail -= (max_linkhdr + iclen);
|
|
m->m_data += max_linkhdr;
|
|
m->m_pkthdr.rcvif = (struct ifnet *)0;
|
|
if (xtra > avail)
|
|
xtra = avail;
|
|
iclen += xtra;
|
|
m->m_pkthdr.len = iclen;
|
|
if (avail < 0) {
|
|
FREE_MB_T(m);
|
|
return -1;
|
|
}
|
|
m->m_len = iclen;
|
|
ip = mtod(m, ip_t *);
|
|
icmp = (struct icmp *)((char *)ip + hlen);
|
|
ip2 = (ip_t *)&icmp->icmp_ip;
|
|
|
|
icmp->icmp_type = type;
|
|
icmp->icmp_code = fin->fin_icode;
|
|
icmp->icmp_cksum = 0;
|
|
#ifdef icmp_nextmtu
|
|
if (type == ICMP_UNREACH &&
|
|
fin->fin_icode == ICMP_UNREACH_NEEDFRAG && ifp)
|
|
icmp->icmp_nextmtu = htons(((struct ifnet *)ifp)->if_mtu);
|
|
#endif
|
|
|
|
bcopy((char *)fin->fin_ip, (char *)ip2, ohlen);
|
|
|
|
#if defined(M_CSUM_IPv4)
|
|
/*
|
|
* Clear any in-bound checksum flags for this packet.
|
|
*/
|
|
m->m_pkthdr.csuminfo = 0;
|
|
#endif /* __NetBSD__ && M_CSUM_IPv4 */
|
|
|
|
#ifdef USE_INET6
|
|
ip6 = (ip6_t *)ip;
|
|
if (fin->fin_v == 6) {
|
|
ip62 = (ip6_t *)ip2;
|
|
|
|
ip6->ip6_flow = 0;
|
|
ip6->ip6_plen = htons(iclen - hlen);
|
|
ip6->ip6_nxt = IPPROTO_ICMPV6;
|
|
ip6->ip6_hlim = 0;
|
|
ip6->ip6_src = dst6;
|
|
ip6->ip6_dst = fin->fin_src6;
|
|
if (xtra > 0)
|
|
bcopy((char *)fin->fin_ip + ohlen,
|
|
(char *)&icmp->icmp_ip + ohlen, xtra);
|
|
icmp->icmp_cksum = in6_cksum(m, IPPROTO_ICMPV6,
|
|
sizeof(*ip6), iclen - hlen);
|
|
} else
|
|
#endif
|
|
{
|
|
ip->ip_p = IPPROTO_ICMP;
|
|
ip->ip_src.s_addr = dst4.s_addr;
|
|
ip->ip_dst.s_addr = fin->fin_saddr;
|
|
|
|
if (xtra > 0)
|
|
bcopy((char *)fin->fin_ip + ohlen,
|
|
(char *)&icmp->icmp_ip + ohlen, xtra);
|
|
icmp->icmp_cksum = ipf_cksum((u_short *)icmp,
|
|
sizeof(*icmp) + 8);
|
|
ip->ip_len = iclen;
|
|
ip->ip_p = IPPROTO_ICMP;
|
|
}
|
|
err = fr_send_ip(fin, m, &m);
|
|
return err;
|
|
}
|
|
|
|
|
|
int fr_fastroute(m0, mpp, fin, fdp)
|
|
mb_t *m0, **mpp;
|
|
fr_info_t *fin;
|
|
frdest_t *fdp;
|
|
{
|
|
register struct ip *ip, *mhip;
|
|
register struct mbuf *m = m0;
|
|
register struct route *ro;
|
|
int len, off, error = 0, hlen, code;
|
|
struct ifnet *ifp, *sifp;
|
|
struct sockaddr_in *dst;
|
|
struct route iproute;
|
|
u_short ip_off;
|
|
frentry_t *fr;
|
|
|
|
#ifdef USE_INET6
|
|
if (fin->fin_v == 6) {
|
|
error = ipfr_fastroute6(m0, mpp, fin, fdp);
|
|
if ((error != 0) && (*mpp != NULL)) {
|
|
FREE_MB_T(*mpp);
|
|
*mpp = NULL;
|
|
}
|
|
return error;
|
|
}
|
|
#endif
|
|
|
|
hlen = fin->fin_hlen;
|
|
ip = mtod(m0, struct ip *);
|
|
|
|
#if defined(M_CSUM_IPv4)
|
|
/*
|
|
* Clear any in-bound checksum flags for this packet.
|
|
*/
|
|
m0->m_pkthdr.csuminfo = 0;
|
|
#endif /* __NetBSD__ && M_CSUM_IPv4 */
|
|
|
|
/*
|
|
* Route packet.
|
|
*/
|
|
ro = &iproute;
|
|
bzero((caddr_t)ro, sizeof (*ro));
|
|
dst = (struct sockaddr_in *)&ro->ro_dst;
|
|
dst->sin_family = AF_INET;
|
|
dst->sin_addr = ip->ip_dst;
|
|
|
|
fr = fin->fin_fr;
|
|
if (fdp != NULL)
|
|
ifp = fdp->fd_ifp;
|
|
else
|
|
ifp = fin->fin_ifp;
|
|
|
|
if ((ifp == NULL) && (!fr || !(fr->fr_flags & FR_FASTROUTE))) {
|
|
error = -2;
|
|
goto bad;
|
|
}
|
|
|
|
/*
|
|
* In case we're here due to "to <if>" being used with "keep state",
|
|
* check that we're going in the correct direction.
|
|
*/
|
|
if ((fr != NULL) && (fin->fin_rev != 0)) {
|
|
if ((ifp != NULL) && (fdp == &fr->fr_tif))
|
|
return 0;
|
|
} else if (fdp != NULL) {
|
|
if (fdp->fd_ip.s_addr != 0)
|
|
dst->sin_addr = fdp->fd_ip;
|
|
}
|
|
|
|
dst->sin_len = sizeof(*dst);
|
|
rtalloc(ro);
|
|
|
|
if ((ifp == NULL) && (ro->ro_rt != NULL))
|
|
ifp = ro->ro_rt->rt_ifp;
|
|
|
|
if ((ro->ro_rt == NULL) || (ifp == NULL)) {
|
|
if (in_localaddr(ip->ip_dst))
|
|
error = EHOSTUNREACH;
|
|
else
|
|
error = ENETUNREACH;
|
|
goto bad;
|
|
}
|
|
if (ro->ro_rt->rt_flags & RTF_GATEWAY)
|
|
dst = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
|
|
if (ro->ro_rt)
|
|
ro->ro_rt->rt_use++;
|
|
|
|
/*
|
|
* For input packets which are being "fastrouted", they won't
|
|
* go back through output filtering and miss their chance to get
|
|
* NAT'd and counted.
|
|
*/
|
|
if (fin->fin_out == 0) {
|
|
sifp = fin->fin_ifp;
|
|
fin->fin_ifp = ifp;
|
|
fin->fin_out = 1;
|
|
(void) fr_acctpkt(fin, NULL);
|
|
fin->fin_fr = NULL;
|
|
if (!fr || !(fr->fr_flags & FR_RETMASK)) {
|
|
u_32_t pass;
|
|
|
|
(void) fr_checkstate(fin, &pass);
|
|
}
|
|
|
|
switch (fr_checknatout(fin, NULL))
|
|
{
|
|
case 0 :
|
|
break;
|
|
case 1 :
|
|
ip->ip_sum = 0;
|
|
break;
|
|
case -1 :
|
|
error = -1;
|
|
goto done;
|
|
break;
|
|
}
|
|
|
|
fin->fin_ifp = sifp;
|
|
fin->fin_out = 0;
|
|
} else
|
|
ip->ip_sum = 0;
|
|
/*
|
|
* If small enough for interface, can just send directly.
|
|
*/
|
|
if (ip->ip_len <= ifp->if_mtu) {
|
|
ip->ip_len = htons(ip->ip_len);
|
|
ip->ip_off = htons(ip->ip_off);
|
|
#if defined(M_CSUM_IPv4)
|
|
if (ifp->if_capabilities & IFCAP_CSUM_IPv4)
|
|
m->m_pkthdr.csuminfo |= M_CSUM_IPv4;
|
|
else if (ip->ip_sum == 0)
|
|
ip->ip_sum = in_cksum(m, hlen);
|
|
#else
|
|
if (!ip->ip_sum)
|
|
ip->ip_sum = in_cksum(m, hlen);
|
|
#endif /* M_CSUM_IPv4 */
|
|
error = (*ifp->if_output)(ifp, m, (struct sockaddr *)dst,
|
|
ro->ro_rt);
|
|
goto done;
|
|
}
|
|
/*
|
|
* Too large for interface; fragment if possible.
|
|
* Must be able to put at least 8 bytes per fragment.
|
|
*/
|
|
ip_off = ip->ip_off;
|
|
if (ip_off & IP_DF) {
|
|
error = EMSGSIZE;
|
|
goto bad;
|
|
}
|
|
len = (ifp->if_mtu - hlen) &~ 7;
|
|
if (len < 8) {
|
|
error = EMSGSIZE;
|
|
goto bad;
|
|
}
|
|
|
|
{
|
|
int mhlen, firstlen = len;
|
|
struct mbuf **mnext = &m->m_act;
|
|
|
|
/*
|
|
* Loop through length of segment after first fragment,
|
|
* make new header and copy data of each part and link onto chain.
|
|
*/
|
|
m0 = m;
|
|
mhlen = sizeof (struct ip);
|
|
for (off = hlen + len; off < ip->ip_len; off += len) {
|
|
#ifdef MGETHDR
|
|
MGETHDR(m, M_DONTWAIT, MT_HEADER);
|
|
#else
|
|
MGET(m, M_DONTWAIT, MT_HEADER);
|
|
#endif
|
|
if (m == 0) {
|
|
m = m0;
|
|
error = ENOBUFS;
|
|
goto bad;
|
|
}
|
|
m->m_data += max_linkhdr;
|
|
mhip = mtod(m, struct ip *);
|
|
bcopy((char *)ip, (char *)mhip, sizeof(*ip));
|
|
if (hlen > sizeof (struct ip)) {
|
|
mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip);
|
|
IP_HL_A(mhip, mhlen >> 2);
|
|
}
|
|
m->m_len = mhlen;
|
|
mhip->ip_off = ((off - hlen) >> 3) + ip_off;
|
|
if (off + len >= ip->ip_len)
|
|
len = ip->ip_len - off;
|
|
else
|
|
mhip->ip_off |= IP_MF;
|
|
mhip->ip_len = htons((u_short)(len + mhlen));
|
|
m->m_next = m_copy(m0, off, len);
|
|
if (m->m_next == 0) {
|
|
error = ENOBUFS; /* ??? */
|
|
goto sendorfree;
|
|
}
|
|
m->m_pkthdr.len = mhlen + len;
|
|
m->m_pkthdr.rcvif = NULL;
|
|
mhip->ip_off = htons((u_short)mhip->ip_off);
|
|
mhip->ip_sum = 0;
|
|
mhip->ip_sum = in_cksum(m, mhlen);
|
|
*mnext = m;
|
|
mnext = &m->m_act;
|
|
}
|
|
/*
|
|
* Update first fragment by trimming what's been copied out
|
|
* and updating header, then send each fragment (in order).
|
|
*/
|
|
m_adj(m0, hlen + firstlen - ip->ip_len);
|
|
ip->ip_len = htons((u_short)(hlen + firstlen));
|
|
ip->ip_off = htons((u_short)IP_MF);
|
|
ip->ip_sum = 0;
|
|
ip->ip_sum = in_cksum(m0, hlen);
|
|
sendorfree:
|
|
for (m = m0; m; m = m0) {
|
|
m0 = m->m_act;
|
|
m->m_act = 0;
|
|
if (error == 0)
|
|
error = (*ifp->if_output)(ifp, m,
|
|
(struct sockaddr *)dst, ro->ro_rt);
|
|
else
|
|
FREE_MB_T(m);
|
|
}
|
|
}
|
|
done:
|
|
if (!error)
|
|
fr_frouteok[0]++;
|
|
else
|
|
fr_frouteok[1]++;
|
|
|
|
if (ro->ro_rt) {
|
|
RTFREE(ro->ro_rt);
|
|
}
|
|
*mpp = NULL;
|
|
return error;
|
|
bad:
|
|
if (error == EMSGSIZE) {
|
|
sifp = fin->fin_ifp;
|
|
code = fin->fin_icode;
|
|
fin->fin_icode = ICMP_UNREACH_NEEDFRAG;
|
|
fin->fin_ifp = ifp;
|
|
(void) fr_send_icmp_err(ICMP_UNREACH, fin, 1);
|
|
fin->fin_ifp = sifp;
|
|
fin->fin_icode = code;
|
|
}
|
|
FREE_MB_T(m);
|
|
goto done;
|
|
}
|
|
|
|
|
|
#if defined(USE_INET6)
|
|
/*
|
|
* This is the IPv6 specific fastroute code. It doesn't clean up the mbuf's
|
|
* or ensure that it is an IPv6 packet that is being forwarded, those are
|
|
* expected to be done by the called (ipfr_fastroute).
|
|
*/
|
|
static int ipfr_fastroute6(m0, mpp, fin, fdp)
|
|
struct mbuf *m0, **mpp;
|
|
fr_info_t *fin;
|
|
frdest_t *fdp;
|
|
{
|
|
struct route_in6 ip6route;
|
|
struct sockaddr_in6 *dst6;
|
|
struct route_in6 *ro;
|
|
struct ifnet *ifp;
|
|
frentry_t *fr;
|
|
u_long mtu;
|
|
int error;
|
|
|
|
ro = &ip6route;
|
|
fr = fin->fin_fr;
|
|
bzero((caddr_t)ro, sizeof(*ro));
|
|
dst6 = (struct sockaddr_in6 *)&ro->ro_dst;
|
|
dst6->sin6_family = AF_INET6;
|
|
dst6->sin6_len = sizeof(struct sockaddr_in6);
|
|
dst6->sin6_addr = fin->fin_fi.fi_dst.in6;
|
|
|
|
if (fdp != NULL)
|
|
ifp = fdp->fd_ifp;
|
|
else
|
|
ifp = fin->fin_ifp;
|
|
|
|
if ((fr != NULL) && (fin->fin_rev != 0)) {
|
|
if ((ifp != NULL) && (fdp == &fr->fr_tif))
|
|
return 0;
|
|
} else if (fdp != NULL) {
|
|
if (IP6_NOTZERO(&fdp->fd_ip6))
|
|
dst6->sin6_addr = fdp->fd_ip6.in6;
|
|
}
|
|
|
|
rtalloc((struct route *)ro);
|
|
|
|
if ((ifp == NULL) && (ro->ro_rt != NULL))
|
|
ifp = ro->ro_rt->rt_ifp;
|
|
|
|
if ((ro->ro_rt == NULL) || (ifp == NULL)) {
|
|
error = EHOSTUNREACH;
|
|
goto bad;
|
|
}
|
|
|
|
/* KAME */
|
|
if (IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr))
|
|
dst6->sin6_addr.s6_addr16[1] = htons(ifp->if_index);
|
|
|
|
{
|
|
#if (__NetBSD_Version__ >= 106010000)
|
|
struct in6_addr finaldst = fin->fin_dst6;
|
|
int frag;
|
|
#endif
|
|
if (ro->ro_rt->rt_flags & RTF_GATEWAY)
|
|
dst6 = (struct sockaddr_in6 *)ro->ro_rt->rt_gateway;
|
|
ro->ro_rt->rt_use++;
|
|
|
|
#if (__NetBSD_Version__ <= 106009999)
|
|
mtu = nd_ifinfo[ifp->if_index].linkmtu;
|
|
#else
|
|
/* Determine path MTU. */
|
|
error = ip6_getpmtu(ro, ro, ifp, &finaldst, &mtu, &frag);
|
|
#endif
|
|
if ((error == 0) && (m0->m_pkthdr.len <= mtu)) {
|
|
*mpp = NULL;
|
|
error = nd6_output(ifp, fin->fin_ifp, m0,
|
|
dst6, ro->ro_rt);
|
|
} else {
|
|
error = EMSGSIZE;
|
|
}
|
|
}
|
|
bad:
|
|
if (ro->ro_rt != NULL) {
|
|
RTFREE(ro->ro_rt);
|
|
}
|
|
return error;
|
|
}
|
|
#endif
|
|
|
|
|
|
int fr_verifysrc(fin)
|
|
fr_info_t *fin;
|
|
{
|
|
struct sockaddr_in *dst;
|
|
struct route iproute;
|
|
|
|
bzero((char *)&iproute, sizeof(iproute));
|
|
dst = (struct sockaddr_in *)&iproute.ro_dst;
|
|
dst->sin_len = sizeof(*dst);
|
|
dst->sin_family = AF_INET;
|
|
dst->sin_addr = fin->fin_src;
|
|
rtalloc(&iproute);
|
|
if (iproute.ro_rt == NULL)
|
|
return 0;
|
|
return (fin->fin_ifp == iproute.ro_rt->rt_ifp);
|
|
}
|
|
|
|
|
|
/*
|
|
* return the first IP Address associated with an interface
|
|
*/
|
|
int fr_ifpaddr(v, atype, ifptr, inp, inpmask)
|
|
int v, atype;
|
|
void *ifptr;
|
|
struct in_addr *inp, *inpmask;
|
|
{
|
|
#ifdef USE_INET6
|
|
struct in6_addr *inp6 = NULL;
|
|
#endif
|
|
struct sockaddr *sock, *mask;
|
|
struct sockaddr_in *sin;
|
|
struct ifaddr *ifa;
|
|
struct ifnet *ifp;
|
|
|
|
if ((ifptr == NULL) || (ifptr == (void *)-1))
|
|
return -1;
|
|
|
|
ifp = ifptr;
|
|
mask = NULL;
|
|
|
|
if (v == 4)
|
|
inp->s_addr = 0;
|
|
#ifdef USE_INET6
|
|
else if (v == 6)
|
|
bzero((char *)inp, sizeof(struct in6_addr));
|
|
#endif
|
|
|
|
ifa = ifp->if_addrlist.tqh_first;
|
|
sock = ifa->ifa_addr;
|
|
while (sock != NULL && ifa != NULL) {
|
|
sin = (struct sockaddr_in *)sock;
|
|
if ((v == 4) && (sin->sin_family == AF_INET))
|
|
break;
|
|
#ifdef USE_INET6
|
|
if ((v == 6) && (sin->sin_family == AF_INET6)) {
|
|
inp6 = &((struct sockaddr_in6 *)sin)->sin6_addr;
|
|
if (!IN6_IS_ADDR_LINKLOCAL(inp6) &&
|
|
!IN6_IS_ADDR_LOOPBACK(inp6))
|
|
break;
|
|
}
|
|
#endif
|
|
ifa = ifa->ifa_list.tqe_next;
|
|
if (ifa != NULL)
|
|
sock = ifa->ifa_addr;
|
|
}
|
|
if (ifa == NULL || sock == NULL)
|
|
return -1;
|
|
|
|
mask = ifa->ifa_netmask;
|
|
if (atype == FRI_BROADCAST)
|
|
sock = ifa->ifa_broadaddr;
|
|
else if (atype == FRI_PEERADDR)
|
|
sock = ifa->ifa_dstaddr;
|
|
|
|
#ifdef USE_INET6
|
|
if (v == 6)
|
|
return fr_ifpfillv6addr(atype, (struct sockaddr_in6 *)sock,
|
|
(struct sockaddr_in6 *)mask,
|
|
inp, inpmask);
|
|
#endif
|
|
return fr_ifpfillv4addr(atype, (struct sockaddr_in *)sock,
|
|
(struct sockaddr_in *)mask, inp, inpmask);
|
|
}
|
|
|
|
|
|
u_32_t fr_newisn(fin)
|
|
fr_info_t *fin;
|
|
{
|
|
u_32_t newiss;
|
|
#if __NetBSD_Version >= 105190000 /* 1.5T */
|
|
size_t asz;
|
|
|
|
|
|
if (fin->fin_v == 4)
|
|
asz = sizeof(struct in_addr);
|
|
else if (fin->fin_v == 6)
|
|
asz = sizeof(fin->fin_src);
|
|
newiss = tcp_new_iss1((void *)&fin->fin_src, (void *)&fin->fin_dst,
|
|
fin->fin_sport, fin->fin_dport, asz);
|
|
#else
|
|
static int iss_seq_off = 0;
|
|
u_char hash[16];
|
|
MD5_CTX ctx;
|
|
|
|
/*
|
|
* Compute the base value of the ISS. It is a hash
|
|
* of (saddr, sport, daddr, dport, secret).
|
|
*/
|
|
MD5Init(&ctx);
|
|
|
|
MD5Update(&ctx, (u_char *) &fin->fin_fi.fi_src,
|
|
sizeof(fin->fin_fi.fi_src));
|
|
MD5Update(&ctx, (u_char *) &fin->fin_fi.fi_dst,
|
|
sizeof(fin->fin_fi.fi_dst));
|
|
MD5Update(&ctx, (u_char *) &fin->fin_dat, sizeof(fin->fin_dat));
|
|
|
|
MD5Update(&ctx, ipf_iss_secret, sizeof(ipf_iss_secret));
|
|
|
|
MD5Final(hash, &ctx);
|
|
|
|
memcpy(&newiss, hash, sizeof(newiss));
|
|
|
|
/*
|
|
* Now increment our "timer", and add it in to
|
|
* the computed value.
|
|
*
|
|
* XXX Use `addin'?
|
|
* XXX TCP_ISSINCR too large to use?
|
|
*/
|
|
iss_seq_off += 0x00010000;
|
|
newiss += iss_seq_off;
|
|
#endif
|
|
return newiss;
|
|
}
|
|
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
/* Function: fr_nextipid */
|
|
/* Returns: int - 0 == success, -1 == error (packet should be droppped) */
|
|
/* Parameters: fin(I) - pointer to packet information */
|
|
/* */
|
|
/* Returns the next IPv4 ID to use for this packet. */
|
|
/* ------------------------------------------------------------------------ */
|
|
u_short fr_nextipid(fin)
|
|
fr_info_t *fin;
|
|
{
|
|
static u_short ipid = 0;
|
|
u_short id;
|
|
|
|
MUTEX_ENTER(&ipf_rw);
|
|
id = ipid++;
|
|
MUTEX_EXIT(&ipf_rw);
|
|
|
|
return id;
|
|
}
|
|
|
|
|
|
INLINE void fr_checkv4sum(fin)
|
|
fr_info_t *fin;
|
|
{
|
|
#ifdef M_CSUM_TCP_UDP_BAD
|
|
int manual, pflag, cflags, active;
|
|
mb_t *m;
|
|
|
|
if ((fin->fin_flx & FI_NOCKSUM) != 0)
|
|
return;
|
|
|
|
manual = 0;
|
|
m = fin->fin_m;
|
|
if (m == NULL) {
|
|
manual = 1;
|
|
goto skipauto;
|
|
}
|
|
|
|
switch (fin->fin_p)
|
|
{
|
|
case IPPROTO_UDP :
|
|
pflag = M_CSUM_UDPv4;
|
|
break;
|
|
case IPPROTO_TCP :
|
|
pflag = M_CSUM_TCPv4;
|
|
break;
|
|
default :
|
|
pflag = 0;
|
|
manual = 1;
|
|
break;
|
|
}
|
|
|
|
active = ((struct ifnet *)fin->fin_ifp)->if_csum_flags_rx & pflag;
|
|
active |= M_CSUM_TCP_UDP_BAD | M_CSUM_DATA;
|
|
cflags = m->m_pkthdr.csum_flags & active;
|
|
|
|
if (pflag != 0) {
|
|
if (cflags == (pflag | M_CSUM_TCP_UDP_BAD)) {
|
|
fin->fin_flx |= FI_BAD;
|
|
} else if (cflags == (pflag | M_CSUM_DATA)) {
|
|
if ((m->m_pkthdr.csum_data ^ 0xffff) != 0)
|
|
fin->fin_flx |= FI_BAD;
|
|
} else if (cflags == pflag) {
|
|
;
|
|
} else {
|
|
manual = 1;
|
|
}
|
|
}
|
|
skipauto:
|
|
# ifdef IPFILTER_CKSUM
|
|
if (manual != 0)
|
|
if (fr_checkl4sum(fin) == -1)
|
|
fin->fin_flx |= FI_BAD;
|
|
# else
|
|
;
|
|
# endif
|
|
#else
|
|
# ifdef IPFILTER_CKSUM
|
|
if (fr_checkl4sum(fin) == -1)
|
|
fin->fin_flx |= FI_BAD;
|
|
# endif
|
|
#endif
|
|
}
|
|
|
|
|
|
#ifdef USE_INET6
|
|
INLINE void fr_checkv6sum(fin)
|
|
fr_info_t *fin;
|
|
{
|
|
# ifdef M_CSUM_TCP_UDP_BAD
|
|
int manual, pflag, cflags, active;
|
|
mb_t *m;
|
|
|
|
if ((fin->fin_flx & FI_NOCKSUM) != 0)
|
|
return;
|
|
|
|
manual = 0;
|
|
m = fin->fin_m;
|
|
|
|
switch (fin->fin_p)
|
|
{
|
|
case IPPROTO_UDP :
|
|
pflag = M_CSUM_UDPv6;
|
|
break;
|
|
case IPPROTO_TCP :
|
|
pflag = M_CSUM_TCPv6;
|
|
break;
|
|
default :
|
|
pflag = 0;
|
|
manual = 1;
|
|
break;
|
|
}
|
|
|
|
active = ((struct ifnet *)fin->fin_ifp)->if_csum_flags_rx & pflag;
|
|
active |= M_CSUM_TCP_UDP_BAD | M_CSUM_DATA;
|
|
cflags = m->m_pkthdr.csum_flags & active;
|
|
|
|
if (pflag != 0) {
|
|
if (cflags == (pflag | M_CSUM_TCP_UDP_BAD)) {
|
|
fin->fin_flx |= FI_BAD;
|
|
} else if (cflags == (pflag | M_CSUM_DATA)) {
|
|
if ((m->m_pkthdr.csum_data ^ 0xffff) != 0)
|
|
fin->fin_flx |= FI_BAD;
|
|
} else if (cflags == pflag) {
|
|
;
|
|
} else {
|
|
manual = 1;
|
|
}
|
|
}
|
|
# ifdef IPFILTER_CKSUM
|
|
if (manual != 0)
|
|
if (fr_checkl4sum(fin) == -1)
|
|
fin->fin_flx |= FI_BAD;
|
|
# endif
|
|
# else
|
|
# ifdef IPFILTER_CKSUM
|
|
if (fr_checkl4sum(fin) == -1)
|
|
fin->fin_flx |= FI_BAD;
|
|
# endif
|
|
# endif
|
|
}
|
|
#endif /* USE_INET6 */
|
|
|
|
|
|
size_t mbufchainlen(m0)
|
|
struct mbuf *m0;
|
|
{
|
|
size_t len;
|
|
|
|
if ((m0->m_flags & M_PKTHDR) != 0) {
|
|
len = m0->m_pkthdr.len;
|
|
} else {
|
|
struct mbuf *m;
|
|
|
|
for (m = m0, len = 0; m != NULL; m = m->m_next)
|
|
len += m->m_len;
|
|
}
|
|
return len;
|
|
}
|