1367 lines
43 KiB
C
1367 lines
43 KiB
C
/* $FreeBSD$ */
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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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#include <sys/errno.h>
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/file.h>
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#ifdef __hpux
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# include <sys/timeout.h>
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#endif
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#if !defined(_KERNEL)
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# include <stdio.h>
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# include <string.h>
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# include <stdlib.h>
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# define _KERNEL
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# ifdef __OpenBSD__
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struct file;
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# endif
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# include <sys/uio.h>
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# undef _KERNEL
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#endif
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#if defined(_KERNEL) && \
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defined(__FreeBSD_version) && (__FreeBSD_version >= 220000)
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# include <sys/filio.h>
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# include <sys/fcntl.h>
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#else
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# include <sys/ioctl.h>
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#endif
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#if !defined(linux)
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# include <sys/protosw.h>
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#endif
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#include <sys/socket.h>
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#if defined(_KERNEL)
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# include <sys/systm.h>
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# if !defined(__SVR4) && !defined(__svr4__)
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# include <sys/mbuf.h>
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# endif
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#endif
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#if !defined(__SVR4) && !defined(__svr4__)
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# if defined(_KERNEL) && !defined(__sgi) && !defined(AIX)
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# include <sys/kernel.h>
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# endif
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#else
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# include <sys/byteorder.h>
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# ifdef _KERNEL
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# include <sys/dditypes.h>
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# endif
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# include <sys/stream.h>
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# include <sys/kmem.h>
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#endif
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#include <net/if.h>
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#ifdef sun
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# include <net/af.h>
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#endif
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#if !defined(linux)
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# include <netinet/ip_var.h>
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#endif
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#include <netinet/tcp.h>
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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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#include <netinet/tcpip.h>
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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_auth.h"
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#include "netinet/ip_lookup.h"
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#include "netinet/ip_proxy.h"
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#include "netinet/ip_sync.h"
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/* END OF INCLUDES */
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#if !defined(lint)
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static const char sccsid[] = "@(#)ip_frag.c 1.11 3/24/96 (C) 1993-2000 Darren Reed";
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static const char rcsid[] = "@(#)$FreeBSD$";
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/* static const char rcsid[] = "@(#)$Id: ip_frag.c,v 2.77.2.12 2007/09/20 12:51:51 darrenr Exp $"; */
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#endif
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#ifdef USE_MUTEXES
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static ipfr_t *ipfr_frag_new __P((ipf_main_softc_t *, ipf_frag_softc_t *,
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fr_info_t *, u_32_t, ipfr_t **,
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ipfrwlock_t *));
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static ipfr_t *ipf_frag_lookup __P((ipf_main_softc_t *, ipf_frag_softc_t *, fr_info_t *, ipfr_t **, ipfrwlock_t *));
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static void ipf_frag_deref __P((void *, ipfr_t **, ipfrwlock_t *));
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static int ipf_frag_next __P((ipf_main_softc_t *, ipftoken_t *, ipfgeniter_t *,
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ipfr_t **, ipfrwlock_t *));
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#else
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static ipfr_t *ipfr_frag_new __P((ipf_main_softc_t *, ipf_frag_softc_t *,
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fr_info_t *, u_32_t, ipfr_t **));
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static ipfr_t *ipf_frag_lookup __P((ipf_main_softc_t *, ipf_frag_softc_t *, fr_info_t *, ipfr_t **));
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static void ipf_frag_deref __P((void *, ipfr_t **));
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static int ipf_frag_next __P((ipf_main_softc_t *, ipftoken_t *, ipfgeniter_t *,
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ipfr_t **));
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#endif
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static void ipf_frag_delete __P((ipf_main_softc_t *, ipfr_t *, ipfr_t ***));
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static void ipf_frag_free __P((ipf_frag_softc_t *, ipfr_t *));
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static frentry_t ipfr_block;
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static ipftuneable_t ipf_frag_tuneables[] = {
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{ { (void *)offsetof(ipf_frag_softc_t, ipfr_size) },
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"frag_size", 1, 0x7fffffff,
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stsizeof(ipf_frag_softc_t, ipfr_size),
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IPFT_WRDISABLED, NULL, NULL },
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{ { (void *)offsetof(ipf_frag_softc_t, ipfr_ttl) },
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"frag_ttl", 1, 0x7fffffff,
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stsizeof(ipf_frag_softc_t, ipfr_ttl),
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0, NULL, NULL },
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{ { NULL },
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NULL, 0, 0,
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0,
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0, NULL, NULL }
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};
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#define FBUMP(x) softf->ipfr_stats.x++
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#define FBUMPD(x) do { softf->ipfr_stats.x++; DT(x); } while (0)
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/* ------------------------------------------------------------------------ */
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/* Function: ipf_frag_main_load */
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/* Returns: int - 0 == success, -1 == error */
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/* Parameters: Nil */
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/* */
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/* Initialise the filter rule associted with blocked packets - everyone can */
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/* use it. */
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/* ------------------------------------------------------------------------ */
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int
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ipf_frag_main_load()
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{
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bzero((char *)&ipfr_block, sizeof(ipfr_block));
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ipfr_block.fr_flags = FR_BLOCK|FR_QUICK;
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ipfr_block.fr_ref = 1;
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return 0;
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}
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/* ------------------------------------------------------------------------ */
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/* Function: ipf_frag_main_unload */
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/* Returns: int - 0 == success, -1 == error */
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/* Parameters: Nil */
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/* */
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/* A null-op function that exists as a placeholder so that the flow in */
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/* other functions is obvious. */
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/* ------------------------------------------------------------------------ */
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int
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ipf_frag_main_unload()
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{
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return 0;
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}
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/* ------------------------------------------------------------------------ */
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/* Function: ipf_frag_soft_create */
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/* Returns: void * - NULL = failure, else pointer to local context */
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/* Parameters: softc(I) - pointer to soft context main structure */
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/* */
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/* Allocate a new soft context structure to track fragment related info. */
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/* ------------------------------------------------------------------------ */
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/*ARGSUSED*/
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void *
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ipf_frag_soft_create(softc)
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ipf_main_softc_t *softc;
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{
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ipf_frag_softc_t *softf;
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KMALLOC(softf, ipf_frag_softc_t *);
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if (softf == NULL)
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return NULL;
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bzero((char *)softf, sizeof(*softf));
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RWLOCK_INIT(&softf->ipfr_ipidfrag, "frag ipid lock");
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RWLOCK_INIT(&softf->ipfr_frag, "ipf fragment rwlock");
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RWLOCK_INIT(&softf->ipfr_natfrag, "ipf NAT fragment rwlock");
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softf->ipf_frag_tune = ipf_tune_array_copy(softf,
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sizeof(ipf_frag_tuneables),
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ipf_frag_tuneables);
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if (softf->ipf_frag_tune == NULL) {
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ipf_frag_soft_destroy(softc, softf);
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return NULL;
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}
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if (ipf_tune_array_link(softc, softf->ipf_frag_tune) == -1) {
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ipf_frag_soft_destroy(softc, softf);
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return NULL;
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}
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softf->ipfr_size = IPFT_SIZE;
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softf->ipfr_ttl = IPF_TTLVAL(60);
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softf->ipfr_lock = 1;
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softf->ipfr_tail = &softf->ipfr_list;
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softf->ipfr_nattail = &softf->ipfr_natlist;
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softf->ipfr_ipidtail = &softf->ipfr_ipidlist;
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return softf;
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}
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/* ------------------------------------------------------------------------ */
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/* Function: ipf_frag_soft_destroy */
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/* Returns: Nil */
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/* Parameters: softc(I) - pointer to soft context main structure */
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/* arg(I) - pointer to local context to use */
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/* */
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/* Initialise the hash tables for the fragment cache lookups. */
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/* ------------------------------------------------------------------------ */
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void
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ipf_frag_soft_destroy(softc, arg)
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ipf_main_softc_t *softc;
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void *arg;
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{
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ipf_frag_softc_t *softf = arg;
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RW_DESTROY(&softf->ipfr_ipidfrag);
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RW_DESTROY(&softf->ipfr_frag);
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RW_DESTROY(&softf->ipfr_natfrag);
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if (softf->ipf_frag_tune != NULL) {
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ipf_tune_array_unlink(softc, softf->ipf_frag_tune);
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KFREES(softf->ipf_frag_tune, sizeof(ipf_frag_tuneables));
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softf->ipf_frag_tune = NULL;
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}
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KFREE(softf);
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}
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/* ------------------------------------------------------------------------ */
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/* Function: ipf_frag_soft_init */
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/* Returns: int - 0 == success, -1 == error */
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/* Parameters: softc(I) - pointer to soft context main structure */
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/* arg(I) - pointer to local context to use */
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/* */
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/* Initialise the hash tables for the fragment cache lookups. */
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/* ------------------------------------------------------------------------ */
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/*ARGSUSED*/
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int
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ipf_frag_soft_init(softc, arg)
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ipf_main_softc_t *softc;
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void *arg;
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{
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ipf_frag_softc_t *softf = arg;
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KMALLOCS(softf->ipfr_heads, ipfr_t **,
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softf->ipfr_size * sizeof(ipfr_t *));
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if (softf->ipfr_heads == NULL)
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return -1;
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bzero((char *)softf->ipfr_heads, softf->ipfr_size * sizeof(ipfr_t *));
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KMALLOCS(softf->ipfr_nattab, ipfr_t **,
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softf->ipfr_size * sizeof(ipfr_t *));
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if (softf->ipfr_nattab == NULL)
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return -2;
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bzero((char *)softf->ipfr_nattab, softf->ipfr_size * sizeof(ipfr_t *));
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KMALLOCS(softf->ipfr_ipidtab, ipfr_t **,
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softf->ipfr_size * sizeof(ipfr_t *));
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if (softf->ipfr_ipidtab == NULL)
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return -3;
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bzero((char *)softf->ipfr_ipidtab,
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softf->ipfr_size * sizeof(ipfr_t *));
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softf->ipfr_lock = 0;
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softf->ipfr_inited = 1;
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return 0;
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}
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/* ------------------------------------------------------------------------ */
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/* Function: ipf_frag_soft_fini */
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/* Returns: int - 0 == success, -1 == error */
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/* Parameters: softc(I) - pointer to soft context main structure */
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/* arg(I) - pointer to local context to use */
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/* */
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/* Free all memory allocated whilst running and from initialisation. */
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/* ------------------------------------------------------------------------ */
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int
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ipf_frag_soft_fini(softc, arg)
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ipf_main_softc_t *softc;
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void *arg;
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{
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ipf_frag_softc_t *softf = arg;
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softf->ipfr_lock = 1;
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if (softf->ipfr_inited == 1) {
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ipf_frag_clear(softc);
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softf->ipfr_inited = 0;
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}
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if (softf->ipfr_heads != NULL)
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KFREES(softf->ipfr_heads,
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softf->ipfr_size * sizeof(ipfr_t *));
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softf->ipfr_heads = NULL;
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if (softf->ipfr_nattab != NULL)
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KFREES(softf->ipfr_nattab,
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softf->ipfr_size * sizeof(ipfr_t *));
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softf->ipfr_nattab = NULL;
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if (softf->ipfr_ipidtab != NULL)
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KFREES(softf->ipfr_ipidtab,
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softf->ipfr_size * sizeof(ipfr_t *));
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softf->ipfr_ipidtab = NULL;
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return 0;
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}
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/* ------------------------------------------------------------------------ */
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/* Function: ipf_frag_set_lock */
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/* Returns: Nil */
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/* Parameters: arg(I) - pointer to local context to use */
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/* tmp(I) - new value for lock */
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/* */
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/* Stub function that allows for external manipulation of ipfr_lock */
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/* ------------------------------------------------------------------------ */
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void
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ipf_frag_setlock(arg, tmp)
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void *arg;
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int tmp;
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{
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ipf_frag_softc_t *softf = arg;
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softf->ipfr_lock = tmp;
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}
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/* ------------------------------------------------------------------------ */
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/* Function: ipf_frag_stats */
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/* Returns: ipfrstat_t* - pointer to struct with current frag stats */
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/* Parameters: arg(I) - pointer to local context to use */
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/* */
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/* Updates ipfr_stats with current information and returns a pointer to it */
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/* ------------------------------------------------------------------------ */
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ipfrstat_t *
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ipf_frag_stats(arg)
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void *arg;
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{
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ipf_frag_softc_t *softf = arg;
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softf->ipfr_stats.ifs_table = softf->ipfr_heads;
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softf->ipfr_stats.ifs_nattab = softf->ipfr_nattab;
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return &softf->ipfr_stats;
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}
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/* ------------------------------------------------------------------------ */
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/* Function: ipfr_frag_new */
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/* Returns: ipfr_t * - pointer to fragment cache state info or NULL */
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/* Parameters: fin(I) - pointer to packet information */
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/* table(I) - pointer to frag table to add to */
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/* lock(I) - pointer to lock to get a write hold of */
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/* */
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/* Add a new entry to the fragment cache, registering it as having come */
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/* through this box, with the result of the filter operation. */
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/* */
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/* If this function succeeds, it returns with a write lock held on "lock". */
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/* If it fails, no lock is held on return. */
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/* ------------------------------------------------------------------------ */
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static ipfr_t *
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ipfr_frag_new(softc, softf, fin, pass, table
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#ifdef USE_MUTEXES
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, lock
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#endif
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)
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ipf_main_softc_t *softc;
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ipf_frag_softc_t *softf;
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fr_info_t *fin;
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u_32_t pass;
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ipfr_t *table[];
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#ifdef USE_MUTEXES
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ipfrwlock_t *lock;
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#endif
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{
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ipfr_t *fra, frag, *fran;
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u_int idx, off;
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frentry_t *fr;
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if (softf->ipfr_stats.ifs_inuse >= softf->ipfr_size) {
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FBUMPD(ifs_maximum);
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return NULL;
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}
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if ((fin->fin_flx & (FI_FRAG|FI_BAD)) != FI_FRAG) {
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FBUMPD(ifs_newbad);
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return NULL;
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}
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if (pass & FR_FRSTRICT) {
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if (fin->fin_off != 0) {
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FBUMPD(ifs_newrestrictnot0);
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return NULL;
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}
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}
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frag.ipfr_v = fin->fin_v;
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idx = fin->fin_v;
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frag.ipfr_p = fin->fin_p;
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idx += fin->fin_p;
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frag.ipfr_id = fin->fin_id;
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idx += fin->fin_id;
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frag.ipfr_source = fin->fin_fi.fi_src;
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idx += frag.ipfr_src.s_addr;
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frag.ipfr_dest = fin->fin_fi.fi_dst;
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idx += frag.ipfr_dst.s_addr;
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frag.ipfr_ifp = fin->fin_ifp;
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idx *= 127;
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idx %= softf->ipfr_size;
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frag.ipfr_optmsk = fin->fin_fi.fi_optmsk & IPF_OPTCOPY;
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frag.ipfr_secmsk = fin->fin_fi.fi_secmsk;
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frag.ipfr_auth = fin->fin_fi.fi_auth;
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off = fin->fin_off >> 3;
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if (off == 0) {
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char *ptr;
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int end;
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#ifdef USE_INET6
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if (fin->fin_v == 6) {
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ptr = (char *)fin->fin_fraghdr +
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sizeof(struct ip6_frag);
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} else
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#endif
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{
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ptr = fin->fin_dp;
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}
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end = fin->fin_plen - (ptr - (char *)fin->fin_ip);
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frag.ipfr_firstend = end >> 3;
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} else {
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frag.ipfr_firstend = 0;
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}
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/*
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* allocate some memory, if possible, if not, just record that we
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* failed to do so.
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*/
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KMALLOC(fran, ipfr_t *);
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if (fran == NULL) {
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FBUMPD(ifs_nomem);
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return NULL;
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}
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WRITE_ENTER(lock);
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/*
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* first, make sure it isn't already there...
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*/
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for (fra = table[idx]; (fra != NULL); fra = fra->ipfr_hnext)
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if (!bcmp((char *)&frag.ipfr_ifp, (char *)&fra->ipfr_ifp,
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IPFR_CMPSZ)) {
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RWLOCK_EXIT(lock);
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FBUMPD(ifs_exists);
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KFREE(fran);
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return NULL;
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}
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fra = fran;
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fran = NULL;
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fr = fin->fin_fr;
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fra->ipfr_rule = fr;
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if (fr != NULL) {
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MUTEX_ENTER(&fr->fr_lock);
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fr->fr_ref++;
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MUTEX_EXIT(&fr->fr_lock);
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}
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/*
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* Insert the fragment into the fragment table, copy the struct used
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* in the search using bcopy rather than reassign each field.
|
|
* Set the ttl to the default.
|
|
*/
|
|
if ((fra->ipfr_hnext = table[idx]) != NULL)
|
|
table[idx]->ipfr_hprev = &fra->ipfr_hnext;
|
|
fra->ipfr_hprev = table + idx;
|
|
fra->ipfr_data = NULL;
|
|
table[idx] = fra;
|
|
bcopy((char *)&frag.ipfr_ifp, (char *)&fra->ipfr_ifp, IPFR_CMPSZ);
|
|
fra->ipfr_v = fin->fin_v;
|
|
fra->ipfr_ttl = softc->ipf_ticks + softf->ipfr_ttl;
|
|
fra->ipfr_firstend = frag.ipfr_firstend;
|
|
|
|
/*
|
|
* Compute the offset of the expected start of the next packet.
|
|
*/
|
|
if (off == 0)
|
|
fra->ipfr_seen0 = 1;
|
|
fra->ipfr_off = off + (fin->fin_dlen >> 3);
|
|
fra->ipfr_pass = pass;
|
|
fra->ipfr_ref = 1;
|
|
fra->ipfr_pkts = 1;
|
|
fra->ipfr_bytes = fin->fin_plen;
|
|
FBUMP(ifs_inuse);
|
|
FBUMP(ifs_new);
|
|
return fra;
|
|
}
|
|
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
/* Function: ipf_frag_new */
|
|
/* Returns: int - 0 == success, -1 == error */
|
|
/* Parameters: fin(I) - pointer to packet information */
|
|
/* */
|
|
/* Add a new entry to the fragment cache table based on the current packet */
|
|
/* ------------------------------------------------------------------------ */
|
|
int
|
|
ipf_frag_new(softc, fin, pass)
|
|
ipf_main_softc_t *softc;
|
|
u_32_t pass;
|
|
fr_info_t *fin;
|
|
{
|
|
ipf_frag_softc_t *softf = softc->ipf_frag_soft;
|
|
ipfr_t *fra;
|
|
|
|
if (softf->ipfr_lock != 0)
|
|
return -1;
|
|
|
|
#ifdef USE_MUTEXES
|
|
fra = ipfr_frag_new(softc, softf, fin, pass, softf->ipfr_heads, &softc->ipf_frag);
|
|
#else
|
|
fra = ipfr_frag_new(softc, softf, fin, pass, softf->ipfr_heads);
|
|
#endif
|
|
if (fra != NULL) {
|
|
*softf->ipfr_tail = fra;
|
|
fra->ipfr_prev = softf->ipfr_tail;
|
|
softf->ipfr_tail = &fra->ipfr_next;
|
|
fra->ipfr_next = NULL;
|
|
RWLOCK_EXIT(&softc->ipf_frag);
|
|
}
|
|
return fra ? 0 : -1;
|
|
}
|
|
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
/* Function: ipf_frag_natnew */
|
|
/* Returns: int - 0 == success, -1 == error */
|
|
/* Parameters: fin(I) - pointer to packet information */
|
|
/* nat(I) - pointer to NAT structure */
|
|
/* */
|
|
/* Create a new NAT fragment cache entry based on the current packet and */
|
|
/* the NAT structure for this "session". */
|
|
/* ------------------------------------------------------------------------ */
|
|
int
|
|
ipf_frag_natnew(softc, fin, pass, nat)
|
|
ipf_main_softc_t *softc;
|
|
fr_info_t *fin;
|
|
u_32_t pass;
|
|
nat_t *nat;
|
|
{
|
|
ipf_frag_softc_t *softf = softc->ipf_frag_soft;
|
|
ipfr_t *fra;
|
|
|
|
if (softf->ipfr_lock != 0)
|
|
return 0;
|
|
|
|
#ifdef USE_MUTEXES
|
|
fra = ipfr_frag_new(softc, softf, fin, pass, softf->ipfr_nattab,
|
|
&softf->ipfr_natfrag);
|
|
#else
|
|
fra = ipfr_frag_new(softc, softf, fin, pass, softf->ipfr_nattab);
|
|
#endif
|
|
if (fra != NULL) {
|
|
fra->ipfr_data = nat;
|
|
nat->nat_data = fra;
|
|
*softf->ipfr_nattail = fra;
|
|
fra->ipfr_prev = softf->ipfr_nattail;
|
|
softf->ipfr_nattail = &fra->ipfr_next;
|
|
fra->ipfr_next = NULL;
|
|
RWLOCK_EXIT(&softf->ipfr_natfrag);
|
|
return 0;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
/* Function: ipf_frag_ipidnew */
|
|
/* Returns: int - 0 == success, -1 == error */
|
|
/* Parameters: fin(I) - pointer to packet information */
|
|
/* ipid(I) - new IP ID for this fragmented packet */
|
|
/* */
|
|
/* Create a new fragment cache entry for this packet and store, as a data */
|
|
/* pointer, the new IP ID value. */
|
|
/* ------------------------------------------------------------------------ */
|
|
int
|
|
ipf_frag_ipidnew(fin, ipid)
|
|
fr_info_t *fin;
|
|
u_32_t ipid;
|
|
{
|
|
ipf_main_softc_t *softc = fin->fin_main_soft;
|
|
ipf_frag_softc_t *softf = softc->ipf_frag_soft;
|
|
ipfr_t *fra;
|
|
|
|
if (softf->ipfr_lock)
|
|
return 0;
|
|
|
|
#ifdef USE_MUTEXES
|
|
fra = ipfr_frag_new(softc, softf, fin, 0, softf->ipfr_ipidtab, &softf->ipfr_ipidfrag);
|
|
#else
|
|
fra = ipfr_frag_new(softc, softf, fin, 0, softf->ipfr_ipidtab);
|
|
#endif
|
|
if (fra != NULL) {
|
|
fra->ipfr_data = (void *)(intptr_t)ipid;
|
|
*softf->ipfr_ipidtail = fra;
|
|
fra->ipfr_prev = softf->ipfr_ipidtail;
|
|
softf->ipfr_ipidtail = &fra->ipfr_next;
|
|
fra->ipfr_next = NULL;
|
|
RWLOCK_EXIT(&softf->ipfr_ipidfrag);
|
|
}
|
|
return fra ? 0 : -1;
|
|
}
|
|
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
/* Function: ipf_frag_lookup */
|
|
/* Returns: ipfr_t * - pointer to ipfr_t structure if there's a */
|
|
/* matching entry in the frag table, else NULL */
|
|
/* Parameters: fin(I) - pointer to packet information */
|
|
/* table(I) - pointer to fragment cache table to search */
|
|
/* */
|
|
/* Check the fragment cache to see if there is already a record of this */
|
|
/* packet with its filter result known. */
|
|
/* */
|
|
/* If this function succeeds, it returns with a write lock held on "lock". */
|
|
/* If it fails, no lock is held on return. */
|
|
/* ------------------------------------------------------------------------ */
|
|
static ipfr_t *
|
|
ipf_frag_lookup(softc, softf, fin, table
|
|
#ifdef USE_MUTEXES
|
|
, lock
|
|
#endif
|
|
)
|
|
ipf_main_softc_t *softc;
|
|
ipf_frag_softc_t *softf;
|
|
fr_info_t *fin;
|
|
ipfr_t *table[];
|
|
#ifdef USE_MUTEXES
|
|
ipfrwlock_t *lock;
|
|
#endif
|
|
{
|
|
ipfr_t *f, frag;
|
|
u_int idx;
|
|
|
|
/*
|
|
* We don't want to let short packets match because they could be
|
|
* compromising the security of other rules that want to match on
|
|
* layer 4 fields (and can't because they have been fragmented off.)
|
|
* Why do this check here? The counter acts as an indicator of this
|
|
* kind of attack, whereas if it was elsewhere, it wouldn't know if
|
|
* other matching packets had been seen.
|
|
*/
|
|
if (fin->fin_flx & FI_SHORT) {
|
|
FBUMPD(ifs_short);
|
|
return NULL;
|
|
}
|
|
|
|
if ((fin->fin_flx & FI_BAD) != 0) {
|
|
FBUMPD(ifs_bad);
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* For fragments, we record protocol, packet id, TOS and both IP#'s
|
|
* (these should all be the same for all fragments of a packet).
|
|
*
|
|
* build up a hash value to index the table with.
|
|
*/
|
|
frag.ipfr_v = fin->fin_v;
|
|
idx = fin->fin_v;
|
|
frag.ipfr_p = fin->fin_p;
|
|
idx += fin->fin_p;
|
|
frag.ipfr_id = fin->fin_id;
|
|
idx += fin->fin_id;
|
|
frag.ipfr_source = fin->fin_fi.fi_src;
|
|
idx += frag.ipfr_src.s_addr;
|
|
frag.ipfr_dest = fin->fin_fi.fi_dst;
|
|
idx += frag.ipfr_dst.s_addr;
|
|
frag.ipfr_ifp = fin->fin_ifp;
|
|
idx *= 127;
|
|
idx %= softf->ipfr_size;
|
|
|
|
frag.ipfr_optmsk = fin->fin_fi.fi_optmsk & IPF_OPTCOPY;
|
|
frag.ipfr_secmsk = fin->fin_fi.fi_secmsk;
|
|
frag.ipfr_auth = fin->fin_fi.fi_auth;
|
|
|
|
READ_ENTER(lock);
|
|
|
|
/*
|
|
* check the table, careful to only compare the right amount of data
|
|
*/
|
|
for (f = table[idx]; f; f = f->ipfr_hnext) {
|
|
if (!bcmp((char *)&frag.ipfr_ifp, (char *)&f->ipfr_ifp,
|
|
IPFR_CMPSZ)) {
|
|
u_short off;
|
|
|
|
/*
|
|
* XXX - We really need to be guarding against the
|
|
* retransmission of (src,dst,id,offset-range) here
|
|
* because a fragmented packet is never resent with
|
|
* the same IP ID# (or shouldn't).
|
|
*/
|
|
off = fin->fin_off >> 3;
|
|
if (f->ipfr_seen0) {
|
|
if (off == 0) {
|
|
FBUMPD(ifs_retrans0);
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* Case 3. See comment for frpr_fragment6.
|
|
*/
|
|
if ((f->ipfr_firstend != 0) &&
|
|
(off < f->ipfr_firstend)) {
|
|
FBUMP(ifs_overlap);
|
|
DT2(ifs_overlap, u_short, off,
|
|
ipfr_t *, f);
|
|
DT3(ipf_fi_bad_ifs_overlap, fr_info_t *, fin, u_short, off,
|
|
ipfr_t *, f);
|
|
fin->fin_flx |= FI_BAD;
|
|
break;
|
|
}
|
|
} else if (off == 0)
|
|
f->ipfr_seen0 = 1;
|
|
|
|
if (f != table[idx]) {
|
|
ipfr_t **fp;
|
|
|
|
/*
|
|
* Move fragment info. to the top of the list
|
|
* to speed up searches. First, delink...
|
|
*/
|
|
fp = f->ipfr_hprev;
|
|
(*fp) = f->ipfr_hnext;
|
|
if (f->ipfr_hnext != NULL)
|
|
f->ipfr_hnext->ipfr_hprev = fp;
|
|
/*
|
|
* Then put back at the top of the chain.
|
|
*/
|
|
f->ipfr_hnext = table[idx];
|
|
table[idx]->ipfr_hprev = &f->ipfr_hnext;
|
|
f->ipfr_hprev = table + idx;
|
|
table[idx] = f;
|
|
}
|
|
|
|
/*
|
|
* If we've follwed the fragments, and this is the
|
|
* last (in order), shrink expiration time.
|
|
*/
|
|
if (off == f->ipfr_off) {
|
|
f->ipfr_off = (fin->fin_dlen >> 3) + off;
|
|
|
|
/*
|
|
* Well, we could shrink the expiration time
|
|
* but only if every fragment has been seen
|
|
* in order upto this, the last. ipfr_badorder
|
|
* is used here to count those out of order
|
|
* and if it equals 0 when we get to the last
|
|
* fragment then we can assume all of the
|
|
* fragments have been seen and in order.
|
|
*/
|
|
#if 0
|
|
/*
|
|
* Doing this properly requires moving it to
|
|
* the head of the list which is infesible.
|
|
*/
|
|
if ((more == 0) && (f->ipfr_badorder == 0))
|
|
f->ipfr_ttl = softc->ipf_ticks + 1;
|
|
#endif
|
|
} else {
|
|
f->ipfr_badorder++;
|
|
FBUMPD(ifs_unordered);
|
|
if (f->ipfr_pass & FR_FRSTRICT) {
|
|
FBUMPD(ifs_strict);
|
|
continue;
|
|
}
|
|
}
|
|
f->ipfr_pkts++;
|
|
f->ipfr_bytes += fin->fin_plen;
|
|
FBUMP(ifs_hits);
|
|
return f;
|
|
}
|
|
}
|
|
|
|
RWLOCK_EXIT(lock);
|
|
FBUMP(ifs_miss);
|
|
return NULL;
|
|
}
|
|
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
/* Function: ipf_frag_natknown */
|
|
/* Returns: nat_t* - pointer to 'parent' NAT structure if frag table */
|
|
/* match found, else NULL */
|
|
/* Parameters: fin(I) - pointer to packet information */
|
|
/* */
|
|
/* Functional interface for NAT lookups of the NAT fragment cache */
|
|
/* ------------------------------------------------------------------------ */
|
|
nat_t *
|
|
ipf_frag_natknown(fin)
|
|
fr_info_t *fin;
|
|
{
|
|
ipf_main_softc_t *softc = fin->fin_main_soft;
|
|
ipf_frag_softc_t *softf = softc->ipf_frag_soft;
|
|
nat_t *nat;
|
|
ipfr_t *ipf;
|
|
|
|
if ((softf->ipfr_lock) || !softf->ipfr_natlist)
|
|
return NULL;
|
|
#ifdef USE_MUTEXES
|
|
ipf = ipf_frag_lookup(softc, softf, fin, softf->ipfr_nattab,
|
|
&softf->ipfr_natfrag);
|
|
#else
|
|
ipf = ipf_frag_lookup(softc, softf, fin, softf->ipfr_nattab);
|
|
#endif
|
|
if (ipf != NULL) {
|
|
nat = ipf->ipfr_data;
|
|
/*
|
|
* This is the last fragment for this packet.
|
|
*/
|
|
if ((ipf->ipfr_ttl == softc->ipf_ticks + 1) && (nat != NULL)) {
|
|
nat->nat_data = NULL;
|
|
ipf->ipfr_data = NULL;
|
|
}
|
|
RWLOCK_EXIT(&softf->ipfr_natfrag);
|
|
} else
|
|
nat = NULL;
|
|
return nat;
|
|
}
|
|
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
/* Function: ipf_frag_ipidknown */
|
|
/* Returns: u_32_t - IPv4 ID for this packet if match found, else */
|
|
/* return 0xfffffff to indicate no match. */
|
|
/* Parameters: fin(I) - pointer to packet information */
|
|
/* */
|
|
/* Functional interface for IP ID lookups of the IP ID fragment cache */
|
|
/* ------------------------------------------------------------------------ */
|
|
u_32_t
|
|
ipf_frag_ipidknown(fin)
|
|
fr_info_t *fin;
|
|
{
|
|
ipf_main_softc_t *softc = fin->fin_main_soft;
|
|
ipf_frag_softc_t *softf = softc->ipf_frag_soft;
|
|
ipfr_t *ipf;
|
|
u_32_t id;
|
|
|
|
if (softf->ipfr_lock || !softf->ipfr_ipidlist)
|
|
return 0xffffffff;
|
|
|
|
#ifdef USE_MUTEXES
|
|
ipf = ipf_frag_lookup(softc, softf, fin, softf->ipfr_ipidtab,
|
|
&softf->ipfr_ipidfrag);
|
|
#else
|
|
ipf = ipf_frag_lookup(softc, softf, fin, softf->ipfr_ipidtab);
|
|
#endif
|
|
if (ipf != NULL) {
|
|
id = (u_32_t)(intptr_t)ipf->ipfr_data;
|
|
RWLOCK_EXIT(&softf->ipfr_ipidfrag);
|
|
} else
|
|
id = 0xffffffff;
|
|
return id;
|
|
}
|
|
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
/* Function: ipf_frag_known */
|
|
/* Returns: frentry_t* - pointer to filter rule if a match is found in */
|
|
/* the frag cache table, else NULL. */
|
|
/* Parameters: fin(I) - pointer to packet information */
|
|
/* passp(O) - pointer to where to store rule flags resturned */
|
|
/* */
|
|
/* Functional interface for normal lookups of the fragment cache. If a */
|
|
/* match is found, return the rule pointer and flags from the rule, except */
|
|
/* that if FR_LOGFIRST is set, reset FR_LOG. */
|
|
/* ------------------------------------------------------------------------ */
|
|
frentry_t *
|
|
ipf_frag_known(fin, passp)
|
|
fr_info_t *fin;
|
|
u_32_t *passp;
|
|
{
|
|
ipf_main_softc_t *softc = fin->fin_main_soft;
|
|
ipf_frag_softc_t *softf = softc->ipf_frag_soft;
|
|
frentry_t *fr = NULL;
|
|
ipfr_t *fra;
|
|
u_32_t pass;
|
|
|
|
if ((softf->ipfr_lock) || (softf->ipfr_list == NULL))
|
|
return NULL;
|
|
|
|
#ifdef USE_MUTEXES
|
|
fra = ipf_frag_lookup(softc, softf, fin, softf->ipfr_heads,
|
|
&softc->ipf_frag);
|
|
#else
|
|
fra = ipf_frag_lookup(softc, softf, fin, softf->ipfr_heads);
|
|
#endif
|
|
if (fra != NULL) {
|
|
if (fin->fin_flx & FI_BAD) {
|
|
fr = &ipfr_block;
|
|
fin->fin_reason = FRB_BADFRAG;
|
|
DT2(ipf_frb_badfrag, fr_info_t *, fin, uint, fra);
|
|
} else {
|
|
fr = fra->ipfr_rule;
|
|
}
|
|
fin->fin_fr = fr;
|
|
if (fr != NULL) {
|
|
pass = fr->fr_flags;
|
|
if ((pass & FR_KEEPSTATE) != 0) {
|
|
fin->fin_flx |= FI_STATE;
|
|
/*
|
|
* Reset the keep state flag here so that we
|
|
* don't try and add a new state entry because
|
|
* of a match here. That leads to blocking of
|
|
* the packet later because the add fails.
|
|
*/
|
|
pass &= ~FR_KEEPSTATE;
|
|
}
|
|
if ((pass & FR_LOGFIRST) != 0)
|
|
pass &= ~(FR_LOGFIRST|FR_LOG);
|
|
*passp = pass;
|
|
}
|
|
RWLOCK_EXIT(&softc->ipf_frag);
|
|
}
|
|
return fr;
|
|
}
|
|
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
/* Function: ipf_frag_natforget */
|
|
/* Returns: Nil */
|
|
/* Parameters: softc(I) - pointer to soft context main structure */
|
|
/* ptr(I) - pointer to data structure */
|
|
/* */
|
|
/* Search through all of the fragment cache entries for NAT and wherever a */
|
|
/* pointer is found to match ptr, reset it to NULL. */
|
|
/* ------------------------------------------------------------------------ */
|
|
void
|
|
ipf_frag_natforget(softc, ptr)
|
|
ipf_main_softc_t *softc;
|
|
void *ptr;
|
|
{
|
|
ipf_frag_softc_t *softf = softc->ipf_frag_soft;
|
|
ipfr_t *fr;
|
|
|
|
WRITE_ENTER(&softf->ipfr_natfrag);
|
|
for (fr = softf->ipfr_natlist; fr; fr = fr->ipfr_next)
|
|
if (fr->ipfr_data == ptr)
|
|
fr->ipfr_data = NULL;
|
|
RWLOCK_EXIT(&softf->ipfr_natfrag);
|
|
}
|
|
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
/* Function: ipf_frag_delete */
|
|
/* Returns: Nil */
|
|
/* Parameters: softc(I) - pointer to soft context main structure */
|
|
/* fra(I) - pointer to fragment structure to delete */
|
|
/* tail(IO) - pointer to the pointer to the tail of the frag */
|
|
/* list */
|
|
/* */
|
|
/* Remove a fragment cache table entry from the table & list. Also free */
|
|
/* the filter rule it is associated with it if it is no longer used as a */
|
|
/* result of decreasing the reference count. */
|
|
/* ------------------------------------------------------------------------ */
|
|
static void
|
|
ipf_frag_delete(softc, fra, tail)
|
|
ipf_main_softc_t *softc;
|
|
ipfr_t *fra, ***tail;
|
|
{
|
|
ipf_frag_softc_t *softf = softc->ipf_frag_soft;
|
|
|
|
if (fra->ipfr_next)
|
|
fra->ipfr_next->ipfr_prev = fra->ipfr_prev;
|
|
*fra->ipfr_prev = fra->ipfr_next;
|
|
if (*tail == &fra->ipfr_next)
|
|
*tail = fra->ipfr_prev;
|
|
|
|
if (fra->ipfr_hnext)
|
|
fra->ipfr_hnext->ipfr_hprev = fra->ipfr_hprev;
|
|
*fra->ipfr_hprev = fra->ipfr_hnext;
|
|
|
|
if (fra->ipfr_rule != NULL) {
|
|
(void) ipf_derefrule(softc, &fra->ipfr_rule);
|
|
}
|
|
|
|
if (fra->ipfr_ref <= 0)
|
|
ipf_frag_free(softf, fra);
|
|
}
|
|
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
/* Function: ipf_frag_free */
|
|
/* Returns: Nil */
|
|
/* Parameters: softf(I) - pointer to fragment context information */
|
|
/* fra(I) - pointer to fragment structure to free */
|
|
/* */
|
|
/* Free up a fragment cache entry and bump relevent statistics. */
|
|
/* ------------------------------------------------------------------------ */
|
|
static void
|
|
ipf_frag_free(softf, fra)
|
|
ipf_frag_softc_t *softf;
|
|
ipfr_t *fra;
|
|
{
|
|
KFREE(fra);
|
|
FBUMP(ifs_expire);
|
|
softf->ipfr_stats.ifs_inuse--;
|
|
}
|
|
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
/* Function: ipf_frag_clear */
|
|
/* Returns: Nil */
|
|
/* Parameters: softc(I) - pointer to soft context main structure */
|
|
/* */
|
|
/* Free memory in use by fragment state information kept. Do the normal */
|
|
/* fragment state stuff first and then the NAT-fragment table. */
|
|
/* ------------------------------------------------------------------------ */
|
|
void
|
|
ipf_frag_clear(softc)
|
|
ipf_main_softc_t *softc;
|
|
{
|
|
ipf_frag_softc_t *softf = softc->ipf_frag_soft;
|
|
ipfr_t *fra;
|
|
nat_t *nat;
|
|
|
|
WRITE_ENTER(&softc->ipf_frag);
|
|
while ((fra = softf->ipfr_list) != NULL) {
|
|
fra->ipfr_ref--;
|
|
ipf_frag_delete(softc, fra, &softf->ipfr_tail);
|
|
}
|
|
softf->ipfr_tail = &softf->ipfr_list;
|
|
RWLOCK_EXIT(&softc->ipf_frag);
|
|
|
|
WRITE_ENTER(&softc->ipf_nat);
|
|
WRITE_ENTER(&softf->ipfr_natfrag);
|
|
while ((fra = softf->ipfr_natlist) != NULL) {
|
|
nat = fra->ipfr_data;
|
|
if (nat != NULL) {
|
|
if (nat->nat_data == fra)
|
|
nat->nat_data = NULL;
|
|
}
|
|
fra->ipfr_ref--;
|
|
ipf_frag_delete(softc, fra, &softf->ipfr_nattail);
|
|
}
|
|
softf->ipfr_nattail = &softf->ipfr_natlist;
|
|
RWLOCK_EXIT(&softf->ipfr_natfrag);
|
|
RWLOCK_EXIT(&softc->ipf_nat);
|
|
}
|
|
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
/* Function: ipf_frag_expire */
|
|
/* Returns: Nil */
|
|
/* Parameters: softc(I) - pointer to soft context main structure */
|
|
/* */
|
|
/* Expire entries in the fragment cache table that have been there too long */
|
|
/* ------------------------------------------------------------------------ */
|
|
void
|
|
ipf_frag_expire(softc)
|
|
ipf_main_softc_t *softc;
|
|
{
|
|
ipf_frag_softc_t *softf = softc->ipf_frag_soft;
|
|
ipfr_t **fp, *fra;
|
|
nat_t *nat;
|
|
SPL_INT(s);
|
|
|
|
if (softf->ipfr_lock)
|
|
return;
|
|
|
|
SPL_NET(s);
|
|
WRITE_ENTER(&softc->ipf_frag);
|
|
/*
|
|
* Go through the entire table, looking for entries to expire,
|
|
* which is indicated by the ttl being less than or equal to ipf_ticks.
|
|
*/
|
|
for (fp = &softf->ipfr_list; ((fra = *fp) != NULL); ) {
|
|
if (fra->ipfr_ttl > softc->ipf_ticks)
|
|
break;
|
|
fra->ipfr_ref--;
|
|
ipf_frag_delete(softc, fra, &softf->ipfr_tail);
|
|
}
|
|
RWLOCK_EXIT(&softc->ipf_frag);
|
|
|
|
WRITE_ENTER(&softf->ipfr_ipidfrag);
|
|
for (fp = &softf->ipfr_ipidlist; ((fra = *fp) != NULL); ) {
|
|
if (fra->ipfr_ttl > softc->ipf_ticks)
|
|
break;
|
|
fra->ipfr_ref--;
|
|
ipf_frag_delete(softc, fra, &softf->ipfr_ipidtail);
|
|
}
|
|
RWLOCK_EXIT(&softf->ipfr_ipidfrag);
|
|
|
|
/*
|
|
* Same again for the NAT table, except that if the structure also
|
|
* still points to a NAT structure, and the NAT structure points back
|
|
* at the one to be free'd, NULL the reference from the NAT struct.
|
|
* NOTE: We need to grab both mutex's early, and in this order so as
|
|
* to prevent a deadlock if both try to expire at the same time.
|
|
* The extra if() statement here is because it locks out all NAT
|
|
* operations - no need to do that if there are no entries in this
|
|
* list, right?
|
|
*/
|
|
if (softf->ipfr_natlist != NULL) {
|
|
WRITE_ENTER(&softc->ipf_nat);
|
|
WRITE_ENTER(&softf->ipfr_natfrag);
|
|
for (fp = &softf->ipfr_natlist; ((fra = *fp) != NULL); ) {
|
|
if (fra->ipfr_ttl > softc->ipf_ticks)
|
|
break;
|
|
nat = fra->ipfr_data;
|
|
if (nat != NULL) {
|
|
if (nat->nat_data == fra)
|
|
nat->nat_data = NULL;
|
|
}
|
|
fra->ipfr_ref--;
|
|
ipf_frag_delete(softc, fra, &softf->ipfr_nattail);
|
|
}
|
|
RWLOCK_EXIT(&softf->ipfr_natfrag);
|
|
RWLOCK_EXIT(&softc->ipf_nat);
|
|
}
|
|
SPL_X(s);
|
|
}
|
|
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
/* Function: ipf_frag_pkt_next */
|
|
/* Returns: int - 0 == success, else error */
|
|
/* Parameters: softc(I) - pointer to soft context main structure */
|
|
/* token(I) - pointer to token information for this caller */
|
|
/* itp(I) - pointer to generic iterator from caller */
|
|
/* */
|
|
/* This function is used to step through the fragment cache list used for */
|
|
/* filter rules. The hard work is done by the more generic ipf_frag_next. */
|
|
/* ------------------------------------------------------------------------ */
|
|
int
|
|
ipf_frag_pkt_next(softc, token, itp)
|
|
ipf_main_softc_t *softc;
|
|
ipftoken_t *token;
|
|
ipfgeniter_t *itp;
|
|
{
|
|
ipf_frag_softc_t *softf = softc->ipf_frag_soft;
|
|
|
|
#ifdef USE_MUTEXES
|
|
return ipf_frag_next(softc, token, itp, &softf->ipfr_list,
|
|
&softf->ipfr_frag);
|
|
#else
|
|
return ipf_frag_next(softc, token, itp, &softf->ipfr_list);
|
|
#endif
|
|
}
|
|
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
/* Function: ipf_frag_nat_next */
|
|
/* Returns: int - 0 == success, else error */
|
|
/* Parameters: softc(I) - pointer to soft context main structure */
|
|
/* token(I) - pointer to token information for this caller */
|
|
/* itp(I) - pointer to generic iterator from caller */
|
|
/* */
|
|
/* This function is used to step through the fragment cache list used for */
|
|
/* NAT. The hard work is done by the more generic ipf_frag_next. */
|
|
/* ------------------------------------------------------------------------ */
|
|
int
|
|
ipf_frag_nat_next(softc, token, itp)
|
|
ipf_main_softc_t *softc;
|
|
ipftoken_t *token;
|
|
ipfgeniter_t *itp;
|
|
{
|
|
ipf_frag_softc_t *softf = softc->ipf_frag_soft;;
|
|
|
|
#ifdef USE_MUTEXES
|
|
return ipf_frag_next(softc, token, itp, &softf->ipfr_natlist,
|
|
&softf->ipfr_natfrag);
|
|
#else
|
|
return ipf_frag_next(softc, token, itp, &softf->ipfr_natlist);
|
|
#endif
|
|
}
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
/* Function: ipf_frag_next */
|
|
/* Returns: int - 0 == success, else error */
|
|
/* Parameters: softc(I) - pointer to soft context main structure */
|
|
/* token(I) - pointer to token information for this caller */
|
|
/* itp(I) - pointer to generic iterator from caller */
|
|
/* top(I) - top of the fragment list */
|
|
/* lock(I) - fragment cache lock */
|
|
/* */
|
|
/* This function is used to interate through the list of entries in the */
|
|
/* fragment cache. It increases the reference count on the one currently */
|
|
/* being returned so that the caller can come back and resume from it later.*/
|
|
/* */
|
|
/* This function is used for both the NAT fragment cache as well as the ipf */
|
|
/* fragment cache - hence the reason for passing in top and lock. */
|
|
/* ------------------------------------------------------------------------ */
|
|
static int
|
|
ipf_frag_next(softc, token, itp, top
|
|
#ifdef USE_MUTEXES
|
|
, lock
|
|
#endif
|
|
)
|
|
ipf_main_softc_t *softc;
|
|
ipftoken_t *token;
|
|
ipfgeniter_t *itp;
|
|
ipfr_t **top;
|
|
#ifdef USE_MUTEXES
|
|
ipfrwlock_t *lock;
|
|
#endif
|
|
{
|
|
ipfr_t *frag, *next, zero;
|
|
int error = 0;
|
|
|
|
if (itp->igi_data == NULL) {
|
|
IPFERROR(20001);
|
|
return EFAULT;
|
|
}
|
|
|
|
if (itp->igi_nitems != 1) {
|
|
IPFERROR(20003);
|
|
return EFAULT;
|
|
}
|
|
|
|
frag = token->ipt_data;
|
|
|
|
READ_ENTER(lock);
|
|
|
|
if (frag == NULL)
|
|
next = *top;
|
|
else
|
|
next = frag->ipfr_next;
|
|
|
|
if (next != NULL) {
|
|
ATOMIC_INC(next->ipfr_ref);
|
|
token->ipt_data = next;
|
|
} else {
|
|
bzero(&zero, sizeof(zero));
|
|
next = &zero;
|
|
token->ipt_data = NULL;
|
|
}
|
|
if (next->ipfr_next == NULL)
|
|
ipf_token_mark_complete(token);
|
|
|
|
RWLOCK_EXIT(lock);
|
|
|
|
error = COPYOUT(next, itp->igi_data, sizeof(*next));
|
|
if (error != 0)
|
|
IPFERROR(20002);
|
|
|
|
if (frag != NULL) {
|
|
#ifdef USE_MUTEXES
|
|
ipf_frag_deref(softc, &frag, lock);
|
|
#else
|
|
ipf_frag_deref(softc, &frag);
|
|
#endif
|
|
}
|
|
return error;
|
|
}
|
|
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
/* Function: ipf_frag_pkt_deref */
|
|
/* Returns: Nil */
|
|
/* Parameters: softc(I) - pointer to soft context main structure */
|
|
/* data(I) - pointer to frag cache pointer */
|
|
/* */
|
|
/* This function is the external interface for dropping a reference to a */
|
|
/* fragment cache entry used by filter rules. */
|
|
/* ------------------------------------------------------------------------ */
|
|
void
|
|
ipf_frag_pkt_deref(softc, data)
|
|
ipf_main_softc_t *softc;
|
|
void *data;
|
|
{
|
|
ipfr_t **frp = data;
|
|
|
|
#ifdef USE_MUTEXES
|
|
ipf_frag_softc_t *softf = softc->ipf_frag_soft;
|
|
|
|
ipf_frag_deref(softc->ipf_frag_soft, frp, &softf->ipfr_frag);
|
|
#else
|
|
ipf_frag_deref(softc->ipf_frag_soft, frp);
|
|
#endif
|
|
}
|
|
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
/* Function: ipf_frag_nat_deref */
|
|
/* Returns: Nil */
|
|
/* Parameters: softc(I) - pointer to soft context main structure */
|
|
/* data(I) - pointer to frag cache pointer */
|
|
/* */
|
|
/* This function is the external interface for dropping a reference to a */
|
|
/* fragment cache entry used by NAT table entries. */
|
|
/* ------------------------------------------------------------------------ */
|
|
void
|
|
ipf_frag_nat_deref(softc, data)
|
|
ipf_main_softc_t *softc;
|
|
void *data;
|
|
{
|
|
ipfr_t **frp = data;
|
|
|
|
#ifdef USE_MUTEXES
|
|
ipf_frag_softc_t *softf = softc->ipf_frag_soft;
|
|
|
|
ipf_frag_deref(softc->ipf_frag_soft, frp, &softf->ipfr_natfrag);
|
|
#else
|
|
ipf_frag_deref(softc->ipf_frag_soft, frp);
|
|
#endif
|
|
}
|
|
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
/* Function: ipf_frag_deref */
|
|
/* Returns: Nil */
|
|
/* Parameters: frp(IO) - pointer to fragment structure to deference */
|
|
/* lock(I) - lock associated with the fragment */
|
|
/* */
|
|
/* This function dereferences a fragment structure (ipfr_t). The pointer */
|
|
/* passed in will always be reset back to NULL, even if the structure is */
|
|
/* not freed, to enforce the notion that the caller is no longer entitled */
|
|
/* to use the pointer it is dropping the reference to. */
|
|
/* ------------------------------------------------------------------------ */
|
|
static void
|
|
ipf_frag_deref(arg, frp
|
|
#ifdef USE_MUTEXES
|
|
, lock
|
|
#endif
|
|
)
|
|
void *arg;
|
|
ipfr_t **frp;
|
|
#ifdef USE_MUTEXES
|
|
ipfrwlock_t *lock;
|
|
#endif
|
|
{
|
|
ipf_frag_softc_t *softf = arg;
|
|
ipfr_t *fra;
|
|
|
|
fra = *frp;
|
|
*frp = NULL;
|
|
|
|
WRITE_ENTER(lock);
|
|
fra->ipfr_ref--;
|
|
if (fra->ipfr_ref <= 0)
|
|
ipf_frag_free(softf, fra);
|
|
RWLOCK_EXIT(lock);
|
|
}
|