mirror of
https://github.com/freebsd/freebsd-src
synced 2024-09-06 17:18:32 +00:00
![Kristof Provost](/assets/img/avatar_default.png)
pfil hooks (i.e. firewalls) may pass, modify or free the mbuf passed to them. (E.g. when rejecting a packet, or when gathering up packets for reassembly). If the hook returns PFIL_PASS the mbuf must still be present. Assert this in pfil_mem_common() and ensure that ipfilter follows this convention. pf and ipfw already did. Similarly, if the hook returns PFIL_DROPPED or PFIL_CONSUMED the mbuf must have been freed (or now be owned by the firewall for further processing, like packet scheduling or reassembly). This allows us to remove a few extraneous NULL checks. Suggested by: tuexen Reviewed by: tuexen, zlei Sponsored by: Rubicon Communications, LLC ("Netgate") Differential Revision: https://reviews.freebsd.org/D43617
1463 lines
31 KiB
C
1463 lines
31 KiB
C
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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(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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#if defined(__FreeBSD__) && \
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!defined(KLD_MODULE) && !defined(IPFILTER_LKM)
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# include "opt_inet6.h"
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#endif
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#include <sys/param.h>
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#include <sys/eventhandler.h>
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#include <sys/conf.h>
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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/fcntl.h>
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#include <sys/filio.h>
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#include <sys/time.h>
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#include <sys/systm.h>
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#include <sys/dirent.h>
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#if defined(__FreeBSD__)
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# include <sys/jail.h>
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#endif
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/sockopt.h>
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#include <sys/socket.h>
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#include <sys/selinfo.h>
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#include <net/if.h>
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#include <net/if_var.h>
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#include <net/netisr.h>
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#include <net/route.h>
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#include <net/route/nhop.h>
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#include <netinet/in.h>
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#include <netinet/in_fib.h>
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#include <netinet/in_pcb.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/tcp_var.h>
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#include <net/vnet.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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#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 "netinet/ip_pool.h"
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#include <sys/malloc.h>
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#include <sys/kernel.h>
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#ifdef CSUM_DATA_VALID
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# include <machine/in_cksum.h>
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#endif
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extern int ip_optcopy(struct ip *, struct ip *);
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#ifdef IPFILTER_M_IPFILTER
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MALLOC_DEFINE(M_IPFILTER, "ipfilter", "IP Filter packet filter data structures");
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#endif
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static int ipf_send_ip(fr_info_t *, mb_t *);
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static void ipf_timer_func(void *arg);
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VNET_DEFINE(ipf_main_softc_t, ipfmain) = {
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.ipf_running = -2,
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};
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#define V_ipfmain VNET(ipfmain)
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#include <sys/conf.h>
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#include <net/pfil.h>
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VNET_DEFINE_STATIC(eventhandler_tag, ipf_arrivetag);
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VNET_DEFINE_STATIC(eventhandler_tag, ipf_departtag);
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#define V_ipf_arrivetag VNET(ipf_arrivetag)
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#define V_ipf_departtag VNET(ipf_departtag)
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#if 0
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/*
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* Disable the "cloner" event handler; we are getting interface
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* events before the firewall is fully initiallized and also no vnet
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* information thus leading to uninitialised memory accesses.
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* In addition it is unclear why we need it in first place.
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* If it turns out to be needed, well need a dedicated event handler
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* for it to deal with the ifc and the correct vnet.
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*/
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VNET_DEFINE_STATIC(eventhandler_tag, ipf_clonetag);
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#define V_ipf_clonetag VNET(ipf_clonetag)
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#endif
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static void ipf_ifevent(void *arg, struct ifnet *ifp);
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static void ipf_ifevent(void *arg, struct ifnet *ifp)
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{
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CURVNET_SET(ifp->if_vnet);
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if (V_ipfmain.ipf_running > 0)
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ipf_sync(&V_ipfmain, NULL);
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CURVNET_RESTORE();
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}
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static pfil_return_t
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ipf_check_wrapper(struct mbuf **mp, struct ifnet *ifp, int flags,
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void *ruleset __unused, struct inpcb *inp)
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{
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struct ip *ip = mtod(*mp, struct ip *);
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pfil_return_t rv;
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CURVNET_SET(ifp->if_vnet);
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rv = ipf_check(&V_ipfmain, ip, ip->ip_hl << 2, ifp,
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!!(flags & PFIL_OUT), mp);
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CURVNET_RESTORE();
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if (rv == 0 && *mp == NULL)
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return (PFIL_CONSUMED);
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return (rv == 0 ? PFIL_PASS : PFIL_DROPPED);
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}
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#ifdef USE_INET6
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static pfil_return_t
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ipf_check_wrapper6(struct mbuf **mp, struct ifnet *ifp, int flags,
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void *ruleset __unused, struct inpcb *inp)
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{
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pfil_return_t rv;
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CURVNET_SET(ifp->if_vnet);
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rv = ipf_check(&V_ipfmain, mtod(*mp, struct ip *),
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sizeof(struct ip6_hdr), ifp, !!(flags & PFIL_OUT), mp);
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CURVNET_RESTORE();
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if (rv == 0 && *mp == NULL)
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return (PFIL_CONSUMED);
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return (rv == 0 ? PFIL_PASS : PFIL_DROPPED);
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}
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# endif
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#if defined(IPFILTER_LKM)
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int ipf_identify(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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static void
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ipf_timer_func(void *arg)
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{
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ipf_main_softc_t *softc = arg;
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SPL_INT(s);
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SPL_NET(s);
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READ_ENTER(&softc->ipf_global);
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if (softc->ipf_running > 0)
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ipf_slowtimer(softc);
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if (softc->ipf_running == -1 || softc->ipf_running == 1) {
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#if 0
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softc->ipf_slow_ch = timeout(ipf_timer_func, softc, hz/2);
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#endif
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callout_init(&softc->ipf_slow_ch, 1);
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callout_reset(&softc->ipf_slow_ch,
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(hz / IPF_HZ_DIVIDE) * IPF_HZ_MULT,
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ipf_timer_func, softc);
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}
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RWLOCK_EXIT(&softc->ipf_global);
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SPL_X(s);
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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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#ifdef USE_SPL
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int s;
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#endif
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SPL_NET(s);
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if (softc->ipf_running > 0) {
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SPL_X(s);
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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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return (EIO);
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}
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bzero((char *)V_ipfmain.ipf_selwait, sizeof(V_ipfmain.ipf_selwait));
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softc->ipf_running = 1;
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if (softc->ipf_control_forwarding & 1)
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V_ipforwarding = 1;
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SPL_X(s);
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#if 0
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softc->ipf_slow_ch = timeout(ipf_timer_func, softc,
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(hz / IPF_HZ_DIVIDE) * IPF_HZ_MULT);
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#endif
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callout_init(&softc->ipf_slow_ch, 1);
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callout_reset(&softc->ipf_slow_ch, (hz / IPF_HZ_DIVIDE) * IPF_HZ_MULT,
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ipf_timer_func, softc);
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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
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ipfdetach(ipf_main_softc_t *softc)
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{
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#ifdef USE_SPL
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int s;
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#endif
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if (softc->ipf_control_forwarding & 2)
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V_ipforwarding = 0;
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SPL_NET(s);
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#if 0
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if (softc->ipf_slow_ch.callout != NULL)
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untimeout(ipf_timer_func, softc, softc->ipf_slow_ch);
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bzero(&softc->ipf_slow, sizeof(softc->ipf_slow));
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#endif
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callout_drain(&softc->ipf_slow_ch);
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ipf_fini_all(softc);
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softc->ipf_running = -2;
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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
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ipfioctl(struct cdev *dev, ioctlcmd_t cmd, caddr_t data,
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int mode, struct thread *p)
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#define p_cred td_ucred
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#define p_uid td_ucred->cr_ruid
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{
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int error = 0, unit = 0;
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SPL_INT(s);
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CURVNET_SET(TD_TO_VNET(p));
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if (securelevel_ge(p->p_cred, 3) && (mode & FWRITE))
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{
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V_ipfmain.ipf_interror = 130001;
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CURVNET_RESTORE();
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return (EPERM);
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}
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if (jailed_without_vnet(p->p_cred)) {
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V_ipfmain.ipf_interror = 130018;
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CURVNET_RESTORE();
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return (EOPNOTSUPP);
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}
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unit = GET_MINOR(dev);
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if ((IPL_LOGMAX < unit) || (unit < 0)) {
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V_ipfmain.ipf_interror = 130002;
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CURVNET_RESTORE();
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return (ENXIO);
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}
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if (V_ipfmain.ipf_running <= 0) {
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if (unit != IPL_LOGIPF && cmd != SIOCIPFINTERROR) {
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V_ipfmain.ipf_interror = 130003;
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CURVNET_RESTORE();
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return (EIO);
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}
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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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cmd != SIOCIPFINTERROR) {
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V_ipfmain.ipf_interror = 130004;
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CURVNET_RESTORE();
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return (EIO);
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}
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}
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SPL_NET(s);
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error = ipf_ioctlswitch(&V_ipfmain, unit, data, cmd, mode, p->p_uid, p);
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CURVNET_RESTORE();
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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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SPL_X(s);
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return (error);
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}
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/*
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* ipf_send_reset - this could conceivably be a call to tcp_respond(), but that
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* requires a large amount of setting up and isn't any more efficient.
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*/
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int
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ipf_send_reset(fr_info_t *fin)
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{
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struct tcphdr *tcp, *tcp2;
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int tlen = 0, hlen;
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struct mbuf *m;
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#ifdef USE_INET6
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ip6_t *ip6;
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#endif
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ip_t *ip;
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tcp = fin->fin_dp;
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if (tcp->th_flags & TH_RST)
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return (-1); /* feedback loop */
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if (ipf_checkl4sum(fin) == -1)
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return (-1);
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tlen = fin->fin_dlen - (TCP_OFF(tcp) << 2) +
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((tcp->th_flags & TH_SYN) ? 1 : 0) +
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((tcp->th_flags & TH_FIN) ? 1 : 0);
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#ifdef USE_INET6
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hlen = (fin->fin_v == 6) ? sizeof(ip6_t) : sizeof(ip_t);
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#else
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hlen = sizeof(ip_t);
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#endif
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#ifdef MGETHDR
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MGETHDR(m, M_NOWAIT, MT_HEADER);
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#else
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MGET(m, M_NOWAIT, MT_HEADER);
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#endif
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if (m == NULL)
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return (-1);
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if (sizeof(*tcp2) + hlen > MLEN) {
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if (!(MCLGET(m, M_NOWAIT))) {
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FREE_MB_T(m);
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return (-1);
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}
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}
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m->m_len = sizeof(*tcp2) + hlen;
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m->m_data += max_linkhdr;
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m->m_pkthdr.len = m->m_len;
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m->m_pkthdr.rcvif = (struct ifnet *)0;
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ip = mtod(m, struct ip *);
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bzero((char *)ip, hlen);
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#ifdef USE_INET6
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ip6 = (ip6_t *)ip;
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#endif
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tcp2 = (struct tcphdr *)((char *)ip + hlen);
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tcp2->th_sport = tcp->th_dport;
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tcp2->th_dport = tcp->th_sport;
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if (tcp_get_flags(tcp) & TH_ACK) {
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tcp2->th_seq = tcp->th_ack;
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tcp_set_flags(tcp2, TH_RST);
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tcp2->th_ack = 0;
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} else {
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tcp2->th_seq = 0;
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tcp2->th_ack = ntohl(tcp->th_seq);
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tcp2->th_ack += tlen;
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tcp2->th_ack = htonl(tcp2->th_ack);
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tcp_set_flags(tcp2, TH_RST|TH_ACK);
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}
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TCP_OFF_A(tcp2, sizeof(*tcp2) >> 2);
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tcp2->th_win = tcp->th_win;
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tcp2->th_sum = 0;
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tcp2->th_urp = 0;
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#ifdef USE_INET6
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if (fin->fin_v == 6) {
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ip6->ip6_flow = ((ip6_t *)fin->fin_ip)->ip6_flow;
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ip6->ip6_plen = htons(sizeof(struct tcphdr));
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ip6->ip6_nxt = IPPROTO_TCP;
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ip6->ip6_hlim = 0;
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ip6->ip6_src = fin->fin_dst6.in6;
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ip6->ip6_dst = fin->fin_src6.in6;
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tcp2->th_sum = in6_cksum(m, IPPROTO_TCP,
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sizeof(*ip6), sizeof(*tcp2));
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return (ipf_send_ip(fin, m));
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}
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#endif
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ip->ip_p = IPPROTO_TCP;
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ip->ip_len = htons(sizeof(struct tcphdr));
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ip->ip_src.s_addr = fin->fin_daddr;
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ip->ip_dst.s_addr = fin->fin_saddr;
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tcp2->th_sum = in_cksum(m, hlen + sizeof(*tcp2));
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ip->ip_len = htons(hlen + sizeof(*tcp2));
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return (ipf_send_ip(fin, m));
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}
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/*
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* ip_len must be in network byte order when called.
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*/
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static int
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ipf_send_ip(fr_info_t *fin, mb_t *m)
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{
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fr_info_t fnew;
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ip_t *ip, *oip;
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int hlen;
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ip = mtod(m, ip_t *);
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bzero((char *)&fnew, sizeof(fnew));
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fnew.fin_main_soft = fin->fin_main_soft;
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IP_V_A(ip, fin->fin_v);
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switch (fin->fin_v)
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{
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case 4 :
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oip = fin->fin_ip;
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hlen = sizeof(*oip);
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fnew.fin_v = 4;
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fnew.fin_p = ip->ip_p;
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fnew.fin_plen = ntohs(ip->ip_len);
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IP_HL_A(ip, sizeof(*oip) >> 2);
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ip->ip_tos = oip->ip_tos;
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ip->ip_id = fin->fin_ip->ip_id;
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ip->ip_off = htons(V_path_mtu_discovery ? IP_DF : 0);
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ip->ip_ttl = V_ip_defttl;
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ip->ip_sum = 0;
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break;
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#ifdef USE_INET6
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case 6 :
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{
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ip6_t *ip6 = (ip6_t *)ip;
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ip6->ip6_vfc = 0x60;
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ip6->ip6_hlim = IPDEFTTL;
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hlen = sizeof(*ip6);
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fnew.fin_p = ip6->ip6_nxt;
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fnew.fin_v = 6;
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fnew.fin_plen = ntohs(ip6->ip6_plen) + hlen;
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break;
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}
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#endif
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default :
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return (EINVAL);
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}
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#ifdef IPSEC_SUPPORT
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m->m_pkthdr.rcvif = NULL;
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#endif
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fnew.fin_ifp = fin->fin_ifp;
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fnew.fin_flx = FI_NOCKSUM;
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fnew.fin_m = m;
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fnew.fin_ip = ip;
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fnew.fin_mp = &m;
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fnew.fin_hlen = hlen;
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|
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, code;
|
|
struct in_addr dst4;
|
|
struct icmp *icmp;
|
|
struct mbuf *m;
|
|
i6addr_t dst6;
|
|
void *ifp;
|
|
#ifdef USE_INET6
|
|
ip6_t *ip6;
|
|
#endif
|
|
ip_t *ip, *ip2;
|
|
|
|
if ((type < 0) || (type >= ICMP_MAXTYPE))
|
|
return (-1);
|
|
|
|
code = fin->fin_icode;
|
|
#ifdef USE_INET6
|
|
/* See NetBSD ip_fil_netbsd.c r1.4: */
|
|
if ((code < 0) || (code >= sizeof(icmptoicmp6unreach)/sizeof(int)))
|
|
return (-1);
|
|
#endif
|
|
|
|
if (ipf_checkl4sum(fin) == -1)
|
|
return (-1);
|
|
#ifdef MGETHDR
|
|
MGETHDR(m, M_NOWAIT, MT_HEADER);
|
|
#else
|
|
MGET(m, M_NOWAIT, 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(&V_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) {
|
|
if (!(MCLGET(m, M_NOWAIT))) {
|
|
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) {
|
|
if (ipf_ifpaddr(&V_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->m_pkthdr.rcvif = (struct ifnet *)0;
|
|
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);
|
|
|
|
#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 = htons(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;
|
|
int len, off, error = 0, hlen, code;
|
|
struct ifnet *ifp, *sifp;
|
|
struct route ro;
|
|
struct sockaddr_in *dst;
|
|
const struct sockaddr *gw;
|
|
struct nhop_object *nh;
|
|
u_long fibnum = 0;
|
|
u_short ip_off;
|
|
frdest_t node;
|
|
frentry_t *fr;
|
|
|
|
#ifdef M_WRITABLE
|
|
/*
|
|
* HOT FIX/KLUDGE:
|
|
*
|
|
* If the mbuf we're about to send is not writable (because of
|
|
* a cluster reference, for example) we'll need to make a copy
|
|
* of it since this routine modifies the contents.
|
|
*
|
|
* If you have non-crappy network hardware that can transmit data
|
|
* from the mbuf, rather than making a copy, this is gonna be a
|
|
* problem.
|
|
*/
|
|
if (M_WRITABLE(m) == 0) {
|
|
m0 = m_dup(m, M_NOWAIT);
|
|
if (m0 != NULL) {
|
|
FREE_MB_T(m);
|
|
m = m0;
|
|
*mpp = m;
|
|
} else {
|
|
error = ENOBUFS;
|
|
FREE_MB_T(m);
|
|
goto done;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#ifdef USE_INET6
|
|
if (fin->fin_v == 6) {
|
|
/*
|
|
* currently "to <if>" and "to <if>:ip#" are not supported
|
|
* for IPv6
|
|
*/
|
|
return (ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL));
|
|
}
|
|
#endif
|
|
|
|
hlen = fin->fin_hlen;
|
|
ip = mtod(m0, struct ip *);
|
|
ifp = NULL;
|
|
|
|
/*
|
|
* Route packet.
|
|
*/
|
|
bzero(&ro, sizeof (ro));
|
|
dst = (struct sockaddr_in *)&ro.ro_dst;
|
|
dst->sin_family = AF_INET;
|
|
dst->sin_addr = ip->ip_dst;
|
|
dst->sin_len = sizeof(dst);
|
|
gw = (const struct sockaddr *)dst;
|
|
|
|
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 ((fdp != NULL) && (fdp->fd_ip.s_addr != 0))
|
|
dst->sin_addr = fdp->fd_ip;
|
|
|
|
fibnum = M_GETFIB(m0);
|
|
NET_EPOCH_ASSERT();
|
|
nh = fib4_lookup(fibnum, dst->sin_addr, 0, NHR_NONE, 0);
|
|
if (nh == NULL) {
|
|
if (in_localaddr(ip->ip_dst))
|
|
error = EHOSTUNREACH;
|
|
else
|
|
error = ENETUNREACH;
|
|
goto bad;
|
|
}
|
|
|
|
if (ifp == NULL)
|
|
ifp = nh->nh_ifp;
|
|
if (nh->nh_flags & NHF_GATEWAY) {
|
|
gw = &nh->gw_sa;
|
|
ro.ro_flags |= RT_HAS_GW;
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
if (ntohs(ip->ip_len) <= ifp->if_mtu) {
|
|
if (!ip->ip_sum)
|
|
ip->ip_sum = in_cksum(m, hlen);
|
|
error = (*ifp->if_output)(ifp, m, gw, &ro);
|
|
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 < ntohs(ip->ip_len); off += len) {
|
|
#ifdef MGETHDR
|
|
MGETHDR(m, M_NOWAIT, MT_HEADER);
|
|
#else
|
|
MGET(m, M_NOWAIT, MT_HEADER);
|
|
#endif
|
|
if (m == NULL) {
|
|
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 >= ntohs(ip->ip_len))
|
|
len = ntohs(ip->ip_len) - off;
|
|
else
|
|
mhip->ip_off |= IP_MF;
|
|
mhip->ip_len = htons((u_short)(len + mhlen));
|
|
*mnext = m;
|
|
m->m_next = m_copym(m0, off, len, M_NOWAIT);
|
|
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->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, gw, &ro);
|
|
else
|
|
FREE_MB_T(m);
|
|
}
|
|
}
|
|
done:
|
|
if (!error)
|
|
V_ipfmain.ipf_frouteok[0]++;
|
|
else
|
|
V_ipfmain.ipf_frouteok[1]++;
|
|
|
|
return (0);
|
|
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;
|
|
}
|
|
|
|
|
|
int
|
|
ipf_verifysrc(fr_info_t *fin)
|
|
{
|
|
struct nhop_object *nh;
|
|
|
|
NET_EPOCH_ASSERT();
|
|
nh = fib4_lookup(RT_DEFAULT_FIB, fin->fin_src, 0, NHR_NONE, 0);
|
|
if (nh == NULL)
|
|
return (0);
|
|
return (fin->fin_ifp == nh->nh_ifp);
|
|
}
|
|
|
|
|
|
/*
|
|
* 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 *ia6 = NULL;
|
|
#endif
|
|
struct sockaddr *sock, *mask;
|
|
struct sockaddr_in *sin;
|
|
struct ifaddr *ifa;
|
|
struct ifnet *ifp;
|
|
|
|
if ((ifptr == NULL) || (ifptr == (void *)-1))
|
|
return (-1);
|
|
|
|
sin = NULL;
|
|
ifp = ifptr;
|
|
|
|
if (v == 4)
|
|
inp->in4.s_addr = 0;
|
|
#ifdef USE_INET6
|
|
else if (v == 6)
|
|
bzero((char *)inp, sizeof(*inp));
|
|
#endif
|
|
ifa = CK_STAILQ_FIRST(&ifp->if_addrhead);
|
|
|
|
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)) {
|
|
ia6 = &((struct sockaddr_in6 *)sin)->sin6_addr;
|
|
if (!IN6_IS_ADDR_LINKLOCAL(ia6) &&
|
|
!IN6_IS_ADDR_LOOPBACK(ia6))
|
|
break;
|
|
}
|
|
#endif
|
|
ifa = CK_STAILQ_NEXT(ifa, ifa_link);
|
|
if (ifa != NULL)
|
|
sock = ifa->ifa_addr;
|
|
}
|
|
|
|
if (ifa == NULL || sin == NULL)
|
|
return (-1);
|
|
|
|
mask = ifa->ifa_netmask;
|
|
if (atype == FRI_BROADCAST)
|
|
sock = ifa->ifa_broadaddr;
|
|
else if (atype == FRI_PEERADDR)
|
|
sock = ifa->ifa_dstaddr;
|
|
|
|
if (sock == NULL)
|
|
return (-1);
|
|
|
|
#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)
|
|
{
|
|
u_32_t newiss;
|
|
newiss = arc4random();
|
|
return (newiss);
|
|
}
|
|
|
|
|
|
int
|
|
ipf_checkv4sum(fr_info_t *fin)
|
|
{
|
|
#ifdef CSUM_DATA_VALID
|
|
int manual = 0;
|
|
u_short sum;
|
|
ip_t *ip;
|
|
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;
|
|
|
|
m = fin->fin_m;
|
|
if (m == NULL) {
|
|
manual = 1;
|
|
goto skipauto;
|
|
}
|
|
ip = fin->fin_ip;
|
|
|
|
if ((m->m_pkthdr.csum_flags & (CSUM_IP_CHECKED|CSUM_IP_VALID)) ==
|
|
CSUM_IP_CHECKED) {
|
|
fin->fin_cksum = FI_CK_BAD;
|
|
fin->fin_flx |= FI_BAD;
|
|
DT2(ipf_fi_bad_checkv4sum_csum_ip_checked, fr_info_t *, fin, u_int, m->m_pkthdr.csum_flags & (CSUM_IP_CHECKED|CSUM_IP_VALID));
|
|
return (-1);
|
|
}
|
|
if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
|
|
/* Depending on the driver, UDP may have zero checksum */
|
|
if (fin->fin_p == IPPROTO_UDP && (fin->fin_flx &
|
|
(FI_FRAG|FI_SHORT|FI_BAD)) == 0) {
|
|
udphdr_t *udp = fin->fin_dp;
|
|
if (udp->uh_sum == 0) {
|
|
/*
|
|
* we're good no matter what the hardware
|
|
* checksum flags and csum_data say (handling
|
|
* of csum_data for zero UDP checksum is not
|
|
* consistent across all drivers)
|
|
*/
|
|
fin->fin_cksum = 1;
|
|
return (0);
|
|
}
|
|
}
|
|
|
|
if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
|
|
sum = m->m_pkthdr.csum_data;
|
|
else
|
|
sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr,
|
|
htonl(m->m_pkthdr.csum_data +
|
|
fin->fin_dlen + fin->fin_p));
|
|
sum ^= 0xffff;
|
|
if (sum != 0) {
|
|
fin->fin_cksum = FI_CK_BAD;
|
|
fin->fin_flx |= FI_BAD;
|
|
DT2(ipf_fi_bad_checkv4sum_sum, fr_info_t *, fin, u_int, sum);
|
|
} else {
|
|
fin->fin_cksum = FI_CK_SUMOK;
|
|
return (0);
|
|
}
|
|
} else {
|
|
if (m->m_pkthdr.csum_flags == CSUM_DELAY_DATA) {
|
|
fin->fin_cksum = FI_CK_L4FULL;
|
|
return (0);
|
|
} else if (m->m_pkthdr.csum_flags == CSUM_TCP ||
|
|
m->m_pkthdr.csum_flags == CSUM_UDP ||
|
|
m->m_pkthdr.csum_flags == CSUM_IP) {
|
|
fin->fin_cksum = FI_CK_L4PART;
|
|
return (0);
|
|
} else {
|
|
manual = 1;
|
|
}
|
|
}
|
|
skipauto:
|
|
if (manual != 0) {
|
|
if (ipf_checkl4sum(fin) == -1) {
|
|
fin->fin_flx |= FI_BAD;
|
|
DT2(ipf_fi_bad_checkv4sum_manual, fr_info_t *, fin, u_int, manual);
|
|
return (-1);
|
|
}
|
|
}
|
|
#else
|
|
if (ipf_checkl4sum(fin) == -1) {
|
|
fin->fin_flx |= FI_BAD;
|
|
DT2(ipf_fi_bad_checkv4sum_checkl4sum, fr_info_t *, fin, u_int, -1);
|
|
return (-1);
|
|
}
|
|
#endif
|
|
return (0);
|
|
}
|
|
|
|
|
|
#ifdef USE_INET6
|
|
int
|
|
ipf_checkv6sum(fr_info_t *fin)
|
|
{
|
|
if ((fin->fin_flx & FI_NOCKSUM) != 0) {
|
|
DT(ipf_checkv6sum_fi_nocksum);
|
|
return (0);
|
|
}
|
|
|
|
if ((fin->fin_flx & FI_SHORT) != 0) {
|
|
DT(ipf_checkv6sum_fi_short);
|
|
return (1);
|
|
}
|
|
|
|
if (fin->fin_cksum != FI_CK_NEEDED) {
|
|
DT(ipf_checkv6sum_fi_ck_needed);
|
|
return (fin->fin_cksum > FI_CK_NEEDED) ? 0 : -1;
|
|
}
|
|
|
|
if (ipf_checkl4sum(fin) == -1) {
|
|
fin->fin_flx |= FI_BAD;
|
|
DT2(ipf_fi_bad_checkv6sum_checkl4sum, fr_info_t *, fin, u_int, -1);
|
|
return (-1);
|
|
}
|
|
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. */
|
|
/* ------------------------------------------------------------------------ */
|
|
ip_t *
|
|
ipf_pullup(mb_t *xmin, fr_info_t *fin, int len)
|
|
{
|
|
int dpoff, ipoff;
|
|
mb_t *m = xmin;
|
|
ip_t *ip;
|
|
|
|
if (m == NULL)
|
|
return (NULL);
|
|
|
|
ip = 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, ip_t *) + ipoff;
|
|
|
|
fin->fin_ip = 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)
|
|
{
|
|
struct epoch_tracker et;
|
|
int error = 0;
|
|
|
|
NET_EPOCH_ENTER(et);
|
|
if (fin->fin_out == 0) {
|
|
netisr_dispatch(NETISR_IP, m);
|
|
} else {
|
|
fin->fin_ip->ip_len = ntohs(fin->fin_ip->ip_len);
|
|
fin->fin_ip->ip_off = ntohs(fin->fin_ip->ip_off);
|
|
error = ip_output(m, NULL, NULL, IP_FORWARDING, NULL, NULL);
|
|
}
|
|
NET_EPOCH_EXIT(et);
|
|
|
|
return (error);
|
|
}
|
|
|
|
VNET_DEFINE_STATIC(pfil_hook_t, ipf_inet_hook);
|
|
VNET_DEFINE_STATIC(pfil_hook_t, ipf_inet6_hook);
|
|
#define V_ipf_inet_hook VNET(ipf_inet_hook)
|
|
#define V_ipf_inet6_hook VNET(ipf_inet6_hook)
|
|
|
|
int ipf_pfil_unhook(void) {
|
|
|
|
pfil_remove_hook(V_ipf_inet_hook);
|
|
|
|
#ifdef USE_INET6
|
|
pfil_remove_hook(V_ipf_inet6_hook);
|
|
#endif
|
|
|
|
return (0);
|
|
}
|
|
|
|
int ipf_pfil_hook(void) {
|
|
int error, error6;
|
|
|
|
struct pfil_hook_args pha = {
|
|
.pa_version = PFIL_VERSION,
|
|
.pa_flags = PFIL_IN | PFIL_OUT,
|
|
.pa_modname = "ipfilter",
|
|
.pa_rulname = "default-ip4",
|
|
.pa_mbuf_chk = ipf_check_wrapper,
|
|
.pa_type = PFIL_TYPE_IP4,
|
|
};
|
|
V_ipf_inet_hook = pfil_add_hook(&pha);
|
|
|
|
#ifdef USE_INET6
|
|
pha.pa_rulname = "default-ip6";
|
|
pha.pa_mbuf_chk = ipf_check_wrapper6;
|
|
pha.pa_type = PFIL_TYPE_IP6;
|
|
V_ipf_inet6_hook = pfil_add_hook(&pha);
|
|
#endif
|
|
|
|
struct pfil_link_args pla = {
|
|
.pa_version = PFIL_VERSION,
|
|
.pa_flags = PFIL_IN | PFIL_OUT | PFIL_HEADPTR | PFIL_HOOKPTR,
|
|
.pa_head = V_inet_pfil_head,
|
|
.pa_hook = V_ipf_inet_hook,
|
|
};
|
|
error = pfil_link(&pla);
|
|
|
|
error6 = 0;
|
|
#ifdef USE_INET6
|
|
pla.pa_head = V_inet6_pfil_head;
|
|
pla.pa_hook = V_ipf_inet6_hook;
|
|
error6 = pfil_link(&pla);
|
|
#endif
|
|
|
|
if (error || error6)
|
|
error = ENODEV;
|
|
else
|
|
error = 0;
|
|
|
|
return (error);
|
|
}
|
|
|
|
void
|
|
ipf_event_reg(void)
|
|
{
|
|
V_ipf_arrivetag = EVENTHANDLER_REGISTER(ifnet_arrival_event, \
|
|
ipf_ifevent, NULL, \
|
|
EVENTHANDLER_PRI_ANY);
|
|
V_ipf_departtag = EVENTHANDLER_REGISTER(ifnet_departure_event, \
|
|
ipf_ifevent, NULL, \
|
|
EVENTHANDLER_PRI_ANY);
|
|
#if 0
|
|
V_ipf_clonetag = EVENTHANDLER_REGISTER(if_clone_event, ipf_ifevent, \
|
|
NULL, EVENTHANDLER_PRI_ANY);
|
|
#endif
|
|
}
|
|
|
|
void
|
|
ipf_event_dereg(void)
|
|
{
|
|
if (V_ipf_arrivetag != NULL) {
|
|
EVENTHANDLER_DEREGISTER(ifnet_arrival_event, V_ipf_arrivetag);
|
|
}
|
|
if (V_ipf_departtag != NULL) {
|
|
EVENTHANDLER_DEREGISTER(ifnet_departure_event, V_ipf_departtag);
|
|
}
|
|
#if 0
|
|
if (V_ipf_clonetag != NULL) {
|
|
EVENTHANDLER_DEREGISTER(if_clone_event, V_ipf_clonetag);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
|
|
u_32_t
|
|
ipf_random(void)
|
|
{
|
|
return (arc4random());
|
|
}
|
|
|
|
|
|
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);
|
|
}
|
|
|
|
#ifdef USE_INET6
|
|
u_int
|
|
ipf_pcksum6(struct mbuf *m, ip6_t *ip6, u_int32_t off, u_int32_t len)
|
|
{
|
|
#ifdef _KERNEL
|
|
int sum;
|
|
|
|
if (m->m_len < sizeof(struct ip6_hdr)) {
|
|
return (0xffff);
|
|
}
|
|
|
|
sum = in6_cksum(m, ip6->ip6_nxt, off, len);
|
|
return (sum);
|
|
#else
|
|
u_short *sp;
|
|
u_int sum;
|
|
|
|
sp = (u_short *)&ip6->ip6_src;
|
|
sum = *sp++; /* ip6_src */
|
|
sum += *sp++;
|
|
sum += *sp++;
|
|
sum += *sp++;
|
|
sum += *sp++;
|
|
sum += *sp++;
|
|
sum += *sp++;
|
|
sum += *sp++;
|
|
sum += *sp++; /* ip6_dst */
|
|
sum += *sp++;
|
|
sum += *sp++;
|
|
sum += *sp++;
|
|
sum += *sp++;
|
|
sum += *sp++;
|
|
sum += *sp++;
|
|
sum += *sp++;
|
|
return (ipf_pcksum(fin, off, sum));
|
|
#endif
|
|
}
|
|
#endif
|
|
|
|
void
|
|
ipf_fbsd_kenv_get(ipf_main_softc_t *softc)
|
|
{
|
|
TUNABLE_INT_FETCH("net.inet.ipf.large_nat",
|
|
&softc->ipf_large_nat);
|
|
}
|