2289 lines
49 KiB
C
2289 lines
49 KiB
C
/* $NetBSD: ip_fil_netbsd.c,v 1.37 2022/03/28 12:33:21 riastradh Exp $ */
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/*
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* Copyright (C) 2012 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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#if defined(__NetBSD__)
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: ip_fil_netbsd.c,v 1.37 2022/03/28 12:33:21 riastradh Exp $");
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#else
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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 1.1.1.2 2012/07/22 13:45:17 darrenr Exp";
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#endif
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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)
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# if (__NetBSD_Version__ >= 799003000)
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# ifdef _KERNEL_OPT
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# include "opt_ipsec.h"
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# endif
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# else
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# include "opt_ipsec.h"
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# endif
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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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#include <sys/select.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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#if (__NetBSD_Version__ >= 599005900)
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# include <sys/cprng.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 <sys/poll.h>
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#if (__NetBSD_Version__ >= 399002000)
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# include <sys/kauth.h>
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#endif
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#if (__NetBSD_Version__ >= 799003000)
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#include <sys/module.h>
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#include <sys/mutex.h>
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#endif
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#if defined(__NetBSD__)
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#include <netinet/in_offload.h>
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#endif
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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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#if __NetBSD_Version__ >= 105190000 /* 1.5T */
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# include <netinet/tcp_timer.h>
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# include <netinet/tcp_var.h>
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#endif
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#include <netinet/udp.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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# if __NetBSD_Version__ >= 499001100
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# include <netinet6/scope6_var.h>
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# include <netinet6/in6_offload.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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#include "netinet/ip_sync.h"
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#include "netinet/ip_lookup.h"
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#include "netinet/ip_dstlist.h"
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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 <sys/md5.h>
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#include <sys/kernel.h>
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#include <sys/conf.h>
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#ifdef INET
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extern int ip_optcopy (struct ip *, struct ip *);
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#endif
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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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#if __NetBSD_Version__ < 200000000
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extern struct protosw inetsw[];
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#endif
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#if (__NetBSD_Version__ >= 599002000)
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static kauth_listener_t ipf_listener;
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#endif
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#if (__NetBSD_Version__ < 399001400)
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extern int ip6_getpmtu (struct route_in6 *, struct route_in6 *,
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struct ifnet *, struct in6_addr *, u_long *,
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int *);
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#endif
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#if (NetBSD >= 199511)
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static int ipfopen(dev_t dev, int flags, int devtype, PROC_T *p);
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static int ipfclose(dev_t dev, int flags, int devtype, PROC_T *p);
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#else
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# if (__NetBSD_Version__ >= 399001400)
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static int ipfopen(dev_t dev, int flags, struct lwp *);
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static int ipfclose(dev_t dev, int flags, struct lwp *);
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# else
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static int ipfopen(dev_t dev, int flags);
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static int ipfclose(dev_t dev, int flags);
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# endif /* __NetBSD_Version__ >= 399001400 */
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#endif
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static int ipfread(dev_t, struct uio *, int ioflag);
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static int ipfwrite(dev_t, struct uio *, int ioflag);
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static int ipfpoll(dev_t, int events, PROC_T *);
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static void ipf_timer_func(void *ptr);
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const struct cdevsw ipl_cdevsw = {
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.d_open = ipfopen,
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.d_close = ipfclose,
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.d_read = ipfread,
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.d_write = ipfwrite,
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.d_ioctl = ipfioctl,
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.d_stop = nostop,
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.d_tty = notty,
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.d_poll = ipfpoll,
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.d_mmap = nommap,
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#if (__NetBSD_Version__ >= 200000000)
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.d_kqfilter = nokqfilter,
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#endif
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.d_discard = nodiscard,
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#ifdef D_OTHER
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.d_flag = D_OTHER
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#else
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.d_flag = 0
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#endif
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};
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#if (__NetBSD_Version__ >= 799003000)
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kmutex_t ipf_ref_mutex;
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int ipf_active;
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#endif
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ipf_main_softc_t ipfmain;
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static u_short ipid = 0;
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static int (*ipf_savep)(void *, ip_t *, int, void *, int, struct mbuf **);
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static int ipf_send_ip(fr_info_t *, mb_t *);
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#ifdef USE_INET6
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static int ipf_fastroute6(struct mbuf *, struct mbuf **,
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fr_info_t *, frdest_t *);
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#endif
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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 ipf_checkp name just to minimize changes later.
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*/
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int (*ipf_checkp)(void *, ip_t *ip, int hlen, void *ifp, int out, mb_t **mp);
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#endif /* NETBSD_PF */
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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 ipf_check_wrapper(void *, struct mbuf **, struct ifnet *, int );
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static int
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ipf_check_wrapper(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir)
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{
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struct ip *ip;
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int rv, hlen;
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#if __NetBSD_Version__ >= 200080000
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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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int 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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#endif
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ip = mtod(*mp, struct ip *);
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hlen = ip->ip_hl << 2;
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#ifdef INET
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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_undefer_cksum_tcpudp(*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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#endif /* INET */
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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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rv = ipf_check(&ipfmain, ip, hlen, ifp, (dir == PFIL_OUT), mp);
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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 ipf_check_wrapper6(void *, struct mbuf **, struct ifnet *, int );
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static int
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ipf_check_wrapper6(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir)
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{
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#if defined(INET6)
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# if defined(M_CSUM_TCPv6) && (__NetBSD_Version__ > 200000000)
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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_TCPv6|M_CSUM_UDPv6)) {
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# if (__NetBSD_Version__ > 399000600)
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in6_undefer_cksum_tcpudp(*mp);
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# endif
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(*mp)->m_pkthdr.csum_flags &= ~(M_CSUM_TCPv6|
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M_CSUM_UDPv6);
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}
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}
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# endif
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#endif /* INET6 */
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return (ipf_check(&ipfmain, 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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# if defined(PFIL_TYPE_IFNET) && defined(PFIL_IFNET)
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# if (__NetBSD_Version__ >= 799000400)
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static void ipf_pfilsync(void *, unsigned long, void *);
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static void
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ipf_pfilsync(void *hdr, unsigned long cmd, void *arg2)
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{
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/*
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* The interface pointer is useless for create (we have nothing to
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* compare it to) and at detach, the interface name is still in the
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* list of active NICs (albeit, down, but that's not any real
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* indicator) and doing ifunit() on the name will still return the
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* pointer, so it's not much use then, either.
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*/
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ipf_sync(&ipfmain, NULL);
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}
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# else
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static int ipf_pfilsync(void *, struct mbuf **, struct ifnet *, int);
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static int
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ipf_pfilsync(void *hdr, struct mbuf **mp, struct ifnet *ifp, int dir)
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{
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ipf_sync(&ipfmain, NULL);
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return 0;
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}
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# endif
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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
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ipf_identify(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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#if (__NetBSD_Version__ >= 599002000)
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static int
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ipf_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie,
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void *arg0, void *arg1, void *arg2, void *arg3)
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{
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int result;
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enum kauth_network_req req;
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result = KAUTH_RESULT_DEFER;
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req = (enum kauth_network_req)(uintptr_t)arg0;
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if (action != KAUTH_NETWORK_FIREWALL)
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return result;
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/* These must have came from device context. */
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if ((req == KAUTH_REQ_NETWORK_FIREWALL_FW) ||
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(req == KAUTH_REQ_NETWORK_FIREWALL_NAT))
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result = KAUTH_RESULT_ALLOW;
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return result;
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}
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#endif
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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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void
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ipfilterattach(int count)
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{
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#if (__NetBSD_Version__ >= 799003000)
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return;
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#else
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#if (__NetBSD_Version__ >= 599002000)
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ipf_listener = kauth_listen_scope(KAUTH_SCOPE_NETWORK,
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ipf_listener_cb, NULL);
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#endif
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if (ipf_load_all() == 0)
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(void) ipf_create_all(&ipfmain);
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#endif
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}
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int
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ipfattach(ipf_main_softc_t *softc)
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{
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SPL_INT(s);
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#if (__NetBSD_Version__ >= 499005500)
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int i;
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#endif
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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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pfil_head_t *ph_inet;
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# ifdef USE_INET6
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pfil_head_t *ph_inet6;
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# endif
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# if defined(PFIL_TYPE_IFNET) && defined(PFIL_IFNET)
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pfil_head_t *ph_ifsync;
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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 ((softc->ipf_running > 0) || (ipf_checkp == ipf_check)) {
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printf("IP Filter: already initialized\n");
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SPL_X(s);
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IPFERROR(130017);
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return EBUSY;
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}
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if (ipf_init_all(softc) < 0) {
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SPL_X(s);
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IPFERROR(130015);
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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, (void *)AF_INET);
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# ifdef USE_INET6
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ph_inet6 = pfil_head_get(PFIL_TYPE_AF, (void *)AF_INET6);
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# endif
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# if defined(PFIL_TYPE_IFNET) && defined(PFIL_IFNET)
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ph_ifsync = pfil_head_get(PFIL_TYPE_IFNET, 0);
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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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# if defined(PFIL_TYPE_IFNET) && defined(PFIL_IFNET)
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&& ph_ifsync == NULL
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# endif
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) {
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SPL_X(s);
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IPFERROR(130016);
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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 *)ipf_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 *)ipf_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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IPFERROR(130013);
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goto pfil_error;
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}
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# else
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pfil_add_hook((void *)ipf_check, PFIL_IN|PFIL_OUT);
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# endif
|
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|
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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 *)ipf_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 *)ipf_check_wrapper6, NULL,
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PFIL_IN|PFIL_OUT, ph_inet6);
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ipfmain.ipf_interror = 130014;
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goto pfil_error;
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}
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# else
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error = pfil_add_hook((void *)ipf_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 *)ipf_check, PFIL_IN|PFIL_OUT,
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&inetsw[ip_protox[IPPROTO_IP]].pr_pfh);
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IPFERROR(130014);
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goto pfil_error;
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}
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# endif
|
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# endif
|
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# if defined(PFIL_TYPE_IFNET) && defined(PFIL_IFNET)
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if (ph_ifsync != NULL)
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#if (__NetBSD_Version__ >= 799000400)
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(void) pfil_add_ihook((void *)ipf_pfilsync, NULL,
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PFIL_IFNET, ph_ifsync);
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#else
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(void) pfil_add_hook((void *)ipf_pfilsync, NULL,
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PFIL_IFNET, ph_ifsync);
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#endif
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# endif
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#endif
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#if (__NetBSD_Version__ >= 499005500)
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for (i = 0; i < IPL_LOGSIZE; i++)
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selinit(&ipfmain.ipf_selwait[i]);
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#else
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bzero((char *)ipfmain.ipf_selwait, sizeof(ipfmain.ipf_selwait));
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#endif
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ipf_savep = ipf_checkp;
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ipf_checkp = ipf_check;
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#ifdef INET
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if (softc->ipf_control_forwarding & 1)
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ipforwarding = 1;
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#endif
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ipid = 0;
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SPL_X(s);
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#if (__NetBSD_Version__ >= 104010000)
|
|
# if (__NetBSD_Version__ >= 499002000)
|
|
callout_init(&softc->ipf_slow_ch, 0);
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# else
|
|
callout_init(&softc->ipf_slow_ch);
|
|
# endif
|
|
callout_reset(&softc->ipf_slow_ch, (hz / IPF_HZ_DIVIDE) * IPF_HZ_MULT,
|
|
ipf_timer_func, softc);
|
|
#else
|
|
timeout(ipf_timer_func, softc, (hz / IPF_HZ_DIVIDE) * IPF_HZ_MULT);
|
|
#endif
|
|
|
|
return 0;
|
|
|
|
#if __NetBSD_Version__ >= 105110000
|
|
pfil_error:
|
|
SPL_X(s);
|
|
ipf_fini_all(softc);
|
|
return error;
|
|
#endif
|
|
}
|
|
|
|
static void
|
|
ipf_timer_func(void *ptr)
|
|
{
|
|
ipf_main_softc_t *softc = ptr;
|
|
SPL_INT(s);
|
|
|
|
SPL_NET(s);
|
|
READ_ENTER(&softc->ipf_global);
|
|
|
|
if (softc->ipf_running > 0)
|
|
ipf_slowtimer(softc);
|
|
|
|
if (softc->ipf_running == -1 || softc->ipf_running == 1) {
|
|
#if NETBSD_GE_REV(104240000)
|
|
callout_reset(&softc->ipf_slow_ch, hz / 2,
|
|
ipf_timer_func, softc);
|
|
#else
|
|
timeout(ipf_timer_func, softc,
|
|
(hz / IPF_HZ_DIVIDE) * IPF_HZ_MULT);
|
|
#endif
|
|
}
|
|
RWLOCK_EXIT(&softc->ipf_global);
|
|
SPL_X(s);
|
|
}
|
|
|
|
|
|
/*
|
|
* Disable the filter by removing the hooks from the IP input/output
|
|
* stream.
|
|
*/
|
|
int
|
|
ipfdetach(ipf_main_softc_t *softc)
|
|
{
|
|
SPL_INT(s);
|
|
#if (__NetBSD_Version__ >= 499005500)
|
|
int i;
|
|
#endif
|
|
#if defined(NETBSD_PF) && (__NetBSD_Version__ >= 104200000)
|
|
int error = 0;
|
|
# if __NetBSD_Version__ >= 105150000
|
|
pfil_head_t *ph_inet = pfil_head_get(PFIL_TYPE_AF, (void *)AF_INET);
|
|
# ifdef USE_INET6
|
|
pfil_head_t *ph_inet6 = pfil_head_get(PFIL_TYPE_AF, (void *)AF_INET6);
|
|
# endif
|
|
# if defined(PFIL_TYPE_IFNET) && defined(PFIL_IFNET)
|
|
struct pfil_head *ph_ifsync = pfil_head_get(PFIL_TYPE_IFNET, 0);
|
|
# endif
|
|
# endif
|
|
#endif
|
|
|
|
SPL_NET(s);
|
|
|
|
#if (__NetBSD_Version__ >= 104010000)
|
|
if (softc->ipf_running > 0)
|
|
callout_stop(&softc->ipf_slow_ch);
|
|
#else
|
|
untimeout(ipf_slowtimer, NULL);
|
|
#endif /* NetBSD */
|
|
|
|
ipf_checkp = ipf_savep;
|
|
(void) ipf_flush(softc, IPL_LOGIPF, FR_INQUE|FR_OUTQUE|FR_INACTIVE);
|
|
(void) ipf_flush(softc, IPL_LOGIPF, FR_INQUE|FR_OUTQUE);
|
|
|
|
#ifdef INET
|
|
if (softc->ipf_control_forwarding & 2)
|
|
ipforwarding = 0;
|
|
#endif
|
|
|
|
#ifdef NETBSD_PF
|
|
# if (__NetBSD_Version__ >= 104200000)
|
|
# if __NetBSD_Version__ >= 105110000
|
|
# if defined(PFIL_TYPE_IFNET) && defined(PFIL_IFNET)
|
|
# if __NetBSD_Version__ >= 799000400
|
|
(void) pfil_remove_ihook((void *)ipf_pfilsync, NULL,
|
|
PFIL_IFNET, ph_ifsync);
|
|
# else
|
|
(void) pfil_remove_hook((void *)ipf_pfilsync, NULL,
|
|
PFIL_IFNET, ph_ifsync);
|
|
# endif
|
|
# endif
|
|
|
|
if (ph_inet != NULL)
|
|
error = pfil_remove_hook((void *)ipf_check_wrapper, NULL,
|
|
PFIL_IN|PFIL_OUT, ph_inet);
|
|
else
|
|
error = 0;
|
|
# else
|
|
error = pfil_remove_hook((void *)ipf_check, PFIL_IN|PFIL_OUT,
|
|
&inetsw[ip_protox[IPPROTO_IP]].pr_pfh);
|
|
# endif
|
|
if (error) {
|
|
SPL_X(s);
|
|
IPFERROR(130011);
|
|
return error;
|
|
}
|
|
# else
|
|
pfil_remove_hook((void *)ipf_check, PFIL_IN|PFIL_OUT);
|
|
# endif
|
|
# ifdef USE_INET6
|
|
# if __NetBSD_Version__ >= 105110000
|
|
if (ph_inet6 != NULL)
|
|
error = pfil_remove_hook((void *)ipf_check_wrapper6, NULL,
|
|
PFIL_IN|PFIL_OUT, ph_inet6);
|
|
else
|
|
error = 0;
|
|
# else
|
|
error = pfil_remove_hook((void *)ipf_check, PFIL_IN|PFIL_OUT,
|
|
&inetsw[ip_protox[IPPROTO_IPV6]].pr_pfh);
|
|
# endif
|
|
if (error) {
|
|
SPL_X(s);
|
|
IPFERROR(130012);
|
|
return error;
|
|
}
|
|
# endif
|
|
#endif
|
|
SPL_X(s);
|
|
|
|
#if (__NetBSD_Version__ >= 499005500)
|
|
for (i = 0; i < IPL_LOGSIZE; i++)
|
|
seldestroy(&ipfmain.ipf_selwait[i]);
|
|
#endif
|
|
|
|
ipf_fini_all(softc);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* Filter ioctl interface.
|
|
*/
|
|
int
|
|
ipfioctl(dev_t dev, u_long cmd,
|
|
#if (__NetBSD_Version__ >= 499001000)
|
|
void *data,
|
|
#else
|
|
caddr_t data,
|
|
#endif
|
|
int mode
|
|
#if (NetBSD >= 199511)
|
|
# if (__NetBSD_Version__ >= 399001400)
|
|
, struct lwp *p
|
|
# if (__NetBSD_Version__ >= 399002000)
|
|
# define UID(l) kauth_cred_getuid((l)->l_cred)
|
|
# else
|
|
# define UID(l) ((l)->l_proc->p_cred->p_ruid)
|
|
# endif
|
|
# else
|
|
, struct proc *p
|
|
# define UID(p) ((p)->p_cred->p_ruid)
|
|
# endif
|
|
#endif
|
|
)
|
|
{
|
|
int error = 0, unit = 0;
|
|
SPL_INT(s);
|
|
|
|
#if (__NetBSD_Version__ >= 399002000)
|
|
if ((mode & FWRITE) &&
|
|
kauth_authorize_network(p->l_cred, KAUTH_NETWORK_FIREWALL,
|
|
KAUTH_REQ_NETWORK_FIREWALL_FW, NULL,
|
|
NULL, NULL)) {
|
|
ipfmain.ipf_interror = 130005;
|
|
return EPERM;
|
|
}
|
|
#else
|
|
if ((securelevel >= 2) && (mode & FWRITE)) {
|
|
ipfmain.ipf_interror = 130001;
|
|
return EPERM;
|
|
}
|
|
#endif
|
|
|
|
unit = GET_MINOR(dev);
|
|
if ((IPL_LOGMAX < unit) || (unit < 0)) {
|
|
ipfmain.ipf_interror = 130002;
|
|
return ENXIO;
|
|
}
|
|
|
|
if (ipfmain.ipf_running <= 0) {
|
|
if (unit != IPL_LOGIPF && cmd != SIOCIPFINTERROR) {
|
|
ipfmain.ipf_interror = 130003;
|
|
return EIO;
|
|
}
|
|
if (cmd != SIOCIPFGETNEXT && cmd != SIOCIPFGET &&
|
|
cmd != SIOCIPFSET && cmd != SIOCFRENB &&
|
|
cmd != SIOCGETFS && cmd != SIOCGETFF &&
|
|
cmd != SIOCIPFINTERROR) {
|
|
ipfmain.ipf_interror = 130004;
|
|
return EIO;
|
|
}
|
|
}
|
|
|
|
SPL_NET(s);
|
|
|
|
error = ipf_ioctlswitch(&ipfmain, unit, data, cmd, mode, UID(p), p);
|
|
if (error != -1) {
|
|
SPL_X(s);
|
|
return error;
|
|
}
|
|
|
|
SPL_X(s);
|
|
return error;
|
|
}
|
|
|
|
|
|
/*
|
|
* ipf_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
|
|
ipf_send_reset(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 */
|
|
|
|
if (ipf_checkl4sum(fin) == -1)
|
|
return -1;
|
|
|
|
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_reset_rcvif(m);
|
|
ip = mtod(m, struct ip *);
|
|
bzero((char *)ip, hlen);
|
|
#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 = ((ip6_t *)fin->fin_ip)->ip6_flow;
|
|
ip6->ip6_plen = htons(sizeof(struct tcphdr));
|
|
ip6->ip6_nxt = IPPROTO_TCP;
|
|
ip6->ip6_hlim = 0;
|
|
ip6->ip6_src = fin->fin_dst6.in6;
|
|
ip6->ip6_dst = fin->fin_src6.in6;
|
|
tcp2->th_sum = in6_cksum(m, IPPROTO_TCP,
|
|
sizeof(*ip6), sizeof(*tcp2));
|
|
return ipf_send_ip(fin, m);
|
|
}
|
|
#endif
|
|
#ifdef INET
|
|
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 ipf_send_ip(fin, m);
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
|
|
/*
|
|
* Expects ip_len to be in host byte order when called.
|
|
*/
|
|
static int
|
|
ipf_send_ip(fr_info_t *fin, mb_t *m)
|
|
{
|
|
fr_info_t fnew;
|
|
#ifdef INET
|
|
ip_t *oip;
|
|
#endif
|
|
ip_t *ip;
|
|
int hlen;
|
|
|
|
ip = mtod(m, ip_t *);
|
|
bzero((char *)&fnew, sizeof(fnew));
|
|
fnew.fin_main_soft = fin->fin_main_soft;
|
|
|
|
IP_V_A(ip, fin->fin_v);
|
|
switch (fin->fin_v)
|
|
{
|
|
#ifdef INET
|
|
case 4 :
|
|
oip = fin->fin_ip;
|
|
hlen = sizeof(*oip);
|
|
fnew.fin_v = 4;
|
|
fnew.fin_p = ip->ip_p;
|
|
fnew.fin_plen = ntohs(ip->ip_len);
|
|
HTONS(ip->ip_len);
|
|
IP_HL_A(ip, sizeof(*oip) >> 2);
|
|
ip->ip_tos = oip->ip_tos;
|
|
ip->ip_id = ipf_nextipid(fin);
|
|
ip->ip_off = htons(ip_mtudisc ? IP_DF : 0);
|
|
ip->ip_ttl = ip_defttl;
|
|
ip->ip_sum = 0;
|
|
break;
|
|
#endif
|
|
#ifdef USE_INET6
|
|
case 6 :
|
|
{
|
|
ip6_t *ip6 = (ip6_t *)ip;
|
|
|
|
ip6->ip6_vfc = 0x60;
|
|
ip6->ip6_hlim = IPDEFTTL;
|
|
|
|
hlen = sizeof(*ip6);
|
|
fnew.fin_p = ip6->ip6_nxt;
|
|
fnew.fin_v = 6;
|
|
fnew.fin_plen = ntohs(ip6->ip6_plen) + hlen;
|
|
break;
|
|
}
|
|
#endif
|
|
default :
|
|
return EINVAL;
|
|
}
|
|
#ifdef KAME_IPSEC
|
|
m_reset_rcvif(m);
|
|
#endif
|
|
|
|
fnew.fin_ifp = fin->fin_ifp;
|
|
fnew.fin_flx = FI_NOCKSUM;
|
|
fnew.fin_m = m;
|
|
fnew.fin_ip = ip;
|
|
fnew.fin_mp = &m;
|
|
fnew.fin_hlen = hlen;
|
|
fnew.fin_dp = (char *)ip + hlen;
|
|
(void) ipf_makefrip(hlen, ip, &fnew);
|
|
|
|
return ipf_fastroute(m, &m, &fnew, NULL);
|
|
}
|
|
|
|
|
|
int
|
|
ipf_send_icmp_err(int type, fr_info_t *fin, int dst)
|
|
{
|
|
int err, hlen, xtra, iclen, ohlen, avail;
|
|
struct in_addr dst4;
|
|
struct icmp *icmp;
|
|
struct mbuf *m;
|
|
i6addr_t dst6;
|
|
void *ifp;
|
|
#ifdef USE_INET6
|
|
int code;
|
|
ip6_t *ip6;
|
|
#endif
|
|
ip_t *ip, *ip2;
|
|
|
|
if ((type < 0) || (type > ICMP_MAXTYPE))
|
|
return -1;
|
|
|
|
#ifdef USE_INET6
|
|
code = fin->fin_icode;
|
|
if ((code < 0) || (code >= sizeof(icmptoicmp6unreach)/sizeof(int)))
|
|
return -1;
|
|
#endif
|
|
|
|
if (ipf_checkl4sum(fin) == -1)
|
|
return -1;
|
|
#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;
|
|
dst4.s_addr = 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 :
|
|
FREE_MB_T(m);
|
|
return 0;
|
|
}
|
|
|
|
if (dst == 0) {
|
|
if (ipf_ifpaddr(&ipfmain, 4, FRI_NORMAL, ifp,
|
|
&dst6, NULL) == -1) {
|
|
FREE_MB_T(m);
|
|
return -1;
|
|
}
|
|
dst4 = dst6.in4;
|
|
} else
|
|
dst4.s_addr = fin->fin_daddr;
|
|
|
|
hlen = sizeof(ip_t);
|
|
ohlen = fin->fin_hlen;
|
|
iclen = hlen + offsetof(struct icmp, icmp_ip) + ohlen;
|
|
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);
|
|
iclen = hlen + offsetof(struct icmp, icmp_ip) + ohlen;
|
|
type = icmptoicmp6types[type];
|
|
if (type == ICMP6_DST_UNREACH)
|
|
code = icmptoicmp6unreach[code];
|
|
|
|
if (iclen + 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 - iclen - max_linkhdr);
|
|
xtra = MIN(xtra, IPV6_MMTU - iclen);
|
|
if (dst == 0 && !IN6_IS_ADDR_LINKLOCAL(&fin->fin_dst6.in6)) {
|
|
if (ipf_ifpaddr(&ipfmain, 6, FRI_NORMAL, ifp,
|
|
&dst6, NULL) == -1) {
|
|
FREE_MB_T(m);
|
|
return -1;
|
|
}
|
|
} else
|
|
dst6 = fin->fin_dst6;
|
|
}
|
|
#endif
|
|
else {
|
|
FREE_MB_T(m);
|
|
return -1;
|
|
}
|
|
|
|
avail -= (max_linkhdr + iclen);
|
|
if (avail < 0) {
|
|
FREE_MB_T(m);
|
|
return -1;
|
|
}
|
|
if (xtra > avail)
|
|
xtra = avail;
|
|
iclen += xtra;
|
|
m->m_data += max_linkhdr;
|
|
m_reset_rcvif(m);
|
|
m->m_pkthdr.len = iclen;
|
|
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) {
|
|
if (fin->fin_mtu != 0) {
|
|
icmp->icmp_nextmtu = htons(fin->fin_mtu);
|
|
|
|
} else if (ifp != NULL) {
|
|
icmp->icmp_nextmtu = htons(GETIFMTU_4(ifp));
|
|
|
|
} else { /* make up a number... */
|
|
icmp->icmp_nextmtu = htons(fin->fin_plen - 20);
|
|
}
|
|
}
|
|
#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) {
|
|
ip6->ip6_flow = ((ip6_t *)fin->fin_ip)->ip6_flow;
|
|
ip6->ip6_plen = htons(iclen - hlen);
|
|
ip6->ip6_nxt = IPPROTO_ICMPV6;
|
|
ip6->ip6_hlim = 0;
|
|
ip6->ip6_src = dst6.in6;
|
|
ip6->ip6_dst = fin->fin_src6.in6;
|
|
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 = ipf_send_ip(fin, m);
|
|
return err;
|
|
}
|
|
|
|
|
|
/*
|
|
* m0 - pointer to mbuf where the IP packet starts
|
|
* mpp - pointer to the mbuf pointer that is the start of the mbuf chain
|
|
*/
|
|
int
|
|
ipf_fastroute(mb_t *m0, mb_t **mpp, fr_info_t *fin, frdest_t *fdp)
|
|
{
|
|
register struct ip *ip, *mhip;
|
|
register struct mbuf *m = *mpp;
|
|
register struct route *ro;
|
|
int len, off, error = 0, hlen, code;
|
|
struct ifnet *ifp, *sifp;
|
|
ipf_main_softc_t *softc;
|
|
#if __NetBSD_Version__ >= 499001100
|
|
union {
|
|
struct sockaddr dst;
|
|
struct sockaddr_in dst4;
|
|
} u;
|
|
#else
|
|
struct sockaddr_in *dst4;
|
|
#endif
|
|
struct sockaddr *dst;
|
|
u_short ip_off, ip_len;
|
|
struct route iproute;
|
|
struct rtentry *rt;
|
|
frdest_t node;
|
|
frentry_t *fr;
|
|
|
|
if (fin->fin_v == 6) {
|
|
#ifdef USE_INET6
|
|
error = ipf_fastroute6(m0, mpp, fin, fdp);
|
|
#else
|
|
error = EPROTONOSUPPORT;
|
|
#endif
|
|
if ((error != 0) && (*mpp != NULL))
|
|
FREE_MB_T(*mpp);
|
|
return error;
|
|
}
|
|
#ifndef INET
|
|
FREE_MB_T(*mpp);
|
|
return EPROTONOSUPPORT;
|
|
#else
|
|
|
|
hlen = fin->fin_hlen;
|
|
ip = mtod(m0, struct ip *);
|
|
softc = fin->fin_main_soft;
|
|
rt = NULL;
|
|
ifp = NULL;
|
|
|
|
# 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;
|
|
memset(ro, 0, sizeof(*ro));
|
|
fr = fin->fin_fr;
|
|
|
|
if ((fr != NULL) && !(fr->fr_flags & FR_KEEPSTATE) && (fdp != NULL) &&
|
|
(fdp->fd_type == FRD_DSTLIST)) {
|
|
if (ipf_dstlist_select_node(fin, fdp->fd_ptr, NULL, &node) == 0)
|
|
fdp = &node;
|
|
}
|
|
if (fdp != NULL)
|
|
ifp = fdp->fd_ptr;
|
|
else
|
|
ifp = fin->fin_ifp;
|
|
|
|
if ((ifp == NULL) && ((fr == NULL) || !(fr->fr_flags & FR_FASTROUTE))) {
|
|
error = -2;
|
|
goto bad;
|
|
}
|
|
|
|
# if __NetBSD_Version__ >= 499001100
|
|
if ((fdp != NULL) && (fdp->fd_ip.s_addr != 0))
|
|
sockaddr_in_init(&u.dst4, &fdp->fd_ip, 0);
|
|
else
|
|
sockaddr_in_init(&u.dst4, &ip->ip_dst, 0);
|
|
dst = &u.dst;
|
|
rtcache_setdst(ro, dst);
|
|
rt = rtcache_init(ro);
|
|
# else
|
|
dst4 = (struct sockaddr_in *)&ro->ro_dst;
|
|
dst = (struct sockaddr *)dst4;
|
|
dst4->sin_family = AF_INET;
|
|
dst4->sin_addr = ip->ip_dst;
|
|
|
|
if ((fdp != NULL) && (fdp->fd_ip.s_addr != 0))
|
|
dst4->sin_addr = fdp->fd_ip;
|
|
|
|
dst4->sin_len = sizeof(*dst);
|
|
rtalloc(ro);
|
|
rt = ro->ro_rt;
|
|
# endif
|
|
if ((ifp == NULL) && (rt != NULL))
|
|
ifp = rt->rt_ifp;
|
|
if ((rt == NULL) || (ifp == NULL)) {
|
|
#ifdef INET
|
|
if (in_localaddr(ip->ip_dst))
|
|
error = EHOSTUNREACH;
|
|
else
|
|
#endif
|
|
error = ENETUNREACH;
|
|
goto bad;
|
|
}
|
|
|
|
|
|
if (rt->rt_flags & RTF_GATEWAY)
|
|
dst = rt->rt_gateway;
|
|
|
|
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. Duplicated packets aren't considered to be
|
|
* part of the normal packet stream, so do not NAT them or pass
|
|
* them through stateful checking, etc.
|
|
*/
|
|
if ((fdp != &fr->fr_dif) && (fin->fin_out == 0)) {
|
|
sifp = fin->fin_ifp;
|
|
fin->fin_ifp = ifp;
|
|
fin->fin_out = 1;
|
|
(void) ipf_acctpkt(fin, NULL);
|
|
fin->fin_fr = NULL;
|
|
if (!fr || !(fr->fr_flags & FR_RETMASK)) {
|
|
u_32_t pass;
|
|
|
|
(void) ipf_state_check(fin, &pass);
|
|
}
|
|
|
|
switch (ipf_nat_checkout(fin, NULL))
|
|
{
|
|
case 0 :
|
|
break;
|
|
case 1 :
|
|
ip->ip_sum = 0;
|
|
break;
|
|
case -1 :
|
|
error = -1;
|
|
goto bad;
|
|
break;
|
|
}
|
|
|
|
fin->fin_ifp = sifp;
|
|
fin->fin_out = 0;
|
|
} else
|
|
ip->ip_sum = 0;
|
|
/*
|
|
* If small enough for interface, can just send directly.
|
|
*/
|
|
m_set_rcvif(m, ifp);
|
|
|
|
ip_len = ntohs(ip->ip_len);
|
|
if (ip_len <= ifp->if_mtu) {
|
|
# if defined(M_CSUM_IPv4)
|
|
# if (__NetBSD_Version__ >= 105009999)
|
|
if (ifp->if_csum_flags_tx & M_CSUM_IPv4)
|
|
m->m_pkthdr.csuminfo |= M_CSUM_IPv4;
|
|
# else
|
|
if (ifp->if_capabilities & IFCAP_CSUM_IPv4)
|
|
m->m_pkthdr.csuminfo |= M_CSUM_IPv4;
|
|
# endif /* (__NetBSD_Version__ >= 105009999) */
|
|
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 = if_output_lock(ifp, ifp, m, dst, rt);
|
|
goto done;
|
|
}
|
|
|
|
/*
|
|
* Too large for interface; fragment if possible.
|
|
* Must be able to put at least 8 bytes per fragment.
|
|
*/
|
|
ip_off = ntohs(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_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));
|
|
#ifdef INET
|
|
if (hlen > sizeof (struct ip)) {
|
|
mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip);
|
|
IP_HL_A(mhip, mhlen >> 2);
|
|
}
|
|
#endif
|
|
m->m_len = mhlen;
|
|
mhip->ip_off = ((off - hlen) >> 3) + ip_off;
|
|
if (off + len >= ip_len)
|
|
len = ip_len - off;
|
|
else
|
|
mhip->ip_off |= IP_MF;
|
|
mhip->ip_len = htons((u_short)(len + mhlen));
|
|
m->m_next = m_copym(m0, off, len, M_DONTWAIT);
|
|
if (m->m_next == 0) {
|
|
error = ENOBUFS; /* ??? */
|
|
goto sendorfree;
|
|
}
|
|
m->m_pkthdr.len = mhlen + len;
|
|
m_reset_rcvif(m);
|
|
mhip->ip_off = htons((u_short)mhip->ip_off);
|
|
mhip->ip_sum = 0;
|
|
#ifdef INET
|
|
mhip->ip_sum = in_cksum(m, mhlen);
|
|
#endif
|
|
*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_len);
|
|
ip->ip_len = htons((u_short)(hlen + firstlen));
|
|
ip->ip_off = htons((u_short)IP_MF);
|
|
ip->ip_sum = 0;
|
|
#ifdef INET
|
|
ip->ip_sum = in_cksum(m0, hlen);
|
|
#endif
|
|
sendorfree:
|
|
for (m = m0; m; m = m0) {
|
|
m0 = m->m_act;
|
|
m->m_act = 0;
|
|
if (error == 0) {
|
|
KERNEL_LOCK(1, NULL);
|
|
error = (*ifp->if_output)(ifp, m, dst, rt);
|
|
KERNEL_UNLOCK_ONE(NULL);
|
|
} else {
|
|
FREE_MB_T(m);
|
|
}
|
|
}
|
|
}
|
|
done:
|
|
if (!error)
|
|
softc->ipf_frouteok[0]++;
|
|
else
|
|
softc->ipf_frouteok[1]++;
|
|
|
|
# if __NetBSD_Version__ >= 499001100
|
|
rtcache_unref(rt, ro);
|
|
rtcache_free(ro);
|
|
# else
|
|
if (rt) {
|
|
RTFREE(rt);
|
|
}
|
|
# endif
|
|
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) ipf_send_icmp_err(ICMP_UNREACH, fin, 1);
|
|
fin->fin_ifp = sifp;
|
|
fin->fin_icode = code;
|
|
}
|
|
FREE_MB_T(m);
|
|
goto done;
|
|
#endif /* INET */
|
|
}
|
|
|
|
|
|
#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 (ipf_fastroute).
|
|
*/
|
|
static int
|
|
ipf_fastroute6(struct mbuf *m0, struct mbuf **mpp, fr_info_t *fin,
|
|
frdest_t *fdp)
|
|
{
|
|
# if __NetBSD_Version__ >= 499001100
|
|
struct route ip6route;
|
|
const struct sockaddr *dst;
|
|
union {
|
|
struct sockaddr dst;
|
|
struct sockaddr_in6 dst6;
|
|
} u;
|
|
struct route *ro;
|
|
# else
|
|
struct route_in6 ip6route;
|
|
struct sockaddr_in6 *dst6;
|
|
struct route_in6 *ro;
|
|
# endif
|
|
struct rtentry *rt;
|
|
struct ifnet *ifp;
|
|
u_long mtu;
|
|
int error;
|
|
|
|
error = 0;
|
|
ro = &ip6route;
|
|
|
|
if (fdp != NULL)
|
|
ifp = fdp->fd_ptr;
|
|
else
|
|
ifp = fin->fin_ifp;
|
|
memset(ro, 0, sizeof(*ro));
|
|
# if __NetBSD_Version__ >= 499001100
|
|
if (fdp != NULL && IP6_NOTZERO(&fdp->fd_ip6))
|
|
sockaddr_in6_init(&u.dst6, &fdp->fd_ip6.in6, 0, 0, 0);
|
|
else
|
|
sockaddr_in6_init(&u.dst6, &fin->fin_fi.fi_dst.in6, 0, 0, 0);
|
|
if ((error = in6_setscope(&u.dst6.sin6_addr, ifp,
|
|
&u.dst6.sin6_scope_id)) != 0)
|
|
return error;
|
|
if ((error = sa6_embedscope(&u.dst6, 0)) != 0)
|
|
return error;
|
|
|
|
dst = &u.dst;
|
|
rtcache_setdst(ro, dst);
|
|
|
|
rt = rtcache_init(ro);
|
|
if ((ifp == NULL) && (rt != NULL))
|
|
ifp = rt->rt_ifp;
|
|
# else
|
|
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;
|
|
/* KAME */
|
|
if (IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr))
|
|
dst6->sin6_addr.s6_addr16[1] = htons(ifp->if_index);
|
|
|
|
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;
|
|
rt = ro->ro_rt;
|
|
# endif
|
|
if ((rt == NULL) || (ifp == NULL)) {
|
|
|
|
error = EHOSTUNREACH;
|
|
goto bad;
|
|
}
|
|
|
|
{
|
|
# if (__NetBSD_Version__ >= 106010000) && !defined(IN6_LINKMTU) \
|
|
&& defined(IPV6CTL_ACCEPT_RTADV)
|
|
struct in6_ifextra *ife;
|
|
# endif
|
|
if (rt->rt_flags & RTF_GATEWAY)
|
|
# if __NetBSD_Version__ >= 499001100
|
|
dst = rt->rt_gateway;
|
|
# else
|
|
dst6 = (struct sockaddr_in6 *)rt->rt_gateway;
|
|
# endif
|
|
rt->rt_use++;
|
|
|
|
/* Determine path MTU. */
|
|
# if (__NetBSD_Version__ <= 106009999)
|
|
mtu = nd_ifinfo[ifp->if_index].linkmtu;
|
|
# elif defined(IPV6CTL_ACCEPT_RTADV)
|
|
# ifdef IN6_LINKMTU
|
|
mtu = IN6_LINKMTU(ifp);
|
|
# else
|
|
ife = (struct in6_ifextra *)(ifp)->if_afdata[AF_INET6];
|
|
mtu = ife->nd_ifinfo[ifp->if_index].linkmtu;
|
|
# endif
|
|
# else
|
|
mtu = ifp->if_mtu;
|
|
# endif
|
|
if ((error == 0) && (m0->m_pkthdr.len <= mtu)) {
|
|
# if __NetBSD_Version__ >= 499001100
|
|
error = ip6_if_output(ifp, ifp, m0, satocsin6(dst), rt);
|
|
# else
|
|
error = nd6_output(ifp, ifp, m0, dst6, rt);
|
|
# endif
|
|
if (error)
|
|
*mpp = NULL; /* m0 has been freed */
|
|
} else {
|
|
error = EMSGSIZE;
|
|
}
|
|
}
|
|
bad:
|
|
# if __NetBSD_Version__ >= 499001100
|
|
rtcache_unref(rt, ro);
|
|
rtcache_free(ro);
|
|
# else
|
|
if (ro->ro_rt != NULL) {
|
|
RTFREE(((struct route *)ro)->ro_rt);
|
|
}
|
|
# endif
|
|
return error;
|
|
}
|
|
#endif /* INET6 */
|
|
|
|
|
|
int
|
|
ipf_verifysrc(fr_info_t *fin)
|
|
{
|
|
#if __NetBSD_Version__ >= 499001100
|
|
union {
|
|
struct sockaddr dst;
|
|
struct sockaddr_in dst4;
|
|
} u;
|
|
struct rtentry *rt;
|
|
#else
|
|
struct sockaddr_in *dst;
|
|
#endif
|
|
struct route iproute;
|
|
int rc;
|
|
|
|
#if __NetBSD_Version__ >= 499001100
|
|
sockaddr_in_init(&u.dst4, &fin->fin_src, 0);
|
|
rtcache_setdst(&iproute, &u.dst);
|
|
rt = rtcache_init(&iproute);
|
|
if (rt == NULL)
|
|
rc = 0;
|
|
else
|
|
rc = (fin->fin_ifp == rt->rt_ifp);
|
|
rtcache_unref(rt, &iproute);
|
|
rtcache_free(&iproute);
|
|
#else
|
|
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;
|
|
rc = (fin->fin_ifp == iproute.ro_rt->rt_ifp);
|
|
RTFREE(iproute.ro_rt);
|
|
#endif
|
|
return rc;
|
|
}
|
|
|
|
|
|
/*
|
|
* return the first IP Address associated with an interface
|
|
*/
|
|
int
|
|
ipf_ifpaddr(ipf_main_softc_t *softc, int v, int atype, void *ifptr,
|
|
i6addr_t *inp, i6addr_t *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->in4.s_addr = 0;
|
|
#ifdef USE_INET6
|
|
else if (v == 6)
|
|
bzero((char *)inp, sizeof(*inp));
|
|
#endif
|
|
|
|
ifa = IFADDR_READER_FIRST(ifp);
|
|
sock = ifa ? ifa->ifa_addr : NULL;
|
|
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 = IFADDR_READER_NEXT(ifa);
|
|
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 ipf_ifpfillv6addr(atype, (struct sockaddr_in6 *)sock,
|
|
(struct sockaddr_in6 *)mask,
|
|
inp, inpmask);
|
|
#endif
|
|
return ipf_ifpfillv4addr(atype, (struct sockaddr_in *)sock,
|
|
(struct sockaddr_in *)mask,
|
|
&inp->in4, &inpmask->in4);
|
|
}
|
|
|
|
|
|
u_32_t
|
|
ipf_newisn(fr_info_t *fin)
|
|
{
|
|
#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);
|
|
else /* XXX: no way to return error */
|
|
return 0;
|
|
#ifdef INET
|
|
return tcp_new_iss1((void *)&fin->fin_src, (void *)&fin->fin_dst,
|
|
fin->fin_sport, fin->fin_dport, asz);
|
|
#else
|
|
return ENOSYS;
|
|
#endif
|
|
#else
|
|
static int iss_seq_off = 0;
|
|
u_char hash[16];
|
|
u_32_t newiss;
|
|
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;
|
|
return newiss;
|
|
#endif
|
|
}
|
|
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
/* Function: ipf_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
|
|
ipf_nextipid(fr_info_t *fin)
|
|
{
|
|
#ifdef USE_MUTEXES
|
|
ipf_main_softc_t *softc = fin->fin_main_soft;
|
|
#endif
|
|
u_short id;
|
|
|
|
MUTEX_ENTER(&softc->ipf_rw);
|
|
id = ipid++;
|
|
MUTEX_EXIT(&softc->ipf_rw);
|
|
|
|
return id;
|
|
}
|
|
|
|
|
|
EXTERN_INLINE int
|
|
ipf_checkv4sum(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 0;
|
|
|
|
if ((fin->fin_flx & FI_SHORT) != 0)
|
|
return 1;
|
|
|
|
if (fin->fin_cksum != FI_CK_NEEDED)
|
|
return (fin->fin_cksum > FI_CK_NEEDED) ? 0 : -1;
|
|
|
|
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;
|
|
fin->fin_cksum = FI_CK_BAD;
|
|
} else if (cflags == (pflag | M_CSUM_DATA)) {
|
|
if ((m->m_pkthdr.csum_data ^ 0xffff) != 0) {
|
|
fin->fin_flx |= FI_BAD;
|
|
fin->fin_cksum = FI_CK_BAD;
|
|
} else {
|
|
fin->fin_cksum = FI_CK_SUMOK;
|
|
}
|
|
} else if (cflags == pflag) {
|
|
fin->fin_cksum = FI_CK_SUMOK;
|
|
} else {
|
|
manual = 1;
|
|
}
|
|
}
|
|
skipauto:
|
|
if (manual != 0) {
|
|
if (ipf_checkl4sum(fin) == -1) {
|
|
fin->fin_flx |= FI_BAD;
|
|
return -1;
|
|
}
|
|
}
|
|
#else
|
|
if (ipf_checkl4sum(fin) == -1) {
|
|
fin->fin_flx |= FI_BAD;
|
|
return -1;
|
|
}
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
|
|
#ifdef USE_INET6
|
|
EXTERN_INLINE int
|
|
ipf_checkv6sum(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 0;
|
|
|
|
if ((fin->fin_flx & FI_SHORT) != 0)
|
|
return 1;
|
|
|
|
if (fin->fin_cksum != FI_CK_SUMOK)
|
|
return (fin->fin_cksum > FI_CK_NEEDED) ? 0 : -1;
|
|
|
|
|
|
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;
|
|
}
|
|
}
|
|
if (manual != 0) {
|
|
if (ipf_checkl4sum(fin) == -1) {
|
|
fin->fin_flx |= FI_BAD;
|
|
return -1;
|
|
}
|
|
}
|
|
# else
|
|
if (ipf_checkl4sum(fin) == -1) {
|
|
fin->fin_flx |= FI_BAD;
|
|
return -1;
|
|
}
|
|
# endif
|
|
return 0;
|
|
}
|
|
#endif /* USE_INET6 */
|
|
|
|
|
|
size_t
|
|
mbufchainlen(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;
|
|
}
|
|
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
/* Function: ipf_pullup */
|
|
/* Returns: NULL == pullup failed, else pointer to protocol header */
|
|
/* Parameters: xmin(I)- pointer to buffer where data packet starts */
|
|
/* fin(I) - pointer to packet information */
|
|
/* len(I) - number of bytes to pullup */
|
|
/* */
|
|
/* Attempt to move at least len bytes (from the start of the buffer) into a */
|
|
/* single buffer for ease of access. Operating system native functions are */
|
|
/* used to manage buffers - if necessary. If the entire packet ends up in */
|
|
/* a single buffer, set the FI_COALESCE flag even though ipf_coalesce() has */
|
|
/* not been called. Both fin_ip and fin_dp are updated before exiting _IF_ */
|
|
/* and ONLY if the pullup succeeds. */
|
|
/* */
|
|
/* We assume that 'xmin' is a pointer to a buffer that is part of the chain */
|
|
/* of buffers that starts at *fin->fin_mp. */
|
|
/* ------------------------------------------------------------------------ */
|
|
void *
|
|
ipf_pullup(mb_t *xmin, fr_info_t *fin, int len)
|
|
{
|
|
int dpoff, ipoff;
|
|
mb_t *m = xmin;
|
|
char *ip;
|
|
|
|
if (m == NULL)
|
|
return NULL;
|
|
|
|
ip = (char *)fin->fin_ip;
|
|
if ((fin->fin_flx & FI_COALESCE) != 0)
|
|
return ip;
|
|
|
|
ipoff = fin->fin_ipoff;
|
|
if (fin->fin_dp != NULL)
|
|
dpoff = (char *)fin->fin_dp - (char *)ip;
|
|
else
|
|
dpoff = 0;
|
|
|
|
if (M_LEN(m) < len) {
|
|
mb_t *n = *fin->fin_mp;
|
|
/*
|
|
* Assume that M_PKTHDR is set and just work with what is left
|
|
* rather than check..
|
|
* Should not make any real difference, anyway.
|
|
*/
|
|
if (m != n) {
|
|
/*
|
|
* Record the mbuf that points to the mbuf that we're
|
|
* about to go to work on so that we can update the
|
|
* m_next appropriately later.
|
|
*/
|
|
for (; n->m_next != m; n = n->m_next)
|
|
;
|
|
} else {
|
|
n = NULL;
|
|
}
|
|
|
|
#ifdef MHLEN
|
|
if (len > MHLEN)
|
|
#else
|
|
if (len > MLEN)
|
|
#endif
|
|
{
|
|
#ifdef HAVE_M_PULLDOWN
|
|
if (m_pulldown(m, 0, len, NULL) == NULL)
|
|
m = NULL;
|
|
#else
|
|
FREE_MB_T(*fin->fin_mp);
|
|
m = NULL;
|
|
n = NULL;
|
|
#endif
|
|
} else
|
|
{
|
|
m = m_pullup(m, len);
|
|
}
|
|
if (n != NULL)
|
|
n->m_next = m;
|
|
if (m == NULL) {
|
|
/*
|
|
* When n is non-NULL, it indicates that m pointed to
|
|
* a sub-chain (tail) of the mbuf and that the head
|
|
* of this chain has not yet been free'd.
|
|
*/
|
|
if (n != NULL) {
|
|
FREE_MB_T(*fin->fin_mp);
|
|
}
|
|
|
|
*fin->fin_mp = NULL;
|
|
fin->fin_m = NULL;
|
|
return NULL;
|
|
}
|
|
|
|
if (n == NULL)
|
|
*fin->fin_mp = m;
|
|
|
|
while (M_LEN(m) == 0) {
|
|
m = m->m_next;
|
|
}
|
|
fin->fin_m = m;
|
|
ip = MTOD(m, char *) + ipoff;
|
|
|
|
fin->fin_ip = (ip_t *)ip;
|
|
if (fin->fin_dp != NULL)
|
|
fin->fin_dp = (char *)fin->fin_ip + dpoff;
|
|
if (fin->fin_fraghdr != NULL)
|
|
fin->fin_fraghdr = (char *)ip +
|
|
((char *)fin->fin_fraghdr -
|
|
(char *)fin->fin_ip);
|
|
}
|
|
|
|
if (len == fin->fin_plen)
|
|
fin->fin_flx |= FI_COALESCE;
|
|
return ip;
|
|
}
|
|
|
|
|
|
int
|
|
ipf_inject(fr_info_t *fin, mb_t *m)
|
|
{
|
|
int error;
|
|
|
|
if (fin->fin_out == 0) {
|
|
if (__predict_false(!pktq_enqueue(ip_pktq, m, 0))) {
|
|
FREE_MB_T(m);
|
|
error = ENOBUFS;
|
|
} else {
|
|
error = 0;
|
|
}
|
|
} else {
|
|
error = ip_output(m, NULL, NULL, IP_FORWARDING, NULL, NULL);
|
|
}
|
|
return error;
|
|
}
|
|
|
|
|
|
u_32_t
|
|
ipf_random(void)
|
|
{
|
|
int number;
|
|
|
|
#ifdef _CPRNG_H
|
|
number = cprng_fast32();
|
|
#else
|
|
number = arc4random();
|
|
#endif
|
|
return number;
|
|
}
|
|
|
|
|
|
/*
|
|
* routines below for saving IP headers to buffer
|
|
*/
|
|
static int ipfopen(dev_t dev, int flags
|
|
#if (NetBSD >= 199511)
|
|
, int devtype, PROC_T *p
|
|
#endif
|
|
)
|
|
{
|
|
u_int unit = GET_MINOR(dev);
|
|
int error;
|
|
|
|
if (IPL_LOGMAX < unit) {
|
|
error = ENXIO;
|
|
} else {
|
|
switch (unit)
|
|
{
|
|
case IPL_LOGIPF :
|
|
case IPL_LOGNAT :
|
|
case IPL_LOGSTATE :
|
|
case IPL_LOGAUTH :
|
|
case IPL_LOGLOOKUP :
|
|
case IPL_LOGSYNC :
|
|
#ifdef IPFILTER_SCAN
|
|
case IPL_LOGSCAN :
|
|
#endif
|
|
error = 0;
|
|
break;
|
|
default :
|
|
error = ENXIO;
|
|
break;
|
|
}
|
|
}
|
|
#if (__NetBSD_Version__ >= 799003000)
|
|
if (error == 0) {
|
|
mutex_enter(&ipf_ref_mutex);
|
|
ipf_active = 1;
|
|
mutex_exit(&ipf_ref_mutex);
|
|
}
|
|
#endif
|
|
return error;
|
|
}
|
|
|
|
|
|
static int ipfclose(dev_t dev, int flags
|
|
#if (NetBSD >= 199511)
|
|
, int devtype, PROC_T *p
|
|
#endif
|
|
)
|
|
{
|
|
u_int unit = GET_MINOR(dev);
|
|
|
|
if (IPL_LOGMAX < unit)
|
|
return ENXIO;
|
|
else {
|
|
#if (__NetBSD_Version__ >= 799003000)
|
|
mutex_enter(&ipf_ref_mutex);
|
|
ipf_active = 0;
|
|
mutex_exit(&ipf_ref_mutex);
|
|
#endif
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* ipfread/ipflog
|
|
* 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.
|
|
*/
|
|
static int ipfread(dev_t dev, struct uio *uio, int ioflag)
|
|
{
|
|
|
|
if (ipfmain.ipf_running < 1) {
|
|
ipfmain.ipf_interror = 130006;
|
|
return EIO;
|
|
}
|
|
|
|
if (GET_MINOR(dev) == IPL_LOGSYNC)
|
|
return ipf_sync_read(&ipfmain, uio);
|
|
|
|
#ifdef IPFILTER_LOG
|
|
return ipf_log_read(&ipfmain, GET_MINOR(dev), uio);
|
|
#else
|
|
ipfmain.ipf_interror = 130007;
|
|
return ENXIO;
|
|
#endif
|
|
}
|
|
|
|
|
|
/*
|
|
* ipfwrite
|
|
* 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.
|
|
*/
|
|
static int ipfwrite(dev_t dev, struct uio *uio, int ioflag)
|
|
{
|
|
|
|
if (ipfmain.ipf_running < 1) {
|
|
ipfmain.ipf_interror = 130008;
|
|
return EIO;
|
|
}
|
|
|
|
if (GET_MINOR(dev) == IPL_LOGSYNC)
|
|
return ipf_sync_write(&ipfmain, uio);
|
|
ipfmain.ipf_interror = 130009;
|
|
return ENXIO;
|
|
}
|
|
|
|
|
|
static int ipfpoll(dev_t dev, int events, PROC_T *p)
|
|
{
|
|
u_int unit = GET_MINOR(dev);
|
|
int revents = 0;
|
|
|
|
if (IPL_LOGMAX < unit) {
|
|
ipfmain.ipf_interror = 130010;
|
|
return ENXIO;
|
|
}
|
|
|
|
switch (unit)
|
|
{
|
|
case IPL_LOGIPF :
|
|
case IPL_LOGNAT :
|
|
case IPL_LOGSTATE :
|
|
#ifdef IPFILTER_LOG
|
|
if ((events & (POLLIN | POLLRDNORM)) &&
|
|
ipf_log_canread(&ipfmain, unit))
|
|
revents |= events & (POLLIN | POLLRDNORM);
|
|
#endif
|
|
break;
|
|
case IPL_LOGAUTH :
|
|
if ((events & (POLLIN | POLLRDNORM)) &&
|
|
ipf_auth_waiting(&ipfmain))
|
|
revents |= events & (POLLIN | POLLRDNORM);
|
|
break;
|
|
case IPL_LOGSYNC :
|
|
if ((events & (POLLIN | POLLRDNORM)) &&
|
|
ipf_sync_canread(&ipfmain))
|
|
revents |= events & (POLLIN | POLLRDNORM);
|
|
if ((events & (POLLOUT | POLLWRNORM)) &&
|
|
ipf_sync_canwrite(&ipfmain))
|
|
revents |= events & (POLLOUT | POLLWRNORM);
|
|
break;
|
|
case IPL_LOGSCAN :
|
|
case IPL_LOGLOOKUP :
|
|
default :
|
|
break;
|
|
}
|
|
|
|
if ((revents == 0) && (((events & (POLLIN|POLLRDNORM)) != 0)))
|
|
selrecord(p, &ipfmain.ipf_selwait[unit]);
|
|
return revents;
|
|
}
|
|
|
|
u_int
|
|
ipf_pcksum(fr_info_t *fin, int hlen, u_int sum)
|
|
{
|
|
struct mbuf *m;
|
|
u_int sum2;
|
|
int off;
|
|
|
|
m = fin->fin_m;
|
|
off = (char *)fin->fin_dp - (char *)fin->fin_ip;
|
|
m->m_data += hlen;
|
|
m->m_len -= hlen;
|
|
sum2 = in_cksum(fin->fin_m, fin->fin_plen - off);
|
|
m->m_len += hlen;
|
|
m->m_data -= hlen;
|
|
|
|
/*
|
|
* Both sum and sum2 are partial sums, so combine them together.
|
|
*/
|
|
sum += ~sum2 & 0xffff;
|
|
while (sum > 0xffff)
|
|
sum = (sum & 0xffff) + (sum >> 16);
|
|
sum2 = ~sum & 0xffff;
|
|
return sum2;
|
|
}
|
|
|
|
#if (__NetBSD_Version__ >= 799003000)
|
|
|
|
/* NetBSD module interface */
|
|
|
|
MODULE(MODULE_CLASS_DRIVER, ipl, "bpf_filter");
|
|
|
|
static int ipl_init(void *);
|
|
static int ipl_fini(void *);
|
|
static int ipl_modcmd(modcmd_t, void *);
|
|
|
|
#ifdef _MODULE
|
|
static devmajor_t ipl_cmaj = -1, ipl_bmaj = -1;
|
|
#endif
|
|
|
|
static int
|
|
ipl_modcmd(modcmd_t cmd, void *opaque)
|
|
{
|
|
|
|
switch (cmd) {
|
|
case MODULE_CMD_INIT:
|
|
return ipl_init(opaque);
|
|
case MODULE_CMD_FINI:
|
|
return ipl_fini(opaque);
|
|
default:
|
|
return ENOTTY;
|
|
}
|
|
}
|
|
|
|
static int
|
|
ipl_init(void *opaque)
|
|
{
|
|
int error;
|
|
|
|
ipf_listener = kauth_listen_scope(KAUTH_SCOPE_NETWORK,
|
|
ipf_listener_cb, NULL);
|
|
|
|
if ((error = ipf_load_all()) != 0)
|
|
return error;
|
|
|
|
if (ipf_create_all(&ipfmain) == NULL) {
|
|
ipf_unload_all();
|
|
return ENODEV;
|
|
}
|
|
|
|
/* Initialize our mutex and reference count */
|
|
mutex_init(&ipf_ref_mutex, MUTEX_DEFAULT, IPL_NONE);
|
|
ipf_active = 0;
|
|
|
|
#ifdef _MODULE
|
|
/*
|
|
* Insert ourself into the cdevsw list.
|
|
*/
|
|
error = devsw_attach("ipl", NULL, &ipl_bmaj, &ipl_cdevsw, &ipl_cmaj);
|
|
if (error)
|
|
ipl_fini(opaque);
|
|
#endif
|
|
|
|
return error;
|
|
}
|
|
|
|
static int
|
|
ipl_fini(void *opaque)
|
|
{
|
|
|
|
#ifdef _MODULE
|
|
devsw_detach(NULL, &ipl_cdevsw);
|
|
#endif
|
|
|
|
/*
|
|
* Grab the mutex, verify that there are no references
|
|
* and that there are no running filters. If either
|
|
* of these exists, reinsert our cdevsw entry and return
|
|
* an error.
|
|
*/
|
|
mutex_enter(&ipf_ref_mutex);
|
|
if (ipf_active != 0 || ipfmain.ipf_running > 0) {
|
|
#ifdef _MODULE
|
|
(void)devsw_attach("ipl", NULL, &ipl_bmaj,
|
|
&ipl_cdevsw, &ipl_cmaj);
|
|
#endif
|
|
mutex_exit(&ipf_ref_mutex);
|
|
return EBUSY;
|
|
}
|
|
|
|
/* Clean up the rest of our state before being unloaded */
|
|
|
|
mutex_exit(&ipf_ref_mutex);
|
|
mutex_destroy(&ipf_ref_mutex);
|
|
ipf_destroy_all(&ipfmain);
|
|
ipf_unload_all();
|
|
kauth_unlisten_scope(ipf_listener);
|
|
|
|
return 0;
|
|
}
|
|
#endif /* (__NetBSD_Version__ >= 799003000) */
|